scsi: qla2xxx: Fix NVMe port discovery after a short device port loss

BugLink: https://bugs.launchpad.net/bugs/1856869

[ Upstream commit 9e74459 ]

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 <[email protected]>
Signed-off-by: Himanshu Madhani <[email protected]>
Signed-off-by: Martin K. Petersen <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>
Signed-off-by: Connor Kuehl <[email protected]>
Signed-off-by: Kleber Sacilotto de Souza <[email protected]>

drivers/scsi/qla2xxx/qla_init.c

@@ -1712,9 +1712,9 @@ void qla24xx_handle_relogin_event(scsi_qla_host_t *vha,
 	}
 
 	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;
 	}