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Commit | Line | Data |
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c66ac9db NB |
1 | /******************************************************************************* |
2 | * Filename: target_core_transport.c | |
3 | * | |
4 | * This file contains the Generic Target Engine Core. | |
5 | * | |
fd9a11d7 | 6 | * (c) Copyright 2002-2012 RisingTide Systems LLC. |
c66ac9db NB |
7 | * |
8 | * Nicholas A. Bellinger <nab@kernel.org> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
23 | * | |
24 | ******************************************************************************/ | |
25 | ||
c66ac9db NB |
26 | #include <linux/net.h> |
27 | #include <linux/delay.h> | |
28 | #include <linux/string.h> | |
29 | #include <linux/timer.h> | |
30 | #include <linux/slab.h> | |
31 | #include <linux/blkdev.h> | |
32 | #include <linux/spinlock.h> | |
c66ac9db NB |
33 | #include <linux/kthread.h> |
34 | #include <linux/in.h> | |
35 | #include <linux/cdrom.h> | |
827509e3 | 36 | #include <linux/module.h> |
015487b8 | 37 | #include <linux/ratelimit.h> |
c66ac9db NB |
38 | #include <asm/unaligned.h> |
39 | #include <net/sock.h> | |
40 | #include <net/tcp.h> | |
41 | #include <scsi/scsi.h> | |
42 | #include <scsi/scsi_cmnd.h> | |
e66ecd50 | 43 | #include <scsi/scsi_tcq.h> |
c66ac9db NB |
44 | |
45 | #include <target/target_core_base.h> | |
c4795fb2 CH |
46 | #include <target/target_core_backend.h> |
47 | #include <target/target_core_fabric.h> | |
c66ac9db NB |
48 | #include <target/target_core_configfs.h> |
49 | ||
e26d99ae | 50 | #include "target_core_internal.h" |
c66ac9db | 51 | #include "target_core_alua.h" |
c66ac9db | 52 | #include "target_core_pr.h" |
c66ac9db NB |
53 | #include "target_core_ua.h" |
54 | ||
e5c0d6ad RD |
55 | #define CREATE_TRACE_POINTS |
56 | #include <trace/events/target.h> | |
57 | ||
35e0e757 | 58 | static struct workqueue_struct *target_completion_wq; |
c66ac9db | 59 | static struct kmem_cache *se_sess_cache; |
c66ac9db | 60 | struct kmem_cache *se_ua_cache; |
c66ac9db NB |
61 | struct kmem_cache *t10_pr_reg_cache; |
62 | struct kmem_cache *t10_alua_lu_gp_cache; | |
63 | struct kmem_cache *t10_alua_lu_gp_mem_cache; | |
64 | struct kmem_cache *t10_alua_tg_pt_gp_cache; | |
65 | struct kmem_cache *t10_alua_tg_pt_gp_mem_cache; | |
66 | ||
c66ac9db | 67 | static void transport_complete_task_attr(struct se_cmd *cmd); |
07bde79a | 68 | static void transport_handle_queue_full(struct se_cmd *cmd, |
e057f533 | 69 | struct se_device *dev); |
d5ddad41 | 70 | static int transport_put_cmd(struct se_cmd *cmd); |
35e0e757 | 71 | static void target_complete_ok_work(struct work_struct *work); |
c66ac9db | 72 | |
e3d6f909 | 73 | int init_se_kmem_caches(void) |
c66ac9db | 74 | { |
c66ac9db NB |
75 | se_sess_cache = kmem_cache_create("se_sess_cache", |
76 | sizeof(struct se_session), __alignof__(struct se_session), | |
77 | 0, NULL); | |
6708bb27 AG |
78 | if (!se_sess_cache) { |
79 | pr_err("kmem_cache_create() for struct se_session" | |
c66ac9db | 80 | " failed\n"); |
c8e31f26 | 81 | goto out; |
c66ac9db NB |
82 | } |
83 | se_ua_cache = kmem_cache_create("se_ua_cache", | |
84 | sizeof(struct se_ua), __alignof__(struct se_ua), | |
85 | 0, NULL); | |
6708bb27 AG |
86 | if (!se_ua_cache) { |
87 | pr_err("kmem_cache_create() for struct se_ua failed\n"); | |
35e0e757 | 88 | goto out_free_sess_cache; |
c66ac9db | 89 | } |
c66ac9db NB |
90 | t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache", |
91 | sizeof(struct t10_pr_registration), | |
92 | __alignof__(struct t10_pr_registration), 0, NULL); | |
6708bb27 AG |
93 | if (!t10_pr_reg_cache) { |
94 | pr_err("kmem_cache_create() for struct t10_pr_registration" | |
c66ac9db | 95 | " failed\n"); |
35e0e757 | 96 | goto out_free_ua_cache; |
c66ac9db NB |
97 | } |
98 | t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache", | |
99 | sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp), | |
100 | 0, NULL); | |
6708bb27 AG |
101 | if (!t10_alua_lu_gp_cache) { |
102 | pr_err("kmem_cache_create() for t10_alua_lu_gp_cache" | |
c66ac9db | 103 | " failed\n"); |
35e0e757 | 104 | goto out_free_pr_reg_cache; |
c66ac9db NB |
105 | } |
106 | t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache", | |
107 | sizeof(struct t10_alua_lu_gp_member), | |
108 | __alignof__(struct t10_alua_lu_gp_member), 0, NULL); | |
6708bb27 AG |
109 | if (!t10_alua_lu_gp_mem_cache) { |
110 | pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_" | |
c66ac9db | 111 | "cache failed\n"); |
35e0e757 | 112 | goto out_free_lu_gp_cache; |
c66ac9db NB |
113 | } |
114 | t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache", | |
115 | sizeof(struct t10_alua_tg_pt_gp), | |
116 | __alignof__(struct t10_alua_tg_pt_gp), 0, NULL); | |
6708bb27 AG |
117 | if (!t10_alua_tg_pt_gp_cache) { |
118 | pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_" | |
c66ac9db | 119 | "cache failed\n"); |
35e0e757 | 120 | goto out_free_lu_gp_mem_cache; |
c66ac9db NB |
121 | } |
122 | t10_alua_tg_pt_gp_mem_cache = kmem_cache_create( | |
123 | "t10_alua_tg_pt_gp_mem_cache", | |
124 | sizeof(struct t10_alua_tg_pt_gp_member), | |
125 | __alignof__(struct t10_alua_tg_pt_gp_member), | |
126 | 0, NULL); | |
6708bb27 AG |
127 | if (!t10_alua_tg_pt_gp_mem_cache) { |
128 | pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_" | |
c66ac9db | 129 | "mem_t failed\n"); |
35e0e757 | 130 | goto out_free_tg_pt_gp_cache; |
c66ac9db NB |
131 | } |
132 | ||
35e0e757 CH |
133 | target_completion_wq = alloc_workqueue("target_completion", |
134 | WQ_MEM_RECLAIM, 0); | |
135 | if (!target_completion_wq) | |
136 | goto out_free_tg_pt_gp_mem_cache; | |
137 | ||
c66ac9db | 138 | return 0; |
35e0e757 CH |
139 | |
140 | out_free_tg_pt_gp_mem_cache: | |
141 | kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache); | |
142 | out_free_tg_pt_gp_cache: | |
143 | kmem_cache_destroy(t10_alua_tg_pt_gp_cache); | |
144 | out_free_lu_gp_mem_cache: | |
145 | kmem_cache_destroy(t10_alua_lu_gp_mem_cache); | |
146 | out_free_lu_gp_cache: | |
147 | kmem_cache_destroy(t10_alua_lu_gp_cache); | |
148 | out_free_pr_reg_cache: | |
149 | kmem_cache_destroy(t10_pr_reg_cache); | |
150 | out_free_ua_cache: | |
151 | kmem_cache_destroy(se_ua_cache); | |
152 | out_free_sess_cache: | |
153 | kmem_cache_destroy(se_sess_cache); | |
c66ac9db | 154 | out: |
e3d6f909 | 155 | return -ENOMEM; |
c66ac9db NB |
156 | } |
157 | ||
e3d6f909 | 158 | void release_se_kmem_caches(void) |
c66ac9db | 159 | { |
35e0e757 | 160 | destroy_workqueue(target_completion_wq); |
c66ac9db NB |
161 | kmem_cache_destroy(se_sess_cache); |
162 | kmem_cache_destroy(se_ua_cache); | |
c66ac9db NB |
163 | kmem_cache_destroy(t10_pr_reg_cache); |
164 | kmem_cache_destroy(t10_alua_lu_gp_cache); | |
165 | kmem_cache_destroy(t10_alua_lu_gp_mem_cache); | |
166 | kmem_cache_destroy(t10_alua_tg_pt_gp_cache); | |
167 | kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache); | |
c66ac9db NB |
168 | } |
169 | ||
e3d6f909 AG |
170 | /* This code ensures unique mib indexes are handed out. */ |
171 | static DEFINE_SPINLOCK(scsi_mib_index_lock); | |
172 | static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX]; | |
e89d15ee NB |
173 | |
174 | /* | |
175 | * Allocate a new row index for the entry type specified | |
176 | */ | |
177 | u32 scsi_get_new_index(scsi_index_t type) | |
178 | { | |
179 | u32 new_index; | |
180 | ||
e3d6f909 | 181 | BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX)); |
e89d15ee | 182 | |
e3d6f909 AG |
183 | spin_lock(&scsi_mib_index_lock); |
184 | new_index = ++scsi_mib_index[type]; | |
185 | spin_unlock(&scsi_mib_index_lock); | |
e89d15ee NB |
186 | |
187 | return new_index; | |
188 | } | |
189 | ||
dbc5623e | 190 | void transport_subsystem_check_init(void) |
c66ac9db NB |
191 | { |
192 | int ret; | |
283669d2 | 193 | static int sub_api_initialized; |
c66ac9db | 194 | |
dbc5623e NB |
195 | if (sub_api_initialized) |
196 | return; | |
197 | ||
c66ac9db NB |
198 | ret = request_module("target_core_iblock"); |
199 | if (ret != 0) | |
6708bb27 | 200 | pr_err("Unable to load target_core_iblock\n"); |
c66ac9db NB |
201 | |
202 | ret = request_module("target_core_file"); | |
203 | if (ret != 0) | |
6708bb27 | 204 | pr_err("Unable to load target_core_file\n"); |
c66ac9db NB |
205 | |
206 | ret = request_module("target_core_pscsi"); | |
207 | if (ret != 0) | |
6708bb27 | 208 | pr_err("Unable to load target_core_pscsi\n"); |
c66ac9db | 209 | |
e3d6f909 | 210 | sub_api_initialized = 1; |
c66ac9db NB |
211 | } |
212 | ||
213 | struct se_session *transport_init_session(void) | |
214 | { | |
215 | struct se_session *se_sess; | |
216 | ||
217 | se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL); | |
6708bb27 AG |
218 | if (!se_sess) { |
219 | pr_err("Unable to allocate struct se_session from" | |
c66ac9db NB |
220 | " se_sess_cache\n"); |
221 | return ERR_PTR(-ENOMEM); | |
222 | } | |
223 | INIT_LIST_HEAD(&se_sess->sess_list); | |
224 | INIT_LIST_HEAD(&se_sess->sess_acl_list); | |
a17f091d | 225 | INIT_LIST_HEAD(&se_sess->sess_cmd_list); |
9b31a328 | 226 | INIT_LIST_HEAD(&se_sess->sess_wait_list); |
a17f091d | 227 | spin_lock_init(&se_sess->sess_cmd_lock); |
41ac82b6 | 228 | kref_init(&se_sess->sess_kref); |
c66ac9db NB |
229 | |
230 | return se_sess; | |
231 | } | |
232 | EXPORT_SYMBOL(transport_init_session); | |
233 | ||
c0add7fd NB |
234 | int transport_alloc_session_tags(struct se_session *se_sess, |
235 | unsigned int tag_num, unsigned int tag_size) | |
236 | { | |
237 | int rc; | |
238 | ||
239 | se_sess->sess_cmd_map = kzalloc(tag_num * tag_size, GFP_KERNEL); | |
240 | if (!se_sess->sess_cmd_map) { | |
241 | pr_err("Unable to allocate se_sess->sess_cmd_map\n"); | |
242 | return -ENOMEM; | |
243 | } | |
244 | ||
245 | rc = percpu_ida_init(&se_sess->sess_tag_pool, tag_num); | |
246 | if (rc < 0) { | |
247 | pr_err("Unable to init se_sess->sess_tag_pool," | |
248 | " tag_num: %u\n", tag_num); | |
249 | kfree(se_sess->sess_cmd_map); | |
250 | se_sess->sess_cmd_map = NULL; | |
251 | return -ENOMEM; | |
252 | } | |
253 | ||
254 | return 0; | |
255 | } | |
256 | EXPORT_SYMBOL(transport_alloc_session_tags); | |
257 | ||
258 | struct se_session *transport_init_session_tags(unsigned int tag_num, | |
259 | unsigned int tag_size) | |
260 | { | |
261 | struct se_session *se_sess; | |
262 | int rc; | |
263 | ||
264 | se_sess = transport_init_session(); | |
265 | if (IS_ERR(se_sess)) | |
266 | return se_sess; | |
267 | ||
268 | rc = transport_alloc_session_tags(se_sess, tag_num, tag_size); | |
269 | if (rc < 0) { | |
270 | transport_free_session(se_sess); | |
271 | return ERR_PTR(-ENOMEM); | |
272 | } | |
273 | ||
274 | return se_sess; | |
275 | } | |
276 | EXPORT_SYMBOL(transport_init_session_tags); | |
277 | ||
c66ac9db | 278 | /* |
140854cb | 279 | * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called. |
c66ac9db NB |
280 | */ |
281 | void __transport_register_session( | |
282 | struct se_portal_group *se_tpg, | |
283 | struct se_node_acl *se_nacl, | |
284 | struct se_session *se_sess, | |
285 | void *fabric_sess_ptr) | |
286 | { | |
287 | unsigned char buf[PR_REG_ISID_LEN]; | |
288 | ||
289 | se_sess->se_tpg = se_tpg; | |
290 | se_sess->fabric_sess_ptr = fabric_sess_ptr; | |
291 | /* | |
292 | * Used by struct se_node_acl's under ConfigFS to locate active se_session-t | |
293 | * | |
294 | * Only set for struct se_session's that will actually be moving I/O. | |
295 | * eg: *NOT* discovery sessions. | |
296 | */ | |
297 | if (se_nacl) { | |
298 | /* | |
299 | * If the fabric module supports an ISID based TransportID, | |
300 | * save this value in binary from the fabric I_T Nexus now. | |
301 | */ | |
e3d6f909 | 302 | if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { |
c66ac9db | 303 | memset(&buf[0], 0, PR_REG_ISID_LEN); |
e3d6f909 | 304 | se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, |
c66ac9db NB |
305 | &buf[0], PR_REG_ISID_LEN); |
306 | se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]); | |
307 | } | |
afb999ff NB |
308 | kref_get(&se_nacl->acl_kref); |
309 | ||
c66ac9db NB |
310 | spin_lock_irq(&se_nacl->nacl_sess_lock); |
311 | /* | |
312 | * The se_nacl->nacl_sess pointer will be set to the | |
313 | * last active I_T Nexus for each struct se_node_acl. | |
314 | */ | |
315 | se_nacl->nacl_sess = se_sess; | |
316 | ||
317 | list_add_tail(&se_sess->sess_acl_list, | |
318 | &se_nacl->acl_sess_list); | |
319 | spin_unlock_irq(&se_nacl->nacl_sess_lock); | |
320 | } | |
321 | list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list); | |
322 | ||
6708bb27 | 323 | pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n", |
e3d6f909 | 324 | se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr); |
c66ac9db NB |
325 | } |
326 | EXPORT_SYMBOL(__transport_register_session); | |
327 | ||
328 | void transport_register_session( | |
329 | struct se_portal_group *se_tpg, | |
330 | struct se_node_acl *se_nacl, | |
331 | struct se_session *se_sess, | |
332 | void *fabric_sess_ptr) | |
333 | { | |
140854cb NB |
334 | unsigned long flags; |
335 | ||
336 | spin_lock_irqsave(&se_tpg->session_lock, flags); | |
c66ac9db | 337 | __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr); |
140854cb | 338 | spin_unlock_irqrestore(&se_tpg->session_lock, flags); |
c66ac9db NB |
339 | } |
340 | EXPORT_SYMBOL(transport_register_session); | |
341 | ||
ecf0dd66 | 342 | static void target_release_session(struct kref *kref) |
41ac82b6 NB |
343 | { |
344 | struct se_session *se_sess = container_of(kref, | |
345 | struct se_session, sess_kref); | |
346 | struct se_portal_group *se_tpg = se_sess->se_tpg; | |
347 | ||
348 | se_tpg->se_tpg_tfo->close_session(se_sess); | |
349 | } | |
350 | ||
351 | void target_get_session(struct se_session *se_sess) | |
352 | { | |
353 | kref_get(&se_sess->sess_kref); | |
354 | } | |
355 | EXPORT_SYMBOL(target_get_session); | |
356 | ||
33933a0e | 357 | void target_put_session(struct se_session *se_sess) |
41ac82b6 | 358 | { |
4149268e JE |
359 | struct se_portal_group *tpg = se_sess->se_tpg; |
360 | ||
361 | if (tpg->se_tpg_tfo->put_session != NULL) { | |
362 | tpg->se_tpg_tfo->put_session(se_sess); | |
363 | return; | |
364 | } | |
33933a0e | 365 | kref_put(&se_sess->sess_kref, target_release_session); |
41ac82b6 NB |
366 | } |
367 | EXPORT_SYMBOL(target_put_session); | |
368 | ||
afb999ff NB |
369 | static void target_complete_nacl(struct kref *kref) |
370 | { | |
371 | struct se_node_acl *nacl = container_of(kref, | |
372 | struct se_node_acl, acl_kref); | |
373 | ||
374 | complete(&nacl->acl_free_comp); | |
375 | } | |
376 | ||
377 | void target_put_nacl(struct se_node_acl *nacl) | |
378 | { | |
379 | kref_put(&nacl->acl_kref, target_complete_nacl); | |
380 | } | |
381 | ||
c66ac9db NB |
382 | void transport_deregister_session_configfs(struct se_session *se_sess) |
383 | { | |
384 | struct se_node_acl *se_nacl; | |
23388864 | 385 | unsigned long flags; |
c66ac9db NB |
386 | /* |
387 | * Used by struct se_node_acl's under ConfigFS to locate active struct se_session | |
388 | */ | |
389 | se_nacl = se_sess->se_node_acl; | |
6708bb27 | 390 | if (se_nacl) { |
23388864 | 391 | spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags); |
337c0607 NB |
392 | if (se_nacl->acl_stop == 0) |
393 | list_del(&se_sess->sess_acl_list); | |
c66ac9db NB |
394 | /* |
395 | * If the session list is empty, then clear the pointer. | |
396 | * Otherwise, set the struct se_session pointer from the tail | |
397 | * element of the per struct se_node_acl active session list. | |
398 | */ | |
399 | if (list_empty(&se_nacl->acl_sess_list)) | |
400 | se_nacl->nacl_sess = NULL; | |
401 | else { | |
402 | se_nacl->nacl_sess = container_of( | |
403 | se_nacl->acl_sess_list.prev, | |
404 | struct se_session, sess_acl_list); | |
405 | } | |
23388864 | 406 | spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags); |
c66ac9db NB |
407 | } |
408 | } | |
409 | EXPORT_SYMBOL(transport_deregister_session_configfs); | |
410 | ||
411 | void transport_free_session(struct se_session *se_sess) | |
412 | { | |
c0add7fd NB |
413 | if (se_sess->sess_cmd_map) { |
414 | percpu_ida_destroy(&se_sess->sess_tag_pool); | |
415 | kfree(se_sess->sess_cmd_map); | |
416 | } | |
c66ac9db NB |
417 | kmem_cache_free(se_sess_cache, se_sess); |
418 | } | |
419 | EXPORT_SYMBOL(transport_free_session); | |
420 | ||
421 | void transport_deregister_session(struct se_session *se_sess) | |
422 | { | |
423 | struct se_portal_group *se_tpg = se_sess->se_tpg; | |
01468346 | 424 | struct target_core_fabric_ops *se_tfo; |
c66ac9db | 425 | struct se_node_acl *se_nacl; |
e63a8e19 | 426 | unsigned long flags; |
01468346 | 427 | bool comp_nacl = true; |
c66ac9db | 428 | |
6708bb27 | 429 | if (!se_tpg) { |
c66ac9db NB |
430 | transport_free_session(se_sess); |
431 | return; | |
432 | } | |
01468346 | 433 | se_tfo = se_tpg->se_tpg_tfo; |
c66ac9db | 434 | |
e63a8e19 | 435 | spin_lock_irqsave(&se_tpg->session_lock, flags); |
c66ac9db NB |
436 | list_del(&se_sess->sess_list); |
437 | se_sess->se_tpg = NULL; | |
438 | se_sess->fabric_sess_ptr = NULL; | |
e63a8e19 | 439 | spin_unlock_irqrestore(&se_tpg->session_lock, flags); |
c66ac9db NB |
440 | |
441 | /* | |
442 | * Determine if we need to do extra work for this initiator node's | |
443 | * struct se_node_acl if it had been previously dynamically generated. | |
444 | */ | |
445 | se_nacl = se_sess->se_node_acl; | |
01468346 NB |
446 | |
447 | spin_lock_irqsave(&se_tpg->acl_node_lock, flags); | |
448 | if (se_nacl && se_nacl->dynamic_node_acl) { | |
449 | if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) { | |
450 | list_del(&se_nacl->acl_list); | |
451 | se_tpg->num_node_acls--; | |
452 | spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags); | |
453 | core_tpg_wait_for_nacl_pr_ref(se_nacl); | |
454 | core_free_device_list_for_node(se_nacl, se_tpg); | |
455 | se_tfo->tpg_release_fabric_acl(se_tpg, se_nacl); | |
456 | ||
457 | comp_nacl = false; | |
458 | spin_lock_irqsave(&se_tpg->acl_node_lock, flags); | |
c66ac9db | 459 | } |
c66ac9db | 460 | } |
01468346 | 461 | spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags); |
c66ac9db | 462 | |
6708bb27 | 463 | pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n", |
e3d6f909 | 464 | se_tpg->se_tpg_tfo->get_fabric_name()); |
01468346 | 465 | /* |
afb999ff NB |
466 | * If last kref is dropping now for an explict NodeACL, awake sleeping |
467 | * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group | |
468 | * removal context. | |
01468346 NB |
469 | */ |
470 | if (se_nacl && comp_nacl == true) | |
afb999ff | 471 | target_put_nacl(se_nacl); |
01468346 | 472 | |
afb999ff | 473 | transport_free_session(se_sess); |
c66ac9db NB |
474 | } |
475 | EXPORT_SYMBOL(transport_deregister_session); | |
476 | ||
477 | /* | |
a1d8b49a | 478 | * Called with cmd->t_state_lock held. |
c66ac9db | 479 | */ |
cf572a96 | 480 | static void target_remove_from_state_list(struct se_cmd *cmd) |
c66ac9db | 481 | { |
42bf829e | 482 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
483 | unsigned long flags; |
484 | ||
42bf829e CH |
485 | if (!dev) |
486 | return; | |
c66ac9db | 487 | |
cf572a96 CH |
488 | if (cmd->transport_state & CMD_T_BUSY) |
489 | return; | |
c66ac9db | 490 | |
cf572a96 CH |
491 | spin_lock_irqsave(&dev->execute_task_lock, flags); |
492 | if (cmd->state_active) { | |
493 | list_del(&cmd->state_list); | |
cf572a96 | 494 | cmd->state_active = false; |
c66ac9db | 495 | } |
cf572a96 | 496 | spin_unlock_irqrestore(&dev->execute_task_lock, flags); |
c66ac9db NB |
497 | } |
498 | ||
862e6389 NB |
499 | static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists, |
500 | bool write_pending) | |
c66ac9db NB |
501 | { |
502 | unsigned long flags; | |
503 | ||
a1d8b49a | 504 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
862e6389 NB |
505 | if (write_pending) |
506 | cmd->t_state = TRANSPORT_WRITE_PENDING; | |
507 | ||
c66ac9db NB |
508 | /* |
509 | * Determine if IOCTL context caller in requesting the stopping of this | |
510 | * command for LUN shutdown purposes. | |
511 | */ | |
7d680f3b CH |
512 | if (cmd->transport_state & CMD_T_LUN_STOP) { |
513 | pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n", | |
514 | __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd)); | |
c66ac9db | 515 | |
7d680f3b | 516 | cmd->transport_state &= ~CMD_T_ACTIVE; |
f7113a47 | 517 | if (remove_from_lists) |
cf572a96 | 518 | target_remove_from_state_list(cmd); |
a1d8b49a | 519 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 520 | |
a1d8b49a | 521 | complete(&cmd->transport_lun_stop_comp); |
c66ac9db NB |
522 | return 1; |
523 | } | |
f7113a47 CH |
524 | |
525 | if (remove_from_lists) { | |
526 | target_remove_from_state_list(cmd); | |
527 | ||
528 | /* | |
529 | * Clear struct se_cmd->se_lun before the handoff to FE. | |
530 | */ | |
531 | cmd->se_lun = NULL; | |
532 | } | |
533 | ||
c66ac9db NB |
534 | /* |
535 | * Determine if frontend context caller is requesting the stopping of | |
e3d6f909 | 536 | * this command for frontend exceptions. |
c66ac9db | 537 | */ |
7d680f3b CH |
538 | if (cmd->transport_state & CMD_T_STOP) { |
539 | pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n", | |
540 | __func__, __LINE__, | |
e3d6f909 | 541 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 542 | |
a1d8b49a | 543 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 544 | |
a1d8b49a | 545 | complete(&cmd->t_transport_stop_comp); |
c66ac9db NB |
546 | return 1; |
547 | } | |
f7113a47 CH |
548 | |
549 | cmd->transport_state &= ~CMD_T_ACTIVE; | |
550 | if (remove_from_lists) { | |
551 | /* | |
552 | * Some fabric modules like tcm_loop can release | |
553 | * their internally allocated I/O reference now and | |
554 | * struct se_cmd now. | |
555 | * | |
556 | * Fabric modules are expected to return '1' here if the | |
557 | * se_cmd being passed is released at this point, | |
558 | * or zero if not being released. | |
559 | */ | |
560 | if (cmd->se_tfo->check_stop_free != NULL) { | |
561 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
562 | return cmd->se_tfo->check_stop_free(cmd); | |
c66ac9db | 563 | } |
f7113a47 | 564 | } |
c66ac9db | 565 | |
a1d8b49a | 566 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
567 | return 0; |
568 | } | |
569 | ||
570 | static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd) | |
571 | { | |
862e6389 | 572 | return transport_cmd_check_stop(cmd, true, false); |
c66ac9db NB |
573 | } |
574 | ||
575 | static void transport_lun_remove_cmd(struct se_cmd *cmd) | |
576 | { | |
e3d6f909 | 577 | struct se_lun *lun = cmd->se_lun; |
c66ac9db NB |
578 | unsigned long flags; |
579 | ||
580 | if (!lun) | |
581 | return; | |
582 | ||
c66ac9db | 583 | spin_lock_irqsave(&lun->lun_cmd_lock, flags); |
3d26fea0 CH |
584 | if (!list_empty(&cmd->se_lun_node)) |
585 | list_del_init(&cmd->se_lun_node); | |
c66ac9db NB |
586 | spin_unlock_irqrestore(&lun->lun_cmd_lock, flags); |
587 | } | |
588 | ||
589 | void transport_cmd_finish_abort(struct se_cmd *cmd, int remove) | |
590 | { | |
c66ac9db NB |
591 | if (transport_cmd_check_stop_to_fabric(cmd)) |
592 | return; | |
af877292 | 593 | if (remove) |
e6a2573f | 594 | transport_put_cmd(cmd); |
c66ac9db NB |
595 | } |
596 | ||
35e0e757 CH |
597 | static void target_complete_failure_work(struct work_struct *work) |
598 | { | |
599 | struct se_cmd *cmd = container_of(work, struct se_cmd, work); | |
600 | ||
de103c93 CH |
601 | transport_generic_request_failure(cmd, |
602 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE); | |
35e0e757 CH |
603 | } |
604 | ||
6138ed2a | 605 | /* |
d5829eac PB |
606 | * Used when asking transport to copy Sense Data from the underlying |
607 | * Linux/SCSI struct scsi_cmnd | |
6138ed2a | 608 | */ |
d5829eac | 609 | static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd) |
6138ed2a | 610 | { |
6138ed2a | 611 | struct se_device *dev = cmd->se_dev; |
6138ed2a PB |
612 | |
613 | WARN_ON(!cmd->se_lun); | |
614 | ||
615 | if (!dev) | |
d5829eac | 616 | return NULL; |
6138ed2a | 617 | |
d5829eac PB |
618 | if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) |
619 | return NULL; | |
6138ed2a | 620 | |
9c58b7dd | 621 | cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER; |
6138ed2a | 622 | |
d5829eac | 623 | pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n", |
6138ed2a | 624 | dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status); |
9c58b7dd | 625 | return cmd->sense_buffer; |
6138ed2a PB |
626 | } |
627 | ||
5787cacd | 628 | void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status) |
c66ac9db | 629 | { |
42bf829e | 630 | struct se_device *dev = cmd->se_dev; |
5787cacd | 631 | int success = scsi_status == GOOD; |
c66ac9db | 632 | unsigned long flags; |
c66ac9db | 633 | |
5787cacd CH |
634 | cmd->scsi_status = scsi_status; |
635 | ||
636 | ||
a1d8b49a | 637 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
cf572a96 | 638 | cmd->transport_state &= ~CMD_T_BUSY; |
c66ac9db | 639 | |
c66ac9db | 640 | if (dev && dev->transport->transport_complete) { |
d5829eac PB |
641 | dev->transport->transport_complete(cmd, |
642 | cmd->t_data_sg, | |
643 | transport_get_sense_buffer(cmd)); | |
644 | if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) | |
c66ac9db | 645 | success = 1; |
c66ac9db NB |
646 | } |
647 | ||
648 | /* | |
5787cacd | 649 | * See if we are waiting to complete for an exception condition. |
c66ac9db | 650 | */ |
cf572a96 | 651 | if (cmd->transport_state & CMD_T_REQUEST_STOP) { |
a1d8b49a | 652 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
cf572a96 | 653 | complete(&cmd->task_stop_comp); |
c66ac9db NB |
654 | return; |
655 | } | |
2235007c CH |
656 | |
657 | if (!success) | |
7d680f3b | 658 | cmd->transport_state |= CMD_T_FAILED; |
2235007c | 659 | |
3d28934a NB |
660 | /* |
661 | * Check for case where an explict ABORT_TASK has been received | |
662 | * and transport_wait_for_tasks() will be waiting for completion.. | |
663 | */ | |
664 | if (cmd->transport_state & CMD_T_ABORTED && | |
665 | cmd->transport_state & CMD_T_STOP) { | |
666 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
667 | complete(&cmd->t_transport_stop_comp); | |
668 | return; | |
669 | } else if (cmd->transport_state & CMD_T_FAILED) { | |
35e0e757 | 670 | INIT_WORK(&cmd->work, target_complete_failure_work); |
c66ac9db | 671 | } else { |
35e0e757 | 672 | INIT_WORK(&cmd->work, target_complete_ok_work); |
c66ac9db | 673 | } |
35e0e757 | 674 | |
35e0e757 | 675 | cmd->t_state = TRANSPORT_COMPLETE; |
3d28934a | 676 | cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE); |
a1d8b49a | 677 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 678 | |
35e0e757 | 679 | queue_work(target_completion_wq, &cmd->work); |
c66ac9db | 680 | } |
6bb35e00 CH |
681 | EXPORT_SYMBOL(target_complete_cmd); |
682 | ||
cf572a96 | 683 | static void target_add_to_state_list(struct se_cmd *cmd) |
c66ac9db | 684 | { |
cf572a96 CH |
685 | struct se_device *dev = cmd->se_dev; |
686 | unsigned long flags; | |
c66ac9db | 687 | |
cf572a96 CH |
688 | spin_lock_irqsave(&dev->execute_task_lock, flags); |
689 | if (!cmd->state_active) { | |
690 | list_add_tail(&cmd->state_list, &dev->state_list); | |
691 | cmd->state_active = true; | |
c66ac9db | 692 | } |
cf572a96 | 693 | spin_unlock_irqrestore(&dev->execute_task_lock, flags); |
c66ac9db NB |
694 | } |
695 | ||
07bde79a | 696 | /* |
f147abb4 | 697 | * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status |
07bde79a | 698 | */ |
7a6f0a1e CH |
699 | static void transport_write_pending_qf(struct se_cmd *cmd); |
700 | static void transport_complete_qf(struct se_cmd *cmd); | |
07bde79a | 701 | |
0fd97ccf | 702 | void target_qf_do_work(struct work_struct *work) |
07bde79a NB |
703 | { |
704 | struct se_device *dev = container_of(work, struct se_device, | |
705 | qf_work_queue); | |
bcac364a | 706 | LIST_HEAD(qf_cmd_list); |
07bde79a NB |
707 | struct se_cmd *cmd, *cmd_tmp; |
708 | ||
709 | spin_lock_irq(&dev->qf_cmd_lock); | |
bcac364a RD |
710 | list_splice_init(&dev->qf_cmd_list, &qf_cmd_list); |
711 | spin_unlock_irq(&dev->qf_cmd_lock); | |
07bde79a | 712 | |
bcac364a | 713 | list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) { |
07bde79a NB |
714 | list_del(&cmd->se_qf_node); |
715 | atomic_dec(&dev->dev_qf_count); | |
716 | smp_mb__after_atomic_dec(); | |
07bde79a | 717 | |
6708bb27 | 718 | pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue" |
07bde79a | 719 | " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd, |
e057f533 | 720 | (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" : |
07bde79a NB |
721 | (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING" |
722 | : "UNKNOWN"); | |
f7a5cc0b | 723 | |
7a6f0a1e CH |
724 | if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) |
725 | transport_write_pending_qf(cmd); | |
726 | else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) | |
727 | transport_complete_qf(cmd); | |
07bde79a | 728 | } |
07bde79a NB |
729 | } |
730 | ||
c66ac9db NB |
731 | unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd) |
732 | { | |
733 | switch (cmd->data_direction) { | |
734 | case DMA_NONE: | |
735 | return "NONE"; | |
736 | case DMA_FROM_DEVICE: | |
737 | return "READ"; | |
738 | case DMA_TO_DEVICE: | |
739 | return "WRITE"; | |
740 | case DMA_BIDIRECTIONAL: | |
741 | return "BIDI"; | |
742 | default: | |
743 | break; | |
744 | } | |
745 | ||
746 | return "UNKNOWN"; | |
747 | } | |
748 | ||
749 | void transport_dump_dev_state( | |
750 | struct se_device *dev, | |
751 | char *b, | |
752 | int *bl) | |
753 | { | |
754 | *bl += sprintf(b + *bl, "Status: "); | |
0fd97ccf | 755 | if (dev->export_count) |
c66ac9db | 756 | *bl += sprintf(b + *bl, "ACTIVATED"); |
0fd97ccf | 757 | else |
c66ac9db | 758 | *bl += sprintf(b + *bl, "DEACTIVATED"); |
c66ac9db | 759 | |
5f41a31d | 760 | *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth); |
11e764bd | 761 | *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n", |
0fd97ccf CH |
762 | dev->dev_attrib.block_size, |
763 | dev->dev_attrib.hw_max_sectors); | |
c66ac9db NB |
764 | *bl += sprintf(b + *bl, " "); |
765 | } | |
766 | ||
c66ac9db NB |
767 | void transport_dump_vpd_proto_id( |
768 | struct t10_vpd *vpd, | |
769 | unsigned char *p_buf, | |
770 | int p_buf_len) | |
771 | { | |
772 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
773 | int len; | |
774 | ||
775 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
776 | len = sprintf(buf, "T10 VPD Protocol Identifier: "); | |
777 | ||
778 | switch (vpd->protocol_identifier) { | |
779 | case 0x00: | |
780 | sprintf(buf+len, "Fibre Channel\n"); | |
781 | break; | |
782 | case 0x10: | |
783 | sprintf(buf+len, "Parallel SCSI\n"); | |
784 | break; | |
785 | case 0x20: | |
786 | sprintf(buf+len, "SSA\n"); | |
787 | break; | |
788 | case 0x30: | |
789 | sprintf(buf+len, "IEEE 1394\n"); | |
790 | break; | |
791 | case 0x40: | |
792 | sprintf(buf+len, "SCSI Remote Direct Memory Access" | |
793 | " Protocol\n"); | |
794 | break; | |
795 | case 0x50: | |
796 | sprintf(buf+len, "Internet SCSI (iSCSI)\n"); | |
797 | break; | |
798 | case 0x60: | |
799 | sprintf(buf+len, "SAS Serial SCSI Protocol\n"); | |
800 | break; | |
801 | case 0x70: | |
802 | sprintf(buf+len, "Automation/Drive Interface Transport" | |
803 | " Protocol\n"); | |
804 | break; | |
805 | case 0x80: | |
806 | sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n"); | |
807 | break; | |
808 | default: | |
809 | sprintf(buf+len, "Unknown 0x%02x\n", | |
810 | vpd->protocol_identifier); | |
811 | break; | |
812 | } | |
813 | ||
814 | if (p_buf) | |
815 | strncpy(p_buf, buf, p_buf_len); | |
816 | else | |
6708bb27 | 817 | pr_debug("%s", buf); |
c66ac9db NB |
818 | } |
819 | ||
820 | void | |
821 | transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83) | |
822 | { | |
823 | /* | |
824 | * Check if the Protocol Identifier Valid (PIV) bit is set.. | |
825 | * | |
826 | * from spc3r23.pdf section 7.5.1 | |
827 | */ | |
828 | if (page_83[1] & 0x80) { | |
829 | vpd->protocol_identifier = (page_83[0] & 0xf0); | |
830 | vpd->protocol_identifier_set = 1; | |
831 | transport_dump_vpd_proto_id(vpd, NULL, 0); | |
832 | } | |
833 | } | |
834 | EXPORT_SYMBOL(transport_set_vpd_proto_id); | |
835 | ||
836 | int transport_dump_vpd_assoc( | |
837 | struct t10_vpd *vpd, | |
838 | unsigned char *p_buf, | |
839 | int p_buf_len) | |
840 | { | |
841 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
e3d6f909 AG |
842 | int ret = 0; |
843 | int len; | |
c66ac9db NB |
844 | |
845 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
846 | len = sprintf(buf, "T10 VPD Identifier Association: "); | |
847 | ||
848 | switch (vpd->association) { | |
849 | case 0x00: | |
850 | sprintf(buf+len, "addressed logical unit\n"); | |
851 | break; | |
852 | case 0x10: | |
853 | sprintf(buf+len, "target port\n"); | |
854 | break; | |
855 | case 0x20: | |
856 | sprintf(buf+len, "SCSI target device\n"); | |
857 | break; | |
858 | default: | |
859 | sprintf(buf+len, "Unknown 0x%02x\n", vpd->association); | |
e3d6f909 | 860 | ret = -EINVAL; |
c66ac9db NB |
861 | break; |
862 | } | |
863 | ||
864 | if (p_buf) | |
865 | strncpy(p_buf, buf, p_buf_len); | |
866 | else | |
6708bb27 | 867 | pr_debug("%s", buf); |
c66ac9db NB |
868 | |
869 | return ret; | |
870 | } | |
871 | ||
872 | int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83) | |
873 | { | |
874 | /* | |
875 | * The VPD identification association.. | |
876 | * | |
877 | * from spc3r23.pdf Section 7.6.3.1 Table 297 | |
878 | */ | |
879 | vpd->association = (page_83[1] & 0x30); | |
880 | return transport_dump_vpd_assoc(vpd, NULL, 0); | |
881 | } | |
882 | EXPORT_SYMBOL(transport_set_vpd_assoc); | |
883 | ||
884 | int transport_dump_vpd_ident_type( | |
885 | struct t10_vpd *vpd, | |
886 | unsigned char *p_buf, | |
887 | int p_buf_len) | |
888 | { | |
889 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
e3d6f909 AG |
890 | int ret = 0; |
891 | int len; | |
c66ac9db NB |
892 | |
893 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
894 | len = sprintf(buf, "T10 VPD Identifier Type: "); | |
895 | ||
896 | switch (vpd->device_identifier_type) { | |
897 | case 0x00: | |
898 | sprintf(buf+len, "Vendor specific\n"); | |
899 | break; | |
900 | case 0x01: | |
901 | sprintf(buf+len, "T10 Vendor ID based\n"); | |
902 | break; | |
903 | case 0x02: | |
904 | sprintf(buf+len, "EUI-64 based\n"); | |
905 | break; | |
906 | case 0x03: | |
907 | sprintf(buf+len, "NAA\n"); | |
908 | break; | |
909 | case 0x04: | |
910 | sprintf(buf+len, "Relative target port identifier\n"); | |
911 | break; | |
912 | case 0x08: | |
913 | sprintf(buf+len, "SCSI name string\n"); | |
914 | break; | |
915 | default: | |
916 | sprintf(buf+len, "Unsupported: 0x%02x\n", | |
917 | vpd->device_identifier_type); | |
e3d6f909 | 918 | ret = -EINVAL; |
c66ac9db NB |
919 | break; |
920 | } | |
921 | ||
e3d6f909 AG |
922 | if (p_buf) { |
923 | if (p_buf_len < strlen(buf)+1) | |
924 | return -EINVAL; | |
c66ac9db | 925 | strncpy(p_buf, buf, p_buf_len); |
e3d6f909 | 926 | } else { |
6708bb27 | 927 | pr_debug("%s", buf); |
e3d6f909 | 928 | } |
c66ac9db NB |
929 | |
930 | return ret; | |
931 | } | |
932 | ||
933 | int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83) | |
934 | { | |
935 | /* | |
936 | * The VPD identifier type.. | |
937 | * | |
938 | * from spc3r23.pdf Section 7.6.3.1 Table 298 | |
939 | */ | |
940 | vpd->device_identifier_type = (page_83[1] & 0x0f); | |
941 | return transport_dump_vpd_ident_type(vpd, NULL, 0); | |
942 | } | |
943 | EXPORT_SYMBOL(transport_set_vpd_ident_type); | |
944 | ||
945 | int transport_dump_vpd_ident( | |
946 | struct t10_vpd *vpd, | |
947 | unsigned char *p_buf, | |
948 | int p_buf_len) | |
949 | { | |
950 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
951 | int ret = 0; | |
952 | ||
953 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
954 | ||
955 | switch (vpd->device_identifier_code_set) { | |
956 | case 0x01: /* Binary */ | |
703d641d DC |
957 | snprintf(buf, sizeof(buf), |
958 | "T10 VPD Binary Device Identifier: %s\n", | |
c66ac9db NB |
959 | &vpd->device_identifier[0]); |
960 | break; | |
961 | case 0x02: /* ASCII */ | |
703d641d DC |
962 | snprintf(buf, sizeof(buf), |
963 | "T10 VPD ASCII Device Identifier: %s\n", | |
c66ac9db NB |
964 | &vpd->device_identifier[0]); |
965 | break; | |
966 | case 0x03: /* UTF-8 */ | |
703d641d DC |
967 | snprintf(buf, sizeof(buf), |
968 | "T10 VPD UTF-8 Device Identifier: %s\n", | |
c66ac9db NB |
969 | &vpd->device_identifier[0]); |
970 | break; | |
971 | default: | |
972 | sprintf(buf, "T10 VPD Device Identifier encoding unsupported:" | |
973 | " 0x%02x", vpd->device_identifier_code_set); | |
e3d6f909 | 974 | ret = -EINVAL; |
c66ac9db NB |
975 | break; |
976 | } | |
977 | ||
978 | if (p_buf) | |
979 | strncpy(p_buf, buf, p_buf_len); | |
980 | else | |
6708bb27 | 981 | pr_debug("%s", buf); |
c66ac9db NB |
982 | |
983 | return ret; | |
984 | } | |
985 | ||
986 | int | |
987 | transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83) | |
988 | { | |
989 | static const char hex_str[] = "0123456789abcdef"; | |
35d1efe8 | 990 | int j = 0, i = 4; /* offset to start of the identifier */ |
c66ac9db NB |
991 | |
992 | /* | |
993 | * The VPD Code Set (encoding) | |
994 | * | |
995 | * from spc3r23.pdf Section 7.6.3.1 Table 296 | |
996 | */ | |
997 | vpd->device_identifier_code_set = (page_83[0] & 0x0f); | |
998 | switch (vpd->device_identifier_code_set) { | |
999 | case 0x01: /* Binary */ | |
1000 | vpd->device_identifier[j++] = | |
1001 | hex_str[vpd->device_identifier_type]; | |
1002 | while (i < (4 + page_83[3])) { | |
1003 | vpd->device_identifier[j++] = | |
1004 | hex_str[(page_83[i] & 0xf0) >> 4]; | |
1005 | vpd->device_identifier[j++] = | |
1006 | hex_str[page_83[i] & 0x0f]; | |
1007 | i++; | |
1008 | } | |
1009 | break; | |
1010 | case 0x02: /* ASCII */ | |
1011 | case 0x03: /* UTF-8 */ | |
1012 | while (i < (4 + page_83[3])) | |
1013 | vpd->device_identifier[j++] = page_83[i++]; | |
1014 | break; | |
1015 | default: | |
1016 | break; | |
1017 | } | |
1018 | ||
1019 | return transport_dump_vpd_ident(vpd, NULL, 0); | |
1020 | } | |
1021 | EXPORT_SYMBOL(transport_set_vpd_ident); | |
1022 | ||
de103c93 CH |
1023 | sense_reason_t |
1024 | target_cmd_size_check(struct se_cmd *cmd, unsigned int size) | |
9b3b8041 CH |
1025 | { |
1026 | struct se_device *dev = cmd->se_dev; | |
1027 | ||
1028 | if (cmd->unknown_data_length) { | |
1029 | cmd->data_length = size; | |
1030 | } else if (size != cmd->data_length) { | |
1031 | pr_warn("TARGET_CORE[%s]: Expected Transfer Length:" | |
1032 | " %u does not match SCSI CDB Length: %u for SAM Opcode:" | |
1033 | " 0x%02x\n", cmd->se_tfo->get_fabric_name(), | |
1034 | cmd->data_length, size, cmd->t_task_cdb[0]); | |
1035 | ||
9b3b8041 CH |
1036 | if (cmd->data_direction == DMA_TO_DEVICE) { |
1037 | pr_err("Rejecting underflow/overflow" | |
1038 | " WRITE data\n"); | |
de103c93 | 1039 | return TCM_INVALID_CDB_FIELD; |
9b3b8041 CH |
1040 | } |
1041 | /* | |
1042 | * Reject READ_* or WRITE_* with overflow/underflow for | |
1043 | * type SCF_SCSI_DATA_CDB. | |
1044 | */ | |
0fd97ccf | 1045 | if (dev->dev_attrib.block_size != 512) { |
9b3b8041 CH |
1046 | pr_err("Failing OVERFLOW/UNDERFLOW for LBA op" |
1047 | " CDB on non 512-byte sector setup subsystem" | |
1048 | " plugin: %s\n", dev->transport->name); | |
1049 | /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */ | |
de103c93 | 1050 | return TCM_INVALID_CDB_FIELD; |
9b3b8041 | 1051 | } |
4c054ba6 NB |
1052 | /* |
1053 | * For the overflow case keep the existing fabric provided | |
1054 | * ->data_length. Otherwise for the underflow case, reset | |
1055 | * ->data_length to the smaller SCSI expected data transfer | |
1056 | * length. | |
1057 | */ | |
9b3b8041 CH |
1058 | if (size > cmd->data_length) { |
1059 | cmd->se_cmd_flags |= SCF_OVERFLOW_BIT; | |
1060 | cmd->residual_count = (size - cmd->data_length); | |
1061 | } else { | |
1062 | cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT; | |
1063 | cmd->residual_count = (cmd->data_length - size); | |
4c054ba6 | 1064 | cmd->data_length = size; |
9b3b8041 | 1065 | } |
9b3b8041 CH |
1066 | } |
1067 | ||
1068 | return 0; | |
1069 | ||
9b3b8041 CH |
1070 | } |
1071 | ||
c66ac9db NB |
1072 | /* |
1073 | * Used by fabric modules containing a local struct se_cmd within their | |
1074 | * fabric dependent per I/O descriptor. | |
1075 | */ | |
1076 | void transport_init_se_cmd( | |
1077 | struct se_cmd *cmd, | |
1078 | struct target_core_fabric_ops *tfo, | |
1079 | struct se_session *se_sess, | |
1080 | u32 data_length, | |
1081 | int data_direction, | |
1082 | int task_attr, | |
1083 | unsigned char *sense_buffer) | |
1084 | { | |
5951146d AG |
1085 | INIT_LIST_HEAD(&cmd->se_lun_node); |
1086 | INIT_LIST_HEAD(&cmd->se_delayed_node); | |
07bde79a | 1087 | INIT_LIST_HEAD(&cmd->se_qf_node); |
a17f091d | 1088 | INIT_LIST_HEAD(&cmd->se_cmd_list); |
cf572a96 | 1089 | INIT_LIST_HEAD(&cmd->state_list); |
a1d8b49a AG |
1090 | init_completion(&cmd->transport_lun_fe_stop_comp); |
1091 | init_completion(&cmd->transport_lun_stop_comp); | |
1092 | init_completion(&cmd->t_transport_stop_comp); | |
a17f091d | 1093 | init_completion(&cmd->cmd_wait_comp); |
cf572a96 | 1094 | init_completion(&cmd->task_stop_comp); |
a1d8b49a | 1095 | spin_lock_init(&cmd->t_state_lock); |
7d680f3b | 1096 | cmd->transport_state = CMD_T_DEV_ACTIVE; |
c66ac9db NB |
1097 | |
1098 | cmd->se_tfo = tfo; | |
1099 | cmd->se_sess = se_sess; | |
1100 | cmd->data_length = data_length; | |
1101 | cmd->data_direction = data_direction; | |
1102 | cmd->sam_task_attr = task_attr; | |
1103 | cmd->sense_buffer = sense_buffer; | |
cf572a96 CH |
1104 | |
1105 | cmd->state_active = false; | |
c66ac9db NB |
1106 | } |
1107 | EXPORT_SYMBOL(transport_init_se_cmd); | |
1108 | ||
de103c93 CH |
1109 | static sense_reason_t |
1110 | transport_check_alloc_task_attr(struct se_cmd *cmd) | |
c66ac9db | 1111 | { |
019c4ca6 CH |
1112 | struct se_device *dev = cmd->se_dev; |
1113 | ||
c66ac9db NB |
1114 | /* |
1115 | * Check if SAM Task Attribute emulation is enabled for this | |
1116 | * struct se_device storage object | |
1117 | */ | |
019c4ca6 | 1118 | if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) |
c66ac9db NB |
1119 | return 0; |
1120 | ||
e66ecd50 | 1121 | if (cmd->sam_task_attr == MSG_ACA_TAG) { |
6708bb27 | 1122 | pr_debug("SAM Task Attribute ACA" |
c66ac9db | 1123 | " emulation is not supported\n"); |
de103c93 | 1124 | return TCM_INVALID_CDB_FIELD; |
c66ac9db NB |
1125 | } |
1126 | /* | |
1127 | * Used to determine when ORDERED commands should go from | |
1128 | * Dormant to Active status. | |
1129 | */ | |
019c4ca6 | 1130 | cmd->se_ordered_id = atomic_inc_return(&dev->dev_ordered_id); |
c66ac9db | 1131 | smp_mb__after_atomic_inc(); |
6708bb27 | 1132 | pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n", |
c66ac9db | 1133 | cmd->se_ordered_id, cmd->sam_task_attr, |
019c4ca6 | 1134 | dev->transport->name); |
c66ac9db NB |
1135 | return 0; |
1136 | } | |
1137 | ||
de103c93 CH |
1138 | sense_reason_t |
1139 | target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb) | |
c66ac9db | 1140 | { |
0fd97ccf | 1141 | struct se_device *dev = cmd->se_dev; |
de103c93 | 1142 | sense_reason_t ret; |
c66ac9db | 1143 | |
c66ac9db NB |
1144 | /* |
1145 | * Ensure that the received CDB is less than the max (252 + 8) bytes | |
1146 | * for VARIABLE_LENGTH_CMD | |
1147 | */ | |
1148 | if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) { | |
6708bb27 | 1149 | pr_err("Received SCSI CDB with command_size: %d that" |
c66ac9db NB |
1150 | " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n", |
1151 | scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE); | |
de103c93 | 1152 | return TCM_INVALID_CDB_FIELD; |
c66ac9db NB |
1153 | } |
1154 | /* | |
1155 | * If the received CDB is larger than TCM_MAX_COMMAND_SIZE, | |
1156 | * allocate the additional extended CDB buffer now.. Otherwise | |
1157 | * setup the pointer from __t_task_cdb to t_task_cdb. | |
1158 | */ | |
a1d8b49a AG |
1159 | if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) { |
1160 | cmd->t_task_cdb = kzalloc(scsi_command_size(cdb), | |
c66ac9db | 1161 | GFP_KERNEL); |
6708bb27 AG |
1162 | if (!cmd->t_task_cdb) { |
1163 | pr_err("Unable to allocate cmd->t_task_cdb" | |
a1d8b49a | 1164 | " %u > sizeof(cmd->__t_task_cdb): %lu ops\n", |
c66ac9db | 1165 | scsi_command_size(cdb), |
a1d8b49a | 1166 | (unsigned long)sizeof(cmd->__t_task_cdb)); |
de103c93 | 1167 | return TCM_OUT_OF_RESOURCES; |
c66ac9db NB |
1168 | } |
1169 | } else | |
a1d8b49a | 1170 | cmd->t_task_cdb = &cmd->__t_task_cdb[0]; |
c66ac9db | 1171 | /* |
a1d8b49a | 1172 | * Copy the original CDB into cmd-> |
c66ac9db | 1173 | */ |
a1d8b49a | 1174 | memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb)); |
cb4f4d3c | 1175 | |
e5c0d6ad RD |
1176 | trace_target_sequencer_start(cmd); |
1177 | ||
cb4f4d3c CH |
1178 | /* |
1179 | * Check for an existing UNIT ATTENTION condition | |
1180 | */ | |
de103c93 CH |
1181 | ret = target_scsi3_ua_check(cmd); |
1182 | if (ret) | |
1183 | return ret; | |
cb4f4d3c | 1184 | |
c87fbd56 | 1185 | ret = target_alua_state_check(cmd); |
de103c93 CH |
1186 | if (ret) |
1187 | return ret; | |
cb4f4d3c | 1188 | |
d977f437 | 1189 | ret = target_check_reservation(cmd); |
f85eda8d NB |
1190 | if (ret) { |
1191 | cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT; | |
d977f437 | 1192 | return ret; |
f85eda8d | 1193 | } |
cb4f4d3c | 1194 | |
0fd97ccf | 1195 | ret = dev->transport->parse_cdb(cmd); |
de103c93 CH |
1196 | if (ret) |
1197 | return ret; | |
1198 | ||
1199 | ret = transport_check_alloc_task_attr(cmd); | |
1200 | if (ret) | |
c66ac9db | 1201 | return ret; |
cb4f4d3c | 1202 | |
cb4f4d3c | 1203 | cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE; |
cb4f4d3c | 1204 | |
c66ac9db NB |
1205 | spin_lock(&cmd->se_lun->lun_sep_lock); |
1206 | if (cmd->se_lun->lun_sep) | |
1207 | cmd->se_lun->lun_sep->sep_stats.cmd_pdus++; | |
1208 | spin_unlock(&cmd->se_lun->lun_sep_lock); | |
1209 | return 0; | |
1210 | } | |
a12f41f8 | 1211 | EXPORT_SYMBOL(target_setup_cmd_from_cdb); |
c66ac9db | 1212 | |
695434e1 NB |
1213 | /* |
1214 | * Used by fabric module frontends to queue tasks directly. | |
1215 | * Many only be used from process context only | |
1216 | */ | |
1217 | int transport_handle_cdb_direct( | |
1218 | struct se_cmd *cmd) | |
1219 | { | |
de103c93 | 1220 | sense_reason_t ret; |
dd8ae59d | 1221 | |
695434e1 NB |
1222 | if (!cmd->se_lun) { |
1223 | dump_stack(); | |
6708bb27 | 1224 | pr_err("cmd->se_lun is NULL\n"); |
695434e1 NB |
1225 | return -EINVAL; |
1226 | } | |
1227 | if (in_interrupt()) { | |
1228 | dump_stack(); | |
6708bb27 | 1229 | pr_err("transport_generic_handle_cdb cannot be called" |
695434e1 NB |
1230 | " from interrupt context\n"); |
1231 | return -EINVAL; | |
1232 | } | |
dd8ae59d | 1233 | /* |
af877292 CH |
1234 | * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that |
1235 | * outstanding descriptors are handled correctly during shutdown via | |
1236 | * transport_wait_for_tasks() | |
dd8ae59d NB |
1237 | * |
1238 | * Also, we don't take cmd->t_state_lock here as we only expect | |
1239 | * this to be called for initial descriptor submission. | |
1240 | */ | |
1241 | cmd->t_state = TRANSPORT_NEW_CMD; | |
7d680f3b CH |
1242 | cmd->transport_state |= CMD_T_ACTIVE; |
1243 | ||
dd8ae59d NB |
1244 | /* |
1245 | * transport_generic_new_cmd() is already handling QUEUE_FULL, | |
1246 | * so follow TRANSPORT_NEW_CMD processing thread context usage | |
1247 | * and call transport_generic_request_failure() if necessary.. | |
1248 | */ | |
1249 | ret = transport_generic_new_cmd(cmd); | |
de103c93 CH |
1250 | if (ret) |
1251 | transport_generic_request_failure(cmd, ret); | |
dd8ae59d | 1252 | return 0; |
695434e1 NB |
1253 | } |
1254 | EXPORT_SYMBOL(transport_handle_cdb_direct); | |
1255 | ||
de103c93 CH |
1256 | static sense_reason_t |
1257 | transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl, | |
1258 | u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count) | |
1259 | { | |
1260 | if (!sgl || !sgl_count) | |
1261 | return 0; | |
1262 | ||
1263 | /* | |
1264 | * Reject SCSI data overflow with map_mem_to_cmd() as incoming | |
1265 | * scatterlists already have been set to follow what the fabric | |
1266 | * passes for the original expected data transfer length. | |
1267 | */ | |
1268 | if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) { | |
1269 | pr_warn("Rejecting SCSI DATA overflow for fabric using" | |
1270 | " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n"); | |
1271 | return TCM_INVALID_CDB_FIELD; | |
1272 | } | |
1273 | ||
1274 | cmd->t_data_sg = sgl; | |
1275 | cmd->t_data_nents = sgl_count; | |
1276 | ||
1277 | if (sgl_bidi && sgl_bidi_count) { | |
1278 | cmd->t_bidi_data_sg = sgl_bidi; | |
1279 | cmd->t_bidi_data_nents = sgl_bidi_count; | |
1280 | } | |
1281 | cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC; | |
1282 | return 0; | |
1283 | } | |
1284 | ||
a026757f NB |
1285 | /* |
1286 | * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized | |
1287 | * se_cmd + use pre-allocated SGL memory. | |
a6360785 NB |
1288 | * |
1289 | * @se_cmd: command descriptor to submit | |
1290 | * @se_sess: associated se_sess for endpoint | |
1291 | * @cdb: pointer to SCSI CDB | |
1292 | * @sense: pointer to SCSI sense buffer | |
1293 | * @unpacked_lun: unpacked LUN to reference for struct se_lun | |
1294 | * @data_length: fabric expected data transfer length | |
1295 | * @task_addr: SAM task attribute | |
1296 | * @data_dir: DMA data direction | |
1297 | * @flags: flags for command submission from target_sc_flags_tables | |
a026757f NB |
1298 | * @sgl: struct scatterlist memory for unidirectional mapping |
1299 | * @sgl_count: scatterlist count for unidirectional mapping | |
1300 | * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping | |
1301 | * @sgl_bidi_count: scatterlist count for bidirectional READ mapping | |
a6360785 | 1302 | * |
d6dfc868 RD |
1303 | * Returns non zero to signal active I/O shutdown failure. All other |
1304 | * setup exceptions will be returned as a SCSI CHECK_CONDITION response, | |
1305 | * but still return zero here. | |
1306 | * | |
a6360785 NB |
1307 | * This may only be called from process context, and also currently |
1308 | * assumes internal allocation of fabric payload buffer by target-core. | |
a026757f NB |
1309 | */ |
1310 | int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess, | |
a6360785 | 1311 | unsigned char *cdb, unsigned char *sense, u32 unpacked_lun, |
a026757f NB |
1312 | u32 data_length, int task_attr, int data_dir, int flags, |
1313 | struct scatterlist *sgl, u32 sgl_count, | |
1314 | struct scatterlist *sgl_bidi, u32 sgl_bidi_count) | |
a6360785 NB |
1315 | { |
1316 | struct se_portal_group *se_tpg; | |
de103c93 CH |
1317 | sense_reason_t rc; |
1318 | int ret; | |
a6360785 NB |
1319 | |
1320 | se_tpg = se_sess->se_tpg; | |
1321 | BUG_ON(!se_tpg); | |
1322 | BUG_ON(se_cmd->se_tfo || se_cmd->se_sess); | |
1323 | BUG_ON(in_interrupt()); | |
1324 | /* | |
1325 | * Initialize se_cmd for target operation. From this point | |
1326 | * exceptions are handled by sending exception status via | |
1327 | * target_core_fabric_ops->queue_status() callback | |
1328 | */ | |
1329 | transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, | |
1330 | data_length, data_dir, task_attr, sense); | |
b0d79946 SAS |
1331 | if (flags & TARGET_SCF_UNKNOWN_SIZE) |
1332 | se_cmd->unknown_data_length = 1; | |
a6360785 NB |
1333 | /* |
1334 | * Obtain struct se_cmd->cmd_kref reference and add new cmd to | |
1335 | * se_sess->sess_cmd_list. A second kref_get here is necessary | |
1336 | * for fabrics using TARGET_SCF_ACK_KREF that expect a second | |
1337 | * kref_put() to happen during fabric packet acknowledgement. | |
1338 | */ | |
de103c93 CH |
1339 | ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF)); |
1340 | if (ret) | |
1341 | return ret; | |
a6360785 NB |
1342 | /* |
1343 | * Signal bidirectional data payloads to target-core | |
1344 | */ | |
1345 | if (flags & TARGET_SCF_BIDI_OP) | |
1346 | se_cmd->se_cmd_flags |= SCF_BIDI; | |
1347 | /* | |
1348 | * Locate se_lun pointer and attach it to struct se_cmd | |
1349 | */ | |
de103c93 CH |
1350 | rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun); |
1351 | if (rc) { | |
1352 | transport_send_check_condition_and_sense(se_cmd, rc, 0); | |
735703ca | 1353 | target_put_sess_cmd(se_sess, se_cmd); |
d6dfc868 | 1354 | return 0; |
735703ca | 1355 | } |
d6e0175c | 1356 | |
a12f41f8 | 1357 | rc = target_setup_cmd_from_cdb(se_cmd, cdb); |
735703ca | 1358 | if (rc != 0) { |
de103c93 | 1359 | transport_generic_request_failure(se_cmd, rc); |
d6dfc868 | 1360 | return 0; |
735703ca | 1361 | } |
a026757f NB |
1362 | /* |
1363 | * When a non zero sgl_count has been passed perform SGL passthrough | |
1364 | * mapping for pre-allocated fabric memory instead of having target | |
1365 | * core perform an internal SGL allocation.. | |
1366 | */ | |
1367 | if (sgl_count != 0) { | |
1368 | BUG_ON(!sgl); | |
1369 | ||
944981c7 NB |
1370 | /* |
1371 | * A work-around for tcm_loop as some userspace code via | |
1372 | * scsi-generic do not memset their associated read buffers, | |
1373 | * so go ahead and do that here for type non-data CDBs. Also | |
1374 | * note that this is currently guaranteed to be a single SGL | |
1375 | * for this case by target core in target_setup_cmd_from_cdb() | |
1376 | * -> transport_generic_cmd_sequencer(). | |
1377 | */ | |
1378 | if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) && | |
1379 | se_cmd->data_direction == DMA_FROM_DEVICE) { | |
1380 | unsigned char *buf = NULL; | |
1381 | ||
1382 | if (sgl) | |
1383 | buf = kmap(sg_page(sgl)) + sgl->offset; | |
1384 | ||
1385 | if (buf) { | |
1386 | memset(buf, 0, sgl->length); | |
1387 | kunmap(sg_page(sgl)); | |
1388 | } | |
1389 | } | |
1390 | ||
a026757f NB |
1391 | rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count, |
1392 | sgl_bidi, sgl_bidi_count); | |
1393 | if (rc != 0) { | |
de103c93 | 1394 | transport_generic_request_failure(se_cmd, rc); |
a026757f NB |
1395 | return 0; |
1396 | } | |
1397 | } | |
11e319ed AG |
1398 | /* |
1399 | * Check if we need to delay processing because of ALUA | |
1400 | * Active/NonOptimized primary access state.. | |
1401 | */ | |
1402 | core_alua_check_nonop_delay(se_cmd); | |
1403 | ||
a6360785 | 1404 | transport_handle_cdb_direct(se_cmd); |
d6dfc868 | 1405 | return 0; |
a6360785 | 1406 | } |
a026757f NB |
1407 | EXPORT_SYMBOL(target_submit_cmd_map_sgls); |
1408 | ||
1409 | /* | |
1410 | * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd | |
1411 | * | |
1412 | * @se_cmd: command descriptor to submit | |
1413 | * @se_sess: associated se_sess for endpoint | |
1414 | * @cdb: pointer to SCSI CDB | |
1415 | * @sense: pointer to SCSI sense buffer | |
1416 | * @unpacked_lun: unpacked LUN to reference for struct se_lun | |
1417 | * @data_length: fabric expected data transfer length | |
1418 | * @task_addr: SAM task attribute | |
1419 | * @data_dir: DMA data direction | |
1420 | * @flags: flags for command submission from target_sc_flags_tables | |
1421 | * | |
1422 | * Returns non zero to signal active I/O shutdown failure. All other | |
1423 | * setup exceptions will be returned as a SCSI CHECK_CONDITION response, | |
1424 | * but still return zero here. | |
1425 | * | |
1426 | * This may only be called from process context, and also currently | |
1427 | * assumes internal allocation of fabric payload buffer by target-core. | |
1428 | * | |
1429 | * It also assumes interal target core SGL memory allocation. | |
1430 | */ | |
1431 | int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess, | |
1432 | unsigned char *cdb, unsigned char *sense, u32 unpacked_lun, | |
1433 | u32 data_length, int task_attr, int data_dir, int flags) | |
1434 | { | |
1435 | return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense, | |
1436 | unpacked_lun, data_length, task_attr, data_dir, | |
1437 | flags, NULL, 0, NULL, 0); | |
1438 | } | |
a6360785 NB |
1439 | EXPORT_SYMBOL(target_submit_cmd); |
1440 | ||
9f0d05c2 NB |
1441 | static void target_complete_tmr_failure(struct work_struct *work) |
1442 | { | |
1443 | struct se_cmd *se_cmd = container_of(work, struct se_cmd, work); | |
1444 | ||
1445 | se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST; | |
1446 | se_cmd->se_tfo->queue_tm_rsp(se_cmd); | |
5a3b6fc0 RD |
1447 | |
1448 | transport_cmd_check_stop_to_fabric(se_cmd); | |
9f0d05c2 NB |
1449 | } |
1450 | ||
ea98d7f9 AG |
1451 | /** |
1452 | * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd | |
1453 | * for TMR CDBs | |
1454 | * | |
1455 | * @se_cmd: command descriptor to submit | |
1456 | * @se_sess: associated se_sess for endpoint | |
1457 | * @sense: pointer to SCSI sense buffer | |
1458 | * @unpacked_lun: unpacked LUN to reference for struct se_lun | |
1459 | * @fabric_context: fabric context for TMR req | |
1460 | * @tm_type: Type of TM request | |
c0974f89 NB |
1461 | * @gfp: gfp type for caller |
1462 | * @tag: referenced task tag for TMR_ABORT_TASK | |
c7042cae | 1463 | * @flags: submit cmd flags |
ea98d7f9 AG |
1464 | * |
1465 | * Callable from all contexts. | |
1466 | **/ | |
1467 | ||
c7042cae | 1468 | int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess, |
ea98d7f9 | 1469 | unsigned char *sense, u32 unpacked_lun, |
c0974f89 NB |
1470 | void *fabric_tmr_ptr, unsigned char tm_type, |
1471 | gfp_t gfp, unsigned int tag, int flags) | |
ea98d7f9 AG |
1472 | { |
1473 | struct se_portal_group *se_tpg; | |
1474 | int ret; | |
1475 | ||
1476 | se_tpg = se_sess->se_tpg; | |
1477 | BUG_ON(!se_tpg); | |
1478 | ||
1479 | transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, | |
1480 | 0, DMA_NONE, MSG_SIMPLE_TAG, sense); | |
c7042cae NB |
1481 | /* |
1482 | * FIXME: Currently expect caller to handle se_cmd->se_tmr_req | |
1483 | * allocation failure. | |
1484 | */ | |
c0974f89 | 1485 | ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp); |
c7042cae NB |
1486 | if (ret < 0) |
1487 | return -ENOMEM; | |
ea98d7f9 | 1488 | |
c0974f89 NB |
1489 | if (tm_type == TMR_ABORT_TASK) |
1490 | se_cmd->se_tmr_req->ref_task_tag = tag; | |
1491 | ||
ea98d7f9 | 1492 | /* See target_submit_cmd for commentary */ |
bc187ea6 RD |
1493 | ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF)); |
1494 | if (ret) { | |
1495 | core_tmr_release_req(se_cmd->se_tmr_req); | |
1496 | return ret; | |
1497 | } | |
ea98d7f9 | 1498 | |
ea98d7f9 AG |
1499 | ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun); |
1500 | if (ret) { | |
9f0d05c2 NB |
1501 | /* |
1502 | * For callback during failure handling, push this work off | |
1503 | * to process context with TMR_LUN_DOES_NOT_EXIST status. | |
1504 | */ | |
1505 | INIT_WORK(&se_cmd->work, target_complete_tmr_failure); | |
1506 | schedule_work(&se_cmd->work); | |
c7042cae | 1507 | return 0; |
ea98d7f9 AG |
1508 | } |
1509 | transport_generic_handle_tmr(se_cmd); | |
c7042cae | 1510 | return 0; |
ea98d7f9 AG |
1511 | } |
1512 | EXPORT_SYMBOL(target_submit_tmr); | |
1513 | ||
cdbb70bb | 1514 | /* |
cf572a96 | 1515 | * If the cmd is active, request it to be stopped and sleep until it |
cdbb70bb CH |
1516 | * has completed. |
1517 | */ | |
cf572a96 | 1518 | bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags) |
cdbb70bb | 1519 | { |
cdbb70bb CH |
1520 | bool was_active = false; |
1521 | ||
cf572a96 CH |
1522 | if (cmd->transport_state & CMD_T_BUSY) { |
1523 | cmd->transport_state |= CMD_T_REQUEST_STOP; | |
cdbb70bb CH |
1524 | spin_unlock_irqrestore(&cmd->t_state_lock, *flags); |
1525 | ||
cf572a96 CH |
1526 | pr_debug("cmd %p waiting to complete\n", cmd); |
1527 | wait_for_completion(&cmd->task_stop_comp); | |
1528 | pr_debug("cmd %p stopped successfully\n", cmd); | |
cdbb70bb CH |
1529 | |
1530 | spin_lock_irqsave(&cmd->t_state_lock, *flags); | |
cf572a96 CH |
1531 | cmd->transport_state &= ~CMD_T_REQUEST_STOP; |
1532 | cmd->transport_state &= ~CMD_T_BUSY; | |
cdbb70bb CH |
1533 | was_active = true; |
1534 | } | |
1535 | ||
cdbb70bb CH |
1536 | return was_active; |
1537 | } | |
1538 | ||
c66ac9db NB |
1539 | /* |
1540 | * Handle SAM-esque emulation for generic transport request failures. | |
1541 | */ | |
de103c93 CH |
1542 | void transport_generic_request_failure(struct se_cmd *cmd, |
1543 | sense_reason_t sense_reason) | |
c66ac9db | 1544 | { |
07bde79a NB |
1545 | int ret = 0; |
1546 | ||
6708bb27 | 1547 | pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x" |
e3d6f909 | 1548 | " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd), |
a1d8b49a | 1549 | cmd->t_task_cdb[0]); |
de103c93 | 1550 | pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n", |
e3d6f909 | 1551 | cmd->se_tfo->get_cmd_state(cmd), |
de103c93 | 1552 | cmd->t_state, sense_reason); |
d43d6aea | 1553 | pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n", |
7d680f3b CH |
1554 | (cmd->transport_state & CMD_T_ACTIVE) != 0, |
1555 | (cmd->transport_state & CMD_T_STOP) != 0, | |
1556 | (cmd->transport_state & CMD_T_SENT) != 0); | |
c66ac9db | 1557 | |
c66ac9db NB |
1558 | /* |
1559 | * For SAM Task Attribute emulation for failed struct se_cmd | |
1560 | */ | |
019c4ca6 | 1561 | transport_complete_task_attr(cmd); |
c66ac9db | 1562 | |
de103c93 | 1563 | switch (sense_reason) { |
03e98c9e NB |
1564 | case TCM_NON_EXISTENT_LUN: |
1565 | case TCM_UNSUPPORTED_SCSI_OPCODE: | |
1566 | case TCM_INVALID_CDB_FIELD: | |
1567 | case TCM_INVALID_PARAMETER_LIST: | |
bb992e72 | 1568 | case TCM_PARAMETER_LIST_LENGTH_ERROR: |
03e98c9e NB |
1569 | case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE: |
1570 | case TCM_UNKNOWN_MODE_PAGE: | |
1571 | case TCM_WRITE_PROTECTED: | |
e2397c70 | 1572 | case TCM_ADDRESS_OUT_OF_RANGE: |
03e98c9e NB |
1573 | case TCM_CHECK_CONDITION_ABORT_CMD: |
1574 | case TCM_CHECK_CONDITION_UNIT_ATTENTION: | |
1575 | case TCM_CHECK_CONDITION_NOT_READY: | |
c66ac9db | 1576 | break; |
de103c93 CH |
1577 | case TCM_OUT_OF_RESOURCES: |
1578 | sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
1579 | break; | |
03e98c9e | 1580 | case TCM_RESERVATION_CONFLICT: |
c66ac9db NB |
1581 | /* |
1582 | * No SENSE Data payload for this case, set SCSI Status | |
1583 | * and queue the response to $FABRIC_MOD. | |
1584 | * | |
1585 | * Uses linux/include/scsi/scsi.h SAM status codes defs | |
1586 | */ | |
1587 | cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT; | |
1588 | /* | |
1589 | * For UA Interlock Code 11b, a RESERVATION CONFLICT will | |
1590 | * establish a UNIT ATTENTION with PREVIOUS RESERVATION | |
1591 | * CONFLICT STATUS. | |
1592 | * | |
1593 | * See spc4r17, section 7.4.6 Control Mode Page, Table 349 | |
1594 | */ | |
e3d6f909 | 1595 | if (cmd->se_sess && |
0fd97ccf | 1596 | cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2) |
e3d6f909 | 1597 | core_scsi3_ua_allocate(cmd->se_sess->se_node_acl, |
c66ac9db NB |
1598 | cmd->orig_fe_lun, 0x2C, |
1599 | ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS); | |
1600 | ||
e5c0d6ad RD |
1601 | trace_target_cmd_complete(cmd); |
1602 | ret = cmd->se_tfo-> queue_status(cmd); | |
f147abb4 | 1603 | if (ret == -EAGAIN || ret == -ENOMEM) |
07bde79a | 1604 | goto queue_full; |
c66ac9db | 1605 | goto check_stop; |
c66ac9db | 1606 | default: |
6708bb27 | 1607 | pr_err("Unknown transport error for CDB 0x%02x: %d\n", |
de103c93 CH |
1608 | cmd->t_task_cdb[0], sense_reason); |
1609 | sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; | |
c66ac9db NB |
1610 | break; |
1611 | } | |
f3146437 | 1612 | |
de103c93 | 1613 | ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0); |
03e98c9e NB |
1614 | if (ret == -EAGAIN || ret == -ENOMEM) |
1615 | goto queue_full; | |
07bde79a | 1616 | |
c66ac9db NB |
1617 | check_stop: |
1618 | transport_lun_remove_cmd(cmd); | |
6708bb27 | 1619 | if (!transport_cmd_check_stop_to_fabric(cmd)) |
c66ac9db | 1620 | ; |
07bde79a NB |
1621 | return; |
1622 | ||
1623 | queue_full: | |
e057f533 CH |
1624 | cmd->t_state = TRANSPORT_COMPLETE_QF_OK; |
1625 | transport_handle_queue_full(cmd, cmd->se_dev); | |
c66ac9db | 1626 | } |
2fbff127 | 1627 | EXPORT_SYMBOL(transport_generic_request_failure); |
c66ac9db | 1628 | |
76dde50e | 1629 | void __target_execute_cmd(struct se_cmd *cmd) |
c66ac9db | 1630 | { |
de103c93 | 1631 | sense_reason_t ret; |
5f41a31d | 1632 | |
de103c93 CH |
1633 | if (cmd->execute_cmd) { |
1634 | ret = cmd->execute_cmd(cmd); | |
1635 | if (ret) { | |
1636 | spin_lock_irq(&cmd->t_state_lock); | |
1637 | cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT); | |
1638 | spin_unlock_irq(&cmd->t_state_lock); | |
5f41a31d | 1639 | |
de103c93 CH |
1640 | transport_generic_request_failure(cmd, ret); |
1641 | } | |
5f41a31d CH |
1642 | } |
1643 | } | |
1644 | ||
019c4ca6 | 1645 | static bool target_handle_task_attr(struct se_cmd *cmd) |
5f41a31d CH |
1646 | { |
1647 | struct se_device *dev = cmd->se_dev; | |
1648 | ||
019c4ca6 CH |
1649 | if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) |
1650 | return false; | |
5f41a31d | 1651 | |
c66ac9db | 1652 | /* |
25985edc | 1653 | * Check for the existence of HEAD_OF_QUEUE, and if true return 1 |
c66ac9db NB |
1654 | * to allow the passed struct se_cmd list of tasks to the front of the list. |
1655 | */ | |
5f41a31d CH |
1656 | switch (cmd->sam_task_attr) { |
1657 | case MSG_HEAD_TAG: | |
1658 | pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, " | |
1659 | "se_ordered_id: %u\n", | |
1660 | cmd->t_task_cdb[0], cmd->se_ordered_id); | |
019c4ca6 | 1661 | return false; |
5f41a31d CH |
1662 | case MSG_ORDERED_TAG: |
1663 | atomic_inc(&dev->dev_ordered_sync); | |
c66ac9db NB |
1664 | smp_mb__after_atomic_inc(); |
1665 | ||
5f41a31d CH |
1666 | pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, " |
1667 | " se_ordered_id: %u\n", | |
1668 | cmd->t_task_cdb[0], cmd->se_ordered_id); | |
1669 | ||
c66ac9db | 1670 | /* |
5f41a31d CH |
1671 | * Execute an ORDERED command if no other older commands |
1672 | * exist that need to be completed first. | |
c66ac9db | 1673 | */ |
5f41a31d | 1674 | if (!atomic_read(&dev->simple_cmds)) |
019c4ca6 | 1675 | return false; |
5f41a31d CH |
1676 | break; |
1677 | default: | |
c66ac9db NB |
1678 | /* |
1679 | * For SIMPLE and UNTAGGED Task Attribute commands | |
1680 | */ | |
5f41a31d | 1681 | atomic_inc(&dev->simple_cmds); |
c66ac9db | 1682 | smp_mb__after_atomic_inc(); |
5f41a31d | 1683 | break; |
c66ac9db | 1684 | } |
5f41a31d | 1685 | |
019c4ca6 CH |
1686 | if (atomic_read(&dev->dev_ordered_sync) == 0) |
1687 | return false; | |
c66ac9db | 1688 | |
019c4ca6 CH |
1689 | spin_lock(&dev->delayed_cmd_lock); |
1690 | list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list); | |
1691 | spin_unlock(&dev->delayed_cmd_lock); | |
1692 | ||
1693 | pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to" | |
1694 | " delayed CMD list, se_ordered_id: %u\n", | |
1695 | cmd->t_task_cdb[0], cmd->sam_task_attr, | |
1696 | cmd->se_ordered_id); | |
1697 | return true; | |
1698 | } | |
1699 | ||
1700 | void target_execute_cmd(struct se_cmd *cmd) | |
1701 | { | |
1702 | /* | |
1703 | * If the received CDB has aleady been aborted stop processing it here. | |
1704 | */ | |
5bd665f2 LT |
1705 | if (transport_check_aborted_status(cmd, 1)) { |
1706 | complete(&cmd->transport_lun_stop_comp); | |
5f41a31d | 1707 | return; |
c66ac9db | 1708 | } |
c66ac9db | 1709 | |
c66ac9db | 1710 | /* |
019c4ca6 CH |
1711 | * Determine if IOCTL context caller in requesting the stopping of this |
1712 | * command for LUN shutdown purposes. | |
c66ac9db | 1713 | */ |
019c4ca6 CH |
1714 | spin_lock_irq(&cmd->t_state_lock); |
1715 | if (cmd->transport_state & CMD_T_LUN_STOP) { | |
1716 | pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n", | |
1717 | __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd)); | |
1718 | ||
1719 | cmd->transport_state &= ~CMD_T_ACTIVE; | |
1720 | spin_unlock_irq(&cmd->t_state_lock); | |
1721 | complete(&cmd->transport_lun_stop_comp); | |
1722 | return; | |
1723 | } | |
1724 | /* | |
1725 | * Determine if frontend context caller is requesting the stopping of | |
1726 | * this command for frontend exceptions. | |
1727 | */ | |
1728 | if (cmd->transport_state & CMD_T_STOP) { | |
1729 | pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n", | |
1730 | __func__, __LINE__, | |
1731 | cmd->se_tfo->get_task_tag(cmd)); | |
1732 | ||
1733 | spin_unlock_irq(&cmd->t_state_lock); | |
1734 | complete(&cmd->t_transport_stop_comp); | |
1735 | return; | |
1736 | } | |
1737 | ||
1738 | cmd->t_state = TRANSPORT_PROCESSING; | |
1a398b97 | 1739 | cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT; |
019c4ca6 CH |
1740 | spin_unlock_irq(&cmd->t_state_lock); |
1741 | ||
1a398b97 NB |
1742 | if (target_handle_task_attr(cmd)) { |
1743 | spin_lock_irq(&cmd->t_state_lock); | |
1744 | cmd->transport_state &= ~CMD_T_BUSY|CMD_T_SENT; | |
1745 | spin_unlock_irq(&cmd->t_state_lock); | |
1746 | return; | |
1747 | } | |
1748 | ||
1749 | __target_execute_cmd(cmd); | |
c66ac9db | 1750 | } |
70baf0ab | 1751 | EXPORT_SYMBOL(target_execute_cmd); |
c66ac9db | 1752 | |
5f41a31d CH |
1753 | /* |
1754 | * Process all commands up to the last received ORDERED task attribute which | |
1755 | * requires another blocking boundary | |
1756 | */ | |
1757 | static void target_restart_delayed_cmds(struct se_device *dev) | |
1758 | { | |
1759 | for (;;) { | |
1760 | struct se_cmd *cmd; | |
1761 | ||
1762 | spin_lock(&dev->delayed_cmd_lock); | |
1763 | if (list_empty(&dev->delayed_cmd_list)) { | |
1764 | spin_unlock(&dev->delayed_cmd_lock); | |
1765 | break; | |
1766 | } | |
1767 | ||
1768 | cmd = list_entry(dev->delayed_cmd_list.next, | |
1769 | struct se_cmd, se_delayed_node); | |
1770 | list_del(&cmd->se_delayed_node); | |
1771 | spin_unlock(&dev->delayed_cmd_lock); | |
1772 | ||
1773 | __target_execute_cmd(cmd); | |
1774 | ||
1775 | if (cmd->sam_task_attr == MSG_ORDERED_TAG) | |
1776 | break; | |
1777 | } | |
1778 | } | |
1779 | ||
c66ac9db | 1780 | /* |
35e0e757 | 1781 | * Called from I/O completion to determine which dormant/delayed |
c66ac9db NB |
1782 | * and ordered cmds need to have their tasks added to the execution queue. |
1783 | */ | |
1784 | static void transport_complete_task_attr(struct se_cmd *cmd) | |
1785 | { | |
5951146d | 1786 | struct se_device *dev = cmd->se_dev; |
c66ac9db | 1787 | |
019c4ca6 CH |
1788 | if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) |
1789 | return; | |
1790 | ||
e66ecd50 | 1791 | if (cmd->sam_task_attr == MSG_SIMPLE_TAG) { |
c66ac9db NB |
1792 | atomic_dec(&dev->simple_cmds); |
1793 | smp_mb__after_atomic_dec(); | |
1794 | dev->dev_cur_ordered_id++; | |
6708bb27 | 1795 | pr_debug("Incremented dev->dev_cur_ordered_id: %u for" |
c66ac9db NB |
1796 | " SIMPLE: %u\n", dev->dev_cur_ordered_id, |
1797 | cmd->se_ordered_id); | |
e66ecd50 | 1798 | } else if (cmd->sam_task_attr == MSG_HEAD_TAG) { |
c66ac9db | 1799 | dev->dev_cur_ordered_id++; |
6708bb27 | 1800 | pr_debug("Incremented dev_cur_ordered_id: %u for" |
c66ac9db NB |
1801 | " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id, |
1802 | cmd->se_ordered_id); | |
e66ecd50 | 1803 | } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) { |
c66ac9db NB |
1804 | atomic_dec(&dev->dev_ordered_sync); |
1805 | smp_mb__after_atomic_dec(); | |
c66ac9db NB |
1806 | |
1807 | dev->dev_cur_ordered_id++; | |
6708bb27 | 1808 | pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:" |
c66ac9db NB |
1809 | " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id); |
1810 | } | |
c66ac9db | 1811 | |
5f41a31d | 1812 | target_restart_delayed_cmds(dev); |
c66ac9db NB |
1813 | } |
1814 | ||
e057f533 | 1815 | static void transport_complete_qf(struct se_cmd *cmd) |
07bde79a NB |
1816 | { |
1817 | int ret = 0; | |
1818 | ||
019c4ca6 | 1819 | transport_complete_task_attr(cmd); |
e057f533 CH |
1820 | |
1821 | if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) { | |
e5c0d6ad | 1822 | trace_target_cmd_complete(cmd); |
e057f533 CH |
1823 | ret = cmd->se_tfo->queue_status(cmd); |
1824 | if (ret) | |
1825 | goto out; | |
1826 | } | |
07bde79a NB |
1827 | |
1828 | switch (cmd->data_direction) { | |
1829 | case DMA_FROM_DEVICE: | |
e5c0d6ad | 1830 | trace_target_cmd_complete(cmd); |
07bde79a NB |
1831 | ret = cmd->se_tfo->queue_data_in(cmd); |
1832 | break; | |
1833 | case DMA_TO_DEVICE: | |
64577407 | 1834 | if (cmd->se_cmd_flags & SCF_BIDI) { |
07bde79a NB |
1835 | ret = cmd->se_tfo->queue_data_in(cmd); |
1836 | if (ret < 0) | |
e057f533 | 1837 | break; |
07bde79a NB |
1838 | } |
1839 | /* Fall through for DMA_TO_DEVICE */ | |
1840 | case DMA_NONE: | |
e5c0d6ad | 1841 | trace_target_cmd_complete(cmd); |
07bde79a NB |
1842 | ret = cmd->se_tfo->queue_status(cmd); |
1843 | break; | |
1844 | default: | |
1845 | break; | |
1846 | } | |
1847 | ||
e057f533 CH |
1848 | out: |
1849 | if (ret < 0) { | |
1850 | transport_handle_queue_full(cmd, cmd->se_dev); | |
1851 | return; | |
1852 | } | |
1853 | transport_lun_remove_cmd(cmd); | |
1854 | transport_cmd_check_stop_to_fabric(cmd); | |
07bde79a NB |
1855 | } |
1856 | ||
1857 | static void transport_handle_queue_full( | |
1858 | struct se_cmd *cmd, | |
e057f533 | 1859 | struct se_device *dev) |
07bde79a NB |
1860 | { |
1861 | spin_lock_irq(&dev->qf_cmd_lock); | |
07bde79a NB |
1862 | list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list); |
1863 | atomic_inc(&dev->dev_qf_count); | |
1864 | smp_mb__after_atomic_inc(); | |
1865 | spin_unlock_irq(&cmd->se_dev->qf_cmd_lock); | |
1866 | ||
1867 | schedule_work(&cmd->se_dev->qf_work_queue); | |
1868 | } | |
1869 | ||
35e0e757 | 1870 | static void target_complete_ok_work(struct work_struct *work) |
c66ac9db | 1871 | { |
35e0e757 | 1872 | struct se_cmd *cmd = container_of(work, struct se_cmd, work); |
27a27099 | 1873 | int ret; |
35e0e757 | 1874 | |
c66ac9db NB |
1875 | /* |
1876 | * Check if we need to move delayed/dormant tasks from cmds on the | |
1877 | * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task | |
1878 | * Attribute. | |
1879 | */ | |
019c4ca6 CH |
1880 | transport_complete_task_attr(cmd); |
1881 | ||
07bde79a NB |
1882 | /* |
1883 | * Check to schedule QUEUE_FULL work, or execute an existing | |
1884 | * cmd->transport_qf_callback() | |
1885 | */ | |
1886 | if (atomic_read(&cmd->se_dev->dev_qf_count) != 0) | |
1887 | schedule_work(&cmd->se_dev->qf_work_queue); | |
1888 | ||
c66ac9db | 1889 | /* |
d5829eac | 1890 | * Check if we need to send a sense buffer from |
c66ac9db NB |
1891 | * the struct se_cmd in question. |
1892 | */ | |
1893 | if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) { | |
27a27099 | 1894 | WARN_ON(!cmd->scsi_status); |
27a27099 PB |
1895 | ret = transport_send_check_condition_and_sense( |
1896 | cmd, 0, 1); | |
1897 | if (ret == -EAGAIN || ret == -ENOMEM) | |
1898 | goto queue_full; | |
1899 | ||
1900 | transport_lun_remove_cmd(cmd); | |
1901 | transport_cmd_check_stop_to_fabric(cmd); | |
1902 | return; | |
c66ac9db NB |
1903 | } |
1904 | /* | |
25985edc | 1905 | * Check for a callback, used by amongst other things |
a6b0133c | 1906 | * XDWRITE_READ_10 and COMPARE_AND_WRITE emulation. |
c66ac9db | 1907 | */ |
a6b0133c NB |
1908 | if (cmd->transport_complete_callback) { |
1909 | sense_reason_t rc; | |
1910 | ||
1911 | rc = cmd->transport_complete_callback(cmd); | |
1912 | if (!rc) | |
1913 | return; | |
1914 | ||
1915 | ret = transport_send_check_condition_and_sense(cmd, | |
1916 | rc, 0); | |
1917 | if (ret == -EAGAIN || ret == -ENOMEM) | |
1918 | goto queue_full; | |
1919 | ||
1920 | transport_lun_remove_cmd(cmd); | |
1921 | transport_cmd_check_stop_to_fabric(cmd); | |
1922 | return; | |
1923 | } | |
c66ac9db NB |
1924 | |
1925 | switch (cmd->data_direction) { | |
1926 | case DMA_FROM_DEVICE: | |
1927 | spin_lock(&cmd->se_lun->lun_sep_lock); | |
e3d6f909 AG |
1928 | if (cmd->se_lun->lun_sep) { |
1929 | cmd->se_lun->lun_sep->sep_stats.tx_data_octets += | |
c66ac9db NB |
1930 | cmd->data_length; |
1931 | } | |
1932 | spin_unlock(&cmd->se_lun->lun_sep_lock); | |
c66ac9db | 1933 | |
e5c0d6ad | 1934 | trace_target_cmd_complete(cmd); |
07bde79a | 1935 | ret = cmd->se_tfo->queue_data_in(cmd); |
f147abb4 | 1936 | if (ret == -EAGAIN || ret == -ENOMEM) |
07bde79a | 1937 | goto queue_full; |
c66ac9db NB |
1938 | break; |
1939 | case DMA_TO_DEVICE: | |
1940 | spin_lock(&cmd->se_lun->lun_sep_lock); | |
e3d6f909 AG |
1941 | if (cmd->se_lun->lun_sep) { |
1942 | cmd->se_lun->lun_sep->sep_stats.rx_data_octets += | |
c66ac9db NB |
1943 | cmd->data_length; |
1944 | } | |
1945 | spin_unlock(&cmd->se_lun->lun_sep_lock); | |
1946 | /* | |
1947 | * Check if we need to send READ payload for BIDI-COMMAND | |
1948 | */ | |
64577407 | 1949 | if (cmd->se_cmd_flags & SCF_BIDI) { |
c66ac9db | 1950 | spin_lock(&cmd->se_lun->lun_sep_lock); |
e3d6f909 AG |
1951 | if (cmd->se_lun->lun_sep) { |
1952 | cmd->se_lun->lun_sep->sep_stats.tx_data_octets += | |
c66ac9db NB |
1953 | cmd->data_length; |
1954 | } | |
1955 | spin_unlock(&cmd->se_lun->lun_sep_lock); | |
07bde79a | 1956 | ret = cmd->se_tfo->queue_data_in(cmd); |
f147abb4 | 1957 | if (ret == -EAGAIN || ret == -ENOMEM) |
07bde79a | 1958 | goto queue_full; |
c66ac9db NB |
1959 | break; |
1960 | } | |
1961 | /* Fall through for DMA_TO_DEVICE */ | |
1962 | case DMA_NONE: | |
e5c0d6ad | 1963 | trace_target_cmd_complete(cmd); |
07bde79a | 1964 | ret = cmd->se_tfo->queue_status(cmd); |
f147abb4 | 1965 | if (ret == -EAGAIN || ret == -ENOMEM) |
07bde79a | 1966 | goto queue_full; |
c66ac9db NB |
1967 | break; |
1968 | default: | |
1969 | break; | |
1970 | } | |
1971 | ||
1972 | transport_lun_remove_cmd(cmd); | |
1973 | transport_cmd_check_stop_to_fabric(cmd); | |
07bde79a NB |
1974 | return; |
1975 | ||
1976 | queue_full: | |
6708bb27 | 1977 | pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p," |
07bde79a | 1978 | " data_direction: %d\n", cmd, cmd->data_direction); |
e057f533 CH |
1979 | cmd->t_state = TRANSPORT_COMPLETE_QF_OK; |
1980 | transport_handle_queue_full(cmd, cmd->se_dev); | |
c66ac9db NB |
1981 | } |
1982 | ||
6708bb27 | 1983 | static inline void transport_free_sgl(struct scatterlist *sgl, int nents) |
c66ac9db | 1984 | { |
ec98f782 | 1985 | struct scatterlist *sg; |
ec98f782 | 1986 | int count; |
c66ac9db | 1987 | |
6708bb27 AG |
1988 | for_each_sg(sgl, sg, nents, count) |
1989 | __free_page(sg_page(sg)); | |
c66ac9db | 1990 | |
6708bb27 AG |
1991 | kfree(sgl); |
1992 | } | |
c66ac9db | 1993 | |
47e459e6 NB |
1994 | static inline void transport_reset_sgl_orig(struct se_cmd *cmd) |
1995 | { | |
1996 | /* | |
1997 | * Check for saved t_data_sg that may be used for COMPARE_AND_WRITE | |
1998 | * emulation, and free + reset pointers if necessary.. | |
1999 | */ | |
2000 | if (!cmd->t_data_sg_orig) | |
2001 | return; | |
2002 | ||
2003 | kfree(cmd->t_data_sg); | |
2004 | cmd->t_data_sg = cmd->t_data_sg_orig; | |
2005 | cmd->t_data_sg_orig = NULL; | |
2006 | cmd->t_data_nents = cmd->t_data_nents_orig; | |
2007 | cmd->t_data_nents_orig = 0; | |
2008 | } | |
2009 | ||
6708bb27 AG |
2010 | static inline void transport_free_pages(struct se_cmd *cmd) |
2011 | { | |
47e459e6 NB |
2012 | if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) { |
2013 | transport_reset_sgl_orig(cmd); | |
6708bb27 | 2014 | return; |
47e459e6 NB |
2015 | } |
2016 | transport_reset_sgl_orig(cmd); | |
6708bb27 AG |
2017 | |
2018 | transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents); | |
ec98f782 AG |
2019 | cmd->t_data_sg = NULL; |
2020 | cmd->t_data_nents = 0; | |
c66ac9db | 2021 | |
6708bb27 | 2022 | transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents); |
ec98f782 AG |
2023 | cmd->t_bidi_data_sg = NULL; |
2024 | cmd->t_bidi_data_nents = 0; | |
c66ac9db NB |
2025 | } |
2026 | ||
e26d99ae CH |
2027 | /** |
2028 | * transport_release_cmd - free a command | |
2029 | * @cmd: command to free | |
2030 | * | |
2031 | * This routine unconditionally frees a command, and reference counting | |
2032 | * or list removal must be done in the caller. | |
2033 | */ | |
d5ddad41 | 2034 | static int transport_release_cmd(struct se_cmd *cmd) |
e26d99ae CH |
2035 | { |
2036 | BUG_ON(!cmd->se_tfo); | |
2037 | ||
c8e31f26 | 2038 | if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB) |
e26d99ae CH |
2039 | core_tmr_release_req(cmd->se_tmr_req); |
2040 | if (cmd->t_task_cdb != cmd->__t_task_cdb) | |
2041 | kfree(cmd->t_task_cdb); | |
2042 | /* | |
7481deb4 NB |
2043 | * If this cmd has been setup with target_get_sess_cmd(), drop |
2044 | * the kref and call ->release_cmd() in kref callback. | |
e26d99ae | 2045 | */ |
ca24976a | 2046 | return target_put_sess_cmd(cmd->se_sess, cmd); |
e26d99ae CH |
2047 | } |
2048 | ||
d3df7825 CH |
2049 | /** |
2050 | * transport_put_cmd - release a reference to a command | |
2051 | * @cmd: command to release | |
2052 | * | |
2053 | * This routine releases our reference to the command and frees it if possible. | |
2054 | */ | |
d5ddad41 | 2055 | static int transport_put_cmd(struct se_cmd *cmd) |
c66ac9db | 2056 | { |
c66ac9db | 2057 | transport_free_pages(cmd); |
d5ddad41 | 2058 | return transport_release_cmd(cmd); |
c66ac9db | 2059 | } |
c66ac9db | 2060 | |
4949314c | 2061 | void *transport_kmap_data_sg(struct se_cmd *cmd) |
05d1c7c0 | 2062 | { |
ec98f782 | 2063 | struct scatterlist *sg = cmd->t_data_sg; |
4949314c AG |
2064 | struct page **pages; |
2065 | int i; | |
05d1c7c0 AG |
2066 | |
2067 | /* | |
ec98f782 AG |
2068 | * We need to take into account a possible offset here for fabrics like |
2069 | * tcm_loop who may be using a contig buffer from the SCSI midlayer for | |
2070 | * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd() | |
05d1c7c0 | 2071 | */ |
4949314c AG |
2072 | if (!cmd->t_data_nents) |
2073 | return NULL; | |
3717ef0c PB |
2074 | |
2075 | BUG_ON(!sg); | |
2076 | if (cmd->t_data_nents == 1) | |
4949314c AG |
2077 | return kmap(sg_page(sg)) + sg->offset; |
2078 | ||
2079 | /* >1 page. use vmap */ | |
2080 | pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL); | |
de103c93 | 2081 | if (!pages) |
4949314c AG |
2082 | return NULL; |
2083 | ||
2084 | /* convert sg[] to pages[] */ | |
2085 | for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) { | |
2086 | pages[i] = sg_page(sg); | |
2087 | } | |
2088 | ||
2089 | cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL); | |
2090 | kfree(pages); | |
de103c93 | 2091 | if (!cmd->t_data_vmap) |
4949314c AG |
2092 | return NULL; |
2093 | ||
2094 | return cmd->t_data_vmap + cmd->t_data_sg[0].offset; | |
05d1c7c0 | 2095 | } |
4949314c | 2096 | EXPORT_SYMBOL(transport_kmap_data_sg); |
05d1c7c0 | 2097 | |
4949314c | 2098 | void transport_kunmap_data_sg(struct se_cmd *cmd) |
05d1c7c0 | 2099 | { |
a1edf9cf | 2100 | if (!cmd->t_data_nents) { |
4949314c | 2101 | return; |
a1edf9cf | 2102 | } else if (cmd->t_data_nents == 1) { |
4949314c | 2103 | kunmap(sg_page(cmd->t_data_sg)); |
a1edf9cf AG |
2104 | return; |
2105 | } | |
4949314c AG |
2106 | |
2107 | vunmap(cmd->t_data_vmap); | |
2108 | cmd->t_data_vmap = NULL; | |
05d1c7c0 | 2109 | } |
4949314c | 2110 | EXPORT_SYMBOL(transport_kunmap_data_sg); |
05d1c7c0 | 2111 | |
c66ac9db | 2112 | static int |
20093994 NB |
2113 | target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, u32 length, |
2114 | bool zero_page) | |
c66ac9db | 2115 | { |
20093994 | 2116 | struct scatterlist *sg; |
ec98f782 | 2117 | struct page *page; |
20093994 NB |
2118 | gfp_t zero_flag = (zero_page) ? __GFP_ZERO : 0; |
2119 | unsigned int nent; | |
ec98f782 | 2120 | int i = 0; |
c66ac9db | 2121 | |
20093994 NB |
2122 | nent = DIV_ROUND_UP(length, PAGE_SIZE); |
2123 | sg = kmalloc(sizeof(struct scatterlist) * nent, GFP_KERNEL); | |
2124 | if (!sg) | |
ec98f782 | 2125 | return -ENOMEM; |
c66ac9db | 2126 | |
20093994 | 2127 | sg_init_table(sg, nent); |
9db9da33 | 2128 | |
ec98f782 AG |
2129 | while (length) { |
2130 | u32 page_len = min_t(u32, length, PAGE_SIZE); | |
9db9da33 | 2131 | page = alloc_page(GFP_KERNEL | zero_flag); |
ec98f782 AG |
2132 | if (!page) |
2133 | goto out; | |
c66ac9db | 2134 | |
20093994 | 2135 | sg_set_page(&sg[i], page, page_len, 0); |
ec98f782 AG |
2136 | length -= page_len; |
2137 | i++; | |
c66ac9db | 2138 | } |
20093994 NB |
2139 | *sgl = sg; |
2140 | *nents = nent; | |
c66ac9db | 2141 | return 0; |
c66ac9db | 2142 | |
ec98f782 | 2143 | out: |
d0e27c88 | 2144 | while (i > 0) { |
ec98f782 | 2145 | i--; |
20093994 | 2146 | __free_page(sg_page(&sg[i])); |
c66ac9db | 2147 | } |
20093994 | 2148 | kfree(sg); |
ec98f782 | 2149 | return -ENOMEM; |
c66ac9db NB |
2150 | } |
2151 | ||
da0f7619 | 2152 | /* |
b16a35b0 AG |
2153 | * Allocate any required resources to execute the command. For writes we |
2154 | * might not have the payload yet, so notify the fabric via a call to | |
2155 | * ->write_pending instead. Otherwise place it on the execution queue. | |
c66ac9db | 2156 | */ |
de103c93 CH |
2157 | sense_reason_t |
2158 | transport_generic_new_cmd(struct se_cmd *cmd) | |
c66ac9db | 2159 | { |
c66ac9db NB |
2160 | int ret = 0; |
2161 | ||
2162 | /* | |
2163 | * Determine is the TCM fabric module has already allocated physical | |
2164 | * memory, and is directly calling transport_generic_map_mem_to_cmd() | |
ec98f782 | 2165 | * beforehand. |
c66ac9db | 2166 | */ |
ec98f782 AG |
2167 | if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) && |
2168 | cmd->data_length) { | |
20093994 NB |
2169 | bool zero_flag = !(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB); |
2170 | ||
8cefe07b NB |
2171 | if ((cmd->se_cmd_flags & SCF_BIDI) || |
2172 | (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) { | |
2173 | u32 bidi_length; | |
2174 | ||
2175 | if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) | |
2176 | bidi_length = cmd->t_task_nolb * | |
2177 | cmd->se_dev->dev_attrib.block_size; | |
2178 | else | |
2179 | bidi_length = cmd->data_length; | |
2180 | ||
2181 | ret = target_alloc_sgl(&cmd->t_bidi_data_sg, | |
2182 | &cmd->t_bidi_data_nents, | |
2183 | bidi_length, zero_flag); | |
2184 | if (ret < 0) | |
2185 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
2186 | } | |
2187 | ||
20093994 NB |
2188 | ret = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents, |
2189 | cmd->data_length, zero_flag); | |
c66ac9db | 2190 | if (ret < 0) |
de103c93 | 2191 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
c66ac9db | 2192 | } |
c66ac9db | 2193 | /* |
c3196f0c CH |
2194 | * If this command is not a write we can execute it right here, |
2195 | * for write buffers we need to notify the fabric driver first | |
2196 | * and let it call back once the write buffers are ready. | |
c66ac9db | 2197 | */ |
5f41a31d | 2198 | target_add_to_state_list(cmd); |
c3196f0c CH |
2199 | if (cmd->data_direction != DMA_TO_DEVICE) { |
2200 | target_execute_cmd(cmd); | |
2201 | return 0; | |
2202 | } | |
862e6389 | 2203 | transport_cmd_check_stop(cmd, false, true); |
c3196f0c CH |
2204 | |
2205 | ret = cmd->se_tfo->write_pending(cmd); | |
2206 | if (ret == -EAGAIN || ret == -ENOMEM) | |
2207 | goto queue_full; | |
2208 | ||
de103c93 CH |
2209 | /* fabric drivers should only return -EAGAIN or -ENOMEM as error */ |
2210 | WARN_ON(ret); | |
2211 | ||
b69c1fcf | 2212 | return (!ret) ? 0 : TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
da0f7619 | 2213 | |
c3196f0c CH |
2214 | queue_full: |
2215 | pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd); | |
2216 | cmd->t_state = TRANSPORT_COMPLETE_QF_WP; | |
2217 | transport_handle_queue_full(cmd, cmd->se_dev); | |
2218 | return 0; | |
c66ac9db | 2219 | } |
a1d8b49a | 2220 | EXPORT_SYMBOL(transport_generic_new_cmd); |
c66ac9db | 2221 | |
e057f533 | 2222 | static void transport_write_pending_qf(struct se_cmd *cmd) |
07bde79a | 2223 | { |
f147abb4 NB |
2224 | int ret; |
2225 | ||
2226 | ret = cmd->se_tfo->write_pending(cmd); | |
2227 | if (ret == -EAGAIN || ret == -ENOMEM) { | |
e057f533 CH |
2228 | pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", |
2229 | cmd); | |
2230 | transport_handle_queue_full(cmd, cmd->se_dev); | |
2231 | } | |
07bde79a NB |
2232 | } |
2233 | ||
d5ddad41 | 2234 | int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks) |
c66ac9db | 2235 | { |
d5ddad41 NB |
2236 | int ret = 0; |
2237 | ||
d14921d6 | 2238 | if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) { |
c8e31f26 | 2239 | if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) |
d14921d6 NB |
2240 | transport_wait_for_tasks(cmd); |
2241 | ||
d5ddad41 | 2242 | ret = transport_release_cmd(cmd); |
d14921d6 NB |
2243 | } else { |
2244 | if (wait_for_tasks) | |
2245 | transport_wait_for_tasks(cmd); | |
2246 | ||
82f1c8a4 | 2247 | if (cmd->se_lun) |
c66ac9db | 2248 | transport_lun_remove_cmd(cmd); |
c66ac9db | 2249 | |
d5ddad41 | 2250 | ret = transport_put_cmd(cmd); |
c66ac9db | 2251 | } |
d5ddad41 | 2252 | return ret; |
c66ac9db NB |
2253 | } |
2254 | EXPORT_SYMBOL(transport_generic_free_cmd); | |
2255 | ||
a17f091d NB |
2256 | /* target_get_sess_cmd - Add command to active ->sess_cmd_list |
2257 | * @se_sess: session to reference | |
2258 | * @se_cmd: command descriptor to add | |
a6360785 | 2259 | * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd() |
a17f091d | 2260 | */ |
20361e69 | 2261 | int target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd, |
bc187ea6 | 2262 | bool ack_kref) |
a17f091d NB |
2263 | { |
2264 | unsigned long flags; | |
bc187ea6 | 2265 | int ret = 0; |
a17f091d | 2266 | |
7481deb4 | 2267 | kref_init(&se_cmd->cmd_kref); |
a6360785 NB |
2268 | /* |
2269 | * Add a second kref if the fabric caller is expecting to handle | |
2270 | * fabric acknowledgement that requires two target_put_sess_cmd() | |
2271 | * invocations before se_cmd descriptor release. | |
2272 | */ | |
86715569 | 2273 | if (ack_kref == true) { |
a6360785 | 2274 | kref_get(&se_cmd->cmd_kref); |
86715569 NB |
2275 | se_cmd->se_cmd_flags |= SCF_ACK_KREF; |
2276 | } | |
7481deb4 | 2277 | |
a17f091d | 2278 | spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); |
bc187ea6 RD |
2279 | if (se_sess->sess_tearing_down) { |
2280 | ret = -ESHUTDOWN; | |
2281 | goto out; | |
2282 | } | |
a17f091d | 2283 | list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list); |
bc187ea6 | 2284 | out: |
a17f091d | 2285 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); |
bc187ea6 | 2286 | return ret; |
a17f091d | 2287 | } |
20361e69 | 2288 | EXPORT_SYMBOL(target_get_sess_cmd); |
a17f091d | 2289 | |
7481deb4 | 2290 | static void target_release_cmd_kref(struct kref *kref) |
a17f091d | 2291 | { |
7481deb4 NB |
2292 | struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref); |
2293 | struct se_session *se_sess = se_cmd->se_sess; | |
a17f091d | 2294 | |
a17f091d | 2295 | if (list_empty(&se_cmd->se_cmd_list)) { |
ccf5ae83 | 2296 | spin_unlock(&se_sess->sess_cmd_lock); |
ffc32d52 | 2297 | se_cmd->se_tfo->release_cmd(se_cmd); |
7481deb4 | 2298 | return; |
a17f091d | 2299 | } |
a17f091d | 2300 | if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) { |
ccf5ae83 | 2301 | spin_unlock(&se_sess->sess_cmd_lock); |
a17f091d | 2302 | complete(&se_cmd->cmd_wait_comp); |
7481deb4 | 2303 | return; |
a17f091d NB |
2304 | } |
2305 | list_del(&se_cmd->se_cmd_list); | |
ccf5ae83 | 2306 | spin_unlock(&se_sess->sess_cmd_lock); |
a17f091d | 2307 | |
7481deb4 NB |
2308 | se_cmd->se_tfo->release_cmd(se_cmd); |
2309 | } | |
2310 | ||
2311 | /* target_put_sess_cmd - Check for active I/O shutdown via kref_put | |
2312 | * @se_sess: session to reference | |
2313 | * @se_cmd: command descriptor to drop | |
2314 | */ | |
2315 | int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd) | |
2316 | { | |
ccf5ae83 JE |
2317 | return kref_put_spinlock_irqsave(&se_cmd->cmd_kref, target_release_cmd_kref, |
2318 | &se_sess->sess_cmd_lock); | |
a17f091d NB |
2319 | } |
2320 | EXPORT_SYMBOL(target_put_sess_cmd); | |
2321 | ||
1c7b13fe RD |
2322 | /* target_sess_cmd_list_set_waiting - Flag all commands in |
2323 | * sess_cmd_list to complete cmd_wait_comp. Set | |
2324 | * sess_tearing_down so no more commands are queued. | |
2325 | * @se_sess: session to flag | |
a17f091d | 2326 | */ |
1c7b13fe | 2327 | void target_sess_cmd_list_set_waiting(struct se_session *se_sess) |
a17f091d NB |
2328 | { |
2329 | struct se_cmd *se_cmd; | |
2330 | unsigned long flags; | |
2331 | ||
a17f091d | 2332 | spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); |
9b31a328 NB |
2333 | if (se_sess->sess_tearing_down) { |
2334 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); | |
2335 | return; | |
2336 | } | |
1c7b13fe | 2337 | se_sess->sess_tearing_down = 1; |
9b31a328 | 2338 | list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list); |
a17f091d | 2339 | |
9b31a328 | 2340 | list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list) |
a17f091d NB |
2341 | se_cmd->cmd_wait_set = 1; |
2342 | ||
2343 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); | |
2344 | } | |
1c7b13fe | 2345 | EXPORT_SYMBOL(target_sess_cmd_list_set_waiting); |
a17f091d NB |
2346 | |
2347 | /* target_wait_for_sess_cmds - Wait for outstanding descriptors | |
2348 | * @se_sess: session to wait for active I/O | |
a17f091d | 2349 | */ |
be646c2d | 2350 | void target_wait_for_sess_cmds(struct se_session *se_sess) |
a17f091d NB |
2351 | { |
2352 | struct se_cmd *se_cmd, *tmp_cmd; | |
9b31a328 | 2353 | unsigned long flags; |
a17f091d NB |
2354 | |
2355 | list_for_each_entry_safe(se_cmd, tmp_cmd, | |
9b31a328 | 2356 | &se_sess->sess_wait_list, se_cmd_list) { |
a17f091d NB |
2357 | list_del(&se_cmd->se_cmd_list); |
2358 | ||
2359 | pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:" | |
2360 | " %d\n", se_cmd, se_cmd->t_state, | |
2361 | se_cmd->se_tfo->get_cmd_state(se_cmd)); | |
2362 | ||
be646c2d JE |
2363 | wait_for_completion(&se_cmd->cmd_wait_comp); |
2364 | pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d" | |
2365 | " fabric state: %d\n", se_cmd, se_cmd->t_state, | |
2366 | se_cmd->se_tfo->get_cmd_state(se_cmd)); | |
a17f091d NB |
2367 | |
2368 | se_cmd->se_tfo->release_cmd(se_cmd); | |
2369 | } | |
9b31a328 NB |
2370 | |
2371 | spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); | |
2372 | WARN_ON(!list_empty(&se_sess->sess_cmd_list)); | |
2373 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); | |
2374 | ||
a17f091d NB |
2375 | } |
2376 | EXPORT_SYMBOL(target_wait_for_sess_cmds); | |
2377 | ||
c66ac9db NB |
2378 | /* transport_lun_wait_for_tasks(): |
2379 | * | |
2380 | * Called from ConfigFS context to stop the passed struct se_cmd to allow | |
2381 | * an struct se_lun to be successfully shutdown. | |
2382 | */ | |
2383 | static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun) | |
2384 | { | |
2385 | unsigned long flags; | |
cf572a96 CH |
2386 | int ret = 0; |
2387 | ||
c66ac9db NB |
2388 | /* |
2389 | * If the frontend has already requested this struct se_cmd to | |
2390 | * be stopped, we can safely ignore this struct se_cmd. | |
2391 | */ | |
a1d8b49a | 2392 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
7d680f3b CH |
2393 | if (cmd->transport_state & CMD_T_STOP) { |
2394 | cmd->transport_state &= ~CMD_T_LUN_STOP; | |
2395 | ||
2396 | pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n", | |
2397 | cmd->se_tfo->get_task_tag(cmd)); | |
a1d8b49a | 2398 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
862e6389 | 2399 | transport_cmd_check_stop(cmd, false, false); |
e3d6f909 | 2400 | return -EPERM; |
c66ac9db | 2401 | } |
7d680f3b | 2402 | cmd->transport_state |= CMD_T_LUN_FE_STOP; |
a1d8b49a | 2403 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 2404 | |
cf572a96 CH |
2405 | // XXX: audit task_flags checks. |
2406 | spin_lock_irqsave(&cmd->t_state_lock, flags); | |
2407 | if ((cmd->transport_state & CMD_T_BUSY) && | |
2408 | (cmd->transport_state & CMD_T_SENT)) { | |
2409 | if (!target_stop_cmd(cmd, &flags)) | |
2410 | ret++; | |
cf572a96 | 2411 | } |
5f41a31d | 2412 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 2413 | |
785fdf70 CH |
2414 | pr_debug("ConfigFS: cmd: %p stop tasks ret:" |
2415 | " %d\n", cmd, ret); | |
c66ac9db | 2416 | if (!ret) { |
6708bb27 | 2417 | pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n", |
e3d6f909 | 2418 | cmd->se_tfo->get_task_tag(cmd)); |
a1d8b49a | 2419 | wait_for_completion(&cmd->transport_lun_stop_comp); |
6708bb27 | 2420 | pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n", |
e3d6f909 | 2421 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 2422 | } |
c66ac9db NB |
2423 | |
2424 | return 0; | |
2425 | } | |
2426 | ||
c66ac9db NB |
2427 | static void __transport_clear_lun_from_sessions(struct se_lun *lun) |
2428 | { | |
2429 | struct se_cmd *cmd = NULL; | |
2430 | unsigned long lun_flags, cmd_flags; | |
2431 | /* | |
2432 | * Do exception processing and return CHECK_CONDITION status to the | |
2433 | * Initiator Port. | |
2434 | */ | |
2435 | spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags); | |
5951146d AG |
2436 | while (!list_empty(&lun->lun_cmd_list)) { |
2437 | cmd = list_first_entry(&lun->lun_cmd_list, | |
2438 | struct se_cmd, se_lun_node); | |
3d26fea0 | 2439 | list_del_init(&cmd->se_lun_node); |
5951146d | 2440 | |
a1d8b49a | 2441 | spin_lock(&cmd->t_state_lock); |
6708bb27 | 2442 | pr_debug("SE_LUN[%d] - Setting cmd->transport" |
c66ac9db | 2443 | "_lun_stop for ITT: 0x%08x\n", |
e3d6f909 AG |
2444 | cmd->se_lun->unpacked_lun, |
2445 | cmd->se_tfo->get_task_tag(cmd)); | |
7d680f3b | 2446 | cmd->transport_state |= CMD_T_LUN_STOP; |
a1d8b49a | 2447 | spin_unlock(&cmd->t_state_lock); |
c66ac9db NB |
2448 | |
2449 | spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags); | |
2450 | ||
6708bb27 AG |
2451 | if (!cmd->se_lun) { |
2452 | pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n", | |
e3d6f909 AG |
2453 | cmd->se_tfo->get_task_tag(cmd), |
2454 | cmd->se_tfo->get_cmd_state(cmd), cmd->t_state); | |
c66ac9db NB |
2455 | BUG(); |
2456 | } | |
2457 | /* | |
2458 | * If the Storage engine still owns the iscsi_cmd_t, determine | |
2459 | * and/or stop its context. | |
2460 | */ | |
6708bb27 | 2461 | pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport" |
e3d6f909 AG |
2462 | "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun, |
2463 | cmd->se_tfo->get_task_tag(cmd)); | |
c66ac9db | 2464 | |
e3d6f909 | 2465 | if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) { |
c66ac9db NB |
2466 | spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags); |
2467 | continue; | |
2468 | } | |
2469 | ||
6708bb27 | 2470 | pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun" |
c66ac9db | 2471 | "_wait_for_tasks(): SUCCESS\n", |
e3d6f909 AG |
2472 | cmd->se_lun->unpacked_lun, |
2473 | cmd->se_tfo->get_task_tag(cmd)); | |
c66ac9db | 2474 | |
a1d8b49a | 2475 | spin_lock_irqsave(&cmd->t_state_lock, cmd_flags); |
7d680f3b | 2476 | if (!(cmd->transport_state & CMD_T_DEV_ACTIVE)) { |
a1d8b49a | 2477 | spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags); |
c66ac9db NB |
2478 | goto check_cond; |
2479 | } | |
7d680f3b | 2480 | cmd->transport_state &= ~CMD_T_DEV_ACTIVE; |
cf572a96 | 2481 | target_remove_from_state_list(cmd); |
a1d8b49a | 2482 | spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags); |
c66ac9db | 2483 | |
c66ac9db NB |
2484 | /* |
2485 | * The Storage engine stopped this struct se_cmd before it was | |
2486 | * send to the fabric frontend for delivery back to the | |
2487 | * Initiator Node. Return this SCSI CDB back with an | |
2488 | * CHECK_CONDITION status. | |
2489 | */ | |
2490 | check_cond: | |
2491 | transport_send_check_condition_and_sense(cmd, | |
2492 | TCM_NON_EXISTENT_LUN, 0); | |
2493 | /* | |
2494 | * If the fabric frontend is waiting for this iscsi_cmd_t to | |
2495 | * be released, notify the waiting thread now that LU has | |
2496 | * finished accessing it. | |
2497 | */ | |
a1d8b49a | 2498 | spin_lock_irqsave(&cmd->t_state_lock, cmd_flags); |
7d680f3b | 2499 | if (cmd->transport_state & CMD_T_LUN_FE_STOP) { |
6708bb27 | 2500 | pr_debug("SE_LUN[%d] - Detected FE stop for" |
c66ac9db NB |
2501 | " struct se_cmd: %p ITT: 0x%08x\n", |
2502 | lun->unpacked_lun, | |
e3d6f909 | 2503 | cmd, cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 2504 | |
a1d8b49a | 2505 | spin_unlock_irqrestore(&cmd->t_state_lock, |
c66ac9db | 2506 | cmd_flags); |
862e6389 | 2507 | transport_cmd_check_stop(cmd, false, false); |
a1d8b49a | 2508 | complete(&cmd->transport_lun_fe_stop_comp); |
c66ac9db NB |
2509 | spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags); |
2510 | continue; | |
2511 | } | |
6708bb27 | 2512 | pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n", |
e3d6f909 | 2513 | lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 2514 | |
a1d8b49a | 2515 | spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags); |
c66ac9db NB |
2516 | spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags); |
2517 | } | |
2518 | spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags); | |
2519 | } | |
2520 | ||
2521 | static int transport_clear_lun_thread(void *p) | |
2522 | { | |
8359cf43 | 2523 | struct se_lun *lun = p; |
c66ac9db NB |
2524 | |
2525 | __transport_clear_lun_from_sessions(lun); | |
2526 | complete(&lun->lun_shutdown_comp); | |
2527 | ||
2528 | return 0; | |
2529 | } | |
2530 | ||
2531 | int transport_clear_lun_from_sessions(struct se_lun *lun) | |
2532 | { | |
2533 | struct task_struct *kt; | |
2534 | ||
5951146d | 2535 | kt = kthread_run(transport_clear_lun_thread, lun, |
c66ac9db NB |
2536 | "tcm_cl_%u", lun->unpacked_lun); |
2537 | if (IS_ERR(kt)) { | |
6708bb27 | 2538 | pr_err("Unable to start clear_lun thread\n"); |
e3d6f909 | 2539 | return PTR_ERR(kt); |
c66ac9db NB |
2540 | } |
2541 | wait_for_completion(&lun->lun_shutdown_comp); | |
2542 | ||
2543 | return 0; | |
2544 | } | |
2545 | ||
d14921d6 NB |
2546 | /** |
2547 | * transport_wait_for_tasks - wait for completion to occur | |
2548 | * @cmd: command to wait | |
c66ac9db | 2549 | * |
d14921d6 NB |
2550 | * Called from frontend fabric context to wait for storage engine |
2551 | * to pause and/or release frontend generated struct se_cmd. | |
c66ac9db | 2552 | */ |
a17f091d | 2553 | bool transport_wait_for_tasks(struct se_cmd *cmd) |
c66ac9db NB |
2554 | { |
2555 | unsigned long flags; | |
2556 | ||
a1d8b49a | 2557 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c8e31f26 AG |
2558 | if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && |
2559 | !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) { | |
d14921d6 | 2560 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
a17f091d | 2561 | return false; |
d14921d6 | 2562 | } |
cb4f4d3c | 2563 | |
c8e31f26 AG |
2564 | if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) && |
2565 | !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) { | |
d14921d6 | 2566 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
a17f091d | 2567 | return false; |
d14921d6 | 2568 | } |
c66ac9db NB |
2569 | /* |
2570 | * If we are already stopped due to an external event (ie: LUN shutdown) | |
2571 | * sleep until the connection can have the passed struct se_cmd back. | |
a1d8b49a | 2572 | * The cmd->transport_lun_stopped_sem will be upped by |
c66ac9db NB |
2573 | * transport_clear_lun_from_sessions() once the ConfigFS context caller |
2574 | * has completed its operation on the struct se_cmd. | |
2575 | */ | |
7d680f3b | 2576 | if (cmd->transport_state & CMD_T_LUN_STOP) { |
6708bb27 | 2577 | pr_debug("wait_for_tasks: Stopping" |
e3d6f909 | 2578 | " wait_for_completion(&cmd->t_tasktransport_lun_fe" |
c66ac9db | 2579 | "_stop_comp); for ITT: 0x%08x\n", |
e3d6f909 | 2580 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db NB |
2581 | /* |
2582 | * There is a special case for WRITES where a FE exception + | |
2583 | * LUN shutdown means ConfigFS context is still sleeping on | |
2584 | * transport_lun_stop_comp in transport_lun_wait_for_tasks(). | |
2585 | * We go ahead and up transport_lun_stop_comp just to be sure | |
2586 | * here. | |
2587 | */ | |
a1d8b49a AG |
2588 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
2589 | complete(&cmd->transport_lun_stop_comp); | |
2590 | wait_for_completion(&cmd->transport_lun_fe_stop_comp); | |
2591 | spin_lock_irqsave(&cmd->t_state_lock, flags); | |
c66ac9db | 2592 | |
cf572a96 | 2593 | target_remove_from_state_list(cmd); |
c66ac9db NB |
2594 | /* |
2595 | * At this point, the frontend who was the originator of this | |
2596 | * struct se_cmd, now owns the structure and can be released through | |
2597 | * normal means below. | |
2598 | */ | |
6708bb27 | 2599 | pr_debug("wait_for_tasks: Stopped" |
e3d6f909 | 2600 | " wait_for_completion(&cmd->t_tasktransport_lun_fe_" |
c66ac9db | 2601 | "stop_comp); for ITT: 0x%08x\n", |
e3d6f909 | 2602 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 2603 | |
7d680f3b | 2604 | cmd->transport_state &= ~CMD_T_LUN_STOP; |
c66ac9db | 2605 | } |
7d680f3b | 2606 | |
3d28934a | 2607 | if (!(cmd->transport_state & CMD_T_ACTIVE)) { |
d14921d6 | 2608 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
a17f091d | 2609 | return false; |
d14921d6 | 2610 | } |
c66ac9db | 2611 | |
7d680f3b | 2612 | cmd->transport_state |= CMD_T_STOP; |
c66ac9db | 2613 | |
6708bb27 | 2614 | pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x" |
7d680f3b | 2615 | " i_state: %d, t_state: %d, CMD_T_STOP\n", |
f2da9dbd CH |
2616 | cmd, cmd->se_tfo->get_task_tag(cmd), |
2617 | cmd->se_tfo->get_cmd_state(cmd), cmd->t_state); | |
c66ac9db | 2618 | |
a1d8b49a | 2619 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 2620 | |
a1d8b49a | 2621 | wait_for_completion(&cmd->t_transport_stop_comp); |
c66ac9db | 2622 | |
a1d8b49a | 2623 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
7d680f3b | 2624 | cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP); |
c66ac9db | 2625 | |
35d1efe8 | 2626 | pr_debug("wait_for_tasks: Stopped wait_for_completion(" |
a1d8b49a | 2627 | "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n", |
e3d6f909 | 2628 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 2629 | |
d14921d6 | 2630 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
a17f091d NB |
2631 | |
2632 | return true; | |
c66ac9db | 2633 | } |
d14921d6 | 2634 | EXPORT_SYMBOL(transport_wait_for_tasks); |
c66ac9db NB |
2635 | |
2636 | static int transport_get_sense_codes( | |
2637 | struct se_cmd *cmd, | |
2638 | u8 *asc, | |
2639 | u8 *ascq) | |
2640 | { | |
2641 | *asc = cmd->scsi_asc; | |
2642 | *ascq = cmd->scsi_ascq; | |
2643 | ||
2644 | return 0; | |
2645 | } | |
2646 | ||
de103c93 CH |
2647 | int |
2648 | transport_send_check_condition_and_sense(struct se_cmd *cmd, | |
2649 | sense_reason_t reason, int from_transport) | |
c66ac9db NB |
2650 | { |
2651 | unsigned char *buffer = cmd->sense_buffer; | |
2652 | unsigned long flags; | |
c66ac9db NB |
2653 | u8 asc = 0, ascq = 0; |
2654 | ||
a1d8b49a | 2655 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 2656 | if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) { |
a1d8b49a | 2657 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
2658 | return 0; |
2659 | } | |
2660 | cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION; | |
a1d8b49a | 2661 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
2662 | |
2663 | if (!reason && from_transport) | |
2664 | goto after_reason; | |
2665 | ||
2666 | if (!from_transport) | |
2667 | cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE; | |
9c58b7dd | 2668 | |
c66ac9db NB |
2669 | /* |
2670 | * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses | |
2671 | * SENSE KEY values from include/scsi/scsi.h | |
2672 | */ | |
2673 | switch (reason) { | |
ba829137 HR |
2674 | case TCM_NO_SENSE: |
2675 | /* CURRENT ERROR */ | |
2676 | buffer[0] = 0x70; | |
2677 | buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; | |
2678 | /* Not Ready */ | |
2679 | buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY; | |
2680 | /* NO ADDITIONAL SENSE INFORMATION */ | |
2681 | buffer[SPC_ASC_KEY_OFFSET] = 0; | |
2682 | buffer[SPC_ASCQ_KEY_OFFSET] = 0; | |
2683 | break; | |
c66ac9db | 2684 | case TCM_NON_EXISTENT_LUN: |
eb39d340 | 2685 | /* CURRENT ERROR */ |
9c58b7dd RD |
2686 | buffer[0] = 0x70; |
2687 | buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; | |
eb39d340 | 2688 | /* ILLEGAL REQUEST */ |
9c58b7dd | 2689 | buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; |
eb39d340 | 2690 | /* LOGICAL UNIT NOT SUPPORTED */ |
9c58b7dd | 2691 | buffer[SPC_ASC_KEY_OFFSET] = 0x25; |
eb39d340 | 2692 | break; |
c66ac9db NB |
2693 | case TCM_UNSUPPORTED_SCSI_OPCODE: |
2694 | case TCM_SECTOR_COUNT_TOO_MANY: | |
2695 | /* CURRENT ERROR */ | |
9c58b7dd RD |
2696 | buffer[0] = 0x70; |
2697 | buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; | |
c66ac9db | 2698 | /* ILLEGAL REQUEST */ |
9c58b7dd | 2699 | buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; |
c66ac9db | 2700 | /* INVALID COMMAND OPERATION CODE */ |
9c58b7dd | 2701 | buffer[SPC_ASC_KEY_OFFSET] = 0x20; |
c66ac9db NB |
2702 | break; |
2703 | case TCM_UNKNOWN_MODE_PAGE: | |
2704 | /* CURRENT ERROR */ | |
9c58b7dd RD |
2705 | buffer[0] = 0x70; |
2706 | buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; | |
c66ac9db | 2707 | /* ILLEGAL REQUEST */ |
9c58b7dd | 2708 | buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; |
c66ac9db | 2709 | /* INVALID FIELD IN CDB */ |
9c58b7dd | 2710 | buffer[SPC_ASC_KEY_OFFSET] = 0x24; |
c66ac9db NB |
2711 | break; |
2712 | case TCM_CHECK_CONDITION_ABORT_CMD: | |
2713 | /* CURRENT ERROR */ | |
9c58b7dd RD |
2714 | buffer[0] = 0x70; |
2715 | buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; | |
c66ac9db | 2716 | /* ABORTED COMMAND */ |
9c58b7dd | 2717 | buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; |
c66ac9db | 2718 | /* BUS DEVICE RESET FUNCTION OCCURRED */ |
9c58b7dd RD |
2719 | buffer[SPC_ASC_KEY_OFFSET] = 0x29; |
2720 | buffer[SPC_ASCQ_KEY_OFFSET] = 0x03; | |
c66ac9db NB |
2721 | break; |
2722 | case TCM_INCORRECT_AMOUNT_OF_DATA: | |
2723 | /* CURRENT ERROR */ | |
9c58b7dd RD |
2724 | buffer[0] = 0x70; |
2725 | buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; | |
c66ac9db | 2726 | /* ABORTED COMMAND */ |
9c58b7dd | 2727 | buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; |
c66ac9db | 2728 | /* WRITE ERROR */ |
9c58b7dd | 2729 | buffer[SPC_ASC_KEY_OFFSET] = 0x0c; |
c66ac9db | 2730 | /* NOT ENOUGH UNSOLICITED DATA */ |
9c58b7dd | 2731 | buffer[SPC_ASCQ_KEY_OFFSET] = 0x0d; |
c66ac9db NB |
2732 | break; |
2733 | case TCM_INVALID_CDB_FIELD: | |
2734 | /* CURRENT ERROR */ | |
9c58b7dd RD |
2735 | buffer[0] = 0x70; |
2736 | buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; | |
9fbc8909 | 2737 | /* ILLEGAL REQUEST */ |
9c58b7dd | 2738 | buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; |
c66ac9db | 2739 | /* INVALID FIELD IN CDB */ |
9c58b7dd | 2740 | buffer[SPC_ASC_KEY_OFFSET] = 0x24; |
c66ac9db NB |
2741 | break; |
2742 | case TCM_INVALID_PARAMETER_LIST: | |
2743 | /* CURRENT ERROR */ | |
9c58b7dd RD |
2744 | buffer[0] = 0x70; |
2745 | buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; | |
9fbc8909 | 2746 | /* ILLEGAL REQUEST */ |
9c58b7dd | 2747 | buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; |
c66ac9db | 2748 | /* INVALID FIELD IN PARAMETER LIST */ |
9c58b7dd | 2749 | buffer[SPC_ASC_KEY_OFFSET] = 0x26; |
c66ac9db | 2750 | break; |
bb992e72 RD |
2751 | case TCM_PARAMETER_LIST_LENGTH_ERROR: |
2752 | /* CURRENT ERROR */ | |
2753 | buffer[0] = 0x70; | |
2754 | buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; | |
2755 | /* ILLEGAL REQUEST */ | |
2756 | buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; | |
2757 | /* PARAMETER LIST LENGTH ERROR */ | |
2758 | buffer[SPC_ASC_KEY_OFFSET] = 0x1a; | |
2759 | break; | |
c66ac9db NB |
2760 | case TCM_UNEXPECTED_UNSOLICITED_DATA: |
2761 | /* CURRENT ERROR */ | |
9c58b7dd RD |
2762 | buffer[0] = 0x70; |
2763 | buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; | |
c66ac9db | 2764 | /* ABORTED COMMAND */ |
9c58b7dd | 2765 | buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; |
c66ac9db | 2766 | /* WRITE ERROR */ |
9c58b7dd | 2767 | buffer[SPC_ASC_KEY_OFFSET] = 0x0c; |
c66ac9db | 2768 | /* UNEXPECTED_UNSOLICITED_DATA */ |
9c58b7dd | 2769 | buffer[SPC_ASCQ_KEY_OFFSET] = 0x0c; |
c66ac9db NB |
2770 | break; |
2771 | case TCM_SERVICE_CRC_ERROR: | |
2772 | /* CURRENT ERROR */ | |
9c58b7dd RD |
2773 | buffer[0] = 0x70; |
2774 | buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; | |
c66ac9db | 2775 | /* ABORTED COMMAND */ |
9c58b7dd | 2776 | buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; |
c66ac9db | 2777 | /* PROTOCOL SERVICE CRC ERROR */ |
9c58b7dd | 2778 | buffer[SPC_ASC_KEY_OFFSET] = 0x47; |
c66ac9db | 2779 | /* N/A */ |
9c58b7dd | 2780 | buffer[SPC_ASCQ_KEY_OFFSET] = 0x05; |
c66ac9db NB |
2781 | break; |
2782 | case TCM_SNACK_REJECTED: | |
2783 | /* CURRENT ERROR */ | |
9c58b7dd RD |
2784 | buffer[0] = 0x70; |
2785 | buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; | |
c66ac9db | 2786 | /* ABORTED COMMAND */ |
9c58b7dd | 2787 | buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; |
c66ac9db | 2788 | /* READ ERROR */ |
9c58b7dd | 2789 | buffer[SPC_ASC_KEY_OFFSET] = 0x11; |
c66ac9db | 2790 | /* FAILED RETRANSMISSION REQUEST */ |
9c58b7dd | 2791 | buffer[SPC_ASCQ_KEY_OFFSET] = 0x13; |
c66ac9db NB |
2792 | break; |
2793 | case TCM_WRITE_PROTECTED: | |
2794 | /* CURRENT ERROR */ | |
9c58b7dd RD |
2795 | buffer[0] = 0x70; |
2796 | buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; | |
c66ac9db | 2797 | /* DATA PROTECT */ |
9c58b7dd | 2798 | buffer[SPC_SENSE_KEY_OFFSET] = DATA_PROTECT; |
c66ac9db | 2799 | /* WRITE PROTECTED */ |
9c58b7dd | 2800 | buffer[SPC_ASC_KEY_OFFSET] = 0x27; |
c66ac9db | 2801 | break; |
e2397c70 RD |
2802 | case TCM_ADDRESS_OUT_OF_RANGE: |
2803 | /* CURRENT ERROR */ | |
9c58b7dd RD |
2804 | buffer[0] = 0x70; |
2805 | buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; | |
e2397c70 | 2806 | /* ILLEGAL REQUEST */ |
9c58b7dd | 2807 | buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; |
e2397c70 | 2808 | /* LOGICAL BLOCK ADDRESS OUT OF RANGE */ |
9c58b7dd | 2809 | buffer[SPC_ASC_KEY_OFFSET] = 0x21; |
e2397c70 | 2810 | break; |
c66ac9db NB |
2811 | case TCM_CHECK_CONDITION_UNIT_ATTENTION: |
2812 | /* CURRENT ERROR */ | |
9c58b7dd RD |
2813 | buffer[0] = 0x70; |
2814 | buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; | |
c66ac9db | 2815 | /* UNIT ATTENTION */ |
9c58b7dd | 2816 | buffer[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION; |
c66ac9db | 2817 | core_scsi3_ua_for_check_condition(cmd, &asc, &ascq); |
9c58b7dd RD |
2818 | buffer[SPC_ASC_KEY_OFFSET] = asc; |
2819 | buffer[SPC_ASCQ_KEY_OFFSET] = ascq; | |
c66ac9db NB |
2820 | break; |
2821 | case TCM_CHECK_CONDITION_NOT_READY: | |
2822 | /* CURRENT ERROR */ | |
9c58b7dd RD |
2823 | buffer[0] = 0x70; |
2824 | buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; | |
c66ac9db | 2825 | /* Not Ready */ |
9c58b7dd | 2826 | buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY; |
c66ac9db | 2827 | transport_get_sense_codes(cmd, &asc, &ascq); |
9c58b7dd RD |
2828 | buffer[SPC_ASC_KEY_OFFSET] = asc; |
2829 | buffer[SPC_ASCQ_KEY_OFFSET] = ascq; | |
c66ac9db | 2830 | break; |
818b571c NB |
2831 | case TCM_MISCOMPARE_VERIFY: |
2832 | /* CURRENT ERROR */ | |
2833 | buffer[0] = 0x70; | |
2834 | buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; | |
2835 | buffer[SPC_SENSE_KEY_OFFSET] = MISCOMPARE; | |
2836 | /* MISCOMPARE DURING VERIFY OPERATION */ | |
2837 | buffer[SPC_ASC_KEY_OFFSET] = 0x1d; | |
2838 | buffer[SPC_ASCQ_KEY_OFFSET] = 0x00; | |
2839 | break; | |
c66ac9db NB |
2840 | case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE: |
2841 | default: | |
2842 | /* CURRENT ERROR */ | |
9c58b7dd RD |
2843 | buffer[0] = 0x70; |
2844 | buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; | |
ad673282 JE |
2845 | /* |
2846 | * Returning ILLEGAL REQUEST would cause immediate IO errors on | |
2847 | * Solaris initiators. Returning NOT READY instead means the | |
2848 | * operations will be retried a finite number of times and we | |
2849 | * can survive intermittent errors. | |
2850 | */ | |
2851 | buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY; | |
c66ac9db | 2852 | /* LOGICAL UNIT COMMUNICATION FAILURE */ |
18a9df42 | 2853 | buffer[SPC_ASC_KEY_OFFSET] = 0x08; |
c66ac9db NB |
2854 | break; |
2855 | } | |
2856 | /* | |
2857 | * This code uses linux/include/scsi/scsi.h SAM status codes! | |
2858 | */ | |
2859 | cmd->scsi_status = SAM_STAT_CHECK_CONDITION; | |
2860 | /* | |
2861 | * Automatically padded, this value is encoded in the fabric's | |
2862 | * data_length response PDU containing the SCSI defined sense data. | |
2863 | */ | |
9c58b7dd | 2864 | cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER; |
c66ac9db NB |
2865 | |
2866 | after_reason: | |
e5c0d6ad | 2867 | trace_target_cmd_complete(cmd); |
07bde79a | 2868 | return cmd->se_tfo->queue_status(cmd); |
c66ac9db NB |
2869 | } |
2870 | EXPORT_SYMBOL(transport_send_check_condition_and_sense); | |
2871 | ||
2872 | int transport_check_aborted_status(struct se_cmd *cmd, int send_status) | |
2873 | { | |
c18bc7d8 RD |
2874 | if (!(cmd->transport_state & CMD_T_ABORTED)) |
2875 | return 0; | |
c66ac9db | 2876 | |
c18bc7d8 RD |
2877 | if (!send_status || (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS)) |
2878 | return 1; | |
8b1e1244 | 2879 | |
c18bc7d8 RD |
2880 | pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB: 0x%02x ITT: 0x%08x\n", |
2881 | cmd->t_task_cdb[0], cmd->se_tfo->get_task_tag(cmd)); | |
8b1e1244 | 2882 | |
c18bc7d8 | 2883 | cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS; |
e5c0d6ad | 2884 | trace_target_cmd_complete(cmd); |
c18bc7d8 RD |
2885 | cmd->se_tfo->queue_status(cmd); |
2886 | ||
2887 | return 1; | |
c66ac9db NB |
2888 | } |
2889 | EXPORT_SYMBOL(transport_check_aborted_status); | |
2890 | ||
2891 | void transport_send_task_abort(struct se_cmd *cmd) | |
2892 | { | |
c252f003 NB |
2893 | unsigned long flags; |
2894 | ||
2895 | spin_lock_irqsave(&cmd->t_state_lock, flags); | |
3ea160b3 | 2896 | if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION | SCF_SENT_DELAYED_TAS)) { |
c252f003 NB |
2897 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
2898 | return; | |
2899 | } | |
2900 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
2901 | ||
c66ac9db NB |
2902 | /* |
2903 | * If there are still expected incoming fabric WRITEs, we wait | |
2904 | * until until they have completed before sending a TASK_ABORTED | |
2905 | * response. This response with TASK_ABORTED status will be | |
2906 | * queued back to fabric module by transport_check_aborted_status(). | |
2907 | */ | |
2908 | if (cmd->data_direction == DMA_TO_DEVICE) { | |
e3d6f909 | 2909 | if (cmd->se_tfo->write_pending_status(cmd) != 0) { |
7d680f3b | 2910 | cmd->transport_state |= CMD_T_ABORTED; |
c66ac9db | 2911 | smp_mb__after_atomic_inc(); |
c66ac9db NB |
2912 | } |
2913 | } | |
2914 | cmd->scsi_status = SAM_STAT_TASK_ABORTED; | |
8b1e1244 | 2915 | |
72b59d6e RD |
2916 | transport_lun_remove_cmd(cmd); |
2917 | ||
6708bb27 | 2918 | pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x," |
a1d8b49a | 2919 | " ITT: 0x%08x\n", cmd->t_task_cdb[0], |
e3d6f909 | 2920 | cmd->se_tfo->get_task_tag(cmd)); |
8b1e1244 | 2921 | |
e5c0d6ad | 2922 | trace_target_cmd_complete(cmd); |
e3d6f909 | 2923 | cmd->se_tfo->queue_status(cmd); |
c66ac9db NB |
2924 | } |
2925 | ||
af877292 | 2926 | static void target_tmr_work(struct work_struct *work) |
c66ac9db | 2927 | { |
af877292 | 2928 | struct se_cmd *cmd = container_of(work, struct se_cmd, work); |
5951146d | 2929 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
2930 | struct se_tmr_req *tmr = cmd->se_tmr_req; |
2931 | int ret; | |
2932 | ||
2933 | switch (tmr->function) { | |
5c6cd613 | 2934 | case TMR_ABORT_TASK: |
3d28934a | 2935 | core_tmr_abort_task(dev, tmr, cmd->se_sess); |
c66ac9db | 2936 | break; |
5c6cd613 NB |
2937 | case TMR_ABORT_TASK_SET: |
2938 | case TMR_CLEAR_ACA: | |
2939 | case TMR_CLEAR_TASK_SET: | |
c66ac9db NB |
2940 | tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED; |
2941 | break; | |
5c6cd613 | 2942 | case TMR_LUN_RESET: |
c66ac9db NB |
2943 | ret = core_tmr_lun_reset(dev, tmr, NULL, NULL); |
2944 | tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE : | |
2945 | TMR_FUNCTION_REJECTED; | |
2946 | break; | |
5c6cd613 | 2947 | case TMR_TARGET_WARM_RESET: |
c66ac9db NB |
2948 | tmr->response = TMR_FUNCTION_REJECTED; |
2949 | break; | |
5c6cd613 | 2950 | case TMR_TARGET_COLD_RESET: |
c66ac9db NB |
2951 | tmr->response = TMR_FUNCTION_REJECTED; |
2952 | break; | |
c66ac9db | 2953 | default: |
6708bb27 | 2954 | pr_err("Uknown TMR function: 0x%02x.\n", |
c66ac9db NB |
2955 | tmr->function); |
2956 | tmr->response = TMR_FUNCTION_REJECTED; | |
2957 | break; | |
2958 | } | |
2959 | ||
2960 | cmd->t_state = TRANSPORT_ISTATE_PROCESSING; | |
e3d6f909 | 2961 | cmd->se_tfo->queue_tm_rsp(cmd); |
c66ac9db | 2962 | |
b7b8bef7 | 2963 | transport_cmd_check_stop_to_fabric(cmd); |
c66ac9db NB |
2964 | } |
2965 | ||
af877292 CH |
2966 | int transport_generic_handle_tmr( |
2967 | struct se_cmd *cmd) | |
c66ac9db | 2968 | { |
af877292 CH |
2969 | INIT_WORK(&cmd->work, target_tmr_work); |
2970 | queue_work(cmd->se_dev->tmr_wq, &cmd->work); | |
c66ac9db NB |
2971 | return 0; |
2972 | } | |
af877292 | 2973 | EXPORT_SYMBOL(transport_generic_handle_tmr); |