zfcp: fix D_ID field with actual value on tracing SAN responses

commit 771bf03537ddfa4a4dde62ef9dfbc82e4f77ab20 upstream.

With commit 2c55b750a884b86dea8b4cc5f15e1484cc47a25c
("[SCSI] zfcp: Redesign of the debug tracing for SAN records.")
we lost the N_Port-ID where an ELS response comes from.
With commit 7c7dc196814b9e1d5cc254dc579a5fa78ae524f7
("[SCSI] zfcp: Simplify handling of ct and els requests")
we lost the N_Port-ID where a CT response comes from.
It's especially useful if the request SAN trace record
with D_ID was already lost due to trace buffer wrap.

GS uses an open WKA port handle and ELS just a D_ID, and
only for ELS we could get D_ID from QTCB bottom via zfcp_fsf_req.
To cover both cases, add a new field to zfcp_fsf_ct_els
and fill it in on request to use in SAN response trace.
Strictly speaking the D_ID on SAN response is the FC frame's S_ID.
We don't need a field for the other end which is always us.

Signed-off-by: Steffen Maier <maier@linux.vnet.ibm.com>
Fixes: 2c55b750a884 ("[SCSI] zfcp: Redesign of the debug tracing for SAN records.")
Fixes: 7c7dc196814b ("[SCSI] zfcp: Simplify handling of ct and els requests")
Reviewed-by: Benjamin Block <bblock@linux.vnet.ibm.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/s390/scsi/zfcp_dbf.c b/drivers/s390/scsi/zfcp_dbf.c
index ceb934c93232a378c37ce40afcdeebb89fa6e36e..968897f5e1c6e6df68d939f6aab1fd85f702ddd6 100644 (file)
--- a/drivers/s390/scsi/zfcp_dbf.c
+++ b/drivers/s390/scsi/zfcp_dbf.c
@@ -407,7 +407,7 @@ void zfcp_dbf_san_res(char *tag, struct zfcp_fsf_req *fsf)
 
        length = (u16)(ct_els->resp->length + FC_CT_HDR_LEN);
        zfcp_dbf_san(tag, dbf, sg_virt(ct_els->resp), ZFCP_DBF_SAN_RES, length,
-                    fsf->req_id, 0);
+                    fsf->req_id, ct_els->d_id);
 }
 
 /**

diff --git a/drivers/s390/scsi/zfcp_fsf.c b/drivers/s390/scsi/zfcp_fsf.c
index f56906f09bb3ea762cd5e2530c95d082b28d3ebe..75f820ca17b79b0574e3afd91df18998a3438c30 100644 (file)
--- a/drivers/s390/scsi/zfcp_fsf.c
+++ b/drivers/s390/scsi/zfcp_fsf.c
@@ -1079,6 +1079,7 @@ int zfcp_fsf_send_ct(struct zfcp_fc_wka_port *wka_port,
 
        req->handler = zfcp_fsf_send_ct_handler;
        req->qtcb->header.port_handle = wka_port->handle;
+       ct->d_id = wka_port->d_id;
        req->data = ct;
 
        zfcp_dbf_san_req("fssct_1", req, wka_port->d_id);
@@ -1175,6 +1176,7 @@ int zfcp_fsf_send_els(struct zfcp_adapter *adapter, u32 d_id,
 
        hton24(req->qtcb->bottom.support.d_id, d_id);
        req->handler = zfcp_fsf_send_els_handler;
+       els->d_id = d_id;
        req->data = els;
 
        zfcp_dbf_san_req("fssels1", req, d_id);

diff --git a/drivers/s390/scsi/zfcp_fsf.h b/drivers/s390/scsi/zfcp_fsf.h
index 57ae3ae1046d126d6dfe6769e2885bc8f210a7a9..be1c04b334c51f678d643e4c488173f8fd6be0ee 100644 (file)
--- a/drivers/s390/scsi/zfcp_fsf.h
+++ b/drivers/s390/scsi/zfcp_fsf.h
@@ -3,7 +3,7 @@
  *
  * Interface to the FSF support functions.
  *
- * Copyright IBM Corp. 2002, 2010
+ * Copyright IBM Corp. 2002, 2015
  */
 
 #ifndef FSF_H
@@ -436,6 +436,7 @@ struct zfcp_blk_drv_data {
  * @handler_data: data passed to handler function
  * @port: Optional pointer to port for zfcp internal ELS (only test link ADISC)
  * @status: used to pass error status to calling function
+ * @d_id: Destination ID of either open WKA port for CT or of D_ID for ELS
  */
 struct zfcp_fsf_ct_els {
        struct scatterlist *req;
@@ -444,6 +445,7 @@ struct zfcp_fsf_ct_els {
        void *handler_data;
        struct zfcp_port *port;
        int status;
+       u32 d_id;
 };
 
 #endif                         /* FSF_H */