From: Brian King <brk...@linux.vnet.ibm.com> [ Upstream commit 62fa3ce05d5d73c5eccc40b2db493f55fecfc446 ]
Fix an issue reported when performing a live migration when multipath is configured with a short fast fail timeout of 5 seconds and also to have no_path_retry set to fail. In this scenario, all paths would go into the devloss state while the ibmvfc driver went through discovery to log back in. On a loaded system, the discovery might take longer than 5 seconds, which was resulting in all paths being marked failed, which then resulted in a read only filesystem. This patch changes the migration code in ibmvfc to avoid deleting rports at all in this scenario, so we avoid losing all paths. Signed-off-by: Brian King <brk...@linux.vnet.ibm.com> Link: https://lore.kernel.org/r/20221026181356.148517-1-brk...@linux.vnet.ibm.com Signed-off-by: Martin K. Petersen <martin.peter...@oracle.com> Signed-off-by: Sasha Levin <sas...@kernel.org> --- drivers/scsi/ibmvscsi/ibmvfc.c | 14 +++++++++++--- 1 file changed, 11 insertions(+), 3 deletions(-) diff --git a/drivers/scsi/ibmvscsi/ibmvfc.c b/drivers/scsi/ibmvscsi/ibmvfc.c index 00684e11976b..1a0c0b7289d2 100644 --- a/drivers/scsi/ibmvscsi/ibmvfc.c +++ b/drivers/scsi/ibmvscsi/ibmvfc.c @@ -708,8 +708,13 @@ static void ibmvfc_init_host(struct ibmvfc_host *vhost) memset(vhost->async_crq.msgs.async, 0, PAGE_SIZE); vhost->async_crq.cur = 0; - list_for_each_entry(tgt, &vhost->targets, queue) - ibmvfc_del_tgt(tgt); + list_for_each_entry(tgt, &vhost->targets, queue) { + if (vhost->client_migrated) + tgt->need_login = 1; + else + ibmvfc_del_tgt(tgt); + } + scsi_block_requests(vhost->host); ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT); vhost->job_step = ibmvfc_npiv_login; @@ -3235,9 +3240,12 @@ static void ibmvfc_handle_crq(struct ibmvfc_crq *crq, struct ibmvfc_host *vhost, /* We need to re-setup the interpartition connection */ dev_info(vhost->dev, "Partition migrated, Re-enabling adapter\n"); vhost->client_migrated = 1; + + scsi_block_requests(vhost->host); ibmvfc_purge_requests(vhost, DID_REQUEUE); - ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN); + ibmvfc_set_host_state(vhost, IBMVFC_LINK_DOWN); ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_REENABLE); + wake_up(&vhost->work_wait_q); } else if (crq->format == IBMVFC_PARTNER_FAILED || crq->format == IBMVFC_PARTNER_DEREGISTER) { dev_err(vhost->dev, "Host partner adapter deregistered or failed (rc=%d)\n", crq->format); ibmvfc_purge_requests(vhost, DID_ERROR); -- 2.35.1
