Commit | Line | Data |
---|---|---|
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> |
5538d294 | 37 | #include <linux/vmalloc.h> |
c66ac9db NB |
38 | #include <asm/unaligned.h> |
39 | #include <net/sock.h> | |
40 | #include <net/tcp.h> | |
ba929992 | 41 | #include <scsi/scsi_proto.h> |
9ec1e1ce | 42 | #include <scsi/scsi_common.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 | 47 | |
e26d99ae | 48 | #include "target_core_internal.h" |
c66ac9db | 49 | #include "target_core_alua.h" |
c66ac9db | 50 | #include "target_core_pr.h" |
c66ac9db NB |
51 | #include "target_core_ua.h" |
52 | ||
e5c0d6ad RD |
53 | #define CREATE_TRACE_POINTS |
54 | #include <trace/events/target.h> | |
55 | ||
35e0e757 | 56 | static struct workqueue_struct *target_completion_wq; |
c66ac9db | 57 | static struct kmem_cache *se_sess_cache; |
c66ac9db | 58 | struct kmem_cache *se_ua_cache; |
c66ac9db NB |
59 | struct kmem_cache *t10_pr_reg_cache; |
60 | struct kmem_cache *t10_alua_lu_gp_cache; | |
61 | struct kmem_cache *t10_alua_lu_gp_mem_cache; | |
62 | struct kmem_cache *t10_alua_tg_pt_gp_cache; | |
229d4f11 HR |
63 | struct kmem_cache *t10_alua_lba_map_cache; |
64 | struct kmem_cache *t10_alua_lba_map_mem_cache; | |
c66ac9db | 65 | |
c66ac9db | 66 | static void transport_complete_task_attr(struct se_cmd *cmd); |
fa7e25cf | 67 | static int translate_sense_reason(struct se_cmd *cmd, sense_reason_t reason); |
07bde79a | 68 | static void transport_handle_queue_full(struct se_cmd *cmd, |
fa7e25cf | 69 | struct se_device *dev, int err, bool write_pending); |
d5ddad41 | 70 | static int transport_put_cmd(struct se_cmd *cmd); |
35e0e757 | 71 | static void target_complete_ok_work(struct work_struct *work); |
c66ac9db | 72 | |
e3d6f909 | 73 | int init_se_kmem_caches(void) |
c66ac9db | 74 | { |
c66ac9db NB |
75 | se_sess_cache = kmem_cache_create("se_sess_cache", |
76 | sizeof(struct se_session), __alignof__(struct se_session), | |
77 | 0, NULL); | |
6708bb27 AG |
78 | if (!se_sess_cache) { |
79 | pr_err("kmem_cache_create() for struct se_session" | |
c66ac9db | 80 | " failed\n"); |
c8e31f26 | 81 | goto out; |
c66ac9db NB |
82 | } |
83 | se_ua_cache = kmem_cache_create("se_ua_cache", | |
84 | sizeof(struct se_ua), __alignof__(struct se_ua), | |
85 | 0, NULL); | |
6708bb27 AG |
86 | if (!se_ua_cache) { |
87 | pr_err("kmem_cache_create() for struct se_ua failed\n"); | |
35e0e757 | 88 | goto out_free_sess_cache; |
c66ac9db | 89 | } |
c66ac9db NB |
90 | t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache", |
91 | sizeof(struct t10_pr_registration), | |
92 | __alignof__(struct t10_pr_registration), 0, NULL); | |
6708bb27 AG |
93 | if (!t10_pr_reg_cache) { |
94 | pr_err("kmem_cache_create() for struct t10_pr_registration" | |
c66ac9db | 95 | " failed\n"); |
35e0e757 | 96 | goto out_free_ua_cache; |
c66ac9db NB |
97 | } |
98 | t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache", | |
99 | sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp), | |
100 | 0, NULL); | |
6708bb27 AG |
101 | if (!t10_alua_lu_gp_cache) { |
102 | pr_err("kmem_cache_create() for t10_alua_lu_gp_cache" | |
c66ac9db | 103 | " failed\n"); |
35e0e757 | 104 | goto out_free_pr_reg_cache; |
c66ac9db NB |
105 | } |
106 | t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache", | |
107 | sizeof(struct t10_alua_lu_gp_member), | |
108 | __alignof__(struct t10_alua_lu_gp_member), 0, NULL); | |
6708bb27 AG |
109 | if (!t10_alua_lu_gp_mem_cache) { |
110 | pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_" | |
c66ac9db | 111 | "cache failed\n"); |
35e0e757 | 112 | goto out_free_lu_gp_cache; |
c66ac9db NB |
113 | } |
114 | t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache", | |
115 | sizeof(struct t10_alua_tg_pt_gp), | |
116 | __alignof__(struct t10_alua_tg_pt_gp), 0, NULL); | |
6708bb27 AG |
117 | if (!t10_alua_tg_pt_gp_cache) { |
118 | pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_" | |
c66ac9db | 119 | "cache failed\n"); |
35e0e757 | 120 | goto out_free_lu_gp_mem_cache; |
c66ac9db | 121 | } |
229d4f11 HR |
122 | t10_alua_lba_map_cache = kmem_cache_create( |
123 | "t10_alua_lba_map_cache", | |
124 | sizeof(struct t10_alua_lba_map), | |
125 | __alignof__(struct t10_alua_lba_map), 0, NULL); | |
126 | if (!t10_alua_lba_map_cache) { | |
127 | pr_err("kmem_cache_create() for t10_alua_lba_map_" | |
128 | "cache failed\n"); | |
adf653f9 | 129 | goto out_free_tg_pt_gp_cache; |
229d4f11 HR |
130 | } |
131 | t10_alua_lba_map_mem_cache = kmem_cache_create( | |
132 | "t10_alua_lba_map_mem_cache", | |
133 | sizeof(struct t10_alua_lba_map_member), | |
134 | __alignof__(struct t10_alua_lba_map_member), 0, NULL); | |
135 | if (!t10_alua_lba_map_mem_cache) { | |
136 | pr_err("kmem_cache_create() for t10_alua_lba_map_mem_" | |
137 | "cache failed\n"); | |
138 | goto out_free_lba_map_cache; | |
139 | } | |
c66ac9db | 140 | |
35e0e757 CH |
141 | target_completion_wq = alloc_workqueue("target_completion", |
142 | WQ_MEM_RECLAIM, 0); | |
143 | if (!target_completion_wq) | |
229d4f11 | 144 | goto out_free_lba_map_mem_cache; |
35e0e757 | 145 | |
c66ac9db | 146 | return 0; |
35e0e757 | 147 | |
229d4f11 HR |
148 | out_free_lba_map_mem_cache: |
149 | kmem_cache_destroy(t10_alua_lba_map_mem_cache); | |
150 | out_free_lba_map_cache: | |
151 | kmem_cache_destroy(t10_alua_lba_map_cache); | |
35e0e757 CH |
152 | out_free_tg_pt_gp_cache: |
153 | kmem_cache_destroy(t10_alua_tg_pt_gp_cache); | |
154 | out_free_lu_gp_mem_cache: | |
155 | kmem_cache_destroy(t10_alua_lu_gp_mem_cache); | |
156 | out_free_lu_gp_cache: | |
157 | kmem_cache_destroy(t10_alua_lu_gp_cache); | |
158 | out_free_pr_reg_cache: | |
159 | kmem_cache_destroy(t10_pr_reg_cache); | |
160 | out_free_ua_cache: | |
161 | kmem_cache_destroy(se_ua_cache); | |
162 | out_free_sess_cache: | |
163 | kmem_cache_destroy(se_sess_cache); | |
c66ac9db | 164 | out: |
e3d6f909 | 165 | return -ENOMEM; |
c66ac9db NB |
166 | } |
167 | ||
e3d6f909 | 168 | void release_se_kmem_caches(void) |
c66ac9db | 169 | { |
35e0e757 | 170 | destroy_workqueue(target_completion_wq); |
c66ac9db NB |
171 | kmem_cache_destroy(se_sess_cache); |
172 | kmem_cache_destroy(se_ua_cache); | |
c66ac9db NB |
173 | kmem_cache_destroy(t10_pr_reg_cache); |
174 | kmem_cache_destroy(t10_alua_lu_gp_cache); | |
175 | kmem_cache_destroy(t10_alua_lu_gp_mem_cache); | |
176 | kmem_cache_destroy(t10_alua_tg_pt_gp_cache); | |
229d4f11 HR |
177 | kmem_cache_destroy(t10_alua_lba_map_cache); |
178 | kmem_cache_destroy(t10_alua_lba_map_mem_cache); | |
c66ac9db NB |
179 | } |
180 | ||
e3d6f909 AG |
181 | /* This code ensures unique mib indexes are handed out. */ |
182 | static DEFINE_SPINLOCK(scsi_mib_index_lock); | |
183 | static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX]; | |
e89d15ee NB |
184 | |
185 | /* | |
186 | * Allocate a new row index for the entry type specified | |
187 | */ | |
188 | u32 scsi_get_new_index(scsi_index_t type) | |
189 | { | |
190 | u32 new_index; | |
191 | ||
e3d6f909 | 192 | BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX)); |
e89d15ee | 193 | |
e3d6f909 AG |
194 | spin_lock(&scsi_mib_index_lock); |
195 | new_index = ++scsi_mib_index[type]; | |
196 | spin_unlock(&scsi_mib_index_lock); | |
e89d15ee NB |
197 | |
198 | return new_index; | |
199 | } | |
200 | ||
dbc5623e | 201 | void transport_subsystem_check_init(void) |
c66ac9db NB |
202 | { |
203 | int ret; | |
283669d2 | 204 | static int sub_api_initialized; |
c66ac9db | 205 | |
dbc5623e NB |
206 | if (sub_api_initialized) |
207 | return; | |
208 | ||
c66ac9db NB |
209 | ret = request_module("target_core_iblock"); |
210 | if (ret != 0) | |
6708bb27 | 211 | pr_err("Unable to load target_core_iblock\n"); |
c66ac9db NB |
212 | |
213 | ret = request_module("target_core_file"); | |
214 | if (ret != 0) | |
6708bb27 | 215 | pr_err("Unable to load target_core_file\n"); |
c66ac9db NB |
216 | |
217 | ret = request_module("target_core_pscsi"); | |
218 | if (ret != 0) | |
6708bb27 | 219 | pr_err("Unable to load target_core_pscsi\n"); |
c66ac9db | 220 | |
7c9e7a6f AG |
221 | ret = request_module("target_core_user"); |
222 | if (ret != 0) | |
223 | pr_err("Unable to load target_core_user\n"); | |
224 | ||
e3d6f909 | 225 | sub_api_initialized = 1; |
c66ac9db NB |
226 | } |
227 | ||
e70beee7 | 228 | struct se_session *transport_init_session(enum target_prot_op sup_prot_ops) |
c66ac9db NB |
229 | { |
230 | struct se_session *se_sess; | |
231 | ||
232 | se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL); | |
6708bb27 AG |
233 | if (!se_sess) { |
234 | pr_err("Unable to allocate struct se_session from" | |
c66ac9db NB |
235 | " se_sess_cache\n"); |
236 | return ERR_PTR(-ENOMEM); | |
237 | } | |
238 | INIT_LIST_HEAD(&se_sess->sess_list); | |
239 | INIT_LIST_HEAD(&se_sess->sess_acl_list); | |
a17f091d | 240 | INIT_LIST_HEAD(&se_sess->sess_cmd_list); |
9b31a328 | 241 | INIT_LIST_HEAD(&se_sess->sess_wait_list); |
a17f091d | 242 | spin_lock_init(&se_sess->sess_cmd_lock); |
e70beee7 | 243 | se_sess->sup_prot_ops = sup_prot_ops; |
c66ac9db NB |
244 | |
245 | return se_sess; | |
246 | } | |
247 | EXPORT_SYMBOL(transport_init_session); | |
248 | ||
c0add7fd NB |
249 | int transport_alloc_session_tags(struct se_session *se_sess, |
250 | unsigned int tag_num, unsigned int tag_size) | |
251 | { | |
252 | int rc; | |
253 | ||
8c7f6e9b NB |
254 | se_sess->sess_cmd_map = kzalloc(tag_num * tag_size, |
255 | GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT); | |
c0add7fd | 256 | if (!se_sess->sess_cmd_map) { |
8c7f6e9b NB |
257 | se_sess->sess_cmd_map = vzalloc(tag_num * tag_size); |
258 | if (!se_sess->sess_cmd_map) { | |
259 | pr_err("Unable to allocate se_sess->sess_cmd_map\n"); | |
260 | return -ENOMEM; | |
261 | } | |
c0add7fd NB |
262 | } |
263 | ||
264 | rc = percpu_ida_init(&se_sess->sess_tag_pool, tag_num); | |
265 | if (rc < 0) { | |
266 | pr_err("Unable to init se_sess->sess_tag_pool," | |
267 | " tag_num: %u\n", tag_num); | |
de64d3a6 | 268 | kvfree(se_sess->sess_cmd_map); |
c0add7fd NB |
269 | se_sess->sess_cmd_map = NULL; |
270 | return -ENOMEM; | |
271 | } | |
272 | ||
273 | return 0; | |
274 | } | |
275 | EXPORT_SYMBOL(transport_alloc_session_tags); | |
276 | ||
277 | struct se_session *transport_init_session_tags(unsigned int tag_num, | |
e70beee7 NB |
278 | unsigned int tag_size, |
279 | enum target_prot_op sup_prot_ops) | |
c0add7fd NB |
280 | { |
281 | struct se_session *se_sess; | |
282 | int rc; | |
283 | ||
7861728d NB |
284 | if (tag_num != 0 && !tag_size) { |
285 | pr_err("init_session_tags called with percpu-ida tag_num:" | |
286 | " %u, but zero tag_size\n", tag_num); | |
287 | return ERR_PTR(-EINVAL); | |
288 | } | |
289 | if (!tag_num && tag_size) { | |
290 | pr_err("init_session_tags called with percpu-ida tag_size:" | |
291 | " %u, but zero tag_num\n", tag_size); | |
292 | return ERR_PTR(-EINVAL); | |
293 | } | |
294 | ||
e70beee7 | 295 | se_sess = transport_init_session(sup_prot_ops); |
c0add7fd NB |
296 | if (IS_ERR(se_sess)) |
297 | return se_sess; | |
298 | ||
299 | rc = transport_alloc_session_tags(se_sess, tag_num, tag_size); | |
300 | if (rc < 0) { | |
301 | transport_free_session(se_sess); | |
302 | return ERR_PTR(-ENOMEM); | |
303 | } | |
304 | ||
305 | return se_sess; | |
306 | } | |
307 | EXPORT_SYMBOL(transport_init_session_tags); | |
308 | ||
c66ac9db | 309 | /* |
140854cb | 310 | * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called. |
c66ac9db NB |
311 | */ |
312 | void __transport_register_session( | |
313 | struct se_portal_group *se_tpg, | |
314 | struct se_node_acl *se_nacl, | |
315 | struct se_session *se_sess, | |
316 | void *fabric_sess_ptr) | |
317 | { | |
9ac8928e | 318 | const struct target_core_fabric_ops *tfo = se_tpg->se_tpg_tfo; |
c66ac9db NB |
319 | unsigned char buf[PR_REG_ISID_LEN]; |
320 | ||
321 | se_sess->se_tpg = se_tpg; | |
322 | se_sess->fabric_sess_ptr = fabric_sess_ptr; | |
323 | /* | |
324 | * Used by struct se_node_acl's under ConfigFS to locate active se_session-t | |
325 | * | |
326 | * Only set for struct se_session's that will actually be moving I/O. | |
327 | * eg: *NOT* discovery sessions. | |
328 | */ | |
329 | if (se_nacl) { | |
bffb5128 NB |
330 | /* |
331 | * | |
332 | * Determine if fabric allows for T10-PI feature bits exposed to | |
333 | * initiators for device backends with !dev->dev_attrib.pi_prot_type. | |
334 | * | |
335 | * If so, then always save prot_type on a per se_node_acl node | |
336 | * basis and re-instate the previous sess_prot_type to avoid | |
337 | * disabling PI from below any previously initiator side | |
338 | * registered LUNs. | |
339 | */ | |
340 | if (se_nacl->saved_prot_type) | |
341 | se_sess->sess_prot_type = se_nacl->saved_prot_type; | |
342 | else if (tfo->tpg_check_prot_fabric_only) | |
343 | se_sess->sess_prot_type = se_nacl->saved_prot_type = | |
344 | tfo->tpg_check_prot_fabric_only(se_tpg); | |
c66ac9db NB |
345 | /* |
346 | * If the fabric module supports an ISID based TransportID, | |
347 | * save this value in binary from the fabric I_T Nexus now. | |
348 | */ | |
e3d6f909 | 349 | if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { |
c66ac9db | 350 | memset(&buf[0], 0, PR_REG_ISID_LEN); |
e3d6f909 | 351 | se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, |
c66ac9db NB |
352 | &buf[0], PR_REG_ISID_LEN); |
353 | se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]); | |
354 | } | |
afb999ff | 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 | ||
7861728d NB |
388 | struct se_session * |
389 | target_alloc_session(struct se_portal_group *tpg, | |
390 | unsigned int tag_num, unsigned int tag_size, | |
391 | enum target_prot_op prot_op, | |
392 | const char *initiatorname, void *private, | |
393 | int (*callback)(struct se_portal_group *, | |
394 | struct se_session *, void *)) | |
395 | { | |
396 | struct se_session *sess; | |
397 | ||
398 | /* | |
399 | * If the fabric driver is using percpu-ida based pre allocation | |
400 | * of I/O descriptor tags, go ahead and perform that setup now.. | |
401 | */ | |
402 | if (tag_num != 0) | |
403 | sess = transport_init_session_tags(tag_num, tag_size, prot_op); | |
404 | else | |
405 | sess = transport_init_session(prot_op); | |
406 | ||
407 | if (IS_ERR(sess)) | |
408 | return sess; | |
409 | ||
410 | sess->se_node_acl = core_tpg_check_initiator_node_acl(tpg, | |
411 | (unsigned char *)initiatorname); | |
412 | if (!sess->se_node_acl) { | |
413 | transport_free_session(sess); | |
414 | return ERR_PTR(-EACCES); | |
415 | } | |
416 | /* | |
417 | * Go ahead and perform any remaining fabric setup that is | |
418 | * required before transport_register_session(). | |
419 | */ | |
420 | if (callback != NULL) { | |
421 | int rc = callback(tpg, sess, private); | |
422 | if (rc) { | |
423 | transport_free_session(sess); | |
424 | return ERR_PTR(rc); | |
425 | } | |
426 | } | |
427 | ||
428 | transport_register_session(tpg, sess->se_node_acl, sess, private); | |
429 | return sess; | |
430 | } | |
431 | EXPORT_SYMBOL(target_alloc_session); | |
432 | ||
f8e471f9 NB |
433 | ssize_t target_show_dynamic_sessions(struct se_portal_group *se_tpg, char *page) |
434 | { | |
435 | struct se_session *se_sess; | |
436 | ssize_t len = 0; | |
437 | ||
438 | spin_lock_bh(&se_tpg->session_lock); | |
439 | list_for_each_entry(se_sess, &se_tpg->tpg_sess_list, sess_list) { | |
440 | if (!se_sess->se_node_acl) | |
441 | continue; | |
442 | if (!se_sess->se_node_acl->dynamic_node_acl) | |
443 | continue; | |
444 | if (strlen(se_sess->se_node_acl->initiatorname) + 1 + len > PAGE_SIZE) | |
445 | break; | |
446 | ||
447 | len += snprintf(page + len, PAGE_SIZE - len, "%s\n", | |
448 | se_sess->se_node_acl->initiatorname); | |
449 | len += 1; /* Include NULL terminator */ | |
450 | } | |
451 | spin_unlock_bh(&se_tpg->session_lock); | |
452 | ||
453 | return len; | |
454 | } | |
455 | EXPORT_SYMBOL(target_show_dynamic_sessions); | |
456 | ||
afb999ff NB |
457 | static void target_complete_nacl(struct kref *kref) |
458 | { | |
459 | struct se_node_acl *nacl = container_of(kref, | |
460 | struct se_node_acl, acl_kref); | |
01d4d673 | 461 | struct se_portal_group *se_tpg = nacl->se_tpg; |
afb999ff | 462 | |
01d4d673 NB |
463 | if (!nacl->dynamic_stop) { |
464 | complete(&nacl->acl_free_comp); | |
465 | return; | |
466 | } | |
467 | ||
468 | mutex_lock(&se_tpg->acl_node_mutex); | |
469 | list_del(&nacl->acl_list); | |
470 | mutex_unlock(&se_tpg->acl_node_mutex); | |
471 | ||
472 | core_tpg_wait_for_nacl_pr_ref(nacl); | |
473 | core_free_device_list_for_node(nacl, se_tpg); | |
474 | kfree(nacl); | |
afb999ff NB |
475 | } |
476 | ||
477 | void target_put_nacl(struct se_node_acl *nacl) | |
478 | { | |
479 | kref_put(&nacl->acl_kref, target_complete_nacl); | |
480 | } | |
21aaa23b | 481 | EXPORT_SYMBOL(target_put_nacl); |
afb999ff | 482 | |
c66ac9db NB |
483 | void transport_deregister_session_configfs(struct se_session *se_sess) |
484 | { | |
485 | struct se_node_acl *se_nacl; | |
23388864 | 486 | unsigned long flags; |
c66ac9db NB |
487 | /* |
488 | * Used by struct se_node_acl's under ConfigFS to locate active struct se_session | |
489 | */ | |
490 | se_nacl = se_sess->se_node_acl; | |
6708bb27 | 491 | if (se_nacl) { |
23388864 | 492 | spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags); |
fba81f88 CH |
493 | if (!list_empty(&se_sess->sess_acl_list)) |
494 | list_del_init(&se_sess->sess_acl_list); | |
c66ac9db NB |
495 | /* |
496 | * If the session list is empty, then clear the pointer. | |
497 | * Otherwise, set the struct se_session pointer from the tail | |
498 | * element of the per struct se_node_acl active session list. | |
499 | */ | |
500 | if (list_empty(&se_nacl->acl_sess_list)) | |
501 | se_nacl->nacl_sess = NULL; | |
502 | else { | |
503 | se_nacl->nacl_sess = container_of( | |
504 | se_nacl->acl_sess_list.prev, | |
505 | struct se_session, sess_acl_list); | |
506 | } | |
23388864 | 507 | spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags); |
c66ac9db NB |
508 | } |
509 | } | |
510 | EXPORT_SYMBOL(transport_deregister_session_configfs); | |
511 | ||
512 | void transport_free_session(struct se_session *se_sess) | |
513 | { | |
21aaa23b | 514 | struct se_node_acl *se_nacl = se_sess->se_node_acl; |
01d4d673 | 515 | |
21aaa23b NB |
516 | /* |
517 | * Drop the se_node_acl->nacl_kref obtained from within | |
518 | * core_tpg_get_initiator_node_acl(). | |
519 | */ | |
520 | if (se_nacl) { | |
01d4d673 NB |
521 | struct se_portal_group *se_tpg = se_nacl->se_tpg; |
522 | const struct target_core_fabric_ops *se_tfo = se_tpg->se_tpg_tfo; | |
523 | unsigned long flags; | |
524 | ||
21aaa23b | 525 | se_sess->se_node_acl = NULL; |
01d4d673 NB |
526 | |
527 | /* | |
528 | * Also determine if we need to drop the extra ->cmd_kref if | |
529 | * it had been previously dynamically generated, and | |
530 | * the endpoint is not caching dynamic ACLs. | |
531 | */ | |
532 | mutex_lock(&se_tpg->acl_node_mutex); | |
533 | if (se_nacl->dynamic_node_acl && | |
534 | !se_tfo->tpg_check_demo_mode_cache(se_tpg)) { | |
535 | spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags); | |
536 | if (list_empty(&se_nacl->acl_sess_list)) | |
537 | se_nacl->dynamic_stop = true; | |
538 | spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags); | |
539 | ||
540 | if (se_nacl->dynamic_stop) | |
541 | list_del(&se_nacl->acl_list); | |
542 | } | |
543 | mutex_unlock(&se_tpg->acl_node_mutex); | |
544 | ||
545 | if (se_nacl->dynamic_stop) | |
546 | target_put_nacl(se_nacl); | |
547 | ||
21aaa23b NB |
548 | target_put_nacl(se_nacl); |
549 | } | |
c0add7fd NB |
550 | if (se_sess->sess_cmd_map) { |
551 | percpu_ida_destroy(&se_sess->sess_tag_pool); | |
de64d3a6 | 552 | kvfree(se_sess->sess_cmd_map); |
c0add7fd | 553 | } |
c66ac9db NB |
554 | kmem_cache_free(se_sess_cache, se_sess); |
555 | } | |
556 | EXPORT_SYMBOL(transport_free_session); | |
557 | ||
558 | void transport_deregister_session(struct se_session *se_sess) | |
559 | { | |
560 | struct se_portal_group *se_tpg = se_sess->se_tpg; | |
e63a8e19 | 561 | unsigned long flags; |
c66ac9db | 562 | |
6708bb27 | 563 | if (!se_tpg) { |
c66ac9db NB |
564 | transport_free_session(se_sess); |
565 | return; | |
566 | } | |
c66ac9db | 567 | |
e63a8e19 | 568 | spin_lock_irqsave(&se_tpg->session_lock, flags); |
c66ac9db NB |
569 | list_del(&se_sess->sess_list); |
570 | se_sess->se_tpg = NULL; | |
571 | se_sess->fabric_sess_ptr = NULL; | |
e63a8e19 | 572 | spin_unlock_irqrestore(&se_tpg->session_lock, flags); |
c66ac9db | 573 | |
6708bb27 | 574 | pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n", |
e3d6f909 | 575 | se_tpg->se_tpg_tfo->get_fabric_name()); |
01468346 | 576 | /* |
125d0119 | 577 | * If last kref is dropping now for an explicit NodeACL, awake sleeping |
afb999ff | 578 | * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group |
21aaa23b | 579 | * removal context from within transport_free_session() code. |
01d4d673 NB |
580 | * |
581 | * For dynamic ACL, target_put_nacl() uses target_complete_nacl() | |
582 | * to release all remaining generate_node_acl=1 created ACL resources. | |
01468346 | 583 | */ |
01468346 | 584 | |
afb999ff | 585 | transport_free_session(se_sess); |
c66ac9db NB |
586 | } |
587 | EXPORT_SYMBOL(transport_deregister_session); | |
588 | ||
cf572a96 | 589 | static void target_remove_from_state_list(struct se_cmd *cmd) |
c66ac9db | 590 | { |
42bf829e | 591 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
592 | unsigned long flags; |
593 | ||
42bf829e CH |
594 | if (!dev) |
595 | return; | |
c66ac9db | 596 | |
cf572a96 CH |
597 | spin_lock_irqsave(&dev->execute_task_lock, flags); |
598 | if (cmd->state_active) { | |
599 | list_del(&cmd->state_list); | |
cf572a96 | 600 | cmd->state_active = false; |
c66ac9db | 601 | } |
cf572a96 | 602 | spin_unlock_irqrestore(&dev->execute_task_lock, flags); |
c66ac9db NB |
603 | } |
604 | ||
b1a2ecda | 605 | static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd) |
c66ac9db NB |
606 | { |
607 | unsigned long flags; | |
608 | ||
b1a2ecda | 609 | target_remove_from_state_list(cmd); |
f7113a47 | 610 | |
b1a2ecda BVA |
611 | /* |
612 | * Clear struct se_cmd->se_lun before the handoff to FE. | |
613 | */ | |
614 | cmd->se_lun = NULL; | |
f7113a47 | 615 | |
febe562c | 616 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db NB |
617 | /* |
618 | * Determine if frontend context caller is requesting the stopping of | |
e3d6f909 | 619 | * this command for frontend exceptions. |
c66ac9db | 620 | */ |
7d680f3b | 621 | if (cmd->transport_state & CMD_T_STOP) { |
649ee054 BVA |
622 | pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n", |
623 | __func__, __LINE__, cmd->tag); | |
c66ac9db | 624 | |
a1d8b49a | 625 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 626 | |
a95d6511 | 627 | complete_all(&cmd->t_transport_stop_comp); |
c66ac9db NB |
628 | return 1; |
629 | } | |
f7113a47 | 630 | cmd->transport_state &= ~CMD_T_ACTIVE; |
a1d8b49a | 631 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 632 | |
b1a2ecda BVA |
633 | /* |
634 | * Some fabric modules like tcm_loop can release their internally | |
635 | * allocated I/O reference and struct se_cmd now. | |
636 | * | |
637 | * Fabric modules are expected to return '1' here if the se_cmd being | |
638 | * passed is released at this point, or zero if not being released. | |
639 | */ | |
9c28ca4f | 640 | return cmd->se_tfo->check_stop_free(cmd); |
c66ac9db NB |
641 | } |
642 | ||
643 | static void transport_lun_remove_cmd(struct se_cmd *cmd) | |
644 | { | |
e3d6f909 | 645 | struct se_lun *lun = cmd->se_lun; |
c66ac9db | 646 | |
5259a06e | 647 | if (!lun) |
c66ac9db NB |
648 | return; |
649 | ||
5259a06e NB |
650 | if (cmpxchg(&cmd->lun_ref_active, true, false)) |
651 | percpu_ref_put(&lun->lun_ref); | |
c66ac9db NB |
652 | } |
653 | ||
654 | void transport_cmd_finish_abort(struct se_cmd *cmd, int remove) | |
655 | { | |
febe562c NB |
656 | bool ack_kref = (cmd->se_cmd_flags & SCF_ACK_KREF); |
657 | ||
68259b5a AL |
658 | if (cmd->se_cmd_flags & SCF_SE_LUN_CMD) |
659 | transport_lun_remove_cmd(cmd); | |
131e6abc NB |
660 | /* |
661 | * Allow the fabric driver to unmap any resources before | |
662 | * releasing the descriptor via TFO->release_cmd() | |
663 | */ | |
664 | if (remove) | |
665 | cmd->se_tfo->aborted_task(cmd); | |
68259b5a | 666 | |
c66ac9db NB |
667 | if (transport_cmd_check_stop_to_fabric(cmd)) |
668 | return; | |
febe562c | 669 | if (remove && ack_kref) |
e6a2573f | 670 | transport_put_cmd(cmd); |
c66ac9db NB |
671 | } |
672 | ||
35e0e757 CH |
673 | static void target_complete_failure_work(struct work_struct *work) |
674 | { | |
675 | struct se_cmd *cmd = container_of(work, struct se_cmd, work); | |
676 | ||
de103c93 CH |
677 | transport_generic_request_failure(cmd, |
678 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE); | |
35e0e757 CH |
679 | } |
680 | ||
6138ed2a | 681 | /* |
d5829eac PB |
682 | * Used when asking transport to copy Sense Data from the underlying |
683 | * Linux/SCSI struct scsi_cmnd | |
6138ed2a | 684 | */ |
d5829eac | 685 | static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd) |
6138ed2a | 686 | { |
6138ed2a | 687 | struct se_device *dev = cmd->se_dev; |
6138ed2a PB |
688 | |
689 | WARN_ON(!cmd->se_lun); | |
690 | ||
691 | if (!dev) | |
d5829eac | 692 | return NULL; |
6138ed2a | 693 | |
d5829eac PB |
694 | if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) |
695 | return NULL; | |
6138ed2a | 696 | |
9c58b7dd | 697 | cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER; |
6138ed2a | 698 | |
d5829eac | 699 | pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n", |
6138ed2a | 700 | dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status); |
9c58b7dd | 701 | return cmd->sense_buffer; |
6138ed2a PB |
702 | } |
703 | ||
5787cacd | 704 | void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status) |
c66ac9db | 705 | { |
42bf829e | 706 | struct se_device *dev = cmd->se_dev; |
5787cacd | 707 | int success = scsi_status == GOOD; |
c66ac9db | 708 | unsigned long flags; |
c66ac9db | 709 | |
5787cacd CH |
710 | cmd->scsi_status = scsi_status; |
711 | ||
712 | ||
a1d8b49a | 713 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 714 | |
c66ac9db | 715 | if (dev && dev->transport->transport_complete) { |
d5829eac PB |
716 | dev->transport->transport_complete(cmd, |
717 | cmd->t_data_sg, | |
718 | transport_get_sense_buffer(cmd)); | |
719 | if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) | |
c66ac9db | 720 | success = 1; |
c66ac9db NB |
721 | } |
722 | ||
3d28934a | 723 | /* |
125d0119 | 724 | * Check for case where an explicit ABORT_TASK has been received |
3d28934a NB |
725 | * and transport_wait_for_tasks() will be waiting for completion.. |
726 | */ | |
febe562c | 727 | if (cmd->transport_state & CMD_T_ABORTED || |
3d28934a NB |
728 | cmd->transport_state & CMD_T_STOP) { |
729 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
a95d6511 | 730 | complete_all(&cmd->t_transport_stop_comp); |
3d28934a | 731 | return; |
3dca1471 | 732 | } else if (!success) { |
35e0e757 | 733 | INIT_WORK(&cmd->work, target_complete_failure_work); |
c66ac9db | 734 | } else { |
35e0e757 | 735 | INIT_WORK(&cmd->work, target_complete_ok_work); |
c66ac9db | 736 | } |
35e0e757 | 737 | |
35e0e757 | 738 | cmd->t_state = TRANSPORT_COMPLETE; |
3d28934a | 739 | cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE); |
a1d8b49a | 740 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 741 | |
9095adaa | 742 | if (cmd->se_cmd_flags & SCF_USE_CPUID) |
fb3269ba | 743 | queue_work_on(cmd->cpuid, target_completion_wq, &cmd->work); |
9095adaa QT |
744 | else |
745 | queue_work(target_completion_wq, &cmd->work); | |
c66ac9db | 746 | } |
6bb35e00 CH |
747 | EXPORT_SYMBOL(target_complete_cmd); |
748 | ||
2426bd45 RD |
749 | void target_complete_cmd_with_length(struct se_cmd *cmd, u8 scsi_status, int length) |
750 | { | |
61f36166 | 751 | if (scsi_status == SAM_STAT_GOOD && length < cmd->data_length) { |
2426bd45 RD |
752 | if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) { |
753 | cmd->residual_count += cmd->data_length - length; | |
754 | } else { | |
755 | cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT; | |
756 | cmd->residual_count = cmd->data_length - length; | |
757 | } | |
758 | ||
759 | cmd->data_length = length; | |
760 | } | |
761 | ||
762 | target_complete_cmd(cmd, scsi_status); | |
763 | } | |
764 | EXPORT_SYMBOL(target_complete_cmd_with_length); | |
765 | ||
cf572a96 | 766 | static void target_add_to_state_list(struct se_cmd *cmd) |
c66ac9db | 767 | { |
cf572a96 CH |
768 | struct se_device *dev = cmd->se_dev; |
769 | unsigned long flags; | |
c66ac9db | 770 | |
cf572a96 CH |
771 | spin_lock_irqsave(&dev->execute_task_lock, flags); |
772 | if (!cmd->state_active) { | |
773 | list_add_tail(&cmd->state_list, &dev->state_list); | |
774 | cmd->state_active = true; | |
c66ac9db | 775 | } |
cf572a96 | 776 | spin_unlock_irqrestore(&dev->execute_task_lock, flags); |
c66ac9db NB |
777 | } |
778 | ||
07bde79a | 779 | /* |
f147abb4 | 780 | * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status |
07bde79a | 781 | */ |
7a6f0a1e CH |
782 | static void transport_write_pending_qf(struct se_cmd *cmd); |
783 | static void transport_complete_qf(struct se_cmd *cmd); | |
07bde79a | 784 | |
0fd97ccf | 785 | void target_qf_do_work(struct work_struct *work) |
07bde79a NB |
786 | { |
787 | struct se_device *dev = container_of(work, struct se_device, | |
788 | qf_work_queue); | |
bcac364a | 789 | LIST_HEAD(qf_cmd_list); |
07bde79a NB |
790 | struct se_cmd *cmd, *cmd_tmp; |
791 | ||
792 | spin_lock_irq(&dev->qf_cmd_lock); | |
bcac364a RD |
793 | list_splice_init(&dev->qf_cmd_list, &qf_cmd_list); |
794 | spin_unlock_irq(&dev->qf_cmd_lock); | |
07bde79a | 795 | |
bcac364a | 796 | list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) { |
07bde79a | 797 | list_del(&cmd->se_qf_node); |
33940d09 | 798 | atomic_dec_mb(&dev->dev_qf_count); |
07bde79a | 799 | |
6708bb27 | 800 | pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue" |
07bde79a | 801 | " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd, |
e057f533 | 802 | (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" : |
07bde79a NB |
803 | (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING" |
804 | : "UNKNOWN"); | |
f7a5cc0b | 805 | |
7a6f0a1e CH |
806 | if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) |
807 | transport_write_pending_qf(cmd); | |
fa7e25cf NB |
808 | else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK || |
809 | cmd->t_state == TRANSPORT_COMPLETE_QF_ERR) | |
7a6f0a1e | 810 | transport_complete_qf(cmd); |
07bde79a | 811 | } |
07bde79a NB |
812 | } |
813 | ||
c66ac9db NB |
814 | unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd) |
815 | { | |
816 | switch (cmd->data_direction) { | |
817 | case DMA_NONE: | |
818 | return "NONE"; | |
819 | case DMA_FROM_DEVICE: | |
820 | return "READ"; | |
821 | case DMA_TO_DEVICE: | |
822 | return "WRITE"; | |
823 | case DMA_BIDIRECTIONAL: | |
824 | return "BIDI"; | |
825 | default: | |
826 | break; | |
827 | } | |
828 | ||
829 | return "UNKNOWN"; | |
830 | } | |
831 | ||
832 | void transport_dump_dev_state( | |
833 | struct se_device *dev, | |
834 | char *b, | |
835 | int *bl) | |
836 | { | |
837 | *bl += sprintf(b + *bl, "Status: "); | |
0fd97ccf | 838 | if (dev->export_count) |
c66ac9db | 839 | *bl += sprintf(b + *bl, "ACTIVATED"); |
0fd97ccf | 840 | else |
c66ac9db | 841 | *bl += sprintf(b + *bl, "DEACTIVATED"); |
c66ac9db | 842 | |
5f41a31d | 843 | *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth); |
11e764bd | 844 | *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n", |
0fd97ccf CH |
845 | dev->dev_attrib.block_size, |
846 | dev->dev_attrib.hw_max_sectors); | |
c66ac9db NB |
847 | *bl += sprintf(b + *bl, " "); |
848 | } | |
849 | ||
c66ac9db NB |
850 | void transport_dump_vpd_proto_id( |
851 | struct t10_vpd *vpd, | |
852 | unsigned char *p_buf, | |
853 | int p_buf_len) | |
854 | { | |
855 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
856 | int len; | |
857 | ||
858 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
859 | len = sprintf(buf, "T10 VPD Protocol Identifier: "); | |
860 | ||
861 | switch (vpd->protocol_identifier) { | |
862 | case 0x00: | |
863 | sprintf(buf+len, "Fibre Channel\n"); | |
864 | break; | |
865 | case 0x10: | |
866 | sprintf(buf+len, "Parallel SCSI\n"); | |
867 | break; | |
868 | case 0x20: | |
869 | sprintf(buf+len, "SSA\n"); | |
870 | break; | |
871 | case 0x30: | |
872 | sprintf(buf+len, "IEEE 1394\n"); | |
873 | break; | |
874 | case 0x40: | |
875 | sprintf(buf+len, "SCSI Remote Direct Memory Access" | |
876 | " Protocol\n"); | |
877 | break; | |
878 | case 0x50: | |
879 | sprintf(buf+len, "Internet SCSI (iSCSI)\n"); | |
880 | break; | |
881 | case 0x60: | |
882 | sprintf(buf+len, "SAS Serial SCSI Protocol\n"); | |
883 | break; | |
884 | case 0x70: | |
885 | sprintf(buf+len, "Automation/Drive Interface Transport" | |
886 | " Protocol\n"); | |
887 | break; | |
888 | case 0x80: | |
889 | sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n"); | |
890 | break; | |
891 | default: | |
892 | sprintf(buf+len, "Unknown 0x%02x\n", | |
893 | vpd->protocol_identifier); | |
894 | break; | |
895 | } | |
896 | ||
897 | if (p_buf) | |
898 | strncpy(p_buf, buf, p_buf_len); | |
899 | else | |
6708bb27 | 900 | pr_debug("%s", buf); |
c66ac9db NB |
901 | } |
902 | ||
903 | void | |
904 | transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83) | |
905 | { | |
906 | /* | |
907 | * Check if the Protocol Identifier Valid (PIV) bit is set.. | |
908 | * | |
909 | * from spc3r23.pdf section 7.5.1 | |
910 | */ | |
911 | if (page_83[1] & 0x80) { | |
912 | vpd->protocol_identifier = (page_83[0] & 0xf0); | |
913 | vpd->protocol_identifier_set = 1; | |
914 | transport_dump_vpd_proto_id(vpd, NULL, 0); | |
915 | } | |
916 | } | |
917 | EXPORT_SYMBOL(transport_set_vpd_proto_id); | |
918 | ||
919 | int transport_dump_vpd_assoc( | |
920 | struct t10_vpd *vpd, | |
921 | unsigned char *p_buf, | |
922 | int p_buf_len) | |
923 | { | |
924 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
e3d6f909 AG |
925 | int ret = 0; |
926 | int len; | |
c66ac9db NB |
927 | |
928 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
929 | len = sprintf(buf, "T10 VPD Identifier Association: "); | |
930 | ||
931 | switch (vpd->association) { | |
932 | case 0x00: | |
933 | sprintf(buf+len, "addressed logical unit\n"); | |
934 | break; | |
935 | case 0x10: | |
936 | sprintf(buf+len, "target port\n"); | |
937 | break; | |
938 | case 0x20: | |
939 | sprintf(buf+len, "SCSI target device\n"); | |
940 | break; | |
941 | default: | |
942 | sprintf(buf+len, "Unknown 0x%02x\n", vpd->association); | |
e3d6f909 | 943 | ret = -EINVAL; |
c66ac9db NB |
944 | break; |
945 | } | |
946 | ||
947 | if (p_buf) | |
948 | strncpy(p_buf, buf, p_buf_len); | |
949 | else | |
6708bb27 | 950 | pr_debug("%s", buf); |
c66ac9db NB |
951 | |
952 | return ret; | |
953 | } | |
954 | ||
955 | int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83) | |
956 | { | |
957 | /* | |
958 | * The VPD identification association.. | |
959 | * | |
960 | * from spc3r23.pdf Section 7.6.3.1 Table 297 | |
961 | */ | |
962 | vpd->association = (page_83[1] & 0x30); | |
963 | return transport_dump_vpd_assoc(vpd, NULL, 0); | |
964 | } | |
965 | EXPORT_SYMBOL(transport_set_vpd_assoc); | |
966 | ||
967 | int transport_dump_vpd_ident_type( | |
968 | struct t10_vpd *vpd, | |
969 | unsigned char *p_buf, | |
970 | int p_buf_len) | |
971 | { | |
972 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
e3d6f909 AG |
973 | int ret = 0; |
974 | int len; | |
c66ac9db NB |
975 | |
976 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
977 | len = sprintf(buf, "T10 VPD Identifier Type: "); | |
978 | ||
979 | switch (vpd->device_identifier_type) { | |
980 | case 0x00: | |
981 | sprintf(buf+len, "Vendor specific\n"); | |
982 | break; | |
983 | case 0x01: | |
984 | sprintf(buf+len, "T10 Vendor ID based\n"); | |
985 | break; | |
986 | case 0x02: | |
987 | sprintf(buf+len, "EUI-64 based\n"); | |
988 | break; | |
989 | case 0x03: | |
990 | sprintf(buf+len, "NAA\n"); | |
991 | break; | |
992 | case 0x04: | |
993 | sprintf(buf+len, "Relative target port identifier\n"); | |
994 | break; | |
995 | case 0x08: | |
996 | sprintf(buf+len, "SCSI name string\n"); | |
997 | break; | |
998 | default: | |
999 | sprintf(buf+len, "Unsupported: 0x%02x\n", | |
1000 | vpd->device_identifier_type); | |
e3d6f909 | 1001 | ret = -EINVAL; |
c66ac9db NB |
1002 | break; |
1003 | } | |
1004 | ||
e3d6f909 AG |
1005 | if (p_buf) { |
1006 | if (p_buf_len < strlen(buf)+1) | |
1007 | return -EINVAL; | |
c66ac9db | 1008 | strncpy(p_buf, buf, p_buf_len); |
e3d6f909 | 1009 | } else { |
6708bb27 | 1010 | pr_debug("%s", buf); |
e3d6f909 | 1011 | } |
c66ac9db NB |
1012 | |
1013 | return ret; | |
1014 | } | |
1015 | ||
1016 | int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83) | |
1017 | { | |
1018 | /* | |
1019 | * The VPD identifier type.. | |
1020 | * | |
1021 | * from spc3r23.pdf Section 7.6.3.1 Table 298 | |
1022 | */ | |
1023 | vpd->device_identifier_type = (page_83[1] & 0x0f); | |
1024 | return transport_dump_vpd_ident_type(vpd, NULL, 0); | |
1025 | } | |
1026 | EXPORT_SYMBOL(transport_set_vpd_ident_type); | |
1027 | ||
1028 | int transport_dump_vpd_ident( | |
1029 | struct t10_vpd *vpd, | |
1030 | unsigned char *p_buf, | |
1031 | int p_buf_len) | |
1032 | { | |
1033 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
1034 | int ret = 0; | |
1035 | ||
1036 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
1037 | ||
1038 | switch (vpd->device_identifier_code_set) { | |
1039 | case 0x01: /* Binary */ | |
703d641d DC |
1040 | snprintf(buf, sizeof(buf), |
1041 | "T10 VPD Binary Device Identifier: %s\n", | |
c66ac9db NB |
1042 | &vpd->device_identifier[0]); |
1043 | break; | |
1044 | case 0x02: /* ASCII */ | |
703d641d DC |
1045 | snprintf(buf, sizeof(buf), |
1046 | "T10 VPD ASCII Device Identifier: %s\n", | |
c66ac9db NB |
1047 | &vpd->device_identifier[0]); |
1048 | break; | |
1049 | case 0x03: /* UTF-8 */ | |
703d641d DC |
1050 | snprintf(buf, sizeof(buf), |
1051 | "T10 VPD UTF-8 Device Identifier: %s\n", | |
c66ac9db NB |
1052 | &vpd->device_identifier[0]); |
1053 | break; | |
1054 | default: | |
1055 | sprintf(buf, "T10 VPD Device Identifier encoding unsupported:" | |
1056 | " 0x%02x", vpd->device_identifier_code_set); | |
e3d6f909 | 1057 | ret = -EINVAL; |
c66ac9db NB |
1058 | break; |
1059 | } | |
1060 | ||
1061 | if (p_buf) | |
1062 | strncpy(p_buf, buf, p_buf_len); | |
1063 | else | |
6708bb27 | 1064 | pr_debug("%s", buf); |
c66ac9db NB |
1065 | |
1066 | return ret; | |
1067 | } | |
1068 | ||
1069 | int | |
1070 | transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83) | |
1071 | { | |
1072 | static const char hex_str[] = "0123456789abcdef"; | |
35d1efe8 | 1073 | int j = 0, i = 4; /* offset to start of the identifier */ |
c66ac9db NB |
1074 | |
1075 | /* | |
1076 | * The VPD Code Set (encoding) | |
1077 | * | |
1078 | * from spc3r23.pdf Section 7.6.3.1 Table 296 | |
1079 | */ | |
1080 | vpd->device_identifier_code_set = (page_83[0] & 0x0f); | |
1081 | switch (vpd->device_identifier_code_set) { | |
1082 | case 0x01: /* Binary */ | |
1083 | vpd->device_identifier[j++] = | |
1084 | hex_str[vpd->device_identifier_type]; | |
1085 | while (i < (4 + page_83[3])) { | |
1086 | vpd->device_identifier[j++] = | |
1087 | hex_str[(page_83[i] & 0xf0) >> 4]; | |
1088 | vpd->device_identifier[j++] = | |
1089 | hex_str[page_83[i] & 0x0f]; | |
1090 | i++; | |
1091 | } | |
1092 | break; | |
1093 | case 0x02: /* ASCII */ | |
1094 | case 0x03: /* UTF-8 */ | |
1095 | while (i < (4 + page_83[3])) | |
1096 | vpd->device_identifier[j++] = page_83[i++]; | |
1097 | break; | |
1098 | default: | |
1099 | break; | |
1100 | } | |
1101 | ||
1102 | return transport_dump_vpd_ident(vpd, NULL, 0); | |
1103 | } | |
1104 | EXPORT_SYMBOL(transport_set_vpd_ident); | |
1105 | ||
8f9b5654 NB |
1106 | static sense_reason_t |
1107 | target_check_max_data_sg_nents(struct se_cmd *cmd, struct se_device *dev, | |
1108 | unsigned int size) | |
1109 | { | |
1110 | u32 mtl; | |
1111 | ||
1112 | if (!cmd->se_tfo->max_data_sg_nents) | |
1113 | return TCM_NO_SENSE; | |
1114 | /* | |
1115 | * Check if fabric enforced maximum SGL entries per I/O descriptor | |
1116 | * exceeds se_cmd->data_length. If true, set SCF_UNDERFLOW_BIT + | |
1117 | * residual_count and reduce original cmd->data_length to maximum | |
1118 | * length based on single PAGE_SIZE entry scatter-lists. | |
1119 | */ | |
1120 | mtl = (cmd->se_tfo->max_data_sg_nents * PAGE_SIZE); | |
1121 | if (cmd->data_length > mtl) { | |
1122 | /* | |
1123 | * If an existing CDB overflow is present, calculate new residual | |
1124 | * based on CDB size minus fabric maximum transfer length. | |
1125 | * | |
1126 | * If an existing CDB underflow is present, calculate new residual | |
1127 | * based on original cmd->data_length minus fabric maximum transfer | |
1128 | * length. | |
1129 | * | |
1130 | * Otherwise, set the underflow residual based on cmd->data_length | |
1131 | * minus fabric maximum transfer length. | |
1132 | */ | |
1133 | if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) { | |
1134 | cmd->residual_count = (size - mtl); | |
1135 | } else if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) { | |
1136 | u32 orig_dl = size + cmd->residual_count; | |
1137 | cmd->residual_count = (orig_dl - mtl); | |
1138 | } else { | |
1139 | cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT; | |
1140 | cmd->residual_count = (cmd->data_length - mtl); | |
1141 | } | |
1142 | cmd->data_length = mtl; | |
1143 | /* | |
1144 | * Reset sbc_check_prot() calculated protection payload | |
1145 | * length based upon the new smaller MTL. | |
1146 | */ | |
1147 | if (cmd->prot_length) { | |
1148 | u32 sectors = (mtl / dev->dev_attrib.block_size); | |
1149 | cmd->prot_length = dev->prot_length * sectors; | |
1150 | } | |
1151 | } | |
1152 | return TCM_NO_SENSE; | |
1153 | } | |
1154 | ||
de103c93 CH |
1155 | sense_reason_t |
1156 | target_cmd_size_check(struct se_cmd *cmd, unsigned int size) | |
9b3b8041 CH |
1157 | { |
1158 | struct se_device *dev = cmd->se_dev; | |
1159 | ||
1160 | if (cmd->unknown_data_length) { | |
1161 | cmd->data_length = size; | |
1162 | } else if (size != cmd->data_length) { | |
1163 | pr_warn("TARGET_CORE[%s]: Expected Transfer Length:" | |
1164 | " %u does not match SCSI CDB Length: %u for SAM Opcode:" | |
1165 | " 0x%02x\n", cmd->se_tfo->get_fabric_name(), | |
1166 | cmd->data_length, size, cmd->t_task_cdb[0]); | |
1167 | ||
c72c5250 RD |
1168 | if (cmd->data_direction == DMA_TO_DEVICE && |
1169 | cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) { | |
1170 | pr_err("Rejecting underflow/overflow WRITE data\n"); | |
de103c93 | 1171 | return TCM_INVALID_CDB_FIELD; |
9b3b8041 CH |
1172 | } |
1173 | /* | |
1174 | * Reject READ_* or WRITE_* with overflow/underflow for | |
1175 | * type SCF_SCSI_DATA_CDB. | |
1176 | */ | |
0fd97ccf | 1177 | if (dev->dev_attrib.block_size != 512) { |
9b3b8041 CH |
1178 | pr_err("Failing OVERFLOW/UNDERFLOW for LBA op" |
1179 | " CDB on non 512-byte sector setup subsystem" | |
1180 | " plugin: %s\n", dev->transport->name); | |
1181 | /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */ | |
de103c93 | 1182 | return TCM_INVALID_CDB_FIELD; |
9b3b8041 | 1183 | } |
4c054ba6 NB |
1184 | /* |
1185 | * For the overflow case keep the existing fabric provided | |
1186 | * ->data_length. Otherwise for the underflow case, reset | |
1187 | * ->data_length to the smaller SCSI expected data transfer | |
1188 | * length. | |
1189 | */ | |
9b3b8041 CH |
1190 | if (size > cmd->data_length) { |
1191 | cmd->se_cmd_flags |= SCF_OVERFLOW_BIT; | |
1192 | cmd->residual_count = (size - cmd->data_length); | |
1193 | } else { | |
1194 | cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT; | |
1195 | cmd->residual_count = (cmd->data_length - size); | |
4c054ba6 | 1196 | cmd->data_length = size; |
9b3b8041 | 1197 | } |
9b3b8041 CH |
1198 | } |
1199 | ||
8f9b5654 | 1200 | return target_check_max_data_sg_nents(cmd, dev, size); |
9b3b8041 | 1201 | |
9b3b8041 CH |
1202 | } |
1203 | ||
c66ac9db NB |
1204 | /* |
1205 | * Used by fabric modules containing a local struct se_cmd within their | |
1206 | * fabric dependent per I/O descriptor. | |
649ee054 BVA |
1207 | * |
1208 | * Preserves the value of @cmd->tag. | |
c66ac9db NB |
1209 | */ |
1210 | void transport_init_se_cmd( | |
1211 | struct se_cmd *cmd, | |
9ac8928e | 1212 | const struct target_core_fabric_ops *tfo, |
c66ac9db NB |
1213 | struct se_session *se_sess, |
1214 | u32 data_length, | |
1215 | int data_direction, | |
1216 | int task_attr, | |
1217 | unsigned char *sense_buffer) | |
1218 | { | |
5951146d | 1219 | INIT_LIST_HEAD(&cmd->se_delayed_node); |
07bde79a | 1220 | INIT_LIST_HEAD(&cmd->se_qf_node); |
a17f091d | 1221 | INIT_LIST_HEAD(&cmd->se_cmd_list); |
cf572a96 | 1222 | INIT_LIST_HEAD(&cmd->state_list); |
a1d8b49a | 1223 | init_completion(&cmd->t_transport_stop_comp); |
a17f091d | 1224 | init_completion(&cmd->cmd_wait_comp); |
a1d8b49a | 1225 | spin_lock_init(&cmd->t_state_lock); |
1e1110c4 | 1226 | kref_init(&cmd->cmd_kref); |
c66ac9db NB |
1227 | |
1228 | cmd->se_tfo = tfo; | |
1229 | cmd->se_sess = se_sess; | |
1230 | cmd->data_length = data_length; | |
1231 | cmd->data_direction = data_direction; | |
1232 | cmd->sam_task_attr = task_attr; | |
1233 | cmd->sense_buffer = sense_buffer; | |
cf572a96 CH |
1234 | |
1235 | cmd->state_active = false; | |
c66ac9db NB |
1236 | } |
1237 | EXPORT_SYMBOL(transport_init_se_cmd); | |
1238 | ||
de103c93 CH |
1239 | static sense_reason_t |
1240 | transport_check_alloc_task_attr(struct se_cmd *cmd) | |
c66ac9db | 1241 | { |
019c4ca6 CH |
1242 | struct se_device *dev = cmd->se_dev; |
1243 | ||
c66ac9db NB |
1244 | /* |
1245 | * Check if SAM Task Attribute emulation is enabled for this | |
1246 | * struct se_device storage object | |
1247 | */ | |
a3541703 | 1248 | if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH) |
c66ac9db NB |
1249 | return 0; |
1250 | ||
68d81f40 | 1251 | if (cmd->sam_task_attr == TCM_ACA_TAG) { |
6708bb27 | 1252 | pr_debug("SAM Task Attribute ACA" |
c66ac9db | 1253 | " emulation is not supported\n"); |
de103c93 | 1254 | return TCM_INVALID_CDB_FIELD; |
c66ac9db | 1255 | } |
9c31820b | 1256 | |
c66ac9db NB |
1257 | return 0; |
1258 | } | |
1259 | ||
de103c93 CH |
1260 | sense_reason_t |
1261 | target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb) | |
c66ac9db | 1262 | { |
0fd97ccf | 1263 | struct se_device *dev = cmd->se_dev; |
de103c93 | 1264 | sense_reason_t ret; |
c66ac9db | 1265 | |
c66ac9db NB |
1266 | /* |
1267 | * Ensure that the received CDB is less than the max (252 + 8) bytes | |
1268 | * for VARIABLE_LENGTH_CMD | |
1269 | */ | |
1270 | if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) { | |
6708bb27 | 1271 | pr_err("Received SCSI CDB with command_size: %d that" |
c66ac9db NB |
1272 | " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n", |
1273 | scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE); | |
de103c93 | 1274 | return TCM_INVALID_CDB_FIELD; |
c66ac9db NB |
1275 | } |
1276 | /* | |
1277 | * If the received CDB is larger than TCM_MAX_COMMAND_SIZE, | |
1278 | * allocate the additional extended CDB buffer now.. Otherwise | |
1279 | * setup the pointer from __t_task_cdb to t_task_cdb. | |
1280 | */ | |
a1d8b49a AG |
1281 | if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) { |
1282 | cmd->t_task_cdb = kzalloc(scsi_command_size(cdb), | |
c66ac9db | 1283 | GFP_KERNEL); |
6708bb27 AG |
1284 | if (!cmd->t_task_cdb) { |
1285 | pr_err("Unable to allocate cmd->t_task_cdb" | |
a1d8b49a | 1286 | " %u > sizeof(cmd->__t_task_cdb): %lu ops\n", |
c66ac9db | 1287 | scsi_command_size(cdb), |
a1d8b49a | 1288 | (unsigned long)sizeof(cmd->__t_task_cdb)); |
de103c93 | 1289 | return TCM_OUT_OF_RESOURCES; |
c66ac9db NB |
1290 | } |
1291 | } else | |
a1d8b49a | 1292 | cmd->t_task_cdb = &cmd->__t_task_cdb[0]; |
c66ac9db | 1293 | /* |
a1d8b49a | 1294 | * Copy the original CDB into cmd-> |
c66ac9db | 1295 | */ |
a1d8b49a | 1296 | memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb)); |
cb4f4d3c | 1297 | |
e5c0d6ad RD |
1298 | trace_target_sequencer_start(cmd); |
1299 | ||
0fd97ccf | 1300 | ret = dev->transport->parse_cdb(cmd); |
568e1f65 JE |
1301 | if (ret == TCM_UNSUPPORTED_SCSI_OPCODE) |
1302 | pr_warn_ratelimited("%s/%s: Unsupported SCSI Opcode 0x%02x, sending CHECK_CONDITION.\n", | |
1303 | cmd->se_tfo->get_fabric_name(), | |
1304 | cmd->se_sess->se_node_acl->initiatorname, | |
1305 | cmd->t_task_cdb[0]); | |
de103c93 CH |
1306 | if (ret) |
1307 | return ret; | |
1308 | ||
1309 | ret = transport_check_alloc_task_attr(cmd); | |
1310 | if (ret) | |
c66ac9db | 1311 | return ret; |
cb4f4d3c | 1312 | |
cb4f4d3c | 1313 | cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE; |
4cc987ea | 1314 | atomic_long_inc(&cmd->se_lun->lun_stats.cmd_pdus); |
c66ac9db NB |
1315 | return 0; |
1316 | } | |
a12f41f8 | 1317 | EXPORT_SYMBOL(target_setup_cmd_from_cdb); |
c66ac9db | 1318 | |
695434e1 NB |
1319 | /* |
1320 | * Used by fabric module frontends to queue tasks directly. | |
ac75d8be | 1321 | * May only be used from process context. |
695434e1 NB |
1322 | */ |
1323 | int transport_handle_cdb_direct( | |
1324 | struct se_cmd *cmd) | |
1325 | { | |
de103c93 | 1326 | sense_reason_t ret; |
dd8ae59d | 1327 | |
695434e1 NB |
1328 | if (!cmd->se_lun) { |
1329 | dump_stack(); | |
6708bb27 | 1330 | pr_err("cmd->se_lun is NULL\n"); |
695434e1 NB |
1331 | return -EINVAL; |
1332 | } | |
1333 | if (in_interrupt()) { | |
1334 | dump_stack(); | |
6708bb27 | 1335 | pr_err("transport_generic_handle_cdb cannot be called" |
695434e1 NB |
1336 | " from interrupt context\n"); |
1337 | return -EINVAL; | |
1338 | } | |
dd8ae59d | 1339 | /* |
af877292 CH |
1340 | * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that |
1341 | * outstanding descriptors are handled correctly during shutdown via | |
1342 | * transport_wait_for_tasks() | |
dd8ae59d NB |
1343 | * |
1344 | * Also, we don't take cmd->t_state_lock here as we only expect | |
1345 | * this to be called for initial descriptor submission. | |
1346 | */ | |
1347 | cmd->t_state = TRANSPORT_NEW_CMD; | |
7d680f3b CH |
1348 | cmd->transport_state |= CMD_T_ACTIVE; |
1349 | ||
dd8ae59d NB |
1350 | /* |
1351 | * transport_generic_new_cmd() is already handling QUEUE_FULL, | |
1352 | * so follow TRANSPORT_NEW_CMD processing thread context usage | |
1353 | * and call transport_generic_request_failure() if necessary.. | |
1354 | */ | |
1355 | ret = transport_generic_new_cmd(cmd); | |
de103c93 CH |
1356 | if (ret) |
1357 | transport_generic_request_failure(cmd, ret); | |
dd8ae59d | 1358 | return 0; |
695434e1 NB |
1359 | } |
1360 | EXPORT_SYMBOL(transport_handle_cdb_direct); | |
1361 | ||
c5ff8d6b | 1362 | sense_reason_t |
de103c93 CH |
1363 | transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl, |
1364 | u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count) | |
1365 | { | |
1366 | if (!sgl || !sgl_count) | |
1367 | return 0; | |
1368 | ||
1369 | /* | |
1370 | * Reject SCSI data overflow with map_mem_to_cmd() as incoming | |
1371 | * scatterlists already have been set to follow what the fabric | |
1372 | * passes for the original expected data transfer length. | |
1373 | */ | |
1374 | if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) { | |
1375 | pr_warn("Rejecting SCSI DATA overflow for fabric using" | |
1376 | " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n"); | |
1377 | return TCM_INVALID_CDB_FIELD; | |
1378 | } | |
1379 | ||
1380 | cmd->t_data_sg = sgl; | |
1381 | cmd->t_data_nents = sgl_count; | |
b32bd0a8 IT |
1382 | cmd->t_bidi_data_sg = sgl_bidi; |
1383 | cmd->t_bidi_data_nents = sgl_bidi_count; | |
de103c93 | 1384 | |
de103c93 CH |
1385 | cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC; |
1386 | return 0; | |
1387 | } | |
1388 | ||
a026757f NB |
1389 | /* |
1390 | * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized | |
1391 | * se_cmd + use pre-allocated SGL memory. | |
a6360785 NB |
1392 | * |
1393 | * @se_cmd: command descriptor to submit | |
1394 | * @se_sess: associated se_sess for endpoint | |
1395 | * @cdb: pointer to SCSI CDB | |
1396 | * @sense: pointer to SCSI sense buffer | |
1397 | * @unpacked_lun: unpacked LUN to reference for struct se_lun | |
1398 | * @data_length: fabric expected data transfer length | |
1399 | * @task_addr: SAM task attribute | |
1400 | * @data_dir: DMA data direction | |
1401 | * @flags: flags for command submission from target_sc_flags_tables | |
a026757f NB |
1402 | * @sgl: struct scatterlist memory for unidirectional mapping |
1403 | * @sgl_count: scatterlist count for unidirectional mapping | |
1404 | * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping | |
1405 | * @sgl_bidi_count: scatterlist count for bidirectional READ mapping | |
def2b339 NB |
1406 | * @sgl_prot: struct scatterlist memory protection information |
1407 | * @sgl_prot_count: scatterlist count for protection information | |
a6360785 | 1408 | * |
649ee054 BVA |
1409 | * Task tags are supported if the caller has set @se_cmd->tag. |
1410 | * | |
d6dfc868 RD |
1411 | * Returns non zero to signal active I/O shutdown failure. All other |
1412 | * setup exceptions will be returned as a SCSI CHECK_CONDITION response, | |
1413 | * but still return zero here. | |
1414 | * | |
a6360785 NB |
1415 | * This may only be called from process context, and also currently |
1416 | * assumes internal allocation of fabric payload buffer by target-core. | |
a026757f NB |
1417 | */ |
1418 | int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess, | |
f2d30680 | 1419 | unsigned char *cdb, unsigned char *sense, u64 unpacked_lun, |
a026757f NB |
1420 | u32 data_length, int task_attr, int data_dir, int flags, |
1421 | struct scatterlist *sgl, u32 sgl_count, | |
def2b339 NB |
1422 | struct scatterlist *sgl_bidi, u32 sgl_bidi_count, |
1423 | struct scatterlist *sgl_prot, u32 sgl_prot_count) | |
a6360785 NB |
1424 | { |
1425 | struct se_portal_group *se_tpg; | |
de103c93 CH |
1426 | sense_reason_t rc; |
1427 | int ret; | |
a6360785 NB |
1428 | |
1429 | se_tpg = se_sess->se_tpg; | |
1430 | BUG_ON(!se_tpg); | |
1431 | BUG_ON(se_cmd->se_tfo || se_cmd->se_sess); | |
1432 | BUG_ON(in_interrupt()); | |
1433 | /* | |
1434 | * Initialize se_cmd for target operation. From this point | |
1435 | * exceptions are handled by sending exception status via | |
1436 | * target_core_fabric_ops->queue_status() callback | |
1437 | */ | |
1438 | transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, | |
1439 | data_length, data_dir, task_attr, sense); | |
9095adaa QT |
1440 | |
1441 | if (flags & TARGET_SCF_USE_CPUID) | |
1442 | se_cmd->se_cmd_flags |= SCF_USE_CPUID; | |
1443 | else | |
1444 | se_cmd->cpuid = WORK_CPU_UNBOUND; | |
1445 | ||
b0d79946 SAS |
1446 | if (flags & TARGET_SCF_UNKNOWN_SIZE) |
1447 | se_cmd->unknown_data_length = 1; | |
a6360785 NB |
1448 | /* |
1449 | * Obtain struct se_cmd->cmd_kref reference and add new cmd to | |
1450 | * se_sess->sess_cmd_list. A second kref_get here is necessary | |
1451 | * for fabrics using TARGET_SCF_ACK_KREF that expect a second | |
1452 | * kref_put() to happen during fabric packet acknowledgement. | |
1453 | */ | |
afc16604 | 1454 | ret = target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF); |
de103c93 CH |
1455 | if (ret) |
1456 | return ret; | |
a6360785 NB |
1457 | /* |
1458 | * Signal bidirectional data payloads to target-core | |
1459 | */ | |
1460 | if (flags & TARGET_SCF_BIDI_OP) | |
1461 | se_cmd->se_cmd_flags |= SCF_BIDI; | |
1462 | /* | |
1463 | * Locate se_lun pointer and attach it to struct se_cmd | |
1464 | */ | |
de103c93 CH |
1465 | rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun); |
1466 | if (rc) { | |
1467 | transport_send_check_condition_and_sense(se_cmd, rc, 0); | |
afc16604 | 1468 | target_put_sess_cmd(se_cmd); |
d6dfc868 | 1469 | return 0; |
735703ca | 1470 | } |
b5b8e298 SG |
1471 | |
1472 | rc = target_setup_cmd_from_cdb(se_cmd, cdb); | |
1473 | if (rc != 0) { | |
1474 | transport_generic_request_failure(se_cmd, rc); | |
1475 | return 0; | |
1476 | } | |
1477 | ||
def2b339 NB |
1478 | /* |
1479 | * Save pointers for SGLs containing protection information, | |
1480 | * if present. | |
1481 | */ | |
1482 | if (sgl_prot_count) { | |
1483 | se_cmd->t_prot_sg = sgl_prot; | |
1484 | se_cmd->t_prot_nents = sgl_prot_count; | |
5835812f | 1485 | se_cmd->se_cmd_flags |= SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC; |
def2b339 | 1486 | } |
d6e0175c | 1487 | |
a026757f NB |
1488 | /* |
1489 | * When a non zero sgl_count has been passed perform SGL passthrough | |
1490 | * mapping for pre-allocated fabric memory instead of having target | |
1491 | * core perform an internal SGL allocation.. | |
1492 | */ | |
1493 | if (sgl_count != 0) { | |
1494 | BUG_ON(!sgl); | |
1495 | ||
944981c7 NB |
1496 | /* |
1497 | * A work-around for tcm_loop as some userspace code via | |
1498 | * scsi-generic do not memset their associated read buffers, | |
1499 | * so go ahead and do that here for type non-data CDBs. Also | |
1500 | * note that this is currently guaranteed to be a single SGL | |
1501 | * for this case by target core in target_setup_cmd_from_cdb() | |
1502 | * -> transport_generic_cmd_sequencer(). | |
1503 | */ | |
1504 | if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) && | |
1505 | se_cmd->data_direction == DMA_FROM_DEVICE) { | |
1506 | unsigned char *buf = NULL; | |
1507 | ||
1508 | if (sgl) | |
1509 | buf = kmap(sg_page(sgl)) + sgl->offset; | |
1510 | ||
1511 | if (buf) { | |
1512 | memset(buf, 0, sgl->length); | |
1513 | kunmap(sg_page(sgl)); | |
1514 | } | |
1515 | } | |
1516 | ||
a026757f NB |
1517 | rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count, |
1518 | sgl_bidi, sgl_bidi_count); | |
1519 | if (rc != 0) { | |
de103c93 | 1520 | transport_generic_request_failure(se_cmd, rc); |
a026757f NB |
1521 | return 0; |
1522 | } | |
1523 | } | |
def2b339 | 1524 | |
11e319ed AG |
1525 | /* |
1526 | * Check if we need to delay processing because of ALUA | |
1527 | * Active/NonOptimized primary access state.. | |
1528 | */ | |
1529 | core_alua_check_nonop_delay(se_cmd); | |
1530 | ||
a6360785 | 1531 | transport_handle_cdb_direct(se_cmd); |
d6dfc868 | 1532 | return 0; |
a6360785 | 1533 | } |
a026757f NB |
1534 | EXPORT_SYMBOL(target_submit_cmd_map_sgls); |
1535 | ||
1536 | /* | |
1537 | * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd | |
1538 | * | |
1539 | * @se_cmd: command descriptor to submit | |
1540 | * @se_sess: associated se_sess for endpoint | |
1541 | * @cdb: pointer to SCSI CDB | |
1542 | * @sense: pointer to SCSI sense buffer | |
1543 | * @unpacked_lun: unpacked LUN to reference for struct se_lun | |
1544 | * @data_length: fabric expected data transfer length | |
1545 | * @task_addr: SAM task attribute | |
1546 | * @data_dir: DMA data direction | |
1547 | * @flags: flags for command submission from target_sc_flags_tables | |
1548 | * | |
649ee054 BVA |
1549 | * Task tags are supported if the caller has set @se_cmd->tag. |
1550 | * | |
a026757f NB |
1551 | * Returns non zero to signal active I/O shutdown failure. All other |
1552 | * setup exceptions will be returned as a SCSI CHECK_CONDITION response, | |
1553 | * but still return zero here. | |
1554 | * | |
1555 | * This may only be called from process context, and also currently | |
1556 | * assumes internal allocation of fabric payload buffer by target-core. | |
1557 | * | |
1558 | * It also assumes interal target core SGL memory allocation. | |
1559 | */ | |
1560 | int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess, | |
f2d30680 | 1561 | unsigned char *cdb, unsigned char *sense, u64 unpacked_lun, |
a026757f NB |
1562 | u32 data_length, int task_attr, int data_dir, int flags) |
1563 | { | |
1564 | return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense, | |
1565 | unpacked_lun, data_length, task_attr, data_dir, | |
def2b339 | 1566 | flags, NULL, 0, NULL, 0, NULL, 0); |
a026757f | 1567 | } |
a6360785 NB |
1568 | EXPORT_SYMBOL(target_submit_cmd); |
1569 | ||
9f0d05c2 NB |
1570 | static void target_complete_tmr_failure(struct work_struct *work) |
1571 | { | |
1572 | struct se_cmd *se_cmd = container_of(work, struct se_cmd, work); | |
1573 | ||
1574 | se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST; | |
1575 | se_cmd->se_tfo->queue_tm_rsp(se_cmd); | |
5a3b6fc0 RD |
1576 | |
1577 | transport_cmd_check_stop_to_fabric(se_cmd); | |
9f0d05c2 NB |
1578 | } |
1579 | ||
ea98d7f9 AG |
1580 | /** |
1581 | * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd | |
1582 | * for TMR CDBs | |
1583 | * | |
1584 | * @se_cmd: command descriptor to submit | |
1585 | * @se_sess: associated se_sess for endpoint | |
1586 | * @sense: pointer to SCSI sense buffer | |
1587 | * @unpacked_lun: unpacked LUN to reference for struct se_lun | |
1588 | * @fabric_context: fabric context for TMR req | |
1589 | * @tm_type: Type of TM request | |
c0974f89 NB |
1590 | * @gfp: gfp type for caller |
1591 | * @tag: referenced task tag for TMR_ABORT_TASK | |
c7042cae | 1592 | * @flags: submit cmd flags |
ea98d7f9 AG |
1593 | * |
1594 | * Callable from all contexts. | |
1595 | **/ | |
1596 | ||
c7042cae | 1597 | int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess, |
f2d30680 | 1598 | unsigned char *sense, u64 unpacked_lun, |
c0974f89 | 1599 | void *fabric_tmr_ptr, unsigned char tm_type, |
5261d86c | 1600 | gfp_t gfp, u64 tag, int flags) |
ea98d7f9 AG |
1601 | { |
1602 | struct se_portal_group *se_tpg; | |
1603 | int ret; | |
1604 | ||
1605 | se_tpg = se_sess->se_tpg; | |
1606 | BUG_ON(!se_tpg); | |
1607 | ||
1608 | transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, | |
68d81f40 | 1609 | 0, DMA_NONE, TCM_SIMPLE_TAG, sense); |
c7042cae NB |
1610 | /* |
1611 | * FIXME: Currently expect caller to handle se_cmd->se_tmr_req | |
1612 | * allocation failure. | |
1613 | */ | |
c0974f89 | 1614 | ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp); |
c7042cae NB |
1615 | if (ret < 0) |
1616 | return -ENOMEM; | |
ea98d7f9 | 1617 | |
c0974f89 NB |
1618 | if (tm_type == TMR_ABORT_TASK) |
1619 | se_cmd->se_tmr_req->ref_task_tag = tag; | |
1620 | ||
ea98d7f9 | 1621 | /* See target_submit_cmd for commentary */ |
afc16604 | 1622 | ret = target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF); |
bc187ea6 RD |
1623 | if (ret) { |
1624 | core_tmr_release_req(se_cmd->se_tmr_req); | |
1625 | return ret; | |
1626 | } | |
ea98d7f9 | 1627 | |
ea98d7f9 AG |
1628 | ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun); |
1629 | if (ret) { | |
9f0d05c2 NB |
1630 | /* |
1631 | * For callback during failure handling, push this work off | |
1632 | * to process context with TMR_LUN_DOES_NOT_EXIST status. | |
1633 | */ | |
1634 | INIT_WORK(&se_cmd->work, target_complete_tmr_failure); | |
1635 | schedule_work(&se_cmd->work); | |
c7042cae | 1636 | return 0; |
ea98d7f9 AG |
1637 | } |
1638 | transport_generic_handle_tmr(se_cmd); | |
c7042cae | 1639 | return 0; |
ea98d7f9 AG |
1640 | } |
1641 | EXPORT_SYMBOL(target_submit_tmr); | |
1642 | ||
c66ac9db NB |
1643 | /* |
1644 | * Handle SAM-esque emulation for generic transport request failures. | |
1645 | */ | |
de103c93 CH |
1646 | void transport_generic_request_failure(struct se_cmd *cmd, |
1647 | sense_reason_t sense_reason) | |
c66ac9db | 1648 | { |
057085e5 | 1649 | int ret = 0, post_ret = 0; |
07bde79a | 1650 | |
e3b88ee9 BVA |
1651 | if (transport_check_aborted_status(cmd, 1)) |
1652 | return; | |
1653 | ||
649ee054 BVA |
1654 | pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08llx" |
1655 | " CDB: 0x%02x\n", cmd, cmd->tag, cmd->t_task_cdb[0]); | |
de103c93 | 1656 | pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n", |
e3d6f909 | 1657 | cmd->se_tfo->get_cmd_state(cmd), |
de103c93 | 1658 | cmd->t_state, sense_reason); |
d43d6aea | 1659 | pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n", |
7d680f3b CH |
1660 | (cmd->transport_state & CMD_T_ACTIVE) != 0, |
1661 | (cmd->transport_state & CMD_T_STOP) != 0, | |
1662 | (cmd->transport_state & CMD_T_SENT) != 0); | |
c66ac9db | 1663 | |
c66ac9db NB |
1664 | /* |
1665 | * For SAM Task Attribute emulation for failed struct se_cmd | |
1666 | */ | |
019c4ca6 | 1667 | transport_complete_task_attr(cmd); |
cf6d1f09 NB |
1668 | /* |
1669 | * Handle special case for COMPARE_AND_WRITE failure, where the | |
c8e63985 | 1670 | * callback is expected to drop the per device ->caw_sem. |
cf6d1f09 NB |
1671 | */ |
1672 | if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) && | |
1673 | cmd->transport_complete_callback) | |
057085e5 | 1674 | cmd->transport_complete_callback(cmd, false, &post_ret); |
c66ac9db | 1675 | |
de103c93 | 1676 | switch (sense_reason) { |
03e98c9e NB |
1677 | case TCM_NON_EXISTENT_LUN: |
1678 | case TCM_UNSUPPORTED_SCSI_OPCODE: | |
1679 | case TCM_INVALID_CDB_FIELD: | |
1680 | case TCM_INVALID_PARAMETER_LIST: | |
bb992e72 | 1681 | case TCM_PARAMETER_LIST_LENGTH_ERROR: |
03e98c9e NB |
1682 | case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE: |
1683 | case TCM_UNKNOWN_MODE_PAGE: | |
1684 | case TCM_WRITE_PROTECTED: | |
e2397c70 | 1685 | case TCM_ADDRESS_OUT_OF_RANGE: |
03e98c9e NB |
1686 | case TCM_CHECK_CONDITION_ABORT_CMD: |
1687 | case TCM_CHECK_CONDITION_UNIT_ATTENTION: | |
1688 | case TCM_CHECK_CONDITION_NOT_READY: | |
94387aa7 NB |
1689 | case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED: |
1690 | case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED: | |
1691 | case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED: | |
449a1378 | 1692 | case TCM_COPY_TARGET_DEVICE_NOT_REACHABLE: |
e8642120 DD |
1693 | case TCM_TOO_MANY_TARGET_DESCS: |
1694 | case TCM_UNSUPPORTED_TARGET_DESC_TYPE_CODE: | |
1695 | case TCM_TOO_MANY_SEGMENT_DESCS: | |
1696 | case TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE: | |
c66ac9db | 1697 | break; |
de103c93 CH |
1698 | case TCM_OUT_OF_RESOURCES: |
1699 | sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
1700 | break; | |
03e98c9e | 1701 | case TCM_RESERVATION_CONFLICT: |
c66ac9db NB |
1702 | /* |
1703 | * No SENSE Data payload for this case, set SCSI Status | |
1704 | * and queue the response to $FABRIC_MOD. | |
1705 | * | |
1706 | * Uses linux/include/scsi/scsi.h SAM status codes defs | |
1707 | */ | |
1708 | cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT; | |
1709 | /* | |
1710 | * For UA Interlock Code 11b, a RESERVATION CONFLICT will | |
1711 | * establish a UNIT ATTENTION with PREVIOUS RESERVATION | |
1712 | * CONFLICT STATUS. | |
1713 | * | |
1714 | * See spc4r17, section 7.4.6 Control Mode Page, Table 349 | |
1715 | */ | |
e3d6f909 | 1716 | if (cmd->se_sess && |
c51c8e7b HR |
1717 | cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2) { |
1718 | target_ua_allocate_lun(cmd->se_sess->se_node_acl, | |
1719 | cmd->orig_fe_lun, 0x2C, | |
1720 | ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS); | |
1721 | } | |
e5c0d6ad | 1722 | trace_target_cmd_complete(cmd); |
c51c8e7b | 1723 | ret = cmd->se_tfo->queue_status(cmd); |
fa7e25cf | 1724 | if (ret) |
07bde79a | 1725 | goto queue_full; |
c66ac9db | 1726 | goto check_stop; |
c66ac9db | 1727 | default: |
6708bb27 | 1728 | pr_err("Unknown transport error for CDB 0x%02x: %d\n", |
de103c93 CH |
1729 | cmd->t_task_cdb[0], sense_reason); |
1730 | sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; | |
c66ac9db NB |
1731 | break; |
1732 | } | |
f3146437 | 1733 | |
de103c93 | 1734 | ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0); |
fa7e25cf | 1735 | if (ret) |
03e98c9e | 1736 | goto queue_full; |
07bde79a | 1737 | |
c66ac9db NB |
1738 | check_stop: |
1739 | transport_lun_remove_cmd(cmd); | |
06b967e4 | 1740 | transport_cmd_check_stop_to_fabric(cmd); |
07bde79a NB |
1741 | return; |
1742 | ||
1743 | queue_full: | |
fa7e25cf | 1744 | transport_handle_queue_full(cmd, cmd->se_dev, ret, false); |
c66ac9db | 1745 | } |
2fbff127 | 1746 | EXPORT_SYMBOL(transport_generic_request_failure); |
c66ac9db | 1747 | |
dff0ca9e | 1748 | void __target_execute_cmd(struct se_cmd *cmd, bool do_checks) |
c66ac9db | 1749 | { |
de103c93 | 1750 | sense_reason_t ret; |
5f41a31d | 1751 | |
dff0ca9e NB |
1752 | if (!cmd->execute_cmd) { |
1753 | ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
1754 | goto err; | |
1755 | } | |
1756 | if (do_checks) { | |
1757 | /* | |
1758 | * Check for an existing UNIT ATTENTION condition after | |
1759 | * target_handle_task_attr() has done SAM task attr | |
1760 | * checking, and possibly have already defered execution | |
1761 | * out to target_restart_delayed_cmds() context. | |
1762 | */ | |
1763 | ret = target_scsi3_ua_check(cmd); | |
1764 | if (ret) | |
1765 | goto err; | |
1766 | ||
1767 | ret = target_alua_state_check(cmd); | |
1768 | if (ret) | |
1769 | goto err; | |
5f41a31d | 1770 | |
dff0ca9e NB |
1771 | ret = target_check_reservation(cmd); |
1772 | if (ret) { | |
1773 | cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT; | |
1774 | goto err; | |
de103c93 | 1775 | } |
5f41a31d | 1776 | } |
dff0ca9e NB |
1777 | |
1778 | ret = cmd->execute_cmd(cmd); | |
1779 | if (!ret) | |
1780 | return; | |
1781 | err: | |
1782 | spin_lock_irq(&cmd->t_state_lock); | |
fd5e64de | 1783 | cmd->transport_state &= ~CMD_T_SENT; |
dff0ca9e NB |
1784 | spin_unlock_irq(&cmd->t_state_lock); |
1785 | ||
1786 | transport_generic_request_failure(cmd, ret); | |
5f41a31d CH |
1787 | } |
1788 | ||
aa58b531 NB |
1789 | static int target_write_prot_action(struct se_cmd *cmd) |
1790 | { | |
5132d1e6 | 1791 | u32 sectors; |
aa58b531 NB |
1792 | /* |
1793 | * Perform WRITE_INSERT of PI using software emulation when backend | |
1794 | * device has PI enabled, if the transport has not already generated | |
1795 | * PI using hardware WRITE_INSERT offload. | |
1796 | */ | |
1797 | switch (cmd->prot_op) { | |
1798 | case TARGET_PROT_DOUT_INSERT: | |
1799 | if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_INSERT)) | |
1800 | sbc_dif_generate(cmd); | |
1801 | break; | |
5132d1e6 NB |
1802 | case TARGET_PROT_DOUT_STRIP: |
1803 | if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_STRIP) | |
1804 | break; | |
1805 | ||
1806 | sectors = cmd->data_length >> ilog2(cmd->se_dev->dev_attrib.block_size); | |
f75b6fae SG |
1807 | cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba, |
1808 | sectors, 0, cmd->t_prot_sg, 0); | |
5132d1e6 NB |
1809 | if (unlikely(cmd->pi_err)) { |
1810 | spin_lock_irq(&cmd->t_state_lock); | |
fd5e64de | 1811 | cmd->transport_state &= ~CMD_T_SENT; |
5132d1e6 NB |
1812 | spin_unlock_irq(&cmd->t_state_lock); |
1813 | transport_generic_request_failure(cmd, cmd->pi_err); | |
1814 | return -1; | |
1815 | } | |
1816 | break; | |
aa58b531 NB |
1817 | default: |
1818 | break; | |
1819 | } | |
1820 | ||
1821 | return 0; | |
1822 | } | |
1823 | ||
019c4ca6 | 1824 | static bool target_handle_task_attr(struct se_cmd *cmd) |
5f41a31d CH |
1825 | { |
1826 | struct se_device *dev = cmd->se_dev; | |
1827 | ||
a3541703 | 1828 | if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH) |
019c4ca6 | 1829 | return false; |
5f41a31d | 1830 | |
410c29df NB |
1831 | cmd->se_cmd_flags |= SCF_TASK_ATTR_SET; |
1832 | ||
c66ac9db | 1833 | /* |
25985edc | 1834 | * Check for the existence of HEAD_OF_QUEUE, and if true return 1 |
c66ac9db NB |
1835 | * to allow the passed struct se_cmd list of tasks to the front of the list. |
1836 | */ | |
5f41a31d | 1837 | switch (cmd->sam_task_attr) { |
68d81f40 | 1838 | case TCM_HEAD_TAG: |
9c31820b RD |
1839 | pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x\n", |
1840 | cmd->t_task_cdb[0]); | |
019c4ca6 | 1841 | return false; |
68d81f40 | 1842 | case TCM_ORDERED_TAG: |
33940d09 | 1843 | atomic_inc_mb(&dev->dev_ordered_sync); |
c66ac9db | 1844 | |
9c31820b RD |
1845 | pr_debug("Added ORDERED for CDB: 0x%02x to ordered list\n", |
1846 | cmd->t_task_cdb[0]); | |
5f41a31d | 1847 | |
c66ac9db | 1848 | /* |
5f41a31d CH |
1849 | * Execute an ORDERED command if no other older commands |
1850 | * exist that need to be completed first. | |
c66ac9db | 1851 | */ |
5f41a31d | 1852 | if (!atomic_read(&dev->simple_cmds)) |
019c4ca6 | 1853 | return false; |
5f41a31d CH |
1854 | break; |
1855 | default: | |
c66ac9db NB |
1856 | /* |
1857 | * For SIMPLE and UNTAGGED Task Attribute commands | |
1858 | */ | |
33940d09 | 1859 | atomic_inc_mb(&dev->simple_cmds); |
5f41a31d | 1860 | break; |
c66ac9db | 1861 | } |
5f41a31d | 1862 | |
019c4ca6 CH |
1863 | if (atomic_read(&dev->dev_ordered_sync) == 0) |
1864 | return false; | |
c66ac9db | 1865 | |
019c4ca6 CH |
1866 | spin_lock(&dev->delayed_cmd_lock); |
1867 | list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list); | |
1868 | spin_unlock(&dev->delayed_cmd_lock); | |
1869 | ||
9c31820b RD |
1870 | pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to delayed CMD listn", |
1871 | cmd->t_task_cdb[0], cmd->sam_task_attr); | |
019c4ca6 CH |
1872 | return true; |
1873 | } | |
1874 | ||
310d3d31 NB |
1875 | static int __transport_check_aborted_status(struct se_cmd *, int); |
1876 | ||
019c4ca6 CH |
1877 | void target_execute_cmd(struct se_cmd *cmd) |
1878 | { | |
019c4ca6 CH |
1879 | /* |
1880 | * Determine if frontend context caller is requesting the stopping of | |
1881 | * this command for frontend exceptions. | |
310d3d31 NB |
1882 | * |
1883 | * If the received CDB has aleady been aborted stop processing it here. | |
019c4ca6 | 1884 | */ |
4a9a6c8d | 1885 | spin_lock_irq(&cmd->t_state_lock); |
310d3d31 NB |
1886 | if (__transport_check_aborted_status(cmd, 1)) { |
1887 | spin_unlock_irq(&cmd->t_state_lock); | |
1888 | return; | |
1889 | } | |
019c4ca6 | 1890 | if (cmd->transport_state & CMD_T_STOP) { |
649ee054 BVA |
1891 | pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n", |
1892 | __func__, __LINE__, cmd->tag); | |
019c4ca6 CH |
1893 | |
1894 | spin_unlock_irq(&cmd->t_state_lock); | |
a95d6511 | 1895 | complete_all(&cmd->t_transport_stop_comp); |
019c4ca6 CH |
1896 | return; |
1897 | } | |
1898 | ||
1899 | cmd->t_state = TRANSPORT_PROCESSING; | |
fd5e64de | 1900 | cmd->transport_state |= CMD_T_ACTIVE | CMD_T_SENT; |
019c4ca6 | 1901 | spin_unlock_irq(&cmd->t_state_lock); |
aa58b531 NB |
1902 | |
1903 | if (target_write_prot_action(cmd)) | |
1904 | return; | |
019c4ca6 | 1905 | |
1a398b97 NB |
1906 | if (target_handle_task_attr(cmd)) { |
1907 | spin_lock_irq(&cmd->t_state_lock); | |
fd5e64de | 1908 | cmd->transport_state &= ~CMD_T_SENT; |
1a398b97 NB |
1909 | spin_unlock_irq(&cmd->t_state_lock); |
1910 | return; | |
1911 | } | |
1912 | ||
dff0ca9e | 1913 | __target_execute_cmd(cmd, true); |
c66ac9db | 1914 | } |
70baf0ab | 1915 | EXPORT_SYMBOL(target_execute_cmd); |
c66ac9db | 1916 | |
5f41a31d CH |
1917 | /* |
1918 | * Process all commands up to the last received ORDERED task attribute which | |
1919 | * requires another blocking boundary | |
1920 | */ | |
1921 | static void target_restart_delayed_cmds(struct se_device *dev) | |
1922 | { | |
1923 | for (;;) { | |
1924 | struct se_cmd *cmd; | |
1925 | ||
1926 | spin_lock(&dev->delayed_cmd_lock); | |
1927 | if (list_empty(&dev->delayed_cmd_list)) { | |
1928 | spin_unlock(&dev->delayed_cmd_lock); | |
1929 | break; | |
1930 | } | |
1931 | ||
1932 | cmd = list_entry(dev->delayed_cmd_list.next, | |
1933 | struct se_cmd, se_delayed_node); | |
1934 | list_del(&cmd->se_delayed_node); | |
1935 | spin_unlock(&dev->delayed_cmd_lock); | |
1936 | ||
dff0ca9e | 1937 | __target_execute_cmd(cmd, true); |
5f41a31d | 1938 | |
68d81f40 | 1939 | if (cmd->sam_task_attr == TCM_ORDERED_TAG) |
5f41a31d CH |
1940 | break; |
1941 | } | |
1942 | } | |
1943 | ||
c66ac9db | 1944 | /* |
35e0e757 | 1945 | * Called from I/O completion to determine which dormant/delayed |
c66ac9db NB |
1946 | * and ordered cmds need to have their tasks added to the execution queue. |
1947 | */ | |
1948 | static void transport_complete_task_attr(struct se_cmd *cmd) | |
1949 | { | |
5951146d | 1950 | struct se_device *dev = cmd->se_dev; |
c66ac9db | 1951 | |
a3541703 | 1952 | if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH) |
019c4ca6 CH |
1953 | return; |
1954 | ||
410c29df NB |
1955 | if (!(cmd->se_cmd_flags & SCF_TASK_ATTR_SET)) |
1956 | goto restart; | |
1957 | ||
68d81f40 | 1958 | if (cmd->sam_task_attr == TCM_SIMPLE_TAG) { |
33940d09 | 1959 | atomic_dec_mb(&dev->simple_cmds); |
c66ac9db | 1960 | dev->dev_cur_ordered_id++; |
68d81f40 | 1961 | } else if (cmd->sam_task_attr == TCM_HEAD_TAG) { |
c66ac9db | 1962 | dev->dev_cur_ordered_id++; |
9c31820b RD |
1963 | pr_debug("Incremented dev_cur_ordered_id: %u for HEAD_OF_QUEUE\n", |
1964 | dev->dev_cur_ordered_id); | |
68d81f40 | 1965 | } else if (cmd->sam_task_attr == TCM_ORDERED_TAG) { |
33940d09 | 1966 | atomic_dec_mb(&dev->dev_ordered_sync); |
c66ac9db NB |
1967 | |
1968 | dev->dev_cur_ordered_id++; | |
9c31820b RD |
1969 | pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED\n", |
1970 | dev->dev_cur_ordered_id); | |
c66ac9db | 1971 | } |
410c29df | 1972 | restart: |
5f41a31d | 1973 | target_restart_delayed_cmds(dev); |
c66ac9db NB |
1974 | } |
1975 | ||
e057f533 | 1976 | static void transport_complete_qf(struct se_cmd *cmd) |
07bde79a NB |
1977 | { |
1978 | int ret = 0; | |
1979 | ||
019c4ca6 | 1980 | transport_complete_task_attr(cmd); |
fa7e25cf NB |
1981 | /* |
1982 | * If a fabric driver ->write_pending() or ->queue_data_in() callback | |
1983 | * has returned neither -ENOMEM or -EAGAIN, assume it's fatal and | |
1984 | * the same callbacks should not be retried. Return CHECK_CONDITION | |
1985 | * if a scsi_status is not already set. | |
1986 | * | |
1987 | * If a fabric driver ->queue_status() has returned non zero, always | |
1988 | * keep retrying no matter what.. | |
1989 | */ | |
1990 | if (cmd->t_state == TRANSPORT_COMPLETE_QF_ERR) { | |
1991 | if (cmd->scsi_status) | |
1992 | goto queue_status; | |
e057f533 | 1993 | |
fa7e25cf NB |
1994 | cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE; |
1995 | cmd->scsi_status = SAM_STAT_CHECK_CONDITION; | |
1996 | cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER; | |
1997 | translate_sense_reason(cmd, TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE); | |
1998 | goto queue_status; | |
e057f533 | 1999 | } |
07bde79a | 2000 | |
fa7e25cf NB |
2001 | if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) |
2002 | goto queue_status; | |
2003 | ||
07bde79a NB |
2004 | switch (cmd->data_direction) { |
2005 | case DMA_FROM_DEVICE: | |
4347ab5a NB |
2006 | if (cmd->scsi_status) |
2007 | goto queue_status; | |
2008 | ||
e5c0d6ad | 2009 | trace_target_cmd_complete(cmd); |
07bde79a NB |
2010 | ret = cmd->se_tfo->queue_data_in(cmd); |
2011 | break; | |
2012 | case DMA_TO_DEVICE: | |
64577407 | 2013 | if (cmd->se_cmd_flags & SCF_BIDI) { |
07bde79a | 2014 | ret = cmd->se_tfo->queue_data_in(cmd); |
63509c60 | 2015 | break; |
07bde79a NB |
2016 | } |
2017 | /* Fall through for DMA_TO_DEVICE */ | |
2018 | case DMA_NONE: | |
4347ab5a | 2019 | queue_status: |
e5c0d6ad | 2020 | trace_target_cmd_complete(cmd); |
07bde79a NB |
2021 | ret = cmd->se_tfo->queue_status(cmd); |
2022 | break; | |
2023 | default: | |
2024 | break; | |
2025 | } | |
2026 | ||
e057f533 | 2027 | if (ret < 0) { |
fa7e25cf | 2028 | transport_handle_queue_full(cmd, cmd->se_dev, ret, false); |
e057f533 CH |
2029 | return; |
2030 | } | |
2031 | transport_lun_remove_cmd(cmd); | |
2032 | transport_cmd_check_stop_to_fabric(cmd); | |
07bde79a NB |
2033 | } |
2034 | ||
fa7e25cf NB |
2035 | static void transport_handle_queue_full(struct se_cmd *cmd, struct se_device *dev, |
2036 | int err, bool write_pending) | |
07bde79a | 2037 | { |
fa7e25cf NB |
2038 | /* |
2039 | * -EAGAIN or -ENOMEM signals retry of ->write_pending() and/or | |
2040 | * ->queue_data_in() callbacks from new process context. | |
2041 | * | |
2042 | * Otherwise for other errors, transport_complete_qf() will send | |
2043 | * CHECK_CONDITION via ->queue_status() instead of attempting to | |
2044 | * retry associated fabric driver data-transfer callbacks. | |
2045 | */ | |
2046 | if (err == -EAGAIN || err == -ENOMEM) { | |
2047 | cmd->t_state = (write_pending) ? TRANSPORT_COMPLETE_QF_WP : | |
2048 | TRANSPORT_COMPLETE_QF_OK; | |
2049 | } else { | |
2050 | pr_warn_ratelimited("Got unknown fabric queue status: %d\n", err); | |
2051 | cmd->t_state = TRANSPORT_COMPLETE_QF_ERR; | |
2052 | } | |
2053 | ||
07bde79a | 2054 | spin_lock_irq(&dev->qf_cmd_lock); |
07bde79a | 2055 | list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list); |
33940d09 | 2056 | atomic_inc_mb(&dev->dev_qf_count); |
07bde79a NB |
2057 | spin_unlock_irq(&cmd->se_dev->qf_cmd_lock); |
2058 | ||
2059 | schedule_work(&cmd->se_dev->qf_work_queue); | |
2060 | } | |
2061 | ||
fdeab852 | 2062 | static bool target_read_prot_action(struct se_cmd *cmd) |
bc005869 | 2063 | { |
fdeab852 NB |
2064 | switch (cmd->prot_op) { |
2065 | case TARGET_PROT_DIN_STRIP: | |
2066 | if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_STRIP)) { | |
f75b6fae SG |
2067 | u32 sectors = cmd->data_length >> |
2068 | ilog2(cmd->se_dev->dev_attrib.block_size); | |
2069 | ||
2070 | cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba, | |
2071 | sectors, 0, cmd->t_prot_sg, | |
2072 | 0); | |
2073 | if (cmd->pi_err) | |
fdeab852 | 2074 | return true; |
bc005869 | 2075 | } |
fdeab852 | 2076 | break; |
72c03850 NB |
2077 | case TARGET_PROT_DIN_INSERT: |
2078 | if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_INSERT) | |
2079 | break; | |
2080 | ||
2081 | sbc_dif_generate(cmd); | |
2082 | break; | |
fdeab852 NB |
2083 | default: |
2084 | break; | |
bc005869 NB |
2085 | } |
2086 | ||
2087 | return false; | |
2088 | } | |
2089 | ||
35e0e757 | 2090 | static void target_complete_ok_work(struct work_struct *work) |
c66ac9db | 2091 | { |
35e0e757 | 2092 | struct se_cmd *cmd = container_of(work, struct se_cmd, work); |
27a27099 | 2093 | int ret; |
35e0e757 | 2094 | |
c66ac9db NB |
2095 | /* |
2096 | * Check if we need to move delayed/dormant tasks from cmds on the | |
2097 | * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task | |
2098 | * Attribute. | |
2099 | */ | |
019c4ca6 CH |
2100 | transport_complete_task_attr(cmd); |
2101 | ||
07bde79a NB |
2102 | /* |
2103 | * Check to schedule QUEUE_FULL work, or execute an existing | |
2104 | * cmd->transport_qf_callback() | |
2105 | */ | |
2106 | if (atomic_read(&cmd->se_dev->dev_qf_count) != 0) | |
2107 | schedule_work(&cmd->se_dev->qf_work_queue); | |
2108 | ||
c66ac9db | 2109 | /* |
d5829eac | 2110 | * Check if we need to send a sense buffer from |
c66ac9db NB |
2111 | * the struct se_cmd in question. |
2112 | */ | |
2113 | if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) { | |
27a27099 | 2114 | WARN_ON(!cmd->scsi_status); |
27a27099 PB |
2115 | ret = transport_send_check_condition_and_sense( |
2116 | cmd, 0, 1); | |
fa7e25cf | 2117 | if (ret) |
27a27099 PB |
2118 | goto queue_full; |
2119 | ||
2120 | transport_lun_remove_cmd(cmd); | |
2121 | transport_cmd_check_stop_to_fabric(cmd); | |
2122 | return; | |
c66ac9db NB |
2123 | } |
2124 | /* | |
25985edc | 2125 | * Check for a callback, used by amongst other things |
a6b0133c | 2126 | * XDWRITE_READ_10 and COMPARE_AND_WRITE emulation. |
c66ac9db | 2127 | */ |
a6b0133c NB |
2128 | if (cmd->transport_complete_callback) { |
2129 | sense_reason_t rc; | |
057085e5 NB |
2130 | bool caw = (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE); |
2131 | bool zero_dl = !(cmd->data_length); | |
2132 | int post_ret = 0; | |
a6b0133c | 2133 | |
057085e5 NB |
2134 | rc = cmd->transport_complete_callback(cmd, true, &post_ret); |
2135 | if (!rc && !post_ret) { | |
2136 | if (caw && zero_dl) | |
c8e63985 NB |
2137 | goto queue_rsp; |
2138 | ||
a6b0133c | 2139 | return; |
a2890087 NB |
2140 | } else if (rc) { |
2141 | ret = transport_send_check_condition_and_sense(cmd, | |
2142 | rc, 0); | |
fa7e25cf | 2143 | if (ret) |
a2890087 | 2144 | goto queue_full; |
a6b0133c | 2145 | |
a2890087 NB |
2146 | transport_lun_remove_cmd(cmd); |
2147 | transport_cmd_check_stop_to_fabric(cmd); | |
2148 | return; | |
2149 | } | |
a6b0133c | 2150 | } |
c66ac9db | 2151 | |
c8e63985 | 2152 | queue_rsp: |
c66ac9db NB |
2153 | switch (cmd->data_direction) { |
2154 | case DMA_FROM_DEVICE: | |
4347ab5a NB |
2155 | if (cmd->scsi_status) |
2156 | goto queue_status; | |
2157 | ||
4cc987ea NB |
2158 | atomic_long_add(cmd->data_length, |
2159 | &cmd->se_lun->lun_stats.tx_data_octets); | |
bc005869 NB |
2160 | /* |
2161 | * Perform READ_STRIP of PI using software emulation when | |
2162 | * backend had PI enabled, if the transport will not be | |
2163 | * performing hardware READ_STRIP offload. | |
2164 | */ | |
fdeab852 | 2165 | if (target_read_prot_action(cmd)) { |
bc005869 NB |
2166 | ret = transport_send_check_condition_and_sense(cmd, |
2167 | cmd->pi_err, 0); | |
fa7e25cf | 2168 | if (ret) |
bc005869 NB |
2169 | goto queue_full; |
2170 | ||
2171 | transport_lun_remove_cmd(cmd); | |
2172 | transport_cmd_check_stop_to_fabric(cmd); | |
2173 | return; | |
2174 | } | |
c66ac9db | 2175 | |
e5c0d6ad | 2176 | trace_target_cmd_complete(cmd); |
07bde79a | 2177 | ret = cmd->se_tfo->queue_data_in(cmd); |
fa7e25cf | 2178 | if (ret) |
07bde79a | 2179 | goto queue_full; |
c66ac9db NB |
2180 | break; |
2181 | case DMA_TO_DEVICE: | |
4cc987ea NB |
2182 | atomic_long_add(cmd->data_length, |
2183 | &cmd->se_lun->lun_stats.rx_data_octets); | |
c66ac9db NB |
2184 | /* |
2185 | * Check if we need to send READ payload for BIDI-COMMAND | |
2186 | */ | |
64577407 | 2187 | if (cmd->se_cmd_flags & SCF_BIDI) { |
4cc987ea NB |
2188 | atomic_long_add(cmd->data_length, |
2189 | &cmd->se_lun->lun_stats.tx_data_octets); | |
07bde79a | 2190 | ret = cmd->se_tfo->queue_data_in(cmd); |
fa7e25cf | 2191 | if (ret) |
07bde79a | 2192 | goto queue_full; |
c66ac9db NB |
2193 | break; |
2194 | } | |
2195 | /* Fall through for DMA_TO_DEVICE */ | |
2196 | case DMA_NONE: | |
4347ab5a | 2197 | queue_status: |
e5c0d6ad | 2198 | trace_target_cmd_complete(cmd); |
07bde79a | 2199 | ret = cmd->se_tfo->queue_status(cmd); |
fa7e25cf | 2200 | if (ret) |
07bde79a | 2201 | goto queue_full; |
c66ac9db NB |
2202 | break; |
2203 | default: | |
2204 | break; | |
2205 | } | |
2206 | ||
2207 | transport_lun_remove_cmd(cmd); | |
2208 | transport_cmd_check_stop_to_fabric(cmd); | |
07bde79a NB |
2209 | return; |
2210 | ||
2211 | queue_full: | |
6708bb27 | 2212 | pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p," |
07bde79a | 2213 | " data_direction: %d\n", cmd, cmd->data_direction); |
fa7e25cf NB |
2214 | |
2215 | transport_handle_queue_full(cmd, cmd->se_dev, ret, false); | |
c66ac9db NB |
2216 | } |
2217 | ||
e64aa657 | 2218 | void target_free_sgl(struct scatterlist *sgl, int nents) |
c66ac9db | 2219 | { |
ec98f782 | 2220 | struct scatterlist *sg; |
ec98f782 | 2221 | int count; |
c66ac9db | 2222 | |
6708bb27 AG |
2223 | for_each_sg(sgl, sg, nents, count) |
2224 | __free_page(sg_page(sg)); | |
c66ac9db | 2225 | |
6708bb27 AG |
2226 | kfree(sgl); |
2227 | } | |
e64aa657 | 2228 | EXPORT_SYMBOL(target_free_sgl); |
c66ac9db | 2229 | |
47e459e6 NB |
2230 | static inline void transport_reset_sgl_orig(struct se_cmd *cmd) |
2231 | { | |
2232 | /* | |
2233 | * Check for saved t_data_sg that may be used for COMPARE_AND_WRITE | |
2234 | * emulation, and free + reset pointers if necessary.. | |
2235 | */ | |
2236 | if (!cmd->t_data_sg_orig) | |
2237 | return; | |
2238 | ||
2239 | kfree(cmd->t_data_sg); | |
2240 | cmd->t_data_sg = cmd->t_data_sg_orig; | |
2241 | cmd->t_data_sg_orig = NULL; | |
2242 | cmd->t_data_nents = cmd->t_data_nents_orig; | |
2243 | cmd->t_data_nents_orig = 0; | |
2244 | } | |
2245 | ||
6708bb27 AG |
2246 | static inline void transport_free_pages(struct se_cmd *cmd) |
2247 | { | |
5835812f | 2248 | if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) { |
e64aa657 | 2249 | target_free_sgl(cmd->t_prot_sg, cmd->t_prot_nents); |
5835812f AM |
2250 | cmd->t_prot_sg = NULL; |
2251 | cmd->t_prot_nents = 0; | |
2252 | } | |
2253 | ||
47e459e6 | 2254 | if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) { |
c8e63985 NB |
2255 | /* |
2256 | * Release special case READ buffer payload required for | |
2257 | * SG_TO_MEM_NOALLOC to function with COMPARE_AND_WRITE | |
2258 | */ | |
2259 | if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) { | |
e64aa657 | 2260 | target_free_sgl(cmd->t_bidi_data_sg, |
c8e63985 NB |
2261 | cmd->t_bidi_data_nents); |
2262 | cmd->t_bidi_data_sg = NULL; | |
2263 | cmd->t_bidi_data_nents = 0; | |
2264 | } | |
47e459e6 | 2265 | transport_reset_sgl_orig(cmd); |
6708bb27 | 2266 | return; |
47e459e6 NB |
2267 | } |
2268 | transport_reset_sgl_orig(cmd); | |
6708bb27 | 2269 | |
e64aa657 | 2270 | target_free_sgl(cmd->t_data_sg, cmd->t_data_nents); |
ec98f782 AG |
2271 | cmd->t_data_sg = NULL; |
2272 | cmd->t_data_nents = 0; | |
c66ac9db | 2273 | |
e64aa657 | 2274 | target_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents); |
ec98f782 AG |
2275 | cmd->t_bidi_data_sg = NULL; |
2276 | cmd->t_bidi_data_nents = 0; | |
c66ac9db NB |
2277 | } |
2278 | ||
e26d99ae | 2279 | /** |
febe562c NB |
2280 | * transport_put_cmd - release a reference to a command |
2281 | * @cmd: command to release | |
e26d99ae | 2282 | * |
febe562c | 2283 | * This routine releases our reference to the command and frees it if possible. |
e26d99ae | 2284 | */ |
febe562c | 2285 | static int transport_put_cmd(struct se_cmd *cmd) |
e26d99ae CH |
2286 | { |
2287 | BUG_ON(!cmd->se_tfo); | |
e26d99ae | 2288 | /* |
7481deb4 NB |
2289 | * If this cmd has been setup with target_get_sess_cmd(), drop |
2290 | * the kref and call ->release_cmd() in kref callback. | |
e26d99ae | 2291 | */ |
afc16604 | 2292 | return target_put_sess_cmd(cmd); |
e26d99ae CH |
2293 | } |
2294 | ||
4949314c | 2295 | void *transport_kmap_data_sg(struct se_cmd *cmd) |
05d1c7c0 | 2296 | { |
ec98f782 | 2297 | struct scatterlist *sg = cmd->t_data_sg; |
4949314c AG |
2298 | struct page **pages; |
2299 | int i; | |
05d1c7c0 AG |
2300 | |
2301 | /* | |
ec98f782 AG |
2302 | * We need to take into account a possible offset here for fabrics like |
2303 | * tcm_loop who may be using a contig buffer from the SCSI midlayer for | |
2304 | * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd() | |
05d1c7c0 | 2305 | */ |
4949314c AG |
2306 | if (!cmd->t_data_nents) |
2307 | return NULL; | |
3717ef0c PB |
2308 | |
2309 | BUG_ON(!sg); | |
2310 | if (cmd->t_data_nents == 1) | |
4949314c AG |
2311 | return kmap(sg_page(sg)) + sg->offset; |
2312 | ||
2313 | /* >1 page. use vmap */ | |
df6751f3 | 2314 | pages = kmalloc_array(cmd->t_data_nents, sizeof(*pages), GFP_KERNEL); |
de103c93 | 2315 | if (!pages) |
4949314c AG |
2316 | return NULL; |
2317 | ||
2318 | /* convert sg[] to pages[] */ | |
2319 | for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) { | |
2320 | pages[i] = sg_page(sg); | |
2321 | } | |
2322 | ||
2323 | cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL); | |
2324 | kfree(pages); | |
de103c93 | 2325 | if (!cmd->t_data_vmap) |
4949314c AG |
2326 | return NULL; |
2327 | ||
2328 | return cmd->t_data_vmap + cmd->t_data_sg[0].offset; | |
05d1c7c0 | 2329 | } |
4949314c | 2330 | EXPORT_SYMBOL(transport_kmap_data_sg); |
05d1c7c0 | 2331 | |
4949314c | 2332 | void transport_kunmap_data_sg(struct se_cmd *cmd) |
05d1c7c0 | 2333 | { |
a1edf9cf | 2334 | if (!cmd->t_data_nents) { |
4949314c | 2335 | return; |
a1edf9cf | 2336 | } else if (cmd->t_data_nents == 1) { |
4949314c | 2337 | kunmap(sg_page(cmd->t_data_sg)); |
a1edf9cf AG |
2338 | return; |
2339 | } | |
4949314c AG |
2340 | |
2341 | vunmap(cmd->t_data_vmap); | |
2342 | cmd->t_data_vmap = NULL; | |
05d1c7c0 | 2343 | } |
4949314c | 2344 | EXPORT_SYMBOL(transport_kunmap_data_sg); |
05d1c7c0 | 2345 | |
c5ff8d6b | 2346 | int |
20093994 | 2347 | target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, u32 length, |
e64aa657 | 2348 | bool zero_page, bool chainable) |
c66ac9db | 2349 | { |
20093994 | 2350 | struct scatterlist *sg; |
ec98f782 | 2351 | struct page *page; |
20093994 | 2352 | gfp_t zero_flag = (zero_page) ? __GFP_ZERO : 0; |
e64aa657 | 2353 | unsigned int nalloc, nent; |
ec98f782 | 2354 | int i = 0; |
c66ac9db | 2355 | |
e64aa657 CH |
2356 | nalloc = nent = DIV_ROUND_UP(length, PAGE_SIZE); |
2357 | if (chainable) | |
2358 | nalloc++; | |
2359 | sg = kmalloc_array(nalloc, sizeof(struct scatterlist), GFP_KERNEL); | |
20093994 | 2360 | if (!sg) |
ec98f782 | 2361 | return -ENOMEM; |
c66ac9db | 2362 | |
e64aa657 | 2363 | sg_init_table(sg, nalloc); |
9db9da33 | 2364 | |
ec98f782 AG |
2365 | while (length) { |
2366 | u32 page_len = min_t(u32, length, PAGE_SIZE); | |
9db9da33 | 2367 | page = alloc_page(GFP_KERNEL | zero_flag); |
ec98f782 AG |
2368 | if (!page) |
2369 | goto out; | |
c66ac9db | 2370 | |
20093994 | 2371 | sg_set_page(&sg[i], page, page_len, 0); |
ec98f782 AG |
2372 | length -= page_len; |
2373 | i++; | |
c66ac9db | 2374 | } |
20093994 NB |
2375 | *sgl = sg; |
2376 | *nents = nent; | |
c66ac9db | 2377 | return 0; |
c66ac9db | 2378 | |
ec98f782 | 2379 | out: |
d0e27c88 | 2380 | while (i > 0) { |
ec98f782 | 2381 | i--; |
20093994 | 2382 | __free_page(sg_page(&sg[i])); |
c66ac9db | 2383 | } |
20093994 | 2384 | kfree(sg); |
ec98f782 | 2385 | return -ENOMEM; |
c66ac9db | 2386 | } |
e64aa657 | 2387 | EXPORT_SYMBOL(target_alloc_sgl); |
c66ac9db | 2388 | |
da0f7619 | 2389 | /* |
b16a35b0 AG |
2390 | * Allocate any required resources to execute the command. For writes we |
2391 | * might not have the payload yet, so notify the fabric via a call to | |
2392 | * ->write_pending instead. Otherwise place it on the execution queue. | |
c66ac9db | 2393 | */ |
de103c93 CH |
2394 | sense_reason_t |
2395 | transport_generic_new_cmd(struct se_cmd *cmd) | |
c66ac9db | 2396 | { |
b1a2ecda | 2397 | unsigned long flags; |
c66ac9db | 2398 | int ret = 0; |
c8e63985 | 2399 | bool zero_flag = !(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB); |
c66ac9db | 2400 | |
5835812f AM |
2401 | if (cmd->prot_op != TARGET_PROT_NORMAL && |
2402 | !(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) { | |
2403 | ret = target_alloc_sgl(&cmd->t_prot_sg, &cmd->t_prot_nents, | |
e64aa657 | 2404 | cmd->prot_length, true, false); |
5835812f AM |
2405 | if (ret < 0) |
2406 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
2407 | } | |
2408 | ||
c66ac9db NB |
2409 | /* |
2410 | * Determine is the TCM fabric module has already allocated physical | |
2411 | * memory, and is directly calling transport_generic_map_mem_to_cmd() | |
ec98f782 | 2412 | * beforehand. |
c66ac9db | 2413 | */ |
ec98f782 AG |
2414 | if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) && |
2415 | cmd->data_length) { | |
20093994 | 2416 | |
8cefe07b NB |
2417 | if ((cmd->se_cmd_flags & SCF_BIDI) || |
2418 | (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) { | |
2419 | u32 bidi_length; | |
2420 | ||
2421 | if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) | |
2422 | bidi_length = cmd->t_task_nolb * | |
2423 | cmd->se_dev->dev_attrib.block_size; | |
2424 | else | |
2425 | bidi_length = cmd->data_length; | |
2426 | ||
2427 | ret = target_alloc_sgl(&cmd->t_bidi_data_sg, | |
2428 | &cmd->t_bidi_data_nents, | |
e64aa657 | 2429 | bidi_length, zero_flag, false); |
8cefe07b NB |
2430 | if (ret < 0) |
2431 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
2432 | } | |
2433 | ||
20093994 | 2434 | ret = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents, |
e64aa657 | 2435 | cmd->data_length, zero_flag, false); |
c66ac9db | 2436 | if (ret < 0) |
de103c93 | 2437 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
c8e63985 NB |
2438 | } else if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) && |
2439 | cmd->data_length) { | |
2440 | /* | |
2441 | * Special case for COMPARE_AND_WRITE with fabrics | |
2442 | * using SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC. | |
2443 | */ | |
2444 | u32 caw_length = cmd->t_task_nolb * | |
2445 | cmd->se_dev->dev_attrib.block_size; | |
2446 | ||
2447 | ret = target_alloc_sgl(&cmd->t_bidi_data_sg, | |
2448 | &cmd->t_bidi_data_nents, | |
e64aa657 | 2449 | caw_length, zero_flag, false); |
c8e63985 NB |
2450 | if (ret < 0) |
2451 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
c66ac9db | 2452 | } |
c66ac9db | 2453 | /* |
c3196f0c CH |
2454 | * If this command is not a write we can execute it right here, |
2455 | * for write buffers we need to notify the fabric driver first | |
2456 | * and let it call back once the write buffers are ready. | |
c66ac9db | 2457 | */ |
5f41a31d | 2458 | target_add_to_state_list(cmd); |
885e7b0e | 2459 | if (cmd->data_direction != DMA_TO_DEVICE || cmd->data_length == 0) { |
c3196f0c CH |
2460 | target_execute_cmd(cmd); |
2461 | return 0; | |
2462 | } | |
b1a2ecda BVA |
2463 | |
2464 | spin_lock_irqsave(&cmd->t_state_lock, flags); | |
2465 | cmd->t_state = TRANSPORT_WRITE_PENDING; | |
2466 | /* | |
2467 | * Determine if frontend context caller is requesting the stopping of | |
2468 | * this command for frontend exceptions. | |
2469 | */ | |
2470 | if (cmd->transport_state & CMD_T_STOP) { | |
2471 | pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n", | |
2472 | __func__, __LINE__, cmd->tag); | |
2473 | ||
2474 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
2475 | ||
2476 | complete_all(&cmd->t_transport_stop_comp); | |
a5eb307f | 2477 | return 0; |
b1a2ecda BVA |
2478 | } |
2479 | cmd->transport_state &= ~CMD_T_ACTIVE; | |
2480 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
c3196f0c CH |
2481 | |
2482 | ret = cmd->se_tfo->write_pending(cmd); | |
fa7e25cf | 2483 | if (ret) |
c3196f0c CH |
2484 | goto queue_full; |
2485 | ||
fa7e25cf | 2486 | return 0; |
da0f7619 | 2487 | |
c3196f0c CH |
2488 | queue_full: |
2489 | pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd); | |
fa7e25cf | 2490 | transport_handle_queue_full(cmd, cmd->se_dev, ret, true); |
c3196f0c | 2491 | return 0; |
c66ac9db | 2492 | } |
a1d8b49a | 2493 | EXPORT_SYMBOL(transport_generic_new_cmd); |
c66ac9db | 2494 | |
e057f533 | 2495 | static void transport_write_pending_qf(struct se_cmd *cmd) |
07bde79a | 2496 | { |
f147abb4 NB |
2497 | int ret; |
2498 | ||
2499 | ret = cmd->se_tfo->write_pending(cmd); | |
fa7e25cf | 2500 | if (ret) { |
e057f533 CH |
2501 | pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", |
2502 | cmd); | |
fa7e25cf | 2503 | transport_handle_queue_full(cmd, cmd->se_dev, ret, true); |
e057f533 | 2504 | } |
07bde79a NB |
2505 | } |
2506 | ||
0f4a9431 NB |
2507 | static bool |
2508 | __transport_wait_for_tasks(struct se_cmd *, bool, bool *, bool *, | |
2509 | unsigned long *flags); | |
2510 | ||
2511 | static void target_wait_free_cmd(struct se_cmd *cmd, bool *aborted, bool *tas) | |
2512 | { | |
2513 | unsigned long flags; | |
2514 | ||
2515 | spin_lock_irqsave(&cmd->t_state_lock, flags); | |
2516 | __transport_wait_for_tasks(cmd, true, aborted, tas, &flags); | |
2517 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
2518 | } | |
2519 | ||
d5ddad41 | 2520 | int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks) |
c66ac9db | 2521 | { |
d5ddad41 | 2522 | int ret = 0; |
0f4a9431 | 2523 | bool aborted = false, tas = false; |
d5ddad41 | 2524 | |
d14921d6 | 2525 | if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) { |
c8e31f26 | 2526 | if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) |
0f4a9431 | 2527 | target_wait_free_cmd(cmd, &aborted, &tas); |
d14921d6 | 2528 | |
0f4a9431 NB |
2529 | if (!aborted || tas) |
2530 | ret = transport_put_cmd(cmd); | |
d14921d6 NB |
2531 | } else { |
2532 | if (wait_for_tasks) | |
0f4a9431 | 2533 | target_wait_free_cmd(cmd, &aborted, &tas); |
c130480b NB |
2534 | /* |
2535 | * Handle WRITE failure case where transport_generic_new_cmd() | |
2536 | * has already added se_cmd to state_list, but fabric has | |
2537 | * failed command before I/O submission. | |
2538 | */ | |
febe562c | 2539 | if (cmd->state_active) |
c130480b | 2540 | target_remove_from_state_list(cmd); |
d14921d6 | 2541 | |
82f1c8a4 | 2542 | if (cmd->se_lun) |
c66ac9db | 2543 | transport_lun_remove_cmd(cmd); |
c66ac9db | 2544 | |
0f4a9431 NB |
2545 | if (!aborted || tas) |
2546 | ret = transport_put_cmd(cmd); | |
2547 | } | |
2548 | /* | |
2549 | * If the task has been internally aborted due to TMR ABORT_TASK | |
2550 | * or LUN_RESET, target_core_tmr.c is responsible for performing | |
2551 | * the remaining calls to target_put_sess_cmd(), and not the | |
2552 | * callers of this function. | |
2553 | */ | |
2554 | if (aborted) { | |
2555 | pr_debug("Detected CMD_T_ABORTED for ITT: %llu\n", cmd->tag); | |
2556 | wait_for_completion(&cmd->cmd_wait_comp); | |
2557 | cmd->se_tfo->release_cmd(cmd); | |
2558 | ret = 1; | |
c66ac9db | 2559 | } |
d5ddad41 | 2560 | return ret; |
c66ac9db NB |
2561 | } |
2562 | EXPORT_SYMBOL(transport_generic_free_cmd); | |
2563 | ||
a17f091d | 2564 | /* target_get_sess_cmd - Add command to active ->sess_cmd_list |
a17f091d | 2565 | * @se_cmd: command descriptor to add |
a6360785 | 2566 | * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd() |
a17f091d | 2567 | */ |
afc16604 | 2568 | int target_get_sess_cmd(struct se_cmd *se_cmd, bool ack_kref) |
a17f091d | 2569 | { |
afc16604 | 2570 | struct se_session *se_sess = se_cmd->se_sess; |
a17f091d | 2571 | unsigned long flags; |
bc187ea6 | 2572 | int ret = 0; |
a17f091d | 2573 | |
a6360785 NB |
2574 | /* |
2575 | * Add a second kref if the fabric caller is expecting to handle | |
2576 | * fabric acknowledgement that requires two target_put_sess_cmd() | |
2577 | * invocations before se_cmd descriptor release. | |
2578 | */ | |
527268df | 2579 | if (ack_kref) { |
1b4c59b7 HR |
2580 | if (!kref_get_unless_zero(&se_cmd->cmd_kref)) |
2581 | return -EINVAL; | |
2582 | ||
527268df NB |
2583 | se_cmd->se_cmd_flags |= SCF_ACK_KREF; |
2584 | } | |
7481deb4 | 2585 | |
a17f091d | 2586 | spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); |
bc187ea6 RD |
2587 | if (se_sess->sess_tearing_down) { |
2588 | ret = -ESHUTDOWN; | |
2589 | goto out; | |
2590 | } | |
a17f091d | 2591 | list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list); |
bc187ea6 | 2592 | out: |
a17f091d | 2593 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); |
7544e597 BVA |
2594 | |
2595 | if (ret && ack_kref) | |
afc16604 | 2596 | target_put_sess_cmd(se_cmd); |
7544e597 | 2597 | |
bc187ea6 | 2598 | return ret; |
a17f091d | 2599 | } |
20361e69 | 2600 | EXPORT_SYMBOL(target_get_sess_cmd); |
a17f091d | 2601 | |
febe562c NB |
2602 | static void target_free_cmd_mem(struct se_cmd *cmd) |
2603 | { | |
2604 | transport_free_pages(cmd); | |
2605 | ||
2606 | if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB) | |
2607 | core_tmr_release_req(cmd->se_tmr_req); | |
2608 | if (cmd->t_task_cdb != cmd->__t_task_cdb) | |
2609 | kfree(cmd->t_task_cdb); | |
2610 | } | |
2611 | ||
7481deb4 | 2612 | static void target_release_cmd_kref(struct kref *kref) |
a17f091d | 2613 | { |
7481deb4 NB |
2614 | struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref); |
2615 | struct se_session *se_sess = se_cmd->se_sess; | |
9ff9d15e | 2616 | unsigned long flags; |
0f4a9431 | 2617 | bool fabric_stop; |
a17f091d | 2618 | |
6b6427b6 BVA |
2619 | if (se_sess) { |
2620 | spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); | |
2621 | ||
2622 | spin_lock(&se_cmd->t_state_lock); | |
2623 | fabric_stop = (se_cmd->transport_state & CMD_T_FABRIC_STOP) && | |
2624 | (se_cmd->transport_state & CMD_T_ABORTED); | |
2625 | spin_unlock(&se_cmd->t_state_lock); | |
2626 | ||
2627 | if (se_cmd->cmd_wait_set || fabric_stop) { | |
2628 | list_del_init(&se_cmd->se_cmd_list); | |
2629 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); | |
2630 | target_free_cmd_mem(se_cmd); | |
2631 | complete(&se_cmd->cmd_wait_comp); | |
2632 | return; | |
2633 | } | |
0f4a9431 | 2634 | list_del_init(&se_cmd->se_cmd_list); |
9ff9d15e | 2635 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); |
a17f091d | 2636 | } |
a17f091d | 2637 | |
febe562c | 2638 | target_free_cmd_mem(se_cmd); |
7481deb4 NB |
2639 | se_cmd->se_tfo->release_cmd(se_cmd); |
2640 | } | |
2641 | ||
6b6427b6 BVA |
2642 | /** |
2643 | * target_put_sess_cmd - decrease the command reference count | |
2644 | * @se_cmd: command to drop a reference from | |
2645 | * | |
2646 | * Returns 1 if and only if this target_put_sess_cmd() call caused the | |
2647 | * refcount to drop to zero. Returns zero otherwise. | |
7481deb4 | 2648 | */ |
afc16604 | 2649 | int target_put_sess_cmd(struct se_cmd *se_cmd) |
7481deb4 | 2650 | { |
9ff9d15e | 2651 | return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref); |
a17f091d NB |
2652 | } |
2653 | EXPORT_SYMBOL(target_put_sess_cmd); | |
2654 | ||
1c7b13fe RD |
2655 | /* target_sess_cmd_list_set_waiting - Flag all commands in |
2656 | * sess_cmd_list to complete cmd_wait_comp. Set | |
2657 | * sess_tearing_down so no more commands are queued. | |
2658 | * @se_sess: session to flag | |
a17f091d | 2659 | */ |
1c7b13fe | 2660 | void target_sess_cmd_list_set_waiting(struct se_session *se_sess) |
a17f091d | 2661 | { |
1b4c59b7 | 2662 | struct se_cmd *se_cmd, *tmp_cmd; |
a17f091d | 2663 | unsigned long flags; |
0f4a9431 | 2664 | int rc; |
a17f091d | 2665 | |
a17f091d | 2666 | spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); |
9b31a328 NB |
2667 | if (se_sess->sess_tearing_down) { |
2668 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); | |
2669 | return; | |
2670 | } | |
1c7b13fe | 2671 | se_sess->sess_tearing_down = 1; |
9b31a328 | 2672 | list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list); |
a17f091d | 2673 | |
1b4c59b7 HR |
2674 | list_for_each_entry_safe(se_cmd, tmp_cmd, |
2675 | &se_sess->sess_wait_list, se_cmd_list) { | |
0f4a9431 NB |
2676 | rc = kref_get_unless_zero(&se_cmd->cmd_kref); |
2677 | if (rc) { | |
2678 | se_cmd->cmd_wait_set = 1; | |
2679 | spin_lock(&se_cmd->t_state_lock); | |
2680 | se_cmd->transport_state |= CMD_T_FABRIC_STOP; | |
2681 | spin_unlock(&se_cmd->t_state_lock); | |
1b4c59b7 HR |
2682 | } else |
2683 | list_del_init(&se_cmd->se_cmd_list); | |
0f4a9431 | 2684 | } |
a17f091d NB |
2685 | |
2686 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); | |
2687 | } | |
1c7b13fe | 2688 | EXPORT_SYMBOL(target_sess_cmd_list_set_waiting); |
a17f091d NB |
2689 | |
2690 | /* target_wait_for_sess_cmds - Wait for outstanding descriptors | |
2691 | * @se_sess: session to wait for active I/O | |
a17f091d | 2692 | */ |
be646c2d | 2693 | void target_wait_for_sess_cmds(struct se_session *se_sess) |
a17f091d NB |
2694 | { |
2695 | struct se_cmd *se_cmd, *tmp_cmd; | |
9b31a328 | 2696 | unsigned long flags; |
0f4a9431 | 2697 | bool tas; |
a17f091d NB |
2698 | |
2699 | list_for_each_entry_safe(se_cmd, tmp_cmd, | |
9b31a328 | 2700 | &se_sess->sess_wait_list, se_cmd_list) { |
a17f091d NB |
2701 | pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:" |
2702 | " %d\n", se_cmd, se_cmd->t_state, | |
2703 | se_cmd->se_tfo->get_cmd_state(se_cmd)); | |
2704 | ||
0f4a9431 NB |
2705 | spin_lock_irqsave(&se_cmd->t_state_lock, flags); |
2706 | tas = (se_cmd->transport_state & CMD_T_TAS); | |
2707 | spin_unlock_irqrestore(&se_cmd->t_state_lock, flags); | |
2708 | ||
2709 | if (!target_put_sess_cmd(se_cmd)) { | |
2710 | if (tas) | |
2711 | target_put_sess_cmd(se_cmd); | |
2712 | } | |
2713 | ||
be646c2d JE |
2714 | wait_for_completion(&se_cmd->cmd_wait_comp); |
2715 | pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d" | |
2716 | " fabric state: %d\n", se_cmd, se_cmd->t_state, | |
2717 | se_cmd->se_tfo->get_cmd_state(se_cmd)); | |
a17f091d NB |
2718 | |
2719 | se_cmd->se_tfo->release_cmd(se_cmd); | |
2720 | } | |
9b31a328 NB |
2721 | |
2722 | spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); | |
2723 | WARN_ON(!list_empty(&se_sess->sess_cmd_list)); | |
2724 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); | |
2725 | ||
a17f091d NB |
2726 | } |
2727 | EXPORT_SYMBOL(target_wait_for_sess_cmds); | |
2728 | ||
bd4e2d29 NB |
2729 | static void target_lun_confirm(struct percpu_ref *ref) |
2730 | { | |
2731 | struct se_lun *lun = container_of(ref, struct se_lun, lun_ref); | |
2732 | ||
2733 | complete(&lun->lun_ref_comp); | |
2734 | } | |
2735 | ||
b3eeea66 | 2736 | void transport_clear_lun_ref(struct se_lun *lun) |
c66ac9db | 2737 | { |
bd4e2d29 NB |
2738 | /* |
2739 | * Mark the percpu-ref as DEAD, switch to atomic_t mode, drop | |
2740 | * the initial reference and schedule confirm kill to be | |
2741 | * executed after one full RCU grace period has completed. | |
2742 | */ | |
2743 | percpu_ref_kill_and_confirm(&lun->lun_ref, target_lun_confirm); | |
2744 | /* | |
2745 | * The first completion waits for percpu_ref_switch_to_atomic_rcu() | |
2746 | * to call target_lun_confirm after lun->lun_ref has been marked | |
2747 | * as __PERCPU_REF_DEAD on all CPUs, and switches to atomic_t | |
2748 | * mode so that percpu_ref_tryget_live() lookup of lun->lun_ref | |
2749 | * fails for all new incoming I/O. | |
2750 | */ | |
5277797d | 2751 | wait_for_completion(&lun->lun_ref_comp); |
bd4e2d29 NB |
2752 | /* |
2753 | * The second completion waits for percpu_ref_put_many() to | |
2754 | * invoke ->release() after lun->lun_ref has switched to | |
2755 | * atomic_t mode, and lun->lun_ref.count has reached zero. | |
2756 | * | |
2757 | * At this point all target-core lun->lun_ref references have | |
2758 | * been dropped via transport_lun_remove_cmd(), and it's safe | |
2759 | * to proceed with the remaining LUN shutdown. | |
2760 | */ | |
2761 | wait_for_completion(&lun->lun_shutdown_comp); | |
c66ac9db NB |
2762 | } |
2763 | ||
0f4a9431 NB |
2764 | static bool |
2765 | __transport_wait_for_tasks(struct se_cmd *cmd, bool fabric_stop, | |
2766 | bool *aborted, bool *tas, unsigned long *flags) | |
2767 | __releases(&cmd->t_state_lock) | |
2768 | __acquires(&cmd->t_state_lock) | |
c66ac9db | 2769 | { |
c66ac9db | 2770 | |
0f4a9431 NB |
2771 | assert_spin_locked(&cmd->t_state_lock); |
2772 | WARN_ON_ONCE(!irqs_disabled()); | |
2773 | ||
2774 | if (fabric_stop) | |
2775 | cmd->transport_state |= CMD_T_FABRIC_STOP; | |
2776 | ||
2777 | if (cmd->transport_state & CMD_T_ABORTED) | |
2778 | *aborted = true; | |
2779 | ||
2780 | if (cmd->transport_state & CMD_T_TAS) | |
2781 | *tas = true; | |
2782 | ||
c8e31f26 | 2783 | if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && |
0f4a9431 | 2784 | !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) |
a17f091d | 2785 | return false; |
cb4f4d3c | 2786 | |
c8e31f26 | 2787 | if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) && |
0f4a9431 | 2788 | !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) |
a17f091d | 2789 | return false; |
7d680f3b | 2790 | |
0f4a9431 NB |
2791 | if (!(cmd->transport_state & CMD_T_ACTIVE)) |
2792 | return false; | |
2793 | ||
2794 | if (fabric_stop && *aborted) | |
a17f091d | 2795 | return false; |
c66ac9db | 2796 | |
7d680f3b | 2797 | cmd->transport_state |= CMD_T_STOP; |
c66ac9db | 2798 | |
0f4a9431 NB |
2799 | pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08llx i_state: %d," |
2800 | " t_state: %d, CMD_T_STOP\n", cmd, cmd->tag, | |
2801 | cmd->se_tfo->get_cmd_state(cmd), cmd->t_state); | |
c66ac9db | 2802 | |
0f4a9431 | 2803 | spin_unlock_irqrestore(&cmd->t_state_lock, *flags); |
c66ac9db | 2804 | |
a1d8b49a | 2805 | wait_for_completion(&cmd->t_transport_stop_comp); |
c66ac9db | 2806 | |
0f4a9431 | 2807 | spin_lock_irqsave(&cmd->t_state_lock, *flags); |
7d680f3b | 2808 | cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP); |
c66ac9db | 2809 | |
0f4a9431 NB |
2810 | pr_debug("wait_for_tasks: Stopped wait_for_completion(&cmd->" |
2811 | "t_transport_stop_comp) for ITT: 0x%08llx\n", cmd->tag); | |
c66ac9db | 2812 | |
0f4a9431 NB |
2813 | return true; |
2814 | } | |
2815 | ||
2816 | /** | |
2d4760ee BVA |
2817 | * transport_wait_for_tasks - set CMD_T_STOP and wait for t_transport_stop_comp |
2818 | * @cmd: command to wait on | |
0f4a9431 NB |
2819 | */ |
2820 | bool transport_wait_for_tasks(struct se_cmd *cmd) | |
2821 | { | |
2822 | unsigned long flags; | |
2823 | bool ret, aborted = false, tas = false; | |
2824 | ||
2825 | spin_lock_irqsave(&cmd->t_state_lock, flags); | |
2826 | ret = __transport_wait_for_tasks(cmd, false, &aborted, &tas, &flags); | |
d14921d6 | 2827 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
a17f091d | 2828 | |
0f4a9431 | 2829 | return ret; |
c66ac9db | 2830 | } |
d14921d6 | 2831 | EXPORT_SYMBOL(transport_wait_for_tasks); |
c66ac9db | 2832 | |
ab78fef4 BVA |
2833 | struct sense_info { |
2834 | u8 key; | |
2835 | u8 asc; | |
2836 | u8 ascq; | |
2837 | bool add_sector_info; | |
2838 | }; | |
2839 | ||
2840 | static const struct sense_info sense_info_table[] = { | |
2841 | [TCM_NO_SENSE] = { | |
2842 | .key = NOT_READY | |
2843 | }, | |
2844 | [TCM_NON_EXISTENT_LUN] = { | |
2845 | .key = ILLEGAL_REQUEST, | |
2846 | .asc = 0x25 /* LOGICAL UNIT NOT SUPPORTED */ | |
2847 | }, | |
2848 | [TCM_UNSUPPORTED_SCSI_OPCODE] = { | |
2849 | .key = ILLEGAL_REQUEST, | |
2850 | .asc = 0x20, /* INVALID COMMAND OPERATION CODE */ | |
2851 | }, | |
2852 | [TCM_SECTOR_COUNT_TOO_MANY] = { | |
2853 | .key = ILLEGAL_REQUEST, | |
2854 | .asc = 0x20, /* INVALID COMMAND OPERATION CODE */ | |
2855 | }, | |
2856 | [TCM_UNKNOWN_MODE_PAGE] = { | |
2857 | .key = ILLEGAL_REQUEST, | |
2858 | .asc = 0x24, /* INVALID FIELD IN CDB */ | |
2859 | }, | |
2860 | [TCM_CHECK_CONDITION_ABORT_CMD] = { | |
2861 | .key = ABORTED_COMMAND, | |
2862 | .asc = 0x29, /* BUS DEVICE RESET FUNCTION OCCURRED */ | |
2863 | .ascq = 0x03, | |
2864 | }, | |
2865 | [TCM_INCORRECT_AMOUNT_OF_DATA] = { | |
2866 | .key = ABORTED_COMMAND, | |
2867 | .asc = 0x0c, /* WRITE ERROR */ | |
2868 | .ascq = 0x0d, /* NOT ENOUGH UNSOLICITED DATA */ | |
2869 | }, | |
2870 | [TCM_INVALID_CDB_FIELD] = { | |
2871 | .key = ILLEGAL_REQUEST, | |
2872 | .asc = 0x24, /* INVALID FIELD IN CDB */ | |
2873 | }, | |
2874 | [TCM_INVALID_PARAMETER_LIST] = { | |
2875 | .key = ILLEGAL_REQUEST, | |
2876 | .asc = 0x26, /* INVALID FIELD IN PARAMETER LIST */ | |
2877 | }, | |
e8642120 DD |
2878 | [TCM_TOO_MANY_TARGET_DESCS] = { |
2879 | .key = ILLEGAL_REQUEST, | |
2880 | .asc = 0x26, | |
2881 | .ascq = 0x06, /* TOO MANY TARGET DESCRIPTORS */ | |
2882 | }, | |
2883 | [TCM_UNSUPPORTED_TARGET_DESC_TYPE_CODE] = { | |
2884 | .key = ILLEGAL_REQUEST, | |
2885 | .asc = 0x26, | |
2886 | .ascq = 0x07, /* UNSUPPORTED TARGET DESCRIPTOR TYPE CODE */ | |
2887 | }, | |
2888 | [TCM_TOO_MANY_SEGMENT_DESCS] = { | |
2889 | .key = ILLEGAL_REQUEST, | |
2890 | .asc = 0x26, | |
2891 | .ascq = 0x08, /* TOO MANY SEGMENT DESCRIPTORS */ | |
2892 | }, | |
2893 | [TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE] = { | |
2894 | .key = ILLEGAL_REQUEST, | |
2895 | .asc = 0x26, | |
2896 | .ascq = 0x09, /* UNSUPPORTED SEGMENT DESCRIPTOR TYPE CODE */ | |
2897 | }, | |
ab78fef4 BVA |
2898 | [TCM_PARAMETER_LIST_LENGTH_ERROR] = { |
2899 | .key = ILLEGAL_REQUEST, | |
2900 | .asc = 0x1a, /* PARAMETER LIST LENGTH ERROR */ | |
2901 | }, | |
2902 | [TCM_UNEXPECTED_UNSOLICITED_DATA] = { | |
2903 | .key = ILLEGAL_REQUEST, | |
2904 | .asc = 0x0c, /* WRITE ERROR */ | |
2905 | .ascq = 0x0c, /* UNEXPECTED_UNSOLICITED_DATA */ | |
2906 | }, | |
2907 | [TCM_SERVICE_CRC_ERROR] = { | |
2908 | .key = ABORTED_COMMAND, | |
2909 | .asc = 0x47, /* PROTOCOL SERVICE CRC ERROR */ | |
2910 | .ascq = 0x05, /* N/A */ | |
2911 | }, | |
2912 | [TCM_SNACK_REJECTED] = { | |
2913 | .key = ABORTED_COMMAND, | |
2914 | .asc = 0x11, /* READ ERROR */ | |
2915 | .ascq = 0x13, /* FAILED RETRANSMISSION REQUEST */ | |
2916 | }, | |
2917 | [TCM_WRITE_PROTECTED] = { | |
2918 | .key = DATA_PROTECT, | |
2919 | .asc = 0x27, /* WRITE PROTECTED */ | |
2920 | }, | |
2921 | [TCM_ADDRESS_OUT_OF_RANGE] = { | |
2922 | .key = ILLEGAL_REQUEST, | |
2923 | .asc = 0x21, /* LOGICAL BLOCK ADDRESS OUT OF RANGE */ | |
2924 | }, | |
2925 | [TCM_CHECK_CONDITION_UNIT_ATTENTION] = { | |
2926 | .key = UNIT_ATTENTION, | |
2927 | }, | |
2928 | [TCM_CHECK_CONDITION_NOT_READY] = { | |
2929 | .key = NOT_READY, | |
2930 | }, | |
2931 | [TCM_MISCOMPARE_VERIFY] = { | |
2932 | .key = MISCOMPARE, | |
2933 | .asc = 0x1d, /* MISCOMPARE DURING VERIFY OPERATION */ | |
2934 | .ascq = 0x00, | |
2935 | }, | |
2936 | [TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED] = { | |
734ca5c4 | 2937 | .key = ABORTED_COMMAND, |
ab78fef4 BVA |
2938 | .asc = 0x10, |
2939 | .ascq = 0x01, /* LOGICAL BLOCK GUARD CHECK FAILED */ | |
2940 | .add_sector_info = true, | |
2941 | }, | |
2942 | [TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED] = { | |
734ca5c4 | 2943 | .key = ABORTED_COMMAND, |
ab78fef4 BVA |
2944 | .asc = 0x10, |
2945 | .ascq = 0x02, /* LOGICAL BLOCK APPLICATION TAG CHECK FAILED */ | |
2946 | .add_sector_info = true, | |
2947 | }, | |
2948 | [TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED] = { | |
734ca5c4 | 2949 | .key = ABORTED_COMMAND, |
ab78fef4 BVA |
2950 | .asc = 0x10, |
2951 | .ascq = 0x03, /* LOGICAL BLOCK REFERENCE TAG CHECK FAILED */ | |
2952 | .add_sector_info = true, | |
2953 | }, | |
449a1378 NB |
2954 | [TCM_COPY_TARGET_DEVICE_NOT_REACHABLE] = { |
2955 | .key = COPY_ABORTED, | |
2956 | .asc = 0x0d, | |
2957 | .ascq = 0x02, /* COPY TARGET DEVICE NOT REACHABLE */ | |
2958 | ||
2959 | }, | |
ab78fef4 BVA |
2960 | [TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE] = { |
2961 | /* | |
2962 | * Returning ILLEGAL REQUEST would cause immediate IO errors on | |
2963 | * Solaris initiators. Returning NOT READY instead means the | |
2964 | * operations will be retried a finite number of times and we | |
2965 | * can survive intermittent errors. | |
2966 | */ | |
2967 | .key = NOT_READY, | |
2968 | .asc = 0x08, /* LOGICAL UNIT COMMUNICATION FAILURE */ | |
2969 | }, | |
2970 | }; | |
2971 | ||
f5a8b3a7 | 2972 | static int translate_sense_reason(struct se_cmd *cmd, sense_reason_t reason) |
ab78fef4 BVA |
2973 | { |
2974 | const struct sense_info *si; | |
2975 | u8 *buffer = cmd->sense_buffer; | |
2976 | int r = (__force int)reason; | |
2977 | u8 asc, ascq; | |
4e4937e8 | 2978 | bool desc_format = target_sense_desc_format(cmd->se_dev); |
ab78fef4 BVA |
2979 | |
2980 | if (r < ARRAY_SIZE(sense_info_table) && sense_info_table[r].key) | |
2981 | si = &sense_info_table[r]; | |
2982 | else | |
2983 | si = &sense_info_table[(__force int) | |
2984 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE]; | |
2985 | ||
ab78fef4 BVA |
2986 | if (reason == TCM_CHECK_CONDITION_UNIT_ATTENTION) { |
2987 | core_scsi3_ua_for_check_condition(cmd, &asc, &ascq); | |
2988 | WARN_ON_ONCE(asc == 0); | |
2989 | } else if (si->asc == 0) { | |
2990 | WARN_ON_ONCE(cmd->scsi_asc == 0); | |
2991 | asc = cmd->scsi_asc; | |
2992 | ascq = cmd->scsi_ascq; | |
2993 | } else { | |
2994 | asc = si->asc; | |
2995 | ascq = si->ascq; | |
2996 | } | |
9ec1e1ce | 2997 | |
4e4937e8 | 2998 | scsi_build_sense_buffer(desc_format, buffer, si->key, asc, ascq); |
ab78fef4 | 2999 | if (si->add_sector_info) |
f5a8b3a7 SG |
3000 | return scsi_set_sense_information(buffer, |
3001 | cmd->scsi_sense_length, | |
3002 | cmd->bad_sector); | |
3003 | ||
3004 | return 0; | |
ab78fef4 BVA |
3005 | } |
3006 | ||
de103c93 CH |
3007 | int |
3008 | transport_send_check_condition_and_sense(struct se_cmd *cmd, | |
3009 | sense_reason_t reason, int from_transport) | |
c66ac9db | 3010 | { |
c66ac9db | 3011 | unsigned long flags; |
c66ac9db | 3012 | |
a1d8b49a | 3013 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 3014 | if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) { |
a1d8b49a | 3015 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
3016 | return 0; |
3017 | } | |
3018 | cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION; | |
a1d8b49a | 3019 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 3020 | |
ab78fef4 | 3021 | if (!from_transport) { |
f5a8b3a7 SG |
3022 | int rc; |
3023 | ||
c66ac9db | 3024 | cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE; |
ab78fef4 BVA |
3025 | cmd->scsi_status = SAM_STAT_CHECK_CONDITION; |
3026 | cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER; | |
f5a8b3a7 SG |
3027 | rc = translate_sense_reason(cmd, reason); |
3028 | if (rc) | |
3029 | return rc; | |
c66ac9db | 3030 | } |
c66ac9db | 3031 | |
e5c0d6ad | 3032 | trace_target_cmd_complete(cmd); |
07bde79a | 3033 | return cmd->se_tfo->queue_status(cmd); |
c66ac9db NB |
3034 | } |
3035 | EXPORT_SYMBOL(transport_send_check_condition_and_sense); | |
3036 | ||
310d3d31 NB |
3037 | static int __transport_check_aborted_status(struct se_cmd *cmd, int send_status) |
3038 | __releases(&cmd->t_state_lock) | |
3039 | __acquires(&cmd->t_state_lock) | |
c66ac9db | 3040 | { |
fa7e25cf NB |
3041 | int ret; |
3042 | ||
310d3d31 NB |
3043 | assert_spin_locked(&cmd->t_state_lock); |
3044 | WARN_ON_ONCE(!irqs_disabled()); | |
3045 | ||
c18bc7d8 RD |
3046 | if (!(cmd->transport_state & CMD_T_ABORTED)) |
3047 | return 0; | |
68259b5a AL |
3048 | /* |
3049 | * If cmd has been aborted but either no status is to be sent or it has | |
3050 | * already been sent, just return | |
3051 | */ | |
310d3d31 NB |
3052 | if (!send_status || !(cmd->se_cmd_flags & SCF_SEND_DELAYED_TAS)) { |
3053 | if (send_status) | |
3054 | cmd->se_cmd_flags |= SCF_SEND_DELAYED_TAS; | |
c18bc7d8 | 3055 | return 1; |
310d3d31 | 3056 | } |
8b1e1244 | 3057 | |
310d3d31 NB |
3058 | pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB:" |
3059 | " 0x%02x ITT: 0x%08llx\n", cmd->t_task_cdb[0], cmd->tag); | |
8b1e1244 | 3060 | |
68259b5a | 3061 | cmd->se_cmd_flags &= ~SCF_SEND_DELAYED_TAS; |
29f4c090 | 3062 | cmd->scsi_status = SAM_STAT_TASK_ABORTED; |
e5c0d6ad | 3063 | trace_target_cmd_complete(cmd); |
310d3d31 NB |
3064 | |
3065 | spin_unlock_irq(&cmd->t_state_lock); | |
fa7e25cf NB |
3066 | ret = cmd->se_tfo->queue_status(cmd); |
3067 | if (ret) | |
3068 | transport_handle_queue_full(cmd, cmd->se_dev, ret, false); | |
310d3d31 | 3069 | spin_lock_irq(&cmd->t_state_lock); |
c18bc7d8 RD |
3070 | |
3071 | return 1; | |
c66ac9db | 3072 | } |
310d3d31 NB |
3073 | |
3074 | int transport_check_aborted_status(struct se_cmd *cmd, int send_status) | |
3075 | { | |
3076 | int ret; | |
3077 | ||
3078 | spin_lock_irq(&cmd->t_state_lock); | |
3079 | ret = __transport_check_aborted_status(cmd, send_status); | |
3080 | spin_unlock_irq(&cmd->t_state_lock); | |
3081 | ||
3082 | return ret; | |
3083 | } | |
c66ac9db NB |
3084 | EXPORT_SYMBOL(transport_check_aborted_status); |
3085 | ||
3086 | void transport_send_task_abort(struct se_cmd *cmd) | |
3087 | { | |
c252f003 | 3088 | unsigned long flags; |
fa7e25cf | 3089 | int ret; |
c252f003 NB |
3090 | |
3091 | spin_lock_irqsave(&cmd->t_state_lock, flags); | |
68259b5a | 3092 | if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION)) { |
c252f003 NB |
3093 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
3094 | return; | |
3095 | } | |
3096 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
3097 | ||
c66ac9db NB |
3098 | /* |
3099 | * If there are still expected incoming fabric WRITEs, we wait | |
3100 | * until until they have completed before sending a TASK_ABORTED | |
3101 | * response. This response with TASK_ABORTED status will be | |
3102 | * queued back to fabric module by transport_check_aborted_status(). | |
3103 | */ | |
3104 | if (cmd->data_direction == DMA_TO_DEVICE) { | |
e3d6f909 | 3105 | if (cmd->se_tfo->write_pending_status(cmd) != 0) { |
310d3d31 NB |
3106 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
3107 | if (cmd->se_cmd_flags & SCF_SEND_DELAYED_TAS) { | |
3108 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
3109 | goto send_abort; | |
3110 | } | |
68259b5a | 3111 | cmd->se_cmd_flags |= SCF_SEND_DELAYED_TAS; |
310d3d31 | 3112 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
29f4c090 | 3113 | return; |
c66ac9db NB |
3114 | } |
3115 | } | |
310d3d31 | 3116 | send_abort: |
c66ac9db | 3117 | cmd->scsi_status = SAM_STAT_TASK_ABORTED; |
8b1e1244 | 3118 | |
72b59d6e RD |
3119 | transport_lun_remove_cmd(cmd); |
3120 | ||
649ee054 BVA |
3121 | pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x, ITT: 0x%08llx\n", |
3122 | cmd->t_task_cdb[0], cmd->tag); | |
8b1e1244 | 3123 | |
e5c0d6ad | 3124 | trace_target_cmd_complete(cmd); |
fa7e25cf NB |
3125 | ret = cmd->se_tfo->queue_status(cmd); |
3126 | if (ret) | |
3127 | transport_handle_queue_full(cmd, cmd->se_dev, ret, false); | |
c66ac9db NB |
3128 | } |
3129 | ||
af877292 | 3130 | static void target_tmr_work(struct work_struct *work) |
c66ac9db | 3131 | { |
af877292 | 3132 | struct se_cmd *cmd = container_of(work, struct se_cmd, work); |
5951146d | 3133 | struct se_device *dev = cmd->se_dev; |
c66ac9db | 3134 | struct se_tmr_req *tmr = cmd->se_tmr_req; |
a6d9bb1c | 3135 | unsigned long flags; |
c66ac9db NB |
3136 | int ret; |
3137 | ||
a6d9bb1c NB |
3138 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
3139 | if (cmd->transport_state & CMD_T_ABORTED) { | |
3140 | tmr->response = TMR_FUNCTION_REJECTED; | |
3141 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
3142 | goto check_stop; | |
3143 | } | |
3144 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
3145 | ||
c66ac9db | 3146 | switch (tmr->function) { |
5c6cd613 | 3147 | case TMR_ABORT_TASK: |
3d28934a | 3148 | core_tmr_abort_task(dev, tmr, cmd->se_sess); |
c66ac9db | 3149 | break; |
5c6cd613 NB |
3150 | case TMR_ABORT_TASK_SET: |
3151 | case TMR_CLEAR_ACA: | |
3152 | case TMR_CLEAR_TASK_SET: | |
c66ac9db NB |
3153 | tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED; |
3154 | break; | |
5c6cd613 | 3155 | case TMR_LUN_RESET: |
c66ac9db NB |
3156 | ret = core_tmr_lun_reset(dev, tmr, NULL, NULL); |
3157 | tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE : | |
3158 | TMR_FUNCTION_REJECTED; | |
b5aafb16 HR |
3159 | if (tmr->response == TMR_FUNCTION_COMPLETE) { |
3160 | target_ua_allocate_lun(cmd->se_sess->se_node_acl, | |
3161 | cmd->orig_fe_lun, 0x29, | |
3162 | ASCQ_29H_BUS_DEVICE_RESET_FUNCTION_OCCURRED); | |
3163 | } | |
c66ac9db | 3164 | break; |
5c6cd613 | 3165 | case TMR_TARGET_WARM_RESET: |
c66ac9db NB |
3166 | tmr->response = TMR_FUNCTION_REJECTED; |
3167 | break; | |
5c6cd613 | 3168 | case TMR_TARGET_COLD_RESET: |
c66ac9db NB |
3169 | tmr->response = TMR_FUNCTION_REJECTED; |
3170 | break; | |
c66ac9db | 3171 | default: |
6708bb27 | 3172 | pr_err("Uknown TMR function: 0x%02x.\n", |
c66ac9db NB |
3173 | tmr->function); |
3174 | tmr->response = TMR_FUNCTION_REJECTED; | |
3175 | break; | |
3176 | } | |
3177 | ||
a6d9bb1c NB |
3178 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
3179 | if (cmd->transport_state & CMD_T_ABORTED) { | |
3180 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
3181 | goto check_stop; | |
3182 | } | |
a6d9bb1c NB |
3183 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
3184 | ||
e3d6f909 | 3185 | cmd->se_tfo->queue_tm_rsp(cmd); |
c66ac9db | 3186 | |
a6d9bb1c | 3187 | check_stop: |
b7b8bef7 | 3188 | transport_cmd_check_stop_to_fabric(cmd); |
c66ac9db NB |
3189 | } |
3190 | ||
af877292 CH |
3191 | int transport_generic_handle_tmr( |
3192 | struct se_cmd *cmd) | |
c66ac9db | 3193 | { |
f15e9cd9 | 3194 | unsigned long flags; |
c54eeffb | 3195 | bool aborted = false; |
f15e9cd9 NB |
3196 | |
3197 | spin_lock_irqsave(&cmd->t_state_lock, flags); | |
c54eeffb NB |
3198 | if (cmd->transport_state & CMD_T_ABORTED) { |
3199 | aborted = true; | |
3200 | } else { | |
3201 | cmd->t_state = TRANSPORT_ISTATE_PROCESSING; | |
3202 | cmd->transport_state |= CMD_T_ACTIVE; | |
3203 | } | |
f15e9cd9 NB |
3204 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
3205 | ||
c54eeffb NB |
3206 | if (aborted) { |
3207 | pr_warn_ratelimited("handle_tmr caught CMD_T_ABORTED TMR %d" | |
3208 | "ref_tag: %llu tag: %llu\n", cmd->se_tmr_req->function, | |
3209 | cmd->se_tmr_req->ref_task_tag, cmd->tag); | |
3210 | transport_cmd_check_stop_to_fabric(cmd); | |
3211 | return 0; | |
3212 | } | |
3213 | ||
af877292 CH |
3214 | INIT_WORK(&cmd->work, target_tmr_work); |
3215 | queue_work(cmd->se_dev->tmr_wq, &cmd->work); | |
c66ac9db NB |
3216 | return 0; |
3217 | } | |
af877292 | 3218 | EXPORT_SYMBOL(transport_generic_handle_tmr); |
814e5b45 CH |
3219 | |
3220 | bool | |
3221 | target_check_wce(struct se_device *dev) | |
3222 | { | |
3223 | bool wce = false; | |
3224 | ||
3225 | if (dev->transport->get_write_cache) | |
3226 | wce = dev->transport->get_write_cache(dev); | |
3227 | else if (dev->dev_attrib.emulate_write_cache > 0) | |
3228 | wce = true; | |
3229 | ||
3230 | return wce; | |
3231 | } | |
3232 | ||
3233 | bool | |
3234 | target_check_fua(struct se_device *dev) | |
3235 | { | |
3236 | return target_check_wce(dev) && dev->dev_attrib.emulate_fua_write > 0; | |
3237 | } |