scsi: zfcp: enhance handling of FC Endpoint Security errors

Enable for explicit FCP channel FC Endpoint Security error reporting and
handle any FSF security errors according to specification. Take the
following recovery actions when a FSF_SECURITY_ERROR is reported for the
specified FSF commands:

- Open Port: Retry the command if possible
- Send FCP : Physically close the remote port and reopen

For Open Port the command status is set to error, which triggers a retry.
For Send FCP the command status is set to error and recovery is triggered
to physically reopen the remote port.

Link: https://lore.kernel.org/r/20200312174505.51294-10-maier@linux.ibm.com
Reviewed-by: Steffen Maier <maier@linux.ibm.com>
Signed-off-by: Jens Remus <jremus@linux.ibm.com>
Signed-off-by: Steffen Maier <maier@linux.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/s390/scsi/zfcp_fsf.c b/drivers/s390/scsi/zfcp_fsf.c
index 1d3eac1..e8d0bf0 100644 (file)
--- a/drivers/s390/scsi/zfcp_fsf.c
+++ b/drivers/s390/scsi/zfcp_fsf.c
@@ -1405,7 +1405,8 @@ int zfcp_fsf_exchange_config_data(struct zfcp_erp_action *erp_action)
        req->qtcb->bottom.config.feature_selection =
                        FSF_FEATURE_NOTIFICATION_LOST |
                        FSF_FEATURE_UPDATE_ALERT |
-                       FSF_FEATURE_REQUEST_SFP_DATA;
+                       FSF_FEATURE_REQUEST_SFP_DATA |
+                       FSF_FEATURE_FC_SECURITY;
        req->erp_action = erp_action;
        req->handler = zfcp_fsf_exchange_config_data_handler;
        erp_action->fsf_req_id = req->req_id;
@@ -1459,7 +1460,8 @@ int zfcp_fsf_exchange_config_data_sync(struct zfcp_qdio *qdio,
        req->qtcb->bottom.config.feature_selection =
                        FSF_FEATURE_NOTIFICATION_LOST |
                        FSF_FEATURE_UPDATE_ALERT |
-                       FSF_FEATURE_REQUEST_SFP_DATA;
+                       FSF_FEATURE_REQUEST_SFP_DATA |
+                       FSF_FEATURE_FC_SECURITY;
 
        if (data)
                req->data = data;
@@ -1668,6 +1670,9 @@ static void zfcp_fsf_open_port_handler(struct zfcp_fsf_req *req)
                                         ZFCP_STATUS_COMMON_ERP_FAILED);
                req->status |= ZFCP_STATUS_FSFREQ_ERROR;
                break;
+       case FSF_SECURITY_ERROR:
+               req->status |= ZFCP_STATUS_FSFREQ_ERROR;
+               break;
        case FSF_ADAPTER_STATUS_AVAILABLE:
                switch (header->fsf_status_qual.word[0]) {
                case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
@@ -2398,6 +2403,10 @@ static void zfcp_fsf_fcp_handler_common(struct zfcp_fsf_req *req,
                        zfcp_fc_test_link(zfcp_sdev->port);
                req->status |= ZFCP_STATUS_FSFREQ_ERROR;
                break;
+       case FSF_SECURITY_ERROR:
+               zfcp_erp_port_forced_reopen(zfcp_sdev->port, 0, "fssfch7");
+               req->status |= ZFCP_STATUS_FSFREQ_ERROR;
+               break;
        }
 }
 

diff --git a/drivers/s390/scsi/zfcp_fsf.h b/drivers/s390/scsi/zfcp_fsf.h
index 66de170..c6a56f9 100644 (file)
--- a/drivers/s390/scsi/zfcp_fsf.h
+++ b/drivers/s390/scsi/zfcp_fsf.h
@@ -78,6 +78,7 @@
 #define FSF_BLOCK_GUARD_CHECK_FAILURE          0x00000081
 #define FSF_APP_TAG_CHECK_FAILURE              0x00000082
 #define FSF_REF_TAG_CHECK_FAILURE              0x00000083
+#define FSF_SECURITY_ERROR                     0x00000090
 #define FSF_ADAPTER_STATUS_AVAILABLE           0x000000AD
 #define FSF_FCP_RSP_AVAILABLE                  0x000000AF
 #define FSF_UNKNOWN_COMMAND                    0x000000E2