[PATCH 4.15 66/84] scsi: lpfc: Fix issues connecting with nvme initiator

[Greg Kroah-Hartman]

4.15-stable review patch.  If anyone has any objections, please let me know.

------------------

From: James Smart <jsmart2021@xxxxxxxxx>


[ 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@xxxxxxxxxxxx>
Signed-off-by: James Smart <james.smart@xxxxxxxxxxxx>
Reviewed-by: Hannes Reinecke <hare@xxxxxxxx>
Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/scsi/lpfc/lpfc_nportdisc.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- 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
 					 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;