linux-kernel - [PATCH AUTOSEL for 4.15 68/78] scsi: lpfc: Fix issues connecting with nvme initiator

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Date:   Thu, 8 Mar 2018 04:56:31 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
CC:     James Smart <jsmart2021@...il.com>,
        Dick Kennedy <dick.kennedy@...adcom.com>,
        James Smart <james.smart@...adcom.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL for 4.15 68/78] scsi: lpfc: Fix issues connecting with
 nvme initiator

From: James Smart <jsmart2021@...il.com>

[ Upstream commit e06351a002214d152142906a546006e3446d1ef7 ]

In the lpfc discovery engine, when as a nvme target, where the driver
was performing mailbox io with the adapter for port login when a NVME
PRLI is received from the host. Rather than queue and eventually get
back to sending a response after the mailbox traffic, the driver
rejected the io with an error response.

Turns out this particular initiator didn't like the rejection values
(unable to process command/command in progress) so it never attempted a
retry of the PRLI. Thus the host never established nvme connectivity
with the lpfc target.

By changing the rejection values (to Logical Busy/nothing more), the
initiator accepted the response and would retry the PRLI, resulting in
nvme connectivity.

Signed-off-by: Dick Kennedy <dick.kennedy@...adcom.com>
Signed-off-by: James Smart <james.smart@...adcom.com>
Reviewed-by: Hannes Reinecke <hare@...e.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 drivers/scsi/lpfc/lpfc_nportdisc.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/lpfc/lpfc_nportdisc.c b/drivers/scsi/lpfc/lpfc_nportdisc.c
index 678bfdd53eb2..d489f6827cc1 100644
--- a/drivers/scsi/lpfc/lpfc_nportdisc.c
+++ b/drivers/scsi/lpfc/lpfc_nportdisc.c
@@ -1569,8 +1569,8 @@ lpfc_rcv_prli_reglogin_issue(struct lpfc_vport *vport,
 					 ndlp->nlp_rpi, ndlp->nlp_state,
 					 ndlp->nlp_flag);
 			memset(&stat, 0, sizeof(struct ls_rjt));
-			stat.un.b.lsRjtRsnCode = LSRJT_UNABLE_TPC;
-			stat.un.b.lsRjtRsnCodeExp = LSEXP_CMD_IN_PROGRESS;
+			stat.un.b.lsRjtRsnCode = LSRJT_LOGICAL_BSY;
+			stat.un.b.lsRjtRsnCodeExp = LSEXP_NOTHING_MORE;
 			lpfc_els_rsp_reject(vport, stat.un.lsRjtError, cmdiocb,
 					    ndlp, NULL);
 			return ndlp->nlp_state;
-- 
2.14.1