[PATCH] ibmvfc: Avoid link down on FS9100 canister reboot

[Martin K. Petersen]

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