OSCL-LXR linux-6.0.1/​drivers/​scsi/​fcoe/​fcoe_ctlr.c	Source navigation Diff markup Identifier search General search
	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-only
 /*
  * Copyright (c) 2008-2009 Cisco Systems, Inc.  All rights reserved.
  * Copyright (c) 2009 Intel Corporation.  All rights reserved.
  *
  * Maintained at www.Open-FCoE.org
  */
 
 #include <linux/types.h>
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/list.h>
 #include <linux/spinlock.h>
 #include <linux/timer.h>
 #include <linux/netdevice.h>
 #include <linux/etherdevice.h>
 #include <linux/ethtool.h>
 #include <linux/if_ether.h>
 #include <linux/if_vlan.h>
 #include <linux/errno.h>
 #include <linux/bitops.h>
 #include <linux/slab.h>
 #include <net/rtnetlink.h>
 
 #include <scsi/fc/fc_els.h>
 #include <scsi/fc/fc_fs.h>
 #include <scsi/fc/fc_fip.h>
 #include <scsi/fc/fc_encaps.h>
 #include <scsi/fc/fc_fcoe.h>
 #include <scsi/fc/fc_fcp.h>
 
 #include <scsi/libfc.h>
 #include <scsi/libfcoe.h>
 
 #include "libfcoe.h"
 
 #define FCOE_CTLR_MIN_FKA   500     /* min keep alive (mS) */
 #define FCOE_CTLR_DEF_FKA   FIP_DEF_FKA /* default keep alive (mS) */
 
 static void fcoe_ctlr_timeout(struct timer_list *);
 static void fcoe_ctlr_timer_work(struct work_struct *);
 static void fcoe_ctlr_recv_work(struct work_struct *);
 static int fcoe_ctlr_flogi_retry(struct fcoe_ctlr *);
 
 static void fcoe_ctlr_vn_start(struct fcoe_ctlr *);
 static int fcoe_ctlr_vn_recv(struct fcoe_ctlr *, struct sk_buff *);
 static void fcoe_ctlr_vn_timeout(struct fcoe_ctlr *);
 static int fcoe_ctlr_vn_lookup(struct fcoe_ctlr *, u32, u8 *);
 
 static int fcoe_ctlr_vlan_recv(struct fcoe_ctlr *, struct sk_buff *);
 
 static u8 fcoe_all_fcfs[ETH_ALEN] = FIP_ALL_FCF_MACS;
 static u8 fcoe_all_enode[ETH_ALEN] = FIP_ALL_ENODE_MACS;
 static u8 fcoe_all_vn2vn[ETH_ALEN] = FIP_ALL_VN2VN_MACS;
 static u8 fcoe_all_p2p[ETH_ALEN] = FIP_ALL_P2P_MACS;
 
 static const char * const fcoe_ctlr_states[] = {
     [FIP_ST_DISABLED] = "DISABLED",
     [FIP_ST_LINK_WAIT] =    "LINK_WAIT",
     [FIP_ST_AUTO] =     "AUTO",
     [FIP_ST_NON_FIP] =  "NON_FIP",
     [FIP_ST_ENABLED] =  "ENABLED",
     [FIP_ST_VNMP_START] =   "VNMP_START",
     [FIP_ST_VNMP_PROBE1] =  "VNMP_PROBE1",
     [FIP_ST_VNMP_PROBE2] =  "VNMP_PROBE2",
     [FIP_ST_VNMP_CLAIM] =   "VNMP_CLAIM",
     [FIP_ST_VNMP_UP] =  "VNMP_UP",
 };
 
 static const char *fcoe_ctlr_state(enum fip_state state)
 {
     const char *cp = "unknown";
 
     if (state < ARRAY_SIZE(fcoe_ctlr_states))
         cp = fcoe_ctlr_states[state];
     if (!cp)
         cp = "unknown";
     return cp;
 }
 
 /**
  * fcoe_ctlr_set_state() - Set and do debug printing for the new FIP state.
  * @fip: The FCoE controller
  * @state: The new state
  */
 static void fcoe_ctlr_set_state(struct fcoe_ctlr *fip, enum fip_state state)
 {
     if (state == fip->state)
         return;
     if (fip->lp)
         LIBFCOE_FIP_DBG(fip, "state %s -> %s\n",
             fcoe_ctlr_state(fip->state), fcoe_ctlr_state(state));
     fip->state = state;
 }
 
 /**
  * fcoe_ctlr_mtu_valid() - Check if a FCF's MTU is valid
  * @fcf: The FCF to check
  *
  * Return non-zero if FCF fcoe_size has been validated.
  */
 static inline int fcoe_ctlr_mtu_valid(const struct fcoe_fcf *fcf)
 {
     return (fcf->flags & FIP_FL_SOL) != 0;
 }
 
 /**
  * fcoe_ctlr_fcf_usable() - Check if a FCF is usable
  * @fcf: The FCF to check
  *
  * Return non-zero if the FCF is usable.
  */
 static inline int fcoe_ctlr_fcf_usable(struct fcoe_fcf *fcf)
 {
     u16 flags = FIP_FL_SOL | FIP_FL_AVAIL;
 
     return (fcf->flags & flags) == flags;
 }
 
 /**
  * fcoe_ctlr_map_dest() - Set flag and OUI for mapping destination addresses
  * @fip: The FCoE controller
  */
 static void fcoe_ctlr_map_dest(struct fcoe_ctlr *fip)
 {
     if (fip->mode == FIP_MODE_VN2VN)
         hton24(fip->dest_addr, FIP_VN_FC_MAP);
     else
         hton24(fip->dest_addr, FIP_DEF_FC_MAP);
     hton24(fip->dest_addr + 3, 0);
     fip->map_dest = 1;
 }
 
 /**
  * fcoe_ctlr_init() - Initialize the FCoE Controller instance
  * @fip: The FCoE controller to initialize
  * @mode: FIP mode to set
  */
 void fcoe_ctlr_init(struct fcoe_ctlr *fip, enum fip_mode mode)
 {
     fcoe_ctlr_set_state(fip, FIP_ST_LINK_WAIT);
     fip->mode = mode;
     fip->fip_resp = false;
     INIT_LIST_HEAD(&fip->fcfs);
     mutex_init(&fip->ctlr_mutex);
     spin_lock_init(&fip->ctlr_lock);
     fip->flogi_oxid = FC_XID_UNKNOWN;
     timer_setup(&fip->timer, fcoe_ctlr_timeout, 0);
     INIT_WORK(&fip->timer_work, fcoe_ctlr_timer_work);
     INIT_WORK(&fip->recv_work, fcoe_ctlr_recv_work);
     skb_queue_head_init(&fip->fip_recv_list);
 }
 EXPORT_SYMBOL(fcoe_ctlr_init);
 
 /**
  * fcoe_sysfs_fcf_add() - Add a fcoe_fcf{,_device} to a fcoe_ctlr{,_device}
  * @new: The newly discovered FCF
  *
  * Called with fip->ctlr_mutex held
  */
 static int fcoe_sysfs_fcf_add(struct fcoe_fcf *new)
 {
     struct fcoe_ctlr *fip = new->fip;
     struct fcoe_ctlr_device *ctlr_dev;
     struct fcoe_fcf_device *temp, *fcf_dev;
     int rc = -ENOMEM;
 
     LIBFCOE_FIP_DBG(fip, "New FCF fab %16.16llx mac %pM\n",
             new->fabric_name, new->fcf_mac);
 
     temp = kzalloc(sizeof(*temp), GFP_KERNEL);
     if (!temp)
         goto out;
 
     temp->fabric_name = new->fabric_name;
     temp->switch_name = new->switch_name;
     temp->fc_map = new->fc_map;
     temp->vfid = new->vfid;
     memcpy(temp->mac, new->fcf_mac, ETH_ALEN);
     temp->priority = new->pri;
     temp->fka_period = new->fka_period;
     temp->selected = 0; /* default to unselected */
 
     /*
      * If ctlr_dev doesn't exist then it means we're a libfcoe user
      * who doesn't use fcoe_syfs and didn't allocate a fcoe_ctlr_device.
      * fnic would be an example of a driver with this behavior. In this
      * case we want to add the fcoe_fcf to the fcoe_ctlr list, but we
      * don't want to make sysfs changes.
      */
 
     ctlr_dev = fcoe_ctlr_to_ctlr_dev(fip);
     if (ctlr_dev) {
         mutex_lock(&ctlr_dev->lock);
         fcf_dev = fcoe_fcf_device_add(ctlr_dev, temp);
         if (unlikely(!fcf_dev)) {
             rc = -ENOMEM;
             mutex_unlock(&ctlr_dev->lock);
             goto out;
         }
 
         /*
          * The fcoe_sysfs layer can return a CONNECTED fcf that
          * has a priv (fcf was never deleted) or a CONNECTED fcf
          * that doesn't have a priv (fcf was deleted). However,
          * libfcoe will always delete FCFs before trying to add
          * them. This is ensured because both recv_adv and
          * age_fcfs are protected by the the fcoe_ctlr's mutex.
          * This means that we should never get a FCF with a
          * non-NULL priv pointer.
          */
         BUG_ON(fcf_dev->priv);
 
         fcf_dev->priv = new;
         new->fcf_dev = fcf_dev;
         mutex_unlock(&ctlr_dev->lock);
     }
 
     list_add(&new->list, &fip->fcfs);
     fip->fcf_count++;
     rc = 0;
 
 out:
     kfree(temp);
     return rc;
 }
 
 /**
  * fcoe_sysfs_fcf_del() - Remove a fcoe_fcf{,_device} to a fcoe_ctlr{,_device}
  * @new: The FCF to be removed
  *
  * Called with fip->ctlr_mutex held
  */
 static void fcoe_sysfs_fcf_del(struct fcoe_fcf *new)
 {
     struct fcoe_ctlr *fip = new->fip;
     struct fcoe_ctlr_device *cdev;
     struct fcoe_fcf_device *fcf_dev;
 
     list_del(&new->list);
     fip->fcf_count--;
 
     /*
      * If ctlr_dev doesn't exist then it means we're a libfcoe user
      * who doesn't use fcoe_syfs and didn't allocate a fcoe_ctlr_device
      * or a fcoe_fcf_device.
      *
      * fnic would be an example of a driver with this behavior. In this
      * case we want to remove the fcoe_fcf from the fcoe_ctlr list (above),
      * but we don't want to make sysfs changes.
      */
     cdev = fcoe_ctlr_to_ctlr_dev(fip);
     if (cdev) {
         mutex_lock(&cdev->lock);
         fcf_dev = fcoe_fcf_to_fcf_dev(new);
         WARN_ON(!fcf_dev);
         new->fcf_dev = NULL;
         fcoe_fcf_device_delete(fcf_dev);
         mutex_unlock(&cdev->lock);
     }
     kfree(new);
 }
 
 /**
  * fcoe_ctlr_reset_fcfs() - Reset and free all FCFs for a controller
  * @fip: The FCoE controller whose FCFs are to be reset
  *
  * Called with &fcoe_ctlr lock held.
  */
 static void fcoe_ctlr_reset_fcfs(struct fcoe_ctlr *fip)
 {
     struct fcoe_fcf *fcf;
     struct fcoe_fcf *next;
 
     fip->sel_fcf = NULL;
     list_for_each_entry_safe(fcf, next, &fip->fcfs, list) {
         fcoe_sysfs_fcf_del(fcf);
     }
     WARN_ON(fip->fcf_count);
 
     fip->sel_time = 0;
 }
 
 /**
  * fcoe_ctlr_destroy() - Disable and tear down a FCoE controller
  * @fip: The FCoE controller to tear down
  *
  * This is called by FCoE drivers before freeing the &fcoe_ctlr.
  *
  * The receive handler will have been deleted before this to guarantee
  * that no more recv_work will be scheduled.
  *
  * The timer routine will simply return once we set FIP_ST_DISABLED.
  * This guarantees that no further timeouts or work will be scheduled.
  */
 void fcoe_ctlr_destroy(struct fcoe_ctlr *fip)
 {
     cancel_work_sync(&fip->recv_work);
     skb_queue_purge(&fip->fip_recv_list);
 
     mutex_lock(&fip->ctlr_mutex);
     fcoe_ctlr_set_state(fip, FIP_ST_DISABLED);
     fcoe_ctlr_reset_fcfs(fip);
     mutex_unlock(&fip->ctlr_mutex);
     del_timer_sync(&fip->timer);
     cancel_work_sync(&fip->timer_work);
 }
 EXPORT_SYMBOL(fcoe_ctlr_destroy);
 
 /**
  * fcoe_ctlr_announce() - announce new FCF selection
  * @fip: The FCoE controller
  *
  * Also sets the destination MAC for FCoE and control packets
  *
  * Called with neither ctlr_mutex nor ctlr_lock held.
  */
 static void fcoe_ctlr_announce(struct fcoe_ctlr *fip)
 {
     struct fcoe_fcf *sel;
     struct fcoe_fcf *fcf;
 
     mutex_lock(&fip->ctlr_mutex);
     spin_lock_bh(&fip->ctlr_lock);
 
     kfree_skb(fip->flogi_req);
     fip->flogi_req = NULL;
     list_for_each_entry(fcf, &fip->fcfs, list)
         fcf->flogi_sent = 0;
 
     spin_unlock_bh(&fip->ctlr_lock);
     sel = fip->sel_fcf;
 
     if (sel && ether_addr_equal(sel->fcf_mac, fip->dest_addr))
         goto unlock;
     if (!is_zero_ether_addr(fip->dest_addr)) {
         printk(KERN_NOTICE "libfcoe: host%d: "
                "FIP Fibre-Channel Forwarder MAC %pM deselected\n",
                fip->lp->host->host_no, fip->dest_addr);
         eth_zero_addr(fip->dest_addr);
     }
     if (sel) {
         printk(KERN_INFO "libfcoe: host%d: FIP selected "
                "Fibre-Channel Forwarder MAC %pM\n",
                fip->lp->host->host_no, sel->fcf_mac);
         memcpy(fip->dest_addr, sel->fcoe_mac, ETH_ALEN);
         fip->map_dest = 0;
     }
 unlock:
     mutex_unlock(&fip->ctlr_mutex);
 }
 
 /**
  * fcoe_ctlr_fcoe_size() - Return the maximum FCoE size required for VN_Port
  * @fip: The FCoE controller to get the maximum FCoE size from
  *
  * Returns the maximum packet size including the FCoE header and trailer,
  * but not including any Ethernet or VLAN headers.
  */
 static inline u32 fcoe_ctlr_fcoe_size(struct fcoe_ctlr *fip)
 {
     /*
      * Determine the max FCoE frame size allowed, including
      * FCoE header and trailer.
      * Note:  lp->mfs is currently the payload size, not the frame size.
      */
     return fip->lp->mfs + sizeof(struct fc_frame_header) +
         sizeof(struct fcoe_hdr) + sizeof(struct fcoe_crc_eof);
 }
 
 /**
  * fcoe_ctlr_solicit() - Send a FIP solicitation
  * @fip: The FCoE controller to send the solicitation on
  * @fcf: The destination FCF (if NULL, a multicast solicitation is sent)
  */
 static void fcoe_ctlr_solicit(struct fcoe_ctlr *fip, struct fcoe_fcf *fcf)
 {
     struct sk_buff *skb;
     struct fip_sol {
         struct ethhdr eth;
         struct fip_header fip;
         struct {
             struct fip_mac_desc mac;
             struct fip_wwn_desc wwnn;
             struct fip_size_desc size;
         } __packed desc;
     }  __packed * sol;
     u32 fcoe_size;
 
     skb = dev_alloc_skb(sizeof(*sol));
     if (!skb)
         return;
 
     sol = (struct fip_sol *)skb->data;
 
     memset(sol, 0, sizeof(*sol));
     memcpy(sol->eth.h_dest, fcf ? fcf->fcf_mac : fcoe_all_fcfs, ETH_ALEN);
     memcpy(sol->eth.h_source, fip->ctl_src_addr, ETH_ALEN);
     sol->eth.h_proto = htons(ETH_P_FIP);
 
     sol->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER);
     sol->fip.fip_op = htons(FIP_OP_DISC);
     sol->fip.fip_subcode = FIP_SC_SOL;
     sol->fip.fip_dl_len = htons(sizeof(sol->desc) / FIP_BPW);
     sol->fip.fip_flags = htons(FIP_FL_FPMA);
     if (fip->spma)
         sol->fip.fip_flags |= htons(FIP_FL_SPMA);
 
     sol->desc.mac.fd_desc.fip_dtype = FIP_DT_MAC;
     sol->desc.mac.fd_desc.fip_dlen = sizeof(sol->desc.mac) / FIP_BPW;
     memcpy(sol->desc.mac.fd_mac, fip->ctl_src_addr, ETH_ALEN);
 
     sol->desc.wwnn.fd_desc.fip_dtype = FIP_DT_NAME;
     sol->desc.wwnn.fd_desc.fip_dlen = sizeof(sol->desc.wwnn) / FIP_BPW;
     put_unaligned_be64(fip->lp->wwnn, &sol->desc.wwnn.fd_wwn);
 
     fcoe_size = fcoe_ctlr_fcoe_size(fip);
     sol->desc.size.fd_desc.fip_dtype = FIP_DT_FCOE_SIZE;
     sol->desc.size.fd_desc.fip_dlen = sizeof(sol->desc.size) / FIP_BPW;
     sol->desc.size.fd_size = htons(fcoe_size);
 
     skb_put(skb, sizeof(*sol));
     skb->protocol = htons(ETH_P_FIP);
     skb->priority = fip->priority;
     skb_reset_mac_header(skb);
     skb_reset_network_header(skb);
     fip->send(fip, skb);
 
     if (!fcf)
         fip->sol_time = jiffies;
 }
 
 /**
  * fcoe_ctlr_link_up() - Start FCoE controller
  * @fip: The FCoE controller to start
  *
  * Called from the LLD when the network link is ready.
  */
 void fcoe_ctlr_link_up(struct fcoe_ctlr *fip)
 {
     mutex_lock(&fip->ctlr_mutex);
     if (fip->state == FIP_ST_NON_FIP || fip->state == FIP_ST_AUTO) {
         mutex_unlock(&fip->ctlr_mutex);
         fc_linkup(fip->lp);
     } else if (fip->state == FIP_ST_LINK_WAIT) {
         if (fip->mode == FIP_MODE_NON_FIP)
             fcoe_ctlr_set_state(fip, FIP_ST_NON_FIP);
         else
             fcoe_ctlr_set_state(fip, FIP_ST_AUTO);
         switch (fip->mode) {
         default:
             LIBFCOE_FIP_DBG(fip, "invalid mode %d\n", fip->mode);
             fallthrough;
         case FIP_MODE_AUTO:
             LIBFCOE_FIP_DBG(fip, "%s", "setting AUTO mode.\n");
             fallthrough;
         case FIP_MODE_FABRIC:
         case FIP_MODE_NON_FIP:
             mutex_unlock(&fip->ctlr_mutex);
             fc_linkup(fip->lp);
             fcoe_ctlr_solicit(fip, NULL);
             break;
         case FIP_MODE_VN2VN:
             fcoe_ctlr_vn_start(fip);
             mutex_unlock(&fip->ctlr_mutex);
             fc_linkup(fip->lp);
             break;
         }
     } else
         mutex_unlock(&fip->ctlr_mutex);
 }
 EXPORT_SYMBOL(fcoe_ctlr_link_up);
 
 /**
  * fcoe_ctlr_reset() - Reset a FCoE controller
  * @fip:       The FCoE controller to reset
  */
 static void fcoe_ctlr_reset(struct fcoe_ctlr *fip)
 {
     fcoe_ctlr_reset_fcfs(fip);
     del_timer(&fip->timer);
     fip->ctlr_ka_time = 0;
     fip->port_ka_time = 0;
     fip->sol_time = 0;
     fip->flogi_oxid = FC_XID_UNKNOWN;
     fcoe_ctlr_map_dest(fip);
 }
 
 /**
  * fcoe_ctlr_link_down() - Stop a FCoE controller
  * @fip: The FCoE controller to be stopped
  *
  * Returns non-zero if the link was up and now isn't.
  *
  * Called from the LLD when the network link is not ready.
  * There may be multiple calls while the link is down.
  */
 int fcoe_ctlr_link_down(struct fcoe_ctlr *fip)
 {
     int link_dropped;
 
     LIBFCOE_FIP_DBG(fip, "link down.\n");
     mutex_lock(&fip->ctlr_mutex);
     fcoe_ctlr_reset(fip);
     link_dropped = fip->state != FIP_ST_LINK_WAIT;
     fcoe_ctlr_set_state(fip, FIP_ST_LINK_WAIT);
     mutex_unlock(&fip->ctlr_mutex);
 
     if (link_dropped)
         fc_linkdown(fip->lp);
     return link_dropped;
 }
 EXPORT_SYMBOL(fcoe_ctlr_link_down);
 
 /**
  * fcoe_ctlr_send_keep_alive() - Send a keep-alive to the selected FCF
  * @fip:   The FCoE controller to send the FKA on
  * @lport: libfc fc_lport to send from
  * @ports: 0 for controller keep-alive, 1 for port keep-alive
  * @sa:    The source MAC address
  *
  * A controller keep-alive is sent every fka_period (typically 8 seconds).
  * The source MAC is the native MAC address.
  *
  * A port keep-alive is sent every 90 seconds while logged in.
  * The source MAC is the assigned mapped source address.
  * The destination is the FCF's F-port.
  */
 static void fcoe_ctlr_send_keep_alive(struct fcoe_ctlr *fip,
                       struct fc_lport *lport,
                       int ports, u8 *sa)
 {
     struct sk_buff *skb;
     struct fip_kal {
         struct ethhdr eth;
         struct fip_header fip;
         struct fip_mac_desc mac;
     } __packed * kal;
     struct fip_vn_desc *vn;
     u32 len;
     struct fc_lport *lp;
     struct fcoe_fcf *fcf;
 
     fcf = fip->sel_fcf;
     lp = fip->lp;
     if (!fcf || (ports && !lp->port_id))
         return;
 
     len = sizeof(*kal) + ports * sizeof(*vn);
     skb = dev_alloc_skb(len);
     if (!skb)
         return;
 
     kal = (struct fip_kal *)skb->data;
     memset(kal, 0, len);
     memcpy(kal->eth.h_dest, fcf->fcf_mac, ETH_ALEN);
     memcpy(kal->eth.h_source, sa, ETH_ALEN);
     kal->eth.h_proto = htons(ETH_P_FIP);
 
     kal->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER);
     kal->fip.fip_op = htons(FIP_OP_CTRL);
     kal->fip.fip_subcode = FIP_SC_KEEP_ALIVE;
     kal->fip.fip_dl_len = htons((sizeof(kal->mac) +
                      ports * sizeof(*vn)) / FIP_BPW);
     kal->fip.fip_flags = htons(FIP_FL_FPMA);
     if (fip->spma)
         kal->fip.fip_flags |= htons(FIP_FL_SPMA);
 
     kal->mac.fd_desc.fip_dtype = FIP_DT_MAC;
     kal->mac.fd_desc.fip_dlen = sizeof(kal->mac) / FIP_BPW;
     memcpy(kal->mac.fd_mac, fip->ctl_src_addr, ETH_ALEN);
     if (ports) {
         vn = (struct fip_vn_desc *)(kal + 1);
         vn->fd_desc.fip_dtype = FIP_DT_VN_ID;
         vn->fd_desc.fip_dlen = sizeof(*vn) / FIP_BPW;
         memcpy(vn->fd_mac, fip->get_src_addr(lport), ETH_ALEN);
         hton24(vn->fd_fc_id, lport->port_id);
         put_unaligned_be64(lport->wwpn, &vn->fd_wwpn);
     }
     skb_put(skb, len);
     skb->protocol = htons(ETH_P_FIP);
     skb->priority = fip->priority;
     skb_reset_mac_header(skb);
     skb_reset_network_header(skb);
     fip->send(fip, skb);
 }
 
 /**
  * fcoe_ctlr_encaps() - Encapsulate an ELS frame for FIP, without sending it
  * @fip:   The FCoE controller for the ELS frame
  * @lport: The local port
  * @dtype: The FIP descriptor type for the frame
  * @skb:   The FCoE ELS frame including FC header but no FCoE headers
  * @d_id:  The destination port ID.
  *
  * Returns non-zero error code on failure.
  *
  * The caller must check that the length is a multiple of 4.
  *
  * The @skb must have enough headroom (28 bytes) and tailroom (8 bytes).
  * Headroom includes the FIP encapsulation description, FIP header, and
  * Ethernet header.  The tailroom is for the FIP MAC descriptor.
  */
 static int fcoe_ctlr_encaps(struct fcoe_ctlr *fip, struct fc_lport *lport,
                 u8 dtype, struct sk_buff *skb, u32 d_id)
 {
     struct fip_encaps_head {
         struct ethhdr eth;
         struct fip_header fip;
         struct fip_encaps encaps;
     } __packed * cap;
     struct fc_frame_header *fh;
     struct fip_mac_desc *mac;
     struct fcoe_fcf *fcf;
     size_t dlen;
     u16 fip_flags;
     u8 op;
 
     fh = (struct fc_frame_header *)skb->data;
     op = *(u8 *)(fh + 1);
     dlen = sizeof(struct fip_encaps) + skb->len;    /* len before push */
     cap = skb_push(skb, sizeof(*cap));
     memset(cap, 0, sizeof(*cap));
 
     if (lport->point_to_multipoint) {
         if (fcoe_ctlr_vn_lookup(fip, d_id, cap->eth.h_dest))
             return -ENODEV;
         fip_flags = 0;
     } else {
         fcf = fip->sel_fcf;
         if (!fcf)
             return -ENODEV;
         fip_flags = fcf->flags;
         fip_flags &= fip->spma ? FIP_FL_SPMA | FIP_FL_FPMA :
                      FIP_FL_FPMA;
         if (!fip_flags)
             return -ENODEV;
         memcpy(cap->eth.h_dest, fcf->fcf_mac, ETH_ALEN);
     }
     memcpy(cap->eth.h_source, fip->ctl_src_addr, ETH_ALEN);
     cap->eth.h_proto = htons(ETH_P_FIP);
 
     cap->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER);
     cap->fip.fip_op = htons(FIP_OP_LS);
     if (op == ELS_LS_ACC || op == ELS_LS_RJT)
         cap->fip.fip_subcode = FIP_SC_REP;
     else
         cap->fip.fip_subcode = FIP_SC_REQ;
     cap->fip.fip_flags = htons(fip_flags);
 
     cap->encaps.fd_desc.fip_dtype = dtype;
     cap->encaps.fd_desc.fip_dlen = dlen / FIP_BPW;
 
     if (op != ELS_LS_RJT) {
         dlen += sizeof(*mac);
         mac = skb_put_zero(skb, sizeof(*mac));
         mac->fd_desc.fip_dtype = FIP_DT_MAC;
         mac->fd_desc.fip_dlen = sizeof(*mac) / FIP_BPW;
         if (dtype != FIP_DT_FLOGI && dtype != FIP_DT_FDISC) {
             memcpy(mac->fd_mac, fip->get_src_addr(lport), ETH_ALEN);
         } else if (fip->mode == FIP_MODE_VN2VN) {
             hton24(mac->fd_mac, FIP_VN_FC_MAP);
             hton24(mac->fd_mac + 3, fip->port_id);
         } else if (fip_flags & FIP_FL_SPMA) {
             LIBFCOE_FIP_DBG(fip, "FLOGI/FDISC sent with SPMA\n");
             memcpy(mac->fd_mac, fip->ctl_src_addr, ETH_ALEN);
         } else {
             LIBFCOE_FIP_DBG(fip, "FLOGI/FDISC sent with FPMA\n");
             /* FPMA only FLOGI.  Must leave the MAC desc zeroed. */
         }
     }
     cap->fip.fip_dl_len = htons(dlen / FIP_BPW);
 
     skb->protocol = htons(ETH_P_FIP);
     skb->priority = fip->priority;
     skb_reset_mac_header(skb);
     skb_reset_network_header(skb);
     return 0;
 }
 
 /**
  * fcoe_ctlr_els_send() - Send an ELS frame encapsulated by FIP if appropriate.
  * @fip:    FCoE controller.
  * @lport:  libfc fc_lport to send from
  * @skb:    FCoE ELS frame including FC header but no FCoE headers.
  *
  * Returns a non-zero error code if the frame should not be sent.
  * Returns zero if the caller should send the frame with FCoE encapsulation.
  *
  * The caller must check that the length is a multiple of 4.
  * The SKB must have enough headroom (28 bytes) and tailroom (8 bytes).
  * The the skb must also be an fc_frame.
  *
  * This is called from the lower-level driver with spinlocks held,
  * so we must not take a mutex here.
  */
 int fcoe_ctlr_els_send(struct fcoe_ctlr *fip, struct fc_lport *lport,
                struct sk_buff *skb)
 {
     struct fc_frame *fp;
     struct fc_frame_header *fh;
     u16 old_xid;
     u8 op;
     u8 mac[ETH_ALEN];
 
     fp = container_of(skb, struct fc_frame, skb);
     fh = (struct fc_frame_header *)skb->data;
     op = *(u8 *)(fh + 1);
 
     if (op == ELS_FLOGI && fip->mode != FIP_MODE_VN2VN) {
         old_xid = fip->flogi_oxid;
         fip->flogi_oxid = ntohs(fh->fh_ox_id);
         if (fip->state == FIP_ST_AUTO) {
             if (old_xid == FC_XID_UNKNOWN)
                 fip->flogi_count = 0;
             fip->flogi_count++;
             if (fip->flogi_count < 3)
                 goto drop;
             fcoe_ctlr_map_dest(fip);
             return 0;
         }
         if (fip->state == FIP_ST_NON_FIP)
             fcoe_ctlr_map_dest(fip);
     }
 
     if (fip->state == FIP_ST_NON_FIP)
         return 0;
     if (!fip->sel_fcf && fip->mode != FIP_MODE_VN2VN)
         goto drop;
     switch (op) {
     case ELS_FLOGI:
         op = FIP_DT_FLOGI;
         if (fip->mode == FIP_MODE_VN2VN)
             break;
         spin_lock_bh(&fip->ctlr_lock);
         kfree_skb(fip->flogi_req);
         fip->flogi_req = skb;
         fip->flogi_req_send = 1;
         spin_unlock_bh(&fip->ctlr_lock);
         schedule_work(&fip->timer_work);
         return -EINPROGRESS;
     case ELS_FDISC:
         if (ntoh24(fh->fh_s_id))
             return 0;
         op = FIP_DT_FDISC;
         break;
     case ELS_LOGO:
         if (fip->mode == FIP_MODE_VN2VN) {
             if (fip->state != FIP_ST_VNMP_UP)
                 goto drop;
             if (ntoh24(fh->fh_d_id) == FC_FID_FLOGI)
                 goto drop;
         } else {
             if (fip->state != FIP_ST_ENABLED)
                 return 0;
             if (ntoh24(fh->fh_d_id) != FC_FID_FLOGI)
                 return 0;
         }
         op = FIP_DT_LOGO;
         break;
     case ELS_LS_ACC:
         /*
          * If non-FIP, we may have gotten an SID by accepting an FLOGI
          * from a point-to-point connection.  Switch to using
          * the source mac based on the SID.  The destination
          * MAC in this case would have been set by receiving the
          * FLOGI.
          */
         if (fip->state == FIP_ST_NON_FIP) {
             if (fip->flogi_oxid == FC_XID_UNKNOWN)
                 return 0;
             fip->flogi_oxid = FC_XID_UNKNOWN;
             fc_fcoe_set_mac(mac, fh->fh_d_id);
             fip->update_mac(lport, mac);
         }
         fallthrough;
     case ELS_LS_RJT:
         op = fr_encaps(fp);
         if (op)
             break;
         return 0;
     default:
         if (fip->state != FIP_ST_ENABLED &&
             fip->state != FIP_ST_VNMP_UP)
             goto drop;
         return 0;
     }
     LIBFCOE_FIP_DBG(fip, "els_send op %u d_id %x\n",
             op, ntoh24(fh->fh_d_id));
     if (fcoe_ctlr_encaps(fip, lport, op, skb, ntoh24(fh->fh_d_id)))
         goto drop;
     fip->send(fip, skb);
     return -EINPROGRESS;
 drop:
     LIBFCOE_FIP_DBG(fip, "drop els_send op %u d_id %x\n",
             op, ntoh24(fh->fh_d_id));
     kfree_skb(skb);
     return -EINVAL;
 }
 EXPORT_SYMBOL(fcoe_ctlr_els_send);
 
 /**
  * fcoe_ctlr_age_fcfs() - Reset and free all old FCFs for a controller
  * @fip: The FCoE controller to free FCFs on
  *
  * Called with lock held and preemption disabled.
  *
  * An FCF is considered old if we have missed two advertisements.
  * That is, there have been no valid advertisement from it for 2.5
  * times its keep-alive period.
  *
  * In addition, determine the time when an FCF selection can occur.
  *
  * Also, increment the MissDiscAdvCount when no advertisement is received
  * for the corresponding FCF for 1.5 * FKA_ADV_PERIOD (FC-BB-5 LESB).
  *
  * Returns the time in jiffies for the next call.
  */
 static unsigned long fcoe_ctlr_age_fcfs(struct fcoe_ctlr *fip)
 {
     struct fcoe_fcf *fcf;
     struct fcoe_fcf *next;
     unsigned long next_timer = jiffies + msecs_to_jiffies(FIP_VN_KA_PERIOD);
     unsigned long deadline;
     unsigned long sel_time = 0;
     struct list_head del_list;
 
     INIT_LIST_HEAD(&del_list);
 
     list_for_each_entry_safe(fcf, next, &fip->fcfs, list) {
         deadline = fcf->time + fcf->fka_period + fcf->fka_period / 2;
         if (fip->sel_fcf == fcf) {
             if (time_after(jiffies, deadline)) {
                 u64 miss_cnt;
 
                 miss_cnt = this_cpu_inc_return(fip->lp->stats->MissDiscAdvCount);
                 printk(KERN_INFO "libfcoe: host%d: "
                        "Missing Discovery Advertisement "
                        "for fab %16.16llx count %lld\n",
                        fip->lp->host->host_no, fcf->fabric_name,
                        miss_cnt);
             } else if (time_after(next_timer, deadline))
                 next_timer = deadline;
         }
 
         deadline += fcf->fka_period;
         if (time_after_eq(jiffies, deadline)) {
             if (fip->sel_fcf == fcf)
                 fip->sel_fcf = NULL;
             /*
              * Move to delete list so we can call
              * fcoe_sysfs_fcf_del (which can sleep)
              * after the put_cpu().
              */
             list_del(&fcf->list);
             list_add(&fcf->list, &del_list);
             this_cpu_inc(fip->lp->stats->VLinkFailureCount);
         } else {
             if (time_after(next_timer, deadline))
                 next_timer = deadline;
             if (fcoe_ctlr_mtu_valid(fcf) &&
                 (!sel_time || time_before(sel_time, fcf->time)))
                 sel_time = fcf->time;
         }
     }
 
     list_for_each_entry_safe(fcf, next, &del_list, list) {
         /* Removes fcf from current list */
         fcoe_sysfs_fcf_del(fcf);
     }
 
     if (sel_time && !fip->sel_fcf && !fip->sel_time) {
         sel_time += msecs_to_jiffies(FCOE_CTLR_START_DELAY);
         fip->sel_time = sel_time;
     }
 
     return next_timer;
 }
 
 /**
  * fcoe_ctlr_parse_adv() - Decode a FIP advertisement into a new FCF entry
  * @fip: The FCoE controller receiving the advertisement
  * @skb: The received FIP advertisement frame
  * @fcf: The resulting FCF entry
  *
  * Returns zero on a valid parsed advertisement,
  * otherwise returns non zero value.
  */
 static int fcoe_ctlr_parse_adv(struct fcoe_ctlr *fip,
                    struct sk_buff *skb, struct fcoe_fcf *fcf)
 {
     struct fip_header *fiph;
     struct fip_desc *desc = NULL;
     struct fip_wwn_desc *wwn;
     struct fip_fab_desc *fab;
     struct fip_fka_desc *fka;
     unsigned long t;
     size_t rlen;
     size_t dlen;
     u32 desc_mask;
 
     memset(fcf, 0, sizeof(*fcf));
     fcf->fka_period = msecs_to_jiffies(FCOE_CTLR_DEF_FKA);
 
     fiph = (struct fip_header *)skb->data;
     fcf->flags = ntohs(fiph->fip_flags);
 
     /*
      * mask of required descriptors. validating each one clears its bit.
      */
     desc_mask = BIT(FIP_DT_PRI) | BIT(FIP_DT_MAC) | BIT(FIP_DT_NAME) |
             BIT(FIP_DT_FAB) | BIT(FIP_DT_FKA);
 
     rlen = ntohs(fiph->fip_dl_len) * 4;
     if (rlen + sizeof(*fiph) > skb->len)
         return -EINVAL;
 
     desc = (struct fip_desc *)(fiph + 1);
     while (rlen > 0) {
         dlen = desc->fip_dlen * FIP_BPW;
         if (dlen < sizeof(*desc) || dlen > rlen)
             return -EINVAL;
         /* Drop Adv if there are duplicate critical descriptors */
         if ((desc->fip_dtype < 32) &&
             !(desc_mask & 1U << desc->fip_dtype)) {
             LIBFCOE_FIP_DBG(fip, "Duplicate Critical "
                     "Descriptors in FIP adv\n");
             return -EINVAL;
         }
         switch (desc->fip_dtype) {
         case FIP_DT_PRI:
             if (dlen != sizeof(struct fip_pri_desc))
                 goto len_err;
             fcf->pri = ((struct fip_pri_desc *)desc)->fd_pri;
             desc_mask &= ~BIT(FIP_DT_PRI);
             break;
         case FIP_DT_MAC:
             if (dlen != sizeof(struct fip_mac_desc))
                 goto len_err;
             memcpy(fcf->fcf_mac,
                    ((struct fip_mac_desc *)desc)->fd_mac,
                    ETH_ALEN);
             memcpy(fcf->fcoe_mac, fcf->fcf_mac, ETH_ALEN);
             if (!is_valid_ether_addr(fcf->fcf_mac)) {
                 LIBFCOE_FIP_DBG(fip,
                     "Invalid MAC addr %pM in FIP adv\n",
                     fcf->fcf_mac);
                 return -EINVAL;
             }
             desc_mask &= ~BIT(FIP_DT_MAC);
             break;
         case FIP_DT_NAME:
             if (dlen != sizeof(struct fip_wwn_desc))
                 goto len_err;
             wwn = (struct fip_wwn_desc *)desc;
             fcf->switch_name = get_unaligned_be64(&wwn->fd_wwn);
             desc_mask &= ~BIT(FIP_DT_NAME);
             break;
         case FIP_DT_FAB:
             if (dlen != sizeof(struct fip_fab_desc))
                 goto len_err;
             fab = (struct fip_fab_desc *)desc;
             fcf->fabric_name = get_unaligned_be64(&fab->fd_wwn);
             fcf->vfid = ntohs(fab->fd_vfid);
             fcf->fc_map = ntoh24(fab->fd_map);
             desc_mask &= ~BIT(FIP_DT_FAB);
             break;
         case FIP_DT_FKA:
             if (dlen != sizeof(struct fip_fka_desc))
                 goto len_err;
             fka = (struct fip_fka_desc *)desc;
             if (fka->fd_flags & FIP_FKA_ADV_D)
                 fcf->fd_flags = 1;
             t = ntohl(fka->fd_fka_period);
             if (t >= FCOE_CTLR_MIN_FKA)
                 fcf->fka_period = msecs_to_jiffies(t);
             desc_mask &= ~BIT(FIP_DT_FKA);
             break;
         case FIP_DT_MAP_OUI:
         case FIP_DT_FCOE_SIZE:
         case FIP_DT_FLOGI:
         case FIP_DT_FDISC:
         case FIP_DT_LOGO:
         case FIP_DT_ELP:
         default:
             LIBFCOE_FIP_DBG(fip, "unexpected descriptor type %x "
                     "in FIP adv\n", desc->fip_dtype);
             /* standard says ignore unknown descriptors >= 128 */
             if (desc->fip_dtype < FIP_DT_NON_CRITICAL)
                 return -EINVAL;
             break;
         }
         desc = (struct fip_desc *)((char *)desc + dlen);
         rlen -= dlen;
     }
     if (!fcf->fc_map || (fcf->fc_map & 0x10000))
         return -EINVAL;
     if (!fcf->switch_name)
         return -EINVAL;
     if (desc_mask) {
         LIBFCOE_FIP_DBG(fip, "adv missing descriptors mask %x\n",
                 desc_mask);
         return -EINVAL;
     }
     return 0;
 
 len_err:
     LIBFCOE_FIP_DBG(fip, "FIP length error in descriptor type %x len %zu\n",
             desc->fip_dtype, dlen);
     return -EINVAL;
 }
 
 /**
  * fcoe_ctlr_recv_adv() - Handle an incoming advertisement
  * @fip: The FCoE controller receiving the advertisement
  * @skb: The received FIP packet
  */
 static void fcoe_ctlr_recv_adv(struct fcoe_ctlr *fip, struct sk_buff *skb)
 {
     struct fcoe_fcf *fcf;
     struct fcoe_fcf new;
     unsigned long sol_tov = msecs_to_jiffies(FCOE_CTLR_SOL_TOV);
     int first = 0;
     int mtu_valid;
     int found = 0;
     int rc = 0;
 
     if (fcoe_ctlr_parse_adv(fip, skb, &new))
         return;
 
     mutex_lock(&fip->ctlr_mutex);
     first = list_empty(&fip->fcfs);
     list_for_each_entry(fcf, &fip->fcfs, list) {
         if (fcf->switch_name == new.switch_name &&
             fcf->fabric_name == new.fabric_name &&
             fcf->fc_map == new.fc_map &&
             ether_addr_equal(fcf->fcf_mac, new.fcf_mac)) {
             found = 1;
             break;
         }
     }
     if (!found) {
         if (fip->fcf_count >= FCOE_CTLR_FCF_LIMIT)
             goto out;
 
         fcf = kmalloc(sizeof(*fcf), GFP_ATOMIC);
         if (!fcf)
             goto out;
 
         memcpy(fcf, &new, sizeof(new));
         fcf->fip = fip;
         rc = fcoe_sysfs_fcf_add(fcf);
         if (rc) {
             printk(KERN_ERR "Failed to allocate sysfs instance "
                    "for FCF, fab %16.16llx mac %pM\n",
                    new.fabric_name, new.fcf_mac);
             kfree(fcf);
             goto out;
         }
     } else {
         /*
          * Update the FCF's keep-alive descriptor flags.
          * Other flag changes from new advertisements are
          * ignored after a solicited advertisement is
          * received and the FCF is selectable (usable).
          */
         fcf->fd_flags = new.fd_flags;
         if (!fcoe_ctlr_fcf_usable(fcf))
             fcf->flags = new.flags;
 
         if (fcf == fip->sel_fcf && !fcf->fd_flags) {
             fip->ctlr_ka_time -= fcf->fka_period;
             fip->ctlr_ka_time += new.fka_period;
             if (time_before(fip->ctlr_ka_time, fip->timer.expires))
                 mod_timer(&fip->timer, fip->ctlr_ka_time);
         }
         fcf->fka_period = new.fka_period;
         memcpy(fcf->fcf_mac, new.fcf_mac, ETH_ALEN);
     }
 
     mtu_valid = fcoe_ctlr_mtu_valid(fcf);
     fcf->time = jiffies;
     if (!found)
         LIBFCOE_FIP_DBG(fip, "New FCF fab %16.16llx mac %pM\n",
                 fcf->fabric_name, fcf->fcf_mac);
 
     /*
      * If this advertisement is not solicited and our max receive size
      * hasn't been verified, send a solicited advertisement.
      */
     if (!mtu_valid)
         fcoe_ctlr_solicit(fip, fcf);
 
     /*
      * If its been a while since we did a solicit, and this is
      * the first advertisement we've received, do a multicast
      * solicitation to gather as many advertisements as we can
      * before selection occurs.
      */
     if (first && time_after(jiffies, fip->sol_time + sol_tov))
         fcoe_ctlr_solicit(fip, NULL);
 
     /*
      * Put this FCF at the head of the list for priority among equals.
      * This helps in the case of an NPV switch which insists we use
      * the FCF that answers multicast solicitations, not the others that
      * are sending periodic multicast advertisements.
      */
     if (mtu_valid)
         list_move(&fcf->list, &fip->fcfs);
 
     /*
      * If this is the first validated FCF, note the time and
      * set a timer to trigger selection.
      */
     if (mtu_valid && !fip->sel_fcf && !fip->sel_time &&
         fcoe_ctlr_fcf_usable(fcf)) {
         fip->sel_time = jiffies +
             msecs_to_jiffies(FCOE_CTLR_START_DELAY);
         if (!timer_pending(&fip->timer) ||
             time_before(fip->sel_time, fip->timer.expires))
             mod_timer(&fip->timer, fip->sel_time);
     }
 
 out:
     mutex_unlock(&fip->ctlr_mutex);
 }
 
 /**
  * fcoe_ctlr_recv_els() - Handle an incoming FIP encapsulated ELS frame
  * @fip: The FCoE controller which received the packet
  * @skb: The received FIP packet
  */
 static void fcoe_ctlr_recv_els(struct fcoe_ctlr *fip, struct sk_buff *skb)
 {
     struct fc_lport *lport = fip->lp;
     struct fip_header *fiph;
     struct fc_frame *fp = (struct fc_frame *)skb;
     struct fc_frame_header *fh = NULL;
     struct fip_desc *desc;
     struct fip_encaps *els;
     struct fcoe_fcf *sel;
     enum fip_desc_type els_dtype = 0;
     u8 els_op;
     u8 sub;
     u8 granted_mac[ETH_ALEN] = { 0 };
     size_t els_len = 0;
     size_t rlen;
     size_t dlen;
     u32 desc_mask = 0;
     u32 desc_cnt = 0;
 
     fiph = (struct fip_header *)skb->data;
     sub = fiph->fip_subcode;
     if (sub != FIP_SC_REQ && sub != FIP_SC_REP)
         goto drop;
 
     rlen = ntohs(fiph->fip_dl_len) * 4;
     if (rlen + sizeof(*fiph) > skb->len)
         goto drop;
 
     desc = (struct fip_desc *)(fiph + 1);
     while (rlen > 0) {
         desc_cnt++;
         dlen = desc->fip_dlen * FIP_BPW;
         if (dlen < sizeof(*desc) || dlen > rlen)
             goto drop;
         /* Drop ELS if there are duplicate critical descriptors */
         if (desc->fip_dtype < 32) {
             if ((desc->fip_dtype != FIP_DT_MAC) &&
                 (desc_mask & 1U << desc->fip_dtype)) {
                 LIBFCOE_FIP_DBG(fip, "Duplicate Critical "
                         "Descriptors in FIP ELS\n");
                 goto drop;
             }
             desc_mask |= (1 << desc->fip_dtype);
         }
         switch (desc->fip_dtype) {
         case FIP_DT_MAC:
             sel = fip->sel_fcf;
             if (desc_cnt == 1) {
                 LIBFCOE_FIP_DBG(fip, "FIP descriptors "
                         "received out of order\n");
                 goto drop;
             }
             /*
              * Some switch implementations send two MAC descriptors,
              * with first MAC(granted_mac) being the FPMA, and the
              * second one(fcoe_mac) is used as destination address
              * for sending/receiving FCoE packets. FIP traffic is
              * sent using fip_mac. For regular switches, both
              * fip_mac and fcoe_mac would be the same.
              */
             if (desc_cnt == 2)
                 memcpy(granted_mac,
                        ((struct fip_mac_desc *)desc)->fd_mac,
                        ETH_ALEN);
 
             if (dlen != sizeof(struct fip_mac_desc))
                 goto len_err;
 
             if ((desc_cnt == 3) && (sel))
                 memcpy(sel->fcoe_mac,
                        ((struct fip_mac_desc *)desc)->fd_mac,
                        ETH_ALEN);
             break;
         case FIP_DT_FLOGI:
         case FIP_DT_FDISC:
         case FIP_DT_LOGO:
         case FIP_DT_ELP:
             if (desc_cnt != 1) {
                 LIBFCOE_FIP_DBG(fip, "FIP descriptors "
                         "received out of order\n");
                 goto drop;
             }
             if (fh)
                 goto drop;
             if (dlen < sizeof(*els) + sizeof(*fh) + 1)
                 goto len_err;
             els_len = dlen - sizeof(*els);
             els = (struct fip_encaps *)desc;
             fh = (struct fc_frame_header *)(els + 1);
             els_dtype = desc->fip_dtype;
             break;
         default:
             LIBFCOE_FIP_DBG(fip, "unexpected descriptor type %x "
                     "in FIP adv\n", desc->fip_dtype);
             /* standard says ignore unknown descriptors >= 128 */
             if (desc->fip_dtype < FIP_DT_NON_CRITICAL)
                 goto drop;
             if (desc_cnt <= 2) {
                 LIBFCOE_FIP_DBG(fip, "FIP descriptors "
                         "received out of order\n");
                 goto drop;
             }
             break;
         }
         desc = (struct fip_desc *)((char *)desc + dlen);
         rlen -= dlen;
     }
 
     if (!fh)
         goto drop;
     els_op = *(u8 *)(fh + 1);
 
     if ((els_dtype == FIP_DT_FLOGI || els_dtype == FIP_DT_FDISC) &&
         sub == FIP_SC_REP && fip->mode != FIP_MODE_VN2VN) {
         if (els_op == ELS_LS_ACC) {
             if (!is_valid_ether_addr(granted_mac)) {
                 LIBFCOE_FIP_DBG(fip,
                     "Invalid MAC address %pM in FIP ELS\n",
                     granted_mac);
                 goto drop;
             }
             memcpy(fr_cb(fp)->granted_mac, granted_mac, ETH_ALEN);
 
             if (fip->flogi_oxid == ntohs(fh->fh_ox_id)) {
                 fip->flogi_oxid = FC_XID_UNKNOWN;
                 if (els_dtype == FIP_DT_FLOGI)
                     fcoe_ctlr_announce(fip);
             }
         } else if (els_dtype == FIP_DT_FLOGI &&
                !fcoe_ctlr_flogi_retry(fip))
             goto drop;  /* retrying FLOGI so drop reject */
     }
 
     if ((desc_cnt == 0) || ((els_op != ELS_LS_RJT) &&
         (!(1U << FIP_DT_MAC & desc_mask)))) {
         LIBFCOE_FIP_DBG(fip, "Missing critical descriptors "
                 "in FIP ELS\n");
         goto drop;
     }
 
     /*
      * Convert skb into an fc_frame containing only the ELS.
      */
     skb_pull(skb, (u8 *)fh - skb->data);
     skb_trim(skb, els_len);
     fp = (struct fc_frame *)skb;
     fc_frame_init(fp);
     fr_sof(fp) = FC_SOF_I3;
     fr_eof(fp) = FC_EOF_T;
     fr_dev(fp) = lport;
     fr_encaps(fp) = els_dtype;
 
     this_cpu_inc(lport->stats->RxFrames);
     this_cpu_add(lport->stats->RxWords, skb->len / FIP_BPW);
 
     fc_exch_recv(lport, fp);
     return;
 
 len_err:
     LIBFCOE_FIP_DBG(fip, "FIP length error in descriptor type %x len %zu\n",
             desc->fip_dtype, dlen);
 drop:
     kfree_skb(skb);
 }
 
 /**
  * fcoe_ctlr_recv_clr_vlink() - Handle an incoming link reset frame
  * @fip: The FCoE controller that received the frame
  * @skb: The received FIP packet
  *
  * There may be multiple VN_Port descriptors.
  * The overall length has already been checked.
  */
 static void fcoe_ctlr_recv_clr_vlink(struct fcoe_ctlr *fip,
                      struct sk_buff *skb)
 {
     struct fip_desc *desc;
     struct fip_mac_desc *mp;
     struct fip_wwn_desc *wp;
     struct fip_vn_desc *vp;
     size_t rlen;
     size_t dlen;
     struct fcoe_fcf *fcf = fip->sel_fcf;
     struct fc_lport *lport = fip->lp;
     struct fc_lport *vn_port = NULL;
     u32 desc_mask;
     int num_vlink_desc;
     int reset_phys_port = 0;
     struct fip_vn_desc **vlink_desc_arr = NULL;
     struct fip_header *fh = (struct fip_header *)skb->data;
     struct ethhdr *eh = eth_hdr(skb);
 
     LIBFCOE_FIP_DBG(fip, "Clear Virtual Link received\n");
 
     if (!fcf) {
         /*
          * We are yet to select best FCF, but we got CVL in the
          * meantime. reset the ctlr and let it rediscover the FCF
          */
         LIBFCOE_FIP_DBG(fip, "Resetting fcoe_ctlr as FCF has not been "
             "selected yet\n");
         mutex_lock(&fip->ctlr_mutex);
         fcoe_ctlr_reset(fip);
         mutex_unlock(&fip->ctlr_mutex);
         return;
     }
 
     /*
      * If we've selected an FCF check that the CVL is from there to avoid
      * processing CVLs from an unexpected source.  If it is from an
      * unexpected source drop it on the floor.
      */
     if (!ether_addr_equal(eh->h_source, fcf->fcf_mac)) {
         LIBFCOE_FIP_DBG(fip, "Dropping CVL due to source address "
             "mismatch with FCF src=%pM\n", eh->h_source);
         return;
     }
 
     /*
      * If we haven't logged into the fabric but receive a CVL we should
      * reset everything and go back to solicitation.
      */
     if (!lport->port_id) {
         LIBFCOE_FIP_DBG(fip, "lport not logged in, resoliciting\n");
         mutex_lock(&fip->ctlr_mutex);
         fcoe_ctlr_reset(fip);
         mutex_unlock(&fip->ctlr_mutex);
         fc_lport_reset(fip->lp);
         fcoe_ctlr_solicit(fip, NULL);
         return;
     }
 
     /*
      * mask of required descriptors.  Validating each one clears its bit.
      */
     desc_mask = BIT(FIP_DT_MAC) | BIT(FIP_DT_NAME);
 
     rlen = ntohs(fh->fip_dl_len) * FIP_BPW;
     desc = (struct fip_desc *)(fh + 1);
 
     /*
      * Actually need to subtract 'sizeof(*mp) - sizeof(*wp)' from 'rlen'
      * before determining max Vx_Port descriptor but a buggy FCF could have
      * omitted either or both MAC Address and Name Identifier descriptors
      */
     num_vlink_desc = rlen / sizeof(*vp);
     if (num_vlink_desc)
         vlink_desc_arr = kmalloc_array(num_vlink_desc, sizeof(vp),
                            GFP_ATOMIC);
     if (!vlink_desc_arr)
         return;
     num_vlink_desc = 0;
 
     while (rlen >= sizeof(*desc)) {
         dlen = desc->fip_dlen * FIP_BPW;
         if (dlen > rlen)
             goto err;
         /* Drop CVL if there are duplicate critical descriptors */
         if ((desc->fip_dtype < 32) &&
             (desc->fip_dtype != FIP_DT_VN_ID) &&
             !(desc_mask & 1U << desc->fip_dtype)) {
             LIBFCOE_FIP_DBG(fip, "Duplicate Critical "
                     "Descriptors in FIP CVL\n");
             goto err;
         }
         switch (desc->fip_dtype) {
         case FIP_DT_MAC:
             mp = (struct fip_mac_desc *)desc;
             if (dlen < sizeof(*mp))
                 goto err;
             if (!ether_addr_equal(mp->fd_mac, fcf->fcf_mac))
                 goto err;
             desc_mask &= ~BIT(FIP_DT_MAC);
             break;
         case FIP_DT_NAME:
             wp = (struct fip_wwn_desc *)desc;
             if (dlen < sizeof(*wp))
                 goto err;
             if (get_unaligned_be64(&wp->fd_wwn) != fcf->switch_name)
                 goto err;
             desc_mask &= ~BIT(FIP_DT_NAME);
             break;
         case FIP_DT_VN_ID:
             vp = (struct fip_vn_desc *)desc;
             if (dlen < sizeof(*vp))
                 goto err;
             vlink_desc_arr[num_vlink_desc++] = vp;
             vn_port = fc_vport_id_lookup(lport,
                               ntoh24(vp->fd_fc_id));
             if (vn_port && (vn_port == lport)) {
                 mutex_lock(&fip->ctlr_mutex);
                 this_cpu_inc(lport->stats->VLinkFailureCount);
                 fcoe_ctlr_reset(fip);
                 mutex_unlock(&fip->ctlr_mutex);
             }
             break;
         default:
             /* standard says ignore unknown descriptors >= 128 */
             if (desc->fip_dtype < FIP_DT_NON_CRITICAL)
                 goto err;
             break;
         }
         desc = (struct fip_desc *)((char *)desc + dlen);
         rlen -= dlen;
     }
 
     /*
      * reset only if all required descriptors were present and valid.
      */
     if (desc_mask)
         LIBFCOE_FIP_DBG(fip, "missing descriptors mask %x\n",
                 desc_mask);
     else if (!num_vlink_desc) {
         LIBFCOE_FIP_DBG(fip, "CVL: no Vx_Port descriptor found\n");
         /*
          * No Vx_Port description. Clear all NPIV ports,
          * followed by physical port
          */
         mutex_lock(&fip->ctlr_mutex);
         this_cpu_inc(lport->stats->VLinkFailureCount);
         fcoe_ctlr_reset(fip);
         mutex_unlock(&fip->ctlr_mutex);
 
         mutex_lock(&lport->lp_mutex);
         list_for_each_entry(vn_port, &lport->vports, list)
             fc_lport_reset(vn_port);
         mutex_unlock(&lport->lp_mutex);
 
         fc_lport_reset(fip->lp);
         fcoe_ctlr_solicit(fip, NULL);
     } else {
         int i;
 
         LIBFCOE_FIP_DBG(fip, "performing Clear Virtual Link\n");
         for (i = 0; i < num_vlink_desc; i++) {
             vp = vlink_desc_arr[i];
             vn_port = fc_vport_id_lookup(lport,
                              ntoh24(vp->fd_fc_id));
             if (!vn_port)
                 continue;
 
             /*
              * 'port_id' is already validated, check MAC address and
              * wwpn
              */
             if (!ether_addr_equal(fip->get_src_addr(vn_port),
                           vp->fd_mac) ||
                 get_unaligned_be64(&vp->fd_wwpn) !=
                             vn_port->wwpn)
                 continue;
 
             if (vn_port == lport)
                 /*
                  * Physical port, defer processing till all
                  * listed NPIV ports are cleared
                  */
                 reset_phys_port = 1;
             else    /* NPIV port */
                 fc_lport_reset(vn_port);
         }
 
         if (reset_phys_port) {
             fc_lport_reset(fip->lp);
             fcoe_ctlr_solicit(fip, NULL);
         }
     }
 
 err:
     kfree(vlink_desc_arr);
 }
 
 /**
  * fcoe_ctlr_recv() - Receive a FIP packet
  * @fip: The FCoE controller that received the packet
  * @skb: The received FIP packet
  *
  * This may be called from either NET_RX_SOFTIRQ or IRQ.
  */
 void fcoe_ctlr_recv(struct fcoe_ctlr *fip, struct sk_buff *skb)
 {
     skb = skb_share_check(skb, GFP_ATOMIC);
     if (!skb)
         return;
     skb_queue_tail(&fip->fip_recv_list, skb);
     schedule_work(&fip->recv_work);
 }
 EXPORT_SYMBOL(fcoe_ctlr_recv);
 
 /**
  * fcoe_ctlr_recv_handler() - Receive a FIP frame
  * @fip: The FCoE controller that received the frame
  * @skb: The received FIP frame
  *
  * Returns non-zero if the frame is dropped.
  */
 static int fcoe_ctlr_recv_handler(struct fcoe_ctlr *fip, struct sk_buff *skb)
 {
     struct fip_header *fiph;
     struct ethhdr *eh;
     enum fip_state state;
     bool fip_vlan_resp = false;
     u16 op;
     u8 sub;
 
     if (skb_linearize(skb))
         goto drop;
     if (skb->len < sizeof(*fiph))
         goto drop;
     eh = eth_hdr(skb);
     if (fip->mode == FIP_MODE_VN2VN) {
         if (!ether_addr_equal(eh->h_dest, fip->ctl_src_addr) &&
             !ether_addr_equal(eh->h_dest, fcoe_all_vn2vn) &&
             !ether_addr_equal(eh->h_dest, fcoe_all_p2p))
             goto drop;
     } else if (!ether_addr_equal(eh->h_dest, fip->ctl_src_addr) &&
            !ether_addr_equal(eh->h_dest, fcoe_all_enode))
         goto drop;
     fiph = (struct fip_header *)skb->data;
     op = ntohs(fiph->fip_op);
     sub = fiph->fip_subcode;
 
     if (FIP_VER_DECAPS(fiph->fip_ver) != FIP_VER)
         goto drop;
     if (ntohs(fiph->fip_dl_len) * FIP_BPW + sizeof(*fiph) > skb->len)
         goto drop;
 
     mutex_lock(&fip->ctlr_mutex);
     state = fip->state;
     if (state == FIP_ST_AUTO) {
         fip->map_dest = 0;
         fcoe_ctlr_set_state(fip, FIP_ST_ENABLED);
         state = FIP_ST_ENABLED;
         LIBFCOE_FIP_DBG(fip, "Using FIP mode\n");
     }
     fip_vlan_resp = fip->fip_resp;
     mutex_unlock(&fip->ctlr_mutex);
 
     if (fip->mode == FIP_MODE_VN2VN && op == FIP_OP_VN2VN)
         return fcoe_ctlr_vn_recv(fip, skb);
 
     if (fip_vlan_resp && op == FIP_OP_VLAN) {
         LIBFCOE_FIP_DBG(fip, "fip vlan discovery\n");
         return fcoe_ctlr_vlan_recv(fip, skb);
     }
 
     if (state != FIP_ST_ENABLED && state != FIP_ST_VNMP_UP &&
         state != FIP_ST_VNMP_CLAIM)
         goto drop;
 
     if (op == FIP_OP_LS) {
         fcoe_ctlr_recv_els(fip, skb);   /* consumes skb */
         return 0;
     }
 
     if (state != FIP_ST_ENABLED)
         goto drop;
 
     if (op == FIP_OP_DISC && sub == FIP_SC_ADV)
         fcoe_ctlr_recv_adv(fip, skb);
     else if (op == FIP_OP_CTRL && sub == FIP_SC_CLR_VLINK)
         fcoe_ctlr_recv_clr_vlink(fip, skb);
     kfree_skb(skb);
     return 0;
 drop:
     kfree_skb(skb);
     return -1;
 }
 
 /**
  * fcoe_ctlr_select() - Select the best FCF (if possible)
  * @fip: The FCoE controller
  *
  * Returns the selected FCF, or NULL if none are usable.
  *
  * If there are conflicting advertisements, no FCF can be chosen.
  *
  * If there is already a selected FCF, this will choose a better one or
  * an equivalent one that hasn't already been sent a FLOGI.
  *
  * Called with lock held.
  */
 static struct fcoe_fcf *fcoe_ctlr_select(struct fcoe_ctlr *fip)
 {
     struct fcoe_fcf *fcf;
     struct fcoe_fcf *best = fip->sel_fcf;
 
     list_for_each_entry(fcf, &fip->fcfs, list) {
         LIBFCOE_FIP_DBG(fip, "consider FCF fab %16.16llx "
                 "VFID %d mac %pM map %x val %d "
                 "sent %u pri %u\n",
                 fcf->fabric_name, fcf->vfid, fcf->fcf_mac,
                 fcf->fc_map, fcoe_ctlr_mtu_valid(fcf),
                 fcf->flogi_sent, fcf->pri);
         if (!fcoe_ctlr_fcf_usable(fcf)) {
             LIBFCOE_FIP_DBG(fip, "FCF for fab %16.16llx "
                     "map %x %svalid %savailable\n",
                     fcf->fabric_name, fcf->fc_map,
                     (fcf->flags & FIP_FL_SOL) ? "" : "in",
                     (fcf->flags & FIP_FL_AVAIL) ?
                     "" : "un");
             continue;
         }
         if (!best || fcf->pri < best->pri || best->flogi_sent)
             best = fcf;
         if (fcf->fabric_name != best->fabric_name ||
             fcf->vfid != best->vfid ||
             fcf->fc_map != best->fc_map) {
             LIBFCOE_FIP_DBG(fip, "Conflicting fabric, VFID, "
                     "or FC-MAP\n");
             return NULL;
         }
     }
     fip->sel_fcf = best;
     if (best) {
         LIBFCOE_FIP_DBG(fip, "using FCF mac %pM\n", best->fcf_mac);
         fip->port_ka_time = jiffies +
             msecs_to_jiffies(FIP_VN_KA_PERIOD);
         fip->ctlr_ka_time = jiffies + best->fka_period;
         if (time_before(fip->ctlr_ka_time, fip->timer.expires))
             mod_timer(&fip->timer, fip->ctlr_ka_time);
     }
     return best;
 }
 
 /**
  * fcoe_ctlr_flogi_send_locked() - send FIP-encapsulated FLOGI to current FCF
  * @fip: The FCoE controller
  *
  * Returns non-zero error if it could not be sent.
  *
  * Called with ctlr_mutex and ctlr_lock held.
  * Caller must verify that fip->sel_fcf is not NULL.
  */
 static int fcoe_ctlr_flogi_send_locked(struct fcoe_ctlr *fip)
 {
     struct sk_buff *skb;
     struct sk_buff *skb_orig;
     struct fc_frame_header *fh;
     int error;
 
     skb_orig = fip->flogi_req;
     if (!skb_orig)
         return -EINVAL;
 
     /*
      * Clone and send the FLOGI request.  If clone fails, use original.
      */
     skb = skb_clone(skb_orig, GFP_ATOMIC);
     if (!skb) {
         skb = skb_orig;
         fip->flogi_req = NULL;
     }
     fh = (struct fc_frame_header *)skb->data;
     error = fcoe_ctlr_encaps(fip, fip->lp, FIP_DT_FLOGI, skb,
                  ntoh24(fh->fh_d_id));
     if (error) {
         kfree_skb(skb);
         return error;
     }
     fip->send(fip, skb);
     fip->sel_fcf->flogi_sent = 1;
     return 0;
 }
 
 /**
  * fcoe_ctlr_flogi_retry() - resend FLOGI request to a new FCF if possible
  * @fip: The FCoE controller
  *
  * Returns non-zero error code if there's no FLOGI request to retry or
  * no alternate FCF available.
  */
 static int fcoe_ctlr_flogi_retry(struct fcoe_ctlr *fip)
 {
     struct fcoe_fcf *fcf;
     int error;
 
     mutex_lock(&fip->ctlr_mutex);
     spin_lock_bh(&fip->ctlr_lock);
     LIBFCOE_FIP_DBG(fip, "re-sending FLOGI - reselect\n");
     fcf = fcoe_ctlr_select(fip);
     if (!fcf || fcf->flogi_sent) {
         kfree_skb(fip->flogi_req);
         fip->flogi_req = NULL;
         error = -ENOENT;
     } else {
         fcoe_ctlr_solicit(fip, NULL);
         error = fcoe_ctlr_flogi_send_locked(fip);
     }
     spin_unlock_bh(&fip->ctlr_lock);
     mutex_unlock(&fip->ctlr_mutex);
     return error;
 }
 
 
 /**
  * fcoe_ctlr_flogi_send() - Handle sending of FIP FLOGI.
  * @fip: The FCoE controller that timed out
  *
  * Done here because fcoe_ctlr_els_send() can't get mutex.
  *
  * Called with ctlr_mutex held.  The caller must not hold ctlr_lock.
  */
 static void fcoe_ctlr_flogi_send(struct fcoe_ctlr *fip)
 {
     struct fcoe_fcf *fcf;
 
     spin_lock_bh(&fip->ctlr_lock);
     fcf = fip->sel_fcf;
     if (!fcf || !fip->flogi_req_send)
         goto unlock;
 
     LIBFCOE_FIP_DBG(fip, "sending FLOGI\n");
 
     /*
      * If this FLOGI is being sent due to a timeout retry
      * to the same FCF as before, select a different FCF if possible.
      */
     if (fcf->flogi_sent) {
         LIBFCOE_FIP_DBG(fip, "sending FLOGI - reselect\n");
         fcf = fcoe_ctlr_select(fip);
         if (!fcf || fcf->flogi_sent) {
             LIBFCOE_FIP_DBG(fip, "sending FLOGI - clearing\n");
             list_for_each_entry(fcf, &fip->fcfs, list)
                 fcf->flogi_sent = 0;
             fcf = fcoe_ctlr_select(fip);
         }
     }
     if (fcf) {
         fcoe_ctlr_flogi_send_locked(fip);
         fip->flogi_req_send = 0;
     } else /* XXX */
         LIBFCOE_FIP_DBG(fip, "No FCF selected - defer send\n");
 unlock:
     spin_unlock_bh(&fip->ctlr_lock);
 }
 
 /**
  * fcoe_ctlr_timeout() - FIP timeout handler
  * @t: Timer context use to obtain the controller reference
  */
 static void fcoe_ctlr_timeout(struct timer_list *t)
 {
     struct fcoe_ctlr *fip = from_timer(fip, t, timer);
 
     schedule_work(&fip->timer_work);
 }
 
 /**
  * fcoe_ctlr_timer_work() - Worker thread function for timer work
  * @work: Handle to a FCoE controller
  *
  * Ages FCFs.  Triggers FCF selection if possible.
  * Sends keep-alives and resets.
  */
 static void fcoe_ctlr_timer_work(struct work_struct *work)
 {
     struct fcoe_ctlr *fip;
     struct fc_lport *vport;
     u8 *mac;
     u8 reset = 0;
     u8 send_ctlr_ka = 0;
     u8 send_port_ka = 0;
     struct fcoe_fcf *sel;
     struct fcoe_fcf *fcf;
     unsigned long next_timer;
 
     fip = container_of(work, struct fcoe_ctlr, timer_work);
     if (fip->mode == FIP_MODE_VN2VN)
         return fcoe_ctlr_vn_timeout(fip);
     mutex_lock(&fip->ctlr_mutex);
     if (fip->state == FIP_ST_DISABLED) {
         mutex_unlock(&fip->ctlr_mutex);
         return;
     }
 
     fcf = fip->sel_fcf;
     next_timer = fcoe_ctlr_age_fcfs(fip);
 
     sel = fip->sel_fcf;
     if (!sel && fip->sel_time) {
         if (time_after_eq(jiffies, fip->sel_time)) {
             sel = fcoe_ctlr_select(fip);
             fip->sel_time = 0;
         } else if (time_after(next_timer, fip->sel_time))
             next_timer = fip->sel_time;
     }
 
     if (sel && fip->flogi_req_send)
         fcoe_ctlr_flogi_send(fip);
     else if (!sel && fcf)
         reset = 1;
 
     if (sel && !sel->fd_flags) {
         if (time_after_eq(jiffies, fip->ctlr_ka_time)) {
             fip->ctlr_ka_time = jiffies + sel->fka_period;
             send_ctlr_ka = 1;
         }
         if (time_after(next_timer, fip->ctlr_ka_time))
             next_timer = fip->ctlr_ka_time;
 
         if (time_after_eq(jiffies, fip->port_ka_time)) {
             fip->port_ka_time = jiffies +
                 msecs_to_jiffies(FIP_VN_KA_PERIOD);
             send_port_ka = 1;
         }
         if (time_after(next_timer, fip->port_ka_time))
             next_timer = fip->port_ka_time;
     }
     if (!list_empty(&fip->fcfs))
         mod_timer(&fip->timer, next_timer);
     mutex_unlock(&fip->ctlr_mutex);
 
     if (reset) {
         fc_lport_reset(fip->lp);
         /* restart things with a solicitation */
         fcoe_ctlr_solicit(fip, NULL);
     }
 
     if (send_ctlr_ka)
         fcoe_ctlr_send_keep_alive(fip, NULL, 0, fip->ctl_src_addr);
 
     if (send_port_ka) {
         mutex_lock(&fip->lp->lp_mutex);
         mac = fip->get_src_addr(fip->lp);
         fcoe_ctlr_send_keep_alive(fip, fip->lp, 1, mac);
         list_for_each_entry(vport, &fip->lp->vports, list) {
             mac = fip->get_src_addr(vport);
             fcoe_ctlr_send_keep_alive(fip, vport, 1, mac);
         }
         mutex_unlock(&fip->lp->lp_mutex);
     }
 }
 
 /**
  * fcoe_ctlr_recv_work() - Worker thread function for receiving FIP frames
  * @recv_work: Handle to a FCoE controller
  */
 static void fcoe_ctlr_recv_work(struct work_struct *recv_work)
 {
     struct fcoe_ctlr *fip;
     struct sk_buff *skb;
 
     fip = container_of(recv_work, struct fcoe_ctlr, recv_work);
     while ((skb = skb_dequeue(&fip->fip_recv_list)))
         fcoe_ctlr_recv_handler(fip, skb);
 }
 
 /**
  * fcoe_ctlr_recv_flogi() - Snoop pre-FIP receipt of FLOGI response
  * @fip: The FCoE controller
  * @lport: The local port
  * @fp:  The FC frame to snoop
  *
  * Snoop potential response to FLOGI or even incoming FLOGI.
  *
  * The caller has checked that we are waiting for login as indicated
  * by fip->flogi_oxid != FC_XID_UNKNOWN.
  *
  * The caller is responsible for freeing the frame.
  * Fill in the granted_mac address.
  *
  * Return non-zero if the frame should not be delivered to libfc.
  */
 int fcoe_ctlr_recv_flogi(struct fcoe_ctlr *fip, struct fc_lport *lport,
              struct fc_frame *fp)
 {
     struct fc_frame_header *fh;
     u8 op;
     u8 *sa;
 
     sa = eth_hdr(&fp->skb)->h_source;
     fh = fc_frame_header_get(fp);
     if (fh->fh_type != FC_TYPE_ELS)
         return 0;
 
     op = fc_frame_payload_op(fp);
     if (op == ELS_LS_ACC && fh->fh_r_ctl == FC_RCTL_ELS_REP &&
         fip->flogi_oxid == ntohs(fh->fh_ox_id)) {
 
         mutex_lock(&fip->ctlr_mutex);
         if (fip->state != FIP_ST_AUTO && fip->state != FIP_ST_NON_FIP) {
             mutex_unlock(&fip->ctlr_mutex);
             return -EINVAL;
         }
         fcoe_ctlr_set_state(fip, FIP_ST_NON_FIP);
         LIBFCOE_FIP_DBG(fip,
                 "received FLOGI LS_ACC using non-FIP mode\n");
 
         /*
          * FLOGI accepted.
          * If the src mac addr is FC_OUI-based, then we mark the
          * address_mode flag to use FC_OUI-based Ethernet DA.
          * Otherwise we use the FCoE gateway addr
          */
         if (ether_addr_equal(sa, (u8[6])FC_FCOE_FLOGI_MAC)) {
             fcoe_ctlr_map_dest(fip);
         } else {
             memcpy(fip->dest_addr, sa, ETH_ALEN);
             fip->map_dest = 0;
         }
         fip->flogi_oxid = FC_XID_UNKNOWN;
         mutex_unlock(&fip->ctlr_mutex);
         fc_fcoe_set_mac(fr_cb(fp)->granted_mac, fh->fh_d_id);
     } else if (op == ELS_FLOGI && fh->fh_r_ctl == FC_RCTL_ELS_REQ && sa) {
         /*
          * Save source MAC for point-to-point responses.
          */
         mutex_lock(&fip->ctlr_mutex);
         if (fip->state == FIP_ST_AUTO || fip->state == FIP_ST_NON_FIP) {
             memcpy(fip->dest_addr, sa, ETH_ALEN);
             fip->map_dest = 0;
             if (fip->state == FIP_ST_AUTO)
                 LIBFCOE_FIP_DBG(fip, "received non-FIP FLOGI. "
                         "Setting non-FIP mode\n");
             fcoe_ctlr_set_state(fip, FIP_ST_NON_FIP);
         }
         mutex_unlock(&fip->ctlr_mutex);
     }
     return 0;
 }
 EXPORT_SYMBOL(fcoe_ctlr_recv_flogi);
 
 /**
  * fcoe_wwn_from_mac() - Converts a 48-bit IEEE MAC address to a 64-bit FC WWN
  * @mac:    The MAC address to convert
  * @scheme: The scheme to use when converting
  * @port:   The port indicator for converting
  *
  * Returns: u64 fc world wide name
  */
 u64 fcoe_wwn_from_mac(unsigned char mac[ETH_ALEN],
               unsigned int scheme, unsigned int port)
 {
     u64 wwn;
     u64 host_mac;
 
     /* The MAC is in NO, so flip only the low 48 bits */
     host_mac = ((u64) mac[0] << 40) |
         ((u64) mac[1] << 32) |
         ((u64) mac[2] << 24) |
         ((u64) mac[3] << 16) |
         ((u64) mac[4] << 8) |
         (u64) mac[5];
 
     WARN_ON(host_mac >= (1ULL << 48));
     wwn = host_mac | ((u64) scheme << 60);
     switch (scheme) {
     case 1:
         WARN_ON(port != 0);
         break;
     case 2:
         WARN_ON(port >= 0xfff);
         wwn |= (u64) port << 48;
         break;
     default:
         WARN_ON(1);
         break;
     }
 
     return wwn;
 }
 EXPORT_SYMBOL_GPL(fcoe_wwn_from_mac);
 
 /**
  * fcoe_ctlr_rport() - return the fcoe_rport for a given fc_rport_priv
  * @rdata: libfc remote port
  */
 static inline struct fcoe_rport *fcoe_ctlr_rport(struct fc_rport_priv *rdata)
 {
     return container_of(rdata, struct fcoe_rport, rdata);
 }
 
 /**
  * fcoe_ctlr_vn_send() - Send a FIP VN2VN Probe Request or Reply.
  * @fip: The FCoE controller
  * @sub: sub-opcode for probe request, reply, or advertisement.
  * @dest: The destination Ethernet MAC address
  * @min_len: minimum size of the Ethernet payload to be sent
  */
 static void fcoe_ctlr_vn_send(struct fcoe_ctlr *fip,
                   enum fip_vn2vn_subcode sub,
                   const u8 *dest, size_t min_len)
 {
     struct sk_buff *skb;
     struct fip_vn2vn_probe_frame {
         struct ethhdr eth;
         struct fip_header fip;
         struct fip_mac_desc mac;
         struct fip_wwn_desc wwnn;
         struct fip_vn_desc vn;
     } __packed * frame;
     struct fip_fc4_feat *ff;
     struct fip_size_desc *size;
     u32 fcp_feat;
     size_t len;
     size_t dlen;
 
     len = sizeof(*frame);
     dlen = 0;
     if (sub == FIP_SC_VN_CLAIM_NOTIFY || sub == FIP_SC_VN_CLAIM_REP) {
         dlen = sizeof(struct fip_fc4_feat) +
                sizeof(struct fip_size_desc);
         len += dlen;
     }
     dlen += sizeof(frame->mac) + sizeof(frame->wwnn) + sizeof(frame->vn);
     len = max(len, min_len + sizeof(struct ethhdr));
 
     skb = dev_alloc_skb(len);
     if (!skb)
         return;
 
     frame = (struct fip_vn2vn_probe_frame *)skb->data;
     memset(frame, 0, len);
     memcpy(frame->eth.h_dest, dest, ETH_ALEN);
 
     if (sub == FIP_SC_VN_BEACON) {
         hton24(frame->eth.h_source, FIP_VN_FC_MAP);
         hton24(frame->eth.h_source + 3, fip->port_id);
     } else {
         memcpy(frame->eth.h_source, fip->ctl_src_addr, ETH_ALEN);
     }
     frame->eth.h_proto = htons(ETH_P_FIP);
 
     frame->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER);
     frame->fip.fip_op = htons(FIP_OP_VN2VN);
     frame->fip.fip_subcode = sub;
     frame->fip.fip_dl_len = htons(dlen / FIP_BPW);
 
     frame->mac.fd_desc.fip_dtype = FIP_DT_MAC;
     frame->mac.fd_desc.fip_dlen = sizeof(frame->mac) / FIP_BPW;
     memcpy(frame->mac.fd_mac, fip->ctl_src_addr, ETH_ALEN);
 
     frame->wwnn.fd_desc.fip_dtype = FIP_DT_NAME;
     frame->wwnn.fd_desc.fip_dlen = sizeof(frame->wwnn) / FIP_BPW;
     put_unaligned_be64(fip->lp->wwnn, &frame->wwnn.fd_wwn);
 
     frame->vn.fd_desc.fip_dtype = FIP_DT_VN_ID;
     frame->vn.fd_desc.fip_dlen = sizeof(frame->vn) / FIP_BPW;
     hton24(frame->vn.fd_mac, FIP_VN_FC_MAP);
     hton24(frame->vn.fd_mac + 3, fip->port_id);
     hton24(frame->vn.fd_fc_id, fip->port_id);
     put_unaligned_be64(fip->lp->wwpn, &frame->vn.fd_wwpn);
 
     /*
      * For claims, add FC-4 features.
      * TBD: Add interface to get fc-4 types and features from libfc.
      */
     if (sub == FIP_SC_VN_CLAIM_NOTIFY || sub == FIP_SC_VN_CLAIM_REP) {
         ff = (struct fip_fc4_feat *)(frame + 1);
         ff->fd_desc.fip_dtype = FIP_DT_FC4F;
         ff->fd_desc.fip_dlen = sizeof(*ff) / FIP_BPW;
         ff->fd_fts = fip->lp->fcts;
 
         fcp_feat = 0;
         if (fip->lp->service_params & FCP_SPPF_INIT_FCN)
             fcp_feat |= FCP_FEAT_INIT;
         if (fip->lp->service_params & FCP_SPPF_TARG_FCN)
             fcp_feat |= FCP_FEAT_TARG;
         fcp_feat <<= (FC_TYPE_FCP * 4) % 32;
         ff->fd_ff.fd_feat[FC_TYPE_FCP * 4 / 32] = htonl(fcp_feat);
 
         size = (struct fip_size_desc *)(ff + 1);
         size->fd_desc.fip_dtype = FIP_DT_FCOE_SIZE;
         size->fd_desc.fip_dlen = sizeof(*size) / FIP_BPW;
         size->fd_size = htons(fcoe_ctlr_fcoe_size(fip));
     }
 
     skb_put(skb, len);
     skb->protocol = htons(ETH_P_FIP);
     skb->priority = fip->priority;
     skb_reset_mac_header(skb);
     skb_reset_network_header(skb);
 
     fip->send(fip, skb);
 }
 
 /**
  * fcoe_ctlr_vn_rport_callback - Event handler for rport events.
  * @lport: The lport which is receiving the event
  * @rdata: remote port private data
  * @event: The event that occurred
  *
  * Locking Note:  The rport lock must not be held when calling this function.
  */
 static void fcoe_ctlr_vn_rport_callback(struct fc_lport *lport,
                     struct fc_rport_priv *rdata,
                     enum fc_rport_event event)
 {
     struct fcoe_ctlr *fip = lport->disc.priv;
     struct fcoe_rport *frport = fcoe_ctlr_rport(rdata);
 
     LIBFCOE_FIP_DBG(fip, "vn_rport_callback %x event %d\n",
             rdata->ids.port_id, event);
 
     mutex_lock(&fip->ctlr_mutex);
     switch (event) {
     case RPORT_EV_READY:
         frport->login_count = 0;
         break;
     case RPORT_EV_LOGO:
     case RPORT_EV_FAILED:
     case RPORT_EV_STOP:
         frport->login_count++;
         if (frport->login_count > FCOE_CTLR_VN2VN_LOGIN_LIMIT) {
             LIBFCOE_FIP_DBG(fip,
                     "rport FLOGI limited port_id %6.6x\n",
                     rdata->ids.port_id);
             fc_rport_logoff(rdata);
         }
         break;
     default:
         break;
     }
     mutex_unlock(&fip->ctlr_mutex);
 }
 
 static struct fc_rport_operations fcoe_ctlr_vn_rport_ops = {
     .event_callback = fcoe_ctlr_vn_rport_callback,
 };
 
 /**
  * fcoe_ctlr_disc_stop_locked() - stop discovery in VN2VN mode
  * @lport: The local port
  *
  * Called with ctlr_mutex held.
  */
 static void fcoe_ctlr_disc_stop_locked(struct fc_lport *lport)
 {
     struct fc_rport_priv *rdata;
 
     mutex_lock(&lport->disc.disc_mutex);
     list_for_each_entry_rcu(rdata, &lport->disc.rports, peers) {
         if (kref_get_unless_zero(&rdata->kref)) {
             fc_rport_logoff(rdata);
             kref_put(&rdata->kref, fc_rport_destroy);
         }
     }
     lport->disc.disc_callback = NULL;
     mutex_unlock(&lport->disc.disc_mutex);
 }
 
 /**
  * fcoe_ctlr_disc_stop() - stop discovery in VN2VN mode
  * @lport: The local port
  *
  * Called through the local port template for discovery.
  * Called without the ctlr_mutex held.
  */
 static void fcoe_ctlr_disc_stop(struct fc_lport *lport)
 {
     struct fcoe_ctlr *fip = lport->disc.priv;
 
     mutex_lock(&fip->ctlr_mutex);
     fcoe_ctlr_disc_stop_locked(lport);
     mutex_unlock(&fip->ctlr_mutex);
 }
 
 /**
  * fcoe_ctlr_disc_stop_final() - stop discovery for shutdown in VN2VN mode
  * @lport: The local port
  *
  * Called through the local port template for discovery.
  * Called without the ctlr_mutex held.
  */
 static void fcoe_ctlr_disc_stop_final(struct fc_lport *lport)
 {
     fcoe_ctlr_disc_stop(lport);
     fc_rport_flush_queue();
     synchronize_rcu();
 }
 
 /**
  * fcoe_ctlr_vn_restart() - VN2VN probe restart with new port_id
  * @fip: The FCoE controller
  *
  * Called with fcoe_ctlr lock held.
  */
 static void fcoe_ctlr_vn_restart(struct fcoe_ctlr *fip)
 {
     unsigned long wait;
     u32 port_id;
 
     fcoe_ctlr_disc_stop_locked(fip->lp);
 
     /*
      * Get proposed port ID.
      * If this is the first try after link up, use any previous port_id.
      * If there was none, use the low bits of the port_name.
      * On subsequent tries, get the next random one.
      * Don't use reserved IDs, use another non-zero value, just as random.
      */
     port_id = fip->port_id;
     if (fip->probe_tries)
         port_id = prandom_u32_state(&fip->rnd_state) & 0xffff;
     else if (!port_id)
         port_id = fip->lp->wwpn & 0xffff;
     if (!port_id || port_id == 0xffff)
         port_id = 1;
     fip->port_id = port_id;
 
     if (fip->probe_tries < FIP_VN_RLIM_COUNT) {
         fip->probe_tries++;
         wait = prandom_u32() % FIP_VN_PROBE_WAIT;
     } else
         wait = FIP_VN_RLIM_INT;
     mod_timer(&fip->timer, jiffies + msecs_to_jiffies(wait));
     fcoe_ctlr_set_state(fip, FIP_ST_VNMP_START);
 }
 
 /**
  * fcoe_ctlr_vn_start() - Start in VN2VN mode
  * @fip: The FCoE controller
  *
  * Called with fcoe_ctlr lock held.
  */
 static void fcoe_ctlr_vn_start(struct fcoe_ctlr *fip)
 {
     fip->probe_tries = 0;
     prandom_seed_state(&fip->rnd_state, fip->lp->wwpn);
     fcoe_ctlr_vn_restart(fip);
 }
 
 /**
  * fcoe_ctlr_vn_parse - parse probe request or response
  * @fip: The FCoE controller
  * @skb: incoming packet
  * @frport: parsed FCoE rport from the probe request
  *
  * Returns non-zero error number on error.
  * Does not consume the packet.
  */
 static int fcoe_ctlr_vn_parse(struct fcoe_ctlr *fip,
                   struct sk_buff *skb,
                   struct fcoe_rport *frport)
 {
     struct fip_header *fiph;
     struct fip_desc *desc = NULL;
     struct fip_mac_desc *macd = NULL;
     struct fip_wwn_desc *wwn = NULL;
     struct fip_vn_desc *vn = NULL;
     struct fip_size_desc *size = NULL;
     size_t rlen;
     size_t dlen;
     u32 desc_mask = 0;
     u32 dtype;
     u8 sub;
 
     fiph = (struct fip_header *)skb->data;
     frport->flags = ntohs(fiph->fip_flags);
 
     sub = fiph->fip_subcode;
     switch (sub) {
     case FIP_SC_VN_PROBE_REQ:
     case FIP_SC_VN_PROBE_REP:
     case FIP_SC_VN_BEACON:
         desc_mask = BIT(FIP_DT_MAC) | BIT(FIP_DT_NAME) |
                 BIT(FIP_DT_VN_ID);
         break;
     case FIP_SC_VN_CLAIM_NOTIFY:
     case FIP_SC_VN_CLAIM_REP:
         desc_mask = BIT(FIP_DT_MAC) | BIT(FIP_DT_NAME) |
                 BIT(FIP_DT_VN_ID) | BIT(FIP_DT_FC4F) |
                 BIT(FIP_DT_FCOE_SIZE);
         break;
     default:
         LIBFCOE_FIP_DBG(fip, "vn_parse unknown subcode %u\n", sub);
         return -EINVAL;
     }
 
     rlen = ntohs(fiph->fip_dl_len) * 4;
     if (rlen + sizeof(*fiph) > skb->len)
         return -EINVAL;
 
     desc = (struct fip_desc *)(fiph + 1);
     while (rlen > 0) {
         dlen = desc->fip_dlen * FIP_BPW;
         if (dlen < sizeof(*desc) || dlen > rlen)
             return -EINVAL;
 
         dtype = desc->fip_dtype;
         if (dtype < 32) {
             if (!(desc_mask & BIT(dtype))) {
                 LIBFCOE_FIP_DBG(fip,
                         "unexpected or duplicated desc "
                         "desc type %u in "
                         "FIP VN2VN subtype %u\n",
                         dtype, sub);
                 return -EINVAL;
             }
             desc_mask &= ~BIT(dtype);
         }
 
         switch (dtype) {
         case FIP_DT_MAC:
             if (dlen != sizeof(struct fip_mac_desc))
                 goto len_err;
             macd = (struct fip_mac_desc *)desc;
             if (!is_valid_ether_addr(macd->fd_mac)) {
                 LIBFCOE_FIP_DBG(fip,
                     "Invalid MAC addr %pM in FIP VN2VN\n",
                      macd->fd_mac);
                 return -EINVAL;
             }
             memcpy(frport->enode_mac, macd->fd_mac, ETH_ALEN);
             break;
         case FIP_DT_NAME:
             if (dlen != sizeof(struct fip_wwn_desc))
                 goto len_err;
             wwn = (struct fip_wwn_desc *)desc;
             frport->rdata.ids.node_name =
                 get_unaligned_be64(&wwn->fd_wwn);
             break;
         case FIP_DT_VN_ID:
             if (dlen != sizeof(struct fip_vn_desc))
                 goto len_err;
             vn = (struct fip_vn_desc *)desc;
             memcpy(frport->vn_mac, vn->fd_mac, ETH_ALEN);
             frport->rdata.ids.port_id = ntoh24(vn->fd_fc_id);
             frport->rdata.ids.port_name =
                 get_unaligned_be64(&vn->fd_wwpn);
             break;
         case FIP_DT_FC4F:
             if (dlen != sizeof(struct fip_fc4_feat))
                 goto len_err;
             break;
         case FIP_DT_FCOE_SIZE:
             if (dlen != sizeof(struct fip_size_desc))
                 goto len_err;
             size = (struct fip_size_desc *)desc;
             frport->fcoe_len = ntohs(size->fd_size);
             break;
         default:
             LIBFCOE_FIP_DBG(fip, "unexpected descriptor type %x "
                     "in FIP probe\n", dtype);
             /* standard says ignore unknown descriptors >= 128 */
             if (dtype < FIP_DT_NON_CRITICAL)
                 return -EINVAL;
             break;
         }
         desc = (struct fip_desc *)((char *)desc + dlen);
         rlen -= dlen;
     }
     return 0;
 
 len_err:
     LIBFCOE_FIP_DBG(fip, "FIP length error in descriptor type %x len %zu\n",
             dtype, dlen);
     return -EINVAL;
 }
 
 /**
  * fcoe_ctlr_vn_send_claim() - send multicast FIP VN2VN Claim Notification.
  * @fip: The FCoE controller
  *
  * Called with ctlr_mutex held.
  */
 static void fcoe_ctlr_vn_send_claim(struct fcoe_ctlr *fip)
 {
     fcoe_ctlr_vn_send(fip, FIP_SC_VN_CLAIM_NOTIFY, fcoe_all_vn2vn, 0);
     fip->sol_time = jiffies;
 }
 
 /**
  * fcoe_ctlr_vn_probe_req() - handle incoming VN2VN probe request.
  * @fip: The FCoE controller
  * @frport: parsed FCoE rport from the probe request
  *
  * Called with ctlr_mutex held.
  */
 static void fcoe_ctlr_vn_probe_req(struct fcoe_ctlr *fip,
                    struct fcoe_rport *frport)
 {
     if (frport->rdata.ids.port_id != fip->port_id)
         return;
 
     switch (fip->state) {
     case FIP_ST_VNMP_CLAIM:
     case FIP_ST_VNMP_UP:
         LIBFCOE_FIP_DBG(fip, "vn_probe_req: send reply, state %x\n",
                 fip->state);
         fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REP,
                   frport->enode_mac, 0);
         break;
     case FIP_ST_VNMP_PROBE1:
     case FIP_ST_VNMP_PROBE2:
         /*
          * Decide whether to reply to the Probe.
          * Our selected address is never a "recorded" one, so
          * only reply if our WWPN is greater and the
          * Probe's REC bit is not set.
          * If we don't reply, we will change our address.
          */
         if (fip->lp->wwpn > frport->rdata.ids.port_name &&
             !(frport->flags & FIP_FL_REC_OR_P2P)) {
             LIBFCOE_FIP_DBG(fip, "vn_probe_req: "
                     "port_id collision\n");
             fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REP,
                       frport->enode_mac, 0);
             break;
         }
         fallthrough;
     case FIP_ST_VNMP_START:
         LIBFCOE_FIP_DBG(fip, "vn_probe_req: "
                 "restart VN2VN negotiation\n");
         fcoe_ctlr_vn_restart(fip);
         break;
     default:
         LIBFCOE_FIP_DBG(fip, "vn_probe_req: ignore state %x\n",
                 fip->state);
         break;
     }
 }
 
 /**
  * fcoe_ctlr_vn_probe_reply() - handle incoming VN2VN probe reply.
  * @fip: The FCoE controller
  * @frport: parsed FCoE rport from the probe request
  *
  * Called with ctlr_mutex held.
  */
 static void fcoe_ctlr_vn_probe_reply(struct fcoe_ctlr *fip,
                      struct fcoe_rport *frport)
 {
     if (frport->rdata.ids.port_id != fip->port_id)
         return;
     switch (fip->state) {
     case FIP_ST_VNMP_START:
     case FIP_ST_VNMP_PROBE1:
     case FIP_ST_VNMP_PROBE2:
     case FIP_ST_VNMP_CLAIM:
         LIBFCOE_FIP_DBG(fip, "vn_probe_reply: restart state %x\n",
                 fip->state);
         fcoe_ctlr_vn_restart(fip);
         break;
     case FIP_ST_VNMP_UP:
         LIBFCOE_FIP_DBG(fip, "vn_probe_reply: send claim notify\n");
         fcoe_ctlr_vn_send_claim(fip);
         break;
     default:
         break;
     }
 }
 
 /**
  * fcoe_ctlr_vn_add() - Add a VN2VN entry to the list, based on a claim reply.
  * @fip: The FCoE controller
  * @new: newly-parsed FCoE rport as a template for new rdata
  *
  * Called with ctlr_mutex held.
  */
 static void fcoe_ctlr_vn_add(struct fcoe_ctlr *fip, struct fcoe_rport *new)
 {
     struct fc_lport *lport = fip->lp;
     struct fc_rport_priv *rdata;
     struct fc_rport_identifiers *ids;
     struct fcoe_rport *frport;
     u32 port_id;
 
     port_id = new->rdata.ids.port_id;
     if (port_id == fip->port_id)
         return;
 
     mutex_lock(&lport->disc.disc_mutex);
     rdata = fc_rport_create(lport, port_id);
     if (!rdata) {
         mutex_unlock(&lport->disc.disc_mutex);
         return;
     }
     mutex_lock(&rdata->rp_mutex);
     mutex_unlock(&lport->disc.disc_mutex);
 
     rdata->ops = &fcoe_ctlr_vn_rport_ops;
     rdata->disc_id = lport->disc.disc_id;
 
     ids = &rdata->ids;
     if ((ids->port_name != -1 &&
          ids->port_name != new->rdata.ids.port_name) ||
         (ids->node_name != -1 &&
          ids->node_name != new->rdata.ids.node_name)) {
         mutex_unlock(&rdata->rp_mutex);
         LIBFCOE_FIP_DBG(fip, "vn_add rport logoff %6.6x\n", port_id);
         fc_rport_logoff(rdata);
         mutex_lock(&rdata->rp_mutex);
     }
     ids->port_name = new->rdata.ids.port_name;
     ids->node_name = new->rdata.ids.node_name;
     mutex_unlock(&rdata->rp_mutex);
 
     frport = fcoe_ctlr_rport(rdata);
     LIBFCOE_FIP_DBG(fip, "vn_add rport %6.6x %s state %d\n",
             port_id, frport->fcoe_len ? "old" : "new",
             rdata->rp_state);
     frport->fcoe_len = new->fcoe_len;
     frport->flags = new->flags;
     frport->login_count = new->login_count;
     memcpy(frport->enode_mac, new->enode_mac, ETH_ALEN);
     memcpy(frport->vn_mac, new->vn_mac, ETH_ALEN);
     frport->time = 0;
 }
 
 /**
  * fcoe_ctlr_vn_lookup() - Find VN remote port's MAC address
  * @fip: The FCoE controller
  * @port_id:  The port_id of the remote VN_node
  * @mac: buffer which will hold the VN_NODE destination MAC address, if found.
  *
  * Returns non-zero error if no remote port found.
  */
 static int fcoe_ctlr_vn_lookup(struct fcoe_ctlr *fip, u32 port_id, u8 *mac)
 {
     struct fc_lport *lport = fip->lp;
     struct fc_rport_priv *rdata;
     struct fcoe_rport *frport;
     int ret = -1;
 
     rdata = fc_rport_lookup(lport, port_id);
     if (rdata) {
         frport = fcoe_ctlr_rport(rdata);
         memcpy(mac, frport->enode_mac, ETH_ALEN);
         ret = 0;
         kref_put(&rdata->kref, fc_rport_destroy);
     }
     return ret;
 }
 
 /**
  * fcoe_ctlr_vn_claim_notify() - handle received FIP VN2VN Claim Notification
  * @fip: The FCoE controller
  * @new: newly-parsed FCoE rport as a template for new rdata
  *
  * Called with ctlr_mutex held.
  */
 static void fcoe_ctlr_vn_claim_notify(struct fcoe_ctlr *fip,
                       struct fcoe_rport *new)
 {
     if (new->flags & FIP_FL_REC_OR_P2P) {
         LIBFCOE_FIP_DBG(fip, "send probe req for P2P/REC\n");
         fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REQ, fcoe_all_vn2vn, 0);
         return;
     }
     switch (fip->state) {
     case FIP_ST_VNMP_START:
     case FIP_ST_VNMP_PROBE1:
     case FIP_ST_VNMP_PROBE2:
         if (new->rdata.ids.port_id == fip->port_id) {
             LIBFCOE_FIP_DBG(fip, "vn_claim_notify: "
                     "restart, state %d\n",
                     fip->state);
             fcoe_ctlr_vn_restart(fip);
         }
         break;
     case FIP_ST_VNMP_CLAIM:
     case FIP_ST_VNMP_UP:
         if (new->rdata.ids.port_id == fip->port_id) {
             if (new->rdata.ids.port_name > fip->lp->wwpn) {
                 LIBFCOE_FIP_DBG(fip, "vn_claim_notify: "
                         "restart, port_id collision\n");
                 fcoe_ctlr_vn_restart(fip);
                 break;
             }
             LIBFCOE_FIP_DBG(fip, "vn_claim_notify: "
                     "send claim notify\n");
             fcoe_ctlr_vn_send_claim(fip);
             break;
         }
         LIBFCOE_FIP_DBG(fip, "vn_claim_notify: send reply to %x\n",
                 new->rdata.ids.port_id);
         fcoe_ctlr_vn_send(fip, FIP_SC_VN_CLAIM_REP, new->enode_mac,
                   min((u32)new->fcoe_len,
                       fcoe_ctlr_fcoe_size(fip)));
         fcoe_ctlr_vn_add(fip, new);
         break;
     default:
         LIBFCOE_FIP_DBG(fip, "vn_claim_notify: "
                 "ignoring claim from %x\n",
                 new->rdata.ids.port_id);
         break;
     }
 }
 
 /**
  * fcoe_ctlr_vn_claim_resp() - handle received Claim Response
  * @fip: The FCoE controller that received the frame
  * @new: newly-parsed FCoE rport from the Claim Response
  *
  * Called with ctlr_mutex held.
  */
 static void fcoe_ctlr_vn_claim_resp(struct fcoe_ctlr *fip,
                     struct fcoe_rport *new)
 {
     LIBFCOE_FIP_DBG(fip, "claim resp from from rport %x - state %s\n",
             new->rdata.ids.port_id, fcoe_ctlr_state(fip->state));
     if (fip->state == FIP_ST_VNMP_UP || fip->state == FIP_ST_VNMP_CLAIM)
         fcoe_ctlr_vn_add(fip, new);
 }
 
 /**
  * fcoe_ctlr_vn_beacon() - handle received beacon.
  * @fip: The FCoE controller that received the frame
  * @new: newly-parsed FCoE rport from the Beacon
  *
  * Called with ctlr_mutex held.
  */
 static void fcoe_ctlr_vn_beacon(struct fcoe_ctlr *fip,
                 struct fcoe_rport *new)
 {
     struct fc_lport *lport = fip->lp;
     struct fc_rport_priv *rdata;
     struct fcoe_rport *frport;
 
     if (new->flags & FIP_FL_REC_OR_P2P) {
         LIBFCOE_FIP_DBG(fip, "p2p beacon while in vn2vn mode\n");
         fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REQ, fcoe_all_vn2vn, 0);
         return;
     }
     rdata = fc_rport_lookup(lport, new->rdata.ids.port_id);
     if (rdata) {
         if (rdata->ids.node_name == new->rdata.ids.node_name &&
             rdata->ids.port_name == new->rdata.ids.port_name) {
             frport = fcoe_ctlr_rport(rdata);
 
             LIBFCOE_FIP_DBG(fip, "beacon from rport %x\n",
                     rdata->ids.port_id);
             if (!frport->time && fip->state == FIP_ST_VNMP_UP) {
                 LIBFCOE_FIP_DBG(fip, "beacon expired "
                         "for rport %x\n",
                         rdata->ids.port_id);
                 fc_rport_login(rdata);
             }
             frport->time = jiffies;
         }
         kref_put(&rdata->kref, fc_rport_destroy);
         return;
     }
     if (fip->state != FIP_ST_VNMP_UP)
         return;
 
     /*
      * Beacon from a new neighbor.
      * Send a claim notify if one hasn't been sent recently.
      * Don't add the neighbor yet.
      */
     LIBFCOE_FIP_DBG(fip, "beacon from new rport %x. sending claim notify\n",
             new->rdata.ids.port_id);
     if (time_after(jiffies,
                fip->sol_time + msecs_to_jiffies(FIP_VN_ANN_WAIT)))
         fcoe_ctlr_vn_send_claim(fip);
 }
 
 /**
  * fcoe_ctlr_vn_age() - Check for VN_ports without recent beacons
  * @fip: The FCoE controller
  *
  * Called with ctlr_mutex held.
  * Called only in state FIP_ST_VNMP_UP.
  * Returns the soonest time for next age-out or a time far in the future.
  */
 static unsigned long fcoe_ctlr_vn_age(struct fcoe_ctlr *fip)
 {
     struct fc_lport *lport = fip->lp;
     struct fc_rport_priv *rdata;
     struct fcoe_rport *frport;
     unsigned long next_time;
     unsigned long deadline;
 
     next_time = jiffies + msecs_to_jiffies(FIP_VN_BEACON_INT * 10);
     mutex_lock(&lport->disc.disc_mutex);
     list_for_each_entry_rcu(rdata, &lport->disc.rports, peers) {
         if (!kref_get_unless_zero(&rdata->kref))
             continue;
         frport = fcoe_ctlr_rport(rdata);
         if (!frport->time) {
             kref_put(&rdata->kref, fc_rport_destroy);
             continue;
         }
         deadline = frport->time +
                msecs_to_jiffies(FIP_VN_BEACON_INT * 25 / 10);
         if (time_after_eq(jiffies, deadline)) {
             frport->time = 0;
             LIBFCOE_FIP_DBG(fip,
                 "port %16.16llx fc_id %6.6x beacon expired\n",
                 rdata->ids.port_name, rdata->ids.port_id);
             fc_rport_logoff(rdata);
         } else if (time_before(deadline, next_time))
             next_time = deadline;
         kref_put(&rdata->kref, fc_rport_destroy);
     }
     mutex_unlock(&lport->disc.disc_mutex);
     return next_time;
 }
 
 /**
  * fcoe_ctlr_vn_recv() - Receive a FIP frame
  * @fip: The FCoE controller that received the frame
  * @skb: The received FIP frame
  *
  * Returns non-zero if the frame is dropped.
  * Always consumes the frame.
  */
 static int fcoe_ctlr_vn_recv(struct fcoe_ctlr *fip, struct sk_buff *skb)
 {
     struct fip_header *fiph;
     enum fip_vn2vn_subcode sub;
     struct fcoe_rport frport = { };
     int rc, vlan_id = 0;
 
     fiph = (struct fip_header *)skb->data;
     sub = fiph->fip_subcode;
 
     if (fip->lp->vlan)
         vlan_id = skb_vlan_tag_get_id(skb);
 
     if (vlan_id && vlan_id != fip->lp->vlan) {
         LIBFCOE_FIP_DBG(fip, "vn_recv drop frame sub %x vlan %d\n",
                 sub, vlan_id);
         rc = -EAGAIN;
         goto drop;
     }
 
     rc = fcoe_ctlr_vn_parse(fip, skb, &frport);
     if (rc) {
         LIBFCOE_FIP_DBG(fip, "vn_recv vn_parse error %d\n", rc);
         goto drop;
     }
 
     mutex_lock(&fip->ctlr_mutex);
     switch (sub) {
     case FIP_SC_VN_PROBE_REQ:
         fcoe_ctlr_vn_probe_req(fip, &frport);
         break;
     case FIP_SC_VN_PROBE_REP:
         fcoe_ctlr_vn_probe_reply(fip, &frport);
         break;
     case FIP_SC_VN_CLAIM_NOTIFY:
         fcoe_ctlr_vn_claim_notify(fip, &frport);
         break;
     case FIP_SC_VN_CLAIM_REP:
         fcoe_ctlr_vn_claim_resp(fip, &frport);
         break;
     case FIP_SC_VN_BEACON:
         fcoe_ctlr_vn_beacon(fip, &frport);
         break;
     default:
         LIBFCOE_FIP_DBG(fip, "vn_recv unknown subcode %d\n", sub);
         rc = -1;
         break;
     }
     mutex_unlock(&fip->ctlr_mutex);
 drop:
     kfree_skb(skb);
     return rc;
 }
 
 /**
  * fcoe_ctlr_vlan_parse - parse vlan discovery request or response
  * @fip: The FCoE controller
  * @skb: incoming packet
  * @frport: parsed FCoE rport from the probe request
  *
  * Returns non-zero error number on error.
  * Does not consume the packet.
  */
 static int fcoe_ctlr_vlan_parse(struct fcoe_ctlr *fip,
                   struct sk_buff *skb,
                   struct fcoe_rport *frport)
 {
     struct fip_header *fiph;
     struct fip_desc *desc = NULL;
     struct fip_mac_desc *macd = NULL;
     struct fip_wwn_desc *wwn = NULL;
     size_t rlen;
     size_t dlen;
     u32 desc_mask = 0;
     u32 dtype;
     u8 sub;
 
     fiph = (struct fip_header *)skb->data;
     frport->flags = ntohs(fiph->fip_flags);
 
     sub = fiph->fip_subcode;
     switch (sub) {
     case FIP_SC_VL_REQ:
         desc_mask = BIT(FIP_DT_MAC) | BIT(FIP_DT_NAME);
         break;
     default:
         LIBFCOE_FIP_DBG(fip, "vn_parse unknown subcode %u\n", sub);
         return -EINVAL;
     }
 
     rlen = ntohs(fiph->fip_dl_len) * 4;
     if (rlen + sizeof(*fiph) > skb->len)
         return -EINVAL;
 
     desc = (struct fip_desc *)(fiph + 1);
     while (rlen > 0) {
         dlen = desc->fip_dlen * FIP_BPW;
         if (dlen < sizeof(*desc) || dlen > rlen)
             return -EINVAL;
 
         dtype = desc->fip_dtype;
         if (dtype < 32) {
             if (!(desc_mask & BIT(dtype))) {
                 LIBFCOE_FIP_DBG(fip,
                         "unexpected or duplicated desc "
                         "desc type %u in "
                         "FIP VN2VN subtype %u\n",
                         dtype, sub);
                 return -EINVAL;
             }
             desc_mask &= ~BIT(dtype);
         }
 
         switch (dtype) {
         case FIP_DT_MAC:
             if (dlen != sizeof(struct fip_mac_desc))
                 goto len_err;
             macd = (struct fip_mac_desc *)desc;
             if (!is_valid_ether_addr(macd->fd_mac)) {
                 LIBFCOE_FIP_DBG(fip,
                     "Invalid MAC addr %pM in FIP VN2VN\n",
                      macd->fd_mac);
                 return -EINVAL;
             }
             memcpy(frport->enode_mac, macd->fd_mac, ETH_ALEN);
             break;
         case FIP_DT_NAME:
             if (dlen != sizeof(struct fip_wwn_desc))
                 goto len_err;
             wwn = (struct fip_wwn_desc *)desc;
             frport->rdata.ids.node_name =
                 get_unaligned_be64(&wwn->fd_wwn);
             break;
         default:
             LIBFCOE_FIP_DBG(fip, "unexpected descriptor type %x "
                     "in FIP probe\n", dtype);
             /* standard says ignore unknown descriptors >= 128 */
             if (dtype < FIP_DT_NON_CRITICAL)
                 return -EINVAL;
             break;
         }
         desc = (struct fip_desc *)((char *)desc + dlen);
         rlen -= dlen;
     }
     return 0;
 
 len_err:
     LIBFCOE_FIP_DBG(fip, "FIP length error in descriptor type %x len %zu\n",
             dtype, dlen);
     return -EINVAL;
 }
 
 /**
  * fcoe_ctlr_vlan_send() - Send a FIP VLAN Notification
  * @fip: The FCoE controller
  * @sub: sub-opcode for vlan notification or vn2vn vlan notification
  * @dest: The destination Ethernet MAC address
  */
 static void fcoe_ctlr_vlan_send(struct fcoe_ctlr *fip,
                   enum fip_vlan_subcode sub,
                   const u8 *dest)
 {
     struct sk_buff *skb;
     struct fip_vlan_notify_frame {
         struct ethhdr eth;
         struct fip_header fip;
         struct fip_mac_desc mac;
         struct fip_vlan_desc vlan;
     } __packed * frame;
     size_t len;
     size_t dlen;
 
     len = sizeof(*frame);
     dlen = sizeof(frame->mac) + sizeof(frame->vlan);
     len = max(len, sizeof(struct ethhdr));
 
     skb = dev_alloc_skb(len);
     if (!skb)
         return;
 
     LIBFCOE_FIP_DBG(fip, "fip %s vlan notification, vlan %d\n",
             fip->mode == FIP_MODE_VN2VN ? "vn2vn" : "fcf",
             fip->lp->vlan);
 
     frame = (struct fip_vlan_notify_frame *)skb->data;
     memset(frame, 0, len);
     memcpy(frame->eth.h_dest, dest, ETH_ALEN);
 
     memcpy(frame->eth.h_source, fip->ctl_src_addr, ETH_ALEN);
     frame->eth.h_proto = htons(ETH_P_FIP);
 
     frame->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER);
     frame->fip.fip_op = htons(FIP_OP_VLAN);
     frame->fip.fip_subcode = sub;
     frame->fip.fip_dl_len = htons(dlen / FIP_BPW);
 
     frame->mac.fd_desc.fip_dtype = FIP_DT_MAC;
     frame->mac.fd_desc.fip_dlen = sizeof(frame->mac) / FIP_BPW;
     memcpy(frame->mac.fd_mac, fip->ctl_src_addr, ETH_ALEN);
 
     frame->vlan.fd_desc.fip_dtype = FIP_DT_VLAN;
     frame->vlan.fd_desc.fip_dlen = sizeof(frame->vlan) / FIP_BPW;
     put_unaligned_be16(fip->lp->vlan, &frame->vlan.fd_vlan);
 
     skb_put(skb, len);
     skb->protocol = htons(ETH_P_FIP);
     skb->priority = fip->priority;
     skb_reset_mac_header(skb);
     skb_reset_network_header(skb);
 
     fip->send(fip, skb);
 }
 
 /**
  * fcoe_ctlr_vlan_disc_reply() - send FIP VLAN Discovery Notification.
  * @fip: The FCoE controller
  * @frport: The newly-parsed FCoE rport from the Discovery Request
  *
  * Called with ctlr_mutex held.
  */
 static void fcoe_ctlr_vlan_disc_reply(struct fcoe_ctlr *fip,
                       struct fcoe_rport *frport)
 {
     enum fip_vlan_subcode sub = FIP_SC_VL_NOTE;
 
     if (fip->mode == FIP_MODE_VN2VN)
         sub = FIP_SC_VL_VN2VN_NOTE;
 
     fcoe_ctlr_vlan_send(fip, sub, frport->enode_mac);
 }
 
 /**
  * fcoe_ctlr_vlan_recv - vlan request receive handler for VN2VN mode.
  * @fip: The FCoE controller
  * @skb: The received FIP packet
  */
 static int fcoe_ctlr_vlan_recv(struct fcoe_ctlr *fip, struct sk_buff *skb)
 {
     struct fip_header *fiph;
     enum fip_vlan_subcode sub;
     struct fcoe_rport frport = { };
     int rc;
 
     fiph = (struct fip_header *)skb->data;
     sub = fiph->fip_subcode;
     rc = fcoe_ctlr_vlan_parse(fip, skb, &frport);
     if (rc) {
         LIBFCOE_FIP_DBG(fip, "vlan_recv vlan_parse error %d\n", rc);
         goto drop;
     }
     mutex_lock(&fip->ctlr_mutex);
     if (sub == FIP_SC_VL_REQ)
         fcoe_ctlr_vlan_disc_reply(fip, &frport);
     mutex_unlock(&fip->ctlr_mutex);
 
 drop:
     kfree_skb(skb);
     return rc;
 }
 
 /**
  * fcoe_ctlr_disc_recv - discovery receive handler for VN2VN mode.
  * @lport: The local port
  * @fp: The received frame
  *
  * This should never be called since we don't see RSCNs or other
  * fabric-generated ELSes.
  */
 static void fcoe_ctlr_disc_recv(struct fc_lport *lport, struct fc_frame *fp)
 {
     struct fc_seq_els_data rjt_data;
 
     rjt_data.reason = ELS_RJT_UNSUP;
     rjt_data.explan = ELS_EXPL_NONE;
     fc_seq_els_rsp_send(fp, ELS_LS_RJT, &rjt_data);
     fc_frame_free(fp);
 }
 
 /*
  * fcoe_ctlr_disc_start - start discovery for VN2VN mode.
  *
  * This sets a flag indicating that remote ports should be created
  * and started for the peers we discover.  We use the disc_callback
  * pointer as that flag.  Peers already discovered are created here.
  *
  * The lport lock is held during this call. The callback must be done
  * later, without holding either the lport or discovery locks.
  * The fcoe_ctlr lock may also be held during this call.
  */
 static void fcoe_ctlr_disc_start(void (*callback)(struct fc_lport *,
                           enum fc_disc_event),
                  struct fc_lport *lport)
 {
     struct fc_disc *disc = &lport->disc;
     struct fcoe_ctlr *fip = disc->priv;
 
     mutex_lock(&disc->disc_mutex);
     disc->disc_callback = callback;
     disc->disc_id = (disc->disc_id + 2) | 1;
     disc->pending = 1;
     schedule_work(&fip->timer_work);
     mutex_unlock(&disc->disc_mutex);
 }
 
 /**
  * fcoe_ctlr_vn_disc() - report FIP VN_port discovery results after claim state.
  * @fip: The FCoE controller
  *
  * Starts the FLOGI and PLOGI login process to each discovered rport for which
  * we've received at least one beacon.
  * Performs the discovery complete callback.
  */
 static void fcoe_ctlr_vn_disc(struct fcoe_ctlr *fip)
 {
     struct fc_lport *lport = fip->lp;
     struct fc_disc *disc = &lport->disc;
     struct fc_rport_priv *rdata;
     struct fcoe_rport *frport;
     void (*callback)(struct fc_lport *, enum fc_disc_event);
 
     mutex_lock(&disc->disc_mutex);
     callback = disc->pending ? disc->disc_callback : NULL;
     disc->pending = 0;
     list_for_each_entry_rcu(rdata, &disc->rports, peers) {
         if (!kref_get_unless_zero(&rdata->kref))
             continue;
         frport = fcoe_ctlr_rport(rdata);
         if (frport->time)
             fc_rport_login(rdata);
         kref_put(&rdata->kref, fc_rport_destroy);
     }
     mutex_unlock(&disc->disc_mutex);
     if (callback)
         callback(lport, DISC_EV_SUCCESS);
 }
 
 /**
  * fcoe_ctlr_vn_timeout - timer work function for VN2VN mode.
  * @fip: The FCoE controller
  */
 static void fcoe_ctlr_vn_timeout(struct fcoe_ctlr *fip)
 {
     unsigned long next_time;
     u8 mac[ETH_ALEN];
     u32 new_port_id = 0;
 
     mutex_lock(&fip->ctlr_mutex);
     switch (fip->state) {
     case FIP_ST_VNMP_START:
         fcoe_ctlr_set_state(fip, FIP_ST_VNMP_PROBE1);
         LIBFCOE_FIP_DBG(fip, "vn_timeout: send 1st probe request\n");
         fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REQ, fcoe_all_vn2vn, 0);
         next_time = jiffies + msecs_to_jiffies(FIP_VN_PROBE_WAIT);
         break;
     case FIP_ST_VNMP_PROBE1:
         fcoe_ctlr_set_state(fip, FIP_ST_VNMP_PROBE2);
         LIBFCOE_FIP_DBG(fip, "vn_timeout: send 2nd probe request\n");
         fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REQ, fcoe_all_vn2vn, 0);
         next_time = jiffies + msecs_to_jiffies(FIP_VN_ANN_WAIT);
         break;
     case FIP_ST_VNMP_PROBE2:
         fcoe_ctlr_set_state(fip, FIP_ST_VNMP_CLAIM);
         new_port_id = fip->port_id;
         hton24(mac, FIP_VN_FC_MAP);
         hton24(mac + 3, new_port_id);
         fcoe_ctlr_map_dest(fip);
         fip->update_mac(fip->lp, mac);
         LIBFCOE_FIP_DBG(fip, "vn_timeout: send claim notify\n");
         fcoe_ctlr_vn_send_claim(fip);
         next_time = jiffies + msecs_to_jiffies(FIP_VN_ANN_WAIT);
         break;
     case FIP_ST_VNMP_CLAIM:
         /*
          * This may be invoked either by starting discovery so don't
          * go to the next state unless it's been long enough.
          */
         next_time = fip->sol_time + msecs_to_jiffies(FIP_VN_ANN_WAIT);
         if (time_after_eq(jiffies, next_time)) {
             fcoe_ctlr_set_state(fip, FIP_ST_VNMP_UP);
             LIBFCOE_FIP_DBG(fip, "vn_timeout: send vn2vn beacon\n");
             fcoe_ctlr_vn_send(fip, FIP_SC_VN_BEACON,
                       fcoe_all_vn2vn, 0);
             next_time = jiffies + msecs_to_jiffies(FIP_VN_ANN_WAIT);
             fip->port_ka_time = next_time;
         }
         fcoe_ctlr_vn_disc(fip);
         break;
     case FIP_ST_VNMP_UP:
         next_time = fcoe_ctlr_vn_age(fip);
         if (time_after_eq(jiffies, fip->port_ka_time)) {
             LIBFCOE_FIP_DBG(fip, "vn_timeout: send vn2vn beacon\n");
             fcoe_ctlr_vn_send(fip, FIP_SC_VN_BEACON,
                       fcoe_all_vn2vn, 0);
             fip->port_ka_time = jiffies +
                  msecs_to_jiffies(FIP_VN_BEACON_INT +
                     (prandom_u32() % FIP_VN_BEACON_FUZZ));
         }
         if (time_before(fip->port_ka_time, next_time))
             next_time = fip->port_ka_time;
         break;
     case FIP_ST_LINK_WAIT:
         goto unlock;
     default:
         WARN(1, "unexpected state %d\n", fip->state);
         goto unlock;
     }
     mod_timer(&fip->timer, next_time);
 unlock:
     mutex_unlock(&fip->ctlr_mutex);
 
     /* If port ID is new, notify local port after dropping ctlr_mutex */
     if (new_port_id)
         fc_lport_set_local_id(fip->lp, new_port_id);
 }
 
 /**
  * fcoe_ctlr_mode_set() - Set or reset the ctlr's mode
  * @lport: The local port to be (re)configured
  * @fip:   The FCoE controller whose mode is changing
  * @fip_mode: The new fip mode
  *
  * Note that the we shouldn't be changing the libfc discovery settings
  * (fc_disc_config) while an lport is going through the libfc state
  * machine. The mode can only be changed when a fcoe_ctlr device is
  * disabled, so that should ensure that this routine is only called
  * when nothing is happening.
  */
 static void fcoe_ctlr_mode_set(struct fc_lport *lport, struct fcoe_ctlr *fip,
                    enum fip_mode fip_mode)
 {
     void *priv;
 
     WARN_ON(lport->state != LPORT_ST_RESET &&
         lport->state != LPORT_ST_DISABLED);
 
     if (fip_mode == FIP_MODE_VN2VN) {
         lport->rport_priv_size = sizeof(struct fcoe_rport);
         lport->point_to_multipoint = 1;
         lport->tt.disc_recv_req = fcoe_ctlr_disc_recv;
         lport->tt.disc_start = fcoe_ctlr_disc_start;
         lport->tt.disc_stop = fcoe_ctlr_disc_stop;
         lport->tt.disc_stop_final = fcoe_ctlr_disc_stop_final;
         priv = fip;
     } else {
         lport->rport_priv_size = 0;
         lport->point_to_multipoint = 0;
         lport->tt.disc_recv_req = NULL;
         lport->tt.disc_start = NULL;
         lport->tt.disc_stop = NULL;
         lport->tt.disc_stop_final = NULL;
         priv = lport;
     }
 
     fc_disc_config(lport, priv);
 }
 
 /**
  * fcoe_libfc_config() - Sets up libfc related properties for local port
  * @lport:    The local port to configure libfc for
  * @fip:      The FCoE controller in use by the local port
  * @tt:       The libfc function template
  * @init_fcp: If non-zero, the FCP portion of libfc should be initialized
  *
  * Returns : 0 for success
  */
 int fcoe_libfc_config(struct fc_lport *lport, struct fcoe_ctlr *fip,
               const struct libfc_function_template *tt, int init_fcp)
 {
     /* Set the function pointers set by the LLDD */
     memcpy(&lport->tt, tt, sizeof(*tt));
     if (init_fcp && fc_fcp_init(lport))
         return -ENOMEM;
     fc_exch_init(lport);
     fc_elsct_init(lport);
     fc_lport_init(lport);
     fc_disc_init(lport);
     fcoe_ctlr_mode_set(lport, fip, fip->mode);
     return 0;
 }
 EXPORT_SYMBOL_GPL(fcoe_libfc_config);
 
 void fcoe_fcf_get_selected(struct fcoe_fcf_device *fcf_dev)
 {
     struct fcoe_ctlr_device *ctlr_dev = fcoe_fcf_dev_to_ctlr_dev(fcf_dev);
     struct fcoe_ctlr *fip = fcoe_ctlr_device_priv(ctlr_dev);
     struct fcoe_fcf *fcf;
 
     mutex_lock(&fip->ctlr_mutex);
     mutex_lock(&ctlr_dev->lock);
 
     fcf = fcoe_fcf_device_priv(fcf_dev);
     if (fcf)
         fcf_dev->selected = (fcf == fip->sel_fcf) ? 1 : 0;
     else
         fcf_dev->selected = 0;
 
     mutex_unlock(&ctlr_dev->lock);
     mutex_unlock(&fip->ctlr_mutex);
 }
 EXPORT_SYMBOL(fcoe_fcf_get_selected);
 
 void fcoe_ctlr_set_fip_mode(struct fcoe_ctlr_device *ctlr_dev)
 {
     struct fcoe_ctlr *ctlr = fcoe_ctlr_device_priv(ctlr_dev);
     struct fc_lport *lport = ctlr->lp;
 
     mutex_lock(&ctlr->ctlr_mutex);
     switch (ctlr_dev->mode) {
     case FIP_CONN_TYPE_VN2VN:
         ctlr->mode = FIP_MODE_VN2VN;
         break;
     case FIP_CONN_TYPE_FABRIC:
     default:
         ctlr->mode = FIP_MODE_FABRIC;
         break;
     }
 
     mutex_unlock(&ctlr->ctlr_mutex);
 
     fcoe_ctlr_mode_set(lport, ctlr, ctlr->mode);
 }
 EXPORT_SYMBOL(fcoe_ctlr_set_fip_mode);