--- /dev/null
+/*******************************************************************************
+ * Filename: target_core_transport.c
+ *
+ * This file contains the Generic Target Engine Core.
+ *
+ * (c) Copyright 2002-2013 Datera, Inc.
+ *
+ * Nicholas A. Bellinger <nab@kernel.org>
+ *
+ * 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; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ ******************************************************************************/
+
+#include <linux/net.h>
+#include <linux/delay.h>
+#include <linux/string.h>
+#include <linux/timer.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/kthread.h>
+#include <linux/in.h>
+#include <linux/cdrom.h>
+#include <linux/module.h>
+#include <linux/ratelimit.h>
+#include <asm/unaligned.h>
+#include <net/sock.h>
+#include <net/tcp.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_tcq.h>
+
+#include <target/target_core_base.h>
+#include <target/target_core_backend.h>
+#include <target/target_core_fabric.h>
+#include <target/target_core_configfs.h>
+
+#include "target_core_internal.h"
+#include "target_core_alua.h"
+#include "target_core_pr.h"
+#include "target_core_ua.h"
+
+#define CREATE_TRACE_POINTS
+#include <trace/events/target.h>
+
+static struct workqueue_struct *target_completion_wq;
+static struct kmem_cache *se_sess_cache;
+struct kmem_cache *se_ua_cache;
+struct kmem_cache *t10_pr_reg_cache;
+struct kmem_cache *t10_alua_lu_gp_cache;
+struct kmem_cache *t10_alua_lu_gp_mem_cache;
+struct kmem_cache *t10_alua_tg_pt_gp_cache;
+struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
+struct kmem_cache *t10_alua_lba_map_cache;
+struct kmem_cache *t10_alua_lba_map_mem_cache;
+
+static void transport_complete_task_attr(struct se_cmd *cmd);
+static void transport_handle_queue_full(struct se_cmd *cmd,
+ struct se_device *dev);
+static int transport_put_cmd(struct se_cmd *cmd);
+static void target_complete_ok_work(struct work_struct *work);
+
+int init_se_kmem_caches(void)
+{
+ se_sess_cache = kmem_cache_create("se_sess_cache",
+ sizeof(struct se_session), __alignof__(struct se_session),
+ 0, NULL);
+ if (!se_sess_cache) {
+ pr_err("kmem_cache_create() for struct se_session"
+ " failed\n");
+ goto out;
+ }
+ se_ua_cache = kmem_cache_create("se_ua_cache",
+ sizeof(struct se_ua), __alignof__(struct se_ua),
+ 0, NULL);
+ if (!se_ua_cache) {
+ pr_err("kmem_cache_create() for struct se_ua failed\n");
+ goto out_free_sess_cache;
+ }
+ t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
+ sizeof(struct t10_pr_registration),
+ __alignof__(struct t10_pr_registration), 0, NULL);
+ if (!t10_pr_reg_cache) {
+ pr_err("kmem_cache_create() for struct t10_pr_registration"
+ " failed\n");
+ goto out_free_ua_cache;
+ }
+ t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
+ sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
+ 0, NULL);
+ if (!t10_alua_lu_gp_cache) {
+ pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
+ " failed\n");
+ goto out_free_pr_reg_cache;
+ }
+ t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
+ sizeof(struct t10_alua_lu_gp_member),
+ __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
+ if (!t10_alua_lu_gp_mem_cache) {
+ pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
+ "cache failed\n");
+ goto out_free_lu_gp_cache;
+ }
+ t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
+ sizeof(struct t10_alua_tg_pt_gp),
+ __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
+ if (!t10_alua_tg_pt_gp_cache) {
+ pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
+ "cache failed\n");
+ goto out_free_lu_gp_mem_cache;
+ }
+ t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
+ "t10_alua_tg_pt_gp_mem_cache",
+ sizeof(struct t10_alua_tg_pt_gp_member),
+ __alignof__(struct t10_alua_tg_pt_gp_member),
+ 0, NULL);
+ if (!t10_alua_tg_pt_gp_mem_cache) {
+ pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
+ "mem_t failed\n");
+ goto out_free_tg_pt_gp_cache;
+ }
+ t10_alua_lba_map_cache = kmem_cache_create(
+ "t10_alua_lba_map_cache",
+ sizeof(struct t10_alua_lba_map),
+ __alignof__(struct t10_alua_lba_map), 0, NULL);
+ if (!t10_alua_lba_map_cache) {
+ pr_err("kmem_cache_create() for t10_alua_lba_map_"
+ "cache failed\n");
+ goto out_free_tg_pt_gp_mem_cache;
+ }
+ t10_alua_lba_map_mem_cache = kmem_cache_create(
+ "t10_alua_lba_map_mem_cache",
+ sizeof(struct t10_alua_lba_map_member),
+ __alignof__(struct t10_alua_lba_map_member), 0, NULL);
+ if (!t10_alua_lba_map_mem_cache) {
+ pr_err("kmem_cache_create() for t10_alua_lba_map_mem_"
+ "cache failed\n");
+ goto out_free_lba_map_cache;
+ }
+
+ target_completion_wq = alloc_workqueue("target_completion",
+ WQ_MEM_RECLAIM, 0);
+ if (!target_completion_wq)
+ goto out_free_lba_map_mem_cache;
+
+ return 0;
+
+out_free_lba_map_mem_cache:
+ kmem_cache_destroy(t10_alua_lba_map_mem_cache);
+out_free_lba_map_cache:
+ kmem_cache_destroy(t10_alua_lba_map_cache);
+out_free_tg_pt_gp_mem_cache:
+ kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
+out_free_tg_pt_gp_cache:
+ kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
+out_free_lu_gp_mem_cache:
+ kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
+out_free_lu_gp_cache:
+ kmem_cache_destroy(t10_alua_lu_gp_cache);
+out_free_pr_reg_cache:
+ kmem_cache_destroy(t10_pr_reg_cache);
+out_free_ua_cache:
+ kmem_cache_destroy(se_ua_cache);
+out_free_sess_cache:
+ kmem_cache_destroy(se_sess_cache);
+out:
+ return -ENOMEM;
+}
+
+void release_se_kmem_caches(void)
+{
+ destroy_workqueue(target_completion_wq);
+ kmem_cache_destroy(se_sess_cache);
+ kmem_cache_destroy(se_ua_cache);
+ kmem_cache_destroy(t10_pr_reg_cache);
+ kmem_cache_destroy(t10_alua_lu_gp_cache);
+ kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
+ kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
+ kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
+ kmem_cache_destroy(t10_alua_lba_map_cache);
+ kmem_cache_destroy(t10_alua_lba_map_mem_cache);
+}
+
+/* This code ensures unique mib indexes are handed out. */
+static DEFINE_SPINLOCK(scsi_mib_index_lock);
+static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
+
+/*
+ * Allocate a new row index for the entry type specified
+ */
+u32 scsi_get_new_index(scsi_index_t type)
+{
+ u32 new_index;
+
+ BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
+
+ spin_lock(&scsi_mib_index_lock);
+ new_index = ++scsi_mib_index[type];
+ spin_unlock(&scsi_mib_index_lock);
+
+ return new_index;
+}
+
+void transport_subsystem_check_init(void)
+{
+ int ret;
+ static int sub_api_initialized;
+
+ if (sub_api_initialized)
+ return;
+
+ ret = request_module("target_core_iblock");
+ if (ret != 0)
+ pr_err("Unable to load target_core_iblock\n");
+
+ ret = request_module("target_core_file");
+ if (ret != 0)
+ pr_err("Unable to load target_core_file\n");
+
+ ret = request_module("target_core_pscsi");
+ if (ret != 0)
+ pr_err("Unable to load target_core_pscsi\n");
+
+ ret = request_module("target_core_user");
+ if (ret != 0)
+ pr_err("Unable to load target_core_user\n");
+
+ sub_api_initialized = 1;
+}
+
+struct se_session *transport_init_session(enum target_prot_op sup_prot_ops)
+{
+ struct se_session *se_sess;
+
+ se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
+ if (!se_sess) {
+ pr_err("Unable to allocate struct se_session from"
+ " se_sess_cache\n");
+ return ERR_PTR(-ENOMEM);
+ }
+ INIT_LIST_HEAD(&se_sess->sess_list);
+ INIT_LIST_HEAD(&se_sess->sess_acl_list);
+ INIT_LIST_HEAD(&se_sess->sess_cmd_list);
+ INIT_LIST_HEAD(&se_sess->sess_wait_list);
+ spin_lock_init(&se_sess->sess_cmd_lock);
+ kref_init(&se_sess->sess_kref);
+ se_sess->sup_prot_ops = sup_prot_ops;
+
+ return se_sess;
+}
+EXPORT_SYMBOL(transport_init_session);
+
+int transport_alloc_session_tags(struct se_session *se_sess,
+ unsigned int tag_num, unsigned int tag_size)
+{
+ int rc;
+
+ se_sess->sess_cmd_map = kzalloc(tag_num * tag_size,
+ GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
+ if (!se_sess->sess_cmd_map) {
+ se_sess->sess_cmd_map = vzalloc(tag_num * tag_size);
+ if (!se_sess->sess_cmd_map) {
+ pr_err("Unable to allocate se_sess->sess_cmd_map\n");
+ return -ENOMEM;
+ }
+ }
+
+ rc = percpu_ida_init(&se_sess->sess_tag_pool, tag_num);
+ if (rc < 0) {
+ pr_err("Unable to init se_sess->sess_tag_pool,"
+ " tag_num: %u\n", tag_num);
+ if (is_vmalloc_addr(se_sess->sess_cmd_map))
+ vfree(se_sess->sess_cmd_map);
+ else
+ kfree(se_sess->sess_cmd_map);
+ se_sess->sess_cmd_map = NULL;
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(transport_alloc_session_tags);
+
+struct se_session *transport_init_session_tags(unsigned int tag_num,
+ unsigned int tag_size,
+ enum target_prot_op sup_prot_ops)
+{
+ struct se_session *se_sess;
+ int rc;
+
+ se_sess = transport_init_session(sup_prot_ops);
+ if (IS_ERR(se_sess))
+ return se_sess;
+
+ rc = transport_alloc_session_tags(se_sess, tag_num, tag_size);
+ if (rc < 0) {
+ transport_free_session(se_sess);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ return se_sess;
+}
+EXPORT_SYMBOL(transport_init_session_tags);
+
+/*
+ * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
+ */
+void __transport_register_session(
+ struct se_portal_group *se_tpg,
+ struct se_node_acl *se_nacl,
+ struct se_session *se_sess,
+ void *fabric_sess_ptr)
+{
+ const struct target_core_fabric_ops *tfo = se_tpg->se_tpg_tfo;
+ unsigned char buf[PR_REG_ISID_LEN];
+
+ se_sess->se_tpg = se_tpg;
+ se_sess->fabric_sess_ptr = fabric_sess_ptr;
+ /*
+ * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
+ *
+ * Only set for struct se_session's that will actually be moving I/O.
+ * eg: *NOT* discovery sessions.
+ */
+ if (se_nacl) {
+ /*
+ *
+ * Determine if fabric allows for T10-PI feature bits exposed to
+ * initiators for device backends with !dev->dev_attrib.pi_prot_type.
+ *
+ * If so, then always save prot_type on a per se_node_acl node
+ * basis and re-instate the previous sess_prot_type to avoid
+ * disabling PI from below any previously initiator side
+ * registered LUNs.
+ */
+ if (se_nacl->saved_prot_type)
+ se_sess->sess_prot_type = se_nacl->saved_prot_type;
+ else if (tfo->tpg_check_prot_fabric_only)
+ se_sess->sess_prot_type = se_nacl->saved_prot_type =
+ tfo->tpg_check_prot_fabric_only(se_tpg);
+ /*
+ * If the fabric module supports an ISID based TransportID,
+ * save this value in binary from the fabric I_T Nexus now.
+ */
+ if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
+ memset(&buf[0], 0, PR_REG_ISID_LEN);
+ se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
+ &buf[0], PR_REG_ISID_LEN);
+ se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
+ }
+ kref_get(&se_nacl->acl_kref);
+
+ spin_lock_irq(&se_nacl->nacl_sess_lock);
+ /*
+ * The se_nacl->nacl_sess pointer will be set to the
+ * last active I_T Nexus for each struct se_node_acl.
+ */
+ se_nacl->nacl_sess = se_sess;
+
+ list_add_tail(&se_sess->sess_acl_list,
+ &se_nacl->acl_sess_list);
+ spin_unlock_irq(&se_nacl->nacl_sess_lock);
+ }
+ list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
+
+ pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
+ se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
+}
+EXPORT_SYMBOL(__transport_register_session);
+
+void transport_register_session(
+ struct se_portal_group *se_tpg,
+ struct se_node_acl *se_nacl,
+ struct se_session *se_sess,
+ void *fabric_sess_ptr)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&se_tpg->session_lock, flags);
+ __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
+ spin_unlock_irqrestore(&se_tpg->session_lock, flags);
+}
+EXPORT_SYMBOL(transport_register_session);
+
+static void target_release_session(struct kref *kref)
+{
+ struct se_session *se_sess = container_of(kref,
+ struct se_session, sess_kref);
+ struct se_portal_group *se_tpg = se_sess->se_tpg;
+
+ se_tpg->se_tpg_tfo->close_session(se_sess);
+}
+
+void target_get_session(struct se_session *se_sess)
+{
+ kref_get(&se_sess->sess_kref);
+}
+EXPORT_SYMBOL(target_get_session);
+
+void target_put_session(struct se_session *se_sess)
+{
+ struct se_portal_group *tpg = se_sess->se_tpg;
+
+ if (tpg->se_tpg_tfo->put_session != NULL) {
+ tpg->se_tpg_tfo->put_session(se_sess);
+ return;
+ }
+ kref_put(&se_sess->sess_kref, target_release_session);
+}
+EXPORT_SYMBOL(target_put_session);
+
+ssize_t target_show_dynamic_sessions(struct se_portal_group *se_tpg, char *page)
+{
+ struct se_session *se_sess;
+ ssize_t len = 0;
+
+ spin_lock_bh(&se_tpg->session_lock);
+ list_for_each_entry(se_sess, &se_tpg->tpg_sess_list, sess_list) {
+ if (!se_sess->se_node_acl)
+ continue;
+ if (!se_sess->se_node_acl->dynamic_node_acl)
+ continue;
+ if (strlen(se_sess->se_node_acl->initiatorname) + 1 + len > PAGE_SIZE)
+ break;
+
+ len += snprintf(page + len, PAGE_SIZE - len, "%s\n",
+ se_sess->se_node_acl->initiatorname);
+ len += 1; /* Include NULL terminator */
+ }
+ spin_unlock_bh(&se_tpg->session_lock);
+
+ return len;
+}
+EXPORT_SYMBOL(target_show_dynamic_sessions);
+
+static void target_complete_nacl(struct kref *kref)
+{
+ struct se_node_acl *nacl = container_of(kref,
+ struct se_node_acl, acl_kref);
+
+ complete(&nacl->acl_free_comp);
+}
+
+void target_put_nacl(struct se_node_acl *nacl)
+{
+ kref_put(&nacl->acl_kref, target_complete_nacl);
+}
+
+void transport_deregister_session_configfs(struct se_session *se_sess)
+{
+ struct se_node_acl *se_nacl;
+ unsigned long flags;
+ /*
+ * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
+ */
+ se_nacl = se_sess->se_node_acl;
+ if (se_nacl) {
+ spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
+ if (se_nacl->acl_stop == 0)
+ list_del(&se_sess->sess_acl_list);
+ /*
+ * If the session list is empty, then clear the pointer.
+ * Otherwise, set the struct se_session pointer from the tail
+ * element of the per struct se_node_acl active session list.
+ */
+ if (list_empty(&se_nacl->acl_sess_list))
+ se_nacl->nacl_sess = NULL;
+ else {
+ se_nacl->nacl_sess = container_of(
+ se_nacl->acl_sess_list.prev,
+ struct se_session, sess_acl_list);
+ }
+ spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
+ }
+}
+EXPORT_SYMBOL(transport_deregister_session_configfs);
+
+void transport_free_session(struct se_session *se_sess)
+{
+ if (se_sess->sess_cmd_map) {
+ percpu_ida_destroy(&se_sess->sess_tag_pool);
+ if (is_vmalloc_addr(se_sess->sess_cmd_map))
+ vfree(se_sess->sess_cmd_map);
+ else
+ kfree(se_sess->sess_cmd_map);
+ }
+ kmem_cache_free(se_sess_cache, se_sess);
+}
+EXPORT_SYMBOL(transport_free_session);
+
+void transport_deregister_session(struct se_session *se_sess)
+{
+ struct se_portal_group *se_tpg = se_sess->se_tpg;
+ const struct target_core_fabric_ops *se_tfo;
+ struct se_node_acl *se_nacl;
+ unsigned long flags;
+ bool comp_nacl = true;
+
+ if (!se_tpg) {
+ transport_free_session(se_sess);
+ return;
+ }
+ se_tfo = se_tpg->se_tpg_tfo;
+
+ spin_lock_irqsave(&se_tpg->session_lock, flags);
+ list_del(&se_sess->sess_list);
+ se_sess->se_tpg = NULL;
+ se_sess->fabric_sess_ptr = NULL;
+ spin_unlock_irqrestore(&se_tpg->session_lock, flags);
+
+ /*
+ * Determine if we need to do extra work for this initiator node's
+ * struct se_node_acl if it had been previously dynamically generated.
+ */
+ se_nacl = se_sess->se_node_acl;
+
+ spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
+ if (se_nacl && se_nacl->dynamic_node_acl) {
+ if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
+ list_del(&se_nacl->acl_list);
+ se_tpg->num_node_acls--;
+ spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
+ core_tpg_wait_for_nacl_pr_ref(se_nacl);
+ core_free_device_list_for_node(se_nacl, se_tpg);
+ se_tfo->tpg_release_fabric_acl(se_tpg, se_nacl);
+
+ comp_nacl = false;
+ spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
+ }
+ }
+ spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
+
+ pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
+ se_tpg->se_tpg_tfo->get_fabric_name());
+ /*
+ * If last kref is dropping now for an explicit NodeACL, awake sleeping
+ * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
+ * removal context.
+ */
+ if (se_nacl && comp_nacl)
+ target_put_nacl(se_nacl);
+
+ transport_free_session(se_sess);
+}
+EXPORT_SYMBOL(transport_deregister_session);
+
+/*
+ * Called with cmd->t_state_lock held.
+ */
+static void target_remove_from_state_list(struct se_cmd *cmd)
+{
+ struct se_device *dev = cmd->se_dev;
+ unsigned long flags;
+
+ if (!dev)
+ return;
+
+ if (cmd->transport_state & CMD_T_BUSY)
+ return;
+
+ spin_lock_irqsave(&dev->execute_task_lock, flags);
+ if (cmd->state_active) {
+ list_del(&cmd->state_list);
+ cmd->state_active = false;
+ }
+ spin_unlock_irqrestore(&dev->execute_task_lock, flags);
+}
+
+static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists,
+ bool write_pending)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&cmd->t_state_lock, flags);
+ if (write_pending)
+ cmd->t_state = TRANSPORT_WRITE_PENDING;
+
+ if (remove_from_lists) {
+ target_remove_from_state_list(cmd);
+
+ /*
+ * Clear struct se_cmd->se_lun before the handoff to FE.
+ */
+ cmd->se_lun = NULL;
+ }
+
+ /*
+ * Determine if frontend context caller is requesting the stopping of
+ * this command for frontend exceptions.
+ */
+ if (cmd->transport_state & CMD_T_STOP) {
+ pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
+ __func__, __LINE__,
+ cmd->se_tfo->get_task_tag(cmd));
+
+ spin_unlock_irqrestore(&cmd->t_state_lock, flags);
+
+ complete_all(&cmd->t_transport_stop_comp);
+ return 1;
+ }
+
+ cmd->transport_state &= ~CMD_T_ACTIVE;
+ if (remove_from_lists) {
+ /*
+ * Some fabric modules like tcm_loop can release
+ * their internally allocated I/O reference now and
+ * struct se_cmd now.
+ *
+ * Fabric modules are expected to return '1' here if the
+ * se_cmd being passed is released at this point,
+ * or zero if not being released.
+ */
+ if (cmd->se_tfo->check_stop_free != NULL) {
+ spin_unlock_irqrestore(&cmd->t_state_lock, flags);
+ return cmd->se_tfo->check_stop_free(cmd);
+ }
+ }
+
+ spin_unlock_irqrestore(&cmd->t_state_lock, flags);
+ return 0;
+}
+
+static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
+{
+ return transport_cmd_check_stop(cmd, true, false);
+}
+
+static void transport_lun_remove_cmd(struct se_cmd *cmd)
+{
+ struct se_lun *lun = cmd->se_lun;
+
+ if (!lun)
+ return;
+
+ if (cmpxchg(&cmd->lun_ref_active, true, false))
+ percpu_ref_put(&lun->lun_ref);
+}
+
+void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
+{
+ if (cmd->se_cmd_flags & SCF_SE_LUN_CMD)
+ transport_lun_remove_cmd(cmd);
+ /*
+ * Allow the fabric driver to unmap any resources before
+ * releasing the descriptor via TFO->release_cmd()
+ */
+ if (remove)
+ cmd->se_tfo->aborted_task(cmd);
+
+ if (transport_cmd_check_stop_to_fabric(cmd))
+ return;
+ if (remove)
+ transport_put_cmd(cmd);
+}
+
+static void target_complete_failure_work(struct work_struct *work)
+{
+ struct se_cmd *cmd = container_of(work, struct se_cmd, work);
+
+ transport_generic_request_failure(cmd,
+ TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE);
+}
+
+/*
+ * Used when asking transport to copy Sense Data from the underlying
+ * Linux/SCSI struct scsi_cmnd
+ */
+static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd)
+{
+ struct se_device *dev = cmd->se_dev;
+
+ WARN_ON(!cmd->se_lun);
+
+ if (!dev)
+ return NULL;
+
+ if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION)
+ return NULL;
+
+ cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
+
+ pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
+ dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
+ return cmd->sense_buffer;
+}
+
+void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
+{
+ struct se_device *dev = cmd->se_dev;
+ int success = scsi_status == GOOD;
+ unsigned long flags;
+
+ cmd->scsi_status = scsi_status;
+
+
+ spin_lock_irqsave(&cmd->t_state_lock, flags);
+ cmd->transport_state &= ~CMD_T_BUSY;
+
+ if (dev && dev->transport->transport_complete) {
+ dev->transport->transport_complete(cmd,
+ cmd->t_data_sg,
+ transport_get_sense_buffer(cmd));
+ if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
+ success = 1;
+ }
+
+ /*
+ * See if we are waiting to complete for an exception condition.
+ */
+ if (cmd->transport_state & CMD_T_REQUEST_STOP) {
+ spin_unlock_irqrestore(&cmd->t_state_lock, flags);
+ complete(&cmd->task_stop_comp);
+ return;
+ }
+
+ /*
+ * Check for case where an explicit ABORT_TASK has been received
+ * and transport_wait_for_tasks() will be waiting for completion..
+ */
+ if (cmd->transport_state & CMD_T_ABORTED &&
+ cmd->transport_state & CMD_T_STOP) {
+ spin_unlock_irqrestore(&cmd->t_state_lock, flags);
+ complete_all(&cmd->t_transport_stop_comp);
+ return;
+ } else if (!success) {
+ INIT_WORK(&cmd->work, target_complete_failure_work);
+ } else {
+ INIT_WORK(&cmd->work, target_complete_ok_work);
+ }
+
+ cmd->t_state = TRANSPORT_COMPLETE;
+ cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
+ spin_unlock_irqrestore(&cmd->t_state_lock, flags);
+
+ queue_work(target_completion_wq, &cmd->work);
+}
+EXPORT_SYMBOL(target_complete_cmd);
+
+void target_complete_cmd_with_length(struct se_cmd *cmd, u8 scsi_status, int length)
+{
+ if (scsi_status == SAM_STAT_GOOD && length < cmd->data_length) {
+ if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
+ cmd->residual_count += cmd->data_length - length;
+ } else {
+ cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
+ cmd->residual_count = cmd->data_length - length;
+ }
+
+ cmd->data_length = length;
+ }
+
+ target_complete_cmd(cmd, scsi_status);
+}
+EXPORT_SYMBOL(target_complete_cmd_with_length);
+
+static void target_add_to_state_list(struct se_cmd *cmd)
+{
+ struct se_device *dev = cmd->se_dev;
+ unsigned long flags;
+
+ spin_lock_irqsave(&dev->execute_task_lock, flags);
+ if (!cmd->state_active) {
+ list_add_tail(&cmd->state_list, &dev->state_list);
+ cmd->state_active = true;
+ }
+ spin_unlock_irqrestore(&dev->execute_task_lock, flags);
+}
+
+/*
+ * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
+ */
+static void transport_write_pending_qf(struct se_cmd *cmd);
+static void transport_complete_qf(struct se_cmd *cmd);
+
+void target_qf_do_work(struct work_struct *work)
+{
+ struct se_device *dev = container_of(work, struct se_device,
+ qf_work_queue);
+ LIST_HEAD(qf_cmd_list);
+ struct se_cmd *cmd, *cmd_tmp;
+
+ spin_lock_irq(&dev->qf_cmd_lock);
+ list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
+ spin_unlock_irq(&dev->qf_cmd_lock);
+
+ list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
+ list_del(&cmd->se_qf_node);
+ atomic_dec_mb(&dev->dev_qf_count);
+
+ pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
+ " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
+ (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
+ (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
+ : "UNKNOWN");
+
+ if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
+ transport_write_pending_qf(cmd);
+ else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK)
+ transport_complete_qf(cmd);
+ }
+}
+
+unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
+{
+ switch (cmd->data_direction) {
+ case DMA_NONE:
+ return "NONE";
+ case DMA_FROM_DEVICE:
+ return "READ";
+ case DMA_TO_DEVICE:
+ return "WRITE";
+ case DMA_BIDIRECTIONAL:
+ return "BIDI";
+ default:
+ break;
+ }
+
+ return "UNKNOWN";
+}
+
+void transport_dump_dev_state(
+ struct se_device *dev,
+ char *b,
+ int *bl)
+{
+ *bl += sprintf(b + *bl, "Status: ");
+ if (dev->export_count)
+ *bl += sprintf(b + *bl, "ACTIVATED");
+ else
+ *bl += sprintf(b + *bl, "DEACTIVATED");
+
+ *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth);
+ *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
+ dev->dev_attrib.block_size,
+ dev->dev_attrib.hw_max_sectors);
+ *bl += sprintf(b + *bl, " ");
+}
+
+void transport_dump_vpd_proto_id(
+ struct t10_vpd *vpd,
+ unsigned char *p_buf,
+ int p_buf_len)
+{
+ unsigned char buf[VPD_TMP_BUF_SIZE];
+ int len;
+
+ memset(buf, 0, VPD_TMP_BUF_SIZE);
+ len = sprintf(buf, "T10 VPD Protocol Identifier: ");
+
+ switch (vpd->protocol_identifier) {
+ case 0x00:
+ sprintf(buf+len, "Fibre Channel\n");
+ break;
+ case 0x10:
+ sprintf(buf+len, "Parallel SCSI\n");
+ break;
+ case 0x20:
+ sprintf(buf+len, "SSA\n");
+ break;
+ case 0x30:
+ sprintf(buf+len, "IEEE 1394\n");
+ break;
+ case 0x40:
+ sprintf(buf+len, "SCSI Remote Direct Memory Access"
+ " Protocol\n");
+ break;
+ case 0x50:
+ sprintf(buf+len, "Internet SCSI (iSCSI)\n");
+ break;
+ case 0x60:
+ sprintf(buf+len, "SAS Serial SCSI Protocol\n");
+ break;
+ case 0x70:
+ sprintf(buf+len, "Automation/Drive Interface Transport"
+ " Protocol\n");
+ break;
+ case 0x80:
+ sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
+ break;
+ default:
+ sprintf(buf+len, "Unknown 0x%02x\n",
+ vpd->protocol_identifier);
+ break;
+ }
+
+ if (p_buf)
+ strncpy(p_buf, buf, p_buf_len);
+ else
+ pr_debug("%s", buf);
+}
+
+void
+transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
+{
+ /*
+ * Check if the Protocol Identifier Valid (PIV) bit is set..
+ *
+ * from spc3r23.pdf section 7.5.1
+ */
+ if (page_83[1] & 0x80) {
+ vpd->protocol_identifier = (page_83[0] & 0xf0);
+ vpd->protocol_identifier_set = 1;
+ transport_dump_vpd_proto_id(vpd, NULL, 0);
+ }
+}
+EXPORT_SYMBOL(transport_set_vpd_proto_id);
+
+int transport_dump_vpd_assoc(
+ struct t10_vpd *vpd,
+ unsigned char *p_buf,
+ int p_buf_len)
+{
+ unsigned char buf[VPD_TMP_BUF_SIZE];
+ int ret = 0;
+ int len;
+
+ memset(buf, 0, VPD_TMP_BUF_SIZE);
+ len = sprintf(buf, "T10 VPD Identifier Association: ");
+
+ switch (vpd->association) {
+ case 0x00:
+ sprintf(buf+len, "addressed logical unit\n");
+ break;
+ case 0x10:
+ sprintf(buf+len, "target port\n");
+ break;
+ case 0x20:
+ sprintf(buf+len, "SCSI target device\n");
+ break;
+ default:
+ sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
+ ret = -EINVAL;
+ break;
+ }
+
+ if (p_buf)
+ strncpy(p_buf, buf, p_buf_len);
+ else
+ pr_debug("%s", buf);
+
+ return ret;
+}
+
+int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
+{
+ /*
+ * The VPD identification association..
+ *
+ * from spc3r23.pdf Section 7.6.3.1 Table 297
+ */
+ vpd->association = (page_83[1] & 0x30);
+ return transport_dump_vpd_assoc(vpd, NULL, 0);
+}
+EXPORT_SYMBOL(transport_set_vpd_assoc);
+
+int transport_dump_vpd_ident_type(
+ struct t10_vpd *vpd,
+ unsigned char *p_buf,
+ int p_buf_len)
+{
+ unsigned char buf[VPD_TMP_BUF_SIZE];
+ int ret = 0;
+ int len;
+
+ memset(buf, 0, VPD_TMP_BUF_SIZE);
+ len = sprintf(buf, "T10 VPD Identifier Type: ");
+
+ switch (vpd->device_identifier_type) {
+ case 0x00:
+ sprintf(buf+len, "Vendor specific\n");
+ break;
+ case 0x01:
+ sprintf(buf+len, "T10 Vendor ID based\n");
+ break;
+ case 0x02:
+ sprintf(buf+len, "EUI-64 based\n");
+ break;
+ case 0x03:
+ sprintf(buf+len, "NAA\n");
+ break;
+ case 0x04:
+ sprintf(buf+len, "Relative target port identifier\n");
+ break;
+ case 0x08:
+ sprintf(buf+len, "SCSI name string\n");
+ break;
+ default:
+ sprintf(buf+len, "Unsupported: 0x%02x\n",
+ vpd->device_identifier_type);
+ ret = -EINVAL;
+ break;
+ }
+
+ if (p_buf) {
+ if (p_buf_len < strlen(buf)+1)
+ return -EINVAL;
+ strncpy(p_buf, buf, p_buf_len);
+ } else {
+ pr_debug("%s", buf);
+ }
+
+ return ret;
+}
+
+int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
+{
+ /*
+ * The VPD identifier type..
+ *
+ * from spc3r23.pdf Section 7.6.3.1 Table 298
+ */
+ vpd->device_identifier_type = (page_83[1] & 0x0f);
+ return transport_dump_vpd_ident_type(vpd, NULL, 0);
+}
+EXPORT_SYMBOL(transport_set_vpd_ident_type);
+
+int transport_dump_vpd_ident(
+ struct t10_vpd *vpd,
+ unsigned char *p_buf,
+ int p_buf_len)
+{
+ unsigned char buf[VPD_TMP_BUF_SIZE];
+ int ret = 0;
+
+ memset(buf, 0, VPD_TMP_BUF_SIZE);
+
+ switch (vpd->device_identifier_code_set) {
+ case 0x01: /* Binary */
+ snprintf(buf, sizeof(buf),
+ "T10 VPD Binary Device Identifier: %s\n",
+ &vpd->device_identifier[0]);
+ break;
+ case 0x02: /* ASCII */
+ snprintf(buf, sizeof(buf),
+ "T10 VPD ASCII Device Identifier: %s\n",
+ &vpd->device_identifier[0]);
+ break;
+ case 0x03: /* UTF-8 */
+ snprintf(buf, sizeof(buf),
+ "T10 VPD UTF-8 Device Identifier: %s\n",
+ &vpd->device_identifier[0]);
+ break;
+ default:
+ sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
+ " 0x%02x", vpd->device_identifier_code_set);
+ ret = -EINVAL;
+ break;
+ }
+
+ if (p_buf)
+ strncpy(p_buf, buf, p_buf_len);
+ else
+ pr_debug("%s", buf);
+
+ return ret;
+}
+
+int
+transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
+{
+ static const char hex_str[] = "0123456789abcdef";
+ int j = 0, i = 4; /* offset to start of the identifier */
+
+ /*
+ * The VPD Code Set (encoding)
+ *
+ * from spc3r23.pdf Section 7.6.3.1 Table 296
+ */
+ vpd->device_identifier_code_set = (page_83[0] & 0x0f);
+ switch (vpd->device_identifier_code_set) {
+ case 0x01: /* Binary */
+ vpd->device_identifier[j++] =
+ hex_str[vpd->device_identifier_type];
+ while (i < (4 + page_83[3])) {
+ vpd->device_identifier[j++] =
+ hex_str[(page_83[i] & 0xf0) >> 4];
+ vpd->device_identifier[j++] =
+ hex_str[page_83[i] & 0x0f];
+ i++;
+ }
+ break;
+ case 0x02: /* ASCII */
+ case 0x03: /* UTF-8 */
+ while (i < (4 + page_83[3]))
+ vpd->device_identifier[j++] = page_83[i++];
+ break;
+ default:
+ break;
+ }
+
+ return transport_dump_vpd_ident(vpd, NULL, 0);
+}
+EXPORT_SYMBOL(transport_set_vpd_ident);
+
+sense_reason_t
+target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
+{
+ struct se_device *dev = cmd->se_dev;
+
+ if (cmd->unknown_data_length) {
+ cmd->data_length = size;
+ } else if (size != cmd->data_length) {
+ pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
+ " %u does not match SCSI CDB Length: %u for SAM Opcode:"
+ " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
+ cmd->data_length, size, cmd->t_task_cdb[0]);
+
+ if (cmd->data_direction == DMA_TO_DEVICE) {
+ pr_err("Rejecting underflow/overflow"
+ " WRITE data\n");
+ return TCM_INVALID_CDB_FIELD;
+ }
+ /*
+ * Reject READ_* or WRITE_* with overflow/underflow for
+ * type SCF_SCSI_DATA_CDB.
+ */
+ if (dev->dev_attrib.block_size != 512) {
+ pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
+ " CDB on non 512-byte sector setup subsystem"
+ " plugin: %s\n", dev->transport->name);
+ /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
+ return TCM_INVALID_CDB_FIELD;
+ }
+ /*
+ * For the overflow case keep the existing fabric provided
+ * ->data_length. Otherwise for the underflow case, reset
+ * ->data_length to the smaller SCSI expected data transfer
+ * length.
+ */
+ if (size > cmd->data_length) {
+ cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
+ cmd->residual_count = (size - cmd->data_length);
+ } else {
+ cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
+ cmd->residual_count = (cmd->data_length - size);
+ cmd->data_length = size;
+ }
+ }
+
+ return 0;
+
+}
+
+/*
+ * Used by fabric modules containing a local struct se_cmd within their
+ * fabric dependent per I/O descriptor.
+ */
+void transport_init_se_cmd(
+ struct se_cmd *cmd,
+ const struct target_core_fabric_ops *tfo,
+ struct se_session *se_sess,
+ u32 data_length,
+ int data_direction,
+ int task_attr,
+ unsigned char *sense_buffer)
+{
+ INIT_LIST_HEAD(&cmd->se_delayed_node);
+ INIT_LIST_HEAD(&cmd->se_qf_node);
+ INIT_LIST_HEAD(&cmd->se_cmd_list);
+ INIT_LIST_HEAD(&cmd->state_list);
+ init_completion(&cmd->t_transport_stop_comp);
+ init_completion(&cmd->cmd_wait_comp);
+ init_completion(&cmd->task_stop_comp);
+ spin_lock_init(&cmd->t_state_lock);
+ kref_init(&cmd->cmd_kref);
+ cmd->transport_state = CMD_T_DEV_ACTIVE;
+
+ cmd->se_tfo = tfo;
+ cmd->se_sess = se_sess;
+ cmd->data_length = data_length;
+ cmd->data_direction = data_direction;
+ cmd->sam_task_attr = task_attr;
+ cmd->sense_buffer = sense_buffer;
+
+ cmd->state_active = false;
+}
+EXPORT_SYMBOL(transport_init_se_cmd);
+
+static sense_reason_t
+transport_check_alloc_task_attr(struct se_cmd *cmd)
+{
+ struct se_device *dev = cmd->se_dev;
+
+ /*
+ * Check if SAM Task Attribute emulation is enabled for this
+ * struct se_device storage object
+ */
+ if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
+ return 0;
+
+ if (cmd->sam_task_attr == TCM_ACA_TAG) {
+ pr_debug("SAM Task Attribute ACA"
+ " emulation is not supported\n");
+ return TCM_INVALID_CDB_FIELD;
+ }
+ /*
+ * Used to determine when ORDERED commands should go from
+ * Dormant to Active status.
+ */
+ cmd->se_ordered_id = atomic_inc_return(&dev->dev_ordered_id);
+ pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
+ cmd->se_ordered_id, cmd->sam_task_attr,
+ dev->transport->name);
+ return 0;
+}
+
+sense_reason_t
+target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb)
+{
+ struct se_device *dev = cmd->se_dev;
+ sense_reason_t ret;
+
+ /*
+ * Ensure that the received CDB is less than the max (252 + 8) bytes
+ * for VARIABLE_LENGTH_CMD
+ */
+ if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
+ pr_err("Received SCSI CDB with command_size: %d that"
+ " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
+ scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
+ return TCM_INVALID_CDB_FIELD;
+ }
+ /*
+ * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
+ * allocate the additional extended CDB buffer now.. Otherwise
+ * setup the pointer from __t_task_cdb to t_task_cdb.
+ */
+ if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
+ cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
+ GFP_KERNEL);
+ if (!cmd->t_task_cdb) {
+ pr_err("Unable to allocate cmd->t_task_cdb"
+ " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
+ scsi_command_size(cdb),
+ (unsigned long)sizeof(cmd->__t_task_cdb));
+ return TCM_OUT_OF_RESOURCES;
+ }
+ } else
+ cmd->t_task_cdb = &cmd->__t_task_cdb[0];
+ /*
+ * Copy the original CDB into cmd->
+ */
+ memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
+
+ trace_target_sequencer_start(cmd);
+
+ /*
+ * Check for an existing UNIT ATTENTION condition
+ */
+ ret = target_scsi3_ua_check(cmd);
+ if (ret)
+ return ret;
+
+ ret = target_alua_state_check(cmd);
+ if (ret)
+ return ret;
+
+ ret = target_check_reservation(cmd);
+ if (ret) {
+ cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
+ return ret;
+ }
+
+ ret = dev->transport->parse_cdb(cmd);
+ if (ret)
+ return ret;
+
+ ret = transport_check_alloc_task_attr(cmd);
+ if (ret)
+ return ret;
+
+ cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
+
+ spin_lock(&cmd->se_lun->lun_sep_lock);
+ if (cmd->se_lun->lun_sep)
+ cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
+ spin_unlock(&cmd->se_lun->lun_sep_lock);
+ return 0;
+}
+EXPORT_SYMBOL(target_setup_cmd_from_cdb);
+
+/*
+ * Used by fabric module frontends to queue tasks directly.
+ * Many only be used from process context only
+ */
+int transport_handle_cdb_direct(
+ struct se_cmd *cmd)
+{
+ sense_reason_t ret;
+
+ if (!cmd->se_lun) {
+ dump_stack();
+ pr_err("cmd->se_lun is NULL\n");
+ return -EINVAL;
+ }
+ if (in_interrupt()) {
+ dump_stack();
+ pr_err("transport_generic_handle_cdb cannot be called"
+ " from interrupt context\n");
+ return -EINVAL;
+ }
+ /*
+ * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
+ * outstanding descriptors are handled correctly during shutdown via
+ * transport_wait_for_tasks()
+ *
+ * Also, we don't take cmd->t_state_lock here as we only expect
+ * this to be called for initial descriptor submission.
+ */
+ cmd->t_state = TRANSPORT_NEW_CMD;
+ cmd->transport_state |= CMD_T_ACTIVE;
+
+ /*
+ * transport_generic_new_cmd() is already handling QUEUE_FULL,
+ * so follow TRANSPORT_NEW_CMD processing thread context usage
+ * and call transport_generic_request_failure() if necessary..
+ */
+ ret = transport_generic_new_cmd(cmd);
+ if (ret)
+ transport_generic_request_failure(cmd, ret);
+ return 0;
+}
+EXPORT_SYMBOL(transport_handle_cdb_direct);
+
+sense_reason_t
+transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl,
+ u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
+{
+ if (!sgl || !sgl_count)
+ return 0;
+
+ /*
+ * Reject SCSI data overflow with map_mem_to_cmd() as incoming
+ * scatterlists already have been set to follow what the fabric
+ * passes for the original expected data transfer length.
+ */
+ if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
+ pr_warn("Rejecting SCSI DATA overflow for fabric using"
+ " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
+ return TCM_INVALID_CDB_FIELD;
+ }
+
+ cmd->t_data_sg = sgl;
+ cmd->t_data_nents = sgl_count;
+
+ if (sgl_bidi && sgl_bidi_count) {
+ cmd->t_bidi_data_sg = sgl_bidi;
+ cmd->t_bidi_data_nents = sgl_bidi_count;
+ }
+ cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
+ return 0;
+}
+
+/*
+ * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
+ * se_cmd + use pre-allocated SGL memory.
+ *
+ * @se_cmd: command descriptor to submit
+ * @se_sess: associated se_sess for endpoint
+ * @cdb: pointer to SCSI CDB
+ * @sense: pointer to SCSI sense buffer
+ * @unpacked_lun: unpacked LUN to reference for struct se_lun
+ * @data_length: fabric expected data transfer length
+ * @task_addr: SAM task attribute
+ * @data_dir: DMA data direction
+ * @flags: flags for command submission from target_sc_flags_tables
+ * @sgl: struct scatterlist memory for unidirectional mapping
+ * @sgl_count: scatterlist count for unidirectional mapping
+ * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
+ * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
+ * @sgl_prot: struct scatterlist memory protection information
+ * @sgl_prot_count: scatterlist count for protection information
+ *
+ * Returns non zero to signal active I/O shutdown failure. All other
+ * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
+ * but still return zero here.
+ *
+ * This may only be called from process context, and also currently
+ * assumes internal allocation of fabric payload buffer by target-core.
+ */
+int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess,
+ unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
+ u32 data_length, int task_attr, int data_dir, int flags,
+ struct scatterlist *sgl, u32 sgl_count,
+ struct scatterlist *sgl_bidi, u32 sgl_bidi_count,
+ struct scatterlist *sgl_prot, u32 sgl_prot_count)
+{
+ struct se_portal_group *se_tpg;
+ sense_reason_t rc;
+ int ret;
+
+ se_tpg = se_sess->se_tpg;
+ BUG_ON(!se_tpg);
+ BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
+ BUG_ON(in_interrupt());
+ /*
+ * Initialize se_cmd for target operation. From this point
+ * exceptions are handled by sending exception status via
+ * target_core_fabric_ops->queue_status() callback
+ */
+ transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
+ data_length, data_dir, task_attr, sense);
+ if (flags & TARGET_SCF_UNKNOWN_SIZE)
+ se_cmd->unknown_data_length = 1;
+ /*
+ * Obtain struct se_cmd->cmd_kref reference and add new cmd to
+ * se_sess->sess_cmd_list. A second kref_get here is necessary
+ * for fabrics using TARGET_SCF_ACK_KREF that expect a second
+ * kref_put() to happen during fabric packet acknowledgement.
+ */
+ ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
+ if (ret)
+ return ret;
+ /*
+ * Signal bidirectional data payloads to target-core
+ */
+ if (flags & TARGET_SCF_BIDI_OP)
+ se_cmd->se_cmd_flags |= SCF_BIDI;
+ /*
+ * Locate se_lun pointer and attach it to struct se_cmd
+ */
+ rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun);
+ if (rc) {
+ transport_send_check_condition_and_sense(se_cmd, rc, 0);
+ target_put_sess_cmd(se_sess, se_cmd);
+ return 0;
+ }
+
+ rc = target_setup_cmd_from_cdb(se_cmd, cdb);
+ if (rc != 0) {
+ transport_generic_request_failure(se_cmd, rc);
+ return 0;
+ }
+
+ /*
+ * Save pointers for SGLs containing protection information,
+ * if present.
+ */
+ if (sgl_prot_count) {
+ se_cmd->t_prot_sg = sgl_prot;
+ se_cmd->t_prot_nents = sgl_prot_count;
+ }
+
+ /*
+ * When a non zero sgl_count has been passed perform SGL passthrough
+ * mapping for pre-allocated fabric memory instead of having target
+ * core perform an internal SGL allocation..
+ */
+ if (sgl_count != 0) {
+ BUG_ON(!sgl);
+
+ /*
+ * A work-around for tcm_loop as some userspace code via
+ * scsi-generic do not memset their associated read buffers,
+ * so go ahead and do that here for type non-data CDBs. Also
+ * note that this is currently guaranteed to be a single SGL
+ * for this case by target core in target_setup_cmd_from_cdb()
+ * -> transport_generic_cmd_sequencer().
+ */
+ if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
+ se_cmd->data_direction == DMA_FROM_DEVICE) {
+ unsigned char *buf = NULL;
+
+ if (sgl)
+ buf = kmap(sg_page(sgl)) + sgl->offset;
+
+ if (buf) {
+ memset(buf, 0, sgl->length);
+ kunmap(sg_page(sgl));
+ }
+ }
+
+ rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count,
+ sgl_bidi, sgl_bidi_count);
+ if (rc != 0) {
+ transport_generic_request_failure(se_cmd, rc);
+ return 0;
+ }
+ }
+
+ /*
+ * Check if we need to delay processing because of ALUA
+ * Active/NonOptimized primary access state..
+ */
+ core_alua_check_nonop_delay(se_cmd);
+
+ transport_handle_cdb_direct(se_cmd);
+ return 0;
+}
+EXPORT_SYMBOL(target_submit_cmd_map_sgls);
+
+/*
+ * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
+ *
+ * @se_cmd: command descriptor to submit
+ * @se_sess: associated se_sess for endpoint
+ * @cdb: pointer to SCSI CDB
+ * @sense: pointer to SCSI sense buffer
+ * @unpacked_lun: unpacked LUN to reference for struct se_lun
+ * @data_length: fabric expected data transfer length
+ * @task_addr: SAM task attribute
+ * @data_dir: DMA data direction
+ * @flags: flags for command submission from target_sc_flags_tables
+ *
+ * Returns non zero to signal active I/O shutdown failure. All other
+ * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
+ * but still return zero here.
+ *
+ * This may only be called from process context, and also currently
+ * assumes internal allocation of fabric payload buffer by target-core.
+ *
+ * It also assumes interal target core SGL memory allocation.
+ */
+int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
+ unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
+ u32 data_length, int task_attr, int data_dir, int flags)
+{
+ return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense,
+ unpacked_lun, data_length, task_attr, data_dir,
+ flags, NULL, 0, NULL, 0, NULL, 0);
+}
+EXPORT_SYMBOL(target_submit_cmd);
+
+static void target_complete_tmr_failure(struct work_struct *work)
+{
+ struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
+
+ se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
+ se_cmd->se_tfo->queue_tm_rsp(se_cmd);
+
+ transport_cmd_check_stop_to_fabric(se_cmd);
+}
+
+/**
+ * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
+ * for TMR CDBs
+ *
+ * @se_cmd: command descriptor to submit
+ * @se_sess: associated se_sess for endpoint
+ * @sense: pointer to SCSI sense buffer
+ * @unpacked_lun: unpacked LUN to reference for struct se_lun
+ * @fabric_context: fabric context for TMR req
+ * @tm_type: Type of TM request
+ * @gfp: gfp type for caller
+ * @tag: referenced task tag for TMR_ABORT_TASK
+ * @flags: submit cmd flags
+ *
+ * Callable from all contexts.
+ **/
+
+int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
+ unsigned char *sense, u32 unpacked_lun,
+ void *fabric_tmr_ptr, unsigned char tm_type,
+ gfp_t gfp, unsigned int tag, int flags)
+{
+ struct se_portal_group *se_tpg;
+ int ret;
+
+ se_tpg = se_sess->se_tpg;
+ BUG_ON(!se_tpg);
+
+ transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
+ 0, DMA_NONE, TCM_SIMPLE_TAG, sense);
+ /*
+ * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
+ * allocation failure.
+ */
+ ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
+ if (ret < 0)
+ return -ENOMEM;
+
+ if (tm_type == TMR_ABORT_TASK)
+ se_cmd->se_tmr_req->ref_task_tag = tag;
+
+ /* See target_submit_cmd for commentary */
+ ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
+ if (ret) {
+ core_tmr_release_req(se_cmd->se_tmr_req);
+ return ret;
+ }
+
+ ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
+ if (ret) {
+ /*
+ * For callback during failure handling, push this work off
+ * to process context with TMR_LUN_DOES_NOT_EXIST status.
+ */
+ INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
+ schedule_work(&se_cmd->work);
+ return 0;
+ }
+ transport_generic_handle_tmr(se_cmd);
+ return 0;
+}
+EXPORT_SYMBOL(target_submit_tmr);
+
+/*
+ * If the cmd is active, request it to be stopped and sleep until it
+ * has completed.
+ */
+bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
+ __releases(&cmd->t_state_lock)
+ __acquires(&cmd->t_state_lock)
+{
+ bool was_active = false;
+
+ if (cmd->transport_state & CMD_T_BUSY) {
+ cmd->transport_state |= CMD_T_REQUEST_STOP;
+ spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
+
+ pr_debug("cmd %p waiting to complete\n", cmd);
+ wait_for_completion(&cmd->task_stop_comp);
+ pr_debug("cmd %p stopped successfully\n", cmd);
+
+ spin_lock_irqsave(&cmd->t_state_lock, *flags);
+ cmd->transport_state &= ~CMD_T_REQUEST_STOP;
+ cmd->transport_state &= ~CMD_T_BUSY;
+ was_active = true;
+ }
+
+ return was_active;
+}
+
+/*
+ * Handle SAM-esque emulation for generic transport request failures.
+ */
+void transport_generic_request_failure(struct se_cmd *cmd,
+ sense_reason_t sense_reason)
+{
+ int ret = 0;
+
+ pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
+ " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
+ cmd->t_task_cdb[0]);
+ pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n",
+ cmd->se_tfo->get_cmd_state(cmd),
+ cmd->t_state, sense_reason);
+ pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
+ (cmd->transport_state & CMD_T_ACTIVE) != 0,
+ (cmd->transport_state & CMD_T_STOP) != 0,
+ (cmd->transport_state & CMD_T_SENT) != 0);
+
+ /*
+ * For SAM Task Attribute emulation for failed struct se_cmd
+ */
+ transport_complete_task_attr(cmd);
+ /*
+ * Handle special case for COMPARE_AND_WRITE failure, where the
+ * callback is expected to drop the per device ->caw_sem.
+ */
+ if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
+ cmd->transport_complete_callback)
+ cmd->transport_complete_callback(cmd, false);
+
+ switch (sense_reason) {
+ case TCM_NON_EXISTENT_LUN:
+ case TCM_UNSUPPORTED_SCSI_OPCODE:
+ case TCM_INVALID_CDB_FIELD:
+ case TCM_INVALID_PARAMETER_LIST:
+ case TCM_PARAMETER_LIST_LENGTH_ERROR:
+ case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
+ case TCM_UNKNOWN_MODE_PAGE:
+ case TCM_WRITE_PROTECTED:
+ case TCM_ADDRESS_OUT_OF_RANGE:
+ case TCM_CHECK_CONDITION_ABORT_CMD:
+ case TCM_CHECK_CONDITION_UNIT_ATTENTION:
+ case TCM_CHECK_CONDITION_NOT_READY:
+ case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED:
+ case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED:
+ case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED:
+ break;
+ case TCM_OUT_OF_RESOURCES:
+ sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
+ break;
+ case TCM_RESERVATION_CONFLICT:
+ /*
+ * No SENSE Data payload for this case, set SCSI Status
+ * and queue the response to $FABRIC_MOD.
+ *
+ * Uses linux/include/scsi/scsi.h SAM status codes defs
+ */
+ cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
+ /*
+ * For UA Interlock Code 11b, a RESERVATION CONFLICT will
+ * establish a UNIT ATTENTION with PREVIOUS RESERVATION
+ * CONFLICT STATUS.
+ *
+ * See spc4r17, section 7.4.6 Control Mode Page, Table 349
+ */
+ if (cmd->se_sess &&
+ cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2)
+ core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
+ cmd->orig_fe_lun, 0x2C,
+ ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
+
+ trace_target_cmd_complete(cmd);
+ ret = cmd->se_tfo-> queue_status(cmd);
+ if (ret == -EAGAIN || ret == -ENOMEM)
+ goto queue_full;
+ goto check_stop;
+ default:
+ pr_err("Unknown transport error for CDB 0x%02x: %d\n",
+ cmd->t_task_cdb[0], sense_reason);
+ sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
+ break;
+ }
+
+ ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0);
+ if (ret == -EAGAIN || ret == -ENOMEM)
+ goto queue_full;
+
+check_stop:
+ transport_lun_remove_cmd(cmd);
+ if (!transport_cmd_check_stop_to_fabric(cmd))
+ ;
+ return;
+
+queue_full:
+ cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
+ transport_handle_queue_full(cmd, cmd->se_dev);
+}
+EXPORT_SYMBOL(transport_generic_request_failure);
+
+void __target_execute_cmd(struct se_cmd *cmd)
+{
+ sense_reason_t ret;
+
+ if (cmd->execute_cmd) {
+ ret = cmd->execute_cmd(cmd);
+ if (ret) {
+ spin_lock_irq(&cmd->t_state_lock);
+ cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
+ spin_unlock_irq(&cmd->t_state_lock);
+
+ transport_generic_request_failure(cmd, ret);
+ }
+ }
+}
+
+static int target_write_prot_action(struct se_cmd *cmd)
+{
+ u32 sectors;
+ /*
+ * Perform WRITE_INSERT of PI using software emulation when backend
+ * device has PI enabled, if the transport has not already generated
+ * PI using hardware WRITE_INSERT offload.
+ */
+ switch (cmd->prot_op) {
+ case TARGET_PROT_DOUT_INSERT:
+ if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_INSERT))
+ sbc_dif_generate(cmd);
+ break;
+ case TARGET_PROT_DOUT_STRIP:
+ if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_STRIP)
+ break;
+
+ sectors = cmd->data_length >> ilog2(cmd->se_dev->dev_attrib.block_size);
+ cmd->pi_err = sbc_dif_verify_write(cmd, cmd->t_task_lba,
+ sectors, 0, NULL, 0);
+ if (unlikely(cmd->pi_err)) {
+ spin_lock_irq(&cmd->t_state_lock);
+ cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
+ spin_unlock_irq(&cmd->t_state_lock);
+ transport_generic_request_failure(cmd, cmd->pi_err);
+ return -1;
+ }
+ break;
+ default:
+ break;
+ }
+
+ return 0;
+}
+
+static bool target_handle_task_attr(struct se_cmd *cmd)
+{
+ struct se_device *dev = cmd->se_dev;
+
+ if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
+ return false;
+
+ /*
+ * Check for the existence of HEAD_OF_QUEUE, and if true return 1
+ * to allow the passed struct se_cmd list of tasks to the front of the list.
+ */
+ switch (cmd->sam_task_attr) {
+ case TCM_HEAD_TAG:
+ pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
+ "se_ordered_id: %u\n",
+ cmd->t_task_cdb[0], cmd->se_ordered_id);
+ return false;
+ case TCM_ORDERED_TAG:
+ atomic_inc_mb(&dev->dev_ordered_sync);
+
+ pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
+ " se_ordered_id: %u\n",
+ cmd->t_task_cdb[0], cmd->se_ordered_id);
+
+ /*
+ * Execute an ORDERED command if no other older commands
+ * exist that need to be completed first.
+ */
+ if (!atomic_read(&dev->simple_cmds))
+ return false;
+ break;
+ default:
+ /*
+ * For SIMPLE and UNTAGGED Task Attribute commands
+ */
+ atomic_inc_mb(&dev->simple_cmds);
+ break;
+ }
+
+ if (atomic_read(&dev->dev_ordered_sync) == 0)
+ return false;
+
+ spin_lock(&dev->delayed_cmd_lock);
+ list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
+ spin_unlock(&dev->delayed_cmd_lock);
+
+ pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
+ " delayed CMD list, se_ordered_id: %u\n",
+ cmd->t_task_cdb[0], cmd->sam_task_attr,
+ cmd->se_ordered_id);
+ return true;
+}
+
+void target_execute_cmd(struct se_cmd *cmd)
+{
+ /*
+ * If the received CDB has aleady been aborted stop processing it here.
+ */
+ if (transport_check_aborted_status(cmd, 1))
+ return;
+
+ /*
+ * Determine if frontend context caller is requesting the stopping of
+ * this command for frontend exceptions.
+ */
+ spin_lock_irq(&cmd->t_state_lock);
+ if (cmd->transport_state & CMD_T_STOP) {
+ pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
+ __func__, __LINE__,
+ cmd->se_tfo->get_task_tag(cmd));
+
+ spin_unlock_irq(&cmd->t_state_lock);
+ complete_all(&cmd->t_transport_stop_comp);
+ return;
+ }
+
+ cmd->t_state = TRANSPORT_PROCESSING;
+ cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT;
+ spin_unlock_irq(&cmd->t_state_lock);
+
+ if (target_write_prot_action(cmd))
+ return;
+
+ if (target_handle_task_attr(cmd)) {
+ spin_lock_irq(&cmd->t_state_lock);
+ cmd->transport_state &= ~(CMD_T_BUSY | CMD_T_SENT);
+ spin_unlock_irq(&cmd->t_state_lock);
+ return;
+ }
+
+ __target_execute_cmd(cmd);
+}
+EXPORT_SYMBOL(target_execute_cmd);
+
+/*
+ * Process all commands up to the last received ORDERED task attribute which
+ * requires another blocking boundary
+ */
+static void target_restart_delayed_cmds(struct se_device *dev)
+{
+ for (;;) {
+ struct se_cmd *cmd;
+
+ spin_lock(&dev->delayed_cmd_lock);
+ if (list_empty(&dev->delayed_cmd_list)) {
+ spin_unlock(&dev->delayed_cmd_lock);
+ break;
+ }
+
+ cmd = list_entry(dev->delayed_cmd_list.next,
+ struct se_cmd, se_delayed_node);
+ list_del(&cmd->se_delayed_node);
+ spin_unlock(&dev->delayed_cmd_lock);
+
+ __target_execute_cmd(cmd);
+
+ if (cmd->sam_task_attr == TCM_ORDERED_TAG)
+ break;
+ }
+}
+
+/*
+ * Called from I/O completion to determine which dormant/delayed
+ * and ordered cmds need to have their tasks added to the execution queue.
+ */
+static void transport_complete_task_attr(struct se_cmd *cmd)
+{
+ struct se_device *dev = cmd->se_dev;
+
+ if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
+ return;
+
+ if (cmd->sam_task_attr == TCM_SIMPLE_TAG) {
+ atomic_dec_mb(&dev->simple_cmds);
+ dev->dev_cur_ordered_id++;
+ pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
+ " SIMPLE: %u\n", dev->dev_cur_ordered_id,
+ cmd->se_ordered_id);
+ } else if (cmd->sam_task_attr == TCM_HEAD_TAG) {
+ dev->dev_cur_ordered_id++;
+ pr_debug("Incremented dev_cur_ordered_id: %u for"
+ " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
+ cmd->se_ordered_id);
+ } else if (cmd->sam_task_attr == TCM_ORDERED_TAG) {
+ atomic_dec_mb(&dev->dev_ordered_sync);
+
+ dev->dev_cur_ordered_id++;
+ pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
+ " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
+ }
+
+ target_restart_delayed_cmds(dev);
+}
+
+static void transport_complete_qf(struct se_cmd *cmd)
+{
+ int ret = 0;
+
+ transport_complete_task_attr(cmd);
+
+ if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
+ trace_target_cmd_complete(cmd);
+ ret = cmd->se_tfo->queue_status(cmd);
+ goto out;
+ }
+
+ switch (cmd->data_direction) {
+ case DMA_FROM_DEVICE:
+ trace_target_cmd_complete(cmd);
+ ret = cmd->se_tfo->queue_data_in(cmd);
+ break;
+ case DMA_TO_DEVICE:
+ if (cmd->se_cmd_flags & SCF_BIDI) {
+ ret = cmd->se_tfo->queue_data_in(cmd);
+ break;
+ }
+ /* Fall through for DMA_TO_DEVICE */
+ case DMA_NONE:
+ trace_target_cmd_complete(cmd);
+ ret = cmd->se_tfo->queue_status(cmd);
+ break;
+ default:
+ break;
+ }
+
+out:
+ if (ret < 0) {
+ transport_handle_queue_full(cmd, cmd->se_dev);
+ return;
+ }
+ transport_lun_remove_cmd(cmd);
+ transport_cmd_check_stop_to_fabric(cmd);
+}
+
+static void transport_handle_queue_full(
+ struct se_cmd *cmd,
+ struct se_device *dev)
+{
+ spin_lock_irq(&dev->qf_cmd_lock);
+ list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
+ atomic_inc_mb(&dev->dev_qf_count);
+ spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
+
+ schedule_work(&cmd->se_dev->qf_work_queue);
+}
+
+static bool target_read_prot_action(struct se_cmd *cmd)
+{
+ sense_reason_t rc;
+
+ switch (cmd->prot_op) {
+ case TARGET_PROT_DIN_STRIP:
+ if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_STRIP)) {
+ rc = sbc_dif_read_strip(cmd);
+ if (rc) {
+ cmd->pi_err = rc;
+ return true;
+ }
+ }
+ break;
+ case TARGET_PROT_DIN_INSERT:
+ if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_INSERT)
+ break;
+
+ sbc_dif_generate(cmd);
+ break;
+ default:
+ break;
+ }
+
+ return false;
+}
+
+static void target_complete_ok_work(struct work_struct *work)
+{
+ struct se_cmd *cmd = container_of(work, struct se_cmd, work);
+ int ret;
+
+ /*
+ * Check if we need to move delayed/dormant tasks from cmds on the
+ * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
+ * Attribute.
+ */
+ transport_complete_task_attr(cmd);
+
+ /*
+ * Check to schedule QUEUE_FULL work, or execute an existing
+ * cmd->transport_qf_callback()
+ */
+ if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
+ schedule_work(&cmd->se_dev->qf_work_queue);
+
+ /*
+ * Check if we need to send a sense buffer from
+ * the struct se_cmd in question.
+ */
+ if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
+ WARN_ON(!cmd->scsi_status);
+ ret = transport_send_check_condition_and_sense(
+ cmd, 0, 1);
+ if (ret == -EAGAIN || ret == -ENOMEM)
+ goto queue_full;
+
+ transport_lun_remove_cmd(cmd);
+ transport_cmd_check_stop_to_fabric(cmd);
+ return;
+ }
+ /*
+ * Check for a callback, used by amongst other things
+ * XDWRITE_READ_10 and COMPARE_AND_WRITE emulation.
+ */
+ if (cmd->transport_complete_callback) {
+ sense_reason_t rc;
+
+ rc = cmd->transport_complete_callback(cmd, true);
+ if (!rc && !(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE_POST)) {
+ if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
+ !cmd->data_length)
+ goto queue_rsp;
+
+ return;
+ } else if (rc) {
+ ret = transport_send_check_condition_and_sense(cmd,
+ rc, 0);
+ if (ret == -EAGAIN || ret == -ENOMEM)
+ goto queue_full;
+
+ transport_lun_remove_cmd(cmd);
+ transport_cmd_check_stop_to_fabric(cmd);
+ return;
+ }
+ }
+
+queue_rsp:
+ switch (cmd->data_direction) {
+ case DMA_FROM_DEVICE:
+ spin_lock(&cmd->se_lun->lun_sep_lock);
+ if (cmd->se_lun->lun_sep) {
+ cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
+ cmd->data_length;
+ }
+ spin_unlock(&cmd->se_lun->lun_sep_lock);
+ /*
+ * Perform READ_STRIP of PI using software emulation when
+ * backend had PI enabled, if the transport will not be
+ * performing hardware READ_STRIP offload.
+ */
+ if (target_read_prot_action(cmd)) {
+ ret = transport_send_check_condition_and_sense(cmd,
+ cmd->pi_err, 0);
+ if (ret == -EAGAIN || ret == -ENOMEM)
+ goto queue_full;
+
+ transport_lun_remove_cmd(cmd);
+ transport_cmd_check_stop_to_fabric(cmd);
+ return;
+ }
+
+ trace_target_cmd_complete(cmd);
+ ret = cmd->se_tfo->queue_data_in(cmd);
+ if (ret == -EAGAIN || ret == -ENOMEM)
+ goto queue_full;
+ break;
+ case DMA_TO_DEVICE:
+ spin_lock(&cmd->se_lun->lun_sep_lock);
+ if (cmd->se_lun->lun_sep) {
+ cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
+ cmd->data_length;
+ }
+ spin_unlock(&cmd->se_lun->lun_sep_lock);
+ /*
+ * Check if we need to send READ payload for BIDI-COMMAND
+ */
+ if (cmd->se_cmd_flags & SCF_BIDI) {
+ spin_lock(&cmd->se_lun->lun_sep_lock);
+ if (cmd->se_lun->lun_sep) {
+ cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
+ cmd->data_length;
+ }
+ spin_unlock(&cmd->se_lun->lun_sep_lock);
+ ret = cmd->se_tfo->queue_data_in(cmd);
+ if (ret == -EAGAIN || ret == -ENOMEM)
+ goto queue_full;
+ break;
+ }
+ /* Fall through for DMA_TO_DEVICE */
+ case DMA_NONE:
+ trace_target_cmd_complete(cmd);
+ ret = cmd->se_tfo->queue_status(cmd);
+ if (ret == -EAGAIN || ret == -ENOMEM)
+ goto queue_full;
+ break;
+ default:
+ break;
+ }
+
+ transport_lun_remove_cmd(cmd);
+ transport_cmd_check_stop_to_fabric(cmd);
+ return;
+
+queue_full:
+ pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
+ " data_direction: %d\n", cmd, cmd->data_direction);
+ cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
+ transport_handle_queue_full(cmd, cmd->se_dev);
+}
+
+static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
+{
+ struct scatterlist *sg;
+ int count;
+
+ for_each_sg(sgl, sg, nents, count)
+ __free_page(sg_page(sg));
+
+ kfree(sgl);
+}
+
+static inline void transport_reset_sgl_orig(struct se_cmd *cmd)
+{
+ /*
+ * Check for saved t_data_sg that may be used for COMPARE_AND_WRITE
+ * emulation, and free + reset pointers if necessary..
+ */
+ if (!cmd->t_data_sg_orig)
+ return;
+
+ kfree(cmd->t_data_sg);
+ cmd->t_data_sg = cmd->t_data_sg_orig;
+ cmd->t_data_sg_orig = NULL;
+ cmd->t_data_nents = cmd->t_data_nents_orig;
+ cmd->t_data_nents_orig = 0;
+}
+
+static inline void transport_free_pages(struct se_cmd *cmd)
+{
+ if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) {
+ /*
+ * Release special case READ buffer payload required for
+ * SG_TO_MEM_NOALLOC to function with COMPARE_AND_WRITE
+ */
+ if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) {
+ transport_free_sgl(cmd->t_bidi_data_sg,
+ cmd->t_bidi_data_nents);
+ cmd->t_bidi_data_sg = NULL;
+ cmd->t_bidi_data_nents = 0;
+ }
+ transport_reset_sgl_orig(cmd);
+ return;
+ }
+ transport_reset_sgl_orig(cmd);
+
+ transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
+ cmd->t_data_sg = NULL;
+ cmd->t_data_nents = 0;
+
+ transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
+ cmd->t_bidi_data_sg = NULL;
+ cmd->t_bidi_data_nents = 0;
+
+ transport_free_sgl(cmd->t_prot_sg, cmd->t_prot_nents);
+ cmd->t_prot_sg = NULL;
+ cmd->t_prot_nents = 0;
+}
+
+/**
+ * transport_release_cmd - free a command
+ * @cmd: command to free
+ *
+ * This routine unconditionally frees a command, and reference counting
+ * or list removal must be done in the caller.
+ */
+static int transport_release_cmd(struct se_cmd *cmd)
+{
+ BUG_ON(!cmd->se_tfo);
+
+ if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
+ core_tmr_release_req(cmd->se_tmr_req);
+ if (cmd->t_task_cdb != cmd->__t_task_cdb)
+ kfree(cmd->t_task_cdb);
+ /*
+ * If this cmd has been setup with target_get_sess_cmd(), drop
+ * the kref and call ->release_cmd() in kref callback.
+ */
+ return target_put_sess_cmd(cmd->se_sess, cmd);
+}
+
+/**
+ * transport_put_cmd - release a reference to a command
+ * @cmd: command to release
+ *
+ * This routine releases our reference to the command and frees it if possible.
+ */
+static int transport_put_cmd(struct se_cmd *cmd)
+{
+ transport_free_pages(cmd);
+ return transport_release_cmd(cmd);
+}
+
+void *transport_kmap_data_sg(struct se_cmd *cmd)
+{
+ struct scatterlist *sg = cmd->t_data_sg;
+ struct page **pages;
+ int i;
+
+ /*
+ * We need to take into account a possible offset here for fabrics like
+ * tcm_loop who may be using a contig buffer from the SCSI midlayer for
+ * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
+ */
+ if (!cmd->t_data_nents)
+ return NULL;
+
+ BUG_ON(!sg);
+ if (cmd->t_data_nents == 1)
+ return kmap(sg_page(sg)) + sg->offset;
+
+ /* >1 page. use vmap */
+ pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
+ if (!pages)
+ return NULL;
+
+ /* convert sg[] to pages[] */
+ for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
+ pages[i] = sg_page(sg);
+ }
+
+ cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
+ kfree(pages);
+ if (!cmd->t_data_vmap)
+ return NULL;
+
+ return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
+}
+EXPORT_SYMBOL(transport_kmap_data_sg);
+
+void transport_kunmap_data_sg(struct se_cmd *cmd)
+{
+ if (!cmd->t_data_nents) {
+ return;
+ } else if (cmd->t_data_nents == 1) {
+ kunmap(sg_page(cmd->t_data_sg));
+ return;
+ }
+
+ vunmap(cmd->t_data_vmap);
+ cmd->t_data_vmap = NULL;
+}
+EXPORT_SYMBOL(transport_kunmap_data_sg);
+
+int
+target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, u32 length,
+ bool zero_page)
+{
+ struct scatterlist *sg;
+ struct page *page;
+ gfp_t zero_flag = (zero_page) ? __GFP_ZERO : 0;
+ unsigned int nent;
+ int i = 0;
+
+ nent = DIV_ROUND_UP(length, PAGE_SIZE);
+ sg = kmalloc(sizeof(struct scatterlist) * nent, GFP_KERNEL);
+ if (!sg)
+ return -ENOMEM;
+
+ sg_init_table(sg, nent);
+
+ while (length) {
+ u32 page_len = min_t(u32, length, PAGE_SIZE);
+ page = alloc_page(GFP_KERNEL | zero_flag);
+ if (!page)
+ goto out;
+
+ sg_set_page(&sg[i], page, page_len, 0);
+ length -= page_len;
+ i++;
+ }
+ *sgl = sg;
+ *nents = nent;
+ return 0;
+
+out:
+ while (i > 0) {
+ i--;
+ __free_page(sg_page(&sg[i]));
+ }
+ kfree(sg);
+ return -ENOMEM;
+}
+
+/*
+ * Allocate any required resources to execute the command. For writes we
+ * might not have the payload yet, so notify the fabric via a call to
+ * ->write_pending instead. Otherwise place it on the execution queue.
+ */
+sense_reason_t
+transport_generic_new_cmd(struct se_cmd *cmd)
+{
+ int ret = 0;
+ bool zero_flag = !(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB);
+
+ /*
+ * Determine is the TCM fabric module has already allocated physical
+ * memory, and is directly calling transport_generic_map_mem_to_cmd()
+ * beforehand.
+ */
+ if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
+ cmd->data_length) {
+
+ if ((cmd->se_cmd_flags & SCF_BIDI) ||
+ (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) {
+ u32 bidi_length;
+
+ if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)
+ bidi_length = cmd->t_task_nolb *
+ cmd->se_dev->dev_attrib.block_size;
+ else
+ bidi_length = cmd->data_length;
+
+ ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
+ &cmd->t_bidi_data_nents,
+ bidi_length, zero_flag);
+ if (ret < 0)
+ return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
+ }
+
+ if (cmd->prot_op != TARGET_PROT_NORMAL) {
+ ret = target_alloc_sgl(&cmd->t_prot_sg,
+ &cmd->t_prot_nents,
+ cmd->prot_length, true);
+ if (ret < 0)
+ return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
+ }
+
+ ret = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
+ cmd->data_length, zero_flag);
+ if (ret < 0)
+ return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
+ } else if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
+ cmd->data_length) {
+ /*
+ * Special case for COMPARE_AND_WRITE with fabrics
+ * using SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC.
+ */
+ u32 caw_length = cmd->t_task_nolb *
+ cmd->se_dev->dev_attrib.block_size;
+
+ ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
+ &cmd->t_bidi_data_nents,
+ caw_length, zero_flag);
+ if (ret < 0)
+ return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
+ }
+ /*
+ * If this command is not a write we can execute it right here,
+ * for write buffers we need to notify the fabric driver first
+ * and let it call back once the write buffers are ready.
+ */
+ target_add_to_state_list(cmd);
+ if (cmd->data_direction != DMA_TO_DEVICE || cmd->data_length == 0) {
+ target_execute_cmd(cmd);
+ return 0;
+ }
+ transport_cmd_check_stop(cmd, false, true);
+
+ ret = cmd->se_tfo->write_pending(cmd);
+ if (ret == -EAGAIN || ret == -ENOMEM)
+ goto queue_full;
+
+ /* fabric drivers should only return -EAGAIN or -ENOMEM as error */
+ WARN_ON(ret);
+
+ return (!ret) ? 0 : TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
+
+queue_full:
+ pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
+ cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
+ transport_handle_queue_full(cmd, cmd->se_dev);
+ return 0;
+}
+EXPORT_SYMBOL(transport_generic_new_cmd);
+
+static void transport_write_pending_qf(struct se_cmd *cmd)
+{
+ int ret;
+
+ ret = cmd->se_tfo->write_pending(cmd);
+ if (ret == -EAGAIN || ret == -ENOMEM) {
+ pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
+ cmd);
+ transport_handle_queue_full(cmd, cmd->se_dev);
+ }
+}
+
+int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
+{
+ unsigned long flags;
+ int ret = 0;
+
+ if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
+ if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
+ transport_wait_for_tasks(cmd);
+
+ ret = transport_release_cmd(cmd);
+ } else {
+ if (wait_for_tasks)
+ transport_wait_for_tasks(cmd);
+ /*
+ * Handle WRITE failure case where transport_generic_new_cmd()
+ * has already added se_cmd to state_list, but fabric has
+ * failed command before I/O submission.
+ */
+ if (cmd->state_active) {
+ spin_lock_irqsave(&cmd->t_state_lock, flags);
+ target_remove_from_state_list(cmd);
+ spin_unlock_irqrestore(&cmd->t_state_lock, flags);
+ }
+
+ if (cmd->se_lun)
+ transport_lun_remove_cmd(cmd);
+
+ ret = transport_put_cmd(cmd);
+ }
+ return ret;
+}
+EXPORT_SYMBOL(transport_generic_free_cmd);
+
+/* target_get_sess_cmd - Add command to active ->sess_cmd_list
+ * @se_sess: session to reference
+ * @se_cmd: command descriptor to add
+ * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
+ */
+int target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
+ bool ack_kref)
+{
+ unsigned long flags;
+ int ret = 0;
+
+ /*
+ * Add a second kref if the fabric caller is expecting to handle
+ * fabric acknowledgement that requires two target_put_sess_cmd()
+ * invocations before se_cmd descriptor release.
+ */
+ if (ack_kref)
+ kref_get(&se_cmd->cmd_kref);
+
+ spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
+ if (se_sess->sess_tearing_down) {
+ ret = -ESHUTDOWN;
+ goto out;
+ }
+ list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
+out:
+ spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
+
+ if (ret && ack_kref)
+ target_put_sess_cmd(se_sess, se_cmd);
+
+ return ret;
+}
+EXPORT_SYMBOL(target_get_sess_cmd);
+
+static void target_release_cmd_kref(struct kref *kref)
+ __releases(&se_cmd->se_sess->sess_cmd_lock)
+{
+ struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
+ struct se_session *se_sess = se_cmd->se_sess;
+
+ if (list_empty(&se_cmd->se_cmd_list)) {
+ spin_unlock(&se_sess->sess_cmd_lock);
+ se_cmd->se_tfo->release_cmd(se_cmd);
+ return;
+ }
+ if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
+ spin_unlock(&se_sess->sess_cmd_lock);
+ complete(&se_cmd->cmd_wait_comp);
+ return;
+ }
+ list_del(&se_cmd->se_cmd_list);
+ spin_unlock(&se_sess->sess_cmd_lock);
+
+ se_cmd->se_tfo->release_cmd(se_cmd);
+}
+
+/* target_put_sess_cmd - Check for active I/O shutdown via kref_put
+ * @se_sess: session to reference
+ * @se_cmd: command descriptor to drop
+ */
+int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
+{
+ if (!se_sess) {
+ se_cmd->se_tfo->release_cmd(se_cmd);
+ return 1;
+ }
+ return kref_put_spinlock_irqsave(&se_cmd->cmd_kref, target_release_cmd_kref,
+ &se_sess->sess_cmd_lock);
+}
+EXPORT_SYMBOL(target_put_sess_cmd);
+
+/* target_sess_cmd_list_set_waiting - Flag all commands in
+ * sess_cmd_list to complete cmd_wait_comp. Set
+ * sess_tearing_down so no more commands are queued.
+ * @se_sess: session to flag
+ */
+void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
+{
+ struct se_cmd *se_cmd;
+ unsigned long flags;
+
+ spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
+ if (se_sess->sess_tearing_down) {
+ spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
+ return;
+ }
+ se_sess->sess_tearing_down = 1;
+ list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
+
+ list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
+ se_cmd->cmd_wait_set = 1;
+
+ spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
+}
+EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
+
+/* target_wait_for_sess_cmds - Wait for outstanding descriptors
+ * @se_sess: session to wait for active I/O
+ */
+void target_wait_for_sess_cmds(struct se_session *se_sess)
+{
+ struct se_cmd *se_cmd, *tmp_cmd;
+ unsigned long flags;
+
+ list_for_each_entry_safe(se_cmd, tmp_cmd,
+ &se_sess->sess_wait_list, se_cmd_list) {
+ list_del(&se_cmd->se_cmd_list);
+
+ pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
+ " %d\n", se_cmd, se_cmd->t_state,
+ se_cmd->se_tfo->get_cmd_state(se_cmd));
+
+ wait_for_completion(&se_cmd->cmd_wait_comp);
+ pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
+ " fabric state: %d\n", se_cmd, se_cmd->t_state,
+ se_cmd->se_tfo->get_cmd_state(se_cmd));
+
+ se_cmd->se_tfo->release_cmd(se_cmd);
+ }
+
+ spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
+ WARN_ON(!list_empty(&se_sess->sess_cmd_list));
+ spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
+
+}
+EXPORT_SYMBOL(target_wait_for_sess_cmds);
+
+static int transport_clear_lun_ref_thread(void *p)
+{
+ struct se_lun *lun = p;
+
+ percpu_ref_kill(&lun->lun_ref);
+
+ wait_for_completion(&lun->lun_ref_comp);
+ complete(&lun->lun_shutdown_comp);
+
+ return 0;
+}
+
+int transport_clear_lun_ref(struct se_lun *lun)
+{
+ struct task_struct *kt;
+
+ kt = kthread_run(transport_clear_lun_ref_thread, lun,
+ "tcm_cl_%u", lun->unpacked_lun);
+ if (IS_ERR(kt)) {
+ pr_err("Unable to start clear_lun thread\n");
+ return PTR_ERR(kt);
+ }
+ wait_for_completion(&lun->lun_shutdown_comp);
+
+ return 0;
+}
+
+/**
+ * transport_wait_for_tasks - wait for completion to occur
+ * @cmd: command to wait
+ *
+ * Called from frontend fabric context to wait for storage engine
+ * to pause and/or release frontend generated struct se_cmd.
+ */
+bool transport_wait_for_tasks(struct se_cmd *cmd)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&cmd->t_state_lock, flags);
+ if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
+ !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
+ spin_unlock_irqrestore(&cmd->t_state_lock, flags);
+ return false;
+ }
+
+ if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
+ !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
+ spin_unlock_irqrestore(&cmd->t_state_lock, flags);
+ return false;
+ }
+
+ if (!(cmd->transport_state & CMD_T_ACTIVE)) {
+ spin_unlock_irqrestore(&cmd->t_state_lock, flags);
+ return false;
+ }
+
+ cmd->transport_state |= CMD_T_STOP;
+
+ pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
+ " i_state: %d, t_state: %d, CMD_T_STOP\n",
+ cmd, cmd->se_tfo->get_task_tag(cmd),
+ cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
+
+ spin_unlock_irqrestore(&cmd->t_state_lock, flags);
+
+ wait_for_completion(&cmd->t_transport_stop_comp);
+
+ spin_lock_irqsave(&cmd->t_state_lock, flags);
+ cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
+
+ pr_debug("wait_for_tasks: Stopped wait_for_completion("
+ "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
+ cmd->se_tfo->get_task_tag(cmd));
+
+ spin_unlock_irqrestore(&cmd->t_state_lock, flags);
+
+ return true;
+}
+EXPORT_SYMBOL(transport_wait_for_tasks);
+
+static int transport_get_sense_codes(
+ struct se_cmd *cmd,
+ u8 *asc,
+ u8 *ascq)
+{
+ *asc = cmd->scsi_asc;
+ *ascq = cmd->scsi_ascq;
+
+ return 0;
+}
+
+static
+void transport_err_sector_info(unsigned char *buffer, sector_t bad_sector)
+{
+ /* Place failed LBA in sense data information descriptor 0. */
+ buffer[SPC_ADD_SENSE_LEN_OFFSET] = 0xc;
+ buffer[SPC_DESC_TYPE_OFFSET] = 0; /* Information */
+ buffer[SPC_ADDITIONAL_DESC_LEN_OFFSET] = 0xa;
+ buffer[SPC_VALIDITY_OFFSET] = 0x80;
+
+ /* Descriptor Information: failing sector */
+ put_unaligned_be64(bad_sector, &buffer[12]);
+}
+
+int
+transport_send_check_condition_and_sense(struct se_cmd *cmd,
+ sense_reason_t reason, int from_transport)
+{
+ unsigned char *buffer = cmd->sense_buffer;
+ unsigned long flags;
+ u8 asc = 0, ascq = 0;
+
+ spin_lock_irqsave(&cmd->t_state_lock, flags);
+ if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
+ spin_unlock_irqrestore(&cmd->t_state_lock, flags);
+ return 0;
+ }
+ cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
+ spin_unlock_irqrestore(&cmd->t_state_lock, flags);
+
+ if (!reason && from_transport)
+ goto after_reason;
+
+ if (!from_transport)
+ cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
+
+ /*
+ * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
+ * SENSE KEY values from include/scsi/scsi.h
+ */
+ switch (reason) {
+ case TCM_NO_SENSE:
+ /* CURRENT ERROR */
+ buffer[0] = 0x70;
+ buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
+ /* Not Ready */
+ buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
+ /* NO ADDITIONAL SENSE INFORMATION */
+ buffer[SPC_ASC_KEY_OFFSET] = 0;
+ buffer[SPC_ASCQ_KEY_OFFSET] = 0;
+ break;
+ case TCM_NON_EXISTENT_LUN:
+ /* CURRENT ERROR */
+ buffer[0] = 0x70;
+ buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
+ /* ILLEGAL REQUEST */
+ buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
+ /* LOGICAL UNIT NOT SUPPORTED */
+ buffer[SPC_ASC_KEY_OFFSET] = 0x25;
+ break;
+ case TCM_UNSUPPORTED_SCSI_OPCODE:
+ case TCM_SECTOR_COUNT_TOO_MANY:
+ /* CURRENT ERROR */
+ buffer[0] = 0x70;
+ buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
+ /* ILLEGAL REQUEST */
+ buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
+ /* INVALID COMMAND OPERATION CODE */
+ buffer[SPC_ASC_KEY_OFFSET] = 0x20;
+ break;
+ case TCM_UNKNOWN_MODE_PAGE:
+ /* CURRENT ERROR */
+ buffer[0] = 0x70;
+ buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
+ /* ILLEGAL REQUEST */
+ buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
+ /* INVALID FIELD IN CDB */
+ buffer[SPC_ASC_KEY_OFFSET] = 0x24;
+ break;
+ case TCM_CHECK_CONDITION_ABORT_CMD:
+ /* CURRENT ERROR */
+ buffer[0] = 0x70;
+ buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
+ /* ABORTED COMMAND */
+ buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
+ /* BUS DEVICE RESET FUNCTION OCCURRED */
+ buffer[SPC_ASC_KEY_OFFSET] = 0x29;
+ buffer[SPC_ASCQ_KEY_OFFSET] = 0x03;
+ break;
+ case TCM_INCORRECT_AMOUNT_OF_DATA:
+ /* CURRENT ERROR */
+ buffer[0] = 0x70;
+ buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
+ /* ABORTED COMMAND */
+ buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
+ /* WRITE ERROR */
+ buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
+ /* NOT ENOUGH UNSOLICITED DATA */
+ buffer[SPC_ASCQ_KEY_OFFSET] = 0x0d;
+ break;
+ case TCM_INVALID_CDB_FIELD:
+ /* CURRENT ERROR */
+ buffer[0] = 0x70;
+ buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
+ /* ILLEGAL REQUEST */
+ buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
+ /* INVALID FIELD IN CDB */
+ buffer[SPC_ASC_KEY_OFFSET] = 0x24;
+ break;
+ case TCM_INVALID_PARAMETER_LIST:
+ /* CURRENT ERROR */
+ buffer[0] = 0x70;
+ buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
+ /* ILLEGAL REQUEST */
+ buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
+ /* INVALID FIELD IN PARAMETER LIST */
+ buffer[SPC_ASC_KEY_OFFSET] = 0x26;
+ break;
+ case TCM_PARAMETER_LIST_LENGTH_ERROR:
+ /* CURRENT ERROR */
+ buffer[0] = 0x70;
+ buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
+ /* ILLEGAL REQUEST */
+ buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
+ /* PARAMETER LIST LENGTH ERROR */
+ buffer[SPC_ASC_KEY_OFFSET] = 0x1a;
+ break;
+ case TCM_UNEXPECTED_UNSOLICITED_DATA:
+ /* CURRENT ERROR */
+ buffer[0] = 0x70;
+ buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
+ /* ABORTED COMMAND */
+ buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
+ /* WRITE ERROR */
+ buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
+ /* UNEXPECTED_UNSOLICITED_DATA */
+ buffer[SPC_ASCQ_KEY_OFFSET] = 0x0c;
+ break;
+ case TCM_SERVICE_CRC_ERROR:
+ /* CURRENT ERROR */
+ buffer[0] = 0x70;
+ buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
+ /* ABORTED COMMAND */
+ buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
+ /* PROTOCOL SERVICE CRC ERROR */
+ buffer[SPC_ASC_KEY_OFFSET] = 0x47;
+ /* N/A */
+ buffer[SPC_ASCQ_KEY_OFFSET] = 0x05;
+ break;
+ case TCM_SNACK_REJECTED:
+ /* CURRENT ERROR */
+ buffer[0] = 0x70;
+ buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
+ /* ABORTED COMMAND */
+ buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
+ /* READ ERROR */
+ buffer[SPC_ASC_KEY_OFFSET] = 0x11;
+ /* FAILED RETRANSMISSION REQUEST */
+ buffer[SPC_ASCQ_KEY_OFFSET] = 0x13;
+ break;
+ case TCM_WRITE_PROTECTED:
+ /* CURRENT ERROR */
+ buffer[0] = 0x70;
+ buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
+ /* DATA PROTECT */
+ buffer[SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
+ /* WRITE PROTECTED */
+ buffer[SPC_ASC_KEY_OFFSET] = 0x27;
+ break;
+ case TCM_ADDRESS_OUT_OF_RANGE:
+ /* CURRENT ERROR */
+ buffer[0] = 0x70;
+ buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
+ /* ILLEGAL REQUEST */
+ buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
+ /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
+ buffer[SPC_ASC_KEY_OFFSET] = 0x21;
+ break;
+ case TCM_CHECK_CONDITION_UNIT_ATTENTION:
+ /* CURRENT ERROR */
+ buffer[0] = 0x70;
+ buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
+ /* UNIT ATTENTION */
+ buffer[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
+ core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
+ buffer[SPC_ASC_KEY_OFFSET] = asc;
+ buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
+ break;
+ case TCM_CHECK_CONDITION_NOT_READY:
+ /* CURRENT ERROR */
+ buffer[0] = 0x70;
+ buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
+ /* Not Ready */
+ buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
+ transport_get_sense_codes(cmd, &asc, &ascq);
+ buffer[SPC_ASC_KEY_OFFSET] = asc;
+ buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
+ break;
+ case TCM_MISCOMPARE_VERIFY:
+ /* CURRENT ERROR */
+ buffer[0] = 0x70;
+ buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
+ buffer[SPC_SENSE_KEY_OFFSET] = MISCOMPARE;
+ /* MISCOMPARE DURING VERIFY OPERATION */
+ buffer[SPC_ASC_KEY_OFFSET] = 0x1d;
+ buffer[SPC_ASCQ_KEY_OFFSET] = 0x00;
+ break;
+ case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED:
+ /* CURRENT ERROR */
+ buffer[0] = 0x70;
+ buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
+ /* ILLEGAL REQUEST */
+ buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
+ /* LOGICAL BLOCK GUARD CHECK FAILED */
+ buffer[SPC_ASC_KEY_OFFSET] = 0x10;
+ buffer[SPC_ASCQ_KEY_OFFSET] = 0x01;
+ transport_err_sector_info(buffer, cmd->bad_sector);
+ break;
+ case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED:
+ /* CURRENT ERROR */
+ buffer[0] = 0x70;
+ buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
+ /* ILLEGAL REQUEST */
+ buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
+ /* LOGICAL BLOCK APPLICATION TAG CHECK FAILED */
+ buffer[SPC_ASC_KEY_OFFSET] = 0x10;
+ buffer[SPC_ASCQ_KEY_OFFSET] = 0x02;
+ transport_err_sector_info(buffer, cmd->bad_sector);
+ break;
+ case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED:
+ /* CURRENT ERROR */
+ buffer[0] = 0x70;
+ buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
+ /* ILLEGAL REQUEST */
+ buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
+ /* LOGICAL BLOCK REFERENCE TAG CHECK FAILED */
+ buffer[SPC_ASC_KEY_OFFSET] = 0x10;
+ buffer[SPC_ASCQ_KEY_OFFSET] = 0x03;
+ transport_err_sector_info(buffer, cmd->bad_sector);
+ break;
+ case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
+ default:
+ /* CURRENT ERROR */
+ buffer[0] = 0x70;
+ buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
+ /*
+ * Returning ILLEGAL REQUEST would cause immediate IO errors on
+ * Solaris initiators. Returning NOT READY instead means the
+ * operations will be retried a finite number of times and we
+ * can survive intermittent errors.
+ */
+ buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
+ /* LOGICAL UNIT COMMUNICATION FAILURE */
+ buffer[SPC_ASC_KEY_OFFSET] = 0x08;
+ break;
+ }
+ /*
+ * This code uses linux/include/scsi/scsi.h SAM status codes!
+ */
+ cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
+ /*
+ * Automatically padded, this value is encoded in the fabric's
+ * data_length response PDU containing the SCSI defined sense data.
+ */
+ cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
+
+after_reason:
+ trace_target_cmd_complete(cmd);
+ return cmd->se_tfo->queue_status(cmd);
+}
+EXPORT_SYMBOL(transport_send_check_condition_and_sense);
+
+int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
+{
+ if (!(cmd->transport_state & CMD_T_ABORTED))
+ return 0;
+
+ /*
+ * If cmd has been aborted but either no status is to be sent or it has
+ * already been sent, just return
+ */
+ if (!send_status || !(cmd->se_cmd_flags & SCF_SEND_DELAYED_TAS))
+ return 1;
+
+ pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB: 0x%02x ITT: 0x%08x\n",
+ cmd->t_task_cdb[0], cmd->se_tfo->get_task_tag(cmd));
+
+ cmd->se_cmd_flags &= ~SCF_SEND_DELAYED_TAS;
+ cmd->scsi_status = SAM_STAT_TASK_ABORTED;
+ trace_target_cmd_complete(cmd);
+ cmd->se_tfo->queue_status(cmd);
+
+ return 1;
+}
+EXPORT_SYMBOL(transport_check_aborted_status);
+
+void transport_send_task_abort(struct se_cmd *cmd)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&cmd->t_state_lock, flags);
+ if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION)) {
+ spin_unlock_irqrestore(&cmd->t_state_lock, flags);
+ return;
+ }
+ spin_unlock_irqrestore(&cmd->t_state_lock, flags);
+
+ /*
+ * If there are still expected incoming fabric WRITEs, we wait
+ * until until they have completed before sending a TASK_ABORTED
+ * response. This response with TASK_ABORTED status will be
+ * queued back to fabric module by transport_check_aborted_status().
+ */
+ if (cmd->data_direction == DMA_TO_DEVICE) {
+ if (cmd->se_tfo->write_pending_status(cmd) != 0) {
+ cmd->transport_state |= CMD_T_ABORTED;
+ cmd->se_cmd_flags |= SCF_SEND_DELAYED_TAS;
+ return;
+ }
+ }
+ cmd->scsi_status = SAM_STAT_TASK_ABORTED;
+
+ transport_lun_remove_cmd(cmd);
+
+ pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
+ " ITT: 0x%08x\n", cmd->t_task_cdb[0],
+ cmd->se_tfo->get_task_tag(cmd));
+
+ trace_target_cmd_complete(cmd);
+ cmd->se_tfo->queue_status(cmd);
+}
+
+static void target_tmr_work(struct work_struct *work)
+{
+ struct se_cmd *cmd = container_of(work, struct se_cmd, work);
+ struct se_device *dev = cmd->se_dev;
+ struct se_tmr_req *tmr = cmd->se_tmr_req;
+ int ret;
+
+ switch (tmr->function) {
+ case TMR_ABORT_TASK:
+ core_tmr_abort_task(dev, tmr, cmd->se_sess);
+ break;
+ case TMR_ABORT_TASK_SET:
+ case TMR_CLEAR_ACA:
+ case TMR_CLEAR_TASK_SET:
+ tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
+ break;
+ case TMR_LUN_RESET:
+ ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
+ tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
+ TMR_FUNCTION_REJECTED;
+ break;
+ case TMR_TARGET_WARM_RESET:
+ tmr->response = TMR_FUNCTION_REJECTED;
+ break;
+ case TMR_TARGET_COLD_RESET:
+ tmr->response = TMR_FUNCTION_REJECTED;
+ break;
+ default:
+ pr_err("Uknown TMR function: 0x%02x.\n",
+ tmr->function);
+ tmr->response = TMR_FUNCTION_REJECTED;
+ break;
+ }
+
+ cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
+ cmd->se_tfo->queue_tm_rsp(cmd);
+
+ transport_cmd_check_stop_to_fabric(cmd);
+}
+
+int transport_generic_handle_tmr(
+ struct se_cmd *cmd)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&cmd->t_state_lock, flags);
+ cmd->transport_state |= CMD_T_ACTIVE;
+ spin_unlock_irqrestore(&cmd->t_state_lock, flags);
+
+ INIT_WORK(&cmd->work, target_tmr_work);
+ queue_work(cmd->se_dev->tmr_wq, &cmd->work);
+ return 0;
+}
+EXPORT_SYMBOL(transport_generic_handle_tmr);
Code Review / kvmfornfv.git / blobdiff