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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. The patch below improves the way we handle this scenario so as to avoid the link bounce, which affects all targets under the virtual host adapter. The change is to utilize the Move Login MAD, which will work even when I/O is outstanding to the target. The change only alters the target state machine for the case where the implicit logout fails prior to deleting the rport. If this implicit logout fails, we defer deleting the ibmvfc_target object after calling fc_remote_port_delete. This enables us to later retry the implicit logout after terminate_rport_io occurs, or to issue the Move Login request if a WWPN shows up at a new N-Port ID prior to this occurring. This has been tested by IBM's storage interoperability team on a FS9100, forcing the failover to occur. With debug tracing enabled in the ibmvfc driver, we confirmed the move login was sent in this scenario and confirmed the link bounce no longer occurred. [mkp: fix checkpatch warnings] Link: https://lore.kernel.org/r/1599859706-8505-1-git-send-email-brking@linux.vnet.ibm.com Signed-off-by: Brian King <brking@linux.vnet.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> |
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| .. | ||
| ibmvfc.c | ||
| ibmvfc.h | ||
| ibmvscsi.c | ||
| ibmvscsi.h | ||
| Makefile | ||