qla_target.c 183 KB
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/*
 *  qla_target.c SCSI LLD infrastructure for QLogic 22xx/23xx/24xx/25xx
 *
 *  based on qla2x00t.c code:
 *
 *  Copyright (C) 2004 - 2010 Vladislav Bolkhovitin <vst@vlnb.net>
 *  Copyright (C) 2004 - 2005 Leonid Stoljar
 *  Copyright (C) 2006 Nathaniel Clark <nate@misrule.us>
 *  Copyright (C) 2006 - 2010 ID7 Ltd.
 *
 *  Forward port and refactoring to modern qla2xxx and target/configfs
 *
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 *  Copyright (C) 2010-2013 Nicholas A. Bellinger <nab@kernel.org>
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 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License
 *  as published by the Free Software Foundation, version 2
 *  of the License.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 *  GNU General Public License for more details.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/blkdev.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/list.h>
#include <linux/workqueue.h>
#include <asm/unaligned.h>
#include <scsi/scsi.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_tcq.h>
#include <target/target_core_base.h>
#include <target/target_core_fabric.h>

#include "qla_def.h"
#include "qla_target.h"

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static int ql2xtgt_tape_enable;
module_param(ql2xtgt_tape_enable, int, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(ql2xtgt_tape_enable,
		"Enables Sequence level error recovery (aka FC Tape). Default is 0 - no SLER. 1 - Enable SLER.");

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static char *qlini_mode = QLA2XXX_INI_MODE_STR_ENABLED;
module_param(qlini_mode, charp, S_IRUGO);
MODULE_PARM_DESC(qlini_mode,
	"Determines when initiator mode will be enabled. Possible values: "
	"\"exclusive\" - initiator mode will be enabled on load, "
	"disabled on enabling target mode and then on disabling target mode "
	"enabled back; "
	"\"disabled\" - initiator mode will never be enabled; "
	"\"enabled\" (default) - initiator mode will always stay enabled.");

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int ql2x_ini_mode = QLA2XXX_INI_MODE_EXCLUSIVE;
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static int temp_sam_status = SAM_STAT_BUSY;

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/*
 * From scsi/fc/fc_fcp.h
 */
enum fcp_resp_rsp_codes {
	FCP_TMF_CMPL = 0,
	FCP_DATA_LEN_INVALID = 1,
	FCP_CMND_FIELDS_INVALID = 2,
	FCP_DATA_PARAM_MISMATCH = 3,
	FCP_TMF_REJECTED = 4,
	FCP_TMF_FAILED = 5,
	FCP_TMF_INVALID_LUN = 9,
};

/*
 * fc_pri_ta from scsi/fc/fc_fcp.h
 */
#define FCP_PTA_SIMPLE      0   /* simple task attribute */
#define FCP_PTA_HEADQ       1   /* head of queue task attribute */
#define FCP_PTA_ORDERED     2   /* ordered task attribute */
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#define FCP_PTA_ACA         4   /* auto. contingent allegiance */
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#define FCP_PTA_MASK        7   /* mask for task attribute field */
#define FCP_PRI_SHIFT       3   /* priority field starts in bit 3 */
#define FCP_PRI_RESVD_MASK  0x80        /* reserved bits in priority field */

/*
 * This driver calls qla2x00_alloc_iocbs() and qla2x00_issue_marker(), which
 * must be called under HW lock and could unlock/lock it inside.
 * It isn't an issue, since in the current implementation on the time when
 * those functions are called:
 *
 *   - Either context is IRQ and only IRQ handler can modify HW data,
 *     including rings related fields,
 *
 *   - Or access to target mode variables from struct qla_tgt doesn't
 *     cross those functions boundaries, except tgt_stop, which
 *     additionally protected by irq_cmd_count.
 */
/* Predefs for callbacks handed to qla2xxx LLD */
static void qlt_24xx_atio_pkt(struct scsi_qla_host *ha,
	struct atio_from_isp *pkt);
static void qlt_response_pkt(struct scsi_qla_host *ha, response_t *pkt);
static int qlt_issue_task_mgmt(struct qla_tgt_sess *sess, uint32_t lun,
	int fn, void *iocb, int flags);
static void qlt_send_term_exchange(struct scsi_qla_host *ha, struct qla_tgt_cmd
	*cmd, struct atio_from_isp *atio, int ha_locked);
static void qlt_reject_free_srr_imm(struct scsi_qla_host *ha,
	struct qla_tgt_srr_imm *imm, int ha_lock);
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static void qlt_abort_cmd_on_host_reset(struct scsi_qla_host *vha,
	struct qla_tgt_cmd *cmd);
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static void qlt_alloc_qfull_cmd(struct scsi_qla_host *vha,
	struct atio_from_isp *atio, uint16_t status, int qfull);
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static void qlt_disable_vha(struct scsi_qla_host *vha);
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static void qlt_clear_tgt_db(struct qla_tgt *tgt);
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static void qlt_send_notify_ack(struct scsi_qla_host *vha,
	struct imm_ntfy_from_isp *ntfy,
	uint32_t add_flags, uint16_t resp_code, int resp_code_valid,
	uint16_t srr_flags, uint16_t srr_reject_code, uint8_t srr_explan);
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static void qlt_send_term_imm_notif(struct scsi_qla_host *vha,
	struct imm_ntfy_from_isp *imm, int ha_locked);
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/*
 * Global Variables
 */
static struct kmem_cache *qla_tgt_mgmt_cmd_cachep;
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static struct kmem_cache *qla_tgt_plogi_cachep;
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static mempool_t *qla_tgt_mgmt_cmd_mempool;
static struct workqueue_struct *qla_tgt_wq;
static DEFINE_MUTEX(qla_tgt_mutex);
static LIST_HEAD(qla_tgt_glist);

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/* This API intentionally takes dest as a parameter, rather than returning
 * int value to avoid caller forgetting to issue wmb() after the store */
void qlt_do_generation_tick(struct scsi_qla_host *vha, int *dest)
{
	scsi_qla_host_t *base_vha = pci_get_drvdata(vha->hw->pdev);
	*dest = atomic_inc_return(&base_vha->generation_tick);
	/* memory barrier */
	wmb();
}

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/* ha->hardware_lock supposed to be held on entry (to protect tgt->sess_list) */
static struct qla_tgt_sess *qlt_find_sess_by_port_name(
	struct qla_tgt *tgt,
	const uint8_t *port_name)
{
	struct qla_tgt_sess *sess;

	list_for_each_entry(sess, &tgt->sess_list, sess_list_entry) {
		if (!memcmp(sess->port_name, port_name, WWN_SIZE))
			return sess;
	}

	return NULL;
}

/* Might release hw lock, then reaquire!! */
static inline int qlt_issue_marker(struct scsi_qla_host *vha, int vha_locked)
{
	/* Send marker if required */
	if (unlikely(vha->marker_needed != 0)) {
		int rc = qla2x00_issue_marker(vha, vha_locked);
		if (rc != QLA_SUCCESS) {
			ql_dbg(ql_dbg_tgt, vha, 0xe03d,
			    "qla_target(%d): issue_marker() failed\n",
			    vha->vp_idx);
		}
		return rc;
	}
	return QLA_SUCCESS;
}

static inline
struct scsi_qla_host *qlt_find_host_by_d_id(struct scsi_qla_host *vha,
	uint8_t *d_id)
{
	struct qla_hw_data *ha = vha->hw;
	uint8_t vp_idx;

	if ((vha->d_id.b.area != d_id[1]) || (vha->d_id.b.domain != d_id[0]))
		return NULL;

	if (vha->d_id.b.al_pa == d_id[2])
		return vha;

	BUG_ON(ha->tgt.tgt_vp_map == NULL);
	vp_idx = ha->tgt.tgt_vp_map[d_id[2]].idx;
	if (likely(test_bit(vp_idx, ha->vp_idx_map)))
		return ha->tgt.tgt_vp_map[vp_idx].vha;

	return NULL;
}

static inline
struct scsi_qla_host *qlt_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->tgt.tgt_vp_map == NULL);
	if (likely(test_bit(vp_idx, ha->vp_idx_map)))
		return ha->tgt.tgt_vp_map[vp_idx].vha;

	return NULL;
}

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static inline void qlt_incr_num_pend_cmds(struct scsi_qla_host *vha)
{
	unsigned long flags;

	spin_lock_irqsave(&vha->hw->tgt.q_full_lock, flags);

	vha->hw->tgt.num_pend_cmds++;
	if (vha->hw->tgt.num_pend_cmds > vha->hw->qla_stats.stat_max_pend_cmds)
		vha->hw->qla_stats.stat_max_pend_cmds =
			vha->hw->tgt.num_pend_cmds;
	spin_unlock_irqrestore(&vha->hw->tgt.q_full_lock, flags);
}
static inline void qlt_decr_num_pend_cmds(struct scsi_qla_host *vha)
{
	unsigned long flags;

	spin_lock_irqsave(&vha->hw->tgt.q_full_lock, flags);
	vha->hw->tgt.num_pend_cmds--;
	spin_unlock_irqrestore(&vha->hw->tgt.q_full_lock, flags);
}

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static void qlt_24xx_atio_pkt_all_vps(struct scsi_qla_host *vha,
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	struct atio_from_isp *atio)
{
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	ql_dbg(ql_dbg_tgt, vha, 0xe072,
		"%s: qla_target(%d): type %x ox_id %04x\n",
		__func__, vha->vp_idx, atio->u.raw.entry_type,
		be16_to_cpu(atio->u.isp24.fcp_hdr.ox_id));

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	switch (atio->u.raw.entry_type) {
	case ATIO_TYPE7:
	{
		struct scsi_qla_host *host = qlt_find_host_by_d_id(vha,
		    atio->u.isp24.fcp_hdr.d_id);
		if (unlikely(NULL == host)) {
			ql_dbg(ql_dbg_tgt, vha, 0xe03e,
			    "qla_target(%d): Received ATIO_TYPE7 "
			    "with unknown d_id %x:%x:%x\n", vha->vp_idx,
			    atio->u.isp24.fcp_hdr.d_id[0],
			    atio->u.isp24.fcp_hdr.d_id[1],
			    atio->u.isp24.fcp_hdr.d_id[2]);
			break;
		}
		qlt_24xx_atio_pkt(host, atio);
		break;
	}

	case IMMED_NOTIFY_TYPE:
	{
		struct scsi_qla_host *host = vha;
		struct imm_ntfy_from_isp *entry =
		    (struct imm_ntfy_from_isp *)atio;

		if ((entry->u.isp24.vp_index != 0xFF) &&
		    (entry->u.isp24.nport_handle != 0xFFFF)) {
			host = qlt_find_host_by_vp_idx(vha,
			    entry->u.isp24.vp_index);
			if (unlikely(!host)) {
				ql_dbg(ql_dbg_tgt, vha, 0xe03f,
				    "qla_target(%d): Received "
				    "ATIO (IMMED_NOTIFY_TYPE) "
				    "with unknown vp_index %d\n",
				    vha->vp_idx, entry->u.isp24.vp_index);
				break;
			}
		}
		qlt_24xx_atio_pkt(host, atio);
		break;
	}

	default:
		ql_dbg(ql_dbg_tgt, vha, 0xe040,
		    "qla_target(%d): Received unknown ATIO atio "
		    "type %x\n", vha->vp_idx, atio->u.raw.entry_type);
		break;
	}

	return;
}

void qlt_response_pkt_all_vps(struct scsi_qla_host *vha, response_t *pkt)
{
	switch (pkt->entry_type) {
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	case CTIO_CRC2:
		ql_dbg(ql_dbg_tgt, vha, 0xe073,
			"qla_target(%d):%s: CRC2 Response pkt\n",
			vha->vp_idx, __func__);
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	case CTIO_TYPE7:
	{
		struct ctio7_from_24xx *entry = (struct ctio7_from_24xx *)pkt;
		struct scsi_qla_host *host = qlt_find_host_by_vp_idx(vha,
		    entry->vp_index);
		if (unlikely(!host)) {
			ql_dbg(ql_dbg_tgt, vha, 0xe041,
			    "qla_target(%d): Response pkt (CTIO_TYPE7) "
			    "received, with unknown vp_index %d\n",
			    vha->vp_idx, entry->vp_index);
			break;
		}
		qlt_response_pkt(host, pkt);
		break;
	}

	case IMMED_NOTIFY_TYPE:
	{
		struct scsi_qla_host *host = vha;
		struct imm_ntfy_from_isp *entry =
		    (struct imm_ntfy_from_isp *)pkt;

		host = qlt_find_host_by_vp_idx(vha, entry->u.isp24.vp_index);
		if (unlikely(!host)) {
			ql_dbg(ql_dbg_tgt, vha, 0xe042,
			    "qla_target(%d): Response pkt (IMMED_NOTIFY_TYPE) "
			    "received, with unknown vp_index %d\n",
			    vha->vp_idx, entry->u.isp24.vp_index);
			break;
		}
		qlt_response_pkt(host, pkt);
		break;
	}

	case NOTIFY_ACK_TYPE:
	{
		struct scsi_qla_host *host = vha;
		struct nack_to_isp *entry = (struct nack_to_isp *)pkt;

		if (0xFF != entry->u.isp24.vp_index) {
			host = qlt_find_host_by_vp_idx(vha,
			    entry->u.isp24.vp_index);
			if (unlikely(!host)) {
				ql_dbg(ql_dbg_tgt, vha, 0xe043,
				    "qla_target(%d): Response "
				    "pkt (NOTIFY_ACK_TYPE) "
				    "received, with unknown "
				    "vp_index %d\n", vha->vp_idx,
				    entry->u.isp24.vp_index);
				break;
			}
		}
		qlt_response_pkt(host, pkt);
		break;
	}

	case ABTS_RECV_24XX:
	{
		struct abts_recv_from_24xx *entry =
		    (struct abts_recv_from_24xx *)pkt;
		struct scsi_qla_host *host = qlt_find_host_by_vp_idx(vha,
		    entry->vp_index);
		if (unlikely(!host)) {
			ql_dbg(ql_dbg_tgt, vha, 0xe044,
			    "qla_target(%d): Response pkt "
			    "(ABTS_RECV_24XX) received, with unknown "
			    "vp_index %d\n", vha->vp_idx, entry->vp_index);
			break;
		}
		qlt_response_pkt(host, pkt);
		break;
	}

	case ABTS_RESP_24XX:
	{
		struct abts_resp_to_24xx *entry =
		    (struct abts_resp_to_24xx *)pkt;
		struct scsi_qla_host *host = qlt_find_host_by_vp_idx(vha,
		    entry->vp_index);
		if (unlikely(!host)) {
			ql_dbg(ql_dbg_tgt, vha, 0xe045,
			    "qla_target(%d): Response pkt "
			    "(ABTS_RECV_24XX) received, with unknown "
			    "vp_index %d\n", vha->vp_idx, entry->vp_index);
			break;
		}
		qlt_response_pkt(host, pkt);
		break;
	}

	default:
		qlt_response_pkt(vha, pkt);
		break;
	}

}

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/*
 * All qlt_plogi_ack_t operations are protected by hardware_lock
 */

/*
 * This is a zero-base ref-counting solution, since hardware_lock
 * guarantees that ref_count is not modified concurrently.
 * Upon successful return content of iocb is undefined
 */
static qlt_plogi_ack_t *
qlt_plogi_ack_find_add(struct scsi_qla_host *vha, port_id_t *id,
		       struct imm_ntfy_from_isp *iocb)
{
	qlt_plogi_ack_t *pla;

	list_for_each_entry(pla, &vha->plogi_ack_list, list) {
		if (pla->id.b24 == id->b24) {
			qlt_send_term_imm_notif(vha, &pla->iocb, 1);
			pla->iocb = *iocb;
			return pla;
		}
	}

	pla = kmem_cache_zalloc(qla_tgt_plogi_cachep, GFP_ATOMIC);
	if (!pla) {
		ql_dbg(ql_dbg_async, vha, 0x5088,
		       "qla_target(%d): Allocation of plogi_ack failed\n",
		       vha->vp_idx);
		return NULL;
	}

	pla->iocb = *iocb;
	pla->id = *id;
	list_add_tail(&pla->list, &vha->plogi_ack_list);

	return pla;
}

static void qlt_plogi_ack_unref(struct scsi_qla_host *vha, qlt_plogi_ack_t *pla)
{
	BUG_ON(!pla->ref_count);
	pla->ref_count--;

	if (pla->ref_count)
		return;

	ql_dbg(ql_dbg_async, vha, 0x5089,
	    "Sending PLOGI ACK to wwn %8phC s_id %02x:%02x:%02x loop_id %#04x"
	    " exch %#x ox_id %#x\n", pla->iocb.u.isp24.port_name,
	    pla->iocb.u.isp24.port_id[2], pla->iocb.u.isp24.port_id[1],
	    pla->iocb.u.isp24.port_id[0],
	    le16_to_cpu(pla->iocb.u.isp24.nport_handle),
	    pla->iocb.u.isp24.exchange_address, pla->iocb.ox_id);
	qlt_send_notify_ack(vha, &pla->iocb, 0, 0, 0, 0, 0, 0);

	list_del(&pla->list);
	kmem_cache_free(qla_tgt_plogi_cachep, pla);
}

static void
qlt_plogi_ack_link(struct scsi_qla_host *vha, qlt_plogi_ack_t *pla,
    struct qla_tgt_sess *sess, qlt_plogi_link_t link)
{
	/* Inc ref_count first because link might already be pointing at pla */
	pla->ref_count++;

	if (sess->plogi_link[link])
		qlt_plogi_ack_unref(vha, sess->plogi_link[link]);

	ql_dbg(ql_dbg_tgt_mgt, vha, 0xf097,
	    "Linking sess %p [%d] wwn %8phC with PLOGI ACK to wwn %8phC"
	    " s_id %02x:%02x:%02x, ref=%d\n", sess, link, sess->port_name,
	    pla->iocb.u.isp24.port_name, pla->iocb.u.isp24.port_id[2],
	    pla->iocb.u.isp24.port_id[1], pla->iocb.u.isp24.port_id[0],
	    pla->ref_count);

	sess->plogi_link[link] = pla;
}

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typedef struct {
	/* These fields must be initialized by the caller */
	port_id_t id;
	/*
	 * number of cmds dropped while we were waiting for
	 * initiator to ack LOGO initialize to 1 if LOGO is
	 * triggered by a command, otherwise, to 0
	 */
	int cmd_count;

	/* These fields are used by callee */
	struct list_head list;
} qlt_port_logo_t;

static void
qlt_send_first_logo(struct scsi_qla_host *vha, qlt_port_logo_t *logo)
{
	qlt_port_logo_t *tmp;
	int res;

	mutex_lock(&vha->vha_tgt.tgt_mutex);

	list_for_each_entry(tmp, &vha->logo_list, list) {
		if (tmp->id.b24 == logo->id.b24) {
			tmp->cmd_count += logo->cmd_count;
			mutex_unlock(&vha->vha_tgt.tgt_mutex);
			return;
		}
	}

	list_add_tail(&logo->list, &vha->logo_list);

	mutex_unlock(&vha->vha_tgt.tgt_mutex);

	res = qla24xx_els_dcmd_iocb(vha, ELS_DCMD_LOGO, logo->id);

	mutex_lock(&vha->vha_tgt.tgt_mutex);
	list_del(&logo->list);
	mutex_unlock(&vha->vha_tgt.tgt_mutex);

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	ql_dbg(ql_dbg_tgt_mgt, vha, 0xf098,
	    "Finished LOGO to %02x:%02x:%02x, dropped %d cmds, res = %#x\n",
	    logo->id.b.domain, logo->id.b.area, logo->id.b.al_pa,
	    logo->cmd_count, res);
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}

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static void qlt_free_session_done(struct work_struct *work)
{
	struct qla_tgt_sess *sess = container_of(work, struct qla_tgt_sess,
	    free_work);
	struct qla_tgt *tgt = sess->tgt;
	struct scsi_qla_host *vha = sess->vha;
	struct qla_hw_data *ha = vha->hw;
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	unsigned long flags;
	bool logout_started = false;
	fc_port_t fcport;

	ql_dbg(ql_dbg_tgt_mgt, vha, 0xf084,
		"%s: se_sess %p / sess %p from port %8phC loop_id %#04x"
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		" s_id %02x:%02x:%02x logout %d keep %d els_logo %d\n",
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		__func__, sess->se_sess, sess, sess->port_name, sess->loop_id,
		sess->s_id.b.domain, sess->s_id.b.area, sess->s_id.b.al_pa,
		sess->logout_on_delete, sess->keep_nport_handle,
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		sess->send_els_logo);
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	BUG_ON(!tgt);
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	if (sess->send_els_logo) {
		qlt_port_logo_t logo;
		logo.id = sess->s_id;
		logo.cmd_count = 0;
		qlt_send_first_logo(vha, &logo);
	}

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	if (sess->logout_on_delete) {
		int rc;

		memset(&fcport, 0, sizeof(fcport));
		fcport.loop_id = sess->loop_id;
		fcport.d_id = sess->s_id;
		memcpy(fcport.port_name, sess->port_name, WWN_SIZE);
		fcport.vha = vha;
		fcport.tgt_session = sess;

		rc = qla2x00_post_async_logout_work(vha, &fcport, NULL);
		if (rc != QLA_SUCCESS)
			ql_log(ql_log_warn, vha, 0xf085,
			       "Schedule logo failed sess %p rc %d\n",
			       sess, rc);
		else
			logout_started = true;
	}

567 568 569 570 571 572
	/*
	 * Release the target session for FC Nexus from fabric module code.
	 */
	if (sess->se_sess != NULL)
		ha->tgt.tgt_ops->free_session(sess);

573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592
	if (logout_started) {
		bool traced = false;

		while (!ACCESS_ONCE(sess->logout_completed)) {
			if (!traced) {
				ql_dbg(ql_dbg_tgt_mgt, vha, 0xf086,
					"%s: waiting for sess %p logout\n",
					__func__, sess);
				traced = true;
			}
			msleep(100);
		}

		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf087,
			"%s: sess %p logout completed\n",
			__func__, sess);
	}

	spin_lock_irqsave(&ha->hardware_lock, flags);

593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620
	{
		qlt_plogi_ack_t *own =
		    sess->plogi_link[QLT_PLOGI_LINK_SAME_WWN];
		qlt_plogi_ack_t *con =
		    sess->plogi_link[QLT_PLOGI_LINK_CONFLICT];

		if (con) {
			ql_dbg(ql_dbg_tgt_mgt, vha, 0xf099,
			    "se_sess %p / sess %p port %8phC is gone,"
			    " %s (ref=%d), releasing PLOGI for %8phC (ref=%d)\n",
			    sess->se_sess, sess, sess->port_name,
			    own ? "releasing own PLOGI" :
			    "no own PLOGI pending",
			    own ? own->ref_count : -1,
			    con->iocb.u.isp24.port_name, con->ref_count);
			qlt_plogi_ack_unref(vha, con);
		} else {
			ql_dbg(ql_dbg_tgt_mgt, vha, 0xf09a,
			    "se_sess %p / sess %p port %8phC is gone, %s (ref=%d)\n",
			    sess->se_sess, sess, sess->port_name,
			    own ? "releasing own PLOGI" :
			    "no own PLOGI pending",
			    own ? own->ref_count : -1);
		}

		if (own)
			qlt_plogi_ack_unref(vha, own);
	}
621 622 623 624 625

	list_del(&sess->sess_list_entry);

	spin_unlock_irqrestore(&ha->hardware_lock, flags);

626 627 628 629 630 631 632 633 634 635 636 637 638
	ql_dbg(ql_dbg_tgt_mgt, vha, 0xf001,
	    "Unregistration of sess %p finished\n", sess);

	kfree(sess);
	/*
	 * We need to protect against race, when tgt is freed before or
	 * inside wake_up()
	 */
	tgt->sess_count--;
	if (tgt->sess_count == 0)
		wake_up_all(&tgt->waitQ);
}

639
/* ha->tgt.sess_lock supposed to be held on entry */
640 641 642 643 644 645
void qlt_unreg_sess(struct qla_tgt_sess *sess)
{
	struct scsi_qla_host *vha = sess->vha;

	vha->hw->tgt.tgt_ops->clear_nacl_from_fcport_map(sess);

646 647 648
	if (!list_empty(&sess->del_list_entry))
		list_del_init(&sess->del_list_entry);
	sess->deleted = QLA_SESS_DELETION_IN_PROGRESS;
649 650 651 652 653 654

	INIT_WORK(&sess->free_work, qlt_free_session_done);
	schedule_work(&sess->free_work);
}
EXPORT_SYMBOL(qlt_unreg_sess);

655

656 657 658 659 660 661 662 663 664
static int qlt_reset(struct scsi_qla_host *vha, void *iocb, int mcmd)
{
	struct qla_hw_data *ha = vha->hw;
	struct qla_tgt_sess *sess = NULL;
	uint32_t unpacked_lun, lun = 0;
	uint16_t loop_id;
	int res = 0;
	struct imm_ntfy_from_isp *n = (struct imm_ntfy_from_isp *)iocb;
	struct atio_from_isp *a = (struct atio_from_isp *)iocb;
665
	unsigned long flags;
666 667 668 669

	loop_id = le16_to_cpu(n->u.isp24.nport_handle);
	if (loop_id == 0xFFFF) {
		/* Global event */
670
		atomic_inc(&vha->vha_tgt.qla_tgt->tgt_global_resets_count);
671
		spin_lock_irqsave(&ha->tgt.sess_lock, flags);
672
		qlt_clear_tgt_db(vha->vha_tgt.qla_tgt);
673
		spin_unlock_irqrestore(&ha->tgt.sess_lock, flags);
674
#if 0 /* FIXME: do we need to choose a session here? */
675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699
		if (!list_empty(&ha->tgt.qla_tgt->sess_list)) {
			sess = list_entry(ha->tgt.qla_tgt->sess_list.next,
			    typeof(*sess), sess_list_entry);
			switch (mcmd) {
			case QLA_TGT_NEXUS_LOSS_SESS:
				mcmd = QLA_TGT_NEXUS_LOSS;
				break;
			case QLA_TGT_ABORT_ALL_SESS:
				mcmd = QLA_TGT_ABORT_ALL;
				break;
			case QLA_TGT_NEXUS_LOSS:
			case QLA_TGT_ABORT_ALL:
				break;
			default:
				ql_dbg(ql_dbg_tgt, vha, 0xe046,
				    "qla_target(%d): Not allowed "
				    "command %x in %s", vha->vp_idx,
				    mcmd, __func__);
				sess = NULL;
				break;
			}
		} else
			sess = NULL;
#endif
	} else {
700
		spin_lock_irqsave(&ha->tgt.sess_lock, flags);
701
		sess = ha->tgt.tgt_ops->find_sess_by_loop_id(vha, loop_id);
702
		spin_unlock_irqrestore(&ha->tgt.sess_lock, flags);
703 704 705 706 707 708 709 710 711 712
	}

	ql_dbg(ql_dbg_tgt, vha, 0xe000,
	    "Using sess for qla_tgt_reset: %p\n", sess);
	if (!sess) {
		res = -ESRCH;
		return res;
	}

	ql_dbg(ql_dbg_tgt, vha, 0xe047,
713 714
	    "scsi(%ld): resetting (session %p from port %8phC mcmd %x, "
	    "loop_id %d)\n", vha->host_no, sess, sess->port_name,
715 716 717 718 719 720 721 722 723
	    mcmd, loop_id);

	lun = a->u.isp24.fcp_cmnd.lun;
	unpacked_lun = scsilun_to_int((struct scsi_lun *)&lun);

	return qlt_issue_task_mgmt(sess, unpacked_lun, mcmd,
	    iocb, QLA24XX_MGMT_SEND_NACK);
}

724
/* ha->tgt.sess_lock supposed to be held on entry */
725 726 727 728 729 730
static void qlt_schedule_sess_for_deletion(struct qla_tgt_sess *sess,
	bool immediate)
{
	struct qla_tgt *tgt = sess->tgt;
	uint32_t dev_loss_tmo = tgt->ha->port_down_retry_count + 5;

731 732 733 734 735 736 737
	if (sess->deleted) {
		/* Upgrade to unconditional deletion in case it was temporary */
		if (immediate && sess->deleted == QLA_SESS_DELETION_PENDING)
			list_del(&sess->del_list_entry);
		else
			return;
	}
738 739 740 741

	ql_dbg(ql_dbg_tgt, sess->vha, 0xe001,
	    "Scheduling sess %p for deletion\n", sess);

742
	if (immediate) {
743
		dev_loss_tmo = 0;
744 745 746 747 748 749
		sess->deleted = QLA_SESS_DELETION_IN_PROGRESS;
		list_add(&sess->del_list_entry, &tgt->del_sess_list);
	} else {
		sess->deleted = QLA_SESS_DELETION_PENDING;
		list_add_tail(&sess->del_list_entry, &tgt->del_sess_list);
	}
750 751 752 753

	sess->expires = jiffies + dev_loss_tmo * HZ;

	ql_dbg(ql_dbg_tgt, sess->vha, 0xe048,
754 755 756 757 758 759
	    "qla_target(%d): session for port %8phC (loop ID %d s_id %02x:%02x:%02x)"
	    " scheduled for deletion in %u secs (expires: %lu) immed: %d, logout: %d, gen: %#x\n",
	    sess->vha->vp_idx, sess->port_name, sess->loop_id,
	    sess->s_id.b.domain, sess->s_id.b.area, sess->s_id.b.al_pa,
	    dev_loss_tmo, sess->expires, immediate, sess->logout_on_delete,
	    sess->generation);
760 761

	if (immediate)
762
		mod_delayed_work(system_wq, &tgt->sess_del_work, 0);
763 764
	else
		schedule_delayed_work(&tgt->sess_del_work,
765
		    sess->expires - jiffies);
766 767
}

768
/* ha->tgt.sess_lock supposed to be held on entry */
769
static void qlt_clear_tgt_db(struct qla_tgt *tgt)
770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803
{
	struct qla_tgt_sess *sess;

	list_for_each_entry(sess, &tgt->sess_list, sess_list_entry)
		qlt_schedule_sess_for_deletion(sess, true);

	/* At this point tgt could be already dead */
}

static int qla24xx_get_loop_id(struct scsi_qla_host *vha, const uint8_t *s_id,
	uint16_t *loop_id)
{
	struct qla_hw_data *ha = vha->hw;
	dma_addr_t gid_list_dma;
	struct gid_list_info *gid_list;
	char *id_iter;
	int res, rc, i;
	uint16_t entries;

	gid_list = dma_alloc_coherent(&ha->pdev->dev, qla2x00_gid_list_size(ha),
	    &gid_list_dma, GFP_KERNEL);
	if (!gid_list) {
		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf044,
		    "qla_target(%d): DMA Alloc failed of %u\n",
		    vha->vp_idx, qla2x00_gid_list_size(ha));
		return -ENOMEM;
	}

	/* Get list of logged in devices */
	rc = qla2x00_get_id_list(vha, gid_list, gid_list_dma, &entries);
	if (rc != QLA_SUCCESS) {
		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf045,
		    "qla_target(%d): get_id_list() failed: %x\n",
		    vha->vp_idx, rc);
804
		res = -EBUSY;
805 806 807 808
		goto out_free_id_list;
	}

	id_iter = (char *)gid_list;
809
	res = -ENOENT;
810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827
	for (i = 0; i < entries; i++) {
		struct gid_list_info *gid = (struct gid_list_info *)id_iter;
		if ((gid->al_pa == s_id[2]) &&
		    (gid->area == s_id[1]) &&
		    (gid->domain == s_id[0])) {
			*loop_id = le16_to_cpu(gid->loop_id);
			res = 0;
			break;
		}
		id_iter += ha->gid_list_info_size;
	}

out_free_id_list:
	dma_free_coherent(&ha->pdev->dev, qla2x00_gid_list_size(ha),
	    gid_list, gid_list_dma);
	return res;
}

828
/* ha->tgt.sess_lock supposed to be held on entry */
829 830
static void qlt_undelete_sess(struct qla_tgt_sess *sess)
{
831
	BUG_ON(sess->deleted != QLA_SESS_DELETION_PENDING);
832

833
	list_del_init(&sess->del_list_entry);
834 835 836 837 838 839 840 841 842 843
	sess->deleted = 0;
}

static void qlt_del_sess_work_fn(struct delayed_work *work)
{
	struct qla_tgt *tgt = container_of(work, struct qla_tgt,
	    sess_del_work);
	struct scsi_qla_host *vha = tgt->vha;
	struct qla_hw_data *ha = vha->hw;
	struct qla_tgt_sess *sess;
844
	unsigned long flags, elapsed;
845

846
	spin_lock_irqsave(&ha->tgt.sess_lock, flags);
847 848 849
	while (!list_empty(&tgt->del_sess_list)) {
		sess = list_entry(tgt->del_sess_list.next, typeof(*sess),
		    del_list_entry);
850 851
		elapsed = jiffies;
		if (time_after_eq(elapsed, sess->expires)) {
852 853 854
			/* No turning back */
			list_del_init(&sess->del_list_entry);
			sess->deleted = QLA_SESS_DELETION_IN_PROGRESS;
855

856 857 858 859 860
			ql_dbg(ql_dbg_tgt_mgt, vha, 0xf004,
			    "Timeout: sess %p about to be deleted\n",
			    sess);
			ha->tgt.tgt_ops->shutdown_sess(sess);
			ha->tgt.tgt_ops->put_sess(sess);
861 862
		} else {
			schedule_delayed_work(&tgt->sess_del_work,
863
			    sess->expires - elapsed);
864 865 866
			break;
		}
	}
867
	spin_unlock_irqrestore(&ha->tgt.sess_lock, flags);
868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884
}

/*
 * Adds an extra ref to allow to drop hw lock after adding sess to the list.
 * Caller must put it.
 */
static struct qla_tgt_sess *qlt_create_sess(
	struct scsi_qla_host *vha,
	fc_port_t *fcport,
	bool local)
{
	struct qla_hw_data *ha = vha->hw;
	struct qla_tgt_sess *sess;
	unsigned long flags;
	unsigned char be_sid[3];

	/* Check to avoid double sessions */
885
	spin_lock_irqsave(&ha->tgt.sess_lock, flags);
886
	list_for_each_entry(sess, &vha->vha_tgt.qla_tgt->sess_list,
887 888 889 890 891 892 893 894 895 896 897
				sess_list_entry) {
		if (!memcmp(sess->port_name, fcport->port_name, WWN_SIZE)) {
			ql_dbg(ql_dbg_tgt_mgt, vha, 0xf005,
			    "Double sess %p found (s_id %x:%x:%x, "
			    "loop_id %d), updating to d_id %x:%x:%x, "
			    "loop_id %d", sess, sess->s_id.b.domain,
			    sess->s_id.b.al_pa, sess->s_id.b.area,
			    sess->loop_id, fcport->d_id.b.domain,
			    fcport->d_id.b.al_pa, fcport->d_id.b.area,
			    fcport->loop_id);

898 899
			/* Cannot undelete at this point */
			if (sess->deleted == QLA_SESS_DELETION_IN_PROGRESS) {
900
				spin_unlock_irqrestore(&ha->tgt.sess_lock,
901 902 903 904
				    flags);
				return NULL;
			}

905 906 907 908
			if (sess->deleted)
				qlt_undelete_sess(sess);

			kref_get(&sess->se_sess->sess_kref);
909 910 911
			ha->tgt.tgt_ops->update_sess(sess, fcport->d_id, fcport->loop_id,
						(fcport->flags & FCF_CONF_COMP_SUPPORTED));

912 913
			if (sess->local && !local)
				sess->local = 0;
914 915 916

			qlt_do_generation_tick(vha, &sess->generation);

917
			spin_unlock_irqrestore(&ha->tgt.sess_lock, flags);
918 919 920 921

			return sess;
		}
	}
922
	spin_unlock_irqrestore(&ha->tgt.sess_lock, flags);
923 924 925 926

	sess = kzalloc(sizeof(*sess), GFP_KERNEL);
	if (!sess) {
		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf04a,
927 928 929
		    "qla_target(%u): session allocation failed, all commands "
		    "from port %8phC will be refused", vha->vp_idx,
		    fcport->port_name);
930 931 932

		return NULL;
	}
933
	sess->tgt = vha->vha_tgt.qla_tgt;
934 935 936 937
	sess->vha = vha;
	sess->s_id = fcport->d_id;
	sess->loop_id = fcport->loop_id;
	sess->local = local;
938 939 940 941 942 943 944 945
	INIT_LIST_HEAD(&sess->del_list_entry);

	/* Under normal circumstances we want to logout from firmware when
	 * session eventually ends and release corresponding nport handle.
	 * In the exception cases (e.g. when new PLOGI is waiting) corresponding
	 * code will adjust these flags as necessary. */
	sess->logout_on_delete = 1;
	sess->keep_nport_handle = 0;
946 947 948

	ql_dbg(ql_dbg_tgt_mgt, vha, 0xf006,
	    "Adding sess %p to tgt %p via ->check_initiator_node_acl()\n",
949
	    sess, vha->vha_tgt.qla_tgt);
950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966

	be_sid[0] = sess->s_id.b.domain;
	be_sid[1] = sess->s_id.b.area;
	be_sid[2] = sess->s_id.b.al_pa;
	/*
	 * Determine if this fc_port->port_name is allowed to access
	 * target mode using explict NodeACLs+MappedLUNs, or using
	 * TPG demo mode.  If this is successful a target mode FC nexus
	 * is created.
	 */
	if (ha->tgt.tgt_ops->check_initiator_node_acl(vha,
	    &fcport->port_name[0], sess, &be_sid[0], fcport->loop_id) < 0) {
		kfree(sess);
		return NULL;
	}
	/*
	 * Take an extra reference to ->sess_kref here to handle qla_tgt_sess
967
	 * access across ->tgt.sess_lock reaquire.
968 969 970
	 */
	kref_get(&sess->se_sess->sess_kref);

971
	sess->conf_compl_supported = (fcport->flags & FCF_CONF_COMP_SUPPORTED);
972 973 974
	BUILD_BUG_ON(sizeof(sess->port_name) != sizeof(fcport->port_name));
	memcpy(sess->port_name, fcport->port_name, sizeof(sess->port_name));

975
	spin_lock_irqsave(&ha->tgt.sess_lock, flags);
976 977
	list_add_tail(&sess->sess_list_entry, &vha->vha_tgt.qla_tgt->sess_list);
	vha->vha_tgt.qla_tgt->sess_count++;
978
	qlt_do_generation_tick(vha, &sess->generation);
979
	spin_unlock_irqrestore(&ha->tgt.sess_lock, flags);
980 981

	ql_dbg(ql_dbg_tgt_mgt, vha, 0xf04b,
982 983 984 985 986
	    "qla_target(%d): %ssession for wwn %8phC (loop_id %d, "
	    "s_id %x:%x:%x, confirmed completion %ssupported) added\n",
	    vha->vp_idx, local ?  "local " : "", fcport->port_name,
	    fcport->loop_id, sess->s_id.b.domain, sess->s_id.b.area,
	    sess->s_id.b.al_pa, sess->conf_compl_supported ?  "" : "not ");
987 988 989 990 991

	return sess;
}

/*
992
 * Called from qla2x00_reg_remote_port()
993 994 995 996
 */
void qlt_fc_port_added(struct scsi_qla_host *vha, fc_port_t *fcport)
{
	struct qla_hw_data *ha = vha->hw;
997
	struct qla_tgt *tgt = vha->vha_tgt.qla_tgt;
998 999 1000 1001 1002 1003 1004 1005 1006
	struct qla_tgt_sess *sess;
	unsigned long flags;

	if (!vha->hw->tgt.tgt_ops)
		return;

	if (!tgt || (fcport->port_type != FCT_INITIATOR))
		return;

1007 1008 1009
	if (qla_ini_mode_enabled(vha))
		return;

1010
	spin_lock_irqsave(&ha->tgt.sess_lock, flags);
1011
	if (tgt->tgt_stop) {
1012
		spin_unlock_irqrestore(&ha->tgt.sess_lock, flags);
1013 1014 1015 1016
		return;
	}
	sess = qlt_find_sess_by_port_name(tgt, fcport->port_name);
	if (!sess) {
1017
		spin_unlock_irqrestore(&ha->tgt.sess_lock, flags);
1018

1019
		mutex_lock(&vha->vha_tgt.tgt_mutex);
1020
		sess = qlt_create_sess(vha, fcport, false);
1021
		mutex_unlock(&vha->vha_tgt.tgt_mutex);
1022

1023
		spin_lock_irqsave(&ha->tgt.sess_lock, flags);
1024 1025
	} else if (sess->deleted == QLA_SESS_DELETION_IN_PROGRESS) {
		/* Point of no return */
1026
		spin_unlock_irqrestore(&ha->tgt.sess_lock, flags);
1027
		return;
1028 1029 1030 1031 1032 1033 1034
	} else {
		kref_get(&sess->se_sess->sess_kref);

		if (sess->deleted) {
			qlt_undelete_sess(sess);

			ql_dbg(ql_dbg_tgt_mgt, vha, 0xf04c,
1035 1036 1037
			    "qla_target(%u): %ssession for port %8phC "
			    "(loop ID %d) reappeared\n", vha->vp_idx,
			    sess->local ? "local " : "", sess->port_name,
1038 1039 1040 1041 1042
			    sess->loop_id);

			ql_dbg(ql_dbg_tgt_mgt, vha, 0xf007,
			    "Reappeared sess %p\n", sess);
		}
1043 1044
		ha->tgt.tgt_ops->update_sess(sess, fcport->d_id, fcport->loop_id,
					(fcport->flags & FCF_CONF_COMP_SUPPORTED));
1045 1046 1047 1048 1049
	}

	if (sess && sess->local) {
		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf04d,
		    "qla_target(%u): local session for "
1050 1051
		    "port %8phC (loop ID %d) became global\n", vha->vp_idx,
		    fcport->port_name, sess->loop_id);
1052 1053 1054
		sess->local = 0;
	}
	ha->tgt.tgt_ops->put_sess(sess);
1055
	spin_unlock_irqrestore(&ha->tgt.sess_lock, flags);
1056 1057
}

1058 1059 1060 1061 1062 1063
/*
 * max_gen - specifies maximum session generation
 * at which this deletion requestion is still valid
 */
void
qlt_fc_port_deleted(struct scsi_qla_host *vha, fc_port_t *fcport, int max_gen)
1064
{
1065
	struct qla_tgt *tgt = vha->vha_tgt.qla_tgt;
1066
	struct qla_tgt_sess *sess;
1067
	unsigned long flags;
1068 1069 1070 1071

	if (!vha->hw->tgt.tgt_ops)
		return;

1072
	if (!tgt)
1073 1074
		return;

1075
	spin_lock_irqsave(&vha->hw->tgt.sess_lock, flags);
1076
	if (tgt->tgt_stop) {
1077
		spin_unlock_irqrestore(&vha->hw->tgt.sess_lock, flags);
1078 1079 1080 1081
		return;
	}
	sess = qlt_find_sess_by_port_name(tgt, fcport->port_name);
	if (!sess) {
1082
		spin_unlock_irqrestore(&vha->hw->tgt.sess_lock, flags);
1083 1084 1085
		return;
	}

1086
	if (max_gen - sess->generation < 0) {
1087
		spin_unlock_irqrestore(&vha->hw->tgt.sess_lock, flags);
1088 1089 1090 1091 1092 1093 1094 1095
		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf092,
		    "Ignoring stale deletion request for se_sess %p / sess %p"
		    " for port %8phC, req_gen %d, sess_gen %d\n",
		    sess->se_sess, sess, sess->port_name, max_gen,
		    sess->generation);
		return;
	}

1096 1097 1098 1099
	ql_dbg(ql_dbg_tgt_mgt, vha, 0xf008, "qla_tgt_fc_port_deleted %p", sess);

	sess->local = 1;
	qlt_schedule_sess_for_deletion(sess, false);
1100
	spin_unlock_irqrestore(&vha->hw->tgt.sess_lock, flags);
1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122
}

static inline int test_tgt_sess_count(struct qla_tgt *tgt)
{
	struct qla_hw_data *ha = tgt->ha;
	unsigned long flags;
	int res;
	/*
	 * We need to protect against race, when tgt is freed before or
	 * inside wake_up()
	 */
	spin_lock_irqsave(&ha->hardware_lock, flags);
	ql_dbg(ql_dbg_tgt, tgt->vha, 0xe002,
	    "tgt %p, empty(sess_list)=%d sess_count=%d\n",
	    tgt, list_empty(&tgt->sess_list), tgt->sess_count);
	res = (tgt->sess_count == 0);
	spin_unlock_irqrestore(&ha->hardware_lock, flags);

	return res;
}

/* Called by tcm_qla2xxx configfs code */
1123
int qlt_stop_phase1(struct qla_tgt *tgt)
1124 1125 1126 1127 1128
{
	struct scsi_qla_host *vha = tgt->vha;
	struct qla_hw_data *ha = tgt->ha;
	unsigned long flags;

1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143
	mutex_lock(&qla_tgt_mutex);
	if (!vha->fc_vport) {
		struct Scsi_Host *sh = vha->host;
		struct fc_host_attrs *fc_host = shost_to_fc_host(sh);
		bool npiv_vports;

		spin_lock_irqsave(sh->host_lock, flags);
		npiv_vports = (fc_host->npiv_vports_inuse);
		spin_unlock_irqrestore(sh->host_lock, flags);

		if (npiv_vports) {
			mutex_unlock(&qla_tgt_mutex);
			return -EPERM;
		}
	}
1144 1145 1146
	if (tgt->tgt_stop || tgt->tgt_stopped) {
		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf04e,
		    "Already in tgt->tgt_stop or tgt_stopped state\n");
1147 1148
		mutex_unlock(&qla_tgt_mutex);
		return -EPERM;
1149 1150 1151 1152 1153 1154 1155 1156
	}

	ql_dbg(ql_dbg_tgt, vha, 0xe003, "Stopping target for host %ld(%p)\n",
	    vha->host_no, vha);
	/*
	 * Mutex needed to sync with qla_tgt_fc_port_[added,deleted].
	 * Lock is needed, because we still can get an incoming packet.
	 */
1157
	mutex_lock(&vha->vha_tgt.tgt_mutex);
1158
	spin_lock_irqsave(&ha->tgt.sess_lock, flags);
1159
	tgt->tgt_stop = 1;
1160
	qlt_clear_tgt_db(tgt);
1161
	spin_unlock_irqrestore(&ha->tgt.sess_lock, flags);
1162
	mutex_unlock(&vha->vha_tgt.tgt_mutex);
1163
	mutex_unlock(&qla_tgt_mutex);
1164

1165
	flush_delayed_work(&tgt->sess_del_work);
1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189

	ql_dbg(ql_dbg_tgt_mgt, vha, 0xf009,
	    "Waiting for sess works (tgt %p)", tgt);
	spin_lock_irqsave(&tgt->sess_work_lock, flags);
	while (!list_empty(&tgt->sess_works_list)) {
		spin_unlock_irqrestore(&tgt->sess_work_lock, flags);
		flush_scheduled_work();
		spin_lock_irqsave(&tgt->sess_work_lock, flags);
	}
	spin_unlock_irqrestore(&tgt->sess_work_lock, flags);

	ql_dbg(ql_dbg_tgt_mgt, vha, 0xf00a,
	    "Waiting for tgt %p: list_empty(sess_list)=%d "
	    "sess_count=%d\n", tgt, list_empty(&tgt->sess_list),
	    tgt->sess_count);

	wait_event(tgt->waitQ, test_tgt_sess_count(tgt));

	/* Big hammer */
	if (!ha->flags.host_shutting_down && qla_tgt_mode_enabled(vha))
		qlt_disable_vha(vha);

	/* Wait for sessions to clear out (just in case) */
	wait_event(tgt->waitQ, test_tgt_sess_count(tgt));
1190
	return 0;
1191 1192 1193 1194 1195 1196 1197
}
EXPORT_SYMBOL(qlt_stop_phase1);

/* Called by tcm_qla2xxx configfs code */
void qlt_stop_phase2(struct qla_tgt *tgt)
{
	struct qla_hw_data *ha = tgt->ha;
1198
	scsi_qla_host_t *vha = pci_get_drvdata(ha->pdev);
1199 1200 1201
	unsigned long flags;

	if (tgt->tgt_stopped) {
1202
		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf04f,
1203 1204 1205 1206 1207
		    "Already in tgt->tgt_stopped state\n");
		dump_stack();
		return;
	}

1208
	ql_dbg(ql_dbg_tgt_mgt, vha, 0xf00b,
1209 1210 1211
	    "Waiting for %d IRQ commands to complete (tgt %p)",
	    tgt->irq_cmd_count, tgt);

1212
	mutex_lock(&vha->vha_tgt.tgt_mutex);
1213 1214 1215 1216 1217 1218 1219 1220 1221
	spin_lock_irqsave(&ha->hardware_lock, flags);
	while (tgt->irq_cmd_count != 0) {
		spin_unlock_irqrestore(&ha->hardware_lock, flags);
		udelay(2);
		spin_lock_irqsave(&ha->hardware_lock, flags);
	}
	tgt->tgt_stop = 0;
	tgt->tgt_stopped = 1;
	spin_unlock_irqrestore(&ha->hardware_lock, flags);
1222
	mutex_unlock(&vha->vha_tgt.tgt_mutex);
1223

1224
	ql_dbg(ql_dbg_tgt_mgt, vha, 0xf00c, "Stop of tgt %p finished",
1225 1226 1227 1228 1229
	    tgt);
}
EXPORT_SYMBOL(qlt_stop_phase2);

/* Called from qlt_remove_target() -> qla2x00_remove_one() */
1230
static void qlt_release(struct qla_tgt *tgt)
1231
{
1232
	scsi_qla_host_t *vha = tgt->vha;
1233

1234
	if ((vha->vha_tgt.qla_tgt != NULL) && !tgt->tgt_stopped)
1235 1236
		qlt_stop_phase2(tgt);

1237
	vha->vha_tgt.qla_tgt = NULL;
1238

1239
	ql_dbg(ql_dbg_tgt_mgt, vha, 0xf00d,
1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302
	    "Release of tgt %p finished\n", tgt);

	kfree(tgt);
}

/* ha->hardware_lock supposed to be held on entry */
static int qlt_sched_sess_work(struct qla_tgt *tgt, int type,
	const void *param, unsigned int param_size)
{
	struct qla_tgt_sess_work_param *prm;
	unsigned long flags;

	prm = kzalloc(sizeof(*prm), GFP_ATOMIC);
	if (!prm) {
		ql_dbg(ql_dbg_tgt_mgt, tgt->vha, 0xf050,
		    "qla_target(%d): Unable to create session "
		    "work, command will be refused", 0);
		return -ENOMEM;
	}

	ql_dbg(ql_dbg_tgt_mgt, tgt->vha, 0xf00e,
	    "Scheduling work (type %d, prm %p)"
	    " to find session for param %p (size %d, tgt %p)\n",
	    type, prm, param, param_size, tgt);

	prm->type = type;
	memcpy(&prm->tm_iocb, param, param_size);

	spin_lock_irqsave(&tgt->sess_work_lock, flags);
	list_add_tail(&prm->sess_works_list_entry, &tgt->sess_works_list);
	spin_unlock_irqrestore(&tgt->sess_work_lock, flags);

	schedule_work(&tgt->sess_work);

	return 0;
}

/*
 * ha->hardware_lock supposed to be held on entry. Might drop it, then reaquire
 */
static void qlt_send_notify_ack(struct scsi_qla_host *vha,
	struct imm_ntfy_from_isp *ntfy,
	uint32_t add_flags, uint16_t resp_code, int resp_code_valid,
	uint16_t srr_flags, uint16_t srr_reject_code, uint8_t srr_explan)
{
	struct qla_hw_data *ha = vha->hw;
	request_t *pkt;
	struct nack_to_isp *nack;

	ql_dbg(ql_dbg_tgt, vha, 0xe004, "Sending NOTIFY_ACK (ha=%p)\n", ha);

	/* Send marker if required */
	if (qlt_issue_marker(vha, 1) != QLA_SUCCESS)
		return;

	pkt = (request_t *)qla2x00_alloc_iocbs(vha, NULL);
	if (!pkt) {
		ql_dbg(ql_dbg_tgt, vha, 0xe049,
		    "qla_target(%d): %s failed: unable to allocate "
		    "request packet\n", vha->vp_idx, __func__);
		return;
	}

1303 1304
	if (vha->vha_tgt.qla_tgt != NULL)
		vha->vha_tgt.qla_tgt->notify_ack_expected++;
1305 1306 1307 1308 1309 1310 1311 1312 1313 1314

	pkt->entry_type = NOTIFY_ACK_TYPE;
	pkt->entry_count = 1;

	nack = (struct nack_to_isp *)pkt;
	nack->ox_id = ntfy->ox_id;

	nack->u.isp24.nport_handle = ntfy->u.isp24.nport_handle;
	if (le16_to_cpu(ntfy->u.isp24.status) == IMM_NTFY_ELS) {
		nack->u.isp24.flags = ntfy->u.isp24.flags &
1315
			cpu_to_le32(NOTIFY24XX_FLAGS_PUREX_IOCB);
1316 1317 1318 1319
	}
	nack->u.isp24.srr_rx_id = ntfy->u.isp24.srr_rx_id;
	nack->u.isp24.status = ntfy->u.isp24.status;
	nack->u.isp24.status_subcode = ntfy->u.isp24.status_subcode;
1320
	nack->u.isp24.fw_handle = ntfy->u.isp24.fw_handle;
1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332
	nack->u.isp24.exchange_address = ntfy->u.isp24.exchange_address;
	nack->u.isp24.srr_rel_offs = ntfy->u.isp24.srr_rel_offs;
	nack->u.isp24.srr_ui = ntfy->u.isp24.srr_ui;
	nack->u.isp24.srr_flags = cpu_to_le16(srr_flags);
	nack->u.isp24.srr_reject_code = srr_reject_code;
	nack->u.isp24.srr_reject_code_expl = srr_explan;
	nack->u.isp24.vp_index = ntfy->u.isp24.vp_index;

	ql_dbg(ql_dbg_tgt, vha, 0xe005,
	    "qla_target(%d): Sending 24xx Notify Ack %d\n",
	    vha->vp_idx, nack->u.isp24.status);

1333 1334
	/* Memory Barrier */
	wmb();
1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357
	qla2x00_start_iocbs(vha, vha->req);
}

/*
 * ha->hardware_lock supposed to be held on entry. Might drop it, then reaquire
 */
static void qlt_24xx_send_abts_resp(struct scsi_qla_host *vha,
	struct abts_recv_from_24xx *abts, uint32_t status,
	bool ids_reversed)
{
	struct qla_hw_data *ha = vha->hw;
	struct abts_resp_to_24xx *resp;
	uint32_t f_ctl;
	uint8_t *p;

	ql_dbg(ql_dbg_tgt, vha, 0xe006,
	    "Sending task mgmt ABTS response (ha=%p, atio=%p, status=%x\n",
	    ha, abts, status);

	/* Send marker if required */
	if (qlt_issue_marker(vha, 1) != QLA_SUCCESS)
		return;

1358
	resp = (struct abts_resp_to_24xx *)qla2x00_alloc_iocbs_ready(vha, NULL);
1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372
	if (!resp) {
		ql_dbg(ql_dbg_tgt, vha, 0xe04a,
		    "qla_target(%d): %s failed: unable to allocate "
		    "request packet", vha->vp_idx, __func__);
		return;
	}

	resp->entry_type = ABTS_RESP_24XX;
	resp->entry_count = 1;
	resp->nport_handle = abts->nport_handle;
	resp->vp_index = vha->vp_idx;
	resp->sof_type = abts->sof_type;
	resp->exchange_address = abts->exchange_address;
	resp->fcp_hdr_le = abts->fcp_hdr_le;
1373
	f_ctl = cpu_to_le32(F_CTL_EXCH_CONTEXT_RESP |
1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409
	    F_CTL_LAST_SEQ | F_CTL_END_SEQ |
	    F_CTL_SEQ_INITIATIVE);
	p = (uint8_t *)&f_ctl;
	resp->fcp_hdr_le.f_ctl[0] = *p++;
	resp->fcp_hdr_le.f_ctl[1] = *p++;
	resp->fcp_hdr_le.f_ctl[2] = *p;
	if (ids_reversed) {
		resp->fcp_hdr_le.d_id[0] = abts->fcp_hdr_le.d_id[0];
		resp->fcp_hdr_le.d_id[1] = abts->fcp_hdr_le.d_id[1];
		resp->fcp_hdr_le.d_id[2] = abts->fcp_hdr_le.d_id[2];
		resp->fcp_hdr_le.s_id[0] = abts->fcp_hdr_le.s_id[0];
		resp->fcp_hdr_le.s_id[1] = abts->fcp_hdr_le.s_id[1];
		resp->fcp_hdr_le.s_id[2] = abts->fcp_hdr_le.s_id[2];
	} else {
		resp->fcp_hdr_le.d_id[0] = abts->fcp_hdr_le.s_id[0];
		resp->fcp_hdr_le.d_id[1] = abts->fcp_hdr_le.s_id[1];
		resp->fcp_hdr_le.d_id[2] = abts->fcp_hdr_le.s_id[2];
		resp->fcp_hdr_le.s_id[0] = abts->fcp_hdr_le.d_id[0];
		resp->fcp_hdr_le.s_id[1] = abts->fcp_hdr_le.d_id[1];
		resp->fcp_hdr_le.s_id[2] = abts->fcp_hdr_le.d_id[2];
	}
	resp->exchange_addr_to_abort = abts->exchange_addr_to_abort;
	if (status == FCP_TMF_CMPL) {
		resp->fcp_hdr_le.r_ctl = R_CTL_BASIC_LINK_SERV | R_CTL_B_ACC;
		resp->payload.ba_acct.seq_id_valid = SEQ_ID_INVALID;
		resp->payload.ba_acct.low_seq_cnt = 0x0000;
		resp->payload.ba_acct.high_seq_cnt = 0xFFFF;
		resp->payload.ba_acct.ox_id = abts->fcp_hdr_le.ox_id;
		resp->payload.ba_acct.rx_id = abts->fcp_hdr_le.rx_id;
	} else {
		resp->fcp_hdr_le.r_ctl = R_CTL_BASIC_LINK_SERV | R_CTL_B_RJT;
		resp->payload.ba_rjt.reason_code =
			BA_RJT_REASON_CODE_UNABLE_TO_PERFORM;
		/* Other bytes are zero */
	}

1410
	vha->vha_tgt.qla_tgt->abts_resp_expected++;
1411

1412 1413
	/* Memory Barrier */
	wmb();
1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430
	qla2x00_start_iocbs(vha, vha->req);
}

/*
 * ha->hardware_lock supposed to be held on entry. Might drop it, then reaquire
 */
static void qlt_24xx_retry_term_exchange(struct scsi_qla_host *vha,
	struct abts_resp_from_24xx_fw *entry)
{
	struct ctio7_to_24xx *ctio;

	ql_dbg(ql_dbg_tgt, vha, 0xe007,
	    "Sending retry TERM EXCH CTIO7 (ha=%p)\n", vha->hw);
	/* Send marker if required */
	if (qlt_issue_marker(vha, 1) != QLA_SUCCESS)
		return;

1431
	ctio = (struct ctio7_to_24xx *)qla2x00_alloc_iocbs_ready(vha, NULL);
1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447
	if (ctio == NULL) {
		ql_dbg(ql_dbg_tgt, vha, 0xe04b,
		    "qla_target(%d): %s failed: unable to allocate "
		    "request packet\n", vha->vp_idx, __func__);
		return;
	}

	/*
	 * We've got on entrance firmware's response on by us generated
	 * ABTS response. So, in it ID fields are reversed.
	 */

	ctio->entry_type = CTIO_TYPE7;
	ctio->entry_count = 1;
	ctio->nport_handle = entry->nport_handle;
	ctio->handle = QLA_TGT_SKIP_HANDLE |	CTIO_COMPLETION_HANDLE_MARK;
1448
	ctio->timeout = cpu_to_le16(QLA_TGT_TIMEOUT);
1449 1450 1451 1452 1453
	ctio->vp_index = vha->vp_idx;
	ctio->initiator_id[0] = entry->fcp_hdr_le.d_id[0];
	ctio->initiator_id[1] = entry->fcp_hdr_le.d_id[1];
	ctio->initiator_id[2] = entry->fcp_hdr_le.d_id[2];
	ctio->exchange_addr = entry->exchange_addr_to_abort;
1454 1455
	ctio->u.status1.flags = cpu_to_le16(CTIO7_FLAGS_STATUS_MODE_1 |
					    CTIO7_FLAGS_TERMINATE);
1456
	ctio->u.status1.ox_id = cpu_to_le16(entry->fcp_hdr_le.ox_id);
1457

1458 1459
	/* Memory Barrier */
	wmb();
1460 1461 1462 1463 1464 1465
	qla2x00_start_iocbs(vha, vha->req);

	qlt_24xx_send_abts_resp(vha, (struct abts_recv_from_24xx *)entry,
	    FCP_TMF_CMPL, true);
}

1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482
static int abort_cmd_for_tag(struct scsi_qla_host *vha, uint32_t tag)
{
	struct qla_tgt_sess_op *op;
	struct qla_tgt_cmd *cmd;

	spin_lock(&vha->cmd_list_lock);

	list_for_each_entry(op, &vha->qla_sess_op_cmd_list, cmd_list) {
		if (tag == op->atio.u.isp24.exchange_addr) {
			op->aborted = true;
			spin_unlock(&vha->cmd_list_lock);
			return 1;
		}
	}

	list_for_each_entry(cmd, &vha->qla_cmd_list, cmd_list) {
		if (tag == cmd->atio.u.isp24.exchange_addr) {
1483
			cmd->aborted = 1;
1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524
			spin_unlock(&vha->cmd_list_lock);
			return 1;
		}
	}

	spin_unlock(&vha->cmd_list_lock);
	return 0;
}

/* drop cmds for the given lun
 * XXX only looks for cmds on the port through which lun reset was recieved
 * XXX does not go through the list of other port (which may have cmds
 *     for the same lun)
 */
static void abort_cmds_for_lun(struct scsi_qla_host *vha,
				uint32_t lun, uint8_t *s_id)
{
	struct qla_tgt_sess_op *op;
	struct qla_tgt_cmd *cmd;
	uint32_t key;

	key = sid_to_key(s_id);
	spin_lock(&vha->cmd_list_lock);
	list_for_each_entry(op, &vha->qla_sess_op_cmd_list, cmd_list) {
		uint32_t op_key;
		uint32_t op_lun;

		op_key = sid_to_key(op->atio.u.isp24.fcp_hdr.s_id);
		op_lun = scsilun_to_int(
			(struct scsi_lun *)&op->atio.u.isp24.fcp_cmnd.lun);
		if (op_key == key && op_lun == lun)
			op->aborted = true;
	}
	list_for_each_entry(cmd, &vha->qla_cmd_list, cmd_list) {
		uint32_t cmd_key;
		uint32_t cmd_lun;

		cmd_key = sid_to_key(cmd->atio.u.isp24.fcp_hdr.s_id);
		cmd_lun = scsilun_to_int(
			(struct scsi_lun *)&cmd->atio.u.isp24.fcp_cmnd.lun);
		if (cmd_key == key && cmd_lun == lun)
1525
			cmd->aborted = 1;
1526 1527 1528 1529
	}
	spin_unlock(&vha->cmd_list_lock);
}

1530 1531 1532 1533 1534
/* ha->hardware_lock supposed to be held on entry */
static int __qlt_24xx_handle_abts(struct scsi_qla_host *vha,
	struct abts_recv_from_24xx *abts, struct qla_tgt_sess *sess)
{
	struct qla_hw_data *ha = vha->hw;
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	struct se_session *se_sess = sess->se_sess;
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	struct qla_tgt_mgmt_cmd *mcmd;
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	struct se_cmd *se_cmd;
	u32 lun = 0;
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	int rc;
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	bool found_lun = false;

	spin_lock(&se_sess->sess_cmd_lock);
	list_for_each_entry(se_cmd, &se_sess->sess_cmd_list, se_cmd_list) {
		struct qla_tgt_cmd *cmd =
			container_of(se_cmd, struct qla_tgt_cmd, se_cmd);
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		if (se_cmd->tag == abts->exchange_addr_to_abort) {
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			lun = cmd->unpacked_lun;
			found_lun = true;
			break;
		}
	}
	spin_unlock(&se_sess->sess_cmd_lock);

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	/* cmd not in LIO lists, look in qla list */
	if (!found_lun) {
		if (abort_cmd_for_tag(vha, abts->exchange_addr_to_abort)) {
			/* send TASK_ABORT response immediately */
			qlt_24xx_send_abts_resp(vha, abts, FCP_TMF_CMPL, false);
			return 0;
		} else {
			ql_dbg(ql_dbg_tgt_mgt, vha, 0xf081,
			    "unable to find cmd in driver or LIO for tag 0x%x\n",
			    abts->exchange_addr_to_abort);
			return -ENOENT;
		}
	}
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	ql_dbg(ql_dbg_tgt_mgt, vha, 0xf00f,
	    "qla_target(%d): task abort (tag=%d)\n",
	    vha->vp_idx, abts->exchange_addr_to_abort);

	mcmd = mempool_alloc(qla_tgt_mgmt_cmd_mempool, GFP_ATOMIC);
	if (mcmd == NULL) {
		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf051,
		    "qla_target(%d): %s: Allocation of ABORT cmd failed",
		    vha->vp_idx, __func__);
		return -ENOMEM;
	}
	memset(mcmd, 0, sizeof(*mcmd));

	mcmd->sess = sess;
	memcpy(&mcmd->orig_iocb.abts, abts, sizeof(mcmd->orig_iocb.abts));
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	mcmd->reset_count = vha->hw->chip_reset;
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	rc = ha->tgt.tgt_ops->handle_tmr(mcmd, lun, TMR_ABORT_TASK,
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	    abts->exchange_addr_to_abort);
	if (rc != 0) {
		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf052,
		    "qla_target(%d):  tgt_ops->handle_tmr()"
		    " failed: %d", vha->vp_idx, rc);
		mempool_free(mcmd, qla_tgt_mgmt_cmd_mempool);
		return -EFAULT;
	}

	return 0;
}

/*
 * ha->hardware_lock supposed to be held on entry. Might drop it, then reaquire
 */
static void qlt_24xx_handle_abts(struct scsi_qla_host *vha,
	struct abts_recv_from_24xx *abts)
{
	struct qla_hw_data *ha = vha->hw;
	struct qla_tgt_sess *sess;
	uint32_t tag = abts->exchange_addr_to_abort;
	uint8_t s_id[3];
	int rc;
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	unsigned long flags;
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	if (le32_to_cpu(abts->fcp_hdr_le.parameter) & ABTS_PARAM_ABORT_SEQ) {
		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf053,
		    "qla_target(%d): ABTS: Abort Sequence not "
		    "supported\n", vha->vp_idx);
		qlt_24xx_send_abts_resp(vha, abts, FCP_TMF_REJECTED, false);
		return;
	}

	if (tag == ATIO_EXCHANGE_ADDRESS_UNKNOWN) {
		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf010,
		    "qla_target(%d): ABTS: Unknown Exchange "
		    "Address received\n", vha->vp_idx);
		qlt_24xx_send_abts_resp(vha, abts, FCP_TMF_REJECTED, false);
		return;
	}

	ql_dbg(ql_dbg_tgt_mgt, vha, 0xf011,
	    "qla_target(%d): task abort (s_id=%x:%x:%x, "
	    "tag=%d, param=%x)\n", vha->vp_idx, abts->fcp_hdr_le.s_id[2],
	    abts->fcp_hdr_le.s_id[1], abts->fcp_hdr_le.s_id[0], tag,
	    le32_to_cpu(abts->fcp_hdr_le.parameter));

	s_id[0] = abts->fcp_hdr_le.s_id[2];
	s_id[1] = abts->fcp_hdr_le.s_id[1];
	s_id[2] = abts->fcp_hdr_le.s_id[0];

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	spin_lock_irqsave(&ha->tgt.sess_lock, flags);
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	sess = ha->tgt.tgt_ops->find_sess_by_s_id(vha, s_id);
	if (!sess) {
		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf012,
		    "qla_target(%d): task abort for non-existant session\n",
		    vha->vp_idx);
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		rc = qlt_sched_sess_work(vha->vha_tgt.qla_tgt,
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		    QLA_TGT_SESS_WORK_ABORT, abts, sizeof(*abts));
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		spin_unlock_irqrestore(&ha->tgt.sess_lock, flags);

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		if (rc != 0) {
			qlt_24xx_send_abts_resp(vha, abts, FCP_TMF_REJECTED,
			    false);
		}
		return;
	}
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	spin_unlock_irqrestore(&ha->tgt.sess_lock, flags);

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	if (sess->deleted == QLA_SESS_DELETION_IN_PROGRESS) {
		qlt_24xx_send_abts_resp(vha, abts, FCP_TMF_REJECTED, false);
		return;
	}

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	rc = __qlt_24xx_handle_abts(vha, abts, sess);
	if (rc != 0) {
		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf054,
		    "qla_target(%d): __qlt_24xx_handle_abts() failed: %d\n",
		    vha->vp_idx, rc);
		qlt_24xx_send_abts_resp(vha, abts, FCP_TMF_REJECTED, false);
		return;
	}
}

/*
 * ha->hardware_lock supposed to be held on entry. Might drop it, then reaquire
 */
static void qlt_24xx_send_task_mgmt_ctio(struct scsi_qla_host *ha,
	struct qla_tgt_mgmt_cmd *mcmd, uint32_t resp_code)
{
	struct atio_from_isp *atio = &mcmd->orig_iocb.atio;
	struct ctio7_to_24xx *ctio;