linux-kernel - [PATCH 5.4 140/214] scsi: qla2xxx: Fix login timeout

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Date:   Tue,  1 Sep 2020 17:10:20 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Himanshu Madhani <himanshu.madhani@...cle.com>,
        Quinn Tran <qutran@...vell.com>,
        Nilesh Javali <njavali@...vell.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 140/214] scsi: qla2xxx: Fix login timeout

From: Quinn Tran <qutran@...vell.com>

[ Upstream commit abb31aeaa9b20680b0620b23fea5475ea4591e31 ]

Multipath errors were seen during failback due to login timeout.  The
remote device sent LOGO, the local host tore down the session and did
relogin. The RSCN arrived indicates remote device is going through failover
after which the relogin is in a 20s timeout phase.  At this point the
driver is stuck in the relogin process.  Add a fix to delete the session as
part of abort/flush the login.

Link: https://lore.kernel.org/r/20200806111014.28434-5-njavali@marvell.com
Reviewed-by: Himanshu Madhani <himanshu.madhani@...cle.com>
Signed-off-by: Quinn Tran <qutran@...vell.com>
Signed-off-by: Nilesh Javali <njavali@...vell.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/scsi/qla2xxx/qla_gs.c     | 18 +++++++++++++++---
 drivers/scsi/qla2xxx/qla_target.c |  2 +-
 2 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/drivers/scsi/qla2xxx/qla_gs.c b/drivers/scsi/qla2xxx/qla_gs.c
index a44de4c5dcf6c..fc6e12fb7d77b 100644
--- a/drivers/scsi/qla2xxx/qla_gs.c
+++ b/drivers/scsi/qla2xxx/qla_gs.c
@@ -3673,10 +3673,22 @@ void qla24xx_async_gnnft_done(scsi_qla_host_t *vha, srb_t *sp)
 		}
 
 		if (fcport->scan_state != QLA_FCPORT_FOUND) {
+			bool do_delete = false;
+
+			if (fcport->scan_needed &&
+			    fcport->disc_state == DSC_LOGIN_PEND) {
+				/* Cable got disconnected after we sent
+				 * a login. Do delete to prevent timeout.
+				 */
+				fcport->logout_on_delete = 1;
+				do_delete = true;
+			}
+
 			fcport->scan_needed = 0;
-			if ((qla_dual_mode_enabled(vha) ||
-				qla_ini_mode_enabled(vha)) &&
-			    atomic_read(&fcport->state) == FCS_ONLINE) {
+			if (((qla_dual_mode_enabled(vha) ||
+			      qla_ini_mode_enabled(vha)) &&
+			    atomic_read(&fcport->state) == FCS_ONLINE) ||
+				do_delete) {
 				if (fcport->loop_id != FC_NO_LOOP_ID) {
 					if (fcport->flags & FCF_FCP2_DEVICE)
 						fcport->logout_on_delete = 0;
diff --git a/drivers/scsi/qla2xxx/qla_target.c b/drivers/scsi/qla2xxx/qla_target.c
index cb8a892e2d393..b75e6e4d58c06 100644
--- a/drivers/scsi/qla2xxx/qla_target.c
+++ b/drivers/scsi/qla2xxx/qla_target.c
@@ -1262,7 +1262,7 @@ void qlt_schedule_sess_for_deletion(struct fc_port *sess)
 
 	qla24xx_chk_fcp_state(sess);
 
-	ql_dbg(ql_dbg_tgt, sess->vha, 0xe001,
+	ql_dbg(ql_dbg_disc, sess->vha, 0xe001,
 	    "Scheduling sess %p for deletion %8phC\n",
 	    sess, sess->port_name);
 
-- 
2.25.1