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Commit | Line | Data |
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c66ac9db NB |
1 | /******************************************************************************* |
2 | * Filename: target_core_transport.c | |
3 | * | |
4 | * This file contains the Generic Target Engine Core. | |
5 | * | |
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); |
07bde79a | 67 | static void transport_handle_queue_full(struct se_cmd *cmd, |
e057f533 | 68 | struct se_device *dev); |
d5ddad41 | 69 | static int transport_put_cmd(struct se_cmd *cmd); |
35e0e757 | 70 | static void target_complete_ok_work(struct work_struct *work); |
c66ac9db | 71 | |
e3d6f909 | 72 | int init_se_kmem_caches(void) |
c66ac9db | 73 | { |
c66ac9db NB |
74 | se_sess_cache = kmem_cache_create("se_sess_cache", |
75 | sizeof(struct se_session), __alignof__(struct se_session), | |
76 | 0, NULL); | |
6708bb27 AG |
77 | if (!se_sess_cache) { |
78 | pr_err("kmem_cache_create() for struct se_session" | |
c66ac9db | 79 | " failed\n"); |
c8e31f26 | 80 | goto out; |
c66ac9db NB |
81 | } |
82 | se_ua_cache = kmem_cache_create("se_ua_cache", | |
83 | sizeof(struct se_ua), __alignof__(struct se_ua), | |
84 | 0, NULL); | |
6708bb27 AG |
85 | if (!se_ua_cache) { |
86 | pr_err("kmem_cache_create() for struct se_ua failed\n"); | |
35e0e757 | 87 | goto out_free_sess_cache; |
c66ac9db | 88 | } |
c66ac9db NB |
89 | t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache", |
90 | sizeof(struct t10_pr_registration), | |
91 | __alignof__(struct t10_pr_registration), 0, NULL); | |
6708bb27 AG |
92 | if (!t10_pr_reg_cache) { |
93 | pr_err("kmem_cache_create() for struct t10_pr_registration" | |
c66ac9db | 94 | " failed\n"); |
35e0e757 | 95 | goto out_free_ua_cache; |
c66ac9db NB |
96 | } |
97 | t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache", | |
98 | sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp), | |
99 | 0, NULL); | |
6708bb27 AG |
100 | if (!t10_alua_lu_gp_cache) { |
101 | pr_err("kmem_cache_create() for t10_alua_lu_gp_cache" | |
c66ac9db | 102 | " failed\n"); |
35e0e757 | 103 | goto out_free_pr_reg_cache; |
c66ac9db NB |
104 | } |
105 | t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache", | |
106 | sizeof(struct t10_alua_lu_gp_member), | |
107 | __alignof__(struct t10_alua_lu_gp_member), 0, NULL); | |
6708bb27 AG |
108 | if (!t10_alua_lu_gp_mem_cache) { |
109 | pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_" | |
c66ac9db | 110 | "cache failed\n"); |
35e0e757 | 111 | goto out_free_lu_gp_cache; |
c66ac9db NB |
112 | } |
113 | t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache", | |
114 | sizeof(struct t10_alua_tg_pt_gp), | |
115 | __alignof__(struct t10_alua_tg_pt_gp), 0, NULL); | |
6708bb27 AG |
116 | if (!t10_alua_tg_pt_gp_cache) { |
117 | pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_" | |
c66ac9db | 118 | "cache failed\n"); |
35e0e757 | 119 | goto out_free_lu_gp_mem_cache; |
c66ac9db | 120 | } |
229d4f11 HR |
121 | t10_alua_lba_map_cache = kmem_cache_create( |
122 | "t10_alua_lba_map_cache", | |
123 | sizeof(struct t10_alua_lba_map), | |
124 | __alignof__(struct t10_alua_lba_map), 0, NULL); | |
125 | if (!t10_alua_lba_map_cache) { | |
126 | pr_err("kmem_cache_create() for t10_alua_lba_map_" | |
127 | "cache failed\n"); | |
adf653f9 | 128 | goto out_free_tg_pt_gp_cache; |
229d4f11 HR |
129 | } |
130 | t10_alua_lba_map_mem_cache = kmem_cache_create( | |
131 | "t10_alua_lba_map_mem_cache", | |
132 | sizeof(struct t10_alua_lba_map_member), | |
133 | __alignof__(struct t10_alua_lba_map_member), 0, NULL); | |
134 | if (!t10_alua_lba_map_mem_cache) { | |
135 | pr_err("kmem_cache_create() for t10_alua_lba_map_mem_" | |
136 | "cache failed\n"); | |
137 | goto out_free_lba_map_cache; | |
138 | } | |
c66ac9db | 139 | |
35e0e757 CH |
140 | target_completion_wq = alloc_workqueue("target_completion", |
141 | WQ_MEM_RECLAIM, 0); | |
142 | if (!target_completion_wq) | |
229d4f11 | 143 | goto out_free_lba_map_mem_cache; |
35e0e757 | 144 | |
c66ac9db | 145 | return 0; |
35e0e757 | 146 | |
229d4f11 HR |
147 | out_free_lba_map_mem_cache: |
148 | kmem_cache_destroy(t10_alua_lba_map_mem_cache); | |
149 | out_free_lba_map_cache: | |
150 | kmem_cache_destroy(t10_alua_lba_map_cache); | |
35e0e757 CH |
151 | out_free_tg_pt_gp_cache: |
152 | kmem_cache_destroy(t10_alua_tg_pt_gp_cache); | |
153 | out_free_lu_gp_mem_cache: | |
154 | kmem_cache_destroy(t10_alua_lu_gp_mem_cache); | |
155 | out_free_lu_gp_cache: | |
156 | kmem_cache_destroy(t10_alua_lu_gp_cache); | |
157 | out_free_pr_reg_cache: | |
158 | kmem_cache_destroy(t10_pr_reg_cache); | |
159 | out_free_ua_cache: | |
160 | kmem_cache_destroy(se_ua_cache); | |
161 | out_free_sess_cache: | |
162 | kmem_cache_destroy(se_sess_cache); | |
c66ac9db | 163 | out: |
e3d6f909 | 164 | return -ENOMEM; |
c66ac9db NB |
165 | } |
166 | ||
e3d6f909 | 167 | void release_se_kmem_caches(void) |
c66ac9db | 168 | { |
35e0e757 | 169 | destroy_workqueue(target_completion_wq); |
c66ac9db NB |
170 | kmem_cache_destroy(se_sess_cache); |
171 | kmem_cache_destroy(se_ua_cache); | |
c66ac9db NB |
172 | kmem_cache_destroy(t10_pr_reg_cache); |
173 | kmem_cache_destroy(t10_alua_lu_gp_cache); | |
174 | kmem_cache_destroy(t10_alua_lu_gp_mem_cache); | |
175 | kmem_cache_destroy(t10_alua_tg_pt_gp_cache); | |
229d4f11 HR |
176 | kmem_cache_destroy(t10_alua_lba_map_cache); |
177 | kmem_cache_destroy(t10_alua_lba_map_mem_cache); | |
c66ac9db NB |
178 | } |
179 | ||
e3d6f909 AG |
180 | /* This code ensures unique mib indexes are handed out. */ |
181 | static DEFINE_SPINLOCK(scsi_mib_index_lock); | |
182 | static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX]; | |
e89d15ee NB |
183 | |
184 | /* | |
185 | * Allocate a new row index for the entry type specified | |
186 | */ | |
187 | u32 scsi_get_new_index(scsi_index_t type) | |
188 | { | |
189 | u32 new_index; | |
190 | ||
e3d6f909 | 191 | BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX)); |
e89d15ee | 192 | |
e3d6f909 AG |
193 | spin_lock(&scsi_mib_index_lock); |
194 | new_index = ++scsi_mib_index[type]; | |
195 | spin_unlock(&scsi_mib_index_lock); | |
e89d15ee NB |
196 | |
197 | return new_index; | |
198 | } | |
199 | ||
dbc5623e | 200 | void transport_subsystem_check_init(void) |
c66ac9db NB |
201 | { |
202 | int ret; | |
283669d2 | 203 | static int sub_api_initialized; |
c66ac9db | 204 | |
dbc5623e NB |
205 | if (sub_api_initialized) |
206 | return; | |
207 | ||
c66ac9db NB |
208 | ret = request_module("target_core_iblock"); |
209 | if (ret != 0) | |
6708bb27 | 210 | pr_err("Unable to load target_core_iblock\n"); |
c66ac9db NB |
211 | |
212 | ret = request_module("target_core_file"); | |
213 | if (ret != 0) | |
6708bb27 | 214 | pr_err("Unable to load target_core_file\n"); |
c66ac9db NB |
215 | |
216 | ret = request_module("target_core_pscsi"); | |
217 | if (ret != 0) | |
6708bb27 | 218 | pr_err("Unable to load target_core_pscsi\n"); |
c66ac9db | 219 | |
7c9e7a6f AG |
220 | ret = request_module("target_core_user"); |
221 | if (ret != 0) | |
222 | pr_err("Unable to load target_core_user\n"); | |
223 | ||
e3d6f909 | 224 | sub_api_initialized = 1; |
c66ac9db NB |
225 | } |
226 | ||
e70beee7 | 227 | struct se_session *transport_init_session(enum target_prot_op sup_prot_ops) |
c66ac9db NB |
228 | { |
229 | struct se_session *se_sess; | |
230 | ||
231 | se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL); | |
6708bb27 AG |
232 | if (!se_sess) { |
233 | pr_err("Unable to allocate struct se_session from" | |
c66ac9db NB |
234 | " se_sess_cache\n"); |
235 | return ERR_PTR(-ENOMEM); | |
236 | } | |
237 | INIT_LIST_HEAD(&se_sess->sess_list); | |
238 | INIT_LIST_HEAD(&se_sess->sess_acl_list); | |
a17f091d | 239 | INIT_LIST_HEAD(&se_sess->sess_cmd_list); |
9b31a328 | 240 | INIT_LIST_HEAD(&se_sess->sess_wait_list); |
a17f091d | 241 | spin_lock_init(&se_sess->sess_cmd_lock); |
41ac82b6 | 242 | kref_init(&se_sess->sess_kref); |
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 | ||
e70beee7 | 284 | se_sess = transport_init_session(sup_prot_ops); |
c0add7fd NB |
285 | if (IS_ERR(se_sess)) |
286 | return se_sess; | |
287 | ||
288 | rc = transport_alloc_session_tags(se_sess, tag_num, tag_size); | |
289 | if (rc < 0) { | |
290 | transport_free_session(se_sess); | |
291 | return ERR_PTR(-ENOMEM); | |
292 | } | |
293 | ||
294 | return se_sess; | |
295 | } | |
296 | EXPORT_SYMBOL(transport_init_session_tags); | |
297 | ||
c66ac9db | 298 | /* |
140854cb | 299 | * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called. |
c66ac9db NB |
300 | */ |
301 | void __transport_register_session( | |
302 | struct se_portal_group *se_tpg, | |
303 | struct se_node_acl *se_nacl, | |
304 | struct se_session *se_sess, | |
305 | void *fabric_sess_ptr) | |
306 | { | |
9ac8928e | 307 | const struct target_core_fabric_ops *tfo = se_tpg->se_tpg_tfo; |
c66ac9db NB |
308 | unsigned char buf[PR_REG_ISID_LEN]; |
309 | ||
310 | se_sess->se_tpg = se_tpg; | |
311 | se_sess->fabric_sess_ptr = fabric_sess_ptr; | |
312 | /* | |
313 | * Used by struct se_node_acl's under ConfigFS to locate active se_session-t | |
314 | * | |
315 | * Only set for struct se_session's that will actually be moving I/O. | |
316 | * eg: *NOT* discovery sessions. | |
317 | */ | |
318 | if (se_nacl) { | |
bffb5128 NB |
319 | /* |
320 | * | |
321 | * Determine if fabric allows for T10-PI feature bits exposed to | |
322 | * initiators for device backends with !dev->dev_attrib.pi_prot_type. | |
323 | * | |
324 | * If so, then always save prot_type on a per se_node_acl node | |
325 | * basis and re-instate the previous sess_prot_type to avoid | |
326 | * disabling PI from below any previously initiator side | |
327 | * registered LUNs. | |
328 | */ | |
329 | if (se_nacl->saved_prot_type) | |
330 | se_sess->sess_prot_type = se_nacl->saved_prot_type; | |
331 | else if (tfo->tpg_check_prot_fabric_only) | |
332 | se_sess->sess_prot_type = se_nacl->saved_prot_type = | |
333 | tfo->tpg_check_prot_fabric_only(se_tpg); | |
c66ac9db NB |
334 | /* |
335 | * If the fabric module supports an ISID based TransportID, | |
336 | * save this value in binary from the fabric I_T Nexus now. | |
337 | */ | |
e3d6f909 | 338 | if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { |
c66ac9db | 339 | memset(&buf[0], 0, PR_REG_ISID_LEN); |
e3d6f909 | 340 | se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, |
c66ac9db NB |
341 | &buf[0], PR_REG_ISID_LEN); |
342 | se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]); | |
343 | } | |
afb999ff NB |
344 | kref_get(&se_nacl->acl_kref); |
345 | ||
c66ac9db NB |
346 | spin_lock_irq(&se_nacl->nacl_sess_lock); |
347 | /* | |
348 | * The se_nacl->nacl_sess pointer will be set to the | |
349 | * last active I_T Nexus for each struct se_node_acl. | |
350 | */ | |
351 | se_nacl->nacl_sess = se_sess; | |
352 | ||
353 | list_add_tail(&se_sess->sess_acl_list, | |
354 | &se_nacl->acl_sess_list); | |
355 | spin_unlock_irq(&se_nacl->nacl_sess_lock); | |
356 | } | |
357 | list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list); | |
358 | ||
6708bb27 | 359 | pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n", |
e3d6f909 | 360 | se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr); |
c66ac9db NB |
361 | } |
362 | EXPORT_SYMBOL(__transport_register_session); | |
363 | ||
364 | void transport_register_session( | |
365 | struct se_portal_group *se_tpg, | |
366 | struct se_node_acl *se_nacl, | |
367 | struct se_session *se_sess, | |
368 | void *fabric_sess_ptr) | |
369 | { | |
140854cb NB |
370 | unsigned long flags; |
371 | ||
372 | spin_lock_irqsave(&se_tpg->session_lock, flags); | |
c66ac9db | 373 | __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr); |
140854cb | 374 | spin_unlock_irqrestore(&se_tpg->session_lock, flags); |
c66ac9db NB |
375 | } |
376 | EXPORT_SYMBOL(transport_register_session); | |
377 | ||
ecf0dd66 | 378 | static void target_release_session(struct kref *kref) |
41ac82b6 NB |
379 | { |
380 | struct se_session *se_sess = container_of(kref, | |
381 | struct se_session, sess_kref); | |
382 | struct se_portal_group *se_tpg = se_sess->se_tpg; | |
383 | ||
384 | se_tpg->se_tpg_tfo->close_session(se_sess); | |
385 | } | |
386 | ||
387 | void target_get_session(struct se_session *se_sess) | |
388 | { | |
389 | kref_get(&se_sess->sess_kref); | |
390 | } | |
391 | EXPORT_SYMBOL(target_get_session); | |
392 | ||
33933a0e | 393 | void target_put_session(struct se_session *se_sess) |
41ac82b6 | 394 | { |
33933a0e | 395 | kref_put(&se_sess->sess_kref, target_release_session); |
41ac82b6 NB |
396 | } |
397 | EXPORT_SYMBOL(target_put_session); | |
398 | ||
f8e471f9 NB |
399 | ssize_t target_show_dynamic_sessions(struct se_portal_group *se_tpg, char *page) |
400 | { | |
401 | struct se_session *se_sess; | |
402 | ssize_t len = 0; | |
403 | ||
404 | spin_lock_bh(&se_tpg->session_lock); | |
405 | list_for_each_entry(se_sess, &se_tpg->tpg_sess_list, sess_list) { | |
406 | if (!se_sess->se_node_acl) | |
407 | continue; | |
408 | if (!se_sess->se_node_acl->dynamic_node_acl) | |
409 | continue; | |
410 | if (strlen(se_sess->se_node_acl->initiatorname) + 1 + len > PAGE_SIZE) | |
411 | break; | |
412 | ||
413 | len += snprintf(page + len, PAGE_SIZE - len, "%s\n", | |
414 | se_sess->se_node_acl->initiatorname); | |
415 | len += 1; /* Include NULL terminator */ | |
416 | } | |
417 | spin_unlock_bh(&se_tpg->session_lock); | |
418 | ||
419 | return len; | |
420 | } | |
421 | EXPORT_SYMBOL(target_show_dynamic_sessions); | |
422 | ||
afb999ff NB |
423 | static void target_complete_nacl(struct kref *kref) |
424 | { | |
425 | struct se_node_acl *nacl = container_of(kref, | |
426 | struct se_node_acl, acl_kref); | |
427 | ||
428 | complete(&nacl->acl_free_comp); | |
429 | } | |
430 | ||
431 | void target_put_nacl(struct se_node_acl *nacl) | |
432 | { | |
433 | kref_put(&nacl->acl_kref, target_complete_nacl); | |
434 | } | |
435 | ||
c66ac9db NB |
436 | void transport_deregister_session_configfs(struct se_session *se_sess) |
437 | { | |
438 | struct se_node_acl *se_nacl; | |
23388864 | 439 | unsigned long flags; |
c66ac9db NB |
440 | /* |
441 | * Used by struct se_node_acl's under ConfigFS to locate active struct se_session | |
442 | */ | |
443 | se_nacl = se_sess->se_node_acl; | |
6708bb27 | 444 | if (se_nacl) { |
23388864 | 445 | spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags); |
337c0607 NB |
446 | if (se_nacl->acl_stop == 0) |
447 | list_del(&se_sess->sess_acl_list); | |
c66ac9db NB |
448 | /* |
449 | * If the session list is empty, then clear the pointer. | |
450 | * Otherwise, set the struct se_session pointer from the tail | |
451 | * element of the per struct se_node_acl active session list. | |
452 | */ | |
453 | if (list_empty(&se_nacl->acl_sess_list)) | |
454 | se_nacl->nacl_sess = NULL; | |
455 | else { | |
456 | se_nacl->nacl_sess = container_of( | |
457 | se_nacl->acl_sess_list.prev, | |
458 | struct se_session, sess_acl_list); | |
459 | } | |
23388864 | 460 | spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags); |
c66ac9db NB |
461 | } |
462 | } | |
463 | EXPORT_SYMBOL(transport_deregister_session_configfs); | |
464 | ||
465 | void transport_free_session(struct se_session *se_sess) | |
466 | { | |
c0add7fd NB |
467 | if (se_sess->sess_cmd_map) { |
468 | percpu_ida_destroy(&se_sess->sess_tag_pool); | |
de64d3a6 | 469 | kvfree(se_sess->sess_cmd_map); |
c0add7fd | 470 | } |
c66ac9db NB |
471 | kmem_cache_free(se_sess_cache, se_sess); |
472 | } | |
473 | EXPORT_SYMBOL(transport_free_session); | |
474 | ||
475 | void transport_deregister_session(struct se_session *se_sess) | |
476 | { | |
477 | struct se_portal_group *se_tpg = se_sess->se_tpg; | |
9ac8928e | 478 | const struct target_core_fabric_ops *se_tfo; |
c66ac9db | 479 | struct se_node_acl *se_nacl; |
e63a8e19 | 480 | unsigned long flags; |
403edd78 | 481 | bool comp_nacl = true, drop_nacl = false; |
c66ac9db | 482 | |
6708bb27 | 483 | if (!se_tpg) { |
c66ac9db NB |
484 | transport_free_session(se_sess); |
485 | return; | |
486 | } | |
01468346 | 487 | se_tfo = se_tpg->se_tpg_tfo; |
c66ac9db | 488 | |
e63a8e19 | 489 | spin_lock_irqsave(&se_tpg->session_lock, flags); |
c66ac9db NB |
490 | list_del(&se_sess->sess_list); |
491 | se_sess->se_tpg = NULL; | |
492 | se_sess->fabric_sess_ptr = NULL; | |
e63a8e19 | 493 | spin_unlock_irqrestore(&se_tpg->session_lock, flags); |
c66ac9db NB |
494 | |
495 | /* | |
496 | * Determine if we need to do extra work for this initiator node's | |
497 | * struct se_node_acl if it had been previously dynamically generated. | |
498 | */ | |
499 | se_nacl = se_sess->se_node_acl; | |
01468346 | 500 | |
403edd78 | 501 | mutex_lock(&se_tpg->acl_node_mutex); |
01468346 NB |
502 | if (se_nacl && se_nacl->dynamic_node_acl) { |
503 | if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) { | |
504 | list_del(&se_nacl->acl_list); | |
505 | se_tpg->num_node_acls--; | |
403edd78 | 506 | drop_nacl = true; |
c66ac9db | 507 | } |
c66ac9db | 508 | } |
403edd78 | 509 | mutex_unlock(&se_tpg->acl_node_mutex); |
c66ac9db | 510 | |
403edd78 NB |
511 | if (drop_nacl) { |
512 | core_tpg_wait_for_nacl_pr_ref(se_nacl); | |
513 | core_free_device_list_for_node(se_nacl, se_tpg); | |
514 | kfree(se_nacl); | |
515 | comp_nacl = false; | |
516 | } | |
6708bb27 | 517 | pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n", |
e3d6f909 | 518 | se_tpg->se_tpg_tfo->get_fabric_name()); |
01468346 | 519 | /* |
125d0119 | 520 | * If last kref is dropping now for an explicit NodeACL, awake sleeping |
afb999ff NB |
521 | * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group |
522 | * removal context. | |
01468346 | 523 | */ |
0bcc297e | 524 | if (se_nacl && comp_nacl) |
afb999ff | 525 | target_put_nacl(se_nacl); |
01468346 | 526 | |
afb999ff | 527 | transport_free_session(se_sess); |
c66ac9db NB |
528 | } |
529 | EXPORT_SYMBOL(transport_deregister_session); | |
530 | ||
531 | /* | |
a1d8b49a | 532 | * Called with cmd->t_state_lock held. |
c66ac9db | 533 | */ |
cf572a96 | 534 | static void target_remove_from_state_list(struct se_cmd *cmd) |
c66ac9db | 535 | { |
42bf829e | 536 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
537 | unsigned long flags; |
538 | ||
42bf829e CH |
539 | if (!dev) |
540 | return; | |
c66ac9db | 541 | |
cf572a96 CH |
542 | if (cmd->transport_state & CMD_T_BUSY) |
543 | return; | |
c66ac9db | 544 | |
cf572a96 CH |
545 | spin_lock_irqsave(&dev->execute_task_lock, flags); |
546 | if (cmd->state_active) { | |
547 | list_del(&cmd->state_list); | |
cf572a96 | 548 | cmd->state_active = false; |
c66ac9db | 549 | } |
cf572a96 | 550 | spin_unlock_irqrestore(&dev->execute_task_lock, flags); |
c66ac9db NB |
551 | } |
552 | ||
862e6389 NB |
553 | static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists, |
554 | bool write_pending) | |
c66ac9db NB |
555 | { |
556 | unsigned long flags; | |
557 | ||
a1d8b49a | 558 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
862e6389 NB |
559 | if (write_pending) |
560 | cmd->t_state = TRANSPORT_WRITE_PENDING; | |
561 | ||
f7113a47 CH |
562 | if (remove_from_lists) { |
563 | target_remove_from_state_list(cmd); | |
564 | ||
565 | /* | |
566 | * Clear struct se_cmd->se_lun before the handoff to FE. | |
567 | */ | |
568 | cmd->se_lun = NULL; | |
569 | } | |
570 | ||
c66ac9db NB |
571 | /* |
572 | * Determine if frontend context caller is requesting the stopping of | |
e3d6f909 | 573 | * this command for frontend exceptions. |
c66ac9db | 574 | */ |
7d680f3b | 575 | if (cmd->transport_state & CMD_T_STOP) { |
649ee054 BVA |
576 | pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n", |
577 | __func__, __LINE__, cmd->tag); | |
c66ac9db | 578 | |
a1d8b49a | 579 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 580 | |
a95d6511 | 581 | complete_all(&cmd->t_transport_stop_comp); |
c66ac9db NB |
582 | return 1; |
583 | } | |
f7113a47 CH |
584 | |
585 | cmd->transport_state &= ~CMD_T_ACTIVE; | |
586 | if (remove_from_lists) { | |
587 | /* | |
588 | * Some fabric modules like tcm_loop can release | |
589 | * their internally allocated I/O reference now and | |
590 | * struct se_cmd now. | |
591 | * | |
592 | * Fabric modules are expected to return '1' here if the | |
593 | * se_cmd being passed is released at this point, | |
594 | * or zero if not being released. | |
595 | */ | |
596 | if (cmd->se_tfo->check_stop_free != NULL) { | |
597 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
598 | return cmd->se_tfo->check_stop_free(cmd); | |
c66ac9db | 599 | } |
f7113a47 | 600 | } |
c66ac9db | 601 | |
a1d8b49a | 602 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
603 | return 0; |
604 | } | |
605 | ||
606 | static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd) | |
607 | { | |
862e6389 | 608 | return transport_cmd_check_stop(cmd, true, false); |
c66ac9db NB |
609 | } |
610 | ||
611 | static void transport_lun_remove_cmd(struct se_cmd *cmd) | |
612 | { | |
e3d6f909 | 613 | struct se_lun *lun = cmd->se_lun; |
c66ac9db | 614 | |
5259a06e | 615 | if (!lun) |
c66ac9db NB |
616 | return; |
617 | ||
5259a06e NB |
618 | if (cmpxchg(&cmd->lun_ref_active, true, false)) |
619 | percpu_ref_put(&lun->lun_ref); | |
c66ac9db NB |
620 | } |
621 | ||
622 | void transport_cmd_finish_abort(struct se_cmd *cmd, int remove) | |
623 | { | |
68259b5a AL |
624 | if (cmd->se_cmd_flags & SCF_SE_LUN_CMD) |
625 | transport_lun_remove_cmd(cmd); | |
131e6abc NB |
626 | /* |
627 | * Allow the fabric driver to unmap any resources before | |
628 | * releasing the descriptor via TFO->release_cmd() | |
629 | */ | |
630 | if (remove) | |
631 | cmd->se_tfo->aborted_task(cmd); | |
68259b5a | 632 | |
c66ac9db NB |
633 | if (transport_cmd_check_stop_to_fabric(cmd)) |
634 | return; | |
af877292 | 635 | if (remove) |
e6a2573f | 636 | transport_put_cmd(cmd); |
c66ac9db NB |
637 | } |
638 | ||
35e0e757 CH |
639 | static void target_complete_failure_work(struct work_struct *work) |
640 | { | |
641 | struct se_cmd *cmd = container_of(work, struct se_cmd, work); | |
642 | ||
de103c93 CH |
643 | transport_generic_request_failure(cmd, |
644 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE); | |
35e0e757 CH |
645 | } |
646 | ||
6138ed2a | 647 | /* |
d5829eac PB |
648 | * Used when asking transport to copy Sense Data from the underlying |
649 | * Linux/SCSI struct scsi_cmnd | |
6138ed2a | 650 | */ |
d5829eac | 651 | static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd) |
6138ed2a | 652 | { |
6138ed2a | 653 | struct se_device *dev = cmd->se_dev; |
6138ed2a PB |
654 | |
655 | WARN_ON(!cmd->se_lun); | |
656 | ||
657 | if (!dev) | |
d5829eac | 658 | return NULL; |
6138ed2a | 659 | |
d5829eac PB |
660 | if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) |
661 | return NULL; | |
6138ed2a | 662 | |
9c58b7dd | 663 | cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER; |
6138ed2a | 664 | |
d5829eac | 665 | pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n", |
6138ed2a | 666 | dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status); |
9c58b7dd | 667 | return cmd->sense_buffer; |
6138ed2a PB |
668 | } |
669 | ||
5787cacd | 670 | void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status) |
c66ac9db | 671 | { |
42bf829e | 672 | struct se_device *dev = cmd->se_dev; |
5787cacd | 673 | int success = scsi_status == GOOD; |
c66ac9db | 674 | unsigned long flags; |
c66ac9db | 675 | |
5787cacd CH |
676 | cmd->scsi_status = scsi_status; |
677 | ||
678 | ||
a1d8b49a | 679 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
cf572a96 | 680 | cmd->transport_state &= ~CMD_T_BUSY; |
c66ac9db | 681 | |
c66ac9db | 682 | if (dev && dev->transport->transport_complete) { |
d5829eac PB |
683 | dev->transport->transport_complete(cmd, |
684 | cmd->t_data_sg, | |
685 | transport_get_sense_buffer(cmd)); | |
686 | if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) | |
c66ac9db | 687 | success = 1; |
c66ac9db NB |
688 | } |
689 | ||
690 | /* | |
5787cacd | 691 | * See if we are waiting to complete for an exception condition. |
c66ac9db | 692 | */ |
cf572a96 | 693 | if (cmd->transport_state & CMD_T_REQUEST_STOP) { |
a1d8b49a | 694 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
cf572a96 | 695 | complete(&cmd->task_stop_comp); |
c66ac9db NB |
696 | return; |
697 | } | |
2235007c | 698 | |
3d28934a | 699 | /* |
125d0119 | 700 | * Check for case where an explicit ABORT_TASK has been received |
3d28934a NB |
701 | * and transport_wait_for_tasks() will be waiting for completion.. |
702 | */ | |
703 | if (cmd->transport_state & CMD_T_ABORTED && | |
704 | cmd->transport_state & CMD_T_STOP) { | |
705 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
a95d6511 | 706 | complete_all(&cmd->t_transport_stop_comp); |
3d28934a | 707 | return; |
3dca1471 | 708 | } else if (!success) { |
35e0e757 | 709 | INIT_WORK(&cmd->work, target_complete_failure_work); |
c66ac9db | 710 | } else { |
35e0e757 | 711 | INIT_WORK(&cmd->work, target_complete_ok_work); |
c66ac9db | 712 | } |
35e0e757 | 713 | |
35e0e757 | 714 | cmd->t_state = TRANSPORT_COMPLETE; |
3d28934a | 715 | cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE); |
a1d8b49a | 716 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 717 | |
35e0e757 | 718 | queue_work(target_completion_wq, &cmd->work); |
c66ac9db | 719 | } |
6bb35e00 CH |
720 | EXPORT_SYMBOL(target_complete_cmd); |
721 | ||
2426bd45 RD |
722 | void target_complete_cmd_with_length(struct se_cmd *cmd, u8 scsi_status, int length) |
723 | { | |
724 | if (scsi_status == SAM_STAT_GOOD && length < cmd->data_length) { | |
725 | if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) { | |
726 | cmd->residual_count += cmd->data_length - length; | |
727 | } else { | |
728 | cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT; | |
729 | cmd->residual_count = cmd->data_length - length; | |
730 | } | |
731 | ||
732 | cmd->data_length = length; | |
733 | } | |
734 | ||
735 | target_complete_cmd(cmd, scsi_status); | |
736 | } | |
737 | EXPORT_SYMBOL(target_complete_cmd_with_length); | |
738 | ||
cf572a96 | 739 | static void target_add_to_state_list(struct se_cmd *cmd) |
c66ac9db | 740 | { |
cf572a96 CH |
741 | struct se_device *dev = cmd->se_dev; |
742 | unsigned long flags; | |
c66ac9db | 743 | |
cf572a96 CH |
744 | spin_lock_irqsave(&dev->execute_task_lock, flags); |
745 | if (!cmd->state_active) { | |
746 | list_add_tail(&cmd->state_list, &dev->state_list); | |
747 | cmd->state_active = true; | |
c66ac9db | 748 | } |
cf572a96 | 749 | spin_unlock_irqrestore(&dev->execute_task_lock, flags); |
c66ac9db NB |
750 | } |
751 | ||
07bde79a | 752 | /* |
f147abb4 | 753 | * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status |
07bde79a | 754 | */ |
7a6f0a1e CH |
755 | static void transport_write_pending_qf(struct se_cmd *cmd); |
756 | static void transport_complete_qf(struct se_cmd *cmd); | |
07bde79a | 757 | |
0fd97ccf | 758 | void target_qf_do_work(struct work_struct *work) |
07bde79a NB |
759 | { |
760 | struct se_device *dev = container_of(work, struct se_device, | |
761 | qf_work_queue); | |
bcac364a | 762 | LIST_HEAD(qf_cmd_list); |
07bde79a NB |
763 | struct se_cmd *cmd, *cmd_tmp; |
764 | ||
765 | spin_lock_irq(&dev->qf_cmd_lock); | |
bcac364a RD |
766 | list_splice_init(&dev->qf_cmd_list, &qf_cmd_list); |
767 | spin_unlock_irq(&dev->qf_cmd_lock); | |
07bde79a | 768 | |
bcac364a | 769 | list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) { |
07bde79a | 770 | list_del(&cmd->se_qf_node); |
33940d09 | 771 | atomic_dec_mb(&dev->dev_qf_count); |
07bde79a | 772 | |
6708bb27 | 773 | pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue" |
07bde79a | 774 | " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd, |
e057f533 | 775 | (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" : |
07bde79a NB |
776 | (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING" |
777 | : "UNKNOWN"); | |
f7a5cc0b | 778 | |
7a6f0a1e CH |
779 | if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) |
780 | transport_write_pending_qf(cmd); | |
781 | else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) | |
782 | transport_complete_qf(cmd); | |
07bde79a | 783 | } |
07bde79a NB |
784 | } |
785 | ||
c66ac9db NB |
786 | unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd) |
787 | { | |
788 | switch (cmd->data_direction) { | |
789 | case DMA_NONE: | |
790 | return "NONE"; | |
791 | case DMA_FROM_DEVICE: | |
792 | return "READ"; | |
793 | case DMA_TO_DEVICE: | |
794 | return "WRITE"; | |
795 | case DMA_BIDIRECTIONAL: | |
796 | return "BIDI"; | |
797 | default: | |
798 | break; | |
799 | } | |
800 | ||
801 | return "UNKNOWN"; | |
802 | } | |
803 | ||
804 | void transport_dump_dev_state( | |
805 | struct se_device *dev, | |
806 | char *b, | |
807 | int *bl) | |
808 | { | |
809 | *bl += sprintf(b + *bl, "Status: "); | |
0fd97ccf | 810 | if (dev->export_count) |
c66ac9db | 811 | *bl += sprintf(b + *bl, "ACTIVATED"); |
0fd97ccf | 812 | else |
c66ac9db | 813 | *bl += sprintf(b + *bl, "DEACTIVATED"); |
c66ac9db | 814 | |
5f41a31d | 815 | *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth); |
11e764bd | 816 | *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n", |
0fd97ccf CH |
817 | dev->dev_attrib.block_size, |
818 | dev->dev_attrib.hw_max_sectors); | |
c66ac9db NB |
819 | *bl += sprintf(b + *bl, " "); |
820 | } | |
821 | ||
c66ac9db NB |
822 | void transport_dump_vpd_proto_id( |
823 | struct t10_vpd *vpd, | |
824 | unsigned char *p_buf, | |
825 | int p_buf_len) | |
826 | { | |
827 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
828 | int len; | |
829 | ||
830 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
831 | len = sprintf(buf, "T10 VPD Protocol Identifier: "); | |
832 | ||
833 | switch (vpd->protocol_identifier) { | |
834 | case 0x00: | |
835 | sprintf(buf+len, "Fibre Channel\n"); | |
836 | break; | |
837 | case 0x10: | |
838 | sprintf(buf+len, "Parallel SCSI\n"); | |
839 | break; | |
840 | case 0x20: | |
841 | sprintf(buf+len, "SSA\n"); | |
842 | break; | |
843 | case 0x30: | |
844 | sprintf(buf+len, "IEEE 1394\n"); | |
845 | break; | |
846 | case 0x40: | |
847 | sprintf(buf+len, "SCSI Remote Direct Memory Access" | |
848 | " Protocol\n"); | |
849 | break; | |
850 | case 0x50: | |
851 | sprintf(buf+len, "Internet SCSI (iSCSI)\n"); | |
852 | break; | |
853 | case 0x60: | |
854 | sprintf(buf+len, "SAS Serial SCSI Protocol\n"); | |
855 | break; | |
856 | case 0x70: | |
857 | sprintf(buf+len, "Automation/Drive Interface Transport" | |
858 | " Protocol\n"); | |
859 | break; | |
860 | case 0x80: | |
861 | sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n"); | |
862 | break; | |
863 | default: | |
864 | sprintf(buf+len, "Unknown 0x%02x\n", | |
865 | vpd->protocol_identifier); | |
866 | break; | |
867 | } | |
868 | ||
869 | if (p_buf) | |
870 | strncpy(p_buf, buf, p_buf_len); | |
871 | else | |
6708bb27 | 872 | pr_debug("%s", buf); |
c66ac9db NB |
873 | } |
874 | ||
875 | void | |
876 | transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83) | |
877 | { | |
878 | /* | |
879 | * Check if the Protocol Identifier Valid (PIV) bit is set.. | |
880 | * | |
881 | * from spc3r23.pdf section 7.5.1 | |
882 | */ | |
883 | if (page_83[1] & 0x80) { | |
884 | vpd->protocol_identifier = (page_83[0] & 0xf0); | |
885 | vpd->protocol_identifier_set = 1; | |
886 | transport_dump_vpd_proto_id(vpd, NULL, 0); | |
887 | } | |
888 | } | |
889 | EXPORT_SYMBOL(transport_set_vpd_proto_id); | |
890 | ||
891 | int transport_dump_vpd_assoc( | |
892 | struct t10_vpd *vpd, | |
893 | unsigned char *p_buf, | |
894 | int p_buf_len) | |
895 | { | |
896 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
e3d6f909 AG |
897 | int ret = 0; |
898 | int len; | |
c66ac9db NB |
899 | |
900 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
901 | len = sprintf(buf, "T10 VPD Identifier Association: "); | |
902 | ||
903 | switch (vpd->association) { | |
904 | case 0x00: | |
905 | sprintf(buf+len, "addressed logical unit\n"); | |
906 | break; | |
907 | case 0x10: | |
908 | sprintf(buf+len, "target port\n"); | |
909 | break; | |
910 | case 0x20: | |
911 | sprintf(buf+len, "SCSI target device\n"); | |
912 | break; | |
913 | default: | |
914 | sprintf(buf+len, "Unknown 0x%02x\n", vpd->association); | |
e3d6f909 | 915 | ret = -EINVAL; |
c66ac9db NB |
916 | break; |
917 | } | |
918 | ||
919 | if (p_buf) | |
920 | strncpy(p_buf, buf, p_buf_len); | |
921 | else | |
6708bb27 | 922 | pr_debug("%s", buf); |
c66ac9db NB |
923 | |
924 | return ret; | |
925 | } | |
926 | ||
927 | int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83) | |
928 | { | |
929 | /* | |
930 | * The VPD identification association.. | |
931 | * | |
932 | * from spc3r23.pdf Section 7.6.3.1 Table 297 | |
933 | */ | |
934 | vpd->association = (page_83[1] & 0x30); | |
935 | return transport_dump_vpd_assoc(vpd, NULL, 0); | |
936 | } | |
937 | EXPORT_SYMBOL(transport_set_vpd_assoc); | |
938 | ||
939 | int transport_dump_vpd_ident_type( | |
940 | struct t10_vpd *vpd, | |
941 | unsigned char *p_buf, | |
942 | int p_buf_len) | |
943 | { | |
944 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
e3d6f909 AG |
945 | int ret = 0; |
946 | int len; | |
c66ac9db NB |
947 | |
948 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
949 | len = sprintf(buf, "T10 VPD Identifier Type: "); | |
950 | ||
951 | switch (vpd->device_identifier_type) { | |
952 | case 0x00: | |
953 | sprintf(buf+len, "Vendor specific\n"); | |
954 | break; | |
955 | case 0x01: | |
956 | sprintf(buf+len, "T10 Vendor ID based\n"); | |
957 | break; | |
958 | case 0x02: | |
959 | sprintf(buf+len, "EUI-64 based\n"); | |
960 | break; | |
961 | case 0x03: | |
962 | sprintf(buf+len, "NAA\n"); | |
963 | break; | |
964 | case 0x04: | |
965 | sprintf(buf+len, "Relative target port identifier\n"); | |
966 | break; | |
967 | case 0x08: | |
968 | sprintf(buf+len, "SCSI name string\n"); | |
969 | break; | |
970 | default: | |
971 | sprintf(buf+len, "Unsupported: 0x%02x\n", | |
972 | vpd->device_identifier_type); | |
e3d6f909 | 973 | ret = -EINVAL; |
c66ac9db NB |
974 | break; |
975 | } | |
976 | ||
e3d6f909 AG |
977 | if (p_buf) { |
978 | if (p_buf_len < strlen(buf)+1) | |
979 | return -EINVAL; | |
c66ac9db | 980 | strncpy(p_buf, buf, p_buf_len); |
e3d6f909 | 981 | } else { |
6708bb27 | 982 | pr_debug("%s", buf); |
e3d6f909 | 983 | } |
c66ac9db NB |
984 | |
985 | return ret; | |
986 | } | |
987 | ||
988 | int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83) | |
989 | { | |
990 | /* | |
991 | * The VPD identifier type.. | |
992 | * | |
993 | * from spc3r23.pdf Section 7.6.3.1 Table 298 | |
994 | */ | |
995 | vpd->device_identifier_type = (page_83[1] & 0x0f); | |
996 | return transport_dump_vpd_ident_type(vpd, NULL, 0); | |
997 | } | |
998 | EXPORT_SYMBOL(transport_set_vpd_ident_type); | |
999 | ||
1000 | int transport_dump_vpd_ident( | |
1001 | struct t10_vpd *vpd, | |
1002 | unsigned char *p_buf, | |
1003 | int p_buf_len) | |
1004 | { | |
1005 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
1006 | int ret = 0; | |
1007 | ||
1008 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
1009 | ||
1010 | switch (vpd->device_identifier_code_set) { | |
1011 | case 0x01: /* Binary */ | |
703d641d DC |
1012 | snprintf(buf, sizeof(buf), |
1013 | "T10 VPD Binary Device Identifier: %s\n", | |
c66ac9db NB |
1014 | &vpd->device_identifier[0]); |
1015 | break; | |
1016 | case 0x02: /* ASCII */ | |
703d641d DC |
1017 | snprintf(buf, sizeof(buf), |
1018 | "T10 VPD ASCII Device Identifier: %s\n", | |
c66ac9db NB |
1019 | &vpd->device_identifier[0]); |
1020 | break; | |
1021 | case 0x03: /* UTF-8 */ | |
703d641d DC |
1022 | snprintf(buf, sizeof(buf), |
1023 | "T10 VPD UTF-8 Device Identifier: %s\n", | |
c66ac9db NB |
1024 | &vpd->device_identifier[0]); |
1025 | break; | |
1026 | default: | |
1027 | sprintf(buf, "T10 VPD Device Identifier encoding unsupported:" | |
1028 | " 0x%02x", vpd->device_identifier_code_set); | |
e3d6f909 | 1029 | ret = -EINVAL; |
c66ac9db NB |
1030 | break; |
1031 | } | |
1032 | ||
1033 | if (p_buf) | |
1034 | strncpy(p_buf, buf, p_buf_len); | |
1035 | else | |
6708bb27 | 1036 | pr_debug("%s", buf); |
c66ac9db NB |
1037 | |
1038 | return ret; | |
1039 | } | |
1040 | ||
1041 | int | |
1042 | transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83) | |
1043 | { | |
1044 | static const char hex_str[] = "0123456789abcdef"; | |
35d1efe8 | 1045 | int j = 0, i = 4; /* offset to start of the identifier */ |
c66ac9db NB |
1046 | |
1047 | /* | |
1048 | * The VPD Code Set (encoding) | |
1049 | * | |
1050 | * from spc3r23.pdf Section 7.6.3.1 Table 296 | |
1051 | */ | |
1052 | vpd->device_identifier_code_set = (page_83[0] & 0x0f); | |
1053 | switch (vpd->device_identifier_code_set) { | |
1054 | case 0x01: /* Binary */ | |
1055 | vpd->device_identifier[j++] = | |
1056 | hex_str[vpd->device_identifier_type]; | |
1057 | while (i < (4 + page_83[3])) { | |
1058 | vpd->device_identifier[j++] = | |
1059 | hex_str[(page_83[i] & 0xf0) >> 4]; | |
1060 | vpd->device_identifier[j++] = | |
1061 | hex_str[page_83[i] & 0x0f]; | |
1062 | i++; | |
1063 | } | |
1064 | break; | |
1065 | case 0x02: /* ASCII */ | |
1066 | case 0x03: /* UTF-8 */ | |
1067 | while (i < (4 + page_83[3])) | |
1068 | vpd->device_identifier[j++] = page_83[i++]; | |
1069 | break; | |
1070 | default: | |
1071 | break; | |
1072 | } | |
1073 | ||
1074 | return transport_dump_vpd_ident(vpd, NULL, 0); | |
1075 | } | |
1076 | EXPORT_SYMBOL(transport_set_vpd_ident); | |
1077 | ||
de103c93 CH |
1078 | sense_reason_t |
1079 | target_cmd_size_check(struct se_cmd *cmd, unsigned int size) | |
9b3b8041 CH |
1080 | { |
1081 | struct se_device *dev = cmd->se_dev; | |
1082 | ||
1083 | if (cmd->unknown_data_length) { | |
1084 | cmd->data_length = size; | |
1085 | } else if (size != cmd->data_length) { | |
1086 | pr_warn("TARGET_CORE[%s]: Expected Transfer Length:" | |
1087 | " %u does not match SCSI CDB Length: %u for SAM Opcode:" | |
1088 | " 0x%02x\n", cmd->se_tfo->get_fabric_name(), | |
1089 | cmd->data_length, size, cmd->t_task_cdb[0]); | |
1090 | ||
c72c5250 RD |
1091 | if (cmd->data_direction == DMA_TO_DEVICE && |
1092 | cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) { | |
1093 | pr_err("Rejecting underflow/overflow WRITE data\n"); | |
de103c93 | 1094 | return TCM_INVALID_CDB_FIELD; |
9b3b8041 CH |
1095 | } |
1096 | /* | |
1097 | * Reject READ_* or WRITE_* with overflow/underflow for | |
1098 | * type SCF_SCSI_DATA_CDB. | |
1099 | */ | |
0fd97ccf | 1100 | if (dev->dev_attrib.block_size != 512) { |
9b3b8041 CH |
1101 | pr_err("Failing OVERFLOW/UNDERFLOW for LBA op" |
1102 | " CDB on non 512-byte sector setup subsystem" | |
1103 | " plugin: %s\n", dev->transport->name); | |
1104 | /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */ | |
de103c93 | 1105 | return TCM_INVALID_CDB_FIELD; |
9b3b8041 | 1106 | } |
4c054ba6 NB |
1107 | /* |
1108 | * For the overflow case keep the existing fabric provided | |
1109 | * ->data_length. Otherwise for the underflow case, reset | |
1110 | * ->data_length to the smaller SCSI expected data transfer | |
1111 | * length. | |
1112 | */ | |
9b3b8041 CH |
1113 | if (size > cmd->data_length) { |
1114 | cmd->se_cmd_flags |= SCF_OVERFLOW_BIT; | |
1115 | cmd->residual_count = (size - cmd->data_length); | |
1116 | } else { | |
1117 | cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT; | |
1118 | cmd->residual_count = (cmd->data_length - size); | |
4c054ba6 | 1119 | cmd->data_length = size; |
9b3b8041 | 1120 | } |
9b3b8041 CH |
1121 | } |
1122 | ||
1123 | return 0; | |
1124 | ||
9b3b8041 CH |
1125 | } |
1126 | ||
c66ac9db NB |
1127 | /* |
1128 | * Used by fabric modules containing a local struct se_cmd within their | |
1129 | * fabric dependent per I/O descriptor. | |
649ee054 BVA |
1130 | * |
1131 | * Preserves the value of @cmd->tag. | |
c66ac9db NB |
1132 | */ |
1133 | void transport_init_se_cmd( | |
1134 | struct se_cmd *cmd, | |
9ac8928e | 1135 | const struct target_core_fabric_ops *tfo, |
c66ac9db NB |
1136 | struct se_session *se_sess, |
1137 | u32 data_length, | |
1138 | int data_direction, | |
1139 | int task_attr, | |
1140 | unsigned char *sense_buffer) | |
1141 | { | |
5951146d | 1142 | INIT_LIST_HEAD(&cmd->se_delayed_node); |
07bde79a | 1143 | INIT_LIST_HEAD(&cmd->se_qf_node); |
a17f091d | 1144 | INIT_LIST_HEAD(&cmd->se_cmd_list); |
cf572a96 | 1145 | INIT_LIST_HEAD(&cmd->state_list); |
a1d8b49a | 1146 | init_completion(&cmd->t_transport_stop_comp); |
a17f091d | 1147 | init_completion(&cmd->cmd_wait_comp); |
cf572a96 | 1148 | init_completion(&cmd->task_stop_comp); |
a1d8b49a | 1149 | spin_lock_init(&cmd->t_state_lock); |
1e1110c4 | 1150 | kref_init(&cmd->cmd_kref); |
7d680f3b | 1151 | cmd->transport_state = CMD_T_DEV_ACTIVE; |
c66ac9db NB |
1152 | |
1153 | cmd->se_tfo = tfo; | |
1154 | cmd->se_sess = se_sess; | |
1155 | cmd->data_length = data_length; | |
1156 | cmd->data_direction = data_direction; | |
1157 | cmd->sam_task_attr = task_attr; | |
1158 | cmd->sense_buffer = sense_buffer; | |
cf572a96 CH |
1159 | |
1160 | cmd->state_active = false; | |
c66ac9db NB |
1161 | } |
1162 | EXPORT_SYMBOL(transport_init_se_cmd); | |
1163 | ||
de103c93 CH |
1164 | static sense_reason_t |
1165 | transport_check_alloc_task_attr(struct se_cmd *cmd) | |
c66ac9db | 1166 | { |
019c4ca6 CH |
1167 | struct se_device *dev = cmd->se_dev; |
1168 | ||
c66ac9db NB |
1169 | /* |
1170 | * Check if SAM Task Attribute emulation is enabled for this | |
1171 | * struct se_device storage object | |
1172 | */ | |
a3541703 | 1173 | if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH) |
c66ac9db NB |
1174 | return 0; |
1175 | ||
68d81f40 | 1176 | if (cmd->sam_task_attr == TCM_ACA_TAG) { |
6708bb27 | 1177 | pr_debug("SAM Task Attribute ACA" |
c66ac9db | 1178 | " emulation is not supported\n"); |
de103c93 | 1179 | return TCM_INVALID_CDB_FIELD; |
c66ac9db NB |
1180 | } |
1181 | /* | |
1182 | * Used to determine when ORDERED commands should go from | |
1183 | * Dormant to Active status. | |
1184 | */ | |
019c4ca6 | 1185 | cmd->se_ordered_id = atomic_inc_return(&dev->dev_ordered_id); |
6708bb27 | 1186 | pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n", |
c66ac9db | 1187 | cmd->se_ordered_id, cmd->sam_task_attr, |
019c4ca6 | 1188 | dev->transport->name); |
c66ac9db NB |
1189 | return 0; |
1190 | } | |
1191 | ||
de103c93 CH |
1192 | sense_reason_t |
1193 | target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb) | |
c66ac9db | 1194 | { |
0fd97ccf | 1195 | struct se_device *dev = cmd->se_dev; |
de103c93 | 1196 | sense_reason_t ret; |
c66ac9db | 1197 | |
c66ac9db NB |
1198 | /* |
1199 | * Ensure that the received CDB is less than the max (252 + 8) bytes | |
1200 | * for VARIABLE_LENGTH_CMD | |
1201 | */ | |
1202 | if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) { | |
6708bb27 | 1203 | pr_err("Received SCSI CDB with command_size: %d that" |
c66ac9db NB |
1204 | " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n", |
1205 | scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE); | |
de103c93 | 1206 | return TCM_INVALID_CDB_FIELD; |
c66ac9db NB |
1207 | } |
1208 | /* | |
1209 | * If the received CDB is larger than TCM_MAX_COMMAND_SIZE, | |
1210 | * allocate the additional extended CDB buffer now.. Otherwise | |
1211 | * setup the pointer from __t_task_cdb to t_task_cdb. | |
1212 | */ | |
a1d8b49a AG |
1213 | if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) { |
1214 | cmd->t_task_cdb = kzalloc(scsi_command_size(cdb), | |
c66ac9db | 1215 | GFP_KERNEL); |
6708bb27 AG |
1216 | if (!cmd->t_task_cdb) { |
1217 | pr_err("Unable to allocate cmd->t_task_cdb" | |
a1d8b49a | 1218 | " %u > sizeof(cmd->__t_task_cdb): %lu ops\n", |
c66ac9db | 1219 | scsi_command_size(cdb), |
a1d8b49a | 1220 | (unsigned long)sizeof(cmd->__t_task_cdb)); |
de103c93 | 1221 | return TCM_OUT_OF_RESOURCES; |
c66ac9db NB |
1222 | } |
1223 | } else | |
a1d8b49a | 1224 | cmd->t_task_cdb = &cmd->__t_task_cdb[0]; |
c66ac9db | 1225 | /* |
a1d8b49a | 1226 | * Copy the original CDB into cmd-> |
c66ac9db | 1227 | */ |
a1d8b49a | 1228 | memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb)); |
cb4f4d3c | 1229 | |
e5c0d6ad RD |
1230 | trace_target_sequencer_start(cmd); |
1231 | ||
cb4f4d3c CH |
1232 | /* |
1233 | * Check for an existing UNIT ATTENTION condition | |
1234 | */ | |
de103c93 CH |
1235 | ret = target_scsi3_ua_check(cmd); |
1236 | if (ret) | |
1237 | return ret; | |
cb4f4d3c | 1238 | |
c87fbd56 | 1239 | ret = target_alua_state_check(cmd); |
de103c93 CH |
1240 | if (ret) |
1241 | return ret; | |
cb4f4d3c | 1242 | |
d977f437 | 1243 | ret = target_check_reservation(cmd); |
f85eda8d NB |
1244 | if (ret) { |
1245 | cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT; | |
d977f437 | 1246 | return ret; |
f85eda8d | 1247 | } |
cb4f4d3c | 1248 | |
0fd97ccf | 1249 | ret = dev->transport->parse_cdb(cmd); |
de103c93 CH |
1250 | if (ret) |
1251 | return ret; | |
1252 | ||
1253 | ret = transport_check_alloc_task_attr(cmd); | |
1254 | if (ret) | |
c66ac9db | 1255 | return ret; |
cb4f4d3c | 1256 | |
cb4f4d3c | 1257 | cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE; |
4cc987ea | 1258 | atomic_long_inc(&cmd->se_lun->lun_stats.cmd_pdus); |
c66ac9db NB |
1259 | return 0; |
1260 | } | |
a12f41f8 | 1261 | EXPORT_SYMBOL(target_setup_cmd_from_cdb); |
c66ac9db | 1262 | |
695434e1 NB |
1263 | /* |
1264 | * Used by fabric module frontends to queue tasks directly. | |
1265 | * Many only be used from process context only | |
1266 | */ | |
1267 | int transport_handle_cdb_direct( | |
1268 | struct se_cmd *cmd) | |
1269 | { | |
de103c93 | 1270 | sense_reason_t ret; |
dd8ae59d | 1271 | |
695434e1 NB |
1272 | if (!cmd->se_lun) { |
1273 | dump_stack(); | |
6708bb27 | 1274 | pr_err("cmd->se_lun is NULL\n"); |
695434e1 NB |
1275 | return -EINVAL; |
1276 | } | |
1277 | if (in_interrupt()) { | |
1278 | dump_stack(); | |
6708bb27 | 1279 | pr_err("transport_generic_handle_cdb cannot be called" |
695434e1 NB |
1280 | " from interrupt context\n"); |
1281 | return -EINVAL; | |
1282 | } | |
dd8ae59d | 1283 | /* |
af877292 CH |
1284 | * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that |
1285 | * outstanding descriptors are handled correctly during shutdown via | |
1286 | * transport_wait_for_tasks() | |
dd8ae59d NB |
1287 | * |
1288 | * Also, we don't take cmd->t_state_lock here as we only expect | |
1289 | * this to be called for initial descriptor submission. | |
1290 | */ | |
1291 | cmd->t_state = TRANSPORT_NEW_CMD; | |
7d680f3b CH |
1292 | cmd->transport_state |= CMD_T_ACTIVE; |
1293 | ||
dd8ae59d NB |
1294 | /* |
1295 | * transport_generic_new_cmd() is already handling QUEUE_FULL, | |
1296 | * so follow TRANSPORT_NEW_CMD processing thread context usage | |
1297 | * and call transport_generic_request_failure() if necessary.. | |
1298 | */ | |
1299 | ret = transport_generic_new_cmd(cmd); | |
de103c93 CH |
1300 | if (ret) |
1301 | transport_generic_request_failure(cmd, ret); | |
dd8ae59d | 1302 | return 0; |
695434e1 NB |
1303 | } |
1304 | EXPORT_SYMBOL(transport_handle_cdb_direct); | |
1305 | ||
c5ff8d6b | 1306 | sense_reason_t |
de103c93 CH |
1307 | transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl, |
1308 | u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count) | |
1309 | { | |
1310 | if (!sgl || !sgl_count) | |
1311 | return 0; | |
1312 | ||
1313 | /* | |
1314 | * Reject SCSI data overflow with map_mem_to_cmd() as incoming | |
1315 | * scatterlists already have been set to follow what the fabric | |
1316 | * passes for the original expected data transfer length. | |
1317 | */ | |
1318 | if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) { | |
1319 | pr_warn("Rejecting SCSI DATA overflow for fabric using" | |
1320 | " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n"); | |
1321 | return TCM_INVALID_CDB_FIELD; | |
1322 | } | |
1323 | ||
1324 | cmd->t_data_sg = sgl; | |
1325 | cmd->t_data_nents = sgl_count; | |
b32bd0a8 IT |
1326 | cmd->t_bidi_data_sg = sgl_bidi; |
1327 | cmd->t_bidi_data_nents = sgl_bidi_count; | |
de103c93 | 1328 | |
de103c93 CH |
1329 | cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC; |
1330 | return 0; | |
1331 | } | |
1332 | ||
a026757f NB |
1333 | /* |
1334 | * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized | |
1335 | * se_cmd + use pre-allocated SGL memory. | |
a6360785 NB |
1336 | * |
1337 | * @se_cmd: command descriptor to submit | |
1338 | * @se_sess: associated se_sess for endpoint | |
1339 | * @cdb: pointer to SCSI CDB | |
1340 | * @sense: pointer to SCSI sense buffer | |
1341 | * @unpacked_lun: unpacked LUN to reference for struct se_lun | |
1342 | * @data_length: fabric expected data transfer length | |
1343 | * @task_addr: SAM task attribute | |
1344 | * @data_dir: DMA data direction | |
1345 | * @flags: flags for command submission from target_sc_flags_tables | |
a026757f NB |
1346 | * @sgl: struct scatterlist memory for unidirectional mapping |
1347 | * @sgl_count: scatterlist count for unidirectional mapping | |
1348 | * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping | |
1349 | * @sgl_bidi_count: scatterlist count for bidirectional READ mapping | |
def2b339 NB |
1350 | * @sgl_prot: struct scatterlist memory protection information |
1351 | * @sgl_prot_count: scatterlist count for protection information | |
a6360785 | 1352 | * |
649ee054 BVA |
1353 | * Task tags are supported if the caller has set @se_cmd->tag. |
1354 | * | |
d6dfc868 RD |
1355 | * Returns non zero to signal active I/O shutdown failure. All other |
1356 | * setup exceptions will be returned as a SCSI CHECK_CONDITION response, | |
1357 | * but still return zero here. | |
1358 | * | |
a6360785 NB |
1359 | * This may only be called from process context, and also currently |
1360 | * assumes internal allocation of fabric payload buffer by target-core. | |
a026757f NB |
1361 | */ |
1362 | int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess, | |
f2d30680 | 1363 | unsigned char *cdb, unsigned char *sense, u64 unpacked_lun, |
a026757f NB |
1364 | u32 data_length, int task_attr, int data_dir, int flags, |
1365 | struct scatterlist *sgl, u32 sgl_count, | |
def2b339 NB |
1366 | struct scatterlist *sgl_bidi, u32 sgl_bidi_count, |
1367 | struct scatterlist *sgl_prot, u32 sgl_prot_count) | |
a6360785 NB |
1368 | { |
1369 | struct se_portal_group *se_tpg; | |
de103c93 CH |
1370 | sense_reason_t rc; |
1371 | int ret; | |
a6360785 NB |
1372 | |
1373 | se_tpg = se_sess->se_tpg; | |
1374 | BUG_ON(!se_tpg); | |
1375 | BUG_ON(se_cmd->se_tfo || se_cmd->se_sess); | |
1376 | BUG_ON(in_interrupt()); | |
1377 | /* | |
1378 | * Initialize se_cmd for target operation. From this point | |
1379 | * exceptions are handled by sending exception status via | |
1380 | * target_core_fabric_ops->queue_status() callback | |
1381 | */ | |
1382 | transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, | |
1383 | data_length, data_dir, task_attr, sense); | |
b0d79946 SAS |
1384 | if (flags & TARGET_SCF_UNKNOWN_SIZE) |
1385 | se_cmd->unknown_data_length = 1; | |
a6360785 NB |
1386 | /* |
1387 | * Obtain struct se_cmd->cmd_kref reference and add new cmd to | |
1388 | * se_sess->sess_cmd_list. A second kref_get here is necessary | |
1389 | * for fabrics using TARGET_SCF_ACK_KREF that expect a second | |
1390 | * kref_put() to happen during fabric packet acknowledgement. | |
1391 | */ | |
afc16604 | 1392 | ret = target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF); |
de103c93 CH |
1393 | if (ret) |
1394 | return ret; | |
a6360785 NB |
1395 | /* |
1396 | * Signal bidirectional data payloads to target-core | |
1397 | */ | |
1398 | if (flags & TARGET_SCF_BIDI_OP) | |
1399 | se_cmd->se_cmd_flags |= SCF_BIDI; | |
1400 | /* | |
1401 | * Locate se_lun pointer and attach it to struct se_cmd | |
1402 | */ | |
de103c93 CH |
1403 | rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun); |
1404 | if (rc) { | |
1405 | transport_send_check_condition_and_sense(se_cmd, rc, 0); | |
afc16604 | 1406 | target_put_sess_cmd(se_cmd); |
d6dfc868 | 1407 | return 0; |
735703ca | 1408 | } |
b5b8e298 SG |
1409 | |
1410 | rc = target_setup_cmd_from_cdb(se_cmd, cdb); | |
1411 | if (rc != 0) { | |
1412 | transport_generic_request_failure(se_cmd, rc); | |
1413 | return 0; | |
1414 | } | |
1415 | ||
def2b339 NB |
1416 | /* |
1417 | * Save pointers for SGLs containing protection information, | |
1418 | * if present. | |
1419 | */ | |
1420 | if (sgl_prot_count) { | |
1421 | se_cmd->t_prot_sg = sgl_prot; | |
1422 | se_cmd->t_prot_nents = sgl_prot_count; | |
5835812f | 1423 | se_cmd->se_cmd_flags |= SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC; |
def2b339 | 1424 | } |
d6e0175c | 1425 | |
a026757f NB |
1426 | /* |
1427 | * When a non zero sgl_count has been passed perform SGL passthrough | |
1428 | * mapping for pre-allocated fabric memory instead of having target | |
1429 | * core perform an internal SGL allocation.. | |
1430 | */ | |
1431 | if (sgl_count != 0) { | |
1432 | BUG_ON(!sgl); | |
1433 | ||
944981c7 NB |
1434 | /* |
1435 | * A work-around for tcm_loop as some userspace code via | |
1436 | * scsi-generic do not memset their associated read buffers, | |
1437 | * so go ahead and do that here for type non-data CDBs. Also | |
1438 | * note that this is currently guaranteed to be a single SGL | |
1439 | * for this case by target core in target_setup_cmd_from_cdb() | |
1440 | * -> transport_generic_cmd_sequencer(). | |
1441 | */ | |
1442 | if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) && | |
1443 | se_cmd->data_direction == DMA_FROM_DEVICE) { | |
1444 | unsigned char *buf = NULL; | |
1445 | ||
1446 | if (sgl) | |
1447 | buf = kmap(sg_page(sgl)) + sgl->offset; | |
1448 | ||
1449 | if (buf) { | |
1450 | memset(buf, 0, sgl->length); | |
1451 | kunmap(sg_page(sgl)); | |
1452 | } | |
1453 | } | |
1454 | ||
a026757f NB |
1455 | rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count, |
1456 | sgl_bidi, sgl_bidi_count); | |
1457 | if (rc != 0) { | |
de103c93 | 1458 | transport_generic_request_failure(se_cmd, rc); |
a026757f NB |
1459 | return 0; |
1460 | } | |
1461 | } | |
def2b339 | 1462 | |
11e319ed AG |
1463 | /* |
1464 | * Check if we need to delay processing because of ALUA | |
1465 | * Active/NonOptimized primary access state.. | |
1466 | */ | |
1467 | core_alua_check_nonop_delay(se_cmd); | |
1468 | ||
a6360785 | 1469 | transport_handle_cdb_direct(se_cmd); |
d6dfc868 | 1470 | return 0; |
a6360785 | 1471 | } |
a026757f NB |
1472 | EXPORT_SYMBOL(target_submit_cmd_map_sgls); |
1473 | ||
1474 | /* | |
1475 | * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd | |
1476 | * | |
1477 | * @se_cmd: command descriptor to submit | |
1478 | * @se_sess: associated se_sess for endpoint | |
1479 | * @cdb: pointer to SCSI CDB | |
1480 | * @sense: pointer to SCSI sense buffer | |
1481 | * @unpacked_lun: unpacked LUN to reference for struct se_lun | |
1482 | * @data_length: fabric expected data transfer length | |
1483 | * @task_addr: SAM task attribute | |
1484 | * @data_dir: DMA data direction | |
1485 | * @flags: flags for command submission from target_sc_flags_tables | |
1486 | * | |
649ee054 BVA |
1487 | * Task tags are supported if the caller has set @se_cmd->tag. |
1488 | * | |
a026757f NB |
1489 | * Returns non zero to signal active I/O shutdown failure. All other |
1490 | * setup exceptions will be returned as a SCSI CHECK_CONDITION response, | |
1491 | * but still return zero here. | |
1492 | * | |
1493 | * This may only be called from process context, and also currently | |
1494 | * assumes internal allocation of fabric payload buffer by target-core. | |
1495 | * | |
1496 | * It also assumes interal target core SGL memory allocation. | |
1497 | */ | |
1498 | int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess, | |
f2d30680 | 1499 | unsigned char *cdb, unsigned char *sense, u64 unpacked_lun, |
a026757f NB |
1500 | u32 data_length, int task_attr, int data_dir, int flags) |
1501 | { | |
1502 | return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense, | |
1503 | unpacked_lun, data_length, task_attr, data_dir, | |
def2b339 | 1504 | flags, NULL, 0, NULL, 0, NULL, 0); |
a026757f | 1505 | } |
a6360785 NB |
1506 | EXPORT_SYMBOL(target_submit_cmd); |
1507 | ||
9f0d05c2 NB |
1508 | static void target_complete_tmr_failure(struct work_struct *work) |
1509 | { | |
1510 | struct se_cmd *se_cmd = container_of(work, struct se_cmd, work); | |
1511 | ||
1512 | se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST; | |
1513 | se_cmd->se_tfo->queue_tm_rsp(se_cmd); | |
5a3b6fc0 RD |
1514 | |
1515 | transport_cmd_check_stop_to_fabric(se_cmd); | |
9f0d05c2 NB |
1516 | } |
1517 | ||
ea98d7f9 AG |
1518 | /** |
1519 | * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd | |
1520 | * for TMR CDBs | |
1521 | * | |
1522 | * @se_cmd: command descriptor to submit | |
1523 | * @se_sess: associated se_sess for endpoint | |
1524 | * @sense: pointer to SCSI sense buffer | |
1525 | * @unpacked_lun: unpacked LUN to reference for struct se_lun | |
1526 | * @fabric_context: fabric context for TMR req | |
1527 | * @tm_type: Type of TM request | |
c0974f89 NB |
1528 | * @gfp: gfp type for caller |
1529 | * @tag: referenced task tag for TMR_ABORT_TASK | |
c7042cae | 1530 | * @flags: submit cmd flags |
ea98d7f9 AG |
1531 | * |
1532 | * Callable from all contexts. | |
1533 | **/ | |
1534 | ||
c7042cae | 1535 | int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess, |
f2d30680 | 1536 | unsigned char *sense, u64 unpacked_lun, |
c0974f89 NB |
1537 | void *fabric_tmr_ptr, unsigned char tm_type, |
1538 | gfp_t gfp, unsigned int tag, int flags) | |
ea98d7f9 AG |
1539 | { |
1540 | struct se_portal_group *se_tpg; | |
1541 | int ret; | |
1542 | ||
1543 | se_tpg = se_sess->se_tpg; | |
1544 | BUG_ON(!se_tpg); | |
1545 | ||
1546 | transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, | |
68d81f40 | 1547 | 0, DMA_NONE, TCM_SIMPLE_TAG, sense); |
c7042cae NB |
1548 | /* |
1549 | * FIXME: Currently expect caller to handle se_cmd->se_tmr_req | |
1550 | * allocation failure. | |
1551 | */ | |
c0974f89 | 1552 | ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp); |
c7042cae NB |
1553 | if (ret < 0) |
1554 | return -ENOMEM; | |
ea98d7f9 | 1555 | |
c0974f89 NB |
1556 | if (tm_type == TMR_ABORT_TASK) |
1557 | se_cmd->se_tmr_req->ref_task_tag = tag; | |
1558 | ||
ea98d7f9 | 1559 | /* See target_submit_cmd for commentary */ |
afc16604 | 1560 | ret = target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF); |
bc187ea6 RD |
1561 | if (ret) { |
1562 | core_tmr_release_req(se_cmd->se_tmr_req); | |
1563 | return ret; | |
1564 | } | |
ea98d7f9 | 1565 | |
ea98d7f9 AG |
1566 | ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun); |
1567 | if (ret) { | |
9f0d05c2 NB |
1568 | /* |
1569 | * For callback during failure handling, push this work off | |
1570 | * to process context with TMR_LUN_DOES_NOT_EXIST status. | |
1571 | */ | |
1572 | INIT_WORK(&se_cmd->work, target_complete_tmr_failure); | |
1573 | schedule_work(&se_cmd->work); | |
c7042cae | 1574 | return 0; |
ea98d7f9 AG |
1575 | } |
1576 | transport_generic_handle_tmr(se_cmd); | |
c7042cae | 1577 | return 0; |
ea98d7f9 AG |
1578 | } |
1579 | EXPORT_SYMBOL(target_submit_tmr); | |
1580 | ||
cdbb70bb | 1581 | /* |
cf572a96 | 1582 | * If the cmd is active, request it to be stopped and sleep until it |
cdbb70bb CH |
1583 | * has completed. |
1584 | */ | |
cf572a96 | 1585 | bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags) |
cb0df4d3 BVA |
1586 | __releases(&cmd->t_state_lock) |
1587 | __acquires(&cmd->t_state_lock) | |
cdbb70bb | 1588 | { |
cdbb70bb CH |
1589 | bool was_active = false; |
1590 | ||
cf572a96 CH |
1591 | if (cmd->transport_state & CMD_T_BUSY) { |
1592 | cmd->transport_state |= CMD_T_REQUEST_STOP; | |
cdbb70bb CH |
1593 | spin_unlock_irqrestore(&cmd->t_state_lock, *flags); |
1594 | ||
cf572a96 CH |
1595 | pr_debug("cmd %p waiting to complete\n", cmd); |
1596 | wait_for_completion(&cmd->task_stop_comp); | |
1597 | pr_debug("cmd %p stopped successfully\n", cmd); | |
cdbb70bb CH |
1598 | |
1599 | spin_lock_irqsave(&cmd->t_state_lock, *flags); | |
cf572a96 CH |
1600 | cmd->transport_state &= ~CMD_T_REQUEST_STOP; |
1601 | cmd->transport_state &= ~CMD_T_BUSY; | |
cdbb70bb CH |
1602 | was_active = true; |
1603 | } | |
1604 | ||
cdbb70bb CH |
1605 | return was_active; |
1606 | } | |
1607 | ||
c66ac9db NB |
1608 | /* |
1609 | * Handle SAM-esque emulation for generic transport request failures. | |
1610 | */ | |
de103c93 CH |
1611 | void transport_generic_request_failure(struct se_cmd *cmd, |
1612 | sense_reason_t sense_reason) | |
c66ac9db | 1613 | { |
07bde79a NB |
1614 | int ret = 0; |
1615 | ||
649ee054 BVA |
1616 | pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08llx" |
1617 | " CDB: 0x%02x\n", cmd, cmd->tag, cmd->t_task_cdb[0]); | |
de103c93 | 1618 | pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n", |
e3d6f909 | 1619 | cmd->se_tfo->get_cmd_state(cmd), |
de103c93 | 1620 | cmd->t_state, sense_reason); |
d43d6aea | 1621 | pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n", |
7d680f3b CH |
1622 | (cmd->transport_state & CMD_T_ACTIVE) != 0, |
1623 | (cmd->transport_state & CMD_T_STOP) != 0, | |
1624 | (cmd->transport_state & CMD_T_SENT) != 0); | |
c66ac9db | 1625 | |
c66ac9db NB |
1626 | /* |
1627 | * For SAM Task Attribute emulation for failed struct se_cmd | |
1628 | */ | |
019c4ca6 | 1629 | transport_complete_task_attr(cmd); |
cf6d1f09 NB |
1630 | /* |
1631 | * Handle special case for COMPARE_AND_WRITE failure, where the | |
c8e63985 | 1632 | * callback is expected to drop the per device ->caw_sem. |
cf6d1f09 NB |
1633 | */ |
1634 | if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) && | |
1635 | cmd->transport_complete_callback) | |
c8e63985 | 1636 | cmd->transport_complete_callback(cmd, false); |
c66ac9db | 1637 | |
de103c93 | 1638 | switch (sense_reason) { |
03e98c9e NB |
1639 | case TCM_NON_EXISTENT_LUN: |
1640 | case TCM_UNSUPPORTED_SCSI_OPCODE: | |
1641 | case TCM_INVALID_CDB_FIELD: | |
1642 | case TCM_INVALID_PARAMETER_LIST: | |
bb992e72 | 1643 | case TCM_PARAMETER_LIST_LENGTH_ERROR: |
03e98c9e NB |
1644 | case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE: |
1645 | case TCM_UNKNOWN_MODE_PAGE: | |
1646 | case TCM_WRITE_PROTECTED: | |
e2397c70 | 1647 | case TCM_ADDRESS_OUT_OF_RANGE: |
03e98c9e NB |
1648 | case TCM_CHECK_CONDITION_ABORT_CMD: |
1649 | case TCM_CHECK_CONDITION_UNIT_ATTENTION: | |
1650 | case TCM_CHECK_CONDITION_NOT_READY: | |
94387aa7 NB |
1651 | case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED: |
1652 | case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED: | |
1653 | case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED: | |
c66ac9db | 1654 | break; |
de103c93 CH |
1655 | case TCM_OUT_OF_RESOURCES: |
1656 | sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
1657 | break; | |
03e98c9e | 1658 | case TCM_RESERVATION_CONFLICT: |
c66ac9db NB |
1659 | /* |
1660 | * No SENSE Data payload for this case, set SCSI Status | |
1661 | * and queue the response to $FABRIC_MOD. | |
1662 | * | |
1663 | * Uses linux/include/scsi/scsi.h SAM status codes defs | |
1664 | */ | |
1665 | cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT; | |
1666 | /* | |
1667 | * For UA Interlock Code 11b, a RESERVATION CONFLICT will | |
1668 | * establish a UNIT ATTENTION with PREVIOUS RESERVATION | |
1669 | * CONFLICT STATUS. | |
1670 | * | |
1671 | * See spc4r17, section 7.4.6 Control Mode Page, Table 349 | |
1672 | */ | |
e3d6f909 | 1673 | if (cmd->se_sess && |
c51c8e7b HR |
1674 | cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2) { |
1675 | target_ua_allocate_lun(cmd->se_sess->se_node_acl, | |
1676 | cmd->orig_fe_lun, 0x2C, | |
1677 | ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS); | |
1678 | } | |
e5c0d6ad | 1679 | trace_target_cmd_complete(cmd); |
c51c8e7b | 1680 | ret = cmd->se_tfo->queue_status(cmd); |
f147abb4 | 1681 | if (ret == -EAGAIN || ret == -ENOMEM) |
07bde79a | 1682 | goto queue_full; |
c66ac9db | 1683 | goto check_stop; |
c66ac9db | 1684 | default: |
6708bb27 | 1685 | pr_err("Unknown transport error for CDB 0x%02x: %d\n", |
de103c93 CH |
1686 | cmd->t_task_cdb[0], sense_reason); |
1687 | sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; | |
c66ac9db NB |
1688 | break; |
1689 | } | |
f3146437 | 1690 | |
de103c93 | 1691 | ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0); |
03e98c9e NB |
1692 | if (ret == -EAGAIN || ret == -ENOMEM) |
1693 | goto queue_full; | |
07bde79a | 1694 | |
c66ac9db NB |
1695 | check_stop: |
1696 | transport_lun_remove_cmd(cmd); | |
6708bb27 | 1697 | if (!transport_cmd_check_stop_to_fabric(cmd)) |
c66ac9db | 1698 | ; |
07bde79a NB |
1699 | return; |
1700 | ||
1701 | queue_full: | |
e057f533 CH |
1702 | cmd->t_state = TRANSPORT_COMPLETE_QF_OK; |
1703 | transport_handle_queue_full(cmd, cmd->se_dev); | |
c66ac9db | 1704 | } |
2fbff127 | 1705 | EXPORT_SYMBOL(transport_generic_request_failure); |
c66ac9db | 1706 | |
76dde50e | 1707 | void __target_execute_cmd(struct se_cmd *cmd) |
c66ac9db | 1708 | { |
de103c93 | 1709 | sense_reason_t ret; |
5f41a31d | 1710 | |
de103c93 CH |
1711 | if (cmd->execute_cmd) { |
1712 | ret = cmd->execute_cmd(cmd); | |
1713 | if (ret) { | |
1714 | spin_lock_irq(&cmd->t_state_lock); | |
1715 | cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT); | |
1716 | spin_unlock_irq(&cmd->t_state_lock); | |
5f41a31d | 1717 | |
de103c93 CH |
1718 | transport_generic_request_failure(cmd, ret); |
1719 | } | |
5f41a31d CH |
1720 | } |
1721 | } | |
1722 | ||
aa58b531 NB |
1723 | static int target_write_prot_action(struct se_cmd *cmd) |
1724 | { | |
5132d1e6 | 1725 | u32 sectors; |
aa58b531 NB |
1726 | /* |
1727 | * Perform WRITE_INSERT of PI using software emulation when backend | |
1728 | * device has PI enabled, if the transport has not already generated | |
1729 | * PI using hardware WRITE_INSERT offload. | |
1730 | */ | |
1731 | switch (cmd->prot_op) { | |
1732 | case TARGET_PROT_DOUT_INSERT: | |
1733 | if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_INSERT)) | |
1734 | sbc_dif_generate(cmd); | |
1735 | break; | |
5132d1e6 NB |
1736 | case TARGET_PROT_DOUT_STRIP: |
1737 | if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_STRIP) | |
1738 | break; | |
1739 | ||
1740 | sectors = cmd->data_length >> ilog2(cmd->se_dev->dev_attrib.block_size); | |
f75b6fae SG |
1741 | cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba, |
1742 | sectors, 0, cmd->t_prot_sg, 0); | |
5132d1e6 NB |
1743 | if (unlikely(cmd->pi_err)) { |
1744 | spin_lock_irq(&cmd->t_state_lock); | |
6c2faeaa | 1745 | cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT); |
5132d1e6 NB |
1746 | spin_unlock_irq(&cmd->t_state_lock); |
1747 | transport_generic_request_failure(cmd, cmd->pi_err); | |
1748 | return -1; | |
1749 | } | |
1750 | break; | |
aa58b531 NB |
1751 | default: |
1752 | break; | |
1753 | } | |
1754 | ||
1755 | return 0; | |
1756 | } | |
1757 | ||
019c4ca6 | 1758 | static bool target_handle_task_attr(struct se_cmd *cmd) |
5f41a31d CH |
1759 | { |
1760 | struct se_device *dev = cmd->se_dev; | |
1761 | ||
a3541703 | 1762 | if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH) |
019c4ca6 | 1763 | return false; |
5f41a31d | 1764 | |
c66ac9db | 1765 | /* |
25985edc | 1766 | * Check for the existence of HEAD_OF_QUEUE, and if true return 1 |
c66ac9db NB |
1767 | * to allow the passed struct se_cmd list of tasks to the front of the list. |
1768 | */ | |
5f41a31d | 1769 | switch (cmd->sam_task_attr) { |
68d81f40 | 1770 | case TCM_HEAD_TAG: |
5f41a31d CH |
1771 | pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, " |
1772 | "se_ordered_id: %u\n", | |
1773 | cmd->t_task_cdb[0], cmd->se_ordered_id); | |
019c4ca6 | 1774 | return false; |
68d81f40 | 1775 | case TCM_ORDERED_TAG: |
33940d09 | 1776 | atomic_inc_mb(&dev->dev_ordered_sync); |
c66ac9db | 1777 | |
5f41a31d CH |
1778 | pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, " |
1779 | " se_ordered_id: %u\n", | |
1780 | cmd->t_task_cdb[0], cmd->se_ordered_id); | |
1781 | ||
c66ac9db | 1782 | /* |
5f41a31d CH |
1783 | * Execute an ORDERED command if no other older commands |
1784 | * exist that need to be completed first. | |
c66ac9db | 1785 | */ |
5f41a31d | 1786 | if (!atomic_read(&dev->simple_cmds)) |
019c4ca6 | 1787 | return false; |
5f41a31d CH |
1788 | break; |
1789 | default: | |
c66ac9db NB |
1790 | /* |
1791 | * For SIMPLE and UNTAGGED Task Attribute commands | |
1792 | */ | |
33940d09 | 1793 | atomic_inc_mb(&dev->simple_cmds); |
5f41a31d | 1794 | break; |
c66ac9db | 1795 | } |
5f41a31d | 1796 | |
019c4ca6 CH |
1797 | if (atomic_read(&dev->dev_ordered_sync) == 0) |
1798 | return false; | |
c66ac9db | 1799 | |
019c4ca6 CH |
1800 | spin_lock(&dev->delayed_cmd_lock); |
1801 | list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list); | |
1802 | spin_unlock(&dev->delayed_cmd_lock); | |
1803 | ||
1804 | pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to" | |
1805 | " delayed CMD list, se_ordered_id: %u\n", | |
1806 | cmd->t_task_cdb[0], cmd->sam_task_attr, | |
1807 | cmd->se_ordered_id); | |
1808 | return true; | |
1809 | } | |
1810 | ||
1811 | void target_execute_cmd(struct se_cmd *cmd) | |
1812 | { | |
1813 | /* | |
1814 | * If the received CDB has aleady been aborted stop processing it here. | |
1815 | */ | |
4a9a6c8d | 1816 | if (transport_check_aborted_status(cmd, 1)) |
5f41a31d | 1817 | return; |
c66ac9db | 1818 | |
019c4ca6 CH |
1819 | /* |
1820 | * Determine if frontend context caller is requesting the stopping of | |
1821 | * this command for frontend exceptions. | |
1822 | */ | |
4a9a6c8d | 1823 | spin_lock_irq(&cmd->t_state_lock); |
019c4ca6 | 1824 | if (cmd->transport_state & CMD_T_STOP) { |
649ee054 BVA |
1825 | pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n", |
1826 | __func__, __LINE__, cmd->tag); | |
019c4ca6 CH |
1827 | |
1828 | spin_unlock_irq(&cmd->t_state_lock); | |
a95d6511 | 1829 | complete_all(&cmd->t_transport_stop_comp); |
019c4ca6 CH |
1830 | return; |
1831 | } | |
1832 | ||
1833 | cmd->t_state = TRANSPORT_PROCESSING; | |
1a398b97 | 1834 | cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT; |
019c4ca6 | 1835 | spin_unlock_irq(&cmd->t_state_lock); |
aa58b531 NB |
1836 | |
1837 | if (target_write_prot_action(cmd)) | |
1838 | return; | |
019c4ca6 | 1839 | |
1a398b97 NB |
1840 | if (target_handle_task_attr(cmd)) { |
1841 | spin_lock_irq(&cmd->t_state_lock); | |
6c2faeaa | 1842 | cmd->transport_state &= ~(CMD_T_BUSY | CMD_T_SENT); |
1a398b97 NB |
1843 | spin_unlock_irq(&cmd->t_state_lock); |
1844 | return; | |
1845 | } | |
1846 | ||
1847 | __target_execute_cmd(cmd); | |
c66ac9db | 1848 | } |
70baf0ab | 1849 | EXPORT_SYMBOL(target_execute_cmd); |
c66ac9db | 1850 | |
5f41a31d CH |
1851 | /* |
1852 | * Process all commands up to the last received ORDERED task attribute which | |
1853 | * requires another blocking boundary | |
1854 | */ | |
1855 | static void target_restart_delayed_cmds(struct se_device *dev) | |
1856 | { | |
1857 | for (;;) { | |
1858 | struct se_cmd *cmd; | |
1859 | ||
1860 | spin_lock(&dev->delayed_cmd_lock); | |
1861 | if (list_empty(&dev->delayed_cmd_list)) { | |
1862 | spin_unlock(&dev->delayed_cmd_lock); | |
1863 | break; | |
1864 | } | |
1865 | ||
1866 | cmd = list_entry(dev->delayed_cmd_list.next, | |
1867 | struct se_cmd, se_delayed_node); | |
1868 | list_del(&cmd->se_delayed_node); | |
1869 | spin_unlock(&dev->delayed_cmd_lock); | |
1870 | ||
1871 | __target_execute_cmd(cmd); | |
1872 | ||
68d81f40 | 1873 | if (cmd->sam_task_attr == TCM_ORDERED_TAG) |
5f41a31d CH |
1874 | break; |
1875 | } | |
1876 | } | |
1877 | ||
c66ac9db | 1878 | /* |
35e0e757 | 1879 | * Called from I/O completion to determine which dormant/delayed |
c66ac9db NB |
1880 | * and ordered cmds need to have their tasks added to the execution queue. |
1881 | */ | |
1882 | static void transport_complete_task_attr(struct se_cmd *cmd) | |
1883 | { | |
5951146d | 1884 | struct se_device *dev = cmd->se_dev; |
c66ac9db | 1885 | |
a3541703 | 1886 | if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH) |
019c4ca6 CH |
1887 | return; |
1888 | ||
68d81f40 | 1889 | if (cmd->sam_task_attr == TCM_SIMPLE_TAG) { |
33940d09 | 1890 | atomic_dec_mb(&dev->simple_cmds); |
c66ac9db | 1891 | dev->dev_cur_ordered_id++; |
6708bb27 | 1892 | pr_debug("Incremented dev->dev_cur_ordered_id: %u for" |
c66ac9db NB |
1893 | " SIMPLE: %u\n", dev->dev_cur_ordered_id, |
1894 | cmd->se_ordered_id); | |
68d81f40 | 1895 | } else if (cmd->sam_task_attr == TCM_HEAD_TAG) { |
c66ac9db | 1896 | dev->dev_cur_ordered_id++; |
6708bb27 | 1897 | pr_debug("Incremented dev_cur_ordered_id: %u for" |
c66ac9db NB |
1898 | " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id, |
1899 | cmd->se_ordered_id); | |
68d81f40 | 1900 | } else if (cmd->sam_task_attr == TCM_ORDERED_TAG) { |
33940d09 | 1901 | atomic_dec_mb(&dev->dev_ordered_sync); |
c66ac9db NB |
1902 | |
1903 | dev->dev_cur_ordered_id++; | |
6708bb27 | 1904 | pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:" |
c66ac9db NB |
1905 | " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id); |
1906 | } | |
c66ac9db | 1907 | |
5f41a31d | 1908 | target_restart_delayed_cmds(dev); |
c66ac9db NB |
1909 | } |
1910 | ||
e057f533 | 1911 | static void transport_complete_qf(struct se_cmd *cmd) |
07bde79a NB |
1912 | { |
1913 | int ret = 0; | |
1914 | ||
019c4ca6 | 1915 | transport_complete_task_attr(cmd); |
e057f533 CH |
1916 | |
1917 | if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) { | |
e5c0d6ad | 1918 | trace_target_cmd_complete(cmd); |
e057f533 | 1919 | ret = cmd->se_tfo->queue_status(cmd); |
082f58ac | 1920 | goto out; |
e057f533 | 1921 | } |
07bde79a NB |
1922 | |
1923 | switch (cmd->data_direction) { | |
1924 | case DMA_FROM_DEVICE: | |
e5c0d6ad | 1925 | trace_target_cmd_complete(cmd); |
07bde79a NB |
1926 | ret = cmd->se_tfo->queue_data_in(cmd); |
1927 | break; | |
1928 | case DMA_TO_DEVICE: | |
64577407 | 1929 | if (cmd->se_cmd_flags & SCF_BIDI) { |
07bde79a | 1930 | ret = cmd->se_tfo->queue_data_in(cmd); |
63509c60 | 1931 | break; |
07bde79a NB |
1932 | } |
1933 | /* Fall through for DMA_TO_DEVICE */ | |
1934 | case DMA_NONE: | |
e5c0d6ad | 1935 | trace_target_cmd_complete(cmd); |
07bde79a NB |
1936 | ret = cmd->se_tfo->queue_status(cmd); |
1937 | break; | |
1938 | default: | |
1939 | break; | |
1940 | } | |
1941 | ||
e057f533 CH |
1942 | out: |
1943 | if (ret < 0) { | |
1944 | transport_handle_queue_full(cmd, cmd->se_dev); | |
1945 | return; | |
1946 | } | |
1947 | transport_lun_remove_cmd(cmd); | |
1948 | transport_cmd_check_stop_to_fabric(cmd); | |
07bde79a NB |
1949 | } |
1950 | ||
1951 | static void transport_handle_queue_full( | |
1952 | struct se_cmd *cmd, | |
e057f533 | 1953 | struct se_device *dev) |
07bde79a NB |
1954 | { |
1955 | spin_lock_irq(&dev->qf_cmd_lock); | |
07bde79a | 1956 | list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list); |
33940d09 | 1957 | atomic_inc_mb(&dev->dev_qf_count); |
07bde79a NB |
1958 | spin_unlock_irq(&cmd->se_dev->qf_cmd_lock); |
1959 | ||
1960 | schedule_work(&cmd->se_dev->qf_work_queue); | |
1961 | } | |
1962 | ||
fdeab852 | 1963 | static bool target_read_prot_action(struct se_cmd *cmd) |
bc005869 | 1964 | { |
fdeab852 NB |
1965 | switch (cmd->prot_op) { |
1966 | case TARGET_PROT_DIN_STRIP: | |
1967 | if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_STRIP)) { | |
f75b6fae SG |
1968 | u32 sectors = cmd->data_length >> |
1969 | ilog2(cmd->se_dev->dev_attrib.block_size); | |
1970 | ||
1971 | cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba, | |
1972 | sectors, 0, cmd->t_prot_sg, | |
1973 | 0); | |
1974 | if (cmd->pi_err) | |
fdeab852 | 1975 | return true; |
bc005869 | 1976 | } |
fdeab852 | 1977 | break; |
72c03850 NB |
1978 | case TARGET_PROT_DIN_INSERT: |
1979 | if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_INSERT) | |
1980 | break; | |
1981 | ||
1982 | sbc_dif_generate(cmd); | |
1983 | break; | |
fdeab852 NB |
1984 | default: |
1985 | break; | |
bc005869 NB |
1986 | } |
1987 | ||
1988 | return false; | |
1989 | } | |
1990 | ||
35e0e757 | 1991 | static void target_complete_ok_work(struct work_struct *work) |
c66ac9db | 1992 | { |
35e0e757 | 1993 | struct se_cmd *cmd = container_of(work, struct se_cmd, work); |
27a27099 | 1994 | int ret; |
35e0e757 | 1995 | |
c66ac9db NB |
1996 | /* |
1997 | * Check if we need to move delayed/dormant tasks from cmds on the | |
1998 | * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task | |
1999 | * Attribute. | |
2000 | */ | |
019c4ca6 CH |
2001 | transport_complete_task_attr(cmd); |
2002 | ||
07bde79a NB |
2003 | /* |
2004 | * Check to schedule QUEUE_FULL work, or execute an existing | |
2005 | * cmd->transport_qf_callback() | |
2006 | */ | |
2007 | if (atomic_read(&cmd->se_dev->dev_qf_count) != 0) | |
2008 | schedule_work(&cmd->se_dev->qf_work_queue); | |
2009 | ||
c66ac9db | 2010 | /* |
d5829eac | 2011 | * Check if we need to send a sense buffer from |
c66ac9db NB |
2012 | * the struct se_cmd in question. |
2013 | */ | |
2014 | if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) { | |
27a27099 | 2015 | WARN_ON(!cmd->scsi_status); |
27a27099 PB |
2016 | ret = transport_send_check_condition_and_sense( |
2017 | cmd, 0, 1); | |
2018 | if (ret == -EAGAIN || ret == -ENOMEM) | |
2019 | goto queue_full; | |
2020 | ||
2021 | transport_lun_remove_cmd(cmd); | |
2022 | transport_cmd_check_stop_to_fabric(cmd); | |
2023 | return; | |
c66ac9db NB |
2024 | } |
2025 | /* | |
25985edc | 2026 | * Check for a callback, used by amongst other things |
a6b0133c | 2027 | * XDWRITE_READ_10 and COMPARE_AND_WRITE emulation. |
c66ac9db | 2028 | */ |
a6b0133c NB |
2029 | if (cmd->transport_complete_callback) { |
2030 | sense_reason_t rc; | |
2031 | ||
c8e63985 | 2032 | rc = cmd->transport_complete_callback(cmd, true); |
a2890087 | 2033 | if (!rc && !(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE_POST)) { |
c8e63985 NB |
2034 | if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) && |
2035 | !cmd->data_length) | |
2036 | goto queue_rsp; | |
2037 | ||
a6b0133c | 2038 | return; |
a2890087 NB |
2039 | } else if (rc) { |
2040 | ret = transport_send_check_condition_and_sense(cmd, | |
2041 | rc, 0); | |
2042 | if (ret == -EAGAIN || ret == -ENOMEM) | |
2043 | goto queue_full; | |
a6b0133c | 2044 | |
a2890087 NB |
2045 | transport_lun_remove_cmd(cmd); |
2046 | transport_cmd_check_stop_to_fabric(cmd); | |
2047 | return; | |
2048 | } | |
a6b0133c | 2049 | } |
c66ac9db | 2050 | |
c8e63985 | 2051 | queue_rsp: |
c66ac9db NB |
2052 | switch (cmd->data_direction) { |
2053 | case DMA_FROM_DEVICE: | |
4cc987ea NB |
2054 | atomic_long_add(cmd->data_length, |
2055 | &cmd->se_lun->lun_stats.tx_data_octets); | |
bc005869 NB |
2056 | /* |
2057 | * Perform READ_STRIP of PI using software emulation when | |
2058 | * backend had PI enabled, if the transport will not be | |
2059 | * performing hardware READ_STRIP offload. | |
2060 | */ | |
fdeab852 | 2061 | if (target_read_prot_action(cmd)) { |
bc005869 NB |
2062 | ret = transport_send_check_condition_and_sense(cmd, |
2063 | cmd->pi_err, 0); | |
2064 | if (ret == -EAGAIN || ret == -ENOMEM) | |
2065 | goto queue_full; | |
2066 | ||
2067 | transport_lun_remove_cmd(cmd); | |
2068 | transport_cmd_check_stop_to_fabric(cmd); | |
2069 | return; | |
2070 | } | |
c66ac9db | 2071 | |
e5c0d6ad | 2072 | trace_target_cmd_complete(cmd); |
07bde79a | 2073 | ret = cmd->se_tfo->queue_data_in(cmd); |
f147abb4 | 2074 | if (ret == -EAGAIN || ret == -ENOMEM) |
07bde79a | 2075 | goto queue_full; |
c66ac9db NB |
2076 | break; |
2077 | case DMA_TO_DEVICE: | |
4cc987ea NB |
2078 | atomic_long_add(cmd->data_length, |
2079 | &cmd->se_lun->lun_stats.rx_data_octets); | |
c66ac9db NB |
2080 | /* |
2081 | * Check if we need to send READ payload for BIDI-COMMAND | |
2082 | */ | |
64577407 | 2083 | if (cmd->se_cmd_flags & SCF_BIDI) { |
4cc987ea NB |
2084 | atomic_long_add(cmd->data_length, |
2085 | &cmd->se_lun->lun_stats.tx_data_octets); | |
07bde79a | 2086 | ret = cmd->se_tfo->queue_data_in(cmd); |
f147abb4 | 2087 | if (ret == -EAGAIN || ret == -ENOMEM) |
07bde79a | 2088 | goto queue_full; |
c66ac9db NB |
2089 | break; |
2090 | } | |
2091 | /* Fall through for DMA_TO_DEVICE */ | |
2092 | case DMA_NONE: | |
e5c0d6ad | 2093 | trace_target_cmd_complete(cmd); |
07bde79a | 2094 | ret = cmd->se_tfo->queue_status(cmd); |
f147abb4 | 2095 | if (ret == -EAGAIN || ret == -ENOMEM) |
07bde79a | 2096 | goto queue_full; |
c66ac9db NB |
2097 | break; |
2098 | default: | |
2099 | break; | |
2100 | } | |
2101 | ||
2102 | transport_lun_remove_cmd(cmd); | |
2103 | transport_cmd_check_stop_to_fabric(cmd); | |
07bde79a NB |
2104 | return; |
2105 | ||
2106 | queue_full: | |
6708bb27 | 2107 | pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p," |
07bde79a | 2108 | " data_direction: %d\n", cmd, cmd->data_direction); |
e057f533 CH |
2109 | cmd->t_state = TRANSPORT_COMPLETE_QF_OK; |
2110 | transport_handle_queue_full(cmd, cmd->se_dev); | |
c66ac9db NB |
2111 | } |
2112 | ||
6708bb27 | 2113 | static inline void transport_free_sgl(struct scatterlist *sgl, int nents) |
c66ac9db | 2114 | { |
ec98f782 | 2115 | struct scatterlist *sg; |
ec98f782 | 2116 | int count; |
c66ac9db | 2117 | |
6708bb27 AG |
2118 | for_each_sg(sgl, sg, nents, count) |
2119 | __free_page(sg_page(sg)); | |
c66ac9db | 2120 | |
6708bb27 AG |
2121 | kfree(sgl); |
2122 | } | |
c66ac9db | 2123 | |
47e459e6 NB |
2124 | static inline void transport_reset_sgl_orig(struct se_cmd *cmd) |
2125 | { | |
2126 | /* | |
2127 | * Check for saved t_data_sg that may be used for COMPARE_AND_WRITE | |
2128 | * emulation, and free + reset pointers if necessary.. | |
2129 | */ | |
2130 | if (!cmd->t_data_sg_orig) | |
2131 | return; | |
2132 | ||
2133 | kfree(cmd->t_data_sg); | |
2134 | cmd->t_data_sg = cmd->t_data_sg_orig; | |
2135 | cmd->t_data_sg_orig = NULL; | |
2136 | cmd->t_data_nents = cmd->t_data_nents_orig; | |
2137 | cmd->t_data_nents_orig = 0; | |
2138 | } | |
2139 | ||
6708bb27 AG |
2140 | static inline void transport_free_pages(struct se_cmd *cmd) |
2141 | { | |
5835812f AM |
2142 | if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) { |
2143 | transport_free_sgl(cmd->t_prot_sg, cmd->t_prot_nents); | |
2144 | cmd->t_prot_sg = NULL; | |
2145 | cmd->t_prot_nents = 0; | |
2146 | } | |
2147 | ||
47e459e6 | 2148 | if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) { |
c8e63985 NB |
2149 | /* |
2150 | * Release special case READ buffer payload required for | |
2151 | * SG_TO_MEM_NOALLOC to function with COMPARE_AND_WRITE | |
2152 | */ | |
2153 | if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) { | |
2154 | transport_free_sgl(cmd->t_bidi_data_sg, | |
2155 | cmd->t_bidi_data_nents); | |
2156 | cmd->t_bidi_data_sg = NULL; | |
2157 | cmd->t_bidi_data_nents = 0; | |
2158 | } | |
47e459e6 | 2159 | transport_reset_sgl_orig(cmd); |
6708bb27 | 2160 | return; |
47e459e6 NB |
2161 | } |
2162 | transport_reset_sgl_orig(cmd); | |
6708bb27 AG |
2163 | |
2164 | transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents); | |
ec98f782 AG |
2165 | cmd->t_data_sg = NULL; |
2166 | cmd->t_data_nents = 0; | |
c66ac9db | 2167 | |
6708bb27 | 2168 | transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents); |
ec98f782 AG |
2169 | cmd->t_bidi_data_sg = NULL; |
2170 | cmd->t_bidi_data_nents = 0; | |
c66ac9db NB |
2171 | } |
2172 | ||
e26d99ae CH |
2173 | /** |
2174 | * transport_release_cmd - free a command | |
2175 | * @cmd: command to free | |
2176 | * | |
2177 | * This routine unconditionally frees a command, and reference counting | |
2178 | * or list removal must be done in the caller. | |
2179 | */ | |
d5ddad41 | 2180 | static int transport_release_cmd(struct se_cmd *cmd) |
e26d99ae CH |
2181 | { |
2182 | BUG_ON(!cmd->se_tfo); | |
2183 | ||
c8e31f26 | 2184 | if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB) |
e26d99ae CH |
2185 | core_tmr_release_req(cmd->se_tmr_req); |
2186 | if (cmd->t_task_cdb != cmd->__t_task_cdb) | |
2187 | kfree(cmd->t_task_cdb); | |
2188 | /* | |
7481deb4 NB |
2189 | * If this cmd has been setup with target_get_sess_cmd(), drop |
2190 | * the kref and call ->release_cmd() in kref callback. | |
e26d99ae | 2191 | */ |
afc16604 | 2192 | return target_put_sess_cmd(cmd); |
e26d99ae CH |
2193 | } |
2194 | ||
d3df7825 CH |
2195 | /** |
2196 | * transport_put_cmd - release a reference to a command | |
2197 | * @cmd: command to release | |
2198 | * | |
2199 | * This routine releases our reference to the command and frees it if possible. | |
2200 | */ | |
d5ddad41 | 2201 | static int transport_put_cmd(struct se_cmd *cmd) |
c66ac9db | 2202 | { |
c66ac9db | 2203 | transport_free_pages(cmd); |
d5ddad41 | 2204 | return transport_release_cmd(cmd); |
c66ac9db | 2205 | } |
c66ac9db | 2206 | |
4949314c | 2207 | void *transport_kmap_data_sg(struct se_cmd *cmd) |
05d1c7c0 | 2208 | { |
ec98f782 | 2209 | struct scatterlist *sg = cmd->t_data_sg; |
4949314c AG |
2210 | struct page **pages; |
2211 | int i; | |
05d1c7c0 AG |
2212 | |
2213 | /* | |
ec98f782 AG |
2214 | * We need to take into account a possible offset here for fabrics like |
2215 | * tcm_loop who may be using a contig buffer from the SCSI midlayer for | |
2216 | * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd() | |
05d1c7c0 | 2217 | */ |
4949314c AG |
2218 | if (!cmd->t_data_nents) |
2219 | return NULL; | |
3717ef0c PB |
2220 | |
2221 | BUG_ON(!sg); | |
2222 | if (cmd->t_data_nents == 1) | |
4949314c AG |
2223 | return kmap(sg_page(sg)) + sg->offset; |
2224 | ||
2225 | /* >1 page. use vmap */ | |
2226 | pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL); | |
de103c93 | 2227 | if (!pages) |
4949314c AG |
2228 | return NULL; |
2229 | ||
2230 | /* convert sg[] to pages[] */ | |
2231 | for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) { | |
2232 | pages[i] = sg_page(sg); | |
2233 | } | |
2234 | ||
2235 | cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL); | |
2236 | kfree(pages); | |
de103c93 | 2237 | if (!cmd->t_data_vmap) |
4949314c AG |
2238 | return NULL; |
2239 | ||
2240 | return cmd->t_data_vmap + cmd->t_data_sg[0].offset; | |
05d1c7c0 | 2241 | } |
4949314c | 2242 | EXPORT_SYMBOL(transport_kmap_data_sg); |
05d1c7c0 | 2243 | |
4949314c | 2244 | void transport_kunmap_data_sg(struct se_cmd *cmd) |
05d1c7c0 | 2245 | { |
a1edf9cf | 2246 | if (!cmd->t_data_nents) { |
4949314c | 2247 | return; |
a1edf9cf | 2248 | } else if (cmd->t_data_nents == 1) { |
4949314c | 2249 | kunmap(sg_page(cmd->t_data_sg)); |
a1edf9cf AG |
2250 | return; |
2251 | } | |
4949314c AG |
2252 | |
2253 | vunmap(cmd->t_data_vmap); | |
2254 | cmd->t_data_vmap = NULL; | |
05d1c7c0 | 2255 | } |
4949314c | 2256 | EXPORT_SYMBOL(transport_kunmap_data_sg); |
05d1c7c0 | 2257 | |
c5ff8d6b | 2258 | int |
20093994 NB |
2259 | target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, u32 length, |
2260 | bool zero_page) | |
c66ac9db | 2261 | { |
20093994 | 2262 | struct scatterlist *sg; |
ec98f782 | 2263 | struct page *page; |
20093994 NB |
2264 | gfp_t zero_flag = (zero_page) ? __GFP_ZERO : 0; |
2265 | unsigned int nent; | |
ec98f782 | 2266 | int i = 0; |
c66ac9db | 2267 | |
20093994 NB |
2268 | nent = DIV_ROUND_UP(length, PAGE_SIZE); |
2269 | sg = kmalloc(sizeof(struct scatterlist) * nent, GFP_KERNEL); | |
2270 | if (!sg) | |
ec98f782 | 2271 | return -ENOMEM; |
c66ac9db | 2272 | |
20093994 | 2273 | sg_init_table(sg, nent); |
9db9da33 | 2274 | |
ec98f782 AG |
2275 | while (length) { |
2276 | u32 page_len = min_t(u32, length, PAGE_SIZE); | |
9db9da33 | 2277 | page = alloc_page(GFP_KERNEL | zero_flag); |
ec98f782 AG |
2278 | if (!page) |
2279 | goto out; | |
c66ac9db | 2280 | |
20093994 | 2281 | sg_set_page(&sg[i], page, page_len, 0); |
ec98f782 AG |
2282 | length -= page_len; |
2283 | i++; | |
c66ac9db | 2284 | } |
20093994 NB |
2285 | *sgl = sg; |
2286 | *nents = nent; | |
c66ac9db | 2287 | return 0; |
c66ac9db | 2288 | |
ec98f782 | 2289 | out: |
d0e27c88 | 2290 | while (i > 0) { |
ec98f782 | 2291 | i--; |
20093994 | 2292 | __free_page(sg_page(&sg[i])); |
c66ac9db | 2293 | } |
20093994 | 2294 | kfree(sg); |
ec98f782 | 2295 | return -ENOMEM; |
c66ac9db NB |
2296 | } |
2297 | ||
da0f7619 | 2298 | /* |
b16a35b0 AG |
2299 | * Allocate any required resources to execute the command. For writes we |
2300 | * might not have the payload yet, so notify the fabric via a call to | |
2301 | * ->write_pending instead. Otherwise place it on the execution queue. | |
c66ac9db | 2302 | */ |
de103c93 CH |
2303 | sense_reason_t |
2304 | transport_generic_new_cmd(struct se_cmd *cmd) | |
c66ac9db | 2305 | { |
c66ac9db | 2306 | int ret = 0; |
c8e63985 | 2307 | bool zero_flag = !(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB); |
c66ac9db | 2308 | |
5835812f AM |
2309 | if (cmd->prot_op != TARGET_PROT_NORMAL && |
2310 | !(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) { | |
2311 | ret = target_alloc_sgl(&cmd->t_prot_sg, &cmd->t_prot_nents, | |
2312 | cmd->prot_length, true); | |
2313 | if (ret < 0) | |
2314 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
2315 | } | |
2316 | ||
c66ac9db NB |
2317 | /* |
2318 | * Determine is the TCM fabric module has already allocated physical | |
2319 | * memory, and is directly calling transport_generic_map_mem_to_cmd() | |
ec98f782 | 2320 | * beforehand. |
c66ac9db | 2321 | */ |
ec98f782 AG |
2322 | if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) && |
2323 | cmd->data_length) { | |
20093994 | 2324 | |
8cefe07b NB |
2325 | if ((cmd->se_cmd_flags & SCF_BIDI) || |
2326 | (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) { | |
2327 | u32 bidi_length; | |
2328 | ||
2329 | if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) | |
2330 | bidi_length = cmd->t_task_nolb * | |
2331 | cmd->se_dev->dev_attrib.block_size; | |
2332 | else | |
2333 | bidi_length = cmd->data_length; | |
2334 | ||
2335 | ret = target_alloc_sgl(&cmd->t_bidi_data_sg, | |
2336 | &cmd->t_bidi_data_nents, | |
2337 | bidi_length, zero_flag); | |
2338 | if (ret < 0) | |
2339 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
2340 | } | |
2341 | ||
20093994 NB |
2342 | ret = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents, |
2343 | cmd->data_length, zero_flag); | |
c66ac9db | 2344 | if (ret < 0) |
de103c93 | 2345 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
c8e63985 NB |
2346 | } else if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) && |
2347 | cmd->data_length) { | |
2348 | /* | |
2349 | * Special case for COMPARE_AND_WRITE with fabrics | |
2350 | * using SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC. | |
2351 | */ | |
2352 | u32 caw_length = cmd->t_task_nolb * | |
2353 | cmd->se_dev->dev_attrib.block_size; | |
2354 | ||
2355 | ret = target_alloc_sgl(&cmd->t_bidi_data_sg, | |
2356 | &cmd->t_bidi_data_nents, | |
2357 | caw_length, zero_flag); | |
2358 | if (ret < 0) | |
2359 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
c66ac9db | 2360 | } |
c66ac9db | 2361 | /* |
c3196f0c CH |
2362 | * If this command is not a write we can execute it right here, |
2363 | * for write buffers we need to notify the fabric driver first | |
2364 | * and let it call back once the write buffers are ready. | |
c66ac9db | 2365 | */ |
5f41a31d | 2366 | target_add_to_state_list(cmd); |
885e7b0e | 2367 | if (cmd->data_direction != DMA_TO_DEVICE || cmd->data_length == 0) { |
c3196f0c CH |
2368 | target_execute_cmd(cmd); |
2369 | return 0; | |
2370 | } | |
862e6389 | 2371 | transport_cmd_check_stop(cmd, false, true); |
c3196f0c CH |
2372 | |
2373 | ret = cmd->se_tfo->write_pending(cmd); | |
2374 | if (ret == -EAGAIN || ret == -ENOMEM) | |
2375 | goto queue_full; | |
2376 | ||
de103c93 CH |
2377 | /* fabric drivers should only return -EAGAIN or -ENOMEM as error */ |
2378 | WARN_ON(ret); | |
2379 | ||
b69c1fcf | 2380 | return (!ret) ? 0 : TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
da0f7619 | 2381 | |
c3196f0c CH |
2382 | queue_full: |
2383 | pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd); | |
2384 | cmd->t_state = TRANSPORT_COMPLETE_QF_WP; | |
2385 | transport_handle_queue_full(cmd, cmd->se_dev); | |
2386 | return 0; | |
c66ac9db | 2387 | } |
a1d8b49a | 2388 | EXPORT_SYMBOL(transport_generic_new_cmd); |
c66ac9db | 2389 | |
e057f533 | 2390 | static void transport_write_pending_qf(struct se_cmd *cmd) |
07bde79a | 2391 | { |
f147abb4 NB |
2392 | int ret; |
2393 | ||
2394 | ret = cmd->se_tfo->write_pending(cmd); | |
2395 | if (ret == -EAGAIN || ret == -ENOMEM) { | |
e057f533 CH |
2396 | pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", |
2397 | cmd); | |
2398 | transport_handle_queue_full(cmd, cmd->se_dev); | |
2399 | } | |
07bde79a NB |
2400 | } |
2401 | ||
d5ddad41 | 2402 | int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks) |
c66ac9db | 2403 | { |
c130480b | 2404 | unsigned long flags; |
d5ddad41 NB |
2405 | int ret = 0; |
2406 | ||
d14921d6 | 2407 | if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) { |
c8e31f26 | 2408 | if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) |
d14921d6 NB |
2409 | transport_wait_for_tasks(cmd); |
2410 | ||
d5ddad41 | 2411 | ret = transport_release_cmd(cmd); |
d14921d6 NB |
2412 | } else { |
2413 | if (wait_for_tasks) | |
2414 | transport_wait_for_tasks(cmd); | |
c130480b NB |
2415 | /* |
2416 | * Handle WRITE failure case where transport_generic_new_cmd() | |
2417 | * has already added se_cmd to state_list, but fabric has | |
2418 | * failed command before I/O submission. | |
2419 | */ | |
2420 | if (cmd->state_active) { | |
2421 | spin_lock_irqsave(&cmd->t_state_lock, flags); | |
2422 | target_remove_from_state_list(cmd); | |
2423 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
2424 | } | |
d14921d6 | 2425 | |
82f1c8a4 | 2426 | if (cmd->se_lun) |
c66ac9db | 2427 | transport_lun_remove_cmd(cmd); |
c66ac9db | 2428 | |
d5ddad41 | 2429 | ret = transport_put_cmd(cmd); |
c66ac9db | 2430 | } |
d5ddad41 | 2431 | return ret; |
c66ac9db NB |
2432 | } |
2433 | EXPORT_SYMBOL(transport_generic_free_cmd); | |
2434 | ||
a17f091d | 2435 | /* target_get_sess_cmd - Add command to active ->sess_cmd_list |
a17f091d | 2436 | * @se_cmd: command descriptor to add |
a6360785 | 2437 | * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd() |
a17f091d | 2438 | */ |
afc16604 | 2439 | int target_get_sess_cmd(struct se_cmd *se_cmd, bool ack_kref) |
a17f091d | 2440 | { |
afc16604 | 2441 | struct se_session *se_sess = se_cmd->se_sess; |
a17f091d | 2442 | unsigned long flags; |
bc187ea6 | 2443 | int ret = 0; |
a17f091d | 2444 | |
a6360785 NB |
2445 | /* |
2446 | * Add a second kref if the fabric caller is expecting to handle | |
2447 | * fabric acknowledgement that requires two target_put_sess_cmd() | |
2448 | * invocations before se_cmd descriptor release. | |
2449 | */ | |
054922bb | 2450 | if (ack_kref) |
a6360785 | 2451 | kref_get(&se_cmd->cmd_kref); |
7481deb4 | 2452 | |
a17f091d | 2453 | spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); |
bc187ea6 RD |
2454 | if (se_sess->sess_tearing_down) { |
2455 | ret = -ESHUTDOWN; | |
2456 | goto out; | |
2457 | } | |
a17f091d | 2458 | list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list); |
bc187ea6 | 2459 | out: |
a17f091d | 2460 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); |
7544e597 BVA |
2461 | |
2462 | if (ret && ack_kref) | |
afc16604 | 2463 | target_put_sess_cmd(se_cmd); |
7544e597 | 2464 | |
bc187ea6 | 2465 | return ret; |
a17f091d | 2466 | } |
20361e69 | 2467 | EXPORT_SYMBOL(target_get_sess_cmd); |
a17f091d | 2468 | |
7481deb4 | 2469 | static void target_release_cmd_kref(struct kref *kref) |
077aa3b2 | 2470 | __releases(&se_cmd->se_sess->sess_cmd_lock) |
a17f091d | 2471 | { |
7481deb4 NB |
2472 | struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref); |
2473 | struct se_session *se_sess = se_cmd->se_sess; | |
a17f091d | 2474 | |
a17f091d | 2475 | if (list_empty(&se_cmd->se_cmd_list)) { |
ccf5ae83 | 2476 | spin_unlock(&se_sess->sess_cmd_lock); |
ffc32d52 | 2477 | se_cmd->se_tfo->release_cmd(se_cmd); |
7481deb4 | 2478 | return; |
a17f091d | 2479 | } |
a17f091d | 2480 | if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) { |
ccf5ae83 | 2481 | spin_unlock(&se_sess->sess_cmd_lock); |
a17f091d | 2482 | complete(&se_cmd->cmd_wait_comp); |
7481deb4 | 2483 | return; |
a17f091d NB |
2484 | } |
2485 | list_del(&se_cmd->se_cmd_list); | |
ccf5ae83 | 2486 | spin_unlock(&se_sess->sess_cmd_lock); |
a17f091d | 2487 | |
7481deb4 NB |
2488 | se_cmd->se_tfo->release_cmd(se_cmd); |
2489 | } | |
2490 | ||
2491 | /* target_put_sess_cmd - Check for active I/O shutdown via kref_put | |
7481deb4 NB |
2492 | * @se_cmd: command descriptor to drop |
2493 | */ | |
afc16604 | 2494 | int target_put_sess_cmd(struct se_cmd *se_cmd) |
7481deb4 | 2495 | { |
afc16604 BVA |
2496 | struct se_session *se_sess = se_cmd->se_sess; |
2497 | ||
0ed6e189 NB |
2498 | if (!se_sess) { |
2499 | se_cmd->se_tfo->release_cmd(se_cmd); | |
2500 | return 1; | |
2501 | } | |
ccf5ae83 JE |
2502 | return kref_put_spinlock_irqsave(&se_cmd->cmd_kref, target_release_cmd_kref, |
2503 | &se_sess->sess_cmd_lock); | |
a17f091d NB |
2504 | } |
2505 | EXPORT_SYMBOL(target_put_sess_cmd); | |
2506 | ||
1c7b13fe RD |
2507 | /* target_sess_cmd_list_set_waiting - Flag all commands in |
2508 | * sess_cmd_list to complete cmd_wait_comp. Set | |
2509 | * sess_tearing_down so no more commands are queued. | |
2510 | * @se_sess: session to flag | |
a17f091d | 2511 | */ |
1c7b13fe | 2512 | void target_sess_cmd_list_set_waiting(struct se_session *se_sess) |
a17f091d NB |
2513 | { |
2514 | struct se_cmd *se_cmd; | |
2515 | unsigned long flags; | |
2516 | ||
a17f091d | 2517 | spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); |
9b31a328 NB |
2518 | if (se_sess->sess_tearing_down) { |
2519 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); | |
2520 | return; | |
2521 | } | |
1c7b13fe | 2522 | se_sess->sess_tearing_down = 1; |
9b31a328 | 2523 | list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list); |
a17f091d | 2524 | |
9b31a328 | 2525 | list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list) |
a17f091d NB |
2526 | se_cmd->cmd_wait_set = 1; |
2527 | ||
2528 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); | |
2529 | } | |
1c7b13fe | 2530 | EXPORT_SYMBOL(target_sess_cmd_list_set_waiting); |
a17f091d NB |
2531 | |
2532 | /* target_wait_for_sess_cmds - Wait for outstanding descriptors | |
2533 | * @se_sess: session to wait for active I/O | |
a17f091d | 2534 | */ |
be646c2d | 2535 | void target_wait_for_sess_cmds(struct se_session *se_sess) |
a17f091d NB |
2536 | { |
2537 | struct se_cmd *se_cmd, *tmp_cmd; | |
9b31a328 | 2538 | unsigned long flags; |
a17f091d NB |
2539 | |
2540 | list_for_each_entry_safe(se_cmd, tmp_cmd, | |
9b31a328 | 2541 | &se_sess->sess_wait_list, se_cmd_list) { |
a17f091d NB |
2542 | list_del(&se_cmd->se_cmd_list); |
2543 | ||
2544 | pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:" | |
2545 | " %d\n", se_cmd, se_cmd->t_state, | |
2546 | se_cmd->se_tfo->get_cmd_state(se_cmd)); | |
2547 | ||
be646c2d JE |
2548 | wait_for_completion(&se_cmd->cmd_wait_comp); |
2549 | pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d" | |
2550 | " fabric state: %d\n", se_cmd, se_cmd->t_state, | |
2551 | se_cmd->se_tfo->get_cmd_state(se_cmd)); | |
a17f091d NB |
2552 | |
2553 | se_cmd->se_tfo->release_cmd(se_cmd); | |
2554 | } | |
9b31a328 NB |
2555 | |
2556 | spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); | |
2557 | WARN_ON(!list_empty(&se_sess->sess_cmd_list)); | |
2558 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); | |
2559 | ||
a17f091d NB |
2560 | } |
2561 | EXPORT_SYMBOL(target_wait_for_sess_cmds); | |
2562 | ||
b3eeea66 | 2563 | void transport_clear_lun_ref(struct se_lun *lun) |
c66ac9db | 2564 | { |
5277797d | 2565 | percpu_ref_kill(&lun->lun_ref); |
5277797d | 2566 | wait_for_completion(&lun->lun_ref_comp); |
c66ac9db NB |
2567 | } |
2568 | ||
d14921d6 NB |
2569 | /** |
2570 | * transport_wait_for_tasks - wait for completion to occur | |
2571 | * @cmd: command to wait | |
c66ac9db | 2572 | * |
d14921d6 NB |
2573 | * Called from frontend fabric context to wait for storage engine |
2574 | * to pause and/or release frontend generated struct se_cmd. | |
c66ac9db | 2575 | */ |
a17f091d | 2576 | bool transport_wait_for_tasks(struct se_cmd *cmd) |
c66ac9db NB |
2577 | { |
2578 | unsigned long flags; | |
2579 | ||
a1d8b49a | 2580 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c8e31f26 AG |
2581 | if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && |
2582 | !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) { | |
d14921d6 | 2583 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
a17f091d | 2584 | return false; |
d14921d6 | 2585 | } |
cb4f4d3c | 2586 | |
c8e31f26 AG |
2587 | if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) && |
2588 | !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) { | |
d14921d6 | 2589 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
a17f091d | 2590 | return false; |
d14921d6 | 2591 | } |
7d680f3b | 2592 | |
3d28934a | 2593 | if (!(cmd->transport_state & CMD_T_ACTIVE)) { |
d14921d6 | 2594 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
a17f091d | 2595 | return false; |
d14921d6 | 2596 | } |
c66ac9db | 2597 | |
7d680f3b | 2598 | cmd->transport_state |= CMD_T_STOP; |
c66ac9db | 2599 | |
649ee054 BVA |
2600 | pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08llx i_state: %d, t_state: %d, CMD_T_STOP\n", |
2601 | cmd, cmd->tag, cmd->se_tfo->get_cmd_state(cmd), cmd->t_state); | |
c66ac9db | 2602 | |
a1d8b49a | 2603 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 2604 | |
a1d8b49a | 2605 | wait_for_completion(&cmd->t_transport_stop_comp); |
c66ac9db | 2606 | |
a1d8b49a | 2607 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
7d680f3b | 2608 | cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP); |
c66ac9db | 2609 | |
649ee054 BVA |
2610 | pr_debug("wait_for_tasks: Stopped wait_for_completion(&cmd->t_transport_stop_comp) for ITT: 0x%08llx\n", |
2611 | cmd->tag); | |
c66ac9db | 2612 | |
d14921d6 | 2613 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
a17f091d NB |
2614 | |
2615 | return true; | |
c66ac9db | 2616 | } |
d14921d6 | 2617 | EXPORT_SYMBOL(transport_wait_for_tasks); |
c66ac9db | 2618 | |
ab78fef4 BVA |
2619 | struct sense_info { |
2620 | u8 key; | |
2621 | u8 asc; | |
2622 | u8 ascq; | |
2623 | bool add_sector_info; | |
2624 | }; | |
2625 | ||
2626 | static const struct sense_info sense_info_table[] = { | |
2627 | [TCM_NO_SENSE] = { | |
2628 | .key = NOT_READY | |
2629 | }, | |
2630 | [TCM_NON_EXISTENT_LUN] = { | |
2631 | .key = ILLEGAL_REQUEST, | |
2632 | .asc = 0x25 /* LOGICAL UNIT NOT SUPPORTED */ | |
2633 | }, | |
2634 | [TCM_UNSUPPORTED_SCSI_OPCODE] = { | |
2635 | .key = ILLEGAL_REQUEST, | |
2636 | .asc = 0x20, /* INVALID COMMAND OPERATION CODE */ | |
2637 | }, | |
2638 | [TCM_SECTOR_COUNT_TOO_MANY] = { | |
2639 | .key = ILLEGAL_REQUEST, | |
2640 | .asc = 0x20, /* INVALID COMMAND OPERATION CODE */ | |
2641 | }, | |
2642 | [TCM_UNKNOWN_MODE_PAGE] = { | |
2643 | .key = ILLEGAL_REQUEST, | |
2644 | .asc = 0x24, /* INVALID FIELD IN CDB */ | |
2645 | }, | |
2646 | [TCM_CHECK_CONDITION_ABORT_CMD] = { | |
2647 | .key = ABORTED_COMMAND, | |
2648 | .asc = 0x29, /* BUS DEVICE RESET FUNCTION OCCURRED */ | |
2649 | .ascq = 0x03, | |
2650 | }, | |
2651 | [TCM_INCORRECT_AMOUNT_OF_DATA] = { | |
2652 | .key = ABORTED_COMMAND, | |
2653 | .asc = 0x0c, /* WRITE ERROR */ | |
2654 | .ascq = 0x0d, /* NOT ENOUGH UNSOLICITED DATA */ | |
2655 | }, | |
2656 | [TCM_INVALID_CDB_FIELD] = { | |
2657 | .key = ILLEGAL_REQUEST, | |
2658 | .asc = 0x24, /* INVALID FIELD IN CDB */ | |
2659 | }, | |
2660 | [TCM_INVALID_PARAMETER_LIST] = { | |
2661 | .key = ILLEGAL_REQUEST, | |
2662 | .asc = 0x26, /* INVALID FIELD IN PARAMETER LIST */ | |
2663 | }, | |
2664 | [TCM_PARAMETER_LIST_LENGTH_ERROR] = { | |
2665 | .key = ILLEGAL_REQUEST, | |
2666 | .asc = 0x1a, /* PARAMETER LIST LENGTH ERROR */ | |
2667 | }, | |
2668 | [TCM_UNEXPECTED_UNSOLICITED_DATA] = { | |
2669 | .key = ILLEGAL_REQUEST, | |
2670 | .asc = 0x0c, /* WRITE ERROR */ | |
2671 | .ascq = 0x0c, /* UNEXPECTED_UNSOLICITED_DATA */ | |
2672 | }, | |
2673 | [TCM_SERVICE_CRC_ERROR] = { | |
2674 | .key = ABORTED_COMMAND, | |
2675 | .asc = 0x47, /* PROTOCOL SERVICE CRC ERROR */ | |
2676 | .ascq = 0x05, /* N/A */ | |
2677 | }, | |
2678 | [TCM_SNACK_REJECTED] = { | |
2679 | .key = ABORTED_COMMAND, | |
2680 | .asc = 0x11, /* READ ERROR */ | |
2681 | .ascq = 0x13, /* FAILED RETRANSMISSION REQUEST */ | |
2682 | }, | |
2683 | [TCM_WRITE_PROTECTED] = { | |
2684 | .key = DATA_PROTECT, | |
2685 | .asc = 0x27, /* WRITE PROTECTED */ | |
2686 | }, | |
2687 | [TCM_ADDRESS_OUT_OF_RANGE] = { | |
2688 | .key = ILLEGAL_REQUEST, | |
2689 | .asc = 0x21, /* LOGICAL BLOCK ADDRESS OUT OF RANGE */ | |
2690 | }, | |
2691 | [TCM_CHECK_CONDITION_UNIT_ATTENTION] = { | |
2692 | .key = UNIT_ATTENTION, | |
2693 | }, | |
2694 | [TCM_CHECK_CONDITION_NOT_READY] = { | |
2695 | .key = NOT_READY, | |
2696 | }, | |
2697 | [TCM_MISCOMPARE_VERIFY] = { | |
2698 | .key = MISCOMPARE, | |
2699 | .asc = 0x1d, /* MISCOMPARE DURING VERIFY OPERATION */ | |
2700 | .ascq = 0x00, | |
2701 | }, | |
2702 | [TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED] = { | |
734ca5c4 | 2703 | .key = ABORTED_COMMAND, |
ab78fef4 BVA |
2704 | .asc = 0x10, |
2705 | .ascq = 0x01, /* LOGICAL BLOCK GUARD CHECK FAILED */ | |
2706 | .add_sector_info = true, | |
2707 | }, | |
2708 | [TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED] = { | |
734ca5c4 | 2709 | .key = ABORTED_COMMAND, |
ab78fef4 BVA |
2710 | .asc = 0x10, |
2711 | .ascq = 0x02, /* LOGICAL BLOCK APPLICATION TAG CHECK FAILED */ | |
2712 | .add_sector_info = true, | |
2713 | }, | |
2714 | [TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED] = { | |
734ca5c4 | 2715 | .key = ABORTED_COMMAND, |
ab78fef4 BVA |
2716 | .asc = 0x10, |
2717 | .ascq = 0x03, /* LOGICAL BLOCK REFERENCE TAG CHECK FAILED */ | |
2718 | .add_sector_info = true, | |
2719 | }, | |
2720 | [TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE] = { | |
2721 | /* | |
2722 | * Returning ILLEGAL REQUEST would cause immediate IO errors on | |
2723 | * Solaris initiators. Returning NOT READY instead means the | |
2724 | * operations will be retried a finite number of times and we | |
2725 | * can survive intermittent errors. | |
2726 | */ | |
2727 | .key = NOT_READY, | |
2728 | .asc = 0x08, /* LOGICAL UNIT COMMUNICATION FAILURE */ | |
2729 | }, | |
2730 | }; | |
2731 | ||
f5a8b3a7 | 2732 | static int translate_sense_reason(struct se_cmd *cmd, sense_reason_t reason) |
ab78fef4 BVA |
2733 | { |
2734 | const struct sense_info *si; | |
2735 | u8 *buffer = cmd->sense_buffer; | |
2736 | int r = (__force int)reason; | |
2737 | u8 asc, ascq; | |
4e4937e8 | 2738 | bool desc_format = target_sense_desc_format(cmd->se_dev); |
ab78fef4 BVA |
2739 | |
2740 | if (r < ARRAY_SIZE(sense_info_table) && sense_info_table[r].key) | |
2741 | si = &sense_info_table[r]; | |
2742 | else | |
2743 | si = &sense_info_table[(__force int) | |
2744 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE]; | |
2745 | ||
ab78fef4 BVA |
2746 | if (reason == TCM_CHECK_CONDITION_UNIT_ATTENTION) { |
2747 | core_scsi3_ua_for_check_condition(cmd, &asc, &ascq); | |
2748 | WARN_ON_ONCE(asc == 0); | |
2749 | } else if (si->asc == 0) { | |
2750 | WARN_ON_ONCE(cmd->scsi_asc == 0); | |
2751 | asc = cmd->scsi_asc; | |
2752 | ascq = cmd->scsi_ascq; | |
2753 | } else { | |
2754 | asc = si->asc; | |
2755 | ascq = si->ascq; | |
2756 | } | |
9ec1e1ce | 2757 | |
4e4937e8 | 2758 | scsi_build_sense_buffer(desc_format, buffer, si->key, asc, ascq); |
ab78fef4 | 2759 | if (si->add_sector_info) |
f5a8b3a7 SG |
2760 | return scsi_set_sense_information(buffer, |
2761 | cmd->scsi_sense_length, | |
2762 | cmd->bad_sector); | |
2763 | ||
2764 | return 0; | |
ab78fef4 BVA |
2765 | } |
2766 | ||
de103c93 CH |
2767 | int |
2768 | transport_send_check_condition_and_sense(struct se_cmd *cmd, | |
2769 | sense_reason_t reason, int from_transport) | |
c66ac9db | 2770 | { |
c66ac9db | 2771 | unsigned long flags; |
c66ac9db | 2772 | |
a1d8b49a | 2773 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 2774 | if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) { |
a1d8b49a | 2775 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
2776 | return 0; |
2777 | } | |
2778 | cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION; | |
a1d8b49a | 2779 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 2780 | |
ab78fef4 | 2781 | if (!from_transport) { |
f5a8b3a7 SG |
2782 | int rc; |
2783 | ||
c66ac9db | 2784 | cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE; |
ab78fef4 BVA |
2785 | cmd->scsi_status = SAM_STAT_CHECK_CONDITION; |
2786 | cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER; | |
f5a8b3a7 SG |
2787 | rc = translate_sense_reason(cmd, reason); |
2788 | if (rc) | |
2789 | return rc; | |
c66ac9db | 2790 | } |
c66ac9db | 2791 | |
e5c0d6ad | 2792 | trace_target_cmd_complete(cmd); |
07bde79a | 2793 | return cmd->se_tfo->queue_status(cmd); |
c66ac9db NB |
2794 | } |
2795 | EXPORT_SYMBOL(transport_send_check_condition_and_sense); | |
2796 | ||
2797 | int transport_check_aborted_status(struct se_cmd *cmd, int send_status) | |
2798 | { | |
c18bc7d8 RD |
2799 | if (!(cmd->transport_state & CMD_T_ABORTED)) |
2800 | return 0; | |
c66ac9db | 2801 | |
68259b5a AL |
2802 | /* |
2803 | * If cmd has been aborted but either no status is to be sent or it has | |
2804 | * already been sent, just return | |
2805 | */ | |
2806 | if (!send_status || !(cmd->se_cmd_flags & SCF_SEND_DELAYED_TAS)) | |
c18bc7d8 | 2807 | return 1; |
8b1e1244 | 2808 | |
649ee054 BVA |
2809 | pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB: 0x%02x ITT: 0x%08llx\n", |
2810 | cmd->t_task_cdb[0], cmd->tag); | |
8b1e1244 | 2811 | |
68259b5a | 2812 | cmd->se_cmd_flags &= ~SCF_SEND_DELAYED_TAS; |
29f4c090 | 2813 | cmd->scsi_status = SAM_STAT_TASK_ABORTED; |
e5c0d6ad | 2814 | trace_target_cmd_complete(cmd); |
c18bc7d8 RD |
2815 | cmd->se_tfo->queue_status(cmd); |
2816 | ||
2817 | return 1; | |
c66ac9db NB |
2818 | } |
2819 | EXPORT_SYMBOL(transport_check_aborted_status); | |
2820 | ||
2821 | void transport_send_task_abort(struct se_cmd *cmd) | |
2822 | { | |
c252f003 NB |
2823 | unsigned long flags; |
2824 | ||
2825 | spin_lock_irqsave(&cmd->t_state_lock, flags); | |
68259b5a | 2826 | if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION)) { |
c252f003 NB |
2827 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
2828 | return; | |
2829 | } | |
2830 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
2831 | ||
c66ac9db NB |
2832 | /* |
2833 | * If there are still expected incoming fabric WRITEs, we wait | |
2834 | * until until they have completed before sending a TASK_ABORTED | |
2835 | * response. This response with TASK_ABORTED status will be | |
2836 | * queued back to fabric module by transport_check_aborted_status(). | |
2837 | */ | |
2838 | if (cmd->data_direction == DMA_TO_DEVICE) { | |
e3d6f909 | 2839 | if (cmd->se_tfo->write_pending_status(cmd) != 0) { |
7d680f3b | 2840 | cmd->transport_state |= CMD_T_ABORTED; |
68259b5a | 2841 | cmd->se_cmd_flags |= SCF_SEND_DELAYED_TAS; |
29f4c090 | 2842 | return; |
c66ac9db NB |
2843 | } |
2844 | } | |
2845 | cmd->scsi_status = SAM_STAT_TASK_ABORTED; | |
8b1e1244 | 2846 | |
72b59d6e RD |
2847 | transport_lun_remove_cmd(cmd); |
2848 | ||
649ee054 BVA |
2849 | pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x, ITT: 0x%08llx\n", |
2850 | cmd->t_task_cdb[0], cmd->tag); | |
8b1e1244 | 2851 | |
e5c0d6ad | 2852 | trace_target_cmd_complete(cmd); |
e3d6f909 | 2853 | cmd->se_tfo->queue_status(cmd); |
c66ac9db NB |
2854 | } |
2855 | ||
af877292 | 2856 | static void target_tmr_work(struct work_struct *work) |
c66ac9db | 2857 | { |
af877292 | 2858 | struct se_cmd *cmd = container_of(work, struct se_cmd, work); |
5951146d | 2859 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
2860 | struct se_tmr_req *tmr = cmd->se_tmr_req; |
2861 | int ret; | |
2862 | ||
2863 | switch (tmr->function) { | |
5c6cd613 | 2864 | case TMR_ABORT_TASK: |
3d28934a | 2865 | core_tmr_abort_task(dev, tmr, cmd->se_sess); |
c66ac9db | 2866 | break; |
5c6cd613 NB |
2867 | case TMR_ABORT_TASK_SET: |
2868 | case TMR_CLEAR_ACA: | |
2869 | case TMR_CLEAR_TASK_SET: | |
c66ac9db NB |
2870 | tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED; |
2871 | break; | |
5c6cd613 | 2872 | case TMR_LUN_RESET: |
c66ac9db NB |
2873 | ret = core_tmr_lun_reset(dev, tmr, NULL, NULL); |
2874 | tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE : | |
2875 | TMR_FUNCTION_REJECTED; | |
b5aafb16 HR |
2876 | if (tmr->response == TMR_FUNCTION_COMPLETE) { |
2877 | target_ua_allocate_lun(cmd->se_sess->se_node_acl, | |
2878 | cmd->orig_fe_lun, 0x29, | |
2879 | ASCQ_29H_BUS_DEVICE_RESET_FUNCTION_OCCURRED); | |
2880 | } | |
c66ac9db | 2881 | break; |
5c6cd613 | 2882 | case TMR_TARGET_WARM_RESET: |
c66ac9db NB |
2883 | tmr->response = TMR_FUNCTION_REJECTED; |
2884 | break; | |
5c6cd613 | 2885 | case TMR_TARGET_COLD_RESET: |
c66ac9db NB |
2886 | tmr->response = TMR_FUNCTION_REJECTED; |
2887 | break; | |
c66ac9db | 2888 | default: |
6708bb27 | 2889 | pr_err("Uknown TMR function: 0x%02x.\n", |
c66ac9db NB |
2890 | tmr->function); |
2891 | tmr->response = TMR_FUNCTION_REJECTED; | |
2892 | break; | |
2893 | } | |
2894 | ||
2895 | cmd->t_state = TRANSPORT_ISTATE_PROCESSING; | |
e3d6f909 | 2896 | cmd->se_tfo->queue_tm_rsp(cmd); |
c66ac9db | 2897 | |
b7b8bef7 | 2898 | transport_cmd_check_stop_to_fabric(cmd); |
c66ac9db NB |
2899 | } |
2900 | ||
af877292 CH |
2901 | int transport_generic_handle_tmr( |
2902 | struct se_cmd *cmd) | |
c66ac9db | 2903 | { |
f15e9cd9 NB |
2904 | unsigned long flags; |
2905 | ||
2906 | spin_lock_irqsave(&cmd->t_state_lock, flags); | |
2907 | cmd->transport_state |= CMD_T_ACTIVE; | |
2908 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
2909 | ||
af877292 CH |
2910 | INIT_WORK(&cmd->work, target_tmr_work); |
2911 | queue_work(cmd->se_dev->tmr_wq, &cmd->work); | |
c66ac9db NB |
2912 | return 0; |
2913 | } | |
af877292 | 2914 | EXPORT_SYMBOL(transport_generic_handle_tmr); |
814e5b45 CH |
2915 | |
2916 | bool | |
2917 | target_check_wce(struct se_device *dev) | |
2918 | { | |
2919 | bool wce = false; | |
2920 | ||
2921 | if (dev->transport->get_write_cache) | |
2922 | wce = dev->transport->get_write_cache(dev); | |
2923 | else if (dev->dev_attrib.emulate_write_cache > 0) | |
2924 | wce = true; | |
2925 | ||
2926 | return wce; | |
2927 | } | |
2928 | ||
2929 | bool | |
2930 | target_check_fua(struct se_device *dev) | |
2931 | { | |
2932 | return target_check_wce(dev) && dev->dev_attrib.emulate_fua_write > 0; | |
2933 | } |