[PATCH] PATCH [9/15] qla2xxx: Tape command handling fixes

  Fix several problems when handling commands issued to tape devices:

  	1) insure commands are not prematurely returned to the mid-layer
  	   with a failed status during loop/fabric transitions.

  	2) tape commands tend to have rather 'long' timeout values,
  	   unfortunately, as the these values increase into the 17 to
  	   20 minute range (and larger), the cumulative skew of the
  	   RISC's own timer result in commands being held for seconds
  	   beyond their defined timeout values.  Compensate for this
  	   in the driver's command timeout function.

 drivers/scsi/qla2xxx/qla_def.h  |    3 +
 drivers/scsi/qla2xxx/qla_init.c |    4 ++
 drivers/scsi/qla2xxx/qla_isr.c  |   10 ++---
 drivers/scsi/qla2xxx/qla_os.c   |   74 ++++++++++++++++++++++++++++++++++++----
 4 files changed, 79 insertions(+), 12 deletions(-)

drivers/scsi/qla2xxx/qla_def.h

@@ -286,6 +286,7 @@ typedef struct srb {
 #define SRB_BUSY		BIT_8	/* Command is in busy retry state */
 #define SRB_FO_CANCEL		BIT_9	/* Command don't need to do failover */
 #define SRB_IOCTL		BIT_10	/* IOCTL command. */
+#define SRB_TAPE		BIT_11	/* FCP2 (Tape) command. */
 
 /*
  * SRB state definitions

drivers/scsi/qla2xxx/qla_init.c

@@ -3140,6 +3140,10 @@ qla2x00_restart_queues(scsi_qla_host_t *ha, uint8_t flush)
 		spin_lock_irqsave(&ha->list_lock,flags);
 		list_for_each_safe(list, temp, &ha->pending_queue) {
 			sp = list_entry(list, srb_t, list);
+
+			if ((sp->flags & SRB_TAPE))
+				continue;
+			 
 			/* 
 			 * When time expire return request back to OS as BUSY 
 			 */

drivers/scsi/qla2xxx/qla_isr.c

@@ -907,7 +907,7 @@ qla2x00_status_entry(scsi_qla_host_t *ha, sts_entry_t *pkt)
 	 * If loop is in transient state Report DID_BUS_BUSY
 	 */
 	if ((comp_status != CS_COMPLETE || scsi_status != 0)) {
-		if (!(sp->flags & SRB_IOCTL) &&
+		if (!(sp->flags & (SRB_IOCTL | SRB_TAPE)) &&
 		    (atomic_read(&ha->loop_down_timer) ||
 			atomic_read(&ha->loop_state) != LOOP_READY)) {
 
@@ -986,7 +986,7 @@ qla2x00_status_entry(scsi_qla_host_t *ha, sts_entry_t *pkt)
 		if (sp->request_sense_length != 0)
 			ha->status_srb = sp;
 
-		if (!(sp->flags & SRB_IOCTL) &&
+		if (!(sp->flags & (SRB_IOCTL | SRB_TAPE)) &&
 		    qla2x00_check_sense(cp, lq) == QLA_SUCCESS) {
 			/* Throw away status_cont if any */
 			ha->status_srb = NULL;
@@ -1053,7 +1053,7 @@ qla2x00_status_entry(scsi_qla_host_t *ha, sts_entry_t *pkt)
 			if (sp->request_sense_length != 0)
 				ha->status_srb = sp;
 
-			if (!(sp->flags & SRB_IOCTL) &&
+			if (!(sp->flags & (SRB_IOCTL | SRB_TAPE)) &&
 			    (qla2x00_check_sense(cp, lq) == QLA_SUCCESS)) {
 				ha->status_srb = NULL;
 				add_to_scsi_retry_queue(ha, sp);
@@ -1137,7 +1137,7 @@ qla2x00_status_entry(scsi_qla_host_t *ha, sts_entry_t *pkt)
 		    ha->host_no, t, l, cp->serial_number, comp_status,
 		    atomic_read(&fcport->state)));
 
-		if ((sp->flags & SRB_IOCTL) ||
+		if ((sp->flags & (SRB_IOCTL | SRB_TAPE)) ||
 		    atomic_read(&fcport->state) == FCS_DEVICE_DEAD) {
 			cp->result = DID_NO_CONNECT << 16;
 			if (atomic_read(&ha->loop_state) == LOOP_DOWN) 
@@ -1162,7 +1162,7 @@ qla2x00_status_entry(scsi_qla_host_t *ha, sts_entry_t *pkt)
 		    "scsi(%ld): RESET status detected 0x%x-0x%x.\n",
 		    ha->host_no, comp_status, scsi_status));
 
-		if (sp->flags & SRB_IOCTL) {
+		if (sp->flags & (SRB_IOCTL | SRB_TAPE)) {
 			cp->result = DID_RESET << 16;
 		} else {
 			qla2x00_extend_timeout(cp, EXTEND_CMD_TIMEOUT);

drivers/scsi/qla2xxx/qla_os.c

@@ -775,10 +775,13 @@ qla2x00_queuecommand(struct scsi_cmnd *cmd, void (*fn)(struct scsi_cmnd *))
 
 	/* Only modify the allowed count if the target is a *non* tape device */
 	if ((fcport->flags & FCF_TAPE_PRESENT) == 0) {
+		sp->flags &= ~SRB_TAPE;
 		if (cmd->allowed < ql2xretrycount) {
 			cmd->allowed = ql2xretrycount;
 		}
-	}
+	} else
+		sp->flags |= SRB_TAPE;
+
 
 	DEBUG5(printk("scsi(%ld:%2d:%2d): (queuecmd) queue sp = %p, "
 	    "flags=0x%x fo retry=%d, pid=%ld\n",
@@ -821,7 +824,8 @@ qla2x00_queuecommand(struct scsi_cmnd *cmd, void (*fn)(struct scsi_cmnd *))
 		spin_lock_irq(ha->host->host_lock);
 		return (0);
 	}
-	if (tq && test_bit(TQF_SUSPENDED, &tq->flags)) {
+	if (tq && test_bit(TQF_SUSPENDED, &tq->flags) &&
+	    (sp->flags & SRB_TAPE) == 0) {
 		/* If target suspended put incoming I/O in retry_q. */
 		qla2x00_extend_timeout(sp->cmd, 10);
 		add_to_scsi_retry_queue(ha, sp);
@@ -3943,7 +3947,7 @@ qla2x00_cmd_timeout(srb_t *sp)
 	int processed;
 	scsi_qla_host_t *vis_ha, *dest_ha;
 	struct scsi_cmnd *cmd;
-	ulong      flags;
+	unsigned long flags, cpu_flags;
 	fc_port_t *fcport;
 
 	cmd = sp->cmd;
@@ -4039,6 +4043,64 @@ qla2x00_cmd_timeout(srb_t *sp)
 		 return;
 	}
 
+	spin_lock_irqsave(&dest_ha->list_lock, cpu_flags);
+	if (sp->state == SRB_DONE_STATE) {
+		/* IO in done_q  -- leave it */
+		DEBUG(printk("scsi(%ld): Found in Done queue pid %ld sp=%p.\n",
+		    dest_ha->host_no, cmd->serial_number, sp));
+	} else if (sp->state == SRB_SUSPENDED_STATE) {
+		DEBUG(printk("scsi(%ld): Found SP %p in suspended state  "
+		    "- pid %ld:\n",
+		    dest_ha->host_no, sp, cmd->serial_number));
+		DEBUG(qla2x00_dump_buffer((uint8_t *)sp, sizeof(srb_t));)
+	} else if (sp->state == SRB_ACTIVE_STATE) {
+		/*
+		 * IO is with ISP find the command in our active list.
+		 */
+		spin_unlock_irqrestore(&dest_ha->list_lock, cpu_flags);
+		spin_lock_irqsave(&dest_ha->hardware_lock, flags);
+		if (sp == dest_ha->outstanding_cmds[
+		    (unsigned long)sp->cmd->host_scribble]) {
+
+			DEBUG(printk("cmd_timeout: Found in ISP \n"));
+
+			if (sp->flags & SRB_TAPE) {
+				/*
+				 * We cannot allow the midlayer error handler
+				 * to wakeup and begin the abort process.
+				 * Extend the timer so that the firmware can
+				 * properly return the IOCB.
+				 */
+				DEBUG(printk("cmd_timeout: Extending timeout "
+				    "of FCP2 tape command!\n"));
+				qla2x00_extend_timeout(sp->cmd,
+				    EXTEND_CMD_TIMEOUT);
+			}
+			sp->state = SRB_ACTIVE_TIMEOUT_STATE;
+			spin_unlock_irqrestore(&dest_ha->hardware_lock, flags);
+		} else {
+			spin_unlock_irqrestore(&dest_ha->hardware_lock, flags);
+			printk(KERN_INFO 
+				"qla_cmd_timeout: State indicates it is with "
+				"ISP, But not in active array\n");
+		}
+		spin_lock_irqsave(&dest_ha->list_lock, cpu_flags);
+	} else if (sp->state == SRB_ACTIVE_TIMEOUT_STATE) {
+		DEBUG(printk("qla2100%ld: Found in Active timeout state"
+				"pid %ld, State = %x., \n",
+				dest_ha->host_no,
+				sp->cmd->serial_number, sp->state);)
+	} else {
+		/* EMPTY */
+		DEBUG2(printk("cmd_timeout%ld: LOST command state = "
+				"0x%x, sp=%p\n",
+				vis_ha->host_no, sp->state,sp);)
+
+		qla_printk(KERN_INFO, vis_ha,
+			"cmd_timeout: LOST command state = 0x%x\n", sp->state);
+	}
+	spin_unlock_irqrestore(&dest_ha->list_lock, cpu_flags);
+
 	DEBUG3(printk("cmd_timeout: Leaving\n");)
 }
 
@@ -4268,7 +4330,7 @@ qla2x00_next(scsi_qla_host_t *vis_ha)
 		 * continues until the LOOP DOWN time expires or the condition
 		 * goes away.
 		 */
-	 	if (!(sp->flags & SRB_IOCTL) &&
+		if (!(sp->flags & (SRB_IOCTL | SRB_TAPE)) &&
 		    (atomic_read(&fcport->state) != FCS_ONLINE ||
 			test_bit(ABORT_ISP_ACTIVE, &dest_ha->dpc_flags) ||
 			atomic_read(&dest_ha->loop_state) != LOOP_READY)) {
@@ -4293,7 +4355,7 @@ qla2x00_next(scsi_qla_host_t *vis_ha)
 		 * If this request's lun is suspended then put the request on
 		 * the  scsi_retry queue. 
 		 */
-	 	if (!(sp->flags & SRB_IOCTL) &&
+	 	if (!(sp->flags & (SRB_IOCTL | SRB_TAPE)) &&
 		    sp->lun_queue->q_state == LUN_STATE_WAIT) {
 			DEBUG3(printk("scsi(%ld): lun wait state - pid=%ld, "
 			    "opcode=%d, allowed=%d, retries=%d\n",