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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> |
c66ac9db NB |
42 | |
43 | #include <target/target_core_base.h> | |
c4795fb2 CH |
44 | #include <target/target_core_backend.h> |
45 | #include <target/target_core_fabric.h> | |
c66ac9db | 46 | |
e26d99ae | 47 | #include "target_core_internal.h" |
c66ac9db | 48 | #include "target_core_alua.h" |
c66ac9db | 49 | #include "target_core_pr.h" |
c66ac9db NB |
50 | #include "target_core_ua.h" |
51 | ||
e5c0d6ad RD |
52 | #define CREATE_TRACE_POINTS |
53 | #include <trace/events/target.h> | |
54 | ||
35e0e757 | 55 | static struct workqueue_struct *target_completion_wq; |
c66ac9db | 56 | static struct kmem_cache *se_sess_cache; |
c66ac9db | 57 | struct kmem_cache *se_ua_cache; |
c66ac9db NB |
58 | struct kmem_cache *t10_pr_reg_cache; |
59 | struct kmem_cache *t10_alua_lu_gp_cache; | |
60 | struct kmem_cache *t10_alua_lu_gp_mem_cache; | |
61 | struct kmem_cache *t10_alua_tg_pt_gp_cache; | |
229d4f11 HR |
62 | struct kmem_cache *t10_alua_lba_map_cache; |
63 | struct kmem_cache *t10_alua_lba_map_mem_cache; | |
c66ac9db | 64 | |
c66ac9db | 65 | static void transport_complete_task_attr(struct se_cmd *cmd); |
07bde79a | 66 | static void transport_handle_queue_full(struct se_cmd *cmd, |
e057f533 | 67 | struct se_device *dev); |
d5ddad41 | 68 | static int transport_put_cmd(struct se_cmd *cmd); |
35e0e757 | 69 | static void target_complete_ok_work(struct work_struct *work); |
c66ac9db | 70 | |
e3d6f909 | 71 | int init_se_kmem_caches(void) |
c66ac9db | 72 | { |
c66ac9db NB |
73 | se_sess_cache = kmem_cache_create("se_sess_cache", |
74 | sizeof(struct se_session), __alignof__(struct se_session), | |
75 | 0, NULL); | |
6708bb27 AG |
76 | if (!se_sess_cache) { |
77 | pr_err("kmem_cache_create() for struct se_session" | |
c66ac9db | 78 | " failed\n"); |
c8e31f26 | 79 | goto out; |
c66ac9db NB |
80 | } |
81 | se_ua_cache = kmem_cache_create("se_ua_cache", | |
82 | sizeof(struct se_ua), __alignof__(struct se_ua), | |
83 | 0, NULL); | |
6708bb27 AG |
84 | if (!se_ua_cache) { |
85 | pr_err("kmem_cache_create() for struct se_ua failed\n"); | |
35e0e757 | 86 | goto out_free_sess_cache; |
c66ac9db | 87 | } |
c66ac9db NB |
88 | t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache", |
89 | sizeof(struct t10_pr_registration), | |
90 | __alignof__(struct t10_pr_registration), 0, NULL); | |
6708bb27 AG |
91 | if (!t10_pr_reg_cache) { |
92 | pr_err("kmem_cache_create() for struct t10_pr_registration" | |
c66ac9db | 93 | " failed\n"); |
35e0e757 | 94 | goto out_free_ua_cache; |
c66ac9db NB |
95 | } |
96 | t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache", | |
97 | sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp), | |
98 | 0, NULL); | |
6708bb27 AG |
99 | if (!t10_alua_lu_gp_cache) { |
100 | pr_err("kmem_cache_create() for t10_alua_lu_gp_cache" | |
c66ac9db | 101 | " failed\n"); |
35e0e757 | 102 | goto out_free_pr_reg_cache; |
c66ac9db NB |
103 | } |
104 | t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache", | |
105 | sizeof(struct t10_alua_lu_gp_member), | |
106 | __alignof__(struct t10_alua_lu_gp_member), 0, NULL); | |
6708bb27 AG |
107 | if (!t10_alua_lu_gp_mem_cache) { |
108 | pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_" | |
c66ac9db | 109 | "cache failed\n"); |
35e0e757 | 110 | goto out_free_lu_gp_cache; |
c66ac9db NB |
111 | } |
112 | t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache", | |
113 | sizeof(struct t10_alua_tg_pt_gp), | |
114 | __alignof__(struct t10_alua_tg_pt_gp), 0, NULL); | |
6708bb27 AG |
115 | if (!t10_alua_tg_pt_gp_cache) { |
116 | pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_" | |
c66ac9db | 117 | "cache failed\n"); |
35e0e757 | 118 | goto out_free_lu_gp_mem_cache; |
c66ac9db | 119 | } |
229d4f11 HR |
120 | t10_alua_lba_map_cache = kmem_cache_create( |
121 | "t10_alua_lba_map_cache", | |
122 | sizeof(struct t10_alua_lba_map), | |
123 | __alignof__(struct t10_alua_lba_map), 0, NULL); | |
124 | if (!t10_alua_lba_map_cache) { | |
125 | pr_err("kmem_cache_create() for t10_alua_lba_map_" | |
126 | "cache failed\n"); | |
adf653f9 | 127 | goto out_free_tg_pt_gp_cache; |
229d4f11 HR |
128 | } |
129 | t10_alua_lba_map_mem_cache = kmem_cache_create( | |
130 | "t10_alua_lba_map_mem_cache", | |
131 | sizeof(struct t10_alua_lba_map_member), | |
132 | __alignof__(struct t10_alua_lba_map_member), 0, NULL); | |
133 | if (!t10_alua_lba_map_mem_cache) { | |
134 | pr_err("kmem_cache_create() for t10_alua_lba_map_mem_" | |
135 | "cache failed\n"); | |
136 | goto out_free_lba_map_cache; | |
137 | } | |
c66ac9db | 138 | |
35e0e757 CH |
139 | target_completion_wq = alloc_workqueue("target_completion", |
140 | WQ_MEM_RECLAIM, 0); | |
141 | if (!target_completion_wq) | |
229d4f11 | 142 | goto out_free_lba_map_mem_cache; |
35e0e757 | 143 | |
c66ac9db | 144 | return 0; |
35e0e757 | 145 | |
229d4f11 HR |
146 | out_free_lba_map_mem_cache: |
147 | kmem_cache_destroy(t10_alua_lba_map_mem_cache); | |
148 | out_free_lba_map_cache: | |
149 | kmem_cache_destroy(t10_alua_lba_map_cache); | |
35e0e757 CH |
150 | out_free_tg_pt_gp_cache: |
151 | kmem_cache_destroy(t10_alua_tg_pt_gp_cache); | |
152 | out_free_lu_gp_mem_cache: | |
153 | kmem_cache_destroy(t10_alua_lu_gp_mem_cache); | |
154 | out_free_lu_gp_cache: | |
155 | kmem_cache_destroy(t10_alua_lu_gp_cache); | |
156 | out_free_pr_reg_cache: | |
157 | kmem_cache_destroy(t10_pr_reg_cache); | |
158 | out_free_ua_cache: | |
159 | kmem_cache_destroy(se_ua_cache); | |
160 | out_free_sess_cache: | |
161 | kmem_cache_destroy(se_sess_cache); | |
c66ac9db | 162 | out: |
e3d6f909 | 163 | return -ENOMEM; |
c66ac9db NB |
164 | } |
165 | ||
e3d6f909 | 166 | void release_se_kmem_caches(void) |
c66ac9db | 167 | { |
35e0e757 | 168 | destroy_workqueue(target_completion_wq); |
c66ac9db NB |
169 | kmem_cache_destroy(se_sess_cache); |
170 | kmem_cache_destroy(se_ua_cache); | |
c66ac9db NB |
171 | kmem_cache_destroy(t10_pr_reg_cache); |
172 | kmem_cache_destroy(t10_alua_lu_gp_cache); | |
173 | kmem_cache_destroy(t10_alua_lu_gp_mem_cache); | |
174 | kmem_cache_destroy(t10_alua_tg_pt_gp_cache); | |
229d4f11 HR |
175 | kmem_cache_destroy(t10_alua_lba_map_cache); |
176 | kmem_cache_destroy(t10_alua_lba_map_mem_cache); | |
c66ac9db NB |
177 | } |
178 | ||
e3d6f909 AG |
179 | /* This code ensures unique mib indexes are handed out. */ |
180 | static DEFINE_SPINLOCK(scsi_mib_index_lock); | |
181 | static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX]; | |
e89d15ee NB |
182 | |
183 | /* | |
184 | * Allocate a new row index for the entry type specified | |
185 | */ | |
186 | u32 scsi_get_new_index(scsi_index_t type) | |
187 | { | |
188 | u32 new_index; | |
189 | ||
e3d6f909 | 190 | BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX)); |
e89d15ee | 191 | |
e3d6f909 AG |
192 | spin_lock(&scsi_mib_index_lock); |
193 | new_index = ++scsi_mib_index[type]; | |
194 | spin_unlock(&scsi_mib_index_lock); | |
e89d15ee NB |
195 | |
196 | return new_index; | |
197 | } | |
198 | ||
dbc5623e | 199 | void transport_subsystem_check_init(void) |
c66ac9db NB |
200 | { |
201 | int ret; | |
283669d2 | 202 | static int sub_api_initialized; |
c66ac9db | 203 | |
dbc5623e NB |
204 | if (sub_api_initialized) |
205 | return; | |
206 | ||
c66ac9db NB |
207 | ret = request_module("target_core_iblock"); |
208 | if (ret != 0) | |
6708bb27 | 209 | pr_err("Unable to load target_core_iblock\n"); |
c66ac9db NB |
210 | |
211 | ret = request_module("target_core_file"); | |
212 | if (ret != 0) | |
6708bb27 | 213 | pr_err("Unable to load target_core_file\n"); |
c66ac9db NB |
214 | |
215 | ret = request_module("target_core_pscsi"); | |
216 | if (ret != 0) | |
6708bb27 | 217 | pr_err("Unable to load target_core_pscsi\n"); |
c66ac9db | 218 | |
7c9e7a6f AG |
219 | ret = request_module("target_core_user"); |
220 | if (ret != 0) | |
221 | pr_err("Unable to load target_core_user\n"); | |
222 | ||
e3d6f909 | 223 | sub_api_initialized = 1; |
c66ac9db NB |
224 | } |
225 | ||
e70beee7 | 226 | struct se_session *transport_init_session(enum target_prot_op sup_prot_ops) |
c66ac9db NB |
227 | { |
228 | struct se_session *se_sess; | |
229 | ||
230 | se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL); | |
6708bb27 AG |
231 | if (!se_sess) { |
232 | pr_err("Unable to allocate struct se_session from" | |
c66ac9db NB |
233 | " se_sess_cache\n"); |
234 | return ERR_PTR(-ENOMEM); | |
235 | } | |
236 | INIT_LIST_HEAD(&se_sess->sess_list); | |
237 | INIT_LIST_HEAD(&se_sess->sess_acl_list); | |
a17f091d | 238 | INIT_LIST_HEAD(&se_sess->sess_cmd_list); |
9b31a328 | 239 | INIT_LIST_HEAD(&se_sess->sess_wait_list); |
a17f091d | 240 | spin_lock_init(&se_sess->sess_cmd_lock); |
41ac82b6 | 241 | kref_init(&se_sess->sess_kref); |
e70beee7 | 242 | se_sess->sup_prot_ops = sup_prot_ops; |
c66ac9db NB |
243 | |
244 | return se_sess; | |
245 | } | |
246 | EXPORT_SYMBOL(transport_init_session); | |
247 | ||
c0add7fd NB |
248 | int transport_alloc_session_tags(struct se_session *se_sess, |
249 | unsigned int tag_num, unsigned int tag_size) | |
250 | { | |
251 | int rc; | |
252 | ||
8c7f6e9b NB |
253 | se_sess->sess_cmd_map = kzalloc(tag_num * tag_size, |
254 | GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT); | |
c0add7fd | 255 | if (!se_sess->sess_cmd_map) { |
8c7f6e9b NB |
256 | se_sess->sess_cmd_map = vzalloc(tag_num * tag_size); |
257 | if (!se_sess->sess_cmd_map) { | |
258 | pr_err("Unable to allocate se_sess->sess_cmd_map\n"); | |
259 | return -ENOMEM; | |
260 | } | |
c0add7fd NB |
261 | } |
262 | ||
263 | rc = percpu_ida_init(&se_sess->sess_tag_pool, tag_num); | |
264 | if (rc < 0) { | |
265 | pr_err("Unable to init se_sess->sess_tag_pool," | |
266 | " tag_num: %u\n", tag_num); | |
de64d3a6 | 267 | kvfree(se_sess->sess_cmd_map); |
c0add7fd NB |
268 | se_sess->sess_cmd_map = NULL; |
269 | return -ENOMEM; | |
270 | } | |
271 | ||
272 | return 0; | |
273 | } | |
274 | EXPORT_SYMBOL(transport_alloc_session_tags); | |
275 | ||
276 | struct se_session *transport_init_session_tags(unsigned int tag_num, | |
e70beee7 NB |
277 | unsigned int tag_size, |
278 | enum target_prot_op sup_prot_ops) | |
c0add7fd NB |
279 | { |
280 | struct se_session *se_sess; | |
281 | int rc; | |
282 | ||
e70beee7 | 283 | se_sess = transport_init_session(sup_prot_ops); |
c0add7fd NB |
284 | if (IS_ERR(se_sess)) |
285 | return se_sess; | |
286 | ||
287 | rc = transport_alloc_session_tags(se_sess, tag_num, tag_size); | |
288 | if (rc < 0) { | |
289 | transport_free_session(se_sess); | |
290 | return ERR_PTR(-ENOMEM); | |
291 | } | |
292 | ||
293 | return se_sess; | |
294 | } | |
295 | EXPORT_SYMBOL(transport_init_session_tags); | |
296 | ||
c66ac9db | 297 | /* |
140854cb | 298 | * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called. |
c66ac9db NB |
299 | */ |
300 | void __transport_register_session( | |
301 | struct se_portal_group *se_tpg, | |
302 | struct se_node_acl *se_nacl, | |
303 | struct se_session *se_sess, | |
304 | void *fabric_sess_ptr) | |
305 | { | |
9ac8928e | 306 | const struct target_core_fabric_ops *tfo = se_tpg->se_tpg_tfo; |
c66ac9db NB |
307 | unsigned char buf[PR_REG_ISID_LEN]; |
308 | ||
309 | se_sess->se_tpg = se_tpg; | |
310 | se_sess->fabric_sess_ptr = fabric_sess_ptr; | |
311 | /* | |
312 | * Used by struct se_node_acl's under ConfigFS to locate active se_session-t | |
313 | * | |
314 | * Only set for struct se_session's that will actually be moving I/O. | |
315 | * eg: *NOT* discovery sessions. | |
316 | */ | |
317 | if (se_nacl) { | |
bffb5128 NB |
318 | /* |
319 | * | |
320 | * Determine if fabric allows for T10-PI feature bits exposed to | |
321 | * initiators for device backends with !dev->dev_attrib.pi_prot_type. | |
322 | * | |
323 | * If so, then always save prot_type on a per se_node_acl node | |
324 | * basis and re-instate the previous sess_prot_type to avoid | |
325 | * disabling PI from below any previously initiator side | |
326 | * registered LUNs. | |
327 | */ | |
328 | if (se_nacl->saved_prot_type) | |
329 | se_sess->sess_prot_type = se_nacl->saved_prot_type; | |
330 | else if (tfo->tpg_check_prot_fabric_only) | |
331 | se_sess->sess_prot_type = se_nacl->saved_prot_type = | |
332 | tfo->tpg_check_prot_fabric_only(se_tpg); | |
c66ac9db NB |
333 | /* |
334 | * If the fabric module supports an ISID based TransportID, | |
335 | * save this value in binary from the fabric I_T Nexus now. | |
336 | */ | |
e3d6f909 | 337 | if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { |
c66ac9db | 338 | memset(&buf[0], 0, PR_REG_ISID_LEN); |
e3d6f909 | 339 | se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, |
c66ac9db NB |
340 | &buf[0], PR_REG_ISID_LEN); |
341 | se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]); | |
342 | } | |
afb999ff NB |
343 | kref_get(&se_nacl->acl_kref); |
344 | ||
c66ac9db NB |
345 | spin_lock_irq(&se_nacl->nacl_sess_lock); |
346 | /* | |
347 | * The se_nacl->nacl_sess pointer will be set to the | |
348 | * last active I_T Nexus for each struct se_node_acl. | |
349 | */ | |
350 | se_nacl->nacl_sess = se_sess; | |
351 | ||
352 | list_add_tail(&se_sess->sess_acl_list, | |
353 | &se_nacl->acl_sess_list); | |
354 | spin_unlock_irq(&se_nacl->nacl_sess_lock); | |
355 | } | |
356 | list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list); | |
357 | ||
6708bb27 | 358 | pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n", |
e3d6f909 | 359 | se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr); |
c66ac9db NB |
360 | } |
361 | EXPORT_SYMBOL(__transport_register_session); | |
362 | ||
363 | void transport_register_session( | |
364 | struct se_portal_group *se_tpg, | |
365 | struct se_node_acl *se_nacl, | |
366 | struct se_session *se_sess, | |
367 | void *fabric_sess_ptr) | |
368 | { | |
140854cb NB |
369 | unsigned long flags; |
370 | ||
371 | spin_lock_irqsave(&se_tpg->session_lock, flags); | |
c66ac9db | 372 | __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr); |
140854cb | 373 | spin_unlock_irqrestore(&se_tpg->session_lock, flags); |
c66ac9db NB |
374 | } |
375 | EXPORT_SYMBOL(transport_register_session); | |
376 | ||
ecf0dd66 | 377 | static void target_release_session(struct kref *kref) |
41ac82b6 NB |
378 | { |
379 | struct se_session *se_sess = container_of(kref, | |
380 | struct se_session, sess_kref); | |
381 | struct se_portal_group *se_tpg = se_sess->se_tpg; | |
382 | ||
383 | se_tpg->se_tpg_tfo->close_session(se_sess); | |
384 | } | |
385 | ||
386 | void target_get_session(struct se_session *se_sess) | |
387 | { | |
388 | kref_get(&se_sess->sess_kref); | |
389 | } | |
390 | EXPORT_SYMBOL(target_get_session); | |
391 | ||
33933a0e | 392 | void target_put_session(struct se_session *se_sess) |
41ac82b6 | 393 | { |
33933a0e | 394 | kref_put(&se_sess->sess_kref, target_release_session); |
41ac82b6 NB |
395 | } |
396 | EXPORT_SYMBOL(target_put_session); | |
397 | ||
f8e471f9 NB |
398 | ssize_t target_show_dynamic_sessions(struct se_portal_group *se_tpg, char *page) |
399 | { | |
400 | struct se_session *se_sess; | |
401 | ssize_t len = 0; | |
402 | ||
403 | spin_lock_bh(&se_tpg->session_lock); | |
404 | list_for_each_entry(se_sess, &se_tpg->tpg_sess_list, sess_list) { | |
405 | if (!se_sess->se_node_acl) | |
406 | continue; | |
407 | if (!se_sess->se_node_acl->dynamic_node_acl) | |
408 | continue; | |
409 | if (strlen(se_sess->se_node_acl->initiatorname) + 1 + len > PAGE_SIZE) | |
410 | break; | |
411 | ||
412 | len += snprintf(page + len, PAGE_SIZE - len, "%s\n", | |
413 | se_sess->se_node_acl->initiatorname); | |
414 | len += 1; /* Include NULL terminator */ | |
415 | } | |
416 | spin_unlock_bh(&se_tpg->session_lock); | |
417 | ||
418 | return len; | |
419 | } | |
420 | EXPORT_SYMBOL(target_show_dynamic_sessions); | |
421 | ||
afb999ff NB |
422 | static void target_complete_nacl(struct kref *kref) |
423 | { | |
424 | struct se_node_acl *nacl = container_of(kref, | |
425 | struct se_node_acl, acl_kref); | |
426 | ||
427 | complete(&nacl->acl_free_comp); | |
428 | } | |
429 | ||
430 | void target_put_nacl(struct se_node_acl *nacl) | |
431 | { | |
432 | kref_put(&nacl->acl_kref, target_complete_nacl); | |
433 | } | |
434 | ||
c66ac9db NB |
435 | void transport_deregister_session_configfs(struct se_session *se_sess) |
436 | { | |
437 | struct se_node_acl *se_nacl; | |
23388864 | 438 | unsigned long flags; |
c66ac9db NB |
439 | /* |
440 | * Used by struct se_node_acl's under ConfigFS to locate active struct se_session | |
441 | */ | |
442 | se_nacl = se_sess->se_node_acl; | |
6708bb27 | 443 | if (se_nacl) { |
23388864 | 444 | spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags); |
337c0607 NB |
445 | if (se_nacl->acl_stop == 0) |
446 | list_del(&se_sess->sess_acl_list); | |
c66ac9db NB |
447 | /* |
448 | * If the session list is empty, then clear the pointer. | |
449 | * Otherwise, set the struct se_session pointer from the tail | |
450 | * element of the per struct se_node_acl active session list. | |
451 | */ | |
452 | if (list_empty(&se_nacl->acl_sess_list)) | |
453 | se_nacl->nacl_sess = NULL; | |
454 | else { | |
455 | se_nacl->nacl_sess = container_of( | |
456 | se_nacl->acl_sess_list.prev, | |
457 | struct se_session, sess_acl_list); | |
458 | } | |
23388864 | 459 | spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags); |
c66ac9db NB |
460 | } |
461 | } | |
462 | EXPORT_SYMBOL(transport_deregister_session_configfs); | |
463 | ||
464 | void transport_free_session(struct se_session *se_sess) | |
465 | { | |
c0add7fd NB |
466 | if (se_sess->sess_cmd_map) { |
467 | percpu_ida_destroy(&se_sess->sess_tag_pool); | |
de64d3a6 | 468 | kvfree(se_sess->sess_cmd_map); |
c0add7fd | 469 | } |
c66ac9db NB |
470 | kmem_cache_free(se_sess_cache, se_sess); |
471 | } | |
472 | EXPORT_SYMBOL(transport_free_session); | |
473 | ||
474 | void transport_deregister_session(struct se_session *se_sess) | |
475 | { | |
476 | struct se_portal_group *se_tpg = se_sess->se_tpg; | |
9ac8928e | 477 | const struct target_core_fabric_ops *se_tfo; |
c66ac9db | 478 | struct se_node_acl *se_nacl; |
e63a8e19 | 479 | unsigned long flags; |
403edd78 | 480 | bool comp_nacl = true, drop_nacl = false; |
c66ac9db | 481 | |
6708bb27 | 482 | if (!se_tpg) { |
c66ac9db NB |
483 | transport_free_session(se_sess); |
484 | return; | |
485 | } | |
01468346 | 486 | se_tfo = se_tpg->se_tpg_tfo; |
c66ac9db | 487 | |
e63a8e19 | 488 | spin_lock_irqsave(&se_tpg->session_lock, flags); |
c66ac9db NB |
489 | list_del(&se_sess->sess_list); |
490 | se_sess->se_tpg = NULL; | |
491 | se_sess->fabric_sess_ptr = NULL; | |
e63a8e19 | 492 | spin_unlock_irqrestore(&se_tpg->session_lock, flags); |
c66ac9db NB |
493 | |
494 | /* | |
495 | * Determine if we need to do extra work for this initiator node's | |
496 | * struct se_node_acl if it had been previously dynamically generated. | |
497 | */ | |
498 | se_nacl = se_sess->se_node_acl; | |
01468346 | 499 | |
403edd78 | 500 | mutex_lock(&se_tpg->acl_node_mutex); |
01468346 NB |
501 | if (se_nacl && se_nacl->dynamic_node_acl) { |
502 | if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) { | |
503 | list_del(&se_nacl->acl_list); | |
504 | se_tpg->num_node_acls--; | |
403edd78 | 505 | drop_nacl = true; |
c66ac9db | 506 | } |
c66ac9db | 507 | } |
403edd78 | 508 | mutex_unlock(&se_tpg->acl_node_mutex); |
c66ac9db | 509 | |
403edd78 NB |
510 | if (drop_nacl) { |
511 | core_tpg_wait_for_nacl_pr_ref(se_nacl); | |
512 | core_free_device_list_for_node(se_nacl, se_tpg); | |
513 | kfree(se_nacl); | |
514 | comp_nacl = false; | |
515 | } | |
6708bb27 | 516 | pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n", |
e3d6f909 | 517 | se_tpg->se_tpg_tfo->get_fabric_name()); |
01468346 | 518 | /* |
125d0119 | 519 | * If last kref is dropping now for an explicit NodeACL, awake sleeping |
afb999ff NB |
520 | * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group |
521 | * removal context. | |
01468346 | 522 | */ |
0bcc297e | 523 | if (se_nacl && comp_nacl) |
afb999ff | 524 | target_put_nacl(se_nacl); |
01468346 | 525 | |
afb999ff | 526 | transport_free_session(se_sess); |
c66ac9db NB |
527 | } |
528 | EXPORT_SYMBOL(transport_deregister_session); | |
529 | ||
530 | /* | |
a1d8b49a | 531 | * Called with cmd->t_state_lock held. |
c66ac9db | 532 | */ |
cf572a96 | 533 | static void target_remove_from_state_list(struct se_cmd *cmd) |
c66ac9db | 534 | { |
42bf829e | 535 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
536 | unsigned long flags; |
537 | ||
42bf829e CH |
538 | if (!dev) |
539 | return; | |
c66ac9db | 540 | |
cf572a96 CH |
541 | if (cmd->transport_state & CMD_T_BUSY) |
542 | return; | |
c66ac9db | 543 | |
cf572a96 CH |
544 | spin_lock_irqsave(&dev->execute_task_lock, flags); |
545 | if (cmd->state_active) { | |
546 | list_del(&cmd->state_list); | |
cf572a96 | 547 | cmd->state_active = false; |
c66ac9db | 548 | } |
cf572a96 | 549 | spin_unlock_irqrestore(&dev->execute_task_lock, flags); |
c66ac9db NB |
550 | } |
551 | ||
862e6389 NB |
552 | static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists, |
553 | bool write_pending) | |
c66ac9db NB |
554 | { |
555 | unsigned long flags; | |
556 | ||
a1d8b49a | 557 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
862e6389 NB |
558 | if (write_pending) |
559 | cmd->t_state = TRANSPORT_WRITE_PENDING; | |
560 | ||
f7113a47 CH |
561 | if (remove_from_lists) { |
562 | target_remove_from_state_list(cmd); | |
563 | ||
564 | /* | |
565 | * Clear struct se_cmd->se_lun before the handoff to FE. | |
566 | */ | |
567 | cmd->se_lun = NULL; | |
568 | } | |
569 | ||
c66ac9db NB |
570 | /* |
571 | * Determine if frontend context caller is requesting the stopping of | |
e3d6f909 | 572 | * this command for frontend exceptions. |
c66ac9db | 573 | */ |
7d680f3b | 574 | if (cmd->transport_state & CMD_T_STOP) { |
649ee054 BVA |
575 | pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n", |
576 | __func__, __LINE__, cmd->tag); | |
c66ac9db | 577 | |
a1d8b49a | 578 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 579 | |
a95d6511 | 580 | complete_all(&cmd->t_transport_stop_comp); |
c66ac9db NB |
581 | return 1; |
582 | } | |
f7113a47 CH |
583 | |
584 | cmd->transport_state &= ~CMD_T_ACTIVE; | |
585 | if (remove_from_lists) { | |
586 | /* | |
587 | * Some fabric modules like tcm_loop can release | |
588 | * their internally allocated I/O reference now and | |
589 | * struct se_cmd now. | |
590 | * | |
591 | * Fabric modules are expected to return '1' here if the | |
592 | * se_cmd being passed is released at this point, | |
593 | * or zero if not being released. | |
594 | */ | |
595 | if (cmd->se_tfo->check_stop_free != NULL) { | |
596 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
597 | return cmd->se_tfo->check_stop_free(cmd); | |
c66ac9db | 598 | } |
f7113a47 | 599 | } |
c66ac9db | 600 | |
a1d8b49a | 601 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
602 | return 0; |
603 | } | |
604 | ||
605 | static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd) | |
606 | { | |
862e6389 | 607 | return transport_cmd_check_stop(cmd, true, false); |
c66ac9db NB |
608 | } |
609 | ||
610 | static void transport_lun_remove_cmd(struct se_cmd *cmd) | |
611 | { | |
e3d6f909 | 612 | struct se_lun *lun = cmd->se_lun; |
c66ac9db | 613 | |
5259a06e | 614 | if (!lun) |
c66ac9db NB |
615 | return; |
616 | ||
5259a06e NB |
617 | if (cmpxchg(&cmd->lun_ref_active, true, false)) |
618 | percpu_ref_put(&lun->lun_ref); | |
c66ac9db NB |
619 | } |
620 | ||
621 | void transport_cmd_finish_abort(struct se_cmd *cmd, int remove) | |
622 | { | |
68259b5a AL |
623 | if (cmd->se_cmd_flags & SCF_SE_LUN_CMD) |
624 | transport_lun_remove_cmd(cmd); | |
131e6abc NB |
625 | /* |
626 | * Allow the fabric driver to unmap any resources before | |
627 | * releasing the descriptor via TFO->release_cmd() | |
628 | */ | |
629 | if (remove) | |
630 | cmd->se_tfo->aborted_task(cmd); | |
68259b5a | 631 | |
c66ac9db NB |
632 | if (transport_cmd_check_stop_to_fabric(cmd)) |
633 | return; | |
af877292 | 634 | if (remove) |
e6a2573f | 635 | transport_put_cmd(cmd); |
c66ac9db NB |
636 | } |
637 | ||
35e0e757 CH |
638 | static void target_complete_failure_work(struct work_struct *work) |
639 | { | |
640 | struct se_cmd *cmd = container_of(work, struct se_cmd, work); | |
641 | ||
de103c93 CH |
642 | transport_generic_request_failure(cmd, |
643 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE); | |
35e0e757 CH |
644 | } |
645 | ||
6138ed2a | 646 | /* |
d5829eac PB |
647 | * Used when asking transport to copy Sense Data from the underlying |
648 | * Linux/SCSI struct scsi_cmnd | |
6138ed2a | 649 | */ |
d5829eac | 650 | static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd) |
6138ed2a | 651 | { |
6138ed2a | 652 | struct se_device *dev = cmd->se_dev; |
6138ed2a PB |
653 | |
654 | WARN_ON(!cmd->se_lun); | |
655 | ||
656 | if (!dev) | |
d5829eac | 657 | return NULL; |
6138ed2a | 658 | |
d5829eac PB |
659 | if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) |
660 | return NULL; | |
6138ed2a | 661 | |
9c58b7dd | 662 | cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER; |
6138ed2a | 663 | |
d5829eac | 664 | pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n", |
6138ed2a | 665 | dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status); |
9c58b7dd | 666 | return cmd->sense_buffer; |
6138ed2a PB |
667 | } |
668 | ||
5787cacd | 669 | void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status) |
c66ac9db | 670 | { |
42bf829e | 671 | struct se_device *dev = cmd->se_dev; |
5787cacd | 672 | int success = scsi_status == GOOD; |
c66ac9db | 673 | unsigned long flags; |
c66ac9db | 674 | |
5787cacd CH |
675 | cmd->scsi_status = scsi_status; |
676 | ||
677 | ||
a1d8b49a | 678 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
cf572a96 | 679 | cmd->transport_state &= ~CMD_T_BUSY; |
c66ac9db | 680 | |
c66ac9db | 681 | if (dev && dev->transport->transport_complete) { |
d5829eac PB |
682 | dev->transport->transport_complete(cmd, |
683 | cmd->t_data_sg, | |
684 | transport_get_sense_buffer(cmd)); | |
685 | if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) | |
c66ac9db | 686 | success = 1; |
c66ac9db NB |
687 | } |
688 | ||
689 | /* | |
5787cacd | 690 | * See if we are waiting to complete for an exception condition. |
c66ac9db | 691 | */ |
cf572a96 | 692 | if (cmd->transport_state & CMD_T_REQUEST_STOP) { |
a1d8b49a | 693 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
cf572a96 | 694 | complete(&cmd->task_stop_comp); |
c66ac9db NB |
695 | return; |
696 | } | |
2235007c | 697 | |
3d28934a | 698 | /* |
125d0119 | 699 | * Check for case where an explicit ABORT_TASK has been received |
3d28934a NB |
700 | * and transport_wait_for_tasks() will be waiting for completion.. |
701 | */ | |
702 | if (cmd->transport_state & CMD_T_ABORTED && | |
703 | cmd->transport_state & CMD_T_STOP) { | |
704 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
a95d6511 | 705 | complete_all(&cmd->t_transport_stop_comp); |
3d28934a | 706 | return; |
3dca1471 | 707 | } else if (!success) { |
35e0e757 | 708 | INIT_WORK(&cmd->work, target_complete_failure_work); |
c66ac9db | 709 | } else { |
35e0e757 | 710 | INIT_WORK(&cmd->work, target_complete_ok_work); |
c66ac9db | 711 | } |
35e0e757 | 712 | |
35e0e757 | 713 | cmd->t_state = TRANSPORT_COMPLETE; |
3d28934a | 714 | cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE); |
a1d8b49a | 715 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 716 | |
35e0e757 | 717 | queue_work(target_completion_wq, &cmd->work); |
c66ac9db | 718 | } |
6bb35e00 CH |
719 | EXPORT_SYMBOL(target_complete_cmd); |
720 | ||
2426bd45 RD |
721 | void target_complete_cmd_with_length(struct se_cmd *cmd, u8 scsi_status, int length) |
722 | { | |
723 | if (scsi_status == SAM_STAT_GOOD && length < cmd->data_length) { | |
724 | if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) { | |
725 | cmd->residual_count += cmd->data_length - length; | |
726 | } else { | |
727 | cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT; | |
728 | cmd->residual_count = cmd->data_length - length; | |
729 | } | |
730 | ||
731 | cmd->data_length = length; | |
732 | } | |
733 | ||
734 | target_complete_cmd(cmd, scsi_status); | |
735 | } | |
736 | EXPORT_SYMBOL(target_complete_cmd_with_length); | |
737 | ||
cf572a96 | 738 | static void target_add_to_state_list(struct se_cmd *cmd) |
c66ac9db | 739 | { |
cf572a96 CH |
740 | struct se_device *dev = cmd->se_dev; |
741 | unsigned long flags; | |
c66ac9db | 742 | |
cf572a96 CH |
743 | spin_lock_irqsave(&dev->execute_task_lock, flags); |
744 | if (!cmd->state_active) { | |
745 | list_add_tail(&cmd->state_list, &dev->state_list); | |
746 | cmd->state_active = true; | |
c66ac9db | 747 | } |
cf572a96 | 748 | spin_unlock_irqrestore(&dev->execute_task_lock, flags); |
c66ac9db NB |
749 | } |
750 | ||
07bde79a | 751 | /* |
f147abb4 | 752 | * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status |
07bde79a | 753 | */ |
7a6f0a1e CH |
754 | static void transport_write_pending_qf(struct se_cmd *cmd); |
755 | static void transport_complete_qf(struct se_cmd *cmd); | |
07bde79a | 756 | |
0fd97ccf | 757 | void target_qf_do_work(struct work_struct *work) |
07bde79a NB |
758 | { |
759 | struct se_device *dev = container_of(work, struct se_device, | |
760 | qf_work_queue); | |
bcac364a | 761 | LIST_HEAD(qf_cmd_list); |
07bde79a NB |
762 | struct se_cmd *cmd, *cmd_tmp; |
763 | ||
764 | spin_lock_irq(&dev->qf_cmd_lock); | |
bcac364a RD |
765 | list_splice_init(&dev->qf_cmd_list, &qf_cmd_list); |
766 | spin_unlock_irq(&dev->qf_cmd_lock); | |
07bde79a | 767 | |
bcac364a | 768 | list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) { |
07bde79a | 769 | list_del(&cmd->se_qf_node); |
33940d09 | 770 | atomic_dec_mb(&dev->dev_qf_count); |
07bde79a | 771 | |
6708bb27 | 772 | pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue" |
07bde79a | 773 | " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd, |
e057f533 | 774 | (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" : |
07bde79a NB |
775 | (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING" |
776 | : "UNKNOWN"); | |
f7a5cc0b | 777 | |
7a6f0a1e CH |
778 | if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) |
779 | transport_write_pending_qf(cmd); | |
780 | else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) | |
781 | transport_complete_qf(cmd); | |
07bde79a | 782 | } |
07bde79a NB |
783 | } |
784 | ||
c66ac9db NB |
785 | unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd) |
786 | { | |
787 | switch (cmd->data_direction) { | |
788 | case DMA_NONE: | |
789 | return "NONE"; | |
790 | case DMA_FROM_DEVICE: | |
791 | return "READ"; | |
792 | case DMA_TO_DEVICE: | |
793 | return "WRITE"; | |
794 | case DMA_BIDIRECTIONAL: | |
795 | return "BIDI"; | |
796 | default: | |
797 | break; | |
798 | } | |
799 | ||
800 | return "UNKNOWN"; | |
801 | } | |
802 | ||
803 | void transport_dump_dev_state( | |
804 | struct se_device *dev, | |
805 | char *b, | |
806 | int *bl) | |
807 | { | |
808 | *bl += sprintf(b + *bl, "Status: "); | |
0fd97ccf | 809 | if (dev->export_count) |
c66ac9db | 810 | *bl += sprintf(b + *bl, "ACTIVATED"); |
0fd97ccf | 811 | else |
c66ac9db | 812 | *bl += sprintf(b + *bl, "DEACTIVATED"); |
c66ac9db | 813 | |
5f41a31d | 814 | *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth); |
11e764bd | 815 | *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n", |
0fd97ccf CH |
816 | dev->dev_attrib.block_size, |
817 | dev->dev_attrib.hw_max_sectors); | |
c66ac9db NB |
818 | *bl += sprintf(b + *bl, " "); |
819 | } | |
820 | ||
c66ac9db NB |
821 | void transport_dump_vpd_proto_id( |
822 | struct t10_vpd *vpd, | |
823 | unsigned char *p_buf, | |
824 | int p_buf_len) | |
825 | { | |
826 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
827 | int len; | |
828 | ||
829 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
830 | len = sprintf(buf, "T10 VPD Protocol Identifier: "); | |
831 | ||
832 | switch (vpd->protocol_identifier) { | |
833 | case 0x00: | |
834 | sprintf(buf+len, "Fibre Channel\n"); | |
835 | break; | |
836 | case 0x10: | |
837 | sprintf(buf+len, "Parallel SCSI\n"); | |
838 | break; | |
839 | case 0x20: | |
840 | sprintf(buf+len, "SSA\n"); | |
841 | break; | |
842 | case 0x30: | |
843 | sprintf(buf+len, "IEEE 1394\n"); | |
844 | break; | |
845 | case 0x40: | |
846 | sprintf(buf+len, "SCSI Remote Direct Memory Access" | |
847 | " Protocol\n"); | |
848 | break; | |
849 | case 0x50: | |
850 | sprintf(buf+len, "Internet SCSI (iSCSI)\n"); | |
851 | break; | |
852 | case 0x60: | |
853 | sprintf(buf+len, "SAS Serial SCSI Protocol\n"); | |
854 | break; | |
855 | case 0x70: | |
856 | sprintf(buf+len, "Automation/Drive Interface Transport" | |
857 | " Protocol\n"); | |
858 | break; | |
859 | case 0x80: | |
860 | sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n"); | |
861 | break; | |
862 | default: | |
863 | sprintf(buf+len, "Unknown 0x%02x\n", | |
864 | vpd->protocol_identifier); | |
865 | break; | |
866 | } | |
867 | ||
868 | if (p_buf) | |
869 | strncpy(p_buf, buf, p_buf_len); | |
870 | else | |
6708bb27 | 871 | pr_debug("%s", buf); |
c66ac9db NB |
872 | } |
873 | ||
874 | void | |
875 | transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83) | |
876 | { | |
877 | /* | |
878 | * Check if the Protocol Identifier Valid (PIV) bit is set.. | |
879 | * | |
880 | * from spc3r23.pdf section 7.5.1 | |
881 | */ | |
882 | if (page_83[1] & 0x80) { | |
883 | vpd->protocol_identifier = (page_83[0] & 0xf0); | |
884 | vpd->protocol_identifier_set = 1; | |
885 | transport_dump_vpd_proto_id(vpd, NULL, 0); | |
886 | } | |
887 | } | |
888 | EXPORT_SYMBOL(transport_set_vpd_proto_id); | |
889 | ||
890 | int transport_dump_vpd_assoc( | |
891 | struct t10_vpd *vpd, | |
892 | unsigned char *p_buf, | |
893 | int p_buf_len) | |
894 | { | |
895 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
e3d6f909 AG |
896 | int ret = 0; |
897 | int len; | |
c66ac9db NB |
898 | |
899 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
900 | len = sprintf(buf, "T10 VPD Identifier Association: "); | |
901 | ||
902 | switch (vpd->association) { | |
903 | case 0x00: | |
904 | sprintf(buf+len, "addressed logical unit\n"); | |
905 | break; | |
906 | case 0x10: | |
907 | sprintf(buf+len, "target port\n"); | |
908 | break; | |
909 | case 0x20: | |
910 | sprintf(buf+len, "SCSI target device\n"); | |
911 | break; | |
912 | default: | |
913 | sprintf(buf+len, "Unknown 0x%02x\n", vpd->association); | |
e3d6f909 | 914 | ret = -EINVAL; |
c66ac9db NB |
915 | break; |
916 | } | |
917 | ||
918 | if (p_buf) | |
919 | strncpy(p_buf, buf, p_buf_len); | |
920 | else | |
6708bb27 | 921 | pr_debug("%s", buf); |
c66ac9db NB |
922 | |
923 | return ret; | |
924 | } | |
925 | ||
926 | int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83) | |
927 | { | |
928 | /* | |
929 | * The VPD identification association.. | |
930 | * | |
931 | * from spc3r23.pdf Section 7.6.3.1 Table 297 | |
932 | */ | |
933 | vpd->association = (page_83[1] & 0x30); | |
934 | return transport_dump_vpd_assoc(vpd, NULL, 0); | |
935 | } | |
936 | EXPORT_SYMBOL(transport_set_vpd_assoc); | |
937 | ||
938 | int transport_dump_vpd_ident_type( | |
939 | struct t10_vpd *vpd, | |
940 | unsigned char *p_buf, | |
941 | int p_buf_len) | |
942 | { | |
943 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
e3d6f909 AG |
944 | int ret = 0; |
945 | int len; | |
c66ac9db NB |
946 | |
947 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
948 | len = sprintf(buf, "T10 VPD Identifier Type: "); | |
949 | ||
950 | switch (vpd->device_identifier_type) { | |
951 | case 0x00: | |
952 | sprintf(buf+len, "Vendor specific\n"); | |
953 | break; | |
954 | case 0x01: | |
955 | sprintf(buf+len, "T10 Vendor ID based\n"); | |
956 | break; | |
957 | case 0x02: | |
958 | sprintf(buf+len, "EUI-64 based\n"); | |
959 | break; | |
960 | case 0x03: | |
961 | sprintf(buf+len, "NAA\n"); | |
962 | break; | |
963 | case 0x04: | |
964 | sprintf(buf+len, "Relative target port identifier\n"); | |
965 | break; | |
966 | case 0x08: | |
967 | sprintf(buf+len, "SCSI name string\n"); | |
968 | break; | |
969 | default: | |
970 | sprintf(buf+len, "Unsupported: 0x%02x\n", | |
971 | vpd->device_identifier_type); | |
e3d6f909 | 972 | ret = -EINVAL; |
c66ac9db NB |
973 | break; |
974 | } | |
975 | ||
e3d6f909 AG |
976 | if (p_buf) { |
977 | if (p_buf_len < strlen(buf)+1) | |
978 | return -EINVAL; | |
c66ac9db | 979 | strncpy(p_buf, buf, p_buf_len); |
e3d6f909 | 980 | } else { |
6708bb27 | 981 | pr_debug("%s", buf); |
e3d6f909 | 982 | } |
c66ac9db NB |
983 | |
984 | return ret; | |
985 | } | |
986 | ||
987 | int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83) | |
988 | { | |
989 | /* | |
990 | * The VPD identifier type.. | |
991 | * | |
992 | * from spc3r23.pdf Section 7.6.3.1 Table 298 | |
993 | */ | |
994 | vpd->device_identifier_type = (page_83[1] & 0x0f); | |
995 | return transport_dump_vpd_ident_type(vpd, NULL, 0); | |
996 | } | |
997 | EXPORT_SYMBOL(transport_set_vpd_ident_type); | |
998 | ||
999 | int transport_dump_vpd_ident( | |
1000 | struct t10_vpd *vpd, | |
1001 | unsigned char *p_buf, | |
1002 | int p_buf_len) | |
1003 | { | |
1004 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
1005 | int ret = 0; | |
1006 | ||
1007 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
1008 | ||
1009 | switch (vpd->device_identifier_code_set) { | |
1010 | case 0x01: /* Binary */ | |
703d641d DC |
1011 | snprintf(buf, sizeof(buf), |
1012 | "T10 VPD Binary Device Identifier: %s\n", | |
c66ac9db NB |
1013 | &vpd->device_identifier[0]); |
1014 | break; | |
1015 | case 0x02: /* ASCII */ | |
703d641d DC |
1016 | snprintf(buf, sizeof(buf), |
1017 | "T10 VPD ASCII Device Identifier: %s\n", | |
c66ac9db NB |
1018 | &vpd->device_identifier[0]); |
1019 | break; | |
1020 | case 0x03: /* UTF-8 */ | |
703d641d DC |
1021 | snprintf(buf, sizeof(buf), |
1022 | "T10 VPD UTF-8 Device Identifier: %s\n", | |
c66ac9db NB |
1023 | &vpd->device_identifier[0]); |
1024 | break; | |
1025 | default: | |
1026 | sprintf(buf, "T10 VPD Device Identifier encoding unsupported:" | |
1027 | " 0x%02x", vpd->device_identifier_code_set); | |
e3d6f909 | 1028 | ret = -EINVAL; |
c66ac9db NB |
1029 | break; |
1030 | } | |
1031 | ||
1032 | if (p_buf) | |
1033 | strncpy(p_buf, buf, p_buf_len); | |
1034 | else | |
6708bb27 | 1035 | pr_debug("%s", buf); |
c66ac9db NB |
1036 | |
1037 | return ret; | |
1038 | } | |
1039 | ||
1040 | int | |
1041 | transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83) | |
1042 | { | |
1043 | static const char hex_str[] = "0123456789abcdef"; | |
35d1efe8 | 1044 | int j = 0, i = 4; /* offset to start of the identifier */ |
c66ac9db NB |
1045 | |
1046 | /* | |
1047 | * The VPD Code Set (encoding) | |
1048 | * | |
1049 | * from spc3r23.pdf Section 7.6.3.1 Table 296 | |
1050 | */ | |
1051 | vpd->device_identifier_code_set = (page_83[0] & 0x0f); | |
1052 | switch (vpd->device_identifier_code_set) { | |
1053 | case 0x01: /* Binary */ | |
1054 | vpd->device_identifier[j++] = | |
1055 | hex_str[vpd->device_identifier_type]; | |
1056 | while (i < (4 + page_83[3])) { | |
1057 | vpd->device_identifier[j++] = | |
1058 | hex_str[(page_83[i] & 0xf0) >> 4]; | |
1059 | vpd->device_identifier[j++] = | |
1060 | hex_str[page_83[i] & 0x0f]; | |
1061 | i++; | |
1062 | } | |
1063 | break; | |
1064 | case 0x02: /* ASCII */ | |
1065 | case 0x03: /* UTF-8 */ | |
1066 | while (i < (4 + page_83[3])) | |
1067 | vpd->device_identifier[j++] = page_83[i++]; | |
1068 | break; | |
1069 | default: | |
1070 | break; | |
1071 | } | |
1072 | ||
1073 | return transport_dump_vpd_ident(vpd, NULL, 0); | |
1074 | } | |
1075 | EXPORT_SYMBOL(transport_set_vpd_ident); | |
1076 | ||
de103c93 CH |
1077 | sense_reason_t |
1078 | target_cmd_size_check(struct se_cmd *cmd, unsigned int size) | |
9b3b8041 CH |
1079 | { |
1080 | struct se_device *dev = cmd->se_dev; | |
1081 | ||
1082 | if (cmd->unknown_data_length) { | |
1083 | cmd->data_length = size; | |
1084 | } else if (size != cmd->data_length) { | |
1085 | pr_warn("TARGET_CORE[%s]: Expected Transfer Length:" | |
1086 | " %u does not match SCSI CDB Length: %u for SAM Opcode:" | |
1087 | " 0x%02x\n", cmd->se_tfo->get_fabric_name(), | |
1088 | cmd->data_length, size, cmd->t_task_cdb[0]); | |
1089 | ||
9b3b8041 CH |
1090 | if (cmd->data_direction == DMA_TO_DEVICE) { |
1091 | pr_err("Rejecting underflow/overflow" | |
1092 | " WRITE data\n"); | |
de103c93 | 1093 | return TCM_INVALID_CDB_FIELD; |
9b3b8041 CH |
1094 | } |
1095 | /* | |
1096 | * Reject READ_* or WRITE_* with overflow/underflow for | |
1097 | * type SCF_SCSI_DATA_CDB. | |
1098 | */ | |
0fd97ccf | 1099 | if (dev->dev_attrib.block_size != 512) { |
9b3b8041 CH |
1100 | pr_err("Failing OVERFLOW/UNDERFLOW for LBA op" |
1101 | " CDB on non 512-byte sector setup subsystem" | |
1102 | " plugin: %s\n", dev->transport->name); | |
1103 | /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */ | |
de103c93 | 1104 | return TCM_INVALID_CDB_FIELD; |
9b3b8041 | 1105 | } |
4c054ba6 NB |
1106 | /* |
1107 | * For the overflow case keep the existing fabric provided | |
1108 | * ->data_length. Otherwise for the underflow case, reset | |
1109 | * ->data_length to the smaller SCSI expected data transfer | |
1110 | * length. | |
1111 | */ | |
9b3b8041 CH |
1112 | if (size > cmd->data_length) { |
1113 | cmd->se_cmd_flags |= SCF_OVERFLOW_BIT; | |
1114 | cmd->residual_count = (size - cmd->data_length); | |
1115 | } else { | |
1116 | cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT; | |
1117 | cmd->residual_count = (cmd->data_length - size); | |
4c054ba6 | 1118 | cmd->data_length = size; |
9b3b8041 | 1119 | } |
9b3b8041 CH |
1120 | } |
1121 | ||
1122 | return 0; | |
1123 | ||
9b3b8041 CH |
1124 | } |
1125 | ||
c66ac9db NB |
1126 | /* |
1127 | * Used by fabric modules containing a local struct se_cmd within their | |
1128 | * fabric dependent per I/O descriptor. | |
649ee054 BVA |
1129 | * |
1130 | * Preserves the value of @cmd->tag. | |
c66ac9db NB |
1131 | */ |
1132 | void transport_init_se_cmd( | |
1133 | struct se_cmd *cmd, | |
9ac8928e | 1134 | const struct target_core_fabric_ops *tfo, |
c66ac9db NB |
1135 | struct se_session *se_sess, |
1136 | u32 data_length, | |
1137 | int data_direction, | |
1138 | int task_attr, | |
1139 | unsigned char *sense_buffer) | |
1140 | { | |
5951146d | 1141 | INIT_LIST_HEAD(&cmd->se_delayed_node); |
07bde79a | 1142 | INIT_LIST_HEAD(&cmd->se_qf_node); |
a17f091d | 1143 | INIT_LIST_HEAD(&cmd->se_cmd_list); |
cf572a96 | 1144 | INIT_LIST_HEAD(&cmd->state_list); |
a1d8b49a | 1145 | init_completion(&cmd->t_transport_stop_comp); |
a17f091d | 1146 | init_completion(&cmd->cmd_wait_comp); |
cf572a96 | 1147 | init_completion(&cmd->task_stop_comp); |
a1d8b49a | 1148 | spin_lock_init(&cmd->t_state_lock); |
1e1110c4 | 1149 | kref_init(&cmd->cmd_kref); |
7d680f3b | 1150 | cmd->transport_state = CMD_T_DEV_ACTIVE; |
c66ac9db NB |
1151 | |
1152 | cmd->se_tfo = tfo; | |
1153 | cmd->se_sess = se_sess; | |
1154 | cmd->data_length = data_length; | |
1155 | cmd->data_direction = data_direction; | |
1156 | cmd->sam_task_attr = task_attr; | |
1157 | cmd->sense_buffer = sense_buffer; | |
cf572a96 CH |
1158 | |
1159 | cmd->state_active = false; | |
c66ac9db NB |
1160 | } |
1161 | EXPORT_SYMBOL(transport_init_se_cmd); | |
1162 | ||
de103c93 CH |
1163 | static sense_reason_t |
1164 | transport_check_alloc_task_attr(struct se_cmd *cmd) | |
c66ac9db | 1165 | { |
019c4ca6 CH |
1166 | struct se_device *dev = cmd->se_dev; |
1167 | ||
c66ac9db NB |
1168 | /* |
1169 | * Check if SAM Task Attribute emulation is enabled for this | |
1170 | * struct se_device storage object | |
1171 | */ | |
a3541703 | 1172 | if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH) |
c66ac9db NB |
1173 | return 0; |
1174 | ||
68d81f40 | 1175 | if (cmd->sam_task_attr == TCM_ACA_TAG) { |
6708bb27 | 1176 | pr_debug("SAM Task Attribute ACA" |
c66ac9db | 1177 | " emulation is not supported\n"); |
de103c93 | 1178 | return TCM_INVALID_CDB_FIELD; |
c66ac9db NB |
1179 | } |
1180 | /* | |
1181 | * Used to determine when ORDERED commands should go from | |
1182 | * Dormant to Active status. | |
1183 | */ | |
019c4ca6 | 1184 | cmd->se_ordered_id = atomic_inc_return(&dev->dev_ordered_id); |
6708bb27 | 1185 | pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n", |
c66ac9db | 1186 | cmd->se_ordered_id, cmd->sam_task_attr, |
019c4ca6 | 1187 | dev->transport->name); |
c66ac9db NB |
1188 | return 0; |
1189 | } | |
1190 | ||
de103c93 CH |
1191 | sense_reason_t |
1192 | target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb) | |
c66ac9db | 1193 | { |
0fd97ccf | 1194 | struct se_device *dev = cmd->se_dev; |
de103c93 | 1195 | sense_reason_t ret; |
c66ac9db | 1196 | |
c66ac9db NB |
1197 | /* |
1198 | * Ensure that the received CDB is less than the max (252 + 8) bytes | |
1199 | * for VARIABLE_LENGTH_CMD | |
1200 | */ | |
1201 | if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) { | |
6708bb27 | 1202 | pr_err("Received SCSI CDB with command_size: %d that" |
c66ac9db NB |
1203 | " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n", |
1204 | scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE); | |
de103c93 | 1205 | return TCM_INVALID_CDB_FIELD; |
c66ac9db NB |
1206 | } |
1207 | /* | |
1208 | * If the received CDB is larger than TCM_MAX_COMMAND_SIZE, | |
1209 | * allocate the additional extended CDB buffer now.. Otherwise | |
1210 | * setup the pointer from __t_task_cdb to t_task_cdb. | |
1211 | */ | |
a1d8b49a AG |
1212 | if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) { |
1213 | cmd->t_task_cdb = kzalloc(scsi_command_size(cdb), | |
c66ac9db | 1214 | GFP_KERNEL); |
6708bb27 AG |
1215 | if (!cmd->t_task_cdb) { |
1216 | pr_err("Unable to allocate cmd->t_task_cdb" | |
a1d8b49a | 1217 | " %u > sizeof(cmd->__t_task_cdb): %lu ops\n", |
c66ac9db | 1218 | scsi_command_size(cdb), |
a1d8b49a | 1219 | (unsigned long)sizeof(cmd->__t_task_cdb)); |
de103c93 | 1220 | return TCM_OUT_OF_RESOURCES; |
c66ac9db NB |
1221 | } |
1222 | } else | |
a1d8b49a | 1223 | cmd->t_task_cdb = &cmd->__t_task_cdb[0]; |
c66ac9db | 1224 | /* |
a1d8b49a | 1225 | * Copy the original CDB into cmd-> |
c66ac9db | 1226 | */ |
a1d8b49a | 1227 | memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb)); |
cb4f4d3c | 1228 | |
e5c0d6ad RD |
1229 | trace_target_sequencer_start(cmd); |
1230 | ||
cb4f4d3c CH |
1231 | /* |
1232 | * Check for an existing UNIT ATTENTION condition | |
1233 | */ | |
de103c93 CH |
1234 | ret = target_scsi3_ua_check(cmd); |
1235 | if (ret) | |
1236 | return ret; | |
cb4f4d3c | 1237 | |
c87fbd56 | 1238 | ret = target_alua_state_check(cmd); |
de103c93 CH |
1239 | if (ret) |
1240 | return ret; | |
cb4f4d3c | 1241 | |
d977f437 | 1242 | ret = target_check_reservation(cmd); |
f85eda8d NB |
1243 | if (ret) { |
1244 | cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT; | |
d977f437 | 1245 | return ret; |
f85eda8d | 1246 | } |
cb4f4d3c | 1247 | |
0fd97ccf | 1248 | ret = dev->transport->parse_cdb(cmd); |
de103c93 CH |
1249 | if (ret) |
1250 | return ret; | |
1251 | ||
1252 | ret = transport_check_alloc_task_attr(cmd); | |
1253 | if (ret) | |
c66ac9db | 1254 | return ret; |
cb4f4d3c | 1255 | |
cb4f4d3c | 1256 | cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE; |
4cc987ea | 1257 | atomic_long_inc(&cmd->se_lun->lun_stats.cmd_pdus); |
c66ac9db NB |
1258 | return 0; |
1259 | } | |
a12f41f8 | 1260 | EXPORT_SYMBOL(target_setup_cmd_from_cdb); |
c66ac9db | 1261 | |
695434e1 NB |
1262 | /* |
1263 | * Used by fabric module frontends to queue tasks directly. | |
1264 | * Many only be used from process context only | |
1265 | */ | |
1266 | int transport_handle_cdb_direct( | |
1267 | struct se_cmd *cmd) | |
1268 | { | |
de103c93 | 1269 | sense_reason_t ret; |
dd8ae59d | 1270 | |
695434e1 NB |
1271 | if (!cmd->se_lun) { |
1272 | dump_stack(); | |
6708bb27 | 1273 | pr_err("cmd->se_lun is NULL\n"); |
695434e1 NB |
1274 | return -EINVAL; |
1275 | } | |
1276 | if (in_interrupt()) { | |
1277 | dump_stack(); | |
6708bb27 | 1278 | pr_err("transport_generic_handle_cdb cannot be called" |
695434e1 NB |
1279 | " from interrupt context\n"); |
1280 | return -EINVAL; | |
1281 | } | |
dd8ae59d | 1282 | /* |
af877292 CH |
1283 | * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that |
1284 | * outstanding descriptors are handled correctly during shutdown via | |
1285 | * transport_wait_for_tasks() | |
dd8ae59d NB |
1286 | * |
1287 | * Also, we don't take cmd->t_state_lock here as we only expect | |
1288 | * this to be called for initial descriptor submission. | |
1289 | */ | |
1290 | cmd->t_state = TRANSPORT_NEW_CMD; | |
7d680f3b CH |
1291 | cmd->transport_state |= CMD_T_ACTIVE; |
1292 | ||
dd8ae59d NB |
1293 | /* |
1294 | * transport_generic_new_cmd() is already handling QUEUE_FULL, | |
1295 | * so follow TRANSPORT_NEW_CMD processing thread context usage | |
1296 | * and call transport_generic_request_failure() if necessary.. | |
1297 | */ | |
1298 | ret = transport_generic_new_cmd(cmd); | |
de103c93 CH |
1299 | if (ret) |
1300 | transport_generic_request_failure(cmd, ret); | |
dd8ae59d | 1301 | return 0; |
695434e1 NB |
1302 | } |
1303 | EXPORT_SYMBOL(transport_handle_cdb_direct); | |
1304 | ||
c5ff8d6b | 1305 | sense_reason_t |
de103c93 CH |
1306 | transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl, |
1307 | u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count) | |
1308 | { | |
1309 | if (!sgl || !sgl_count) | |
1310 | return 0; | |
1311 | ||
1312 | /* | |
1313 | * Reject SCSI data overflow with map_mem_to_cmd() as incoming | |
1314 | * scatterlists already have been set to follow what the fabric | |
1315 | * passes for the original expected data transfer length. | |
1316 | */ | |
1317 | if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) { | |
1318 | pr_warn("Rejecting SCSI DATA overflow for fabric using" | |
1319 | " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n"); | |
1320 | return TCM_INVALID_CDB_FIELD; | |
1321 | } | |
1322 | ||
1323 | cmd->t_data_sg = sgl; | |
1324 | cmd->t_data_nents = sgl_count; | |
b32bd0a8 IT |
1325 | cmd->t_bidi_data_sg = sgl_bidi; |
1326 | cmd->t_bidi_data_nents = sgl_bidi_count; | |
de103c93 | 1327 | |
de103c93 CH |
1328 | cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC; |
1329 | return 0; | |
1330 | } | |
1331 | ||
a026757f NB |
1332 | /* |
1333 | * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized | |
1334 | * se_cmd + use pre-allocated SGL memory. | |
a6360785 NB |
1335 | * |
1336 | * @se_cmd: command descriptor to submit | |
1337 | * @se_sess: associated se_sess for endpoint | |
1338 | * @cdb: pointer to SCSI CDB | |
1339 | * @sense: pointer to SCSI sense buffer | |
1340 | * @unpacked_lun: unpacked LUN to reference for struct se_lun | |
1341 | * @data_length: fabric expected data transfer length | |
1342 | * @task_addr: SAM task attribute | |
1343 | * @data_dir: DMA data direction | |
1344 | * @flags: flags for command submission from target_sc_flags_tables | |
a026757f NB |
1345 | * @sgl: struct scatterlist memory for unidirectional mapping |
1346 | * @sgl_count: scatterlist count for unidirectional mapping | |
1347 | * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping | |
1348 | * @sgl_bidi_count: scatterlist count for bidirectional READ mapping | |
def2b339 NB |
1349 | * @sgl_prot: struct scatterlist memory protection information |
1350 | * @sgl_prot_count: scatterlist count for protection information | |
a6360785 | 1351 | * |
649ee054 BVA |
1352 | * Task tags are supported if the caller has set @se_cmd->tag. |
1353 | * | |
d6dfc868 RD |
1354 | * Returns non zero to signal active I/O shutdown failure. All other |
1355 | * setup exceptions will be returned as a SCSI CHECK_CONDITION response, | |
1356 | * but still return zero here. | |
1357 | * | |
a6360785 NB |
1358 | * This may only be called from process context, and also currently |
1359 | * assumes internal allocation of fabric payload buffer by target-core. | |
a026757f NB |
1360 | */ |
1361 | int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess, | |
f2d30680 | 1362 | unsigned char *cdb, unsigned char *sense, u64 unpacked_lun, |
a026757f NB |
1363 | u32 data_length, int task_attr, int data_dir, int flags, |
1364 | struct scatterlist *sgl, u32 sgl_count, | |
def2b339 NB |
1365 | struct scatterlist *sgl_bidi, u32 sgl_bidi_count, |
1366 | struct scatterlist *sgl_prot, u32 sgl_prot_count) | |
a6360785 NB |
1367 | { |
1368 | struct se_portal_group *se_tpg; | |
de103c93 CH |
1369 | sense_reason_t rc; |
1370 | int ret; | |
a6360785 NB |
1371 | |
1372 | se_tpg = se_sess->se_tpg; | |
1373 | BUG_ON(!se_tpg); | |
1374 | BUG_ON(se_cmd->se_tfo || se_cmd->se_sess); | |
1375 | BUG_ON(in_interrupt()); | |
1376 | /* | |
1377 | * Initialize se_cmd for target operation. From this point | |
1378 | * exceptions are handled by sending exception status via | |
1379 | * target_core_fabric_ops->queue_status() callback | |
1380 | */ | |
1381 | transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, | |
1382 | data_length, data_dir, task_attr, sense); | |
b0d79946 SAS |
1383 | if (flags & TARGET_SCF_UNKNOWN_SIZE) |
1384 | se_cmd->unknown_data_length = 1; | |
a6360785 NB |
1385 | /* |
1386 | * Obtain struct se_cmd->cmd_kref reference and add new cmd to | |
1387 | * se_sess->sess_cmd_list. A second kref_get here is necessary | |
1388 | * for fabrics using TARGET_SCF_ACK_KREF that expect a second | |
1389 | * kref_put() to happen during fabric packet acknowledgement. | |
1390 | */ | |
afc16604 | 1391 | ret = target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF); |
de103c93 CH |
1392 | if (ret) |
1393 | return ret; | |
a6360785 NB |
1394 | /* |
1395 | * Signal bidirectional data payloads to target-core | |
1396 | */ | |
1397 | if (flags & TARGET_SCF_BIDI_OP) | |
1398 | se_cmd->se_cmd_flags |= SCF_BIDI; | |
1399 | /* | |
1400 | * Locate se_lun pointer and attach it to struct se_cmd | |
1401 | */ | |
de103c93 CH |
1402 | rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun); |
1403 | if (rc) { | |
1404 | transport_send_check_condition_and_sense(se_cmd, rc, 0); | |
afc16604 | 1405 | target_put_sess_cmd(se_cmd); |
d6dfc868 | 1406 | return 0; |
735703ca | 1407 | } |
b5b8e298 SG |
1408 | |
1409 | rc = target_setup_cmd_from_cdb(se_cmd, cdb); | |
1410 | if (rc != 0) { | |
1411 | transport_generic_request_failure(se_cmd, rc); | |
1412 | return 0; | |
1413 | } | |
1414 | ||
def2b339 NB |
1415 | /* |
1416 | * Save pointers for SGLs containing protection information, | |
1417 | * if present. | |
1418 | */ | |
1419 | if (sgl_prot_count) { | |
1420 | se_cmd->t_prot_sg = sgl_prot; | |
1421 | se_cmd->t_prot_nents = sgl_prot_count; | |
5835812f | 1422 | se_cmd->se_cmd_flags |= SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC; |
def2b339 | 1423 | } |
d6e0175c | 1424 | |
a026757f NB |
1425 | /* |
1426 | * When a non zero sgl_count has been passed perform SGL passthrough | |
1427 | * mapping for pre-allocated fabric memory instead of having target | |
1428 | * core perform an internal SGL allocation.. | |
1429 | */ | |
1430 | if (sgl_count != 0) { | |
1431 | BUG_ON(!sgl); | |
1432 | ||
944981c7 NB |
1433 | /* |
1434 | * A work-around for tcm_loop as some userspace code via | |
1435 | * scsi-generic do not memset their associated read buffers, | |
1436 | * so go ahead and do that here for type non-data CDBs. Also | |
1437 | * note that this is currently guaranteed to be a single SGL | |
1438 | * for this case by target core in target_setup_cmd_from_cdb() | |
1439 | * -> transport_generic_cmd_sequencer(). | |
1440 | */ | |
1441 | if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) && | |
1442 | se_cmd->data_direction == DMA_FROM_DEVICE) { | |
1443 | unsigned char *buf = NULL; | |
1444 | ||
1445 | if (sgl) | |
1446 | buf = kmap(sg_page(sgl)) + sgl->offset; | |
1447 | ||
1448 | if (buf) { | |
1449 | memset(buf, 0, sgl->length); | |
1450 | kunmap(sg_page(sgl)); | |
1451 | } | |
1452 | } | |
1453 | ||
a026757f NB |
1454 | rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count, |
1455 | sgl_bidi, sgl_bidi_count); | |
1456 | if (rc != 0) { | |
de103c93 | 1457 | transport_generic_request_failure(se_cmd, rc); |
a026757f NB |
1458 | return 0; |
1459 | } | |
1460 | } | |
def2b339 | 1461 | |
11e319ed AG |
1462 | /* |
1463 | * Check if we need to delay processing because of ALUA | |
1464 | * Active/NonOptimized primary access state.. | |
1465 | */ | |
1466 | core_alua_check_nonop_delay(se_cmd); | |
1467 | ||
a6360785 | 1468 | transport_handle_cdb_direct(se_cmd); |
d6dfc868 | 1469 | return 0; |
a6360785 | 1470 | } |
a026757f NB |
1471 | EXPORT_SYMBOL(target_submit_cmd_map_sgls); |
1472 | ||
1473 | /* | |
1474 | * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd | |
1475 | * | |
1476 | * @se_cmd: command descriptor to submit | |
1477 | * @se_sess: associated se_sess for endpoint | |
1478 | * @cdb: pointer to SCSI CDB | |
1479 | * @sense: pointer to SCSI sense buffer | |
1480 | * @unpacked_lun: unpacked LUN to reference for struct se_lun | |
1481 | * @data_length: fabric expected data transfer length | |
1482 | * @task_addr: SAM task attribute | |
1483 | * @data_dir: DMA data direction | |
1484 | * @flags: flags for command submission from target_sc_flags_tables | |
1485 | * | |
649ee054 BVA |
1486 | * Task tags are supported if the caller has set @se_cmd->tag. |
1487 | * | |
a026757f NB |
1488 | * Returns non zero to signal active I/O shutdown failure. All other |
1489 | * setup exceptions will be returned as a SCSI CHECK_CONDITION response, | |
1490 | * but still return zero here. | |
1491 | * | |
1492 | * This may only be called from process context, and also currently | |
1493 | * assumes internal allocation of fabric payload buffer by target-core. | |
1494 | * | |
1495 | * It also assumes interal target core SGL memory allocation. | |
1496 | */ | |
1497 | int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess, | |
f2d30680 | 1498 | unsigned char *cdb, unsigned char *sense, u64 unpacked_lun, |
a026757f NB |
1499 | u32 data_length, int task_attr, int data_dir, int flags) |
1500 | { | |
1501 | return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense, | |
1502 | unpacked_lun, data_length, task_attr, data_dir, | |
def2b339 | 1503 | flags, NULL, 0, NULL, 0, NULL, 0); |
a026757f | 1504 | } |
a6360785 NB |
1505 | EXPORT_SYMBOL(target_submit_cmd); |
1506 | ||
9f0d05c2 NB |
1507 | static void target_complete_tmr_failure(struct work_struct *work) |
1508 | { | |
1509 | struct se_cmd *se_cmd = container_of(work, struct se_cmd, work); | |
1510 | ||
1511 | se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST; | |
1512 | se_cmd->se_tfo->queue_tm_rsp(se_cmd); | |
5a3b6fc0 RD |
1513 | |
1514 | transport_cmd_check_stop_to_fabric(se_cmd); | |
9f0d05c2 NB |
1515 | } |
1516 | ||
ea98d7f9 AG |
1517 | /** |
1518 | * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd | |
1519 | * for TMR CDBs | |
1520 | * | |
1521 | * @se_cmd: command descriptor to submit | |
1522 | * @se_sess: associated se_sess for endpoint | |
1523 | * @sense: pointer to SCSI sense buffer | |
1524 | * @unpacked_lun: unpacked LUN to reference for struct se_lun | |
1525 | * @fabric_context: fabric context for TMR req | |
1526 | * @tm_type: Type of TM request | |
c0974f89 NB |
1527 | * @gfp: gfp type for caller |
1528 | * @tag: referenced task tag for TMR_ABORT_TASK | |
c7042cae | 1529 | * @flags: submit cmd flags |
ea98d7f9 AG |
1530 | * |
1531 | * Callable from all contexts. | |
1532 | **/ | |
1533 | ||
c7042cae | 1534 | int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess, |
f2d30680 | 1535 | unsigned char *sense, u64 unpacked_lun, |
c0974f89 NB |
1536 | void *fabric_tmr_ptr, unsigned char tm_type, |
1537 | gfp_t gfp, unsigned int tag, int flags) | |
ea98d7f9 AG |
1538 | { |
1539 | struct se_portal_group *se_tpg; | |
1540 | int ret; | |
1541 | ||
1542 | se_tpg = se_sess->se_tpg; | |
1543 | BUG_ON(!se_tpg); | |
1544 | ||
1545 | transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, | |
68d81f40 | 1546 | 0, DMA_NONE, TCM_SIMPLE_TAG, sense); |
c7042cae NB |
1547 | /* |
1548 | * FIXME: Currently expect caller to handle se_cmd->se_tmr_req | |
1549 | * allocation failure. | |
1550 | */ | |
c0974f89 | 1551 | ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp); |
c7042cae NB |
1552 | if (ret < 0) |
1553 | return -ENOMEM; | |
ea98d7f9 | 1554 | |
c0974f89 NB |
1555 | if (tm_type == TMR_ABORT_TASK) |
1556 | se_cmd->se_tmr_req->ref_task_tag = tag; | |
1557 | ||
ea98d7f9 | 1558 | /* See target_submit_cmd for commentary */ |
afc16604 | 1559 | ret = target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF); |
bc187ea6 RD |
1560 | if (ret) { |
1561 | core_tmr_release_req(se_cmd->se_tmr_req); | |
1562 | return ret; | |
1563 | } | |
ea98d7f9 | 1564 | |
ea98d7f9 AG |
1565 | ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun); |
1566 | if (ret) { | |
9f0d05c2 NB |
1567 | /* |
1568 | * For callback during failure handling, push this work off | |
1569 | * to process context with TMR_LUN_DOES_NOT_EXIST status. | |
1570 | */ | |
1571 | INIT_WORK(&se_cmd->work, target_complete_tmr_failure); | |
1572 | schedule_work(&se_cmd->work); | |
c7042cae | 1573 | return 0; |
ea98d7f9 AG |
1574 | } |
1575 | transport_generic_handle_tmr(se_cmd); | |
c7042cae | 1576 | return 0; |
ea98d7f9 AG |
1577 | } |
1578 | EXPORT_SYMBOL(target_submit_tmr); | |
1579 | ||
cdbb70bb | 1580 | /* |
cf572a96 | 1581 | * If the cmd is active, request it to be stopped and sleep until it |
cdbb70bb CH |
1582 | * has completed. |
1583 | */ | |
cf572a96 | 1584 | bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags) |
cb0df4d3 BVA |
1585 | __releases(&cmd->t_state_lock) |
1586 | __acquires(&cmd->t_state_lock) | |
cdbb70bb | 1587 | { |
cdbb70bb CH |
1588 | bool was_active = false; |
1589 | ||
cf572a96 CH |
1590 | if (cmd->transport_state & CMD_T_BUSY) { |
1591 | cmd->transport_state |= CMD_T_REQUEST_STOP; | |
cdbb70bb CH |
1592 | spin_unlock_irqrestore(&cmd->t_state_lock, *flags); |
1593 | ||
cf572a96 CH |
1594 | pr_debug("cmd %p waiting to complete\n", cmd); |
1595 | wait_for_completion(&cmd->task_stop_comp); | |
1596 | pr_debug("cmd %p stopped successfully\n", cmd); | |
cdbb70bb CH |
1597 | |
1598 | spin_lock_irqsave(&cmd->t_state_lock, *flags); | |
cf572a96 CH |
1599 | cmd->transport_state &= ~CMD_T_REQUEST_STOP; |
1600 | cmd->transport_state &= ~CMD_T_BUSY; | |
cdbb70bb CH |
1601 | was_active = true; |
1602 | } | |
1603 | ||
cdbb70bb CH |
1604 | return was_active; |
1605 | } | |
1606 | ||
c66ac9db NB |
1607 | /* |
1608 | * Handle SAM-esque emulation for generic transport request failures. | |
1609 | */ | |
de103c93 CH |
1610 | void transport_generic_request_failure(struct se_cmd *cmd, |
1611 | sense_reason_t sense_reason) | |
c66ac9db | 1612 | { |
07bde79a NB |
1613 | int ret = 0; |
1614 | ||
649ee054 BVA |
1615 | pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08llx" |
1616 | " CDB: 0x%02x\n", cmd, cmd->tag, cmd->t_task_cdb[0]); | |
de103c93 | 1617 | pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n", |
e3d6f909 | 1618 | cmd->se_tfo->get_cmd_state(cmd), |
de103c93 | 1619 | cmd->t_state, sense_reason); |
d43d6aea | 1620 | pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n", |
7d680f3b CH |
1621 | (cmd->transport_state & CMD_T_ACTIVE) != 0, |
1622 | (cmd->transport_state & CMD_T_STOP) != 0, | |
1623 | (cmd->transport_state & CMD_T_SENT) != 0); | |
c66ac9db | 1624 | |
c66ac9db NB |
1625 | /* |
1626 | * For SAM Task Attribute emulation for failed struct se_cmd | |
1627 | */ | |
019c4ca6 | 1628 | transport_complete_task_attr(cmd); |
cf6d1f09 NB |
1629 | /* |
1630 | * Handle special case for COMPARE_AND_WRITE failure, where the | |
c8e63985 | 1631 | * callback is expected to drop the per device ->caw_sem. |
cf6d1f09 NB |
1632 | */ |
1633 | if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) && | |
1634 | cmd->transport_complete_callback) | |
c8e63985 | 1635 | cmd->transport_complete_callback(cmd, false); |
c66ac9db | 1636 | |
de103c93 | 1637 | switch (sense_reason) { |
03e98c9e NB |
1638 | case TCM_NON_EXISTENT_LUN: |
1639 | case TCM_UNSUPPORTED_SCSI_OPCODE: | |
1640 | case TCM_INVALID_CDB_FIELD: | |
1641 | case TCM_INVALID_PARAMETER_LIST: | |
bb992e72 | 1642 | case TCM_PARAMETER_LIST_LENGTH_ERROR: |
03e98c9e NB |
1643 | case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE: |
1644 | case TCM_UNKNOWN_MODE_PAGE: | |
1645 | case TCM_WRITE_PROTECTED: | |
e2397c70 | 1646 | case TCM_ADDRESS_OUT_OF_RANGE: |
03e98c9e NB |
1647 | case TCM_CHECK_CONDITION_ABORT_CMD: |
1648 | case TCM_CHECK_CONDITION_UNIT_ATTENTION: | |
1649 | case TCM_CHECK_CONDITION_NOT_READY: | |
94387aa7 NB |
1650 | case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED: |
1651 | case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED: | |
1652 | case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED: | |
c66ac9db | 1653 | break; |
de103c93 CH |
1654 | case TCM_OUT_OF_RESOURCES: |
1655 | sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
1656 | break; | |
03e98c9e | 1657 | case TCM_RESERVATION_CONFLICT: |
c66ac9db NB |
1658 | /* |
1659 | * No SENSE Data payload for this case, set SCSI Status | |
1660 | * and queue the response to $FABRIC_MOD. | |
1661 | * | |
1662 | * Uses linux/include/scsi/scsi.h SAM status codes defs | |
1663 | */ | |
1664 | cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT; | |
1665 | /* | |
1666 | * For UA Interlock Code 11b, a RESERVATION CONFLICT will | |
1667 | * establish a UNIT ATTENTION with PREVIOUS RESERVATION | |
1668 | * CONFLICT STATUS. | |
1669 | * | |
1670 | * See spc4r17, section 7.4.6 Control Mode Page, Table 349 | |
1671 | */ | |
e3d6f909 | 1672 | if (cmd->se_sess && |
c51c8e7b HR |
1673 | cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2) { |
1674 | target_ua_allocate_lun(cmd->se_sess->se_node_acl, | |
1675 | cmd->orig_fe_lun, 0x2C, | |
1676 | ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS); | |
1677 | } | |
e5c0d6ad | 1678 | trace_target_cmd_complete(cmd); |
c51c8e7b | 1679 | ret = cmd->se_tfo->queue_status(cmd); |
f147abb4 | 1680 | if (ret == -EAGAIN || ret == -ENOMEM) |
07bde79a | 1681 | goto queue_full; |
c66ac9db | 1682 | goto check_stop; |
c66ac9db | 1683 | default: |
6708bb27 | 1684 | pr_err("Unknown transport error for CDB 0x%02x: %d\n", |
de103c93 CH |
1685 | cmd->t_task_cdb[0], sense_reason); |
1686 | sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; | |
c66ac9db NB |
1687 | break; |
1688 | } | |
f3146437 | 1689 | |
de103c93 | 1690 | ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0); |
03e98c9e NB |
1691 | if (ret == -EAGAIN || ret == -ENOMEM) |
1692 | goto queue_full; | |
07bde79a | 1693 | |
c66ac9db NB |
1694 | check_stop: |
1695 | transport_lun_remove_cmd(cmd); | |
6708bb27 | 1696 | if (!transport_cmd_check_stop_to_fabric(cmd)) |
c66ac9db | 1697 | ; |
07bde79a NB |
1698 | return; |
1699 | ||
1700 | queue_full: | |
e057f533 CH |
1701 | cmd->t_state = TRANSPORT_COMPLETE_QF_OK; |
1702 | transport_handle_queue_full(cmd, cmd->se_dev); | |
c66ac9db | 1703 | } |
2fbff127 | 1704 | EXPORT_SYMBOL(transport_generic_request_failure); |
c66ac9db | 1705 | |
76dde50e | 1706 | void __target_execute_cmd(struct se_cmd *cmd) |
c66ac9db | 1707 | { |
de103c93 | 1708 | sense_reason_t ret; |
5f41a31d | 1709 | |
de103c93 CH |
1710 | if (cmd->execute_cmd) { |
1711 | ret = cmd->execute_cmd(cmd); | |
1712 | if (ret) { | |
1713 | spin_lock_irq(&cmd->t_state_lock); | |
1714 | cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT); | |
1715 | spin_unlock_irq(&cmd->t_state_lock); | |
5f41a31d | 1716 | |
de103c93 CH |
1717 | transport_generic_request_failure(cmd, ret); |
1718 | } | |
5f41a31d CH |
1719 | } |
1720 | } | |
1721 | ||
aa58b531 NB |
1722 | static int target_write_prot_action(struct se_cmd *cmd) |
1723 | { | |
5132d1e6 | 1724 | u32 sectors; |
aa58b531 NB |
1725 | /* |
1726 | * Perform WRITE_INSERT of PI using software emulation when backend | |
1727 | * device has PI enabled, if the transport has not already generated | |
1728 | * PI using hardware WRITE_INSERT offload. | |
1729 | */ | |
1730 | switch (cmd->prot_op) { | |
1731 | case TARGET_PROT_DOUT_INSERT: | |
1732 | if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_INSERT)) | |
1733 | sbc_dif_generate(cmd); | |
1734 | break; | |
5132d1e6 NB |
1735 | case TARGET_PROT_DOUT_STRIP: |
1736 | if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_STRIP) | |
1737 | break; | |
1738 | ||
1739 | sectors = cmd->data_length >> ilog2(cmd->se_dev->dev_attrib.block_size); | |
f75b6fae SG |
1740 | cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba, |
1741 | sectors, 0, cmd->t_prot_sg, 0); | |
5132d1e6 NB |
1742 | if (unlikely(cmd->pi_err)) { |
1743 | spin_lock_irq(&cmd->t_state_lock); | |
6c2faeaa | 1744 | cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT); |
5132d1e6 NB |
1745 | spin_unlock_irq(&cmd->t_state_lock); |
1746 | transport_generic_request_failure(cmd, cmd->pi_err); | |
1747 | return -1; | |
1748 | } | |
1749 | break; | |
aa58b531 NB |
1750 | default: |
1751 | break; | |
1752 | } | |
1753 | ||
1754 | return 0; | |
1755 | } | |
1756 | ||
019c4ca6 | 1757 | static bool target_handle_task_attr(struct se_cmd *cmd) |
5f41a31d CH |
1758 | { |
1759 | struct se_device *dev = cmd->se_dev; | |
1760 | ||
a3541703 | 1761 | if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH) |
019c4ca6 | 1762 | return false; |
5f41a31d | 1763 | |
c66ac9db | 1764 | /* |
25985edc | 1765 | * Check for the existence of HEAD_OF_QUEUE, and if true return 1 |
c66ac9db NB |
1766 | * to allow the passed struct se_cmd list of tasks to the front of the list. |
1767 | */ | |
5f41a31d | 1768 | switch (cmd->sam_task_attr) { |
68d81f40 | 1769 | case TCM_HEAD_TAG: |
5f41a31d CH |
1770 | pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, " |
1771 | "se_ordered_id: %u\n", | |
1772 | cmd->t_task_cdb[0], cmd->se_ordered_id); | |
019c4ca6 | 1773 | return false; |
68d81f40 | 1774 | case TCM_ORDERED_TAG: |
33940d09 | 1775 | atomic_inc_mb(&dev->dev_ordered_sync); |
c66ac9db | 1776 | |
5f41a31d CH |
1777 | pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, " |
1778 | " se_ordered_id: %u\n", | |
1779 | cmd->t_task_cdb[0], cmd->se_ordered_id); | |
1780 | ||
c66ac9db | 1781 | /* |
5f41a31d CH |
1782 | * Execute an ORDERED command if no other older commands |
1783 | * exist that need to be completed first. | |
c66ac9db | 1784 | */ |
5f41a31d | 1785 | if (!atomic_read(&dev->simple_cmds)) |
019c4ca6 | 1786 | return false; |
5f41a31d CH |
1787 | break; |
1788 | default: | |
c66ac9db NB |
1789 | /* |
1790 | * For SIMPLE and UNTAGGED Task Attribute commands | |
1791 | */ | |
33940d09 | 1792 | atomic_inc_mb(&dev->simple_cmds); |
5f41a31d | 1793 | break; |
c66ac9db | 1794 | } |
5f41a31d | 1795 | |
019c4ca6 CH |
1796 | if (atomic_read(&dev->dev_ordered_sync) == 0) |
1797 | return false; | |
c66ac9db | 1798 | |
019c4ca6 CH |
1799 | spin_lock(&dev->delayed_cmd_lock); |
1800 | list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list); | |
1801 | spin_unlock(&dev->delayed_cmd_lock); | |
1802 | ||
1803 | pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to" | |
1804 | " delayed CMD list, se_ordered_id: %u\n", | |
1805 | cmd->t_task_cdb[0], cmd->sam_task_attr, | |
1806 | cmd->se_ordered_id); | |
1807 | return true; | |
1808 | } | |
1809 | ||
1810 | void target_execute_cmd(struct se_cmd *cmd) | |
1811 | { | |
1812 | /* | |
1813 | * If the received CDB has aleady been aborted stop processing it here. | |
1814 | */ | |
4a9a6c8d | 1815 | if (transport_check_aborted_status(cmd, 1)) |
5f41a31d | 1816 | return; |
c66ac9db | 1817 | |
019c4ca6 CH |
1818 | /* |
1819 | * Determine if frontend context caller is requesting the stopping of | |
1820 | * this command for frontend exceptions. | |
1821 | */ | |
4a9a6c8d | 1822 | spin_lock_irq(&cmd->t_state_lock); |
019c4ca6 | 1823 | if (cmd->transport_state & CMD_T_STOP) { |
649ee054 BVA |
1824 | pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n", |
1825 | __func__, __LINE__, cmd->tag); | |
019c4ca6 CH |
1826 | |
1827 | spin_unlock_irq(&cmd->t_state_lock); | |
a95d6511 | 1828 | complete_all(&cmd->t_transport_stop_comp); |
019c4ca6 CH |
1829 | return; |
1830 | } | |
1831 | ||
1832 | cmd->t_state = TRANSPORT_PROCESSING; | |
1a398b97 | 1833 | cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT; |
019c4ca6 | 1834 | spin_unlock_irq(&cmd->t_state_lock); |
aa58b531 NB |
1835 | |
1836 | if (target_write_prot_action(cmd)) | |
1837 | return; | |
019c4ca6 | 1838 | |
1a398b97 NB |
1839 | if (target_handle_task_attr(cmd)) { |
1840 | spin_lock_irq(&cmd->t_state_lock); | |
6c2faeaa | 1841 | cmd->transport_state &= ~(CMD_T_BUSY | CMD_T_SENT); |
1a398b97 NB |
1842 | spin_unlock_irq(&cmd->t_state_lock); |
1843 | return; | |
1844 | } | |
1845 | ||
1846 | __target_execute_cmd(cmd); | |
c66ac9db | 1847 | } |
70baf0ab | 1848 | EXPORT_SYMBOL(target_execute_cmd); |
c66ac9db | 1849 | |
5f41a31d CH |
1850 | /* |
1851 | * Process all commands up to the last received ORDERED task attribute which | |
1852 | * requires another blocking boundary | |
1853 | */ | |
1854 | static void target_restart_delayed_cmds(struct se_device *dev) | |
1855 | { | |
1856 | for (;;) { | |
1857 | struct se_cmd *cmd; | |
1858 | ||
1859 | spin_lock(&dev->delayed_cmd_lock); | |
1860 | if (list_empty(&dev->delayed_cmd_list)) { | |
1861 | spin_unlock(&dev->delayed_cmd_lock); | |
1862 | break; | |
1863 | } | |
1864 | ||
1865 | cmd = list_entry(dev->delayed_cmd_list.next, | |
1866 | struct se_cmd, se_delayed_node); | |
1867 | list_del(&cmd->se_delayed_node); | |
1868 | spin_unlock(&dev->delayed_cmd_lock); | |
1869 | ||
1870 | __target_execute_cmd(cmd); | |
1871 | ||
68d81f40 | 1872 | if (cmd->sam_task_attr == TCM_ORDERED_TAG) |
5f41a31d CH |
1873 | break; |
1874 | } | |
1875 | } | |
1876 | ||
c66ac9db | 1877 | /* |
35e0e757 | 1878 | * Called from I/O completion to determine which dormant/delayed |
c66ac9db NB |
1879 | * and ordered cmds need to have their tasks added to the execution queue. |
1880 | */ | |
1881 | static void transport_complete_task_attr(struct se_cmd *cmd) | |
1882 | { | |
5951146d | 1883 | struct se_device *dev = cmd->se_dev; |
c66ac9db | 1884 | |
a3541703 | 1885 | if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH) |
019c4ca6 CH |
1886 | return; |
1887 | ||
68d81f40 | 1888 | if (cmd->sam_task_attr == TCM_SIMPLE_TAG) { |
33940d09 | 1889 | atomic_dec_mb(&dev->simple_cmds); |
c66ac9db | 1890 | dev->dev_cur_ordered_id++; |
6708bb27 | 1891 | pr_debug("Incremented dev->dev_cur_ordered_id: %u for" |
c66ac9db NB |
1892 | " SIMPLE: %u\n", dev->dev_cur_ordered_id, |
1893 | cmd->se_ordered_id); | |
68d81f40 | 1894 | } else if (cmd->sam_task_attr == TCM_HEAD_TAG) { |
c66ac9db | 1895 | dev->dev_cur_ordered_id++; |
6708bb27 | 1896 | pr_debug("Incremented dev_cur_ordered_id: %u for" |
c66ac9db NB |
1897 | " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id, |
1898 | cmd->se_ordered_id); | |
68d81f40 | 1899 | } else if (cmd->sam_task_attr == TCM_ORDERED_TAG) { |
33940d09 | 1900 | atomic_dec_mb(&dev->dev_ordered_sync); |
c66ac9db NB |
1901 | |
1902 | dev->dev_cur_ordered_id++; | |
6708bb27 | 1903 | pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:" |
c66ac9db NB |
1904 | " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id); |
1905 | } | |
c66ac9db | 1906 | |
5f41a31d | 1907 | target_restart_delayed_cmds(dev); |
c66ac9db NB |
1908 | } |
1909 | ||
e057f533 | 1910 | static void transport_complete_qf(struct se_cmd *cmd) |
07bde79a NB |
1911 | { |
1912 | int ret = 0; | |
1913 | ||
019c4ca6 | 1914 | transport_complete_task_attr(cmd); |
e057f533 CH |
1915 | |
1916 | if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) { | |
e5c0d6ad | 1917 | trace_target_cmd_complete(cmd); |
e057f533 | 1918 | ret = cmd->se_tfo->queue_status(cmd); |
082f58ac | 1919 | goto out; |
e057f533 | 1920 | } |
07bde79a NB |
1921 | |
1922 | switch (cmd->data_direction) { | |
1923 | case DMA_FROM_DEVICE: | |
e5c0d6ad | 1924 | trace_target_cmd_complete(cmd); |
07bde79a NB |
1925 | ret = cmd->se_tfo->queue_data_in(cmd); |
1926 | break; | |
1927 | case DMA_TO_DEVICE: | |
64577407 | 1928 | if (cmd->se_cmd_flags & SCF_BIDI) { |
07bde79a | 1929 | ret = cmd->se_tfo->queue_data_in(cmd); |
63509c60 | 1930 | break; |
07bde79a NB |
1931 | } |
1932 | /* Fall through for DMA_TO_DEVICE */ | |
1933 | case DMA_NONE: | |
e5c0d6ad | 1934 | trace_target_cmd_complete(cmd); |
07bde79a NB |
1935 | ret = cmd->se_tfo->queue_status(cmd); |
1936 | break; | |
1937 | default: | |
1938 | break; | |
1939 | } | |
1940 | ||
e057f533 CH |
1941 | out: |
1942 | if (ret < 0) { | |
1943 | transport_handle_queue_full(cmd, cmd->se_dev); | |
1944 | return; | |
1945 | } | |
1946 | transport_lun_remove_cmd(cmd); | |
1947 | transport_cmd_check_stop_to_fabric(cmd); | |
07bde79a NB |
1948 | } |
1949 | ||
1950 | static void transport_handle_queue_full( | |
1951 | struct se_cmd *cmd, | |
e057f533 | 1952 | struct se_device *dev) |
07bde79a NB |
1953 | { |
1954 | spin_lock_irq(&dev->qf_cmd_lock); | |
07bde79a | 1955 | list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list); |
33940d09 | 1956 | atomic_inc_mb(&dev->dev_qf_count); |
07bde79a NB |
1957 | spin_unlock_irq(&cmd->se_dev->qf_cmd_lock); |
1958 | ||
1959 | schedule_work(&cmd->se_dev->qf_work_queue); | |
1960 | } | |
1961 | ||
fdeab852 | 1962 | static bool target_read_prot_action(struct se_cmd *cmd) |
bc005869 | 1963 | { |
fdeab852 NB |
1964 | switch (cmd->prot_op) { |
1965 | case TARGET_PROT_DIN_STRIP: | |
1966 | if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_STRIP)) { | |
f75b6fae SG |
1967 | u32 sectors = cmd->data_length >> |
1968 | ilog2(cmd->se_dev->dev_attrib.block_size); | |
1969 | ||
1970 | cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba, | |
1971 | sectors, 0, cmd->t_prot_sg, | |
1972 | 0); | |
1973 | if (cmd->pi_err) | |
fdeab852 | 1974 | return true; |
bc005869 | 1975 | } |
fdeab852 | 1976 | break; |
72c03850 NB |
1977 | case TARGET_PROT_DIN_INSERT: |
1978 | if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_INSERT) | |
1979 | break; | |
1980 | ||
1981 | sbc_dif_generate(cmd); | |
1982 | break; | |
fdeab852 NB |
1983 | default: |
1984 | break; | |
bc005869 NB |
1985 | } |
1986 | ||
1987 | return false; | |
1988 | } | |
1989 | ||
35e0e757 | 1990 | static void target_complete_ok_work(struct work_struct *work) |
c66ac9db | 1991 | { |
35e0e757 | 1992 | struct se_cmd *cmd = container_of(work, struct se_cmd, work); |
27a27099 | 1993 | int ret; |
35e0e757 | 1994 | |
c66ac9db NB |
1995 | /* |
1996 | * Check if we need to move delayed/dormant tasks from cmds on the | |
1997 | * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task | |
1998 | * Attribute. | |
1999 | */ | |
019c4ca6 CH |
2000 | transport_complete_task_attr(cmd); |
2001 | ||
07bde79a NB |
2002 | /* |
2003 | * Check to schedule QUEUE_FULL work, or execute an existing | |
2004 | * cmd->transport_qf_callback() | |
2005 | */ | |
2006 | if (atomic_read(&cmd->se_dev->dev_qf_count) != 0) | |
2007 | schedule_work(&cmd->se_dev->qf_work_queue); | |
2008 | ||
c66ac9db | 2009 | /* |
d5829eac | 2010 | * Check if we need to send a sense buffer from |
c66ac9db NB |
2011 | * the struct se_cmd in question. |
2012 | */ | |
2013 | if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) { | |
27a27099 | 2014 | WARN_ON(!cmd->scsi_status); |
27a27099 PB |
2015 | ret = transport_send_check_condition_and_sense( |
2016 | cmd, 0, 1); | |
2017 | if (ret == -EAGAIN || ret == -ENOMEM) | |
2018 | goto queue_full; | |
2019 | ||
2020 | transport_lun_remove_cmd(cmd); | |
2021 | transport_cmd_check_stop_to_fabric(cmd); | |
2022 | return; | |
c66ac9db NB |
2023 | } |
2024 | /* | |
25985edc | 2025 | * Check for a callback, used by amongst other things |
a6b0133c | 2026 | * XDWRITE_READ_10 and COMPARE_AND_WRITE emulation. |
c66ac9db | 2027 | */ |
a6b0133c NB |
2028 | if (cmd->transport_complete_callback) { |
2029 | sense_reason_t rc; | |
2030 | ||
c8e63985 | 2031 | rc = cmd->transport_complete_callback(cmd, true); |
a2890087 | 2032 | if (!rc && !(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE_POST)) { |
c8e63985 NB |
2033 | if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) && |
2034 | !cmd->data_length) | |
2035 | goto queue_rsp; | |
2036 | ||
a6b0133c | 2037 | return; |
a2890087 NB |
2038 | } else if (rc) { |
2039 | ret = transport_send_check_condition_and_sense(cmd, | |
2040 | rc, 0); | |
2041 | if (ret == -EAGAIN || ret == -ENOMEM) | |
2042 | goto queue_full; | |
a6b0133c | 2043 | |
a2890087 NB |
2044 | transport_lun_remove_cmd(cmd); |
2045 | transport_cmd_check_stop_to_fabric(cmd); | |
2046 | return; | |
2047 | } | |
a6b0133c | 2048 | } |
c66ac9db | 2049 | |
c8e63985 | 2050 | queue_rsp: |
c66ac9db NB |
2051 | switch (cmd->data_direction) { |
2052 | case DMA_FROM_DEVICE: | |
4cc987ea NB |
2053 | atomic_long_add(cmd->data_length, |
2054 | &cmd->se_lun->lun_stats.tx_data_octets); | |
bc005869 NB |
2055 | /* |
2056 | * Perform READ_STRIP of PI using software emulation when | |
2057 | * backend had PI enabled, if the transport will not be | |
2058 | * performing hardware READ_STRIP offload. | |
2059 | */ | |
fdeab852 | 2060 | if (target_read_prot_action(cmd)) { |
bc005869 NB |
2061 | ret = transport_send_check_condition_and_sense(cmd, |
2062 | cmd->pi_err, 0); | |
2063 | if (ret == -EAGAIN || ret == -ENOMEM) | |
2064 | goto queue_full; | |
2065 | ||
2066 | transport_lun_remove_cmd(cmd); | |
2067 | transport_cmd_check_stop_to_fabric(cmd); | |
2068 | return; | |
2069 | } | |
c66ac9db | 2070 | |
e5c0d6ad | 2071 | trace_target_cmd_complete(cmd); |
07bde79a | 2072 | ret = cmd->se_tfo->queue_data_in(cmd); |
f147abb4 | 2073 | if (ret == -EAGAIN || ret == -ENOMEM) |
07bde79a | 2074 | goto queue_full; |
c66ac9db NB |
2075 | break; |
2076 | case DMA_TO_DEVICE: | |
4cc987ea NB |
2077 | atomic_long_add(cmd->data_length, |
2078 | &cmd->se_lun->lun_stats.rx_data_octets); | |
c66ac9db NB |
2079 | /* |
2080 | * Check if we need to send READ payload for BIDI-COMMAND | |
2081 | */ | |
64577407 | 2082 | if (cmd->se_cmd_flags & SCF_BIDI) { |
4cc987ea NB |
2083 | atomic_long_add(cmd->data_length, |
2084 | &cmd->se_lun->lun_stats.tx_data_octets); | |
07bde79a | 2085 | ret = cmd->se_tfo->queue_data_in(cmd); |
f147abb4 | 2086 | if (ret == -EAGAIN || ret == -ENOMEM) |
07bde79a | 2087 | goto queue_full; |
c66ac9db NB |
2088 | break; |
2089 | } | |
2090 | /* Fall through for DMA_TO_DEVICE */ | |
2091 | case DMA_NONE: | |
e5c0d6ad | 2092 | trace_target_cmd_complete(cmd); |
07bde79a | 2093 | ret = cmd->se_tfo->queue_status(cmd); |
f147abb4 | 2094 | if (ret == -EAGAIN || ret == -ENOMEM) |
07bde79a | 2095 | goto queue_full; |
c66ac9db NB |
2096 | break; |
2097 | default: | |
2098 | break; | |
2099 | } | |
2100 | ||
2101 | transport_lun_remove_cmd(cmd); | |
2102 | transport_cmd_check_stop_to_fabric(cmd); | |
07bde79a NB |
2103 | return; |
2104 | ||
2105 | queue_full: | |
6708bb27 | 2106 | pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p," |
07bde79a | 2107 | " data_direction: %d\n", cmd, cmd->data_direction); |
e057f533 CH |
2108 | cmd->t_state = TRANSPORT_COMPLETE_QF_OK; |
2109 | transport_handle_queue_full(cmd, cmd->se_dev); | |
c66ac9db NB |
2110 | } |
2111 | ||
6708bb27 | 2112 | static inline void transport_free_sgl(struct scatterlist *sgl, int nents) |
c66ac9db | 2113 | { |
ec98f782 | 2114 | struct scatterlist *sg; |
ec98f782 | 2115 | int count; |
c66ac9db | 2116 | |
6708bb27 AG |
2117 | for_each_sg(sgl, sg, nents, count) |
2118 | __free_page(sg_page(sg)); | |
c66ac9db | 2119 | |
6708bb27 AG |
2120 | kfree(sgl); |
2121 | } | |
c66ac9db | 2122 | |
47e459e6 NB |
2123 | static inline void transport_reset_sgl_orig(struct se_cmd *cmd) |
2124 | { | |
2125 | /* | |
2126 | * Check for saved t_data_sg that may be used for COMPARE_AND_WRITE | |
2127 | * emulation, and free + reset pointers if necessary.. | |
2128 | */ | |
2129 | if (!cmd->t_data_sg_orig) | |
2130 | return; | |
2131 | ||
2132 | kfree(cmd->t_data_sg); | |
2133 | cmd->t_data_sg = cmd->t_data_sg_orig; | |
2134 | cmd->t_data_sg_orig = NULL; | |
2135 | cmd->t_data_nents = cmd->t_data_nents_orig; | |
2136 | cmd->t_data_nents_orig = 0; | |
2137 | } | |
2138 | ||
6708bb27 AG |
2139 | static inline void transport_free_pages(struct se_cmd *cmd) |
2140 | { | |
5835812f AM |
2141 | if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) { |
2142 | transport_free_sgl(cmd->t_prot_sg, cmd->t_prot_nents); | |
2143 | cmd->t_prot_sg = NULL; | |
2144 | cmd->t_prot_nents = 0; | |
2145 | } | |
2146 | ||
47e459e6 | 2147 | if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) { |
c8e63985 NB |
2148 | /* |
2149 | * Release special case READ buffer payload required for | |
2150 | * SG_TO_MEM_NOALLOC to function with COMPARE_AND_WRITE | |
2151 | */ | |
2152 | if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) { | |
2153 | transport_free_sgl(cmd->t_bidi_data_sg, | |
2154 | cmd->t_bidi_data_nents); | |
2155 | cmd->t_bidi_data_sg = NULL; | |
2156 | cmd->t_bidi_data_nents = 0; | |
2157 | } | |
47e459e6 | 2158 | transport_reset_sgl_orig(cmd); |
6708bb27 | 2159 | return; |
47e459e6 NB |
2160 | } |
2161 | transport_reset_sgl_orig(cmd); | |
6708bb27 AG |
2162 | |
2163 | transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents); | |
ec98f782 AG |
2164 | cmd->t_data_sg = NULL; |
2165 | cmd->t_data_nents = 0; | |
c66ac9db | 2166 | |
6708bb27 | 2167 | transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents); |
ec98f782 AG |
2168 | cmd->t_bidi_data_sg = NULL; |
2169 | cmd->t_bidi_data_nents = 0; | |
c66ac9db NB |
2170 | } |
2171 | ||
e26d99ae CH |
2172 | /** |
2173 | * transport_release_cmd - free a command | |
2174 | * @cmd: command to free | |
2175 | * | |
2176 | * This routine unconditionally frees a command, and reference counting | |
2177 | * or list removal must be done in the caller. | |
2178 | */ | |
d5ddad41 | 2179 | static int transport_release_cmd(struct se_cmd *cmd) |
e26d99ae CH |
2180 | { |
2181 | BUG_ON(!cmd->se_tfo); | |
2182 | ||
c8e31f26 | 2183 | if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB) |
e26d99ae CH |
2184 | core_tmr_release_req(cmd->se_tmr_req); |
2185 | if (cmd->t_task_cdb != cmd->__t_task_cdb) | |
2186 | kfree(cmd->t_task_cdb); | |
2187 | /* | |
7481deb4 NB |
2188 | * If this cmd has been setup with target_get_sess_cmd(), drop |
2189 | * the kref and call ->release_cmd() in kref callback. | |
e26d99ae | 2190 | */ |
afc16604 | 2191 | return target_put_sess_cmd(cmd); |
e26d99ae CH |
2192 | } |
2193 | ||
d3df7825 CH |
2194 | /** |
2195 | * transport_put_cmd - release a reference to a command | |
2196 | * @cmd: command to release | |
2197 | * | |
2198 | * This routine releases our reference to the command and frees it if possible. | |
2199 | */ | |
d5ddad41 | 2200 | static int transport_put_cmd(struct se_cmd *cmd) |
c66ac9db | 2201 | { |
c66ac9db | 2202 | transport_free_pages(cmd); |
d5ddad41 | 2203 | return transport_release_cmd(cmd); |
c66ac9db | 2204 | } |
c66ac9db | 2205 | |
4949314c | 2206 | void *transport_kmap_data_sg(struct se_cmd *cmd) |
05d1c7c0 | 2207 | { |
ec98f782 | 2208 | struct scatterlist *sg = cmd->t_data_sg; |
4949314c AG |
2209 | struct page **pages; |
2210 | int i; | |
05d1c7c0 AG |
2211 | |
2212 | /* | |
ec98f782 AG |
2213 | * We need to take into account a possible offset here for fabrics like |
2214 | * tcm_loop who may be using a contig buffer from the SCSI midlayer for | |
2215 | * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd() | |
05d1c7c0 | 2216 | */ |
4949314c AG |
2217 | if (!cmd->t_data_nents) |
2218 | return NULL; | |
3717ef0c PB |
2219 | |
2220 | BUG_ON(!sg); | |
2221 | if (cmd->t_data_nents == 1) | |
4949314c AG |
2222 | return kmap(sg_page(sg)) + sg->offset; |
2223 | ||
2224 | /* >1 page. use vmap */ | |
2225 | pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL); | |
de103c93 | 2226 | if (!pages) |
4949314c AG |
2227 | return NULL; |
2228 | ||
2229 | /* convert sg[] to pages[] */ | |
2230 | for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) { | |
2231 | pages[i] = sg_page(sg); | |
2232 | } | |
2233 | ||
2234 | cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL); | |
2235 | kfree(pages); | |
de103c93 | 2236 | if (!cmd->t_data_vmap) |
4949314c AG |
2237 | return NULL; |
2238 | ||
2239 | return cmd->t_data_vmap + cmd->t_data_sg[0].offset; | |
05d1c7c0 | 2240 | } |
4949314c | 2241 | EXPORT_SYMBOL(transport_kmap_data_sg); |
05d1c7c0 | 2242 | |
4949314c | 2243 | void transport_kunmap_data_sg(struct se_cmd *cmd) |
05d1c7c0 | 2244 | { |
a1edf9cf | 2245 | if (!cmd->t_data_nents) { |
4949314c | 2246 | return; |
a1edf9cf | 2247 | } else if (cmd->t_data_nents == 1) { |
4949314c | 2248 | kunmap(sg_page(cmd->t_data_sg)); |
a1edf9cf AG |
2249 | return; |
2250 | } | |
4949314c AG |
2251 | |
2252 | vunmap(cmd->t_data_vmap); | |
2253 | cmd->t_data_vmap = NULL; | |
05d1c7c0 | 2254 | } |
4949314c | 2255 | EXPORT_SYMBOL(transport_kunmap_data_sg); |
05d1c7c0 | 2256 | |
c5ff8d6b | 2257 | int |
20093994 NB |
2258 | target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, u32 length, |
2259 | bool zero_page) | |
c66ac9db | 2260 | { |
20093994 | 2261 | struct scatterlist *sg; |
ec98f782 | 2262 | struct page *page; |
20093994 NB |
2263 | gfp_t zero_flag = (zero_page) ? __GFP_ZERO : 0; |
2264 | unsigned int nent; | |
ec98f782 | 2265 | int i = 0; |
c66ac9db | 2266 | |
20093994 NB |
2267 | nent = DIV_ROUND_UP(length, PAGE_SIZE); |
2268 | sg = kmalloc(sizeof(struct scatterlist) * nent, GFP_KERNEL); | |
2269 | if (!sg) | |
ec98f782 | 2270 | return -ENOMEM; |
c66ac9db | 2271 | |
20093994 | 2272 | sg_init_table(sg, nent); |
9db9da33 | 2273 | |
ec98f782 AG |
2274 | while (length) { |
2275 | u32 page_len = min_t(u32, length, PAGE_SIZE); | |
9db9da33 | 2276 | page = alloc_page(GFP_KERNEL | zero_flag); |
ec98f782 AG |
2277 | if (!page) |
2278 | goto out; | |
c66ac9db | 2279 | |
20093994 | 2280 | sg_set_page(&sg[i], page, page_len, 0); |
ec98f782 AG |
2281 | length -= page_len; |
2282 | i++; | |
c66ac9db | 2283 | } |
20093994 NB |
2284 | *sgl = sg; |
2285 | *nents = nent; | |
c66ac9db | 2286 | return 0; |
c66ac9db | 2287 | |
ec98f782 | 2288 | out: |
d0e27c88 | 2289 | while (i > 0) { |
ec98f782 | 2290 | i--; |
20093994 | 2291 | __free_page(sg_page(&sg[i])); |
c66ac9db | 2292 | } |
20093994 | 2293 | kfree(sg); |
ec98f782 | 2294 | return -ENOMEM; |
c66ac9db NB |
2295 | } |
2296 | ||
da0f7619 | 2297 | /* |
b16a35b0 AG |
2298 | * Allocate any required resources to execute the command. For writes we |
2299 | * might not have the payload yet, so notify the fabric via a call to | |
2300 | * ->write_pending instead. Otherwise place it on the execution queue. | |
c66ac9db | 2301 | */ |
de103c93 CH |
2302 | sense_reason_t |
2303 | transport_generic_new_cmd(struct se_cmd *cmd) | |
c66ac9db | 2304 | { |
c66ac9db | 2305 | int ret = 0; |
c8e63985 | 2306 | bool zero_flag = !(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB); |
c66ac9db | 2307 | |
5835812f AM |
2308 | if (cmd->prot_op != TARGET_PROT_NORMAL && |
2309 | !(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) { | |
2310 | ret = target_alloc_sgl(&cmd->t_prot_sg, &cmd->t_prot_nents, | |
2311 | cmd->prot_length, true); | |
2312 | if (ret < 0) | |
2313 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
2314 | } | |
2315 | ||
c66ac9db NB |
2316 | /* |
2317 | * Determine is the TCM fabric module has already allocated physical | |
2318 | * memory, and is directly calling transport_generic_map_mem_to_cmd() | |
ec98f782 | 2319 | * beforehand. |
c66ac9db | 2320 | */ |
ec98f782 AG |
2321 | if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) && |
2322 | cmd->data_length) { | |
20093994 | 2323 | |
8cefe07b NB |
2324 | if ((cmd->se_cmd_flags & SCF_BIDI) || |
2325 | (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) { | |
2326 | u32 bidi_length; | |
2327 | ||
2328 | if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) | |
2329 | bidi_length = cmd->t_task_nolb * | |
2330 | cmd->se_dev->dev_attrib.block_size; | |
2331 | else | |
2332 | bidi_length = cmd->data_length; | |
2333 | ||
2334 | ret = target_alloc_sgl(&cmd->t_bidi_data_sg, | |
2335 | &cmd->t_bidi_data_nents, | |
2336 | bidi_length, zero_flag); | |
2337 | if (ret < 0) | |
2338 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
2339 | } | |
2340 | ||
20093994 NB |
2341 | ret = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents, |
2342 | cmd->data_length, zero_flag); | |
c66ac9db | 2343 | if (ret < 0) |
de103c93 | 2344 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
c8e63985 NB |
2345 | } else if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) && |
2346 | cmd->data_length) { | |
2347 | /* | |
2348 | * Special case for COMPARE_AND_WRITE with fabrics | |
2349 | * using SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC. | |
2350 | */ | |
2351 | u32 caw_length = cmd->t_task_nolb * | |
2352 | cmd->se_dev->dev_attrib.block_size; | |
2353 | ||
2354 | ret = target_alloc_sgl(&cmd->t_bidi_data_sg, | |
2355 | &cmd->t_bidi_data_nents, | |
2356 | caw_length, zero_flag); | |
2357 | if (ret < 0) | |
2358 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
c66ac9db | 2359 | } |
c66ac9db | 2360 | /* |
c3196f0c CH |
2361 | * If this command is not a write we can execute it right here, |
2362 | * for write buffers we need to notify the fabric driver first | |
2363 | * and let it call back once the write buffers are ready. | |
c66ac9db | 2364 | */ |
5f41a31d | 2365 | target_add_to_state_list(cmd); |
885e7b0e | 2366 | if (cmd->data_direction != DMA_TO_DEVICE || cmd->data_length == 0) { |
c3196f0c CH |
2367 | target_execute_cmd(cmd); |
2368 | return 0; | |
2369 | } | |
862e6389 | 2370 | transport_cmd_check_stop(cmd, false, true); |
c3196f0c CH |
2371 | |
2372 | ret = cmd->se_tfo->write_pending(cmd); | |
2373 | if (ret == -EAGAIN || ret == -ENOMEM) | |
2374 | goto queue_full; | |
2375 | ||
de103c93 CH |
2376 | /* fabric drivers should only return -EAGAIN or -ENOMEM as error */ |
2377 | WARN_ON(ret); | |
2378 | ||
b69c1fcf | 2379 | return (!ret) ? 0 : TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
da0f7619 | 2380 | |
c3196f0c CH |
2381 | queue_full: |
2382 | pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd); | |
2383 | cmd->t_state = TRANSPORT_COMPLETE_QF_WP; | |
2384 | transport_handle_queue_full(cmd, cmd->se_dev); | |
2385 | return 0; | |
c66ac9db | 2386 | } |
a1d8b49a | 2387 | EXPORT_SYMBOL(transport_generic_new_cmd); |
c66ac9db | 2388 | |
e057f533 | 2389 | static void transport_write_pending_qf(struct se_cmd *cmd) |
07bde79a | 2390 | { |
f147abb4 NB |
2391 | int ret; |
2392 | ||
2393 | ret = cmd->se_tfo->write_pending(cmd); | |
2394 | if (ret == -EAGAIN || ret == -ENOMEM) { | |
e057f533 CH |
2395 | pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", |
2396 | cmd); | |
2397 | transport_handle_queue_full(cmd, cmd->se_dev); | |
2398 | } | |
07bde79a NB |
2399 | } |
2400 | ||
d5ddad41 | 2401 | int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks) |
c66ac9db | 2402 | { |
c130480b | 2403 | unsigned long flags; |
d5ddad41 NB |
2404 | int ret = 0; |
2405 | ||
d14921d6 | 2406 | if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) { |
c8e31f26 | 2407 | if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) |
d14921d6 NB |
2408 | transport_wait_for_tasks(cmd); |
2409 | ||
d5ddad41 | 2410 | ret = transport_release_cmd(cmd); |
d14921d6 NB |
2411 | } else { |
2412 | if (wait_for_tasks) | |
2413 | transport_wait_for_tasks(cmd); | |
c130480b NB |
2414 | /* |
2415 | * Handle WRITE failure case where transport_generic_new_cmd() | |
2416 | * has already added se_cmd to state_list, but fabric has | |
2417 | * failed command before I/O submission. | |
2418 | */ | |
2419 | if (cmd->state_active) { | |
2420 | spin_lock_irqsave(&cmd->t_state_lock, flags); | |
2421 | target_remove_from_state_list(cmd); | |
2422 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
2423 | } | |
d14921d6 | 2424 | |
82f1c8a4 | 2425 | if (cmd->se_lun) |
c66ac9db | 2426 | transport_lun_remove_cmd(cmd); |
c66ac9db | 2427 | |
d5ddad41 | 2428 | ret = transport_put_cmd(cmd); |
c66ac9db | 2429 | } |
d5ddad41 | 2430 | return ret; |
c66ac9db NB |
2431 | } |
2432 | EXPORT_SYMBOL(transport_generic_free_cmd); | |
2433 | ||
a17f091d | 2434 | /* target_get_sess_cmd - Add command to active ->sess_cmd_list |
a17f091d | 2435 | * @se_cmd: command descriptor to add |
a6360785 | 2436 | * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd() |
a17f091d | 2437 | */ |
afc16604 | 2438 | int target_get_sess_cmd(struct se_cmd *se_cmd, bool ack_kref) |
a17f091d | 2439 | { |
afc16604 | 2440 | struct se_session *se_sess = se_cmd->se_sess; |
a17f091d | 2441 | unsigned long flags; |
bc187ea6 | 2442 | int ret = 0; |
a17f091d | 2443 | |
a6360785 NB |
2444 | /* |
2445 | * Add a second kref if the fabric caller is expecting to handle | |
2446 | * fabric acknowledgement that requires two target_put_sess_cmd() | |
2447 | * invocations before se_cmd descriptor release. | |
2448 | */ | |
054922bb | 2449 | if (ack_kref) |
a6360785 | 2450 | kref_get(&se_cmd->cmd_kref); |
7481deb4 | 2451 | |
a17f091d | 2452 | spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); |
bc187ea6 RD |
2453 | if (se_sess->sess_tearing_down) { |
2454 | ret = -ESHUTDOWN; | |
2455 | goto out; | |
2456 | } | |
a17f091d | 2457 | list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list); |
bc187ea6 | 2458 | out: |
a17f091d | 2459 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); |
7544e597 BVA |
2460 | |
2461 | if (ret && ack_kref) | |
afc16604 | 2462 | target_put_sess_cmd(se_cmd); |
7544e597 | 2463 | |
bc187ea6 | 2464 | return ret; |
a17f091d | 2465 | } |
20361e69 | 2466 | EXPORT_SYMBOL(target_get_sess_cmd); |
a17f091d | 2467 | |
7481deb4 | 2468 | static void target_release_cmd_kref(struct kref *kref) |
077aa3b2 | 2469 | __releases(&se_cmd->se_sess->sess_cmd_lock) |
a17f091d | 2470 | { |
7481deb4 NB |
2471 | struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref); |
2472 | struct se_session *se_sess = se_cmd->se_sess; | |
a17f091d | 2473 | |
a17f091d | 2474 | if (list_empty(&se_cmd->se_cmd_list)) { |
ccf5ae83 | 2475 | spin_unlock(&se_sess->sess_cmd_lock); |
ffc32d52 | 2476 | se_cmd->se_tfo->release_cmd(se_cmd); |
7481deb4 | 2477 | return; |
a17f091d | 2478 | } |
a17f091d | 2479 | if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) { |
ccf5ae83 | 2480 | spin_unlock(&se_sess->sess_cmd_lock); |
a17f091d | 2481 | complete(&se_cmd->cmd_wait_comp); |
7481deb4 | 2482 | return; |
a17f091d NB |
2483 | } |
2484 | list_del(&se_cmd->se_cmd_list); | |
ccf5ae83 | 2485 | spin_unlock(&se_sess->sess_cmd_lock); |
a17f091d | 2486 | |
7481deb4 NB |
2487 | se_cmd->se_tfo->release_cmd(se_cmd); |
2488 | } | |
2489 | ||
2490 | /* target_put_sess_cmd - Check for active I/O shutdown via kref_put | |
7481deb4 NB |
2491 | * @se_cmd: command descriptor to drop |
2492 | */ | |
afc16604 | 2493 | int target_put_sess_cmd(struct se_cmd *se_cmd) |
7481deb4 | 2494 | { |
afc16604 BVA |
2495 | struct se_session *se_sess = se_cmd->se_sess; |
2496 | ||
0ed6e189 NB |
2497 | if (!se_sess) { |
2498 | se_cmd->se_tfo->release_cmd(se_cmd); | |
2499 | return 1; | |
2500 | } | |
ccf5ae83 JE |
2501 | return kref_put_spinlock_irqsave(&se_cmd->cmd_kref, target_release_cmd_kref, |
2502 | &se_sess->sess_cmd_lock); | |
a17f091d NB |
2503 | } |
2504 | EXPORT_SYMBOL(target_put_sess_cmd); | |
2505 | ||
1c7b13fe RD |
2506 | /* target_sess_cmd_list_set_waiting - Flag all commands in |
2507 | * sess_cmd_list to complete cmd_wait_comp. Set | |
2508 | * sess_tearing_down so no more commands are queued. | |
2509 | * @se_sess: session to flag | |
a17f091d | 2510 | */ |
1c7b13fe | 2511 | void target_sess_cmd_list_set_waiting(struct se_session *se_sess) |
a17f091d NB |
2512 | { |
2513 | struct se_cmd *se_cmd; | |
2514 | unsigned long flags; | |
2515 | ||
a17f091d | 2516 | spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); |
9b31a328 NB |
2517 | if (se_sess->sess_tearing_down) { |
2518 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); | |
2519 | return; | |
2520 | } | |
1c7b13fe | 2521 | se_sess->sess_tearing_down = 1; |
9b31a328 | 2522 | list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list); |
a17f091d | 2523 | |
9b31a328 | 2524 | list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list) |
a17f091d NB |
2525 | se_cmd->cmd_wait_set = 1; |
2526 | ||
2527 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); | |
2528 | } | |
1c7b13fe | 2529 | EXPORT_SYMBOL(target_sess_cmd_list_set_waiting); |
a17f091d NB |
2530 | |
2531 | /* target_wait_for_sess_cmds - Wait for outstanding descriptors | |
2532 | * @se_sess: session to wait for active I/O | |
a17f091d | 2533 | */ |
be646c2d | 2534 | void target_wait_for_sess_cmds(struct se_session *se_sess) |
a17f091d NB |
2535 | { |
2536 | struct se_cmd *se_cmd, *tmp_cmd; | |
9b31a328 | 2537 | unsigned long flags; |
a17f091d NB |
2538 | |
2539 | list_for_each_entry_safe(se_cmd, tmp_cmd, | |
9b31a328 | 2540 | &se_sess->sess_wait_list, se_cmd_list) { |
a17f091d NB |
2541 | list_del(&se_cmd->se_cmd_list); |
2542 | ||
2543 | pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:" | |
2544 | " %d\n", se_cmd, se_cmd->t_state, | |
2545 | se_cmd->se_tfo->get_cmd_state(se_cmd)); | |
2546 | ||
be646c2d JE |
2547 | wait_for_completion(&se_cmd->cmd_wait_comp); |
2548 | pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d" | |
2549 | " fabric state: %d\n", se_cmd, se_cmd->t_state, | |
2550 | se_cmd->se_tfo->get_cmd_state(se_cmd)); | |
a17f091d NB |
2551 | |
2552 | se_cmd->se_tfo->release_cmd(se_cmd); | |
2553 | } | |
9b31a328 NB |
2554 | |
2555 | spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); | |
2556 | WARN_ON(!list_empty(&se_sess->sess_cmd_list)); | |
2557 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); | |
2558 | ||
a17f091d NB |
2559 | } |
2560 | EXPORT_SYMBOL(target_wait_for_sess_cmds); | |
2561 | ||
b3eeea66 | 2562 | void transport_clear_lun_ref(struct se_lun *lun) |
c66ac9db | 2563 | { |
5277797d | 2564 | percpu_ref_kill(&lun->lun_ref); |
5277797d | 2565 | wait_for_completion(&lun->lun_ref_comp); |
c66ac9db NB |
2566 | } |
2567 | ||
d14921d6 NB |
2568 | /** |
2569 | * transport_wait_for_tasks - wait for completion to occur | |
2570 | * @cmd: command to wait | |
c66ac9db | 2571 | * |
d14921d6 NB |
2572 | * Called from frontend fabric context to wait for storage engine |
2573 | * to pause and/or release frontend generated struct se_cmd. | |
c66ac9db | 2574 | */ |
a17f091d | 2575 | bool transport_wait_for_tasks(struct se_cmd *cmd) |
c66ac9db NB |
2576 | { |
2577 | unsigned long flags; | |
2578 | ||
a1d8b49a | 2579 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c8e31f26 AG |
2580 | if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && |
2581 | !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) { | |
d14921d6 | 2582 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
a17f091d | 2583 | return false; |
d14921d6 | 2584 | } |
cb4f4d3c | 2585 | |
c8e31f26 AG |
2586 | if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) && |
2587 | !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) { | |
d14921d6 | 2588 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
a17f091d | 2589 | return false; |
d14921d6 | 2590 | } |
7d680f3b | 2591 | |
3d28934a | 2592 | if (!(cmd->transport_state & CMD_T_ACTIVE)) { |
d14921d6 | 2593 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
a17f091d | 2594 | return false; |
d14921d6 | 2595 | } |
c66ac9db | 2596 | |
7d680f3b | 2597 | cmd->transport_state |= CMD_T_STOP; |
c66ac9db | 2598 | |
649ee054 BVA |
2599 | pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08llx i_state: %d, t_state: %d, CMD_T_STOP\n", |
2600 | cmd, cmd->tag, cmd->se_tfo->get_cmd_state(cmd), cmd->t_state); | |
c66ac9db | 2601 | |
a1d8b49a | 2602 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 2603 | |
a1d8b49a | 2604 | wait_for_completion(&cmd->t_transport_stop_comp); |
c66ac9db | 2605 | |
a1d8b49a | 2606 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
7d680f3b | 2607 | cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP); |
c66ac9db | 2608 | |
649ee054 BVA |
2609 | pr_debug("wait_for_tasks: Stopped wait_for_completion(&cmd->t_transport_stop_comp) for ITT: 0x%08llx\n", |
2610 | cmd->tag); | |
c66ac9db | 2611 | |
d14921d6 | 2612 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
a17f091d NB |
2613 | |
2614 | return true; | |
c66ac9db | 2615 | } |
d14921d6 | 2616 | EXPORT_SYMBOL(transport_wait_for_tasks); |
c66ac9db | 2617 | |
76736db3 SG |
2618 | static |
2619 | void transport_err_sector_info(unsigned char *buffer, sector_t bad_sector) | |
2620 | { | |
2621 | /* Place failed LBA in sense data information descriptor 0. */ | |
2622 | buffer[SPC_ADD_SENSE_LEN_OFFSET] = 0xc; | |
2623 | buffer[SPC_DESC_TYPE_OFFSET] = 0; /* Information */ | |
2624 | buffer[SPC_ADDITIONAL_DESC_LEN_OFFSET] = 0xa; | |
2625 | buffer[SPC_VALIDITY_OFFSET] = 0x80; | |
2626 | ||
2627 | /* Descriptor Information: failing sector */ | |
2628 | put_unaligned_be64(bad_sector, &buffer[12]); | |
2629 | } | |
2630 | ||
ab78fef4 BVA |
2631 | struct sense_info { |
2632 | u8 key; | |
2633 | u8 asc; | |
2634 | u8 ascq; | |
2635 | bool add_sector_info; | |
2636 | }; | |
2637 | ||
2638 | static const struct sense_info sense_info_table[] = { | |
2639 | [TCM_NO_SENSE] = { | |
2640 | .key = NOT_READY | |
2641 | }, | |
2642 | [TCM_NON_EXISTENT_LUN] = { | |
2643 | .key = ILLEGAL_REQUEST, | |
2644 | .asc = 0x25 /* LOGICAL UNIT NOT SUPPORTED */ | |
2645 | }, | |
2646 | [TCM_UNSUPPORTED_SCSI_OPCODE] = { | |
2647 | .key = ILLEGAL_REQUEST, | |
2648 | .asc = 0x20, /* INVALID COMMAND OPERATION CODE */ | |
2649 | }, | |
2650 | [TCM_SECTOR_COUNT_TOO_MANY] = { | |
2651 | .key = ILLEGAL_REQUEST, | |
2652 | .asc = 0x20, /* INVALID COMMAND OPERATION CODE */ | |
2653 | }, | |
2654 | [TCM_UNKNOWN_MODE_PAGE] = { | |
2655 | .key = ILLEGAL_REQUEST, | |
2656 | .asc = 0x24, /* INVALID FIELD IN CDB */ | |
2657 | }, | |
2658 | [TCM_CHECK_CONDITION_ABORT_CMD] = { | |
2659 | .key = ABORTED_COMMAND, | |
2660 | .asc = 0x29, /* BUS DEVICE RESET FUNCTION OCCURRED */ | |
2661 | .ascq = 0x03, | |
2662 | }, | |
2663 | [TCM_INCORRECT_AMOUNT_OF_DATA] = { | |
2664 | .key = ABORTED_COMMAND, | |
2665 | .asc = 0x0c, /* WRITE ERROR */ | |
2666 | .ascq = 0x0d, /* NOT ENOUGH UNSOLICITED DATA */ | |
2667 | }, | |
2668 | [TCM_INVALID_CDB_FIELD] = { | |
2669 | .key = ILLEGAL_REQUEST, | |
2670 | .asc = 0x24, /* INVALID FIELD IN CDB */ | |
2671 | }, | |
2672 | [TCM_INVALID_PARAMETER_LIST] = { | |
2673 | .key = ILLEGAL_REQUEST, | |
2674 | .asc = 0x26, /* INVALID FIELD IN PARAMETER LIST */ | |
2675 | }, | |
2676 | [TCM_PARAMETER_LIST_LENGTH_ERROR] = { | |
2677 | .key = ILLEGAL_REQUEST, | |
2678 | .asc = 0x1a, /* PARAMETER LIST LENGTH ERROR */ | |
2679 | }, | |
2680 | [TCM_UNEXPECTED_UNSOLICITED_DATA] = { | |
2681 | .key = ILLEGAL_REQUEST, | |
2682 | .asc = 0x0c, /* WRITE ERROR */ | |
2683 | .ascq = 0x0c, /* UNEXPECTED_UNSOLICITED_DATA */ | |
2684 | }, | |
2685 | [TCM_SERVICE_CRC_ERROR] = { | |
2686 | .key = ABORTED_COMMAND, | |
2687 | .asc = 0x47, /* PROTOCOL SERVICE CRC ERROR */ | |
2688 | .ascq = 0x05, /* N/A */ | |
2689 | }, | |
2690 | [TCM_SNACK_REJECTED] = { | |
2691 | .key = ABORTED_COMMAND, | |
2692 | .asc = 0x11, /* READ ERROR */ | |
2693 | .ascq = 0x13, /* FAILED RETRANSMISSION REQUEST */ | |
2694 | }, | |
2695 | [TCM_WRITE_PROTECTED] = { | |
2696 | .key = DATA_PROTECT, | |
2697 | .asc = 0x27, /* WRITE PROTECTED */ | |
2698 | }, | |
2699 | [TCM_ADDRESS_OUT_OF_RANGE] = { | |
2700 | .key = ILLEGAL_REQUEST, | |
2701 | .asc = 0x21, /* LOGICAL BLOCK ADDRESS OUT OF RANGE */ | |
2702 | }, | |
2703 | [TCM_CHECK_CONDITION_UNIT_ATTENTION] = { | |
2704 | .key = UNIT_ATTENTION, | |
2705 | }, | |
2706 | [TCM_CHECK_CONDITION_NOT_READY] = { | |
2707 | .key = NOT_READY, | |
2708 | }, | |
2709 | [TCM_MISCOMPARE_VERIFY] = { | |
2710 | .key = MISCOMPARE, | |
2711 | .asc = 0x1d, /* MISCOMPARE DURING VERIFY OPERATION */ | |
2712 | .ascq = 0x00, | |
2713 | }, | |
2714 | [TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED] = { | |
2715 | .key = ILLEGAL_REQUEST, | |
2716 | .asc = 0x10, | |
2717 | .ascq = 0x01, /* LOGICAL BLOCK GUARD CHECK FAILED */ | |
2718 | .add_sector_info = true, | |
2719 | }, | |
2720 | [TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED] = { | |
2721 | .key = ILLEGAL_REQUEST, | |
2722 | .asc = 0x10, | |
2723 | .ascq = 0x02, /* LOGICAL BLOCK APPLICATION TAG CHECK FAILED */ | |
2724 | .add_sector_info = true, | |
2725 | }, | |
2726 | [TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED] = { | |
2727 | .key = ILLEGAL_REQUEST, | |
2728 | .asc = 0x10, | |
2729 | .ascq = 0x03, /* LOGICAL BLOCK REFERENCE TAG CHECK FAILED */ | |
2730 | .add_sector_info = true, | |
2731 | }, | |
2732 | [TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE] = { | |
2733 | /* | |
2734 | * Returning ILLEGAL REQUEST would cause immediate IO errors on | |
2735 | * Solaris initiators. Returning NOT READY instead means the | |
2736 | * operations will be retried a finite number of times and we | |
2737 | * can survive intermittent errors. | |
2738 | */ | |
2739 | .key = NOT_READY, | |
2740 | .asc = 0x08, /* LOGICAL UNIT COMMUNICATION FAILURE */ | |
2741 | }, | |
2742 | }; | |
2743 | ||
2744 | static void translate_sense_reason(struct se_cmd *cmd, sense_reason_t reason) | |
2745 | { | |
2746 | const struct sense_info *si; | |
2747 | u8 *buffer = cmd->sense_buffer; | |
2748 | int r = (__force int)reason; | |
2749 | u8 asc, ascq; | |
2750 | ||
2751 | if (r < ARRAY_SIZE(sense_info_table) && sense_info_table[r].key) | |
2752 | si = &sense_info_table[r]; | |
2753 | else | |
2754 | si = &sense_info_table[(__force int) | |
2755 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE]; | |
2756 | ||
2757 | buffer[SPC_SENSE_KEY_OFFSET] = si->key; | |
2758 | if (reason == TCM_CHECK_CONDITION_UNIT_ATTENTION) { | |
2759 | core_scsi3_ua_for_check_condition(cmd, &asc, &ascq); | |
2760 | WARN_ON_ONCE(asc == 0); | |
2761 | } else if (si->asc == 0) { | |
2762 | WARN_ON_ONCE(cmd->scsi_asc == 0); | |
2763 | asc = cmd->scsi_asc; | |
2764 | ascq = cmd->scsi_ascq; | |
2765 | } else { | |
2766 | asc = si->asc; | |
2767 | ascq = si->ascq; | |
2768 | } | |
2769 | buffer[SPC_ASC_KEY_OFFSET] = asc; | |
2770 | buffer[SPC_ASCQ_KEY_OFFSET] = ascq; | |
2771 | if (si->add_sector_info) | |
2772 | transport_err_sector_info(cmd->sense_buffer, cmd->bad_sector); | |
2773 | } | |
2774 | ||
de103c93 CH |
2775 | int |
2776 | transport_send_check_condition_and_sense(struct se_cmd *cmd, | |
2777 | sense_reason_t reason, int from_transport) | |
c66ac9db | 2778 | { |
c66ac9db | 2779 | unsigned long flags; |
c66ac9db | 2780 | |
a1d8b49a | 2781 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 2782 | if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) { |
a1d8b49a | 2783 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
2784 | return 0; |
2785 | } | |
2786 | cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION; | |
a1d8b49a | 2787 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 2788 | |
ab78fef4 | 2789 | if (!from_transport) { |
c66ac9db | 2790 | cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE; |
ab78fef4 BVA |
2791 | translate_sense_reason(cmd, reason); |
2792 | cmd->scsi_status = SAM_STAT_CHECK_CONDITION; | |
2793 | cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER; | |
c66ac9db | 2794 | } |
c66ac9db | 2795 | |
e5c0d6ad | 2796 | trace_target_cmd_complete(cmd); |
07bde79a | 2797 | return cmd->se_tfo->queue_status(cmd); |
c66ac9db NB |
2798 | } |
2799 | EXPORT_SYMBOL(transport_send_check_condition_and_sense); | |
2800 | ||
2801 | int transport_check_aborted_status(struct se_cmd *cmd, int send_status) | |
2802 | { | |
c18bc7d8 RD |
2803 | if (!(cmd->transport_state & CMD_T_ABORTED)) |
2804 | return 0; | |
c66ac9db | 2805 | |
68259b5a AL |
2806 | /* |
2807 | * If cmd has been aborted but either no status is to be sent or it has | |
2808 | * already been sent, just return | |
2809 | */ | |
2810 | if (!send_status || !(cmd->se_cmd_flags & SCF_SEND_DELAYED_TAS)) | |
c18bc7d8 | 2811 | return 1; |
8b1e1244 | 2812 | |
649ee054 BVA |
2813 | pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB: 0x%02x ITT: 0x%08llx\n", |
2814 | cmd->t_task_cdb[0], cmd->tag); | |
8b1e1244 | 2815 | |
68259b5a | 2816 | cmd->se_cmd_flags &= ~SCF_SEND_DELAYED_TAS; |
29f4c090 | 2817 | cmd->scsi_status = SAM_STAT_TASK_ABORTED; |
e5c0d6ad | 2818 | trace_target_cmd_complete(cmd); |
c18bc7d8 RD |
2819 | cmd->se_tfo->queue_status(cmd); |
2820 | ||
2821 | return 1; | |
c66ac9db NB |
2822 | } |
2823 | EXPORT_SYMBOL(transport_check_aborted_status); | |
2824 | ||
2825 | void transport_send_task_abort(struct se_cmd *cmd) | |
2826 | { | |
c252f003 NB |
2827 | unsigned long flags; |
2828 | ||
2829 | spin_lock_irqsave(&cmd->t_state_lock, flags); | |
68259b5a | 2830 | if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION)) { |
c252f003 NB |
2831 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
2832 | return; | |
2833 | } | |
2834 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
2835 | ||
c66ac9db NB |
2836 | /* |
2837 | * If there are still expected incoming fabric WRITEs, we wait | |
2838 | * until until they have completed before sending a TASK_ABORTED | |
2839 | * response. This response with TASK_ABORTED status will be | |
2840 | * queued back to fabric module by transport_check_aborted_status(). | |
2841 | */ | |
2842 | if (cmd->data_direction == DMA_TO_DEVICE) { | |
e3d6f909 | 2843 | if (cmd->se_tfo->write_pending_status(cmd) != 0) { |
7d680f3b | 2844 | cmd->transport_state |= CMD_T_ABORTED; |
68259b5a | 2845 | cmd->se_cmd_flags |= SCF_SEND_DELAYED_TAS; |
29f4c090 | 2846 | return; |
c66ac9db NB |
2847 | } |
2848 | } | |
2849 | cmd->scsi_status = SAM_STAT_TASK_ABORTED; | |
8b1e1244 | 2850 | |
72b59d6e RD |
2851 | transport_lun_remove_cmd(cmd); |
2852 | ||
649ee054 BVA |
2853 | pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x, ITT: 0x%08llx\n", |
2854 | cmd->t_task_cdb[0], cmd->tag); | |
8b1e1244 | 2855 | |
e5c0d6ad | 2856 | trace_target_cmd_complete(cmd); |
e3d6f909 | 2857 | cmd->se_tfo->queue_status(cmd); |
c66ac9db NB |
2858 | } |
2859 | ||
af877292 | 2860 | static void target_tmr_work(struct work_struct *work) |
c66ac9db | 2861 | { |
af877292 | 2862 | struct se_cmd *cmd = container_of(work, struct se_cmd, work); |
5951146d | 2863 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
2864 | struct se_tmr_req *tmr = cmd->se_tmr_req; |
2865 | int ret; | |
2866 | ||
2867 | switch (tmr->function) { | |
5c6cd613 | 2868 | case TMR_ABORT_TASK: |
3d28934a | 2869 | core_tmr_abort_task(dev, tmr, cmd->se_sess); |
c66ac9db | 2870 | break; |
5c6cd613 NB |
2871 | case TMR_ABORT_TASK_SET: |
2872 | case TMR_CLEAR_ACA: | |
2873 | case TMR_CLEAR_TASK_SET: | |
c66ac9db NB |
2874 | tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED; |
2875 | break; | |
5c6cd613 | 2876 | case TMR_LUN_RESET: |
c66ac9db NB |
2877 | ret = core_tmr_lun_reset(dev, tmr, NULL, NULL); |
2878 | tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE : | |
2879 | TMR_FUNCTION_REJECTED; | |
b5aafb16 HR |
2880 | if (tmr->response == TMR_FUNCTION_COMPLETE) { |
2881 | target_ua_allocate_lun(cmd->se_sess->se_node_acl, | |
2882 | cmd->orig_fe_lun, 0x29, | |
2883 | ASCQ_29H_BUS_DEVICE_RESET_FUNCTION_OCCURRED); | |
2884 | } | |
c66ac9db | 2885 | break; |
5c6cd613 | 2886 | case TMR_TARGET_WARM_RESET: |
c66ac9db NB |
2887 | tmr->response = TMR_FUNCTION_REJECTED; |
2888 | break; | |
5c6cd613 | 2889 | case TMR_TARGET_COLD_RESET: |
c66ac9db NB |
2890 | tmr->response = TMR_FUNCTION_REJECTED; |
2891 | break; | |
c66ac9db | 2892 | default: |
6708bb27 | 2893 | pr_err("Uknown TMR function: 0x%02x.\n", |
c66ac9db NB |
2894 | tmr->function); |
2895 | tmr->response = TMR_FUNCTION_REJECTED; | |
2896 | break; | |
2897 | } | |
2898 | ||
2899 | cmd->t_state = TRANSPORT_ISTATE_PROCESSING; | |
e3d6f909 | 2900 | cmd->se_tfo->queue_tm_rsp(cmd); |
c66ac9db | 2901 | |
b7b8bef7 | 2902 | transport_cmd_check_stop_to_fabric(cmd); |
c66ac9db NB |
2903 | } |
2904 | ||
af877292 CH |
2905 | int transport_generic_handle_tmr( |
2906 | struct se_cmd *cmd) | |
c66ac9db | 2907 | { |
f15e9cd9 NB |
2908 | unsigned long flags; |
2909 | ||
2910 | spin_lock_irqsave(&cmd->t_state_lock, flags); | |
2911 | cmd->transport_state |= CMD_T_ACTIVE; | |
2912 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
2913 | ||
af877292 CH |
2914 | INIT_WORK(&cmd->work, target_tmr_work); |
2915 | queue_work(cmd->se_dev->tmr_wq, &cmd->work); | |
c66ac9db NB |
2916 | return 0; |
2917 | } | |
af877292 | 2918 | EXPORT_SYMBOL(transport_generic_handle_tmr); |
814e5b45 CH |
2919 | |
2920 | bool | |
2921 | target_check_wce(struct se_device *dev) | |
2922 | { | |
2923 | bool wce = false; | |
2924 | ||
2925 | if (dev->transport->get_write_cache) | |
2926 | wce = dev->transport->get_write_cache(dev); | |
2927 | else if (dev->dev_attrib.emulate_write_cache > 0) | |
2928 | wce = true; | |
2929 | ||
2930 | return wce; | |
2931 | } | |
2932 | ||
2933 | bool | |
2934 | target_check_fua(struct se_device *dev) | |
2935 | { | |
2936 | return target_check_wce(dev) && dev->dev_attrib.emulate_fua_write > 0; | |
2937 | } |