From: Arun Easi <aeasi@marvell.com>
Date: Fri, 26 Jul 2019 09:07:36 -0700
Subject: scsi: qla2xxx: Fix NVMe port discovery after a short device port loss
Patch-mainline: v5.4-rc1
Git-commit: 9e744591ef1b8df27c25c68dac858dada8688f77
References: bsc#1082635 bsc#1141340 bsc#1143706
The following sequence of event leads to NVME port disappearing:
- device port shut
- nvme_fc_unregister_remoteport
- device port online
- remote port delete completes
- relogin is scheduled
- "post gidpn" message appears due to rscn generation # mismatch
In short, if a device comes back online sooner than an unregister
completion, a mismatch in rscn generation number occurs, which is not
handled correctly during device relogin. Fix this by starting with a redo
of GNL.
When ql2xextended_error_logging is enabled, the re-plugged device's
discovery stops with the following messages printed:
--8<--
qla2xxx [0000:41:00.0]-480d:3: Relogin scheduled.
qla2xxx [0000:41:00.0]-4800:3: DPC handler sleeping.
qla2xxx [0000:41:00.0]-2902:3: qla24xx_handle_relogin_event 21:00:00:24:ff:17:9e:91 DS 0 LS 7 P 0 del 2 cnfl
(null) rscn 1|2 login 1|2 fl 1
qla2xxx [0000:41:00.0]-28e9:3: qla24xx_handle_relogin_event 1666 21:00:00:24:ff:17:9e:91 post gidpn
qla2xxx [0000:41:00.0]-480e:3: Relogin end.
--8<--
Signed-off-by: Arun Easi <aeasi@marvell.com>
Signed-off-by: Himanshu Madhani <hmadhani@marvell.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Acked-by: Daniel Wagner <dwagner@suse.de>
---
drivers/scsi/qla2xxx/qla_init.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/scsi/qla2xxx/qla_init.c
+++ b/drivers/scsi/qla2xxx/qla_init.c
@@ -1665,9 +1665,9 @@ void qla24xx_handle_relogin_event(scsi_q
}
if (fcport->last_rscn_gen != fcport->rscn_gen) {
- ql_dbg(ql_dbg_disc, vha, 0x20e9, "%s %d %8phC post gidpn\n",
+ ql_dbg(ql_dbg_disc, vha, 0x20e9, "%s %d %8phC post gnl\n",
__func__, __LINE__, fcport->port_name);
-
+ qla24xx_post_gnl_work(vha, fcport);
return;
}