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path: root/drivers/target/target_core_transport.c
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Diffstat (limited to 'drivers/target/target_core_transport.c')
-rw-r--r--drivers/target/target_core_transport.c6134
1 files changed, 6134 insertions, 0 deletions
diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
new file mode 100644
index 00000000000..28b6292ff29
--- /dev/null
+++ b/drivers/target/target_core_transport.c
@@ -0,0 +1,6134 @@
+/*******************************************************************************
+ * Filename: target_core_transport.c
+ *
+ * This file contains the Generic Target Engine Core.
+ *
+ * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
+ * Copyright (c) 2005, 2006, 2007 SBE, Inc.
+ * Copyright (c) 2007-2010 Rising Tide Systems
+ * Copyright (c) 2008-2010 Linux-iSCSI.org
+ *
+ * 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/version.h>
+#include <linux/net.h>
+#include <linux/delay.h>
+#include <linux/string.h>
+#include <linux/timer.h>
+#include <linux/slab.h>
+#include <linux/blkdev.h>
+#include <linux/spinlock.h>
+#include <linux/smp_lock.h>
+#include <linux/kthread.h>
+#include <linux/in.h>
+#include <linux/cdrom.h>
+#include <asm/unaligned.h>
+#include <net/sock.h>
+#include <net/tcp.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/libsas.h> /* For TASK_ATTR_* */
+
+#include <target/target_core_base.h>
+#include <target/target_core_device.h>
+#include <target/target_core_tmr.h>
+#include <target/target_core_tpg.h>
+#include <target/target_core_transport.h>
+#include <target/target_core_fabric_ops.h>
+#include <target/target_core_configfs.h>
+
+#include "target_core_alua.h"
+#include "target_core_hba.h"
+#include "target_core_pr.h"
+#include "target_core_scdb.h"
+#include "target_core_ua.h"
+
+/* #define DEBUG_CDB_HANDLER */
+#ifdef DEBUG_CDB_HANDLER
+#define DEBUG_CDB_H(x...) printk(KERN_INFO x)
+#else
+#define DEBUG_CDB_H(x...)
+#endif
+
+/* #define DEBUG_CMD_MAP */
+#ifdef DEBUG_CMD_MAP
+#define DEBUG_CMD_M(x...) printk(KERN_INFO x)
+#else
+#define DEBUG_CMD_M(x...)
+#endif
+
+/* #define DEBUG_MEM_ALLOC */
+#ifdef DEBUG_MEM_ALLOC
+#define DEBUG_MEM(x...) printk(KERN_INFO x)
+#else
+#define DEBUG_MEM(x...)
+#endif
+
+/* #define DEBUG_MEM2_ALLOC */
+#ifdef DEBUG_MEM2_ALLOC
+#define DEBUG_MEM2(x...) printk(KERN_INFO x)
+#else
+#define DEBUG_MEM2(x...)
+#endif
+
+/* #define DEBUG_SG_CALC */
+#ifdef DEBUG_SG_CALC
+#define DEBUG_SC(x...) printk(KERN_INFO x)
+#else
+#define DEBUG_SC(x...)
+#endif
+
+/* #define DEBUG_SE_OBJ */
+#ifdef DEBUG_SE_OBJ
+#define DEBUG_SO(x...) printk(KERN_INFO x)
+#else
+#define DEBUG_SO(x...)
+#endif
+
+/* #define DEBUG_CMD_VOL */
+#ifdef DEBUG_CMD_VOL
+#define DEBUG_VOL(x...) printk(KERN_INFO x)
+#else
+#define DEBUG_VOL(x...)
+#endif
+
+/* #define DEBUG_CMD_STOP */
+#ifdef DEBUG_CMD_STOP
+#define DEBUG_CS(x...) printk(KERN_INFO x)
+#else
+#define DEBUG_CS(x...)
+#endif
+
+/* #define DEBUG_PASSTHROUGH */
+#ifdef DEBUG_PASSTHROUGH
+#define DEBUG_PT(x...) printk(KERN_INFO x)
+#else
+#define DEBUG_PT(x...)
+#endif
+
+/* #define DEBUG_TASK_STOP */
+#ifdef DEBUG_TASK_STOP
+#define DEBUG_TS(x...) printk(KERN_INFO x)
+#else
+#define DEBUG_TS(x...)
+#endif
+
+/* #define DEBUG_TRANSPORT_STOP */
+#ifdef DEBUG_TRANSPORT_STOP
+#define DEBUG_TRANSPORT_S(x...) printk(KERN_INFO x)
+#else
+#define DEBUG_TRANSPORT_S(x...)
+#endif
+
+/* #define DEBUG_TASK_FAILURE */
+#ifdef DEBUG_TASK_FAILURE
+#define DEBUG_TF(x...) printk(KERN_INFO x)
+#else
+#define DEBUG_TF(x...)
+#endif
+
+/* #define DEBUG_DEV_OFFLINE */
+#ifdef DEBUG_DEV_OFFLINE
+#define DEBUG_DO(x...) printk(KERN_INFO x)
+#else
+#define DEBUG_DO(x...)
+#endif
+
+/* #define DEBUG_TASK_STATE */
+#ifdef DEBUG_TASK_STATE
+#define DEBUG_TSTATE(x...) printk(KERN_INFO x)
+#else
+#define DEBUG_TSTATE(x...)
+#endif
+
+/* #define DEBUG_STATUS_THR */
+#ifdef DEBUG_STATUS_THR
+#define DEBUG_ST(x...) printk(KERN_INFO x)
+#else
+#define DEBUG_ST(x...)
+#endif
+
+/* #define DEBUG_TASK_TIMEOUT */
+#ifdef DEBUG_TASK_TIMEOUT
+#define DEBUG_TT(x...) printk(KERN_INFO x)
+#else
+#define DEBUG_TT(x...)
+#endif
+
+/* #define DEBUG_GENERIC_REQUEST_FAILURE */
+#ifdef DEBUG_GENERIC_REQUEST_FAILURE
+#define DEBUG_GRF(x...) printk(KERN_INFO x)
+#else
+#define DEBUG_GRF(x...)
+#endif
+
+/* #define DEBUG_SAM_TASK_ATTRS */
+#ifdef DEBUG_SAM_TASK_ATTRS
+#define DEBUG_STA(x...) printk(KERN_INFO x)
+#else
+#define DEBUG_STA(x...)
+#endif
+
+struct se_global *se_global;
+
+static struct kmem_cache *se_cmd_cache;
+static struct kmem_cache *se_sess_cache;
+struct kmem_cache *se_tmr_req_cache;
+struct kmem_cache *se_ua_cache;
+struct kmem_cache *se_mem_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;
+
+/* Used for transport_dev_get_map_*() */
+typedef int (*map_func_t)(struct se_task *, u32);
+
+static int transport_generic_write_pending(struct se_cmd *);
+static int transport_processing_thread(void *);
+static int __transport_execute_tasks(struct se_device *dev);
+static void transport_complete_task_attr(struct se_cmd *cmd);
+static void transport_direct_request_timeout(struct se_cmd *cmd);
+static void transport_free_dev_tasks(struct se_cmd *cmd);
+static u32 transport_generic_get_cdb_count(struct se_cmd *cmd,
+ unsigned long long starting_lba, u32 sectors,
+ enum dma_data_direction data_direction,
+ struct list_head *mem_list, int set_counts);
+static int transport_generic_get_mem(struct se_cmd *cmd, u32 length,
+ u32 dma_size);
+static int transport_generic_remove(struct se_cmd *cmd,
+ int release_to_pool, int session_reinstatement);
+static int transport_get_sectors(struct se_cmd *cmd);
+static struct list_head *transport_init_se_mem_list(void);
+static int transport_map_sg_to_mem(struct se_cmd *cmd,
+ struct list_head *se_mem_list, void *in_mem,
+ u32 *se_mem_cnt);
+static void transport_memcpy_se_mem_read_contig(struct se_cmd *cmd,
+ unsigned char *dst, struct list_head *se_mem_list);
+static void transport_release_fe_cmd(struct se_cmd *cmd);
+static void transport_remove_cmd_from_queue(struct se_cmd *cmd,
+ struct se_queue_obj *qobj);
+static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
+static void transport_stop_all_task_timers(struct se_cmd *cmd);
+
+int transport_emulate_control_cdb(struct se_task *task);
+
+int init_se_global(void)
+{
+ struct se_global *global;
+
+ global = kzalloc(sizeof(struct se_global), GFP_KERNEL);
+ if (!(global)) {
+ printk(KERN_ERR "Unable to allocate memory for struct se_global\n");
+ return -1;
+ }
+
+ INIT_LIST_HEAD(&global->g_lu_gps_list);
+ INIT_LIST_HEAD(&global->g_se_tpg_list);
+ INIT_LIST_HEAD(&global->g_hba_list);
+ INIT_LIST_HEAD(&global->g_se_dev_list);
+ spin_lock_init(&global->g_device_lock);
+ spin_lock_init(&global->hba_lock);
+ spin_lock_init(&global->se_tpg_lock);
+ spin_lock_init(&global->lu_gps_lock);
+ spin_lock_init(&global->plugin_class_lock);
+
+ se_cmd_cache = kmem_cache_create("se_cmd_cache",
+ sizeof(struct se_cmd), __alignof__(struct se_cmd), 0, NULL);
+ if (!(se_cmd_cache)) {
+ printk(KERN_ERR "kmem_cache_create for struct se_cmd failed\n");
+ goto out;
+ }
+ se_tmr_req_cache = kmem_cache_create("se_tmr_cache",
+ sizeof(struct se_tmr_req), __alignof__(struct se_tmr_req),
+ 0, NULL);
+ if (!(se_tmr_req_cache)) {
+ printk(KERN_ERR "kmem_cache_create() for struct se_tmr_req"
+ " failed\n");
+ goto out;
+ }
+ se_sess_cache = kmem_cache_create("se_sess_cache",
+ sizeof(struct se_session), __alignof__(struct se_session),
+ 0, NULL);
+ if (!(se_sess_cache)) {
+ printk(KERN_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)) {
+ printk(KERN_ERR "kmem_cache_create() for struct se_ua failed\n");
+ goto out;
+ }
+ se_mem_cache = kmem_cache_create("se_mem_cache",
+ sizeof(struct se_mem), __alignof__(struct se_mem), 0, NULL);
+ if (!(se_mem_cache)) {
+ printk(KERN_ERR "kmem_cache_create() for struct se_mem failed\n");
+ goto out;
+ }
+ 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)) {
+ printk(KERN_ERR "kmem_cache_create() for struct t10_pr_registration"
+ " failed\n");
+ goto out;
+ }
+ 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)) {
+ printk(KERN_ERR "kmem_cache_create() for t10_alua_lu_gp_cache"
+ " failed\n");
+ goto out;
+ }
+ 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)) {
+ printk(KERN_ERR "kmem_cache_create() for t10_alua_lu_gp_mem_"
+ "cache failed\n");
+ goto out;
+ }
+ 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)) {
+ printk(KERN_ERR "kmem_cache_create() for t10_alua_tg_pt_gp_"
+ "cache failed\n");
+ goto out;
+ }
+ 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)) {
+ printk(KERN_ERR "kmem_cache_create() for t10_alua_tg_pt_gp_"
+ "mem_t failed\n");
+ goto out;
+ }
+
+ se_global = global;
+
+ return 0;
+out:
+ if (se_cmd_cache)
+ kmem_cache_destroy(se_cmd_cache);
+ if (se_tmr_req_cache)
+ kmem_cache_destroy(se_tmr_req_cache);
+ if (se_sess_cache)
+ kmem_cache_destroy(se_sess_cache);
+ if (se_ua_cache)
+ kmem_cache_destroy(se_ua_cache);
+ if (se_mem_cache)
+ kmem_cache_destroy(se_mem_cache);
+ if (t10_pr_reg_cache)
+ kmem_cache_destroy(t10_pr_reg_cache);
+ if (t10_alua_lu_gp_cache)
+ kmem_cache_destroy(t10_alua_lu_gp_cache);
+ if (t10_alua_lu_gp_mem_cache)
+ kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
+ if (t10_alua_tg_pt_gp_cache)
+ kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
+ if (t10_alua_tg_pt_gp_mem_cache)
+ kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
+ kfree(global);
+ return -1;
+}
+
+void release_se_global(void)
+{
+ struct se_global *global;
+
+ global = se_global;
+ if (!(global))
+ return;
+
+ kmem_cache_destroy(se_cmd_cache);
+ kmem_cache_destroy(se_tmr_req_cache);
+ kmem_cache_destroy(se_sess_cache);
+ kmem_cache_destroy(se_ua_cache);
+ kmem_cache_destroy(se_mem_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);
+ kfree(global);
+
+ se_global = NULL;
+}
+
+void transport_init_queue_obj(struct se_queue_obj *qobj)
+{
+ atomic_set(&qobj->queue_cnt, 0);
+ INIT_LIST_HEAD(&qobj->qobj_list);
+ init_waitqueue_head(&qobj->thread_wq);
+ spin_lock_init(&qobj->cmd_queue_lock);
+}
+EXPORT_SYMBOL(transport_init_queue_obj);
+
+static int transport_subsystem_reqmods(void)
+{
+ int ret;
+
+ ret = request_module("target_core_iblock");
+ if (ret != 0)
+ printk(KERN_ERR "Unable to load target_core_iblock\n");
+
+ ret = request_module("target_core_file");
+ if (ret != 0)
+ printk(KERN_ERR "Unable to load target_core_file\n");
+
+ ret = request_module("target_core_pscsi");
+ if (ret != 0)
+ printk(KERN_ERR "Unable to load target_core_pscsi\n");
+
+ ret = request_module("target_core_stgt");
+ if (ret != 0)
+ printk(KERN_ERR "Unable to load target_core_stgt\n");
+
+ return 0;
+}
+
+int transport_subsystem_check_init(void)
+{
+ if (se_global->g_sub_api_initialized)
+ return 0;
+ /*
+ * Request the loading of known TCM subsystem plugins..
+ */
+ if (transport_subsystem_reqmods() < 0)
+ return -1;
+
+ se_global->g_sub_api_initialized = 1;
+ return 0;
+}
+
+struct se_session *transport_init_session(void)
+{
+ struct se_session *se_sess;
+
+ se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
+ if (!(se_sess)) {
+ printk(KERN_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);
+ atomic_set(&se_sess->mib_ref_count, 0);
+
+ return se_sess;
+}
+EXPORT_SYMBOL(transport_init_session);
+
+/*
+ * Called with spin_lock_bh(&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)
+{
+ 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) {
+ /*
+ * If the fabric module supports an ISID based TransportID,
+ * save this value in binary from the fabric I_T Nexus now.
+ */
+ if (TPG_TFO(se_tpg)->sess_get_initiator_sid != NULL) {
+ memset(&buf[0], 0, PR_REG_ISID_LEN);
+ TPG_TFO(se_tpg)->sess_get_initiator_sid(se_sess,
+ &buf[0], PR_REG_ISID_LEN);
+ se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
+ }
+ 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);
+
+ printk(KERN_INFO "TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
+ TPG_TFO(se_tpg)->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)
+{
+ spin_lock_bh(&se_tpg->session_lock);
+ __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
+ spin_unlock_bh(&se_tpg->session_lock);
+}
+EXPORT_SYMBOL(transport_register_session);
+
+void transport_deregister_session_configfs(struct se_session *se_sess)
+{
+ struct se_node_acl *se_nacl;
+
+ /*
+ * 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_irq(&se_nacl->nacl_sess_lock);
+ 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_irq(&se_nacl->nacl_sess_lock);
+ }
+}
+EXPORT_SYMBOL(transport_deregister_session_configfs);
+
+void transport_free_session(struct se_session *se_sess)
+{
+ 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;
+ struct se_node_acl *se_nacl;
+
+ if (!(se_tpg)) {
+ transport_free_session(se_sess);
+ return;
+ }
+ /*
+ * Wait for possible reference in drivers/target/target_core_mib.c:
+ * scsi_att_intr_port_seq_show()
+ */
+ while (atomic_read(&se_sess->mib_ref_count) != 0)
+ cpu_relax();
+
+ spin_lock_bh(&se_tpg->session_lock);
+ list_del(&se_sess->sess_list);
+ se_sess->se_tpg = NULL;
+ se_sess->fabric_sess_ptr = NULL;
+ spin_unlock_bh(&se_tpg->session_lock);
+
+ /*
+ * 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;
+ if ((se_nacl)) {
+ spin_lock_bh(&se_tpg->acl_node_lock);
+ if (se_nacl->dynamic_node_acl) {
+ if (!(TPG_TFO(se_tpg)->tpg_check_demo_mode_cache(
+ se_tpg))) {
+ list_del(&se_nacl->acl_list);
+ se_tpg->num_node_acls--;
+ spin_unlock_bh(&se_tpg->acl_node_lock);
+
+ core_tpg_wait_for_nacl_pr_ref(se_nacl);
+ core_tpg_wait_for_mib_ref(se_nacl);
+ core_free_device_list_for_node(se_nacl, se_tpg);
+ TPG_TFO(se_tpg)->tpg_release_fabric_acl(se_tpg,
+ se_nacl);
+ spin_lock_bh(&se_tpg->acl_node_lock);
+ }
+ }
+ spin_unlock_bh(&se_tpg->acl_node_lock);
+ }
+
+ transport_free_session(se_sess);
+
+ printk(KERN_INFO "TARGET_CORE[%s]: Deregistered fabric_sess\n",
+ TPG_TFO(se_tpg)->get_fabric_name());
+}
+EXPORT_SYMBOL(transport_deregister_session);
+
+/*
+ * Called with T_TASK(cmd)->t_state_lock held.
+ */
+static void transport_all_task_dev_remove_state(struct se_cmd *cmd)
+{
+ struct se_device *dev;
+ struct se_task *task;
+ unsigned long flags;
+
+ if (!T_TASK(cmd))
+ return;
+
+ list_for_each_entry(task, &T_TASK(cmd)->t_task_list, t_list) {
+ dev = task->se_dev;
+ if (!(dev))
+ continue;
+
+ if (atomic_read(&task->task_active))
+ continue;
+
+ if (!(atomic_read(&task->task_state_active)))
+ continue;
+
+ spin_lock_irqsave(&dev->execute_task_lock, flags);
+ list_del(&task->t_state_list);
+ DEBUG_TSTATE("Removed ITT: 0x%08x dev: %p task[%p]\n",
+ CMD_TFO(cmd)->tfo_get_task_tag(cmd), dev, task);
+ spin_unlock_irqrestore(&dev->execute_task_lock, flags);
+
+ atomic_set(&task->task_state_active, 0);
+ atomic_dec(&T_TASK(cmd)->t_task_cdbs_ex_left);
+ }
+}
+
+/* transport_cmd_check_stop():
+ *
+ * 'transport_off = 1' determines if t_transport_active should be cleared.
+ * 'transport_off = 2' determines if task_dev_state should be removed.
+ *
+ * A non-zero u8 t_state sets cmd->t_state.
+ * Returns 1 when command is stopped, else 0.
+ */
+static int transport_cmd_check_stop(
+ struct se_cmd *cmd,
+ int transport_off,
+ u8 t_state)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
+ /*
+ * Determine if IOCTL context caller in requesting the stopping of this
+ * command for LUN shutdown purposes.
+ */
+ if (atomic_read(&T_TASK(cmd)->transport_lun_stop)) {
+ DEBUG_CS("%s:%d atomic_read(&T_TASK(cmd)->transport_lun_stop)"
+ " == TRUE for ITT: 0x%08x\n", __func__, __LINE__,
+ CMD_TFO(cmd)->get_task_tag(cmd));
+
+ cmd->deferred_t_state = cmd->t_state;
+ cmd->t_state = TRANSPORT_DEFERRED_CMD;
+ atomic_set(&T_TASK(cmd)->t_transport_active, 0);
+ if (transport_off == 2)
+ transport_all_task_dev_remove_state(cmd);
+ spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+
+ complete(&T_TASK(cmd)->transport_lun_stop_comp);
+ return 1;
+ }
+ /*
+ * Determine if frontend context caller is requesting the stopping of
+ * this command for frontend excpections.
+ */
+ if (atomic_read(&T_TASK(cmd)->t_transport_stop)) {
+ DEBUG_CS("%s:%d atomic_read(&T_TASK(cmd)->t_transport_stop) =="
+ " TRUE for ITT: 0x%08x\n", __func__, __LINE__,
+ CMD_TFO(cmd)->get_task_tag(cmd));
+
+ cmd->deferred_t_state = cmd->t_state;
+ cmd->t_state = TRANSPORT_DEFERRED_CMD;
+ if (transport_off == 2)
+ transport_all_task_dev_remove_state(cmd);
+
+ /*
+ * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
+ * to FE.
+ */
+ if (transport_off == 2)
+ cmd->se_lun = NULL;
+ spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+
+ complete(&T_TASK(cmd)->t_transport_stop_comp);
+ return 1;
+ }
+ if (transport_off) {
+ atomic_set(&T_TASK(cmd)->t_transport_active, 0);
+ if (transport_off == 2) {
+ transport_all_task_dev_remove_state(cmd);
+ /*
+ * Clear struct se_cmd->se_lun before the transport_off == 2
+ * handoff to fabric module.
+ */
+ cmd->se_lun = NULL;
+ /*
+ * Some fabric modules like tcm_loop can release
+ * their internally allocated I/O refrence now and
+ * struct se_cmd now.
+ */
+ if (CMD_TFO(cmd)->check_stop_free != NULL) {
+ spin_unlock_irqrestore(
+ &T_TASK(cmd)->t_state_lock, flags);
+
+ CMD_TFO(cmd)->check_stop_free(cmd);
+ return 1;
+ }
+ }
+ spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+
+ return 0;
+ } else if (t_state)
+ cmd->t_state = t_state;
+ spin_unlock_irqrestore(&T_TASK(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, 2, 0);
+}
+
+static void transport_lun_remove_cmd(struct se_cmd *cmd)
+{
+ struct se_lun *lun = SE_LUN(cmd);
+ unsigned long flags;
+
+ if (!lun)
+ return;
+
+ spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
+ if (!(atomic_read(&T_TASK(cmd)->transport_dev_active))) {
+ spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+ goto check_lun;
+ }
+ atomic_set(&T_TASK(cmd)->transport_dev_active, 0);
+ transport_all_task_dev_remove_state(cmd);
+ spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+
+ transport_free_dev_tasks(cmd);
+
+check_lun:
+ spin_lock_irqsave(&lun->lun_cmd_lock, flags);
+ if (atomic_read(&T_TASK(cmd)->transport_lun_active)) {
+ list_del(&cmd->se_lun_list);
+ atomic_set(&T_TASK(cmd)->transport_lun_active, 0);
+#if 0
+ printk(KERN_INFO "Removed ITT: 0x%08x from LUN LIST[%d]\n"
+ CMD_TFO(cmd)->get_task_tag(cmd), lun->unpacked_lun);
+#endif
+ }
+ spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
+}
+
+void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
+{
+ transport_remove_cmd_from_queue(cmd, SE_DEV(cmd)->dev_queue_obj);
+ transport_lun_remove_cmd(cmd);
+
+ if (transport_cmd_check_stop_to_fabric(cmd))
+ return;
+ if (remove)
+ transport_generic_remove(cmd, 0, 0);
+}
+
+void transport_cmd_finish_abort_tmr(struct se_cmd *cmd)
+{
+ transport_remove_cmd_from_queue(cmd, SE_DEV(cmd)->dev_queue_obj);
+
+ if (transport_cmd_check_stop_to_fabric(cmd))
+ return;
+
+ transport_generic_remove(cmd, 0, 0);
+}
+
+static int transport_add_cmd_to_queue(
+ struct se_cmd *cmd,
+ int t_state)
+{
+ struct se_device *dev = cmd->se_dev;
+ struct se_queue_obj *qobj = dev->dev_queue_obj;
+ struct se_queue_req *qr;
+ unsigned long flags;
+
+ qr = kzalloc(sizeof(struct se_queue_req), GFP_ATOMIC);
+ if (!(qr)) {
+ printk(KERN_ERR "Unable to allocate memory for"
+ " struct se_queue_req\n");
+ return -1;
+ }
+ INIT_LIST_HEAD(&qr->qr_list);
+
+ qr->cmd = (void *)cmd;
+ qr->state = t_state;
+
+ if (t_state) {
+ spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
+ cmd->t_state = t_state;
+ atomic_set(&T_TASK(cmd)->t_transport_active, 1);
+ spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+ }
+
+ spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
+ list_add_tail(&qr->qr_list, &qobj->qobj_list);
+ atomic_inc(&T_TASK(cmd)->t_transport_queue_active);
+ spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
+
+ atomic_inc(&qobj->queue_cnt);
+ wake_up_interruptible(&qobj->thread_wq);
+ return 0;
+}
+
+/*
+ * Called with struct se_queue_obj->cmd_queue_lock held.
+ */
+static struct se_queue_req *
+__transport_get_qr_from_queue(struct se_queue_obj *qobj)
+{
+ struct se_cmd *cmd;
+ struct se_queue_req *qr = NULL;
+
+ if (list_empty(&qobj->qobj_list))
+ return NULL;
+
+ list_for_each_entry(qr, &qobj->qobj_list, qr_list)
+ break;
+
+ if (qr->cmd) {
+ cmd = (struct se_cmd *)qr->cmd;
+ atomic_dec(&T_TASK(cmd)->t_transport_queue_active);
+ }
+ list_del(&qr->qr_list);
+ atomic_dec(&qobj->queue_cnt);
+
+ return qr;
+}
+
+static struct se_queue_req *
+transport_get_qr_from_queue(struct se_queue_obj *qobj)
+{
+ struct se_cmd *cmd;
+ struct se_queue_req *qr;
+ unsigned long flags;
+
+ spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
+ if (list_empty(&qobj->qobj_list)) {
+ spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
+ return NULL;
+ }
+
+ list_for_each_entry(qr, &qobj->qobj_list, qr_list)
+ break;
+
+ if (qr->cmd) {
+ cmd = (struct se_cmd *)qr->cmd;
+ atomic_dec(&T_TASK(cmd)->t_transport_queue_active);
+ }
+ list_del(&qr->qr_list);
+ atomic_dec(&qobj->queue_cnt);
+ spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
+
+ return qr;
+}
+
+static void transport_remove_cmd_from_queue(struct se_cmd *cmd,
+ struct se_queue_obj *qobj)
+{
+ struct se_cmd *q_cmd;
+ struct se_queue_req *qr = NULL, *qr_p = NULL;
+ unsigned long flags;
+
+ spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
+ if (!(atomic_read(&T_TASK(cmd)->t_transport_queue_active))) {
+ spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
+ return;
+ }
+
+ list_for_each_entry_safe(qr, qr_p, &qobj->qobj_list, qr_list) {
+ q_cmd = (struct se_cmd *)qr->cmd;
+ if (q_cmd != cmd)
+ continue;
+
+ atomic_dec(&T_TASK(q_cmd)->t_transport_queue_active);
+ atomic_dec(&qobj->queue_cnt);
+ list_del(&qr->qr_list);
+ kfree(qr);
+ }
+ spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
+
+ if (atomic_read(&T_TASK(cmd)->t_transport_queue_active)) {
+ printk(KERN_ERR "ITT: 0x%08x t_transport_queue_active: %d\n",
+ CMD_TFO(cmd)->get_task_tag(cmd),
+ atomic_read(&T_TASK(cmd)->t_transport_queue_active));
+ }
+}
+
+/*
+ * Completion function used by TCM subsystem plugins (such as FILEIO)
+ * for queueing up response from struct se_subsystem_api->do_task()
+ */
+void transport_complete_sync_cache(struct se_cmd *cmd, int good)
+{
+ struct se_task *task = list_entry(T_TASK(cmd)->t_task_list.next,
+ struct se_task, t_list);
+
+ if (good) {
+ cmd->scsi_status = SAM_STAT_GOOD;
+ task->task_scsi_status = GOOD;
+ } else {
+ task->task_scsi_status = SAM_STAT_CHECK_CONDITION;
+ task->task_error_status = PYX_TRANSPORT_ILLEGAL_REQUEST;
+ TASK_CMD(task)->transport_error_status =
+ PYX_TRANSPORT_ILLEGAL_REQUEST;
+ }
+
+ transport_complete_task(task, good);
+}
+EXPORT_SYMBOL(transport_complete_sync_cache);
+
+/* transport_complete_task():
+ *
+ * Called from interrupt and non interrupt context depending
+ * on the transport plugin.
+ */
+void transport_complete_task(struct se_task *task, int success)
+{
+ struct se_cmd *cmd = TASK_CMD(task);
+ struct se_device *dev = task->se_dev;
+ int t_state;
+ unsigned long flags;
+#if 0
+ printk(KERN_INFO "task: %p CDB: 0x%02x obj_ptr: %p\n", task,
+ T_TASK(cmd)->t_task_cdb[0], dev);
+#endif
+ if (dev) {
+ spin_lock_irqsave(&SE_HBA(dev)->hba_queue_lock, flags);
+ atomic_inc(&dev->depth_left);
+ atomic_inc(&SE_HBA(dev)->left_queue_depth);
+ spin_unlock_irqrestore(&SE_HBA(dev)->hba_queue_lock, flags);
+ }
+
+ spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
+ atomic_set(&task->task_active, 0);
+
+ /*
+ * See if any sense data exists, if so set the TASK_SENSE flag.
+ * Also check for any other post completion work that needs to be
+ * done by the plugins.
+ */
+ if (dev && dev->transport->transport_complete) {
+ if (dev->transport->transport_complete(task) != 0) {
+ cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
+ task->task_sense = 1;
+ success = 1;
+ }
+ }
+
+ /*
+ * See if we are waiting for outstanding struct se_task
+ * to complete for an exception condition
+ */
+ if (atomic_read(&task->task_stop)) {
+ /*
+ * Decrement T_TASK(cmd)->t_se_count if this task had
+ * previously thrown its timeout exception handler.
+ */
+ if (atomic_read(&task->task_timeout)) {
+ atomic_dec(&T_TASK(cmd)->t_se_count);
+ atomic_set(&task->task_timeout, 0);
+ }
+ spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+
+ complete(&task->task_stop_comp);
+ return;
+ }
+ /*
+ * If the task's timeout handler has fired, use the t_task_cdbs_timeout
+ * left counter to determine when the struct se_cmd is ready to be queued to
+ * the processing thread.
+ */
+ if (atomic_read(&task->task_timeout)) {
+ if (!(atomic_dec_and_test(
+ &T_TASK(cmd)->t_task_cdbs_timeout_left))) {
+ spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock,
+ flags);
+ return;
+ }
+ t_state = TRANSPORT_COMPLETE_TIMEOUT;
+ spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+
+ transport_add_cmd_to_queue(cmd, t_state);
+ return;
+ }
+ atomic_dec(&T_TASK(cmd)->t_task_cdbs_timeout_left);
+
+ /*
+ * Decrement the outstanding t_task_cdbs_left count. The last
+ * struct se_task from struct se_cmd will complete itself into the
+ * device queue depending upon int success.
+ */
+ if (!(atomic_dec_and_test(&T_TASK(cmd)->t_task_cdbs_left))) {
+ if (!success)
+ T_TASK(cmd)->t_tasks_failed = 1;
+
+ spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+ return;
+ }
+
+ if (!success || T_TASK(cmd)->t_tasks_failed) {
+ t_state = TRANSPORT_COMPLETE_FAILURE;
+ if (!task->task_error_status) {
+ task->task_error_status =
+ PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
+ cmd->transport_error_status =
+ PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
+ }
+ } else {
+ atomic_set(&T_TASK(cmd)->t_transport_complete, 1);
+ t_state = TRANSPORT_COMPLETE_OK;
+ }
+ spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+
+ transport_add_cmd_to_queue(cmd, t_state);
+}
+EXPORT_SYMBOL(transport_complete_task);
+
+/*
+ * Called by transport_add_tasks_from_cmd() once a struct se_cmd's
+ * struct se_task list are ready to be added to the active execution list
+ * struct se_device
+
+ * Called with se_dev_t->execute_task_lock called.
+ */
+static inline int transport_add_task_check_sam_attr(
+ struct se_task *task,
+ struct se_task *task_prev,
+ struct se_device *dev)
+{
+ /*
+ * No SAM Task attribute emulation enabled, add to tail of
+ * execution queue
+ */
+ if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) {
+ list_add_tail(&task->t_execute_list, &dev->execute_task_list);
+ return 0;
+ }
+ /*
+ * HEAD_OF_QUEUE attribute for received CDB, which means
+ * the first task that is associated with a struct se_cmd goes to
+ * head of the struct se_device->execute_task_list, and task_prev
+ * after that for each subsequent task
+ */
+ if (task->task_se_cmd->sam_task_attr == TASK_ATTR_HOQ) {
+ list_add(&task->t_execute_list,
+ (task_prev != NULL) ?
+ &task_prev->t_execute_list :
+ &dev->execute_task_list);
+
+ DEBUG_STA("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
+ " in execution queue\n",
+ T_TASK(task->task_se_cmd)->t_task_cdb[0]);
+ return 1;
+ }
+ /*
+ * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
+ * transitioned from Dermant -> Active state, and are added to the end
+ * of the struct se_device->execute_task_list
+ */
+ list_add_tail(&task->t_execute_list, &dev->execute_task_list);
+ return 0;
+}
+
+/* __transport_add_task_to_execute_queue():
+ *
+ * Called with se_dev_t->execute_task_lock called.
+ */
+static void __transport_add_task_to_execute_queue(
+ struct se_task *task,
+ struct se_task *task_prev,
+ struct se_device *dev)
+{
+ int head_of_queue;
+
+ head_of_queue = transport_add_task_check_sam_attr(task, task_prev, dev);
+ atomic_inc(&dev->execute_tasks);
+
+ if (atomic_read(&task->task_state_active))
+ return;
+ /*
+ * Determine if this task needs to go to HEAD_OF_QUEUE for the
+ * state list as well. Running with SAM Task Attribute emulation
+ * will always return head_of_queue == 0 here
+ */
+ if (head_of_queue)
+ list_add(&task->t_state_list, (task_prev) ?
+ &task_prev->t_state_list :
+ &dev->state_task_list);
+ else
+ list_add_tail(&task->t_state_list, &dev->state_task_list);
+
+ atomic_set(&task->task_state_active, 1);
+
+ DEBUG_TSTATE("Added ITT: 0x%08x task[%p] to dev: %p\n",
+ CMD_TFO(task->task_se_cmd)->get_task_tag(task->task_se_cmd),
+ task, dev);
+}
+
+static void transport_add_tasks_to_state_queue(struct se_cmd *cmd)
+{
+ struct se_device *dev;
+ struct se_task *task;
+ unsigned long flags;
+
+ spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
+ list_for_each_entry(task, &T_TASK(cmd)->t_task_list, t_list) {
+ dev = task->se_dev;
+
+ if (atomic_read(&task->task_state_active))
+ continue;
+
+ spin_lock(&dev->execute_task_lock);
+ list_add_tail(&task->t_state_list, &dev->state_task_list);
+ atomic_set(&task->task_state_active, 1);
+
+ DEBUG_TSTATE("Added ITT: 0x%08x task[%p] to dev: %p\n",
+ CMD_TFO(task->task_se_cmd)->get_task_tag(
+ task->task_se_cmd), task, dev);
+
+ spin_unlock(&dev->execute_task_lock);
+ }
+ spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+}
+
+static void transport_add_tasks_from_cmd(struct se_cmd *cmd)
+{
+ struct se_device *dev = SE_DEV(cmd);
+ struct se_task *task, *task_prev = NULL;
+ unsigned long flags;
+
+ spin_lock_irqsave(&dev->execute_task_lock, flags);
+ list_for_each_entry(task, &T_TASK(cmd)->t_task_list, t_list) {
+ if (atomic_read(&task->task_execute_queue))
+ continue;
+ /*
+ * __transport_add_task_to_execute_queue() handles the
+ * SAM Task Attribute emulation if enabled
+ */
+ __transport_add_task_to_execute_queue(task, task_prev, dev);
+ atomic_set(&task->task_execute_queue, 1);
+ task_prev = task;
+ }
+ spin_unlock_irqrestore(&dev->execute_task_lock, flags);
+
+ return;
+}
+
+/* transport_get_task_from_execute_queue():
+ *
+ * Called with dev->execute_task_lock held.
+ */
+static struct se_task *
+transport_get_task_from_execute_queue(struct se_device *dev)
+{
+ struct se_task *task;
+
+ if (list_empty(&dev->execute_task_list))
+ return NULL;
+
+ list_for_each_entry(task, &dev->execute_task_list, t_execute_list)
+ break;
+
+ list_del(&task->t_execute_list);
+ atomic_dec(&dev->execute_tasks);
+
+ return task;
+}
+
+/* transport_remove_task_from_execute_queue():
+ *
+ *
+ */
+static void transport_remove_task_from_execute_queue(
+ struct se_task *task,
+ struct se_device *dev)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&dev->execute_task_lock, flags);
+ list_del(&task->t_execute_list);
+ atomic_dec(&dev->execute_tasks);
+ spin_unlock_irqrestore(&dev->execute_task_lock, flags);
+}
+
+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: ");
+ switch (dev->dev_status) {
+ case TRANSPORT_DEVICE_ACTIVATED:
+ *bl += sprintf(b + *bl, "ACTIVATED");
+ break;
+ case TRANSPORT_DEVICE_DEACTIVATED:
+ *bl += sprintf(b + *bl, "DEACTIVATED");
+ break;
+ case TRANSPORT_DEVICE_SHUTDOWN:
+ *bl += sprintf(b + *bl, "SHUTDOWN");
+ break;
+ case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
+ case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
+ *bl += sprintf(b + *bl, "OFFLINE");
+ break;
+ default:
+ *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
+ break;
+ }
+
+ *bl += sprintf(b + *bl, " Execute/Left/Max Queue Depth: %d/%d/%d",
+ atomic_read(&dev->execute_tasks), atomic_read(&dev->depth_left),
+ dev->queue_depth);
+ *bl += sprintf(b + *bl, " SectorSize: %u MaxSectors: %u\n",
+ DEV_ATTRIB(dev)->block_size, DEV_ATTRIB(dev)->max_sectors);
+ *bl += sprintf(b + *bl, " ");
+}
+
+/* transport_release_all_cmds():
+ *
+ *
+ */
+static void transport_release_all_cmds(struct se_device *dev)
+{
+ struct se_cmd *cmd = NULL;
+ struct se_queue_req *qr = NULL, *qr_p = NULL;
+ int bug_out = 0, t_state;
+ unsigned long flags;
+
+ spin_lock_irqsave(&dev->dev_queue_obj->cmd_queue_lock, flags);
+ list_for_each_entry_safe(qr, qr_p, &dev->dev_queue_obj->qobj_list,
+ qr_list) {
+
+ cmd = (struct se_cmd *)qr->cmd;
+ t_state = qr->state;
+ list_del(&qr->qr_list);
+ kfree(qr);
+ spin_unlock_irqrestore(&dev->dev_queue_obj->cmd_queue_lock,
+ flags);
+
+ printk(KERN_ERR "Releasing ITT: 0x%08x, i_state: %u,"
+ " t_state: %u directly\n",
+ CMD_TFO(cmd)->get_task_tag(cmd),
+ CMD_TFO(cmd)->get_cmd_state(cmd), t_state);
+
+ transport_release_fe_cmd(cmd);
+ bug_out = 1;
+
+ spin_lock_irqsave(&dev->dev_queue_obj->cmd_queue_lock, flags);
+ }
+ spin_unlock_irqrestore(&dev->dev_queue_obj->cmd_queue_lock, flags);
+#if 0
+ if (bug_out)
+ BUG();
+#endif
+}
+
+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
+ printk(KERN_INFO "%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, 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 = -1;
+ break;
+ }
+
+ if (p_buf)
+ strncpy(p_buf, buf, p_buf_len);
+ else
+ printk("%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, 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 = -1;
+ break;
+ }
+
+ if (p_buf)
+ strncpy(p_buf, buf, p_buf_len);
+ else
+ printk("%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 */
+ sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
+ &vpd->device_identifier[0]);
+ break;
+ case 0x02: /* ASCII */
+ sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
+ &vpd->device_identifier[0]);
+ break;
+ case 0x03: /* UTF-8 */
+ sprintf(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 = -1;
+ break;
+ }
+
+ if (p_buf)
+ strncpy(p_buf, buf, p_buf_len);
+ else
+ printk("%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 identifer */
+
+ /*
+ * 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);
+
+static void core_setup_task_attr_emulation(struct se_device *dev)
+{
+ /*
+ * If this device is from Target_Core_Mod/pSCSI, disable the
+ * SAM Task Attribute emulation.
+ *
+ * This is currently not available in upsream Linux/SCSI Target
+ * mode code, and is assumed to be disabled while using TCM/pSCSI.
+ */
+ if (TRANSPORT(dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
+ dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
+ return;
+ }
+
+ dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
+ DEBUG_STA("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
+ " device\n", TRANSPORT(dev)->name,
+ TRANSPORT(dev)->get_device_rev(dev));
+}
+
+static void scsi_dump_inquiry(struct se_device *dev)
+{
+ struct t10_wwn *wwn = DEV_T10_WWN(dev);
+ int i, device_type;
+ /*
+ * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
+ */
+ printk(" Vendor: ");
+ for (i = 0; i < 8; i++)
+ if (wwn->vendor[i] >= 0x20)
+ printk("%c", wwn->vendor[i]);
+ else
+ printk(" ");
+
+ printk(" Model: ");
+ for (i = 0; i < 16; i++)
+ if (wwn->model[i] >= 0x20)
+ printk("%c", wwn->model[i]);
+ else
+ printk(" ");
+
+ printk(" Revision: ");
+ for (i = 0; i < 4; i++)
+ if (wwn->revision[i] >= 0x20)
+ printk("%c", wwn->revision[i]);
+ else
+ printk(" ");
+
+ printk("\n");
+
+ device_type = TRANSPORT(dev)->get_device_type(dev);
+ printk(" Type: %s ", scsi_device_type(device_type));
+ printk(" ANSI SCSI revision: %02x\n",
+ TRANSPORT(dev)->get_device_rev(dev));
+}
+
+struct se_device *transport_add_device_to_core_hba(
+ struct se_hba *hba,
+ struct se_subsystem_api *transport,
+ struct se_subsystem_dev *se_dev,
+ u32 device_flags,
+ void *transport_dev,
+ struct se_dev_limits *dev_limits,
+ const char *inquiry_prod,
+ const char *inquiry_rev)
+{
+ int ret = 0, force_pt;
+ struct se_device *dev;
+
+ dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
+ if (!(dev)) {
+ printk(KERN_ERR "Unable to allocate memory for se_dev_t\n");
+ return NULL;
+ }
+ dev->dev_queue_obj = kzalloc(sizeof(struct se_queue_obj), GFP_KERNEL);
+ if (!(dev->dev_queue_obj)) {
+ printk(KERN_ERR "Unable to allocate memory for"
+ " dev->dev_queue_obj\n");
+ kfree(dev);
+ return NULL;
+ }
+ transport_init_queue_obj(dev->dev_queue_obj);
+
+ dev->dev_status_queue_obj = kzalloc(sizeof(struct se_queue_obj),
+ GFP_KERNEL);
+ if (!(dev->dev_status_queue_obj)) {
+ printk(KERN_ERR "Unable to allocate memory for"
+ " dev->dev_status_queue_obj\n");
+ kfree(dev->dev_queue_obj);
+ kfree(dev);
+ return NULL;
+ }
+ transport_init_queue_obj(dev->dev_status_queue_obj);
+
+ dev->dev_flags = device_flags;
+ dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
+ dev->dev_ptr = (void *) transport_dev;
+ dev->se_hba = hba;
+ dev->se_sub_dev = se_dev;
+ dev->transport = transport;
+ atomic_set(&dev->active_cmds, 0);
+ INIT_LIST_HEAD(&dev->dev_list);
+ INIT_LIST_HEAD(&dev->dev_sep_list);
+ INIT_LIST_HEAD(&dev->dev_tmr_list);
+ INIT_LIST_HEAD(&dev->execute_task_list);
+ INIT_LIST_HEAD(&dev->delayed_cmd_list);
+ INIT_LIST_HEAD(&dev->ordered_cmd_list);
+ INIT_LIST_HEAD(&dev->state_task_list);
+ spin_lock_init(&dev->execute_task_lock);
+ spin_lock_init(&dev->delayed_cmd_lock);
+ spin_lock_init(&dev->ordered_cmd_lock);
+ spin_lock_init(&dev->state_task_lock);
+ spin_lock_init(&dev->dev_alua_lock);
+ spin_lock_init(&dev->dev_reservation_lock);
+ spin_lock_init(&dev->dev_status_lock);
+ spin_lock_init(&dev->dev_status_thr_lock);
+ spin_lock_init(&dev->se_port_lock);
+ spin_lock_init(&dev->se_tmr_lock);
+
+ dev->queue_depth = dev_limits->queue_depth;
+ atomic_set(&dev->depth_left, dev->queue_depth);
+ atomic_set(&dev->dev_ordered_id, 0);
+
+ se_dev_set_default_attribs(dev, dev_limits);
+
+ dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
+ dev->creation_time = get_jiffies_64();
+ spin_lock_init(&dev->stats_lock);
+
+ spin_lock(&hba->device_lock);
+ list_add_tail(&dev->dev_list, &hba->hba_dev_list);
+ hba->dev_count++;
+ spin_unlock(&hba->device_lock);
+ /*
+ * Setup the SAM Task Attribute emulation for struct se_device
+ */
+ core_setup_task_attr_emulation(dev);
+ /*
+ * Force PR and ALUA passthrough emulation with internal object use.
+ */
+ force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
+ /*
+ * Setup the Reservations infrastructure for struct se_device
+ */
+ core_setup_reservations(dev, force_pt);
+ /*
+ * Setup the Asymmetric Logical Unit Assignment for struct se_device
+ */
+ if (core_setup_alua(dev, force_pt) < 0)
+ goto out;
+
+ /*
+ * Startup the struct se_device processing thread
+ */
+ dev->process_thread = kthread_run(transport_processing_thread, dev,
+ "LIO_%s", TRANSPORT(dev)->name);
+ if (IS_ERR(dev->process_thread)) {
+ printk(KERN_ERR "Unable to create kthread: LIO_%s\n",
+ TRANSPORT(dev)->name);
+ goto out;
+ }
+
+ /*
+ * Preload the initial INQUIRY const values if we are doing
+ * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
+ * passthrough because this is being provided by the backend LLD.
+ * This is required so that transport_get_inquiry() copies these
+ * originals once back into DEV_T10_WWN(dev) for the virtual device
+ * setup.
+ */
+ if (TRANSPORT(dev)->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
+ if (!(inquiry_prod) || !(inquiry_prod)) {
+ printk(KERN_ERR "All non TCM/pSCSI plugins require"
+ " INQUIRY consts\n");
+ goto out;
+ }
+
+ strncpy(&DEV_T10_WWN(dev)->vendor[0], "LIO-ORG", 8);
+ strncpy(&DEV_T10_WWN(dev)->model[0], inquiry_prod, 16);
+ strncpy(&DEV_T10_WWN(dev)->revision[0], inquiry_rev, 4);
+ }
+ scsi_dump_inquiry(dev);
+
+out:
+ if (!ret)
+ return dev;
+ kthread_stop(dev->process_thread);
+
+ spin_lock(&hba->device_lock);
+ list_del(&dev->dev_list);
+ hba->dev_count--;
+ spin_unlock(&hba->device_lock);
+
+ se_release_vpd_for_dev(dev);
+
+ kfree(dev->dev_status_queue_obj);
+ kfree(dev->dev_queue_obj);
+ kfree(dev);
+
+ return NULL;
+}
+EXPORT_SYMBOL(transport_add_device_to_core_hba);
+
+/* transport_generic_prepare_cdb():
+ *
+ * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will
+ * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
+ * The point of this is since we are mapping iSCSI LUNs to
+ * SCSI Target IDs having a non-zero LUN in the CDB will throw the
+ * devices and HBAs for a loop.
+ */
+static inline void transport_generic_prepare_cdb(
+ unsigned char *cdb)
+{
+ switch (cdb[0]) {
+ case READ_10: /* SBC - RDProtect */
+ case READ_12: /* SBC - RDProtect */
+ case READ_16: /* SBC - RDProtect */
+ case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
+ case VERIFY: /* SBC - VRProtect */
+ case VERIFY_16: /* SBC - VRProtect */
+ case WRITE_VERIFY: /* SBC - VRProtect */
+ case WRITE_VERIFY_12: /* SBC - VRProtect */
+ break;
+ default:
+ cdb[1] &= 0x1f; /* clear logical unit number */
+ break;
+ }
+}
+
+static struct se_task *
+transport_generic_get_task(struct se_cmd *cmd,
+ enum dma_data_direction data_direction)
+{
+ struct se_task *task;
+ struct se_device *dev = SE_DEV(cmd);
+ unsigned long flags;
+
+ task = dev->transport->alloc_task(cmd);
+ if (!task) {
+ printk(KERN_ERR "Unable to allocate struct se_task\n");
+ return NULL;
+ }
+
+ INIT_LIST_HEAD(&task->t_list);
+ INIT_LIST_HEAD(&task->t_execute_list);
+ INIT_LIST_HEAD(&task->t_state_list);
+ init_completion(&task->task_stop_comp);
+ task->task_no = T_TASK(cmd)->t_tasks_no++;
+ task->task_se_cmd = cmd;
+ task->se_dev = dev;
+ task->task_data_direction = data_direction;
+
+ spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
+ list_add_tail(&task->t_list, &T_TASK(cmd)->t_task_list);
+ spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+
+ return task;
+}
+
+static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *);
+
+void transport_device_setup_cmd(struct se_cmd *cmd)
+{
+ cmd->se_dev = SE_LUN(cmd)->lun_se_dev;
+}
+EXPORT_SYMBOL(transport_device_setup_cmd);
+
+/*
+ * 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,
+ 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_lun_list);
+ INIT_LIST_HEAD(&cmd->se_delayed_list);
+ INIT_LIST_HEAD(&cmd->se_ordered_list);
+ /*
+ * Setup t_task pointer to t_task_backstore
+ */
+ cmd->t_task = &cmd->t_task_backstore;
+
+ INIT_LIST_HEAD(&T_TASK(cmd)->t_task_list);
+ init_completion(&T_TASK(cmd)->transport_lun_fe_stop_comp);
+ init_completion(&T_TASK(cmd)->transport_lun_stop_comp);
+ init_completion(&T_TASK(cmd)->t_transport_stop_comp);
+ spin_lock_init(&T_TASK(cmd)->t_state_lock);
+ atomic_set(&T_TASK(cmd)->transport_dev_active, 1);
+
+ 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;
+}
+EXPORT_SYMBOL(transport_init_se_cmd);
+
+static int transport_check_alloc_task_attr(struct se_cmd *cmd)
+{
+ /*
+ * Check if SAM Task Attribute emulation is enabled for this
+ * struct se_device storage object
+ */
+ if (SE_DEV(cmd)->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
+ return 0;
+
+ if (cmd->sam_task_attr == TASK_ATTR_ACA) {
+ DEBUG_STA("SAM Task Attribute ACA"
+ " emulation is not supported\n");
+ return -1;
+ }
+ /*
+ * Used to determine when ORDERED commands should go from
+ * Dormant to Active status.
+ */
+ cmd->se_ordered_id = atomic_inc_return(&SE_DEV(cmd)->dev_ordered_id);
+ smp_mb__after_atomic_inc();
+ DEBUG_STA("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
+ cmd->se_ordered_id, cmd->sam_task_attr,
+ TRANSPORT(cmd->se_dev)->name);
+ return 0;
+}
+
+void transport_free_se_cmd(
+ struct se_cmd *se_cmd)
+{
+ if (se_cmd->se_tmr_req)
+ core_tmr_release_req(se_cmd->se_tmr_req);
+ /*
+ * Check and free any extended CDB buffer that was allocated
+ */
+ if (T_TASK(se_cmd)->t_task_cdb != T_TASK(se_cmd)->__t_task_cdb)
+ kfree(T_TASK(se_cmd)->t_task_cdb);
+}
+EXPORT_SYMBOL(transport_free_se_cmd);
+
+static void transport_generic_wait_for_tasks(struct se_cmd *, int, int);
+
+/* transport_generic_allocate_tasks():
+ *
+ * Called from fabric RX Thread.
+ */
+int transport_generic_allocate_tasks(
+ struct se_cmd *cmd,
+ unsigned char *cdb)
+{
+ int ret;
+
+ transport_generic_prepare_cdb(cdb);
+
+ /*
+ * This is needed for early exceptions.
+ */
+ cmd->transport_wait_for_tasks = &transport_generic_wait_for_tasks;
+
+ transport_device_setup_cmd(cmd);
+ /*
+ * 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) {
+ printk(KERN_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 -1;
+ }
+ /*
+ * 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(T_TASK(cmd)->__t_task_cdb)) {
+ T_TASK(cmd)->t_task_cdb = kzalloc(scsi_command_size(cdb),
+ GFP_KERNEL);
+ if (!(T_TASK(cmd)->t_task_cdb)) {
+ printk(KERN_ERR "Unable to allocate T_TASK(cmd)->t_task_cdb"
+ " %u > sizeof(T_TASK(cmd)->__t_task_cdb): %lu ops\n",
+ scsi_command_size(cdb),
+ (unsigned long)sizeof(T_TASK(cmd)->__t_task_cdb));
+ return -1;
+ }
+ } else
+ T_TASK(cmd)->t_task_cdb = &T_TASK(cmd)->__t_task_cdb[0];
+ /*
+ * Copy the original CDB into T_TASK(cmd).
+ */
+ memcpy(T_TASK(cmd)->t_task_cdb, cdb, scsi_command_size(cdb));
+ /*
+ * Setup the received CDB based on SCSI defined opcodes and
+ * perform unit attention, persistent reservations and ALUA
+ * checks for virtual device backends. The T_TASK(cmd)->t_task_cdb
+ * pointer is expected to be setup before we reach this point.
+ */
+ ret = transport_generic_cmd_sequencer(cmd, cdb);
+ if (ret < 0)
+ return ret;
+ /*
+ * Check for SAM Task Attribute Emulation
+ */
+ if (transport_check_alloc_task_attr(cmd) < 0) {
+ cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
+ cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
+ return -2;
+ }
+ 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(transport_generic_allocate_tasks);
+
+/*
+ * Used by fabric module frontends not defining a TFO->new_cmd_map()
+ * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD statis
+ */
+int transport_generic_handle_cdb(
+ struct se_cmd *cmd)
+{
+ if (!SE_LUN(cmd)) {
+ dump_stack();
+ printk(KERN_ERR "SE_LUN(cmd) is NULL\n");
+ return -1;
+ }
+
+ transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD);
+ return 0;
+}
+EXPORT_SYMBOL(transport_generic_handle_cdb);
+
+/*
+ * Used by fabric module frontends defining a TFO->new_cmd_map() caller
+ * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
+ * complete setup in TCM process context w/ TFO->new_cmd_map().
+ */
+int transport_generic_handle_cdb_map(
+ struct se_cmd *cmd)
+{
+ if (!SE_LUN(cmd)) {
+ dump_stack();
+ printk(KERN_ERR "SE_LUN(cmd) is NULL\n");
+ return -1;
+ }
+
+ transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP);
+ return 0;
+}
+EXPORT_SYMBOL(transport_generic_handle_cdb_map);
+
+/* transport_generic_handle_data():
+ *
+ *
+ */
+int transport_generic_handle_data(
+ struct se_cmd *cmd)
+{
+ /*
+ * For the software fabric case, then we assume the nexus is being
+ * failed/shutdown when signals are pending from the kthread context
+ * caller, so we return a failure. For the HW target mode case running
+ * in interrupt code, the signal_pending() check is skipped.
+ */
+ if (!in_interrupt() && signal_pending(current))
+ return -1;
+ /*
+ * If the received CDB has aleady been ABORTED by the generic
+ * target engine, we now call transport_check_aborted_status()
+ * to queue any delated TASK_ABORTED status for the received CDB to the
+ * fabric module as we are expecting no futher incoming DATA OUT
+ * sequences at this point.
+ */
+ if (transport_check_aborted_status(cmd, 1) != 0)
+ return 0;
+
+ transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE);
+ return 0;
+}
+EXPORT_SYMBOL(transport_generic_handle_data);
+
+/* transport_generic_handle_tmr():
+ *
+ *
+ */
+int transport_generic_handle_tmr(
+ struct se_cmd *cmd)
+{
+ /*
+ * This is needed for early exceptions.
+ */
+ cmd->transport_wait_for_tasks = &transport_generic_wait_for_tasks;
+ transport_device_setup_cmd(cmd);
+
+ transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR);
+ return 0;
+}
+EXPORT_SYMBOL(transport_generic_handle_tmr);
+
+static int transport_stop_tasks_for_cmd(struct se_cmd *cmd)
+{
+ struct se_task *task, *task_tmp;
+ unsigned long flags;
+ int ret = 0;
+
+ DEBUG_TS("ITT[0x%08x] - Stopping tasks\n",
+ CMD_TFO(cmd)->get_task_tag(cmd));
+
+ /*
+ * No tasks remain in the execution queue
+ */
+ spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
+ list_for_each_entry_safe(task, task_tmp,
+ &T_TASK(cmd)->t_task_list, t_list) {
+ DEBUG_TS("task_no[%d] - Processing task %p\n",
+ task->task_no, task);
+ /*
+ * If the struct se_task has not been sent and is not active,
+ * remove the struct se_task from the execution queue.
+ */
+ if (!atomic_read(&task->task_sent) &&
+ !atomic_read(&task->task_active)) {
+ spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock,
+ flags);
+ transport_remove_task_from_execute_queue(task,
+ task->se_dev);
+
+ DEBUG_TS("task_no[%d] - Removed from execute queue\n",
+ task->task_no);
+ spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
+ continue;
+ }
+
+ /*
+ * If the struct se_task is active, sleep until it is returned
+ * from the plugin.
+ */
+ if (atomic_read(&task->task_active)) {
+ atomic_set(&task->task_stop, 1);
+ spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock,
+ flags);
+
+ DEBUG_TS("task_no[%d] - Waiting to complete\n",
+ task->task_no);
+ wait_for_completion(&task->task_stop_comp);
+ DEBUG_TS("task_no[%d] - Stopped successfully\n",
+ task->task_no);
+
+ spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
+ atomic_dec(&T_TASK(cmd)->t_task_cdbs_left);
+
+ atomic_set(&task->task_active, 0);
+ atomic_set(&task->task_stop, 0);
+ } else {
+ DEBUG_TS("task_no[%d] - Did nothing\n", task->task_no);
+ ret++;
+ }
+
+ __transport_stop_task_timer(task, &flags);
+ }
+ spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+
+ return ret;
+}
+
+static void transport_failure_reset_queue_depth(struct se_device *dev)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&SE_HBA(dev)->hba_queue_lock, flags);;
+ atomic_inc(&dev->depth_left);
+ atomic_inc(&SE_HBA(dev)->left_queue_depth);
+ spin_unlock_irqrestore(&SE_HBA(dev)->hba_queue_lock, flags);
+}
+
+/*
+ * Handle SAM-esque emulation for generic transport request failures.
+ */
+static void transport_generic_request_failure(
+ struct se_cmd *cmd,
+ struct se_device *dev,
+ int complete,
+ int sc)
+{
+ DEBUG_GRF("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
+ " CDB: 0x%02x\n", cmd, CMD_TFO(cmd)->get_task_tag(cmd),
+ T_TASK(cmd)->t_task_cdb[0]);
+ DEBUG_GRF("-----[ i_state: %d t_state/def_t_state:"
+ " %d/%d transport_error_status: %d\n",
+ CMD_TFO(cmd)->get_cmd_state(cmd),
+ cmd->t_state, cmd->deferred_t_state,
+ cmd->transport_error_status);
+ DEBUG_GRF("-----[ t_task_cdbs: %d t_task_cdbs_left: %d"
+ " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
+ " t_transport_active: %d t_transport_stop: %d"
+ " t_transport_sent: %d\n", T_TASK(cmd)->t_task_cdbs,
+ atomic_read(&T_TASK(cmd)->t_task_cdbs_left),
+ atomic_read(&T_TASK(cmd)->t_task_cdbs_sent),
+ atomic_read(&T_TASK(cmd)->t_task_cdbs_ex_left),
+ atomic_read(&T_TASK(cmd)->t_transport_active),
+ atomic_read(&T_TASK(cmd)->t_transport_stop),
+ atomic_read(&T_TASK(cmd)->t_transport_sent));
+
+ transport_stop_all_task_timers(cmd);
+
+ if (dev)
+ transport_failure_reset_queue_depth(dev);
+ /*
+ * For SAM Task Attribute emulation for failed struct se_cmd
+ */
+ if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
+ transport_complete_task_attr(cmd);
+
+ if (complete) {
+ transport_direct_request_timeout(cmd);
+ cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE;
+ }
+
+ switch (cmd->transport_error_status) {
+ case PYX_TRANSPORT_UNKNOWN_SAM_OPCODE:
+ cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
+ break;
+ case PYX_TRANSPORT_REQ_TOO_MANY_SECTORS:
+ cmd->scsi_sense_reason = TCM_SECTOR_COUNT_TOO_MANY;
+ break;
+ case PYX_TRANSPORT_INVALID_CDB_FIELD:
+ cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
+ break;
+ case PYX_TRANSPORT_INVALID_PARAMETER_LIST:
+ cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
+ break;
+ case PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES:
+ if (!sc)
+ transport_new_cmd_failure(cmd);
+ /*
+ * Currently for PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES,
+ * we force this session to fall back to session
+ * recovery.
+ */
+ CMD_TFO(cmd)->fall_back_to_erl0(cmd->se_sess);
+ CMD_TFO(cmd)->stop_session(cmd->se_sess, 0, 0);
+
+ goto check_stop;
+ case PYX_TRANSPORT_LU_COMM_FAILURE:
+ case PYX_TRANSPORT_ILLEGAL_REQUEST:
+ cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
+ break;
+ case PYX_TRANSPORT_UNKNOWN_MODE_PAGE:
+ cmd->scsi_sense_reason = TCM_UNKNOWN_MODE_PAGE;
+ break;
+ case PYX_TRANSPORT_WRITE_PROTECTED:
+ cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
+ break;
+ case PYX_TRANSPORT_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 (SE_SESS(cmd) &&
+ DEV_ATTRIB(cmd->se_dev)->emulate_ua_intlck_ctrl == 2)
+ core_scsi3_ua_allocate(SE_SESS(cmd)->se_node_acl,
+ cmd->orig_fe_lun, 0x2C,
+ ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
+
+ CMD_TFO(cmd)->queue_status(cmd);
+ goto check_stop;
+ case PYX_TRANSPORT_USE_SENSE_REASON:
+ /*
+ * struct se_cmd->scsi_sense_reason already set
+ */
+ break;
+ default:
+ printk(KERN_ERR "Unknown transport error for CDB 0x%02x: %d\n",
+ T_TASK(cmd)->t_task_cdb[0],
+ cmd->transport_error_status);
+ cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
+ break;
+ }
+
+ if (!sc)
+ transport_new_cmd_failure(cmd);
+ else
+ transport_send_check_condition_and_sense(cmd,
+ cmd->scsi_sense_reason, 0);
+check_stop:
+ transport_lun_remove_cmd(cmd);
+ if (!(transport_cmd_check_stop_to_fabric(cmd)))
+ ;
+}
+
+static void transport_direct_request_timeout(struct se_cmd *cmd)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
+ if (!(atomic_read(&T_TASK(cmd)->t_transport_timeout))) {
+ spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+ return;
+ }
+ if (atomic_read(&T_TASK(cmd)->t_task_cdbs_timeout_left)) {
+ spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+ return;
+ }
+
+ atomic_sub(atomic_read(&T_TASK(cmd)->t_transport_timeout),
+ &T_TASK(cmd)->t_se_count);
+ spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+}
+
+static void transport_generic_request_timeout(struct se_cmd *cmd)
+{
+ unsigned long flags;
+
+ /*
+ * Reset T_TASK(cmd)->t_se_count to allow transport_generic_remove()
+ * to allow last call to free memory resources.
+ */
+ spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
+ if (atomic_read(&T_TASK(cmd)->t_transport_timeout) > 1) {
+ int tmp = (atomic_read(&T_TASK(cmd)->t_transport_timeout) - 1);
+
+ atomic_sub(tmp, &T_TASK(cmd)->t_se_count);
+ }
+ spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+
+ transport_generic_remove(cmd, 0, 0);
+}
+
+static int
+transport_generic_allocate_buf(struct se_cmd *cmd, u32 data_length)
+{
+ unsigned char *buf;
+
+ buf = kzalloc(data_length, GFP_KERNEL);
+ if (!(buf)) {
+ printk(KERN_ERR "Unable to allocate memory for buffer\n");
+ return -1;
+ }
+
+ T_TASK(cmd)->t_tasks_se_num = 0;
+ T_TASK(cmd)->t_task_buf = buf;
+
+ return 0;
+}
+
+static inline u32 transport_lba_21(unsigned char *cdb)
+{
+ return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
+}
+
+static inline u32 transport_lba_32(unsigned char *cdb)
+{
+ return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
+}
+
+static inline unsigned long long transport_lba_64(unsigned char *cdb)
+{
+ unsigned int __v1, __v2;
+
+ __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
+ __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
+
+ return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
+}
+
+/*
+ * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
+ */
+static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
+{
+ unsigned int __v1, __v2;
+
+ __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
+ __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
+
+ return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
+}
+
+static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&T_TASK(se_cmd)->t_state_lock, flags);
+ se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
+ spin_unlock_irqrestore(&T_TASK(se_cmd)->t_state_lock, flags);
+}
+
+/*
+ * Called from interrupt context.
+ */
+static void transport_task_timeout_handler(unsigned long data)
+{
+ struct se_task *task = (struct se_task *)data;
+ struct se_cmd *cmd = TASK_CMD(task);
+ unsigned long flags;
+
+ DEBUG_TT("transport task timeout fired! task: %p cmd: %p\n", task, cmd);
+
+ spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
+ if (task->task_flags & TF_STOP) {
+ spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+ return;
+ }
+ task->task_flags &= ~TF_RUNNING;
+
+ /*
+ * Determine if transport_complete_task() has already been called.
+ */
+ if (!(atomic_read(&task->task_active))) {
+ DEBUG_TT("transport task: %p cmd: %p timeout task_active"
+ " == 0\n", task, cmd);
+ spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+ return;
+ }
+
+ atomic_inc(&T_TASK(cmd)->t_se_count);
+ atomic_inc(&T_TASK(cmd)->t_transport_timeout);
+ T_TASK(cmd)->t_tasks_failed = 1;
+
+ atomic_set(&task->task_timeout, 1);
+ task->task_error_status = PYX_TRANSPORT_TASK_TIMEOUT;
+ task->task_scsi_status = 1;
+
+ if (atomic_read(&task->task_stop)) {
+ DEBUG_TT("transport task: %p cmd: %p timeout task_stop"
+ " == 1\n", task, cmd);
+ spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+ complete(&task->task_stop_comp);
+ return;
+ }
+
+ if (!(atomic_dec_and_test(&T_TASK(cmd)->t_task_cdbs_left))) {
+ DEBUG_TT("transport task: %p cmd: %p timeout non zero"
+ " t_task_cdbs_left\n", task, cmd);
+ spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+ return;
+ }
+ DEBUG_TT("transport task: %p cmd: %p timeout ZERO t_task_cdbs_left\n",
+ task, cmd);
+
+ cmd->t_state = TRANSPORT_COMPLETE_FAILURE;
+ spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+
+ transport_add_cmd_to_queue(cmd, TRANSPORT_COMPLETE_FAILURE);
+}
+
+/*
+ * Called with T_TASK(cmd)->t_state_lock held.
+ */
+static void transport_start_task_timer(struct se_task *task)
+{
+ struct se_device *dev = task->se_dev;
+ int timeout;
+
+ if (task->task_flags & TF_RUNNING)
+ return;
+ /*
+ * If the task_timeout is disabled, exit now.
+ */
+ timeout = DEV_ATTRIB(dev)->task_timeout;
+ if (!(timeout))
+ return;
+
+ init_timer(&task->task_timer);
+ task->task_timer.expires = (get_jiffies_64() + timeout * HZ);
+ task->task_timer.data = (unsigned long) task;
+ task->task_timer.function = transport_task_timeout_handler;
+
+ task->task_flags |= TF_RUNNING;
+ add_timer(&task->task_timer);
+#if 0
+ printk(KERN_INFO "Starting task timer for cmd: %p task: %p seconds:"
+ " %d\n", task->task_se_cmd, task, timeout);
+#endif
+}
+
+/*
+ * Called with spin_lock_irq(&T_TASK(cmd)->t_state_lock) held.
+ */
+void __transport_stop_task_timer(struct se_task *task, unsigned long *flags)
+{
+ struct se_cmd *cmd = TASK_CMD(task);
+
+ if (!(task->task_flags & TF_RUNNING))
+ return;
+
+ task->task_flags |= TF_STOP;
+ spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, *flags);
+
+ del_timer_sync(&task->task_timer);
+
+ spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, *flags);
+ task->task_flags &= ~TF_RUNNING;
+ task->task_flags &= ~TF_STOP;
+}
+
+static void transport_stop_all_task_timers(struct se_cmd *cmd)
+{
+ struct se_task *task = NULL, *task_tmp;
+ unsigned long flags;
+
+ spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
+ list_for_each_entry_safe(task, task_tmp,
+ &T_TASK(cmd)->t_task_list, t_list)
+ __transport_stop_task_timer(task, &flags);
+ spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+}
+
+static inline int transport_tcq_window_closed(struct se_device *dev)
+{
+ if (dev->dev_tcq_window_closed++ <
+ PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD) {
+ msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT);
+ } else
+ msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG);
+
+ wake_up_interruptible(&dev->dev_queue_obj->thread_wq);
+ return 0;
+}
+
+/*
+ * Called from Fabric Module context from transport_execute_tasks()
+ *
+ * The return of this function determins if the tasks from struct se_cmd
+ * get added to the execution queue in transport_execute_tasks(),
+ * or are added to the delayed or ordered lists here.
+ */
+static inline int transport_execute_task_attr(struct se_cmd *cmd)
+{
+ if (SE_DEV(cmd)->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
+ return 1;
+ /*
+ * Check for the existance 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.
+ */
+ if (cmd->sam_task_attr == TASK_ATTR_HOQ) {
+ atomic_inc(&SE_DEV(cmd)->dev_hoq_count);
+ smp_mb__after_atomic_inc();
+ DEBUG_STA("Added HEAD_OF_QUEUE for CDB:"
+ " 0x%02x, se_ordered_id: %u\n",
+ T_TASK(cmd)->t_task_cdb[0],
+ cmd->se_ordered_id);
+ return 1;
+ } else if (cmd->sam_task_attr == TASK_ATTR_ORDERED) {
+ spin_lock(&SE_DEV(cmd)->ordered_cmd_lock);
+ list_add_tail(&cmd->se_ordered_list,
+ &SE_DEV(cmd)->ordered_cmd_list);
+ spin_unlock(&SE_DEV(cmd)->ordered_cmd_lock);
+
+ atomic_inc(&SE_DEV(cmd)->dev_ordered_sync);
+ smp_mb__after_atomic_inc();
+
+ DEBUG_STA("Added ORDERED for CDB: 0x%02x to ordered"
+ " list, se_ordered_id: %u\n",
+ T_TASK(cmd)->t_task_cdb[0],
+ cmd->se_ordered_id);
+ /*
+ * Add ORDERED command to tail of execution queue if
+ * no other older commands exist that need to be
+ * completed first.
+ */
+ if (!(atomic_read(&SE_DEV(cmd)->simple_cmds)))
+ return 1;
+ } else {
+ /*
+ * For SIMPLE and UNTAGGED Task Attribute commands
+ */
+ atomic_inc(&SE_DEV(cmd)->simple_cmds);
+ smp_mb__after_atomic_inc();
+ }
+ /*
+ * Otherwise if one or more outstanding ORDERED task attribute exist,
+ * add the dormant task(s) built for the passed struct se_cmd to the
+ * execution queue and become in Active state for this struct se_device.
+ */
+ if (atomic_read(&SE_DEV(cmd)->dev_ordered_sync) != 0) {
+ /*
+ * Otherwise, add cmd w/ tasks to delayed cmd queue that
+ * will be drained upon competion of HEAD_OF_QUEUE task.
+ */
+ spin_lock(&SE_DEV(cmd)->delayed_cmd_lock);
+ cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR;
+ list_add_tail(&cmd->se_delayed_list,
+ &SE_DEV(cmd)->delayed_cmd_list);
+ spin_unlock(&SE_DEV(cmd)->delayed_cmd_lock);
+
+ DEBUG_STA("Added CDB: 0x%02x Task Attr: 0x%02x to"
+ " delayed CMD list, se_ordered_id: %u\n",
+ T_TASK(cmd)->t_task_cdb[0], cmd->sam_task_attr,
+ cmd->se_ordered_id);
+ /*
+ * Return zero to let transport_execute_tasks() know
+ * not to add the delayed tasks to the execution list.
+ */
+ return 0;
+ }
+ /*
+ * Otherwise, no ORDERED task attributes exist..
+ */
+ return 1;
+}
+
+/*
+ * Called from fabric module context in transport_generic_new_cmd() and
+ * transport_generic_process_write()
+ */
+static int transport_execute_tasks(struct se_cmd *cmd)
+{
+ int add_tasks;
+
+ if (!(cmd->se_cmd_flags & SCF_SE_DISABLE_ONLINE_CHECK)) {
+ if (se_dev_check_online(cmd->se_orig_obj_ptr) != 0) {
+ cmd->transport_error_status =
+ PYX_TRANSPORT_LU_COMM_FAILURE;
+ transport_generic_request_failure(cmd, NULL, 0, 1);
+ return 0;
+ }
+ }
+ /*
+ * Call transport_cmd_check_stop() to see if a fabric exception
+ * has occured that prevents execution.
+ */
+ if (!(transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING))) {
+ /*
+ * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
+ * attribute for the tasks of the received struct se_cmd CDB
+ */
+ add_tasks = transport_execute_task_attr(cmd);
+ if (add_tasks == 0)
+ goto execute_tasks;
+ /*
+ * This calls transport_add_tasks_from_cmd() to handle
+ * HEAD_OF_QUEUE ordering for SAM Task Attribute emulation
+ * (if enabled) in __transport_add_task_to_execute_queue() and
+ * transport_add_task_check_sam_attr().
+ */
+ transport_add_tasks_from_cmd(cmd);
+ }
+ /*
+ * Kick the execution queue for the cmd associated struct se_device
+ * storage object.
+ */
+execute_tasks:
+ __transport_execute_tasks(SE_DEV(cmd));
+ return 0;
+}
+
+/*
+ * Called to check struct se_device tcq depth window, and once open pull struct se_task
+ * from struct se_device->execute_task_list and
+ *
+ * Called from transport_processing_thread()
+ */
+static int __transport_execute_tasks(struct se_device *dev)
+{
+ int error;
+ struct se_cmd *cmd = NULL;
+ struct se_task *task;
+ unsigned long flags;
+
+ /*
+ * Check if there is enough room in the device and HBA queue to send
+ * struct se_transport_task's to the selected transport.
+ */
+check_depth:
+ spin_lock_irqsave(&SE_HBA(dev)->hba_queue_lock, flags);
+ if (!(atomic_read(&dev->depth_left)) ||
+ !(atomic_read(&SE_HBA(dev)->left_queue_depth))) {
+ spin_unlock_irqrestore(&SE_HBA(dev)->hba_queue_lock, flags);
+ return transport_tcq_window_closed(dev);
+ }
+ dev->dev_tcq_window_closed = 0;
+
+ spin_lock(&dev->execute_task_lock);
+ task = transport_get_task_from_execute_queue(dev);
+ spin_unlock(&dev->execute_task_lock);
+
+ if (!task) {
+ spin_unlock_irqrestore(&SE_HBA(dev)->hba_queue_lock, flags);
+ return 0;
+ }
+
+ atomic_dec(&dev->depth_left);
+ atomic_dec(&SE_HBA(dev)->left_queue_depth);
+ spin_unlock_irqrestore(&SE_HBA(dev)->hba_queue_lock, flags);
+
+ cmd = TASK_CMD(task);
+
+ spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
+ atomic_set(&task->task_active, 1);
+ atomic_set(&task->task_sent, 1);
+ atomic_inc(&T_TASK(cmd)->t_task_cdbs_sent);
+
+ if (atomic_read(&T_TASK(cmd)->t_task_cdbs_sent) ==
+ T_TASK(cmd)->t_task_cdbs)
+ atomic_set(&cmd->transport_sent, 1);
+
+ transport_start_task_timer(task);
+ spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+ /*
+ * The struct se_cmd->transport_emulate_cdb() function pointer is used
+ * to grab REPORT_LUNS CDBs before they hit the
+ * struct se_subsystem_api->do_task() caller below.
+ */
+ if (cmd->transport_emulate_cdb) {
+ error = cmd->transport_emulate_cdb(cmd);
+ if (error != 0) {
+ cmd->transport_error_status = error;
+ atomic_set(&task->task_active, 0);
+ atomic_set(&cmd->transport_sent, 0);
+ transport_stop_tasks_for_cmd(cmd);
+ transport_generic_request_failure(cmd, dev, 0, 1);
+ goto check_depth;
+ }
+ /*
+ * Handle the successful completion for transport_emulate_cdb()
+ * for synchronous operation, following SCF_EMULATE_CDB_ASYNC
+ * Otherwise the caller is expected to complete the task with
+ * proper status.
+ */
+ if (!(cmd->se_cmd_flags & SCF_EMULATE_CDB_ASYNC)) {
+ cmd->scsi_status = SAM_STAT_GOOD;
+ task->task_scsi_status = GOOD;
+ transport_complete_task(task, 1);
+ }
+ } else {
+ /*
+ * Currently for all virtual TCM plugins including IBLOCK, FILEIO and
+ * RAMDISK we use the internal transport_emulate_control_cdb() logic
+ * with struct se_subsystem_api callers for the primary SPC-3 TYPE_DISK
+ * LUN emulation code.
+ *
+ * For TCM/pSCSI and all other SCF_SCSI_DATA_SG_IO_CDB I/O tasks we
+ * call ->do_task() directly and let the underlying TCM subsystem plugin
+ * code handle the CDB emulation.
+ */
+ if ((TRANSPORT(dev)->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) &&
+ (!(TASK_CMD(task)->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)))
+ error = transport_emulate_control_cdb(task);
+ else
+ error = TRANSPORT(dev)->do_task(task);
+
+ if (error != 0) {
+ cmd->transport_error_status = error;
+ atomic_set(&task->task_active, 0);
+ atomic_set(&cmd->transport_sent, 0);
+ transport_stop_tasks_for_cmd(cmd);
+ transport_generic_request_failure(cmd, dev, 0, 1);
+ }
+ }
+
+ goto check_depth;
+
+ return 0;
+}
+
+void transport_new_cmd_failure(struct se_cmd *se_cmd)
+{
+ unsigned long flags;
+ /*
+ * Any unsolicited data will get dumped for failed command inside of
+ * the fabric plugin
+ */
+ spin_lock_irqsave(&T_TASK(se_cmd)->t_state_lock, flags);
+ se_cmd->se_cmd_flags |= SCF_SE_CMD_FAILED;
+ se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
+ spin_unlock_irqrestore(&T_TASK(se_cmd)->t_state_lock, flags);
+
+ CMD_TFO(se_cmd)->new_cmd_failure(se_cmd);
+}
+
+static void transport_nop_wait_for_tasks(struct se_cmd *, int, int);
+
+static inline u32 transport_get_sectors_6(
+ unsigned char *cdb,
+ struct se_cmd *cmd,
+ int *ret)
+{
+ struct se_device *dev = SE_LUN(cmd)->lun_se_dev;
+
+ /*
+ * Assume TYPE_DISK for non struct se_device objects.
+ * Use 8-bit sector value.
+ */
+ if (!dev)
+ goto type_disk;
+
+ /*
+ * Use 24-bit allocation length for TYPE_TAPE.
+ */
+ if (TRANSPORT(dev)->get_device_type(dev) == TYPE_TAPE)
+ return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4];
+
+ /*
+ * Everything else assume TYPE_DISK Sector CDB location.
+ * Use 8-bit sector value.
+ */
+type_disk:
+ return (u32)cdb[4];
+}
+
+static inline u32 transport_get_sectors_10(
+ unsigned char *cdb,
+ struct se_cmd *cmd,
+ int *ret)
+{
+ struct se_device *dev = SE_LUN(cmd)->lun_se_dev;
+
+ /*
+ * Assume TYPE_DISK for non struct se_device objects.
+ * Use 16-bit sector value.
+ */
+ if (!dev)
+ goto type_disk;
+
+ /*
+ * XXX_10 is not defined in SSC, throw an exception
+ */
+ if (TRANSPORT(dev)->get_device_type(dev) == TYPE_TAPE) {
+ *ret = -1;
+ return 0;
+ }
+
+ /*
+ * Everything else assume TYPE_DISK Sector CDB location.
+ * Use 16-bit sector value.
+ */
+type_disk:
+ return (u32)(cdb[7] << 8) + cdb[8];
+}
+
+static inline u32 transport_get_sectors_12(
+ unsigned char *cdb,
+ struct se_cmd *cmd,
+ int *ret)
+{
+ struct se_device *dev = SE_LUN(cmd)->lun_se_dev;
+
+ /*
+ * Assume TYPE_DISK for non struct se_device objects.
+ * Use 32-bit sector value.
+ */
+ if (!dev)
+ goto type_disk;
+
+ /*
+ * XXX_12 is not defined in SSC, throw an exception
+ */
+ if (TRANSPORT(dev)->get_device_type(dev) == TYPE_TAPE) {
+ *ret = -1;
+ return 0;
+ }
+
+ /*
+ * Everything else assume TYPE_DISK Sector CDB location.
+ * Use 32-bit sector value.
+ */
+type_disk:
+ return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
+}
+
+static inline u32 transport_get_sectors_16(
+ unsigned char *cdb,
+ struct se_cmd *cmd,
+ int *ret)
+{
+ struct se_device *dev = SE_LUN(cmd)->lun_se_dev;
+
+ /*
+ * Assume TYPE_DISK for non struct se_device objects.
+ * Use 32-bit sector value.
+ */
+ if (!dev)
+ goto type_disk;
+
+ /*
+ * Use 24-bit allocation length for TYPE_TAPE.
+ */
+ if (TRANSPORT(dev)->get_device_type(dev) == TYPE_TAPE)
+ return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14];
+
+type_disk:
+ return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
+ (cdb[12] << 8) + cdb[13];
+}
+
+/*
+ * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
+ */
+static inline u32 transport_get_sectors_32(
+ unsigned char *cdb,
+ struct se_cmd *cmd,
+ int *ret)
+{
+ /*
+ * Assume TYPE_DISK for non struct se_device objects.
+ * Use 32-bit sector value.
+ */
+ return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
+ (cdb[30] << 8) + cdb[31];
+
+}
+
+static inline u32 transport_get_size(
+ u32 sectors,
+ unsigned char *cdb,
+ struct se_cmd *cmd)
+{
+ struct se_device *dev = SE_DEV(cmd);
+
+ if (TRANSPORT(dev)->get_device_type(dev) == TYPE_TAPE) {
+ if (cdb[1] & 1) { /* sectors */
+ return DEV_ATTRIB(dev)->block_size * sectors;
+ } else /* bytes */
+ return sectors;
+ }
+#if 0
+ printk(KERN_INFO "Returning block_size: %u, sectors: %u == %u for"
+ " %s object\n", DEV_ATTRIB(dev)->block_size, sectors,
+ DEV_ATTRIB(dev)->block_size * sectors,
+ TRANSPORT(dev)->name);
+#endif
+ return DEV_ATTRIB(dev)->block_size * sectors;
+}
+
+unsigned char transport_asciihex_to_binaryhex(unsigned char val[2])
+{
+ unsigned char result = 0;
+ /*
+ * MSB
+ */
+ if ((val[0] >= 'a') && (val[0] <= 'f'))
+ result = ((val[0] - 'a' + 10) & 0xf) << 4;
+ else
+ if ((val[0] >= 'A') && (val[0] <= 'F'))
+ result = ((val[0] - 'A' + 10) & 0xf) << 4;
+ else /* digit */
+ result = ((val[0] - '0') & 0xf) << 4;
+ /*
+ * LSB
+ */
+ if ((val[1] >= 'a') && (val[1] <= 'f'))
+ result |= ((val[1] - 'a' + 10) & 0xf);
+ else
+ if ((val[1] >= 'A') && (val[1] <= 'F'))
+ result |= ((val[1] - 'A' + 10) & 0xf);
+ else /* digit */
+ result |= ((val[1] - '0') & 0xf);
+
+ return result;
+}
+EXPORT_SYMBOL(transport_asciihex_to_binaryhex);
+
+static void transport_xor_callback(struct se_cmd *cmd)
+{
+ unsigned char *buf, *addr;
+ struct se_mem *se_mem;
+ unsigned int offset;
+ int i;
+ /*
+ * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
+ *
+ * 1) read the specified logical block(s);
+ * 2) transfer logical blocks from the data-out buffer;
+ * 3) XOR the logical blocks transferred from the data-out buffer with
+ * the logical blocks read, storing the resulting XOR data in a buffer;
+ * 4) if the DISABLE WRITE bit is set to zero, then write the logical
+ * blocks transferred from the data-out buffer; and
+ * 5) transfer the resulting XOR data to the data-in buffer.
+ */
+ buf = kmalloc(cmd->data_length, GFP_KERNEL);
+ if (!(buf)) {
+ printk(KERN_ERR "Unable to allocate xor_callback buf\n");
+ return;
+ }
+ /*
+ * Copy the scatterlist WRITE buffer located at T_TASK(cmd)->t_mem_list
+ * into the locally allocated *buf
+ */
+ transport_memcpy_se_mem_read_contig(cmd, buf, T_TASK(cmd)->t_mem_list);
+ /*
+ * Now perform the XOR against the BIDI read memory located at
+ * T_TASK(cmd)->t_mem_bidi_list
+ */
+
+ offset = 0;
+ list_for_each_entry(se_mem, T_TASK(cmd)->t_mem_bidi_list, se_list) {
+ addr = (unsigned char *)kmap_atomic(se_mem->se_page, KM_USER0);
+ if (!(addr))
+ goto out;
+
+ for (i = 0; i < se_mem->se_len; i++)
+ *(addr + se_mem->se_off + i) ^= *(buf + offset + i);
+
+ offset += se_mem->se_len;
+ kunmap_atomic(addr, KM_USER0);
+ }
+out:
+ kfree(buf);
+}
+
+/*
+ * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
+ */
+static int transport_get_sense_data(struct se_cmd *cmd)
+{
+ unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
+ struct se_device *dev;
+ struct se_task *task = NULL, *task_tmp;
+ unsigned long flags;
+ u32 offset = 0;
+
+ if (!SE_LUN(cmd)) {
+ printk(KERN_ERR "SE_LUN(cmd) is NULL\n");
+ return -1;
+ }
+ spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
+ if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
+ spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+ return 0;
+ }
+
+ list_for_each_entry_safe(task, task_tmp,
+ &T_TASK(cmd)->t_task_list, t_list) {
+
+ if (!task->task_sense)
+ continue;
+
+ dev = task->se_dev;
+ if (!(dev))
+ continue;
+
+ if (!TRANSPORT(dev)->get_sense_buffer) {
+ printk(KERN_ERR "TRANSPORT(dev)->get_sense_buffer"
+ " is NULL\n");
+ continue;
+ }
+
+ sense_buffer = TRANSPORT(dev)->get_sense_buffer(task);
+ if (!(sense_buffer)) {
+ printk(KERN_ERR "ITT[0x%08x]_TASK[%d]: Unable to locate"
+ " sense buffer for task with sense\n",
+ CMD_TFO(cmd)->get_task_tag(cmd), task->task_no);
+ continue;
+ }
+ spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+
+ offset = CMD_TFO(cmd)->set_fabric_sense_len(cmd,
+ TRANSPORT_SENSE_BUFFER);
+
+ memcpy((void *)&buffer[offset], (void *)sense_buffer,
+ TRANSPORT_SENSE_BUFFER);
+ cmd->scsi_status = task->task_scsi_status;
+ /* Automatically padded */
+ cmd->scsi_sense_length =
+ (TRANSPORT_SENSE_BUFFER + offset);
+
+ printk(KERN_INFO "HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
+ " and sense\n",
+ dev->se_hba->hba_id, TRANSPORT(dev)->name,
+ cmd->scsi_status);
+ return 0;
+ }
+ spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+
+ return -1;
+}
+
+static int transport_allocate_resources(struct se_cmd *cmd)
+{
+ u32 length = cmd->data_length;
+
+ if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
+ (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB))
+ return transport_generic_get_mem(cmd, length, PAGE_SIZE);
+ else if (cmd->se_cmd_flags & SCF_SCSI_CONTROL_NONSG_IO_CDB)
+ return transport_generic_allocate_buf(cmd, length);
+ else
+ return 0;
+}
+
+static int
+transport_handle_reservation_conflict(struct se_cmd *cmd)
+{
+ cmd->transport_wait_for_tasks = &transport_nop_wait_for_tasks;
+ cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
+ cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
+ 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 (SE_SESS(cmd) &&
+ DEV_ATTRIB(cmd->se_dev)->emulate_ua_intlck_ctrl == 2)
+ core_scsi3_ua_allocate(SE_SESS(cmd)->se_node_acl,
+ cmd->orig_fe_lun, 0x2C,
+ ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
+ return -2;
+}
+
+/* transport_generic_cmd_sequencer():
+ *
+ * Generic Command Sequencer that should work for most DAS transport
+ * drivers.
+ *
+ * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
+ * RX Thread.
+ *
+ * FIXME: Need to support other SCSI OPCODES where as well.
+ */
+static int transport_generic_cmd_sequencer(
+ struct se_cmd *cmd,
+ unsigned char *cdb)
+{
+ struct se_device *dev = SE_DEV(cmd);
+ struct se_subsystem_dev *su_dev = dev->se_sub_dev;
+ int ret = 0, sector_ret = 0, passthrough;
+ u32 sectors = 0, size = 0, pr_reg_type = 0;
+ u16 service_action;
+ u8 alua_ascq = 0;
+ /*
+ * Check for an existing UNIT ATTENTION condition
+ */
+ if (core_scsi3_ua_check(cmd, cdb) < 0) {
+ cmd->transport_wait_for_tasks =
+ &transport_nop_wait_for_tasks;
+ cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
+ cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
+ return -2;
+ }
+ /*
+ * Check status of Asymmetric Logical Unit Assignment port
+ */
+ ret = T10_ALUA(su_dev)->alua_state_check(cmd, cdb, &alua_ascq);
+ if (ret != 0) {
+ cmd->transport_wait_for_tasks = &transport_nop_wait_for_tasks;
+ /*
+ * Set SCSI additional sense code (ASC) to 'LUN Not Accessable';
+ * The ALUA additional sense code qualifier (ASCQ) is determined
+ * by the ALUA primary or secondary access state..
+ */
+ if (ret > 0) {
+#if 0
+ printk(KERN_INFO "[%s]: ALUA TG Port not available,"
+ " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
+ CMD_TFO(cmd)->get_fabric_name(), alua_ascq);
+#endif
+ transport_set_sense_codes(cmd, 0x04, alua_ascq);
+ cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
+ cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
+ return -2;
+ }
+ goto out_invalid_cdb_field;
+ }
+ /*
+ * Check status for SPC-3 Persistent Reservations
+ */
+ if (T10_PR_OPS(su_dev)->t10_reservation_check(cmd, &pr_reg_type) != 0) {
+ if (T10_PR_OPS(su_dev)->t10_seq_non_holder(
+ cmd, cdb, pr_reg_type) != 0)
+ return transport_handle_reservation_conflict(cmd);
+ /*
+ * This means the CDB is allowed for the SCSI Initiator port
+ * when said port is *NOT* holding the legacy SPC-2 or
+ * SPC-3 Persistent Reservation.
+ */
+ }
+
+ switch (cdb[0]) {
+ case READ_6:
+ sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
+ if (sector_ret)
+ goto out_unsupported_cdb;
+ size = transport_get_size(sectors, cdb, cmd);
+ cmd->transport_split_cdb = &split_cdb_XX_6;
+ T_TASK(cmd)->t_task_lba = transport_lba_21(cdb);
+ cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
+ break;
+ case READ_10:
+ sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
+ if (sector_ret)
+ goto out_unsupported_cdb;
+ size = transport_get_size(sectors, cdb, cmd);
+ cmd->transport_split_cdb = &split_cdb_XX_10;
+ T_TASK(cmd)->t_task_lba = transport_lba_32(cdb);
+ cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
+ break;
+ case READ_12:
+ sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
+ if (sector_ret)
+ goto out_unsupported_cdb;
+ size = transport_get_size(sectors, cdb, cmd);
+ cmd->transport_split_cdb = &split_cdb_XX_12;
+ T_TASK(cmd)->t_task_lba = transport_lba_32(cdb);
+ cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
+ break;
+ case READ_16:
+ sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
+ if (sector_ret)
+ goto out_unsupported_cdb;
+ size = transport_get_size(sectors, cdb, cmd);
+ cmd->transport_split_cdb = &split_cdb_XX_16;
+ T_TASK(cmd)->t_task_lba = transport_lba_64(cdb);
+ cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
+ break;
+ case WRITE_6:
+ sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
+ if (sector_ret)
+ goto out_unsupported_cdb;
+ size = transport_get_size(sectors, cdb, cmd);
+ cmd->transport_split_cdb = &split_cdb_XX_6;
+ T_TASK(cmd)->t_task_lba = transport_lba_21(cdb);
+ cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
+ break;
+ case WRITE_10:
+ sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
+ if (sector_ret)
+ goto out_unsupported_cdb;
+ size = transport_get_size(sectors, cdb, cmd);
+ cmd->transport_split_cdb = &split_cdb_XX_10;
+ T_TASK(cmd)->t_task_lba = transport_lba_32(cdb);
+ T_TASK(cmd)->t_tasks_fua = (cdb[1] & 0x8);
+ cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
+ break;
+ case WRITE_12:
+ sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
+ if (sector_ret)
+ goto out_unsupported_cdb;
+ size = transport_get_size(sectors, cdb, cmd);
+ cmd->transport_split_cdb = &split_cdb_XX_12;
+ T_TASK(cmd)->t_task_lba = transport_lba_32(cdb);
+ T_TASK(cmd)->t_tasks_fua = (cdb[1] & 0x8);
+ cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
+ break;
+ case WRITE_16:
+ sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
+ if (sector_ret)
+ goto out_unsupported_cdb;
+ size = transport_get_size(sectors, cdb, cmd);
+ cmd->transport_split_cdb = &split_cdb_XX_16;
+ T_TASK(cmd)->t_task_lba = transport_lba_64(cdb);
+ T_TASK(cmd)->t_tasks_fua = (cdb[1] & 0x8);
+ cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
+ break;
+ case XDWRITEREAD_10:
+ if ((cmd->data_direction != DMA_TO_DEVICE) ||
+ !(T_TASK(cmd)->t_tasks_bidi))
+ goto out_invalid_cdb_field;
+ sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
+ if (sector_ret)
+ goto out_unsupported_cdb;
+ size = transport_get_size(sectors, cdb, cmd);
+ cmd->transport_split_cdb = &split_cdb_XX_10;
+ T_TASK(cmd)->t_task_lba = transport_lba_32(cdb);
+ cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
+ passthrough = (TRANSPORT(dev)->transport_type ==
+ TRANSPORT_PLUGIN_PHBA_PDEV);
+ /*
+ * Skip the remaining assignments for TCM/PSCSI passthrough
+ */
+ if (passthrough)
+ break;
+ /*
+ * Setup BIDI XOR callback to be run during transport_generic_complete_ok()
+ */
+ cmd->transport_complete_callback = &transport_xor_callback;
+ T_TASK(cmd)->t_tasks_fua = (cdb[1] & 0x8);
+ break;
+ case VARIABLE_LENGTH_CMD:
+ service_action = get_unaligned_be16(&cdb[8]);
+ /*
+ * Determine if this is TCM/PSCSI device and we should disable
+ * internal emulation for this CDB.
+ */
+ passthrough = (TRANSPORT(dev)->transport_type ==
+ TRANSPORT_PLUGIN_PHBA_PDEV);
+
+ switch (service_action) {
+ case XDWRITEREAD_32:
+ sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
+ if (sector_ret)
+ goto out_unsupported_cdb;
+ size = transport_get_size(sectors, cdb, cmd);
+ /*
+ * Use WRITE_32 and READ_32 opcodes for the emulated
+ * XDWRITE_READ_32 logic.
+ */
+ cmd->transport_split_cdb = &split_cdb_XX_32;
+ T_TASK(cmd)->t_task_lba = transport_lba_64_ext(cdb);
+ cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
+
+ /*
+ * Skip the remaining assignments for TCM/PSCSI passthrough
+ */
+ if (passthrough)
+ break;
+
+ /*
+ * Setup BIDI XOR callback to be run during
+ * transport_generic_complete_ok()
+ */
+ cmd->transport_complete_callback = &transport_xor_callback;
+ T_TASK(cmd)->t_tasks_fua = (cdb[10] & 0x8);
+ break;
+ case WRITE_SAME_32:
+ sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
+ if (sector_ret)
+ goto out_unsupported_cdb;
+ size = transport_get_size(sectors, cdb, cmd);
+ T_TASK(cmd)->t_task_lba = get_unaligned_be64(&cdb[12]);
+ cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
+
+ /*
+ * Skip the remaining assignments for TCM/PSCSI passthrough
+ */
+ if (passthrough)
+ break;
+
+ if ((cdb[10] & 0x04) || (cdb[10] & 0x02)) {
+ printk(KERN_ERR "WRITE_SAME PBDATA and LBDATA"
+ " bits not supported for Block Discard"
+ " Emulation\n");
+ goto out_invalid_cdb_field;
+ }
+ /*
+ * Currently for the emulated case we only accept
+ * tpws with the UNMAP=1 bit set.
+ */
+ if (!(cdb[10] & 0x08)) {
+ printk(KERN_ERR "WRITE_SAME w/o UNMAP bit not"
+ " supported for Block Discard Emulation\n");
+ goto out_invalid_cdb_field;
+ }
+ break;
+ default:
+ printk(KERN_ERR "VARIABLE_LENGTH_CMD service action"
+ " 0x%04x not supported\n", service_action);
+ goto out_unsupported_cdb;
+ }
+ break;
+ case 0xa3:
+ if (TRANSPORT(dev)->get_device_type(dev) != TYPE_ROM) {
+ /* MAINTENANCE_IN from SCC-2 */
+ /*
+ * Check for emulated MI_REPORT_TARGET_PGS.
+ */
+ if (cdb[1] == MI_REPORT_TARGET_PGS) {
+ cmd->transport_emulate_cdb =
+ (T10_ALUA(su_dev)->alua_type ==
+ SPC3_ALUA_EMULATED) ?
+ &core_emulate_report_target_port_groups :
+ NULL;
+ }
+ size = (cdb[6] << 24) | (cdb[7] << 16) |
+ (cdb[8] << 8) | cdb[9];
+ } else {
+ /* GPCMD_SEND_KEY from multi media commands */
+ size = (cdb[8] << 8) + cdb[9];
+ }
+ cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
+ break;
+ case MODE_SELECT:
+ size = cdb[4];
+ cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
+ break;
+ case MODE_SELECT_10:
+ size = (cdb[7] << 8) + cdb[8];
+ cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
+ break;
+ case MODE_SENSE:
+ size = cdb[4];
+ cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
+ break;
+ case MODE_SENSE_10:
+ case GPCMD_READ_BUFFER_CAPACITY:
+ case GPCMD_SEND_OPC:
+ case LOG_SELECT:
+ case LOG_SENSE:
+ size = (cdb[7] << 8) + cdb[8];
+ cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
+ break;
+ case READ_BLOCK_LIMITS:
+ size = READ_BLOCK_LEN;
+ cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
+ break;
+ case GPCMD_GET_CONFIGURATION:
+ case GPCMD_READ_FORMAT_CAPACITIES:
+ case GPCMD_READ_DISC_INFO:
+ case GPCMD_READ_TRACK_RZONE_INFO:
+ size = (cdb[7] << 8) + cdb[8];
+ cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
+ break;
+ case PERSISTENT_RESERVE_IN:
+ case PERSISTENT_RESERVE_OUT:
+ cmd->transport_emulate_cdb =
+ (T10_RES(su_dev)->res_type ==
+ SPC3_PERSISTENT_RESERVATIONS) ?
+ &core_scsi3_emulate_pr : NULL;
+ size = (cdb[7] << 8) + cdb[8];
+ cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
+ break;
+ case GPCMD_MECHANISM_STATUS:
+ case GPCMD_READ_DVD_STRUCTURE:
+ size = (cdb[8] << 8) + cdb[9];
+ cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
+ break;
+ case READ_POSITION:
+ size = READ_POSITION_LEN;
+ cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
+ break;
+ case 0xa4:
+ if (TRANSPORT(dev)->get_device_type(dev) != TYPE_ROM) {
+ /* MAINTENANCE_OUT from SCC-2
+ *
+ * Check for emulated MO_SET_TARGET_PGS.
+ */
+ if (cdb[1] == MO_SET_TARGET_PGS) {
+ cmd->transport_emulate_cdb =
+ (T10_ALUA(su_dev)->alua_type ==
+ SPC3_ALUA_EMULATED) ?
+ &core_emulate_set_target_port_groups :
+ NULL;
+ }
+
+ size = (cdb[6] << 24) | (cdb[7] << 16) |
+ (cdb[8] << 8) | cdb[9];
+ } else {
+ /* GPCMD_REPORT_KEY from multi media commands */
+ size = (cdb[8] << 8) + cdb[9];
+ }
+ cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
+ break;
+ case INQUIRY:
+ size = (cdb[3] << 8) + cdb[4];
+ /*
+ * Do implict HEAD_OF_QUEUE processing for INQUIRY.
+ * See spc4r17 section 5.3
+ */
+ if (SE_DEV(cmd)->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
+ cmd->sam_task_attr = TASK_ATTR_HOQ;
+ cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
+ break;
+ case READ_BUFFER:
+ size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
+ cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
+ break;
+ case READ_CAPACITY:
+ size = READ_CAP_LEN;
+ cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
+ break;
+ case READ_MEDIA_SERIAL_NUMBER:
+ case SECURITY_PROTOCOL_IN:
+ case SECURITY_PROTOCOL_OUT:
+ size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
+ cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
+ break;
+ case SERVICE_ACTION_IN:
+ case ACCESS_CONTROL_IN:
+ case ACCESS_CONTROL_OUT:
+ case EXTENDED_COPY:
+ case READ_ATTRIBUTE:
+ case RECEIVE_COPY_RESULTS:
+ case WRITE_ATTRIBUTE:
+ size = (cdb[10] << 24) | (cdb[11] << 16) |
+ (cdb[12] << 8) | cdb[13];
+ cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
+ break;
+ case RECEIVE_DIAGNOSTIC:
+ case SEND_DIAGNOSTIC:
+ size = (cdb[3] << 8) | cdb[4];
+ cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
+ break;
+/* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
+#if 0
+ case GPCMD_READ_CD:
+ sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
+ size = (2336 * sectors);
+ cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
+ break;
+#endif
+ case READ_TOC:
+ size = cdb[8];
+ cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
+ break;
+ case REQUEST_SENSE:
+ size = cdb[4];
+ cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
+ break;
+ case READ_ELEMENT_STATUS:
+ size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
+ cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
+ break;
+ case WRITE_BUFFER:
+ size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
+ cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
+ break;
+ case RESERVE:
+ case RESERVE_10:
+ /*
+ * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
+ * Assume the passthrough or $FABRIC_MOD will tell us about it.
+ */
+ if (cdb[0] == RESERVE_10)
+ size = (cdb[7] << 8) | cdb[8];
+ else
+ size = cmd->data_length;
+
+ /*
+ * Setup the legacy emulated handler for SPC-2 and
+ * >= SPC-3 compatible reservation handling (CRH=1)
+ * Otherwise, we assume the underlying SCSI logic is
+ * is running in SPC_PASSTHROUGH, and wants reservations
+ * emulation disabled.
+ */
+ cmd->transport_emulate_cdb =
+ (T10_RES(su_dev)->res_type !=
+ SPC_PASSTHROUGH) ?
+ &core_scsi2_emulate_crh : NULL;
+ cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
+ break;
+ case RELEASE:
+ case RELEASE_10:
+ /*
+ * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
+ * Assume the passthrough or $FABRIC_MOD will tell us about it.
+ */
+ if (cdb[0] == RELEASE_10)
+ size = (cdb[7] << 8) | cdb[8];
+ else
+ size = cmd->data_length;
+
+ cmd->transport_emulate_cdb =
+ (T10_RES(su_dev)->res_type !=
+ SPC_PASSTHROUGH) ?
+ &core_scsi2_emulate_crh : NULL;
+ cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
+ break;
+ case SYNCHRONIZE_CACHE:
+ case 0x91: /* SYNCHRONIZE_CACHE_16: */
+ /*
+ * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
+ */
+ if (cdb[0] == SYNCHRONIZE_CACHE) {
+ sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
+ T_TASK(cmd)->t_task_lba = transport_lba_32(cdb);
+ } else {
+ sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
+ T_TASK(cmd)->t_task_lba = transport_lba_64(cdb);
+ }
+ if (sector_ret)
+ goto out_unsupported_cdb;
+
+ size = transport_get_size(sectors, cdb, cmd);
+ cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
+
+ /*
+ * For TCM/pSCSI passthrough, skip cmd->transport_emulate_cdb()
+ */
+ if (TRANSPORT(dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
+ break;
+ /*
+ * Set SCF_EMULATE_CDB_ASYNC to ensure asynchronous operation
+ * for SYNCHRONIZE_CACHE* Immed=1 case in __transport_execute_tasks()
+ */
+ cmd->se_cmd_flags |= SCF_EMULATE_CDB_ASYNC;
+ /*
+ * Check to ensure that LBA + Range does not exceed past end of
+ * device.
+ */
+ if (transport_get_sectors(cmd) < 0)
+ goto out_invalid_cdb_field;
+ break;
+ case UNMAP:
+ size = get_unaligned_be16(&cdb[7]);
+ passthrough = (TRANSPORT(dev)->transport_type ==
+ TRANSPORT_PLUGIN_PHBA_PDEV);
+ /*
+ * Determine if the received UNMAP used to for direct passthrough
+ * into Linux/SCSI with struct request via TCM/pSCSI or we are
+ * signaling the use of internal transport_generic_unmap() emulation
+ * for UNMAP -> Linux/BLOCK disbard with TCM/IBLOCK and TCM/FILEIO
+ * subsystem plugin backstores.
+ */
+ if (!(passthrough))
+ cmd->se_cmd_flags |= SCF_EMULATE_SYNC_UNMAP;
+
+ cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
+ break;
+ case WRITE_SAME_16:
+ sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
+ if (sector_ret)
+ goto out_unsupported_cdb;
+ size = transport_get_size(sectors, cdb, cmd);
+ T_TASK(cmd)->t_task_lba = get_unaligned_be16(&cdb[2]);
+ passthrough = (TRANSPORT(dev)->transport_type ==
+ TRANSPORT_PLUGIN_PHBA_PDEV);
+ /*
+ * Determine if the received WRITE_SAME_16 is used to for direct
+ * passthrough into Linux/SCSI with struct request via TCM/pSCSI
+ * or we are signaling the use of internal WRITE_SAME + UNMAP=1
+ * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK and
+ * TCM/FILEIO subsystem plugin backstores.
+ */
+ if (!(passthrough)) {
+ if ((cdb[1] & 0x04) || (cdb[1] & 0x02)) {
+ printk(KERN_ERR "WRITE_SAME PBDATA and LBDATA"
+ " bits not supported for Block Discard"
+ " Emulation\n");
+ goto out_invalid_cdb_field;
+ }
+ /*
+ * Currently for the emulated case we only accept
+ * tpws with the UNMAP=1 bit set.
+ */
+ if (!(cdb[1] & 0x08)) {
+ printk(KERN_ERR "WRITE_SAME w/o UNMAP bit not "
+ " supported for Block Discard Emulation\n");
+ goto out_invalid_cdb_field;
+ }
+ }
+ cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
+ break;
+ case ALLOW_MEDIUM_REMOVAL:
+ case GPCMD_CLOSE_TRACK:
+ case ERASE:
+ case INITIALIZE_ELEMENT_STATUS:
+ case GPCMD_LOAD_UNLOAD:
+ case REZERO_UNIT:
+ case SEEK_10:
+ case GPCMD_SET_SPEED:
+ case SPACE:
+ case START_STOP:
+ case TEST_UNIT_READY:
+ case VERIFY:
+ case WRITE_FILEMARKS:
+ case MOVE_MEDIUM:
+ cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
+ break;
+ case REPORT_LUNS:
+ cmd->transport_emulate_cdb =
+ &transport_core_report_lun_response;
+ size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
+ /*
+ * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
+ * See spc4r17 section 5.3
+ */
+ if (SE_DEV(cmd)->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
+ cmd->sam_task_attr = TASK_ATTR_HOQ;
+ cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
+ break;
+ default:
+ printk(KERN_WARNING "TARGET_CORE[%s]: Unsupported SCSI Opcode"
+ " 0x%02x, sending CHECK_CONDITION.\n",
+ CMD_TFO(cmd)->get_fabric_name(), cdb[0]);
+ cmd->transport_wait_for_tasks = &transport_nop_wait_for_tasks;
+ goto out_unsupported_cdb;
+ }
+
+ if (size != cmd->data_length) {
+ printk(KERN_WARNING "TARGET_CORE[%s]: Expected Transfer Length:"
+ " %u does not match SCSI CDB Length: %u for SAM Opcode:"
+ " 0x%02x\n", CMD_TFO(cmd)->get_fabric_name(),
+ cmd->data_length, size, cdb[0]);
+
+ cmd->cmd_spdtl = size;
+
+ if (cmd->data_direction == DMA_TO_DEVICE) {
+ printk(KERN_ERR "Rejecting underflow/overflow"
+ " WRITE data\n");
+ goto out_invalid_cdb_field;
+ }
+ /*
+ * Reject READ_* or WRITE_* with overflow/underflow for
+ * type SCF_SCSI_DATA_SG_IO_CDB.
+ */
+ if (!(ret) && (DEV_ATTRIB(dev)->block_size != 512)) {
+ printk(KERN_ERR "Failing OVERFLOW/UNDERFLOW for LBA op"
+ " CDB on non 512-byte sector setup subsystem"
+ " plugin: %s\n", TRANSPORT(dev)->name);
+ /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
+ goto out_invalid_cdb_field;
+ }
+
+ 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;
+ }
+
+ transport_set_supported_SAM_opcode(cmd);
+ return ret;
+
+out_unsupported_cdb:
+ cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
+ cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
+ return -2;
+out_invalid_cdb_field:
+ cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
+ cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
+ return -2;
+}
+
+static inline void transport_release_tasks(struct se_cmd *);
+
+/*
+ * This function will copy a contiguous *src buffer into a destination
+ * struct scatterlist array.
+ */
+static void transport_memcpy_write_contig(
+ struct se_cmd *cmd,
+ struct scatterlist *sg_d,
+ unsigned char *src)
+{
+ u32 i = 0, length = 0, total_length = cmd->data_length;
+ void *dst;
+
+ while (total_length) {
+ length = sg_d[i].length;
+
+ if (length > total_length)
+ length = total_length;
+
+ dst = sg_virt(&sg_d[i]);
+
+ memcpy(dst, src, length);
+
+ if (!(total_length -= length))
+ return;
+
+ src += length;
+ i++;
+ }
+}
+
+/*
+ * This function will copy a struct scatterlist array *sg_s into a destination
+ * contiguous *dst buffer.
+ */
+static void transport_memcpy_read_contig(
+ struct se_cmd *cmd,
+ unsigned char *dst,
+ struct scatterlist *sg_s)
+{
+ u32 i = 0, length = 0, total_length = cmd->data_length;
+ void *src;
+
+ while (total_length) {
+ length = sg_s[i].length;
+
+ if (length > total_length)
+ length = total_length;
+
+ src = sg_virt(&sg_s[i]);
+
+ memcpy(dst, src, length);
+
+ if (!(total_length -= length))
+ return;
+
+ dst += length;
+ i++;
+ }
+}
+
+static void transport_memcpy_se_mem_read_contig(
+ struct se_cmd *cmd,
+ unsigned char *dst,
+ struct list_head *se_mem_list)
+{
+ struct se_mem *se_mem;
+ void *src;
+ u32 length = 0, total_length = cmd->data_length;
+
+ list_for_each_entry(se_mem, se_mem_list, se_list) {
+ length = se_mem->se_len;
+
+ if (length > total_length)
+ length = total_length;
+
+ src = page_address(se_mem->se_page) + se_mem->se_off;
+
+ memcpy(dst, src, length);
+
+ if (!(total_length -= length))
+ return;
+
+ dst += length;
+ }
+}
+
+/*
+ * Called from transport_generic_complete_ok() and
+ * transport_generic_request_failure() 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 = SE_DEV(cmd);
+ struct se_cmd *cmd_p, *cmd_tmp;
+ int new_active_tasks = 0;
+
+ if (cmd->sam_task_attr == TASK_ATTR_SIMPLE) {
+ atomic_dec(&dev->simple_cmds);
+ smp_mb__after_atomic_dec();
+ dev->dev_cur_ordered_id++;
+ DEBUG_STA("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 == TASK_ATTR_HOQ) {
+ atomic_dec(&dev->dev_hoq_count);
+ smp_mb__after_atomic_dec();
+ dev->dev_cur_ordered_id++;
+ DEBUG_STA("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 == TASK_ATTR_ORDERED) {
+ spin_lock(&dev->ordered_cmd_lock);
+ list_del(&cmd->se_ordered_list);
+ atomic_dec(&dev->dev_ordered_sync);
+ smp_mb__after_atomic_dec();
+ spin_unlock(&dev->ordered_cmd_lock);
+
+ dev->dev_cur_ordered_id++;
+ DEBUG_STA("Incremented dev_cur_ordered_id: %u for ORDERED:"
+ " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
+ }
+ /*
+ * Process all commands up to the last received
+ * ORDERED task attribute which requires another blocking
+ * boundary
+ */
+ spin_lock(&dev->delayed_cmd_lock);
+ list_for_each_entry_safe(cmd_p, cmd_tmp,
+ &dev->delayed_cmd_list, se_delayed_list) {
+
+ list_del(&cmd_p->se_delayed_list);
+ spin_unlock(&dev->delayed_cmd_lock);
+
+ DEBUG_STA("Calling add_tasks() for"
+ " cmd_p: 0x%02x Task Attr: 0x%02x"
+ " Dormant -> Active, se_ordered_id: %u\n",
+ T_TASK(cmd_p)->t_task_cdb[0],
+ cmd_p->sam_task_attr, cmd_p->se_ordered_id);
+
+ transport_add_tasks_from_cmd(cmd_p);
+ new_active_tasks++;
+
+ spin_lock(&dev->delayed_cmd_lock);
+ if (cmd_p->sam_task_attr == TASK_ATTR_ORDERED)
+ break;
+ }
+ spin_unlock(&dev->delayed_cmd_lock);
+ /*
+ * If new tasks have become active, wake up the transport thread
+ * to do the processing of the Active tasks.
+ */
+ if (new_active_tasks != 0)
+ wake_up_interruptible(&dev->dev_queue_obj->thread_wq);
+}
+
+static void transport_generic_complete_ok(struct se_cmd *cmd)
+{
+ int reason = 0;
+ /*
+ * 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.
+ */
+ if (SE_DEV(cmd)->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
+ transport_complete_task_attr(cmd);
+ /*
+ * Check if we need to retrieve a sense buffer from
+ * the struct se_cmd in question.
+ */
+ if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
+ if (transport_get_sense_data(cmd) < 0)
+ reason = TCM_NON_EXISTENT_LUN;
+
+ /*
+ * Only set when an struct se_task->task_scsi_status returned
+ * a non GOOD status.
+ */
+ if (cmd->scsi_status) {
+ transport_send_check_condition_and_sense(
+ cmd, reason, 1);
+ transport_lun_remove_cmd(cmd);
+ transport_cmd_check_stop_to_fabric(cmd);
+ return;
+ }
+ }
+ /*
+ * Check for a callback, used by amoungst other things
+ * XDWRITE_READ_10 emulation.
+ */
+ if (cmd->transport_complete_callback)
+ cmd->transport_complete_callback(cmd);
+
+ switch (cmd->data_direction) {
+ case DMA_FROM_DEVICE:
+ spin_lock(&cmd->se_lun->lun_sep_lock);
+ if (SE_LUN(cmd)->lun_sep) {
+ SE_LUN(cmd)->lun_sep->sep_stats.tx_data_octets +=
+ cmd->data_length;
+ }
+ spin_unlock(&cmd->se_lun->lun_sep_lock);
+ /*
+ * If enabled by TCM fabirc module pre-registered SGL
+ * memory, perform the memcpy() from the TCM internal
+ * contigious buffer back to the original SGL.
+ */
+ if (cmd->se_cmd_flags & SCF_PASSTHROUGH_CONTIG_TO_SG)
+ transport_memcpy_write_contig(cmd,
+ T_TASK(cmd)->t_task_pt_sgl,
+ T_TASK(cmd)->t_task_buf);
+
+ CMD_TFO(cmd)->queue_data_in(cmd);
+ break;
+ case DMA_TO_DEVICE:
+ spin_lock(&cmd->se_lun->lun_sep_lock);
+ if (SE_LUN(cmd)->lun_sep) {
+ SE_LUN(cmd)->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 (T_TASK(cmd)->t_mem_bidi_list != NULL) {
+ spin_lock(&cmd->se_lun->lun_sep_lock);
+ if (SE_LUN(cmd)->lun_sep) {
+ SE_LUN(cmd)->lun_sep->sep_stats.tx_data_octets +=
+ cmd->data_length;
+ }
+ spin_unlock(&cmd->se_lun->lun_sep_lock);
+ CMD_TFO(cmd)->queue_data_in(cmd);
+ break;
+ }
+ /* Fall through for DMA_TO_DEVICE */
+ case DMA_NONE:
+ CMD_TFO(cmd)->queue_status(cmd);
+ break;
+ default:
+ break;
+ }
+
+ transport_lun_remove_cmd(cmd);
+ transport_cmd_check_stop_to_fabric(cmd);
+}
+
+static void transport_free_dev_tasks(struct se_cmd *cmd)
+{
+ struct se_task *task, *task_tmp;
+ unsigned long flags;
+
+ spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
+ list_for_each_entry_safe(task, task_tmp,
+ &T_TASK(cmd)->t_task_list, t_list) {
+ if (atomic_read(&task->task_active))
+ continue;
+
+ kfree(task->task_sg_bidi);
+ kfree(task->task_sg);
+
+ list_del(&task->t_list);
+
+ spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+ if (task->se_dev)
+ TRANSPORT(task->se_dev)->free_task(task);
+ else
+ printk(KERN_ERR "task[%u] - task->se_dev is NULL\n",
+ task->task_no);
+ spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
+ }
+ spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+}
+
+static inline void transport_free_pages(struct se_cmd *cmd)
+{
+ struct se_mem *se_mem, *se_mem_tmp;
+ int free_page = 1;
+
+ if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
+ free_page = 0;
+ if (cmd->se_dev->transport->do_se_mem_map)
+ free_page = 0;
+
+ if (T_TASK(cmd)->t_task_buf) {
+ kfree(T_TASK(cmd)->t_task_buf);
+ T_TASK(cmd)->t_task_buf = NULL;
+ return;
+ }
+
+ /*
+ * Caller will handle releasing of struct se_mem.
+ */
+ if (cmd->se_cmd_flags & SCF_CMD_PASSTHROUGH_NOALLOC)
+ return;
+
+ if (!(T_TASK(cmd)->t_tasks_se_num))
+ return;
+
+ list_for_each_entry_safe(se_mem, se_mem_tmp,
+ T_TASK(cmd)->t_mem_list, se_list) {
+ /*
+ * We only release call __free_page(struct se_mem->se_page) when
+ * SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC is NOT in use,
+ */
+ if (free_page)
+ __free_page(se_mem->se_page);
+
+ list_del(&se_mem->se_list);
+ kmem_cache_free(se_mem_cache, se_mem);
+ }
+
+ if (T_TASK(cmd)->t_mem_bidi_list && T_TASK(cmd)->t_tasks_se_bidi_num) {
+ list_for_each_entry_safe(se_mem, se_mem_tmp,
+ T_TASK(cmd)->t_mem_bidi_list, se_list) {
+ /*
+ * We only release call __free_page(struct se_mem->se_page) when
+ * SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC is NOT in use,
+ */
+ if (free_page)
+ __free_page(se_mem->se_page);
+
+ list_del(&se_mem->se_list);
+ kmem_cache_free(se_mem_cache, se_mem);
+ }
+ }
+
+ kfree(T_TASK(cmd)->t_mem_bidi_list);
+ T_TASK(cmd)->t_mem_bidi_list = NULL;
+ kfree(T_TASK(cmd)->t_mem_list);
+ T_TASK(cmd)->t_mem_list = NULL;
+ T_TASK(cmd)->t_tasks_se_num = 0;
+}
+
+static inline void transport_release_tasks(struct se_cmd *cmd)
+{
+ transport_free_dev_tasks(cmd);
+}
+
+static inline int transport_dec_and_check(struct se_cmd *cmd)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
+ if (atomic_read(&T_TASK(cmd)->t_fe_count)) {
+ if (!(atomic_dec_and_test(&T_TASK(cmd)->t_fe_count))) {
+ spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock,
+ flags);
+ return 1;
+ }
+ }
+
+ if (atomic_read(&T_TASK(cmd)->t_se_count)) {
+ if (!(atomic_dec_and_test(&T_TASK(cmd)->t_se_count))) {
+ spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock,
+ flags);
+ return 1;
+ }
+ }
+ spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+
+ return 0;
+}
+
+static void transport_release_fe_cmd(struct se_cmd *cmd)
+{
+ unsigned long flags;
+
+ if (transport_dec_and_check(cmd))
+ return;
+
+ spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
+ if (!(atomic_read(&T_TASK(cmd)->transport_dev_active))) {
+ spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+ goto free_pages;
+ }
+ atomic_set(&T_TASK(cmd)->transport_dev_active, 0);
+ transport_all_task_dev_remove_state(cmd);
+ spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+
+ transport_release_tasks(cmd);
+free_pages:
+ transport_free_pages(cmd);
+ transport_free_se_cmd(cmd);
+ CMD_TFO(cmd)->release_cmd_direct(cmd);
+}
+
+static int transport_generic_remove(
+ struct se_cmd *cmd,
+ int release_to_pool,
+ int session_reinstatement)
+{
+ unsigned long flags;
+
+ if (!(T_TASK(cmd)))
+ goto release_cmd;
+
+ if (transport_dec_and_check(cmd)) {
+ if (session_reinstatement) {
+ spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
+ transport_all_task_dev_remove_state(cmd);
+ spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock,
+ flags);
+ }
+ return 1;
+ }
+
+ spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
+ if (!(atomic_read(&T_TASK(cmd)->transport_dev_active))) {
+ spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+ goto free_pages;
+ }
+ atomic_set(&T_TASK(cmd)->transport_dev_active, 0);
+ transport_all_task_dev_remove_state(cmd);
+ spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+
+ transport_release_tasks(cmd);
+free_pages:
+ transport_free_pages(cmd);
+
+release_cmd:
+ if (release_to_pool) {
+ transport_release_cmd_to_pool(cmd);
+ } else {
+ transport_free_se_cmd(cmd);
+ CMD_TFO(cmd)->release_cmd_direct(cmd);
+ }
+
+ return 0;
+}
+
+/*
+ * transport_generic_map_mem_to_cmd - Perform SGL -> struct se_mem map
+ * @cmd: Associated se_cmd descriptor
+ * @mem: SGL style memory for TCM WRITE / READ
+ * @sg_mem_num: Number of SGL elements
+ * @mem_bidi_in: SGL style memory for TCM BIDI READ
+ * @sg_mem_bidi_num: Number of BIDI READ SGL elements
+ *
+ * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
+ * of parameters.
+ */
+int transport_generic_map_mem_to_cmd(
+ struct se_cmd *cmd,
+ struct scatterlist *mem,
+ u32 sg_mem_num,
+ struct scatterlist *mem_bidi_in,
+ u32 sg_mem_bidi_num)
+{
+ u32 se_mem_cnt_out = 0;
+ int ret;
+
+ if (!(mem) || !(sg_mem_num))
+ return 0;
+ /*
+ * Passed *mem will contain a list_head containing preformatted
+ * struct se_mem elements...
+ */
+ if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM)) {
+ if ((mem_bidi_in) || (sg_mem_bidi_num)) {
+ printk(KERN_ERR "SCF_CMD_PASSTHROUGH_NOALLOC not supported"
+ " with BIDI-COMMAND\n");
+ return -ENOSYS;
+ }
+
+ T_TASK(cmd)->t_mem_list = (struct list_head *)mem;
+ T_TASK(cmd)->t_tasks_se_num = sg_mem_num;
+ cmd->se_cmd_flags |= SCF_CMD_PASSTHROUGH_NOALLOC;
+ return 0;
+ }
+ /*
+ * Otherwise, assume the caller is passing a struct scatterlist
+ * array from include/linux/scatterlist.h
+ */
+ if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
+ (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) {
+ /*
+ * For CDB using TCM struct se_mem linked list scatterlist memory
+ * processed into a TCM struct se_subsystem_dev, we do the mapping
+ * from the passed physical memory to struct se_mem->se_page here.
+ */
+ T_TASK(cmd)->t_mem_list = transport_init_se_mem_list();
+ if (!(T_TASK(cmd)->t_mem_list))
+ return -ENOMEM;
+
+ ret = transport_map_sg_to_mem(cmd,
+ T_TASK(cmd)->t_mem_list, mem, &se_mem_cnt_out);
+ if (ret < 0)
+ return -ENOMEM;
+
+ T_TASK(cmd)->t_tasks_se_num = se_mem_cnt_out;
+ /*
+ * Setup BIDI READ list of struct se_mem elements
+ */
+ if ((mem_bidi_in) && (sg_mem_bidi_num)) {
+ T_TASK(cmd)->t_mem_bidi_list = transport_init_se_mem_list();
+ if (!(T_TASK(cmd)->t_mem_bidi_list)) {
+ kfree(T_TASK(cmd)->t_mem_list);
+ return -ENOMEM;
+ }
+ se_mem_cnt_out = 0;
+
+ ret = transport_map_sg_to_mem(cmd,
+ T_TASK(cmd)->t_mem_bidi_list, mem_bidi_in,
+ &se_mem_cnt_out);
+ if (ret < 0) {
+ kfree(T_TASK(cmd)->t_mem_list);
+ return -ENOMEM;
+ }
+
+ T_TASK(cmd)->t_tasks_se_bidi_num = se_mem_cnt_out;
+ }
+ cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
+
+ } else if (cmd->se_cmd_flags & SCF_SCSI_CONTROL_NONSG_IO_CDB) {
+ if (mem_bidi_in || sg_mem_bidi_num) {
+ printk(KERN_ERR "BIDI-Commands not supported using "
+ "SCF_SCSI_CONTROL_NONSG_IO_CDB\n");
+ return -ENOSYS;
+ }
+ /*
+ * For incoming CDBs using a contiguous buffer internall with TCM,
+ * save the passed struct scatterlist memory. After TCM storage object
+ * processing has completed for this struct se_cmd, TCM core will call
+ * transport_memcpy_[write,read]_contig() as necessary from
+ * transport_generic_complete_ok() and transport_write_pending() in order
+ * to copy the TCM buffer to/from the original passed *mem in SGL ->
+ * struct scatterlist format.
+ */
+ cmd->se_cmd_flags |= SCF_PASSTHROUGH_CONTIG_TO_SG;
+ T_TASK(cmd)->t_task_pt_sgl = mem;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
+
+
+static inline long long transport_dev_end_lba(struct se_device *dev)
+{
+ return dev->transport->get_blocks(dev) + 1;
+}
+
+static int transport_get_sectors(struct se_cmd *cmd)
+{
+ struct se_device *dev = SE_DEV(cmd);
+
+ T_TASK(cmd)->t_tasks_sectors =
+ (cmd->data_length / DEV_ATTRIB(dev)->block_size);
+ if (!(T_TASK(cmd)->t_tasks_sectors))
+ T_TASK(cmd)->t_tasks_sectors = 1;
+
+ if (TRANSPORT(dev)->get_device_type(dev) != TYPE_DISK)
+ return 0;
+
+ if ((T_TASK(cmd)->t_task_lba + T_TASK(cmd)->t_tasks_sectors) >
+ transport_dev_end_lba(dev)) {
+ printk(KERN_ERR "LBA: %llu Sectors: %u exceeds"
+ " transport_dev_end_lba(): %llu\n",
+ T_TASK(cmd)->t_task_lba, T_TASK(cmd)->t_tasks_sectors,
+ transport_dev_end_lba(dev));
+ cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
+ cmd->scsi_sense_reason = TCM_SECTOR_COUNT_TOO_MANY;
+ return PYX_TRANSPORT_REQ_TOO_MANY_SECTORS;
+ }
+
+ return 0;
+}
+
+static int transport_new_cmd_obj(struct se_cmd *cmd)
+{
+ struct se_device *dev = SE_DEV(cmd);
+ u32 task_cdbs = 0, rc;
+
+ if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)) {
+ task_cdbs++;
+ T_TASK(cmd)->t_task_cdbs++;
+ } else {
+ int set_counts = 1;
+
+ /*
+ * Setup any BIDI READ tasks and memory from
+ * T_TASK(cmd)->t_mem_bidi_list so the READ struct se_tasks
+ * are queued first for the non pSCSI passthrough case.
+ */
+ if ((T_TASK(cmd)->t_mem_bidi_list != NULL) &&
+ (TRANSPORT(dev)->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV)) {
+ rc = transport_generic_get_cdb_count(cmd,
+ T_TASK(cmd)->t_task_lba,
+ T_TASK(cmd)->t_tasks_sectors,
+ DMA_FROM_DEVICE, T_TASK(cmd)->t_mem_bidi_list,
+ set_counts);
+ if (!(rc)) {
+ cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
+ cmd->scsi_sense_reason =
+ TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
+ return PYX_TRANSPORT_LU_COMM_FAILURE;
+ }
+ set_counts = 0;
+ }
+ /*
+ * Setup the tasks and memory from T_TASK(cmd)->t_mem_list
+ * Note for BIDI transfers this will contain the WRITE payload
+ */
+ task_cdbs = transport_generic_get_cdb_count(cmd,
+ T_TASK(cmd)->t_task_lba,
+ T_TASK(cmd)->t_tasks_sectors,
+ cmd->data_direction, T_TASK(cmd)->t_mem_list,
+ set_counts);
+ if (!(task_cdbs)) {
+ cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
+ cmd->scsi_sense_reason =
+ TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
+ return PYX_TRANSPORT_LU_COMM_FAILURE;
+ }
+ T_TASK(cmd)->t_task_cdbs += task_cdbs;
+
+#if 0
+ printk(KERN_INFO "data_length: %u, LBA: %llu t_tasks_sectors:"
+ " %u, t_task_cdbs: %u\n", obj_ptr, cmd->data_length,
+ T_TASK(cmd)->t_task_lba, T_TASK(cmd)->t_tasks_sectors,
+ T_TASK(cmd)->t_task_cdbs);
+#endif
+ }
+
+ atomic_set(&T_TASK(cmd)->t_task_cdbs_left, task_cdbs);
+ atomic_set(&T_TASK(cmd)->t_task_cdbs_ex_left, task_cdbs);
+ atomic_set(&T_TASK(cmd)->t_task_cdbs_timeout_left, task_cdbs);
+ return 0;
+}
+
+static struct list_head *transport_init_se_mem_list(void)
+{
+ struct list_head *se_mem_list;
+
+ se_mem_list = kzalloc(sizeof(struct list_head), GFP_KERNEL);
+ if (!(se_mem_list)) {
+ printk(KERN_ERR "Unable to allocate memory for se_mem_list\n");
+ return NULL;
+ }
+ INIT_LIST_HEAD(se_mem_list);
+
+ return se_mem_list;
+}
+
+static int
+transport_generic_get_mem(struct se_cmd *cmd, u32 length, u32 dma_size)
+{
+ unsigned char *buf;
+ struct se_mem *se_mem;
+
+ T_TASK(cmd)->t_mem_list = transport_init_se_mem_list();
+ if (!(T_TASK(cmd)->t_mem_list))
+ return -ENOMEM;
+
+ /*
+ * If the device uses memory mapping this is enough.
+ */
+ if (cmd->se_dev->transport->do_se_mem_map)
+ return 0;
+
+ /*
+ * Setup BIDI-COMMAND READ list of struct se_mem elements
+ */
+ if (T_TASK(cmd)->t_tasks_bidi) {
+ T_TASK(cmd)->t_mem_bidi_list = transport_init_se_mem_list();
+ if (!(T_TASK(cmd)->t_mem_bidi_list)) {
+ kfree(T_TASK(cmd)->t_mem_list);
+ return -ENOMEM;
+ }
+ }
+
+ while (length) {
+ se_mem = kmem_cache_zalloc(se_mem_cache, GFP_KERNEL);
+ if (!(se_mem)) {
+ printk(KERN_ERR "Unable to allocate struct se_mem\n");
+ goto out;
+ }
+ INIT_LIST_HEAD(&se_mem->se_list);
+ se_mem->se_len = (length > dma_size) ? dma_size : length;
+
+/* #warning FIXME Allocate contigous pages for struct se_mem elements */
+ se_mem->se_page = (struct page *) alloc_pages(GFP_KERNEL, 0);
+ if (!(se_mem->se_page)) {
+ printk(KERN_ERR "alloc_pages() failed\n");
+ goto out;
+ }
+
+ buf = kmap_atomic(se_mem->se_page, KM_IRQ0);
+ if (!(buf)) {
+ printk(KERN_ERR "kmap_atomic() failed\n");
+ goto out;
+ }
+ memset(buf, 0, se_mem->se_len);
+ kunmap_atomic(buf, KM_IRQ0);
+
+ list_add_tail(&se_mem->se_list, T_TASK(cmd)->t_mem_list);
+ T_TASK(cmd)->t_tasks_se_num++;
+
+ DEBUG_MEM("Allocated struct se_mem page(%p) Length(%u)"
+ " Offset(%u)\n", se_mem->se_page, se_mem->se_len,
+ se_mem->se_off);
+
+ length -= se_mem->se_len;
+ }
+
+ DEBUG_MEM("Allocated total struct se_mem elements(%u)\n",
+ T_TASK(cmd)->t_tasks_se_num);
+
+ return 0;
+out:
+ return -1;
+}
+
+extern u32 transport_calc_sg_num(
+ struct se_task *task,
+ struct se_mem *in_se_mem,
+ u32 task_offset)
+{
+ struct se_cmd *se_cmd = task->task_se_cmd;
+ struct se_device *se_dev = SE_DEV(se_cmd);
+ struct se_mem *se_mem = in_se_mem;
+ struct target_core_fabric_ops *tfo = CMD_TFO(se_cmd);
+ u32 sg_length, task_size = task->task_size, task_sg_num_padded;
+
+ while (task_size != 0) {
+ DEBUG_SC("se_mem->se_page(%p) se_mem->se_len(%u)"
+ " se_mem->se_off(%u) task_offset(%u)\n",
+ se_mem->se_page, se_mem->se_len,
+ se_mem->se_off, task_offset);
+
+ if (task_offset == 0) {
+ if (task_size >= se_mem->se_len) {
+ sg_length = se_mem->se_len;
+
+ if (!(list_is_last(&se_mem->se_list,
+ T_TASK(se_cmd)->t_mem_list)))
+ se_mem = list_entry(se_mem->se_list.next,
+ struct se_mem, se_list);
+ } else {
+ sg_length = task_size;
+ task_size -= sg_length;
+ goto next;
+ }
+
+ DEBUG_SC("sg_length(%u) task_size(%u)\n",
+ sg_length, task_size);
+ } else {
+ if ((se_mem->se_len - task_offset) > task_size) {
+ sg_length = task_size;
+ task_size -= sg_length;
+ goto next;
+ } else {
+ sg_length = (se_mem->se_len - task_offset);
+
+ if (!(list_is_last(&se_mem->se_list,
+ T_TASK(se_cmd)->t_mem_list)))
+ se_mem = list_entry(se_mem->se_list.next,
+ struct se_mem, se_list);
+ }
+
+ DEBUG_SC("sg_length(%u) task_size(%u)\n",
+ sg_length, task_size);
+
+ task_offset = 0;
+ }
+ task_size -= sg_length;
+next:
+ DEBUG_SC("task[%u] - Reducing task_size to(%u)\n",
+ task->task_no, task_size);
+
+ task->task_sg_num++;
+ }
+ /*
+ * Check if the fabric module driver is requesting that all
+ * struct se_task->task_sg[] be chained together.. If so,
+ * then allocate an extra padding SG entry for linking and
+ * marking the end of the chained SGL.
+ */
+ if (tfo->task_sg_chaining) {
+ task_sg_num_padded = (task->task_sg_num + 1);
+ task->task_padded_sg = 1;
+ } else
+ task_sg_num_padded = task->task_sg_num;
+
+ task->task_sg = kzalloc(task_sg_num_padded *
+ sizeof(struct scatterlist), GFP_KERNEL);
+ if (!(task->task_sg)) {
+ printk(KERN_ERR "Unable to allocate memory for"
+ " task->task_sg\n");
+ return 0;
+ }
+ sg_init_table(&task->task_sg[0], task_sg_num_padded);
+ /*
+ * Setup task->task_sg_bidi for SCSI READ payload for
+ * TCM/pSCSI passthrough if present for BIDI-COMMAND
+ */
+ if ((T_TASK(se_cmd)->t_mem_bidi_list != NULL) &&
+ (TRANSPORT(se_dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)) {
+ task->task_sg_bidi = kzalloc(task_sg_num_padded *
+ sizeof(struct scatterlist), GFP_KERNEL);
+ if (!(task->task_sg_bidi)) {
+ printk(KERN_ERR "Unable to allocate memory for"
+ " task->task_sg_bidi\n");
+ return 0;
+ }
+ sg_init_table(&task->task_sg_bidi[0], task_sg_num_padded);
+ }
+ /*
+ * For the chaining case, setup the proper end of SGL for the
+ * initial submission struct task into struct se_subsystem_api.
+ * This will be cleared later by transport_do_task_sg_chain()
+ */
+ if (task->task_padded_sg) {
+ sg_mark_end(&task->task_sg[task->task_sg_num - 1]);
+ /*
+ * Added the 'if' check before marking end of bi-directional
+ * scatterlist (which gets created only in case of request
+ * (RD + WR).
+ */
+ if (task->task_sg_bidi)
+ sg_mark_end(&task->task_sg_bidi[task->task_sg_num - 1]);
+ }
+
+ DEBUG_SC("Successfully allocated task->task_sg_num(%u),"
+ " task_sg_num_padded(%u)\n", task->task_sg_num,
+ task_sg_num_padded);
+
+ return task->task_sg_num;
+}
+
+static inline int transport_set_tasks_sectors_disk(
+ struct se_task *task,
+ struct se_device *dev,
+ unsigned long long lba,
+ u32 sectors,
+ int *max_sectors_set)
+{
+ if ((lba + sectors) > transport_dev_end_lba(dev)) {
+ task->task_sectors = ((transport_dev_end_lba(dev) - lba) + 1);
+
+ if (task->task_sectors > DEV_ATTRIB(dev)->max_sectors) {
+ task->task_sectors = DEV_ATTRIB(dev)->max_sectors;
+ *max_sectors_set = 1;
+ }
+ } else {
+ if (sectors > DEV_ATTRIB(dev)->max_sectors) {
+ task->task_sectors = DEV_ATTRIB(dev)->max_sectors;
+ *max_sectors_set = 1;
+ } else
+ task->task_sectors = sectors;
+ }
+
+ return 0;
+}
+
+static inline int transport_set_tasks_sectors_non_disk(
+ struct se_task *task,
+ struct se_device *dev,
+ unsigned long long lba,
+ u32 sectors,
+ int *max_sectors_set)
+{
+ if (sectors > DEV_ATTRIB(dev)->max_sectors) {
+ task->task_sectors = DEV_ATTRIB(dev)->max_sectors;
+ *max_sectors_set = 1;
+ } else
+ task->task_sectors = sectors;
+
+ return 0;
+}
+
+static inline int transport_set_tasks_sectors(
+ struct se_task *task,
+ struct se_device *dev,
+ unsigned long long lba,
+ u32 sectors,
+ int *max_sectors_set)
+{
+ return (TRANSPORT(dev)->get_device_type(dev) == TYPE_DISK) ?
+ transport_set_tasks_sectors_disk(task, dev, lba, sectors,
+ max_sectors_set) :
+ transport_set_tasks_sectors_non_disk(task, dev, lba, sectors,
+ max_sectors_set);
+}
+
+static int transport_map_sg_to_mem(
+ struct se_cmd *cmd,
+ struct list_head *se_mem_list,
+ void *in_mem,
+ u32 *se_mem_cnt)
+{
+ struct se_mem *se_mem;
+ struct scatterlist *sg;
+ u32 sg_count = 1, cmd_size = cmd->data_length;
+
+ if (!in_mem) {
+ printk(KERN_ERR "No source scatterlist\n");
+ return -1;
+ }
+ sg = (struct scatterlist *)in_mem;
+
+ while (cmd_size) {
+ se_mem = kmem_cache_zalloc(se_mem_cache, GFP_KERNEL);
+ if (!(se_mem)) {
+ printk(KERN_ERR "Unable to allocate struct se_mem\n");
+ return -1;
+ }
+ INIT_LIST_HEAD(&se_mem->se_list);
+ DEBUG_MEM("sg_to_mem: Starting loop with cmd_size: %u"
+ " sg_page: %p offset: %d length: %d\n", cmd_size,
+ sg_page(sg), sg->offset, sg->length);
+
+ se_mem->se_page = sg_page(sg);
+ se_mem->se_off = sg->offset;
+
+ if (cmd_size > sg->length) {
+ se_mem->se_len = sg->length;
+ sg = sg_next(sg);
+ sg_count++;
+ } else
+ se_mem->se_len = cmd_size;
+
+ cmd_size -= se_mem->se_len;
+
+ DEBUG_MEM("sg_to_mem: *se_mem_cnt: %u cmd_size: %u\n",
+ *se_mem_cnt, cmd_size);
+ DEBUG_MEM("sg_to_mem: Final se_page: %p se_off: %d se_len: %d\n",
+ se_mem->se_page, se_mem->se_off, se_mem->se_len);
+
+ list_add_tail(&se_mem->se_list, se_mem_list);
+ (*se_mem_cnt)++;
+ }
+
+ DEBUG_MEM("task[0] - Mapped(%u) struct scatterlist segments to(%u)"
+ " struct se_mem\n", sg_count, *se_mem_cnt);
+
+ if (sg_count != *se_mem_cnt)
+ BUG();
+
+ return 0;
+}
+
+/* transport_map_mem_to_sg():
+ *
+ *
+ */
+int transport_map_mem_to_sg(
+ struct se_task *task,
+ struct list_head *se_mem_list,
+ void *in_mem,
+ struct se_mem *in_se_mem,
+ struct se_mem **out_se_mem,
+ u32 *se_mem_cnt,
+ u32 *task_offset)
+{
+ struct se_cmd *se_cmd = task->task_se_cmd;
+ struct se_mem *se_mem = in_se_mem;
+ struct scatterlist *sg = (struct scatterlist *)in_mem;
+ u32 task_size = task->task_size, sg_no = 0;
+
+ if (!sg) {
+ printk(KERN_ERR "Unable to locate valid struct"
+ " scatterlist pointer\n");
+ return -1;
+ }
+
+ while (task_size != 0) {
+ /*
+ * Setup the contigious array of scatterlists for
+ * this struct se_task.
+ */
+ sg_assign_page(sg, se_mem->se_page);
+
+ if (*task_offset == 0) {
+ sg->offset = se_mem->se_off;
+
+ if (task_size >= se_mem->se_len) {
+ sg->length = se_mem->se_len;
+
+ if (!(list_is_last(&se_mem->se_list,
+ T_TASK(se_cmd)->t_mem_list))) {
+ se_mem = list_entry(se_mem->se_list.next,
+ struct se_mem, se_list);
+ (*se_mem_cnt)++;
+ }
+ } else {
+ sg->length = task_size;
+ /*
+ * Determine if we need to calculate an offset
+ * into the struct se_mem on the next go around..
+ */
+ task_size -= sg->length;
+ if (!(task_size))
+ *task_offset = sg->length;
+
+ goto next;
+ }
+
+ } else {
+ sg->offset = (*task_offset + se_mem->se_off);
+
+ if ((se_mem->se_len - *task_offset) > task_size) {
+ sg->length = task_size;
+ /*
+ * Determine if we need to calculate an offset
+ * into the struct se_mem on the next go around..
+ */
+ task_size -= sg->length;
+ if (!(task_size))
+ *task_offset += sg->length;
+
+ goto next;
+ } else {
+ sg->length = (se_mem->se_len - *task_offset);
+
+ if (!(list_is_last(&se_mem->se_list,
+ T_TASK(se_cmd)->t_mem_list))) {
+ se_mem = list_entry(se_mem->se_list.next,
+ struct se_mem, se_list);
+ (*se_mem_cnt)++;
+ }
+ }
+
+ *task_offset = 0;
+ }
+ task_size -= sg->length;
+next:
+ DEBUG_MEM("task[%u] mem_to_sg - sg[%u](%p)(%u)(%u) - Reducing"
+ " task_size to(%u), task_offset: %u\n", task->task_no, sg_no,
+ sg_page(sg), sg->length, sg->offset, task_size, *task_offset);
+
+ sg_no++;
+ if (!(task_size))
+ break;
+
+ sg = sg_next(sg);
+
+ if (task_size > se_cmd->data_length)
+ BUG();
+ }
+ *out_se_mem = se_mem;
+
+ DEBUG_MEM("task[%u] - Mapped(%u) struct se_mem segments to total(%u)"
+ " SGs\n", task->task_no, *se_mem_cnt, sg_no);
+
+ return 0;
+}
+
+/*
+ * This function can be used by HW target mode drivers to create a linked
+ * scatterlist from all contiguously allocated struct se_task->task_sg[].
+ * This is intended to be called during the completion path by TCM Core
+ * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
+ */
+void transport_do_task_sg_chain(struct se_cmd *cmd)
+{
+ struct scatterlist *sg_head = NULL, *sg_link = NULL, *sg_first = NULL;
+ struct scatterlist *sg_head_cur = NULL, *sg_link_cur = NULL;
+ struct scatterlist *sg, *sg_end = NULL, *sg_end_cur = NULL;
+ struct se_task *task;
+ struct target_core_fabric_ops *tfo = CMD_TFO(cmd);
+ u32 task_sg_num = 0, sg_count = 0;
+ int i;
+
+ if (tfo->task_sg_chaining == 0) {
+ printk(KERN_ERR "task_sg_chaining is diabled for fabric module:"
+ " %s\n", tfo->get_fabric_name());
+ dump_stack();
+ return;
+ }
+ /*
+ * Walk the struct se_task list and setup scatterlist chains
+ * for each contiguosly allocated struct se_task->task_sg[].
+ */
+ list_for_each_entry(task, &T_TASK(cmd)->t_task_list, t_list) {
+ if (!(task->task_sg) || !(task->task_padded_sg))
+ continue;
+
+ if (sg_head && sg_link) {
+ sg_head_cur = &task->task_sg[0];
+ sg_link_cur = &task->task_sg[task->task_sg_num];
+ /*
+ * Either add chain or mark end of scatterlist
+ */
+ if (!(list_is_last(&task->t_list,
+ &T_TASK(cmd)->t_task_list))) {
+ /*
+ * Clear existing SGL termination bit set in
+ * transport_calc_sg_num(), see sg_mark_end()
+ */
+ sg_end_cur = &task->task_sg[task->task_sg_num - 1];
+ sg_end_cur->page_link &= ~0x02;
+
+ sg_chain(sg_head, task_sg_num, sg_head_cur);
+ sg_count += (task->task_sg_num + 1);
+ } else
+ sg_count += task->task_sg_num;
+
+ sg_head = sg_head_cur;
+ sg_link = sg_link_cur;
+ task_sg_num = task->task_sg_num;
+ continue;
+ }
+ sg_head = sg_first = &task->task_sg[0];
+ sg_link = &task->task_sg[task->task_sg_num];
+ task_sg_num = task->task_sg_num;
+ /*
+ * Check for single task..
+ */
+ if (!(list_is_last(&task->t_list, &T_TASK(cmd)->t_task_list))) {
+ /*
+ * Clear existing SGL termination bit set in
+ * transport_calc_sg_num(), see sg_mark_end()
+ */
+ sg_end = &task->task_sg[task->task_sg_num - 1];
+ sg_end->page_link &= ~0x02;
+ sg_count += (task->task_sg_num + 1);
+ } else
+ sg_count += task->task_sg_num;
+ }
+ /*
+ * Setup the starting pointer and total t_tasks_sg_linked_no including
+ * padding SGs for linking and to mark the end.
+ */
+ T_TASK(cmd)->t_tasks_sg_chained = sg_first;
+ T_TASK(cmd)->t_tasks_sg_chained_no = sg_count;
+
+ DEBUG_CMD_M("Setup T_TASK(cmd)->t_tasks_sg_chained: %p and"
+ " t_tasks_sg_chained_no: %u\n", T_TASK(cmd)->t_tasks_sg_chained,
+ T_TASK(cmd)->t_tasks_sg_chained_no);
+
+ for_each_sg(T_TASK(cmd)->t_tasks_sg_chained, sg,
+ T_TASK(cmd)->t_tasks_sg_chained_no, i) {
+
+ DEBUG_CMD_M("SG: %p page: %p length: %d offset: %d\n",
+ sg, sg_page(sg), sg->length, sg->offset);
+ if (sg_is_chain(sg))
+ DEBUG_CMD_M("SG: %p sg_is_chain=1\n", sg);
+ if (sg_is_last(sg))
+ DEBUG_CMD_M("SG: %p sg_is_last=1\n", sg);
+ }
+
+}
+EXPORT_SYMBOL(transport_do_task_sg_chain);
+
+static int transport_do_se_mem_map(
+ struct se_device *dev,
+ struct se_task *task,
+ struct list_head *se_mem_list,
+ void *in_mem,
+ struct se_mem *in_se_mem,
+ struct se_mem **out_se_mem,
+ u32 *se_mem_cnt,
+ u32 *task_offset_in)
+{
+ u32 task_offset = *task_offset_in;
+ int ret = 0;
+ /*
+ * se_subsystem_api_t->do_se_mem_map is used when internal allocation
+ * has been done by the transport plugin.
+ */
+ if (TRANSPORT(dev)->do_se_mem_map) {
+ ret = TRANSPORT(dev)->do_se_mem_map(task, se_mem_list,
+ in_mem, in_se_mem, out_se_mem, se_mem_cnt,
+ task_offset_in);
+ if (ret == 0)
+ T_TASK(task->task_se_cmd)->t_tasks_se_num += *se_mem_cnt;
+
+ return ret;
+ }
+ /*
+ * This is the normal path for all normal non BIDI and BIDI-COMMAND
+ * WRITE payloads.. If we need to do BIDI READ passthrough for
+ * TCM/pSCSI the first call to transport_do_se_mem_map ->
+ * transport_calc_sg_num() -> transport_map_mem_to_sg() will do the
+ * allocation for task->task_sg_bidi, and the subsequent call to
+ * transport_do_se_mem_map() from transport_generic_get_cdb_count()
+ */
+ if (!(task->task_sg_bidi)) {
+ /*
+ * Assume default that transport plugin speaks preallocated
+ * scatterlists.
+ */
+ if (!(transport_calc_sg_num(task, in_se_mem, task_offset)))
+ return -1;
+ /*
+ * struct se_task->task_sg now contains the struct scatterlist array.
+ */
+ return transport_map_mem_to_sg(task, se_mem_list, task->task_sg,
+ in_se_mem, out_se_mem, se_mem_cnt,
+ task_offset_in);
+ }
+ /*
+ * Handle the se_mem_list -> struct task->task_sg_bidi
+ * memory map for the extra BIDI READ payload
+ */
+ return transport_map_mem_to_sg(task, se_mem_list, task->task_sg_bidi,
+ in_se_mem, out_se_mem, se_mem_cnt,
+ task_offset_in);
+}
+
+static u32 transport_generic_get_cdb_count(
+ struct se_cmd *cmd,
+ unsigned long long lba,
+ u32 sectors,
+ enum dma_data_direction data_direction,
+ struct list_head *mem_list,
+ int set_counts)
+{
+ unsigned char *cdb = NULL;
+ struct se_task *task;
+ struct se_mem *se_mem = NULL, *se_mem_lout = NULL;
+ struct se_mem *se_mem_bidi = NULL, *se_mem_bidi_lout = NULL;
+ struct se_device *dev = SE_DEV(cmd);
+ int max_sectors_set = 0, ret;
+ u32 task_offset_in = 0, se_mem_cnt = 0, se_mem_bidi_cnt = 0, task_cdbs = 0;
+
+ if (!mem_list) {
+ printk(KERN_ERR "mem_list is NULL in transport_generic_get"
+ "_cdb_count()\n");
+ return 0;
+ }
+ /*
+ * While using RAMDISK_DR backstores is the only case where
+ * mem_list will ever be empty at this point.
+ */
+ if (!(list_empty(mem_list)))
+ se_mem = list_entry(mem_list->next, struct se_mem, se_list);
+ /*
+ * Check for extra se_mem_bidi mapping for BIDI-COMMANDs to
+ * struct se_task->task_sg_bidi for TCM/pSCSI passthrough operation
+ */
+ if ((T_TASK(cmd)->t_mem_bidi_list != NULL) &&
+ !(list_empty(T_TASK(cmd)->t_mem_bidi_list)) &&
+ (TRANSPORT(dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV))
+ se_mem_bidi = list_entry(T_TASK(cmd)->t_mem_bidi_list->next,
+ struct se_mem, se_list);
+
+ while (sectors) {
+ DEBUG_VOL("ITT[0x%08x] LBA(%llu) SectorsLeft(%u) EOBJ(%llu)\n",
+ CMD_TFO(cmd)->get_task_tag(cmd), lba, sectors,
+ transport_dev_end_lba(dev));
+
+ task = transport_generic_get_task(cmd, data_direction);
+ if (!(task))
+ goto out;
+
+ transport_set_tasks_sectors(task, dev, lba, sectors,
+ &max_sectors_set);
+
+ task->task_lba = lba;
+ lba += task->task_sectors;
+ sectors -= task->task_sectors;
+ task->task_size = (task->task_sectors *
+ DEV_ATTRIB(dev)->block_size);
+
+ cdb = TRANSPORT(dev)->get_cdb(task);
+ if ((cdb)) {
+ memcpy(cdb, T_TASK(cmd)->t_task_cdb,
+ scsi_command_size(T_TASK(cmd)->t_task_cdb));
+ cmd->transport_split_cdb(task->task_lba,
+ &task->task_sectors, cdb);
+ }
+
+ /*
+ * Perform the SE OBJ plugin and/or Transport plugin specific
+ * mapping for T_TASK(cmd)->t_mem_list. And setup the
+ * task->task_sg and if necessary task->task_sg_bidi
+ */
+ ret = transport_do_se_mem_map(dev, task, mem_list,
+ NULL, se_mem, &se_mem_lout, &se_mem_cnt,
+ &task_offset_in);
+ if (ret < 0)
+ goto out;
+
+ se_mem = se_mem_lout;
+ /*
+ * Setup the T_TASK(cmd)->t_mem_bidi_list -> task->task_sg_bidi
+ * mapping for SCSI READ for BIDI-COMMAND passthrough with TCM/pSCSI
+ *
+ * Note that the first call to transport_do_se_mem_map() above will
+ * allocate struct se_task->task_sg_bidi in transport_do_se_mem_map()
+ * -> transport_calc_sg_num(), and the second here will do the
+ * mapping for SCSI READ for BIDI-COMMAND passthrough with TCM/pSCSI.
+ */
+ if (task->task_sg_bidi != NULL) {
+ ret = transport_do_se_mem_map(dev, task,
+ T_TASK(cmd)->t_mem_bidi_list, NULL,
+ se_mem_bidi, &se_mem_bidi_lout, &se_mem_bidi_cnt,
+ &task_offset_in);
+ if (ret < 0)
+ goto out;
+
+ se_mem_bidi = se_mem_bidi_lout;
+ }
+ task_cdbs++;
+
+ DEBUG_VOL("Incremented task_cdbs(%u) task->task_sg_num(%u)\n",
+ task_cdbs, task->task_sg_num);
+
+ if (max_sectors_set) {
+ max_sectors_set = 0;
+ continue;
+ }
+
+ if (!sectors)
+ break;
+ }
+
+ if (set_counts) {
+ atomic_inc(&T_TASK(cmd)->t_fe_count);
+ atomic_inc(&T_TASK(cmd)->t_se_count);
+ }
+
+ DEBUG_VOL("ITT[0x%08x] total %s cdbs(%u)\n",
+ CMD_TFO(cmd)->get_task_tag(cmd), (data_direction == DMA_TO_DEVICE)
+ ? "DMA_TO_DEVICE" : "DMA_FROM_DEVICE", task_cdbs);
+
+ return task_cdbs;
+out:
+ return 0;
+}
+
+static int
+transport_map_control_cmd_to_task(struct se_cmd *cmd)
+{
+ struct se_device *dev = SE_DEV(cmd);
+ unsigned char *cdb;
+ struct se_task *task;
+ int ret;
+
+ task = transport_generic_get_task(cmd, cmd->data_direction);
+ if (!task)
+ return PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES;
+
+ cdb = TRANSPORT(dev)->get_cdb(task);
+ if (cdb)
+ memcpy(cdb, cmd->t_task->t_task_cdb,
+ scsi_command_size(cmd->t_task->t_task_cdb));
+
+ task->task_size = cmd->data_length;
+ task->task_sg_num =
+ (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) ? 1 : 0;
+
+ atomic_inc(&cmd->t_task->t_fe_count);
+ atomic_inc(&cmd->t_task->t_se_count);
+
+ if (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) {
+ struct se_mem *se_mem = NULL, *se_mem_lout = NULL;
+ u32 se_mem_cnt = 0, task_offset = 0;
+
+ BUG_ON(list_empty(cmd->t_task->t_mem_list));
+
+ ret = transport_do_se_mem_map(dev, task,
+ cmd->t_task->t_mem_list, NULL, se_mem,
+ &se_mem_lout, &se_mem_cnt, &task_offset);
+ if (ret < 0)
+ return PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES;
+
+ if (dev->transport->map_task_SG)
+ return dev->transport->map_task_SG(task);
+ return 0;
+ } else if (cmd->se_cmd_flags & SCF_SCSI_CONTROL_NONSG_IO_CDB) {
+ if (dev->transport->map_task_non_SG)
+ return dev->transport->map_task_non_SG(task);
+ return 0;
+ } else if (cmd->se_cmd_flags & SCF_SCSI_NON_DATA_CDB) {
+ if (dev->transport->cdb_none)
+ return dev->transport->cdb_none(task);
+ return 0;
+ } else {
+ BUG();
+ return PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES;
+ }
+}
+
+/* transport_generic_new_cmd(): Called from transport_processing_thread()
+ *
+ * Allocate storage transport resources from a set of values predefined
+ * by transport_generic_cmd_sequencer() from the iSCSI Target RX process.
+ * Any non zero return here is treated as an "out of resource' op here.
+ */
+ /*
+ * Generate struct se_task(s) and/or their payloads for this CDB.
+ */
+static int transport_generic_new_cmd(struct se_cmd *cmd)
+{
+ struct se_portal_group *se_tpg;
+ struct se_task *task;
+ struct se_device *dev = SE_DEV(cmd);
+ int ret = 0;
+
+ /*
+ * Determine is the TCM fabric module has already allocated physical
+ * memory, and is directly calling transport_generic_map_mem_to_cmd()
+ * to setup beforehand the linked list of physical memory at
+ * T_TASK(cmd)->t_mem_list of struct se_mem->se_page
+ */
+ if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)) {
+ ret = transport_allocate_resources(cmd);
+ if (ret < 0)
+ return ret;
+ }
+
+ ret = transport_get_sectors(cmd);
+ if (ret < 0)
+ return ret;
+
+ ret = transport_new_cmd_obj(cmd);
+ if (ret < 0)
+ return ret;
+
+ /*
+ * Determine if the calling TCM fabric module is talking to
+ * Linux/NET via kernel sockets and needs to allocate a
+ * struct iovec array to complete the struct se_cmd
+ */
+ se_tpg = SE_LUN(cmd)->lun_sep->sep_tpg;
+ if (TPG_TFO(se_tpg)->alloc_cmd_iovecs != NULL) {
+ ret = TPG_TFO(se_tpg)->alloc_cmd_iovecs(cmd);
+ if (ret < 0)
+ return PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES;
+ }
+
+ if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
+ list_for_each_entry(task, &T_TASK(cmd)->t_task_list, t_list) {
+ if (atomic_read(&task->task_sent))
+ continue;
+ if (!dev->transport->map_task_SG)
+ continue;
+
+ ret = dev->transport->map_task_SG(task);
+ if (ret < 0)
+ return ret;
+ }
+ } else {
+ ret = transport_map_control_cmd_to_task(cmd);
+ if (ret < 0)
+ return ret;
+ }
+
+ /*
+ * For WRITEs, let the iSCSI Target RX Thread know its buffer is ready..
+ * This WRITE struct se_cmd (and all of its associated struct se_task's)
+ * will be added to the struct se_device execution queue after its WRITE
+ * data has arrived. (ie: It gets handled by the transport processing
+ * thread a second time)
+ */
+ if (cmd->data_direction == DMA_TO_DEVICE) {
+ transport_add_tasks_to_state_queue(cmd);
+ return transport_generic_write_pending(cmd);
+ }
+ /*
+ * Everything else but a WRITE, add the struct se_cmd's struct se_task's
+ * to the execution queue.
+ */
+ transport_execute_tasks(cmd);
+ return 0;
+}
+
+/* transport_generic_process_write():
+ *
+ *
+ */
+void transport_generic_process_write(struct se_cmd *cmd)
+{
+#if 0
+ /*
+ * Copy SCSI Presented DTL sector(s) from received buffers allocated to
+ * original EDTL
+ */
+ if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
+ if (!T_TASK(cmd)->t_tasks_se_num) {
+ unsigned char *dst, *buf =
+ (unsigned char *)T_TASK(cmd)->t_task_buf;
+
+ dst = kzalloc(cmd->cmd_spdtl), GFP_KERNEL);
+ if (!(dst)) {
+ printk(KERN_ERR "Unable to allocate memory for"
+ " WRITE underflow\n");
+ transport_generic_request_failure(cmd, NULL,
+ PYX_TRANSPORT_REQ_TOO_MANY_SECTORS, 1);
+ return;
+ }
+ memcpy(dst, buf, cmd->cmd_spdtl);
+
+ kfree(T_TASK(cmd)->t_task_buf);
+ T_TASK(cmd)->t_task_buf = dst;
+ } else {
+ struct scatterlist *sg =
+ (struct scatterlist *sg)T_TASK(cmd)->t_task_buf;
+ struct scatterlist *orig_sg;
+
+ orig_sg = kzalloc(sizeof(struct scatterlist) *
+ T_TASK(cmd)->t_tasks_se_num,
+ GFP_KERNEL))) {
+ if (!(orig_sg)) {
+ printk(KERN_ERR "Unable to allocate memory"
+ " for WRITE underflow\n");
+ transport_generic_request_failure(cmd, NULL,
+ PYX_TRANSPORT_REQ_TOO_MANY_SECTORS, 1);
+ return;
+ }
+
+ memcpy(orig_sg, T_TASK(cmd)->t_task_buf,
+ sizeof(struct scatterlist) *
+ T_TASK(cmd)->t_tasks_se_num);
+
+ cmd->data_length = cmd->cmd_spdtl;
+ /*
+ * FIXME, clear out original struct se_task and state
+ * information.
+ */
+ if (transport_generic_new_cmd(cmd) < 0) {
+ transport_generic_request_failure(cmd, NULL,
+ PYX_TRANSPORT_REQ_TOO_MANY_SECTORS, 1);
+ kfree(orig_sg);
+ return;
+ }
+
+ transport_memcpy_write_sg(cmd, orig_sg);
+ }
+ }
+#endif
+ transport_execute_tasks(cmd);
+}
+EXPORT_SYMBOL(transport_generic_process_write);
+
+/* transport_generic_write_pending():
+ *
+ *
+ */
+static int transport_generic_write_pending(struct se_cmd *cmd)
+{
+ unsigned long flags;
+ int ret;
+
+ spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
+ cmd->t_state = TRANSPORT_WRITE_PENDING;
+ spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+ /*
+ * For the TCM control CDBs using a contiguous buffer, do the memcpy
+ * from the passed Linux/SCSI struct scatterlist located at
+ * T_TASK(se_cmd)->t_task_pt_buf to the contiguous buffer at
+ * T_TASK(se_cmd)->t_task_buf.
+ */
+ if (cmd->se_cmd_flags & SCF_PASSTHROUGH_CONTIG_TO_SG)
+ transport_memcpy_read_contig(cmd,
+ T_TASK(cmd)->t_task_buf,
+ T_TASK(cmd)->t_task_pt_sgl);
+ /*
+ * Clear the se_cmd for WRITE_PENDING status in order to set
+ * T_TASK(cmd)->t_transport_active=0 so that transport_generic_handle_data
+ * can be called from HW target mode interrupt code. This is safe
+ * to be called with transport_off=1 before the CMD_TFO(cmd)->write_pending
+ * because the se_cmd->se_lun pointer is not being cleared.
+ */
+ transport_cmd_check_stop(cmd, 1, 0);
+
+ /*
+ * Call the fabric write_pending function here to let the
+ * frontend know that WRITE buffers are ready.
+ */
+ ret = CMD_TFO(cmd)->write_pending(cmd);
+ if (ret < 0)
+ return ret;
+
+ return PYX_TRANSPORT_WRITE_PENDING;
+}
+
+/* transport_release_cmd_to_pool():
+ *
+ *
+ */
+void transport_release_cmd_to_pool(struct se_cmd *cmd)
+{
+ BUG_ON(!T_TASK(cmd));
+ BUG_ON(!CMD_TFO(cmd));
+
+ transport_free_se_cmd(cmd);
+ CMD_TFO(cmd)->release_cmd_to_pool(cmd);
+}
+EXPORT_SYMBOL(transport_release_cmd_to_pool);
+
+/* transport_generic_free_cmd():
+ *
+ * Called from processing frontend to release storage engine resources
+ */
+void transport_generic_free_cmd(
+ struct se_cmd *cmd,
+ int wait_for_tasks,
+ int release_to_pool,
+ int session_reinstatement)
+{
+ if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) || !T_TASK(cmd))
+ transport_release_cmd_to_pool(cmd);
+ else {
+ core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
+
+ if (SE_LUN(cmd)) {
+#if 0
+ printk(KERN_INFO "cmd: %p ITT: 0x%08x contains"
+ " SE_LUN(cmd)\n", cmd,
+ CMD_TFO(cmd)->get_task_tag(cmd));
+#endif
+ transport_lun_remove_cmd(cmd);
+ }
+
+ if (wait_for_tasks && cmd->transport_wait_for_tasks)
+ cmd->transport_wait_for_tasks(cmd, 0, 0);
+
+ transport_generic_remove(cmd, release_to_pool,
+ session_reinstatement);
+ }
+}
+EXPORT_SYMBOL(transport_generic_free_cmd);
+
+static void transport_nop_wait_for_tasks(
+ struct se_cmd *cmd,
+ int remove_cmd,
+ int session_reinstatement)
+{
+ return;
+}
+
+/* transport_lun_wait_for_tasks():
+ *
+ * Called from ConfigFS context to stop the passed struct se_cmd to allow
+ * an struct se_lun to be successfully shutdown.
+ */
+static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
+{
+ unsigned long flags;
+ int ret;
+ /*
+ * If the frontend has already requested this struct se_cmd to
+ * be stopped, we can safely ignore this struct se_cmd.
+ */
+ spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
+ if (atomic_read(&T_TASK(cmd)->t_transport_stop)) {
+ atomic_set(&T_TASK(cmd)->transport_lun_stop, 0);
+ DEBUG_TRANSPORT_S("ConfigFS ITT[0x%08x] - t_transport_stop =="
+ " TRUE, skipping\n", CMD_TFO(cmd)->get_task_tag(cmd));
+ spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+ transport_cmd_check_stop(cmd, 1, 0);
+ return -1;
+ }
+ atomic_set(&T_TASK(cmd)->transport_lun_fe_stop, 1);
+ spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+
+ wake_up_interruptible(&SE_DEV(cmd)->dev_queue_obj->thread_wq);
+
+ ret = transport_stop_tasks_for_cmd(cmd);
+
+ DEBUG_TRANSPORT_S("ConfigFS: cmd: %p t_task_cdbs: %d stop tasks ret:"
+ " %d\n", cmd, T_TASK(cmd)->t_task_cdbs, ret);
+ if (!ret) {
+ DEBUG_TRANSPORT_S("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
+ CMD_TFO(cmd)->get_task_tag(cmd));
+ wait_for_completion(&T_TASK(cmd)->transport_lun_stop_comp);
+ DEBUG_TRANSPORT_S("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
+ CMD_TFO(cmd)->get_task_tag(cmd));
+ }
+ transport_remove_cmd_from_queue(cmd, SE_DEV(cmd)->dev_queue_obj);
+
+ return 0;
+}
+
+/* #define DEBUG_CLEAR_LUN */
+#ifdef DEBUG_CLEAR_LUN
+#define DEBUG_CLEAR_L(x...) printk(KERN_INFO x)
+#else
+#define DEBUG_CLEAR_L(x...)
+#endif
+
+static void __transport_clear_lun_from_sessions(struct se_lun *lun)
+{
+ struct se_cmd *cmd = NULL;
+ unsigned long lun_flags, cmd_flags;
+ /*
+ * Do exception processing and return CHECK_CONDITION status to the
+ * Initiator Port.
+ */
+ spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
+ while (!list_empty_careful(&lun->lun_cmd_list)) {
+ cmd = list_entry(lun->lun_cmd_list.next,
+ struct se_cmd, se_lun_list);
+ list_del(&cmd->se_lun_list);
+
+ if (!(T_TASK(cmd))) {
+ printk(KERN_ERR "ITT: 0x%08x, T_TASK(cmd) = NULL"
+ "[i,t]_state: %u/%u\n",
+ CMD_TFO(cmd)->get_task_tag(cmd),
+ CMD_TFO(cmd)->get_cmd_state(cmd), cmd->t_state);
+ BUG();
+ }
+ atomic_set(&T_TASK(cmd)->transport_lun_active, 0);
+ /*
+ * This will notify iscsi_target_transport.c:
+ * transport_cmd_check_stop() that a LUN shutdown is in
+ * progress for the iscsi_cmd_t.
+ */
+ spin_lock(&T_TASK(cmd)->t_state_lock);
+ DEBUG_CLEAR_L("SE_LUN[%d] - Setting T_TASK(cmd)->transport"
+ "_lun_stop for ITT: 0x%08x\n",
+ SE_LUN(cmd)->unpacked_lun,
+ CMD_TFO(cmd)->get_task_tag(cmd));
+ atomic_set(&T_TASK(cmd)->transport_lun_stop, 1);
+ spin_unlock(&T_TASK(cmd)->t_state_lock);
+
+ spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
+
+ if (!(SE_LUN(cmd))) {
+ printk(KERN_ERR "ITT: 0x%08x, [i,t]_state: %u/%u\n",
+ CMD_TFO(cmd)->get_task_tag(cmd),
+ CMD_TFO(cmd)->get_cmd_state(cmd), cmd->t_state);
+ BUG();
+ }
+ /*
+ * If the Storage engine still owns the iscsi_cmd_t, determine
+ * and/or stop its context.
+ */
+ DEBUG_CLEAR_L("SE_LUN[%d] - ITT: 0x%08x before transport"
+ "_lun_wait_for_tasks()\n", SE_LUN(cmd)->unpacked_lun,
+ CMD_TFO(cmd)->get_task_tag(cmd));
+
+ if (transport_lun_wait_for_tasks(cmd, SE_LUN(cmd)) < 0) {
+ spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
+ continue;
+ }
+
+ DEBUG_CLEAR_L("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
+ "_wait_for_tasks(): SUCCESS\n",
+ SE_LUN(cmd)->unpacked_lun,
+ CMD_TFO(cmd)->get_task_tag(cmd));
+
+ spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, cmd_flags);
+ if (!(atomic_read(&T_TASK(cmd)->transport_dev_active))) {
+ spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, cmd_flags);
+ goto check_cond;
+ }
+ atomic_set(&T_TASK(cmd)->transport_dev_active, 0);
+ transport_all_task_dev_remove_state(cmd);
+ spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, cmd_flags);
+
+ transport_free_dev_tasks(cmd);
+ /*
+ * The Storage engine stopped this struct se_cmd before it was
+ * send to the fabric frontend for delivery back to the
+ * Initiator Node. Return this SCSI CDB back with an
+ * CHECK_CONDITION status.
+ */
+check_cond:
+ transport_send_check_condition_and_sense(cmd,
+ TCM_NON_EXISTENT_LUN, 0);
+ /*
+ * If the fabric frontend is waiting for this iscsi_cmd_t to
+ * be released, notify the waiting thread now that LU has
+ * finished accessing it.
+ */
+ spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, cmd_flags);
+ if (atomic_read(&T_TASK(cmd)->transport_lun_fe_stop)) {
+ DEBUG_CLEAR_L("SE_LUN[%d] - Detected FE stop for"
+ " struct se_cmd: %p ITT: 0x%08x\n",
+ lun->unpacked_lun,
+ cmd, CMD_TFO(cmd)->get_task_tag(cmd));
+
+ spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock,
+ cmd_flags);
+ transport_cmd_check_stop(cmd, 1, 0);
+ complete(&T_TASK(cmd)->transport_lun_fe_stop_comp);
+ spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
+ continue;
+ }
+ DEBUG_CLEAR_L("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
+ lun->unpacked_lun, CMD_TFO(cmd)->get_task_tag(cmd));
+
+ spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, cmd_flags);
+ spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
+ }
+ spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
+}
+
+static int transport_clear_lun_thread(void *p)
+{
+ struct se_lun *lun = (struct se_lun *)p;
+
+ __transport_clear_lun_from_sessions(lun);
+ complete(&lun->lun_shutdown_comp);
+
+ return 0;
+}
+
+int transport_clear_lun_from_sessions(struct se_lun *lun)
+{
+ struct task_struct *kt;
+
+ kt = kthread_run(transport_clear_lun_thread, (void *)lun,
+ "tcm_cl_%u", lun->unpacked_lun);
+ if (IS_ERR(kt)) {
+ printk(KERN_ERR "Unable to start clear_lun thread\n");
+ return -1;
+ }
+ wait_for_completion(&lun->lun_shutdown_comp);
+
+ return 0;
+}
+
+/* transport_generic_wait_for_tasks():
+ *
+ * Called from frontend or passthrough context to wait for storage engine
+ * to pause and/or release frontend generated struct se_cmd.
+ */
+static void transport_generic_wait_for_tasks(
+ struct se_cmd *cmd,
+ int remove_cmd,
+ int session_reinstatement)
+{
+ unsigned long flags;
+
+ if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && !(cmd->se_tmr_req))
+ return;
+
+ spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
+ /*
+ * If we are already stopped due to an external event (ie: LUN shutdown)
+ * sleep until the connection can have the passed struct se_cmd back.
+ * The T_TASK(cmd)->transport_lun_stopped_sem will be upped by
+ * transport_clear_lun_from_sessions() once the ConfigFS context caller
+ * has completed its operation on the struct se_cmd.
+ */
+ if (atomic_read(&T_TASK(cmd)->transport_lun_stop)) {
+
+ DEBUG_TRANSPORT_S("wait_for_tasks: Stopping"
+ " wait_for_completion(&T_TASK(cmd)transport_lun_fe"
+ "_stop_comp); for ITT: 0x%08x\n",
+ CMD_TFO(cmd)->get_task_tag(cmd));
+ /*
+ * There is a special case for WRITES where a FE exception +
+ * LUN shutdown means ConfigFS context is still sleeping on
+ * transport_lun_stop_comp in transport_lun_wait_for_tasks().
+ * We go ahead and up transport_lun_stop_comp just to be sure
+ * here.
+ */
+ spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+ complete(&T_TASK(cmd)->transport_lun_stop_comp);
+ wait_for_completion(&T_TASK(cmd)->transport_lun_fe_stop_comp);
+ spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
+
+ transport_all_task_dev_remove_state(cmd);
+ /*
+ * At this point, the frontend who was the originator of this
+ * struct se_cmd, now owns the structure and can be released through
+ * normal means below.
+ */
+ DEBUG_TRANSPORT_S("wait_for_tasks: Stopped"
+ " wait_for_completion(&T_TASK(cmd)transport_lun_fe_"
+ "stop_comp); for ITT: 0x%08x\n",
+ CMD_TFO(cmd)->get_task_tag(cmd));
+
+ atomic_set(&T_TASK(cmd)->transport_lun_stop, 0);
+ }
+ if (!atomic_read(&T_TASK(cmd)->t_transport_active))
+ goto remove;
+
+ atomic_set(&T_TASK(cmd)->t_transport_stop, 1);
+
+ DEBUG_TRANSPORT_S("wait_for_tasks: Stopping %p ITT: 0x%08x"
+ " i_state: %d, t_state/def_t_state: %d/%d, t_transport_stop"
+ " = TRUE\n", cmd, CMD_TFO(cmd)->get_task_tag(cmd),
+ CMD_TFO(cmd)->get_cmd_state(cmd), cmd->t_state,
+ cmd->deferred_t_state);
+
+ spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+
+ wake_up_interruptible(&SE_DEV(cmd)->dev_queue_obj->thread_wq);
+
+ wait_for_completion(&T_TASK(cmd)->t_transport_stop_comp);
+
+ spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
+ atomic_set(&T_TASK(cmd)->t_transport_active, 0);
+ atomic_set(&T_TASK(cmd)->t_transport_stop, 0);
+
+ DEBUG_TRANSPORT_S("wait_for_tasks: Stopped wait_for_compltion("
+ "&T_TASK(cmd)->t_transport_stop_comp) for ITT: 0x%08x\n",
+ CMD_TFO(cmd)->get_task_tag(cmd));
+remove:
+ spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+ if (!remove_cmd)
+ return;
+
+ transport_generic_free_cmd(cmd, 0, 0, session_reinstatement);
+}
+
+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 int transport_set_sense_codes(
+ struct se_cmd *cmd,
+ u8 asc,
+ u8 ascq)
+{
+ cmd->scsi_asc = asc;
+ cmd->scsi_ascq = ascq;
+
+ return 0;
+}
+
+int transport_send_check_condition_and_sense(
+ struct se_cmd *cmd,
+ u8 reason,
+ int from_transport)
+{
+ unsigned char *buffer = cmd->sense_buffer;
+ unsigned long flags;
+ int offset;
+ u8 asc = 0, ascq = 0;
+
+ spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
+ if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
+ spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+ return 0;
+ }
+ cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
+ spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+
+ if (!reason && from_transport)
+ goto after_reason;
+
+ if (!from_transport)
+ cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
+ /*
+ * Data Segment and SenseLength of the fabric response PDU.
+ *
+ * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
+ * from include/scsi/scsi_cmnd.h
+ */
+ offset = CMD_TFO(cmd)->set_fabric_sense_len(cmd,
+ TRANSPORT_SENSE_BUFFER);
+ /*
+ * 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_NON_EXISTENT_LUN:
+ case TCM_UNSUPPORTED_SCSI_OPCODE:
+ case TCM_SECTOR_COUNT_TOO_MANY:
+ /* CURRENT ERROR */
+ buffer[offset] = 0x70;
+ /* ILLEGAL REQUEST */
+ buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
+ /* INVALID COMMAND OPERATION CODE */
+ buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
+ break;
+ case TCM_UNKNOWN_MODE_PAGE:
+ /* CURRENT ERROR */
+ buffer[offset] = 0x70;
+ /* ILLEGAL REQUEST */
+ buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
+ /* INVALID FIELD IN CDB */
+ buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
+ break;
+ case TCM_CHECK_CONDITION_ABORT_CMD:
+ /* CURRENT ERROR */
+ buffer[offset] = 0x70;
+ /* ABORTED COMMAND */
+ buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
+ /* BUS DEVICE RESET FUNCTION OCCURRED */
+ buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
+ buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
+ break;
+ case TCM_INCORRECT_AMOUNT_OF_DATA:
+ /* CURRENT ERROR */
+ buffer[offset] = 0x70;
+ /* ABORTED COMMAND */
+ buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
+ /* WRITE ERROR */
+ buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
+ /* NOT ENOUGH UNSOLICITED DATA */
+ buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
+ break;
+ case TCM_INVALID_CDB_FIELD:
+ /* CURRENT ERROR */
+ buffer[offset] = 0x70;
+ /* ABORTED COMMAND */
+ buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
+ /* INVALID FIELD IN CDB */
+ buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
+ break;
+ case TCM_INVALID_PARAMETER_LIST:
+ /* CURRENT ERROR */
+ buffer[offset] = 0x70;
+ /* ABORTED COMMAND */
+ buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
+ /* INVALID FIELD IN PARAMETER LIST */
+ buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
+ break;
+ case TCM_UNEXPECTED_UNSOLICITED_DATA:
+ /* CURRENT ERROR */
+ buffer[offset] = 0x70;
+ /* ABORTED COMMAND */
+ buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
+ /* WRITE ERROR */
+ buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
+ /* UNEXPECTED_UNSOLICITED_DATA */
+ buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
+ break;
+ case TCM_SERVICE_CRC_ERROR:
+ /* CURRENT ERROR */
+ buffer[offset] = 0x70;
+ /* ABORTED COMMAND */
+ buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
+ /* PROTOCOL SERVICE CRC ERROR */
+ buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
+ /* N/A */
+ buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
+ break;
+ case TCM_SNACK_REJECTED:
+ /* CURRENT ERROR */
+ buffer[offset] = 0x70;
+ /* ABORTED COMMAND */
+ buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
+ /* READ ERROR */
+ buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
+ /* FAILED RETRANSMISSION REQUEST */
+ buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
+ break;
+ case TCM_WRITE_PROTECTED:
+ /* CURRENT ERROR */
+ buffer[offset] = 0x70;
+ /* DATA PROTECT */
+ buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
+ /* WRITE PROTECTED */
+ buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
+ break;
+ case TCM_CHECK_CONDITION_UNIT_ATTENTION:
+ /* CURRENT ERROR */
+ buffer[offset] = 0x70;
+ /* UNIT ATTENTION */
+ buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
+ core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
+ buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
+ buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
+ break;
+ case TCM_CHECK_CONDITION_NOT_READY:
+ /* CURRENT ERROR */
+ buffer[offset] = 0x70;
+ /* Not Ready */
+ buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
+ transport_get_sense_codes(cmd, &asc, &ascq);
+ buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
+ buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
+ break;
+ case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
+ default:
+ /* CURRENT ERROR */
+ buffer[offset] = 0x70;
+ /* ILLEGAL REQUEST */
+ buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
+ /* LOGICAL UNIT COMMUNICATION FAILURE */
+ buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
+ 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 + offset;
+
+after_reason:
+ CMD_TFO(cmd)->queue_status(cmd);
+ return 0;
+}
+EXPORT_SYMBOL(transport_send_check_condition_and_sense);
+
+int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
+{
+ int ret = 0;
+
+ if (atomic_read(&T_TASK(cmd)->t_transport_aborted) != 0) {
+ if (!(send_status) ||
+ (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
+ return 1;
+#if 0
+ printk(KERN_INFO "Sending delayed SAM_STAT_TASK_ABORTED"
+ " status for CDB: 0x%02x ITT: 0x%08x\n",
+ T_TASK(cmd)->t_task_cdb[0],
+ CMD_TFO(cmd)->get_task_tag(cmd));
+#endif
+ cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
+ CMD_TFO(cmd)->queue_status(cmd);
+ ret = 1;
+ }
+ return ret;
+}
+EXPORT_SYMBOL(transport_check_aborted_status);
+
+void transport_send_task_abort(struct se_cmd *cmd)
+{
+ /*
+ * 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_TFO(cmd)->write_pending_status(cmd) != 0) {
+ atomic_inc(&T_TASK(cmd)->t_transport_aborted);
+ smp_mb__after_atomic_inc();
+ cmd->scsi_status = SAM_STAT_TASK_ABORTED;
+ transport_new_cmd_failure(cmd);
+ return;
+ }
+ }
+ cmd->scsi_status = SAM_STAT_TASK_ABORTED;
+#if 0
+ printk(KERN_INFO "Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
+ " ITT: 0x%08x\n", T_TASK(cmd)->t_task_cdb[0],
+ CMD_TFO(cmd)->get_task_tag(cmd));
+#endif
+ CMD_TFO(cmd)->queue_status(cmd);
+}
+
+/* transport_generic_do_tmr():
+ *
+ *
+ */
+int transport_generic_do_tmr(struct se_cmd *cmd)
+{
+ struct se_cmd *ref_cmd;
+ struct se_device *dev = SE_DEV(cmd);
+ struct se_tmr_req *tmr = cmd->se_tmr_req;
+ int ret;
+
+ switch (tmr->function) {
+ case ABORT_TASK:
+ ref_cmd = tmr->ref_cmd;
+ tmr->response = TMR_FUNCTION_REJECTED;
+ break;
+ case ABORT_TASK_SET:
+ case CLEAR_ACA:
+ case CLEAR_TASK_SET:
+ tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
+ break;
+ case LUN_RESET:
+ ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
+ tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
+ TMR_FUNCTION_REJECTED;
+ break;
+#if 0
+ case TARGET_WARM_RESET:
+ transport_generic_host_reset(dev->se_hba);
+ tmr->response = TMR_FUNCTION_REJECTED;
+ break;
+ case TARGET_COLD_RESET:
+ transport_generic_host_reset(dev->se_hba);
+ transport_generic_cold_reset(dev->se_hba);
+ tmr->response = TMR_FUNCTION_REJECTED;
+ break;
+#endif
+ default:
+ printk(KERN_ERR "Uknown TMR function: 0x%02x.\n",
+ tmr->function);
+ tmr->response = TMR_FUNCTION_REJECTED;
+ break;
+ }
+
+ cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
+ CMD_TFO(cmd)->queue_tm_rsp(cmd);
+
+ transport_cmd_check_stop(cmd, 2, 0);
+ return 0;
+}
+
+/*
+ * Called with spin_lock_irq(&dev->execute_task_lock); held
+ *
+ */
+static struct se_task *
+transport_get_task_from_state_list(struct se_device *dev)
+{
+ struct se_task *task;
+
+ if (list_empty(&dev->state_task_list))
+ return NULL;
+
+ list_for_each_entry(task, &dev->state_task_list, t_state_list)
+ break;
+
+ list_del(&task->t_state_list);
+ atomic_set(&task->task_state_active, 0);
+
+ return task;
+}
+
+static void transport_processing_shutdown(struct se_device *dev)
+{
+ struct se_cmd *cmd;
+ struct se_queue_req *qr;
+ struct se_task *task;
+ u8 state;
+ unsigned long flags;
+ /*
+ * Empty the struct se_device's struct se_task state list.
+ */
+ spin_lock_irqsave(&dev->execute_task_lock, flags);
+ while ((task = transport_get_task_from_state_list(dev))) {
+ if (!(TASK_CMD(task))) {
+ printk(KERN_ERR "TASK_CMD(task) is NULL!\n");
+ continue;
+ }
+ cmd = TASK_CMD(task);
+
+ if (!T_TASK(cmd)) {
+ printk(KERN_ERR "T_TASK(cmd) is NULL for task: %p cmd:"
+ " %p ITT: 0x%08x\n", task, cmd,
+ CMD_TFO(cmd)->get_task_tag(cmd));
+ continue;
+ }
+ spin_unlock_irqrestore(&dev->execute_task_lock, flags);
+
+ spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
+
+ DEBUG_DO("PT: cmd: %p task: %p ITT/CmdSN: 0x%08x/0x%08x,"
+ " i_state/def_i_state: %d/%d, t_state/def_t_state:"
+ " %d/%d cdb: 0x%02x\n", cmd, task,
+ CMD_TFO(cmd)->get_task_tag(cmd), cmd->cmd_sn,
+ CMD_TFO(cmd)->get_cmd_state(cmd), cmd->deferred_i_state,
+ cmd->t_state, cmd->deferred_t_state,
+ T_TASK(cmd)->t_task_cdb[0]);
+ DEBUG_DO("PT: ITT[0x%08x] - t_task_cdbs: %d t_task_cdbs_left:"
+ " %d t_task_cdbs_sent: %d -- t_transport_active: %d"
+ " t_transport_stop: %d t_transport_sent: %d\n",
+ CMD_TFO(cmd)->get_task_tag(cmd),
+ T_TASK(cmd)->t_task_cdbs,
+ atomic_read(&T_TASK(cmd)->t_task_cdbs_left),
+ atomic_read(&T_TASK(cmd)->t_task_cdbs_sent),
+ atomic_read(&T_TASK(cmd)->t_transport_active),
+ atomic_read(&T_TASK(cmd)->t_transport_stop),
+ atomic_read(&T_TASK(cmd)->t_transport_sent));
+
+ if (atomic_read(&task->task_active)) {
+ atomic_set(&task->task_stop, 1);
+ spin_unlock_irqrestore(
+ &T_TASK(cmd)->t_state_lock, flags);
+
+ DEBUG_DO("Waiting for task: %p to shutdown for dev:"
+ " %p\n", task, dev);
+ wait_for_completion(&task->task_stop_comp);
+ DEBUG_DO("Completed task: %p shutdown for dev: %p\n",
+ task, dev);
+
+ spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
+ atomic_dec(&T_TASK(cmd)->t_task_cdbs_left);
+
+ atomic_set(&task->task_active, 0);
+ atomic_set(&task->task_stop, 0);
+ }
+ __transport_stop_task_timer(task, &flags);
+
+ if (!(atomic_dec_and_test(&T_TASK(cmd)->t_task_cdbs_ex_left))) {
+ spin_unlock_irqrestore(
+ &T_TASK(cmd)->t_state_lock, flags);
+
+ DEBUG_DO("Skipping task: %p, dev: %p for"
+ " t_task_cdbs_ex_left: %d\n", task, dev,
+ atomic_read(&T_TASK(cmd)->t_task_cdbs_ex_left));
+
+ spin_lock_irqsave(&dev->execute_task_lock, flags);
+ continue;
+ }
+
+ if (atomic_read(&T_TASK(cmd)->t_transport_active)) {
+ DEBUG_DO("got t_transport_active = 1 for task: %p, dev:"
+ " %p\n", task, dev);
+
+ if (atomic_read(&T_TASK(cmd)->t_fe_count)) {
+ spin_unlock_irqrestore(
+ &T_TASK(cmd)->t_state_lock, flags);
+ transport_send_check_condition_and_sense(
+ cmd, TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE,
+ 0);
+ transport_remove_cmd_from_queue(cmd,
+ SE_DEV(cmd)->dev_queue_obj);
+
+ transport_lun_remove_cmd(cmd);
+ transport_cmd_check_stop(cmd, 1, 0);
+ } else {
+ spin_unlock_irqrestore(
+ &T_TASK(cmd)->t_state_lock, flags);
+
+ transport_remove_cmd_from_queue(cmd,
+ SE_DEV(cmd)->dev_queue_obj);
+
+ transport_lun_remove_cmd(cmd);
+
+ if (transport_cmd_check_stop(cmd, 1, 0))
+ transport_generic_remove(cmd, 0, 0);
+ }
+
+ spin_lock_irqsave(&dev->execute_task_lock, flags);
+ continue;
+ }
+ DEBUG_DO("Got t_transport_active = 0 for task: %p, dev: %p\n",
+ task, dev);
+
+ if (atomic_read(&T_TASK(cmd)->t_fe_count)) {
+ spin_unlock_irqrestore(
+ &T_TASK(cmd)->t_state_lock, flags);
+ transport_send_check_condition_and_sense(cmd,
+ TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
+ transport_remove_cmd_from_queue(cmd,
+ SE_DEV(cmd)->dev_queue_obj);
+
+ transport_lun_remove_cmd(cmd);
+ transport_cmd_check_stop(cmd, 1, 0);
+ } else {
+ spin_unlock_irqrestore(
+ &T_TASK(cmd)->t_state_lock, flags);
+
+ transport_remove_cmd_from_queue(cmd,
+ SE_DEV(cmd)->dev_queue_obj);
+ transport_lun_remove_cmd(cmd);
+
+ if (transport_cmd_check_stop(cmd, 1, 0))
+ transport_generic_remove(cmd, 0, 0);
+ }
+
+ spin_lock_irqsave(&dev->execute_task_lock, flags);
+ }
+ spin_unlock_irqrestore(&dev->execute_task_lock, flags);
+ /*
+ * Empty the struct se_device's struct se_cmd list.
+ */
+ spin_lock_irqsave(&dev->dev_queue_obj->cmd_queue_lock, flags);
+ while ((qr = __transport_get_qr_from_queue(dev->dev_queue_obj))) {
+ spin_unlock_irqrestore(
+ &dev->dev_queue_obj->cmd_queue_lock, flags);
+ cmd = (struct se_cmd *)qr->cmd;
+ state = qr->state;
+ kfree(qr);
+
+ DEBUG_DO("From Device Queue: cmd: %p t_state: %d\n",
+ cmd, state);
+
+ if (atomic_read(&T_TASK(cmd)->t_fe_count)) {
+ transport_send_check_condition_and_sense(cmd,
+ TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
+
+ transport_lun_remove_cmd(cmd);
+ transport_cmd_check_stop(cmd, 1, 0);
+ } else {
+ transport_lun_remove_cmd(cmd);
+ if (transport_cmd_check_stop(cmd, 1, 0))
+ transport_generic_remove(cmd, 0, 0);
+ }
+ spin_lock_irqsave(&dev->dev_queue_obj->cmd_queue_lock, flags);
+ }
+ spin_unlock_irqrestore(&dev->dev_queue_obj->cmd_queue_lock, flags);
+}
+
+/* transport_processing_thread():
+ *
+ *
+ */
+static int transport_processing_thread(void *param)
+{
+ int ret, t_state;
+ struct se_cmd *cmd;
+ struct se_device *dev = (struct se_device *) param;
+ struct se_queue_req *qr;
+
+ set_user_nice(current, -20);
+
+ while (!kthread_should_stop()) {
+ ret = wait_event_interruptible(dev->dev_queue_obj->thread_wq,
+ atomic_read(&dev->dev_queue_obj->queue_cnt) ||
+ kthread_should_stop());
+ if (ret < 0)
+ goto out;
+
+ spin_lock_irq(&dev->dev_status_lock);
+ if (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN) {
+ spin_unlock_irq(&dev->dev_status_lock);
+ transport_processing_shutdown(dev);
+ continue;
+ }
+ spin_unlock_irq(&dev->dev_status_lock);
+
+get_cmd:
+ __transport_execute_tasks(dev);
+
+ qr = transport_get_qr_from_queue(dev->dev_queue_obj);
+ if (!(qr))
+ continue;
+
+ cmd = (struct se_cmd *)qr->cmd;
+ t_state = qr->state;
+ kfree(qr);
+
+ switch (t_state) {
+ case TRANSPORT_NEW_CMD_MAP:
+ if (!(CMD_TFO(cmd)->new_cmd_map)) {
+ printk(KERN_ERR "CMD_TFO(cmd)->new_cmd_map is"
+ " NULL for TRANSPORT_NEW_CMD_MAP\n");
+ BUG();
+ }
+ ret = CMD_TFO(cmd)->new_cmd_map(cmd);
+ if (ret < 0) {
+ cmd->transport_error_status = ret;
+ transport_generic_request_failure(cmd, NULL,
+ 0, (cmd->data_direction !=
+ DMA_TO_DEVICE));
+ break;
+ }
+ /* Fall through */
+ case TRANSPORT_NEW_CMD:
+ ret = transport_generic_new_cmd(cmd);
+ if (ret < 0) {
+ cmd->transport_error_status = ret;
+ transport_generic_request_failure(cmd, NULL,
+ 0, (cmd->data_direction !=
+ DMA_TO_DEVICE));
+ }
+ break;
+ case TRANSPORT_PROCESS_WRITE:
+ transport_generic_process_write(cmd);
+ break;
+ case TRANSPORT_COMPLETE_OK:
+ transport_stop_all_task_timers(cmd);
+ transport_generic_complete_ok(cmd);
+ break;
+ case TRANSPORT_REMOVE:
+ transport_generic_remove(cmd, 1, 0);
+ break;
+ case TRANSPORT_PROCESS_TMR:
+ transport_generic_do_tmr(cmd);
+ break;
+ case TRANSPORT_COMPLETE_FAILURE:
+ transport_generic_request_failure(cmd, NULL, 1, 1);
+ break;
+ case TRANSPORT_COMPLETE_TIMEOUT:
+ transport_stop_all_task_timers(cmd);
+ transport_generic_request_timeout(cmd);
+ break;
+ default:
+ printk(KERN_ERR "Unknown t_state: %d deferred_t_state:"
+ " %d for ITT: 0x%08x i_state: %d on SE LUN:"
+ " %u\n", t_state, cmd->deferred_t_state,
+ CMD_TFO(cmd)->get_task_tag(cmd),
+ CMD_TFO(cmd)->get_cmd_state(cmd),
+ SE_LUN(cmd)->unpacked_lun);
+ BUG();
+ }
+
+ goto get_cmd;
+ }
+
+out:
+ transport_release_all_cmds(dev);
+ dev->process_thread = NULL;
+ return 0;
+}