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authorBenjamin Block <bblock@linux.ibm.com>2019-10-25 18:12:43 +0200
committerMartin K. Petersen <martin.petersen@oracle.com>2019-10-28 22:16:14 -0400
commit92953c6e0aa77d4febcca6dd691e8192910c8a28 (patch)
tree66df7699250f80f3893b91b600aa93f77ab1ace3
parent7b10db555257d1248398643a23e10cf36b50d516 (diff)
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scsi: zfcp: signal incomplete or error for sync exchange config/port data
Adds a new FSF-Request status flag (ZFCP_STATUS_FSFREQ_XDATAINCOMPLETE) that signal that the data received using Exchange Config Data or Exchange Port Data was incomplete. This new flags is set in the respective handlers during the response path. With this patch, only the synchronous FSF-functions for each command got support for the new flag, otherwise it is transparent. Together with this new flag and already existing status flags the synchronous FSF-functions are extended to now detect whether the received data is complete, incomplete or completely invalid (this includes cases where a command ran into a timeout). This is now signaled back to the caller, where previously only failures on the request path would result in a bad return-code. For complete data the return-code remains 0. For incomplete data a new return-code -EAGAIN is added to the function-interface. For completely invalid data the already existing return-code -EIO is reused - formerly this was used to signal failures on the request path. Existing callers of the FSF-functions are adjusted so that they behave as before for return-code 0 and -EAGAIN, to not change the user-interface. As -EIO existed all along, it was already exposed to the user - and needed handling - and will now also be exposed in this new special case. Link: https://lore.kernel.org/r/e14f0702fa2b00a4d1f37c7981a13f2dd1ea2c83.1572018130.git.bblock@linux.ibm.com Reviewed-by: Steffen Maier <maier@linux.ibm.com> Signed-off-by: Benjamin Block <bblock@linux.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
-rw-r--r--drivers/s390/scsi/zfcp_def.h1
-rw-r--r--drivers/s390/scsi/zfcp_fsf.c46
-rw-r--r--drivers/s390/scsi/zfcp_scsi.c4
-rw-r--r--drivers/s390/scsi/zfcp_sysfs.c4
4 files changed, 46 insertions, 9 deletions
diff --git a/drivers/s390/scsi/zfcp_def.h b/drivers/s390/scsi/zfcp_def.h
index 87d2f47a6990..f5acdb67442e 100644
--- a/drivers/s390/scsi/zfcp_def.h
+++ b/drivers/s390/scsi/zfcp_def.h
@@ -86,6 +86,7 @@
#define ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED 0x00000080
#define ZFCP_STATUS_FSFREQ_TMFUNCFAILED 0x00000200
#define ZFCP_STATUS_FSFREQ_DISMISSED 0x00001000
+#define ZFCP_STATUS_FSFREQ_XDATAINCOMPLETE 0x00020000
/************************* STRUCTURE DEFINITIONS *****************************/
diff --git a/drivers/s390/scsi/zfcp_fsf.c b/drivers/s390/scsi/zfcp_fsf.c
index cf63916814cc..d8f0e446fe13 100644
--- a/drivers/s390/scsi/zfcp_fsf.c
+++ b/drivers/s390/scsi/zfcp_fsf.c
@@ -585,6 +585,8 @@ static void zfcp_fsf_exchange_config_data_handler(struct zfcp_fsf_req *req)
&adapter->status);
break;
case FSF_EXCHANGE_CONFIG_DATA_INCOMPLETE:
+ req->status |= ZFCP_STATUS_FSFREQ_XDATAINCOMPLETE;
+
fc_host_node_name(shost) = 0;
fc_host_port_name(shost) = 0;
fc_host_port_id(shost) = 0;
@@ -663,6 +665,8 @@ static void zfcp_fsf_exchange_port_data_handler(struct zfcp_fsf_req *req)
zfcp_fsf_exchange_port_evaluate(req);
break;
case FSF_EXCHANGE_CONFIG_DATA_INCOMPLETE:
+ 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);
@@ -1278,6 +1282,19 @@ out:
return retval;
}
+
+/**
+ * zfcp_fsf_exchange_config_data_sync() - Request information about FCP channel.
+ * @qdio: pointer to the QDIO-Queue to use for sending the command.
+ * @data: pointer to the QTCB-Bottom for storing the result of the command,
+ * might be %NULL.
+ *
+ * Returns:
+ * * 0 - Exchange Config Data was successful, @data is complete
+ * * -EIO - Exchange Config Data was not successful, @data is invalid
+ * * -EAGAIN - @data contains incomplete data
+ * * -ENOMEM - Some memory allocation failed along the way
+ */
int zfcp_fsf_exchange_config_data_sync(struct zfcp_qdio *qdio,
struct fsf_qtcb_bottom_config *data)
{
@@ -1309,9 +1326,16 @@ int zfcp_fsf_exchange_config_data_sync(struct zfcp_qdio *qdio,
zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
retval = zfcp_fsf_req_send(req);
spin_unlock_irq(&qdio->req_q_lock);
+
if (!retval) {
/* NOTE: ONLY TOUCH SYNC req AGAIN ON req->completion. */
wait_for_completion(&req->completion);
+
+ if (req->status &
+ (ZFCP_STATUS_FSFREQ_ERROR | ZFCP_STATUS_FSFREQ_DISMISSED))
+ retval = -EIO;
+ else if (req->status & ZFCP_STATUS_FSFREQ_XDATAINCOMPLETE)
+ retval = -EAGAIN;
}
zfcp_fsf_req_free(req);
@@ -1369,10 +1393,17 @@ out:
}
/**
- * zfcp_fsf_exchange_port_data_sync - request information about local port
- * @qdio: pointer to struct zfcp_qdio
- * @data: pointer to struct fsf_qtcb_bottom_port
- * Returns: 0 on success, error otherwise
+ * zfcp_fsf_exchange_port_data_sync() - Request information about local port.
+ * @qdio: pointer to the QDIO-Queue to use for sending the command.
+ * @data: pointer to the QTCB-Bottom for storing the result of the command,
+ * might be %NULL.
+ *
+ * Returns:
+ * * 0 - Exchange Port Data was successful, @data is complete
+ * * -EIO - Exchange Port Data was not successful, @data is invalid
+ * * -EAGAIN - @data contains incomplete data
+ * * -ENOMEM - Some memory allocation failed along the way
+ * * -EOPNOTSUPP - This operation is not supported
*/
int zfcp_fsf_exchange_port_data_sync(struct zfcp_qdio *qdio,
struct fsf_qtcb_bottom_port *data)
@@ -1408,10 +1439,15 @@ int zfcp_fsf_exchange_port_data_sync(struct zfcp_qdio *qdio,
if (!retval) {
/* NOTE: ONLY TOUCH SYNC req AGAIN ON req->completion. */
wait_for_completion(&req->completion);
+
+ if (req->status &
+ (ZFCP_STATUS_FSFREQ_ERROR | ZFCP_STATUS_FSFREQ_DISMISSED))
+ retval = -EIO;
+ else if (req->status & ZFCP_STATUS_FSFREQ_XDATAINCOMPLETE)
+ retval = -EAGAIN;
}
zfcp_fsf_req_free(req);
-
return retval;
out_unlock:
diff --git a/drivers/s390/scsi/zfcp_scsi.c b/drivers/s390/scsi/zfcp_scsi.c
index e9ded2befa0d..3910d529c15a 100644
--- a/drivers/s390/scsi/zfcp_scsi.c
+++ b/drivers/s390/scsi/zfcp_scsi.c
@@ -605,7 +605,7 @@ zfcp_scsi_get_fc_host_stats(struct Scsi_Host *host)
return NULL;
ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
- if (ret) {
+ if (ret != 0 && ret != -EAGAIN) {
kfree(data);
return NULL;
}
@@ -634,7 +634,7 @@ static void zfcp_scsi_reset_fc_host_stats(struct Scsi_Host *shost)
return;
ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
- if (ret)
+ if (ret != 0 && ret != -EAGAIN)
kfree(data);
else {
adapter->stats_reset = jiffies/HZ;
diff --git a/drivers/s390/scsi/zfcp_sysfs.c b/drivers/s390/scsi/zfcp_sysfs.c
index af197e2b3e69..90d851d49410 100644
--- a/drivers/s390/scsi/zfcp_sysfs.c
+++ b/drivers/s390/scsi/zfcp_sysfs.c
@@ -577,7 +577,7 @@ static ssize_t zfcp_sysfs_adapter_util_show(struct device *dev,
return -ENOMEM;
retval = zfcp_fsf_exchange_port_data_sync(adapter->qdio, qtcb_port);
- if (!retval)
+ if (retval == 0 || retval == -EAGAIN)
retval = sprintf(buf, "%u %u %u\n", qtcb_port->cp_util,
qtcb_port->cb_util, qtcb_port->a_util);
kfree(qtcb_port);
@@ -603,7 +603,7 @@ static int zfcp_sysfs_adapter_ex_config(struct device *dev,
return -ENOMEM;
retval = zfcp_fsf_exchange_config_data_sync(adapter->qdio, qtcb_config);
- if (!retval)
+ if (retval == 0 || retval == -EAGAIN)
*stat_inf = qtcb_config->stat_info;
kfree(qtcb_config);