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c66ac9db NB |
1 | /******************************************************************************* |
2 | * Filename: target_core_transport.c | |
3 | * | |
4 | * This file contains the Generic Target Engine Core. | |
5 | * | |
6 | * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc. | |
7 | * Copyright (c) 2005, 2006, 2007 SBE, Inc. | |
8 | * Copyright (c) 2007-2010 Rising Tide Systems | |
9 | * Copyright (c) 2008-2010 Linux-iSCSI.org | |
10 | * | |
11 | * Nicholas A. Bellinger <nab@kernel.org> | |
12 | * | |
13 | * This program is free software; you can redistribute it and/or modify | |
14 | * it under the terms of the GNU General Public License as published by | |
15 | * the Free Software Foundation; either version 2 of the License, or | |
16 | * (at your option) any later version. | |
17 | * | |
18 | * This program is distributed in the hope that it will be useful, | |
19 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
21 | * GNU General Public License for more details. | |
22 | * | |
23 | * You should have received a copy of the GNU General Public License | |
24 | * along with this program; if not, write to the Free Software | |
25 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
26 | * | |
27 | ******************************************************************************/ | |
28 | ||
c66ac9db NB |
29 | #include <linux/net.h> |
30 | #include <linux/delay.h> | |
31 | #include <linux/string.h> | |
32 | #include <linux/timer.h> | |
33 | #include <linux/slab.h> | |
34 | #include <linux/blkdev.h> | |
35 | #include <linux/spinlock.h> | |
c66ac9db NB |
36 | #include <linux/kthread.h> |
37 | #include <linux/in.h> | |
38 | #include <linux/cdrom.h> | |
827509e3 | 39 | #include <linux/module.h> |
c66ac9db NB |
40 | #include <asm/unaligned.h> |
41 | #include <net/sock.h> | |
42 | #include <net/tcp.h> | |
43 | #include <scsi/scsi.h> | |
44 | #include <scsi/scsi_cmnd.h> | |
e66ecd50 | 45 | #include <scsi/scsi_tcq.h> |
c66ac9db NB |
46 | |
47 | #include <target/target_core_base.h> | |
c4795fb2 CH |
48 | #include <target/target_core_backend.h> |
49 | #include <target/target_core_fabric.h> | |
c66ac9db NB |
50 | #include <target/target_core_configfs.h> |
51 | ||
e26d99ae | 52 | #include "target_core_internal.h" |
c66ac9db | 53 | #include "target_core_alua.h" |
c66ac9db | 54 | #include "target_core_pr.h" |
c66ac9db NB |
55 | #include "target_core_ua.h" |
56 | ||
e3d6f909 | 57 | static int sub_api_initialized; |
c66ac9db | 58 | |
35e0e757 | 59 | static struct workqueue_struct *target_completion_wq; |
c66ac9db | 60 | static struct kmem_cache *se_sess_cache; |
c66ac9db | 61 | struct kmem_cache *se_ua_cache; |
c66ac9db NB |
62 | struct kmem_cache *t10_pr_reg_cache; |
63 | struct kmem_cache *t10_alua_lu_gp_cache; | |
64 | struct kmem_cache *t10_alua_lu_gp_mem_cache; | |
65 | struct kmem_cache *t10_alua_tg_pt_gp_cache; | |
66 | struct kmem_cache *t10_alua_tg_pt_gp_mem_cache; | |
67 | ||
c66ac9db | 68 | static int transport_generic_write_pending(struct se_cmd *); |
5951146d | 69 | static int transport_processing_thread(void *param); |
4d2300cc | 70 | static int __transport_execute_tasks(struct se_device *dev, struct se_cmd *); |
c66ac9db | 71 | static void transport_complete_task_attr(struct se_cmd *cmd); |
07bde79a | 72 | static void transport_handle_queue_full(struct se_cmd *cmd, |
e057f533 | 73 | struct se_device *dev); |
c66ac9db | 74 | static void transport_free_dev_tasks(struct se_cmd *cmd); |
05d1c7c0 | 75 | static int transport_generic_get_mem(struct se_cmd *cmd); |
39c05f32 | 76 | static void transport_put_cmd(struct se_cmd *cmd); |
3df8d40b | 77 | static void transport_remove_cmd_from_queue(struct se_cmd *cmd); |
c66ac9db | 78 | static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq); |
35e0e757 | 79 | static void target_complete_ok_work(struct work_struct *work); |
c66ac9db | 80 | |
e3d6f909 | 81 | int init_se_kmem_caches(void) |
c66ac9db | 82 | { |
c66ac9db NB |
83 | se_sess_cache = kmem_cache_create("se_sess_cache", |
84 | sizeof(struct se_session), __alignof__(struct se_session), | |
85 | 0, NULL); | |
6708bb27 AG |
86 | if (!se_sess_cache) { |
87 | pr_err("kmem_cache_create() for struct se_session" | |
c66ac9db | 88 | " failed\n"); |
c8e31f26 | 89 | goto out; |
c66ac9db NB |
90 | } |
91 | se_ua_cache = kmem_cache_create("se_ua_cache", | |
92 | sizeof(struct se_ua), __alignof__(struct se_ua), | |
93 | 0, NULL); | |
6708bb27 AG |
94 | if (!se_ua_cache) { |
95 | pr_err("kmem_cache_create() for struct se_ua failed\n"); | |
35e0e757 | 96 | goto out_free_sess_cache; |
c66ac9db | 97 | } |
c66ac9db NB |
98 | t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache", |
99 | sizeof(struct t10_pr_registration), | |
100 | __alignof__(struct t10_pr_registration), 0, NULL); | |
6708bb27 AG |
101 | if (!t10_pr_reg_cache) { |
102 | pr_err("kmem_cache_create() for struct t10_pr_registration" | |
c66ac9db | 103 | " failed\n"); |
35e0e757 | 104 | goto out_free_ua_cache; |
c66ac9db NB |
105 | } |
106 | t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache", | |
107 | sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp), | |
108 | 0, NULL); | |
6708bb27 AG |
109 | if (!t10_alua_lu_gp_cache) { |
110 | pr_err("kmem_cache_create() for t10_alua_lu_gp_cache" | |
c66ac9db | 111 | " failed\n"); |
35e0e757 | 112 | goto out_free_pr_reg_cache; |
c66ac9db NB |
113 | } |
114 | t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache", | |
115 | sizeof(struct t10_alua_lu_gp_member), | |
116 | __alignof__(struct t10_alua_lu_gp_member), 0, NULL); | |
6708bb27 AG |
117 | if (!t10_alua_lu_gp_mem_cache) { |
118 | pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_" | |
c66ac9db | 119 | "cache failed\n"); |
35e0e757 | 120 | goto out_free_lu_gp_cache; |
c66ac9db NB |
121 | } |
122 | t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache", | |
123 | sizeof(struct t10_alua_tg_pt_gp), | |
124 | __alignof__(struct t10_alua_tg_pt_gp), 0, NULL); | |
6708bb27 AG |
125 | if (!t10_alua_tg_pt_gp_cache) { |
126 | pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_" | |
c66ac9db | 127 | "cache failed\n"); |
35e0e757 | 128 | goto out_free_lu_gp_mem_cache; |
c66ac9db NB |
129 | } |
130 | t10_alua_tg_pt_gp_mem_cache = kmem_cache_create( | |
131 | "t10_alua_tg_pt_gp_mem_cache", | |
132 | sizeof(struct t10_alua_tg_pt_gp_member), | |
133 | __alignof__(struct t10_alua_tg_pt_gp_member), | |
134 | 0, NULL); | |
6708bb27 AG |
135 | if (!t10_alua_tg_pt_gp_mem_cache) { |
136 | pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_" | |
c66ac9db | 137 | "mem_t failed\n"); |
35e0e757 | 138 | goto out_free_tg_pt_gp_cache; |
c66ac9db NB |
139 | } |
140 | ||
35e0e757 CH |
141 | target_completion_wq = alloc_workqueue("target_completion", |
142 | WQ_MEM_RECLAIM, 0); | |
143 | if (!target_completion_wq) | |
144 | goto out_free_tg_pt_gp_mem_cache; | |
145 | ||
c66ac9db | 146 | return 0; |
35e0e757 CH |
147 | |
148 | out_free_tg_pt_gp_mem_cache: | |
149 | kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache); | |
150 | out_free_tg_pt_gp_cache: | |
151 | kmem_cache_destroy(t10_alua_tg_pt_gp_cache); | |
152 | out_free_lu_gp_mem_cache: | |
153 | kmem_cache_destroy(t10_alua_lu_gp_mem_cache); | |
154 | out_free_lu_gp_cache: | |
155 | kmem_cache_destroy(t10_alua_lu_gp_cache); | |
156 | out_free_pr_reg_cache: | |
157 | kmem_cache_destroy(t10_pr_reg_cache); | |
158 | out_free_ua_cache: | |
159 | kmem_cache_destroy(se_ua_cache); | |
160 | out_free_sess_cache: | |
161 | kmem_cache_destroy(se_sess_cache); | |
c66ac9db | 162 | out: |
e3d6f909 | 163 | return -ENOMEM; |
c66ac9db NB |
164 | } |
165 | ||
e3d6f909 | 166 | void release_se_kmem_caches(void) |
c66ac9db | 167 | { |
35e0e757 | 168 | destroy_workqueue(target_completion_wq); |
c66ac9db NB |
169 | kmem_cache_destroy(se_sess_cache); |
170 | kmem_cache_destroy(se_ua_cache); | |
c66ac9db NB |
171 | kmem_cache_destroy(t10_pr_reg_cache); |
172 | kmem_cache_destroy(t10_alua_lu_gp_cache); | |
173 | kmem_cache_destroy(t10_alua_lu_gp_mem_cache); | |
174 | kmem_cache_destroy(t10_alua_tg_pt_gp_cache); | |
175 | kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache); | |
c66ac9db NB |
176 | } |
177 | ||
e3d6f909 AG |
178 | /* This code ensures unique mib indexes are handed out. */ |
179 | static DEFINE_SPINLOCK(scsi_mib_index_lock); | |
180 | static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX]; | |
e89d15ee NB |
181 | |
182 | /* | |
183 | * Allocate a new row index for the entry type specified | |
184 | */ | |
185 | u32 scsi_get_new_index(scsi_index_t type) | |
186 | { | |
187 | u32 new_index; | |
188 | ||
e3d6f909 | 189 | BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX)); |
e89d15ee | 190 | |
e3d6f909 AG |
191 | spin_lock(&scsi_mib_index_lock); |
192 | new_index = ++scsi_mib_index[type]; | |
193 | spin_unlock(&scsi_mib_index_lock); | |
e89d15ee NB |
194 | |
195 | return new_index; | |
196 | } | |
197 | ||
e26d99ae | 198 | static void transport_init_queue_obj(struct se_queue_obj *qobj) |
c66ac9db NB |
199 | { |
200 | atomic_set(&qobj->queue_cnt, 0); | |
201 | INIT_LIST_HEAD(&qobj->qobj_list); | |
202 | init_waitqueue_head(&qobj->thread_wq); | |
203 | spin_lock_init(&qobj->cmd_queue_lock); | |
204 | } | |
c66ac9db | 205 | |
dbc5623e | 206 | void transport_subsystem_check_init(void) |
c66ac9db NB |
207 | { |
208 | int ret; | |
209 | ||
dbc5623e NB |
210 | if (sub_api_initialized) |
211 | return; | |
212 | ||
c66ac9db NB |
213 | ret = request_module("target_core_iblock"); |
214 | if (ret != 0) | |
6708bb27 | 215 | pr_err("Unable to load target_core_iblock\n"); |
c66ac9db NB |
216 | |
217 | ret = request_module("target_core_file"); | |
218 | if (ret != 0) | |
6708bb27 | 219 | pr_err("Unable to load target_core_file\n"); |
c66ac9db NB |
220 | |
221 | ret = request_module("target_core_pscsi"); | |
222 | if (ret != 0) | |
6708bb27 | 223 | pr_err("Unable to load target_core_pscsi\n"); |
c66ac9db NB |
224 | |
225 | ret = request_module("target_core_stgt"); | |
226 | if (ret != 0) | |
6708bb27 | 227 | pr_err("Unable to load target_core_stgt\n"); |
c66ac9db | 228 | |
e3d6f909 | 229 | sub_api_initialized = 1; |
dbc5623e | 230 | return; |
c66ac9db NB |
231 | } |
232 | ||
233 | struct se_session *transport_init_session(void) | |
234 | { | |
235 | struct se_session *se_sess; | |
236 | ||
237 | se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL); | |
6708bb27 AG |
238 | if (!se_sess) { |
239 | pr_err("Unable to allocate struct se_session from" | |
c66ac9db NB |
240 | " se_sess_cache\n"); |
241 | return ERR_PTR(-ENOMEM); | |
242 | } | |
243 | INIT_LIST_HEAD(&se_sess->sess_list); | |
244 | INIT_LIST_HEAD(&se_sess->sess_acl_list); | |
a17f091d NB |
245 | INIT_LIST_HEAD(&se_sess->sess_cmd_list); |
246 | INIT_LIST_HEAD(&se_sess->sess_wait_list); | |
247 | spin_lock_init(&se_sess->sess_cmd_lock); | |
c66ac9db NB |
248 | |
249 | return se_sess; | |
250 | } | |
251 | EXPORT_SYMBOL(transport_init_session); | |
252 | ||
253 | /* | |
254 | * Called with spin_lock_bh(&struct se_portal_group->session_lock called. | |
255 | */ | |
256 | void __transport_register_session( | |
257 | struct se_portal_group *se_tpg, | |
258 | struct se_node_acl *se_nacl, | |
259 | struct se_session *se_sess, | |
260 | void *fabric_sess_ptr) | |
261 | { | |
262 | unsigned char buf[PR_REG_ISID_LEN]; | |
263 | ||
264 | se_sess->se_tpg = se_tpg; | |
265 | se_sess->fabric_sess_ptr = fabric_sess_ptr; | |
266 | /* | |
267 | * Used by struct se_node_acl's under ConfigFS to locate active se_session-t | |
268 | * | |
269 | * Only set for struct se_session's that will actually be moving I/O. | |
270 | * eg: *NOT* discovery sessions. | |
271 | */ | |
272 | if (se_nacl) { | |
273 | /* | |
274 | * If the fabric module supports an ISID based TransportID, | |
275 | * save this value in binary from the fabric I_T Nexus now. | |
276 | */ | |
e3d6f909 | 277 | if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { |
c66ac9db | 278 | memset(&buf[0], 0, PR_REG_ISID_LEN); |
e3d6f909 | 279 | se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, |
c66ac9db NB |
280 | &buf[0], PR_REG_ISID_LEN); |
281 | se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]); | |
282 | } | |
283 | spin_lock_irq(&se_nacl->nacl_sess_lock); | |
284 | /* | |
285 | * The se_nacl->nacl_sess pointer will be set to the | |
286 | * last active I_T Nexus for each struct se_node_acl. | |
287 | */ | |
288 | se_nacl->nacl_sess = se_sess; | |
289 | ||
290 | list_add_tail(&se_sess->sess_acl_list, | |
291 | &se_nacl->acl_sess_list); | |
292 | spin_unlock_irq(&se_nacl->nacl_sess_lock); | |
293 | } | |
294 | list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list); | |
295 | ||
6708bb27 | 296 | pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n", |
e3d6f909 | 297 | se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr); |
c66ac9db NB |
298 | } |
299 | EXPORT_SYMBOL(__transport_register_session); | |
300 | ||
301 | void transport_register_session( | |
302 | struct se_portal_group *se_tpg, | |
303 | struct se_node_acl *se_nacl, | |
304 | struct se_session *se_sess, | |
305 | void *fabric_sess_ptr) | |
306 | { | |
307 | spin_lock_bh(&se_tpg->session_lock); | |
308 | __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr); | |
309 | spin_unlock_bh(&se_tpg->session_lock); | |
310 | } | |
311 | EXPORT_SYMBOL(transport_register_session); | |
312 | ||
313 | void transport_deregister_session_configfs(struct se_session *se_sess) | |
314 | { | |
315 | struct se_node_acl *se_nacl; | |
23388864 | 316 | unsigned long flags; |
c66ac9db NB |
317 | /* |
318 | * Used by struct se_node_acl's under ConfigFS to locate active struct se_session | |
319 | */ | |
320 | se_nacl = se_sess->se_node_acl; | |
6708bb27 | 321 | if (se_nacl) { |
23388864 | 322 | spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags); |
c66ac9db NB |
323 | list_del(&se_sess->sess_acl_list); |
324 | /* | |
325 | * If the session list is empty, then clear the pointer. | |
326 | * Otherwise, set the struct se_session pointer from the tail | |
327 | * element of the per struct se_node_acl active session list. | |
328 | */ | |
329 | if (list_empty(&se_nacl->acl_sess_list)) | |
330 | se_nacl->nacl_sess = NULL; | |
331 | else { | |
332 | se_nacl->nacl_sess = container_of( | |
333 | se_nacl->acl_sess_list.prev, | |
334 | struct se_session, sess_acl_list); | |
335 | } | |
23388864 | 336 | spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags); |
c66ac9db NB |
337 | } |
338 | } | |
339 | EXPORT_SYMBOL(transport_deregister_session_configfs); | |
340 | ||
341 | void transport_free_session(struct se_session *se_sess) | |
342 | { | |
343 | kmem_cache_free(se_sess_cache, se_sess); | |
344 | } | |
345 | EXPORT_SYMBOL(transport_free_session); | |
346 | ||
347 | void transport_deregister_session(struct se_session *se_sess) | |
348 | { | |
349 | struct se_portal_group *se_tpg = se_sess->se_tpg; | |
350 | struct se_node_acl *se_nacl; | |
e63a8e19 | 351 | unsigned long flags; |
c66ac9db | 352 | |
6708bb27 | 353 | if (!se_tpg) { |
c66ac9db NB |
354 | transport_free_session(se_sess); |
355 | return; | |
356 | } | |
c66ac9db | 357 | |
e63a8e19 | 358 | spin_lock_irqsave(&se_tpg->session_lock, flags); |
c66ac9db NB |
359 | list_del(&se_sess->sess_list); |
360 | se_sess->se_tpg = NULL; | |
361 | se_sess->fabric_sess_ptr = NULL; | |
e63a8e19 | 362 | spin_unlock_irqrestore(&se_tpg->session_lock, flags); |
c66ac9db NB |
363 | |
364 | /* | |
365 | * Determine if we need to do extra work for this initiator node's | |
366 | * struct se_node_acl if it had been previously dynamically generated. | |
367 | */ | |
368 | se_nacl = se_sess->se_node_acl; | |
6708bb27 | 369 | if (se_nacl) { |
e63a8e19 | 370 | spin_lock_irqsave(&se_tpg->acl_node_lock, flags); |
c66ac9db | 371 | if (se_nacl->dynamic_node_acl) { |
6708bb27 AG |
372 | if (!se_tpg->se_tpg_tfo->tpg_check_demo_mode_cache( |
373 | se_tpg)) { | |
c66ac9db NB |
374 | list_del(&se_nacl->acl_list); |
375 | se_tpg->num_node_acls--; | |
e63a8e19 | 376 | spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags); |
c66ac9db NB |
377 | |
378 | core_tpg_wait_for_nacl_pr_ref(se_nacl); | |
c66ac9db | 379 | core_free_device_list_for_node(se_nacl, se_tpg); |
e3d6f909 | 380 | se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg, |
c66ac9db | 381 | se_nacl); |
e63a8e19 | 382 | spin_lock_irqsave(&se_tpg->acl_node_lock, flags); |
c66ac9db NB |
383 | } |
384 | } | |
e63a8e19 | 385 | spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags); |
c66ac9db NB |
386 | } |
387 | ||
388 | transport_free_session(se_sess); | |
389 | ||
6708bb27 | 390 | pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n", |
e3d6f909 | 391 | se_tpg->se_tpg_tfo->get_fabric_name()); |
c66ac9db NB |
392 | } |
393 | EXPORT_SYMBOL(transport_deregister_session); | |
394 | ||
395 | /* | |
a1d8b49a | 396 | * Called with cmd->t_state_lock held. |
c66ac9db NB |
397 | */ |
398 | static void transport_all_task_dev_remove_state(struct se_cmd *cmd) | |
399 | { | |
42bf829e | 400 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
401 | struct se_task *task; |
402 | unsigned long flags; | |
403 | ||
42bf829e CH |
404 | if (!dev) |
405 | return; | |
c66ac9db | 406 | |
42bf829e | 407 | list_for_each_entry(task, &cmd->t_task_list, t_list) { |
6c76bf95 | 408 | if (task->task_flags & TF_ACTIVE) |
c66ac9db NB |
409 | continue; |
410 | ||
c66ac9db | 411 | spin_lock_irqsave(&dev->execute_task_lock, flags); |
1880807a CH |
412 | if (task->t_state_active) { |
413 | pr_debug("Removed ITT: 0x%08x dev: %p task[%p]\n", | |
414 | cmd->se_tfo->get_task_tag(cmd), dev, task); | |
c66ac9db | 415 | |
1880807a CH |
416 | list_del(&task->t_state_list); |
417 | atomic_dec(&cmd->t_task_cdbs_ex_left); | |
418 | task->t_state_active = false; | |
419 | } | |
420 | spin_unlock_irqrestore(&dev->execute_task_lock, flags); | |
c66ac9db | 421 | } |
1880807a | 422 | |
c66ac9db NB |
423 | } |
424 | ||
425 | /* transport_cmd_check_stop(): | |
426 | * | |
7d680f3b | 427 | * 'transport_off = 1' determines if CMD_T_ACTIVE should be cleared. |
c66ac9db NB |
428 | * 'transport_off = 2' determines if task_dev_state should be removed. |
429 | * | |
430 | * A non-zero u8 t_state sets cmd->t_state. | |
431 | * Returns 1 when command is stopped, else 0. | |
432 | */ | |
433 | static int transport_cmd_check_stop( | |
434 | struct se_cmd *cmd, | |
435 | int transport_off, | |
436 | u8 t_state) | |
437 | { | |
438 | unsigned long flags; | |
439 | ||
a1d8b49a | 440 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db NB |
441 | /* |
442 | * Determine if IOCTL context caller in requesting the stopping of this | |
443 | * command for LUN shutdown purposes. | |
444 | */ | |
7d680f3b CH |
445 | if (cmd->transport_state & CMD_T_LUN_STOP) { |
446 | pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n", | |
447 | __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd)); | |
c66ac9db | 448 | |
7d680f3b | 449 | cmd->transport_state &= ~CMD_T_ACTIVE; |
c66ac9db NB |
450 | if (transport_off == 2) |
451 | transport_all_task_dev_remove_state(cmd); | |
a1d8b49a | 452 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 453 | |
a1d8b49a | 454 | complete(&cmd->transport_lun_stop_comp); |
c66ac9db NB |
455 | return 1; |
456 | } | |
457 | /* | |
458 | * Determine if frontend context caller is requesting the stopping of | |
e3d6f909 | 459 | * this command for frontend exceptions. |
c66ac9db | 460 | */ |
7d680f3b CH |
461 | if (cmd->transport_state & CMD_T_STOP) { |
462 | pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n", | |
463 | __func__, __LINE__, | |
e3d6f909 | 464 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 465 | |
c66ac9db NB |
466 | if (transport_off == 2) |
467 | transport_all_task_dev_remove_state(cmd); | |
468 | ||
469 | /* | |
470 | * Clear struct se_cmd->se_lun before the transport_off == 2 handoff | |
471 | * to FE. | |
472 | */ | |
473 | if (transport_off == 2) | |
474 | cmd->se_lun = NULL; | |
a1d8b49a | 475 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 476 | |
a1d8b49a | 477 | complete(&cmd->t_transport_stop_comp); |
c66ac9db NB |
478 | return 1; |
479 | } | |
480 | if (transport_off) { | |
7d680f3b | 481 | cmd->transport_state &= ~CMD_T_ACTIVE; |
c66ac9db NB |
482 | if (transport_off == 2) { |
483 | transport_all_task_dev_remove_state(cmd); | |
484 | /* | |
485 | * Clear struct se_cmd->se_lun before the transport_off == 2 | |
486 | * handoff to fabric module. | |
487 | */ | |
488 | cmd->se_lun = NULL; | |
489 | /* | |
490 | * Some fabric modules like tcm_loop can release | |
25985edc | 491 | * their internally allocated I/O reference now and |
c66ac9db | 492 | * struct se_cmd now. |
88dd9e26 NB |
493 | * |
494 | * Fabric modules are expected to return '1' here if the | |
495 | * se_cmd being passed is released at this point, | |
496 | * or zero if not being released. | |
c66ac9db | 497 | */ |
e3d6f909 | 498 | if (cmd->se_tfo->check_stop_free != NULL) { |
c66ac9db | 499 | spin_unlock_irqrestore( |
a1d8b49a | 500 | &cmd->t_state_lock, flags); |
c66ac9db | 501 | |
88dd9e26 | 502 | return cmd->se_tfo->check_stop_free(cmd); |
c66ac9db NB |
503 | } |
504 | } | |
a1d8b49a | 505 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
506 | |
507 | return 0; | |
508 | } else if (t_state) | |
509 | cmd->t_state = t_state; | |
a1d8b49a | 510 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
511 | |
512 | return 0; | |
513 | } | |
514 | ||
515 | static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd) | |
516 | { | |
517 | return transport_cmd_check_stop(cmd, 2, 0); | |
518 | } | |
519 | ||
520 | static void transport_lun_remove_cmd(struct se_cmd *cmd) | |
521 | { | |
e3d6f909 | 522 | struct se_lun *lun = cmd->se_lun; |
c66ac9db NB |
523 | unsigned long flags; |
524 | ||
525 | if (!lun) | |
526 | return; | |
527 | ||
a1d8b49a | 528 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
7d680f3b CH |
529 | if (cmd->transport_state & CMD_T_DEV_ACTIVE) { |
530 | cmd->transport_state &= ~CMD_T_DEV_ACTIVE; | |
531 | transport_all_task_dev_remove_state(cmd); | |
c66ac9db | 532 | } |
a1d8b49a | 533 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 534 | |
c66ac9db | 535 | spin_lock_irqsave(&lun->lun_cmd_lock, flags); |
3d26fea0 CH |
536 | if (!list_empty(&cmd->se_lun_node)) |
537 | list_del_init(&cmd->se_lun_node); | |
c66ac9db NB |
538 | spin_unlock_irqrestore(&lun->lun_cmd_lock, flags); |
539 | } | |
540 | ||
541 | void transport_cmd_finish_abort(struct se_cmd *cmd, int remove) | |
542 | { | |
c8e31f26 | 543 | if (!(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) |
8dc52b54 | 544 | transport_lun_remove_cmd(cmd); |
c66ac9db NB |
545 | |
546 | if (transport_cmd_check_stop_to_fabric(cmd)) | |
547 | return; | |
77039d1e | 548 | if (remove) { |
3df8d40b | 549 | transport_remove_cmd_from_queue(cmd); |
e6a2573f | 550 | transport_put_cmd(cmd); |
77039d1e | 551 | } |
c66ac9db NB |
552 | } |
553 | ||
f7a5cc0b CH |
554 | static void transport_add_cmd_to_queue(struct se_cmd *cmd, int t_state, |
555 | bool at_head) | |
c66ac9db NB |
556 | { |
557 | struct se_device *dev = cmd->se_dev; | |
e3d6f909 | 558 | struct se_queue_obj *qobj = &dev->dev_queue_obj; |
c66ac9db NB |
559 | unsigned long flags; |
560 | ||
c66ac9db | 561 | if (t_state) { |
a1d8b49a | 562 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 563 | cmd->t_state = t_state; |
7d680f3b | 564 | cmd->transport_state |= CMD_T_ACTIVE; |
a1d8b49a | 565 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
566 | } |
567 | ||
568 | spin_lock_irqsave(&qobj->cmd_queue_lock, flags); | |
79a7fef2 RD |
569 | |
570 | /* If the cmd is already on the list, remove it before we add it */ | |
571 | if (!list_empty(&cmd->se_queue_node)) | |
572 | list_del(&cmd->se_queue_node); | |
573 | else | |
574 | atomic_inc(&qobj->queue_cnt); | |
575 | ||
f7a5cc0b | 576 | if (at_head) |
07bde79a | 577 | list_add(&cmd->se_queue_node, &qobj->qobj_list); |
f7a5cc0b | 578 | else |
07bde79a | 579 | list_add_tail(&cmd->se_queue_node, &qobj->qobj_list); |
7d680f3b | 580 | cmd->transport_state |= CMD_T_QUEUED; |
c66ac9db NB |
581 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); |
582 | ||
c66ac9db | 583 | wake_up_interruptible(&qobj->thread_wq); |
c66ac9db NB |
584 | } |
585 | ||
5951146d AG |
586 | static struct se_cmd * |
587 | transport_get_cmd_from_queue(struct se_queue_obj *qobj) | |
c66ac9db | 588 | { |
5951146d | 589 | struct se_cmd *cmd; |
c66ac9db NB |
590 | unsigned long flags; |
591 | ||
592 | spin_lock_irqsave(&qobj->cmd_queue_lock, flags); | |
593 | if (list_empty(&qobj->qobj_list)) { | |
594 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); | |
595 | return NULL; | |
596 | } | |
5951146d | 597 | cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node); |
c66ac9db | 598 | |
7d680f3b | 599 | cmd->transport_state &= ~CMD_T_QUEUED; |
79a7fef2 | 600 | list_del_init(&cmd->se_queue_node); |
c66ac9db NB |
601 | atomic_dec(&qobj->queue_cnt); |
602 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); | |
603 | ||
5951146d | 604 | return cmd; |
c66ac9db NB |
605 | } |
606 | ||
3df8d40b | 607 | static void transport_remove_cmd_from_queue(struct se_cmd *cmd) |
c66ac9db | 608 | { |
3df8d40b | 609 | struct se_queue_obj *qobj = &cmd->se_dev->dev_queue_obj; |
c66ac9db NB |
610 | unsigned long flags; |
611 | ||
612 | spin_lock_irqsave(&qobj->cmd_queue_lock, flags); | |
7d680f3b | 613 | if (!(cmd->transport_state & CMD_T_QUEUED)) { |
c66ac9db NB |
614 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); |
615 | return; | |
616 | } | |
7d680f3b | 617 | cmd->transport_state &= ~CMD_T_QUEUED; |
79a7fef2 RD |
618 | atomic_dec(&qobj->queue_cnt); |
619 | list_del_init(&cmd->se_queue_node); | |
c66ac9db | 620 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); |
c66ac9db NB |
621 | } |
622 | ||
623 | /* | |
624 | * Completion function used by TCM subsystem plugins (such as FILEIO) | |
625 | * for queueing up response from struct se_subsystem_api->do_task() | |
626 | */ | |
627 | void transport_complete_sync_cache(struct se_cmd *cmd, int good) | |
628 | { | |
a1d8b49a | 629 | struct se_task *task = list_entry(cmd->t_task_list.next, |
c66ac9db NB |
630 | struct se_task, t_list); |
631 | ||
632 | if (good) { | |
633 | cmd->scsi_status = SAM_STAT_GOOD; | |
634 | task->task_scsi_status = GOOD; | |
635 | } else { | |
636 | task->task_scsi_status = SAM_STAT_CHECK_CONDITION; | |
03e98c9e NB |
637 | task->task_se_cmd->scsi_sense_reason = |
638 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
639 | ||
c66ac9db NB |
640 | } |
641 | ||
642 | transport_complete_task(task, good); | |
643 | } | |
644 | EXPORT_SYMBOL(transport_complete_sync_cache); | |
645 | ||
35e0e757 CH |
646 | static void target_complete_failure_work(struct work_struct *work) |
647 | { | |
648 | struct se_cmd *cmd = container_of(work, struct se_cmd, work); | |
649 | ||
03e98c9e | 650 | transport_generic_request_failure(cmd); |
35e0e757 CH |
651 | } |
652 | ||
c66ac9db NB |
653 | /* transport_complete_task(): |
654 | * | |
655 | * Called from interrupt and non interrupt context depending | |
656 | * on the transport plugin. | |
657 | */ | |
658 | void transport_complete_task(struct se_task *task, int success) | |
659 | { | |
e3d6f909 | 660 | struct se_cmd *cmd = task->task_se_cmd; |
42bf829e | 661 | struct se_device *dev = cmd->se_dev; |
c66ac9db | 662 | unsigned long flags; |
c66ac9db | 663 | |
a1d8b49a | 664 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
6c76bf95 | 665 | task->task_flags &= ~TF_ACTIVE; |
c66ac9db NB |
666 | |
667 | /* | |
668 | * See if any sense data exists, if so set the TASK_SENSE flag. | |
669 | * Also check for any other post completion work that needs to be | |
670 | * done by the plugins. | |
671 | */ | |
672 | if (dev && dev->transport->transport_complete) { | |
673 | if (dev->transport->transport_complete(task) != 0) { | |
674 | cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE; | |
ef804a84 | 675 | task->task_flags |= TF_HAS_SENSE; |
c66ac9db NB |
676 | success = 1; |
677 | } | |
678 | } | |
679 | ||
680 | /* | |
681 | * See if we are waiting for outstanding struct se_task | |
682 | * to complete for an exception condition | |
683 | */ | |
6c76bf95 | 684 | if (task->task_flags & TF_REQUEST_STOP) { |
a1d8b49a | 685 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
686 | complete(&task->task_stop_comp); |
687 | return; | |
688 | } | |
2235007c CH |
689 | |
690 | if (!success) | |
7d680f3b | 691 | cmd->transport_state |= CMD_T_FAILED; |
2235007c | 692 | |
c66ac9db NB |
693 | /* |
694 | * Decrement the outstanding t_task_cdbs_left count. The last | |
695 | * struct se_task from struct se_cmd will complete itself into the | |
696 | * device queue depending upon int success. | |
697 | */ | |
6708bb27 | 698 | if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) { |
a1d8b49a | 699 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
700 | return; |
701 | } | |
702 | ||
7d680f3b | 703 | if (cmd->transport_state & CMD_T_FAILED) { |
41e16e98 | 704 | cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
35e0e757 | 705 | INIT_WORK(&cmd->work, target_complete_failure_work); |
c66ac9db | 706 | } else { |
7d680f3b | 707 | cmd->transport_state |= CMD_T_COMPLETE; |
35e0e757 | 708 | INIT_WORK(&cmd->work, target_complete_ok_work); |
c66ac9db | 709 | } |
35e0e757 | 710 | |
35e0e757 | 711 | cmd->t_state = TRANSPORT_COMPLETE; |
7d680f3b | 712 | cmd->transport_state |= CMD_T_ACTIVE; |
a1d8b49a | 713 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 714 | |
35e0e757 | 715 | queue_work(target_completion_wq, &cmd->work); |
c66ac9db NB |
716 | } |
717 | EXPORT_SYMBOL(transport_complete_task); | |
718 | ||
719 | /* | |
720 | * Called by transport_add_tasks_from_cmd() once a struct se_cmd's | |
721 | * struct se_task list are ready to be added to the active execution list | |
722 | * struct se_device | |
723 | ||
724 | * Called with se_dev_t->execute_task_lock called. | |
725 | */ | |
726 | static inline int transport_add_task_check_sam_attr( | |
727 | struct se_task *task, | |
728 | struct se_task *task_prev, | |
729 | struct se_device *dev) | |
730 | { | |
731 | /* | |
732 | * No SAM Task attribute emulation enabled, add to tail of | |
733 | * execution queue | |
734 | */ | |
735 | if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) { | |
736 | list_add_tail(&task->t_execute_list, &dev->execute_task_list); | |
737 | return 0; | |
738 | } | |
739 | /* | |
740 | * HEAD_OF_QUEUE attribute for received CDB, which means | |
741 | * the first task that is associated with a struct se_cmd goes to | |
742 | * head of the struct se_device->execute_task_list, and task_prev | |
743 | * after that for each subsequent task | |
744 | */ | |
e66ecd50 | 745 | if (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG) { |
c66ac9db NB |
746 | list_add(&task->t_execute_list, |
747 | (task_prev != NULL) ? | |
748 | &task_prev->t_execute_list : | |
749 | &dev->execute_task_list); | |
750 | ||
6708bb27 | 751 | pr_debug("Set HEAD_OF_QUEUE for task CDB: 0x%02x" |
c66ac9db | 752 | " in execution queue\n", |
6708bb27 | 753 | task->task_se_cmd->t_task_cdb[0]); |
c66ac9db NB |
754 | return 1; |
755 | } | |
756 | /* | |
757 | * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been | |
758 | * transitioned from Dermant -> Active state, and are added to the end | |
759 | * of the struct se_device->execute_task_list | |
760 | */ | |
761 | list_add_tail(&task->t_execute_list, &dev->execute_task_list); | |
762 | return 0; | |
763 | } | |
764 | ||
765 | /* __transport_add_task_to_execute_queue(): | |
766 | * | |
767 | * Called with se_dev_t->execute_task_lock called. | |
768 | */ | |
769 | static void __transport_add_task_to_execute_queue( | |
770 | struct se_task *task, | |
771 | struct se_task *task_prev, | |
772 | struct se_device *dev) | |
773 | { | |
774 | int head_of_queue; | |
775 | ||
776 | head_of_queue = transport_add_task_check_sam_attr(task, task_prev, dev); | |
777 | atomic_inc(&dev->execute_tasks); | |
778 | ||
1880807a | 779 | if (task->t_state_active) |
c66ac9db NB |
780 | return; |
781 | /* | |
782 | * Determine if this task needs to go to HEAD_OF_QUEUE for the | |
783 | * state list as well. Running with SAM Task Attribute emulation | |
784 | * will always return head_of_queue == 0 here | |
785 | */ | |
786 | if (head_of_queue) | |
787 | list_add(&task->t_state_list, (task_prev) ? | |
788 | &task_prev->t_state_list : | |
789 | &dev->state_task_list); | |
790 | else | |
791 | list_add_tail(&task->t_state_list, &dev->state_task_list); | |
792 | ||
1880807a | 793 | task->t_state_active = true; |
c66ac9db | 794 | |
6708bb27 | 795 | pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n", |
e3d6f909 | 796 | task->task_se_cmd->se_tfo->get_task_tag(task->task_se_cmd), |
c66ac9db NB |
797 | task, dev); |
798 | } | |
799 | ||
800 | static void transport_add_tasks_to_state_queue(struct se_cmd *cmd) | |
801 | { | |
42bf829e | 802 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
803 | struct se_task *task; |
804 | unsigned long flags; | |
805 | ||
a1d8b49a AG |
806 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
807 | list_for_each_entry(task, &cmd->t_task_list, t_list) { | |
c66ac9db | 808 | spin_lock(&dev->execute_task_lock); |
1880807a CH |
809 | if (!task->t_state_active) { |
810 | list_add_tail(&task->t_state_list, | |
811 | &dev->state_task_list); | |
812 | task->t_state_active = true; | |
813 | ||
814 | pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n", | |
815 | task->task_se_cmd->se_tfo->get_task_tag( | |
816 | task->task_se_cmd), task, dev); | |
817 | } | |
c66ac9db NB |
818 | spin_unlock(&dev->execute_task_lock); |
819 | } | |
a1d8b49a | 820 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
821 | } |
822 | ||
4d2300cc | 823 | static void __transport_add_tasks_from_cmd(struct se_cmd *cmd) |
c66ac9db | 824 | { |
5951146d | 825 | struct se_device *dev = cmd->se_dev; |
c66ac9db | 826 | struct se_task *task, *task_prev = NULL; |
c66ac9db | 827 | |
a1d8b49a | 828 | list_for_each_entry(task, &cmd->t_task_list, t_list) { |
04629b7b | 829 | if (!list_empty(&task->t_execute_list)) |
c66ac9db NB |
830 | continue; |
831 | /* | |
832 | * __transport_add_task_to_execute_queue() handles the | |
833 | * SAM Task Attribute emulation if enabled | |
834 | */ | |
835 | __transport_add_task_to_execute_queue(task, task_prev, dev); | |
c66ac9db NB |
836 | task_prev = task; |
837 | } | |
4d2300cc NB |
838 | } |
839 | ||
840 | static void transport_add_tasks_from_cmd(struct se_cmd *cmd) | |
841 | { | |
842 | unsigned long flags; | |
843 | struct se_device *dev = cmd->se_dev; | |
844 | ||
845 | spin_lock_irqsave(&dev->execute_task_lock, flags); | |
846 | __transport_add_tasks_from_cmd(cmd); | |
c66ac9db | 847 | spin_unlock_irqrestore(&dev->execute_task_lock, flags); |
c66ac9db NB |
848 | } |
849 | ||
04629b7b CH |
850 | void __transport_remove_task_from_execute_queue(struct se_task *task, |
851 | struct se_device *dev) | |
852 | { | |
853 | list_del_init(&task->t_execute_list); | |
854 | atomic_dec(&dev->execute_tasks); | |
855 | } | |
856 | ||
e26d99ae | 857 | static void transport_remove_task_from_execute_queue( |
c66ac9db NB |
858 | struct se_task *task, |
859 | struct se_device *dev) | |
860 | { | |
861 | unsigned long flags; | |
862 | ||
04629b7b | 863 | if (WARN_ON(list_empty(&task->t_execute_list))) |
af57c3ac | 864 | return; |
af57c3ac | 865 | |
c66ac9db | 866 | spin_lock_irqsave(&dev->execute_task_lock, flags); |
04629b7b | 867 | __transport_remove_task_from_execute_queue(task, dev); |
c66ac9db NB |
868 | spin_unlock_irqrestore(&dev->execute_task_lock, flags); |
869 | } | |
870 | ||
07bde79a | 871 | /* |
f147abb4 | 872 | * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status |
07bde79a NB |
873 | */ |
874 | ||
875 | static void target_qf_do_work(struct work_struct *work) | |
876 | { | |
877 | struct se_device *dev = container_of(work, struct se_device, | |
878 | qf_work_queue); | |
bcac364a | 879 | LIST_HEAD(qf_cmd_list); |
07bde79a NB |
880 | struct se_cmd *cmd, *cmd_tmp; |
881 | ||
882 | spin_lock_irq(&dev->qf_cmd_lock); | |
bcac364a RD |
883 | list_splice_init(&dev->qf_cmd_list, &qf_cmd_list); |
884 | spin_unlock_irq(&dev->qf_cmd_lock); | |
07bde79a | 885 | |
bcac364a | 886 | list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) { |
07bde79a NB |
887 | list_del(&cmd->se_qf_node); |
888 | atomic_dec(&dev->dev_qf_count); | |
889 | smp_mb__after_atomic_dec(); | |
07bde79a | 890 | |
6708bb27 | 891 | pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue" |
07bde79a | 892 | " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd, |
e057f533 | 893 | (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" : |
07bde79a NB |
894 | (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING" |
895 | : "UNKNOWN"); | |
f7a5cc0b CH |
896 | |
897 | transport_add_cmd_to_queue(cmd, cmd->t_state, true); | |
07bde79a | 898 | } |
07bde79a NB |
899 | } |
900 | ||
c66ac9db NB |
901 | unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd) |
902 | { | |
903 | switch (cmd->data_direction) { | |
904 | case DMA_NONE: | |
905 | return "NONE"; | |
906 | case DMA_FROM_DEVICE: | |
907 | return "READ"; | |
908 | case DMA_TO_DEVICE: | |
909 | return "WRITE"; | |
910 | case DMA_BIDIRECTIONAL: | |
911 | return "BIDI"; | |
912 | default: | |
913 | break; | |
914 | } | |
915 | ||
916 | return "UNKNOWN"; | |
917 | } | |
918 | ||
919 | void transport_dump_dev_state( | |
920 | struct se_device *dev, | |
921 | char *b, | |
922 | int *bl) | |
923 | { | |
924 | *bl += sprintf(b + *bl, "Status: "); | |
925 | switch (dev->dev_status) { | |
926 | case TRANSPORT_DEVICE_ACTIVATED: | |
927 | *bl += sprintf(b + *bl, "ACTIVATED"); | |
928 | break; | |
929 | case TRANSPORT_DEVICE_DEACTIVATED: | |
930 | *bl += sprintf(b + *bl, "DEACTIVATED"); | |
931 | break; | |
932 | case TRANSPORT_DEVICE_SHUTDOWN: | |
933 | *bl += sprintf(b + *bl, "SHUTDOWN"); | |
934 | break; | |
935 | case TRANSPORT_DEVICE_OFFLINE_ACTIVATED: | |
936 | case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED: | |
937 | *bl += sprintf(b + *bl, "OFFLINE"); | |
938 | break; | |
939 | default: | |
940 | *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status); | |
941 | break; | |
942 | } | |
943 | ||
65586d51 NB |
944 | *bl += sprintf(b + *bl, " Execute/Max Queue Depth: %d/%d", |
945 | atomic_read(&dev->execute_tasks), dev->queue_depth); | |
c66ac9db | 946 | *bl += sprintf(b + *bl, " SectorSize: %u MaxSectors: %u\n", |
e3d6f909 | 947 | dev->se_sub_dev->se_dev_attrib.block_size, dev->se_sub_dev->se_dev_attrib.max_sectors); |
c66ac9db NB |
948 | *bl += sprintf(b + *bl, " "); |
949 | } | |
950 | ||
c66ac9db NB |
951 | void transport_dump_vpd_proto_id( |
952 | struct t10_vpd *vpd, | |
953 | unsigned char *p_buf, | |
954 | int p_buf_len) | |
955 | { | |
956 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
957 | int len; | |
958 | ||
959 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
960 | len = sprintf(buf, "T10 VPD Protocol Identifier: "); | |
961 | ||
962 | switch (vpd->protocol_identifier) { | |
963 | case 0x00: | |
964 | sprintf(buf+len, "Fibre Channel\n"); | |
965 | break; | |
966 | case 0x10: | |
967 | sprintf(buf+len, "Parallel SCSI\n"); | |
968 | break; | |
969 | case 0x20: | |
970 | sprintf(buf+len, "SSA\n"); | |
971 | break; | |
972 | case 0x30: | |
973 | sprintf(buf+len, "IEEE 1394\n"); | |
974 | break; | |
975 | case 0x40: | |
976 | sprintf(buf+len, "SCSI Remote Direct Memory Access" | |
977 | " Protocol\n"); | |
978 | break; | |
979 | case 0x50: | |
980 | sprintf(buf+len, "Internet SCSI (iSCSI)\n"); | |
981 | break; | |
982 | case 0x60: | |
983 | sprintf(buf+len, "SAS Serial SCSI Protocol\n"); | |
984 | break; | |
985 | case 0x70: | |
986 | sprintf(buf+len, "Automation/Drive Interface Transport" | |
987 | " Protocol\n"); | |
988 | break; | |
989 | case 0x80: | |
990 | sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n"); | |
991 | break; | |
992 | default: | |
993 | sprintf(buf+len, "Unknown 0x%02x\n", | |
994 | vpd->protocol_identifier); | |
995 | break; | |
996 | } | |
997 | ||
998 | if (p_buf) | |
999 | strncpy(p_buf, buf, p_buf_len); | |
1000 | else | |
6708bb27 | 1001 | pr_debug("%s", buf); |
c66ac9db NB |
1002 | } |
1003 | ||
1004 | void | |
1005 | transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83) | |
1006 | { | |
1007 | /* | |
1008 | * Check if the Protocol Identifier Valid (PIV) bit is set.. | |
1009 | * | |
1010 | * from spc3r23.pdf section 7.5.1 | |
1011 | */ | |
1012 | if (page_83[1] & 0x80) { | |
1013 | vpd->protocol_identifier = (page_83[0] & 0xf0); | |
1014 | vpd->protocol_identifier_set = 1; | |
1015 | transport_dump_vpd_proto_id(vpd, NULL, 0); | |
1016 | } | |
1017 | } | |
1018 | EXPORT_SYMBOL(transport_set_vpd_proto_id); | |
1019 | ||
1020 | int transport_dump_vpd_assoc( | |
1021 | struct t10_vpd *vpd, | |
1022 | unsigned char *p_buf, | |
1023 | int p_buf_len) | |
1024 | { | |
1025 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
e3d6f909 AG |
1026 | int ret = 0; |
1027 | int len; | |
c66ac9db NB |
1028 | |
1029 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
1030 | len = sprintf(buf, "T10 VPD Identifier Association: "); | |
1031 | ||
1032 | switch (vpd->association) { | |
1033 | case 0x00: | |
1034 | sprintf(buf+len, "addressed logical unit\n"); | |
1035 | break; | |
1036 | case 0x10: | |
1037 | sprintf(buf+len, "target port\n"); | |
1038 | break; | |
1039 | case 0x20: | |
1040 | sprintf(buf+len, "SCSI target device\n"); | |
1041 | break; | |
1042 | default: | |
1043 | sprintf(buf+len, "Unknown 0x%02x\n", vpd->association); | |
e3d6f909 | 1044 | ret = -EINVAL; |
c66ac9db NB |
1045 | break; |
1046 | } | |
1047 | ||
1048 | if (p_buf) | |
1049 | strncpy(p_buf, buf, p_buf_len); | |
1050 | else | |
6708bb27 | 1051 | pr_debug("%s", buf); |
c66ac9db NB |
1052 | |
1053 | return ret; | |
1054 | } | |
1055 | ||
1056 | int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83) | |
1057 | { | |
1058 | /* | |
1059 | * The VPD identification association.. | |
1060 | * | |
1061 | * from spc3r23.pdf Section 7.6.3.1 Table 297 | |
1062 | */ | |
1063 | vpd->association = (page_83[1] & 0x30); | |
1064 | return transport_dump_vpd_assoc(vpd, NULL, 0); | |
1065 | } | |
1066 | EXPORT_SYMBOL(transport_set_vpd_assoc); | |
1067 | ||
1068 | int transport_dump_vpd_ident_type( | |
1069 | struct t10_vpd *vpd, | |
1070 | unsigned char *p_buf, | |
1071 | int p_buf_len) | |
1072 | { | |
1073 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
e3d6f909 AG |
1074 | int ret = 0; |
1075 | int len; | |
c66ac9db NB |
1076 | |
1077 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
1078 | len = sprintf(buf, "T10 VPD Identifier Type: "); | |
1079 | ||
1080 | switch (vpd->device_identifier_type) { | |
1081 | case 0x00: | |
1082 | sprintf(buf+len, "Vendor specific\n"); | |
1083 | break; | |
1084 | case 0x01: | |
1085 | sprintf(buf+len, "T10 Vendor ID based\n"); | |
1086 | break; | |
1087 | case 0x02: | |
1088 | sprintf(buf+len, "EUI-64 based\n"); | |
1089 | break; | |
1090 | case 0x03: | |
1091 | sprintf(buf+len, "NAA\n"); | |
1092 | break; | |
1093 | case 0x04: | |
1094 | sprintf(buf+len, "Relative target port identifier\n"); | |
1095 | break; | |
1096 | case 0x08: | |
1097 | sprintf(buf+len, "SCSI name string\n"); | |
1098 | break; | |
1099 | default: | |
1100 | sprintf(buf+len, "Unsupported: 0x%02x\n", | |
1101 | vpd->device_identifier_type); | |
e3d6f909 | 1102 | ret = -EINVAL; |
c66ac9db NB |
1103 | break; |
1104 | } | |
1105 | ||
e3d6f909 AG |
1106 | if (p_buf) { |
1107 | if (p_buf_len < strlen(buf)+1) | |
1108 | return -EINVAL; | |
c66ac9db | 1109 | strncpy(p_buf, buf, p_buf_len); |
e3d6f909 | 1110 | } else { |
6708bb27 | 1111 | pr_debug("%s", buf); |
e3d6f909 | 1112 | } |
c66ac9db NB |
1113 | |
1114 | return ret; | |
1115 | } | |
1116 | ||
1117 | int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83) | |
1118 | { | |
1119 | /* | |
1120 | * The VPD identifier type.. | |
1121 | * | |
1122 | * from spc3r23.pdf Section 7.6.3.1 Table 298 | |
1123 | */ | |
1124 | vpd->device_identifier_type = (page_83[1] & 0x0f); | |
1125 | return transport_dump_vpd_ident_type(vpd, NULL, 0); | |
1126 | } | |
1127 | EXPORT_SYMBOL(transport_set_vpd_ident_type); | |
1128 | ||
1129 | int transport_dump_vpd_ident( | |
1130 | struct t10_vpd *vpd, | |
1131 | unsigned char *p_buf, | |
1132 | int p_buf_len) | |
1133 | { | |
1134 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
1135 | int ret = 0; | |
1136 | ||
1137 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
1138 | ||
1139 | switch (vpd->device_identifier_code_set) { | |
1140 | case 0x01: /* Binary */ | |
1141 | sprintf(buf, "T10 VPD Binary Device Identifier: %s\n", | |
1142 | &vpd->device_identifier[0]); | |
1143 | break; | |
1144 | case 0x02: /* ASCII */ | |
1145 | sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n", | |
1146 | &vpd->device_identifier[0]); | |
1147 | break; | |
1148 | case 0x03: /* UTF-8 */ | |
1149 | sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n", | |
1150 | &vpd->device_identifier[0]); | |
1151 | break; | |
1152 | default: | |
1153 | sprintf(buf, "T10 VPD Device Identifier encoding unsupported:" | |
1154 | " 0x%02x", vpd->device_identifier_code_set); | |
e3d6f909 | 1155 | ret = -EINVAL; |
c66ac9db NB |
1156 | break; |
1157 | } | |
1158 | ||
1159 | if (p_buf) | |
1160 | strncpy(p_buf, buf, p_buf_len); | |
1161 | else | |
6708bb27 | 1162 | pr_debug("%s", buf); |
c66ac9db NB |
1163 | |
1164 | return ret; | |
1165 | } | |
1166 | ||
1167 | int | |
1168 | transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83) | |
1169 | { | |
1170 | static const char hex_str[] = "0123456789abcdef"; | |
1171 | int j = 0, i = 4; /* offset to start of the identifer */ | |
1172 | ||
1173 | /* | |
1174 | * The VPD Code Set (encoding) | |
1175 | * | |
1176 | * from spc3r23.pdf Section 7.6.3.1 Table 296 | |
1177 | */ | |
1178 | vpd->device_identifier_code_set = (page_83[0] & 0x0f); | |
1179 | switch (vpd->device_identifier_code_set) { | |
1180 | case 0x01: /* Binary */ | |
1181 | vpd->device_identifier[j++] = | |
1182 | hex_str[vpd->device_identifier_type]; | |
1183 | while (i < (4 + page_83[3])) { | |
1184 | vpd->device_identifier[j++] = | |
1185 | hex_str[(page_83[i] & 0xf0) >> 4]; | |
1186 | vpd->device_identifier[j++] = | |
1187 | hex_str[page_83[i] & 0x0f]; | |
1188 | i++; | |
1189 | } | |
1190 | break; | |
1191 | case 0x02: /* ASCII */ | |
1192 | case 0x03: /* UTF-8 */ | |
1193 | while (i < (4 + page_83[3])) | |
1194 | vpd->device_identifier[j++] = page_83[i++]; | |
1195 | break; | |
1196 | default: | |
1197 | break; | |
1198 | } | |
1199 | ||
1200 | return transport_dump_vpd_ident(vpd, NULL, 0); | |
1201 | } | |
1202 | EXPORT_SYMBOL(transport_set_vpd_ident); | |
1203 | ||
1204 | static void core_setup_task_attr_emulation(struct se_device *dev) | |
1205 | { | |
1206 | /* | |
1207 | * If this device is from Target_Core_Mod/pSCSI, disable the | |
1208 | * SAM Task Attribute emulation. | |
1209 | * | |
1210 | * This is currently not available in upsream Linux/SCSI Target | |
1211 | * mode code, and is assumed to be disabled while using TCM/pSCSI. | |
1212 | */ | |
e3d6f909 | 1213 | if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) { |
c66ac9db NB |
1214 | dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH; |
1215 | return; | |
1216 | } | |
1217 | ||
1218 | dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED; | |
6708bb27 | 1219 | pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x" |
e3d6f909 AG |
1220 | " device\n", dev->transport->name, |
1221 | dev->transport->get_device_rev(dev)); | |
c66ac9db NB |
1222 | } |
1223 | ||
1224 | static void scsi_dump_inquiry(struct se_device *dev) | |
1225 | { | |
e3d6f909 | 1226 | struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn; |
e59a41b6 | 1227 | char buf[17]; |
c66ac9db NB |
1228 | int i, device_type; |
1229 | /* | |
1230 | * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer | |
1231 | */ | |
c66ac9db NB |
1232 | for (i = 0; i < 8; i++) |
1233 | if (wwn->vendor[i] >= 0x20) | |
e59a41b6 | 1234 | buf[i] = wwn->vendor[i]; |
c66ac9db | 1235 | else |
e59a41b6 SAS |
1236 | buf[i] = ' '; |
1237 | buf[i] = '\0'; | |
1238 | pr_debug(" Vendor: %s\n", buf); | |
c66ac9db | 1239 | |
c66ac9db NB |
1240 | for (i = 0; i < 16; i++) |
1241 | if (wwn->model[i] >= 0x20) | |
e59a41b6 | 1242 | buf[i] = wwn->model[i]; |
c66ac9db | 1243 | else |
e59a41b6 SAS |
1244 | buf[i] = ' '; |
1245 | buf[i] = '\0'; | |
1246 | pr_debug(" Model: %s\n", buf); | |
c66ac9db | 1247 | |
c66ac9db NB |
1248 | for (i = 0; i < 4; i++) |
1249 | if (wwn->revision[i] >= 0x20) | |
e59a41b6 | 1250 | buf[i] = wwn->revision[i]; |
c66ac9db | 1251 | else |
e59a41b6 SAS |
1252 | buf[i] = ' '; |
1253 | buf[i] = '\0'; | |
1254 | pr_debug(" Revision: %s\n", buf); | |
c66ac9db | 1255 | |
e3d6f909 | 1256 | device_type = dev->transport->get_device_type(dev); |
6708bb27 AG |
1257 | pr_debug(" Type: %s ", scsi_device_type(device_type)); |
1258 | pr_debug(" ANSI SCSI revision: %02x\n", | |
e3d6f909 | 1259 | dev->transport->get_device_rev(dev)); |
c66ac9db NB |
1260 | } |
1261 | ||
1262 | struct se_device *transport_add_device_to_core_hba( | |
1263 | struct se_hba *hba, | |
1264 | struct se_subsystem_api *transport, | |
1265 | struct se_subsystem_dev *se_dev, | |
1266 | u32 device_flags, | |
1267 | void *transport_dev, | |
1268 | struct se_dev_limits *dev_limits, | |
1269 | const char *inquiry_prod, | |
1270 | const char *inquiry_rev) | |
1271 | { | |
12a18bdc | 1272 | int force_pt; |
c66ac9db NB |
1273 | struct se_device *dev; |
1274 | ||
1275 | dev = kzalloc(sizeof(struct se_device), GFP_KERNEL); | |
6708bb27 AG |
1276 | if (!dev) { |
1277 | pr_err("Unable to allocate memory for se_dev_t\n"); | |
c66ac9db NB |
1278 | return NULL; |
1279 | } | |
c66ac9db | 1280 | |
e3d6f909 | 1281 | transport_init_queue_obj(&dev->dev_queue_obj); |
c66ac9db NB |
1282 | dev->dev_flags = device_flags; |
1283 | dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED; | |
5951146d | 1284 | dev->dev_ptr = transport_dev; |
c66ac9db NB |
1285 | dev->se_hba = hba; |
1286 | dev->se_sub_dev = se_dev; | |
1287 | dev->transport = transport; | |
c66ac9db NB |
1288 | INIT_LIST_HEAD(&dev->dev_list); |
1289 | INIT_LIST_HEAD(&dev->dev_sep_list); | |
1290 | INIT_LIST_HEAD(&dev->dev_tmr_list); | |
1291 | INIT_LIST_HEAD(&dev->execute_task_list); | |
1292 | INIT_LIST_HEAD(&dev->delayed_cmd_list); | |
c66ac9db | 1293 | INIT_LIST_HEAD(&dev->state_task_list); |
07bde79a | 1294 | INIT_LIST_HEAD(&dev->qf_cmd_list); |
c66ac9db NB |
1295 | spin_lock_init(&dev->execute_task_lock); |
1296 | spin_lock_init(&dev->delayed_cmd_lock); | |
c66ac9db NB |
1297 | spin_lock_init(&dev->dev_reservation_lock); |
1298 | spin_lock_init(&dev->dev_status_lock); | |
c66ac9db NB |
1299 | spin_lock_init(&dev->se_port_lock); |
1300 | spin_lock_init(&dev->se_tmr_lock); | |
07bde79a | 1301 | spin_lock_init(&dev->qf_cmd_lock); |
c66ac9db NB |
1302 | atomic_set(&dev->dev_ordered_id, 0); |
1303 | ||
1304 | se_dev_set_default_attribs(dev, dev_limits); | |
1305 | ||
1306 | dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX); | |
1307 | dev->creation_time = get_jiffies_64(); | |
1308 | spin_lock_init(&dev->stats_lock); | |
1309 | ||
1310 | spin_lock(&hba->device_lock); | |
1311 | list_add_tail(&dev->dev_list, &hba->hba_dev_list); | |
1312 | hba->dev_count++; | |
1313 | spin_unlock(&hba->device_lock); | |
1314 | /* | |
1315 | * Setup the SAM Task Attribute emulation for struct se_device | |
1316 | */ | |
1317 | core_setup_task_attr_emulation(dev); | |
1318 | /* | |
1319 | * Force PR and ALUA passthrough emulation with internal object use. | |
1320 | */ | |
1321 | force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE); | |
1322 | /* | |
1323 | * Setup the Reservations infrastructure for struct se_device | |
1324 | */ | |
1325 | core_setup_reservations(dev, force_pt); | |
1326 | /* | |
1327 | * Setup the Asymmetric Logical Unit Assignment for struct se_device | |
1328 | */ | |
1329 | if (core_setup_alua(dev, force_pt) < 0) | |
1330 | goto out; | |
1331 | ||
1332 | /* | |
1333 | * Startup the struct se_device processing thread | |
1334 | */ | |
1335 | dev->process_thread = kthread_run(transport_processing_thread, dev, | |
e3d6f909 | 1336 | "LIO_%s", dev->transport->name); |
c66ac9db | 1337 | if (IS_ERR(dev->process_thread)) { |
6708bb27 | 1338 | pr_err("Unable to create kthread: LIO_%s\n", |
e3d6f909 | 1339 | dev->transport->name); |
c66ac9db NB |
1340 | goto out; |
1341 | } | |
07bde79a NB |
1342 | /* |
1343 | * Setup work_queue for QUEUE_FULL | |
1344 | */ | |
1345 | INIT_WORK(&dev->qf_work_queue, target_qf_do_work); | |
c66ac9db NB |
1346 | /* |
1347 | * Preload the initial INQUIRY const values if we are doing | |
1348 | * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI | |
1349 | * passthrough because this is being provided by the backend LLD. | |
1350 | * This is required so that transport_get_inquiry() copies these | |
1351 | * originals once back into DEV_T10_WWN(dev) for the virtual device | |
1352 | * setup. | |
1353 | */ | |
e3d6f909 | 1354 | if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) { |
f22c1196 | 1355 | if (!inquiry_prod || !inquiry_rev) { |
6708bb27 | 1356 | pr_err("All non TCM/pSCSI plugins require" |
c66ac9db NB |
1357 | " INQUIRY consts\n"); |
1358 | goto out; | |
1359 | } | |
1360 | ||
e3d6f909 AG |
1361 | strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8); |
1362 | strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16); | |
1363 | strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4); | |
c66ac9db NB |
1364 | } |
1365 | scsi_dump_inquiry(dev); | |
1366 | ||
12a18bdc | 1367 | return dev; |
c66ac9db | 1368 | out: |
c66ac9db NB |
1369 | kthread_stop(dev->process_thread); |
1370 | ||
1371 | spin_lock(&hba->device_lock); | |
1372 | list_del(&dev->dev_list); | |
1373 | hba->dev_count--; | |
1374 | spin_unlock(&hba->device_lock); | |
1375 | ||
1376 | se_release_vpd_for_dev(dev); | |
1377 | ||
c66ac9db NB |
1378 | kfree(dev); |
1379 | ||
1380 | return NULL; | |
1381 | } | |
1382 | EXPORT_SYMBOL(transport_add_device_to_core_hba); | |
1383 | ||
1384 | /* transport_generic_prepare_cdb(): | |
1385 | * | |
1386 | * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will | |
1387 | * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2. | |
1388 | * The point of this is since we are mapping iSCSI LUNs to | |
1389 | * SCSI Target IDs having a non-zero LUN in the CDB will throw the | |
1390 | * devices and HBAs for a loop. | |
1391 | */ | |
1392 | static inline void transport_generic_prepare_cdb( | |
1393 | unsigned char *cdb) | |
1394 | { | |
1395 | switch (cdb[0]) { | |
1396 | case READ_10: /* SBC - RDProtect */ | |
1397 | case READ_12: /* SBC - RDProtect */ | |
1398 | case READ_16: /* SBC - RDProtect */ | |
1399 | case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */ | |
1400 | case VERIFY: /* SBC - VRProtect */ | |
1401 | case VERIFY_16: /* SBC - VRProtect */ | |
1402 | case WRITE_VERIFY: /* SBC - VRProtect */ | |
1403 | case WRITE_VERIFY_12: /* SBC - VRProtect */ | |
1404 | break; | |
1405 | default: | |
1406 | cdb[1] &= 0x1f; /* clear logical unit number */ | |
1407 | break; | |
1408 | } | |
1409 | } | |
1410 | ||
1411 | static struct se_task * | |
1412 | transport_generic_get_task(struct se_cmd *cmd, | |
1413 | enum dma_data_direction data_direction) | |
1414 | { | |
1415 | struct se_task *task; | |
5951146d | 1416 | struct se_device *dev = cmd->se_dev; |
c66ac9db | 1417 | |
6708bb27 | 1418 | task = dev->transport->alloc_task(cmd->t_task_cdb); |
c66ac9db | 1419 | if (!task) { |
6708bb27 | 1420 | pr_err("Unable to allocate struct se_task\n"); |
c66ac9db NB |
1421 | return NULL; |
1422 | } | |
1423 | ||
1424 | INIT_LIST_HEAD(&task->t_list); | |
1425 | INIT_LIST_HEAD(&task->t_execute_list); | |
1426 | INIT_LIST_HEAD(&task->t_state_list); | |
1427 | init_completion(&task->task_stop_comp); | |
c66ac9db | 1428 | task->task_se_cmd = cmd; |
c66ac9db NB |
1429 | task->task_data_direction = data_direction; |
1430 | ||
c66ac9db NB |
1431 | return task; |
1432 | } | |
1433 | ||
1434 | static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *); | |
1435 | ||
c66ac9db NB |
1436 | /* |
1437 | * Used by fabric modules containing a local struct se_cmd within their | |
1438 | * fabric dependent per I/O descriptor. | |
1439 | */ | |
1440 | void transport_init_se_cmd( | |
1441 | struct se_cmd *cmd, | |
1442 | struct target_core_fabric_ops *tfo, | |
1443 | struct se_session *se_sess, | |
1444 | u32 data_length, | |
1445 | int data_direction, | |
1446 | int task_attr, | |
1447 | unsigned char *sense_buffer) | |
1448 | { | |
5951146d AG |
1449 | INIT_LIST_HEAD(&cmd->se_lun_node); |
1450 | INIT_LIST_HEAD(&cmd->se_delayed_node); | |
07bde79a | 1451 | INIT_LIST_HEAD(&cmd->se_qf_node); |
79a7fef2 | 1452 | INIT_LIST_HEAD(&cmd->se_queue_node); |
a17f091d | 1453 | INIT_LIST_HEAD(&cmd->se_cmd_list); |
a1d8b49a AG |
1454 | INIT_LIST_HEAD(&cmd->t_task_list); |
1455 | init_completion(&cmd->transport_lun_fe_stop_comp); | |
1456 | init_completion(&cmd->transport_lun_stop_comp); | |
1457 | init_completion(&cmd->t_transport_stop_comp); | |
a17f091d | 1458 | init_completion(&cmd->cmd_wait_comp); |
a1d8b49a | 1459 | spin_lock_init(&cmd->t_state_lock); |
7d680f3b | 1460 | cmd->transport_state = CMD_T_DEV_ACTIVE; |
c66ac9db NB |
1461 | |
1462 | cmd->se_tfo = tfo; | |
1463 | cmd->se_sess = se_sess; | |
1464 | cmd->data_length = data_length; | |
1465 | cmd->data_direction = data_direction; | |
1466 | cmd->sam_task_attr = task_attr; | |
1467 | cmd->sense_buffer = sense_buffer; | |
1468 | } | |
1469 | EXPORT_SYMBOL(transport_init_se_cmd); | |
1470 | ||
1471 | static int transport_check_alloc_task_attr(struct se_cmd *cmd) | |
1472 | { | |
1473 | /* | |
1474 | * Check if SAM Task Attribute emulation is enabled for this | |
1475 | * struct se_device storage object | |
1476 | */ | |
5951146d | 1477 | if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) |
c66ac9db NB |
1478 | return 0; |
1479 | ||
e66ecd50 | 1480 | if (cmd->sam_task_attr == MSG_ACA_TAG) { |
6708bb27 | 1481 | pr_debug("SAM Task Attribute ACA" |
c66ac9db | 1482 | " emulation is not supported\n"); |
e3d6f909 | 1483 | return -EINVAL; |
c66ac9db NB |
1484 | } |
1485 | /* | |
1486 | * Used to determine when ORDERED commands should go from | |
1487 | * Dormant to Active status. | |
1488 | */ | |
5951146d | 1489 | cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id); |
c66ac9db | 1490 | smp_mb__after_atomic_inc(); |
6708bb27 | 1491 | pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n", |
c66ac9db | 1492 | cmd->se_ordered_id, cmd->sam_task_attr, |
6708bb27 | 1493 | cmd->se_dev->transport->name); |
c66ac9db NB |
1494 | return 0; |
1495 | } | |
1496 | ||
c66ac9db NB |
1497 | /* transport_generic_allocate_tasks(): |
1498 | * | |
1499 | * Called from fabric RX Thread. | |
1500 | */ | |
1501 | int transport_generic_allocate_tasks( | |
1502 | struct se_cmd *cmd, | |
1503 | unsigned char *cdb) | |
1504 | { | |
1505 | int ret; | |
1506 | ||
1507 | transport_generic_prepare_cdb(cdb); | |
c66ac9db NB |
1508 | /* |
1509 | * Ensure that the received CDB is less than the max (252 + 8) bytes | |
1510 | * for VARIABLE_LENGTH_CMD | |
1511 | */ | |
1512 | if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) { | |
6708bb27 | 1513 | pr_err("Received SCSI CDB with command_size: %d that" |
c66ac9db NB |
1514 | " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n", |
1515 | scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE); | |
03e98c9e NB |
1516 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; |
1517 | cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; | |
e3d6f909 | 1518 | return -EINVAL; |
c66ac9db NB |
1519 | } |
1520 | /* | |
1521 | * If the received CDB is larger than TCM_MAX_COMMAND_SIZE, | |
1522 | * allocate the additional extended CDB buffer now.. Otherwise | |
1523 | * setup the pointer from __t_task_cdb to t_task_cdb. | |
1524 | */ | |
a1d8b49a AG |
1525 | if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) { |
1526 | cmd->t_task_cdb = kzalloc(scsi_command_size(cdb), | |
c66ac9db | 1527 | GFP_KERNEL); |
6708bb27 AG |
1528 | if (!cmd->t_task_cdb) { |
1529 | pr_err("Unable to allocate cmd->t_task_cdb" | |
a1d8b49a | 1530 | " %u > sizeof(cmd->__t_task_cdb): %lu ops\n", |
c66ac9db | 1531 | scsi_command_size(cdb), |
a1d8b49a | 1532 | (unsigned long)sizeof(cmd->__t_task_cdb)); |
03e98c9e NB |
1533 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; |
1534 | cmd->scsi_sense_reason = | |
1535 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
e3d6f909 | 1536 | return -ENOMEM; |
c66ac9db NB |
1537 | } |
1538 | } else | |
a1d8b49a | 1539 | cmd->t_task_cdb = &cmd->__t_task_cdb[0]; |
c66ac9db | 1540 | /* |
a1d8b49a | 1541 | * Copy the original CDB into cmd-> |
c66ac9db | 1542 | */ |
a1d8b49a | 1543 | memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb)); |
c66ac9db NB |
1544 | /* |
1545 | * Setup the received CDB based on SCSI defined opcodes and | |
1546 | * perform unit attention, persistent reservations and ALUA | |
a1d8b49a | 1547 | * checks for virtual device backends. The cmd->t_task_cdb |
c66ac9db NB |
1548 | * pointer is expected to be setup before we reach this point. |
1549 | */ | |
1550 | ret = transport_generic_cmd_sequencer(cmd, cdb); | |
1551 | if (ret < 0) | |
1552 | return ret; | |
1553 | /* | |
1554 | * Check for SAM Task Attribute Emulation | |
1555 | */ | |
1556 | if (transport_check_alloc_task_attr(cmd) < 0) { | |
1557 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
1558 | cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; | |
5951146d | 1559 | return -EINVAL; |
c66ac9db NB |
1560 | } |
1561 | spin_lock(&cmd->se_lun->lun_sep_lock); | |
1562 | if (cmd->se_lun->lun_sep) | |
1563 | cmd->se_lun->lun_sep->sep_stats.cmd_pdus++; | |
1564 | spin_unlock(&cmd->se_lun->lun_sep_lock); | |
1565 | return 0; | |
1566 | } | |
1567 | EXPORT_SYMBOL(transport_generic_allocate_tasks); | |
1568 | ||
695434e1 NB |
1569 | /* |
1570 | * Used by fabric module frontends to queue tasks directly. | |
1571 | * Many only be used from process context only | |
1572 | */ | |
1573 | int transport_handle_cdb_direct( | |
1574 | struct se_cmd *cmd) | |
1575 | { | |
dd8ae59d NB |
1576 | int ret; |
1577 | ||
695434e1 NB |
1578 | if (!cmd->se_lun) { |
1579 | dump_stack(); | |
6708bb27 | 1580 | pr_err("cmd->se_lun is NULL\n"); |
695434e1 NB |
1581 | return -EINVAL; |
1582 | } | |
1583 | if (in_interrupt()) { | |
1584 | dump_stack(); | |
6708bb27 | 1585 | pr_err("transport_generic_handle_cdb cannot be called" |
695434e1 NB |
1586 | " from interrupt context\n"); |
1587 | return -EINVAL; | |
1588 | } | |
dd8ae59d | 1589 | /* |
7d680f3b | 1590 | * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE following |
dd8ae59d NB |
1591 | * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue() |
1592 | * in existing usage to ensure that outstanding descriptors are handled | |
d14921d6 | 1593 | * correctly during shutdown via transport_wait_for_tasks() |
dd8ae59d NB |
1594 | * |
1595 | * Also, we don't take cmd->t_state_lock here as we only expect | |
1596 | * this to be called for initial descriptor submission. | |
1597 | */ | |
1598 | cmd->t_state = TRANSPORT_NEW_CMD; | |
7d680f3b CH |
1599 | cmd->transport_state |= CMD_T_ACTIVE; |
1600 | ||
dd8ae59d NB |
1601 | /* |
1602 | * transport_generic_new_cmd() is already handling QUEUE_FULL, | |
1603 | * so follow TRANSPORT_NEW_CMD processing thread context usage | |
1604 | * and call transport_generic_request_failure() if necessary.. | |
1605 | */ | |
1606 | ret = transport_generic_new_cmd(cmd); | |
03e98c9e NB |
1607 | if (ret < 0) |
1608 | transport_generic_request_failure(cmd); | |
1609 | ||
dd8ae59d | 1610 | return 0; |
695434e1 NB |
1611 | } |
1612 | EXPORT_SYMBOL(transport_handle_cdb_direct); | |
1613 | ||
a6360785 NB |
1614 | /** |
1615 | * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd | |
1616 | * | |
1617 | * @se_cmd: command descriptor to submit | |
1618 | * @se_sess: associated se_sess for endpoint | |
1619 | * @cdb: pointer to SCSI CDB | |
1620 | * @sense: pointer to SCSI sense buffer | |
1621 | * @unpacked_lun: unpacked LUN to reference for struct se_lun | |
1622 | * @data_length: fabric expected data transfer length | |
1623 | * @task_addr: SAM task attribute | |
1624 | * @data_dir: DMA data direction | |
1625 | * @flags: flags for command submission from target_sc_flags_tables | |
1626 | * | |
1627 | * This may only be called from process context, and also currently | |
1628 | * assumes internal allocation of fabric payload buffer by target-core. | |
1629 | **/ | |
1edcdb49 | 1630 | void target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess, |
a6360785 NB |
1631 | unsigned char *cdb, unsigned char *sense, u32 unpacked_lun, |
1632 | u32 data_length, int task_attr, int data_dir, int flags) | |
1633 | { | |
1634 | struct se_portal_group *se_tpg; | |
1635 | int rc; | |
1636 | ||
1637 | se_tpg = se_sess->se_tpg; | |
1638 | BUG_ON(!se_tpg); | |
1639 | BUG_ON(se_cmd->se_tfo || se_cmd->se_sess); | |
1640 | BUG_ON(in_interrupt()); | |
1641 | /* | |
1642 | * Initialize se_cmd for target operation. From this point | |
1643 | * exceptions are handled by sending exception status via | |
1644 | * target_core_fabric_ops->queue_status() callback | |
1645 | */ | |
1646 | transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, | |
1647 | data_length, data_dir, task_attr, sense); | |
1648 | /* | |
1649 | * Obtain struct se_cmd->cmd_kref reference and add new cmd to | |
1650 | * se_sess->sess_cmd_list. A second kref_get here is necessary | |
1651 | * for fabrics using TARGET_SCF_ACK_KREF that expect a second | |
1652 | * kref_put() to happen during fabric packet acknowledgement. | |
1653 | */ | |
1654 | target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF)); | |
1655 | /* | |
1656 | * Signal bidirectional data payloads to target-core | |
1657 | */ | |
1658 | if (flags & TARGET_SCF_BIDI_OP) | |
1659 | se_cmd->se_cmd_flags |= SCF_BIDI; | |
1660 | /* | |
1661 | * Locate se_lun pointer and attach it to struct se_cmd | |
1662 | */ | |
735703ca NB |
1663 | if (transport_lookup_cmd_lun(se_cmd, unpacked_lun) < 0) { |
1664 | transport_send_check_condition_and_sense(se_cmd, | |
1665 | se_cmd->scsi_sense_reason, 0); | |
1666 | target_put_sess_cmd(se_sess, se_cmd); | |
1667 | return; | |
1668 | } | |
a6360785 NB |
1669 | /* |
1670 | * Sanitize CDBs via transport_generic_cmd_sequencer() and | |
1671 | * allocate the necessary tasks to complete the received CDB+data | |
1672 | */ | |
1673 | rc = transport_generic_allocate_tasks(se_cmd, cdb); | |
735703ca NB |
1674 | if (rc != 0) { |
1675 | transport_generic_request_failure(se_cmd); | |
1676 | return; | |
1677 | } | |
a6360785 NB |
1678 | /* |
1679 | * Dispatch se_cmd descriptor to se_lun->lun_se_dev backend | |
1680 | * for immediate execution of READs, otherwise wait for | |
1681 | * transport_generic_handle_data() to be called for WRITEs | |
1682 | * when fabric has filled the incoming buffer. | |
1683 | */ | |
1684 | transport_handle_cdb_direct(se_cmd); | |
1edcdb49 | 1685 | return; |
a6360785 NB |
1686 | } |
1687 | EXPORT_SYMBOL(target_submit_cmd); | |
1688 | ||
ea98d7f9 AG |
1689 | /** |
1690 | * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd | |
1691 | * for TMR CDBs | |
1692 | * | |
1693 | * @se_cmd: command descriptor to submit | |
1694 | * @se_sess: associated se_sess for endpoint | |
1695 | * @sense: pointer to SCSI sense buffer | |
1696 | * @unpacked_lun: unpacked LUN to reference for struct se_lun | |
1697 | * @fabric_context: fabric context for TMR req | |
1698 | * @tm_type: Type of TM request | |
1699 | * | |
1700 | * Callable from all contexts. | |
1701 | **/ | |
1702 | ||
1703 | void target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess, | |
1704 | unsigned char *sense, u32 unpacked_lun, | |
1705 | void *fabric_tmr_ptr, unsigned char tm_type, int flags) | |
1706 | { | |
1707 | struct se_portal_group *se_tpg; | |
1708 | int ret; | |
1709 | ||
1710 | se_tpg = se_sess->se_tpg; | |
1711 | BUG_ON(!se_tpg); | |
1712 | ||
1713 | transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, | |
1714 | 0, DMA_NONE, MSG_SIMPLE_TAG, sense); | |
1715 | ||
1716 | /* See target_submit_cmd for commentary */ | |
1717 | target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF)); | |
1718 | ||
1719 | ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, GFP_KERNEL); | |
1720 | if (ret < 0) { | |
1721 | dump_stack(); | |
1722 | /* FIXME XXX */ | |
1723 | return; | |
1724 | } | |
1725 | ||
1726 | ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun); | |
1727 | if (ret) { | |
1728 | transport_send_check_condition_and_sense(se_cmd, | |
1729 | se_cmd->scsi_sense_reason, 0); | |
1730 | transport_generic_free_cmd(se_cmd, 0); | |
1731 | return; | |
1732 | } | |
1733 | transport_generic_handle_tmr(se_cmd); | |
1734 | } | |
1735 | EXPORT_SYMBOL(target_submit_tmr); | |
1736 | ||
c66ac9db NB |
1737 | /* |
1738 | * Used by fabric module frontends defining a TFO->new_cmd_map() caller | |
1739 | * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to | |
1740 | * complete setup in TCM process context w/ TFO->new_cmd_map(). | |
1741 | */ | |
1742 | int transport_generic_handle_cdb_map( | |
1743 | struct se_cmd *cmd) | |
1744 | { | |
e3d6f909 | 1745 | if (!cmd->se_lun) { |
c66ac9db | 1746 | dump_stack(); |
6708bb27 | 1747 | pr_err("cmd->se_lun is NULL\n"); |
e3d6f909 | 1748 | return -EINVAL; |
c66ac9db NB |
1749 | } |
1750 | ||
f7a5cc0b | 1751 | transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP, false); |
c66ac9db NB |
1752 | return 0; |
1753 | } | |
1754 | EXPORT_SYMBOL(transport_generic_handle_cdb_map); | |
1755 | ||
1756 | /* transport_generic_handle_data(): | |
1757 | * | |
1758 | * | |
1759 | */ | |
1760 | int transport_generic_handle_data( | |
1761 | struct se_cmd *cmd) | |
1762 | { | |
1763 | /* | |
1764 | * For the software fabric case, then we assume the nexus is being | |
1765 | * failed/shutdown when signals are pending from the kthread context | |
1766 | * caller, so we return a failure. For the HW target mode case running | |
1767 | * in interrupt code, the signal_pending() check is skipped. | |
1768 | */ | |
1769 | if (!in_interrupt() && signal_pending(current)) | |
e3d6f909 | 1770 | return -EPERM; |
c66ac9db NB |
1771 | /* |
1772 | * If the received CDB has aleady been ABORTED by the generic | |
1773 | * target engine, we now call transport_check_aborted_status() | |
1774 | * to queue any delated TASK_ABORTED status for the received CDB to the | |
25985edc | 1775 | * fabric module as we are expecting no further incoming DATA OUT |
c66ac9db NB |
1776 | * sequences at this point. |
1777 | */ | |
1778 | if (transport_check_aborted_status(cmd, 1) != 0) | |
1779 | return 0; | |
1780 | ||
f7a5cc0b | 1781 | transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE, false); |
c66ac9db NB |
1782 | return 0; |
1783 | } | |
1784 | EXPORT_SYMBOL(transport_generic_handle_data); | |
1785 | ||
1786 | /* transport_generic_handle_tmr(): | |
1787 | * | |
1788 | * | |
1789 | */ | |
1790 | int transport_generic_handle_tmr( | |
1791 | struct se_cmd *cmd) | |
1792 | { | |
f7a5cc0b | 1793 | transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR, false); |
c66ac9db NB |
1794 | return 0; |
1795 | } | |
1796 | EXPORT_SYMBOL(transport_generic_handle_tmr); | |
1797 | ||
cdbb70bb CH |
1798 | /* |
1799 | * If the task is active, request it to be stopped and sleep until it | |
1800 | * has completed. | |
1801 | */ | |
1802 | bool target_stop_task(struct se_task *task, unsigned long *flags) | |
1803 | { | |
1804 | struct se_cmd *cmd = task->task_se_cmd; | |
1805 | bool was_active = false; | |
1806 | ||
1807 | if (task->task_flags & TF_ACTIVE) { | |
1808 | task->task_flags |= TF_REQUEST_STOP; | |
1809 | spin_unlock_irqrestore(&cmd->t_state_lock, *flags); | |
1810 | ||
1811 | pr_debug("Task %p waiting to complete\n", task); | |
1812 | wait_for_completion(&task->task_stop_comp); | |
1813 | pr_debug("Task %p stopped successfully\n", task); | |
1814 | ||
1815 | spin_lock_irqsave(&cmd->t_state_lock, *flags); | |
1816 | atomic_dec(&cmd->t_task_cdbs_left); | |
1817 | task->task_flags &= ~(TF_ACTIVE | TF_REQUEST_STOP); | |
1818 | was_active = true; | |
1819 | } | |
1820 | ||
cdbb70bb CH |
1821 | return was_active; |
1822 | } | |
1823 | ||
c66ac9db NB |
1824 | static int transport_stop_tasks_for_cmd(struct se_cmd *cmd) |
1825 | { | |
1826 | struct se_task *task, *task_tmp; | |
1827 | unsigned long flags; | |
1828 | int ret = 0; | |
1829 | ||
6708bb27 | 1830 | pr_debug("ITT[0x%08x] - Stopping tasks\n", |
e3d6f909 | 1831 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db NB |
1832 | |
1833 | /* | |
1834 | * No tasks remain in the execution queue | |
1835 | */ | |
a1d8b49a | 1836 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 1837 | list_for_each_entry_safe(task, task_tmp, |
a1d8b49a | 1838 | &cmd->t_task_list, t_list) { |
04629b7b | 1839 | pr_debug("Processing task %p\n", task); |
c66ac9db NB |
1840 | /* |
1841 | * If the struct se_task has not been sent and is not active, | |
1842 | * remove the struct se_task from the execution queue. | |
1843 | */ | |
6c76bf95 | 1844 | if (!(task->task_flags & (TF_ACTIVE | TF_SENT))) { |
a1d8b49a | 1845 | spin_unlock_irqrestore(&cmd->t_state_lock, |
c66ac9db NB |
1846 | flags); |
1847 | transport_remove_task_from_execute_queue(task, | |
42bf829e | 1848 | cmd->se_dev); |
c66ac9db | 1849 | |
04629b7b | 1850 | pr_debug("Task %p removed from execute queue\n", task); |
a1d8b49a | 1851 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db NB |
1852 | continue; |
1853 | } | |
1854 | ||
cdbb70bb | 1855 | if (!target_stop_task(task, &flags)) { |
04629b7b | 1856 | pr_debug("Task %p - did nothing\n", task); |
c66ac9db NB |
1857 | ret++; |
1858 | } | |
c66ac9db | 1859 | } |
a1d8b49a | 1860 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
1861 | |
1862 | return ret; | |
1863 | } | |
1864 | ||
c66ac9db NB |
1865 | /* |
1866 | * Handle SAM-esque emulation for generic transport request failures. | |
1867 | */ | |
2fbff127 | 1868 | void transport_generic_request_failure(struct se_cmd *cmd) |
c66ac9db | 1869 | { |
07bde79a NB |
1870 | int ret = 0; |
1871 | ||
6708bb27 | 1872 | pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x" |
e3d6f909 | 1873 | " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd), |
a1d8b49a | 1874 | cmd->t_task_cdb[0]); |
03e98c9e | 1875 | pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n", |
e3d6f909 | 1876 | cmd->se_tfo->get_cmd_state(cmd), |
03e98c9e | 1877 | cmd->t_state, cmd->scsi_sense_reason); |
6708bb27 | 1878 | pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d" |
c66ac9db | 1879 | " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --" |
7d680f3b CH |
1880 | " CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n", |
1881 | cmd->t_task_list_num, | |
a1d8b49a AG |
1882 | atomic_read(&cmd->t_task_cdbs_left), |
1883 | atomic_read(&cmd->t_task_cdbs_sent), | |
1884 | atomic_read(&cmd->t_task_cdbs_ex_left), | |
7d680f3b CH |
1885 | (cmd->transport_state & CMD_T_ACTIVE) != 0, |
1886 | (cmd->transport_state & CMD_T_STOP) != 0, | |
1887 | (cmd->transport_state & CMD_T_SENT) != 0); | |
c66ac9db | 1888 | |
c66ac9db NB |
1889 | /* |
1890 | * For SAM Task Attribute emulation for failed struct se_cmd | |
1891 | */ | |
1892 | if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) | |
1893 | transport_complete_task_attr(cmd); | |
1894 | ||
03e98c9e NB |
1895 | switch (cmd->scsi_sense_reason) { |
1896 | case TCM_NON_EXISTENT_LUN: | |
1897 | case TCM_UNSUPPORTED_SCSI_OPCODE: | |
1898 | case TCM_INVALID_CDB_FIELD: | |
1899 | case TCM_INVALID_PARAMETER_LIST: | |
1900 | case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE: | |
1901 | case TCM_UNKNOWN_MODE_PAGE: | |
1902 | case TCM_WRITE_PROTECTED: | |
1903 | case TCM_CHECK_CONDITION_ABORT_CMD: | |
1904 | case TCM_CHECK_CONDITION_UNIT_ATTENTION: | |
1905 | case TCM_CHECK_CONDITION_NOT_READY: | |
c66ac9db | 1906 | break; |
03e98c9e | 1907 | case TCM_RESERVATION_CONFLICT: |
c66ac9db NB |
1908 | /* |
1909 | * No SENSE Data payload for this case, set SCSI Status | |
1910 | * and queue the response to $FABRIC_MOD. | |
1911 | * | |
1912 | * Uses linux/include/scsi/scsi.h SAM status codes defs | |
1913 | */ | |
1914 | cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT; | |
1915 | /* | |
1916 | * For UA Interlock Code 11b, a RESERVATION CONFLICT will | |
1917 | * establish a UNIT ATTENTION with PREVIOUS RESERVATION | |
1918 | * CONFLICT STATUS. | |
1919 | * | |
1920 | * See spc4r17, section 7.4.6 Control Mode Page, Table 349 | |
1921 | */ | |
e3d6f909 AG |
1922 | if (cmd->se_sess && |
1923 | cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2) | |
1924 | core_scsi3_ua_allocate(cmd->se_sess->se_node_acl, | |
c66ac9db NB |
1925 | cmd->orig_fe_lun, 0x2C, |
1926 | ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS); | |
1927 | ||
07bde79a | 1928 | ret = cmd->se_tfo->queue_status(cmd); |
f147abb4 | 1929 | if (ret == -EAGAIN || ret == -ENOMEM) |
07bde79a | 1930 | goto queue_full; |
c66ac9db | 1931 | goto check_stop; |
c66ac9db | 1932 | default: |
6708bb27 | 1933 | pr_err("Unknown transport error for CDB 0x%02x: %d\n", |
03e98c9e | 1934 | cmd->t_task_cdb[0], cmd->scsi_sense_reason); |
c66ac9db NB |
1935 | cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; |
1936 | break; | |
1937 | } | |
16ab8e60 NB |
1938 | /* |
1939 | * If a fabric does not define a cmd->se_tfo->new_cmd_map caller, | |
1940 | * make the call to transport_send_check_condition_and_sense() | |
1941 | * directly. Otherwise expect the fabric to make the call to | |
1942 | * transport_send_check_condition_and_sense() after handling | |
1943 | * possible unsoliticied write data payloads. | |
1944 | */ | |
03e98c9e NB |
1945 | ret = transport_send_check_condition_and_sense(cmd, |
1946 | cmd->scsi_sense_reason, 0); | |
1947 | if (ret == -EAGAIN || ret == -ENOMEM) | |
1948 | goto queue_full; | |
07bde79a | 1949 | |
c66ac9db NB |
1950 | check_stop: |
1951 | transport_lun_remove_cmd(cmd); | |
6708bb27 | 1952 | if (!transport_cmd_check_stop_to_fabric(cmd)) |
c66ac9db | 1953 | ; |
07bde79a NB |
1954 | return; |
1955 | ||
1956 | queue_full: | |
e057f533 CH |
1957 | cmd->t_state = TRANSPORT_COMPLETE_QF_OK; |
1958 | transport_handle_queue_full(cmd, cmd->se_dev); | |
c66ac9db | 1959 | } |
2fbff127 | 1960 | EXPORT_SYMBOL(transport_generic_request_failure); |
c66ac9db | 1961 | |
c66ac9db NB |
1962 | static inline u32 transport_lba_21(unsigned char *cdb) |
1963 | { | |
1964 | return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3]; | |
1965 | } | |
1966 | ||
1967 | static inline u32 transport_lba_32(unsigned char *cdb) | |
1968 | { | |
1969 | return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; | |
1970 | } | |
1971 | ||
1972 | static inline unsigned long long transport_lba_64(unsigned char *cdb) | |
1973 | { | |
1974 | unsigned int __v1, __v2; | |
1975 | ||
1976 | __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; | |
1977 | __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; | |
1978 | ||
1979 | return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; | |
1980 | } | |
1981 | ||
1982 | /* | |
1983 | * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs | |
1984 | */ | |
1985 | static inline unsigned long long transport_lba_64_ext(unsigned char *cdb) | |
1986 | { | |
1987 | unsigned int __v1, __v2; | |
1988 | ||
1989 | __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15]; | |
1990 | __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19]; | |
1991 | ||
1992 | return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; | |
1993 | } | |
1994 | ||
1995 | static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd) | |
1996 | { | |
1997 | unsigned long flags; | |
1998 | ||
a1d8b49a | 1999 | spin_lock_irqsave(&se_cmd->t_state_lock, flags); |
c66ac9db | 2000 | se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE; |
a1d8b49a | 2001 | spin_unlock_irqrestore(&se_cmd->t_state_lock, flags); |
c66ac9db NB |
2002 | } |
2003 | ||
c66ac9db NB |
2004 | /* |
2005 | * Called from Fabric Module context from transport_execute_tasks() | |
2006 | * | |
2007 | * The return of this function determins if the tasks from struct se_cmd | |
2008 | * get added to the execution queue in transport_execute_tasks(), | |
2009 | * or are added to the delayed or ordered lists here. | |
2010 | */ | |
2011 | static inline int transport_execute_task_attr(struct se_cmd *cmd) | |
2012 | { | |
5951146d | 2013 | if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) |
c66ac9db NB |
2014 | return 1; |
2015 | /* | |
25985edc | 2016 | * Check for the existence of HEAD_OF_QUEUE, and if true return 1 |
c66ac9db NB |
2017 | * to allow the passed struct se_cmd list of tasks to the front of the list. |
2018 | */ | |
e66ecd50 | 2019 | if (cmd->sam_task_attr == MSG_HEAD_TAG) { |
6708bb27 | 2020 | pr_debug("Added HEAD_OF_QUEUE for CDB:" |
c66ac9db | 2021 | " 0x%02x, se_ordered_id: %u\n", |
6708bb27 | 2022 | cmd->t_task_cdb[0], |
c66ac9db NB |
2023 | cmd->se_ordered_id); |
2024 | return 1; | |
e66ecd50 | 2025 | } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) { |
5951146d | 2026 | atomic_inc(&cmd->se_dev->dev_ordered_sync); |
c66ac9db NB |
2027 | smp_mb__after_atomic_inc(); |
2028 | ||
6708bb27 | 2029 | pr_debug("Added ORDERED for CDB: 0x%02x to ordered" |
c66ac9db | 2030 | " list, se_ordered_id: %u\n", |
a1d8b49a | 2031 | cmd->t_task_cdb[0], |
c66ac9db NB |
2032 | cmd->se_ordered_id); |
2033 | /* | |
2034 | * Add ORDERED command to tail of execution queue if | |
2035 | * no other older commands exist that need to be | |
2036 | * completed first. | |
2037 | */ | |
6708bb27 | 2038 | if (!atomic_read(&cmd->se_dev->simple_cmds)) |
c66ac9db NB |
2039 | return 1; |
2040 | } else { | |
2041 | /* | |
2042 | * For SIMPLE and UNTAGGED Task Attribute commands | |
2043 | */ | |
5951146d | 2044 | atomic_inc(&cmd->se_dev->simple_cmds); |
c66ac9db NB |
2045 | smp_mb__after_atomic_inc(); |
2046 | } | |
2047 | /* | |
2048 | * Otherwise if one or more outstanding ORDERED task attribute exist, | |
2049 | * add the dormant task(s) built for the passed struct se_cmd to the | |
2050 | * execution queue and become in Active state for this struct se_device. | |
2051 | */ | |
5951146d | 2052 | if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) { |
c66ac9db NB |
2053 | /* |
2054 | * Otherwise, add cmd w/ tasks to delayed cmd queue that | |
25985edc | 2055 | * will be drained upon completion of HEAD_OF_QUEUE task. |
c66ac9db | 2056 | */ |
5951146d | 2057 | spin_lock(&cmd->se_dev->delayed_cmd_lock); |
c66ac9db | 2058 | cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR; |
5951146d AG |
2059 | list_add_tail(&cmd->se_delayed_node, |
2060 | &cmd->se_dev->delayed_cmd_list); | |
2061 | spin_unlock(&cmd->se_dev->delayed_cmd_lock); | |
c66ac9db | 2062 | |
6708bb27 | 2063 | pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to" |
c66ac9db | 2064 | " delayed CMD list, se_ordered_id: %u\n", |
a1d8b49a | 2065 | cmd->t_task_cdb[0], cmd->sam_task_attr, |
c66ac9db NB |
2066 | cmd->se_ordered_id); |
2067 | /* | |
2068 | * Return zero to let transport_execute_tasks() know | |
2069 | * not to add the delayed tasks to the execution list. | |
2070 | */ | |
2071 | return 0; | |
2072 | } | |
2073 | /* | |
2074 | * Otherwise, no ORDERED task attributes exist.. | |
2075 | */ | |
2076 | return 1; | |
2077 | } | |
2078 | ||
2079 | /* | |
2080 | * Called from fabric module context in transport_generic_new_cmd() and | |
2081 | * transport_generic_process_write() | |
2082 | */ | |
2083 | static int transport_execute_tasks(struct se_cmd *cmd) | |
2084 | { | |
2085 | int add_tasks; | |
40be67f4 | 2086 | struct se_device *se_dev = cmd->se_dev; |
c66ac9db NB |
2087 | /* |
2088 | * Call transport_cmd_check_stop() to see if a fabric exception | |
25985edc | 2089 | * has occurred that prevents execution. |
c66ac9db | 2090 | */ |
6708bb27 | 2091 | if (!transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING)) { |
c66ac9db NB |
2092 | /* |
2093 | * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE | |
2094 | * attribute for the tasks of the received struct se_cmd CDB | |
2095 | */ | |
2096 | add_tasks = transport_execute_task_attr(cmd); | |
e3d6f909 | 2097 | if (!add_tasks) |
c66ac9db NB |
2098 | goto execute_tasks; |
2099 | /* | |
4d2300cc NB |
2100 | * __transport_execute_tasks() -> __transport_add_tasks_from_cmd() |
2101 | * adds associated se_tasks while holding dev->execute_task_lock | |
2102 | * before I/O dispath to avoid a double spinlock access. | |
c66ac9db | 2103 | */ |
4d2300cc NB |
2104 | __transport_execute_tasks(se_dev, cmd); |
2105 | return 0; | |
c66ac9db | 2106 | } |
4d2300cc | 2107 | |
c66ac9db | 2108 | execute_tasks: |
4d2300cc | 2109 | __transport_execute_tasks(se_dev, NULL); |
c66ac9db NB |
2110 | return 0; |
2111 | } | |
2112 | ||
2113 | /* | |
2114 | * Called to check struct se_device tcq depth window, and once open pull struct se_task | |
2115 | * from struct se_device->execute_task_list and | |
2116 | * | |
2117 | * Called from transport_processing_thread() | |
2118 | */ | |
4d2300cc | 2119 | static int __transport_execute_tasks(struct se_device *dev, struct se_cmd *new_cmd) |
c66ac9db NB |
2120 | { |
2121 | int error; | |
2122 | struct se_cmd *cmd = NULL; | |
e3d6f909 | 2123 | struct se_task *task = NULL; |
c66ac9db NB |
2124 | unsigned long flags; |
2125 | ||
c66ac9db | 2126 | check_depth: |
e3d6f909 | 2127 | spin_lock_irq(&dev->execute_task_lock); |
4d2300cc NB |
2128 | if (new_cmd != NULL) |
2129 | __transport_add_tasks_from_cmd(new_cmd); | |
2130 | ||
e3d6f909 AG |
2131 | if (list_empty(&dev->execute_task_list)) { |
2132 | spin_unlock_irq(&dev->execute_task_lock); | |
c66ac9db NB |
2133 | return 0; |
2134 | } | |
e3d6f909 AG |
2135 | task = list_first_entry(&dev->execute_task_list, |
2136 | struct se_task, t_execute_list); | |
04629b7b | 2137 | __transport_remove_task_from_execute_queue(task, dev); |
e3d6f909 | 2138 | spin_unlock_irq(&dev->execute_task_lock); |
c66ac9db | 2139 | |
e3d6f909 | 2140 | cmd = task->task_se_cmd; |
a1d8b49a | 2141 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
6c76bf95 | 2142 | task->task_flags |= (TF_ACTIVE | TF_SENT); |
a1d8b49a | 2143 | atomic_inc(&cmd->t_task_cdbs_sent); |
c66ac9db | 2144 | |
a1d8b49a AG |
2145 | if (atomic_read(&cmd->t_task_cdbs_sent) == |
2146 | cmd->t_task_list_num) | |
7d680f3b | 2147 | cmd->transport_state |= CMD_T_SENT; |
c66ac9db | 2148 | |
a1d8b49a | 2149 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 2150 | |
5bda90c8 CH |
2151 | if (cmd->execute_task) |
2152 | error = cmd->execute_task(task); | |
2153 | else | |
2154 | error = dev->transport->do_task(task); | |
d29a5b6a | 2155 | if (error != 0) { |
d29a5b6a CH |
2156 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
2157 | task->task_flags &= ~TF_ACTIVE; | |
7d680f3b | 2158 | cmd->transport_state &= ~CMD_T_SENT; |
d29a5b6a | 2159 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
7d680f3b | 2160 | |
d29a5b6a | 2161 | transport_stop_tasks_for_cmd(cmd); |
03e98c9e | 2162 | transport_generic_request_failure(cmd); |
c66ac9db NB |
2163 | } |
2164 | ||
4d2300cc | 2165 | new_cmd = NULL; |
c66ac9db NB |
2166 | goto check_depth; |
2167 | ||
2168 | return 0; | |
2169 | } | |
2170 | ||
c66ac9db NB |
2171 | static inline u32 transport_get_sectors_6( |
2172 | unsigned char *cdb, | |
2173 | struct se_cmd *cmd, | |
2174 | int *ret) | |
2175 | { | |
5951146d | 2176 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
2177 | |
2178 | /* | |
2179 | * Assume TYPE_DISK for non struct se_device objects. | |
2180 | * Use 8-bit sector value. | |
2181 | */ | |
2182 | if (!dev) | |
2183 | goto type_disk; | |
2184 | ||
2185 | /* | |
2186 | * Use 24-bit allocation length for TYPE_TAPE. | |
2187 | */ | |
e3d6f909 | 2188 | if (dev->transport->get_device_type(dev) == TYPE_TAPE) |
c66ac9db NB |
2189 | return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4]; |
2190 | ||
2191 | /* | |
2192 | * Everything else assume TYPE_DISK Sector CDB location. | |
9b5cd7f3 RD |
2193 | * Use 8-bit sector value. SBC-3 says: |
2194 | * | |
2195 | * A TRANSFER LENGTH field set to zero specifies that 256 | |
2196 | * logical blocks shall be written. Any other value | |
2197 | * specifies the number of logical blocks that shall be | |
2198 | * written. | |
c66ac9db NB |
2199 | */ |
2200 | type_disk: | |
9b5cd7f3 | 2201 | return cdb[4] ? : 256; |
c66ac9db NB |
2202 | } |
2203 | ||
2204 | static inline u32 transport_get_sectors_10( | |
2205 | unsigned char *cdb, | |
2206 | struct se_cmd *cmd, | |
2207 | int *ret) | |
2208 | { | |
5951146d | 2209 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
2210 | |
2211 | /* | |
2212 | * Assume TYPE_DISK for non struct se_device objects. | |
2213 | * Use 16-bit sector value. | |
2214 | */ | |
2215 | if (!dev) | |
2216 | goto type_disk; | |
2217 | ||
2218 | /* | |
2219 | * XXX_10 is not defined in SSC, throw an exception | |
2220 | */ | |
e3d6f909 AG |
2221 | if (dev->transport->get_device_type(dev) == TYPE_TAPE) { |
2222 | *ret = -EINVAL; | |
c66ac9db NB |
2223 | return 0; |
2224 | } | |
2225 | ||
2226 | /* | |
2227 | * Everything else assume TYPE_DISK Sector CDB location. | |
2228 | * Use 16-bit sector value. | |
2229 | */ | |
2230 | type_disk: | |
2231 | return (u32)(cdb[7] << 8) + cdb[8]; | |
2232 | } | |
2233 | ||
2234 | static inline u32 transport_get_sectors_12( | |
2235 | unsigned char *cdb, | |
2236 | struct se_cmd *cmd, | |
2237 | int *ret) | |
2238 | { | |
5951146d | 2239 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
2240 | |
2241 | /* | |
2242 | * Assume TYPE_DISK for non struct se_device objects. | |
2243 | * Use 32-bit sector value. | |
2244 | */ | |
2245 | if (!dev) | |
2246 | goto type_disk; | |
2247 | ||
2248 | /* | |
2249 | * XXX_12 is not defined in SSC, throw an exception | |
2250 | */ | |
e3d6f909 AG |
2251 | if (dev->transport->get_device_type(dev) == TYPE_TAPE) { |
2252 | *ret = -EINVAL; | |
c66ac9db NB |
2253 | return 0; |
2254 | } | |
2255 | ||
2256 | /* | |
2257 | * Everything else assume TYPE_DISK Sector CDB location. | |
2258 | * Use 32-bit sector value. | |
2259 | */ | |
2260 | type_disk: | |
2261 | return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9]; | |
2262 | } | |
2263 | ||
2264 | static inline u32 transport_get_sectors_16( | |
2265 | unsigned char *cdb, | |
2266 | struct se_cmd *cmd, | |
2267 | int *ret) | |
2268 | { | |
5951146d | 2269 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
2270 | |
2271 | /* | |
2272 | * Assume TYPE_DISK for non struct se_device objects. | |
2273 | * Use 32-bit sector value. | |
2274 | */ | |
2275 | if (!dev) | |
2276 | goto type_disk; | |
2277 | ||
2278 | /* | |
2279 | * Use 24-bit allocation length for TYPE_TAPE. | |
2280 | */ | |
e3d6f909 | 2281 | if (dev->transport->get_device_type(dev) == TYPE_TAPE) |
c66ac9db NB |
2282 | return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14]; |
2283 | ||
2284 | type_disk: | |
2285 | return (u32)(cdb[10] << 24) + (cdb[11] << 16) + | |
2286 | (cdb[12] << 8) + cdb[13]; | |
2287 | } | |
2288 | ||
2289 | /* | |
2290 | * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants | |
2291 | */ | |
2292 | static inline u32 transport_get_sectors_32( | |
2293 | unsigned char *cdb, | |
2294 | struct se_cmd *cmd, | |
2295 | int *ret) | |
2296 | { | |
2297 | /* | |
2298 | * Assume TYPE_DISK for non struct se_device objects. | |
2299 | * Use 32-bit sector value. | |
2300 | */ | |
2301 | return (u32)(cdb[28] << 24) + (cdb[29] << 16) + | |
2302 | (cdb[30] << 8) + cdb[31]; | |
2303 | ||
2304 | } | |
2305 | ||
2306 | static inline u32 transport_get_size( | |
2307 | u32 sectors, | |
2308 | unsigned char *cdb, | |
2309 | struct se_cmd *cmd) | |
2310 | { | |
5951146d | 2311 | struct se_device *dev = cmd->se_dev; |
c66ac9db | 2312 | |
e3d6f909 | 2313 | if (dev->transport->get_device_type(dev) == TYPE_TAPE) { |
c66ac9db | 2314 | if (cdb[1] & 1) { /* sectors */ |
e3d6f909 | 2315 | return dev->se_sub_dev->se_dev_attrib.block_size * sectors; |
c66ac9db NB |
2316 | } else /* bytes */ |
2317 | return sectors; | |
2318 | } | |
2319 | #if 0 | |
6708bb27 | 2320 | pr_debug("Returning block_size: %u, sectors: %u == %u for" |
e3d6f909 AG |
2321 | " %s object\n", dev->se_sub_dev->se_dev_attrib.block_size, sectors, |
2322 | dev->se_sub_dev->se_dev_attrib.block_size * sectors, | |
2323 | dev->transport->name); | |
c66ac9db | 2324 | #endif |
e3d6f909 | 2325 | return dev->se_sub_dev->se_dev_attrib.block_size * sectors; |
c66ac9db NB |
2326 | } |
2327 | ||
c66ac9db NB |
2328 | static void transport_xor_callback(struct se_cmd *cmd) |
2329 | { | |
2330 | unsigned char *buf, *addr; | |
ec98f782 | 2331 | struct scatterlist *sg; |
c66ac9db NB |
2332 | unsigned int offset; |
2333 | int i; | |
ec98f782 | 2334 | int count; |
c66ac9db NB |
2335 | /* |
2336 | * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command | |
2337 | * | |
2338 | * 1) read the specified logical block(s); | |
2339 | * 2) transfer logical blocks from the data-out buffer; | |
2340 | * 3) XOR the logical blocks transferred from the data-out buffer with | |
2341 | * the logical blocks read, storing the resulting XOR data in a buffer; | |
2342 | * 4) if the DISABLE WRITE bit is set to zero, then write the logical | |
2343 | * blocks transferred from the data-out buffer; and | |
2344 | * 5) transfer the resulting XOR data to the data-in buffer. | |
2345 | */ | |
2346 | buf = kmalloc(cmd->data_length, GFP_KERNEL); | |
6708bb27 AG |
2347 | if (!buf) { |
2348 | pr_err("Unable to allocate xor_callback buf\n"); | |
c66ac9db NB |
2349 | return; |
2350 | } | |
2351 | /* | |
ec98f782 | 2352 | * Copy the scatterlist WRITE buffer located at cmd->t_data_sg |
c66ac9db NB |
2353 | * into the locally allocated *buf |
2354 | */ | |
ec98f782 AG |
2355 | sg_copy_to_buffer(cmd->t_data_sg, |
2356 | cmd->t_data_nents, | |
2357 | buf, | |
2358 | cmd->data_length); | |
2359 | ||
c66ac9db NB |
2360 | /* |
2361 | * Now perform the XOR against the BIDI read memory located at | |
a1d8b49a | 2362 | * cmd->t_mem_bidi_list |
c66ac9db NB |
2363 | */ |
2364 | ||
2365 | offset = 0; | |
ec98f782 AG |
2366 | for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) { |
2367 | addr = kmap_atomic(sg_page(sg), KM_USER0); | |
2368 | if (!addr) | |
c66ac9db NB |
2369 | goto out; |
2370 | ||
ec98f782 AG |
2371 | for (i = 0; i < sg->length; i++) |
2372 | *(addr + sg->offset + i) ^= *(buf + offset + i); | |
c66ac9db | 2373 | |
ec98f782 | 2374 | offset += sg->length; |
c66ac9db NB |
2375 | kunmap_atomic(addr, KM_USER0); |
2376 | } | |
ec98f782 | 2377 | |
c66ac9db NB |
2378 | out: |
2379 | kfree(buf); | |
2380 | } | |
2381 | ||
2382 | /* | |
2383 | * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd | |
2384 | */ | |
2385 | static int transport_get_sense_data(struct se_cmd *cmd) | |
2386 | { | |
2387 | unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL; | |
42bf829e | 2388 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
2389 | struct se_task *task = NULL, *task_tmp; |
2390 | unsigned long flags; | |
2391 | u32 offset = 0; | |
2392 | ||
e3d6f909 AG |
2393 | WARN_ON(!cmd->se_lun); |
2394 | ||
42bf829e CH |
2395 | if (!dev) |
2396 | return 0; | |
2397 | ||
a1d8b49a | 2398 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 2399 | if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) { |
a1d8b49a | 2400 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
2401 | return 0; |
2402 | } | |
2403 | ||
2404 | list_for_each_entry_safe(task, task_tmp, | |
a1d8b49a | 2405 | &cmd->t_task_list, t_list) { |
ef804a84 | 2406 | if (!(task->task_flags & TF_HAS_SENSE)) |
c66ac9db NB |
2407 | continue; |
2408 | ||
e3d6f909 | 2409 | if (!dev->transport->get_sense_buffer) { |
6708bb27 | 2410 | pr_err("dev->transport->get_sense_buffer" |
c66ac9db NB |
2411 | " is NULL\n"); |
2412 | continue; | |
2413 | } | |
2414 | ||
e3d6f909 | 2415 | sense_buffer = dev->transport->get_sense_buffer(task); |
6708bb27 | 2416 | if (!sense_buffer) { |
04629b7b | 2417 | pr_err("ITT[0x%08x]_TASK[%p]: Unable to locate" |
c66ac9db | 2418 | " sense buffer for task with sense\n", |
04629b7b | 2419 | cmd->se_tfo->get_task_tag(cmd), task); |
c66ac9db NB |
2420 | continue; |
2421 | } | |
a1d8b49a | 2422 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 2423 | |
e3d6f909 | 2424 | offset = cmd->se_tfo->set_fabric_sense_len(cmd, |
c66ac9db NB |
2425 | TRANSPORT_SENSE_BUFFER); |
2426 | ||
5951146d | 2427 | memcpy(&buffer[offset], sense_buffer, |
c66ac9db NB |
2428 | TRANSPORT_SENSE_BUFFER); |
2429 | cmd->scsi_status = task->task_scsi_status; | |
2430 | /* Automatically padded */ | |
2431 | cmd->scsi_sense_length = | |
2432 | (TRANSPORT_SENSE_BUFFER + offset); | |
2433 | ||
6708bb27 | 2434 | pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x" |
c66ac9db | 2435 | " and sense\n", |
e3d6f909 | 2436 | dev->se_hba->hba_id, dev->transport->name, |
c66ac9db NB |
2437 | cmd->scsi_status); |
2438 | return 0; | |
2439 | } | |
a1d8b49a | 2440 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
2441 | |
2442 | return -1; | |
2443 | } | |
2444 | ||
ec98f782 AG |
2445 | static inline long long transport_dev_end_lba(struct se_device *dev) |
2446 | { | |
2447 | return dev->transport->get_blocks(dev) + 1; | |
2448 | } | |
2449 | ||
2450 | static int transport_cmd_get_valid_sectors(struct se_cmd *cmd) | |
2451 | { | |
2452 | struct se_device *dev = cmd->se_dev; | |
2453 | u32 sectors; | |
2454 | ||
2455 | if (dev->transport->get_device_type(dev) != TYPE_DISK) | |
2456 | return 0; | |
2457 | ||
2458 | sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size); | |
2459 | ||
6708bb27 AG |
2460 | if ((cmd->t_task_lba + sectors) > transport_dev_end_lba(dev)) { |
2461 | pr_err("LBA: %llu Sectors: %u exceeds" | |
ec98f782 AG |
2462 | " transport_dev_end_lba(): %llu\n", |
2463 | cmd->t_task_lba, sectors, | |
2464 | transport_dev_end_lba(dev)); | |
7abbe7f3 | 2465 | return -EINVAL; |
ec98f782 AG |
2466 | } |
2467 | ||
7abbe7f3 | 2468 | return 0; |
ec98f782 AG |
2469 | } |
2470 | ||
706d5860 NB |
2471 | static int target_check_write_same_discard(unsigned char *flags, struct se_device *dev) |
2472 | { | |
2473 | /* | |
2474 | * Determine if the received WRITE_SAME is used to for direct | |
2475 | * passthrough into Linux/SCSI with struct request via TCM/pSCSI | |
2476 | * or we are signaling the use of internal WRITE_SAME + UNMAP=1 | |
2477 | * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code. | |
2478 | */ | |
2479 | int passthrough = (dev->transport->transport_type == | |
2480 | TRANSPORT_PLUGIN_PHBA_PDEV); | |
2481 | ||
2482 | if (!passthrough) { | |
2483 | if ((flags[0] & 0x04) || (flags[0] & 0x02)) { | |
2484 | pr_err("WRITE_SAME PBDATA and LBDATA" | |
2485 | " bits not supported for Block Discard" | |
2486 | " Emulation\n"); | |
2487 | return -ENOSYS; | |
2488 | } | |
2489 | /* | |
2490 | * Currently for the emulated case we only accept | |
2491 | * tpws with the UNMAP=1 bit set. | |
2492 | */ | |
2493 | if (!(flags[0] & 0x08)) { | |
2494 | pr_err("WRITE_SAME w/o UNMAP bit not" | |
2495 | " supported for Block Discard Emulation\n"); | |
2496 | return -ENOSYS; | |
2497 | } | |
2498 | } | |
2499 | ||
2500 | return 0; | |
2501 | } | |
2502 | ||
c66ac9db NB |
2503 | /* transport_generic_cmd_sequencer(): |
2504 | * | |
2505 | * Generic Command Sequencer that should work for most DAS transport | |
2506 | * drivers. | |
2507 | * | |
2508 | * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD | |
2509 | * RX Thread. | |
2510 | * | |
2511 | * FIXME: Need to support other SCSI OPCODES where as well. | |
2512 | */ | |
2513 | static int transport_generic_cmd_sequencer( | |
2514 | struct se_cmd *cmd, | |
2515 | unsigned char *cdb) | |
2516 | { | |
5951146d | 2517 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
2518 | struct se_subsystem_dev *su_dev = dev->se_sub_dev; |
2519 | int ret = 0, sector_ret = 0, passthrough; | |
2520 | u32 sectors = 0, size = 0, pr_reg_type = 0; | |
2521 | u16 service_action; | |
2522 | u8 alua_ascq = 0; | |
2523 | /* | |
2524 | * Check for an existing UNIT ATTENTION condition | |
2525 | */ | |
2526 | if (core_scsi3_ua_check(cmd, cdb) < 0) { | |
c66ac9db NB |
2527 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; |
2528 | cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION; | |
5951146d | 2529 | return -EINVAL; |
c66ac9db NB |
2530 | } |
2531 | /* | |
2532 | * Check status of Asymmetric Logical Unit Assignment port | |
2533 | */ | |
e3d6f909 | 2534 | ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq); |
c66ac9db | 2535 | if (ret != 0) { |
c66ac9db | 2536 | /* |
25985edc | 2537 | * Set SCSI additional sense code (ASC) to 'LUN Not Accessible'; |
c66ac9db NB |
2538 | * The ALUA additional sense code qualifier (ASCQ) is determined |
2539 | * by the ALUA primary or secondary access state.. | |
2540 | */ | |
2541 | if (ret > 0) { | |
2542 | #if 0 | |
6708bb27 | 2543 | pr_debug("[%s]: ALUA TG Port not available," |
c66ac9db | 2544 | " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n", |
e3d6f909 | 2545 | cmd->se_tfo->get_fabric_name(), alua_ascq); |
c66ac9db NB |
2546 | #endif |
2547 | transport_set_sense_codes(cmd, 0x04, alua_ascq); | |
2548 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
2549 | cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY; | |
5951146d | 2550 | return -EINVAL; |
c66ac9db NB |
2551 | } |
2552 | goto out_invalid_cdb_field; | |
2553 | } | |
2554 | /* | |
2555 | * Check status for SPC-3 Persistent Reservations | |
2556 | */ | |
e3d6f909 AG |
2557 | if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type) != 0) { |
2558 | if (su_dev->t10_pr.pr_ops.t10_seq_non_holder( | |
03e98c9e NB |
2559 | cmd, cdb, pr_reg_type) != 0) { |
2560 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
2561 | cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT; | |
2562 | cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; | |
2563 | return -EBUSY; | |
2564 | } | |
c66ac9db NB |
2565 | /* |
2566 | * This means the CDB is allowed for the SCSI Initiator port | |
2567 | * when said port is *NOT* holding the legacy SPC-2 or | |
2568 | * SPC-3 Persistent Reservation. | |
2569 | */ | |
2570 | } | |
2571 | ||
5bda90c8 CH |
2572 | /* |
2573 | * If we operate in passthrough mode we skip most CDB emulation and | |
2574 | * instead hand the commands down to the physical SCSI device. | |
2575 | */ | |
2576 | passthrough = | |
2577 | (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV); | |
2578 | ||
c66ac9db NB |
2579 | switch (cdb[0]) { |
2580 | case READ_6: | |
2581 | sectors = transport_get_sectors_6(cdb, cmd, §or_ret); | |
2582 | if (sector_ret) | |
2583 | goto out_unsupported_cdb; | |
2584 | size = transport_get_size(sectors, cdb, cmd); | |
a1d8b49a | 2585 | cmd->t_task_lba = transport_lba_21(cdb); |
c66ac9db NB |
2586 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2587 | break; | |
2588 | case READ_10: | |
2589 | sectors = transport_get_sectors_10(cdb, cmd, §or_ret); | |
2590 | if (sector_ret) | |
2591 | goto out_unsupported_cdb; | |
2592 | size = transport_get_size(sectors, cdb, cmd); | |
a1d8b49a | 2593 | cmd->t_task_lba = transport_lba_32(cdb); |
c66ac9db NB |
2594 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2595 | break; | |
2596 | case READ_12: | |
2597 | sectors = transport_get_sectors_12(cdb, cmd, §or_ret); | |
2598 | if (sector_ret) | |
2599 | goto out_unsupported_cdb; | |
2600 | size = transport_get_size(sectors, cdb, cmd); | |
a1d8b49a | 2601 | cmd->t_task_lba = transport_lba_32(cdb); |
c66ac9db NB |
2602 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2603 | break; | |
2604 | case READ_16: | |
2605 | sectors = transport_get_sectors_16(cdb, cmd, §or_ret); | |
2606 | if (sector_ret) | |
2607 | goto out_unsupported_cdb; | |
2608 | size = transport_get_size(sectors, cdb, cmd); | |
a1d8b49a | 2609 | cmd->t_task_lba = transport_lba_64(cdb); |
c66ac9db NB |
2610 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2611 | break; | |
2612 | case WRITE_6: | |
2613 | sectors = transport_get_sectors_6(cdb, cmd, §or_ret); | |
2614 | if (sector_ret) | |
2615 | goto out_unsupported_cdb; | |
2616 | size = transport_get_size(sectors, cdb, cmd); | |
a1d8b49a | 2617 | cmd->t_task_lba = transport_lba_21(cdb); |
c66ac9db NB |
2618 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2619 | break; | |
2620 | case WRITE_10: | |
2621 | sectors = transport_get_sectors_10(cdb, cmd, §or_ret); | |
2622 | if (sector_ret) | |
2623 | goto out_unsupported_cdb; | |
2624 | size = transport_get_size(sectors, cdb, cmd); | |
a1d8b49a | 2625 | cmd->t_task_lba = transport_lba_32(cdb); |
2d3a4b51 CH |
2626 | if (cdb[1] & 0x8) |
2627 | cmd->se_cmd_flags |= SCF_FUA; | |
c66ac9db NB |
2628 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2629 | break; | |
2630 | case WRITE_12: | |
2631 | sectors = transport_get_sectors_12(cdb, cmd, §or_ret); | |
2632 | if (sector_ret) | |
2633 | goto out_unsupported_cdb; | |
2634 | size = transport_get_size(sectors, cdb, cmd); | |
a1d8b49a | 2635 | cmd->t_task_lba = transport_lba_32(cdb); |
2d3a4b51 CH |
2636 | if (cdb[1] & 0x8) |
2637 | cmd->se_cmd_flags |= SCF_FUA; | |
c66ac9db NB |
2638 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2639 | break; | |
2640 | case WRITE_16: | |
2641 | sectors = transport_get_sectors_16(cdb, cmd, §or_ret); | |
2642 | if (sector_ret) | |
2643 | goto out_unsupported_cdb; | |
2644 | size = transport_get_size(sectors, cdb, cmd); | |
a1d8b49a | 2645 | cmd->t_task_lba = transport_lba_64(cdb); |
2d3a4b51 CH |
2646 | if (cdb[1] & 0x8) |
2647 | cmd->se_cmd_flags |= SCF_FUA; | |
c66ac9db NB |
2648 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2649 | break; | |
2650 | case XDWRITEREAD_10: | |
2651 | if ((cmd->data_direction != DMA_TO_DEVICE) || | |
33c3fafc | 2652 | !(cmd->se_cmd_flags & SCF_BIDI)) |
c66ac9db NB |
2653 | goto out_invalid_cdb_field; |
2654 | sectors = transport_get_sectors_10(cdb, cmd, §or_ret); | |
2655 | if (sector_ret) | |
2656 | goto out_unsupported_cdb; | |
2657 | size = transport_get_size(sectors, cdb, cmd); | |
a1d8b49a | 2658 | cmd->t_task_lba = transport_lba_32(cdb); |
c66ac9db | 2659 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
7c1c6af3 | 2660 | |
5bda90c8 CH |
2661 | /* |
2662 | * Do now allow BIDI commands for passthrough mode. | |
2663 | */ | |
2664 | if (passthrough) | |
7c1c6af3 | 2665 | goto out_unsupported_cdb; |
5bda90c8 | 2666 | |
c66ac9db | 2667 | /* |
35e0e757 | 2668 | * Setup BIDI XOR callback to be run after I/O completion. |
c66ac9db NB |
2669 | */ |
2670 | cmd->transport_complete_callback = &transport_xor_callback; | |
2d3a4b51 CH |
2671 | if (cdb[1] & 0x8) |
2672 | cmd->se_cmd_flags |= SCF_FUA; | |
c66ac9db NB |
2673 | break; |
2674 | case VARIABLE_LENGTH_CMD: | |
2675 | service_action = get_unaligned_be16(&cdb[8]); | |
c66ac9db NB |
2676 | switch (service_action) { |
2677 | case XDWRITEREAD_32: | |
2678 | sectors = transport_get_sectors_32(cdb, cmd, §or_ret); | |
2679 | if (sector_ret) | |
2680 | goto out_unsupported_cdb; | |
2681 | size = transport_get_size(sectors, cdb, cmd); | |
2682 | /* | |
2683 | * Use WRITE_32 and READ_32 opcodes for the emulated | |
2684 | * XDWRITE_READ_32 logic. | |
2685 | */ | |
a1d8b49a | 2686 | cmd->t_task_lba = transport_lba_64_ext(cdb); |
c66ac9db NB |
2687 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2688 | ||
5bda90c8 CH |
2689 | /* |
2690 | * Do now allow BIDI commands for passthrough mode. | |
2691 | */ | |
c66ac9db | 2692 | if (passthrough) |
7c1c6af3 | 2693 | goto out_unsupported_cdb; |
5bda90c8 | 2694 | |
c66ac9db | 2695 | /* |
35e0e757 CH |
2696 | * Setup BIDI XOR callback to be run during after I/O |
2697 | * completion. | |
c66ac9db NB |
2698 | */ |
2699 | cmd->transport_complete_callback = &transport_xor_callback; | |
2d3a4b51 CH |
2700 | if (cdb[1] & 0x8) |
2701 | cmd->se_cmd_flags |= SCF_FUA; | |
c66ac9db NB |
2702 | break; |
2703 | case WRITE_SAME_32: | |
2704 | sectors = transport_get_sectors_32(cdb, cmd, §or_ret); | |
2705 | if (sector_ret) | |
2706 | goto out_unsupported_cdb; | |
dd3a5ad8 | 2707 | |
6708bb27 | 2708 | if (sectors) |
12850626 | 2709 | size = transport_get_size(1, cdb, cmd); |
6708bb27 AG |
2710 | else { |
2711 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not" | |
2712 | " supported\n"); | |
2713 | goto out_invalid_cdb_field; | |
2714 | } | |
dd3a5ad8 | 2715 | |
a1d8b49a | 2716 | cmd->t_task_lba = get_unaligned_be64(&cdb[12]); |
c66ac9db NB |
2717 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
2718 | ||
706d5860 | 2719 | if (target_check_write_same_discard(&cdb[10], dev) < 0) |
67236c44 | 2720 | goto out_unsupported_cdb; |
5bda90c8 CH |
2721 | if (!passthrough) |
2722 | cmd->execute_task = target_emulate_write_same; | |
c66ac9db NB |
2723 | break; |
2724 | default: | |
6708bb27 | 2725 | pr_err("VARIABLE_LENGTH_CMD service action" |
c66ac9db NB |
2726 | " 0x%04x not supported\n", service_action); |
2727 | goto out_unsupported_cdb; | |
2728 | } | |
2729 | break; | |
e434f1f1 | 2730 | case MAINTENANCE_IN: |
e3d6f909 | 2731 | if (dev->transport->get_device_type(dev) != TYPE_ROM) { |
c66ac9db NB |
2732 | /* MAINTENANCE_IN from SCC-2 */ |
2733 | /* | |
2734 | * Check for emulated MI_REPORT_TARGET_PGS. | |
2735 | */ | |
e76a35d6 CH |
2736 | if (cdb[1] == MI_REPORT_TARGET_PGS && |
2737 | su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) { | |
2738 | cmd->execute_task = | |
2739 | target_emulate_report_target_port_groups; | |
c66ac9db NB |
2740 | } |
2741 | size = (cdb[6] << 24) | (cdb[7] << 16) | | |
2742 | (cdb[8] << 8) | cdb[9]; | |
2743 | } else { | |
2744 | /* GPCMD_SEND_KEY from multi media commands */ | |
2745 | size = (cdb[8] << 8) + cdb[9]; | |
2746 | } | |
05d1c7c0 | 2747 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2748 | break; |
2749 | case MODE_SELECT: | |
2750 | size = cdb[4]; | |
2751 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; | |
2752 | break; | |
2753 | case MODE_SELECT_10: | |
2754 | size = (cdb[7] << 8) + cdb[8]; | |
2755 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; | |
2756 | break; | |
2757 | case MODE_SENSE: | |
2758 | size = cdb[4]; | |
05d1c7c0 | 2759 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
5bda90c8 CH |
2760 | if (!passthrough) |
2761 | cmd->execute_task = target_emulate_modesense; | |
c66ac9db NB |
2762 | break; |
2763 | case MODE_SENSE_10: | |
5bda90c8 CH |
2764 | size = (cdb[7] << 8) + cdb[8]; |
2765 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; | |
2766 | if (!passthrough) | |
2767 | cmd->execute_task = target_emulate_modesense; | |
2768 | break; | |
c66ac9db NB |
2769 | case GPCMD_READ_BUFFER_CAPACITY: |
2770 | case GPCMD_SEND_OPC: | |
2771 | case LOG_SELECT: | |
2772 | case LOG_SENSE: | |
2773 | size = (cdb[7] << 8) + cdb[8]; | |
05d1c7c0 | 2774 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2775 | break; |
2776 | case READ_BLOCK_LIMITS: | |
2777 | size = READ_BLOCK_LEN; | |
05d1c7c0 | 2778 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2779 | break; |
2780 | case GPCMD_GET_CONFIGURATION: | |
2781 | case GPCMD_READ_FORMAT_CAPACITIES: | |
2782 | case GPCMD_READ_DISC_INFO: | |
2783 | case GPCMD_READ_TRACK_RZONE_INFO: | |
2784 | size = (cdb[7] << 8) + cdb[8]; | |
2785 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; | |
2786 | break; | |
2787 | case PERSISTENT_RESERVE_IN: | |
617c0e06 | 2788 | if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS) |
e76a35d6 | 2789 | cmd->execute_task = target_scsi3_emulate_pr_in; |
617c0e06 CH |
2790 | size = (cdb[7] << 8) + cdb[8]; |
2791 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; | |
2792 | break; | |
c66ac9db | 2793 | case PERSISTENT_RESERVE_OUT: |
617c0e06 | 2794 | if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS) |
e76a35d6 | 2795 | cmd->execute_task = target_scsi3_emulate_pr_out; |
c66ac9db | 2796 | size = (cdb[7] << 8) + cdb[8]; |
05d1c7c0 | 2797 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2798 | break; |
2799 | case GPCMD_MECHANISM_STATUS: | |
2800 | case GPCMD_READ_DVD_STRUCTURE: | |
2801 | size = (cdb[8] << 8) + cdb[9]; | |
2802 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; | |
2803 | break; | |
2804 | case READ_POSITION: | |
2805 | size = READ_POSITION_LEN; | |
05d1c7c0 | 2806 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db | 2807 | break; |
e434f1f1 | 2808 | case MAINTENANCE_OUT: |
e3d6f909 | 2809 | if (dev->transport->get_device_type(dev) != TYPE_ROM) { |
c66ac9db NB |
2810 | /* MAINTENANCE_OUT from SCC-2 |
2811 | * | |
2812 | * Check for emulated MO_SET_TARGET_PGS. | |
2813 | */ | |
e76a35d6 CH |
2814 | if (cdb[1] == MO_SET_TARGET_PGS && |
2815 | su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) { | |
2816 | cmd->execute_task = | |
2817 | target_emulate_set_target_port_groups; | |
c66ac9db NB |
2818 | } |
2819 | ||
2820 | size = (cdb[6] << 24) | (cdb[7] << 16) | | |
2821 | (cdb[8] << 8) | cdb[9]; | |
2822 | } else { | |
2823 | /* GPCMD_REPORT_KEY from multi media commands */ | |
2824 | size = (cdb[8] << 8) + cdb[9]; | |
2825 | } | |
05d1c7c0 | 2826 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2827 | break; |
2828 | case INQUIRY: | |
2829 | size = (cdb[3] << 8) + cdb[4]; | |
2830 | /* | |
2831 | * Do implict HEAD_OF_QUEUE processing for INQUIRY. | |
2832 | * See spc4r17 section 5.3 | |
2833 | */ | |
5951146d | 2834 | if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) |
e66ecd50 | 2835 | cmd->sam_task_attr = MSG_HEAD_TAG; |
05d1c7c0 | 2836 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
5bda90c8 CH |
2837 | if (!passthrough) |
2838 | cmd->execute_task = target_emulate_inquiry; | |
c66ac9db NB |
2839 | break; |
2840 | case READ_BUFFER: | |
2841 | size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8]; | |
05d1c7c0 | 2842 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2843 | break; |
2844 | case READ_CAPACITY: | |
2845 | size = READ_CAP_LEN; | |
05d1c7c0 | 2846 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
5bda90c8 CH |
2847 | if (!passthrough) |
2848 | cmd->execute_task = target_emulate_readcapacity; | |
c66ac9db NB |
2849 | break; |
2850 | case READ_MEDIA_SERIAL_NUMBER: | |
2851 | case SECURITY_PROTOCOL_IN: | |
2852 | case SECURITY_PROTOCOL_OUT: | |
2853 | size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; | |
05d1c7c0 | 2854 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2855 | break; |
2856 | case SERVICE_ACTION_IN: | |
5bda90c8 CH |
2857 | switch (cmd->t_task_cdb[1] & 0x1f) { |
2858 | case SAI_READ_CAPACITY_16: | |
2859 | if (!passthrough) | |
2860 | cmd->execute_task = | |
2861 | target_emulate_readcapacity_16; | |
2862 | break; | |
2863 | default: | |
2864 | if (passthrough) | |
2865 | break; | |
2866 | ||
2867 | pr_err("Unsupported SA: 0x%02x\n", | |
2868 | cmd->t_task_cdb[1] & 0x1f); | |
2869 | goto out_unsupported_cdb; | |
2870 | } | |
2871 | /*FALLTHROUGH*/ | |
c66ac9db NB |
2872 | case ACCESS_CONTROL_IN: |
2873 | case ACCESS_CONTROL_OUT: | |
2874 | case EXTENDED_COPY: | |
2875 | case READ_ATTRIBUTE: | |
2876 | case RECEIVE_COPY_RESULTS: | |
2877 | case WRITE_ATTRIBUTE: | |
2878 | size = (cdb[10] << 24) | (cdb[11] << 16) | | |
2879 | (cdb[12] << 8) | cdb[13]; | |
05d1c7c0 | 2880 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2881 | break; |
2882 | case RECEIVE_DIAGNOSTIC: | |
2883 | case SEND_DIAGNOSTIC: | |
2884 | size = (cdb[3] << 8) | cdb[4]; | |
05d1c7c0 | 2885 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2886 | break; |
2887 | /* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */ | |
2888 | #if 0 | |
2889 | case GPCMD_READ_CD: | |
2890 | sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8]; | |
2891 | size = (2336 * sectors); | |
05d1c7c0 | 2892 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2893 | break; |
2894 | #endif | |
2895 | case READ_TOC: | |
2896 | size = cdb[8]; | |
05d1c7c0 | 2897 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2898 | break; |
2899 | case REQUEST_SENSE: | |
2900 | size = cdb[4]; | |
05d1c7c0 | 2901 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
5bda90c8 CH |
2902 | if (!passthrough) |
2903 | cmd->execute_task = target_emulate_request_sense; | |
c66ac9db NB |
2904 | break; |
2905 | case READ_ELEMENT_STATUS: | |
2906 | size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9]; | |
05d1c7c0 | 2907 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2908 | break; |
2909 | case WRITE_BUFFER: | |
2910 | size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8]; | |
05d1c7c0 | 2911 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2912 | break; |
2913 | case RESERVE: | |
2914 | case RESERVE_10: | |
2915 | /* | |
2916 | * The SPC-2 RESERVE does not contain a size in the SCSI CDB. | |
2917 | * Assume the passthrough or $FABRIC_MOD will tell us about it. | |
2918 | */ | |
2919 | if (cdb[0] == RESERVE_10) | |
2920 | size = (cdb[7] << 8) | cdb[8]; | |
2921 | else | |
2922 | size = cmd->data_length; | |
2923 | ||
2924 | /* | |
2925 | * Setup the legacy emulated handler for SPC-2 and | |
2926 | * >= SPC-3 compatible reservation handling (CRH=1) | |
2927 | * Otherwise, we assume the underlying SCSI logic is | |
2928 | * is running in SPC_PASSTHROUGH, and wants reservations | |
2929 | * emulation disabled. | |
2930 | */ | |
e76a35d6 CH |
2931 | if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH) |
2932 | cmd->execute_task = target_scsi2_reservation_reserve; | |
c66ac9db NB |
2933 | cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB; |
2934 | break; | |
2935 | case RELEASE: | |
2936 | case RELEASE_10: | |
2937 | /* | |
2938 | * The SPC-2 RELEASE does not contain a size in the SCSI CDB. | |
2939 | * Assume the passthrough or $FABRIC_MOD will tell us about it. | |
2940 | */ | |
2941 | if (cdb[0] == RELEASE_10) | |
2942 | size = (cdb[7] << 8) | cdb[8]; | |
2943 | else | |
2944 | size = cmd->data_length; | |
2945 | ||
e76a35d6 CH |
2946 | if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH) |
2947 | cmd->execute_task = target_scsi2_reservation_release; | |
c66ac9db NB |
2948 | cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB; |
2949 | break; | |
2950 | case SYNCHRONIZE_CACHE: | |
8e94b8db | 2951 | case SYNCHRONIZE_CACHE_16: |
c66ac9db NB |
2952 | /* |
2953 | * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE | |
2954 | */ | |
2955 | if (cdb[0] == SYNCHRONIZE_CACHE) { | |
2956 | sectors = transport_get_sectors_10(cdb, cmd, §or_ret); | |
a1d8b49a | 2957 | cmd->t_task_lba = transport_lba_32(cdb); |
c66ac9db NB |
2958 | } else { |
2959 | sectors = transport_get_sectors_16(cdb, cmd, §or_ret); | |
a1d8b49a | 2960 | cmd->t_task_lba = transport_lba_64(cdb); |
c66ac9db NB |
2961 | } |
2962 | if (sector_ret) | |
2963 | goto out_unsupported_cdb; | |
2964 | ||
2965 | size = transport_get_size(sectors, cdb, cmd); | |
2966 | cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB; | |
2967 | ||
5bda90c8 | 2968 | if (passthrough) |
c66ac9db | 2969 | break; |
5bda90c8 | 2970 | |
c66ac9db NB |
2971 | /* |
2972 | * Check to ensure that LBA + Range does not exceed past end of | |
7abbe7f3 | 2973 | * device for IBLOCK and FILEIO ->do_sync_cache() backend calls |
c66ac9db | 2974 | */ |
7abbe7f3 NB |
2975 | if ((cmd->t_task_lba != 0) || (sectors != 0)) { |
2976 | if (transport_cmd_get_valid_sectors(cmd) < 0) | |
2977 | goto out_invalid_cdb_field; | |
2978 | } | |
5bda90c8 | 2979 | cmd->execute_task = target_emulate_synchronize_cache; |
c66ac9db NB |
2980 | break; |
2981 | case UNMAP: | |
2982 | size = get_unaligned_be16(&cdb[7]); | |
05d1c7c0 | 2983 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
5bda90c8 CH |
2984 | if (!passthrough) |
2985 | cmd->execute_task = target_emulate_unmap; | |
c66ac9db NB |
2986 | break; |
2987 | case WRITE_SAME_16: | |
2988 | sectors = transport_get_sectors_16(cdb, cmd, §or_ret); | |
2989 | if (sector_ret) | |
2990 | goto out_unsupported_cdb; | |
dd3a5ad8 | 2991 | |
6708bb27 | 2992 | if (sectors) |
12850626 | 2993 | size = transport_get_size(1, cdb, cmd); |
6708bb27 AG |
2994 | else { |
2995 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); | |
2996 | goto out_invalid_cdb_field; | |
2997 | } | |
dd3a5ad8 | 2998 | |
5db0753b | 2999 | cmd->t_task_lba = get_unaligned_be64(&cdb[2]); |
706d5860 NB |
3000 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
3001 | ||
3002 | if (target_check_write_same_discard(&cdb[1], dev) < 0) | |
67236c44 | 3003 | goto out_unsupported_cdb; |
5bda90c8 CH |
3004 | if (!passthrough) |
3005 | cmd->execute_task = target_emulate_write_same; | |
706d5860 NB |
3006 | break; |
3007 | case WRITE_SAME: | |
3008 | sectors = transport_get_sectors_10(cdb, cmd, §or_ret); | |
3009 | if (sector_ret) | |
3010 | goto out_unsupported_cdb; | |
3011 | ||
3012 | if (sectors) | |
12850626 | 3013 | size = transport_get_size(1, cdb, cmd); |
706d5860 NB |
3014 | else { |
3015 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); | |
3016 | goto out_invalid_cdb_field; | |
c66ac9db | 3017 | } |
706d5860 NB |
3018 | |
3019 | cmd->t_task_lba = get_unaligned_be32(&cdb[2]); | |
c66ac9db | 3020 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
706d5860 NB |
3021 | /* |
3022 | * Follow sbcr26 with WRITE_SAME (10) and check for the existence | |
3023 | * of byte 1 bit 3 UNMAP instead of original reserved field | |
3024 | */ | |
3025 | if (target_check_write_same_discard(&cdb[1], dev) < 0) | |
67236c44 | 3026 | goto out_unsupported_cdb; |
5bda90c8 CH |
3027 | if (!passthrough) |
3028 | cmd->execute_task = target_emulate_write_same; | |
c66ac9db NB |
3029 | break; |
3030 | case ALLOW_MEDIUM_REMOVAL: | |
c66ac9db | 3031 | case ERASE: |
c66ac9db NB |
3032 | case REZERO_UNIT: |
3033 | case SEEK_10: | |
c66ac9db NB |
3034 | case SPACE: |
3035 | case START_STOP: | |
3036 | case TEST_UNIT_READY: | |
3037 | case VERIFY: | |
3038 | case WRITE_FILEMARKS: | |
5bda90c8 CH |
3039 | cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB; |
3040 | if (!passthrough) | |
3041 | cmd->execute_task = target_emulate_noop; | |
3042 | break; | |
3043 | case GPCMD_CLOSE_TRACK: | |
3044 | case INITIALIZE_ELEMENT_STATUS: | |
3045 | case GPCMD_LOAD_UNLOAD: | |
3046 | case GPCMD_SET_SPEED: | |
c66ac9db NB |
3047 | case MOVE_MEDIUM: |
3048 | cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB; | |
3049 | break; | |
3050 | case REPORT_LUNS: | |
e76a35d6 | 3051 | cmd->execute_task = target_report_luns; |
c66ac9db NB |
3052 | size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; |
3053 | /* | |
3054 | * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS | |
3055 | * See spc4r17 section 5.3 | |
3056 | */ | |
5951146d | 3057 | if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) |
e66ecd50 | 3058 | cmd->sam_task_attr = MSG_HEAD_TAG; |
05d1c7c0 | 3059 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
3060 | break; |
3061 | default: | |
6708bb27 | 3062 | pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode" |
c66ac9db | 3063 | " 0x%02x, sending CHECK_CONDITION.\n", |
e3d6f909 | 3064 | cmd->se_tfo->get_fabric_name(), cdb[0]); |
c66ac9db NB |
3065 | goto out_unsupported_cdb; |
3066 | } | |
3067 | ||
3068 | if (size != cmd->data_length) { | |
6708bb27 | 3069 | pr_warn("TARGET_CORE[%s]: Expected Transfer Length:" |
c66ac9db | 3070 | " %u does not match SCSI CDB Length: %u for SAM Opcode:" |
e3d6f909 | 3071 | " 0x%02x\n", cmd->se_tfo->get_fabric_name(), |
c66ac9db NB |
3072 | cmd->data_length, size, cdb[0]); |
3073 | ||
3074 | cmd->cmd_spdtl = size; | |
3075 | ||
3076 | if (cmd->data_direction == DMA_TO_DEVICE) { | |
6708bb27 | 3077 | pr_err("Rejecting underflow/overflow" |
c66ac9db NB |
3078 | " WRITE data\n"); |
3079 | goto out_invalid_cdb_field; | |
3080 | } | |
3081 | /* | |
3082 | * Reject READ_* or WRITE_* with overflow/underflow for | |
3083 | * type SCF_SCSI_DATA_SG_IO_CDB. | |
3084 | */ | |
6708bb27 AG |
3085 | if (!ret && (dev->se_sub_dev->se_dev_attrib.block_size != 512)) { |
3086 | pr_err("Failing OVERFLOW/UNDERFLOW for LBA op" | |
c66ac9db | 3087 | " CDB on non 512-byte sector setup subsystem" |
e3d6f909 | 3088 | " plugin: %s\n", dev->transport->name); |
c66ac9db NB |
3089 | /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */ |
3090 | goto out_invalid_cdb_field; | |
3091 | } | |
3092 | ||
3093 | if (size > cmd->data_length) { | |
3094 | cmd->se_cmd_flags |= SCF_OVERFLOW_BIT; | |
3095 | cmd->residual_count = (size - cmd->data_length); | |
3096 | } else { | |
3097 | cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT; | |
3098 | cmd->residual_count = (cmd->data_length - size); | |
3099 | } | |
3100 | cmd->data_length = size; | |
3101 | } | |
3102 | ||
5bda90c8 CH |
3103 | /* reject any command that we don't have a handler for */ |
3104 | if (!(passthrough || cmd->execute_task || | |
3105 | (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB))) | |
3106 | goto out_unsupported_cdb; | |
3107 | ||
c66ac9db NB |
3108 | transport_set_supported_SAM_opcode(cmd); |
3109 | return ret; | |
3110 | ||
3111 | out_unsupported_cdb: | |
3112 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
3113 | cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; | |
5951146d | 3114 | return -EINVAL; |
c66ac9db NB |
3115 | out_invalid_cdb_field: |
3116 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
3117 | cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; | |
5951146d | 3118 | return -EINVAL; |
c66ac9db NB |
3119 | } |
3120 | ||
c66ac9db | 3121 | /* |
35e0e757 | 3122 | * Called from I/O completion to determine which dormant/delayed |
c66ac9db NB |
3123 | * and ordered cmds need to have their tasks added to the execution queue. |
3124 | */ | |
3125 | static void transport_complete_task_attr(struct se_cmd *cmd) | |
3126 | { | |
5951146d | 3127 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
3128 | struct se_cmd *cmd_p, *cmd_tmp; |
3129 | int new_active_tasks = 0; | |
3130 | ||
e66ecd50 | 3131 | if (cmd->sam_task_attr == MSG_SIMPLE_TAG) { |
c66ac9db NB |
3132 | atomic_dec(&dev->simple_cmds); |
3133 | smp_mb__after_atomic_dec(); | |
3134 | dev->dev_cur_ordered_id++; | |
6708bb27 | 3135 | pr_debug("Incremented dev->dev_cur_ordered_id: %u for" |
c66ac9db NB |
3136 | " SIMPLE: %u\n", dev->dev_cur_ordered_id, |
3137 | cmd->se_ordered_id); | |
e66ecd50 | 3138 | } else if (cmd->sam_task_attr == MSG_HEAD_TAG) { |
c66ac9db | 3139 | dev->dev_cur_ordered_id++; |
6708bb27 | 3140 | pr_debug("Incremented dev_cur_ordered_id: %u for" |
c66ac9db NB |
3141 | " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id, |
3142 | cmd->se_ordered_id); | |
e66ecd50 | 3143 | } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) { |
c66ac9db NB |
3144 | atomic_dec(&dev->dev_ordered_sync); |
3145 | smp_mb__after_atomic_dec(); | |
c66ac9db NB |
3146 | |
3147 | dev->dev_cur_ordered_id++; | |
6708bb27 | 3148 | pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:" |
c66ac9db NB |
3149 | " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id); |
3150 | } | |
3151 | /* | |
3152 | * Process all commands up to the last received | |
3153 | * ORDERED task attribute which requires another blocking | |
3154 | * boundary | |
3155 | */ | |
3156 | spin_lock(&dev->delayed_cmd_lock); | |
3157 | list_for_each_entry_safe(cmd_p, cmd_tmp, | |
5951146d | 3158 | &dev->delayed_cmd_list, se_delayed_node) { |
c66ac9db | 3159 | |
5951146d | 3160 | list_del(&cmd_p->se_delayed_node); |
c66ac9db NB |
3161 | spin_unlock(&dev->delayed_cmd_lock); |
3162 | ||
6708bb27 | 3163 | pr_debug("Calling add_tasks() for" |
c66ac9db NB |
3164 | " cmd_p: 0x%02x Task Attr: 0x%02x" |
3165 | " Dormant -> Active, se_ordered_id: %u\n", | |
6708bb27 | 3166 | cmd_p->t_task_cdb[0], |
c66ac9db NB |
3167 | cmd_p->sam_task_attr, cmd_p->se_ordered_id); |
3168 | ||
3169 | transport_add_tasks_from_cmd(cmd_p); | |
3170 | new_active_tasks++; | |
3171 | ||
3172 | spin_lock(&dev->delayed_cmd_lock); | |
e66ecd50 | 3173 | if (cmd_p->sam_task_attr == MSG_ORDERED_TAG) |
c66ac9db NB |
3174 | break; |
3175 | } | |
3176 | spin_unlock(&dev->delayed_cmd_lock); | |
3177 | /* | |
3178 | * If new tasks have become active, wake up the transport thread | |
3179 | * to do the processing of the Active tasks. | |
3180 | */ | |
3181 | if (new_active_tasks != 0) | |
e3d6f909 | 3182 | wake_up_interruptible(&dev->dev_queue_obj.thread_wq); |
c66ac9db NB |
3183 | } |
3184 | ||
e057f533 | 3185 | static void transport_complete_qf(struct se_cmd *cmd) |
07bde79a NB |
3186 | { |
3187 | int ret = 0; | |
3188 | ||
e057f533 CH |
3189 | if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) |
3190 | transport_complete_task_attr(cmd); | |
3191 | ||
3192 | if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) { | |
3193 | ret = cmd->se_tfo->queue_status(cmd); | |
3194 | if (ret) | |
3195 | goto out; | |
3196 | } | |
07bde79a NB |
3197 | |
3198 | switch (cmd->data_direction) { | |
3199 | case DMA_FROM_DEVICE: | |
3200 | ret = cmd->se_tfo->queue_data_in(cmd); | |
3201 | break; | |
3202 | case DMA_TO_DEVICE: | |
ec98f782 | 3203 | if (cmd->t_bidi_data_sg) { |
07bde79a NB |
3204 | ret = cmd->se_tfo->queue_data_in(cmd); |
3205 | if (ret < 0) | |
e057f533 | 3206 | break; |
07bde79a NB |
3207 | } |
3208 | /* Fall through for DMA_TO_DEVICE */ | |
3209 | case DMA_NONE: | |
3210 | ret = cmd->se_tfo->queue_status(cmd); | |
3211 | break; | |
3212 | default: | |
3213 | break; | |
3214 | } | |
3215 | ||
e057f533 CH |
3216 | out: |
3217 | if (ret < 0) { | |
3218 | transport_handle_queue_full(cmd, cmd->se_dev); | |
3219 | return; | |
3220 | } | |
3221 | transport_lun_remove_cmd(cmd); | |
3222 | transport_cmd_check_stop_to_fabric(cmd); | |
07bde79a NB |
3223 | } |
3224 | ||
3225 | static void transport_handle_queue_full( | |
3226 | struct se_cmd *cmd, | |
e057f533 | 3227 | struct se_device *dev) |
07bde79a NB |
3228 | { |
3229 | spin_lock_irq(&dev->qf_cmd_lock); | |
07bde79a NB |
3230 | list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list); |
3231 | atomic_inc(&dev->dev_qf_count); | |
3232 | smp_mb__after_atomic_inc(); | |
3233 | spin_unlock_irq(&cmd->se_dev->qf_cmd_lock); | |
3234 | ||
3235 | schedule_work(&cmd->se_dev->qf_work_queue); | |
3236 | } | |
3237 | ||
35e0e757 | 3238 | static void target_complete_ok_work(struct work_struct *work) |
c66ac9db | 3239 | { |
35e0e757 | 3240 | struct se_cmd *cmd = container_of(work, struct se_cmd, work); |
07bde79a | 3241 | int reason = 0, ret; |
35e0e757 | 3242 | |
c66ac9db NB |
3243 | /* |
3244 | * Check if we need to move delayed/dormant tasks from cmds on the | |
3245 | * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task | |
3246 | * Attribute. | |
3247 | */ | |
5951146d | 3248 | if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) |
c66ac9db | 3249 | transport_complete_task_attr(cmd); |
07bde79a NB |
3250 | /* |
3251 | * Check to schedule QUEUE_FULL work, or execute an existing | |
3252 | * cmd->transport_qf_callback() | |
3253 | */ | |
3254 | if (atomic_read(&cmd->se_dev->dev_qf_count) != 0) | |
3255 | schedule_work(&cmd->se_dev->qf_work_queue); | |
3256 | ||
c66ac9db NB |
3257 | /* |
3258 | * Check if we need to retrieve a sense buffer from | |
3259 | * the struct se_cmd in question. | |
3260 | */ | |
3261 | if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) { | |
3262 | if (transport_get_sense_data(cmd) < 0) | |
3263 | reason = TCM_NON_EXISTENT_LUN; | |
3264 | ||
3265 | /* | |
3266 | * Only set when an struct se_task->task_scsi_status returned | |
3267 | * a non GOOD status. | |
3268 | */ | |
3269 | if (cmd->scsi_status) { | |
07bde79a | 3270 | ret = transport_send_check_condition_and_sense( |
c66ac9db | 3271 | cmd, reason, 1); |
f147abb4 | 3272 | if (ret == -EAGAIN || ret == -ENOMEM) |
07bde79a NB |
3273 | goto queue_full; |
3274 | ||
c66ac9db NB |
3275 | transport_lun_remove_cmd(cmd); |
3276 | transport_cmd_check_stop_to_fabric(cmd); | |
3277 | return; | |
3278 | } | |
3279 | } | |
3280 | /* | |
25985edc | 3281 | * Check for a callback, used by amongst other things |
c66ac9db NB |
3282 | * XDWRITE_READ_10 emulation. |
3283 | */ | |
3284 | if (cmd->transport_complete_callback) | |
3285 | cmd->transport_complete_callback(cmd); | |
3286 | ||
3287 | switch (cmd->data_direction) { | |
3288 | case DMA_FROM_DEVICE: | |
3289 | spin_lock(&cmd->se_lun->lun_sep_lock); | |
e3d6f909 AG |
3290 | if (cmd->se_lun->lun_sep) { |
3291 | cmd->se_lun->lun_sep->sep_stats.tx_data_octets += | |
c66ac9db NB |
3292 | cmd->data_length; |
3293 | } | |
3294 | spin_unlock(&cmd->se_lun->lun_sep_lock); | |
c66ac9db | 3295 | |
07bde79a | 3296 | ret = cmd->se_tfo->queue_data_in(cmd); |
f147abb4 | 3297 | if (ret == -EAGAIN || ret == -ENOMEM) |
07bde79a | 3298 | goto queue_full; |
c66ac9db NB |
3299 | break; |
3300 | case DMA_TO_DEVICE: | |
3301 | spin_lock(&cmd->se_lun->lun_sep_lock); | |
e3d6f909 AG |
3302 | if (cmd->se_lun->lun_sep) { |
3303 | cmd->se_lun->lun_sep->sep_stats.rx_data_octets += | |
c66ac9db NB |
3304 | cmd->data_length; |
3305 | } | |
3306 | spin_unlock(&cmd->se_lun->lun_sep_lock); | |
3307 | /* | |
3308 | * Check if we need to send READ payload for BIDI-COMMAND | |
3309 | */ | |
ec98f782 | 3310 | if (cmd->t_bidi_data_sg) { |
c66ac9db | 3311 | spin_lock(&cmd->se_lun->lun_sep_lock); |
e3d6f909 AG |
3312 | if (cmd->se_lun->lun_sep) { |
3313 | cmd->se_lun->lun_sep->sep_stats.tx_data_octets += | |
c66ac9db NB |
3314 | cmd->data_length; |
3315 | } | |
3316 | spin_unlock(&cmd->se_lun->lun_sep_lock); | |
07bde79a | 3317 | ret = cmd->se_tfo->queue_data_in(cmd); |
f147abb4 | 3318 | if (ret == -EAGAIN || ret == -ENOMEM) |
07bde79a | 3319 | goto queue_full; |
c66ac9db NB |
3320 | break; |
3321 | } | |
3322 | /* Fall through for DMA_TO_DEVICE */ | |
3323 | case DMA_NONE: | |
07bde79a | 3324 | ret = cmd->se_tfo->queue_status(cmd); |
f147abb4 | 3325 | if (ret == -EAGAIN || ret == -ENOMEM) |
07bde79a | 3326 | goto queue_full; |
c66ac9db NB |
3327 | break; |
3328 | default: | |
3329 | break; | |
3330 | } | |
3331 | ||
3332 | transport_lun_remove_cmd(cmd); | |
3333 | transport_cmd_check_stop_to_fabric(cmd); | |
07bde79a NB |
3334 | return; |
3335 | ||
3336 | queue_full: | |
6708bb27 | 3337 | pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p," |
07bde79a | 3338 | " data_direction: %d\n", cmd, cmd->data_direction); |
e057f533 CH |
3339 | cmd->t_state = TRANSPORT_COMPLETE_QF_OK; |
3340 | transport_handle_queue_full(cmd, cmd->se_dev); | |
c66ac9db NB |
3341 | } |
3342 | ||
3343 | static void transport_free_dev_tasks(struct se_cmd *cmd) | |
3344 | { | |
3345 | struct se_task *task, *task_tmp; | |
3346 | unsigned long flags; | |
0c2cfe5f | 3347 | LIST_HEAD(dispose_list); |
c66ac9db | 3348 | |
a1d8b49a | 3349 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 3350 | list_for_each_entry_safe(task, task_tmp, |
a1d8b49a | 3351 | &cmd->t_task_list, t_list) { |
0c2cfe5f CH |
3352 | if (!(task->task_flags & TF_ACTIVE)) |
3353 | list_move_tail(&task->t_list, &dispose_list); | |
3354 | } | |
3355 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
3356 | ||
3357 | while (!list_empty(&dispose_list)) { | |
3358 | task = list_first_entry(&dispose_list, struct se_task, t_list); | |
c66ac9db | 3359 | |
af3f00c7 CH |
3360 | if (task->task_sg != cmd->t_data_sg && |
3361 | task->task_sg != cmd->t_bidi_data_sg) | |
3362 | kfree(task->task_sg); | |
c66ac9db NB |
3363 | |
3364 | list_del(&task->t_list); | |
3365 | ||
42bf829e | 3366 | cmd->se_dev->transport->free_task(task); |
c66ac9db | 3367 | } |
c66ac9db NB |
3368 | } |
3369 | ||
6708bb27 | 3370 | static inline void transport_free_sgl(struct scatterlist *sgl, int nents) |
c66ac9db | 3371 | { |
ec98f782 | 3372 | struct scatterlist *sg; |
ec98f782 | 3373 | int count; |
c66ac9db | 3374 | |
6708bb27 AG |
3375 | for_each_sg(sgl, sg, nents, count) |
3376 | __free_page(sg_page(sg)); | |
c66ac9db | 3377 | |
6708bb27 AG |
3378 | kfree(sgl); |
3379 | } | |
c66ac9db | 3380 | |
6708bb27 AG |
3381 | static inline void transport_free_pages(struct se_cmd *cmd) |
3382 | { | |
3383 | if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) | |
3384 | return; | |
3385 | ||
3386 | transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents); | |
ec98f782 AG |
3387 | cmd->t_data_sg = NULL; |
3388 | cmd->t_data_nents = 0; | |
c66ac9db | 3389 | |
6708bb27 | 3390 | transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents); |
ec98f782 AG |
3391 | cmd->t_bidi_data_sg = NULL; |
3392 | cmd->t_bidi_data_nents = 0; | |
c66ac9db NB |
3393 | } |
3394 | ||
e26d99ae CH |
3395 | /** |
3396 | * transport_release_cmd - free a command | |
3397 | * @cmd: command to free | |
3398 | * | |
3399 | * This routine unconditionally frees a command, and reference counting | |
3400 | * or list removal must be done in the caller. | |
3401 | */ | |
3402 | static void transport_release_cmd(struct se_cmd *cmd) | |
3403 | { | |
3404 | BUG_ON(!cmd->se_tfo); | |
3405 | ||
c8e31f26 | 3406 | if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB) |
e26d99ae CH |
3407 | core_tmr_release_req(cmd->se_tmr_req); |
3408 | if (cmd->t_task_cdb != cmd->__t_task_cdb) | |
3409 | kfree(cmd->t_task_cdb); | |
3410 | /* | |
7481deb4 NB |
3411 | * If this cmd has been setup with target_get_sess_cmd(), drop |
3412 | * the kref and call ->release_cmd() in kref callback. | |
e26d99ae | 3413 | */ |
7481deb4 NB |
3414 | if (cmd->check_release != 0) { |
3415 | target_put_sess_cmd(cmd->se_sess, cmd); | |
3416 | return; | |
3417 | } | |
e26d99ae CH |
3418 | cmd->se_tfo->release_cmd(cmd); |
3419 | } | |
3420 | ||
d3df7825 CH |
3421 | /** |
3422 | * transport_put_cmd - release a reference to a command | |
3423 | * @cmd: command to release | |
3424 | * | |
3425 | * This routine releases our reference to the command and frees it if possible. | |
3426 | */ | |
39c05f32 | 3427 | static void transport_put_cmd(struct se_cmd *cmd) |
c66ac9db NB |
3428 | { |
3429 | unsigned long flags; | |
4911e3cc | 3430 | int free_tasks = 0; |
c66ac9db | 3431 | |
a1d8b49a | 3432 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
4911e3cc CH |
3433 | if (atomic_read(&cmd->t_fe_count)) { |
3434 | if (!atomic_dec_and_test(&cmd->t_fe_count)) | |
3435 | goto out_busy; | |
3436 | } | |
3437 | ||
3438 | if (atomic_read(&cmd->t_se_count)) { | |
3439 | if (!atomic_dec_and_test(&cmd->t_se_count)) | |
3440 | goto out_busy; | |
3441 | } | |
3442 | ||
7d680f3b CH |
3443 | if (cmd->transport_state & CMD_T_DEV_ACTIVE) { |
3444 | cmd->transport_state &= ~CMD_T_DEV_ACTIVE; | |
4911e3cc CH |
3445 | transport_all_task_dev_remove_state(cmd); |
3446 | free_tasks = 1; | |
c66ac9db | 3447 | } |
a1d8b49a | 3448 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 3449 | |
4911e3cc CH |
3450 | if (free_tasks != 0) |
3451 | transport_free_dev_tasks(cmd); | |
d3df7825 | 3452 | |
c66ac9db | 3453 | transport_free_pages(cmd); |
31afc39c | 3454 | transport_release_cmd(cmd); |
39c05f32 | 3455 | return; |
4911e3cc CH |
3456 | out_busy: |
3457 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
c66ac9db NB |
3458 | } |
3459 | ||
c66ac9db | 3460 | /* |
ec98f782 AG |
3461 | * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of |
3462 | * allocating in the core. | |
c66ac9db NB |
3463 | * @cmd: Associated se_cmd descriptor |
3464 | * @mem: SGL style memory for TCM WRITE / READ | |
3465 | * @sg_mem_num: Number of SGL elements | |
3466 | * @mem_bidi_in: SGL style memory for TCM BIDI READ | |
3467 | * @sg_mem_bidi_num: Number of BIDI READ SGL elements | |
3468 | * | |
3469 | * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage | |
3470 | * of parameters. | |
3471 | */ | |
3472 | int transport_generic_map_mem_to_cmd( | |
3473 | struct se_cmd *cmd, | |
5951146d AG |
3474 | struct scatterlist *sgl, |
3475 | u32 sgl_count, | |
3476 | struct scatterlist *sgl_bidi, | |
3477 | u32 sgl_bidi_count) | |
c66ac9db | 3478 | { |
5951146d | 3479 | if (!sgl || !sgl_count) |
c66ac9db | 3480 | return 0; |
c66ac9db | 3481 | |
c66ac9db NB |
3482 | if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) || |
3483 | (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) { | |
fef58a60 NB |
3484 | /* |
3485 | * Reject SCSI data overflow with map_mem_to_cmd() as incoming | |
3486 | * scatterlists already have been set to follow what the fabric | |
3487 | * passes for the original expected data transfer length. | |
3488 | */ | |
3489 | if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) { | |
3490 | pr_warn("Rejecting SCSI DATA overflow for fabric using" | |
3491 | " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n"); | |
3492 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
3493 | cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; | |
3494 | return -EINVAL; | |
3495 | } | |
c66ac9db | 3496 | |
ec98f782 AG |
3497 | cmd->t_data_sg = sgl; |
3498 | cmd->t_data_nents = sgl_count; | |
c66ac9db | 3499 | |
ec98f782 AG |
3500 | if (sgl_bidi && sgl_bidi_count) { |
3501 | cmd->t_bidi_data_sg = sgl_bidi; | |
3502 | cmd->t_bidi_data_nents = sgl_bidi_count; | |
c66ac9db NB |
3503 | } |
3504 | cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC; | |
c66ac9db NB |
3505 | } |
3506 | ||
3507 | return 0; | |
3508 | } | |
3509 | EXPORT_SYMBOL(transport_generic_map_mem_to_cmd); | |
3510 | ||
4949314c | 3511 | void *transport_kmap_data_sg(struct se_cmd *cmd) |
05d1c7c0 | 3512 | { |
ec98f782 | 3513 | struct scatterlist *sg = cmd->t_data_sg; |
4949314c AG |
3514 | struct page **pages; |
3515 | int i; | |
05d1c7c0 | 3516 | |
ec98f782 | 3517 | BUG_ON(!sg); |
05d1c7c0 | 3518 | /* |
ec98f782 AG |
3519 | * We need to take into account a possible offset here for fabrics like |
3520 | * tcm_loop who may be using a contig buffer from the SCSI midlayer for | |
3521 | * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd() | |
05d1c7c0 | 3522 | */ |
4949314c AG |
3523 | if (!cmd->t_data_nents) |
3524 | return NULL; | |
3525 | else if (cmd->t_data_nents == 1) | |
3526 | return kmap(sg_page(sg)) + sg->offset; | |
3527 | ||
3528 | /* >1 page. use vmap */ | |
3529 | pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL); | |
3530 | if (!pages) | |
3531 | return NULL; | |
3532 | ||
3533 | /* convert sg[] to pages[] */ | |
3534 | for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) { | |
3535 | pages[i] = sg_page(sg); | |
3536 | } | |
3537 | ||
3538 | cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL); | |
3539 | kfree(pages); | |
3540 | if (!cmd->t_data_vmap) | |
3541 | return NULL; | |
3542 | ||
3543 | return cmd->t_data_vmap + cmd->t_data_sg[0].offset; | |
05d1c7c0 | 3544 | } |
4949314c | 3545 | EXPORT_SYMBOL(transport_kmap_data_sg); |
05d1c7c0 | 3546 | |
4949314c | 3547 | void transport_kunmap_data_sg(struct se_cmd *cmd) |
05d1c7c0 | 3548 | { |
a1edf9cf | 3549 | if (!cmd->t_data_nents) { |
4949314c | 3550 | return; |
a1edf9cf | 3551 | } else if (cmd->t_data_nents == 1) { |
4949314c | 3552 | kunmap(sg_page(cmd->t_data_sg)); |
a1edf9cf AG |
3553 | return; |
3554 | } | |
4949314c AG |
3555 | |
3556 | vunmap(cmd->t_data_vmap); | |
3557 | cmd->t_data_vmap = NULL; | |
05d1c7c0 | 3558 | } |
4949314c | 3559 | EXPORT_SYMBOL(transport_kunmap_data_sg); |
05d1c7c0 | 3560 | |
c66ac9db | 3561 | static int |
05d1c7c0 | 3562 | transport_generic_get_mem(struct se_cmd *cmd) |
c66ac9db | 3563 | { |
ec98f782 AG |
3564 | u32 length = cmd->data_length; |
3565 | unsigned int nents; | |
3566 | struct page *page; | |
9db9da33 | 3567 | gfp_t zero_flag; |
ec98f782 | 3568 | int i = 0; |
c66ac9db | 3569 | |
ec98f782 AG |
3570 | nents = DIV_ROUND_UP(length, PAGE_SIZE); |
3571 | cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL); | |
3572 | if (!cmd->t_data_sg) | |
3573 | return -ENOMEM; | |
c66ac9db | 3574 | |
ec98f782 AG |
3575 | cmd->t_data_nents = nents; |
3576 | sg_init_table(cmd->t_data_sg, nents); | |
c66ac9db | 3577 | |
9db9da33 | 3578 | zero_flag = cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB ? 0 : __GFP_ZERO; |
3579 | ||
ec98f782 AG |
3580 | while (length) { |
3581 | u32 page_len = min_t(u32, length, PAGE_SIZE); | |
9db9da33 | 3582 | page = alloc_page(GFP_KERNEL | zero_flag); |
ec98f782 AG |
3583 | if (!page) |
3584 | goto out; | |
c66ac9db | 3585 | |
ec98f782 AG |
3586 | sg_set_page(&cmd->t_data_sg[i], page, page_len, 0); |
3587 | length -= page_len; | |
3588 | i++; | |
c66ac9db | 3589 | } |
c66ac9db | 3590 | return 0; |
c66ac9db | 3591 | |
ec98f782 AG |
3592 | out: |
3593 | while (i >= 0) { | |
3594 | __free_page(sg_page(&cmd->t_data_sg[i])); | |
3595 | i--; | |
c66ac9db | 3596 | } |
ec98f782 AG |
3597 | kfree(cmd->t_data_sg); |
3598 | cmd->t_data_sg = NULL; | |
3599 | return -ENOMEM; | |
c66ac9db NB |
3600 | } |
3601 | ||
a1d8b49a AG |
3602 | /* Reduce sectors if they are too long for the device */ |
3603 | static inline sector_t transport_limit_task_sectors( | |
c66ac9db NB |
3604 | struct se_device *dev, |
3605 | unsigned long long lba, | |
a1d8b49a | 3606 | sector_t sectors) |
c66ac9db | 3607 | { |
a1d8b49a | 3608 | sectors = min_t(sector_t, sectors, dev->se_sub_dev->se_dev_attrib.max_sectors); |
c66ac9db | 3609 | |
a1d8b49a AG |
3610 | if (dev->transport->get_device_type(dev) == TYPE_DISK) |
3611 | if ((lba + sectors) > transport_dev_end_lba(dev)) | |
3612 | sectors = ((transport_dev_end_lba(dev) - lba) + 1); | |
c66ac9db | 3613 | |
a1d8b49a | 3614 | return sectors; |
c66ac9db NB |
3615 | } |
3616 | ||
c66ac9db NB |
3617 | |
3618 | /* | |
3619 | * This function can be used by HW target mode drivers to create a linked | |
3620 | * scatterlist from all contiguously allocated struct se_task->task_sg[]. | |
3621 | * This is intended to be called during the completion path by TCM Core | |
3622 | * when struct target_core_fabric_ops->check_task_sg_chaining is enabled. | |
3623 | */ | |
3624 | void transport_do_task_sg_chain(struct se_cmd *cmd) | |
3625 | { | |
ec98f782 AG |
3626 | struct scatterlist *sg_first = NULL; |
3627 | struct scatterlist *sg_prev = NULL; | |
3628 | int sg_prev_nents = 0; | |
3629 | struct scatterlist *sg; | |
c66ac9db | 3630 | struct se_task *task; |
ec98f782 | 3631 | u32 chained_nents = 0; |
c66ac9db NB |
3632 | int i; |
3633 | ||
ec98f782 AG |
3634 | BUG_ON(!cmd->se_tfo->task_sg_chaining); |
3635 | ||
c66ac9db NB |
3636 | /* |
3637 | * Walk the struct se_task list and setup scatterlist chains | |
a1d8b49a | 3638 | * for each contiguously allocated struct se_task->task_sg[]. |
c66ac9db | 3639 | */ |
a1d8b49a | 3640 | list_for_each_entry(task, &cmd->t_task_list, t_list) { |
ec98f782 | 3641 | if (!task->task_sg) |
c66ac9db NB |
3642 | continue; |
3643 | ||
ec98f782 AG |
3644 | if (!sg_first) { |
3645 | sg_first = task->task_sg; | |
6708bb27 | 3646 | chained_nents = task->task_sg_nents; |
97868c89 | 3647 | } else { |
ec98f782 | 3648 | sg_chain(sg_prev, sg_prev_nents, task->task_sg); |
6708bb27 | 3649 | chained_nents += task->task_sg_nents; |
97868c89 | 3650 | } |
c3c74c7a NB |
3651 | /* |
3652 | * For the padded tasks, use the extra SGL vector allocated | |
3653 | * in transport_allocate_data_tasks() for the sg_prev_nents | |
04629b7b CH |
3654 | * offset into sg_chain() above. |
3655 | * | |
3656 | * We do not need the padding for the last task (or a single | |
3657 | * task), but in that case we will never use the sg_prev_nents | |
3658 | * value below which would be incorrect. | |
c3c74c7a | 3659 | */ |
04629b7b | 3660 | sg_prev_nents = (task->task_sg_nents + 1); |
ec98f782 | 3661 | sg_prev = task->task_sg; |
c66ac9db NB |
3662 | } |
3663 | /* | |
3664 | * Setup the starting pointer and total t_tasks_sg_linked_no including | |
3665 | * padding SGs for linking and to mark the end. | |
3666 | */ | |
a1d8b49a | 3667 | cmd->t_tasks_sg_chained = sg_first; |
ec98f782 | 3668 | cmd->t_tasks_sg_chained_no = chained_nents; |
c66ac9db | 3669 | |
6708bb27 | 3670 | pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and" |
a1d8b49a AG |
3671 | " t_tasks_sg_chained_no: %u\n", cmd, cmd->t_tasks_sg_chained, |
3672 | cmd->t_tasks_sg_chained_no); | |
c66ac9db | 3673 | |
a1d8b49a AG |
3674 | for_each_sg(cmd->t_tasks_sg_chained, sg, |
3675 | cmd->t_tasks_sg_chained_no, i) { | |
c66ac9db | 3676 | |
6708bb27 | 3677 | pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n", |
5951146d | 3678 | i, sg, sg_page(sg), sg->length, sg->offset); |
c66ac9db | 3679 | if (sg_is_chain(sg)) |
6708bb27 | 3680 | pr_debug("SG: %p sg_is_chain=1\n", sg); |
c66ac9db | 3681 | if (sg_is_last(sg)) |
6708bb27 | 3682 | pr_debug("SG: %p sg_is_last=1\n", sg); |
c66ac9db | 3683 | } |
c66ac9db NB |
3684 | } |
3685 | EXPORT_SYMBOL(transport_do_task_sg_chain); | |
3686 | ||
a1d8b49a AG |
3687 | /* |
3688 | * Break up cmd into chunks transport can handle | |
3689 | */ | |
38b40067 CH |
3690 | static int |
3691 | transport_allocate_data_tasks(struct se_cmd *cmd, | |
c66ac9db | 3692 | enum dma_data_direction data_direction, |
38b40067 | 3693 | struct scatterlist *cmd_sg, unsigned int sgl_nents) |
c66ac9db | 3694 | { |
5951146d | 3695 | struct se_device *dev = cmd->se_dev; |
a3eedc22 | 3696 | int task_count, i; |
38b40067 CH |
3697 | unsigned long long lba; |
3698 | sector_t sectors, dev_max_sectors; | |
3699 | u32 sector_size; | |
3700 | ||
3701 | if (transport_cmd_get_valid_sectors(cmd) < 0) | |
3702 | return -EINVAL; | |
3703 | ||
3704 | dev_max_sectors = dev->se_sub_dev->se_dev_attrib.max_sectors; | |
3705 | sector_size = dev->se_sub_dev->se_dev_attrib.block_size; | |
a1d8b49a | 3706 | |
ec98f782 | 3707 | WARN_ON(cmd->data_length % sector_size); |
38b40067 CH |
3708 | |
3709 | lba = cmd->t_task_lba; | |
ec98f782 | 3710 | sectors = DIV_ROUND_UP(cmd->data_length, sector_size); |
277c5f27 | 3711 | task_count = DIV_ROUND_UP_SECTOR_T(sectors, dev_max_sectors); |
af3f00c7 CH |
3712 | |
3713 | /* | |
3714 | * If we need just a single task reuse the SG list in the command | |
3715 | * and avoid a lot of work. | |
3716 | */ | |
3717 | if (task_count == 1) { | |
3718 | struct se_task *task; | |
3719 | unsigned long flags; | |
3720 | ||
3721 | task = transport_generic_get_task(cmd, data_direction); | |
3722 | if (!task) | |
3723 | return -ENOMEM; | |
3724 | ||
3725 | task->task_sg = cmd_sg; | |
3726 | task->task_sg_nents = sgl_nents; | |
3727 | ||
3728 | task->task_lba = lba; | |
3729 | task->task_sectors = sectors; | |
3730 | task->task_size = task->task_sectors * sector_size; | |
3731 | ||
3732 | spin_lock_irqsave(&cmd->t_state_lock, flags); | |
3733 | list_add_tail(&task->t_list, &cmd->t_task_list); | |
3734 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
3735 | ||
3736 | return task_count; | |
3737 | } | |
3738 | ||
ec98f782 | 3739 | for (i = 0; i < task_count; i++) { |
38b40067 | 3740 | struct se_task *task; |
c3c74c7a | 3741 | unsigned int task_size, task_sg_nents_padded; |
38b40067 CH |
3742 | struct scatterlist *sg; |
3743 | unsigned long flags; | |
ec98f782 | 3744 | int count; |
a1d8b49a | 3745 | |
c66ac9db | 3746 | task = transport_generic_get_task(cmd, data_direction); |
a1d8b49a | 3747 | if (!task) |
ec98f782 | 3748 | return -ENOMEM; |
c66ac9db | 3749 | |
c66ac9db | 3750 | task->task_lba = lba; |
ec98f782 AG |
3751 | task->task_sectors = min(sectors, dev_max_sectors); |
3752 | task->task_size = task->task_sectors * sector_size; | |
c66ac9db | 3753 | |
525a48a2 NB |
3754 | /* |
3755 | * This now assumes that passed sg_ents are in PAGE_SIZE chunks | |
3756 | * in order to calculate the number per task SGL entries | |
3757 | */ | |
3758 | task->task_sg_nents = DIV_ROUND_UP(task->task_size, PAGE_SIZE); | |
c66ac9db | 3759 | /* |
ec98f782 AG |
3760 | * Check if the fabric module driver is requesting that all |
3761 | * struct se_task->task_sg[] be chained together.. If so, | |
3762 | * then allocate an extra padding SG entry for linking and | |
c3c74c7a NB |
3763 | * marking the end of the chained SGL for every task except |
3764 | * the last one for (task_count > 1) operation, or skipping | |
3765 | * the extra padding for the (task_count == 1) case. | |
c66ac9db | 3766 | */ |
c3c74c7a NB |
3767 | if (cmd->se_tfo->task_sg_chaining && (i < (task_count - 1))) { |
3768 | task_sg_nents_padded = (task->task_sg_nents + 1); | |
c3c74c7a NB |
3769 | } else |
3770 | task_sg_nents_padded = task->task_sg_nents; | |
c66ac9db | 3771 | |
1d20bb61 | 3772 | task->task_sg = kmalloc(sizeof(struct scatterlist) * |
c3c74c7a | 3773 | task_sg_nents_padded, GFP_KERNEL); |
ec98f782 AG |
3774 | if (!task->task_sg) { |
3775 | cmd->se_dev->transport->free_task(task); | |
3776 | return -ENOMEM; | |
3777 | } | |
3778 | ||
c3c74c7a | 3779 | sg_init_table(task->task_sg, task_sg_nents_padded); |
c66ac9db | 3780 | |
ec98f782 AG |
3781 | task_size = task->task_size; |
3782 | ||
3783 | /* Build new sgl, only up to task_size */ | |
6708bb27 | 3784 | for_each_sg(task->task_sg, sg, task->task_sg_nents, count) { |
ec98f782 AG |
3785 | if (cmd_sg->length > task_size) |
3786 | break; | |
3787 | ||
3788 | *sg = *cmd_sg; | |
3789 | task_size -= cmd_sg->length; | |
3790 | cmd_sg = sg_next(cmd_sg); | |
c66ac9db | 3791 | } |
c66ac9db | 3792 | |
ec98f782 AG |
3793 | lba += task->task_sectors; |
3794 | sectors -= task->task_sectors; | |
c66ac9db | 3795 | |
ec98f782 AG |
3796 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
3797 | list_add_tail(&task->t_list, &cmd->t_task_list); | |
3798 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
c66ac9db NB |
3799 | } |
3800 | ||
ec98f782 | 3801 | return task_count; |
c66ac9db NB |
3802 | } |
3803 | ||
3804 | static int | |
ec98f782 | 3805 | transport_allocate_control_task(struct se_cmd *cmd) |
c66ac9db | 3806 | { |
c66ac9db | 3807 | struct se_task *task; |
ec98f782 | 3808 | unsigned long flags; |
c66ac9db | 3809 | |
91ec1d35 NB |
3810 | /* Workaround for handling zero-length control CDBs */ |
3811 | if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) && | |
3812 | !cmd->data_length) | |
3813 | return 0; | |
3814 | ||
c66ac9db NB |
3815 | task = transport_generic_get_task(cmd, cmd->data_direction); |
3816 | if (!task) | |
ec98f782 | 3817 | return -ENOMEM; |
c66ac9db | 3818 | |
af3f00c7 | 3819 | task->task_sg = cmd->t_data_sg; |
c66ac9db | 3820 | task->task_size = cmd->data_length; |
6708bb27 | 3821 | task->task_sg_nents = cmd->t_data_nents; |
c66ac9db | 3822 | |
ec98f782 AG |
3823 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
3824 | list_add_tail(&task->t_list, &cmd->t_task_list); | |
3825 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
c66ac9db | 3826 | |
6708bb27 | 3827 | /* Success! Return number of tasks allocated */ |
a3eedc22 | 3828 | return 1; |
ec98f782 AG |
3829 | } |
3830 | ||
da0f7619 CH |
3831 | /* |
3832 | * Allocate any required ressources to execute the command, and either place | |
3833 | * it on the execution queue if possible. For writes we might not have the | |
3834 | * payload yet, thus notify the fabric via a call to ->write_pending instead. | |
c66ac9db | 3835 | */ |
a1d8b49a | 3836 | int transport_generic_new_cmd(struct se_cmd *cmd) |
c66ac9db | 3837 | { |
da0f7619 | 3838 | struct se_device *dev = cmd->se_dev; |
9ac54987 | 3839 | int task_cdbs, task_cdbs_bidi = 0; |
da0f7619 | 3840 | int set_counts = 1; |
c66ac9db NB |
3841 | int ret = 0; |
3842 | ||
3843 | /* | |
3844 | * Determine is the TCM fabric module has already allocated physical | |
3845 | * memory, and is directly calling transport_generic_map_mem_to_cmd() | |
ec98f782 | 3846 | * beforehand. |
c66ac9db | 3847 | */ |
ec98f782 AG |
3848 | if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) && |
3849 | cmd->data_length) { | |
05d1c7c0 | 3850 | ret = transport_generic_get_mem(cmd); |
c66ac9db | 3851 | if (ret < 0) |
03e98c9e | 3852 | goto out_fail; |
c66ac9db | 3853 | } |
da0f7619 | 3854 | |
1d20bb61 | 3855 | /* |
38b40067 | 3856 | * For BIDI command set up the read tasks first. |
1d20bb61 | 3857 | */ |
da0f7619 | 3858 | if (cmd->t_bidi_data_sg && |
38b40067 CH |
3859 | dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) { |
3860 | BUG_ON(!(cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)); | |
3861 | ||
9ac54987 NB |
3862 | task_cdbs_bidi = transport_allocate_data_tasks(cmd, |
3863 | DMA_FROM_DEVICE, cmd->t_bidi_data_sg, | |
3864 | cmd->t_bidi_data_nents); | |
3865 | if (task_cdbs_bidi <= 0) | |
da0f7619 CH |
3866 | goto out_fail; |
3867 | ||
3868 | atomic_inc(&cmd->t_fe_count); | |
3869 | atomic_inc(&cmd->t_se_count); | |
3870 | set_counts = 0; | |
3871 | } | |
38b40067 CH |
3872 | |
3873 | if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) { | |
3874 | task_cdbs = transport_allocate_data_tasks(cmd, | |
3875 | cmd->data_direction, cmd->t_data_sg, | |
3876 | cmd->t_data_nents); | |
3877 | } else { | |
3878 | task_cdbs = transport_allocate_control_task(cmd); | |
3879 | } | |
3880 | ||
410f6702 | 3881 | if (task_cdbs < 0) |
da0f7619 | 3882 | goto out_fail; |
410f6702 | 3883 | else if (!task_cdbs && (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)) { |
7d680f3b | 3884 | spin_lock_irq(&cmd->t_state_lock); |
410f6702 | 3885 | cmd->t_state = TRANSPORT_COMPLETE; |
7d680f3b CH |
3886 | cmd->transport_state |= CMD_T_ACTIVE; |
3887 | spin_unlock_irq(&cmd->t_state_lock); | |
91ec1d35 NB |
3888 | |
3889 | if (cmd->t_task_cdb[0] == REQUEST_SENSE) { | |
3890 | u8 ua_asc = 0, ua_ascq = 0; | |
3891 | ||
3892 | core_scsi3_ua_clear_for_request_sense(cmd, | |
3893 | &ua_asc, &ua_ascq); | |
3894 | } | |
3895 | ||
410f6702 RD |
3896 | INIT_WORK(&cmd->work, target_complete_ok_work); |
3897 | queue_work(target_completion_wq, &cmd->work); | |
3898 | return 0; | |
3899 | } | |
da0f7619 CH |
3900 | |
3901 | if (set_counts) { | |
3902 | atomic_inc(&cmd->t_fe_count); | |
3903 | atomic_inc(&cmd->t_se_count); | |
3904 | } | |
3905 | ||
9ac54987 NB |
3906 | cmd->t_task_list_num = (task_cdbs + task_cdbs_bidi); |
3907 | atomic_set(&cmd->t_task_cdbs_left, cmd->t_task_list_num); | |
3908 | atomic_set(&cmd->t_task_cdbs_ex_left, cmd->t_task_list_num); | |
da0f7619 | 3909 | |
c66ac9db | 3910 | /* |
a1d8b49a | 3911 | * For WRITEs, let the fabric know its buffer is ready.. |
c66ac9db NB |
3912 | * This WRITE struct se_cmd (and all of its associated struct se_task's) |
3913 | * will be added to the struct se_device execution queue after its WRITE | |
3914 | * data has arrived. (ie: It gets handled by the transport processing | |
3915 | * thread a second time) | |
3916 | */ | |
3917 | if (cmd->data_direction == DMA_TO_DEVICE) { | |
3918 | transport_add_tasks_to_state_queue(cmd); | |
3919 | return transport_generic_write_pending(cmd); | |
3920 | } | |
3921 | /* | |
3922 | * Everything else but a WRITE, add the struct se_cmd's struct se_task's | |
3923 | * to the execution queue. | |
3924 | */ | |
3925 | transport_execute_tasks(cmd); | |
3926 | return 0; | |
da0f7619 CH |
3927 | |
3928 | out_fail: | |
3929 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
3930 | cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
3931 | return -EINVAL; | |
c66ac9db | 3932 | } |
a1d8b49a | 3933 | EXPORT_SYMBOL(transport_generic_new_cmd); |
c66ac9db NB |
3934 | |
3935 | /* transport_generic_process_write(): | |
3936 | * | |
3937 | * | |
3938 | */ | |
3939 | void transport_generic_process_write(struct se_cmd *cmd) | |
3940 | { | |
c66ac9db NB |
3941 | transport_execute_tasks(cmd); |
3942 | } | |
3943 | EXPORT_SYMBOL(transport_generic_process_write); | |
3944 | ||
e057f533 | 3945 | static void transport_write_pending_qf(struct se_cmd *cmd) |
07bde79a | 3946 | { |
f147abb4 NB |
3947 | int ret; |
3948 | ||
3949 | ret = cmd->se_tfo->write_pending(cmd); | |
3950 | if (ret == -EAGAIN || ret == -ENOMEM) { | |
e057f533 CH |
3951 | pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", |
3952 | cmd); | |
3953 | transport_handle_queue_full(cmd, cmd->se_dev); | |
3954 | } | |
07bde79a NB |
3955 | } |
3956 | ||
c66ac9db NB |
3957 | static int transport_generic_write_pending(struct se_cmd *cmd) |
3958 | { | |
3959 | unsigned long flags; | |
3960 | int ret; | |
3961 | ||
a1d8b49a | 3962 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 3963 | cmd->t_state = TRANSPORT_WRITE_PENDING; |
a1d8b49a | 3964 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
07bde79a | 3965 | |
c66ac9db NB |
3966 | /* |
3967 | * Clear the se_cmd for WRITE_PENDING status in order to set | |
7d680f3b CH |
3968 | * CMD_T_ACTIVE so that transport_generic_handle_data can be called |
3969 | * from HW target mode interrupt code. This is safe to be called | |
3970 | * with transport_off=1 before the cmd->se_tfo->write_pending | |
c66ac9db NB |
3971 | * because the se_cmd->se_lun pointer is not being cleared. |
3972 | */ | |
3973 | transport_cmd_check_stop(cmd, 1, 0); | |
3974 | ||
3975 | /* | |
3976 | * Call the fabric write_pending function here to let the | |
3977 | * frontend know that WRITE buffers are ready. | |
3978 | */ | |
e3d6f909 | 3979 | ret = cmd->se_tfo->write_pending(cmd); |
f147abb4 | 3980 | if (ret == -EAGAIN || ret == -ENOMEM) |
07bde79a NB |
3981 | goto queue_full; |
3982 | else if (ret < 0) | |
c66ac9db NB |
3983 | return ret; |
3984 | ||
03e98c9e | 3985 | return 1; |
07bde79a NB |
3986 | |
3987 | queue_full: | |
6708bb27 | 3988 | pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd); |
07bde79a | 3989 | cmd->t_state = TRANSPORT_COMPLETE_QF_WP; |
e057f533 | 3990 | transport_handle_queue_full(cmd, cmd->se_dev); |
f147abb4 | 3991 | return 0; |
c66ac9db NB |
3992 | } |
3993 | ||
39c05f32 | 3994 | void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks) |
c66ac9db | 3995 | { |
d14921d6 | 3996 | if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) { |
c8e31f26 | 3997 | if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) |
d14921d6 NB |
3998 | transport_wait_for_tasks(cmd); |
3999 | ||
35462975 | 4000 | transport_release_cmd(cmd); |
d14921d6 NB |
4001 | } else { |
4002 | if (wait_for_tasks) | |
4003 | transport_wait_for_tasks(cmd); | |
4004 | ||
c66ac9db NB |
4005 | core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd); |
4006 | ||
82f1c8a4 | 4007 | if (cmd->se_lun) |
c66ac9db | 4008 | transport_lun_remove_cmd(cmd); |
c66ac9db | 4009 | |
f4366772 NB |
4010 | transport_free_dev_tasks(cmd); |
4011 | ||
39c05f32 | 4012 | transport_put_cmd(cmd); |
c66ac9db NB |
4013 | } |
4014 | } | |
4015 | EXPORT_SYMBOL(transport_generic_free_cmd); | |
4016 | ||
a17f091d NB |
4017 | /* target_get_sess_cmd - Add command to active ->sess_cmd_list |
4018 | * @se_sess: session to reference | |
4019 | * @se_cmd: command descriptor to add | |
a6360785 | 4020 | * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd() |
a17f091d | 4021 | */ |
a6360785 NB |
4022 | void target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd, |
4023 | bool ack_kref) | |
a17f091d NB |
4024 | { |
4025 | unsigned long flags; | |
4026 | ||
7481deb4 | 4027 | kref_init(&se_cmd->cmd_kref); |
a6360785 NB |
4028 | /* |
4029 | * Add a second kref if the fabric caller is expecting to handle | |
4030 | * fabric acknowledgement that requires two target_put_sess_cmd() | |
4031 | * invocations before se_cmd descriptor release. | |
4032 | */ | |
86715569 | 4033 | if (ack_kref == true) { |
a6360785 | 4034 | kref_get(&se_cmd->cmd_kref); |
86715569 NB |
4035 | se_cmd->se_cmd_flags |= SCF_ACK_KREF; |
4036 | } | |
7481deb4 | 4037 | |
a17f091d NB |
4038 | spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); |
4039 | list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list); | |
4040 | se_cmd->check_release = 1; | |
4041 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); | |
4042 | } | |
4043 | EXPORT_SYMBOL(target_get_sess_cmd); | |
4044 | ||
7481deb4 | 4045 | static void target_release_cmd_kref(struct kref *kref) |
a17f091d | 4046 | { |
7481deb4 NB |
4047 | struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref); |
4048 | struct se_session *se_sess = se_cmd->se_sess; | |
a17f091d NB |
4049 | unsigned long flags; |
4050 | ||
4051 | spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); | |
4052 | if (list_empty(&se_cmd->se_cmd_list)) { | |
4053 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); | |
ffc32d52 | 4054 | se_cmd->se_tfo->release_cmd(se_cmd); |
7481deb4 | 4055 | return; |
a17f091d | 4056 | } |
a17f091d NB |
4057 | if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) { |
4058 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); | |
4059 | complete(&se_cmd->cmd_wait_comp); | |
7481deb4 | 4060 | return; |
a17f091d NB |
4061 | } |
4062 | list_del(&se_cmd->se_cmd_list); | |
4063 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); | |
4064 | ||
7481deb4 NB |
4065 | se_cmd->se_tfo->release_cmd(se_cmd); |
4066 | } | |
4067 | ||
4068 | /* target_put_sess_cmd - Check for active I/O shutdown via kref_put | |
4069 | * @se_sess: session to reference | |
4070 | * @se_cmd: command descriptor to drop | |
4071 | */ | |
4072 | int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd) | |
4073 | { | |
4074 | return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref); | |
a17f091d NB |
4075 | } |
4076 | EXPORT_SYMBOL(target_put_sess_cmd); | |
4077 | ||
4078 | /* target_splice_sess_cmd_list - Split active cmds into sess_wait_list | |
4079 | * @se_sess: session to split | |
4080 | */ | |
4081 | void target_splice_sess_cmd_list(struct se_session *se_sess) | |
4082 | { | |
4083 | struct se_cmd *se_cmd; | |
4084 | unsigned long flags; | |
4085 | ||
4086 | WARN_ON(!list_empty(&se_sess->sess_wait_list)); | |
4087 | INIT_LIST_HEAD(&se_sess->sess_wait_list); | |
4088 | ||
4089 | spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); | |
4090 | se_sess->sess_tearing_down = 1; | |
4091 | ||
4092 | list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list); | |
4093 | ||
4094 | list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list) | |
4095 | se_cmd->cmd_wait_set = 1; | |
4096 | ||
4097 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); | |
4098 | } | |
4099 | EXPORT_SYMBOL(target_splice_sess_cmd_list); | |
4100 | ||
4101 | /* target_wait_for_sess_cmds - Wait for outstanding descriptors | |
4102 | * @se_sess: session to wait for active I/O | |
4103 | * @wait_for_tasks: Make extra transport_wait_for_tasks call | |
4104 | */ | |
4105 | void target_wait_for_sess_cmds( | |
4106 | struct se_session *se_sess, | |
4107 | int wait_for_tasks) | |
4108 | { | |
4109 | struct se_cmd *se_cmd, *tmp_cmd; | |
4110 | bool rc = false; | |
4111 | ||
4112 | list_for_each_entry_safe(se_cmd, tmp_cmd, | |
4113 | &se_sess->sess_wait_list, se_cmd_list) { | |
4114 | list_del(&se_cmd->se_cmd_list); | |
4115 | ||
4116 | pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:" | |
4117 | " %d\n", se_cmd, se_cmd->t_state, | |
4118 | se_cmd->se_tfo->get_cmd_state(se_cmd)); | |
4119 | ||
4120 | if (wait_for_tasks) { | |
4121 | pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d," | |
4122 | " fabric state: %d\n", se_cmd, se_cmd->t_state, | |
4123 | se_cmd->se_tfo->get_cmd_state(se_cmd)); | |
4124 | ||
4125 | rc = transport_wait_for_tasks(se_cmd); | |
4126 | ||
4127 | pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d," | |
4128 | " fabric state: %d\n", se_cmd, se_cmd->t_state, | |
4129 | se_cmd->se_tfo->get_cmd_state(se_cmd)); | |
4130 | } | |
4131 | ||
4132 | if (!rc) { | |
4133 | wait_for_completion(&se_cmd->cmd_wait_comp); | |
4134 | pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d" | |
4135 | " fabric state: %d\n", se_cmd, se_cmd->t_state, | |
4136 | se_cmd->se_tfo->get_cmd_state(se_cmd)); | |
4137 | } | |
4138 | ||
4139 | se_cmd->se_tfo->release_cmd(se_cmd); | |
4140 | } | |
4141 | } | |
4142 | EXPORT_SYMBOL(target_wait_for_sess_cmds); | |
4143 | ||
c66ac9db NB |
4144 | /* transport_lun_wait_for_tasks(): |
4145 | * | |
4146 | * Called from ConfigFS context to stop the passed struct se_cmd to allow | |
4147 | * an struct se_lun to be successfully shutdown. | |
4148 | */ | |
4149 | static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun) | |
4150 | { | |
4151 | unsigned long flags; | |
4152 | int ret; | |
4153 | /* | |
4154 | * If the frontend has already requested this struct se_cmd to | |
4155 | * be stopped, we can safely ignore this struct se_cmd. | |
4156 | */ | |
a1d8b49a | 4157 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
7d680f3b CH |
4158 | if (cmd->transport_state & CMD_T_STOP) { |
4159 | cmd->transport_state &= ~CMD_T_LUN_STOP; | |
4160 | ||
4161 | pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n", | |
4162 | cmd->se_tfo->get_task_tag(cmd)); | |
a1d8b49a | 4163 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 4164 | transport_cmd_check_stop(cmd, 1, 0); |
e3d6f909 | 4165 | return -EPERM; |
c66ac9db | 4166 | } |
7d680f3b | 4167 | cmd->transport_state |= CMD_T_LUN_FE_STOP; |
a1d8b49a | 4168 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 4169 | |
5951146d | 4170 | wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq); |
c66ac9db NB |
4171 | |
4172 | ret = transport_stop_tasks_for_cmd(cmd); | |
4173 | ||
6708bb27 AG |
4174 | pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:" |
4175 | " %d\n", cmd, cmd->t_task_list_num, ret); | |
c66ac9db | 4176 | if (!ret) { |
6708bb27 | 4177 | pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n", |
e3d6f909 | 4178 | cmd->se_tfo->get_task_tag(cmd)); |
a1d8b49a | 4179 | wait_for_completion(&cmd->transport_lun_stop_comp); |
6708bb27 | 4180 | pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n", |
e3d6f909 | 4181 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 4182 | } |
3df8d40b | 4183 | transport_remove_cmd_from_queue(cmd); |
c66ac9db NB |
4184 | |
4185 | return 0; | |
4186 | } | |
4187 | ||
c66ac9db NB |
4188 | static void __transport_clear_lun_from_sessions(struct se_lun *lun) |
4189 | { | |
4190 | struct se_cmd *cmd = NULL; | |
4191 | unsigned long lun_flags, cmd_flags; | |
4192 | /* | |
4193 | * Do exception processing and return CHECK_CONDITION status to the | |
4194 | * Initiator Port. | |
4195 | */ | |
4196 | spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags); | |
5951146d AG |
4197 | while (!list_empty(&lun->lun_cmd_list)) { |
4198 | cmd = list_first_entry(&lun->lun_cmd_list, | |
4199 | struct se_cmd, se_lun_node); | |
3d26fea0 | 4200 | list_del_init(&cmd->se_lun_node); |
5951146d | 4201 | |
c66ac9db NB |
4202 | /* |
4203 | * This will notify iscsi_target_transport.c: | |
4204 | * transport_cmd_check_stop() that a LUN shutdown is in | |
4205 | * progress for the iscsi_cmd_t. | |
4206 | */ | |
a1d8b49a | 4207 | spin_lock(&cmd->t_state_lock); |
6708bb27 | 4208 | pr_debug("SE_LUN[%d] - Setting cmd->transport" |
c66ac9db | 4209 | "_lun_stop for ITT: 0x%08x\n", |
e3d6f909 AG |
4210 | cmd->se_lun->unpacked_lun, |
4211 | cmd->se_tfo->get_task_tag(cmd)); | |
7d680f3b | 4212 | cmd->transport_state |= CMD_T_LUN_STOP; |
a1d8b49a | 4213 | spin_unlock(&cmd->t_state_lock); |
c66ac9db NB |
4214 | |
4215 | spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags); | |
4216 | ||
6708bb27 AG |
4217 | if (!cmd->se_lun) { |
4218 | pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n", | |
e3d6f909 AG |
4219 | cmd->se_tfo->get_task_tag(cmd), |
4220 | cmd->se_tfo->get_cmd_state(cmd), cmd->t_state); | |
c66ac9db NB |
4221 | BUG(); |
4222 | } | |
4223 | /* | |
4224 | * If the Storage engine still owns the iscsi_cmd_t, determine | |
4225 | * and/or stop its context. | |
4226 | */ | |
6708bb27 | 4227 | pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport" |
e3d6f909 AG |
4228 | "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun, |
4229 | cmd->se_tfo->get_task_tag(cmd)); | |
c66ac9db | 4230 | |
e3d6f909 | 4231 | if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) { |
c66ac9db NB |
4232 | spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags); |
4233 | continue; | |
4234 | } | |
4235 | ||
6708bb27 | 4236 | pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun" |
c66ac9db | 4237 | "_wait_for_tasks(): SUCCESS\n", |
e3d6f909 AG |
4238 | cmd->se_lun->unpacked_lun, |
4239 | cmd->se_tfo->get_task_tag(cmd)); | |
c66ac9db | 4240 | |
a1d8b49a | 4241 | spin_lock_irqsave(&cmd->t_state_lock, cmd_flags); |
7d680f3b | 4242 | if (!(cmd->transport_state & CMD_T_DEV_ACTIVE)) { |
a1d8b49a | 4243 | spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags); |
c66ac9db NB |
4244 | goto check_cond; |
4245 | } | |
7d680f3b | 4246 | cmd->transport_state &= ~CMD_T_DEV_ACTIVE; |
c66ac9db | 4247 | transport_all_task_dev_remove_state(cmd); |
a1d8b49a | 4248 | spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags); |
c66ac9db NB |
4249 | |
4250 | transport_free_dev_tasks(cmd); | |
4251 | /* | |
4252 | * The Storage engine stopped this struct se_cmd before it was | |
4253 | * send to the fabric frontend for delivery back to the | |
4254 | * Initiator Node. Return this SCSI CDB back with an | |
4255 | * CHECK_CONDITION status. | |
4256 | */ | |
4257 | check_cond: | |
4258 | transport_send_check_condition_and_sense(cmd, | |
4259 | TCM_NON_EXISTENT_LUN, 0); | |
4260 | /* | |
4261 | * If the fabric frontend is waiting for this iscsi_cmd_t to | |
4262 | * be released, notify the waiting thread now that LU has | |
4263 | * finished accessing it. | |
4264 | */ | |
a1d8b49a | 4265 | spin_lock_irqsave(&cmd->t_state_lock, cmd_flags); |
7d680f3b | 4266 | if (cmd->transport_state & CMD_T_LUN_FE_STOP) { |
6708bb27 | 4267 | pr_debug("SE_LUN[%d] - Detected FE stop for" |
c66ac9db NB |
4268 | " struct se_cmd: %p ITT: 0x%08x\n", |
4269 | lun->unpacked_lun, | |
e3d6f909 | 4270 | cmd, cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 4271 | |
a1d8b49a | 4272 | spin_unlock_irqrestore(&cmd->t_state_lock, |
c66ac9db NB |
4273 | cmd_flags); |
4274 | transport_cmd_check_stop(cmd, 1, 0); | |
a1d8b49a | 4275 | complete(&cmd->transport_lun_fe_stop_comp); |
c66ac9db NB |
4276 | spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags); |
4277 | continue; | |
4278 | } | |
6708bb27 | 4279 | pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n", |
e3d6f909 | 4280 | lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 4281 | |
a1d8b49a | 4282 | spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags); |
c66ac9db NB |
4283 | spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags); |
4284 | } | |
4285 | spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags); | |
4286 | } | |
4287 | ||
4288 | static int transport_clear_lun_thread(void *p) | |
4289 | { | |
8359cf43 | 4290 | struct se_lun *lun = p; |
c66ac9db NB |
4291 | |
4292 | __transport_clear_lun_from_sessions(lun); | |
4293 | complete(&lun->lun_shutdown_comp); | |
4294 | ||
4295 | return 0; | |
4296 | } | |
4297 | ||
4298 | int transport_clear_lun_from_sessions(struct se_lun *lun) | |
4299 | { | |
4300 | struct task_struct *kt; | |
4301 | ||
5951146d | 4302 | kt = kthread_run(transport_clear_lun_thread, lun, |
c66ac9db NB |
4303 | "tcm_cl_%u", lun->unpacked_lun); |
4304 | if (IS_ERR(kt)) { | |
6708bb27 | 4305 | pr_err("Unable to start clear_lun thread\n"); |
e3d6f909 | 4306 | return PTR_ERR(kt); |
c66ac9db NB |
4307 | } |
4308 | wait_for_completion(&lun->lun_shutdown_comp); | |
4309 | ||
4310 | return 0; | |
4311 | } | |
4312 | ||
d14921d6 NB |
4313 | /** |
4314 | * transport_wait_for_tasks - wait for completion to occur | |
4315 | * @cmd: command to wait | |
c66ac9db | 4316 | * |
d14921d6 NB |
4317 | * Called from frontend fabric context to wait for storage engine |
4318 | * to pause and/or release frontend generated struct se_cmd. | |
c66ac9db | 4319 | */ |
a17f091d | 4320 | bool transport_wait_for_tasks(struct se_cmd *cmd) |
c66ac9db NB |
4321 | { |
4322 | unsigned long flags; | |
4323 | ||
a1d8b49a | 4324 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c8e31f26 AG |
4325 | if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && |
4326 | !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) { | |
d14921d6 | 4327 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
a17f091d | 4328 | return false; |
d14921d6 NB |
4329 | } |
4330 | /* | |
4331 | * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE | |
4332 | * has been set in transport_set_supported_SAM_opcode(). | |
4333 | */ | |
c8e31f26 AG |
4334 | if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) && |
4335 | !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) { | |
d14921d6 | 4336 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
a17f091d | 4337 | return false; |
d14921d6 | 4338 | } |
c66ac9db NB |
4339 | /* |
4340 | * If we are already stopped due to an external event (ie: LUN shutdown) | |
4341 | * sleep until the connection can have the passed struct se_cmd back. | |
a1d8b49a | 4342 | * The cmd->transport_lun_stopped_sem will be upped by |
c66ac9db NB |
4343 | * transport_clear_lun_from_sessions() once the ConfigFS context caller |
4344 | * has completed its operation on the struct se_cmd. | |
4345 | */ | |
7d680f3b | 4346 | if (cmd->transport_state & CMD_T_LUN_STOP) { |
6708bb27 | 4347 | pr_debug("wait_for_tasks: Stopping" |
e3d6f909 | 4348 | " wait_for_completion(&cmd->t_tasktransport_lun_fe" |
c66ac9db | 4349 | "_stop_comp); for ITT: 0x%08x\n", |
e3d6f909 | 4350 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db NB |
4351 | /* |
4352 | * There is a special case for WRITES where a FE exception + | |
4353 | * LUN shutdown means ConfigFS context is still sleeping on | |
4354 | * transport_lun_stop_comp in transport_lun_wait_for_tasks(). | |
4355 | * We go ahead and up transport_lun_stop_comp just to be sure | |
4356 | * here. | |
4357 | */ | |
a1d8b49a AG |
4358 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
4359 | complete(&cmd->transport_lun_stop_comp); | |
4360 | wait_for_completion(&cmd->transport_lun_fe_stop_comp); | |
4361 | spin_lock_irqsave(&cmd->t_state_lock, flags); | |
c66ac9db NB |
4362 | |
4363 | transport_all_task_dev_remove_state(cmd); | |
4364 | /* | |
4365 | * At this point, the frontend who was the originator of this | |
4366 | * struct se_cmd, now owns the structure and can be released through | |
4367 | * normal means below. | |
4368 | */ | |
6708bb27 | 4369 | pr_debug("wait_for_tasks: Stopped" |
e3d6f909 | 4370 | " wait_for_completion(&cmd->t_tasktransport_lun_fe_" |
c66ac9db | 4371 | "stop_comp); for ITT: 0x%08x\n", |
e3d6f909 | 4372 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 4373 | |
7d680f3b | 4374 | cmd->transport_state &= ~CMD_T_LUN_STOP; |
c66ac9db | 4375 | } |
7d680f3b CH |
4376 | |
4377 | if (!(cmd->transport_state & CMD_T_ACTIVE) || | |
4378 | (cmd->transport_state & CMD_T_ABORTED)) { | |
d14921d6 | 4379 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
a17f091d | 4380 | return false; |
d14921d6 | 4381 | } |
c66ac9db | 4382 | |
7d680f3b | 4383 | cmd->transport_state |= CMD_T_STOP; |
c66ac9db | 4384 | |
6708bb27 | 4385 | pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x" |
7d680f3b | 4386 | " i_state: %d, t_state: %d, CMD_T_STOP\n", |
f2da9dbd CH |
4387 | cmd, cmd->se_tfo->get_task_tag(cmd), |
4388 | cmd->se_tfo->get_cmd_state(cmd), cmd->t_state); | |
c66ac9db | 4389 | |
a1d8b49a | 4390 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 4391 | |
5951146d | 4392 | wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq); |
c66ac9db | 4393 | |
a1d8b49a | 4394 | wait_for_completion(&cmd->t_transport_stop_comp); |
c66ac9db | 4395 | |
a1d8b49a | 4396 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
7d680f3b | 4397 | cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP); |
c66ac9db | 4398 | |
6708bb27 | 4399 | pr_debug("wait_for_tasks: Stopped wait_for_compltion(" |
a1d8b49a | 4400 | "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n", |
e3d6f909 | 4401 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 4402 | |
d14921d6 | 4403 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
a17f091d NB |
4404 | |
4405 | return true; | |
c66ac9db | 4406 | } |
d14921d6 | 4407 | EXPORT_SYMBOL(transport_wait_for_tasks); |
c66ac9db NB |
4408 | |
4409 | static int transport_get_sense_codes( | |
4410 | struct se_cmd *cmd, | |
4411 | u8 *asc, | |
4412 | u8 *ascq) | |
4413 | { | |
4414 | *asc = cmd->scsi_asc; | |
4415 | *ascq = cmd->scsi_ascq; | |
4416 | ||
4417 | return 0; | |
4418 | } | |
4419 | ||
4420 | static int transport_set_sense_codes( | |
4421 | struct se_cmd *cmd, | |
4422 | u8 asc, | |
4423 | u8 ascq) | |
4424 | { | |
4425 | cmd->scsi_asc = asc; | |
4426 | cmd->scsi_ascq = ascq; | |
4427 | ||
4428 | return 0; | |
4429 | } | |
4430 | ||
4431 | int transport_send_check_condition_and_sense( | |
4432 | struct se_cmd *cmd, | |
4433 | u8 reason, | |
4434 | int from_transport) | |
4435 | { | |
4436 | unsigned char *buffer = cmd->sense_buffer; | |
4437 | unsigned long flags; | |
4438 | int offset; | |
4439 | u8 asc = 0, ascq = 0; | |
4440 | ||
a1d8b49a | 4441 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 4442 | if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) { |
a1d8b49a | 4443 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
4444 | return 0; |
4445 | } | |
4446 | cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION; | |
a1d8b49a | 4447 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
4448 | |
4449 | if (!reason && from_transport) | |
4450 | goto after_reason; | |
4451 | ||
4452 | if (!from_transport) | |
4453 | cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE; | |
4454 | /* | |
4455 | * Data Segment and SenseLength of the fabric response PDU. | |
4456 | * | |
4457 | * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE | |
4458 | * from include/scsi/scsi_cmnd.h | |
4459 | */ | |
e3d6f909 | 4460 | offset = cmd->se_tfo->set_fabric_sense_len(cmd, |
c66ac9db NB |
4461 | TRANSPORT_SENSE_BUFFER); |
4462 | /* | |
4463 | * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses | |
4464 | * SENSE KEY values from include/scsi/scsi.h | |
4465 | */ | |
4466 | switch (reason) { | |
4467 | case TCM_NON_EXISTENT_LUN: | |
eb39d340 NB |
4468 | /* CURRENT ERROR */ |
4469 | buffer[offset] = 0x70; | |
895f3022 | 4470 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
eb39d340 NB |
4471 | /* ILLEGAL REQUEST */ |
4472 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; | |
4473 | /* LOGICAL UNIT NOT SUPPORTED */ | |
4474 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25; | |
4475 | break; | |
c66ac9db NB |
4476 | case TCM_UNSUPPORTED_SCSI_OPCODE: |
4477 | case TCM_SECTOR_COUNT_TOO_MANY: | |
4478 | /* CURRENT ERROR */ | |
4479 | buffer[offset] = 0x70; | |
895f3022 | 4480 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
4481 | /* ILLEGAL REQUEST */ |
4482 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; | |
4483 | /* INVALID COMMAND OPERATION CODE */ | |
4484 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20; | |
4485 | break; | |
4486 | case TCM_UNKNOWN_MODE_PAGE: | |
4487 | /* CURRENT ERROR */ | |
4488 | buffer[offset] = 0x70; | |
895f3022 | 4489 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
4490 | /* ILLEGAL REQUEST */ |
4491 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; | |
4492 | /* INVALID FIELD IN CDB */ | |
4493 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24; | |
4494 | break; | |
4495 | case TCM_CHECK_CONDITION_ABORT_CMD: | |
4496 | /* CURRENT ERROR */ | |
4497 | buffer[offset] = 0x70; | |
895f3022 | 4498 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
4499 | /* ABORTED COMMAND */ |
4500 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; | |
4501 | /* BUS DEVICE RESET FUNCTION OCCURRED */ | |
4502 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29; | |
4503 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03; | |
4504 | break; | |
4505 | case TCM_INCORRECT_AMOUNT_OF_DATA: | |
4506 | /* CURRENT ERROR */ | |
4507 | buffer[offset] = 0x70; | |
895f3022 | 4508 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
4509 | /* ABORTED COMMAND */ |
4510 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; | |
4511 | /* WRITE ERROR */ | |
4512 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c; | |
4513 | /* NOT ENOUGH UNSOLICITED DATA */ | |
4514 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d; | |
4515 | break; | |
4516 | case TCM_INVALID_CDB_FIELD: | |
4517 | /* CURRENT ERROR */ | |
4518 | buffer[offset] = 0x70; | |
895f3022 | 4519 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
9fbc8909 RD |
4520 | /* ILLEGAL REQUEST */ |
4521 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; | |
c66ac9db NB |
4522 | /* INVALID FIELD IN CDB */ |
4523 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24; | |
4524 | break; | |
4525 | case TCM_INVALID_PARAMETER_LIST: | |
4526 | /* CURRENT ERROR */ | |
4527 | buffer[offset] = 0x70; | |
895f3022 | 4528 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
9fbc8909 RD |
4529 | /* ILLEGAL REQUEST */ |
4530 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; | |
c66ac9db NB |
4531 | /* INVALID FIELD IN PARAMETER LIST */ |
4532 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26; | |
4533 | break; | |
4534 | case TCM_UNEXPECTED_UNSOLICITED_DATA: | |
4535 | /* CURRENT ERROR */ | |
4536 | buffer[offset] = 0x70; | |
895f3022 | 4537 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
4538 | /* ABORTED COMMAND */ |
4539 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; | |
4540 | /* WRITE ERROR */ | |
4541 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c; | |
4542 | /* UNEXPECTED_UNSOLICITED_DATA */ | |
4543 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c; | |
4544 | break; | |
4545 | case TCM_SERVICE_CRC_ERROR: | |
4546 | /* CURRENT ERROR */ | |
4547 | buffer[offset] = 0x70; | |
895f3022 | 4548 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
4549 | /* ABORTED COMMAND */ |
4550 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; | |
4551 | /* PROTOCOL SERVICE CRC ERROR */ | |
4552 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47; | |
4553 | /* N/A */ | |
4554 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05; | |
4555 | break; | |
4556 | case TCM_SNACK_REJECTED: | |
4557 | /* CURRENT ERROR */ | |
4558 | buffer[offset] = 0x70; | |
895f3022 | 4559 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
4560 | /* ABORTED COMMAND */ |
4561 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; | |
4562 | /* READ ERROR */ | |
4563 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11; | |
4564 | /* FAILED RETRANSMISSION REQUEST */ | |
4565 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13; | |
4566 | break; | |
4567 | case TCM_WRITE_PROTECTED: | |
4568 | /* CURRENT ERROR */ | |
4569 | buffer[offset] = 0x70; | |
895f3022 | 4570 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
4571 | /* DATA PROTECT */ |
4572 | buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT; | |
4573 | /* WRITE PROTECTED */ | |
4574 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27; | |
4575 | break; | |
4576 | case TCM_CHECK_CONDITION_UNIT_ATTENTION: | |
4577 | /* CURRENT ERROR */ | |
4578 | buffer[offset] = 0x70; | |
895f3022 | 4579 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
4580 | /* UNIT ATTENTION */ |
4581 | buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION; | |
4582 | core_scsi3_ua_for_check_condition(cmd, &asc, &ascq); | |
4583 | buffer[offset+SPC_ASC_KEY_OFFSET] = asc; | |
4584 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq; | |
4585 | break; | |
4586 | case TCM_CHECK_CONDITION_NOT_READY: | |
4587 | /* CURRENT ERROR */ | |
4588 | buffer[offset] = 0x70; | |
895f3022 | 4589 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
4590 | /* Not Ready */ |
4591 | buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY; | |
4592 | transport_get_sense_codes(cmd, &asc, &ascq); | |
4593 | buffer[offset+SPC_ASC_KEY_OFFSET] = asc; | |
4594 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq; | |
4595 | break; | |
4596 | case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE: | |
4597 | default: | |
4598 | /* CURRENT ERROR */ | |
4599 | buffer[offset] = 0x70; | |
895f3022 | 4600 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
4601 | /* ILLEGAL REQUEST */ |
4602 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; | |
4603 | /* LOGICAL UNIT COMMUNICATION FAILURE */ | |
4604 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80; | |
4605 | break; | |
4606 | } | |
4607 | /* | |
4608 | * This code uses linux/include/scsi/scsi.h SAM status codes! | |
4609 | */ | |
4610 | cmd->scsi_status = SAM_STAT_CHECK_CONDITION; | |
4611 | /* | |
4612 | * Automatically padded, this value is encoded in the fabric's | |
4613 | * data_length response PDU containing the SCSI defined sense data. | |
4614 | */ | |
4615 | cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset; | |
4616 | ||
4617 | after_reason: | |
07bde79a | 4618 | return cmd->se_tfo->queue_status(cmd); |
c66ac9db NB |
4619 | } |
4620 | EXPORT_SYMBOL(transport_send_check_condition_and_sense); | |
4621 | ||
4622 | int transport_check_aborted_status(struct se_cmd *cmd, int send_status) | |
4623 | { | |
4624 | int ret = 0; | |
4625 | ||
7d680f3b | 4626 | if (cmd->transport_state & CMD_T_ABORTED) { |
6708bb27 | 4627 | if (!send_status || |
c66ac9db NB |
4628 | (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS)) |
4629 | return 1; | |
4630 | #if 0 | |
6708bb27 | 4631 | pr_debug("Sending delayed SAM_STAT_TASK_ABORTED" |
c66ac9db | 4632 | " status for CDB: 0x%02x ITT: 0x%08x\n", |
a1d8b49a | 4633 | cmd->t_task_cdb[0], |
e3d6f909 | 4634 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db NB |
4635 | #endif |
4636 | cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS; | |
e3d6f909 | 4637 | cmd->se_tfo->queue_status(cmd); |
c66ac9db NB |
4638 | ret = 1; |
4639 | } | |
4640 | return ret; | |
4641 | } | |
4642 | EXPORT_SYMBOL(transport_check_aborted_status); | |
4643 | ||
4644 | void transport_send_task_abort(struct se_cmd *cmd) | |
4645 | { | |
c252f003 NB |
4646 | unsigned long flags; |
4647 | ||
4648 | spin_lock_irqsave(&cmd->t_state_lock, flags); | |
4649 | if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) { | |
4650 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
4651 | return; | |
4652 | } | |
4653 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
4654 | ||
c66ac9db NB |
4655 | /* |
4656 | * If there are still expected incoming fabric WRITEs, we wait | |
4657 | * until until they have completed before sending a TASK_ABORTED | |
4658 | * response. This response with TASK_ABORTED status will be | |
4659 | * queued back to fabric module by transport_check_aborted_status(). | |
4660 | */ | |
4661 | if (cmd->data_direction == DMA_TO_DEVICE) { | |
e3d6f909 | 4662 | if (cmd->se_tfo->write_pending_status(cmd) != 0) { |
7d680f3b | 4663 | cmd->transport_state |= CMD_T_ABORTED; |
c66ac9db | 4664 | smp_mb__after_atomic_inc(); |
c66ac9db NB |
4665 | } |
4666 | } | |
4667 | cmd->scsi_status = SAM_STAT_TASK_ABORTED; | |
4668 | #if 0 | |
6708bb27 | 4669 | pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x," |
a1d8b49a | 4670 | " ITT: 0x%08x\n", cmd->t_task_cdb[0], |
e3d6f909 | 4671 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 4672 | #endif |
e3d6f909 | 4673 | cmd->se_tfo->queue_status(cmd); |
c66ac9db NB |
4674 | } |
4675 | ||
e26d99ae | 4676 | static int transport_generic_do_tmr(struct se_cmd *cmd) |
c66ac9db | 4677 | { |
5951146d | 4678 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
4679 | struct se_tmr_req *tmr = cmd->se_tmr_req; |
4680 | int ret; | |
4681 | ||
4682 | switch (tmr->function) { | |
5c6cd613 | 4683 | case TMR_ABORT_TASK: |
c66ac9db NB |
4684 | tmr->response = TMR_FUNCTION_REJECTED; |
4685 | break; | |
5c6cd613 NB |
4686 | case TMR_ABORT_TASK_SET: |
4687 | case TMR_CLEAR_ACA: | |
4688 | case TMR_CLEAR_TASK_SET: | |
c66ac9db NB |
4689 | tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED; |
4690 | break; | |
5c6cd613 | 4691 | case TMR_LUN_RESET: |
c66ac9db NB |
4692 | ret = core_tmr_lun_reset(dev, tmr, NULL, NULL); |
4693 | tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE : | |
4694 | TMR_FUNCTION_REJECTED; | |
4695 | break; | |
5c6cd613 | 4696 | case TMR_TARGET_WARM_RESET: |
c66ac9db NB |
4697 | tmr->response = TMR_FUNCTION_REJECTED; |
4698 | break; | |
5c6cd613 | 4699 | case TMR_TARGET_COLD_RESET: |
c66ac9db NB |
4700 | tmr->response = TMR_FUNCTION_REJECTED; |
4701 | break; | |
c66ac9db | 4702 | default: |
6708bb27 | 4703 | pr_err("Uknown TMR function: 0x%02x.\n", |
c66ac9db NB |
4704 | tmr->function); |
4705 | tmr->response = TMR_FUNCTION_REJECTED; | |
4706 | break; | |
4707 | } | |
4708 | ||
4709 | cmd->t_state = TRANSPORT_ISTATE_PROCESSING; | |
e3d6f909 | 4710 | cmd->se_tfo->queue_tm_rsp(cmd); |
c66ac9db | 4711 | |
b7b8bef7 | 4712 | transport_cmd_check_stop_to_fabric(cmd); |
c66ac9db NB |
4713 | return 0; |
4714 | } | |
4715 | ||
c66ac9db NB |
4716 | /* transport_processing_thread(): |
4717 | * | |
4718 | * | |
4719 | */ | |
4720 | static int transport_processing_thread(void *param) | |
4721 | { | |
5951146d | 4722 | int ret; |
c66ac9db | 4723 | struct se_cmd *cmd; |
8359cf43 | 4724 | struct se_device *dev = param; |
c66ac9db | 4725 | |
c66ac9db | 4726 | while (!kthread_should_stop()) { |
e3d6f909 AG |
4727 | ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq, |
4728 | atomic_read(&dev->dev_queue_obj.queue_cnt) || | |
c66ac9db NB |
4729 | kthread_should_stop()); |
4730 | if (ret < 0) | |
4731 | goto out; | |
4732 | ||
c66ac9db | 4733 | get_cmd: |
5951146d AG |
4734 | cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj); |
4735 | if (!cmd) | |
c66ac9db NB |
4736 | continue; |
4737 | ||
5951146d | 4738 | switch (cmd->t_state) { |
680b73c5 CH |
4739 | case TRANSPORT_NEW_CMD: |
4740 | BUG(); | |
4741 | break; | |
c66ac9db | 4742 | case TRANSPORT_NEW_CMD_MAP: |
6708bb27 AG |
4743 | if (!cmd->se_tfo->new_cmd_map) { |
4744 | pr_err("cmd->se_tfo->new_cmd_map is" | |
c66ac9db NB |
4745 | " NULL for TRANSPORT_NEW_CMD_MAP\n"); |
4746 | BUG(); | |
4747 | } | |
e3d6f909 | 4748 | ret = cmd->se_tfo->new_cmd_map(cmd); |
c66ac9db | 4749 | if (ret < 0) { |
03e98c9e | 4750 | transport_generic_request_failure(cmd); |
c66ac9db NB |
4751 | break; |
4752 | } | |
c66ac9db | 4753 | ret = transport_generic_new_cmd(cmd); |
f147abb4 | 4754 | if (ret < 0) { |
03e98c9e NB |
4755 | transport_generic_request_failure(cmd); |
4756 | break; | |
c66ac9db NB |
4757 | } |
4758 | break; | |
4759 | case TRANSPORT_PROCESS_WRITE: | |
4760 | transport_generic_process_write(cmd); | |
4761 | break; | |
c66ac9db NB |
4762 | case TRANSPORT_PROCESS_TMR: |
4763 | transport_generic_do_tmr(cmd); | |
4764 | break; | |
07bde79a | 4765 | case TRANSPORT_COMPLETE_QF_WP: |
e057f533 CH |
4766 | transport_write_pending_qf(cmd); |
4767 | break; | |
4768 | case TRANSPORT_COMPLETE_QF_OK: | |
4769 | transport_complete_qf(cmd); | |
07bde79a | 4770 | break; |
c66ac9db | 4771 | default: |
f2da9dbd CH |
4772 | pr_err("Unknown t_state: %d for ITT: 0x%08x " |
4773 | "i_state: %d on SE LUN: %u\n", | |
4774 | cmd->t_state, | |
e3d6f909 AG |
4775 | cmd->se_tfo->get_task_tag(cmd), |
4776 | cmd->se_tfo->get_cmd_state(cmd), | |
4777 | cmd->se_lun->unpacked_lun); | |
c66ac9db NB |
4778 | BUG(); |
4779 | } | |
4780 | ||
4781 | goto get_cmd; | |
4782 | } | |
4783 | ||
4784 | out: | |
ce8762f6 NB |
4785 | WARN_ON(!list_empty(&dev->state_task_list)); |
4786 | WARN_ON(!list_empty(&dev->dev_queue_obj.qobj_list)); | |
c66ac9db NB |
4787 | dev->process_thread = NULL; |
4788 | return 0; | |
4789 | } |