[PATCH 4/5] scsi: fnic: use blk_mq_tagset_busy_iter() to walk scsi commands in fnic_rport_exch_reset

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So far, scsi_host_find_tag() is supposed to use in fast path and the
passed tag should be active.

Convert the scsi command walking into blk_mq_tagset_busy_iter(), which has been one
common pattern for handling failure.

Cc: Satish Kharat <satishkh@xxxxxxxxx>
Cc: Karan Tilak Kumar <kartilak@xxxxxxxxx>
Cc: David Jeffery <djeffery@xxxxxxxxxx>
Signed-off-by: Ming Lei <ming.lei@xxxxxxxxxx>
---
 drivers/scsi/fnic/fnic_scsi.c | 202 ++++++++++++++++++----------------
 1 file changed, 107 insertions(+), 95 deletions(-)

diff --git a/drivers/scsi/fnic/fnic_scsi.c b/drivers/scsi/fnic/fnic_scsi.c
index f052526066c1..ecbf4f5c5a07 100644
--- a/drivers/scsi/fnic/fnic_scsi.c
+++ b/drivers/scsi/fnic/fnic_scsi.c
@@ -1559,124 +1559,136 @@ static inline int fnic_queue_abort_io_req(struct fnic *fnic, int tag,
 	return 0;
 }
 
-static void fnic_rport_exch_reset(struct fnic *fnic, u32 port_id)
+struct fnic_reset_data {
+	u32 port_id;
+	int term_cnt;
+};
+
+static bool fnic_reset_cmd(struct request *req, void *data, bool reserved)
 {
+	struct fnic_reset_data *reset_data = data;
 	int tag;
 	int abt_tag;
-	int term_cnt = 0;
 	struct fnic_io_req *io_req;
 	spinlock_t *io_lock;
 	unsigned long flags;
-	struct scsi_cmnd *sc;
-	struct reset_stats *reset_stats = &fnic->fnic_stats.reset_stats;
-	struct terminate_stats *term_stats = &fnic->fnic_stats.term_stats;
 	struct scsi_lun fc_lun;
 	enum fnic_ioreq_state old_ioreq_state;
+	struct scsi_cmnd *sc = blk_mq_rq_to_pdu(req);
+	struct fc_lport *lp = shost_priv(sc->device->host);
+	struct fnic *fnic = lport_priv(lp);
+	struct reset_stats *reset_stats = &fnic->fnic_stats.reset_stats;
+	struct terminate_stats *term_stats = &fnic->fnic_stats.term_stats;
 
-	FNIC_SCSI_DBG(KERN_DEBUG,
-		      fnic->lport->host,
-		      "fnic_rport_exch_reset called portid 0x%06x\n",
-		      port_id);
+	tag = req->tag;
+	abt_tag = tag;
+	io_lock = fnic_io_lock_tag(fnic, tag);
+	spin_lock_irqsave(io_lock, flags);
 
-	if (fnic->in_remove)
-		return;
+	io_req = (struct fnic_io_req *)CMD_SP(sc);
 
-	for (tag = 0; tag < fnic->fnic_max_tag_id; tag++) {
-		abt_tag = tag;
-		io_lock = fnic_io_lock_tag(fnic, tag);
-		spin_lock_irqsave(io_lock, flags);
-		sc = scsi_host_find_tag(fnic->lport->host, tag);
-		if (!sc) {
-			spin_unlock_irqrestore(io_lock, flags);
-			continue;
-		}
+	if (!io_req || io_req->port_id != reset_data->port_id)
+		goto unlock;
 
-		io_req = (struct fnic_io_req *)CMD_SP(sc);
+	if ((CMD_FLAGS(sc) & FNIC_DEVICE_RESET) &&
+		(!(CMD_FLAGS(sc) & FNIC_DEV_RST_ISSUED))) {
+		FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
+		"fnic_rport_exch_reset dev rst not pending sc 0x%p\n",
+		sc);
+		goto unlock;
+	}
 
-		if (!io_req || io_req->port_id != port_id) {
-			spin_unlock_irqrestore(io_lock, flags);
-			continue;
-		}
+	/*
+	 * Found IO that is still pending with firmware and
+	 * belongs to rport that went away
+	 */
+	if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING)
+		goto unlock;
 
-		if ((CMD_FLAGS(sc) & FNIC_DEVICE_RESET) &&
-			(!(CMD_FLAGS(sc) & FNIC_DEV_RST_ISSUED))) {
-			FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
-			"fnic_rport_exch_reset dev rst not pending sc 0x%p\n",
-			sc);
-			spin_unlock_irqrestore(io_lock, flags);
-			continue;
-		}
+	if (io_req->abts_done) {
+		shost_printk(KERN_ERR, fnic->lport->host,
+		"fnic_rport_exch_reset: io_req->abts_done is set "
+		"state is %s\n",
+		fnic_ioreq_state_to_str(CMD_STATE(sc)));
+	}
 
-		/*
-		 * Found IO that is still pending with firmware and
-		 * belongs to rport that went away
-		 */
-		if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) {
-			spin_unlock_irqrestore(io_lock, flags);
-			continue;
-		}
-		if (io_req->abts_done) {
-			shost_printk(KERN_ERR, fnic->lport->host,
-			"fnic_rport_exch_reset: io_req->abts_done is set "
-			"state is %s\n",
-			fnic_ioreq_state_to_str(CMD_STATE(sc)));
-		}
+	if (!(CMD_FLAGS(sc) & FNIC_IO_ISSUED)) {
+		shost_printk(KERN_ERR, fnic->lport->host,
+			  "rport_exch_reset "
+			  "IO not yet issued %p tag 0x%x flags "
+			  "%x state %d\n",
+			  sc, tag, CMD_FLAGS(sc), CMD_STATE(sc));
+	}
+	old_ioreq_state = CMD_STATE(sc);
+	CMD_STATE(sc) = FNIC_IOREQ_ABTS_PENDING;
+	CMD_ABTS_STATUS(sc) = FCPIO_INVALID_CODE;
+	if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET) {
+		atomic64_inc(&reset_stats->device_reset_terminates);
+		abt_tag = (tag | FNIC_TAG_DEV_RST);
+		FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
+		"fnic_rport_exch_reset dev rst sc 0x%p\n",
+		sc);
+	}
 
-		if (!(CMD_FLAGS(sc) & FNIC_IO_ISSUED)) {
-			shost_printk(KERN_ERR, fnic->lport->host,
-				  "rport_exch_reset "
-				  "IO not yet issued %p tag 0x%x flags "
-				  "%x state %d\n",
-				  sc, tag, CMD_FLAGS(sc), CMD_STATE(sc));
-		}
-		old_ioreq_state = CMD_STATE(sc);
-		CMD_STATE(sc) = FNIC_IOREQ_ABTS_PENDING;
-		CMD_ABTS_STATUS(sc) = FCPIO_INVALID_CODE;
-		if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET) {
-			atomic64_inc(&reset_stats->device_reset_terminates);
-			abt_tag = (tag | FNIC_TAG_DEV_RST);
-			FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
-			"fnic_rport_exch_reset dev rst sc 0x%p\n",
-			sc);
-		}
+	BUG_ON(io_req->abts_done);
 
-		BUG_ON(io_req->abts_done);
+	FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
+		      "fnic_rport_reset_exch: Issuing abts\n");
 
-		FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
-			      "fnic_rport_reset_exch: Issuing abts\n");
+	spin_unlock_irqrestore(io_lock, flags);
 
+	/* Now queue the abort command to firmware */
+	int_to_scsilun(sc->device->lun, &fc_lun);
+
+	if (fnic_queue_abort_io_req(fnic, abt_tag,
+				    FCPIO_ITMF_ABT_TASK_TERM,
+				    fc_lun.scsi_lun, io_req)) {
+		/*
+		 * Revert the cmd state back to old state, if
+		 * it hasn't changed in between. This cmd will get
+		 * aborted later by scsi_eh, or cleaned up during
+		 * lun reset
+		 */
+		spin_lock_irqsave(io_lock, flags);
+		if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING)
+			CMD_STATE(sc) = old_ioreq_state;
 		spin_unlock_irqrestore(io_lock, flags);
+	} else {
+		spin_lock_irqsave(io_lock, flags);
+		if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET)
+			CMD_FLAGS(sc) |= FNIC_DEV_RST_TERM_ISSUED;
+		else
+			CMD_FLAGS(sc) |= FNIC_IO_INTERNAL_TERM_ISSUED;
+		spin_unlock_irqrestore(io_lock, flags);
+		atomic64_inc(&term_stats->terminates);
+		reset_data->term_cnt++;
+	}
+	return true;
+unlock:
+	spin_unlock_irqrestore(io_lock, flags);
+	return true;
+}
 
-		/* Now queue the abort command to firmware */
-		int_to_scsilun(sc->device->lun, &fc_lun);
+static void fnic_rport_exch_reset(struct fnic *fnic, u32 port_id)
+{
+	struct fnic_reset_data data = {
+		.port_id	=	port_id,
+		.term_cnt	=	0,
+	};
 
-		if (fnic_queue_abort_io_req(fnic, abt_tag,
-					    FCPIO_ITMF_ABT_TASK_TERM,
-					    fc_lun.scsi_lun, io_req)) {
-			/*
-			 * Revert the cmd state back to old state, if
-			 * it hasn't changed in between. This cmd will get
-			 * aborted later by scsi_eh, or cleaned up during
-			 * lun reset
-			 */
-			spin_lock_irqsave(io_lock, flags);
-			if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING)
-				CMD_STATE(sc) = old_ioreq_state;
-			spin_unlock_irqrestore(io_lock, flags);
-		} else {
-			spin_lock_irqsave(io_lock, flags);
-			if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET)
-				CMD_FLAGS(sc) |= FNIC_DEV_RST_TERM_ISSUED;
-			else
-				CMD_FLAGS(sc) |= FNIC_IO_INTERNAL_TERM_ISSUED;
-			spin_unlock_irqrestore(io_lock, flags);
-			atomic64_inc(&term_stats->terminates);
-			term_cnt++;
-		}
-	}
-	if (term_cnt > atomic64_read(&term_stats->max_terminates))
-		atomic64_set(&term_stats->max_terminates, term_cnt);
+	FNIC_SCSI_DBG(KERN_DEBUG,
+		      fnic->lport->host,
+		      "fnic_rport_exch_reset called portid 0x%06x\n",
+		      port_id);
+
+	if (fnic->in_remove)
+		return;
+
+	blk_mq_tagset_busy_iter(&fnic->lport->host->tag_set,
+			fnic_reset_cmd, &data);
 
+	if (data.term_cnt > atomic64_read(&fnic->fnic_stats.term_stats.max_terminates))
+		atomic64_set(&fnic->fnic_stats.term_stats.max_terminates, data.term_cnt);
 }
 
 static bool fnic_terminate_cmd(struct request *req, void *data, bool reserved)
-- 
2.29.2




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