[PATCH v5 16/49] scsi: bfa: Stop using the SCSI pointer

From: Bart Van Assche <bvanassche@acm.org>
To: "Martin K . Petersen" <martin.petersen@oracle.com>
Cc: linux-scsi@vger.kernel.org, Bart Van Assche <bvanassche@acm.org>,
	Himanshu Madhani <himanshu.madhani@oracle.com>,
	Hannes Reinecke <hare@suse.de>,
	Anil Gurumurthy <anil.gurumurthy@qlogic.com>,
	Sudarsana Kalluru <sudarsana.kalluru@qlogic.com>,
	"James E.J. Bottomley" <jejb@linux.ibm.com>
Subject: [PATCH v5 16/49] scsi: bfa: Stop using the SCSI pointer
Date: Fri, 18 Feb 2022 11:50:44 -0800	[thread overview]
Message-ID: <20220218195117.25689-17-bvanassche@acm.org> (raw)
In-Reply-To: <20220218195117.25689-1-bvanassche@acm.org>

Set .cmd_size in the SCSI host template instead of using the SCSI pointer
from struct scsi_cmnd. This patch prepares for removal of the SCSI pointer
from struct scsi_cmnd.

Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
---
 drivers/scsi/bfa/bfad_im.c | 27 ++++++++++++++-------------
 drivers/scsi/bfa/bfad_im.h | 16 ++++++++++++++++
 2 files changed, 30 insertions(+), 13 deletions(-)

diff --git a/drivers/scsi/bfa/bfad_im.c b/drivers/scsi/bfa/bfad_im.c
index 759d2bb1ecdd..8419a1a89485 100644
--- a/drivers/scsi/bfa/bfad_im.c
+++ b/drivers/scsi/bfa/bfad_im.c
@@ -150,10 +150,10 @@ bfa_cb_tskim_done(void *bfad, struct bfad_tskim_s *dtsk,
 	struct scsi_cmnd *cmnd = (struct scsi_cmnd *)dtsk;
 	wait_queue_head_t *wq;
 
-	cmnd->SCp.Status |= tsk_status << 1;
-	set_bit(IO_DONE_BIT, (unsigned long *)&cmnd->SCp.Status);
-	wq = (wait_queue_head_t *) cmnd->SCp.ptr;
-	cmnd->SCp.ptr = NULL;
+	bfad_priv(cmnd)->status |= tsk_status << 1;
+	set_bit(IO_DONE_BIT, &bfad_priv(cmnd)->status);
+	wq = bfad_priv(cmnd)->wq;
+	bfad_priv(cmnd)->wq = NULL;
 
 	if (wq)
 		wake_up(wq);
@@ -259,7 +259,7 @@ bfad_im_target_reset_send(struct bfad_s *bfad, struct scsi_cmnd *cmnd,
 	 * happens.
 	 */
 	cmnd->host_scribble = NULL;
-	cmnd->SCp.Status = 0;
+	bfad_priv(cmnd)->status = 0;
 	bfa_itnim = bfa_fcs_itnim_get_halitn(&itnim->fcs_itnim);
 	/*
 	 * bfa_itnim can be NULL if the port gets disconnected and the bfa
@@ -326,8 +326,8 @@ bfad_im_reset_lun_handler(struct scsi_cmnd *cmnd)
 	 * if happens.
 	 */
 	cmnd->host_scribble = NULL;
-	cmnd->SCp.ptr = (char *)&wq;
-	cmnd->SCp.Status = 0;
+	bfad_priv(cmnd)->wq = &wq;
+	bfad_priv(cmnd)->status = 0;
 	bfa_itnim = bfa_fcs_itnim_get_halitn(&itnim->fcs_itnim);
 	/*
 	 * bfa_itnim can be NULL if the port gets disconnected and the bfa
@@ -347,10 +347,9 @@ bfad_im_reset_lun_handler(struct scsi_cmnd *cmnd)
 			    FCP_TM_LUN_RESET, BFAD_LUN_RESET_TMO);
 	spin_unlock_irqrestore(&bfad->bfad_lock, flags);
 
-	wait_event(wq, test_bit(IO_DONE_BIT,
-			(unsigned long *)&cmnd->SCp.Status));
+	wait_event(wq, test_bit(IO_DONE_BIT, &bfad_priv(cmnd)->status));
 
-	task_status = cmnd->SCp.Status >> 1;
+	task_status = bfad_priv(cmnd)->status >> 1;
 	if (task_status != BFI_TSKIM_STS_OK) {
 		BFA_LOG(KERN_ERR, bfad, bfa_log_level,
 			"LUN reset failure, status: %d\n", task_status);
@@ -381,16 +380,16 @@ bfad_im_reset_target_handler(struct scsi_cmnd *cmnd)
 	spin_lock_irqsave(&bfad->bfad_lock, flags);
 	itnim = bfad_get_itnim(im_port, starget->id);
 	if (itnim) {
-		cmnd->SCp.ptr = (char *)&wq;
+		bfad_priv(cmnd)->wq = &wq;
 		rc = bfad_im_target_reset_send(bfad, cmnd, itnim);
 		if (rc == BFA_STATUS_OK) {
 			/* wait target reset to complete */
 			spin_unlock_irqrestore(&bfad->bfad_lock, flags);
 			wait_event(wq, test_bit(IO_DONE_BIT,
-					(unsigned long *)&cmnd->SCp.Status));
+						&bfad_priv(cmnd)->status));
 			spin_lock_irqsave(&bfad->bfad_lock, flags);
 
-			task_status = cmnd->SCp.Status >> 1;
+			task_status = bfad_priv(cmnd)->status >> 1;
 			if (task_status != BFI_TSKIM_STS_OK)
 				BFA_LOG(KERN_ERR, bfad, bfa_log_level,
 					"target reset failure,"
@@ -797,6 +796,7 @@ struct scsi_host_template bfad_im_scsi_host_template = {
 	.name = BFAD_DRIVER_NAME,
 	.info = bfad_im_info,
 	.queuecommand = bfad_im_queuecommand,
+	.cmd_size = sizeof(struct bfad_cmd_priv),
 	.eh_timed_out = fc_eh_timed_out,
 	.eh_abort_handler = bfad_im_abort_handler,
 	.eh_device_reset_handler = bfad_im_reset_lun_handler,
@@ -819,6 +819,7 @@ struct scsi_host_template bfad_im_vport_template = {
 	.name = BFAD_DRIVER_NAME,
 	.info = bfad_im_info,
 	.queuecommand = bfad_im_queuecommand,
+	.cmd_size = sizeof(struct bfad_cmd_priv),
 	.eh_timed_out = fc_eh_timed_out,
 	.eh_abort_handler = bfad_im_abort_handler,
 	.eh_device_reset_handler = bfad_im_reset_lun_handler,
diff --git a/drivers/scsi/bfa/bfad_im.h b/drivers/scsi/bfa/bfad_im.h
index 829345b514d1..c03b225ea1ba 100644
--- a/drivers/scsi/bfa/bfad_im.h
+++ b/drivers/scsi/bfa/bfad_im.h
@@ -43,6 +43,22 @@ u32 bfad_im_supported_speeds(struct bfa_s *bfa);
  */
 #define IO_DONE_BIT			0
 
+/**
+ * struct bfad_cmd_priv - private data per SCSI command.
+ * @status: Lowest bit represents IO_DONE. The next seven bits hold a value of
+ * type enum bfi_tskim_status.
+ * @wq: Wait queue used to wait for completion of an operation.
+ */
+struct bfad_cmd_priv {
+	unsigned long status;
+	wait_queue_head_t *wq;
+};
+
+static inline struct bfad_cmd_priv *bfad_priv(struct scsi_cmnd *cmd)
+{
+	return scsi_cmd_priv(cmd);
+}
+
 struct bfad_itnim_data_s {
 	struct bfad_itnim_s *itnim;
 };
