Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1292 insertions, 0 deletions

diff --git a/drivers/scsi/qla2xxx/qla_mid.c b/drivers/scsi/qla2xxx/qla_mid.c
new file mode 100644
index 0000000000..b67416951a
--- /dev/null
+++ b/drivers/scsi/qla2xxx/qla_mid.c
@@ -0,0 +1,1292 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * QLogic Fibre Channel HBA Driver
+ * Copyright (c)  2003-2014 QLogic Corporation
+ */
+#include "qla_def.h"
+#include "qla_gbl.h"
+#include "qla_target.h"
+
+#include <linux/moduleparam.h>
+#include <linux/vmalloc.h>
+#include <linux/slab.h>
+#include <linux/list.h>
+
+#include <scsi/scsi_tcq.h>
+#include <scsi/scsicam.h>
+#include <linux/delay.h>
+
+void
+qla2x00_vp_stop_timer(scsi_qla_host_t *vha)
+{
+	if (vha->vp_idx && vha->timer_active) {
+		del_timer_sync(&vha->timer);
+		vha->timer_active = 0;
+	}
+}
+
+static uint32_t
+qla24xx_allocate_vp_id(scsi_qla_host_t *vha)
+{
+	uint32_t vp_id;
+	struct qla_hw_data *ha = vha->hw;
+	unsigned long flags;
+
+	/* Find an empty slot and assign an vp_id */
+	mutex_lock(&ha->vport_lock);
+	vp_id = find_first_zero_bit(ha->vp_idx_map, ha->max_npiv_vports + 1);
+	if (vp_id > ha->max_npiv_vports) {
+		ql_dbg(ql_dbg_vport, vha, 0xa000,
+		    "vp_id %d is bigger than max-supported %d.\n",
+		    vp_id, ha->max_npiv_vports);
+		mutex_unlock(&ha->vport_lock);
+		return vp_id;
+	}
+
+	set_bit(vp_id, ha->vp_idx_map);
+	ha->num_vhosts++;
+	vha->vp_idx = vp_id;
+
+	spin_lock_irqsave(&ha->vport_slock, flags);
+	list_add_tail(&vha->list, &ha->vp_list);
+	spin_unlock_irqrestore(&ha->vport_slock, flags);
+
+	spin_lock_irqsave(&ha->hardware_lock, flags);
+	qla_update_vp_map(vha, SET_VP_IDX);
+	spin_unlock_irqrestore(&ha->hardware_lock, flags);
+
+	mutex_unlock(&ha->vport_lock);
+	return vp_id;
+}
+
+void
+qla24xx_deallocate_vp_id(scsi_qla_host_t *vha)
+{
+	uint16_t vp_id;
+	struct qla_hw_data *ha = vha->hw;
+	unsigned long flags = 0;
+	u32 i, bailout;
+
+	mutex_lock(&ha->vport_lock);
+	/*
+	 * Wait for all pending activities to finish before removing vport from
+	 * the list.
+	 * Lock needs to be held for safe removal from the list (it
+	 * ensures no active vp_list traversal while the vport is removed
+	 * from the queue)
+	 */
+	bailout = 0;
+	for (i = 0; i < 500; i++) {
+		spin_lock_irqsave(&ha->vport_slock, flags);
+		if (atomic_read(&vha->vref_count) == 0) {
+			list_del(&vha->list);
+			qla_update_vp_map(vha, RESET_VP_IDX);
+			bailout = 1;
+		}
+		spin_unlock_irqrestore(&ha->vport_slock, flags);
+
+		if (bailout)
+			break;
+		else
+			msleep(20);
+	}
+	if (!bailout) {
+		ql_log(ql_log_info, vha, 0xfffa,
+			"vha->vref_count=%u timeout\n", vha->vref_count.counter);
+		spin_lock_irqsave(&ha->vport_slock, flags);
+		list_del(&vha->list);
+		qla_update_vp_map(vha, RESET_VP_IDX);
+		spin_unlock_irqrestore(&ha->vport_slock, flags);
+	}
+
+	vp_id = vha->vp_idx;
+	ha->num_vhosts--;
+	clear_bit(vp_id, ha->vp_idx_map);
+
+	mutex_unlock(&ha->vport_lock);
+}
+
+static scsi_qla_host_t *
+qla24xx_find_vhost_by_name(struct qla_hw_data *ha, uint8_t *port_name)
+{
+	scsi_qla_host_t *vha;
+	struct scsi_qla_host *tvha;
+	unsigned long flags;
+
+	spin_lock_irqsave(&ha->vport_slock, flags);
+	/* Locate matching device in database. */
+	list_for_each_entry_safe(vha, tvha, &ha->vp_list, list) {
+		if (!memcmp(port_name, vha->port_name, WWN_SIZE)) {
+			spin_unlock_irqrestore(&ha->vport_slock, flags);
+			return vha;
+		}
+	}
+	spin_unlock_irqrestore(&ha->vport_slock, flags);
+	return NULL;
+}
+
+/*
+ * qla2x00_mark_vp_devices_dead
+ *	Updates fcport state when device goes offline.
+ *
+ * Input:
+ *	ha = adapter block pointer.
+ *	fcport = port structure pointer.
+ *
+ * Return:
+ *	None.
+ *
+ * Context:
+ */
+static void
+qla2x00_mark_vp_devices_dead(scsi_qla_host_t *vha)
+{
+	/*
+	 * !!! NOTE !!!
+	 * This function, if called in contexts other than vp create, disable
+	 * or delete, please make sure this is synchronized with the
+	 * delete thread.
+	 */
+	fc_port_t *fcport;
+
+	list_for_each_entry(fcport, &vha->vp_fcports, list) {
+		ql_dbg(ql_dbg_vport, vha, 0xa001,
+		    "Marking port dead, loop_id=0x%04x : %x.\n",
+		    fcport->loop_id, fcport->vha->vp_idx);
+
+		qla2x00_mark_device_lost(vha, fcport, 0);
+		qla2x00_set_fcport_state(fcport, FCS_UNCONFIGURED);
+	}
+}
+
+int
+qla24xx_disable_vp(scsi_qla_host_t *vha)
+{
+	unsigned long flags;
+	int ret = QLA_SUCCESS;
+	fc_port_t *fcport;
+
+	if (vha->hw->flags.edif_enabled) {
+		if (DBELL_ACTIVE(vha))
+			qla2x00_post_aen_work(vha, FCH_EVT_VENDOR_UNIQUE,
+			    FCH_EVT_VENDOR_UNIQUE_VPORT_DOWN);
+		/* delete sessions and flush sa_indexes */
+		qla2x00_wait_for_sess_deletion(vha);
+	}
+
+	if (vha->hw->flags.fw_started)
+		ret = qla24xx_control_vp(vha, VCE_COMMAND_DISABLE_VPS_LOGO_ALL);
+
+	atomic_set(&vha->loop_state, LOOP_DOWN);
+	atomic_set(&vha->loop_down_timer, LOOP_DOWN_TIME);
+	list_for_each_entry(fcport, &vha->vp_fcports, list)
+		fcport->logout_on_delete = 0;
+
+	if (!vha->hw->flags.edif_enabled)
+		qla2x00_wait_for_sess_deletion(vha);
+
+	/* Remove port id from vp target map */
+	spin_lock_irqsave(&vha->hw->hardware_lock, flags);
+	qla_update_vp_map(vha, RESET_AL_PA);
+	spin_unlock_irqrestore(&vha->hw->hardware_lock, flags);
+
+	qla2x00_mark_vp_devices_dead(vha);
+	atomic_set(&vha->vp_state, VP_FAILED);
+	vha->flags.management_server_logged_in = 0;
+	if (ret == QLA_SUCCESS) {
+		fc_vport_set_state(vha->fc_vport, FC_VPORT_DISABLED);
+	} else {
+		fc_vport_set_state(vha->fc_vport, FC_VPORT_FAILED);
+		return -1;
+	}
+	return 0;
+}
+
+int
+qla24xx_enable_vp(scsi_qla_host_t *vha)
+{
+	int ret;
+	struct qla_hw_data *ha = vha->hw;
+	scsi_qla_host_t *base_vha = pci_get_drvdata(ha->pdev);
+
+	/* Check if physical ha port is Up */
+	if (atomic_read(&base_vha->loop_state) == LOOP_DOWN  ||
+		atomic_read(&base_vha->loop_state) == LOOP_DEAD ||
+		!(ha->current_topology & ISP_CFG_F)) {
+		vha->vp_err_state =  VP_ERR_PORTDWN;
+		fc_vport_set_state(vha->fc_vport, FC_VPORT_LINKDOWN);
+		ql_dbg(ql_dbg_taskm, vha, 0x800b,
+		    "%s skip enable. loop_state %x topo %x\n",
+		    __func__, base_vha->loop_state.counter,
+		    ha->current_topology);
+
+		goto enable_failed;
+	}
+
+	/* Initialize the new vport unless it is a persistent port */
+	mutex_lock(&ha->vport_lock);
+	ret = qla24xx_modify_vp_config(vha);
+	mutex_unlock(&ha->vport_lock);
+
+	if (ret != QLA_SUCCESS) {
+		fc_vport_set_state(vha->fc_vport, FC_VPORT_FAILED);
+		goto enable_failed;
+	}
+
+	ql_dbg(ql_dbg_taskm, vha, 0x801a,
+	    "Virtual port with id: %d - Enabled.\n", vha->vp_idx);
+	return 0;
+
+enable_failed:
+	ql_dbg(ql_dbg_taskm, vha, 0x801b,
+	    "Virtual port with id: %d - Disabled.\n", vha->vp_idx);
+	return 1;
+}
+
+static void
+qla24xx_configure_vp(scsi_qla_host_t *vha)
+{
+	struct fc_vport *fc_vport;
+	int ret;
+
+	fc_vport = vha->fc_vport;
+
+	ql_dbg(ql_dbg_vport, vha, 0xa002,
+	    "%s: change request #3.\n", __func__);
+	ret = qla2x00_send_change_request(vha, 0x3, vha->vp_idx);
+	if (ret != QLA_SUCCESS) {
+		ql_dbg(ql_dbg_vport, vha, 0xa003, "Failed to enable "
+		    "receiving of RSCN requests: 0x%x.\n", ret);
+		return;
+	} else {
+		/* Corresponds to SCR enabled */
+		clear_bit(VP_SCR_NEEDED, &vha->vp_flags);
+	}
+
+	vha->flags.online = 1;
+	if (qla24xx_configure_vhba(vha))
+		return;
+
+	atomic_set(&vha->vp_state, VP_ACTIVE);
+	fc_vport_set_state(fc_vport, FC_VPORT_ACTIVE);
+}
+
+void
+qla2x00_alert_all_vps(struct rsp_que *rsp, uint16_t *mb)
+{
+	scsi_qla_host_t *vha, *tvp;
+	struct qla_hw_data *ha = rsp->hw;
+	int i = 0;
+	unsigned long flags;
+
+	spin_lock_irqsave(&ha->vport_slock, flags);
+	list_for_each_entry_safe(vha, tvp, &ha->vp_list, list) {
+		if (vha->vp_idx) {
+			if (test_bit(VPORT_DELETE, &vha->dpc_flags))
+				continue;
+
+			atomic_inc(&vha->vref_count);
+			spin_unlock_irqrestore(&ha->vport_slock, flags);
+
+			switch (mb[0]) {
+			case MBA_LIP_OCCURRED:
+			case MBA_LOOP_UP:
+			case MBA_LOOP_DOWN:
+			case MBA_LIP_RESET:
+			case MBA_POINT_TO_POINT:
+			case MBA_CHG_IN_CONNECTION:
+				ql_dbg(ql_dbg_async, vha, 0x5024,
+				    "Async_event for VP[%d], mb=0x%x vha=%p.\n",
+				    i, *mb, vha);
+				qla2x00_async_event(vha, rsp, mb);
+				break;
+			case MBA_PORT_UPDATE:
+			case MBA_RSCN_UPDATE:
+				if ((mb[3] & 0xff) == vha->vp_idx) {
+					ql_dbg(ql_dbg_async, vha, 0x5024,
+					    "Async_event for VP[%d], mb=0x%x vha=%p\n",
+					    i, *mb, vha);
+					qla2x00_async_event(vha, rsp, mb);
+				}
+				break;
+			}
+
+			spin_lock_irqsave(&ha->vport_slock, flags);
+			atomic_dec(&vha->vref_count);
+			wake_up(&vha->vref_waitq);
+		}
+		i++;
+	}
+	spin_unlock_irqrestore(&ha->vport_slock, flags);
+}
+
+int
+qla2x00_vp_abort_isp(scsi_qla_host_t *vha)
+{
+	fc_port_t *fcport;
+
+	/*
+	 * To exclusively reset vport, we need to log it out first.
+	 * Note: This control_vp can fail if ISP reset is already
+	 * issued, this is expected, as the vp would be already
+	 * logged out due to ISP reset.
+	 */
+	if (!test_bit(ABORT_ISP_ACTIVE, &vha->dpc_flags)) {
+		qla24xx_control_vp(vha, VCE_COMMAND_DISABLE_VPS_LOGO_ALL);
+		list_for_each_entry(fcport, &vha->vp_fcports, list)
+			fcport->logout_on_delete = 0;
+	}
+
+	/*
+	 * Physical port will do most of the abort and recovery work. We can
+	 * just treat it as a loop down
+	 */
+	if (atomic_read(&vha->loop_state) != LOOP_DOWN) {
+		atomic_set(&vha->loop_state, LOOP_DOWN);
+		qla2x00_mark_all_devices_lost(vha);
+	} else {
+		if (!atomic_read(&vha->loop_down_timer))
+			atomic_set(&vha->loop_down_timer, LOOP_DOWN_TIME);
+	}
+
+	ql_dbg(ql_dbg_taskm, vha, 0x801d,
+	    "Scheduling enable of Vport %d.\n", vha->vp_idx);
+
+	return qla24xx_enable_vp(vha);
+}
+
+static int
+qla2x00_do_dpc_vp(scsi_qla_host_t *vha)
+{
+	struct qla_hw_data *ha = vha->hw;
+	scsi_qla_host_t *base_vha = pci_get_drvdata(ha->pdev);
+
+	ql_dbg(ql_dbg_dpc + ql_dbg_verbose, vha, 0x4012,
+	    "Entering %s vp_flags: 0x%lx.\n", __func__, vha->vp_flags);
+
+	/* Check if Fw is ready to configure VP first */
+	if (test_bit(VP_CONFIG_OK, &base_vha->vp_flags)) {
+		if (test_and_clear_bit(VP_IDX_ACQUIRED, &vha->vp_flags)) {
+			/* VP acquired. complete port configuration */
+			ql_dbg(ql_dbg_dpc, vha, 0x4014,
+			    "Configure VP scheduled.\n");
+			qla24xx_configure_vp(vha);
+			ql_dbg(ql_dbg_dpc, vha, 0x4015,
+			    "Configure VP end.\n");
+			return 0;
+		}
+	}
+
+	if (test_bit(PROCESS_PUREX_IOCB, &vha->dpc_flags)) {
+		if (atomic_read(&vha->loop_state) == LOOP_READY) {
+			qla24xx_process_purex_list(&vha->purex_list);
+			clear_bit(PROCESS_PUREX_IOCB, &vha->dpc_flags);
+		}
+	}
+
+	if (test_bit(RELOGIN_NEEDED, &vha->dpc_flags) &&
+	    !test_bit(LOOP_RESYNC_NEEDED, &vha->dpc_flags) &&
+	    atomic_read(&vha->loop_state) != LOOP_DOWN) {
+
+		if (!vha->relogin_jif ||
+		    time_after_eq(jiffies, vha->relogin_jif)) {
+			vha->relogin_jif = jiffies + HZ;
+			clear_bit(RELOGIN_NEEDED, &vha->dpc_flags);
+
+			ql_dbg(ql_dbg_dpc, vha, 0x4018,
+			    "Relogin needed scheduled.\n");
+			qla24xx_post_relogin_work(vha);
+		}
+	}
+
+	if (test_and_clear_bit(RESET_MARKER_NEEDED, &vha->dpc_flags) &&
+	    (!(test_and_set_bit(RESET_ACTIVE, &vha->dpc_flags)))) {
+		clear_bit(RESET_ACTIVE, &vha->dpc_flags);
+	}
+
+	if (test_and_clear_bit(LOOP_RESYNC_NEEDED, &vha->dpc_flags)) {
+		if (!(test_and_set_bit(LOOP_RESYNC_ACTIVE, &vha->dpc_flags))) {
+			ql_dbg(ql_dbg_dpc, vha, 0x401a,
+			    "Loop resync scheduled.\n");
+			qla2x00_loop_resync(vha);
+			clear_bit(LOOP_RESYNC_ACTIVE, &vha->dpc_flags);
+			ql_dbg(ql_dbg_dpc, vha, 0x401b,
+			    "Loop resync end.\n");
+		}
+	}
+
+	ql_dbg(ql_dbg_dpc + ql_dbg_verbose, vha, 0x401c,
+	    "Exiting %s.\n", __func__);
+	return 0;
+}
+
+void
+qla2x00_do_dpc_all_vps(scsi_qla_host_t *vha)
+{
+	struct qla_hw_data *ha = vha->hw;
+	scsi_qla_host_t *vp, *tvp;
+	unsigned long flags = 0;
+
+	if (vha->vp_idx)
+		return;
+	if (list_empty(&ha->vp_list))
+		return;
+
+	clear_bit(VP_DPC_NEEDED, &vha->dpc_flags);
+
+	if (!(ha->current_topology & ISP_CFG_F))
+		return;
+
+	spin_lock_irqsave(&ha->vport_slock, flags);
+	list_for_each_entry_safe(vp, tvp, &ha->vp_list, list) {
+		if (vp->vp_idx) {
+			atomic_inc(&vp->vref_count);
+			spin_unlock_irqrestore(&ha->vport_slock, flags);
+
+			qla2x00_do_dpc_vp(vp);
+
+			spin_lock_irqsave(&ha->vport_slock, flags);
+			atomic_dec(&vp->vref_count);
+		}
+	}
+	spin_unlock_irqrestore(&ha->vport_slock, flags);
+}
+
+int
+qla24xx_vport_create_req_sanity_check(struct fc_vport *fc_vport)
+{
+	scsi_qla_host_t *base_vha = shost_priv(fc_vport->shost);
+	struct qla_hw_data *ha = base_vha->hw;
+	scsi_qla_host_t *vha;
+	uint8_t port_name[WWN_SIZE];
+
+	if (fc_vport->roles != FC_PORT_ROLE_FCP_INITIATOR)
+		return VPCERR_UNSUPPORTED;
+
+	/* Check up the F/W and H/W support NPIV */
+	if (!ha->flags.npiv_supported)
+		return VPCERR_UNSUPPORTED;
+
+	/* Check up whether npiv supported switch presented */
+	if (!(ha->switch_cap & FLOGI_MID_SUPPORT))
+		return VPCERR_NO_FABRIC_SUPP;
+
+	/* Check up unique WWPN */
+	u64_to_wwn(fc_vport->port_name, port_name);
+	if (!memcmp(port_name, base_vha->port_name, WWN_SIZE))
+		return VPCERR_BAD_WWN;
+	vha = qla24xx_find_vhost_by_name(ha, port_name);
+	if (vha)
+		return VPCERR_BAD_WWN;
+
+	/* Check up max-npiv-supports */
+	if (ha->num_vhosts > ha->max_npiv_vports) {
+		ql_dbg(ql_dbg_vport, vha, 0xa004,
+		    "num_vhosts %ud is bigger "
+		    "than max_npiv_vports %ud.\n",
+		    ha->num_vhosts, ha->max_npiv_vports);
+		return VPCERR_UNSUPPORTED;
+	}
+	return 0;
+}
+
+scsi_qla_host_t *
+qla24xx_create_vhost(struct fc_vport *fc_vport)
+{
+	scsi_qla_host_t *base_vha = shost_priv(fc_vport->shost);
+	struct qla_hw_data *ha = base_vha->hw;
+	scsi_qla_host_t *vha;
+	const struct scsi_host_template *sht = &qla2xxx_driver_template;
+	struct Scsi_Host *host;
+
+	vha = qla2x00_create_host(sht, ha);
+	if (!vha) {
+		ql_log(ql_log_warn, vha, 0xa005,
+		    "scsi_host_alloc() failed for vport.\n");
+		return(NULL);
+	}
+
+	host = vha->host;
+	fc_vport->dd_data = vha;
+	/* New host info */
+	u64_to_wwn(fc_vport->node_name, vha->node_name);
+	u64_to_wwn(fc_vport->port_name, vha->port_name);
+
+	vha->fc_vport = fc_vport;
+	vha->device_flags = 0;
+	vha->vp_idx = qla24xx_allocate_vp_id(vha);
+	if (vha->vp_idx > ha->max_npiv_vports) {
+		ql_dbg(ql_dbg_vport, vha, 0xa006,
+		    "Couldn't allocate vp_id.\n");
+		goto create_vhost_failed;
+	}
+	vha->mgmt_svr_loop_id = qla2x00_reserve_mgmt_server_loop_id(vha);
+
+	vha->dpc_flags = 0L;
+	ha->dpc_active = 0;
+	set_bit(REGISTER_FDMI_NEEDED, &vha->dpc_flags);
+	set_bit(REGISTER_FC4_NEEDED, &vha->dpc_flags);
+
+	/*
+	 * To fix the issue of processing a parent's RSCN for the vport before
+	 * its SCR is complete.
+	 */
+	set_bit(VP_SCR_NEEDED, &vha->vp_flags);
+	atomic_set(&vha->loop_state, LOOP_DOWN);
+	atomic_set(&vha->loop_down_timer, LOOP_DOWN_TIME);
+
+	qla2x00_start_timer(vha, WATCH_INTERVAL);
+
+	vha->req = base_vha->req;
+	vha->flags.nvme_enabled = base_vha->flags.nvme_enabled;
+	host->can_queue = base_vha->req->length + 128;
+	host->cmd_per_lun = 3;
+	if (IS_T10_PI_CAPABLE(ha) && ql2xenabledif)
+		host->max_cmd_len = 32;
+	else
+		host->max_cmd_len = MAX_CMDSZ;
+	host->max_channel = MAX_BUSES - 1;
+	host->max_lun = ql2xmaxlun;
+	host->unique_id = host->host_no;
+	host->max_id = ha->max_fibre_devices;
+	host->transportt = qla2xxx_transport_vport_template;
+
+	ql_dbg(ql_dbg_vport, vha, 0xa007,
+	    "Detect vport hba %ld at address = %p.\n",
+	    vha->host_no, vha);
+
+	vha->flags.init_done = 1;
+
+	mutex_lock(&ha->vport_lock);
+	set_bit(vha->vp_idx, ha->vp_idx_map);
+	ha->cur_vport_count++;
+	mutex_unlock(&ha->vport_lock);
+
+	return vha;
+
+create_vhost_failed:
+	return NULL;
+}
+
+static void
+qla25xx_free_req_que(struct scsi_qla_host *vha, struct req_que *req)
+{
+	struct qla_hw_data *ha = vha->hw;
+	uint16_t que_id = req->id;
+
+	dma_free_coherent(&ha->pdev->dev, (req->length + 1) *
+		sizeof(request_t), req->ring, req->dma);
+	req->ring = NULL;
+	req->dma = 0;
+	if (que_id) {
+		ha->req_q_map[que_id] = NULL;
+		mutex_lock(&ha->vport_lock);
+		clear_bit(que_id, ha->req_qid_map);
+		mutex_unlock(&ha->vport_lock);
+	}
+	kfree(req->outstanding_cmds);
+	kfree(req);
+}
+
+static void
+qla25xx_free_rsp_que(struct scsi_qla_host *vha, struct rsp_que *rsp)
+{
+	struct qla_hw_data *ha = vha->hw;
+	uint16_t que_id = rsp->id;
+
+	if (rsp->msix && rsp->msix->have_irq) {
+		free_irq(rsp->msix->vector, rsp->msix->handle);
+		rsp->msix->have_irq = 0;
+		rsp->msix->in_use = 0;
+		rsp->msix->handle = NULL;
+	}
+	dma_free_coherent(&ha->pdev->dev, (rsp->length + 1) *
+		sizeof(response_t), rsp->ring, rsp->dma);
+	rsp->ring = NULL;
+	rsp->dma = 0;
+	if (que_id) {
+		ha->rsp_q_map[que_id] = NULL;
+		mutex_lock(&ha->vport_lock);
+		clear_bit(que_id, ha->rsp_qid_map);
+		mutex_unlock(&ha->vport_lock);
+	}
+	kfree(rsp);
+}
+
+int
+qla25xx_delete_req_que(struct scsi_qla_host *vha, struct req_que *req)
+{
+	int ret = QLA_SUCCESS;
+
+	if (req && vha->flags.qpairs_req_created) {
+		req->options |= BIT_0;
+		ret = qla25xx_init_req_que(vha, req);
+		if (ret != QLA_SUCCESS)
+			return QLA_FUNCTION_FAILED;
+
+		qla25xx_free_req_que(vha, req);
+	}
+
+	return ret;
+}
+
+int
+qla25xx_delete_rsp_que(struct scsi_qla_host *vha, struct rsp_que *rsp)
+{
+	int ret = QLA_SUCCESS;
+
+	if (rsp && vha->flags.qpairs_rsp_created) {
+		rsp->options |= BIT_0;
+		ret = qla25xx_init_rsp_que(vha, rsp);
+		if (ret != QLA_SUCCESS)
+			return QLA_FUNCTION_FAILED;
+
+		qla25xx_free_rsp_que(vha, rsp);
+	}
+
+	return ret;
+}
+
+/* Delete all queues for a given vhost */
+int
+qla25xx_delete_queues(struct scsi_qla_host *vha)
+{
+	int cnt, ret = 0;
+	struct req_que *req = NULL;
+	struct rsp_que *rsp = NULL;
+	struct qla_hw_data *ha = vha->hw;
+	struct qla_qpair *qpair, *tqpair;
+
+	if (ql2xmqsupport || ql2xnvmeenable) {
+		list_for_each_entry_safe(qpair, tqpair, &vha->qp_list,
+		    qp_list_elem)
+			qla2xxx_delete_qpair(vha, qpair);
+	} else {
+		/* Delete request queues */
+		for (cnt = 1; cnt < ha->max_req_queues; cnt++) {
+			req = ha->req_q_map[cnt];
+			if (req && test_bit(cnt, ha->req_qid_map)) {
+				ret = qla25xx_delete_req_que(vha, req);
+				if (ret != QLA_SUCCESS) {
+					ql_log(ql_log_warn, vha, 0x00ea,
+					    "Couldn't delete req que %d.\n",
+					    req->id);
+					return ret;
+				}
+			}
+		}
+
+		/* Delete response queues */
+		for (cnt = 1; cnt < ha->max_rsp_queues; cnt++) {
+			rsp = ha->rsp_q_map[cnt];
+			if (rsp && test_bit(cnt, ha->rsp_qid_map)) {
+				ret = qla25xx_delete_rsp_que(vha, rsp);
+				if (ret != QLA_SUCCESS) {
+					ql_log(ql_log_warn, vha, 0x00eb,
+					    "Couldn't delete rsp que %d.\n",
+					    rsp->id);
+					return ret;
+				}
+			}
+		}
+	}
+
+	return ret;
+}
+
+int
+qla25xx_create_req_que(struct qla_hw_data *ha, uint16_t options,
+    uint8_t vp_idx, uint16_t rid, int rsp_que, uint8_t qos, bool startqp)
+{
+	int ret = 0;
+	struct req_que *req = NULL;
+	struct scsi_qla_host *base_vha = pci_get_drvdata(ha->pdev);
+	struct scsi_qla_host *vha = pci_get_drvdata(ha->pdev);
+	uint16_t que_id = 0;
+	device_reg_t *reg;
+	uint32_t cnt;
+
+	req = kzalloc(sizeof(struct req_que), GFP_KERNEL);
+	if (req == NULL) {
+		ql_log(ql_log_fatal, base_vha, 0x00d9,
+		    "Failed to allocate memory for request queue.\n");
+		goto failed;
+	}
+
+	req->length = REQUEST_ENTRY_CNT_24XX;
+	req->ring = dma_alloc_coherent(&ha->pdev->dev,
+			(req->length + 1) * sizeof(request_t),
+			&req->dma, GFP_KERNEL);
+	if (req->ring == NULL) {
+		ql_log(ql_log_fatal, base_vha, 0x00da,
+		    "Failed to allocate memory for request_ring.\n");
+		goto que_failed;
+	}
+
+	ret = qla2x00_alloc_outstanding_cmds(ha, req);
+	if (ret != QLA_SUCCESS)
+		goto que_failed;
+
+	mutex_lock(&ha->mq_lock);
+	que_id = find_first_zero_bit(ha->req_qid_map, ha->max_req_queues);
+	if (que_id >= ha->max_req_queues) {
+		mutex_unlock(&ha->mq_lock);
+		ql_log(ql_log_warn, base_vha, 0x00db,
+		    "No resources to create additional request queue.\n");
+		goto que_failed;
+	}
+	set_bit(que_id, ha->req_qid_map);
+	ha->req_q_map[que_id] = req;
+	req->rid = rid;
+	req->vp_idx = vp_idx;
+	req->qos = qos;
+
+	ql_dbg(ql_dbg_multiq, base_vha, 0xc002,
+	    "queue_id=%d rid=%d vp_idx=%d qos=%d.\n",
+	    que_id, req->rid, req->vp_idx, req->qos);
+	ql_dbg(ql_dbg_init, base_vha, 0x00dc,
+	    "queue_id=%d rid=%d vp_idx=%d qos=%d.\n",
+	    que_id, req->rid, req->vp_idx, req->qos);
+	if (rsp_que < 0)
+		req->rsp = NULL;
+	else
+		req->rsp = ha->rsp_q_map[rsp_que];
+	/* Use alternate PCI bus number */
+	if (MSB(req->rid))
+		options |= BIT_4;
+	/* Use alternate PCI devfn */
+	if (LSB(req->rid))
+		options |= BIT_5;
+	req->options = options;
+
+	ql_dbg(ql_dbg_multiq, base_vha, 0xc003,
+	    "options=0x%x.\n", req->options);
+	ql_dbg(ql_dbg_init, base_vha, 0x00dd,
+	    "options=0x%x.\n", req->options);
+	for (cnt = 1; cnt < req->num_outstanding_cmds; cnt++)
+		req->outstanding_cmds[cnt] = NULL;
+	req->current_outstanding_cmd = 1;
+
+	req->ring_ptr = req->ring;
+	req->ring_index = 0;
+	req->cnt = req->length;
+	req->id = que_id;
+	reg = ISP_QUE_REG(ha, que_id);
+	req->req_q_in = &reg->isp25mq.req_q_in;
+	req->req_q_out = &reg->isp25mq.req_q_out;
+	req->max_q_depth = ha->req_q_map[0]->max_q_depth;
+	req->out_ptr = (uint16_t *)(req->ring + req->length);
+	mutex_unlock(&ha->mq_lock);
+	ql_dbg(ql_dbg_multiq, base_vha, 0xc004,
+	    "ring_ptr=%p ring_index=%d, "
+	    "cnt=%d id=%d max_q_depth=%d.\n",
+	    req->ring_ptr, req->ring_index,
+	    req->cnt, req->id, req->max_q_depth);
+	ql_dbg(ql_dbg_init, base_vha, 0x00de,
+	    "ring_ptr=%p ring_index=%d, "
+	    "cnt=%d id=%d max_q_depth=%d.\n",
+	    req->ring_ptr, req->ring_index, req->cnt,
+	    req->id, req->max_q_depth);
+
+	if (startqp) {
+		ret = qla25xx_init_req_que(base_vha, req);
+		if (ret != QLA_SUCCESS) {
+			ql_log(ql_log_fatal, base_vha, 0x00df,
+			    "%s failed.\n", __func__);
+			mutex_lock(&ha->mq_lock);
+			clear_bit(que_id, ha->req_qid_map);
+			mutex_unlock(&ha->mq_lock);
+			goto que_failed;
+		}
+		vha->flags.qpairs_req_created = 1;
+	}
+
+	return req->id;
+
+que_failed:
+	qla25xx_free_req_que(base_vha, req);
+failed:
+	return 0;
+}
+
+static void qla_do_work(struct work_struct *work)
+{
+	unsigned long flags;
+	struct qla_qpair *qpair = container_of(work, struct qla_qpair, q_work);
+	struct scsi_qla_host *vha = qpair->vha;
+
+	spin_lock_irqsave(&qpair->qp_lock, flags);
+	qla24xx_process_response_queue(vha, qpair->rsp);
+	spin_unlock_irqrestore(&qpair->qp_lock, flags);
+
+}
+
+/* create response queue */
+int
+qla25xx_create_rsp_que(struct qla_hw_data *ha, uint16_t options,
+    uint8_t vp_idx, uint16_t rid, struct qla_qpair *qpair, bool startqp)
+{
+	int ret = 0;
+	struct rsp_que *rsp = NULL;
+	struct scsi_qla_host *base_vha = pci_get_drvdata(ha->pdev);
+	struct scsi_qla_host *vha = pci_get_drvdata(ha->pdev);
+	uint16_t que_id = 0;
+	device_reg_t *reg;
+
+	rsp = kzalloc(sizeof(struct rsp_que), GFP_KERNEL);
+	if (rsp == NULL) {
+		ql_log(ql_log_warn, base_vha, 0x0066,
+		    "Failed to allocate memory for response queue.\n");
+		goto failed;
+	}
+
+	rsp->length = RESPONSE_ENTRY_CNT_MQ;
+	rsp->ring = dma_alloc_coherent(&ha->pdev->dev,
+			(rsp->length + 1) * sizeof(response_t),
+			&rsp->dma, GFP_KERNEL);
+	if (rsp->ring == NULL) {
+		ql_log(ql_log_warn, base_vha, 0x00e1,
+		    "Failed to allocate memory for response ring.\n");
+		goto que_failed;
+	}
+
+	mutex_lock(&ha->mq_lock);
+	que_id = find_first_zero_bit(ha->rsp_qid_map, ha->max_rsp_queues);
+	if (que_id >= ha->max_rsp_queues) {
+		mutex_unlock(&ha->mq_lock);
+		ql_log(ql_log_warn, base_vha, 0x00e2,
+		    "No resources to create additional request queue.\n");
+		goto que_failed;
+	}
+	set_bit(que_id, ha->rsp_qid_map);
+
+	rsp->msix = qpair->msix;
+
+	ha->rsp_q_map[que_id] = rsp;
+	rsp->rid = rid;
+	rsp->vp_idx = vp_idx;
+	rsp->hw = ha;
+	ql_dbg(ql_dbg_init, base_vha, 0x00e4,
+	    "rsp queue_id=%d rid=%d vp_idx=%d hw=%p.\n",
+	    que_id, rsp->rid, rsp->vp_idx, rsp->hw);
+	/* Use alternate PCI bus number */
+	if (MSB(rsp->rid))
+		options |= BIT_4;
+	/* Use alternate PCI devfn */
+	if (LSB(rsp->rid))
+		options |= BIT_5;
+	/* Enable MSIX handshake mode on for uncapable adapters */
+	if (!IS_MSIX_NACK_CAPABLE(ha))
+		options |= BIT_6;
+
+	/* Set option to indicate response queue creation */
+	options |= BIT_1;
+
+	rsp->options = options;
+	rsp->id = que_id;
+	reg = ISP_QUE_REG(ha, que_id);
+	rsp->rsp_q_in = &reg->isp25mq.rsp_q_in;
+	rsp->rsp_q_out = &reg->isp25mq.rsp_q_out;
+	rsp->in_ptr = (uint16_t *)(rsp->ring + rsp->length);
+	mutex_unlock(&ha->mq_lock);
+	ql_dbg(ql_dbg_multiq, base_vha, 0xc00b,
+	    "options=%x id=%d rsp_q_in=%p rsp_q_out=%p\n",
+	    rsp->options, rsp->id, rsp->rsp_q_in,
+	    rsp->rsp_q_out);
+	ql_dbg(ql_dbg_init, base_vha, 0x00e5,
+	    "options=%x id=%d rsp_q_in=%p rsp_q_out=%p\n",
+	    rsp->options, rsp->id, rsp->rsp_q_in,
+	    rsp->rsp_q_out);
+
+	ret = qla25xx_request_irq(ha, qpair, qpair->msix,
+		ha->flags.disable_msix_handshake ?
+		QLA_MSIX_QPAIR_MULTIQ_RSP_Q : QLA_MSIX_QPAIR_MULTIQ_RSP_Q_HS);
+	if (ret)
+		goto que_failed;
+
+	if (startqp) {
+		ret = qla25xx_init_rsp_que(base_vha, rsp);
+		if (ret != QLA_SUCCESS) {
+			ql_log(ql_log_fatal, base_vha, 0x00e7,
+			    "%s failed.\n", __func__);
+			mutex_lock(&ha->mq_lock);
+			clear_bit(que_id, ha->rsp_qid_map);
+			mutex_unlock(&ha->mq_lock);
+			goto que_failed;
+		}
+		vha->flags.qpairs_rsp_created = 1;
+	}
+	rsp->req = NULL;
+
+	qla2x00_init_response_q_entries(rsp);
+	if (qpair->hw->wq)
+		INIT_WORK(&qpair->q_work, qla_do_work);
+	return rsp->id;
+
+que_failed:
+	qla25xx_free_rsp_que(base_vha, rsp);
+failed:
+	return 0;
+}
+
+static void qla_ctrlvp_sp_done(srb_t *sp, int res)
+{
+	if (sp->comp)
+		complete(sp->comp);
+	/* don't free sp here. Let the caller do the free */
+}
+
+/**
+ * qla24xx_control_vp() - Enable a virtual port for given host
+ * @vha:	adapter block pointer
+ * @cmd:	command type to be sent for enable virtual port
+ *
+ * Return:	qla2xxx local function return status code.
+ */
+int qla24xx_control_vp(scsi_qla_host_t *vha, int cmd)
+{
+	int rval = QLA_MEMORY_ALLOC_FAILED;
+	struct qla_hw_data *ha = vha->hw;
+	int	vp_index = vha->vp_idx;
+	struct scsi_qla_host *base_vha = pci_get_drvdata(ha->pdev);
+	DECLARE_COMPLETION_ONSTACK(comp);
+	srb_t *sp;
+
+	ql_dbg(ql_dbg_vport, vha, 0x10c1,
+	    "Entered %s cmd %x index %d.\n", __func__, cmd, vp_index);
+
+	if (vp_index == 0 || vp_index >= ha->max_npiv_vports)
+		return QLA_PARAMETER_ERROR;
+
+	/* ref: INIT */
+	sp = qla2x00_get_sp(base_vha, NULL, GFP_KERNEL);
+	if (!sp)
+		return rval;
+
+	sp->type = SRB_CTRL_VP;
+	sp->name = "ctrl_vp";
+	sp->comp = &comp;
+	qla2x00_init_async_sp(sp, qla2x00_get_async_timeout(vha) + 2,
+			      qla_ctrlvp_sp_done);
+	sp->u.iocb_cmd.u.ctrlvp.cmd = cmd;
+	sp->u.iocb_cmd.u.ctrlvp.vp_index = vp_index;
+
+	rval = qla2x00_start_sp(sp);
+	if (rval != QLA_SUCCESS) {
+		ql_dbg(ql_dbg_async, vha, 0xffff,
+		    "%s: %s Failed submission. %x.\n",
+		    __func__, sp->name, rval);
+		goto done;
+	}
+
+	ql_dbg(ql_dbg_vport, vha, 0x113f, "%s hndl %x submitted\n",
+	    sp->name, sp->handle);
+
+	wait_for_completion(&comp);
+	sp->comp = NULL;
+
+	rval = sp->rc;
+	switch (rval) {
+	case QLA_FUNCTION_TIMEOUT:
+		ql_dbg(ql_dbg_vport, vha, 0xffff, "%s: %s Timeout. %x.\n",
+		    __func__, sp->name, rval);
+		break;
+	case QLA_SUCCESS:
+		ql_dbg(ql_dbg_vport, vha, 0xffff, "%s: %s done.\n",
+		    __func__, sp->name);
+		break;
+	default:
+		ql_dbg(ql_dbg_vport, vha, 0xffff, "%s: %s Failed. %x.\n",
+		    __func__, sp->name, rval);
+		break;
+	}
+done:
+	/* ref: INIT */
+	kref_put(&sp->cmd_kref, qla2x00_sp_release);
+	return rval;
+}
+
+struct scsi_qla_host *qla_find_host_by_vp_idx(struct scsi_qla_host *vha, uint16_t vp_idx)
+{
+	struct qla_hw_data *ha = vha->hw;
+
+	if (vha->vp_idx == vp_idx)
+		return vha;
+
+	BUG_ON(ha->vp_map == NULL);
+	if (likely(test_bit(vp_idx, ha->vp_idx_map)))
+		return ha->vp_map[vp_idx].vha;
+
+	return NULL;
+}
+
+/* vport_slock to be held by the caller */
+void
+qla_update_vp_map(struct scsi_qla_host *vha, int cmd)
+{
+	void *slot;
+	u32 key;
+	int rc;
+
+	if (!vha->hw->vp_map)
+		return;
+
+	key = vha->d_id.b24;
+
+	switch (cmd) {
+	case SET_VP_IDX:
+		vha->hw->vp_map[vha->vp_idx].vha = vha;
+		break;
+	case SET_AL_PA:
+		slot = btree_lookup32(&vha->hw->host_map, key);
+		if (!slot) {
+			ql_dbg(ql_dbg_disc, vha, 0xf018,
+			    "Save vha in host_map %p %06x\n", vha, key);
+			rc = btree_insert32(&vha->hw->host_map,
+			    key, vha, GFP_ATOMIC);
+			if (rc)
+				ql_log(ql_log_info, vha, 0xd03e,
+				    "Unable to insert s_id into host_map: %06x\n",
+				    key);
+			return;
+		}
+		ql_dbg(ql_dbg_disc, vha, 0xf019,
+		    "replace existing vha in host_map %p %06x\n", vha, key);
+		btree_update32(&vha->hw->host_map, key, vha);
+		break;
+	case RESET_VP_IDX:
+		vha->hw->vp_map[vha->vp_idx].vha = NULL;
+		break;
+	case RESET_AL_PA:
+		ql_dbg(ql_dbg_disc, vha, 0xf01a,
+		    "clear vha in host_map %p %06x\n", vha, key);
+		slot = btree_lookup32(&vha->hw->host_map, key);
+		if (slot)
+			btree_remove32(&vha->hw->host_map, key);
+		vha->d_id.b24 = 0;
+		break;
+	}
+}
+
+void qla_update_host_map(struct scsi_qla_host *vha, port_id_t id)
+{
+
+	if (!vha->d_id.b24) {
+		vha->d_id = id;
+		qla_update_vp_map(vha, SET_AL_PA);
+	} else if (vha->d_id.b24 != id.b24) {
+		qla_update_vp_map(vha, RESET_AL_PA);
+		vha->d_id = id;
+		qla_update_vp_map(vha, SET_AL_PA);
+	}
+}
+
+int qla_create_buf_pool(struct scsi_qla_host *vha, struct qla_qpair *qp)
+{
+	int sz;
+
+	qp->buf_pool.num_bufs = qp->req->length;
+
+	sz = BITS_TO_LONGS(qp->req->length);
+	qp->buf_pool.buf_map   = kcalloc(sz, sizeof(long), GFP_KERNEL);
+	if (!qp->buf_pool.buf_map) {
+		ql_log(ql_log_warn, vha, 0x0186,
+		    "Failed to allocate buf_map(%zd).\n", sz * sizeof(unsigned long));
+		return -ENOMEM;
+	}
+	sz = qp->req->length * sizeof(void *);
+	qp->buf_pool.buf_array = kcalloc(qp->req->length, sizeof(void *), GFP_KERNEL);
+	if (!qp->buf_pool.buf_array) {
+		ql_log(ql_log_warn, vha, 0x0186,
+		    "Failed to allocate buf_array(%d).\n", sz);
+		kfree(qp->buf_pool.buf_map);
+		return -ENOMEM;
+	}
+	sz = qp->req->length * sizeof(dma_addr_t);
+	qp->buf_pool.dma_array = kcalloc(qp->req->length, sizeof(dma_addr_t), GFP_KERNEL);
+	if (!qp->buf_pool.dma_array) {
+		ql_log(ql_log_warn, vha, 0x0186,
+		    "Failed to allocate dma_array(%d).\n", sz);
+		kfree(qp->buf_pool.buf_map);
+		kfree(qp->buf_pool.buf_array);
+		return -ENOMEM;
+	}
+	set_bit(0, qp->buf_pool.buf_map);
+	return 0;
+}
+
+void qla_free_buf_pool(struct qla_qpair *qp)
+{
+	int i;
+	struct qla_hw_data *ha = qp->vha->hw;
+
+	for (i = 0; i < qp->buf_pool.num_bufs; i++) {
+		if (qp->buf_pool.buf_array[i] && qp->buf_pool.dma_array[i])
+			dma_pool_free(ha->fcp_cmnd_dma_pool, qp->buf_pool.buf_array[i],
+			    qp->buf_pool.dma_array[i]);
+		qp->buf_pool.buf_array[i] = NULL;
+		qp->buf_pool.dma_array[i] = 0;
+	}
+
+	kfree(qp->buf_pool.dma_array);
+	kfree(qp->buf_pool.buf_array);
+	kfree(qp->buf_pool.buf_map);
+}
+
+/* it is assume qp->qp_lock is held at this point */
+int qla_get_buf(struct scsi_qla_host *vha, struct qla_qpair *qp, struct qla_buf_dsc *dsc)
+{
+	u16 tag, i = 0;
+	void *buf;
+	dma_addr_t buf_dma;
+	struct qla_hw_data *ha = vha->hw;
+
+	dsc->tag = TAG_FREED;
+again:
+	tag = find_first_zero_bit(qp->buf_pool.buf_map, qp->buf_pool.num_bufs);
+	if (tag >= qp->buf_pool.num_bufs) {
+		ql_dbg(ql_dbg_io, vha, 0x00e2,
+		    "qp(%d) ran out of buf resource.\n", qp->id);
+		return  -EIO;
+	}
+	if (tag == 0) {
+		set_bit(0, qp->buf_pool.buf_map);
+		i++;
+		if (i == 5) {
+			ql_dbg(ql_dbg_io, vha, 0x00e3,
+			    "qp(%d) unable to get tag.\n", qp->id);
+			return -EIO;
+		}
+		goto again;
+	}
+
+	if (!qp->buf_pool.buf_array[tag]) {
+		buf = dma_pool_zalloc(ha->fcp_cmnd_dma_pool, GFP_ATOMIC, &buf_dma);
+		if (!buf) {
+			ql_log(ql_log_fatal, vha, 0x13b1,
+			    "Failed to allocate buf.\n");
+			return -ENOMEM;
+		}
+
+		dsc->buf = qp->buf_pool.buf_array[tag] = buf;
+		dsc->buf_dma = qp->buf_pool.dma_array[tag] = buf_dma;
+		qp->buf_pool.num_alloc++;
+	} else {
+		dsc->buf = qp->buf_pool.buf_array[tag];
+		dsc->buf_dma = qp->buf_pool.dma_array[tag];
+		memset(dsc->buf, 0, FCP_CMND_DMA_POOL_SIZE);
+	}
+
+	qp->buf_pool.num_active++;
+	if (qp->buf_pool.num_active > qp->buf_pool.max_used)
+		qp->buf_pool.max_used = qp->buf_pool.num_active;
+
+	dsc->tag = tag;
+	set_bit(tag, qp->buf_pool.buf_map);
+	return 0;
+}
+
+static void qla_trim_buf(struct qla_qpair *qp, u16 trim)
+{
+	int i, j;
+	struct qla_hw_data *ha = qp->vha->hw;
+
+	if (!trim)
+		return;
+
+	for (i = 0; i < trim; i++) {
+		j = qp->buf_pool.num_alloc - 1;
+		if (test_bit(j, qp->buf_pool.buf_map)) {
+			ql_dbg(ql_dbg_io + ql_dbg_verbose, qp->vha, 0x300b,
+			       "QP id(%d): trim active buf[%d]. Remain %d bufs\n",
+			       qp->id, j, qp->buf_pool.num_alloc);
+			return;
+		}
+
+		if (qp->buf_pool.buf_array[j]) {
+			dma_pool_free(ha->fcp_cmnd_dma_pool, qp->buf_pool.buf_array[j],
+				      qp->buf_pool.dma_array[j]);
+			qp->buf_pool.buf_array[j] = NULL;
+			qp->buf_pool.dma_array[j] = 0;
+		}
+		qp->buf_pool.num_alloc--;
+		if (!qp->buf_pool.num_alloc)
+			break;
+	}
+	ql_dbg(ql_dbg_io + ql_dbg_verbose, qp->vha, 0x3010,
+	       "QP id(%d): trimmed %d bufs. Remain %d bufs\n",
+	       qp->id, trim, qp->buf_pool.num_alloc);
+}
+
+static void __qla_adjust_buf(struct qla_qpair *qp)
+{
+	u32 trim;
+
+	qp->buf_pool.take_snapshot = 0;
+	qp->buf_pool.prev_max = qp->buf_pool.max_used;
+	qp->buf_pool.max_used = qp->buf_pool.num_active;
+
+	if (qp->buf_pool.prev_max > qp->buf_pool.max_used &&
+	    qp->buf_pool.num_alloc > qp->buf_pool.max_used) {
+		/* down trend */
+		trim = qp->buf_pool.num_alloc - qp->buf_pool.max_used;
+		trim  = (trim * 10) / 100;
+		trim = trim ? trim : 1;
+		qla_trim_buf(qp, trim);
+	} else if (!qp->buf_pool.prev_max  && !qp->buf_pool.max_used) {
+		/* 2 periods of no io */
+		qla_trim_buf(qp, qp->buf_pool.num_alloc);
+	}
+}
+
+/* it is assume qp->qp_lock is held at this point */
+void qla_put_buf(struct qla_qpair *qp, struct qla_buf_dsc *dsc)
+{
+	if (dsc->tag == TAG_FREED)
+		return;
+	lockdep_assert_held(qp->qp_lock_ptr);
+
+	clear_bit(dsc->tag, qp->buf_pool.buf_map);
+	qp->buf_pool.num_active--;
+	dsc->tag = TAG_FREED;
+
+	if (qp->buf_pool.take_snapshot)
+		__qla_adjust_buf(qp);
+}
+
+#define EXPIRE (60 * HZ)
+void qla_adjust_buf(struct scsi_qla_host *vha)
+{
+	unsigned long flags;
+	int i;
+	struct qla_qpair *qp;
+
+	if (vha->vp_idx)
+		return;
+
+	if (!vha->buf_expired) {
+		vha->buf_expired = jiffies + EXPIRE;
+		return;
+	}
+	if (time_before(jiffies, vha->buf_expired))
+		return;
+
+	vha->buf_expired = jiffies + EXPIRE;
+
+	for (i = 0; i < vha->hw->num_qpairs; i++) {
+		qp = vha->hw->queue_pair_map[i];
+		if (!qp)
+			continue;
+		if (!qp->buf_pool.num_alloc)
+			continue;
+
+		if (qp->buf_pool.take_snapshot) {
+			/* no io has gone through in the last EXPIRE period */
+			spin_lock_irqsave(qp->qp_lock_ptr, flags);
+			__qla_adjust_buf(qp);
+			spin_unlock_irqrestore(qp->qp_lock_ptr, flags);
+		} else {
+			qp->buf_pool.take_snapshot = 1;
+		}
+	}
+}