When we get an unsolicited notification on local link went down,
zfcp_fsf_status_read_link_down() calls zfcp_fsf_link_down_info_eval().
This only blocks rports, and sets ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED and
ZFCP_STATUS_COMMON_ERP_FAILED. Only the fc_host port_state changes to
"Linkdown", because zfcp_scsi_get_host_port_state() is an active callback
and uses the adapter status.
Other fc_host attributes model, port_id, port_type, speed, fabric_name
(and zfcp device attributes card_version, peer_wwpn, peer_wwnn, peer_d_id)
which depend on a local link, continued to show their last known
"good" value.
Only if something triggered an exchange config data, some values were
updated to their unknown equivalent via case
FSF_EXCHANGE_CONFIG_DATA_INCOMPLETE due to local link down.
Triggers for exchange config data are adapter recovery, or
reading any of the following zfcp-specific scsi host sysfs attributes
"requests", "megabytes", or "seconds_active" in
/sys/devices/css*/*.*.*/*.*.*/host*/scsi_host/host*/.
The other fc_host attributes active_fc4s and permanent_port_name
continued to show their last known "good" value.
Only if something triggered an exchange port data, some values changed.
Active_fc4s became all zeros as unknown equivalent during link down.
Permanent_port_name does not depend on a local link. But for
non-NPIV FCP devices, permanent_port_name erroneously became whatever
value fc_host port_name had at that point in time (see previous paragraph).
Triggers for exchange port data are the zfcp-specific scsi host sysfs
attribute "utilization", or [{reset,get}_fc_host_stats]
write anything into "reset_statistics" or read any of the other attributes
under /sys/devices/css*/*.*.*/*.*.*/host*/fc_host/host*/statistics/.
(cf. v4.9 commit bd77befa5bcf ("zfcp: fix fc_host port_type with NPIV"))
This is particularly confusing when using "lszfcp -b <fcpdevbusid> -Ha"
or dbginfo.sh which read fc_host attributes and also scsi_host attributes.
After link down, the first invocation produces (abbreviated):
Class = "fc_host"
active_fc4s = "0x00 0x00 0x01 0x00 ..."
...
fabric_name = "0x10000027f8e04c49"
...
permanent_port_name = "0xc05076e4588059c1"
port_id = "0x244800"
port_state = "Linkdown"
port_type = "NPort (fabric via point-to-point)"
...
speed = "16 Gbit"
Class = "scsi_host"
...
megabytes = "0 0"
...
requests = "0 0 0"
seconds_active = "37"
...
utilization = "0 0 0"
The second and next invocations produce (abbreviated):
Class = "fc_host"
active_fc4s = "0x00 0x00 0x00 0x00 ..."
...
fabric_name = "0x0"
...
permanent_port_name = "0x0"
port_id = "0x000000"
port_state = "Linkdown"
port_type = "Unknown"
...
speed = "unknown"
Class = "scsi_host"
...
megabytes = "0 0"
...
requests = "0 0 0"
seconds_active = "38"
...
utilization = "0 0 0"
Factor out the resetting of local link dependent fc_host attributes from
zfcp_fsf_exchange_config_data_handler() case
FSF_EXCHANGE_CONFIG_DATA_INCOMPLETE into a new helper function
zfcp_fsf_fc_host_link_down().
All code places that detect local link down (SRB, FSF_PROT_LINK_DOWN,
xconf data/port incomplete) call zfcp_fsf_link_down_info_eval().
Call the new helper from there. This works because
zfcp_fsf_link_down_info_eval() and thus the helper is called before
zfcp_fsf_exchange_{config,port}_evaluate().
Port_name and node_name are always valid, so never reset them.
Get the permanent_port_name from exchange port data unconditionally
as it always has a valid known good value, even during link down.
Note: Rather than hardcode in zfcp_fsf_exchange_config_evaluate(),
fc_host supported_classes could theoretically get its value from
fsf_qtcb_bottom_port.class_of_service in zfcp_fsf_exchange_port_evaluate().
When the link comes back, we get a different notification, perform adapter
recovery, and this triggers an implicit exchange config data followed by
exchange port data filling in the link dependent fc_host attributes with
known good values again.
Signed-off-by: Steffen Maier <maier@xxxxxxxxxxxxx>
Reviewed-by: Jens Remus <jremus@xxxxxxxxxxxxx>
Reviewed-by: Benjamin Block <bblock@xxxxxxxxxxxxx>
---
drivers/s390/scsi/zfcp_fsf.c | 39 +++++++++++++++++++-----------------
1 file changed, 21 insertions(+), 18 deletions(-)
diff --git a/drivers/s390/scsi/zfcp_fsf.c b/drivers/s390/scsi/zfcp_fsf.c
index 31ecbc160482..1fa94277d287 100644
--- a/drivers/s390/scsi/zfcp_fsf.c
+++ b/drivers/s390/scsi/zfcp_fsf.c
@@ -120,6 +120,23 @@ static void zfcp_fsf_status_read_port_closed(struct zfcp_fsf_req *req)
read_unlock_irqrestore(&adapter->port_list_lock, flags);
}
+static void zfcp_fsf_fc_host_link_down(struct zfcp_adapter *adapter)
+{
+ struct Scsi_Host *shost = adapter->scsi_host;
+
+ fc_host_port_id(shost) = 0;
+ fc_host_fabric_name(shost) = 0;
+ fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
+ fc_host_port_type(shost) = FC_PORTTYPE_UNKNOWN;
+ adapter->hydra_version = 0;
+ snprintf(fc_host_model(shost), FC_SYMBOLIC_NAME_SIZE, "0x%04x", 0);
+ memset(fc_host_active_fc4s(shost), 0, FC_FC4_LIST_SIZE);
+
+ adapter->peer_wwpn = 0;
+ adapter->peer_wwnn = 0;
+ adapter->peer_d_id = 0;
+}
+
static void zfcp_fsf_link_down_info_eval(struct zfcp_fsf_req *req,
struct fsf_link_down_info *link_down)
{
@@ -132,6 +149,8 @@ static void zfcp_fsf_link_down_info_eval(struct zfcp_fsf_req *req,
zfcp_scsi_schedule_rports_block(adapter);
+ zfcp_fsf_fc_host_link_down(adapter);
+
if (!link_down)
goto out;
@@ -512,9 +531,6 @@ static int zfcp_fsf_exchange_config_evaluate(struct zfcp_fsf_req *req)
adapter->stat_read_buf_num = max(bottom->status_read_buf_num,
(u16)FSF_STATUS_READS_RECOM);
- if (fc_host_permanent_port_name(shost) == -1)
- fc_host_permanent_port_name(shost) = fc_host_port_name(shost);
-
zfcp_scsi_set_prot(adapter);
/* no error return above here, otherwise must fix call chains */
@@ -608,16 +624,6 @@ static void zfcp_fsf_exchange_config_data_handler(struct zfcp_fsf_req *req)
zfcp_diag_update_xdata(diag_hdr, bottom, true);
req->status |= ZFCP_STATUS_FSFREQ_XDATAINCOMPLETE;
- fc_host_node_name(shost) = 0;
- fc_host_port_name(shost) = 0;
- fc_host_port_id(shost) = 0;
- fc_host_fabric_name(shost) = 0;
- fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
- fc_host_port_type(shost) = FC_PORTTYPE_UNKNOWN;
- adapter->hydra_version = 0;
- snprintf(fc_host_model(shost), FC_SYMBOLIC_NAME_SIZE, "0x%04x",
- 0);
-
/* avoids adapter shutdown to be able to recognize
* events such as LINK UP */
atomic_or(ZFCP_STATUS_ADAPTER_XCONFIG_OK,
@@ -667,10 +673,7 @@ static void zfcp_fsf_exchange_port_evaluate(struct zfcp_fsf_req *req)
if (req->data)
memcpy(req->data, bottom, sizeof(*bottom));
- if (adapter->connection_features & FSF_FEATURE_NPIV_MODE) {
- fc_host_permanent_port_name(shost) = bottom->wwpn;
- } else
- fc_host_permanent_port_name(shost) = fc_host_port_name(shost);
+ fc_host_permanent_port_name(shost) = bottom->wwpn;
fc_host_maxframe_size(shost) = bottom->maximum_frame_size;
fc_host_supported_speeds(shost) =
zfcp_fsf_convert_portspeed(bottom->supported_speed);
@@ -704,9 +707,9 @@ static void zfcp_fsf_exchange_port_data_handler(struct zfcp_fsf_req *req)
zfcp_diag_update_xdata(diag_hdr, bottom, true);
req->status |= ZFCP_STATUS_FSFREQ_XDATAINCOMPLETE;
- zfcp_fsf_exchange_port_evaluate(req);
zfcp_fsf_link_down_info_eval(req,
&qtcb->header.fsf_status_qual.link_down_info);
+ zfcp_fsf_exchange_port_evaluate(req);
break;
}
}
--
2.17.1
