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	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 // SPDX-License-Identifier: GPL-2.0
 /*
  * Keystone NetCP Core driver
  *
  * Copyright (C) 2014 Texas Instruments Incorporated
  * Authors: Sandeep Nair <sandeep_n@ti.com>
  *      Sandeep Paulraj <s-paulraj@ti.com>
  *      Cyril Chemparathy <cyril@ti.com>
  *      Santosh Shilimkar <santosh.shilimkar@ti.com>
  *      Murali Karicheri <m-karicheri2@ti.com>
  *      Wingman Kwok <w-kwok2@ti.com>
  */
 
 #include <linux/io.h>
 #include <linux/module.h>
 #include <linux/of_net.h>
 #include <linux/of_address.h>
 #include <linux/if_vlan.h>
 #include <linux/pm_runtime.h>
 #include <linux/platform_device.h>
 #include <linux/soc/ti/knav_qmss.h>
 #include <linux/soc/ti/knav_dma.h>
 
 #include "netcp.h"
 
 #define NETCP_SOP_OFFSET    (NET_IP_ALIGN + NET_SKB_PAD)
 #define NETCP_TX_TIMEOUT    (5 * HZ)
 #define NETCP_PACKET_SIZE   (ETH_FRAME_LEN + ETH_FCS_LEN)
 #define NETCP_MIN_PACKET_SIZE   ETH_ZLEN
 #define NETCP_MAX_MCAST_ADDR    16
 
 #define NETCP_EFUSE_REG_INDEX   0
 
 #define NETCP_MOD_PROBE_SKIPPED 1
 #define NETCP_MOD_PROBE_FAILED  2
 
 #define NETCP_DEBUG (NETIF_MSG_HW   | NETIF_MSG_WOL     |   \
             NETIF_MSG_DRV   | NETIF_MSG_LINK    |   \
             NETIF_MSG_IFUP  | NETIF_MSG_INTR    |   \
             NETIF_MSG_PROBE | NETIF_MSG_TIMER   |   \
             NETIF_MSG_IFDOWN    | NETIF_MSG_RX_ERR  |   \
             NETIF_MSG_TX_ERR    | NETIF_MSG_TX_DONE |   \
             NETIF_MSG_PKTDATA   | NETIF_MSG_TX_QUEUED   |   \
             NETIF_MSG_RX_STATUS)
 
 #define NETCP_EFUSE_ADDR_SWAP   2
 
 #define knav_queue_get_id(q)    knav_queue_device_control(q, \
                 KNAV_QUEUE_GET_ID, (unsigned long)NULL)
 
 #define knav_queue_enable_notify(q) knav_queue_device_control(q,    \
                     KNAV_QUEUE_ENABLE_NOTIFY,   \
                     (unsigned long)NULL)
 
 #define knav_queue_disable_notify(q) knav_queue_device_control(q,   \
                     KNAV_QUEUE_DISABLE_NOTIFY,  \
                     (unsigned long)NULL)
 
 #define knav_queue_get_count(q) knav_queue_device_control(q, \
                 KNAV_QUEUE_GET_COUNT, (unsigned long)NULL)
 
 #define for_each_netcp_module(module)           \
     list_for_each_entry(module, &netcp_modules, module_list)
 
 #define for_each_netcp_device_module(netcp_device, inst_modpriv) \
     list_for_each_entry(inst_modpriv, \
         &((netcp_device)->modpriv_head), inst_list)
 
 #define for_each_module(netcp, intf_modpriv)            \
     list_for_each_entry(intf_modpriv, &netcp->module_head, intf_list)
 
 /* Module management structures */
 struct netcp_device {
     struct list_head    device_list;
     struct list_head    interface_head;
     struct list_head    modpriv_head;
     struct device       *device;
 };
 
 struct netcp_inst_modpriv {
     struct netcp_device *netcp_device;
     struct netcp_module *netcp_module;
     struct list_head    inst_list;
     void            *module_priv;
 };
 
 struct netcp_intf_modpriv {
     struct netcp_intf   *netcp_priv;
     struct netcp_module *netcp_module;
     struct list_head    intf_list;
     void            *module_priv;
 };
 
 struct netcp_tx_cb {
     void    *ts_context;
     void    (*txtstamp)(void *context, struct sk_buff *skb);
 };
 
 static LIST_HEAD(netcp_devices);
 static LIST_HEAD(netcp_modules);
 static DEFINE_MUTEX(netcp_modules_lock);
 
 static int netcp_debug_level = -1;
 module_param(netcp_debug_level, int, 0);
 MODULE_PARM_DESC(netcp_debug_level, "Netcp debug level (NETIF_MSG bits) (0=none,...,16=all)");
 
 /* Helper functions - Get/Set */
 static void get_pkt_info(dma_addr_t *buff, u32 *buff_len, dma_addr_t *ndesc,
              struct knav_dma_desc *desc)
 {
     *buff_len = le32_to_cpu(desc->buff_len);
     *buff = le32_to_cpu(desc->buff);
     *ndesc = le32_to_cpu(desc->next_desc);
 }
 
 static void get_desc_info(u32 *desc_info, u32 *pkt_info,
               struct knav_dma_desc *desc)
 {
     *desc_info = le32_to_cpu(desc->desc_info);
     *pkt_info = le32_to_cpu(desc->packet_info);
 }
 
 static u32 get_sw_data(int index, struct knav_dma_desc *desc)
 {
     /* No Endian conversion needed as this data is untouched by hw */
     return desc->sw_data[index];
 }
 
 /* use these macros to get sw data */
 #define GET_SW_DATA0(desc) get_sw_data(0, desc)
 #define GET_SW_DATA1(desc) get_sw_data(1, desc)
 #define GET_SW_DATA2(desc) get_sw_data(2, desc)
 #define GET_SW_DATA3(desc) get_sw_data(3, desc)
 
 static void get_org_pkt_info(dma_addr_t *buff, u32 *buff_len,
                  struct knav_dma_desc *desc)
 {
     *buff = le32_to_cpu(desc->orig_buff);
     *buff_len = le32_to_cpu(desc->orig_len);
 }
 
 static void get_words(dma_addr_t *words, int num_words, __le32 *desc)
 {
     int i;
 
     for (i = 0; i < num_words; i++)
         words[i] = le32_to_cpu(desc[i]);
 }
 
 static void set_pkt_info(dma_addr_t buff, u32 buff_len, u32 ndesc,
              struct knav_dma_desc *desc)
 {
     desc->buff_len = cpu_to_le32(buff_len);
     desc->buff = cpu_to_le32(buff);
     desc->next_desc = cpu_to_le32(ndesc);
 }
 
 static void set_desc_info(u32 desc_info, u32 pkt_info,
               struct knav_dma_desc *desc)
 {
     desc->desc_info = cpu_to_le32(desc_info);
     desc->packet_info = cpu_to_le32(pkt_info);
 }
 
 static void set_sw_data(int index, u32 data, struct knav_dma_desc *desc)
 {
     /* No Endian conversion needed as this data is untouched by hw */
     desc->sw_data[index] = data;
 }
 
 /* use these macros to set sw data */
 #define SET_SW_DATA0(data, desc) set_sw_data(0, data, desc)
 #define SET_SW_DATA1(data, desc) set_sw_data(1, data, desc)
 #define SET_SW_DATA2(data, desc) set_sw_data(2, data, desc)
 #define SET_SW_DATA3(data, desc) set_sw_data(3, data, desc)
 
 static void set_org_pkt_info(dma_addr_t buff, u32 buff_len,
                  struct knav_dma_desc *desc)
 {
     desc->orig_buff = cpu_to_le32(buff);
     desc->orig_len = cpu_to_le32(buff_len);
 }
 
 static void set_words(u32 *words, int num_words, __le32 *desc)
 {
     int i;
 
     for (i = 0; i < num_words; i++)
         desc[i] = cpu_to_le32(words[i]);
 }
 
 /* Read the e-fuse value as 32 bit values to be endian independent */
 static int emac_arch_get_mac_addr(char *x, void __iomem *efuse_mac, u32 swap)
 {
     unsigned int addr0, addr1;
 
     addr1 = readl(efuse_mac + 4);
     addr0 = readl(efuse_mac);
 
     switch (swap) {
     case NETCP_EFUSE_ADDR_SWAP:
         addr0 = addr1;
         addr1 = readl(efuse_mac);
         break;
     default:
         break;
     }
 
     x[0] = (addr1 & 0x0000ff00) >> 8;
     x[1] = addr1 & 0x000000ff;
     x[2] = (addr0 & 0xff000000) >> 24;
     x[3] = (addr0 & 0x00ff0000) >> 16;
     x[4] = (addr0 & 0x0000ff00) >> 8;
     x[5] = addr0 & 0x000000ff;
 
     return 0;
 }
 
 /* Module management routines */
 static int netcp_register_interface(struct netcp_intf *netcp)
 {
     int ret;
 
     ret = register_netdev(netcp->ndev);
     if (!ret)
         netcp->netdev_registered = true;
     return ret;
 }
 
 static int netcp_module_probe(struct netcp_device *netcp_device,
                   struct netcp_module *module)
 {
     struct device *dev = netcp_device->device;
     struct device_node *devices, *interface, *node = dev->of_node;
     struct device_node *child;
     struct netcp_inst_modpriv *inst_modpriv;
     struct netcp_intf *netcp_intf;
     struct netcp_module *tmp;
     bool primary_module_registered = false;
     int ret;
 
     /* Find this module in the sub-tree for this device */
     devices = of_get_child_by_name(node, "netcp-devices");
     if (!devices) {
         dev_err(dev, "could not find netcp-devices node\n");
         return NETCP_MOD_PROBE_SKIPPED;
     }
 
     for_each_available_child_of_node(devices, child) {
         const char *name;
         char node_name[32];
 
         if (of_property_read_string(child, "label", &name) < 0) {
             snprintf(node_name, sizeof(node_name), "%pOFn", child);
             name = node_name;
         }
         if (!strcasecmp(module->name, name))
             break;
     }
 
     of_node_put(devices);
     /* If module not used for this device, skip it */
     if (!child) {
         dev_warn(dev, "module(%s) not used for device\n", module->name);
         return NETCP_MOD_PROBE_SKIPPED;
     }
 
     inst_modpriv = devm_kzalloc(dev, sizeof(*inst_modpriv), GFP_KERNEL);
     if (!inst_modpriv) {
         of_node_put(child);
         return -ENOMEM;
     }
 
     inst_modpriv->netcp_device = netcp_device;
     inst_modpriv->netcp_module = module;
     list_add_tail(&inst_modpriv->inst_list, &netcp_device->modpriv_head);
 
     ret = module->probe(netcp_device, dev, child,
                 &inst_modpriv->module_priv);
     of_node_put(child);
     if (ret) {
         dev_err(dev, "Probe of module(%s) failed with %d\n",
             module->name, ret);
         list_del(&inst_modpriv->inst_list);
         devm_kfree(dev, inst_modpriv);
         return NETCP_MOD_PROBE_FAILED;
     }
 
     /* Attach modules only if the primary module is probed */
     for_each_netcp_module(tmp) {
         if (tmp->primary)
             primary_module_registered = true;
     }
 
     if (!primary_module_registered)
         return 0;
 
     /* Attach module to interfaces */
     list_for_each_entry(netcp_intf, &netcp_device->interface_head,
                 interface_list) {
         struct netcp_intf_modpriv *intf_modpriv;
 
         intf_modpriv = devm_kzalloc(dev, sizeof(*intf_modpriv),
                         GFP_KERNEL);
         if (!intf_modpriv)
             return -ENOMEM;
 
         interface = of_parse_phandle(netcp_intf->node_interface,
                          module->name, 0);
 
         if (!interface) {
             devm_kfree(dev, intf_modpriv);
             continue;
         }
 
         intf_modpriv->netcp_priv = netcp_intf;
         intf_modpriv->netcp_module = module;
         list_add_tail(&intf_modpriv->intf_list,
                   &netcp_intf->module_head);
 
         ret = module->attach(inst_modpriv->module_priv,
                      netcp_intf->ndev, interface,
                      &intf_modpriv->module_priv);
         of_node_put(interface);
         if (ret) {
             dev_dbg(dev, "Attach of module %s declined with %d\n",
                 module->name, ret);
             list_del(&intf_modpriv->intf_list);
             devm_kfree(dev, intf_modpriv);
             continue;
         }
     }
 
     /* Now register the interface with netdev */
     list_for_each_entry(netcp_intf,
                 &netcp_device->interface_head,
                 interface_list) {
         /* If interface not registered then register now */
         if (!netcp_intf->netdev_registered) {
             ret = netcp_register_interface(netcp_intf);
             if (ret)
                 return -ENODEV;
         }
     }
     return 0;
 }
 
 int netcp_register_module(struct netcp_module *module)
 {
     struct netcp_device *netcp_device;
     struct netcp_module *tmp;
     int ret;
 
     if (!module->name) {
         WARN(1, "error registering netcp module: no name\n");
         return -EINVAL;
     }
 
     if (!module->probe) {
         WARN(1, "error registering netcp module: no probe\n");
         return -EINVAL;
     }
 
     mutex_lock(&netcp_modules_lock);
 
     for_each_netcp_module(tmp) {
         if (!strcasecmp(tmp->name, module->name)) {
             mutex_unlock(&netcp_modules_lock);
             return -EEXIST;
         }
     }
     list_add_tail(&module->module_list, &netcp_modules);
 
     list_for_each_entry(netcp_device, &netcp_devices, device_list) {
         ret = netcp_module_probe(netcp_device, module);
         if (ret < 0)
             goto fail;
     }
     mutex_unlock(&netcp_modules_lock);
     return 0;
 
 fail:
     mutex_unlock(&netcp_modules_lock);
     netcp_unregister_module(module);
     return ret;
 }
 EXPORT_SYMBOL_GPL(netcp_register_module);
 
 static void netcp_release_module(struct netcp_device *netcp_device,
                  struct netcp_module *module)
 {
     struct netcp_inst_modpriv *inst_modpriv, *inst_tmp;
     struct netcp_intf *netcp_intf, *netcp_tmp;
     struct device *dev = netcp_device->device;
 
     /* Release the module from each interface */
     list_for_each_entry_safe(netcp_intf, netcp_tmp,
                  &netcp_device->interface_head,
                  interface_list) {
         struct netcp_intf_modpriv *intf_modpriv, *intf_tmp;
 
         list_for_each_entry_safe(intf_modpriv, intf_tmp,
                      &netcp_intf->module_head,
                      intf_list) {
             if (intf_modpriv->netcp_module == module) {
                 module->release(intf_modpriv->module_priv);
                 list_del(&intf_modpriv->intf_list);
                 devm_kfree(dev, intf_modpriv);
                 break;
             }
         }
     }
 
     /* Remove the module from each instance */
     list_for_each_entry_safe(inst_modpriv, inst_tmp,
                  &netcp_device->modpriv_head, inst_list) {
         if (inst_modpriv->netcp_module == module) {
             module->remove(netcp_device,
                        inst_modpriv->module_priv);
             list_del(&inst_modpriv->inst_list);
             devm_kfree(dev, inst_modpriv);
             break;
         }
     }
 }
 
 void netcp_unregister_module(struct netcp_module *module)
 {
     struct netcp_device *netcp_device;
     struct netcp_module *module_tmp;
 
     mutex_lock(&netcp_modules_lock);
 
     list_for_each_entry(netcp_device, &netcp_devices, device_list) {
         netcp_release_module(netcp_device, module);
     }
 
     /* Remove the module from the module list */
     for_each_netcp_module(module_tmp) {
         if (module == module_tmp) {
             list_del(&module->module_list);
             break;
         }
     }
 
     mutex_unlock(&netcp_modules_lock);
 }
 EXPORT_SYMBOL_GPL(netcp_unregister_module);
 
 void *netcp_module_get_intf_data(struct netcp_module *module,
                  struct netcp_intf *intf)
 {
     struct netcp_intf_modpriv *intf_modpriv;
 
     list_for_each_entry(intf_modpriv, &intf->module_head, intf_list)
         if (intf_modpriv->netcp_module == module)
             return intf_modpriv->module_priv;
     return NULL;
 }
 EXPORT_SYMBOL_GPL(netcp_module_get_intf_data);
 
 /* Module TX and RX Hook management */
 struct netcp_hook_list {
     struct list_head     list;
     netcp_hook_rtn      *hook_rtn;
     void            *hook_data;
     int          order;
 };
 
 int netcp_register_txhook(struct netcp_intf *netcp_priv, int order,
               netcp_hook_rtn *hook_rtn, void *hook_data)
 {
     struct netcp_hook_list *entry;
     struct netcp_hook_list *next;
     unsigned long flags;
 
     entry = devm_kzalloc(netcp_priv->dev, sizeof(*entry), GFP_KERNEL);
     if (!entry)
         return -ENOMEM;
 
     entry->hook_rtn  = hook_rtn;
     entry->hook_data = hook_data;
     entry->order     = order;
 
     spin_lock_irqsave(&netcp_priv->lock, flags);
     list_for_each_entry(next, &netcp_priv->txhook_list_head, list) {
         if (next->order > order)
             break;
     }
     __list_add(&entry->list, next->list.prev, &next->list);
     spin_unlock_irqrestore(&netcp_priv->lock, flags);
 
     return 0;
 }
 EXPORT_SYMBOL_GPL(netcp_register_txhook);
 
 int netcp_unregister_txhook(struct netcp_intf *netcp_priv, int order,
                 netcp_hook_rtn *hook_rtn, void *hook_data)
 {
     struct netcp_hook_list *next, *n;
     unsigned long flags;
 
     spin_lock_irqsave(&netcp_priv->lock, flags);
     list_for_each_entry_safe(next, n, &netcp_priv->txhook_list_head, list) {
         if ((next->order     == order) &&
             (next->hook_rtn  == hook_rtn) &&
             (next->hook_data == hook_data)) {
             list_del(&next->list);
             spin_unlock_irqrestore(&netcp_priv->lock, flags);
             devm_kfree(netcp_priv->dev, next);
             return 0;
         }
     }
     spin_unlock_irqrestore(&netcp_priv->lock, flags);
     return -ENOENT;
 }
 EXPORT_SYMBOL_GPL(netcp_unregister_txhook);
 
 int netcp_register_rxhook(struct netcp_intf *netcp_priv, int order,
               netcp_hook_rtn *hook_rtn, void *hook_data)
 {
     struct netcp_hook_list *entry;
     struct netcp_hook_list *next;
     unsigned long flags;
 
     entry = devm_kzalloc(netcp_priv->dev, sizeof(*entry), GFP_KERNEL);
     if (!entry)
         return -ENOMEM;
 
     entry->hook_rtn  = hook_rtn;
     entry->hook_data = hook_data;
     entry->order     = order;
 
     spin_lock_irqsave(&netcp_priv->lock, flags);
     list_for_each_entry(next, &netcp_priv->rxhook_list_head, list) {
         if (next->order > order)
             break;
     }
     __list_add(&entry->list, next->list.prev, &next->list);
     spin_unlock_irqrestore(&netcp_priv->lock, flags);
 
     return 0;
 }
 EXPORT_SYMBOL_GPL(netcp_register_rxhook);
 
 int netcp_unregister_rxhook(struct netcp_intf *netcp_priv, int order,
                 netcp_hook_rtn *hook_rtn, void *hook_data)
 {
     struct netcp_hook_list *next, *n;
     unsigned long flags;
 
     spin_lock_irqsave(&netcp_priv->lock, flags);
     list_for_each_entry_safe(next, n, &netcp_priv->rxhook_list_head, list) {
         if ((next->order     == order) &&
             (next->hook_rtn  == hook_rtn) &&
             (next->hook_data == hook_data)) {
             list_del(&next->list);
             spin_unlock_irqrestore(&netcp_priv->lock, flags);
             devm_kfree(netcp_priv->dev, next);
             return 0;
         }
     }
     spin_unlock_irqrestore(&netcp_priv->lock, flags);
 
     return -ENOENT;
 }
 EXPORT_SYMBOL_GPL(netcp_unregister_rxhook);
 
 static void netcp_frag_free(bool is_frag, void *ptr)
 {
     if (is_frag)
         skb_free_frag(ptr);
     else
         kfree(ptr);
 }
 
 static void netcp_free_rx_desc_chain(struct netcp_intf *netcp,
                      struct knav_dma_desc *desc)
 {
     struct knav_dma_desc *ndesc;
     dma_addr_t dma_desc, dma_buf;
     unsigned int buf_len, dma_sz = sizeof(*ndesc);
     void *buf_ptr;
     u32 tmp;
 
     get_words(&dma_desc, 1, &desc->next_desc);
 
     while (dma_desc) {
         ndesc = knav_pool_desc_unmap(netcp->rx_pool, dma_desc, dma_sz);
         if (unlikely(!ndesc)) {
             dev_err(netcp->ndev_dev, "failed to unmap Rx desc\n");
             break;
         }
         get_pkt_info(&dma_buf, &tmp, &dma_desc, ndesc);
         /* warning!!!! We are retrieving the virtual ptr in the sw_data
          * field as a 32bit value. Will not work on 64bit machines
          */
         buf_ptr = (void *)GET_SW_DATA0(ndesc);
         buf_len = (int)GET_SW_DATA1(desc);
         dma_unmap_page(netcp->dev, dma_buf, PAGE_SIZE, DMA_FROM_DEVICE);
         __free_page(buf_ptr);
         knav_pool_desc_put(netcp->rx_pool, desc);
     }
     /* warning!!!! We are retrieving the virtual ptr in the sw_data
      * field as a 32bit value. Will not work on 64bit machines
      */
     buf_ptr = (void *)GET_SW_DATA0(desc);
     buf_len = (int)GET_SW_DATA1(desc);
 
     if (buf_ptr)
         netcp_frag_free(buf_len <= PAGE_SIZE, buf_ptr);
     knav_pool_desc_put(netcp->rx_pool, desc);
 }
 
 static void netcp_empty_rx_queue(struct netcp_intf *netcp)
 {
     struct netcp_stats *rx_stats = &netcp->stats;
     struct knav_dma_desc *desc;
     unsigned int dma_sz;
     dma_addr_t dma;
 
     for (; ;) {
         dma = knav_queue_pop(netcp->rx_queue, &dma_sz);
         if (!dma)
             break;
 
         desc = knav_pool_desc_unmap(netcp->rx_pool, dma, dma_sz);
         if (unlikely(!desc)) {
             dev_err(netcp->ndev_dev, "%s: failed to unmap Rx desc\n",
                 __func__);
             rx_stats->rx_errors++;
             continue;
         }
         netcp_free_rx_desc_chain(netcp, desc);
         rx_stats->rx_dropped++;
     }
 }
 
 static int netcp_process_one_rx_packet(struct netcp_intf *netcp)
 {
     struct netcp_stats *rx_stats = &netcp->stats;
     unsigned int dma_sz, buf_len, org_buf_len;
     struct knav_dma_desc *desc, *ndesc;
     unsigned int pkt_sz = 0, accum_sz;
     struct netcp_hook_list *rx_hook;
     dma_addr_t dma_desc, dma_buff;
     struct netcp_packet p_info;
     struct sk_buff *skb;
     void *org_buf_ptr;
     u32 tmp;
 
     dma_desc = knav_queue_pop(netcp->rx_queue, &dma_sz);
     if (!dma_desc)
         return -1;
 
     desc = knav_pool_desc_unmap(netcp->rx_pool, dma_desc, dma_sz);
     if (unlikely(!desc)) {
         dev_err(netcp->ndev_dev, "failed to unmap Rx desc\n");
         return 0;
     }
 
     get_pkt_info(&dma_buff, &buf_len, &dma_desc, desc);
     /* warning!!!! We are retrieving the virtual ptr in the sw_data
      * field as a 32bit value. Will not work on 64bit machines
      */
     org_buf_ptr = (void *)GET_SW_DATA0(desc);
     org_buf_len = (int)GET_SW_DATA1(desc);
 
     if (unlikely(!org_buf_ptr)) {
         dev_err(netcp->ndev_dev, "NULL bufptr in desc\n");
         goto free_desc;
     }
 
     pkt_sz &= KNAV_DMA_DESC_PKT_LEN_MASK;
     accum_sz = buf_len;
     dma_unmap_single(netcp->dev, dma_buff, buf_len, DMA_FROM_DEVICE);
 
     /* Build a new sk_buff for the primary buffer */
     skb = build_skb(org_buf_ptr, org_buf_len);
     if (unlikely(!skb)) {
         dev_err(netcp->ndev_dev, "build_skb() failed\n");
         goto free_desc;
     }
 
     /* update data, tail and len */
     skb_reserve(skb, NETCP_SOP_OFFSET);
     __skb_put(skb, buf_len);
 
     /* Fill in the page fragment list */
     while (dma_desc) {
         struct page *page;
 
         ndesc = knav_pool_desc_unmap(netcp->rx_pool, dma_desc, dma_sz);
         if (unlikely(!ndesc)) {
             dev_err(netcp->ndev_dev, "failed to unmap Rx desc\n");
             goto free_desc;
         }
 
         get_pkt_info(&dma_buff, &buf_len, &dma_desc, ndesc);
         /* warning!!!! We are retrieving the virtual ptr in the sw_data
          * field as a 32bit value. Will not work on 64bit machines
          */
         page = (struct page *)GET_SW_DATA0(ndesc);
 
         if (likely(dma_buff && buf_len && page)) {
             dma_unmap_page(netcp->dev, dma_buff, PAGE_SIZE,
                        DMA_FROM_DEVICE);
         } else {
             dev_err(netcp->ndev_dev, "Bad Rx desc dma_buff(%pad), len(%d), page(%p)\n",
                 &dma_buff, buf_len, page);
             goto free_desc;
         }
 
         skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page,
                 offset_in_page(dma_buff), buf_len, PAGE_SIZE);
         accum_sz += buf_len;
 
         /* Free the descriptor */
         knav_pool_desc_put(netcp->rx_pool, ndesc);
     }
 
     /* check for packet len and warn */
     if (unlikely(pkt_sz != accum_sz))
         dev_dbg(netcp->ndev_dev, "mismatch in packet size(%d) & sum of fragments(%d)\n",
             pkt_sz, accum_sz);
 
     /* Newer version of the Ethernet switch can trim the Ethernet FCS
      * from the packet and is indicated in hw_cap. So trim it only for
      * older h/w
      */
     if (!(netcp->hw_cap & ETH_SW_CAN_REMOVE_ETH_FCS))
         __pskb_trim(skb, skb->len - ETH_FCS_LEN);
 
     /* Call each of the RX hooks */
     p_info.skb = skb;
     skb->dev = netcp->ndev;
     p_info.rxtstamp_complete = false;
     get_desc_info(&tmp, &p_info.eflags, desc);
     p_info.epib = desc->epib;
     p_info.psdata = (u32 __force *)desc->psdata;
     p_info.eflags = ((p_info.eflags >> KNAV_DMA_DESC_EFLAGS_SHIFT) &
              KNAV_DMA_DESC_EFLAGS_MASK);
     list_for_each_entry(rx_hook, &netcp->rxhook_list_head, list) {
         int ret;
 
         ret = rx_hook->hook_rtn(rx_hook->order, rx_hook->hook_data,
                     &p_info);
         if (unlikely(ret)) {
             dev_err(netcp->ndev_dev, "RX hook %d failed: %d\n",
                 rx_hook->order, ret);
             /* Free the primary descriptor */
             rx_stats->rx_dropped++;
             knav_pool_desc_put(netcp->rx_pool, desc);
             dev_kfree_skb(skb);
             return 0;
         }
     }
     /* Free the primary descriptor */
     knav_pool_desc_put(netcp->rx_pool, desc);
 
     u64_stats_update_begin(&rx_stats->syncp_rx);
     rx_stats->rx_packets++;
     rx_stats->rx_bytes += skb->len;
     u64_stats_update_end(&rx_stats->syncp_rx);
 
     /* push skb up the stack */
     skb->protocol = eth_type_trans(skb, netcp->ndev);
     netif_receive_skb(skb);
     return 0;
 
 free_desc:
     netcp_free_rx_desc_chain(netcp, desc);
     rx_stats->rx_errors++;
     return 0;
 }
 
 static int netcp_process_rx_packets(struct netcp_intf *netcp,
                     unsigned int budget)
 {
     int i;
 
     for (i = 0; (i < budget) && !netcp_process_one_rx_packet(netcp); i++)
         ;
     return i;
 }
 
 /* Release descriptors and attached buffers from Rx FDQ */
 static void netcp_free_rx_buf(struct netcp_intf *netcp, int fdq)
 {
     struct knav_dma_desc *desc;
     unsigned int buf_len, dma_sz;
     dma_addr_t dma;
     void *buf_ptr;
 
     /* Allocate descriptor */
     while ((dma = knav_queue_pop(netcp->rx_fdq[fdq], &dma_sz))) {
         desc = knav_pool_desc_unmap(netcp->rx_pool, dma, dma_sz);
         if (unlikely(!desc)) {
             dev_err(netcp->ndev_dev, "failed to unmap Rx desc\n");
             continue;
         }
 
         get_org_pkt_info(&dma, &buf_len, desc);
         /* warning!!!! We are retrieving the virtual ptr in the sw_data
          * field as a 32bit value. Will not work on 64bit machines
          */
         buf_ptr = (void *)GET_SW_DATA0(desc);
 
         if (unlikely(!dma)) {
             dev_err(netcp->ndev_dev, "NULL orig_buff in desc\n");
             knav_pool_desc_put(netcp->rx_pool, desc);
             continue;
         }
 
         if (unlikely(!buf_ptr)) {
             dev_err(netcp->ndev_dev, "NULL bufptr in desc\n");
             knav_pool_desc_put(netcp->rx_pool, desc);
             continue;
         }
 
         if (fdq == 0) {
             dma_unmap_single(netcp->dev, dma, buf_len,
                      DMA_FROM_DEVICE);
             netcp_frag_free((buf_len <= PAGE_SIZE), buf_ptr);
         } else {
             dma_unmap_page(netcp->dev, dma, buf_len,
                        DMA_FROM_DEVICE);
             __free_page(buf_ptr);
         }
 
         knav_pool_desc_put(netcp->rx_pool, desc);
     }
 }
 
 static void netcp_rxpool_free(struct netcp_intf *netcp)
 {
     int i;
 
     for (i = 0; i < KNAV_DMA_FDQ_PER_CHAN &&
          !IS_ERR_OR_NULL(netcp->rx_fdq[i]); i++)
         netcp_free_rx_buf(netcp, i);
 
     if (knav_pool_count(netcp->rx_pool) != netcp->rx_pool_size)
         dev_err(netcp->ndev_dev, "Lost Rx (%d) descriptors\n",
             netcp->rx_pool_size - knav_pool_count(netcp->rx_pool));
 
     knav_pool_destroy(netcp->rx_pool);
     netcp->rx_pool = NULL;
 }
 
 static int netcp_allocate_rx_buf(struct netcp_intf *netcp, int fdq)
 {
     struct knav_dma_desc *hwdesc;
     unsigned int buf_len, dma_sz;
     u32 desc_info, pkt_info;
     struct page *page;
     dma_addr_t dma;
     void *bufptr;
     u32 sw_data[2];
 
     /* Allocate descriptor */
     hwdesc = knav_pool_desc_get(netcp->rx_pool);
     if (IS_ERR_OR_NULL(hwdesc)) {
         dev_dbg(netcp->ndev_dev, "out of rx pool desc\n");
         return -ENOMEM;
     }
 
     if (likely(fdq == 0)) {
         unsigned int primary_buf_len;
         /* Allocate a primary receive queue entry */
         buf_len = NETCP_PACKET_SIZE + NETCP_SOP_OFFSET;
         primary_buf_len = SKB_DATA_ALIGN(buf_len) +
                 SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
 
         bufptr = netdev_alloc_frag(primary_buf_len);
         sw_data[1] = primary_buf_len;
 
         if (unlikely(!bufptr)) {
             dev_warn_ratelimited(netcp->ndev_dev,
                          "Primary RX buffer alloc failed\n");
             goto fail;
         }
         dma = dma_map_single(netcp->dev, bufptr, buf_len,
                      DMA_TO_DEVICE);
         if (unlikely(dma_mapping_error(netcp->dev, dma)))
             goto fail;
 
         /* warning!!!! We are saving the virtual ptr in the sw_data
          * field as a 32bit value. Will not work on 64bit machines
          */
         sw_data[0] = (u32)bufptr;
     } else {
         /* Allocate a secondary receive queue entry */
         page = alloc_page(GFP_ATOMIC | GFP_DMA);
         if (unlikely(!page)) {
             dev_warn_ratelimited(netcp->ndev_dev, "Secondary page alloc failed\n");
             goto fail;
         }
         buf_len = PAGE_SIZE;
         dma = dma_map_page(netcp->dev, page, 0, buf_len, DMA_TO_DEVICE);
         /* warning!!!! We are saving the virtual ptr in the sw_data
          * field as a 32bit value. Will not work on 64bit machines
          */
         sw_data[0] = (u32)page;
         sw_data[1] = 0;
     }
 
     desc_info =  KNAV_DMA_DESC_PS_INFO_IN_DESC;
     desc_info |= buf_len & KNAV_DMA_DESC_PKT_LEN_MASK;
     pkt_info =  KNAV_DMA_DESC_HAS_EPIB;
     pkt_info |= KNAV_DMA_NUM_PS_WORDS << KNAV_DMA_DESC_PSLEN_SHIFT;
     pkt_info |= (netcp->rx_queue_id & KNAV_DMA_DESC_RETQ_MASK) <<
             KNAV_DMA_DESC_RETQ_SHIFT;
     set_org_pkt_info(dma, buf_len, hwdesc);
     SET_SW_DATA0(sw_data[0], hwdesc);
     SET_SW_DATA1(sw_data[1], hwdesc);
     set_desc_info(desc_info, pkt_info, hwdesc);
 
     /* Push to FDQs */
     knav_pool_desc_map(netcp->rx_pool, hwdesc, sizeof(*hwdesc), &dma,
                &dma_sz);
     knav_queue_push(netcp->rx_fdq[fdq], dma, sizeof(*hwdesc), 0);
     return 0;
 
 fail:
     knav_pool_desc_put(netcp->rx_pool, hwdesc);
     return -ENOMEM;
 }
 
 /* Refill Rx FDQ with descriptors & attached buffers */
 static void netcp_rxpool_refill(struct netcp_intf *netcp)
 {
     u32 fdq_deficit[KNAV_DMA_FDQ_PER_CHAN] = {0};
     int i, ret = 0;
 
     /* Calculate the FDQ deficit and refill */
     for (i = 0; i < KNAV_DMA_FDQ_PER_CHAN && netcp->rx_fdq[i]; i++) {
         fdq_deficit[i] = netcp->rx_queue_depths[i] -
                  knav_queue_get_count(netcp->rx_fdq[i]);
 
         while (fdq_deficit[i]-- && !ret)
             ret = netcp_allocate_rx_buf(netcp, i);
     } /* end for fdqs */
 }
 
 /* NAPI poll */
 static int netcp_rx_poll(struct napi_struct *napi, int budget)
 {
     struct netcp_intf *netcp = container_of(napi, struct netcp_intf,
                         rx_napi);
     unsigned int packets;
 
     packets = netcp_process_rx_packets(netcp, budget);
 
     netcp_rxpool_refill(netcp);
     if (packets < budget) {
         napi_complete_done(&netcp->rx_napi, packets);
         knav_queue_enable_notify(netcp->rx_queue);
     }
 
     return packets;
 }
 
 static void netcp_rx_notify(void *arg)
 {
     struct netcp_intf *netcp = arg;
 
     knav_queue_disable_notify(netcp->rx_queue);
     napi_schedule(&netcp->rx_napi);
 }
 
 static void netcp_free_tx_desc_chain(struct netcp_intf *netcp,
                      struct knav_dma_desc *desc,
                      unsigned int desc_sz)
 {
     struct knav_dma_desc *ndesc = desc;
     dma_addr_t dma_desc, dma_buf;
     unsigned int buf_len;
 
     while (ndesc) {
         get_pkt_info(&dma_buf, &buf_len, &dma_desc, ndesc);
 
         if (dma_buf && buf_len)
             dma_unmap_single(netcp->dev, dma_buf, buf_len,
                      DMA_TO_DEVICE);
         else
             dev_warn(netcp->ndev_dev, "bad Tx desc buf(%pad), len(%d)\n",
                  &dma_buf, buf_len);
 
         knav_pool_desc_put(netcp->tx_pool, ndesc);
         ndesc = NULL;
         if (dma_desc) {
             ndesc = knav_pool_desc_unmap(netcp->tx_pool, dma_desc,
                              desc_sz);
             if (!ndesc)
                 dev_err(netcp->ndev_dev, "failed to unmap Tx desc\n");
         }
     }
 }
 
 static int netcp_process_tx_compl_packets(struct netcp_intf *netcp,
                       unsigned int budget)
 {
     struct netcp_stats *tx_stats = &netcp->stats;
     struct knav_dma_desc *desc;
     struct netcp_tx_cb *tx_cb;
     struct sk_buff *skb;
     unsigned int dma_sz;
     dma_addr_t dma;
     int pkts = 0;
 
     while (budget--) {
         dma = knav_queue_pop(netcp->tx_compl_q, &dma_sz);
         if (!dma)
             break;
         desc = knav_pool_desc_unmap(netcp->tx_pool, dma, dma_sz);
         if (unlikely(!desc)) {
             dev_err(netcp->ndev_dev, "failed to unmap Tx desc\n");
             tx_stats->tx_errors++;
             continue;
         }
 
         /* warning!!!! We are retrieving the virtual ptr in the sw_data
          * field as a 32bit value. Will not work on 64bit machines
          */
         skb = (struct sk_buff *)GET_SW_DATA0(desc);
         netcp_free_tx_desc_chain(netcp, desc, dma_sz);
         if (!skb) {
             dev_err(netcp->ndev_dev, "No skb in Tx desc\n");
             tx_stats->tx_errors++;
             continue;
         }
 
         tx_cb = (struct netcp_tx_cb *)skb->cb;
         if (tx_cb->txtstamp)
             tx_cb->txtstamp(tx_cb->ts_context, skb);
 
         if (netif_subqueue_stopped(netcp->ndev, skb) &&
             netif_running(netcp->ndev) &&
             (knav_pool_count(netcp->tx_pool) >
             netcp->tx_resume_threshold)) {
             u16 subqueue = skb_get_queue_mapping(skb);
 
             netif_wake_subqueue(netcp->ndev, subqueue);
         }
 
         u64_stats_update_begin(&tx_stats->syncp_tx);
         tx_stats->tx_packets++;
         tx_stats->tx_bytes += skb->len;
         u64_stats_update_end(&tx_stats->syncp_tx);
         dev_kfree_skb(skb);
         pkts++;
     }
     return pkts;
 }
 
 static int netcp_tx_poll(struct napi_struct *napi, int budget)
 {
     int packets;
     struct netcp_intf *netcp = container_of(napi, struct netcp_intf,
                         tx_napi);
 
     packets = netcp_process_tx_compl_packets(netcp, budget);
     if (packets < budget) {
         napi_complete(&netcp->tx_napi);
         knav_queue_enable_notify(netcp->tx_compl_q);
     }
 
     return packets;
 }
 
 static void netcp_tx_notify(void *arg)
 {
     struct netcp_intf *netcp = arg;
 
     knav_queue_disable_notify(netcp->tx_compl_q);
     napi_schedule(&netcp->tx_napi);
 }
 
 static struct knav_dma_desc*
 netcp_tx_map_skb(struct sk_buff *skb, struct netcp_intf *netcp)
 {
     struct knav_dma_desc *desc, *ndesc, *pdesc;
     unsigned int pkt_len = skb_headlen(skb);
     struct device *dev = netcp->dev;
     dma_addr_t dma_addr;
     unsigned int dma_sz;
     int i;
 
     /* Map the linear buffer */
     dma_addr = dma_map_single(dev, skb->data, pkt_len, DMA_TO_DEVICE);
     if (unlikely(dma_mapping_error(dev, dma_addr))) {
         dev_err(netcp->ndev_dev, "Failed to map skb buffer\n");
         return NULL;
     }
 
     desc = knav_pool_desc_get(netcp->tx_pool);
     if (IS_ERR_OR_NULL(desc)) {
         dev_err(netcp->ndev_dev, "out of TX desc\n");
         dma_unmap_single(dev, dma_addr, pkt_len, DMA_TO_DEVICE);
         return NULL;
     }
 
     set_pkt_info(dma_addr, pkt_len, 0, desc);
     if (skb_is_nonlinear(skb)) {
         prefetchw(skb_shinfo(skb));
     } else {
         desc->next_desc = 0;
         goto upd_pkt_len;
     }
 
     pdesc = desc;
 
     /* Handle the case where skb is fragmented in pages */
     for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
         skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
         struct page *page = skb_frag_page(frag);
         u32 page_offset = skb_frag_off(frag);
         u32 buf_len = skb_frag_size(frag);
         dma_addr_t desc_dma;
         u32 desc_dma_32;
 
         dma_addr = dma_map_page(dev, page, page_offset, buf_len,
                     DMA_TO_DEVICE);
         if (unlikely(!dma_addr)) {
             dev_err(netcp->ndev_dev, "Failed to map skb page\n");
             goto free_descs;
         }
 
         ndesc = knav_pool_desc_get(netcp->tx_pool);
         if (IS_ERR_OR_NULL(ndesc)) {
             dev_err(netcp->ndev_dev, "out of TX desc for frags\n");
             dma_unmap_page(dev, dma_addr, buf_len, DMA_TO_DEVICE);
             goto free_descs;
         }
 
         desc_dma = knav_pool_desc_virt_to_dma(netcp->tx_pool, ndesc);
         set_pkt_info(dma_addr, buf_len, 0, ndesc);
         desc_dma_32 = (u32)desc_dma;
         set_words(&desc_dma_32, 1, &pdesc->next_desc);
         pkt_len += buf_len;
         if (pdesc != desc)
             knav_pool_desc_map(netcp->tx_pool, pdesc,
                        sizeof(*pdesc), &desc_dma, &dma_sz);
         pdesc = ndesc;
     }
     if (pdesc != desc)
         knav_pool_desc_map(netcp->tx_pool, pdesc, sizeof(*pdesc),
                    &dma_addr, &dma_sz);
 
     /* frag list based linkage is not supported for now. */
     if (skb_shinfo(skb)->frag_list) {
         dev_err_ratelimited(netcp->ndev_dev, "NETIF_F_FRAGLIST not supported\n");
         goto free_descs;
     }
 
 upd_pkt_len:
     WARN_ON(pkt_len != skb->len);
 
     pkt_len &= KNAV_DMA_DESC_PKT_LEN_MASK;
     set_words(&pkt_len, 1, &desc->desc_info);
     return desc;
 
 free_descs:
     netcp_free_tx_desc_chain(netcp, desc, sizeof(*desc));
     return NULL;
 }
 
 static int netcp_tx_submit_skb(struct netcp_intf *netcp,
                    struct sk_buff *skb,
                    struct knav_dma_desc *desc)
 {
     struct netcp_tx_pipe *tx_pipe = NULL;
     struct netcp_hook_list *tx_hook;
     struct netcp_packet p_info;
     struct netcp_tx_cb *tx_cb;
     unsigned int dma_sz;
     dma_addr_t dma;
     u32 tmp = 0;
     int ret = 0;
 
     p_info.netcp = netcp;
     p_info.skb = skb;
     p_info.tx_pipe = NULL;
     p_info.psdata_len = 0;
     p_info.ts_context = NULL;
     p_info.txtstamp = NULL;
     p_info.epib = desc->epib;
     p_info.psdata = (u32 __force *)desc->psdata;
     memset(p_info.epib, 0, KNAV_DMA_NUM_EPIB_WORDS * sizeof(__le32));
 
     /* Find out where to inject the packet for transmission */
     list_for_each_entry(tx_hook, &netcp->txhook_list_head, list) {
         ret = tx_hook->hook_rtn(tx_hook->order, tx_hook->hook_data,
                     &p_info);
         if (unlikely(ret != 0)) {
             dev_err(netcp->ndev_dev, "TX hook %d rejected the packet with reason(%d)\n",
                 tx_hook->order, ret);
             ret = (ret < 0) ? ret : NETDEV_TX_OK;
             goto out;
         }
     }
 
     /* Make sure some TX hook claimed the packet */
     tx_pipe = p_info.tx_pipe;
     if (!tx_pipe) {
         dev_err(netcp->ndev_dev, "No TX hook claimed the packet!\n");
         ret = -ENXIO;
         goto out;
     }
 
     tx_cb = (struct netcp_tx_cb *)skb->cb;
     tx_cb->ts_context = p_info.ts_context;
     tx_cb->txtstamp = p_info.txtstamp;
 
     /* update descriptor */
     if (p_info.psdata_len) {
         /* psdata points to both native-endian and device-endian data */
         __le32 *psdata = (void __force *)p_info.psdata;
 
         set_words((u32 *)psdata +
               (KNAV_DMA_NUM_PS_WORDS - p_info.psdata_len),
               p_info.psdata_len, psdata);
         tmp |= (p_info.psdata_len & KNAV_DMA_DESC_PSLEN_MASK) <<
             KNAV_DMA_DESC_PSLEN_SHIFT;
     }
 
     tmp |= KNAV_DMA_DESC_HAS_EPIB |
         ((netcp->tx_compl_qid & KNAV_DMA_DESC_RETQ_MASK) <<
         KNAV_DMA_DESC_RETQ_SHIFT);
 
     if (!(tx_pipe->flags & SWITCH_TO_PORT_IN_TAGINFO)) {
         tmp |= ((tx_pipe->switch_to_port & KNAV_DMA_DESC_PSFLAG_MASK) <<
             KNAV_DMA_DESC_PSFLAG_SHIFT);
     }
 
     set_words(&tmp, 1, &desc->packet_info);
     /* warning!!!! We are saving the virtual ptr in the sw_data
      * field as a 32bit value. Will not work on 64bit machines
      */
     SET_SW_DATA0((u32)skb, desc);
 
     if (tx_pipe->flags & SWITCH_TO_PORT_IN_TAGINFO) {
         tmp = tx_pipe->switch_to_port;
         set_words(&tmp, 1, &desc->tag_info);
     }
 
     /* submit packet descriptor */
     ret = knav_pool_desc_map(netcp->tx_pool, desc, sizeof(*desc), &dma,
                  &dma_sz);
     if (unlikely(ret)) {
         dev_err(netcp->ndev_dev, "%s() failed to map desc\n", __func__);
         ret = -ENOMEM;
         goto out;
     }
     skb_tx_timestamp(skb);
     knav_queue_push(tx_pipe->dma_queue, dma, dma_sz, 0);
 
 out:
     return ret;
 }
 
 /* Submit the packet */
 static int netcp_ndo_start_xmit(struct sk_buff *skb, struct net_device *ndev)
 {
     struct netcp_intf *netcp = netdev_priv(ndev);
     struct netcp_stats *tx_stats = &netcp->stats;
     int subqueue = skb_get_queue_mapping(skb);
     struct knav_dma_desc *desc;
     int desc_count, ret = 0;
 
     if (unlikely(skb->len <= 0)) {
         dev_kfree_skb(skb);
         return NETDEV_TX_OK;
     }
 
     if (unlikely(skb->len < NETCP_MIN_PACKET_SIZE)) {
         ret = skb_padto(skb, NETCP_MIN_PACKET_SIZE);
         if (ret < 0) {
             /* If we get here, the skb has already been dropped */
             dev_warn(netcp->ndev_dev, "padding failed (%d), packet dropped\n",
                  ret);
             tx_stats->tx_dropped++;
             return ret;
         }
         skb->len = NETCP_MIN_PACKET_SIZE;
     }
 
     desc = netcp_tx_map_skb(skb, netcp);
     if (unlikely(!desc)) {
         netif_stop_subqueue(ndev, subqueue);
         ret = -ENOBUFS;
         goto drop;
     }
 
     ret = netcp_tx_submit_skb(netcp, skb, desc);
     if (ret)
         goto drop;
 
     /* Check Tx pool count & stop subqueue if needed */
     desc_count = knav_pool_count(netcp->tx_pool);
     if (desc_count < netcp->tx_pause_threshold) {
         dev_dbg(netcp->ndev_dev, "pausing tx, count(%d)\n", desc_count);
         netif_stop_subqueue(ndev, subqueue);
     }
     return NETDEV_TX_OK;
 
 drop:
     tx_stats->tx_dropped++;
     if (desc)
         netcp_free_tx_desc_chain(netcp, desc, sizeof(*desc));
     dev_kfree_skb(skb);
     return ret;
 }
 
 int netcp_txpipe_close(struct netcp_tx_pipe *tx_pipe)
 {
     if (tx_pipe->dma_channel) {
         knav_dma_close_channel(tx_pipe->dma_channel);
         tx_pipe->dma_channel = NULL;
     }
     return 0;
 }
 EXPORT_SYMBOL_GPL(netcp_txpipe_close);
 
 int netcp_txpipe_open(struct netcp_tx_pipe *tx_pipe)
 {
     struct device *dev = tx_pipe->netcp_device->device;
     struct knav_dma_cfg config;
     int ret = 0;
     u8 name[16];
 
     memset(&config, 0, sizeof(config));
     config.direction = DMA_MEM_TO_DEV;
     config.u.tx.filt_einfo = false;
     config.u.tx.filt_pswords = false;
     config.u.tx.priority = DMA_PRIO_MED_L;
 
     tx_pipe->dma_channel = knav_dma_open_channel(dev,
                 tx_pipe->dma_chan_name, &config);
     if (IS_ERR(tx_pipe->dma_channel)) {
         dev_err(dev, "failed opening tx chan(%s)\n",
             tx_pipe->dma_chan_name);
         ret = PTR_ERR(tx_pipe->dma_channel);
         goto err;
     }
 
     snprintf(name, sizeof(name), "tx-pipe-%s", dev_name(dev));
     tx_pipe->dma_queue = knav_queue_open(name, tx_pipe->dma_queue_id,
                          KNAV_QUEUE_SHARED);
     if (IS_ERR(tx_pipe->dma_queue)) {
         dev_err(dev, "Could not open DMA queue for channel \"%s\": %pe\n",
             name, tx_pipe->dma_queue);
         ret = PTR_ERR(tx_pipe->dma_queue);
         goto err;
     }
 
     dev_dbg(dev, "opened tx pipe %s\n", name);
     return 0;
 
 err:
     if (!IS_ERR_OR_NULL(tx_pipe->dma_channel))
         knav_dma_close_channel(tx_pipe->dma_channel);
     tx_pipe->dma_channel = NULL;
     return ret;
 }
 EXPORT_SYMBOL_GPL(netcp_txpipe_open);
 
 int netcp_txpipe_init(struct netcp_tx_pipe *tx_pipe,
               struct netcp_device *netcp_device,
               const char *dma_chan_name, unsigned int dma_queue_id)
 {
     memset(tx_pipe, 0, sizeof(*tx_pipe));
     tx_pipe->netcp_device = netcp_device;
     tx_pipe->dma_chan_name = dma_chan_name;
     tx_pipe->dma_queue_id = dma_queue_id;
     return 0;
 }
 EXPORT_SYMBOL_GPL(netcp_txpipe_init);
 
 static struct netcp_addr *netcp_addr_find(struct netcp_intf *netcp,
                       const u8 *addr,
                       enum netcp_addr_type type)
 {
     struct netcp_addr *naddr;
 
     list_for_each_entry(naddr, &netcp->addr_list, node) {
         if (naddr->type != type)
             continue;
         if (addr && memcmp(addr, naddr->addr, ETH_ALEN))
             continue;
         return naddr;
     }
 
     return NULL;
 }
 
 static struct netcp_addr *netcp_addr_add(struct netcp_intf *netcp,
                      const u8 *addr,
                      enum netcp_addr_type type)
 {
     struct netcp_addr *naddr;
 
     naddr = devm_kmalloc(netcp->dev, sizeof(*naddr), GFP_ATOMIC);
     if (!naddr)
         return NULL;
 
     naddr->type = type;
     naddr->flags = 0;
     naddr->netcp = netcp;
     if (addr)
         ether_addr_copy(naddr->addr, addr);
     else
         eth_zero_addr(naddr->addr);
     list_add_tail(&naddr->node, &netcp->addr_list);
 
     return naddr;
 }
 
 static void netcp_addr_del(struct netcp_intf *netcp, struct netcp_addr *naddr)
 {
     list_del(&naddr->node);
     devm_kfree(netcp->dev, naddr);
 }
 
 static void netcp_addr_clear_mark(struct netcp_intf *netcp)
 {
     struct netcp_addr *naddr;
 
     list_for_each_entry(naddr, &netcp->addr_list, node)
         naddr->flags = 0;
 }
 
 static void netcp_addr_add_mark(struct netcp_intf *netcp, const u8 *addr,
                 enum netcp_addr_type type)
 {
     struct netcp_addr *naddr;
 
     naddr = netcp_addr_find(netcp, addr, type);
     if (naddr) {
         naddr->flags |= ADDR_VALID;
         return;
     }
 
     naddr = netcp_addr_add(netcp, addr, type);
     if (!WARN_ON(!naddr))
         naddr->flags |= ADDR_NEW;
 }
 
 static void netcp_addr_sweep_del(struct netcp_intf *netcp)
 {
     struct netcp_addr *naddr, *tmp;
     struct netcp_intf_modpriv *priv;
     struct netcp_module *module;
     int error;
 
     list_for_each_entry_safe(naddr, tmp, &netcp->addr_list, node) {
         if (naddr->flags & (ADDR_VALID | ADDR_NEW))
             continue;
         dev_dbg(netcp->ndev_dev, "deleting address %pM, type %x\n",
             naddr->addr, naddr->type);
         for_each_module(netcp, priv) {
             module = priv->netcp_module;
             if (!module->del_addr)
                 continue;
             error = module->del_addr(priv->module_priv,
                          naddr);
             WARN_ON(error);
         }
         netcp_addr_del(netcp, naddr);
     }
 }
 
 static void netcp_addr_sweep_add(struct netcp_intf *netcp)
 {
     struct netcp_addr *naddr, *tmp;
     struct netcp_intf_modpriv *priv;
     struct netcp_module *module;
     int error;
 
     list_for_each_entry_safe(naddr, tmp, &netcp->addr_list, node) {
         if (!(naddr->flags & ADDR_NEW))
             continue;
         dev_dbg(netcp->ndev_dev, "adding address %pM, type %x\n",
             naddr->addr, naddr->type);
 
         for_each_module(netcp, priv) {
             module = priv->netcp_module;
             if (!module->add_addr)
                 continue;
             error = module->add_addr(priv->module_priv, naddr);
             WARN_ON(error);
         }
     }
 }
 
 static int netcp_set_promiscuous(struct netcp_intf *netcp, bool promisc)
 {
     struct netcp_intf_modpriv *priv;
     struct netcp_module *module;
     int error;
 
     for_each_module(netcp, priv) {
         module = priv->netcp_module;
         if (!module->set_rx_mode)
             continue;
 
         error = module->set_rx_mode(priv->module_priv, promisc);
         if (error)
             return error;
     }
     return 0;
 }
 
 static void netcp_set_rx_mode(struct net_device *ndev)
 {
     struct netcp_intf *netcp = netdev_priv(ndev);
     struct netdev_hw_addr *ndev_addr;
     bool promisc;
 
     promisc = (ndev->flags & IFF_PROMISC ||
            ndev->flags & IFF_ALLMULTI ||
            netdev_mc_count(ndev) > NETCP_MAX_MCAST_ADDR);
 
     spin_lock(&netcp->lock);
     /* first clear all marks */
     netcp_addr_clear_mark(netcp);
 
     /* next add new entries, mark existing ones */
     netcp_addr_add_mark(netcp, ndev->broadcast, ADDR_BCAST);
     for_each_dev_addr(ndev, ndev_addr)
         netcp_addr_add_mark(netcp, ndev_addr->addr, ADDR_DEV);
     netdev_for_each_uc_addr(ndev_addr, ndev)
         netcp_addr_add_mark(netcp, ndev_addr->addr, ADDR_UCAST);
     netdev_for_each_mc_addr(ndev_addr, ndev)
         netcp_addr_add_mark(netcp, ndev_addr->addr, ADDR_MCAST);
 
     if (promisc)
         netcp_addr_add_mark(netcp, NULL, ADDR_ANY);
 
     /* finally sweep and callout into modules */
     netcp_addr_sweep_del(netcp);
     netcp_addr_sweep_add(netcp);
     netcp_set_promiscuous(netcp, promisc);
     spin_unlock(&netcp->lock);
 }
 
 static void netcp_free_navigator_resources(struct netcp_intf *netcp)
 {
     int i;
 
     if (netcp->rx_channel) {
         knav_dma_close_channel(netcp->rx_channel);
         netcp->rx_channel = NULL;
     }
 
     if (!IS_ERR_OR_NULL(netcp->rx_pool))
         netcp_rxpool_free(netcp);
 
     if (!IS_ERR_OR_NULL(netcp->rx_queue)) {
         knav_queue_close(netcp->rx_queue);
         netcp->rx_queue = NULL;
     }
 
     for (i = 0; i < KNAV_DMA_FDQ_PER_CHAN &&
          !IS_ERR_OR_NULL(netcp->rx_fdq[i]) ; ++i) {
         knav_queue_close(netcp->rx_fdq[i]);
         netcp->rx_fdq[i] = NULL;
     }
 
     if (!IS_ERR_OR_NULL(netcp->tx_compl_q)) {
         knav_queue_close(netcp->tx_compl_q);
         netcp->tx_compl_q = NULL;
     }
 
     if (!IS_ERR_OR_NULL(netcp->tx_pool)) {
         knav_pool_destroy(netcp->tx_pool);
         netcp->tx_pool = NULL;
     }
 }
 
 static int netcp_setup_navigator_resources(struct net_device *ndev)
 {
     struct netcp_intf *netcp = netdev_priv(ndev);
     struct knav_queue_notify_config notify_cfg;
     struct knav_dma_cfg config;
     u32 last_fdq = 0;
     u8 name[16];
     int ret;
     int i;
 
     /* Create Rx/Tx descriptor pools */
     snprintf(name, sizeof(name), "rx-pool-%s", ndev->name);
     netcp->rx_pool = knav_pool_create(name, netcp->rx_pool_size,
                         netcp->rx_pool_region_id);
     if (IS_ERR_OR_NULL(netcp->rx_pool)) {
         dev_err(netcp->ndev_dev, "Couldn't create rx pool\n");
         ret = PTR_ERR(netcp->rx_pool);
         goto fail;
     }
 
     snprintf(name, sizeof(name), "tx-pool-%s", ndev->name);
     netcp->tx_pool = knav_pool_create(name, netcp->tx_pool_size,
                         netcp->tx_pool_region_id);
     if (IS_ERR_OR_NULL(netcp->tx_pool)) {
         dev_err(netcp->ndev_dev, "Couldn't create tx pool\n");
         ret = PTR_ERR(netcp->tx_pool);
         goto fail;
     }
 
     /* open Tx completion queue */
     snprintf(name, sizeof(name), "tx-compl-%s", ndev->name);
     netcp->tx_compl_q = knav_queue_open(name, netcp->tx_compl_qid, 0);
     if (IS_ERR(netcp->tx_compl_q)) {
         ret = PTR_ERR(netcp->tx_compl_q);
         goto fail;
     }
     netcp->tx_compl_qid = knav_queue_get_id(netcp->tx_compl_q);
 
     /* Set notification for Tx completion */
     notify_cfg.fn = netcp_tx_notify;
     notify_cfg.fn_arg = netcp;
     ret = knav_queue_device_control(netcp->tx_compl_q,
                     KNAV_QUEUE_SET_NOTIFIER,
                     (unsigned long)&notify_cfg);
     if (ret)
         goto fail;
 
     knav_queue_disable_notify(netcp->tx_compl_q);
 
     /* open Rx completion queue */
     snprintf(name, sizeof(name), "rx-compl-%s", ndev->name);
     netcp->rx_queue = knav_queue_open(name, netcp->rx_queue_id, 0);
     if (IS_ERR(netcp->rx_queue)) {
         ret = PTR_ERR(netcp->rx_queue);
         goto fail;
     }
     netcp->rx_queue_id = knav_queue_get_id(netcp->rx_queue);
 
     /* Set notification for Rx completion */
     notify_cfg.fn = netcp_rx_notify;
     notify_cfg.fn_arg = netcp;
     ret = knav_queue_device_control(netcp->rx_queue,
                     KNAV_QUEUE_SET_NOTIFIER,
                     (unsigned long)&notify_cfg);
     if (ret)
         goto fail;
 
     knav_queue_disable_notify(netcp->rx_queue);
 
     /* open Rx FDQs */
     for (i = 0; i < KNAV_DMA_FDQ_PER_CHAN && netcp->rx_queue_depths[i];
          ++i) {
         snprintf(name, sizeof(name), "rx-fdq-%s-%d", ndev->name, i);
         netcp->rx_fdq[i] = knav_queue_open(name, KNAV_QUEUE_GP, 0);
         if (IS_ERR(netcp->rx_fdq[i])) {
             ret = PTR_ERR(netcp->rx_fdq[i]);
             goto fail;
         }
     }
 
     memset(&config, 0, sizeof(config));
     config.direction        = DMA_DEV_TO_MEM;
     config.u.rx.einfo_present   = true;
     config.u.rx.psinfo_present  = true;
     config.u.rx.err_mode        = DMA_DROP;
     config.u.rx.desc_type       = DMA_DESC_HOST;
     config.u.rx.psinfo_at_sop   = false;
     config.u.rx.sop_offset      = NETCP_SOP_OFFSET;
     config.u.rx.dst_q       = netcp->rx_queue_id;
     config.u.rx.thresh      = DMA_THRESH_NONE;
 
     for (i = 0; i < KNAV_DMA_FDQ_PER_CHAN; ++i) {
         if (netcp->rx_fdq[i])
             last_fdq = knav_queue_get_id(netcp->rx_fdq[i]);
         config.u.rx.fdq[i] = last_fdq;
     }
 
     netcp->rx_channel = knav_dma_open_channel(netcp->netcp_device->device,
                     netcp->dma_chan_name, &config);
     if (IS_ERR(netcp->rx_channel)) {
         dev_err(netcp->ndev_dev, "failed opening rx chan(%s\n",
             netcp->dma_chan_name);
         ret = PTR_ERR(netcp->rx_channel);
         goto fail;
     }
 
     dev_dbg(netcp->ndev_dev, "opened RX channel: %p\n", netcp->rx_channel);
     return 0;
 
 fail:
     netcp_free_navigator_resources(netcp);
     return ret;
 }
 
 /* Open the device */
 static int netcp_ndo_open(struct net_device *ndev)
 {
     struct netcp_intf *netcp = netdev_priv(ndev);
     struct netcp_intf_modpriv *intf_modpriv;
     struct netcp_module *module;
     int ret;
 
     netif_carrier_off(ndev);
     ret = netcp_setup_navigator_resources(ndev);
     if (ret) {
         dev_err(netcp->ndev_dev, "Failed to setup navigator resources\n");
         goto fail;
     }
 
     for_each_module(netcp, intf_modpriv) {
         module = intf_modpriv->netcp_module;
         if (module->open) {
             ret = module->open(intf_modpriv->module_priv, ndev);
             if (ret != 0) {
                 dev_err(netcp->ndev_dev, "module open failed\n");
                 goto fail_open;
             }
         }
     }
 
     napi_enable(&netcp->rx_napi);
     napi_enable(&netcp->tx_napi);
     knav_queue_enable_notify(netcp->tx_compl_q);
     knav_queue_enable_notify(netcp->rx_queue);
     netcp_rxpool_refill(netcp);
     netif_tx_wake_all_queues(ndev);
     dev_dbg(netcp->ndev_dev, "netcp device %s opened\n", ndev->name);
     return 0;
 
 fail_open:
     for_each_module(netcp, intf_modpriv) {
         module = intf_modpriv->netcp_module;
         if (module->close)
             module->close(intf_modpriv->module_priv, ndev);
     }
 
 fail:
     netcp_free_navigator_resources(netcp);
     return ret;
 }
 
 /* Close the device */
 static int netcp_ndo_stop(struct net_device *ndev)
 {
     struct netcp_intf *netcp = netdev_priv(ndev);
     struct netcp_intf_modpriv *intf_modpriv;
     struct netcp_module *module;
     int err = 0;
 
     netif_tx_stop_all_queues(ndev);
     netif_carrier_off(ndev);
     netcp_addr_clear_mark(netcp);
     netcp_addr_sweep_del(netcp);
     knav_queue_disable_notify(netcp->rx_queue);
     knav_queue_disable_notify(netcp->tx_compl_q);
     napi_disable(&netcp->rx_napi);
     napi_disable(&netcp->tx_napi);
 
     for_each_module(netcp, intf_modpriv) {
         module = intf_modpriv->netcp_module;
         if (module->close) {
             err = module->close(intf_modpriv->module_priv, ndev);
             if (err != 0)
                 dev_err(netcp->ndev_dev, "Close failed\n");
         }
     }
 
     /* Recycle Rx descriptors from completion queue */
     netcp_empty_rx_queue(netcp);
 
     /* Recycle Tx descriptors from completion queue */
     netcp_process_tx_compl_packets(netcp, netcp->tx_pool_size);
 
     if (knav_pool_count(netcp->tx_pool) != netcp->tx_pool_size)
         dev_err(netcp->ndev_dev, "Lost (%d) Tx descs\n",
             netcp->tx_pool_size - knav_pool_count(netcp->tx_pool));
 
     netcp_free_navigator_resources(netcp);
     dev_dbg(netcp->ndev_dev, "netcp device %s stopped\n", ndev->name);
     return 0;
 }
 
 static int netcp_ndo_ioctl(struct net_device *ndev,
                struct ifreq *req, int cmd)
 {
     struct netcp_intf *netcp = netdev_priv(ndev);
     struct netcp_intf_modpriv *intf_modpriv;
     struct netcp_module *module;
     int ret = -1, err = -EOPNOTSUPP;
 
     if (!netif_running(ndev))
         return -EINVAL;
 
     for_each_module(netcp, intf_modpriv) {
         module = intf_modpriv->netcp_module;
         if (!module->ioctl)
             continue;
 
         err = module->ioctl(intf_modpriv->module_priv, req, cmd);
         if ((err < 0) && (err != -EOPNOTSUPP)) {
             ret = err;
             goto out;
         }
         if (err == 0)
             ret = err;
     }
 
 out:
     return (ret == 0) ? 0 : err;
 }
 
 static void netcp_ndo_tx_timeout(struct net_device *ndev, unsigned int txqueue)
 {
     struct netcp_intf *netcp = netdev_priv(ndev);
     unsigned int descs = knav_pool_count(netcp->tx_pool);
 
     dev_err(netcp->ndev_dev, "transmit timed out tx descs(%d)\n", descs);
     netcp_process_tx_compl_packets(netcp, netcp->tx_pool_size);
     netif_trans_update(ndev);
     netif_tx_wake_all_queues(ndev);
 }
 
 static int netcp_rx_add_vid(struct net_device *ndev, __be16 proto, u16 vid)
 {
     struct netcp_intf *netcp = netdev_priv(ndev);
     struct netcp_intf_modpriv *intf_modpriv;
     struct netcp_module *module;
     unsigned long flags;
     int err = 0;
 
     dev_dbg(netcp->ndev_dev, "adding rx vlan id: %d\n", vid);
 
     spin_lock_irqsave(&netcp->lock, flags);
     for_each_module(netcp, intf_modpriv) {
         module = intf_modpriv->netcp_module;
         if ((module->add_vid) && (vid != 0)) {
             err = module->add_vid(intf_modpriv->module_priv, vid);
             if (err != 0) {
                 dev_err(netcp->ndev_dev, "Could not add vlan id = %d\n",
                     vid);
                 break;
             }
         }
     }
     spin_unlock_irqrestore(&netcp->lock, flags);
 
     return err;
 }
 
 static int netcp_rx_kill_vid(struct net_device *ndev, __be16 proto, u16 vid)
 {
     struct netcp_intf *netcp = netdev_priv(ndev);
     struct netcp_intf_modpriv *intf_modpriv;
     struct netcp_module *module;
     unsigned long flags;
     int err = 0;
 
     dev_dbg(netcp->ndev_dev, "removing rx vlan id: %d\n", vid);
 
     spin_lock_irqsave(&netcp->lock, flags);
     for_each_module(netcp, intf_modpriv) {
         module = intf_modpriv->netcp_module;
         if (module->del_vid) {
             err = module->del_vid(intf_modpriv->module_priv, vid);
             if (err != 0) {
                 dev_err(netcp->ndev_dev, "Could not delete vlan id = %d\n",
                     vid);
                 break;
             }
         }
     }
     spin_unlock_irqrestore(&netcp->lock, flags);
     return err;
 }
 
 static int netcp_setup_tc(struct net_device *dev, enum tc_setup_type type,
               void *type_data)
 {
     struct tc_mqprio_qopt *mqprio = type_data;
     u8 num_tc;
     int i;
 
     /* setup tc must be called under rtnl lock */
     ASSERT_RTNL();
 
     if (type != TC_SETUP_QDISC_MQPRIO)
         return -EOPNOTSUPP;
 
     mqprio->hw = TC_MQPRIO_HW_OFFLOAD_TCS;
     num_tc = mqprio->num_tc;
 
     /* Sanity-check the number of traffic classes requested */
     if ((dev->real_num_tx_queues <= 1) ||
         (dev->real_num_tx_queues < num_tc))
         return -EINVAL;
 
     /* Configure traffic class to queue mappings */
     if (num_tc) {
         netdev_set_num_tc(dev, num_tc);
         for (i = 0; i < num_tc; i++)
             netdev_set_tc_queue(dev, i, 1, i);
     } else {
         netdev_reset_tc(dev);
     }
 
     return 0;
 }
 
 static void
 netcp_get_stats(struct net_device *ndev, struct rtnl_link_stats64 *stats)
 {
     struct netcp_intf *netcp = netdev_priv(ndev);
     struct netcp_stats *p = &netcp->stats;
     u64 rxpackets, rxbytes, txpackets, txbytes;
     unsigned int start;
 
     do {
         start = u64_stats_fetch_begin_irq(&p->syncp_rx);
         rxpackets       = p->rx_packets;
         rxbytes         = p->rx_bytes;
     } while (u64_stats_fetch_retry_irq(&p->syncp_rx, start));
 
     do {
         start = u64_stats_fetch_begin_irq(&p->syncp_tx);
         txpackets       = p->tx_packets;
         txbytes         = p->tx_bytes;
     } while (u64_stats_fetch_retry_irq(&p->syncp_tx, start));
 
     stats->rx_packets = rxpackets;
     stats->rx_bytes = rxbytes;
     stats->tx_packets = txpackets;
     stats->tx_bytes = txbytes;
 
     /* The following are stored as 32 bit */
     stats->rx_errors = p->rx_errors;
     stats->rx_dropped = p->rx_dropped;
     stats->tx_dropped = p->tx_dropped;
 }
 
 static const struct net_device_ops netcp_netdev_ops = {
     .ndo_open       = netcp_ndo_open,
     .ndo_stop       = netcp_ndo_stop,
     .ndo_start_xmit     = netcp_ndo_start_xmit,
     .ndo_set_rx_mode    = netcp_set_rx_mode,
     .ndo_eth_ioctl           = netcp_ndo_ioctl,
     .ndo_get_stats64        = netcp_get_stats,
     .ndo_set_mac_address    = eth_mac_addr,
     .ndo_validate_addr  = eth_validate_addr,
     .ndo_vlan_rx_add_vid    = netcp_rx_add_vid,
     .ndo_vlan_rx_kill_vid   = netcp_rx_kill_vid,
     .ndo_tx_timeout     = netcp_ndo_tx_timeout,
     .ndo_select_queue   = dev_pick_tx_zero,
     .ndo_setup_tc       = netcp_setup_tc,
 };
 
 static int netcp_create_interface(struct netcp_device *netcp_device,
                   struct device_node *node_interface)
 {
     struct device *dev = netcp_device->device;
     struct device_node *node = dev->of_node;
     struct netcp_intf *netcp;
     struct net_device *ndev;
     resource_size_t size;
     struct resource res;
     void __iomem *efuse = NULL;
     u32 efuse_mac = 0;
     u8 efuse_mac_addr[6];
     u32 temp[2];
     int ret = 0;
 
     ndev = alloc_etherdev_mqs(sizeof(*netcp), 1, 1);
     if (!ndev) {
         dev_err(dev, "Error allocating netdev\n");
         return -ENOMEM;
     }
 
     ndev->features |= NETIF_F_SG;
     ndev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
     ndev->hw_features = ndev->features;
     ndev->vlan_features |=  NETIF_F_SG;
 
     /* MTU range: 68 - 9486 */
     ndev->min_mtu = ETH_MIN_MTU;
     ndev->max_mtu = NETCP_MAX_FRAME_SIZE - (ETH_HLEN + ETH_FCS_LEN);
 
     netcp = netdev_priv(ndev);
     spin_lock_init(&netcp->lock);
     INIT_LIST_HEAD(&netcp->module_head);
     INIT_LIST_HEAD(&netcp->txhook_list_head);
     INIT_LIST_HEAD(&netcp->rxhook_list_head);
     INIT_LIST_HEAD(&netcp->addr_list);
     u64_stats_init(&netcp->stats.syncp_rx);
     u64_stats_init(&netcp->stats.syncp_tx);
     netcp->netcp_device = netcp_device;
     netcp->dev = netcp_device->device;
     netcp->ndev = ndev;
     netcp->ndev_dev  = &ndev->dev;
     netcp->msg_enable = netif_msg_init(netcp_debug_level, NETCP_DEBUG);
     netcp->tx_pause_threshold = MAX_SKB_FRAGS;
     netcp->tx_resume_threshold = netcp->tx_pause_threshold;
     netcp->node_interface = node_interface;
 
     ret = of_property_read_u32(node_interface, "efuse-mac", &efuse_mac);
     if (efuse_mac) {
         if (of_address_to_resource(node, NETCP_EFUSE_REG_INDEX, &res)) {
             dev_err(dev, "could not find efuse-mac reg resource\n");
             ret = -ENODEV;
             goto quit;
         }
         size = resource_size(&res);
 
         if (!devm_request_mem_region(dev, res.start, size,
                          dev_name(dev))) {
             dev_err(dev, "could not reserve resource\n");
             ret = -ENOMEM;
             goto quit;
         }
 
         efuse = devm_ioremap(dev, res.start, size);
         if (!efuse) {
             dev_err(dev, "could not map resource\n");
             devm_release_mem_region(dev, res.start, size);
             ret = -ENOMEM;
             goto quit;
         }
 
         emac_arch_get_mac_addr(efuse_mac_addr, efuse, efuse_mac);
         if (is_valid_ether_addr(efuse_mac_addr))
             eth_hw_addr_set(ndev, efuse_mac_addr);
         else
             eth_hw_addr_random(ndev);
 
         devm_iounmap(dev, efuse);
         devm_release_mem_region(dev, res.start, size);
     } else {
         ret = of_get_ethdev_address(node_interface, ndev);
         if (ret)
             eth_hw_addr_random(ndev);
     }
 
     ret = of_property_read_string(node_interface, "rx-channel",
                       &netcp->dma_chan_name);
     if (ret < 0) {
         dev_err(dev, "missing \"rx-channel\" parameter\n");
         ret = -ENODEV;
         goto quit;
     }
 
     ret = of_property_read_u32(node_interface, "rx-queue",
                    &netcp->rx_queue_id);
     if (ret < 0) {
         dev_warn(dev, "missing \"rx-queue\" parameter\n");
         netcp->rx_queue_id = KNAV_QUEUE_QPEND;
     }
 
     ret = of_property_read_u32_array(node_interface, "rx-queue-depth",
                      netcp->rx_queue_depths,
                      KNAV_DMA_FDQ_PER_CHAN);
     if (ret < 0) {
         dev_err(dev, "missing \"rx-queue-depth\" parameter\n");
         netcp->rx_queue_depths[0] = 128;
     }
 
     ret = of_property_read_u32_array(node_interface, "rx-pool", temp, 2);
     if (ret < 0) {
         dev_err(dev, "missing \"rx-pool\" parameter\n");
         ret = -ENODEV;
         goto quit;
     }
     netcp->rx_pool_size = temp[0];
     netcp->rx_pool_region_id = temp[1];
 
     ret = of_property_read_u32_array(node_interface, "tx-pool", temp, 2);
     if (ret < 0) {
         dev_err(dev, "missing \"tx-pool\" parameter\n");
         ret = -ENODEV;
         goto quit;
     }
     netcp->tx_pool_size = temp[0];
     netcp->tx_pool_region_id = temp[1];
 
     if (netcp->tx_pool_size < MAX_SKB_FRAGS) {
         dev_err(dev, "tx-pool size too small, must be at least %ld\n",
             MAX_SKB_FRAGS);
         ret = -ENODEV;
         goto quit;
     }
 
     ret = of_property_read_u32(node_interface, "tx-completion-queue",
                    &netcp->tx_compl_qid);
     if (ret < 0) {
         dev_warn(dev, "missing \"tx-completion-queue\" parameter\n");
         netcp->tx_compl_qid = KNAV_QUEUE_QPEND;
     }
 
     /* NAPI register */
     netif_napi_add(ndev, &netcp->rx_napi, netcp_rx_poll, NAPI_POLL_WEIGHT);
     netif_napi_add_tx(ndev, &netcp->tx_napi, netcp_tx_poll);
 
     /* Register the network device */
     ndev->dev_id        = 0;
     ndev->watchdog_timeo    = NETCP_TX_TIMEOUT;
     ndev->netdev_ops    = &netcp_netdev_ops;
     SET_NETDEV_DEV(ndev, dev);
 
     list_add_tail(&netcp->interface_list, &netcp_device->interface_head);
     return 0;
 
 quit:
     free_netdev(ndev);
     return ret;
 }
 
 static void netcp_delete_interface(struct netcp_device *netcp_device,
                    struct net_device *ndev)
 {
     struct netcp_intf_modpriv *intf_modpriv, *tmp;
     struct netcp_intf *netcp = netdev_priv(ndev);
     struct netcp_module *module;
 
     dev_dbg(netcp_device->device, "Removing interface \"%s\"\n",
         ndev->name);
 
     /* Notify each of the modules that the interface is going away */
     list_for_each_entry_safe(intf_modpriv, tmp, &netcp->module_head,
                  intf_list) {
         module = intf_modpriv->netcp_module;
         dev_dbg(netcp_device->device, "Releasing module \"%s\"\n",
             module->name);
         if (module->release)
             module->release(intf_modpriv->module_priv);
         list_del(&intf_modpriv->intf_list);
     }
     WARN(!list_empty(&netcp->module_head), "%s interface module list is not empty!\n",
          ndev->name);
 
     list_del(&netcp->interface_list);
 
     of_node_put(netcp->node_interface);
     unregister_netdev(ndev);
     free_netdev(ndev);
 }
 
 static int netcp_probe(struct platform_device *pdev)
 {
     struct device_node *node = pdev->dev.of_node;
     struct netcp_intf *netcp_intf, *netcp_tmp;
     struct device_node *child, *interfaces;
     struct netcp_device *netcp_device;
     struct device *dev = &pdev->dev;
     struct netcp_module *module;
     int ret;
 
     if (!knav_dma_device_ready() ||
         !knav_qmss_device_ready())
         return -EPROBE_DEFER;
 
     if (!node) {
         dev_err(dev, "could not find device info\n");
         return -ENODEV;
     }
 
     /* Allocate a new NETCP device instance */
     netcp_device = devm_kzalloc(dev, sizeof(*netcp_device), GFP_KERNEL);
     if (!netcp_device)
         return -ENOMEM;
 
     pm_runtime_enable(&pdev->dev);
     ret = pm_runtime_get_sync(&pdev->dev);
     if (ret < 0) {
         dev_err(dev, "Failed to enable NETCP power-domain\n");
         pm_runtime_disable(&pdev->dev);
         return ret;
     }
 
     /* Initialize the NETCP device instance */
     INIT_LIST_HEAD(&netcp_device->interface_head);
     INIT_LIST_HEAD(&netcp_device->modpriv_head);
     netcp_device->device = dev;
     platform_set_drvdata(pdev, netcp_device);
 
     /* create interfaces */
     interfaces = of_get_child_by_name(node, "netcp-interfaces");
     if (!interfaces) {
         dev_err(dev, "could not find netcp-interfaces node\n");
         ret = -ENODEV;
         goto probe_quit;
     }
 
     for_each_available_child_of_node(interfaces, child) {
         ret = netcp_create_interface(netcp_device, child);
         if (ret) {
             dev_err(dev, "could not create interface(%pOFn)\n",
                 child);
             goto probe_quit_interface;
         }
     }
 
     of_node_put(interfaces);
 
     /* Add the device instance to the list */
     list_add_tail(&netcp_device->device_list, &netcp_devices);
 
     /* Probe & attach any modules already registered */
     mutex_lock(&netcp_modules_lock);
     for_each_netcp_module(module) {
         ret = netcp_module_probe(netcp_device, module);
         if (ret < 0)
             dev_err(dev, "module(%s) probe failed\n", module->name);
     }
     mutex_unlock(&netcp_modules_lock);
     return 0;
 
 probe_quit_interface:
     list_for_each_entry_safe(netcp_intf, netcp_tmp,
                  &netcp_device->interface_head,
                  interface_list) {
         netcp_delete_interface(netcp_device, netcp_intf->ndev);
     }
 
     of_node_put(interfaces);
 
 probe_quit:
     pm_runtime_put_sync(&pdev->dev);
     pm_runtime_disable(&pdev->dev);
     platform_set_drvdata(pdev, NULL);
     return ret;
 }
 
 static int netcp_remove(struct platform_device *pdev)
 {
     struct netcp_device *netcp_device = platform_get_drvdata(pdev);
     struct netcp_intf *netcp_intf, *netcp_tmp;
     struct netcp_inst_modpriv *inst_modpriv, *tmp;
     struct netcp_module *module;
 
     list_for_each_entry_safe(inst_modpriv, tmp, &netcp_device->modpriv_head,
                  inst_list) {
         module = inst_modpriv->netcp_module;
         dev_dbg(&pdev->dev, "Removing module \"%s\"\n", module->name);
         module->remove(netcp_device, inst_modpriv->module_priv);
         list_del(&inst_modpriv->inst_list);
     }
 
     /* now that all modules are removed, clean up the interfaces */
     list_for_each_entry_safe(netcp_intf, netcp_tmp,
                  &netcp_device->interface_head,
                  interface_list) {
         netcp_delete_interface(netcp_device, netcp_intf->ndev);
     }
 
     WARN(!list_empty(&netcp_device->interface_head),
          "%s interface list not empty!\n", pdev->name);
 
     pm_runtime_put_sync(&pdev->dev);
     pm_runtime_disable(&pdev->dev);
     platform_set_drvdata(pdev, NULL);
     return 0;
 }
 
 static const struct of_device_id of_match[] = {
     { .compatible = "ti,netcp-1.0", },
     {},
 };
 MODULE_DEVICE_TABLE(of, of_match);
 
 static struct platform_driver netcp_driver = {
     .driver = {
         .name       = "netcp-1.0",
         .of_match_table = of_match,
     },
     .probe = netcp_probe,
     .remove = netcp_remove,
 };
 module_platform_driver(netcp_driver);
 
 MODULE_LICENSE("GPL v2");
 MODULE_DESCRIPTION("TI NETCP driver for Keystone SOCs");
 MODULE_AUTHOR("Sandeep Nair <sandeep_n@ti.com");

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