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lpfc: Fix host reset escalation killing all IOs. 

Fix host reset escalation killing all IOs.

SLI-3 adapters will use a new host template. The template differs
from SLI-4 adapters in that it does not have an eh_host_reset_handler.

Lpfc has traditionally never had a host_reset. The host reset
handler was added when we ran into a stuck hardware condition on a
SLI-4 adapter. The host_reset will reset and reinit the pci function,
clearing the hardware condition.

Unfortunately, the host reset handler uses attach/detach code paths,
which makes scsi_add_host() and scsi_remove_host() calls. Meaning, a
host_reset will completely remove the scsi_host from the system. As a
new call to scsi_add_host() is made, the shost# changes, which results
in completely new scsi_devices and device names. All the older scsi
devices on the old shost# are now orphaned and unrecoverable.

We realize we need to re-implement the host_reset_handler so the scsi_host
stays registered across the host_reset, but that will be a rather
lengthy effort. In the short term, we had an immediate need to restore
the SLI-3 devices to their working behavior, with the easiest path being
to remove their host_reset handler.

Signed-off-by: Dick Kennedy <dick.kennedy@emulex.com>
Signed-off-by: James Smart <james.smart@emulex.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: James Bottomley <JBottomley@Odin.com>
This commit is contained in:
James Smart 2015-04-07 15:07:13 -04:00 committed by James Bottomley
parent 85c0f17720
commit ea4142f6b1
3 changed files with 34 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/scsi/lpfc/lpfc_crtn.h
View File

@ -354,6 +354,7 @@ void lpfc_free_sysfs_attr(struct lpfc_vport *);
extern struct device_attribute *lpfc_hba_attrs[];
extern struct device_attribute *lpfc_vport_attrs[];
extern struct scsi_host_template lpfc_template;
extern struct scsi_host_template lpfc_template_s3;
extern struct scsi_host_template lpfc_vport_template;
extern struct fc_function_template lpfc_transport_functions;
extern struct fc_function_template lpfc_vport_transport_functions;

11
drivers/scsi/lpfc/lpfc_init.c
View File

@ -3257,12 +3257,17 @@ lpfc_create_port(struct lpfc_hba *phba, int instance, struct device *dev)
struct Scsi_Host *shost;
int error = 0;
if (dev != &phba->pcidev->dev)
if (dev != &phba->pcidev->dev) {
shost = scsi_host_alloc(&lpfc_vport_template,
sizeof(struct lpfc_vport));
else
shost = scsi_host_alloc(&lpfc_template,
} else {
if (phba->sli_rev == LPFC_SLI_REV4)
shost = scsi_host_alloc(&lpfc_template,
sizeof(struct lpfc_vport));
else
shost = scsi_host_alloc(&lpfc_template_s3,
sizeof(struct lpfc_vport));
}
if (!shost)
goto out;

25
drivers/scsi/lpfc/lpfc_scsi.c
View File

@ -5857,6 +5857,31 @@ lpfc_disable_oas_lun(struct lpfc_hba *phba, struct lpfc_name *vport_wwpn,
return false;
}
struct scsi_host_template lpfc_template_s3 = {
.module = THIS_MODULE,
.name = LPFC_DRIVER_NAME,
.info = lpfc_info,
.queuecommand = lpfc_queuecommand,
.eh_abort_handler = lpfc_abort_handler,
.eh_device_reset_handler = lpfc_device_reset_handler,
.eh_target_reset_handler = lpfc_target_reset_handler,
.eh_bus_reset_handler = lpfc_bus_reset_handler,
.slave_alloc = lpfc_slave_alloc,
.slave_configure = lpfc_slave_configure,
.slave_destroy = lpfc_slave_destroy,
.scan_finished = lpfc_scan_finished,
.this_id = -1,
.sg_tablesize = LPFC_DEFAULT_SG_SEG_CNT,
.cmd_per_lun = LPFC_CMD_PER_LUN,
.use_clustering = ENABLE_CLUSTERING,
.shost_attrs = lpfc_hba_attrs,
.max_sectors = 0xFFFF,
.vendor_id = LPFC_NL_VENDOR_ID,
.change_queue_depth = scsi_change_queue_depth,
.use_blk_tags = 1,
.track_queue_depth = 1,
};
struct scsi_host_template lpfc_template = {
.module = THIS_MODULE,
.name = LPFC_DRIVER_NAME,