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Commit | Line | Data |
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c66ac9db NB |
1 | /******************************************************************************* |
2 | * Filename: target_core_transport.c | |
3 | * | |
4 | * This file contains the Generic Target Engine Core. | |
5 | * | |
4c76251e | 6 | * (c) Copyright 2002-2013 Datera, Inc. |
c66ac9db NB |
7 | * |
8 | * Nicholas A. Bellinger <nab@kernel.org> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
23 | * | |
24 | ******************************************************************************/ | |
25 | ||
c66ac9db NB |
26 | #include <linux/net.h> |
27 | #include <linux/delay.h> | |
28 | #include <linux/string.h> | |
29 | #include <linux/timer.h> | |
30 | #include <linux/slab.h> | |
c66ac9db | 31 | #include <linux/spinlock.h> |
c66ac9db NB |
32 | #include <linux/kthread.h> |
33 | #include <linux/in.h> | |
34 | #include <linux/cdrom.h> | |
827509e3 | 35 | #include <linux/module.h> |
015487b8 | 36 | #include <linux/ratelimit.h> |
5538d294 | 37 | #include <linux/vmalloc.h> |
c66ac9db NB |
38 | #include <asm/unaligned.h> |
39 | #include <net/sock.h> | |
40 | #include <net/tcp.h> | |
ba929992 | 41 | #include <scsi/scsi_proto.h> |
9ec1e1ce | 42 | #include <scsi/scsi_common.h> |
c66ac9db NB |
43 | |
44 | #include <target/target_core_base.h> | |
c4795fb2 CH |
45 | #include <target/target_core_backend.h> |
46 | #include <target/target_core_fabric.h> | |
c66ac9db | 47 | |
e26d99ae | 48 | #include "target_core_internal.h" |
c66ac9db | 49 | #include "target_core_alua.h" |
c66ac9db | 50 | #include "target_core_pr.h" |
c66ac9db NB |
51 | #include "target_core_ua.h" |
52 | ||
e5c0d6ad RD |
53 | #define CREATE_TRACE_POINTS |
54 | #include <trace/events/target.h> | |
55 | ||
35e0e757 | 56 | static struct workqueue_struct *target_completion_wq; |
c66ac9db | 57 | static struct kmem_cache *se_sess_cache; |
c66ac9db | 58 | struct kmem_cache *se_ua_cache; |
c66ac9db NB |
59 | struct kmem_cache *t10_pr_reg_cache; |
60 | struct kmem_cache *t10_alua_lu_gp_cache; | |
61 | struct kmem_cache *t10_alua_lu_gp_mem_cache; | |
62 | struct kmem_cache *t10_alua_tg_pt_gp_cache; | |
229d4f11 HR |
63 | struct kmem_cache *t10_alua_lba_map_cache; |
64 | struct kmem_cache *t10_alua_lba_map_mem_cache; | |
c66ac9db | 65 | |
c66ac9db | 66 | static void transport_complete_task_attr(struct se_cmd *cmd); |
07bde79a | 67 | static void transport_handle_queue_full(struct se_cmd *cmd, |
e057f533 | 68 | struct se_device *dev); |
d5ddad41 | 69 | static int transport_put_cmd(struct se_cmd *cmd); |
35e0e757 | 70 | static void target_complete_ok_work(struct work_struct *work); |
c66ac9db | 71 | |
e3d6f909 | 72 | int init_se_kmem_caches(void) |
c66ac9db | 73 | { |
c66ac9db NB |
74 | se_sess_cache = kmem_cache_create("se_sess_cache", |
75 | sizeof(struct se_session), __alignof__(struct se_session), | |
76 | 0, NULL); | |
6708bb27 AG |
77 | if (!se_sess_cache) { |
78 | pr_err("kmem_cache_create() for struct se_session" | |
c66ac9db | 79 | " failed\n"); |
c8e31f26 | 80 | goto out; |
c66ac9db NB |
81 | } |
82 | se_ua_cache = kmem_cache_create("se_ua_cache", | |
83 | sizeof(struct se_ua), __alignof__(struct se_ua), | |
84 | 0, NULL); | |
6708bb27 AG |
85 | if (!se_ua_cache) { |
86 | pr_err("kmem_cache_create() for struct se_ua failed\n"); | |
35e0e757 | 87 | goto out_free_sess_cache; |
c66ac9db | 88 | } |
c66ac9db NB |
89 | t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache", |
90 | sizeof(struct t10_pr_registration), | |
91 | __alignof__(struct t10_pr_registration), 0, NULL); | |
6708bb27 AG |
92 | if (!t10_pr_reg_cache) { |
93 | pr_err("kmem_cache_create() for struct t10_pr_registration" | |
c66ac9db | 94 | " failed\n"); |
35e0e757 | 95 | goto out_free_ua_cache; |
c66ac9db NB |
96 | } |
97 | t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache", | |
98 | sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp), | |
99 | 0, NULL); | |
6708bb27 AG |
100 | if (!t10_alua_lu_gp_cache) { |
101 | pr_err("kmem_cache_create() for t10_alua_lu_gp_cache" | |
c66ac9db | 102 | " failed\n"); |
35e0e757 | 103 | goto out_free_pr_reg_cache; |
c66ac9db NB |
104 | } |
105 | t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache", | |
106 | sizeof(struct t10_alua_lu_gp_member), | |
107 | __alignof__(struct t10_alua_lu_gp_member), 0, NULL); | |
6708bb27 AG |
108 | if (!t10_alua_lu_gp_mem_cache) { |
109 | pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_" | |
c66ac9db | 110 | "cache failed\n"); |
35e0e757 | 111 | goto out_free_lu_gp_cache; |
c66ac9db NB |
112 | } |
113 | t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache", | |
114 | sizeof(struct t10_alua_tg_pt_gp), | |
115 | __alignof__(struct t10_alua_tg_pt_gp), 0, NULL); | |
6708bb27 AG |
116 | if (!t10_alua_tg_pt_gp_cache) { |
117 | pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_" | |
c66ac9db | 118 | "cache failed\n"); |
35e0e757 | 119 | goto out_free_lu_gp_mem_cache; |
c66ac9db | 120 | } |
229d4f11 HR |
121 | t10_alua_lba_map_cache = kmem_cache_create( |
122 | "t10_alua_lba_map_cache", | |
123 | sizeof(struct t10_alua_lba_map), | |
124 | __alignof__(struct t10_alua_lba_map), 0, NULL); | |
125 | if (!t10_alua_lba_map_cache) { | |
126 | pr_err("kmem_cache_create() for t10_alua_lba_map_" | |
127 | "cache failed\n"); | |
adf653f9 | 128 | goto out_free_tg_pt_gp_cache; |
229d4f11 HR |
129 | } |
130 | t10_alua_lba_map_mem_cache = kmem_cache_create( | |
131 | "t10_alua_lba_map_mem_cache", | |
132 | sizeof(struct t10_alua_lba_map_member), | |
133 | __alignof__(struct t10_alua_lba_map_member), 0, NULL); | |
134 | if (!t10_alua_lba_map_mem_cache) { | |
135 | pr_err("kmem_cache_create() for t10_alua_lba_map_mem_" | |
136 | "cache failed\n"); | |
137 | goto out_free_lba_map_cache; | |
138 | } | |
c66ac9db | 139 | |
35e0e757 CH |
140 | target_completion_wq = alloc_workqueue("target_completion", |
141 | WQ_MEM_RECLAIM, 0); | |
142 | if (!target_completion_wq) | |
229d4f11 | 143 | goto out_free_lba_map_mem_cache; |
35e0e757 | 144 | |
c66ac9db | 145 | return 0; |
35e0e757 | 146 | |
229d4f11 HR |
147 | out_free_lba_map_mem_cache: |
148 | kmem_cache_destroy(t10_alua_lba_map_mem_cache); | |
149 | out_free_lba_map_cache: | |
150 | kmem_cache_destroy(t10_alua_lba_map_cache); | |
35e0e757 CH |
151 | out_free_tg_pt_gp_cache: |
152 | kmem_cache_destroy(t10_alua_tg_pt_gp_cache); | |
153 | out_free_lu_gp_mem_cache: | |
154 | kmem_cache_destroy(t10_alua_lu_gp_mem_cache); | |
155 | out_free_lu_gp_cache: | |
156 | kmem_cache_destroy(t10_alua_lu_gp_cache); | |
157 | out_free_pr_reg_cache: | |
158 | kmem_cache_destroy(t10_pr_reg_cache); | |
159 | out_free_ua_cache: | |
160 | kmem_cache_destroy(se_ua_cache); | |
161 | out_free_sess_cache: | |
162 | kmem_cache_destroy(se_sess_cache); | |
c66ac9db | 163 | out: |
e3d6f909 | 164 | return -ENOMEM; |
c66ac9db NB |
165 | } |
166 | ||
e3d6f909 | 167 | void release_se_kmem_caches(void) |
c66ac9db | 168 | { |
35e0e757 | 169 | destroy_workqueue(target_completion_wq); |
c66ac9db NB |
170 | kmem_cache_destroy(se_sess_cache); |
171 | kmem_cache_destroy(se_ua_cache); | |
c66ac9db NB |
172 | kmem_cache_destroy(t10_pr_reg_cache); |
173 | kmem_cache_destroy(t10_alua_lu_gp_cache); | |
174 | kmem_cache_destroy(t10_alua_lu_gp_mem_cache); | |
175 | kmem_cache_destroy(t10_alua_tg_pt_gp_cache); | |
229d4f11 HR |
176 | kmem_cache_destroy(t10_alua_lba_map_cache); |
177 | kmem_cache_destroy(t10_alua_lba_map_mem_cache); | |
c66ac9db NB |
178 | } |
179 | ||
e3d6f909 AG |
180 | /* This code ensures unique mib indexes are handed out. */ |
181 | static DEFINE_SPINLOCK(scsi_mib_index_lock); | |
182 | static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX]; | |
e89d15ee NB |
183 | |
184 | /* | |
185 | * Allocate a new row index for the entry type specified | |
186 | */ | |
187 | u32 scsi_get_new_index(scsi_index_t type) | |
188 | { | |
189 | u32 new_index; | |
190 | ||
e3d6f909 | 191 | BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX)); |
e89d15ee | 192 | |
e3d6f909 AG |
193 | spin_lock(&scsi_mib_index_lock); |
194 | new_index = ++scsi_mib_index[type]; | |
195 | spin_unlock(&scsi_mib_index_lock); | |
e89d15ee NB |
196 | |
197 | return new_index; | |
198 | } | |
199 | ||
dbc5623e | 200 | void transport_subsystem_check_init(void) |
c66ac9db NB |
201 | { |
202 | int ret; | |
283669d2 | 203 | static int sub_api_initialized; |
c66ac9db | 204 | |
dbc5623e NB |
205 | if (sub_api_initialized) |
206 | return; | |
207 | ||
c66ac9db NB |
208 | ret = request_module("target_core_iblock"); |
209 | if (ret != 0) | |
6708bb27 | 210 | pr_err("Unable to load target_core_iblock\n"); |
c66ac9db NB |
211 | |
212 | ret = request_module("target_core_file"); | |
213 | if (ret != 0) | |
6708bb27 | 214 | pr_err("Unable to load target_core_file\n"); |
c66ac9db NB |
215 | |
216 | ret = request_module("target_core_pscsi"); | |
217 | if (ret != 0) | |
6708bb27 | 218 | pr_err("Unable to load target_core_pscsi\n"); |
c66ac9db | 219 | |
7c9e7a6f AG |
220 | ret = request_module("target_core_user"); |
221 | if (ret != 0) | |
222 | pr_err("Unable to load target_core_user\n"); | |
223 | ||
e3d6f909 | 224 | sub_api_initialized = 1; |
c66ac9db NB |
225 | } |
226 | ||
e70beee7 | 227 | struct se_session *transport_init_session(enum target_prot_op sup_prot_ops) |
c66ac9db NB |
228 | { |
229 | struct se_session *se_sess; | |
230 | ||
231 | se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL); | |
6708bb27 AG |
232 | if (!se_sess) { |
233 | pr_err("Unable to allocate struct se_session from" | |
c66ac9db NB |
234 | " se_sess_cache\n"); |
235 | return ERR_PTR(-ENOMEM); | |
236 | } | |
237 | INIT_LIST_HEAD(&se_sess->sess_list); | |
238 | INIT_LIST_HEAD(&se_sess->sess_acl_list); | |
a17f091d | 239 | INIT_LIST_HEAD(&se_sess->sess_cmd_list); |
9b31a328 | 240 | INIT_LIST_HEAD(&se_sess->sess_wait_list); |
a17f091d | 241 | spin_lock_init(&se_sess->sess_cmd_lock); |
41ac82b6 | 242 | kref_init(&se_sess->sess_kref); |
e70beee7 | 243 | se_sess->sup_prot_ops = sup_prot_ops; |
c66ac9db NB |
244 | |
245 | return se_sess; | |
246 | } | |
247 | EXPORT_SYMBOL(transport_init_session); | |
248 | ||
c0add7fd NB |
249 | int transport_alloc_session_tags(struct se_session *se_sess, |
250 | unsigned int tag_num, unsigned int tag_size) | |
251 | { | |
252 | int rc; | |
253 | ||
8c7f6e9b NB |
254 | se_sess->sess_cmd_map = kzalloc(tag_num * tag_size, |
255 | GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT); | |
c0add7fd | 256 | if (!se_sess->sess_cmd_map) { |
8c7f6e9b NB |
257 | se_sess->sess_cmd_map = vzalloc(tag_num * tag_size); |
258 | if (!se_sess->sess_cmd_map) { | |
259 | pr_err("Unable to allocate se_sess->sess_cmd_map\n"); | |
260 | return -ENOMEM; | |
261 | } | |
c0add7fd NB |
262 | } |
263 | ||
264 | rc = percpu_ida_init(&se_sess->sess_tag_pool, tag_num); | |
265 | if (rc < 0) { | |
266 | pr_err("Unable to init se_sess->sess_tag_pool," | |
267 | " tag_num: %u\n", tag_num); | |
de64d3a6 | 268 | kvfree(se_sess->sess_cmd_map); |
c0add7fd NB |
269 | se_sess->sess_cmd_map = NULL; |
270 | return -ENOMEM; | |
271 | } | |
272 | ||
273 | return 0; | |
274 | } | |
275 | EXPORT_SYMBOL(transport_alloc_session_tags); | |
276 | ||
277 | struct se_session *transport_init_session_tags(unsigned int tag_num, | |
e70beee7 NB |
278 | unsigned int tag_size, |
279 | enum target_prot_op sup_prot_ops) | |
c0add7fd NB |
280 | { |
281 | struct se_session *se_sess; | |
282 | int rc; | |
283 | ||
e70beee7 | 284 | se_sess = transport_init_session(sup_prot_ops); |
c0add7fd NB |
285 | if (IS_ERR(se_sess)) |
286 | return se_sess; | |
287 | ||
288 | rc = transport_alloc_session_tags(se_sess, tag_num, tag_size); | |
289 | if (rc < 0) { | |
290 | transport_free_session(se_sess); | |
291 | return ERR_PTR(-ENOMEM); | |
292 | } | |
293 | ||
294 | return se_sess; | |
295 | } | |
296 | EXPORT_SYMBOL(transport_init_session_tags); | |
297 | ||
c66ac9db | 298 | /* |
140854cb | 299 | * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called. |
c66ac9db NB |
300 | */ |
301 | void __transport_register_session( | |
302 | struct se_portal_group *se_tpg, | |
303 | struct se_node_acl *se_nacl, | |
304 | struct se_session *se_sess, | |
305 | void *fabric_sess_ptr) | |
306 | { | |
9ac8928e | 307 | const struct target_core_fabric_ops *tfo = se_tpg->se_tpg_tfo; |
c66ac9db NB |
308 | unsigned char buf[PR_REG_ISID_LEN]; |
309 | ||
310 | se_sess->se_tpg = se_tpg; | |
311 | se_sess->fabric_sess_ptr = fabric_sess_ptr; | |
312 | /* | |
313 | * Used by struct se_node_acl's under ConfigFS to locate active se_session-t | |
314 | * | |
315 | * Only set for struct se_session's that will actually be moving I/O. | |
316 | * eg: *NOT* discovery sessions. | |
317 | */ | |
318 | if (se_nacl) { | |
bffb5128 NB |
319 | /* |
320 | * | |
321 | * Determine if fabric allows for T10-PI feature bits exposed to | |
322 | * initiators for device backends with !dev->dev_attrib.pi_prot_type. | |
323 | * | |
324 | * If so, then always save prot_type on a per se_node_acl node | |
325 | * basis and re-instate the previous sess_prot_type to avoid | |
326 | * disabling PI from below any previously initiator side | |
327 | * registered LUNs. | |
328 | */ | |
329 | if (se_nacl->saved_prot_type) | |
330 | se_sess->sess_prot_type = se_nacl->saved_prot_type; | |
331 | else if (tfo->tpg_check_prot_fabric_only) | |
332 | se_sess->sess_prot_type = se_nacl->saved_prot_type = | |
333 | tfo->tpg_check_prot_fabric_only(se_tpg); | |
c66ac9db NB |
334 | /* |
335 | * If the fabric module supports an ISID based TransportID, | |
336 | * save this value in binary from the fabric I_T Nexus now. | |
337 | */ | |
e3d6f909 | 338 | if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { |
c66ac9db | 339 | memset(&buf[0], 0, PR_REG_ISID_LEN); |
e3d6f909 | 340 | se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, |
c66ac9db NB |
341 | &buf[0], PR_REG_ISID_LEN); |
342 | se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]); | |
343 | } | |
afb999ff | 344 | |
c66ac9db NB |
345 | spin_lock_irq(&se_nacl->nacl_sess_lock); |
346 | /* | |
347 | * The se_nacl->nacl_sess pointer will be set to the | |
348 | * last active I_T Nexus for each struct se_node_acl. | |
349 | */ | |
350 | se_nacl->nacl_sess = se_sess; | |
351 | ||
352 | list_add_tail(&se_sess->sess_acl_list, | |
353 | &se_nacl->acl_sess_list); | |
354 | spin_unlock_irq(&se_nacl->nacl_sess_lock); | |
355 | } | |
356 | list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list); | |
357 | ||
6708bb27 | 358 | pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n", |
e3d6f909 | 359 | se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr); |
c66ac9db NB |
360 | } |
361 | EXPORT_SYMBOL(__transport_register_session); | |
362 | ||
363 | void transport_register_session( | |
364 | struct se_portal_group *se_tpg, | |
365 | struct se_node_acl *se_nacl, | |
366 | struct se_session *se_sess, | |
367 | void *fabric_sess_ptr) | |
368 | { | |
140854cb NB |
369 | unsigned long flags; |
370 | ||
371 | spin_lock_irqsave(&se_tpg->session_lock, flags); | |
c66ac9db | 372 | __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr); |
140854cb | 373 | spin_unlock_irqrestore(&se_tpg->session_lock, flags); |
c66ac9db NB |
374 | } |
375 | EXPORT_SYMBOL(transport_register_session); | |
376 | ||
ecf0dd66 | 377 | static void target_release_session(struct kref *kref) |
41ac82b6 NB |
378 | { |
379 | struct se_session *se_sess = container_of(kref, | |
380 | struct se_session, sess_kref); | |
381 | struct se_portal_group *se_tpg = se_sess->se_tpg; | |
382 | ||
383 | se_tpg->se_tpg_tfo->close_session(se_sess); | |
384 | } | |
385 | ||
d36ad77f | 386 | int target_get_session(struct se_session *se_sess) |
41ac82b6 | 387 | { |
d36ad77f | 388 | return kref_get_unless_zero(&se_sess->sess_kref); |
41ac82b6 NB |
389 | } |
390 | EXPORT_SYMBOL(target_get_session); | |
391 | ||
33933a0e | 392 | void target_put_session(struct se_session *se_sess) |
41ac82b6 | 393 | { |
33933a0e | 394 | kref_put(&se_sess->sess_kref, target_release_session); |
41ac82b6 NB |
395 | } |
396 | EXPORT_SYMBOL(target_put_session); | |
397 | ||
f8e471f9 NB |
398 | ssize_t target_show_dynamic_sessions(struct se_portal_group *se_tpg, char *page) |
399 | { | |
400 | struct se_session *se_sess; | |
401 | ssize_t len = 0; | |
402 | ||
403 | spin_lock_bh(&se_tpg->session_lock); | |
404 | list_for_each_entry(se_sess, &se_tpg->tpg_sess_list, sess_list) { | |
405 | if (!se_sess->se_node_acl) | |
406 | continue; | |
407 | if (!se_sess->se_node_acl->dynamic_node_acl) | |
408 | continue; | |
409 | if (strlen(se_sess->se_node_acl->initiatorname) + 1 + len > PAGE_SIZE) | |
410 | break; | |
411 | ||
412 | len += snprintf(page + len, PAGE_SIZE - len, "%s\n", | |
413 | se_sess->se_node_acl->initiatorname); | |
414 | len += 1; /* Include NULL terminator */ | |
415 | } | |
416 | spin_unlock_bh(&se_tpg->session_lock); | |
417 | ||
418 | return len; | |
419 | } | |
420 | EXPORT_SYMBOL(target_show_dynamic_sessions); | |
421 | ||
afb999ff NB |
422 | static void target_complete_nacl(struct kref *kref) |
423 | { | |
424 | struct se_node_acl *nacl = container_of(kref, | |
425 | struct se_node_acl, acl_kref); | |
426 | ||
427 | complete(&nacl->acl_free_comp); | |
428 | } | |
429 | ||
430 | void target_put_nacl(struct se_node_acl *nacl) | |
431 | { | |
432 | kref_put(&nacl->acl_kref, target_complete_nacl); | |
433 | } | |
21aaa23b | 434 | EXPORT_SYMBOL(target_put_nacl); |
afb999ff | 435 | |
c66ac9db NB |
436 | void transport_deregister_session_configfs(struct se_session *se_sess) |
437 | { | |
438 | struct se_node_acl *se_nacl; | |
23388864 | 439 | unsigned long flags; |
c66ac9db NB |
440 | /* |
441 | * Used by struct se_node_acl's under ConfigFS to locate active struct se_session | |
442 | */ | |
443 | se_nacl = se_sess->se_node_acl; | |
6708bb27 | 444 | if (se_nacl) { |
23388864 | 445 | spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags); |
337c0607 NB |
446 | if (se_nacl->acl_stop == 0) |
447 | list_del(&se_sess->sess_acl_list); | |
c66ac9db NB |
448 | /* |
449 | * If the session list is empty, then clear the pointer. | |
450 | * Otherwise, set the struct se_session pointer from the tail | |
451 | * element of the per struct se_node_acl active session list. | |
452 | */ | |
453 | if (list_empty(&se_nacl->acl_sess_list)) | |
454 | se_nacl->nacl_sess = NULL; | |
455 | else { | |
456 | se_nacl->nacl_sess = container_of( | |
457 | se_nacl->acl_sess_list.prev, | |
458 | struct se_session, sess_acl_list); | |
459 | } | |
23388864 | 460 | spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags); |
c66ac9db NB |
461 | } |
462 | } | |
463 | EXPORT_SYMBOL(transport_deregister_session_configfs); | |
464 | ||
465 | void transport_free_session(struct se_session *se_sess) | |
466 | { | |
21aaa23b NB |
467 | struct se_node_acl *se_nacl = se_sess->se_node_acl; |
468 | /* | |
469 | * Drop the se_node_acl->nacl_kref obtained from within | |
470 | * core_tpg_get_initiator_node_acl(). | |
471 | */ | |
472 | if (se_nacl) { | |
473 | se_sess->se_node_acl = NULL; | |
474 | target_put_nacl(se_nacl); | |
475 | } | |
c0add7fd NB |
476 | if (se_sess->sess_cmd_map) { |
477 | percpu_ida_destroy(&se_sess->sess_tag_pool); | |
de64d3a6 | 478 | kvfree(se_sess->sess_cmd_map); |
c0add7fd | 479 | } |
c66ac9db NB |
480 | kmem_cache_free(se_sess_cache, se_sess); |
481 | } | |
482 | EXPORT_SYMBOL(transport_free_session); | |
483 | ||
484 | void transport_deregister_session(struct se_session *se_sess) | |
485 | { | |
486 | struct se_portal_group *se_tpg = se_sess->se_tpg; | |
9ac8928e | 487 | const struct target_core_fabric_ops *se_tfo; |
c66ac9db | 488 | struct se_node_acl *se_nacl; |
e63a8e19 | 489 | unsigned long flags; |
21aaa23b | 490 | bool drop_nacl = false; |
c66ac9db | 491 | |
6708bb27 | 492 | if (!se_tpg) { |
c66ac9db NB |
493 | transport_free_session(se_sess); |
494 | return; | |
495 | } | |
01468346 | 496 | se_tfo = se_tpg->se_tpg_tfo; |
c66ac9db | 497 | |
e63a8e19 | 498 | spin_lock_irqsave(&se_tpg->session_lock, flags); |
c66ac9db NB |
499 | list_del(&se_sess->sess_list); |
500 | se_sess->se_tpg = NULL; | |
501 | se_sess->fabric_sess_ptr = NULL; | |
e63a8e19 | 502 | spin_unlock_irqrestore(&se_tpg->session_lock, flags); |
c66ac9db NB |
503 | |
504 | /* | |
505 | * Determine if we need to do extra work for this initiator node's | |
506 | * struct se_node_acl if it had been previously dynamically generated. | |
507 | */ | |
508 | se_nacl = se_sess->se_node_acl; | |
01468346 | 509 | |
403edd78 | 510 | mutex_lock(&se_tpg->acl_node_mutex); |
01468346 NB |
511 | if (se_nacl && se_nacl->dynamic_node_acl) { |
512 | if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) { | |
513 | list_del(&se_nacl->acl_list); | |
403edd78 | 514 | drop_nacl = true; |
c66ac9db | 515 | } |
c66ac9db | 516 | } |
403edd78 | 517 | mutex_unlock(&se_tpg->acl_node_mutex); |
c66ac9db | 518 | |
403edd78 NB |
519 | if (drop_nacl) { |
520 | core_tpg_wait_for_nacl_pr_ref(se_nacl); | |
521 | core_free_device_list_for_node(se_nacl, se_tpg); | |
21aaa23b | 522 | se_sess->se_node_acl = NULL; |
403edd78 | 523 | kfree(se_nacl); |
403edd78 | 524 | } |
6708bb27 | 525 | pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n", |
e3d6f909 | 526 | se_tpg->se_tpg_tfo->get_fabric_name()); |
01468346 | 527 | /* |
125d0119 | 528 | * If last kref is dropping now for an explicit NodeACL, awake sleeping |
afb999ff | 529 | * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group |
21aaa23b | 530 | * removal context from within transport_free_session() code. |
01468346 | 531 | */ |
01468346 | 532 | |
afb999ff | 533 | transport_free_session(se_sess); |
c66ac9db NB |
534 | } |
535 | EXPORT_SYMBOL(transport_deregister_session); | |
536 | ||
cf572a96 | 537 | static void target_remove_from_state_list(struct se_cmd *cmd) |
c66ac9db | 538 | { |
42bf829e | 539 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
540 | unsigned long flags; |
541 | ||
42bf829e CH |
542 | if (!dev) |
543 | return; | |
c66ac9db | 544 | |
cf572a96 CH |
545 | if (cmd->transport_state & CMD_T_BUSY) |
546 | return; | |
c66ac9db | 547 | |
cf572a96 CH |
548 | spin_lock_irqsave(&dev->execute_task_lock, flags); |
549 | if (cmd->state_active) { | |
550 | list_del(&cmd->state_list); | |
cf572a96 | 551 | cmd->state_active = false; |
c66ac9db | 552 | } |
cf572a96 | 553 | spin_unlock_irqrestore(&dev->execute_task_lock, flags); |
c66ac9db NB |
554 | } |
555 | ||
862e6389 NB |
556 | static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists, |
557 | bool write_pending) | |
c66ac9db NB |
558 | { |
559 | unsigned long flags; | |
560 | ||
f7113a47 CH |
561 | if (remove_from_lists) { |
562 | target_remove_from_state_list(cmd); | |
563 | ||
564 | /* | |
565 | * Clear struct se_cmd->se_lun before the handoff to FE. | |
566 | */ | |
567 | cmd->se_lun = NULL; | |
568 | } | |
569 | ||
febe562c NB |
570 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
571 | if (write_pending) | |
572 | cmd->t_state = TRANSPORT_WRITE_PENDING; | |
573 | ||
c66ac9db NB |
574 | /* |
575 | * Determine if frontend context caller is requesting the stopping of | |
e3d6f909 | 576 | * this command for frontend exceptions. |
c66ac9db | 577 | */ |
7d680f3b | 578 | if (cmd->transport_state & CMD_T_STOP) { |
649ee054 BVA |
579 | pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n", |
580 | __func__, __LINE__, cmd->tag); | |
c66ac9db | 581 | |
a1d8b49a | 582 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 583 | |
a95d6511 | 584 | complete_all(&cmd->t_transport_stop_comp); |
c66ac9db NB |
585 | return 1; |
586 | } | |
f7113a47 CH |
587 | |
588 | cmd->transport_state &= ~CMD_T_ACTIVE; | |
589 | if (remove_from_lists) { | |
590 | /* | |
591 | * Some fabric modules like tcm_loop can release | |
592 | * their internally allocated I/O reference now and | |
593 | * struct se_cmd now. | |
594 | * | |
595 | * Fabric modules are expected to return '1' here if the | |
596 | * se_cmd being passed is released at this point, | |
597 | * or zero if not being released. | |
598 | */ | |
599 | if (cmd->se_tfo->check_stop_free != NULL) { | |
600 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
601 | return cmd->se_tfo->check_stop_free(cmd); | |
c66ac9db | 602 | } |
f7113a47 | 603 | } |
c66ac9db | 604 | |
a1d8b49a | 605 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
606 | return 0; |
607 | } | |
608 | ||
609 | static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd) | |
610 | { | |
862e6389 | 611 | return transport_cmd_check_stop(cmd, true, false); |
c66ac9db NB |
612 | } |
613 | ||
614 | static void transport_lun_remove_cmd(struct se_cmd *cmd) | |
615 | { | |
e3d6f909 | 616 | struct se_lun *lun = cmd->se_lun; |
c66ac9db | 617 | |
5259a06e | 618 | if (!lun) |
c66ac9db NB |
619 | return; |
620 | ||
5259a06e NB |
621 | if (cmpxchg(&cmd->lun_ref_active, true, false)) |
622 | percpu_ref_put(&lun->lun_ref); | |
c66ac9db NB |
623 | } |
624 | ||
625 | void transport_cmd_finish_abort(struct se_cmd *cmd, int remove) | |
626 | { | |
febe562c NB |
627 | bool ack_kref = (cmd->se_cmd_flags & SCF_ACK_KREF); |
628 | ||
68259b5a AL |
629 | if (cmd->se_cmd_flags & SCF_SE_LUN_CMD) |
630 | transport_lun_remove_cmd(cmd); | |
131e6abc NB |
631 | /* |
632 | * Allow the fabric driver to unmap any resources before | |
633 | * releasing the descriptor via TFO->release_cmd() | |
634 | */ | |
635 | if (remove) | |
636 | cmd->se_tfo->aborted_task(cmd); | |
68259b5a | 637 | |
c66ac9db NB |
638 | if (transport_cmd_check_stop_to_fabric(cmd)) |
639 | return; | |
febe562c | 640 | if (remove && ack_kref) |
e6a2573f | 641 | transport_put_cmd(cmd); |
c66ac9db NB |
642 | } |
643 | ||
35e0e757 CH |
644 | static void target_complete_failure_work(struct work_struct *work) |
645 | { | |
646 | struct se_cmd *cmd = container_of(work, struct se_cmd, work); | |
647 | ||
de103c93 CH |
648 | transport_generic_request_failure(cmd, |
649 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE); | |
35e0e757 CH |
650 | } |
651 | ||
6138ed2a | 652 | /* |
d5829eac PB |
653 | * Used when asking transport to copy Sense Data from the underlying |
654 | * Linux/SCSI struct scsi_cmnd | |
6138ed2a | 655 | */ |
d5829eac | 656 | static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd) |
6138ed2a | 657 | { |
6138ed2a | 658 | struct se_device *dev = cmd->se_dev; |
6138ed2a PB |
659 | |
660 | WARN_ON(!cmd->se_lun); | |
661 | ||
662 | if (!dev) | |
d5829eac | 663 | return NULL; |
6138ed2a | 664 | |
d5829eac PB |
665 | if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) |
666 | return NULL; | |
6138ed2a | 667 | |
9c58b7dd | 668 | cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER; |
6138ed2a | 669 | |
d5829eac | 670 | pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n", |
6138ed2a | 671 | dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status); |
9c58b7dd | 672 | return cmd->sense_buffer; |
6138ed2a PB |
673 | } |
674 | ||
5787cacd | 675 | void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status) |
c66ac9db | 676 | { |
42bf829e | 677 | struct se_device *dev = cmd->se_dev; |
5787cacd | 678 | int success = scsi_status == GOOD; |
c66ac9db | 679 | unsigned long flags; |
c66ac9db | 680 | |
5787cacd CH |
681 | cmd->scsi_status = scsi_status; |
682 | ||
683 | ||
a1d8b49a | 684 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
cf572a96 | 685 | cmd->transport_state &= ~CMD_T_BUSY; |
c66ac9db | 686 | |
c66ac9db | 687 | if (dev && dev->transport->transport_complete) { |
d5829eac PB |
688 | dev->transport->transport_complete(cmd, |
689 | cmd->t_data_sg, | |
690 | transport_get_sense_buffer(cmd)); | |
691 | if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) | |
c66ac9db | 692 | success = 1; |
c66ac9db NB |
693 | } |
694 | ||
3d28934a | 695 | /* |
125d0119 | 696 | * Check for case where an explicit ABORT_TASK has been received |
3d28934a NB |
697 | * and transport_wait_for_tasks() will be waiting for completion.. |
698 | */ | |
febe562c | 699 | if (cmd->transport_state & CMD_T_ABORTED || |
3d28934a NB |
700 | cmd->transport_state & CMD_T_STOP) { |
701 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
a95d6511 | 702 | complete_all(&cmd->t_transport_stop_comp); |
3d28934a | 703 | return; |
3dca1471 | 704 | } else if (!success) { |
35e0e757 | 705 | INIT_WORK(&cmd->work, target_complete_failure_work); |
c66ac9db | 706 | } else { |
35e0e757 | 707 | INIT_WORK(&cmd->work, target_complete_ok_work); |
c66ac9db | 708 | } |
35e0e757 | 709 | |
35e0e757 | 710 | cmd->t_state = TRANSPORT_COMPLETE; |
3d28934a | 711 | cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE); |
a1d8b49a | 712 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 713 | |
fb3269ba QT |
714 | if (cmd->cpuid == -1) |
715 | queue_work(target_completion_wq, &cmd->work); | |
716 | else | |
717 | queue_work_on(cmd->cpuid, target_completion_wq, &cmd->work); | |
c66ac9db | 718 | } |
6bb35e00 CH |
719 | EXPORT_SYMBOL(target_complete_cmd); |
720 | ||
2426bd45 RD |
721 | void target_complete_cmd_with_length(struct se_cmd *cmd, u8 scsi_status, int length) |
722 | { | |
723 | if (scsi_status == SAM_STAT_GOOD && length < cmd->data_length) { | |
724 | if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) { | |
725 | cmd->residual_count += cmd->data_length - length; | |
726 | } else { | |
727 | cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT; | |
728 | cmd->residual_count = cmd->data_length - length; | |
729 | } | |
730 | ||
731 | cmd->data_length = length; | |
732 | } | |
733 | ||
734 | target_complete_cmd(cmd, scsi_status); | |
735 | } | |
736 | EXPORT_SYMBOL(target_complete_cmd_with_length); | |
737 | ||
cf572a96 | 738 | static void target_add_to_state_list(struct se_cmd *cmd) |
c66ac9db | 739 | { |
cf572a96 CH |
740 | struct se_device *dev = cmd->se_dev; |
741 | unsigned long flags; | |
c66ac9db | 742 | |
cf572a96 CH |
743 | spin_lock_irqsave(&dev->execute_task_lock, flags); |
744 | if (!cmd->state_active) { | |
745 | list_add_tail(&cmd->state_list, &dev->state_list); | |
746 | cmd->state_active = true; | |
c66ac9db | 747 | } |
cf572a96 | 748 | spin_unlock_irqrestore(&dev->execute_task_lock, flags); |
c66ac9db NB |
749 | } |
750 | ||
07bde79a | 751 | /* |
f147abb4 | 752 | * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status |
07bde79a | 753 | */ |
7a6f0a1e CH |
754 | static void transport_write_pending_qf(struct se_cmd *cmd); |
755 | static void transport_complete_qf(struct se_cmd *cmd); | |
07bde79a | 756 | |
0fd97ccf | 757 | void target_qf_do_work(struct work_struct *work) |
07bde79a NB |
758 | { |
759 | struct se_device *dev = container_of(work, struct se_device, | |
760 | qf_work_queue); | |
bcac364a | 761 | LIST_HEAD(qf_cmd_list); |
07bde79a NB |
762 | struct se_cmd *cmd, *cmd_tmp; |
763 | ||
764 | spin_lock_irq(&dev->qf_cmd_lock); | |
bcac364a RD |
765 | list_splice_init(&dev->qf_cmd_list, &qf_cmd_list); |
766 | spin_unlock_irq(&dev->qf_cmd_lock); | |
07bde79a | 767 | |
bcac364a | 768 | list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) { |
07bde79a | 769 | list_del(&cmd->se_qf_node); |
33940d09 | 770 | atomic_dec_mb(&dev->dev_qf_count); |
07bde79a | 771 | |
6708bb27 | 772 | pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue" |
07bde79a | 773 | " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd, |
e057f533 | 774 | (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" : |
07bde79a NB |
775 | (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING" |
776 | : "UNKNOWN"); | |
f7a5cc0b | 777 | |
7a6f0a1e CH |
778 | if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) |
779 | transport_write_pending_qf(cmd); | |
780 | else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) | |
781 | transport_complete_qf(cmd); | |
07bde79a | 782 | } |
07bde79a NB |
783 | } |
784 | ||
c66ac9db NB |
785 | unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd) |
786 | { | |
787 | switch (cmd->data_direction) { | |
788 | case DMA_NONE: | |
789 | return "NONE"; | |
790 | case DMA_FROM_DEVICE: | |
791 | return "READ"; | |
792 | case DMA_TO_DEVICE: | |
793 | return "WRITE"; | |
794 | case DMA_BIDIRECTIONAL: | |
795 | return "BIDI"; | |
796 | default: | |
797 | break; | |
798 | } | |
799 | ||
800 | return "UNKNOWN"; | |
801 | } | |
802 | ||
803 | void transport_dump_dev_state( | |
804 | struct se_device *dev, | |
805 | char *b, | |
806 | int *bl) | |
807 | { | |
808 | *bl += sprintf(b + *bl, "Status: "); | |
0fd97ccf | 809 | if (dev->export_count) |
c66ac9db | 810 | *bl += sprintf(b + *bl, "ACTIVATED"); |
0fd97ccf | 811 | else |
c66ac9db | 812 | *bl += sprintf(b + *bl, "DEACTIVATED"); |
c66ac9db | 813 | |
5f41a31d | 814 | *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth); |
11e764bd | 815 | *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n", |
0fd97ccf CH |
816 | dev->dev_attrib.block_size, |
817 | dev->dev_attrib.hw_max_sectors); | |
c66ac9db NB |
818 | *bl += sprintf(b + *bl, " "); |
819 | } | |
820 | ||
c66ac9db NB |
821 | void transport_dump_vpd_proto_id( |
822 | struct t10_vpd *vpd, | |
823 | unsigned char *p_buf, | |
824 | int p_buf_len) | |
825 | { | |
826 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
827 | int len; | |
828 | ||
829 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
830 | len = sprintf(buf, "T10 VPD Protocol Identifier: "); | |
831 | ||
832 | switch (vpd->protocol_identifier) { | |
833 | case 0x00: | |
834 | sprintf(buf+len, "Fibre Channel\n"); | |
835 | break; | |
836 | case 0x10: | |
837 | sprintf(buf+len, "Parallel SCSI\n"); | |
838 | break; | |
839 | case 0x20: | |
840 | sprintf(buf+len, "SSA\n"); | |
841 | break; | |
842 | case 0x30: | |
843 | sprintf(buf+len, "IEEE 1394\n"); | |
844 | break; | |
845 | case 0x40: | |
846 | sprintf(buf+len, "SCSI Remote Direct Memory Access" | |
847 | " Protocol\n"); | |
848 | break; | |
849 | case 0x50: | |
850 | sprintf(buf+len, "Internet SCSI (iSCSI)\n"); | |
851 | break; | |
852 | case 0x60: | |
853 | sprintf(buf+len, "SAS Serial SCSI Protocol\n"); | |
854 | break; | |
855 | case 0x70: | |
856 | sprintf(buf+len, "Automation/Drive Interface Transport" | |
857 | " Protocol\n"); | |
858 | break; | |
859 | case 0x80: | |
860 | sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n"); | |
861 | break; | |
862 | default: | |
863 | sprintf(buf+len, "Unknown 0x%02x\n", | |
864 | vpd->protocol_identifier); | |
865 | break; | |
866 | } | |
867 | ||
868 | if (p_buf) | |
869 | strncpy(p_buf, buf, p_buf_len); | |
870 | else | |
6708bb27 | 871 | pr_debug("%s", buf); |
c66ac9db NB |
872 | } |
873 | ||
874 | void | |
875 | transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83) | |
876 | { | |
877 | /* | |
878 | * Check if the Protocol Identifier Valid (PIV) bit is set.. | |
879 | * | |
880 | * from spc3r23.pdf section 7.5.1 | |
881 | */ | |
882 | if (page_83[1] & 0x80) { | |
883 | vpd->protocol_identifier = (page_83[0] & 0xf0); | |
884 | vpd->protocol_identifier_set = 1; | |
885 | transport_dump_vpd_proto_id(vpd, NULL, 0); | |
886 | } | |
887 | } | |
888 | EXPORT_SYMBOL(transport_set_vpd_proto_id); | |
889 | ||
890 | int transport_dump_vpd_assoc( | |
891 | struct t10_vpd *vpd, | |
892 | unsigned char *p_buf, | |
893 | int p_buf_len) | |
894 | { | |
895 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
e3d6f909 AG |
896 | int ret = 0; |
897 | int len; | |
c66ac9db NB |
898 | |
899 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
900 | len = sprintf(buf, "T10 VPD Identifier Association: "); | |
901 | ||
902 | switch (vpd->association) { | |
903 | case 0x00: | |
904 | sprintf(buf+len, "addressed logical unit\n"); | |
905 | break; | |
906 | case 0x10: | |
907 | sprintf(buf+len, "target port\n"); | |
908 | break; | |
909 | case 0x20: | |
910 | sprintf(buf+len, "SCSI target device\n"); | |
911 | break; | |
912 | default: | |
913 | sprintf(buf+len, "Unknown 0x%02x\n", vpd->association); | |
e3d6f909 | 914 | ret = -EINVAL; |
c66ac9db NB |
915 | break; |
916 | } | |
917 | ||
918 | if (p_buf) | |
919 | strncpy(p_buf, buf, p_buf_len); | |
920 | else | |
6708bb27 | 921 | pr_debug("%s", buf); |
c66ac9db NB |
922 | |
923 | return ret; | |
924 | } | |
925 | ||
926 | int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83) | |
927 | { | |
928 | /* | |
929 | * The VPD identification association.. | |
930 | * | |
931 | * from spc3r23.pdf Section 7.6.3.1 Table 297 | |
932 | */ | |
933 | vpd->association = (page_83[1] & 0x30); | |
934 | return transport_dump_vpd_assoc(vpd, NULL, 0); | |
935 | } | |
936 | EXPORT_SYMBOL(transport_set_vpd_assoc); | |
937 | ||
938 | int transport_dump_vpd_ident_type( | |
939 | struct t10_vpd *vpd, | |
940 | unsigned char *p_buf, | |
941 | int p_buf_len) | |
942 | { | |
943 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
e3d6f909 AG |
944 | int ret = 0; |
945 | int len; | |
c66ac9db NB |
946 | |
947 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
948 | len = sprintf(buf, "T10 VPD Identifier Type: "); | |
949 | ||
950 | switch (vpd->device_identifier_type) { | |
951 | case 0x00: | |
952 | sprintf(buf+len, "Vendor specific\n"); | |
953 | break; | |
954 | case 0x01: | |
955 | sprintf(buf+len, "T10 Vendor ID based\n"); | |
956 | break; | |
957 | case 0x02: | |
958 | sprintf(buf+len, "EUI-64 based\n"); | |
959 | break; | |
960 | case 0x03: | |
961 | sprintf(buf+len, "NAA\n"); | |
962 | break; | |
963 | case 0x04: | |
964 | sprintf(buf+len, "Relative target port identifier\n"); | |
965 | break; | |
966 | case 0x08: | |
967 | sprintf(buf+len, "SCSI name string\n"); | |
968 | break; | |
969 | default: | |
970 | sprintf(buf+len, "Unsupported: 0x%02x\n", | |
971 | vpd->device_identifier_type); | |
e3d6f909 | 972 | ret = -EINVAL; |
c66ac9db NB |
973 | break; |
974 | } | |
975 | ||
e3d6f909 AG |
976 | if (p_buf) { |
977 | if (p_buf_len < strlen(buf)+1) | |
978 | return -EINVAL; | |
c66ac9db | 979 | strncpy(p_buf, buf, p_buf_len); |
e3d6f909 | 980 | } else { |
6708bb27 | 981 | pr_debug("%s", buf); |
e3d6f909 | 982 | } |
c66ac9db NB |
983 | |
984 | return ret; | |
985 | } | |
986 | ||
987 | int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83) | |
988 | { | |
989 | /* | |
990 | * The VPD identifier type.. | |
991 | * | |
992 | * from spc3r23.pdf Section 7.6.3.1 Table 298 | |
993 | */ | |
994 | vpd->device_identifier_type = (page_83[1] & 0x0f); | |
995 | return transport_dump_vpd_ident_type(vpd, NULL, 0); | |
996 | } | |
997 | EXPORT_SYMBOL(transport_set_vpd_ident_type); | |
998 | ||
999 | int transport_dump_vpd_ident( | |
1000 | struct t10_vpd *vpd, | |
1001 | unsigned char *p_buf, | |
1002 | int p_buf_len) | |
1003 | { | |
1004 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
1005 | int ret = 0; | |
1006 | ||
1007 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
1008 | ||
1009 | switch (vpd->device_identifier_code_set) { | |
1010 | case 0x01: /* Binary */ | |
703d641d DC |
1011 | snprintf(buf, sizeof(buf), |
1012 | "T10 VPD Binary Device Identifier: %s\n", | |
c66ac9db NB |
1013 | &vpd->device_identifier[0]); |
1014 | break; | |
1015 | case 0x02: /* ASCII */ | |
703d641d DC |
1016 | snprintf(buf, sizeof(buf), |
1017 | "T10 VPD ASCII Device Identifier: %s\n", | |
c66ac9db NB |
1018 | &vpd->device_identifier[0]); |
1019 | break; | |
1020 | case 0x03: /* UTF-8 */ | |
703d641d DC |
1021 | snprintf(buf, sizeof(buf), |
1022 | "T10 VPD UTF-8 Device Identifier: %s\n", | |
c66ac9db NB |
1023 | &vpd->device_identifier[0]); |
1024 | break; | |
1025 | default: | |
1026 | sprintf(buf, "T10 VPD Device Identifier encoding unsupported:" | |
1027 | " 0x%02x", vpd->device_identifier_code_set); | |
e3d6f909 | 1028 | ret = -EINVAL; |
c66ac9db NB |
1029 | break; |
1030 | } | |
1031 | ||
1032 | if (p_buf) | |
1033 | strncpy(p_buf, buf, p_buf_len); | |
1034 | else | |
6708bb27 | 1035 | pr_debug("%s", buf); |
c66ac9db NB |
1036 | |
1037 | return ret; | |
1038 | } | |
1039 | ||
1040 | int | |
1041 | transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83) | |
1042 | { | |
1043 | static const char hex_str[] = "0123456789abcdef"; | |
35d1efe8 | 1044 | int j = 0, i = 4; /* offset to start of the identifier */ |
c66ac9db NB |
1045 | |
1046 | /* | |
1047 | * The VPD Code Set (encoding) | |
1048 | * | |
1049 | * from spc3r23.pdf Section 7.6.3.1 Table 296 | |
1050 | */ | |
1051 | vpd->device_identifier_code_set = (page_83[0] & 0x0f); | |
1052 | switch (vpd->device_identifier_code_set) { | |
1053 | case 0x01: /* Binary */ | |
1054 | vpd->device_identifier[j++] = | |
1055 | hex_str[vpd->device_identifier_type]; | |
1056 | while (i < (4 + page_83[3])) { | |
1057 | vpd->device_identifier[j++] = | |
1058 | hex_str[(page_83[i] & 0xf0) >> 4]; | |
1059 | vpd->device_identifier[j++] = | |
1060 | hex_str[page_83[i] & 0x0f]; | |
1061 | i++; | |
1062 | } | |
1063 | break; | |
1064 | case 0x02: /* ASCII */ | |
1065 | case 0x03: /* UTF-8 */ | |
1066 | while (i < (4 + page_83[3])) | |
1067 | vpd->device_identifier[j++] = page_83[i++]; | |
1068 | break; | |
1069 | default: | |
1070 | break; | |
1071 | } | |
1072 | ||
1073 | return transport_dump_vpd_ident(vpd, NULL, 0); | |
1074 | } | |
1075 | EXPORT_SYMBOL(transport_set_vpd_ident); | |
1076 | ||
8f9b5654 NB |
1077 | static sense_reason_t |
1078 | target_check_max_data_sg_nents(struct se_cmd *cmd, struct se_device *dev, | |
1079 | unsigned int size) | |
1080 | { | |
1081 | u32 mtl; | |
1082 | ||
1083 | if (!cmd->se_tfo->max_data_sg_nents) | |
1084 | return TCM_NO_SENSE; | |
1085 | /* | |
1086 | * Check if fabric enforced maximum SGL entries per I/O descriptor | |
1087 | * exceeds se_cmd->data_length. If true, set SCF_UNDERFLOW_BIT + | |
1088 | * residual_count and reduce original cmd->data_length to maximum | |
1089 | * length based on single PAGE_SIZE entry scatter-lists. | |
1090 | */ | |
1091 | mtl = (cmd->se_tfo->max_data_sg_nents * PAGE_SIZE); | |
1092 | if (cmd->data_length > mtl) { | |
1093 | /* | |
1094 | * If an existing CDB overflow is present, calculate new residual | |
1095 | * based on CDB size minus fabric maximum transfer length. | |
1096 | * | |
1097 | * If an existing CDB underflow is present, calculate new residual | |
1098 | * based on original cmd->data_length minus fabric maximum transfer | |
1099 | * length. | |
1100 | * | |
1101 | * Otherwise, set the underflow residual based on cmd->data_length | |
1102 | * minus fabric maximum transfer length. | |
1103 | */ | |
1104 | if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) { | |
1105 | cmd->residual_count = (size - mtl); | |
1106 | } else if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) { | |
1107 | u32 orig_dl = size + cmd->residual_count; | |
1108 | cmd->residual_count = (orig_dl - mtl); | |
1109 | } else { | |
1110 | cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT; | |
1111 | cmd->residual_count = (cmd->data_length - mtl); | |
1112 | } | |
1113 | cmd->data_length = mtl; | |
1114 | /* | |
1115 | * Reset sbc_check_prot() calculated protection payload | |
1116 | * length based upon the new smaller MTL. | |
1117 | */ | |
1118 | if (cmd->prot_length) { | |
1119 | u32 sectors = (mtl / dev->dev_attrib.block_size); | |
1120 | cmd->prot_length = dev->prot_length * sectors; | |
1121 | } | |
1122 | } | |
1123 | return TCM_NO_SENSE; | |
1124 | } | |
1125 | ||
de103c93 CH |
1126 | sense_reason_t |
1127 | target_cmd_size_check(struct se_cmd *cmd, unsigned int size) | |
9b3b8041 CH |
1128 | { |
1129 | struct se_device *dev = cmd->se_dev; | |
1130 | ||
1131 | if (cmd->unknown_data_length) { | |
1132 | cmd->data_length = size; | |
1133 | } else if (size != cmd->data_length) { | |
1134 | pr_warn("TARGET_CORE[%s]: Expected Transfer Length:" | |
1135 | " %u does not match SCSI CDB Length: %u for SAM Opcode:" | |
1136 | " 0x%02x\n", cmd->se_tfo->get_fabric_name(), | |
1137 | cmd->data_length, size, cmd->t_task_cdb[0]); | |
1138 | ||
c72c5250 RD |
1139 | if (cmd->data_direction == DMA_TO_DEVICE && |
1140 | cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) { | |
1141 | pr_err("Rejecting underflow/overflow WRITE data\n"); | |
de103c93 | 1142 | return TCM_INVALID_CDB_FIELD; |
9b3b8041 CH |
1143 | } |
1144 | /* | |
1145 | * Reject READ_* or WRITE_* with overflow/underflow for | |
1146 | * type SCF_SCSI_DATA_CDB. | |
1147 | */ | |
0fd97ccf | 1148 | if (dev->dev_attrib.block_size != 512) { |
9b3b8041 CH |
1149 | pr_err("Failing OVERFLOW/UNDERFLOW for LBA op" |
1150 | " CDB on non 512-byte sector setup subsystem" | |
1151 | " plugin: %s\n", dev->transport->name); | |
1152 | /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */ | |
de103c93 | 1153 | return TCM_INVALID_CDB_FIELD; |
9b3b8041 | 1154 | } |
4c054ba6 NB |
1155 | /* |
1156 | * For the overflow case keep the existing fabric provided | |
1157 | * ->data_length. Otherwise for the underflow case, reset | |
1158 | * ->data_length to the smaller SCSI expected data transfer | |
1159 | * length. | |
1160 | */ | |
9b3b8041 CH |
1161 | if (size > cmd->data_length) { |
1162 | cmd->se_cmd_flags |= SCF_OVERFLOW_BIT; | |
1163 | cmd->residual_count = (size - cmd->data_length); | |
1164 | } else { | |
1165 | cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT; | |
1166 | cmd->residual_count = (cmd->data_length - size); | |
4c054ba6 | 1167 | cmd->data_length = size; |
9b3b8041 | 1168 | } |
9b3b8041 CH |
1169 | } |
1170 | ||
8f9b5654 | 1171 | return target_check_max_data_sg_nents(cmd, dev, size); |
9b3b8041 | 1172 | |
9b3b8041 CH |
1173 | } |
1174 | ||
c66ac9db NB |
1175 | /* |
1176 | * Used by fabric modules containing a local struct se_cmd within their | |
1177 | * fabric dependent per I/O descriptor. | |
649ee054 BVA |
1178 | * |
1179 | * Preserves the value of @cmd->tag. | |
c66ac9db NB |
1180 | */ |
1181 | void transport_init_se_cmd( | |
1182 | struct se_cmd *cmd, | |
9ac8928e | 1183 | const struct target_core_fabric_ops *tfo, |
c66ac9db NB |
1184 | struct se_session *se_sess, |
1185 | u32 data_length, | |
1186 | int data_direction, | |
1187 | int task_attr, | |
1188 | unsigned char *sense_buffer) | |
1189 | { | |
5951146d | 1190 | INIT_LIST_HEAD(&cmd->se_delayed_node); |
07bde79a | 1191 | INIT_LIST_HEAD(&cmd->se_qf_node); |
a17f091d | 1192 | INIT_LIST_HEAD(&cmd->se_cmd_list); |
cf572a96 | 1193 | INIT_LIST_HEAD(&cmd->state_list); |
a1d8b49a | 1194 | init_completion(&cmd->t_transport_stop_comp); |
a17f091d | 1195 | init_completion(&cmd->cmd_wait_comp); |
a1d8b49a | 1196 | spin_lock_init(&cmd->t_state_lock); |
1e1110c4 | 1197 | kref_init(&cmd->cmd_kref); |
7d680f3b | 1198 | cmd->transport_state = CMD_T_DEV_ACTIVE; |
c66ac9db NB |
1199 | |
1200 | cmd->se_tfo = tfo; | |
1201 | cmd->se_sess = se_sess; | |
1202 | cmd->data_length = data_length; | |
1203 | cmd->data_direction = data_direction; | |
1204 | cmd->sam_task_attr = task_attr; | |
1205 | cmd->sense_buffer = sense_buffer; | |
cf572a96 CH |
1206 | |
1207 | cmd->state_active = false; | |
c66ac9db NB |
1208 | } |
1209 | EXPORT_SYMBOL(transport_init_se_cmd); | |
1210 | ||
de103c93 CH |
1211 | static sense_reason_t |
1212 | transport_check_alloc_task_attr(struct se_cmd *cmd) | |
c66ac9db | 1213 | { |
019c4ca6 CH |
1214 | struct se_device *dev = cmd->se_dev; |
1215 | ||
c66ac9db NB |
1216 | /* |
1217 | * Check if SAM Task Attribute emulation is enabled for this | |
1218 | * struct se_device storage object | |
1219 | */ | |
a3541703 | 1220 | if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH) |
c66ac9db NB |
1221 | return 0; |
1222 | ||
68d81f40 | 1223 | if (cmd->sam_task_attr == TCM_ACA_TAG) { |
6708bb27 | 1224 | pr_debug("SAM Task Attribute ACA" |
c66ac9db | 1225 | " emulation is not supported\n"); |
de103c93 | 1226 | return TCM_INVALID_CDB_FIELD; |
c66ac9db | 1227 | } |
9c31820b | 1228 | |
c66ac9db NB |
1229 | return 0; |
1230 | } | |
1231 | ||
de103c93 CH |
1232 | sense_reason_t |
1233 | target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb) | |
c66ac9db | 1234 | { |
0fd97ccf | 1235 | struct se_device *dev = cmd->se_dev; |
de103c93 | 1236 | sense_reason_t ret; |
c66ac9db | 1237 | |
c66ac9db NB |
1238 | /* |
1239 | * Ensure that the received CDB is less than the max (252 + 8) bytes | |
1240 | * for VARIABLE_LENGTH_CMD | |
1241 | */ | |
1242 | if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) { | |
6708bb27 | 1243 | pr_err("Received SCSI CDB with command_size: %d that" |
c66ac9db NB |
1244 | " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n", |
1245 | scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE); | |
de103c93 | 1246 | return TCM_INVALID_CDB_FIELD; |
c66ac9db NB |
1247 | } |
1248 | /* | |
1249 | * If the received CDB is larger than TCM_MAX_COMMAND_SIZE, | |
1250 | * allocate the additional extended CDB buffer now.. Otherwise | |
1251 | * setup the pointer from __t_task_cdb to t_task_cdb. | |
1252 | */ | |
a1d8b49a AG |
1253 | if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) { |
1254 | cmd->t_task_cdb = kzalloc(scsi_command_size(cdb), | |
c66ac9db | 1255 | GFP_KERNEL); |
6708bb27 AG |
1256 | if (!cmd->t_task_cdb) { |
1257 | pr_err("Unable to allocate cmd->t_task_cdb" | |
a1d8b49a | 1258 | " %u > sizeof(cmd->__t_task_cdb): %lu ops\n", |
c66ac9db | 1259 | scsi_command_size(cdb), |
a1d8b49a | 1260 | (unsigned long)sizeof(cmd->__t_task_cdb)); |
de103c93 | 1261 | return TCM_OUT_OF_RESOURCES; |
c66ac9db NB |
1262 | } |
1263 | } else | |
a1d8b49a | 1264 | cmd->t_task_cdb = &cmd->__t_task_cdb[0]; |
c66ac9db | 1265 | /* |
a1d8b49a | 1266 | * Copy the original CDB into cmd-> |
c66ac9db | 1267 | */ |
a1d8b49a | 1268 | memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb)); |
cb4f4d3c | 1269 | |
e5c0d6ad RD |
1270 | trace_target_sequencer_start(cmd); |
1271 | ||
cb4f4d3c CH |
1272 | /* |
1273 | * Check for an existing UNIT ATTENTION condition | |
1274 | */ | |
de103c93 CH |
1275 | ret = target_scsi3_ua_check(cmd); |
1276 | if (ret) | |
1277 | return ret; | |
cb4f4d3c | 1278 | |
c87fbd56 | 1279 | ret = target_alua_state_check(cmd); |
de103c93 CH |
1280 | if (ret) |
1281 | return ret; | |
cb4f4d3c | 1282 | |
d977f437 | 1283 | ret = target_check_reservation(cmd); |
f85eda8d NB |
1284 | if (ret) { |
1285 | cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT; | |
d977f437 | 1286 | return ret; |
f85eda8d | 1287 | } |
cb4f4d3c | 1288 | |
0fd97ccf | 1289 | ret = dev->transport->parse_cdb(cmd); |
568e1f65 JE |
1290 | if (ret == TCM_UNSUPPORTED_SCSI_OPCODE) |
1291 | pr_warn_ratelimited("%s/%s: Unsupported SCSI Opcode 0x%02x, sending CHECK_CONDITION.\n", | |
1292 | cmd->se_tfo->get_fabric_name(), | |
1293 | cmd->se_sess->se_node_acl->initiatorname, | |
1294 | cmd->t_task_cdb[0]); | |
de103c93 CH |
1295 | if (ret) |
1296 | return ret; | |
1297 | ||
1298 | ret = transport_check_alloc_task_attr(cmd); | |
1299 | if (ret) | |
c66ac9db | 1300 | return ret; |
cb4f4d3c | 1301 | |
cb4f4d3c | 1302 | cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE; |
4cc987ea | 1303 | atomic_long_inc(&cmd->se_lun->lun_stats.cmd_pdus); |
c66ac9db NB |
1304 | return 0; |
1305 | } | |
a12f41f8 | 1306 | EXPORT_SYMBOL(target_setup_cmd_from_cdb); |
c66ac9db | 1307 | |
695434e1 NB |
1308 | /* |
1309 | * Used by fabric module frontends to queue tasks directly. | |
ac75d8be | 1310 | * May only be used from process context. |
695434e1 NB |
1311 | */ |
1312 | int transport_handle_cdb_direct( | |
1313 | struct se_cmd *cmd) | |
1314 | { | |
de103c93 | 1315 | sense_reason_t ret; |
dd8ae59d | 1316 | |
695434e1 NB |
1317 | if (!cmd->se_lun) { |
1318 | dump_stack(); | |
6708bb27 | 1319 | pr_err("cmd->se_lun is NULL\n"); |
695434e1 NB |
1320 | return -EINVAL; |
1321 | } | |
1322 | if (in_interrupt()) { | |
1323 | dump_stack(); | |
6708bb27 | 1324 | pr_err("transport_generic_handle_cdb cannot be called" |
695434e1 NB |
1325 | " from interrupt context\n"); |
1326 | return -EINVAL; | |
1327 | } | |
dd8ae59d | 1328 | /* |
af877292 CH |
1329 | * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that |
1330 | * outstanding descriptors are handled correctly during shutdown via | |
1331 | * transport_wait_for_tasks() | |
dd8ae59d NB |
1332 | * |
1333 | * Also, we don't take cmd->t_state_lock here as we only expect | |
1334 | * this to be called for initial descriptor submission. | |
1335 | */ | |
1336 | cmd->t_state = TRANSPORT_NEW_CMD; | |
7d680f3b CH |
1337 | cmd->transport_state |= CMD_T_ACTIVE; |
1338 | ||
dd8ae59d NB |
1339 | /* |
1340 | * transport_generic_new_cmd() is already handling QUEUE_FULL, | |
1341 | * so follow TRANSPORT_NEW_CMD processing thread context usage | |
1342 | * and call transport_generic_request_failure() if necessary.. | |
1343 | */ | |
1344 | ret = transport_generic_new_cmd(cmd); | |
de103c93 CH |
1345 | if (ret) |
1346 | transport_generic_request_failure(cmd, ret); | |
dd8ae59d | 1347 | return 0; |
695434e1 NB |
1348 | } |
1349 | EXPORT_SYMBOL(transport_handle_cdb_direct); | |
1350 | ||
c5ff8d6b | 1351 | sense_reason_t |
de103c93 CH |
1352 | transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl, |
1353 | u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count) | |
1354 | { | |
1355 | if (!sgl || !sgl_count) | |
1356 | return 0; | |
1357 | ||
1358 | /* | |
1359 | * Reject SCSI data overflow with map_mem_to_cmd() as incoming | |
1360 | * scatterlists already have been set to follow what the fabric | |
1361 | * passes for the original expected data transfer length. | |
1362 | */ | |
1363 | if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) { | |
1364 | pr_warn("Rejecting SCSI DATA overflow for fabric using" | |
1365 | " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n"); | |
1366 | return TCM_INVALID_CDB_FIELD; | |
1367 | } | |
1368 | ||
1369 | cmd->t_data_sg = sgl; | |
1370 | cmd->t_data_nents = sgl_count; | |
b32bd0a8 IT |
1371 | cmd->t_bidi_data_sg = sgl_bidi; |
1372 | cmd->t_bidi_data_nents = sgl_bidi_count; | |
de103c93 | 1373 | |
de103c93 CH |
1374 | cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC; |
1375 | return 0; | |
1376 | } | |
1377 | ||
a026757f NB |
1378 | /* |
1379 | * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized | |
1380 | * se_cmd + use pre-allocated SGL memory. | |
a6360785 NB |
1381 | * |
1382 | * @se_cmd: command descriptor to submit | |
1383 | * @se_sess: associated se_sess for endpoint | |
1384 | * @cdb: pointer to SCSI CDB | |
1385 | * @sense: pointer to SCSI sense buffer | |
1386 | * @unpacked_lun: unpacked LUN to reference for struct se_lun | |
1387 | * @data_length: fabric expected data transfer length | |
1388 | * @task_addr: SAM task attribute | |
1389 | * @data_dir: DMA data direction | |
1390 | * @flags: flags for command submission from target_sc_flags_tables | |
a026757f NB |
1391 | * @sgl: struct scatterlist memory for unidirectional mapping |
1392 | * @sgl_count: scatterlist count for unidirectional mapping | |
1393 | * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping | |
1394 | * @sgl_bidi_count: scatterlist count for bidirectional READ mapping | |
def2b339 NB |
1395 | * @sgl_prot: struct scatterlist memory protection information |
1396 | * @sgl_prot_count: scatterlist count for protection information | |
a6360785 | 1397 | * |
649ee054 BVA |
1398 | * Task tags are supported if the caller has set @se_cmd->tag. |
1399 | * | |
d6dfc868 RD |
1400 | * Returns non zero to signal active I/O shutdown failure. All other |
1401 | * setup exceptions will be returned as a SCSI CHECK_CONDITION response, | |
1402 | * but still return zero here. | |
1403 | * | |
a6360785 NB |
1404 | * This may only be called from process context, and also currently |
1405 | * assumes internal allocation of fabric payload buffer by target-core. | |
a026757f NB |
1406 | */ |
1407 | int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess, | |
f2d30680 | 1408 | unsigned char *cdb, unsigned char *sense, u64 unpacked_lun, |
a026757f NB |
1409 | u32 data_length, int task_attr, int data_dir, int flags, |
1410 | struct scatterlist *sgl, u32 sgl_count, | |
def2b339 NB |
1411 | struct scatterlist *sgl_bidi, u32 sgl_bidi_count, |
1412 | struct scatterlist *sgl_prot, u32 sgl_prot_count) | |
a6360785 NB |
1413 | { |
1414 | struct se_portal_group *se_tpg; | |
de103c93 CH |
1415 | sense_reason_t rc; |
1416 | int ret; | |
a6360785 NB |
1417 | |
1418 | se_tpg = se_sess->se_tpg; | |
1419 | BUG_ON(!se_tpg); | |
1420 | BUG_ON(se_cmd->se_tfo || se_cmd->se_sess); | |
1421 | BUG_ON(in_interrupt()); | |
1422 | /* | |
1423 | * Initialize se_cmd for target operation. From this point | |
1424 | * exceptions are handled by sending exception status via | |
1425 | * target_core_fabric_ops->queue_status() callback | |
1426 | */ | |
1427 | transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, | |
1428 | data_length, data_dir, task_attr, sense); | |
b0d79946 SAS |
1429 | if (flags & TARGET_SCF_UNKNOWN_SIZE) |
1430 | se_cmd->unknown_data_length = 1; | |
a6360785 NB |
1431 | /* |
1432 | * Obtain struct se_cmd->cmd_kref reference and add new cmd to | |
1433 | * se_sess->sess_cmd_list. A second kref_get here is necessary | |
1434 | * for fabrics using TARGET_SCF_ACK_KREF that expect a second | |
1435 | * kref_put() to happen during fabric packet acknowledgement. | |
1436 | */ | |
afc16604 | 1437 | ret = target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF); |
de103c93 CH |
1438 | if (ret) |
1439 | return ret; | |
a6360785 NB |
1440 | /* |
1441 | * Signal bidirectional data payloads to target-core | |
1442 | */ | |
1443 | if (flags & TARGET_SCF_BIDI_OP) | |
1444 | se_cmd->se_cmd_flags |= SCF_BIDI; | |
1445 | /* | |
1446 | * Locate se_lun pointer and attach it to struct se_cmd | |
1447 | */ | |
de103c93 CH |
1448 | rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun); |
1449 | if (rc) { | |
1450 | transport_send_check_condition_and_sense(se_cmd, rc, 0); | |
afc16604 | 1451 | target_put_sess_cmd(se_cmd); |
d6dfc868 | 1452 | return 0; |
735703ca | 1453 | } |
b5b8e298 SG |
1454 | |
1455 | rc = target_setup_cmd_from_cdb(se_cmd, cdb); | |
1456 | if (rc != 0) { | |
1457 | transport_generic_request_failure(se_cmd, rc); | |
1458 | return 0; | |
1459 | } | |
1460 | ||
def2b339 NB |
1461 | /* |
1462 | * Save pointers for SGLs containing protection information, | |
1463 | * if present. | |
1464 | */ | |
1465 | if (sgl_prot_count) { | |
1466 | se_cmd->t_prot_sg = sgl_prot; | |
1467 | se_cmd->t_prot_nents = sgl_prot_count; | |
5835812f | 1468 | se_cmd->se_cmd_flags |= SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC; |
def2b339 | 1469 | } |
d6e0175c | 1470 | |
a026757f NB |
1471 | /* |
1472 | * When a non zero sgl_count has been passed perform SGL passthrough | |
1473 | * mapping for pre-allocated fabric memory instead of having target | |
1474 | * core perform an internal SGL allocation.. | |
1475 | */ | |
1476 | if (sgl_count != 0) { | |
1477 | BUG_ON(!sgl); | |
1478 | ||
944981c7 NB |
1479 | /* |
1480 | * A work-around for tcm_loop as some userspace code via | |
1481 | * scsi-generic do not memset their associated read buffers, | |
1482 | * so go ahead and do that here for type non-data CDBs. Also | |
1483 | * note that this is currently guaranteed to be a single SGL | |
1484 | * for this case by target core in target_setup_cmd_from_cdb() | |
1485 | * -> transport_generic_cmd_sequencer(). | |
1486 | */ | |
1487 | if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) && | |
1488 | se_cmd->data_direction == DMA_FROM_DEVICE) { | |
1489 | unsigned char *buf = NULL; | |
1490 | ||
1491 | if (sgl) | |
1492 | buf = kmap(sg_page(sgl)) + sgl->offset; | |
1493 | ||
1494 | if (buf) { | |
1495 | memset(buf, 0, sgl->length); | |
1496 | kunmap(sg_page(sgl)); | |
1497 | } | |
1498 | } | |
1499 | ||
a026757f NB |
1500 | rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count, |
1501 | sgl_bidi, sgl_bidi_count); | |
1502 | if (rc != 0) { | |
de103c93 | 1503 | transport_generic_request_failure(se_cmd, rc); |
a026757f NB |
1504 | return 0; |
1505 | } | |
1506 | } | |
def2b339 | 1507 | |
11e319ed AG |
1508 | /* |
1509 | * Check if we need to delay processing because of ALUA | |
1510 | * Active/NonOptimized primary access state.. | |
1511 | */ | |
1512 | core_alua_check_nonop_delay(se_cmd); | |
1513 | ||
a6360785 | 1514 | transport_handle_cdb_direct(se_cmd); |
d6dfc868 | 1515 | return 0; |
a6360785 | 1516 | } |
a026757f NB |
1517 | EXPORT_SYMBOL(target_submit_cmd_map_sgls); |
1518 | ||
1519 | /* | |
1520 | * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd | |
1521 | * | |
1522 | * @se_cmd: command descriptor to submit | |
1523 | * @se_sess: associated se_sess for endpoint | |
1524 | * @cdb: pointer to SCSI CDB | |
1525 | * @sense: pointer to SCSI sense buffer | |
1526 | * @unpacked_lun: unpacked LUN to reference for struct se_lun | |
1527 | * @data_length: fabric expected data transfer length | |
1528 | * @task_addr: SAM task attribute | |
1529 | * @data_dir: DMA data direction | |
1530 | * @flags: flags for command submission from target_sc_flags_tables | |
1531 | * | |
649ee054 BVA |
1532 | * Task tags are supported if the caller has set @se_cmd->tag. |
1533 | * | |
a026757f NB |
1534 | * Returns non zero to signal active I/O shutdown failure. All other |
1535 | * setup exceptions will be returned as a SCSI CHECK_CONDITION response, | |
1536 | * but still return zero here. | |
1537 | * | |
1538 | * This may only be called from process context, and also currently | |
1539 | * assumes internal allocation of fabric payload buffer by target-core. | |
1540 | * | |
1541 | * It also assumes interal target core SGL memory allocation. | |
1542 | */ | |
1543 | int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess, | |
f2d30680 | 1544 | unsigned char *cdb, unsigned char *sense, u64 unpacked_lun, |
a026757f NB |
1545 | u32 data_length, int task_attr, int data_dir, int flags) |
1546 | { | |
1547 | return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense, | |
1548 | unpacked_lun, data_length, task_attr, data_dir, | |
def2b339 | 1549 | flags, NULL, 0, NULL, 0, NULL, 0); |
a026757f | 1550 | } |
a6360785 NB |
1551 | EXPORT_SYMBOL(target_submit_cmd); |
1552 | ||
9f0d05c2 NB |
1553 | static void target_complete_tmr_failure(struct work_struct *work) |
1554 | { | |
1555 | struct se_cmd *se_cmd = container_of(work, struct se_cmd, work); | |
1556 | ||
1557 | se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST; | |
1558 | se_cmd->se_tfo->queue_tm_rsp(se_cmd); | |
5a3b6fc0 RD |
1559 | |
1560 | transport_cmd_check_stop_to_fabric(se_cmd); | |
9f0d05c2 NB |
1561 | } |
1562 | ||
ea98d7f9 AG |
1563 | /** |
1564 | * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd | |
1565 | * for TMR CDBs | |
1566 | * | |
1567 | * @se_cmd: command descriptor to submit | |
1568 | * @se_sess: associated se_sess for endpoint | |
1569 | * @sense: pointer to SCSI sense buffer | |
1570 | * @unpacked_lun: unpacked LUN to reference for struct se_lun | |
1571 | * @fabric_context: fabric context for TMR req | |
1572 | * @tm_type: Type of TM request | |
c0974f89 NB |
1573 | * @gfp: gfp type for caller |
1574 | * @tag: referenced task tag for TMR_ABORT_TASK | |
c7042cae | 1575 | * @flags: submit cmd flags |
ea98d7f9 AG |
1576 | * |
1577 | * Callable from all contexts. | |
1578 | **/ | |
1579 | ||
c7042cae | 1580 | int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess, |
f2d30680 | 1581 | unsigned char *sense, u64 unpacked_lun, |
c0974f89 | 1582 | void *fabric_tmr_ptr, unsigned char tm_type, |
5261d86c | 1583 | gfp_t gfp, u64 tag, int flags) |
ea98d7f9 AG |
1584 | { |
1585 | struct se_portal_group *se_tpg; | |
1586 | int ret; | |
1587 | ||
1588 | se_tpg = se_sess->se_tpg; | |
1589 | BUG_ON(!se_tpg); | |
1590 | ||
1591 | transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, | |
68d81f40 | 1592 | 0, DMA_NONE, TCM_SIMPLE_TAG, sense); |
c7042cae NB |
1593 | /* |
1594 | * FIXME: Currently expect caller to handle se_cmd->se_tmr_req | |
1595 | * allocation failure. | |
1596 | */ | |
c0974f89 | 1597 | ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp); |
c7042cae NB |
1598 | if (ret < 0) |
1599 | return -ENOMEM; | |
ea98d7f9 | 1600 | |
c0974f89 NB |
1601 | if (tm_type == TMR_ABORT_TASK) |
1602 | se_cmd->se_tmr_req->ref_task_tag = tag; | |
1603 | ||
ea98d7f9 | 1604 | /* See target_submit_cmd for commentary */ |
afc16604 | 1605 | ret = target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF); |
bc187ea6 RD |
1606 | if (ret) { |
1607 | core_tmr_release_req(se_cmd->se_tmr_req); | |
1608 | return ret; | |
1609 | } | |
ea98d7f9 | 1610 | |
ea98d7f9 AG |
1611 | ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun); |
1612 | if (ret) { | |
9f0d05c2 NB |
1613 | /* |
1614 | * For callback during failure handling, push this work off | |
1615 | * to process context with TMR_LUN_DOES_NOT_EXIST status. | |
1616 | */ | |
1617 | INIT_WORK(&se_cmd->work, target_complete_tmr_failure); | |
1618 | schedule_work(&se_cmd->work); | |
c7042cae | 1619 | return 0; |
ea98d7f9 AG |
1620 | } |
1621 | transport_generic_handle_tmr(se_cmd); | |
c7042cae | 1622 | return 0; |
ea98d7f9 AG |
1623 | } |
1624 | EXPORT_SYMBOL(target_submit_tmr); | |
1625 | ||
c66ac9db NB |
1626 | /* |
1627 | * Handle SAM-esque emulation for generic transport request failures. | |
1628 | */ | |
de103c93 CH |
1629 | void transport_generic_request_failure(struct se_cmd *cmd, |
1630 | sense_reason_t sense_reason) | |
c66ac9db | 1631 | { |
057085e5 | 1632 | int ret = 0, post_ret = 0; |
07bde79a | 1633 | |
649ee054 BVA |
1634 | pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08llx" |
1635 | " CDB: 0x%02x\n", cmd, cmd->tag, cmd->t_task_cdb[0]); | |
de103c93 | 1636 | pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n", |
e3d6f909 | 1637 | cmd->se_tfo->get_cmd_state(cmd), |
de103c93 | 1638 | cmd->t_state, sense_reason); |
d43d6aea | 1639 | pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n", |
7d680f3b CH |
1640 | (cmd->transport_state & CMD_T_ACTIVE) != 0, |
1641 | (cmd->transport_state & CMD_T_STOP) != 0, | |
1642 | (cmd->transport_state & CMD_T_SENT) != 0); | |
c66ac9db | 1643 | |
c66ac9db NB |
1644 | /* |
1645 | * For SAM Task Attribute emulation for failed struct se_cmd | |
1646 | */ | |
019c4ca6 | 1647 | transport_complete_task_attr(cmd); |
cf6d1f09 NB |
1648 | /* |
1649 | * Handle special case for COMPARE_AND_WRITE failure, where the | |
c8e63985 | 1650 | * callback is expected to drop the per device ->caw_sem. |
cf6d1f09 NB |
1651 | */ |
1652 | if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) && | |
1653 | cmd->transport_complete_callback) | |
057085e5 | 1654 | cmd->transport_complete_callback(cmd, false, &post_ret); |
c66ac9db | 1655 | |
de103c93 | 1656 | switch (sense_reason) { |
03e98c9e NB |
1657 | case TCM_NON_EXISTENT_LUN: |
1658 | case TCM_UNSUPPORTED_SCSI_OPCODE: | |
1659 | case TCM_INVALID_CDB_FIELD: | |
1660 | case TCM_INVALID_PARAMETER_LIST: | |
bb992e72 | 1661 | case TCM_PARAMETER_LIST_LENGTH_ERROR: |
03e98c9e NB |
1662 | case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE: |
1663 | case TCM_UNKNOWN_MODE_PAGE: | |
1664 | case TCM_WRITE_PROTECTED: | |
e2397c70 | 1665 | case TCM_ADDRESS_OUT_OF_RANGE: |
03e98c9e NB |
1666 | case TCM_CHECK_CONDITION_ABORT_CMD: |
1667 | case TCM_CHECK_CONDITION_UNIT_ATTENTION: | |
1668 | case TCM_CHECK_CONDITION_NOT_READY: | |
94387aa7 NB |
1669 | case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED: |
1670 | case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED: | |
1671 | case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED: | |
c66ac9db | 1672 | break; |
de103c93 CH |
1673 | case TCM_OUT_OF_RESOURCES: |
1674 | sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
1675 | break; | |
03e98c9e | 1676 | case TCM_RESERVATION_CONFLICT: |
c66ac9db NB |
1677 | /* |
1678 | * No SENSE Data payload for this case, set SCSI Status | |
1679 | * and queue the response to $FABRIC_MOD. | |
1680 | * | |
1681 | * Uses linux/include/scsi/scsi.h SAM status codes defs | |
1682 | */ | |
1683 | cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT; | |
1684 | /* | |
1685 | * For UA Interlock Code 11b, a RESERVATION CONFLICT will | |
1686 | * establish a UNIT ATTENTION with PREVIOUS RESERVATION | |
1687 | * CONFLICT STATUS. | |
1688 | * | |
1689 | * See spc4r17, section 7.4.6 Control Mode Page, Table 349 | |
1690 | */ | |
e3d6f909 | 1691 | if (cmd->se_sess && |
c51c8e7b HR |
1692 | cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2) { |
1693 | target_ua_allocate_lun(cmd->se_sess->se_node_acl, | |
1694 | cmd->orig_fe_lun, 0x2C, | |
1695 | ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS); | |
1696 | } | |
e5c0d6ad | 1697 | trace_target_cmd_complete(cmd); |
c51c8e7b | 1698 | ret = cmd->se_tfo->queue_status(cmd); |
f147abb4 | 1699 | if (ret == -EAGAIN || ret == -ENOMEM) |
07bde79a | 1700 | goto queue_full; |
c66ac9db | 1701 | goto check_stop; |
c66ac9db | 1702 | default: |
6708bb27 | 1703 | pr_err("Unknown transport error for CDB 0x%02x: %d\n", |
de103c93 CH |
1704 | cmd->t_task_cdb[0], sense_reason); |
1705 | sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; | |
c66ac9db NB |
1706 | break; |
1707 | } | |
f3146437 | 1708 | |
de103c93 | 1709 | ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0); |
03e98c9e NB |
1710 | if (ret == -EAGAIN || ret == -ENOMEM) |
1711 | goto queue_full; | |
07bde79a | 1712 | |
c66ac9db NB |
1713 | check_stop: |
1714 | transport_lun_remove_cmd(cmd); | |
06b967e4 | 1715 | transport_cmd_check_stop_to_fabric(cmd); |
07bde79a NB |
1716 | return; |
1717 | ||
1718 | queue_full: | |
e057f533 CH |
1719 | cmd->t_state = TRANSPORT_COMPLETE_QF_OK; |
1720 | transport_handle_queue_full(cmd, cmd->se_dev); | |
c66ac9db | 1721 | } |
2fbff127 | 1722 | EXPORT_SYMBOL(transport_generic_request_failure); |
c66ac9db | 1723 | |
76dde50e | 1724 | void __target_execute_cmd(struct se_cmd *cmd) |
c66ac9db | 1725 | { |
de103c93 | 1726 | sense_reason_t ret; |
5f41a31d | 1727 | |
de103c93 CH |
1728 | if (cmd->execute_cmd) { |
1729 | ret = cmd->execute_cmd(cmd); | |
1730 | if (ret) { | |
1731 | spin_lock_irq(&cmd->t_state_lock); | |
1732 | cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT); | |
1733 | spin_unlock_irq(&cmd->t_state_lock); | |
5f41a31d | 1734 | |
de103c93 CH |
1735 | transport_generic_request_failure(cmd, ret); |
1736 | } | |
5f41a31d CH |
1737 | } |
1738 | } | |
1739 | ||
aa58b531 NB |
1740 | static int target_write_prot_action(struct se_cmd *cmd) |
1741 | { | |
5132d1e6 | 1742 | u32 sectors; |
aa58b531 NB |
1743 | /* |
1744 | * Perform WRITE_INSERT of PI using software emulation when backend | |
1745 | * device has PI enabled, if the transport has not already generated | |
1746 | * PI using hardware WRITE_INSERT offload. | |
1747 | */ | |
1748 | switch (cmd->prot_op) { | |
1749 | case TARGET_PROT_DOUT_INSERT: | |
1750 | if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_INSERT)) | |
1751 | sbc_dif_generate(cmd); | |
1752 | break; | |
5132d1e6 NB |
1753 | case TARGET_PROT_DOUT_STRIP: |
1754 | if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_STRIP) | |
1755 | break; | |
1756 | ||
1757 | sectors = cmd->data_length >> ilog2(cmd->se_dev->dev_attrib.block_size); | |
f75b6fae SG |
1758 | cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba, |
1759 | sectors, 0, cmd->t_prot_sg, 0); | |
5132d1e6 NB |
1760 | if (unlikely(cmd->pi_err)) { |
1761 | spin_lock_irq(&cmd->t_state_lock); | |
6c2faeaa | 1762 | cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT); |
5132d1e6 NB |
1763 | spin_unlock_irq(&cmd->t_state_lock); |
1764 | transport_generic_request_failure(cmd, cmd->pi_err); | |
1765 | return -1; | |
1766 | } | |
1767 | break; | |
aa58b531 NB |
1768 | default: |
1769 | break; | |
1770 | } | |
1771 | ||
1772 | return 0; | |
1773 | } | |
1774 | ||
019c4ca6 | 1775 | static bool target_handle_task_attr(struct se_cmd *cmd) |
5f41a31d CH |
1776 | { |
1777 | struct se_device *dev = cmd->se_dev; | |
1778 | ||
a3541703 | 1779 | if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH) |
019c4ca6 | 1780 | return false; |
5f41a31d | 1781 | |
c66ac9db | 1782 | /* |
25985edc | 1783 | * Check for the existence of HEAD_OF_QUEUE, and if true return 1 |
c66ac9db NB |
1784 | * to allow the passed struct se_cmd list of tasks to the front of the list. |
1785 | */ | |
5f41a31d | 1786 | switch (cmd->sam_task_attr) { |
68d81f40 | 1787 | case TCM_HEAD_TAG: |
9c31820b RD |
1788 | pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x\n", |
1789 | cmd->t_task_cdb[0]); | |
019c4ca6 | 1790 | return false; |
68d81f40 | 1791 | case TCM_ORDERED_TAG: |
33940d09 | 1792 | atomic_inc_mb(&dev->dev_ordered_sync); |
c66ac9db | 1793 | |
9c31820b RD |
1794 | pr_debug("Added ORDERED for CDB: 0x%02x to ordered list\n", |
1795 | cmd->t_task_cdb[0]); | |
5f41a31d | 1796 | |
c66ac9db | 1797 | /* |
5f41a31d CH |
1798 | * Execute an ORDERED command if no other older commands |
1799 | * exist that need to be completed first. | |
c66ac9db | 1800 | */ |
5f41a31d | 1801 | if (!atomic_read(&dev->simple_cmds)) |
019c4ca6 | 1802 | return false; |
5f41a31d CH |
1803 | break; |
1804 | default: | |
c66ac9db NB |
1805 | /* |
1806 | * For SIMPLE and UNTAGGED Task Attribute commands | |
1807 | */ | |
33940d09 | 1808 | atomic_inc_mb(&dev->simple_cmds); |
5f41a31d | 1809 | break; |
c66ac9db | 1810 | } |
5f41a31d | 1811 | |
019c4ca6 CH |
1812 | if (atomic_read(&dev->dev_ordered_sync) == 0) |
1813 | return false; | |
c66ac9db | 1814 | |
019c4ca6 CH |
1815 | spin_lock(&dev->delayed_cmd_lock); |
1816 | list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list); | |
1817 | spin_unlock(&dev->delayed_cmd_lock); | |
1818 | ||
9c31820b RD |
1819 | pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to delayed CMD listn", |
1820 | cmd->t_task_cdb[0], cmd->sam_task_attr); | |
019c4ca6 CH |
1821 | return true; |
1822 | } | |
1823 | ||
310d3d31 NB |
1824 | static int __transport_check_aborted_status(struct se_cmd *, int); |
1825 | ||
019c4ca6 CH |
1826 | void target_execute_cmd(struct se_cmd *cmd) |
1827 | { | |
019c4ca6 CH |
1828 | /* |
1829 | * Determine if frontend context caller is requesting the stopping of | |
1830 | * this command for frontend exceptions. | |
310d3d31 NB |
1831 | * |
1832 | * If the received CDB has aleady been aborted stop processing it here. | |
019c4ca6 | 1833 | */ |
4a9a6c8d | 1834 | spin_lock_irq(&cmd->t_state_lock); |
310d3d31 NB |
1835 | if (__transport_check_aborted_status(cmd, 1)) { |
1836 | spin_unlock_irq(&cmd->t_state_lock); | |
1837 | return; | |
1838 | } | |
019c4ca6 | 1839 | if (cmd->transport_state & CMD_T_STOP) { |
649ee054 BVA |
1840 | pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n", |
1841 | __func__, __LINE__, cmd->tag); | |
019c4ca6 CH |
1842 | |
1843 | spin_unlock_irq(&cmd->t_state_lock); | |
a95d6511 | 1844 | complete_all(&cmd->t_transport_stop_comp); |
019c4ca6 CH |
1845 | return; |
1846 | } | |
1847 | ||
1848 | cmd->t_state = TRANSPORT_PROCESSING; | |
1a398b97 | 1849 | cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT; |
019c4ca6 | 1850 | spin_unlock_irq(&cmd->t_state_lock); |
aa58b531 NB |
1851 | |
1852 | if (target_write_prot_action(cmd)) | |
1853 | return; | |
019c4ca6 | 1854 | |
1a398b97 NB |
1855 | if (target_handle_task_attr(cmd)) { |
1856 | spin_lock_irq(&cmd->t_state_lock); | |
6c2faeaa | 1857 | cmd->transport_state &= ~(CMD_T_BUSY | CMD_T_SENT); |
1a398b97 NB |
1858 | spin_unlock_irq(&cmd->t_state_lock); |
1859 | return; | |
1860 | } | |
1861 | ||
1862 | __target_execute_cmd(cmd); | |
c66ac9db | 1863 | } |
70baf0ab | 1864 | EXPORT_SYMBOL(target_execute_cmd); |
c66ac9db | 1865 | |
5f41a31d CH |
1866 | /* |
1867 | * Process all commands up to the last received ORDERED task attribute which | |
1868 | * requires another blocking boundary | |
1869 | */ | |
1870 | static void target_restart_delayed_cmds(struct se_device *dev) | |
1871 | { | |
1872 | for (;;) { | |
1873 | struct se_cmd *cmd; | |
1874 | ||
1875 | spin_lock(&dev->delayed_cmd_lock); | |
1876 | if (list_empty(&dev->delayed_cmd_list)) { | |
1877 | spin_unlock(&dev->delayed_cmd_lock); | |
1878 | break; | |
1879 | } | |
1880 | ||
1881 | cmd = list_entry(dev->delayed_cmd_list.next, | |
1882 | struct se_cmd, se_delayed_node); | |
1883 | list_del(&cmd->se_delayed_node); | |
1884 | spin_unlock(&dev->delayed_cmd_lock); | |
1885 | ||
1886 | __target_execute_cmd(cmd); | |
1887 | ||
68d81f40 | 1888 | if (cmd->sam_task_attr == TCM_ORDERED_TAG) |
5f41a31d CH |
1889 | break; |
1890 | } | |
1891 | } | |
1892 | ||
c66ac9db | 1893 | /* |
35e0e757 | 1894 | * Called from I/O completion to determine which dormant/delayed |
c66ac9db NB |
1895 | * and ordered cmds need to have their tasks added to the execution queue. |
1896 | */ | |
1897 | static void transport_complete_task_attr(struct se_cmd *cmd) | |
1898 | { | |
5951146d | 1899 | struct se_device *dev = cmd->se_dev; |
c66ac9db | 1900 | |
a3541703 | 1901 | if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH) |
019c4ca6 CH |
1902 | return; |
1903 | ||
68d81f40 | 1904 | if (cmd->sam_task_attr == TCM_SIMPLE_TAG) { |
33940d09 | 1905 | atomic_dec_mb(&dev->simple_cmds); |
c66ac9db | 1906 | dev->dev_cur_ordered_id++; |
9c31820b RD |
1907 | pr_debug("Incremented dev->dev_cur_ordered_id: %u for SIMPLE\n", |
1908 | dev->dev_cur_ordered_id); | |
68d81f40 | 1909 | } else if (cmd->sam_task_attr == TCM_HEAD_TAG) { |
c66ac9db | 1910 | dev->dev_cur_ordered_id++; |
9c31820b RD |
1911 | pr_debug("Incremented dev_cur_ordered_id: %u for HEAD_OF_QUEUE\n", |
1912 | dev->dev_cur_ordered_id); | |
68d81f40 | 1913 | } else if (cmd->sam_task_attr == TCM_ORDERED_TAG) { |
33940d09 | 1914 | atomic_dec_mb(&dev->dev_ordered_sync); |
c66ac9db NB |
1915 | |
1916 | dev->dev_cur_ordered_id++; | |
9c31820b RD |
1917 | pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED\n", |
1918 | dev->dev_cur_ordered_id); | |
c66ac9db | 1919 | } |
c66ac9db | 1920 | |
5f41a31d | 1921 | target_restart_delayed_cmds(dev); |
c66ac9db NB |
1922 | } |
1923 | ||
e057f533 | 1924 | static void transport_complete_qf(struct se_cmd *cmd) |
07bde79a NB |
1925 | { |
1926 | int ret = 0; | |
1927 | ||
019c4ca6 | 1928 | transport_complete_task_attr(cmd); |
e057f533 CH |
1929 | |
1930 | if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) { | |
e5c0d6ad | 1931 | trace_target_cmd_complete(cmd); |
e057f533 | 1932 | ret = cmd->se_tfo->queue_status(cmd); |
082f58ac | 1933 | goto out; |
e057f533 | 1934 | } |
07bde79a NB |
1935 | |
1936 | switch (cmd->data_direction) { | |
1937 | case DMA_FROM_DEVICE: | |
e5c0d6ad | 1938 | trace_target_cmd_complete(cmd); |
07bde79a NB |
1939 | ret = cmd->se_tfo->queue_data_in(cmd); |
1940 | break; | |
1941 | case DMA_TO_DEVICE: | |
64577407 | 1942 | if (cmd->se_cmd_flags & SCF_BIDI) { |
07bde79a | 1943 | ret = cmd->se_tfo->queue_data_in(cmd); |
63509c60 | 1944 | break; |
07bde79a NB |
1945 | } |
1946 | /* Fall through for DMA_TO_DEVICE */ | |
1947 | case DMA_NONE: | |
e5c0d6ad | 1948 | trace_target_cmd_complete(cmd); |
07bde79a NB |
1949 | ret = cmd->se_tfo->queue_status(cmd); |
1950 | break; | |
1951 | default: | |
1952 | break; | |
1953 | } | |
1954 | ||
e057f533 CH |
1955 | out: |
1956 | if (ret < 0) { | |
1957 | transport_handle_queue_full(cmd, cmd->se_dev); | |
1958 | return; | |
1959 | } | |
1960 | transport_lun_remove_cmd(cmd); | |
1961 | transport_cmd_check_stop_to_fabric(cmd); | |
07bde79a NB |
1962 | } |
1963 | ||
1964 | static void transport_handle_queue_full( | |
1965 | struct se_cmd *cmd, | |
e057f533 | 1966 | struct se_device *dev) |
07bde79a NB |
1967 | { |
1968 | spin_lock_irq(&dev->qf_cmd_lock); | |
07bde79a | 1969 | list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list); |
33940d09 | 1970 | atomic_inc_mb(&dev->dev_qf_count); |
07bde79a NB |
1971 | spin_unlock_irq(&cmd->se_dev->qf_cmd_lock); |
1972 | ||
1973 | schedule_work(&cmd->se_dev->qf_work_queue); | |
1974 | } | |
1975 | ||
fdeab852 | 1976 | static bool target_read_prot_action(struct se_cmd *cmd) |
bc005869 | 1977 | { |
fdeab852 NB |
1978 | switch (cmd->prot_op) { |
1979 | case TARGET_PROT_DIN_STRIP: | |
1980 | if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_STRIP)) { | |
f75b6fae SG |
1981 | u32 sectors = cmd->data_length >> |
1982 | ilog2(cmd->se_dev->dev_attrib.block_size); | |
1983 | ||
1984 | cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba, | |
1985 | sectors, 0, cmd->t_prot_sg, | |
1986 | 0); | |
1987 | if (cmd->pi_err) | |
fdeab852 | 1988 | return true; |
bc005869 | 1989 | } |
fdeab852 | 1990 | break; |
72c03850 NB |
1991 | case TARGET_PROT_DIN_INSERT: |
1992 | if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_INSERT) | |
1993 | break; | |
1994 | ||
1995 | sbc_dif_generate(cmd); | |
1996 | break; | |
fdeab852 NB |
1997 | default: |
1998 | break; | |
bc005869 NB |
1999 | } |
2000 | ||
2001 | return false; | |
2002 | } | |
2003 | ||
35e0e757 | 2004 | static void target_complete_ok_work(struct work_struct *work) |
c66ac9db | 2005 | { |
35e0e757 | 2006 | struct se_cmd *cmd = container_of(work, struct se_cmd, work); |
27a27099 | 2007 | int ret; |
35e0e757 | 2008 | |
c66ac9db NB |
2009 | /* |
2010 | * Check if we need to move delayed/dormant tasks from cmds on the | |
2011 | * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task | |
2012 | * Attribute. | |
2013 | */ | |
019c4ca6 CH |
2014 | transport_complete_task_attr(cmd); |
2015 | ||
07bde79a NB |
2016 | /* |
2017 | * Check to schedule QUEUE_FULL work, or execute an existing | |
2018 | * cmd->transport_qf_callback() | |
2019 | */ | |
2020 | if (atomic_read(&cmd->se_dev->dev_qf_count) != 0) | |
2021 | schedule_work(&cmd->se_dev->qf_work_queue); | |
2022 | ||
c66ac9db | 2023 | /* |
d5829eac | 2024 | * Check if we need to send a sense buffer from |
c66ac9db NB |
2025 | * the struct se_cmd in question. |
2026 | */ | |
2027 | if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) { | |
27a27099 | 2028 | WARN_ON(!cmd->scsi_status); |
27a27099 PB |
2029 | ret = transport_send_check_condition_and_sense( |
2030 | cmd, 0, 1); | |
2031 | if (ret == -EAGAIN || ret == -ENOMEM) | |
2032 | goto queue_full; | |
2033 | ||
2034 | transport_lun_remove_cmd(cmd); | |
2035 | transport_cmd_check_stop_to_fabric(cmd); | |
2036 | return; | |
c66ac9db NB |
2037 | } |
2038 | /* | |
25985edc | 2039 | * Check for a callback, used by amongst other things |
a6b0133c | 2040 | * XDWRITE_READ_10 and COMPARE_AND_WRITE emulation. |
c66ac9db | 2041 | */ |
a6b0133c NB |
2042 | if (cmd->transport_complete_callback) { |
2043 | sense_reason_t rc; | |
057085e5 NB |
2044 | bool caw = (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE); |
2045 | bool zero_dl = !(cmd->data_length); | |
2046 | int post_ret = 0; | |
a6b0133c | 2047 | |
057085e5 NB |
2048 | rc = cmd->transport_complete_callback(cmd, true, &post_ret); |
2049 | if (!rc && !post_ret) { | |
2050 | if (caw && zero_dl) | |
c8e63985 NB |
2051 | goto queue_rsp; |
2052 | ||
a6b0133c | 2053 | return; |
a2890087 NB |
2054 | } else if (rc) { |
2055 | ret = transport_send_check_condition_and_sense(cmd, | |
2056 | rc, 0); | |
2057 | if (ret == -EAGAIN || ret == -ENOMEM) | |
2058 | goto queue_full; | |
a6b0133c | 2059 | |
a2890087 NB |
2060 | transport_lun_remove_cmd(cmd); |
2061 | transport_cmd_check_stop_to_fabric(cmd); | |
2062 | return; | |
2063 | } | |
a6b0133c | 2064 | } |
c66ac9db | 2065 | |
c8e63985 | 2066 | queue_rsp: |
c66ac9db NB |
2067 | switch (cmd->data_direction) { |
2068 | case DMA_FROM_DEVICE: | |
4cc987ea NB |
2069 | atomic_long_add(cmd->data_length, |
2070 | &cmd->se_lun->lun_stats.tx_data_octets); | |
bc005869 NB |
2071 | /* |
2072 | * Perform READ_STRIP of PI using software emulation when | |
2073 | * backend had PI enabled, if the transport will not be | |
2074 | * performing hardware READ_STRIP offload. | |
2075 | */ | |
fdeab852 | 2076 | if (target_read_prot_action(cmd)) { |
bc005869 NB |
2077 | ret = transport_send_check_condition_and_sense(cmd, |
2078 | cmd->pi_err, 0); | |
2079 | if (ret == -EAGAIN || ret == -ENOMEM) | |
2080 | goto queue_full; | |
2081 | ||
2082 | transport_lun_remove_cmd(cmd); | |
2083 | transport_cmd_check_stop_to_fabric(cmd); | |
2084 | return; | |
2085 | } | |
c66ac9db | 2086 | |
e5c0d6ad | 2087 | trace_target_cmd_complete(cmd); |
07bde79a | 2088 | ret = cmd->se_tfo->queue_data_in(cmd); |
f147abb4 | 2089 | if (ret == -EAGAIN || ret == -ENOMEM) |
07bde79a | 2090 | goto queue_full; |
c66ac9db NB |
2091 | break; |
2092 | case DMA_TO_DEVICE: | |
4cc987ea NB |
2093 | atomic_long_add(cmd->data_length, |
2094 | &cmd->se_lun->lun_stats.rx_data_octets); | |
c66ac9db NB |
2095 | /* |
2096 | * Check if we need to send READ payload for BIDI-COMMAND | |
2097 | */ | |
64577407 | 2098 | if (cmd->se_cmd_flags & SCF_BIDI) { |
4cc987ea NB |
2099 | atomic_long_add(cmd->data_length, |
2100 | &cmd->se_lun->lun_stats.tx_data_octets); | |
07bde79a | 2101 | ret = cmd->se_tfo->queue_data_in(cmd); |
f147abb4 | 2102 | if (ret == -EAGAIN || ret == -ENOMEM) |
07bde79a | 2103 | goto queue_full; |
c66ac9db NB |
2104 | break; |
2105 | } | |
2106 | /* Fall through for DMA_TO_DEVICE */ | |
2107 | case DMA_NONE: | |
e5c0d6ad | 2108 | trace_target_cmd_complete(cmd); |
07bde79a | 2109 | ret = cmd->se_tfo->queue_status(cmd); |
f147abb4 | 2110 | if (ret == -EAGAIN || ret == -ENOMEM) |
07bde79a | 2111 | goto queue_full; |
c66ac9db NB |
2112 | break; |
2113 | default: | |
2114 | break; | |
2115 | } | |
2116 | ||
2117 | transport_lun_remove_cmd(cmd); | |
2118 | transport_cmd_check_stop_to_fabric(cmd); | |
07bde79a NB |
2119 | return; |
2120 | ||
2121 | queue_full: | |
6708bb27 | 2122 | pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p," |
07bde79a | 2123 | " data_direction: %d\n", cmd, cmd->data_direction); |
e057f533 CH |
2124 | cmd->t_state = TRANSPORT_COMPLETE_QF_OK; |
2125 | transport_handle_queue_full(cmd, cmd->se_dev); | |
c66ac9db NB |
2126 | } |
2127 | ||
6708bb27 | 2128 | static inline void transport_free_sgl(struct scatterlist *sgl, int nents) |
c66ac9db | 2129 | { |
ec98f782 | 2130 | struct scatterlist *sg; |
ec98f782 | 2131 | int count; |
c66ac9db | 2132 | |
6708bb27 AG |
2133 | for_each_sg(sgl, sg, nents, count) |
2134 | __free_page(sg_page(sg)); | |
c66ac9db | 2135 | |
6708bb27 AG |
2136 | kfree(sgl); |
2137 | } | |
c66ac9db | 2138 | |
47e459e6 NB |
2139 | static inline void transport_reset_sgl_orig(struct se_cmd *cmd) |
2140 | { | |
2141 | /* | |
2142 | * Check for saved t_data_sg that may be used for COMPARE_AND_WRITE | |
2143 | * emulation, and free + reset pointers if necessary.. | |
2144 | */ | |
2145 | if (!cmd->t_data_sg_orig) | |
2146 | return; | |
2147 | ||
2148 | kfree(cmd->t_data_sg); | |
2149 | cmd->t_data_sg = cmd->t_data_sg_orig; | |
2150 | cmd->t_data_sg_orig = NULL; | |
2151 | cmd->t_data_nents = cmd->t_data_nents_orig; | |
2152 | cmd->t_data_nents_orig = 0; | |
2153 | } | |
2154 | ||
6708bb27 AG |
2155 | static inline void transport_free_pages(struct se_cmd *cmd) |
2156 | { | |
5835812f AM |
2157 | if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) { |
2158 | transport_free_sgl(cmd->t_prot_sg, cmd->t_prot_nents); | |
2159 | cmd->t_prot_sg = NULL; | |
2160 | cmd->t_prot_nents = 0; | |
2161 | } | |
2162 | ||
47e459e6 | 2163 | if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) { |
c8e63985 NB |
2164 | /* |
2165 | * Release special case READ buffer payload required for | |
2166 | * SG_TO_MEM_NOALLOC to function with COMPARE_AND_WRITE | |
2167 | */ | |
2168 | if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) { | |
2169 | transport_free_sgl(cmd->t_bidi_data_sg, | |
2170 | cmd->t_bidi_data_nents); | |
2171 | cmd->t_bidi_data_sg = NULL; | |
2172 | cmd->t_bidi_data_nents = 0; | |
2173 | } | |
47e459e6 | 2174 | transport_reset_sgl_orig(cmd); |
6708bb27 | 2175 | return; |
47e459e6 NB |
2176 | } |
2177 | transport_reset_sgl_orig(cmd); | |
6708bb27 AG |
2178 | |
2179 | transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents); | |
ec98f782 AG |
2180 | cmd->t_data_sg = NULL; |
2181 | cmd->t_data_nents = 0; | |
c66ac9db | 2182 | |
6708bb27 | 2183 | transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents); |
ec98f782 AG |
2184 | cmd->t_bidi_data_sg = NULL; |
2185 | cmd->t_bidi_data_nents = 0; | |
c66ac9db NB |
2186 | } |
2187 | ||
e26d99ae | 2188 | /** |
febe562c NB |
2189 | * transport_put_cmd - release a reference to a command |
2190 | * @cmd: command to release | |
e26d99ae | 2191 | * |
febe562c | 2192 | * This routine releases our reference to the command and frees it if possible. |
e26d99ae | 2193 | */ |
febe562c | 2194 | static int transport_put_cmd(struct se_cmd *cmd) |
e26d99ae CH |
2195 | { |
2196 | BUG_ON(!cmd->se_tfo); | |
e26d99ae | 2197 | /* |
7481deb4 NB |
2198 | * If this cmd has been setup with target_get_sess_cmd(), drop |
2199 | * the kref and call ->release_cmd() in kref callback. | |
e26d99ae | 2200 | */ |
afc16604 | 2201 | return target_put_sess_cmd(cmd); |
e26d99ae CH |
2202 | } |
2203 | ||
4949314c | 2204 | void *transport_kmap_data_sg(struct se_cmd *cmd) |
05d1c7c0 | 2205 | { |
ec98f782 | 2206 | struct scatterlist *sg = cmd->t_data_sg; |
4949314c AG |
2207 | struct page **pages; |
2208 | int i; | |
05d1c7c0 AG |
2209 | |
2210 | /* | |
ec98f782 AG |
2211 | * We need to take into account a possible offset here for fabrics like |
2212 | * tcm_loop who may be using a contig buffer from the SCSI midlayer for | |
2213 | * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd() | |
05d1c7c0 | 2214 | */ |
4949314c AG |
2215 | if (!cmd->t_data_nents) |
2216 | return NULL; | |
3717ef0c PB |
2217 | |
2218 | BUG_ON(!sg); | |
2219 | if (cmd->t_data_nents == 1) | |
4949314c AG |
2220 | return kmap(sg_page(sg)) + sg->offset; |
2221 | ||
2222 | /* >1 page. use vmap */ | |
2223 | pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL); | |
de103c93 | 2224 | if (!pages) |
4949314c AG |
2225 | return NULL; |
2226 | ||
2227 | /* convert sg[] to pages[] */ | |
2228 | for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) { | |
2229 | pages[i] = sg_page(sg); | |
2230 | } | |
2231 | ||
2232 | cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL); | |
2233 | kfree(pages); | |
de103c93 | 2234 | if (!cmd->t_data_vmap) |
4949314c AG |
2235 | return NULL; |
2236 | ||
2237 | return cmd->t_data_vmap + cmd->t_data_sg[0].offset; | |
05d1c7c0 | 2238 | } |
4949314c | 2239 | EXPORT_SYMBOL(transport_kmap_data_sg); |
05d1c7c0 | 2240 | |
4949314c | 2241 | void transport_kunmap_data_sg(struct se_cmd *cmd) |
05d1c7c0 | 2242 | { |
a1edf9cf | 2243 | if (!cmd->t_data_nents) { |
4949314c | 2244 | return; |
a1edf9cf | 2245 | } else if (cmd->t_data_nents == 1) { |
4949314c | 2246 | kunmap(sg_page(cmd->t_data_sg)); |
a1edf9cf AG |
2247 | return; |
2248 | } | |
4949314c AG |
2249 | |
2250 | vunmap(cmd->t_data_vmap); | |
2251 | cmd->t_data_vmap = NULL; | |
05d1c7c0 | 2252 | } |
4949314c | 2253 | EXPORT_SYMBOL(transport_kunmap_data_sg); |
05d1c7c0 | 2254 | |
c5ff8d6b | 2255 | int |
20093994 NB |
2256 | target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, u32 length, |
2257 | bool zero_page) | |
c66ac9db | 2258 | { |
20093994 | 2259 | struct scatterlist *sg; |
ec98f782 | 2260 | struct page *page; |
20093994 NB |
2261 | gfp_t zero_flag = (zero_page) ? __GFP_ZERO : 0; |
2262 | unsigned int nent; | |
ec98f782 | 2263 | int i = 0; |
c66ac9db | 2264 | |
20093994 NB |
2265 | nent = DIV_ROUND_UP(length, PAGE_SIZE); |
2266 | sg = kmalloc(sizeof(struct scatterlist) * nent, GFP_KERNEL); | |
2267 | if (!sg) | |
ec98f782 | 2268 | return -ENOMEM; |
c66ac9db | 2269 | |
20093994 | 2270 | sg_init_table(sg, nent); |
9db9da33 | 2271 | |
ec98f782 AG |
2272 | while (length) { |
2273 | u32 page_len = min_t(u32, length, PAGE_SIZE); | |
9db9da33 | 2274 | page = alloc_page(GFP_KERNEL | zero_flag); |
ec98f782 AG |
2275 | if (!page) |
2276 | goto out; | |
c66ac9db | 2277 | |
20093994 | 2278 | sg_set_page(&sg[i], page, page_len, 0); |
ec98f782 AG |
2279 | length -= page_len; |
2280 | i++; | |
c66ac9db | 2281 | } |
20093994 NB |
2282 | *sgl = sg; |
2283 | *nents = nent; | |
c66ac9db | 2284 | return 0; |
c66ac9db | 2285 | |
ec98f782 | 2286 | out: |
d0e27c88 | 2287 | while (i > 0) { |
ec98f782 | 2288 | i--; |
20093994 | 2289 | __free_page(sg_page(&sg[i])); |
c66ac9db | 2290 | } |
20093994 | 2291 | kfree(sg); |
ec98f782 | 2292 | return -ENOMEM; |
c66ac9db NB |
2293 | } |
2294 | ||
da0f7619 | 2295 | /* |
b16a35b0 AG |
2296 | * Allocate any required resources to execute the command. For writes we |
2297 | * might not have the payload yet, so notify the fabric via a call to | |
2298 | * ->write_pending instead. Otherwise place it on the execution queue. | |
c66ac9db | 2299 | */ |
de103c93 CH |
2300 | sense_reason_t |
2301 | transport_generic_new_cmd(struct se_cmd *cmd) | |
c66ac9db | 2302 | { |
c66ac9db | 2303 | int ret = 0; |
c8e63985 | 2304 | bool zero_flag = !(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB); |
c66ac9db | 2305 | |
5835812f AM |
2306 | if (cmd->prot_op != TARGET_PROT_NORMAL && |
2307 | !(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) { | |
2308 | ret = target_alloc_sgl(&cmd->t_prot_sg, &cmd->t_prot_nents, | |
2309 | cmd->prot_length, true); | |
2310 | if (ret < 0) | |
2311 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
2312 | } | |
2313 | ||
c66ac9db NB |
2314 | /* |
2315 | * Determine is the TCM fabric module has already allocated physical | |
2316 | * memory, and is directly calling transport_generic_map_mem_to_cmd() | |
ec98f782 | 2317 | * beforehand. |
c66ac9db | 2318 | */ |
ec98f782 AG |
2319 | if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) && |
2320 | cmd->data_length) { | |
20093994 | 2321 | |
8cefe07b NB |
2322 | if ((cmd->se_cmd_flags & SCF_BIDI) || |
2323 | (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) { | |
2324 | u32 bidi_length; | |
2325 | ||
2326 | if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) | |
2327 | bidi_length = cmd->t_task_nolb * | |
2328 | cmd->se_dev->dev_attrib.block_size; | |
2329 | else | |
2330 | bidi_length = cmd->data_length; | |
2331 | ||
2332 | ret = target_alloc_sgl(&cmd->t_bidi_data_sg, | |
2333 | &cmd->t_bidi_data_nents, | |
2334 | bidi_length, zero_flag); | |
2335 | if (ret < 0) | |
2336 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
2337 | } | |
2338 | ||
20093994 NB |
2339 | ret = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents, |
2340 | cmd->data_length, zero_flag); | |
c66ac9db | 2341 | if (ret < 0) |
de103c93 | 2342 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
c8e63985 NB |
2343 | } else if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) && |
2344 | cmd->data_length) { | |
2345 | /* | |
2346 | * Special case for COMPARE_AND_WRITE with fabrics | |
2347 | * using SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC. | |
2348 | */ | |
2349 | u32 caw_length = cmd->t_task_nolb * | |
2350 | cmd->se_dev->dev_attrib.block_size; | |
2351 | ||
2352 | ret = target_alloc_sgl(&cmd->t_bidi_data_sg, | |
2353 | &cmd->t_bidi_data_nents, | |
2354 | caw_length, zero_flag); | |
2355 | if (ret < 0) | |
2356 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
c66ac9db | 2357 | } |
c66ac9db | 2358 | /* |
c3196f0c CH |
2359 | * If this command is not a write we can execute it right here, |
2360 | * for write buffers we need to notify the fabric driver first | |
2361 | * and let it call back once the write buffers are ready. | |
c66ac9db | 2362 | */ |
5f41a31d | 2363 | target_add_to_state_list(cmd); |
885e7b0e | 2364 | if (cmd->data_direction != DMA_TO_DEVICE || cmd->data_length == 0) { |
c3196f0c CH |
2365 | target_execute_cmd(cmd); |
2366 | return 0; | |
2367 | } | |
862e6389 | 2368 | transport_cmd_check_stop(cmd, false, true); |
c3196f0c CH |
2369 | |
2370 | ret = cmd->se_tfo->write_pending(cmd); | |
2371 | if (ret == -EAGAIN || ret == -ENOMEM) | |
2372 | goto queue_full; | |
2373 | ||
de103c93 CH |
2374 | /* fabric drivers should only return -EAGAIN or -ENOMEM as error */ |
2375 | WARN_ON(ret); | |
2376 | ||
b69c1fcf | 2377 | return (!ret) ? 0 : TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
da0f7619 | 2378 | |
c3196f0c CH |
2379 | queue_full: |
2380 | pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd); | |
2381 | cmd->t_state = TRANSPORT_COMPLETE_QF_WP; | |
2382 | transport_handle_queue_full(cmd, cmd->se_dev); | |
2383 | return 0; | |
c66ac9db | 2384 | } |
a1d8b49a | 2385 | EXPORT_SYMBOL(transport_generic_new_cmd); |
c66ac9db | 2386 | |
e057f533 | 2387 | static void transport_write_pending_qf(struct se_cmd *cmd) |
07bde79a | 2388 | { |
f147abb4 NB |
2389 | int ret; |
2390 | ||
2391 | ret = cmd->se_tfo->write_pending(cmd); | |
2392 | if (ret == -EAGAIN || ret == -ENOMEM) { | |
e057f533 CH |
2393 | pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", |
2394 | cmd); | |
2395 | transport_handle_queue_full(cmd, cmd->se_dev); | |
2396 | } | |
07bde79a NB |
2397 | } |
2398 | ||
0f4a9431 NB |
2399 | static bool |
2400 | __transport_wait_for_tasks(struct se_cmd *, bool, bool *, bool *, | |
2401 | unsigned long *flags); | |
2402 | ||
2403 | static void target_wait_free_cmd(struct se_cmd *cmd, bool *aborted, bool *tas) | |
2404 | { | |
2405 | unsigned long flags; | |
2406 | ||
2407 | spin_lock_irqsave(&cmd->t_state_lock, flags); | |
2408 | __transport_wait_for_tasks(cmd, true, aborted, tas, &flags); | |
2409 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
2410 | } | |
2411 | ||
d5ddad41 | 2412 | int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks) |
c66ac9db | 2413 | { |
d5ddad41 | 2414 | int ret = 0; |
0f4a9431 | 2415 | bool aborted = false, tas = false; |
d5ddad41 | 2416 | |
d14921d6 | 2417 | if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) { |
c8e31f26 | 2418 | if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) |
0f4a9431 | 2419 | target_wait_free_cmd(cmd, &aborted, &tas); |
d14921d6 | 2420 | |
0f4a9431 NB |
2421 | if (!aborted || tas) |
2422 | ret = transport_put_cmd(cmd); | |
d14921d6 NB |
2423 | } else { |
2424 | if (wait_for_tasks) | |
0f4a9431 | 2425 | target_wait_free_cmd(cmd, &aborted, &tas); |
c130480b NB |
2426 | /* |
2427 | * Handle WRITE failure case where transport_generic_new_cmd() | |
2428 | * has already added se_cmd to state_list, but fabric has | |
2429 | * failed command before I/O submission. | |
2430 | */ | |
febe562c | 2431 | if (cmd->state_active) |
c130480b | 2432 | target_remove_from_state_list(cmd); |
d14921d6 | 2433 | |
82f1c8a4 | 2434 | if (cmd->se_lun) |
c66ac9db | 2435 | transport_lun_remove_cmd(cmd); |
c66ac9db | 2436 | |
0f4a9431 NB |
2437 | if (!aborted || tas) |
2438 | ret = transport_put_cmd(cmd); | |
2439 | } | |
2440 | /* | |
2441 | * If the task has been internally aborted due to TMR ABORT_TASK | |
2442 | * or LUN_RESET, target_core_tmr.c is responsible for performing | |
2443 | * the remaining calls to target_put_sess_cmd(), and not the | |
2444 | * callers of this function. | |
2445 | */ | |
2446 | if (aborted) { | |
2447 | pr_debug("Detected CMD_T_ABORTED for ITT: %llu\n", cmd->tag); | |
2448 | wait_for_completion(&cmd->cmd_wait_comp); | |
2449 | cmd->se_tfo->release_cmd(cmd); | |
2450 | ret = 1; | |
c66ac9db | 2451 | } |
d5ddad41 | 2452 | return ret; |
c66ac9db NB |
2453 | } |
2454 | EXPORT_SYMBOL(transport_generic_free_cmd); | |
2455 | ||
a17f091d | 2456 | /* target_get_sess_cmd - Add command to active ->sess_cmd_list |
a17f091d | 2457 | * @se_cmd: command descriptor to add |
a6360785 | 2458 | * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd() |
a17f091d | 2459 | */ |
afc16604 | 2460 | int target_get_sess_cmd(struct se_cmd *se_cmd, bool ack_kref) |
a17f091d | 2461 | { |
afc16604 | 2462 | struct se_session *se_sess = se_cmd->se_sess; |
a17f091d | 2463 | unsigned long flags; |
bc187ea6 | 2464 | int ret = 0; |
a17f091d | 2465 | |
a6360785 NB |
2466 | /* |
2467 | * Add a second kref if the fabric caller is expecting to handle | |
2468 | * fabric acknowledgement that requires two target_put_sess_cmd() | |
2469 | * invocations before se_cmd descriptor release. | |
2470 | */ | |
054922bb | 2471 | if (ack_kref) |
a6360785 | 2472 | kref_get(&se_cmd->cmd_kref); |
7481deb4 | 2473 | |
a17f091d | 2474 | spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); |
bc187ea6 RD |
2475 | if (se_sess->sess_tearing_down) { |
2476 | ret = -ESHUTDOWN; | |
2477 | goto out; | |
2478 | } | |
a17f091d | 2479 | list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list); |
bc187ea6 | 2480 | out: |
a17f091d | 2481 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); |
7544e597 BVA |
2482 | |
2483 | if (ret && ack_kref) | |
afc16604 | 2484 | target_put_sess_cmd(se_cmd); |
7544e597 | 2485 | |
bc187ea6 | 2486 | return ret; |
a17f091d | 2487 | } |
20361e69 | 2488 | EXPORT_SYMBOL(target_get_sess_cmd); |
a17f091d | 2489 | |
febe562c NB |
2490 | static void target_free_cmd_mem(struct se_cmd *cmd) |
2491 | { | |
2492 | transport_free_pages(cmd); | |
2493 | ||
2494 | if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB) | |
2495 | core_tmr_release_req(cmd->se_tmr_req); | |
2496 | if (cmd->t_task_cdb != cmd->__t_task_cdb) | |
2497 | kfree(cmd->t_task_cdb); | |
2498 | } | |
2499 | ||
7481deb4 | 2500 | static void target_release_cmd_kref(struct kref *kref) |
a17f091d | 2501 | { |
7481deb4 NB |
2502 | struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref); |
2503 | struct se_session *se_sess = se_cmd->se_sess; | |
9ff9d15e | 2504 | unsigned long flags; |
0f4a9431 | 2505 | bool fabric_stop; |
a17f091d | 2506 | |
9ff9d15e | 2507 | spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); |
a17f091d | 2508 | if (list_empty(&se_cmd->se_cmd_list)) { |
9ff9d15e | 2509 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); |
febe562c | 2510 | target_free_cmd_mem(se_cmd); |
ffc32d52 | 2511 | se_cmd->se_tfo->release_cmd(se_cmd); |
7481deb4 | 2512 | return; |
a17f091d | 2513 | } |
0f4a9431 NB |
2514 | |
2515 | spin_lock(&se_cmd->t_state_lock); | |
2516 | fabric_stop = (se_cmd->transport_state & CMD_T_FABRIC_STOP); | |
2517 | spin_unlock(&se_cmd->t_state_lock); | |
2518 | ||
2519 | if (se_cmd->cmd_wait_set || fabric_stop) { | |
2520 | list_del_init(&se_cmd->se_cmd_list); | |
9ff9d15e | 2521 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); |
febe562c | 2522 | target_free_cmd_mem(se_cmd); |
a17f091d | 2523 | complete(&se_cmd->cmd_wait_comp); |
7481deb4 | 2524 | return; |
a17f091d | 2525 | } |
0f4a9431 | 2526 | list_del_init(&se_cmd->se_cmd_list); |
9ff9d15e | 2527 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); |
a17f091d | 2528 | |
febe562c | 2529 | target_free_cmd_mem(se_cmd); |
7481deb4 NB |
2530 | se_cmd->se_tfo->release_cmd(se_cmd); |
2531 | } | |
2532 | ||
2533 | /* target_put_sess_cmd - Check for active I/O shutdown via kref_put | |
7481deb4 NB |
2534 | * @se_cmd: command descriptor to drop |
2535 | */ | |
afc16604 | 2536 | int target_put_sess_cmd(struct se_cmd *se_cmd) |
7481deb4 | 2537 | { |
afc16604 BVA |
2538 | struct se_session *se_sess = se_cmd->se_sess; |
2539 | ||
0ed6e189 | 2540 | if (!se_sess) { |
febe562c | 2541 | target_free_cmd_mem(se_cmd); |
0ed6e189 NB |
2542 | se_cmd->se_tfo->release_cmd(se_cmd); |
2543 | return 1; | |
2544 | } | |
9ff9d15e | 2545 | return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref); |
a17f091d NB |
2546 | } |
2547 | EXPORT_SYMBOL(target_put_sess_cmd); | |
2548 | ||
1c7b13fe RD |
2549 | /* target_sess_cmd_list_set_waiting - Flag all commands in |
2550 | * sess_cmd_list to complete cmd_wait_comp. Set | |
2551 | * sess_tearing_down so no more commands are queued. | |
2552 | * @se_sess: session to flag | |
a17f091d | 2553 | */ |
1c7b13fe | 2554 | void target_sess_cmd_list_set_waiting(struct se_session *se_sess) |
a17f091d NB |
2555 | { |
2556 | struct se_cmd *se_cmd; | |
2557 | unsigned long flags; | |
0f4a9431 | 2558 | int rc; |
a17f091d | 2559 | |
a17f091d | 2560 | spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); |
9b31a328 NB |
2561 | if (se_sess->sess_tearing_down) { |
2562 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); | |
2563 | return; | |
2564 | } | |
1c7b13fe | 2565 | se_sess->sess_tearing_down = 1; |
9b31a328 | 2566 | list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list); |
a17f091d | 2567 | |
0f4a9431 NB |
2568 | list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list) { |
2569 | rc = kref_get_unless_zero(&se_cmd->cmd_kref); | |
2570 | if (rc) { | |
2571 | se_cmd->cmd_wait_set = 1; | |
2572 | spin_lock(&se_cmd->t_state_lock); | |
2573 | se_cmd->transport_state |= CMD_T_FABRIC_STOP; | |
2574 | spin_unlock(&se_cmd->t_state_lock); | |
2575 | } | |
2576 | } | |
a17f091d NB |
2577 | |
2578 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); | |
2579 | } | |
1c7b13fe | 2580 | EXPORT_SYMBOL(target_sess_cmd_list_set_waiting); |
a17f091d NB |
2581 | |
2582 | /* target_wait_for_sess_cmds - Wait for outstanding descriptors | |
2583 | * @se_sess: session to wait for active I/O | |
a17f091d | 2584 | */ |
be646c2d | 2585 | void target_wait_for_sess_cmds(struct se_session *se_sess) |
a17f091d NB |
2586 | { |
2587 | struct se_cmd *se_cmd, *tmp_cmd; | |
9b31a328 | 2588 | unsigned long flags; |
0f4a9431 | 2589 | bool tas; |
a17f091d NB |
2590 | |
2591 | list_for_each_entry_safe(se_cmd, tmp_cmd, | |
9b31a328 | 2592 | &se_sess->sess_wait_list, se_cmd_list) { |
0f4a9431 | 2593 | list_del_init(&se_cmd->se_cmd_list); |
a17f091d NB |
2594 | |
2595 | pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:" | |
2596 | " %d\n", se_cmd, se_cmd->t_state, | |
2597 | se_cmd->se_tfo->get_cmd_state(se_cmd)); | |
2598 | ||
0f4a9431 NB |
2599 | spin_lock_irqsave(&se_cmd->t_state_lock, flags); |
2600 | tas = (se_cmd->transport_state & CMD_T_TAS); | |
2601 | spin_unlock_irqrestore(&se_cmd->t_state_lock, flags); | |
2602 | ||
2603 | if (!target_put_sess_cmd(se_cmd)) { | |
2604 | if (tas) | |
2605 | target_put_sess_cmd(se_cmd); | |
2606 | } | |
2607 | ||
be646c2d JE |
2608 | wait_for_completion(&se_cmd->cmd_wait_comp); |
2609 | pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d" | |
2610 | " fabric state: %d\n", se_cmd, se_cmd->t_state, | |
2611 | se_cmd->se_tfo->get_cmd_state(se_cmd)); | |
a17f091d NB |
2612 | |
2613 | se_cmd->se_tfo->release_cmd(se_cmd); | |
2614 | } | |
9b31a328 NB |
2615 | |
2616 | spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); | |
2617 | WARN_ON(!list_empty(&se_sess->sess_cmd_list)); | |
2618 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); | |
2619 | ||
a17f091d NB |
2620 | } |
2621 | EXPORT_SYMBOL(target_wait_for_sess_cmds); | |
2622 | ||
b3eeea66 | 2623 | void transport_clear_lun_ref(struct se_lun *lun) |
c66ac9db | 2624 | { |
5277797d | 2625 | percpu_ref_kill(&lun->lun_ref); |
5277797d | 2626 | wait_for_completion(&lun->lun_ref_comp); |
c66ac9db NB |
2627 | } |
2628 | ||
0f4a9431 NB |
2629 | static bool |
2630 | __transport_wait_for_tasks(struct se_cmd *cmd, bool fabric_stop, | |
2631 | bool *aborted, bool *tas, unsigned long *flags) | |
2632 | __releases(&cmd->t_state_lock) | |
2633 | __acquires(&cmd->t_state_lock) | |
c66ac9db | 2634 | { |
c66ac9db | 2635 | |
0f4a9431 NB |
2636 | assert_spin_locked(&cmd->t_state_lock); |
2637 | WARN_ON_ONCE(!irqs_disabled()); | |
2638 | ||
2639 | if (fabric_stop) | |
2640 | cmd->transport_state |= CMD_T_FABRIC_STOP; | |
2641 | ||
2642 | if (cmd->transport_state & CMD_T_ABORTED) | |
2643 | *aborted = true; | |
2644 | ||
2645 | if (cmd->transport_state & CMD_T_TAS) | |
2646 | *tas = true; | |
2647 | ||
c8e31f26 | 2648 | if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && |
0f4a9431 | 2649 | !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) |
a17f091d | 2650 | return false; |
cb4f4d3c | 2651 | |
c8e31f26 | 2652 | if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) && |
0f4a9431 | 2653 | !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) |
a17f091d | 2654 | return false; |
7d680f3b | 2655 | |
0f4a9431 NB |
2656 | if (!(cmd->transport_state & CMD_T_ACTIVE)) |
2657 | return false; | |
2658 | ||
2659 | if (fabric_stop && *aborted) | |
a17f091d | 2660 | return false; |
c66ac9db | 2661 | |
7d680f3b | 2662 | cmd->transport_state |= CMD_T_STOP; |
c66ac9db | 2663 | |
0f4a9431 NB |
2664 | pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08llx i_state: %d," |
2665 | " t_state: %d, CMD_T_STOP\n", cmd, cmd->tag, | |
2666 | cmd->se_tfo->get_cmd_state(cmd), cmd->t_state); | |
c66ac9db | 2667 | |
0f4a9431 | 2668 | spin_unlock_irqrestore(&cmd->t_state_lock, *flags); |
c66ac9db | 2669 | |
a1d8b49a | 2670 | wait_for_completion(&cmd->t_transport_stop_comp); |
c66ac9db | 2671 | |
0f4a9431 | 2672 | spin_lock_irqsave(&cmd->t_state_lock, *flags); |
7d680f3b | 2673 | cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP); |
c66ac9db | 2674 | |
0f4a9431 NB |
2675 | pr_debug("wait_for_tasks: Stopped wait_for_completion(&cmd->" |
2676 | "t_transport_stop_comp) for ITT: 0x%08llx\n", cmd->tag); | |
c66ac9db | 2677 | |
0f4a9431 NB |
2678 | return true; |
2679 | } | |
2680 | ||
2681 | /** | |
2682 | * transport_wait_for_tasks - wait for completion to occur | |
2683 | * @cmd: command to wait | |
2684 | * | |
2685 | * Called from frontend fabric context to wait for storage engine | |
2686 | * to pause and/or release frontend generated struct se_cmd. | |
2687 | */ | |
2688 | bool transport_wait_for_tasks(struct se_cmd *cmd) | |
2689 | { | |
2690 | unsigned long flags; | |
2691 | bool ret, aborted = false, tas = false; | |
2692 | ||
2693 | spin_lock_irqsave(&cmd->t_state_lock, flags); | |
2694 | ret = __transport_wait_for_tasks(cmd, false, &aborted, &tas, &flags); | |
d14921d6 | 2695 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
a17f091d | 2696 | |
0f4a9431 | 2697 | return ret; |
c66ac9db | 2698 | } |
d14921d6 | 2699 | EXPORT_SYMBOL(transport_wait_for_tasks); |
c66ac9db | 2700 | |
ab78fef4 BVA |
2701 | struct sense_info { |
2702 | u8 key; | |
2703 | u8 asc; | |
2704 | u8 ascq; | |
2705 | bool add_sector_info; | |
2706 | }; | |
2707 | ||
2708 | static const struct sense_info sense_info_table[] = { | |
2709 | [TCM_NO_SENSE] = { | |
2710 | .key = NOT_READY | |
2711 | }, | |
2712 | [TCM_NON_EXISTENT_LUN] = { | |
2713 | .key = ILLEGAL_REQUEST, | |
2714 | .asc = 0x25 /* LOGICAL UNIT NOT SUPPORTED */ | |
2715 | }, | |
2716 | [TCM_UNSUPPORTED_SCSI_OPCODE] = { | |
2717 | .key = ILLEGAL_REQUEST, | |
2718 | .asc = 0x20, /* INVALID COMMAND OPERATION CODE */ | |
2719 | }, | |
2720 | [TCM_SECTOR_COUNT_TOO_MANY] = { | |
2721 | .key = ILLEGAL_REQUEST, | |
2722 | .asc = 0x20, /* INVALID COMMAND OPERATION CODE */ | |
2723 | }, | |
2724 | [TCM_UNKNOWN_MODE_PAGE] = { | |
2725 | .key = ILLEGAL_REQUEST, | |
2726 | .asc = 0x24, /* INVALID FIELD IN CDB */ | |
2727 | }, | |
2728 | [TCM_CHECK_CONDITION_ABORT_CMD] = { | |
2729 | .key = ABORTED_COMMAND, | |
2730 | .asc = 0x29, /* BUS DEVICE RESET FUNCTION OCCURRED */ | |
2731 | .ascq = 0x03, | |
2732 | }, | |
2733 | [TCM_INCORRECT_AMOUNT_OF_DATA] = { | |
2734 | .key = ABORTED_COMMAND, | |
2735 | .asc = 0x0c, /* WRITE ERROR */ | |
2736 | .ascq = 0x0d, /* NOT ENOUGH UNSOLICITED DATA */ | |
2737 | }, | |
2738 | [TCM_INVALID_CDB_FIELD] = { | |
2739 | .key = ILLEGAL_REQUEST, | |
2740 | .asc = 0x24, /* INVALID FIELD IN CDB */ | |
2741 | }, | |
2742 | [TCM_INVALID_PARAMETER_LIST] = { | |
2743 | .key = ILLEGAL_REQUEST, | |
2744 | .asc = 0x26, /* INVALID FIELD IN PARAMETER LIST */ | |
2745 | }, | |
2746 | [TCM_PARAMETER_LIST_LENGTH_ERROR] = { | |
2747 | .key = ILLEGAL_REQUEST, | |
2748 | .asc = 0x1a, /* PARAMETER LIST LENGTH ERROR */ | |
2749 | }, | |
2750 | [TCM_UNEXPECTED_UNSOLICITED_DATA] = { | |
2751 | .key = ILLEGAL_REQUEST, | |
2752 | .asc = 0x0c, /* WRITE ERROR */ | |
2753 | .ascq = 0x0c, /* UNEXPECTED_UNSOLICITED_DATA */ | |
2754 | }, | |
2755 | [TCM_SERVICE_CRC_ERROR] = { | |
2756 | .key = ABORTED_COMMAND, | |
2757 | .asc = 0x47, /* PROTOCOL SERVICE CRC ERROR */ | |
2758 | .ascq = 0x05, /* N/A */ | |
2759 | }, | |
2760 | [TCM_SNACK_REJECTED] = { | |
2761 | .key = ABORTED_COMMAND, | |
2762 | .asc = 0x11, /* READ ERROR */ | |
2763 | .ascq = 0x13, /* FAILED RETRANSMISSION REQUEST */ | |
2764 | }, | |
2765 | [TCM_WRITE_PROTECTED] = { | |
2766 | .key = DATA_PROTECT, | |
2767 | .asc = 0x27, /* WRITE PROTECTED */ | |
2768 | }, | |
2769 | [TCM_ADDRESS_OUT_OF_RANGE] = { | |
2770 | .key = ILLEGAL_REQUEST, | |
2771 | .asc = 0x21, /* LOGICAL BLOCK ADDRESS OUT OF RANGE */ | |
2772 | }, | |
2773 | [TCM_CHECK_CONDITION_UNIT_ATTENTION] = { | |
2774 | .key = UNIT_ATTENTION, | |
2775 | }, | |
2776 | [TCM_CHECK_CONDITION_NOT_READY] = { | |
2777 | .key = NOT_READY, | |
2778 | }, | |
2779 | [TCM_MISCOMPARE_VERIFY] = { | |
2780 | .key = MISCOMPARE, | |
2781 | .asc = 0x1d, /* MISCOMPARE DURING VERIFY OPERATION */ | |
2782 | .ascq = 0x00, | |
2783 | }, | |
2784 | [TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED] = { | |
734ca5c4 | 2785 | .key = ABORTED_COMMAND, |
ab78fef4 BVA |
2786 | .asc = 0x10, |
2787 | .ascq = 0x01, /* LOGICAL BLOCK GUARD CHECK FAILED */ | |
2788 | .add_sector_info = true, | |
2789 | }, | |
2790 | [TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED] = { | |
734ca5c4 | 2791 | .key = ABORTED_COMMAND, |
ab78fef4 BVA |
2792 | .asc = 0x10, |
2793 | .ascq = 0x02, /* LOGICAL BLOCK APPLICATION TAG CHECK FAILED */ | |
2794 | .add_sector_info = true, | |
2795 | }, | |
2796 | [TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED] = { | |
734ca5c4 | 2797 | .key = ABORTED_COMMAND, |
ab78fef4 BVA |
2798 | .asc = 0x10, |
2799 | .ascq = 0x03, /* LOGICAL BLOCK REFERENCE TAG CHECK FAILED */ | |
2800 | .add_sector_info = true, | |
2801 | }, | |
2802 | [TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE] = { | |
2803 | /* | |
2804 | * Returning ILLEGAL REQUEST would cause immediate IO errors on | |
2805 | * Solaris initiators. Returning NOT READY instead means the | |
2806 | * operations will be retried a finite number of times and we | |
2807 | * can survive intermittent errors. | |
2808 | */ | |
2809 | .key = NOT_READY, | |
2810 | .asc = 0x08, /* LOGICAL UNIT COMMUNICATION FAILURE */ | |
2811 | }, | |
2812 | }; | |
2813 | ||
f5a8b3a7 | 2814 | static int translate_sense_reason(struct se_cmd *cmd, sense_reason_t reason) |
ab78fef4 BVA |
2815 | { |
2816 | const struct sense_info *si; | |
2817 | u8 *buffer = cmd->sense_buffer; | |
2818 | int r = (__force int)reason; | |
2819 | u8 asc, ascq; | |
4e4937e8 | 2820 | bool desc_format = target_sense_desc_format(cmd->se_dev); |
ab78fef4 BVA |
2821 | |
2822 | if (r < ARRAY_SIZE(sense_info_table) && sense_info_table[r].key) | |
2823 | si = &sense_info_table[r]; | |
2824 | else | |
2825 | si = &sense_info_table[(__force int) | |
2826 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE]; | |
2827 | ||
ab78fef4 BVA |
2828 | if (reason == TCM_CHECK_CONDITION_UNIT_ATTENTION) { |
2829 | core_scsi3_ua_for_check_condition(cmd, &asc, &ascq); | |
2830 | WARN_ON_ONCE(asc == 0); | |
2831 | } else if (si->asc == 0) { | |
2832 | WARN_ON_ONCE(cmd->scsi_asc == 0); | |
2833 | asc = cmd->scsi_asc; | |
2834 | ascq = cmd->scsi_ascq; | |
2835 | } else { | |
2836 | asc = si->asc; | |
2837 | ascq = si->ascq; | |
2838 | } | |
9ec1e1ce | 2839 | |
4e4937e8 | 2840 | scsi_build_sense_buffer(desc_format, buffer, si->key, asc, ascq); |
ab78fef4 | 2841 | if (si->add_sector_info) |
f5a8b3a7 SG |
2842 | return scsi_set_sense_information(buffer, |
2843 | cmd->scsi_sense_length, | |
2844 | cmd->bad_sector); | |
2845 | ||
2846 | return 0; | |
ab78fef4 BVA |
2847 | } |
2848 | ||
de103c93 CH |
2849 | int |
2850 | transport_send_check_condition_and_sense(struct se_cmd *cmd, | |
2851 | sense_reason_t reason, int from_transport) | |
c66ac9db | 2852 | { |
c66ac9db | 2853 | unsigned long flags; |
c66ac9db | 2854 | |
a1d8b49a | 2855 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 2856 | if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) { |
a1d8b49a | 2857 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
2858 | return 0; |
2859 | } | |
2860 | cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION; | |
a1d8b49a | 2861 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 2862 | |
ab78fef4 | 2863 | if (!from_transport) { |
f5a8b3a7 SG |
2864 | int rc; |
2865 | ||
c66ac9db | 2866 | cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE; |
ab78fef4 BVA |
2867 | cmd->scsi_status = SAM_STAT_CHECK_CONDITION; |
2868 | cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER; | |
f5a8b3a7 SG |
2869 | rc = translate_sense_reason(cmd, reason); |
2870 | if (rc) | |
2871 | return rc; | |
c66ac9db | 2872 | } |
c66ac9db | 2873 | |
e5c0d6ad | 2874 | trace_target_cmd_complete(cmd); |
07bde79a | 2875 | return cmd->se_tfo->queue_status(cmd); |
c66ac9db NB |
2876 | } |
2877 | EXPORT_SYMBOL(transport_send_check_condition_and_sense); | |
2878 | ||
310d3d31 NB |
2879 | static int __transport_check_aborted_status(struct se_cmd *cmd, int send_status) |
2880 | __releases(&cmd->t_state_lock) | |
2881 | __acquires(&cmd->t_state_lock) | |
c66ac9db | 2882 | { |
310d3d31 NB |
2883 | assert_spin_locked(&cmd->t_state_lock); |
2884 | WARN_ON_ONCE(!irqs_disabled()); | |
2885 | ||
c18bc7d8 RD |
2886 | if (!(cmd->transport_state & CMD_T_ABORTED)) |
2887 | return 0; | |
68259b5a AL |
2888 | /* |
2889 | * If cmd has been aborted but either no status is to be sent or it has | |
2890 | * already been sent, just return | |
2891 | */ | |
310d3d31 NB |
2892 | if (!send_status || !(cmd->se_cmd_flags & SCF_SEND_DELAYED_TAS)) { |
2893 | if (send_status) | |
2894 | cmd->se_cmd_flags |= SCF_SEND_DELAYED_TAS; | |
c18bc7d8 | 2895 | return 1; |
310d3d31 | 2896 | } |
8b1e1244 | 2897 | |
310d3d31 NB |
2898 | pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB:" |
2899 | " 0x%02x ITT: 0x%08llx\n", cmd->t_task_cdb[0], cmd->tag); | |
8b1e1244 | 2900 | |
68259b5a | 2901 | cmd->se_cmd_flags &= ~SCF_SEND_DELAYED_TAS; |
29f4c090 | 2902 | cmd->scsi_status = SAM_STAT_TASK_ABORTED; |
e5c0d6ad | 2903 | trace_target_cmd_complete(cmd); |
310d3d31 NB |
2904 | |
2905 | spin_unlock_irq(&cmd->t_state_lock); | |
c18bc7d8 | 2906 | cmd->se_tfo->queue_status(cmd); |
310d3d31 | 2907 | spin_lock_irq(&cmd->t_state_lock); |
c18bc7d8 RD |
2908 | |
2909 | return 1; | |
c66ac9db | 2910 | } |
310d3d31 NB |
2911 | |
2912 | int transport_check_aborted_status(struct se_cmd *cmd, int send_status) | |
2913 | { | |
2914 | int ret; | |
2915 | ||
2916 | spin_lock_irq(&cmd->t_state_lock); | |
2917 | ret = __transport_check_aborted_status(cmd, send_status); | |
2918 | spin_unlock_irq(&cmd->t_state_lock); | |
2919 | ||
2920 | return ret; | |
2921 | } | |
c66ac9db NB |
2922 | EXPORT_SYMBOL(transport_check_aborted_status); |
2923 | ||
2924 | void transport_send_task_abort(struct se_cmd *cmd) | |
2925 | { | |
c252f003 NB |
2926 | unsigned long flags; |
2927 | ||
2928 | spin_lock_irqsave(&cmd->t_state_lock, flags); | |
68259b5a | 2929 | if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION)) { |
c252f003 NB |
2930 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
2931 | return; | |
2932 | } | |
2933 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
2934 | ||
c66ac9db NB |
2935 | /* |
2936 | * If there are still expected incoming fabric WRITEs, we wait | |
2937 | * until until they have completed before sending a TASK_ABORTED | |
2938 | * response. This response with TASK_ABORTED status will be | |
2939 | * queued back to fabric module by transport_check_aborted_status(). | |
2940 | */ | |
2941 | if (cmd->data_direction == DMA_TO_DEVICE) { | |
e3d6f909 | 2942 | if (cmd->se_tfo->write_pending_status(cmd) != 0) { |
310d3d31 NB |
2943 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
2944 | if (cmd->se_cmd_flags & SCF_SEND_DELAYED_TAS) { | |
2945 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
2946 | goto send_abort; | |
2947 | } | |
68259b5a | 2948 | cmd->se_cmd_flags |= SCF_SEND_DELAYED_TAS; |
310d3d31 | 2949 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
29f4c090 | 2950 | return; |
c66ac9db NB |
2951 | } |
2952 | } | |
310d3d31 | 2953 | send_abort: |
c66ac9db | 2954 | cmd->scsi_status = SAM_STAT_TASK_ABORTED; |
8b1e1244 | 2955 | |
72b59d6e RD |
2956 | transport_lun_remove_cmd(cmd); |
2957 | ||
649ee054 BVA |
2958 | pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x, ITT: 0x%08llx\n", |
2959 | cmd->t_task_cdb[0], cmd->tag); | |
8b1e1244 | 2960 | |
e5c0d6ad | 2961 | trace_target_cmd_complete(cmd); |
e3d6f909 | 2962 | cmd->se_tfo->queue_status(cmd); |
c66ac9db NB |
2963 | } |
2964 | ||
af877292 | 2965 | static void target_tmr_work(struct work_struct *work) |
c66ac9db | 2966 | { |
af877292 | 2967 | struct se_cmd *cmd = container_of(work, struct se_cmd, work); |
5951146d | 2968 | struct se_device *dev = cmd->se_dev; |
c66ac9db | 2969 | struct se_tmr_req *tmr = cmd->se_tmr_req; |
a6d9bb1c | 2970 | unsigned long flags; |
c66ac9db NB |
2971 | int ret; |
2972 | ||
a6d9bb1c NB |
2973 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
2974 | if (cmd->transport_state & CMD_T_ABORTED) { | |
2975 | tmr->response = TMR_FUNCTION_REJECTED; | |
2976 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
2977 | goto check_stop; | |
2978 | } | |
2979 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
2980 | ||
c66ac9db | 2981 | switch (tmr->function) { |
5c6cd613 | 2982 | case TMR_ABORT_TASK: |
3d28934a | 2983 | core_tmr_abort_task(dev, tmr, cmd->se_sess); |
c66ac9db | 2984 | break; |
5c6cd613 NB |
2985 | case TMR_ABORT_TASK_SET: |
2986 | case TMR_CLEAR_ACA: | |
2987 | case TMR_CLEAR_TASK_SET: | |
c66ac9db NB |
2988 | tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED; |
2989 | break; | |
5c6cd613 | 2990 | case TMR_LUN_RESET: |
c66ac9db NB |
2991 | ret = core_tmr_lun_reset(dev, tmr, NULL, NULL); |
2992 | tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE : | |
2993 | TMR_FUNCTION_REJECTED; | |
b5aafb16 HR |
2994 | if (tmr->response == TMR_FUNCTION_COMPLETE) { |
2995 | target_ua_allocate_lun(cmd->se_sess->se_node_acl, | |
2996 | cmd->orig_fe_lun, 0x29, | |
2997 | ASCQ_29H_BUS_DEVICE_RESET_FUNCTION_OCCURRED); | |
2998 | } | |
c66ac9db | 2999 | break; |
5c6cd613 | 3000 | case TMR_TARGET_WARM_RESET: |
c66ac9db NB |
3001 | tmr->response = TMR_FUNCTION_REJECTED; |
3002 | break; | |
5c6cd613 | 3003 | case TMR_TARGET_COLD_RESET: |
c66ac9db NB |
3004 | tmr->response = TMR_FUNCTION_REJECTED; |
3005 | break; | |
c66ac9db | 3006 | default: |
6708bb27 | 3007 | pr_err("Uknown TMR function: 0x%02x.\n", |
c66ac9db NB |
3008 | tmr->function); |
3009 | tmr->response = TMR_FUNCTION_REJECTED; | |
3010 | break; | |
3011 | } | |
3012 | ||
a6d9bb1c NB |
3013 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
3014 | if (cmd->transport_state & CMD_T_ABORTED) { | |
3015 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
3016 | goto check_stop; | |
3017 | } | |
c66ac9db | 3018 | cmd->t_state = TRANSPORT_ISTATE_PROCESSING; |
a6d9bb1c NB |
3019 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
3020 | ||
e3d6f909 | 3021 | cmd->se_tfo->queue_tm_rsp(cmd); |
c66ac9db | 3022 | |
a6d9bb1c | 3023 | check_stop: |
b7b8bef7 | 3024 | transport_cmd_check_stop_to_fabric(cmd); |
c66ac9db NB |
3025 | } |
3026 | ||
af877292 CH |
3027 | int transport_generic_handle_tmr( |
3028 | struct se_cmd *cmd) | |
c66ac9db | 3029 | { |
f15e9cd9 NB |
3030 | unsigned long flags; |
3031 | ||
3032 | spin_lock_irqsave(&cmd->t_state_lock, flags); | |
3033 | cmd->transport_state |= CMD_T_ACTIVE; | |
3034 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
3035 | ||
af877292 CH |
3036 | INIT_WORK(&cmd->work, target_tmr_work); |
3037 | queue_work(cmd->se_dev->tmr_wq, &cmd->work); | |
c66ac9db NB |
3038 | return 0; |
3039 | } | |
af877292 | 3040 | EXPORT_SYMBOL(transport_generic_handle_tmr); |
814e5b45 CH |
3041 | |
3042 | bool | |
3043 | target_check_wce(struct se_device *dev) | |
3044 | { | |
3045 | bool wce = false; | |
3046 | ||
3047 | if (dev->transport->get_write_cache) | |
3048 | wce = dev->transport->get_write_cache(dev); | |
3049 | else if (dev->dev_attrib.emulate_write_cache > 0) | |
3050 | wce = true; | |
3051 | ||
3052 | return wce; | |
3053 | } | |
3054 | ||
3055 | bool | |
3056 | target_check_fua(struct se_device *dev) | |
3057 | { | |
3058 | return target_check_wce(dev) && dev->dev_attrib.emulate_fua_write > 0; | |
3059 | } |