target_core_transport.c 79 KB

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  1. /*******************************************************************************
  2. * Filename: target_core_transport.c
  3. *
  4. * This file contains the Generic Target Engine Core.
  5. *
  6. * (c) Copyright 2002-2013 Datera, Inc.
  7. *
  8. * Nicholas A. Bellinger <nab@kernel.org>
  9. *
  10. * This program is free software; you can redistribute it and/or modify
  11. * it under the terms of the GNU General Public License as published by
  12. * the Free Software Foundation; either version 2 of the License, or
  13. * (at your option) any later version.
  14. *
  15. * This program is distributed in the hope that it will be useful,
  16. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  18. * GNU General Public License for more details.
  19. *
  20. * You should have received a copy of the GNU General Public License
  21. * along with this program; if not, write to the Free Software
  22. * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  23. *
  24. ******************************************************************************/
  25. #include <linux/net.h>
  26. #include <linux/delay.h>
  27. #include <linux/string.h>
  28. #include <linux/timer.h>
  29. #include <linux/slab.h>
  30. #include <linux/spinlock.h>
  31. #include <linux/kthread.h>
  32. #include <linux/in.h>
  33. #include <linux/cdrom.h>
  34. #include <linux/module.h>
  35. #include <linux/ratelimit.h>
  36. #include <asm/unaligned.h>
  37. #include <net/sock.h>
  38. #include <net/tcp.h>
  39. #include <scsi/scsi.h>
  40. #include <scsi/scsi_cmnd.h>
  41. #include <scsi/scsi_tcq.h>
  42. #include <target/target_core_base.h>
  43. #include <target/target_core_backend.h>
  44. #include <target/target_core_fabric.h>
  45. #include <target/target_core_configfs.h>
  46. #include "target_core_internal.h"
  47. #include "target_core_alua.h"
  48. #include "target_core_pr.h"
  49. #include "target_core_ua.h"
  50. #define CREATE_TRACE_POINTS
  51. #include <trace/events/target.h>
  52. static struct workqueue_struct *target_completion_wq;
  53. static struct kmem_cache *se_sess_cache;
  54. struct kmem_cache *se_ua_cache;
  55. struct kmem_cache *t10_pr_reg_cache;
  56. struct kmem_cache *t10_alua_lu_gp_cache;
  57. struct kmem_cache *t10_alua_lu_gp_mem_cache;
  58. struct kmem_cache *t10_alua_tg_pt_gp_cache;
  59. struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
  60. struct kmem_cache *t10_alua_lba_map_cache;
  61. struct kmem_cache *t10_alua_lba_map_mem_cache;
  62. static void transport_complete_task_attr(struct se_cmd *cmd);
  63. static void transport_handle_queue_full(struct se_cmd *cmd,
  64. struct se_device *dev);
  65. static int transport_put_cmd(struct se_cmd *cmd);
  66. static void target_complete_ok_work(struct work_struct *work);
  67. int init_se_kmem_caches(void)
  68. {
  69. se_sess_cache = kmem_cache_create("se_sess_cache",
  70. sizeof(struct se_session), __alignof__(struct se_session),
  71. 0, NULL);
  72. if (!se_sess_cache) {
  73. pr_err("kmem_cache_create() for struct se_session"
  74. " failed\n");
  75. goto out;
  76. }
  77. se_ua_cache = kmem_cache_create("se_ua_cache",
  78. sizeof(struct se_ua), __alignof__(struct se_ua),
  79. 0, NULL);
  80. if (!se_ua_cache) {
  81. pr_err("kmem_cache_create() for struct se_ua failed\n");
  82. goto out_free_sess_cache;
  83. }
  84. t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
  85. sizeof(struct t10_pr_registration),
  86. __alignof__(struct t10_pr_registration), 0, NULL);
  87. if (!t10_pr_reg_cache) {
  88. pr_err("kmem_cache_create() for struct t10_pr_registration"
  89. " failed\n");
  90. goto out_free_ua_cache;
  91. }
  92. t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
  93. sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
  94. 0, NULL);
  95. if (!t10_alua_lu_gp_cache) {
  96. pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
  97. " failed\n");
  98. goto out_free_pr_reg_cache;
  99. }
  100. t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
  101. sizeof(struct t10_alua_lu_gp_member),
  102. __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
  103. if (!t10_alua_lu_gp_mem_cache) {
  104. pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
  105. "cache failed\n");
  106. goto out_free_lu_gp_cache;
  107. }
  108. t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
  109. sizeof(struct t10_alua_tg_pt_gp),
  110. __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
  111. if (!t10_alua_tg_pt_gp_cache) {
  112. pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
  113. "cache failed\n");
  114. goto out_free_lu_gp_mem_cache;
  115. }
  116. t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
  117. "t10_alua_tg_pt_gp_mem_cache",
  118. sizeof(struct t10_alua_tg_pt_gp_member),
  119. __alignof__(struct t10_alua_tg_pt_gp_member),
  120. 0, NULL);
  121. if (!t10_alua_tg_pt_gp_mem_cache) {
  122. pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
  123. "mem_t failed\n");
  124. goto out_free_tg_pt_gp_cache;
  125. }
  126. t10_alua_lba_map_cache = kmem_cache_create(
  127. "t10_alua_lba_map_cache",
  128. sizeof(struct t10_alua_lba_map),
  129. __alignof__(struct t10_alua_lba_map), 0, NULL);
  130. if (!t10_alua_lba_map_cache) {
  131. pr_err("kmem_cache_create() for t10_alua_lba_map_"
  132. "cache failed\n");
  133. goto out_free_tg_pt_gp_mem_cache;
  134. }
  135. t10_alua_lba_map_mem_cache = kmem_cache_create(
  136. "t10_alua_lba_map_mem_cache",
  137. sizeof(struct t10_alua_lba_map_member),
  138. __alignof__(struct t10_alua_lba_map_member), 0, NULL);
  139. if (!t10_alua_lba_map_mem_cache) {
  140. pr_err("kmem_cache_create() for t10_alua_lba_map_mem_"
  141. "cache failed\n");
  142. goto out_free_lba_map_cache;
  143. }
  144. target_completion_wq = alloc_workqueue("target_completion",
  145. WQ_MEM_RECLAIM, 0);
  146. if (!target_completion_wq)
  147. goto out_free_lba_map_mem_cache;
  148. return 0;
  149. out_free_lba_map_mem_cache:
  150. kmem_cache_destroy(t10_alua_lba_map_mem_cache);
  151. out_free_lba_map_cache:
  152. kmem_cache_destroy(t10_alua_lba_map_cache);
  153. out_free_tg_pt_gp_mem_cache:
  154. kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
  155. out_free_tg_pt_gp_cache:
  156. kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
  157. out_free_lu_gp_mem_cache:
  158. kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
  159. out_free_lu_gp_cache:
  160. kmem_cache_destroy(t10_alua_lu_gp_cache);
  161. out_free_pr_reg_cache:
  162. kmem_cache_destroy(t10_pr_reg_cache);
  163. out_free_ua_cache:
  164. kmem_cache_destroy(se_ua_cache);
  165. out_free_sess_cache:
  166. kmem_cache_destroy(se_sess_cache);
  167. out:
  168. return -ENOMEM;
  169. }
  170. void release_se_kmem_caches(void)
  171. {
  172. destroy_workqueue(target_completion_wq);
  173. kmem_cache_destroy(se_sess_cache);
  174. kmem_cache_destroy(se_ua_cache);
  175. kmem_cache_destroy(t10_pr_reg_cache);
  176. kmem_cache_destroy(t10_alua_lu_gp_cache);
  177. kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
  178. kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
  179. kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
  180. kmem_cache_destroy(t10_alua_lba_map_cache);
  181. kmem_cache_destroy(t10_alua_lba_map_mem_cache);
  182. }
  183. /* This code ensures unique mib indexes are handed out. */
  184. static DEFINE_SPINLOCK(scsi_mib_index_lock);
  185. static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
  186. /*
  187. * Allocate a new row index for the entry type specified
  188. */
  189. u32 scsi_get_new_index(scsi_index_t type)
  190. {
  191. u32 new_index;
  192. BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
  193. spin_lock(&scsi_mib_index_lock);
  194. new_index = ++scsi_mib_index[type];
  195. spin_unlock(&scsi_mib_index_lock);
  196. return new_index;
  197. }
  198. void transport_subsystem_check_init(void)
  199. {
  200. int ret;
  201. static int sub_api_initialized;
  202. if (sub_api_initialized)
  203. return;
  204. ret = request_module("target_core_iblock");
  205. if (ret != 0)
  206. pr_err("Unable to load target_core_iblock\n");
  207. ret = request_module("target_core_file");
  208. if (ret != 0)
  209. pr_err("Unable to load target_core_file\n");
  210. ret = request_module("target_core_pscsi");
  211. if (ret != 0)
  212. pr_err("Unable to load target_core_pscsi\n");
  213. ret = request_module("target_core_user");
  214. if (ret != 0)
  215. pr_err("Unable to load target_core_user\n");
  216. sub_api_initialized = 1;
  217. }
  218. struct se_session *transport_init_session(enum target_prot_op sup_prot_ops)
  219. {
  220. struct se_session *se_sess;
  221. se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
  222. if (!se_sess) {
  223. pr_err("Unable to allocate struct se_session from"
  224. " se_sess_cache\n");
  225. return ERR_PTR(-ENOMEM);
  226. }
  227. INIT_LIST_HEAD(&se_sess->sess_list);
  228. INIT_LIST_HEAD(&se_sess->sess_acl_list);
  229. INIT_LIST_HEAD(&se_sess->sess_cmd_list);
  230. INIT_LIST_HEAD(&se_sess->sess_wait_list);
  231. spin_lock_init(&se_sess->sess_cmd_lock);
  232. kref_init(&se_sess->sess_kref);
  233. se_sess->sup_prot_ops = sup_prot_ops;
  234. return se_sess;
  235. }
  236. EXPORT_SYMBOL(transport_init_session);
  237. int transport_alloc_session_tags(struct se_session *se_sess,
  238. unsigned int tag_num, unsigned int tag_size)
  239. {
  240. int rc;
  241. se_sess->sess_cmd_map = kzalloc(tag_num * tag_size,
  242. GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
  243. if (!se_sess->sess_cmd_map) {
  244. se_sess->sess_cmd_map = vzalloc(tag_num * tag_size);
  245. if (!se_sess->sess_cmd_map) {
  246. pr_err("Unable to allocate se_sess->sess_cmd_map\n");
  247. return -ENOMEM;
  248. }
  249. }
  250. rc = percpu_ida_init(&se_sess->sess_tag_pool, tag_num);
  251. if (rc < 0) {
  252. pr_err("Unable to init se_sess->sess_tag_pool,"
  253. " tag_num: %u\n", tag_num);
  254. if (is_vmalloc_addr(se_sess->sess_cmd_map))
  255. vfree(se_sess->sess_cmd_map);
  256. else
  257. kfree(se_sess->sess_cmd_map);
  258. se_sess->sess_cmd_map = NULL;
  259. return -ENOMEM;
  260. }
  261. return 0;
  262. }
  263. EXPORT_SYMBOL(transport_alloc_session_tags);
  264. struct se_session *transport_init_session_tags(unsigned int tag_num,
  265. unsigned int tag_size,
  266. enum target_prot_op sup_prot_ops)
  267. {
  268. struct se_session *se_sess;
  269. int rc;
  270. se_sess = transport_init_session(sup_prot_ops);
  271. if (IS_ERR(se_sess))
  272. return se_sess;
  273. rc = transport_alloc_session_tags(se_sess, tag_num, tag_size);
  274. if (rc < 0) {
  275. transport_free_session(se_sess);
  276. return ERR_PTR(-ENOMEM);
  277. }
  278. return se_sess;
  279. }
  280. EXPORT_SYMBOL(transport_init_session_tags);
  281. /*
  282. * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
  283. */
  284. void __transport_register_session(
  285. struct se_portal_group *se_tpg,
  286. struct se_node_acl *se_nacl,
  287. struct se_session *se_sess,
  288. void *fabric_sess_ptr)
  289. {
  290. unsigned char buf[PR_REG_ISID_LEN];
  291. se_sess->se_tpg = se_tpg;
  292. se_sess->fabric_sess_ptr = fabric_sess_ptr;
  293. /*
  294. * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
  295. *
  296. * Only set for struct se_session's that will actually be moving I/O.
  297. * eg: *NOT* discovery sessions.
  298. */
  299. if (se_nacl) {
  300. /*
  301. * If the fabric module supports an ISID based TransportID,
  302. * save this value in binary from the fabric I_T Nexus now.
  303. */
  304. if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
  305. memset(&buf[0], 0, PR_REG_ISID_LEN);
  306. se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
  307. &buf[0], PR_REG_ISID_LEN);
  308. se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
  309. }
  310. kref_get(&se_nacl->acl_kref);
  311. spin_lock_irq(&se_nacl->nacl_sess_lock);
  312. /*
  313. * The se_nacl->nacl_sess pointer will be set to the
  314. * last active I_T Nexus for each struct se_node_acl.
  315. */
  316. se_nacl->nacl_sess = se_sess;
  317. list_add_tail(&se_sess->sess_acl_list,
  318. &se_nacl->acl_sess_list);
  319. spin_unlock_irq(&se_nacl->nacl_sess_lock);
  320. }
  321. list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
  322. pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
  323. se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
  324. }
  325. EXPORT_SYMBOL(__transport_register_session);
  326. void transport_register_session(
  327. struct se_portal_group *se_tpg,
  328. struct se_node_acl *se_nacl,
  329. struct se_session *se_sess,
  330. void *fabric_sess_ptr)
  331. {
  332. unsigned long flags;
  333. spin_lock_irqsave(&se_tpg->session_lock, flags);
  334. __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
  335. spin_unlock_irqrestore(&se_tpg->session_lock, flags);
  336. }
  337. EXPORT_SYMBOL(transport_register_session);
  338. static void target_release_session(struct kref *kref)
  339. {
  340. struct se_session *se_sess = container_of(kref,
  341. struct se_session, sess_kref);
  342. struct se_portal_group *se_tpg = se_sess->se_tpg;
  343. se_tpg->se_tpg_tfo->close_session(se_sess);
  344. }
  345. void target_get_session(struct se_session *se_sess)
  346. {
  347. kref_get(&se_sess->sess_kref);
  348. }
  349. EXPORT_SYMBOL(target_get_session);
  350. void target_put_session(struct se_session *se_sess)
  351. {
  352. struct se_portal_group *tpg = se_sess->se_tpg;
  353. if (tpg->se_tpg_tfo->put_session != NULL) {
  354. tpg->se_tpg_tfo->put_session(se_sess);
  355. return;
  356. }
  357. kref_put(&se_sess->sess_kref, target_release_session);
  358. }
  359. EXPORT_SYMBOL(target_put_session);
  360. static void target_complete_nacl(struct kref *kref)
  361. {
  362. struct se_node_acl *nacl = container_of(kref,
  363. struct se_node_acl, acl_kref);
  364. complete(&nacl->acl_free_comp);
  365. }
  366. void target_put_nacl(struct se_node_acl *nacl)
  367. {
  368. kref_put(&nacl->acl_kref, target_complete_nacl);
  369. }
  370. void transport_deregister_session_configfs(struct se_session *se_sess)
  371. {
  372. struct se_node_acl *se_nacl;
  373. unsigned long flags;
  374. /*
  375. * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
  376. */
  377. se_nacl = se_sess->se_node_acl;
  378. if (se_nacl) {
  379. spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
  380. if (se_nacl->acl_stop == 0)
  381. list_del(&se_sess->sess_acl_list);
  382. /*
  383. * If the session list is empty, then clear the pointer.
  384. * Otherwise, set the struct se_session pointer from the tail
  385. * element of the per struct se_node_acl active session list.
  386. */
  387. if (list_empty(&se_nacl->acl_sess_list))
  388. se_nacl->nacl_sess = NULL;
  389. else {
  390. se_nacl->nacl_sess = container_of(
  391. se_nacl->acl_sess_list.prev,
  392. struct se_session, sess_acl_list);
  393. }
  394. spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
  395. }
  396. }
  397. EXPORT_SYMBOL(transport_deregister_session_configfs);
  398. void transport_free_session(struct se_session *se_sess)
  399. {
  400. if (se_sess->sess_cmd_map) {
  401. percpu_ida_destroy(&se_sess->sess_tag_pool);
  402. if (is_vmalloc_addr(se_sess->sess_cmd_map))
  403. vfree(se_sess->sess_cmd_map);
  404. else
  405. kfree(se_sess->sess_cmd_map);
  406. }
  407. kmem_cache_free(se_sess_cache, se_sess);
  408. }
  409. EXPORT_SYMBOL(transport_free_session);
  410. void transport_deregister_session(struct se_session *se_sess)
  411. {
  412. struct se_portal_group *se_tpg = se_sess->se_tpg;
  413. struct target_core_fabric_ops *se_tfo;
  414. struct se_node_acl *se_nacl;
  415. unsigned long flags;
  416. bool comp_nacl = true;
  417. if (!se_tpg) {
  418. transport_free_session(se_sess);
  419. return;
  420. }
  421. se_tfo = se_tpg->se_tpg_tfo;
  422. spin_lock_irqsave(&se_tpg->session_lock, flags);
  423. list_del(&se_sess->sess_list);
  424. se_sess->se_tpg = NULL;
  425. se_sess->fabric_sess_ptr = NULL;
  426. spin_unlock_irqrestore(&se_tpg->session_lock, flags);
  427. /*
  428. * Determine if we need to do extra work for this initiator node's
  429. * struct se_node_acl if it had been previously dynamically generated.
  430. */
  431. se_nacl = se_sess->se_node_acl;
  432. spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
  433. if (se_nacl && se_nacl->dynamic_node_acl) {
  434. if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
  435. list_del(&se_nacl->acl_list);
  436. se_tpg->num_node_acls--;
  437. spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
  438. core_tpg_wait_for_nacl_pr_ref(se_nacl);
  439. core_free_device_list_for_node(se_nacl, se_tpg);
  440. se_tfo->tpg_release_fabric_acl(se_tpg, se_nacl);
  441. comp_nacl = false;
  442. spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
  443. }
  444. }
  445. spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
  446. pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
  447. se_tpg->se_tpg_tfo->get_fabric_name());
  448. /*
  449. * If last kref is dropping now for an explicit NodeACL, awake sleeping
  450. * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
  451. * removal context.
  452. */
  453. if (se_nacl && comp_nacl)
  454. target_put_nacl(se_nacl);
  455. transport_free_session(se_sess);
  456. }
  457. EXPORT_SYMBOL(transport_deregister_session);
  458. /*
  459. * Called with cmd->t_state_lock held.
  460. */
  461. static void target_remove_from_state_list(struct se_cmd *cmd)
  462. {
  463. struct se_device *dev = cmd->se_dev;
  464. unsigned long flags;
  465. if (!dev)
  466. return;
  467. if (cmd->transport_state & CMD_T_BUSY)
  468. return;
  469. spin_lock_irqsave(&dev->execute_task_lock, flags);
  470. if (cmd->state_active) {
  471. list_del(&cmd->state_list);
  472. cmd->state_active = false;
  473. }
  474. spin_unlock_irqrestore(&dev->execute_task_lock, flags);
  475. }
  476. static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists,
  477. bool write_pending)
  478. {
  479. unsigned long flags;
  480. spin_lock_irqsave(&cmd->t_state_lock, flags);
  481. if (write_pending)
  482. cmd->t_state = TRANSPORT_WRITE_PENDING;
  483. if (remove_from_lists) {
  484. target_remove_from_state_list(cmd);
  485. /*
  486. * Clear struct se_cmd->se_lun before the handoff to FE.
  487. */
  488. cmd->se_lun = NULL;
  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. spin_unlock_irqrestore(&cmd->t_state_lock, flags);
  499. complete_all(&cmd->t_transport_stop_comp);
  500. return 1;
  501. }
  502. cmd->transport_state &= ~CMD_T_ACTIVE;
  503. if (remove_from_lists) {
  504. /*
  505. * Some fabric modules like tcm_loop can release
  506. * their internally allocated I/O reference now and
  507. * struct se_cmd now.
  508. *
  509. * Fabric modules are expected to return '1' here if the
  510. * se_cmd being passed is released at this point,
  511. * or zero if not being released.
  512. */
  513. if (cmd->se_tfo->check_stop_free != NULL) {
  514. spin_unlock_irqrestore(&cmd->t_state_lock, flags);
  515. return cmd->se_tfo->check_stop_free(cmd);
  516. }
  517. }
  518. spin_unlock_irqrestore(&cmd->t_state_lock, flags);
  519. return 0;
  520. }
  521. static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
  522. {
  523. return transport_cmd_check_stop(cmd, true, false);
  524. }
  525. static void transport_lun_remove_cmd(struct se_cmd *cmd)
  526. {
  527. struct se_lun *lun = cmd->se_lun;
  528. if (!lun)
  529. return;
  530. if (cmpxchg(&cmd->lun_ref_active, true, false))
  531. percpu_ref_put(&lun->lun_ref);
  532. }
  533. void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
  534. {
  535. if (cmd->se_cmd_flags & SCF_SE_LUN_CMD)
  536. transport_lun_remove_cmd(cmd);
  537. /*
  538. * Allow the fabric driver to unmap any resources before
  539. * releasing the descriptor via TFO->release_cmd()
  540. */
  541. if (remove)
  542. cmd->se_tfo->aborted_task(cmd);
  543. if (transport_cmd_check_stop_to_fabric(cmd))
  544. return;
  545. if (remove)
  546. transport_put_cmd(cmd);
  547. }
  548. static void target_complete_failure_work(struct work_struct *work)
  549. {
  550. struct se_cmd *cmd = container_of(work, struct se_cmd, work);
  551. transport_generic_request_failure(cmd,
  552. TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE);
  553. }
  554. /*
  555. * Used when asking transport to copy Sense Data from the underlying
  556. * Linux/SCSI struct scsi_cmnd
  557. */
  558. static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd)
  559. {
  560. struct se_device *dev = cmd->se_dev;
  561. WARN_ON(!cmd->se_lun);
  562. if (!dev)
  563. return NULL;
  564. if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION)
  565. return NULL;
  566. cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
  567. pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
  568. dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
  569. return cmd->sense_buffer;
  570. }
  571. void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
  572. {
  573. struct se_device *dev = cmd->se_dev;
  574. int success = scsi_status == GOOD;
  575. unsigned long flags;
  576. cmd->scsi_status = scsi_status;
  577. spin_lock_irqsave(&cmd->t_state_lock, flags);
  578. cmd->transport_state &= ~CMD_T_BUSY;
  579. if (dev && dev->transport->transport_complete) {
  580. dev->transport->transport_complete(cmd,
  581. cmd->t_data_sg,
  582. transport_get_sense_buffer(cmd));
  583. if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
  584. success = 1;
  585. }
  586. /*
  587. * See if we are waiting to complete for an exception condition.
  588. */
  589. if (cmd->transport_state & CMD_T_REQUEST_STOP) {
  590. spin_unlock_irqrestore(&cmd->t_state_lock, flags);
  591. complete(&cmd->task_stop_comp);
  592. return;
  593. }
  594. /*
  595. * Check for case where an explicit ABORT_TASK has been received
  596. * and transport_wait_for_tasks() will be waiting for completion..
  597. */
  598. if (cmd->transport_state & CMD_T_ABORTED &&
  599. cmd->transport_state & CMD_T_STOP) {
  600. spin_unlock_irqrestore(&cmd->t_state_lock, flags);
  601. complete_all(&cmd->t_transport_stop_comp);
  602. return;
  603. } else if (!success) {
  604. INIT_WORK(&cmd->work, target_complete_failure_work);
  605. } else {
  606. INIT_WORK(&cmd->work, target_complete_ok_work);
  607. }
  608. cmd->t_state = TRANSPORT_COMPLETE;
  609. cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
  610. spin_unlock_irqrestore(&cmd->t_state_lock, flags);
  611. queue_work(target_completion_wq, &cmd->work);
  612. }
  613. EXPORT_SYMBOL(target_complete_cmd);
  614. void target_complete_cmd_with_length(struct se_cmd *cmd, u8 scsi_status, int length)
  615. {
  616. if (scsi_status == SAM_STAT_GOOD && length < cmd->data_length) {
  617. if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
  618. cmd->residual_count += cmd->data_length - length;
  619. } else {
  620. cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
  621. cmd->residual_count = cmd->data_length - length;
  622. }
  623. cmd->data_length = length;
  624. }
  625. target_complete_cmd(cmd, scsi_status);
  626. }
  627. EXPORT_SYMBOL(target_complete_cmd_with_length);
  628. static void target_add_to_state_list(struct se_cmd *cmd)
  629. {
  630. struct se_device *dev = cmd->se_dev;
  631. unsigned long flags;
  632. spin_lock_irqsave(&dev->execute_task_lock, flags);
  633. if (!cmd->state_active) {
  634. list_add_tail(&cmd->state_list, &dev->state_list);
  635. cmd->state_active = true;
  636. }
  637. spin_unlock_irqrestore(&dev->execute_task_lock, flags);
  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. void target_qf_do_work(struct work_struct *work)
  645. {
  646. struct se_device *dev = container_of(work, struct se_device,
  647. qf_work_queue);
  648. LIST_HEAD(qf_cmd_list);
  649. struct se_cmd *cmd, *cmd_tmp;
  650. spin_lock_irq(&dev->qf_cmd_lock);
  651. list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
  652. spin_unlock_irq(&dev->qf_cmd_lock);
  653. list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
  654. list_del(&cmd->se_qf_node);
  655. atomic_dec_mb(&dev->dev_qf_count);
  656. pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
  657. " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
  658. (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
  659. (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
  660. : "UNKNOWN");
  661. if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
  662. transport_write_pending_qf(cmd);
  663. else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK)
  664. transport_complete_qf(cmd);
  665. }
  666. }
  667. unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
  668. {
  669. switch (cmd->data_direction) {
  670. case DMA_NONE:
  671. return "NONE";
  672. case DMA_FROM_DEVICE:
  673. return "READ";
  674. case DMA_TO_DEVICE:
  675. return "WRITE";
  676. case DMA_BIDIRECTIONAL:
  677. return "BIDI";
  678. default:
  679. break;
  680. }
  681. return "UNKNOWN";
  682. }
  683. void transport_dump_dev_state(
  684. struct se_device *dev,
  685. char *b,
  686. int *bl)
  687. {
  688. *bl += sprintf(b + *bl, "Status: ");
  689. if (dev->export_count)
  690. *bl += sprintf(b + *bl, "ACTIVATED");
  691. else
  692. *bl += sprintf(b + *bl, "DEACTIVATED");
  693. *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth);
  694. *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
  695. dev->dev_attrib.block_size,
  696. dev->dev_attrib.hw_max_sectors);
  697. *bl += sprintf(b + *bl, " ");
  698. }
  699. void transport_dump_vpd_proto_id(
  700. struct t10_vpd *vpd,
  701. unsigned char *p_buf,
  702. int p_buf_len)
  703. {
  704. unsigned char buf[VPD_TMP_BUF_SIZE];
  705. int len;
  706. memset(buf, 0, VPD_TMP_BUF_SIZE);
  707. len = sprintf(buf, "T10 VPD Protocol Identifier: ");
  708. switch (vpd->protocol_identifier) {
  709. case 0x00:
  710. sprintf(buf+len, "Fibre Channel\n");
  711. break;
  712. case 0x10:
  713. sprintf(buf+len, "Parallel SCSI\n");
  714. break;
  715. case 0x20:
  716. sprintf(buf+len, "SSA\n");
  717. break;
  718. case 0x30:
  719. sprintf(buf+len, "IEEE 1394\n");
  720. break;
  721. case 0x40:
  722. sprintf(buf+len, "SCSI Remote Direct Memory Access"
  723. " Protocol\n");
  724. break;
  725. case 0x50:
  726. sprintf(buf+len, "Internet SCSI (iSCSI)\n");
  727. break;
  728. case 0x60:
  729. sprintf(buf+len, "SAS Serial SCSI Protocol\n");
  730. break;
  731. case 0x70:
  732. sprintf(buf+len, "Automation/Drive Interface Transport"
  733. " Protocol\n");
  734. break;
  735. case 0x80:
  736. sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
  737. break;
  738. default:
  739. sprintf(buf+len, "Unknown 0x%02x\n",
  740. vpd->protocol_identifier);
  741. break;
  742. }
  743. if (p_buf)
  744. strncpy(p_buf, buf, p_buf_len);
  745. else
  746. pr_debug("%s", buf);
  747. }
  748. void
  749. transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
  750. {
  751. /*
  752. * Check if the Protocol Identifier Valid (PIV) bit is set..
  753. *
  754. * from spc3r23.pdf section 7.5.1
  755. */
  756. if (page_83[1] & 0x80) {
  757. vpd->protocol_identifier = (page_83[0] & 0xf0);
  758. vpd->protocol_identifier_set = 1;
  759. transport_dump_vpd_proto_id(vpd, NULL, 0);
  760. }
  761. }
  762. EXPORT_SYMBOL(transport_set_vpd_proto_id);
  763. int transport_dump_vpd_assoc(
  764. struct t10_vpd *vpd,
  765. unsigned char *p_buf,
  766. int p_buf_len)
  767. {
  768. unsigned char buf[VPD_TMP_BUF_SIZE];
  769. int ret = 0;
  770. int len;
  771. memset(buf, 0, VPD_TMP_BUF_SIZE);
  772. len = sprintf(buf, "T10 VPD Identifier Association: ");
  773. switch (vpd->association) {
  774. case 0x00:
  775. sprintf(buf+len, "addressed logical unit\n");
  776. break;
  777. case 0x10:
  778. sprintf(buf+len, "target port\n");
  779. break;
  780. case 0x20:
  781. sprintf(buf+len, "SCSI target device\n");
  782. break;
  783. default:
  784. sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
  785. ret = -EINVAL;
  786. break;
  787. }
  788. if (p_buf)
  789. strncpy(p_buf, buf, p_buf_len);
  790. else
  791. pr_debug("%s", buf);
  792. return ret;
  793. }
  794. int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
  795. {
  796. /*
  797. * The VPD identification association..
  798. *
  799. * from spc3r23.pdf Section 7.6.3.1 Table 297
  800. */
  801. vpd->association = (page_83[1] & 0x30);
  802. return transport_dump_vpd_assoc(vpd, NULL, 0);
  803. }
  804. EXPORT_SYMBOL(transport_set_vpd_assoc);
  805. int transport_dump_vpd_ident_type(
  806. struct t10_vpd *vpd,
  807. unsigned char *p_buf,
  808. int p_buf_len)
  809. {
  810. unsigned char buf[VPD_TMP_BUF_SIZE];
  811. int ret = 0;
  812. int len;
  813. memset(buf, 0, VPD_TMP_BUF_SIZE);
  814. len = sprintf(buf, "T10 VPD Identifier Type: ");
  815. switch (vpd->device_identifier_type) {
  816. case 0x00:
  817. sprintf(buf+len, "Vendor specific\n");
  818. break;
  819. case 0x01:
  820. sprintf(buf+len, "T10 Vendor ID based\n");
  821. break;
  822. case 0x02:
  823. sprintf(buf+len, "EUI-64 based\n");
  824. break;
  825. case 0x03:
  826. sprintf(buf+len, "NAA\n");
  827. break;
  828. case 0x04:
  829. sprintf(buf+len, "Relative target port identifier\n");
  830. break;
  831. case 0x08:
  832. sprintf(buf+len, "SCSI name string\n");
  833. break;
  834. default:
  835. sprintf(buf+len, "Unsupported: 0x%02x\n",
  836. vpd->device_identifier_type);
  837. ret = -EINVAL;
  838. break;
  839. }
  840. if (p_buf) {
  841. if (p_buf_len < strlen(buf)+1)
  842. return -EINVAL;
  843. strncpy(p_buf, buf, p_buf_len);
  844. } else {
  845. pr_debug("%s", buf);
  846. }
  847. return ret;
  848. }
  849. int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
  850. {
  851. /*
  852. * The VPD identifier type..
  853. *
  854. * from spc3r23.pdf Section 7.6.3.1 Table 298
  855. */
  856. vpd->device_identifier_type = (page_83[1] & 0x0f);
  857. return transport_dump_vpd_ident_type(vpd, NULL, 0);
  858. }
  859. EXPORT_SYMBOL(transport_set_vpd_ident_type);
  860. int transport_dump_vpd_ident(
  861. struct t10_vpd *vpd,
  862. unsigned char *p_buf,
  863. int p_buf_len)
  864. {
  865. unsigned char buf[VPD_TMP_BUF_SIZE];
  866. int ret = 0;
  867. memset(buf, 0, VPD_TMP_BUF_SIZE);
  868. switch (vpd->device_identifier_code_set) {
  869. case 0x01: /* Binary */
  870. snprintf(buf, sizeof(buf),
  871. "T10 VPD Binary Device Identifier: %s\n",
  872. &vpd->device_identifier[0]);
  873. break;
  874. case 0x02: /* ASCII */
  875. snprintf(buf, sizeof(buf),
  876. "T10 VPD ASCII Device Identifier: %s\n",
  877. &vpd->device_identifier[0]);
  878. break;
  879. case 0x03: /* UTF-8 */
  880. snprintf(buf, sizeof(buf),
  881. "T10 VPD UTF-8 Device Identifier: %s\n",
  882. &vpd->device_identifier[0]);
  883. break;
  884. default:
  885. sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
  886. " 0x%02x", vpd->device_identifier_code_set);
  887. ret = -EINVAL;
  888. break;
  889. }
  890. if (p_buf)
  891. strncpy(p_buf, buf, p_buf_len);
  892. else
  893. pr_debug("%s", buf);
  894. return ret;
  895. }
  896. int
  897. transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
  898. {
  899. static const char hex_str[] = "0123456789abcdef";
  900. int j = 0, i = 4; /* offset to start of the identifier */
  901. /*
  902. * The VPD Code Set (encoding)
  903. *
  904. * from spc3r23.pdf Section 7.6.3.1 Table 296
  905. */
  906. vpd->device_identifier_code_set = (page_83[0] & 0x0f);
  907. switch (vpd->device_identifier_code_set) {
  908. case 0x01: /* Binary */
  909. vpd->device_identifier[j++] =
  910. hex_str[vpd->device_identifier_type];
  911. while (i < (4 + page_83[3])) {
  912. vpd->device_identifier[j++] =
  913. hex_str[(page_83[i] & 0xf0) >> 4];
  914. vpd->device_identifier[j++] =
  915. hex_str[page_83[i] & 0x0f];
  916. i++;
  917. }
  918. break;
  919. case 0x02: /* ASCII */
  920. case 0x03: /* UTF-8 */
  921. while (i < (4 + page_83[3]))
  922. vpd->device_identifier[j++] = page_83[i++];
  923. break;
  924. default:
  925. break;
  926. }
  927. return transport_dump_vpd_ident(vpd, NULL, 0);
  928. }
  929. EXPORT_SYMBOL(transport_set_vpd_ident);
  930. sense_reason_t
  931. target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
  932. {
  933. struct se_device *dev = cmd->se_dev;
  934. if (cmd->unknown_data_length) {
  935. cmd->data_length = size;
  936. } else if (size != cmd->data_length) {
  937. pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
  938. " %u does not match SCSI CDB Length: %u for SAM Opcode:"
  939. " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
  940. cmd->data_length, size, cmd->t_task_cdb[0]);
  941. if (cmd->data_direction == DMA_TO_DEVICE) {
  942. pr_err("Rejecting underflow/overflow"
  943. " WRITE data\n");
  944. return TCM_INVALID_CDB_FIELD;
  945. }
  946. /*
  947. * Reject READ_* or WRITE_* with overflow/underflow for
  948. * type SCF_SCSI_DATA_CDB.
  949. */
  950. if (dev->dev_attrib.block_size != 512) {
  951. pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
  952. " CDB on non 512-byte sector setup subsystem"
  953. " plugin: %s\n", dev->transport->name);
  954. /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
  955. return TCM_INVALID_CDB_FIELD;
  956. }
  957. /*
  958. * For the overflow case keep the existing fabric provided
  959. * ->data_length. Otherwise for the underflow case, reset
  960. * ->data_length to the smaller SCSI expected data transfer
  961. * length.
  962. */
  963. if (size > cmd->data_length) {
  964. cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
  965. cmd->residual_count = (size - cmd->data_length);
  966. } else {
  967. cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
  968. cmd->residual_count = (cmd->data_length - size);
  969. cmd->data_length = size;
  970. }
  971. }
  972. return 0;
  973. }
  974. /*
  975. * Used by fabric modules containing a local struct se_cmd within their
  976. * fabric dependent per I/O descriptor.
  977. */
  978. void transport_init_se_cmd(
  979. struct se_cmd *cmd,
  980. struct target_core_fabric_ops *tfo,
  981. struct se_session *se_sess,
  982. u32 data_length,
  983. int data_direction,
  984. int task_attr,
  985. unsigned char *sense_buffer)
  986. {
  987. INIT_LIST_HEAD(&cmd->se_delayed_node);
  988. INIT_LIST_HEAD(&cmd->se_qf_node);
  989. INIT_LIST_HEAD(&cmd->se_cmd_list);
  990. INIT_LIST_HEAD(&cmd->state_list);
  991. init_completion(&cmd->t_transport_stop_comp);
  992. init_completion(&cmd->cmd_wait_comp);
  993. init_completion(&cmd->task_stop_comp);
  994. spin_lock_init(&cmd->t_state_lock);
  995. kref_init(&cmd->cmd_kref);
  996. cmd->transport_state = CMD_T_DEV_ACTIVE;
  997. cmd->se_tfo = tfo;
  998. cmd->se_sess = se_sess;
  999. cmd->data_length = data_length;
  1000. cmd->data_direction = data_direction;
  1001. cmd->sam_task_attr = task_attr;
  1002. cmd->sense_buffer = sense_buffer;
  1003. cmd->state_active = false;
  1004. }
  1005. EXPORT_SYMBOL(transport_init_se_cmd);
  1006. static sense_reason_t
  1007. transport_check_alloc_task_attr(struct se_cmd *cmd)
  1008. {
  1009. struct se_device *dev = cmd->se_dev;
  1010. /*
  1011. * Check if SAM Task Attribute emulation is enabled for this
  1012. * struct se_device storage object
  1013. */
  1014. if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
  1015. return 0;
  1016. if (cmd->sam_task_attr == TCM_ACA_TAG) {
  1017. pr_debug("SAM Task Attribute ACA"
  1018. " emulation is not supported\n");
  1019. return TCM_INVALID_CDB_FIELD;
  1020. }
  1021. /*
  1022. * Used to determine when ORDERED commands should go from
  1023. * Dormant to Active status.
  1024. */
  1025. cmd->se_ordered_id = atomic_inc_return(&dev->dev_ordered_id);
  1026. pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
  1027. cmd->se_ordered_id, cmd->sam_task_attr,
  1028. dev->transport->name);
  1029. return 0;
  1030. }
  1031. sense_reason_t
  1032. target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb)
  1033. {
  1034. struct se_device *dev = cmd->se_dev;
  1035. sense_reason_t ret;
  1036. /*
  1037. * Ensure that the received CDB is less than the max (252 + 8) bytes
  1038. * for VARIABLE_LENGTH_CMD
  1039. */
  1040. if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
  1041. pr_err("Received SCSI CDB with command_size: %d that"
  1042. " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
  1043. scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
  1044. return TCM_INVALID_CDB_FIELD;
  1045. }
  1046. /*
  1047. * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
  1048. * allocate the additional extended CDB buffer now.. Otherwise
  1049. * setup the pointer from __t_task_cdb to t_task_cdb.
  1050. */
  1051. if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
  1052. cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
  1053. GFP_KERNEL);
  1054. if (!cmd->t_task_cdb) {
  1055. pr_err("Unable to allocate cmd->t_task_cdb"
  1056. " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
  1057. scsi_command_size(cdb),
  1058. (unsigned long)sizeof(cmd->__t_task_cdb));
  1059. return TCM_OUT_OF_RESOURCES;
  1060. }
  1061. } else
  1062. cmd->t_task_cdb = &cmd->__t_task_cdb[0];
  1063. /*
  1064. * Copy the original CDB into cmd->
  1065. */
  1066. memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
  1067. trace_target_sequencer_start(cmd);
  1068. /*
  1069. * Check for an existing UNIT ATTENTION condition
  1070. */
  1071. ret = target_scsi3_ua_check(cmd);
  1072. if (ret)
  1073. return ret;
  1074. ret = target_alua_state_check(cmd);
  1075. if (ret)
  1076. return ret;
  1077. ret = target_check_reservation(cmd);
  1078. if (ret) {
  1079. cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
  1080. return ret;
  1081. }
  1082. ret = dev->transport->parse_cdb(cmd);
  1083. if (ret)
  1084. return ret;
  1085. ret = transport_check_alloc_task_attr(cmd);
  1086. if (ret)
  1087. return ret;
  1088. cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
  1089. spin_lock(&cmd->se_lun->lun_sep_lock);
  1090. if (cmd->se_lun->lun_sep)
  1091. cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
  1092. spin_unlock(&cmd->se_lun->lun_sep_lock);
  1093. return 0;
  1094. }
  1095. EXPORT_SYMBOL(target_setup_cmd_from_cdb);
  1096. /*
  1097. * Used by fabric module frontends to queue tasks directly.
  1098. * Many only be used from process context only
  1099. */
  1100. int transport_handle_cdb_direct(
  1101. struct se_cmd *cmd)
  1102. {
  1103. sense_reason_t ret;
  1104. if (!cmd->se_lun) {
  1105. dump_stack();
  1106. pr_err("cmd->se_lun is NULL\n");
  1107. return -EINVAL;
  1108. }
  1109. if (in_interrupt()) {
  1110. dump_stack();
  1111. pr_err("transport_generic_handle_cdb cannot be called"
  1112. " from interrupt context\n");
  1113. return -EINVAL;
  1114. }
  1115. /*
  1116. * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
  1117. * outstanding descriptors are handled correctly during shutdown via
  1118. * transport_wait_for_tasks()
  1119. *
  1120. * Also, we don't take cmd->t_state_lock here as we only expect
  1121. * this to be called for initial descriptor submission.
  1122. */
  1123. cmd->t_state = TRANSPORT_NEW_CMD;
  1124. cmd->transport_state |= CMD_T_ACTIVE;
  1125. /*
  1126. * transport_generic_new_cmd() is already handling QUEUE_FULL,
  1127. * so follow TRANSPORT_NEW_CMD processing thread context usage
  1128. * and call transport_generic_request_failure() if necessary..
  1129. */
  1130. ret = transport_generic_new_cmd(cmd);
  1131. if (ret)
  1132. transport_generic_request_failure(cmd, ret);
  1133. return 0;
  1134. }
  1135. EXPORT_SYMBOL(transport_handle_cdb_direct);
  1136. sense_reason_t
  1137. transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl,
  1138. u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
  1139. {
  1140. if (!sgl || !sgl_count)
  1141. return 0;
  1142. /*
  1143. * Reject SCSI data overflow with map_mem_to_cmd() as incoming
  1144. * scatterlists already have been set to follow what the fabric
  1145. * passes for the original expected data transfer length.
  1146. */
  1147. if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
  1148. pr_warn("Rejecting SCSI DATA overflow for fabric using"
  1149. " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
  1150. return TCM_INVALID_CDB_FIELD;
  1151. }
  1152. cmd->t_data_sg = sgl;
  1153. cmd->t_data_nents = sgl_count;
  1154. if (sgl_bidi && sgl_bidi_count) {
  1155. cmd->t_bidi_data_sg = sgl_bidi;
  1156. cmd->t_bidi_data_nents = sgl_bidi_count;
  1157. }
  1158. cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
  1159. return 0;
  1160. }
  1161. /*
  1162. * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
  1163. * se_cmd + use pre-allocated SGL memory.
  1164. *
  1165. * @se_cmd: command descriptor to submit
  1166. * @se_sess: associated se_sess for endpoint
  1167. * @cdb: pointer to SCSI CDB
  1168. * @sense: pointer to SCSI sense buffer
  1169. * @unpacked_lun: unpacked LUN to reference for struct se_lun
  1170. * @data_length: fabric expected data transfer length
  1171. * @task_addr: SAM task attribute
  1172. * @data_dir: DMA data direction
  1173. * @flags: flags for command submission from target_sc_flags_tables
  1174. * @sgl: struct scatterlist memory for unidirectional mapping
  1175. * @sgl_count: scatterlist count for unidirectional mapping
  1176. * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
  1177. * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
  1178. * @sgl_prot: struct scatterlist memory protection information
  1179. * @sgl_prot_count: scatterlist count for protection information
  1180. *
  1181. * Returns non zero to signal active I/O shutdown failure. All other
  1182. * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
  1183. * but still return zero here.
  1184. *
  1185. * This may only be called from process context, and also currently
  1186. * assumes internal allocation of fabric payload buffer by target-core.
  1187. */
  1188. int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess,
  1189. unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
  1190. u32 data_length, int task_attr, int data_dir, int flags,
  1191. struct scatterlist *sgl, u32 sgl_count,
  1192. struct scatterlist *sgl_bidi, u32 sgl_bidi_count,
  1193. struct scatterlist *sgl_prot, u32 sgl_prot_count)
  1194. {
  1195. struct se_portal_group *se_tpg;
  1196. sense_reason_t rc;
  1197. int ret;
  1198. se_tpg = se_sess->se_tpg;
  1199. BUG_ON(!se_tpg);
  1200. BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
  1201. BUG_ON(in_interrupt());
  1202. /*
  1203. * Initialize se_cmd for target operation. From this point
  1204. * exceptions are handled by sending exception status via
  1205. * target_core_fabric_ops->queue_status() callback
  1206. */
  1207. transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
  1208. data_length, data_dir, task_attr, sense);
  1209. if (flags & TARGET_SCF_UNKNOWN_SIZE)
  1210. se_cmd->unknown_data_length = 1;
  1211. /*
  1212. * Obtain struct se_cmd->cmd_kref reference and add new cmd to
  1213. * se_sess->sess_cmd_list. A second kref_get here is necessary
  1214. * for fabrics using TARGET_SCF_ACK_KREF that expect a second
  1215. * kref_put() to happen during fabric packet acknowledgement.
  1216. */
  1217. ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
  1218. if (ret)
  1219. return ret;
  1220. /*
  1221. * Signal bidirectional data payloads to target-core
  1222. */
  1223. if (flags & TARGET_SCF_BIDI_OP)
  1224. se_cmd->se_cmd_flags |= SCF_BIDI;
  1225. /*
  1226. * Locate se_lun pointer and attach it to struct se_cmd
  1227. */
  1228. rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun);
  1229. if (rc) {
  1230. transport_send_check_condition_and_sense(se_cmd, rc, 0);
  1231. target_put_sess_cmd(se_sess, se_cmd);
  1232. return 0;
  1233. }
  1234. rc = target_setup_cmd_from_cdb(se_cmd, cdb);
  1235. if (rc != 0) {
  1236. transport_generic_request_failure(se_cmd, rc);
  1237. return 0;
  1238. }
  1239. /*
  1240. * Save pointers for SGLs containing protection information,
  1241. * if present.
  1242. */
  1243. if (sgl_prot_count) {
  1244. se_cmd->t_prot_sg = sgl_prot;
  1245. se_cmd->t_prot_nents = sgl_prot_count;
  1246. }
  1247. /*
  1248. * When a non zero sgl_count has been passed perform SGL passthrough
  1249. * mapping for pre-allocated fabric memory instead of having target
  1250. * core perform an internal SGL allocation..
  1251. */
  1252. if (sgl_count != 0) {
  1253. BUG_ON(!sgl);
  1254. /*
  1255. * A work-around for tcm_loop as some userspace code via
  1256. * scsi-generic do not memset their associated read buffers,
  1257. * so go ahead and do that here for type non-data CDBs. Also
  1258. * note that this is currently guaranteed to be a single SGL
  1259. * for this case by target core in target_setup_cmd_from_cdb()
  1260. * -> transport_generic_cmd_sequencer().
  1261. */
  1262. if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
  1263. se_cmd->data_direction == DMA_FROM_DEVICE) {
  1264. unsigned char *buf = NULL;
  1265. if (sgl)
  1266. buf = kmap(sg_page(sgl)) + sgl->offset;
  1267. if (buf) {
  1268. memset(buf, 0, sgl->length);
  1269. kunmap(sg_page(sgl));
  1270. }
  1271. }
  1272. rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count,
  1273. sgl_bidi, sgl_bidi_count);
  1274. if (rc != 0) {
  1275. transport_generic_request_failure(se_cmd, rc);
  1276. return 0;
  1277. }
  1278. }
  1279. /*
  1280. * Check if we need to delay processing because of ALUA
  1281. * Active/NonOptimized primary access state..
  1282. */
  1283. core_alua_check_nonop_delay(se_cmd);
  1284. transport_handle_cdb_direct(se_cmd);
  1285. return 0;
  1286. }
  1287. EXPORT_SYMBOL(target_submit_cmd_map_sgls);
  1288. /*
  1289. * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
  1290. *
  1291. * @se_cmd: command descriptor to submit
  1292. * @se_sess: associated se_sess for endpoint
  1293. * @cdb: pointer to SCSI CDB
  1294. * @sense: pointer to SCSI sense buffer
  1295. * @unpacked_lun: unpacked LUN to reference for struct se_lun
  1296. * @data_length: fabric expected data transfer length
  1297. * @task_addr: SAM task attribute
  1298. * @data_dir: DMA data direction
  1299. * @flags: flags for command submission from target_sc_flags_tables
  1300. *
  1301. * Returns non zero to signal active I/O shutdown failure. All other
  1302. * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
  1303. * but still return zero here.
  1304. *
  1305. * This may only be called from process context, and also currently
  1306. * assumes internal allocation of fabric payload buffer by target-core.
  1307. *
  1308. * It also assumes interal target core SGL memory allocation.
  1309. */
  1310. int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
  1311. unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
  1312. u32 data_length, int task_attr, int data_dir, int flags)
  1313. {
  1314. return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense,
  1315. unpacked_lun, data_length, task_attr, data_dir,
  1316. flags, NULL, 0, NULL, 0, NULL, 0);
  1317. }
  1318. EXPORT_SYMBOL(target_submit_cmd);
  1319. static void target_complete_tmr_failure(struct work_struct *work)
  1320. {
  1321. struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
  1322. se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
  1323. se_cmd->se_tfo->queue_tm_rsp(se_cmd);
  1324. transport_cmd_check_stop_to_fabric(se_cmd);
  1325. }
  1326. /**
  1327. * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
  1328. * for TMR CDBs
  1329. *
  1330. * @se_cmd: command descriptor to submit
  1331. * @se_sess: associated se_sess for endpoint
  1332. * @sense: pointer to SCSI sense buffer
  1333. * @unpacked_lun: unpacked LUN to reference for struct se_lun
  1334. * @fabric_context: fabric context for TMR req
  1335. * @tm_type: Type of TM request
  1336. * @gfp: gfp type for caller
  1337. * @tag: referenced task tag for TMR_ABORT_TASK
  1338. * @flags: submit cmd flags
  1339. *
  1340. * Callable from all contexts.
  1341. **/
  1342. int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
  1343. unsigned char *sense, u32 unpacked_lun,
  1344. void *fabric_tmr_ptr, unsigned char tm_type,
  1345. gfp_t gfp, unsigned int tag, int flags)
  1346. {
  1347. struct se_portal_group *se_tpg;
  1348. int ret;
  1349. se_tpg = se_sess->se_tpg;
  1350. BUG_ON(!se_tpg);
  1351. transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
  1352. 0, DMA_NONE, TCM_SIMPLE_TAG, sense);
  1353. /*
  1354. * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
  1355. * allocation failure.
  1356. */
  1357. ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
  1358. if (ret < 0)
  1359. return -ENOMEM;
  1360. if (tm_type == TMR_ABORT_TASK)
  1361. se_cmd->se_tmr_req->ref_task_tag = tag;
  1362. /* See target_submit_cmd for commentary */
  1363. ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
  1364. if (ret) {
  1365. core_tmr_release_req(se_cmd->se_tmr_req);
  1366. return ret;
  1367. }
  1368. ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
  1369. if (ret) {
  1370. /*
  1371. * For callback during failure handling, push this work off
  1372. * to process context with TMR_LUN_DOES_NOT_EXIST status.
  1373. */
  1374. INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
  1375. schedule_work(&se_cmd->work);
  1376. return 0;
  1377. }
  1378. transport_generic_handle_tmr(se_cmd);
  1379. return 0;
  1380. }
  1381. EXPORT_SYMBOL(target_submit_tmr);
  1382. /*
  1383. * If the cmd is active, request it to be stopped and sleep until it
  1384. * has completed.
  1385. */
  1386. bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
  1387. {
  1388. bool was_active = false;
  1389. if (cmd->transport_state & CMD_T_BUSY) {
  1390. cmd->transport_state |= CMD_T_REQUEST_STOP;
  1391. spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
  1392. pr_debug("cmd %p waiting to complete\n", cmd);
  1393. wait_for_completion(&cmd->task_stop_comp);
  1394. pr_debug("cmd %p stopped successfully\n", cmd);
  1395. spin_lock_irqsave(&cmd->t_state_lock, *flags);
  1396. cmd->transport_state &= ~CMD_T_REQUEST_STOP;
  1397. cmd->transport_state &= ~CMD_T_BUSY;
  1398. was_active = true;
  1399. }
  1400. return was_active;
  1401. }
  1402. /*
  1403. * Handle SAM-esque emulation for generic transport request failures.
  1404. */
  1405. void transport_generic_request_failure(struct se_cmd *cmd,
  1406. sense_reason_t sense_reason)
  1407. {
  1408. int ret = 0;
  1409. pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
  1410. " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
  1411. cmd->t_task_cdb[0]);
  1412. pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n",
  1413. cmd->se_tfo->get_cmd_state(cmd),
  1414. cmd->t_state, sense_reason);
  1415. pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
  1416. (cmd->transport_state & CMD_T_ACTIVE) != 0,
  1417. (cmd->transport_state & CMD_T_STOP) != 0,
  1418. (cmd->transport_state & CMD_T_SENT) != 0);
  1419. /*
  1420. * For SAM Task Attribute emulation for failed struct se_cmd
  1421. */
  1422. transport_complete_task_attr(cmd);
  1423. /*
  1424. * Handle special case for COMPARE_AND_WRITE failure, where the
  1425. * callback is expected to drop the per device ->caw_mutex.
  1426. */
  1427. if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
  1428. cmd->transport_complete_callback)
  1429. cmd->transport_complete_callback(cmd);
  1430. switch (sense_reason) {
  1431. case TCM_NON_EXISTENT_LUN:
  1432. case TCM_UNSUPPORTED_SCSI_OPCODE:
  1433. case TCM_INVALID_CDB_FIELD:
  1434. case TCM_INVALID_PARAMETER_LIST:
  1435. case TCM_PARAMETER_LIST_LENGTH_ERROR:
  1436. case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
  1437. case TCM_UNKNOWN_MODE_PAGE:
  1438. case TCM_WRITE_PROTECTED:
  1439. case TCM_ADDRESS_OUT_OF_RANGE:
  1440. case TCM_CHECK_CONDITION_ABORT_CMD:
  1441. case TCM_CHECK_CONDITION_UNIT_ATTENTION:
  1442. case TCM_CHECK_CONDITION_NOT_READY:
  1443. case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED:
  1444. case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED:
  1445. case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED:
  1446. break;
  1447. case TCM_OUT_OF_RESOURCES:
  1448. sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
  1449. break;
  1450. case TCM_RESERVATION_CONFLICT:
  1451. /*
  1452. * No SENSE Data payload for this case, set SCSI Status
  1453. * and queue the response to $FABRIC_MOD.
  1454. *
  1455. * Uses linux/include/scsi/scsi.h SAM status codes defs
  1456. */
  1457. cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
  1458. /*
  1459. * For UA Interlock Code 11b, a RESERVATION CONFLICT will
  1460. * establish a UNIT ATTENTION with PREVIOUS RESERVATION
  1461. * CONFLICT STATUS.
  1462. *
  1463. * See spc4r17, section 7.4.6 Control Mode Page, Table 349
  1464. */
  1465. if (cmd->se_sess &&
  1466. cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2)
  1467. core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
  1468. cmd->orig_fe_lun, 0x2C,
  1469. ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
  1470. trace_target_cmd_complete(cmd);
  1471. ret = cmd->se_tfo-> queue_status(cmd);
  1472. if (ret == -EAGAIN || ret == -ENOMEM)
  1473. goto queue_full;
  1474. goto check_stop;
  1475. default:
  1476. pr_err("Unknown transport error for CDB 0x%02x: %d\n",
  1477. cmd->t_task_cdb[0], sense_reason);
  1478. sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
  1479. break;
  1480. }
  1481. ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0);
  1482. if (ret == -EAGAIN || ret == -ENOMEM)
  1483. goto queue_full;
  1484. check_stop:
  1485. transport_lun_remove_cmd(cmd);
  1486. if (!transport_cmd_check_stop_to_fabric(cmd))
  1487. ;
  1488. return;
  1489. queue_full:
  1490. cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
  1491. transport_handle_queue_full(cmd, cmd->se_dev);
  1492. }
  1493. EXPORT_SYMBOL(transport_generic_request_failure);
  1494. void __target_execute_cmd(struct se_cmd *cmd)
  1495. {
  1496. sense_reason_t ret;
  1497. if (cmd->execute_cmd) {
  1498. ret = cmd->execute_cmd(cmd);
  1499. if (ret) {
  1500. spin_lock_irq(&cmd->t_state_lock);
  1501. cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
  1502. spin_unlock_irq(&cmd->t_state_lock);
  1503. transport_generic_request_failure(cmd, ret);
  1504. }
  1505. }
  1506. }
  1507. static bool target_handle_task_attr(struct se_cmd *cmd)
  1508. {
  1509. struct se_device *dev = cmd->se_dev;
  1510. if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
  1511. return false;
  1512. /*
  1513. * Check for the existence of HEAD_OF_QUEUE, and if true return 1
  1514. * to allow the passed struct se_cmd list of tasks to the front of the list.
  1515. */
  1516. switch (cmd->sam_task_attr) {
  1517. case TCM_HEAD_TAG:
  1518. pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
  1519. "se_ordered_id: %u\n",
  1520. cmd->t_task_cdb[0], cmd->se_ordered_id);
  1521. return false;
  1522. case TCM_ORDERED_TAG:
  1523. atomic_inc_mb(&dev->dev_ordered_sync);
  1524. pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
  1525. " se_ordered_id: %u\n",
  1526. cmd->t_task_cdb[0], cmd->se_ordered_id);
  1527. /*
  1528. * Execute an ORDERED command if no other older commands
  1529. * exist that need to be completed first.
  1530. */
  1531. if (!atomic_read(&dev->simple_cmds))
  1532. return false;
  1533. break;
  1534. default:
  1535. /*
  1536. * For SIMPLE and UNTAGGED Task Attribute commands
  1537. */
  1538. atomic_inc_mb(&dev->simple_cmds);
  1539. break;
  1540. }
  1541. if (atomic_read(&dev->dev_ordered_sync) == 0)
  1542. return false;
  1543. spin_lock(&dev->delayed_cmd_lock);
  1544. list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
  1545. spin_unlock(&dev->delayed_cmd_lock);
  1546. pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
  1547. " delayed CMD list, se_ordered_id: %u\n",
  1548. cmd->t_task_cdb[0], cmd->sam_task_attr,
  1549. cmd->se_ordered_id);
  1550. return true;
  1551. }
  1552. void target_execute_cmd(struct se_cmd *cmd)
  1553. {
  1554. /*
  1555. * If the received CDB has aleady been aborted stop processing it here.
  1556. */
  1557. if (transport_check_aborted_status(cmd, 1))
  1558. return;
  1559. /*
  1560. * Determine if frontend context caller is requesting the stopping of
  1561. * this command for frontend exceptions.
  1562. */
  1563. spin_lock_irq(&cmd->t_state_lock);
  1564. if (cmd->transport_state & CMD_T_STOP) {
  1565. pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
  1566. __func__, __LINE__,
  1567. cmd->se_tfo->get_task_tag(cmd));
  1568. spin_unlock_irq(&cmd->t_state_lock);
  1569. complete_all(&cmd->t_transport_stop_comp);
  1570. return;
  1571. }
  1572. cmd->t_state = TRANSPORT_PROCESSING;
  1573. cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT;
  1574. spin_unlock_irq(&cmd->t_state_lock);
  1575. /*
  1576. * Perform WRITE_INSERT of PI using software emulation when backend
  1577. * device has PI enabled, if the transport has not already generated
  1578. * PI using hardware WRITE_INSERT offload.
  1579. */
  1580. if (cmd->prot_op == TARGET_PROT_DOUT_INSERT) {
  1581. if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_INSERT))
  1582. sbc_dif_generate(cmd);
  1583. }
  1584. if (target_handle_task_attr(cmd)) {
  1585. spin_lock_irq(&cmd->t_state_lock);
  1586. cmd->transport_state &= ~CMD_T_BUSY|CMD_T_SENT;
  1587. spin_unlock_irq(&cmd->t_state_lock);
  1588. return;
  1589. }
  1590. __target_execute_cmd(cmd);
  1591. }
  1592. EXPORT_SYMBOL(target_execute_cmd);
  1593. /*
  1594. * Process all commands up to the last received ORDERED task attribute which
  1595. * requires another blocking boundary
  1596. */
  1597. static void target_restart_delayed_cmds(struct se_device *dev)
  1598. {
  1599. for (;;) {
  1600. struct se_cmd *cmd;
  1601. spin_lock(&dev->delayed_cmd_lock);
  1602. if (list_empty(&dev->delayed_cmd_list)) {
  1603. spin_unlock(&dev->delayed_cmd_lock);
  1604. break;
  1605. }
  1606. cmd = list_entry(dev->delayed_cmd_list.next,
  1607. struct se_cmd, se_delayed_node);
  1608. list_del(&cmd->se_delayed_node);
  1609. spin_unlock(&dev->delayed_cmd_lock);
  1610. __target_execute_cmd(cmd);
  1611. if (cmd->sam_task_attr == TCM_ORDERED_TAG)
  1612. break;
  1613. }
  1614. }
  1615. /*
  1616. * Called from I/O completion to determine which dormant/delayed
  1617. * and ordered cmds need to have their tasks added to the execution queue.
  1618. */
  1619. static void transport_complete_task_attr(struct se_cmd *cmd)
  1620. {
  1621. struct se_device *dev = cmd->se_dev;
  1622. if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
  1623. return;
  1624. if (cmd->sam_task_attr == TCM_SIMPLE_TAG) {
  1625. atomic_dec_mb(&dev->simple_cmds);
  1626. dev->dev_cur_ordered_id++;
  1627. pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
  1628. " SIMPLE: %u\n", dev->dev_cur_ordered_id,
  1629. cmd->se_ordered_id);
  1630. } else if (cmd->sam_task_attr == TCM_HEAD_TAG) {
  1631. dev->dev_cur_ordered_id++;
  1632. pr_debug("Incremented dev_cur_ordered_id: %u for"
  1633. " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
  1634. cmd->se_ordered_id);
  1635. } else if (cmd->sam_task_attr == TCM_ORDERED_TAG) {
  1636. atomic_dec_mb(&dev->dev_ordered_sync);
  1637. dev->dev_cur_ordered_id++;
  1638. pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
  1639. " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
  1640. }
  1641. target_restart_delayed_cmds(dev);
  1642. }
  1643. static void transport_complete_qf(struct se_cmd *cmd)
  1644. {
  1645. int ret = 0;
  1646. transport_complete_task_attr(cmd);
  1647. if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
  1648. trace_target_cmd_complete(cmd);
  1649. ret = cmd->se_tfo->queue_status(cmd);
  1650. goto out;
  1651. }
  1652. switch (cmd->data_direction) {
  1653. case DMA_FROM_DEVICE:
  1654. trace_target_cmd_complete(cmd);
  1655. ret = cmd->se_tfo->queue_data_in(cmd);
  1656. break;
  1657. case DMA_TO_DEVICE:
  1658. if (cmd->se_cmd_flags & SCF_BIDI) {
  1659. ret = cmd->se_tfo->queue_data_in(cmd);
  1660. if (ret < 0)
  1661. break;
  1662. }
  1663. /* Fall through for DMA_TO_DEVICE */
  1664. case DMA_NONE:
  1665. trace_target_cmd_complete(cmd);
  1666. ret = cmd->se_tfo->queue_status(cmd);
  1667. break;
  1668. default:
  1669. break;
  1670. }
  1671. out:
  1672. if (ret < 0) {
  1673. transport_handle_queue_full(cmd, cmd->se_dev);
  1674. return;
  1675. }
  1676. transport_lun_remove_cmd(cmd);
  1677. transport_cmd_check_stop_to_fabric(cmd);
  1678. }
  1679. static void transport_handle_queue_full(
  1680. struct se_cmd *cmd,
  1681. struct se_device *dev)
  1682. {
  1683. spin_lock_irq(&dev->qf_cmd_lock);
  1684. list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
  1685. atomic_inc_mb(&dev->dev_qf_count);
  1686. spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
  1687. schedule_work(&cmd->se_dev->qf_work_queue);
  1688. }
  1689. static bool target_check_read_strip(struct se_cmd *cmd)
  1690. {
  1691. sense_reason_t rc;
  1692. if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_STRIP)) {
  1693. rc = sbc_dif_read_strip(cmd);
  1694. if (rc) {
  1695. cmd->pi_err = rc;
  1696. return true;
  1697. }
  1698. }
  1699. return false;
  1700. }
  1701. static void target_complete_ok_work(struct work_struct *work)
  1702. {
  1703. struct se_cmd *cmd = container_of(work, struct se_cmd, work);
  1704. int ret;
  1705. /*
  1706. * Check if we need to move delayed/dormant tasks from cmds on the
  1707. * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
  1708. * Attribute.
  1709. */
  1710. transport_complete_task_attr(cmd);
  1711. /*
  1712. * Check to schedule QUEUE_FULL work, or execute an existing
  1713. * cmd->transport_qf_callback()
  1714. */
  1715. if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
  1716. schedule_work(&cmd->se_dev->qf_work_queue);
  1717. /*
  1718. * Check if we need to send a sense buffer from
  1719. * the struct se_cmd in question.
  1720. */
  1721. if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
  1722. WARN_ON(!cmd->scsi_status);
  1723. ret = transport_send_check_condition_and_sense(
  1724. cmd, 0, 1);
  1725. if (ret == -EAGAIN || ret == -ENOMEM)
  1726. goto queue_full;
  1727. transport_lun_remove_cmd(cmd);
  1728. transport_cmd_check_stop_to_fabric(cmd);
  1729. return;
  1730. }
  1731. /*
  1732. * Check for a callback, used by amongst other things
  1733. * XDWRITE_READ_10 and COMPARE_AND_WRITE emulation.
  1734. */
  1735. if (cmd->transport_complete_callback) {
  1736. sense_reason_t rc;
  1737. rc = cmd->transport_complete_callback(cmd);
  1738. if (!rc && !(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE_POST)) {
  1739. return;
  1740. } else if (rc) {
  1741. ret = transport_send_check_condition_and_sense(cmd,
  1742. rc, 0);
  1743. if (ret == -EAGAIN || ret == -ENOMEM)
  1744. goto queue_full;
  1745. transport_lun_remove_cmd(cmd);
  1746. transport_cmd_check_stop_to_fabric(cmd);
  1747. return;
  1748. }
  1749. }
  1750. switch (cmd->data_direction) {
  1751. case DMA_FROM_DEVICE:
  1752. spin_lock(&cmd->se_lun->lun_sep_lock);
  1753. if (cmd->se_lun->lun_sep) {
  1754. cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
  1755. cmd->data_length;
  1756. }
  1757. spin_unlock(&cmd->se_lun->lun_sep_lock);
  1758. /*
  1759. * Perform READ_STRIP of PI using software emulation when
  1760. * backend had PI enabled, if the transport will not be
  1761. * performing hardware READ_STRIP offload.
  1762. */
  1763. if (cmd->prot_op == TARGET_PROT_DIN_STRIP &&
  1764. target_check_read_strip(cmd)) {
  1765. ret = transport_send_check_condition_and_sense(cmd,
  1766. cmd->pi_err, 0);
  1767. if (ret == -EAGAIN || ret == -ENOMEM)
  1768. goto queue_full;
  1769. transport_lun_remove_cmd(cmd);
  1770. transport_cmd_check_stop_to_fabric(cmd);
  1771. return;
  1772. }
  1773. trace_target_cmd_complete(cmd);
  1774. ret = cmd->se_tfo->queue_data_in(cmd);
  1775. if (ret == -EAGAIN || ret == -ENOMEM)
  1776. goto queue_full;
  1777. break;
  1778. case DMA_TO_DEVICE:
  1779. spin_lock(&cmd->se_lun->lun_sep_lock);
  1780. if (cmd->se_lun->lun_sep) {
  1781. cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
  1782. cmd->data_length;
  1783. }
  1784. spin_unlock(&cmd->se_lun->lun_sep_lock);
  1785. /*
  1786. * Check if we need to send READ payload for BIDI-COMMAND
  1787. */
  1788. if (cmd->se_cmd_flags & SCF_BIDI) {
  1789. spin_lock(&cmd->se_lun->lun_sep_lock);
  1790. if (cmd->se_lun->lun_sep) {
  1791. cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
  1792. cmd->data_length;
  1793. }
  1794. spin_unlock(&cmd->se_lun->lun_sep_lock);
  1795. ret = cmd->se_tfo->queue_data_in(cmd);
  1796. if (ret == -EAGAIN || ret == -ENOMEM)
  1797. goto queue_full;
  1798. break;
  1799. }
  1800. /* Fall through for DMA_TO_DEVICE */
  1801. case DMA_NONE:
  1802. trace_target_cmd_complete(cmd);
  1803. ret = cmd->se_tfo->queue_status(cmd);
  1804. if (ret == -EAGAIN || ret == -ENOMEM)
  1805. goto queue_full;
  1806. break;
  1807. default:
  1808. break;
  1809. }
  1810. transport_lun_remove_cmd(cmd);
  1811. transport_cmd_check_stop_to_fabric(cmd);
  1812. return;
  1813. queue_full:
  1814. pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
  1815. " data_direction: %d\n", cmd, cmd->data_direction);
  1816. cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
  1817. transport_handle_queue_full(cmd, cmd->se_dev);
  1818. }
  1819. static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
  1820. {
  1821. struct scatterlist *sg;
  1822. int count;
  1823. for_each_sg(sgl, sg, nents, count)
  1824. __free_page(sg_page(sg));
  1825. kfree(sgl);
  1826. }
  1827. static inline void transport_reset_sgl_orig(struct se_cmd *cmd)
  1828. {
  1829. /*
  1830. * Check for saved t_data_sg that may be used for COMPARE_AND_WRITE
  1831. * emulation, and free + reset pointers if necessary..
  1832. */
  1833. if (!cmd->t_data_sg_orig)
  1834. return;
  1835. kfree(cmd->t_data_sg);
  1836. cmd->t_data_sg = cmd->t_data_sg_orig;
  1837. cmd->t_data_sg_orig = NULL;
  1838. cmd->t_data_nents = cmd->t_data_nents_orig;
  1839. cmd->t_data_nents_orig = 0;
  1840. }
  1841. static inline void transport_free_pages(struct se_cmd *cmd)
  1842. {
  1843. if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) {
  1844. transport_reset_sgl_orig(cmd);
  1845. return;
  1846. }
  1847. transport_reset_sgl_orig(cmd);
  1848. transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
  1849. cmd->t_data_sg = NULL;
  1850. cmd->t_data_nents = 0;
  1851. transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
  1852. cmd->t_bidi_data_sg = NULL;
  1853. cmd->t_bidi_data_nents = 0;
  1854. transport_free_sgl(cmd->t_prot_sg, cmd->t_prot_nents);
  1855. cmd->t_prot_sg = NULL;
  1856. cmd->t_prot_nents = 0;
  1857. }
  1858. /**
  1859. * transport_release_cmd - free a command
  1860. * @cmd: command to free
  1861. *
  1862. * This routine unconditionally frees a command, and reference counting
  1863. * or list removal must be done in the caller.
  1864. */
  1865. static int transport_release_cmd(struct se_cmd *cmd)
  1866. {
  1867. BUG_ON(!cmd->se_tfo);
  1868. if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
  1869. core_tmr_release_req(cmd->se_tmr_req);
  1870. if (cmd->t_task_cdb != cmd->__t_task_cdb)
  1871. kfree(cmd->t_task_cdb);
  1872. /*
  1873. * If this cmd has been setup with target_get_sess_cmd(), drop
  1874. * the kref and call ->release_cmd() in kref callback.
  1875. */
  1876. return target_put_sess_cmd(cmd->se_sess, cmd);
  1877. }
  1878. /**
  1879. * transport_put_cmd - release a reference to a command
  1880. * @cmd: command to release
  1881. *
  1882. * This routine releases our reference to the command and frees it if possible.
  1883. */
  1884. static int transport_put_cmd(struct se_cmd *cmd)
  1885. {
  1886. transport_free_pages(cmd);
  1887. return transport_release_cmd(cmd);
  1888. }
  1889. void *transport_kmap_data_sg(struct se_cmd *cmd)
  1890. {
  1891. struct scatterlist *sg = cmd->t_data_sg;
  1892. struct page **pages;
  1893. int i;
  1894. /*
  1895. * We need to take into account a possible offset here for fabrics like
  1896. * tcm_loop who may be using a contig buffer from the SCSI midlayer for
  1897. * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
  1898. */
  1899. if (!cmd->t_data_nents)
  1900. return NULL;
  1901. BUG_ON(!sg);
  1902. if (cmd->t_data_nents == 1)
  1903. return kmap(sg_page(sg)) + sg->offset;
  1904. /* >1 page. use vmap */
  1905. pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
  1906. if (!pages)
  1907. return NULL;
  1908. /* convert sg[] to pages[] */
  1909. for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
  1910. pages[i] = sg_page(sg);
  1911. }
  1912. cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
  1913. kfree(pages);
  1914. if (!cmd->t_data_vmap)
  1915. return NULL;
  1916. return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
  1917. }
  1918. EXPORT_SYMBOL(transport_kmap_data_sg);
  1919. void transport_kunmap_data_sg(struct se_cmd *cmd)
  1920. {
  1921. if (!cmd->t_data_nents) {
  1922. return;
  1923. } else if (cmd->t_data_nents == 1) {
  1924. kunmap(sg_page(cmd->t_data_sg));
  1925. return;
  1926. }
  1927. vunmap(cmd->t_data_vmap);
  1928. cmd->t_data_vmap = NULL;
  1929. }
  1930. EXPORT_SYMBOL(transport_kunmap_data_sg);
  1931. int
  1932. target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, u32 length,
  1933. bool zero_page)
  1934. {
  1935. struct scatterlist *sg;
  1936. struct page *page;
  1937. gfp_t zero_flag = (zero_page) ? __GFP_ZERO : 0;
  1938. unsigned int nent;
  1939. int i = 0;
  1940. nent = DIV_ROUND_UP(length, PAGE_SIZE);
  1941. sg = kmalloc(sizeof(struct scatterlist) * nent, GFP_KERNEL);
  1942. if (!sg)
  1943. return -ENOMEM;
  1944. sg_init_table(sg, nent);
  1945. while (length) {
  1946. u32 page_len = min_t(u32, length, PAGE_SIZE);
  1947. page = alloc_page(GFP_KERNEL | zero_flag);
  1948. if (!page)
  1949. goto out;
  1950. sg_set_page(&sg[i], page, page_len, 0);
  1951. length -= page_len;
  1952. i++;
  1953. }
  1954. *sgl = sg;
  1955. *nents = nent;
  1956. return 0;
  1957. out:
  1958. while (i > 0) {
  1959. i--;
  1960. __free_page(sg_page(&sg[i]));
  1961. }
  1962. kfree(sg);
  1963. return -ENOMEM;
  1964. }
  1965. /*
  1966. * Allocate any required resources to execute the command. For writes we
  1967. * might not have the payload yet, so notify the fabric via a call to
  1968. * ->write_pending instead. Otherwise place it on the execution queue.
  1969. */
  1970. sense_reason_t
  1971. transport_generic_new_cmd(struct se_cmd *cmd)
  1972. {
  1973. int ret = 0;
  1974. /*
  1975. * Determine is the TCM fabric module has already allocated physical
  1976. * memory, and is directly calling transport_generic_map_mem_to_cmd()
  1977. * beforehand.
  1978. */
  1979. if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
  1980. cmd->data_length) {
  1981. bool zero_flag = !(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB);
  1982. if ((cmd->se_cmd_flags & SCF_BIDI) ||
  1983. (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) {
  1984. u32 bidi_length;
  1985. if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)
  1986. bidi_length = cmd->t_task_nolb *
  1987. cmd->se_dev->dev_attrib.block_size;
  1988. else
  1989. bidi_length = cmd->data_length;
  1990. ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
  1991. &cmd->t_bidi_data_nents,
  1992. bidi_length, zero_flag);
  1993. if (ret < 0)
  1994. return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
  1995. }
  1996. if (cmd->prot_op != TARGET_PROT_NORMAL) {
  1997. ret = target_alloc_sgl(&cmd->t_prot_sg,
  1998. &cmd->t_prot_nents,
  1999. cmd->prot_length, true);
  2000. if (ret < 0)
  2001. return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
  2002. }
  2003. ret = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
  2004. cmd->data_length, zero_flag);
  2005. if (ret < 0)
  2006. return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
  2007. }
  2008. /*
  2009. * If this command is not a write we can execute it right here,
  2010. * for write buffers we need to notify the fabric driver first
  2011. * and let it call back once the write buffers are ready.
  2012. */
  2013. target_add_to_state_list(cmd);
  2014. if (cmd->data_direction != DMA_TO_DEVICE || cmd->data_length == 0) {
  2015. target_execute_cmd(cmd);
  2016. return 0;
  2017. }
  2018. transport_cmd_check_stop(cmd, false, true);
  2019. ret = cmd->se_tfo->write_pending(cmd);
  2020. if (ret == -EAGAIN || ret == -ENOMEM)
  2021. goto queue_full;
  2022. /* fabric drivers should only return -EAGAIN or -ENOMEM as error */
  2023. WARN_ON(ret);
  2024. return (!ret) ? 0 : TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
  2025. queue_full:
  2026. pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
  2027. cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
  2028. transport_handle_queue_full(cmd, cmd->se_dev);
  2029. return 0;
  2030. }
  2031. EXPORT_SYMBOL(transport_generic_new_cmd);
  2032. static void transport_write_pending_qf(struct se_cmd *cmd)
  2033. {
  2034. int ret;
  2035. ret = cmd->se_tfo->write_pending(cmd);
  2036. if (ret == -EAGAIN || ret == -ENOMEM) {
  2037. pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
  2038. cmd);
  2039. transport_handle_queue_full(cmd, cmd->se_dev);
  2040. }
  2041. }
  2042. int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
  2043. {
  2044. unsigned long flags;
  2045. int ret = 0;
  2046. if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
  2047. if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
  2048. transport_wait_for_tasks(cmd);
  2049. ret = transport_release_cmd(cmd);
  2050. } else {
  2051. if (wait_for_tasks)
  2052. transport_wait_for_tasks(cmd);
  2053. /*
  2054. * Handle WRITE failure case where transport_generic_new_cmd()
  2055. * has already added se_cmd to state_list, but fabric has
  2056. * failed command before I/O submission.
  2057. */
  2058. if (cmd->state_active) {
  2059. spin_lock_irqsave(&cmd->t_state_lock, flags);
  2060. target_remove_from_state_list(cmd);
  2061. spin_unlock_irqrestore(&cmd->t_state_lock, flags);
  2062. }
  2063. if (cmd->se_lun)
  2064. transport_lun_remove_cmd(cmd);
  2065. ret = transport_put_cmd(cmd);
  2066. }
  2067. return ret;
  2068. }
  2069. EXPORT_SYMBOL(transport_generic_free_cmd);
  2070. /* target_get_sess_cmd - Add command to active ->sess_cmd_list
  2071. * @se_sess: session to reference
  2072. * @se_cmd: command descriptor to add
  2073. * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
  2074. */
  2075. int target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
  2076. bool ack_kref)
  2077. {
  2078. unsigned long flags;
  2079. int ret = 0;
  2080. /*
  2081. * Add a second kref if the fabric caller is expecting to handle
  2082. * fabric acknowledgement that requires two target_put_sess_cmd()
  2083. * invocations before se_cmd descriptor release.
  2084. */
  2085. if (ack_kref) {
  2086. kref_get(&se_cmd->cmd_kref);
  2087. se_cmd->se_cmd_flags |= SCF_ACK_KREF;
  2088. }
  2089. spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
  2090. if (se_sess->sess_tearing_down) {
  2091. ret = -ESHUTDOWN;
  2092. goto out;
  2093. }
  2094. list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
  2095. out:
  2096. spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
  2097. return ret;
  2098. }
  2099. EXPORT_SYMBOL(target_get_sess_cmd);
  2100. static void target_release_cmd_kref(struct kref *kref)
  2101. {
  2102. struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
  2103. struct se_session *se_sess = se_cmd->se_sess;
  2104. if (list_empty(&se_cmd->se_cmd_list)) {
  2105. spin_unlock(&se_sess->sess_cmd_lock);
  2106. se_cmd->se_tfo->release_cmd(se_cmd);
  2107. return;
  2108. }
  2109. if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
  2110. spin_unlock(&se_sess->sess_cmd_lock);
  2111. complete(&se_cmd->cmd_wait_comp);
  2112. return;
  2113. }
  2114. list_del(&se_cmd->se_cmd_list);
  2115. spin_unlock(&se_sess->sess_cmd_lock);
  2116. se_cmd->se_tfo->release_cmd(se_cmd);
  2117. }
  2118. /* target_put_sess_cmd - Check for active I/O shutdown via kref_put
  2119. * @se_sess: session to reference
  2120. * @se_cmd: command descriptor to drop
  2121. */
  2122. int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
  2123. {
  2124. if (!se_sess) {
  2125. se_cmd->se_tfo->release_cmd(se_cmd);
  2126. return 1;
  2127. }
  2128. return kref_put_spinlock_irqsave(&se_cmd->cmd_kref, target_release_cmd_kref,
  2129. &se_sess->sess_cmd_lock);
  2130. }
  2131. EXPORT_SYMBOL(target_put_sess_cmd);
  2132. /* target_sess_cmd_list_set_waiting - Flag all commands in
  2133. * sess_cmd_list to complete cmd_wait_comp. Set
  2134. * sess_tearing_down so no more commands are queued.
  2135. * @se_sess: session to flag
  2136. */
  2137. void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
  2138. {
  2139. struct se_cmd *se_cmd;
  2140. unsigned long flags;
  2141. spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
  2142. if (se_sess->sess_tearing_down) {
  2143. spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
  2144. return;
  2145. }
  2146. se_sess->sess_tearing_down = 1;
  2147. list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
  2148. list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
  2149. se_cmd->cmd_wait_set = 1;
  2150. spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
  2151. }
  2152. EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
  2153. /* target_wait_for_sess_cmds - Wait for outstanding descriptors
  2154. * @se_sess: session to wait for active I/O
  2155. */
  2156. void target_wait_for_sess_cmds(struct se_session *se_sess)
  2157. {
  2158. struct se_cmd *se_cmd, *tmp_cmd;
  2159. unsigned long flags;
  2160. list_for_each_entry_safe(se_cmd, tmp_cmd,
  2161. &se_sess->sess_wait_list, se_cmd_list) {
  2162. list_del(&se_cmd->se_cmd_list);
  2163. pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
  2164. " %d\n", se_cmd, se_cmd->t_state,
  2165. se_cmd->se_tfo->get_cmd_state(se_cmd));
  2166. wait_for_completion(&se_cmd->cmd_wait_comp);
  2167. pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
  2168. " fabric state: %d\n", se_cmd, se_cmd->t_state,
  2169. se_cmd->se_tfo->get_cmd_state(se_cmd));
  2170. se_cmd->se_tfo->release_cmd(se_cmd);
  2171. }
  2172. spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
  2173. WARN_ON(!list_empty(&se_sess->sess_cmd_list));
  2174. spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
  2175. }
  2176. EXPORT_SYMBOL(target_wait_for_sess_cmds);
  2177. static int transport_clear_lun_ref_thread(void *p)
  2178. {
  2179. struct se_lun *lun = p;
  2180. percpu_ref_kill(&lun->lun_ref);
  2181. wait_for_completion(&lun->lun_ref_comp);
  2182. complete(&lun->lun_shutdown_comp);
  2183. return 0;
  2184. }
  2185. int transport_clear_lun_ref(struct se_lun *lun)
  2186. {
  2187. struct task_struct *kt;
  2188. kt = kthread_run(transport_clear_lun_ref_thread, lun,
  2189. "tcm_cl_%u", lun->unpacked_lun);
  2190. if (IS_ERR(kt)) {
  2191. pr_err("Unable to start clear_lun thread\n");
  2192. return PTR_ERR(kt);
  2193. }
  2194. wait_for_completion(&lun->lun_shutdown_comp);
  2195. return 0;
  2196. }
  2197. /**
  2198. * transport_wait_for_tasks - wait for completion to occur
  2199. * @cmd: command to wait
  2200. *
  2201. * Called from frontend fabric context to wait for storage engine
  2202. * to pause and/or release frontend generated struct se_cmd.
  2203. */
  2204. bool transport_wait_for_tasks(struct se_cmd *cmd)
  2205. {
  2206. unsigned long flags;
  2207. spin_lock_irqsave(&cmd->t_state_lock, flags);
  2208. if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
  2209. !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
  2210. spin_unlock_irqrestore(&cmd->t_state_lock, flags);
  2211. return false;
  2212. }
  2213. if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
  2214. !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
  2215. spin_unlock_irqrestore(&cmd->t_state_lock, flags);
  2216. return false;
  2217. }
  2218. if (!(cmd->transport_state & CMD_T_ACTIVE)) {
  2219. spin_unlock_irqrestore(&cmd->t_state_lock, flags);
  2220. return false;
  2221. }
  2222. cmd->transport_state |= CMD_T_STOP;
  2223. pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
  2224. " i_state: %d, t_state: %d, CMD_T_STOP\n",
  2225. cmd, cmd->se_tfo->get_task_tag(cmd),
  2226. cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
  2227. spin_unlock_irqrestore(&cmd->t_state_lock, flags);
  2228. wait_for_completion(&cmd->t_transport_stop_comp);
  2229. spin_lock_irqsave(&cmd->t_state_lock, flags);
  2230. cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
  2231. pr_debug("wait_for_tasks: Stopped wait_for_completion("
  2232. "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
  2233. cmd->se_tfo->get_task_tag(cmd));
  2234. spin_unlock_irqrestore(&cmd->t_state_lock, flags);
  2235. return true;
  2236. }
  2237. EXPORT_SYMBOL(transport_wait_for_tasks);
  2238. static int transport_get_sense_codes(
  2239. struct se_cmd *cmd,
  2240. u8 *asc,
  2241. u8 *ascq)
  2242. {
  2243. *asc = cmd->scsi_asc;
  2244. *ascq = cmd->scsi_ascq;
  2245. return 0;
  2246. }
  2247. static
  2248. void transport_err_sector_info(unsigned char *buffer, sector_t bad_sector)
  2249. {
  2250. /* Place failed LBA in sense data information descriptor 0. */
  2251. buffer[SPC_ADD_SENSE_LEN_OFFSET] = 0xc;
  2252. buffer[SPC_DESC_TYPE_OFFSET] = 0; /* Information */
  2253. buffer[SPC_ADDITIONAL_DESC_LEN_OFFSET] = 0xa;
  2254. buffer[SPC_VALIDITY_OFFSET] = 0x80;
  2255. /* Descriptor Information: failing sector */
  2256. put_unaligned_be64(bad_sector, &buffer[12]);
  2257. }
  2258. int
  2259. transport_send_check_condition_and_sense(struct se_cmd *cmd,
  2260. sense_reason_t reason, int from_transport)
  2261. {
  2262. unsigned char *buffer = cmd->sense_buffer;
  2263. unsigned long flags;
  2264. u8 asc = 0, ascq = 0;
  2265. spin_lock_irqsave(&cmd->t_state_lock, flags);
  2266. if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
  2267. spin_unlock_irqrestore(&cmd->t_state_lock, flags);
  2268. return 0;
  2269. }
  2270. cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
  2271. spin_unlock_irqrestore(&cmd->t_state_lock, flags);
  2272. if (!reason && from_transport)
  2273. goto after_reason;
  2274. if (!from_transport)
  2275. cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
  2276. /*
  2277. * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
  2278. * SENSE KEY values from include/scsi/scsi.h
  2279. */
  2280. switch (reason) {
  2281. case TCM_NO_SENSE:
  2282. /* CURRENT ERROR */
  2283. buffer[0] = 0x70;
  2284. buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
  2285. /* Not Ready */
  2286. buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
  2287. /* NO ADDITIONAL SENSE INFORMATION */
  2288. buffer[SPC_ASC_KEY_OFFSET] = 0;
  2289. buffer[SPC_ASCQ_KEY_OFFSET] = 0;
  2290. break;
  2291. case TCM_NON_EXISTENT_LUN:
  2292. /* CURRENT ERROR */
  2293. buffer[0] = 0x70;
  2294. buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
  2295. /* ILLEGAL REQUEST */
  2296. buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
  2297. /* LOGICAL UNIT NOT SUPPORTED */
  2298. buffer[SPC_ASC_KEY_OFFSET] = 0x25;
  2299. break;
  2300. case TCM_UNSUPPORTED_SCSI_OPCODE:
  2301. case TCM_SECTOR_COUNT_TOO_MANY:
  2302. /* CURRENT ERROR */
  2303. buffer[0] = 0x70;
  2304. buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
  2305. /* ILLEGAL REQUEST */
  2306. buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
  2307. /* INVALID COMMAND OPERATION CODE */
  2308. buffer[SPC_ASC_KEY_OFFSET] = 0x20;
  2309. break;
  2310. case TCM_UNKNOWN_MODE_PAGE:
  2311. /* CURRENT ERROR */
  2312. buffer[0] = 0x70;
  2313. buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
  2314. /* ILLEGAL REQUEST */
  2315. buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
  2316. /* INVALID FIELD IN CDB */
  2317. buffer[SPC_ASC_KEY_OFFSET] = 0x24;
  2318. break;
  2319. case TCM_CHECK_CONDITION_ABORT_CMD:
  2320. /* CURRENT ERROR */
  2321. buffer[0] = 0x70;
  2322. buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
  2323. /* ABORTED COMMAND */
  2324. buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
  2325. /* BUS DEVICE RESET FUNCTION OCCURRED */
  2326. buffer[SPC_ASC_KEY_OFFSET] = 0x29;
  2327. buffer[SPC_ASCQ_KEY_OFFSET] = 0x03;
  2328. break;
  2329. case TCM_INCORRECT_AMOUNT_OF_DATA:
  2330. /* CURRENT ERROR */
  2331. buffer[0] = 0x70;
  2332. buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
  2333. /* ABORTED COMMAND */
  2334. buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
  2335. /* WRITE ERROR */
  2336. buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
  2337. /* NOT ENOUGH UNSOLICITED DATA */
  2338. buffer[SPC_ASCQ_KEY_OFFSET] = 0x0d;
  2339. break;
  2340. case TCM_INVALID_CDB_FIELD:
  2341. /* CURRENT ERROR */
  2342. buffer[0] = 0x70;
  2343. buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
  2344. /* ILLEGAL REQUEST */
  2345. buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
  2346. /* INVALID FIELD IN CDB */
  2347. buffer[SPC_ASC_KEY_OFFSET] = 0x24;
  2348. break;
  2349. case TCM_INVALID_PARAMETER_LIST:
  2350. /* CURRENT ERROR */
  2351. buffer[0] = 0x70;
  2352. buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
  2353. /* ILLEGAL REQUEST */
  2354. buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
  2355. /* INVALID FIELD IN PARAMETER LIST */
  2356. buffer[SPC_ASC_KEY_OFFSET] = 0x26;
  2357. break;
  2358. case TCM_PARAMETER_LIST_LENGTH_ERROR:
  2359. /* CURRENT ERROR */
  2360. buffer[0] = 0x70;
  2361. buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
  2362. /* ILLEGAL REQUEST */
  2363. buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
  2364. /* PARAMETER LIST LENGTH ERROR */
  2365. buffer[SPC_ASC_KEY_OFFSET] = 0x1a;
  2366. break;
  2367. case TCM_UNEXPECTED_UNSOLICITED_DATA:
  2368. /* CURRENT ERROR */
  2369. buffer[0] = 0x70;
  2370. buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
  2371. /* ABORTED COMMAND */
  2372. buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
  2373. /* WRITE ERROR */
  2374. buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
  2375. /* UNEXPECTED_UNSOLICITED_DATA */
  2376. buffer[SPC_ASCQ_KEY_OFFSET] = 0x0c;
  2377. break;
  2378. case TCM_SERVICE_CRC_ERROR:
  2379. /* CURRENT ERROR */
  2380. buffer[0] = 0x70;
  2381. buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
  2382. /* ABORTED COMMAND */
  2383. buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
  2384. /* PROTOCOL SERVICE CRC ERROR */
  2385. buffer[SPC_ASC_KEY_OFFSET] = 0x47;
  2386. /* N/A */
  2387. buffer[SPC_ASCQ_KEY_OFFSET] = 0x05;
  2388. break;
  2389. case TCM_SNACK_REJECTED:
  2390. /* CURRENT ERROR */
  2391. buffer[0] = 0x70;
  2392. buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
  2393. /* ABORTED COMMAND */
  2394. buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
  2395. /* READ ERROR */
  2396. buffer[SPC_ASC_KEY_OFFSET] = 0x11;
  2397. /* FAILED RETRANSMISSION REQUEST */
  2398. buffer[SPC_ASCQ_KEY_OFFSET] = 0x13;
  2399. break;
  2400. case TCM_WRITE_PROTECTED:
  2401. /* CURRENT ERROR */
  2402. buffer[0] = 0x70;
  2403. buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
  2404. /* DATA PROTECT */
  2405. buffer[SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
  2406. /* WRITE PROTECTED */
  2407. buffer[SPC_ASC_KEY_OFFSET] = 0x27;
  2408. break;
  2409. case TCM_ADDRESS_OUT_OF_RANGE:
  2410. /* CURRENT ERROR */
  2411. buffer[0] = 0x70;
  2412. buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
  2413. /* ILLEGAL REQUEST */
  2414. buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
  2415. /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
  2416. buffer[SPC_ASC_KEY_OFFSET] = 0x21;
  2417. break;
  2418. case TCM_CHECK_CONDITION_UNIT_ATTENTION:
  2419. /* CURRENT ERROR */
  2420. buffer[0] = 0x70;
  2421. buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
  2422. /* UNIT ATTENTION */
  2423. buffer[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
  2424. core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
  2425. buffer[SPC_ASC_KEY_OFFSET] = asc;
  2426. buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
  2427. break;
  2428. case TCM_CHECK_CONDITION_NOT_READY:
  2429. /* CURRENT ERROR */
  2430. buffer[0] = 0x70;
  2431. buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
  2432. /* Not Ready */
  2433. buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
  2434. transport_get_sense_codes(cmd, &asc, &ascq);
  2435. buffer[SPC_ASC_KEY_OFFSET] = asc;
  2436. buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
  2437. break;
  2438. case TCM_MISCOMPARE_VERIFY:
  2439. /* CURRENT ERROR */
  2440. buffer[0] = 0x70;
  2441. buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
  2442. buffer[SPC_SENSE_KEY_OFFSET] = MISCOMPARE;
  2443. /* MISCOMPARE DURING VERIFY OPERATION */
  2444. buffer[SPC_ASC_KEY_OFFSET] = 0x1d;
  2445. buffer[SPC_ASCQ_KEY_OFFSET] = 0x00;
  2446. break;
  2447. case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED:
  2448. /* CURRENT ERROR */
  2449. buffer[0] = 0x70;
  2450. buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
  2451. /* ILLEGAL REQUEST */
  2452. buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
  2453. /* LOGICAL BLOCK GUARD CHECK FAILED */
  2454. buffer[SPC_ASC_KEY_OFFSET] = 0x10;
  2455. buffer[SPC_ASCQ_KEY_OFFSET] = 0x01;
  2456. transport_err_sector_info(buffer, cmd->bad_sector);
  2457. break;
  2458. case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED:
  2459. /* CURRENT ERROR */
  2460. buffer[0] = 0x70;
  2461. buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
  2462. /* ILLEGAL REQUEST */
  2463. buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
  2464. /* LOGICAL BLOCK APPLICATION TAG CHECK FAILED */
  2465. buffer[SPC_ASC_KEY_OFFSET] = 0x10;
  2466. buffer[SPC_ASCQ_KEY_OFFSET] = 0x02;
  2467. transport_err_sector_info(buffer, cmd->bad_sector);
  2468. break;
  2469. case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED:
  2470. /* CURRENT ERROR */
  2471. buffer[0] = 0x70;
  2472. buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
  2473. /* ILLEGAL REQUEST */
  2474. buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
  2475. /* LOGICAL BLOCK REFERENCE TAG CHECK FAILED */
  2476. buffer[SPC_ASC_KEY_OFFSET] = 0x10;
  2477. buffer[SPC_ASCQ_KEY_OFFSET] = 0x03;
  2478. transport_err_sector_info(buffer, cmd->bad_sector);
  2479. break;
  2480. case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
  2481. default:
  2482. /* CURRENT ERROR */
  2483. buffer[0] = 0x70;
  2484. buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
  2485. /*
  2486. * Returning ILLEGAL REQUEST would cause immediate IO errors on
  2487. * Solaris initiators. Returning NOT READY instead means the
  2488. * operations will be retried a finite number of times and we
  2489. * can survive intermittent errors.
  2490. */
  2491. buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
  2492. /* LOGICAL UNIT COMMUNICATION FAILURE */
  2493. buffer[SPC_ASC_KEY_OFFSET] = 0x08;
  2494. break;
  2495. }
  2496. /*
  2497. * This code uses linux/include/scsi/scsi.h SAM status codes!
  2498. */
  2499. cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
  2500. /*
  2501. * Automatically padded, this value is encoded in the fabric's
  2502. * data_length response PDU containing the SCSI defined sense data.
  2503. */
  2504. cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
  2505. after_reason:
  2506. trace_target_cmd_complete(cmd);
  2507. return cmd->se_tfo->queue_status(cmd);
  2508. }
  2509. EXPORT_SYMBOL(transport_send_check_condition_and_sense);
  2510. int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
  2511. {
  2512. if (!(cmd->transport_state & CMD_T_ABORTED))
  2513. return 0;
  2514. /*
  2515. * If cmd has been aborted but either no status is to be sent or it has
  2516. * already been sent, just return
  2517. */
  2518. if (!send_status || !(cmd->se_cmd_flags & SCF_SEND_DELAYED_TAS))
  2519. return 1;
  2520. pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB: 0x%02x ITT: 0x%08x\n",
  2521. cmd->t_task_cdb[0], cmd->se_tfo->get_task_tag(cmd));
  2522. cmd->se_cmd_flags &= ~SCF_SEND_DELAYED_TAS;
  2523. cmd->scsi_status = SAM_STAT_TASK_ABORTED;
  2524. trace_target_cmd_complete(cmd);
  2525. cmd->se_tfo->queue_status(cmd);
  2526. return 1;
  2527. }
  2528. EXPORT_SYMBOL(transport_check_aborted_status);
  2529. void transport_send_task_abort(struct se_cmd *cmd)
  2530. {
  2531. unsigned long flags;
  2532. spin_lock_irqsave(&cmd->t_state_lock, flags);
  2533. if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION)) {
  2534. spin_unlock_irqrestore(&cmd->t_state_lock, flags);
  2535. return;
  2536. }
  2537. spin_unlock_irqrestore(&cmd->t_state_lock, flags);
  2538. /*
  2539. * If there are still expected incoming fabric WRITEs, we wait
  2540. * until until they have completed before sending a TASK_ABORTED
  2541. * response. This response with TASK_ABORTED status will be
  2542. * queued back to fabric module by transport_check_aborted_status().
  2543. */
  2544. if (cmd->data_direction == DMA_TO_DEVICE) {
  2545. if (cmd->se_tfo->write_pending_status(cmd) != 0) {
  2546. cmd->transport_state |= CMD_T_ABORTED;
  2547. cmd->se_cmd_flags |= SCF_SEND_DELAYED_TAS;
  2548. return;
  2549. }
  2550. }
  2551. cmd->scsi_status = SAM_STAT_TASK_ABORTED;
  2552. transport_lun_remove_cmd(cmd);
  2553. pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
  2554. " ITT: 0x%08x\n", cmd->t_task_cdb[0],
  2555. cmd->se_tfo->get_task_tag(cmd));
  2556. trace_target_cmd_complete(cmd);
  2557. cmd->se_tfo->queue_status(cmd);
  2558. }
  2559. static void target_tmr_work(struct work_struct *work)
  2560. {
  2561. struct se_cmd *cmd = container_of(work, struct se_cmd, work);
  2562. struct se_device *dev = cmd->se_dev;
  2563. struct se_tmr_req *tmr = cmd->se_tmr_req;
  2564. int ret;
  2565. switch (tmr->function) {
  2566. case TMR_ABORT_TASK:
  2567. core_tmr_abort_task(dev, tmr, cmd->se_sess);
  2568. break;
  2569. case TMR_ABORT_TASK_SET:
  2570. case TMR_CLEAR_ACA:
  2571. case TMR_CLEAR_TASK_SET:
  2572. tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
  2573. break;
  2574. case TMR_LUN_RESET:
  2575. ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
  2576. tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
  2577. TMR_FUNCTION_REJECTED;
  2578. break;
  2579. case TMR_TARGET_WARM_RESET:
  2580. tmr->response = TMR_FUNCTION_REJECTED;
  2581. break;
  2582. case TMR_TARGET_COLD_RESET:
  2583. tmr->response = TMR_FUNCTION_REJECTED;
  2584. break;
  2585. default:
  2586. pr_err("Uknown TMR function: 0x%02x.\n",
  2587. tmr->function);
  2588. tmr->response = TMR_FUNCTION_REJECTED;
  2589. break;
  2590. }
  2591. cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
  2592. cmd->se_tfo->queue_tm_rsp(cmd);
  2593. transport_cmd_check_stop_to_fabric(cmd);
  2594. }
  2595. int transport_generic_handle_tmr(
  2596. struct se_cmd *cmd)
  2597. {
  2598. unsigned long flags;
  2599. spin_lock_irqsave(&cmd->t_state_lock, flags);
  2600. cmd->transport_state |= CMD_T_ACTIVE;
  2601. spin_unlock_irqrestore(&cmd->t_state_lock, flags);
  2602. INIT_WORK(&cmd->work, target_tmr_work);
  2603. queue_work(cmd->se_dev->tmr_wq, &cmd->work);
  2604. return 0;
  2605. }
  2606. EXPORT_SYMBOL(transport_generic_handle_tmr);