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.kenn...@emulex.com>
Signed-off-by: James Smart <james.sm...@emulex.com>
---
drivers/scsi/lpfc/lpfc_crtn.h | 1 +
drivers/scsi/lpfc/lpfc_init.c | 11 ++++++++---
drivers/scsi/lpfc/lpfc_scsi.c | 25 +++++++++++++++++++++++++
3 files changed, 34 insertions(+), 3 deletions(-)
diff --git a/drivers/scsi/lpfc/lpfc_crtn.h b/drivers/scsi/lpfc/lpfc_crtn.h
index 00665a5..665c88c 100644
--- a/drivers/scsi/lpfc/lpfc_crtn.h
+++ b/drivers/scsi/lpfc/lpfc_crtn.h
@@ -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;
diff --git a/drivers/scsi/lpfc/lpfc_init.c b/drivers/scsi/lpfc/lpfc_init.c
index 4ba91af..74672e0 100644
--- a/drivers/scsi/lpfc/lpfc_init.c
+++ b/drivers/scsi/lpfc/lpfc_init.c
@@ -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;
diff --git a/drivers/scsi/lpfc/lpfc_scsi.c b/drivers/scsi/lpfc/lpfc_scsi.c
index 4f9222e..f623299 100644
--- a/drivers/scsi/lpfc/lpfc_scsi.c
+++ b/drivers/scsi/lpfc/lpfc_scsi.c
@@ -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,
--
1.7.11.7
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