1 files changed, 356 insertions, 140 deletions

diff --git a/drivers/scsi/qla2xxx/qla_os.c b/drivers/scsi/qla2xxx/qla_os.c
index 567fa080e261..8521cfe302e9 100644
--- a/drivers/scsi/qla2xxx/qla_os.c
+++ b/drivers/scsi/qla2xxx/qla_os.c
@@ -13,6 +13,7 @@
 #include <linux/mutex.h>
 #include <linux/kobject.h>
 #include <linux/slab.h>
+#include <linux/blk-mq-pci.h>
 #include <scsi/scsi_tcq.h>
 #include <scsi/scsicam.h>
 #include <scsi/scsi_transport.h>
@@ -30,7 +31,7 @@ static int apidev_major;
 /*
  * SRB allocation cache
  */
-static struct kmem_cache *srb_cachep;
+struct kmem_cache *srb_cachep;
 
 /*
  * CT6 CTX allocation cache
@@ -143,19 +144,12 @@ MODULE_PARM_DESC(ql2xiidmaenable,
 		"Enables iIDMA settings "
 		"Default is 1 - perform iIDMA. 0 - no iIDMA.");
 
-int ql2xmaxqueues = 1;
-module_param(ql2xmaxqueues, int, S_IRUGO);
-MODULE_PARM_DESC(ql2xmaxqueues,
-		"Enables MQ settings "
-		"Default is 1 for single queue. Set it to number "
-		"of queues in MQ mode.");
-
-int ql2xmultique_tag;
-module_param(ql2xmultique_tag, int, S_IRUGO);
-MODULE_PARM_DESC(ql2xmultique_tag,
-		"Enables CPU affinity settings for the driver "
-		"Default is 0 for no affinity of request and response IO. "
-		"Set it to 1 to turn on the cpu affinity.");
+int ql2xmqsupport = 1;
+module_param(ql2xmqsupport, int, S_IRUGO);
+MODULE_PARM_DESC(ql2xmqsupport,
+		"Enable on demand multiple queue pairs support "
+		"Default is 1 for supported. "
+		"Set it to 0 to turn off mq qpair support.");
 
 int ql2xfwloadbin;
 module_param(ql2xfwloadbin, int, S_IRUGO|S_IWUSR);
@@ -261,6 +255,7 @@ static int qla2xxx_eh_host_reset(struct scsi_cmnd *);
 static void qla2x00_clear_drv_active(struct qla_hw_data *);
 static void qla2x00_free_device(scsi_qla_host_t *);
 static void qla83xx_disable_laser(scsi_qla_host_t *vha);
+static int qla2xxx_map_queues(struct Scsi_Host *shost);
 
 struct scsi_host_template qla2xxx_driver_template = {
 	.module			= THIS_MODULE,
@@ -280,6 +275,7 @@ struct scsi_host_template qla2xxx_driver_template = {
 	.scan_finished		= qla2xxx_scan_finished,
 	.scan_start		= qla2xxx_scan_start,
 	.change_queue_depth	= scsi_change_queue_depth,
+	.map_queues             = qla2xxx_map_queues,
 	.this_id		= -1,
 	.cmd_per_lun		= 3,
 	.use_clustering		= ENABLE_CLUSTERING,
@@ -339,6 +335,8 @@ static int qla2x00_mem_alloc(struct qla_hw_data *, uint16_t, uint16_t,
 	struct req_que **, struct rsp_que **);
 static void qla2x00_free_fw_dump(struct qla_hw_data *);
 static void qla2x00_mem_free(struct qla_hw_data *);
+int qla2xxx_mqueuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd,
+	struct qla_qpair *qpair);
 
 /* -------------------------------------------------------------------------- */
 static int qla2x00_alloc_queues(struct qla_hw_data *ha, struct req_que *req,
@@ -360,6 +358,25 @@ static int qla2x00_alloc_queues(struct qla_hw_data *ha, struct req_que *req,
 		    "Unable to allocate memory for response queue ptrs.\n");
 		goto fail_rsp_map;
 	}
+
+	if (ql2xmqsupport && ha->max_qpairs) {
+		ha->queue_pair_map = kcalloc(ha->max_qpairs, sizeof(struct qla_qpair *),
+			GFP_KERNEL);
+		if (!ha->queue_pair_map) {
+			ql_log(ql_log_fatal, vha, 0x0180,
+			    "Unable to allocate memory for queue pair ptrs.\n");
+			goto fail_qpair_map;
+		}
+		ha->base_qpair = kzalloc(sizeof(struct qla_qpair), GFP_KERNEL);
+		if (ha->base_qpair == NULL) {
+			ql_log(ql_log_warn, vha, 0x0182,
+			    "Failed to allocate base queue pair memory.\n");
+			goto fail_base_qpair;
+		}
+		ha->base_qpair->req = req;
+		ha->base_qpair->rsp = rsp;
+	}
+
 	/*
 	 * Make sure we record at least the request and response queue zero in
 	 * case we need to free them if part of the probe fails.
@@ -370,6 +387,11 @@ static int qla2x00_alloc_queues(struct qla_hw_data *ha, struct req_que *req,
 	set_bit(0, ha->req_qid_map);
 	return 1;
 
+fail_base_qpair:
+	kfree(ha->queue_pair_map);
+fail_qpair_map:
+	kfree(ha->rsp_q_map);
+	ha->rsp_q_map = NULL;
 fail_rsp_map:
 	kfree(ha->req_q_map);
 	ha->req_q_map = NULL;
@@ -417,82 +439,43 @@ static void qla2x00_free_queues(struct qla_hw_data *ha)
 	struct req_que *req;
 	struct rsp_que *rsp;
 	int cnt;
+	unsigned long flags;
 
+	spin_lock_irqsave(&ha->hardware_lock, flags);
 	for (cnt = 0; cnt < ha->max_req_queues; cnt++) {
 		if (!test_bit(cnt, ha->req_qid_map))
 			continue;
 
 		req = ha->req_q_map[cnt];
+		clear_bit(cnt, ha->req_qid_map);
+		ha->req_q_map[cnt] = NULL;
+
+		spin_unlock_irqrestore(&ha->hardware_lock, flags);
 		qla2x00_free_req_que(ha, req);
+		spin_lock_irqsave(&ha->hardware_lock, flags);
 	}
+	spin_unlock_irqrestore(&ha->hardware_lock, flags);
+
 	kfree(ha->req_q_map);
 	ha->req_q_map = NULL;
 
+
+	spin_lock_irqsave(&ha->hardware_lock, flags);
 	for (cnt = 0; cnt < ha->max_rsp_queues; cnt++) {
 		if (!test_bit(cnt, ha->rsp_qid_map))
 			continue;
 
 		rsp = ha->rsp_q_map[cnt];
+		clear_bit(cnt, ha->req_qid_map);
+		ha->rsp_q_map[cnt] =  NULL;
+		spin_unlock_irqrestore(&ha->hardware_lock, flags);
 		qla2x00_free_rsp_que(ha, rsp);
+		spin_lock_irqsave(&ha->hardware_lock, flags);
 	}
-	kfree(ha->rsp_q_map);
-	ha->rsp_q_map = NULL;
-}
-
-static int qla25xx_setup_mode(struct scsi_qla_host *vha)
-{
-	uint16_t options = 0;
-	int ques, req, ret;
-	struct qla_hw_data *ha = vha->hw;
+	spin_unlock_irqrestore(&ha->hardware_lock, flags);
 
-	if (!(ha->fw_attributes & BIT_6)) {
-		ql_log(ql_log_warn, vha, 0x00d8,
-		    "Firmware is not multi-queue capable.\n");
-		goto fail;
-	}
-	if (ql2xmultique_tag) {
-		/* create a request queue for IO */
-		options |= BIT_7;
-		req = qla25xx_create_req_que(ha, options, 0, 0, -1,
-			QLA_DEFAULT_QUE_QOS);
-		if (!req) {
-			ql_log(ql_log_warn, vha, 0x00e0,
-			    "Failed to create request queue.\n");
-			goto fail;
-		}
-		ha->wq = alloc_workqueue("qla2xxx_wq", WQ_MEM_RECLAIM, 1);
-		vha->req = ha->req_q_map[req];
-		options |= BIT_1;
-		for (ques = 1; ques < ha->max_rsp_queues; ques++) {
-			ret = qla25xx_create_rsp_que(ha, options, 0, 0, req);
-			if (!ret) {
-				ql_log(ql_log_warn, vha, 0x00e8,
-				    "Failed to create response queue.\n");
-				goto fail2;
-			}
-		}
-		ha->flags.cpu_affinity_enabled = 1;
-		ql_dbg(ql_dbg_multiq, vha, 0xc007,
-		    "CPU affinity mode enabled, "
-		    "no. of response queues:%d no. of request queues:%d.\n",
-		    ha->max_rsp_queues, ha->max_req_queues);
-		ql_dbg(ql_dbg_init, vha, 0x00e9,
-		    "CPU affinity mode enabled, "
-		    "no. of response queues:%d no. of request queues:%d.\n",
-		    ha->max_rsp_queues, ha->max_req_queues);
-	}
-	return 0;
-fail2:
-	qla25xx_delete_queues(vha);
-	destroy_workqueue(ha->wq);
-	ha->wq = NULL;
-	vha->req = ha->req_q_map[0];
-fail:
-	ha->mqenable = 0;
-	kfree(ha->req_q_map);
 	kfree(ha->rsp_q_map);
-	ha->max_req_queues = ha->max_rsp_queues = 1;
-	return 1;
+	ha->rsp_q_map = NULL;
 }
 
 static char *
@@ -669,7 +652,7 @@ qla2x00_sp_free_dma(void *vha, void *ptr)
 	qla2x00_rel_sp(sp->fcport->vha, sp);
 }
 
-static void
+void
 qla2x00_sp_compl(void *data, void *ptr, int res)
 {
 	struct qla_hw_data *ha = (struct qla_hw_data *)data;
@@ -693,6 +676,75 @@ qla2x00_sp_compl(void *data, void *ptr, int res)
 	cmd->scsi_done(cmd);
 }
 
+void
+qla2xxx_qpair_sp_free_dma(void *vha, void *ptr)
+{
+	srb_t *sp = (srb_t *)ptr;
+	struct scsi_cmnd *cmd = GET_CMD_SP(sp);
+	struct qla_hw_data *ha = sp->fcport->vha->hw;
+	void *ctx = GET_CMD_CTX_SP(sp);
+
+	if (sp->flags & SRB_DMA_VALID) {
+		scsi_dma_unmap(cmd);
+		sp->flags &= ~SRB_DMA_VALID;
+	}
+
+	if (sp->flags & SRB_CRC_PROT_DMA_VALID) {
+		dma_unmap_sg(&ha->pdev->dev, scsi_prot_sglist(cmd),
+		    scsi_prot_sg_count(cmd), cmd->sc_data_direction);
+		sp->flags &= ~SRB_CRC_PROT_DMA_VALID;
+	}
+
+	if (sp->flags & SRB_CRC_CTX_DSD_VALID) {
+		/* List assured to be having elements */
+		qla2x00_clean_dsd_pool(ha, sp, NULL);
+		sp->flags &= ~SRB_CRC_CTX_DSD_VALID;
+	}
+
+	if (sp->flags & SRB_CRC_CTX_DMA_VALID) {
+		dma_pool_free(ha->dl_dma_pool, ctx,
+		    ((struct crc_context *)ctx)->crc_ctx_dma);
+		sp->flags &= ~SRB_CRC_CTX_DMA_VALID;
+	}
+
+	if (sp->flags & SRB_FCP_CMND_DMA_VALID) {
+		struct ct6_dsd *ctx1 = (struct ct6_dsd *)ctx;
+
+		dma_pool_free(ha->fcp_cmnd_dma_pool, ctx1->fcp_cmnd,
+		    ctx1->fcp_cmnd_dma);
+		list_splice(&ctx1->dsd_list, &ha->gbl_dsd_list);
+		ha->gbl_dsd_inuse -= ctx1->dsd_use_cnt;
+		ha->gbl_dsd_avail += ctx1->dsd_use_cnt;
+		mempool_free(ctx1, ha->ctx_mempool);
+	}
+
+	CMD_SP(cmd) = NULL;
+	qla2xxx_rel_qpair_sp(sp->qpair, sp);
+}
+
+void
+qla2xxx_qpair_sp_compl(void *data, void *ptr, int res)
+{
+	srb_t *sp = (srb_t *)ptr;
+	struct scsi_cmnd *cmd = GET_CMD_SP(sp);
+
+	cmd->result = res;
+
+	if (atomic_read(&sp->ref_count) == 0) {
+		ql_dbg(ql_dbg_io, sp->fcport->vha, 0x3079,
+		    "SP reference-count to ZERO -- sp=%p cmd=%p.\n",
+		    sp, GET_CMD_SP(sp));
+		if (ql2xextended_error_logging & ql_dbg_io)
+			WARN_ON(atomic_read(&sp->ref_count) == 0);
+		return;
+	}
+	if (!atomic_dec_and_test(&sp->ref_count))
+		return;
+
+	qla2xxx_qpair_sp_free_dma(sp->fcport->vha, sp);
+	cmd->scsi_done(cmd);
+}
+
 /* If we are SP1 here, we need to still take and release the host_lock as SP1
  * does not have the changes necessary to avoid taking host->host_lock.
  */
@@ -706,12 +758,28 @@ qla2xxx_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd)
 	struct scsi_qla_host *base_vha = pci_get_drvdata(ha->pdev);
 	srb_t *sp;
 	int rval;
+	struct qla_qpair *qpair = NULL;
+	uint32_t tag;
+	uint16_t hwq;
 
 	if (unlikely(test_bit(UNLOADING, &base_vha->dpc_flags))) {
 		cmd->result = DID_NO_CONNECT << 16;
 		goto qc24_fail_command;
 	}
 
+	if (ha->mqenable) {
+		if (shost_use_blk_mq(vha->host)) {
+			tag = blk_mq_unique_tag(cmd->request);
+			hwq = blk_mq_unique_tag_to_hwq(tag);
+			qpair = ha->queue_pair_map[hwq];
+		} else if (vha->vp_idx && vha->qpair) {
+			qpair = vha->qpair;
+		}
+
+		if (qpair)
+			return qla2xxx_mqueuecommand(host, cmd, qpair);
+	}
+
 	if (ha->flags.eeh_busy) {
 		if (ha->flags.pci_channel_io_perm_failure) {
 			ql_dbg(ql_dbg_aer, vha, 0x9010,
@@ -808,6 +876,95 @@ qc24_fail_command:
 	return 0;
 }
 
+/* For MQ supported I/O */
+int
+qla2xxx_mqueuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd,
+    struct qla_qpair *qpair)
+{
+	scsi_qla_host_t *vha = shost_priv(host);
+	fc_port_t *fcport = (struct fc_port *) cmd->device->hostdata;
+	struct fc_rport *rport = starget_to_rport(scsi_target(cmd->device));
+	struct qla_hw_data *ha = vha->hw;
+	struct scsi_qla_host *base_vha = pci_get_drvdata(ha->pdev);
+	srb_t *sp;
+	int rval;
+
+	rval = fc_remote_port_chkready(rport);
+	if (rval) {
+		cmd->result = rval;
+		ql_dbg(ql_dbg_io + ql_dbg_verbose, vha, 0x3076,
+		    "fc_remote_port_chkready failed for cmd=%p, rval=0x%x.\n",
+		    cmd, rval);
+		goto qc24_fail_command;
+	}
+
+	if (!fcport) {
+		cmd->result = DID_NO_CONNECT << 16;
+		goto qc24_fail_command;
+	}
+
+	if (atomic_read(&fcport->state) != FCS_ONLINE) {
+		if (atomic_read(&fcport->state) == FCS_DEVICE_DEAD ||
+			atomic_read(&base_vha->loop_state) == LOOP_DEAD) {
+			ql_dbg(ql_dbg_io, vha, 0x3077,
+			    "Returning DNC, fcport_state=%d loop_state=%d.\n",
+			    atomic_read(&fcport->state),
+			    atomic_read(&base_vha->loop_state));
+			cmd->result = DID_NO_CONNECT << 16;
+			goto qc24_fail_command;
+		}
+		goto qc24_target_busy;
+	}
+
+	/*
+	 * Return target busy if we've received a non-zero retry_delay_timer
+	 * in a FCP_RSP.
+	 */
+	if (fcport->retry_delay_timestamp == 0) {
+		/* retry delay not set */
+	} else if (time_after(jiffies, fcport->retry_delay_timestamp))
+		fcport->retry_delay_timestamp = 0;
+	else
+		goto qc24_target_busy;
+
+	sp = qla2xxx_get_qpair_sp(qpair, fcport, GFP_ATOMIC);
+	if (!sp)
+		goto qc24_host_busy;
+
+	sp->u.scmd.cmd = cmd;
+	sp->type = SRB_SCSI_CMD;
+	atomic_set(&sp->ref_count, 1);
+	CMD_SP(cmd) = (void *)sp;
+	sp->free = qla2xxx_qpair_sp_free_dma;
+	sp->done = qla2xxx_qpair_sp_compl;
+	sp->qpair = qpair;
+
+	rval = ha->isp_ops->start_scsi_mq(sp);
+	if (rval != QLA_SUCCESS) {
+		ql_dbg(ql_dbg_io + ql_dbg_verbose, vha, 0x3078,
+		    "Start scsi failed rval=%d for cmd=%p.\n", rval, cmd);
+		if (rval == QLA_INTERFACE_ERROR)
+			goto qc24_fail_command;
+		goto qc24_host_busy_free_sp;
+	}
+
+	return 0;
+
+qc24_host_busy_free_sp:
+	qla2xxx_qpair_sp_free_dma(vha, sp);
+
+qc24_host_busy:
+	return SCSI_MLQUEUE_HOST_BUSY;
+
+qc24_target_busy:
+	return SCSI_MLQUEUE_TARGET_BUSY;
+
+qc24_fail_command:
+	cmd->scsi_done(cmd);
+
+	return 0;
+}
+
 /*
  * qla2x00_eh_wait_on_command
  *    Waits for the command to be returned by the Firmware for some
@@ -1456,15 +1613,20 @@ qla2x00_abort_all_cmds(scsi_qla_host_t *vha, int res)
 		for (cnt = 1; cnt < req->num_outstanding_cmds; cnt++) {
 			sp = req->outstanding_cmds[cnt];
 			if (sp) {
-				/* Get a reference to the sp and drop the lock.
-				 * The reference ensures this sp->done() call
-				 * - and not the call in qla2xxx_eh_abort() -
-				 * ends the SCSI command (with result 'res').
+				/* Don't abort commands in adapter during EEH
+				 * recovery as it's not accessible/responding.
 				 */
-				sp_get(sp);
-				spin_unlock_irqrestore(&ha->hardware_lock, flags);
-				qla2xxx_eh_abort(GET_CMD_SP(sp));
-				spin_lock_irqsave(&ha->hardware_lock, flags);
+				if (!ha->flags.eeh_busy) {
+					/* Get a reference to the sp and drop the lock.
+					 * The reference ensures this sp->done() call
+					 * - and not the call in qla2xxx_eh_abort() -
+					 * ends the SCSI command (with result 'res').
+					 */
+					sp_get(sp);
+					spin_unlock_irqrestore(&ha->hardware_lock, flags);
+					qla2xxx_eh_abort(GET_CMD_SP(sp));
+					spin_lock_irqsave(&ha->hardware_lock, flags);
+				}
 				req->outstanding_cmds[cnt] = NULL;
 				sp->done(vha, sp, res);
 			}
@@ -1596,7 +1758,6 @@ qla2x00_iospace_config(struct qla_hw_data *ha)
 {
 	resource_size_t pio;
 	uint16_t msix;
-	int cpus;
 
 	if (pci_request_selected_regions(ha->pdev, ha->bars,
 	    QLA2XXX_DRIVER_NAME)) {
@@ -1653,9 +1814,7 @@ skip_pio:
 
 	/* Determine queue resources */
 	ha->max_req_queues = ha->max_rsp_queues = 1;
-	if ((ql2xmaxqueues <= 1 && !ql2xmultique_tag) ||
-		(ql2xmaxqueues > 1 && ql2xmultique_tag) ||
-		(!IS_QLA25XX(ha) && !IS_QLA81XX(ha)))
+	if (!ql2xmqsupport || (!IS_QLA25XX(ha) && !IS_QLA81XX(ha)))
 		goto mqiobase_exit;
 
 	ha->mqiobase = ioremap(pci_resource_start(ha->pdev, 3),
@@ -1665,26 +1824,18 @@ skip_pio:
 		    "MQIO Base=%p.\n", ha->mqiobase);
 		/* Read MSIX vector size of the board */
 		pci_read_config_word(ha->pdev, QLA_PCI_MSIX_CONTROL, &msix);
-		ha->msix_count = msix;
+		ha->msix_count = msix + 1;
 		/* Max queues are bounded by available msix vectors */
-		/* queue 0 uses two msix vectors */
-		if (ql2xmultique_tag) {
-			cpus = num_online_cpus();
-			ha->max_rsp_queues = (ha->msix_count - 1 > cpus) ?
-				(cpus + 1) : (ha->msix_count - 1);
-			ha->max_req_queues = 2;
-		} else if (ql2xmaxqueues > 1) {
-			ha->max_req_queues = ql2xmaxqueues > QLA_MQ_SIZE ?
-			    QLA_MQ_SIZE : ql2xmaxqueues;
-			ql_dbg_pci(ql_dbg_multiq, ha->pdev, 0xc008,
-			    "QoS mode set, max no of request queues:%d.\n",
-			    ha->max_req_queues);
-			ql_dbg_pci(ql_dbg_init, ha->pdev, 0x0019,
-			    "QoS mode set, max no of request queues:%d.\n",
-			    ha->max_req_queues);
-		}
+		/* MB interrupt uses 1 vector */
+		ha->max_req_queues = ha->msix_count - 1;
+		ha->max_rsp_queues = ha->max_req_queues;
+		/* Queue pairs is the max value minus the base queue pair */
+		ha->max_qpairs = ha->max_rsp_queues - 1;
+		ql_dbg_pci(ql_dbg_init, ha->pdev, 0x0188,
+		    "Max no of queues pairs: %d.\n", ha->max_qpairs);
+
 		ql_log_pci(ql_log_info, ha->pdev, 0x001a,
-		    "MSI-X vector count: %d.\n", msix);
+		    "MSI-X vector count: %d.\n", ha->msix_count);
 	} else
 		ql_log_pci(ql_log_info, ha->pdev, 0x001b,
 		    "BAR 3 not enabled.\n");
@@ -1704,7 +1855,6 @@ static int
 qla83xx_iospace_config(struct qla_hw_data *ha)
 {
 	uint16_t msix;
-	int cpus;
 
 	if (pci_request_selected_regions(ha->pdev, ha->bars,
 	    QLA2XXX_DRIVER_NAME)) {
@@ -1756,32 +1906,36 @@ qla83xx_iospace_config(struct qla_hw_data *ha)
 		/* Read MSIX vector size of the board */
 		pci_read_config_word(ha->pdev,
 		    QLA_83XX_PCI_MSIX_CONTROL, &msix);
-		ha->msix_count = msix;
-		/* Max queues are bounded by available msix vectors */
-		/* queue 0 uses two msix vectors */
-		if (ql2xmultique_tag) {
-			cpus = num_online_cpus();
-			ha->max_rsp_queues = (ha->msix_count - 1 > cpus) ?
-				(cpus + 1) : (ha->msix_count - 1);
-			ha->max_req_queues = 2;
-		} else if (ql2xmaxqueues > 1) {
-			ha->max_req_queues = ql2xmaxqueues > QLA_MQ_SIZE ?
-						QLA_MQ_SIZE : ql2xmaxqueues;
-			ql_dbg_pci(ql_dbg_multiq, ha->pdev, 0xc00c,
-			    "QoS mode set, max no of request queues:%d.\n",
-			    ha->max_req_queues);
-			ql_dbg_pci(ql_dbg_init, ha->pdev, 0x011b,
-			    "QoS mode set, max no of request queues:%d.\n",
-			    ha->max_req_queues);
+		ha->msix_count = msix + 1;
+		/*
+		 * By default, driver uses at least two msix vectors
+		 * (default & rspq)
+		 */
+		if (ql2xmqsupport) {
+			/* MB interrupt uses 1 vector */
+			ha->max_req_queues = ha->msix_count - 1;
+			ha->max_rsp_queues = ha->max_req_queues;
+
+			/* ATIOQ needs 1 vector. That's 1 less QPair */
+			if (QLA_TGT_MODE_ENABLED())
+				ha->max_req_queues--;
+
+			/* Queue pairs is the max value minus
+			 * the base queue pair */
+			ha->max_qpairs = ha->max_req_queues - 1;
+			ql_dbg_pci(ql_dbg_init, ha->pdev, 0x0190,
+			    "Max no of queues pairs: %d.\n", ha->max_qpairs);
 		}
 		ql_log_pci(ql_log_info, ha->pdev, 0x011c,
-		    "MSI-X vector count: %d.\n", msix);
+		    "MSI-X vector count: %d.\n", ha->msix_count);
 	} else
 		ql_log_pci(ql_log_info, ha->pdev, 0x011e,
 		    "BAR 1 not enabled.\n");
 
 mqiobase_exit:
 	ha->msix_count = ha->max_rsp_queues + 1;
+	if (QLA_TGT_MODE_ENABLED())
+		ha->msix_count++;
 
 	qlt_83xx_iospace_config(ha);
 
@@ -1826,6 +1980,7 @@ static struct isp_operations qla2100_isp_ops = {
 	.write_optrom		= qla2x00_write_optrom_data,
 	.get_flash_version	= qla2x00_get_flash_version,
 	.start_scsi		= qla2x00_start_scsi,
+	.start_scsi_mq          = NULL,
 	.abort_isp		= qla2x00_abort_isp,
 	.iospace_config     	= qla2x00_iospace_config,
 	.initialize_adapter	= qla2x00_initialize_adapter,
@@ -1864,6 +2019,7 @@ static struct isp_operations qla2300_isp_ops = {
 	.write_optrom		= qla2x00_write_optrom_data,
 	.get_flash_version	= qla2x00_get_flash_version,
 	.start_scsi		= qla2x00_start_scsi,
+	.start_scsi_mq          = NULL,
 	.abort_isp		= qla2x00_abort_isp,
 	.iospace_config		= qla2x00_iospace_config,
 	.initialize_adapter	= qla2x00_initialize_adapter,
@@ -1902,6 +2058,7 @@ static struct isp_operations qla24xx_isp_ops = {
 	.write_optrom		= qla24xx_write_optrom_data,
 	.get_flash_version	= qla24xx_get_flash_version,
 	.start_scsi		= qla24xx_start_scsi,
+	.start_scsi_mq          = NULL,
 	.abort_isp		= qla2x00_abort_isp,
 	.iospace_config		= qla2x00_iospace_config,
 	.initialize_adapter	= qla2x00_initialize_adapter,
@@ -1940,6 +2097,7 @@ static struct isp_operations qla25xx_isp_ops = {
 	.write_optrom		= qla24xx_write_optrom_data,
 	.get_flash_version	= qla24xx_get_flash_version,
 	.start_scsi		= qla24xx_dif_start_scsi,
+	.start_scsi_mq          = qla2xxx_dif_start_scsi_mq,
 	.abort_isp		= qla2x00_abort_isp,
 	.iospace_config		= qla2x00_iospace_config,
 	.initialize_adapter	= qla2x00_initialize_adapter,
@@ -1978,6 +2136,7 @@ static struct isp_operations qla81xx_isp_ops = {
 	.write_optrom		= qla24xx_write_optrom_data,
 	.get_flash_version	= qla24xx_get_flash_version,
 	.start_scsi		= qla24xx_dif_start_scsi,
+	.start_scsi_mq          = qla2xxx_dif_start_scsi_mq,
 	.abort_isp		= qla2x00_abort_isp,
 	.iospace_config		= qla2x00_iospace_config,
 	.initialize_adapter	= qla2x00_initialize_adapter,
@@ -2016,6 +2175,7 @@ static struct isp_operations qla82xx_isp_ops = {
 	.write_optrom		= qla82xx_write_optrom_data,
 	.get_flash_version	= qla82xx_get_flash_version,
 	.start_scsi             = qla82xx_start_scsi,
+	.start_scsi_mq          = NULL,
 	.abort_isp		= qla82xx_abort_isp,
 	.iospace_config     	= qla82xx_iospace_config,
 	.initialize_adapter	= qla2x00_initialize_adapter,
@@ -2054,6 +2214,7 @@ static struct isp_operations qla8044_isp_ops = {
 	.write_optrom		= qla8044_write_optrom_data,
 	.get_flash_version	= qla82xx_get_flash_version,
 	.start_scsi             = qla82xx_start_scsi,
+	.start_scsi_mq          = NULL,
 	.abort_isp		= qla8044_abort_isp,
 	.iospace_config		= qla82xx_iospace_config,
 	.initialize_adapter	= qla2x00_initialize_adapter,
@@ -2092,6 +2253,7 @@ static struct isp_operations qla83xx_isp_ops = {
 	.write_optrom		= qla24xx_write_optrom_data,
 	.get_flash_version	= qla24xx_get_flash_version,
 	.start_scsi		= qla24xx_dif_start_scsi,
+	.start_scsi_mq          = qla2xxx_dif_start_scsi_mq,
 	.abort_isp		= qla2x00_abort_isp,
 	.iospace_config		= qla83xx_iospace_config,
 	.initialize_adapter	= qla2x00_initialize_adapter,
@@ -2130,6 +2292,7 @@ static struct isp_operations qlafx00_isp_ops = {
 	.write_optrom		= qla24xx_write_optrom_data,
 	.get_flash_version	= qla24xx_get_flash_version,
 	.start_scsi		= qlafx00_start_scsi,
+	.start_scsi_mq          = NULL,
 	.abort_isp		= qlafx00_abort_isp,
 	.iospace_config		= qlafx00_iospace_config,
 	.initialize_adapter	= qlafx00_initialize_adapter,
@@ -2168,6 +2331,7 @@ static struct isp_operations qla27xx_isp_ops = {
 	.write_optrom		= qla24xx_write_optrom_data,
 	.get_flash_version	= qla24xx_get_flash_version,
 	.start_scsi		= qla24xx_dif_start_scsi,
+	.start_scsi_mq          = qla2xxx_dif_start_scsi_mq,
 	.abort_isp		= qla2x00_abort_isp,
 	.iospace_config		= qla83xx_iospace_config,
 	.initialize_adapter	= qla2x00_initialize_adapter,
@@ -2382,6 +2546,8 @@ qla2x00_probe_one(struct pci_dev *pdev, const struct pci_device_id *id)
 	uint16_t req_length = 0, rsp_length = 0;
 	struct req_que *req = NULL;
 	struct rsp_que *rsp = NULL;
+	int i;
+
 	bars = pci_select_bars(pdev, IORESOURCE_MEM | IORESOURCE_IO);
 	sht = &qla2xxx_driver_template;
 	if (pdev->device == PCI_DEVICE_ID_QLOGIC_ISP2422 ||
@@ -2645,6 +2811,7 @@ qla2x00_probe_one(struct pci_dev *pdev, const struct pci_device_id *id)
 	    "Found an ISP%04X irq %d iobase 0x%p.\n",
 	    pdev->device, pdev->irq, ha->iobase);
 	mutex_init(&ha->vport_lock);
+	mutex_init(&ha->mq_lock);
 	init_completion(&ha->mbx_cmd_comp);
 	complete(&ha->mbx_cmd_comp);
 	init_completion(&ha->mbx_intr_comp);
@@ -2732,7 +2899,11 @@ qla2x00_probe_one(struct pci_dev *pdev, const struct pci_device_id *id)
 	    host->max_cmd_len, host->max_channel, host->max_lun,
 	    host->transportt, sht->vendor_id);
 
-que_init:
+	/* Set up the irqs */
+	ret = qla2x00_request_irqs(ha, rsp);
+	if (ret)
+		goto probe_init_failed;
+
 	/* Alloc arrays of request and response ring ptrs */
 	if (!qla2x00_alloc_queues(ha, req, rsp)) {
 		ql_log(ql_log_fatal, base_vha, 0x003d,
@@ -2741,12 +2912,17 @@ que_init:
 		goto probe_init_failed;
 	}
 
-	qlt_probe_one_stage1(base_vha, ha);
+	if (ha->mqenable && shost_use_blk_mq(host)) {
+		/* number of hardware queues supported by blk/scsi-mq*/
+		host->nr_hw_queues = ha->max_qpairs;
 
-	/* Set up the irqs */
-	ret = qla2x00_request_irqs(ha, rsp);
-	if (ret)
-		goto probe_init_failed;
+		ql_dbg(ql_dbg_init, base_vha, 0x0192,
+			"blk/scsi-mq enabled, HW queues = %d.\n", host->nr_hw_queues);
+	} else
+		ql_dbg(ql_dbg_init, base_vha, 0x0193,
+			"blk/scsi-mq disabled.\n");
+
+	qlt_probe_one_stage1(base_vha, ha);
 
 	pci_save_state(pdev);
 
@@ -2837,11 +3013,12 @@ que_init:
 	    host->can_queue, base_vha->req,
 	    base_vha->mgmt_svr_loop_id, host->sg_tablesize);
 
-	if (ha->mqenable) {
-		if (qla25xx_setup_mode(base_vha)) {
-			ql_log(ql_log_warn, base_vha, 0x00ec,
-			    "Failed to create queues, falling back to single queue mode.\n");
-			goto que_init;
+	if (ha->mqenable && qla_ini_mode_enabled(base_vha)) {
+		ha->wq = alloc_workqueue("qla2xxx_wq", WQ_MEM_RECLAIM, 1);
+		/* Create start of day qpairs for Block MQ */
+		if (shost_use_blk_mq(host)) {
+			for (i = 0; i < ha->max_qpairs; i++)
+				qla2xxx_create_qpair(base_vha, 5, 0);
 		}
 	}
 
@@ -3110,13 +3287,6 @@ qla2x00_delete_all_vps(struct qla_hw_data *ha, scsi_qla_host_t *base_vha)
 static void
 qla2x00_destroy_deferred_work(struct qla_hw_data *ha)
 {
-	/* Flush the work queue and remove it */
-	if (ha->wq) {
-		flush_workqueue(ha->wq);
-		destroy_workqueue(ha->wq);
-		ha->wq = NULL;
-	}
-
 	/* Cancel all work and destroy DPC workqueues */
 	if (ha->dpc_lp_wq) {
 		cancel_work_sync(&ha->idc_aen);
@@ -3312,9 +3482,17 @@ qla2x00_free_device(scsi_qla_host_t *vha)
 		ha->isp_ops->disable_intrs(ha);
 	}
 
+	qla2x00_free_fcports(vha);
+
 	qla2x00_free_irqs(vha);
 
-	qla2x00_free_fcports(vha);
+	/* Flush the work queue and remove it */
+	if (ha->wq) {
+		flush_workqueue(ha->wq);
+		destroy_workqueue(ha->wq);
+		ha->wq = NULL;
+	}
+
 
 	qla2x00_mem_free(ha);
 
@@ -4029,6 +4207,7 @@ struct scsi_qla_host *qla2x00_create_host(struct scsi_host_template *sht,
 	INIT_LIST_HEAD(&vha->qla_sess_op_cmd_list);
 	INIT_LIST_HEAD(&vha->logo_list);
 	INIT_LIST_HEAD(&vha->plogi_ack_list);
+	INIT_LIST_HEAD(&vha->qp_list);
 
 	spin_lock_init(&vha->work_lock);
 	spin_lock_init(&vha->cmd_list_lock);
@@ -5033,8 +5212,8 @@ qla2x00_disable_board_on_pci_error(struct work_struct *work)
 
 	base_vha->flags.init_done = 0;
 	qla25xx_delete_queues(base_vha);
-	qla2x00_free_irqs(base_vha);
 	qla2x00_free_fcports(base_vha);
+	qla2x00_free_irqs(base_vha);
 	qla2x00_mem_free(ha);
 	qla82xx_md_free(base_vha);
 	qla2x00_free_queues(ha);
@@ -5068,6 +5247,8 @@ qla2x00_do_dpc(void *data)
 {
 	scsi_qla_host_t *base_vha;
 	struct qla_hw_data *ha;
+	uint32_t online;
+	struct qla_qpair *qpair;
 
 	ha = (struct qla_hw_data *)data;
 	base_vha = pci_get_drvdata(ha->pdev);
@@ -5329,6 +5510,22 @@ intr_on_check:
 				ha->isp_ops->beacon_blink(base_vha);
 		}
 
+		/* qpair online check */
+		if (test_and_clear_bit(QPAIR_ONLINE_CHECK_NEEDED,
+		    &base_vha->dpc_flags)) {
+			if (ha->flags.eeh_busy ||
+			    ha->flags.pci_channel_io_perm_failure)
+				online = 0;
+			else
+				online = 1;
+
+			mutex_lock(&ha->mq_lock);
+			list_for_each_entry(qpair, &base_vha->qp_list,
+			    qp_list_elem)
+			qpair->online = online;
+			mutex_unlock(&ha->mq_lock);
+		}
+
 		if (!IS_QLAFX00(ha))
 			qla2x00_do_dpc_all_vps(base_vha);
 
@@ -5671,6 +5868,10 @@ qla2xxx_pci_error_detected(struct pci_dev *pdev, pci_channel_state_t state)
 	switch (state) {
 	case pci_channel_io_normal:
 		ha->flags.eeh_busy = 0;
+		if (ql2xmqsupport) {
+			set_bit(QPAIR_ONLINE_CHECK_NEEDED, &vha->dpc_flags);
+			qla2xxx_wake_dpc(vha);
+		}
 		return PCI_ERS_RESULT_CAN_RECOVER;
 	case pci_channel_io_frozen:
 		ha->flags.eeh_busy = 1;
@@ -5684,10 +5885,18 @@ qla2xxx_pci_error_detected(struct pci_dev *pdev, pci_channel_state_t state)
 		pci_disable_device(pdev);
 		/* Return back all IOs */
 		qla2x00_abort_all_cmds(vha, DID_RESET << 16);
+		if (ql2xmqsupport) {
+			set_bit(QPAIR_ONLINE_CHECK_NEEDED, &vha->dpc_flags);
+			qla2xxx_wake_dpc(vha);
+		}
 		return PCI_ERS_RESULT_NEED_RESET;
 	case pci_channel_io_perm_failure:
 		ha->flags.pci_channel_io_perm_failure = 1;
 		qla2x00_abort_all_cmds(vha, DID_NO_CONNECT << 16);
+		if (ql2xmqsupport) {
+			set_bit(QPAIR_ONLINE_CHECK_NEEDED, &vha->dpc_flags);
+			qla2xxx_wake_dpc(vha);
+		}
 		return PCI_ERS_RESULT_DISCONNECT;
 	}
 	return PCI_ERS_RESULT_NEED_RESET;
@@ -5955,6 +6164,13 @@ qla83xx_disable_laser(scsi_qla_host_t *vha)
 	qla83xx_wr_reg(vha, reg, data);
 }
 
+static int qla2xxx_map_queues(struct Scsi_Host *shost)
+{
+	scsi_qla_host_t *vha = (scsi_qla_host_t *)shost->hostdata;
+
+	return blk_mq_pci_map_queues(&shost->tag_set, vha->hw->pdev);
+}
+
 static const struct pci_error_handlers qla2xxx_err_handler = {
 	.error_detected = qla2xxx_pci_error_detected,
 	.mmio_enabled = qla2xxx_pci_mmio_enabled,