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| author |   Brian King <brking@linux.vnet.ibm.com> | 2022-10-26 13:13:56 -0500 |
|---|---|---|
| committer |   Martin K. Petersen <martin.petersen@oracle.com> | 2022-11-07 18:57:39 +0000 |
| commit | 62fa3ce05d5d73c5eccc40b2db493f55fecfc446 (patch) | |
| tree | 4c0a3e295d43736e259c19ebd7f6b34f60bab1dc | |
| parent | scsi: ufs: core: Fix typo in comment (diff) | |
| download | linux-dev-62fa3ce05d5d73c5eccc40b2db493f55fecfc446.tar.xz linux-dev-62fa3ce05d5d73c5eccc40b2db493f55fecfc446.zip | |
scsi: ibmvfc: Avoid path failures during live migration
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 <brking@linux.vnet.ibm.com>
Link: https://lore.kernel.org/r/20221026181356.148517-1-brking@linux.vnet.ibm.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
| -rw-r--r-- | drivers/scsi/ibmvscsi/ibmvfc.c | 14 |
1 files 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); |