Commit | Line | Data |
---|---|---|
c66ac9db NB |
1 | /******************************************************************************* |
2 | * Filename: target_core_transport.c | |
3 | * | |
4 | * This file contains the Generic Target Engine Core. | |
5 | * | |
4c76251e | 6 | * (c) Copyright 2002-2013 Datera, Inc. |
c66ac9db NB |
7 | * |
8 | * Nicholas A. Bellinger <nab@kernel.org> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
23 | * | |
24 | ******************************************************************************/ | |
25 | ||
c66ac9db NB |
26 | #include <linux/net.h> |
27 | #include <linux/delay.h> | |
28 | #include <linux/string.h> | |
29 | #include <linux/timer.h> | |
30 | #include <linux/slab.h> | |
c66ac9db | 31 | #include <linux/spinlock.h> |
c66ac9db NB |
32 | #include <linux/kthread.h> |
33 | #include <linux/in.h> | |
34 | #include <linux/cdrom.h> | |
827509e3 | 35 | #include <linux/module.h> |
015487b8 | 36 | #include <linux/ratelimit.h> |
5538d294 | 37 | #include <linux/vmalloc.h> |
c66ac9db NB |
38 | #include <asm/unaligned.h> |
39 | #include <net/sock.h> | |
40 | #include <net/tcp.h> | |
ba929992 | 41 | #include <scsi/scsi_proto.h> |
9ec1e1ce | 42 | #include <scsi/scsi_common.h> |
c66ac9db NB |
43 | |
44 | #include <target/target_core_base.h> | |
c4795fb2 CH |
45 | #include <target/target_core_backend.h> |
46 | #include <target/target_core_fabric.h> | |
c66ac9db | 47 | |
e26d99ae | 48 | #include "target_core_internal.h" |
c66ac9db | 49 | #include "target_core_alua.h" |
c66ac9db | 50 | #include "target_core_pr.h" |
c66ac9db NB |
51 | #include "target_core_ua.h" |
52 | ||
e5c0d6ad RD |
53 | #define CREATE_TRACE_POINTS |
54 | #include <trace/events/target.h> | |
55 | ||
35e0e757 | 56 | static struct workqueue_struct *target_completion_wq; |
c66ac9db | 57 | static struct kmem_cache *se_sess_cache; |
c66ac9db | 58 | struct kmem_cache *se_ua_cache; |
c66ac9db NB |
59 | struct kmem_cache *t10_pr_reg_cache; |
60 | struct kmem_cache *t10_alua_lu_gp_cache; | |
61 | struct kmem_cache *t10_alua_lu_gp_mem_cache; | |
62 | struct kmem_cache *t10_alua_tg_pt_gp_cache; | |
229d4f11 HR |
63 | struct kmem_cache *t10_alua_lba_map_cache; |
64 | struct kmem_cache *t10_alua_lba_map_mem_cache; | |
c66ac9db | 65 | |
c66ac9db | 66 | static void transport_complete_task_attr(struct se_cmd *cmd); |
17e391dd | 67 | static void translate_sense_reason(struct se_cmd *cmd, sense_reason_t reason); |
07bde79a | 68 | static void transport_handle_queue_full(struct se_cmd *cmd, |
fa7e25cf | 69 | struct se_device *dev, int err, bool write_pending); |
35e0e757 | 70 | static void target_complete_ok_work(struct work_struct *work); |
c66ac9db | 71 | |
e3d6f909 | 72 | int init_se_kmem_caches(void) |
c66ac9db | 73 | { |
c66ac9db NB |
74 | se_sess_cache = kmem_cache_create("se_sess_cache", |
75 | sizeof(struct se_session), __alignof__(struct se_session), | |
76 | 0, NULL); | |
6708bb27 AG |
77 | if (!se_sess_cache) { |
78 | pr_err("kmem_cache_create() for struct se_session" | |
c66ac9db | 79 | " failed\n"); |
c8e31f26 | 80 | goto out; |
c66ac9db NB |
81 | } |
82 | se_ua_cache = kmem_cache_create("se_ua_cache", | |
83 | sizeof(struct se_ua), __alignof__(struct se_ua), | |
84 | 0, NULL); | |
6708bb27 AG |
85 | if (!se_ua_cache) { |
86 | pr_err("kmem_cache_create() for struct se_ua failed\n"); | |
35e0e757 | 87 | goto out_free_sess_cache; |
c66ac9db | 88 | } |
c66ac9db NB |
89 | t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache", |
90 | sizeof(struct t10_pr_registration), | |
91 | __alignof__(struct t10_pr_registration), 0, NULL); | |
6708bb27 AG |
92 | if (!t10_pr_reg_cache) { |
93 | pr_err("kmem_cache_create() for struct t10_pr_registration" | |
c66ac9db | 94 | " failed\n"); |
35e0e757 | 95 | goto out_free_ua_cache; |
c66ac9db NB |
96 | } |
97 | t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache", | |
98 | sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp), | |
99 | 0, NULL); | |
6708bb27 AG |
100 | if (!t10_alua_lu_gp_cache) { |
101 | pr_err("kmem_cache_create() for t10_alua_lu_gp_cache" | |
c66ac9db | 102 | " failed\n"); |
35e0e757 | 103 | goto out_free_pr_reg_cache; |
c66ac9db NB |
104 | } |
105 | t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache", | |
106 | sizeof(struct t10_alua_lu_gp_member), | |
107 | __alignof__(struct t10_alua_lu_gp_member), 0, NULL); | |
6708bb27 AG |
108 | if (!t10_alua_lu_gp_mem_cache) { |
109 | pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_" | |
c66ac9db | 110 | "cache failed\n"); |
35e0e757 | 111 | goto out_free_lu_gp_cache; |
c66ac9db NB |
112 | } |
113 | t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache", | |
114 | sizeof(struct t10_alua_tg_pt_gp), | |
115 | __alignof__(struct t10_alua_tg_pt_gp), 0, NULL); | |
6708bb27 AG |
116 | if (!t10_alua_tg_pt_gp_cache) { |
117 | pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_" | |
c66ac9db | 118 | "cache failed\n"); |
35e0e757 | 119 | goto out_free_lu_gp_mem_cache; |
c66ac9db | 120 | } |
229d4f11 HR |
121 | t10_alua_lba_map_cache = kmem_cache_create( |
122 | "t10_alua_lba_map_cache", | |
123 | sizeof(struct t10_alua_lba_map), | |
124 | __alignof__(struct t10_alua_lba_map), 0, NULL); | |
125 | if (!t10_alua_lba_map_cache) { | |
126 | pr_err("kmem_cache_create() for t10_alua_lba_map_" | |
127 | "cache failed\n"); | |
adf653f9 | 128 | goto out_free_tg_pt_gp_cache; |
229d4f11 HR |
129 | } |
130 | t10_alua_lba_map_mem_cache = kmem_cache_create( | |
131 | "t10_alua_lba_map_mem_cache", | |
132 | sizeof(struct t10_alua_lba_map_member), | |
133 | __alignof__(struct t10_alua_lba_map_member), 0, NULL); | |
134 | if (!t10_alua_lba_map_mem_cache) { | |
135 | pr_err("kmem_cache_create() for t10_alua_lba_map_mem_" | |
136 | "cache failed\n"); | |
137 | goto out_free_lba_map_cache; | |
138 | } | |
c66ac9db | 139 | |
35e0e757 CH |
140 | target_completion_wq = alloc_workqueue("target_completion", |
141 | WQ_MEM_RECLAIM, 0); | |
142 | if (!target_completion_wq) | |
229d4f11 | 143 | goto out_free_lba_map_mem_cache; |
35e0e757 | 144 | |
c66ac9db | 145 | return 0; |
35e0e757 | 146 | |
229d4f11 HR |
147 | out_free_lba_map_mem_cache: |
148 | kmem_cache_destroy(t10_alua_lba_map_mem_cache); | |
149 | out_free_lba_map_cache: | |
150 | kmem_cache_destroy(t10_alua_lba_map_cache); | |
35e0e757 CH |
151 | out_free_tg_pt_gp_cache: |
152 | kmem_cache_destroy(t10_alua_tg_pt_gp_cache); | |
153 | out_free_lu_gp_mem_cache: | |
154 | kmem_cache_destroy(t10_alua_lu_gp_mem_cache); | |
155 | out_free_lu_gp_cache: | |
156 | kmem_cache_destroy(t10_alua_lu_gp_cache); | |
157 | out_free_pr_reg_cache: | |
158 | kmem_cache_destroy(t10_pr_reg_cache); | |
159 | out_free_ua_cache: | |
160 | kmem_cache_destroy(se_ua_cache); | |
161 | out_free_sess_cache: | |
162 | kmem_cache_destroy(se_sess_cache); | |
c66ac9db | 163 | out: |
e3d6f909 | 164 | return -ENOMEM; |
c66ac9db NB |
165 | } |
166 | ||
e3d6f909 | 167 | void release_se_kmem_caches(void) |
c66ac9db | 168 | { |
35e0e757 | 169 | destroy_workqueue(target_completion_wq); |
c66ac9db NB |
170 | kmem_cache_destroy(se_sess_cache); |
171 | kmem_cache_destroy(se_ua_cache); | |
c66ac9db NB |
172 | kmem_cache_destroy(t10_pr_reg_cache); |
173 | kmem_cache_destroy(t10_alua_lu_gp_cache); | |
174 | kmem_cache_destroy(t10_alua_lu_gp_mem_cache); | |
175 | kmem_cache_destroy(t10_alua_tg_pt_gp_cache); | |
229d4f11 HR |
176 | kmem_cache_destroy(t10_alua_lba_map_cache); |
177 | kmem_cache_destroy(t10_alua_lba_map_mem_cache); | |
c66ac9db NB |
178 | } |
179 | ||
e3d6f909 AG |
180 | /* This code ensures unique mib indexes are handed out. */ |
181 | static DEFINE_SPINLOCK(scsi_mib_index_lock); | |
182 | static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX]; | |
e89d15ee NB |
183 | |
184 | /* | |
185 | * Allocate a new row index for the entry type specified | |
186 | */ | |
187 | u32 scsi_get_new_index(scsi_index_t type) | |
188 | { | |
189 | u32 new_index; | |
190 | ||
e3d6f909 | 191 | BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX)); |
e89d15ee | 192 | |
e3d6f909 AG |
193 | spin_lock(&scsi_mib_index_lock); |
194 | new_index = ++scsi_mib_index[type]; | |
195 | spin_unlock(&scsi_mib_index_lock); | |
e89d15ee NB |
196 | |
197 | return new_index; | |
198 | } | |
199 | ||
dbc5623e | 200 | void transport_subsystem_check_init(void) |
c66ac9db NB |
201 | { |
202 | int ret; | |
283669d2 | 203 | static int sub_api_initialized; |
c66ac9db | 204 | |
dbc5623e NB |
205 | if (sub_api_initialized) |
206 | return; | |
207 | ||
6110f37f | 208 | ret = IS_ENABLED(CONFIG_TCM_IBLOCK) && request_module("target_core_iblock"); |
c66ac9db | 209 | if (ret != 0) |
6708bb27 | 210 | pr_err("Unable to load target_core_iblock\n"); |
c66ac9db | 211 | |
6110f37f | 212 | ret = IS_ENABLED(CONFIG_TCM_FILEIO) && request_module("target_core_file"); |
c66ac9db | 213 | if (ret != 0) |
6708bb27 | 214 | pr_err("Unable to load target_core_file\n"); |
c66ac9db | 215 | |
6110f37f | 216 | ret = IS_ENABLED(CONFIG_TCM_PSCSI) && request_module("target_core_pscsi"); |
c66ac9db | 217 | if (ret != 0) |
6708bb27 | 218 | pr_err("Unable to load target_core_pscsi\n"); |
c66ac9db | 219 | |
6110f37f | 220 | ret = IS_ENABLED(CONFIG_TCM_USER2) && request_module("target_core_user"); |
7c9e7a6f AG |
221 | if (ret != 0) |
222 | pr_err("Unable to load target_core_user\n"); | |
223 | ||
e3d6f909 | 224 | sub_api_initialized = 1; |
c66ac9db NB |
225 | } |
226 | ||
ad669505 BVA |
227 | static void target_release_sess_cmd_refcnt(struct percpu_ref *ref) |
228 | { | |
229 | struct se_session *sess = container_of(ref, typeof(*sess), cmd_count); | |
230 | ||
231 | wake_up(&sess->cmd_list_wq); | |
232 | } | |
233 | ||
d1bff07f BVA |
234 | /** |
235 | * transport_init_session - initialize a session object | |
236 | * @se_sess: Session object pointer. | |
237 | * | |
238 | * The caller must have zero-initialized @se_sess before calling this function. | |
239 | */ | |
ad669505 | 240 | int transport_init_session(struct se_session *se_sess) |
d1bff07f BVA |
241 | { |
242 | INIT_LIST_HEAD(&se_sess->sess_list); | |
243 | INIT_LIST_HEAD(&se_sess->sess_acl_list); | |
244 | INIT_LIST_HEAD(&se_sess->sess_cmd_list); | |
d1bff07f | 245 | spin_lock_init(&se_sess->sess_cmd_lock); |
00d909a1 | 246 | init_waitqueue_head(&se_sess->cmd_list_wq); |
ad669505 BVA |
247 | return percpu_ref_init(&se_sess->cmd_count, |
248 | target_release_sess_cmd_refcnt, 0, GFP_KERNEL); | |
d1bff07f BVA |
249 | } |
250 | EXPORT_SYMBOL(transport_init_session); | |
251 | ||
317f8971 BVA |
252 | /** |
253 | * transport_alloc_session - allocate a session object and initialize it | |
254 | * @sup_prot_ops: bitmask that defines which T10-PI modes are supported. | |
255 | */ | |
256 | struct se_session *transport_alloc_session(enum target_prot_op sup_prot_ops) | |
c66ac9db NB |
257 | { |
258 | struct se_session *se_sess; | |
ad669505 | 259 | int ret; |
c66ac9db NB |
260 | |
261 | se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL); | |
6708bb27 AG |
262 | if (!se_sess) { |
263 | pr_err("Unable to allocate struct se_session from" | |
c66ac9db NB |
264 | " se_sess_cache\n"); |
265 | return ERR_PTR(-ENOMEM); | |
266 | } | |
ad669505 BVA |
267 | ret = transport_init_session(se_sess); |
268 | if (ret < 0) { | |
8b2db98e | 269 | kmem_cache_free(se_sess_cache, se_sess); |
ad669505 BVA |
270 | return ERR_PTR(ret); |
271 | } | |
e70beee7 | 272 | se_sess->sup_prot_ops = sup_prot_ops; |
c66ac9db NB |
273 | |
274 | return se_sess; | |
275 | } | |
317f8971 BVA |
276 | EXPORT_SYMBOL(transport_alloc_session); |
277 | ||
278 | /** | |
279 | * transport_alloc_session_tags - allocate target driver private data | |
280 | * @se_sess: Session pointer. | |
281 | * @tag_num: Maximum number of in-flight commands between initiator and target. | |
282 | * @tag_size: Size in bytes of the private data a target driver associates with | |
283 | * each command. | |
284 | */ | |
c0add7fd NB |
285 | int transport_alloc_session_tags(struct se_session *se_sess, |
286 | unsigned int tag_num, unsigned int tag_size) | |
287 | { | |
288 | int rc; | |
289 | ||
5d6cd9fe BVA |
290 | se_sess->sess_cmd_map = kvcalloc(tag_size, tag_num, |
291 | GFP_KERNEL | __GFP_RETRY_MAYFAIL); | |
c0add7fd | 292 | if (!se_sess->sess_cmd_map) { |
5d6cd9fe BVA |
293 | pr_err("Unable to allocate se_sess->sess_cmd_map\n"); |
294 | return -ENOMEM; | |
c0add7fd NB |
295 | } |
296 | ||
10e9cbb6 MW |
297 | rc = sbitmap_queue_init_node(&se_sess->sess_tag_pool, tag_num, -1, |
298 | false, GFP_KERNEL, NUMA_NO_NODE); | |
c0add7fd NB |
299 | if (rc < 0) { |
300 | pr_err("Unable to init se_sess->sess_tag_pool," | |
301 | " tag_num: %u\n", tag_num); | |
de64d3a6 | 302 | kvfree(se_sess->sess_cmd_map); |
c0add7fd NB |
303 | se_sess->sess_cmd_map = NULL; |
304 | return -ENOMEM; | |
305 | } | |
306 | ||
307 | return 0; | |
308 | } | |
309 | EXPORT_SYMBOL(transport_alloc_session_tags); | |
310 | ||
317f8971 BVA |
311 | /** |
312 | * transport_init_session_tags - allocate a session and target driver private data | |
313 | * @tag_num: Maximum number of in-flight commands between initiator and target. | |
314 | * @tag_size: Size in bytes of the private data a target driver associates with | |
315 | * each command. | |
316 | * @sup_prot_ops: bitmask that defines which T10-PI modes are supported. | |
317 | */ | |
3cd14285 MC |
318 | static struct se_session * |
319 | transport_init_session_tags(unsigned int tag_num, unsigned int tag_size, | |
320 | enum target_prot_op sup_prot_ops) | |
c0add7fd NB |
321 | { |
322 | struct se_session *se_sess; | |
323 | int rc; | |
324 | ||
7861728d NB |
325 | if (tag_num != 0 && !tag_size) { |
326 | pr_err("init_session_tags called with percpu-ida tag_num:" | |
327 | " %u, but zero tag_size\n", tag_num); | |
328 | return ERR_PTR(-EINVAL); | |
329 | } | |
330 | if (!tag_num && tag_size) { | |
331 | pr_err("init_session_tags called with percpu-ida tag_size:" | |
332 | " %u, but zero tag_num\n", tag_size); | |
333 | return ERR_PTR(-EINVAL); | |
334 | } | |
335 | ||
317f8971 | 336 | se_sess = transport_alloc_session(sup_prot_ops); |
c0add7fd NB |
337 | if (IS_ERR(se_sess)) |
338 | return se_sess; | |
339 | ||
340 | rc = transport_alloc_session_tags(se_sess, tag_num, tag_size); | |
341 | if (rc < 0) { | |
342 | transport_free_session(se_sess); | |
343 | return ERR_PTR(-ENOMEM); | |
344 | } | |
345 | ||
346 | return se_sess; | |
347 | } | |
c0add7fd | 348 | |
c66ac9db | 349 | /* |
140854cb | 350 | * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called. |
c66ac9db NB |
351 | */ |
352 | void __transport_register_session( | |
353 | struct se_portal_group *se_tpg, | |
354 | struct se_node_acl *se_nacl, | |
355 | struct se_session *se_sess, | |
356 | void *fabric_sess_ptr) | |
357 | { | |
9ac8928e | 358 | const struct target_core_fabric_ops *tfo = se_tpg->se_tpg_tfo; |
c66ac9db | 359 | unsigned char buf[PR_REG_ISID_LEN]; |
6a64f6e1 | 360 | unsigned long flags; |
c66ac9db NB |
361 | |
362 | se_sess->se_tpg = se_tpg; | |
363 | se_sess->fabric_sess_ptr = fabric_sess_ptr; | |
364 | /* | |
365 | * Used by struct se_node_acl's under ConfigFS to locate active se_session-t | |
366 | * | |
367 | * Only set for struct se_session's that will actually be moving I/O. | |
368 | * eg: *NOT* discovery sessions. | |
369 | */ | |
370 | if (se_nacl) { | |
bffb5128 NB |
371 | /* |
372 | * | |
373 | * Determine if fabric allows for T10-PI feature bits exposed to | |
374 | * initiators for device backends with !dev->dev_attrib.pi_prot_type. | |
375 | * | |
376 | * If so, then always save prot_type on a per se_node_acl node | |
377 | * basis and re-instate the previous sess_prot_type to avoid | |
378 | * disabling PI from below any previously initiator side | |
379 | * registered LUNs. | |
380 | */ | |
381 | if (se_nacl->saved_prot_type) | |
382 | se_sess->sess_prot_type = se_nacl->saved_prot_type; | |
383 | else if (tfo->tpg_check_prot_fabric_only) | |
384 | se_sess->sess_prot_type = se_nacl->saved_prot_type = | |
385 | tfo->tpg_check_prot_fabric_only(se_tpg); | |
c66ac9db NB |
386 | /* |
387 | * If the fabric module supports an ISID based TransportID, | |
388 | * save this value in binary from the fabric I_T Nexus now. | |
389 | */ | |
e3d6f909 | 390 | if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { |
c66ac9db | 391 | memset(&buf[0], 0, PR_REG_ISID_LEN); |
e3d6f909 | 392 | se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, |
c66ac9db NB |
393 | &buf[0], PR_REG_ISID_LEN); |
394 | se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]); | |
395 | } | |
afb999ff | 396 | |
6a64f6e1 | 397 | spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags); |
c66ac9db NB |
398 | /* |
399 | * The se_nacl->nacl_sess pointer will be set to the | |
400 | * last active I_T Nexus for each struct se_node_acl. | |
401 | */ | |
402 | se_nacl->nacl_sess = se_sess; | |
403 | ||
404 | list_add_tail(&se_sess->sess_acl_list, | |
405 | &se_nacl->acl_sess_list); | |
6a64f6e1 | 406 | spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags); |
c66ac9db NB |
407 | } |
408 | list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list); | |
409 | ||
6708bb27 | 410 | pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n", |
30c7ca93 | 411 | se_tpg->se_tpg_tfo->fabric_name, se_sess->fabric_sess_ptr); |
c66ac9db NB |
412 | } |
413 | EXPORT_SYMBOL(__transport_register_session); | |
414 | ||
415 | void transport_register_session( | |
416 | struct se_portal_group *se_tpg, | |
417 | struct se_node_acl *se_nacl, | |
418 | struct se_session *se_sess, | |
419 | void *fabric_sess_ptr) | |
420 | { | |
140854cb NB |
421 | unsigned long flags; |
422 | ||
423 | spin_lock_irqsave(&se_tpg->session_lock, flags); | |
c66ac9db | 424 | __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr); |
140854cb | 425 | spin_unlock_irqrestore(&se_tpg->session_lock, flags); |
c66ac9db NB |
426 | } |
427 | EXPORT_SYMBOL(transport_register_session); | |
428 | ||
7861728d | 429 | struct se_session * |
fa834287 | 430 | target_setup_session(struct se_portal_group *tpg, |
7861728d NB |
431 | unsigned int tag_num, unsigned int tag_size, |
432 | enum target_prot_op prot_op, | |
433 | const char *initiatorname, void *private, | |
434 | int (*callback)(struct se_portal_group *, | |
435 | struct se_session *, void *)) | |
436 | { | |
437 | struct se_session *sess; | |
438 | ||
439 | /* | |
440 | * If the fabric driver is using percpu-ida based pre allocation | |
441 | * of I/O descriptor tags, go ahead and perform that setup now.. | |
442 | */ | |
443 | if (tag_num != 0) | |
444 | sess = transport_init_session_tags(tag_num, tag_size, prot_op); | |
445 | else | |
317f8971 | 446 | sess = transport_alloc_session(prot_op); |
7861728d NB |
447 | |
448 | if (IS_ERR(sess)) | |
449 | return sess; | |
450 | ||
451 | sess->se_node_acl = core_tpg_check_initiator_node_acl(tpg, | |
452 | (unsigned char *)initiatorname); | |
453 | if (!sess->se_node_acl) { | |
454 | transport_free_session(sess); | |
455 | return ERR_PTR(-EACCES); | |
456 | } | |
457 | /* | |
458 | * Go ahead and perform any remaining fabric setup that is | |
459 | * required before transport_register_session(). | |
460 | */ | |
461 | if (callback != NULL) { | |
462 | int rc = callback(tpg, sess, private); | |
463 | if (rc) { | |
464 | transport_free_session(sess); | |
465 | return ERR_PTR(rc); | |
466 | } | |
467 | } | |
468 | ||
469 | transport_register_session(tpg, sess->se_node_acl, sess, private); | |
470 | return sess; | |
471 | } | |
fa834287 | 472 | EXPORT_SYMBOL(target_setup_session); |
7861728d | 473 | |
f8e471f9 NB |
474 | ssize_t target_show_dynamic_sessions(struct se_portal_group *se_tpg, char *page) |
475 | { | |
476 | struct se_session *se_sess; | |
477 | ssize_t len = 0; | |
478 | ||
479 | spin_lock_bh(&se_tpg->session_lock); | |
480 | list_for_each_entry(se_sess, &se_tpg->tpg_sess_list, sess_list) { | |
481 | if (!se_sess->se_node_acl) | |
482 | continue; | |
483 | if (!se_sess->se_node_acl->dynamic_node_acl) | |
484 | continue; | |
485 | if (strlen(se_sess->se_node_acl->initiatorname) + 1 + len > PAGE_SIZE) | |
486 | break; | |
487 | ||
488 | len += snprintf(page + len, PAGE_SIZE - len, "%s\n", | |
489 | se_sess->se_node_acl->initiatorname); | |
490 | len += 1; /* Include NULL terminator */ | |
491 | } | |
492 | spin_unlock_bh(&se_tpg->session_lock); | |
493 | ||
494 | return len; | |
495 | } | |
496 | EXPORT_SYMBOL(target_show_dynamic_sessions); | |
497 | ||
afb999ff NB |
498 | static void target_complete_nacl(struct kref *kref) |
499 | { | |
500 | struct se_node_acl *nacl = container_of(kref, | |
501 | struct se_node_acl, acl_kref); | |
01d4d673 | 502 | struct se_portal_group *se_tpg = nacl->se_tpg; |
afb999ff | 503 | |
01d4d673 NB |
504 | if (!nacl->dynamic_stop) { |
505 | complete(&nacl->acl_free_comp); | |
506 | return; | |
507 | } | |
508 | ||
509 | mutex_lock(&se_tpg->acl_node_mutex); | |
6f48655f | 510 | list_del_init(&nacl->acl_list); |
01d4d673 NB |
511 | mutex_unlock(&se_tpg->acl_node_mutex); |
512 | ||
513 | core_tpg_wait_for_nacl_pr_ref(nacl); | |
514 | core_free_device_list_for_node(nacl, se_tpg); | |
515 | kfree(nacl); | |
afb999ff NB |
516 | } |
517 | ||
518 | void target_put_nacl(struct se_node_acl *nacl) | |
519 | { | |
520 | kref_put(&nacl->acl_kref, target_complete_nacl); | |
521 | } | |
21aaa23b | 522 | EXPORT_SYMBOL(target_put_nacl); |
afb999ff | 523 | |
c66ac9db NB |
524 | void transport_deregister_session_configfs(struct se_session *se_sess) |
525 | { | |
526 | struct se_node_acl *se_nacl; | |
23388864 | 527 | unsigned long flags; |
c66ac9db NB |
528 | /* |
529 | * Used by struct se_node_acl's under ConfigFS to locate active struct se_session | |
530 | */ | |
531 | se_nacl = se_sess->se_node_acl; | |
6708bb27 | 532 | if (se_nacl) { |
23388864 | 533 | spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags); |
fba81f88 CH |
534 | if (!list_empty(&se_sess->sess_acl_list)) |
535 | list_del_init(&se_sess->sess_acl_list); | |
c66ac9db NB |
536 | /* |
537 | * If the session list is empty, then clear the pointer. | |
538 | * Otherwise, set the struct se_session pointer from the tail | |
539 | * element of the per struct se_node_acl active session list. | |
540 | */ | |
541 | if (list_empty(&se_nacl->acl_sess_list)) | |
542 | se_nacl->nacl_sess = NULL; | |
543 | else { | |
544 | se_nacl->nacl_sess = container_of( | |
545 | se_nacl->acl_sess_list.prev, | |
546 | struct se_session, sess_acl_list); | |
547 | } | |
23388864 | 548 | spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags); |
c66ac9db NB |
549 | } |
550 | } | |
551 | EXPORT_SYMBOL(transport_deregister_session_configfs); | |
552 | ||
553 | void transport_free_session(struct se_session *se_sess) | |
554 | { | |
21aaa23b | 555 | struct se_node_acl *se_nacl = se_sess->se_node_acl; |
01d4d673 | 556 | |
21aaa23b NB |
557 | /* |
558 | * Drop the se_node_acl->nacl_kref obtained from within | |
559 | * core_tpg_get_initiator_node_acl(). | |
560 | */ | |
561 | if (se_nacl) { | |
01d4d673 NB |
562 | struct se_portal_group *se_tpg = se_nacl->se_tpg; |
563 | const struct target_core_fabric_ops *se_tfo = se_tpg->se_tpg_tfo; | |
564 | unsigned long flags; | |
565 | ||
21aaa23b | 566 | se_sess->se_node_acl = NULL; |
01d4d673 NB |
567 | |
568 | /* | |
569 | * Also determine if we need to drop the extra ->cmd_kref if | |
570 | * it had been previously dynamically generated, and | |
571 | * the endpoint is not caching dynamic ACLs. | |
572 | */ | |
573 | mutex_lock(&se_tpg->acl_node_mutex); | |
574 | if (se_nacl->dynamic_node_acl && | |
575 | !se_tfo->tpg_check_demo_mode_cache(se_tpg)) { | |
576 | spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags); | |
577 | if (list_empty(&se_nacl->acl_sess_list)) | |
578 | se_nacl->dynamic_stop = true; | |
579 | spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags); | |
580 | ||
581 | if (se_nacl->dynamic_stop) | |
6f48655f | 582 | list_del_init(&se_nacl->acl_list); |
01d4d673 NB |
583 | } |
584 | mutex_unlock(&se_tpg->acl_node_mutex); | |
585 | ||
586 | if (se_nacl->dynamic_stop) | |
587 | target_put_nacl(se_nacl); | |
588 | ||
21aaa23b NB |
589 | target_put_nacl(se_nacl); |
590 | } | |
c0add7fd | 591 | if (se_sess->sess_cmd_map) { |
10e9cbb6 | 592 | sbitmap_queue_free(&se_sess->sess_tag_pool); |
de64d3a6 | 593 | kvfree(se_sess->sess_cmd_map); |
c0add7fd | 594 | } |
ad669505 | 595 | percpu_ref_exit(&se_sess->cmd_count); |
c66ac9db NB |
596 | kmem_cache_free(se_sess_cache, se_sess); |
597 | } | |
598 | EXPORT_SYMBOL(transport_free_session); | |
599 | ||
600 | void transport_deregister_session(struct se_session *se_sess) | |
601 | { | |
602 | struct se_portal_group *se_tpg = se_sess->se_tpg; | |
e63a8e19 | 603 | unsigned long flags; |
c66ac9db | 604 | |
6708bb27 | 605 | if (!se_tpg) { |
c66ac9db NB |
606 | transport_free_session(se_sess); |
607 | return; | |
608 | } | |
c66ac9db | 609 | |
e63a8e19 | 610 | spin_lock_irqsave(&se_tpg->session_lock, flags); |
c66ac9db NB |
611 | list_del(&se_sess->sess_list); |
612 | se_sess->se_tpg = NULL; | |
613 | se_sess->fabric_sess_ptr = NULL; | |
e63a8e19 | 614 | spin_unlock_irqrestore(&se_tpg->session_lock, flags); |
c66ac9db | 615 | |
6708bb27 | 616 | pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n", |
30c7ca93 | 617 | se_tpg->se_tpg_tfo->fabric_name); |
01468346 | 618 | /* |
125d0119 | 619 | * If last kref is dropping now for an explicit NodeACL, awake sleeping |
afb999ff | 620 | * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group |
21aaa23b | 621 | * removal context from within transport_free_session() code. |
01d4d673 NB |
622 | * |
623 | * For dynamic ACL, target_put_nacl() uses target_complete_nacl() | |
624 | * to release all remaining generate_node_acl=1 created ACL resources. | |
01468346 | 625 | */ |
01468346 | 626 | |
afb999ff | 627 | transport_free_session(se_sess); |
c66ac9db NB |
628 | } |
629 | EXPORT_SYMBOL(transport_deregister_session); | |
630 | ||
fb7c70f2 MC |
631 | void target_remove_session(struct se_session *se_sess) |
632 | { | |
633 | transport_deregister_session_configfs(se_sess); | |
634 | transport_deregister_session(se_sess); | |
635 | } | |
636 | EXPORT_SYMBOL(target_remove_session); | |
637 | ||
cf572a96 | 638 | static void target_remove_from_state_list(struct se_cmd *cmd) |
c66ac9db | 639 | { |
42bf829e | 640 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
641 | unsigned long flags; |
642 | ||
42bf829e CH |
643 | if (!dev) |
644 | return; | |
c66ac9db | 645 | |
cf572a96 CH |
646 | spin_lock_irqsave(&dev->execute_task_lock, flags); |
647 | if (cmd->state_active) { | |
648 | list_del(&cmd->state_list); | |
cf572a96 | 649 | cmd->state_active = false; |
c66ac9db | 650 | } |
cf572a96 | 651 | spin_unlock_irqrestore(&dev->execute_task_lock, flags); |
c66ac9db NB |
652 | } |
653 | ||
953bcf7a BVA |
654 | /* |
655 | * This function is called by the target core after the target core has | |
656 | * finished processing a SCSI command or SCSI TMF. Both the regular command | |
657 | * processing code and the code for aborting commands can call this | |
658 | * function. CMD_T_STOP is set if and only if another thread is waiting | |
659 | * inside transport_wait_for_tasks() for t_transport_stop_comp. | |
660 | */ | |
b1a2ecda | 661 | static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd) |
c66ac9db NB |
662 | { |
663 | unsigned long flags; | |
664 | ||
b1a2ecda | 665 | target_remove_from_state_list(cmd); |
f7113a47 | 666 | |
febe562c | 667 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db NB |
668 | /* |
669 | * Determine if frontend context caller is requesting the stopping of | |
e3d6f909 | 670 | * this command for frontend exceptions. |
c66ac9db | 671 | */ |
7d680f3b | 672 | if (cmd->transport_state & CMD_T_STOP) { |
649ee054 BVA |
673 | pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n", |
674 | __func__, __LINE__, cmd->tag); | |
c66ac9db | 675 | |
a1d8b49a | 676 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 677 | |
a95d6511 | 678 | complete_all(&cmd->t_transport_stop_comp); |
c66ac9db NB |
679 | return 1; |
680 | } | |
f7113a47 | 681 | cmd->transport_state &= ~CMD_T_ACTIVE; |
a1d8b49a | 682 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 683 | |
b1a2ecda BVA |
684 | /* |
685 | * Some fabric modules like tcm_loop can release their internally | |
686 | * allocated I/O reference and struct se_cmd now. | |
687 | * | |
688 | * Fabric modules are expected to return '1' here if the se_cmd being | |
689 | * passed is released at this point, or zero if not being released. | |
690 | */ | |
9c28ca4f | 691 | return cmd->se_tfo->check_stop_free(cmd); |
c66ac9db NB |
692 | } |
693 | ||
35e0e757 CH |
694 | static void target_complete_failure_work(struct work_struct *work) |
695 | { | |
696 | struct se_cmd *cmd = container_of(work, struct se_cmd, work); | |
697 | ||
de103c93 CH |
698 | transport_generic_request_failure(cmd, |
699 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE); | |
35e0e757 CH |
700 | } |
701 | ||
6138ed2a | 702 | /* |
d5829eac PB |
703 | * Used when asking transport to copy Sense Data from the underlying |
704 | * Linux/SCSI struct scsi_cmnd | |
6138ed2a | 705 | */ |
d5829eac | 706 | static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd) |
6138ed2a | 707 | { |
6138ed2a | 708 | struct se_device *dev = cmd->se_dev; |
6138ed2a PB |
709 | |
710 | WARN_ON(!cmd->se_lun); | |
711 | ||
712 | if (!dev) | |
d5829eac | 713 | return NULL; |
6138ed2a | 714 | |
d5829eac PB |
715 | if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) |
716 | return NULL; | |
6138ed2a | 717 | |
9c58b7dd | 718 | cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER; |
6138ed2a | 719 | |
d5829eac | 720 | pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n", |
6138ed2a | 721 | dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status); |
9c58b7dd | 722 | return cmd->sense_buffer; |
6138ed2a PB |
723 | } |
724 | ||
c6d66aba MC |
725 | void transport_copy_sense_to_cmd(struct se_cmd *cmd, unsigned char *sense) |
726 | { | |
727 | unsigned char *cmd_sense_buf; | |
728 | unsigned long flags; | |
729 | ||
730 | spin_lock_irqsave(&cmd->t_state_lock, flags); | |
731 | cmd_sense_buf = transport_get_sense_buffer(cmd); | |
732 | if (!cmd_sense_buf) { | |
733 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
734 | return; | |
735 | } | |
736 | ||
737 | cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE; | |
738 | memcpy(cmd_sense_buf, sense, cmd->scsi_sense_length); | |
739 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
740 | } | |
741 | EXPORT_SYMBOL(transport_copy_sense_to_cmd); | |
742 | ||
2c9fa49e BVA |
743 | static void target_handle_abort(struct se_cmd *cmd) |
744 | { | |
745 | bool tas = cmd->transport_state & CMD_T_TAS; | |
746 | bool ack_kref = cmd->se_cmd_flags & SCF_ACK_KREF; | |
747 | int ret; | |
748 | ||
749 | pr_debug("tag %#llx: send_abort_response = %d\n", cmd->tag, tas); | |
750 | ||
751 | if (tas) { | |
752 | if (!(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) { | |
753 | cmd->scsi_status = SAM_STAT_TASK_ABORTED; | |
754 | pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x, ITT: 0x%08llx\n", | |
755 | cmd->t_task_cdb[0], cmd->tag); | |
756 | trace_target_cmd_complete(cmd); | |
757 | ret = cmd->se_tfo->queue_status(cmd); | |
758 | if (ret) { | |
759 | transport_handle_queue_full(cmd, cmd->se_dev, | |
760 | ret, false); | |
761 | return; | |
762 | } | |
763 | } else { | |
764 | cmd->se_tmr_req->response = TMR_FUNCTION_REJECTED; | |
765 | cmd->se_tfo->queue_tm_rsp(cmd); | |
766 | } | |
767 | } else { | |
768 | /* | |
769 | * Allow the fabric driver to unmap any resources before | |
770 | * releasing the descriptor via TFO->release_cmd(). | |
771 | */ | |
772 | cmd->se_tfo->aborted_task(cmd); | |
773 | if (ack_kref) | |
774 | WARN_ON_ONCE(target_put_sess_cmd(cmd) != 0); | |
775 | /* | |
776 | * To do: establish a unit attention condition on the I_T | |
777 | * nexus associated with cmd. See also the paragraph "Aborting | |
778 | * commands" in SAM. | |
779 | */ | |
780 | } | |
781 | ||
782 | WARN_ON_ONCE(kref_read(&cmd->cmd_kref) == 0); | |
783 | ||
2c9fa49e BVA |
784 | transport_cmd_check_stop_to_fabric(cmd); |
785 | } | |
786 | ||
787 | static void target_abort_work(struct work_struct *work) | |
788 | { | |
789 | struct se_cmd *cmd = container_of(work, struct se_cmd, work); | |
790 | ||
791 | target_handle_abort(cmd); | |
792 | } | |
793 | ||
794 | static bool target_cmd_interrupted(struct se_cmd *cmd) | |
795 | { | |
796 | int post_ret; | |
797 | ||
798 | if (cmd->transport_state & CMD_T_ABORTED) { | |
799 | if (cmd->transport_complete_callback) | |
800 | cmd->transport_complete_callback(cmd, false, &post_ret); | |
801 | INIT_WORK(&cmd->work, target_abort_work); | |
802 | queue_work(target_completion_wq, &cmd->work); | |
803 | return true; | |
804 | } else if (cmd->transport_state & CMD_T_STOP) { | |
805 | if (cmd->transport_complete_callback) | |
806 | cmd->transport_complete_callback(cmd, false, &post_ret); | |
807 | complete_all(&cmd->t_transport_stop_comp); | |
808 | return true; | |
809 | } | |
810 | ||
811 | return false; | |
812 | } | |
813 | ||
814 | /* May be called from interrupt context so must not sleep. */ | |
5787cacd | 815 | void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status) |
c66ac9db | 816 | { |
402242c9 | 817 | int success; |
c66ac9db | 818 | unsigned long flags; |
c66ac9db | 819 | |
2c9fa49e BVA |
820 | if (target_cmd_interrupted(cmd)) |
821 | return; | |
822 | ||
5787cacd CH |
823 | cmd->scsi_status = scsi_status; |
824 | ||
a1d8b49a | 825 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
402242c9 MC |
826 | switch (cmd->scsi_status) { |
827 | case SAM_STAT_CHECK_CONDITION: | |
d5829eac | 828 | if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) |
c66ac9db | 829 | success = 1; |
402242c9 MC |
830 | else |
831 | success = 0; | |
832 | break; | |
833 | default: | |
9fe36984 | 834 | success = 1; |
402242c9 | 835 | break; |
c66ac9db NB |
836 | } |
837 | ||
35e0e757 | 838 | cmd->t_state = TRANSPORT_COMPLETE; |
3d28934a | 839 | cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE); |
a1d8b49a | 840 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 841 | |
3ad98002 BVA |
842 | INIT_WORK(&cmd->work, success ? target_complete_ok_work : |
843 | target_complete_failure_work); | |
9095adaa | 844 | if (cmd->se_cmd_flags & SCF_USE_CPUID) |
fb3269ba | 845 | queue_work_on(cmd->cpuid, target_completion_wq, &cmd->work); |
9095adaa QT |
846 | else |
847 | queue_work(target_completion_wq, &cmd->work); | |
c66ac9db | 848 | } |
6bb35e00 CH |
849 | EXPORT_SYMBOL(target_complete_cmd); |
850 | ||
2426bd45 RD |
851 | void target_complete_cmd_with_length(struct se_cmd *cmd, u8 scsi_status, int length) |
852 | { | |
bd813720 LD |
853 | if ((scsi_status == SAM_STAT_GOOD || |
854 | cmd->se_cmd_flags & SCF_TREAT_READ_AS_NORMAL) && | |
855 | length < cmd->data_length) { | |
2426bd45 RD |
856 | if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) { |
857 | cmd->residual_count += cmd->data_length - length; | |
858 | } else { | |
859 | cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT; | |
860 | cmd->residual_count = cmd->data_length - length; | |
861 | } | |
862 | ||
863 | cmd->data_length = length; | |
864 | } | |
865 | ||
866 | target_complete_cmd(cmd, scsi_status); | |
867 | } | |
868 | EXPORT_SYMBOL(target_complete_cmd_with_length); | |
869 | ||
cf572a96 | 870 | static void target_add_to_state_list(struct se_cmd *cmd) |
c66ac9db | 871 | { |
cf572a96 CH |
872 | struct se_device *dev = cmd->se_dev; |
873 | unsigned long flags; | |
c66ac9db | 874 | |
cf572a96 CH |
875 | spin_lock_irqsave(&dev->execute_task_lock, flags); |
876 | if (!cmd->state_active) { | |
877 | list_add_tail(&cmd->state_list, &dev->state_list); | |
878 | cmd->state_active = true; | |
c66ac9db | 879 | } |
cf572a96 | 880 | spin_unlock_irqrestore(&dev->execute_task_lock, flags); |
c66ac9db NB |
881 | } |
882 | ||
07bde79a | 883 | /* |
f147abb4 | 884 | * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status |
07bde79a | 885 | */ |
7a6f0a1e CH |
886 | static void transport_write_pending_qf(struct se_cmd *cmd); |
887 | static void transport_complete_qf(struct se_cmd *cmd); | |
07bde79a | 888 | |
0fd97ccf | 889 | void target_qf_do_work(struct work_struct *work) |
07bde79a NB |
890 | { |
891 | struct se_device *dev = container_of(work, struct se_device, | |
892 | qf_work_queue); | |
bcac364a | 893 | LIST_HEAD(qf_cmd_list); |
07bde79a NB |
894 | struct se_cmd *cmd, *cmd_tmp; |
895 | ||
896 | spin_lock_irq(&dev->qf_cmd_lock); | |
bcac364a RD |
897 | list_splice_init(&dev->qf_cmd_list, &qf_cmd_list); |
898 | spin_unlock_irq(&dev->qf_cmd_lock); | |
07bde79a | 899 | |
bcac364a | 900 | list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) { |
07bde79a | 901 | list_del(&cmd->se_qf_node); |
33940d09 | 902 | atomic_dec_mb(&dev->dev_qf_count); |
07bde79a | 903 | |
6708bb27 | 904 | pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue" |
30c7ca93 | 905 | " context: %s\n", cmd->se_tfo->fabric_name, cmd, |
e057f533 | 906 | (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" : |
07bde79a NB |
907 | (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING" |
908 | : "UNKNOWN"); | |
f7a5cc0b | 909 | |
7a6f0a1e CH |
910 | if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) |
911 | transport_write_pending_qf(cmd); | |
fa7e25cf NB |
912 | else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK || |
913 | cmd->t_state == TRANSPORT_COMPLETE_QF_ERR) | |
7a6f0a1e | 914 | transport_complete_qf(cmd); |
07bde79a | 915 | } |
07bde79a NB |
916 | } |
917 | ||
c66ac9db NB |
918 | unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd) |
919 | { | |
920 | switch (cmd->data_direction) { | |
921 | case DMA_NONE: | |
922 | return "NONE"; | |
923 | case DMA_FROM_DEVICE: | |
924 | return "READ"; | |
925 | case DMA_TO_DEVICE: | |
926 | return "WRITE"; | |
927 | case DMA_BIDIRECTIONAL: | |
928 | return "BIDI"; | |
929 | default: | |
930 | break; | |
931 | } | |
932 | ||
933 | return "UNKNOWN"; | |
934 | } | |
935 | ||
936 | void transport_dump_dev_state( | |
937 | struct se_device *dev, | |
938 | char *b, | |
939 | int *bl) | |
940 | { | |
941 | *bl += sprintf(b + *bl, "Status: "); | |
0fd97ccf | 942 | if (dev->export_count) |
c66ac9db | 943 | *bl += sprintf(b + *bl, "ACTIVATED"); |
0fd97ccf | 944 | else |
c66ac9db | 945 | *bl += sprintf(b + *bl, "DEACTIVATED"); |
c66ac9db | 946 | |
5f41a31d | 947 | *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth); |
11e764bd | 948 | *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n", |
0fd97ccf CH |
949 | dev->dev_attrib.block_size, |
950 | dev->dev_attrib.hw_max_sectors); | |
c66ac9db NB |
951 | *bl += sprintf(b + *bl, " "); |
952 | } | |
953 | ||
c66ac9db NB |
954 | void transport_dump_vpd_proto_id( |
955 | struct t10_vpd *vpd, | |
956 | unsigned char *p_buf, | |
957 | int p_buf_len) | |
958 | { | |
959 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
960 | int len; | |
961 | ||
962 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
963 | len = sprintf(buf, "T10 VPD Protocol Identifier: "); | |
964 | ||
965 | switch (vpd->protocol_identifier) { | |
966 | case 0x00: | |
967 | sprintf(buf+len, "Fibre Channel\n"); | |
968 | break; | |
969 | case 0x10: | |
970 | sprintf(buf+len, "Parallel SCSI\n"); | |
971 | break; | |
972 | case 0x20: | |
973 | sprintf(buf+len, "SSA\n"); | |
974 | break; | |
975 | case 0x30: | |
976 | sprintf(buf+len, "IEEE 1394\n"); | |
977 | break; | |
978 | case 0x40: | |
979 | sprintf(buf+len, "SCSI Remote Direct Memory Access" | |
980 | " Protocol\n"); | |
981 | break; | |
982 | case 0x50: | |
983 | sprintf(buf+len, "Internet SCSI (iSCSI)\n"); | |
984 | break; | |
985 | case 0x60: | |
986 | sprintf(buf+len, "SAS Serial SCSI Protocol\n"); | |
987 | break; | |
988 | case 0x70: | |
989 | sprintf(buf+len, "Automation/Drive Interface Transport" | |
990 | " Protocol\n"); | |
991 | break; | |
992 | case 0x80: | |
993 | sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n"); | |
994 | break; | |
995 | default: | |
996 | sprintf(buf+len, "Unknown 0x%02x\n", | |
997 | vpd->protocol_identifier); | |
998 | break; | |
999 | } | |
1000 | ||
1001 | if (p_buf) | |
1002 | strncpy(p_buf, buf, p_buf_len); | |
1003 | else | |
6708bb27 | 1004 | pr_debug("%s", buf); |
c66ac9db NB |
1005 | } |
1006 | ||
1007 | void | |
1008 | transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83) | |
1009 | { | |
1010 | /* | |
1011 | * Check if the Protocol Identifier Valid (PIV) bit is set.. | |
1012 | * | |
1013 | * from spc3r23.pdf section 7.5.1 | |
1014 | */ | |
1015 | if (page_83[1] & 0x80) { | |
1016 | vpd->protocol_identifier = (page_83[0] & 0xf0); | |
1017 | vpd->protocol_identifier_set = 1; | |
1018 | transport_dump_vpd_proto_id(vpd, NULL, 0); | |
1019 | } | |
1020 | } | |
1021 | EXPORT_SYMBOL(transport_set_vpd_proto_id); | |
1022 | ||
1023 | int transport_dump_vpd_assoc( | |
1024 | struct t10_vpd *vpd, | |
1025 | unsigned char *p_buf, | |
1026 | int p_buf_len) | |
1027 | { | |
1028 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
e3d6f909 AG |
1029 | int ret = 0; |
1030 | int len; | |
c66ac9db NB |
1031 | |
1032 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
1033 | len = sprintf(buf, "T10 VPD Identifier Association: "); | |
1034 | ||
1035 | switch (vpd->association) { | |
1036 | case 0x00: | |
1037 | sprintf(buf+len, "addressed logical unit\n"); | |
1038 | break; | |
1039 | case 0x10: | |
1040 | sprintf(buf+len, "target port\n"); | |
1041 | break; | |
1042 | case 0x20: | |
1043 | sprintf(buf+len, "SCSI target device\n"); | |
1044 | break; | |
1045 | default: | |
1046 | sprintf(buf+len, "Unknown 0x%02x\n", vpd->association); | |
e3d6f909 | 1047 | ret = -EINVAL; |
c66ac9db NB |
1048 | break; |
1049 | } | |
1050 | ||
1051 | if (p_buf) | |
1052 | strncpy(p_buf, buf, p_buf_len); | |
1053 | else | |
6708bb27 | 1054 | pr_debug("%s", buf); |
c66ac9db NB |
1055 | |
1056 | return ret; | |
1057 | } | |
1058 | ||
1059 | int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83) | |
1060 | { | |
1061 | /* | |
1062 | * The VPD identification association.. | |
1063 | * | |
1064 | * from spc3r23.pdf Section 7.6.3.1 Table 297 | |
1065 | */ | |
1066 | vpd->association = (page_83[1] & 0x30); | |
1067 | return transport_dump_vpd_assoc(vpd, NULL, 0); | |
1068 | } | |
1069 | EXPORT_SYMBOL(transport_set_vpd_assoc); | |
1070 | ||
1071 | int transport_dump_vpd_ident_type( | |
1072 | struct t10_vpd *vpd, | |
1073 | unsigned char *p_buf, | |
1074 | int p_buf_len) | |
1075 | { | |
1076 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
e3d6f909 AG |
1077 | int ret = 0; |
1078 | int len; | |
c66ac9db NB |
1079 | |
1080 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
1081 | len = sprintf(buf, "T10 VPD Identifier Type: "); | |
1082 | ||
1083 | switch (vpd->device_identifier_type) { | |
1084 | case 0x00: | |
1085 | sprintf(buf+len, "Vendor specific\n"); | |
1086 | break; | |
1087 | case 0x01: | |
1088 | sprintf(buf+len, "T10 Vendor ID based\n"); | |
1089 | break; | |
1090 | case 0x02: | |
1091 | sprintf(buf+len, "EUI-64 based\n"); | |
1092 | break; | |
1093 | case 0x03: | |
1094 | sprintf(buf+len, "NAA\n"); | |
1095 | break; | |
1096 | case 0x04: | |
1097 | sprintf(buf+len, "Relative target port identifier\n"); | |
1098 | break; | |
1099 | case 0x08: | |
1100 | sprintf(buf+len, "SCSI name string\n"); | |
1101 | break; | |
1102 | default: | |
1103 | sprintf(buf+len, "Unsupported: 0x%02x\n", | |
1104 | vpd->device_identifier_type); | |
e3d6f909 | 1105 | ret = -EINVAL; |
c66ac9db NB |
1106 | break; |
1107 | } | |
1108 | ||
e3d6f909 AG |
1109 | if (p_buf) { |
1110 | if (p_buf_len < strlen(buf)+1) | |
1111 | return -EINVAL; | |
c66ac9db | 1112 | strncpy(p_buf, buf, p_buf_len); |
e3d6f909 | 1113 | } else { |
6708bb27 | 1114 | pr_debug("%s", buf); |
e3d6f909 | 1115 | } |
c66ac9db NB |
1116 | |
1117 | return ret; | |
1118 | } | |
1119 | ||
1120 | int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83) | |
1121 | { | |
1122 | /* | |
1123 | * The VPD identifier type.. | |
1124 | * | |
1125 | * from spc3r23.pdf Section 7.6.3.1 Table 298 | |
1126 | */ | |
1127 | vpd->device_identifier_type = (page_83[1] & 0x0f); | |
1128 | return transport_dump_vpd_ident_type(vpd, NULL, 0); | |
1129 | } | |
1130 | EXPORT_SYMBOL(transport_set_vpd_ident_type); | |
1131 | ||
1132 | int transport_dump_vpd_ident( | |
1133 | struct t10_vpd *vpd, | |
1134 | unsigned char *p_buf, | |
1135 | int p_buf_len) | |
1136 | { | |
1137 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
1138 | int ret = 0; | |
1139 | ||
1140 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
1141 | ||
1142 | switch (vpd->device_identifier_code_set) { | |
1143 | case 0x01: /* Binary */ | |
703d641d DC |
1144 | snprintf(buf, sizeof(buf), |
1145 | "T10 VPD Binary Device Identifier: %s\n", | |
c66ac9db NB |
1146 | &vpd->device_identifier[0]); |
1147 | break; | |
1148 | case 0x02: /* ASCII */ | |
703d641d DC |
1149 | snprintf(buf, sizeof(buf), |
1150 | "T10 VPD ASCII Device Identifier: %s\n", | |
c66ac9db NB |
1151 | &vpd->device_identifier[0]); |
1152 | break; | |
1153 | case 0x03: /* UTF-8 */ | |
703d641d DC |
1154 | snprintf(buf, sizeof(buf), |
1155 | "T10 VPD UTF-8 Device Identifier: %s\n", | |
c66ac9db NB |
1156 | &vpd->device_identifier[0]); |
1157 | break; | |
1158 | default: | |
1159 | sprintf(buf, "T10 VPD Device Identifier encoding unsupported:" | |
1160 | " 0x%02x", vpd->device_identifier_code_set); | |
e3d6f909 | 1161 | ret = -EINVAL; |
c66ac9db NB |
1162 | break; |
1163 | } | |
1164 | ||
1165 | if (p_buf) | |
1166 | strncpy(p_buf, buf, p_buf_len); | |
1167 | else | |
6708bb27 | 1168 | pr_debug("%s", buf); |
c66ac9db NB |
1169 | |
1170 | return ret; | |
1171 | } | |
1172 | ||
1173 | int | |
1174 | transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83) | |
1175 | { | |
1176 | static const char hex_str[] = "0123456789abcdef"; | |
35d1efe8 | 1177 | int j = 0, i = 4; /* offset to start of the identifier */ |
c66ac9db NB |
1178 | |
1179 | /* | |
1180 | * The VPD Code Set (encoding) | |
1181 | * | |
1182 | * from spc3r23.pdf Section 7.6.3.1 Table 296 | |
1183 | */ | |
1184 | vpd->device_identifier_code_set = (page_83[0] & 0x0f); | |
1185 | switch (vpd->device_identifier_code_set) { | |
1186 | case 0x01: /* Binary */ | |
1187 | vpd->device_identifier[j++] = | |
1188 | hex_str[vpd->device_identifier_type]; | |
1189 | while (i < (4 + page_83[3])) { | |
1190 | vpd->device_identifier[j++] = | |
1191 | hex_str[(page_83[i] & 0xf0) >> 4]; | |
1192 | vpd->device_identifier[j++] = | |
1193 | hex_str[page_83[i] & 0x0f]; | |
1194 | i++; | |
1195 | } | |
1196 | break; | |
1197 | case 0x02: /* ASCII */ | |
1198 | case 0x03: /* UTF-8 */ | |
1199 | while (i < (4 + page_83[3])) | |
1200 | vpd->device_identifier[j++] = page_83[i++]; | |
1201 | break; | |
1202 | default: | |
1203 | break; | |
1204 | } | |
1205 | ||
1206 | return transport_dump_vpd_ident(vpd, NULL, 0); | |
1207 | } | |
1208 | EXPORT_SYMBOL(transport_set_vpd_ident); | |
1209 | ||
8f9b5654 NB |
1210 | static sense_reason_t |
1211 | target_check_max_data_sg_nents(struct se_cmd *cmd, struct se_device *dev, | |
1212 | unsigned int size) | |
1213 | { | |
1214 | u32 mtl; | |
1215 | ||
1216 | if (!cmd->se_tfo->max_data_sg_nents) | |
1217 | return TCM_NO_SENSE; | |
1218 | /* | |
1219 | * Check if fabric enforced maximum SGL entries per I/O descriptor | |
1220 | * exceeds se_cmd->data_length. If true, set SCF_UNDERFLOW_BIT + | |
1221 | * residual_count and reduce original cmd->data_length to maximum | |
1222 | * length based on single PAGE_SIZE entry scatter-lists. | |
1223 | */ | |
1224 | mtl = (cmd->se_tfo->max_data_sg_nents * PAGE_SIZE); | |
1225 | if (cmd->data_length > mtl) { | |
1226 | /* | |
1227 | * If an existing CDB overflow is present, calculate new residual | |
1228 | * based on CDB size minus fabric maximum transfer length. | |
1229 | * | |
1230 | * If an existing CDB underflow is present, calculate new residual | |
1231 | * based on original cmd->data_length minus fabric maximum transfer | |
1232 | * length. | |
1233 | * | |
1234 | * Otherwise, set the underflow residual based on cmd->data_length | |
1235 | * minus fabric maximum transfer length. | |
1236 | */ | |
1237 | if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) { | |
1238 | cmd->residual_count = (size - mtl); | |
1239 | } else if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) { | |
1240 | u32 orig_dl = size + cmd->residual_count; | |
1241 | cmd->residual_count = (orig_dl - mtl); | |
1242 | } else { | |
1243 | cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT; | |
1244 | cmd->residual_count = (cmd->data_length - mtl); | |
1245 | } | |
1246 | cmd->data_length = mtl; | |
1247 | /* | |
1248 | * Reset sbc_check_prot() calculated protection payload | |
1249 | * length based upon the new smaller MTL. | |
1250 | */ | |
1251 | if (cmd->prot_length) { | |
1252 | u32 sectors = (mtl / dev->dev_attrib.block_size); | |
1253 | cmd->prot_length = dev->prot_length * sectors; | |
1254 | } | |
1255 | } | |
1256 | return TCM_NO_SENSE; | |
1257 | } | |
1258 | ||
de103c93 CH |
1259 | sense_reason_t |
1260 | target_cmd_size_check(struct se_cmd *cmd, unsigned int size) | |
9b3b8041 CH |
1261 | { |
1262 | struct se_device *dev = cmd->se_dev; | |
1263 | ||
1264 | if (cmd->unknown_data_length) { | |
1265 | cmd->data_length = size; | |
1266 | } else if (size != cmd->data_length) { | |
4ff83daa | 1267 | pr_warn_ratelimited("TARGET_CORE[%s]: Expected Transfer Length:" |
9b3b8041 | 1268 | " %u does not match SCSI CDB Length: %u for SAM Opcode:" |
30c7ca93 | 1269 | " 0x%02x\n", cmd->se_tfo->fabric_name, |
9b3b8041 CH |
1270 | cmd->data_length, size, cmd->t_task_cdb[0]); |
1271 | ||
4ff83daa NB |
1272 | if (cmd->data_direction == DMA_TO_DEVICE) { |
1273 | if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) { | |
1274 | pr_err_ratelimited("Rejecting underflow/overflow" | |
1275 | " for WRITE data CDB\n"); | |
1276 | return TCM_INVALID_CDB_FIELD; | |
1277 | } | |
1278 | /* | |
1279 | * Some fabric drivers like iscsi-target still expect to | |
1280 | * always reject overflow writes. Reject this case until | |
1281 | * full fabric driver level support for overflow writes | |
1282 | * is introduced tree-wide. | |
1283 | */ | |
1284 | if (size > cmd->data_length) { | |
1285 | pr_err_ratelimited("Rejecting overflow for" | |
1286 | " WRITE control CDB\n"); | |
1287 | return TCM_INVALID_CDB_FIELD; | |
1288 | } | |
9b3b8041 CH |
1289 | } |
1290 | /* | |
1291 | * Reject READ_* or WRITE_* with overflow/underflow for | |
1292 | * type SCF_SCSI_DATA_CDB. | |
1293 | */ | |
0fd97ccf | 1294 | if (dev->dev_attrib.block_size != 512) { |
9b3b8041 CH |
1295 | pr_err("Failing OVERFLOW/UNDERFLOW for LBA op" |
1296 | " CDB on non 512-byte sector setup subsystem" | |
1297 | " plugin: %s\n", dev->transport->name); | |
1298 | /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */ | |
de103c93 | 1299 | return TCM_INVALID_CDB_FIELD; |
9b3b8041 | 1300 | } |
4c054ba6 NB |
1301 | /* |
1302 | * For the overflow case keep the existing fabric provided | |
1303 | * ->data_length. Otherwise for the underflow case, reset | |
1304 | * ->data_length to the smaller SCSI expected data transfer | |
1305 | * length. | |
1306 | */ | |
9b3b8041 CH |
1307 | if (size > cmd->data_length) { |
1308 | cmd->se_cmd_flags |= SCF_OVERFLOW_BIT; | |
1309 | cmd->residual_count = (size - cmd->data_length); | |
1310 | } else { | |
1311 | cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT; | |
1312 | cmd->residual_count = (cmd->data_length - size); | |
4c054ba6 | 1313 | cmd->data_length = size; |
9b3b8041 | 1314 | } |
9b3b8041 CH |
1315 | } |
1316 | ||
8f9b5654 | 1317 | return target_check_max_data_sg_nents(cmd, dev, size); |
9b3b8041 | 1318 | |
9b3b8041 CH |
1319 | } |
1320 | ||
c66ac9db NB |
1321 | /* |
1322 | * Used by fabric modules containing a local struct se_cmd within their | |
1323 | * fabric dependent per I/O descriptor. | |
649ee054 BVA |
1324 | * |
1325 | * Preserves the value of @cmd->tag. | |
c66ac9db NB |
1326 | */ |
1327 | void transport_init_se_cmd( | |
1328 | struct se_cmd *cmd, | |
9ac8928e | 1329 | const struct target_core_fabric_ops *tfo, |
c66ac9db NB |
1330 | struct se_session *se_sess, |
1331 | u32 data_length, | |
1332 | int data_direction, | |
1333 | int task_attr, | |
1334 | unsigned char *sense_buffer) | |
1335 | { | |
5951146d | 1336 | INIT_LIST_HEAD(&cmd->se_delayed_node); |
07bde79a | 1337 | INIT_LIST_HEAD(&cmd->se_qf_node); |
a17f091d | 1338 | INIT_LIST_HEAD(&cmd->se_cmd_list); |
cf572a96 | 1339 | INIT_LIST_HEAD(&cmd->state_list); |
a1d8b49a | 1340 | init_completion(&cmd->t_transport_stop_comp); |
a014c364 BVA |
1341 | cmd->free_compl = NULL; |
1342 | cmd->abrt_compl = NULL; | |
a1d8b49a | 1343 | spin_lock_init(&cmd->t_state_lock); |
f2b72d6a | 1344 | INIT_WORK(&cmd->work, NULL); |
1e1110c4 | 1345 | kref_init(&cmd->cmd_kref); |
c66ac9db NB |
1346 | |
1347 | cmd->se_tfo = tfo; | |
1348 | cmd->se_sess = se_sess; | |
1349 | cmd->data_length = data_length; | |
1350 | cmd->data_direction = data_direction; | |
1351 | cmd->sam_task_attr = task_attr; | |
1352 | cmd->sense_buffer = sense_buffer; | |
cf572a96 CH |
1353 | |
1354 | cmd->state_active = false; | |
c66ac9db NB |
1355 | } |
1356 | EXPORT_SYMBOL(transport_init_se_cmd); | |
1357 | ||
de103c93 CH |
1358 | static sense_reason_t |
1359 | transport_check_alloc_task_attr(struct se_cmd *cmd) | |
c66ac9db | 1360 | { |
019c4ca6 CH |
1361 | struct se_device *dev = cmd->se_dev; |
1362 | ||
c66ac9db NB |
1363 | /* |
1364 | * Check if SAM Task Attribute emulation is enabled for this | |
1365 | * struct se_device storage object | |
1366 | */ | |
a3541703 | 1367 | if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH) |
c66ac9db NB |
1368 | return 0; |
1369 | ||
68d81f40 | 1370 | if (cmd->sam_task_attr == TCM_ACA_TAG) { |
6708bb27 | 1371 | pr_debug("SAM Task Attribute ACA" |
c66ac9db | 1372 | " emulation is not supported\n"); |
de103c93 | 1373 | return TCM_INVALID_CDB_FIELD; |
c66ac9db | 1374 | } |
9c31820b | 1375 | |
c66ac9db NB |
1376 | return 0; |
1377 | } | |
1378 | ||
de103c93 CH |
1379 | sense_reason_t |
1380 | target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb) | |
c66ac9db | 1381 | { |
0fd97ccf | 1382 | struct se_device *dev = cmd->se_dev; |
de103c93 | 1383 | sense_reason_t ret; |
c66ac9db | 1384 | |
c66ac9db NB |
1385 | /* |
1386 | * Ensure that the received CDB is less than the max (252 + 8) bytes | |
1387 | * for VARIABLE_LENGTH_CMD | |
1388 | */ | |
1389 | if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) { | |
6708bb27 | 1390 | pr_err("Received SCSI CDB with command_size: %d that" |
c66ac9db NB |
1391 | " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n", |
1392 | scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE); | |
de103c93 | 1393 | return TCM_INVALID_CDB_FIELD; |
c66ac9db NB |
1394 | } |
1395 | /* | |
1396 | * If the received CDB is larger than TCM_MAX_COMMAND_SIZE, | |
1397 | * allocate the additional extended CDB buffer now.. Otherwise | |
1398 | * setup the pointer from __t_task_cdb to t_task_cdb. | |
1399 | */ | |
a1d8b49a AG |
1400 | if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) { |
1401 | cmd->t_task_cdb = kzalloc(scsi_command_size(cdb), | |
c66ac9db | 1402 | GFP_KERNEL); |
6708bb27 AG |
1403 | if (!cmd->t_task_cdb) { |
1404 | pr_err("Unable to allocate cmd->t_task_cdb" | |
a1d8b49a | 1405 | " %u > sizeof(cmd->__t_task_cdb): %lu ops\n", |
c66ac9db | 1406 | scsi_command_size(cdb), |
a1d8b49a | 1407 | (unsigned long)sizeof(cmd->__t_task_cdb)); |
de103c93 | 1408 | return TCM_OUT_OF_RESOURCES; |
c66ac9db NB |
1409 | } |
1410 | } else | |
a1d8b49a | 1411 | cmd->t_task_cdb = &cmd->__t_task_cdb[0]; |
c66ac9db | 1412 | /* |
a1d8b49a | 1413 | * Copy the original CDB into cmd-> |
c66ac9db | 1414 | */ |
a1d8b49a | 1415 | memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb)); |
cb4f4d3c | 1416 | |
e5c0d6ad RD |
1417 | trace_target_sequencer_start(cmd); |
1418 | ||
0fd97ccf | 1419 | ret = dev->transport->parse_cdb(cmd); |
568e1f65 JE |
1420 | if (ret == TCM_UNSUPPORTED_SCSI_OPCODE) |
1421 | pr_warn_ratelimited("%s/%s: Unsupported SCSI Opcode 0x%02x, sending CHECK_CONDITION.\n", | |
30c7ca93 | 1422 | cmd->se_tfo->fabric_name, |
568e1f65 JE |
1423 | cmd->se_sess->se_node_acl->initiatorname, |
1424 | cmd->t_task_cdb[0]); | |
de103c93 CH |
1425 | if (ret) |
1426 | return ret; | |
1427 | ||
1428 | ret = transport_check_alloc_task_attr(cmd); | |
1429 | if (ret) | |
c66ac9db | 1430 | return ret; |
cb4f4d3c | 1431 | |
cb4f4d3c | 1432 | cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE; |
4cc987ea | 1433 | atomic_long_inc(&cmd->se_lun->lun_stats.cmd_pdus); |
c66ac9db NB |
1434 | return 0; |
1435 | } | |
a12f41f8 | 1436 | EXPORT_SYMBOL(target_setup_cmd_from_cdb); |
c66ac9db | 1437 | |
695434e1 NB |
1438 | /* |
1439 | * Used by fabric module frontends to queue tasks directly. | |
ac75d8be | 1440 | * May only be used from process context. |
695434e1 NB |
1441 | */ |
1442 | int transport_handle_cdb_direct( | |
1443 | struct se_cmd *cmd) | |
1444 | { | |
de103c93 | 1445 | sense_reason_t ret; |
dd8ae59d | 1446 | |
695434e1 NB |
1447 | if (!cmd->se_lun) { |
1448 | dump_stack(); | |
6708bb27 | 1449 | pr_err("cmd->se_lun is NULL\n"); |
695434e1 NB |
1450 | return -EINVAL; |
1451 | } | |
1452 | if (in_interrupt()) { | |
1453 | dump_stack(); | |
6708bb27 | 1454 | pr_err("transport_generic_handle_cdb cannot be called" |
695434e1 NB |
1455 | " from interrupt context\n"); |
1456 | return -EINVAL; | |
1457 | } | |
dd8ae59d | 1458 | /* |
af877292 CH |
1459 | * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that |
1460 | * outstanding descriptors are handled correctly during shutdown via | |
1461 | * transport_wait_for_tasks() | |
dd8ae59d NB |
1462 | * |
1463 | * Also, we don't take cmd->t_state_lock here as we only expect | |
1464 | * this to be called for initial descriptor submission. | |
1465 | */ | |
1466 | cmd->t_state = TRANSPORT_NEW_CMD; | |
7d680f3b CH |
1467 | cmd->transport_state |= CMD_T_ACTIVE; |
1468 | ||
dd8ae59d NB |
1469 | /* |
1470 | * transport_generic_new_cmd() is already handling QUEUE_FULL, | |
1471 | * so follow TRANSPORT_NEW_CMD processing thread context usage | |
1472 | * and call transport_generic_request_failure() if necessary.. | |
1473 | */ | |
1474 | ret = transport_generic_new_cmd(cmd); | |
de103c93 CH |
1475 | if (ret) |
1476 | transport_generic_request_failure(cmd, ret); | |
dd8ae59d | 1477 | return 0; |
695434e1 NB |
1478 | } |
1479 | EXPORT_SYMBOL(transport_handle_cdb_direct); | |
1480 | ||
c5ff8d6b | 1481 | sense_reason_t |
de103c93 CH |
1482 | transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl, |
1483 | u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count) | |
1484 | { | |
1485 | if (!sgl || !sgl_count) | |
1486 | return 0; | |
1487 | ||
1488 | /* | |
1489 | * Reject SCSI data overflow with map_mem_to_cmd() as incoming | |
1490 | * scatterlists already have been set to follow what the fabric | |
1491 | * passes for the original expected data transfer length. | |
1492 | */ | |
1493 | if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) { | |
1494 | pr_warn("Rejecting SCSI DATA overflow for fabric using" | |
1495 | " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n"); | |
1496 | return TCM_INVALID_CDB_FIELD; | |
1497 | } | |
1498 | ||
1499 | cmd->t_data_sg = sgl; | |
1500 | cmd->t_data_nents = sgl_count; | |
b32bd0a8 IT |
1501 | cmd->t_bidi_data_sg = sgl_bidi; |
1502 | cmd->t_bidi_data_nents = sgl_bidi_count; | |
de103c93 | 1503 | |
de103c93 CH |
1504 | cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC; |
1505 | return 0; | |
1506 | } | |
1507 | ||
9ad97b8b | 1508 | /** |
a026757f NB |
1509 | * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized |
1510 | * se_cmd + use pre-allocated SGL memory. | |
a6360785 NB |
1511 | * |
1512 | * @se_cmd: command descriptor to submit | |
1513 | * @se_sess: associated se_sess for endpoint | |
1514 | * @cdb: pointer to SCSI CDB | |
1515 | * @sense: pointer to SCSI sense buffer | |
1516 | * @unpacked_lun: unpacked LUN to reference for struct se_lun | |
1517 | * @data_length: fabric expected data transfer length | |
9ad97b8b | 1518 | * @task_attr: SAM task attribute |
a6360785 NB |
1519 | * @data_dir: DMA data direction |
1520 | * @flags: flags for command submission from target_sc_flags_tables | |
a026757f NB |
1521 | * @sgl: struct scatterlist memory for unidirectional mapping |
1522 | * @sgl_count: scatterlist count for unidirectional mapping | |
1523 | * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping | |
1524 | * @sgl_bidi_count: scatterlist count for bidirectional READ mapping | |
def2b339 NB |
1525 | * @sgl_prot: struct scatterlist memory protection information |
1526 | * @sgl_prot_count: scatterlist count for protection information | |
a6360785 | 1527 | * |
649ee054 BVA |
1528 | * Task tags are supported if the caller has set @se_cmd->tag. |
1529 | * | |
d6dfc868 RD |
1530 | * Returns non zero to signal active I/O shutdown failure. All other |
1531 | * setup exceptions will be returned as a SCSI CHECK_CONDITION response, | |
1532 | * but still return zero here. | |
1533 | * | |
a6360785 NB |
1534 | * This may only be called from process context, and also currently |
1535 | * assumes internal allocation of fabric payload buffer by target-core. | |
a026757f NB |
1536 | */ |
1537 | int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess, | |
f2d30680 | 1538 | unsigned char *cdb, unsigned char *sense, u64 unpacked_lun, |
a026757f NB |
1539 | u32 data_length, int task_attr, int data_dir, int flags, |
1540 | struct scatterlist *sgl, u32 sgl_count, | |
def2b339 NB |
1541 | struct scatterlist *sgl_bidi, u32 sgl_bidi_count, |
1542 | struct scatterlist *sgl_prot, u32 sgl_prot_count) | |
a6360785 NB |
1543 | { |
1544 | struct se_portal_group *se_tpg; | |
de103c93 CH |
1545 | sense_reason_t rc; |
1546 | int ret; | |
a6360785 NB |
1547 | |
1548 | se_tpg = se_sess->se_tpg; | |
1549 | BUG_ON(!se_tpg); | |
1550 | BUG_ON(se_cmd->se_tfo || se_cmd->se_sess); | |
1551 | BUG_ON(in_interrupt()); | |
1552 | /* | |
1553 | * Initialize se_cmd for target operation. From this point | |
1554 | * exceptions are handled by sending exception status via | |
1555 | * target_core_fabric_ops->queue_status() callback | |
1556 | */ | |
1557 | transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, | |
1558 | data_length, data_dir, task_attr, sense); | |
9095adaa QT |
1559 | |
1560 | if (flags & TARGET_SCF_USE_CPUID) | |
1561 | se_cmd->se_cmd_flags |= SCF_USE_CPUID; | |
1562 | else | |
1563 | se_cmd->cpuid = WORK_CPU_UNBOUND; | |
1564 | ||
b0d79946 SAS |
1565 | if (flags & TARGET_SCF_UNKNOWN_SIZE) |
1566 | se_cmd->unknown_data_length = 1; | |
a6360785 NB |
1567 | /* |
1568 | * Obtain struct se_cmd->cmd_kref reference and add new cmd to | |
1569 | * se_sess->sess_cmd_list. A second kref_get here is necessary | |
1570 | * for fabrics using TARGET_SCF_ACK_KREF that expect a second | |
1571 | * kref_put() to happen during fabric packet acknowledgement. | |
1572 | */ | |
afc16604 | 1573 | ret = target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF); |
de103c93 CH |
1574 | if (ret) |
1575 | return ret; | |
a6360785 NB |
1576 | /* |
1577 | * Signal bidirectional data payloads to target-core | |
1578 | */ | |
1579 | if (flags & TARGET_SCF_BIDI_OP) | |
1580 | se_cmd->se_cmd_flags |= SCF_BIDI; | |
1581 | /* | |
1582 | * Locate se_lun pointer and attach it to struct se_cmd | |
1583 | */ | |
de103c93 CH |
1584 | rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun); |
1585 | if (rc) { | |
1586 | transport_send_check_condition_and_sense(se_cmd, rc, 0); | |
afc16604 | 1587 | target_put_sess_cmd(se_cmd); |
d6dfc868 | 1588 | return 0; |
735703ca | 1589 | } |
b5b8e298 SG |
1590 | |
1591 | rc = target_setup_cmd_from_cdb(se_cmd, cdb); | |
1592 | if (rc != 0) { | |
1593 | transport_generic_request_failure(se_cmd, rc); | |
1594 | return 0; | |
1595 | } | |
1596 | ||
def2b339 NB |
1597 | /* |
1598 | * Save pointers for SGLs containing protection information, | |
1599 | * if present. | |
1600 | */ | |
1601 | if (sgl_prot_count) { | |
1602 | se_cmd->t_prot_sg = sgl_prot; | |
1603 | se_cmd->t_prot_nents = sgl_prot_count; | |
5835812f | 1604 | se_cmd->se_cmd_flags |= SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC; |
def2b339 | 1605 | } |
d6e0175c | 1606 | |
a026757f NB |
1607 | /* |
1608 | * When a non zero sgl_count has been passed perform SGL passthrough | |
1609 | * mapping for pre-allocated fabric memory instead of having target | |
1610 | * core perform an internal SGL allocation.. | |
1611 | */ | |
1612 | if (sgl_count != 0) { | |
1613 | BUG_ON(!sgl); | |
1614 | ||
944981c7 NB |
1615 | /* |
1616 | * A work-around for tcm_loop as some userspace code via | |
1617 | * scsi-generic do not memset their associated read buffers, | |
1618 | * so go ahead and do that here for type non-data CDBs. Also | |
1619 | * note that this is currently guaranteed to be a single SGL | |
1620 | * for this case by target core in target_setup_cmd_from_cdb() | |
1621 | * -> transport_generic_cmd_sequencer(). | |
1622 | */ | |
1623 | if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) && | |
1624 | se_cmd->data_direction == DMA_FROM_DEVICE) { | |
1625 | unsigned char *buf = NULL; | |
1626 | ||
1627 | if (sgl) | |
1628 | buf = kmap(sg_page(sgl)) + sgl->offset; | |
1629 | ||
1630 | if (buf) { | |
1631 | memset(buf, 0, sgl->length); | |
1632 | kunmap(sg_page(sgl)); | |
1633 | } | |
1634 | } | |
1635 | ||
a026757f NB |
1636 | rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count, |
1637 | sgl_bidi, sgl_bidi_count); | |
1638 | if (rc != 0) { | |
de103c93 | 1639 | transport_generic_request_failure(se_cmd, rc); |
a026757f NB |
1640 | return 0; |
1641 | } | |
1642 | } | |
def2b339 | 1643 | |
11e319ed AG |
1644 | /* |
1645 | * Check if we need to delay processing because of ALUA | |
1646 | * Active/NonOptimized primary access state.. | |
1647 | */ | |
1648 | core_alua_check_nonop_delay(se_cmd); | |
1649 | ||
a6360785 | 1650 | transport_handle_cdb_direct(se_cmd); |
d6dfc868 | 1651 | return 0; |
a6360785 | 1652 | } |
a026757f NB |
1653 | EXPORT_SYMBOL(target_submit_cmd_map_sgls); |
1654 | ||
9ad97b8b | 1655 | /** |
a026757f NB |
1656 | * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd |
1657 | * | |
1658 | * @se_cmd: command descriptor to submit | |
1659 | * @se_sess: associated se_sess for endpoint | |
1660 | * @cdb: pointer to SCSI CDB | |
1661 | * @sense: pointer to SCSI sense buffer | |
1662 | * @unpacked_lun: unpacked LUN to reference for struct se_lun | |
1663 | * @data_length: fabric expected data transfer length | |
9ad97b8b | 1664 | * @task_attr: SAM task attribute |
a026757f NB |
1665 | * @data_dir: DMA data direction |
1666 | * @flags: flags for command submission from target_sc_flags_tables | |
1667 | * | |
649ee054 BVA |
1668 | * Task tags are supported if the caller has set @se_cmd->tag. |
1669 | * | |
a026757f NB |
1670 | * Returns non zero to signal active I/O shutdown failure. All other |
1671 | * setup exceptions will be returned as a SCSI CHECK_CONDITION response, | |
1672 | * but still return zero here. | |
1673 | * | |
1674 | * This may only be called from process context, and also currently | |
1675 | * assumes internal allocation of fabric payload buffer by target-core. | |
1676 | * | |
1677 | * It also assumes interal target core SGL memory allocation. | |
1678 | */ | |
1679 | int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess, | |
f2d30680 | 1680 | unsigned char *cdb, unsigned char *sense, u64 unpacked_lun, |
a026757f NB |
1681 | u32 data_length, int task_attr, int data_dir, int flags) |
1682 | { | |
1683 | return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense, | |
1684 | unpacked_lun, data_length, task_attr, data_dir, | |
def2b339 | 1685 | flags, NULL, 0, NULL, 0, NULL, 0); |
a026757f | 1686 | } |
a6360785 NB |
1687 | EXPORT_SYMBOL(target_submit_cmd); |
1688 | ||
9f0d05c2 NB |
1689 | static void target_complete_tmr_failure(struct work_struct *work) |
1690 | { | |
1691 | struct se_cmd *se_cmd = container_of(work, struct se_cmd, work); | |
1692 | ||
1693 | se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST; | |
1694 | se_cmd->se_tfo->queue_tm_rsp(se_cmd); | |
5a3b6fc0 RD |
1695 | |
1696 | transport_cmd_check_stop_to_fabric(se_cmd); | |
9f0d05c2 NB |
1697 | } |
1698 | ||
5465e7d3 NB |
1699 | static bool target_lookup_lun_from_tag(struct se_session *se_sess, u64 tag, |
1700 | u64 *unpacked_lun) | |
1701 | { | |
1702 | struct se_cmd *se_cmd; | |
1703 | unsigned long flags; | |
1704 | bool ret = false; | |
1705 | ||
1706 | spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); | |
1707 | list_for_each_entry(se_cmd, &se_sess->sess_cmd_list, se_cmd_list) { | |
1708 | if (se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB) | |
1709 | continue; | |
1710 | ||
1711 | if (se_cmd->tag == tag) { | |
1712 | *unpacked_lun = se_cmd->orig_fe_lun; | |
1713 | ret = true; | |
1714 | break; | |
1715 | } | |
1716 | } | |
1717 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); | |
1718 | ||
1719 | return ret; | |
1720 | } | |
1721 | ||
ea98d7f9 AG |
1722 | /** |
1723 | * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd | |
1724 | * for TMR CDBs | |
1725 | * | |
1726 | * @se_cmd: command descriptor to submit | |
1727 | * @se_sess: associated se_sess for endpoint | |
1728 | * @sense: pointer to SCSI sense buffer | |
1729 | * @unpacked_lun: unpacked LUN to reference for struct se_lun | |
1e74aff1 | 1730 | * @fabric_tmr_ptr: fabric context for TMR req |
ea98d7f9 | 1731 | * @tm_type: Type of TM request |
c0974f89 NB |
1732 | * @gfp: gfp type for caller |
1733 | * @tag: referenced task tag for TMR_ABORT_TASK | |
c7042cae | 1734 | * @flags: submit cmd flags |
ea98d7f9 AG |
1735 | * |
1736 | * Callable from all contexts. | |
1737 | **/ | |
1738 | ||
c7042cae | 1739 | int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess, |
f2d30680 | 1740 | unsigned char *sense, u64 unpacked_lun, |
c0974f89 | 1741 | void *fabric_tmr_ptr, unsigned char tm_type, |
5261d86c | 1742 | gfp_t gfp, u64 tag, int flags) |
ea98d7f9 AG |
1743 | { |
1744 | struct se_portal_group *se_tpg; | |
1745 | int ret; | |
1746 | ||
1747 | se_tpg = se_sess->se_tpg; | |
1748 | BUG_ON(!se_tpg); | |
1749 | ||
1750 | transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, | |
68d81f40 | 1751 | 0, DMA_NONE, TCM_SIMPLE_TAG, sense); |
c7042cae NB |
1752 | /* |
1753 | * FIXME: Currently expect caller to handle se_cmd->se_tmr_req | |
1754 | * allocation failure. | |
1755 | */ | |
c0974f89 | 1756 | ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp); |
c7042cae NB |
1757 | if (ret < 0) |
1758 | return -ENOMEM; | |
ea98d7f9 | 1759 | |
c0974f89 NB |
1760 | if (tm_type == TMR_ABORT_TASK) |
1761 | se_cmd->se_tmr_req->ref_task_tag = tag; | |
1762 | ||
ea98d7f9 | 1763 | /* See target_submit_cmd for commentary */ |
afc16604 | 1764 | ret = target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF); |
bc187ea6 RD |
1765 | if (ret) { |
1766 | core_tmr_release_req(se_cmd->se_tmr_req); | |
1767 | return ret; | |
1768 | } | |
5465e7d3 NB |
1769 | /* |
1770 | * If this is ABORT_TASK with no explicit fabric provided LUN, | |
1771 | * go ahead and search active session tags for a match to figure | |
1772 | * out unpacked_lun for the original se_cmd. | |
1773 | */ | |
1774 | if (tm_type == TMR_ABORT_TASK && (flags & TARGET_SCF_LOOKUP_LUN_FROM_TAG)) { | |
1775 | if (!target_lookup_lun_from_tag(se_sess, tag, &unpacked_lun)) | |
1776 | goto failure; | |
1777 | } | |
ea98d7f9 | 1778 | |
ea98d7f9 | 1779 | ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun); |
5465e7d3 NB |
1780 | if (ret) |
1781 | goto failure; | |
1782 | ||
ea98d7f9 | 1783 | transport_generic_handle_tmr(se_cmd); |
c7042cae | 1784 | return 0; |
5465e7d3 NB |
1785 | |
1786 | /* | |
1787 | * For callback during failure handling, push this work off | |
1788 | * to process context with TMR_LUN_DOES_NOT_EXIST status. | |
1789 | */ | |
1790 | failure: | |
1791 | INIT_WORK(&se_cmd->work, target_complete_tmr_failure); | |
1792 | schedule_work(&se_cmd->work); | |
1793 | return 0; | |
ea98d7f9 AG |
1794 | } |
1795 | EXPORT_SYMBOL(target_submit_tmr); | |
1796 | ||
c66ac9db NB |
1797 | /* |
1798 | * Handle SAM-esque emulation for generic transport request failures. | |
1799 | */ | |
de103c93 CH |
1800 | void transport_generic_request_failure(struct se_cmd *cmd, |
1801 | sense_reason_t sense_reason) | |
c66ac9db | 1802 | { |
5841734f | 1803 | int ret = 0, post_ret; |
07bde79a | 1804 | |
c00e6220 BVA |
1805 | pr_debug("-----[ Storage Engine Exception; sense_reason %d\n", |
1806 | sense_reason); | |
1807 | target_show_cmd("-----[ ", cmd); | |
c66ac9db | 1808 | |
c66ac9db NB |
1809 | /* |
1810 | * For SAM Task Attribute emulation for failed struct se_cmd | |
1811 | */ | |
019c4ca6 | 1812 | transport_complete_task_attr(cmd); |
fd2f928b | 1813 | |
aa73237d | 1814 | if (cmd->transport_complete_callback) |
5841734f | 1815 | cmd->transport_complete_callback(cmd, false, &post_ret); |
c66ac9db | 1816 | |
2c9fa49e BVA |
1817 | if (cmd->transport_state & CMD_T_ABORTED) { |
1818 | INIT_WORK(&cmd->work, target_abort_work); | |
1819 | queue_work(target_completion_wq, &cmd->work); | |
fd2f928b | 1820 | return; |
2c9fa49e | 1821 | } |
fd2f928b | 1822 | |
de103c93 | 1823 | switch (sense_reason) { |
03e98c9e NB |
1824 | case TCM_NON_EXISTENT_LUN: |
1825 | case TCM_UNSUPPORTED_SCSI_OPCODE: | |
1826 | case TCM_INVALID_CDB_FIELD: | |
1827 | case TCM_INVALID_PARAMETER_LIST: | |
bb992e72 | 1828 | case TCM_PARAMETER_LIST_LENGTH_ERROR: |
03e98c9e NB |
1829 | case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE: |
1830 | case TCM_UNKNOWN_MODE_PAGE: | |
1831 | case TCM_WRITE_PROTECTED: | |
e2397c70 | 1832 | case TCM_ADDRESS_OUT_OF_RANGE: |
03e98c9e NB |
1833 | case TCM_CHECK_CONDITION_ABORT_CMD: |
1834 | case TCM_CHECK_CONDITION_UNIT_ATTENTION: | |
1835 | case TCM_CHECK_CONDITION_NOT_READY: | |
94387aa7 NB |
1836 | case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED: |
1837 | case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED: | |
1838 | case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED: | |
449a1378 | 1839 | case TCM_COPY_TARGET_DEVICE_NOT_REACHABLE: |
e8642120 DD |
1840 | case TCM_TOO_MANY_TARGET_DESCS: |
1841 | case TCM_UNSUPPORTED_TARGET_DESC_TYPE_CODE: | |
1842 | case TCM_TOO_MANY_SEGMENT_DESCS: | |
1843 | case TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE: | |
c66ac9db | 1844 | break; |
de103c93 | 1845 | case TCM_OUT_OF_RESOURCES: |
a271eac4 MC |
1846 | cmd->scsi_status = SAM_STAT_TASK_SET_FULL; |
1847 | goto queue_status; | |
d120c708 MC |
1848 | case TCM_LUN_BUSY: |
1849 | cmd->scsi_status = SAM_STAT_BUSY; | |
1850 | goto queue_status; | |
03e98c9e | 1851 | case TCM_RESERVATION_CONFLICT: |
c66ac9db NB |
1852 | /* |
1853 | * No SENSE Data payload for this case, set SCSI Status | |
1854 | * and queue the response to $FABRIC_MOD. | |
1855 | * | |
1856 | * Uses linux/include/scsi/scsi.h SAM status codes defs | |
1857 | */ | |
1858 | cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT; | |
1859 | /* | |
1860 | * For UA Interlock Code 11b, a RESERVATION CONFLICT will | |
1861 | * establish a UNIT ATTENTION with PREVIOUS RESERVATION | |
1862 | * CONFLICT STATUS. | |
1863 | * | |
1864 | * See spc4r17, section 7.4.6 Control Mode Page, Table 349 | |
1865 | */ | |
e3d6f909 | 1866 | if (cmd->se_sess && |
c51c8e7b HR |
1867 | cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2) { |
1868 | target_ua_allocate_lun(cmd->se_sess->se_node_acl, | |
1869 | cmd->orig_fe_lun, 0x2C, | |
1870 | ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS); | |
1871 | } | |
a271eac4 MC |
1872 | |
1873 | goto queue_status; | |
c66ac9db | 1874 | default: |
6708bb27 | 1875 | pr_err("Unknown transport error for CDB 0x%02x: %d\n", |
de103c93 CH |
1876 | cmd->t_task_cdb[0], sense_reason); |
1877 | sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; | |
c66ac9db NB |
1878 | break; |
1879 | } | |
f3146437 | 1880 | |
de103c93 | 1881 | ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0); |
fa7e25cf | 1882 | if (ret) |
03e98c9e | 1883 | goto queue_full; |
07bde79a | 1884 | |
c66ac9db | 1885 | check_stop: |
06b967e4 | 1886 | transport_cmd_check_stop_to_fabric(cmd); |
07bde79a NB |
1887 | return; |
1888 | ||
a271eac4 MC |
1889 | queue_status: |
1890 | trace_target_cmd_complete(cmd); | |
1891 | ret = cmd->se_tfo->queue_status(cmd); | |
1892 | if (!ret) | |
1893 | goto check_stop; | |
07bde79a | 1894 | queue_full: |
fa7e25cf | 1895 | transport_handle_queue_full(cmd, cmd->se_dev, ret, false); |
c66ac9db | 1896 | } |
2fbff127 | 1897 | EXPORT_SYMBOL(transport_generic_request_failure); |
c66ac9db | 1898 | |
dff0ca9e | 1899 | void __target_execute_cmd(struct se_cmd *cmd, bool do_checks) |
c66ac9db | 1900 | { |
de103c93 | 1901 | sense_reason_t ret; |
5f41a31d | 1902 | |
dff0ca9e NB |
1903 | if (!cmd->execute_cmd) { |
1904 | ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
1905 | goto err; | |
1906 | } | |
1907 | if (do_checks) { | |
1908 | /* | |
1909 | * Check for an existing UNIT ATTENTION condition after | |
1910 | * target_handle_task_attr() has done SAM task attr | |
1911 | * checking, and possibly have already defered execution | |
1912 | * out to target_restart_delayed_cmds() context. | |
1913 | */ | |
1914 | ret = target_scsi3_ua_check(cmd); | |
1915 | if (ret) | |
1916 | goto err; | |
1917 | ||
1918 | ret = target_alua_state_check(cmd); | |
1919 | if (ret) | |
1920 | goto err; | |
5f41a31d | 1921 | |
dff0ca9e NB |
1922 | ret = target_check_reservation(cmd); |
1923 | if (ret) { | |
1924 | cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT; | |
1925 | goto err; | |
de103c93 | 1926 | } |
5f41a31d | 1927 | } |
dff0ca9e NB |
1928 | |
1929 | ret = cmd->execute_cmd(cmd); | |
1930 | if (!ret) | |
1931 | return; | |
1932 | err: | |
1933 | spin_lock_irq(&cmd->t_state_lock); | |
fd5e64de | 1934 | cmd->transport_state &= ~CMD_T_SENT; |
dff0ca9e NB |
1935 | spin_unlock_irq(&cmd->t_state_lock); |
1936 | ||
1937 | transport_generic_request_failure(cmd, ret); | |
5f41a31d CH |
1938 | } |
1939 | ||
aa58b531 NB |
1940 | static int target_write_prot_action(struct se_cmd *cmd) |
1941 | { | |
5132d1e6 | 1942 | u32 sectors; |
aa58b531 NB |
1943 | /* |
1944 | * Perform WRITE_INSERT of PI using software emulation when backend | |
1945 | * device has PI enabled, if the transport has not already generated | |
1946 | * PI using hardware WRITE_INSERT offload. | |
1947 | */ | |
1948 | switch (cmd->prot_op) { | |
1949 | case TARGET_PROT_DOUT_INSERT: | |
1950 | if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_INSERT)) | |
1951 | sbc_dif_generate(cmd); | |
1952 | break; | |
5132d1e6 NB |
1953 | case TARGET_PROT_DOUT_STRIP: |
1954 | if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_STRIP) | |
1955 | break; | |
1956 | ||
1957 | sectors = cmd->data_length >> ilog2(cmd->se_dev->dev_attrib.block_size); | |
f75b6fae SG |
1958 | cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba, |
1959 | sectors, 0, cmd->t_prot_sg, 0); | |
5132d1e6 NB |
1960 | if (unlikely(cmd->pi_err)) { |
1961 | spin_lock_irq(&cmd->t_state_lock); | |
fd5e64de | 1962 | cmd->transport_state &= ~CMD_T_SENT; |
5132d1e6 NB |
1963 | spin_unlock_irq(&cmd->t_state_lock); |
1964 | transport_generic_request_failure(cmd, cmd->pi_err); | |
1965 | return -1; | |
1966 | } | |
1967 | break; | |
aa58b531 NB |
1968 | default: |
1969 | break; | |
1970 | } | |
1971 | ||
1972 | return 0; | |
1973 | } | |
1974 | ||
019c4ca6 | 1975 | static bool target_handle_task_attr(struct se_cmd *cmd) |
5f41a31d CH |
1976 | { |
1977 | struct se_device *dev = cmd->se_dev; | |
1978 | ||
a3541703 | 1979 | if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH) |
019c4ca6 | 1980 | return false; |
5f41a31d | 1981 | |
410c29df NB |
1982 | cmd->se_cmd_flags |= SCF_TASK_ATTR_SET; |
1983 | ||
c66ac9db | 1984 | /* |
25985edc | 1985 | * Check for the existence of HEAD_OF_QUEUE, and if true return 1 |
c66ac9db NB |
1986 | * to allow the passed struct se_cmd list of tasks to the front of the list. |
1987 | */ | |
5f41a31d | 1988 | switch (cmd->sam_task_attr) { |
68d81f40 | 1989 | case TCM_HEAD_TAG: |
9c31820b RD |
1990 | pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x\n", |
1991 | cmd->t_task_cdb[0]); | |
019c4ca6 | 1992 | return false; |
68d81f40 | 1993 | case TCM_ORDERED_TAG: |
33940d09 | 1994 | atomic_inc_mb(&dev->dev_ordered_sync); |
c66ac9db | 1995 | |
9c31820b RD |
1996 | pr_debug("Added ORDERED for CDB: 0x%02x to ordered list\n", |
1997 | cmd->t_task_cdb[0]); | |
5f41a31d | 1998 | |
c66ac9db | 1999 | /* |
5f41a31d CH |
2000 | * Execute an ORDERED command if no other older commands |
2001 | * exist that need to be completed first. | |
c66ac9db | 2002 | */ |
5f41a31d | 2003 | if (!atomic_read(&dev->simple_cmds)) |
019c4ca6 | 2004 | return false; |
5f41a31d CH |
2005 | break; |
2006 | default: | |
c66ac9db NB |
2007 | /* |
2008 | * For SIMPLE and UNTAGGED Task Attribute commands | |
2009 | */ | |
33940d09 | 2010 | atomic_inc_mb(&dev->simple_cmds); |
5f41a31d | 2011 | break; |
c66ac9db | 2012 | } |
5f41a31d | 2013 | |
019c4ca6 CH |
2014 | if (atomic_read(&dev->dev_ordered_sync) == 0) |
2015 | return false; | |
c66ac9db | 2016 | |
019c4ca6 CH |
2017 | spin_lock(&dev->delayed_cmd_lock); |
2018 | list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list); | |
2019 | spin_unlock(&dev->delayed_cmd_lock); | |
2020 | ||
9c31820b RD |
2021 | pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to delayed CMD listn", |
2022 | cmd->t_task_cdb[0], cmd->sam_task_attr); | |
019c4ca6 CH |
2023 | return true; |
2024 | } | |
2025 | ||
2026 | void target_execute_cmd(struct se_cmd *cmd) | |
2027 | { | |
019c4ca6 CH |
2028 | /* |
2029 | * Determine if frontend context caller is requesting the stopping of | |
2030 | * this command for frontend exceptions. | |
310d3d31 | 2031 | * |
4240d448 | 2032 | * If the received CDB has already been aborted stop processing it here. |
019c4ca6 | 2033 | */ |
2c9fa49e | 2034 | if (target_cmd_interrupted(cmd)) |
019c4ca6 | 2035 | return; |
019c4ca6 | 2036 | |
2c9fa49e | 2037 | spin_lock_irq(&cmd->t_state_lock); |
019c4ca6 | 2038 | cmd->t_state = TRANSPORT_PROCESSING; |
fd5e64de | 2039 | cmd->transport_state |= CMD_T_ACTIVE | CMD_T_SENT; |
019c4ca6 | 2040 | spin_unlock_irq(&cmd->t_state_lock); |
aa58b531 NB |
2041 | |
2042 | if (target_write_prot_action(cmd)) | |
2043 | return; | |
019c4ca6 | 2044 | |
1a398b97 NB |
2045 | if (target_handle_task_attr(cmd)) { |
2046 | spin_lock_irq(&cmd->t_state_lock); | |
fd5e64de | 2047 | cmd->transport_state &= ~CMD_T_SENT; |
1a398b97 NB |
2048 | spin_unlock_irq(&cmd->t_state_lock); |
2049 | return; | |
2050 | } | |
2051 | ||
dff0ca9e | 2052 | __target_execute_cmd(cmd, true); |
c66ac9db | 2053 | } |
70baf0ab | 2054 | EXPORT_SYMBOL(target_execute_cmd); |
c66ac9db | 2055 | |
5f41a31d CH |
2056 | /* |
2057 | * Process all commands up to the last received ORDERED task attribute which | |
2058 | * requires another blocking boundary | |
2059 | */ | |
2060 | static void target_restart_delayed_cmds(struct se_device *dev) | |
2061 | { | |
2062 | for (;;) { | |
2063 | struct se_cmd *cmd; | |
2064 | ||
2065 | spin_lock(&dev->delayed_cmd_lock); | |
2066 | if (list_empty(&dev->delayed_cmd_list)) { | |
2067 | spin_unlock(&dev->delayed_cmd_lock); | |
2068 | break; | |
2069 | } | |
2070 | ||
2071 | cmd = list_entry(dev->delayed_cmd_list.next, | |
2072 | struct se_cmd, se_delayed_node); | |
2073 | list_del(&cmd->se_delayed_node); | |
2074 | spin_unlock(&dev->delayed_cmd_lock); | |
2075 | ||
1c79df1f NB |
2076 | cmd->transport_state |= CMD_T_SENT; |
2077 | ||
dff0ca9e | 2078 | __target_execute_cmd(cmd, true); |
5f41a31d | 2079 | |
68d81f40 | 2080 | if (cmd->sam_task_attr == TCM_ORDERED_TAG) |
5f41a31d CH |
2081 | break; |
2082 | } | |
2083 | } | |
2084 | ||
c66ac9db | 2085 | /* |
35e0e757 | 2086 | * Called from I/O completion to determine which dormant/delayed |
c66ac9db NB |
2087 | * and ordered cmds need to have their tasks added to the execution queue. |
2088 | */ | |
2089 | static void transport_complete_task_attr(struct se_cmd *cmd) | |
2090 | { | |
5951146d | 2091 | struct se_device *dev = cmd->se_dev; |
c66ac9db | 2092 | |
a3541703 | 2093 | if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH) |
019c4ca6 CH |
2094 | return; |
2095 | ||
410c29df NB |
2096 | if (!(cmd->se_cmd_flags & SCF_TASK_ATTR_SET)) |
2097 | goto restart; | |
2098 | ||
68d81f40 | 2099 | if (cmd->sam_task_attr == TCM_SIMPLE_TAG) { |
33940d09 | 2100 | atomic_dec_mb(&dev->simple_cmds); |
c66ac9db | 2101 | dev->dev_cur_ordered_id++; |
68d81f40 | 2102 | } else if (cmd->sam_task_attr == TCM_HEAD_TAG) { |
c66ac9db | 2103 | dev->dev_cur_ordered_id++; |
9c31820b RD |
2104 | pr_debug("Incremented dev_cur_ordered_id: %u for HEAD_OF_QUEUE\n", |
2105 | dev->dev_cur_ordered_id); | |
68d81f40 | 2106 | } else if (cmd->sam_task_attr == TCM_ORDERED_TAG) { |
33940d09 | 2107 | atomic_dec_mb(&dev->dev_ordered_sync); |
c66ac9db NB |
2108 | |
2109 | dev->dev_cur_ordered_id++; | |
9c31820b RD |
2110 | pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED\n", |
2111 | dev->dev_cur_ordered_id); | |
c66ac9db | 2112 | } |
1c79df1f NB |
2113 | cmd->se_cmd_flags &= ~SCF_TASK_ATTR_SET; |
2114 | ||
410c29df | 2115 | restart: |
5f41a31d | 2116 | target_restart_delayed_cmds(dev); |
c66ac9db NB |
2117 | } |
2118 | ||
e057f533 | 2119 | static void transport_complete_qf(struct se_cmd *cmd) |
07bde79a NB |
2120 | { |
2121 | int ret = 0; | |
2122 | ||
019c4ca6 | 2123 | transport_complete_task_attr(cmd); |
fa7e25cf NB |
2124 | /* |
2125 | * If a fabric driver ->write_pending() or ->queue_data_in() callback | |
2126 | * has returned neither -ENOMEM or -EAGAIN, assume it's fatal and | |
2127 | * the same callbacks should not be retried. Return CHECK_CONDITION | |
2128 | * if a scsi_status is not already set. | |
2129 | * | |
2130 | * If a fabric driver ->queue_status() has returned non zero, always | |
2131 | * keep retrying no matter what.. | |
2132 | */ | |
2133 | if (cmd->t_state == TRANSPORT_COMPLETE_QF_ERR) { | |
2134 | if (cmd->scsi_status) | |
2135 | goto queue_status; | |
e057f533 | 2136 | |
fa7e25cf NB |
2137 | translate_sense_reason(cmd, TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE); |
2138 | goto queue_status; | |
e057f533 | 2139 | } |
07bde79a | 2140 | |
bd813720 LD |
2141 | /* |
2142 | * Check if we need to send a sense buffer from | |
2143 | * the struct se_cmd in question. We do NOT want | |
2144 | * to take this path of the IO has been marked as | |
2145 | * needing to be treated like a "normal read". This | |
2146 | * is the case if it's a tape read, and either the | |
2147 | * FM, EOM, or ILI bits are set, but there is no | |
2148 | * sense data. | |
2149 | */ | |
2150 | if (!(cmd->se_cmd_flags & SCF_TREAT_READ_AS_NORMAL) && | |
2151 | cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) | |
fa7e25cf NB |
2152 | goto queue_status; |
2153 | ||
07bde79a NB |
2154 | switch (cmd->data_direction) { |
2155 | case DMA_FROM_DEVICE: | |
bd813720 LD |
2156 | /* queue status if not treating this as a normal read */ |
2157 | if (cmd->scsi_status && | |
2158 | !(cmd->se_cmd_flags & SCF_TREAT_READ_AS_NORMAL)) | |
4347ab5a NB |
2159 | goto queue_status; |
2160 | ||
e5c0d6ad | 2161 | trace_target_cmd_complete(cmd); |
07bde79a NB |
2162 | ret = cmd->se_tfo->queue_data_in(cmd); |
2163 | break; | |
2164 | case DMA_TO_DEVICE: | |
64577407 | 2165 | if (cmd->se_cmd_flags & SCF_BIDI) { |
07bde79a | 2166 | ret = cmd->se_tfo->queue_data_in(cmd); |
63509c60 | 2167 | break; |
07bde79a | 2168 | } |
d7e595dd | 2169 | /* fall through */ |
07bde79a | 2170 | case DMA_NONE: |
4347ab5a | 2171 | queue_status: |
e5c0d6ad | 2172 | trace_target_cmd_complete(cmd); |
07bde79a NB |
2173 | ret = cmd->se_tfo->queue_status(cmd); |
2174 | break; | |
2175 | default: | |
2176 | break; | |
2177 | } | |
2178 | ||
e057f533 | 2179 | if (ret < 0) { |
fa7e25cf | 2180 | transport_handle_queue_full(cmd, cmd->se_dev, ret, false); |
e057f533 CH |
2181 | return; |
2182 | } | |
e057f533 | 2183 | transport_cmd_check_stop_to_fabric(cmd); |
07bde79a NB |
2184 | } |
2185 | ||
fa7e25cf NB |
2186 | static void transport_handle_queue_full(struct se_cmd *cmd, struct se_device *dev, |
2187 | int err, bool write_pending) | |
07bde79a | 2188 | { |
fa7e25cf NB |
2189 | /* |
2190 | * -EAGAIN or -ENOMEM signals retry of ->write_pending() and/or | |
2191 | * ->queue_data_in() callbacks from new process context. | |
2192 | * | |
2193 | * Otherwise for other errors, transport_complete_qf() will send | |
2194 | * CHECK_CONDITION via ->queue_status() instead of attempting to | |
2195 | * retry associated fabric driver data-transfer callbacks. | |
2196 | */ | |
2197 | if (err == -EAGAIN || err == -ENOMEM) { | |
2198 | cmd->t_state = (write_pending) ? TRANSPORT_COMPLETE_QF_WP : | |
2199 | TRANSPORT_COMPLETE_QF_OK; | |
2200 | } else { | |
2201 | pr_warn_ratelimited("Got unknown fabric queue status: %d\n", err); | |
2202 | cmd->t_state = TRANSPORT_COMPLETE_QF_ERR; | |
2203 | } | |
2204 | ||
07bde79a | 2205 | spin_lock_irq(&dev->qf_cmd_lock); |
07bde79a | 2206 | list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list); |
33940d09 | 2207 | atomic_inc_mb(&dev->dev_qf_count); |
07bde79a NB |
2208 | spin_unlock_irq(&cmd->se_dev->qf_cmd_lock); |
2209 | ||
2210 | schedule_work(&cmd->se_dev->qf_work_queue); | |
2211 | } | |
2212 | ||
fdeab852 | 2213 | static bool target_read_prot_action(struct se_cmd *cmd) |
bc005869 | 2214 | { |
fdeab852 NB |
2215 | switch (cmd->prot_op) { |
2216 | case TARGET_PROT_DIN_STRIP: | |
2217 | if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_STRIP)) { | |
f75b6fae SG |
2218 | u32 sectors = cmd->data_length >> |
2219 | ilog2(cmd->se_dev->dev_attrib.block_size); | |
2220 | ||
2221 | cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba, | |
2222 | sectors, 0, cmd->t_prot_sg, | |
2223 | 0); | |
2224 | if (cmd->pi_err) | |
fdeab852 | 2225 | return true; |
bc005869 | 2226 | } |
fdeab852 | 2227 | break; |
72c03850 NB |
2228 | case TARGET_PROT_DIN_INSERT: |
2229 | if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_INSERT) | |
2230 | break; | |
2231 | ||
2232 | sbc_dif_generate(cmd); | |
2233 | break; | |
fdeab852 NB |
2234 | default: |
2235 | break; | |
bc005869 NB |
2236 | } |
2237 | ||
2238 | return false; | |
2239 | } | |
2240 | ||
35e0e757 | 2241 | static void target_complete_ok_work(struct work_struct *work) |
c66ac9db | 2242 | { |
35e0e757 | 2243 | struct se_cmd *cmd = container_of(work, struct se_cmd, work); |
27a27099 | 2244 | int ret; |
35e0e757 | 2245 | |
c66ac9db NB |
2246 | /* |
2247 | * Check if we need to move delayed/dormant tasks from cmds on the | |
2248 | * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task | |
2249 | * Attribute. | |
2250 | */ | |
019c4ca6 CH |
2251 | transport_complete_task_attr(cmd); |
2252 | ||
07bde79a NB |
2253 | /* |
2254 | * Check to schedule QUEUE_FULL work, or execute an existing | |
2255 | * cmd->transport_qf_callback() | |
2256 | */ | |
2257 | if (atomic_read(&cmd->se_dev->dev_qf_count) != 0) | |
2258 | schedule_work(&cmd->se_dev->qf_work_queue); | |
2259 | ||
c66ac9db | 2260 | /* |
d5829eac | 2261 | * Check if we need to send a sense buffer from |
bd813720 LD |
2262 | * the struct se_cmd in question. We do NOT want |
2263 | * to take this path of the IO has been marked as | |
2264 | * needing to be treated like a "normal read". This | |
2265 | * is the case if it's a tape read, and either the | |
2266 | * FM, EOM, or ILI bits are set, but there is no | |
2267 | * sense data. | |
c66ac9db | 2268 | */ |
bd813720 LD |
2269 | if (!(cmd->se_cmd_flags & SCF_TREAT_READ_AS_NORMAL) && |
2270 | cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) { | |
27a27099 | 2271 | WARN_ON(!cmd->scsi_status); |
27a27099 PB |
2272 | ret = transport_send_check_condition_and_sense( |
2273 | cmd, 0, 1); | |
fa7e25cf | 2274 | if (ret) |
27a27099 PB |
2275 | goto queue_full; |
2276 | ||
27a27099 PB |
2277 | transport_cmd_check_stop_to_fabric(cmd); |
2278 | return; | |
c66ac9db NB |
2279 | } |
2280 | /* | |
25985edc | 2281 | * Check for a callback, used by amongst other things |
a6b0133c | 2282 | * XDWRITE_READ_10 and COMPARE_AND_WRITE emulation. |
c66ac9db | 2283 | */ |
a6b0133c NB |
2284 | if (cmd->transport_complete_callback) { |
2285 | sense_reason_t rc; | |
057085e5 NB |
2286 | bool caw = (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE); |
2287 | bool zero_dl = !(cmd->data_length); | |
2288 | int post_ret = 0; | |
a6b0133c | 2289 | |
057085e5 NB |
2290 | rc = cmd->transport_complete_callback(cmd, true, &post_ret); |
2291 | if (!rc && !post_ret) { | |
2292 | if (caw && zero_dl) | |
c8e63985 NB |
2293 | goto queue_rsp; |
2294 | ||
a6b0133c | 2295 | return; |
a2890087 NB |
2296 | } else if (rc) { |
2297 | ret = transport_send_check_condition_and_sense(cmd, | |
2298 | rc, 0); | |
fa7e25cf | 2299 | if (ret) |
a2890087 | 2300 | goto queue_full; |
a6b0133c | 2301 | |
a2890087 NB |
2302 | transport_cmd_check_stop_to_fabric(cmd); |
2303 | return; | |
2304 | } | |
a6b0133c | 2305 | } |
c66ac9db | 2306 | |
c8e63985 | 2307 | queue_rsp: |
c66ac9db NB |
2308 | switch (cmd->data_direction) { |
2309 | case DMA_FROM_DEVICE: | |
bd813720 LD |
2310 | /* |
2311 | * if this is a READ-type IO, but SCSI status | |
2312 | * is set, then skip returning data and just | |
2313 | * return the status -- unless this IO is marked | |
2314 | * as needing to be treated as a normal read, | |
2315 | * in which case we want to go ahead and return | |
2316 | * the data. This happens, for example, for tape | |
2317 | * reads with the FM, EOM, or ILI bits set, with | |
2318 | * no sense data. | |
2319 | */ | |
2320 | if (cmd->scsi_status && | |
2321 | !(cmd->se_cmd_flags & SCF_TREAT_READ_AS_NORMAL)) | |
4347ab5a NB |
2322 | goto queue_status; |
2323 | ||
4cc987ea NB |
2324 | atomic_long_add(cmd->data_length, |
2325 | &cmd->se_lun->lun_stats.tx_data_octets); | |
bc005869 NB |
2326 | /* |
2327 | * Perform READ_STRIP of PI using software emulation when | |
2328 | * backend had PI enabled, if the transport will not be | |
2329 | * performing hardware READ_STRIP offload. | |
2330 | */ | |
fdeab852 | 2331 | if (target_read_prot_action(cmd)) { |
bc005869 NB |
2332 | ret = transport_send_check_condition_and_sense(cmd, |
2333 | cmd->pi_err, 0); | |
fa7e25cf | 2334 | if (ret) |
bc005869 NB |
2335 | goto queue_full; |
2336 | ||
bc005869 NB |
2337 | transport_cmd_check_stop_to_fabric(cmd); |
2338 | return; | |
2339 | } | |
c66ac9db | 2340 | |
e5c0d6ad | 2341 | trace_target_cmd_complete(cmd); |
07bde79a | 2342 | ret = cmd->se_tfo->queue_data_in(cmd); |
fa7e25cf | 2343 | if (ret) |
07bde79a | 2344 | goto queue_full; |
c66ac9db NB |
2345 | break; |
2346 | case DMA_TO_DEVICE: | |
4cc987ea NB |
2347 | atomic_long_add(cmd->data_length, |
2348 | &cmd->se_lun->lun_stats.rx_data_octets); | |
c66ac9db NB |
2349 | /* |
2350 | * Check if we need to send READ payload for BIDI-COMMAND | |
2351 | */ | |
64577407 | 2352 | if (cmd->se_cmd_flags & SCF_BIDI) { |
4cc987ea NB |
2353 | atomic_long_add(cmd->data_length, |
2354 | &cmd->se_lun->lun_stats.tx_data_octets); | |
07bde79a | 2355 | ret = cmd->se_tfo->queue_data_in(cmd); |
fa7e25cf | 2356 | if (ret) |
07bde79a | 2357 | goto queue_full; |
c66ac9db NB |
2358 | break; |
2359 | } | |
d7e595dd | 2360 | /* fall through */ |
c66ac9db | 2361 | case DMA_NONE: |
4347ab5a | 2362 | queue_status: |
e5c0d6ad | 2363 | trace_target_cmd_complete(cmd); |
07bde79a | 2364 | ret = cmd->se_tfo->queue_status(cmd); |
fa7e25cf | 2365 | if (ret) |
07bde79a | 2366 | goto queue_full; |
c66ac9db NB |
2367 | break; |
2368 | default: | |
2369 | break; | |
2370 | } | |
2371 | ||
c66ac9db | 2372 | transport_cmd_check_stop_to_fabric(cmd); |
07bde79a NB |
2373 | return; |
2374 | ||
2375 | queue_full: | |
6708bb27 | 2376 | pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p," |
07bde79a | 2377 | " data_direction: %d\n", cmd, cmd->data_direction); |
fa7e25cf NB |
2378 | |
2379 | transport_handle_queue_full(cmd, cmd->se_dev, ret, false); | |
c66ac9db NB |
2380 | } |
2381 | ||
e64aa657 | 2382 | void target_free_sgl(struct scatterlist *sgl, int nents) |
c66ac9db | 2383 | { |
8c7a8d1c | 2384 | sgl_free_n_order(sgl, nents, 0); |
6708bb27 | 2385 | } |
e64aa657 | 2386 | EXPORT_SYMBOL(target_free_sgl); |
c66ac9db | 2387 | |
47e459e6 NB |
2388 | static inline void transport_reset_sgl_orig(struct se_cmd *cmd) |
2389 | { | |
2390 | /* | |
2391 | * Check for saved t_data_sg that may be used for COMPARE_AND_WRITE | |
2392 | * emulation, and free + reset pointers if necessary.. | |
2393 | */ | |
2394 | if (!cmd->t_data_sg_orig) | |
2395 | return; | |
2396 | ||
2397 | kfree(cmd->t_data_sg); | |
2398 | cmd->t_data_sg = cmd->t_data_sg_orig; | |
2399 | cmd->t_data_sg_orig = NULL; | |
2400 | cmd->t_data_nents = cmd->t_data_nents_orig; | |
2401 | cmd->t_data_nents_orig = 0; | |
2402 | } | |
2403 | ||
6708bb27 AG |
2404 | static inline void transport_free_pages(struct se_cmd *cmd) |
2405 | { | |
5835812f | 2406 | if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) { |
e64aa657 | 2407 | target_free_sgl(cmd->t_prot_sg, cmd->t_prot_nents); |
5835812f AM |
2408 | cmd->t_prot_sg = NULL; |
2409 | cmd->t_prot_nents = 0; | |
2410 | } | |
2411 | ||
47e459e6 | 2412 | if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) { |
c8e63985 NB |
2413 | /* |
2414 | * Release special case READ buffer payload required for | |
2415 | * SG_TO_MEM_NOALLOC to function with COMPARE_AND_WRITE | |
2416 | */ | |
2417 | if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) { | |
e64aa657 | 2418 | target_free_sgl(cmd->t_bidi_data_sg, |
c8e63985 NB |
2419 | cmd->t_bidi_data_nents); |
2420 | cmd->t_bidi_data_sg = NULL; | |
2421 | cmd->t_bidi_data_nents = 0; | |
2422 | } | |
47e459e6 | 2423 | transport_reset_sgl_orig(cmd); |
6708bb27 | 2424 | return; |
47e459e6 NB |
2425 | } |
2426 | transport_reset_sgl_orig(cmd); | |
6708bb27 | 2427 | |
e64aa657 | 2428 | target_free_sgl(cmd->t_data_sg, cmd->t_data_nents); |
ec98f782 AG |
2429 | cmd->t_data_sg = NULL; |
2430 | cmd->t_data_nents = 0; | |
c66ac9db | 2431 | |
e64aa657 | 2432 | target_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents); |
ec98f782 AG |
2433 | cmd->t_bidi_data_sg = NULL; |
2434 | cmd->t_bidi_data_nents = 0; | |
c66ac9db NB |
2435 | } |
2436 | ||
4949314c | 2437 | void *transport_kmap_data_sg(struct se_cmd *cmd) |
05d1c7c0 | 2438 | { |
ec98f782 | 2439 | struct scatterlist *sg = cmd->t_data_sg; |
4949314c AG |
2440 | struct page **pages; |
2441 | int i; | |
05d1c7c0 AG |
2442 | |
2443 | /* | |
ec98f782 AG |
2444 | * We need to take into account a possible offset here for fabrics like |
2445 | * tcm_loop who may be using a contig buffer from the SCSI midlayer for | |
2446 | * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd() | |
05d1c7c0 | 2447 | */ |
4949314c AG |
2448 | if (!cmd->t_data_nents) |
2449 | return NULL; | |
3717ef0c PB |
2450 | |
2451 | BUG_ON(!sg); | |
2452 | if (cmd->t_data_nents == 1) | |
4949314c AG |
2453 | return kmap(sg_page(sg)) + sg->offset; |
2454 | ||
2455 | /* >1 page. use vmap */ | |
df6751f3 | 2456 | pages = kmalloc_array(cmd->t_data_nents, sizeof(*pages), GFP_KERNEL); |
de103c93 | 2457 | if (!pages) |
4949314c AG |
2458 | return NULL; |
2459 | ||
2460 | /* convert sg[] to pages[] */ | |
2461 | for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) { | |
2462 | pages[i] = sg_page(sg); | |
2463 | } | |
2464 | ||
2465 | cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL); | |
2466 | kfree(pages); | |
de103c93 | 2467 | if (!cmd->t_data_vmap) |
4949314c AG |
2468 | return NULL; |
2469 | ||
2470 | return cmd->t_data_vmap + cmd->t_data_sg[0].offset; | |
05d1c7c0 | 2471 | } |
4949314c | 2472 | EXPORT_SYMBOL(transport_kmap_data_sg); |
05d1c7c0 | 2473 | |
4949314c | 2474 | void transport_kunmap_data_sg(struct se_cmd *cmd) |
05d1c7c0 | 2475 | { |
a1edf9cf | 2476 | if (!cmd->t_data_nents) { |
4949314c | 2477 | return; |
a1edf9cf | 2478 | } else if (cmd->t_data_nents == 1) { |
4949314c | 2479 | kunmap(sg_page(cmd->t_data_sg)); |
a1edf9cf AG |
2480 | return; |
2481 | } | |
4949314c AG |
2482 | |
2483 | vunmap(cmd->t_data_vmap); | |
2484 | cmd->t_data_vmap = NULL; | |
05d1c7c0 | 2485 | } |
4949314c | 2486 | EXPORT_SYMBOL(transport_kunmap_data_sg); |
05d1c7c0 | 2487 | |
c5ff8d6b | 2488 | int |
20093994 | 2489 | target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, u32 length, |
e64aa657 | 2490 | bool zero_page, bool chainable) |
c66ac9db | 2491 | { |
14db4917 | 2492 | gfp_t gfp = GFP_KERNEL | (zero_page ? __GFP_ZERO : 0); |
c66ac9db | 2493 | |
14db4917 BVA |
2494 | *sgl = sgl_alloc_order(length, 0, chainable, gfp, nents); |
2495 | return *sgl ? 0 : -ENOMEM; | |
c66ac9db | 2496 | } |
e64aa657 | 2497 | EXPORT_SYMBOL(target_alloc_sgl); |
c66ac9db | 2498 | |
da0f7619 | 2499 | /* |
b16a35b0 AG |
2500 | * Allocate any required resources to execute the command. For writes we |
2501 | * might not have the payload yet, so notify the fabric via a call to | |
2502 | * ->write_pending instead. Otherwise place it on the execution queue. | |
c66ac9db | 2503 | */ |
de103c93 CH |
2504 | sense_reason_t |
2505 | transport_generic_new_cmd(struct se_cmd *cmd) | |
c66ac9db | 2506 | { |
b1a2ecda | 2507 | unsigned long flags; |
c66ac9db | 2508 | int ret = 0; |
c8e63985 | 2509 | bool zero_flag = !(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB); |
c66ac9db | 2510 | |
5835812f AM |
2511 | if (cmd->prot_op != TARGET_PROT_NORMAL && |
2512 | !(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) { | |
2513 | ret = target_alloc_sgl(&cmd->t_prot_sg, &cmd->t_prot_nents, | |
e64aa657 | 2514 | cmd->prot_length, true, false); |
5835812f AM |
2515 | if (ret < 0) |
2516 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
2517 | } | |
2518 | ||
c66ac9db | 2519 | /* |
4240d448 | 2520 | * Determine if the TCM fabric module has already allocated physical |
c66ac9db | 2521 | * memory, and is directly calling transport_generic_map_mem_to_cmd() |
ec98f782 | 2522 | * beforehand. |
c66ac9db | 2523 | */ |
ec98f782 AG |
2524 | if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) && |
2525 | cmd->data_length) { | |
20093994 | 2526 | |
8cefe07b NB |
2527 | if ((cmd->se_cmd_flags & SCF_BIDI) || |
2528 | (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) { | |
2529 | u32 bidi_length; | |
2530 | ||
2531 | if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) | |
2532 | bidi_length = cmd->t_task_nolb * | |
2533 | cmd->se_dev->dev_attrib.block_size; | |
2534 | else | |
2535 | bidi_length = cmd->data_length; | |
2536 | ||
2537 | ret = target_alloc_sgl(&cmd->t_bidi_data_sg, | |
2538 | &cmd->t_bidi_data_nents, | |
e64aa657 | 2539 | bidi_length, zero_flag, false); |
8cefe07b NB |
2540 | if (ret < 0) |
2541 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
2542 | } | |
2543 | ||
20093994 | 2544 | ret = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents, |
e64aa657 | 2545 | cmd->data_length, zero_flag, false); |
c66ac9db | 2546 | if (ret < 0) |
de103c93 | 2547 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
c8e63985 NB |
2548 | } else if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) && |
2549 | cmd->data_length) { | |
2550 | /* | |
2551 | * Special case for COMPARE_AND_WRITE with fabrics | |
2552 | * using SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC. | |
2553 | */ | |
2554 | u32 caw_length = cmd->t_task_nolb * | |
2555 | cmd->se_dev->dev_attrib.block_size; | |
2556 | ||
2557 | ret = target_alloc_sgl(&cmd->t_bidi_data_sg, | |
2558 | &cmd->t_bidi_data_nents, | |
e64aa657 | 2559 | caw_length, zero_flag, false); |
c8e63985 NB |
2560 | if (ret < 0) |
2561 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
c66ac9db | 2562 | } |
c66ac9db | 2563 | /* |
c3196f0c CH |
2564 | * If this command is not a write we can execute it right here, |
2565 | * for write buffers we need to notify the fabric driver first | |
2566 | * and let it call back once the write buffers are ready. | |
c66ac9db | 2567 | */ |
5f41a31d | 2568 | target_add_to_state_list(cmd); |
885e7b0e | 2569 | if (cmd->data_direction != DMA_TO_DEVICE || cmd->data_length == 0) { |
c3196f0c CH |
2570 | target_execute_cmd(cmd); |
2571 | return 0; | |
2572 | } | |
b1a2ecda BVA |
2573 | |
2574 | spin_lock_irqsave(&cmd->t_state_lock, flags); | |
2575 | cmd->t_state = TRANSPORT_WRITE_PENDING; | |
2576 | /* | |
2577 | * Determine if frontend context caller is requesting the stopping of | |
2578 | * this command for frontend exceptions. | |
2579 | */ | |
fbbd4923 BVA |
2580 | if (cmd->transport_state & CMD_T_STOP && |
2581 | !cmd->se_tfo->write_pending_must_be_called) { | |
b1a2ecda BVA |
2582 | pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n", |
2583 | __func__, __LINE__, cmd->tag); | |
2584 | ||
2585 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
2586 | ||
2587 | complete_all(&cmd->t_transport_stop_comp); | |
a5eb307f | 2588 | return 0; |
b1a2ecda BVA |
2589 | } |
2590 | cmd->transport_state &= ~CMD_T_ACTIVE; | |
2591 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
c3196f0c CH |
2592 | |
2593 | ret = cmd->se_tfo->write_pending(cmd); | |
fa7e25cf | 2594 | if (ret) |
c3196f0c CH |
2595 | goto queue_full; |
2596 | ||
fa7e25cf | 2597 | return 0; |
da0f7619 | 2598 | |
c3196f0c CH |
2599 | queue_full: |
2600 | pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd); | |
fa7e25cf | 2601 | transport_handle_queue_full(cmd, cmd->se_dev, ret, true); |
c3196f0c | 2602 | return 0; |
c66ac9db | 2603 | } |
a1d8b49a | 2604 | EXPORT_SYMBOL(transport_generic_new_cmd); |
c66ac9db | 2605 | |
e057f533 | 2606 | static void transport_write_pending_qf(struct se_cmd *cmd) |
07bde79a | 2607 | { |
9574a497 | 2608 | unsigned long flags; |
f147abb4 | 2609 | int ret; |
9574a497 NB |
2610 | bool stop; |
2611 | ||
2612 | spin_lock_irqsave(&cmd->t_state_lock, flags); | |
2613 | stop = (cmd->transport_state & (CMD_T_STOP | CMD_T_ABORTED)); | |
2614 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
2615 | ||
2616 | if (stop) { | |
2617 | pr_debug("%s:%d CMD_T_STOP|CMD_T_ABORTED for ITT: 0x%08llx\n", | |
2618 | __func__, __LINE__, cmd->tag); | |
2619 | complete_all(&cmd->t_transport_stop_comp); | |
2620 | return; | |
2621 | } | |
f147abb4 NB |
2622 | |
2623 | ret = cmd->se_tfo->write_pending(cmd); | |
fa7e25cf | 2624 | if (ret) { |
e057f533 CH |
2625 | pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", |
2626 | cmd); | |
fa7e25cf | 2627 | transport_handle_queue_full(cmd, cmd->se_dev, ret, true); |
e057f533 | 2628 | } |
07bde79a NB |
2629 | } |
2630 | ||
0f4a9431 NB |
2631 | static bool |
2632 | __transport_wait_for_tasks(struct se_cmd *, bool, bool *, bool *, | |
2633 | unsigned long *flags); | |
2634 | ||
2635 | static void target_wait_free_cmd(struct se_cmd *cmd, bool *aborted, bool *tas) | |
2636 | { | |
2637 | unsigned long flags; | |
2638 | ||
2639 | spin_lock_irqsave(&cmd->t_state_lock, flags); | |
2640 | __transport_wait_for_tasks(cmd, true, aborted, tas, &flags); | |
2641 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
2642 | } | |
2643 | ||
2c9fa49e BVA |
2644 | /* |
2645 | * Call target_put_sess_cmd() and wait until target_release_cmd_kref(@cmd) has | |
2646 | * finished. | |
2647 | */ | |
2648 | void target_put_cmd_and_wait(struct se_cmd *cmd) | |
2649 | { | |
2650 | DECLARE_COMPLETION_ONSTACK(compl); | |
2651 | ||
2652 | WARN_ON_ONCE(cmd->abrt_compl); | |
2653 | cmd->abrt_compl = &compl; | |
2654 | target_put_sess_cmd(cmd); | |
2655 | wait_for_completion(&compl); | |
2656 | } | |
2657 | ||
953bcf7a BVA |
2658 | /* |
2659 | * This function is called by frontend drivers after processing of a command | |
2660 | * has finished. | |
2661 | * | |
2c9fa49e BVA |
2662 | * The protocol for ensuring that either the regular frontend command |
2663 | * processing flow or target_handle_abort() code drops one reference is as | |
2664 | * follows: | |
953bcf7a | 2665 | * - Calling .queue_data_in(), .queue_status() or queue_tm_rsp() will cause |
2c9fa49e BVA |
2666 | * the frontend driver to call this function synchronously or asynchronously. |
2667 | * That will cause one reference to be dropped. | |
953bcf7a BVA |
2668 | * - During regular command processing the target core sets CMD_T_COMPLETE |
2669 | * before invoking one of the .queue_*() functions. | |
2670 | * - The code that aborts commands skips commands and TMFs for which | |
2671 | * CMD_T_COMPLETE has been set. | |
2672 | * - CMD_T_ABORTED is set atomically after the CMD_T_COMPLETE check for | |
2673 | * commands that will be aborted. | |
2674 | * - If the CMD_T_ABORTED flag is set but CMD_T_TAS has not been set | |
2675 | * transport_generic_free_cmd() skips its call to target_put_sess_cmd(). | |
2676 | * - For aborted commands for which CMD_T_TAS has been set .queue_status() will | |
2677 | * be called and will drop a reference. | |
2678 | * - For aborted commands for which CMD_T_TAS has not been set .aborted_task() | |
2c9fa49e | 2679 | * will be called. target_handle_abort() will drop the final reference. |
953bcf7a | 2680 | */ |
d5ddad41 | 2681 | int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks) |
c66ac9db | 2682 | { |
7b2cc7dc | 2683 | DECLARE_COMPLETION_ONSTACK(compl); |
d5ddad41 | 2684 | int ret = 0; |
0f4a9431 | 2685 | bool aborted = false, tas = false; |
d5ddad41 | 2686 | |
edf46eee BVA |
2687 | if (wait_for_tasks) |
2688 | target_wait_free_cmd(cmd, &aborted, &tas); | |
2689 | ||
2690 | if (cmd->se_cmd_flags & SCF_SE_LUN_CMD) { | |
c130480b NB |
2691 | /* |
2692 | * Handle WRITE failure case where transport_generic_new_cmd() | |
2693 | * has already added se_cmd to state_list, but fabric has | |
2694 | * failed command before I/O submission. | |
2695 | */ | |
febe562c | 2696 | if (cmd->state_active) |
c130480b | 2697 | target_remove_from_state_list(cmd); |
0f4a9431 | 2698 | } |
7b2cc7dc | 2699 | if (aborted) |
a014c364 | 2700 | cmd->free_compl = &compl; |
2c9fa49e | 2701 | ret = target_put_sess_cmd(cmd); |
0f4a9431 NB |
2702 | if (aborted) { |
2703 | pr_debug("Detected CMD_T_ABORTED for ITT: %llu\n", cmd->tag); | |
7b2cc7dc | 2704 | wait_for_completion(&compl); |
0f4a9431 | 2705 | ret = 1; |
c66ac9db | 2706 | } |
d5ddad41 | 2707 | return ret; |
c66ac9db NB |
2708 | } |
2709 | EXPORT_SYMBOL(transport_generic_free_cmd); | |
2710 | ||
9ad97b8b RD |
2711 | /** |
2712 | * target_get_sess_cmd - Add command to active ->sess_cmd_list | |
a17f091d | 2713 | * @se_cmd: command descriptor to add |
a6360785 | 2714 | * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd() |
a17f091d | 2715 | */ |
afc16604 | 2716 | int target_get_sess_cmd(struct se_cmd *se_cmd, bool ack_kref) |
a17f091d | 2717 | { |
afc16604 | 2718 | struct se_session *se_sess = se_cmd->se_sess; |
a17f091d | 2719 | unsigned long flags; |
bc187ea6 | 2720 | int ret = 0; |
a17f091d | 2721 | |
a6360785 NB |
2722 | /* |
2723 | * Add a second kref if the fabric caller is expecting to handle | |
2724 | * fabric acknowledgement that requires two target_put_sess_cmd() | |
2725 | * invocations before se_cmd descriptor release. | |
2726 | */ | |
527268df | 2727 | if (ack_kref) { |
1b4c59b7 HR |
2728 | if (!kref_get_unless_zero(&se_cmd->cmd_kref)) |
2729 | return -EINVAL; | |
2730 | ||
527268df NB |
2731 | se_cmd->se_cmd_flags |= SCF_ACK_KREF; |
2732 | } | |
7481deb4 | 2733 | |
a17f091d | 2734 | spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); |
bc187ea6 RD |
2735 | if (se_sess->sess_tearing_down) { |
2736 | ret = -ESHUTDOWN; | |
2737 | goto out; | |
2738 | } | |
a17f091d | 2739 | list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list); |
ad669505 | 2740 | percpu_ref_get(&se_sess->cmd_count); |
bc187ea6 | 2741 | out: |
a17f091d | 2742 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); |
7544e597 BVA |
2743 | |
2744 | if (ret && ack_kref) | |
afc16604 | 2745 | target_put_sess_cmd(se_cmd); |
7544e597 | 2746 | |
bc187ea6 | 2747 | return ret; |
a17f091d | 2748 | } |
20361e69 | 2749 | EXPORT_SYMBOL(target_get_sess_cmd); |
a17f091d | 2750 | |
febe562c NB |
2751 | static void target_free_cmd_mem(struct se_cmd *cmd) |
2752 | { | |
2753 | transport_free_pages(cmd); | |
2754 | ||
2755 | if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB) | |
2756 | core_tmr_release_req(cmd->se_tmr_req); | |
2757 | if (cmd->t_task_cdb != cmd->__t_task_cdb) | |
2758 | kfree(cmd->t_task_cdb); | |
2759 | } | |
2760 | ||
7481deb4 | 2761 | static void target_release_cmd_kref(struct kref *kref) |
a17f091d | 2762 | { |
7481deb4 NB |
2763 | struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref); |
2764 | struct se_session *se_sess = se_cmd->se_sess; | |
a014c364 BVA |
2765 | struct completion *free_compl = se_cmd->free_compl; |
2766 | struct completion *abrt_compl = se_cmd->abrt_compl; | |
9ff9d15e | 2767 | unsigned long flags; |
a17f091d | 2768 | |
83f85b8e BVA |
2769 | if (se_cmd->lun_ref_active) |
2770 | percpu_ref_put(&se_cmd->se_lun->lun_ref); | |
2771 | ||
6b6427b6 BVA |
2772 | if (se_sess) { |
2773 | spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); | |
3eeff198 | 2774 | list_del_init(&se_cmd->se_cmd_list); |
9ff9d15e | 2775 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); |
a17f091d | 2776 | } |
a17f091d | 2777 | |
febe562c | 2778 | target_free_cmd_mem(se_cmd); |
7481deb4 | 2779 | se_cmd->se_tfo->release_cmd(se_cmd); |
a014c364 BVA |
2780 | if (free_compl) |
2781 | complete(free_compl); | |
2782 | if (abrt_compl) | |
2783 | complete(abrt_compl); | |
ad669505 BVA |
2784 | |
2785 | percpu_ref_put(&se_sess->cmd_count); | |
7481deb4 NB |
2786 | } |
2787 | ||
6b6427b6 BVA |
2788 | /** |
2789 | * target_put_sess_cmd - decrease the command reference count | |
2790 | * @se_cmd: command to drop a reference from | |
2791 | * | |
2792 | * Returns 1 if and only if this target_put_sess_cmd() call caused the | |
2793 | * refcount to drop to zero. Returns zero otherwise. | |
7481deb4 | 2794 | */ |
afc16604 | 2795 | int target_put_sess_cmd(struct se_cmd *se_cmd) |
7481deb4 | 2796 | { |
9ff9d15e | 2797 | return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref); |
a17f091d NB |
2798 | } |
2799 | EXPORT_SYMBOL(target_put_sess_cmd); | |
2800 | ||
c00e6220 BVA |
2801 | static const char *data_dir_name(enum dma_data_direction d) |
2802 | { | |
2803 | switch (d) { | |
2804 | case DMA_BIDIRECTIONAL: return "BIDI"; | |
2805 | case DMA_TO_DEVICE: return "WRITE"; | |
2806 | case DMA_FROM_DEVICE: return "READ"; | |
2807 | case DMA_NONE: return "NONE"; | |
2808 | } | |
2809 | ||
2810 | return "(?)"; | |
2811 | } | |
2812 | ||
2813 | static const char *cmd_state_name(enum transport_state_table t) | |
2814 | { | |
2815 | switch (t) { | |
2816 | case TRANSPORT_NO_STATE: return "NO_STATE"; | |
2817 | case TRANSPORT_NEW_CMD: return "NEW_CMD"; | |
2818 | case TRANSPORT_WRITE_PENDING: return "WRITE_PENDING"; | |
2819 | case TRANSPORT_PROCESSING: return "PROCESSING"; | |
2820 | case TRANSPORT_COMPLETE: return "COMPLETE"; | |
2821 | case TRANSPORT_ISTATE_PROCESSING: | |
2822 | return "ISTATE_PROCESSING"; | |
2823 | case TRANSPORT_COMPLETE_QF_WP: return "COMPLETE_QF_WP"; | |
2824 | case TRANSPORT_COMPLETE_QF_OK: return "COMPLETE_QF_OK"; | |
2825 | case TRANSPORT_COMPLETE_QF_ERR: return "COMPLETE_QF_ERR"; | |
2826 | } | |
2827 | ||
2828 | return "(?)"; | |
2829 | } | |
2830 | ||
2831 | static void target_append_str(char **str, const char *txt) | |
2832 | { | |
2833 | char *prev = *str; | |
2834 | ||
2835 | *str = *str ? kasprintf(GFP_ATOMIC, "%s,%s", *str, txt) : | |
2836 | kstrdup(txt, GFP_ATOMIC); | |
2837 | kfree(prev); | |
2838 | } | |
2839 | ||
2840 | /* | |
2841 | * Convert a transport state bitmask into a string. The caller is | |
2842 | * responsible for freeing the returned pointer. | |
2843 | */ | |
2844 | static char *target_ts_to_str(u32 ts) | |
2845 | { | |
2846 | char *str = NULL; | |
2847 | ||
2848 | if (ts & CMD_T_ABORTED) | |
2849 | target_append_str(&str, "aborted"); | |
2850 | if (ts & CMD_T_ACTIVE) | |
2851 | target_append_str(&str, "active"); | |
2852 | if (ts & CMD_T_COMPLETE) | |
2853 | target_append_str(&str, "complete"); | |
2854 | if (ts & CMD_T_SENT) | |
2855 | target_append_str(&str, "sent"); | |
2856 | if (ts & CMD_T_STOP) | |
2857 | target_append_str(&str, "stop"); | |
2858 | if (ts & CMD_T_FABRIC_STOP) | |
2859 | target_append_str(&str, "fabric_stop"); | |
2860 | ||
2861 | return str; | |
2862 | } | |
2863 | ||
2864 | static const char *target_tmf_name(enum tcm_tmreq_table tmf) | |
2865 | { | |
2866 | switch (tmf) { | |
2867 | case TMR_ABORT_TASK: return "ABORT_TASK"; | |
2868 | case TMR_ABORT_TASK_SET: return "ABORT_TASK_SET"; | |
2869 | case TMR_CLEAR_ACA: return "CLEAR_ACA"; | |
2870 | case TMR_CLEAR_TASK_SET: return "CLEAR_TASK_SET"; | |
2871 | case TMR_LUN_RESET: return "LUN_RESET"; | |
2872 | case TMR_TARGET_WARM_RESET: return "TARGET_WARM_RESET"; | |
2873 | case TMR_TARGET_COLD_RESET: return "TARGET_COLD_RESET"; | |
2874 | case TMR_UNKNOWN: break; | |
2875 | } | |
2876 | return "(?)"; | |
2877 | } | |
2878 | ||
2879 | void target_show_cmd(const char *pfx, struct se_cmd *cmd) | |
2880 | { | |
2881 | char *ts_str = target_ts_to_str(cmd->transport_state); | |
2882 | const u8 *cdb = cmd->t_task_cdb; | |
2883 | struct se_tmr_req *tmf = cmd->se_tmr_req; | |
2884 | ||
2885 | if (!(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) { | |
2886 | pr_debug("%scmd %#02x:%#02x with tag %#llx dir %s i_state %d t_state %s len %d refcnt %d transport_state %s\n", | |
2887 | pfx, cdb[0], cdb[1], cmd->tag, | |
2888 | data_dir_name(cmd->data_direction), | |
2889 | cmd->se_tfo->get_cmd_state(cmd), | |
2890 | cmd_state_name(cmd->t_state), cmd->data_length, | |
2891 | kref_read(&cmd->cmd_kref), ts_str); | |
2892 | } else { | |
2893 | pr_debug("%stmf %s with tag %#llx ref_task_tag %#llx i_state %d t_state %s refcnt %d transport_state %s\n", | |
2894 | pfx, target_tmf_name(tmf->function), cmd->tag, | |
2895 | tmf->ref_task_tag, cmd->se_tfo->get_cmd_state(cmd), | |
2896 | cmd_state_name(cmd->t_state), | |
2897 | kref_read(&cmd->cmd_kref), ts_str); | |
2898 | } | |
2899 | kfree(ts_str); | |
2900 | } | |
2901 | EXPORT_SYMBOL(target_show_cmd); | |
2902 | ||
9ad97b8b | 2903 | /** |
00d909a1 | 2904 | * target_sess_cmd_list_set_waiting - Set sess_tearing_down so no new commands are queued. |
1c7b13fe | 2905 | * @se_sess: session to flag |
a17f091d | 2906 | */ |
1c7b13fe | 2907 | void target_sess_cmd_list_set_waiting(struct se_session *se_sess) |
a17f091d | 2908 | { |
a17f091d NB |
2909 | unsigned long flags; |
2910 | ||
a17f091d | 2911 | spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); |
1c7b13fe | 2912 | se_sess->sess_tearing_down = 1; |
a17f091d | 2913 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); |
ad669505 BVA |
2914 | |
2915 | percpu_ref_kill(&se_sess->cmd_count); | |
a17f091d | 2916 | } |
1c7b13fe | 2917 | EXPORT_SYMBOL(target_sess_cmd_list_set_waiting); |
a17f091d | 2918 | |
9ad97b8b | 2919 | /** |
00d909a1 | 2920 | * target_wait_for_sess_cmds - Wait for outstanding commands |
a17f091d | 2921 | * @se_sess: session to wait for active I/O |
a17f091d | 2922 | */ |
be646c2d | 2923 | void target_wait_for_sess_cmds(struct se_session *se_sess) |
a17f091d | 2924 | { |
00d909a1 BVA |
2925 | struct se_cmd *cmd; |
2926 | int ret; | |
9b31a328 | 2927 | |
00d909a1 BVA |
2928 | WARN_ON_ONCE(!se_sess->sess_tearing_down); |
2929 | ||
00d909a1 | 2930 | do { |
ad669505 BVA |
2931 | ret = wait_event_timeout(se_sess->cmd_list_wq, |
2932 | percpu_ref_is_zero(&se_sess->cmd_count), | |
2933 | 180 * HZ); | |
00d909a1 BVA |
2934 | list_for_each_entry(cmd, &se_sess->sess_cmd_list, se_cmd_list) |
2935 | target_show_cmd("session shutdown: still waiting for ", | |
2936 | cmd); | |
2937 | } while (ret <= 0); | |
a17f091d NB |
2938 | } |
2939 | EXPORT_SYMBOL(target_wait_for_sess_cmds); | |
2940 | ||
a95be384 BVA |
2941 | /* |
2942 | * Prevent that new percpu_ref_tryget_live() calls succeed and wait until | |
2943 | * all references to the LUN have been released. Called during LUN shutdown. | |
2944 | */ | |
b3eeea66 | 2945 | void transport_clear_lun_ref(struct se_lun *lun) |
c66ac9db | 2946 | { |
a95be384 | 2947 | percpu_ref_kill(&lun->lun_ref); |
bd4e2d29 | 2948 | wait_for_completion(&lun->lun_shutdown_comp); |
c66ac9db NB |
2949 | } |
2950 | ||
0f4a9431 NB |
2951 | static bool |
2952 | __transport_wait_for_tasks(struct se_cmd *cmd, bool fabric_stop, | |
2953 | bool *aborted, bool *tas, unsigned long *flags) | |
2954 | __releases(&cmd->t_state_lock) | |
2955 | __acquires(&cmd->t_state_lock) | |
c66ac9db | 2956 | { |
c66ac9db | 2957 | |
0f4a9431 NB |
2958 | assert_spin_locked(&cmd->t_state_lock); |
2959 | WARN_ON_ONCE(!irqs_disabled()); | |
2960 | ||
2961 | if (fabric_stop) | |
2962 | cmd->transport_state |= CMD_T_FABRIC_STOP; | |
2963 | ||
2964 | if (cmd->transport_state & CMD_T_ABORTED) | |
2965 | *aborted = true; | |
2966 | ||
2967 | if (cmd->transport_state & CMD_T_TAS) | |
2968 | *tas = true; | |
2969 | ||
c8e31f26 | 2970 | if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && |
0f4a9431 | 2971 | !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) |
a17f091d | 2972 | return false; |
cb4f4d3c | 2973 | |
c8e31f26 | 2974 | if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) && |
0f4a9431 | 2975 | !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) |
a17f091d | 2976 | return false; |
7d680f3b | 2977 | |
0f4a9431 NB |
2978 | if (!(cmd->transport_state & CMD_T_ACTIVE)) |
2979 | return false; | |
2980 | ||
2981 | if (fabric_stop && *aborted) | |
a17f091d | 2982 | return false; |
c66ac9db | 2983 | |
7d680f3b | 2984 | cmd->transport_state |= CMD_T_STOP; |
c66ac9db | 2985 | |
c00e6220 | 2986 | target_show_cmd("wait_for_tasks: Stopping ", cmd); |
c66ac9db | 2987 | |
0f4a9431 | 2988 | spin_unlock_irqrestore(&cmd->t_state_lock, *flags); |
c66ac9db | 2989 | |
c00e6220 BVA |
2990 | while (!wait_for_completion_timeout(&cmd->t_transport_stop_comp, |
2991 | 180 * HZ)) | |
2992 | target_show_cmd("wait for tasks: ", cmd); | |
c66ac9db | 2993 | |
0f4a9431 | 2994 | spin_lock_irqsave(&cmd->t_state_lock, *flags); |
7d680f3b | 2995 | cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP); |
c66ac9db | 2996 | |
0f4a9431 NB |
2997 | pr_debug("wait_for_tasks: Stopped wait_for_completion(&cmd->" |
2998 | "t_transport_stop_comp) for ITT: 0x%08llx\n", cmd->tag); | |
c66ac9db | 2999 | |
0f4a9431 NB |
3000 | return true; |
3001 | } | |
3002 | ||
3003 | /** | |
2d4760ee BVA |
3004 | * transport_wait_for_tasks - set CMD_T_STOP and wait for t_transport_stop_comp |
3005 | * @cmd: command to wait on | |
0f4a9431 NB |
3006 | */ |
3007 | bool transport_wait_for_tasks(struct se_cmd *cmd) | |
3008 | { | |
3009 | unsigned long flags; | |
3010 | bool ret, aborted = false, tas = false; | |
3011 | ||
3012 | spin_lock_irqsave(&cmd->t_state_lock, flags); | |
3013 | ret = __transport_wait_for_tasks(cmd, false, &aborted, &tas, &flags); | |
d14921d6 | 3014 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
a17f091d | 3015 | |
0f4a9431 | 3016 | return ret; |
c66ac9db | 3017 | } |
d14921d6 | 3018 | EXPORT_SYMBOL(transport_wait_for_tasks); |
c66ac9db | 3019 | |
ab78fef4 BVA |
3020 | struct sense_info { |
3021 | u8 key; | |
3022 | u8 asc; | |
3023 | u8 ascq; | |
3024 | bool add_sector_info; | |
3025 | }; | |
3026 | ||
3027 | static const struct sense_info sense_info_table[] = { | |
3028 | [TCM_NO_SENSE] = { | |
3029 | .key = NOT_READY | |
3030 | }, | |
3031 | [TCM_NON_EXISTENT_LUN] = { | |
3032 | .key = ILLEGAL_REQUEST, | |
3033 | .asc = 0x25 /* LOGICAL UNIT NOT SUPPORTED */ | |
3034 | }, | |
3035 | [TCM_UNSUPPORTED_SCSI_OPCODE] = { | |
3036 | .key = ILLEGAL_REQUEST, | |
3037 | .asc = 0x20, /* INVALID COMMAND OPERATION CODE */ | |
3038 | }, | |
3039 | [TCM_SECTOR_COUNT_TOO_MANY] = { | |
3040 | .key = ILLEGAL_REQUEST, | |
3041 | .asc = 0x20, /* INVALID COMMAND OPERATION CODE */ | |
3042 | }, | |
3043 | [TCM_UNKNOWN_MODE_PAGE] = { | |
3044 | .key = ILLEGAL_REQUEST, | |
3045 | .asc = 0x24, /* INVALID FIELD IN CDB */ | |
3046 | }, | |
3047 | [TCM_CHECK_CONDITION_ABORT_CMD] = { | |
3048 | .key = ABORTED_COMMAND, | |
3049 | .asc = 0x29, /* BUS DEVICE RESET FUNCTION OCCURRED */ | |
3050 | .ascq = 0x03, | |
3051 | }, | |
3052 | [TCM_INCORRECT_AMOUNT_OF_DATA] = { | |
3053 | .key = ABORTED_COMMAND, | |
3054 | .asc = 0x0c, /* WRITE ERROR */ | |
3055 | .ascq = 0x0d, /* NOT ENOUGH UNSOLICITED DATA */ | |
3056 | }, | |
3057 | [TCM_INVALID_CDB_FIELD] = { | |
3058 | .key = ILLEGAL_REQUEST, | |
3059 | .asc = 0x24, /* INVALID FIELD IN CDB */ | |
3060 | }, | |
3061 | [TCM_INVALID_PARAMETER_LIST] = { | |
3062 | .key = ILLEGAL_REQUEST, | |
3063 | .asc = 0x26, /* INVALID FIELD IN PARAMETER LIST */ | |
3064 | }, | |
e8642120 DD |
3065 | [TCM_TOO_MANY_TARGET_DESCS] = { |
3066 | .key = ILLEGAL_REQUEST, | |
3067 | .asc = 0x26, | |
3068 | .ascq = 0x06, /* TOO MANY TARGET DESCRIPTORS */ | |
3069 | }, | |
3070 | [TCM_UNSUPPORTED_TARGET_DESC_TYPE_CODE] = { | |
3071 | .key = ILLEGAL_REQUEST, | |
3072 | .asc = 0x26, | |
3073 | .ascq = 0x07, /* UNSUPPORTED TARGET DESCRIPTOR TYPE CODE */ | |
3074 | }, | |
3075 | [TCM_TOO_MANY_SEGMENT_DESCS] = { | |
3076 | .key = ILLEGAL_REQUEST, | |
3077 | .asc = 0x26, | |
3078 | .ascq = 0x08, /* TOO MANY SEGMENT DESCRIPTORS */ | |
3079 | }, | |
3080 | [TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE] = { | |
3081 | .key = ILLEGAL_REQUEST, | |
3082 | .asc = 0x26, | |
3083 | .ascq = 0x09, /* UNSUPPORTED SEGMENT DESCRIPTOR TYPE CODE */ | |
3084 | }, | |
ab78fef4 BVA |
3085 | [TCM_PARAMETER_LIST_LENGTH_ERROR] = { |
3086 | .key = ILLEGAL_REQUEST, | |
3087 | .asc = 0x1a, /* PARAMETER LIST LENGTH ERROR */ | |
3088 | }, | |
3089 | [TCM_UNEXPECTED_UNSOLICITED_DATA] = { | |
3090 | .key = ILLEGAL_REQUEST, | |
3091 | .asc = 0x0c, /* WRITE ERROR */ | |
3092 | .ascq = 0x0c, /* UNEXPECTED_UNSOLICITED_DATA */ | |
3093 | }, | |
3094 | [TCM_SERVICE_CRC_ERROR] = { | |
3095 | .key = ABORTED_COMMAND, | |
3096 | .asc = 0x47, /* PROTOCOL SERVICE CRC ERROR */ | |
3097 | .ascq = 0x05, /* N/A */ | |
3098 | }, | |
3099 | [TCM_SNACK_REJECTED] = { | |
3100 | .key = ABORTED_COMMAND, | |
3101 | .asc = 0x11, /* READ ERROR */ | |
3102 | .ascq = 0x13, /* FAILED RETRANSMISSION REQUEST */ | |
3103 | }, | |
3104 | [TCM_WRITE_PROTECTED] = { | |
3105 | .key = DATA_PROTECT, | |
3106 | .asc = 0x27, /* WRITE PROTECTED */ | |
3107 | }, | |
3108 | [TCM_ADDRESS_OUT_OF_RANGE] = { | |
3109 | .key = ILLEGAL_REQUEST, | |
3110 | .asc = 0x21, /* LOGICAL BLOCK ADDRESS OUT OF RANGE */ | |
3111 | }, | |
3112 | [TCM_CHECK_CONDITION_UNIT_ATTENTION] = { | |
3113 | .key = UNIT_ATTENTION, | |
3114 | }, | |
3115 | [TCM_CHECK_CONDITION_NOT_READY] = { | |
3116 | .key = NOT_READY, | |
3117 | }, | |
3118 | [TCM_MISCOMPARE_VERIFY] = { | |
3119 | .key = MISCOMPARE, | |
3120 | .asc = 0x1d, /* MISCOMPARE DURING VERIFY OPERATION */ | |
3121 | .ascq = 0x00, | |
3122 | }, | |
3123 | [TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED] = { | |
734ca5c4 | 3124 | .key = ABORTED_COMMAND, |
ab78fef4 BVA |
3125 | .asc = 0x10, |
3126 | .ascq = 0x01, /* LOGICAL BLOCK GUARD CHECK FAILED */ | |
3127 | .add_sector_info = true, | |
3128 | }, | |
3129 | [TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED] = { | |
734ca5c4 | 3130 | .key = ABORTED_COMMAND, |
ab78fef4 BVA |
3131 | .asc = 0x10, |
3132 | .ascq = 0x02, /* LOGICAL BLOCK APPLICATION TAG CHECK FAILED */ | |
3133 | .add_sector_info = true, | |
3134 | }, | |
3135 | [TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED] = { | |
734ca5c4 | 3136 | .key = ABORTED_COMMAND, |
ab78fef4 BVA |
3137 | .asc = 0x10, |
3138 | .ascq = 0x03, /* LOGICAL BLOCK REFERENCE TAG CHECK FAILED */ | |
3139 | .add_sector_info = true, | |
3140 | }, | |
449a1378 NB |
3141 | [TCM_COPY_TARGET_DEVICE_NOT_REACHABLE] = { |
3142 | .key = COPY_ABORTED, | |
3143 | .asc = 0x0d, | |
3144 | .ascq = 0x02, /* COPY TARGET DEVICE NOT REACHABLE */ | |
3145 | ||
3146 | }, | |
ab78fef4 BVA |
3147 | [TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE] = { |
3148 | /* | |
3149 | * Returning ILLEGAL REQUEST would cause immediate IO errors on | |
3150 | * Solaris initiators. Returning NOT READY instead means the | |
3151 | * operations will be retried a finite number of times and we | |
3152 | * can survive intermittent errors. | |
3153 | */ | |
3154 | .key = NOT_READY, | |
3155 | .asc = 0x08, /* LOGICAL UNIT COMMUNICATION FAILURE */ | |
3156 | }, | |
79dd6f2f | 3157 | [TCM_INSUFFICIENT_REGISTRATION_RESOURCES] = { |
3158 | /* | |
3159 | * From spc4r22 section5.7.7,5.7.8 | |
3160 | * If a PERSISTENT RESERVE OUT command with a REGISTER service action | |
3161 | * or a REGISTER AND IGNORE EXISTING KEY service action or | |
3162 | * REGISTER AND MOVE service actionis attempted, | |
3163 | * but there are insufficient device server resources to complete the | |
3164 | * operation, then the command shall be terminated with CHECK CONDITION | |
3165 | * status, with the sense key set to ILLEGAL REQUEST,and the additonal | |
3166 | * sense code set to INSUFFICIENT REGISTRATION RESOURCES. | |
3167 | */ | |
3168 | .key = ILLEGAL_REQUEST, | |
3169 | .asc = 0x55, | |
3170 | .ascq = 0x04, /* INSUFFICIENT REGISTRATION RESOURCES */ | |
3171 | }, | |
ab78fef4 BVA |
3172 | }; |
3173 | ||
325c1e8b BVA |
3174 | /** |
3175 | * translate_sense_reason - translate a sense reason into T10 key, asc and ascq | |
3176 | * @cmd: SCSI command in which the resulting sense buffer or SCSI status will | |
3177 | * be stored. | |
3178 | * @reason: LIO sense reason code. If this argument has the value | |
3179 | * TCM_CHECK_CONDITION_UNIT_ATTENTION, try to dequeue a unit attention. If | |
3180 | * dequeuing a unit attention fails due to multiple commands being processed | |
3181 | * concurrently, set the command status to BUSY. | |
3182 | * | |
3183 | * Return: 0 upon success or -EINVAL if the sense buffer is too small. | |
3184 | */ | |
17e391dd | 3185 | static void translate_sense_reason(struct se_cmd *cmd, sense_reason_t reason) |
ab78fef4 BVA |
3186 | { |
3187 | const struct sense_info *si; | |
3188 | u8 *buffer = cmd->sense_buffer; | |
3189 | int r = (__force int)reason; | |
325c1e8b | 3190 | u8 key, asc, ascq; |
4e4937e8 | 3191 | bool desc_format = target_sense_desc_format(cmd->se_dev); |
ab78fef4 BVA |
3192 | |
3193 | if (r < ARRAY_SIZE(sense_info_table) && sense_info_table[r].key) | |
3194 | si = &sense_info_table[r]; | |
3195 | else | |
3196 | si = &sense_info_table[(__force int) | |
3197 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE]; | |
3198 | ||
325c1e8b | 3199 | key = si->key; |
ab78fef4 | 3200 | if (reason == TCM_CHECK_CONDITION_UNIT_ATTENTION) { |
325c1e8b BVA |
3201 | if (!core_scsi3_ua_for_check_condition(cmd, &key, &asc, |
3202 | &ascq)) { | |
3203 | cmd->scsi_status = SAM_STAT_BUSY; | |
3204 | return; | |
3205 | } | |
ab78fef4 BVA |
3206 | } else if (si->asc == 0) { |
3207 | WARN_ON_ONCE(cmd->scsi_asc == 0); | |
3208 | asc = cmd->scsi_asc; | |
3209 | ascq = cmd->scsi_ascq; | |
3210 | } else { | |
3211 | asc = si->asc; | |
3212 | ascq = si->ascq; | |
3213 | } | |
9ec1e1ce | 3214 | |
89a104ed BVA |
3215 | cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE; |
3216 | cmd->scsi_status = SAM_STAT_CHECK_CONDITION; | |
3217 | cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER; | |
325c1e8b | 3218 | scsi_build_sense_buffer(desc_format, buffer, key, asc, ascq); |
ab78fef4 | 3219 | if (si->add_sector_info) |
17e391dd BVA |
3220 | WARN_ON_ONCE(scsi_set_sense_information(buffer, |
3221 | cmd->scsi_sense_length, | |
3222 | cmd->bad_sector) < 0); | |
ab78fef4 BVA |
3223 | } |
3224 | ||
de103c93 CH |
3225 | int |
3226 | transport_send_check_condition_and_sense(struct se_cmd *cmd, | |
3227 | sense_reason_t reason, int from_transport) | |
c66ac9db | 3228 | { |
c66ac9db | 3229 | unsigned long flags; |
c66ac9db | 3230 | |
2c9fa49e BVA |
3231 | WARN_ON_ONCE(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB); |
3232 | ||
a1d8b49a | 3233 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 3234 | if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) { |
a1d8b49a | 3235 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
3236 | return 0; |
3237 | } | |
3238 | cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION; | |
a1d8b49a | 3239 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 3240 | |
17e391dd BVA |
3241 | if (!from_transport) |
3242 | translate_sense_reason(cmd, reason); | |
c66ac9db | 3243 | |
e5c0d6ad | 3244 | trace_target_cmd_complete(cmd); |
07bde79a | 3245 | return cmd->se_tfo->queue_status(cmd); |
c66ac9db NB |
3246 | } |
3247 | EXPORT_SYMBOL(transport_send_check_condition_and_sense); | |
3248 | ||
94ebb471 BVA |
3249 | /** |
3250 | * target_send_busy - Send SCSI BUSY status back to the initiator | |
3251 | * @cmd: SCSI command for which to send a BUSY reply. | |
3252 | * | |
3253 | * Note: Only call this function if target_submit_cmd*() failed. | |
3254 | */ | |
3255 | int target_send_busy(struct se_cmd *cmd) | |
3256 | { | |
3257 | WARN_ON_ONCE(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB); | |
3258 | ||
3259 | cmd->scsi_status = SAM_STAT_BUSY; | |
3260 | trace_target_cmd_complete(cmd); | |
3261 | return cmd->se_tfo->queue_status(cmd); | |
3262 | } | |
3263 | EXPORT_SYMBOL(target_send_busy); | |
3264 | ||
af877292 | 3265 | static void target_tmr_work(struct work_struct *work) |
c66ac9db | 3266 | { |
af877292 | 3267 | struct se_cmd *cmd = container_of(work, struct se_cmd, work); |
5951146d | 3268 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
3269 | struct se_tmr_req *tmr = cmd->se_tmr_req; |
3270 | int ret; | |
3271 | ||
2c9fa49e BVA |
3272 | if (cmd->transport_state & CMD_T_ABORTED) |
3273 | goto aborted; | |
a6d9bb1c | 3274 | |
c66ac9db | 3275 | switch (tmr->function) { |
5c6cd613 | 3276 | case TMR_ABORT_TASK: |
3d28934a | 3277 | core_tmr_abort_task(dev, tmr, cmd->se_sess); |
c66ac9db | 3278 | break; |
5c6cd613 NB |
3279 | case TMR_ABORT_TASK_SET: |
3280 | case TMR_CLEAR_ACA: | |
3281 | case TMR_CLEAR_TASK_SET: | |
c66ac9db NB |
3282 | tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED; |
3283 | break; | |
5c6cd613 | 3284 | case TMR_LUN_RESET: |
c66ac9db NB |
3285 | ret = core_tmr_lun_reset(dev, tmr, NULL, NULL); |
3286 | tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE : | |
3287 | TMR_FUNCTION_REJECTED; | |
b5aafb16 HR |
3288 | if (tmr->response == TMR_FUNCTION_COMPLETE) { |
3289 | target_ua_allocate_lun(cmd->se_sess->se_node_acl, | |
3290 | cmd->orig_fe_lun, 0x29, | |
3291 | ASCQ_29H_BUS_DEVICE_RESET_FUNCTION_OCCURRED); | |
3292 | } | |
c66ac9db | 3293 | break; |
5c6cd613 | 3294 | case TMR_TARGET_WARM_RESET: |
c66ac9db NB |
3295 | tmr->response = TMR_FUNCTION_REJECTED; |
3296 | break; | |
5c6cd613 | 3297 | case TMR_TARGET_COLD_RESET: |
c66ac9db NB |
3298 | tmr->response = TMR_FUNCTION_REJECTED; |
3299 | break; | |
c66ac9db | 3300 | default: |
c1678280 | 3301 | pr_err("Unknown TMR function: 0x%02x.\n", |
c66ac9db NB |
3302 | tmr->function); |
3303 | tmr->response = TMR_FUNCTION_REJECTED; | |
3304 | break; | |
3305 | } | |
3306 | ||
2c9fa49e BVA |
3307 | if (cmd->transport_state & CMD_T_ABORTED) |
3308 | goto aborted; | |
a6d9bb1c | 3309 | |
e3d6f909 | 3310 | cmd->se_tfo->queue_tm_rsp(cmd); |
c66ac9db | 3311 | |
b7b8bef7 | 3312 | transport_cmd_check_stop_to_fabric(cmd); |
2c9fa49e BVA |
3313 | return; |
3314 | ||
3315 | aborted: | |
3316 | target_handle_abort(cmd); | |
c66ac9db NB |
3317 | } |
3318 | ||
af877292 CH |
3319 | int transport_generic_handle_tmr( |
3320 | struct se_cmd *cmd) | |
c66ac9db | 3321 | { |
f15e9cd9 | 3322 | unsigned long flags; |
c54eeffb | 3323 | bool aborted = false; |
f15e9cd9 NB |
3324 | |
3325 | spin_lock_irqsave(&cmd->t_state_lock, flags); | |
c54eeffb NB |
3326 | if (cmd->transport_state & CMD_T_ABORTED) { |
3327 | aborted = true; | |
3328 | } else { | |
3329 | cmd->t_state = TRANSPORT_ISTATE_PROCESSING; | |
3330 | cmd->transport_state |= CMD_T_ACTIVE; | |
3331 | } | |
f15e9cd9 NB |
3332 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
3333 | ||
c54eeffb | 3334 | if (aborted) { |
2c9fa49e BVA |
3335 | pr_warn_ratelimited("handle_tmr caught CMD_T_ABORTED TMR %d ref_tag: %llu tag: %llu\n", |
3336 | cmd->se_tmr_req->function, | |
3337 | cmd->se_tmr_req->ref_task_tag, cmd->tag); | |
3338 | target_handle_abort(cmd); | |
c54eeffb NB |
3339 | return 0; |
3340 | } | |
3341 | ||
af877292 | 3342 | INIT_WORK(&cmd->work, target_tmr_work); |
db5b21a2 | 3343 | schedule_work(&cmd->work); |
c66ac9db NB |
3344 | return 0; |
3345 | } | |
af877292 | 3346 | EXPORT_SYMBOL(transport_generic_handle_tmr); |
814e5b45 CH |
3347 | |
3348 | bool | |
3349 | target_check_wce(struct se_device *dev) | |
3350 | { | |
3351 | bool wce = false; | |
3352 | ||
3353 | if (dev->transport->get_write_cache) | |
3354 | wce = dev->transport->get_write_cache(dev); | |
3355 | else if (dev->dev_attrib.emulate_write_cache > 0) | |
3356 | wce = true; | |
3357 | ||
3358 | return wce; | |
3359 | } | |
3360 | ||
3361 | bool | |
3362 | target_check_fua(struct se_device *dev) | |
3363 | { | |
3364 | return target_check_wce(dev) && dev->dev_attrib.emulate_fua_write > 0; | |
3365 | } |