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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 | ||
c66ac9db | 69 | static int transport_generic_write_pending(struct se_cmd *); |
5951146d | 70 | static int transport_processing_thread(void *param); |
4d2300cc | 71 | static int __transport_execute_tasks(struct se_device *dev, struct se_cmd *); |
c66ac9db | 72 | static void transport_complete_task_attr(struct se_cmd *cmd); |
07bde79a | 73 | static void transport_handle_queue_full(struct se_cmd *cmd, |
e057f533 | 74 | struct se_device *dev); |
05d1c7c0 | 75 | static int transport_generic_get_mem(struct se_cmd *cmd); |
39c05f32 | 76 | static void transport_put_cmd(struct se_cmd *cmd); |
3df8d40b | 77 | static void transport_remove_cmd_from_queue(struct se_cmd *cmd); |
c66ac9db | 78 | static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq); |
35e0e757 | 79 | static void target_complete_ok_work(struct work_struct *work); |
c66ac9db | 80 | |
e3d6f909 | 81 | int init_se_kmem_caches(void) |
c66ac9db | 82 | { |
c66ac9db NB |
83 | se_sess_cache = kmem_cache_create("se_sess_cache", |
84 | sizeof(struct se_session), __alignof__(struct se_session), | |
85 | 0, NULL); | |
6708bb27 AG |
86 | if (!se_sess_cache) { |
87 | pr_err("kmem_cache_create() for struct se_session" | |
c66ac9db | 88 | " failed\n"); |
c8e31f26 | 89 | goto out; |
c66ac9db NB |
90 | } |
91 | se_ua_cache = kmem_cache_create("se_ua_cache", | |
92 | sizeof(struct se_ua), __alignof__(struct se_ua), | |
93 | 0, NULL); | |
6708bb27 AG |
94 | if (!se_ua_cache) { |
95 | pr_err("kmem_cache_create() for struct se_ua failed\n"); | |
35e0e757 | 96 | goto out_free_sess_cache; |
c66ac9db | 97 | } |
c66ac9db NB |
98 | t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache", |
99 | sizeof(struct t10_pr_registration), | |
100 | __alignof__(struct t10_pr_registration), 0, NULL); | |
6708bb27 AG |
101 | if (!t10_pr_reg_cache) { |
102 | pr_err("kmem_cache_create() for struct t10_pr_registration" | |
c66ac9db | 103 | " failed\n"); |
35e0e757 | 104 | goto out_free_ua_cache; |
c66ac9db NB |
105 | } |
106 | t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache", | |
107 | sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp), | |
108 | 0, NULL); | |
6708bb27 AG |
109 | if (!t10_alua_lu_gp_cache) { |
110 | pr_err("kmem_cache_create() for t10_alua_lu_gp_cache" | |
c66ac9db | 111 | " failed\n"); |
35e0e757 | 112 | goto out_free_pr_reg_cache; |
c66ac9db NB |
113 | } |
114 | t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache", | |
115 | sizeof(struct t10_alua_lu_gp_member), | |
116 | __alignof__(struct t10_alua_lu_gp_member), 0, NULL); | |
6708bb27 AG |
117 | if (!t10_alua_lu_gp_mem_cache) { |
118 | pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_" | |
c66ac9db | 119 | "cache failed\n"); |
35e0e757 | 120 | goto out_free_lu_gp_cache; |
c66ac9db NB |
121 | } |
122 | t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache", | |
123 | sizeof(struct t10_alua_tg_pt_gp), | |
124 | __alignof__(struct t10_alua_tg_pt_gp), 0, NULL); | |
6708bb27 AG |
125 | if (!t10_alua_tg_pt_gp_cache) { |
126 | pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_" | |
c66ac9db | 127 | "cache failed\n"); |
35e0e757 | 128 | goto out_free_lu_gp_mem_cache; |
c66ac9db NB |
129 | } |
130 | t10_alua_tg_pt_gp_mem_cache = kmem_cache_create( | |
131 | "t10_alua_tg_pt_gp_mem_cache", | |
132 | sizeof(struct t10_alua_tg_pt_gp_member), | |
133 | __alignof__(struct t10_alua_tg_pt_gp_member), | |
134 | 0, NULL); | |
6708bb27 AG |
135 | if (!t10_alua_tg_pt_gp_mem_cache) { |
136 | pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_" | |
c66ac9db | 137 | "mem_t failed\n"); |
35e0e757 | 138 | goto out_free_tg_pt_gp_cache; |
c66ac9db NB |
139 | } |
140 | ||
35e0e757 CH |
141 | target_completion_wq = alloc_workqueue("target_completion", |
142 | WQ_MEM_RECLAIM, 0); | |
143 | if (!target_completion_wq) | |
144 | goto out_free_tg_pt_gp_mem_cache; | |
145 | ||
c66ac9db | 146 | return 0; |
35e0e757 CH |
147 | |
148 | out_free_tg_pt_gp_mem_cache: | |
149 | kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache); | |
150 | out_free_tg_pt_gp_cache: | |
151 | kmem_cache_destroy(t10_alua_tg_pt_gp_cache); | |
152 | out_free_lu_gp_mem_cache: | |
153 | kmem_cache_destroy(t10_alua_lu_gp_mem_cache); | |
154 | out_free_lu_gp_cache: | |
155 | kmem_cache_destroy(t10_alua_lu_gp_cache); | |
156 | out_free_pr_reg_cache: | |
157 | kmem_cache_destroy(t10_pr_reg_cache); | |
158 | out_free_ua_cache: | |
159 | kmem_cache_destroy(se_ua_cache); | |
160 | out_free_sess_cache: | |
161 | kmem_cache_destroy(se_sess_cache); | |
c66ac9db | 162 | out: |
e3d6f909 | 163 | return -ENOMEM; |
c66ac9db NB |
164 | } |
165 | ||
e3d6f909 | 166 | void release_se_kmem_caches(void) |
c66ac9db | 167 | { |
35e0e757 | 168 | destroy_workqueue(target_completion_wq); |
c66ac9db NB |
169 | kmem_cache_destroy(se_sess_cache); |
170 | kmem_cache_destroy(se_ua_cache); | |
c66ac9db NB |
171 | kmem_cache_destroy(t10_pr_reg_cache); |
172 | kmem_cache_destroy(t10_alua_lu_gp_cache); | |
173 | kmem_cache_destroy(t10_alua_lu_gp_mem_cache); | |
174 | kmem_cache_destroy(t10_alua_tg_pt_gp_cache); | |
175 | kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache); | |
c66ac9db NB |
176 | } |
177 | ||
e3d6f909 AG |
178 | /* This code ensures unique mib indexes are handed out. */ |
179 | static DEFINE_SPINLOCK(scsi_mib_index_lock); | |
180 | static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX]; | |
e89d15ee NB |
181 | |
182 | /* | |
183 | * Allocate a new row index for the entry type specified | |
184 | */ | |
185 | u32 scsi_get_new_index(scsi_index_t type) | |
186 | { | |
187 | u32 new_index; | |
188 | ||
e3d6f909 | 189 | BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX)); |
e89d15ee | 190 | |
e3d6f909 AG |
191 | spin_lock(&scsi_mib_index_lock); |
192 | new_index = ++scsi_mib_index[type]; | |
193 | spin_unlock(&scsi_mib_index_lock); | |
e89d15ee NB |
194 | |
195 | return new_index; | |
196 | } | |
197 | ||
e26d99ae | 198 | static void transport_init_queue_obj(struct se_queue_obj *qobj) |
c66ac9db NB |
199 | { |
200 | atomic_set(&qobj->queue_cnt, 0); | |
201 | INIT_LIST_HEAD(&qobj->qobj_list); | |
202 | init_waitqueue_head(&qobj->thread_wq); | |
203 | spin_lock_init(&qobj->cmd_queue_lock); | |
204 | } | |
c66ac9db | 205 | |
dbc5623e | 206 | void transport_subsystem_check_init(void) |
c66ac9db NB |
207 | { |
208 | int ret; | |
209 | ||
dbc5623e NB |
210 | if (sub_api_initialized) |
211 | return; | |
212 | ||
c66ac9db NB |
213 | ret = request_module("target_core_iblock"); |
214 | if (ret != 0) | |
6708bb27 | 215 | pr_err("Unable to load target_core_iblock\n"); |
c66ac9db NB |
216 | |
217 | ret = request_module("target_core_file"); | |
218 | if (ret != 0) | |
6708bb27 | 219 | pr_err("Unable to load target_core_file\n"); |
c66ac9db NB |
220 | |
221 | ret = request_module("target_core_pscsi"); | |
222 | if (ret != 0) | |
6708bb27 | 223 | pr_err("Unable to load target_core_pscsi\n"); |
c66ac9db NB |
224 | |
225 | ret = request_module("target_core_stgt"); | |
226 | if (ret != 0) | |
6708bb27 | 227 | pr_err("Unable to load target_core_stgt\n"); |
c66ac9db | 228 | |
e3d6f909 | 229 | sub_api_initialized = 1; |
dbc5623e | 230 | return; |
c66ac9db NB |
231 | } |
232 | ||
233 | struct se_session *transport_init_session(void) | |
234 | { | |
235 | struct se_session *se_sess; | |
236 | ||
237 | se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL); | |
6708bb27 AG |
238 | if (!se_sess) { |
239 | pr_err("Unable to allocate struct se_session from" | |
c66ac9db NB |
240 | " se_sess_cache\n"); |
241 | return ERR_PTR(-ENOMEM); | |
242 | } | |
243 | INIT_LIST_HEAD(&se_sess->sess_list); | |
244 | INIT_LIST_HEAD(&se_sess->sess_acl_list); | |
a17f091d NB |
245 | INIT_LIST_HEAD(&se_sess->sess_cmd_list); |
246 | INIT_LIST_HEAD(&se_sess->sess_wait_list); | |
247 | spin_lock_init(&se_sess->sess_cmd_lock); | |
41ac82b6 | 248 | kref_init(&se_sess->sess_kref); |
c66ac9db NB |
249 | |
250 | return se_sess; | |
251 | } | |
252 | EXPORT_SYMBOL(transport_init_session); | |
253 | ||
254 | /* | |
140854cb | 255 | * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called. |
c66ac9db NB |
256 | */ |
257 | void __transport_register_session( | |
258 | struct se_portal_group *se_tpg, | |
259 | struct se_node_acl *se_nacl, | |
260 | struct se_session *se_sess, | |
261 | void *fabric_sess_ptr) | |
262 | { | |
263 | unsigned char buf[PR_REG_ISID_LEN]; | |
264 | ||
265 | se_sess->se_tpg = se_tpg; | |
266 | se_sess->fabric_sess_ptr = fabric_sess_ptr; | |
267 | /* | |
268 | * Used by struct se_node_acl's under ConfigFS to locate active se_session-t | |
269 | * | |
270 | * Only set for struct se_session's that will actually be moving I/O. | |
271 | * eg: *NOT* discovery sessions. | |
272 | */ | |
273 | if (se_nacl) { | |
274 | /* | |
275 | * If the fabric module supports an ISID based TransportID, | |
276 | * save this value in binary from the fabric I_T Nexus now. | |
277 | */ | |
e3d6f909 | 278 | if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { |
c66ac9db | 279 | memset(&buf[0], 0, PR_REG_ISID_LEN); |
e3d6f909 | 280 | se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, |
c66ac9db NB |
281 | &buf[0], PR_REG_ISID_LEN); |
282 | se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]); | |
283 | } | |
afb999ff NB |
284 | kref_get(&se_nacl->acl_kref); |
285 | ||
c66ac9db NB |
286 | spin_lock_irq(&se_nacl->nacl_sess_lock); |
287 | /* | |
288 | * The se_nacl->nacl_sess pointer will be set to the | |
289 | * last active I_T Nexus for each struct se_node_acl. | |
290 | */ | |
291 | se_nacl->nacl_sess = se_sess; | |
292 | ||
293 | list_add_tail(&se_sess->sess_acl_list, | |
294 | &se_nacl->acl_sess_list); | |
295 | spin_unlock_irq(&se_nacl->nacl_sess_lock); | |
296 | } | |
297 | list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list); | |
298 | ||
6708bb27 | 299 | pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n", |
e3d6f909 | 300 | se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr); |
c66ac9db NB |
301 | } |
302 | EXPORT_SYMBOL(__transport_register_session); | |
303 | ||
304 | void transport_register_session( | |
305 | struct se_portal_group *se_tpg, | |
306 | struct se_node_acl *se_nacl, | |
307 | struct se_session *se_sess, | |
308 | void *fabric_sess_ptr) | |
309 | { | |
140854cb NB |
310 | unsigned long flags; |
311 | ||
312 | spin_lock_irqsave(&se_tpg->session_lock, flags); | |
c66ac9db | 313 | __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr); |
140854cb | 314 | spin_unlock_irqrestore(&se_tpg->session_lock, flags); |
c66ac9db NB |
315 | } |
316 | EXPORT_SYMBOL(transport_register_session); | |
317 | ||
4149268e | 318 | void target_release_session(struct kref *kref) |
41ac82b6 NB |
319 | { |
320 | struct se_session *se_sess = container_of(kref, | |
321 | struct se_session, sess_kref); | |
322 | struct se_portal_group *se_tpg = se_sess->se_tpg; | |
323 | ||
324 | se_tpg->se_tpg_tfo->close_session(se_sess); | |
325 | } | |
326 | ||
327 | void target_get_session(struct se_session *se_sess) | |
328 | { | |
329 | kref_get(&se_sess->sess_kref); | |
330 | } | |
331 | EXPORT_SYMBOL(target_get_session); | |
332 | ||
33933a0e | 333 | void target_put_session(struct se_session *se_sess) |
41ac82b6 | 334 | { |
4149268e JE |
335 | struct se_portal_group *tpg = se_sess->se_tpg; |
336 | ||
337 | if (tpg->se_tpg_tfo->put_session != NULL) { | |
338 | tpg->se_tpg_tfo->put_session(se_sess); | |
339 | return; | |
340 | } | |
33933a0e | 341 | kref_put(&se_sess->sess_kref, target_release_session); |
41ac82b6 NB |
342 | } |
343 | EXPORT_SYMBOL(target_put_session); | |
344 | ||
afb999ff NB |
345 | static void target_complete_nacl(struct kref *kref) |
346 | { | |
347 | struct se_node_acl *nacl = container_of(kref, | |
348 | struct se_node_acl, acl_kref); | |
349 | ||
350 | complete(&nacl->acl_free_comp); | |
351 | } | |
352 | ||
353 | void target_put_nacl(struct se_node_acl *nacl) | |
354 | { | |
355 | kref_put(&nacl->acl_kref, target_complete_nacl); | |
356 | } | |
357 | ||
c66ac9db NB |
358 | void transport_deregister_session_configfs(struct se_session *se_sess) |
359 | { | |
360 | struct se_node_acl *se_nacl; | |
23388864 | 361 | unsigned long flags; |
c66ac9db NB |
362 | /* |
363 | * Used by struct se_node_acl's under ConfigFS to locate active struct se_session | |
364 | */ | |
365 | se_nacl = se_sess->se_node_acl; | |
6708bb27 | 366 | if (se_nacl) { |
23388864 | 367 | spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags); |
337c0607 NB |
368 | if (se_nacl->acl_stop == 0) |
369 | list_del(&se_sess->sess_acl_list); | |
c66ac9db NB |
370 | /* |
371 | * If the session list is empty, then clear the pointer. | |
372 | * Otherwise, set the struct se_session pointer from the tail | |
373 | * element of the per struct se_node_acl active session list. | |
374 | */ | |
375 | if (list_empty(&se_nacl->acl_sess_list)) | |
376 | se_nacl->nacl_sess = NULL; | |
377 | else { | |
378 | se_nacl->nacl_sess = container_of( | |
379 | se_nacl->acl_sess_list.prev, | |
380 | struct se_session, sess_acl_list); | |
381 | } | |
23388864 | 382 | spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags); |
c66ac9db NB |
383 | } |
384 | } | |
385 | EXPORT_SYMBOL(transport_deregister_session_configfs); | |
386 | ||
387 | void transport_free_session(struct se_session *se_sess) | |
388 | { | |
389 | kmem_cache_free(se_sess_cache, se_sess); | |
390 | } | |
391 | EXPORT_SYMBOL(transport_free_session); | |
392 | ||
393 | void transport_deregister_session(struct se_session *se_sess) | |
394 | { | |
395 | struct se_portal_group *se_tpg = se_sess->se_tpg; | |
01468346 | 396 | struct target_core_fabric_ops *se_tfo; |
c66ac9db | 397 | struct se_node_acl *se_nacl; |
e63a8e19 | 398 | unsigned long flags; |
01468346 | 399 | bool comp_nacl = true; |
c66ac9db | 400 | |
6708bb27 | 401 | if (!se_tpg) { |
c66ac9db NB |
402 | transport_free_session(se_sess); |
403 | return; | |
404 | } | |
01468346 | 405 | se_tfo = se_tpg->se_tpg_tfo; |
c66ac9db | 406 | |
e63a8e19 | 407 | spin_lock_irqsave(&se_tpg->session_lock, flags); |
c66ac9db NB |
408 | list_del(&se_sess->sess_list); |
409 | se_sess->se_tpg = NULL; | |
410 | se_sess->fabric_sess_ptr = NULL; | |
e63a8e19 | 411 | spin_unlock_irqrestore(&se_tpg->session_lock, flags); |
c66ac9db NB |
412 | |
413 | /* | |
414 | * Determine if we need to do extra work for this initiator node's | |
415 | * struct se_node_acl if it had been previously dynamically generated. | |
416 | */ | |
417 | se_nacl = se_sess->se_node_acl; | |
01468346 NB |
418 | |
419 | spin_lock_irqsave(&se_tpg->acl_node_lock, flags); | |
420 | if (se_nacl && se_nacl->dynamic_node_acl) { | |
421 | if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) { | |
422 | list_del(&se_nacl->acl_list); | |
423 | se_tpg->num_node_acls--; | |
424 | spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags); | |
425 | core_tpg_wait_for_nacl_pr_ref(se_nacl); | |
426 | core_free_device_list_for_node(se_nacl, se_tpg); | |
427 | se_tfo->tpg_release_fabric_acl(se_tpg, se_nacl); | |
428 | ||
429 | comp_nacl = false; | |
430 | spin_lock_irqsave(&se_tpg->acl_node_lock, flags); | |
c66ac9db | 431 | } |
c66ac9db | 432 | } |
01468346 | 433 | spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags); |
c66ac9db | 434 | |
6708bb27 | 435 | pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n", |
e3d6f909 | 436 | se_tpg->se_tpg_tfo->get_fabric_name()); |
01468346 | 437 | /* |
afb999ff NB |
438 | * If last kref is dropping now for an explict NodeACL, awake sleeping |
439 | * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group | |
440 | * removal context. | |
01468346 NB |
441 | */ |
442 | if (se_nacl && comp_nacl == true) | |
afb999ff | 443 | target_put_nacl(se_nacl); |
01468346 | 444 | |
afb999ff | 445 | transport_free_session(se_sess); |
c66ac9db NB |
446 | } |
447 | EXPORT_SYMBOL(transport_deregister_session); | |
448 | ||
449 | /* | |
a1d8b49a | 450 | * Called with cmd->t_state_lock held. |
c66ac9db | 451 | */ |
cf572a96 | 452 | static void target_remove_from_state_list(struct se_cmd *cmd) |
c66ac9db | 453 | { |
42bf829e | 454 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
455 | unsigned long flags; |
456 | ||
42bf829e CH |
457 | if (!dev) |
458 | return; | |
c66ac9db | 459 | |
cf572a96 CH |
460 | if (cmd->transport_state & CMD_T_BUSY) |
461 | return; | |
c66ac9db | 462 | |
cf572a96 CH |
463 | spin_lock_irqsave(&dev->execute_task_lock, flags); |
464 | if (cmd->state_active) { | |
465 | list_del(&cmd->state_list); | |
cf572a96 | 466 | cmd->state_active = false; |
c66ac9db | 467 | } |
cf572a96 | 468 | spin_unlock_irqrestore(&dev->execute_task_lock, flags); |
c66ac9db NB |
469 | } |
470 | ||
471 | /* transport_cmd_check_stop(): | |
472 | * | |
7d680f3b | 473 | * 'transport_off = 1' determines if CMD_T_ACTIVE should be cleared. |
c66ac9db NB |
474 | * 'transport_off = 2' determines if task_dev_state should be removed. |
475 | * | |
476 | * A non-zero u8 t_state sets cmd->t_state. | |
477 | * Returns 1 when command is stopped, else 0. | |
478 | */ | |
479 | static int transport_cmd_check_stop( | |
480 | struct se_cmd *cmd, | |
481 | int transport_off, | |
482 | u8 t_state) | |
483 | { | |
484 | unsigned long flags; | |
485 | ||
a1d8b49a | 486 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db NB |
487 | /* |
488 | * Determine if IOCTL context caller in requesting the stopping of this | |
489 | * command for LUN shutdown purposes. | |
490 | */ | |
7d680f3b CH |
491 | if (cmd->transport_state & CMD_T_LUN_STOP) { |
492 | pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n", | |
493 | __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd)); | |
c66ac9db | 494 | |
7d680f3b | 495 | cmd->transport_state &= ~CMD_T_ACTIVE; |
c66ac9db | 496 | if (transport_off == 2) |
cf572a96 | 497 | target_remove_from_state_list(cmd); |
a1d8b49a | 498 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 499 | |
a1d8b49a | 500 | complete(&cmd->transport_lun_stop_comp); |
c66ac9db NB |
501 | return 1; |
502 | } | |
503 | /* | |
504 | * Determine if frontend context caller is requesting the stopping of | |
e3d6f909 | 505 | * this command for frontend exceptions. |
c66ac9db | 506 | */ |
7d680f3b CH |
507 | if (cmd->transport_state & CMD_T_STOP) { |
508 | pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n", | |
509 | __func__, __LINE__, | |
e3d6f909 | 510 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 511 | |
c66ac9db | 512 | if (transport_off == 2) |
cf572a96 | 513 | target_remove_from_state_list(cmd); |
c66ac9db NB |
514 | |
515 | /* | |
516 | * Clear struct se_cmd->se_lun before the transport_off == 2 handoff | |
517 | * to FE. | |
518 | */ | |
519 | if (transport_off == 2) | |
520 | cmd->se_lun = NULL; | |
a1d8b49a | 521 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 522 | |
a1d8b49a | 523 | complete(&cmd->t_transport_stop_comp); |
c66ac9db NB |
524 | return 1; |
525 | } | |
526 | if (transport_off) { | |
7d680f3b | 527 | cmd->transport_state &= ~CMD_T_ACTIVE; |
c66ac9db | 528 | if (transport_off == 2) { |
cf572a96 | 529 | target_remove_from_state_list(cmd); |
c66ac9db NB |
530 | /* |
531 | * Clear struct se_cmd->se_lun before the transport_off == 2 | |
532 | * handoff to fabric module. | |
533 | */ | |
534 | cmd->se_lun = NULL; | |
535 | /* | |
536 | * Some fabric modules like tcm_loop can release | |
25985edc | 537 | * their internally allocated I/O reference now and |
c66ac9db | 538 | * struct se_cmd now. |
88dd9e26 NB |
539 | * |
540 | * Fabric modules are expected to return '1' here if the | |
541 | * se_cmd being passed is released at this point, | |
542 | * or zero if not being released. | |
c66ac9db | 543 | */ |
e3d6f909 | 544 | if (cmd->se_tfo->check_stop_free != NULL) { |
c66ac9db | 545 | spin_unlock_irqrestore( |
a1d8b49a | 546 | &cmd->t_state_lock, flags); |
c66ac9db | 547 | |
88dd9e26 | 548 | return cmd->se_tfo->check_stop_free(cmd); |
c66ac9db NB |
549 | } |
550 | } | |
a1d8b49a | 551 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
552 | |
553 | return 0; | |
554 | } else if (t_state) | |
555 | cmd->t_state = t_state; | |
a1d8b49a | 556 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
557 | |
558 | return 0; | |
559 | } | |
560 | ||
561 | static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd) | |
562 | { | |
563 | return transport_cmd_check_stop(cmd, 2, 0); | |
564 | } | |
565 | ||
566 | static void transport_lun_remove_cmd(struct se_cmd *cmd) | |
567 | { | |
e3d6f909 | 568 | struct se_lun *lun = cmd->se_lun; |
c66ac9db NB |
569 | unsigned long flags; |
570 | ||
571 | if (!lun) | |
572 | return; | |
573 | ||
a1d8b49a | 574 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
7d680f3b CH |
575 | if (cmd->transport_state & CMD_T_DEV_ACTIVE) { |
576 | cmd->transport_state &= ~CMD_T_DEV_ACTIVE; | |
cf572a96 | 577 | target_remove_from_state_list(cmd); |
c66ac9db | 578 | } |
a1d8b49a | 579 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 580 | |
c66ac9db | 581 | spin_lock_irqsave(&lun->lun_cmd_lock, flags); |
3d26fea0 CH |
582 | if (!list_empty(&cmd->se_lun_node)) |
583 | list_del_init(&cmd->se_lun_node); | |
c66ac9db NB |
584 | spin_unlock_irqrestore(&lun->lun_cmd_lock, flags); |
585 | } | |
586 | ||
587 | void transport_cmd_finish_abort(struct se_cmd *cmd, int remove) | |
588 | { | |
c8e31f26 | 589 | if (!(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) |
8dc52b54 | 590 | transport_lun_remove_cmd(cmd); |
c66ac9db NB |
591 | |
592 | if (transport_cmd_check_stop_to_fabric(cmd)) | |
593 | return; | |
77039d1e | 594 | if (remove) { |
3df8d40b | 595 | transport_remove_cmd_from_queue(cmd); |
e6a2573f | 596 | transport_put_cmd(cmd); |
77039d1e | 597 | } |
c66ac9db NB |
598 | } |
599 | ||
f7a5cc0b CH |
600 | static void transport_add_cmd_to_queue(struct se_cmd *cmd, int t_state, |
601 | bool at_head) | |
c66ac9db NB |
602 | { |
603 | struct se_device *dev = cmd->se_dev; | |
e3d6f909 | 604 | struct se_queue_obj *qobj = &dev->dev_queue_obj; |
c66ac9db NB |
605 | unsigned long flags; |
606 | ||
c66ac9db | 607 | if (t_state) { |
a1d8b49a | 608 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 609 | cmd->t_state = t_state; |
7d680f3b | 610 | cmd->transport_state |= CMD_T_ACTIVE; |
a1d8b49a | 611 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
612 | } |
613 | ||
614 | spin_lock_irqsave(&qobj->cmd_queue_lock, flags); | |
79a7fef2 RD |
615 | |
616 | /* If the cmd is already on the list, remove it before we add it */ | |
617 | if (!list_empty(&cmd->se_queue_node)) | |
618 | list_del(&cmd->se_queue_node); | |
619 | else | |
620 | atomic_inc(&qobj->queue_cnt); | |
621 | ||
f7a5cc0b | 622 | if (at_head) |
07bde79a | 623 | list_add(&cmd->se_queue_node, &qobj->qobj_list); |
f7a5cc0b | 624 | else |
07bde79a | 625 | list_add_tail(&cmd->se_queue_node, &qobj->qobj_list); |
7d680f3b | 626 | cmd->transport_state |= CMD_T_QUEUED; |
c66ac9db NB |
627 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); |
628 | ||
c66ac9db | 629 | wake_up_interruptible(&qobj->thread_wq); |
c66ac9db NB |
630 | } |
631 | ||
5951146d AG |
632 | static struct se_cmd * |
633 | transport_get_cmd_from_queue(struct se_queue_obj *qobj) | |
c66ac9db | 634 | { |
5951146d | 635 | struct se_cmd *cmd; |
c66ac9db NB |
636 | unsigned long flags; |
637 | ||
638 | spin_lock_irqsave(&qobj->cmd_queue_lock, flags); | |
639 | if (list_empty(&qobj->qobj_list)) { | |
640 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); | |
641 | return NULL; | |
642 | } | |
5951146d | 643 | cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node); |
c66ac9db | 644 | |
7d680f3b | 645 | cmd->transport_state &= ~CMD_T_QUEUED; |
79a7fef2 | 646 | list_del_init(&cmd->se_queue_node); |
c66ac9db NB |
647 | atomic_dec(&qobj->queue_cnt); |
648 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); | |
649 | ||
5951146d | 650 | return cmd; |
c66ac9db NB |
651 | } |
652 | ||
3df8d40b | 653 | static void transport_remove_cmd_from_queue(struct se_cmd *cmd) |
c66ac9db | 654 | { |
3df8d40b | 655 | struct se_queue_obj *qobj = &cmd->se_dev->dev_queue_obj; |
c66ac9db NB |
656 | unsigned long flags; |
657 | ||
658 | spin_lock_irqsave(&qobj->cmd_queue_lock, flags); | |
7d680f3b | 659 | if (!(cmd->transport_state & CMD_T_QUEUED)) { |
c66ac9db NB |
660 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); |
661 | return; | |
662 | } | |
7d680f3b | 663 | cmd->transport_state &= ~CMD_T_QUEUED; |
79a7fef2 RD |
664 | atomic_dec(&qobj->queue_cnt); |
665 | list_del_init(&cmd->se_queue_node); | |
c66ac9db | 666 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); |
c66ac9db NB |
667 | } |
668 | ||
35e0e757 CH |
669 | static void target_complete_failure_work(struct work_struct *work) |
670 | { | |
671 | struct se_cmd *cmd = container_of(work, struct se_cmd, work); | |
672 | ||
03e98c9e | 673 | transport_generic_request_failure(cmd); |
35e0e757 CH |
674 | } |
675 | ||
5787cacd | 676 | void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status) |
c66ac9db | 677 | { |
42bf829e | 678 | struct se_device *dev = cmd->se_dev; |
5787cacd | 679 | int success = scsi_status == GOOD; |
c66ac9db | 680 | unsigned long flags; |
c66ac9db | 681 | |
5787cacd CH |
682 | cmd->scsi_status = scsi_status; |
683 | ||
684 | ||
a1d8b49a | 685 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
cf572a96 | 686 | cmd->transport_state &= ~CMD_T_BUSY; |
c66ac9db | 687 | |
c66ac9db | 688 | if (dev && dev->transport->transport_complete) { |
5787cacd CH |
689 | if (dev->transport->transport_complete(cmd, |
690 | cmd->t_data_sg) != 0) { | |
c66ac9db | 691 | cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE; |
c66ac9db NB |
692 | success = 1; |
693 | } | |
694 | } | |
695 | ||
696 | /* | |
5787cacd | 697 | * See if we are waiting to complete for an exception condition. |
c66ac9db | 698 | */ |
cf572a96 | 699 | if (cmd->transport_state & CMD_T_REQUEST_STOP) { |
a1d8b49a | 700 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
cf572a96 | 701 | complete(&cmd->task_stop_comp); |
c66ac9db NB |
702 | return; |
703 | } | |
2235007c CH |
704 | |
705 | if (!success) | |
7d680f3b | 706 | cmd->transport_state |= CMD_T_FAILED; |
2235007c | 707 | |
3d28934a NB |
708 | /* |
709 | * Check for case where an explict ABORT_TASK has been received | |
710 | * and transport_wait_for_tasks() will be waiting for completion.. | |
711 | */ | |
712 | if (cmd->transport_state & CMD_T_ABORTED && | |
713 | cmd->transport_state & CMD_T_STOP) { | |
714 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
715 | complete(&cmd->t_transport_stop_comp); | |
716 | return; | |
717 | } else if (cmd->transport_state & CMD_T_FAILED) { | |
41e16e98 | 718 | cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
35e0e757 | 719 | INIT_WORK(&cmd->work, target_complete_failure_work); |
c66ac9db | 720 | } else { |
35e0e757 | 721 | INIT_WORK(&cmd->work, target_complete_ok_work); |
c66ac9db | 722 | } |
35e0e757 | 723 | |
35e0e757 | 724 | cmd->t_state = TRANSPORT_COMPLETE; |
3d28934a | 725 | cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE); |
a1d8b49a | 726 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 727 | |
35e0e757 | 728 | queue_work(target_completion_wq, &cmd->work); |
c66ac9db | 729 | } |
6bb35e00 CH |
730 | EXPORT_SYMBOL(target_complete_cmd); |
731 | ||
cf572a96 | 732 | static void target_add_to_state_list(struct se_cmd *cmd) |
c66ac9db | 733 | { |
cf572a96 CH |
734 | struct se_device *dev = cmd->se_dev; |
735 | unsigned long flags; | |
c66ac9db | 736 | |
cf572a96 CH |
737 | spin_lock_irqsave(&dev->execute_task_lock, flags); |
738 | if (!cmd->state_active) { | |
739 | list_add_tail(&cmd->state_list, &dev->state_list); | |
740 | cmd->state_active = true; | |
c66ac9db | 741 | } |
cf572a96 | 742 | spin_unlock_irqrestore(&dev->execute_task_lock, flags); |
c66ac9db NB |
743 | } |
744 | ||
cf572a96 | 745 | static void __target_add_to_execute_list(struct se_cmd *cmd) |
c66ac9db | 746 | { |
cf572a96 CH |
747 | struct se_device *dev = cmd->se_dev; |
748 | bool head_of_queue = false; | |
c66ac9db | 749 | |
cf572a96 | 750 | if (!list_empty(&cmd->execute_list)) |
c66ac9db | 751 | return; |
c66ac9db | 752 | |
cf572a96 CH |
753 | if (dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED && |
754 | cmd->sam_task_attr == MSG_HEAD_TAG) | |
755 | head_of_queue = true; | |
c66ac9db | 756 | |
cf572a96 CH |
757 | if (head_of_queue) |
758 | list_add(&cmd->execute_list, &dev->execute_list); | |
759 | else | |
760 | list_add_tail(&cmd->execute_list, &dev->execute_list); | |
785fdf70 | 761 | |
cf572a96 | 762 | atomic_inc(&dev->execute_tasks); |
1880807a | 763 | |
cf572a96 CH |
764 | if (cmd->state_active) |
765 | return; | |
c66ac9db | 766 | |
cf572a96 CH |
767 | if (head_of_queue) |
768 | list_add(&cmd->state_list, &dev->state_list); | |
769 | else | |
770 | list_add_tail(&cmd->state_list, &dev->state_list); | |
c66ac9db | 771 | |
cf572a96 | 772 | cmd->state_active = true; |
4d2300cc NB |
773 | } |
774 | ||
cf572a96 | 775 | static void target_add_to_execute_list(struct se_cmd *cmd) |
4d2300cc NB |
776 | { |
777 | unsigned long flags; | |
778 | struct se_device *dev = cmd->se_dev; | |
779 | ||
780 | spin_lock_irqsave(&dev->execute_task_lock, flags); | |
cf572a96 | 781 | __target_add_to_execute_list(cmd); |
c66ac9db | 782 | spin_unlock_irqrestore(&dev->execute_task_lock, flags); |
c66ac9db NB |
783 | } |
784 | ||
cf572a96 | 785 | void __target_remove_from_execute_list(struct se_cmd *cmd) |
04629b7b | 786 | { |
cf572a96 CH |
787 | list_del_init(&cmd->execute_list); |
788 | atomic_dec(&cmd->se_dev->execute_tasks); | |
04629b7b CH |
789 | } |
790 | ||
cf572a96 | 791 | static void target_remove_from_execute_list(struct se_cmd *cmd) |
c66ac9db | 792 | { |
cf572a96 | 793 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
794 | unsigned long flags; |
795 | ||
cf572a96 | 796 | if (WARN_ON(list_empty(&cmd->execute_list))) |
af57c3ac | 797 | return; |
af57c3ac | 798 | |
c66ac9db | 799 | spin_lock_irqsave(&dev->execute_task_lock, flags); |
cf572a96 | 800 | __target_remove_from_execute_list(cmd); |
c66ac9db NB |
801 | spin_unlock_irqrestore(&dev->execute_task_lock, flags); |
802 | } | |
803 | ||
07bde79a | 804 | /* |
f147abb4 | 805 | * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status |
07bde79a NB |
806 | */ |
807 | ||
808 | static void target_qf_do_work(struct work_struct *work) | |
809 | { | |
810 | struct se_device *dev = container_of(work, struct se_device, | |
811 | qf_work_queue); | |
bcac364a | 812 | LIST_HEAD(qf_cmd_list); |
07bde79a NB |
813 | struct se_cmd *cmd, *cmd_tmp; |
814 | ||
815 | spin_lock_irq(&dev->qf_cmd_lock); | |
bcac364a RD |
816 | list_splice_init(&dev->qf_cmd_list, &qf_cmd_list); |
817 | spin_unlock_irq(&dev->qf_cmd_lock); | |
07bde79a | 818 | |
bcac364a | 819 | list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) { |
07bde79a NB |
820 | list_del(&cmd->se_qf_node); |
821 | atomic_dec(&dev->dev_qf_count); | |
822 | smp_mb__after_atomic_dec(); | |
07bde79a | 823 | |
6708bb27 | 824 | pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue" |
07bde79a | 825 | " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd, |
e057f533 | 826 | (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" : |
07bde79a NB |
827 | (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING" |
828 | : "UNKNOWN"); | |
f7a5cc0b CH |
829 | |
830 | transport_add_cmd_to_queue(cmd, cmd->t_state, true); | |
07bde79a | 831 | } |
07bde79a NB |
832 | } |
833 | ||
c66ac9db NB |
834 | unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd) |
835 | { | |
836 | switch (cmd->data_direction) { | |
837 | case DMA_NONE: | |
838 | return "NONE"; | |
839 | case DMA_FROM_DEVICE: | |
840 | return "READ"; | |
841 | case DMA_TO_DEVICE: | |
842 | return "WRITE"; | |
843 | case DMA_BIDIRECTIONAL: | |
844 | return "BIDI"; | |
845 | default: | |
846 | break; | |
847 | } | |
848 | ||
849 | return "UNKNOWN"; | |
850 | } | |
851 | ||
852 | void transport_dump_dev_state( | |
853 | struct se_device *dev, | |
854 | char *b, | |
855 | int *bl) | |
856 | { | |
857 | *bl += sprintf(b + *bl, "Status: "); | |
858 | switch (dev->dev_status) { | |
859 | case TRANSPORT_DEVICE_ACTIVATED: | |
860 | *bl += sprintf(b + *bl, "ACTIVATED"); | |
861 | break; | |
862 | case TRANSPORT_DEVICE_DEACTIVATED: | |
863 | *bl += sprintf(b + *bl, "DEACTIVATED"); | |
864 | break; | |
865 | case TRANSPORT_DEVICE_SHUTDOWN: | |
866 | *bl += sprintf(b + *bl, "SHUTDOWN"); | |
867 | break; | |
868 | case TRANSPORT_DEVICE_OFFLINE_ACTIVATED: | |
869 | case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED: | |
870 | *bl += sprintf(b + *bl, "OFFLINE"); | |
871 | break; | |
872 | default: | |
873 | *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status); | |
874 | break; | |
875 | } | |
876 | ||
65586d51 NB |
877 | *bl += sprintf(b + *bl, " Execute/Max Queue Depth: %d/%d", |
878 | atomic_read(&dev->execute_tasks), dev->queue_depth); | |
11e764bd NB |
879 | *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n", |
880 | dev->se_sub_dev->se_dev_attrib.block_size, | |
881 | dev->se_sub_dev->se_dev_attrib.hw_max_sectors); | |
c66ac9db NB |
882 | *bl += sprintf(b + *bl, " "); |
883 | } | |
884 | ||
c66ac9db NB |
885 | void transport_dump_vpd_proto_id( |
886 | struct t10_vpd *vpd, | |
887 | unsigned char *p_buf, | |
888 | int p_buf_len) | |
889 | { | |
890 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
891 | int len; | |
892 | ||
893 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
894 | len = sprintf(buf, "T10 VPD Protocol Identifier: "); | |
895 | ||
896 | switch (vpd->protocol_identifier) { | |
897 | case 0x00: | |
898 | sprintf(buf+len, "Fibre Channel\n"); | |
899 | break; | |
900 | case 0x10: | |
901 | sprintf(buf+len, "Parallel SCSI\n"); | |
902 | break; | |
903 | case 0x20: | |
904 | sprintf(buf+len, "SSA\n"); | |
905 | break; | |
906 | case 0x30: | |
907 | sprintf(buf+len, "IEEE 1394\n"); | |
908 | break; | |
909 | case 0x40: | |
910 | sprintf(buf+len, "SCSI Remote Direct Memory Access" | |
911 | " Protocol\n"); | |
912 | break; | |
913 | case 0x50: | |
914 | sprintf(buf+len, "Internet SCSI (iSCSI)\n"); | |
915 | break; | |
916 | case 0x60: | |
917 | sprintf(buf+len, "SAS Serial SCSI Protocol\n"); | |
918 | break; | |
919 | case 0x70: | |
920 | sprintf(buf+len, "Automation/Drive Interface Transport" | |
921 | " Protocol\n"); | |
922 | break; | |
923 | case 0x80: | |
924 | sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n"); | |
925 | break; | |
926 | default: | |
927 | sprintf(buf+len, "Unknown 0x%02x\n", | |
928 | vpd->protocol_identifier); | |
929 | break; | |
930 | } | |
931 | ||
932 | if (p_buf) | |
933 | strncpy(p_buf, buf, p_buf_len); | |
934 | else | |
6708bb27 | 935 | pr_debug("%s", buf); |
c66ac9db NB |
936 | } |
937 | ||
938 | void | |
939 | transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83) | |
940 | { | |
941 | /* | |
942 | * Check if the Protocol Identifier Valid (PIV) bit is set.. | |
943 | * | |
944 | * from spc3r23.pdf section 7.5.1 | |
945 | */ | |
946 | if (page_83[1] & 0x80) { | |
947 | vpd->protocol_identifier = (page_83[0] & 0xf0); | |
948 | vpd->protocol_identifier_set = 1; | |
949 | transport_dump_vpd_proto_id(vpd, NULL, 0); | |
950 | } | |
951 | } | |
952 | EXPORT_SYMBOL(transport_set_vpd_proto_id); | |
953 | ||
954 | int transport_dump_vpd_assoc( | |
955 | struct t10_vpd *vpd, | |
956 | unsigned char *p_buf, | |
957 | int p_buf_len) | |
958 | { | |
959 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
e3d6f909 AG |
960 | int ret = 0; |
961 | int len; | |
c66ac9db NB |
962 | |
963 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
964 | len = sprintf(buf, "T10 VPD Identifier Association: "); | |
965 | ||
966 | switch (vpd->association) { | |
967 | case 0x00: | |
968 | sprintf(buf+len, "addressed logical unit\n"); | |
969 | break; | |
970 | case 0x10: | |
971 | sprintf(buf+len, "target port\n"); | |
972 | break; | |
973 | case 0x20: | |
974 | sprintf(buf+len, "SCSI target device\n"); | |
975 | break; | |
976 | default: | |
977 | sprintf(buf+len, "Unknown 0x%02x\n", vpd->association); | |
e3d6f909 | 978 | ret = -EINVAL; |
c66ac9db NB |
979 | break; |
980 | } | |
981 | ||
982 | if (p_buf) | |
983 | strncpy(p_buf, buf, p_buf_len); | |
984 | else | |
6708bb27 | 985 | pr_debug("%s", buf); |
c66ac9db NB |
986 | |
987 | return ret; | |
988 | } | |
989 | ||
990 | int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83) | |
991 | { | |
992 | /* | |
993 | * The VPD identification association.. | |
994 | * | |
995 | * from spc3r23.pdf Section 7.6.3.1 Table 297 | |
996 | */ | |
997 | vpd->association = (page_83[1] & 0x30); | |
998 | return transport_dump_vpd_assoc(vpd, NULL, 0); | |
999 | } | |
1000 | EXPORT_SYMBOL(transport_set_vpd_assoc); | |
1001 | ||
1002 | int transport_dump_vpd_ident_type( | |
1003 | struct t10_vpd *vpd, | |
1004 | unsigned char *p_buf, | |
1005 | int p_buf_len) | |
1006 | { | |
1007 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
e3d6f909 AG |
1008 | int ret = 0; |
1009 | int len; | |
c66ac9db NB |
1010 | |
1011 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
1012 | len = sprintf(buf, "T10 VPD Identifier Type: "); | |
1013 | ||
1014 | switch (vpd->device_identifier_type) { | |
1015 | case 0x00: | |
1016 | sprintf(buf+len, "Vendor specific\n"); | |
1017 | break; | |
1018 | case 0x01: | |
1019 | sprintf(buf+len, "T10 Vendor ID based\n"); | |
1020 | break; | |
1021 | case 0x02: | |
1022 | sprintf(buf+len, "EUI-64 based\n"); | |
1023 | break; | |
1024 | case 0x03: | |
1025 | sprintf(buf+len, "NAA\n"); | |
1026 | break; | |
1027 | case 0x04: | |
1028 | sprintf(buf+len, "Relative target port identifier\n"); | |
1029 | break; | |
1030 | case 0x08: | |
1031 | sprintf(buf+len, "SCSI name string\n"); | |
1032 | break; | |
1033 | default: | |
1034 | sprintf(buf+len, "Unsupported: 0x%02x\n", | |
1035 | vpd->device_identifier_type); | |
e3d6f909 | 1036 | ret = -EINVAL; |
c66ac9db NB |
1037 | break; |
1038 | } | |
1039 | ||
e3d6f909 AG |
1040 | if (p_buf) { |
1041 | if (p_buf_len < strlen(buf)+1) | |
1042 | return -EINVAL; | |
c66ac9db | 1043 | strncpy(p_buf, buf, p_buf_len); |
e3d6f909 | 1044 | } else { |
6708bb27 | 1045 | pr_debug("%s", buf); |
e3d6f909 | 1046 | } |
c66ac9db NB |
1047 | |
1048 | return ret; | |
1049 | } | |
1050 | ||
1051 | int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83) | |
1052 | { | |
1053 | /* | |
1054 | * The VPD identifier type.. | |
1055 | * | |
1056 | * from spc3r23.pdf Section 7.6.3.1 Table 298 | |
1057 | */ | |
1058 | vpd->device_identifier_type = (page_83[1] & 0x0f); | |
1059 | return transport_dump_vpd_ident_type(vpd, NULL, 0); | |
1060 | } | |
1061 | EXPORT_SYMBOL(transport_set_vpd_ident_type); | |
1062 | ||
1063 | int transport_dump_vpd_ident( | |
1064 | struct t10_vpd *vpd, | |
1065 | unsigned char *p_buf, | |
1066 | int p_buf_len) | |
1067 | { | |
1068 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
1069 | int ret = 0; | |
1070 | ||
1071 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
1072 | ||
1073 | switch (vpd->device_identifier_code_set) { | |
1074 | case 0x01: /* Binary */ | |
1075 | sprintf(buf, "T10 VPD Binary Device Identifier: %s\n", | |
1076 | &vpd->device_identifier[0]); | |
1077 | break; | |
1078 | case 0x02: /* ASCII */ | |
1079 | sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n", | |
1080 | &vpd->device_identifier[0]); | |
1081 | break; | |
1082 | case 0x03: /* UTF-8 */ | |
1083 | sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n", | |
1084 | &vpd->device_identifier[0]); | |
1085 | break; | |
1086 | default: | |
1087 | sprintf(buf, "T10 VPD Device Identifier encoding unsupported:" | |
1088 | " 0x%02x", vpd->device_identifier_code_set); | |
e3d6f909 | 1089 | ret = -EINVAL; |
c66ac9db NB |
1090 | break; |
1091 | } | |
1092 | ||
1093 | if (p_buf) | |
1094 | strncpy(p_buf, buf, p_buf_len); | |
1095 | else | |
6708bb27 | 1096 | pr_debug("%s", buf); |
c66ac9db NB |
1097 | |
1098 | return ret; | |
1099 | } | |
1100 | ||
1101 | int | |
1102 | transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83) | |
1103 | { | |
1104 | static const char hex_str[] = "0123456789abcdef"; | |
1105 | int j = 0, i = 4; /* offset to start of the identifer */ | |
1106 | ||
1107 | /* | |
1108 | * The VPD Code Set (encoding) | |
1109 | * | |
1110 | * from spc3r23.pdf Section 7.6.3.1 Table 296 | |
1111 | */ | |
1112 | vpd->device_identifier_code_set = (page_83[0] & 0x0f); | |
1113 | switch (vpd->device_identifier_code_set) { | |
1114 | case 0x01: /* Binary */ | |
1115 | vpd->device_identifier[j++] = | |
1116 | hex_str[vpd->device_identifier_type]; | |
1117 | while (i < (4 + page_83[3])) { | |
1118 | vpd->device_identifier[j++] = | |
1119 | hex_str[(page_83[i] & 0xf0) >> 4]; | |
1120 | vpd->device_identifier[j++] = | |
1121 | hex_str[page_83[i] & 0x0f]; | |
1122 | i++; | |
1123 | } | |
1124 | break; | |
1125 | case 0x02: /* ASCII */ | |
1126 | case 0x03: /* UTF-8 */ | |
1127 | while (i < (4 + page_83[3])) | |
1128 | vpd->device_identifier[j++] = page_83[i++]; | |
1129 | break; | |
1130 | default: | |
1131 | break; | |
1132 | } | |
1133 | ||
1134 | return transport_dump_vpd_ident(vpd, NULL, 0); | |
1135 | } | |
1136 | EXPORT_SYMBOL(transport_set_vpd_ident); | |
1137 | ||
1138 | static void core_setup_task_attr_emulation(struct se_device *dev) | |
1139 | { | |
1140 | /* | |
1141 | * If this device is from Target_Core_Mod/pSCSI, disable the | |
1142 | * SAM Task Attribute emulation. | |
1143 | * | |
1144 | * This is currently not available in upsream Linux/SCSI Target | |
1145 | * mode code, and is assumed to be disabled while using TCM/pSCSI. | |
1146 | */ | |
e3d6f909 | 1147 | if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) { |
c66ac9db NB |
1148 | dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH; |
1149 | return; | |
1150 | } | |
1151 | ||
1152 | dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED; | |
6708bb27 | 1153 | pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x" |
e3d6f909 AG |
1154 | " device\n", dev->transport->name, |
1155 | dev->transport->get_device_rev(dev)); | |
c66ac9db NB |
1156 | } |
1157 | ||
1158 | static void scsi_dump_inquiry(struct se_device *dev) | |
1159 | { | |
e3d6f909 | 1160 | struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn; |
e59a41b6 | 1161 | char buf[17]; |
c66ac9db NB |
1162 | int i, device_type; |
1163 | /* | |
1164 | * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer | |
1165 | */ | |
c66ac9db NB |
1166 | for (i = 0; i < 8; i++) |
1167 | if (wwn->vendor[i] >= 0x20) | |
e59a41b6 | 1168 | buf[i] = wwn->vendor[i]; |
c66ac9db | 1169 | else |
e59a41b6 SAS |
1170 | buf[i] = ' '; |
1171 | buf[i] = '\0'; | |
1172 | pr_debug(" Vendor: %s\n", buf); | |
c66ac9db | 1173 | |
c66ac9db NB |
1174 | for (i = 0; i < 16; i++) |
1175 | if (wwn->model[i] >= 0x20) | |
e59a41b6 | 1176 | buf[i] = wwn->model[i]; |
c66ac9db | 1177 | else |
e59a41b6 SAS |
1178 | buf[i] = ' '; |
1179 | buf[i] = '\0'; | |
1180 | pr_debug(" Model: %s\n", buf); | |
c66ac9db | 1181 | |
c66ac9db NB |
1182 | for (i = 0; i < 4; i++) |
1183 | if (wwn->revision[i] >= 0x20) | |
e59a41b6 | 1184 | buf[i] = wwn->revision[i]; |
c66ac9db | 1185 | else |
e59a41b6 SAS |
1186 | buf[i] = ' '; |
1187 | buf[i] = '\0'; | |
1188 | pr_debug(" Revision: %s\n", buf); | |
c66ac9db | 1189 | |
e3d6f909 | 1190 | device_type = dev->transport->get_device_type(dev); |
6708bb27 AG |
1191 | pr_debug(" Type: %s ", scsi_device_type(device_type)); |
1192 | pr_debug(" ANSI SCSI revision: %02x\n", | |
e3d6f909 | 1193 | dev->transport->get_device_rev(dev)); |
c66ac9db NB |
1194 | } |
1195 | ||
1196 | struct se_device *transport_add_device_to_core_hba( | |
1197 | struct se_hba *hba, | |
1198 | struct se_subsystem_api *transport, | |
1199 | struct se_subsystem_dev *se_dev, | |
1200 | u32 device_flags, | |
1201 | void *transport_dev, | |
1202 | struct se_dev_limits *dev_limits, | |
1203 | const char *inquiry_prod, | |
1204 | const char *inquiry_rev) | |
1205 | { | |
12a18bdc | 1206 | int force_pt; |
c66ac9db NB |
1207 | struct se_device *dev; |
1208 | ||
1209 | dev = kzalloc(sizeof(struct se_device), GFP_KERNEL); | |
6708bb27 AG |
1210 | if (!dev) { |
1211 | pr_err("Unable to allocate memory for se_dev_t\n"); | |
c66ac9db NB |
1212 | return NULL; |
1213 | } | |
c66ac9db | 1214 | |
e3d6f909 | 1215 | transport_init_queue_obj(&dev->dev_queue_obj); |
c66ac9db NB |
1216 | dev->dev_flags = device_flags; |
1217 | dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED; | |
5951146d | 1218 | dev->dev_ptr = transport_dev; |
c66ac9db NB |
1219 | dev->se_hba = hba; |
1220 | dev->se_sub_dev = se_dev; | |
1221 | dev->transport = transport; | |
c66ac9db NB |
1222 | INIT_LIST_HEAD(&dev->dev_list); |
1223 | INIT_LIST_HEAD(&dev->dev_sep_list); | |
1224 | INIT_LIST_HEAD(&dev->dev_tmr_list); | |
cf572a96 | 1225 | INIT_LIST_HEAD(&dev->execute_list); |
c66ac9db | 1226 | INIT_LIST_HEAD(&dev->delayed_cmd_list); |
cf572a96 | 1227 | INIT_LIST_HEAD(&dev->state_list); |
07bde79a | 1228 | INIT_LIST_HEAD(&dev->qf_cmd_list); |
c66ac9db NB |
1229 | spin_lock_init(&dev->execute_task_lock); |
1230 | spin_lock_init(&dev->delayed_cmd_lock); | |
c66ac9db NB |
1231 | spin_lock_init(&dev->dev_reservation_lock); |
1232 | spin_lock_init(&dev->dev_status_lock); | |
c66ac9db NB |
1233 | spin_lock_init(&dev->se_port_lock); |
1234 | spin_lock_init(&dev->se_tmr_lock); | |
07bde79a | 1235 | spin_lock_init(&dev->qf_cmd_lock); |
c66ac9db NB |
1236 | atomic_set(&dev->dev_ordered_id, 0); |
1237 | ||
1238 | se_dev_set_default_attribs(dev, dev_limits); | |
1239 | ||
1240 | dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX); | |
1241 | dev->creation_time = get_jiffies_64(); | |
1242 | spin_lock_init(&dev->stats_lock); | |
1243 | ||
1244 | spin_lock(&hba->device_lock); | |
1245 | list_add_tail(&dev->dev_list, &hba->hba_dev_list); | |
1246 | hba->dev_count++; | |
1247 | spin_unlock(&hba->device_lock); | |
1248 | /* | |
1249 | * Setup the SAM Task Attribute emulation for struct se_device | |
1250 | */ | |
1251 | core_setup_task_attr_emulation(dev); | |
1252 | /* | |
1253 | * Force PR and ALUA passthrough emulation with internal object use. | |
1254 | */ | |
1255 | force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE); | |
1256 | /* | |
1257 | * Setup the Reservations infrastructure for struct se_device | |
1258 | */ | |
1259 | core_setup_reservations(dev, force_pt); | |
1260 | /* | |
1261 | * Setup the Asymmetric Logical Unit Assignment for struct se_device | |
1262 | */ | |
1263 | if (core_setup_alua(dev, force_pt) < 0) | |
1264 | goto out; | |
1265 | ||
1266 | /* | |
1267 | * Startup the struct se_device processing thread | |
1268 | */ | |
1269 | dev->process_thread = kthread_run(transport_processing_thread, dev, | |
e3d6f909 | 1270 | "LIO_%s", dev->transport->name); |
c66ac9db | 1271 | if (IS_ERR(dev->process_thread)) { |
6708bb27 | 1272 | pr_err("Unable to create kthread: LIO_%s\n", |
e3d6f909 | 1273 | dev->transport->name); |
c66ac9db NB |
1274 | goto out; |
1275 | } | |
07bde79a NB |
1276 | /* |
1277 | * Setup work_queue for QUEUE_FULL | |
1278 | */ | |
1279 | INIT_WORK(&dev->qf_work_queue, target_qf_do_work); | |
c66ac9db NB |
1280 | /* |
1281 | * Preload the initial INQUIRY const values if we are doing | |
1282 | * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI | |
1283 | * passthrough because this is being provided by the backend LLD. | |
1284 | * This is required so that transport_get_inquiry() copies these | |
1285 | * originals once back into DEV_T10_WWN(dev) for the virtual device | |
1286 | * setup. | |
1287 | */ | |
e3d6f909 | 1288 | if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) { |
f22c1196 | 1289 | if (!inquiry_prod || !inquiry_rev) { |
6708bb27 | 1290 | pr_err("All non TCM/pSCSI plugins require" |
c66ac9db NB |
1291 | " INQUIRY consts\n"); |
1292 | goto out; | |
1293 | } | |
1294 | ||
e3d6f909 AG |
1295 | strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8); |
1296 | strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16); | |
1297 | strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4); | |
c66ac9db NB |
1298 | } |
1299 | scsi_dump_inquiry(dev); | |
1300 | ||
12a18bdc | 1301 | return dev; |
c66ac9db | 1302 | out: |
c66ac9db NB |
1303 | kthread_stop(dev->process_thread); |
1304 | ||
1305 | spin_lock(&hba->device_lock); | |
1306 | list_del(&dev->dev_list); | |
1307 | hba->dev_count--; | |
1308 | spin_unlock(&hba->device_lock); | |
1309 | ||
1310 | se_release_vpd_for_dev(dev); | |
1311 | ||
c66ac9db NB |
1312 | kfree(dev); |
1313 | ||
1314 | return NULL; | |
1315 | } | |
1316 | EXPORT_SYMBOL(transport_add_device_to_core_hba); | |
1317 | ||
1fd032ee | 1318 | int target_cmd_size_check(struct se_cmd *cmd, unsigned int size) |
9b3b8041 CH |
1319 | { |
1320 | struct se_device *dev = cmd->se_dev; | |
1321 | ||
1322 | if (cmd->unknown_data_length) { | |
1323 | cmd->data_length = size; | |
1324 | } else if (size != cmd->data_length) { | |
1325 | pr_warn("TARGET_CORE[%s]: Expected Transfer Length:" | |
1326 | " %u does not match SCSI CDB Length: %u for SAM Opcode:" | |
1327 | " 0x%02x\n", cmd->se_tfo->get_fabric_name(), | |
1328 | cmd->data_length, size, cmd->t_task_cdb[0]); | |
1329 | ||
1330 | cmd->cmd_spdtl = size; | |
1331 | ||
1332 | if (cmd->data_direction == DMA_TO_DEVICE) { | |
1333 | pr_err("Rejecting underflow/overflow" | |
1334 | " WRITE data\n"); | |
1335 | goto out_invalid_cdb_field; | |
1336 | } | |
1337 | /* | |
1338 | * Reject READ_* or WRITE_* with overflow/underflow for | |
1339 | * type SCF_SCSI_DATA_CDB. | |
1340 | */ | |
1341 | if (dev->se_sub_dev->se_dev_attrib.block_size != 512) { | |
1342 | pr_err("Failing OVERFLOW/UNDERFLOW for LBA op" | |
1343 | " CDB on non 512-byte sector setup subsystem" | |
1344 | " plugin: %s\n", dev->transport->name); | |
1345 | /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */ | |
1346 | goto out_invalid_cdb_field; | |
1347 | } | |
1348 | ||
1349 | if (size > cmd->data_length) { | |
1350 | cmd->se_cmd_flags |= SCF_OVERFLOW_BIT; | |
1351 | cmd->residual_count = (size - cmd->data_length); | |
1352 | } else { | |
1353 | cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT; | |
1354 | cmd->residual_count = (cmd->data_length - size); | |
1355 | } | |
1356 | cmd->data_length = size; | |
1357 | } | |
1358 | ||
1359 | return 0; | |
1360 | ||
1361 | out_invalid_cdb_field: | |
1362 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
1363 | cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; | |
1364 | return -EINVAL; | |
1365 | } | |
1366 | ||
c66ac9db NB |
1367 | /* |
1368 | * Used by fabric modules containing a local struct se_cmd within their | |
1369 | * fabric dependent per I/O descriptor. | |
1370 | */ | |
1371 | void transport_init_se_cmd( | |
1372 | struct se_cmd *cmd, | |
1373 | struct target_core_fabric_ops *tfo, | |
1374 | struct se_session *se_sess, | |
1375 | u32 data_length, | |
1376 | int data_direction, | |
1377 | int task_attr, | |
1378 | unsigned char *sense_buffer) | |
1379 | { | |
5951146d AG |
1380 | INIT_LIST_HEAD(&cmd->se_lun_node); |
1381 | INIT_LIST_HEAD(&cmd->se_delayed_node); | |
07bde79a | 1382 | INIT_LIST_HEAD(&cmd->se_qf_node); |
79a7fef2 | 1383 | INIT_LIST_HEAD(&cmd->se_queue_node); |
a17f091d | 1384 | INIT_LIST_HEAD(&cmd->se_cmd_list); |
cf572a96 CH |
1385 | INIT_LIST_HEAD(&cmd->execute_list); |
1386 | INIT_LIST_HEAD(&cmd->state_list); | |
a1d8b49a AG |
1387 | init_completion(&cmd->transport_lun_fe_stop_comp); |
1388 | init_completion(&cmd->transport_lun_stop_comp); | |
1389 | init_completion(&cmd->t_transport_stop_comp); | |
a17f091d | 1390 | init_completion(&cmd->cmd_wait_comp); |
cf572a96 | 1391 | init_completion(&cmd->task_stop_comp); |
a1d8b49a | 1392 | spin_lock_init(&cmd->t_state_lock); |
7d680f3b | 1393 | cmd->transport_state = CMD_T_DEV_ACTIVE; |
c66ac9db NB |
1394 | |
1395 | cmd->se_tfo = tfo; | |
1396 | cmd->se_sess = se_sess; | |
1397 | cmd->data_length = data_length; | |
1398 | cmd->data_direction = data_direction; | |
1399 | cmd->sam_task_attr = task_attr; | |
1400 | cmd->sense_buffer = sense_buffer; | |
cf572a96 CH |
1401 | |
1402 | cmd->state_active = false; | |
c66ac9db NB |
1403 | } |
1404 | EXPORT_SYMBOL(transport_init_se_cmd); | |
1405 | ||
1406 | static int transport_check_alloc_task_attr(struct se_cmd *cmd) | |
1407 | { | |
1408 | /* | |
1409 | * Check if SAM Task Attribute emulation is enabled for this | |
1410 | * struct se_device storage object | |
1411 | */ | |
5951146d | 1412 | if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) |
c66ac9db NB |
1413 | return 0; |
1414 | ||
e66ecd50 | 1415 | if (cmd->sam_task_attr == MSG_ACA_TAG) { |
6708bb27 | 1416 | pr_debug("SAM Task Attribute ACA" |
c66ac9db | 1417 | " emulation is not supported\n"); |
e3d6f909 | 1418 | return -EINVAL; |
c66ac9db NB |
1419 | } |
1420 | /* | |
1421 | * Used to determine when ORDERED commands should go from | |
1422 | * Dormant to Active status. | |
1423 | */ | |
5951146d | 1424 | cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id); |
c66ac9db | 1425 | smp_mb__after_atomic_inc(); |
6708bb27 | 1426 | pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n", |
c66ac9db | 1427 | cmd->se_ordered_id, cmd->sam_task_attr, |
6708bb27 | 1428 | cmd->se_dev->transport->name); |
c66ac9db NB |
1429 | return 0; |
1430 | } | |
1431 | ||
a12f41f8 | 1432 | /* target_setup_cmd_from_cdb(): |
c66ac9db NB |
1433 | * |
1434 | * Called from fabric RX Thread. | |
1435 | */ | |
a12f41f8 | 1436 | int target_setup_cmd_from_cdb( |
c66ac9db NB |
1437 | struct se_cmd *cmd, |
1438 | unsigned char *cdb) | |
1439 | { | |
cb4f4d3c CH |
1440 | struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev; |
1441 | u32 pr_reg_type = 0; | |
1442 | u8 alua_ascq = 0; | |
1443 | unsigned long flags; | |
c66ac9db NB |
1444 | int ret; |
1445 | ||
c66ac9db NB |
1446 | /* |
1447 | * Ensure that the received CDB is less than the max (252 + 8) bytes | |
1448 | * for VARIABLE_LENGTH_CMD | |
1449 | */ | |
1450 | if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) { | |
6708bb27 | 1451 | pr_err("Received SCSI CDB with command_size: %d that" |
c66ac9db NB |
1452 | " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n", |
1453 | scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE); | |
03e98c9e NB |
1454 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; |
1455 | cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; | |
e3d6f909 | 1456 | return -EINVAL; |
c66ac9db NB |
1457 | } |
1458 | /* | |
1459 | * If the received CDB is larger than TCM_MAX_COMMAND_SIZE, | |
1460 | * allocate the additional extended CDB buffer now.. Otherwise | |
1461 | * setup the pointer from __t_task_cdb to t_task_cdb. | |
1462 | */ | |
a1d8b49a AG |
1463 | if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) { |
1464 | cmd->t_task_cdb = kzalloc(scsi_command_size(cdb), | |
c66ac9db | 1465 | GFP_KERNEL); |
6708bb27 AG |
1466 | if (!cmd->t_task_cdb) { |
1467 | pr_err("Unable to allocate cmd->t_task_cdb" | |
a1d8b49a | 1468 | " %u > sizeof(cmd->__t_task_cdb): %lu ops\n", |
c66ac9db | 1469 | scsi_command_size(cdb), |
a1d8b49a | 1470 | (unsigned long)sizeof(cmd->__t_task_cdb)); |
03e98c9e NB |
1471 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; |
1472 | cmd->scsi_sense_reason = | |
1473 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
e3d6f909 | 1474 | return -ENOMEM; |
c66ac9db NB |
1475 | } |
1476 | } else | |
a1d8b49a | 1477 | cmd->t_task_cdb = &cmd->__t_task_cdb[0]; |
c66ac9db | 1478 | /* |
a1d8b49a | 1479 | * Copy the original CDB into cmd-> |
c66ac9db | 1480 | */ |
a1d8b49a | 1481 | memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb)); |
cb4f4d3c CH |
1482 | |
1483 | /* | |
1484 | * Check for an existing UNIT ATTENTION condition | |
1485 | */ | |
1486 | if (core_scsi3_ua_check(cmd, cdb) < 0) { | |
1487 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
1488 | cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION; | |
1489 | return -EINVAL; | |
1490 | } | |
1491 | ||
1492 | ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq); | |
1493 | if (ret != 0) { | |
1494 | /* | |
1495 | * Set SCSI additional sense code (ASC) to 'LUN Not Accessible'; | |
1496 | * The ALUA additional sense code qualifier (ASCQ) is determined | |
1497 | * by the ALUA primary or secondary access state.. | |
1498 | */ | |
1499 | if (ret > 0) { | |
1500 | pr_debug("[%s]: ALUA TG Port not available, " | |
1501 | "SenseKey: NOT_READY, ASC/ASCQ: " | |
1502 | "0x04/0x%02x\n", | |
1503 | cmd->se_tfo->get_fabric_name(), alua_ascq); | |
1504 | ||
1505 | transport_set_sense_codes(cmd, 0x04, alua_ascq); | |
1506 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
1507 | cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY; | |
1508 | return -EINVAL; | |
1509 | } | |
1510 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
1511 | cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; | |
1512 | return -EINVAL; | |
1513 | } | |
1514 | ||
1515 | /* | |
1516 | * Check status for SPC-3 Persistent Reservations | |
1517 | */ | |
1518 | if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type)) { | |
1519 | if (su_dev->t10_pr.pr_ops.t10_seq_non_holder( | |
1520 | cmd, cdb, pr_reg_type) != 0) { | |
1521 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
1522 | cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT; | |
1523 | cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT; | |
1524 | cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; | |
1525 | return -EBUSY; | |
1526 | } | |
1527 | /* | |
1528 | * This means the CDB is allowed for the SCSI Initiator port | |
1529 | * when said port is *NOT* holding the legacy SPC-2 or | |
1530 | * SPC-3 Persistent Reservation. | |
1531 | */ | |
1532 | } | |
1533 | ||
1fd032ee | 1534 | ret = cmd->se_dev->transport->parse_cdb(cmd); |
c66ac9db NB |
1535 | if (ret < 0) |
1536 | return ret; | |
cb4f4d3c CH |
1537 | |
1538 | spin_lock_irqsave(&cmd->t_state_lock, flags); | |
1539 | cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE; | |
1540 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
1541 | ||
c66ac9db NB |
1542 | /* |
1543 | * Check for SAM Task Attribute Emulation | |
1544 | */ | |
1545 | if (transport_check_alloc_task_attr(cmd) < 0) { | |
1546 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
1547 | cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; | |
5951146d | 1548 | return -EINVAL; |
c66ac9db NB |
1549 | } |
1550 | spin_lock(&cmd->se_lun->lun_sep_lock); | |
1551 | if (cmd->se_lun->lun_sep) | |
1552 | cmd->se_lun->lun_sep->sep_stats.cmd_pdus++; | |
1553 | spin_unlock(&cmd->se_lun->lun_sep_lock); | |
1554 | return 0; | |
1555 | } | |
a12f41f8 | 1556 | EXPORT_SYMBOL(target_setup_cmd_from_cdb); |
c66ac9db | 1557 | |
695434e1 NB |
1558 | /* |
1559 | * Used by fabric module frontends to queue tasks directly. | |
1560 | * Many only be used from process context only | |
1561 | */ | |
1562 | int transport_handle_cdb_direct( | |
1563 | struct se_cmd *cmd) | |
1564 | { | |
dd8ae59d NB |
1565 | int ret; |
1566 | ||
695434e1 NB |
1567 | if (!cmd->se_lun) { |
1568 | dump_stack(); | |
6708bb27 | 1569 | pr_err("cmd->se_lun is NULL\n"); |
695434e1 NB |
1570 | return -EINVAL; |
1571 | } | |
1572 | if (in_interrupt()) { | |
1573 | dump_stack(); | |
6708bb27 | 1574 | pr_err("transport_generic_handle_cdb cannot be called" |
695434e1 NB |
1575 | " from interrupt context\n"); |
1576 | return -EINVAL; | |
1577 | } | |
dd8ae59d | 1578 | /* |
7d680f3b | 1579 | * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE following |
dd8ae59d NB |
1580 | * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue() |
1581 | * in existing usage to ensure that outstanding descriptors are handled | |
d14921d6 | 1582 | * correctly during shutdown via transport_wait_for_tasks() |
dd8ae59d NB |
1583 | * |
1584 | * Also, we don't take cmd->t_state_lock here as we only expect | |
1585 | * this to be called for initial descriptor submission. | |
1586 | */ | |
1587 | cmd->t_state = TRANSPORT_NEW_CMD; | |
7d680f3b CH |
1588 | cmd->transport_state |= CMD_T_ACTIVE; |
1589 | ||
dd8ae59d NB |
1590 | /* |
1591 | * transport_generic_new_cmd() is already handling QUEUE_FULL, | |
1592 | * so follow TRANSPORT_NEW_CMD processing thread context usage | |
1593 | * and call transport_generic_request_failure() if necessary.. | |
1594 | */ | |
1595 | ret = transport_generic_new_cmd(cmd); | |
03e98c9e NB |
1596 | if (ret < 0) |
1597 | transport_generic_request_failure(cmd); | |
1598 | ||
dd8ae59d | 1599 | return 0; |
695434e1 NB |
1600 | } |
1601 | EXPORT_SYMBOL(transport_handle_cdb_direct); | |
1602 | ||
a6360785 NB |
1603 | /** |
1604 | * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd | |
1605 | * | |
1606 | * @se_cmd: command descriptor to submit | |
1607 | * @se_sess: associated se_sess for endpoint | |
1608 | * @cdb: pointer to SCSI CDB | |
1609 | * @sense: pointer to SCSI sense buffer | |
1610 | * @unpacked_lun: unpacked LUN to reference for struct se_lun | |
1611 | * @data_length: fabric expected data transfer length | |
1612 | * @task_addr: SAM task attribute | |
1613 | * @data_dir: DMA data direction | |
1614 | * @flags: flags for command submission from target_sc_flags_tables | |
1615 | * | |
1616 | * This may only be called from process context, and also currently | |
1617 | * assumes internal allocation of fabric payload buffer by target-core. | |
1618 | **/ | |
1edcdb49 | 1619 | void target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess, |
a6360785 NB |
1620 | unsigned char *cdb, unsigned char *sense, u32 unpacked_lun, |
1621 | u32 data_length, int task_attr, int data_dir, int flags) | |
1622 | { | |
1623 | struct se_portal_group *se_tpg; | |
1624 | int rc; | |
1625 | ||
1626 | se_tpg = se_sess->se_tpg; | |
1627 | BUG_ON(!se_tpg); | |
1628 | BUG_ON(se_cmd->se_tfo || se_cmd->se_sess); | |
1629 | BUG_ON(in_interrupt()); | |
1630 | /* | |
1631 | * Initialize se_cmd for target operation. From this point | |
1632 | * exceptions are handled by sending exception status via | |
1633 | * target_core_fabric_ops->queue_status() callback | |
1634 | */ | |
1635 | transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, | |
1636 | data_length, data_dir, task_attr, sense); | |
b0d79946 SAS |
1637 | if (flags & TARGET_SCF_UNKNOWN_SIZE) |
1638 | se_cmd->unknown_data_length = 1; | |
a6360785 NB |
1639 | /* |
1640 | * Obtain struct se_cmd->cmd_kref reference and add new cmd to | |
1641 | * se_sess->sess_cmd_list. A second kref_get here is necessary | |
1642 | * for fabrics using TARGET_SCF_ACK_KREF that expect a second | |
1643 | * kref_put() to happen during fabric packet acknowledgement. | |
1644 | */ | |
1645 | target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF)); | |
1646 | /* | |
1647 | * Signal bidirectional data payloads to target-core | |
1648 | */ | |
1649 | if (flags & TARGET_SCF_BIDI_OP) | |
1650 | se_cmd->se_cmd_flags |= SCF_BIDI; | |
1651 | /* | |
1652 | * Locate se_lun pointer and attach it to struct se_cmd | |
1653 | */ | |
735703ca NB |
1654 | if (transport_lookup_cmd_lun(se_cmd, unpacked_lun) < 0) { |
1655 | transport_send_check_condition_and_sense(se_cmd, | |
1656 | se_cmd->scsi_sense_reason, 0); | |
1657 | target_put_sess_cmd(se_sess, se_cmd); | |
1658 | return; | |
1659 | } | |
d6e0175c | 1660 | |
a12f41f8 | 1661 | rc = target_setup_cmd_from_cdb(se_cmd, cdb); |
735703ca NB |
1662 | if (rc != 0) { |
1663 | transport_generic_request_failure(se_cmd); | |
1664 | return; | |
1665 | } | |
11e319ed AG |
1666 | |
1667 | /* | |
1668 | * Check if we need to delay processing because of ALUA | |
1669 | * Active/NonOptimized primary access state.. | |
1670 | */ | |
1671 | core_alua_check_nonop_delay(se_cmd); | |
1672 | ||
a6360785 NB |
1673 | /* |
1674 | * Dispatch se_cmd descriptor to se_lun->lun_se_dev backend | |
1675 | * for immediate execution of READs, otherwise wait for | |
1676 | * transport_generic_handle_data() to be called for WRITEs | |
1677 | * when fabric has filled the incoming buffer. | |
1678 | */ | |
1679 | transport_handle_cdb_direct(se_cmd); | |
1edcdb49 | 1680 | return; |
a6360785 NB |
1681 | } |
1682 | EXPORT_SYMBOL(target_submit_cmd); | |
1683 | ||
9f0d05c2 NB |
1684 | static void target_complete_tmr_failure(struct work_struct *work) |
1685 | { | |
1686 | struct se_cmd *se_cmd = container_of(work, struct se_cmd, work); | |
1687 | ||
1688 | se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST; | |
1689 | se_cmd->se_tfo->queue_tm_rsp(se_cmd); | |
1690 | transport_generic_free_cmd(se_cmd, 0); | |
1691 | } | |
1692 | ||
ea98d7f9 AG |
1693 | /** |
1694 | * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd | |
1695 | * for TMR CDBs | |
1696 | * | |
1697 | * @se_cmd: command descriptor to submit | |
1698 | * @se_sess: associated se_sess for endpoint | |
1699 | * @sense: pointer to SCSI sense buffer | |
1700 | * @unpacked_lun: unpacked LUN to reference for struct se_lun | |
1701 | * @fabric_context: fabric context for TMR req | |
1702 | * @tm_type: Type of TM request | |
c0974f89 NB |
1703 | * @gfp: gfp type for caller |
1704 | * @tag: referenced task tag for TMR_ABORT_TASK | |
c7042cae | 1705 | * @flags: submit cmd flags |
ea98d7f9 AG |
1706 | * |
1707 | * Callable from all contexts. | |
1708 | **/ | |
1709 | ||
c7042cae | 1710 | int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess, |
ea98d7f9 | 1711 | unsigned char *sense, u32 unpacked_lun, |
c0974f89 NB |
1712 | void *fabric_tmr_ptr, unsigned char tm_type, |
1713 | gfp_t gfp, unsigned int tag, int flags) | |
ea98d7f9 AG |
1714 | { |
1715 | struct se_portal_group *se_tpg; | |
1716 | int ret; | |
1717 | ||
1718 | se_tpg = se_sess->se_tpg; | |
1719 | BUG_ON(!se_tpg); | |
1720 | ||
1721 | transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, | |
1722 | 0, DMA_NONE, MSG_SIMPLE_TAG, sense); | |
c7042cae NB |
1723 | /* |
1724 | * FIXME: Currently expect caller to handle se_cmd->se_tmr_req | |
1725 | * allocation failure. | |
1726 | */ | |
c0974f89 | 1727 | ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp); |
c7042cae NB |
1728 | if (ret < 0) |
1729 | return -ENOMEM; | |
ea98d7f9 | 1730 | |
c0974f89 NB |
1731 | if (tm_type == TMR_ABORT_TASK) |
1732 | se_cmd->se_tmr_req->ref_task_tag = tag; | |
1733 | ||
ea98d7f9 AG |
1734 | /* See target_submit_cmd for commentary */ |
1735 | target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF)); | |
1736 | ||
ea98d7f9 AG |
1737 | ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun); |
1738 | if (ret) { | |
9f0d05c2 NB |
1739 | /* |
1740 | * For callback during failure handling, push this work off | |
1741 | * to process context with TMR_LUN_DOES_NOT_EXIST status. | |
1742 | */ | |
1743 | INIT_WORK(&se_cmd->work, target_complete_tmr_failure); | |
1744 | schedule_work(&se_cmd->work); | |
c7042cae | 1745 | return 0; |
ea98d7f9 AG |
1746 | } |
1747 | transport_generic_handle_tmr(se_cmd); | |
c7042cae | 1748 | return 0; |
ea98d7f9 AG |
1749 | } |
1750 | EXPORT_SYMBOL(target_submit_tmr); | |
1751 | ||
c66ac9db NB |
1752 | /* |
1753 | * Used by fabric module frontends defining a TFO->new_cmd_map() caller | |
1754 | * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to | |
1755 | * complete setup in TCM process context w/ TFO->new_cmd_map(). | |
1756 | */ | |
1757 | int transport_generic_handle_cdb_map( | |
1758 | struct se_cmd *cmd) | |
1759 | { | |
e3d6f909 | 1760 | if (!cmd->se_lun) { |
c66ac9db | 1761 | dump_stack(); |
6708bb27 | 1762 | pr_err("cmd->se_lun is NULL\n"); |
e3d6f909 | 1763 | return -EINVAL; |
c66ac9db NB |
1764 | } |
1765 | ||
f7a5cc0b | 1766 | transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP, false); |
c66ac9db NB |
1767 | return 0; |
1768 | } | |
1769 | EXPORT_SYMBOL(transport_generic_handle_cdb_map); | |
1770 | ||
1771 | /* transport_generic_handle_data(): | |
1772 | * | |
1773 | * | |
1774 | */ | |
1775 | int transport_generic_handle_data( | |
1776 | struct se_cmd *cmd) | |
1777 | { | |
1778 | /* | |
1779 | * For the software fabric case, then we assume the nexus is being | |
1780 | * failed/shutdown when signals are pending from the kthread context | |
1781 | * caller, so we return a failure. For the HW target mode case running | |
1782 | * in interrupt code, the signal_pending() check is skipped. | |
1783 | */ | |
1784 | if (!in_interrupt() && signal_pending(current)) | |
e3d6f909 | 1785 | return -EPERM; |
c66ac9db NB |
1786 | /* |
1787 | * If the received CDB has aleady been ABORTED by the generic | |
1788 | * target engine, we now call transport_check_aborted_status() | |
1789 | * to queue any delated TASK_ABORTED status for the received CDB to the | |
25985edc | 1790 | * fabric module as we are expecting no further incoming DATA OUT |
c66ac9db NB |
1791 | * sequences at this point. |
1792 | */ | |
1793 | if (transport_check_aborted_status(cmd, 1) != 0) | |
1794 | return 0; | |
1795 | ||
f7a5cc0b | 1796 | transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE, false); |
c66ac9db NB |
1797 | return 0; |
1798 | } | |
1799 | EXPORT_SYMBOL(transport_generic_handle_data); | |
1800 | ||
1801 | /* transport_generic_handle_tmr(): | |
1802 | * | |
1803 | * | |
1804 | */ | |
1805 | int transport_generic_handle_tmr( | |
1806 | struct se_cmd *cmd) | |
1807 | { | |
f7a5cc0b | 1808 | transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR, false); |
c66ac9db NB |
1809 | return 0; |
1810 | } | |
1811 | EXPORT_SYMBOL(transport_generic_handle_tmr); | |
1812 | ||
cdbb70bb | 1813 | /* |
cf572a96 | 1814 | * If the cmd is active, request it to be stopped and sleep until it |
cdbb70bb CH |
1815 | * has completed. |
1816 | */ | |
cf572a96 | 1817 | bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags) |
cdbb70bb | 1818 | { |
cdbb70bb CH |
1819 | bool was_active = false; |
1820 | ||
cf572a96 CH |
1821 | if (cmd->transport_state & CMD_T_BUSY) { |
1822 | cmd->transport_state |= CMD_T_REQUEST_STOP; | |
cdbb70bb CH |
1823 | spin_unlock_irqrestore(&cmd->t_state_lock, *flags); |
1824 | ||
cf572a96 CH |
1825 | pr_debug("cmd %p waiting to complete\n", cmd); |
1826 | wait_for_completion(&cmd->task_stop_comp); | |
1827 | pr_debug("cmd %p stopped successfully\n", cmd); | |
cdbb70bb CH |
1828 | |
1829 | spin_lock_irqsave(&cmd->t_state_lock, *flags); | |
cf572a96 CH |
1830 | cmd->transport_state &= ~CMD_T_REQUEST_STOP; |
1831 | cmd->transport_state &= ~CMD_T_BUSY; | |
cdbb70bb CH |
1832 | was_active = true; |
1833 | } | |
1834 | ||
cdbb70bb CH |
1835 | return was_active; |
1836 | } | |
1837 | ||
c66ac9db NB |
1838 | /* |
1839 | * Handle SAM-esque emulation for generic transport request failures. | |
1840 | */ | |
2fbff127 | 1841 | void transport_generic_request_failure(struct se_cmd *cmd) |
c66ac9db | 1842 | { |
07bde79a NB |
1843 | int ret = 0; |
1844 | ||
6708bb27 | 1845 | pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x" |
e3d6f909 | 1846 | " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd), |
a1d8b49a | 1847 | cmd->t_task_cdb[0]); |
03e98c9e | 1848 | pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n", |
e3d6f909 | 1849 | cmd->se_tfo->get_cmd_state(cmd), |
03e98c9e | 1850 | cmd->t_state, cmd->scsi_sense_reason); |
d43d6aea | 1851 | pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n", |
7d680f3b CH |
1852 | (cmd->transport_state & CMD_T_ACTIVE) != 0, |
1853 | (cmd->transport_state & CMD_T_STOP) != 0, | |
1854 | (cmd->transport_state & CMD_T_SENT) != 0); | |
c66ac9db | 1855 | |
c66ac9db NB |
1856 | /* |
1857 | * For SAM Task Attribute emulation for failed struct se_cmd | |
1858 | */ | |
1859 | if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) | |
1860 | transport_complete_task_attr(cmd); | |
1861 | ||
03e98c9e NB |
1862 | switch (cmd->scsi_sense_reason) { |
1863 | case TCM_NON_EXISTENT_LUN: | |
1864 | case TCM_UNSUPPORTED_SCSI_OPCODE: | |
1865 | case TCM_INVALID_CDB_FIELD: | |
1866 | case TCM_INVALID_PARAMETER_LIST: | |
1867 | case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE: | |
1868 | case TCM_UNKNOWN_MODE_PAGE: | |
1869 | case TCM_WRITE_PROTECTED: | |
1870 | case TCM_CHECK_CONDITION_ABORT_CMD: | |
1871 | case TCM_CHECK_CONDITION_UNIT_ATTENTION: | |
1872 | case TCM_CHECK_CONDITION_NOT_READY: | |
c66ac9db | 1873 | break; |
03e98c9e | 1874 | case TCM_RESERVATION_CONFLICT: |
c66ac9db NB |
1875 | /* |
1876 | * No SENSE Data payload for this case, set SCSI Status | |
1877 | * and queue the response to $FABRIC_MOD. | |
1878 | * | |
1879 | * Uses linux/include/scsi/scsi.h SAM status codes defs | |
1880 | */ | |
1881 | cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT; | |
1882 | /* | |
1883 | * For UA Interlock Code 11b, a RESERVATION CONFLICT will | |
1884 | * establish a UNIT ATTENTION with PREVIOUS RESERVATION | |
1885 | * CONFLICT STATUS. | |
1886 | * | |
1887 | * See spc4r17, section 7.4.6 Control Mode Page, Table 349 | |
1888 | */ | |
e3d6f909 AG |
1889 | if (cmd->se_sess && |
1890 | cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2) | |
1891 | core_scsi3_ua_allocate(cmd->se_sess->se_node_acl, | |
c66ac9db NB |
1892 | cmd->orig_fe_lun, 0x2C, |
1893 | ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS); | |
1894 | ||
07bde79a | 1895 | ret = cmd->se_tfo->queue_status(cmd); |
f147abb4 | 1896 | if (ret == -EAGAIN || ret == -ENOMEM) |
07bde79a | 1897 | goto queue_full; |
c66ac9db | 1898 | goto check_stop; |
c66ac9db | 1899 | default: |
6708bb27 | 1900 | pr_err("Unknown transport error for CDB 0x%02x: %d\n", |
03e98c9e | 1901 | cmd->t_task_cdb[0], cmd->scsi_sense_reason); |
c66ac9db NB |
1902 | cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; |
1903 | break; | |
1904 | } | |
16ab8e60 NB |
1905 | /* |
1906 | * If a fabric does not define a cmd->se_tfo->new_cmd_map caller, | |
1907 | * make the call to transport_send_check_condition_and_sense() | |
1908 | * directly. Otherwise expect the fabric to make the call to | |
1909 | * transport_send_check_condition_and_sense() after handling | |
1910 | * possible unsoliticied write data payloads. | |
1911 | */ | |
03e98c9e NB |
1912 | ret = transport_send_check_condition_and_sense(cmd, |
1913 | cmd->scsi_sense_reason, 0); | |
1914 | if (ret == -EAGAIN || ret == -ENOMEM) | |
1915 | goto queue_full; | |
07bde79a | 1916 | |
c66ac9db NB |
1917 | check_stop: |
1918 | transport_lun_remove_cmd(cmd); | |
6708bb27 | 1919 | if (!transport_cmd_check_stop_to_fabric(cmd)) |
c66ac9db | 1920 | ; |
07bde79a NB |
1921 | return; |
1922 | ||
1923 | queue_full: | |
e057f533 CH |
1924 | cmd->t_state = TRANSPORT_COMPLETE_QF_OK; |
1925 | transport_handle_queue_full(cmd, cmd->se_dev); | |
c66ac9db | 1926 | } |
2fbff127 | 1927 | EXPORT_SYMBOL(transport_generic_request_failure); |
c66ac9db | 1928 | |
c66ac9db NB |
1929 | /* |
1930 | * Called from Fabric Module context from transport_execute_tasks() | |
1931 | * | |
1932 | * The return of this function determins if the tasks from struct se_cmd | |
1933 | * get added to the execution queue in transport_execute_tasks(), | |
1934 | * or are added to the delayed or ordered lists here. | |
1935 | */ | |
1936 | static inline int transport_execute_task_attr(struct se_cmd *cmd) | |
1937 | { | |
5951146d | 1938 | if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) |
c66ac9db NB |
1939 | return 1; |
1940 | /* | |
25985edc | 1941 | * Check for the existence of HEAD_OF_QUEUE, and if true return 1 |
c66ac9db NB |
1942 | * to allow the passed struct se_cmd list of tasks to the front of the list. |
1943 | */ | |
e66ecd50 | 1944 | if (cmd->sam_task_attr == MSG_HEAD_TAG) { |
6708bb27 | 1945 | pr_debug("Added HEAD_OF_QUEUE for CDB:" |
c66ac9db | 1946 | " 0x%02x, se_ordered_id: %u\n", |
6708bb27 | 1947 | cmd->t_task_cdb[0], |
c66ac9db NB |
1948 | cmd->se_ordered_id); |
1949 | return 1; | |
e66ecd50 | 1950 | } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) { |
5951146d | 1951 | atomic_inc(&cmd->se_dev->dev_ordered_sync); |
c66ac9db NB |
1952 | smp_mb__after_atomic_inc(); |
1953 | ||
6708bb27 | 1954 | pr_debug("Added ORDERED for CDB: 0x%02x to ordered" |
c66ac9db | 1955 | " list, se_ordered_id: %u\n", |
a1d8b49a | 1956 | cmd->t_task_cdb[0], |
c66ac9db NB |
1957 | cmd->se_ordered_id); |
1958 | /* | |
1959 | * Add ORDERED command to tail of execution queue if | |
1960 | * no other older commands exist that need to be | |
1961 | * completed first. | |
1962 | */ | |
6708bb27 | 1963 | if (!atomic_read(&cmd->se_dev->simple_cmds)) |
c66ac9db NB |
1964 | return 1; |
1965 | } else { | |
1966 | /* | |
1967 | * For SIMPLE and UNTAGGED Task Attribute commands | |
1968 | */ | |
5951146d | 1969 | atomic_inc(&cmd->se_dev->simple_cmds); |
c66ac9db NB |
1970 | smp_mb__after_atomic_inc(); |
1971 | } | |
1972 | /* | |
1973 | * Otherwise if one or more outstanding ORDERED task attribute exist, | |
1974 | * add the dormant task(s) built for the passed struct se_cmd to the | |
1975 | * execution queue and become in Active state for this struct se_device. | |
1976 | */ | |
5951146d | 1977 | if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) { |
c66ac9db NB |
1978 | /* |
1979 | * Otherwise, add cmd w/ tasks to delayed cmd queue that | |
25985edc | 1980 | * will be drained upon completion of HEAD_OF_QUEUE task. |
c66ac9db | 1981 | */ |
5951146d | 1982 | spin_lock(&cmd->se_dev->delayed_cmd_lock); |
c66ac9db | 1983 | cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR; |
5951146d AG |
1984 | list_add_tail(&cmd->se_delayed_node, |
1985 | &cmd->se_dev->delayed_cmd_list); | |
1986 | spin_unlock(&cmd->se_dev->delayed_cmd_lock); | |
c66ac9db | 1987 | |
6708bb27 | 1988 | pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to" |
c66ac9db | 1989 | " delayed CMD list, se_ordered_id: %u\n", |
a1d8b49a | 1990 | cmd->t_task_cdb[0], cmd->sam_task_attr, |
c66ac9db NB |
1991 | cmd->se_ordered_id); |
1992 | /* | |
1993 | * Return zero to let transport_execute_tasks() know | |
1994 | * not to add the delayed tasks to the execution list. | |
1995 | */ | |
1996 | return 0; | |
1997 | } | |
1998 | /* | |
1999 | * Otherwise, no ORDERED task attributes exist.. | |
2000 | */ | |
2001 | return 1; | |
2002 | } | |
2003 | ||
2004 | /* | |
2005 | * Called from fabric module context in transport_generic_new_cmd() and | |
2006 | * transport_generic_process_write() | |
2007 | */ | |
d28d96dc | 2008 | static void transport_execute_tasks(struct se_cmd *cmd) |
c66ac9db NB |
2009 | { |
2010 | int add_tasks; | |
40be67f4 | 2011 | struct se_device *se_dev = cmd->se_dev; |
c66ac9db NB |
2012 | /* |
2013 | * Call transport_cmd_check_stop() to see if a fabric exception | |
25985edc | 2014 | * has occurred that prevents execution. |
c66ac9db | 2015 | */ |
6708bb27 | 2016 | if (!transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING)) { |
c66ac9db NB |
2017 | /* |
2018 | * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE | |
2019 | * attribute for the tasks of the received struct se_cmd CDB | |
2020 | */ | |
2021 | add_tasks = transport_execute_task_attr(cmd); | |
d28d96dc JE |
2022 | if (add_tasks) { |
2023 | __transport_execute_tasks(se_dev, cmd); | |
2024 | return; | |
2025 | } | |
c66ac9db | 2026 | } |
4d2300cc | 2027 | __transport_execute_tasks(se_dev, NULL); |
c66ac9db NB |
2028 | } |
2029 | ||
4d2300cc | 2030 | static int __transport_execute_tasks(struct se_device *dev, struct se_cmd *new_cmd) |
c66ac9db NB |
2031 | { |
2032 | int error; | |
2033 | struct se_cmd *cmd = NULL; | |
c66ac9db NB |
2034 | unsigned long flags; |
2035 | ||
c66ac9db | 2036 | check_depth: |
e3d6f909 | 2037 | spin_lock_irq(&dev->execute_task_lock); |
4d2300cc | 2038 | if (new_cmd != NULL) |
cf572a96 | 2039 | __target_add_to_execute_list(new_cmd); |
4d2300cc | 2040 | |
cf572a96 | 2041 | if (list_empty(&dev->execute_list)) { |
e3d6f909 | 2042 | spin_unlock_irq(&dev->execute_task_lock); |
c66ac9db NB |
2043 | return 0; |
2044 | } | |
cf572a96 CH |
2045 | cmd = list_first_entry(&dev->execute_list, struct se_cmd, execute_list); |
2046 | __target_remove_from_execute_list(cmd); | |
e3d6f909 | 2047 | spin_unlock_irq(&dev->execute_task_lock); |
c66ac9db | 2048 | |
a1d8b49a | 2049 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
cf572a96 | 2050 | cmd->transport_state |= CMD_T_BUSY; |
785fdf70 | 2051 | cmd->transport_state |= CMD_T_SENT; |
c66ac9db | 2052 | |
a1d8b49a | 2053 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 2054 | |
6bb35e00 CH |
2055 | if (cmd->execute_cmd) |
2056 | error = cmd->execute_cmd(cmd); | |
5787cacd CH |
2057 | else { |
2058 | error = dev->transport->execute_cmd(cmd, cmd->t_data_sg, | |
2059 | cmd->t_data_nents, cmd->data_direction); | |
2060 | } | |
cf572a96 | 2061 | |
d29a5b6a | 2062 | if (error != 0) { |
d29a5b6a | 2063 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
cf572a96 | 2064 | cmd->transport_state &= ~CMD_T_BUSY; |
7d680f3b | 2065 | cmd->transport_state &= ~CMD_T_SENT; |
d29a5b6a | 2066 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
7d680f3b | 2067 | |
03e98c9e | 2068 | transport_generic_request_failure(cmd); |
c66ac9db NB |
2069 | } |
2070 | ||
4d2300cc | 2071 | new_cmd = NULL; |
c66ac9db NB |
2072 | goto check_depth; |
2073 | ||
2074 | return 0; | |
2075 | } | |
2076 | ||
c66ac9db NB |
2077 | /* |
2078 | * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd | |
2079 | */ | |
2080 | static int transport_get_sense_data(struct se_cmd *cmd) | |
2081 | { | |
2082 | unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL; | |
42bf829e | 2083 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
2084 | unsigned long flags; |
2085 | u32 offset = 0; | |
2086 | ||
e3d6f909 AG |
2087 | WARN_ON(!cmd->se_lun); |
2088 | ||
42bf829e CH |
2089 | if (!dev) |
2090 | return 0; | |
2091 | ||
a1d8b49a | 2092 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 2093 | if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) { |
a1d8b49a | 2094 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
2095 | return 0; |
2096 | } | |
2097 | ||
cf572a96 CH |
2098 | if (!(cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)) |
2099 | goto out; | |
c66ac9db | 2100 | |
cf572a96 CH |
2101 | if (!dev->transport->get_sense_buffer) { |
2102 | pr_err("dev->transport->get_sense_buffer is NULL\n"); | |
2103 | goto out; | |
2104 | } | |
c66ac9db | 2105 | |
5787cacd | 2106 | sense_buffer = dev->transport->get_sense_buffer(cmd); |
cf572a96 | 2107 | if (!sense_buffer) { |
5787cacd | 2108 | pr_err("ITT 0x%08x cmd %p: Unable to locate" |
cf572a96 | 2109 | " sense buffer for task with sense\n", |
5787cacd | 2110 | cmd->se_tfo->get_task_tag(cmd), cmd); |
cf572a96 | 2111 | goto out; |
c66ac9db | 2112 | } |
5787cacd | 2113 | |
cf572a96 CH |
2114 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
2115 | ||
2116 | offset = cmd->se_tfo->set_fabric_sense_len(cmd, TRANSPORT_SENSE_BUFFER); | |
2117 | ||
2118 | memcpy(&buffer[offset], sense_buffer, TRANSPORT_SENSE_BUFFER); | |
cf572a96 CH |
2119 | |
2120 | /* Automatically padded */ | |
2121 | cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset; | |
2122 | ||
2123 | pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x and sense\n", | |
2124 | dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status); | |
2125 | return 0; | |
2126 | ||
785fdf70 | 2127 | out: |
a1d8b49a | 2128 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
2129 | return -1; |
2130 | } | |
2131 | ||
c66ac9db | 2132 | /* |
35e0e757 | 2133 | * Called from I/O completion to determine which dormant/delayed |
c66ac9db NB |
2134 | * and ordered cmds need to have their tasks added to the execution queue. |
2135 | */ | |
2136 | static void transport_complete_task_attr(struct se_cmd *cmd) | |
2137 | { | |
5951146d | 2138 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
2139 | struct se_cmd *cmd_p, *cmd_tmp; |
2140 | int new_active_tasks = 0; | |
2141 | ||
e66ecd50 | 2142 | if (cmd->sam_task_attr == MSG_SIMPLE_TAG) { |
c66ac9db NB |
2143 | atomic_dec(&dev->simple_cmds); |
2144 | smp_mb__after_atomic_dec(); | |
2145 | dev->dev_cur_ordered_id++; | |
6708bb27 | 2146 | pr_debug("Incremented dev->dev_cur_ordered_id: %u for" |
c66ac9db NB |
2147 | " SIMPLE: %u\n", dev->dev_cur_ordered_id, |
2148 | cmd->se_ordered_id); | |
e66ecd50 | 2149 | } else if (cmd->sam_task_attr == MSG_HEAD_TAG) { |
c66ac9db | 2150 | dev->dev_cur_ordered_id++; |
6708bb27 | 2151 | pr_debug("Incremented dev_cur_ordered_id: %u for" |
c66ac9db NB |
2152 | " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id, |
2153 | cmd->se_ordered_id); | |
e66ecd50 | 2154 | } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) { |
c66ac9db NB |
2155 | atomic_dec(&dev->dev_ordered_sync); |
2156 | smp_mb__after_atomic_dec(); | |
c66ac9db NB |
2157 | |
2158 | dev->dev_cur_ordered_id++; | |
6708bb27 | 2159 | pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:" |
c66ac9db NB |
2160 | " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id); |
2161 | } | |
2162 | /* | |
2163 | * Process all commands up to the last received | |
2164 | * ORDERED task attribute which requires another blocking | |
2165 | * boundary | |
2166 | */ | |
2167 | spin_lock(&dev->delayed_cmd_lock); | |
2168 | list_for_each_entry_safe(cmd_p, cmd_tmp, | |
5951146d | 2169 | &dev->delayed_cmd_list, se_delayed_node) { |
c66ac9db | 2170 | |
5951146d | 2171 | list_del(&cmd_p->se_delayed_node); |
c66ac9db NB |
2172 | spin_unlock(&dev->delayed_cmd_lock); |
2173 | ||
6708bb27 | 2174 | pr_debug("Calling add_tasks() for" |
c66ac9db NB |
2175 | " cmd_p: 0x%02x Task Attr: 0x%02x" |
2176 | " Dormant -> Active, se_ordered_id: %u\n", | |
6708bb27 | 2177 | cmd_p->t_task_cdb[0], |
c66ac9db NB |
2178 | cmd_p->sam_task_attr, cmd_p->se_ordered_id); |
2179 | ||
cf572a96 | 2180 | target_add_to_execute_list(cmd_p); |
c66ac9db NB |
2181 | new_active_tasks++; |
2182 | ||
2183 | spin_lock(&dev->delayed_cmd_lock); | |
e66ecd50 | 2184 | if (cmd_p->sam_task_attr == MSG_ORDERED_TAG) |
c66ac9db NB |
2185 | break; |
2186 | } | |
2187 | spin_unlock(&dev->delayed_cmd_lock); | |
2188 | /* | |
2189 | * If new tasks have become active, wake up the transport thread | |
2190 | * to do the processing of the Active tasks. | |
2191 | */ | |
2192 | if (new_active_tasks != 0) | |
e3d6f909 | 2193 | wake_up_interruptible(&dev->dev_queue_obj.thread_wq); |
c66ac9db NB |
2194 | } |
2195 | ||
e057f533 | 2196 | static void transport_complete_qf(struct se_cmd *cmd) |
07bde79a NB |
2197 | { |
2198 | int ret = 0; | |
2199 | ||
e057f533 CH |
2200 | if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) |
2201 | transport_complete_task_attr(cmd); | |
2202 | ||
2203 | if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) { | |
2204 | ret = cmd->se_tfo->queue_status(cmd); | |
2205 | if (ret) | |
2206 | goto out; | |
2207 | } | |
07bde79a NB |
2208 | |
2209 | switch (cmd->data_direction) { | |
2210 | case DMA_FROM_DEVICE: | |
2211 | ret = cmd->se_tfo->queue_data_in(cmd); | |
2212 | break; | |
2213 | case DMA_TO_DEVICE: | |
ec98f782 | 2214 | if (cmd->t_bidi_data_sg) { |
07bde79a NB |
2215 | ret = cmd->se_tfo->queue_data_in(cmd); |
2216 | if (ret < 0) | |
e057f533 | 2217 | break; |
07bde79a NB |
2218 | } |
2219 | /* Fall through for DMA_TO_DEVICE */ | |
2220 | case DMA_NONE: | |
2221 | ret = cmd->se_tfo->queue_status(cmd); | |
2222 | break; | |
2223 | default: | |
2224 | break; | |
2225 | } | |
2226 | ||
e057f533 CH |
2227 | out: |
2228 | if (ret < 0) { | |
2229 | transport_handle_queue_full(cmd, cmd->se_dev); | |
2230 | return; | |
2231 | } | |
2232 | transport_lun_remove_cmd(cmd); | |
2233 | transport_cmd_check_stop_to_fabric(cmd); | |
07bde79a NB |
2234 | } |
2235 | ||
2236 | static void transport_handle_queue_full( | |
2237 | struct se_cmd *cmd, | |
e057f533 | 2238 | struct se_device *dev) |
07bde79a NB |
2239 | { |
2240 | spin_lock_irq(&dev->qf_cmd_lock); | |
07bde79a NB |
2241 | list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list); |
2242 | atomic_inc(&dev->dev_qf_count); | |
2243 | smp_mb__after_atomic_inc(); | |
2244 | spin_unlock_irq(&cmd->se_dev->qf_cmd_lock); | |
2245 | ||
2246 | schedule_work(&cmd->se_dev->qf_work_queue); | |
2247 | } | |
2248 | ||
35e0e757 | 2249 | static void target_complete_ok_work(struct work_struct *work) |
c66ac9db | 2250 | { |
35e0e757 | 2251 | struct se_cmd *cmd = container_of(work, struct se_cmd, work); |
07bde79a | 2252 | int reason = 0, ret; |
35e0e757 | 2253 | |
c66ac9db NB |
2254 | /* |
2255 | * Check if we need to move delayed/dormant tasks from cmds on the | |
2256 | * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task | |
2257 | * Attribute. | |
2258 | */ | |
5951146d | 2259 | if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) |
c66ac9db | 2260 | transport_complete_task_attr(cmd); |
07bde79a NB |
2261 | /* |
2262 | * Check to schedule QUEUE_FULL work, or execute an existing | |
2263 | * cmd->transport_qf_callback() | |
2264 | */ | |
2265 | if (atomic_read(&cmd->se_dev->dev_qf_count) != 0) | |
2266 | schedule_work(&cmd->se_dev->qf_work_queue); | |
2267 | ||
c66ac9db NB |
2268 | /* |
2269 | * Check if we need to retrieve a sense buffer from | |
2270 | * the struct se_cmd in question. | |
2271 | */ | |
2272 | if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) { | |
2273 | if (transport_get_sense_data(cmd) < 0) | |
2274 | reason = TCM_NON_EXISTENT_LUN; | |
2275 | ||
c66ac9db | 2276 | if (cmd->scsi_status) { |
07bde79a | 2277 | ret = transport_send_check_condition_and_sense( |
c66ac9db | 2278 | cmd, reason, 1); |
f147abb4 | 2279 | if (ret == -EAGAIN || ret == -ENOMEM) |
07bde79a NB |
2280 | goto queue_full; |
2281 | ||
c66ac9db NB |
2282 | transport_lun_remove_cmd(cmd); |
2283 | transport_cmd_check_stop_to_fabric(cmd); | |
2284 | return; | |
2285 | } | |
2286 | } | |
2287 | /* | |
25985edc | 2288 | * Check for a callback, used by amongst other things |
c66ac9db NB |
2289 | * XDWRITE_READ_10 emulation. |
2290 | */ | |
2291 | if (cmd->transport_complete_callback) | |
2292 | cmd->transport_complete_callback(cmd); | |
2293 | ||
2294 | switch (cmd->data_direction) { | |
2295 | case DMA_FROM_DEVICE: | |
2296 | spin_lock(&cmd->se_lun->lun_sep_lock); | |
e3d6f909 AG |
2297 | if (cmd->se_lun->lun_sep) { |
2298 | cmd->se_lun->lun_sep->sep_stats.tx_data_octets += | |
c66ac9db NB |
2299 | cmd->data_length; |
2300 | } | |
2301 | spin_unlock(&cmd->se_lun->lun_sep_lock); | |
c66ac9db | 2302 | |
07bde79a | 2303 | ret = cmd->se_tfo->queue_data_in(cmd); |
f147abb4 | 2304 | if (ret == -EAGAIN || ret == -ENOMEM) |
07bde79a | 2305 | goto queue_full; |
c66ac9db NB |
2306 | break; |
2307 | case DMA_TO_DEVICE: | |
2308 | spin_lock(&cmd->se_lun->lun_sep_lock); | |
e3d6f909 AG |
2309 | if (cmd->se_lun->lun_sep) { |
2310 | cmd->se_lun->lun_sep->sep_stats.rx_data_octets += | |
c66ac9db NB |
2311 | cmd->data_length; |
2312 | } | |
2313 | spin_unlock(&cmd->se_lun->lun_sep_lock); | |
2314 | /* | |
2315 | * Check if we need to send READ payload for BIDI-COMMAND | |
2316 | */ | |
ec98f782 | 2317 | if (cmd->t_bidi_data_sg) { |
c66ac9db | 2318 | spin_lock(&cmd->se_lun->lun_sep_lock); |
e3d6f909 AG |
2319 | if (cmd->se_lun->lun_sep) { |
2320 | cmd->se_lun->lun_sep->sep_stats.tx_data_octets += | |
c66ac9db NB |
2321 | cmd->data_length; |
2322 | } | |
2323 | spin_unlock(&cmd->se_lun->lun_sep_lock); | |
07bde79a | 2324 | ret = cmd->se_tfo->queue_data_in(cmd); |
f147abb4 | 2325 | if (ret == -EAGAIN || ret == -ENOMEM) |
07bde79a | 2326 | goto queue_full; |
c66ac9db NB |
2327 | break; |
2328 | } | |
2329 | /* Fall through for DMA_TO_DEVICE */ | |
2330 | case DMA_NONE: | |
07bde79a | 2331 | ret = cmd->se_tfo->queue_status(cmd); |
f147abb4 | 2332 | if (ret == -EAGAIN || ret == -ENOMEM) |
07bde79a | 2333 | goto queue_full; |
c66ac9db NB |
2334 | break; |
2335 | default: | |
2336 | break; | |
2337 | } | |
2338 | ||
2339 | transport_lun_remove_cmd(cmd); | |
2340 | transport_cmd_check_stop_to_fabric(cmd); | |
07bde79a NB |
2341 | return; |
2342 | ||
2343 | queue_full: | |
6708bb27 | 2344 | pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p," |
07bde79a | 2345 | " data_direction: %d\n", cmd, cmd->data_direction); |
e057f533 CH |
2346 | cmd->t_state = TRANSPORT_COMPLETE_QF_OK; |
2347 | transport_handle_queue_full(cmd, cmd->se_dev); | |
c66ac9db NB |
2348 | } |
2349 | ||
6708bb27 | 2350 | static inline void transport_free_sgl(struct scatterlist *sgl, int nents) |
c66ac9db | 2351 | { |
ec98f782 | 2352 | struct scatterlist *sg; |
ec98f782 | 2353 | int count; |
c66ac9db | 2354 | |
6708bb27 AG |
2355 | for_each_sg(sgl, sg, nents, count) |
2356 | __free_page(sg_page(sg)); | |
c66ac9db | 2357 | |
6708bb27 AG |
2358 | kfree(sgl); |
2359 | } | |
c66ac9db | 2360 | |
6708bb27 AG |
2361 | static inline void transport_free_pages(struct se_cmd *cmd) |
2362 | { | |
2363 | if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) | |
2364 | return; | |
2365 | ||
2366 | transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents); | |
ec98f782 AG |
2367 | cmd->t_data_sg = NULL; |
2368 | cmd->t_data_nents = 0; | |
c66ac9db | 2369 | |
6708bb27 | 2370 | transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents); |
ec98f782 AG |
2371 | cmd->t_bidi_data_sg = NULL; |
2372 | cmd->t_bidi_data_nents = 0; | |
c66ac9db NB |
2373 | } |
2374 | ||
e26d99ae CH |
2375 | /** |
2376 | * transport_release_cmd - free a command | |
2377 | * @cmd: command to free | |
2378 | * | |
2379 | * This routine unconditionally frees a command, and reference counting | |
2380 | * or list removal must be done in the caller. | |
2381 | */ | |
2382 | static void transport_release_cmd(struct se_cmd *cmd) | |
2383 | { | |
2384 | BUG_ON(!cmd->se_tfo); | |
2385 | ||
c8e31f26 | 2386 | if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB) |
e26d99ae CH |
2387 | core_tmr_release_req(cmd->se_tmr_req); |
2388 | if (cmd->t_task_cdb != cmd->__t_task_cdb) | |
2389 | kfree(cmd->t_task_cdb); | |
2390 | /* | |
7481deb4 NB |
2391 | * If this cmd has been setup with target_get_sess_cmd(), drop |
2392 | * the kref and call ->release_cmd() in kref callback. | |
e26d99ae | 2393 | */ |
7481deb4 NB |
2394 | if (cmd->check_release != 0) { |
2395 | target_put_sess_cmd(cmd->se_sess, cmd); | |
2396 | return; | |
2397 | } | |
e26d99ae CH |
2398 | cmd->se_tfo->release_cmd(cmd); |
2399 | } | |
2400 | ||
d3df7825 CH |
2401 | /** |
2402 | * transport_put_cmd - release a reference to a command | |
2403 | * @cmd: command to release | |
2404 | * | |
2405 | * This routine releases our reference to the command and frees it if possible. | |
2406 | */ | |
39c05f32 | 2407 | static void transport_put_cmd(struct se_cmd *cmd) |
c66ac9db NB |
2408 | { |
2409 | unsigned long flags; | |
c66ac9db | 2410 | |
a1d8b49a | 2411 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
4911e3cc CH |
2412 | if (atomic_read(&cmd->t_fe_count)) { |
2413 | if (!atomic_dec_and_test(&cmd->t_fe_count)) | |
2414 | goto out_busy; | |
2415 | } | |
2416 | ||
7d680f3b CH |
2417 | if (cmd->transport_state & CMD_T_DEV_ACTIVE) { |
2418 | cmd->transport_state &= ~CMD_T_DEV_ACTIVE; | |
cf572a96 | 2419 | target_remove_from_state_list(cmd); |
c66ac9db | 2420 | } |
a1d8b49a | 2421 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 2422 | |
c66ac9db | 2423 | transport_free_pages(cmd); |
31afc39c | 2424 | transport_release_cmd(cmd); |
39c05f32 | 2425 | return; |
4911e3cc CH |
2426 | out_busy: |
2427 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
c66ac9db NB |
2428 | } |
2429 | ||
c66ac9db | 2430 | /* |
ec98f782 AG |
2431 | * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of |
2432 | * allocating in the core. | |
c66ac9db NB |
2433 | * @cmd: Associated se_cmd descriptor |
2434 | * @mem: SGL style memory for TCM WRITE / READ | |
2435 | * @sg_mem_num: Number of SGL elements | |
2436 | * @mem_bidi_in: SGL style memory for TCM BIDI READ | |
2437 | * @sg_mem_bidi_num: Number of BIDI READ SGL elements | |
2438 | * | |
2439 | * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage | |
2440 | * of parameters. | |
2441 | */ | |
2442 | int transport_generic_map_mem_to_cmd( | |
2443 | struct se_cmd *cmd, | |
5951146d AG |
2444 | struct scatterlist *sgl, |
2445 | u32 sgl_count, | |
2446 | struct scatterlist *sgl_bidi, | |
2447 | u32 sgl_bidi_count) | |
c66ac9db | 2448 | { |
5951146d | 2449 | if (!sgl || !sgl_count) |
c66ac9db | 2450 | return 0; |
c66ac9db | 2451 | |
64f1db38 CH |
2452 | /* |
2453 | * Reject SCSI data overflow with map_mem_to_cmd() as incoming | |
2454 | * scatterlists already have been set to follow what the fabric | |
2455 | * passes for the original expected data transfer length. | |
2456 | */ | |
2457 | if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) { | |
2458 | pr_warn("Rejecting SCSI DATA overflow for fabric using" | |
2459 | " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n"); | |
2460 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
2461 | cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; | |
2462 | return -EINVAL; | |
2463 | } | |
c66ac9db | 2464 | |
64f1db38 CH |
2465 | cmd->t_data_sg = sgl; |
2466 | cmd->t_data_nents = sgl_count; | |
c66ac9db | 2467 | |
64f1db38 CH |
2468 | if (sgl_bidi && sgl_bidi_count) { |
2469 | cmd->t_bidi_data_sg = sgl_bidi; | |
2470 | cmd->t_bidi_data_nents = sgl_bidi_count; | |
c66ac9db | 2471 | } |
64f1db38 | 2472 | cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC; |
c66ac9db NB |
2473 | return 0; |
2474 | } | |
2475 | EXPORT_SYMBOL(transport_generic_map_mem_to_cmd); | |
2476 | ||
4949314c | 2477 | void *transport_kmap_data_sg(struct se_cmd *cmd) |
05d1c7c0 | 2478 | { |
ec98f782 | 2479 | struct scatterlist *sg = cmd->t_data_sg; |
4949314c AG |
2480 | struct page **pages; |
2481 | int i; | |
05d1c7c0 | 2482 | |
ec98f782 | 2483 | BUG_ON(!sg); |
05d1c7c0 | 2484 | /* |
ec98f782 AG |
2485 | * We need to take into account a possible offset here for fabrics like |
2486 | * tcm_loop who may be using a contig buffer from the SCSI midlayer for | |
2487 | * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd() | |
05d1c7c0 | 2488 | */ |
4949314c AG |
2489 | if (!cmd->t_data_nents) |
2490 | return NULL; | |
2491 | else if (cmd->t_data_nents == 1) | |
2492 | return kmap(sg_page(sg)) + sg->offset; | |
2493 | ||
2494 | /* >1 page. use vmap */ | |
2495 | pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL); | |
2496 | if (!pages) | |
2497 | return NULL; | |
2498 | ||
2499 | /* convert sg[] to pages[] */ | |
2500 | for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) { | |
2501 | pages[i] = sg_page(sg); | |
2502 | } | |
2503 | ||
2504 | cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL); | |
2505 | kfree(pages); | |
2506 | if (!cmd->t_data_vmap) | |
2507 | return NULL; | |
2508 | ||
2509 | return cmd->t_data_vmap + cmd->t_data_sg[0].offset; | |
05d1c7c0 | 2510 | } |
4949314c | 2511 | EXPORT_SYMBOL(transport_kmap_data_sg); |
05d1c7c0 | 2512 | |
4949314c | 2513 | void transport_kunmap_data_sg(struct se_cmd *cmd) |
05d1c7c0 | 2514 | { |
a1edf9cf | 2515 | if (!cmd->t_data_nents) { |
4949314c | 2516 | return; |
a1edf9cf | 2517 | } else if (cmd->t_data_nents == 1) { |
4949314c | 2518 | kunmap(sg_page(cmd->t_data_sg)); |
a1edf9cf AG |
2519 | return; |
2520 | } | |
4949314c AG |
2521 | |
2522 | vunmap(cmd->t_data_vmap); | |
2523 | cmd->t_data_vmap = NULL; | |
05d1c7c0 | 2524 | } |
4949314c | 2525 | EXPORT_SYMBOL(transport_kunmap_data_sg); |
05d1c7c0 | 2526 | |
c66ac9db | 2527 | static int |
05d1c7c0 | 2528 | transport_generic_get_mem(struct se_cmd *cmd) |
c66ac9db | 2529 | { |
ec98f782 AG |
2530 | u32 length = cmd->data_length; |
2531 | unsigned int nents; | |
2532 | struct page *page; | |
9db9da33 | 2533 | gfp_t zero_flag; |
ec98f782 | 2534 | int i = 0; |
c66ac9db | 2535 | |
ec98f782 AG |
2536 | nents = DIV_ROUND_UP(length, PAGE_SIZE); |
2537 | cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL); | |
2538 | if (!cmd->t_data_sg) | |
2539 | return -ENOMEM; | |
c66ac9db | 2540 | |
ec98f782 AG |
2541 | cmd->t_data_nents = nents; |
2542 | sg_init_table(cmd->t_data_sg, nents); | |
c66ac9db | 2543 | |
64f1db38 | 2544 | zero_flag = cmd->se_cmd_flags & SCF_SCSI_DATA_CDB ? 0 : __GFP_ZERO; |
9db9da33 | 2545 | |
ec98f782 AG |
2546 | while (length) { |
2547 | u32 page_len = min_t(u32, length, PAGE_SIZE); | |
9db9da33 | 2548 | page = alloc_page(GFP_KERNEL | zero_flag); |
ec98f782 AG |
2549 | if (!page) |
2550 | goto out; | |
c66ac9db | 2551 | |
ec98f782 AG |
2552 | sg_set_page(&cmd->t_data_sg[i], page, page_len, 0); |
2553 | length -= page_len; | |
2554 | i++; | |
c66ac9db | 2555 | } |
c66ac9db | 2556 | return 0; |
c66ac9db | 2557 | |
ec98f782 AG |
2558 | out: |
2559 | while (i >= 0) { | |
2560 | __free_page(sg_page(&cmd->t_data_sg[i])); | |
2561 | i--; | |
c66ac9db | 2562 | } |
ec98f782 AG |
2563 | kfree(cmd->t_data_sg); |
2564 | cmd->t_data_sg = NULL; | |
2565 | return -ENOMEM; | |
c66ac9db NB |
2566 | } |
2567 | ||
da0f7619 | 2568 | /* |
b16a35b0 AG |
2569 | * Allocate any required resources to execute the command. For writes we |
2570 | * might not have the payload yet, so notify the fabric via a call to | |
2571 | * ->write_pending instead. Otherwise place it on the execution queue. | |
c66ac9db | 2572 | */ |
a1d8b49a | 2573 | int transport_generic_new_cmd(struct se_cmd *cmd) |
c66ac9db | 2574 | { |
c66ac9db NB |
2575 | int ret = 0; |
2576 | ||
2577 | /* | |
2578 | * Determine is the TCM fabric module has already allocated physical | |
2579 | * memory, and is directly calling transport_generic_map_mem_to_cmd() | |
ec98f782 | 2580 | * beforehand. |
c66ac9db | 2581 | */ |
ec98f782 AG |
2582 | if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) && |
2583 | cmd->data_length) { | |
05d1c7c0 | 2584 | ret = transport_generic_get_mem(cmd); |
c66ac9db | 2585 | if (ret < 0) |
03e98c9e | 2586 | goto out_fail; |
c66ac9db | 2587 | } |
da0f7619 | 2588 | |
4101f0a8 | 2589 | /* Workaround for handling zero-length control CDBs */ |
64f1db38 | 2590 | if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) && !cmd->data_length) { |
7d680f3b | 2591 | spin_lock_irq(&cmd->t_state_lock); |
410f6702 | 2592 | cmd->t_state = TRANSPORT_COMPLETE; |
7d680f3b CH |
2593 | cmd->transport_state |= CMD_T_ACTIVE; |
2594 | spin_unlock_irq(&cmd->t_state_lock); | |
91ec1d35 NB |
2595 | |
2596 | if (cmd->t_task_cdb[0] == REQUEST_SENSE) { | |
2597 | u8 ua_asc = 0, ua_ascq = 0; | |
2598 | ||
2599 | core_scsi3_ua_clear_for_request_sense(cmd, | |
2600 | &ua_asc, &ua_ascq); | |
2601 | } | |
2602 | ||
410f6702 RD |
2603 | INIT_WORK(&cmd->work, target_complete_ok_work); |
2604 | queue_work(target_completion_wq, &cmd->work); | |
2605 | return 0; | |
2606 | } | |
da0f7619 | 2607 | |
4101f0a8 | 2608 | atomic_inc(&cmd->t_fe_count); |
4101f0a8 | 2609 | |
c66ac9db | 2610 | /* |
5787cacd CH |
2611 | * For WRITEs, let the fabric know its buffer is ready. |
2612 | * | |
2613 | * The command will be added to the execution queue after its write | |
2614 | * data has arrived. | |
c66ac9db NB |
2615 | */ |
2616 | if (cmd->data_direction == DMA_TO_DEVICE) { | |
cf572a96 | 2617 | target_add_to_state_list(cmd); |
c66ac9db NB |
2618 | return transport_generic_write_pending(cmd); |
2619 | } | |
2620 | /* | |
5787cacd | 2621 | * Everything else but a WRITE, add the command to the execution queue. |
c66ac9db NB |
2622 | */ |
2623 | transport_execute_tasks(cmd); | |
2624 | return 0; | |
da0f7619 CH |
2625 | |
2626 | out_fail: | |
2627 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
2628 | cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
2629 | return -EINVAL; | |
c66ac9db | 2630 | } |
a1d8b49a | 2631 | EXPORT_SYMBOL(transport_generic_new_cmd); |
c66ac9db NB |
2632 | |
2633 | /* transport_generic_process_write(): | |
2634 | * | |
2635 | * | |
2636 | */ | |
2637 | void transport_generic_process_write(struct se_cmd *cmd) | |
2638 | { | |
c66ac9db NB |
2639 | transport_execute_tasks(cmd); |
2640 | } | |
2641 | EXPORT_SYMBOL(transport_generic_process_write); | |
2642 | ||
e057f533 | 2643 | static void transport_write_pending_qf(struct se_cmd *cmd) |
07bde79a | 2644 | { |
f147abb4 NB |
2645 | int ret; |
2646 | ||
2647 | ret = cmd->se_tfo->write_pending(cmd); | |
2648 | if (ret == -EAGAIN || ret == -ENOMEM) { | |
e057f533 CH |
2649 | pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", |
2650 | cmd); | |
2651 | transport_handle_queue_full(cmd, cmd->se_dev); | |
2652 | } | |
07bde79a NB |
2653 | } |
2654 | ||
c66ac9db NB |
2655 | static int transport_generic_write_pending(struct se_cmd *cmd) |
2656 | { | |
2657 | unsigned long flags; | |
2658 | int ret; | |
2659 | ||
a1d8b49a | 2660 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 2661 | cmd->t_state = TRANSPORT_WRITE_PENDING; |
a1d8b49a | 2662 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
07bde79a | 2663 | |
c66ac9db NB |
2664 | /* |
2665 | * Clear the se_cmd for WRITE_PENDING status in order to set | |
7d680f3b CH |
2666 | * CMD_T_ACTIVE so that transport_generic_handle_data can be called |
2667 | * from HW target mode interrupt code. This is safe to be called | |
2668 | * with transport_off=1 before the cmd->se_tfo->write_pending | |
c66ac9db NB |
2669 | * because the se_cmd->se_lun pointer is not being cleared. |
2670 | */ | |
2671 | transport_cmd_check_stop(cmd, 1, 0); | |
2672 | ||
2673 | /* | |
2674 | * Call the fabric write_pending function here to let the | |
2675 | * frontend know that WRITE buffers are ready. | |
2676 | */ | |
e3d6f909 | 2677 | ret = cmd->se_tfo->write_pending(cmd); |
f147abb4 | 2678 | if (ret == -EAGAIN || ret == -ENOMEM) |
07bde79a NB |
2679 | goto queue_full; |
2680 | else if (ret < 0) | |
c66ac9db NB |
2681 | return ret; |
2682 | ||
03e98c9e | 2683 | return 1; |
07bde79a NB |
2684 | |
2685 | queue_full: | |
6708bb27 | 2686 | pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd); |
07bde79a | 2687 | cmd->t_state = TRANSPORT_COMPLETE_QF_WP; |
e057f533 | 2688 | transport_handle_queue_full(cmd, cmd->se_dev); |
f147abb4 | 2689 | return 0; |
c66ac9db NB |
2690 | } |
2691 | ||
39c05f32 | 2692 | void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks) |
c66ac9db | 2693 | { |
d14921d6 | 2694 | if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) { |
c8e31f26 | 2695 | if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) |
d14921d6 NB |
2696 | transport_wait_for_tasks(cmd); |
2697 | ||
35462975 | 2698 | transport_release_cmd(cmd); |
d14921d6 NB |
2699 | } else { |
2700 | if (wait_for_tasks) | |
2701 | transport_wait_for_tasks(cmd); | |
2702 | ||
c66ac9db NB |
2703 | core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd); |
2704 | ||
82f1c8a4 | 2705 | if (cmd->se_lun) |
c66ac9db | 2706 | transport_lun_remove_cmd(cmd); |
c66ac9db | 2707 | |
39c05f32 | 2708 | transport_put_cmd(cmd); |
c66ac9db NB |
2709 | } |
2710 | } | |
2711 | EXPORT_SYMBOL(transport_generic_free_cmd); | |
2712 | ||
a17f091d NB |
2713 | /* target_get_sess_cmd - Add command to active ->sess_cmd_list |
2714 | * @se_sess: session to reference | |
2715 | * @se_cmd: command descriptor to add | |
a6360785 | 2716 | * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd() |
a17f091d | 2717 | */ |
a6360785 NB |
2718 | void target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd, |
2719 | bool ack_kref) | |
a17f091d NB |
2720 | { |
2721 | unsigned long flags; | |
2722 | ||
7481deb4 | 2723 | kref_init(&se_cmd->cmd_kref); |
a6360785 NB |
2724 | /* |
2725 | * Add a second kref if the fabric caller is expecting to handle | |
2726 | * fabric acknowledgement that requires two target_put_sess_cmd() | |
2727 | * invocations before se_cmd descriptor release. | |
2728 | */ | |
86715569 | 2729 | if (ack_kref == true) { |
a6360785 | 2730 | kref_get(&se_cmd->cmd_kref); |
86715569 NB |
2731 | se_cmd->se_cmd_flags |= SCF_ACK_KREF; |
2732 | } | |
7481deb4 | 2733 | |
a17f091d NB |
2734 | spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); |
2735 | list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list); | |
2736 | se_cmd->check_release = 1; | |
2737 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); | |
2738 | } | |
2739 | EXPORT_SYMBOL(target_get_sess_cmd); | |
2740 | ||
7481deb4 | 2741 | static void target_release_cmd_kref(struct kref *kref) |
a17f091d | 2742 | { |
7481deb4 NB |
2743 | struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref); |
2744 | struct se_session *se_sess = se_cmd->se_sess; | |
a17f091d NB |
2745 | unsigned long flags; |
2746 | ||
2747 | spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); | |
2748 | if (list_empty(&se_cmd->se_cmd_list)) { | |
2749 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); | |
ffc32d52 | 2750 | se_cmd->se_tfo->release_cmd(se_cmd); |
7481deb4 | 2751 | return; |
a17f091d | 2752 | } |
a17f091d NB |
2753 | if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) { |
2754 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); | |
2755 | complete(&se_cmd->cmd_wait_comp); | |
7481deb4 | 2756 | return; |
a17f091d NB |
2757 | } |
2758 | list_del(&se_cmd->se_cmd_list); | |
2759 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); | |
2760 | ||
7481deb4 NB |
2761 | se_cmd->se_tfo->release_cmd(se_cmd); |
2762 | } | |
2763 | ||
2764 | /* target_put_sess_cmd - Check for active I/O shutdown via kref_put | |
2765 | * @se_sess: session to reference | |
2766 | * @se_cmd: command descriptor to drop | |
2767 | */ | |
2768 | int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd) | |
2769 | { | |
2770 | return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref); | |
a17f091d NB |
2771 | } |
2772 | EXPORT_SYMBOL(target_put_sess_cmd); | |
2773 | ||
2774 | /* target_splice_sess_cmd_list - Split active cmds into sess_wait_list | |
2775 | * @se_sess: session to split | |
2776 | */ | |
2777 | void target_splice_sess_cmd_list(struct se_session *se_sess) | |
2778 | { | |
2779 | struct se_cmd *se_cmd; | |
2780 | unsigned long flags; | |
2781 | ||
2782 | WARN_ON(!list_empty(&se_sess->sess_wait_list)); | |
2783 | INIT_LIST_HEAD(&se_sess->sess_wait_list); | |
2784 | ||
2785 | spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); | |
2786 | se_sess->sess_tearing_down = 1; | |
2787 | ||
2788 | list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list); | |
2789 | ||
2790 | list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list) | |
2791 | se_cmd->cmd_wait_set = 1; | |
2792 | ||
2793 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); | |
2794 | } | |
2795 | EXPORT_SYMBOL(target_splice_sess_cmd_list); | |
2796 | ||
2797 | /* target_wait_for_sess_cmds - Wait for outstanding descriptors | |
2798 | * @se_sess: session to wait for active I/O | |
2799 | * @wait_for_tasks: Make extra transport_wait_for_tasks call | |
2800 | */ | |
2801 | void target_wait_for_sess_cmds( | |
2802 | struct se_session *se_sess, | |
2803 | int wait_for_tasks) | |
2804 | { | |
2805 | struct se_cmd *se_cmd, *tmp_cmd; | |
2806 | bool rc = false; | |
2807 | ||
2808 | list_for_each_entry_safe(se_cmd, tmp_cmd, | |
2809 | &se_sess->sess_wait_list, se_cmd_list) { | |
2810 | list_del(&se_cmd->se_cmd_list); | |
2811 | ||
2812 | pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:" | |
2813 | " %d\n", se_cmd, se_cmd->t_state, | |
2814 | se_cmd->se_tfo->get_cmd_state(se_cmd)); | |
2815 | ||
2816 | if (wait_for_tasks) { | |
2817 | pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d," | |
2818 | " fabric state: %d\n", se_cmd, se_cmd->t_state, | |
2819 | se_cmd->se_tfo->get_cmd_state(se_cmd)); | |
2820 | ||
2821 | rc = transport_wait_for_tasks(se_cmd); | |
2822 | ||
2823 | pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d," | |
2824 | " fabric state: %d\n", se_cmd, se_cmd->t_state, | |
2825 | se_cmd->se_tfo->get_cmd_state(se_cmd)); | |
2826 | } | |
2827 | ||
2828 | if (!rc) { | |
2829 | wait_for_completion(&se_cmd->cmd_wait_comp); | |
2830 | pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d" | |
2831 | " fabric state: %d\n", se_cmd, se_cmd->t_state, | |
2832 | se_cmd->se_tfo->get_cmd_state(se_cmd)); | |
2833 | } | |
2834 | ||
2835 | se_cmd->se_tfo->release_cmd(se_cmd); | |
2836 | } | |
2837 | } | |
2838 | EXPORT_SYMBOL(target_wait_for_sess_cmds); | |
2839 | ||
c66ac9db NB |
2840 | /* transport_lun_wait_for_tasks(): |
2841 | * | |
2842 | * Called from ConfigFS context to stop the passed struct se_cmd to allow | |
2843 | * an struct se_lun to be successfully shutdown. | |
2844 | */ | |
2845 | static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun) | |
2846 | { | |
2847 | unsigned long flags; | |
cf572a96 CH |
2848 | int ret = 0; |
2849 | ||
c66ac9db NB |
2850 | /* |
2851 | * If the frontend has already requested this struct se_cmd to | |
2852 | * be stopped, we can safely ignore this struct se_cmd. | |
2853 | */ | |
a1d8b49a | 2854 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
7d680f3b CH |
2855 | if (cmd->transport_state & CMD_T_STOP) { |
2856 | cmd->transport_state &= ~CMD_T_LUN_STOP; | |
2857 | ||
2858 | pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n", | |
2859 | cmd->se_tfo->get_task_tag(cmd)); | |
a1d8b49a | 2860 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 2861 | transport_cmd_check_stop(cmd, 1, 0); |
e3d6f909 | 2862 | return -EPERM; |
c66ac9db | 2863 | } |
7d680f3b | 2864 | cmd->transport_state |= CMD_T_LUN_FE_STOP; |
a1d8b49a | 2865 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 2866 | |
5951146d | 2867 | wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq); |
c66ac9db | 2868 | |
cf572a96 CH |
2869 | // XXX: audit task_flags checks. |
2870 | spin_lock_irqsave(&cmd->t_state_lock, flags); | |
2871 | if ((cmd->transport_state & CMD_T_BUSY) && | |
2872 | (cmd->transport_state & CMD_T_SENT)) { | |
2873 | if (!target_stop_cmd(cmd, &flags)) | |
2874 | ret++; | |
23019170 | 2875 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
cf572a96 CH |
2876 | } else { |
2877 | spin_unlock_irqrestore(&cmd->t_state_lock, | |
2878 | flags); | |
2879 | target_remove_from_execute_list(cmd); | |
2880 | } | |
c66ac9db | 2881 | |
785fdf70 CH |
2882 | pr_debug("ConfigFS: cmd: %p stop tasks ret:" |
2883 | " %d\n", cmd, ret); | |
c66ac9db | 2884 | if (!ret) { |
6708bb27 | 2885 | pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n", |
e3d6f909 | 2886 | cmd->se_tfo->get_task_tag(cmd)); |
a1d8b49a | 2887 | wait_for_completion(&cmd->transport_lun_stop_comp); |
6708bb27 | 2888 | pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n", |
e3d6f909 | 2889 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 2890 | } |
3df8d40b | 2891 | transport_remove_cmd_from_queue(cmd); |
c66ac9db NB |
2892 | |
2893 | return 0; | |
2894 | } | |
2895 | ||
c66ac9db NB |
2896 | static void __transport_clear_lun_from_sessions(struct se_lun *lun) |
2897 | { | |
2898 | struct se_cmd *cmd = NULL; | |
2899 | unsigned long lun_flags, cmd_flags; | |
2900 | /* | |
2901 | * Do exception processing and return CHECK_CONDITION status to the | |
2902 | * Initiator Port. | |
2903 | */ | |
2904 | spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags); | |
5951146d AG |
2905 | while (!list_empty(&lun->lun_cmd_list)) { |
2906 | cmd = list_first_entry(&lun->lun_cmd_list, | |
2907 | struct se_cmd, se_lun_node); | |
3d26fea0 | 2908 | list_del_init(&cmd->se_lun_node); |
5951146d | 2909 | |
c66ac9db NB |
2910 | /* |
2911 | * This will notify iscsi_target_transport.c: | |
2912 | * transport_cmd_check_stop() that a LUN shutdown is in | |
2913 | * progress for the iscsi_cmd_t. | |
2914 | */ | |
a1d8b49a | 2915 | spin_lock(&cmd->t_state_lock); |
6708bb27 | 2916 | pr_debug("SE_LUN[%d] - Setting cmd->transport" |
c66ac9db | 2917 | "_lun_stop for ITT: 0x%08x\n", |
e3d6f909 AG |
2918 | cmd->se_lun->unpacked_lun, |
2919 | cmd->se_tfo->get_task_tag(cmd)); | |
7d680f3b | 2920 | cmd->transport_state |= CMD_T_LUN_STOP; |
a1d8b49a | 2921 | spin_unlock(&cmd->t_state_lock); |
c66ac9db NB |
2922 | |
2923 | spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags); | |
2924 | ||
6708bb27 AG |
2925 | if (!cmd->se_lun) { |
2926 | pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n", | |
e3d6f909 AG |
2927 | cmd->se_tfo->get_task_tag(cmd), |
2928 | cmd->se_tfo->get_cmd_state(cmd), cmd->t_state); | |
c66ac9db NB |
2929 | BUG(); |
2930 | } | |
2931 | /* | |
2932 | * If the Storage engine still owns the iscsi_cmd_t, determine | |
2933 | * and/or stop its context. | |
2934 | */ | |
6708bb27 | 2935 | pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport" |
e3d6f909 AG |
2936 | "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun, |
2937 | cmd->se_tfo->get_task_tag(cmd)); | |
c66ac9db | 2938 | |
e3d6f909 | 2939 | if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) { |
c66ac9db NB |
2940 | spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags); |
2941 | continue; | |
2942 | } | |
2943 | ||
6708bb27 | 2944 | pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun" |
c66ac9db | 2945 | "_wait_for_tasks(): SUCCESS\n", |
e3d6f909 AG |
2946 | cmd->se_lun->unpacked_lun, |
2947 | cmd->se_tfo->get_task_tag(cmd)); | |
c66ac9db | 2948 | |
a1d8b49a | 2949 | spin_lock_irqsave(&cmd->t_state_lock, cmd_flags); |
7d680f3b | 2950 | if (!(cmd->transport_state & CMD_T_DEV_ACTIVE)) { |
a1d8b49a | 2951 | spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags); |
c66ac9db NB |
2952 | goto check_cond; |
2953 | } | |
7d680f3b | 2954 | cmd->transport_state &= ~CMD_T_DEV_ACTIVE; |
cf572a96 | 2955 | target_remove_from_state_list(cmd); |
a1d8b49a | 2956 | spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags); |
c66ac9db | 2957 | |
c66ac9db NB |
2958 | /* |
2959 | * The Storage engine stopped this struct se_cmd before it was | |
2960 | * send to the fabric frontend for delivery back to the | |
2961 | * Initiator Node. Return this SCSI CDB back with an | |
2962 | * CHECK_CONDITION status. | |
2963 | */ | |
2964 | check_cond: | |
2965 | transport_send_check_condition_and_sense(cmd, | |
2966 | TCM_NON_EXISTENT_LUN, 0); | |
2967 | /* | |
2968 | * If the fabric frontend is waiting for this iscsi_cmd_t to | |
2969 | * be released, notify the waiting thread now that LU has | |
2970 | * finished accessing it. | |
2971 | */ | |
a1d8b49a | 2972 | spin_lock_irqsave(&cmd->t_state_lock, cmd_flags); |
7d680f3b | 2973 | if (cmd->transport_state & CMD_T_LUN_FE_STOP) { |
6708bb27 | 2974 | pr_debug("SE_LUN[%d] - Detected FE stop for" |
c66ac9db NB |
2975 | " struct se_cmd: %p ITT: 0x%08x\n", |
2976 | lun->unpacked_lun, | |
e3d6f909 | 2977 | cmd, cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 2978 | |
a1d8b49a | 2979 | spin_unlock_irqrestore(&cmd->t_state_lock, |
c66ac9db NB |
2980 | cmd_flags); |
2981 | transport_cmd_check_stop(cmd, 1, 0); | |
a1d8b49a | 2982 | complete(&cmd->transport_lun_fe_stop_comp); |
c66ac9db NB |
2983 | spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags); |
2984 | continue; | |
2985 | } | |
6708bb27 | 2986 | pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n", |
e3d6f909 | 2987 | lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 2988 | |
a1d8b49a | 2989 | spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags); |
c66ac9db NB |
2990 | spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags); |
2991 | } | |
2992 | spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags); | |
2993 | } | |
2994 | ||
2995 | static int transport_clear_lun_thread(void *p) | |
2996 | { | |
8359cf43 | 2997 | struct se_lun *lun = p; |
c66ac9db NB |
2998 | |
2999 | __transport_clear_lun_from_sessions(lun); | |
3000 | complete(&lun->lun_shutdown_comp); | |
3001 | ||
3002 | return 0; | |
3003 | } | |
3004 | ||
3005 | int transport_clear_lun_from_sessions(struct se_lun *lun) | |
3006 | { | |
3007 | struct task_struct *kt; | |
3008 | ||
5951146d | 3009 | kt = kthread_run(transport_clear_lun_thread, lun, |
c66ac9db NB |
3010 | "tcm_cl_%u", lun->unpacked_lun); |
3011 | if (IS_ERR(kt)) { | |
6708bb27 | 3012 | pr_err("Unable to start clear_lun thread\n"); |
e3d6f909 | 3013 | return PTR_ERR(kt); |
c66ac9db NB |
3014 | } |
3015 | wait_for_completion(&lun->lun_shutdown_comp); | |
3016 | ||
3017 | return 0; | |
3018 | } | |
3019 | ||
d14921d6 NB |
3020 | /** |
3021 | * transport_wait_for_tasks - wait for completion to occur | |
3022 | * @cmd: command to wait | |
c66ac9db | 3023 | * |
d14921d6 NB |
3024 | * Called from frontend fabric context to wait for storage engine |
3025 | * to pause and/or release frontend generated struct se_cmd. | |
c66ac9db | 3026 | */ |
a17f091d | 3027 | bool transport_wait_for_tasks(struct se_cmd *cmd) |
c66ac9db NB |
3028 | { |
3029 | unsigned long flags; | |
3030 | ||
a1d8b49a | 3031 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c8e31f26 AG |
3032 | if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && |
3033 | !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) { | |
d14921d6 | 3034 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
a17f091d | 3035 | return false; |
d14921d6 | 3036 | } |
cb4f4d3c | 3037 | |
c8e31f26 AG |
3038 | if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) && |
3039 | !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) { | |
d14921d6 | 3040 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
a17f091d | 3041 | return false; |
d14921d6 | 3042 | } |
c66ac9db NB |
3043 | /* |
3044 | * If we are already stopped due to an external event (ie: LUN shutdown) | |
3045 | * sleep until the connection can have the passed struct se_cmd back. | |
a1d8b49a | 3046 | * The cmd->transport_lun_stopped_sem will be upped by |
c66ac9db NB |
3047 | * transport_clear_lun_from_sessions() once the ConfigFS context caller |
3048 | * has completed its operation on the struct se_cmd. | |
3049 | */ | |
7d680f3b | 3050 | if (cmd->transport_state & CMD_T_LUN_STOP) { |
6708bb27 | 3051 | pr_debug("wait_for_tasks: Stopping" |
e3d6f909 | 3052 | " wait_for_completion(&cmd->t_tasktransport_lun_fe" |
c66ac9db | 3053 | "_stop_comp); for ITT: 0x%08x\n", |
e3d6f909 | 3054 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db NB |
3055 | /* |
3056 | * There is a special case for WRITES where a FE exception + | |
3057 | * LUN shutdown means ConfigFS context is still sleeping on | |
3058 | * transport_lun_stop_comp in transport_lun_wait_for_tasks(). | |
3059 | * We go ahead and up transport_lun_stop_comp just to be sure | |
3060 | * here. | |
3061 | */ | |
a1d8b49a AG |
3062 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
3063 | complete(&cmd->transport_lun_stop_comp); | |
3064 | wait_for_completion(&cmd->transport_lun_fe_stop_comp); | |
3065 | spin_lock_irqsave(&cmd->t_state_lock, flags); | |
c66ac9db | 3066 | |
cf572a96 | 3067 | target_remove_from_state_list(cmd); |
c66ac9db NB |
3068 | /* |
3069 | * At this point, the frontend who was the originator of this | |
3070 | * struct se_cmd, now owns the structure and can be released through | |
3071 | * normal means below. | |
3072 | */ | |
6708bb27 | 3073 | pr_debug("wait_for_tasks: Stopped" |
e3d6f909 | 3074 | " wait_for_completion(&cmd->t_tasktransport_lun_fe_" |
c66ac9db | 3075 | "stop_comp); for ITT: 0x%08x\n", |
e3d6f909 | 3076 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 3077 | |
7d680f3b | 3078 | cmd->transport_state &= ~CMD_T_LUN_STOP; |
c66ac9db | 3079 | } |
7d680f3b | 3080 | |
3d28934a | 3081 | if (!(cmd->transport_state & CMD_T_ACTIVE)) { |
d14921d6 | 3082 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
a17f091d | 3083 | return false; |
d14921d6 | 3084 | } |
c66ac9db | 3085 | |
7d680f3b | 3086 | cmd->transport_state |= CMD_T_STOP; |
c66ac9db | 3087 | |
6708bb27 | 3088 | pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x" |
7d680f3b | 3089 | " i_state: %d, t_state: %d, CMD_T_STOP\n", |
f2da9dbd CH |
3090 | cmd, cmd->se_tfo->get_task_tag(cmd), |
3091 | cmd->se_tfo->get_cmd_state(cmd), cmd->t_state); | |
c66ac9db | 3092 | |
a1d8b49a | 3093 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 3094 | |
5951146d | 3095 | wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq); |
c66ac9db | 3096 | |
a1d8b49a | 3097 | wait_for_completion(&cmd->t_transport_stop_comp); |
c66ac9db | 3098 | |
a1d8b49a | 3099 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
7d680f3b | 3100 | cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP); |
c66ac9db | 3101 | |
6708bb27 | 3102 | pr_debug("wait_for_tasks: Stopped wait_for_compltion(" |
a1d8b49a | 3103 | "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n", |
e3d6f909 | 3104 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 3105 | |
d14921d6 | 3106 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
a17f091d NB |
3107 | |
3108 | return true; | |
c66ac9db | 3109 | } |
d14921d6 | 3110 | EXPORT_SYMBOL(transport_wait_for_tasks); |
c66ac9db NB |
3111 | |
3112 | static int transport_get_sense_codes( | |
3113 | struct se_cmd *cmd, | |
3114 | u8 *asc, | |
3115 | u8 *ascq) | |
3116 | { | |
3117 | *asc = cmd->scsi_asc; | |
3118 | *ascq = cmd->scsi_ascq; | |
3119 | ||
3120 | return 0; | |
3121 | } | |
3122 | ||
3123 | static int transport_set_sense_codes( | |
3124 | struct se_cmd *cmd, | |
3125 | u8 asc, | |
3126 | u8 ascq) | |
3127 | { | |
3128 | cmd->scsi_asc = asc; | |
3129 | cmd->scsi_ascq = ascq; | |
3130 | ||
3131 | return 0; | |
3132 | } | |
3133 | ||
3134 | int transport_send_check_condition_and_sense( | |
3135 | struct se_cmd *cmd, | |
3136 | u8 reason, | |
3137 | int from_transport) | |
3138 | { | |
3139 | unsigned char *buffer = cmd->sense_buffer; | |
3140 | unsigned long flags; | |
3141 | int offset; | |
3142 | u8 asc = 0, ascq = 0; | |
3143 | ||
a1d8b49a | 3144 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 3145 | if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) { |
a1d8b49a | 3146 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
3147 | return 0; |
3148 | } | |
3149 | cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION; | |
a1d8b49a | 3150 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
3151 | |
3152 | if (!reason && from_transport) | |
3153 | goto after_reason; | |
3154 | ||
3155 | if (!from_transport) | |
3156 | cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE; | |
3157 | /* | |
3158 | * Data Segment and SenseLength of the fabric response PDU. | |
3159 | * | |
3160 | * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE | |
3161 | * from include/scsi/scsi_cmnd.h | |
3162 | */ | |
e3d6f909 | 3163 | offset = cmd->se_tfo->set_fabric_sense_len(cmd, |
c66ac9db NB |
3164 | TRANSPORT_SENSE_BUFFER); |
3165 | /* | |
3166 | * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses | |
3167 | * SENSE KEY values from include/scsi/scsi.h | |
3168 | */ | |
3169 | switch (reason) { | |
3170 | case TCM_NON_EXISTENT_LUN: | |
eb39d340 NB |
3171 | /* CURRENT ERROR */ |
3172 | buffer[offset] = 0x70; | |
895f3022 | 3173 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
eb39d340 NB |
3174 | /* ILLEGAL REQUEST */ |
3175 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; | |
3176 | /* LOGICAL UNIT NOT SUPPORTED */ | |
3177 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25; | |
3178 | break; | |
c66ac9db NB |
3179 | case TCM_UNSUPPORTED_SCSI_OPCODE: |
3180 | case TCM_SECTOR_COUNT_TOO_MANY: | |
3181 | /* CURRENT ERROR */ | |
3182 | buffer[offset] = 0x70; | |
895f3022 | 3183 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
3184 | /* ILLEGAL REQUEST */ |
3185 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; | |
3186 | /* INVALID COMMAND OPERATION CODE */ | |
3187 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20; | |
3188 | break; | |
3189 | case TCM_UNKNOWN_MODE_PAGE: | |
3190 | /* CURRENT ERROR */ | |
3191 | buffer[offset] = 0x70; | |
895f3022 | 3192 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
3193 | /* ILLEGAL REQUEST */ |
3194 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; | |
3195 | /* INVALID FIELD IN CDB */ | |
3196 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24; | |
3197 | break; | |
3198 | case TCM_CHECK_CONDITION_ABORT_CMD: | |
3199 | /* CURRENT ERROR */ | |
3200 | buffer[offset] = 0x70; | |
895f3022 | 3201 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
3202 | /* ABORTED COMMAND */ |
3203 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; | |
3204 | /* BUS DEVICE RESET FUNCTION OCCURRED */ | |
3205 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29; | |
3206 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03; | |
3207 | break; | |
3208 | case TCM_INCORRECT_AMOUNT_OF_DATA: | |
3209 | /* CURRENT ERROR */ | |
3210 | buffer[offset] = 0x70; | |
895f3022 | 3211 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
3212 | /* ABORTED COMMAND */ |
3213 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; | |
3214 | /* WRITE ERROR */ | |
3215 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c; | |
3216 | /* NOT ENOUGH UNSOLICITED DATA */ | |
3217 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d; | |
3218 | break; | |
3219 | case TCM_INVALID_CDB_FIELD: | |
3220 | /* CURRENT ERROR */ | |
3221 | buffer[offset] = 0x70; | |
895f3022 | 3222 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
9fbc8909 RD |
3223 | /* ILLEGAL REQUEST */ |
3224 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; | |
c66ac9db NB |
3225 | /* INVALID FIELD IN CDB */ |
3226 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24; | |
3227 | break; | |
3228 | case TCM_INVALID_PARAMETER_LIST: | |
3229 | /* CURRENT ERROR */ | |
3230 | buffer[offset] = 0x70; | |
895f3022 | 3231 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
9fbc8909 RD |
3232 | /* ILLEGAL REQUEST */ |
3233 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; | |
c66ac9db NB |
3234 | /* INVALID FIELD IN PARAMETER LIST */ |
3235 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26; | |
3236 | break; | |
3237 | case TCM_UNEXPECTED_UNSOLICITED_DATA: | |
3238 | /* CURRENT ERROR */ | |
3239 | buffer[offset] = 0x70; | |
895f3022 | 3240 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
3241 | /* ABORTED COMMAND */ |
3242 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; | |
3243 | /* WRITE ERROR */ | |
3244 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c; | |
3245 | /* UNEXPECTED_UNSOLICITED_DATA */ | |
3246 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c; | |
3247 | break; | |
3248 | case TCM_SERVICE_CRC_ERROR: | |
3249 | /* CURRENT ERROR */ | |
3250 | buffer[offset] = 0x70; | |
895f3022 | 3251 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
3252 | /* ABORTED COMMAND */ |
3253 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; | |
3254 | /* PROTOCOL SERVICE CRC ERROR */ | |
3255 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47; | |
3256 | /* N/A */ | |
3257 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05; | |
3258 | break; | |
3259 | case TCM_SNACK_REJECTED: | |
3260 | /* CURRENT ERROR */ | |
3261 | buffer[offset] = 0x70; | |
895f3022 | 3262 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
3263 | /* ABORTED COMMAND */ |
3264 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; | |
3265 | /* READ ERROR */ | |
3266 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11; | |
3267 | /* FAILED RETRANSMISSION REQUEST */ | |
3268 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13; | |
3269 | break; | |
3270 | case TCM_WRITE_PROTECTED: | |
3271 | /* CURRENT ERROR */ | |
3272 | buffer[offset] = 0x70; | |
895f3022 | 3273 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
3274 | /* DATA PROTECT */ |
3275 | buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT; | |
3276 | /* WRITE PROTECTED */ | |
3277 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27; | |
3278 | break; | |
3279 | case TCM_CHECK_CONDITION_UNIT_ATTENTION: | |
3280 | /* CURRENT ERROR */ | |
3281 | buffer[offset] = 0x70; | |
895f3022 | 3282 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
3283 | /* UNIT ATTENTION */ |
3284 | buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION; | |
3285 | core_scsi3_ua_for_check_condition(cmd, &asc, &ascq); | |
3286 | buffer[offset+SPC_ASC_KEY_OFFSET] = asc; | |
3287 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq; | |
3288 | break; | |
3289 | case TCM_CHECK_CONDITION_NOT_READY: | |
3290 | /* CURRENT ERROR */ | |
3291 | buffer[offset] = 0x70; | |
895f3022 | 3292 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
3293 | /* Not Ready */ |
3294 | buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY; | |
3295 | transport_get_sense_codes(cmd, &asc, &ascq); | |
3296 | buffer[offset+SPC_ASC_KEY_OFFSET] = asc; | |
3297 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq; | |
3298 | break; | |
3299 | case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE: | |
3300 | default: | |
3301 | /* CURRENT ERROR */ | |
3302 | buffer[offset] = 0x70; | |
895f3022 | 3303 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
3304 | /* ILLEGAL REQUEST */ |
3305 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; | |
3306 | /* LOGICAL UNIT COMMUNICATION FAILURE */ | |
3307 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80; | |
3308 | break; | |
3309 | } | |
3310 | /* | |
3311 | * This code uses linux/include/scsi/scsi.h SAM status codes! | |
3312 | */ | |
3313 | cmd->scsi_status = SAM_STAT_CHECK_CONDITION; | |
3314 | /* | |
3315 | * Automatically padded, this value is encoded in the fabric's | |
3316 | * data_length response PDU containing the SCSI defined sense data. | |
3317 | */ | |
3318 | cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset; | |
3319 | ||
3320 | after_reason: | |
07bde79a | 3321 | return cmd->se_tfo->queue_status(cmd); |
c66ac9db NB |
3322 | } |
3323 | EXPORT_SYMBOL(transport_send_check_condition_and_sense); | |
3324 | ||
3325 | int transport_check_aborted_status(struct se_cmd *cmd, int send_status) | |
3326 | { | |
3327 | int ret = 0; | |
3328 | ||
7d680f3b | 3329 | if (cmd->transport_state & CMD_T_ABORTED) { |
6708bb27 | 3330 | if (!send_status || |
c66ac9db NB |
3331 | (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS)) |
3332 | return 1; | |
8b1e1244 | 3333 | |
6708bb27 | 3334 | pr_debug("Sending delayed SAM_STAT_TASK_ABORTED" |
c66ac9db | 3335 | " status for CDB: 0x%02x ITT: 0x%08x\n", |
a1d8b49a | 3336 | cmd->t_task_cdb[0], |
e3d6f909 | 3337 | cmd->se_tfo->get_task_tag(cmd)); |
8b1e1244 | 3338 | |
c66ac9db | 3339 | cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS; |
e3d6f909 | 3340 | cmd->se_tfo->queue_status(cmd); |
c66ac9db NB |
3341 | ret = 1; |
3342 | } | |
3343 | return ret; | |
3344 | } | |
3345 | EXPORT_SYMBOL(transport_check_aborted_status); | |
3346 | ||
3347 | void transport_send_task_abort(struct se_cmd *cmd) | |
3348 | { | |
c252f003 NB |
3349 | unsigned long flags; |
3350 | ||
3351 | spin_lock_irqsave(&cmd->t_state_lock, flags); | |
3352 | if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) { | |
3353 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
3354 | return; | |
3355 | } | |
3356 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
3357 | ||
c66ac9db NB |
3358 | /* |
3359 | * If there are still expected incoming fabric WRITEs, we wait | |
3360 | * until until they have completed before sending a TASK_ABORTED | |
3361 | * response. This response with TASK_ABORTED status will be | |
3362 | * queued back to fabric module by transport_check_aborted_status(). | |
3363 | */ | |
3364 | if (cmd->data_direction == DMA_TO_DEVICE) { | |
e3d6f909 | 3365 | if (cmd->se_tfo->write_pending_status(cmd) != 0) { |
7d680f3b | 3366 | cmd->transport_state |= CMD_T_ABORTED; |
c66ac9db | 3367 | smp_mb__after_atomic_inc(); |
c66ac9db NB |
3368 | } |
3369 | } | |
3370 | cmd->scsi_status = SAM_STAT_TASK_ABORTED; | |
8b1e1244 | 3371 | |
6708bb27 | 3372 | pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x," |
a1d8b49a | 3373 | " ITT: 0x%08x\n", cmd->t_task_cdb[0], |
e3d6f909 | 3374 | cmd->se_tfo->get_task_tag(cmd)); |
8b1e1244 | 3375 | |
e3d6f909 | 3376 | cmd->se_tfo->queue_status(cmd); |
c66ac9db NB |
3377 | } |
3378 | ||
e26d99ae | 3379 | static int transport_generic_do_tmr(struct se_cmd *cmd) |
c66ac9db | 3380 | { |
5951146d | 3381 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
3382 | struct se_tmr_req *tmr = cmd->se_tmr_req; |
3383 | int ret; | |
3384 | ||
3385 | switch (tmr->function) { | |
5c6cd613 | 3386 | case TMR_ABORT_TASK: |
3d28934a | 3387 | core_tmr_abort_task(dev, tmr, cmd->se_sess); |
c66ac9db | 3388 | break; |
5c6cd613 NB |
3389 | case TMR_ABORT_TASK_SET: |
3390 | case TMR_CLEAR_ACA: | |
3391 | case TMR_CLEAR_TASK_SET: | |
c66ac9db NB |
3392 | tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED; |
3393 | break; | |
5c6cd613 | 3394 | case TMR_LUN_RESET: |
c66ac9db NB |
3395 | ret = core_tmr_lun_reset(dev, tmr, NULL, NULL); |
3396 | tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE : | |
3397 | TMR_FUNCTION_REJECTED; | |
3398 | break; | |
5c6cd613 | 3399 | case TMR_TARGET_WARM_RESET: |
c66ac9db NB |
3400 | tmr->response = TMR_FUNCTION_REJECTED; |
3401 | break; | |
5c6cd613 | 3402 | case TMR_TARGET_COLD_RESET: |
c66ac9db NB |
3403 | tmr->response = TMR_FUNCTION_REJECTED; |
3404 | break; | |
c66ac9db | 3405 | default: |
6708bb27 | 3406 | pr_err("Uknown TMR function: 0x%02x.\n", |
c66ac9db NB |
3407 | tmr->function); |
3408 | tmr->response = TMR_FUNCTION_REJECTED; | |
3409 | break; | |
3410 | } | |
3411 | ||
3412 | cmd->t_state = TRANSPORT_ISTATE_PROCESSING; | |
e3d6f909 | 3413 | cmd->se_tfo->queue_tm_rsp(cmd); |
c66ac9db | 3414 | |
b7b8bef7 | 3415 | transport_cmd_check_stop_to_fabric(cmd); |
c66ac9db NB |
3416 | return 0; |
3417 | } | |
3418 | ||
c66ac9db NB |
3419 | /* transport_processing_thread(): |
3420 | * | |
3421 | * | |
3422 | */ | |
3423 | static int transport_processing_thread(void *param) | |
3424 | { | |
5951146d | 3425 | int ret; |
c66ac9db | 3426 | struct se_cmd *cmd; |
8359cf43 | 3427 | struct se_device *dev = param; |
c66ac9db | 3428 | |
c66ac9db | 3429 | while (!kthread_should_stop()) { |
e3d6f909 AG |
3430 | ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq, |
3431 | atomic_read(&dev->dev_queue_obj.queue_cnt) || | |
c66ac9db NB |
3432 | kthread_should_stop()); |
3433 | if (ret < 0) | |
3434 | goto out; | |
3435 | ||
c66ac9db | 3436 | get_cmd: |
5951146d AG |
3437 | cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj); |
3438 | if (!cmd) | |
c66ac9db NB |
3439 | continue; |
3440 | ||
5951146d | 3441 | switch (cmd->t_state) { |
680b73c5 CH |
3442 | case TRANSPORT_NEW_CMD: |
3443 | BUG(); | |
3444 | break; | |
c66ac9db | 3445 | case TRANSPORT_NEW_CMD_MAP: |
6708bb27 AG |
3446 | if (!cmd->se_tfo->new_cmd_map) { |
3447 | pr_err("cmd->se_tfo->new_cmd_map is" | |
c66ac9db NB |
3448 | " NULL for TRANSPORT_NEW_CMD_MAP\n"); |
3449 | BUG(); | |
3450 | } | |
e3d6f909 | 3451 | ret = cmd->se_tfo->new_cmd_map(cmd); |
c66ac9db | 3452 | if (ret < 0) { |
03e98c9e | 3453 | transport_generic_request_failure(cmd); |
c66ac9db NB |
3454 | break; |
3455 | } | |
c66ac9db | 3456 | ret = transport_generic_new_cmd(cmd); |
f147abb4 | 3457 | if (ret < 0) { |
03e98c9e NB |
3458 | transport_generic_request_failure(cmd); |
3459 | break; | |
c66ac9db NB |
3460 | } |
3461 | break; | |
3462 | case TRANSPORT_PROCESS_WRITE: | |
3463 | transport_generic_process_write(cmd); | |
3464 | break; | |
c66ac9db NB |
3465 | case TRANSPORT_PROCESS_TMR: |
3466 | transport_generic_do_tmr(cmd); | |
3467 | break; | |
07bde79a | 3468 | case TRANSPORT_COMPLETE_QF_WP: |
e057f533 CH |
3469 | transport_write_pending_qf(cmd); |
3470 | break; | |
3471 | case TRANSPORT_COMPLETE_QF_OK: | |
3472 | transport_complete_qf(cmd); | |
07bde79a | 3473 | break; |
c66ac9db | 3474 | default: |
f2da9dbd CH |
3475 | pr_err("Unknown t_state: %d for ITT: 0x%08x " |
3476 | "i_state: %d on SE LUN: %u\n", | |
3477 | cmd->t_state, | |
e3d6f909 AG |
3478 | cmd->se_tfo->get_task_tag(cmd), |
3479 | cmd->se_tfo->get_cmd_state(cmd), | |
3480 | cmd->se_lun->unpacked_lun); | |
c66ac9db NB |
3481 | BUG(); |
3482 | } | |
3483 | ||
3484 | goto get_cmd; | |
3485 | } | |
3486 | ||
3487 | out: | |
cf572a96 | 3488 | WARN_ON(!list_empty(&dev->state_list)); |
ce8762f6 | 3489 | WARN_ON(!list_empty(&dev->dev_queue_obj.qobj_list)); |
c66ac9db NB |
3490 | dev->process_thread = NULL; |
3491 | return 0; | |
3492 | } |