Adding upstream version 5.10.209.upstream/5.10.209upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 3266 insertions, 0 deletions

diff --git a/drivers/scsi/fcoe/fcoe_ctlr.c b/drivers/scsi/fcoe/fcoe_ctlr.c
new file mode 100644
index 000000000..a2d60ad2a
--- /dev/null
+++ b/drivers/scsi/fcoe/fcoe_ctlr.c
@@ -0,0 +1,3266 @@
+// 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;
+	unsigned long flags;
+
+	mutex_lock(&fip->ctlr_mutex);
+	spin_lock_irqsave(&fip->ctlr_lock, flags);
+
+	kfree_skb(fip->flogi_req);
+	fip->flogi_req = NULL;
+	list_for_each_entry(fcf, &fip->fcfs, list)
+		fcf->flogi_sent = 0;
+
+	spin_unlock_irqrestore(&fip->ctlr_lock, flags);
+	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;
+	unsigned long flags;
+	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_irqsave(&fip->ctlr_lock, flags);
+		kfree_skb(fip->flogi_req);
+		fip->flogi_req = skb;
+		fip->flogi_req_send = 1;
+		spin_unlock_irqrestore(&fip->ctlr_lock, flags);
+		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;
+	struct fc_stats *stats;
+
+	INIT_LIST_HEAD(&del_list);
+
+	stats = per_cpu_ptr(fip->lp->stats, get_cpu());
+
+	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)) {
+				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,
+				       stats->MissDiscAdvCount);
+			} 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);
+			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;
+		}
+	}
+	put_cpu();
+
+	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;
+	struct fc_stats *stats;
+	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;
+
+	stats = per_cpu_ptr(lport->stats, get_cpu());
+	stats->RxFrames++;
+	stats->RxWords += skb->len / FIP_BPW;
+	put_cpu();
+
+	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_els() - 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);
+				per_cpu_ptr(lport->stats,
+					    get_cpu())->VLinkFailureCount++;
+				put_cpu();
+				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);
+		per_cpu_ptr(lport->stats, get_cpu())->VLinkFailureCount++;
+		put_cpu();
+		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;
+	unsigned long flags;
+	int error;
+
+	mutex_lock(&fip->ctlr_mutex);
+	spin_lock_irqsave(&fip->ctlr_lock, flags);
+	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_irqrestore(&fip->ctlr_lock, flags);
+	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;
+	unsigned long flags;
+
+	spin_lock_irqsave(&fip->ctlr_lock, flags);
+	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_irqrestore(&fip->ctlr_lock, flags);
+}
+
+/**
+ * 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_disk_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);