| 1 | /******************************************************************************* |
| 2 | * Filename: target_core_transport.c |
| 3 | * |
| 4 | * This file contains the Generic Target Engine Core. |
| 5 | * |
| 6 | * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc. |
| 7 | * Copyright (c) 2005, 2006, 2007 SBE, Inc. |
| 8 | * Copyright (c) 2007-2010 Rising Tide Systems |
| 9 | * Copyright (c) 2008-2010 Linux-iSCSI.org |
| 10 | * |
| 11 | * Nicholas A. Bellinger <nab@kernel.org> |
| 12 | * |
| 13 | * This program is free software; you can redistribute it and/or modify |
| 14 | * it under the terms of the GNU General Public License as published by |
| 15 | * the Free Software Foundation; either version 2 of the License, or |
| 16 | * (at your option) any later version. |
| 17 | * |
| 18 | * This program is distributed in the hope that it will be useful, |
| 19 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 21 | * GNU General Public License for more details. |
| 22 | * |
| 23 | * You should have received a copy of the GNU General Public License |
| 24 | * along with this program; if not, write to the Free Software |
| 25 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 26 | * |
| 27 | ******************************************************************************/ |
| 28 | |
| 29 | #include <linux/net.h> |
| 30 | #include <linux/delay.h> |
| 31 | #include <linux/string.h> |
| 32 | #include <linux/timer.h> |
| 33 | #include <linux/slab.h> |
| 34 | #include <linux/blkdev.h> |
| 35 | #include <linux/spinlock.h> |
| 36 | #include <linux/kthread.h> |
| 37 | #include <linux/in.h> |
| 38 | #include <linux/cdrom.h> |
| 39 | #include <linux/module.h> |
| 40 | #include <linux/ratelimit.h> |
| 41 | #include <asm/unaligned.h> |
| 42 | #include <net/sock.h> |
| 43 | #include <net/tcp.h> |
| 44 | #include <scsi/scsi.h> |
| 45 | #include <scsi/scsi_cmnd.h> |
| 46 | #include <scsi/scsi_tcq.h> |
| 47 | |
| 48 | #include <target/target_core_base.h> |
| 49 | #include <target/target_core_backend.h> |
| 50 | #include <target/target_core_fabric.h> |
| 51 | #include <target/target_core_configfs.h> |
| 52 | |
| 53 | #include "target_core_internal.h" |
| 54 | #include "target_core_alua.h" |
| 55 | #include "target_core_pr.h" |
| 56 | #include "target_core_ua.h" |
| 57 | |
| 58 | static int sub_api_initialized; |
| 59 | |
| 60 | static struct workqueue_struct *target_completion_wq; |
| 61 | static struct kmem_cache *se_sess_cache; |
| 62 | struct kmem_cache *se_ua_cache; |
| 63 | struct kmem_cache *t10_pr_reg_cache; |
| 64 | struct kmem_cache *t10_alua_lu_gp_cache; |
| 65 | struct kmem_cache *t10_alua_lu_gp_mem_cache; |
| 66 | struct kmem_cache *t10_alua_tg_pt_gp_cache; |
| 67 | struct kmem_cache *t10_alua_tg_pt_gp_mem_cache; |
| 68 | |
| 69 | static void transport_complete_task_attr(struct se_cmd *cmd); |
| 70 | static void transport_handle_queue_full(struct se_cmd *cmd, |
| 71 | struct se_device *dev); |
| 72 | static int transport_generic_get_mem(struct se_cmd *cmd); |
| 73 | static int target_get_sess_cmd(struct se_session *, struct se_cmd *, bool); |
| 74 | static void transport_put_cmd(struct se_cmd *cmd); |
| 75 | static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq); |
| 76 | static void target_complete_ok_work(struct work_struct *work); |
| 77 | |
| 78 | int init_se_kmem_caches(void) |
| 79 | { |
| 80 | se_sess_cache = kmem_cache_create("se_sess_cache", |
| 81 | sizeof(struct se_session), __alignof__(struct se_session), |
| 82 | 0, NULL); |
| 83 | if (!se_sess_cache) { |
| 84 | pr_err("kmem_cache_create() for struct se_session" |
| 85 | " failed\n"); |
| 86 | goto out; |
| 87 | } |
| 88 | se_ua_cache = kmem_cache_create("se_ua_cache", |
| 89 | sizeof(struct se_ua), __alignof__(struct se_ua), |
| 90 | 0, NULL); |
| 91 | if (!se_ua_cache) { |
| 92 | pr_err("kmem_cache_create() for struct se_ua failed\n"); |
| 93 | goto out_free_sess_cache; |
| 94 | } |
| 95 | t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache", |
| 96 | sizeof(struct t10_pr_registration), |
| 97 | __alignof__(struct t10_pr_registration), 0, NULL); |
| 98 | if (!t10_pr_reg_cache) { |
| 99 | pr_err("kmem_cache_create() for struct t10_pr_registration" |
| 100 | " failed\n"); |
| 101 | goto out_free_ua_cache; |
| 102 | } |
| 103 | t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache", |
| 104 | sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp), |
| 105 | 0, NULL); |
| 106 | if (!t10_alua_lu_gp_cache) { |
| 107 | pr_err("kmem_cache_create() for t10_alua_lu_gp_cache" |
| 108 | " failed\n"); |
| 109 | goto out_free_pr_reg_cache; |
| 110 | } |
| 111 | t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache", |
| 112 | sizeof(struct t10_alua_lu_gp_member), |
| 113 | __alignof__(struct t10_alua_lu_gp_member), 0, NULL); |
| 114 | if (!t10_alua_lu_gp_mem_cache) { |
| 115 | pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_" |
| 116 | "cache failed\n"); |
| 117 | goto out_free_lu_gp_cache; |
| 118 | } |
| 119 | t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache", |
| 120 | sizeof(struct t10_alua_tg_pt_gp), |
| 121 | __alignof__(struct t10_alua_tg_pt_gp), 0, NULL); |
| 122 | if (!t10_alua_tg_pt_gp_cache) { |
| 123 | pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_" |
| 124 | "cache failed\n"); |
| 125 | goto out_free_lu_gp_mem_cache; |
| 126 | } |
| 127 | t10_alua_tg_pt_gp_mem_cache = kmem_cache_create( |
| 128 | "t10_alua_tg_pt_gp_mem_cache", |
| 129 | sizeof(struct t10_alua_tg_pt_gp_member), |
| 130 | __alignof__(struct t10_alua_tg_pt_gp_member), |
| 131 | 0, NULL); |
| 132 | if (!t10_alua_tg_pt_gp_mem_cache) { |
| 133 | pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_" |
| 134 | "mem_t failed\n"); |
| 135 | goto out_free_tg_pt_gp_cache; |
| 136 | } |
| 137 | |
| 138 | target_completion_wq = alloc_workqueue("target_completion", |
| 139 | WQ_MEM_RECLAIM, 0); |
| 140 | if (!target_completion_wq) |
| 141 | goto out_free_tg_pt_gp_mem_cache; |
| 142 | |
| 143 | return 0; |
| 144 | |
| 145 | out_free_tg_pt_gp_mem_cache: |
| 146 | kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache); |
| 147 | out_free_tg_pt_gp_cache: |
| 148 | kmem_cache_destroy(t10_alua_tg_pt_gp_cache); |
| 149 | out_free_lu_gp_mem_cache: |
| 150 | kmem_cache_destroy(t10_alua_lu_gp_mem_cache); |
| 151 | out_free_lu_gp_cache: |
| 152 | kmem_cache_destroy(t10_alua_lu_gp_cache); |
| 153 | out_free_pr_reg_cache: |
| 154 | kmem_cache_destroy(t10_pr_reg_cache); |
| 155 | out_free_ua_cache: |
| 156 | kmem_cache_destroy(se_ua_cache); |
| 157 | out_free_sess_cache: |
| 158 | kmem_cache_destroy(se_sess_cache); |
| 159 | out: |
| 160 | return -ENOMEM; |
| 161 | } |
| 162 | |
| 163 | void release_se_kmem_caches(void) |
| 164 | { |
| 165 | destroy_workqueue(target_completion_wq); |
| 166 | kmem_cache_destroy(se_sess_cache); |
| 167 | kmem_cache_destroy(se_ua_cache); |
| 168 | kmem_cache_destroy(t10_pr_reg_cache); |
| 169 | kmem_cache_destroy(t10_alua_lu_gp_cache); |
| 170 | kmem_cache_destroy(t10_alua_lu_gp_mem_cache); |
| 171 | kmem_cache_destroy(t10_alua_tg_pt_gp_cache); |
| 172 | kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache); |
| 173 | } |
| 174 | |
| 175 | /* This code ensures unique mib indexes are handed out. */ |
| 176 | static DEFINE_SPINLOCK(scsi_mib_index_lock); |
| 177 | static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX]; |
| 178 | |
| 179 | /* |
| 180 | * Allocate a new row index for the entry type specified |
| 181 | */ |
| 182 | u32 scsi_get_new_index(scsi_index_t type) |
| 183 | { |
| 184 | u32 new_index; |
| 185 | |
| 186 | BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX)); |
| 187 | |
| 188 | spin_lock(&scsi_mib_index_lock); |
| 189 | new_index = ++scsi_mib_index[type]; |
| 190 | spin_unlock(&scsi_mib_index_lock); |
| 191 | |
| 192 | return new_index; |
| 193 | } |
| 194 | |
| 195 | void transport_subsystem_check_init(void) |
| 196 | { |
| 197 | int ret; |
| 198 | |
| 199 | if (sub_api_initialized) |
| 200 | return; |
| 201 | |
| 202 | ret = request_module("target_core_iblock"); |
| 203 | if (ret != 0) |
| 204 | pr_err("Unable to load target_core_iblock\n"); |
| 205 | |
| 206 | ret = request_module("target_core_file"); |
| 207 | if (ret != 0) |
| 208 | pr_err("Unable to load target_core_file\n"); |
| 209 | |
| 210 | ret = request_module("target_core_pscsi"); |
| 211 | if (ret != 0) |
| 212 | pr_err("Unable to load target_core_pscsi\n"); |
| 213 | |
| 214 | ret = request_module("target_core_stgt"); |
| 215 | if (ret != 0) |
| 216 | pr_err("Unable to load target_core_stgt\n"); |
| 217 | |
| 218 | sub_api_initialized = 1; |
| 219 | return; |
| 220 | } |
| 221 | |
| 222 | struct se_session *transport_init_session(void) |
| 223 | { |
| 224 | struct se_session *se_sess; |
| 225 | |
| 226 | se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL); |
| 227 | if (!se_sess) { |
| 228 | pr_err("Unable to allocate struct se_session from" |
| 229 | " se_sess_cache\n"); |
| 230 | return ERR_PTR(-ENOMEM); |
| 231 | } |
| 232 | INIT_LIST_HEAD(&se_sess->sess_list); |
| 233 | INIT_LIST_HEAD(&se_sess->sess_acl_list); |
| 234 | INIT_LIST_HEAD(&se_sess->sess_cmd_list); |
| 235 | spin_lock_init(&se_sess->sess_cmd_lock); |
| 236 | kref_init(&se_sess->sess_kref); |
| 237 | |
| 238 | return se_sess; |
| 239 | } |
| 240 | EXPORT_SYMBOL(transport_init_session); |
| 241 | |
| 242 | /* |
| 243 | * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called. |
| 244 | */ |
| 245 | void __transport_register_session( |
| 246 | struct se_portal_group *se_tpg, |
| 247 | struct se_node_acl *se_nacl, |
| 248 | struct se_session *se_sess, |
| 249 | void *fabric_sess_ptr) |
| 250 | { |
| 251 | unsigned char buf[PR_REG_ISID_LEN]; |
| 252 | |
| 253 | se_sess->se_tpg = se_tpg; |
| 254 | se_sess->fabric_sess_ptr = fabric_sess_ptr; |
| 255 | /* |
| 256 | * Used by struct se_node_acl's under ConfigFS to locate active se_session-t |
| 257 | * |
| 258 | * Only set for struct se_session's that will actually be moving I/O. |
| 259 | * eg: *NOT* discovery sessions. |
| 260 | */ |
| 261 | if (se_nacl) { |
| 262 | /* |
| 263 | * If the fabric module supports an ISID based TransportID, |
| 264 | * save this value in binary from the fabric I_T Nexus now. |
| 265 | */ |
| 266 | if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { |
| 267 | memset(&buf[0], 0, PR_REG_ISID_LEN); |
| 268 | se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, |
| 269 | &buf[0], PR_REG_ISID_LEN); |
| 270 | se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]); |
| 271 | } |
| 272 | kref_get(&se_nacl->acl_kref); |
| 273 | |
| 274 | spin_lock_irq(&se_nacl->nacl_sess_lock); |
| 275 | /* |
| 276 | * The se_nacl->nacl_sess pointer will be set to the |
| 277 | * last active I_T Nexus for each struct se_node_acl. |
| 278 | */ |
| 279 | se_nacl->nacl_sess = se_sess; |
| 280 | |
| 281 | list_add_tail(&se_sess->sess_acl_list, |
| 282 | &se_nacl->acl_sess_list); |
| 283 | spin_unlock_irq(&se_nacl->nacl_sess_lock); |
| 284 | } |
| 285 | list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list); |
| 286 | |
| 287 | pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n", |
| 288 | se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr); |
| 289 | } |
| 290 | EXPORT_SYMBOL(__transport_register_session); |
| 291 | |
| 292 | void transport_register_session( |
| 293 | struct se_portal_group *se_tpg, |
| 294 | struct se_node_acl *se_nacl, |
| 295 | struct se_session *se_sess, |
| 296 | void *fabric_sess_ptr) |
| 297 | { |
| 298 | unsigned long flags; |
| 299 | |
| 300 | spin_lock_irqsave(&se_tpg->session_lock, flags); |
| 301 | __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr); |
| 302 | spin_unlock_irqrestore(&se_tpg->session_lock, flags); |
| 303 | } |
| 304 | EXPORT_SYMBOL(transport_register_session); |
| 305 | |
| 306 | void target_release_session(struct kref *kref) |
| 307 | { |
| 308 | struct se_session *se_sess = container_of(kref, |
| 309 | struct se_session, sess_kref); |
| 310 | struct se_portal_group *se_tpg = se_sess->se_tpg; |
| 311 | |
| 312 | se_tpg->se_tpg_tfo->close_session(se_sess); |
| 313 | } |
| 314 | |
| 315 | void target_get_session(struct se_session *se_sess) |
| 316 | { |
| 317 | kref_get(&se_sess->sess_kref); |
| 318 | } |
| 319 | EXPORT_SYMBOL(target_get_session); |
| 320 | |
| 321 | void target_put_session(struct se_session *se_sess) |
| 322 | { |
| 323 | struct se_portal_group *tpg = se_sess->se_tpg; |
| 324 | |
| 325 | if (tpg->se_tpg_tfo->put_session != NULL) { |
| 326 | tpg->se_tpg_tfo->put_session(se_sess); |
| 327 | return; |
| 328 | } |
| 329 | kref_put(&se_sess->sess_kref, target_release_session); |
| 330 | } |
| 331 | EXPORT_SYMBOL(target_put_session); |
| 332 | |
| 333 | static void target_complete_nacl(struct kref *kref) |
| 334 | { |
| 335 | struct se_node_acl *nacl = container_of(kref, |
| 336 | struct se_node_acl, acl_kref); |
| 337 | |
| 338 | complete(&nacl->acl_free_comp); |
| 339 | } |
| 340 | |
| 341 | void target_put_nacl(struct se_node_acl *nacl) |
| 342 | { |
| 343 | kref_put(&nacl->acl_kref, target_complete_nacl); |
| 344 | } |
| 345 | |
| 346 | void transport_deregister_session_configfs(struct se_session *se_sess) |
| 347 | { |
| 348 | struct se_node_acl *se_nacl; |
| 349 | unsigned long flags; |
| 350 | /* |
| 351 | * Used by struct se_node_acl's under ConfigFS to locate active struct se_session |
| 352 | */ |
| 353 | se_nacl = se_sess->se_node_acl; |
| 354 | if (se_nacl) { |
| 355 | spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags); |
| 356 | if (se_nacl->acl_stop == 0) |
| 357 | list_del(&se_sess->sess_acl_list); |
| 358 | /* |
| 359 | * If the session list is empty, then clear the pointer. |
| 360 | * Otherwise, set the struct se_session pointer from the tail |
| 361 | * element of the per struct se_node_acl active session list. |
| 362 | */ |
| 363 | if (list_empty(&se_nacl->acl_sess_list)) |
| 364 | se_nacl->nacl_sess = NULL; |
| 365 | else { |
| 366 | se_nacl->nacl_sess = container_of( |
| 367 | se_nacl->acl_sess_list.prev, |
| 368 | struct se_session, sess_acl_list); |
| 369 | } |
| 370 | spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags); |
| 371 | } |
| 372 | } |
| 373 | EXPORT_SYMBOL(transport_deregister_session_configfs); |
| 374 | |
| 375 | void transport_free_session(struct se_session *se_sess) |
| 376 | { |
| 377 | kmem_cache_free(se_sess_cache, se_sess); |
| 378 | } |
| 379 | EXPORT_SYMBOL(transport_free_session); |
| 380 | |
| 381 | void transport_deregister_session(struct se_session *se_sess) |
| 382 | { |
| 383 | struct se_portal_group *se_tpg = se_sess->se_tpg; |
| 384 | struct target_core_fabric_ops *se_tfo; |
| 385 | struct se_node_acl *se_nacl; |
| 386 | unsigned long flags; |
| 387 | bool comp_nacl = true; |
| 388 | |
| 389 | if (!se_tpg) { |
| 390 | transport_free_session(se_sess); |
| 391 | return; |
| 392 | } |
| 393 | se_tfo = se_tpg->se_tpg_tfo; |
| 394 | |
| 395 | spin_lock_irqsave(&se_tpg->session_lock, flags); |
| 396 | list_del(&se_sess->sess_list); |
| 397 | se_sess->se_tpg = NULL; |
| 398 | se_sess->fabric_sess_ptr = NULL; |
| 399 | spin_unlock_irqrestore(&se_tpg->session_lock, flags); |
| 400 | |
| 401 | /* |
| 402 | * Determine if we need to do extra work for this initiator node's |
| 403 | * struct se_node_acl if it had been previously dynamically generated. |
| 404 | */ |
| 405 | se_nacl = se_sess->se_node_acl; |
| 406 | |
| 407 | spin_lock_irqsave(&se_tpg->acl_node_lock, flags); |
| 408 | if (se_nacl && se_nacl->dynamic_node_acl) { |
| 409 | if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) { |
| 410 | list_del(&se_nacl->acl_list); |
| 411 | se_tpg->num_node_acls--; |
| 412 | spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags); |
| 413 | core_tpg_wait_for_nacl_pr_ref(se_nacl); |
| 414 | core_free_device_list_for_node(se_nacl, se_tpg); |
| 415 | se_tfo->tpg_release_fabric_acl(se_tpg, se_nacl); |
| 416 | |
| 417 | comp_nacl = false; |
| 418 | spin_lock_irqsave(&se_tpg->acl_node_lock, flags); |
| 419 | } |
| 420 | } |
| 421 | spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags); |
| 422 | |
| 423 | pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n", |
| 424 | se_tpg->se_tpg_tfo->get_fabric_name()); |
| 425 | /* |
| 426 | * If last kref is dropping now for an explict NodeACL, awake sleeping |
| 427 | * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group |
| 428 | * removal context. |
| 429 | */ |
| 430 | if (se_nacl && comp_nacl == true) |
| 431 | target_put_nacl(se_nacl); |
| 432 | |
| 433 | transport_free_session(se_sess); |
| 434 | } |
| 435 | EXPORT_SYMBOL(transport_deregister_session); |
| 436 | |
| 437 | /* |
| 438 | * Called with cmd->t_state_lock held. |
| 439 | */ |
| 440 | static void target_remove_from_state_list(struct se_cmd *cmd) |
| 441 | { |
| 442 | struct se_device *dev = cmd->se_dev; |
| 443 | unsigned long flags; |
| 444 | |
| 445 | if (!dev) |
| 446 | return; |
| 447 | |
| 448 | if (cmd->transport_state & CMD_T_BUSY) |
| 449 | return; |
| 450 | |
| 451 | spin_lock_irqsave(&dev->execute_task_lock, flags); |
| 452 | if (cmd->state_active) { |
| 453 | list_del(&cmd->state_list); |
| 454 | cmd->state_active = false; |
| 455 | } |
| 456 | spin_unlock_irqrestore(&dev->execute_task_lock, flags); |
| 457 | } |
| 458 | |
| 459 | static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists) |
| 460 | { |
| 461 | unsigned long flags; |
| 462 | |
| 463 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
| 464 | /* |
| 465 | * Determine if IOCTL context caller in requesting the stopping of this |
| 466 | * command for LUN shutdown purposes. |
| 467 | */ |
| 468 | if (cmd->transport_state & CMD_T_LUN_STOP) { |
| 469 | pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n", |
| 470 | __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd)); |
| 471 | |
| 472 | cmd->transport_state &= ~CMD_T_ACTIVE; |
| 473 | if (remove_from_lists) |
| 474 | target_remove_from_state_list(cmd); |
| 475 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
| 476 | |
| 477 | complete(&cmd->transport_lun_stop_comp); |
| 478 | return 1; |
| 479 | } |
| 480 | |
| 481 | if (remove_from_lists) { |
| 482 | target_remove_from_state_list(cmd); |
| 483 | |
| 484 | /* |
| 485 | * Clear struct se_cmd->se_lun before the handoff to FE. |
| 486 | */ |
| 487 | cmd->se_lun = NULL; |
| 488 | } |
| 489 | |
| 490 | /* |
| 491 | * Determine if frontend context caller is requesting the stopping of |
| 492 | * this command for frontend exceptions. |
| 493 | */ |
| 494 | if (cmd->transport_state & CMD_T_STOP) { |
| 495 | pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n", |
| 496 | __func__, __LINE__, |
| 497 | cmd->se_tfo->get_task_tag(cmd)); |
| 498 | |
| 499 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
| 500 | |
| 501 | complete(&cmd->t_transport_stop_comp); |
| 502 | return 1; |
| 503 | } |
| 504 | |
| 505 | cmd->transport_state &= ~CMD_T_ACTIVE; |
| 506 | if (remove_from_lists) { |
| 507 | /* |
| 508 | * Some fabric modules like tcm_loop can release |
| 509 | * their internally allocated I/O reference now and |
| 510 | * struct se_cmd now. |
| 511 | * |
| 512 | * Fabric modules are expected to return '1' here if the |
| 513 | * se_cmd being passed is released at this point, |
| 514 | * or zero if not being released. |
| 515 | */ |
| 516 | if (cmd->se_tfo->check_stop_free != NULL) { |
| 517 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
| 518 | return cmd->se_tfo->check_stop_free(cmd); |
| 519 | } |
| 520 | } |
| 521 | |
| 522 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
| 523 | return 0; |
| 524 | } |
| 525 | |
| 526 | static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd) |
| 527 | { |
| 528 | return transport_cmd_check_stop(cmd, true); |
| 529 | } |
| 530 | |
| 531 | static void transport_lun_remove_cmd(struct se_cmd *cmd) |
| 532 | { |
| 533 | struct se_lun *lun = cmd->se_lun; |
| 534 | unsigned long flags; |
| 535 | |
| 536 | if (!lun) |
| 537 | return; |
| 538 | |
| 539 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
| 540 | if (cmd->transport_state & CMD_T_DEV_ACTIVE) { |
| 541 | cmd->transport_state &= ~CMD_T_DEV_ACTIVE; |
| 542 | target_remove_from_state_list(cmd); |
| 543 | } |
| 544 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
| 545 | |
| 546 | spin_lock_irqsave(&lun->lun_cmd_lock, flags); |
| 547 | if (!list_empty(&cmd->se_lun_node)) |
| 548 | list_del_init(&cmd->se_lun_node); |
| 549 | spin_unlock_irqrestore(&lun->lun_cmd_lock, flags); |
| 550 | } |
| 551 | |
| 552 | void transport_cmd_finish_abort(struct se_cmd *cmd, int remove) |
| 553 | { |
| 554 | if (!(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) |
| 555 | transport_lun_remove_cmd(cmd); |
| 556 | |
| 557 | if (transport_cmd_check_stop_to_fabric(cmd)) |
| 558 | return; |
| 559 | if (remove) |
| 560 | transport_put_cmd(cmd); |
| 561 | } |
| 562 | |
| 563 | static void target_complete_failure_work(struct work_struct *work) |
| 564 | { |
| 565 | struct se_cmd *cmd = container_of(work, struct se_cmd, work); |
| 566 | |
| 567 | transport_generic_request_failure(cmd); |
| 568 | } |
| 569 | |
| 570 | void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status) |
| 571 | { |
| 572 | struct se_device *dev = cmd->se_dev; |
| 573 | int success = scsi_status == GOOD; |
| 574 | unsigned long flags; |
| 575 | |
| 576 | cmd->scsi_status = scsi_status; |
| 577 | |
| 578 | |
| 579 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
| 580 | cmd->transport_state &= ~CMD_T_BUSY; |
| 581 | |
| 582 | if (dev && dev->transport->transport_complete) { |
| 583 | if (dev->transport->transport_complete(cmd, |
| 584 | cmd->t_data_sg) != 0) { |
| 585 | cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE; |
| 586 | success = 1; |
| 587 | } |
| 588 | } |
| 589 | |
| 590 | /* |
| 591 | * See if we are waiting to complete for an exception condition. |
| 592 | */ |
| 593 | if (cmd->transport_state & CMD_T_REQUEST_STOP) { |
| 594 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
| 595 | complete(&cmd->task_stop_comp); |
| 596 | return; |
| 597 | } |
| 598 | |
| 599 | if (!success) |
| 600 | cmd->transport_state |= CMD_T_FAILED; |
| 601 | |
| 602 | /* |
| 603 | * Check for case where an explict ABORT_TASK has been received |
| 604 | * and transport_wait_for_tasks() will be waiting for completion.. |
| 605 | */ |
| 606 | if (cmd->transport_state & CMD_T_ABORTED && |
| 607 | cmd->transport_state & CMD_T_STOP) { |
| 608 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
| 609 | complete(&cmd->t_transport_stop_comp); |
| 610 | return; |
| 611 | } else if (cmd->transport_state & CMD_T_FAILED) { |
| 612 | cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
| 613 | INIT_WORK(&cmd->work, target_complete_failure_work); |
| 614 | } else { |
| 615 | INIT_WORK(&cmd->work, target_complete_ok_work); |
| 616 | } |
| 617 | |
| 618 | cmd->t_state = TRANSPORT_COMPLETE; |
| 619 | cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE); |
| 620 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
| 621 | |
| 622 | queue_work(target_completion_wq, &cmd->work); |
| 623 | } |
| 624 | EXPORT_SYMBOL(target_complete_cmd); |
| 625 | |
| 626 | static void target_add_to_state_list(struct se_cmd *cmd) |
| 627 | { |
| 628 | struct se_device *dev = cmd->se_dev; |
| 629 | unsigned long flags; |
| 630 | |
| 631 | spin_lock_irqsave(&dev->execute_task_lock, flags); |
| 632 | if (!cmd->state_active) { |
| 633 | list_add_tail(&cmd->state_list, &dev->state_list); |
| 634 | cmd->state_active = true; |
| 635 | } |
| 636 | spin_unlock_irqrestore(&dev->execute_task_lock, flags); |
| 637 | } |
| 638 | |
| 639 | /* |
| 640 | * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status |
| 641 | */ |
| 642 | static void transport_write_pending_qf(struct se_cmd *cmd); |
| 643 | static void transport_complete_qf(struct se_cmd *cmd); |
| 644 | |
| 645 | static void target_qf_do_work(struct work_struct *work) |
| 646 | { |
| 647 | struct se_device *dev = container_of(work, struct se_device, |
| 648 | qf_work_queue); |
| 649 | LIST_HEAD(qf_cmd_list); |
| 650 | struct se_cmd *cmd, *cmd_tmp; |
| 651 | |
| 652 | spin_lock_irq(&dev->qf_cmd_lock); |
| 653 | list_splice_init(&dev->qf_cmd_list, &qf_cmd_list); |
| 654 | spin_unlock_irq(&dev->qf_cmd_lock); |
| 655 | |
| 656 | list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) { |
| 657 | list_del(&cmd->se_qf_node); |
| 658 | atomic_dec(&dev->dev_qf_count); |
| 659 | smp_mb__after_atomic_dec(); |
| 660 | |
| 661 | pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue" |
| 662 | " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd, |
| 663 | (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" : |
| 664 | (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING" |
| 665 | : "UNKNOWN"); |
| 666 | |
| 667 | if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) |
| 668 | transport_write_pending_qf(cmd); |
| 669 | else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) |
| 670 | transport_complete_qf(cmd); |
| 671 | } |
| 672 | } |
| 673 | |
| 674 | unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd) |
| 675 | { |
| 676 | switch (cmd->data_direction) { |
| 677 | case DMA_NONE: |
| 678 | return "NONE"; |
| 679 | case DMA_FROM_DEVICE: |
| 680 | return "READ"; |
| 681 | case DMA_TO_DEVICE: |
| 682 | return "WRITE"; |
| 683 | case DMA_BIDIRECTIONAL: |
| 684 | return "BIDI"; |
| 685 | default: |
| 686 | break; |
| 687 | } |
| 688 | |
| 689 | return "UNKNOWN"; |
| 690 | } |
| 691 | |
| 692 | void transport_dump_dev_state( |
| 693 | struct se_device *dev, |
| 694 | char *b, |
| 695 | int *bl) |
| 696 | { |
| 697 | *bl += sprintf(b + *bl, "Status: "); |
| 698 | switch (dev->dev_status) { |
| 699 | case TRANSPORT_DEVICE_ACTIVATED: |
| 700 | *bl += sprintf(b + *bl, "ACTIVATED"); |
| 701 | break; |
| 702 | case TRANSPORT_DEVICE_DEACTIVATED: |
| 703 | *bl += sprintf(b + *bl, "DEACTIVATED"); |
| 704 | break; |
| 705 | case TRANSPORT_DEVICE_SHUTDOWN: |
| 706 | *bl += sprintf(b + *bl, "SHUTDOWN"); |
| 707 | break; |
| 708 | case TRANSPORT_DEVICE_OFFLINE_ACTIVATED: |
| 709 | case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED: |
| 710 | *bl += sprintf(b + *bl, "OFFLINE"); |
| 711 | break; |
| 712 | default: |
| 713 | *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status); |
| 714 | break; |
| 715 | } |
| 716 | |
| 717 | *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth); |
| 718 | *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n", |
| 719 | dev->se_sub_dev->se_dev_attrib.block_size, |
| 720 | dev->se_sub_dev->se_dev_attrib.hw_max_sectors); |
| 721 | *bl += sprintf(b + *bl, " "); |
| 722 | } |
| 723 | |
| 724 | void transport_dump_vpd_proto_id( |
| 725 | struct t10_vpd *vpd, |
| 726 | unsigned char *p_buf, |
| 727 | int p_buf_len) |
| 728 | { |
| 729 | unsigned char buf[VPD_TMP_BUF_SIZE]; |
| 730 | int len; |
| 731 | |
| 732 | memset(buf, 0, VPD_TMP_BUF_SIZE); |
| 733 | len = sprintf(buf, "T10 VPD Protocol Identifier: "); |
| 734 | |
| 735 | switch (vpd->protocol_identifier) { |
| 736 | case 0x00: |
| 737 | sprintf(buf+len, "Fibre Channel\n"); |
| 738 | break; |
| 739 | case 0x10: |
| 740 | sprintf(buf+len, "Parallel SCSI\n"); |
| 741 | break; |
| 742 | case 0x20: |
| 743 | sprintf(buf+len, "SSA\n"); |
| 744 | break; |
| 745 | case 0x30: |
| 746 | sprintf(buf+len, "IEEE 1394\n"); |
| 747 | break; |
| 748 | case 0x40: |
| 749 | sprintf(buf+len, "SCSI Remote Direct Memory Access" |
| 750 | " Protocol\n"); |
| 751 | break; |
| 752 | case 0x50: |
| 753 | sprintf(buf+len, "Internet SCSI (iSCSI)\n"); |
| 754 | break; |
| 755 | case 0x60: |
| 756 | sprintf(buf+len, "SAS Serial SCSI Protocol\n"); |
| 757 | break; |
| 758 | case 0x70: |
| 759 | sprintf(buf+len, "Automation/Drive Interface Transport" |
| 760 | " Protocol\n"); |
| 761 | break; |
| 762 | case 0x80: |
| 763 | sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n"); |
| 764 | break; |
| 765 | default: |
| 766 | sprintf(buf+len, "Unknown 0x%02x\n", |
| 767 | vpd->protocol_identifier); |
| 768 | break; |
| 769 | } |
| 770 | |
| 771 | if (p_buf) |
| 772 | strncpy(p_buf, buf, p_buf_len); |
| 773 | else |
| 774 | pr_debug("%s", buf); |
| 775 | } |
| 776 | |
| 777 | void |
| 778 | transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83) |
| 779 | { |
| 780 | /* |
| 781 | * Check if the Protocol Identifier Valid (PIV) bit is set.. |
| 782 | * |
| 783 | * from spc3r23.pdf section 7.5.1 |
| 784 | */ |
| 785 | if (page_83[1] & 0x80) { |
| 786 | vpd->protocol_identifier = (page_83[0] & 0xf0); |
| 787 | vpd->protocol_identifier_set = 1; |
| 788 | transport_dump_vpd_proto_id(vpd, NULL, 0); |
| 789 | } |
| 790 | } |
| 791 | EXPORT_SYMBOL(transport_set_vpd_proto_id); |
| 792 | |
| 793 | int transport_dump_vpd_assoc( |
| 794 | struct t10_vpd *vpd, |
| 795 | unsigned char *p_buf, |
| 796 | int p_buf_len) |
| 797 | { |
| 798 | unsigned char buf[VPD_TMP_BUF_SIZE]; |
| 799 | int ret = 0; |
| 800 | int len; |
| 801 | |
| 802 | memset(buf, 0, VPD_TMP_BUF_SIZE); |
| 803 | len = sprintf(buf, "T10 VPD Identifier Association: "); |
| 804 | |
| 805 | switch (vpd->association) { |
| 806 | case 0x00: |
| 807 | sprintf(buf+len, "addressed logical unit\n"); |
| 808 | break; |
| 809 | case 0x10: |
| 810 | sprintf(buf+len, "target port\n"); |
| 811 | break; |
| 812 | case 0x20: |
| 813 | sprintf(buf+len, "SCSI target device\n"); |
| 814 | break; |
| 815 | default: |
| 816 | sprintf(buf+len, "Unknown 0x%02x\n", vpd->association); |
| 817 | ret = -EINVAL; |
| 818 | break; |
| 819 | } |
| 820 | |
| 821 | if (p_buf) |
| 822 | strncpy(p_buf, buf, p_buf_len); |
| 823 | else |
| 824 | pr_debug("%s", buf); |
| 825 | |
| 826 | return ret; |
| 827 | } |
| 828 | |
| 829 | int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83) |
| 830 | { |
| 831 | /* |
| 832 | * The VPD identification association.. |
| 833 | * |
| 834 | * from spc3r23.pdf Section 7.6.3.1 Table 297 |
| 835 | */ |
| 836 | vpd->association = (page_83[1] & 0x30); |
| 837 | return transport_dump_vpd_assoc(vpd, NULL, 0); |
| 838 | } |
| 839 | EXPORT_SYMBOL(transport_set_vpd_assoc); |
| 840 | |
| 841 | int transport_dump_vpd_ident_type( |
| 842 | struct t10_vpd *vpd, |
| 843 | unsigned char *p_buf, |
| 844 | int p_buf_len) |
| 845 | { |
| 846 | unsigned char buf[VPD_TMP_BUF_SIZE]; |
| 847 | int ret = 0; |
| 848 | int len; |
| 849 | |
| 850 | memset(buf, 0, VPD_TMP_BUF_SIZE); |
| 851 | len = sprintf(buf, "T10 VPD Identifier Type: "); |
| 852 | |
| 853 | switch (vpd->device_identifier_type) { |
| 854 | case 0x00: |
| 855 | sprintf(buf+len, "Vendor specific\n"); |
| 856 | break; |
| 857 | case 0x01: |
| 858 | sprintf(buf+len, "T10 Vendor ID based\n"); |
| 859 | break; |
| 860 | case 0x02: |
| 861 | sprintf(buf+len, "EUI-64 based\n"); |
| 862 | break; |
| 863 | case 0x03: |
| 864 | sprintf(buf+len, "NAA\n"); |
| 865 | break; |
| 866 | case 0x04: |
| 867 | sprintf(buf+len, "Relative target port identifier\n"); |
| 868 | break; |
| 869 | case 0x08: |
| 870 | sprintf(buf+len, "SCSI name string\n"); |
| 871 | break; |
| 872 | default: |
| 873 | sprintf(buf+len, "Unsupported: 0x%02x\n", |
| 874 | vpd->device_identifier_type); |
| 875 | ret = -EINVAL; |
| 876 | break; |
| 877 | } |
| 878 | |
| 879 | if (p_buf) { |
| 880 | if (p_buf_len < strlen(buf)+1) |
| 881 | return -EINVAL; |
| 882 | strncpy(p_buf, buf, p_buf_len); |
| 883 | } else { |
| 884 | pr_debug("%s", buf); |
| 885 | } |
| 886 | |
| 887 | return ret; |
| 888 | } |
| 889 | |
| 890 | int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83) |
| 891 | { |
| 892 | /* |
| 893 | * The VPD identifier type.. |
| 894 | * |
| 895 | * from spc3r23.pdf Section 7.6.3.1 Table 298 |
| 896 | */ |
| 897 | vpd->device_identifier_type = (page_83[1] & 0x0f); |
| 898 | return transport_dump_vpd_ident_type(vpd, NULL, 0); |
| 899 | } |
| 900 | EXPORT_SYMBOL(transport_set_vpd_ident_type); |
| 901 | |
| 902 | int transport_dump_vpd_ident( |
| 903 | struct t10_vpd *vpd, |
| 904 | unsigned char *p_buf, |
| 905 | int p_buf_len) |
| 906 | { |
| 907 | unsigned char buf[VPD_TMP_BUF_SIZE]; |
| 908 | int ret = 0; |
| 909 | |
| 910 | memset(buf, 0, VPD_TMP_BUF_SIZE); |
| 911 | |
| 912 | switch (vpd->device_identifier_code_set) { |
| 913 | case 0x01: /* Binary */ |
| 914 | sprintf(buf, "T10 VPD Binary Device Identifier: %s\n", |
| 915 | &vpd->device_identifier[0]); |
| 916 | break; |
| 917 | case 0x02: /* ASCII */ |
| 918 | sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n", |
| 919 | &vpd->device_identifier[0]); |
| 920 | break; |
| 921 | case 0x03: /* UTF-8 */ |
| 922 | sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n", |
| 923 | &vpd->device_identifier[0]); |
| 924 | break; |
| 925 | default: |
| 926 | sprintf(buf, "T10 VPD Device Identifier encoding unsupported:" |
| 927 | " 0x%02x", vpd->device_identifier_code_set); |
| 928 | ret = -EINVAL; |
| 929 | break; |
| 930 | } |
| 931 | |
| 932 | if (p_buf) |
| 933 | strncpy(p_buf, buf, p_buf_len); |
| 934 | else |
| 935 | pr_debug("%s", buf); |
| 936 | |
| 937 | return ret; |
| 938 | } |
| 939 | |
| 940 | int |
| 941 | transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83) |
| 942 | { |
| 943 | static const char hex_str[] = "0123456789abcdef"; |
| 944 | int j = 0, i = 4; /* offset to start of the identifer */ |
| 945 | |
| 946 | /* |
| 947 | * The VPD Code Set (encoding) |
| 948 | * |
| 949 | * from spc3r23.pdf Section 7.6.3.1 Table 296 |
| 950 | */ |
| 951 | vpd->device_identifier_code_set = (page_83[0] & 0x0f); |
| 952 | switch (vpd->device_identifier_code_set) { |
| 953 | case 0x01: /* Binary */ |
| 954 | vpd->device_identifier[j++] = |
| 955 | hex_str[vpd->device_identifier_type]; |
| 956 | while (i < (4 + page_83[3])) { |
| 957 | vpd->device_identifier[j++] = |
| 958 | hex_str[(page_83[i] & 0xf0) >> 4]; |
| 959 | vpd->device_identifier[j++] = |
| 960 | hex_str[page_83[i] & 0x0f]; |
| 961 | i++; |
| 962 | } |
| 963 | break; |
| 964 | case 0x02: /* ASCII */ |
| 965 | case 0x03: /* UTF-8 */ |
| 966 | while (i < (4 + page_83[3])) |
| 967 | vpd->device_identifier[j++] = page_83[i++]; |
| 968 | break; |
| 969 | default: |
| 970 | break; |
| 971 | } |
| 972 | |
| 973 | return transport_dump_vpd_ident(vpd, NULL, 0); |
| 974 | } |
| 975 | EXPORT_SYMBOL(transport_set_vpd_ident); |
| 976 | |
| 977 | static void core_setup_task_attr_emulation(struct se_device *dev) |
| 978 | { |
| 979 | /* |
| 980 | * If this device is from Target_Core_Mod/pSCSI, disable the |
| 981 | * SAM Task Attribute emulation. |
| 982 | * |
| 983 | * This is currently not available in upsream Linux/SCSI Target |
| 984 | * mode code, and is assumed to be disabled while using TCM/pSCSI. |
| 985 | */ |
| 986 | if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) { |
| 987 | dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH; |
| 988 | return; |
| 989 | } |
| 990 | |
| 991 | dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED; |
| 992 | pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x" |
| 993 | " device\n", dev->transport->name, |
| 994 | dev->transport->get_device_rev(dev)); |
| 995 | } |
| 996 | |
| 997 | static void scsi_dump_inquiry(struct se_device *dev) |
| 998 | { |
| 999 | struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn; |
| 1000 | char buf[17]; |
| 1001 | int i, device_type; |
| 1002 | /* |
| 1003 | * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer |
| 1004 | */ |
| 1005 | for (i = 0; i < 8; i++) |
| 1006 | if (wwn->vendor[i] >= 0x20) |
| 1007 | buf[i] = wwn->vendor[i]; |
| 1008 | else |
| 1009 | buf[i] = ' '; |
| 1010 | buf[i] = '\0'; |
| 1011 | pr_debug(" Vendor: %s\n", buf); |
| 1012 | |
| 1013 | for (i = 0; i < 16; i++) |
| 1014 | if (wwn->model[i] >= 0x20) |
| 1015 | buf[i] = wwn->model[i]; |
| 1016 | else |
| 1017 | buf[i] = ' '; |
| 1018 | buf[i] = '\0'; |
| 1019 | pr_debug(" Model: %s\n", buf); |
| 1020 | |
| 1021 | for (i = 0; i < 4; i++) |
| 1022 | if (wwn->revision[i] >= 0x20) |
| 1023 | buf[i] = wwn->revision[i]; |
| 1024 | else |
| 1025 | buf[i] = ' '; |
| 1026 | buf[i] = '\0'; |
| 1027 | pr_debug(" Revision: %s\n", buf); |
| 1028 | |
| 1029 | device_type = dev->transport->get_device_type(dev); |
| 1030 | pr_debug(" Type: %s ", scsi_device_type(device_type)); |
| 1031 | pr_debug(" ANSI SCSI revision: %02x\n", |
| 1032 | dev->transport->get_device_rev(dev)); |
| 1033 | } |
| 1034 | |
| 1035 | struct se_device *transport_add_device_to_core_hba( |
| 1036 | struct se_hba *hba, |
| 1037 | struct se_subsystem_api *transport, |
| 1038 | struct se_subsystem_dev *se_dev, |
| 1039 | u32 device_flags, |
| 1040 | void *transport_dev, |
| 1041 | struct se_dev_limits *dev_limits, |
| 1042 | const char *inquiry_prod, |
| 1043 | const char *inquiry_rev) |
| 1044 | { |
| 1045 | int force_pt; |
| 1046 | struct se_device *dev; |
| 1047 | |
| 1048 | dev = kzalloc(sizeof(struct se_device), GFP_KERNEL); |
| 1049 | if (!dev) { |
| 1050 | pr_err("Unable to allocate memory for se_dev_t\n"); |
| 1051 | return NULL; |
| 1052 | } |
| 1053 | |
| 1054 | dev->dev_flags = device_flags; |
| 1055 | dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED; |
| 1056 | dev->dev_ptr = transport_dev; |
| 1057 | dev->se_hba = hba; |
| 1058 | dev->se_sub_dev = se_dev; |
| 1059 | dev->transport = transport; |
| 1060 | INIT_LIST_HEAD(&dev->dev_list); |
| 1061 | INIT_LIST_HEAD(&dev->dev_sep_list); |
| 1062 | INIT_LIST_HEAD(&dev->dev_tmr_list); |
| 1063 | INIT_LIST_HEAD(&dev->delayed_cmd_list); |
| 1064 | INIT_LIST_HEAD(&dev->state_list); |
| 1065 | INIT_LIST_HEAD(&dev->qf_cmd_list); |
| 1066 | spin_lock_init(&dev->execute_task_lock); |
| 1067 | spin_lock_init(&dev->delayed_cmd_lock); |
| 1068 | spin_lock_init(&dev->dev_reservation_lock); |
| 1069 | spin_lock_init(&dev->dev_status_lock); |
| 1070 | spin_lock_init(&dev->se_port_lock); |
| 1071 | spin_lock_init(&dev->se_tmr_lock); |
| 1072 | spin_lock_init(&dev->qf_cmd_lock); |
| 1073 | atomic_set(&dev->dev_ordered_id, 0); |
| 1074 | |
| 1075 | se_dev_set_default_attribs(dev, dev_limits); |
| 1076 | |
| 1077 | dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX); |
| 1078 | dev->creation_time = get_jiffies_64(); |
| 1079 | spin_lock_init(&dev->stats_lock); |
| 1080 | |
| 1081 | spin_lock(&hba->device_lock); |
| 1082 | list_add_tail(&dev->dev_list, &hba->hba_dev_list); |
| 1083 | hba->dev_count++; |
| 1084 | spin_unlock(&hba->device_lock); |
| 1085 | /* |
| 1086 | * Setup the SAM Task Attribute emulation for struct se_device |
| 1087 | */ |
| 1088 | core_setup_task_attr_emulation(dev); |
| 1089 | /* |
| 1090 | * Force PR and ALUA passthrough emulation with internal object use. |
| 1091 | */ |
| 1092 | force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE); |
| 1093 | /* |
| 1094 | * Setup the Reservations infrastructure for struct se_device |
| 1095 | */ |
| 1096 | core_setup_reservations(dev, force_pt); |
| 1097 | /* |
| 1098 | * Setup the Asymmetric Logical Unit Assignment for struct se_device |
| 1099 | */ |
| 1100 | if (core_setup_alua(dev, force_pt) < 0) |
| 1101 | goto err_dev_list; |
| 1102 | |
| 1103 | /* |
| 1104 | * Startup the struct se_device processing thread |
| 1105 | */ |
| 1106 | dev->tmr_wq = alloc_workqueue("tmr-%s", WQ_MEM_RECLAIM | WQ_UNBOUND, 1, |
| 1107 | dev->transport->name); |
| 1108 | if (!dev->tmr_wq) { |
| 1109 | pr_err("Unable to create tmr workqueue for %s\n", |
| 1110 | dev->transport->name); |
| 1111 | goto err_dev_list; |
| 1112 | } |
| 1113 | /* |
| 1114 | * Setup work_queue for QUEUE_FULL |
| 1115 | */ |
| 1116 | INIT_WORK(&dev->qf_work_queue, target_qf_do_work); |
| 1117 | /* |
| 1118 | * Preload the initial INQUIRY const values if we are doing |
| 1119 | * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI |
| 1120 | * passthrough because this is being provided by the backend LLD. |
| 1121 | * This is required so that transport_get_inquiry() copies these |
| 1122 | * originals once back into DEV_T10_WWN(dev) for the virtual device |
| 1123 | * setup. |
| 1124 | */ |
| 1125 | if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) { |
| 1126 | if (!inquiry_prod || !inquiry_rev) { |
| 1127 | pr_err("All non TCM/pSCSI plugins require" |
| 1128 | " INQUIRY consts\n"); |
| 1129 | goto err_wq; |
| 1130 | } |
| 1131 | |
| 1132 | strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8); |
| 1133 | strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16); |
| 1134 | strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4); |
| 1135 | } |
| 1136 | scsi_dump_inquiry(dev); |
| 1137 | |
| 1138 | return dev; |
| 1139 | |
| 1140 | err_wq: |
| 1141 | destroy_workqueue(dev->tmr_wq); |
| 1142 | err_dev_list: |
| 1143 | spin_lock(&hba->device_lock); |
| 1144 | list_del(&dev->dev_list); |
| 1145 | hba->dev_count--; |
| 1146 | spin_unlock(&hba->device_lock); |
| 1147 | |
| 1148 | se_release_vpd_for_dev(dev); |
| 1149 | |
| 1150 | kfree(dev); |
| 1151 | |
| 1152 | return NULL; |
| 1153 | } |
| 1154 | EXPORT_SYMBOL(transport_add_device_to_core_hba); |
| 1155 | |
| 1156 | int target_cmd_size_check(struct se_cmd *cmd, unsigned int size) |
| 1157 | { |
| 1158 | struct se_device *dev = cmd->se_dev; |
| 1159 | |
| 1160 | if (cmd->unknown_data_length) { |
| 1161 | cmd->data_length = size; |
| 1162 | } else if (size != cmd->data_length) { |
| 1163 | pr_warn("TARGET_CORE[%s]: Expected Transfer Length:" |
| 1164 | " %u does not match SCSI CDB Length: %u for SAM Opcode:" |
| 1165 | " 0x%02x\n", cmd->se_tfo->get_fabric_name(), |
| 1166 | cmd->data_length, size, cmd->t_task_cdb[0]); |
| 1167 | |
| 1168 | cmd->cmd_spdtl = size; |
| 1169 | |
| 1170 | if (cmd->data_direction == DMA_TO_DEVICE) { |
| 1171 | pr_err("Rejecting underflow/overflow" |
| 1172 | " WRITE data\n"); |
| 1173 | goto out_invalid_cdb_field; |
| 1174 | } |
| 1175 | /* |
| 1176 | * Reject READ_* or WRITE_* with overflow/underflow for |
| 1177 | * type SCF_SCSI_DATA_CDB. |
| 1178 | */ |
| 1179 | if (dev->se_sub_dev->se_dev_attrib.block_size != 512) { |
| 1180 | pr_err("Failing OVERFLOW/UNDERFLOW for LBA op" |
| 1181 | " CDB on non 512-byte sector setup subsystem" |
| 1182 | " plugin: %s\n", dev->transport->name); |
| 1183 | /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */ |
| 1184 | goto out_invalid_cdb_field; |
| 1185 | } |
| 1186 | |
| 1187 | if (size > cmd->data_length) { |
| 1188 | cmd->se_cmd_flags |= SCF_OVERFLOW_BIT; |
| 1189 | cmd->residual_count = (size - cmd->data_length); |
| 1190 | } else { |
| 1191 | cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT; |
| 1192 | cmd->residual_count = (cmd->data_length - size); |
| 1193 | } |
| 1194 | cmd->data_length = size; |
| 1195 | } |
| 1196 | |
| 1197 | return 0; |
| 1198 | |
| 1199 | out_invalid_cdb_field: |
| 1200 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; |
| 1201 | cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; |
| 1202 | return -EINVAL; |
| 1203 | } |
| 1204 | |
| 1205 | /* |
| 1206 | * Used by fabric modules containing a local struct se_cmd within their |
| 1207 | * fabric dependent per I/O descriptor. |
| 1208 | */ |
| 1209 | void transport_init_se_cmd( |
| 1210 | struct se_cmd *cmd, |
| 1211 | struct target_core_fabric_ops *tfo, |
| 1212 | struct se_session *se_sess, |
| 1213 | u32 data_length, |
| 1214 | int data_direction, |
| 1215 | int task_attr, |
| 1216 | unsigned char *sense_buffer) |
| 1217 | { |
| 1218 | INIT_LIST_HEAD(&cmd->se_lun_node); |
| 1219 | INIT_LIST_HEAD(&cmd->se_delayed_node); |
| 1220 | INIT_LIST_HEAD(&cmd->se_qf_node); |
| 1221 | INIT_LIST_HEAD(&cmd->se_cmd_list); |
| 1222 | INIT_LIST_HEAD(&cmd->state_list); |
| 1223 | init_completion(&cmd->transport_lun_fe_stop_comp); |
| 1224 | init_completion(&cmd->transport_lun_stop_comp); |
| 1225 | init_completion(&cmd->t_transport_stop_comp); |
| 1226 | init_completion(&cmd->cmd_wait_comp); |
| 1227 | init_completion(&cmd->task_stop_comp); |
| 1228 | spin_lock_init(&cmd->t_state_lock); |
| 1229 | cmd->transport_state = CMD_T_DEV_ACTIVE; |
| 1230 | |
| 1231 | cmd->se_tfo = tfo; |
| 1232 | cmd->se_sess = se_sess; |
| 1233 | cmd->data_length = data_length; |
| 1234 | cmd->data_direction = data_direction; |
| 1235 | cmd->sam_task_attr = task_attr; |
| 1236 | cmd->sense_buffer = sense_buffer; |
| 1237 | |
| 1238 | cmd->state_active = false; |
| 1239 | } |
| 1240 | EXPORT_SYMBOL(transport_init_se_cmd); |
| 1241 | |
| 1242 | static int transport_check_alloc_task_attr(struct se_cmd *cmd) |
| 1243 | { |
| 1244 | /* |
| 1245 | * Check if SAM Task Attribute emulation is enabled for this |
| 1246 | * struct se_device storage object |
| 1247 | */ |
| 1248 | if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) |
| 1249 | return 0; |
| 1250 | |
| 1251 | if (cmd->sam_task_attr == MSG_ACA_TAG) { |
| 1252 | pr_debug("SAM Task Attribute ACA" |
| 1253 | " emulation is not supported\n"); |
| 1254 | return -EINVAL; |
| 1255 | } |
| 1256 | /* |
| 1257 | * Used to determine when ORDERED commands should go from |
| 1258 | * Dormant to Active status. |
| 1259 | */ |
| 1260 | cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id); |
| 1261 | smp_mb__after_atomic_inc(); |
| 1262 | pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n", |
| 1263 | cmd->se_ordered_id, cmd->sam_task_attr, |
| 1264 | cmd->se_dev->transport->name); |
| 1265 | return 0; |
| 1266 | } |
| 1267 | |
| 1268 | /* target_setup_cmd_from_cdb(): |
| 1269 | * |
| 1270 | * Called from fabric RX Thread. |
| 1271 | */ |
| 1272 | int target_setup_cmd_from_cdb( |
| 1273 | struct se_cmd *cmd, |
| 1274 | unsigned char *cdb) |
| 1275 | { |
| 1276 | struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev; |
| 1277 | u32 pr_reg_type = 0; |
| 1278 | u8 alua_ascq = 0; |
| 1279 | unsigned long flags; |
| 1280 | int ret; |
| 1281 | |
| 1282 | /* |
| 1283 | * Ensure that the received CDB is less than the max (252 + 8) bytes |
| 1284 | * for VARIABLE_LENGTH_CMD |
| 1285 | */ |
| 1286 | if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) { |
| 1287 | pr_err("Received SCSI CDB with command_size: %d that" |
| 1288 | " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n", |
| 1289 | scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE); |
| 1290 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; |
| 1291 | cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; |
| 1292 | return -EINVAL; |
| 1293 | } |
| 1294 | /* |
| 1295 | * If the received CDB is larger than TCM_MAX_COMMAND_SIZE, |
| 1296 | * allocate the additional extended CDB buffer now.. Otherwise |
| 1297 | * setup the pointer from __t_task_cdb to t_task_cdb. |
| 1298 | */ |
| 1299 | if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) { |
| 1300 | cmd->t_task_cdb = kzalloc(scsi_command_size(cdb), |
| 1301 | GFP_KERNEL); |
| 1302 | if (!cmd->t_task_cdb) { |
| 1303 | pr_err("Unable to allocate cmd->t_task_cdb" |
| 1304 | " %u > sizeof(cmd->__t_task_cdb): %lu ops\n", |
| 1305 | scsi_command_size(cdb), |
| 1306 | (unsigned long)sizeof(cmd->__t_task_cdb)); |
| 1307 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; |
| 1308 | cmd->scsi_sense_reason = |
| 1309 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
| 1310 | return -ENOMEM; |
| 1311 | } |
| 1312 | } else |
| 1313 | cmd->t_task_cdb = &cmd->__t_task_cdb[0]; |
| 1314 | /* |
| 1315 | * Copy the original CDB into cmd-> |
| 1316 | */ |
| 1317 | memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb)); |
| 1318 | |
| 1319 | /* |
| 1320 | * Check for an existing UNIT ATTENTION condition |
| 1321 | */ |
| 1322 | if (core_scsi3_ua_check(cmd, cdb) < 0) { |
| 1323 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; |
| 1324 | cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION; |
| 1325 | return -EINVAL; |
| 1326 | } |
| 1327 | |
| 1328 | ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq); |
| 1329 | if (ret != 0) { |
| 1330 | /* |
| 1331 | * Set SCSI additional sense code (ASC) to 'LUN Not Accessible'; |
| 1332 | * The ALUA additional sense code qualifier (ASCQ) is determined |
| 1333 | * by the ALUA primary or secondary access state.. |
| 1334 | */ |
| 1335 | if (ret > 0) { |
| 1336 | pr_debug("[%s]: ALUA TG Port not available, " |
| 1337 | "SenseKey: NOT_READY, ASC/ASCQ: " |
| 1338 | "0x04/0x%02x\n", |
| 1339 | cmd->se_tfo->get_fabric_name(), alua_ascq); |
| 1340 | |
| 1341 | transport_set_sense_codes(cmd, 0x04, alua_ascq); |
| 1342 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; |
| 1343 | cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY; |
| 1344 | return -EINVAL; |
| 1345 | } |
| 1346 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; |
| 1347 | cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; |
| 1348 | return -EINVAL; |
| 1349 | } |
| 1350 | |
| 1351 | /* |
| 1352 | * Check status for SPC-3 Persistent Reservations |
| 1353 | */ |
| 1354 | if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type)) { |
| 1355 | if (su_dev->t10_pr.pr_ops.t10_seq_non_holder( |
| 1356 | cmd, cdb, pr_reg_type) != 0) { |
| 1357 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; |
| 1358 | cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT; |
| 1359 | cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT; |
| 1360 | cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; |
| 1361 | return -EBUSY; |
| 1362 | } |
| 1363 | /* |
| 1364 | * This means the CDB is allowed for the SCSI Initiator port |
| 1365 | * when said port is *NOT* holding the legacy SPC-2 or |
| 1366 | * SPC-3 Persistent Reservation. |
| 1367 | */ |
| 1368 | } |
| 1369 | |
| 1370 | ret = cmd->se_dev->transport->parse_cdb(cmd); |
| 1371 | if (ret < 0) |
| 1372 | return ret; |
| 1373 | |
| 1374 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
| 1375 | cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE; |
| 1376 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
| 1377 | |
| 1378 | /* |
| 1379 | * Check for SAM Task Attribute Emulation |
| 1380 | */ |
| 1381 | if (transport_check_alloc_task_attr(cmd) < 0) { |
| 1382 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; |
| 1383 | cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; |
| 1384 | return -EINVAL; |
| 1385 | } |
| 1386 | spin_lock(&cmd->se_lun->lun_sep_lock); |
| 1387 | if (cmd->se_lun->lun_sep) |
| 1388 | cmd->se_lun->lun_sep->sep_stats.cmd_pdus++; |
| 1389 | spin_unlock(&cmd->se_lun->lun_sep_lock); |
| 1390 | return 0; |
| 1391 | } |
| 1392 | EXPORT_SYMBOL(target_setup_cmd_from_cdb); |
| 1393 | |
| 1394 | /* |
| 1395 | * Used by fabric module frontends to queue tasks directly. |
| 1396 | * Many only be used from process context only |
| 1397 | */ |
| 1398 | int transport_handle_cdb_direct( |
| 1399 | struct se_cmd *cmd) |
| 1400 | { |
| 1401 | int ret; |
| 1402 | |
| 1403 | if (!cmd->se_lun) { |
| 1404 | dump_stack(); |
| 1405 | pr_err("cmd->se_lun is NULL\n"); |
| 1406 | return -EINVAL; |
| 1407 | } |
| 1408 | if (in_interrupt()) { |
| 1409 | dump_stack(); |
| 1410 | pr_err("transport_generic_handle_cdb cannot be called" |
| 1411 | " from interrupt context\n"); |
| 1412 | return -EINVAL; |
| 1413 | } |
| 1414 | /* |
| 1415 | * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that |
| 1416 | * outstanding descriptors are handled correctly during shutdown via |
| 1417 | * transport_wait_for_tasks() |
| 1418 | * |
| 1419 | * Also, we don't take cmd->t_state_lock here as we only expect |
| 1420 | * this to be called for initial descriptor submission. |
| 1421 | */ |
| 1422 | cmd->t_state = TRANSPORT_NEW_CMD; |
| 1423 | cmd->transport_state |= CMD_T_ACTIVE; |
| 1424 | |
| 1425 | /* |
| 1426 | * transport_generic_new_cmd() is already handling QUEUE_FULL, |
| 1427 | * so follow TRANSPORT_NEW_CMD processing thread context usage |
| 1428 | * and call transport_generic_request_failure() if necessary.. |
| 1429 | */ |
| 1430 | ret = transport_generic_new_cmd(cmd); |
| 1431 | if (ret < 0) |
| 1432 | transport_generic_request_failure(cmd); |
| 1433 | |
| 1434 | return 0; |
| 1435 | } |
| 1436 | EXPORT_SYMBOL(transport_handle_cdb_direct); |
| 1437 | |
| 1438 | /** |
| 1439 | * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd |
| 1440 | * |
| 1441 | * @se_cmd: command descriptor to submit |
| 1442 | * @se_sess: associated se_sess for endpoint |
| 1443 | * @cdb: pointer to SCSI CDB |
| 1444 | * @sense: pointer to SCSI sense buffer |
| 1445 | * @unpacked_lun: unpacked LUN to reference for struct se_lun |
| 1446 | * @data_length: fabric expected data transfer length |
| 1447 | * @task_addr: SAM task attribute |
| 1448 | * @data_dir: DMA data direction |
| 1449 | * @flags: flags for command submission from target_sc_flags_tables |
| 1450 | * |
| 1451 | * Returns non zero to signal active I/O shutdown failure. All other |
| 1452 | * setup exceptions will be returned as a SCSI CHECK_CONDITION response, |
| 1453 | * but still return zero here. |
| 1454 | * |
| 1455 | * This may only be called from process context, and also currently |
| 1456 | * assumes internal allocation of fabric payload buffer by target-core. |
| 1457 | **/ |
| 1458 | int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess, |
| 1459 | unsigned char *cdb, unsigned char *sense, u32 unpacked_lun, |
| 1460 | u32 data_length, int task_attr, int data_dir, int flags) |
| 1461 | { |
| 1462 | struct se_portal_group *se_tpg; |
| 1463 | int rc; |
| 1464 | |
| 1465 | se_tpg = se_sess->se_tpg; |
| 1466 | BUG_ON(!se_tpg); |
| 1467 | BUG_ON(se_cmd->se_tfo || se_cmd->se_sess); |
| 1468 | BUG_ON(in_interrupt()); |
| 1469 | /* |
| 1470 | * Initialize se_cmd for target operation. From this point |
| 1471 | * exceptions are handled by sending exception status via |
| 1472 | * target_core_fabric_ops->queue_status() callback |
| 1473 | */ |
| 1474 | transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, |
| 1475 | data_length, data_dir, task_attr, sense); |
| 1476 | if (flags & TARGET_SCF_UNKNOWN_SIZE) |
| 1477 | se_cmd->unknown_data_length = 1; |
| 1478 | /* |
| 1479 | * Obtain struct se_cmd->cmd_kref reference and add new cmd to |
| 1480 | * se_sess->sess_cmd_list. A second kref_get here is necessary |
| 1481 | * for fabrics using TARGET_SCF_ACK_KREF that expect a second |
| 1482 | * kref_put() to happen during fabric packet acknowledgement. |
| 1483 | */ |
| 1484 | rc = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF)); |
| 1485 | if (rc) |
| 1486 | return rc; |
| 1487 | /* |
| 1488 | * Signal bidirectional data payloads to target-core |
| 1489 | */ |
| 1490 | if (flags & TARGET_SCF_BIDI_OP) |
| 1491 | se_cmd->se_cmd_flags |= SCF_BIDI; |
| 1492 | /* |
| 1493 | * Locate se_lun pointer and attach it to struct se_cmd |
| 1494 | */ |
| 1495 | if (transport_lookup_cmd_lun(se_cmd, unpacked_lun) < 0) { |
| 1496 | transport_send_check_condition_and_sense(se_cmd, |
| 1497 | se_cmd->scsi_sense_reason, 0); |
| 1498 | target_put_sess_cmd(se_sess, se_cmd); |
| 1499 | return 0; |
| 1500 | } |
| 1501 | |
| 1502 | rc = target_setup_cmd_from_cdb(se_cmd, cdb); |
| 1503 | if (rc != 0) { |
| 1504 | transport_generic_request_failure(se_cmd); |
| 1505 | return 0; |
| 1506 | } |
| 1507 | |
| 1508 | /* |
| 1509 | * Check if we need to delay processing because of ALUA |
| 1510 | * Active/NonOptimized primary access state.. |
| 1511 | */ |
| 1512 | core_alua_check_nonop_delay(se_cmd); |
| 1513 | |
| 1514 | transport_handle_cdb_direct(se_cmd); |
| 1515 | return 0; |
| 1516 | } |
| 1517 | EXPORT_SYMBOL(target_submit_cmd); |
| 1518 | |
| 1519 | static void target_complete_tmr_failure(struct work_struct *work) |
| 1520 | { |
| 1521 | struct se_cmd *se_cmd = container_of(work, struct se_cmd, work); |
| 1522 | |
| 1523 | se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST; |
| 1524 | se_cmd->se_tfo->queue_tm_rsp(se_cmd); |
| 1525 | transport_generic_free_cmd(se_cmd, 0); |
| 1526 | } |
| 1527 | |
| 1528 | /** |
| 1529 | * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd |
| 1530 | * for TMR CDBs |
| 1531 | * |
| 1532 | * @se_cmd: command descriptor to submit |
| 1533 | * @se_sess: associated se_sess for endpoint |
| 1534 | * @sense: pointer to SCSI sense buffer |
| 1535 | * @unpacked_lun: unpacked LUN to reference for struct se_lun |
| 1536 | * @fabric_context: fabric context for TMR req |
| 1537 | * @tm_type: Type of TM request |
| 1538 | * @gfp: gfp type for caller |
| 1539 | * @tag: referenced task tag for TMR_ABORT_TASK |
| 1540 | * @flags: submit cmd flags |
| 1541 | * |
| 1542 | * Callable from all contexts. |
| 1543 | **/ |
| 1544 | |
| 1545 | int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess, |
| 1546 | unsigned char *sense, u32 unpacked_lun, |
| 1547 | void *fabric_tmr_ptr, unsigned char tm_type, |
| 1548 | gfp_t gfp, unsigned int tag, int flags) |
| 1549 | { |
| 1550 | struct se_portal_group *se_tpg; |
| 1551 | int ret; |
| 1552 | |
| 1553 | se_tpg = se_sess->se_tpg; |
| 1554 | BUG_ON(!se_tpg); |
| 1555 | |
| 1556 | transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, |
| 1557 | 0, DMA_NONE, MSG_SIMPLE_TAG, sense); |
| 1558 | /* |
| 1559 | * FIXME: Currently expect caller to handle se_cmd->se_tmr_req |
| 1560 | * allocation failure. |
| 1561 | */ |
| 1562 | ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp); |
| 1563 | if (ret < 0) |
| 1564 | return -ENOMEM; |
| 1565 | |
| 1566 | if (tm_type == TMR_ABORT_TASK) |
| 1567 | se_cmd->se_tmr_req->ref_task_tag = tag; |
| 1568 | |
| 1569 | /* See target_submit_cmd for commentary */ |
| 1570 | ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF)); |
| 1571 | if (ret) { |
| 1572 | core_tmr_release_req(se_cmd->se_tmr_req); |
| 1573 | return ret; |
| 1574 | } |
| 1575 | |
| 1576 | ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun); |
| 1577 | if (ret) { |
| 1578 | /* |
| 1579 | * For callback during failure handling, push this work off |
| 1580 | * to process context with TMR_LUN_DOES_NOT_EXIST status. |
| 1581 | */ |
| 1582 | INIT_WORK(&se_cmd->work, target_complete_tmr_failure); |
| 1583 | schedule_work(&se_cmd->work); |
| 1584 | return 0; |
| 1585 | } |
| 1586 | transport_generic_handle_tmr(se_cmd); |
| 1587 | return 0; |
| 1588 | } |
| 1589 | EXPORT_SYMBOL(target_submit_tmr); |
| 1590 | |
| 1591 | /* |
| 1592 | * If the cmd is active, request it to be stopped and sleep until it |
| 1593 | * has completed. |
| 1594 | */ |
| 1595 | bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags) |
| 1596 | { |
| 1597 | bool was_active = false; |
| 1598 | |
| 1599 | if (cmd->transport_state & CMD_T_BUSY) { |
| 1600 | cmd->transport_state |= CMD_T_REQUEST_STOP; |
| 1601 | spin_unlock_irqrestore(&cmd->t_state_lock, *flags); |
| 1602 | |
| 1603 | pr_debug("cmd %p waiting to complete\n", cmd); |
| 1604 | wait_for_completion(&cmd->task_stop_comp); |
| 1605 | pr_debug("cmd %p stopped successfully\n", cmd); |
| 1606 | |
| 1607 | spin_lock_irqsave(&cmd->t_state_lock, *flags); |
| 1608 | cmd->transport_state &= ~CMD_T_REQUEST_STOP; |
| 1609 | cmd->transport_state &= ~CMD_T_BUSY; |
| 1610 | was_active = true; |
| 1611 | } |
| 1612 | |
| 1613 | return was_active; |
| 1614 | } |
| 1615 | |
| 1616 | /* |
| 1617 | * Handle SAM-esque emulation for generic transport request failures. |
| 1618 | */ |
| 1619 | void transport_generic_request_failure(struct se_cmd *cmd) |
| 1620 | { |
| 1621 | int ret = 0; |
| 1622 | |
| 1623 | pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x" |
| 1624 | " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd), |
| 1625 | cmd->t_task_cdb[0]); |
| 1626 | pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n", |
| 1627 | cmd->se_tfo->get_cmd_state(cmd), |
| 1628 | cmd->t_state, cmd->scsi_sense_reason); |
| 1629 | pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n", |
| 1630 | (cmd->transport_state & CMD_T_ACTIVE) != 0, |
| 1631 | (cmd->transport_state & CMD_T_STOP) != 0, |
| 1632 | (cmd->transport_state & CMD_T_SENT) != 0); |
| 1633 | |
| 1634 | /* |
| 1635 | * For SAM Task Attribute emulation for failed struct se_cmd |
| 1636 | */ |
| 1637 | if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) |
| 1638 | transport_complete_task_attr(cmd); |
| 1639 | |
| 1640 | switch (cmd->scsi_sense_reason) { |
| 1641 | case TCM_NON_EXISTENT_LUN: |
| 1642 | case TCM_UNSUPPORTED_SCSI_OPCODE: |
| 1643 | case TCM_INVALID_CDB_FIELD: |
| 1644 | case TCM_INVALID_PARAMETER_LIST: |
| 1645 | case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE: |
| 1646 | case TCM_UNKNOWN_MODE_PAGE: |
| 1647 | case TCM_WRITE_PROTECTED: |
| 1648 | case TCM_ADDRESS_OUT_OF_RANGE: |
| 1649 | case TCM_CHECK_CONDITION_ABORT_CMD: |
| 1650 | case TCM_CHECK_CONDITION_UNIT_ATTENTION: |
| 1651 | case TCM_CHECK_CONDITION_NOT_READY: |
| 1652 | break; |
| 1653 | case TCM_RESERVATION_CONFLICT: |
| 1654 | /* |
| 1655 | * No SENSE Data payload for this case, set SCSI Status |
| 1656 | * and queue the response to $FABRIC_MOD. |
| 1657 | * |
| 1658 | * Uses linux/include/scsi/scsi.h SAM status codes defs |
| 1659 | */ |
| 1660 | cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT; |
| 1661 | /* |
| 1662 | * For UA Interlock Code 11b, a RESERVATION CONFLICT will |
| 1663 | * establish a UNIT ATTENTION with PREVIOUS RESERVATION |
| 1664 | * CONFLICT STATUS. |
| 1665 | * |
| 1666 | * See spc4r17, section 7.4.6 Control Mode Page, Table 349 |
| 1667 | */ |
| 1668 | if (cmd->se_sess && |
| 1669 | cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2) |
| 1670 | core_scsi3_ua_allocate(cmd->se_sess->se_node_acl, |
| 1671 | cmd->orig_fe_lun, 0x2C, |
| 1672 | ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS); |
| 1673 | |
| 1674 | ret = cmd->se_tfo->queue_status(cmd); |
| 1675 | if (ret == -EAGAIN || ret == -ENOMEM) |
| 1676 | goto queue_full; |
| 1677 | goto check_stop; |
| 1678 | default: |
| 1679 | pr_err("Unknown transport error for CDB 0x%02x: %d\n", |
| 1680 | cmd->t_task_cdb[0], cmd->scsi_sense_reason); |
| 1681 | cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; |
| 1682 | break; |
| 1683 | } |
| 1684 | |
| 1685 | ret = transport_send_check_condition_and_sense(cmd, |
| 1686 | cmd->scsi_sense_reason, 0); |
| 1687 | if (ret == -EAGAIN || ret == -ENOMEM) |
| 1688 | goto queue_full; |
| 1689 | |
| 1690 | check_stop: |
| 1691 | transport_lun_remove_cmd(cmd); |
| 1692 | if (!transport_cmd_check_stop_to_fabric(cmd)) |
| 1693 | ; |
| 1694 | return; |
| 1695 | |
| 1696 | queue_full: |
| 1697 | cmd->t_state = TRANSPORT_COMPLETE_QF_OK; |
| 1698 | transport_handle_queue_full(cmd, cmd->se_dev); |
| 1699 | } |
| 1700 | EXPORT_SYMBOL(transport_generic_request_failure); |
| 1701 | |
| 1702 | static void __target_execute_cmd(struct se_cmd *cmd) |
| 1703 | { |
| 1704 | int error = 0; |
| 1705 | |
| 1706 | spin_lock_irq(&cmd->t_state_lock); |
| 1707 | cmd->transport_state |= (CMD_T_BUSY|CMD_T_SENT); |
| 1708 | spin_unlock_irq(&cmd->t_state_lock); |
| 1709 | |
| 1710 | if (cmd->execute_cmd) |
| 1711 | error = cmd->execute_cmd(cmd); |
| 1712 | |
| 1713 | if (error) { |
| 1714 | spin_lock_irq(&cmd->t_state_lock); |
| 1715 | cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT); |
| 1716 | spin_unlock_irq(&cmd->t_state_lock); |
| 1717 | |
| 1718 | transport_generic_request_failure(cmd); |
| 1719 | } |
| 1720 | } |
| 1721 | |
| 1722 | void target_execute_cmd(struct se_cmd *cmd) |
| 1723 | { |
| 1724 | struct se_device *dev = cmd->se_dev; |
| 1725 | |
| 1726 | /* |
| 1727 | * If the received CDB has aleady been aborted stop processing it here. |
| 1728 | */ |
| 1729 | if (transport_check_aborted_status(cmd, 1)) |
| 1730 | return; |
| 1731 | |
| 1732 | /* |
| 1733 | * Determine if IOCTL context caller in requesting the stopping of this |
| 1734 | * command for LUN shutdown purposes. |
| 1735 | */ |
| 1736 | spin_lock_irq(&cmd->t_state_lock); |
| 1737 | if (cmd->transport_state & CMD_T_LUN_STOP) { |
| 1738 | pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n", |
| 1739 | __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd)); |
| 1740 | |
| 1741 | cmd->transport_state &= ~CMD_T_ACTIVE; |
| 1742 | spin_unlock_irq(&cmd->t_state_lock); |
| 1743 | complete(&cmd->transport_lun_stop_comp); |
| 1744 | return; |
| 1745 | } |
| 1746 | /* |
| 1747 | * Determine if frontend context caller is requesting the stopping of |
| 1748 | * this command for frontend exceptions. |
| 1749 | */ |
| 1750 | if (cmd->transport_state & CMD_T_STOP) { |
| 1751 | pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n", |
| 1752 | __func__, __LINE__, |
| 1753 | cmd->se_tfo->get_task_tag(cmd)); |
| 1754 | |
| 1755 | spin_unlock_irq(&cmd->t_state_lock); |
| 1756 | complete(&cmd->t_transport_stop_comp); |
| 1757 | return; |
| 1758 | } |
| 1759 | |
| 1760 | cmd->t_state = TRANSPORT_PROCESSING; |
| 1761 | spin_unlock_irq(&cmd->t_state_lock); |
| 1762 | |
| 1763 | if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) |
| 1764 | goto execute; |
| 1765 | |
| 1766 | /* |
| 1767 | * Check for the existence of HEAD_OF_QUEUE, and if true return 1 |
| 1768 | * to allow the passed struct se_cmd list of tasks to the front of the list. |
| 1769 | */ |
| 1770 | switch (cmd->sam_task_attr) { |
| 1771 | case MSG_HEAD_TAG: |
| 1772 | pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, " |
| 1773 | "se_ordered_id: %u\n", |
| 1774 | cmd->t_task_cdb[0], cmd->se_ordered_id); |
| 1775 | goto execute; |
| 1776 | case MSG_ORDERED_TAG: |
| 1777 | atomic_inc(&dev->dev_ordered_sync); |
| 1778 | smp_mb__after_atomic_inc(); |
| 1779 | |
| 1780 | pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, " |
| 1781 | " se_ordered_id: %u\n", |
| 1782 | cmd->t_task_cdb[0], cmd->se_ordered_id); |
| 1783 | |
| 1784 | /* |
| 1785 | * Execute an ORDERED command if no other older commands |
| 1786 | * exist that need to be completed first. |
| 1787 | */ |
| 1788 | if (!atomic_read(&dev->simple_cmds)) |
| 1789 | goto execute; |
| 1790 | break; |
| 1791 | default: |
| 1792 | /* |
| 1793 | * For SIMPLE and UNTAGGED Task Attribute commands |
| 1794 | */ |
| 1795 | atomic_inc(&dev->simple_cmds); |
| 1796 | smp_mb__after_atomic_inc(); |
| 1797 | break; |
| 1798 | } |
| 1799 | |
| 1800 | if (atomic_read(&dev->dev_ordered_sync) != 0) { |
| 1801 | spin_lock(&dev->delayed_cmd_lock); |
| 1802 | list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list); |
| 1803 | spin_unlock(&dev->delayed_cmd_lock); |
| 1804 | |
| 1805 | pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to" |
| 1806 | " delayed CMD list, se_ordered_id: %u\n", |
| 1807 | cmd->t_task_cdb[0], cmd->sam_task_attr, |
| 1808 | cmd->se_ordered_id); |
| 1809 | return; |
| 1810 | } |
| 1811 | |
| 1812 | execute: |
| 1813 | /* |
| 1814 | * Otherwise, no ORDERED task attributes exist.. |
| 1815 | */ |
| 1816 | __target_execute_cmd(cmd); |
| 1817 | } |
| 1818 | EXPORT_SYMBOL(target_execute_cmd); |
| 1819 | |
| 1820 | /* |
| 1821 | * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd |
| 1822 | */ |
| 1823 | static int transport_get_sense_data(struct se_cmd *cmd) |
| 1824 | { |
| 1825 | unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL; |
| 1826 | struct se_device *dev = cmd->se_dev; |
| 1827 | unsigned long flags; |
| 1828 | u32 offset = 0; |
| 1829 | |
| 1830 | WARN_ON(!cmd->se_lun); |
| 1831 | |
| 1832 | if (!dev) |
| 1833 | return 0; |
| 1834 | |
| 1835 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
| 1836 | if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) { |
| 1837 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
| 1838 | return 0; |
| 1839 | } |
| 1840 | |
| 1841 | if (!(cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)) |
| 1842 | goto out; |
| 1843 | |
| 1844 | if (!dev->transport->get_sense_buffer) { |
| 1845 | pr_err("dev->transport->get_sense_buffer is NULL\n"); |
| 1846 | goto out; |
| 1847 | } |
| 1848 | |
| 1849 | sense_buffer = dev->transport->get_sense_buffer(cmd); |
| 1850 | if (!sense_buffer) { |
| 1851 | pr_err("ITT 0x%08x cmd %p: Unable to locate" |
| 1852 | " sense buffer for task with sense\n", |
| 1853 | cmd->se_tfo->get_task_tag(cmd), cmd); |
| 1854 | goto out; |
| 1855 | } |
| 1856 | |
| 1857 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
| 1858 | |
| 1859 | offset = cmd->se_tfo->set_fabric_sense_len(cmd, TRANSPORT_SENSE_BUFFER); |
| 1860 | |
| 1861 | memcpy(&buffer[offset], sense_buffer, TRANSPORT_SENSE_BUFFER); |
| 1862 | |
| 1863 | /* Automatically padded */ |
| 1864 | cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset; |
| 1865 | |
| 1866 | pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x and sense\n", |
| 1867 | dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status); |
| 1868 | return 0; |
| 1869 | |
| 1870 | out: |
| 1871 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
| 1872 | return -1; |
| 1873 | } |
| 1874 | |
| 1875 | /* |
| 1876 | * Process all commands up to the last received ORDERED task attribute which |
| 1877 | * requires another blocking boundary |
| 1878 | */ |
| 1879 | static void target_restart_delayed_cmds(struct se_device *dev) |
| 1880 | { |
| 1881 | for (;;) { |
| 1882 | struct se_cmd *cmd; |
| 1883 | |
| 1884 | spin_lock(&dev->delayed_cmd_lock); |
| 1885 | if (list_empty(&dev->delayed_cmd_list)) { |
| 1886 | spin_unlock(&dev->delayed_cmd_lock); |
| 1887 | break; |
| 1888 | } |
| 1889 | |
| 1890 | cmd = list_entry(dev->delayed_cmd_list.next, |
| 1891 | struct se_cmd, se_delayed_node); |
| 1892 | list_del(&cmd->se_delayed_node); |
| 1893 | spin_unlock(&dev->delayed_cmd_lock); |
| 1894 | |
| 1895 | __target_execute_cmd(cmd); |
| 1896 | |
| 1897 | if (cmd->sam_task_attr == MSG_ORDERED_TAG) |
| 1898 | break; |
| 1899 | } |
| 1900 | } |
| 1901 | |
| 1902 | /* |
| 1903 | * Called from I/O completion to determine which dormant/delayed |
| 1904 | * and ordered cmds need to have their tasks added to the execution queue. |
| 1905 | */ |
| 1906 | static void transport_complete_task_attr(struct se_cmd *cmd) |
| 1907 | { |
| 1908 | struct se_device *dev = cmd->se_dev; |
| 1909 | |
| 1910 | if (cmd->sam_task_attr == MSG_SIMPLE_TAG) { |
| 1911 | atomic_dec(&dev->simple_cmds); |
| 1912 | smp_mb__after_atomic_dec(); |
| 1913 | dev->dev_cur_ordered_id++; |
| 1914 | pr_debug("Incremented dev->dev_cur_ordered_id: %u for" |
| 1915 | " SIMPLE: %u\n", dev->dev_cur_ordered_id, |
| 1916 | cmd->se_ordered_id); |
| 1917 | } else if (cmd->sam_task_attr == MSG_HEAD_TAG) { |
| 1918 | dev->dev_cur_ordered_id++; |
| 1919 | pr_debug("Incremented dev_cur_ordered_id: %u for" |
| 1920 | " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id, |
| 1921 | cmd->se_ordered_id); |
| 1922 | } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) { |
| 1923 | atomic_dec(&dev->dev_ordered_sync); |
| 1924 | smp_mb__after_atomic_dec(); |
| 1925 | |
| 1926 | dev->dev_cur_ordered_id++; |
| 1927 | pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:" |
| 1928 | " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id); |
| 1929 | } |
| 1930 | |
| 1931 | target_restart_delayed_cmds(dev); |
| 1932 | } |
| 1933 | |
| 1934 | static void transport_complete_qf(struct se_cmd *cmd) |
| 1935 | { |
| 1936 | int ret = 0; |
| 1937 | |
| 1938 | if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) |
| 1939 | transport_complete_task_attr(cmd); |
| 1940 | |
| 1941 | if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) { |
| 1942 | ret = cmd->se_tfo->queue_status(cmd); |
| 1943 | if (ret) |
| 1944 | goto out; |
| 1945 | } |
| 1946 | |
| 1947 | switch (cmd->data_direction) { |
| 1948 | case DMA_FROM_DEVICE: |
| 1949 | ret = cmd->se_tfo->queue_data_in(cmd); |
| 1950 | break; |
| 1951 | case DMA_TO_DEVICE: |
| 1952 | if (cmd->t_bidi_data_sg) { |
| 1953 | ret = cmd->se_tfo->queue_data_in(cmd); |
| 1954 | if (ret < 0) |
| 1955 | break; |
| 1956 | } |
| 1957 | /* Fall through for DMA_TO_DEVICE */ |
| 1958 | case DMA_NONE: |
| 1959 | ret = cmd->se_tfo->queue_status(cmd); |
| 1960 | break; |
| 1961 | default: |
| 1962 | break; |
| 1963 | } |
| 1964 | |
| 1965 | out: |
| 1966 | if (ret < 0) { |
| 1967 | transport_handle_queue_full(cmd, cmd->se_dev); |
| 1968 | return; |
| 1969 | } |
| 1970 | transport_lun_remove_cmd(cmd); |
| 1971 | transport_cmd_check_stop_to_fabric(cmd); |
| 1972 | } |
| 1973 | |
| 1974 | static void transport_handle_queue_full( |
| 1975 | struct se_cmd *cmd, |
| 1976 | struct se_device *dev) |
| 1977 | { |
| 1978 | spin_lock_irq(&dev->qf_cmd_lock); |
| 1979 | list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list); |
| 1980 | atomic_inc(&dev->dev_qf_count); |
| 1981 | smp_mb__after_atomic_inc(); |
| 1982 | spin_unlock_irq(&cmd->se_dev->qf_cmd_lock); |
| 1983 | |
| 1984 | schedule_work(&cmd->se_dev->qf_work_queue); |
| 1985 | } |
| 1986 | |
| 1987 | static void target_complete_ok_work(struct work_struct *work) |
| 1988 | { |
| 1989 | struct se_cmd *cmd = container_of(work, struct se_cmd, work); |
| 1990 | int reason = 0, ret; |
| 1991 | |
| 1992 | /* |
| 1993 | * Check if we need to move delayed/dormant tasks from cmds on the |
| 1994 | * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task |
| 1995 | * Attribute. |
| 1996 | */ |
| 1997 | if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) |
| 1998 | transport_complete_task_attr(cmd); |
| 1999 | /* |
| 2000 | * Check to schedule QUEUE_FULL work, or execute an existing |
| 2001 | * cmd->transport_qf_callback() |
| 2002 | */ |
| 2003 | if (atomic_read(&cmd->se_dev->dev_qf_count) != 0) |
| 2004 | schedule_work(&cmd->se_dev->qf_work_queue); |
| 2005 | |
| 2006 | /* |
| 2007 | * Check if we need to retrieve a sense buffer from |
| 2008 | * the struct se_cmd in question. |
| 2009 | */ |
| 2010 | if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) { |
| 2011 | if (transport_get_sense_data(cmd) < 0) |
| 2012 | reason = TCM_NON_EXISTENT_LUN; |
| 2013 | |
| 2014 | if (cmd->scsi_status) { |
| 2015 | ret = transport_send_check_condition_and_sense( |
| 2016 | cmd, reason, 1); |
| 2017 | if (ret == -EAGAIN || ret == -ENOMEM) |
| 2018 | goto queue_full; |
| 2019 | |
| 2020 | transport_lun_remove_cmd(cmd); |
| 2021 | transport_cmd_check_stop_to_fabric(cmd); |
| 2022 | return; |
| 2023 | } |
| 2024 | } |
| 2025 | /* |
| 2026 | * Check for a callback, used by amongst other things |
| 2027 | * XDWRITE_READ_10 emulation. |
| 2028 | */ |
| 2029 | if (cmd->transport_complete_callback) |
| 2030 | cmd->transport_complete_callback(cmd); |
| 2031 | |
| 2032 | switch (cmd->data_direction) { |
| 2033 | case DMA_FROM_DEVICE: |
| 2034 | spin_lock(&cmd->se_lun->lun_sep_lock); |
| 2035 | if (cmd->se_lun->lun_sep) { |
| 2036 | cmd->se_lun->lun_sep->sep_stats.tx_data_octets += |
| 2037 | cmd->data_length; |
| 2038 | } |
| 2039 | spin_unlock(&cmd->se_lun->lun_sep_lock); |
| 2040 | |
| 2041 | ret = cmd->se_tfo->queue_data_in(cmd); |
| 2042 | if (ret == -EAGAIN || ret == -ENOMEM) |
| 2043 | goto queue_full; |
| 2044 | break; |
| 2045 | case DMA_TO_DEVICE: |
| 2046 | spin_lock(&cmd->se_lun->lun_sep_lock); |
| 2047 | if (cmd->se_lun->lun_sep) { |
| 2048 | cmd->se_lun->lun_sep->sep_stats.rx_data_octets += |
| 2049 | cmd->data_length; |
| 2050 | } |
| 2051 | spin_unlock(&cmd->se_lun->lun_sep_lock); |
| 2052 | /* |
| 2053 | * Check if we need to send READ payload for BIDI-COMMAND |
| 2054 | */ |
| 2055 | if (cmd->t_bidi_data_sg) { |
| 2056 | spin_lock(&cmd->se_lun->lun_sep_lock); |
| 2057 | if (cmd->se_lun->lun_sep) { |
| 2058 | cmd->se_lun->lun_sep->sep_stats.tx_data_octets += |
| 2059 | cmd->data_length; |
| 2060 | } |
| 2061 | spin_unlock(&cmd->se_lun->lun_sep_lock); |
| 2062 | ret = cmd->se_tfo->queue_data_in(cmd); |
| 2063 | if (ret == -EAGAIN || ret == -ENOMEM) |
| 2064 | goto queue_full; |
| 2065 | break; |
| 2066 | } |
| 2067 | /* Fall through for DMA_TO_DEVICE */ |
| 2068 | case DMA_NONE: |
| 2069 | ret = cmd->se_tfo->queue_status(cmd); |
| 2070 | if (ret == -EAGAIN || ret == -ENOMEM) |
| 2071 | goto queue_full; |
| 2072 | break; |
| 2073 | default: |
| 2074 | break; |
| 2075 | } |
| 2076 | |
| 2077 | transport_lun_remove_cmd(cmd); |
| 2078 | transport_cmd_check_stop_to_fabric(cmd); |
| 2079 | return; |
| 2080 | |
| 2081 | queue_full: |
| 2082 | pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p," |
| 2083 | " data_direction: %d\n", cmd, cmd->data_direction); |
| 2084 | cmd->t_state = TRANSPORT_COMPLETE_QF_OK; |
| 2085 | transport_handle_queue_full(cmd, cmd->se_dev); |
| 2086 | } |
| 2087 | |
| 2088 | static inline void transport_free_sgl(struct scatterlist *sgl, int nents) |
| 2089 | { |
| 2090 | struct scatterlist *sg; |
| 2091 | int count; |
| 2092 | |
| 2093 | for_each_sg(sgl, sg, nents, count) |
| 2094 | __free_page(sg_page(sg)); |
| 2095 | |
| 2096 | kfree(sgl); |
| 2097 | } |
| 2098 | |
| 2099 | static inline void transport_free_pages(struct se_cmd *cmd) |
| 2100 | { |
| 2101 | if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) |
| 2102 | return; |
| 2103 | |
| 2104 | transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents); |
| 2105 | cmd->t_data_sg = NULL; |
| 2106 | cmd->t_data_nents = 0; |
| 2107 | |
| 2108 | transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents); |
| 2109 | cmd->t_bidi_data_sg = NULL; |
| 2110 | cmd->t_bidi_data_nents = 0; |
| 2111 | } |
| 2112 | |
| 2113 | /** |
| 2114 | * transport_release_cmd - free a command |
| 2115 | * @cmd: command to free |
| 2116 | * |
| 2117 | * This routine unconditionally frees a command, and reference counting |
| 2118 | * or list removal must be done in the caller. |
| 2119 | */ |
| 2120 | static void transport_release_cmd(struct se_cmd *cmd) |
| 2121 | { |
| 2122 | BUG_ON(!cmd->se_tfo); |
| 2123 | |
| 2124 | if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB) |
| 2125 | core_tmr_release_req(cmd->se_tmr_req); |
| 2126 | if (cmd->t_task_cdb != cmd->__t_task_cdb) |
| 2127 | kfree(cmd->t_task_cdb); |
| 2128 | /* |
| 2129 | * If this cmd has been setup with target_get_sess_cmd(), drop |
| 2130 | * the kref and call ->release_cmd() in kref callback. |
| 2131 | */ |
| 2132 | if (cmd->check_release != 0) { |
| 2133 | target_put_sess_cmd(cmd->se_sess, cmd); |
| 2134 | return; |
| 2135 | } |
| 2136 | cmd->se_tfo->release_cmd(cmd); |
| 2137 | } |
| 2138 | |
| 2139 | /** |
| 2140 | * transport_put_cmd - release a reference to a command |
| 2141 | * @cmd: command to release |
| 2142 | * |
| 2143 | * This routine releases our reference to the command and frees it if possible. |
| 2144 | */ |
| 2145 | static void transport_put_cmd(struct se_cmd *cmd) |
| 2146 | { |
| 2147 | unsigned long flags; |
| 2148 | |
| 2149 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
| 2150 | if (atomic_read(&cmd->t_fe_count)) { |
| 2151 | if (!atomic_dec_and_test(&cmd->t_fe_count)) |
| 2152 | goto out_busy; |
| 2153 | } |
| 2154 | |
| 2155 | if (cmd->transport_state & CMD_T_DEV_ACTIVE) { |
| 2156 | cmd->transport_state &= ~CMD_T_DEV_ACTIVE; |
| 2157 | target_remove_from_state_list(cmd); |
| 2158 | } |
| 2159 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
| 2160 | |
| 2161 | transport_free_pages(cmd); |
| 2162 | transport_release_cmd(cmd); |
| 2163 | return; |
| 2164 | out_busy: |
| 2165 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
| 2166 | } |
| 2167 | |
| 2168 | /* |
| 2169 | * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of |
| 2170 | * allocating in the core. |
| 2171 | * @cmd: Associated se_cmd descriptor |
| 2172 | * @mem: SGL style memory for TCM WRITE / READ |
| 2173 | * @sg_mem_num: Number of SGL elements |
| 2174 | * @mem_bidi_in: SGL style memory for TCM BIDI READ |
| 2175 | * @sg_mem_bidi_num: Number of BIDI READ SGL elements |
| 2176 | * |
| 2177 | * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage |
| 2178 | * of parameters. |
| 2179 | */ |
| 2180 | int transport_generic_map_mem_to_cmd( |
| 2181 | struct se_cmd *cmd, |
| 2182 | struct scatterlist *sgl, |
| 2183 | u32 sgl_count, |
| 2184 | struct scatterlist *sgl_bidi, |
| 2185 | u32 sgl_bidi_count) |
| 2186 | { |
| 2187 | if (!sgl || !sgl_count) |
| 2188 | return 0; |
| 2189 | |
| 2190 | /* |
| 2191 | * Reject SCSI data overflow with map_mem_to_cmd() as incoming |
| 2192 | * scatterlists already have been set to follow what the fabric |
| 2193 | * passes for the original expected data transfer length. |
| 2194 | */ |
| 2195 | if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) { |
| 2196 | pr_warn("Rejecting SCSI DATA overflow for fabric using" |
| 2197 | " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n"); |
| 2198 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; |
| 2199 | cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; |
| 2200 | return -EINVAL; |
| 2201 | } |
| 2202 | |
| 2203 | cmd->t_data_sg = sgl; |
| 2204 | cmd->t_data_nents = sgl_count; |
| 2205 | |
| 2206 | if (sgl_bidi && sgl_bidi_count) { |
| 2207 | cmd->t_bidi_data_sg = sgl_bidi; |
| 2208 | cmd->t_bidi_data_nents = sgl_bidi_count; |
| 2209 | } |
| 2210 | cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC; |
| 2211 | return 0; |
| 2212 | } |
| 2213 | EXPORT_SYMBOL(transport_generic_map_mem_to_cmd); |
| 2214 | |
| 2215 | void *transport_kmap_data_sg(struct se_cmd *cmd) |
| 2216 | { |
| 2217 | struct scatterlist *sg = cmd->t_data_sg; |
| 2218 | struct page **pages; |
| 2219 | int i; |
| 2220 | |
| 2221 | BUG_ON(!sg); |
| 2222 | /* |
| 2223 | * We need to take into account a possible offset here for fabrics like |
| 2224 | * tcm_loop who may be using a contig buffer from the SCSI midlayer for |
| 2225 | * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd() |
| 2226 | */ |
| 2227 | if (!cmd->t_data_nents) |
| 2228 | return NULL; |
| 2229 | else if (cmd->t_data_nents == 1) |
| 2230 | return kmap(sg_page(sg)) + sg->offset; |
| 2231 | |
| 2232 | /* >1 page. use vmap */ |
| 2233 | pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL); |
| 2234 | if (!pages) |
| 2235 | return NULL; |
| 2236 | |
| 2237 | /* convert sg[] to pages[] */ |
| 2238 | for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) { |
| 2239 | pages[i] = sg_page(sg); |
| 2240 | } |
| 2241 | |
| 2242 | cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL); |
| 2243 | kfree(pages); |
| 2244 | if (!cmd->t_data_vmap) |
| 2245 | return NULL; |
| 2246 | |
| 2247 | return cmd->t_data_vmap + cmd->t_data_sg[0].offset; |
| 2248 | } |
| 2249 | EXPORT_SYMBOL(transport_kmap_data_sg); |
| 2250 | |
| 2251 | void transport_kunmap_data_sg(struct se_cmd *cmd) |
| 2252 | { |
| 2253 | if (!cmd->t_data_nents) { |
| 2254 | return; |
| 2255 | } else if (cmd->t_data_nents == 1) { |
| 2256 | kunmap(sg_page(cmd->t_data_sg)); |
| 2257 | return; |
| 2258 | } |
| 2259 | |
| 2260 | vunmap(cmd->t_data_vmap); |
| 2261 | cmd->t_data_vmap = NULL; |
| 2262 | } |
| 2263 | EXPORT_SYMBOL(transport_kunmap_data_sg); |
| 2264 | |
| 2265 | static int |
| 2266 | transport_generic_get_mem(struct se_cmd *cmd) |
| 2267 | { |
| 2268 | u32 length = cmd->data_length; |
| 2269 | unsigned int nents; |
| 2270 | struct page *page; |
| 2271 | gfp_t zero_flag; |
| 2272 | int i = 0; |
| 2273 | |
| 2274 | nents = DIV_ROUND_UP(length, PAGE_SIZE); |
| 2275 | cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL); |
| 2276 | if (!cmd->t_data_sg) |
| 2277 | return -ENOMEM; |
| 2278 | |
| 2279 | cmd->t_data_nents = nents; |
| 2280 | sg_init_table(cmd->t_data_sg, nents); |
| 2281 | |
| 2282 | zero_flag = cmd->se_cmd_flags & SCF_SCSI_DATA_CDB ? 0 : __GFP_ZERO; |
| 2283 | |
| 2284 | while (length) { |
| 2285 | u32 page_len = min_t(u32, length, PAGE_SIZE); |
| 2286 | page = alloc_page(GFP_KERNEL | zero_flag); |
| 2287 | if (!page) |
| 2288 | goto out; |
| 2289 | |
| 2290 | sg_set_page(&cmd->t_data_sg[i], page, page_len, 0); |
| 2291 | length -= page_len; |
| 2292 | i++; |
| 2293 | } |
| 2294 | return 0; |
| 2295 | |
| 2296 | out: |
| 2297 | while (i >= 0) { |
| 2298 | __free_page(sg_page(&cmd->t_data_sg[i])); |
| 2299 | i--; |
| 2300 | } |
| 2301 | kfree(cmd->t_data_sg); |
| 2302 | cmd->t_data_sg = NULL; |
| 2303 | return -ENOMEM; |
| 2304 | } |
| 2305 | |
| 2306 | /* |
| 2307 | * Allocate any required resources to execute the command. For writes we |
| 2308 | * might not have the payload yet, so notify the fabric via a call to |
| 2309 | * ->write_pending instead. Otherwise place it on the execution queue. |
| 2310 | */ |
| 2311 | int transport_generic_new_cmd(struct se_cmd *cmd) |
| 2312 | { |
| 2313 | int ret = 0; |
| 2314 | |
| 2315 | /* |
| 2316 | * Determine is the TCM fabric module has already allocated physical |
| 2317 | * memory, and is directly calling transport_generic_map_mem_to_cmd() |
| 2318 | * beforehand. |
| 2319 | */ |
| 2320 | if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) && |
| 2321 | cmd->data_length) { |
| 2322 | ret = transport_generic_get_mem(cmd); |
| 2323 | if (ret < 0) |
| 2324 | goto out_fail; |
| 2325 | } |
| 2326 | |
| 2327 | /* Workaround for handling zero-length control CDBs */ |
| 2328 | if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) && !cmd->data_length) { |
| 2329 | spin_lock_irq(&cmd->t_state_lock); |
| 2330 | cmd->t_state = TRANSPORT_COMPLETE; |
| 2331 | cmd->transport_state |= CMD_T_ACTIVE; |
| 2332 | spin_unlock_irq(&cmd->t_state_lock); |
| 2333 | |
| 2334 | if (cmd->t_task_cdb[0] == REQUEST_SENSE) { |
| 2335 | u8 ua_asc = 0, ua_ascq = 0; |
| 2336 | |
| 2337 | core_scsi3_ua_clear_for_request_sense(cmd, |
| 2338 | &ua_asc, &ua_ascq); |
| 2339 | } |
| 2340 | |
| 2341 | INIT_WORK(&cmd->work, target_complete_ok_work); |
| 2342 | queue_work(target_completion_wq, &cmd->work); |
| 2343 | return 0; |
| 2344 | } |
| 2345 | |
| 2346 | atomic_inc(&cmd->t_fe_count); |
| 2347 | |
| 2348 | /* |
| 2349 | * If this command is not a write we can execute it right here, |
| 2350 | * for write buffers we need to notify the fabric driver first |
| 2351 | * and let it call back once the write buffers are ready. |
| 2352 | */ |
| 2353 | target_add_to_state_list(cmd); |
| 2354 | if (cmd->data_direction != DMA_TO_DEVICE) { |
| 2355 | target_execute_cmd(cmd); |
| 2356 | return 0; |
| 2357 | } |
| 2358 | |
| 2359 | spin_lock_irq(&cmd->t_state_lock); |
| 2360 | cmd->t_state = TRANSPORT_WRITE_PENDING; |
| 2361 | spin_unlock_irq(&cmd->t_state_lock); |
| 2362 | |
| 2363 | transport_cmd_check_stop(cmd, false); |
| 2364 | |
| 2365 | ret = cmd->se_tfo->write_pending(cmd); |
| 2366 | if (ret == -EAGAIN || ret == -ENOMEM) |
| 2367 | goto queue_full; |
| 2368 | |
| 2369 | if (ret < 0) |
| 2370 | return ret; |
| 2371 | return 1; |
| 2372 | |
| 2373 | out_fail: |
| 2374 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; |
| 2375 | cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
| 2376 | return -EINVAL; |
| 2377 | queue_full: |
| 2378 | pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd); |
| 2379 | cmd->t_state = TRANSPORT_COMPLETE_QF_WP; |
| 2380 | transport_handle_queue_full(cmd, cmd->se_dev); |
| 2381 | return 0; |
| 2382 | } |
| 2383 | EXPORT_SYMBOL(transport_generic_new_cmd); |
| 2384 | |
| 2385 | static void transport_write_pending_qf(struct se_cmd *cmd) |
| 2386 | { |
| 2387 | int ret; |
| 2388 | |
| 2389 | ret = cmd->se_tfo->write_pending(cmd); |
| 2390 | if (ret == -EAGAIN || ret == -ENOMEM) { |
| 2391 | pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", |
| 2392 | cmd); |
| 2393 | transport_handle_queue_full(cmd, cmd->se_dev); |
| 2394 | } |
| 2395 | } |
| 2396 | |
| 2397 | void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks) |
| 2398 | { |
| 2399 | if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) { |
| 2400 | if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) |
| 2401 | transport_wait_for_tasks(cmd); |
| 2402 | |
| 2403 | transport_release_cmd(cmd); |
| 2404 | } else { |
| 2405 | if (wait_for_tasks) |
| 2406 | transport_wait_for_tasks(cmd); |
| 2407 | |
| 2408 | core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd); |
| 2409 | |
| 2410 | if (cmd->se_lun) |
| 2411 | transport_lun_remove_cmd(cmd); |
| 2412 | |
| 2413 | transport_put_cmd(cmd); |
| 2414 | } |
| 2415 | } |
| 2416 | EXPORT_SYMBOL(transport_generic_free_cmd); |
| 2417 | |
| 2418 | /* target_get_sess_cmd - Add command to active ->sess_cmd_list |
| 2419 | * @se_sess: session to reference |
| 2420 | * @se_cmd: command descriptor to add |
| 2421 | * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd() |
| 2422 | */ |
| 2423 | static int target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd, |
| 2424 | bool ack_kref) |
| 2425 | { |
| 2426 | unsigned long flags; |
| 2427 | int ret = 0; |
| 2428 | |
| 2429 | kref_init(&se_cmd->cmd_kref); |
| 2430 | /* |
| 2431 | * Add a second kref if the fabric caller is expecting to handle |
| 2432 | * fabric acknowledgement that requires two target_put_sess_cmd() |
| 2433 | * invocations before se_cmd descriptor release. |
| 2434 | */ |
| 2435 | if (ack_kref == true) { |
| 2436 | kref_get(&se_cmd->cmd_kref); |
| 2437 | se_cmd->se_cmd_flags |= SCF_ACK_KREF; |
| 2438 | } |
| 2439 | |
| 2440 | spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); |
| 2441 | if (se_sess->sess_tearing_down) { |
| 2442 | ret = -ESHUTDOWN; |
| 2443 | goto out; |
| 2444 | } |
| 2445 | list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list); |
| 2446 | se_cmd->check_release = 1; |
| 2447 | |
| 2448 | out: |
| 2449 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); |
| 2450 | return ret; |
| 2451 | } |
| 2452 | |
| 2453 | static void target_release_cmd_kref(struct kref *kref) |
| 2454 | { |
| 2455 | struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref); |
| 2456 | struct se_session *se_sess = se_cmd->se_sess; |
| 2457 | unsigned long flags; |
| 2458 | |
| 2459 | spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); |
| 2460 | if (list_empty(&se_cmd->se_cmd_list)) { |
| 2461 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); |
| 2462 | se_cmd->se_tfo->release_cmd(se_cmd); |
| 2463 | return; |
| 2464 | } |
| 2465 | if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) { |
| 2466 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); |
| 2467 | complete(&se_cmd->cmd_wait_comp); |
| 2468 | return; |
| 2469 | } |
| 2470 | list_del(&se_cmd->se_cmd_list); |
| 2471 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); |
| 2472 | |
| 2473 | se_cmd->se_tfo->release_cmd(se_cmd); |
| 2474 | } |
| 2475 | |
| 2476 | /* target_put_sess_cmd - Check for active I/O shutdown via kref_put |
| 2477 | * @se_sess: session to reference |
| 2478 | * @se_cmd: command descriptor to drop |
| 2479 | */ |
| 2480 | int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd) |
| 2481 | { |
| 2482 | return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref); |
| 2483 | } |
| 2484 | EXPORT_SYMBOL(target_put_sess_cmd); |
| 2485 | |
| 2486 | /* target_sess_cmd_list_set_waiting - Flag all commands in |
| 2487 | * sess_cmd_list to complete cmd_wait_comp. Set |
| 2488 | * sess_tearing_down so no more commands are queued. |
| 2489 | * @se_sess: session to flag |
| 2490 | */ |
| 2491 | void target_sess_cmd_list_set_waiting(struct se_session *se_sess) |
| 2492 | { |
| 2493 | struct se_cmd *se_cmd; |
| 2494 | unsigned long flags; |
| 2495 | |
| 2496 | spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); |
| 2497 | |
| 2498 | WARN_ON(se_sess->sess_tearing_down); |
| 2499 | se_sess->sess_tearing_down = 1; |
| 2500 | |
| 2501 | list_for_each_entry(se_cmd, &se_sess->sess_cmd_list, se_cmd_list) |
| 2502 | se_cmd->cmd_wait_set = 1; |
| 2503 | |
| 2504 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); |
| 2505 | } |
| 2506 | EXPORT_SYMBOL(target_sess_cmd_list_set_waiting); |
| 2507 | |
| 2508 | /* target_wait_for_sess_cmds - Wait for outstanding descriptors |
| 2509 | * @se_sess: session to wait for active I/O |
| 2510 | * @wait_for_tasks: Make extra transport_wait_for_tasks call |
| 2511 | */ |
| 2512 | void target_wait_for_sess_cmds( |
| 2513 | struct se_session *se_sess, |
| 2514 | int wait_for_tasks) |
| 2515 | { |
| 2516 | struct se_cmd *se_cmd, *tmp_cmd; |
| 2517 | bool rc = false; |
| 2518 | |
| 2519 | list_for_each_entry_safe(se_cmd, tmp_cmd, |
| 2520 | &se_sess->sess_cmd_list, se_cmd_list) { |
| 2521 | list_del(&se_cmd->se_cmd_list); |
| 2522 | |
| 2523 | pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:" |
| 2524 | " %d\n", se_cmd, se_cmd->t_state, |
| 2525 | se_cmd->se_tfo->get_cmd_state(se_cmd)); |
| 2526 | |
| 2527 | if (wait_for_tasks) { |
| 2528 | pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d," |
| 2529 | " fabric state: %d\n", se_cmd, se_cmd->t_state, |
| 2530 | se_cmd->se_tfo->get_cmd_state(se_cmd)); |
| 2531 | |
| 2532 | rc = transport_wait_for_tasks(se_cmd); |
| 2533 | |
| 2534 | pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d," |
| 2535 | " fabric state: %d\n", se_cmd, se_cmd->t_state, |
| 2536 | se_cmd->se_tfo->get_cmd_state(se_cmd)); |
| 2537 | } |
| 2538 | |
| 2539 | if (!rc) { |
| 2540 | wait_for_completion(&se_cmd->cmd_wait_comp); |
| 2541 | pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d" |
| 2542 | " fabric state: %d\n", se_cmd, se_cmd->t_state, |
| 2543 | se_cmd->se_tfo->get_cmd_state(se_cmd)); |
| 2544 | } |
| 2545 | |
| 2546 | se_cmd->se_tfo->release_cmd(se_cmd); |
| 2547 | } |
| 2548 | } |
| 2549 | EXPORT_SYMBOL(target_wait_for_sess_cmds); |
| 2550 | |
| 2551 | /* transport_lun_wait_for_tasks(): |
| 2552 | * |
| 2553 | * Called from ConfigFS context to stop the passed struct se_cmd to allow |
| 2554 | * an struct se_lun to be successfully shutdown. |
| 2555 | */ |
| 2556 | static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun) |
| 2557 | { |
| 2558 | unsigned long flags; |
| 2559 | int ret = 0; |
| 2560 | |
| 2561 | /* |
| 2562 | * If the frontend has already requested this struct se_cmd to |
| 2563 | * be stopped, we can safely ignore this struct se_cmd. |
| 2564 | */ |
| 2565 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
| 2566 | if (cmd->transport_state & CMD_T_STOP) { |
| 2567 | cmd->transport_state &= ~CMD_T_LUN_STOP; |
| 2568 | |
| 2569 | pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n", |
| 2570 | cmd->se_tfo->get_task_tag(cmd)); |
| 2571 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
| 2572 | transport_cmd_check_stop(cmd, false); |
| 2573 | return -EPERM; |
| 2574 | } |
| 2575 | cmd->transport_state |= CMD_T_LUN_FE_STOP; |
| 2576 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
| 2577 | |
| 2578 | // XXX: audit task_flags checks. |
| 2579 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
| 2580 | if ((cmd->transport_state & CMD_T_BUSY) && |
| 2581 | (cmd->transport_state & CMD_T_SENT)) { |
| 2582 | if (!target_stop_cmd(cmd, &flags)) |
| 2583 | ret++; |
| 2584 | } |
| 2585 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
| 2586 | |
| 2587 | pr_debug("ConfigFS: cmd: %p stop tasks ret:" |
| 2588 | " %d\n", cmd, ret); |
| 2589 | if (!ret) { |
| 2590 | pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n", |
| 2591 | cmd->se_tfo->get_task_tag(cmd)); |
| 2592 | wait_for_completion(&cmd->transport_lun_stop_comp); |
| 2593 | pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n", |
| 2594 | cmd->se_tfo->get_task_tag(cmd)); |
| 2595 | } |
| 2596 | |
| 2597 | return 0; |
| 2598 | } |
| 2599 | |
| 2600 | static void __transport_clear_lun_from_sessions(struct se_lun *lun) |
| 2601 | { |
| 2602 | struct se_cmd *cmd = NULL; |
| 2603 | unsigned long lun_flags, cmd_flags; |
| 2604 | /* |
| 2605 | * Do exception processing and return CHECK_CONDITION status to the |
| 2606 | * Initiator Port. |
| 2607 | */ |
| 2608 | spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags); |
| 2609 | while (!list_empty(&lun->lun_cmd_list)) { |
| 2610 | cmd = list_first_entry(&lun->lun_cmd_list, |
| 2611 | struct se_cmd, se_lun_node); |
| 2612 | list_del_init(&cmd->se_lun_node); |
| 2613 | |
| 2614 | spin_lock(&cmd->t_state_lock); |
| 2615 | pr_debug("SE_LUN[%d] - Setting cmd->transport" |
| 2616 | "_lun_stop for ITT: 0x%08x\n", |
| 2617 | cmd->se_lun->unpacked_lun, |
| 2618 | cmd->se_tfo->get_task_tag(cmd)); |
| 2619 | cmd->transport_state |= CMD_T_LUN_STOP; |
| 2620 | spin_unlock(&cmd->t_state_lock); |
| 2621 | |
| 2622 | spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags); |
| 2623 | |
| 2624 | if (!cmd->se_lun) { |
| 2625 | pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n", |
| 2626 | cmd->se_tfo->get_task_tag(cmd), |
| 2627 | cmd->se_tfo->get_cmd_state(cmd), cmd->t_state); |
| 2628 | BUG(); |
| 2629 | } |
| 2630 | /* |
| 2631 | * If the Storage engine still owns the iscsi_cmd_t, determine |
| 2632 | * and/or stop its context. |
| 2633 | */ |
| 2634 | pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport" |
| 2635 | "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun, |
| 2636 | cmd->se_tfo->get_task_tag(cmd)); |
| 2637 | |
| 2638 | if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) { |
| 2639 | spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags); |
| 2640 | continue; |
| 2641 | } |
| 2642 | |
| 2643 | pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun" |
| 2644 | "_wait_for_tasks(): SUCCESS\n", |
| 2645 | cmd->se_lun->unpacked_lun, |
| 2646 | cmd->se_tfo->get_task_tag(cmd)); |
| 2647 | |
| 2648 | spin_lock_irqsave(&cmd->t_state_lock, cmd_flags); |
| 2649 | if (!(cmd->transport_state & CMD_T_DEV_ACTIVE)) { |
| 2650 | spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags); |
| 2651 | goto check_cond; |
| 2652 | } |
| 2653 | cmd->transport_state &= ~CMD_T_DEV_ACTIVE; |
| 2654 | target_remove_from_state_list(cmd); |
| 2655 | spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags); |
| 2656 | |
| 2657 | /* |
| 2658 | * The Storage engine stopped this struct se_cmd before it was |
| 2659 | * send to the fabric frontend for delivery back to the |
| 2660 | * Initiator Node. Return this SCSI CDB back with an |
| 2661 | * CHECK_CONDITION status. |
| 2662 | */ |
| 2663 | check_cond: |
| 2664 | transport_send_check_condition_and_sense(cmd, |
| 2665 | TCM_NON_EXISTENT_LUN, 0); |
| 2666 | /* |
| 2667 | * If the fabric frontend is waiting for this iscsi_cmd_t to |
| 2668 | * be released, notify the waiting thread now that LU has |
| 2669 | * finished accessing it. |
| 2670 | */ |
| 2671 | spin_lock_irqsave(&cmd->t_state_lock, cmd_flags); |
| 2672 | if (cmd->transport_state & CMD_T_LUN_FE_STOP) { |
| 2673 | pr_debug("SE_LUN[%d] - Detected FE stop for" |
| 2674 | " struct se_cmd: %p ITT: 0x%08x\n", |
| 2675 | lun->unpacked_lun, |
| 2676 | cmd, cmd->se_tfo->get_task_tag(cmd)); |
| 2677 | |
| 2678 | spin_unlock_irqrestore(&cmd->t_state_lock, |
| 2679 | cmd_flags); |
| 2680 | transport_cmd_check_stop(cmd, false); |
| 2681 | complete(&cmd->transport_lun_fe_stop_comp); |
| 2682 | spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags); |
| 2683 | continue; |
| 2684 | } |
| 2685 | pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n", |
| 2686 | lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd)); |
| 2687 | |
| 2688 | spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags); |
| 2689 | spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags); |
| 2690 | } |
| 2691 | spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags); |
| 2692 | } |
| 2693 | |
| 2694 | static int transport_clear_lun_thread(void *p) |
| 2695 | { |
| 2696 | struct se_lun *lun = p; |
| 2697 | |
| 2698 | __transport_clear_lun_from_sessions(lun); |
| 2699 | complete(&lun->lun_shutdown_comp); |
| 2700 | |
| 2701 | return 0; |
| 2702 | } |
| 2703 | |
| 2704 | int transport_clear_lun_from_sessions(struct se_lun *lun) |
| 2705 | { |
| 2706 | struct task_struct *kt; |
| 2707 | |
| 2708 | kt = kthread_run(transport_clear_lun_thread, lun, |
| 2709 | "tcm_cl_%u", lun->unpacked_lun); |
| 2710 | if (IS_ERR(kt)) { |
| 2711 | pr_err("Unable to start clear_lun thread\n"); |
| 2712 | return PTR_ERR(kt); |
| 2713 | } |
| 2714 | wait_for_completion(&lun->lun_shutdown_comp); |
| 2715 | |
| 2716 | return 0; |
| 2717 | } |
| 2718 | |
| 2719 | /** |
| 2720 | * transport_wait_for_tasks - wait for completion to occur |
| 2721 | * @cmd: command to wait |
| 2722 | * |
| 2723 | * Called from frontend fabric context to wait for storage engine |
| 2724 | * to pause and/or release frontend generated struct se_cmd. |
| 2725 | */ |
| 2726 | bool transport_wait_for_tasks(struct se_cmd *cmd) |
| 2727 | { |
| 2728 | unsigned long flags; |
| 2729 | |
| 2730 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
| 2731 | if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && |
| 2732 | !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) { |
| 2733 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
| 2734 | return false; |
| 2735 | } |
| 2736 | |
| 2737 | if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) && |
| 2738 | !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) { |
| 2739 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
| 2740 | return false; |
| 2741 | } |
| 2742 | /* |
| 2743 | * If we are already stopped due to an external event (ie: LUN shutdown) |
| 2744 | * sleep until the connection can have the passed struct se_cmd back. |
| 2745 | * The cmd->transport_lun_stopped_sem will be upped by |
| 2746 | * transport_clear_lun_from_sessions() once the ConfigFS context caller |
| 2747 | * has completed its operation on the struct se_cmd. |
| 2748 | */ |
| 2749 | if (cmd->transport_state & CMD_T_LUN_STOP) { |
| 2750 | pr_debug("wait_for_tasks: Stopping" |
| 2751 | " wait_for_completion(&cmd->t_tasktransport_lun_fe" |
| 2752 | "_stop_comp); for ITT: 0x%08x\n", |
| 2753 | cmd->se_tfo->get_task_tag(cmd)); |
| 2754 | /* |
| 2755 | * There is a special case for WRITES where a FE exception + |
| 2756 | * LUN shutdown means ConfigFS context is still sleeping on |
| 2757 | * transport_lun_stop_comp in transport_lun_wait_for_tasks(). |
| 2758 | * We go ahead and up transport_lun_stop_comp just to be sure |
| 2759 | * here. |
| 2760 | */ |
| 2761 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
| 2762 | complete(&cmd->transport_lun_stop_comp); |
| 2763 | wait_for_completion(&cmd->transport_lun_fe_stop_comp); |
| 2764 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
| 2765 | |
| 2766 | target_remove_from_state_list(cmd); |
| 2767 | /* |
| 2768 | * At this point, the frontend who was the originator of this |
| 2769 | * struct se_cmd, now owns the structure and can be released through |
| 2770 | * normal means below. |
| 2771 | */ |
| 2772 | pr_debug("wait_for_tasks: Stopped" |
| 2773 | " wait_for_completion(&cmd->t_tasktransport_lun_fe_" |
| 2774 | "stop_comp); for ITT: 0x%08x\n", |
| 2775 | cmd->se_tfo->get_task_tag(cmd)); |
| 2776 | |
| 2777 | cmd->transport_state &= ~CMD_T_LUN_STOP; |
| 2778 | } |
| 2779 | |
| 2780 | if (!(cmd->transport_state & CMD_T_ACTIVE)) { |
| 2781 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
| 2782 | return false; |
| 2783 | } |
| 2784 | |
| 2785 | cmd->transport_state |= CMD_T_STOP; |
| 2786 | |
| 2787 | pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x" |
| 2788 | " i_state: %d, t_state: %d, CMD_T_STOP\n", |
| 2789 | cmd, cmd->se_tfo->get_task_tag(cmd), |
| 2790 | cmd->se_tfo->get_cmd_state(cmd), cmd->t_state); |
| 2791 | |
| 2792 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
| 2793 | |
| 2794 | wait_for_completion(&cmd->t_transport_stop_comp); |
| 2795 | |
| 2796 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
| 2797 | cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP); |
| 2798 | |
| 2799 | pr_debug("wait_for_tasks: Stopped wait_for_compltion(" |
| 2800 | "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n", |
| 2801 | cmd->se_tfo->get_task_tag(cmd)); |
| 2802 | |
| 2803 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
| 2804 | |
| 2805 | return true; |
| 2806 | } |
| 2807 | EXPORT_SYMBOL(transport_wait_for_tasks); |
| 2808 | |
| 2809 | static int transport_get_sense_codes( |
| 2810 | struct se_cmd *cmd, |
| 2811 | u8 *asc, |
| 2812 | u8 *ascq) |
| 2813 | { |
| 2814 | *asc = cmd->scsi_asc; |
| 2815 | *ascq = cmd->scsi_ascq; |
| 2816 | |
| 2817 | return 0; |
| 2818 | } |
| 2819 | |
| 2820 | static int transport_set_sense_codes( |
| 2821 | struct se_cmd *cmd, |
| 2822 | u8 asc, |
| 2823 | u8 ascq) |
| 2824 | { |
| 2825 | cmd->scsi_asc = asc; |
| 2826 | cmd->scsi_ascq = ascq; |
| 2827 | |
| 2828 | return 0; |
| 2829 | } |
| 2830 | |
| 2831 | int transport_send_check_condition_and_sense( |
| 2832 | struct se_cmd *cmd, |
| 2833 | u8 reason, |
| 2834 | int from_transport) |
| 2835 | { |
| 2836 | unsigned char *buffer = cmd->sense_buffer; |
| 2837 | unsigned long flags; |
| 2838 | int offset; |
| 2839 | u8 asc = 0, ascq = 0; |
| 2840 | |
| 2841 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
| 2842 | if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) { |
| 2843 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
| 2844 | return 0; |
| 2845 | } |
| 2846 | cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION; |
| 2847 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
| 2848 | |
| 2849 | if (!reason && from_transport) |
| 2850 | goto after_reason; |
| 2851 | |
| 2852 | if (!from_transport) |
| 2853 | cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE; |
| 2854 | /* |
| 2855 | * Data Segment and SenseLength of the fabric response PDU. |
| 2856 | * |
| 2857 | * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE |
| 2858 | * from include/scsi/scsi_cmnd.h |
| 2859 | */ |
| 2860 | offset = cmd->se_tfo->set_fabric_sense_len(cmd, |
| 2861 | TRANSPORT_SENSE_BUFFER); |
| 2862 | /* |
| 2863 | * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses |
| 2864 | * SENSE KEY values from include/scsi/scsi.h |
| 2865 | */ |
| 2866 | switch (reason) { |
| 2867 | case TCM_NON_EXISTENT_LUN: |
| 2868 | /* CURRENT ERROR */ |
| 2869 | buffer[offset] = 0x70; |
| 2870 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
| 2871 | /* ILLEGAL REQUEST */ |
| 2872 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; |
| 2873 | /* LOGICAL UNIT NOT SUPPORTED */ |
| 2874 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25; |
| 2875 | break; |
| 2876 | case TCM_UNSUPPORTED_SCSI_OPCODE: |
| 2877 | case TCM_SECTOR_COUNT_TOO_MANY: |
| 2878 | /* CURRENT ERROR */ |
| 2879 | buffer[offset] = 0x70; |
| 2880 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
| 2881 | /* ILLEGAL REQUEST */ |
| 2882 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; |
| 2883 | /* INVALID COMMAND OPERATION CODE */ |
| 2884 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20; |
| 2885 | break; |
| 2886 | case TCM_UNKNOWN_MODE_PAGE: |
| 2887 | /* CURRENT ERROR */ |
| 2888 | buffer[offset] = 0x70; |
| 2889 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
| 2890 | /* ILLEGAL REQUEST */ |
| 2891 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; |
| 2892 | /* INVALID FIELD IN CDB */ |
| 2893 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24; |
| 2894 | break; |
| 2895 | case TCM_CHECK_CONDITION_ABORT_CMD: |
| 2896 | /* CURRENT ERROR */ |
| 2897 | buffer[offset] = 0x70; |
| 2898 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
| 2899 | /* ABORTED COMMAND */ |
| 2900 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; |
| 2901 | /* BUS DEVICE RESET FUNCTION OCCURRED */ |
| 2902 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29; |
| 2903 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03; |
| 2904 | break; |
| 2905 | case TCM_INCORRECT_AMOUNT_OF_DATA: |
| 2906 | /* CURRENT ERROR */ |
| 2907 | buffer[offset] = 0x70; |
| 2908 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
| 2909 | /* ABORTED COMMAND */ |
| 2910 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; |
| 2911 | /* WRITE ERROR */ |
| 2912 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c; |
| 2913 | /* NOT ENOUGH UNSOLICITED DATA */ |
| 2914 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d; |
| 2915 | break; |
| 2916 | case TCM_INVALID_CDB_FIELD: |
| 2917 | /* CURRENT ERROR */ |
| 2918 | buffer[offset] = 0x70; |
| 2919 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
| 2920 | /* ILLEGAL REQUEST */ |
| 2921 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; |
| 2922 | /* INVALID FIELD IN CDB */ |
| 2923 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24; |
| 2924 | break; |
| 2925 | case TCM_INVALID_PARAMETER_LIST: |
| 2926 | /* CURRENT ERROR */ |
| 2927 | buffer[offset] = 0x70; |
| 2928 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
| 2929 | /* ILLEGAL REQUEST */ |
| 2930 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; |
| 2931 | /* INVALID FIELD IN PARAMETER LIST */ |
| 2932 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26; |
| 2933 | break; |
| 2934 | case TCM_UNEXPECTED_UNSOLICITED_DATA: |
| 2935 | /* CURRENT ERROR */ |
| 2936 | buffer[offset] = 0x70; |
| 2937 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
| 2938 | /* ABORTED COMMAND */ |
| 2939 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; |
| 2940 | /* WRITE ERROR */ |
| 2941 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c; |
| 2942 | /* UNEXPECTED_UNSOLICITED_DATA */ |
| 2943 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c; |
| 2944 | break; |
| 2945 | case TCM_SERVICE_CRC_ERROR: |
| 2946 | /* CURRENT ERROR */ |
| 2947 | buffer[offset] = 0x70; |
| 2948 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
| 2949 | /* ABORTED COMMAND */ |
| 2950 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; |
| 2951 | /* PROTOCOL SERVICE CRC ERROR */ |
| 2952 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47; |
| 2953 | /* N/A */ |
| 2954 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05; |
| 2955 | break; |
| 2956 | case TCM_SNACK_REJECTED: |
| 2957 | /* CURRENT ERROR */ |
| 2958 | buffer[offset] = 0x70; |
| 2959 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
| 2960 | /* ABORTED COMMAND */ |
| 2961 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; |
| 2962 | /* READ ERROR */ |
| 2963 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11; |
| 2964 | /* FAILED RETRANSMISSION REQUEST */ |
| 2965 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13; |
| 2966 | break; |
| 2967 | case TCM_WRITE_PROTECTED: |
| 2968 | /* CURRENT ERROR */ |
| 2969 | buffer[offset] = 0x70; |
| 2970 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
| 2971 | /* DATA PROTECT */ |
| 2972 | buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT; |
| 2973 | /* WRITE PROTECTED */ |
| 2974 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27; |
| 2975 | break; |
| 2976 | case TCM_ADDRESS_OUT_OF_RANGE: |
| 2977 | /* CURRENT ERROR */ |
| 2978 | buffer[offset] = 0x70; |
| 2979 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
| 2980 | /* ILLEGAL REQUEST */ |
| 2981 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; |
| 2982 | /* LOGICAL BLOCK ADDRESS OUT OF RANGE */ |
| 2983 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x21; |
| 2984 | break; |
| 2985 | case TCM_CHECK_CONDITION_UNIT_ATTENTION: |
| 2986 | /* CURRENT ERROR */ |
| 2987 | buffer[offset] = 0x70; |
| 2988 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
| 2989 | /* UNIT ATTENTION */ |
| 2990 | buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION; |
| 2991 | core_scsi3_ua_for_check_condition(cmd, &asc, &ascq); |
| 2992 | buffer[offset+SPC_ASC_KEY_OFFSET] = asc; |
| 2993 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq; |
| 2994 | break; |
| 2995 | case TCM_CHECK_CONDITION_NOT_READY: |
| 2996 | /* CURRENT ERROR */ |
| 2997 | buffer[offset] = 0x70; |
| 2998 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
| 2999 | /* Not Ready */ |
| 3000 | buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY; |
| 3001 | transport_get_sense_codes(cmd, &asc, &ascq); |
| 3002 | buffer[offset+SPC_ASC_KEY_OFFSET] = asc; |
| 3003 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq; |
| 3004 | break; |
| 3005 | case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE: |
| 3006 | default: |
| 3007 | /* CURRENT ERROR */ |
| 3008 | buffer[offset] = 0x70; |
| 3009 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
| 3010 | /* ILLEGAL REQUEST */ |
| 3011 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; |
| 3012 | /* LOGICAL UNIT COMMUNICATION FAILURE */ |
| 3013 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80; |
| 3014 | break; |
| 3015 | } |
| 3016 | /* |
| 3017 | * This code uses linux/include/scsi/scsi.h SAM status codes! |
| 3018 | */ |
| 3019 | cmd->scsi_status = SAM_STAT_CHECK_CONDITION; |
| 3020 | /* |
| 3021 | * Automatically padded, this value is encoded in the fabric's |
| 3022 | * data_length response PDU containing the SCSI defined sense data. |
| 3023 | */ |
| 3024 | cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset; |
| 3025 | |
| 3026 | after_reason: |
| 3027 | return cmd->se_tfo->queue_status(cmd); |
| 3028 | } |
| 3029 | EXPORT_SYMBOL(transport_send_check_condition_and_sense); |
| 3030 | |
| 3031 | int transport_check_aborted_status(struct se_cmd *cmd, int send_status) |
| 3032 | { |
| 3033 | int ret = 0; |
| 3034 | |
| 3035 | if (cmd->transport_state & CMD_T_ABORTED) { |
| 3036 | if (!send_status || |
| 3037 | (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS)) |
| 3038 | return 1; |
| 3039 | |
| 3040 | pr_debug("Sending delayed SAM_STAT_TASK_ABORTED" |
| 3041 | " status for CDB: 0x%02x ITT: 0x%08x\n", |
| 3042 | cmd->t_task_cdb[0], |
| 3043 | cmd->se_tfo->get_task_tag(cmd)); |
| 3044 | |
| 3045 | cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS; |
| 3046 | cmd->se_tfo->queue_status(cmd); |
| 3047 | ret = 1; |
| 3048 | } |
| 3049 | return ret; |
| 3050 | } |
| 3051 | EXPORT_SYMBOL(transport_check_aborted_status); |
| 3052 | |
| 3053 | void transport_send_task_abort(struct se_cmd *cmd) |
| 3054 | { |
| 3055 | unsigned long flags; |
| 3056 | |
| 3057 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
| 3058 | if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) { |
| 3059 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
| 3060 | return; |
| 3061 | } |
| 3062 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
| 3063 | |
| 3064 | /* |
| 3065 | * If there are still expected incoming fabric WRITEs, we wait |
| 3066 | * until until they have completed before sending a TASK_ABORTED |
| 3067 | * response. This response with TASK_ABORTED status will be |
| 3068 | * queued back to fabric module by transport_check_aborted_status(). |
| 3069 | */ |
| 3070 | if (cmd->data_direction == DMA_TO_DEVICE) { |
| 3071 | if (cmd->se_tfo->write_pending_status(cmd) != 0) { |
| 3072 | cmd->transport_state |= CMD_T_ABORTED; |
| 3073 | smp_mb__after_atomic_inc(); |
| 3074 | } |
| 3075 | } |
| 3076 | cmd->scsi_status = SAM_STAT_TASK_ABORTED; |
| 3077 | |
| 3078 | pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x," |
| 3079 | " ITT: 0x%08x\n", cmd->t_task_cdb[0], |
| 3080 | cmd->se_tfo->get_task_tag(cmd)); |
| 3081 | |
| 3082 | cmd->se_tfo->queue_status(cmd); |
| 3083 | } |
| 3084 | |
| 3085 | static void target_tmr_work(struct work_struct *work) |
| 3086 | { |
| 3087 | struct se_cmd *cmd = container_of(work, struct se_cmd, work); |
| 3088 | struct se_device *dev = cmd->se_dev; |
| 3089 | struct se_tmr_req *tmr = cmd->se_tmr_req; |
| 3090 | int ret; |
| 3091 | |
| 3092 | switch (tmr->function) { |
| 3093 | case TMR_ABORT_TASK: |
| 3094 | core_tmr_abort_task(dev, tmr, cmd->se_sess); |
| 3095 | break; |
| 3096 | case TMR_ABORT_TASK_SET: |
| 3097 | case TMR_CLEAR_ACA: |
| 3098 | case TMR_CLEAR_TASK_SET: |
| 3099 | tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED; |
| 3100 | break; |
| 3101 | case TMR_LUN_RESET: |
| 3102 | ret = core_tmr_lun_reset(dev, tmr, NULL, NULL); |
| 3103 | tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE : |
| 3104 | TMR_FUNCTION_REJECTED; |
| 3105 | break; |
| 3106 | case TMR_TARGET_WARM_RESET: |
| 3107 | tmr->response = TMR_FUNCTION_REJECTED; |
| 3108 | break; |
| 3109 | case TMR_TARGET_COLD_RESET: |
| 3110 | tmr->response = TMR_FUNCTION_REJECTED; |
| 3111 | break; |
| 3112 | default: |
| 3113 | pr_err("Uknown TMR function: 0x%02x.\n", |
| 3114 | tmr->function); |
| 3115 | tmr->response = TMR_FUNCTION_REJECTED; |
| 3116 | break; |
| 3117 | } |
| 3118 | |
| 3119 | cmd->t_state = TRANSPORT_ISTATE_PROCESSING; |
| 3120 | cmd->se_tfo->queue_tm_rsp(cmd); |
| 3121 | |
| 3122 | transport_cmd_check_stop_to_fabric(cmd); |
| 3123 | } |
| 3124 | |
| 3125 | int transport_generic_handle_tmr( |
| 3126 | struct se_cmd *cmd) |
| 3127 | { |
| 3128 | INIT_WORK(&cmd->work, target_tmr_work); |
| 3129 | queue_work(cmd->se_dev->tmr_wq, &cmd->work); |
| 3130 | return 0; |
| 3131 | } |
| 3132 | EXPORT_SYMBOL(transport_generic_handle_tmr); |