On Fri, 11 Sep 2020 16:28:26 -0500, Brian King wrote:

When a canister on a FS9100, or similar storage, running in NPIV mode,
is rebooted, its WWPNs will fail over to another canister. When this
occurs, we see a WWPN going away from the fabric at one N-Port ID,
and, a short time later, the same WWPN appears at a different N-Port ID.
When the canister is fully operational again, the WWPNs fail back to
the original canister. If there is any I/O outstanding to the target
when this occurs, it will result in the implicit logout the ibmvfc driver
issues before removing the rport to fail. When the WWPN then shows up at a
different N-Port ID, and we issue a PLOGI to it, the VIOS will
see that it still has a login for this WWPN at the old N-Port ID,
which results in the VIOS simulating a link down / link up sequence
to the client, in order to get the VIOS and client LPAR in sync.

[...]

Applied to 5.10/scsi-queue, thanks!

[1/1] scsi: ibmvfc: Avoid link down on FS9100 canister reboot
      https://git.kernel.org/mkp/scsi/c/4b29cb6197d9

-- 
Martin K. Petersen	Oracle Linux Engineering