[PATCH 33/54] libfcoe: FIP should report link to libfc whether selected or not

[Robert Love <robert.w.love@intel.com>]

From: Joe Eykholt <jeykholt@cisco.com>

The fnic driver with FIP is reporting link up, even though it's down.

When the interface is shut down by the switch, we receive a clear
virtual link, and set the state reported to libfc as down, although
we still report it up.  Clearly wrong.  That causes the subsequent
link down event not to be reported, and /sys shows the host "Online".

Currently, in FIP mode, if an FCF times out, then link to libfc
is reported as down, to stop FLOGIs.  That interferes with the LLD
link down being reported.

Users really need to know the physical link information, to diagnose
cabling issues, so physical link status should be reported to libfc.

If the selected FCF needs to be reported, that should be done
separately, in a later patch.

Signed-off-by: Joe Eykholt <jeykholt@cisco.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
---

 drivers/scsi/fcoe/libfcoe.c |   60 ++++++++++++++++++++++---------------------
 include/scsi/libfcoe.h      |    1 +
 2 files changed, 31 insertions(+), 30 deletions(-)

diff --git a/drivers/scsi/fcoe/libfcoe.c b/drivers/scsi/fcoe/libfcoe.c
index 787e722..4d857c2 100644
--- a/drivers/scsi/fcoe/libfcoe.c
+++ b/drivers/scsi/fcoe/libfcoe.c
@@ -277,38 +277,16 @@ EXPORT_SYMBOL(fcoe_ctlr_link_up);
 /**
  * fcoe_ctlr_reset() - Reset a FCoE controller
  * @fip:       The FCoE controller to reset
- * @new_state: The FIP state to be entered
- *
- * Returns non-zero if the link was up and now isn't.
  */
-static int fcoe_ctlr_reset(struct fcoe_ctlr *fip, enum fip_state new_state)
+static void fcoe_ctlr_reset(struct fcoe_ctlr *fip)
 {
-	struct fc_lport *lport = fip->lp;
-	int link_dropped;
-
-	spin_lock_bh(&fip->lock);
 	fcoe_ctlr_reset_fcfs(fip);
 	del_timer(&fip->timer);
-	fip->state = new_state;
 	fip->ctlr_ka_time = 0;
 	fip->port_ka_time = 0;
 	fip->sol_time = 0;
 	fip->flogi_oxid = FC_XID_UNKNOWN;
 	fip->map_dest = 0;
-	fip->last_link = 0;
-	link_dropped = fip->link;
-	fip->link = 0;
-	spin_unlock_bh(&fip->lock);
-
-	if (link_dropped)
-		fc_linkdown(lport);
-
-	if (new_state == FIP_ST_ENABLED) {
-		fcoe_ctlr_solicit(fip, NULL);
-		fc_linkup(lport);
-		link_dropped = 0;
-	}
-	return link_dropped;
 }
 
 /**
@@ -322,7 +300,20 @@ static int fcoe_ctlr_reset(struct fcoe_ctlr *fip, enum fip_state new_state)
  */
 int fcoe_ctlr_link_down(struct fcoe_ctlr *fip)
 {
-	return fcoe_ctlr_reset(fip, FIP_ST_LINK_WAIT);
+	int link_dropped;
+
+	LIBFCOE_FIP_DBG(fip, "link down.\n");
+	spin_lock_bh(&fip->lock);
+	fcoe_ctlr_reset(fip);
+	link_dropped = fip->link;
+	fip->link = 0;
+	fip->last_link = 0;
+	fip->state = FIP_ST_LINK_WAIT;
+	spin_unlock_bh(&fip->lock);
+
+	if (link_dropped)
+		fc_linkdown(fip->lp);
+	return link_dropped;
 }
 EXPORT_SYMBOL(fcoe_ctlr_link_down);
 
@@ -994,7 +985,13 @@ static void fcoe_ctlr_recv_clr_vlink(struct fcoe_ctlr *fip,
 				desc_mask);
 	} else {
 		LIBFCOE_FIP_DBG(fip, "performing Clear Virtual Link\n");
-		fcoe_ctlr_reset(fip, FIP_ST_ENABLED);
+
+		spin_lock_bh(&fip->lock);
+		fcoe_ctlr_reset(fip);
+		spin_unlock_bh(&fip->lock);
+
+		fc_lport_reset(fip->lp);
+		fcoe_ctlr_solicit(fip, NULL);
 	}
 }
 
@@ -1152,15 +1149,14 @@ static void fcoe_ctlr_timeout(unsigned long arg)
 			fip->port_ka_time = jiffies +
 				msecs_to_jiffies(FIP_VN_KA_PERIOD);
 			fip->ctlr_ka_time = jiffies + sel->fka_period;
-			fip->link = 1;
 		} else {
 			printk(KERN_NOTICE "libfcoe: host%d: "
 			       "FIP Fibre-Channel Forwarder timed out.	"
 			       "Starting FCF discovery.\n",
 			       fip->lp->host->host_no);
-			fip->link = 0;
+			fip->reset_req = 1;
+			schedule_work(&fip->link_work);
 		}
-		schedule_work(&fip->link_work);
 	}
 
 	if (sel) {
@@ -1205,20 +1201,24 @@ static void fcoe_ctlr_link_work(struct work_struct *work)
 	u8 *mac;
 	int link;
 	int last_link;
+	int reset;
 
 	fip = container_of(work, struct fcoe_ctlr, link_work);
 	spin_lock_bh(&fip->lock);
 	last_link = fip->last_link;
 	link = fip->link;
 	fip->last_link = link;
+	reset = fip->reset_req;
+	fip->reset_req = 0;
 	spin_unlock_bh(&fip->lock);
 
 	if (last_link != link) {
 		if (link)
 			fc_linkup(fip->lp);
 		else
-			fcoe_ctlr_reset(fip, FIP_ST_LINK_WAIT);
-	}
+			fc_linkdown(fip->lp);
+	} else if (reset && link)
+		fc_lport_reset(fip->lp);
 
 	if (fip->send_ctlr_ka) {
 		fip->send_ctlr_ka = 0;
diff --git a/include/scsi/libfcoe.h b/include/scsi/libfcoe.h
index 2344a00..e38ffa0 100644
--- a/include/scsi/libfcoe.h
+++ b/include/scsi/libfcoe.h
@@ -108,6 +108,7 @@ struct fcoe_ctlr {
 	u8 flogi_count;
 	u8 link;
 	u8 last_link;
+	u8 reset_req;
 	u8 map_dest;
 	u8 spma;
 	u8 send_ctlr_ka;