diff options
Diffstat (limited to 'drivers/target/target_core_transport.c')
| -rw-r--r-- | drivers/target/target_core_transport.c | 6134 |
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 000000000000..28b6292ff298 --- /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, §or_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, §or_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, §or_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, §or_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, §or_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, §or_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, §or_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, §or_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, §or_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, §or_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, §or_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, §or_ret); + T_TASK(cmd)->t_task_lba = transport_lba_32(cdb); + } else { + sectors = transport_get_sectors_16(cdb, cmd, §or_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, §or_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; +} |