linux-kernel - [PATCH 5.19 0589/1157] scsi: qla2xxx: edif: Fix n2n login retry for secure device

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Date:   Mon, 15 Aug 2022 19:59:05 +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, Quinn Tran <qutran@...vell.com>,
        Nilesh Javali <njavali@...vell.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.19 0589/1157] scsi: qla2xxx: edif: Fix n2n login retry for secure device

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

[ Upstream commit aec55325ddec975216119da000092cb8664a3399 ]

After initiator has burned up all login retries, target authentication
application begins to run. This triggers a link bounce on target side.
Initiator will attempt another login. Due to N2N, the PRLI [nvme | fcp] can
fail because of the mode mismatch with target. This patch add a few more
login retries to revive the connection.

Link: https://lore.kernel.org/r/20220607044627.19563-11-njavali@marvell.com
Fixes: 4de067e5df12 ("scsi: qla2xxx: edif: Add N2N support for EDIF")
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_init.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/scsi/qla2xxx/qla_init.c b/drivers/scsi/qla2xxx/qla_init.c
index 5f077f9217e5..177ce45b76a6 100644
--- a/drivers/scsi/qla2xxx/qla_init.c
+++ b/drivers/scsi/qla2xxx/qla_init.c
@@ -2123,6 +2123,13 @@ qla24xx_handle_prli_done_event(struct scsi_qla_host *vha, struct event_arg *ea)
 		}
 
 		if (N2N_TOPO(vha->hw)) {
+			if (ea->fcport->n2n_link_reset_cnt ==
+			    vha->hw->login_retry_count &&
+			    ea->fcport->flags & FCF_FCSP_DEVICE) {
+				/* remote authentication app just started */
+				ea->fcport->n2n_link_reset_cnt = 0;
+			}
+
 			if (ea->fcport->n2n_link_reset_cnt <
 			    vha->hw->login_retry_count) {
 				ea->fcport->n2n_link_reset_cnt++;
-- 
2.35.1