[SCSI] fnic: FIP VLAN Discovery Feature Support

FIP VLAN discovery discovers the FCoE VLAN that will be used by all other FIP
protocols as well as by the FCoE encapsulation for Fibre Channel payloads on
the established virtual link. One of the goals of FC-BB-5 was to be as
nonintrusive as possible on initiators and targets, and therefore FIP VLAN
discovery occurs in the native VLAN used by the initiator or target to
exchange Ethernet traffic. The FIP VLAN discovery protocol is the only FIP
protocol running on the native VLAN; all other FIP protocols run on the
discovered FCoE VLANs.

If an administrator has manually configured FCoE VLANs on ENodes and FCFs,
there is no need to use this protocol. FIP and FCoE will run over the
configured VLANs.

An ENode without FCoE VLANs configuration would use this automated discovery
protocol to discover over which VLANs FCoE is running.

The ENode sends a FIP VLAN discovery request to a multicast MAC address called
All-FCF-MACs, which is a multicast MAC address to which all FCFs listen.

All FCFs that can be reached in the native VLAN of the ENode are expected to
respond on the same VLAN with a response that lists one or more FCoE VLANs
that are available for the ENode's VN_Port login. This protocol has the sole
purpose of allowing the ENode to discover all the available FCoE VLANs.

Now the ENode may enable a subset of these VLANs for FCoE Running the FIP
protocol in these VLANs on a per VLAN basis. And FCoE data transactions also
would occur on this VLAN. Hence, Except for FIP VLAN discovery, all other FIP
and FCoE traffic runs on the selected FCoE VLAN. Its only the FIP VLAN
Discovery protocol that is permitted to run on the Default native VLAN of the
system.

[**** NOTE ****]
We are working on moving this feature definitions and functionality to libfcoe
module. We need this patch to be approved, as Suse is looking forward to merge
this feature in SLES 11 SP3 release. Once this patch is approved, we will
submit patch which should move vlan discovery feature to libfoce.

[Fengguang Wu <[e-mail]>: kmalloc cast removal]
Signed-off-by: Anantha Prakash T <[e-mail]>
Signed-off-by: Hiral Patel <[e-mail]>
Signed-off-by: James Bottomley <[e-mail]>

drivers/scsi/fnic/fnic.h

···
 
 struct mempool;
 
+enum fnic_evt {
+	FNIC_EVT_START_VLAN_DISC = 1,
+	FNIC_EVT_START_FCF_DISC = 2,
+	FNIC_EVT_MAX,
+};
+
+struct fnic_event {
+	struct list_head list;
+	struct fnic *fnic;
+	enum fnic_evt event;
+};
+
 /* Per-instance private data structure */
 struct fnic {
 	struct fc_lport *lport;
···
 	struct sk_buff_head frame_queue;
 	struct sk_buff_head tx_queue;
 
+	/*** FIP related data members  -- start ***/
+	void (*set_vlan)(struct fnic *, u16 vlan);
+	struct work_struct      fip_frame_work;
+	struct sk_buff_head     fip_frame_queue;
+	struct timer_list       fip_timer;
+	struct list_head        vlans;
+	spinlock_t              vlans_lock;
+
+	struct work_struct      event_work;
+	struct list_head        evlist;
+	/*** FIP related data members  -- end ***/
+
 	/* copy work queue cache line section */
 	____cacheline_aligned struct vnic_wq_copy wq_copy[FNIC_WQ_COPY_MAX];
 	/* completion queue cache line section */
···
 }
 
 extern struct workqueue_struct *fnic_event_queue;
+extern struct workqueue_struct *fnic_fip_queue;
 extern struct device_attribute *fnic_attrs[];
 
 void fnic_clear_intr_mode(struct fnic *fnic);
···
 void fnic_free_wq_buf(struct vnic_wq *wq, struct vnic_wq_buf *buf);
 void fnic_handle_frame(struct work_struct *work);
 void fnic_handle_link(struct work_struct *work);
+void fnic_handle_event(struct work_struct *work);
 int fnic_rq_cmpl_handler(struct fnic *fnic, int);
 int fnic_alloc_rq_frame(struct vnic_rq *rq);
 void fnic_free_rq_buf(struct vnic_rq *rq, struct vnic_rq_buf *buf);
···
 void fnic_handle_link_event(struct fnic *fnic);
 
 int fnic_is_abts_pending(struct fnic *, struct scsi_cmnd *);
+
+void fnic_handle_fip_frame(struct work_struct *work);
+void fnic_handle_fip_event(struct fnic *fnic);
+void fnic_fcoe_reset_vlans(struct fnic *fnic);
+void fnic_fcoe_evlist_free(struct fnic *fnic);
+extern void fnic_handle_fip_timer(struct fnic *fnic);
 
 static inline int
 fnic_chk_state_flags_locked(struct fnic *fnic, unsigned long st_flags)

drivers/scsi/fnic/fnic_fcs.c

···
 #include <scsi/libfc.h>
 #include "fnic_io.h"
 #include "fnic.h"
+#include "fnic_fip.h"
 #include "cq_enet_desc.h"
 #include "cq_exch_desc.h"
 
+static u8 fcoe_all_fcfs[ETH_ALEN];
+struct workqueue_struct *fnic_fip_queue;
 struct workqueue_struct *fnic_event_queue;
 
 static void fnic_set_eth_mode(struct fnic *);
+static void fnic_fcoe_send_vlan_req(struct fnic *fnic);
+static void fnic_fcoe_start_fcf_disc(struct fnic *fnic);
+static void fnic_fcoe_process_vlan_resp(struct fnic *fnic, struct sk_buff *);
+static int fnic_fcoe_vlan_check(struct fnic *fnic, u16 flag);
+static int fnic_fcoe_handle_fip_frame(struct fnic *fnic, struct sk_buff *skb);
 
 void fnic_handle_link(struct work_struct *work)
 {
···
 				FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host,
 					     "link down\n");
 				fcoe_ctlr_link_down(&fnic->ctlr);
+				if (fnic->config.flags & VFCF_FIP_CAPABLE) {
+					/* start FCoE VLAN discovery */
+					fnic_fcoe_send_vlan_req(fnic);
+					return;
+				}
 				FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host,
 					     "link up\n");
 				fcoe_ctlr_link_up(&fnic->ctlr);
···
 	} else if (fnic->link_status) {
 		/* DOWN -> UP */
 		spin_unlock_irqrestore(&fnic->fnic_lock, flags);
+		if (fnic->config.flags & VFCF_FIP_CAPABLE) {
+			/* start FCoE VLAN discovery */
+			fnic_fcoe_send_vlan_req(fnic);
+			return;
+		}
 		FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host, "link up\n");
 		fcoe_ctlr_link_up(&fnic->ctlr);
 	} else {
···
 	}
 }
 
+void fnic_fcoe_evlist_free(struct fnic *fnic)
+{
+	struct fnic_event *fevt = NULL;
+	struct fnic_event *next = NULL;
+	unsigned long flags;
+
+	spin_lock_irqsave(&fnic->fnic_lock, flags);
+	if (list_empty(&fnic->evlist)) {
+		spin_unlock_irqrestore(&fnic->fnic_lock, flags);
+		return;
+	}
+
+	list_for_each_entry_safe(fevt, next, &fnic->evlist, list) {
+		list_del(&fevt->list);
+		kfree(fevt);
+	}
+	spin_unlock_irqrestore(&fnic->fnic_lock, flags);
+}
+
+void fnic_handle_event(struct work_struct *work)
+{
+	struct fnic *fnic = container_of(work, struct fnic, event_work);
+	struct fnic_event *fevt = NULL;
+	struct fnic_event *next = NULL;
+	unsigned long flags;
+
+	spin_lock_irqsave(&fnic->fnic_lock, flags);
+	if (list_empty(&fnic->evlist)) {
+		spin_unlock_irqrestore(&fnic->fnic_lock, flags);
+		return;
+	}
+
+	list_for_each_entry_safe(fevt, next, &fnic->evlist, list) {
+		if (fnic->stop_rx_link_events) {
+			list_del(&fevt->list);
+			kfree(fevt);
+			spin_unlock_irqrestore(&fnic->fnic_lock, flags);
+			return;
+		}
+		/*
+		 * If we're in a transitional state, just re-queue and return.
+		 * The queue will be serviced when we get to a stable state.
+		 */
+		if (fnic->state != FNIC_IN_FC_MODE &&
+		    fnic->state != FNIC_IN_ETH_MODE) {
+			spin_unlock_irqrestore(&fnic->fnic_lock, flags);
+			return;
+		}
+
+		list_del(&fevt->list);
+		switch (fevt->event) {
+		case FNIC_EVT_START_VLAN_DISC:
+			spin_unlock_irqrestore(&fnic->fnic_lock, flags);
+			fnic_fcoe_send_vlan_req(fnic);
+			spin_lock_irqsave(&fnic->fnic_lock, flags);
+			break;
+		case FNIC_EVT_START_FCF_DISC:
+			FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host,
+				  "Start FCF Discovery\n");
+			fnic_fcoe_start_fcf_disc(fnic);
+			break;
+		default:
+			FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host,
+				  "Unknown event 0x%x\n", fevt->event);
+			break;
+		}
+		kfree(fevt);
+	}
+	spin_unlock_irqrestore(&fnic->fnic_lock, flags);
+}
+
+/**
+ * Check if the Received FIP FLOGI frame is rejected
+ * @fip: The FCoE controller that received the frame
+ * @skb: The received FIP frame
+ *
+ * Returns non-zero if the frame is rejected with unsupported cmd with
+ * insufficient resource els explanation.
+ */
+static inline int is_fnic_fip_flogi_reject(struct fcoe_ctlr *fip,
+					 struct sk_buff *skb)
+{
+	struct fc_lport *lport = fip->lp;
+	struct fip_header *fiph;
+	struct fc_frame_header *fh = NULL;
+	struct fip_desc *desc;
+	struct fip_encaps *els;
+	enum fip_desc_type els_dtype = 0;
+	u16 op;
+	u8 els_op;
+	u8 sub;
+
+	size_t els_len = 0;
+	size_t rlen;
+	size_t dlen = 0;
+
+	if (skb_linearize(skb))
+		return 0;
+
+	if (skb->len < sizeof(*fiph))
+		return 0;
+
+	fiph = (struct fip_header *)skb->data;
+	op = ntohs(fiph->fip_op);
+	sub = fiph->fip_subcode;
+
+	if (op != FIP_OP_LS)
+		return 0;
+
+	if (sub != FIP_SC_REP)
+		return 0;
+
+	rlen = ntohs(fiph->fip_dl_len) * 4;
+	if (rlen + sizeof(*fiph) > skb->len)
+		return 0;
+
+	desc = (struct fip_desc *)(fiph + 1);
+	dlen = desc->fip_dlen * FIP_BPW;
+
+	if (desc->fip_dtype == FIP_DT_FLOGI) {
+
+		shost_printk(KERN_DEBUG, lport->host,
+			  " FIP TYPE FLOGI: fab name:%llx "
+			  "vfid:%d map:%x\n",
+			  fip->sel_fcf->fabric_name, fip->sel_fcf->vfid,
+			  fip->sel_fcf->fc_map);
+		if (dlen < sizeof(*els) + sizeof(*fh) + 1)
+			return 0;
+
+		els_len = dlen - sizeof(*els);
+		els = (struct fip_encaps *)desc;
+		fh = (struct fc_frame_header *)(els + 1);
+		els_dtype = desc->fip_dtype;
+
+		if (!fh)
+			return 0;
+
+		/*
+		 * ELS command code, reason and explanation should be = Reject,
+		 * unsupported command and insufficient resource
+		 */
+		els_op = *(u8 *)(fh + 1);
+		if (els_op == ELS_LS_RJT) {
+			shost_printk(KERN_INFO, lport->host,
+				  "Flogi Request Rejected by Switch\n");
+			return 1;
+		}
+		shost_printk(KERN_INFO, lport->host,
+				"Flogi Request Accepted by Switch\n");
+	}
+	return 0;
+}
+
+static void fnic_fcoe_send_vlan_req(struct fnic *fnic)
+{
+	struct fcoe_ctlr *fip = &fnic->ctlr;
+	struct sk_buff *skb;
+	char *eth_fr;
+	int fr_len;
+	struct fip_vlan *vlan;
+	u64 vlan_tov;
+
+	fnic_fcoe_reset_vlans(fnic);
+	fnic->set_vlan(fnic, 0);
+	FNIC_FCS_DBG(KERN_INFO, fnic->lport->host,
+		  "Sending VLAN request...\n");
+	skb = dev_alloc_skb(sizeof(struct fip_vlan));
+	if (!skb)
+		return;
+
+	fr_len = sizeof(*vlan);
+	eth_fr = (char *)skb->data;
+	vlan = (struct fip_vlan *)eth_fr;
+
+	memset(vlan, 0, sizeof(*vlan));
+	memcpy(vlan->eth.h_source, fip->ctl_src_addr, ETH_ALEN);
+	memcpy(vlan->eth.h_dest, fcoe_all_fcfs, ETH_ALEN);
+	vlan->eth.h_proto = htons(ETH_P_FIP);
+
+	vlan->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER);
+	vlan->fip.fip_op = htons(FIP_OP_VLAN);
+	vlan->fip.fip_subcode = FIP_SC_VL_REQ;
+	vlan->fip.fip_dl_len = htons(sizeof(vlan->desc) / FIP_BPW);
+
+	vlan->desc.mac.fd_desc.fip_dtype = FIP_DT_MAC;
+	vlan->desc.mac.fd_desc.fip_dlen = sizeof(vlan->desc.mac) / FIP_BPW;
+	memcpy(&vlan->desc.mac.fd_mac, fip->ctl_src_addr, ETH_ALEN);
+
+	vlan->desc.wwnn.fd_desc.fip_dtype = FIP_DT_NAME;
+	vlan->desc.wwnn.fd_desc.fip_dlen = sizeof(vlan->desc.wwnn) / FIP_BPW;
+	put_unaligned_be64(fip->lp->wwnn, &vlan->desc.wwnn.fd_wwn);
+
+	skb_put(skb, sizeof(*vlan));
+	skb->protocol = htons(ETH_P_FIP);
+	skb_reset_mac_header(skb);
+	skb_reset_network_header(skb);
+	fip->send(fip, skb);
+
+	/* set a timer so that we can retry if there no response */
+	vlan_tov = jiffies + msecs_to_jiffies(FCOE_CTLR_FIPVLAN_TOV);
+	mod_timer(&fnic->fip_timer, round_jiffies(vlan_tov));
+}
+
+static void fnic_fcoe_process_vlan_resp(struct fnic *fnic, struct sk_buff *skb)
+{
+	struct fcoe_ctlr *fip = &fnic->ctlr;
+	struct fip_header *fiph;
+	struct fip_desc *desc;
+	u16 vid;
+	size_t rlen;
+	size_t dlen;
+	struct fcoe_vlan *vlan;
+	u64 sol_time;
+	unsigned long flags;
+
+	FNIC_FCS_DBG(KERN_INFO, fnic->lport->host,
+		  "Received VLAN response...\n");
+
+	fiph = (struct fip_header *) skb->data;
+
+	FNIC_FCS_DBG(KERN_INFO, fnic->lport->host,
+		  "Received VLAN response... OP 0x%x SUB_OP 0x%x\n",
+		  ntohs(fiph->fip_op), fiph->fip_subcode);
+
+	rlen = ntohs(fiph->fip_dl_len) * 4;
+	fnic_fcoe_reset_vlans(fnic);
+	spin_lock_irqsave(&fnic->vlans_lock, flags);
+	desc = (struct fip_desc *)(fiph + 1);
+	while (rlen > 0) {
+		dlen = desc->fip_dlen * FIP_BPW;
+		switch (desc->fip_dtype) {
+		case FIP_DT_VLAN:
+			vid = ntohs(((struct fip_vlan_desc *)desc)->fd_vlan);
+			shost_printk(KERN_INFO, fnic->lport->host,
+				  "process_vlan_resp: FIP VLAN %d\n", vid);
+			vlan = kmalloc(sizeof(*vlan),
+							GFP_ATOMIC);
+			if (!vlan) {
+				/* retry from timer */
+				spin_unlock_irqrestore(&fnic->vlans_lock,
+							flags);
+				goto out;
+			}
+			memset(vlan, 0, sizeof(struct fcoe_vlan));
+			vlan->vid = vid & 0x0fff;
+			vlan->state = FIP_VLAN_AVAIL;
+			list_add_tail(&vlan->list, &fnic->vlans);
+			break;
+		}
+		desc = (struct fip_desc *)((char *)desc + dlen);
+		rlen -= dlen;
+	}
+
+	/* any VLAN descriptors present ? */
+	if (list_empty(&fnic->vlans)) {
+		/* retry from timer */
+		FNIC_FCS_DBG(KERN_INFO, fnic->lport->host,
+			  "No VLAN descriptors in FIP VLAN response\n");
+		spin_unlock_irqrestore(&fnic->vlans_lock, flags);
+		goto out;
+	}
+
+	vlan = list_first_entry(&fnic->vlans, struct fcoe_vlan, list);
+	fnic->set_vlan(fnic, vlan->vid);
+	vlan->state = FIP_VLAN_SENT; /* sent now */
+	vlan->sol_count++;
+	spin_unlock_irqrestore(&fnic->vlans_lock, flags);
+
+	/* start the solicitation */
+	fcoe_ctlr_link_up(fip);
+
+	sol_time = jiffies + msecs_to_jiffies(FCOE_CTLR_START_DELAY);
+	mod_timer(&fnic->fip_timer, round_jiffies(sol_time));
+out:
+	return;
+}
+
+static void fnic_fcoe_start_fcf_disc(struct fnic *fnic)
+{
+	unsigned long flags;
+	struct fcoe_vlan *vlan;
+	u64 sol_time;
+
+	spin_lock_irqsave(&fnic->vlans_lock, flags);
+	vlan = list_first_entry(&fnic->vlans, struct fcoe_vlan, list);
+	fnic->set_vlan(fnic, vlan->vid);
+	vlan->state = FIP_VLAN_SENT; /* sent now */
+	vlan->sol_count = 1;
+	spin_unlock_irqrestore(&fnic->vlans_lock, flags);
+
+	/* start the solicitation */
+	fcoe_ctlr_link_up(&fnic->ctlr);
+
+	sol_time = jiffies + msecs_to_jiffies(FCOE_CTLR_START_DELAY);
+	mod_timer(&fnic->fip_timer, round_jiffies(sol_time));
+}
+
+static int fnic_fcoe_vlan_check(struct fnic *fnic, u16 flag)
+{
+	unsigned long flags;
+	struct fcoe_vlan *fvlan;
+
+	spin_lock_irqsave(&fnic->vlans_lock, flags);
+	if (list_empty(&fnic->vlans)) {
+		spin_unlock_irqrestore(&fnic->vlans_lock, flags);
+		return -EINVAL;
+	}
+
+	fvlan = list_first_entry(&fnic->vlans, struct fcoe_vlan, list);
+	if (fvlan->state == FIP_VLAN_USED) {
+		spin_unlock_irqrestore(&fnic->vlans_lock, flags);
+		return 0;
+	}
+
+	if (fvlan->state == FIP_VLAN_SENT) {
+		fvlan->state = FIP_VLAN_USED;
+		spin_unlock_irqrestore(&fnic->vlans_lock, flags);
+		return 0;
+	}
+	spin_unlock_irqrestore(&fnic->vlans_lock, flags);
+	return -EINVAL;
+}
+
+static void fnic_event_enq(struct fnic *fnic, enum fnic_evt ev)
+{
+	struct fnic_event *fevt;
+	unsigned long flags;
+
+	fevt = kmalloc(sizeof(*fevt), GFP_ATOMIC);
+	if (!fevt)
+		return;
+
+	fevt->fnic = fnic;
+	fevt->event = ev;
+
+	spin_lock_irqsave(&fnic->fnic_lock, flags);
+	list_add_tail(&fevt->list, &fnic->evlist);
+	spin_unlock_irqrestore(&fnic->fnic_lock, flags);
+
+	schedule_work(&fnic->event_work);
+}
+
+static int fnic_fcoe_handle_fip_frame(struct fnic *fnic, struct sk_buff *skb)
+{
+	struct fip_header *fiph;
+	int ret = 1;
+	u16 op;
+	u8 sub;
+
+	if (!skb || !(skb->data))
+		return -1;
+
+	if (skb_linearize(skb))
+		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;
+
+	if (op == FIP_OP_DISC && sub == FIP_SC_ADV) {
+		if (fnic_fcoe_vlan_check(fnic, ntohs(fiph->fip_flags)))
+			goto drop;
+		/* pass it on to fcoe */
+		ret = 1;
+	} else if (op == FIP_OP_VLAN && sub == FIP_SC_VL_REP) {
+		/* set the vlan as used */
+		fnic_fcoe_process_vlan_resp(fnic, skb);
+		ret = 0;
+	} else if (op == FIP_OP_CTRL && sub == FIP_SC_CLR_VLINK) {
+		/* received CVL request, restart vlan disc */
+		fnic_event_enq(fnic, FNIC_EVT_START_VLAN_DISC);
+		/* pass it on to fcoe */
+		ret = 1;
+	}
+drop:
+	return ret;
+}
+
+void fnic_handle_fip_frame(struct work_struct *work)
+{
+	struct fnic *fnic = container_of(work, struct fnic, fip_frame_work);
+	unsigned long flags;
+	struct sk_buff *skb;
+	struct ethhdr *eh;
+
+	while ((skb = skb_dequeue(&fnic->fip_frame_queue))) {
+		spin_lock_irqsave(&fnic->fnic_lock, flags);
+		if (fnic->stop_rx_link_events) {
+			spin_unlock_irqrestore(&fnic->fnic_lock, flags);
+			dev_kfree_skb(skb);
+			return;
+		}
+		/*
+		 * If we're in a transitional state, just re-queue and return.
+		 * The queue will be serviced when we get to a stable state.
+		 */
+		if (fnic->state != FNIC_IN_FC_MODE &&
+		    fnic->state != FNIC_IN_ETH_MODE) {
+			skb_queue_head(&fnic->fip_frame_queue, skb);
+			spin_unlock_irqrestore(&fnic->fnic_lock, flags);
+			return;
+		}
+		spin_unlock_irqrestore(&fnic->fnic_lock, flags);
+		eh = (struct ethhdr *)skb->data;
+		if (eh->h_proto == htons(ETH_P_FIP)) {
+			skb_pull(skb, sizeof(*eh));
+			if (fnic_fcoe_handle_fip_frame(fnic, skb) <= 0) {
+				dev_kfree_skb(skb);
+				continue;
+			}
+			/*
+			 * If there's FLOGI rejects - clear all
+			 * fcf's & restart from scratch
+			 */
+			if (is_fnic_fip_flogi_reject(&fnic->ctlr, skb)) {
+				shost_printk(KERN_INFO, fnic->lport->host,
+					  "Trigger a Link down - VLAN Disc\n");
+				fcoe_ctlr_link_down(&fnic->ctlr);
+				/* start FCoE VLAN discovery */
+				fnic_fcoe_send_vlan_req(fnic);
+				dev_kfree_skb(skb);
+				continue;
+			}
+			fcoe_ctlr_recv(&fnic->ctlr, skb);
+			continue;
+		}
+	}
+}
+
 /**
  * fnic_import_rq_eth_pkt() - handle received FCoE or FIP frame.
  * @fnic:	fnic instance.
···
 		skb_reset_mac_header(skb);
 	}
 	if (eh->h_proto == htons(ETH_P_FIP)) {
-		skb_pull(skb, sizeof(*eh));
-		fcoe_ctlr_recv(&fnic->ctlr, skb);
+		skb_queue_tail(&fnic->fip_frame_queue, skb);
+		queue_work(fnic_fip_queue, &fnic->fip_frame_work);
 		return 1;		/* let caller know packet was used */
 	}
 	if (eh->h_proto != htons(ETH_P_FCOE))
···
 
 	dev_kfree_skb(fp_skb(fp));
 	buf->os_buf = NULL;
+}
+
+void fnic_fcoe_reset_vlans(struct fnic *fnic)
+{
+	unsigned long flags;
+	struct fcoe_vlan *vlan;
+	struct fcoe_vlan *next;
+
+	/*
+	 * indicate a link down to fcoe so that all fcf's are free'd
+	 * might not be required since we did this before sending vlan
+	 * discovery request
+	 */
+	spin_lock_irqsave(&fnic->vlans_lock, flags);
+	if (!list_empty(&fnic->vlans)) {
+		list_for_each_entry_safe(vlan, next, &fnic->vlans, list) {
+			list_del(&vlan->list);
+			kfree(vlan);
+		}
+	}
+	spin_unlock_irqrestore(&fnic->vlans_lock, flags);
+}
+
+void fnic_handle_fip_timer(struct fnic *fnic)
+{
+	unsigned long flags;
+	struct fcoe_vlan *vlan;
+	u64 sol_time;
+
+	spin_lock_irqsave(&fnic->fnic_lock, flags);
+	if (fnic->stop_rx_link_events) {
+		spin_unlock_irqrestore(&fnic->fnic_lock, flags);
+		return;
+	}
+	spin_unlock_irqrestore(&fnic->fnic_lock, flags);
+
+	if (fnic->ctlr.mode == FIP_ST_NON_FIP)
+		return;
+
+	spin_lock_irqsave(&fnic->vlans_lock, flags);
+	if (list_empty(&fnic->vlans)) {
+		/* no vlans available, try again */
+		FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host,
+			  "Start VLAN Discovery\n");
+		spin_unlock_irqrestore(&fnic->vlans_lock, flags);
+		fnic_event_enq(fnic, FNIC_EVT_START_VLAN_DISC);
+		return;
+	}
+
+	vlan = list_first_entry(&fnic->vlans, struct fcoe_vlan, list);
+	shost_printk(KERN_DEBUG, fnic->lport->host,
+		  "fip_timer: vlan %d state %d sol_count %d\n",
+		  vlan->vid, vlan->state, vlan->sol_count);
+	switch (vlan->state) {
+	case FIP_VLAN_USED:
+		FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host,
+			  "FIP VLAN is selected for FC transaction\n");
+		spin_unlock_irqrestore(&fnic->vlans_lock, flags);
+		break;
+	case FIP_VLAN_FAILED:
+		/* if all vlans are in failed state, restart vlan disc */
+		FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host,
+			  "Start VLAN Discovery\n");
+		spin_unlock_irqrestore(&fnic->vlans_lock, flags);
+		fnic_event_enq(fnic, FNIC_EVT_START_VLAN_DISC);
+		break;
+	case FIP_VLAN_SENT:
+		if (vlan->sol_count >= FCOE_CTLR_MAX_SOL) {
+			/*
+			 * no response on this vlan, remove  from the list.
+			 * Try the next vlan
+			 */
+			shost_printk(KERN_INFO, fnic->lport->host,
+				  "Dequeue this VLAN ID %d from list\n",
+				  vlan->vid);
+			list_del(&vlan->list);
+			kfree(vlan);
+			vlan = NULL;
+			if (list_empty(&fnic->vlans)) {
+				/* we exhausted all vlans, restart vlan disc */
+				spin_unlock_irqrestore(&fnic->vlans_lock,
+							flags);
+				shost_printk(KERN_INFO, fnic->lport->host,
+					  "fip_timer: vlan list empty, "
+					  "trigger vlan disc\n");
+				fnic_event_enq(fnic, FNIC_EVT_START_VLAN_DISC);
+				return;
+			}
+			/* check the next vlan */
+			vlan = list_first_entry(&fnic->vlans, struct fcoe_vlan,
+							list);
+			fnic->set_vlan(fnic, vlan->vid);
+			vlan->state = FIP_VLAN_SENT; /* sent now */
+		}
+		spin_unlock_irqrestore(&fnic->vlans_lock, flags);
+		vlan->sol_count++;
+		sol_time = jiffies + msecs_to_jiffies
+					(FCOE_CTLR_START_DELAY);
+		mod_timer(&fnic->fip_timer, round_jiffies(sol_time));
+		break;
+	}
 }

drivers/scsi/fnic/fnic_fip.h

···
+/*
+ * Copyright 2008 Cisco Systems, Inc.  All rights reserved.
+ * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
+ *
+ * This program is free software; you may redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#ifndef _FNIC_FIP_H_
+#define _FNIC_FIP_H_
+
+
+#define FCOE_CTLR_START_DELAY    2000    /* ms after first adv. to choose FCF */
+#define FCOE_CTLR_FIPVLAN_TOV    2000    /* ms after FIP VLAN disc */
+#define FCOE_CTLR_MAX_SOL        8
+
+#define FINC_MAX_FLOGI_REJECTS   8
+
+/*
+ * FIP_DT_VLAN descriptor.
+ */
+struct fip_vlan_desc {
+	struct fip_desc fd_desc;
+	__be16 fd_vlan;
+} __attribute__((packed));
+
+struct vlan {
+	__be16 vid;
+	__be16 type;
+};
+
+/*
+ * VLAN entry.
+ */
+struct fcoe_vlan {
+	struct list_head list;
+	u16 vid;		/* vlan ID */
+	u16 sol_count;		/* no. of sols sent */
+	u16 state;		/* state */
+};
+
+enum fip_vlan_state {
+	FIP_VLAN_AVAIL  = 0,	/* don't do anything */
+	FIP_VLAN_SENT   = 1,	/* sent */
+	FIP_VLAN_USED   = 2,	/* succeed */
+	FIP_VLAN_FAILED = 3,	/* failed to response */
+};
+
+struct fip_vlan {
+	struct ethhdr eth;
+	struct fip_header fip;
+	struct {
+		struct fip_mac_desc mac;
+		struct fip_wwn_desc wwnn;
+	} desc;
+};
+
+#endif  /* __FINC_FIP_H_ */

drivers/scsi/fnic/fnic_main.c

···
 #include "vnic_intr.h"
 #include "vnic_stats.h"
 #include "fnic_io.h"
+#include "fnic_fip.h"
 #include "fnic.h"
 
 #define PCI_DEVICE_ID_CISCO_FNIC	0x0045
···
 		  round_jiffies(jiffies + FNIC_NOTIFY_TIMER_PERIOD));
 }
 
+static void fnic_fip_notify_timer(unsigned long data)
+{
+	struct fnic *fnic = (struct fnic *)data;
+
+	fnic_handle_fip_timer(fnic);
+}
+
 static void fnic_notify_timer_start(struct fnic *fnic)
 {
 	switch (vnic_dev_get_intr_mode(fnic->vdev)) {
···
 	struct fnic *fnic = lport_priv(lport);
 
 	return fnic->data_src_addr;
+}
+
+static void fnic_set_vlan(struct fnic *fnic, u16 vlan_id)
+{
+	u16 old_vlan;
+	old_vlan = vnic_dev_set_default_vlan(fnic->vdev, vlan_id);
 }
 
 static int fnic_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
···
 		vnic_dev_packet_filter(fnic->vdev, 1, 1, 0, 0, 0);
 		vnic_dev_add_addr(fnic->vdev, FIP_ALL_ENODE_MACS);
 		vnic_dev_add_addr(fnic->vdev, fnic->ctlr.ctl_src_addr);
+		fnic->set_vlan = fnic_set_vlan;
 		fcoe_ctlr_init(&fnic->ctlr, FIP_MODE_AUTO);
+		setup_timer(&fnic->fip_timer, fnic_fip_notify_timer,
+							(unsigned long)fnic);
+		spin_lock_init(&fnic->vlans_lock);
+		INIT_WORK(&fnic->fip_frame_work, fnic_handle_fip_frame);
+		INIT_WORK(&fnic->event_work, fnic_handle_event);
+		skb_queue_head_init(&fnic->fip_frame_queue);
+		spin_lock_irqsave(&fnic_list_lock, flags);
+		if (!fnic_fip_queue) {
+			fnic_fip_queue =
+				create_singlethread_workqueue("fnic_fip_q");
+			if (!fnic_fip_queue) {
+				spin_unlock_irqrestore(&fnic_list_lock, flags);
+				printk(KERN_ERR PFX "fnic FIP work queue "
+						 "create failed\n");
+				err = -ENOMEM;
+				goto err_out_free_max_pool;
+			}
+		}
+		spin_unlock_irqrestore(&fnic_list_lock, flags);
+		INIT_LIST_HEAD(&fnic->evlist);
+		INIT_LIST_HEAD(&fnic->vlans);
 	} else {
 		shost_printk(KERN_INFO, fnic->lport->host,
 			     "firmware uses non-FIP mode\n");
···
 	skb_queue_purge(&fnic->frame_queue);
 	skb_queue_purge(&fnic->tx_queue);
 
+	if (fnic->config.flags & VFCF_FIP_CAPABLE) {
+		del_timer_sync(&fnic->fip_timer);
+		skb_queue_purge(&fnic->fip_frame_queue);
+		fnic_fcoe_reset_vlans(fnic);
+		fnic_fcoe_evlist_free(fnic);
+	}
+
 	/*
 	 * Log off the fabric. This stops all remote ports, dns port,
 	 * logs off the fabric. This flushes all rport, disc, lport work
···
 	len = sizeof(struct fnic_sgl_list);
 	fnic_sgl_cache[FNIC_SGL_CACHE_MAX] = kmem_cache_create
 		("fnic_sgl_max", len + FNIC_SG_DESC_ALIGN, FNIC_SG_DESC_ALIGN,
-		 SLAB_HWCACHE_ALIGN,
-		 NULL);
+		  SLAB_HWCACHE_ALIGN,
+		  NULL);
 	if (!fnic_sgl_cache[FNIC_SGL_CACHE_MAX]) {
 		printk(KERN_ERR PFX "failed to create fnic max sgl slab\n");
 		err = -ENOMEM;
···
 {
 	pci_unregister_driver(&fnic_driver);
 	destroy_workqueue(fnic_event_queue);
+	if (fnic_fip_queue) {
+		flush_workqueue(fnic_fip_queue);
+		destroy_workqueue(fnic_fip_queue);
+	}
 	kmem_cache_destroy(fnic_sgl_cache[FNIC_SGL_CACHE_MAX]);
 	kmem_cache_destroy(fnic_sgl_cache[FNIC_SGL_CACHE_DFLT]);
 	kmem_cache_destroy(fnic_io_req_cache);

drivers/scsi/fnic/vnic_dev.c

···
 	return vnic_dev_cmd(vdev, CMD_INIT, &a0, &a1, wait);
 }
 
+u16 vnic_dev_set_default_vlan(struct vnic_dev *vdev, u16 new_default_vlan)
+{
+	u64 a0 = new_default_vlan, a1 = 0;
+	int wait = 1000;
+	int old_vlan = 0;
+
+	old_vlan = vnic_dev_cmd(vdev, CMD_SET_DEFAULT_VLAN, &a0, &a1, wait);
+	return (u16)old_vlan;
+}
+
 int vnic_dev_link_status(struct vnic_dev *vdev)
 {
 	if (vdev->linkstatus)

drivers/scsi/fnic/vnic_dev.h

···
 int vnic_dev_open(struct vnic_dev *vdev, int arg);
 int vnic_dev_open_done(struct vnic_dev *vdev, int *done);
 int vnic_dev_init(struct vnic_dev *vdev, int arg);
+u16 vnic_dev_set_default_vlan(struct vnic_dev *vdev,
+				u16 new_default_vlan);
 int vnic_dev_soft_reset(struct vnic_dev *vdev, int arg);
 int vnic_dev_soft_reset_done(struct vnic_dev *vdev, int *done);
 void vnic_dev_set_intr_mode(struct vnic_dev *vdev,

drivers/scsi/fnic/vnic_devcmd.h

···
 
 	/* undo initialize of virtual link */
 	CMD_DEINIT		= _CMDCNW(_CMD_DIR_NONE, _CMD_VTYPE_ALL, 34),
+
+	/* check fw capability of a cmd:
+	 * in:  (u32)a0=cmd
+	 * out: (u32)a0=errno, 0:valid cmd, a1=supported VNIC_STF_* bits */
+	CMD_CAPABILITY      = _CMDC(_CMD_DIR_RW, _CMD_VTYPE_ALL, 36),
+
+	/* persistent binding info
+	 * in:  (u64)a0=paddr of arg
+	 *      (u32)a1=CMD_PERBI_XXX */
+	CMD_PERBI       = _CMDC(_CMD_DIR_RW, _CMD_VTYPE_FC, 37),
+
+	/* Interrupt Assert Register functionality
+	 * in: (u16)a0=interrupt number to assert
+	 */
+	CMD_IAR         = _CMDCNW(_CMD_DIR_WRITE, _CMD_VTYPE_ALL, 38),
+
+	/* initiate hangreset, like softreset after hang detected */
+	CMD_HANG_RESET      = _CMDC(_CMD_DIR_NONE, _CMD_VTYPE_ALL, 39),
+
+	/* hangreset status:
+	 *    out: a0=0 reset complete, a0=1 reset in progress */
+	CMD_HANG_RESET_STATUS   = _CMDC(_CMD_DIR_READ, _CMD_VTYPE_ALL, 40),
+
+	/*
+	 * Set hw ingress packet vlan rewrite mode:
+	 * in:  (u32)a0=new vlan rewrite mode
+	 * out: (u32)a0=old vlan rewrite mode */
+	CMD_IG_VLAN_REWRITE_MODE = _CMDC(_CMD_DIR_RW, _CMD_VTYPE_ENET, 41),
+
+	/*
+	 * in:  (u16)a0=bdf of target vnic
+	 *      (u32)a1=cmd to proxy
+	 *      a2-a15=args to cmd in a1
+	 * out: (u32)a0=status of proxied cmd
+	 *      a1-a15=out args of proxied cmd */
+	CMD_PROXY_BY_BDF =  _CMDC(_CMD_DIR_RW, _CMD_VTYPE_ALL, 42),
+
+	/*
+	 * As for BY_BDF except a0 is index of hvnlink subordinate vnic
+	 * or SR-IOV virtual vnic
+	 */
+	CMD_PROXY_BY_INDEX =    _CMDC(_CMD_DIR_RW, _CMD_VTYPE_ALL, 43),
+
+	/*
+	 * For HPP toggle:
+	 * adapter-info-get
+	 * in:  (u64)a0=phsical address of buffer passed in from caller.
+	 *      (u16)a1=size of buffer specified in a0.
+	 * out: (u64)a0=phsical address of buffer passed in from caller.
+	 *      (u16)a1=actual bytes from VIF-CONFIG-INFO TLV, or
+	 *              0 if no VIF-CONFIG-INFO TLV was ever received. */
+	CMD_CONFIG_INFO_GET = _CMDC(_CMD_DIR_RW, _CMD_VTYPE_ALL, 44),
+
+	/*
+	 * INT13 API: (u64)a0=paddr to vnic_int13_params struct
+	 *            (u32)a1=INT13_CMD_xxx
+	 */
+	CMD_INT13_ALL = _CMDC(_CMD_DIR_WRITE, _CMD_VTYPE_ALL, 45),
+
+	/*
+	 * Set default vlan:
+	 * in: (u16)a0=new default vlan
+	 *     (u16)a1=zero for overriding vlan with param a0,
+	 *             non-zero for resetting vlan to the default
+	 * out: (u16)a0=old default vlan
+	 */
+	CMD_SET_DEFAULT_VLAN = _CMDC(_CMD_DIR_RW, _CMD_VTYPE_ALL, 46)
 };
 
 /* flags for CMD_OPEN */