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 // SPDX-License-Identifier: GPL-2.0-or-later
 /**************************************************************************/
 /*                                                                        */
 /*  IBM System i and System p Virtual NIC Device Driver                   */
 /*  Copyright (C) 2014 IBM Corp.                                          */
 /*  Santiago Leon (santi_leon@yahoo.com)                                  */
 /*  Thomas Falcon (tlfalcon@linux.vnet.ibm.com)                           */
 /*  John Allen (jallen@linux.vnet.ibm.com)                                */
 /*                                                                        */
 /*                                                                        */
 /* This module contains the implementation of a virtual ethernet device   */
 /* for use with IBM i/p Series LPAR Linux. It utilizes the logical LAN    */
 /* option of the RS/6000 Platform Architecture to interface with virtual  */
 /* ethernet NICs that are presented to the partition by the hypervisor.   */
 /*                                     */
 /* Messages are passed between the VNIC driver and the VNIC server using  */
 /* Command/Response Queues (CRQs) and sub CRQs (sCRQs). CRQs are used to  */
 /* issue and receive commands that initiate communication with the server */
 /* on driver initialization. Sub CRQs (sCRQs) are similar to CRQs, but    */
 /* are used by the driver to notify the server that a packet is           */
 /* ready for transmission or that a buffer has been added to receive a    */
 /* packet. Subsequently, sCRQs are used by the server to notify the       */
 /* driver that a packet transmission has been completed or that a packet  */
 /* has been received and placed in a waiting buffer.                      */
 /*                                                                        */
 /* In lieu of a more conventional "on-the-fly" DMA mapping strategy in    */
 /* which skbs are DMA mapped and immediately unmapped when the transmit   */
 /* or receive has been completed, the VNIC driver is required to use      */
 /* "long term mapping". This entails that large, continuous DMA mapped    */
 /* buffers are allocated on driver initialization and these buffers are   */
 /* then continuously reused to pass skbs to and from the VNIC server.     */
 /*                                                                        */
 /**************************************************************************/
 
 #include <linux/module.h>
 #include <linux/moduleparam.h>
 #include <linux/types.h>
 #include <linux/errno.h>
 #include <linux/completion.h>
 #include <linux/ioport.h>
 #include <linux/dma-mapping.h>
 #include <linux/kernel.h>
 #include <linux/netdevice.h>
 #include <linux/etherdevice.h>
 #include <linux/skbuff.h>
 #include <linux/init.h>
 #include <linux/delay.h>
 #include <linux/mm.h>
 #include <linux/ethtool.h>
 #include <linux/proc_fs.h>
 #include <linux/if_arp.h>
 #include <linux/in.h>
 #include <linux/ip.h>
 #include <linux/ipv6.h>
 #include <linux/irq.h>
 #include <linux/irqdomain.h>
 #include <linux/kthread.h>
 #include <linux/seq_file.h>
 #include <linux/interrupt.h>
 #include <net/net_namespace.h>
 #include <asm/hvcall.h>
 #include <linux/atomic.h>
 #include <asm/vio.h>
 #include <asm/xive.h>
 #include <asm/iommu.h>
 #include <linux/uaccess.h>
 #include <asm/firmware.h>
 #include <linux/workqueue.h>
 #include <linux/if_vlan.h>
 #include <linux/utsname.h>
 
 #include "ibmvnic.h"
 
 static const char ibmvnic_driver_name[] = "ibmvnic";
 static const char ibmvnic_driver_string[] = "IBM System i/p Virtual NIC Driver";
 
 MODULE_AUTHOR("Santiago Leon");
 MODULE_DESCRIPTION("IBM System i/p Virtual NIC Driver");
 MODULE_LICENSE("GPL");
 MODULE_VERSION(IBMVNIC_DRIVER_VERSION);
 
 static int ibmvnic_version = IBMVNIC_INITIAL_VERSION;
 static void release_sub_crqs(struct ibmvnic_adapter *, bool);
 static int ibmvnic_reset_crq(struct ibmvnic_adapter *);
 static int ibmvnic_send_crq_init(struct ibmvnic_adapter *);
 static int ibmvnic_reenable_crq_queue(struct ibmvnic_adapter *);
 static int ibmvnic_send_crq(struct ibmvnic_adapter *, union ibmvnic_crq *);
 static int send_subcrq_indirect(struct ibmvnic_adapter *, u64, u64, u64);
 static irqreturn_t ibmvnic_interrupt_rx(int irq, void *instance);
 static int enable_scrq_irq(struct ibmvnic_adapter *,
                struct ibmvnic_sub_crq_queue *);
 static int disable_scrq_irq(struct ibmvnic_adapter *,
                 struct ibmvnic_sub_crq_queue *);
 static int pending_scrq(struct ibmvnic_adapter *,
             struct ibmvnic_sub_crq_queue *);
 static union sub_crq *ibmvnic_next_scrq(struct ibmvnic_adapter *,
                     struct ibmvnic_sub_crq_queue *);
 static int ibmvnic_poll(struct napi_struct *napi, int data);
 static void send_query_map(struct ibmvnic_adapter *adapter);
 static int send_request_map(struct ibmvnic_adapter *, dma_addr_t, u32, u8);
 static int send_request_unmap(struct ibmvnic_adapter *, u8);
 static int send_login(struct ibmvnic_adapter *adapter);
 static void send_query_cap(struct ibmvnic_adapter *adapter);
 static int init_sub_crqs(struct ibmvnic_adapter *);
 static int init_sub_crq_irqs(struct ibmvnic_adapter *adapter);
 static int ibmvnic_reset_init(struct ibmvnic_adapter *, bool reset);
 static void release_crq_queue(struct ibmvnic_adapter *);
 static int __ibmvnic_set_mac(struct net_device *, u8 *);
 static int init_crq_queue(struct ibmvnic_adapter *adapter);
 static int send_query_phys_parms(struct ibmvnic_adapter *adapter);
 static void ibmvnic_tx_scrq_clean_buffer(struct ibmvnic_adapter *adapter,
                      struct ibmvnic_sub_crq_queue *tx_scrq);
 static void free_long_term_buff(struct ibmvnic_adapter *adapter,
                 struct ibmvnic_long_term_buff *ltb);
 static void ibmvnic_disable_irqs(struct ibmvnic_adapter *adapter);
 
 struct ibmvnic_stat {
     char name[ETH_GSTRING_LEN];
     int offset;
 };
 
 #define IBMVNIC_STAT_OFF(stat) (offsetof(struct ibmvnic_adapter, stats) + \
                  offsetof(struct ibmvnic_statistics, stat))
 #define IBMVNIC_GET_STAT(a, off) (*((u64 *)(((unsigned long)(a)) + (off))))
 
 static const struct ibmvnic_stat ibmvnic_stats[] = {
     {"rx_packets", IBMVNIC_STAT_OFF(rx_packets)},
     {"rx_bytes", IBMVNIC_STAT_OFF(rx_bytes)},
     {"tx_packets", IBMVNIC_STAT_OFF(tx_packets)},
     {"tx_bytes", IBMVNIC_STAT_OFF(tx_bytes)},
     {"ucast_tx_packets", IBMVNIC_STAT_OFF(ucast_tx_packets)},
     {"ucast_rx_packets", IBMVNIC_STAT_OFF(ucast_rx_packets)},
     {"mcast_tx_packets", IBMVNIC_STAT_OFF(mcast_tx_packets)},
     {"mcast_rx_packets", IBMVNIC_STAT_OFF(mcast_rx_packets)},
     {"bcast_tx_packets", IBMVNIC_STAT_OFF(bcast_tx_packets)},
     {"bcast_rx_packets", IBMVNIC_STAT_OFF(bcast_rx_packets)},
     {"align_errors", IBMVNIC_STAT_OFF(align_errors)},
     {"fcs_errors", IBMVNIC_STAT_OFF(fcs_errors)},
     {"single_collision_frames", IBMVNIC_STAT_OFF(single_collision_frames)},
     {"multi_collision_frames", IBMVNIC_STAT_OFF(multi_collision_frames)},
     {"sqe_test_errors", IBMVNIC_STAT_OFF(sqe_test_errors)},
     {"deferred_tx", IBMVNIC_STAT_OFF(deferred_tx)},
     {"late_collisions", IBMVNIC_STAT_OFF(late_collisions)},
     {"excess_collisions", IBMVNIC_STAT_OFF(excess_collisions)},
     {"internal_mac_tx_errors", IBMVNIC_STAT_OFF(internal_mac_tx_errors)},
     {"carrier_sense", IBMVNIC_STAT_OFF(carrier_sense)},
     {"too_long_frames", IBMVNIC_STAT_OFF(too_long_frames)},
     {"internal_mac_rx_errors", IBMVNIC_STAT_OFF(internal_mac_rx_errors)},
 };
 
 static int send_crq_init_complete(struct ibmvnic_adapter *adapter)
 {
     union ibmvnic_crq crq;
 
     memset(&crq, 0, sizeof(crq));
     crq.generic.first = IBMVNIC_CRQ_INIT_CMD;
     crq.generic.cmd = IBMVNIC_CRQ_INIT_COMPLETE;
 
     return ibmvnic_send_crq(adapter, &crq);
 }
 
 static int send_version_xchg(struct ibmvnic_adapter *adapter)
 {
     union ibmvnic_crq crq;
 
     memset(&crq, 0, sizeof(crq));
     crq.version_exchange.first = IBMVNIC_CRQ_CMD;
     crq.version_exchange.cmd = VERSION_EXCHANGE;
     crq.version_exchange.version = cpu_to_be16(ibmvnic_version);
 
     return ibmvnic_send_crq(adapter, &crq);
 }
 
 static long h_reg_sub_crq(unsigned long unit_address, unsigned long token,
               unsigned long length, unsigned long *number,
               unsigned long *irq)
 {
     unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
     long rc;
 
     rc = plpar_hcall(H_REG_SUB_CRQ, retbuf, unit_address, token, length);
     *number = retbuf[0];
     *irq = retbuf[1];
 
     return rc;
 }
 
 /**
  * ibmvnic_wait_for_completion - Check device state and wait for completion
  * @adapter: private device data
  * @comp_done: completion structure to wait for
  * @timeout: time to wait in milliseconds
  *
  * Wait for a completion signal or until the timeout limit is reached
  * while checking that the device is still active.
  */
 static int ibmvnic_wait_for_completion(struct ibmvnic_adapter *adapter,
                        struct completion *comp_done,
                        unsigned long timeout)
 {
     struct net_device *netdev;
     unsigned long div_timeout;
     u8 retry;
 
     netdev = adapter->netdev;
     retry = 5;
     div_timeout = msecs_to_jiffies(timeout / retry);
     while (true) {
         if (!adapter->crq.active) {
             netdev_err(netdev, "Device down!\n");
             return -ENODEV;
         }
         if (!retry--)
             break;
         if (wait_for_completion_timeout(comp_done, div_timeout))
             return 0;
     }
     netdev_err(netdev, "Operation timed out.\n");
     return -ETIMEDOUT;
 }
 
 /**
  * reuse_ltb() - Check if a long term buffer can be reused
  * @ltb:  The long term buffer to be checked
  * @size: The size of the long term buffer.
  *
  * An LTB can be reused unless its size has changed.
  *
  * Return: Return true if the LTB can be reused, false otherwise.
  */
 static bool reuse_ltb(struct ibmvnic_long_term_buff *ltb, int size)
 {
     return (ltb->buff && ltb->size == size);
 }
 
 /**
  * alloc_long_term_buff() - Allocate a long term buffer (LTB)
  *
  * @adapter: ibmvnic adapter associated to the LTB
  * @ltb:     container object for the LTB
  * @size:    size of the LTB
  *
  * Allocate an LTB of the specified size and notify VIOS.
  *
  * If the given @ltb already has the correct size, reuse it. Otherwise if
  * its non-NULL, free it. Then allocate a new one of the correct size.
  * Notify the VIOS either way since we may now be working with a new VIOS.
  *
  * Allocating larger chunks of memory during resets, specially LPM or under
  * low memory situations can cause resets to fail/timeout and for LPAR to
  * lose connectivity. So hold onto the LTB even if we fail to communicate
  * with the VIOS and reuse it on next open. Free LTB when adapter is closed.
  *
  * Return: 0 if we were able to allocate the LTB and notify the VIOS and
  *     a negative value otherwise.
  */
 static int alloc_long_term_buff(struct ibmvnic_adapter *adapter,
                 struct ibmvnic_long_term_buff *ltb, int size)
 {
     struct device *dev = &adapter->vdev->dev;
     u64 prev = 0;
     int rc;
 
     if (!reuse_ltb(ltb, size)) {
         dev_dbg(dev,
             "LTB size changed from 0x%llx to 0x%x, reallocating\n",
              ltb->size, size);
         prev = ltb->size;
         free_long_term_buff(adapter, ltb);
     }
 
     if (ltb->buff) {
         dev_dbg(dev, "Reusing LTB [map %d, size 0x%llx]\n",
             ltb->map_id, ltb->size);
     } else {
         ltb->buff = dma_alloc_coherent(dev, size, &ltb->addr,
                            GFP_KERNEL);
         if (!ltb->buff) {
             dev_err(dev, "Couldn't alloc long term buffer\n");
             return -ENOMEM;
         }
         ltb->size = size;
 
         ltb->map_id = find_first_zero_bit(adapter->map_ids,
                           MAX_MAP_ID);
         bitmap_set(adapter->map_ids, ltb->map_id, 1);
 
         dev_dbg(dev,
             "Allocated new LTB [map %d, size 0x%llx was 0x%llx]\n",
              ltb->map_id, ltb->size, prev);
     }
 
     /* Ensure ltb is zeroed - specially when reusing it. */
     memset(ltb->buff, 0, ltb->size);
 
     mutex_lock(&adapter->fw_lock);
     adapter->fw_done_rc = 0;
     reinit_completion(&adapter->fw_done);
 
     rc = send_request_map(adapter, ltb->addr, ltb->size, ltb->map_id);
     if (rc) {
         dev_err(dev, "send_request_map failed, rc = %d\n", rc);
         goto out;
     }
 
     rc = ibmvnic_wait_for_completion(adapter, &adapter->fw_done, 10000);
     if (rc) {
         dev_err(dev, "LTB map request aborted or timed out, rc = %d\n",
             rc);
         goto out;
     }
 
     if (adapter->fw_done_rc) {
         dev_err(dev, "Couldn't map LTB, rc = %d\n",
             adapter->fw_done_rc);
         rc = -EIO;
         goto out;
     }
     rc = 0;
 out:
     /* don't free LTB on communication error - see function header */
     mutex_unlock(&adapter->fw_lock);
     return rc;
 }
 
 static void free_long_term_buff(struct ibmvnic_adapter *adapter,
                 struct ibmvnic_long_term_buff *ltb)
 {
     struct device *dev = &adapter->vdev->dev;
 
     if (!ltb->buff)
         return;
 
     /* VIOS automatically unmaps the long term buffer at remote
      * end for the following resets:
      * FAILOVER, MOBILITY, TIMEOUT.
      */
     if (adapter->reset_reason != VNIC_RESET_FAILOVER &&
         adapter->reset_reason != VNIC_RESET_MOBILITY &&
         adapter->reset_reason != VNIC_RESET_TIMEOUT)
         send_request_unmap(adapter, ltb->map_id);
 
     dma_free_coherent(dev, ltb->size, ltb->buff, ltb->addr);
 
     ltb->buff = NULL;
     /* mark this map_id free */
     bitmap_clear(adapter->map_ids, ltb->map_id, 1);
     ltb->map_id = 0;
 }
 
 /**
  * free_ltb_set - free the given set of long term buffers (LTBS)
  * @adapter: The ibmvnic adapter containing this ltb set
  * @ltb_set: The ltb_set to be freed
  *
  * Free the set of LTBs in the given set.
  */
 
 static void free_ltb_set(struct ibmvnic_adapter *adapter,
              struct ibmvnic_ltb_set *ltb_set)
 {
     int i;
 
     for (i = 0; i < ltb_set->num_ltbs; i++)
         free_long_term_buff(adapter, &ltb_set->ltbs[i]);
 
     kfree(ltb_set->ltbs);
     ltb_set->ltbs = NULL;
     ltb_set->num_ltbs = 0;
 }
 
 /**
  * alloc_ltb_set() - Allocate a set of long term buffers (LTBs)
  *
  * @adapter: ibmvnic adapter associated to the LTB
  * @ltb_set: container object for the set of LTBs
  * @num_buffs: Number of buffers in the LTB
  * @buff_size: Size of each buffer in the LTB
  *
  * Allocate a set of LTBs to accommodate @num_buffs buffers of @buff_size
  * each. We currently cap size each LTB to IBMVNIC_ONE_LTB_SIZE. If the
  * new set of LTBs have fewer LTBs than the old set, free the excess LTBs.
  * If new set needs more than in old set, allocate the remaining ones.
  * Try and reuse as many LTBs as possible and avoid reallocation.
  *
  * Any changes to this allocation strategy must be reflected in
  * map_rxpool_buff_to_ltb() and map_txpool_buff_to_ltb().
  */
 static int alloc_ltb_set(struct ibmvnic_adapter *adapter,
              struct ibmvnic_ltb_set *ltb_set, int num_buffs,
              int buff_size)
 {
     struct device *dev = &adapter->vdev->dev;
     struct ibmvnic_ltb_set old_set;
     struct ibmvnic_ltb_set new_set;
     int rem_size;
     int tot_size;       /* size of all ltbs */
     int ltb_size;       /* size of one ltb */
     int nltbs;
     int rc;
     int n;
     int i;
 
     dev_dbg(dev, "%s() num_buffs %d, buff_size %d\n", __func__, num_buffs,
         buff_size);
 
     ltb_size = rounddown(IBMVNIC_ONE_LTB_SIZE, buff_size);
     tot_size = num_buffs * buff_size;
 
     if (ltb_size > tot_size)
         ltb_size = tot_size;
 
     nltbs = tot_size / ltb_size;
     if (tot_size % ltb_size)
         nltbs++;
 
     old_set = *ltb_set;
 
     if (old_set.num_ltbs == nltbs) {
         new_set = old_set;
     } else {
         int tmp = nltbs * sizeof(struct ibmvnic_long_term_buff);
 
         new_set.ltbs = kzalloc(tmp, GFP_KERNEL);
         if (!new_set.ltbs)
             return -ENOMEM;
 
         new_set.num_ltbs = nltbs;
 
         /* Free any excess ltbs in old set */
         for (i = new_set.num_ltbs; i < old_set.num_ltbs; i++)
             free_long_term_buff(adapter, &old_set.ltbs[i]);
 
         /* Copy remaining ltbs to new set. All LTBs except the
          * last one are of the same size. alloc_long_term_buff()
          * will realloc if the size changes.
          */
         n = min(old_set.num_ltbs, new_set.num_ltbs);
         for (i = 0; i < n; i++)
             new_set.ltbs[i] = old_set.ltbs[i];
 
         /* Any additional ltbs in new set will have NULL ltbs for
          * now and will be allocated in alloc_long_term_buff().
          */
 
         /* We no longer need the old_set so free it. Note that we
          * may have reused some ltbs from old set and freed excess
          * ltbs above. So we only need to free the container now
          * not the LTBs themselves. (i.e. dont free_ltb_set()!)
          */
         kfree(old_set.ltbs);
         old_set.ltbs = NULL;
         old_set.num_ltbs = 0;
 
         /* Install the new set. If allocations fail below, we will
          * retry later and know what size LTBs we need.
          */
         *ltb_set = new_set;
     }
 
     i = 0;
     rem_size = tot_size;
     while (rem_size) {
         if (ltb_size > rem_size)
             ltb_size = rem_size;
 
         rem_size -= ltb_size;
 
         rc = alloc_long_term_buff(adapter, &new_set.ltbs[i], ltb_size);
         if (rc)
             goto out;
         i++;
     }
 
     WARN_ON(i != new_set.num_ltbs);
 
     return 0;
 out:
     /* We may have allocated one/more LTBs before failing and we
      * want to try and reuse on next reset. So don't free ltb set.
      */
     return rc;
 }
 
 /**
  * map_rxpool_buf_to_ltb - Map given rxpool buffer to offset in an LTB.
  * @rxpool: The receive buffer pool containing buffer
  * @bufidx: Index of buffer in rxpool
  * @ltbp: (Output) pointer to the long term buffer containing the buffer
  * @offset: (Output) offset of buffer in the LTB from @ltbp
  *
  * Map the given buffer identified by [rxpool, bufidx] to an LTB in the
  * pool and its corresponding offset. Assume for now that each LTB is of
  * different size but could possibly be optimized based on the allocation
  * strategy in alloc_ltb_set().
  */
 static void map_rxpool_buf_to_ltb(struct ibmvnic_rx_pool *rxpool,
                   unsigned int bufidx,
                   struct ibmvnic_long_term_buff **ltbp,
                   unsigned int *offset)
 {
     struct ibmvnic_long_term_buff *ltb;
     int nbufs;  /* # of buffers in one ltb */
     int i;
 
     WARN_ON(bufidx >= rxpool->size);
 
     for (i = 0; i < rxpool->ltb_set.num_ltbs; i++) {
         ltb = &rxpool->ltb_set.ltbs[i];
         nbufs = ltb->size / rxpool->buff_size;
         if (bufidx < nbufs)
             break;
         bufidx -= nbufs;
     }
 
     *ltbp = ltb;
     *offset = bufidx * rxpool->buff_size;
 }
 
 /**
  * map_txpool_buf_to_ltb - Map given txpool buffer to offset in an LTB.
  * @txpool: The transmit buffer pool containing buffer
  * @bufidx: Index of buffer in txpool
  * @ltbp: (Output) pointer to the long term buffer (LTB) containing the buffer
  * @offset: (Output) offset of buffer in the LTB from @ltbp
  *
  * Map the given buffer identified by [txpool, bufidx] to an LTB in the
  * pool and its corresponding offset.
  */
 static void map_txpool_buf_to_ltb(struct ibmvnic_tx_pool *txpool,
                   unsigned int bufidx,
                   struct ibmvnic_long_term_buff **ltbp,
                   unsigned int *offset)
 {
     struct ibmvnic_long_term_buff *ltb;
     int nbufs;  /* # of buffers in one ltb */
     int i;
 
     WARN_ON_ONCE(bufidx >= txpool->num_buffers);
 
     for (i = 0; i < txpool->ltb_set.num_ltbs; i++) {
         ltb = &txpool->ltb_set.ltbs[i];
         nbufs = ltb->size / txpool->buf_size;
         if (bufidx < nbufs)
             break;
         bufidx -= nbufs;
     }
 
     *ltbp = ltb;
     *offset = bufidx * txpool->buf_size;
 }
 
 static void deactivate_rx_pools(struct ibmvnic_adapter *adapter)
 {
     int i;
 
     for (i = 0; i < adapter->num_active_rx_pools; i++)
         adapter->rx_pool[i].active = 0;
 }
 
 static void replenish_rx_pool(struct ibmvnic_adapter *adapter,
                   struct ibmvnic_rx_pool *pool)
 {
     int count = pool->size - atomic_read(&pool->available);
     u64 handle = adapter->rx_scrq[pool->index]->handle;
     struct device *dev = &adapter->vdev->dev;
     struct ibmvnic_ind_xmit_queue *ind_bufp;
     struct ibmvnic_sub_crq_queue *rx_scrq;
     struct ibmvnic_long_term_buff *ltb;
     union sub_crq *sub_crq;
     int buffers_added = 0;
     unsigned long lpar_rc;
     struct sk_buff *skb;
     unsigned int offset;
     dma_addr_t dma_addr;
     unsigned char *dst;
     int shift = 0;
     int bufidx;
     int i;
 
     if (!pool->active)
         return;
 
     rx_scrq = adapter->rx_scrq[pool->index];
     ind_bufp = &rx_scrq->ind_buf;
 
     /* netdev_skb_alloc() could have failed after we saved a few skbs
      * in the indir_buf and we would not have sent them to VIOS yet.
      * To account for them, start the loop at ind_bufp->index rather
      * than 0. If we pushed all the skbs to VIOS, ind_bufp->index will
      * be 0.
      */
     for (i = ind_bufp->index; i < count; ++i) {
         bufidx = pool->free_map[pool->next_free];
 
         /* We maybe reusing the skb from earlier resets. Allocate
          * only if necessary. But since the LTB may have changed
          * during reset (see init_rx_pools()), update LTB below
          * even if reusing skb.
          */
         skb = pool->rx_buff[bufidx].skb;
         if (!skb) {
             skb = netdev_alloc_skb(adapter->netdev,
                            pool->buff_size);
             if (!skb) {
                 dev_err(dev, "Couldn't replenish rx buff\n");
                 adapter->replenish_no_mem++;
                 break;
             }
         }
 
         pool->free_map[pool->next_free] = IBMVNIC_INVALID_MAP;
         pool->next_free = (pool->next_free + 1) % pool->size;
 
         /* Copy the skb to the long term mapped DMA buffer */
         map_rxpool_buf_to_ltb(pool, bufidx, &ltb, &offset);
         dst = ltb->buff + offset;
         memset(dst, 0, pool->buff_size);
         dma_addr = ltb->addr + offset;
 
         /* add the skb to an rx_buff in the pool */
         pool->rx_buff[bufidx].data = dst;
         pool->rx_buff[bufidx].dma = dma_addr;
         pool->rx_buff[bufidx].skb = skb;
         pool->rx_buff[bufidx].pool_index = pool->index;
         pool->rx_buff[bufidx].size = pool->buff_size;
 
         /* queue the rx_buff for the next send_subcrq_indirect */
         sub_crq = &ind_bufp->indir_arr[ind_bufp->index++];
         memset(sub_crq, 0, sizeof(*sub_crq));
         sub_crq->rx_add.first = IBMVNIC_CRQ_CMD;
         sub_crq->rx_add.correlator =
             cpu_to_be64((u64)&pool->rx_buff[bufidx]);
         sub_crq->rx_add.ioba = cpu_to_be32(dma_addr);
         sub_crq->rx_add.map_id = ltb->map_id;
 
         /* The length field of the sCRQ is defined to be 24 bits so the
          * buffer size needs to be left shifted by a byte before it is
          * converted to big endian to prevent the last byte from being
          * truncated.
          */
 #ifdef __LITTLE_ENDIAN__
         shift = 8;
 #endif
         sub_crq->rx_add.len = cpu_to_be32(pool->buff_size << shift);
 
         /* if send_subcrq_indirect queue is full, flush to VIOS */
         if (ind_bufp->index == IBMVNIC_MAX_IND_DESCS ||
             i == count - 1) {
             lpar_rc =
                 send_subcrq_indirect(adapter, handle,
                              (u64)ind_bufp->indir_dma,
                              (u64)ind_bufp->index);
             if (lpar_rc != H_SUCCESS)
                 goto failure;
             buffers_added += ind_bufp->index;
             adapter->replenish_add_buff_success += ind_bufp->index;
             ind_bufp->index = 0;
         }
     }
     atomic_add(buffers_added, &pool->available);
     return;
 
 failure:
     if (lpar_rc != H_PARAMETER && lpar_rc != H_CLOSED)
         dev_err_ratelimited(dev, "rx: replenish packet buffer failed\n");
     for (i = ind_bufp->index - 1; i >= 0; --i) {
         struct ibmvnic_rx_buff *rx_buff;
 
         pool->next_free = pool->next_free == 0 ?
                   pool->size - 1 : pool->next_free - 1;
         sub_crq = &ind_bufp->indir_arr[i];
         rx_buff = (struct ibmvnic_rx_buff *)
                 be64_to_cpu(sub_crq->rx_add.correlator);
         bufidx = (int)(rx_buff - pool->rx_buff);
         pool->free_map[pool->next_free] = bufidx;
         dev_kfree_skb_any(pool->rx_buff[bufidx].skb);
         pool->rx_buff[bufidx].skb = NULL;
     }
     adapter->replenish_add_buff_failure += ind_bufp->index;
     atomic_add(buffers_added, &pool->available);
     ind_bufp->index = 0;
     if (lpar_rc == H_CLOSED || adapter->failover_pending) {
         /* Disable buffer pool replenishment and report carrier off if
          * queue is closed or pending failover.
          * Firmware guarantees that a signal will be sent to the
          * driver, triggering a reset.
          */
         deactivate_rx_pools(adapter);
         netif_carrier_off(adapter->netdev);
     }
 }
 
 static void replenish_pools(struct ibmvnic_adapter *adapter)
 {
     int i;
 
     adapter->replenish_task_cycles++;
     for (i = 0; i < adapter->num_active_rx_pools; i++) {
         if (adapter->rx_pool[i].active)
             replenish_rx_pool(adapter, &adapter->rx_pool[i]);
     }
 
     netdev_dbg(adapter->netdev, "Replenished %d pools\n", i);
 }
 
 static void release_stats_buffers(struct ibmvnic_adapter *adapter)
 {
     kfree(adapter->tx_stats_buffers);
     kfree(adapter->rx_stats_buffers);
     adapter->tx_stats_buffers = NULL;
     adapter->rx_stats_buffers = NULL;
 }
 
 static int init_stats_buffers(struct ibmvnic_adapter *adapter)
 {
     adapter->tx_stats_buffers =
                 kcalloc(IBMVNIC_MAX_QUEUES,
                     sizeof(struct ibmvnic_tx_queue_stats),
                     GFP_KERNEL);
     if (!adapter->tx_stats_buffers)
         return -ENOMEM;
 
     adapter->rx_stats_buffers =
                 kcalloc(IBMVNIC_MAX_QUEUES,
                     sizeof(struct ibmvnic_rx_queue_stats),
                     GFP_KERNEL);
     if (!adapter->rx_stats_buffers)
         return -ENOMEM;
 
     return 0;
 }
 
 static void release_stats_token(struct ibmvnic_adapter *adapter)
 {
     struct device *dev = &adapter->vdev->dev;
 
     if (!adapter->stats_token)
         return;
 
     dma_unmap_single(dev, adapter->stats_token,
              sizeof(struct ibmvnic_statistics),
              DMA_FROM_DEVICE);
     adapter->stats_token = 0;
 }
 
 static int init_stats_token(struct ibmvnic_adapter *adapter)
 {
     struct device *dev = &adapter->vdev->dev;
     dma_addr_t stok;
     int rc;
 
     stok = dma_map_single(dev, &adapter->stats,
                   sizeof(struct ibmvnic_statistics),
                   DMA_FROM_DEVICE);
     rc = dma_mapping_error(dev, stok);
     if (rc) {
         dev_err(dev, "Couldn't map stats buffer, rc = %d\n", rc);
         return rc;
     }
 
     adapter->stats_token = stok;
     netdev_dbg(adapter->netdev, "Stats token initialized (%llx)\n", stok);
     return 0;
 }
 
 /**
  * release_rx_pools() - Release any rx pools attached to @adapter.
  * @adapter: ibmvnic adapter
  *
  * Safe to call this multiple times - even if no pools are attached.
  */
 static void release_rx_pools(struct ibmvnic_adapter *adapter)
 {
     struct ibmvnic_rx_pool *rx_pool;
     int i, j;
 
     if (!adapter->rx_pool)
         return;
 
     for (i = 0; i < adapter->num_active_rx_pools; i++) {
         rx_pool = &adapter->rx_pool[i];
 
         netdev_dbg(adapter->netdev, "Releasing rx_pool[%d]\n", i);
 
         kfree(rx_pool->free_map);
 
         free_ltb_set(adapter, &rx_pool->ltb_set);
 
         if (!rx_pool->rx_buff)
             continue;
 
         for (j = 0; j < rx_pool->size; j++) {
             if (rx_pool->rx_buff[j].skb) {
                 dev_kfree_skb_any(rx_pool->rx_buff[j].skb);
                 rx_pool->rx_buff[j].skb = NULL;
             }
         }
 
         kfree(rx_pool->rx_buff);
     }
 
     kfree(adapter->rx_pool);
     adapter->rx_pool = NULL;
     adapter->num_active_rx_pools = 0;
     adapter->prev_rx_pool_size = 0;
 }
 
 /**
  * reuse_rx_pools() - Check if the existing rx pools can be reused.
  * @adapter: ibmvnic adapter
  *
  * Check if the existing rx pools in the adapter can be reused. The
  * pools can be reused if the pool parameters (number of pools,
  * number of buffers in the pool and size of each buffer) have not
  * changed.
  *
  * NOTE: This assumes that all pools have the same number of buffers
  *       which is the case currently. If that changes, we must fix this.
  *
  * Return: true if the rx pools can be reused, false otherwise.
  */
 static bool reuse_rx_pools(struct ibmvnic_adapter *adapter)
 {
     u64 old_num_pools, new_num_pools;
     u64 old_pool_size, new_pool_size;
     u64 old_buff_size, new_buff_size;
 
     if (!adapter->rx_pool)
         return false;
 
     old_num_pools = adapter->num_active_rx_pools;
     new_num_pools = adapter->req_rx_queues;
 
     old_pool_size = adapter->prev_rx_pool_size;
     new_pool_size = adapter->req_rx_add_entries_per_subcrq;
 
     old_buff_size = adapter->prev_rx_buf_sz;
     new_buff_size = adapter->cur_rx_buf_sz;
 
     if (old_buff_size != new_buff_size ||
         old_num_pools != new_num_pools ||
         old_pool_size != new_pool_size)
         return false;
 
     return true;
 }
 
 /**
  * init_rx_pools(): Initialize the set of receiver pools in the adapter.
  * @netdev: net device associated with the vnic interface
  *
  * Initialize the set of receiver pools in the ibmvnic adapter associated
  * with the net_device @netdev. If possible, reuse the existing rx pools.
  * Otherwise free any existing pools and  allocate a new set of pools
  * before initializing them.
  *
  * Return: 0 on success and negative value on error.
  */
 static int init_rx_pools(struct net_device *netdev)
 {
     struct ibmvnic_adapter *adapter = netdev_priv(netdev);
     struct device *dev = &adapter->vdev->dev;
     struct ibmvnic_rx_pool *rx_pool;
     u64 num_pools;
     u64 pool_size;      /* # of buffers in one pool */
     u64 buff_size;
     int i, j, rc;
 
     pool_size = adapter->req_rx_add_entries_per_subcrq;
     num_pools = adapter->req_rx_queues;
     buff_size = adapter->cur_rx_buf_sz;
 
     if (reuse_rx_pools(adapter)) {
         dev_dbg(dev, "Reusing rx pools\n");
         goto update_ltb;
     }
 
     /* Allocate/populate the pools. */
     release_rx_pools(adapter);
 
     adapter->rx_pool = kcalloc(num_pools,
                    sizeof(struct ibmvnic_rx_pool),
                    GFP_KERNEL);
     if (!adapter->rx_pool) {
         dev_err(dev, "Failed to allocate rx pools\n");
         return -ENOMEM;
     }
 
     /* Set num_active_rx_pools early. If we fail below after partial
      * allocation, release_rx_pools() will know how many to look for.
      */
     adapter->num_active_rx_pools = num_pools;
 
     for (i = 0; i < num_pools; i++) {
         rx_pool = &adapter->rx_pool[i];
 
         netdev_dbg(adapter->netdev,
                "Initializing rx_pool[%d], %lld buffs, %lld bytes each\n",
                i, pool_size, buff_size);
 
         rx_pool->size = pool_size;
         rx_pool->index = i;
         rx_pool->buff_size = ALIGN(buff_size, L1_CACHE_BYTES);
 
         rx_pool->free_map = kcalloc(rx_pool->size, sizeof(int),
                         GFP_KERNEL);
         if (!rx_pool->free_map) {
             dev_err(dev, "Couldn't alloc free_map %d\n", i);
             rc = -ENOMEM;
             goto out_release;
         }
 
         rx_pool->rx_buff = kcalloc(rx_pool->size,
                        sizeof(struct ibmvnic_rx_buff),
                        GFP_KERNEL);
         if (!rx_pool->rx_buff) {
             dev_err(dev, "Couldn't alloc rx buffers\n");
             rc = -ENOMEM;
             goto out_release;
         }
     }
 
     adapter->prev_rx_pool_size = pool_size;
     adapter->prev_rx_buf_sz = adapter->cur_rx_buf_sz;
 
 update_ltb:
     for (i = 0; i < num_pools; i++) {
         rx_pool = &adapter->rx_pool[i];
         dev_dbg(dev, "Updating LTB for rx pool %d [%d, %d]\n",
             i, rx_pool->size, rx_pool->buff_size);
 
         rc = alloc_ltb_set(adapter, &rx_pool->ltb_set,
                    rx_pool->size, rx_pool->buff_size);
         if (rc)
             goto out;
 
         for (j = 0; j < rx_pool->size; ++j) {
             struct ibmvnic_rx_buff *rx_buff;
 
             rx_pool->free_map[j] = j;
 
             /* NOTE: Don't clear rx_buff->skb here - will leak
              * memory! replenish_rx_pool() will reuse skbs or
              * allocate as necessary.
              */
             rx_buff = &rx_pool->rx_buff[j];
             rx_buff->dma = 0;
             rx_buff->data = 0;
             rx_buff->size = 0;
             rx_buff->pool_index = 0;
         }
 
         /* Mark pool "empty" so replenish_rx_pools() will
          * update the LTB info for each buffer
          */
         atomic_set(&rx_pool->available, 0);
         rx_pool->next_alloc = 0;
         rx_pool->next_free = 0;
         /* replenish_rx_pool() may have called deactivate_rx_pools()
          * on failover. Ensure pool is active now.
          */
         rx_pool->active = 1;
     }
     return 0;
 out_release:
     release_rx_pools(adapter);
 out:
     /* We failed to allocate one or more LTBs or map them on the VIOS.
      * Hold onto the pools and any LTBs that we did allocate/map.
      */
     return rc;
 }
 
 static void release_vpd_data(struct ibmvnic_adapter *adapter)
 {
     if (!adapter->vpd)
         return;
 
     kfree(adapter->vpd->buff);
     kfree(adapter->vpd);
 
     adapter->vpd = NULL;
 }
 
 static void release_one_tx_pool(struct ibmvnic_adapter *adapter,
                 struct ibmvnic_tx_pool *tx_pool)
 {
     kfree(tx_pool->tx_buff);
     kfree(tx_pool->free_map);
     free_ltb_set(adapter, &tx_pool->ltb_set);
 }
 
 /**
  * release_tx_pools() - Release any tx pools attached to @adapter.
  * @adapter: ibmvnic adapter
  *
  * Safe to call this multiple times - even if no pools are attached.
  */
 static void release_tx_pools(struct ibmvnic_adapter *adapter)
 {
     int i;
 
     /* init_tx_pools() ensures that ->tx_pool and ->tso_pool are
      * both NULL or both non-NULL. So we only need to check one.
      */
     if (!adapter->tx_pool)
         return;
 
     for (i = 0; i < adapter->num_active_tx_pools; i++) {
         release_one_tx_pool(adapter, &adapter->tx_pool[i]);
         release_one_tx_pool(adapter, &adapter->tso_pool[i]);
     }
 
     kfree(adapter->tx_pool);
     adapter->tx_pool = NULL;
     kfree(adapter->tso_pool);
     adapter->tso_pool = NULL;
     adapter->num_active_tx_pools = 0;
     adapter->prev_tx_pool_size = 0;
 }
 
 static int init_one_tx_pool(struct net_device *netdev,
                 struct ibmvnic_tx_pool *tx_pool,
                 int pool_size, int buf_size)
 {
     int i;
 
     tx_pool->tx_buff = kcalloc(pool_size,
                    sizeof(struct ibmvnic_tx_buff),
                    GFP_KERNEL);
     if (!tx_pool->tx_buff)
         return -ENOMEM;
 
     tx_pool->free_map = kcalloc(pool_size, sizeof(int), GFP_KERNEL);
     if (!tx_pool->free_map) {
         kfree(tx_pool->tx_buff);
         tx_pool->tx_buff = NULL;
         return -ENOMEM;
     }
 
     for (i = 0; i < pool_size; i++)
         tx_pool->free_map[i] = i;
 
     tx_pool->consumer_index = 0;
     tx_pool->producer_index = 0;
     tx_pool->num_buffers = pool_size;
     tx_pool->buf_size = buf_size;
 
     return 0;
 }
 
 /**
  * reuse_tx_pools() - Check if the existing tx pools can be reused.
  * @adapter: ibmvnic adapter
  *
  * Check if the existing tx pools in the adapter can be reused. The
  * pools can be reused if the pool parameters (number of pools,
  * number of buffers in the pool and mtu) have not changed.
  *
  * NOTE: This assumes that all pools have the same number of buffers
  *       which is the case currently. If that changes, we must fix this.
  *
  * Return: true if the tx pools can be reused, false otherwise.
  */
 static bool reuse_tx_pools(struct ibmvnic_adapter *adapter)
 {
     u64 old_num_pools, new_num_pools;
     u64 old_pool_size, new_pool_size;
     u64 old_mtu, new_mtu;
 
     if (!adapter->tx_pool)
         return false;
 
     old_num_pools = adapter->num_active_tx_pools;
     new_num_pools = adapter->num_active_tx_scrqs;
     old_pool_size = adapter->prev_tx_pool_size;
     new_pool_size = adapter->req_tx_entries_per_subcrq;
     old_mtu = adapter->prev_mtu;
     new_mtu = adapter->req_mtu;
 
     if (old_mtu != new_mtu ||
         old_num_pools != new_num_pools ||
         old_pool_size != new_pool_size)
         return false;
 
     return true;
 }
 
 /**
  * init_tx_pools(): Initialize the set of transmit pools in the adapter.
  * @netdev: net device associated with the vnic interface
  *
  * Initialize the set of transmit pools in the ibmvnic adapter associated
  * with the net_device @netdev. If possible, reuse the existing tx pools.
  * Otherwise free any existing pools and  allocate a new set of pools
  * before initializing them.
  *
  * Return: 0 on success and negative value on error.
  */
 static int init_tx_pools(struct net_device *netdev)
 {
     struct ibmvnic_adapter *adapter = netdev_priv(netdev);
     struct device *dev = &adapter->vdev->dev;
     int num_pools;
     u64 pool_size;      /* # of buffers in pool */
     u64 buff_size;
     int i, j, rc;
 
     num_pools = adapter->req_tx_queues;
 
     /* We must notify the VIOS about the LTB on all resets - but we only
      * need to alloc/populate pools if either the number of buffers or
      * size of each buffer in the pool has changed.
      */
     if (reuse_tx_pools(adapter)) {
         netdev_dbg(netdev, "Reusing tx pools\n");
         goto update_ltb;
     }
 
     /* Allocate/populate the pools. */
     release_tx_pools(adapter);
 
     pool_size = adapter->req_tx_entries_per_subcrq;
     num_pools = adapter->num_active_tx_scrqs;
 
     adapter->tx_pool = kcalloc(num_pools,
                    sizeof(struct ibmvnic_tx_pool), GFP_KERNEL);
     if (!adapter->tx_pool)
         return -ENOMEM;
 
     adapter->tso_pool = kcalloc(num_pools,
                     sizeof(struct ibmvnic_tx_pool), GFP_KERNEL);
     /* To simplify release_tx_pools() ensure that ->tx_pool and
      * ->tso_pool are either both NULL or both non-NULL.
      */
     if (!adapter->tso_pool) {
         kfree(adapter->tx_pool);
         adapter->tx_pool = NULL;
         return -ENOMEM;
     }
 
     /* Set num_active_tx_pools early. If we fail below after partial
      * allocation, release_tx_pools() will know how many to look for.
      */
     adapter->num_active_tx_pools = num_pools;
 
     buff_size = adapter->req_mtu + VLAN_HLEN;
     buff_size = ALIGN(buff_size, L1_CACHE_BYTES);
 
     for (i = 0; i < num_pools; i++) {
         dev_dbg(dev, "Init tx pool %d [%llu, %llu]\n",
             i, adapter->req_tx_entries_per_subcrq, buff_size);
 
         rc = init_one_tx_pool(netdev, &adapter->tx_pool[i],
                       pool_size, buff_size);
         if (rc)
             goto out_release;
 
         rc = init_one_tx_pool(netdev, &adapter->tso_pool[i],
                       IBMVNIC_TSO_BUFS,
                       IBMVNIC_TSO_BUF_SZ);
         if (rc)
             goto out_release;
     }
 
     adapter->prev_tx_pool_size = pool_size;
     adapter->prev_mtu = adapter->req_mtu;
 
 update_ltb:
     /* NOTE: All tx_pools have the same number of buffers (which is
      *       same as pool_size). All tso_pools have IBMVNIC_TSO_BUFS
      *       buffers (see calls init_one_tx_pool() for these).
      *       For consistency, we use tx_pool->num_buffers and
      *       tso_pool->num_buffers below.
      */
     rc = -1;
     for (i = 0; i < num_pools; i++) {
         struct ibmvnic_tx_pool *tso_pool;
         struct ibmvnic_tx_pool *tx_pool;
 
         tx_pool = &adapter->tx_pool[i];
 
         dev_dbg(dev, "Updating LTB for tx pool %d [%d, %d]\n",
             i, tx_pool->num_buffers, tx_pool->buf_size);
 
         rc = alloc_ltb_set(adapter, &tx_pool->ltb_set,
                    tx_pool->num_buffers, tx_pool->buf_size);
         if (rc)
             goto out;
 
         tx_pool->consumer_index = 0;
         tx_pool->producer_index = 0;
 
         for (j = 0; j < tx_pool->num_buffers; j++)
             tx_pool->free_map[j] = j;
 
         tso_pool = &adapter->tso_pool[i];
 
         dev_dbg(dev, "Updating LTB for tso pool %d [%d, %d]\n",
             i, tso_pool->num_buffers, tso_pool->buf_size);
 
         rc = alloc_ltb_set(adapter, &tso_pool->ltb_set,
                    tso_pool->num_buffers, tso_pool->buf_size);
         if (rc)
             goto out;
 
         tso_pool->consumer_index = 0;
         tso_pool->producer_index = 0;
 
         for (j = 0; j < tso_pool->num_buffers; j++)
             tso_pool->free_map[j] = j;
     }
 
     return 0;
 out_release:
     release_tx_pools(adapter);
 out:
     /* We failed to allocate one or more LTBs or map them on the VIOS.
      * Hold onto the pools and any LTBs that we did allocate/map.
      */
     return rc;
 }
 
 static void ibmvnic_napi_enable(struct ibmvnic_adapter *adapter)
 {
     int i;
 
     if (adapter->napi_enabled)
         return;
 
     for (i = 0; i < adapter->req_rx_queues; i++)
         napi_enable(&adapter->napi[i]);
 
     adapter->napi_enabled = true;
 }
 
 static void ibmvnic_napi_disable(struct ibmvnic_adapter *adapter)
 {
     int i;
 
     if (!adapter->napi_enabled)
         return;
 
     for (i = 0; i < adapter->req_rx_queues; i++) {
         netdev_dbg(adapter->netdev, "Disabling napi[%d]\n", i);
         napi_disable(&adapter->napi[i]);
     }
 
     adapter->napi_enabled = false;
 }
 
 static int init_napi(struct ibmvnic_adapter *adapter)
 {
     int i;
 
     adapter->napi = kcalloc(adapter->req_rx_queues,
                 sizeof(struct napi_struct), GFP_KERNEL);
     if (!adapter->napi)
         return -ENOMEM;
 
     for (i = 0; i < adapter->req_rx_queues; i++) {
         netdev_dbg(adapter->netdev, "Adding napi[%d]\n", i);
         netif_napi_add(adapter->netdev, &adapter->napi[i],
                    ibmvnic_poll, NAPI_POLL_WEIGHT);
     }
 
     adapter->num_active_rx_napi = adapter->req_rx_queues;
     return 0;
 }
 
 static void release_napi(struct ibmvnic_adapter *adapter)
 {
     int i;
 
     if (!adapter->napi)
         return;
 
     for (i = 0; i < adapter->num_active_rx_napi; i++) {
         netdev_dbg(adapter->netdev, "Releasing napi[%d]\n", i);
         netif_napi_del(&adapter->napi[i]);
     }
 
     kfree(adapter->napi);
     adapter->napi = NULL;
     adapter->num_active_rx_napi = 0;
     adapter->napi_enabled = false;
 }
 
 static const char *adapter_state_to_string(enum vnic_state state)
 {
     switch (state) {
     case VNIC_PROBING:
         return "PROBING";
     case VNIC_PROBED:
         return "PROBED";
     case VNIC_OPENING:
         return "OPENING";
     case VNIC_OPEN:
         return "OPEN";
     case VNIC_CLOSING:
         return "CLOSING";
     case VNIC_CLOSED:
         return "CLOSED";
     case VNIC_REMOVING:
         return "REMOVING";
     case VNIC_REMOVED:
         return "REMOVED";
     case VNIC_DOWN:
         return "DOWN";
     }
     return "UNKNOWN";
 }
 
 static int ibmvnic_login(struct net_device *netdev)
 {
     struct ibmvnic_adapter *adapter = netdev_priv(netdev);
     unsigned long timeout = msecs_to_jiffies(20000);
     int retry_count = 0;
     int retries = 10;
     bool retry;
     int rc;
 
     do {
         retry = false;
         if (retry_count > retries) {
             netdev_warn(netdev, "Login attempts exceeded\n");
             return -EACCES;
         }
 
         adapter->init_done_rc = 0;
         reinit_completion(&adapter->init_done);
         rc = send_login(adapter);
         if (rc)
             return rc;
 
         if (!wait_for_completion_timeout(&adapter->init_done,
                          timeout)) {
             netdev_warn(netdev, "Login timed out, retrying...\n");
             retry = true;
             adapter->init_done_rc = 0;
             retry_count++;
             continue;
         }
 
         if (adapter->init_done_rc == ABORTED) {
             netdev_warn(netdev, "Login aborted, retrying...\n");
             retry = true;
             adapter->init_done_rc = 0;
             retry_count++;
             /* FW or device may be busy, so
              * wait a bit before retrying login
              */
             msleep(500);
         } else if (adapter->init_done_rc == PARTIALSUCCESS) {
             retry_count++;
             release_sub_crqs(adapter, 1);
 
             retry = true;
             netdev_dbg(netdev,
                    "Received partial success, retrying...\n");
             adapter->init_done_rc = 0;
             reinit_completion(&adapter->init_done);
             send_query_cap(adapter);
             if (!wait_for_completion_timeout(&adapter->init_done,
                              timeout)) {
                 netdev_warn(netdev,
                         "Capabilities query timed out\n");
                 return -ETIMEDOUT;
             }
 
             rc = init_sub_crqs(adapter);
             if (rc) {
                 netdev_warn(netdev,
                         "SCRQ initialization failed\n");
                 return rc;
             }
 
             rc = init_sub_crq_irqs(adapter);
             if (rc) {
                 netdev_warn(netdev,
                         "SCRQ irq initialization failed\n");
                 return rc;
             }
         } else if (adapter->init_done_rc) {
             netdev_warn(netdev, "Adapter login failed, init_done_rc = %d\n",
                     adapter->init_done_rc);
             return -EIO;
         }
     } while (retry);
 
     __ibmvnic_set_mac(netdev, adapter->mac_addr);
 
     netdev_dbg(netdev, "[S:%s] Login succeeded\n", adapter_state_to_string(adapter->state));
     return 0;
 }
 
 static void release_login_buffer(struct ibmvnic_adapter *adapter)
 {
     kfree(adapter->login_buf);
     adapter->login_buf = NULL;
 }
 
 static void release_login_rsp_buffer(struct ibmvnic_adapter *adapter)
 {
     kfree(adapter->login_rsp_buf);
     adapter->login_rsp_buf = NULL;
 }
 
 static void release_resources(struct ibmvnic_adapter *adapter)
 {
     release_vpd_data(adapter);
 
     release_napi(adapter);
     release_login_buffer(adapter);
     release_login_rsp_buffer(adapter);
 }
 
 static int set_link_state(struct ibmvnic_adapter *adapter, u8 link_state)
 {
     struct net_device *netdev = adapter->netdev;
     unsigned long timeout = msecs_to_jiffies(20000);
     union ibmvnic_crq crq;
     bool resend;
     int rc;
 
     netdev_dbg(netdev, "setting link state %d\n", link_state);
 
     memset(&crq, 0, sizeof(crq));
     crq.logical_link_state.first = IBMVNIC_CRQ_CMD;
     crq.logical_link_state.cmd = LOGICAL_LINK_STATE;
     crq.logical_link_state.link_state = link_state;
 
     do {
         resend = false;
 
         reinit_completion(&adapter->init_done);
         rc = ibmvnic_send_crq(adapter, &crq);
         if (rc) {
             netdev_err(netdev, "Failed to set link state\n");
             return rc;
         }
 
         if (!wait_for_completion_timeout(&adapter->init_done,
                          timeout)) {
             netdev_err(netdev, "timeout setting link state\n");
             return -ETIMEDOUT;
         }
 
         if (adapter->init_done_rc == PARTIALSUCCESS) {
             /* Partuial success, delay and re-send */
             mdelay(1000);
             resend = true;
         } else if (adapter->init_done_rc) {
             netdev_warn(netdev, "Unable to set link state, rc=%d\n",
                     adapter->init_done_rc);
             return adapter->init_done_rc;
         }
     } while (resend);
 
     return 0;
 }
 
 static int set_real_num_queues(struct net_device *netdev)
 {
     struct ibmvnic_adapter *adapter = netdev_priv(netdev);
     int rc;
 
     netdev_dbg(netdev, "Setting real tx/rx queues (%llx/%llx)\n",
            adapter->req_tx_queues, adapter->req_rx_queues);
 
     rc = netif_set_real_num_tx_queues(netdev, adapter->req_tx_queues);
     if (rc) {
         netdev_err(netdev, "failed to set the number of tx queues\n");
         return rc;
     }
 
     rc = netif_set_real_num_rx_queues(netdev, adapter->req_rx_queues);
     if (rc)
         netdev_err(netdev, "failed to set the number of rx queues\n");
 
     return rc;
 }
 
 static int ibmvnic_get_vpd(struct ibmvnic_adapter *adapter)
 {
     struct device *dev = &adapter->vdev->dev;
     union ibmvnic_crq crq;
     int len = 0;
     int rc;
 
     if (adapter->vpd->buff)
         len = adapter->vpd->len;
 
     mutex_lock(&adapter->fw_lock);
     adapter->fw_done_rc = 0;
     reinit_completion(&adapter->fw_done);
 
     crq.get_vpd_size.first = IBMVNIC_CRQ_CMD;
     crq.get_vpd_size.cmd = GET_VPD_SIZE;
     rc = ibmvnic_send_crq(adapter, &crq);
     if (rc) {
         mutex_unlock(&adapter->fw_lock);
         return rc;
     }
 
     rc = ibmvnic_wait_for_completion(adapter, &adapter->fw_done, 10000);
     if (rc) {
         dev_err(dev, "Could not retrieve VPD size, rc = %d\n", rc);
         mutex_unlock(&adapter->fw_lock);
         return rc;
     }
     mutex_unlock(&adapter->fw_lock);
 
     if (!adapter->vpd->len)
         return -ENODATA;
 
     if (!adapter->vpd->buff)
         adapter->vpd->buff = kzalloc(adapter->vpd->len, GFP_KERNEL);
     else if (adapter->vpd->len != len)
         adapter->vpd->buff =
             krealloc(adapter->vpd->buff,
                  adapter->vpd->len, GFP_KERNEL);
 
     if (!adapter->vpd->buff) {
         dev_err(dev, "Could allocate VPD buffer\n");
         return -ENOMEM;
     }
 
     adapter->vpd->dma_addr =
         dma_map_single(dev, adapter->vpd->buff, adapter->vpd->len,
                    DMA_FROM_DEVICE);
     if (dma_mapping_error(dev, adapter->vpd->dma_addr)) {
         dev_err(dev, "Could not map VPD buffer\n");
         kfree(adapter->vpd->buff);
         adapter->vpd->buff = NULL;
         return -ENOMEM;
     }
 
     mutex_lock(&adapter->fw_lock);
     adapter->fw_done_rc = 0;
     reinit_completion(&adapter->fw_done);
 
     crq.get_vpd.first = IBMVNIC_CRQ_CMD;
     crq.get_vpd.cmd = GET_VPD;
     crq.get_vpd.ioba = cpu_to_be32(adapter->vpd->dma_addr);
     crq.get_vpd.len = cpu_to_be32((u32)adapter->vpd->len);
     rc = ibmvnic_send_crq(adapter, &crq);
     if (rc) {
         kfree(adapter->vpd->buff);
         adapter->vpd->buff = NULL;
         mutex_unlock(&adapter->fw_lock);
         return rc;
     }
 
     rc = ibmvnic_wait_for_completion(adapter, &adapter->fw_done, 10000);
     if (rc) {
         dev_err(dev, "Unable to retrieve VPD, rc = %d\n", rc);
         kfree(adapter->vpd->buff);
         adapter->vpd->buff = NULL;
         mutex_unlock(&adapter->fw_lock);
         return rc;
     }
 
     mutex_unlock(&adapter->fw_lock);
     return 0;
 }
 
 static int init_resources(struct ibmvnic_adapter *adapter)
 {
     struct net_device *netdev = adapter->netdev;
     int rc;
 
     rc = set_real_num_queues(netdev);
     if (rc)
         return rc;
 
     adapter->vpd = kzalloc(sizeof(*adapter->vpd), GFP_KERNEL);
     if (!adapter->vpd)
         return -ENOMEM;
 
     /* Vital Product Data (VPD) */
     rc = ibmvnic_get_vpd(adapter);
     if (rc) {
         netdev_err(netdev, "failed to initialize Vital Product Data (VPD)\n");
         return rc;
     }
 
     rc = init_napi(adapter);
     if (rc)
         return rc;
 
     send_query_map(adapter);
 
     rc = init_rx_pools(netdev);
     if (rc)
         return rc;
 
     rc = init_tx_pools(netdev);
     return rc;
 }
 
 static int __ibmvnic_open(struct net_device *netdev)
 {
     struct ibmvnic_adapter *adapter = netdev_priv(netdev);
     enum vnic_state prev_state = adapter->state;
     int i, rc;
 
     adapter->state = VNIC_OPENING;
     replenish_pools(adapter);
     ibmvnic_napi_enable(adapter);
 
     /* We're ready to receive frames, enable the sub-crq interrupts and
      * set the logical link state to up
      */
     for (i = 0; i < adapter->req_rx_queues; i++) {
         netdev_dbg(netdev, "Enabling rx_scrq[%d] irq\n", i);
         if (prev_state == VNIC_CLOSED)
             enable_irq(adapter->rx_scrq[i]->irq);
         enable_scrq_irq(adapter, adapter->rx_scrq[i]);
     }
 
     for (i = 0; i < adapter->req_tx_queues; i++) {
         netdev_dbg(netdev, "Enabling tx_scrq[%d] irq\n", i);
         if (prev_state == VNIC_CLOSED)
             enable_irq(adapter->tx_scrq[i]->irq);
         enable_scrq_irq(adapter, adapter->tx_scrq[i]);
         netdev_tx_reset_queue(netdev_get_tx_queue(netdev, i));
     }
 
     rc = set_link_state(adapter, IBMVNIC_LOGICAL_LNK_UP);
     if (rc) {
         ibmvnic_napi_disable(adapter);
         ibmvnic_disable_irqs(adapter);
         return rc;
     }
 
     adapter->tx_queues_active = true;
 
     /* Since queues were stopped until now, there shouldn't be any
      * one in ibmvnic_complete_tx() or ibmvnic_xmit() so maybe we
      * don't need the synchronize_rcu()? Leaving it for consistency
      * with setting ->tx_queues_active = false.
      */
     synchronize_rcu();
 
     netif_tx_start_all_queues(netdev);
 
     if (prev_state == VNIC_CLOSED) {
         for (i = 0; i < adapter->req_rx_queues; i++)
             napi_schedule(&adapter->napi[i]);
     }
 
     adapter->state = VNIC_OPEN;
     return rc;
 }
 
 static int ibmvnic_open(struct net_device *netdev)
 {
     struct ibmvnic_adapter *adapter = netdev_priv(netdev);
     int rc;
 
     ASSERT_RTNL();
 
     /* If device failover is pending or we are about to reset, just set
      * device state and return. Device operation will be handled by reset
      * routine.
      *
      * It should be safe to overwrite the adapter->state here. Since
      * we hold the rtnl, either the reset has not actually started or
      * the rtnl got dropped during the set_link_state() in do_reset().
      * In the former case, no one else is changing the state (again we
      * have the rtnl) and in the latter case, do_reset() will detect and
      * honor our setting below.
      */
     if (adapter->failover_pending || (test_bit(0, &adapter->resetting))) {
         netdev_dbg(netdev, "[S:%s FOP:%d] Resetting, deferring open\n",
                adapter_state_to_string(adapter->state),
                adapter->failover_pending);
         adapter->state = VNIC_OPEN;
         rc = 0;
         goto out;
     }
 
     if (adapter->state != VNIC_CLOSED) {
         rc = ibmvnic_login(netdev);
         if (rc)
             goto out;
 
         rc = init_resources(adapter);
         if (rc) {
             netdev_err(netdev, "failed to initialize resources\n");
             goto out;
         }
     }
 
     rc = __ibmvnic_open(netdev);
 
 out:
     /* If open failed and there is a pending failover or in-progress reset,
      * set device state and return. Device operation will be handled by
      * reset routine. See also comments above regarding rtnl.
      */
     if (rc &&
         (adapter->failover_pending || (test_bit(0, &adapter->resetting)))) {
         adapter->state = VNIC_OPEN;
         rc = 0;
     }
 
     if (rc) {
         release_resources(adapter);
         release_rx_pools(adapter);
         release_tx_pools(adapter);
     }
 
     return rc;
 }
 
 static void clean_rx_pools(struct ibmvnic_adapter *adapter)
 {
     struct ibmvnic_rx_pool *rx_pool;
     struct ibmvnic_rx_buff *rx_buff;
     u64 rx_entries;
     int rx_scrqs;
     int i, j;
 
     if (!adapter->rx_pool)
         return;
 
     rx_scrqs = adapter->num_active_rx_pools;
     rx_entries = adapter->req_rx_add_entries_per_subcrq;
 
     /* Free any remaining skbs in the rx buffer pools */
     for (i = 0; i < rx_scrqs; i++) {
         rx_pool = &adapter->rx_pool[i];
         if (!rx_pool || !rx_pool->rx_buff)
             continue;
 
         netdev_dbg(adapter->netdev, "Cleaning rx_pool[%d]\n", i);
         for (j = 0; j < rx_entries; j++) {
             rx_buff = &rx_pool->rx_buff[j];
             if (rx_buff && rx_buff->skb) {
                 dev_kfree_skb_any(rx_buff->skb);
                 rx_buff->skb = NULL;
             }
         }
     }
 }
 
 static void clean_one_tx_pool(struct ibmvnic_adapter *adapter,
                   struct ibmvnic_tx_pool *tx_pool)
 {
     struct ibmvnic_tx_buff *tx_buff;
     u64 tx_entries;
     int i;
 
     if (!tx_pool || !tx_pool->tx_buff)
         return;
 
     tx_entries = tx_pool->num_buffers;
 
     for (i = 0; i < tx_entries; i++) {
         tx_buff = &tx_pool->tx_buff[i];
         if (tx_buff && tx_buff->skb) {
             dev_kfree_skb_any(tx_buff->skb);
             tx_buff->skb = NULL;
         }
     }
 }
 
 static void clean_tx_pools(struct ibmvnic_adapter *adapter)
 {
     int tx_scrqs;
     int i;
 
     if (!adapter->tx_pool || !adapter->tso_pool)
         return;
 
     tx_scrqs = adapter->num_active_tx_pools;
 
     /* Free any remaining skbs in the tx buffer pools */
     for (i = 0; i < tx_scrqs; i++) {
         netdev_dbg(adapter->netdev, "Cleaning tx_pool[%d]\n", i);
         clean_one_tx_pool(adapter, &adapter->tx_pool[i]);
         clean_one_tx_pool(adapter, &adapter->tso_pool[i]);
     }
 }
 
 static void ibmvnic_disable_irqs(struct ibmvnic_adapter *adapter)
 {
     struct net_device *netdev = adapter->netdev;
     int i;
 
     if (adapter->tx_scrq) {
         for (i = 0; i < adapter->req_tx_queues; i++)
             if (adapter->tx_scrq[i]->irq) {
                 netdev_dbg(netdev,
                        "Disabling tx_scrq[%d] irq\n", i);
                 disable_scrq_irq(adapter, adapter->tx_scrq[i]);
                 disable_irq(adapter->tx_scrq[i]->irq);
             }
     }
 
     if (adapter->rx_scrq) {
         for (i = 0; i < adapter->req_rx_queues; i++) {
             if (adapter->rx_scrq[i]->irq) {
                 netdev_dbg(netdev,
                        "Disabling rx_scrq[%d] irq\n", i);
                 disable_scrq_irq(adapter, adapter->rx_scrq[i]);
                 disable_irq(adapter->rx_scrq[i]->irq);
             }
         }
     }
 }
 
 static void ibmvnic_cleanup(struct net_device *netdev)
 {
     struct ibmvnic_adapter *adapter = netdev_priv(netdev);
 
     /* ensure that transmissions are stopped if called by do_reset */
 
     adapter->tx_queues_active = false;
 
     /* Ensure complete_tx() and ibmvnic_xmit() see ->tx_queues_active
      * update so they don't restart a queue after we stop it below.
      */
     synchronize_rcu();
 
     if (test_bit(0, &adapter->resetting))
         netif_tx_disable(netdev);
     else
         netif_tx_stop_all_queues(netdev);
 
     ibmvnic_napi_disable(adapter);
     ibmvnic_disable_irqs(adapter);
 }
 
 static int __ibmvnic_close(struct net_device *netdev)
 {
     struct ibmvnic_adapter *adapter = netdev_priv(netdev);
     int rc = 0;
 
     adapter->state = VNIC_CLOSING;
     rc = set_link_state(adapter, IBMVNIC_LOGICAL_LNK_DN);
     adapter->state = VNIC_CLOSED;
     return rc;
 }
 
 static int ibmvnic_close(struct net_device *netdev)
 {
     struct ibmvnic_adapter *adapter = netdev_priv(netdev);
     int rc;
 
     netdev_dbg(netdev, "[S:%s FOP:%d FRR:%d] Closing\n",
            adapter_state_to_string(adapter->state),
            adapter->failover_pending,
            adapter->force_reset_recovery);
 
     /* If device failover is pending, just set device state and return.
      * Device operation will be handled by reset routine.
      */
     if (adapter->failover_pending) {
         adapter->state = VNIC_CLOSED;
         return 0;
     }
 
     rc = __ibmvnic_close(netdev);
     ibmvnic_cleanup(netdev);
     clean_rx_pools(adapter);
     clean_tx_pools(adapter);
 
     return rc;
 }
 
 /**
  * build_hdr_data - creates L2/L3/L4 header data buffer
  * @hdr_field: bitfield determining needed headers
  * @skb: socket buffer
  * @hdr_len: array of header lengths
  * @hdr_data: buffer to write the header to
  *
  * Reads hdr_field to determine which headers are needed by firmware.
  * Builds a buffer containing these headers.  Saves individual header
  * lengths and total buffer length to be used to build descriptors.
  */
 static int build_hdr_data(u8 hdr_field, struct sk_buff *skb,
               int *hdr_len, u8 *hdr_data)
 {
     int len = 0;
     u8 *hdr;
 
     if (skb_vlan_tagged(skb) && !skb_vlan_tag_present(skb))
         hdr_len[0] = sizeof(struct vlan_ethhdr);
     else
         hdr_len[0] = sizeof(struct ethhdr);
 
     if (skb->protocol == htons(ETH_P_IP)) {
         hdr_len[1] = ip_hdr(skb)->ihl * 4;
         if (ip_hdr(skb)->protocol == IPPROTO_TCP)
             hdr_len[2] = tcp_hdrlen(skb);
         else if (ip_hdr(skb)->protocol == IPPROTO_UDP)
             hdr_len[2] = sizeof(struct udphdr);
     } else if (skb->protocol == htons(ETH_P_IPV6)) {
         hdr_len[1] = sizeof(struct ipv6hdr);
         if (ipv6_hdr(skb)->nexthdr == IPPROTO_TCP)
             hdr_len[2] = tcp_hdrlen(skb);
         else if (ipv6_hdr(skb)->nexthdr == IPPROTO_UDP)
             hdr_len[2] = sizeof(struct udphdr);
     } else if (skb->protocol == htons(ETH_P_ARP)) {
         hdr_len[1] = arp_hdr_len(skb->dev);
         hdr_len[2] = 0;
     }
 
     memset(hdr_data, 0, 120);
     if ((hdr_field >> 6) & 1) {
         hdr = skb_mac_header(skb);
         memcpy(hdr_data, hdr, hdr_len[0]);
         len += hdr_len[0];
     }
 
     if ((hdr_field >> 5) & 1) {
         hdr = skb_network_header(skb);
         memcpy(hdr_data + len, hdr, hdr_len[1]);
         len += hdr_len[1];
     }
 
     if ((hdr_field >> 4) & 1) {
         hdr = skb_transport_header(skb);
         memcpy(hdr_data + len, hdr, hdr_len[2]);
         len += hdr_len[2];
     }
     return len;
 }
 
 /**
  * create_hdr_descs - create header and header extension descriptors
  * @hdr_field: bitfield determining needed headers
  * @hdr_data: buffer containing header data
  * @len: length of data buffer
  * @hdr_len: array of individual header lengths
  * @scrq_arr: descriptor array
  *
  * Creates header and, if needed, header extension descriptors and
  * places them in a descriptor array, scrq_arr
  */
 
 static int create_hdr_descs(u8 hdr_field, u8 *hdr_data, int len, int *hdr_len,
                 union sub_crq *scrq_arr)
 {
     union sub_crq hdr_desc;
     int tmp_len = len;
     int num_descs = 0;
     u8 *data, *cur;
     int tmp;
 
     while (tmp_len > 0) {
         cur = hdr_data + len - tmp_len;
 
         memset(&hdr_desc, 0, sizeof(hdr_desc));
         if (cur != hdr_data) {
             data = hdr_desc.hdr_ext.data;
             tmp = tmp_len > 29 ? 29 : tmp_len;
             hdr_desc.hdr_ext.first = IBMVNIC_CRQ_CMD;
             hdr_desc.hdr_ext.type = IBMVNIC_HDR_EXT_DESC;
             hdr_desc.hdr_ext.len = tmp;
         } else {
             data = hdr_desc.hdr.data;
             tmp = tmp_len > 24 ? 24 : tmp_len;
             hdr_desc.hdr.first = IBMVNIC_CRQ_CMD;
             hdr_desc.hdr.type = IBMVNIC_HDR_DESC;
             hdr_desc.hdr.len = tmp;
             hdr_desc.hdr.l2_len = (u8)hdr_len[0];
             hdr_desc.hdr.l3_len = cpu_to_be16((u16)hdr_len[1]);
             hdr_desc.hdr.l4_len = (u8)hdr_len[2];
             hdr_desc.hdr.flag = hdr_field << 1;
         }
         memcpy(data, cur, tmp);
         tmp_len -= tmp;
         *scrq_arr = hdr_desc;
         scrq_arr++;
         num_descs++;
     }
 
     return num_descs;
 }
 
 /**
  * build_hdr_descs_arr - build a header descriptor array
  * @skb: tx socket buffer
  * @indir_arr: indirect array
  * @num_entries: number of descriptors to be sent
  * @hdr_field: bit field determining which headers will be sent
  *
  * This function will build a TX descriptor array with applicable
  * L2/L3/L4 packet header descriptors to be sent by send_subcrq_indirect.
  */
 
 static void build_hdr_descs_arr(struct sk_buff *skb,
                 union sub_crq *indir_arr,
                 int *num_entries, u8 hdr_field)
 {
     int hdr_len[3] = {0, 0, 0};
     u8 hdr_data[140] = {0};
     int tot_len;
 
     tot_len = build_hdr_data(hdr_field, skb, hdr_len,
                  hdr_data);
     *num_entries += create_hdr_descs(hdr_field, hdr_data, tot_len, hdr_len,
                      indir_arr + 1);
 }
 
 static int ibmvnic_xmit_workarounds(struct sk_buff *skb,
                     struct net_device *netdev)
 {
     /* For some backing devices, mishandling of small packets
      * can result in a loss of connection or TX stall. Device
      * architects recommend that no packet should be smaller
      * than the minimum MTU value provided to the driver, so
      * pad any packets to that length
      */
     if (skb->len < netdev->min_mtu)
         return skb_put_padto(skb, netdev->min_mtu);
 
     return 0;
 }
 
 static void ibmvnic_tx_scrq_clean_buffer(struct ibmvnic_adapter *adapter,
                      struct ibmvnic_sub_crq_queue *tx_scrq)
 {
     struct ibmvnic_ind_xmit_queue *ind_bufp;
     struct ibmvnic_tx_buff *tx_buff;
     struct ibmvnic_tx_pool *tx_pool;
     union sub_crq tx_scrq_entry;
     int queue_num;
     int entries;
     int index;
     int i;
 
     ind_bufp = &tx_scrq->ind_buf;
     entries = (u64)ind_bufp->index;
     queue_num = tx_scrq->pool_index;
 
     for (i = entries - 1; i >= 0; --i) {
         tx_scrq_entry = ind_bufp->indir_arr[i];
         if (tx_scrq_entry.v1.type != IBMVNIC_TX_DESC)
             continue;
         index = be32_to_cpu(tx_scrq_entry.v1.correlator);
         if (index & IBMVNIC_TSO_POOL_MASK) {
             tx_pool = &adapter->tso_pool[queue_num];
             index &= ~IBMVNIC_TSO_POOL_MASK;
         } else {
             tx_pool = &adapter->tx_pool[queue_num];
         }
         tx_pool->free_map[tx_pool->consumer_index] = index;
         tx_pool->consumer_index = tx_pool->consumer_index == 0 ?
                       tx_pool->num_buffers - 1 :
                       tx_pool->consumer_index - 1;
         tx_buff = &tx_pool->tx_buff[index];
         adapter->netdev->stats.tx_packets--;
         adapter->netdev->stats.tx_bytes -= tx_buff->skb->len;
         adapter->tx_stats_buffers[queue_num].packets--;
         adapter->tx_stats_buffers[queue_num].bytes -=
                         tx_buff->skb->len;
         dev_kfree_skb_any(tx_buff->skb);
         tx_buff->skb = NULL;
         adapter->netdev->stats.tx_dropped++;
     }
 
     ind_bufp->index = 0;
 
     if (atomic_sub_return(entries, &tx_scrq->used) <=
         (adapter->req_tx_entries_per_subcrq / 2) &&
         __netif_subqueue_stopped(adapter->netdev, queue_num)) {
         rcu_read_lock();
 
         if (adapter->tx_queues_active) {
             netif_wake_subqueue(adapter->netdev, queue_num);
             netdev_dbg(adapter->netdev, "Started queue %d\n",
                    queue_num);
         }
 
         rcu_read_unlock();
     }
 }
 
 static int ibmvnic_tx_scrq_flush(struct ibmvnic_adapter *adapter,
                  struct ibmvnic_sub_crq_queue *tx_scrq)
 {
     struct ibmvnic_ind_xmit_queue *ind_bufp;
     u64 dma_addr;
     u64 entries;
     u64 handle;
     int rc;
 
     ind_bufp = &tx_scrq->ind_buf;
     dma_addr = (u64)ind_bufp->indir_dma;
     entries = (u64)ind_bufp->index;
     handle = tx_scrq->handle;
 
     if (!entries)
         return 0;
     rc = send_subcrq_indirect(adapter, handle, dma_addr, entries);
     if (rc)
         ibmvnic_tx_scrq_clean_buffer(adapter, tx_scrq);
     else
         ind_bufp->index = 0;
     return 0;
 }
 
 static netdev_tx_t ibmvnic_xmit(struct sk_buff *skb, struct net_device *netdev)
 {
     struct ibmvnic_adapter *adapter = netdev_priv(netdev);
     int queue_num = skb_get_queue_mapping(skb);
     u8 *hdrs = (u8 *)&adapter->tx_rx_desc_req;
     struct device *dev = &adapter->vdev->dev;
     struct ibmvnic_ind_xmit_queue *ind_bufp;
     struct ibmvnic_tx_buff *tx_buff = NULL;
     struct ibmvnic_sub_crq_queue *tx_scrq;
     struct ibmvnic_long_term_buff *ltb;
     struct ibmvnic_tx_pool *tx_pool;
     unsigned int tx_send_failed = 0;
     netdev_tx_t ret = NETDEV_TX_OK;
     unsigned int tx_map_failed = 0;
     union sub_crq indir_arr[16];
     unsigned int tx_dropped = 0;
     unsigned int tx_packets = 0;
     unsigned int tx_bytes = 0;
     dma_addr_t data_dma_addr;
     struct netdev_queue *txq;
     unsigned long lpar_rc;
     union sub_crq tx_crq;
     unsigned int offset;
     int num_entries = 1;
     unsigned char *dst;
     int bufidx = 0;
     u8 proto = 0;
 
     /* If a reset is in progress, drop the packet since
      * the scrqs may get torn down. Otherwise use the
      * rcu to ensure reset waits for us to complete.
      */
     rcu_read_lock();
     if (!adapter->tx_queues_active) {
         dev_kfree_skb_any(skb);
 
         tx_send_failed++;
         tx_dropped++;
         ret = NETDEV_TX_OK;
         goto out;
     }
 
     tx_scrq = adapter->tx_scrq[queue_num];
     txq = netdev_get_tx_queue(netdev, queue_num);
     ind_bufp = &tx_scrq->ind_buf;
 
     if (ibmvnic_xmit_workarounds(skb, netdev)) {
         tx_dropped++;
         tx_send_failed++;
         ret = NETDEV_TX_OK;
         ibmvnic_tx_scrq_flush(adapter, tx_scrq);
         goto out;
     }
 
     if (skb_is_gso(skb))
         tx_pool = &adapter->tso_pool[queue_num];
     else
         tx_pool = &adapter->tx_pool[queue_num];
 
     bufidx = tx_pool->free_map[tx_pool->consumer_index];
 
     if (bufidx == IBMVNIC_INVALID_MAP) {
         dev_kfree_skb_any(skb);
         tx_send_failed++;
         tx_dropped++;
         ibmvnic_tx_scrq_flush(adapter, tx_scrq);
         ret = NETDEV_TX_OK;
         goto out;
     }
 
     tx_pool->free_map[tx_pool->consumer_index] = IBMVNIC_INVALID_MAP;
 
     map_txpool_buf_to_ltb(tx_pool, bufidx, &ltb, &offset);
 
     dst = ltb->buff + offset;
     memset(dst, 0, tx_pool->buf_size);
     data_dma_addr = ltb->addr + offset;
 
     if (skb_shinfo(skb)->nr_frags) {
         int cur, i;
 
         /* Copy the head */
         skb_copy_from_linear_data(skb, dst, skb_headlen(skb));
         cur = skb_headlen(skb);
 
         /* Copy the frags */
         for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
             const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 
             memcpy(dst + cur, skb_frag_address(frag),
                    skb_frag_size(frag));
             cur += skb_frag_size(frag);
         }
     } else {
         skb_copy_from_linear_data(skb, dst, skb->len);
     }
 
     /* post changes to long_term_buff *dst before VIOS accessing it */
     dma_wmb();
 
     tx_pool->consumer_index =
         (tx_pool->consumer_index + 1) % tx_pool->num_buffers;
 
     tx_buff = &tx_pool->tx_buff[bufidx];
     tx_buff->skb = skb;
     tx_buff->index = bufidx;
     tx_buff->pool_index = queue_num;
 
     memset(&tx_crq, 0, sizeof(tx_crq));
     tx_crq.v1.first = IBMVNIC_CRQ_CMD;
     tx_crq.v1.type = IBMVNIC_TX_DESC;
     tx_crq.v1.n_crq_elem = 1;
     tx_crq.v1.n_sge = 1;
     tx_crq.v1.flags1 = IBMVNIC_TX_COMP_NEEDED;
 
     if (skb_is_gso(skb))
         tx_crq.v1.correlator =
             cpu_to_be32(bufidx | IBMVNIC_TSO_POOL_MASK);
     else
         tx_crq.v1.correlator = cpu_to_be32(bufidx);
     tx_crq.v1.dma_reg = cpu_to_be16(ltb->map_id);
     tx_crq.v1.sge_len = cpu_to_be32(skb->len);
     tx_crq.v1.ioba = cpu_to_be64(data_dma_addr);
 
     if (adapter->vlan_header_insertion && skb_vlan_tag_present(skb)) {
         tx_crq.v1.flags2 |= IBMVNIC_TX_VLAN_INSERT;
         tx_crq.v1.vlan_id = cpu_to_be16(skb->vlan_tci);
     }
 
     if (skb->protocol == htons(ETH_P_IP)) {
         tx_crq.v1.flags1 |= IBMVNIC_TX_PROT_IPV4;
         proto = ip_hdr(skb)->protocol;
     } else if (skb->protocol == htons(ETH_P_IPV6)) {
         tx_crq.v1.flags1 |= IBMVNIC_TX_PROT_IPV6;
         proto = ipv6_hdr(skb)->nexthdr;
     }
 
     if (proto == IPPROTO_TCP)
         tx_crq.v1.flags1 |= IBMVNIC_TX_PROT_TCP;
     else if (proto == IPPROTO_UDP)
         tx_crq.v1.flags1 |= IBMVNIC_TX_PROT_UDP;
 
     if (skb->ip_summed == CHECKSUM_PARTIAL) {
         tx_crq.v1.flags1 |= IBMVNIC_TX_CHKSUM_OFFLOAD;
         hdrs += 2;
     }
     if (skb_is_gso(skb)) {
         tx_crq.v1.flags1 |= IBMVNIC_TX_LSO;
         tx_crq.v1.mss = cpu_to_be16(skb_shinfo(skb)->gso_size);
         hdrs += 2;
     }
 
     if ((*hdrs >> 7) & 1)
         build_hdr_descs_arr(skb, indir_arr, &num_entries, *hdrs);
 
     tx_crq.v1.n_crq_elem = num_entries;
     tx_buff->num_entries = num_entries;
     /* flush buffer if current entry can not fit */
     if (num_entries + ind_bufp->index > IBMVNIC_MAX_IND_DESCS) {
         lpar_rc = ibmvnic_tx_scrq_flush(adapter, tx_scrq);
         if (lpar_rc != H_SUCCESS)
             goto tx_flush_err;
     }
 
     indir_arr[0] = tx_crq;
     memcpy(&ind_bufp->indir_arr[ind_bufp->index], &indir_arr[0],
            num_entries * sizeof(struct ibmvnic_generic_scrq));
     ind_bufp->index += num_entries;
     if (__netdev_tx_sent_queue(txq, skb->len,
                    netdev_xmit_more() &&
                    ind_bufp->index < IBMVNIC_MAX_IND_DESCS)) {
         lpar_rc = ibmvnic_tx_scrq_flush(adapter, tx_scrq);
         if (lpar_rc != H_SUCCESS)
             goto tx_err;
     }
 
     if (atomic_add_return(num_entries, &tx_scrq->used)
                     >= adapter->req_tx_entries_per_subcrq) {
         netdev_dbg(netdev, "Stopping queue %d\n", queue_num);
         netif_stop_subqueue(netdev, queue_num);
     }
 
     tx_packets++;
     tx_bytes += skb->len;
     txq_trans_cond_update(txq);
     ret = NETDEV_TX_OK;
     goto out;
 
 tx_flush_err:
     dev_kfree_skb_any(skb);
     tx_buff->skb = NULL;
     tx_pool->consumer_index = tx_pool->consumer_index == 0 ?
                   tx_pool->num_buffers - 1 :
                   tx_pool->consumer_index - 1;
     tx_dropped++;
 tx_err:
     if (lpar_rc != H_CLOSED && lpar_rc != H_PARAMETER)
         dev_err_ratelimited(dev, "tx: send failed\n");
 
     if (lpar_rc == H_CLOSED || adapter->failover_pending) {
         /* Disable TX and report carrier off if queue is closed
          * or pending failover.
          * Firmware guarantees that a signal will be sent to the
          * driver, triggering a reset or some other action.
          */
         netif_tx_stop_all_queues(netdev);
         netif_carrier_off(netdev);
     }
 out:
     rcu_read_unlock();
     netdev->stats.tx_dropped += tx_dropped;
     netdev->stats.tx_bytes += tx_bytes;
     netdev->stats.tx_packets += tx_packets;
     adapter->tx_send_failed += tx_send_failed;
     adapter->tx_map_failed += tx_map_failed;
     adapter->tx_stats_buffers[queue_num].packets += tx_packets;
     adapter->tx_stats_buffers[queue_num].bytes += tx_bytes;
     adapter->tx_stats_buffers[queue_num].dropped_packets += tx_dropped;
 
     return ret;
 }
 
 static void ibmvnic_set_multi(struct net_device *netdev)
 {
     struct ibmvnic_adapter *adapter = netdev_priv(netdev);
     struct netdev_hw_addr *ha;
     union ibmvnic_crq crq;
 
     memset(&crq, 0, sizeof(crq));
     crq.request_capability.first = IBMVNIC_CRQ_CMD;
     crq.request_capability.cmd = REQUEST_CAPABILITY;
 
     if (netdev->flags & IFF_PROMISC) {
         if (!adapter->promisc_supported)
             return;
     } else {
         if (netdev->flags & IFF_ALLMULTI) {
             /* Accept all multicast */
             memset(&crq, 0, sizeof(crq));
             crq.multicast_ctrl.first = IBMVNIC_CRQ_CMD;
             crq.multicast_ctrl.cmd = MULTICAST_CTRL;
             crq.multicast_ctrl.flags = IBMVNIC_ENABLE_ALL;
             ibmvnic_send_crq(adapter, &crq);
         } else if (netdev_mc_empty(netdev)) {
             /* Reject all multicast */
             memset(&crq, 0, sizeof(crq));
             crq.multicast_ctrl.first = IBMVNIC_CRQ_CMD;
             crq.multicast_ctrl.cmd = MULTICAST_CTRL;
             crq.multicast_ctrl.flags = IBMVNIC_DISABLE_ALL;
             ibmvnic_send_crq(adapter, &crq);
         } else {
             /* Accept one or more multicast(s) */
             netdev_for_each_mc_addr(ha, netdev) {
                 memset(&crq, 0, sizeof(crq));
                 crq.multicast_ctrl.first = IBMVNIC_CRQ_CMD;
                 crq.multicast_ctrl.cmd = MULTICAST_CTRL;
                 crq.multicast_ctrl.flags = IBMVNIC_ENABLE_MC;
                 ether_addr_copy(&crq.multicast_ctrl.mac_addr[0],
                         ha->addr);
                 ibmvnic_send_crq(adapter, &crq);
             }
         }
     }
 }
 
 static int __ibmvnic_set_mac(struct net_device *netdev, u8 *dev_addr)
 {
     struct ibmvnic_adapter *adapter = netdev_priv(netdev);
     union ibmvnic_crq crq;
     int rc;
 
     if (!is_valid_ether_addr(dev_addr)) {
         rc = -EADDRNOTAVAIL;
         goto err;
     }
 
     memset(&crq, 0, sizeof(crq));
     crq.change_mac_addr.first = IBMVNIC_CRQ_CMD;
     crq.change_mac_addr.cmd = CHANGE_MAC_ADDR;
     ether_addr_copy(&crq.change_mac_addr.mac_addr[0], dev_addr);
 
     mutex_lock(&adapter->fw_lock);
     adapter->fw_done_rc = 0;
     reinit_completion(&adapter->fw_done);
 
     rc = ibmvnic_send_crq(adapter, &crq);
     if (rc) {
         rc = -EIO;
         mutex_unlock(&adapter->fw_lock);
         goto err;
     }
 
     rc = ibmvnic_wait_for_completion(adapter, &adapter->fw_done, 10000);
     /* netdev->dev_addr is changed in handle_change_mac_rsp function */
     if (rc || adapter->fw_done_rc) {
         rc = -EIO;
         mutex_unlock(&adapter->fw_lock);
         goto err;
     }
     mutex_unlock(&adapter->fw_lock);
     return 0;
 err:
     ether_addr_copy(adapter->mac_addr, netdev->dev_addr);
     return rc;
 }
 
 static int ibmvnic_set_mac(struct net_device *netdev, void *p)
 {
     struct ibmvnic_adapter *adapter = netdev_priv(netdev);
     struct sockaddr *addr = p;
     int rc;
 
     rc = 0;
     if (!is_valid_ether_addr(addr->sa_data))
         return -EADDRNOTAVAIL;
 
     ether_addr_copy(adapter->mac_addr, addr->sa_data);
     if (adapter->state != VNIC_PROBED)
         rc = __ibmvnic_set_mac(netdev, addr->sa_data);
 
     return rc;
 }
 
 static const char *reset_reason_to_string(enum ibmvnic_reset_reason reason)
 {
     switch (reason) {
     case VNIC_RESET_FAILOVER:
         return "FAILOVER";
     case VNIC_RESET_MOBILITY:
         return "MOBILITY";
     case VNIC_RESET_FATAL:
         return "FATAL";
     case VNIC_RESET_NON_FATAL:
         return "NON_FATAL";
     case VNIC_RESET_TIMEOUT:
         return "TIMEOUT";
     case VNIC_RESET_CHANGE_PARAM:
         return "CHANGE_PARAM";
     case VNIC_RESET_PASSIVE_INIT:
         return "PASSIVE_INIT";
     }
     return "UNKNOWN";
 }
 
 /*
  * Initialize the init_done completion and return code values. We
  * can get a transport event just after registering the CRQ and the
  * tasklet will use this to communicate the transport event. To ensure
  * we don't miss the notification/error, initialize these _before_
  * regisering the CRQ.
  */
 static inline void reinit_init_done(struct ibmvnic_adapter *adapter)
 {
     reinit_completion(&adapter->init_done);
     adapter->init_done_rc = 0;
 }
 
 /*
  * do_reset returns zero if we are able to keep processing reset events, or
  * non-zero if we hit a fatal error and must halt.
  */
 static int do_reset(struct ibmvnic_adapter *adapter,
             struct ibmvnic_rwi *rwi, u32 reset_state)
 {
     struct net_device *netdev = adapter->netdev;
     u64 old_num_rx_queues, old_num_tx_queues;
     u64 old_num_rx_slots, old_num_tx_slots;
     int rc;
 
     netdev_dbg(adapter->netdev,
            "[S:%s FOP:%d] Reset reason: %s, reset_state: %s\n",
            adapter_state_to_string(adapter->state),
            adapter->failover_pending,
            reset_reason_to_string(rwi->reset_reason),
            adapter_state_to_string(reset_state));
 
     adapter->reset_reason = rwi->reset_reason;
     /* requestor of VNIC_RESET_CHANGE_PARAM already has the rtnl lock */
     if (!(adapter->reset_reason == VNIC_RESET_CHANGE_PARAM))
         rtnl_lock();
 
     /* Now that we have the rtnl lock, clear any pending failover.
      * This will ensure ibmvnic_open() has either completed or will
      * block until failover is complete.
      */
     if (rwi->reset_reason == VNIC_RESET_FAILOVER)
         adapter->failover_pending = false;
 
     /* read the state and check (again) after getting rtnl */
     reset_state = adapter->state;
 
     if (reset_state == VNIC_REMOVING || reset_state == VNIC_REMOVED) {
         rc = -EBUSY;
         goto out;
     }
 
     netif_carrier_off(netdev);
 
     old_num_rx_queues = adapter->req_rx_queues;
     old_num_tx_queues = adapter->req_tx_queues;
     old_num_rx_slots = adapter->req_rx_add_entries_per_subcrq;
     old_num_tx_slots = adapter->req_tx_entries_per_subcrq;
 
     ibmvnic_cleanup(netdev);
 
     if (reset_state == VNIC_OPEN &&
         adapter->reset_reason != VNIC_RESET_MOBILITY &&
         adapter->reset_reason != VNIC_RESET_FAILOVER) {
         if (adapter->reset_reason == VNIC_RESET_CHANGE_PARAM) {
             rc = __ibmvnic_close(netdev);
             if (rc)
                 goto out;
         } else {
             adapter->state = VNIC_CLOSING;
 
             /* Release the RTNL lock before link state change and
              * re-acquire after the link state change to allow
              * linkwatch_event to grab the RTNL lock and run during
              * a reset.
              */
             rtnl_unlock();
             rc = set_link_state(adapter, IBMVNIC_LOGICAL_LNK_DN);
             rtnl_lock();
             if (rc)
                 goto out;
 
             if (adapter->state == VNIC_OPEN) {
                 /* When we dropped rtnl, ibmvnic_open() got
                  * it and noticed that we are resetting and
                  * set the adapter state to OPEN. Update our
                  * new "target" state, and resume the reset
                  * from VNIC_CLOSING state.
                  */
                 netdev_dbg(netdev,
                        "Open changed state from %s, updating.\n",
                        adapter_state_to_string(reset_state));
                 reset_state = VNIC_OPEN;
                 adapter->state = VNIC_CLOSING;
             }
 
             if (adapter->state != VNIC_CLOSING) {
                 /* If someone else changed the adapter state
                  * when we dropped the rtnl, fail the reset
                  */
                 rc = -EAGAIN;
                 goto out;
             }
             adapter->state = VNIC_CLOSED;
         }
     }
 
     if (adapter->reset_reason == VNIC_RESET_CHANGE_PARAM) {
         release_resources(adapter);
         release_sub_crqs(adapter, 1);
         release_crq_queue(adapter);
     }
 
     if (adapter->reset_reason != VNIC_RESET_NON_FATAL) {
         /* remove the closed state so when we call open it appears
          * we are coming from the probed state.
          */
         adapter->state = VNIC_PROBED;
 
         reinit_init_done(adapter);
 
         if (adapter->reset_reason == VNIC_RESET_CHANGE_PARAM) {
             rc = init_crq_queue(adapter);
         } else if (adapter->reset_reason == VNIC_RESET_MOBILITY) {
             rc = ibmvnic_reenable_crq_queue(adapter);
             release_sub_crqs(adapter, 1);
         } else {
             rc = ibmvnic_reset_crq(adapter);
             if (rc == H_CLOSED || rc == H_SUCCESS) {
                 rc = vio_enable_interrupts(adapter->vdev);
                 if (rc)
                     netdev_err(adapter->netdev,
                            "Reset failed to enable interrupts. rc=%d\n",
                            rc);
             }
         }
 
         if (rc) {
             netdev_err(adapter->netdev,
                    "Reset couldn't initialize crq. rc=%d\n", rc);
             goto out;
         }
 
         rc = ibmvnic_reset_init(adapter, true);
         if (rc)
             goto out;
 
         /* If the adapter was in PROBE or DOWN state prior to the reset,
          * exit here.
          */
         if (reset_state == VNIC_PROBED || reset_state == VNIC_DOWN) {
             rc = 0;
             goto out;
         }
 
         rc = ibmvnic_login(netdev);
         if (rc)
             goto out;
 
         if (adapter->reset_reason == VNIC_RESET_CHANGE_PARAM) {
             rc = init_resources(adapter);
             if (rc)
                 goto out;
         } else if (adapter->req_rx_queues != old_num_rx_queues ||
             adapter->req_tx_queues != old_num_tx_queues ||
             adapter->req_rx_add_entries_per_subcrq !=
             old_num_rx_slots ||
             adapter->req_tx_entries_per_subcrq !=
             old_num_tx_slots ||
             !adapter->rx_pool ||
             !adapter->tso_pool ||
             !adapter->tx_pool) {
             release_napi(adapter);
             release_vpd_data(adapter);
 
             rc = init_resources(adapter);
             if (rc)
                 goto out;
 
         } else {
             rc = init_tx_pools(netdev);
             if (rc) {
                 netdev_dbg(netdev,
                        "init tx pools failed (%d)\n",
                        rc);
                 goto out;
             }
 
             rc = init_rx_pools(netdev);
             if (rc) {
                 netdev_dbg(netdev,
                        "init rx pools failed (%d)\n",
                        rc);
                 goto out;
             }
         }
         ibmvnic_disable_irqs(adapter);
     }
     adapter->state = VNIC_CLOSED;
 
     if (reset_state == VNIC_CLOSED) {
         rc = 0;
         goto out;
     }
 
     rc = __ibmvnic_open(netdev);
     if (rc) {
         rc = IBMVNIC_OPEN_FAILED;
         goto out;
     }
 
     /* refresh device's multicast list */
     ibmvnic_set_multi(netdev);
 
     if (adapter->reset_reason == VNIC_RESET_FAILOVER ||
         adapter->reset_reason == VNIC_RESET_MOBILITY)
         __netdev_notify_peers(netdev);
 
     rc = 0;
 
 out:
     /* restore the adapter state if reset failed */
     if (rc)
         adapter->state = reset_state;
     /* requestor of VNIC_RESET_CHANGE_PARAM should still hold the rtnl lock */
     if (!(adapter->reset_reason == VNIC_RESET_CHANGE_PARAM))
         rtnl_unlock();
 
     netdev_dbg(adapter->netdev, "[S:%s FOP:%d] Reset done, rc %d\n",
            adapter_state_to_string(adapter->state),
            adapter->failover_pending, rc);
     return rc;
 }
 
 static int do_hard_reset(struct ibmvnic_adapter *adapter,
              struct ibmvnic_rwi *rwi, u32 reset_state)
 {
     struct net_device *netdev = adapter->netdev;
     int rc;
 
     netdev_dbg(adapter->netdev, "Hard resetting driver (%s)\n",
            reset_reason_to_string(rwi->reset_reason));
 
     /* read the state and check (again) after getting rtnl */
     reset_state = adapter->state;
 
     if (reset_state == VNIC_REMOVING || reset_state == VNIC_REMOVED) {
         rc = -EBUSY;
         goto out;
     }
 
     netif_carrier_off(netdev);
     adapter->reset_reason = rwi->reset_reason;
 
     ibmvnic_cleanup(netdev);
     release_resources(adapter);
     release_sub_crqs(adapter, 0);
     release_crq_queue(adapter);
 
     /* remove the closed state so when we call open it appears
      * we are coming from the probed state.
      */
     adapter->state = VNIC_PROBED;
 
     reinit_init_done(adapter);
 
     rc = init_crq_queue(adapter);
     if (rc) {
         netdev_err(adapter->netdev,
                "Couldn't initialize crq. rc=%d\n", rc);
         goto out;
     }
 
     rc = ibmvnic_reset_init(adapter, false);
     if (rc)
         goto out;
 
     /* If the adapter was in PROBE or DOWN state prior to the reset,
      * exit here.
      */
     if (reset_state == VNIC_PROBED || reset_state == VNIC_DOWN)
         goto out;
 
     rc = ibmvnic_login(netdev);
     if (rc)
         goto out;
 
     rc = init_resources(adapter);
     if (rc)
         goto out;
 
     ibmvnic_disable_irqs(adapter);
     adapter->state = VNIC_CLOSED;
 
     if (reset_state == VNIC_CLOSED)
         goto out;
 
     rc = __ibmvnic_open(netdev);
     if (rc) {
         rc = IBMVNIC_OPEN_FAILED;
         goto out;
     }
 
     __netdev_notify_peers(netdev);
 out:
     /* restore adapter state if reset failed */
     if (rc)
         adapter->state = reset_state;
     netdev_dbg(adapter->netdev, "[S:%s FOP:%d] Hard reset done, rc %d\n",
            adapter_state_to_string(adapter->state),
            adapter->failover_pending, rc);
     return rc;
 }
 
 static struct ibmvnic_rwi *get_next_rwi(struct ibmvnic_adapter *adapter)
 {
     struct ibmvnic_rwi *rwi;
     unsigned long flags;
 
     spin_lock_irqsave(&adapter->rwi_lock, flags);
 
     if (!list_empty(&adapter->rwi_list)) {
         rwi = list_first_entry(&adapter->rwi_list, struct ibmvnic_rwi,
                        list);
         list_del(&rwi->list);
     } else {
         rwi = NULL;
     }
 
     spin_unlock_irqrestore(&adapter->rwi_lock, flags);
     return rwi;
 }
 
 /**
  * do_passive_init - complete probing when partner device is detected.
  * @adapter: ibmvnic_adapter struct
  *
  * If the ibmvnic device does not have a partner device to communicate with at boot
  * and that partner device comes online at a later time, this function is called
  * to complete the initialization process of ibmvnic device.
  * Caller is expected to hold rtnl_lock().
  *
  * Returns non-zero if sub-CRQs are not initialized properly leaving the device
  * in the down state.
  * Returns 0 upon success and the device is in PROBED state.
  */
 
 static int do_passive_init(struct ibmvnic_adapter *adapter)
 {
     unsigned long timeout = msecs_to_jiffies(30000);
     struct net_device *netdev = adapter->netdev;
     struct device *dev = &adapter->vdev->dev;
     int rc;
 
     netdev_dbg(netdev, "Partner device found, probing.\n");
 
     adapter->state = VNIC_PROBING;
     reinit_completion(&adapter->init_done);
     adapter->init_done_rc = 0;
     adapter->crq.active = true;
 
     rc = send_crq_init_complete(adapter);
     if (rc)
         goto out;
 
     rc = send_version_xchg(adapter);
     if (rc)
         netdev_dbg(adapter->netdev, "send_version_xchg failed, rc=%d\n", rc);
 
     if (!wait_for_completion_timeout(&adapter->init_done, timeout)) {
         dev_err(dev, "Initialization sequence timed out\n");
         rc = -ETIMEDOUT;
         goto out;
     }
 
     rc = init_sub_crqs(adapter);
     if (rc) {
         dev_err(dev, "Initialization of sub crqs failed, rc=%d\n", rc);
         goto out;
     }
 
     rc = init_sub_crq_irqs(adapter);
     if (rc) {
         dev_err(dev, "Failed to initialize sub crq irqs\n, rc=%d", rc);
         goto init_failed;
     }
 
     netdev->mtu = adapter->req_mtu - ETH_HLEN;
     netdev->min_mtu = adapter->min_mtu - ETH_HLEN;
     netdev->max_mtu = adapter->max_mtu - ETH_HLEN;
 
     adapter->state = VNIC_PROBED;
     netdev_dbg(netdev, "Probed successfully. Waiting for signal from partner device.\n");
 
     return 0;
 
 init_failed:
     release_sub_crqs(adapter, 1);
 out:
     adapter->state = VNIC_DOWN;
     return rc;
 }
 
 static void __ibmvnic_reset(struct work_struct *work)
 {
     struct ibmvnic_adapter *adapter;
     unsigned int timeout = 5000;
     struct ibmvnic_rwi *tmprwi;
     bool saved_state = false;
     struct ibmvnic_rwi *rwi;
     unsigned long flags;
     struct device *dev;
     bool need_reset;
     int num_fails = 0;
     u32 reset_state;
     int rc = 0;
 
     adapter = container_of(work, struct ibmvnic_adapter, ibmvnic_reset);
         dev = &adapter->vdev->dev;
 
     /* Wait for ibmvnic_probe() to complete. If probe is taking too long
      * or if another reset is in progress, defer work for now. If probe
      * eventually fails it will flush and terminate our work.
      *
      * Three possibilities here:
      * 1. Adpater being removed  - just return
      * 2. Timed out on probe or another reset in progress - delay the work
      * 3. Completed probe - perform any resets in queue
      */
     if (adapter->state == VNIC_PROBING &&
         !wait_for_completion_timeout(&adapter->probe_done, timeout)) {
         dev_err(dev, "Reset thread timed out on probe");
         queue_delayed_work(system_long_wq,
                    &adapter->ibmvnic_delayed_reset,
                    IBMVNIC_RESET_DELAY);
         return;
     }
 
     /* adapter is done with probe (i.e state is never VNIC_PROBING now) */
     if (adapter->state == VNIC_REMOVING)
         return;
 
     /* ->rwi_list is stable now (no one else is removing entries) */
 
     /* ibmvnic_probe() may have purged the reset queue after we were
      * scheduled to process a reset so there maybe no resets to process.
      * Before setting the ->resetting bit though, we have to make sure
      * that there is infact a reset to process. Otherwise we may race
      * with ibmvnic_open() and end up leaving the vnic down:
      *
      *  __ibmvnic_reset()       ibmvnic_open()
      *  -----------------       --------------
      *
      *  set ->resetting bit
      *                  find ->resetting bit is set
      *                  set ->state to IBMVNIC_OPEN (i.e
      *                  assume reset will open device)
      *                  return
      *  find reset queue empty
      *  return
      *
      *      Neither performed vnic login/open and vnic stays down
      *
      * If we hold the lock and conditionally set the bit, either we
      * or ibmvnic_open() will complete the open.
      */
     need_reset = false;
     spin_lock(&adapter->rwi_lock);
     if (!list_empty(&adapter->rwi_list)) {
         if (test_and_set_bit_lock(0, &adapter->resetting)) {
             queue_delayed_work(system_long_wq,
                        &adapter->ibmvnic_delayed_reset,
                        IBMVNIC_RESET_DELAY);
         } else {
             need_reset = true;
         }
     }
     spin_unlock(&adapter->rwi_lock);
 
     if (!need_reset)
         return;
 
     rwi = get_next_rwi(adapter);
     while (rwi) {
         spin_lock_irqsave(&adapter->state_lock, flags);
 
         if (adapter->state == VNIC_REMOVING ||
             adapter->state == VNIC_REMOVED) {
             spin_unlock_irqrestore(&adapter->state_lock, flags);
             kfree(rwi);
             rc = EBUSY;
             break;
         }
 
         if (!saved_state) {
             reset_state = adapter->state;
             saved_state = true;
         }
         spin_unlock_irqrestore(&adapter->state_lock, flags);
 
         if (rwi->reset_reason == VNIC_RESET_PASSIVE_INIT) {
             rtnl_lock();
             rc = do_passive_init(adapter);
             rtnl_unlock();
             if (!rc)
                 netif_carrier_on(adapter->netdev);
         } else if (adapter->force_reset_recovery) {
             /* Since we are doing a hard reset now, clear the
              * failover_pending flag so we don't ignore any
              * future MOBILITY or other resets.
              */
             adapter->failover_pending = false;
 
             /* Transport event occurred during previous reset */
             if (adapter->wait_for_reset) {
                 /* Previous was CHANGE_PARAM; caller locked */
                 adapter->force_reset_recovery = false;
                 rc = do_hard_reset(adapter, rwi, reset_state);
             } else {
                 rtnl_lock();
                 adapter->force_reset_recovery = false;
                 rc = do_hard_reset(adapter, rwi, reset_state);
                 rtnl_unlock();
             }
             if (rc)
                 num_fails++;
             else
                 num_fails = 0;
 
             /* If auto-priority-failover is enabled we can get
              * back to back failovers during resets, resulting
              * in at least two failed resets (from high-priority
              * backing device to low-priority one and then back)
              * If resets continue to fail beyond that, give the
              * adapter some time to settle down before retrying.
              */
             if (num_fails >= 3) {
                 netdev_dbg(adapter->netdev,
                        "[S:%s] Hard reset failed %d times, waiting 60 secs\n",
                        adapter_state_to_string(adapter->state),
                        num_fails);
                 set_current_state(TASK_UNINTERRUPTIBLE);
                 schedule_timeout(60 * HZ);
             }
         } else {
             rc = do_reset(adapter, rwi, reset_state);
         }
         tmprwi = rwi;
         adapter->last_reset_time = jiffies;
 
         if (rc)
             netdev_dbg(adapter->netdev, "Reset failed, rc=%d\n", rc);
 
         rwi = get_next_rwi(adapter);
 
         /*
          * If there is another reset queued, free the previous rwi
          * and process the new reset even if previous reset failed
          * (the previous reset could have failed because of a fail
          * over for instance, so process the fail over).
          *
          * If there are no resets queued and the previous reset failed,
          * the adapter would be in an undefined state. So retry the
          * previous reset as a hard reset.
          */
         if (rwi)
             kfree(tmprwi);
         else if (rc)
             rwi = tmprwi;
 
         if (rwi && (rwi->reset_reason == VNIC_RESET_FAILOVER ||
                 rwi->reset_reason == VNIC_RESET_MOBILITY || rc))
             adapter->force_reset_recovery = true;
     }
 
     if (adapter->wait_for_reset) {
         adapter->reset_done_rc = rc;
         complete(&adapter->reset_done);
     }
 
     clear_bit_unlock(0, &adapter->resetting);
 
     netdev_dbg(adapter->netdev,
            "[S:%s FRR:%d WFR:%d] Done processing resets\n",
            adapter_state_to_string(adapter->state),
            adapter->force_reset_recovery,
            adapter->wait_for_reset);
 }
 
 static void __ibmvnic_delayed_reset(struct work_struct *work)
 {
     struct ibmvnic_adapter *adapter;
 
     adapter = container_of(work, struct ibmvnic_adapter,
                    ibmvnic_delayed_reset.work);
     __ibmvnic_reset(&adapter->ibmvnic_reset);
 }
 
 static void flush_reset_queue(struct ibmvnic_adapter *adapter)
 {
     struct list_head *entry, *tmp_entry;
 
     if (!list_empty(&adapter->rwi_list)) {
         list_for_each_safe(entry, tmp_entry, &adapter->rwi_list) {
             list_del(entry);
             kfree(list_entry(entry, struct ibmvnic_rwi, list));
         }
     }
 }
 
 static int ibmvnic_reset(struct ibmvnic_adapter *adapter,
              enum ibmvnic_reset_reason reason)
 {
     struct net_device *netdev = adapter->netdev;
     struct ibmvnic_rwi *rwi, *tmp;
     unsigned long flags;
     int ret;
 
     spin_lock_irqsave(&adapter->rwi_lock, flags);
 
     /* If failover is pending don't schedule any other reset.
      * Instead let the failover complete. If there is already a
      * a failover reset scheduled, we will detect and drop the
      * duplicate reset when walking the ->rwi_list below.
      */
     if (adapter->state == VNIC_REMOVING ||
         adapter->state == VNIC_REMOVED ||
         (adapter->failover_pending && reason != VNIC_RESET_FAILOVER)) {
         ret = EBUSY;
         netdev_dbg(netdev, "Adapter removing or pending failover, skipping reset\n");
         goto err;
     }
 
     list_for_each_entry(tmp, &adapter->rwi_list, list) {
         if (tmp->reset_reason == reason) {
             netdev_dbg(netdev, "Skipping matching reset, reason=%s\n",
                    reset_reason_to_string(reason));
             ret = EBUSY;
             goto err;
         }
     }
 
     rwi = kzalloc(sizeof(*rwi), GFP_ATOMIC);
     if (!rwi) {
         ret = ENOMEM;
         goto err;
     }
     /* if we just received a transport event,
      * flush reset queue and process this reset
      */
     if (adapter->force_reset_recovery)
         flush_reset_queue(adapter);
 
     rwi->reset_reason = reason;
     list_add_tail(&rwi->list, &adapter->rwi_list);
     netdev_dbg(adapter->netdev, "Scheduling reset (reason %s)\n",
            reset_reason_to_string(reason));
     queue_work(system_long_wq, &adapter->ibmvnic_reset);
 
     ret = 0;
 err:
     /* ibmvnic_close() below can block, so drop the lock first */
     spin_unlock_irqrestore(&adapter->rwi_lock, flags);
 
     if (ret == ENOMEM)
         ibmvnic_close(netdev);
 
     return -ret;
 }
 
 static void ibmvnic_tx_timeout(struct net_device *dev, unsigned int txqueue)
 {
     struct ibmvnic_adapter *adapter = netdev_priv(dev);
 
     if (test_bit(0, &adapter->resetting)) {
         netdev_err(adapter->netdev,
                "Adapter is resetting, skip timeout reset\n");
         return;
     }
     /* No queuing up reset until at least 5 seconds (default watchdog val)
      * after last reset
      */
     if (time_before(jiffies, (adapter->last_reset_time + dev->watchdog_timeo))) {
         netdev_dbg(dev, "Not yet time to tx timeout.\n");
         return;
     }
     ibmvnic_reset(adapter, VNIC_RESET_TIMEOUT);
 }
 
 static void remove_buff_from_pool(struct ibmvnic_adapter *adapter,
                   struct ibmvnic_rx_buff *rx_buff)
 {
     struct ibmvnic_rx_pool *pool = &adapter->rx_pool[rx_buff->pool_index];
 
     rx_buff->skb = NULL;
 
     pool->free_map[pool->next_alloc] = (int)(rx_buff - pool->rx_buff);
     pool->next_alloc = (pool->next_alloc + 1) % pool->size;
 
     atomic_dec(&pool->available);
 }
 
 static int ibmvnic_poll(struct napi_struct *napi, int budget)
 {
     struct ibmvnic_sub_crq_queue *rx_scrq;
     struct ibmvnic_adapter *adapter;
     struct net_device *netdev;
     int frames_processed;
     int scrq_num;
 
     netdev = napi->dev;
     adapter = netdev_priv(netdev);
     scrq_num = (int)(napi - adapter->napi);
     frames_processed = 0;
     rx_scrq = adapter->rx_scrq[scrq_num];
 
 restart_poll:
     while (frames_processed < budget) {
         struct sk_buff *skb;
         struct ibmvnic_rx_buff *rx_buff;
         union sub_crq *next;
         u32 length;
         u16 offset;
         u8 flags = 0;
 
         if (unlikely(test_bit(0, &adapter->resetting) &&
                  adapter->reset_reason != VNIC_RESET_NON_FATAL)) {
             enable_scrq_irq(adapter, rx_scrq);
             napi_complete_done(napi, frames_processed);
             return frames_processed;
         }
 
         if (!pending_scrq(adapter, rx_scrq))
             break;
         next = ibmvnic_next_scrq(adapter, rx_scrq);
         rx_buff = (struct ibmvnic_rx_buff *)
               be64_to_cpu(next->rx_comp.correlator);
         /* do error checking */
         if (next->rx_comp.rc) {
             netdev_dbg(netdev, "rx buffer returned with rc %x\n",
                    be16_to_cpu(next->rx_comp.rc));
             /* free the entry */
             next->rx_comp.first = 0;
             dev_kfree_skb_any(rx_buff->skb);
             remove_buff_from_pool(adapter, rx_buff);
             continue;
         } else if (!rx_buff->skb) {
             /* free the entry */
             next->rx_comp.first = 0;
             remove_buff_from_pool(adapter, rx_buff);
             continue;
         }
 
         length = be32_to_cpu(next->rx_comp.len);
         offset = be16_to_cpu(next->rx_comp.off_frame_data);
         flags = next->rx_comp.flags;
         skb = rx_buff->skb;
         /* load long_term_buff before copying to skb */
         dma_rmb();
         skb_copy_to_linear_data(skb, rx_buff->data + offset,
                     length);
 
         /* VLAN Header has been stripped by the system firmware and
          * needs to be inserted by the driver
          */
         if (adapter->rx_vlan_header_insertion &&
             (flags & IBMVNIC_VLAN_STRIPPED))
             __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
                            ntohs(next->rx_comp.vlan_tci));
 
         /* free the entry */
         next->rx_comp.first = 0;
         remove_buff_from_pool(adapter, rx_buff);
 
         skb_put(skb, length);
         skb->protocol = eth_type_trans(skb, netdev);
         skb_record_rx_queue(skb, scrq_num);
 
         if (flags & IBMVNIC_IP_CHKSUM_GOOD &&
             flags & IBMVNIC_TCP_UDP_CHKSUM_GOOD) {
             skb->ip_summed = CHECKSUM_UNNECESSARY;
         }
 
         length = skb->len;
         napi_gro_receive(napi, skb); /* send it up */
         netdev->stats.rx_packets++;
         netdev->stats.rx_bytes += length;
         adapter->rx_stats_buffers[scrq_num].packets++;
         adapter->rx_stats_buffers[scrq_num].bytes += length;
         frames_processed++;
     }
 
     if (adapter->state != VNIC_CLOSING &&
         ((atomic_read(&adapter->rx_pool[scrq_num].available) <
           adapter->req_rx_add_entries_per_subcrq / 2) ||
           frames_processed < budget))
         replenish_rx_pool(adapter, &adapter->rx_pool[scrq_num]);
     if (frames_processed < budget) {
         if (napi_complete_done(napi, frames_processed)) {
             enable_scrq_irq(adapter, rx_scrq);
             if (pending_scrq(adapter, rx_scrq)) {
                 if (napi_reschedule(napi)) {
                     disable_scrq_irq(adapter, rx_scrq);
                     goto restart_poll;
                 }
             }
         }
     }
     return frames_processed;
 }
 
 static int wait_for_reset(struct ibmvnic_adapter *adapter)
 {
     int rc, ret;
 
     adapter->fallback.mtu = adapter->req_mtu;
     adapter->fallback.rx_queues = adapter->req_rx_queues;
     adapter->fallback.tx_queues = adapter->req_tx_queues;
     adapter->fallback.rx_entries = adapter->req_rx_add_entries_per_subcrq;
     adapter->fallback.tx_entries = adapter->req_tx_entries_per_subcrq;
 
     reinit_completion(&adapter->reset_done);
     adapter->wait_for_reset = true;
     rc = ibmvnic_reset(adapter, VNIC_RESET_CHANGE_PARAM);
 
     if (rc) {
         ret = rc;
         goto out;
     }
     rc = ibmvnic_wait_for_completion(adapter, &adapter->reset_done, 60000);
     if (rc) {
         ret = -ENODEV;
         goto out;
     }
 
     ret = 0;
     if (adapter->reset_done_rc) {
         ret = -EIO;
         adapter->desired.mtu = adapter->fallback.mtu;
         adapter->desired.rx_queues = adapter->fallback.rx_queues;
         adapter->desired.tx_queues = adapter->fallback.tx_queues;
         adapter->desired.rx_entries = adapter->fallback.rx_entries;
         adapter->desired.tx_entries = adapter->fallback.tx_entries;
 
         reinit_completion(&adapter->reset_done);
         adapter->wait_for_reset = true;
         rc = ibmvnic_reset(adapter, VNIC_RESET_CHANGE_PARAM);
         if (rc) {
             ret = rc;
             goto out;
         }
         rc = ibmvnic_wait_for_completion(adapter, &adapter->reset_done,
                          60000);
         if (rc) {
             ret = -ENODEV;
             goto out;
         }
     }
 out:
     adapter->wait_for_reset = false;
 
     return ret;
 }
 
 static int ibmvnic_change_mtu(struct net_device *netdev, int new_mtu)
 {
     struct ibmvnic_adapter *adapter = netdev_priv(netdev);
 
     adapter->desired.mtu = new_mtu + ETH_HLEN;
 
     return wait_for_reset(adapter);
 }
 
 static netdev_features_t ibmvnic_features_check(struct sk_buff *skb,
                         struct net_device *dev,
                         netdev_features_t features)
 {
     /* Some backing hardware adapters can not
      * handle packets with a MSS less than 224
      * or with only one segment.
      */
     if (skb_is_gso(skb)) {
         if (skb_shinfo(skb)->gso_size < 224 ||
             skb_shinfo(skb)->gso_segs == 1)
             features &= ~NETIF_F_GSO_MASK;
     }
 
     return features;
 }
 
 static const struct net_device_ops ibmvnic_netdev_ops = {
     .ndo_open       = ibmvnic_open,
     .ndo_stop       = ibmvnic_close,
     .ndo_start_xmit     = ibmvnic_xmit,
     .ndo_set_rx_mode    = ibmvnic_set_multi,
     .ndo_set_mac_address    = ibmvnic_set_mac,
     .ndo_validate_addr  = eth_validate_addr,
     .ndo_tx_timeout     = ibmvnic_tx_timeout,
     .ndo_change_mtu     = ibmvnic_change_mtu,
     .ndo_features_check     = ibmvnic_features_check,
 };
 
 /* ethtool functions */
 
 static int ibmvnic_get_link_ksettings(struct net_device *netdev,
                       struct ethtool_link_ksettings *cmd)
 {
     struct ibmvnic_adapter *adapter = netdev_priv(netdev);
     int rc;
 
     rc = send_query_phys_parms(adapter);
     if (rc) {
         adapter->speed = SPEED_UNKNOWN;
         adapter->duplex = DUPLEX_UNKNOWN;
     }
     cmd->base.speed = adapter->speed;
     cmd->base.duplex = adapter->duplex;
     cmd->base.port = PORT_FIBRE;
     cmd->base.phy_address = 0;
     cmd->base.autoneg = AUTONEG_ENABLE;
 
     return 0;
 }
 
 static void ibmvnic_get_drvinfo(struct net_device *netdev,
                 struct ethtool_drvinfo *info)
 {
     struct ibmvnic_adapter *adapter = netdev_priv(netdev);
 
     strscpy(info->driver, ibmvnic_driver_name, sizeof(info->driver));
     strscpy(info->version, IBMVNIC_DRIVER_VERSION, sizeof(info->version));
     strscpy(info->fw_version, adapter->fw_version,
         sizeof(info->fw_version));
 }
 
 static u32 ibmvnic_get_msglevel(struct net_device *netdev)
 {
     struct ibmvnic_adapter *adapter = netdev_priv(netdev);
 
     return adapter->msg_enable;
 }
 
 static void ibmvnic_set_msglevel(struct net_device *netdev, u32 data)
 {
     struct ibmvnic_adapter *adapter = netdev_priv(netdev);
 
     adapter->msg_enable = data;
 }
 
 static u32 ibmvnic_get_link(struct net_device *netdev)
 {
     struct ibmvnic_adapter *adapter = netdev_priv(netdev);
 
     /* Don't need to send a query because we request a logical link up at
      * init and then we wait for link state indications
      */
     return adapter->logical_link_state;
 }
 
 static void ibmvnic_get_ringparam(struct net_device *netdev,
                   struct ethtool_ringparam *ring,
                   struct kernel_ethtool_ringparam *kernel_ring,
                   struct netlink_ext_ack *extack)
 {
     struct ibmvnic_adapter *adapter = netdev_priv(netdev);
 
     ring->rx_max_pending = adapter->max_rx_add_entries_per_subcrq;
     ring->tx_max_pending = adapter->max_tx_entries_per_subcrq;
     ring->rx_mini_max_pending = 0;
     ring->rx_jumbo_max_pending = 0;
     ring->rx_pending = adapter->req_rx_add_entries_per_subcrq;
     ring->tx_pending = adapter->req_tx_entries_per_subcrq;
     ring->rx_mini_pending = 0;
     ring->rx_jumbo_pending = 0;
 }
 
 static int ibmvnic_set_ringparam(struct net_device *netdev,
                  struct ethtool_ringparam *ring,
                  struct kernel_ethtool_ringparam *kernel_ring,
                  struct netlink_ext_ack *extack)
 {
     struct ibmvnic_adapter *adapter = netdev_priv(netdev);
 
     if (ring->rx_pending > adapter->max_rx_add_entries_per_subcrq  ||
         ring->tx_pending > adapter->max_tx_entries_per_subcrq) {
         netdev_err(netdev, "Invalid request.\n");
         netdev_err(netdev, "Max tx buffers = %llu\n",
                adapter->max_rx_add_entries_per_subcrq);
         netdev_err(netdev, "Max rx buffers = %llu\n",
                adapter->max_tx_entries_per_subcrq);
         return -EINVAL;
     }
 
     adapter->desired.rx_entries = ring->rx_pending;
     adapter->desired.tx_entries = ring->tx_pending;
 
     return wait_for_reset(adapter);
 }
 
 static void ibmvnic_get_channels(struct net_device *netdev,
                  struct ethtool_channels *channels)
 {
     struct ibmvnic_adapter *adapter = netdev_priv(netdev);
 
     channels->max_rx = adapter->max_rx_queues;
     channels->max_tx = adapter->max_tx_queues;
     channels->max_other = 0;
     channels->max_combined = 0;
     channels->rx_count = adapter->req_rx_queues;
     channels->tx_count = adapter->req_tx_queues;
     channels->other_count = 0;
     channels->combined_count = 0;
 }
 
 static int ibmvnic_set_channels(struct net_device *netdev,
                 struct ethtool_channels *channels)
 {
     struct ibmvnic_adapter *adapter = netdev_priv(netdev);
 
     adapter->desired.rx_queues = channels->rx_count;
     adapter->desired.tx_queues = channels->tx_count;
 
     return wait_for_reset(adapter);
 }
 
 static void ibmvnic_get_strings(struct net_device *dev, u32 stringset, u8 *data)
 {
     struct ibmvnic_adapter *adapter = netdev_priv(dev);
     int i;
 
     if (stringset != ETH_SS_STATS)
         return;
 
     for (i = 0; i < ARRAY_SIZE(ibmvnic_stats); i++, data += ETH_GSTRING_LEN)
         memcpy(data, ibmvnic_stats[i].name, ETH_GSTRING_LEN);
 
     for (i = 0; i < adapter->req_tx_queues; i++) {
         snprintf(data, ETH_GSTRING_LEN, "tx%d_packets", i);
         data += ETH_GSTRING_LEN;
 
         snprintf(data, ETH_GSTRING_LEN, "tx%d_bytes", i);
         data += ETH_GSTRING_LEN;
 
         snprintf(data, ETH_GSTRING_LEN, "tx%d_dropped_packets", i);
         data += ETH_GSTRING_LEN;
     }
 
     for (i = 0; i < adapter->req_rx_queues; i++) {
         snprintf(data, ETH_GSTRING_LEN, "rx%d_packets", i);
         data += ETH_GSTRING_LEN;
 
         snprintf(data, ETH_GSTRING_LEN, "rx%d_bytes", i);
         data += ETH_GSTRING_LEN;
 
         snprintf(data, ETH_GSTRING_LEN, "rx%d_interrupts", i);
         data += ETH_GSTRING_LEN;
     }
 }
 
 static int ibmvnic_get_sset_count(struct net_device *dev, int sset)
 {
     struct ibmvnic_adapter *adapter = netdev_priv(dev);
 
     switch (sset) {
     case ETH_SS_STATS:
         return ARRAY_SIZE(ibmvnic_stats) +
                adapter->req_tx_queues * NUM_TX_STATS +
                adapter->req_rx_queues * NUM_RX_STATS;
     default:
         return -EOPNOTSUPP;
     }
 }
 
 static void ibmvnic_get_ethtool_stats(struct net_device *dev,
                       struct ethtool_stats *stats, u64 *data)
 {
     struct ibmvnic_adapter *adapter = netdev_priv(dev);
     union ibmvnic_crq crq;
     int i, j;
     int rc;
 
     memset(&crq, 0, sizeof(crq));
     crq.request_statistics.first = IBMVNIC_CRQ_CMD;
     crq.request_statistics.cmd = REQUEST_STATISTICS;
     crq.request_statistics.ioba = cpu_to_be32(adapter->stats_token);
     crq.request_statistics.len =
         cpu_to_be32(sizeof(struct ibmvnic_statistics));
 
     /* Wait for data to be written */
     reinit_completion(&adapter->stats_done);
     rc = ibmvnic_send_crq(adapter, &crq);
     if (rc)
         return;
     rc = ibmvnic_wait_for_completion(adapter, &adapter->stats_done, 10000);
     if (rc)
         return;
 
     for (i = 0; i < ARRAY_SIZE(ibmvnic_stats); i++)
         data[i] = be64_to_cpu(IBMVNIC_GET_STAT
                       (adapter, ibmvnic_stats[i].offset));
 
     for (j = 0; j < adapter->req_tx_queues; j++) {
         data[i] = adapter->tx_stats_buffers[j].packets;
         i++;
         data[i] = adapter->tx_stats_buffers[j].bytes;
         i++;
         data[i] = adapter->tx_stats_buffers[j].dropped_packets;
         i++;
     }
 
     for (j = 0; j < adapter->req_rx_queues; j++) {
         data[i] = adapter->rx_stats_buffers[j].packets;
         i++;
         data[i] = adapter->rx_stats_buffers[j].bytes;
         i++;
         data[i] = adapter->rx_stats_buffers[j].interrupts;
         i++;
     }
 }
 
 static const struct ethtool_ops ibmvnic_ethtool_ops = {
     .get_drvinfo        = ibmvnic_get_drvinfo,
     .get_msglevel       = ibmvnic_get_msglevel,
     .set_msglevel       = ibmvnic_set_msglevel,
     .get_link       = ibmvnic_get_link,
     .get_ringparam      = ibmvnic_get_ringparam,
     .set_ringparam      = ibmvnic_set_ringparam,
     .get_channels       = ibmvnic_get_channels,
     .set_channels       = ibmvnic_set_channels,
     .get_strings            = ibmvnic_get_strings,
     .get_sset_count         = ibmvnic_get_sset_count,
     .get_ethtool_stats  = ibmvnic_get_ethtool_stats,
     .get_link_ksettings = ibmvnic_get_link_ksettings,
 };
 
 /* Routines for managing CRQs/sCRQs  */
 
 static int reset_one_sub_crq_queue(struct ibmvnic_adapter *adapter,
                    struct ibmvnic_sub_crq_queue *scrq)
 {
     int rc;
 
     if (!scrq) {
         netdev_dbg(adapter->netdev, "Invalid scrq reset.\n");
         return -EINVAL;
     }
 
     if (scrq->irq) {
         free_irq(scrq->irq, scrq);
         irq_dispose_mapping(scrq->irq);
         scrq->irq = 0;
     }
 
     if (scrq->msgs) {
         memset(scrq->msgs, 0, 4 * PAGE_SIZE);
         atomic_set(&scrq->used, 0);
         scrq->cur = 0;
         scrq->ind_buf.index = 0;
     } else {
         netdev_dbg(adapter->netdev, "Invalid scrq reset\n");
         return -EINVAL;
     }
 
     rc = h_reg_sub_crq(adapter->vdev->unit_address, scrq->msg_token,
                4 * PAGE_SIZE, &scrq->crq_num, &scrq->hw_irq);
     return rc;
 }
 
 static int reset_sub_crq_queues(struct ibmvnic_adapter *adapter)
 {
     int i, rc;
 
     if (!adapter->tx_scrq || !adapter->rx_scrq)
         return -EINVAL;
 
     for (i = 0; i < adapter->req_tx_queues; i++) {
         netdev_dbg(adapter->netdev, "Re-setting tx_scrq[%d]\n", i);
         rc = reset_one_sub_crq_queue(adapter, adapter->tx_scrq[i]);
         if (rc)
             return rc;
     }
 
     for (i = 0; i < adapter->req_rx_queues; i++) {
         netdev_dbg(adapter->netdev, "Re-setting rx_scrq[%d]\n", i);
         rc = reset_one_sub_crq_queue(adapter, adapter->rx_scrq[i]);
         if (rc)
             return rc;
     }
 
     return rc;
 }
 
 static void release_sub_crq_queue(struct ibmvnic_adapter *adapter,
                   struct ibmvnic_sub_crq_queue *scrq,
                   bool do_h_free)
 {
     struct device *dev = &adapter->vdev->dev;
     long rc;
 
     netdev_dbg(adapter->netdev, "Releasing sub-CRQ\n");
 
     if (do_h_free) {
         /* Close the sub-crqs */
         do {
             rc = plpar_hcall_norets(H_FREE_SUB_CRQ,
                         adapter->vdev->unit_address,
                         scrq->crq_num);
         } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
 
         if (rc) {
             netdev_err(adapter->netdev,
                    "Failed to release sub-CRQ %16lx, rc = %ld\n",
                    scrq->crq_num, rc);
         }
     }
 
     dma_free_coherent(dev,
               IBMVNIC_IND_ARR_SZ,
               scrq->ind_buf.indir_arr,
               scrq->ind_buf.indir_dma);
 
     dma_unmap_single(dev, scrq->msg_token, 4 * PAGE_SIZE,
              DMA_BIDIRECTIONAL);
     free_pages((unsigned long)scrq->msgs, 2);
     kfree(scrq);
 }
 
 static struct ibmvnic_sub_crq_queue *init_sub_crq_queue(struct ibmvnic_adapter
                             *adapter)
 {
     struct device *dev = &adapter->vdev->dev;
     struct ibmvnic_sub_crq_queue *scrq;
     int rc;
 
     scrq = kzalloc(sizeof(*scrq), GFP_KERNEL);
     if (!scrq)
         return NULL;
 
     scrq->msgs =
         (union sub_crq *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, 2);
     if (!scrq->msgs) {
         dev_warn(dev, "Couldn't allocate crq queue messages page\n");
         goto zero_page_failed;
     }
 
     scrq->msg_token = dma_map_single(dev, scrq->msgs, 4 * PAGE_SIZE,
                      DMA_BIDIRECTIONAL);
     if (dma_mapping_error(dev, scrq->msg_token)) {
         dev_warn(dev, "Couldn't map crq queue messages page\n");
         goto map_failed;
     }
 
     rc = h_reg_sub_crq(adapter->vdev->unit_address, scrq->msg_token,
                4 * PAGE_SIZE, &scrq->crq_num, &scrq->hw_irq);
 
     if (rc == H_RESOURCE)
         rc = ibmvnic_reset_crq(adapter);
 
     if (rc == H_CLOSED) {
         dev_warn(dev, "Partner adapter not ready, waiting.\n");
     } else if (rc) {
         dev_warn(dev, "Error %d registering sub-crq\n", rc);
         goto reg_failed;
     }
 
     scrq->adapter = adapter;
     scrq->size = 4 * PAGE_SIZE / sizeof(*scrq->msgs);
     scrq->ind_buf.index = 0;
 
     scrq->ind_buf.indir_arr =
         dma_alloc_coherent(dev,
                    IBMVNIC_IND_ARR_SZ,
                    &scrq->ind_buf.indir_dma,
                    GFP_KERNEL);
 
     if (!scrq->ind_buf.indir_arr)
         goto indir_failed;
 
     spin_lock_init(&scrq->lock);
 
     netdev_dbg(adapter->netdev,
            "sub-crq initialized, num %lx, hw_irq=%lx, irq=%x\n",
            scrq->crq_num, scrq->hw_irq, scrq->irq);
 
     return scrq;
 
 indir_failed:
     do {
         rc = plpar_hcall_norets(H_FREE_SUB_CRQ,
                     adapter->vdev->unit_address,
                     scrq->crq_num);
     } while (rc == H_BUSY || rc == H_IS_LONG_BUSY(rc));
 reg_failed:
     dma_unmap_single(dev, scrq->msg_token, 4 * PAGE_SIZE,
              DMA_BIDIRECTIONAL);
 map_failed:
     free_pages((unsigned long)scrq->msgs, 2);
 zero_page_failed:
     kfree(scrq);
 
     return NULL;
 }
 
 static void release_sub_crqs(struct ibmvnic_adapter *adapter, bool do_h_free)
 {
     int i;
 
     if (adapter->tx_scrq) {
         for (i = 0; i < adapter->num_active_tx_scrqs; i++) {
             if (!adapter->tx_scrq[i])
                 continue;
 
             netdev_dbg(adapter->netdev, "Releasing tx_scrq[%d]\n",
                    i);
             ibmvnic_tx_scrq_clean_buffer(adapter, adapter->tx_scrq[i]);
             if (adapter->tx_scrq[i]->irq) {
                 free_irq(adapter->tx_scrq[i]->irq,
                      adapter->tx_scrq[i]);
                 irq_dispose_mapping(adapter->tx_scrq[i]->irq);
                 adapter->tx_scrq[i]->irq = 0;
             }
 
             release_sub_crq_queue(adapter, adapter->tx_scrq[i],
                           do_h_free);
         }
 
         kfree(adapter->tx_scrq);
         adapter->tx_scrq = NULL;
         adapter->num_active_tx_scrqs = 0;
     }
 
     if (adapter->rx_scrq) {
         for (i = 0; i < adapter->num_active_rx_scrqs; i++) {
             if (!adapter->rx_scrq[i])
                 continue;
 
             netdev_dbg(adapter->netdev, "Releasing rx_scrq[%d]\n",
                    i);
             if (adapter->rx_scrq[i]->irq) {
                 free_irq(adapter->rx_scrq[i]->irq,
                      adapter->rx_scrq[i]);
                 irq_dispose_mapping(adapter->rx_scrq[i]->irq);
                 adapter->rx_scrq[i]->irq = 0;
             }
 
             release_sub_crq_queue(adapter, adapter->rx_scrq[i],
                           do_h_free);
         }
 
         kfree(adapter->rx_scrq);
         adapter->rx_scrq = NULL;
         adapter->num_active_rx_scrqs = 0;
     }
 }
 
 static int disable_scrq_irq(struct ibmvnic_adapter *adapter,
                 struct ibmvnic_sub_crq_queue *scrq)
 {
     struct device *dev = &adapter->vdev->dev;
     unsigned long rc;
 
     rc = plpar_hcall_norets(H_VIOCTL, adapter->vdev->unit_address,
                 H_DISABLE_VIO_INTERRUPT, scrq->hw_irq, 0, 0);
     if (rc)
         dev_err(dev, "Couldn't disable scrq irq 0x%lx. rc=%ld\n",
             scrq->hw_irq, rc);
     return rc;
 }
 
 /* We can not use the IRQ chip EOI handler because that has the
  * unintended effect of changing the interrupt priority.
  */
 static void ibmvnic_xics_eoi(struct device *dev, struct ibmvnic_sub_crq_queue *scrq)
 {
     u64 val = 0xff000000 | scrq->hw_irq;
     unsigned long rc;
 
     rc = plpar_hcall_norets(H_EOI, val);
     if (rc)
         dev_err(dev, "H_EOI FAILED irq 0x%llx. rc=%ld\n", val, rc);
 }
 
 /* Due to a firmware bug, the hypervisor can send an interrupt to a
  * transmit or receive queue just prior to a partition migration.
  * Force an EOI after migration.
  */
 static void ibmvnic_clear_pending_interrupt(struct device *dev,
                         struct ibmvnic_sub_crq_queue *scrq)
 {
     if (!xive_enabled())
         ibmvnic_xics_eoi(dev, scrq);
 }
 
 static int enable_scrq_irq(struct ibmvnic_adapter *adapter,
                struct ibmvnic_sub_crq_queue *scrq)
 {
     struct device *dev = &adapter->vdev->dev;
     unsigned long rc;
 
     if (scrq->hw_irq > 0x100000000ULL) {
         dev_err(dev, "bad hw_irq = %lx\n", scrq->hw_irq);
         return 1;
     }
 
     if (test_bit(0, &adapter->resetting) &&
         adapter->reset_reason == VNIC_RESET_MOBILITY) {
         ibmvnic_clear_pending_interrupt(dev, scrq);
     }
 
     rc = plpar_hcall_norets(H_VIOCTL, adapter->vdev->unit_address,
                 H_ENABLE_VIO_INTERRUPT, scrq->hw_irq, 0, 0);
     if (rc)
         dev_err(dev, "Couldn't enable scrq irq 0x%lx. rc=%ld\n",
             scrq->hw_irq, rc);
     return rc;
 }
 
 static int ibmvnic_complete_tx(struct ibmvnic_adapter *adapter,
                    struct ibmvnic_sub_crq_queue *scrq)
 {
     struct device *dev = &adapter->vdev->dev;
     struct ibmvnic_tx_pool *tx_pool;
     struct ibmvnic_tx_buff *txbuff;
     struct netdev_queue *txq;
     union sub_crq *next;
     int index;
     int i;
 
 restart_loop:
     while (pending_scrq(adapter, scrq)) {
         unsigned int pool = scrq->pool_index;
         int num_entries = 0;
         int total_bytes = 0;
         int num_packets = 0;
 
         next = ibmvnic_next_scrq(adapter, scrq);
         for (i = 0; i < next->tx_comp.num_comps; i++) {
             index = be32_to_cpu(next->tx_comp.correlators[i]);
             if (index & IBMVNIC_TSO_POOL_MASK) {
                 tx_pool = &adapter->tso_pool[pool];
                 index &= ~IBMVNIC_TSO_POOL_MASK;
             } else {
                 tx_pool = &adapter->tx_pool[pool];
             }
 
             txbuff = &tx_pool->tx_buff[index];
             num_packets++;
             num_entries += txbuff->num_entries;
             if (txbuff->skb) {
                 total_bytes += txbuff->skb->len;
                 if (next->tx_comp.rcs[i]) {
                     dev_err(dev, "tx error %x\n",
                         next->tx_comp.rcs[i]);
                     dev_kfree_skb_irq(txbuff->skb);
                 } else {
                     dev_consume_skb_irq(txbuff->skb);
                 }
                 txbuff->skb = NULL;
             } else {
                 netdev_warn(adapter->netdev,
                         "TX completion received with NULL socket buffer\n");
             }
             tx_pool->free_map[tx_pool->producer_index] = index;
             tx_pool->producer_index =
                 (tx_pool->producer_index + 1) %
                     tx_pool->num_buffers;
         }
         /* remove tx_comp scrq*/
         next->tx_comp.first = 0;
 
         txq = netdev_get_tx_queue(adapter->netdev, scrq->pool_index);
         netdev_tx_completed_queue(txq, num_packets, total_bytes);
 
         if (atomic_sub_return(num_entries, &scrq->used) <=
             (adapter->req_tx_entries_per_subcrq / 2) &&
             __netif_subqueue_stopped(adapter->netdev,
                          scrq->pool_index)) {
             rcu_read_lock();
             if (adapter->tx_queues_active) {
                 netif_wake_subqueue(adapter->netdev,
                             scrq->pool_index);
                 netdev_dbg(adapter->netdev,
                        "Started queue %d\n",
                        scrq->pool_index);
             }
             rcu_read_unlock();
         }
     }
 
     enable_scrq_irq(adapter, scrq);
 
     if (pending_scrq(adapter, scrq)) {
         disable_scrq_irq(adapter, scrq);
         goto restart_loop;
     }
 
     return 0;
 }
 
 static irqreturn_t ibmvnic_interrupt_tx(int irq, void *instance)
 {
     struct ibmvnic_sub_crq_queue *scrq = instance;
     struct ibmvnic_adapter *adapter = scrq->adapter;
 
     disable_scrq_irq(adapter, scrq);
     ibmvnic_complete_tx(adapter, scrq);
 
     return IRQ_HANDLED;
 }
 
 static irqreturn_t ibmvnic_interrupt_rx(int irq, void *instance)
 {
     struct ibmvnic_sub_crq_queue *scrq = instance;
     struct ibmvnic_adapter *adapter = scrq->adapter;
 
     /* When booting a kdump kernel we can hit pending interrupts
      * prior to completing driver initialization.
      */
     if (unlikely(adapter->state != VNIC_OPEN))
         return IRQ_NONE;
 
     adapter->rx_stats_buffers[scrq->scrq_num].interrupts++;
 
     if (napi_schedule_prep(&adapter->napi[scrq->scrq_num])) {
         disable_scrq_irq(adapter, scrq);
         __napi_schedule(&adapter->napi[scrq->scrq_num]);
     }
 
     return IRQ_HANDLED;
 }
 
 static int init_sub_crq_irqs(struct ibmvnic_adapter *adapter)
 {
     struct device *dev = &adapter->vdev->dev;
     struct ibmvnic_sub_crq_queue *scrq;
     int i = 0, j = 0;
     int rc = 0;
 
     for (i = 0; i < adapter->req_tx_queues; i++) {
         netdev_dbg(adapter->netdev, "Initializing tx_scrq[%d] irq\n",
                i);
         scrq = adapter->tx_scrq[i];
         scrq->irq = irq_create_mapping(NULL, scrq->hw_irq);
 
         if (!scrq->irq) {
             rc = -EINVAL;
             dev_err(dev, "Error mapping irq\n");
             goto req_tx_irq_failed;
         }
 
         snprintf(scrq->name, sizeof(scrq->name), "ibmvnic-%x-tx%d",
              adapter->vdev->unit_address, i);
         rc = request_irq(scrq->irq, ibmvnic_interrupt_tx,
                  0, scrq->name, scrq);
 
         if (rc) {
             dev_err(dev, "Couldn't register tx irq 0x%x. rc=%d\n",
                 scrq->irq, rc);
             irq_dispose_mapping(scrq->irq);
             goto req_tx_irq_failed;
         }
     }
 
     for (i = 0; i < adapter->req_rx_queues; i++) {
         netdev_dbg(adapter->netdev, "Initializing rx_scrq[%d] irq\n",
                i);
         scrq = adapter->rx_scrq[i];
         scrq->irq = irq_create_mapping(NULL, scrq->hw_irq);
         if (!scrq->irq) {
             rc = -EINVAL;
             dev_err(dev, "Error mapping irq\n");
             goto req_rx_irq_failed;
         }
         snprintf(scrq->name, sizeof(scrq->name), "ibmvnic-%x-rx%d",
              adapter->vdev->unit_address, i);
         rc = request_irq(scrq->irq, ibmvnic_interrupt_rx,
                  0, scrq->name, scrq);
         if (rc) {
             dev_err(dev, "Couldn't register rx irq 0x%x. rc=%d\n",
                 scrq->irq, rc);
             irq_dispose_mapping(scrq->irq);
             goto req_rx_irq_failed;
         }
     }
     return rc;
 
 req_rx_irq_failed:
     for (j = 0; j < i; j++) {
         free_irq(adapter->rx_scrq[j]->irq, adapter->rx_scrq[j]);
         irq_dispose_mapping(adapter->rx_scrq[j]->irq);
     }
     i = adapter->req_tx_queues;
 req_tx_irq_failed:
     for (j = 0; j < i; j++) {
         free_irq(adapter->tx_scrq[j]->irq, adapter->tx_scrq[j]);
         irq_dispose_mapping(adapter->tx_scrq[j]->irq);
     }
     release_sub_crqs(adapter, 1);
     return rc;
 }
 
 static int init_sub_crqs(struct ibmvnic_adapter *adapter)
 {
     struct device *dev = &adapter->vdev->dev;
     struct ibmvnic_sub_crq_queue **allqueues;
     int registered_queues = 0;
     int total_queues;
     int more = 0;
     int i;
 
     total_queues = adapter->req_tx_queues + adapter->req_rx_queues;
 
     allqueues = kcalloc(total_queues, sizeof(*allqueues), GFP_KERNEL);
     if (!allqueues)
         return -ENOMEM;
 
     for (i = 0; i < total_queues; i++) {
         allqueues[i] = init_sub_crq_queue(adapter);
         if (!allqueues[i]) {
             dev_warn(dev, "Couldn't allocate all sub-crqs\n");
             break;
         }
         registered_queues++;
     }
 
     /* Make sure we were able to register the minimum number of queues */
     if (registered_queues <
         adapter->min_tx_queues + adapter->min_rx_queues) {
         dev_err(dev, "Fatal: Couldn't init  min number of sub-crqs\n");
         goto tx_failed;
     }
 
     /* Distribute the failed allocated queues*/
     for (i = 0; i < total_queues - registered_queues + more ; i++) {
         netdev_dbg(adapter->netdev, "Reducing number of queues\n");
         switch (i % 3) {
         case 0:
             if (adapter->req_rx_queues > adapter->min_rx_queues)
                 adapter->req_rx_queues--;
             else
                 more++;
             break;
         case 1:
             if (adapter->req_tx_queues > adapter->min_tx_queues)
                 adapter->req_tx_queues--;
             else
                 more++;
             break;
         }
     }
 
     adapter->tx_scrq = kcalloc(adapter->req_tx_queues,
                    sizeof(*adapter->tx_scrq), GFP_KERNEL);
     if (!adapter->tx_scrq)
         goto tx_failed;
 
     for (i = 0; i < adapter->req_tx_queues; i++) {
         adapter->tx_scrq[i] = allqueues[i];
         adapter->tx_scrq[i]->pool_index = i;
         adapter->num_active_tx_scrqs++;
     }
 
     adapter->rx_scrq = kcalloc(adapter->req_rx_queues,
                    sizeof(*adapter->rx_scrq), GFP_KERNEL);
     if (!adapter->rx_scrq)
         goto rx_failed;
 
     for (i = 0; i < adapter->req_rx_queues; i++) {
         adapter->rx_scrq[i] = allqueues[i + adapter->req_tx_queues];
         adapter->rx_scrq[i]->scrq_num = i;
         adapter->num_active_rx_scrqs++;
     }
 
     kfree(allqueues);
     return 0;
 
 rx_failed:
     kfree(adapter->tx_scrq);
     adapter->tx_scrq = NULL;
 tx_failed:
     for (i = 0; i < registered_queues; i++)
         release_sub_crq_queue(adapter, allqueues[i], 1);
     kfree(allqueues);
     return -ENOMEM;
 }
 
 static void send_request_cap(struct ibmvnic_adapter *adapter, int retry)
 {
     struct device *dev = &adapter->vdev->dev;
     union ibmvnic_crq crq;
     int max_entries;
     int cap_reqs;
 
     /* We send out 6 or 7 REQUEST_CAPABILITY CRQs below (depending on
      * the PROMISC flag). Initialize this count upfront. When the tasklet
      * receives a response to all of these, it will send the next protocol
      * message (QUERY_IP_OFFLOAD).
      */
     if (!(adapter->netdev->flags & IFF_PROMISC) ||
         adapter->promisc_supported)
         cap_reqs = 7;
     else
         cap_reqs = 6;
 
     if (!retry) {
         /* Sub-CRQ entries are 32 byte long */
         int entries_page = 4 * PAGE_SIZE / (sizeof(u64) * 4);
 
         atomic_set(&adapter->running_cap_crqs, cap_reqs);
 
         if (adapter->min_tx_entries_per_subcrq > entries_page ||
             adapter->min_rx_add_entries_per_subcrq > entries_page) {
             dev_err(dev, "Fatal, invalid entries per sub-crq\n");
             return;
         }
 
         if (adapter->desired.mtu)
             adapter->req_mtu = adapter->desired.mtu;
         else
             adapter->req_mtu = adapter->netdev->mtu + ETH_HLEN;
 
         if (!adapter->desired.tx_entries)
             adapter->desired.tx_entries =
                     adapter->max_tx_entries_per_subcrq;
         if (!adapter->desired.rx_entries)
             adapter->desired.rx_entries =
                     adapter->max_rx_add_entries_per_subcrq;
 
         max_entries = IBMVNIC_LTB_SET_SIZE /
                   (adapter->req_mtu + IBMVNIC_BUFFER_HLEN);
 
         if ((adapter->req_mtu + IBMVNIC_BUFFER_HLEN) *
             adapter->desired.tx_entries > IBMVNIC_LTB_SET_SIZE) {
             adapter->desired.tx_entries = max_entries;
         }
 
         if ((adapter->req_mtu + IBMVNIC_BUFFER_HLEN) *
             adapter->desired.rx_entries > IBMVNIC_LTB_SET_SIZE) {
             adapter->desired.rx_entries = max_entries;
         }
 
         if (adapter->desired.tx_entries)
             adapter->req_tx_entries_per_subcrq =
                     adapter->desired.tx_entries;
         else
             adapter->req_tx_entries_per_subcrq =
                     adapter->max_tx_entries_per_subcrq;
 
         if (adapter->desired.rx_entries)
             adapter->req_rx_add_entries_per_subcrq =
                     adapter->desired.rx_entries;
         else
             adapter->req_rx_add_entries_per_subcrq =
                     adapter->max_rx_add_entries_per_subcrq;
 
         if (adapter->desired.tx_queues)
             adapter->req_tx_queues =
                     adapter->desired.tx_queues;
         else
             adapter->req_tx_queues =
                     adapter->opt_tx_comp_sub_queues;
 
         if (adapter->desired.rx_queues)
             adapter->req_rx_queues =
                     adapter->desired.rx_queues;
         else
             adapter->req_rx_queues =
                     adapter->opt_rx_comp_queues;
 
         adapter->req_rx_add_queues = adapter->max_rx_add_queues;
     } else {
         atomic_add(cap_reqs, &adapter->running_cap_crqs);
     }
     memset(&crq, 0, sizeof(crq));
     crq.request_capability.first = IBMVNIC_CRQ_CMD;
     crq.request_capability.cmd = REQUEST_CAPABILITY;
 
     crq.request_capability.capability = cpu_to_be16(REQ_TX_QUEUES);
     crq.request_capability.number = cpu_to_be64(adapter->req_tx_queues);
     cap_reqs--;
     ibmvnic_send_crq(adapter, &crq);
 
     crq.request_capability.capability = cpu_to_be16(REQ_RX_QUEUES);
     crq.request_capability.number = cpu_to_be64(adapter->req_rx_queues);
     cap_reqs--;
     ibmvnic_send_crq(adapter, &crq);
 
     crq.request_capability.capability = cpu_to_be16(REQ_RX_ADD_QUEUES);
     crq.request_capability.number = cpu_to_be64(adapter->req_rx_add_queues);
     cap_reqs--;
     ibmvnic_send_crq(adapter, &crq);
 
     crq.request_capability.capability =
         cpu_to_be16(REQ_TX_ENTRIES_PER_SUBCRQ);
     crq.request_capability.number =
         cpu_to_be64(adapter->req_tx_entries_per_subcrq);
     cap_reqs--;
     ibmvnic_send_crq(adapter, &crq);
 
     crq.request_capability.capability =
         cpu_to_be16(REQ_RX_ADD_ENTRIES_PER_SUBCRQ);
     crq.request_capability.number =
         cpu_to_be64(adapter->req_rx_add_entries_per_subcrq);
     cap_reqs--;
     ibmvnic_send_crq(adapter, &crq);
 
     crq.request_capability.capability = cpu_to_be16(REQ_MTU);
     crq.request_capability.number = cpu_to_be64(adapter->req_mtu);
     cap_reqs--;
     ibmvnic_send_crq(adapter, &crq);
 
     if (adapter->netdev->flags & IFF_PROMISC) {
         if (adapter->promisc_supported) {
             crq.request_capability.capability =
                 cpu_to_be16(PROMISC_REQUESTED);
             crq.request_capability.number = cpu_to_be64(1);
             cap_reqs--;
             ibmvnic_send_crq(adapter, &crq);
         }
     } else {
         crq.request_capability.capability =
             cpu_to_be16(PROMISC_REQUESTED);
         crq.request_capability.number = cpu_to_be64(0);
         cap_reqs--;
         ibmvnic_send_crq(adapter, &crq);
     }
 
     /* Keep at end to catch any discrepancy between expected and actual
      * CRQs sent.
      */
     WARN_ON(cap_reqs != 0);
 }
 
 static int pending_scrq(struct ibmvnic_adapter *adapter,
             struct ibmvnic_sub_crq_queue *scrq)
 {
     union sub_crq *entry = &scrq->msgs[scrq->cur];
     int rc;
 
     rc = !!(entry->generic.first & IBMVNIC_CRQ_CMD_RSP);
 
     /* Ensure that the SCRQ valid flag is loaded prior to loading the
      * contents of the SCRQ descriptor
      */
     dma_rmb();
 
     return rc;
 }
 
 static union sub_crq *ibmvnic_next_scrq(struct ibmvnic_adapter *adapter,
                     struct ibmvnic_sub_crq_queue *scrq)
 {
     union sub_crq *entry;
     unsigned long flags;
 
     spin_lock_irqsave(&scrq->lock, flags);
     entry = &scrq->msgs[scrq->cur];
     if (entry->generic.first & IBMVNIC_CRQ_CMD_RSP) {
         if (++scrq->cur == scrq->size)
             scrq->cur = 0;
     } else {
         entry = NULL;
     }
     spin_unlock_irqrestore(&scrq->lock, flags);
 
     /* Ensure that the SCRQ valid flag is loaded prior to loading the
      * contents of the SCRQ descriptor
      */
     dma_rmb();
 
     return entry;
 }
 
 static union ibmvnic_crq *ibmvnic_next_crq(struct ibmvnic_adapter *adapter)
 {
     struct ibmvnic_crq_queue *queue = &adapter->crq;
     union ibmvnic_crq *crq;
 
     crq = &queue->msgs[queue->cur];
     if (crq->generic.first & IBMVNIC_CRQ_CMD_RSP) {
         if (++queue->cur == queue->size)
             queue->cur = 0;
     } else {
         crq = NULL;
     }
 
     return crq;
 }
 
 static void print_subcrq_error(struct device *dev, int rc, const char *func)
 {
     switch (rc) {
     case H_PARAMETER:
         dev_warn_ratelimited(dev,
                      "%s failed: Send request is malformed or adapter failover pending. (rc=%d)\n",
                      func, rc);
         break;
     case H_CLOSED:
         dev_warn_ratelimited(dev,
                      "%s failed: Backing queue closed. Adapter is down or failover pending. (rc=%d)\n",
                      func, rc);
         break;
     default:
         dev_err_ratelimited(dev, "%s failed: (rc=%d)\n", func, rc);
         break;
     }
 }
 
 static int send_subcrq_indirect(struct ibmvnic_adapter *adapter,
                 u64 remote_handle, u64 ioba, u64 num_entries)
 {
     unsigned int ua = adapter->vdev->unit_address;
     struct device *dev = &adapter->vdev->dev;
     int rc;
 
     /* Make sure the hypervisor sees the complete request */
     dma_wmb();
     rc = plpar_hcall_norets(H_SEND_SUB_CRQ_INDIRECT, ua,
                 cpu_to_be64(remote_handle),
                 ioba, num_entries);
 
     if (rc)
         print_subcrq_error(dev, rc, __func__);
 
     return rc;
 }
 
 static int ibmvnic_send_crq(struct ibmvnic_adapter *adapter,
                 union ibmvnic_crq *crq)
 {
     unsigned int ua = adapter->vdev->unit_address;
     struct device *dev = &adapter->vdev->dev;
     u64 *u64_crq = (u64 *)crq;
     int rc;
 
     netdev_dbg(adapter->netdev, "Sending CRQ: %016lx %016lx\n",
            (unsigned long)cpu_to_be64(u64_crq[0]),
            (unsigned long)cpu_to_be64(u64_crq[1]));
 
     if (!adapter->crq.active &&
         crq->generic.first != IBMVNIC_CRQ_INIT_CMD) {
         dev_warn(dev, "Invalid request detected while CRQ is inactive, possible device state change during reset\n");
         return -EINVAL;
     }
 
     /* Make sure the hypervisor sees the complete request */
     dma_wmb();
 
     rc = plpar_hcall_norets(H_SEND_CRQ, ua,
                 cpu_to_be64(u64_crq[0]),
                 cpu_to_be64(u64_crq[1]));
 
     if (rc) {
         if (rc == H_CLOSED) {
             dev_warn(dev, "CRQ Queue closed\n");
             /* do not reset, report the fail, wait for passive init from server */
         }
 
         dev_warn(dev, "Send error (rc=%d)\n", rc);
     }
 
     return rc;
 }
 
 static int ibmvnic_send_crq_init(struct ibmvnic_adapter *adapter)
 {
     struct device *dev = &adapter->vdev->dev;
     union ibmvnic_crq crq;
     int retries = 100;
     int rc;
 
     memset(&crq, 0, sizeof(crq));
     crq.generic.first = IBMVNIC_CRQ_INIT_CMD;
     crq.generic.cmd = IBMVNIC_CRQ_INIT;
     netdev_dbg(adapter->netdev, "Sending CRQ init\n");
 
     do {
         rc = ibmvnic_send_crq(adapter, &crq);
         if (rc != H_CLOSED)
             break;
         retries--;
         msleep(50);
 
     } while (retries > 0);
 
     if (rc) {
         dev_err(dev, "Failed to send init request, rc = %d\n", rc);
         return rc;
     }
 
     return 0;
 }
 
 struct vnic_login_client_data {
     u8  type;
     __be16  len;
     char    name[];
 } __packed;
 
 static int vnic_client_data_len(struct ibmvnic_adapter *adapter)
 {
     int len;
 
     /* Calculate the amount of buffer space needed for the
      * vnic client data in the login buffer. There are four entries,
      * OS name, LPAR name, device name, and a null last entry.
      */
     len = 4 * sizeof(struct vnic_login_client_data);
     len += 6; /* "Linux" plus NULL */
     len += strlen(utsname()->nodename) + 1;
     len += strlen(adapter->netdev->name) + 1;
 
     return len;
 }
 
 static void vnic_add_client_data(struct ibmvnic_adapter *adapter,
                  struct vnic_login_client_data *vlcd)
 {
     const char *os_name = "Linux";
     int len;
 
     /* Type 1 - LPAR OS */
     vlcd->type = 1;
     len = strlen(os_name) + 1;
     vlcd->len = cpu_to_be16(len);
     strscpy(vlcd->name, os_name, len);
     vlcd = (struct vnic_login_client_data *)(vlcd->name + len);
 
     /* Type 2 - LPAR name */
     vlcd->type = 2;
     len = strlen(utsname()->nodename) + 1;
     vlcd->len = cpu_to_be16(len);
     strscpy(vlcd->name, utsname()->nodename, len);
     vlcd = (struct vnic_login_client_data *)(vlcd->name + len);
 
     /* Type 3 - device name */
     vlcd->type = 3;
     len = strlen(adapter->netdev->name) + 1;
     vlcd->len = cpu_to_be16(len);
     strscpy(vlcd->name, adapter->netdev->name, len);
 }
 
 static int send_login(struct ibmvnic_adapter *adapter)
 {
     struct ibmvnic_login_rsp_buffer *login_rsp_buffer;
     struct ibmvnic_login_buffer *login_buffer;
     struct device *dev = &adapter->vdev->dev;
     struct vnic_login_client_data *vlcd;
     dma_addr_t rsp_buffer_token;
     dma_addr_t buffer_token;
     size_t rsp_buffer_size;
     union ibmvnic_crq crq;
     int client_data_len;
     size_t buffer_size;
     __be64 *tx_list_p;
     __be64 *rx_list_p;
     int rc;
     int i;
 
     if (!adapter->tx_scrq || !adapter->rx_scrq) {
         netdev_err(adapter->netdev,
                "RX or TX queues are not allocated, device login failed\n");
         return -ENOMEM;
     }
 
     release_login_buffer(adapter);
     release_login_rsp_buffer(adapter);
 
     client_data_len = vnic_client_data_len(adapter);
 
     buffer_size =
         sizeof(struct ibmvnic_login_buffer) +
         sizeof(u64) * (adapter->req_tx_queues + adapter->req_rx_queues) +
         client_data_len;
 
     login_buffer = kzalloc(buffer_size, GFP_ATOMIC);
     if (!login_buffer)
         goto buf_alloc_failed;
 
     buffer_token = dma_map_single(dev, login_buffer, buffer_size,
                       DMA_TO_DEVICE);
     if (dma_mapping_error(dev, buffer_token)) {
         dev_err(dev, "Couldn't map login buffer\n");
         goto buf_map_failed;
     }
 
     rsp_buffer_size = sizeof(struct ibmvnic_login_rsp_buffer) +
               sizeof(u64) * adapter->req_tx_queues +
               sizeof(u64) * adapter->req_rx_queues +
               sizeof(u64) * adapter->req_rx_queues +
               sizeof(u8) * IBMVNIC_TX_DESC_VERSIONS;
 
     login_rsp_buffer = kmalloc(rsp_buffer_size, GFP_ATOMIC);
     if (!login_rsp_buffer)
         goto buf_rsp_alloc_failed;
 
     rsp_buffer_token = dma_map_single(dev, login_rsp_buffer,
                       rsp_buffer_size, DMA_FROM_DEVICE);
     if (dma_mapping_error(dev, rsp_buffer_token)) {
         dev_err(dev, "Couldn't map login rsp buffer\n");
         goto buf_rsp_map_failed;
     }
 
     adapter->login_buf = login_buffer;
     adapter->login_buf_token = buffer_token;
     adapter->login_buf_sz = buffer_size;
     adapter->login_rsp_buf = login_rsp_buffer;
     adapter->login_rsp_buf_token = rsp_buffer_token;
     adapter->login_rsp_buf_sz = rsp_buffer_size;
 
     login_buffer->len = cpu_to_be32(buffer_size);
     login_buffer->version = cpu_to_be32(INITIAL_VERSION_LB);
     login_buffer->num_txcomp_subcrqs = cpu_to_be32(adapter->req_tx_queues);
     login_buffer->off_txcomp_subcrqs =
         cpu_to_be32(sizeof(struct ibmvnic_login_buffer));
     login_buffer->num_rxcomp_subcrqs = cpu_to_be32(adapter->req_rx_queues);
     login_buffer->off_rxcomp_subcrqs =
         cpu_to_be32(sizeof(struct ibmvnic_login_buffer) +
             sizeof(u64) * adapter->req_tx_queues);
     login_buffer->login_rsp_ioba = cpu_to_be32(rsp_buffer_token);
     login_buffer->login_rsp_len = cpu_to_be32(rsp_buffer_size);
 
     tx_list_p = (__be64 *)((char *)login_buffer +
                       sizeof(struct ibmvnic_login_buffer));
     rx_list_p = (__be64 *)((char *)login_buffer +
                       sizeof(struct ibmvnic_login_buffer) +
                       sizeof(u64) * adapter->req_tx_queues);
 
     for (i = 0; i < adapter->req_tx_queues; i++) {
         if (adapter->tx_scrq[i]) {
             tx_list_p[i] =
                 cpu_to_be64(adapter->tx_scrq[i]->crq_num);
         }
     }
 
     for (i = 0; i < adapter->req_rx_queues; i++) {
         if (adapter->rx_scrq[i]) {
             rx_list_p[i] =
                 cpu_to_be64(adapter->rx_scrq[i]->crq_num);
         }
     }
 
     /* Insert vNIC login client data */
     vlcd = (struct vnic_login_client_data *)
         ((char *)rx_list_p + (sizeof(u64) * adapter->req_rx_queues));
     login_buffer->client_data_offset =
             cpu_to_be32((char *)vlcd - (char *)login_buffer);
     login_buffer->client_data_len = cpu_to_be32(client_data_len);
 
     vnic_add_client_data(adapter, vlcd);
 
     netdev_dbg(adapter->netdev, "Login Buffer:\n");
     for (i = 0; i < (adapter->login_buf_sz - 1) / 8 + 1; i++) {
         netdev_dbg(adapter->netdev, "%016lx\n",
                ((unsigned long *)(adapter->login_buf))[i]);
     }
 
     memset(&crq, 0, sizeof(crq));
     crq.login.first = IBMVNIC_CRQ_CMD;
     crq.login.cmd = LOGIN;
     crq.login.ioba = cpu_to_be32(buffer_token);
     crq.login.len = cpu_to_be32(buffer_size);
 
     adapter->login_pending = true;
     rc = ibmvnic_send_crq(adapter, &crq);
     if (rc) {
         adapter->login_pending = false;
         netdev_err(adapter->netdev, "Failed to send login, rc=%d\n", rc);
         goto buf_rsp_map_failed;
     }
 
     return 0;
 
 buf_rsp_map_failed:
     kfree(login_rsp_buffer);
     adapter->login_rsp_buf = NULL;
 buf_rsp_alloc_failed:
     dma_unmap_single(dev, buffer_token, buffer_size, DMA_TO_DEVICE);
 buf_map_failed:
     kfree(login_buffer);
     adapter->login_buf = NULL;
 buf_alloc_failed:
     return -ENOMEM;
 }
 
 static int send_request_map(struct ibmvnic_adapter *adapter, dma_addr_t addr,
                 u32 len, u8 map_id)
 {
     union ibmvnic_crq crq;
 
     memset(&crq, 0, sizeof(crq));
     crq.request_map.first = IBMVNIC_CRQ_CMD;
     crq.request_map.cmd = REQUEST_MAP;
     crq.request_map.map_id = map_id;
     crq.request_map.ioba = cpu_to_be32(addr);
     crq.request_map.len = cpu_to_be32(len);
     return ibmvnic_send_crq(adapter, &crq);
 }
 
 static int send_request_unmap(struct ibmvnic_adapter *adapter, u8 map_id)
 {
     union ibmvnic_crq crq;
 
     memset(&crq, 0, sizeof(crq));
     crq.request_unmap.first = IBMVNIC_CRQ_CMD;
     crq.request_unmap.cmd = REQUEST_UNMAP;
     crq.request_unmap.map_id = map_id;
     return ibmvnic_send_crq(adapter, &crq);
 }
 
 static void send_query_map(struct ibmvnic_adapter *adapter)
 {
     union ibmvnic_crq crq;
 
     memset(&crq, 0, sizeof(crq));
     crq.query_map.first = IBMVNIC_CRQ_CMD;
     crq.query_map.cmd = QUERY_MAP;
     ibmvnic_send_crq(adapter, &crq);
 }
 
 /* Send a series of CRQs requesting various capabilities of the VNIC server */
 static void send_query_cap(struct ibmvnic_adapter *adapter)
 {
     union ibmvnic_crq crq;
     int cap_reqs;
 
     /* We send out 25 QUERY_CAPABILITY CRQs below.  Initialize this count
      * upfront. When the tasklet receives a response to all of these, it
      * can send out the next protocol messaage (REQUEST_CAPABILITY).
      */
     cap_reqs = 25;
 
     atomic_set(&adapter->running_cap_crqs, cap_reqs);
 
     memset(&crq, 0, sizeof(crq));
     crq.query_capability.first = IBMVNIC_CRQ_CMD;
     crq.query_capability.cmd = QUERY_CAPABILITY;
 
     crq.query_capability.capability = cpu_to_be16(MIN_TX_QUEUES);
     ibmvnic_send_crq(adapter, &crq);
     cap_reqs--;
 
     crq.query_capability.capability = cpu_to_be16(MIN_RX_QUEUES);
     ibmvnic_send_crq(adapter, &crq);
     cap_reqs--;
 
     crq.query_capability.capability = cpu_to_be16(MIN_RX_ADD_QUEUES);
     ibmvnic_send_crq(adapter, &crq);
     cap_reqs--;
 
     crq.query_capability.capability = cpu_to_be16(MAX_TX_QUEUES);
     ibmvnic_send_crq(adapter, &crq);
     cap_reqs--;
 
     crq.query_capability.capability = cpu_to_be16(MAX_RX_QUEUES);
     ibmvnic_send_crq(adapter, &crq);
     cap_reqs--;
 
     crq.query_capability.capability = cpu_to_be16(MAX_RX_ADD_QUEUES);
     ibmvnic_send_crq(adapter, &crq);
     cap_reqs--;
 
     crq.query_capability.capability =
         cpu_to_be16(MIN_TX_ENTRIES_PER_SUBCRQ);
     ibmvnic_send_crq(adapter, &crq);
     cap_reqs--;
 
     crq.query_capability.capability =
         cpu_to_be16(MIN_RX_ADD_ENTRIES_PER_SUBCRQ);
     ibmvnic_send_crq(adapter, &crq);
     cap_reqs--;
 
     crq.query_capability.capability =
         cpu_to_be16(MAX_TX_ENTRIES_PER_SUBCRQ);
     ibmvnic_send_crq(adapter, &crq);
     cap_reqs--;
 
     crq.query_capability.capability =
         cpu_to_be16(MAX_RX_ADD_ENTRIES_PER_SUBCRQ);
     ibmvnic_send_crq(adapter, &crq);
     cap_reqs--;
 
     crq.query_capability.capability = cpu_to_be16(TCP_IP_OFFLOAD);
     ibmvnic_send_crq(adapter, &crq);
     cap_reqs--;
 
     crq.query_capability.capability = cpu_to_be16(PROMISC_SUPPORTED);
     ibmvnic_send_crq(adapter, &crq);
     cap_reqs--;
 
     crq.query_capability.capability = cpu_to_be16(MIN_MTU);
     ibmvnic_send_crq(adapter, &crq);
     cap_reqs--;
 
     crq.query_capability.capability = cpu_to_be16(MAX_MTU);
     ibmvnic_send_crq(adapter, &crq);
     cap_reqs--;
 
     crq.query_capability.capability = cpu_to_be16(MAX_MULTICAST_FILTERS);
     ibmvnic_send_crq(adapter, &crq);
     cap_reqs--;
 
     crq.query_capability.capability = cpu_to_be16(VLAN_HEADER_INSERTION);
     ibmvnic_send_crq(adapter, &crq);
     cap_reqs--;
 
     crq.query_capability.capability = cpu_to_be16(RX_VLAN_HEADER_INSERTION);
     ibmvnic_send_crq(adapter, &crq);
     cap_reqs--;
 
     crq.query_capability.capability = cpu_to_be16(MAX_TX_SG_ENTRIES);
     ibmvnic_send_crq(adapter, &crq);
     cap_reqs--;
 
     crq.query_capability.capability = cpu_to_be16(RX_SG_SUPPORTED);
     ibmvnic_send_crq(adapter, &crq);
     cap_reqs--;
 
     crq.query_capability.capability = cpu_to_be16(OPT_TX_COMP_SUB_QUEUES);
     ibmvnic_send_crq(adapter, &crq);
     cap_reqs--;
 
     crq.query_capability.capability = cpu_to_be16(OPT_RX_COMP_QUEUES);
     ibmvnic_send_crq(adapter, &crq);
     cap_reqs--;
 
     crq.query_capability.capability =
             cpu_to_be16(OPT_RX_BUFADD_Q_PER_RX_COMP_Q);
     ibmvnic_send_crq(adapter, &crq);
     cap_reqs--;
 
     crq.query_capability.capability =
             cpu_to_be16(OPT_TX_ENTRIES_PER_SUBCRQ);
     ibmvnic_send_crq(adapter, &crq);
     cap_reqs--;
 
     crq.query_capability.capability =
             cpu_to_be16(OPT_RXBA_ENTRIES_PER_SUBCRQ);
     ibmvnic_send_crq(adapter, &crq);
     cap_reqs--;
 
     crq.query_capability.capability = cpu_to_be16(TX_RX_DESC_REQ);
 
     ibmvnic_send_crq(adapter, &crq);
     cap_reqs--;
 
     /* Keep at end to catch any discrepancy between expected and actual
      * CRQs sent.
      */
     WARN_ON(cap_reqs != 0);
 }
 
 static void send_query_ip_offload(struct ibmvnic_adapter *adapter)
 {
     int buf_sz = sizeof(struct ibmvnic_query_ip_offload_buffer);
     struct device *dev = &adapter->vdev->dev;
     union ibmvnic_crq crq;
 
     adapter->ip_offload_tok =
         dma_map_single(dev,
                    &adapter->ip_offload_buf,
                    buf_sz,
                    DMA_FROM_DEVICE);
 
     if (dma_mapping_error(dev, adapter->ip_offload_tok)) {
         if (!firmware_has_feature(FW_FEATURE_CMO))
             dev_err(dev, "Couldn't map offload buffer\n");
         return;
     }
 
     memset(&crq, 0, sizeof(crq));
     crq.query_ip_offload.first = IBMVNIC_CRQ_CMD;
     crq.query_ip_offload.cmd = QUERY_IP_OFFLOAD;
     crq.query_ip_offload.len = cpu_to_be32(buf_sz);
     crq.query_ip_offload.ioba =
         cpu_to_be32(adapter->ip_offload_tok);
 
     ibmvnic_send_crq(adapter, &crq);
 }
 
 static void send_control_ip_offload(struct ibmvnic_adapter *adapter)
 {
     struct ibmvnic_control_ip_offload_buffer *ctrl_buf = &adapter->ip_offload_ctrl;
     struct ibmvnic_query_ip_offload_buffer *buf = &adapter->ip_offload_buf;
     struct device *dev = &adapter->vdev->dev;
     netdev_features_t old_hw_features = 0;
     union ibmvnic_crq crq;
 
     adapter->ip_offload_ctrl_tok =
         dma_map_single(dev,
                    ctrl_buf,
                    sizeof(adapter->ip_offload_ctrl),
                    DMA_TO_DEVICE);
 
     if (dma_mapping_error(dev, adapter->ip_offload_ctrl_tok)) {
         dev_err(dev, "Couldn't map ip offload control buffer\n");
         return;
     }
 
     ctrl_buf->len = cpu_to_be32(sizeof(adapter->ip_offload_ctrl));
     ctrl_buf->version = cpu_to_be32(INITIAL_VERSION_IOB);
     ctrl_buf->ipv4_chksum = buf->ipv4_chksum;
     ctrl_buf->ipv6_chksum = buf->ipv6_chksum;
     ctrl_buf->tcp_ipv4_chksum = buf->tcp_ipv4_chksum;
     ctrl_buf->udp_ipv4_chksum = buf->udp_ipv4_chksum;
     ctrl_buf->tcp_ipv6_chksum = buf->tcp_ipv6_chksum;
     ctrl_buf->udp_ipv6_chksum = buf->udp_ipv6_chksum;
     ctrl_buf->large_tx_ipv4 = buf->large_tx_ipv4;
     ctrl_buf->large_tx_ipv6 = buf->large_tx_ipv6;
 
     /* large_rx disabled for now, additional features needed */
     ctrl_buf->large_rx_ipv4 = 0;
     ctrl_buf->large_rx_ipv6 = 0;
 
     if (adapter->state != VNIC_PROBING) {
         old_hw_features = adapter->netdev->hw_features;
         adapter->netdev->hw_features = 0;
     }
 
     adapter->netdev->hw_features = NETIF_F_SG | NETIF_F_GSO | NETIF_F_GRO;
 
     if (buf->tcp_ipv4_chksum || buf->udp_ipv4_chksum)
         adapter->netdev->hw_features |= NETIF_F_IP_CSUM;
 
     if (buf->tcp_ipv6_chksum || buf->udp_ipv6_chksum)
         adapter->netdev->hw_features |= NETIF_F_IPV6_CSUM;
 
     if ((adapter->netdev->features &
         (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM)))
         adapter->netdev->hw_features |= NETIF_F_RXCSUM;
 
     if (buf->large_tx_ipv4)
         adapter->netdev->hw_features |= NETIF_F_TSO;
     if (buf->large_tx_ipv6)
         adapter->netdev->hw_features |= NETIF_F_TSO6;
 
     if (adapter->state == VNIC_PROBING) {
         adapter->netdev->features |= adapter->netdev->hw_features;
     } else if (old_hw_features != adapter->netdev->hw_features) {
         netdev_features_t tmp = 0;
 
         /* disable features no longer supported */
         adapter->netdev->features &= adapter->netdev->hw_features;
         /* turn on features now supported if previously enabled */
         tmp = (old_hw_features ^ adapter->netdev->hw_features) &
             adapter->netdev->hw_features;
         adapter->netdev->features |=
                 tmp & adapter->netdev->wanted_features;
     }
 
     memset(&crq, 0, sizeof(crq));
     crq.control_ip_offload.first = IBMVNIC_CRQ_CMD;
     crq.control_ip_offload.cmd = CONTROL_IP_OFFLOAD;
     crq.control_ip_offload.len =
         cpu_to_be32(sizeof(adapter->ip_offload_ctrl));
     crq.control_ip_offload.ioba = cpu_to_be32(adapter->ip_offload_ctrl_tok);
     ibmvnic_send_crq(adapter, &crq);
 }
 
 static void handle_vpd_size_rsp(union ibmvnic_crq *crq,
                 struct ibmvnic_adapter *adapter)
 {
     struct device *dev = &adapter->vdev->dev;
 
     if (crq->get_vpd_size_rsp.rc.code) {
         dev_err(dev, "Error retrieving VPD size, rc=%x\n",
             crq->get_vpd_size_rsp.rc.code);
         complete(&adapter->fw_done);
         return;
     }
 
     adapter->vpd->len = be64_to_cpu(crq->get_vpd_size_rsp.len);
     complete(&adapter->fw_done);
 }
 
 static void handle_vpd_rsp(union ibmvnic_crq *crq,
                struct ibmvnic_adapter *adapter)
 {
     struct device *dev = &adapter->vdev->dev;
     unsigned char *substr = NULL;
     u8 fw_level_len = 0;
 
     memset(adapter->fw_version, 0, 32);
 
     dma_unmap_single(dev, adapter->vpd->dma_addr, adapter->vpd->len,
              DMA_FROM_DEVICE);
 
     if (crq->get_vpd_rsp.rc.code) {
         dev_err(dev, "Error retrieving VPD from device, rc=%x\n",
             crq->get_vpd_rsp.rc.code);
         goto complete;
     }
 
     /* get the position of the firmware version info
      * located after the ASCII 'RM' substring in the buffer
      */
     substr = strnstr(adapter->vpd->buff, "RM", adapter->vpd->len);
     if (!substr) {
         dev_info(dev, "Warning - No FW level has been provided in the VPD buffer by the VIOS Server\n");
         goto complete;
     }
 
     /* get length of firmware level ASCII substring */
     if ((substr + 2) < (adapter->vpd->buff + adapter->vpd->len)) {
         fw_level_len = *(substr + 2);
     } else {
         dev_info(dev, "Length of FW substr extrapolated VDP buff\n");
         goto complete;
     }
 
     /* copy firmware version string from vpd into adapter */
     if ((substr + 3 + fw_level_len) <
         (adapter->vpd->buff + adapter->vpd->len)) {
         strncpy((char *)adapter->fw_version, substr + 3, fw_level_len);
     } else {
         dev_info(dev, "FW substr extrapolated VPD buff\n");
     }
 
 complete:
     if (adapter->fw_version[0] == '\0')
         strscpy((char *)adapter->fw_version, "N/A", sizeof(adapter->fw_version));
     complete(&adapter->fw_done);
 }
 
 static void handle_query_ip_offload_rsp(struct ibmvnic_adapter *adapter)
 {
     struct device *dev = &adapter->vdev->dev;
     struct ibmvnic_query_ip_offload_buffer *buf = &adapter->ip_offload_buf;
     int i;
 
     dma_unmap_single(dev, adapter->ip_offload_tok,
              sizeof(adapter->ip_offload_buf), DMA_FROM_DEVICE);
 
     netdev_dbg(adapter->netdev, "Query IP Offload Buffer:\n");
     for (i = 0; i < (sizeof(adapter->ip_offload_buf) - 1) / 8 + 1; i++)
         netdev_dbg(adapter->netdev, "%016lx\n",
                ((unsigned long *)(buf))[i]);
 
     netdev_dbg(adapter->netdev, "ipv4_chksum = %d\n", buf->ipv4_chksum);
     netdev_dbg(adapter->netdev, "ipv6_chksum = %d\n", buf->ipv6_chksum);
     netdev_dbg(adapter->netdev, "tcp_ipv4_chksum = %d\n",
            buf->tcp_ipv4_chksum);
     netdev_dbg(adapter->netdev, "tcp_ipv6_chksum = %d\n",
            buf->tcp_ipv6_chksum);
     netdev_dbg(adapter->netdev, "udp_ipv4_chksum = %d\n",
            buf->udp_ipv4_chksum);
     netdev_dbg(adapter->netdev, "udp_ipv6_chksum = %d\n",
            buf->udp_ipv6_chksum);
     netdev_dbg(adapter->netdev, "large_tx_ipv4 = %d\n",
            buf->large_tx_ipv4);
     netdev_dbg(adapter->netdev, "large_tx_ipv6 = %d\n",
            buf->large_tx_ipv6);
     netdev_dbg(adapter->netdev, "large_rx_ipv4 = %d\n",
            buf->large_rx_ipv4);
     netdev_dbg(adapter->netdev, "large_rx_ipv6 = %d\n",
            buf->large_rx_ipv6);
     netdev_dbg(adapter->netdev, "max_ipv4_hdr_sz = %d\n",
            buf->max_ipv4_header_size);
     netdev_dbg(adapter->netdev, "max_ipv6_hdr_sz = %d\n",
            buf->max_ipv6_header_size);
     netdev_dbg(adapter->netdev, "max_tcp_hdr_size = %d\n",
            buf->max_tcp_header_size);
     netdev_dbg(adapter->netdev, "max_udp_hdr_size = %d\n",
            buf->max_udp_header_size);
     netdev_dbg(adapter->netdev, "max_large_tx_size = %d\n",
            buf->max_large_tx_size);
     netdev_dbg(adapter->netdev, "max_large_rx_size = %d\n",
            buf->max_large_rx_size);
     netdev_dbg(adapter->netdev, "ipv6_ext_hdr = %d\n",
            buf->ipv6_extension_header);
     netdev_dbg(adapter->netdev, "tcp_pseudosum_req = %d\n",
            buf->tcp_pseudosum_req);
     netdev_dbg(adapter->netdev, "num_ipv6_ext_hd = %d\n",
            buf->num_ipv6_ext_headers);
     netdev_dbg(adapter->netdev, "off_ipv6_ext_hd = %d\n",
            buf->off_ipv6_ext_headers);
 
     send_control_ip_offload(adapter);
 }
 
 static const char *ibmvnic_fw_err_cause(u16 cause)
 {
     switch (cause) {
     case ADAPTER_PROBLEM:
         return "adapter problem";
     case BUS_PROBLEM:
         return "bus problem";
     case FW_PROBLEM:
         return "firmware problem";
     case DD_PROBLEM:
         return "device driver problem";
     case EEH_RECOVERY:
         return "EEH recovery";
     case FW_UPDATED:
         return "firmware updated";
     case LOW_MEMORY:
         return "low Memory";
     default:
         return "unknown";
     }
 }
 
 static void handle_error_indication(union ibmvnic_crq *crq,
                     struct ibmvnic_adapter *adapter)
 {
     struct device *dev = &adapter->vdev->dev;
     u16 cause;
 
     cause = be16_to_cpu(crq->error_indication.error_cause);
 
     dev_warn_ratelimited(dev,
                  "Firmware reports %serror, cause: %s. Starting recovery...\n",
                  crq->error_indication.flags
                 & IBMVNIC_FATAL_ERROR ? "FATAL " : "",
                  ibmvnic_fw_err_cause(cause));
 
     if (crq->error_indication.flags & IBMVNIC_FATAL_ERROR)
         ibmvnic_reset(adapter, VNIC_RESET_FATAL);
     else
         ibmvnic_reset(adapter, VNIC_RESET_NON_FATAL);
 }
 
 static int handle_change_mac_rsp(union ibmvnic_crq *crq,
                  struct ibmvnic_adapter *adapter)
 {
     struct net_device *netdev = adapter->netdev;
     struct device *dev = &adapter->vdev->dev;
     long rc;
 
     rc = crq->change_mac_addr_rsp.rc.code;
     if (rc) {
         dev_err(dev, "Error %ld in CHANGE_MAC_ADDR_RSP\n", rc);
         goto out;
     }
     /* crq->change_mac_addr.mac_addr is the requested one
      * crq->change_mac_addr_rsp.mac_addr is the returned valid one.
      */
     eth_hw_addr_set(netdev, &crq->change_mac_addr_rsp.mac_addr[0]);
     ether_addr_copy(adapter->mac_addr,
             &crq->change_mac_addr_rsp.mac_addr[0]);
 out:
     complete(&adapter->fw_done);
     return rc;
 }
 
 static void handle_request_cap_rsp(union ibmvnic_crq *crq,
                    struct ibmvnic_adapter *adapter)
 {
     struct device *dev = &adapter->vdev->dev;
     u64 *req_value;
     char *name;
 
     atomic_dec(&adapter->running_cap_crqs);
     netdev_dbg(adapter->netdev, "Outstanding request-caps: %d\n",
            atomic_read(&adapter->running_cap_crqs));
     switch (be16_to_cpu(crq->request_capability_rsp.capability)) {
     case REQ_TX_QUEUES:
         req_value = &adapter->req_tx_queues;
         name = "tx";
         break;
     case REQ_RX_QUEUES:
         req_value = &adapter->req_rx_queues;
         name = "rx";
         break;
     case REQ_RX_ADD_QUEUES:
         req_value = &adapter->req_rx_add_queues;
         name = "rx_add";
         break;
     case REQ_TX_ENTRIES_PER_SUBCRQ:
         req_value = &adapter->req_tx_entries_per_subcrq;
         name = "tx_entries_per_subcrq";
         break;
     case REQ_RX_ADD_ENTRIES_PER_SUBCRQ:
         req_value = &adapter->req_rx_add_entries_per_subcrq;
         name = "rx_add_entries_per_subcrq";
         break;
     case REQ_MTU:
         req_value = &adapter->req_mtu;
         name = "mtu";
         break;
     case PROMISC_REQUESTED:
         req_value = &adapter->promisc;
         name = "promisc";
         break;
     default:
         dev_err(dev, "Got invalid cap request rsp %d\n",
             crq->request_capability.capability);
         return;
     }
 
     switch (crq->request_capability_rsp.rc.code) {
     case SUCCESS:
         break;
     case PARTIALSUCCESS:
         dev_info(dev, "req=%lld, rsp=%ld in %s queue, retrying.\n",
              *req_value,
              (long)be64_to_cpu(crq->request_capability_rsp.number),
              name);
 
         if (be16_to_cpu(crq->request_capability_rsp.capability) ==
             REQ_MTU) {
             pr_err("mtu of %llu is not supported. Reverting.\n",
                    *req_value);
             *req_value = adapter->fallback.mtu;
         } else {
             *req_value =
                 be64_to_cpu(crq->request_capability_rsp.number);
         }
 
         send_request_cap(adapter, 1);
         return;
     default:
         dev_err(dev, "Error %d in request cap rsp\n",
             crq->request_capability_rsp.rc.code);
         return;
     }
 
     /* Done receiving requested capabilities, query IP offload support */
     if (atomic_read(&adapter->running_cap_crqs) == 0)
         send_query_ip_offload(adapter);
 }
 
 static int handle_login_rsp(union ibmvnic_crq *login_rsp_crq,
                 struct ibmvnic_adapter *adapter)
 {
     struct device *dev = &adapter->vdev->dev;
     struct net_device *netdev = adapter->netdev;
     struct ibmvnic_login_rsp_buffer *login_rsp = adapter->login_rsp_buf;
     struct ibmvnic_login_buffer *login = adapter->login_buf;
     u64 *tx_handle_array;
     u64 *rx_handle_array;
     int num_tx_pools;
     int num_rx_pools;
     u64 *size_array;
     int i;
 
     /* CHECK: Test/set of login_pending does not need to be atomic
      * because only ibmvnic_tasklet tests/clears this.
      */
     if (!adapter->login_pending) {
         netdev_warn(netdev, "Ignoring unexpected login response\n");
         return 0;
     }
     adapter->login_pending = false;
 
     dma_unmap_single(dev, adapter->login_buf_token, adapter->login_buf_sz,
              DMA_TO_DEVICE);
     dma_unmap_single(dev, adapter->login_rsp_buf_token,
              adapter->login_rsp_buf_sz, DMA_FROM_DEVICE);
 
     /* If the number of queues requested can't be allocated by the
      * server, the login response will return with code 1. We will need
      * to resend the login buffer with fewer queues requested.
      */
     if (login_rsp_crq->generic.rc.code) {
         adapter->init_done_rc = login_rsp_crq->generic.rc.code;
         complete(&adapter->init_done);
         return 0;
     }
 
     if (adapter->failover_pending) {
         adapter->init_done_rc = -EAGAIN;
         netdev_dbg(netdev, "Failover pending, ignoring login response\n");
         complete(&adapter->init_done);
         /* login response buffer will be released on reset */
         return 0;
     }
 
     netdev->mtu = adapter->req_mtu - ETH_HLEN;
 
     netdev_dbg(adapter->netdev, "Login Response Buffer:\n");
     for (i = 0; i < (adapter->login_rsp_buf_sz - 1) / 8 + 1; i++) {
         netdev_dbg(adapter->netdev, "%016lx\n",
                ((unsigned long *)(adapter->login_rsp_buf))[i]);
     }
 
     /* Sanity checks */
     if (login->num_txcomp_subcrqs != login_rsp->num_txsubm_subcrqs ||
         (be32_to_cpu(login->num_rxcomp_subcrqs) *
          adapter->req_rx_add_queues !=
          be32_to_cpu(login_rsp->num_rxadd_subcrqs))) {
         dev_err(dev, "FATAL: Inconsistent login and login rsp\n");
         ibmvnic_reset(adapter, VNIC_RESET_FATAL);
         return -EIO;
     }
     size_array = (u64 *)((u8 *)(adapter->login_rsp_buf) +
         be32_to_cpu(adapter->login_rsp_buf->off_rxadd_buff_size));
     /* variable buffer sizes are not supported, so just read the
      * first entry.
      */
     adapter->cur_rx_buf_sz = be64_to_cpu(size_array[0]);
 
     num_tx_pools = be32_to_cpu(adapter->login_rsp_buf->num_txsubm_subcrqs);
     num_rx_pools = be32_to_cpu(adapter->login_rsp_buf->num_rxadd_subcrqs);
 
     tx_handle_array = (u64 *)((u8 *)(adapter->login_rsp_buf) +
                   be32_to_cpu(adapter->login_rsp_buf->off_txsubm_subcrqs));
     rx_handle_array = (u64 *)((u8 *)(adapter->login_rsp_buf) +
                   be32_to_cpu(adapter->login_rsp_buf->off_rxadd_subcrqs));
 
     for (i = 0; i < num_tx_pools; i++)
         adapter->tx_scrq[i]->handle = tx_handle_array[i];
 
     for (i = 0; i < num_rx_pools; i++)
         adapter->rx_scrq[i]->handle = rx_handle_array[i];
 
     adapter->num_active_tx_scrqs = num_tx_pools;
     adapter->num_active_rx_scrqs = num_rx_pools;
     release_login_rsp_buffer(adapter);
     release_login_buffer(adapter);
     complete(&adapter->init_done);
 
     return 0;
 }
 
 static void handle_request_unmap_rsp(union ibmvnic_crq *crq,
                      struct ibmvnic_adapter *adapter)
 {
     struct device *dev = &adapter->vdev->dev;
     long rc;
 
     rc = crq->request_unmap_rsp.rc.code;
     if (rc)
         dev_err(dev, "Error %ld in REQUEST_UNMAP_RSP\n", rc);
 }
 
 static void handle_query_map_rsp(union ibmvnic_crq *crq,
                  struct ibmvnic_adapter *adapter)
 {
     struct net_device *netdev = adapter->netdev;
     struct device *dev = &adapter->vdev->dev;
     long rc;
 
     rc = crq->query_map_rsp.rc.code;
     if (rc) {
         dev_err(dev, "Error %ld in QUERY_MAP_RSP\n", rc);
         return;
     }
     netdev_dbg(netdev, "page_size = %d\ntot_pages = %u\nfree_pages = %u\n",
            crq->query_map_rsp.page_size,
            __be32_to_cpu(crq->query_map_rsp.tot_pages),
            __be32_to_cpu(crq->query_map_rsp.free_pages));
 }
 
 static void handle_query_cap_rsp(union ibmvnic_crq *crq,
                  struct ibmvnic_adapter *adapter)
 {
     struct net_device *netdev = adapter->netdev;
     struct device *dev = &adapter->vdev->dev;
     long rc;
 
     atomic_dec(&adapter->running_cap_crqs);
     netdev_dbg(netdev, "Outstanding queries: %d\n",
            atomic_read(&adapter->running_cap_crqs));
     rc = crq->query_capability.rc.code;
     if (rc) {
         dev_err(dev, "Error %ld in QUERY_CAP_RSP\n", rc);
         goto out;
     }
 
     switch (be16_to_cpu(crq->query_capability.capability)) {
     case MIN_TX_QUEUES:
         adapter->min_tx_queues =
             be64_to_cpu(crq->query_capability.number);
         netdev_dbg(netdev, "min_tx_queues = %lld\n",
                adapter->min_tx_queues);
         break;
     case MIN_RX_QUEUES:
         adapter->min_rx_queues =
             be64_to_cpu(crq->query_capability.number);
         netdev_dbg(netdev, "min_rx_queues = %lld\n",
                adapter->min_rx_queues);
         break;
     case MIN_RX_ADD_QUEUES:
         adapter->min_rx_add_queues =
             be64_to_cpu(crq->query_capability.number);
         netdev_dbg(netdev, "min_rx_add_queues = %lld\n",
                adapter->min_rx_add_queues);
         break;
     case MAX_TX_QUEUES:
         adapter->max_tx_queues =
             be64_to_cpu(crq->query_capability.number);
         netdev_dbg(netdev, "max_tx_queues = %lld\n",
                adapter->max_tx_queues);
         break;
     case MAX_RX_QUEUES:
         adapter->max_rx_queues =
             be64_to_cpu(crq->query_capability.number);
         netdev_dbg(netdev, "max_rx_queues = %lld\n",
                adapter->max_rx_queues);
         break;
     case MAX_RX_ADD_QUEUES:
         adapter->max_rx_add_queues =
             be64_to_cpu(crq->query_capability.number);
         netdev_dbg(netdev, "max_rx_add_queues = %lld\n",
                adapter->max_rx_add_queues);
         break;
     case MIN_TX_ENTRIES_PER_SUBCRQ:
         adapter->min_tx_entries_per_subcrq =
             be64_to_cpu(crq->query_capability.number);
         netdev_dbg(netdev, "min_tx_entries_per_subcrq = %lld\n",
                adapter->min_tx_entries_per_subcrq);
         break;
     case MIN_RX_ADD_ENTRIES_PER_SUBCRQ:
         adapter->min_rx_add_entries_per_subcrq =
             be64_to_cpu(crq->query_capability.number);
         netdev_dbg(netdev, "min_rx_add_entrs_per_subcrq = %lld\n",
                adapter->min_rx_add_entries_per_subcrq);
         break;
     case MAX_TX_ENTRIES_PER_SUBCRQ:
         adapter->max_tx_entries_per_subcrq =
             be64_to_cpu(crq->query_capability.number);
         netdev_dbg(netdev, "max_tx_entries_per_subcrq = %lld\n",
                adapter->max_tx_entries_per_subcrq);
         break;
     case MAX_RX_ADD_ENTRIES_PER_SUBCRQ:
         adapter->max_rx_add_entries_per_subcrq =
             be64_to_cpu(crq->query_capability.number);
         netdev_dbg(netdev, "max_rx_add_entrs_per_subcrq = %lld\n",
                adapter->max_rx_add_entries_per_subcrq);
         break;
     case TCP_IP_OFFLOAD:
         adapter->tcp_ip_offload =
             be64_to_cpu(crq->query_capability.number);
         netdev_dbg(netdev, "tcp_ip_offload = %lld\n",
                adapter->tcp_ip_offload);
         break;
     case PROMISC_SUPPORTED:
         adapter->promisc_supported =
             be64_to_cpu(crq->query_capability.number);
         netdev_dbg(netdev, "promisc_supported = %lld\n",
                adapter->promisc_supported);
         break;
     case MIN_MTU:
         adapter->min_mtu = be64_to_cpu(crq->query_capability.number);
         netdev->min_mtu = adapter->min_mtu - ETH_HLEN;
         netdev_dbg(netdev, "min_mtu = %lld\n", adapter->min_mtu);
         break;
     case MAX_MTU:
         adapter->max_mtu = be64_to_cpu(crq->query_capability.number);
         netdev->max_mtu = adapter->max_mtu - ETH_HLEN;
         netdev_dbg(netdev, "max_mtu = %lld\n", adapter->max_mtu);
         break;
     case MAX_MULTICAST_FILTERS:
         adapter->max_multicast_filters =
             be64_to_cpu(crq->query_capability.number);
         netdev_dbg(netdev, "max_multicast_filters = %lld\n",
                adapter->max_multicast_filters);
         break;
     case VLAN_HEADER_INSERTION:
         adapter->vlan_header_insertion =
             be64_to_cpu(crq->query_capability.number);
         if (adapter->vlan_header_insertion)
             netdev->features |= NETIF_F_HW_VLAN_STAG_TX;
         netdev_dbg(netdev, "vlan_header_insertion = %lld\n",
                adapter->vlan_header_insertion);
         break;
     case RX_VLAN_HEADER_INSERTION:
         adapter->rx_vlan_header_insertion =
             be64_to_cpu(crq->query_capability.number);
         netdev_dbg(netdev, "rx_vlan_header_insertion = %lld\n",
                adapter->rx_vlan_header_insertion);
         break;
     case MAX_TX_SG_ENTRIES:
         adapter->max_tx_sg_entries =
             be64_to_cpu(crq->query_capability.number);
         netdev_dbg(netdev, "max_tx_sg_entries = %lld\n",
                adapter->max_tx_sg_entries);
         break;
     case RX_SG_SUPPORTED:
         adapter->rx_sg_supported =
             be64_to_cpu(crq->query_capability.number);
         netdev_dbg(netdev, "rx_sg_supported = %lld\n",
                adapter->rx_sg_supported);
         break;
     case OPT_TX_COMP_SUB_QUEUES:
         adapter->opt_tx_comp_sub_queues =
             be64_to_cpu(crq->query_capability.number);
         netdev_dbg(netdev, "opt_tx_comp_sub_queues = %lld\n",
                adapter->opt_tx_comp_sub_queues);
         break;
     case OPT_RX_COMP_QUEUES:
         adapter->opt_rx_comp_queues =
             be64_to_cpu(crq->query_capability.number);
         netdev_dbg(netdev, "opt_rx_comp_queues = %lld\n",
                adapter->opt_rx_comp_queues);
         break;
     case OPT_RX_BUFADD_Q_PER_RX_COMP_Q:
         adapter->opt_rx_bufadd_q_per_rx_comp_q =
             be64_to_cpu(crq->query_capability.number);
         netdev_dbg(netdev, "opt_rx_bufadd_q_per_rx_comp_q = %lld\n",
                adapter->opt_rx_bufadd_q_per_rx_comp_q);
         break;
     case OPT_TX_ENTRIES_PER_SUBCRQ:
         adapter->opt_tx_entries_per_subcrq =
             be64_to_cpu(crq->query_capability.number);
         netdev_dbg(netdev, "opt_tx_entries_per_subcrq = %lld\n",
                adapter->opt_tx_entries_per_subcrq);
         break;
     case OPT_RXBA_ENTRIES_PER_SUBCRQ:
         adapter->opt_rxba_entries_per_subcrq =
             be64_to_cpu(crq->query_capability.number);
         netdev_dbg(netdev, "opt_rxba_entries_per_subcrq = %lld\n",
                adapter->opt_rxba_entries_per_subcrq);
         break;
     case TX_RX_DESC_REQ:
         adapter->tx_rx_desc_req = crq->query_capability.number;
         netdev_dbg(netdev, "tx_rx_desc_req = %llx\n",
                adapter->tx_rx_desc_req);
         break;
 
     default:
         netdev_err(netdev, "Got invalid cap rsp %d\n",
                crq->query_capability.capability);
     }
 
 out:
     if (atomic_read(&adapter->running_cap_crqs) == 0)
         send_request_cap(adapter, 0);
 }
 
 static int send_query_phys_parms(struct ibmvnic_adapter *adapter)
 {
     union ibmvnic_crq crq;
     int rc;
 
     memset(&crq, 0, sizeof(crq));
     crq.query_phys_parms.first = IBMVNIC_CRQ_CMD;
     crq.query_phys_parms.cmd = QUERY_PHYS_PARMS;
 
     mutex_lock(&adapter->fw_lock);
     adapter->fw_done_rc = 0;
     reinit_completion(&adapter->fw_done);
 
     rc = ibmvnic_send_crq(adapter, &crq);
     if (rc) {
         mutex_unlock(&adapter->fw_lock);
         return rc;
     }
 
     rc = ibmvnic_wait_for_completion(adapter, &adapter->fw_done, 10000);
     if (rc) {
         mutex_unlock(&adapter->fw_lock);
         return rc;
     }
 
     mutex_unlock(&adapter->fw_lock);
     return adapter->fw_done_rc ? -EIO : 0;
 }
 
 static int handle_query_phys_parms_rsp(union ibmvnic_crq *crq,
                        struct ibmvnic_adapter *adapter)
 {
     struct net_device *netdev = adapter->netdev;
     int rc;
     __be32 rspeed = cpu_to_be32(crq->query_phys_parms_rsp.speed);
 
     rc = crq->query_phys_parms_rsp.rc.code;
     if (rc) {
         netdev_err(netdev, "Error %d in QUERY_PHYS_PARMS\n", rc);
         return rc;
     }
     switch (rspeed) {
     case IBMVNIC_10MBPS:
         adapter->speed = SPEED_10;
         break;
     case IBMVNIC_100MBPS:
         adapter->speed = SPEED_100;
         break;
     case IBMVNIC_1GBPS:
         adapter->speed = SPEED_1000;
         break;
     case IBMVNIC_10GBPS:
         adapter->speed = SPEED_10000;
         break;
     case IBMVNIC_25GBPS:
         adapter->speed = SPEED_25000;
         break;
     case IBMVNIC_40GBPS:
         adapter->speed = SPEED_40000;
         break;
     case IBMVNIC_50GBPS:
         adapter->speed = SPEED_50000;
         break;
     case IBMVNIC_100GBPS:
         adapter->speed = SPEED_100000;
         break;
     case IBMVNIC_200GBPS:
         adapter->speed = SPEED_200000;
         break;
     default:
         if (netif_carrier_ok(netdev))
             netdev_warn(netdev, "Unknown speed 0x%08x\n", rspeed);
         adapter->speed = SPEED_UNKNOWN;
     }
     if (crq->query_phys_parms_rsp.flags1 & IBMVNIC_FULL_DUPLEX)
         adapter->duplex = DUPLEX_FULL;
     else if (crq->query_phys_parms_rsp.flags1 & IBMVNIC_HALF_DUPLEX)
         adapter->duplex = DUPLEX_HALF;
     else
         adapter->duplex = DUPLEX_UNKNOWN;
 
     return rc;
 }
 
 static void ibmvnic_handle_crq(union ibmvnic_crq *crq,
                    struct ibmvnic_adapter *adapter)
 {
     struct ibmvnic_generic_crq *gen_crq = &crq->generic;
     struct net_device *netdev = adapter->netdev;
     struct device *dev = &adapter->vdev->dev;
     u64 *u64_crq = (u64 *)crq;
     long rc;
 
     netdev_dbg(netdev, "Handling CRQ: %016lx %016lx\n",
            (unsigned long)cpu_to_be64(u64_crq[0]),
            (unsigned long)cpu_to_be64(u64_crq[1]));
     switch (gen_crq->first) {
     case IBMVNIC_CRQ_INIT_RSP:
         switch (gen_crq->cmd) {
         case IBMVNIC_CRQ_INIT:
             dev_info(dev, "Partner initialized\n");
             adapter->from_passive_init = true;
             /* Discard any stale login responses from prev reset.
              * CHECK: should we clear even on INIT_COMPLETE?
              */
             adapter->login_pending = false;
 
             if (adapter->state == VNIC_DOWN)
                 rc = ibmvnic_reset(adapter, VNIC_RESET_PASSIVE_INIT);
             else
                 rc = ibmvnic_reset(adapter, VNIC_RESET_FAILOVER);
 
             if (rc && rc != -EBUSY) {
                 /* We were unable to schedule the failover
                  * reset either because the adapter was still
                  * probing (eg: during kexec) or we could not
                  * allocate memory. Clear the failover_pending
                  * flag since no one else will. We ignore
                  * EBUSY because it means either FAILOVER reset
                  * is already scheduled or the adapter is
                  * being removed.
                  */
                 netdev_err(netdev,
                        "Error %ld scheduling failover reset\n",
                        rc);
                 adapter->failover_pending = false;
             }
 
             if (!completion_done(&adapter->init_done)) {
                 if (!adapter->init_done_rc)
                     adapter->init_done_rc = -EAGAIN;
                 complete(&adapter->init_done);
             }
 
             break;
         case IBMVNIC_CRQ_INIT_COMPLETE:
             dev_info(dev, "Partner initialization complete\n");
             adapter->crq.active = true;
             send_version_xchg(adapter);
             break;
         default:
             dev_err(dev, "Unknown crq cmd: %d\n", gen_crq->cmd);
         }
         return;
     case IBMVNIC_CRQ_XPORT_EVENT:
         netif_carrier_off(netdev);
         adapter->crq.active = false;
         /* terminate any thread waiting for a response
          * from the device
          */
         if (!completion_done(&adapter->fw_done)) {
             adapter->fw_done_rc = -EIO;
             complete(&adapter->fw_done);
         }
 
         /* if we got here during crq-init, retry crq-init */
         if (!completion_done(&adapter->init_done)) {
             adapter->init_done_rc = -EAGAIN;
             complete(&adapter->init_done);
         }
 
         if (!completion_done(&adapter->stats_done))
             complete(&adapter->stats_done);
         if (test_bit(0, &adapter->resetting))
             adapter->force_reset_recovery = true;
         if (gen_crq->cmd == IBMVNIC_PARTITION_MIGRATED) {
             dev_info(dev, "Migrated, re-enabling adapter\n");
             ibmvnic_reset(adapter, VNIC_RESET_MOBILITY);
         } else if (gen_crq->cmd == IBMVNIC_DEVICE_FAILOVER) {
             dev_info(dev, "Backing device failover detected\n");
             adapter->failover_pending = true;
         } else {
             /* The adapter lost the connection */
             dev_err(dev, "Virtual Adapter failed (rc=%d)\n",
                 gen_crq->cmd);
             ibmvnic_reset(adapter, VNIC_RESET_FATAL);
         }
         return;
     case IBMVNIC_CRQ_CMD_RSP:
         break;
     default:
         dev_err(dev, "Got an invalid msg type 0x%02x\n",
             gen_crq->first);
         return;
     }
 
     switch (gen_crq->cmd) {
     case VERSION_EXCHANGE_RSP:
         rc = crq->version_exchange_rsp.rc.code;
         if (rc) {
             dev_err(dev, "Error %ld in VERSION_EXCHG_RSP\n", rc);
             break;
         }
         ibmvnic_version =
                 be16_to_cpu(crq->version_exchange_rsp.version);
         dev_info(dev, "Partner protocol version is %d\n",
              ibmvnic_version);
         send_query_cap(adapter);
         break;
     case QUERY_CAPABILITY_RSP:
         handle_query_cap_rsp(crq, adapter);
         break;
     case QUERY_MAP_RSP:
         handle_query_map_rsp(crq, adapter);
         break;
     case REQUEST_MAP_RSP:
         adapter->fw_done_rc = crq->request_map_rsp.rc.code;
         complete(&adapter->fw_done);
         break;
     case REQUEST_UNMAP_RSP:
         handle_request_unmap_rsp(crq, adapter);
         break;
     case REQUEST_CAPABILITY_RSP:
         handle_request_cap_rsp(crq, adapter);
         break;
     case LOGIN_RSP:
         netdev_dbg(netdev, "Got Login Response\n");
         handle_login_rsp(crq, adapter);
         break;
     case LOGICAL_LINK_STATE_RSP:
         netdev_dbg(netdev,
                "Got Logical Link State Response, state: %d rc: %d\n",
                crq->logical_link_state_rsp.link_state,
                crq->logical_link_state_rsp.rc.code);
         adapter->logical_link_state =
             crq->logical_link_state_rsp.link_state;
         adapter->init_done_rc = crq->logical_link_state_rsp.rc.code;
         complete(&adapter->init_done);
         break;
     case LINK_STATE_INDICATION:
         netdev_dbg(netdev, "Got Logical Link State Indication\n");
         adapter->phys_link_state =
             crq->link_state_indication.phys_link_state;
         adapter->logical_link_state =
             crq->link_state_indication.logical_link_state;
         if (adapter->phys_link_state && adapter->logical_link_state)
             netif_carrier_on(netdev);
         else
             netif_carrier_off(netdev);
         break;
     case CHANGE_MAC_ADDR_RSP:
         netdev_dbg(netdev, "Got MAC address change Response\n");
         adapter->fw_done_rc = handle_change_mac_rsp(crq, adapter);
         break;
     case ERROR_INDICATION:
         netdev_dbg(netdev, "Got Error Indication\n");
         handle_error_indication(crq, adapter);
         break;
     case REQUEST_STATISTICS_RSP:
         netdev_dbg(netdev, "Got Statistics Response\n");
         complete(&adapter->stats_done);
         break;
     case QUERY_IP_OFFLOAD_RSP:
         netdev_dbg(netdev, "Got Query IP offload Response\n");
         handle_query_ip_offload_rsp(adapter);
         break;
     case MULTICAST_CTRL_RSP:
         netdev_dbg(netdev, "Got multicast control Response\n");
         break;
     case CONTROL_IP_OFFLOAD_RSP:
         netdev_dbg(netdev, "Got Control IP offload Response\n");
         dma_unmap_single(dev, adapter->ip_offload_ctrl_tok,
                  sizeof(adapter->ip_offload_ctrl),
                  DMA_TO_DEVICE);
         complete(&adapter->init_done);
         break;
     case COLLECT_FW_TRACE_RSP:
         netdev_dbg(netdev, "Got Collect firmware trace Response\n");
         complete(&adapter->fw_done);
         break;
     case GET_VPD_SIZE_RSP:
         handle_vpd_size_rsp(crq, adapter);
         break;
     case GET_VPD_RSP:
         handle_vpd_rsp(crq, adapter);
         break;
     case QUERY_PHYS_PARMS_RSP:
         adapter->fw_done_rc = handle_query_phys_parms_rsp(crq, adapter);
         complete(&adapter->fw_done);
         break;
     default:
         netdev_err(netdev, "Got an invalid cmd type 0x%02x\n",
                gen_crq->cmd);
     }
 }
 
 static irqreturn_t ibmvnic_interrupt(int irq, void *instance)
 {
     struct ibmvnic_adapter *adapter = instance;
 
     tasklet_schedule(&adapter->tasklet);
     return IRQ_HANDLED;
 }
 
 static void ibmvnic_tasklet(struct tasklet_struct *t)
 {
     struct ibmvnic_adapter *adapter = from_tasklet(adapter, t, tasklet);
     struct ibmvnic_crq_queue *queue = &adapter->crq;
     union ibmvnic_crq *crq;
     unsigned long flags;
 
     spin_lock_irqsave(&queue->lock, flags);
 
     /* Pull all the valid messages off the CRQ */
     while ((crq = ibmvnic_next_crq(adapter)) != NULL) {
         /* This barrier makes sure ibmvnic_next_crq()'s
          * crq->generic.first & IBMVNIC_CRQ_CMD_RSP is loaded
          * before ibmvnic_handle_crq()'s
          * switch(gen_crq->first) and switch(gen_crq->cmd).
          */
         dma_rmb();
         ibmvnic_handle_crq(crq, adapter);
         crq->generic.first = 0;
     }
 
     spin_unlock_irqrestore(&queue->lock, flags);
 }
 
 static int ibmvnic_reenable_crq_queue(struct ibmvnic_adapter *adapter)
 {
     struct vio_dev *vdev = adapter->vdev;
     int rc;
 
     do {
         rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address);
     } while (rc == H_IN_PROGRESS || rc == H_BUSY || H_IS_LONG_BUSY(rc));
 
     if (rc)
         dev_err(&vdev->dev, "Error enabling adapter (rc=%d)\n", rc);
 
     return rc;
 }
 
 static int ibmvnic_reset_crq(struct ibmvnic_adapter *adapter)
 {
     struct ibmvnic_crq_queue *crq = &adapter->crq;
     struct device *dev = &adapter->vdev->dev;
     struct vio_dev *vdev = adapter->vdev;
     int rc;
 
     /* Close the CRQ */
     do {
         rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
     } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
 
     /* Clean out the queue */
     if (!crq->msgs)
         return -EINVAL;
 
     memset(crq->msgs, 0, PAGE_SIZE);
     crq->cur = 0;
     crq->active = false;
 
     /* And re-open it again */
     rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
                 crq->msg_token, PAGE_SIZE);
 
     if (rc == H_CLOSED)
         /* Adapter is good, but other end is not ready */
         dev_warn(dev, "Partner adapter not ready\n");
     else if (rc != 0)
         dev_warn(dev, "Couldn't register crq (rc=%d)\n", rc);
 
     return rc;
 }
 
 static void release_crq_queue(struct ibmvnic_adapter *adapter)
 {
     struct ibmvnic_crq_queue *crq = &adapter->crq;
     struct vio_dev *vdev = adapter->vdev;
     long rc;
 
     if (!crq->msgs)
         return;
 
     netdev_dbg(adapter->netdev, "Releasing CRQ\n");
     free_irq(vdev->irq, adapter);
     tasklet_kill(&adapter->tasklet);
     do {
         rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
     } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
 
     dma_unmap_single(&vdev->dev, crq->msg_token, PAGE_SIZE,
              DMA_BIDIRECTIONAL);
     free_page((unsigned long)crq->msgs);
     crq->msgs = NULL;
     crq->active = false;
 }
 
 static int init_crq_queue(struct ibmvnic_adapter *adapter)
 {
     struct ibmvnic_crq_queue *crq = &adapter->crq;
     struct device *dev = &adapter->vdev->dev;
     struct vio_dev *vdev = adapter->vdev;
     int rc, retrc = -ENOMEM;
 
     if (crq->msgs)
         return 0;
 
     crq->msgs = (union ibmvnic_crq *)get_zeroed_page(GFP_KERNEL);
     /* Should we allocate more than one page? */
 
     if (!crq->msgs)
         return -ENOMEM;
 
     crq->size = PAGE_SIZE / sizeof(*crq->msgs);
     crq->msg_token = dma_map_single(dev, crq->msgs, PAGE_SIZE,
                     DMA_BIDIRECTIONAL);
     if (dma_mapping_error(dev, crq->msg_token))
         goto map_failed;
 
     rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
                 crq->msg_token, PAGE_SIZE);
 
     if (rc == H_RESOURCE)
         /* maybe kexecing and resource is busy. try a reset */
         rc = ibmvnic_reset_crq(adapter);
     retrc = rc;
 
     if (rc == H_CLOSED) {
         dev_warn(dev, "Partner adapter not ready\n");
     } else if (rc) {
         dev_warn(dev, "Error %d opening adapter\n", rc);
         goto reg_crq_failed;
     }
 
     retrc = 0;
 
     tasklet_setup(&adapter->tasklet, (void *)ibmvnic_tasklet);
 
     netdev_dbg(adapter->netdev, "registering irq 0x%x\n", vdev->irq);
     snprintf(crq->name, sizeof(crq->name), "ibmvnic-%x",
          adapter->vdev->unit_address);
     rc = request_irq(vdev->irq, ibmvnic_interrupt, 0, crq->name, adapter);
     if (rc) {
         dev_err(dev, "Couldn't register irq 0x%x. rc=%d\n",
             vdev->irq, rc);
         goto req_irq_failed;
     }
 
     rc = vio_enable_interrupts(vdev);
     if (rc) {
         dev_err(dev, "Error %d enabling interrupts\n", rc);
         goto req_irq_failed;
     }
 
     crq->cur = 0;
     spin_lock_init(&crq->lock);
 
     /* process any CRQs that were queued before we enabled interrupts */
     tasklet_schedule(&adapter->tasklet);
 
     return retrc;
 
 req_irq_failed:
     tasklet_kill(&adapter->tasklet);
     do {
         rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
     } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
 reg_crq_failed:
     dma_unmap_single(dev, crq->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL);
 map_failed:
     free_page((unsigned long)crq->msgs);
     crq->msgs = NULL;
     return retrc;
 }
 
 static int ibmvnic_reset_init(struct ibmvnic_adapter *adapter, bool reset)
 {
     struct device *dev = &adapter->vdev->dev;
     unsigned long timeout = msecs_to_jiffies(20000);
     u64 old_num_rx_queues = adapter->req_rx_queues;
     u64 old_num_tx_queues = adapter->req_tx_queues;
     int rc;
 
     adapter->from_passive_init = false;
 
     rc = ibmvnic_send_crq_init(adapter);
     if (rc) {
         dev_err(dev, "Send crq init failed with error %d\n", rc);
         return rc;
     }
 
     if (!wait_for_completion_timeout(&adapter->init_done, timeout)) {
         dev_err(dev, "Initialization sequence timed out\n");
         return -ETIMEDOUT;
     }
 
     if (adapter->init_done_rc) {
         release_crq_queue(adapter);
         dev_err(dev, "CRQ-init failed, %d\n", adapter->init_done_rc);
         return adapter->init_done_rc;
     }
 
     if (adapter->from_passive_init) {
         adapter->state = VNIC_OPEN;
         adapter->from_passive_init = false;
         dev_err(dev, "CRQ-init failed, passive-init\n");
         return -EINVAL;
     }
 
     if (reset &&
         test_bit(0, &adapter->resetting) && !adapter->wait_for_reset &&
         adapter->reset_reason != VNIC_RESET_MOBILITY) {
         if (adapter->req_rx_queues != old_num_rx_queues ||
             adapter->req_tx_queues != old_num_tx_queues) {
             release_sub_crqs(adapter, 0);
             rc = init_sub_crqs(adapter);
         } else {
             /* no need to reinitialize completely, but we do
              * need to clean up transmits that were in flight
              * when we processed the reset.  Failure to do so
              * will confound the upper layer, usually TCP, by
              * creating the illusion of transmits that are
              * awaiting completion.
              */
             clean_tx_pools(adapter);
 
             rc = reset_sub_crq_queues(adapter);
         }
     } else {
         rc = init_sub_crqs(adapter);
     }
 
     if (rc) {
         dev_err(dev, "Initialization of sub crqs failed\n");
         release_crq_queue(adapter);
         return rc;
     }
 
     rc = init_sub_crq_irqs(adapter);
     if (rc) {
         dev_err(dev, "Failed to initialize sub crq irqs\n");
         release_crq_queue(adapter);
     }
 
     return rc;
 }
 
 static struct device_attribute dev_attr_failover;
 
 static int ibmvnic_probe(struct vio_dev *dev, const struct vio_device_id *id)
 {
     struct ibmvnic_adapter *adapter;
     struct net_device *netdev;
     unsigned char *mac_addr_p;
     unsigned long flags;
     bool init_success;
     int rc;
 
     dev_dbg(&dev->dev, "entering ibmvnic_probe for UA 0x%x\n",
         dev->unit_address);
 
     mac_addr_p = (unsigned char *)vio_get_attribute(dev,
                             VETH_MAC_ADDR, NULL);
     if (!mac_addr_p) {
         dev_err(&dev->dev,
             "(%s:%3.3d) ERROR: Can't find MAC_ADDR attribute\n",
             __FILE__, __LINE__);
         return 0;
     }
 
     netdev = alloc_etherdev_mq(sizeof(struct ibmvnic_adapter),
                    IBMVNIC_MAX_QUEUES);
     if (!netdev)
         return -ENOMEM;
 
     adapter = netdev_priv(netdev);
     adapter->state = VNIC_PROBING;
     dev_set_drvdata(&dev->dev, netdev);
     adapter->vdev = dev;
     adapter->netdev = netdev;
     adapter->login_pending = false;
     memset(&adapter->map_ids, 0, sizeof(adapter->map_ids));
     /* map_ids start at 1, so ensure map_id 0 is always "in-use" */
     bitmap_set(adapter->map_ids, 0, 1);
 
     ether_addr_copy(adapter->mac_addr, mac_addr_p);
     eth_hw_addr_set(netdev, adapter->mac_addr);
     netdev->irq = dev->irq;
     netdev->netdev_ops = &ibmvnic_netdev_ops;
     netdev->ethtool_ops = &ibmvnic_ethtool_ops;
     SET_NETDEV_DEV(netdev, &dev->dev);
 
     INIT_WORK(&adapter->ibmvnic_reset, __ibmvnic_reset);
     INIT_DELAYED_WORK(&adapter->ibmvnic_delayed_reset,
               __ibmvnic_delayed_reset);
     INIT_LIST_HEAD(&adapter->rwi_list);
     spin_lock_init(&adapter->rwi_lock);
     spin_lock_init(&adapter->state_lock);
     mutex_init(&adapter->fw_lock);
     init_completion(&adapter->probe_done);
     init_completion(&adapter->init_done);
     init_completion(&adapter->fw_done);
     init_completion(&adapter->reset_done);
     init_completion(&adapter->stats_done);
     clear_bit(0, &adapter->resetting);
     adapter->prev_rx_buf_sz = 0;
     adapter->prev_mtu = 0;
 
     init_success = false;
     do {
         reinit_init_done(adapter);
 
         /* clear any failovers we got in the previous pass
          * since we are reinitializing the CRQ
          */
         adapter->failover_pending = false;
 
         /* If we had already initialized CRQ, we may have one or
          * more resets queued already. Discard those and release
          * the CRQ before initializing the CRQ again.
          */
         release_crq_queue(adapter);
 
         /* Since we are still in PROBING state, __ibmvnic_reset()
          * will not access the ->rwi_list and since we released CRQ,
          * we won't get _new_ transport events. But there maybe an
          * ongoing ibmvnic_reset() call. So serialize access to
          * rwi_list. If we win the race, ibvmnic_reset() could add
          * a reset after we purged but thats ok - we just may end
          * up with an extra reset (i.e similar to having two or more
          * resets in the queue at once).
          * CHECK.
          */
         spin_lock_irqsave(&adapter->rwi_lock, flags);
         flush_reset_queue(adapter);
         spin_unlock_irqrestore(&adapter->rwi_lock, flags);
 
         rc = init_crq_queue(adapter);
         if (rc) {
             dev_err(&dev->dev, "Couldn't initialize crq. rc=%d\n",
                 rc);
             goto ibmvnic_init_fail;
         }
 
         rc = ibmvnic_reset_init(adapter, false);
     } while (rc == -EAGAIN);
 
     /* We are ignoring the error from ibmvnic_reset_init() assuming that the
      * partner is not ready. CRQ is not active. When the partner becomes
      * ready, we will do the passive init reset.
      */
 
     if (!rc)
         init_success = true;
 
     rc = init_stats_buffers(adapter);
     if (rc)
         goto ibmvnic_init_fail;
 
     rc = init_stats_token(adapter);
     if (rc)
         goto ibmvnic_stats_fail;
 
     rc = device_create_file(&dev->dev, &dev_attr_failover);
     if (rc)
         goto ibmvnic_dev_file_err;
 
     netif_carrier_off(netdev);
 
     if (init_success) {
         adapter->state = VNIC_PROBED;
         netdev->mtu = adapter->req_mtu - ETH_HLEN;
         netdev->min_mtu = adapter->min_mtu - ETH_HLEN;
         netdev->max_mtu = adapter->max_mtu - ETH_HLEN;
     } else {
         adapter->state = VNIC_DOWN;
     }
 
     adapter->wait_for_reset = false;
     adapter->last_reset_time = jiffies;
 
     rc = register_netdev(netdev);
     if (rc) {
         dev_err(&dev->dev, "failed to register netdev rc=%d\n", rc);
         goto ibmvnic_register_fail;
     }
     dev_info(&dev->dev, "ibmvnic registered\n");
 
     complete(&adapter->probe_done);
 
     return 0;
 
 ibmvnic_register_fail:
     device_remove_file(&dev->dev, &dev_attr_failover);
 
 ibmvnic_dev_file_err:
     release_stats_token(adapter);
 
 ibmvnic_stats_fail:
     release_stats_buffers(adapter);
 
 ibmvnic_init_fail:
     release_sub_crqs(adapter, 1);
     release_crq_queue(adapter);
 
     /* cleanup worker thread after releasing CRQ so we don't get
      * transport events (i.e new work items for the worker thread).
      */
     adapter->state = VNIC_REMOVING;
     complete(&adapter->probe_done);
     flush_work(&adapter->ibmvnic_reset);
     flush_delayed_work(&adapter->ibmvnic_delayed_reset);
 
     flush_reset_queue(adapter);
 
     mutex_destroy(&adapter->fw_lock);
     free_netdev(netdev);
 
     return rc;
 }
 
 static void ibmvnic_remove(struct vio_dev *dev)
 {
     struct net_device *netdev = dev_get_drvdata(&dev->dev);
     struct ibmvnic_adapter *adapter = netdev_priv(netdev);
     unsigned long flags;
 
     spin_lock_irqsave(&adapter->state_lock, flags);
 
     /* If ibmvnic_reset() is scheduling a reset, wait for it to
      * finish. Then, set the state to REMOVING to prevent it from
      * scheduling any more work and to have reset functions ignore
      * any resets that have already been scheduled. Drop the lock
      * after setting state, so __ibmvnic_reset() which is called
      * from the flush_work() below, can make progress.
      */
     spin_lock(&adapter->rwi_lock);
     adapter->state = VNIC_REMOVING;
     spin_unlock(&adapter->rwi_lock);
 
     spin_unlock_irqrestore(&adapter->state_lock, flags);
 
     flush_work(&adapter->ibmvnic_reset);
     flush_delayed_work(&adapter->ibmvnic_delayed_reset);
 
     rtnl_lock();
     unregister_netdevice(netdev);
 
     release_resources(adapter);
     release_rx_pools(adapter);
     release_tx_pools(adapter);
     release_sub_crqs(adapter, 1);
     release_crq_queue(adapter);
 
     release_stats_token(adapter);
     release_stats_buffers(adapter);
 
     adapter->state = VNIC_REMOVED;
 
     rtnl_unlock();
     mutex_destroy(&adapter->fw_lock);
     device_remove_file(&dev->dev, &dev_attr_failover);
     free_netdev(netdev);
     dev_set_drvdata(&dev->dev, NULL);
 }
 
 static ssize_t failover_store(struct device *dev, struct device_attribute *attr,
                   const char *buf, size_t count)
 {
     struct net_device *netdev = dev_get_drvdata(dev);
     struct ibmvnic_adapter *adapter = netdev_priv(netdev);
     unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
     __be64 session_token;
     long rc;
 
     if (!sysfs_streq(buf, "1"))
         return -EINVAL;
 
     rc = plpar_hcall(H_VIOCTL, retbuf, adapter->vdev->unit_address,
              H_GET_SESSION_TOKEN, 0, 0, 0);
     if (rc) {
         netdev_err(netdev, "Couldn't retrieve session token, rc %ld\n",
                rc);
         goto last_resort;
     }
 
     session_token = (__be64)retbuf[0];
     netdev_dbg(netdev, "Initiating client failover, session id %llx\n",
            be64_to_cpu(session_token));
     rc = plpar_hcall_norets(H_VIOCTL, adapter->vdev->unit_address,
                 H_SESSION_ERR_DETECTED, session_token, 0, 0);
     if (rc) {
         netdev_err(netdev,
                "H_VIOCTL initiated failover failed, rc %ld\n",
                rc);
         goto last_resort;
     }
 
     return count;
 
 last_resort:
     netdev_dbg(netdev, "Trying to send CRQ_CMD, the last resort\n");
     ibmvnic_reset(adapter, VNIC_RESET_FAILOVER);
 
     return count;
 }
 static DEVICE_ATTR_WO(failover);
 
 static unsigned long ibmvnic_get_desired_dma(struct vio_dev *vdev)
 {
     struct net_device *netdev = dev_get_drvdata(&vdev->dev);
     struct ibmvnic_adapter *adapter;
     struct iommu_table *tbl;
     unsigned long ret = 0;
     int i;
 
     tbl = get_iommu_table_base(&vdev->dev);
 
     /* netdev inits at probe time along with the structures we need below*/
     if (!netdev)
         return IOMMU_PAGE_ALIGN(IBMVNIC_IO_ENTITLEMENT_DEFAULT, tbl);
 
     adapter = netdev_priv(netdev);
 
     ret += PAGE_SIZE; /* the crq message queue */
     ret += IOMMU_PAGE_ALIGN(sizeof(struct ibmvnic_statistics), tbl);
 
     for (i = 0; i < adapter->req_tx_queues + adapter->req_rx_queues; i++)
         ret += 4 * PAGE_SIZE; /* the scrq message queue */
 
     for (i = 0; i < adapter->num_active_rx_pools; i++)
         ret += adapter->rx_pool[i].size *
             IOMMU_PAGE_ALIGN(adapter->rx_pool[i].buff_size, tbl);
 
     return ret;
 }
 
 static int ibmvnic_resume(struct device *dev)
 {
     struct net_device *netdev = dev_get_drvdata(dev);
     struct ibmvnic_adapter *adapter = netdev_priv(netdev);
 
     if (adapter->state != VNIC_OPEN)
         return 0;
 
     tasklet_schedule(&adapter->tasklet);
 
     return 0;
 }
 
 static const struct vio_device_id ibmvnic_device_table[] = {
     {"network", "IBM,vnic"},
     {"", "" }
 };
 MODULE_DEVICE_TABLE(vio, ibmvnic_device_table);
 
 static const struct dev_pm_ops ibmvnic_pm_ops = {
     .resume = ibmvnic_resume
 };
 
 static struct vio_driver ibmvnic_driver = {
     .id_table       = ibmvnic_device_table,
     .probe          = ibmvnic_probe,
     .remove         = ibmvnic_remove,
     .get_desired_dma = ibmvnic_get_desired_dma,
     .name       = ibmvnic_driver_name,
     .pm     = &ibmvnic_pm_ops,
 };
 
 /* module functions */
 static int __init ibmvnic_module_init(void)
 {
     pr_info("%s: %s %s\n", ibmvnic_driver_name, ibmvnic_driver_string,
         IBMVNIC_DRIVER_VERSION);
 
     return vio_register_driver(&ibmvnic_driver);
 }
 
 static void __exit ibmvnic_module_exit(void)
 {
     vio_unregister_driver(&ibmvnic_driver);
 }
 
 module_init(ibmvnic_module_init);
 module_exit(ibmvnic_module_exit);