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c66ac9db NB |
1 | /******************************************************************************* |
2 | * Filename: target_core_transport.c | |
3 | * | |
4 | * This file contains the Generic Target Engine Core. | |
5 | * | |
6 | * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc. | |
7 | * Copyright (c) 2005, 2006, 2007 SBE, Inc. | |
8 | * Copyright (c) 2007-2010 Rising Tide Systems | |
9 | * Copyright (c) 2008-2010 Linux-iSCSI.org | |
10 | * | |
11 | * Nicholas A. Bellinger <nab@kernel.org> | |
12 | * | |
13 | * This program is free software; you can redistribute it and/or modify | |
14 | * it under the terms of the GNU General Public License as published by | |
15 | * the Free Software Foundation; either version 2 of the License, or | |
16 | * (at your option) any later version. | |
17 | * | |
18 | * This program is distributed in the hope that it will be useful, | |
19 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
21 | * GNU General Public License for more details. | |
22 | * | |
23 | * You should have received a copy of the GNU General Public License | |
24 | * along with this program; if not, write to the Free Software | |
25 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
26 | * | |
27 | ******************************************************************************/ | |
28 | ||
c66ac9db NB |
29 | #include <linux/net.h> |
30 | #include <linux/delay.h> | |
31 | #include <linux/string.h> | |
32 | #include <linux/timer.h> | |
33 | #include <linux/slab.h> | |
34 | #include <linux/blkdev.h> | |
35 | #include <linux/spinlock.h> | |
c66ac9db NB |
36 | #include <linux/kthread.h> |
37 | #include <linux/in.h> | |
38 | #include <linux/cdrom.h> | |
827509e3 | 39 | #include <linux/module.h> |
015487b8 | 40 | #include <linux/ratelimit.h> |
c66ac9db NB |
41 | #include <asm/unaligned.h> |
42 | #include <net/sock.h> | |
43 | #include <net/tcp.h> | |
44 | #include <scsi/scsi.h> | |
45 | #include <scsi/scsi_cmnd.h> | |
e66ecd50 | 46 | #include <scsi/scsi_tcq.h> |
c66ac9db NB |
47 | |
48 | #include <target/target_core_base.h> | |
c4795fb2 CH |
49 | #include <target/target_core_backend.h> |
50 | #include <target/target_core_fabric.h> | |
c66ac9db NB |
51 | #include <target/target_core_configfs.h> |
52 | ||
e26d99ae | 53 | #include "target_core_internal.h" |
c66ac9db | 54 | #include "target_core_alua.h" |
c66ac9db | 55 | #include "target_core_pr.h" |
c66ac9db NB |
56 | #include "target_core_ua.h" |
57 | ||
e3d6f909 | 58 | static int sub_api_initialized; |
c66ac9db | 59 | |
35e0e757 | 60 | static struct workqueue_struct *target_completion_wq; |
c66ac9db | 61 | static struct kmem_cache *se_sess_cache; |
c66ac9db | 62 | struct kmem_cache *se_ua_cache; |
c66ac9db NB |
63 | struct kmem_cache *t10_pr_reg_cache; |
64 | struct kmem_cache *t10_alua_lu_gp_cache; | |
65 | struct kmem_cache *t10_alua_lu_gp_mem_cache; | |
66 | struct kmem_cache *t10_alua_tg_pt_gp_cache; | |
67 | struct kmem_cache *t10_alua_tg_pt_gp_mem_cache; | |
68 | ||
5951146d | 69 | static int transport_processing_thread(void *param); |
c66ac9db | 70 | static void transport_complete_task_attr(struct se_cmd *cmd); |
07bde79a | 71 | static void transport_handle_queue_full(struct se_cmd *cmd, |
e057f533 | 72 | struct se_device *dev); |
05d1c7c0 | 73 | static int transport_generic_get_mem(struct se_cmd *cmd); |
39c05f32 | 74 | static void transport_put_cmd(struct se_cmd *cmd); |
3df8d40b | 75 | static void transport_remove_cmd_from_queue(struct se_cmd *cmd); |
c66ac9db | 76 | static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq); |
35e0e757 | 77 | static void target_complete_ok_work(struct work_struct *work); |
c66ac9db | 78 | |
e3d6f909 | 79 | int init_se_kmem_caches(void) |
c66ac9db | 80 | { |
c66ac9db NB |
81 | se_sess_cache = kmem_cache_create("se_sess_cache", |
82 | sizeof(struct se_session), __alignof__(struct se_session), | |
83 | 0, NULL); | |
6708bb27 AG |
84 | if (!se_sess_cache) { |
85 | pr_err("kmem_cache_create() for struct se_session" | |
c66ac9db | 86 | " failed\n"); |
c8e31f26 | 87 | goto out; |
c66ac9db NB |
88 | } |
89 | se_ua_cache = kmem_cache_create("se_ua_cache", | |
90 | sizeof(struct se_ua), __alignof__(struct se_ua), | |
91 | 0, NULL); | |
6708bb27 AG |
92 | if (!se_ua_cache) { |
93 | pr_err("kmem_cache_create() for struct se_ua failed\n"); | |
35e0e757 | 94 | goto out_free_sess_cache; |
c66ac9db | 95 | } |
c66ac9db NB |
96 | t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache", |
97 | sizeof(struct t10_pr_registration), | |
98 | __alignof__(struct t10_pr_registration), 0, NULL); | |
6708bb27 AG |
99 | if (!t10_pr_reg_cache) { |
100 | pr_err("kmem_cache_create() for struct t10_pr_registration" | |
c66ac9db | 101 | " failed\n"); |
35e0e757 | 102 | goto out_free_ua_cache; |
c66ac9db NB |
103 | } |
104 | t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache", | |
105 | sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp), | |
106 | 0, NULL); | |
6708bb27 AG |
107 | if (!t10_alua_lu_gp_cache) { |
108 | pr_err("kmem_cache_create() for t10_alua_lu_gp_cache" | |
c66ac9db | 109 | " failed\n"); |
35e0e757 | 110 | goto out_free_pr_reg_cache; |
c66ac9db NB |
111 | } |
112 | t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache", | |
113 | sizeof(struct t10_alua_lu_gp_member), | |
114 | __alignof__(struct t10_alua_lu_gp_member), 0, NULL); | |
6708bb27 AG |
115 | if (!t10_alua_lu_gp_mem_cache) { |
116 | pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_" | |
c66ac9db | 117 | "cache failed\n"); |
35e0e757 | 118 | goto out_free_lu_gp_cache; |
c66ac9db NB |
119 | } |
120 | t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache", | |
121 | sizeof(struct t10_alua_tg_pt_gp), | |
122 | __alignof__(struct t10_alua_tg_pt_gp), 0, NULL); | |
6708bb27 AG |
123 | if (!t10_alua_tg_pt_gp_cache) { |
124 | pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_" | |
c66ac9db | 125 | "cache failed\n"); |
35e0e757 | 126 | goto out_free_lu_gp_mem_cache; |
c66ac9db NB |
127 | } |
128 | t10_alua_tg_pt_gp_mem_cache = kmem_cache_create( | |
129 | "t10_alua_tg_pt_gp_mem_cache", | |
130 | sizeof(struct t10_alua_tg_pt_gp_member), | |
131 | __alignof__(struct t10_alua_tg_pt_gp_member), | |
132 | 0, NULL); | |
6708bb27 AG |
133 | if (!t10_alua_tg_pt_gp_mem_cache) { |
134 | pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_" | |
c66ac9db | 135 | "mem_t failed\n"); |
35e0e757 | 136 | goto out_free_tg_pt_gp_cache; |
c66ac9db NB |
137 | } |
138 | ||
35e0e757 CH |
139 | target_completion_wq = alloc_workqueue("target_completion", |
140 | WQ_MEM_RECLAIM, 0); | |
141 | if (!target_completion_wq) | |
142 | goto out_free_tg_pt_gp_mem_cache; | |
143 | ||
c66ac9db | 144 | return 0; |
35e0e757 CH |
145 | |
146 | out_free_tg_pt_gp_mem_cache: | |
147 | kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache); | |
148 | out_free_tg_pt_gp_cache: | |
149 | kmem_cache_destroy(t10_alua_tg_pt_gp_cache); | |
150 | out_free_lu_gp_mem_cache: | |
151 | kmem_cache_destroy(t10_alua_lu_gp_mem_cache); | |
152 | out_free_lu_gp_cache: | |
153 | kmem_cache_destroy(t10_alua_lu_gp_cache); | |
154 | out_free_pr_reg_cache: | |
155 | kmem_cache_destroy(t10_pr_reg_cache); | |
156 | out_free_ua_cache: | |
157 | kmem_cache_destroy(se_ua_cache); | |
158 | out_free_sess_cache: | |
159 | kmem_cache_destroy(se_sess_cache); | |
c66ac9db | 160 | out: |
e3d6f909 | 161 | return -ENOMEM; |
c66ac9db NB |
162 | } |
163 | ||
e3d6f909 | 164 | void release_se_kmem_caches(void) |
c66ac9db | 165 | { |
35e0e757 | 166 | destroy_workqueue(target_completion_wq); |
c66ac9db NB |
167 | kmem_cache_destroy(se_sess_cache); |
168 | kmem_cache_destroy(se_ua_cache); | |
c66ac9db NB |
169 | kmem_cache_destroy(t10_pr_reg_cache); |
170 | kmem_cache_destroy(t10_alua_lu_gp_cache); | |
171 | kmem_cache_destroy(t10_alua_lu_gp_mem_cache); | |
172 | kmem_cache_destroy(t10_alua_tg_pt_gp_cache); | |
173 | kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache); | |
c66ac9db NB |
174 | } |
175 | ||
e3d6f909 AG |
176 | /* This code ensures unique mib indexes are handed out. */ |
177 | static DEFINE_SPINLOCK(scsi_mib_index_lock); | |
178 | static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX]; | |
e89d15ee NB |
179 | |
180 | /* | |
181 | * Allocate a new row index for the entry type specified | |
182 | */ | |
183 | u32 scsi_get_new_index(scsi_index_t type) | |
184 | { | |
185 | u32 new_index; | |
186 | ||
e3d6f909 | 187 | BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX)); |
e89d15ee | 188 | |
e3d6f909 AG |
189 | spin_lock(&scsi_mib_index_lock); |
190 | new_index = ++scsi_mib_index[type]; | |
191 | spin_unlock(&scsi_mib_index_lock); | |
e89d15ee NB |
192 | |
193 | return new_index; | |
194 | } | |
195 | ||
e26d99ae | 196 | static void transport_init_queue_obj(struct se_queue_obj *qobj) |
c66ac9db NB |
197 | { |
198 | atomic_set(&qobj->queue_cnt, 0); | |
199 | INIT_LIST_HEAD(&qobj->qobj_list); | |
200 | init_waitqueue_head(&qobj->thread_wq); | |
201 | spin_lock_init(&qobj->cmd_queue_lock); | |
202 | } | |
c66ac9db | 203 | |
dbc5623e | 204 | void transport_subsystem_check_init(void) |
c66ac9db NB |
205 | { |
206 | int ret; | |
207 | ||
dbc5623e NB |
208 | if (sub_api_initialized) |
209 | return; | |
210 | ||
c66ac9db NB |
211 | ret = request_module("target_core_iblock"); |
212 | if (ret != 0) | |
6708bb27 | 213 | pr_err("Unable to load target_core_iblock\n"); |
c66ac9db NB |
214 | |
215 | ret = request_module("target_core_file"); | |
216 | if (ret != 0) | |
6708bb27 | 217 | pr_err("Unable to load target_core_file\n"); |
c66ac9db NB |
218 | |
219 | ret = request_module("target_core_pscsi"); | |
220 | if (ret != 0) | |
6708bb27 | 221 | pr_err("Unable to load target_core_pscsi\n"); |
c66ac9db NB |
222 | |
223 | ret = request_module("target_core_stgt"); | |
224 | if (ret != 0) | |
6708bb27 | 225 | pr_err("Unable to load target_core_stgt\n"); |
c66ac9db | 226 | |
e3d6f909 | 227 | sub_api_initialized = 1; |
dbc5623e | 228 | return; |
c66ac9db NB |
229 | } |
230 | ||
231 | struct se_session *transport_init_session(void) | |
232 | { | |
233 | struct se_session *se_sess; | |
234 | ||
235 | se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL); | |
6708bb27 AG |
236 | if (!se_sess) { |
237 | pr_err("Unable to allocate struct se_session from" | |
c66ac9db NB |
238 | " se_sess_cache\n"); |
239 | return ERR_PTR(-ENOMEM); | |
240 | } | |
241 | INIT_LIST_HEAD(&se_sess->sess_list); | |
242 | INIT_LIST_HEAD(&se_sess->sess_acl_list); | |
a17f091d NB |
243 | INIT_LIST_HEAD(&se_sess->sess_cmd_list); |
244 | INIT_LIST_HEAD(&se_sess->sess_wait_list); | |
245 | spin_lock_init(&se_sess->sess_cmd_lock); | |
41ac82b6 | 246 | kref_init(&se_sess->sess_kref); |
c66ac9db NB |
247 | |
248 | return se_sess; | |
249 | } | |
250 | EXPORT_SYMBOL(transport_init_session); | |
251 | ||
252 | /* | |
140854cb | 253 | * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called. |
c66ac9db NB |
254 | */ |
255 | void __transport_register_session( | |
256 | struct se_portal_group *se_tpg, | |
257 | struct se_node_acl *se_nacl, | |
258 | struct se_session *se_sess, | |
259 | void *fabric_sess_ptr) | |
260 | { | |
261 | unsigned char buf[PR_REG_ISID_LEN]; | |
262 | ||
263 | se_sess->se_tpg = se_tpg; | |
264 | se_sess->fabric_sess_ptr = fabric_sess_ptr; | |
265 | /* | |
266 | * Used by struct se_node_acl's under ConfigFS to locate active se_session-t | |
267 | * | |
268 | * Only set for struct se_session's that will actually be moving I/O. | |
269 | * eg: *NOT* discovery sessions. | |
270 | */ | |
271 | if (se_nacl) { | |
272 | /* | |
273 | * If the fabric module supports an ISID based TransportID, | |
274 | * save this value in binary from the fabric I_T Nexus now. | |
275 | */ | |
e3d6f909 | 276 | if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { |
c66ac9db | 277 | memset(&buf[0], 0, PR_REG_ISID_LEN); |
e3d6f909 | 278 | se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, |
c66ac9db NB |
279 | &buf[0], PR_REG_ISID_LEN); |
280 | se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]); | |
281 | } | |
afb999ff NB |
282 | kref_get(&se_nacl->acl_kref); |
283 | ||
c66ac9db NB |
284 | spin_lock_irq(&se_nacl->nacl_sess_lock); |
285 | /* | |
286 | * The se_nacl->nacl_sess pointer will be set to the | |
287 | * last active I_T Nexus for each struct se_node_acl. | |
288 | */ | |
289 | se_nacl->nacl_sess = se_sess; | |
290 | ||
291 | list_add_tail(&se_sess->sess_acl_list, | |
292 | &se_nacl->acl_sess_list); | |
293 | spin_unlock_irq(&se_nacl->nacl_sess_lock); | |
294 | } | |
295 | list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list); | |
296 | ||
6708bb27 | 297 | pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n", |
e3d6f909 | 298 | se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr); |
c66ac9db NB |
299 | } |
300 | EXPORT_SYMBOL(__transport_register_session); | |
301 | ||
302 | void transport_register_session( | |
303 | struct se_portal_group *se_tpg, | |
304 | struct se_node_acl *se_nacl, | |
305 | struct se_session *se_sess, | |
306 | void *fabric_sess_ptr) | |
307 | { | |
140854cb NB |
308 | unsigned long flags; |
309 | ||
310 | spin_lock_irqsave(&se_tpg->session_lock, flags); | |
c66ac9db | 311 | __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr); |
140854cb | 312 | spin_unlock_irqrestore(&se_tpg->session_lock, flags); |
c66ac9db NB |
313 | } |
314 | EXPORT_SYMBOL(transport_register_session); | |
315 | ||
4149268e | 316 | void target_release_session(struct kref *kref) |
41ac82b6 NB |
317 | { |
318 | struct se_session *se_sess = container_of(kref, | |
319 | struct se_session, sess_kref); | |
320 | struct se_portal_group *se_tpg = se_sess->se_tpg; | |
321 | ||
322 | se_tpg->se_tpg_tfo->close_session(se_sess); | |
323 | } | |
324 | ||
325 | void target_get_session(struct se_session *se_sess) | |
326 | { | |
327 | kref_get(&se_sess->sess_kref); | |
328 | } | |
329 | EXPORT_SYMBOL(target_get_session); | |
330 | ||
33933a0e | 331 | void target_put_session(struct se_session *se_sess) |
41ac82b6 | 332 | { |
4149268e JE |
333 | struct se_portal_group *tpg = se_sess->se_tpg; |
334 | ||
335 | if (tpg->se_tpg_tfo->put_session != NULL) { | |
336 | tpg->se_tpg_tfo->put_session(se_sess); | |
337 | return; | |
338 | } | |
33933a0e | 339 | kref_put(&se_sess->sess_kref, target_release_session); |
41ac82b6 NB |
340 | } |
341 | EXPORT_SYMBOL(target_put_session); | |
342 | ||
afb999ff NB |
343 | static void target_complete_nacl(struct kref *kref) |
344 | { | |
345 | struct se_node_acl *nacl = container_of(kref, | |
346 | struct se_node_acl, acl_kref); | |
347 | ||
348 | complete(&nacl->acl_free_comp); | |
349 | } | |
350 | ||
351 | void target_put_nacl(struct se_node_acl *nacl) | |
352 | { | |
353 | kref_put(&nacl->acl_kref, target_complete_nacl); | |
354 | } | |
355 | ||
c66ac9db NB |
356 | void transport_deregister_session_configfs(struct se_session *se_sess) |
357 | { | |
358 | struct se_node_acl *se_nacl; | |
23388864 | 359 | unsigned long flags; |
c66ac9db NB |
360 | /* |
361 | * Used by struct se_node_acl's under ConfigFS to locate active struct se_session | |
362 | */ | |
363 | se_nacl = se_sess->se_node_acl; | |
6708bb27 | 364 | if (se_nacl) { |
23388864 | 365 | spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags); |
337c0607 NB |
366 | if (se_nacl->acl_stop == 0) |
367 | list_del(&se_sess->sess_acl_list); | |
c66ac9db NB |
368 | /* |
369 | * If the session list is empty, then clear the pointer. | |
370 | * Otherwise, set the struct se_session pointer from the tail | |
371 | * element of the per struct se_node_acl active session list. | |
372 | */ | |
373 | if (list_empty(&se_nacl->acl_sess_list)) | |
374 | se_nacl->nacl_sess = NULL; | |
375 | else { | |
376 | se_nacl->nacl_sess = container_of( | |
377 | se_nacl->acl_sess_list.prev, | |
378 | struct se_session, sess_acl_list); | |
379 | } | |
23388864 | 380 | spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags); |
c66ac9db NB |
381 | } |
382 | } | |
383 | EXPORT_SYMBOL(transport_deregister_session_configfs); | |
384 | ||
385 | void transport_free_session(struct se_session *se_sess) | |
386 | { | |
387 | kmem_cache_free(se_sess_cache, se_sess); | |
388 | } | |
389 | EXPORT_SYMBOL(transport_free_session); | |
390 | ||
391 | void transport_deregister_session(struct se_session *se_sess) | |
392 | { | |
393 | struct se_portal_group *se_tpg = se_sess->se_tpg; | |
01468346 | 394 | struct target_core_fabric_ops *se_tfo; |
c66ac9db | 395 | struct se_node_acl *se_nacl; |
e63a8e19 | 396 | unsigned long flags; |
01468346 | 397 | bool comp_nacl = true; |
c66ac9db | 398 | |
6708bb27 | 399 | if (!se_tpg) { |
c66ac9db NB |
400 | transport_free_session(se_sess); |
401 | return; | |
402 | } | |
01468346 | 403 | se_tfo = se_tpg->se_tpg_tfo; |
c66ac9db | 404 | |
e63a8e19 | 405 | spin_lock_irqsave(&se_tpg->session_lock, flags); |
c66ac9db NB |
406 | list_del(&se_sess->sess_list); |
407 | se_sess->se_tpg = NULL; | |
408 | se_sess->fabric_sess_ptr = NULL; | |
e63a8e19 | 409 | spin_unlock_irqrestore(&se_tpg->session_lock, flags); |
c66ac9db NB |
410 | |
411 | /* | |
412 | * Determine if we need to do extra work for this initiator node's | |
413 | * struct se_node_acl if it had been previously dynamically generated. | |
414 | */ | |
415 | se_nacl = se_sess->se_node_acl; | |
01468346 NB |
416 | |
417 | spin_lock_irqsave(&se_tpg->acl_node_lock, flags); | |
418 | if (se_nacl && se_nacl->dynamic_node_acl) { | |
419 | if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) { | |
420 | list_del(&se_nacl->acl_list); | |
421 | se_tpg->num_node_acls--; | |
422 | spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags); | |
423 | core_tpg_wait_for_nacl_pr_ref(se_nacl); | |
424 | core_free_device_list_for_node(se_nacl, se_tpg); | |
425 | se_tfo->tpg_release_fabric_acl(se_tpg, se_nacl); | |
426 | ||
427 | comp_nacl = false; | |
428 | spin_lock_irqsave(&se_tpg->acl_node_lock, flags); | |
c66ac9db | 429 | } |
c66ac9db | 430 | } |
01468346 | 431 | spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags); |
c66ac9db | 432 | |
6708bb27 | 433 | pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n", |
e3d6f909 | 434 | se_tpg->se_tpg_tfo->get_fabric_name()); |
01468346 | 435 | /* |
afb999ff NB |
436 | * If last kref is dropping now for an explict NodeACL, awake sleeping |
437 | * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group | |
438 | * removal context. | |
01468346 NB |
439 | */ |
440 | if (se_nacl && comp_nacl == true) | |
afb999ff | 441 | target_put_nacl(se_nacl); |
01468346 | 442 | |
afb999ff | 443 | transport_free_session(se_sess); |
c66ac9db NB |
444 | } |
445 | EXPORT_SYMBOL(transport_deregister_session); | |
446 | ||
447 | /* | |
a1d8b49a | 448 | * Called with cmd->t_state_lock held. |
c66ac9db | 449 | */ |
cf572a96 | 450 | static void target_remove_from_state_list(struct se_cmd *cmd) |
c66ac9db | 451 | { |
42bf829e | 452 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
453 | unsigned long flags; |
454 | ||
42bf829e CH |
455 | if (!dev) |
456 | return; | |
c66ac9db | 457 | |
cf572a96 CH |
458 | if (cmd->transport_state & CMD_T_BUSY) |
459 | return; | |
c66ac9db | 460 | |
cf572a96 CH |
461 | spin_lock_irqsave(&dev->execute_task_lock, flags); |
462 | if (cmd->state_active) { | |
463 | list_del(&cmd->state_list); | |
cf572a96 | 464 | cmd->state_active = false; |
c66ac9db | 465 | } |
cf572a96 | 466 | spin_unlock_irqrestore(&dev->execute_task_lock, flags); |
c66ac9db NB |
467 | } |
468 | ||
f7113a47 | 469 | static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists) |
c66ac9db NB |
470 | { |
471 | unsigned long flags; | |
472 | ||
a1d8b49a | 473 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db NB |
474 | /* |
475 | * Determine if IOCTL context caller in requesting the stopping of this | |
476 | * command for LUN shutdown purposes. | |
477 | */ | |
7d680f3b CH |
478 | if (cmd->transport_state & CMD_T_LUN_STOP) { |
479 | pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n", | |
480 | __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd)); | |
c66ac9db | 481 | |
7d680f3b | 482 | cmd->transport_state &= ~CMD_T_ACTIVE; |
f7113a47 | 483 | if (remove_from_lists) |
cf572a96 | 484 | target_remove_from_state_list(cmd); |
a1d8b49a | 485 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 486 | |
a1d8b49a | 487 | complete(&cmd->transport_lun_stop_comp); |
c66ac9db NB |
488 | return 1; |
489 | } | |
f7113a47 CH |
490 | |
491 | if (remove_from_lists) { | |
492 | target_remove_from_state_list(cmd); | |
493 | ||
494 | /* | |
495 | * Clear struct se_cmd->se_lun before the handoff to FE. | |
496 | */ | |
497 | cmd->se_lun = NULL; | |
498 | } | |
499 | ||
c66ac9db NB |
500 | /* |
501 | * Determine if frontend context caller is requesting the stopping of | |
e3d6f909 | 502 | * this command for frontend exceptions. |
c66ac9db | 503 | */ |
7d680f3b CH |
504 | if (cmd->transport_state & CMD_T_STOP) { |
505 | pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n", | |
506 | __func__, __LINE__, | |
e3d6f909 | 507 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 508 | |
a1d8b49a | 509 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 510 | |
a1d8b49a | 511 | complete(&cmd->t_transport_stop_comp); |
c66ac9db NB |
512 | return 1; |
513 | } | |
f7113a47 CH |
514 | |
515 | cmd->transport_state &= ~CMD_T_ACTIVE; | |
516 | if (remove_from_lists) { | |
517 | /* | |
518 | * Some fabric modules like tcm_loop can release | |
519 | * their internally allocated I/O reference now and | |
520 | * struct se_cmd now. | |
521 | * | |
522 | * Fabric modules are expected to return '1' here if the | |
523 | * se_cmd being passed is released at this point, | |
524 | * or zero if not being released. | |
525 | */ | |
526 | if (cmd->se_tfo->check_stop_free != NULL) { | |
527 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
528 | return cmd->se_tfo->check_stop_free(cmd); | |
c66ac9db | 529 | } |
f7113a47 | 530 | } |
c66ac9db | 531 | |
a1d8b49a | 532 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
533 | return 0; |
534 | } | |
535 | ||
536 | static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd) | |
537 | { | |
f7113a47 | 538 | return transport_cmd_check_stop(cmd, true); |
c66ac9db NB |
539 | } |
540 | ||
541 | static void transport_lun_remove_cmd(struct se_cmd *cmd) | |
542 | { | |
e3d6f909 | 543 | struct se_lun *lun = cmd->se_lun; |
c66ac9db NB |
544 | unsigned long flags; |
545 | ||
546 | if (!lun) | |
547 | return; | |
548 | ||
a1d8b49a | 549 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
7d680f3b CH |
550 | if (cmd->transport_state & CMD_T_DEV_ACTIVE) { |
551 | cmd->transport_state &= ~CMD_T_DEV_ACTIVE; | |
cf572a96 | 552 | target_remove_from_state_list(cmd); |
c66ac9db | 553 | } |
a1d8b49a | 554 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 555 | |
c66ac9db | 556 | spin_lock_irqsave(&lun->lun_cmd_lock, flags); |
3d26fea0 CH |
557 | if (!list_empty(&cmd->se_lun_node)) |
558 | list_del_init(&cmd->se_lun_node); | |
c66ac9db NB |
559 | spin_unlock_irqrestore(&lun->lun_cmd_lock, flags); |
560 | } | |
561 | ||
562 | void transport_cmd_finish_abort(struct se_cmd *cmd, int remove) | |
563 | { | |
c8e31f26 | 564 | if (!(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) |
8dc52b54 | 565 | transport_lun_remove_cmd(cmd); |
c66ac9db NB |
566 | |
567 | if (transport_cmd_check_stop_to_fabric(cmd)) | |
568 | return; | |
77039d1e | 569 | if (remove) { |
3df8d40b | 570 | transport_remove_cmd_from_queue(cmd); |
e6a2573f | 571 | transport_put_cmd(cmd); |
77039d1e | 572 | } |
c66ac9db NB |
573 | } |
574 | ||
f7a5cc0b CH |
575 | static void transport_add_cmd_to_queue(struct se_cmd *cmd, int t_state, |
576 | bool at_head) | |
c66ac9db NB |
577 | { |
578 | struct se_device *dev = cmd->se_dev; | |
e3d6f909 | 579 | struct se_queue_obj *qobj = &dev->dev_queue_obj; |
c66ac9db NB |
580 | unsigned long flags; |
581 | ||
c66ac9db | 582 | if (t_state) { |
a1d8b49a | 583 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 584 | cmd->t_state = t_state; |
7d680f3b | 585 | cmd->transport_state |= CMD_T_ACTIVE; |
a1d8b49a | 586 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
587 | } |
588 | ||
589 | spin_lock_irqsave(&qobj->cmd_queue_lock, flags); | |
79a7fef2 RD |
590 | |
591 | /* If the cmd is already on the list, remove it before we add it */ | |
592 | if (!list_empty(&cmd->se_queue_node)) | |
593 | list_del(&cmd->se_queue_node); | |
594 | else | |
595 | atomic_inc(&qobj->queue_cnt); | |
596 | ||
f7a5cc0b | 597 | if (at_head) |
07bde79a | 598 | list_add(&cmd->se_queue_node, &qobj->qobj_list); |
f7a5cc0b | 599 | else |
07bde79a | 600 | list_add_tail(&cmd->se_queue_node, &qobj->qobj_list); |
7d680f3b | 601 | cmd->transport_state |= CMD_T_QUEUED; |
c66ac9db NB |
602 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); |
603 | ||
c66ac9db | 604 | wake_up_interruptible(&qobj->thread_wq); |
c66ac9db NB |
605 | } |
606 | ||
5951146d AG |
607 | static struct se_cmd * |
608 | transport_get_cmd_from_queue(struct se_queue_obj *qobj) | |
c66ac9db | 609 | { |
5951146d | 610 | struct se_cmd *cmd; |
c66ac9db NB |
611 | unsigned long flags; |
612 | ||
613 | spin_lock_irqsave(&qobj->cmd_queue_lock, flags); | |
614 | if (list_empty(&qobj->qobj_list)) { | |
615 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); | |
616 | return NULL; | |
617 | } | |
5951146d | 618 | cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node); |
c66ac9db | 619 | |
7d680f3b | 620 | cmd->transport_state &= ~CMD_T_QUEUED; |
79a7fef2 | 621 | list_del_init(&cmd->se_queue_node); |
c66ac9db NB |
622 | atomic_dec(&qobj->queue_cnt); |
623 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); | |
624 | ||
5951146d | 625 | return cmd; |
c66ac9db NB |
626 | } |
627 | ||
3df8d40b | 628 | static void transport_remove_cmd_from_queue(struct se_cmd *cmd) |
c66ac9db | 629 | { |
3df8d40b | 630 | struct se_queue_obj *qobj = &cmd->se_dev->dev_queue_obj; |
c66ac9db NB |
631 | unsigned long flags; |
632 | ||
633 | spin_lock_irqsave(&qobj->cmd_queue_lock, flags); | |
7d680f3b | 634 | if (!(cmd->transport_state & CMD_T_QUEUED)) { |
c66ac9db NB |
635 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); |
636 | return; | |
637 | } | |
7d680f3b | 638 | cmd->transport_state &= ~CMD_T_QUEUED; |
79a7fef2 RD |
639 | atomic_dec(&qobj->queue_cnt); |
640 | list_del_init(&cmd->se_queue_node); | |
c66ac9db | 641 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); |
c66ac9db NB |
642 | } |
643 | ||
35e0e757 CH |
644 | static void target_complete_failure_work(struct work_struct *work) |
645 | { | |
646 | struct se_cmd *cmd = container_of(work, struct se_cmd, work); | |
647 | ||
03e98c9e | 648 | transport_generic_request_failure(cmd); |
35e0e757 CH |
649 | } |
650 | ||
5787cacd | 651 | void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status) |
c66ac9db | 652 | { |
42bf829e | 653 | struct se_device *dev = cmd->se_dev; |
5787cacd | 654 | int success = scsi_status == GOOD; |
c66ac9db | 655 | unsigned long flags; |
c66ac9db | 656 | |
5787cacd CH |
657 | cmd->scsi_status = scsi_status; |
658 | ||
659 | ||
a1d8b49a | 660 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
cf572a96 | 661 | cmd->transport_state &= ~CMD_T_BUSY; |
c66ac9db | 662 | |
c66ac9db | 663 | if (dev && dev->transport->transport_complete) { |
5787cacd CH |
664 | if (dev->transport->transport_complete(cmd, |
665 | cmd->t_data_sg) != 0) { | |
c66ac9db | 666 | cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE; |
c66ac9db NB |
667 | success = 1; |
668 | } | |
669 | } | |
670 | ||
671 | /* | |
5787cacd | 672 | * See if we are waiting to complete for an exception condition. |
c66ac9db | 673 | */ |
cf572a96 | 674 | if (cmd->transport_state & CMD_T_REQUEST_STOP) { |
a1d8b49a | 675 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
cf572a96 | 676 | complete(&cmd->task_stop_comp); |
c66ac9db NB |
677 | return; |
678 | } | |
2235007c CH |
679 | |
680 | if (!success) | |
7d680f3b | 681 | cmd->transport_state |= CMD_T_FAILED; |
2235007c | 682 | |
3d28934a NB |
683 | /* |
684 | * Check for case where an explict ABORT_TASK has been received | |
685 | * and transport_wait_for_tasks() will be waiting for completion.. | |
686 | */ | |
687 | if (cmd->transport_state & CMD_T_ABORTED && | |
688 | cmd->transport_state & CMD_T_STOP) { | |
689 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
690 | complete(&cmd->t_transport_stop_comp); | |
691 | return; | |
692 | } else if (cmd->transport_state & CMD_T_FAILED) { | |
41e16e98 | 693 | cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
35e0e757 | 694 | INIT_WORK(&cmd->work, target_complete_failure_work); |
c66ac9db | 695 | } else { |
35e0e757 | 696 | INIT_WORK(&cmd->work, target_complete_ok_work); |
c66ac9db | 697 | } |
35e0e757 | 698 | |
35e0e757 | 699 | cmd->t_state = TRANSPORT_COMPLETE; |
3d28934a | 700 | cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE); |
a1d8b49a | 701 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 702 | |
35e0e757 | 703 | queue_work(target_completion_wq, &cmd->work); |
c66ac9db | 704 | } |
6bb35e00 CH |
705 | EXPORT_SYMBOL(target_complete_cmd); |
706 | ||
cf572a96 | 707 | static void target_add_to_state_list(struct se_cmd *cmd) |
c66ac9db | 708 | { |
cf572a96 CH |
709 | struct se_device *dev = cmd->se_dev; |
710 | unsigned long flags; | |
c66ac9db | 711 | |
cf572a96 CH |
712 | spin_lock_irqsave(&dev->execute_task_lock, flags); |
713 | if (!cmd->state_active) { | |
714 | list_add_tail(&cmd->state_list, &dev->state_list); | |
715 | cmd->state_active = true; | |
c66ac9db | 716 | } |
cf572a96 | 717 | spin_unlock_irqrestore(&dev->execute_task_lock, flags); |
c66ac9db NB |
718 | } |
719 | ||
07bde79a | 720 | /* |
f147abb4 | 721 | * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status |
07bde79a | 722 | */ |
7a6f0a1e CH |
723 | static void transport_write_pending_qf(struct se_cmd *cmd); |
724 | static void transport_complete_qf(struct se_cmd *cmd); | |
07bde79a NB |
725 | |
726 | static void target_qf_do_work(struct work_struct *work) | |
727 | { | |
728 | struct se_device *dev = container_of(work, struct se_device, | |
729 | qf_work_queue); | |
bcac364a | 730 | LIST_HEAD(qf_cmd_list); |
07bde79a NB |
731 | struct se_cmd *cmd, *cmd_tmp; |
732 | ||
733 | spin_lock_irq(&dev->qf_cmd_lock); | |
bcac364a RD |
734 | list_splice_init(&dev->qf_cmd_list, &qf_cmd_list); |
735 | spin_unlock_irq(&dev->qf_cmd_lock); | |
07bde79a | 736 | |
bcac364a | 737 | list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) { |
07bde79a NB |
738 | list_del(&cmd->se_qf_node); |
739 | atomic_dec(&dev->dev_qf_count); | |
740 | smp_mb__after_atomic_dec(); | |
07bde79a | 741 | |
6708bb27 | 742 | pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue" |
07bde79a | 743 | " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd, |
e057f533 | 744 | (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" : |
07bde79a NB |
745 | (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING" |
746 | : "UNKNOWN"); | |
f7a5cc0b | 747 | |
7a6f0a1e CH |
748 | if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) |
749 | transport_write_pending_qf(cmd); | |
750 | else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) | |
751 | transport_complete_qf(cmd); | |
07bde79a | 752 | } |
07bde79a NB |
753 | } |
754 | ||
c66ac9db NB |
755 | unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd) |
756 | { | |
757 | switch (cmd->data_direction) { | |
758 | case DMA_NONE: | |
759 | return "NONE"; | |
760 | case DMA_FROM_DEVICE: | |
761 | return "READ"; | |
762 | case DMA_TO_DEVICE: | |
763 | return "WRITE"; | |
764 | case DMA_BIDIRECTIONAL: | |
765 | return "BIDI"; | |
766 | default: | |
767 | break; | |
768 | } | |
769 | ||
770 | return "UNKNOWN"; | |
771 | } | |
772 | ||
773 | void transport_dump_dev_state( | |
774 | struct se_device *dev, | |
775 | char *b, | |
776 | int *bl) | |
777 | { | |
778 | *bl += sprintf(b + *bl, "Status: "); | |
779 | switch (dev->dev_status) { | |
780 | case TRANSPORT_DEVICE_ACTIVATED: | |
781 | *bl += sprintf(b + *bl, "ACTIVATED"); | |
782 | break; | |
783 | case TRANSPORT_DEVICE_DEACTIVATED: | |
784 | *bl += sprintf(b + *bl, "DEACTIVATED"); | |
785 | break; | |
786 | case TRANSPORT_DEVICE_SHUTDOWN: | |
787 | *bl += sprintf(b + *bl, "SHUTDOWN"); | |
788 | break; | |
789 | case TRANSPORT_DEVICE_OFFLINE_ACTIVATED: | |
790 | case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED: | |
791 | *bl += sprintf(b + *bl, "OFFLINE"); | |
792 | break; | |
793 | default: | |
794 | *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status); | |
795 | break; | |
796 | } | |
797 | ||
5f41a31d | 798 | *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth); |
11e764bd NB |
799 | *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n", |
800 | dev->se_sub_dev->se_dev_attrib.block_size, | |
801 | dev->se_sub_dev->se_dev_attrib.hw_max_sectors); | |
c66ac9db NB |
802 | *bl += sprintf(b + *bl, " "); |
803 | } | |
804 | ||
c66ac9db NB |
805 | void transport_dump_vpd_proto_id( |
806 | struct t10_vpd *vpd, | |
807 | unsigned char *p_buf, | |
808 | int p_buf_len) | |
809 | { | |
810 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
811 | int len; | |
812 | ||
813 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
814 | len = sprintf(buf, "T10 VPD Protocol Identifier: "); | |
815 | ||
816 | switch (vpd->protocol_identifier) { | |
817 | case 0x00: | |
818 | sprintf(buf+len, "Fibre Channel\n"); | |
819 | break; | |
820 | case 0x10: | |
821 | sprintf(buf+len, "Parallel SCSI\n"); | |
822 | break; | |
823 | case 0x20: | |
824 | sprintf(buf+len, "SSA\n"); | |
825 | break; | |
826 | case 0x30: | |
827 | sprintf(buf+len, "IEEE 1394\n"); | |
828 | break; | |
829 | case 0x40: | |
830 | sprintf(buf+len, "SCSI Remote Direct Memory Access" | |
831 | " Protocol\n"); | |
832 | break; | |
833 | case 0x50: | |
834 | sprintf(buf+len, "Internet SCSI (iSCSI)\n"); | |
835 | break; | |
836 | case 0x60: | |
837 | sprintf(buf+len, "SAS Serial SCSI Protocol\n"); | |
838 | break; | |
839 | case 0x70: | |
840 | sprintf(buf+len, "Automation/Drive Interface Transport" | |
841 | " Protocol\n"); | |
842 | break; | |
843 | case 0x80: | |
844 | sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n"); | |
845 | break; | |
846 | default: | |
847 | sprintf(buf+len, "Unknown 0x%02x\n", | |
848 | vpd->protocol_identifier); | |
849 | break; | |
850 | } | |
851 | ||
852 | if (p_buf) | |
853 | strncpy(p_buf, buf, p_buf_len); | |
854 | else | |
6708bb27 | 855 | pr_debug("%s", buf); |
c66ac9db NB |
856 | } |
857 | ||
858 | void | |
859 | transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83) | |
860 | { | |
861 | /* | |
862 | * Check if the Protocol Identifier Valid (PIV) bit is set.. | |
863 | * | |
864 | * from spc3r23.pdf section 7.5.1 | |
865 | */ | |
866 | if (page_83[1] & 0x80) { | |
867 | vpd->protocol_identifier = (page_83[0] & 0xf0); | |
868 | vpd->protocol_identifier_set = 1; | |
869 | transport_dump_vpd_proto_id(vpd, NULL, 0); | |
870 | } | |
871 | } | |
872 | EXPORT_SYMBOL(transport_set_vpd_proto_id); | |
873 | ||
874 | int transport_dump_vpd_assoc( | |
875 | struct t10_vpd *vpd, | |
876 | unsigned char *p_buf, | |
877 | int p_buf_len) | |
878 | { | |
879 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
e3d6f909 AG |
880 | int ret = 0; |
881 | int len; | |
c66ac9db NB |
882 | |
883 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
884 | len = sprintf(buf, "T10 VPD Identifier Association: "); | |
885 | ||
886 | switch (vpd->association) { | |
887 | case 0x00: | |
888 | sprintf(buf+len, "addressed logical unit\n"); | |
889 | break; | |
890 | case 0x10: | |
891 | sprintf(buf+len, "target port\n"); | |
892 | break; | |
893 | case 0x20: | |
894 | sprintf(buf+len, "SCSI target device\n"); | |
895 | break; | |
896 | default: | |
897 | sprintf(buf+len, "Unknown 0x%02x\n", vpd->association); | |
e3d6f909 | 898 | ret = -EINVAL; |
c66ac9db NB |
899 | break; |
900 | } | |
901 | ||
902 | if (p_buf) | |
903 | strncpy(p_buf, buf, p_buf_len); | |
904 | else | |
6708bb27 | 905 | pr_debug("%s", buf); |
c66ac9db NB |
906 | |
907 | return ret; | |
908 | } | |
909 | ||
910 | int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83) | |
911 | { | |
912 | /* | |
913 | * The VPD identification association.. | |
914 | * | |
915 | * from spc3r23.pdf Section 7.6.3.1 Table 297 | |
916 | */ | |
917 | vpd->association = (page_83[1] & 0x30); | |
918 | return transport_dump_vpd_assoc(vpd, NULL, 0); | |
919 | } | |
920 | EXPORT_SYMBOL(transport_set_vpd_assoc); | |
921 | ||
922 | int transport_dump_vpd_ident_type( | |
923 | struct t10_vpd *vpd, | |
924 | unsigned char *p_buf, | |
925 | int p_buf_len) | |
926 | { | |
927 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
e3d6f909 AG |
928 | int ret = 0; |
929 | int len; | |
c66ac9db NB |
930 | |
931 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
932 | len = sprintf(buf, "T10 VPD Identifier Type: "); | |
933 | ||
934 | switch (vpd->device_identifier_type) { | |
935 | case 0x00: | |
936 | sprintf(buf+len, "Vendor specific\n"); | |
937 | break; | |
938 | case 0x01: | |
939 | sprintf(buf+len, "T10 Vendor ID based\n"); | |
940 | break; | |
941 | case 0x02: | |
942 | sprintf(buf+len, "EUI-64 based\n"); | |
943 | break; | |
944 | case 0x03: | |
945 | sprintf(buf+len, "NAA\n"); | |
946 | break; | |
947 | case 0x04: | |
948 | sprintf(buf+len, "Relative target port identifier\n"); | |
949 | break; | |
950 | case 0x08: | |
951 | sprintf(buf+len, "SCSI name string\n"); | |
952 | break; | |
953 | default: | |
954 | sprintf(buf+len, "Unsupported: 0x%02x\n", | |
955 | vpd->device_identifier_type); | |
e3d6f909 | 956 | ret = -EINVAL; |
c66ac9db NB |
957 | break; |
958 | } | |
959 | ||
e3d6f909 AG |
960 | if (p_buf) { |
961 | if (p_buf_len < strlen(buf)+1) | |
962 | return -EINVAL; | |
c66ac9db | 963 | strncpy(p_buf, buf, p_buf_len); |
e3d6f909 | 964 | } else { |
6708bb27 | 965 | pr_debug("%s", buf); |
e3d6f909 | 966 | } |
c66ac9db NB |
967 | |
968 | return ret; | |
969 | } | |
970 | ||
971 | int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83) | |
972 | { | |
973 | /* | |
974 | * The VPD identifier type.. | |
975 | * | |
976 | * from spc3r23.pdf Section 7.6.3.1 Table 298 | |
977 | */ | |
978 | vpd->device_identifier_type = (page_83[1] & 0x0f); | |
979 | return transport_dump_vpd_ident_type(vpd, NULL, 0); | |
980 | } | |
981 | EXPORT_SYMBOL(transport_set_vpd_ident_type); | |
982 | ||
983 | int transport_dump_vpd_ident( | |
984 | struct t10_vpd *vpd, | |
985 | unsigned char *p_buf, | |
986 | int p_buf_len) | |
987 | { | |
988 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
989 | int ret = 0; | |
990 | ||
991 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
992 | ||
993 | switch (vpd->device_identifier_code_set) { | |
994 | case 0x01: /* Binary */ | |
995 | sprintf(buf, "T10 VPD Binary Device Identifier: %s\n", | |
996 | &vpd->device_identifier[0]); | |
997 | break; | |
998 | case 0x02: /* ASCII */ | |
999 | sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n", | |
1000 | &vpd->device_identifier[0]); | |
1001 | break; | |
1002 | case 0x03: /* UTF-8 */ | |
1003 | sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n", | |
1004 | &vpd->device_identifier[0]); | |
1005 | break; | |
1006 | default: | |
1007 | sprintf(buf, "T10 VPD Device Identifier encoding unsupported:" | |
1008 | " 0x%02x", vpd->device_identifier_code_set); | |
e3d6f909 | 1009 | ret = -EINVAL; |
c66ac9db NB |
1010 | break; |
1011 | } | |
1012 | ||
1013 | if (p_buf) | |
1014 | strncpy(p_buf, buf, p_buf_len); | |
1015 | else | |
6708bb27 | 1016 | pr_debug("%s", buf); |
c66ac9db NB |
1017 | |
1018 | return ret; | |
1019 | } | |
1020 | ||
1021 | int | |
1022 | transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83) | |
1023 | { | |
1024 | static const char hex_str[] = "0123456789abcdef"; | |
1025 | int j = 0, i = 4; /* offset to start of the identifer */ | |
1026 | ||
1027 | /* | |
1028 | * The VPD Code Set (encoding) | |
1029 | * | |
1030 | * from spc3r23.pdf Section 7.6.3.1 Table 296 | |
1031 | */ | |
1032 | vpd->device_identifier_code_set = (page_83[0] & 0x0f); | |
1033 | switch (vpd->device_identifier_code_set) { | |
1034 | case 0x01: /* Binary */ | |
1035 | vpd->device_identifier[j++] = | |
1036 | hex_str[vpd->device_identifier_type]; | |
1037 | while (i < (4 + page_83[3])) { | |
1038 | vpd->device_identifier[j++] = | |
1039 | hex_str[(page_83[i] & 0xf0) >> 4]; | |
1040 | vpd->device_identifier[j++] = | |
1041 | hex_str[page_83[i] & 0x0f]; | |
1042 | i++; | |
1043 | } | |
1044 | break; | |
1045 | case 0x02: /* ASCII */ | |
1046 | case 0x03: /* UTF-8 */ | |
1047 | while (i < (4 + page_83[3])) | |
1048 | vpd->device_identifier[j++] = page_83[i++]; | |
1049 | break; | |
1050 | default: | |
1051 | break; | |
1052 | } | |
1053 | ||
1054 | return transport_dump_vpd_ident(vpd, NULL, 0); | |
1055 | } | |
1056 | EXPORT_SYMBOL(transport_set_vpd_ident); | |
1057 | ||
1058 | static void core_setup_task_attr_emulation(struct se_device *dev) | |
1059 | { | |
1060 | /* | |
1061 | * If this device is from Target_Core_Mod/pSCSI, disable the | |
1062 | * SAM Task Attribute emulation. | |
1063 | * | |
1064 | * This is currently not available in upsream Linux/SCSI Target | |
1065 | * mode code, and is assumed to be disabled while using TCM/pSCSI. | |
1066 | */ | |
e3d6f909 | 1067 | if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) { |
c66ac9db NB |
1068 | dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH; |
1069 | return; | |
1070 | } | |
1071 | ||
1072 | dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED; | |
6708bb27 | 1073 | pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x" |
e3d6f909 AG |
1074 | " device\n", dev->transport->name, |
1075 | dev->transport->get_device_rev(dev)); | |
c66ac9db NB |
1076 | } |
1077 | ||
1078 | static void scsi_dump_inquiry(struct se_device *dev) | |
1079 | { | |
e3d6f909 | 1080 | struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn; |
e59a41b6 | 1081 | char buf[17]; |
c66ac9db NB |
1082 | int i, device_type; |
1083 | /* | |
1084 | * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer | |
1085 | */ | |
c66ac9db NB |
1086 | for (i = 0; i < 8; i++) |
1087 | if (wwn->vendor[i] >= 0x20) | |
e59a41b6 | 1088 | buf[i] = wwn->vendor[i]; |
c66ac9db | 1089 | else |
e59a41b6 SAS |
1090 | buf[i] = ' '; |
1091 | buf[i] = '\0'; | |
1092 | pr_debug(" Vendor: %s\n", buf); | |
c66ac9db | 1093 | |
c66ac9db NB |
1094 | for (i = 0; i < 16; i++) |
1095 | if (wwn->model[i] >= 0x20) | |
e59a41b6 | 1096 | buf[i] = wwn->model[i]; |
c66ac9db | 1097 | else |
e59a41b6 SAS |
1098 | buf[i] = ' '; |
1099 | buf[i] = '\0'; | |
1100 | pr_debug(" Model: %s\n", buf); | |
c66ac9db | 1101 | |
c66ac9db NB |
1102 | for (i = 0; i < 4; i++) |
1103 | if (wwn->revision[i] >= 0x20) | |
e59a41b6 | 1104 | buf[i] = wwn->revision[i]; |
c66ac9db | 1105 | else |
e59a41b6 SAS |
1106 | buf[i] = ' '; |
1107 | buf[i] = '\0'; | |
1108 | pr_debug(" Revision: %s\n", buf); | |
c66ac9db | 1109 | |
e3d6f909 | 1110 | device_type = dev->transport->get_device_type(dev); |
6708bb27 AG |
1111 | pr_debug(" Type: %s ", scsi_device_type(device_type)); |
1112 | pr_debug(" ANSI SCSI revision: %02x\n", | |
e3d6f909 | 1113 | dev->transport->get_device_rev(dev)); |
c66ac9db NB |
1114 | } |
1115 | ||
1116 | struct se_device *transport_add_device_to_core_hba( | |
1117 | struct se_hba *hba, | |
1118 | struct se_subsystem_api *transport, | |
1119 | struct se_subsystem_dev *se_dev, | |
1120 | u32 device_flags, | |
1121 | void *transport_dev, | |
1122 | struct se_dev_limits *dev_limits, | |
1123 | const char *inquiry_prod, | |
1124 | const char *inquiry_rev) | |
1125 | { | |
12a18bdc | 1126 | int force_pt; |
c66ac9db NB |
1127 | struct se_device *dev; |
1128 | ||
1129 | dev = kzalloc(sizeof(struct se_device), GFP_KERNEL); | |
6708bb27 AG |
1130 | if (!dev) { |
1131 | pr_err("Unable to allocate memory for se_dev_t\n"); | |
c66ac9db NB |
1132 | return NULL; |
1133 | } | |
c66ac9db | 1134 | |
e3d6f909 | 1135 | transport_init_queue_obj(&dev->dev_queue_obj); |
c66ac9db NB |
1136 | dev->dev_flags = device_flags; |
1137 | dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED; | |
5951146d | 1138 | dev->dev_ptr = transport_dev; |
c66ac9db NB |
1139 | dev->se_hba = hba; |
1140 | dev->se_sub_dev = se_dev; | |
1141 | dev->transport = transport; | |
c66ac9db NB |
1142 | INIT_LIST_HEAD(&dev->dev_list); |
1143 | INIT_LIST_HEAD(&dev->dev_sep_list); | |
1144 | INIT_LIST_HEAD(&dev->dev_tmr_list); | |
c66ac9db | 1145 | INIT_LIST_HEAD(&dev->delayed_cmd_list); |
cf572a96 | 1146 | INIT_LIST_HEAD(&dev->state_list); |
07bde79a | 1147 | INIT_LIST_HEAD(&dev->qf_cmd_list); |
c66ac9db NB |
1148 | spin_lock_init(&dev->execute_task_lock); |
1149 | spin_lock_init(&dev->delayed_cmd_lock); | |
c66ac9db NB |
1150 | spin_lock_init(&dev->dev_reservation_lock); |
1151 | spin_lock_init(&dev->dev_status_lock); | |
c66ac9db NB |
1152 | spin_lock_init(&dev->se_port_lock); |
1153 | spin_lock_init(&dev->se_tmr_lock); | |
07bde79a | 1154 | spin_lock_init(&dev->qf_cmd_lock); |
c66ac9db NB |
1155 | atomic_set(&dev->dev_ordered_id, 0); |
1156 | ||
1157 | se_dev_set_default_attribs(dev, dev_limits); | |
1158 | ||
1159 | dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX); | |
1160 | dev->creation_time = get_jiffies_64(); | |
1161 | spin_lock_init(&dev->stats_lock); | |
1162 | ||
1163 | spin_lock(&hba->device_lock); | |
1164 | list_add_tail(&dev->dev_list, &hba->hba_dev_list); | |
1165 | hba->dev_count++; | |
1166 | spin_unlock(&hba->device_lock); | |
1167 | /* | |
1168 | * Setup the SAM Task Attribute emulation for struct se_device | |
1169 | */ | |
1170 | core_setup_task_attr_emulation(dev); | |
1171 | /* | |
1172 | * Force PR and ALUA passthrough emulation with internal object use. | |
1173 | */ | |
1174 | force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE); | |
1175 | /* | |
1176 | * Setup the Reservations infrastructure for struct se_device | |
1177 | */ | |
1178 | core_setup_reservations(dev, force_pt); | |
1179 | /* | |
1180 | * Setup the Asymmetric Logical Unit Assignment for struct se_device | |
1181 | */ | |
1182 | if (core_setup_alua(dev, force_pt) < 0) | |
1183 | goto out; | |
1184 | ||
1185 | /* | |
1186 | * Startup the struct se_device processing thread | |
1187 | */ | |
1188 | dev->process_thread = kthread_run(transport_processing_thread, dev, | |
e3d6f909 | 1189 | "LIO_%s", dev->transport->name); |
c66ac9db | 1190 | if (IS_ERR(dev->process_thread)) { |
6708bb27 | 1191 | pr_err("Unable to create kthread: LIO_%s\n", |
e3d6f909 | 1192 | dev->transport->name); |
c66ac9db NB |
1193 | goto out; |
1194 | } | |
07bde79a NB |
1195 | /* |
1196 | * Setup work_queue for QUEUE_FULL | |
1197 | */ | |
1198 | INIT_WORK(&dev->qf_work_queue, target_qf_do_work); | |
c66ac9db NB |
1199 | /* |
1200 | * Preload the initial INQUIRY const values if we are doing | |
1201 | * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI | |
1202 | * passthrough because this is being provided by the backend LLD. | |
1203 | * This is required so that transport_get_inquiry() copies these | |
1204 | * originals once back into DEV_T10_WWN(dev) for the virtual device | |
1205 | * setup. | |
1206 | */ | |
e3d6f909 | 1207 | if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) { |
f22c1196 | 1208 | if (!inquiry_prod || !inquiry_rev) { |
6708bb27 | 1209 | pr_err("All non TCM/pSCSI plugins require" |
c66ac9db NB |
1210 | " INQUIRY consts\n"); |
1211 | goto out; | |
1212 | } | |
1213 | ||
e3d6f909 AG |
1214 | strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8); |
1215 | strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16); | |
1216 | strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4); | |
c66ac9db NB |
1217 | } |
1218 | scsi_dump_inquiry(dev); | |
1219 | ||
12a18bdc | 1220 | return dev; |
c66ac9db | 1221 | out: |
c66ac9db NB |
1222 | kthread_stop(dev->process_thread); |
1223 | ||
1224 | spin_lock(&hba->device_lock); | |
1225 | list_del(&dev->dev_list); | |
1226 | hba->dev_count--; | |
1227 | spin_unlock(&hba->device_lock); | |
1228 | ||
1229 | se_release_vpd_for_dev(dev); | |
1230 | ||
c66ac9db NB |
1231 | kfree(dev); |
1232 | ||
1233 | return NULL; | |
1234 | } | |
1235 | EXPORT_SYMBOL(transport_add_device_to_core_hba); | |
1236 | ||
1fd032ee | 1237 | int target_cmd_size_check(struct se_cmd *cmd, unsigned int size) |
9b3b8041 CH |
1238 | { |
1239 | struct se_device *dev = cmd->se_dev; | |
1240 | ||
1241 | if (cmd->unknown_data_length) { | |
1242 | cmd->data_length = size; | |
1243 | } else if (size != cmd->data_length) { | |
1244 | pr_warn("TARGET_CORE[%s]: Expected Transfer Length:" | |
1245 | " %u does not match SCSI CDB Length: %u for SAM Opcode:" | |
1246 | " 0x%02x\n", cmd->se_tfo->get_fabric_name(), | |
1247 | cmd->data_length, size, cmd->t_task_cdb[0]); | |
1248 | ||
1249 | cmd->cmd_spdtl = size; | |
1250 | ||
1251 | if (cmd->data_direction == DMA_TO_DEVICE) { | |
1252 | pr_err("Rejecting underflow/overflow" | |
1253 | " WRITE data\n"); | |
1254 | goto out_invalid_cdb_field; | |
1255 | } | |
1256 | /* | |
1257 | * Reject READ_* or WRITE_* with overflow/underflow for | |
1258 | * type SCF_SCSI_DATA_CDB. | |
1259 | */ | |
1260 | if (dev->se_sub_dev->se_dev_attrib.block_size != 512) { | |
1261 | pr_err("Failing OVERFLOW/UNDERFLOW for LBA op" | |
1262 | " CDB on non 512-byte sector setup subsystem" | |
1263 | " plugin: %s\n", dev->transport->name); | |
1264 | /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */ | |
1265 | goto out_invalid_cdb_field; | |
1266 | } | |
1267 | ||
1268 | if (size > cmd->data_length) { | |
1269 | cmd->se_cmd_flags |= SCF_OVERFLOW_BIT; | |
1270 | cmd->residual_count = (size - cmd->data_length); | |
1271 | } else { | |
1272 | cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT; | |
1273 | cmd->residual_count = (cmd->data_length - size); | |
1274 | } | |
1275 | cmd->data_length = size; | |
1276 | } | |
1277 | ||
1278 | return 0; | |
1279 | ||
1280 | out_invalid_cdb_field: | |
1281 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
1282 | cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; | |
1283 | return -EINVAL; | |
1284 | } | |
1285 | ||
c66ac9db NB |
1286 | /* |
1287 | * Used by fabric modules containing a local struct se_cmd within their | |
1288 | * fabric dependent per I/O descriptor. | |
1289 | */ | |
1290 | void transport_init_se_cmd( | |
1291 | struct se_cmd *cmd, | |
1292 | struct target_core_fabric_ops *tfo, | |
1293 | struct se_session *se_sess, | |
1294 | u32 data_length, | |
1295 | int data_direction, | |
1296 | int task_attr, | |
1297 | unsigned char *sense_buffer) | |
1298 | { | |
5951146d AG |
1299 | INIT_LIST_HEAD(&cmd->se_lun_node); |
1300 | INIT_LIST_HEAD(&cmd->se_delayed_node); | |
07bde79a | 1301 | INIT_LIST_HEAD(&cmd->se_qf_node); |
79a7fef2 | 1302 | INIT_LIST_HEAD(&cmd->se_queue_node); |
a17f091d | 1303 | INIT_LIST_HEAD(&cmd->se_cmd_list); |
cf572a96 | 1304 | INIT_LIST_HEAD(&cmd->state_list); |
a1d8b49a AG |
1305 | init_completion(&cmd->transport_lun_fe_stop_comp); |
1306 | init_completion(&cmd->transport_lun_stop_comp); | |
1307 | init_completion(&cmd->t_transport_stop_comp); | |
a17f091d | 1308 | init_completion(&cmd->cmd_wait_comp); |
cf572a96 | 1309 | init_completion(&cmd->task_stop_comp); |
a1d8b49a | 1310 | spin_lock_init(&cmd->t_state_lock); |
7d680f3b | 1311 | cmd->transport_state = CMD_T_DEV_ACTIVE; |
c66ac9db NB |
1312 | |
1313 | cmd->se_tfo = tfo; | |
1314 | cmd->se_sess = se_sess; | |
1315 | cmd->data_length = data_length; | |
1316 | cmd->data_direction = data_direction; | |
1317 | cmd->sam_task_attr = task_attr; | |
1318 | cmd->sense_buffer = sense_buffer; | |
cf572a96 CH |
1319 | |
1320 | cmd->state_active = false; | |
c66ac9db NB |
1321 | } |
1322 | EXPORT_SYMBOL(transport_init_se_cmd); | |
1323 | ||
1324 | static int transport_check_alloc_task_attr(struct se_cmd *cmd) | |
1325 | { | |
1326 | /* | |
1327 | * Check if SAM Task Attribute emulation is enabled for this | |
1328 | * struct se_device storage object | |
1329 | */ | |
5951146d | 1330 | if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) |
c66ac9db NB |
1331 | return 0; |
1332 | ||
e66ecd50 | 1333 | if (cmd->sam_task_attr == MSG_ACA_TAG) { |
6708bb27 | 1334 | pr_debug("SAM Task Attribute ACA" |
c66ac9db | 1335 | " emulation is not supported\n"); |
e3d6f909 | 1336 | return -EINVAL; |
c66ac9db NB |
1337 | } |
1338 | /* | |
1339 | * Used to determine when ORDERED commands should go from | |
1340 | * Dormant to Active status. | |
1341 | */ | |
5951146d | 1342 | cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id); |
c66ac9db | 1343 | smp_mb__after_atomic_inc(); |
6708bb27 | 1344 | pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n", |
c66ac9db | 1345 | cmd->se_ordered_id, cmd->sam_task_attr, |
6708bb27 | 1346 | cmd->se_dev->transport->name); |
c66ac9db NB |
1347 | return 0; |
1348 | } | |
1349 | ||
a12f41f8 | 1350 | /* target_setup_cmd_from_cdb(): |
c66ac9db NB |
1351 | * |
1352 | * Called from fabric RX Thread. | |
1353 | */ | |
a12f41f8 | 1354 | int target_setup_cmd_from_cdb( |
c66ac9db NB |
1355 | struct se_cmd *cmd, |
1356 | unsigned char *cdb) | |
1357 | { | |
cb4f4d3c CH |
1358 | struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev; |
1359 | u32 pr_reg_type = 0; | |
1360 | u8 alua_ascq = 0; | |
1361 | unsigned long flags; | |
c66ac9db NB |
1362 | int ret; |
1363 | ||
c66ac9db NB |
1364 | /* |
1365 | * Ensure that the received CDB is less than the max (252 + 8) bytes | |
1366 | * for VARIABLE_LENGTH_CMD | |
1367 | */ | |
1368 | if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) { | |
6708bb27 | 1369 | pr_err("Received SCSI CDB with command_size: %d that" |
c66ac9db NB |
1370 | " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n", |
1371 | scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE); | |
03e98c9e NB |
1372 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; |
1373 | cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; | |
e3d6f909 | 1374 | return -EINVAL; |
c66ac9db NB |
1375 | } |
1376 | /* | |
1377 | * If the received CDB is larger than TCM_MAX_COMMAND_SIZE, | |
1378 | * allocate the additional extended CDB buffer now.. Otherwise | |
1379 | * setup the pointer from __t_task_cdb to t_task_cdb. | |
1380 | */ | |
a1d8b49a AG |
1381 | if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) { |
1382 | cmd->t_task_cdb = kzalloc(scsi_command_size(cdb), | |
c66ac9db | 1383 | GFP_KERNEL); |
6708bb27 AG |
1384 | if (!cmd->t_task_cdb) { |
1385 | pr_err("Unable to allocate cmd->t_task_cdb" | |
a1d8b49a | 1386 | " %u > sizeof(cmd->__t_task_cdb): %lu ops\n", |
c66ac9db | 1387 | scsi_command_size(cdb), |
a1d8b49a | 1388 | (unsigned long)sizeof(cmd->__t_task_cdb)); |
03e98c9e NB |
1389 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; |
1390 | cmd->scsi_sense_reason = | |
1391 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
e3d6f909 | 1392 | return -ENOMEM; |
c66ac9db NB |
1393 | } |
1394 | } else | |
a1d8b49a | 1395 | cmd->t_task_cdb = &cmd->__t_task_cdb[0]; |
c66ac9db | 1396 | /* |
a1d8b49a | 1397 | * Copy the original CDB into cmd-> |
c66ac9db | 1398 | */ |
a1d8b49a | 1399 | memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb)); |
cb4f4d3c CH |
1400 | |
1401 | /* | |
1402 | * Check for an existing UNIT ATTENTION condition | |
1403 | */ | |
1404 | if (core_scsi3_ua_check(cmd, cdb) < 0) { | |
1405 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
1406 | cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION; | |
1407 | return -EINVAL; | |
1408 | } | |
1409 | ||
1410 | ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq); | |
1411 | if (ret != 0) { | |
1412 | /* | |
1413 | * Set SCSI additional sense code (ASC) to 'LUN Not Accessible'; | |
1414 | * The ALUA additional sense code qualifier (ASCQ) is determined | |
1415 | * by the ALUA primary or secondary access state.. | |
1416 | */ | |
1417 | if (ret > 0) { | |
1418 | pr_debug("[%s]: ALUA TG Port not available, " | |
1419 | "SenseKey: NOT_READY, ASC/ASCQ: " | |
1420 | "0x04/0x%02x\n", | |
1421 | cmd->se_tfo->get_fabric_name(), alua_ascq); | |
1422 | ||
1423 | transport_set_sense_codes(cmd, 0x04, alua_ascq); | |
1424 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
1425 | cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY; | |
1426 | return -EINVAL; | |
1427 | } | |
1428 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
1429 | cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; | |
1430 | return -EINVAL; | |
1431 | } | |
1432 | ||
1433 | /* | |
1434 | * Check status for SPC-3 Persistent Reservations | |
1435 | */ | |
1436 | if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type)) { | |
1437 | if (su_dev->t10_pr.pr_ops.t10_seq_non_holder( | |
1438 | cmd, cdb, pr_reg_type) != 0) { | |
1439 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
1440 | cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT; | |
1441 | cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT; | |
1442 | cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; | |
1443 | return -EBUSY; | |
1444 | } | |
1445 | /* | |
1446 | * This means the CDB is allowed for the SCSI Initiator port | |
1447 | * when said port is *NOT* holding the legacy SPC-2 or | |
1448 | * SPC-3 Persistent Reservation. | |
1449 | */ | |
1450 | } | |
1451 | ||
1fd032ee | 1452 | ret = cmd->se_dev->transport->parse_cdb(cmd); |
c66ac9db NB |
1453 | if (ret < 0) |
1454 | return ret; | |
cb4f4d3c CH |
1455 | |
1456 | spin_lock_irqsave(&cmd->t_state_lock, flags); | |
1457 | cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE; | |
1458 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
1459 | ||
c66ac9db NB |
1460 | /* |
1461 | * Check for SAM Task Attribute Emulation | |
1462 | */ | |
1463 | if (transport_check_alloc_task_attr(cmd) < 0) { | |
1464 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
1465 | cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; | |
5951146d | 1466 | return -EINVAL; |
c66ac9db NB |
1467 | } |
1468 | spin_lock(&cmd->se_lun->lun_sep_lock); | |
1469 | if (cmd->se_lun->lun_sep) | |
1470 | cmd->se_lun->lun_sep->sep_stats.cmd_pdus++; | |
1471 | spin_unlock(&cmd->se_lun->lun_sep_lock); | |
1472 | return 0; | |
1473 | } | |
a12f41f8 | 1474 | EXPORT_SYMBOL(target_setup_cmd_from_cdb); |
c66ac9db | 1475 | |
695434e1 NB |
1476 | /* |
1477 | * Used by fabric module frontends to queue tasks directly. | |
1478 | * Many only be used from process context only | |
1479 | */ | |
1480 | int transport_handle_cdb_direct( | |
1481 | struct se_cmd *cmd) | |
1482 | { | |
dd8ae59d NB |
1483 | int ret; |
1484 | ||
695434e1 NB |
1485 | if (!cmd->se_lun) { |
1486 | dump_stack(); | |
6708bb27 | 1487 | pr_err("cmd->se_lun is NULL\n"); |
695434e1 NB |
1488 | return -EINVAL; |
1489 | } | |
1490 | if (in_interrupt()) { | |
1491 | dump_stack(); | |
6708bb27 | 1492 | pr_err("transport_generic_handle_cdb cannot be called" |
695434e1 NB |
1493 | " from interrupt context\n"); |
1494 | return -EINVAL; | |
1495 | } | |
dd8ae59d | 1496 | /* |
7d680f3b | 1497 | * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE following |
dd8ae59d NB |
1498 | * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue() |
1499 | * in existing usage to ensure that outstanding descriptors are handled | |
d14921d6 | 1500 | * correctly during shutdown via transport_wait_for_tasks() |
dd8ae59d NB |
1501 | * |
1502 | * Also, we don't take cmd->t_state_lock here as we only expect | |
1503 | * this to be called for initial descriptor submission. | |
1504 | */ | |
1505 | cmd->t_state = TRANSPORT_NEW_CMD; | |
7d680f3b CH |
1506 | cmd->transport_state |= CMD_T_ACTIVE; |
1507 | ||
dd8ae59d NB |
1508 | /* |
1509 | * transport_generic_new_cmd() is already handling QUEUE_FULL, | |
1510 | * so follow TRANSPORT_NEW_CMD processing thread context usage | |
1511 | * and call transport_generic_request_failure() if necessary.. | |
1512 | */ | |
1513 | ret = transport_generic_new_cmd(cmd); | |
03e98c9e NB |
1514 | if (ret < 0) |
1515 | transport_generic_request_failure(cmd); | |
1516 | ||
dd8ae59d | 1517 | return 0; |
695434e1 NB |
1518 | } |
1519 | EXPORT_SYMBOL(transport_handle_cdb_direct); | |
1520 | ||
a6360785 NB |
1521 | /** |
1522 | * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd | |
1523 | * | |
1524 | * @se_cmd: command descriptor to submit | |
1525 | * @se_sess: associated se_sess for endpoint | |
1526 | * @cdb: pointer to SCSI CDB | |
1527 | * @sense: pointer to SCSI sense buffer | |
1528 | * @unpacked_lun: unpacked LUN to reference for struct se_lun | |
1529 | * @data_length: fabric expected data transfer length | |
1530 | * @task_addr: SAM task attribute | |
1531 | * @data_dir: DMA data direction | |
1532 | * @flags: flags for command submission from target_sc_flags_tables | |
1533 | * | |
1534 | * This may only be called from process context, and also currently | |
1535 | * assumes internal allocation of fabric payload buffer by target-core. | |
1536 | **/ | |
1edcdb49 | 1537 | void target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess, |
a6360785 NB |
1538 | unsigned char *cdb, unsigned char *sense, u32 unpacked_lun, |
1539 | u32 data_length, int task_attr, int data_dir, int flags) | |
1540 | { | |
1541 | struct se_portal_group *se_tpg; | |
1542 | int rc; | |
1543 | ||
1544 | se_tpg = se_sess->se_tpg; | |
1545 | BUG_ON(!se_tpg); | |
1546 | BUG_ON(se_cmd->se_tfo || se_cmd->se_sess); | |
1547 | BUG_ON(in_interrupt()); | |
1548 | /* | |
1549 | * Initialize se_cmd for target operation. From this point | |
1550 | * exceptions are handled by sending exception status via | |
1551 | * target_core_fabric_ops->queue_status() callback | |
1552 | */ | |
1553 | transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, | |
1554 | data_length, data_dir, task_attr, sense); | |
b0d79946 SAS |
1555 | if (flags & TARGET_SCF_UNKNOWN_SIZE) |
1556 | se_cmd->unknown_data_length = 1; | |
a6360785 NB |
1557 | /* |
1558 | * Obtain struct se_cmd->cmd_kref reference and add new cmd to | |
1559 | * se_sess->sess_cmd_list. A second kref_get here is necessary | |
1560 | * for fabrics using TARGET_SCF_ACK_KREF that expect a second | |
1561 | * kref_put() to happen during fabric packet acknowledgement. | |
1562 | */ | |
1563 | target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF)); | |
1564 | /* | |
1565 | * Signal bidirectional data payloads to target-core | |
1566 | */ | |
1567 | if (flags & TARGET_SCF_BIDI_OP) | |
1568 | se_cmd->se_cmd_flags |= SCF_BIDI; | |
1569 | /* | |
1570 | * Locate se_lun pointer and attach it to struct se_cmd | |
1571 | */ | |
735703ca NB |
1572 | if (transport_lookup_cmd_lun(se_cmd, unpacked_lun) < 0) { |
1573 | transport_send_check_condition_and_sense(se_cmd, | |
1574 | se_cmd->scsi_sense_reason, 0); | |
1575 | target_put_sess_cmd(se_sess, se_cmd); | |
1576 | return; | |
1577 | } | |
d6e0175c | 1578 | |
a12f41f8 | 1579 | rc = target_setup_cmd_from_cdb(se_cmd, cdb); |
735703ca NB |
1580 | if (rc != 0) { |
1581 | transport_generic_request_failure(se_cmd); | |
1582 | return; | |
1583 | } | |
11e319ed AG |
1584 | |
1585 | /* | |
1586 | * Check if we need to delay processing because of ALUA | |
1587 | * Active/NonOptimized primary access state.. | |
1588 | */ | |
1589 | core_alua_check_nonop_delay(se_cmd); | |
1590 | ||
a6360785 | 1591 | transport_handle_cdb_direct(se_cmd); |
1edcdb49 | 1592 | return; |
a6360785 NB |
1593 | } |
1594 | EXPORT_SYMBOL(target_submit_cmd); | |
1595 | ||
9f0d05c2 NB |
1596 | static void target_complete_tmr_failure(struct work_struct *work) |
1597 | { | |
1598 | struct se_cmd *se_cmd = container_of(work, struct se_cmd, work); | |
1599 | ||
1600 | se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST; | |
1601 | se_cmd->se_tfo->queue_tm_rsp(se_cmd); | |
1602 | transport_generic_free_cmd(se_cmd, 0); | |
1603 | } | |
1604 | ||
ea98d7f9 AG |
1605 | /** |
1606 | * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd | |
1607 | * for TMR CDBs | |
1608 | * | |
1609 | * @se_cmd: command descriptor to submit | |
1610 | * @se_sess: associated se_sess for endpoint | |
1611 | * @sense: pointer to SCSI sense buffer | |
1612 | * @unpacked_lun: unpacked LUN to reference for struct se_lun | |
1613 | * @fabric_context: fabric context for TMR req | |
1614 | * @tm_type: Type of TM request | |
c0974f89 NB |
1615 | * @gfp: gfp type for caller |
1616 | * @tag: referenced task tag for TMR_ABORT_TASK | |
c7042cae | 1617 | * @flags: submit cmd flags |
ea98d7f9 AG |
1618 | * |
1619 | * Callable from all contexts. | |
1620 | **/ | |
1621 | ||
c7042cae | 1622 | int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess, |
ea98d7f9 | 1623 | unsigned char *sense, u32 unpacked_lun, |
c0974f89 NB |
1624 | void *fabric_tmr_ptr, unsigned char tm_type, |
1625 | gfp_t gfp, unsigned int tag, int flags) | |
ea98d7f9 AG |
1626 | { |
1627 | struct se_portal_group *se_tpg; | |
1628 | int ret; | |
1629 | ||
1630 | se_tpg = se_sess->se_tpg; | |
1631 | BUG_ON(!se_tpg); | |
1632 | ||
1633 | transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, | |
1634 | 0, DMA_NONE, MSG_SIMPLE_TAG, sense); | |
c7042cae NB |
1635 | /* |
1636 | * FIXME: Currently expect caller to handle se_cmd->se_tmr_req | |
1637 | * allocation failure. | |
1638 | */ | |
c0974f89 | 1639 | ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp); |
c7042cae NB |
1640 | if (ret < 0) |
1641 | return -ENOMEM; | |
ea98d7f9 | 1642 | |
c0974f89 NB |
1643 | if (tm_type == TMR_ABORT_TASK) |
1644 | se_cmd->se_tmr_req->ref_task_tag = tag; | |
1645 | ||
ea98d7f9 AG |
1646 | /* See target_submit_cmd for commentary */ |
1647 | target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF)); | |
1648 | ||
ea98d7f9 AG |
1649 | ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun); |
1650 | if (ret) { | |
9f0d05c2 NB |
1651 | /* |
1652 | * For callback during failure handling, push this work off | |
1653 | * to process context with TMR_LUN_DOES_NOT_EXIST status. | |
1654 | */ | |
1655 | INIT_WORK(&se_cmd->work, target_complete_tmr_failure); | |
1656 | schedule_work(&se_cmd->work); | |
c7042cae | 1657 | return 0; |
ea98d7f9 AG |
1658 | } |
1659 | transport_generic_handle_tmr(se_cmd); | |
c7042cae | 1660 | return 0; |
ea98d7f9 AG |
1661 | } |
1662 | EXPORT_SYMBOL(target_submit_tmr); | |
1663 | ||
c66ac9db NB |
1664 | /* transport_generic_handle_tmr(): |
1665 | * | |
1666 | * | |
1667 | */ | |
1668 | int transport_generic_handle_tmr( | |
1669 | struct se_cmd *cmd) | |
1670 | { | |
f7a5cc0b | 1671 | transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR, false); |
c66ac9db NB |
1672 | return 0; |
1673 | } | |
1674 | EXPORT_SYMBOL(transport_generic_handle_tmr); | |
1675 | ||
cdbb70bb | 1676 | /* |
cf572a96 | 1677 | * If the cmd is active, request it to be stopped and sleep until it |
cdbb70bb CH |
1678 | * has completed. |
1679 | */ | |
cf572a96 | 1680 | bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags) |
cdbb70bb | 1681 | { |
cdbb70bb CH |
1682 | bool was_active = false; |
1683 | ||
cf572a96 CH |
1684 | if (cmd->transport_state & CMD_T_BUSY) { |
1685 | cmd->transport_state |= CMD_T_REQUEST_STOP; | |
cdbb70bb CH |
1686 | spin_unlock_irqrestore(&cmd->t_state_lock, *flags); |
1687 | ||
cf572a96 CH |
1688 | pr_debug("cmd %p waiting to complete\n", cmd); |
1689 | wait_for_completion(&cmd->task_stop_comp); | |
1690 | pr_debug("cmd %p stopped successfully\n", cmd); | |
cdbb70bb CH |
1691 | |
1692 | spin_lock_irqsave(&cmd->t_state_lock, *flags); | |
cf572a96 CH |
1693 | cmd->transport_state &= ~CMD_T_REQUEST_STOP; |
1694 | cmd->transport_state &= ~CMD_T_BUSY; | |
cdbb70bb CH |
1695 | was_active = true; |
1696 | } | |
1697 | ||
cdbb70bb CH |
1698 | return was_active; |
1699 | } | |
1700 | ||
c66ac9db NB |
1701 | /* |
1702 | * Handle SAM-esque emulation for generic transport request failures. | |
1703 | */ | |
2fbff127 | 1704 | void transport_generic_request_failure(struct se_cmd *cmd) |
c66ac9db | 1705 | { |
07bde79a NB |
1706 | int ret = 0; |
1707 | ||
6708bb27 | 1708 | pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x" |
e3d6f909 | 1709 | " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd), |
a1d8b49a | 1710 | cmd->t_task_cdb[0]); |
03e98c9e | 1711 | pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n", |
e3d6f909 | 1712 | cmd->se_tfo->get_cmd_state(cmd), |
03e98c9e | 1713 | cmd->t_state, cmd->scsi_sense_reason); |
d43d6aea | 1714 | pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n", |
7d680f3b CH |
1715 | (cmd->transport_state & CMD_T_ACTIVE) != 0, |
1716 | (cmd->transport_state & CMD_T_STOP) != 0, | |
1717 | (cmd->transport_state & CMD_T_SENT) != 0); | |
c66ac9db | 1718 | |
c66ac9db NB |
1719 | /* |
1720 | * For SAM Task Attribute emulation for failed struct se_cmd | |
1721 | */ | |
1722 | if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) | |
1723 | transport_complete_task_attr(cmd); | |
1724 | ||
03e98c9e NB |
1725 | switch (cmd->scsi_sense_reason) { |
1726 | case TCM_NON_EXISTENT_LUN: | |
1727 | case TCM_UNSUPPORTED_SCSI_OPCODE: | |
1728 | case TCM_INVALID_CDB_FIELD: | |
1729 | case TCM_INVALID_PARAMETER_LIST: | |
1730 | case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE: | |
1731 | case TCM_UNKNOWN_MODE_PAGE: | |
1732 | case TCM_WRITE_PROTECTED: | |
1733 | case TCM_CHECK_CONDITION_ABORT_CMD: | |
1734 | case TCM_CHECK_CONDITION_UNIT_ATTENTION: | |
1735 | case TCM_CHECK_CONDITION_NOT_READY: | |
c66ac9db | 1736 | break; |
03e98c9e | 1737 | case TCM_RESERVATION_CONFLICT: |
c66ac9db NB |
1738 | /* |
1739 | * No SENSE Data payload for this case, set SCSI Status | |
1740 | * and queue the response to $FABRIC_MOD. | |
1741 | * | |
1742 | * Uses linux/include/scsi/scsi.h SAM status codes defs | |
1743 | */ | |
1744 | cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT; | |
1745 | /* | |
1746 | * For UA Interlock Code 11b, a RESERVATION CONFLICT will | |
1747 | * establish a UNIT ATTENTION with PREVIOUS RESERVATION | |
1748 | * CONFLICT STATUS. | |
1749 | * | |
1750 | * See spc4r17, section 7.4.6 Control Mode Page, Table 349 | |
1751 | */ | |
e3d6f909 AG |
1752 | if (cmd->se_sess && |
1753 | cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2) | |
1754 | core_scsi3_ua_allocate(cmd->se_sess->se_node_acl, | |
c66ac9db NB |
1755 | cmd->orig_fe_lun, 0x2C, |
1756 | ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS); | |
1757 | ||
07bde79a | 1758 | ret = cmd->se_tfo->queue_status(cmd); |
f147abb4 | 1759 | if (ret == -EAGAIN || ret == -ENOMEM) |
07bde79a | 1760 | goto queue_full; |
c66ac9db | 1761 | goto check_stop; |
c66ac9db | 1762 | default: |
6708bb27 | 1763 | pr_err("Unknown transport error for CDB 0x%02x: %d\n", |
03e98c9e | 1764 | cmd->t_task_cdb[0], cmd->scsi_sense_reason); |
c66ac9db NB |
1765 | cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; |
1766 | break; | |
1767 | } | |
f3146437 | 1768 | |
03e98c9e NB |
1769 | ret = transport_send_check_condition_and_sense(cmd, |
1770 | cmd->scsi_sense_reason, 0); | |
1771 | if (ret == -EAGAIN || ret == -ENOMEM) | |
1772 | goto queue_full; | |
07bde79a | 1773 | |
c66ac9db NB |
1774 | check_stop: |
1775 | transport_lun_remove_cmd(cmd); | |
6708bb27 | 1776 | if (!transport_cmd_check_stop_to_fabric(cmd)) |
c66ac9db | 1777 | ; |
07bde79a NB |
1778 | return; |
1779 | ||
1780 | queue_full: | |
e057f533 CH |
1781 | cmd->t_state = TRANSPORT_COMPLETE_QF_OK; |
1782 | transport_handle_queue_full(cmd, cmd->se_dev); | |
c66ac9db | 1783 | } |
2fbff127 | 1784 | EXPORT_SYMBOL(transport_generic_request_failure); |
c66ac9db | 1785 | |
5f41a31d | 1786 | static void __target_execute_cmd(struct se_cmd *cmd) |
c66ac9db | 1787 | { |
0c2ad7d1 | 1788 | int error = 0; |
5f41a31d CH |
1789 | |
1790 | spin_lock_irq(&cmd->t_state_lock); | |
1791 | cmd->transport_state |= (CMD_T_BUSY|CMD_T_SENT); | |
1792 | spin_unlock_irq(&cmd->t_state_lock); | |
1793 | ||
1794 | if (cmd->execute_cmd) | |
1795 | error = cmd->execute_cmd(cmd); | |
5f41a31d CH |
1796 | |
1797 | if (error) { | |
1798 | spin_lock_irq(&cmd->t_state_lock); | |
1799 | cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT); | |
1800 | spin_unlock_irq(&cmd->t_state_lock); | |
1801 | ||
1802 | transport_generic_request_failure(cmd); | |
1803 | } | |
1804 | } | |
1805 | ||
70baf0ab | 1806 | void target_execute_cmd(struct se_cmd *cmd) |
5f41a31d CH |
1807 | { |
1808 | struct se_device *dev = cmd->se_dev; | |
1809 | ||
d59a02b4 CH |
1810 | /* |
1811 | * If the received CDB has aleady been aborted stop processing it here. | |
1812 | */ | |
1813 | if (transport_check_aborted_status(cmd, 1)) | |
1814 | return; | |
1815 | ||
f7113a47 CH |
1816 | /* |
1817 | * Determine if IOCTL context caller in requesting the stopping of this | |
1818 | * command for LUN shutdown purposes. | |
1819 | */ | |
1820 | spin_lock_irq(&cmd->t_state_lock); | |
1821 | if (cmd->transport_state & CMD_T_LUN_STOP) { | |
1822 | pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n", | |
1823 | __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd)); | |
1824 | ||
1825 | cmd->transport_state &= ~CMD_T_ACTIVE; | |
1826 | spin_unlock_irq(&cmd->t_state_lock); | |
1827 | complete(&cmd->transport_lun_stop_comp); | |
1828 | return; | |
1829 | } | |
1830 | /* | |
1831 | * Determine if frontend context caller is requesting the stopping of | |
1832 | * this command for frontend exceptions. | |
1833 | */ | |
1834 | if (cmd->transport_state & CMD_T_STOP) { | |
1835 | pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n", | |
1836 | __func__, __LINE__, | |
1837 | cmd->se_tfo->get_task_tag(cmd)); | |
1838 | ||
1839 | spin_unlock_irq(&cmd->t_state_lock); | |
1840 | complete(&cmd->t_transport_stop_comp); | |
5f41a31d | 1841 | return; |
f7113a47 CH |
1842 | } |
1843 | ||
1844 | cmd->t_state = TRANSPORT_PROCESSING; | |
1845 | spin_unlock_irq(&cmd->t_state_lock); | |
5f41a31d CH |
1846 | |
1847 | if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) | |
1848 | goto execute; | |
1849 | ||
c66ac9db | 1850 | /* |
25985edc | 1851 | * Check for the existence of HEAD_OF_QUEUE, and if true return 1 |
c66ac9db NB |
1852 | * to allow the passed struct se_cmd list of tasks to the front of the list. |
1853 | */ | |
5f41a31d CH |
1854 | switch (cmd->sam_task_attr) { |
1855 | case MSG_HEAD_TAG: | |
1856 | pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, " | |
1857 | "se_ordered_id: %u\n", | |
1858 | cmd->t_task_cdb[0], cmd->se_ordered_id); | |
1859 | goto execute; | |
1860 | case MSG_ORDERED_TAG: | |
1861 | atomic_inc(&dev->dev_ordered_sync); | |
c66ac9db NB |
1862 | smp_mb__after_atomic_inc(); |
1863 | ||
5f41a31d CH |
1864 | pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, " |
1865 | " se_ordered_id: %u\n", | |
1866 | cmd->t_task_cdb[0], cmd->se_ordered_id); | |
1867 | ||
c66ac9db | 1868 | /* |
5f41a31d CH |
1869 | * Execute an ORDERED command if no other older commands |
1870 | * exist that need to be completed first. | |
c66ac9db | 1871 | */ |
5f41a31d CH |
1872 | if (!atomic_read(&dev->simple_cmds)) |
1873 | goto execute; | |
1874 | break; | |
1875 | default: | |
c66ac9db NB |
1876 | /* |
1877 | * For SIMPLE and UNTAGGED Task Attribute commands | |
1878 | */ | |
5f41a31d | 1879 | atomic_inc(&dev->simple_cmds); |
c66ac9db | 1880 | smp_mb__after_atomic_inc(); |
5f41a31d | 1881 | break; |
c66ac9db | 1882 | } |
5f41a31d CH |
1883 | |
1884 | if (atomic_read(&dev->dev_ordered_sync) != 0) { | |
1885 | spin_lock(&dev->delayed_cmd_lock); | |
5f41a31d CH |
1886 | list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list); |
1887 | spin_unlock(&dev->delayed_cmd_lock); | |
c66ac9db | 1888 | |
6708bb27 | 1889 | pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to" |
c66ac9db | 1890 | " delayed CMD list, se_ordered_id: %u\n", |
a1d8b49a | 1891 | cmd->t_task_cdb[0], cmd->sam_task_attr, |
c66ac9db | 1892 | cmd->se_ordered_id); |
5f41a31d | 1893 | return; |
c66ac9db | 1894 | } |
c66ac9db | 1895 | |
5f41a31d | 1896 | execute: |
c66ac9db | 1897 | /* |
5f41a31d | 1898 | * Otherwise, no ORDERED task attributes exist.. |
c66ac9db | 1899 | */ |
5f41a31d | 1900 | __target_execute_cmd(cmd); |
c66ac9db | 1901 | } |
70baf0ab | 1902 | EXPORT_SYMBOL(target_execute_cmd); |
c66ac9db | 1903 | |
c66ac9db NB |
1904 | /* |
1905 | * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd | |
1906 | */ | |
1907 | static int transport_get_sense_data(struct se_cmd *cmd) | |
1908 | { | |
1909 | unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL; | |
42bf829e | 1910 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
1911 | unsigned long flags; |
1912 | u32 offset = 0; | |
1913 | ||
e3d6f909 AG |
1914 | WARN_ON(!cmd->se_lun); |
1915 | ||
42bf829e CH |
1916 | if (!dev) |
1917 | return 0; | |
1918 | ||
a1d8b49a | 1919 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 1920 | if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) { |
a1d8b49a | 1921 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
1922 | return 0; |
1923 | } | |
1924 | ||
cf572a96 CH |
1925 | if (!(cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)) |
1926 | goto out; | |
c66ac9db | 1927 | |
cf572a96 CH |
1928 | if (!dev->transport->get_sense_buffer) { |
1929 | pr_err("dev->transport->get_sense_buffer is NULL\n"); | |
1930 | goto out; | |
1931 | } | |
c66ac9db | 1932 | |
5787cacd | 1933 | sense_buffer = dev->transport->get_sense_buffer(cmd); |
cf572a96 | 1934 | if (!sense_buffer) { |
5787cacd | 1935 | pr_err("ITT 0x%08x cmd %p: Unable to locate" |
cf572a96 | 1936 | " sense buffer for task with sense\n", |
5787cacd | 1937 | cmd->se_tfo->get_task_tag(cmd), cmd); |
cf572a96 | 1938 | goto out; |
c66ac9db | 1939 | } |
5787cacd | 1940 | |
cf572a96 CH |
1941 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
1942 | ||
1943 | offset = cmd->se_tfo->set_fabric_sense_len(cmd, TRANSPORT_SENSE_BUFFER); | |
1944 | ||
1945 | memcpy(&buffer[offset], sense_buffer, TRANSPORT_SENSE_BUFFER); | |
cf572a96 CH |
1946 | |
1947 | /* Automatically padded */ | |
1948 | cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset; | |
1949 | ||
1950 | pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x and sense\n", | |
1951 | dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status); | |
1952 | return 0; | |
1953 | ||
785fdf70 | 1954 | out: |
a1d8b49a | 1955 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
1956 | return -1; |
1957 | } | |
1958 | ||
5f41a31d CH |
1959 | /* |
1960 | * Process all commands up to the last received ORDERED task attribute which | |
1961 | * requires another blocking boundary | |
1962 | */ | |
1963 | static void target_restart_delayed_cmds(struct se_device *dev) | |
1964 | { | |
1965 | for (;;) { | |
1966 | struct se_cmd *cmd; | |
1967 | ||
1968 | spin_lock(&dev->delayed_cmd_lock); | |
1969 | if (list_empty(&dev->delayed_cmd_list)) { | |
1970 | spin_unlock(&dev->delayed_cmd_lock); | |
1971 | break; | |
1972 | } | |
1973 | ||
1974 | cmd = list_entry(dev->delayed_cmd_list.next, | |
1975 | struct se_cmd, se_delayed_node); | |
1976 | list_del(&cmd->se_delayed_node); | |
1977 | spin_unlock(&dev->delayed_cmd_lock); | |
1978 | ||
1979 | __target_execute_cmd(cmd); | |
1980 | ||
1981 | if (cmd->sam_task_attr == MSG_ORDERED_TAG) | |
1982 | break; | |
1983 | } | |
1984 | } | |
1985 | ||
c66ac9db | 1986 | /* |
35e0e757 | 1987 | * Called from I/O completion to determine which dormant/delayed |
c66ac9db NB |
1988 | * and ordered cmds need to have their tasks added to the execution queue. |
1989 | */ | |
1990 | static void transport_complete_task_attr(struct se_cmd *cmd) | |
1991 | { | |
5951146d | 1992 | struct se_device *dev = cmd->se_dev; |
c66ac9db | 1993 | |
e66ecd50 | 1994 | if (cmd->sam_task_attr == MSG_SIMPLE_TAG) { |
c66ac9db NB |
1995 | atomic_dec(&dev->simple_cmds); |
1996 | smp_mb__after_atomic_dec(); | |
1997 | dev->dev_cur_ordered_id++; | |
6708bb27 | 1998 | pr_debug("Incremented dev->dev_cur_ordered_id: %u for" |
c66ac9db NB |
1999 | " SIMPLE: %u\n", dev->dev_cur_ordered_id, |
2000 | cmd->se_ordered_id); | |
e66ecd50 | 2001 | } else if (cmd->sam_task_attr == MSG_HEAD_TAG) { |
c66ac9db | 2002 | dev->dev_cur_ordered_id++; |
6708bb27 | 2003 | pr_debug("Incremented dev_cur_ordered_id: %u for" |
c66ac9db NB |
2004 | " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id, |
2005 | cmd->se_ordered_id); | |
e66ecd50 | 2006 | } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) { |
c66ac9db NB |
2007 | atomic_dec(&dev->dev_ordered_sync); |
2008 | smp_mb__after_atomic_dec(); | |
c66ac9db NB |
2009 | |
2010 | dev->dev_cur_ordered_id++; | |
6708bb27 | 2011 | pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:" |
c66ac9db NB |
2012 | " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id); |
2013 | } | |
c66ac9db | 2014 | |
5f41a31d | 2015 | target_restart_delayed_cmds(dev); |
c66ac9db NB |
2016 | } |
2017 | ||
e057f533 | 2018 | static void transport_complete_qf(struct se_cmd *cmd) |
07bde79a NB |
2019 | { |
2020 | int ret = 0; | |
2021 | ||
e057f533 CH |
2022 | if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) |
2023 | transport_complete_task_attr(cmd); | |
2024 | ||
2025 | if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) { | |
2026 | ret = cmd->se_tfo->queue_status(cmd); | |
2027 | if (ret) | |
2028 | goto out; | |
2029 | } | |
07bde79a NB |
2030 | |
2031 | switch (cmd->data_direction) { | |
2032 | case DMA_FROM_DEVICE: | |
2033 | ret = cmd->se_tfo->queue_data_in(cmd); | |
2034 | break; | |
2035 | case DMA_TO_DEVICE: | |
ec98f782 | 2036 | if (cmd->t_bidi_data_sg) { |
07bde79a NB |
2037 | ret = cmd->se_tfo->queue_data_in(cmd); |
2038 | if (ret < 0) | |
e057f533 | 2039 | break; |
07bde79a NB |
2040 | } |
2041 | /* Fall through for DMA_TO_DEVICE */ | |
2042 | case DMA_NONE: | |
2043 | ret = cmd->se_tfo->queue_status(cmd); | |
2044 | break; | |
2045 | default: | |
2046 | break; | |
2047 | } | |
2048 | ||
e057f533 CH |
2049 | out: |
2050 | if (ret < 0) { | |
2051 | transport_handle_queue_full(cmd, cmd->se_dev); | |
2052 | return; | |
2053 | } | |
2054 | transport_lun_remove_cmd(cmd); | |
2055 | transport_cmd_check_stop_to_fabric(cmd); | |
07bde79a NB |
2056 | } |
2057 | ||
2058 | static void transport_handle_queue_full( | |
2059 | struct se_cmd *cmd, | |
e057f533 | 2060 | struct se_device *dev) |
07bde79a NB |
2061 | { |
2062 | spin_lock_irq(&dev->qf_cmd_lock); | |
07bde79a NB |
2063 | list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list); |
2064 | atomic_inc(&dev->dev_qf_count); | |
2065 | smp_mb__after_atomic_inc(); | |
2066 | spin_unlock_irq(&cmd->se_dev->qf_cmd_lock); | |
2067 | ||
2068 | schedule_work(&cmd->se_dev->qf_work_queue); | |
2069 | } | |
2070 | ||
35e0e757 | 2071 | static void target_complete_ok_work(struct work_struct *work) |
c66ac9db | 2072 | { |
35e0e757 | 2073 | struct se_cmd *cmd = container_of(work, struct se_cmd, work); |
07bde79a | 2074 | int reason = 0, ret; |
35e0e757 | 2075 | |
c66ac9db NB |
2076 | /* |
2077 | * Check if we need to move delayed/dormant tasks from cmds on the | |
2078 | * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task | |
2079 | * Attribute. | |
2080 | */ | |
5951146d | 2081 | if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) |
c66ac9db | 2082 | transport_complete_task_attr(cmd); |
07bde79a NB |
2083 | /* |
2084 | * Check to schedule QUEUE_FULL work, or execute an existing | |
2085 | * cmd->transport_qf_callback() | |
2086 | */ | |
2087 | if (atomic_read(&cmd->se_dev->dev_qf_count) != 0) | |
2088 | schedule_work(&cmd->se_dev->qf_work_queue); | |
2089 | ||
c66ac9db NB |
2090 | /* |
2091 | * Check if we need to retrieve a sense buffer from | |
2092 | * the struct se_cmd in question. | |
2093 | */ | |
2094 | if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) { | |
2095 | if (transport_get_sense_data(cmd) < 0) | |
2096 | reason = TCM_NON_EXISTENT_LUN; | |
2097 | ||
c66ac9db | 2098 | if (cmd->scsi_status) { |
07bde79a | 2099 | ret = transport_send_check_condition_and_sense( |
c66ac9db | 2100 | cmd, reason, 1); |
f147abb4 | 2101 | if (ret == -EAGAIN || ret == -ENOMEM) |
07bde79a NB |
2102 | goto queue_full; |
2103 | ||
c66ac9db NB |
2104 | transport_lun_remove_cmd(cmd); |
2105 | transport_cmd_check_stop_to_fabric(cmd); | |
2106 | return; | |
2107 | } | |
2108 | } | |
2109 | /* | |
25985edc | 2110 | * Check for a callback, used by amongst other things |
c66ac9db NB |
2111 | * XDWRITE_READ_10 emulation. |
2112 | */ | |
2113 | if (cmd->transport_complete_callback) | |
2114 | cmd->transport_complete_callback(cmd); | |
2115 | ||
2116 | switch (cmd->data_direction) { | |
2117 | case DMA_FROM_DEVICE: | |
2118 | spin_lock(&cmd->se_lun->lun_sep_lock); | |
e3d6f909 AG |
2119 | if (cmd->se_lun->lun_sep) { |
2120 | cmd->se_lun->lun_sep->sep_stats.tx_data_octets += | |
c66ac9db NB |
2121 | cmd->data_length; |
2122 | } | |
2123 | spin_unlock(&cmd->se_lun->lun_sep_lock); | |
c66ac9db | 2124 | |
07bde79a | 2125 | ret = cmd->se_tfo->queue_data_in(cmd); |
f147abb4 | 2126 | if (ret == -EAGAIN || ret == -ENOMEM) |
07bde79a | 2127 | goto queue_full; |
c66ac9db NB |
2128 | break; |
2129 | case DMA_TO_DEVICE: | |
2130 | spin_lock(&cmd->se_lun->lun_sep_lock); | |
e3d6f909 AG |
2131 | if (cmd->se_lun->lun_sep) { |
2132 | cmd->se_lun->lun_sep->sep_stats.rx_data_octets += | |
c66ac9db NB |
2133 | cmd->data_length; |
2134 | } | |
2135 | spin_unlock(&cmd->se_lun->lun_sep_lock); | |
2136 | /* | |
2137 | * Check if we need to send READ payload for BIDI-COMMAND | |
2138 | */ | |
ec98f782 | 2139 | if (cmd->t_bidi_data_sg) { |
c66ac9db | 2140 | spin_lock(&cmd->se_lun->lun_sep_lock); |
e3d6f909 AG |
2141 | if (cmd->se_lun->lun_sep) { |
2142 | cmd->se_lun->lun_sep->sep_stats.tx_data_octets += | |
c66ac9db NB |
2143 | cmd->data_length; |
2144 | } | |
2145 | spin_unlock(&cmd->se_lun->lun_sep_lock); | |
07bde79a | 2146 | ret = cmd->se_tfo->queue_data_in(cmd); |
f147abb4 | 2147 | if (ret == -EAGAIN || ret == -ENOMEM) |
07bde79a | 2148 | goto queue_full; |
c66ac9db NB |
2149 | break; |
2150 | } | |
2151 | /* Fall through for DMA_TO_DEVICE */ | |
2152 | case DMA_NONE: | |
07bde79a | 2153 | ret = cmd->se_tfo->queue_status(cmd); |
f147abb4 | 2154 | if (ret == -EAGAIN || ret == -ENOMEM) |
07bde79a | 2155 | goto queue_full; |
c66ac9db NB |
2156 | break; |
2157 | default: | |
2158 | break; | |
2159 | } | |
2160 | ||
2161 | transport_lun_remove_cmd(cmd); | |
2162 | transport_cmd_check_stop_to_fabric(cmd); | |
07bde79a NB |
2163 | return; |
2164 | ||
2165 | queue_full: | |
6708bb27 | 2166 | pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p," |
07bde79a | 2167 | " data_direction: %d\n", cmd, cmd->data_direction); |
e057f533 CH |
2168 | cmd->t_state = TRANSPORT_COMPLETE_QF_OK; |
2169 | transport_handle_queue_full(cmd, cmd->se_dev); | |
c66ac9db NB |
2170 | } |
2171 | ||
6708bb27 | 2172 | static inline void transport_free_sgl(struct scatterlist *sgl, int nents) |
c66ac9db | 2173 | { |
ec98f782 | 2174 | struct scatterlist *sg; |
ec98f782 | 2175 | int count; |
c66ac9db | 2176 | |
6708bb27 AG |
2177 | for_each_sg(sgl, sg, nents, count) |
2178 | __free_page(sg_page(sg)); | |
c66ac9db | 2179 | |
6708bb27 AG |
2180 | kfree(sgl); |
2181 | } | |
c66ac9db | 2182 | |
6708bb27 AG |
2183 | static inline void transport_free_pages(struct se_cmd *cmd) |
2184 | { | |
2185 | if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) | |
2186 | return; | |
2187 | ||
2188 | transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents); | |
ec98f782 AG |
2189 | cmd->t_data_sg = NULL; |
2190 | cmd->t_data_nents = 0; | |
c66ac9db | 2191 | |
6708bb27 | 2192 | transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents); |
ec98f782 AG |
2193 | cmd->t_bidi_data_sg = NULL; |
2194 | cmd->t_bidi_data_nents = 0; | |
c66ac9db NB |
2195 | } |
2196 | ||
e26d99ae CH |
2197 | /** |
2198 | * transport_release_cmd - free a command | |
2199 | * @cmd: command to free | |
2200 | * | |
2201 | * This routine unconditionally frees a command, and reference counting | |
2202 | * or list removal must be done in the caller. | |
2203 | */ | |
2204 | static void transport_release_cmd(struct se_cmd *cmd) | |
2205 | { | |
2206 | BUG_ON(!cmd->se_tfo); | |
2207 | ||
c8e31f26 | 2208 | if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB) |
e26d99ae CH |
2209 | core_tmr_release_req(cmd->se_tmr_req); |
2210 | if (cmd->t_task_cdb != cmd->__t_task_cdb) | |
2211 | kfree(cmd->t_task_cdb); | |
2212 | /* | |
7481deb4 NB |
2213 | * If this cmd has been setup with target_get_sess_cmd(), drop |
2214 | * the kref and call ->release_cmd() in kref callback. | |
e26d99ae | 2215 | */ |
7481deb4 NB |
2216 | if (cmd->check_release != 0) { |
2217 | target_put_sess_cmd(cmd->se_sess, cmd); | |
2218 | return; | |
2219 | } | |
e26d99ae CH |
2220 | cmd->se_tfo->release_cmd(cmd); |
2221 | } | |
2222 | ||
d3df7825 CH |
2223 | /** |
2224 | * transport_put_cmd - release a reference to a command | |
2225 | * @cmd: command to release | |
2226 | * | |
2227 | * This routine releases our reference to the command and frees it if possible. | |
2228 | */ | |
39c05f32 | 2229 | static void transport_put_cmd(struct se_cmd *cmd) |
c66ac9db NB |
2230 | { |
2231 | unsigned long flags; | |
c66ac9db | 2232 | |
a1d8b49a | 2233 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
4911e3cc CH |
2234 | if (atomic_read(&cmd->t_fe_count)) { |
2235 | if (!atomic_dec_and_test(&cmd->t_fe_count)) | |
2236 | goto out_busy; | |
2237 | } | |
2238 | ||
7d680f3b CH |
2239 | if (cmd->transport_state & CMD_T_DEV_ACTIVE) { |
2240 | cmd->transport_state &= ~CMD_T_DEV_ACTIVE; | |
cf572a96 | 2241 | target_remove_from_state_list(cmd); |
c66ac9db | 2242 | } |
a1d8b49a | 2243 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 2244 | |
c66ac9db | 2245 | transport_free_pages(cmd); |
31afc39c | 2246 | transport_release_cmd(cmd); |
39c05f32 | 2247 | return; |
4911e3cc CH |
2248 | out_busy: |
2249 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
c66ac9db NB |
2250 | } |
2251 | ||
c66ac9db | 2252 | /* |
ec98f782 AG |
2253 | * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of |
2254 | * allocating in the core. | |
c66ac9db NB |
2255 | * @cmd: Associated se_cmd descriptor |
2256 | * @mem: SGL style memory for TCM WRITE / READ | |
2257 | * @sg_mem_num: Number of SGL elements | |
2258 | * @mem_bidi_in: SGL style memory for TCM BIDI READ | |
2259 | * @sg_mem_bidi_num: Number of BIDI READ SGL elements | |
2260 | * | |
2261 | * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage | |
2262 | * of parameters. | |
2263 | */ | |
2264 | int transport_generic_map_mem_to_cmd( | |
2265 | struct se_cmd *cmd, | |
5951146d AG |
2266 | struct scatterlist *sgl, |
2267 | u32 sgl_count, | |
2268 | struct scatterlist *sgl_bidi, | |
2269 | u32 sgl_bidi_count) | |
c66ac9db | 2270 | { |
5951146d | 2271 | if (!sgl || !sgl_count) |
c66ac9db | 2272 | return 0; |
c66ac9db | 2273 | |
64f1db38 CH |
2274 | /* |
2275 | * Reject SCSI data overflow with map_mem_to_cmd() as incoming | |
2276 | * scatterlists already have been set to follow what the fabric | |
2277 | * passes for the original expected data transfer length. | |
2278 | */ | |
2279 | if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) { | |
2280 | pr_warn("Rejecting SCSI DATA overflow for fabric using" | |
2281 | " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n"); | |
2282 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
2283 | cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; | |
2284 | return -EINVAL; | |
2285 | } | |
c66ac9db | 2286 | |
64f1db38 CH |
2287 | cmd->t_data_sg = sgl; |
2288 | cmd->t_data_nents = sgl_count; | |
c66ac9db | 2289 | |
64f1db38 CH |
2290 | if (sgl_bidi && sgl_bidi_count) { |
2291 | cmd->t_bidi_data_sg = sgl_bidi; | |
2292 | cmd->t_bidi_data_nents = sgl_bidi_count; | |
c66ac9db | 2293 | } |
64f1db38 | 2294 | cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC; |
c66ac9db NB |
2295 | return 0; |
2296 | } | |
2297 | EXPORT_SYMBOL(transport_generic_map_mem_to_cmd); | |
2298 | ||
4949314c | 2299 | void *transport_kmap_data_sg(struct se_cmd *cmd) |
05d1c7c0 | 2300 | { |
ec98f782 | 2301 | struct scatterlist *sg = cmd->t_data_sg; |
4949314c AG |
2302 | struct page **pages; |
2303 | int i; | |
05d1c7c0 | 2304 | |
ec98f782 | 2305 | BUG_ON(!sg); |
05d1c7c0 | 2306 | /* |
ec98f782 AG |
2307 | * We need to take into account a possible offset here for fabrics like |
2308 | * tcm_loop who may be using a contig buffer from the SCSI midlayer for | |
2309 | * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd() | |
05d1c7c0 | 2310 | */ |
4949314c AG |
2311 | if (!cmd->t_data_nents) |
2312 | return NULL; | |
2313 | else if (cmd->t_data_nents == 1) | |
2314 | return kmap(sg_page(sg)) + sg->offset; | |
2315 | ||
2316 | /* >1 page. use vmap */ | |
2317 | pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL); | |
2318 | if (!pages) | |
2319 | return NULL; | |
2320 | ||
2321 | /* convert sg[] to pages[] */ | |
2322 | for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) { | |
2323 | pages[i] = sg_page(sg); | |
2324 | } | |
2325 | ||
2326 | cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL); | |
2327 | kfree(pages); | |
2328 | if (!cmd->t_data_vmap) | |
2329 | return NULL; | |
2330 | ||
2331 | return cmd->t_data_vmap + cmd->t_data_sg[0].offset; | |
05d1c7c0 | 2332 | } |
4949314c | 2333 | EXPORT_SYMBOL(transport_kmap_data_sg); |
05d1c7c0 | 2334 | |
4949314c | 2335 | void transport_kunmap_data_sg(struct se_cmd *cmd) |
05d1c7c0 | 2336 | { |
a1edf9cf | 2337 | if (!cmd->t_data_nents) { |
4949314c | 2338 | return; |
a1edf9cf | 2339 | } else if (cmd->t_data_nents == 1) { |
4949314c | 2340 | kunmap(sg_page(cmd->t_data_sg)); |
a1edf9cf AG |
2341 | return; |
2342 | } | |
4949314c AG |
2343 | |
2344 | vunmap(cmd->t_data_vmap); | |
2345 | cmd->t_data_vmap = NULL; | |
05d1c7c0 | 2346 | } |
4949314c | 2347 | EXPORT_SYMBOL(transport_kunmap_data_sg); |
05d1c7c0 | 2348 | |
c66ac9db | 2349 | static int |
05d1c7c0 | 2350 | transport_generic_get_mem(struct se_cmd *cmd) |
c66ac9db | 2351 | { |
ec98f782 AG |
2352 | u32 length = cmd->data_length; |
2353 | unsigned int nents; | |
2354 | struct page *page; | |
9db9da33 | 2355 | gfp_t zero_flag; |
ec98f782 | 2356 | int i = 0; |
c66ac9db | 2357 | |
ec98f782 AG |
2358 | nents = DIV_ROUND_UP(length, PAGE_SIZE); |
2359 | cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL); | |
2360 | if (!cmd->t_data_sg) | |
2361 | return -ENOMEM; | |
c66ac9db | 2362 | |
ec98f782 AG |
2363 | cmd->t_data_nents = nents; |
2364 | sg_init_table(cmd->t_data_sg, nents); | |
c66ac9db | 2365 | |
64f1db38 | 2366 | zero_flag = cmd->se_cmd_flags & SCF_SCSI_DATA_CDB ? 0 : __GFP_ZERO; |
9db9da33 | 2367 | |
ec98f782 AG |
2368 | while (length) { |
2369 | u32 page_len = min_t(u32, length, PAGE_SIZE); | |
9db9da33 | 2370 | page = alloc_page(GFP_KERNEL | zero_flag); |
ec98f782 AG |
2371 | if (!page) |
2372 | goto out; | |
c66ac9db | 2373 | |
ec98f782 AG |
2374 | sg_set_page(&cmd->t_data_sg[i], page, page_len, 0); |
2375 | length -= page_len; | |
2376 | i++; | |
c66ac9db | 2377 | } |
c66ac9db | 2378 | return 0; |
c66ac9db | 2379 | |
ec98f782 AG |
2380 | out: |
2381 | while (i >= 0) { | |
2382 | __free_page(sg_page(&cmd->t_data_sg[i])); | |
2383 | i--; | |
c66ac9db | 2384 | } |
ec98f782 AG |
2385 | kfree(cmd->t_data_sg); |
2386 | cmd->t_data_sg = NULL; | |
2387 | return -ENOMEM; | |
c66ac9db NB |
2388 | } |
2389 | ||
da0f7619 | 2390 | /* |
b16a35b0 AG |
2391 | * Allocate any required resources to execute the command. For writes we |
2392 | * might not have the payload yet, so notify the fabric via a call to | |
2393 | * ->write_pending instead. Otherwise place it on the execution queue. | |
c66ac9db | 2394 | */ |
a1d8b49a | 2395 | int transport_generic_new_cmd(struct se_cmd *cmd) |
c66ac9db | 2396 | { |
c66ac9db NB |
2397 | int ret = 0; |
2398 | ||
2399 | /* | |
2400 | * Determine is the TCM fabric module has already allocated physical | |
2401 | * memory, and is directly calling transport_generic_map_mem_to_cmd() | |
ec98f782 | 2402 | * beforehand. |
c66ac9db | 2403 | */ |
ec98f782 AG |
2404 | if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) && |
2405 | cmd->data_length) { | |
05d1c7c0 | 2406 | ret = transport_generic_get_mem(cmd); |
c66ac9db | 2407 | if (ret < 0) |
03e98c9e | 2408 | goto out_fail; |
c66ac9db | 2409 | } |
da0f7619 | 2410 | |
4101f0a8 | 2411 | /* Workaround for handling zero-length control CDBs */ |
64f1db38 | 2412 | if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) && !cmd->data_length) { |
7d680f3b | 2413 | spin_lock_irq(&cmd->t_state_lock); |
410f6702 | 2414 | cmd->t_state = TRANSPORT_COMPLETE; |
7d680f3b CH |
2415 | cmd->transport_state |= CMD_T_ACTIVE; |
2416 | spin_unlock_irq(&cmd->t_state_lock); | |
91ec1d35 NB |
2417 | |
2418 | if (cmd->t_task_cdb[0] == REQUEST_SENSE) { | |
2419 | u8 ua_asc = 0, ua_ascq = 0; | |
2420 | ||
2421 | core_scsi3_ua_clear_for_request_sense(cmd, | |
2422 | &ua_asc, &ua_ascq); | |
2423 | } | |
2424 | ||
410f6702 RD |
2425 | INIT_WORK(&cmd->work, target_complete_ok_work); |
2426 | queue_work(target_completion_wq, &cmd->work); | |
2427 | return 0; | |
2428 | } | |
da0f7619 | 2429 | |
4101f0a8 | 2430 | atomic_inc(&cmd->t_fe_count); |
4101f0a8 | 2431 | |
c66ac9db | 2432 | /* |
c3196f0c CH |
2433 | * If this command is not a write we can execute it right here, |
2434 | * for write buffers we need to notify the fabric driver first | |
2435 | * and let it call back once the write buffers are ready. | |
c66ac9db | 2436 | */ |
5f41a31d | 2437 | target_add_to_state_list(cmd); |
c3196f0c CH |
2438 | if (cmd->data_direction != DMA_TO_DEVICE) { |
2439 | target_execute_cmd(cmd); | |
2440 | return 0; | |
2441 | } | |
2442 | ||
2443 | spin_lock_irq(&cmd->t_state_lock); | |
2444 | cmd->t_state = TRANSPORT_WRITE_PENDING; | |
2445 | spin_unlock_irq(&cmd->t_state_lock); | |
2446 | ||
2447 | transport_cmd_check_stop(cmd, false); | |
2448 | ||
2449 | ret = cmd->se_tfo->write_pending(cmd); | |
2450 | if (ret == -EAGAIN || ret == -ENOMEM) | |
2451 | goto queue_full; | |
2452 | ||
2453 | if (ret < 0) | |
2454 | return ret; | |
2455 | return 1; | |
da0f7619 CH |
2456 | |
2457 | out_fail: | |
2458 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
2459 | cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
2460 | return -EINVAL; | |
c3196f0c CH |
2461 | queue_full: |
2462 | pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd); | |
2463 | cmd->t_state = TRANSPORT_COMPLETE_QF_WP; | |
2464 | transport_handle_queue_full(cmd, cmd->se_dev); | |
2465 | return 0; | |
c66ac9db | 2466 | } |
a1d8b49a | 2467 | EXPORT_SYMBOL(transport_generic_new_cmd); |
c66ac9db | 2468 | |
e057f533 | 2469 | static void transport_write_pending_qf(struct se_cmd *cmd) |
07bde79a | 2470 | { |
f147abb4 NB |
2471 | int ret; |
2472 | ||
2473 | ret = cmd->se_tfo->write_pending(cmd); | |
2474 | if (ret == -EAGAIN || ret == -ENOMEM) { | |
e057f533 CH |
2475 | pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", |
2476 | cmd); | |
2477 | transport_handle_queue_full(cmd, cmd->se_dev); | |
2478 | } | |
07bde79a NB |
2479 | } |
2480 | ||
39c05f32 | 2481 | void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks) |
c66ac9db | 2482 | { |
d14921d6 | 2483 | if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) { |
c8e31f26 | 2484 | if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) |
d14921d6 NB |
2485 | transport_wait_for_tasks(cmd); |
2486 | ||
35462975 | 2487 | transport_release_cmd(cmd); |
d14921d6 NB |
2488 | } else { |
2489 | if (wait_for_tasks) | |
2490 | transport_wait_for_tasks(cmd); | |
2491 | ||
c66ac9db NB |
2492 | core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd); |
2493 | ||
82f1c8a4 | 2494 | if (cmd->se_lun) |
c66ac9db | 2495 | transport_lun_remove_cmd(cmd); |
c66ac9db | 2496 | |
39c05f32 | 2497 | transport_put_cmd(cmd); |
c66ac9db NB |
2498 | } |
2499 | } | |
2500 | EXPORT_SYMBOL(transport_generic_free_cmd); | |
2501 | ||
a17f091d NB |
2502 | /* target_get_sess_cmd - Add command to active ->sess_cmd_list |
2503 | * @se_sess: session to reference | |
2504 | * @se_cmd: command descriptor to add | |
a6360785 | 2505 | * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd() |
a17f091d | 2506 | */ |
a6360785 NB |
2507 | void target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd, |
2508 | bool ack_kref) | |
a17f091d NB |
2509 | { |
2510 | unsigned long flags; | |
2511 | ||
7481deb4 | 2512 | kref_init(&se_cmd->cmd_kref); |
a6360785 NB |
2513 | /* |
2514 | * Add a second kref if the fabric caller is expecting to handle | |
2515 | * fabric acknowledgement that requires two target_put_sess_cmd() | |
2516 | * invocations before se_cmd descriptor release. | |
2517 | */ | |
86715569 | 2518 | if (ack_kref == true) { |
a6360785 | 2519 | kref_get(&se_cmd->cmd_kref); |
86715569 NB |
2520 | se_cmd->se_cmd_flags |= SCF_ACK_KREF; |
2521 | } | |
7481deb4 | 2522 | |
a17f091d NB |
2523 | spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); |
2524 | list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list); | |
2525 | se_cmd->check_release = 1; | |
2526 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); | |
2527 | } | |
2528 | EXPORT_SYMBOL(target_get_sess_cmd); | |
2529 | ||
7481deb4 | 2530 | static void target_release_cmd_kref(struct kref *kref) |
a17f091d | 2531 | { |
7481deb4 NB |
2532 | struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref); |
2533 | struct se_session *se_sess = se_cmd->se_sess; | |
a17f091d NB |
2534 | unsigned long flags; |
2535 | ||
2536 | spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); | |
2537 | if (list_empty(&se_cmd->se_cmd_list)) { | |
2538 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); | |
ffc32d52 | 2539 | se_cmd->se_tfo->release_cmd(se_cmd); |
7481deb4 | 2540 | return; |
a17f091d | 2541 | } |
a17f091d NB |
2542 | if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) { |
2543 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); | |
2544 | complete(&se_cmd->cmd_wait_comp); | |
7481deb4 | 2545 | return; |
a17f091d NB |
2546 | } |
2547 | list_del(&se_cmd->se_cmd_list); | |
2548 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); | |
2549 | ||
7481deb4 NB |
2550 | se_cmd->se_tfo->release_cmd(se_cmd); |
2551 | } | |
2552 | ||
2553 | /* target_put_sess_cmd - Check for active I/O shutdown via kref_put | |
2554 | * @se_sess: session to reference | |
2555 | * @se_cmd: command descriptor to drop | |
2556 | */ | |
2557 | int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd) | |
2558 | { | |
2559 | return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref); | |
a17f091d NB |
2560 | } |
2561 | EXPORT_SYMBOL(target_put_sess_cmd); | |
2562 | ||
2563 | /* target_splice_sess_cmd_list - Split active cmds into sess_wait_list | |
2564 | * @se_sess: session to split | |
2565 | */ | |
2566 | void target_splice_sess_cmd_list(struct se_session *se_sess) | |
2567 | { | |
2568 | struct se_cmd *se_cmd; | |
2569 | unsigned long flags; | |
2570 | ||
2571 | WARN_ON(!list_empty(&se_sess->sess_wait_list)); | |
2572 | INIT_LIST_HEAD(&se_sess->sess_wait_list); | |
2573 | ||
2574 | spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); | |
2575 | se_sess->sess_tearing_down = 1; | |
2576 | ||
2577 | list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list); | |
2578 | ||
2579 | list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list) | |
2580 | se_cmd->cmd_wait_set = 1; | |
2581 | ||
2582 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); | |
2583 | } | |
2584 | EXPORT_SYMBOL(target_splice_sess_cmd_list); | |
2585 | ||
2586 | /* target_wait_for_sess_cmds - Wait for outstanding descriptors | |
2587 | * @se_sess: session to wait for active I/O | |
2588 | * @wait_for_tasks: Make extra transport_wait_for_tasks call | |
2589 | */ | |
2590 | void target_wait_for_sess_cmds( | |
2591 | struct se_session *se_sess, | |
2592 | int wait_for_tasks) | |
2593 | { | |
2594 | struct se_cmd *se_cmd, *tmp_cmd; | |
2595 | bool rc = false; | |
2596 | ||
2597 | list_for_each_entry_safe(se_cmd, tmp_cmd, | |
2598 | &se_sess->sess_wait_list, se_cmd_list) { | |
2599 | list_del(&se_cmd->se_cmd_list); | |
2600 | ||
2601 | pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:" | |
2602 | " %d\n", se_cmd, se_cmd->t_state, | |
2603 | se_cmd->se_tfo->get_cmd_state(se_cmd)); | |
2604 | ||
2605 | if (wait_for_tasks) { | |
2606 | pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d," | |
2607 | " fabric state: %d\n", se_cmd, se_cmd->t_state, | |
2608 | se_cmd->se_tfo->get_cmd_state(se_cmd)); | |
2609 | ||
2610 | rc = transport_wait_for_tasks(se_cmd); | |
2611 | ||
2612 | pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d," | |
2613 | " fabric state: %d\n", se_cmd, se_cmd->t_state, | |
2614 | se_cmd->se_tfo->get_cmd_state(se_cmd)); | |
2615 | } | |
2616 | ||
2617 | if (!rc) { | |
2618 | wait_for_completion(&se_cmd->cmd_wait_comp); | |
2619 | pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d" | |
2620 | " fabric state: %d\n", se_cmd, se_cmd->t_state, | |
2621 | se_cmd->se_tfo->get_cmd_state(se_cmd)); | |
2622 | } | |
2623 | ||
2624 | se_cmd->se_tfo->release_cmd(se_cmd); | |
2625 | } | |
2626 | } | |
2627 | EXPORT_SYMBOL(target_wait_for_sess_cmds); | |
2628 | ||
c66ac9db NB |
2629 | /* transport_lun_wait_for_tasks(): |
2630 | * | |
2631 | * Called from ConfigFS context to stop the passed struct se_cmd to allow | |
2632 | * an struct se_lun to be successfully shutdown. | |
2633 | */ | |
2634 | static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun) | |
2635 | { | |
2636 | unsigned long flags; | |
cf572a96 CH |
2637 | int ret = 0; |
2638 | ||
c66ac9db NB |
2639 | /* |
2640 | * If the frontend has already requested this struct se_cmd to | |
2641 | * be stopped, we can safely ignore this struct se_cmd. | |
2642 | */ | |
a1d8b49a | 2643 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
7d680f3b CH |
2644 | if (cmd->transport_state & CMD_T_STOP) { |
2645 | cmd->transport_state &= ~CMD_T_LUN_STOP; | |
2646 | ||
2647 | pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n", | |
2648 | cmd->se_tfo->get_task_tag(cmd)); | |
a1d8b49a | 2649 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
f7113a47 | 2650 | transport_cmd_check_stop(cmd, false); |
e3d6f909 | 2651 | return -EPERM; |
c66ac9db | 2652 | } |
7d680f3b | 2653 | cmd->transport_state |= CMD_T_LUN_FE_STOP; |
a1d8b49a | 2654 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 2655 | |
5951146d | 2656 | wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq); |
c66ac9db | 2657 | |
cf572a96 CH |
2658 | // XXX: audit task_flags checks. |
2659 | spin_lock_irqsave(&cmd->t_state_lock, flags); | |
2660 | if ((cmd->transport_state & CMD_T_BUSY) && | |
2661 | (cmd->transport_state & CMD_T_SENT)) { | |
2662 | if (!target_stop_cmd(cmd, &flags)) | |
2663 | ret++; | |
cf572a96 | 2664 | } |
5f41a31d | 2665 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 2666 | |
785fdf70 CH |
2667 | pr_debug("ConfigFS: cmd: %p stop tasks ret:" |
2668 | " %d\n", cmd, ret); | |
c66ac9db | 2669 | if (!ret) { |
6708bb27 | 2670 | pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n", |
e3d6f909 | 2671 | cmd->se_tfo->get_task_tag(cmd)); |
a1d8b49a | 2672 | wait_for_completion(&cmd->transport_lun_stop_comp); |
6708bb27 | 2673 | pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n", |
e3d6f909 | 2674 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 2675 | } |
3df8d40b | 2676 | transport_remove_cmd_from_queue(cmd); |
c66ac9db NB |
2677 | |
2678 | return 0; | |
2679 | } | |
2680 | ||
c66ac9db NB |
2681 | static void __transport_clear_lun_from_sessions(struct se_lun *lun) |
2682 | { | |
2683 | struct se_cmd *cmd = NULL; | |
2684 | unsigned long lun_flags, cmd_flags; | |
2685 | /* | |
2686 | * Do exception processing and return CHECK_CONDITION status to the | |
2687 | * Initiator Port. | |
2688 | */ | |
2689 | spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags); | |
5951146d AG |
2690 | while (!list_empty(&lun->lun_cmd_list)) { |
2691 | cmd = list_first_entry(&lun->lun_cmd_list, | |
2692 | struct se_cmd, se_lun_node); | |
3d26fea0 | 2693 | list_del_init(&cmd->se_lun_node); |
5951146d | 2694 | |
a1d8b49a | 2695 | spin_lock(&cmd->t_state_lock); |
6708bb27 | 2696 | pr_debug("SE_LUN[%d] - Setting cmd->transport" |
c66ac9db | 2697 | "_lun_stop for ITT: 0x%08x\n", |
e3d6f909 AG |
2698 | cmd->se_lun->unpacked_lun, |
2699 | cmd->se_tfo->get_task_tag(cmd)); | |
7d680f3b | 2700 | cmd->transport_state |= CMD_T_LUN_STOP; |
a1d8b49a | 2701 | spin_unlock(&cmd->t_state_lock); |
c66ac9db NB |
2702 | |
2703 | spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags); | |
2704 | ||
6708bb27 AG |
2705 | if (!cmd->se_lun) { |
2706 | pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n", | |
e3d6f909 AG |
2707 | cmd->se_tfo->get_task_tag(cmd), |
2708 | cmd->se_tfo->get_cmd_state(cmd), cmd->t_state); | |
c66ac9db NB |
2709 | BUG(); |
2710 | } | |
2711 | /* | |
2712 | * If the Storage engine still owns the iscsi_cmd_t, determine | |
2713 | * and/or stop its context. | |
2714 | */ | |
6708bb27 | 2715 | pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport" |
e3d6f909 AG |
2716 | "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun, |
2717 | cmd->se_tfo->get_task_tag(cmd)); | |
c66ac9db | 2718 | |
e3d6f909 | 2719 | if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) { |
c66ac9db NB |
2720 | spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags); |
2721 | continue; | |
2722 | } | |
2723 | ||
6708bb27 | 2724 | pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun" |
c66ac9db | 2725 | "_wait_for_tasks(): SUCCESS\n", |
e3d6f909 AG |
2726 | cmd->se_lun->unpacked_lun, |
2727 | cmd->se_tfo->get_task_tag(cmd)); | |
c66ac9db | 2728 | |
a1d8b49a | 2729 | spin_lock_irqsave(&cmd->t_state_lock, cmd_flags); |
7d680f3b | 2730 | if (!(cmd->transport_state & CMD_T_DEV_ACTIVE)) { |
a1d8b49a | 2731 | spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags); |
c66ac9db NB |
2732 | goto check_cond; |
2733 | } | |
7d680f3b | 2734 | cmd->transport_state &= ~CMD_T_DEV_ACTIVE; |
cf572a96 | 2735 | target_remove_from_state_list(cmd); |
a1d8b49a | 2736 | spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags); |
c66ac9db | 2737 | |
c66ac9db NB |
2738 | /* |
2739 | * The Storage engine stopped this struct se_cmd before it was | |
2740 | * send to the fabric frontend for delivery back to the | |
2741 | * Initiator Node. Return this SCSI CDB back with an | |
2742 | * CHECK_CONDITION status. | |
2743 | */ | |
2744 | check_cond: | |
2745 | transport_send_check_condition_and_sense(cmd, | |
2746 | TCM_NON_EXISTENT_LUN, 0); | |
2747 | /* | |
2748 | * If the fabric frontend is waiting for this iscsi_cmd_t to | |
2749 | * be released, notify the waiting thread now that LU has | |
2750 | * finished accessing it. | |
2751 | */ | |
a1d8b49a | 2752 | spin_lock_irqsave(&cmd->t_state_lock, cmd_flags); |
7d680f3b | 2753 | if (cmd->transport_state & CMD_T_LUN_FE_STOP) { |
6708bb27 | 2754 | pr_debug("SE_LUN[%d] - Detected FE stop for" |
c66ac9db NB |
2755 | " struct se_cmd: %p ITT: 0x%08x\n", |
2756 | lun->unpacked_lun, | |
e3d6f909 | 2757 | cmd, cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 2758 | |
a1d8b49a | 2759 | spin_unlock_irqrestore(&cmd->t_state_lock, |
c66ac9db | 2760 | cmd_flags); |
f7113a47 | 2761 | transport_cmd_check_stop(cmd, false); |
a1d8b49a | 2762 | complete(&cmd->transport_lun_fe_stop_comp); |
c66ac9db NB |
2763 | spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags); |
2764 | continue; | |
2765 | } | |
6708bb27 | 2766 | pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n", |
e3d6f909 | 2767 | lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 2768 | |
a1d8b49a | 2769 | spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags); |
c66ac9db NB |
2770 | spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags); |
2771 | } | |
2772 | spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags); | |
2773 | } | |
2774 | ||
2775 | static int transport_clear_lun_thread(void *p) | |
2776 | { | |
8359cf43 | 2777 | struct se_lun *lun = p; |
c66ac9db NB |
2778 | |
2779 | __transport_clear_lun_from_sessions(lun); | |
2780 | complete(&lun->lun_shutdown_comp); | |
2781 | ||
2782 | return 0; | |
2783 | } | |
2784 | ||
2785 | int transport_clear_lun_from_sessions(struct se_lun *lun) | |
2786 | { | |
2787 | struct task_struct *kt; | |
2788 | ||
5951146d | 2789 | kt = kthread_run(transport_clear_lun_thread, lun, |
c66ac9db NB |
2790 | "tcm_cl_%u", lun->unpacked_lun); |
2791 | if (IS_ERR(kt)) { | |
6708bb27 | 2792 | pr_err("Unable to start clear_lun thread\n"); |
e3d6f909 | 2793 | return PTR_ERR(kt); |
c66ac9db NB |
2794 | } |
2795 | wait_for_completion(&lun->lun_shutdown_comp); | |
2796 | ||
2797 | return 0; | |
2798 | } | |
2799 | ||
d14921d6 NB |
2800 | /** |
2801 | * transport_wait_for_tasks - wait for completion to occur | |
2802 | * @cmd: command to wait | |
c66ac9db | 2803 | * |
d14921d6 NB |
2804 | * Called from frontend fabric context to wait for storage engine |
2805 | * to pause and/or release frontend generated struct se_cmd. | |
c66ac9db | 2806 | */ |
a17f091d | 2807 | bool transport_wait_for_tasks(struct se_cmd *cmd) |
c66ac9db NB |
2808 | { |
2809 | unsigned long flags; | |
2810 | ||
a1d8b49a | 2811 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c8e31f26 AG |
2812 | if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && |
2813 | !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) { | |
d14921d6 | 2814 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
a17f091d | 2815 | return false; |
d14921d6 | 2816 | } |
cb4f4d3c | 2817 | |
c8e31f26 AG |
2818 | if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) && |
2819 | !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) { | |
d14921d6 | 2820 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
a17f091d | 2821 | return false; |
d14921d6 | 2822 | } |
c66ac9db NB |
2823 | /* |
2824 | * If we are already stopped due to an external event (ie: LUN shutdown) | |
2825 | * sleep until the connection can have the passed struct se_cmd back. | |
a1d8b49a | 2826 | * The cmd->transport_lun_stopped_sem will be upped by |
c66ac9db NB |
2827 | * transport_clear_lun_from_sessions() once the ConfigFS context caller |
2828 | * has completed its operation on the struct se_cmd. | |
2829 | */ | |
7d680f3b | 2830 | if (cmd->transport_state & CMD_T_LUN_STOP) { |
6708bb27 | 2831 | pr_debug("wait_for_tasks: Stopping" |
e3d6f909 | 2832 | " wait_for_completion(&cmd->t_tasktransport_lun_fe" |
c66ac9db | 2833 | "_stop_comp); for ITT: 0x%08x\n", |
e3d6f909 | 2834 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db NB |
2835 | /* |
2836 | * There is a special case for WRITES where a FE exception + | |
2837 | * LUN shutdown means ConfigFS context is still sleeping on | |
2838 | * transport_lun_stop_comp in transport_lun_wait_for_tasks(). | |
2839 | * We go ahead and up transport_lun_stop_comp just to be sure | |
2840 | * here. | |
2841 | */ | |
a1d8b49a AG |
2842 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
2843 | complete(&cmd->transport_lun_stop_comp); | |
2844 | wait_for_completion(&cmd->transport_lun_fe_stop_comp); | |
2845 | spin_lock_irqsave(&cmd->t_state_lock, flags); | |
c66ac9db | 2846 | |
cf572a96 | 2847 | target_remove_from_state_list(cmd); |
c66ac9db NB |
2848 | /* |
2849 | * At this point, the frontend who was the originator of this | |
2850 | * struct se_cmd, now owns the structure and can be released through | |
2851 | * normal means below. | |
2852 | */ | |
6708bb27 | 2853 | pr_debug("wait_for_tasks: Stopped" |
e3d6f909 | 2854 | " wait_for_completion(&cmd->t_tasktransport_lun_fe_" |
c66ac9db | 2855 | "stop_comp); for ITT: 0x%08x\n", |
e3d6f909 | 2856 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 2857 | |
7d680f3b | 2858 | cmd->transport_state &= ~CMD_T_LUN_STOP; |
c66ac9db | 2859 | } |
7d680f3b | 2860 | |
3d28934a | 2861 | if (!(cmd->transport_state & CMD_T_ACTIVE)) { |
d14921d6 | 2862 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
a17f091d | 2863 | return false; |
d14921d6 | 2864 | } |
c66ac9db | 2865 | |
7d680f3b | 2866 | cmd->transport_state |= CMD_T_STOP; |
c66ac9db | 2867 | |
6708bb27 | 2868 | pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x" |
7d680f3b | 2869 | " i_state: %d, t_state: %d, CMD_T_STOP\n", |
f2da9dbd CH |
2870 | cmd, cmd->se_tfo->get_task_tag(cmd), |
2871 | cmd->se_tfo->get_cmd_state(cmd), cmd->t_state); | |
c66ac9db | 2872 | |
a1d8b49a | 2873 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 2874 | |
5951146d | 2875 | wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq); |
c66ac9db | 2876 | |
a1d8b49a | 2877 | wait_for_completion(&cmd->t_transport_stop_comp); |
c66ac9db | 2878 | |
a1d8b49a | 2879 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
7d680f3b | 2880 | cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP); |
c66ac9db | 2881 | |
6708bb27 | 2882 | pr_debug("wait_for_tasks: Stopped wait_for_compltion(" |
a1d8b49a | 2883 | "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n", |
e3d6f909 | 2884 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 2885 | |
d14921d6 | 2886 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
a17f091d NB |
2887 | |
2888 | return true; | |
c66ac9db | 2889 | } |
d14921d6 | 2890 | EXPORT_SYMBOL(transport_wait_for_tasks); |
c66ac9db NB |
2891 | |
2892 | static int transport_get_sense_codes( | |
2893 | struct se_cmd *cmd, | |
2894 | u8 *asc, | |
2895 | u8 *ascq) | |
2896 | { | |
2897 | *asc = cmd->scsi_asc; | |
2898 | *ascq = cmd->scsi_ascq; | |
2899 | ||
2900 | return 0; | |
2901 | } | |
2902 | ||
2903 | static int transport_set_sense_codes( | |
2904 | struct se_cmd *cmd, | |
2905 | u8 asc, | |
2906 | u8 ascq) | |
2907 | { | |
2908 | cmd->scsi_asc = asc; | |
2909 | cmd->scsi_ascq = ascq; | |
2910 | ||
2911 | return 0; | |
2912 | } | |
2913 | ||
2914 | int transport_send_check_condition_and_sense( | |
2915 | struct se_cmd *cmd, | |
2916 | u8 reason, | |
2917 | int from_transport) | |
2918 | { | |
2919 | unsigned char *buffer = cmd->sense_buffer; | |
2920 | unsigned long flags; | |
2921 | int offset; | |
2922 | u8 asc = 0, ascq = 0; | |
2923 | ||
a1d8b49a | 2924 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 2925 | if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) { |
a1d8b49a | 2926 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
2927 | return 0; |
2928 | } | |
2929 | cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION; | |
a1d8b49a | 2930 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
2931 | |
2932 | if (!reason && from_transport) | |
2933 | goto after_reason; | |
2934 | ||
2935 | if (!from_transport) | |
2936 | cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE; | |
2937 | /* | |
2938 | * Data Segment and SenseLength of the fabric response PDU. | |
2939 | * | |
2940 | * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE | |
2941 | * from include/scsi/scsi_cmnd.h | |
2942 | */ | |
e3d6f909 | 2943 | offset = cmd->se_tfo->set_fabric_sense_len(cmd, |
c66ac9db NB |
2944 | TRANSPORT_SENSE_BUFFER); |
2945 | /* | |
2946 | * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses | |
2947 | * SENSE KEY values from include/scsi/scsi.h | |
2948 | */ | |
2949 | switch (reason) { | |
2950 | case TCM_NON_EXISTENT_LUN: | |
eb39d340 NB |
2951 | /* CURRENT ERROR */ |
2952 | buffer[offset] = 0x70; | |
895f3022 | 2953 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
eb39d340 NB |
2954 | /* ILLEGAL REQUEST */ |
2955 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; | |
2956 | /* LOGICAL UNIT NOT SUPPORTED */ | |
2957 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25; | |
2958 | break; | |
c66ac9db NB |
2959 | case TCM_UNSUPPORTED_SCSI_OPCODE: |
2960 | case TCM_SECTOR_COUNT_TOO_MANY: | |
2961 | /* CURRENT ERROR */ | |
2962 | buffer[offset] = 0x70; | |
895f3022 | 2963 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
2964 | /* ILLEGAL REQUEST */ |
2965 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; | |
2966 | /* INVALID COMMAND OPERATION CODE */ | |
2967 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20; | |
2968 | break; | |
2969 | case TCM_UNKNOWN_MODE_PAGE: | |
2970 | /* CURRENT ERROR */ | |
2971 | buffer[offset] = 0x70; | |
895f3022 | 2972 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
2973 | /* ILLEGAL REQUEST */ |
2974 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; | |
2975 | /* INVALID FIELD IN CDB */ | |
2976 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24; | |
2977 | break; | |
2978 | case TCM_CHECK_CONDITION_ABORT_CMD: | |
2979 | /* CURRENT ERROR */ | |
2980 | buffer[offset] = 0x70; | |
895f3022 | 2981 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
2982 | /* ABORTED COMMAND */ |
2983 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; | |
2984 | /* BUS DEVICE RESET FUNCTION OCCURRED */ | |
2985 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29; | |
2986 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03; | |
2987 | break; | |
2988 | case TCM_INCORRECT_AMOUNT_OF_DATA: | |
2989 | /* CURRENT ERROR */ | |
2990 | buffer[offset] = 0x70; | |
895f3022 | 2991 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
2992 | /* ABORTED COMMAND */ |
2993 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; | |
2994 | /* WRITE ERROR */ | |
2995 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c; | |
2996 | /* NOT ENOUGH UNSOLICITED DATA */ | |
2997 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d; | |
2998 | break; | |
2999 | case TCM_INVALID_CDB_FIELD: | |
3000 | /* CURRENT ERROR */ | |
3001 | buffer[offset] = 0x70; | |
895f3022 | 3002 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
9fbc8909 RD |
3003 | /* ILLEGAL REQUEST */ |
3004 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; | |
c66ac9db NB |
3005 | /* INVALID FIELD IN CDB */ |
3006 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24; | |
3007 | break; | |
3008 | case TCM_INVALID_PARAMETER_LIST: | |
3009 | /* CURRENT ERROR */ | |
3010 | buffer[offset] = 0x70; | |
895f3022 | 3011 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
9fbc8909 RD |
3012 | /* ILLEGAL REQUEST */ |
3013 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; | |
c66ac9db NB |
3014 | /* INVALID FIELD IN PARAMETER LIST */ |
3015 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26; | |
3016 | break; | |
3017 | case TCM_UNEXPECTED_UNSOLICITED_DATA: | |
3018 | /* CURRENT ERROR */ | |
3019 | buffer[offset] = 0x70; | |
895f3022 | 3020 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
3021 | /* ABORTED COMMAND */ |
3022 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; | |
3023 | /* WRITE ERROR */ | |
3024 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c; | |
3025 | /* UNEXPECTED_UNSOLICITED_DATA */ | |
3026 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c; | |
3027 | break; | |
3028 | case TCM_SERVICE_CRC_ERROR: | |
3029 | /* CURRENT ERROR */ | |
3030 | buffer[offset] = 0x70; | |
895f3022 | 3031 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
3032 | /* ABORTED COMMAND */ |
3033 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; | |
3034 | /* PROTOCOL SERVICE CRC ERROR */ | |
3035 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47; | |
3036 | /* N/A */ | |
3037 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05; | |
3038 | break; | |
3039 | case TCM_SNACK_REJECTED: | |
3040 | /* CURRENT ERROR */ | |
3041 | buffer[offset] = 0x70; | |
895f3022 | 3042 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
3043 | /* ABORTED COMMAND */ |
3044 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; | |
3045 | /* READ ERROR */ | |
3046 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11; | |
3047 | /* FAILED RETRANSMISSION REQUEST */ | |
3048 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13; | |
3049 | break; | |
3050 | case TCM_WRITE_PROTECTED: | |
3051 | /* CURRENT ERROR */ | |
3052 | buffer[offset] = 0x70; | |
895f3022 | 3053 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
3054 | /* DATA PROTECT */ |
3055 | buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT; | |
3056 | /* WRITE PROTECTED */ | |
3057 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27; | |
3058 | break; | |
3059 | case TCM_CHECK_CONDITION_UNIT_ATTENTION: | |
3060 | /* CURRENT ERROR */ | |
3061 | buffer[offset] = 0x70; | |
895f3022 | 3062 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
3063 | /* UNIT ATTENTION */ |
3064 | buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION; | |
3065 | core_scsi3_ua_for_check_condition(cmd, &asc, &ascq); | |
3066 | buffer[offset+SPC_ASC_KEY_OFFSET] = asc; | |
3067 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq; | |
3068 | break; | |
3069 | case TCM_CHECK_CONDITION_NOT_READY: | |
3070 | /* CURRENT ERROR */ | |
3071 | buffer[offset] = 0x70; | |
895f3022 | 3072 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
3073 | /* Not Ready */ |
3074 | buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY; | |
3075 | transport_get_sense_codes(cmd, &asc, &ascq); | |
3076 | buffer[offset+SPC_ASC_KEY_OFFSET] = asc; | |
3077 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq; | |
3078 | break; | |
3079 | case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE: | |
3080 | default: | |
3081 | /* CURRENT ERROR */ | |
3082 | buffer[offset] = 0x70; | |
895f3022 | 3083 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
3084 | /* ILLEGAL REQUEST */ |
3085 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; | |
3086 | /* LOGICAL UNIT COMMUNICATION FAILURE */ | |
3087 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80; | |
3088 | break; | |
3089 | } | |
3090 | /* | |
3091 | * This code uses linux/include/scsi/scsi.h SAM status codes! | |
3092 | */ | |
3093 | cmd->scsi_status = SAM_STAT_CHECK_CONDITION; | |
3094 | /* | |
3095 | * Automatically padded, this value is encoded in the fabric's | |
3096 | * data_length response PDU containing the SCSI defined sense data. | |
3097 | */ | |
3098 | cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset; | |
3099 | ||
3100 | after_reason: | |
07bde79a | 3101 | return cmd->se_tfo->queue_status(cmd); |
c66ac9db NB |
3102 | } |
3103 | EXPORT_SYMBOL(transport_send_check_condition_and_sense); | |
3104 | ||
3105 | int transport_check_aborted_status(struct se_cmd *cmd, int send_status) | |
3106 | { | |
3107 | int ret = 0; | |
3108 | ||
7d680f3b | 3109 | if (cmd->transport_state & CMD_T_ABORTED) { |
6708bb27 | 3110 | if (!send_status || |
c66ac9db NB |
3111 | (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS)) |
3112 | return 1; | |
8b1e1244 | 3113 | |
6708bb27 | 3114 | pr_debug("Sending delayed SAM_STAT_TASK_ABORTED" |
c66ac9db | 3115 | " status for CDB: 0x%02x ITT: 0x%08x\n", |
a1d8b49a | 3116 | cmd->t_task_cdb[0], |
e3d6f909 | 3117 | cmd->se_tfo->get_task_tag(cmd)); |
8b1e1244 | 3118 | |
c66ac9db | 3119 | cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS; |
e3d6f909 | 3120 | cmd->se_tfo->queue_status(cmd); |
c66ac9db NB |
3121 | ret = 1; |
3122 | } | |
3123 | return ret; | |
3124 | } | |
3125 | EXPORT_SYMBOL(transport_check_aborted_status); | |
3126 | ||
3127 | void transport_send_task_abort(struct se_cmd *cmd) | |
3128 | { | |
c252f003 NB |
3129 | unsigned long flags; |
3130 | ||
3131 | spin_lock_irqsave(&cmd->t_state_lock, flags); | |
3132 | if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) { | |
3133 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
3134 | return; | |
3135 | } | |
3136 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
3137 | ||
c66ac9db NB |
3138 | /* |
3139 | * If there are still expected incoming fabric WRITEs, we wait | |
3140 | * until until they have completed before sending a TASK_ABORTED | |
3141 | * response. This response with TASK_ABORTED status will be | |
3142 | * queued back to fabric module by transport_check_aborted_status(). | |
3143 | */ | |
3144 | if (cmd->data_direction == DMA_TO_DEVICE) { | |
e3d6f909 | 3145 | if (cmd->se_tfo->write_pending_status(cmd) != 0) { |
7d680f3b | 3146 | cmd->transport_state |= CMD_T_ABORTED; |
c66ac9db | 3147 | smp_mb__after_atomic_inc(); |
c66ac9db NB |
3148 | } |
3149 | } | |
3150 | cmd->scsi_status = SAM_STAT_TASK_ABORTED; | |
8b1e1244 | 3151 | |
6708bb27 | 3152 | pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x," |
a1d8b49a | 3153 | " ITT: 0x%08x\n", cmd->t_task_cdb[0], |
e3d6f909 | 3154 | cmd->se_tfo->get_task_tag(cmd)); |
8b1e1244 | 3155 | |
e3d6f909 | 3156 | cmd->se_tfo->queue_status(cmd); |
c66ac9db NB |
3157 | } |
3158 | ||
e26d99ae | 3159 | static int transport_generic_do_tmr(struct se_cmd *cmd) |
c66ac9db | 3160 | { |
5951146d | 3161 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
3162 | struct se_tmr_req *tmr = cmd->se_tmr_req; |
3163 | int ret; | |
3164 | ||
3165 | switch (tmr->function) { | |
5c6cd613 | 3166 | case TMR_ABORT_TASK: |
3d28934a | 3167 | core_tmr_abort_task(dev, tmr, cmd->se_sess); |
c66ac9db | 3168 | break; |
5c6cd613 NB |
3169 | case TMR_ABORT_TASK_SET: |
3170 | case TMR_CLEAR_ACA: | |
3171 | case TMR_CLEAR_TASK_SET: | |
c66ac9db NB |
3172 | tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED; |
3173 | break; | |
5c6cd613 | 3174 | case TMR_LUN_RESET: |
c66ac9db NB |
3175 | ret = core_tmr_lun_reset(dev, tmr, NULL, NULL); |
3176 | tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE : | |
3177 | TMR_FUNCTION_REJECTED; | |
3178 | break; | |
5c6cd613 | 3179 | case TMR_TARGET_WARM_RESET: |
c66ac9db NB |
3180 | tmr->response = TMR_FUNCTION_REJECTED; |
3181 | break; | |
5c6cd613 | 3182 | case TMR_TARGET_COLD_RESET: |
c66ac9db NB |
3183 | tmr->response = TMR_FUNCTION_REJECTED; |
3184 | break; | |
c66ac9db | 3185 | default: |
6708bb27 | 3186 | pr_err("Uknown TMR function: 0x%02x.\n", |
c66ac9db NB |
3187 | tmr->function); |
3188 | tmr->response = TMR_FUNCTION_REJECTED; | |
3189 | break; | |
3190 | } | |
3191 | ||
3192 | cmd->t_state = TRANSPORT_ISTATE_PROCESSING; | |
e3d6f909 | 3193 | cmd->se_tfo->queue_tm_rsp(cmd); |
c66ac9db | 3194 | |
b7b8bef7 | 3195 | transport_cmd_check_stop_to_fabric(cmd); |
c66ac9db NB |
3196 | return 0; |
3197 | } | |
3198 | ||
c66ac9db NB |
3199 | /* transport_processing_thread(): |
3200 | * | |
3201 | * | |
3202 | */ | |
3203 | static int transport_processing_thread(void *param) | |
3204 | { | |
5951146d | 3205 | int ret; |
c66ac9db | 3206 | struct se_cmd *cmd; |
8359cf43 | 3207 | struct se_device *dev = param; |
c66ac9db | 3208 | |
c66ac9db | 3209 | while (!kthread_should_stop()) { |
e3d6f909 AG |
3210 | ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq, |
3211 | atomic_read(&dev->dev_queue_obj.queue_cnt) || | |
c66ac9db NB |
3212 | kthread_should_stop()); |
3213 | if (ret < 0) | |
3214 | goto out; | |
3215 | ||
c66ac9db | 3216 | get_cmd: |
5951146d AG |
3217 | cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj); |
3218 | if (!cmd) | |
c66ac9db NB |
3219 | continue; |
3220 | ||
5951146d | 3221 | switch (cmd->t_state) { |
680b73c5 CH |
3222 | case TRANSPORT_NEW_CMD: |
3223 | BUG(); | |
3224 | break; | |
c66ac9db NB |
3225 | case TRANSPORT_PROCESS_TMR: |
3226 | transport_generic_do_tmr(cmd); | |
3227 | break; | |
c66ac9db | 3228 | default: |
f2da9dbd CH |
3229 | pr_err("Unknown t_state: %d for ITT: 0x%08x " |
3230 | "i_state: %d on SE LUN: %u\n", | |
3231 | cmd->t_state, | |
e3d6f909 AG |
3232 | cmd->se_tfo->get_task_tag(cmd), |
3233 | cmd->se_tfo->get_cmd_state(cmd), | |
3234 | cmd->se_lun->unpacked_lun); | |
c66ac9db NB |
3235 | BUG(); |
3236 | } | |
3237 | ||
3238 | goto get_cmd; | |
3239 | } | |
3240 | ||
3241 | out: | |
cf572a96 | 3242 | WARN_ON(!list_empty(&dev->state_list)); |
ce8762f6 | 3243 | WARN_ON(!list_empty(&dev->dev_queue_obj.qobj_list)); |
c66ac9db NB |
3244 | dev->process_thread = NULL; |
3245 | return 0; | |
3246 | } |