[PATCH 11/23] zfcp: drop duplicate seq_no from zfcp_fsf_req which is also in QTCB header

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There is no point for double bookkeeping especially just for tracing.
The trace can take it from the QTCB which always exists for non-SRB
responses traced with zfcp_dbf_hba_fsf_res().

As a side effect, this removes an alignment hole and reduces the
size of struct zfcp_fsf_req, and thus of each pending request, by
8 bytes.
Before:
$ pahole -C zfcp_fsf_req drivers/s390/scsi/zfcp.ko
...
	struct fsf_qtcb *          qtcb;                 /*   144     8 */
	u32                        seq_no;               /*   152     4 */
	/* XXX 4 bytes hole, try to pack */
	void *                     data;                 /*   160     8 */
...
	/* size: 296, cachelines: 2, members: 14 */
	/* sum members: 288, holes: 2, sum holes: 8 */
	/* last cacheline: 40 bytes */
After:
$ pahole -C zfcp_fsf_req drivers/s390/scsi/zfcp.ko
...
	struct fsf_qtcb *          qtcb;                 /*   144     8 */
	void *                     data;                 /*   152     8 */
...
	/* size: 288, cachelines: 2, members: 13 */
        /* sum members: 284, holes: 1, sum holes: 4 */

Signed-off-by: Steffen Maier <maier@xxxxxxxxxxxxx>
Reviewed-by: Benjamin Block <bblock@xxxxxxxxxxxxx>
---
 drivers/s390/scsi/zfcp_dbf.c | 2 +-
 drivers/s390/scsi/zfcp_def.h | 2 --
 drivers/s390/scsi/zfcp_fsf.c | 1 -
 3 files changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/s390/scsi/zfcp_dbf.c b/drivers/s390/scsi/zfcp_dbf.c
index d20977bb27a4..3503de873963 100644
--- a/drivers/s390/scsi/zfcp_dbf.c
+++ b/drivers/s390/scsi/zfcp_dbf.c
@@ -82,7 +82,7 @@ void zfcp_dbf_hba_fsf_res(char *tag, int level, struct zfcp_fsf_req *req)
 	rec->fsf_req_id = req->req_id;
 	rec->fsf_req_status = req->status;
 	rec->fsf_cmd = q_head->fsf_command;
-	rec->fsf_seq_no = req->seq_no;
+	rec->fsf_seq_no = q_pref->req_seq_no;
 	rec->u.res.req_issued = req->issued;
 	rec->u.res.prot_status = q_pref->prot_status;
 	rec->u.res.fsf_status = q_head->fsf_status;
diff --git a/drivers/s390/scsi/zfcp_def.h b/drivers/s390/scsi/zfcp_def.h
index d65adb0ae9f1..84a742a67975 100644
--- a/drivers/s390/scsi/zfcp_def.h
+++ b/drivers/s390/scsi/zfcp_def.h
@@ -278,7 +278,6 @@ static inline u64 zfcp_scsi_dev_lun(struct scsi_device *sdev)
  * @completion: used to signal the completion of the request
  * @status: status of the request
  * @qtcb: associated QTCB
- * @seq_no: sequence number of this request
  * @data: private data
  * @timer: timer data of this request
  * @erp_action: reference to erp action if request issued on behalf of ERP
@@ -294,7 +293,6 @@ struct zfcp_fsf_req {
 	struct completion	completion;
 	u32			status;
 	struct fsf_qtcb		*qtcb;
-	u32			seq_no;
 	void			*data;
 	struct timer_list	timer;
 	struct zfcp_erp_action	*erp_action;
diff --git a/drivers/s390/scsi/zfcp_fsf.c b/drivers/s390/scsi/zfcp_fsf.c
index 07b86375b461..c949c65ffc6a 100644
--- a/drivers/s390/scsi/zfcp_fsf.c
+++ b/drivers/s390/scsi/zfcp_fsf.c
@@ -724,7 +724,6 @@ static struct zfcp_fsf_req *zfcp_fsf_req_create(struct zfcp_qdio *qdio,
 			return ERR_PTR(-ENOMEM);
 		}
 
-		req->seq_no = adapter->fsf_req_seq_no;
 		req->qtcb->prefix.req_seq_no = adapter->fsf_req_seq_no;
 		req->qtcb->prefix.req_id = req->req_id;
 		req->qtcb->prefix.ulp_info = 26;
-- 
2.16.4




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