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c66ac9db NB |
1 | /******************************************************************************* |
2 | * Filename: target_core_transport.c | |
3 | * | |
4 | * This file contains the Generic Target Engine Core. | |
5 | * | |
4c76251e | 6 | * (c) Copyright 2002-2013 Datera, Inc. |
c66ac9db NB |
7 | * |
8 | * Nicholas A. Bellinger <nab@kernel.org> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
23 | * | |
24 | ******************************************************************************/ | |
25 | ||
c66ac9db NB |
26 | #include <linux/net.h> |
27 | #include <linux/delay.h> | |
28 | #include <linux/string.h> | |
29 | #include <linux/timer.h> | |
30 | #include <linux/slab.h> | |
c66ac9db | 31 | #include <linux/spinlock.h> |
c66ac9db NB |
32 | #include <linux/kthread.h> |
33 | #include <linux/in.h> | |
34 | #include <linux/cdrom.h> | |
827509e3 | 35 | #include <linux/module.h> |
015487b8 | 36 | #include <linux/ratelimit.h> |
c66ac9db NB |
37 | #include <asm/unaligned.h> |
38 | #include <net/sock.h> | |
39 | #include <net/tcp.h> | |
40 | #include <scsi/scsi.h> | |
41 | #include <scsi/scsi_cmnd.h> | |
e66ecd50 | 42 | #include <scsi/scsi_tcq.h> |
c66ac9db NB |
43 | |
44 | #include <target/target_core_base.h> | |
c4795fb2 CH |
45 | #include <target/target_core_backend.h> |
46 | #include <target/target_core_fabric.h> | |
c66ac9db NB |
47 | #include <target/target_core_configfs.h> |
48 | ||
e26d99ae | 49 | #include "target_core_internal.h" |
c66ac9db | 50 | #include "target_core_alua.h" |
c66ac9db | 51 | #include "target_core_pr.h" |
c66ac9db NB |
52 | #include "target_core_ua.h" |
53 | ||
e5c0d6ad RD |
54 | #define CREATE_TRACE_POINTS |
55 | #include <trace/events/target.h> | |
56 | ||
35e0e757 | 57 | static struct workqueue_struct *target_completion_wq; |
c66ac9db | 58 | static struct kmem_cache *se_sess_cache; |
c66ac9db | 59 | struct kmem_cache *se_ua_cache; |
c66ac9db NB |
60 | struct kmem_cache *t10_pr_reg_cache; |
61 | struct kmem_cache *t10_alua_lu_gp_cache; | |
62 | struct kmem_cache *t10_alua_lu_gp_mem_cache; | |
63 | struct kmem_cache *t10_alua_tg_pt_gp_cache; | |
64 | struct kmem_cache *t10_alua_tg_pt_gp_mem_cache; | |
229d4f11 HR |
65 | struct kmem_cache *t10_alua_lba_map_cache; |
66 | struct kmem_cache *t10_alua_lba_map_mem_cache; | |
c66ac9db | 67 | |
c66ac9db | 68 | static void transport_complete_task_attr(struct se_cmd *cmd); |
07bde79a | 69 | static void transport_handle_queue_full(struct se_cmd *cmd, |
e057f533 | 70 | struct se_device *dev); |
d5ddad41 | 71 | static int transport_put_cmd(struct se_cmd *cmd); |
35e0e757 | 72 | static void target_complete_ok_work(struct work_struct *work); |
c66ac9db | 73 | |
e3d6f909 | 74 | int init_se_kmem_caches(void) |
c66ac9db | 75 | { |
c66ac9db NB |
76 | se_sess_cache = kmem_cache_create("se_sess_cache", |
77 | sizeof(struct se_session), __alignof__(struct se_session), | |
78 | 0, NULL); | |
6708bb27 AG |
79 | if (!se_sess_cache) { |
80 | pr_err("kmem_cache_create() for struct se_session" | |
c66ac9db | 81 | " failed\n"); |
c8e31f26 | 82 | goto out; |
c66ac9db NB |
83 | } |
84 | se_ua_cache = kmem_cache_create("se_ua_cache", | |
85 | sizeof(struct se_ua), __alignof__(struct se_ua), | |
86 | 0, NULL); | |
6708bb27 AG |
87 | if (!se_ua_cache) { |
88 | pr_err("kmem_cache_create() for struct se_ua failed\n"); | |
35e0e757 | 89 | goto out_free_sess_cache; |
c66ac9db | 90 | } |
c66ac9db NB |
91 | t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache", |
92 | sizeof(struct t10_pr_registration), | |
93 | __alignof__(struct t10_pr_registration), 0, NULL); | |
6708bb27 AG |
94 | if (!t10_pr_reg_cache) { |
95 | pr_err("kmem_cache_create() for struct t10_pr_registration" | |
c66ac9db | 96 | " failed\n"); |
35e0e757 | 97 | goto out_free_ua_cache; |
c66ac9db NB |
98 | } |
99 | t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache", | |
100 | sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp), | |
101 | 0, NULL); | |
6708bb27 AG |
102 | if (!t10_alua_lu_gp_cache) { |
103 | pr_err("kmem_cache_create() for t10_alua_lu_gp_cache" | |
c66ac9db | 104 | " failed\n"); |
35e0e757 | 105 | goto out_free_pr_reg_cache; |
c66ac9db NB |
106 | } |
107 | t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache", | |
108 | sizeof(struct t10_alua_lu_gp_member), | |
109 | __alignof__(struct t10_alua_lu_gp_member), 0, NULL); | |
6708bb27 AG |
110 | if (!t10_alua_lu_gp_mem_cache) { |
111 | pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_" | |
c66ac9db | 112 | "cache failed\n"); |
35e0e757 | 113 | goto out_free_lu_gp_cache; |
c66ac9db NB |
114 | } |
115 | t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache", | |
116 | sizeof(struct t10_alua_tg_pt_gp), | |
117 | __alignof__(struct t10_alua_tg_pt_gp), 0, NULL); | |
6708bb27 AG |
118 | if (!t10_alua_tg_pt_gp_cache) { |
119 | pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_" | |
c66ac9db | 120 | "cache failed\n"); |
35e0e757 | 121 | goto out_free_lu_gp_mem_cache; |
c66ac9db NB |
122 | } |
123 | t10_alua_tg_pt_gp_mem_cache = kmem_cache_create( | |
124 | "t10_alua_tg_pt_gp_mem_cache", | |
125 | sizeof(struct t10_alua_tg_pt_gp_member), | |
126 | __alignof__(struct t10_alua_tg_pt_gp_member), | |
127 | 0, NULL); | |
6708bb27 AG |
128 | if (!t10_alua_tg_pt_gp_mem_cache) { |
129 | pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_" | |
c66ac9db | 130 | "mem_t failed\n"); |
35e0e757 | 131 | goto out_free_tg_pt_gp_cache; |
c66ac9db | 132 | } |
229d4f11 HR |
133 | t10_alua_lba_map_cache = kmem_cache_create( |
134 | "t10_alua_lba_map_cache", | |
135 | sizeof(struct t10_alua_lba_map), | |
136 | __alignof__(struct t10_alua_lba_map), 0, NULL); | |
137 | if (!t10_alua_lba_map_cache) { | |
138 | pr_err("kmem_cache_create() for t10_alua_lba_map_" | |
139 | "cache failed\n"); | |
140 | goto out_free_tg_pt_gp_mem_cache; | |
141 | } | |
142 | t10_alua_lba_map_mem_cache = kmem_cache_create( | |
143 | "t10_alua_lba_map_mem_cache", | |
144 | sizeof(struct t10_alua_lba_map_member), | |
145 | __alignof__(struct t10_alua_lba_map_member), 0, NULL); | |
146 | if (!t10_alua_lba_map_mem_cache) { | |
147 | pr_err("kmem_cache_create() for t10_alua_lba_map_mem_" | |
148 | "cache failed\n"); | |
149 | goto out_free_lba_map_cache; | |
150 | } | |
c66ac9db | 151 | |
35e0e757 CH |
152 | target_completion_wq = alloc_workqueue("target_completion", |
153 | WQ_MEM_RECLAIM, 0); | |
154 | if (!target_completion_wq) | |
229d4f11 | 155 | goto out_free_lba_map_mem_cache; |
35e0e757 | 156 | |
c66ac9db | 157 | return 0; |
35e0e757 | 158 | |
229d4f11 HR |
159 | out_free_lba_map_mem_cache: |
160 | kmem_cache_destroy(t10_alua_lba_map_mem_cache); | |
161 | out_free_lba_map_cache: | |
162 | kmem_cache_destroy(t10_alua_lba_map_cache); | |
35e0e757 CH |
163 | out_free_tg_pt_gp_mem_cache: |
164 | kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache); | |
165 | out_free_tg_pt_gp_cache: | |
166 | kmem_cache_destroy(t10_alua_tg_pt_gp_cache); | |
167 | out_free_lu_gp_mem_cache: | |
168 | kmem_cache_destroy(t10_alua_lu_gp_mem_cache); | |
169 | out_free_lu_gp_cache: | |
170 | kmem_cache_destroy(t10_alua_lu_gp_cache); | |
171 | out_free_pr_reg_cache: | |
172 | kmem_cache_destroy(t10_pr_reg_cache); | |
173 | out_free_ua_cache: | |
174 | kmem_cache_destroy(se_ua_cache); | |
175 | out_free_sess_cache: | |
176 | kmem_cache_destroy(se_sess_cache); | |
c66ac9db | 177 | out: |
e3d6f909 | 178 | return -ENOMEM; |
c66ac9db NB |
179 | } |
180 | ||
e3d6f909 | 181 | void release_se_kmem_caches(void) |
c66ac9db | 182 | { |
35e0e757 | 183 | destroy_workqueue(target_completion_wq); |
c66ac9db NB |
184 | kmem_cache_destroy(se_sess_cache); |
185 | kmem_cache_destroy(se_ua_cache); | |
c66ac9db NB |
186 | kmem_cache_destroy(t10_pr_reg_cache); |
187 | kmem_cache_destroy(t10_alua_lu_gp_cache); | |
188 | kmem_cache_destroy(t10_alua_lu_gp_mem_cache); | |
189 | kmem_cache_destroy(t10_alua_tg_pt_gp_cache); | |
190 | kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache); | |
229d4f11 HR |
191 | kmem_cache_destroy(t10_alua_lba_map_cache); |
192 | kmem_cache_destroy(t10_alua_lba_map_mem_cache); | |
c66ac9db NB |
193 | } |
194 | ||
e3d6f909 AG |
195 | /* This code ensures unique mib indexes are handed out. */ |
196 | static DEFINE_SPINLOCK(scsi_mib_index_lock); | |
197 | static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX]; | |
e89d15ee NB |
198 | |
199 | /* | |
200 | * Allocate a new row index for the entry type specified | |
201 | */ | |
202 | u32 scsi_get_new_index(scsi_index_t type) | |
203 | { | |
204 | u32 new_index; | |
205 | ||
e3d6f909 | 206 | BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX)); |
e89d15ee | 207 | |
e3d6f909 AG |
208 | spin_lock(&scsi_mib_index_lock); |
209 | new_index = ++scsi_mib_index[type]; | |
210 | spin_unlock(&scsi_mib_index_lock); | |
e89d15ee NB |
211 | |
212 | return new_index; | |
213 | } | |
214 | ||
dbc5623e | 215 | void transport_subsystem_check_init(void) |
c66ac9db NB |
216 | { |
217 | int ret; | |
283669d2 | 218 | static int sub_api_initialized; |
c66ac9db | 219 | |
dbc5623e NB |
220 | if (sub_api_initialized) |
221 | return; | |
222 | ||
c66ac9db NB |
223 | ret = request_module("target_core_iblock"); |
224 | if (ret != 0) | |
6708bb27 | 225 | pr_err("Unable to load target_core_iblock\n"); |
c66ac9db NB |
226 | |
227 | ret = request_module("target_core_file"); | |
228 | if (ret != 0) | |
6708bb27 | 229 | pr_err("Unable to load target_core_file\n"); |
c66ac9db NB |
230 | |
231 | ret = request_module("target_core_pscsi"); | |
232 | if (ret != 0) | |
6708bb27 | 233 | pr_err("Unable to load target_core_pscsi\n"); |
c66ac9db | 234 | |
7c9e7a6f AG |
235 | ret = request_module("target_core_user"); |
236 | if (ret != 0) | |
237 | pr_err("Unable to load target_core_user\n"); | |
238 | ||
e3d6f909 | 239 | sub_api_initialized = 1; |
c66ac9db NB |
240 | } |
241 | ||
e70beee7 | 242 | struct se_session *transport_init_session(enum target_prot_op sup_prot_ops) |
c66ac9db NB |
243 | { |
244 | struct se_session *se_sess; | |
245 | ||
246 | se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL); | |
6708bb27 AG |
247 | if (!se_sess) { |
248 | pr_err("Unable to allocate struct se_session from" | |
c66ac9db NB |
249 | " se_sess_cache\n"); |
250 | return ERR_PTR(-ENOMEM); | |
251 | } | |
252 | INIT_LIST_HEAD(&se_sess->sess_list); | |
253 | INIT_LIST_HEAD(&se_sess->sess_acl_list); | |
a17f091d | 254 | INIT_LIST_HEAD(&se_sess->sess_cmd_list); |
9b31a328 | 255 | INIT_LIST_HEAD(&se_sess->sess_wait_list); |
a17f091d | 256 | spin_lock_init(&se_sess->sess_cmd_lock); |
41ac82b6 | 257 | kref_init(&se_sess->sess_kref); |
e70beee7 | 258 | se_sess->sup_prot_ops = sup_prot_ops; |
c66ac9db NB |
259 | |
260 | return se_sess; | |
261 | } | |
262 | EXPORT_SYMBOL(transport_init_session); | |
263 | ||
c0add7fd NB |
264 | int transport_alloc_session_tags(struct se_session *se_sess, |
265 | unsigned int tag_num, unsigned int tag_size) | |
266 | { | |
267 | int rc; | |
268 | ||
8c7f6e9b NB |
269 | se_sess->sess_cmd_map = kzalloc(tag_num * tag_size, |
270 | GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT); | |
c0add7fd | 271 | if (!se_sess->sess_cmd_map) { |
8c7f6e9b NB |
272 | se_sess->sess_cmd_map = vzalloc(tag_num * tag_size); |
273 | if (!se_sess->sess_cmd_map) { | |
274 | pr_err("Unable to allocate se_sess->sess_cmd_map\n"); | |
275 | return -ENOMEM; | |
276 | } | |
c0add7fd NB |
277 | } |
278 | ||
279 | rc = percpu_ida_init(&se_sess->sess_tag_pool, tag_num); | |
280 | if (rc < 0) { | |
281 | pr_err("Unable to init se_sess->sess_tag_pool," | |
282 | " tag_num: %u\n", tag_num); | |
8c7f6e9b NB |
283 | if (is_vmalloc_addr(se_sess->sess_cmd_map)) |
284 | vfree(se_sess->sess_cmd_map); | |
285 | else | |
286 | kfree(se_sess->sess_cmd_map); | |
c0add7fd NB |
287 | se_sess->sess_cmd_map = NULL; |
288 | return -ENOMEM; | |
289 | } | |
290 | ||
291 | return 0; | |
292 | } | |
293 | EXPORT_SYMBOL(transport_alloc_session_tags); | |
294 | ||
295 | struct se_session *transport_init_session_tags(unsigned int tag_num, | |
e70beee7 NB |
296 | unsigned int tag_size, |
297 | enum target_prot_op sup_prot_ops) | |
c0add7fd NB |
298 | { |
299 | struct se_session *se_sess; | |
300 | int rc; | |
301 | ||
e70beee7 | 302 | se_sess = transport_init_session(sup_prot_ops); |
c0add7fd NB |
303 | if (IS_ERR(se_sess)) |
304 | return se_sess; | |
305 | ||
306 | rc = transport_alloc_session_tags(se_sess, tag_num, tag_size); | |
307 | if (rc < 0) { | |
308 | transport_free_session(se_sess); | |
309 | return ERR_PTR(-ENOMEM); | |
310 | } | |
311 | ||
312 | return se_sess; | |
313 | } | |
314 | EXPORT_SYMBOL(transport_init_session_tags); | |
315 | ||
c66ac9db | 316 | /* |
140854cb | 317 | * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called. |
c66ac9db NB |
318 | */ |
319 | void __transport_register_session( | |
320 | struct se_portal_group *se_tpg, | |
321 | struct se_node_acl *se_nacl, | |
322 | struct se_session *se_sess, | |
323 | void *fabric_sess_ptr) | |
324 | { | |
38b57f82 | 325 | struct target_core_fabric_ops *tfo = se_tpg->se_tpg_tfo; |
c66ac9db NB |
326 | unsigned char buf[PR_REG_ISID_LEN]; |
327 | ||
328 | se_sess->se_tpg = se_tpg; | |
329 | se_sess->fabric_sess_ptr = fabric_sess_ptr; | |
38b57f82 NB |
330 | /* |
331 | * Determine if fabric allows for T10-PI feature bits to be exposed | |
332 | * to initiators for device backends with !dev->dev_attrib.pi_prot_type | |
333 | */ | |
334 | if (tfo->tpg_check_prot_fabric_only) | |
335 | se_sess->sess_prot_type = tfo->tpg_check_prot_fabric_only(se_tpg); | |
336 | ||
c66ac9db NB |
337 | /* |
338 | * Used by struct se_node_acl's under ConfigFS to locate active se_session-t | |
339 | * | |
340 | * Only set for struct se_session's that will actually be moving I/O. | |
341 | * eg: *NOT* discovery sessions. | |
342 | */ | |
343 | if (se_nacl) { | |
344 | /* | |
345 | * If the fabric module supports an ISID based TransportID, | |
346 | * save this value in binary from the fabric I_T Nexus now. | |
347 | */ | |
e3d6f909 | 348 | if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { |
c66ac9db | 349 | memset(&buf[0], 0, PR_REG_ISID_LEN); |
e3d6f909 | 350 | se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, |
c66ac9db NB |
351 | &buf[0], PR_REG_ISID_LEN); |
352 | se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]); | |
353 | } | |
afb999ff NB |
354 | kref_get(&se_nacl->acl_kref); |
355 | ||
c66ac9db NB |
356 | spin_lock_irq(&se_nacl->nacl_sess_lock); |
357 | /* | |
358 | * The se_nacl->nacl_sess pointer will be set to the | |
359 | * last active I_T Nexus for each struct se_node_acl. | |
360 | */ | |
361 | se_nacl->nacl_sess = se_sess; | |
362 | ||
363 | list_add_tail(&se_sess->sess_acl_list, | |
364 | &se_nacl->acl_sess_list); | |
365 | spin_unlock_irq(&se_nacl->nacl_sess_lock); | |
366 | } | |
367 | list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list); | |
368 | ||
6708bb27 | 369 | pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n", |
e3d6f909 | 370 | se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr); |
c66ac9db NB |
371 | } |
372 | EXPORT_SYMBOL(__transport_register_session); | |
373 | ||
374 | void transport_register_session( | |
375 | struct se_portal_group *se_tpg, | |
376 | struct se_node_acl *se_nacl, | |
377 | struct se_session *se_sess, | |
378 | void *fabric_sess_ptr) | |
379 | { | |
140854cb NB |
380 | unsigned long flags; |
381 | ||
382 | spin_lock_irqsave(&se_tpg->session_lock, flags); | |
c66ac9db | 383 | __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr); |
140854cb | 384 | spin_unlock_irqrestore(&se_tpg->session_lock, flags); |
c66ac9db NB |
385 | } |
386 | EXPORT_SYMBOL(transport_register_session); | |
387 | ||
ecf0dd66 | 388 | static void target_release_session(struct kref *kref) |
41ac82b6 NB |
389 | { |
390 | struct se_session *se_sess = container_of(kref, | |
391 | struct se_session, sess_kref); | |
392 | struct se_portal_group *se_tpg = se_sess->se_tpg; | |
393 | ||
394 | se_tpg->se_tpg_tfo->close_session(se_sess); | |
395 | } | |
396 | ||
397 | void target_get_session(struct se_session *se_sess) | |
398 | { | |
399 | kref_get(&se_sess->sess_kref); | |
400 | } | |
401 | EXPORT_SYMBOL(target_get_session); | |
402 | ||
33933a0e | 403 | void target_put_session(struct se_session *se_sess) |
41ac82b6 | 404 | { |
4149268e JE |
405 | struct se_portal_group *tpg = se_sess->se_tpg; |
406 | ||
407 | if (tpg->se_tpg_tfo->put_session != NULL) { | |
408 | tpg->se_tpg_tfo->put_session(se_sess); | |
409 | return; | |
410 | } | |
33933a0e | 411 | kref_put(&se_sess->sess_kref, target_release_session); |
41ac82b6 NB |
412 | } |
413 | EXPORT_SYMBOL(target_put_session); | |
414 | ||
f8e471f9 NB |
415 | ssize_t target_show_dynamic_sessions(struct se_portal_group *se_tpg, char *page) |
416 | { | |
417 | struct se_session *se_sess; | |
418 | ssize_t len = 0; | |
419 | ||
420 | spin_lock_bh(&se_tpg->session_lock); | |
421 | list_for_each_entry(se_sess, &se_tpg->tpg_sess_list, sess_list) { | |
422 | if (!se_sess->se_node_acl) | |
423 | continue; | |
424 | if (!se_sess->se_node_acl->dynamic_node_acl) | |
425 | continue; | |
426 | if (strlen(se_sess->se_node_acl->initiatorname) + 1 + len > PAGE_SIZE) | |
427 | break; | |
428 | ||
429 | len += snprintf(page + len, PAGE_SIZE - len, "%s\n", | |
430 | se_sess->se_node_acl->initiatorname); | |
431 | len += 1; /* Include NULL terminator */ | |
432 | } | |
433 | spin_unlock_bh(&se_tpg->session_lock); | |
434 | ||
435 | return len; | |
436 | } | |
437 | EXPORT_SYMBOL(target_show_dynamic_sessions); | |
438 | ||
afb999ff NB |
439 | static void target_complete_nacl(struct kref *kref) |
440 | { | |
441 | struct se_node_acl *nacl = container_of(kref, | |
442 | struct se_node_acl, acl_kref); | |
443 | ||
444 | complete(&nacl->acl_free_comp); | |
445 | } | |
446 | ||
447 | void target_put_nacl(struct se_node_acl *nacl) | |
448 | { | |
449 | kref_put(&nacl->acl_kref, target_complete_nacl); | |
450 | } | |
451 | ||
c66ac9db NB |
452 | void transport_deregister_session_configfs(struct se_session *se_sess) |
453 | { | |
454 | struct se_node_acl *se_nacl; | |
23388864 | 455 | unsigned long flags; |
c66ac9db NB |
456 | /* |
457 | * Used by struct se_node_acl's under ConfigFS to locate active struct se_session | |
458 | */ | |
459 | se_nacl = se_sess->se_node_acl; | |
6708bb27 | 460 | if (se_nacl) { |
23388864 | 461 | spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags); |
337c0607 NB |
462 | if (se_nacl->acl_stop == 0) |
463 | list_del(&se_sess->sess_acl_list); | |
c66ac9db NB |
464 | /* |
465 | * If the session list is empty, then clear the pointer. | |
466 | * Otherwise, set the struct se_session pointer from the tail | |
467 | * element of the per struct se_node_acl active session list. | |
468 | */ | |
469 | if (list_empty(&se_nacl->acl_sess_list)) | |
470 | se_nacl->nacl_sess = NULL; | |
471 | else { | |
472 | se_nacl->nacl_sess = container_of( | |
473 | se_nacl->acl_sess_list.prev, | |
474 | struct se_session, sess_acl_list); | |
475 | } | |
23388864 | 476 | spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags); |
c66ac9db NB |
477 | } |
478 | } | |
479 | EXPORT_SYMBOL(transport_deregister_session_configfs); | |
480 | ||
481 | void transport_free_session(struct se_session *se_sess) | |
482 | { | |
c0add7fd NB |
483 | if (se_sess->sess_cmd_map) { |
484 | percpu_ida_destroy(&se_sess->sess_tag_pool); | |
8c7f6e9b NB |
485 | if (is_vmalloc_addr(se_sess->sess_cmd_map)) |
486 | vfree(se_sess->sess_cmd_map); | |
487 | else | |
488 | kfree(se_sess->sess_cmd_map); | |
c0add7fd | 489 | } |
c66ac9db NB |
490 | kmem_cache_free(se_sess_cache, se_sess); |
491 | } | |
492 | EXPORT_SYMBOL(transport_free_session); | |
493 | ||
494 | void transport_deregister_session(struct se_session *se_sess) | |
495 | { | |
496 | struct se_portal_group *se_tpg = se_sess->se_tpg; | |
01468346 | 497 | struct target_core_fabric_ops *se_tfo; |
c66ac9db | 498 | struct se_node_acl *se_nacl; |
e63a8e19 | 499 | unsigned long flags; |
01468346 | 500 | bool comp_nacl = true; |
c66ac9db | 501 | |
6708bb27 | 502 | if (!se_tpg) { |
c66ac9db NB |
503 | transport_free_session(se_sess); |
504 | return; | |
505 | } | |
01468346 | 506 | se_tfo = se_tpg->se_tpg_tfo; |
c66ac9db | 507 | |
e63a8e19 | 508 | spin_lock_irqsave(&se_tpg->session_lock, flags); |
c66ac9db NB |
509 | list_del(&se_sess->sess_list); |
510 | se_sess->se_tpg = NULL; | |
511 | se_sess->fabric_sess_ptr = NULL; | |
e63a8e19 | 512 | spin_unlock_irqrestore(&se_tpg->session_lock, flags); |
c66ac9db NB |
513 | |
514 | /* | |
515 | * Determine if we need to do extra work for this initiator node's | |
516 | * struct se_node_acl if it had been previously dynamically generated. | |
517 | */ | |
518 | se_nacl = se_sess->se_node_acl; | |
01468346 NB |
519 | |
520 | spin_lock_irqsave(&se_tpg->acl_node_lock, flags); | |
521 | if (se_nacl && se_nacl->dynamic_node_acl) { | |
522 | if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) { | |
523 | list_del(&se_nacl->acl_list); | |
524 | se_tpg->num_node_acls--; | |
525 | spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags); | |
526 | core_tpg_wait_for_nacl_pr_ref(se_nacl); | |
527 | core_free_device_list_for_node(se_nacl, se_tpg); | |
528 | se_tfo->tpg_release_fabric_acl(se_tpg, se_nacl); | |
529 | ||
530 | comp_nacl = false; | |
531 | spin_lock_irqsave(&se_tpg->acl_node_lock, flags); | |
c66ac9db | 532 | } |
c66ac9db | 533 | } |
01468346 | 534 | spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags); |
c66ac9db | 535 | |
6708bb27 | 536 | pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n", |
e3d6f909 | 537 | se_tpg->se_tpg_tfo->get_fabric_name()); |
01468346 | 538 | /* |
125d0119 | 539 | * If last kref is dropping now for an explicit NodeACL, awake sleeping |
afb999ff NB |
540 | * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group |
541 | * removal context. | |
01468346 | 542 | */ |
0bcc297e | 543 | if (se_nacl && comp_nacl) |
afb999ff | 544 | target_put_nacl(se_nacl); |
01468346 | 545 | |
afb999ff | 546 | transport_free_session(se_sess); |
c66ac9db NB |
547 | } |
548 | EXPORT_SYMBOL(transport_deregister_session); | |
549 | ||
550 | /* | |
a1d8b49a | 551 | * Called with cmd->t_state_lock held. |
c66ac9db | 552 | */ |
cf572a96 | 553 | static void target_remove_from_state_list(struct se_cmd *cmd) |
c66ac9db | 554 | { |
42bf829e | 555 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
556 | unsigned long flags; |
557 | ||
42bf829e CH |
558 | if (!dev) |
559 | return; | |
c66ac9db | 560 | |
cf572a96 CH |
561 | if (cmd->transport_state & CMD_T_BUSY) |
562 | return; | |
c66ac9db | 563 | |
cf572a96 CH |
564 | spin_lock_irqsave(&dev->execute_task_lock, flags); |
565 | if (cmd->state_active) { | |
566 | list_del(&cmd->state_list); | |
cf572a96 | 567 | cmd->state_active = false; |
c66ac9db | 568 | } |
cf572a96 | 569 | spin_unlock_irqrestore(&dev->execute_task_lock, flags); |
c66ac9db NB |
570 | } |
571 | ||
862e6389 NB |
572 | static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists, |
573 | bool write_pending) | |
c66ac9db NB |
574 | { |
575 | unsigned long flags; | |
576 | ||
a1d8b49a | 577 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
862e6389 NB |
578 | if (write_pending) |
579 | cmd->t_state = TRANSPORT_WRITE_PENDING; | |
580 | ||
f7113a47 CH |
581 | if (remove_from_lists) { |
582 | target_remove_from_state_list(cmd); | |
583 | ||
584 | /* | |
585 | * Clear struct se_cmd->se_lun before the handoff to FE. | |
586 | */ | |
587 | cmd->se_lun = NULL; | |
588 | } | |
589 | ||
c66ac9db NB |
590 | /* |
591 | * Determine if frontend context caller is requesting the stopping of | |
e3d6f909 | 592 | * this command for frontend exceptions. |
c66ac9db | 593 | */ |
7d680f3b CH |
594 | if (cmd->transport_state & CMD_T_STOP) { |
595 | pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n", | |
596 | __func__, __LINE__, | |
e3d6f909 | 597 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 598 | |
a1d8b49a | 599 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 600 | |
a95d6511 | 601 | complete_all(&cmd->t_transport_stop_comp); |
c66ac9db NB |
602 | return 1; |
603 | } | |
f7113a47 CH |
604 | |
605 | cmd->transport_state &= ~CMD_T_ACTIVE; | |
606 | if (remove_from_lists) { | |
607 | /* | |
608 | * Some fabric modules like tcm_loop can release | |
609 | * their internally allocated I/O reference now and | |
610 | * struct se_cmd now. | |
611 | * | |
612 | * Fabric modules are expected to return '1' here if the | |
613 | * se_cmd being passed is released at this point, | |
614 | * or zero if not being released. | |
615 | */ | |
616 | if (cmd->se_tfo->check_stop_free != NULL) { | |
617 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
618 | return cmd->se_tfo->check_stop_free(cmd); | |
c66ac9db | 619 | } |
f7113a47 | 620 | } |
c66ac9db | 621 | |
a1d8b49a | 622 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
623 | return 0; |
624 | } | |
625 | ||
626 | static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd) | |
627 | { | |
862e6389 | 628 | return transport_cmd_check_stop(cmd, true, false); |
c66ac9db NB |
629 | } |
630 | ||
631 | static void transport_lun_remove_cmd(struct se_cmd *cmd) | |
632 | { | |
e3d6f909 | 633 | struct se_lun *lun = cmd->se_lun; |
c66ac9db | 634 | |
5259a06e | 635 | if (!lun) |
c66ac9db NB |
636 | return; |
637 | ||
5259a06e NB |
638 | if (cmpxchg(&cmd->lun_ref_active, true, false)) |
639 | percpu_ref_put(&lun->lun_ref); | |
c66ac9db NB |
640 | } |
641 | ||
642 | void transport_cmd_finish_abort(struct se_cmd *cmd, int remove) | |
643 | { | |
68259b5a AL |
644 | if (cmd->se_cmd_flags & SCF_SE_LUN_CMD) |
645 | transport_lun_remove_cmd(cmd); | |
131e6abc NB |
646 | /* |
647 | * Allow the fabric driver to unmap any resources before | |
648 | * releasing the descriptor via TFO->release_cmd() | |
649 | */ | |
650 | if (remove) | |
651 | cmd->se_tfo->aborted_task(cmd); | |
68259b5a | 652 | |
c66ac9db NB |
653 | if (transport_cmd_check_stop_to_fabric(cmd)) |
654 | return; | |
af877292 | 655 | if (remove) |
e6a2573f | 656 | transport_put_cmd(cmd); |
c66ac9db NB |
657 | } |
658 | ||
35e0e757 CH |
659 | static void target_complete_failure_work(struct work_struct *work) |
660 | { | |
661 | struct se_cmd *cmd = container_of(work, struct se_cmd, work); | |
662 | ||
de103c93 CH |
663 | transport_generic_request_failure(cmd, |
664 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE); | |
35e0e757 CH |
665 | } |
666 | ||
6138ed2a | 667 | /* |
d5829eac PB |
668 | * Used when asking transport to copy Sense Data from the underlying |
669 | * Linux/SCSI struct scsi_cmnd | |
6138ed2a | 670 | */ |
d5829eac | 671 | static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd) |
6138ed2a | 672 | { |
6138ed2a | 673 | struct se_device *dev = cmd->se_dev; |
6138ed2a PB |
674 | |
675 | WARN_ON(!cmd->se_lun); | |
676 | ||
677 | if (!dev) | |
d5829eac | 678 | return NULL; |
6138ed2a | 679 | |
d5829eac PB |
680 | if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) |
681 | return NULL; | |
6138ed2a | 682 | |
9c58b7dd | 683 | cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER; |
6138ed2a | 684 | |
d5829eac | 685 | pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n", |
6138ed2a | 686 | dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status); |
9c58b7dd | 687 | return cmd->sense_buffer; |
6138ed2a PB |
688 | } |
689 | ||
5787cacd | 690 | void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status) |
c66ac9db | 691 | { |
42bf829e | 692 | struct se_device *dev = cmd->se_dev; |
5787cacd | 693 | int success = scsi_status == GOOD; |
c66ac9db | 694 | unsigned long flags; |
c66ac9db | 695 | |
5787cacd CH |
696 | cmd->scsi_status = scsi_status; |
697 | ||
698 | ||
a1d8b49a | 699 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
cf572a96 | 700 | cmd->transport_state &= ~CMD_T_BUSY; |
c66ac9db | 701 | |
c66ac9db | 702 | if (dev && dev->transport->transport_complete) { |
d5829eac PB |
703 | dev->transport->transport_complete(cmd, |
704 | cmd->t_data_sg, | |
705 | transport_get_sense_buffer(cmd)); | |
706 | if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) | |
c66ac9db | 707 | success = 1; |
c66ac9db NB |
708 | } |
709 | ||
710 | /* | |
5787cacd | 711 | * See if we are waiting to complete for an exception condition. |
c66ac9db | 712 | */ |
cf572a96 | 713 | if (cmd->transport_state & CMD_T_REQUEST_STOP) { |
a1d8b49a | 714 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
cf572a96 | 715 | complete(&cmd->task_stop_comp); |
c66ac9db NB |
716 | return; |
717 | } | |
2235007c | 718 | |
3d28934a | 719 | /* |
125d0119 | 720 | * Check for case where an explicit ABORT_TASK has been received |
3d28934a NB |
721 | * and transport_wait_for_tasks() will be waiting for completion.. |
722 | */ | |
723 | if (cmd->transport_state & CMD_T_ABORTED && | |
724 | cmd->transport_state & CMD_T_STOP) { | |
725 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
a95d6511 | 726 | complete_all(&cmd->t_transport_stop_comp); |
3d28934a | 727 | return; |
3dca1471 | 728 | } else if (!success) { |
35e0e757 | 729 | INIT_WORK(&cmd->work, target_complete_failure_work); |
c66ac9db | 730 | } else { |
35e0e757 | 731 | INIT_WORK(&cmd->work, target_complete_ok_work); |
c66ac9db | 732 | } |
35e0e757 | 733 | |
35e0e757 | 734 | cmd->t_state = TRANSPORT_COMPLETE; |
3d28934a | 735 | cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE); |
a1d8b49a | 736 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 737 | |
35e0e757 | 738 | queue_work(target_completion_wq, &cmd->work); |
c66ac9db | 739 | } |
6bb35e00 CH |
740 | EXPORT_SYMBOL(target_complete_cmd); |
741 | ||
2426bd45 RD |
742 | void target_complete_cmd_with_length(struct se_cmd *cmd, u8 scsi_status, int length) |
743 | { | |
744 | if (scsi_status == SAM_STAT_GOOD && length < cmd->data_length) { | |
745 | if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) { | |
746 | cmd->residual_count += cmd->data_length - length; | |
747 | } else { | |
748 | cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT; | |
749 | cmd->residual_count = cmd->data_length - length; | |
750 | } | |
751 | ||
752 | cmd->data_length = length; | |
753 | } | |
754 | ||
755 | target_complete_cmd(cmd, scsi_status); | |
756 | } | |
757 | EXPORT_SYMBOL(target_complete_cmd_with_length); | |
758 | ||
cf572a96 | 759 | static void target_add_to_state_list(struct se_cmd *cmd) |
c66ac9db | 760 | { |
cf572a96 CH |
761 | struct se_device *dev = cmd->se_dev; |
762 | unsigned long flags; | |
c66ac9db | 763 | |
cf572a96 CH |
764 | spin_lock_irqsave(&dev->execute_task_lock, flags); |
765 | if (!cmd->state_active) { | |
766 | list_add_tail(&cmd->state_list, &dev->state_list); | |
767 | cmd->state_active = true; | |
c66ac9db | 768 | } |
cf572a96 | 769 | spin_unlock_irqrestore(&dev->execute_task_lock, flags); |
c66ac9db NB |
770 | } |
771 | ||
07bde79a | 772 | /* |
f147abb4 | 773 | * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status |
07bde79a | 774 | */ |
7a6f0a1e CH |
775 | static void transport_write_pending_qf(struct se_cmd *cmd); |
776 | static void transport_complete_qf(struct se_cmd *cmd); | |
07bde79a | 777 | |
0fd97ccf | 778 | void target_qf_do_work(struct work_struct *work) |
07bde79a NB |
779 | { |
780 | struct se_device *dev = container_of(work, struct se_device, | |
781 | qf_work_queue); | |
bcac364a | 782 | LIST_HEAD(qf_cmd_list); |
07bde79a NB |
783 | struct se_cmd *cmd, *cmd_tmp; |
784 | ||
785 | spin_lock_irq(&dev->qf_cmd_lock); | |
bcac364a RD |
786 | list_splice_init(&dev->qf_cmd_list, &qf_cmd_list); |
787 | spin_unlock_irq(&dev->qf_cmd_lock); | |
07bde79a | 788 | |
bcac364a | 789 | list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) { |
07bde79a | 790 | list_del(&cmd->se_qf_node); |
33940d09 | 791 | atomic_dec_mb(&dev->dev_qf_count); |
07bde79a | 792 | |
6708bb27 | 793 | pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue" |
07bde79a | 794 | " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd, |
e057f533 | 795 | (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" : |
07bde79a NB |
796 | (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING" |
797 | : "UNKNOWN"); | |
f7a5cc0b | 798 | |
7a6f0a1e CH |
799 | if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) |
800 | transport_write_pending_qf(cmd); | |
801 | else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) | |
802 | transport_complete_qf(cmd); | |
07bde79a | 803 | } |
07bde79a NB |
804 | } |
805 | ||
c66ac9db NB |
806 | unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd) |
807 | { | |
808 | switch (cmd->data_direction) { | |
809 | case DMA_NONE: | |
810 | return "NONE"; | |
811 | case DMA_FROM_DEVICE: | |
812 | return "READ"; | |
813 | case DMA_TO_DEVICE: | |
814 | return "WRITE"; | |
815 | case DMA_BIDIRECTIONAL: | |
816 | return "BIDI"; | |
817 | default: | |
818 | break; | |
819 | } | |
820 | ||
821 | return "UNKNOWN"; | |
822 | } | |
823 | ||
824 | void transport_dump_dev_state( | |
825 | struct se_device *dev, | |
826 | char *b, | |
827 | int *bl) | |
828 | { | |
829 | *bl += sprintf(b + *bl, "Status: "); | |
0fd97ccf | 830 | if (dev->export_count) |
c66ac9db | 831 | *bl += sprintf(b + *bl, "ACTIVATED"); |
0fd97ccf | 832 | else |
c66ac9db | 833 | *bl += sprintf(b + *bl, "DEACTIVATED"); |
c66ac9db | 834 | |
5f41a31d | 835 | *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth); |
11e764bd | 836 | *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n", |
0fd97ccf CH |
837 | dev->dev_attrib.block_size, |
838 | dev->dev_attrib.hw_max_sectors); | |
c66ac9db NB |
839 | *bl += sprintf(b + *bl, " "); |
840 | } | |
841 | ||
c66ac9db NB |
842 | void transport_dump_vpd_proto_id( |
843 | struct t10_vpd *vpd, | |
844 | unsigned char *p_buf, | |
845 | int p_buf_len) | |
846 | { | |
847 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
848 | int len; | |
849 | ||
850 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
851 | len = sprintf(buf, "T10 VPD Protocol Identifier: "); | |
852 | ||
853 | switch (vpd->protocol_identifier) { | |
854 | case 0x00: | |
855 | sprintf(buf+len, "Fibre Channel\n"); | |
856 | break; | |
857 | case 0x10: | |
858 | sprintf(buf+len, "Parallel SCSI\n"); | |
859 | break; | |
860 | case 0x20: | |
861 | sprintf(buf+len, "SSA\n"); | |
862 | break; | |
863 | case 0x30: | |
864 | sprintf(buf+len, "IEEE 1394\n"); | |
865 | break; | |
866 | case 0x40: | |
867 | sprintf(buf+len, "SCSI Remote Direct Memory Access" | |
868 | " Protocol\n"); | |
869 | break; | |
870 | case 0x50: | |
871 | sprintf(buf+len, "Internet SCSI (iSCSI)\n"); | |
872 | break; | |
873 | case 0x60: | |
874 | sprintf(buf+len, "SAS Serial SCSI Protocol\n"); | |
875 | break; | |
876 | case 0x70: | |
877 | sprintf(buf+len, "Automation/Drive Interface Transport" | |
878 | " Protocol\n"); | |
879 | break; | |
880 | case 0x80: | |
881 | sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n"); | |
882 | break; | |
883 | default: | |
884 | sprintf(buf+len, "Unknown 0x%02x\n", | |
885 | vpd->protocol_identifier); | |
886 | break; | |
887 | } | |
888 | ||
889 | if (p_buf) | |
890 | strncpy(p_buf, buf, p_buf_len); | |
891 | else | |
6708bb27 | 892 | pr_debug("%s", buf); |
c66ac9db NB |
893 | } |
894 | ||
895 | void | |
896 | transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83) | |
897 | { | |
898 | /* | |
899 | * Check if the Protocol Identifier Valid (PIV) bit is set.. | |
900 | * | |
901 | * from spc3r23.pdf section 7.5.1 | |
902 | */ | |
903 | if (page_83[1] & 0x80) { | |
904 | vpd->protocol_identifier = (page_83[0] & 0xf0); | |
905 | vpd->protocol_identifier_set = 1; | |
906 | transport_dump_vpd_proto_id(vpd, NULL, 0); | |
907 | } | |
908 | } | |
909 | EXPORT_SYMBOL(transport_set_vpd_proto_id); | |
910 | ||
911 | int transport_dump_vpd_assoc( | |
912 | struct t10_vpd *vpd, | |
913 | unsigned char *p_buf, | |
914 | int p_buf_len) | |
915 | { | |
916 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
e3d6f909 AG |
917 | int ret = 0; |
918 | int len; | |
c66ac9db NB |
919 | |
920 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
921 | len = sprintf(buf, "T10 VPD Identifier Association: "); | |
922 | ||
923 | switch (vpd->association) { | |
924 | case 0x00: | |
925 | sprintf(buf+len, "addressed logical unit\n"); | |
926 | break; | |
927 | case 0x10: | |
928 | sprintf(buf+len, "target port\n"); | |
929 | break; | |
930 | case 0x20: | |
931 | sprintf(buf+len, "SCSI target device\n"); | |
932 | break; | |
933 | default: | |
934 | sprintf(buf+len, "Unknown 0x%02x\n", vpd->association); | |
e3d6f909 | 935 | ret = -EINVAL; |
c66ac9db NB |
936 | break; |
937 | } | |
938 | ||
939 | if (p_buf) | |
940 | strncpy(p_buf, buf, p_buf_len); | |
941 | else | |
6708bb27 | 942 | pr_debug("%s", buf); |
c66ac9db NB |
943 | |
944 | return ret; | |
945 | } | |
946 | ||
947 | int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83) | |
948 | { | |
949 | /* | |
950 | * The VPD identification association.. | |
951 | * | |
952 | * from spc3r23.pdf Section 7.6.3.1 Table 297 | |
953 | */ | |
954 | vpd->association = (page_83[1] & 0x30); | |
955 | return transport_dump_vpd_assoc(vpd, NULL, 0); | |
956 | } | |
957 | EXPORT_SYMBOL(transport_set_vpd_assoc); | |
958 | ||
959 | int transport_dump_vpd_ident_type( | |
960 | struct t10_vpd *vpd, | |
961 | unsigned char *p_buf, | |
962 | int p_buf_len) | |
963 | { | |
964 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
e3d6f909 AG |
965 | int ret = 0; |
966 | int len; | |
c66ac9db NB |
967 | |
968 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
969 | len = sprintf(buf, "T10 VPD Identifier Type: "); | |
970 | ||
971 | switch (vpd->device_identifier_type) { | |
972 | case 0x00: | |
973 | sprintf(buf+len, "Vendor specific\n"); | |
974 | break; | |
975 | case 0x01: | |
976 | sprintf(buf+len, "T10 Vendor ID based\n"); | |
977 | break; | |
978 | case 0x02: | |
979 | sprintf(buf+len, "EUI-64 based\n"); | |
980 | break; | |
981 | case 0x03: | |
982 | sprintf(buf+len, "NAA\n"); | |
983 | break; | |
984 | case 0x04: | |
985 | sprintf(buf+len, "Relative target port identifier\n"); | |
986 | break; | |
987 | case 0x08: | |
988 | sprintf(buf+len, "SCSI name string\n"); | |
989 | break; | |
990 | default: | |
991 | sprintf(buf+len, "Unsupported: 0x%02x\n", | |
992 | vpd->device_identifier_type); | |
e3d6f909 | 993 | ret = -EINVAL; |
c66ac9db NB |
994 | break; |
995 | } | |
996 | ||
e3d6f909 AG |
997 | if (p_buf) { |
998 | if (p_buf_len < strlen(buf)+1) | |
999 | return -EINVAL; | |
c66ac9db | 1000 | strncpy(p_buf, buf, p_buf_len); |
e3d6f909 | 1001 | } else { |
6708bb27 | 1002 | pr_debug("%s", buf); |
e3d6f909 | 1003 | } |
c66ac9db NB |
1004 | |
1005 | return ret; | |
1006 | } | |
1007 | ||
1008 | int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83) | |
1009 | { | |
1010 | /* | |
1011 | * The VPD identifier type.. | |
1012 | * | |
1013 | * from spc3r23.pdf Section 7.6.3.1 Table 298 | |
1014 | */ | |
1015 | vpd->device_identifier_type = (page_83[1] & 0x0f); | |
1016 | return transport_dump_vpd_ident_type(vpd, NULL, 0); | |
1017 | } | |
1018 | EXPORT_SYMBOL(transport_set_vpd_ident_type); | |
1019 | ||
1020 | int transport_dump_vpd_ident( | |
1021 | struct t10_vpd *vpd, | |
1022 | unsigned char *p_buf, | |
1023 | int p_buf_len) | |
1024 | { | |
1025 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
1026 | int ret = 0; | |
1027 | ||
1028 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
1029 | ||
1030 | switch (vpd->device_identifier_code_set) { | |
1031 | case 0x01: /* Binary */ | |
703d641d DC |
1032 | snprintf(buf, sizeof(buf), |
1033 | "T10 VPD Binary Device Identifier: %s\n", | |
c66ac9db NB |
1034 | &vpd->device_identifier[0]); |
1035 | break; | |
1036 | case 0x02: /* ASCII */ | |
703d641d DC |
1037 | snprintf(buf, sizeof(buf), |
1038 | "T10 VPD ASCII Device Identifier: %s\n", | |
c66ac9db NB |
1039 | &vpd->device_identifier[0]); |
1040 | break; | |
1041 | case 0x03: /* UTF-8 */ | |
703d641d DC |
1042 | snprintf(buf, sizeof(buf), |
1043 | "T10 VPD UTF-8 Device Identifier: %s\n", | |
c66ac9db NB |
1044 | &vpd->device_identifier[0]); |
1045 | break; | |
1046 | default: | |
1047 | sprintf(buf, "T10 VPD Device Identifier encoding unsupported:" | |
1048 | " 0x%02x", vpd->device_identifier_code_set); | |
e3d6f909 | 1049 | ret = -EINVAL; |
c66ac9db NB |
1050 | break; |
1051 | } | |
1052 | ||
1053 | if (p_buf) | |
1054 | strncpy(p_buf, buf, p_buf_len); | |
1055 | else | |
6708bb27 | 1056 | pr_debug("%s", buf); |
c66ac9db NB |
1057 | |
1058 | return ret; | |
1059 | } | |
1060 | ||
1061 | int | |
1062 | transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83) | |
1063 | { | |
1064 | static const char hex_str[] = "0123456789abcdef"; | |
35d1efe8 | 1065 | int j = 0, i = 4; /* offset to start of the identifier */ |
c66ac9db NB |
1066 | |
1067 | /* | |
1068 | * The VPD Code Set (encoding) | |
1069 | * | |
1070 | * from spc3r23.pdf Section 7.6.3.1 Table 296 | |
1071 | */ | |
1072 | vpd->device_identifier_code_set = (page_83[0] & 0x0f); | |
1073 | switch (vpd->device_identifier_code_set) { | |
1074 | case 0x01: /* Binary */ | |
1075 | vpd->device_identifier[j++] = | |
1076 | hex_str[vpd->device_identifier_type]; | |
1077 | while (i < (4 + page_83[3])) { | |
1078 | vpd->device_identifier[j++] = | |
1079 | hex_str[(page_83[i] & 0xf0) >> 4]; | |
1080 | vpd->device_identifier[j++] = | |
1081 | hex_str[page_83[i] & 0x0f]; | |
1082 | i++; | |
1083 | } | |
1084 | break; | |
1085 | case 0x02: /* ASCII */ | |
1086 | case 0x03: /* UTF-8 */ | |
1087 | while (i < (4 + page_83[3])) | |
1088 | vpd->device_identifier[j++] = page_83[i++]; | |
1089 | break; | |
1090 | default: | |
1091 | break; | |
1092 | } | |
1093 | ||
1094 | return transport_dump_vpd_ident(vpd, NULL, 0); | |
1095 | } | |
1096 | EXPORT_SYMBOL(transport_set_vpd_ident); | |
1097 | ||
de103c93 CH |
1098 | sense_reason_t |
1099 | target_cmd_size_check(struct se_cmd *cmd, unsigned int size) | |
9b3b8041 CH |
1100 | { |
1101 | struct se_device *dev = cmd->se_dev; | |
1102 | ||
1103 | if (cmd->unknown_data_length) { | |
1104 | cmd->data_length = size; | |
1105 | } else if (size != cmd->data_length) { | |
1106 | pr_warn("TARGET_CORE[%s]: Expected Transfer Length:" | |
1107 | " %u does not match SCSI CDB Length: %u for SAM Opcode:" | |
1108 | " 0x%02x\n", cmd->se_tfo->get_fabric_name(), | |
1109 | cmd->data_length, size, cmd->t_task_cdb[0]); | |
1110 | ||
9b3b8041 CH |
1111 | if (cmd->data_direction == DMA_TO_DEVICE) { |
1112 | pr_err("Rejecting underflow/overflow" | |
1113 | " WRITE data\n"); | |
de103c93 | 1114 | return TCM_INVALID_CDB_FIELD; |
9b3b8041 CH |
1115 | } |
1116 | /* | |
1117 | * Reject READ_* or WRITE_* with overflow/underflow for | |
1118 | * type SCF_SCSI_DATA_CDB. | |
1119 | */ | |
0fd97ccf | 1120 | if (dev->dev_attrib.block_size != 512) { |
9b3b8041 CH |
1121 | pr_err("Failing OVERFLOW/UNDERFLOW for LBA op" |
1122 | " CDB on non 512-byte sector setup subsystem" | |
1123 | " plugin: %s\n", dev->transport->name); | |
1124 | /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */ | |
de103c93 | 1125 | return TCM_INVALID_CDB_FIELD; |
9b3b8041 | 1126 | } |
4c054ba6 NB |
1127 | /* |
1128 | * For the overflow case keep the existing fabric provided | |
1129 | * ->data_length. Otherwise for the underflow case, reset | |
1130 | * ->data_length to the smaller SCSI expected data transfer | |
1131 | * length. | |
1132 | */ | |
9b3b8041 CH |
1133 | if (size > cmd->data_length) { |
1134 | cmd->se_cmd_flags |= SCF_OVERFLOW_BIT; | |
1135 | cmd->residual_count = (size - cmd->data_length); | |
1136 | } else { | |
1137 | cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT; | |
1138 | cmd->residual_count = (cmd->data_length - size); | |
4c054ba6 | 1139 | cmd->data_length = size; |
9b3b8041 | 1140 | } |
9b3b8041 CH |
1141 | } |
1142 | ||
1143 | return 0; | |
1144 | ||
9b3b8041 CH |
1145 | } |
1146 | ||
c66ac9db NB |
1147 | /* |
1148 | * Used by fabric modules containing a local struct se_cmd within their | |
1149 | * fabric dependent per I/O descriptor. | |
1150 | */ | |
1151 | void transport_init_se_cmd( | |
1152 | struct se_cmd *cmd, | |
1153 | struct target_core_fabric_ops *tfo, | |
1154 | struct se_session *se_sess, | |
1155 | u32 data_length, | |
1156 | int data_direction, | |
1157 | int task_attr, | |
1158 | unsigned char *sense_buffer) | |
1159 | { | |
5951146d | 1160 | INIT_LIST_HEAD(&cmd->se_delayed_node); |
07bde79a | 1161 | INIT_LIST_HEAD(&cmd->se_qf_node); |
a17f091d | 1162 | INIT_LIST_HEAD(&cmd->se_cmd_list); |
cf572a96 | 1163 | INIT_LIST_HEAD(&cmd->state_list); |
a1d8b49a | 1164 | init_completion(&cmd->t_transport_stop_comp); |
a17f091d | 1165 | init_completion(&cmd->cmd_wait_comp); |
cf572a96 | 1166 | init_completion(&cmd->task_stop_comp); |
a1d8b49a | 1167 | spin_lock_init(&cmd->t_state_lock); |
1e1110c4 | 1168 | kref_init(&cmd->cmd_kref); |
7d680f3b | 1169 | cmd->transport_state = CMD_T_DEV_ACTIVE; |
c66ac9db NB |
1170 | |
1171 | cmd->se_tfo = tfo; | |
1172 | cmd->se_sess = se_sess; | |
1173 | cmd->data_length = data_length; | |
1174 | cmd->data_direction = data_direction; | |
1175 | cmd->sam_task_attr = task_attr; | |
1176 | cmd->sense_buffer = sense_buffer; | |
cf572a96 CH |
1177 | |
1178 | cmd->state_active = false; | |
c66ac9db NB |
1179 | } |
1180 | EXPORT_SYMBOL(transport_init_se_cmd); | |
1181 | ||
de103c93 CH |
1182 | static sense_reason_t |
1183 | transport_check_alloc_task_attr(struct se_cmd *cmd) | |
c66ac9db | 1184 | { |
019c4ca6 CH |
1185 | struct se_device *dev = cmd->se_dev; |
1186 | ||
c66ac9db NB |
1187 | /* |
1188 | * Check if SAM Task Attribute emulation is enabled for this | |
1189 | * struct se_device storage object | |
1190 | */ | |
019c4ca6 | 1191 | if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) |
c66ac9db NB |
1192 | return 0; |
1193 | ||
68d81f40 | 1194 | if (cmd->sam_task_attr == TCM_ACA_TAG) { |
6708bb27 | 1195 | pr_debug("SAM Task Attribute ACA" |
c66ac9db | 1196 | " emulation is not supported\n"); |
de103c93 | 1197 | return TCM_INVALID_CDB_FIELD; |
c66ac9db NB |
1198 | } |
1199 | /* | |
1200 | * Used to determine when ORDERED commands should go from | |
1201 | * Dormant to Active status. | |
1202 | */ | |
019c4ca6 | 1203 | cmd->se_ordered_id = atomic_inc_return(&dev->dev_ordered_id); |
6708bb27 | 1204 | pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n", |
c66ac9db | 1205 | cmd->se_ordered_id, cmd->sam_task_attr, |
019c4ca6 | 1206 | dev->transport->name); |
c66ac9db NB |
1207 | return 0; |
1208 | } | |
1209 | ||
de103c93 CH |
1210 | sense_reason_t |
1211 | target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb) | |
c66ac9db | 1212 | { |
0fd97ccf | 1213 | struct se_device *dev = cmd->se_dev; |
de103c93 | 1214 | sense_reason_t ret; |
c66ac9db | 1215 | |
c66ac9db NB |
1216 | /* |
1217 | * Ensure that the received CDB is less than the max (252 + 8) bytes | |
1218 | * for VARIABLE_LENGTH_CMD | |
1219 | */ | |
1220 | if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) { | |
6708bb27 | 1221 | pr_err("Received SCSI CDB with command_size: %d that" |
c66ac9db NB |
1222 | " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n", |
1223 | scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE); | |
de103c93 | 1224 | return TCM_INVALID_CDB_FIELD; |
c66ac9db NB |
1225 | } |
1226 | /* | |
1227 | * If the received CDB is larger than TCM_MAX_COMMAND_SIZE, | |
1228 | * allocate the additional extended CDB buffer now.. Otherwise | |
1229 | * setup the pointer from __t_task_cdb to t_task_cdb. | |
1230 | */ | |
a1d8b49a AG |
1231 | if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) { |
1232 | cmd->t_task_cdb = kzalloc(scsi_command_size(cdb), | |
c66ac9db | 1233 | GFP_KERNEL); |
6708bb27 AG |
1234 | if (!cmd->t_task_cdb) { |
1235 | pr_err("Unable to allocate cmd->t_task_cdb" | |
a1d8b49a | 1236 | " %u > sizeof(cmd->__t_task_cdb): %lu ops\n", |
c66ac9db | 1237 | scsi_command_size(cdb), |
a1d8b49a | 1238 | (unsigned long)sizeof(cmd->__t_task_cdb)); |
de103c93 | 1239 | return TCM_OUT_OF_RESOURCES; |
c66ac9db NB |
1240 | } |
1241 | } else | |
a1d8b49a | 1242 | cmd->t_task_cdb = &cmd->__t_task_cdb[0]; |
c66ac9db | 1243 | /* |
a1d8b49a | 1244 | * Copy the original CDB into cmd-> |
c66ac9db | 1245 | */ |
a1d8b49a | 1246 | memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb)); |
cb4f4d3c | 1247 | |
e5c0d6ad RD |
1248 | trace_target_sequencer_start(cmd); |
1249 | ||
cb4f4d3c CH |
1250 | /* |
1251 | * Check for an existing UNIT ATTENTION condition | |
1252 | */ | |
de103c93 CH |
1253 | ret = target_scsi3_ua_check(cmd); |
1254 | if (ret) | |
1255 | return ret; | |
cb4f4d3c | 1256 | |
c87fbd56 | 1257 | ret = target_alua_state_check(cmd); |
de103c93 CH |
1258 | if (ret) |
1259 | return ret; | |
cb4f4d3c | 1260 | |
d977f437 | 1261 | ret = target_check_reservation(cmd); |
f85eda8d NB |
1262 | if (ret) { |
1263 | cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT; | |
d977f437 | 1264 | return ret; |
f85eda8d | 1265 | } |
cb4f4d3c | 1266 | |
0fd97ccf | 1267 | ret = dev->transport->parse_cdb(cmd); |
de103c93 CH |
1268 | if (ret) |
1269 | return ret; | |
1270 | ||
1271 | ret = transport_check_alloc_task_attr(cmd); | |
1272 | if (ret) | |
c66ac9db | 1273 | return ret; |
cb4f4d3c | 1274 | |
cb4f4d3c | 1275 | cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE; |
cb4f4d3c | 1276 | |
c66ac9db NB |
1277 | spin_lock(&cmd->se_lun->lun_sep_lock); |
1278 | if (cmd->se_lun->lun_sep) | |
1279 | cmd->se_lun->lun_sep->sep_stats.cmd_pdus++; | |
1280 | spin_unlock(&cmd->se_lun->lun_sep_lock); | |
1281 | return 0; | |
1282 | } | |
a12f41f8 | 1283 | EXPORT_SYMBOL(target_setup_cmd_from_cdb); |
c66ac9db | 1284 | |
695434e1 NB |
1285 | /* |
1286 | * Used by fabric module frontends to queue tasks directly. | |
1287 | * Many only be used from process context only | |
1288 | */ | |
1289 | int transport_handle_cdb_direct( | |
1290 | struct se_cmd *cmd) | |
1291 | { | |
de103c93 | 1292 | sense_reason_t ret; |
dd8ae59d | 1293 | |
695434e1 NB |
1294 | if (!cmd->se_lun) { |
1295 | dump_stack(); | |
6708bb27 | 1296 | pr_err("cmd->se_lun is NULL\n"); |
695434e1 NB |
1297 | return -EINVAL; |
1298 | } | |
1299 | if (in_interrupt()) { | |
1300 | dump_stack(); | |
6708bb27 | 1301 | pr_err("transport_generic_handle_cdb cannot be called" |
695434e1 NB |
1302 | " from interrupt context\n"); |
1303 | return -EINVAL; | |
1304 | } | |
dd8ae59d | 1305 | /* |
af877292 CH |
1306 | * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that |
1307 | * outstanding descriptors are handled correctly during shutdown via | |
1308 | * transport_wait_for_tasks() | |
dd8ae59d NB |
1309 | * |
1310 | * Also, we don't take cmd->t_state_lock here as we only expect | |
1311 | * this to be called for initial descriptor submission. | |
1312 | */ | |
1313 | cmd->t_state = TRANSPORT_NEW_CMD; | |
7d680f3b CH |
1314 | cmd->transport_state |= CMD_T_ACTIVE; |
1315 | ||
dd8ae59d NB |
1316 | /* |
1317 | * transport_generic_new_cmd() is already handling QUEUE_FULL, | |
1318 | * so follow TRANSPORT_NEW_CMD processing thread context usage | |
1319 | * and call transport_generic_request_failure() if necessary.. | |
1320 | */ | |
1321 | ret = transport_generic_new_cmd(cmd); | |
de103c93 CH |
1322 | if (ret) |
1323 | transport_generic_request_failure(cmd, ret); | |
dd8ae59d | 1324 | return 0; |
695434e1 NB |
1325 | } |
1326 | EXPORT_SYMBOL(transport_handle_cdb_direct); | |
1327 | ||
c5ff8d6b | 1328 | sense_reason_t |
de103c93 CH |
1329 | transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl, |
1330 | u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count) | |
1331 | { | |
1332 | if (!sgl || !sgl_count) | |
1333 | return 0; | |
1334 | ||
1335 | /* | |
1336 | * Reject SCSI data overflow with map_mem_to_cmd() as incoming | |
1337 | * scatterlists already have been set to follow what the fabric | |
1338 | * passes for the original expected data transfer length. | |
1339 | */ | |
1340 | if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) { | |
1341 | pr_warn("Rejecting SCSI DATA overflow for fabric using" | |
1342 | " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n"); | |
1343 | return TCM_INVALID_CDB_FIELD; | |
1344 | } | |
1345 | ||
1346 | cmd->t_data_sg = sgl; | |
1347 | cmd->t_data_nents = sgl_count; | |
1348 | ||
1349 | if (sgl_bidi && sgl_bidi_count) { | |
1350 | cmd->t_bidi_data_sg = sgl_bidi; | |
1351 | cmd->t_bidi_data_nents = sgl_bidi_count; | |
1352 | } | |
1353 | cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC; | |
1354 | return 0; | |
1355 | } | |
1356 | ||
a026757f NB |
1357 | /* |
1358 | * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized | |
1359 | * se_cmd + use pre-allocated SGL memory. | |
a6360785 NB |
1360 | * |
1361 | * @se_cmd: command descriptor to submit | |
1362 | * @se_sess: associated se_sess for endpoint | |
1363 | * @cdb: pointer to SCSI CDB | |
1364 | * @sense: pointer to SCSI sense buffer | |
1365 | * @unpacked_lun: unpacked LUN to reference for struct se_lun | |
1366 | * @data_length: fabric expected data transfer length | |
1367 | * @task_addr: SAM task attribute | |
1368 | * @data_dir: DMA data direction | |
1369 | * @flags: flags for command submission from target_sc_flags_tables | |
a026757f NB |
1370 | * @sgl: struct scatterlist memory for unidirectional mapping |
1371 | * @sgl_count: scatterlist count for unidirectional mapping | |
1372 | * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping | |
1373 | * @sgl_bidi_count: scatterlist count for bidirectional READ mapping | |
def2b339 NB |
1374 | * @sgl_prot: struct scatterlist memory protection information |
1375 | * @sgl_prot_count: scatterlist count for protection information | |
a6360785 | 1376 | * |
d6dfc868 RD |
1377 | * Returns non zero to signal active I/O shutdown failure. All other |
1378 | * setup exceptions will be returned as a SCSI CHECK_CONDITION response, | |
1379 | * but still return zero here. | |
1380 | * | |
a6360785 NB |
1381 | * This may only be called from process context, and also currently |
1382 | * assumes internal allocation of fabric payload buffer by target-core. | |
a026757f NB |
1383 | */ |
1384 | int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess, | |
a6360785 | 1385 | unsigned char *cdb, unsigned char *sense, u32 unpacked_lun, |
a026757f NB |
1386 | u32 data_length, int task_attr, int data_dir, int flags, |
1387 | struct scatterlist *sgl, u32 sgl_count, | |
def2b339 NB |
1388 | struct scatterlist *sgl_bidi, u32 sgl_bidi_count, |
1389 | struct scatterlist *sgl_prot, u32 sgl_prot_count) | |
a6360785 NB |
1390 | { |
1391 | struct se_portal_group *se_tpg; | |
de103c93 CH |
1392 | sense_reason_t rc; |
1393 | int ret; | |
a6360785 NB |
1394 | |
1395 | se_tpg = se_sess->se_tpg; | |
1396 | BUG_ON(!se_tpg); | |
1397 | BUG_ON(se_cmd->se_tfo || se_cmd->se_sess); | |
1398 | BUG_ON(in_interrupt()); | |
1399 | /* | |
1400 | * Initialize se_cmd for target operation. From this point | |
1401 | * exceptions are handled by sending exception status via | |
1402 | * target_core_fabric_ops->queue_status() callback | |
1403 | */ | |
1404 | transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, | |
1405 | data_length, data_dir, task_attr, sense); | |
b0d79946 SAS |
1406 | if (flags & TARGET_SCF_UNKNOWN_SIZE) |
1407 | se_cmd->unknown_data_length = 1; | |
a6360785 NB |
1408 | /* |
1409 | * Obtain struct se_cmd->cmd_kref reference and add new cmd to | |
1410 | * se_sess->sess_cmd_list. A second kref_get here is necessary | |
1411 | * for fabrics using TARGET_SCF_ACK_KREF that expect a second | |
1412 | * kref_put() to happen during fabric packet acknowledgement. | |
1413 | */ | |
de103c93 CH |
1414 | ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF)); |
1415 | if (ret) | |
1416 | return ret; | |
a6360785 NB |
1417 | /* |
1418 | * Signal bidirectional data payloads to target-core | |
1419 | */ | |
1420 | if (flags & TARGET_SCF_BIDI_OP) | |
1421 | se_cmd->se_cmd_flags |= SCF_BIDI; | |
1422 | /* | |
1423 | * Locate se_lun pointer and attach it to struct se_cmd | |
1424 | */ | |
de103c93 CH |
1425 | rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun); |
1426 | if (rc) { | |
1427 | transport_send_check_condition_and_sense(se_cmd, rc, 0); | |
735703ca | 1428 | target_put_sess_cmd(se_sess, se_cmd); |
d6dfc868 | 1429 | return 0; |
735703ca | 1430 | } |
b5b8e298 SG |
1431 | |
1432 | rc = target_setup_cmd_from_cdb(se_cmd, cdb); | |
1433 | if (rc != 0) { | |
1434 | transport_generic_request_failure(se_cmd, rc); | |
1435 | return 0; | |
1436 | } | |
1437 | ||
def2b339 NB |
1438 | /* |
1439 | * Save pointers for SGLs containing protection information, | |
1440 | * if present. | |
1441 | */ | |
1442 | if (sgl_prot_count) { | |
1443 | se_cmd->t_prot_sg = sgl_prot; | |
1444 | se_cmd->t_prot_nents = sgl_prot_count; | |
1445 | } | |
d6e0175c | 1446 | |
a026757f NB |
1447 | /* |
1448 | * When a non zero sgl_count has been passed perform SGL passthrough | |
1449 | * mapping for pre-allocated fabric memory instead of having target | |
1450 | * core perform an internal SGL allocation.. | |
1451 | */ | |
1452 | if (sgl_count != 0) { | |
1453 | BUG_ON(!sgl); | |
1454 | ||
944981c7 NB |
1455 | /* |
1456 | * A work-around for tcm_loop as some userspace code via | |
1457 | * scsi-generic do not memset their associated read buffers, | |
1458 | * so go ahead and do that here for type non-data CDBs. Also | |
1459 | * note that this is currently guaranteed to be a single SGL | |
1460 | * for this case by target core in target_setup_cmd_from_cdb() | |
1461 | * -> transport_generic_cmd_sequencer(). | |
1462 | */ | |
1463 | if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) && | |
1464 | se_cmd->data_direction == DMA_FROM_DEVICE) { | |
1465 | unsigned char *buf = NULL; | |
1466 | ||
1467 | if (sgl) | |
1468 | buf = kmap(sg_page(sgl)) + sgl->offset; | |
1469 | ||
1470 | if (buf) { | |
1471 | memset(buf, 0, sgl->length); | |
1472 | kunmap(sg_page(sgl)); | |
1473 | } | |
1474 | } | |
1475 | ||
a026757f NB |
1476 | rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count, |
1477 | sgl_bidi, sgl_bidi_count); | |
1478 | if (rc != 0) { | |
de103c93 | 1479 | transport_generic_request_failure(se_cmd, rc); |
a026757f NB |
1480 | return 0; |
1481 | } | |
1482 | } | |
def2b339 | 1483 | |
11e319ed AG |
1484 | /* |
1485 | * Check if we need to delay processing because of ALUA | |
1486 | * Active/NonOptimized primary access state.. | |
1487 | */ | |
1488 | core_alua_check_nonop_delay(se_cmd); | |
1489 | ||
a6360785 | 1490 | transport_handle_cdb_direct(se_cmd); |
d6dfc868 | 1491 | return 0; |
a6360785 | 1492 | } |
a026757f NB |
1493 | EXPORT_SYMBOL(target_submit_cmd_map_sgls); |
1494 | ||
1495 | /* | |
1496 | * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd | |
1497 | * | |
1498 | * @se_cmd: command descriptor to submit | |
1499 | * @se_sess: associated se_sess for endpoint | |
1500 | * @cdb: pointer to SCSI CDB | |
1501 | * @sense: pointer to SCSI sense buffer | |
1502 | * @unpacked_lun: unpacked LUN to reference for struct se_lun | |
1503 | * @data_length: fabric expected data transfer length | |
1504 | * @task_addr: SAM task attribute | |
1505 | * @data_dir: DMA data direction | |
1506 | * @flags: flags for command submission from target_sc_flags_tables | |
1507 | * | |
1508 | * Returns non zero to signal active I/O shutdown failure. All other | |
1509 | * setup exceptions will be returned as a SCSI CHECK_CONDITION response, | |
1510 | * but still return zero here. | |
1511 | * | |
1512 | * This may only be called from process context, and also currently | |
1513 | * assumes internal allocation of fabric payload buffer by target-core. | |
1514 | * | |
1515 | * It also assumes interal target core SGL memory allocation. | |
1516 | */ | |
1517 | int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess, | |
1518 | unsigned char *cdb, unsigned char *sense, u32 unpacked_lun, | |
1519 | u32 data_length, int task_attr, int data_dir, int flags) | |
1520 | { | |
1521 | return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense, | |
1522 | unpacked_lun, data_length, task_attr, data_dir, | |
def2b339 | 1523 | flags, NULL, 0, NULL, 0, NULL, 0); |
a026757f | 1524 | } |
a6360785 NB |
1525 | EXPORT_SYMBOL(target_submit_cmd); |
1526 | ||
9f0d05c2 NB |
1527 | static void target_complete_tmr_failure(struct work_struct *work) |
1528 | { | |
1529 | struct se_cmd *se_cmd = container_of(work, struct se_cmd, work); | |
1530 | ||
1531 | se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST; | |
1532 | se_cmd->se_tfo->queue_tm_rsp(se_cmd); | |
5a3b6fc0 RD |
1533 | |
1534 | transport_cmd_check_stop_to_fabric(se_cmd); | |
9f0d05c2 NB |
1535 | } |
1536 | ||
ea98d7f9 AG |
1537 | /** |
1538 | * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd | |
1539 | * for TMR CDBs | |
1540 | * | |
1541 | * @se_cmd: command descriptor to submit | |
1542 | * @se_sess: associated se_sess for endpoint | |
1543 | * @sense: pointer to SCSI sense buffer | |
1544 | * @unpacked_lun: unpacked LUN to reference for struct se_lun | |
1545 | * @fabric_context: fabric context for TMR req | |
1546 | * @tm_type: Type of TM request | |
c0974f89 NB |
1547 | * @gfp: gfp type for caller |
1548 | * @tag: referenced task tag for TMR_ABORT_TASK | |
c7042cae | 1549 | * @flags: submit cmd flags |
ea98d7f9 AG |
1550 | * |
1551 | * Callable from all contexts. | |
1552 | **/ | |
1553 | ||
c7042cae | 1554 | int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess, |
ea98d7f9 | 1555 | unsigned char *sense, u32 unpacked_lun, |
c0974f89 NB |
1556 | void *fabric_tmr_ptr, unsigned char tm_type, |
1557 | gfp_t gfp, unsigned int tag, int flags) | |
ea98d7f9 AG |
1558 | { |
1559 | struct se_portal_group *se_tpg; | |
1560 | int ret; | |
1561 | ||
1562 | se_tpg = se_sess->se_tpg; | |
1563 | BUG_ON(!se_tpg); | |
1564 | ||
1565 | transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, | |
68d81f40 | 1566 | 0, DMA_NONE, TCM_SIMPLE_TAG, sense); |
c7042cae NB |
1567 | /* |
1568 | * FIXME: Currently expect caller to handle se_cmd->se_tmr_req | |
1569 | * allocation failure. | |
1570 | */ | |
c0974f89 | 1571 | ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp); |
c7042cae NB |
1572 | if (ret < 0) |
1573 | return -ENOMEM; | |
ea98d7f9 | 1574 | |
c0974f89 NB |
1575 | if (tm_type == TMR_ABORT_TASK) |
1576 | se_cmd->se_tmr_req->ref_task_tag = tag; | |
1577 | ||
ea98d7f9 | 1578 | /* See target_submit_cmd for commentary */ |
bc187ea6 RD |
1579 | ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF)); |
1580 | if (ret) { | |
1581 | core_tmr_release_req(se_cmd->se_tmr_req); | |
1582 | return ret; | |
1583 | } | |
ea98d7f9 | 1584 | |
ea98d7f9 AG |
1585 | ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun); |
1586 | if (ret) { | |
9f0d05c2 NB |
1587 | /* |
1588 | * For callback during failure handling, push this work off | |
1589 | * to process context with TMR_LUN_DOES_NOT_EXIST status. | |
1590 | */ | |
1591 | INIT_WORK(&se_cmd->work, target_complete_tmr_failure); | |
1592 | schedule_work(&se_cmd->work); | |
c7042cae | 1593 | return 0; |
ea98d7f9 AG |
1594 | } |
1595 | transport_generic_handle_tmr(se_cmd); | |
c7042cae | 1596 | return 0; |
ea98d7f9 AG |
1597 | } |
1598 | EXPORT_SYMBOL(target_submit_tmr); | |
1599 | ||
cdbb70bb | 1600 | /* |
cf572a96 | 1601 | * If the cmd is active, request it to be stopped and sleep until it |
cdbb70bb CH |
1602 | * has completed. |
1603 | */ | |
cf572a96 | 1604 | bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags) |
cdbb70bb | 1605 | { |
cdbb70bb CH |
1606 | bool was_active = false; |
1607 | ||
cf572a96 CH |
1608 | if (cmd->transport_state & CMD_T_BUSY) { |
1609 | cmd->transport_state |= CMD_T_REQUEST_STOP; | |
cdbb70bb CH |
1610 | spin_unlock_irqrestore(&cmd->t_state_lock, *flags); |
1611 | ||
cf572a96 CH |
1612 | pr_debug("cmd %p waiting to complete\n", cmd); |
1613 | wait_for_completion(&cmd->task_stop_comp); | |
1614 | pr_debug("cmd %p stopped successfully\n", cmd); | |
cdbb70bb CH |
1615 | |
1616 | spin_lock_irqsave(&cmd->t_state_lock, *flags); | |
cf572a96 CH |
1617 | cmd->transport_state &= ~CMD_T_REQUEST_STOP; |
1618 | cmd->transport_state &= ~CMD_T_BUSY; | |
cdbb70bb CH |
1619 | was_active = true; |
1620 | } | |
1621 | ||
cdbb70bb CH |
1622 | return was_active; |
1623 | } | |
1624 | ||
c66ac9db NB |
1625 | /* |
1626 | * Handle SAM-esque emulation for generic transport request failures. | |
1627 | */ | |
de103c93 CH |
1628 | void transport_generic_request_failure(struct se_cmd *cmd, |
1629 | sense_reason_t sense_reason) | |
c66ac9db | 1630 | { |
07bde79a NB |
1631 | int ret = 0; |
1632 | ||
6708bb27 | 1633 | pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x" |
e3d6f909 | 1634 | " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd), |
a1d8b49a | 1635 | cmd->t_task_cdb[0]); |
de103c93 | 1636 | pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n", |
e3d6f909 | 1637 | cmd->se_tfo->get_cmd_state(cmd), |
de103c93 | 1638 | cmd->t_state, sense_reason); |
d43d6aea | 1639 | pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n", |
7d680f3b CH |
1640 | (cmd->transport_state & CMD_T_ACTIVE) != 0, |
1641 | (cmd->transport_state & CMD_T_STOP) != 0, | |
1642 | (cmd->transport_state & CMD_T_SENT) != 0); | |
c66ac9db | 1643 | |
c66ac9db NB |
1644 | /* |
1645 | * For SAM Task Attribute emulation for failed struct se_cmd | |
1646 | */ | |
019c4ca6 | 1647 | transport_complete_task_attr(cmd); |
cf6d1f09 NB |
1648 | /* |
1649 | * Handle special case for COMPARE_AND_WRITE failure, where the | |
1650 | * callback is expected to drop the per device ->caw_mutex. | |
1651 | */ | |
1652 | if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) && | |
1653 | cmd->transport_complete_callback) | |
1654 | cmd->transport_complete_callback(cmd); | |
c66ac9db | 1655 | |
de103c93 | 1656 | switch (sense_reason) { |
03e98c9e NB |
1657 | case TCM_NON_EXISTENT_LUN: |
1658 | case TCM_UNSUPPORTED_SCSI_OPCODE: | |
1659 | case TCM_INVALID_CDB_FIELD: | |
1660 | case TCM_INVALID_PARAMETER_LIST: | |
bb992e72 | 1661 | case TCM_PARAMETER_LIST_LENGTH_ERROR: |
03e98c9e NB |
1662 | case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE: |
1663 | case TCM_UNKNOWN_MODE_PAGE: | |
1664 | case TCM_WRITE_PROTECTED: | |
e2397c70 | 1665 | case TCM_ADDRESS_OUT_OF_RANGE: |
03e98c9e NB |
1666 | case TCM_CHECK_CONDITION_ABORT_CMD: |
1667 | case TCM_CHECK_CONDITION_UNIT_ATTENTION: | |
1668 | case TCM_CHECK_CONDITION_NOT_READY: | |
94387aa7 NB |
1669 | case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED: |
1670 | case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED: | |
1671 | case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED: | |
c66ac9db | 1672 | break; |
de103c93 CH |
1673 | case TCM_OUT_OF_RESOURCES: |
1674 | sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
1675 | break; | |
03e98c9e | 1676 | case TCM_RESERVATION_CONFLICT: |
c66ac9db NB |
1677 | /* |
1678 | * No SENSE Data payload for this case, set SCSI Status | |
1679 | * and queue the response to $FABRIC_MOD. | |
1680 | * | |
1681 | * Uses linux/include/scsi/scsi.h SAM status codes defs | |
1682 | */ | |
1683 | cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT; | |
1684 | /* | |
1685 | * For UA Interlock Code 11b, a RESERVATION CONFLICT will | |
1686 | * establish a UNIT ATTENTION with PREVIOUS RESERVATION | |
1687 | * CONFLICT STATUS. | |
1688 | * | |
1689 | * See spc4r17, section 7.4.6 Control Mode Page, Table 349 | |
1690 | */ | |
e3d6f909 | 1691 | if (cmd->se_sess && |
0fd97ccf | 1692 | cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2) |
e3d6f909 | 1693 | core_scsi3_ua_allocate(cmd->se_sess->se_node_acl, |
c66ac9db NB |
1694 | cmd->orig_fe_lun, 0x2C, |
1695 | ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS); | |
1696 | ||
e5c0d6ad RD |
1697 | trace_target_cmd_complete(cmd); |
1698 | ret = cmd->se_tfo-> queue_status(cmd); | |
f147abb4 | 1699 | if (ret == -EAGAIN || ret == -ENOMEM) |
07bde79a | 1700 | goto queue_full; |
c66ac9db | 1701 | goto check_stop; |
c66ac9db | 1702 | default: |
6708bb27 | 1703 | pr_err("Unknown transport error for CDB 0x%02x: %d\n", |
de103c93 CH |
1704 | cmd->t_task_cdb[0], sense_reason); |
1705 | sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; | |
c66ac9db NB |
1706 | break; |
1707 | } | |
f3146437 | 1708 | |
de103c93 | 1709 | ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0); |
03e98c9e NB |
1710 | if (ret == -EAGAIN || ret == -ENOMEM) |
1711 | goto queue_full; | |
07bde79a | 1712 | |
c66ac9db NB |
1713 | check_stop: |
1714 | transport_lun_remove_cmd(cmd); | |
6708bb27 | 1715 | if (!transport_cmd_check_stop_to_fabric(cmd)) |
c66ac9db | 1716 | ; |
07bde79a NB |
1717 | return; |
1718 | ||
1719 | queue_full: | |
e057f533 CH |
1720 | cmd->t_state = TRANSPORT_COMPLETE_QF_OK; |
1721 | transport_handle_queue_full(cmd, cmd->se_dev); | |
c66ac9db | 1722 | } |
2fbff127 | 1723 | EXPORT_SYMBOL(transport_generic_request_failure); |
c66ac9db | 1724 | |
76dde50e | 1725 | void __target_execute_cmd(struct se_cmd *cmd) |
c66ac9db | 1726 | { |
de103c93 | 1727 | sense_reason_t ret; |
5f41a31d | 1728 | |
de103c93 CH |
1729 | if (cmd->execute_cmd) { |
1730 | ret = cmd->execute_cmd(cmd); | |
1731 | if (ret) { | |
1732 | spin_lock_irq(&cmd->t_state_lock); | |
1733 | cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT); | |
1734 | spin_unlock_irq(&cmd->t_state_lock); | |
5f41a31d | 1735 | |
de103c93 CH |
1736 | transport_generic_request_failure(cmd, ret); |
1737 | } | |
5f41a31d CH |
1738 | } |
1739 | } | |
1740 | ||
aa58b531 NB |
1741 | static int target_write_prot_action(struct se_cmd *cmd) |
1742 | { | |
5132d1e6 | 1743 | u32 sectors; |
aa58b531 NB |
1744 | /* |
1745 | * Perform WRITE_INSERT of PI using software emulation when backend | |
1746 | * device has PI enabled, if the transport has not already generated | |
1747 | * PI using hardware WRITE_INSERT offload. | |
1748 | */ | |
1749 | switch (cmd->prot_op) { | |
1750 | case TARGET_PROT_DOUT_INSERT: | |
1751 | if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_INSERT)) | |
1752 | sbc_dif_generate(cmd); | |
1753 | break; | |
5132d1e6 NB |
1754 | case TARGET_PROT_DOUT_STRIP: |
1755 | if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_STRIP) | |
1756 | break; | |
1757 | ||
1758 | sectors = cmd->data_length >> ilog2(cmd->se_dev->dev_attrib.block_size); | |
1759 | cmd->pi_err = sbc_dif_verify_write(cmd, cmd->t_task_lba, | |
1760 | sectors, 0, NULL, 0); | |
1761 | if (unlikely(cmd->pi_err)) { | |
1762 | spin_lock_irq(&cmd->t_state_lock); | |
1763 | cmd->transport_state &= ~CMD_T_BUSY|CMD_T_SENT; | |
1764 | spin_unlock_irq(&cmd->t_state_lock); | |
1765 | transport_generic_request_failure(cmd, cmd->pi_err); | |
1766 | return -1; | |
1767 | } | |
1768 | break; | |
aa58b531 NB |
1769 | default: |
1770 | break; | |
1771 | } | |
1772 | ||
1773 | return 0; | |
1774 | } | |
1775 | ||
019c4ca6 | 1776 | static bool target_handle_task_attr(struct se_cmd *cmd) |
5f41a31d CH |
1777 | { |
1778 | struct se_device *dev = cmd->se_dev; | |
1779 | ||
019c4ca6 CH |
1780 | if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) |
1781 | return false; | |
5f41a31d | 1782 | |
c66ac9db | 1783 | /* |
25985edc | 1784 | * Check for the existence of HEAD_OF_QUEUE, and if true return 1 |
c66ac9db NB |
1785 | * to allow the passed struct se_cmd list of tasks to the front of the list. |
1786 | */ | |
5f41a31d | 1787 | switch (cmd->sam_task_attr) { |
68d81f40 | 1788 | case TCM_HEAD_TAG: |
5f41a31d CH |
1789 | pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, " |
1790 | "se_ordered_id: %u\n", | |
1791 | cmd->t_task_cdb[0], cmd->se_ordered_id); | |
019c4ca6 | 1792 | return false; |
68d81f40 | 1793 | case TCM_ORDERED_TAG: |
33940d09 | 1794 | atomic_inc_mb(&dev->dev_ordered_sync); |
c66ac9db | 1795 | |
5f41a31d CH |
1796 | pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, " |
1797 | " se_ordered_id: %u\n", | |
1798 | cmd->t_task_cdb[0], cmd->se_ordered_id); | |
1799 | ||
c66ac9db | 1800 | /* |
5f41a31d CH |
1801 | * Execute an ORDERED command if no other older commands |
1802 | * exist that need to be completed first. | |
c66ac9db | 1803 | */ |
5f41a31d | 1804 | if (!atomic_read(&dev->simple_cmds)) |
019c4ca6 | 1805 | return false; |
5f41a31d CH |
1806 | break; |
1807 | default: | |
c66ac9db NB |
1808 | /* |
1809 | * For SIMPLE and UNTAGGED Task Attribute commands | |
1810 | */ | |
33940d09 | 1811 | atomic_inc_mb(&dev->simple_cmds); |
5f41a31d | 1812 | break; |
c66ac9db | 1813 | } |
5f41a31d | 1814 | |
019c4ca6 CH |
1815 | if (atomic_read(&dev->dev_ordered_sync) == 0) |
1816 | return false; | |
c66ac9db | 1817 | |
019c4ca6 CH |
1818 | spin_lock(&dev->delayed_cmd_lock); |
1819 | list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list); | |
1820 | spin_unlock(&dev->delayed_cmd_lock); | |
1821 | ||
1822 | pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to" | |
1823 | " delayed CMD list, se_ordered_id: %u\n", | |
1824 | cmd->t_task_cdb[0], cmd->sam_task_attr, | |
1825 | cmd->se_ordered_id); | |
1826 | return true; | |
1827 | } | |
1828 | ||
1829 | void target_execute_cmd(struct se_cmd *cmd) | |
1830 | { | |
1831 | /* | |
1832 | * If the received CDB has aleady been aborted stop processing it here. | |
1833 | */ | |
4a9a6c8d | 1834 | if (transport_check_aborted_status(cmd, 1)) |
5f41a31d | 1835 | return; |
c66ac9db | 1836 | |
019c4ca6 CH |
1837 | /* |
1838 | * Determine if frontend context caller is requesting the stopping of | |
1839 | * this command for frontend exceptions. | |
1840 | */ | |
4a9a6c8d | 1841 | spin_lock_irq(&cmd->t_state_lock); |
019c4ca6 CH |
1842 | if (cmd->transport_state & CMD_T_STOP) { |
1843 | pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n", | |
1844 | __func__, __LINE__, | |
1845 | cmd->se_tfo->get_task_tag(cmd)); | |
1846 | ||
1847 | spin_unlock_irq(&cmd->t_state_lock); | |
a95d6511 | 1848 | complete_all(&cmd->t_transport_stop_comp); |
019c4ca6 CH |
1849 | return; |
1850 | } | |
1851 | ||
1852 | cmd->t_state = TRANSPORT_PROCESSING; | |
1a398b97 | 1853 | cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT; |
019c4ca6 | 1854 | spin_unlock_irq(&cmd->t_state_lock); |
aa58b531 NB |
1855 | |
1856 | if (target_write_prot_action(cmd)) | |
1857 | return; | |
019c4ca6 | 1858 | |
1a398b97 NB |
1859 | if (target_handle_task_attr(cmd)) { |
1860 | spin_lock_irq(&cmd->t_state_lock); | |
1861 | cmd->transport_state &= ~CMD_T_BUSY|CMD_T_SENT; | |
1862 | spin_unlock_irq(&cmd->t_state_lock); | |
1863 | return; | |
1864 | } | |
1865 | ||
1866 | __target_execute_cmd(cmd); | |
c66ac9db | 1867 | } |
70baf0ab | 1868 | EXPORT_SYMBOL(target_execute_cmd); |
c66ac9db | 1869 | |
5f41a31d CH |
1870 | /* |
1871 | * Process all commands up to the last received ORDERED task attribute which | |
1872 | * requires another blocking boundary | |
1873 | */ | |
1874 | static void target_restart_delayed_cmds(struct se_device *dev) | |
1875 | { | |
1876 | for (;;) { | |
1877 | struct se_cmd *cmd; | |
1878 | ||
1879 | spin_lock(&dev->delayed_cmd_lock); | |
1880 | if (list_empty(&dev->delayed_cmd_list)) { | |
1881 | spin_unlock(&dev->delayed_cmd_lock); | |
1882 | break; | |
1883 | } | |
1884 | ||
1885 | cmd = list_entry(dev->delayed_cmd_list.next, | |
1886 | struct se_cmd, se_delayed_node); | |
1887 | list_del(&cmd->se_delayed_node); | |
1888 | spin_unlock(&dev->delayed_cmd_lock); | |
1889 | ||
1890 | __target_execute_cmd(cmd); | |
1891 | ||
68d81f40 | 1892 | if (cmd->sam_task_attr == TCM_ORDERED_TAG) |
5f41a31d CH |
1893 | break; |
1894 | } | |
1895 | } | |
1896 | ||
c66ac9db | 1897 | /* |
35e0e757 | 1898 | * Called from I/O completion to determine which dormant/delayed |
c66ac9db NB |
1899 | * and ordered cmds need to have their tasks added to the execution queue. |
1900 | */ | |
1901 | static void transport_complete_task_attr(struct se_cmd *cmd) | |
1902 | { | |
5951146d | 1903 | struct se_device *dev = cmd->se_dev; |
c66ac9db | 1904 | |
019c4ca6 CH |
1905 | if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) |
1906 | return; | |
1907 | ||
68d81f40 | 1908 | if (cmd->sam_task_attr == TCM_SIMPLE_TAG) { |
33940d09 | 1909 | atomic_dec_mb(&dev->simple_cmds); |
c66ac9db | 1910 | dev->dev_cur_ordered_id++; |
6708bb27 | 1911 | pr_debug("Incremented dev->dev_cur_ordered_id: %u for" |
c66ac9db NB |
1912 | " SIMPLE: %u\n", dev->dev_cur_ordered_id, |
1913 | cmd->se_ordered_id); | |
68d81f40 | 1914 | } else if (cmd->sam_task_attr == TCM_HEAD_TAG) { |
c66ac9db | 1915 | dev->dev_cur_ordered_id++; |
6708bb27 | 1916 | pr_debug("Incremented dev_cur_ordered_id: %u for" |
c66ac9db NB |
1917 | " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id, |
1918 | cmd->se_ordered_id); | |
68d81f40 | 1919 | } else if (cmd->sam_task_attr == TCM_ORDERED_TAG) { |
33940d09 | 1920 | atomic_dec_mb(&dev->dev_ordered_sync); |
c66ac9db NB |
1921 | |
1922 | dev->dev_cur_ordered_id++; | |
6708bb27 | 1923 | pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:" |
c66ac9db NB |
1924 | " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id); |
1925 | } | |
c66ac9db | 1926 | |
5f41a31d | 1927 | target_restart_delayed_cmds(dev); |
c66ac9db NB |
1928 | } |
1929 | ||
e057f533 | 1930 | static void transport_complete_qf(struct se_cmd *cmd) |
07bde79a NB |
1931 | { |
1932 | int ret = 0; | |
1933 | ||
019c4ca6 | 1934 | transport_complete_task_attr(cmd); |
e057f533 CH |
1935 | |
1936 | if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) { | |
e5c0d6ad | 1937 | trace_target_cmd_complete(cmd); |
e057f533 | 1938 | ret = cmd->se_tfo->queue_status(cmd); |
082f58ac | 1939 | goto out; |
e057f533 | 1940 | } |
07bde79a NB |
1941 | |
1942 | switch (cmd->data_direction) { | |
1943 | case DMA_FROM_DEVICE: | |
e5c0d6ad | 1944 | trace_target_cmd_complete(cmd); |
07bde79a NB |
1945 | ret = cmd->se_tfo->queue_data_in(cmd); |
1946 | break; | |
1947 | case DMA_TO_DEVICE: | |
64577407 | 1948 | if (cmd->se_cmd_flags & SCF_BIDI) { |
07bde79a NB |
1949 | ret = cmd->se_tfo->queue_data_in(cmd); |
1950 | if (ret < 0) | |
e057f533 | 1951 | break; |
07bde79a NB |
1952 | } |
1953 | /* Fall through for DMA_TO_DEVICE */ | |
1954 | case DMA_NONE: | |
e5c0d6ad | 1955 | trace_target_cmd_complete(cmd); |
07bde79a NB |
1956 | ret = cmd->se_tfo->queue_status(cmd); |
1957 | break; | |
1958 | default: | |
1959 | break; | |
1960 | } | |
1961 | ||
e057f533 CH |
1962 | out: |
1963 | if (ret < 0) { | |
1964 | transport_handle_queue_full(cmd, cmd->se_dev); | |
1965 | return; | |
1966 | } | |
1967 | transport_lun_remove_cmd(cmd); | |
1968 | transport_cmd_check_stop_to_fabric(cmd); | |
07bde79a NB |
1969 | } |
1970 | ||
1971 | static void transport_handle_queue_full( | |
1972 | struct se_cmd *cmd, | |
e057f533 | 1973 | struct se_device *dev) |
07bde79a NB |
1974 | { |
1975 | spin_lock_irq(&dev->qf_cmd_lock); | |
07bde79a | 1976 | list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list); |
33940d09 | 1977 | atomic_inc_mb(&dev->dev_qf_count); |
07bde79a NB |
1978 | spin_unlock_irq(&cmd->se_dev->qf_cmd_lock); |
1979 | ||
1980 | schedule_work(&cmd->se_dev->qf_work_queue); | |
1981 | } | |
1982 | ||
fdeab852 | 1983 | static bool target_read_prot_action(struct se_cmd *cmd) |
bc005869 NB |
1984 | { |
1985 | sense_reason_t rc; | |
1986 | ||
fdeab852 NB |
1987 | switch (cmd->prot_op) { |
1988 | case TARGET_PROT_DIN_STRIP: | |
1989 | if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_STRIP)) { | |
1990 | rc = sbc_dif_read_strip(cmd); | |
1991 | if (rc) { | |
1992 | cmd->pi_err = rc; | |
1993 | return true; | |
1994 | } | |
bc005869 | 1995 | } |
fdeab852 NB |
1996 | break; |
1997 | default: | |
1998 | break; | |
bc005869 NB |
1999 | } |
2000 | ||
2001 | return false; | |
2002 | } | |
2003 | ||
35e0e757 | 2004 | static void target_complete_ok_work(struct work_struct *work) |
c66ac9db | 2005 | { |
35e0e757 | 2006 | struct se_cmd *cmd = container_of(work, struct se_cmd, work); |
27a27099 | 2007 | int ret; |
35e0e757 | 2008 | |
c66ac9db NB |
2009 | /* |
2010 | * Check if we need to move delayed/dormant tasks from cmds on the | |
2011 | * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task | |
2012 | * Attribute. | |
2013 | */ | |
019c4ca6 CH |
2014 | transport_complete_task_attr(cmd); |
2015 | ||
07bde79a NB |
2016 | /* |
2017 | * Check to schedule QUEUE_FULL work, or execute an existing | |
2018 | * cmd->transport_qf_callback() | |
2019 | */ | |
2020 | if (atomic_read(&cmd->se_dev->dev_qf_count) != 0) | |
2021 | schedule_work(&cmd->se_dev->qf_work_queue); | |
2022 | ||
c66ac9db | 2023 | /* |
d5829eac | 2024 | * Check if we need to send a sense buffer from |
c66ac9db NB |
2025 | * the struct se_cmd in question. |
2026 | */ | |
2027 | if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) { | |
27a27099 | 2028 | WARN_ON(!cmd->scsi_status); |
27a27099 PB |
2029 | ret = transport_send_check_condition_and_sense( |
2030 | cmd, 0, 1); | |
2031 | if (ret == -EAGAIN || ret == -ENOMEM) | |
2032 | goto queue_full; | |
2033 | ||
2034 | transport_lun_remove_cmd(cmd); | |
2035 | transport_cmd_check_stop_to_fabric(cmd); | |
2036 | return; | |
c66ac9db NB |
2037 | } |
2038 | /* | |
25985edc | 2039 | * Check for a callback, used by amongst other things |
a6b0133c | 2040 | * XDWRITE_READ_10 and COMPARE_AND_WRITE emulation. |
c66ac9db | 2041 | */ |
a6b0133c NB |
2042 | if (cmd->transport_complete_callback) { |
2043 | sense_reason_t rc; | |
2044 | ||
2045 | rc = cmd->transport_complete_callback(cmd); | |
a2890087 | 2046 | if (!rc && !(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE_POST)) { |
a6b0133c | 2047 | return; |
a2890087 NB |
2048 | } else if (rc) { |
2049 | ret = transport_send_check_condition_and_sense(cmd, | |
2050 | rc, 0); | |
2051 | if (ret == -EAGAIN || ret == -ENOMEM) | |
2052 | goto queue_full; | |
a6b0133c | 2053 | |
a2890087 NB |
2054 | transport_lun_remove_cmd(cmd); |
2055 | transport_cmd_check_stop_to_fabric(cmd); | |
2056 | return; | |
2057 | } | |
a6b0133c | 2058 | } |
c66ac9db NB |
2059 | |
2060 | switch (cmd->data_direction) { | |
2061 | case DMA_FROM_DEVICE: | |
2062 | spin_lock(&cmd->se_lun->lun_sep_lock); | |
e3d6f909 AG |
2063 | if (cmd->se_lun->lun_sep) { |
2064 | cmd->se_lun->lun_sep->sep_stats.tx_data_octets += | |
c66ac9db NB |
2065 | cmd->data_length; |
2066 | } | |
2067 | spin_unlock(&cmd->se_lun->lun_sep_lock); | |
bc005869 NB |
2068 | /* |
2069 | * Perform READ_STRIP of PI using software emulation when | |
2070 | * backend had PI enabled, if the transport will not be | |
2071 | * performing hardware READ_STRIP offload. | |
2072 | */ | |
fdeab852 | 2073 | if (target_read_prot_action(cmd)) { |
bc005869 NB |
2074 | ret = transport_send_check_condition_and_sense(cmd, |
2075 | cmd->pi_err, 0); | |
2076 | if (ret == -EAGAIN || ret == -ENOMEM) | |
2077 | goto queue_full; | |
2078 | ||
2079 | transport_lun_remove_cmd(cmd); | |
2080 | transport_cmd_check_stop_to_fabric(cmd); | |
2081 | return; | |
2082 | } | |
c66ac9db | 2083 | |
e5c0d6ad | 2084 | trace_target_cmd_complete(cmd); |
07bde79a | 2085 | ret = cmd->se_tfo->queue_data_in(cmd); |
f147abb4 | 2086 | if (ret == -EAGAIN || ret == -ENOMEM) |
07bde79a | 2087 | goto queue_full; |
c66ac9db NB |
2088 | break; |
2089 | case DMA_TO_DEVICE: | |
2090 | spin_lock(&cmd->se_lun->lun_sep_lock); | |
e3d6f909 AG |
2091 | if (cmd->se_lun->lun_sep) { |
2092 | cmd->se_lun->lun_sep->sep_stats.rx_data_octets += | |
c66ac9db NB |
2093 | cmd->data_length; |
2094 | } | |
2095 | spin_unlock(&cmd->se_lun->lun_sep_lock); | |
2096 | /* | |
2097 | * Check if we need to send READ payload for BIDI-COMMAND | |
2098 | */ | |
64577407 | 2099 | if (cmd->se_cmd_flags & SCF_BIDI) { |
c66ac9db | 2100 | spin_lock(&cmd->se_lun->lun_sep_lock); |
e3d6f909 AG |
2101 | if (cmd->se_lun->lun_sep) { |
2102 | cmd->se_lun->lun_sep->sep_stats.tx_data_octets += | |
c66ac9db NB |
2103 | cmd->data_length; |
2104 | } | |
2105 | spin_unlock(&cmd->se_lun->lun_sep_lock); | |
07bde79a | 2106 | ret = cmd->se_tfo->queue_data_in(cmd); |
f147abb4 | 2107 | if (ret == -EAGAIN || ret == -ENOMEM) |
07bde79a | 2108 | goto queue_full; |
c66ac9db NB |
2109 | break; |
2110 | } | |
2111 | /* Fall through for DMA_TO_DEVICE */ | |
2112 | case DMA_NONE: | |
e5c0d6ad | 2113 | trace_target_cmd_complete(cmd); |
07bde79a | 2114 | ret = cmd->se_tfo->queue_status(cmd); |
f147abb4 | 2115 | if (ret == -EAGAIN || ret == -ENOMEM) |
07bde79a | 2116 | goto queue_full; |
c66ac9db NB |
2117 | break; |
2118 | default: | |
2119 | break; | |
2120 | } | |
2121 | ||
2122 | transport_lun_remove_cmd(cmd); | |
2123 | transport_cmd_check_stop_to_fabric(cmd); | |
07bde79a NB |
2124 | return; |
2125 | ||
2126 | queue_full: | |
6708bb27 | 2127 | pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p," |
07bde79a | 2128 | " data_direction: %d\n", cmd, cmd->data_direction); |
e057f533 CH |
2129 | cmd->t_state = TRANSPORT_COMPLETE_QF_OK; |
2130 | transport_handle_queue_full(cmd, cmd->se_dev); | |
c66ac9db NB |
2131 | } |
2132 | ||
6708bb27 | 2133 | static inline void transport_free_sgl(struct scatterlist *sgl, int nents) |
c66ac9db | 2134 | { |
ec98f782 | 2135 | struct scatterlist *sg; |
ec98f782 | 2136 | int count; |
c66ac9db | 2137 | |
6708bb27 AG |
2138 | for_each_sg(sgl, sg, nents, count) |
2139 | __free_page(sg_page(sg)); | |
c66ac9db | 2140 | |
6708bb27 AG |
2141 | kfree(sgl); |
2142 | } | |
c66ac9db | 2143 | |
47e459e6 NB |
2144 | static inline void transport_reset_sgl_orig(struct se_cmd *cmd) |
2145 | { | |
2146 | /* | |
2147 | * Check for saved t_data_sg that may be used for COMPARE_AND_WRITE | |
2148 | * emulation, and free + reset pointers if necessary.. | |
2149 | */ | |
2150 | if (!cmd->t_data_sg_orig) | |
2151 | return; | |
2152 | ||
2153 | kfree(cmd->t_data_sg); | |
2154 | cmd->t_data_sg = cmd->t_data_sg_orig; | |
2155 | cmd->t_data_sg_orig = NULL; | |
2156 | cmd->t_data_nents = cmd->t_data_nents_orig; | |
2157 | cmd->t_data_nents_orig = 0; | |
2158 | } | |
2159 | ||
6708bb27 AG |
2160 | static inline void transport_free_pages(struct se_cmd *cmd) |
2161 | { | |
47e459e6 NB |
2162 | if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) { |
2163 | transport_reset_sgl_orig(cmd); | |
6708bb27 | 2164 | return; |
47e459e6 NB |
2165 | } |
2166 | transport_reset_sgl_orig(cmd); | |
6708bb27 AG |
2167 | |
2168 | transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents); | |
ec98f782 AG |
2169 | cmd->t_data_sg = NULL; |
2170 | cmd->t_data_nents = 0; | |
c66ac9db | 2171 | |
6708bb27 | 2172 | transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents); |
ec98f782 AG |
2173 | cmd->t_bidi_data_sg = NULL; |
2174 | cmd->t_bidi_data_nents = 0; | |
acb2bde3 SG |
2175 | |
2176 | transport_free_sgl(cmd->t_prot_sg, cmd->t_prot_nents); | |
2177 | cmd->t_prot_sg = NULL; | |
2178 | cmd->t_prot_nents = 0; | |
c66ac9db NB |
2179 | } |
2180 | ||
e26d99ae CH |
2181 | /** |
2182 | * transport_release_cmd - free a command | |
2183 | * @cmd: command to free | |
2184 | * | |
2185 | * This routine unconditionally frees a command, and reference counting | |
2186 | * or list removal must be done in the caller. | |
2187 | */ | |
d5ddad41 | 2188 | static int transport_release_cmd(struct se_cmd *cmd) |
e26d99ae CH |
2189 | { |
2190 | BUG_ON(!cmd->se_tfo); | |
2191 | ||
c8e31f26 | 2192 | if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB) |
e26d99ae CH |
2193 | core_tmr_release_req(cmd->se_tmr_req); |
2194 | if (cmd->t_task_cdb != cmd->__t_task_cdb) | |
2195 | kfree(cmd->t_task_cdb); | |
2196 | /* | |
7481deb4 NB |
2197 | * If this cmd has been setup with target_get_sess_cmd(), drop |
2198 | * the kref and call ->release_cmd() in kref callback. | |
e26d99ae | 2199 | */ |
ca24976a | 2200 | return target_put_sess_cmd(cmd->se_sess, cmd); |
e26d99ae CH |
2201 | } |
2202 | ||
d3df7825 CH |
2203 | /** |
2204 | * transport_put_cmd - release a reference to a command | |
2205 | * @cmd: command to release | |
2206 | * | |
2207 | * This routine releases our reference to the command and frees it if possible. | |
2208 | */ | |
d5ddad41 | 2209 | static int transport_put_cmd(struct se_cmd *cmd) |
c66ac9db | 2210 | { |
c66ac9db | 2211 | transport_free_pages(cmd); |
d5ddad41 | 2212 | return transport_release_cmd(cmd); |
c66ac9db | 2213 | } |
c66ac9db | 2214 | |
4949314c | 2215 | void *transport_kmap_data_sg(struct se_cmd *cmd) |
05d1c7c0 | 2216 | { |
ec98f782 | 2217 | struct scatterlist *sg = cmd->t_data_sg; |
4949314c AG |
2218 | struct page **pages; |
2219 | int i; | |
05d1c7c0 AG |
2220 | |
2221 | /* | |
ec98f782 AG |
2222 | * We need to take into account a possible offset here for fabrics like |
2223 | * tcm_loop who may be using a contig buffer from the SCSI midlayer for | |
2224 | * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd() | |
05d1c7c0 | 2225 | */ |
4949314c AG |
2226 | if (!cmd->t_data_nents) |
2227 | return NULL; | |
3717ef0c PB |
2228 | |
2229 | BUG_ON(!sg); | |
2230 | if (cmd->t_data_nents == 1) | |
4949314c AG |
2231 | return kmap(sg_page(sg)) + sg->offset; |
2232 | ||
2233 | /* >1 page. use vmap */ | |
2234 | pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL); | |
de103c93 | 2235 | if (!pages) |
4949314c AG |
2236 | return NULL; |
2237 | ||
2238 | /* convert sg[] to pages[] */ | |
2239 | for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) { | |
2240 | pages[i] = sg_page(sg); | |
2241 | } | |
2242 | ||
2243 | cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL); | |
2244 | kfree(pages); | |
de103c93 | 2245 | if (!cmd->t_data_vmap) |
4949314c AG |
2246 | return NULL; |
2247 | ||
2248 | return cmd->t_data_vmap + cmd->t_data_sg[0].offset; | |
05d1c7c0 | 2249 | } |
4949314c | 2250 | EXPORT_SYMBOL(transport_kmap_data_sg); |
05d1c7c0 | 2251 | |
4949314c | 2252 | void transport_kunmap_data_sg(struct se_cmd *cmd) |
05d1c7c0 | 2253 | { |
a1edf9cf | 2254 | if (!cmd->t_data_nents) { |
4949314c | 2255 | return; |
a1edf9cf | 2256 | } else if (cmd->t_data_nents == 1) { |
4949314c | 2257 | kunmap(sg_page(cmd->t_data_sg)); |
a1edf9cf AG |
2258 | return; |
2259 | } | |
4949314c AG |
2260 | |
2261 | vunmap(cmd->t_data_vmap); | |
2262 | cmd->t_data_vmap = NULL; | |
05d1c7c0 | 2263 | } |
4949314c | 2264 | EXPORT_SYMBOL(transport_kunmap_data_sg); |
05d1c7c0 | 2265 | |
c5ff8d6b | 2266 | int |
20093994 NB |
2267 | target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, u32 length, |
2268 | bool zero_page) | |
c66ac9db | 2269 | { |
20093994 | 2270 | struct scatterlist *sg; |
ec98f782 | 2271 | struct page *page; |
20093994 NB |
2272 | gfp_t zero_flag = (zero_page) ? __GFP_ZERO : 0; |
2273 | unsigned int nent; | |
ec98f782 | 2274 | int i = 0; |
c66ac9db | 2275 | |
20093994 NB |
2276 | nent = DIV_ROUND_UP(length, PAGE_SIZE); |
2277 | sg = kmalloc(sizeof(struct scatterlist) * nent, GFP_KERNEL); | |
2278 | if (!sg) | |
ec98f782 | 2279 | return -ENOMEM; |
c66ac9db | 2280 | |
20093994 | 2281 | sg_init_table(sg, nent); |
9db9da33 | 2282 | |
ec98f782 AG |
2283 | while (length) { |
2284 | u32 page_len = min_t(u32, length, PAGE_SIZE); | |
9db9da33 | 2285 | page = alloc_page(GFP_KERNEL | zero_flag); |
ec98f782 AG |
2286 | if (!page) |
2287 | goto out; | |
c66ac9db | 2288 | |
20093994 | 2289 | sg_set_page(&sg[i], page, page_len, 0); |
ec98f782 AG |
2290 | length -= page_len; |
2291 | i++; | |
c66ac9db | 2292 | } |
20093994 NB |
2293 | *sgl = sg; |
2294 | *nents = nent; | |
c66ac9db | 2295 | return 0; |
c66ac9db | 2296 | |
ec98f782 | 2297 | out: |
d0e27c88 | 2298 | while (i > 0) { |
ec98f782 | 2299 | i--; |
20093994 | 2300 | __free_page(sg_page(&sg[i])); |
c66ac9db | 2301 | } |
20093994 | 2302 | kfree(sg); |
ec98f782 | 2303 | return -ENOMEM; |
c66ac9db NB |
2304 | } |
2305 | ||
da0f7619 | 2306 | /* |
b16a35b0 AG |
2307 | * Allocate any required resources to execute the command. For writes we |
2308 | * might not have the payload yet, so notify the fabric via a call to | |
2309 | * ->write_pending instead. Otherwise place it on the execution queue. | |
c66ac9db | 2310 | */ |
de103c93 CH |
2311 | sense_reason_t |
2312 | transport_generic_new_cmd(struct se_cmd *cmd) | |
c66ac9db | 2313 | { |
c66ac9db NB |
2314 | int ret = 0; |
2315 | ||
2316 | /* | |
2317 | * Determine is the TCM fabric module has already allocated physical | |
2318 | * memory, and is directly calling transport_generic_map_mem_to_cmd() | |
ec98f782 | 2319 | * beforehand. |
c66ac9db | 2320 | */ |
ec98f782 AG |
2321 | if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) && |
2322 | cmd->data_length) { | |
20093994 NB |
2323 | bool zero_flag = !(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB); |
2324 | ||
8cefe07b NB |
2325 | if ((cmd->se_cmd_flags & SCF_BIDI) || |
2326 | (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) { | |
2327 | u32 bidi_length; | |
2328 | ||
2329 | if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) | |
2330 | bidi_length = cmd->t_task_nolb * | |
2331 | cmd->se_dev->dev_attrib.block_size; | |
2332 | else | |
2333 | bidi_length = cmd->data_length; | |
2334 | ||
2335 | ret = target_alloc_sgl(&cmd->t_bidi_data_sg, | |
2336 | &cmd->t_bidi_data_nents, | |
2337 | bidi_length, zero_flag); | |
2338 | if (ret < 0) | |
2339 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
2340 | } | |
2341 | ||
19f9361a | 2342 | if (cmd->prot_op != TARGET_PROT_NORMAL) { |
acb2bde3 SG |
2343 | ret = target_alloc_sgl(&cmd->t_prot_sg, |
2344 | &cmd->t_prot_nents, | |
2345 | cmd->prot_length, true); | |
2346 | if (ret < 0) | |
2347 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
2348 | } | |
2349 | ||
20093994 NB |
2350 | ret = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents, |
2351 | cmd->data_length, zero_flag); | |
c66ac9db | 2352 | if (ret < 0) |
de103c93 | 2353 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
c66ac9db | 2354 | } |
c66ac9db | 2355 | /* |
c3196f0c CH |
2356 | * If this command is not a write we can execute it right here, |
2357 | * for write buffers we need to notify the fabric driver first | |
2358 | * and let it call back once the write buffers are ready. | |
c66ac9db | 2359 | */ |
5f41a31d | 2360 | target_add_to_state_list(cmd); |
885e7b0e | 2361 | if (cmd->data_direction != DMA_TO_DEVICE || cmd->data_length == 0) { |
c3196f0c CH |
2362 | target_execute_cmd(cmd); |
2363 | return 0; | |
2364 | } | |
862e6389 | 2365 | transport_cmd_check_stop(cmd, false, true); |
c3196f0c CH |
2366 | |
2367 | ret = cmd->se_tfo->write_pending(cmd); | |
2368 | if (ret == -EAGAIN || ret == -ENOMEM) | |
2369 | goto queue_full; | |
2370 | ||
de103c93 CH |
2371 | /* fabric drivers should only return -EAGAIN or -ENOMEM as error */ |
2372 | WARN_ON(ret); | |
2373 | ||
b69c1fcf | 2374 | return (!ret) ? 0 : TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
da0f7619 | 2375 | |
c3196f0c CH |
2376 | queue_full: |
2377 | pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd); | |
2378 | cmd->t_state = TRANSPORT_COMPLETE_QF_WP; | |
2379 | transport_handle_queue_full(cmd, cmd->se_dev); | |
2380 | return 0; | |
c66ac9db | 2381 | } |
a1d8b49a | 2382 | EXPORT_SYMBOL(transport_generic_new_cmd); |
c66ac9db | 2383 | |
e057f533 | 2384 | static void transport_write_pending_qf(struct se_cmd *cmd) |
07bde79a | 2385 | { |
f147abb4 NB |
2386 | int ret; |
2387 | ||
2388 | ret = cmd->se_tfo->write_pending(cmd); | |
2389 | if (ret == -EAGAIN || ret == -ENOMEM) { | |
e057f533 CH |
2390 | pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", |
2391 | cmd); | |
2392 | transport_handle_queue_full(cmd, cmd->se_dev); | |
2393 | } | |
07bde79a NB |
2394 | } |
2395 | ||
d5ddad41 | 2396 | int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks) |
c66ac9db | 2397 | { |
c130480b | 2398 | unsigned long flags; |
d5ddad41 NB |
2399 | int ret = 0; |
2400 | ||
d14921d6 | 2401 | if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) { |
c8e31f26 | 2402 | if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) |
d14921d6 NB |
2403 | transport_wait_for_tasks(cmd); |
2404 | ||
d5ddad41 | 2405 | ret = transport_release_cmd(cmd); |
d14921d6 NB |
2406 | } else { |
2407 | if (wait_for_tasks) | |
2408 | transport_wait_for_tasks(cmd); | |
c130480b NB |
2409 | /* |
2410 | * Handle WRITE failure case where transport_generic_new_cmd() | |
2411 | * has already added se_cmd to state_list, but fabric has | |
2412 | * failed command before I/O submission. | |
2413 | */ | |
2414 | if (cmd->state_active) { | |
2415 | spin_lock_irqsave(&cmd->t_state_lock, flags); | |
2416 | target_remove_from_state_list(cmd); | |
2417 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
2418 | } | |
d14921d6 | 2419 | |
82f1c8a4 | 2420 | if (cmd->se_lun) |
c66ac9db | 2421 | transport_lun_remove_cmd(cmd); |
c66ac9db | 2422 | |
d5ddad41 | 2423 | ret = transport_put_cmd(cmd); |
c66ac9db | 2424 | } |
d5ddad41 | 2425 | return ret; |
c66ac9db NB |
2426 | } |
2427 | EXPORT_SYMBOL(transport_generic_free_cmd); | |
2428 | ||
a17f091d NB |
2429 | /* target_get_sess_cmd - Add command to active ->sess_cmd_list |
2430 | * @se_sess: session to reference | |
2431 | * @se_cmd: command descriptor to add | |
a6360785 | 2432 | * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd() |
a17f091d | 2433 | */ |
20361e69 | 2434 | int target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd, |
bc187ea6 | 2435 | bool ack_kref) |
a17f091d NB |
2436 | { |
2437 | unsigned long flags; | |
bc187ea6 | 2438 | int ret = 0; |
a17f091d | 2439 | |
a6360785 NB |
2440 | /* |
2441 | * Add a second kref if the fabric caller is expecting to handle | |
2442 | * fabric acknowledgement that requires two target_put_sess_cmd() | |
2443 | * invocations before se_cmd descriptor release. | |
2444 | */ | |
0bcc297e | 2445 | if (ack_kref) { |
a6360785 | 2446 | kref_get(&se_cmd->cmd_kref); |
86715569 NB |
2447 | se_cmd->se_cmd_flags |= SCF_ACK_KREF; |
2448 | } | |
7481deb4 | 2449 | |
a17f091d | 2450 | spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); |
bc187ea6 RD |
2451 | if (se_sess->sess_tearing_down) { |
2452 | ret = -ESHUTDOWN; | |
2453 | goto out; | |
2454 | } | |
a17f091d | 2455 | list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list); |
bc187ea6 | 2456 | out: |
a17f091d | 2457 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); |
bc187ea6 | 2458 | return ret; |
a17f091d | 2459 | } |
20361e69 | 2460 | EXPORT_SYMBOL(target_get_sess_cmd); |
a17f091d | 2461 | |
7481deb4 | 2462 | static void target_release_cmd_kref(struct kref *kref) |
077aa3b2 | 2463 | __releases(&se_cmd->se_sess->sess_cmd_lock) |
a17f091d | 2464 | { |
7481deb4 NB |
2465 | struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref); |
2466 | struct se_session *se_sess = se_cmd->se_sess; | |
a17f091d | 2467 | |
a17f091d | 2468 | if (list_empty(&se_cmd->se_cmd_list)) { |
ccf5ae83 | 2469 | spin_unlock(&se_sess->sess_cmd_lock); |
ffc32d52 | 2470 | se_cmd->se_tfo->release_cmd(se_cmd); |
7481deb4 | 2471 | return; |
a17f091d | 2472 | } |
a17f091d | 2473 | if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) { |
ccf5ae83 | 2474 | spin_unlock(&se_sess->sess_cmd_lock); |
a17f091d | 2475 | complete(&se_cmd->cmd_wait_comp); |
7481deb4 | 2476 | return; |
a17f091d NB |
2477 | } |
2478 | list_del(&se_cmd->se_cmd_list); | |
ccf5ae83 | 2479 | spin_unlock(&se_sess->sess_cmd_lock); |
a17f091d | 2480 | |
7481deb4 NB |
2481 | se_cmd->se_tfo->release_cmd(se_cmd); |
2482 | } | |
2483 | ||
2484 | /* target_put_sess_cmd - Check for active I/O shutdown via kref_put | |
2485 | * @se_sess: session to reference | |
2486 | * @se_cmd: command descriptor to drop | |
2487 | */ | |
2488 | int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd) | |
2489 | { | |
0ed6e189 NB |
2490 | if (!se_sess) { |
2491 | se_cmd->se_tfo->release_cmd(se_cmd); | |
2492 | return 1; | |
2493 | } | |
ccf5ae83 JE |
2494 | return kref_put_spinlock_irqsave(&se_cmd->cmd_kref, target_release_cmd_kref, |
2495 | &se_sess->sess_cmd_lock); | |
a17f091d NB |
2496 | } |
2497 | EXPORT_SYMBOL(target_put_sess_cmd); | |
2498 | ||
1c7b13fe RD |
2499 | /* target_sess_cmd_list_set_waiting - Flag all commands in |
2500 | * sess_cmd_list to complete cmd_wait_comp. Set | |
2501 | * sess_tearing_down so no more commands are queued. | |
2502 | * @se_sess: session to flag | |
a17f091d | 2503 | */ |
1c7b13fe | 2504 | void target_sess_cmd_list_set_waiting(struct se_session *se_sess) |
a17f091d NB |
2505 | { |
2506 | struct se_cmd *se_cmd; | |
2507 | unsigned long flags; | |
2508 | ||
a17f091d | 2509 | spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); |
9b31a328 NB |
2510 | if (se_sess->sess_tearing_down) { |
2511 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); | |
2512 | return; | |
2513 | } | |
1c7b13fe | 2514 | se_sess->sess_tearing_down = 1; |
9b31a328 | 2515 | list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list); |
a17f091d | 2516 | |
9b31a328 | 2517 | list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list) |
a17f091d NB |
2518 | se_cmd->cmd_wait_set = 1; |
2519 | ||
2520 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); | |
2521 | } | |
1c7b13fe | 2522 | EXPORT_SYMBOL(target_sess_cmd_list_set_waiting); |
a17f091d NB |
2523 | |
2524 | /* target_wait_for_sess_cmds - Wait for outstanding descriptors | |
2525 | * @se_sess: session to wait for active I/O | |
a17f091d | 2526 | */ |
be646c2d | 2527 | void target_wait_for_sess_cmds(struct se_session *se_sess) |
a17f091d NB |
2528 | { |
2529 | struct se_cmd *se_cmd, *tmp_cmd; | |
9b31a328 | 2530 | unsigned long flags; |
a17f091d NB |
2531 | |
2532 | list_for_each_entry_safe(se_cmd, tmp_cmd, | |
9b31a328 | 2533 | &se_sess->sess_wait_list, se_cmd_list) { |
a17f091d NB |
2534 | list_del(&se_cmd->se_cmd_list); |
2535 | ||
2536 | pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:" | |
2537 | " %d\n", se_cmd, se_cmd->t_state, | |
2538 | se_cmd->se_tfo->get_cmd_state(se_cmd)); | |
2539 | ||
be646c2d JE |
2540 | wait_for_completion(&se_cmd->cmd_wait_comp); |
2541 | pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d" | |
2542 | " fabric state: %d\n", se_cmd, se_cmd->t_state, | |
2543 | se_cmd->se_tfo->get_cmd_state(se_cmd)); | |
a17f091d NB |
2544 | |
2545 | se_cmd->se_tfo->release_cmd(se_cmd); | |
2546 | } | |
9b31a328 NB |
2547 | |
2548 | spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); | |
2549 | WARN_ON(!list_empty(&se_sess->sess_cmd_list)); | |
2550 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); | |
2551 | ||
a17f091d NB |
2552 | } |
2553 | EXPORT_SYMBOL(target_wait_for_sess_cmds); | |
2554 | ||
5277797d | 2555 | static int transport_clear_lun_ref_thread(void *p) |
c66ac9db | 2556 | { |
8359cf43 | 2557 | struct se_lun *lun = p; |
c66ac9db | 2558 | |
5277797d NB |
2559 | percpu_ref_kill(&lun->lun_ref); |
2560 | ||
2561 | wait_for_completion(&lun->lun_ref_comp); | |
c66ac9db NB |
2562 | complete(&lun->lun_shutdown_comp); |
2563 | ||
2564 | return 0; | |
2565 | } | |
2566 | ||
5277797d | 2567 | int transport_clear_lun_ref(struct se_lun *lun) |
c66ac9db NB |
2568 | { |
2569 | struct task_struct *kt; | |
2570 | ||
5277797d | 2571 | kt = kthread_run(transport_clear_lun_ref_thread, lun, |
c66ac9db NB |
2572 | "tcm_cl_%u", lun->unpacked_lun); |
2573 | if (IS_ERR(kt)) { | |
6708bb27 | 2574 | pr_err("Unable to start clear_lun thread\n"); |
e3d6f909 | 2575 | return PTR_ERR(kt); |
c66ac9db NB |
2576 | } |
2577 | wait_for_completion(&lun->lun_shutdown_comp); | |
2578 | ||
2579 | return 0; | |
2580 | } | |
2581 | ||
d14921d6 NB |
2582 | /** |
2583 | * transport_wait_for_tasks - wait for completion to occur | |
2584 | * @cmd: command to wait | |
c66ac9db | 2585 | * |
d14921d6 NB |
2586 | * Called from frontend fabric context to wait for storage engine |
2587 | * to pause and/or release frontend generated struct se_cmd. | |
c66ac9db | 2588 | */ |
a17f091d | 2589 | bool transport_wait_for_tasks(struct se_cmd *cmd) |
c66ac9db NB |
2590 | { |
2591 | unsigned long flags; | |
2592 | ||
a1d8b49a | 2593 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c8e31f26 AG |
2594 | if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && |
2595 | !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) { | |
d14921d6 | 2596 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
a17f091d | 2597 | return false; |
d14921d6 | 2598 | } |
cb4f4d3c | 2599 | |
c8e31f26 AG |
2600 | if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) && |
2601 | !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) { | |
d14921d6 | 2602 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
a17f091d | 2603 | return false; |
d14921d6 | 2604 | } |
7d680f3b | 2605 | |
3d28934a | 2606 | if (!(cmd->transport_state & CMD_T_ACTIVE)) { |
d14921d6 | 2607 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
a17f091d | 2608 | return false; |
d14921d6 | 2609 | } |
c66ac9db | 2610 | |
7d680f3b | 2611 | cmd->transport_state |= CMD_T_STOP; |
c66ac9db | 2612 | |
6708bb27 | 2613 | pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x" |
7d680f3b | 2614 | " i_state: %d, t_state: %d, CMD_T_STOP\n", |
f2da9dbd CH |
2615 | cmd, cmd->se_tfo->get_task_tag(cmd), |
2616 | cmd->se_tfo->get_cmd_state(cmd), cmd->t_state); | |
c66ac9db | 2617 | |
a1d8b49a | 2618 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 2619 | |
a1d8b49a | 2620 | wait_for_completion(&cmd->t_transport_stop_comp); |
c66ac9db | 2621 | |
a1d8b49a | 2622 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
7d680f3b | 2623 | cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP); |
c66ac9db | 2624 | |
35d1efe8 | 2625 | pr_debug("wait_for_tasks: Stopped wait_for_completion(" |
a1d8b49a | 2626 | "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n", |
e3d6f909 | 2627 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 2628 | |
d14921d6 | 2629 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
a17f091d NB |
2630 | |
2631 | return true; | |
c66ac9db | 2632 | } |
d14921d6 | 2633 | EXPORT_SYMBOL(transport_wait_for_tasks); |
c66ac9db NB |
2634 | |
2635 | static int transport_get_sense_codes( | |
2636 | struct se_cmd *cmd, | |
2637 | u8 *asc, | |
2638 | u8 *ascq) | |
2639 | { | |
2640 | *asc = cmd->scsi_asc; | |
2641 | *ascq = cmd->scsi_ascq; | |
2642 | ||
2643 | return 0; | |
2644 | } | |
2645 | ||
76736db3 SG |
2646 | static |
2647 | void transport_err_sector_info(unsigned char *buffer, sector_t bad_sector) | |
2648 | { | |
2649 | /* Place failed LBA in sense data information descriptor 0. */ | |
2650 | buffer[SPC_ADD_SENSE_LEN_OFFSET] = 0xc; | |
2651 | buffer[SPC_DESC_TYPE_OFFSET] = 0; /* Information */ | |
2652 | buffer[SPC_ADDITIONAL_DESC_LEN_OFFSET] = 0xa; | |
2653 | buffer[SPC_VALIDITY_OFFSET] = 0x80; | |
2654 | ||
2655 | /* Descriptor Information: failing sector */ | |
2656 | put_unaligned_be64(bad_sector, &buffer[12]); | |
2657 | } | |
2658 | ||
de103c93 CH |
2659 | int |
2660 | transport_send_check_condition_and_sense(struct se_cmd *cmd, | |
2661 | sense_reason_t reason, int from_transport) | |
c66ac9db NB |
2662 | { |
2663 | unsigned char *buffer = cmd->sense_buffer; | |
2664 | unsigned long flags; | |
c66ac9db NB |
2665 | u8 asc = 0, ascq = 0; |
2666 | ||
a1d8b49a | 2667 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 2668 | if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) { |
a1d8b49a | 2669 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
2670 | return 0; |
2671 | } | |
2672 | cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION; | |
a1d8b49a | 2673 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
2674 | |
2675 | if (!reason && from_transport) | |
2676 | goto after_reason; | |
2677 | ||
2678 | if (!from_transport) | |
2679 | cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE; | |
9c58b7dd | 2680 | |
c66ac9db NB |
2681 | /* |
2682 | * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses | |
2683 | * SENSE KEY values from include/scsi/scsi.h | |
2684 | */ | |
2685 | switch (reason) { | |
ba829137 HR |
2686 | case TCM_NO_SENSE: |
2687 | /* CURRENT ERROR */ | |
2688 | buffer[0] = 0x70; | |
2689 | buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; | |
2690 | /* Not Ready */ | |
2691 | buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY; | |
2692 | /* NO ADDITIONAL SENSE INFORMATION */ | |
2693 | buffer[SPC_ASC_KEY_OFFSET] = 0; | |
2694 | buffer[SPC_ASCQ_KEY_OFFSET] = 0; | |
2695 | break; | |
c66ac9db | 2696 | case TCM_NON_EXISTENT_LUN: |
eb39d340 | 2697 | /* CURRENT ERROR */ |
9c58b7dd RD |
2698 | buffer[0] = 0x70; |
2699 | buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; | |
eb39d340 | 2700 | /* ILLEGAL REQUEST */ |
9c58b7dd | 2701 | buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; |
eb39d340 | 2702 | /* LOGICAL UNIT NOT SUPPORTED */ |
9c58b7dd | 2703 | buffer[SPC_ASC_KEY_OFFSET] = 0x25; |
eb39d340 | 2704 | break; |
c66ac9db NB |
2705 | case TCM_UNSUPPORTED_SCSI_OPCODE: |
2706 | case TCM_SECTOR_COUNT_TOO_MANY: | |
2707 | /* CURRENT ERROR */ | |
9c58b7dd RD |
2708 | buffer[0] = 0x70; |
2709 | buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; | |
c66ac9db | 2710 | /* ILLEGAL REQUEST */ |
9c58b7dd | 2711 | buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; |
c66ac9db | 2712 | /* INVALID COMMAND OPERATION CODE */ |
9c58b7dd | 2713 | buffer[SPC_ASC_KEY_OFFSET] = 0x20; |
c66ac9db NB |
2714 | break; |
2715 | case TCM_UNKNOWN_MODE_PAGE: | |
2716 | /* CURRENT ERROR */ | |
9c58b7dd RD |
2717 | buffer[0] = 0x70; |
2718 | buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; | |
c66ac9db | 2719 | /* ILLEGAL REQUEST */ |
9c58b7dd | 2720 | buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; |
c66ac9db | 2721 | /* INVALID FIELD IN CDB */ |
9c58b7dd | 2722 | buffer[SPC_ASC_KEY_OFFSET] = 0x24; |
c66ac9db NB |
2723 | break; |
2724 | case TCM_CHECK_CONDITION_ABORT_CMD: | |
2725 | /* CURRENT ERROR */ | |
9c58b7dd RD |
2726 | buffer[0] = 0x70; |
2727 | buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; | |
c66ac9db | 2728 | /* ABORTED COMMAND */ |
9c58b7dd | 2729 | buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; |
c66ac9db | 2730 | /* BUS DEVICE RESET FUNCTION OCCURRED */ |
9c58b7dd RD |
2731 | buffer[SPC_ASC_KEY_OFFSET] = 0x29; |
2732 | buffer[SPC_ASCQ_KEY_OFFSET] = 0x03; | |
c66ac9db NB |
2733 | break; |
2734 | case TCM_INCORRECT_AMOUNT_OF_DATA: | |
2735 | /* CURRENT ERROR */ | |
9c58b7dd RD |
2736 | buffer[0] = 0x70; |
2737 | buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; | |
c66ac9db | 2738 | /* ABORTED COMMAND */ |
9c58b7dd | 2739 | buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; |
c66ac9db | 2740 | /* WRITE ERROR */ |
9c58b7dd | 2741 | buffer[SPC_ASC_KEY_OFFSET] = 0x0c; |
c66ac9db | 2742 | /* NOT ENOUGH UNSOLICITED DATA */ |
9c58b7dd | 2743 | buffer[SPC_ASCQ_KEY_OFFSET] = 0x0d; |
c66ac9db NB |
2744 | break; |
2745 | case TCM_INVALID_CDB_FIELD: | |
2746 | /* CURRENT ERROR */ | |
9c58b7dd RD |
2747 | buffer[0] = 0x70; |
2748 | buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; | |
9fbc8909 | 2749 | /* ILLEGAL REQUEST */ |
9c58b7dd | 2750 | buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; |
c66ac9db | 2751 | /* INVALID FIELD IN CDB */ |
9c58b7dd | 2752 | buffer[SPC_ASC_KEY_OFFSET] = 0x24; |
c66ac9db NB |
2753 | break; |
2754 | case TCM_INVALID_PARAMETER_LIST: | |
2755 | /* CURRENT ERROR */ | |
9c58b7dd RD |
2756 | buffer[0] = 0x70; |
2757 | buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; | |
9fbc8909 | 2758 | /* ILLEGAL REQUEST */ |
9c58b7dd | 2759 | buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; |
c66ac9db | 2760 | /* INVALID FIELD IN PARAMETER LIST */ |
9c58b7dd | 2761 | buffer[SPC_ASC_KEY_OFFSET] = 0x26; |
c66ac9db | 2762 | break; |
bb992e72 RD |
2763 | case TCM_PARAMETER_LIST_LENGTH_ERROR: |
2764 | /* CURRENT ERROR */ | |
2765 | buffer[0] = 0x70; | |
2766 | buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; | |
2767 | /* ILLEGAL REQUEST */ | |
2768 | buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; | |
2769 | /* PARAMETER LIST LENGTH ERROR */ | |
2770 | buffer[SPC_ASC_KEY_OFFSET] = 0x1a; | |
2771 | break; | |
c66ac9db NB |
2772 | case TCM_UNEXPECTED_UNSOLICITED_DATA: |
2773 | /* CURRENT ERROR */ | |
9c58b7dd RD |
2774 | buffer[0] = 0x70; |
2775 | buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; | |
c66ac9db | 2776 | /* ABORTED COMMAND */ |
9c58b7dd | 2777 | buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; |
c66ac9db | 2778 | /* WRITE ERROR */ |
9c58b7dd | 2779 | buffer[SPC_ASC_KEY_OFFSET] = 0x0c; |
c66ac9db | 2780 | /* UNEXPECTED_UNSOLICITED_DATA */ |
9c58b7dd | 2781 | buffer[SPC_ASCQ_KEY_OFFSET] = 0x0c; |
c66ac9db NB |
2782 | break; |
2783 | case TCM_SERVICE_CRC_ERROR: | |
2784 | /* CURRENT ERROR */ | |
9c58b7dd RD |
2785 | buffer[0] = 0x70; |
2786 | buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; | |
c66ac9db | 2787 | /* ABORTED COMMAND */ |
9c58b7dd | 2788 | buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; |
c66ac9db | 2789 | /* PROTOCOL SERVICE CRC ERROR */ |
9c58b7dd | 2790 | buffer[SPC_ASC_KEY_OFFSET] = 0x47; |
c66ac9db | 2791 | /* N/A */ |
9c58b7dd | 2792 | buffer[SPC_ASCQ_KEY_OFFSET] = 0x05; |
c66ac9db NB |
2793 | break; |
2794 | case TCM_SNACK_REJECTED: | |
2795 | /* CURRENT ERROR */ | |
9c58b7dd RD |
2796 | buffer[0] = 0x70; |
2797 | buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; | |
c66ac9db | 2798 | /* ABORTED COMMAND */ |
9c58b7dd | 2799 | buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; |
c66ac9db | 2800 | /* READ ERROR */ |
9c58b7dd | 2801 | buffer[SPC_ASC_KEY_OFFSET] = 0x11; |
c66ac9db | 2802 | /* FAILED RETRANSMISSION REQUEST */ |
9c58b7dd | 2803 | buffer[SPC_ASCQ_KEY_OFFSET] = 0x13; |
c66ac9db NB |
2804 | break; |
2805 | case TCM_WRITE_PROTECTED: | |
2806 | /* CURRENT ERROR */ | |
9c58b7dd RD |
2807 | buffer[0] = 0x70; |
2808 | buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; | |
c66ac9db | 2809 | /* DATA PROTECT */ |
9c58b7dd | 2810 | buffer[SPC_SENSE_KEY_OFFSET] = DATA_PROTECT; |
c66ac9db | 2811 | /* WRITE PROTECTED */ |
9c58b7dd | 2812 | buffer[SPC_ASC_KEY_OFFSET] = 0x27; |
c66ac9db | 2813 | break; |
e2397c70 RD |
2814 | case TCM_ADDRESS_OUT_OF_RANGE: |
2815 | /* CURRENT ERROR */ | |
9c58b7dd RD |
2816 | buffer[0] = 0x70; |
2817 | buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; | |
e2397c70 | 2818 | /* ILLEGAL REQUEST */ |
9c58b7dd | 2819 | buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; |
e2397c70 | 2820 | /* LOGICAL BLOCK ADDRESS OUT OF RANGE */ |
9c58b7dd | 2821 | buffer[SPC_ASC_KEY_OFFSET] = 0x21; |
e2397c70 | 2822 | break; |
c66ac9db NB |
2823 | case TCM_CHECK_CONDITION_UNIT_ATTENTION: |
2824 | /* CURRENT ERROR */ | |
9c58b7dd RD |
2825 | buffer[0] = 0x70; |
2826 | buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; | |
c66ac9db | 2827 | /* UNIT ATTENTION */ |
9c58b7dd | 2828 | buffer[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION; |
c66ac9db | 2829 | core_scsi3_ua_for_check_condition(cmd, &asc, &ascq); |
9c58b7dd RD |
2830 | buffer[SPC_ASC_KEY_OFFSET] = asc; |
2831 | buffer[SPC_ASCQ_KEY_OFFSET] = ascq; | |
c66ac9db NB |
2832 | break; |
2833 | case TCM_CHECK_CONDITION_NOT_READY: | |
2834 | /* CURRENT ERROR */ | |
9c58b7dd RD |
2835 | buffer[0] = 0x70; |
2836 | buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; | |
c66ac9db | 2837 | /* Not Ready */ |
9c58b7dd | 2838 | buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY; |
c66ac9db | 2839 | transport_get_sense_codes(cmd, &asc, &ascq); |
9c58b7dd RD |
2840 | buffer[SPC_ASC_KEY_OFFSET] = asc; |
2841 | buffer[SPC_ASCQ_KEY_OFFSET] = ascq; | |
c66ac9db | 2842 | break; |
818b571c NB |
2843 | case TCM_MISCOMPARE_VERIFY: |
2844 | /* CURRENT ERROR */ | |
2845 | buffer[0] = 0x70; | |
2846 | buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; | |
2847 | buffer[SPC_SENSE_KEY_OFFSET] = MISCOMPARE; | |
2848 | /* MISCOMPARE DURING VERIFY OPERATION */ | |
2849 | buffer[SPC_ASC_KEY_OFFSET] = 0x1d; | |
2850 | buffer[SPC_ASCQ_KEY_OFFSET] = 0x00; | |
2851 | break; | |
fcc4f17b NB |
2852 | case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED: |
2853 | /* CURRENT ERROR */ | |
2854 | buffer[0] = 0x70; | |
2855 | buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; | |
2856 | /* ILLEGAL REQUEST */ | |
2857 | buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; | |
2858 | /* LOGICAL BLOCK GUARD CHECK FAILED */ | |
2859 | buffer[SPC_ASC_KEY_OFFSET] = 0x10; | |
2860 | buffer[SPC_ASCQ_KEY_OFFSET] = 0x01; | |
76736db3 | 2861 | transport_err_sector_info(buffer, cmd->bad_sector); |
fcc4f17b NB |
2862 | break; |
2863 | case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED: | |
2864 | /* CURRENT ERROR */ | |
2865 | buffer[0] = 0x70; | |
2866 | buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; | |
2867 | /* ILLEGAL REQUEST */ | |
2868 | buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; | |
2869 | /* LOGICAL BLOCK APPLICATION TAG CHECK FAILED */ | |
2870 | buffer[SPC_ASC_KEY_OFFSET] = 0x10; | |
2871 | buffer[SPC_ASCQ_KEY_OFFSET] = 0x02; | |
76736db3 | 2872 | transport_err_sector_info(buffer, cmd->bad_sector); |
fcc4f17b NB |
2873 | break; |
2874 | case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED: | |
2875 | /* CURRENT ERROR */ | |
2876 | buffer[0] = 0x70; | |
2877 | buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; | |
2878 | /* ILLEGAL REQUEST */ | |
2879 | buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; | |
2880 | /* LOGICAL BLOCK REFERENCE TAG CHECK FAILED */ | |
2881 | buffer[SPC_ASC_KEY_OFFSET] = 0x10; | |
2882 | buffer[SPC_ASCQ_KEY_OFFSET] = 0x03; | |
76736db3 | 2883 | transport_err_sector_info(buffer, cmd->bad_sector); |
fcc4f17b | 2884 | break; |
c66ac9db NB |
2885 | case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE: |
2886 | default: | |
2887 | /* CURRENT ERROR */ | |
9c58b7dd RD |
2888 | buffer[0] = 0x70; |
2889 | buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; | |
ad673282 JE |
2890 | /* |
2891 | * Returning ILLEGAL REQUEST would cause immediate IO errors on | |
2892 | * Solaris initiators. Returning NOT READY instead means the | |
2893 | * operations will be retried a finite number of times and we | |
2894 | * can survive intermittent errors. | |
2895 | */ | |
2896 | buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY; | |
c66ac9db | 2897 | /* LOGICAL UNIT COMMUNICATION FAILURE */ |
18a9df42 | 2898 | buffer[SPC_ASC_KEY_OFFSET] = 0x08; |
c66ac9db NB |
2899 | break; |
2900 | } | |
2901 | /* | |
2902 | * This code uses linux/include/scsi/scsi.h SAM status codes! | |
2903 | */ | |
2904 | cmd->scsi_status = SAM_STAT_CHECK_CONDITION; | |
2905 | /* | |
2906 | * Automatically padded, this value is encoded in the fabric's | |
2907 | * data_length response PDU containing the SCSI defined sense data. | |
2908 | */ | |
9c58b7dd | 2909 | cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER; |
c66ac9db NB |
2910 | |
2911 | after_reason: | |
e5c0d6ad | 2912 | trace_target_cmd_complete(cmd); |
07bde79a | 2913 | return cmd->se_tfo->queue_status(cmd); |
c66ac9db NB |
2914 | } |
2915 | EXPORT_SYMBOL(transport_send_check_condition_and_sense); | |
2916 | ||
2917 | int transport_check_aborted_status(struct se_cmd *cmd, int send_status) | |
2918 | { | |
c18bc7d8 RD |
2919 | if (!(cmd->transport_state & CMD_T_ABORTED)) |
2920 | return 0; | |
c66ac9db | 2921 | |
68259b5a AL |
2922 | /* |
2923 | * If cmd has been aborted but either no status is to be sent or it has | |
2924 | * already been sent, just return | |
2925 | */ | |
2926 | if (!send_status || !(cmd->se_cmd_flags & SCF_SEND_DELAYED_TAS)) | |
c18bc7d8 | 2927 | return 1; |
8b1e1244 | 2928 | |
c18bc7d8 RD |
2929 | pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB: 0x%02x ITT: 0x%08x\n", |
2930 | cmd->t_task_cdb[0], cmd->se_tfo->get_task_tag(cmd)); | |
8b1e1244 | 2931 | |
68259b5a | 2932 | cmd->se_cmd_flags &= ~SCF_SEND_DELAYED_TAS; |
29f4c090 | 2933 | cmd->scsi_status = SAM_STAT_TASK_ABORTED; |
e5c0d6ad | 2934 | trace_target_cmd_complete(cmd); |
c18bc7d8 RD |
2935 | cmd->se_tfo->queue_status(cmd); |
2936 | ||
2937 | return 1; | |
c66ac9db NB |
2938 | } |
2939 | EXPORT_SYMBOL(transport_check_aborted_status); | |
2940 | ||
2941 | void transport_send_task_abort(struct se_cmd *cmd) | |
2942 | { | |
c252f003 NB |
2943 | unsigned long flags; |
2944 | ||
2945 | spin_lock_irqsave(&cmd->t_state_lock, flags); | |
68259b5a | 2946 | if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION)) { |
c252f003 NB |
2947 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
2948 | return; | |
2949 | } | |
2950 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
2951 | ||
c66ac9db NB |
2952 | /* |
2953 | * If there are still expected incoming fabric WRITEs, we wait | |
2954 | * until until they have completed before sending a TASK_ABORTED | |
2955 | * response. This response with TASK_ABORTED status will be | |
2956 | * queued back to fabric module by transport_check_aborted_status(). | |
2957 | */ | |
2958 | if (cmd->data_direction == DMA_TO_DEVICE) { | |
e3d6f909 | 2959 | if (cmd->se_tfo->write_pending_status(cmd) != 0) { |
7d680f3b | 2960 | cmd->transport_state |= CMD_T_ABORTED; |
68259b5a | 2961 | cmd->se_cmd_flags |= SCF_SEND_DELAYED_TAS; |
29f4c090 | 2962 | return; |
c66ac9db NB |
2963 | } |
2964 | } | |
2965 | cmd->scsi_status = SAM_STAT_TASK_ABORTED; | |
8b1e1244 | 2966 | |
72b59d6e RD |
2967 | transport_lun_remove_cmd(cmd); |
2968 | ||
6708bb27 | 2969 | pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x," |
a1d8b49a | 2970 | " ITT: 0x%08x\n", cmd->t_task_cdb[0], |
e3d6f909 | 2971 | cmd->se_tfo->get_task_tag(cmd)); |
8b1e1244 | 2972 | |
e5c0d6ad | 2973 | trace_target_cmd_complete(cmd); |
e3d6f909 | 2974 | cmd->se_tfo->queue_status(cmd); |
c66ac9db NB |
2975 | } |
2976 | ||
af877292 | 2977 | static void target_tmr_work(struct work_struct *work) |
c66ac9db | 2978 | { |
af877292 | 2979 | struct se_cmd *cmd = container_of(work, struct se_cmd, work); |
5951146d | 2980 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
2981 | struct se_tmr_req *tmr = cmd->se_tmr_req; |
2982 | int ret; | |
2983 | ||
2984 | switch (tmr->function) { | |
5c6cd613 | 2985 | case TMR_ABORT_TASK: |
3d28934a | 2986 | core_tmr_abort_task(dev, tmr, cmd->se_sess); |
c66ac9db | 2987 | break; |
5c6cd613 NB |
2988 | case TMR_ABORT_TASK_SET: |
2989 | case TMR_CLEAR_ACA: | |
2990 | case TMR_CLEAR_TASK_SET: | |
c66ac9db NB |
2991 | tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED; |
2992 | break; | |
5c6cd613 | 2993 | case TMR_LUN_RESET: |
c66ac9db NB |
2994 | ret = core_tmr_lun_reset(dev, tmr, NULL, NULL); |
2995 | tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE : | |
2996 | TMR_FUNCTION_REJECTED; | |
2997 | break; | |
5c6cd613 | 2998 | case TMR_TARGET_WARM_RESET: |
c66ac9db NB |
2999 | tmr->response = TMR_FUNCTION_REJECTED; |
3000 | break; | |
5c6cd613 | 3001 | case TMR_TARGET_COLD_RESET: |
c66ac9db NB |
3002 | tmr->response = TMR_FUNCTION_REJECTED; |
3003 | break; | |
c66ac9db | 3004 | default: |
6708bb27 | 3005 | pr_err("Uknown TMR function: 0x%02x.\n", |
c66ac9db NB |
3006 | tmr->function); |
3007 | tmr->response = TMR_FUNCTION_REJECTED; | |
3008 | break; | |
3009 | } | |
3010 | ||
3011 | cmd->t_state = TRANSPORT_ISTATE_PROCESSING; | |
e3d6f909 | 3012 | cmd->se_tfo->queue_tm_rsp(cmd); |
c66ac9db | 3013 | |
b7b8bef7 | 3014 | transport_cmd_check_stop_to_fabric(cmd); |
c66ac9db NB |
3015 | } |
3016 | ||
af877292 CH |
3017 | int transport_generic_handle_tmr( |
3018 | struct se_cmd *cmd) | |
c66ac9db | 3019 | { |
f15e9cd9 NB |
3020 | unsigned long flags; |
3021 | ||
3022 | spin_lock_irqsave(&cmd->t_state_lock, flags); | |
3023 | cmd->transport_state |= CMD_T_ACTIVE; | |
3024 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
3025 | ||
af877292 CH |
3026 | INIT_WORK(&cmd->work, target_tmr_work); |
3027 | queue_work(cmd->se_dev->tmr_wq, &cmd->work); | |
c66ac9db NB |
3028 | return 0; |
3029 | } | |
af877292 | 3030 | EXPORT_SYMBOL(transport_generic_handle_tmr); |