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c66ac9db NB |
1 | /******************************************************************************* |
2 | * Filename: target_core_transport.c | |
3 | * | |
4 | * This file contains the Generic Target Engine Core. | |
5 | * | |
6 | * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc. | |
7 | * Copyright (c) 2005, 2006, 2007 SBE, Inc. | |
8 | * Copyright (c) 2007-2010 Rising Tide Systems | |
9 | * Copyright (c) 2008-2010 Linux-iSCSI.org | |
10 | * | |
11 | * Nicholas A. Bellinger <nab@kernel.org> | |
12 | * | |
13 | * This program is free software; you can redistribute it and/or modify | |
14 | * it under the terms of the GNU General Public License as published by | |
15 | * the Free Software Foundation; either version 2 of the License, or | |
16 | * (at your option) any later version. | |
17 | * | |
18 | * This program is distributed in the hope that it will be useful, | |
19 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
21 | * GNU General Public License for more details. | |
22 | * | |
23 | * You should have received a copy of the GNU General Public License | |
24 | * along with this program; if not, write to the Free Software | |
25 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
26 | * | |
27 | ******************************************************************************/ | |
28 | ||
c66ac9db NB |
29 | #include <linux/net.h> |
30 | #include <linux/delay.h> | |
31 | #include <linux/string.h> | |
32 | #include <linux/timer.h> | |
33 | #include <linux/slab.h> | |
34 | #include <linux/blkdev.h> | |
35 | #include <linux/spinlock.h> | |
c66ac9db NB |
36 | #include <linux/kthread.h> |
37 | #include <linux/in.h> | |
38 | #include <linux/cdrom.h> | |
827509e3 | 39 | #include <linux/module.h> |
c66ac9db NB |
40 | #include <asm/unaligned.h> |
41 | #include <net/sock.h> | |
42 | #include <net/tcp.h> | |
43 | #include <scsi/scsi.h> | |
44 | #include <scsi/scsi_cmnd.h> | |
e66ecd50 | 45 | #include <scsi/scsi_tcq.h> |
c66ac9db NB |
46 | |
47 | #include <target/target_core_base.h> | |
c4795fb2 CH |
48 | #include <target/target_core_backend.h> |
49 | #include <target/target_core_fabric.h> | |
c66ac9db NB |
50 | #include <target/target_core_configfs.h> |
51 | ||
e26d99ae | 52 | #include "target_core_internal.h" |
c66ac9db | 53 | #include "target_core_alua.h" |
c66ac9db | 54 | #include "target_core_pr.h" |
c66ac9db NB |
55 | #include "target_core_ua.h" |
56 | ||
e3d6f909 | 57 | static int sub_api_initialized; |
c66ac9db | 58 | |
35e0e757 | 59 | static struct workqueue_struct *target_completion_wq; |
c66ac9db NB |
60 | static struct kmem_cache *se_sess_cache; |
61 | struct kmem_cache *se_tmr_req_cache; | |
62 | struct kmem_cache *se_ua_cache; | |
c66ac9db NB |
63 | struct kmem_cache *t10_pr_reg_cache; |
64 | struct kmem_cache *t10_alua_lu_gp_cache; | |
65 | struct kmem_cache *t10_alua_lu_gp_mem_cache; | |
66 | struct kmem_cache *t10_alua_tg_pt_gp_cache; | |
67 | struct kmem_cache *t10_alua_tg_pt_gp_mem_cache; | |
68 | ||
c66ac9db | 69 | static int transport_generic_write_pending(struct se_cmd *); |
5951146d | 70 | static int transport_processing_thread(void *param); |
4d2300cc | 71 | static int __transport_execute_tasks(struct se_device *dev, struct se_cmd *); |
c66ac9db | 72 | static void transport_complete_task_attr(struct se_cmd *cmd); |
07bde79a | 73 | static void transport_handle_queue_full(struct se_cmd *cmd, |
e057f533 | 74 | struct se_device *dev); |
c66ac9db | 75 | static void transport_free_dev_tasks(struct se_cmd *cmd); |
05d1c7c0 | 76 | static int transport_generic_get_mem(struct se_cmd *cmd); |
39c05f32 | 77 | static void transport_put_cmd(struct se_cmd *cmd); |
3df8d40b | 78 | static void transport_remove_cmd_from_queue(struct se_cmd *cmd); |
c66ac9db | 79 | static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq); |
03e98c9e | 80 | static void transport_generic_request_failure(struct se_cmd *); |
35e0e757 | 81 | static void target_complete_ok_work(struct work_struct *work); |
c66ac9db | 82 | |
e3d6f909 | 83 | int init_se_kmem_caches(void) |
c66ac9db | 84 | { |
c66ac9db NB |
85 | se_tmr_req_cache = kmem_cache_create("se_tmr_cache", |
86 | sizeof(struct se_tmr_req), __alignof__(struct se_tmr_req), | |
87 | 0, NULL); | |
6708bb27 AG |
88 | if (!se_tmr_req_cache) { |
89 | pr_err("kmem_cache_create() for struct se_tmr_req" | |
c66ac9db | 90 | " failed\n"); |
97c34f3b | 91 | goto out; |
c66ac9db NB |
92 | } |
93 | se_sess_cache = kmem_cache_create("se_sess_cache", | |
94 | sizeof(struct se_session), __alignof__(struct se_session), | |
95 | 0, NULL); | |
6708bb27 AG |
96 | if (!se_sess_cache) { |
97 | pr_err("kmem_cache_create() for struct se_session" | |
c66ac9db | 98 | " failed\n"); |
35e0e757 | 99 | goto out_free_tmr_req_cache; |
c66ac9db NB |
100 | } |
101 | se_ua_cache = kmem_cache_create("se_ua_cache", | |
102 | sizeof(struct se_ua), __alignof__(struct se_ua), | |
103 | 0, NULL); | |
6708bb27 AG |
104 | if (!se_ua_cache) { |
105 | pr_err("kmem_cache_create() for struct se_ua failed\n"); | |
35e0e757 | 106 | goto out_free_sess_cache; |
c66ac9db | 107 | } |
c66ac9db NB |
108 | t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache", |
109 | sizeof(struct t10_pr_registration), | |
110 | __alignof__(struct t10_pr_registration), 0, NULL); | |
6708bb27 AG |
111 | if (!t10_pr_reg_cache) { |
112 | pr_err("kmem_cache_create() for struct t10_pr_registration" | |
c66ac9db | 113 | " failed\n"); |
35e0e757 | 114 | goto out_free_ua_cache; |
c66ac9db NB |
115 | } |
116 | t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache", | |
117 | sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp), | |
118 | 0, NULL); | |
6708bb27 AG |
119 | if (!t10_alua_lu_gp_cache) { |
120 | pr_err("kmem_cache_create() for t10_alua_lu_gp_cache" | |
c66ac9db | 121 | " failed\n"); |
35e0e757 | 122 | goto out_free_pr_reg_cache; |
c66ac9db NB |
123 | } |
124 | t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache", | |
125 | sizeof(struct t10_alua_lu_gp_member), | |
126 | __alignof__(struct t10_alua_lu_gp_member), 0, NULL); | |
6708bb27 AG |
127 | if (!t10_alua_lu_gp_mem_cache) { |
128 | pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_" | |
c66ac9db | 129 | "cache failed\n"); |
35e0e757 | 130 | goto out_free_lu_gp_cache; |
c66ac9db NB |
131 | } |
132 | t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache", | |
133 | sizeof(struct t10_alua_tg_pt_gp), | |
134 | __alignof__(struct t10_alua_tg_pt_gp), 0, NULL); | |
6708bb27 AG |
135 | if (!t10_alua_tg_pt_gp_cache) { |
136 | pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_" | |
c66ac9db | 137 | "cache failed\n"); |
35e0e757 | 138 | goto out_free_lu_gp_mem_cache; |
c66ac9db NB |
139 | } |
140 | t10_alua_tg_pt_gp_mem_cache = kmem_cache_create( | |
141 | "t10_alua_tg_pt_gp_mem_cache", | |
142 | sizeof(struct t10_alua_tg_pt_gp_member), | |
143 | __alignof__(struct t10_alua_tg_pt_gp_member), | |
144 | 0, NULL); | |
6708bb27 AG |
145 | if (!t10_alua_tg_pt_gp_mem_cache) { |
146 | pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_" | |
c66ac9db | 147 | "mem_t failed\n"); |
35e0e757 | 148 | goto out_free_tg_pt_gp_cache; |
c66ac9db NB |
149 | } |
150 | ||
35e0e757 CH |
151 | target_completion_wq = alloc_workqueue("target_completion", |
152 | WQ_MEM_RECLAIM, 0); | |
153 | if (!target_completion_wq) | |
154 | goto out_free_tg_pt_gp_mem_cache; | |
155 | ||
c66ac9db | 156 | return 0; |
35e0e757 CH |
157 | |
158 | out_free_tg_pt_gp_mem_cache: | |
159 | kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache); | |
160 | out_free_tg_pt_gp_cache: | |
161 | kmem_cache_destroy(t10_alua_tg_pt_gp_cache); | |
162 | out_free_lu_gp_mem_cache: | |
163 | kmem_cache_destroy(t10_alua_lu_gp_mem_cache); | |
164 | out_free_lu_gp_cache: | |
165 | kmem_cache_destroy(t10_alua_lu_gp_cache); | |
166 | out_free_pr_reg_cache: | |
167 | kmem_cache_destroy(t10_pr_reg_cache); | |
168 | out_free_ua_cache: | |
169 | kmem_cache_destroy(se_ua_cache); | |
170 | out_free_sess_cache: | |
171 | kmem_cache_destroy(se_sess_cache); | |
172 | out_free_tmr_req_cache: | |
173 | kmem_cache_destroy(se_tmr_req_cache); | |
c66ac9db | 174 | out: |
e3d6f909 | 175 | return -ENOMEM; |
c66ac9db NB |
176 | } |
177 | ||
e3d6f909 | 178 | void release_se_kmem_caches(void) |
c66ac9db | 179 | { |
35e0e757 | 180 | destroy_workqueue(target_completion_wq); |
c66ac9db NB |
181 | kmem_cache_destroy(se_tmr_req_cache); |
182 | kmem_cache_destroy(se_sess_cache); | |
183 | kmem_cache_destroy(se_ua_cache); | |
c66ac9db NB |
184 | kmem_cache_destroy(t10_pr_reg_cache); |
185 | kmem_cache_destroy(t10_alua_lu_gp_cache); | |
186 | kmem_cache_destroy(t10_alua_lu_gp_mem_cache); | |
187 | kmem_cache_destroy(t10_alua_tg_pt_gp_cache); | |
188 | kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache); | |
c66ac9db NB |
189 | } |
190 | ||
e3d6f909 AG |
191 | /* This code ensures unique mib indexes are handed out. */ |
192 | static DEFINE_SPINLOCK(scsi_mib_index_lock); | |
193 | static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX]; | |
e89d15ee NB |
194 | |
195 | /* | |
196 | * Allocate a new row index for the entry type specified | |
197 | */ | |
198 | u32 scsi_get_new_index(scsi_index_t type) | |
199 | { | |
200 | u32 new_index; | |
201 | ||
e3d6f909 | 202 | BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX)); |
e89d15ee | 203 | |
e3d6f909 AG |
204 | spin_lock(&scsi_mib_index_lock); |
205 | new_index = ++scsi_mib_index[type]; | |
206 | spin_unlock(&scsi_mib_index_lock); | |
e89d15ee NB |
207 | |
208 | return new_index; | |
209 | } | |
210 | ||
e26d99ae | 211 | static void transport_init_queue_obj(struct se_queue_obj *qobj) |
c66ac9db NB |
212 | { |
213 | atomic_set(&qobj->queue_cnt, 0); | |
214 | INIT_LIST_HEAD(&qobj->qobj_list); | |
215 | init_waitqueue_head(&qobj->thread_wq); | |
216 | spin_lock_init(&qobj->cmd_queue_lock); | |
217 | } | |
c66ac9db | 218 | |
dbc5623e | 219 | void transport_subsystem_check_init(void) |
c66ac9db NB |
220 | { |
221 | int ret; | |
222 | ||
dbc5623e NB |
223 | if (sub_api_initialized) |
224 | return; | |
225 | ||
c66ac9db NB |
226 | ret = request_module("target_core_iblock"); |
227 | if (ret != 0) | |
6708bb27 | 228 | pr_err("Unable to load target_core_iblock\n"); |
c66ac9db NB |
229 | |
230 | ret = request_module("target_core_file"); | |
231 | if (ret != 0) | |
6708bb27 | 232 | pr_err("Unable to load target_core_file\n"); |
c66ac9db NB |
233 | |
234 | ret = request_module("target_core_pscsi"); | |
235 | if (ret != 0) | |
6708bb27 | 236 | pr_err("Unable to load target_core_pscsi\n"); |
c66ac9db NB |
237 | |
238 | ret = request_module("target_core_stgt"); | |
239 | if (ret != 0) | |
6708bb27 | 240 | pr_err("Unable to load target_core_stgt\n"); |
c66ac9db | 241 | |
e3d6f909 | 242 | sub_api_initialized = 1; |
dbc5623e | 243 | return; |
c66ac9db NB |
244 | } |
245 | ||
246 | struct se_session *transport_init_session(void) | |
247 | { | |
248 | struct se_session *se_sess; | |
249 | ||
250 | se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL); | |
6708bb27 AG |
251 | if (!se_sess) { |
252 | pr_err("Unable to allocate struct se_session from" | |
c66ac9db NB |
253 | " se_sess_cache\n"); |
254 | return ERR_PTR(-ENOMEM); | |
255 | } | |
256 | INIT_LIST_HEAD(&se_sess->sess_list); | |
257 | INIT_LIST_HEAD(&se_sess->sess_acl_list); | |
a17f091d NB |
258 | INIT_LIST_HEAD(&se_sess->sess_cmd_list); |
259 | INIT_LIST_HEAD(&se_sess->sess_wait_list); | |
260 | spin_lock_init(&se_sess->sess_cmd_lock); | |
c66ac9db NB |
261 | |
262 | return se_sess; | |
263 | } | |
264 | EXPORT_SYMBOL(transport_init_session); | |
265 | ||
266 | /* | |
267 | * Called with spin_lock_bh(&struct se_portal_group->session_lock called. | |
268 | */ | |
269 | void __transport_register_session( | |
270 | struct se_portal_group *se_tpg, | |
271 | struct se_node_acl *se_nacl, | |
272 | struct se_session *se_sess, | |
273 | void *fabric_sess_ptr) | |
274 | { | |
275 | unsigned char buf[PR_REG_ISID_LEN]; | |
276 | ||
277 | se_sess->se_tpg = se_tpg; | |
278 | se_sess->fabric_sess_ptr = fabric_sess_ptr; | |
279 | /* | |
280 | * Used by struct se_node_acl's under ConfigFS to locate active se_session-t | |
281 | * | |
282 | * Only set for struct se_session's that will actually be moving I/O. | |
283 | * eg: *NOT* discovery sessions. | |
284 | */ | |
285 | if (se_nacl) { | |
286 | /* | |
287 | * If the fabric module supports an ISID based TransportID, | |
288 | * save this value in binary from the fabric I_T Nexus now. | |
289 | */ | |
e3d6f909 | 290 | if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { |
c66ac9db | 291 | memset(&buf[0], 0, PR_REG_ISID_LEN); |
e3d6f909 | 292 | se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, |
c66ac9db NB |
293 | &buf[0], PR_REG_ISID_LEN); |
294 | se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]); | |
295 | } | |
296 | spin_lock_irq(&se_nacl->nacl_sess_lock); | |
297 | /* | |
298 | * The se_nacl->nacl_sess pointer will be set to the | |
299 | * last active I_T Nexus for each struct se_node_acl. | |
300 | */ | |
301 | se_nacl->nacl_sess = se_sess; | |
302 | ||
303 | list_add_tail(&se_sess->sess_acl_list, | |
304 | &se_nacl->acl_sess_list); | |
305 | spin_unlock_irq(&se_nacl->nacl_sess_lock); | |
306 | } | |
307 | list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list); | |
308 | ||
6708bb27 | 309 | pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n", |
e3d6f909 | 310 | se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr); |
c66ac9db NB |
311 | } |
312 | EXPORT_SYMBOL(__transport_register_session); | |
313 | ||
314 | void transport_register_session( | |
315 | struct se_portal_group *se_tpg, | |
316 | struct se_node_acl *se_nacl, | |
317 | struct se_session *se_sess, | |
318 | void *fabric_sess_ptr) | |
319 | { | |
320 | spin_lock_bh(&se_tpg->session_lock); | |
321 | __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr); | |
322 | spin_unlock_bh(&se_tpg->session_lock); | |
323 | } | |
324 | EXPORT_SYMBOL(transport_register_session); | |
325 | ||
326 | void transport_deregister_session_configfs(struct se_session *se_sess) | |
327 | { | |
328 | struct se_node_acl *se_nacl; | |
23388864 | 329 | unsigned long flags; |
c66ac9db NB |
330 | /* |
331 | * Used by struct se_node_acl's under ConfigFS to locate active struct se_session | |
332 | */ | |
333 | se_nacl = se_sess->se_node_acl; | |
6708bb27 | 334 | if (se_nacl) { |
23388864 | 335 | spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags); |
c66ac9db NB |
336 | list_del(&se_sess->sess_acl_list); |
337 | /* | |
338 | * If the session list is empty, then clear the pointer. | |
339 | * Otherwise, set the struct se_session pointer from the tail | |
340 | * element of the per struct se_node_acl active session list. | |
341 | */ | |
342 | if (list_empty(&se_nacl->acl_sess_list)) | |
343 | se_nacl->nacl_sess = NULL; | |
344 | else { | |
345 | se_nacl->nacl_sess = container_of( | |
346 | se_nacl->acl_sess_list.prev, | |
347 | struct se_session, sess_acl_list); | |
348 | } | |
23388864 | 349 | spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags); |
c66ac9db NB |
350 | } |
351 | } | |
352 | EXPORT_SYMBOL(transport_deregister_session_configfs); | |
353 | ||
354 | void transport_free_session(struct se_session *se_sess) | |
355 | { | |
356 | kmem_cache_free(se_sess_cache, se_sess); | |
357 | } | |
358 | EXPORT_SYMBOL(transport_free_session); | |
359 | ||
360 | void transport_deregister_session(struct se_session *se_sess) | |
361 | { | |
362 | struct se_portal_group *se_tpg = se_sess->se_tpg; | |
363 | struct se_node_acl *se_nacl; | |
e63a8e19 | 364 | unsigned long flags; |
c66ac9db | 365 | |
6708bb27 | 366 | if (!se_tpg) { |
c66ac9db NB |
367 | transport_free_session(se_sess); |
368 | return; | |
369 | } | |
c66ac9db | 370 | |
e63a8e19 | 371 | spin_lock_irqsave(&se_tpg->session_lock, flags); |
c66ac9db NB |
372 | list_del(&se_sess->sess_list); |
373 | se_sess->se_tpg = NULL; | |
374 | se_sess->fabric_sess_ptr = NULL; | |
e63a8e19 | 375 | spin_unlock_irqrestore(&se_tpg->session_lock, flags); |
c66ac9db NB |
376 | |
377 | /* | |
378 | * Determine if we need to do extra work for this initiator node's | |
379 | * struct se_node_acl if it had been previously dynamically generated. | |
380 | */ | |
381 | se_nacl = se_sess->se_node_acl; | |
6708bb27 | 382 | if (se_nacl) { |
e63a8e19 | 383 | spin_lock_irqsave(&se_tpg->acl_node_lock, flags); |
c66ac9db | 384 | if (se_nacl->dynamic_node_acl) { |
6708bb27 AG |
385 | if (!se_tpg->se_tpg_tfo->tpg_check_demo_mode_cache( |
386 | se_tpg)) { | |
c66ac9db NB |
387 | list_del(&se_nacl->acl_list); |
388 | se_tpg->num_node_acls--; | |
e63a8e19 | 389 | spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags); |
c66ac9db NB |
390 | |
391 | core_tpg_wait_for_nacl_pr_ref(se_nacl); | |
c66ac9db | 392 | core_free_device_list_for_node(se_nacl, se_tpg); |
e3d6f909 | 393 | se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg, |
c66ac9db | 394 | se_nacl); |
e63a8e19 | 395 | spin_lock_irqsave(&se_tpg->acl_node_lock, flags); |
c66ac9db NB |
396 | } |
397 | } | |
e63a8e19 | 398 | spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags); |
c66ac9db NB |
399 | } |
400 | ||
401 | transport_free_session(se_sess); | |
402 | ||
6708bb27 | 403 | pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n", |
e3d6f909 | 404 | se_tpg->se_tpg_tfo->get_fabric_name()); |
c66ac9db NB |
405 | } |
406 | EXPORT_SYMBOL(transport_deregister_session); | |
407 | ||
408 | /* | |
a1d8b49a | 409 | * Called with cmd->t_state_lock held. |
c66ac9db NB |
410 | */ |
411 | static void transport_all_task_dev_remove_state(struct se_cmd *cmd) | |
412 | { | |
42bf829e | 413 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
414 | struct se_task *task; |
415 | unsigned long flags; | |
416 | ||
42bf829e CH |
417 | if (!dev) |
418 | return; | |
c66ac9db | 419 | |
42bf829e | 420 | list_for_each_entry(task, &cmd->t_task_list, t_list) { |
6c76bf95 | 421 | if (task->task_flags & TF_ACTIVE) |
c66ac9db NB |
422 | continue; |
423 | ||
c66ac9db | 424 | spin_lock_irqsave(&dev->execute_task_lock, flags); |
1880807a CH |
425 | if (task->t_state_active) { |
426 | pr_debug("Removed ITT: 0x%08x dev: %p task[%p]\n", | |
427 | cmd->se_tfo->get_task_tag(cmd), dev, task); | |
c66ac9db | 428 | |
1880807a CH |
429 | list_del(&task->t_state_list); |
430 | atomic_dec(&cmd->t_task_cdbs_ex_left); | |
431 | task->t_state_active = false; | |
432 | } | |
433 | spin_unlock_irqrestore(&dev->execute_task_lock, flags); | |
c66ac9db | 434 | } |
1880807a | 435 | |
c66ac9db NB |
436 | } |
437 | ||
438 | /* transport_cmd_check_stop(): | |
439 | * | |
7d680f3b | 440 | * 'transport_off = 1' determines if CMD_T_ACTIVE should be cleared. |
c66ac9db NB |
441 | * 'transport_off = 2' determines if task_dev_state should be removed. |
442 | * | |
443 | * A non-zero u8 t_state sets cmd->t_state. | |
444 | * Returns 1 when command is stopped, else 0. | |
445 | */ | |
446 | static int transport_cmd_check_stop( | |
447 | struct se_cmd *cmd, | |
448 | int transport_off, | |
449 | u8 t_state) | |
450 | { | |
451 | unsigned long flags; | |
452 | ||
a1d8b49a | 453 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db NB |
454 | /* |
455 | * Determine if IOCTL context caller in requesting the stopping of this | |
456 | * command for LUN shutdown purposes. | |
457 | */ | |
7d680f3b CH |
458 | if (cmd->transport_state & CMD_T_LUN_STOP) { |
459 | pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n", | |
460 | __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd)); | |
c66ac9db | 461 | |
7d680f3b | 462 | cmd->transport_state &= ~CMD_T_ACTIVE; |
c66ac9db NB |
463 | if (transport_off == 2) |
464 | transport_all_task_dev_remove_state(cmd); | |
a1d8b49a | 465 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 466 | |
a1d8b49a | 467 | complete(&cmd->transport_lun_stop_comp); |
c66ac9db NB |
468 | return 1; |
469 | } | |
470 | /* | |
471 | * Determine if frontend context caller is requesting the stopping of | |
e3d6f909 | 472 | * this command for frontend exceptions. |
c66ac9db | 473 | */ |
7d680f3b CH |
474 | if (cmd->transport_state & CMD_T_STOP) { |
475 | pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n", | |
476 | __func__, __LINE__, | |
e3d6f909 | 477 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 478 | |
c66ac9db NB |
479 | if (transport_off == 2) |
480 | transport_all_task_dev_remove_state(cmd); | |
481 | ||
482 | /* | |
483 | * Clear struct se_cmd->se_lun before the transport_off == 2 handoff | |
484 | * to FE. | |
485 | */ | |
486 | if (transport_off == 2) | |
487 | cmd->se_lun = NULL; | |
a1d8b49a | 488 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 489 | |
a1d8b49a | 490 | complete(&cmd->t_transport_stop_comp); |
c66ac9db NB |
491 | return 1; |
492 | } | |
493 | if (transport_off) { | |
7d680f3b | 494 | cmd->transport_state &= ~CMD_T_ACTIVE; |
c66ac9db NB |
495 | if (transport_off == 2) { |
496 | transport_all_task_dev_remove_state(cmd); | |
497 | /* | |
498 | * Clear struct se_cmd->se_lun before the transport_off == 2 | |
499 | * handoff to fabric module. | |
500 | */ | |
501 | cmd->se_lun = NULL; | |
502 | /* | |
503 | * Some fabric modules like tcm_loop can release | |
25985edc | 504 | * their internally allocated I/O reference now and |
c66ac9db | 505 | * struct se_cmd now. |
88dd9e26 NB |
506 | * |
507 | * Fabric modules are expected to return '1' here if the | |
508 | * se_cmd being passed is released at this point, | |
509 | * or zero if not being released. | |
c66ac9db | 510 | */ |
e3d6f909 | 511 | if (cmd->se_tfo->check_stop_free != NULL) { |
c66ac9db | 512 | spin_unlock_irqrestore( |
a1d8b49a | 513 | &cmd->t_state_lock, flags); |
c66ac9db | 514 | |
88dd9e26 | 515 | return cmd->se_tfo->check_stop_free(cmd); |
c66ac9db NB |
516 | } |
517 | } | |
a1d8b49a | 518 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
519 | |
520 | return 0; | |
521 | } else if (t_state) | |
522 | cmd->t_state = t_state; | |
a1d8b49a | 523 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
524 | |
525 | return 0; | |
526 | } | |
527 | ||
528 | static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd) | |
529 | { | |
530 | return transport_cmd_check_stop(cmd, 2, 0); | |
531 | } | |
532 | ||
533 | static void transport_lun_remove_cmd(struct se_cmd *cmd) | |
534 | { | |
e3d6f909 | 535 | struct se_lun *lun = cmd->se_lun; |
c66ac9db NB |
536 | unsigned long flags; |
537 | ||
538 | if (!lun) | |
539 | return; | |
540 | ||
a1d8b49a | 541 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
7d680f3b CH |
542 | if (cmd->transport_state & CMD_T_DEV_ACTIVE) { |
543 | cmd->transport_state &= ~CMD_T_DEV_ACTIVE; | |
544 | transport_all_task_dev_remove_state(cmd); | |
c66ac9db | 545 | } |
a1d8b49a | 546 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 547 | |
c66ac9db | 548 | spin_lock_irqsave(&lun->lun_cmd_lock, flags); |
a1d8b49a | 549 | if (atomic_read(&cmd->transport_lun_active)) { |
5951146d | 550 | list_del(&cmd->se_lun_node); |
a1d8b49a | 551 | atomic_set(&cmd->transport_lun_active, 0); |
c66ac9db | 552 | #if 0 |
6708bb27 | 553 | pr_debug("Removed ITT: 0x%08x from LUN LIST[%d]\n" |
e3d6f909 | 554 | cmd->se_tfo->get_task_tag(cmd), lun->unpacked_lun); |
c66ac9db NB |
555 | #endif |
556 | } | |
557 | spin_unlock_irqrestore(&lun->lun_cmd_lock, flags); | |
558 | } | |
559 | ||
560 | void transport_cmd_finish_abort(struct se_cmd *cmd, int remove) | |
561 | { | |
8dc52b54 NB |
562 | if (!cmd->se_tmr_req) |
563 | transport_lun_remove_cmd(cmd); | |
c66ac9db NB |
564 | |
565 | if (transport_cmd_check_stop_to_fabric(cmd)) | |
566 | return; | |
77039d1e | 567 | if (remove) { |
3df8d40b | 568 | transport_remove_cmd_from_queue(cmd); |
e6a2573f | 569 | transport_put_cmd(cmd); |
77039d1e | 570 | } |
c66ac9db NB |
571 | } |
572 | ||
f7a5cc0b CH |
573 | static void transport_add_cmd_to_queue(struct se_cmd *cmd, int t_state, |
574 | bool at_head) | |
c66ac9db NB |
575 | { |
576 | struct se_device *dev = cmd->se_dev; | |
e3d6f909 | 577 | struct se_queue_obj *qobj = &dev->dev_queue_obj; |
c66ac9db NB |
578 | unsigned long flags; |
579 | ||
c66ac9db | 580 | if (t_state) { |
a1d8b49a | 581 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 582 | cmd->t_state = t_state; |
7d680f3b | 583 | cmd->transport_state |= CMD_T_ACTIVE; |
a1d8b49a | 584 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
585 | } |
586 | ||
587 | spin_lock_irqsave(&qobj->cmd_queue_lock, flags); | |
79a7fef2 RD |
588 | |
589 | /* If the cmd is already on the list, remove it before we add it */ | |
590 | if (!list_empty(&cmd->se_queue_node)) | |
591 | list_del(&cmd->se_queue_node); | |
592 | else | |
593 | atomic_inc(&qobj->queue_cnt); | |
594 | ||
f7a5cc0b | 595 | if (at_head) |
07bde79a | 596 | list_add(&cmd->se_queue_node, &qobj->qobj_list); |
f7a5cc0b | 597 | else |
07bde79a | 598 | list_add_tail(&cmd->se_queue_node, &qobj->qobj_list); |
7d680f3b | 599 | cmd->transport_state |= CMD_T_QUEUED; |
c66ac9db NB |
600 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); |
601 | ||
c66ac9db | 602 | wake_up_interruptible(&qobj->thread_wq); |
c66ac9db NB |
603 | } |
604 | ||
5951146d AG |
605 | static struct se_cmd * |
606 | transport_get_cmd_from_queue(struct se_queue_obj *qobj) | |
c66ac9db | 607 | { |
5951146d | 608 | struct se_cmd *cmd; |
c66ac9db NB |
609 | unsigned long flags; |
610 | ||
611 | spin_lock_irqsave(&qobj->cmd_queue_lock, flags); | |
612 | if (list_empty(&qobj->qobj_list)) { | |
613 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); | |
614 | return NULL; | |
615 | } | |
5951146d | 616 | cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node); |
c66ac9db | 617 | |
7d680f3b | 618 | cmd->transport_state &= ~CMD_T_QUEUED; |
79a7fef2 | 619 | list_del_init(&cmd->se_queue_node); |
c66ac9db NB |
620 | atomic_dec(&qobj->queue_cnt); |
621 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); | |
622 | ||
5951146d | 623 | return cmd; |
c66ac9db NB |
624 | } |
625 | ||
3df8d40b | 626 | static void transport_remove_cmd_from_queue(struct se_cmd *cmd) |
c66ac9db | 627 | { |
3df8d40b | 628 | struct se_queue_obj *qobj = &cmd->se_dev->dev_queue_obj; |
c66ac9db NB |
629 | unsigned long flags; |
630 | ||
631 | spin_lock_irqsave(&qobj->cmd_queue_lock, flags); | |
7d680f3b | 632 | if (!(cmd->transport_state & CMD_T_QUEUED)) { |
c66ac9db NB |
633 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); |
634 | return; | |
635 | } | |
7d680f3b | 636 | cmd->transport_state &= ~CMD_T_QUEUED; |
79a7fef2 RD |
637 | atomic_dec(&qobj->queue_cnt); |
638 | list_del_init(&cmd->se_queue_node); | |
c66ac9db | 639 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); |
c66ac9db NB |
640 | } |
641 | ||
642 | /* | |
643 | * Completion function used by TCM subsystem plugins (such as FILEIO) | |
644 | * for queueing up response from struct se_subsystem_api->do_task() | |
645 | */ | |
646 | void transport_complete_sync_cache(struct se_cmd *cmd, int good) | |
647 | { | |
a1d8b49a | 648 | struct se_task *task = list_entry(cmd->t_task_list.next, |
c66ac9db NB |
649 | struct se_task, t_list); |
650 | ||
651 | if (good) { | |
652 | cmd->scsi_status = SAM_STAT_GOOD; | |
653 | task->task_scsi_status = GOOD; | |
654 | } else { | |
655 | task->task_scsi_status = SAM_STAT_CHECK_CONDITION; | |
03e98c9e NB |
656 | task->task_se_cmd->scsi_sense_reason = |
657 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
658 | ||
c66ac9db NB |
659 | } |
660 | ||
661 | transport_complete_task(task, good); | |
662 | } | |
663 | EXPORT_SYMBOL(transport_complete_sync_cache); | |
664 | ||
35e0e757 CH |
665 | static void target_complete_failure_work(struct work_struct *work) |
666 | { | |
667 | struct se_cmd *cmd = container_of(work, struct se_cmd, work); | |
668 | ||
03e98c9e | 669 | transport_generic_request_failure(cmd); |
35e0e757 CH |
670 | } |
671 | ||
c66ac9db NB |
672 | /* transport_complete_task(): |
673 | * | |
674 | * Called from interrupt and non interrupt context depending | |
675 | * on the transport plugin. | |
676 | */ | |
677 | void transport_complete_task(struct se_task *task, int success) | |
678 | { | |
e3d6f909 | 679 | struct se_cmd *cmd = task->task_se_cmd; |
42bf829e | 680 | struct se_device *dev = cmd->se_dev; |
c66ac9db | 681 | unsigned long flags; |
c66ac9db | 682 | |
a1d8b49a | 683 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
6c76bf95 | 684 | task->task_flags &= ~TF_ACTIVE; |
c66ac9db NB |
685 | |
686 | /* | |
687 | * See if any sense data exists, if so set the TASK_SENSE flag. | |
688 | * Also check for any other post completion work that needs to be | |
689 | * done by the plugins. | |
690 | */ | |
691 | if (dev && dev->transport->transport_complete) { | |
692 | if (dev->transport->transport_complete(task) != 0) { | |
693 | cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE; | |
ef804a84 | 694 | task->task_flags |= TF_HAS_SENSE; |
c66ac9db NB |
695 | success = 1; |
696 | } | |
697 | } | |
698 | ||
699 | /* | |
700 | * See if we are waiting for outstanding struct se_task | |
701 | * to complete for an exception condition | |
702 | */ | |
6c76bf95 | 703 | if (task->task_flags & TF_REQUEST_STOP) { |
a1d8b49a | 704 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
705 | complete(&task->task_stop_comp); |
706 | return; | |
707 | } | |
2235007c CH |
708 | |
709 | if (!success) | |
7d680f3b | 710 | cmd->transport_state |= CMD_T_FAILED; |
2235007c | 711 | |
c66ac9db NB |
712 | /* |
713 | * Decrement the outstanding t_task_cdbs_left count. The last | |
714 | * struct se_task from struct se_cmd will complete itself into the | |
715 | * device queue depending upon int success. | |
716 | */ | |
6708bb27 | 717 | if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) { |
a1d8b49a | 718 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
719 | return; |
720 | } | |
721 | ||
7d680f3b | 722 | if (cmd->transport_state & CMD_T_FAILED) { |
41e16e98 | 723 | cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
35e0e757 | 724 | INIT_WORK(&cmd->work, target_complete_failure_work); |
c66ac9db | 725 | } else { |
7d680f3b | 726 | cmd->transport_state |= CMD_T_COMPLETE; |
35e0e757 | 727 | INIT_WORK(&cmd->work, target_complete_ok_work); |
c66ac9db | 728 | } |
35e0e757 | 729 | |
35e0e757 | 730 | cmd->t_state = TRANSPORT_COMPLETE; |
7d680f3b | 731 | cmd->transport_state |= CMD_T_ACTIVE; |
a1d8b49a | 732 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 733 | |
35e0e757 | 734 | queue_work(target_completion_wq, &cmd->work); |
c66ac9db NB |
735 | } |
736 | EXPORT_SYMBOL(transport_complete_task); | |
737 | ||
738 | /* | |
739 | * Called by transport_add_tasks_from_cmd() once a struct se_cmd's | |
740 | * struct se_task list are ready to be added to the active execution list | |
741 | * struct se_device | |
742 | ||
743 | * Called with se_dev_t->execute_task_lock called. | |
744 | */ | |
745 | static inline int transport_add_task_check_sam_attr( | |
746 | struct se_task *task, | |
747 | struct se_task *task_prev, | |
748 | struct se_device *dev) | |
749 | { | |
750 | /* | |
751 | * No SAM Task attribute emulation enabled, add to tail of | |
752 | * execution queue | |
753 | */ | |
754 | if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) { | |
755 | list_add_tail(&task->t_execute_list, &dev->execute_task_list); | |
756 | return 0; | |
757 | } | |
758 | /* | |
759 | * HEAD_OF_QUEUE attribute for received CDB, which means | |
760 | * the first task that is associated with a struct se_cmd goes to | |
761 | * head of the struct se_device->execute_task_list, and task_prev | |
762 | * after that for each subsequent task | |
763 | */ | |
e66ecd50 | 764 | if (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG) { |
c66ac9db NB |
765 | list_add(&task->t_execute_list, |
766 | (task_prev != NULL) ? | |
767 | &task_prev->t_execute_list : | |
768 | &dev->execute_task_list); | |
769 | ||
6708bb27 | 770 | pr_debug("Set HEAD_OF_QUEUE for task CDB: 0x%02x" |
c66ac9db | 771 | " in execution queue\n", |
6708bb27 | 772 | task->task_se_cmd->t_task_cdb[0]); |
c66ac9db NB |
773 | return 1; |
774 | } | |
775 | /* | |
776 | * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been | |
777 | * transitioned from Dermant -> Active state, and are added to the end | |
778 | * of the struct se_device->execute_task_list | |
779 | */ | |
780 | list_add_tail(&task->t_execute_list, &dev->execute_task_list); | |
781 | return 0; | |
782 | } | |
783 | ||
784 | /* __transport_add_task_to_execute_queue(): | |
785 | * | |
786 | * Called with se_dev_t->execute_task_lock called. | |
787 | */ | |
788 | static void __transport_add_task_to_execute_queue( | |
789 | struct se_task *task, | |
790 | struct se_task *task_prev, | |
791 | struct se_device *dev) | |
792 | { | |
793 | int head_of_queue; | |
794 | ||
795 | head_of_queue = transport_add_task_check_sam_attr(task, task_prev, dev); | |
796 | atomic_inc(&dev->execute_tasks); | |
797 | ||
1880807a | 798 | if (task->t_state_active) |
c66ac9db NB |
799 | return; |
800 | /* | |
801 | * Determine if this task needs to go to HEAD_OF_QUEUE for the | |
802 | * state list as well. Running with SAM Task Attribute emulation | |
803 | * will always return head_of_queue == 0 here | |
804 | */ | |
805 | if (head_of_queue) | |
806 | list_add(&task->t_state_list, (task_prev) ? | |
807 | &task_prev->t_state_list : | |
808 | &dev->state_task_list); | |
809 | else | |
810 | list_add_tail(&task->t_state_list, &dev->state_task_list); | |
811 | ||
1880807a | 812 | task->t_state_active = true; |
c66ac9db | 813 | |
6708bb27 | 814 | pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n", |
e3d6f909 | 815 | task->task_se_cmd->se_tfo->get_task_tag(task->task_se_cmd), |
c66ac9db NB |
816 | task, dev); |
817 | } | |
818 | ||
819 | static void transport_add_tasks_to_state_queue(struct se_cmd *cmd) | |
820 | { | |
42bf829e | 821 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
822 | struct se_task *task; |
823 | unsigned long flags; | |
824 | ||
a1d8b49a AG |
825 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
826 | list_for_each_entry(task, &cmd->t_task_list, t_list) { | |
c66ac9db | 827 | spin_lock(&dev->execute_task_lock); |
1880807a CH |
828 | if (!task->t_state_active) { |
829 | list_add_tail(&task->t_state_list, | |
830 | &dev->state_task_list); | |
831 | task->t_state_active = true; | |
832 | ||
833 | pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n", | |
834 | task->task_se_cmd->se_tfo->get_task_tag( | |
835 | task->task_se_cmd), task, dev); | |
836 | } | |
c66ac9db NB |
837 | spin_unlock(&dev->execute_task_lock); |
838 | } | |
a1d8b49a | 839 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
840 | } |
841 | ||
4d2300cc | 842 | static void __transport_add_tasks_from_cmd(struct se_cmd *cmd) |
c66ac9db | 843 | { |
5951146d | 844 | struct se_device *dev = cmd->se_dev; |
c66ac9db | 845 | struct se_task *task, *task_prev = NULL; |
c66ac9db | 846 | |
a1d8b49a | 847 | list_for_each_entry(task, &cmd->t_task_list, t_list) { |
04629b7b | 848 | if (!list_empty(&task->t_execute_list)) |
c66ac9db NB |
849 | continue; |
850 | /* | |
851 | * __transport_add_task_to_execute_queue() handles the | |
852 | * SAM Task Attribute emulation if enabled | |
853 | */ | |
854 | __transport_add_task_to_execute_queue(task, task_prev, dev); | |
c66ac9db NB |
855 | task_prev = task; |
856 | } | |
4d2300cc NB |
857 | } |
858 | ||
859 | static void transport_add_tasks_from_cmd(struct se_cmd *cmd) | |
860 | { | |
861 | unsigned long flags; | |
862 | struct se_device *dev = cmd->se_dev; | |
863 | ||
864 | spin_lock_irqsave(&dev->execute_task_lock, flags); | |
865 | __transport_add_tasks_from_cmd(cmd); | |
c66ac9db | 866 | spin_unlock_irqrestore(&dev->execute_task_lock, flags); |
c66ac9db NB |
867 | } |
868 | ||
04629b7b CH |
869 | void __transport_remove_task_from_execute_queue(struct se_task *task, |
870 | struct se_device *dev) | |
871 | { | |
872 | list_del_init(&task->t_execute_list); | |
873 | atomic_dec(&dev->execute_tasks); | |
874 | } | |
875 | ||
e26d99ae | 876 | static void transport_remove_task_from_execute_queue( |
c66ac9db NB |
877 | struct se_task *task, |
878 | struct se_device *dev) | |
879 | { | |
880 | unsigned long flags; | |
881 | ||
04629b7b | 882 | if (WARN_ON(list_empty(&task->t_execute_list))) |
af57c3ac | 883 | return; |
af57c3ac | 884 | |
c66ac9db | 885 | spin_lock_irqsave(&dev->execute_task_lock, flags); |
04629b7b | 886 | __transport_remove_task_from_execute_queue(task, dev); |
c66ac9db NB |
887 | spin_unlock_irqrestore(&dev->execute_task_lock, flags); |
888 | } | |
889 | ||
07bde79a | 890 | /* |
f147abb4 | 891 | * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status |
07bde79a NB |
892 | */ |
893 | ||
894 | static void target_qf_do_work(struct work_struct *work) | |
895 | { | |
896 | struct se_device *dev = container_of(work, struct se_device, | |
897 | qf_work_queue); | |
bcac364a | 898 | LIST_HEAD(qf_cmd_list); |
07bde79a NB |
899 | struct se_cmd *cmd, *cmd_tmp; |
900 | ||
901 | spin_lock_irq(&dev->qf_cmd_lock); | |
bcac364a RD |
902 | list_splice_init(&dev->qf_cmd_list, &qf_cmd_list); |
903 | spin_unlock_irq(&dev->qf_cmd_lock); | |
07bde79a | 904 | |
bcac364a | 905 | list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) { |
07bde79a NB |
906 | list_del(&cmd->se_qf_node); |
907 | atomic_dec(&dev->dev_qf_count); | |
908 | smp_mb__after_atomic_dec(); | |
07bde79a | 909 | |
6708bb27 | 910 | pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue" |
07bde79a | 911 | " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd, |
e057f533 | 912 | (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" : |
07bde79a NB |
913 | (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING" |
914 | : "UNKNOWN"); | |
f7a5cc0b CH |
915 | |
916 | transport_add_cmd_to_queue(cmd, cmd->t_state, true); | |
07bde79a | 917 | } |
07bde79a NB |
918 | } |
919 | ||
c66ac9db NB |
920 | unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd) |
921 | { | |
922 | switch (cmd->data_direction) { | |
923 | case DMA_NONE: | |
924 | return "NONE"; | |
925 | case DMA_FROM_DEVICE: | |
926 | return "READ"; | |
927 | case DMA_TO_DEVICE: | |
928 | return "WRITE"; | |
929 | case DMA_BIDIRECTIONAL: | |
930 | return "BIDI"; | |
931 | default: | |
932 | break; | |
933 | } | |
934 | ||
935 | return "UNKNOWN"; | |
936 | } | |
937 | ||
938 | void transport_dump_dev_state( | |
939 | struct se_device *dev, | |
940 | char *b, | |
941 | int *bl) | |
942 | { | |
943 | *bl += sprintf(b + *bl, "Status: "); | |
944 | switch (dev->dev_status) { | |
945 | case TRANSPORT_DEVICE_ACTIVATED: | |
946 | *bl += sprintf(b + *bl, "ACTIVATED"); | |
947 | break; | |
948 | case TRANSPORT_DEVICE_DEACTIVATED: | |
949 | *bl += sprintf(b + *bl, "DEACTIVATED"); | |
950 | break; | |
951 | case TRANSPORT_DEVICE_SHUTDOWN: | |
952 | *bl += sprintf(b + *bl, "SHUTDOWN"); | |
953 | break; | |
954 | case TRANSPORT_DEVICE_OFFLINE_ACTIVATED: | |
955 | case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED: | |
956 | *bl += sprintf(b + *bl, "OFFLINE"); | |
957 | break; | |
958 | default: | |
959 | *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status); | |
960 | break; | |
961 | } | |
962 | ||
65586d51 NB |
963 | *bl += sprintf(b + *bl, " Execute/Max Queue Depth: %d/%d", |
964 | atomic_read(&dev->execute_tasks), dev->queue_depth); | |
c66ac9db | 965 | *bl += sprintf(b + *bl, " SectorSize: %u MaxSectors: %u\n", |
e3d6f909 | 966 | dev->se_sub_dev->se_dev_attrib.block_size, dev->se_sub_dev->se_dev_attrib.max_sectors); |
c66ac9db NB |
967 | *bl += sprintf(b + *bl, " "); |
968 | } | |
969 | ||
c66ac9db NB |
970 | void transport_dump_vpd_proto_id( |
971 | struct t10_vpd *vpd, | |
972 | unsigned char *p_buf, | |
973 | int p_buf_len) | |
974 | { | |
975 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
976 | int len; | |
977 | ||
978 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
979 | len = sprintf(buf, "T10 VPD Protocol Identifier: "); | |
980 | ||
981 | switch (vpd->protocol_identifier) { | |
982 | case 0x00: | |
983 | sprintf(buf+len, "Fibre Channel\n"); | |
984 | break; | |
985 | case 0x10: | |
986 | sprintf(buf+len, "Parallel SCSI\n"); | |
987 | break; | |
988 | case 0x20: | |
989 | sprintf(buf+len, "SSA\n"); | |
990 | break; | |
991 | case 0x30: | |
992 | sprintf(buf+len, "IEEE 1394\n"); | |
993 | break; | |
994 | case 0x40: | |
995 | sprintf(buf+len, "SCSI Remote Direct Memory Access" | |
996 | " Protocol\n"); | |
997 | break; | |
998 | case 0x50: | |
999 | sprintf(buf+len, "Internet SCSI (iSCSI)\n"); | |
1000 | break; | |
1001 | case 0x60: | |
1002 | sprintf(buf+len, "SAS Serial SCSI Protocol\n"); | |
1003 | break; | |
1004 | case 0x70: | |
1005 | sprintf(buf+len, "Automation/Drive Interface Transport" | |
1006 | " Protocol\n"); | |
1007 | break; | |
1008 | case 0x80: | |
1009 | sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n"); | |
1010 | break; | |
1011 | default: | |
1012 | sprintf(buf+len, "Unknown 0x%02x\n", | |
1013 | vpd->protocol_identifier); | |
1014 | break; | |
1015 | } | |
1016 | ||
1017 | if (p_buf) | |
1018 | strncpy(p_buf, buf, p_buf_len); | |
1019 | else | |
6708bb27 | 1020 | pr_debug("%s", buf); |
c66ac9db NB |
1021 | } |
1022 | ||
1023 | void | |
1024 | transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83) | |
1025 | { | |
1026 | /* | |
1027 | * Check if the Protocol Identifier Valid (PIV) bit is set.. | |
1028 | * | |
1029 | * from spc3r23.pdf section 7.5.1 | |
1030 | */ | |
1031 | if (page_83[1] & 0x80) { | |
1032 | vpd->protocol_identifier = (page_83[0] & 0xf0); | |
1033 | vpd->protocol_identifier_set = 1; | |
1034 | transport_dump_vpd_proto_id(vpd, NULL, 0); | |
1035 | } | |
1036 | } | |
1037 | EXPORT_SYMBOL(transport_set_vpd_proto_id); | |
1038 | ||
1039 | int transport_dump_vpd_assoc( | |
1040 | struct t10_vpd *vpd, | |
1041 | unsigned char *p_buf, | |
1042 | int p_buf_len) | |
1043 | { | |
1044 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
e3d6f909 AG |
1045 | int ret = 0; |
1046 | int len; | |
c66ac9db NB |
1047 | |
1048 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
1049 | len = sprintf(buf, "T10 VPD Identifier Association: "); | |
1050 | ||
1051 | switch (vpd->association) { | |
1052 | case 0x00: | |
1053 | sprintf(buf+len, "addressed logical unit\n"); | |
1054 | break; | |
1055 | case 0x10: | |
1056 | sprintf(buf+len, "target port\n"); | |
1057 | break; | |
1058 | case 0x20: | |
1059 | sprintf(buf+len, "SCSI target device\n"); | |
1060 | break; | |
1061 | default: | |
1062 | sprintf(buf+len, "Unknown 0x%02x\n", vpd->association); | |
e3d6f909 | 1063 | ret = -EINVAL; |
c66ac9db NB |
1064 | break; |
1065 | } | |
1066 | ||
1067 | if (p_buf) | |
1068 | strncpy(p_buf, buf, p_buf_len); | |
1069 | else | |
6708bb27 | 1070 | pr_debug("%s", buf); |
c66ac9db NB |
1071 | |
1072 | return ret; | |
1073 | } | |
1074 | ||
1075 | int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83) | |
1076 | { | |
1077 | /* | |
1078 | * The VPD identification association.. | |
1079 | * | |
1080 | * from spc3r23.pdf Section 7.6.3.1 Table 297 | |
1081 | */ | |
1082 | vpd->association = (page_83[1] & 0x30); | |
1083 | return transport_dump_vpd_assoc(vpd, NULL, 0); | |
1084 | } | |
1085 | EXPORT_SYMBOL(transport_set_vpd_assoc); | |
1086 | ||
1087 | int transport_dump_vpd_ident_type( | |
1088 | struct t10_vpd *vpd, | |
1089 | unsigned char *p_buf, | |
1090 | int p_buf_len) | |
1091 | { | |
1092 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
e3d6f909 AG |
1093 | int ret = 0; |
1094 | int len; | |
c66ac9db NB |
1095 | |
1096 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
1097 | len = sprintf(buf, "T10 VPD Identifier Type: "); | |
1098 | ||
1099 | switch (vpd->device_identifier_type) { | |
1100 | case 0x00: | |
1101 | sprintf(buf+len, "Vendor specific\n"); | |
1102 | break; | |
1103 | case 0x01: | |
1104 | sprintf(buf+len, "T10 Vendor ID based\n"); | |
1105 | break; | |
1106 | case 0x02: | |
1107 | sprintf(buf+len, "EUI-64 based\n"); | |
1108 | break; | |
1109 | case 0x03: | |
1110 | sprintf(buf+len, "NAA\n"); | |
1111 | break; | |
1112 | case 0x04: | |
1113 | sprintf(buf+len, "Relative target port identifier\n"); | |
1114 | break; | |
1115 | case 0x08: | |
1116 | sprintf(buf+len, "SCSI name string\n"); | |
1117 | break; | |
1118 | default: | |
1119 | sprintf(buf+len, "Unsupported: 0x%02x\n", | |
1120 | vpd->device_identifier_type); | |
e3d6f909 | 1121 | ret = -EINVAL; |
c66ac9db NB |
1122 | break; |
1123 | } | |
1124 | ||
e3d6f909 AG |
1125 | if (p_buf) { |
1126 | if (p_buf_len < strlen(buf)+1) | |
1127 | return -EINVAL; | |
c66ac9db | 1128 | strncpy(p_buf, buf, p_buf_len); |
e3d6f909 | 1129 | } else { |
6708bb27 | 1130 | pr_debug("%s", buf); |
e3d6f909 | 1131 | } |
c66ac9db NB |
1132 | |
1133 | return ret; | |
1134 | } | |
1135 | ||
1136 | int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83) | |
1137 | { | |
1138 | /* | |
1139 | * The VPD identifier type.. | |
1140 | * | |
1141 | * from spc3r23.pdf Section 7.6.3.1 Table 298 | |
1142 | */ | |
1143 | vpd->device_identifier_type = (page_83[1] & 0x0f); | |
1144 | return transport_dump_vpd_ident_type(vpd, NULL, 0); | |
1145 | } | |
1146 | EXPORT_SYMBOL(transport_set_vpd_ident_type); | |
1147 | ||
1148 | int transport_dump_vpd_ident( | |
1149 | struct t10_vpd *vpd, | |
1150 | unsigned char *p_buf, | |
1151 | int p_buf_len) | |
1152 | { | |
1153 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
1154 | int ret = 0; | |
1155 | ||
1156 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
1157 | ||
1158 | switch (vpd->device_identifier_code_set) { | |
1159 | case 0x01: /* Binary */ | |
1160 | sprintf(buf, "T10 VPD Binary Device Identifier: %s\n", | |
1161 | &vpd->device_identifier[0]); | |
1162 | break; | |
1163 | case 0x02: /* ASCII */ | |
1164 | sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n", | |
1165 | &vpd->device_identifier[0]); | |
1166 | break; | |
1167 | case 0x03: /* UTF-8 */ | |
1168 | sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n", | |
1169 | &vpd->device_identifier[0]); | |
1170 | break; | |
1171 | default: | |
1172 | sprintf(buf, "T10 VPD Device Identifier encoding unsupported:" | |
1173 | " 0x%02x", vpd->device_identifier_code_set); | |
e3d6f909 | 1174 | ret = -EINVAL; |
c66ac9db NB |
1175 | break; |
1176 | } | |
1177 | ||
1178 | if (p_buf) | |
1179 | strncpy(p_buf, buf, p_buf_len); | |
1180 | else | |
6708bb27 | 1181 | pr_debug("%s", buf); |
c66ac9db NB |
1182 | |
1183 | return ret; | |
1184 | } | |
1185 | ||
1186 | int | |
1187 | transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83) | |
1188 | { | |
1189 | static const char hex_str[] = "0123456789abcdef"; | |
1190 | int j = 0, i = 4; /* offset to start of the identifer */ | |
1191 | ||
1192 | /* | |
1193 | * The VPD Code Set (encoding) | |
1194 | * | |
1195 | * from spc3r23.pdf Section 7.6.3.1 Table 296 | |
1196 | */ | |
1197 | vpd->device_identifier_code_set = (page_83[0] & 0x0f); | |
1198 | switch (vpd->device_identifier_code_set) { | |
1199 | case 0x01: /* Binary */ | |
1200 | vpd->device_identifier[j++] = | |
1201 | hex_str[vpd->device_identifier_type]; | |
1202 | while (i < (4 + page_83[3])) { | |
1203 | vpd->device_identifier[j++] = | |
1204 | hex_str[(page_83[i] & 0xf0) >> 4]; | |
1205 | vpd->device_identifier[j++] = | |
1206 | hex_str[page_83[i] & 0x0f]; | |
1207 | i++; | |
1208 | } | |
1209 | break; | |
1210 | case 0x02: /* ASCII */ | |
1211 | case 0x03: /* UTF-8 */ | |
1212 | while (i < (4 + page_83[3])) | |
1213 | vpd->device_identifier[j++] = page_83[i++]; | |
1214 | break; | |
1215 | default: | |
1216 | break; | |
1217 | } | |
1218 | ||
1219 | return transport_dump_vpd_ident(vpd, NULL, 0); | |
1220 | } | |
1221 | EXPORT_SYMBOL(transport_set_vpd_ident); | |
1222 | ||
1223 | static void core_setup_task_attr_emulation(struct se_device *dev) | |
1224 | { | |
1225 | /* | |
1226 | * If this device is from Target_Core_Mod/pSCSI, disable the | |
1227 | * SAM Task Attribute emulation. | |
1228 | * | |
1229 | * This is currently not available in upsream Linux/SCSI Target | |
1230 | * mode code, and is assumed to be disabled while using TCM/pSCSI. | |
1231 | */ | |
e3d6f909 | 1232 | if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) { |
c66ac9db NB |
1233 | dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH; |
1234 | return; | |
1235 | } | |
1236 | ||
1237 | dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED; | |
6708bb27 | 1238 | pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x" |
e3d6f909 AG |
1239 | " device\n", dev->transport->name, |
1240 | dev->transport->get_device_rev(dev)); | |
c66ac9db NB |
1241 | } |
1242 | ||
1243 | static void scsi_dump_inquiry(struct se_device *dev) | |
1244 | { | |
e3d6f909 | 1245 | struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn; |
e59a41b6 | 1246 | char buf[17]; |
c66ac9db NB |
1247 | int i, device_type; |
1248 | /* | |
1249 | * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer | |
1250 | */ | |
c66ac9db NB |
1251 | for (i = 0; i < 8; i++) |
1252 | if (wwn->vendor[i] >= 0x20) | |
e59a41b6 | 1253 | buf[i] = wwn->vendor[i]; |
c66ac9db | 1254 | else |
e59a41b6 SAS |
1255 | buf[i] = ' '; |
1256 | buf[i] = '\0'; | |
1257 | pr_debug(" Vendor: %s\n", buf); | |
c66ac9db | 1258 | |
c66ac9db NB |
1259 | for (i = 0; i < 16; i++) |
1260 | if (wwn->model[i] >= 0x20) | |
e59a41b6 | 1261 | buf[i] = wwn->model[i]; |
c66ac9db | 1262 | else |
e59a41b6 SAS |
1263 | buf[i] = ' '; |
1264 | buf[i] = '\0'; | |
1265 | pr_debug(" Model: %s\n", buf); | |
c66ac9db | 1266 | |
c66ac9db NB |
1267 | for (i = 0; i < 4; i++) |
1268 | if (wwn->revision[i] >= 0x20) | |
e59a41b6 | 1269 | buf[i] = wwn->revision[i]; |
c66ac9db | 1270 | else |
e59a41b6 SAS |
1271 | buf[i] = ' '; |
1272 | buf[i] = '\0'; | |
1273 | pr_debug(" Revision: %s\n", buf); | |
c66ac9db | 1274 | |
e3d6f909 | 1275 | device_type = dev->transport->get_device_type(dev); |
6708bb27 AG |
1276 | pr_debug(" Type: %s ", scsi_device_type(device_type)); |
1277 | pr_debug(" ANSI SCSI revision: %02x\n", | |
e3d6f909 | 1278 | dev->transport->get_device_rev(dev)); |
c66ac9db NB |
1279 | } |
1280 | ||
1281 | struct se_device *transport_add_device_to_core_hba( | |
1282 | struct se_hba *hba, | |
1283 | struct se_subsystem_api *transport, | |
1284 | struct se_subsystem_dev *se_dev, | |
1285 | u32 device_flags, | |
1286 | void *transport_dev, | |
1287 | struct se_dev_limits *dev_limits, | |
1288 | const char *inquiry_prod, | |
1289 | const char *inquiry_rev) | |
1290 | { | |
12a18bdc | 1291 | int force_pt; |
c66ac9db NB |
1292 | struct se_device *dev; |
1293 | ||
1294 | dev = kzalloc(sizeof(struct se_device), GFP_KERNEL); | |
6708bb27 AG |
1295 | if (!dev) { |
1296 | pr_err("Unable to allocate memory for se_dev_t\n"); | |
c66ac9db NB |
1297 | return NULL; |
1298 | } | |
c66ac9db | 1299 | |
e3d6f909 | 1300 | transport_init_queue_obj(&dev->dev_queue_obj); |
c66ac9db NB |
1301 | dev->dev_flags = device_flags; |
1302 | dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED; | |
5951146d | 1303 | dev->dev_ptr = transport_dev; |
c66ac9db NB |
1304 | dev->se_hba = hba; |
1305 | dev->se_sub_dev = se_dev; | |
1306 | dev->transport = transport; | |
c66ac9db NB |
1307 | INIT_LIST_HEAD(&dev->dev_list); |
1308 | INIT_LIST_HEAD(&dev->dev_sep_list); | |
1309 | INIT_LIST_HEAD(&dev->dev_tmr_list); | |
1310 | INIT_LIST_HEAD(&dev->execute_task_list); | |
1311 | INIT_LIST_HEAD(&dev->delayed_cmd_list); | |
c66ac9db | 1312 | INIT_LIST_HEAD(&dev->state_task_list); |
07bde79a | 1313 | INIT_LIST_HEAD(&dev->qf_cmd_list); |
c66ac9db NB |
1314 | spin_lock_init(&dev->execute_task_lock); |
1315 | spin_lock_init(&dev->delayed_cmd_lock); | |
c66ac9db NB |
1316 | spin_lock_init(&dev->dev_reservation_lock); |
1317 | spin_lock_init(&dev->dev_status_lock); | |
c66ac9db NB |
1318 | spin_lock_init(&dev->se_port_lock); |
1319 | spin_lock_init(&dev->se_tmr_lock); | |
07bde79a | 1320 | spin_lock_init(&dev->qf_cmd_lock); |
c66ac9db NB |
1321 | atomic_set(&dev->dev_ordered_id, 0); |
1322 | ||
1323 | se_dev_set_default_attribs(dev, dev_limits); | |
1324 | ||
1325 | dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX); | |
1326 | dev->creation_time = get_jiffies_64(); | |
1327 | spin_lock_init(&dev->stats_lock); | |
1328 | ||
1329 | spin_lock(&hba->device_lock); | |
1330 | list_add_tail(&dev->dev_list, &hba->hba_dev_list); | |
1331 | hba->dev_count++; | |
1332 | spin_unlock(&hba->device_lock); | |
1333 | /* | |
1334 | * Setup the SAM Task Attribute emulation for struct se_device | |
1335 | */ | |
1336 | core_setup_task_attr_emulation(dev); | |
1337 | /* | |
1338 | * Force PR and ALUA passthrough emulation with internal object use. | |
1339 | */ | |
1340 | force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE); | |
1341 | /* | |
1342 | * Setup the Reservations infrastructure for struct se_device | |
1343 | */ | |
1344 | core_setup_reservations(dev, force_pt); | |
1345 | /* | |
1346 | * Setup the Asymmetric Logical Unit Assignment for struct se_device | |
1347 | */ | |
1348 | if (core_setup_alua(dev, force_pt) < 0) | |
1349 | goto out; | |
1350 | ||
1351 | /* | |
1352 | * Startup the struct se_device processing thread | |
1353 | */ | |
1354 | dev->process_thread = kthread_run(transport_processing_thread, dev, | |
e3d6f909 | 1355 | "LIO_%s", dev->transport->name); |
c66ac9db | 1356 | if (IS_ERR(dev->process_thread)) { |
6708bb27 | 1357 | pr_err("Unable to create kthread: LIO_%s\n", |
e3d6f909 | 1358 | dev->transport->name); |
c66ac9db NB |
1359 | goto out; |
1360 | } | |
07bde79a NB |
1361 | /* |
1362 | * Setup work_queue for QUEUE_FULL | |
1363 | */ | |
1364 | INIT_WORK(&dev->qf_work_queue, target_qf_do_work); | |
c66ac9db NB |
1365 | /* |
1366 | * Preload the initial INQUIRY const values if we are doing | |
1367 | * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI | |
1368 | * passthrough because this is being provided by the backend LLD. | |
1369 | * This is required so that transport_get_inquiry() copies these | |
1370 | * originals once back into DEV_T10_WWN(dev) for the virtual device | |
1371 | * setup. | |
1372 | */ | |
e3d6f909 | 1373 | if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) { |
f22c1196 | 1374 | if (!inquiry_prod || !inquiry_rev) { |
6708bb27 | 1375 | pr_err("All non TCM/pSCSI plugins require" |
c66ac9db NB |
1376 | " INQUIRY consts\n"); |
1377 | goto out; | |
1378 | } | |
1379 | ||
e3d6f909 AG |
1380 | strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8); |
1381 | strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16); | |
1382 | strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4); | |
c66ac9db NB |
1383 | } |
1384 | scsi_dump_inquiry(dev); | |
1385 | ||
12a18bdc | 1386 | return dev; |
c66ac9db | 1387 | out: |
c66ac9db NB |
1388 | kthread_stop(dev->process_thread); |
1389 | ||
1390 | spin_lock(&hba->device_lock); | |
1391 | list_del(&dev->dev_list); | |
1392 | hba->dev_count--; | |
1393 | spin_unlock(&hba->device_lock); | |
1394 | ||
1395 | se_release_vpd_for_dev(dev); | |
1396 | ||
c66ac9db NB |
1397 | kfree(dev); |
1398 | ||
1399 | return NULL; | |
1400 | } | |
1401 | EXPORT_SYMBOL(transport_add_device_to_core_hba); | |
1402 | ||
1403 | /* transport_generic_prepare_cdb(): | |
1404 | * | |
1405 | * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will | |
1406 | * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2. | |
1407 | * The point of this is since we are mapping iSCSI LUNs to | |
1408 | * SCSI Target IDs having a non-zero LUN in the CDB will throw the | |
1409 | * devices and HBAs for a loop. | |
1410 | */ | |
1411 | static inline void transport_generic_prepare_cdb( | |
1412 | unsigned char *cdb) | |
1413 | { | |
1414 | switch (cdb[0]) { | |
1415 | case READ_10: /* SBC - RDProtect */ | |
1416 | case READ_12: /* SBC - RDProtect */ | |
1417 | case READ_16: /* SBC - RDProtect */ | |
1418 | case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */ | |
1419 | case VERIFY: /* SBC - VRProtect */ | |
1420 | case VERIFY_16: /* SBC - VRProtect */ | |
1421 | case WRITE_VERIFY: /* SBC - VRProtect */ | |
1422 | case WRITE_VERIFY_12: /* SBC - VRProtect */ | |
1423 | break; | |
1424 | default: | |
1425 | cdb[1] &= 0x1f; /* clear logical unit number */ | |
1426 | break; | |
1427 | } | |
1428 | } | |
1429 | ||
1430 | static struct se_task * | |
1431 | transport_generic_get_task(struct se_cmd *cmd, | |
1432 | enum dma_data_direction data_direction) | |
1433 | { | |
1434 | struct se_task *task; | |
5951146d | 1435 | struct se_device *dev = cmd->se_dev; |
c66ac9db | 1436 | |
6708bb27 | 1437 | task = dev->transport->alloc_task(cmd->t_task_cdb); |
c66ac9db | 1438 | if (!task) { |
6708bb27 | 1439 | pr_err("Unable to allocate struct se_task\n"); |
c66ac9db NB |
1440 | return NULL; |
1441 | } | |
1442 | ||
1443 | INIT_LIST_HEAD(&task->t_list); | |
1444 | INIT_LIST_HEAD(&task->t_execute_list); | |
1445 | INIT_LIST_HEAD(&task->t_state_list); | |
1446 | init_completion(&task->task_stop_comp); | |
c66ac9db | 1447 | task->task_se_cmd = cmd; |
c66ac9db NB |
1448 | task->task_data_direction = data_direction; |
1449 | ||
c66ac9db NB |
1450 | return task; |
1451 | } | |
1452 | ||
1453 | static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *); | |
1454 | ||
c66ac9db NB |
1455 | /* |
1456 | * Used by fabric modules containing a local struct se_cmd within their | |
1457 | * fabric dependent per I/O descriptor. | |
1458 | */ | |
1459 | void transport_init_se_cmd( | |
1460 | struct se_cmd *cmd, | |
1461 | struct target_core_fabric_ops *tfo, | |
1462 | struct se_session *se_sess, | |
1463 | u32 data_length, | |
1464 | int data_direction, | |
1465 | int task_attr, | |
1466 | unsigned char *sense_buffer) | |
1467 | { | |
5951146d AG |
1468 | INIT_LIST_HEAD(&cmd->se_lun_node); |
1469 | INIT_LIST_HEAD(&cmd->se_delayed_node); | |
07bde79a | 1470 | INIT_LIST_HEAD(&cmd->se_qf_node); |
79a7fef2 | 1471 | INIT_LIST_HEAD(&cmd->se_queue_node); |
a17f091d | 1472 | INIT_LIST_HEAD(&cmd->se_cmd_list); |
a1d8b49a AG |
1473 | INIT_LIST_HEAD(&cmd->t_task_list); |
1474 | init_completion(&cmd->transport_lun_fe_stop_comp); | |
1475 | init_completion(&cmd->transport_lun_stop_comp); | |
1476 | init_completion(&cmd->t_transport_stop_comp); | |
a17f091d | 1477 | init_completion(&cmd->cmd_wait_comp); |
a1d8b49a | 1478 | spin_lock_init(&cmd->t_state_lock); |
7d680f3b | 1479 | cmd->transport_state = CMD_T_DEV_ACTIVE; |
c66ac9db NB |
1480 | |
1481 | cmd->se_tfo = tfo; | |
1482 | cmd->se_sess = se_sess; | |
1483 | cmd->data_length = data_length; | |
1484 | cmd->data_direction = data_direction; | |
1485 | cmd->sam_task_attr = task_attr; | |
1486 | cmd->sense_buffer = sense_buffer; | |
1487 | } | |
1488 | EXPORT_SYMBOL(transport_init_se_cmd); | |
1489 | ||
1490 | static int transport_check_alloc_task_attr(struct se_cmd *cmd) | |
1491 | { | |
1492 | /* | |
1493 | * Check if SAM Task Attribute emulation is enabled for this | |
1494 | * struct se_device storage object | |
1495 | */ | |
5951146d | 1496 | if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) |
c66ac9db NB |
1497 | return 0; |
1498 | ||
e66ecd50 | 1499 | if (cmd->sam_task_attr == MSG_ACA_TAG) { |
6708bb27 | 1500 | pr_debug("SAM Task Attribute ACA" |
c66ac9db | 1501 | " emulation is not supported\n"); |
e3d6f909 | 1502 | return -EINVAL; |
c66ac9db NB |
1503 | } |
1504 | /* | |
1505 | * Used to determine when ORDERED commands should go from | |
1506 | * Dormant to Active status. | |
1507 | */ | |
5951146d | 1508 | cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id); |
c66ac9db | 1509 | smp_mb__after_atomic_inc(); |
6708bb27 | 1510 | pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n", |
c66ac9db | 1511 | cmd->se_ordered_id, cmd->sam_task_attr, |
6708bb27 | 1512 | cmd->se_dev->transport->name); |
c66ac9db NB |
1513 | return 0; |
1514 | } | |
1515 | ||
c66ac9db NB |
1516 | /* transport_generic_allocate_tasks(): |
1517 | * | |
1518 | * Called from fabric RX Thread. | |
1519 | */ | |
1520 | int transport_generic_allocate_tasks( | |
1521 | struct se_cmd *cmd, | |
1522 | unsigned char *cdb) | |
1523 | { | |
1524 | int ret; | |
1525 | ||
1526 | transport_generic_prepare_cdb(cdb); | |
c66ac9db NB |
1527 | /* |
1528 | * Ensure that the received CDB is less than the max (252 + 8) bytes | |
1529 | * for VARIABLE_LENGTH_CMD | |
1530 | */ | |
1531 | if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) { | |
6708bb27 | 1532 | pr_err("Received SCSI CDB with command_size: %d that" |
c66ac9db NB |
1533 | " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n", |
1534 | scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE); | |
03e98c9e NB |
1535 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; |
1536 | cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; | |
e3d6f909 | 1537 | return -EINVAL; |
c66ac9db NB |
1538 | } |
1539 | /* | |
1540 | * If the received CDB is larger than TCM_MAX_COMMAND_SIZE, | |
1541 | * allocate the additional extended CDB buffer now.. Otherwise | |
1542 | * setup the pointer from __t_task_cdb to t_task_cdb. | |
1543 | */ | |
a1d8b49a AG |
1544 | if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) { |
1545 | cmd->t_task_cdb = kzalloc(scsi_command_size(cdb), | |
c66ac9db | 1546 | GFP_KERNEL); |
6708bb27 AG |
1547 | if (!cmd->t_task_cdb) { |
1548 | pr_err("Unable to allocate cmd->t_task_cdb" | |
a1d8b49a | 1549 | " %u > sizeof(cmd->__t_task_cdb): %lu ops\n", |
c66ac9db | 1550 | scsi_command_size(cdb), |
a1d8b49a | 1551 | (unsigned long)sizeof(cmd->__t_task_cdb)); |
03e98c9e NB |
1552 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; |
1553 | cmd->scsi_sense_reason = | |
1554 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
e3d6f909 | 1555 | return -ENOMEM; |
c66ac9db NB |
1556 | } |
1557 | } else | |
a1d8b49a | 1558 | cmd->t_task_cdb = &cmd->__t_task_cdb[0]; |
c66ac9db | 1559 | /* |
a1d8b49a | 1560 | * Copy the original CDB into cmd-> |
c66ac9db | 1561 | */ |
a1d8b49a | 1562 | memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb)); |
c66ac9db NB |
1563 | /* |
1564 | * Setup the received CDB based on SCSI defined opcodes and | |
1565 | * perform unit attention, persistent reservations and ALUA | |
a1d8b49a | 1566 | * checks for virtual device backends. The cmd->t_task_cdb |
c66ac9db NB |
1567 | * pointer is expected to be setup before we reach this point. |
1568 | */ | |
1569 | ret = transport_generic_cmd_sequencer(cmd, cdb); | |
1570 | if (ret < 0) | |
1571 | return ret; | |
1572 | /* | |
1573 | * Check for SAM Task Attribute Emulation | |
1574 | */ | |
1575 | if (transport_check_alloc_task_attr(cmd) < 0) { | |
1576 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
1577 | cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; | |
5951146d | 1578 | return -EINVAL; |
c66ac9db NB |
1579 | } |
1580 | spin_lock(&cmd->se_lun->lun_sep_lock); | |
1581 | if (cmd->se_lun->lun_sep) | |
1582 | cmd->se_lun->lun_sep->sep_stats.cmd_pdus++; | |
1583 | spin_unlock(&cmd->se_lun->lun_sep_lock); | |
1584 | return 0; | |
1585 | } | |
1586 | EXPORT_SYMBOL(transport_generic_allocate_tasks); | |
1587 | ||
695434e1 NB |
1588 | /* |
1589 | * Used by fabric module frontends to queue tasks directly. | |
1590 | * Many only be used from process context only | |
1591 | */ | |
1592 | int transport_handle_cdb_direct( | |
1593 | struct se_cmd *cmd) | |
1594 | { | |
dd8ae59d NB |
1595 | int ret; |
1596 | ||
695434e1 NB |
1597 | if (!cmd->se_lun) { |
1598 | dump_stack(); | |
6708bb27 | 1599 | pr_err("cmd->se_lun is NULL\n"); |
695434e1 NB |
1600 | return -EINVAL; |
1601 | } | |
1602 | if (in_interrupt()) { | |
1603 | dump_stack(); | |
6708bb27 | 1604 | pr_err("transport_generic_handle_cdb cannot be called" |
695434e1 NB |
1605 | " from interrupt context\n"); |
1606 | return -EINVAL; | |
1607 | } | |
dd8ae59d | 1608 | /* |
7d680f3b | 1609 | * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE following |
dd8ae59d NB |
1610 | * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue() |
1611 | * in existing usage to ensure that outstanding descriptors are handled | |
d14921d6 | 1612 | * correctly during shutdown via transport_wait_for_tasks() |
dd8ae59d NB |
1613 | * |
1614 | * Also, we don't take cmd->t_state_lock here as we only expect | |
1615 | * this to be called for initial descriptor submission. | |
1616 | */ | |
1617 | cmd->t_state = TRANSPORT_NEW_CMD; | |
7d680f3b CH |
1618 | cmd->transport_state |= CMD_T_ACTIVE; |
1619 | ||
dd8ae59d NB |
1620 | /* |
1621 | * transport_generic_new_cmd() is already handling QUEUE_FULL, | |
1622 | * so follow TRANSPORT_NEW_CMD processing thread context usage | |
1623 | * and call transport_generic_request_failure() if necessary.. | |
1624 | */ | |
1625 | ret = transport_generic_new_cmd(cmd); | |
03e98c9e NB |
1626 | if (ret < 0) |
1627 | transport_generic_request_failure(cmd); | |
1628 | ||
dd8ae59d | 1629 | return 0; |
695434e1 NB |
1630 | } |
1631 | EXPORT_SYMBOL(transport_handle_cdb_direct); | |
1632 | ||
a6360785 NB |
1633 | /** |
1634 | * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd | |
1635 | * | |
1636 | * @se_cmd: command descriptor to submit | |
1637 | * @se_sess: associated se_sess for endpoint | |
1638 | * @cdb: pointer to SCSI CDB | |
1639 | * @sense: pointer to SCSI sense buffer | |
1640 | * @unpacked_lun: unpacked LUN to reference for struct se_lun | |
1641 | * @data_length: fabric expected data transfer length | |
1642 | * @task_addr: SAM task attribute | |
1643 | * @data_dir: DMA data direction | |
1644 | * @flags: flags for command submission from target_sc_flags_tables | |
1645 | * | |
1646 | * This may only be called from process context, and also currently | |
1647 | * assumes internal allocation of fabric payload buffer by target-core. | |
1648 | **/ | |
1edcdb49 | 1649 | void target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess, |
a6360785 NB |
1650 | unsigned char *cdb, unsigned char *sense, u32 unpacked_lun, |
1651 | u32 data_length, int task_attr, int data_dir, int flags) | |
1652 | { | |
1653 | struct se_portal_group *se_tpg; | |
1654 | int rc; | |
1655 | ||
1656 | se_tpg = se_sess->se_tpg; | |
1657 | BUG_ON(!se_tpg); | |
1658 | BUG_ON(se_cmd->se_tfo || se_cmd->se_sess); | |
1659 | BUG_ON(in_interrupt()); | |
1660 | /* | |
1661 | * Initialize se_cmd for target operation. From this point | |
1662 | * exceptions are handled by sending exception status via | |
1663 | * target_core_fabric_ops->queue_status() callback | |
1664 | */ | |
1665 | transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, | |
1666 | data_length, data_dir, task_attr, sense); | |
1667 | /* | |
1668 | * Obtain struct se_cmd->cmd_kref reference and add new cmd to | |
1669 | * se_sess->sess_cmd_list. A second kref_get here is necessary | |
1670 | * for fabrics using TARGET_SCF_ACK_KREF that expect a second | |
1671 | * kref_put() to happen during fabric packet acknowledgement. | |
1672 | */ | |
1673 | target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF)); | |
1674 | /* | |
1675 | * Signal bidirectional data payloads to target-core | |
1676 | */ | |
1677 | if (flags & TARGET_SCF_BIDI_OP) | |
1678 | se_cmd->se_cmd_flags |= SCF_BIDI; | |
1679 | /* | |
1680 | * Locate se_lun pointer and attach it to struct se_cmd | |
1681 | */ | |
735703ca NB |
1682 | if (transport_lookup_cmd_lun(se_cmd, unpacked_lun) < 0) { |
1683 | transport_send_check_condition_and_sense(se_cmd, | |
1684 | se_cmd->scsi_sense_reason, 0); | |
1685 | target_put_sess_cmd(se_sess, se_cmd); | |
1686 | return; | |
1687 | } | |
a6360785 NB |
1688 | /* |
1689 | * Sanitize CDBs via transport_generic_cmd_sequencer() and | |
1690 | * allocate the necessary tasks to complete the received CDB+data | |
1691 | */ | |
1692 | rc = transport_generic_allocate_tasks(se_cmd, cdb); | |
735703ca NB |
1693 | if (rc != 0) { |
1694 | transport_generic_request_failure(se_cmd); | |
1695 | return; | |
1696 | } | |
a6360785 NB |
1697 | /* |
1698 | * Dispatch se_cmd descriptor to se_lun->lun_se_dev backend | |
1699 | * for immediate execution of READs, otherwise wait for | |
1700 | * transport_generic_handle_data() to be called for WRITEs | |
1701 | * when fabric has filled the incoming buffer. | |
1702 | */ | |
1703 | transport_handle_cdb_direct(se_cmd); | |
1edcdb49 | 1704 | return; |
a6360785 NB |
1705 | } |
1706 | EXPORT_SYMBOL(target_submit_cmd); | |
1707 | ||
c66ac9db NB |
1708 | /* |
1709 | * Used by fabric module frontends defining a TFO->new_cmd_map() caller | |
1710 | * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to | |
1711 | * complete setup in TCM process context w/ TFO->new_cmd_map(). | |
1712 | */ | |
1713 | int transport_generic_handle_cdb_map( | |
1714 | struct se_cmd *cmd) | |
1715 | { | |
e3d6f909 | 1716 | if (!cmd->se_lun) { |
c66ac9db | 1717 | dump_stack(); |
6708bb27 | 1718 | pr_err("cmd->se_lun is NULL\n"); |
e3d6f909 | 1719 | return -EINVAL; |
c66ac9db NB |
1720 | } |
1721 | ||
f7a5cc0b | 1722 | transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP, false); |
c66ac9db NB |
1723 | return 0; |
1724 | } | |
1725 | EXPORT_SYMBOL(transport_generic_handle_cdb_map); | |
1726 | ||
1727 | /* transport_generic_handle_data(): | |
1728 | * | |
1729 | * | |
1730 | */ | |
1731 | int transport_generic_handle_data( | |
1732 | struct se_cmd *cmd) | |
1733 | { | |
1734 | /* | |
1735 | * For the software fabric case, then we assume the nexus is being | |
1736 | * failed/shutdown when signals are pending from the kthread context | |
1737 | * caller, so we return a failure. For the HW target mode case running | |
1738 | * in interrupt code, the signal_pending() check is skipped. | |
1739 | */ | |
1740 | if (!in_interrupt() && signal_pending(current)) | |
e3d6f909 | 1741 | return -EPERM; |
c66ac9db NB |
1742 | /* |
1743 | * If the received CDB has aleady been ABORTED by the generic | |
1744 | * target engine, we now call transport_check_aborted_status() | |
1745 | * to queue any delated TASK_ABORTED status for the received CDB to the | |
25985edc | 1746 | * fabric module as we are expecting no further incoming DATA OUT |
c66ac9db NB |
1747 | * sequences at this point. |
1748 | */ | |
1749 | if (transport_check_aborted_status(cmd, 1) != 0) | |
1750 | return 0; | |
1751 | ||
f7a5cc0b | 1752 | transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE, false); |
c66ac9db NB |
1753 | return 0; |
1754 | } | |
1755 | EXPORT_SYMBOL(transport_generic_handle_data); | |
1756 | ||
1757 | /* transport_generic_handle_tmr(): | |
1758 | * | |
1759 | * | |
1760 | */ | |
1761 | int transport_generic_handle_tmr( | |
1762 | struct se_cmd *cmd) | |
1763 | { | |
f7a5cc0b | 1764 | transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR, false); |
c66ac9db NB |
1765 | return 0; |
1766 | } | |
1767 | EXPORT_SYMBOL(transport_generic_handle_tmr); | |
1768 | ||
cdbb70bb CH |
1769 | /* |
1770 | * If the task is active, request it to be stopped and sleep until it | |
1771 | * has completed. | |
1772 | */ | |
1773 | bool target_stop_task(struct se_task *task, unsigned long *flags) | |
1774 | { | |
1775 | struct se_cmd *cmd = task->task_se_cmd; | |
1776 | bool was_active = false; | |
1777 | ||
1778 | if (task->task_flags & TF_ACTIVE) { | |
1779 | task->task_flags |= TF_REQUEST_STOP; | |
1780 | spin_unlock_irqrestore(&cmd->t_state_lock, *flags); | |
1781 | ||
1782 | pr_debug("Task %p waiting to complete\n", task); | |
1783 | wait_for_completion(&task->task_stop_comp); | |
1784 | pr_debug("Task %p stopped successfully\n", task); | |
1785 | ||
1786 | spin_lock_irqsave(&cmd->t_state_lock, *flags); | |
1787 | atomic_dec(&cmd->t_task_cdbs_left); | |
1788 | task->task_flags &= ~(TF_ACTIVE | TF_REQUEST_STOP); | |
1789 | was_active = true; | |
1790 | } | |
1791 | ||
cdbb70bb CH |
1792 | return was_active; |
1793 | } | |
1794 | ||
c66ac9db NB |
1795 | static int transport_stop_tasks_for_cmd(struct se_cmd *cmd) |
1796 | { | |
1797 | struct se_task *task, *task_tmp; | |
1798 | unsigned long flags; | |
1799 | int ret = 0; | |
1800 | ||
6708bb27 | 1801 | pr_debug("ITT[0x%08x] - Stopping tasks\n", |
e3d6f909 | 1802 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db NB |
1803 | |
1804 | /* | |
1805 | * No tasks remain in the execution queue | |
1806 | */ | |
a1d8b49a | 1807 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 1808 | list_for_each_entry_safe(task, task_tmp, |
a1d8b49a | 1809 | &cmd->t_task_list, t_list) { |
04629b7b | 1810 | pr_debug("Processing task %p\n", task); |
c66ac9db NB |
1811 | /* |
1812 | * If the struct se_task has not been sent and is not active, | |
1813 | * remove the struct se_task from the execution queue. | |
1814 | */ | |
6c76bf95 | 1815 | if (!(task->task_flags & (TF_ACTIVE | TF_SENT))) { |
a1d8b49a | 1816 | spin_unlock_irqrestore(&cmd->t_state_lock, |
c66ac9db NB |
1817 | flags); |
1818 | transport_remove_task_from_execute_queue(task, | |
42bf829e | 1819 | cmd->se_dev); |
c66ac9db | 1820 | |
04629b7b | 1821 | pr_debug("Task %p removed from execute queue\n", task); |
a1d8b49a | 1822 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db NB |
1823 | continue; |
1824 | } | |
1825 | ||
cdbb70bb | 1826 | if (!target_stop_task(task, &flags)) { |
04629b7b | 1827 | pr_debug("Task %p - did nothing\n", task); |
c66ac9db NB |
1828 | ret++; |
1829 | } | |
c66ac9db | 1830 | } |
a1d8b49a | 1831 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
1832 | |
1833 | return ret; | |
1834 | } | |
1835 | ||
c66ac9db NB |
1836 | /* |
1837 | * Handle SAM-esque emulation for generic transport request failures. | |
1838 | */ | |
03e98c9e | 1839 | static void transport_generic_request_failure(struct se_cmd *cmd) |
c66ac9db | 1840 | { |
07bde79a NB |
1841 | int ret = 0; |
1842 | ||
6708bb27 | 1843 | pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x" |
e3d6f909 | 1844 | " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd), |
a1d8b49a | 1845 | cmd->t_task_cdb[0]); |
03e98c9e | 1846 | pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n", |
e3d6f909 | 1847 | cmd->se_tfo->get_cmd_state(cmd), |
03e98c9e | 1848 | cmd->t_state, cmd->scsi_sense_reason); |
6708bb27 | 1849 | pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d" |
c66ac9db | 1850 | " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --" |
7d680f3b CH |
1851 | " CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n", |
1852 | cmd->t_task_list_num, | |
a1d8b49a AG |
1853 | atomic_read(&cmd->t_task_cdbs_left), |
1854 | atomic_read(&cmd->t_task_cdbs_sent), | |
1855 | atomic_read(&cmd->t_task_cdbs_ex_left), | |
7d680f3b CH |
1856 | (cmd->transport_state & CMD_T_ACTIVE) != 0, |
1857 | (cmd->transport_state & CMD_T_STOP) != 0, | |
1858 | (cmd->transport_state & CMD_T_SENT) != 0); | |
c66ac9db | 1859 | |
c66ac9db NB |
1860 | /* |
1861 | * For SAM Task Attribute emulation for failed struct se_cmd | |
1862 | */ | |
1863 | if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) | |
1864 | transport_complete_task_attr(cmd); | |
1865 | ||
03e98c9e NB |
1866 | switch (cmd->scsi_sense_reason) { |
1867 | case TCM_NON_EXISTENT_LUN: | |
1868 | case TCM_UNSUPPORTED_SCSI_OPCODE: | |
1869 | case TCM_INVALID_CDB_FIELD: | |
1870 | case TCM_INVALID_PARAMETER_LIST: | |
1871 | case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE: | |
1872 | case TCM_UNKNOWN_MODE_PAGE: | |
1873 | case TCM_WRITE_PROTECTED: | |
1874 | case TCM_CHECK_CONDITION_ABORT_CMD: | |
1875 | case TCM_CHECK_CONDITION_UNIT_ATTENTION: | |
1876 | case TCM_CHECK_CONDITION_NOT_READY: | |
c66ac9db | 1877 | break; |
03e98c9e | 1878 | case TCM_RESERVATION_CONFLICT: |
c66ac9db NB |
1879 | /* |
1880 | * No SENSE Data payload for this case, set SCSI Status | |
1881 | * and queue the response to $FABRIC_MOD. | |
1882 | * | |
1883 | * Uses linux/include/scsi/scsi.h SAM status codes defs | |
1884 | */ | |
1885 | cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT; | |
1886 | /* | |
1887 | * For UA Interlock Code 11b, a RESERVATION CONFLICT will | |
1888 | * establish a UNIT ATTENTION with PREVIOUS RESERVATION | |
1889 | * CONFLICT STATUS. | |
1890 | * | |
1891 | * See spc4r17, section 7.4.6 Control Mode Page, Table 349 | |
1892 | */ | |
e3d6f909 AG |
1893 | if (cmd->se_sess && |
1894 | cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2) | |
1895 | core_scsi3_ua_allocate(cmd->se_sess->se_node_acl, | |
c66ac9db NB |
1896 | cmd->orig_fe_lun, 0x2C, |
1897 | ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS); | |
1898 | ||
07bde79a | 1899 | ret = cmd->se_tfo->queue_status(cmd); |
f147abb4 | 1900 | if (ret == -EAGAIN || ret == -ENOMEM) |
07bde79a | 1901 | goto queue_full; |
c66ac9db | 1902 | goto check_stop; |
c66ac9db | 1903 | default: |
6708bb27 | 1904 | pr_err("Unknown transport error for CDB 0x%02x: %d\n", |
03e98c9e | 1905 | cmd->t_task_cdb[0], cmd->scsi_sense_reason); |
c66ac9db NB |
1906 | cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; |
1907 | break; | |
1908 | } | |
16ab8e60 NB |
1909 | /* |
1910 | * If a fabric does not define a cmd->se_tfo->new_cmd_map caller, | |
1911 | * make the call to transport_send_check_condition_and_sense() | |
1912 | * directly. Otherwise expect the fabric to make the call to | |
1913 | * transport_send_check_condition_and_sense() after handling | |
1914 | * possible unsoliticied write data payloads. | |
1915 | */ | |
03e98c9e NB |
1916 | ret = transport_send_check_condition_and_sense(cmd, |
1917 | cmd->scsi_sense_reason, 0); | |
1918 | if (ret == -EAGAIN || ret == -ENOMEM) | |
1919 | goto queue_full; | |
07bde79a | 1920 | |
c66ac9db NB |
1921 | check_stop: |
1922 | transport_lun_remove_cmd(cmd); | |
6708bb27 | 1923 | if (!transport_cmd_check_stop_to_fabric(cmd)) |
c66ac9db | 1924 | ; |
07bde79a NB |
1925 | return; |
1926 | ||
1927 | queue_full: | |
e057f533 CH |
1928 | cmd->t_state = TRANSPORT_COMPLETE_QF_OK; |
1929 | transport_handle_queue_full(cmd, cmd->se_dev); | |
c66ac9db NB |
1930 | } |
1931 | ||
c66ac9db NB |
1932 | static inline u32 transport_lba_21(unsigned char *cdb) |
1933 | { | |
1934 | return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3]; | |
1935 | } | |
1936 | ||
1937 | static inline u32 transport_lba_32(unsigned char *cdb) | |
1938 | { | |
1939 | return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; | |
1940 | } | |
1941 | ||
1942 | static inline unsigned long long transport_lba_64(unsigned char *cdb) | |
1943 | { | |
1944 | unsigned int __v1, __v2; | |
1945 | ||
1946 | __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; | |
1947 | __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; | |
1948 | ||
1949 | return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; | |
1950 | } | |
1951 | ||
1952 | /* | |
1953 | * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs | |
1954 | */ | |
1955 | static inline unsigned long long transport_lba_64_ext(unsigned char *cdb) | |
1956 | { | |
1957 | unsigned int __v1, __v2; | |
1958 | ||
1959 | __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15]; | |
1960 | __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19]; | |
1961 | ||
1962 | return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; | |
1963 | } | |
1964 | ||
1965 | static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd) | |
1966 | { | |
1967 | unsigned long flags; | |
1968 | ||
a1d8b49a | 1969 | spin_lock_irqsave(&se_cmd->t_state_lock, flags); |
c66ac9db | 1970 | se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE; |
a1d8b49a | 1971 | spin_unlock_irqrestore(&se_cmd->t_state_lock, flags); |
c66ac9db NB |
1972 | } |
1973 | ||
c66ac9db NB |
1974 | /* |
1975 | * Called from Fabric Module context from transport_execute_tasks() | |
1976 | * | |
1977 | * The return of this function determins if the tasks from struct se_cmd | |
1978 | * get added to the execution queue in transport_execute_tasks(), | |
1979 | * or are added to the delayed or ordered lists here. | |
1980 | */ | |
1981 | static inline int transport_execute_task_attr(struct se_cmd *cmd) | |
1982 | { | |
5951146d | 1983 | if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) |
c66ac9db NB |
1984 | return 1; |
1985 | /* | |
25985edc | 1986 | * Check for the existence of HEAD_OF_QUEUE, and if true return 1 |
c66ac9db NB |
1987 | * to allow the passed struct se_cmd list of tasks to the front of the list. |
1988 | */ | |
e66ecd50 | 1989 | if (cmd->sam_task_attr == MSG_HEAD_TAG) { |
6708bb27 | 1990 | pr_debug("Added HEAD_OF_QUEUE for CDB:" |
c66ac9db | 1991 | " 0x%02x, se_ordered_id: %u\n", |
6708bb27 | 1992 | cmd->t_task_cdb[0], |
c66ac9db NB |
1993 | cmd->se_ordered_id); |
1994 | return 1; | |
e66ecd50 | 1995 | } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) { |
5951146d | 1996 | atomic_inc(&cmd->se_dev->dev_ordered_sync); |
c66ac9db NB |
1997 | smp_mb__after_atomic_inc(); |
1998 | ||
6708bb27 | 1999 | pr_debug("Added ORDERED for CDB: 0x%02x to ordered" |
c66ac9db | 2000 | " list, se_ordered_id: %u\n", |
a1d8b49a | 2001 | cmd->t_task_cdb[0], |
c66ac9db NB |
2002 | cmd->se_ordered_id); |
2003 | /* | |
2004 | * Add ORDERED command to tail of execution queue if | |
2005 | * no other older commands exist that need to be | |
2006 | * completed first. | |
2007 | */ | |
6708bb27 | 2008 | if (!atomic_read(&cmd->se_dev->simple_cmds)) |
c66ac9db NB |
2009 | return 1; |
2010 | } else { | |
2011 | /* | |
2012 | * For SIMPLE and UNTAGGED Task Attribute commands | |
2013 | */ | |
5951146d | 2014 | atomic_inc(&cmd->se_dev->simple_cmds); |
c66ac9db NB |
2015 | smp_mb__after_atomic_inc(); |
2016 | } | |
2017 | /* | |
2018 | * Otherwise if one or more outstanding ORDERED task attribute exist, | |
2019 | * add the dormant task(s) built for the passed struct se_cmd to the | |
2020 | * execution queue and become in Active state for this struct se_device. | |
2021 | */ | |
5951146d | 2022 | if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) { |
c66ac9db NB |
2023 | /* |
2024 | * Otherwise, add cmd w/ tasks to delayed cmd queue that | |
25985edc | 2025 | * will be drained upon completion of HEAD_OF_QUEUE task. |
c66ac9db | 2026 | */ |
5951146d | 2027 | spin_lock(&cmd->se_dev->delayed_cmd_lock); |
c66ac9db | 2028 | cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR; |
5951146d AG |
2029 | list_add_tail(&cmd->se_delayed_node, |
2030 | &cmd->se_dev->delayed_cmd_list); | |
2031 | spin_unlock(&cmd->se_dev->delayed_cmd_lock); | |
c66ac9db | 2032 | |
6708bb27 | 2033 | pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to" |
c66ac9db | 2034 | " delayed CMD list, se_ordered_id: %u\n", |
a1d8b49a | 2035 | cmd->t_task_cdb[0], cmd->sam_task_attr, |
c66ac9db NB |
2036 | cmd->se_ordered_id); |
2037 | /* | |
2038 | * Return zero to let transport_execute_tasks() know | |
2039 | * not to add the delayed tasks to the execution list. | |
2040 | */ | |
2041 | return 0; | |
2042 | } | |
2043 | /* | |
2044 | * Otherwise, no ORDERED task attributes exist.. | |
2045 | */ | |
2046 | return 1; | |
2047 | } | |
2048 | ||
2049 | /* | |
2050 | * Called from fabric module context in transport_generic_new_cmd() and | |
2051 | * transport_generic_process_write() | |
2052 | */ | |
2053 | static int transport_execute_tasks(struct se_cmd *cmd) | |
2054 | { | |
2055 | int add_tasks; | |
40be67f4 | 2056 | struct se_device *se_dev = cmd->se_dev; |
c66ac9db NB |
2057 | /* |
2058 | * Call transport_cmd_check_stop() to see if a fabric exception | |
25985edc | 2059 | * has occurred that prevents execution. |
c66ac9db | 2060 | */ |
6708bb27 | 2061 | if (!transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING)) { |
c66ac9db NB |
2062 | /* |
2063 | * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE | |
2064 | * attribute for the tasks of the received struct se_cmd CDB | |
2065 | */ | |
2066 | add_tasks = transport_execute_task_attr(cmd); | |
e3d6f909 | 2067 | if (!add_tasks) |
c66ac9db NB |
2068 | goto execute_tasks; |
2069 | /* | |
4d2300cc NB |
2070 | * __transport_execute_tasks() -> __transport_add_tasks_from_cmd() |
2071 | * adds associated se_tasks while holding dev->execute_task_lock | |
2072 | * before I/O dispath to avoid a double spinlock access. | |
c66ac9db | 2073 | */ |
4d2300cc NB |
2074 | __transport_execute_tasks(se_dev, cmd); |
2075 | return 0; | |
c66ac9db | 2076 | } |
4d2300cc | 2077 | |
c66ac9db | 2078 | execute_tasks: |
4d2300cc | 2079 | __transport_execute_tasks(se_dev, NULL); |
c66ac9db NB |
2080 | return 0; |
2081 | } | |
2082 | ||
2083 | /* | |
2084 | * Called to check struct se_device tcq depth window, and once open pull struct se_task | |
2085 | * from struct se_device->execute_task_list and | |
2086 | * | |
2087 | * Called from transport_processing_thread() | |
2088 | */ | |
4d2300cc | 2089 | static int __transport_execute_tasks(struct se_device *dev, struct se_cmd *new_cmd) |
c66ac9db NB |
2090 | { |
2091 | int error; | |
2092 | struct se_cmd *cmd = NULL; | |
e3d6f909 | 2093 | struct se_task *task = NULL; |
c66ac9db NB |
2094 | unsigned long flags; |
2095 | ||
c66ac9db | 2096 | check_depth: |
e3d6f909 | 2097 | spin_lock_irq(&dev->execute_task_lock); |
4d2300cc NB |
2098 | if (new_cmd != NULL) |
2099 | __transport_add_tasks_from_cmd(new_cmd); | |
2100 | ||
e3d6f909 AG |
2101 | if (list_empty(&dev->execute_task_list)) { |
2102 | spin_unlock_irq(&dev->execute_task_lock); | |
c66ac9db NB |
2103 | return 0; |
2104 | } | |
e3d6f909 AG |
2105 | task = list_first_entry(&dev->execute_task_list, |
2106 | struct se_task, t_execute_list); | |
04629b7b | 2107 | __transport_remove_task_from_execute_queue(task, dev); |
e3d6f909 | 2108 | spin_unlock_irq(&dev->execute_task_lock); |
c66ac9db | 2109 | |
e3d6f909 | 2110 | cmd = task->task_se_cmd; |
a1d8b49a | 2111 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
6c76bf95 | 2112 | task->task_flags |= (TF_ACTIVE | TF_SENT); |
a1d8b49a | 2113 | atomic_inc(&cmd->t_task_cdbs_sent); |
c66ac9db | 2114 | |
a1d8b49a AG |
2115 | if (atomic_read(&cmd->t_task_cdbs_sent) == |
2116 | cmd->t_task_list_num) | |
7d680f3b | 2117 | cmd->transport_state |= CMD_T_SENT; |
c66ac9db | 2118 | |
a1d8b49a | 2119 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 2120 | |
5bda90c8 CH |
2121 | if (cmd->execute_task) |
2122 | error = cmd->execute_task(task); | |
2123 | else | |
2124 | error = dev->transport->do_task(task); | |
d29a5b6a | 2125 | if (error != 0) { |
d29a5b6a CH |
2126 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
2127 | task->task_flags &= ~TF_ACTIVE; | |
7d680f3b | 2128 | cmd->transport_state &= ~CMD_T_SENT; |
d29a5b6a | 2129 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
7d680f3b | 2130 | |
d29a5b6a | 2131 | transport_stop_tasks_for_cmd(cmd); |
03e98c9e | 2132 | transport_generic_request_failure(cmd); |
c66ac9db NB |
2133 | } |
2134 | ||
4d2300cc | 2135 | new_cmd = NULL; |
c66ac9db NB |
2136 | goto check_depth; |
2137 | ||
2138 | return 0; | |
2139 | } | |
2140 | ||
c66ac9db NB |
2141 | static inline u32 transport_get_sectors_6( |
2142 | unsigned char *cdb, | |
2143 | struct se_cmd *cmd, | |
2144 | int *ret) | |
2145 | { | |
5951146d | 2146 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
2147 | |
2148 | /* | |
2149 | * Assume TYPE_DISK for non struct se_device objects. | |
2150 | * Use 8-bit sector value. | |
2151 | */ | |
2152 | if (!dev) | |
2153 | goto type_disk; | |
2154 | ||
2155 | /* | |
2156 | * Use 24-bit allocation length for TYPE_TAPE. | |
2157 | */ | |
e3d6f909 | 2158 | if (dev->transport->get_device_type(dev) == TYPE_TAPE) |
c66ac9db NB |
2159 | return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4]; |
2160 | ||
2161 | /* | |
2162 | * Everything else assume TYPE_DISK Sector CDB location. | |
9b5cd7f3 RD |
2163 | * Use 8-bit sector value. SBC-3 says: |
2164 | * | |
2165 | * A TRANSFER LENGTH field set to zero specifies that 256 | |
2166 | * logical blocks shall be written. Any other value | |
2167 | * specifies the number of logical blocks that shall be | |
2168 | * written. | |
c66ac9db NB |
2169 | */ |
2170 | type_disk: | |
9b5cd7f3 | 2171 | return cdb[4] ? : 256; |
c66ac9db NB |
2172 | } |
2173 | ||
2174 | static inline u32 transport_get_sectors_10( | |
2175 | unsigned char *cdb, | |
2176 | struct se_cmd *cmd, | |
2177 | int *ret) | |
2178 | { | |
5951146d | 2179 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
2180 | |
2181 | /* | |
2182 | * Assume TYPE_DISK for non struct se_device objects. | |
2183 | * Use 16-bit sector value. | |
2184 | */ | |
2185 | if (!dev) | |
2186 | goto type_disk; | |
2187 | ||
2188 | /* | |
2189 | * XXX_10 is not defined in SSC, throw an exception | |
2190 | */ | |
e3d6f909 AG |
2191 | if (dev->transport->get_device_type(dev) == TYPE_TAPE) { |
2192 | *ret = -EINVAL; | |
c66ac9db NB |
2193 | return 0; |
2194 | } | |
2195 | ||
2196 | /* | |
2197 | * Everything else assume TYPE_DISK Sector CDB location. | |
2198 | * Use 16-bit sector value. | |
2199 | */ | |
2200 | type_disk: | |
2201 | return (u32)(cdb[7] << 8) + cdb[8]; | |
2202 | } | |
2203 | ||
2204 | static inline u32 transport_get_sectors_12( | |
2205 | unsigned char *cdb, | |
2206 | struct se_cmd *cmd, | |
2207 | int *ret) | |
2208 | { | |
5951146d | 2209 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
2210 | |
2211 | /* | |
2212 | * Assume TYPE_DISK for non struct se_device objects. | |
2213 | * Use 32-bit sector value. | |
2214 | */ | |
2215 | if (!dev) | |
2216 | goto type_disk; | |
2217 | ||
2218 | /* | |
2219 | * XXX_12 is not defined in SSC, throw an exception | |
2220 | */ | |
e3d6f909 AG |
2221 | if (dev->transport->get_device_type(dev) == TYPE_TAPE) { |
2222 | *ret = -EINVAL; | |
c66ac9db NB |
2223 | return 0; |
2224 | } | |
2225 | ||
2226 | /* | |
2227 | * Everything else assume TYPE_DISK Sector CDB location. | |
2228 | * Use 32-bit sector value. | |
2229 | */ | |
2230 | type_disk: | |
2231 | return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9]; | |
2232 | } | |
2233 | ||
2234 | static inline u32 transport_get_sectors_16( | |
2235 | unsigned char *cdb, | |
2236 | struct se_cmd *cmd, | |
2237 | int *ret) | |
2238 | { | |
5951146d | 2239 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
2240 | |
2241 | /* | |
2242 | * Assume TYPE_DISK for non struct se_device objects. | |
2243 | * Use 32-bit sector value. | |
2244 | */ | |
2245 | if (!dev) | |
2246 | goto type_disk; | |
2247 | ||
2248 | /* | |
2249 | * Use 24-bit allocation length for TYPE_TAPE. | |
2250 | */ | |
e3d6f909 | 2251 | if (dev->transport->get_device_type(dev) == TYPE_TAPE) |
c66ac9db NB |
2252 | return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14]; |
2253 | ||
2254 | type_disk: | |
2255 | return (u32)(cdb[10] << 24) + (cdb[11] << 16) + | |
2256 | (cdb[12] << 8) + cdb[13]; | |
2257 | } | |
2258 | ||
2259 | /* | |
2260 | * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants | |
2261 | */ | |
2262 | static inline u32 transport_get_sectors_32( | |
2263 | unsigned char *cdb, | |
2264 | struct se_cmd *cmd, | |
2265 | int *ret) | |
2266 | { | |
2267 | /* | |
2268 | * Assume TYPE_DISK for non struct se_device objects. | |
2269 | * Use 32-bit sector value. | |
2270 | */ | |
2271 | return (u32)(cdb[28] << 24) + (cdb[29] << 16) + | |
2272 | (cdb[30] << 8) + cdb[31]; | |
2273 | ||
2274 | } | |
2275 | ||
2276 | static inline u32 transport_get_size( | |
2277 | u32 sectors, | |
2278 | unsigned char *cdb, | |
2279 | struct se_cmd *cmd) | |
2280 | { | |
5951146d | 2281 | struct se_device *dev = cmd->se_dev; |
c66ac9db | 2282 | |
e3d6f909 | 2283 | if (dev->transport->get_device_type(dev) == TYPE_TAPE) { |
c66ac9db | 2284 | if (cdb[1] & 1) { /* sectors */ |
e3d6f909 | 2285 | return dev->se_sub_dev->se_dev_attrib.block_size * sectors; |
c66ac9db NB |
2286 | } else /* bytes */ |
2287 | return sectors; | |
2288 | } | |
2289 | #if 0 | |
6708bb27 | 2290 | pr_debug("Returning block_size: %u, sectors: %u == %u for" |
e3d6f909 AG |
2291 | " %s object\n", dev->se_sub_dev->se_dev_attrib.block_size, sectors, |
2292 | dev->se_sub_dev->se_dev_attrib.block_size * sectors, | |
2293 | dev->transport->name); | |
c66ac9db | 2294 | #endif |
e3d6f909 | 2295 | return dev->se_sub_dev->se_dev_attrib.block_size * sectors; |
c66ac9db NB |
2296 | } |
2297 | ||
c66ac9db NB |
2298 | static void transport_xor_callback(struct se_cmd *cmd) |
2299 | { | |
2300 | unsigned char *buf, *addr; | |
ec98f782 | 2301 | struct scatterlist *sg; |
c66ac9db NB |
2302 | unsigned int offset; |
2303 | int i; | |
ec98f782 | 2304 | int count; |
c66ac9db NB |
2305 | /* |
2306 | * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command | |
2307 | * | |
2308 | * 1) read the specified logical block(s); | |
2309 | * 2) transfer logical blocks from the data-out buffer; | |
2310 | * 3) XOR the logical blocks transferred from the data-out buffer with | |
2311 | * the logical blocks read, storing the resulting XOR data in a buffer; | |
2312 | * 4) if the DISABLE WRITE bit is set to zero, then write the logical | |
2313 | * blocks transferred from the data-out buffer; and | |
2314 | * 5) transfer the resulting XOR data to the data-in buffer. | |
2315 | */ | |
2316 | buf = kmalloc(cmd->data_length, GFP_KERNEL); | |
6708bb27 AG |
2317 | if (!buf) { |
2318 | pr_err("Unable to allocate xor_callback buf\n"); | |
c66ac9db NB |
2319 | return; |
2320 | } | |
2321 | /* | |
ec98f782 | 2322 | * Copy the scatterlist WRITE buffer located at cmd->t_data_sg |
c66ac9db NB |
2323 | * into the locally allocated *buf |
2324 | */ | |
ec98f782 AG |
2325 | sg_copy_to_buffer(cmd->t_data_sg, |
2326 | cmd->t_data_nents, | |
2327 | buf, | |
2328 | cmd->data_length); | |
2329 | ||
c66ac9db NB |
2330 | /* |
2331 | * Now perform the XOR against the BIDI read memory located at | |
a1d8b49a | 2332 | * cmd->t_mem_bidi_list |
c66ac9db NB |
2333 | */ |
2334 | ||
2335 | offset = 0; | |
ec98f782 AG |
2336 | for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) { |
2337 | addr = kmap_atomic(sg_page(sg), KM_USER0); | |
2338 | if (!addr) | |
c66ac9db NB |
2339 | goto out; |
2340 | ||
ec98f782 AG |
2341 | for (i = 0; i < sg->length; i++) |
2342 | *(addr + sg->offset + i) ^= *(buf + offset + i); | |
c66ac9db | 2343 | |
ec98f782 | 2344 | offset += sg->length; |
c66ac9db NB |
2345 | kunmap_atomic(addr, KM_USER0); |
2346 | } | |
ec98f782 | 2347 | |
c66ac9db NB |
2348 | out: |
2349 | kfree(buf); | |
2350 | } | |
2351 | ||
2352 | /* | |
2353 | * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd | |
2354 | */ | |
2355 | static int transport_get_sense_data(struct se_cmd *cmd) | |
2356 | { | |
2357 | unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL; | |
42bf829e | 2358 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
2359 | struct se_task *task = NULL, *task_tmp; |
2360 | unsigned long flags; | |
2361 | u32 offset = 0; | |
2362 | ||
e3d6f909 AG |
2363 | WARN_ON(!cmd->se_lun); |
2364 | ||
42bf829e CH |
2365 | if (!dev) |
2366 | return 0; | |
2367 | ||
a1d8b49a | 2368 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 2369 | if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) { |
a1d8b49a | 2370 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
2371 | return 0; |
2372 | } | |
2373 | ||
2374 | list_for_each_entry_safe(task, task_tmp, | |
a1d8b49a | 2375 | &cmd->t_task_list, t_list) { |
ef804a84 | 2376 | if (!(task->task_flags & TF_HAS_SENSE)) |
c66ac9db NB |
2377 | continue; |
2378 | ||
e3d6f909 | 2379 | if (!dev->transport->get_sense_buffer) { |
6708bb27 | 2380 | pr_err("dev->transport->get_sense_buffer" |
c66ac9db NB |
2381 | " is NULL\n"); |
2382 | continue; | |
2383 | } | |
2384 | ||
e3d6f909 | 2385 | sense_buffer = dev->transport->get_sense_buffer(task); |
6708bb27 | 2386 | if (!sense_buffer) { |
04629b7b | 2387 | pr_err("ITT[0x%08x]_TASK[%p]: Unable to locate" |
c66ac9db | 2388 | " sense buffer for task with sense\n", |
04629b7b | 2389 | cmd->se_tfo->get_task_tag(cmd), task); |
c66ac9db NB |
2390 | continue; |
2391 | } | |
a1d8b49a | 2392 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 2393 | |
e3d6f909 | 2394 | offset = cmd->se_tfo->set_fabric_sense_len(cmd, |
c66ac9db NB |
2395 | TRANSPORT_SENSE_BUFFER); |
2396 | ||
5951146d | 2397 | memcpy(&buffer[offset], sense_buffer, |
c66ac9db NB |
2398 | TRANSPORT_SENSE_BUFFER); |
2399 | cmd->scsi_status = task->task_scsi_status; | |
2400 | /* Automatically padded */ | |
2401 | cmd->scsi_sense_length = | |
2402 | (TRANSPORT_SENSE_BUFFER + offset); | |
2403 | ||
6708bb27 | 2404 | pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x" |
c66ac9db | 2405 | " and sense\n", |
e3d6f909 | 2406 | dev->se_hba->hba_id, dev->transport->name, |
c66ac9db NB |
2407 | cmd->scsi_status); |
2408 | return 0; | |
2409 | } | |
a1d8b49a | 2410 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
2411 | |
2412 | return -1; | |
2413 | } | |
2414 | ||
ec98f782 AG |
2415 | static inline long long transport_dev_end_lba(struct se_device *dev) |
2416 | { | |
2417 | return dev->transport->get_blocks(dev) + 1; | |
2418 | } | |
2419 | ||
2420 | static int transport_cmd_get_valid_sectors(struct se_cmd *cmd) | |
2421 | { | |
2422 | struct se_device *dev = cmd->se_dev; | |
2423 | u32 sectors; | |
2424 | ||
2425 | if (dev->transport->get_device_type(dev) != TYPE_DISK) | |
2426 | return 0; | |
2427 | ||
2428 | sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size); | |
2429 | ||
6708bb27 AG |
2430 | if ((cmd->t_task_lba + sectors) > transport_dev_end_lba(dev)) { |
2431 | pr_err("LBA: %llu Sectors: %u exceeds" | |
ec98f782 AG |
2432 | " transport_dev_end_lba(): %llu\n", |
2433 | cmd->t_task_lba, sectors, | |
2434 | transport_dev_end_lba(dev)); | |
7abbe7f3 | 2435 | return -EINVAL; |
ec98f782 AG |
2436 | } |
2437 | ||
7abbe7f3 | 2438 | return 0; |
ec98f782 AG |
2439 | } |
2440 | ||
706d5860 NB |
2441 | static int target_check_write_same_discard(unsigned char *flags, struct se_device *dev) |
2442 | { | |
2443 | /* | |
2444 | * Determine if the received WRITE_SAME is used to for direct | |
2445 | * passthrough into Linux/SCSI with struct request via TCM/pSCSI | |
2446 | * or we are signaling the use of internal WRITE_SAME + UNMAP=1 | |
2447 | * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code. | |
2448 | */ | |
2449 | int passthrough = (dev->transport->transport_type == | |
2450 | TRANSPORT_PLUGIN_PHBA_PDEV); | |
2451 | ||
2452 | if (!passthrough) { | |
2453 | if ((flags[0] & 0x04) || (flags[0] & 0x02)) { | |
2454 | pr_err("WRITE_SAME PBDATA and LBDATA" | |
2455 | " bits not supported for Block Discard" | |
2456 | " Emulation\n"); | |
2457 | return -ENOSYS; | |
2458 | } | |
2459 | /* | |
2460 | * Currently for the emulated case we only accept | |
2461 | * tpws with the UNMAP=1 bit set. | |
2462 | */ | |
2463 | if (!(flags[0] & 0x08)) { | |
2464 | pr_err("WRITE_SAME w/o UNMAP bit not" | |
2465 | " supported for Block Discard Emulation\n"); | |
2466 | return -ENOSYS; | |
2467 | } | |
2468 | } | |
2469 | ||
2470 | return 0; | |
2471 | } | |
2472 | ||
c66ac9db NB |
2473 | /* transport_generic_cmd_sequencer(): |
2474 | * | |
2475 | * Generic Command Sequencer that should work for most DAS transport | |
2476 | * drivers. | |
2477 | * | |
2478 | * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD | |
2479 | * RX Thread. | |
2480 | * | |
2481 | * FIXME: Need to support other SCSI OPCODES where as well. | |
2482 | */ | |
2483 | static int transport_generic_cmd_sequencer( | |
2484 | struct se_cmd *cmd, | |
2485 | unsigned char *cdb) | |
2486 | { | |
5951146d | 2487 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
2488 | struct se_subsystem_dev *su_dev = dev->se_sub_dev; |
2489 | int ret = 0, sector_ret = 0, passthrough; | |
2490 | u32 sectors = 0, size = 0, pr_reg_type = 0; | |
2491 | u16 service_action; | |
2492 | u8 alua_ascq = 0; | |
2493 | /* | |
2494 | * Check for an existing UNIT ATTENTION condition | |
2495 | */ | |
2496 | if (core_scsi3_ua_check(cmd, cdb) < 0) { | |
c66ac9db NB |
2497 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; |
2498 | cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION; | |
5951146d | 2499 | return -EINVAL; |
c66ac9db NB |
2500 | } |
2501 | /* | |
2502 | * Check status of Asymmetric Logical Unit Assignment port | |
2503 | */ | |
e3d6f909 | 2504 | ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq); |
c66ac9db | 2505 | if (ret != 0) { |
c66ac9db | 2506 | /* |
25985edc | 2507 | * Set SCSI additional sense code (ASC) to 'LUN Not Accessible'; |
c66ac9db NB |
2508 | * The ALUA additional sense code qualifier (ASCQ) is determined |
2509 | * by the ALUA primary or secondary access state.. | |
2510 | */ | |
2511 | if (ret > 0) { | |
2512 | #if 0 | |
6708bb27 | 2513 | pr_debug("[%s]: ALUA TG Port not available," |
c66ac9db | 2514 | " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n", |
e3d6f909 | 2515 | cmd->se_tfo->get_fabric_name(), alua_ascq); |
c66ac9db NB |
2516 | #endif |
2517 | transport_set_sense_codes(cmd, 0x04, alua_ascq); | |
2518 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
2519 | cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY; | |
5951146d | 2520 | return -EINVAL; |
c66ac9db NB |
2521 | } |
2522 | goto out_invalid_cdb_field; | |
2523 | } | |
2524 | /* | |
2525 | * Check status for SPC-3 Persistent Reservations | |
2526 | */ | |
e3d6f909 AG |
2527 | if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type) != 0) { |
2528 | if (su_dev->t10_pr.pr_ops.t10_seq_non_holder( | |
03e98c9e NB |
2529 | cmd, cdb, pr_reg_type) != 0) { |
2530 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
2531 | cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT; | |
2532 | cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; | |
2533 | return -EBUSY; | |
2534 | } | |
c66ac9db NB |
2535 | /* |
2536 | * This means the CDB is allowed for the SCSI Initiator port | |
2537 | * when said port is *NOT* holding the legacy SPC-2 or | |
2538 | * SPC-3 Persistent Reservation. | |
2539 | */ | |
2540 | } | |
2541 | ||
5bda90c8 CH |
2542 | /* |
2543 | * If we operate in passthrough mode we skip most CDB emulation and | |
2544 | * instead hand the commands down to the physical SCSI device. | |
2545 | */ | |
2546 | passthrough = | |
2547 | (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV); | |
2548 | ||
c66ac9db NB |
2549 | switch (cdb[0]) { |
2550 | case READ_6: | |
2551 | sectors = transport_get_sectors_6(cdb, cmd, §or_ret); | |
2552 | if (sector_ret) | |
2553 | goto out_unsupported_cdb; | |
2554 | size = transport_get_size(sectors, cdb, cmd); | |
a1d8b49a | 2555 | cmd->t_task_lba = transport_lba_21(cdb); |
c66ac9db NB |
2556 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2557 | break; | |
2558 | case READ_10: | |
2559 | sectors = transport_get_sectors_10(cdb, cmd, §or_ret); | |
2560 | if (sector_ret) | |
2561 | goto out_unsupported_cdb; | |
2562 | size = transport_get_size(sectors, cdb, cmd); | |
a1d8b49a | 2563 | cmd->t_task_lba = transport_lba_32(cdb); |
c66ac9db NB |
2564 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2565 | break; | |
2566 | case READ_12: | |
2567 | sectors = transport_get_sectors_12(cdb, cmd, §or_ret); | |
2568 | if (sector_ret) | |
2569 | goto out_unsupported_cdb; | |
2570 | size = transport_get_size(sectors, cdb, cmd); | |
a1d8b49a | 2571 | cmd->t_task_lba = transport_lba_32(cdb); |
c66ac9db NB |
2572 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2573 | break; | |
2574 | case READ_16: | |
2575 | sectors = transport_get_sectors_16(cdb, cmd, §or_ret); | |
2576 | if (sector_ret) | |
2577 | goto out_unsupported_cdb; | |
2578 | size = transport_get_size(sectors, cdb, cmd); | |
a1d8b49a | 2579 | cmd->t_task_lba = transport_lba_64(cdb); |
c66ac9db NB |
2580 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2581 | break; | |
2582 | case WRITE_6: | |
2583 | sectors = transport_get_sectors_6(cdb, cmd, §or_ret); | |
2584 | if (sector_ret) | |
2585 | goto out_unsupported_cdb; | |
2586 | size = transport_get_size(sectors, cdb, cmd); | |
a1d8b49a | 2587 | cmd->t_task_lba = transport_lba_21(cdb); |
c66ac9db NB |
2588 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2589 | break; | |
2590 | case WRITE_10: | |
2591 | sectors = transport_get_sectors_10(cdb, cmd, §or_ret); | |
2592 | if (sector_ret) | |
2593 | goto out_unsupported_cdb; | |
2594 | size = transport_get_size(sectors, cdb, cmd); | |
a1d8b49a | 2595 | cmd->t_task_lba = transport_lba_32(cdb); |
2d3a4b51 CH |
2596 | if (cdb[1] & 0x8) |
2597 | cmd->se_cmd_flags |= SCF_FUA; | |
c66ac9db NB |
2598 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2599 | break; | |
2600 | case WRITE_12: | |
2601 | sectors = transport_get_sectors_12(cdb, cmd, §or_ret); | |
2602 | if (sector_ret) | |
2603 | goto out_unsupported_cdb; | |
2604 | size = transport_get_size(sectors, cdb, cmd); | |
a1d8b49a | 2605 | cmd->t_task_lba = transport_lba_32(cdb); |
2d3a4b51 CH |
2606 | if (cdb[1] & 0x8) |
2607 | cmd->se_cmd_flags |= SCF_FUA; | |
c66ac9db NB |
2608 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2609 | break; | |
2610 | case WRITE_16: | |
2611 | sectors = transport_get_sectors_16(cdb, cmd, §or_ret); | |
2612 | if (sector_ret) | |
2613 | goto out_unsupported_cdb; | |
2614 | size = transport_get_size(sectors, cdb, cmd); | |
a1d8b49a | 2615 | cmd->t_task_lba = transport_lba_64(cdb); |
2d3a4b51 CH |
2616 | if (cdb[1] & 0x8) |
2617 | cmd->se_cmd_flags |= SCF_FUA; | |
c66ac9db NB |
2618 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2619 | break; | |
2620 | case XDWRITEREAD_10: | |
2621 | if ((cmd->data_direction != DMA_TO_DEVICE) || | |
33c3fafc | 2622 | !(cmd->se_cmd_flags & SCF_BIDI)) |
c66ac9db NB |
2623 | goto out_invalid_cdb_field; |
2624 | sectors = transport_get_sectors_10(cdb, cmd, §or_ret); | |
2625 | if (sector_ret) | |
2626 | goto out_unsupported_cdb; | |
2627 | size = transport_get_size(sectors, cdb, cmd); | |
a1d8b49a | 2628 | cmd->t_task_lba = transport_lba_32(cdb); |
c66ac9db | 2629 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
7c1c6af3 | 2630 | |
5bda90c8 CH |
2631 | /* |
2632 | * Do now allow BIDI commands for passthrough mode. | |
2633 | */ | |
2634 | if (passthrough) | |
7c1c6af3 | 2635 | goto out_unsupported_cdb; |
5bda90c8 | 2636 | |
c66ac9db | 2637 | /* |
35e0e757 | 2638 | * Setup BIDI XOR callback to be run after I/O completion. |
c66ac9db NB |
2639 | */ |
2640 | cmd->transport_complete_callback = &transport_xor_callback; | |
2d3a4b51 CH |
2641 | if (cdb[1] & 0x8) |
2642 | cmd->se_cmd_flags |= SCF_FUA; | |
c66ac9db NB |
2643 | break; |
2644 | case VARIABLE_LENGTH_CMD: | |
2645 | service_action = get_unaligned_be16(&cdb[8]); | |
c66ac9db NB |
2646 | switch (service_action) { |
2647 | case XDWRITEREAD_32: | |
2648 | sectors = transport_get_sectors_32(cdb, cmd, §or_ret); | |
2649 | if (sector_ret) | |
2650 | goto out_unsupported_cdb; | |
2651 | size = transport_get_size(sectors, cdb, cmd); | |
2652 | /* | |
2653 | * Use WRITE_32 and READ_32 opcodes for the emulated | |
2654 | * XDWRITE_READ_32 logic. | |
2655 | */ | |
a1d8b49a | 2656 | cmd->t_task_lba = transport_lba_64_ext(cdb); |
c66ac9db NB |
2657 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2658 | ||
5bda90c8 CH |
2659 | /* |
2660 | * Do now allow BIDI commands for passthrough mode. | |
2661 | */ | |
c66ac9db | 2662 | if (passthrough) |
7c1c6af3 | 2663 | goto out_unsupported_cdb; |
5bda90c8 | 2664 | |
c66ac9db | 2665 | /* |
35e0e757 CH |
2666 | * Setup BIDI XOR callback to be run during after I/O |
2667 | * completion. | |
c66ac9db NB |
2668 | */ |
2669 | cmd->transport_complete_callback = &transport_xor_callback; | |
2d3a4b51 CH |
2670 | if (cdb[1] & 0x8) |
2671 | cmd->se_cmd_flags |= SCF_FUA; | |
c66ac9db NB |
2672 | break; |
2673 | case WRITE_SAME_32: | |
2674 | sectors = transport_get_sectors_32(cdb, cmd, §or_ret); | |
2675 | if (sector_ret) | |
2676 | goto out_unsupported_cdb; | |
dd3a5ad8 | 2677 | |
6708bb27 | 2678 | if (sectors) |
12850626 | 2679 | size = transport_get_size(1, cdb, cmd); |
6708bb27 AG |
2680 | else { |
2681 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not" | |
2682 | " supported\n"); | |
2683 | goto out_invalid_cdb_field; | |
2684 | } | |
dd3a5ad8 | 2685 | |
a1d8b49a | 2686 | cmd->t_task_lba = get_unaligned_be64(&cdb[12]); |
c66ac9db NB |
2687 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
2688 | ||
706d5860 | 2689 | if (target_check_write_same_discard(&cdb[10], dev) < 0) |
67236c44 | 2690 | goto out_unsupported_cdb; |
5bda90c8 CH |
2691 | if (!passthrough) |
2692 | cmd->execute_task = target_emulate_write_same; | |
c66ac9db NB |
2693 | break; |
2694 | default: | |
6708bb27 | 2695 | pr_err("VARIABLE_LENGTH_CMD service action" |
c66ac9db NB |
2696 | " 0x%04x not supported\n", service_action); |
2697 | goto out_unsupported_cdb; | |
2698 | } | |
2699 | break; | |
e434f1f1 | 2700 | case MAINTENANCE_IN: |
e3d6f909 | 2701 | if (dev->transport->get_device_type(dev) != TYPE_ROM) { |
c66ac9db NB |
2702 | /* MAINTENANCE_IN from SCC-2 */ |
2703 | /* | |
2704 | * Check for emulated MI_REPORT_TARGET_PGS. | |
2705 | */ | |
e76a35d6 CH |
2706 | if (cdb[1] == MI_REPORT_TARGET_PGS && |
2707 | su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) { | |
2708 | cmd->execute_task = | |
2709 | target_emulate_report_target_port_groups; | |
c66ac9db NB |
2710 | } |
2711 | size = (cdb[6] << 24) | (cdb[7] << 16) | | |
2712 | (cdb[8] << 8) | cdb[9]; | |
2713 | } else { | |
2714 | /* GPCMD_SEND_KEY from multi media commands */ | |
2715 | size = (cdb[8] << 8) + cdb[9]; | |
2716 | } | |
05d1c7c0 | 2717 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2718 | break; |
2719 | case MODE_SELECT: | |
2720 | size = cdb[4]; | |
2721 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; | |
2722 | break; | |
2723 | case MODE_SELECT_10: | |
2724 | size = (cdb[7] << 8) + cdb[8]; | |
2725 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; | |
2726 | break; | |
2727 | case MODE_SENSE: | |
2728 | size = cdb[4]; | |
05d1c7c0 | 2729 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
5bda90c8 CH |
2730 | if (!passthrough) |
2731 | cmd->execute_task = target_emulate_modesense; | |
c66ac9db NB |
2732 | break; |
2733 | case MODE_SENSE_10: | |
5bda90c8 CH |
2734 | size = (cdb[7] << 8) + cdb[8]; |
2735 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; | |
2736 | if (!passthrough) | |
2737 | cmd->execute_task = target_emulate_modesense; | |
2738 | break; | |
c66ac9db NB |
2739 | case GPCMD_READ_BUFFER_CAPACITY: |
2740 | case GPCMD_SEND_OPC: | |
2741 | case LOG_SELECT: | |
2742 | case LOG_SENSE: | |
2743 | size = (cdb[7] << 8) + cdb[8]; | |
05d1c7c0 | 2744 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2745 | break; |
2746 | case READ_BLOCK_LIMITS: | |
2747 | size = READ_BLOCK_LEN; | |
05d1c7c0 | 2748 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2749 | break; |
2750 | case GPCMD_GET_CONFIGURATION: | |
2751 | case GPCMD_READ_FORMAT_CAPACITIES: | |
2752 | case GPCMD_READ_DISC_INFO: | |
2753 | case GPCMD_READ_TRACK_RZONE_INFO: | |
2754 | size = (cdb[7] << 8) + cdb[8]; | |
2755 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; | |
2756 | break; | |
2757 | case PERSISTENT_RESERVE_IN: | |
617c0e06 | 2758 | if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS) |
e76a35d6 | 2759 | cmd->execute_task = target_scsi3_emulate_pr_in; |
617c0e06 CH |
2760 | size = (cdb[7] << 8) + cdb[8]; |
2761 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; | |
2762 | break; | |
c66ac9db | 2763 | case PERSISTENT_RESERVE_OUT: |
617c0e06 | 2764 | if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS) |
e76a35d6 | 2765 | cmd->execute_task = target_scsi3_emulate_pr_out; |
c66ac9db | 2766 | size = (cdb[7] << 8) + cdb[8]; |
05d1c7c0 | 2767 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2768 | break; |
2769 | case GPCMD_MECHANISM_STATUS: | |
2770 | case GPCMD_READ_DVD_STRUCTURE: | |
2771 | size = (cdb[8] << 8) + cdb[9]; | |
2772 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; | |
2773 | break; | |
2774 | case READ_POSITION: | |
2775 | size = READ_POSITION_LEN; | |
05d1c7c0 | 2776 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db | 2777 | break; |
e434f1f1 | 2778 | case MAINTENANCE_OUT: |
e3d6f909 | 2779 | if (dev->transport->get_device_type(dev) != TYPE_ROM) { |
c66ac9db NB |
2780 | /* MAINTENANCE_OUT from SCC-2 |
2781 | * | |
2782 | * Check for emulated MO_SET_TARGET_PGS. | |
2783 | */ | |
e76a35d6 CH |
2784 | if (cdb[1] == MO_SET_TARGET_PGS && |
2785 | su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) { | |
2786 | cmd->execute_task = | |
2787 | target_emulate_set_target_port_groups; | |
c66ac9db NB |
2788 | } |
2789 | ||
2790 | size = (cdb[6] << 24) | (cdb[7] << 16) | | |
2791 | (cdb[8] << 8) | cdb[9]; | |
2792 | } else { | |
2793 | /* GPCMD_REPORT_KEY from multi media commands */ | |
2794 | size = (cdb[8] << 8) + cdb[9]; | |
2795 | } | |
05d1c7c0 | 2796 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2797 | break; |
2798 | case INQUIRY: | |
2799 | size = (cdb[3] << 8) + cdb[4]; | |
2800 | /* | |
2801 | * Do implict HEAD_OF_QUEUE processing for INQUIRY. | |
2802 | * See spc4r17 section 5.3 | |
2803 | */ | |
5951146d | 2804 | if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) |
e66ecd50 | 2805 | cmd->sam_task_attr = MSG_HEAD_TAG; |
05d1c7c0 | 2806 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
5bda90c8 CH |
2807 | if (!passthrough) |
2808 | cmd->execute_task = target_emulate_inquiry; | |
c66ac9db NB |
2809 | break; |
2810 | case READ_BUFFER: | |
2811 | size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8]; | |
05d1c7c0 | 2812 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2813 | break; |
2814 | case READ_CAPACITY: | |
2815 | size = READ_CAP_LEN; | |
05d1c7c0 | 2816 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
5bda90c8 CH |
2817 | if (!passthrough) |
2818 | cmd->execute_task = target_emulate_readcapacity; | |
c66ac9db NB |
2819 | break; |
2820 | case READ_MEDIA_SERIAL_NUMBER: | |
2821 | case SECURITY_PROTOCOL_IN: | |
2822 | case SECURITY_PROTOCOL_OUT: | |
2823 | size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; | |
05d1c7c0 | 2824 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2825 | break; |
2826 | case SERVICE_ACTION_IN: | |
5bda90c8 CH |
2827 | switch (cmd->t_task_cdb[1] & 0x1f) { |
2828 | case SAI_READ_CAPACITY_16: | |
2829 | if (!passthrough) | |
2830 | cmd->execute_task = | |
2831 | target_emulate_readcapacity_16; | |
2832 | break; | |
2833 | default: | |
2834 | if (passthrough) | |
2835 | break; | |
2836 | ||
2837 | pr_err("Unsupported SA: 0x%02x\n", | |
2838 | cmd->t_task_cdb[1] & 0x1f); | |
2839 | goto out_unsupported_cdb; | |
2840 | } | |
2841 | /*FALLTHROUGH*/ | |
c66ac9db NB |
2842 | case ACCESS_CONTROL_IN: |
2843 | case ACCESS_CONTROL_OUT: | |
2844 | case EXTENDED_COPY: | |
2845 | case READ_ATTRIBUTE: | |
2846 | case RECEIVE_COPY_RESULTS: | |
2847 | case WRITE_ATTRIBUTE: | |
2848 | size = (cdb[10] << 24) | (cdb[11] << 16) | | |
2849 | (cdb[12] << 8) | cdb[13]; | |
05d1c7c0 | 2850 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2851 | break; |
2852 | case RECEIVE_DIAGNOSTIC: | |
2853 | case SEND_DIAGNOSTIC: | |
2854 | size = (cdb[3] << 8) | cdb[4]; | |
05d1c7c0 | 2855 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2856 | break; |
2857 | /* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */ | |
2858 | #if 0 | |
2859 | case GPCMD_READ_CD: | |
2860 | sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8]; | |
2861 | size = (2336 * sectors); | |
05d1c7c0 | 2862 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2863 | break; |
2864 | #endif | |
2865 | case READ_TOC: | |
2866 | size = cdb[8]; | |
05d1c7c0 | 2867 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2868 | break; |
2869 | case REQUEST_SENSE: | |
2870 | size = cdb[4]; | |
05d1c7c0 | 2871 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
5bda90c8 CH |
2872 | if (!passthrough) |
2873 | cmd->execute_task = target_emulate_request_sense; | |
c66ac9db NB |
2874 | break; |
2875 | case READ_ELEMENT_STATUS: | |
2876 | size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9]; | |
05d1c7c0 | 2877 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2878 | break; |
2879 | case WRITE_BUFFER: | |
2880 | size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8]; | |
05d1c7c0 | 2881 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2882 | break; |
2883 | case RESERVE: | |
2884 | case RESERVE_10: | |
2885 | /* | |
2886 | * The SPC-2 RESERVE does not contain a size in the SCSI CDB. | |
2887 | * Assume the passthrough or $FABRIC_MOD will tell us about it. | |
2888 | */ | |
2889 | if (cdb[0] == RESERVE_10) | |
2890 | size = (cdb[7] << 8) | cdb[8]; | |
2891 | else | |
2892 | size = cmd->data_length; | |
2893 | ||
2894 | /* | |
2895 | * Setup the legacy emulated handler for SPC-2 and | |
2896 | * >= SPC-3 compatible reservation handling (CRH=1) | |
2897 | * Otherwise, we assume the underlying SCSI logic is | |
2898 | * is running in SPC_PASSTHROUGH, and wants reservations | |
2899 | * emulation disabled. | |
2900 | */ | |
e76a35d6 CH |
2901 | if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH) |
2902 | cmd->execute_task = target_scsi2_reservation_reserve; | |
c66ac9db NB |
2903 | cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB; |
2904 | break; | |
2905 | case RELEASE: | |
2906 | case RELEASE_10: | |
2907 | /* | |
2908 | * The SPC-2 RELEASE does not contain a size in the SCSI CDB. | |
2909 | * Assume the passthrough or $FABRIC_MOD will tell us about it. | |
2910 | */ | |
2911 | if (cdb[0] == RELEASE_10) | |
2912 | size = (cdb[7] << 8) | cdb[8]; | |
2913 | else | |
2914 | size = cmd->data_length; | |
2915 | ||
e76a35d6 CH |
2916 | if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH) |
2917 | cmd->execute_task = target_scsi2_reservation_release; | |
c66ac9db NB |
2918 | cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB; |
2919 | break; | |
2920 | case SYNCHRONIZE_CACHE: | |
2921 | case 0x91: /* SYNCHRONIZE_CACHE_16: */ | |
2922 | /* | |
2923 | * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE | |
2924 | */ | |
2925 | if (cdb[0] == SYNCHRONIZE_CACHE) { | |
2926 | sectors = transport_get_sectors_10(cdb, cmd, §or_ret); | |
a1d8b49a | 2927 | cmd->t_task_lba = transport_lba_32(cdb); |
c66ac9db NB |
2928 | } else { |
2929 | sectors = transport_get_sectors_16(cdb, cmd, §or_ret); | |
a1d8b49a | 2930 | cmd->t_task_lba = transport_lba_64(cdb); |
c66ac9db NB |
2931 | } |
2932 | if (sector_ret) | |
2933 | goto out_unsupported_cdb; | |
2934 | ||
2935 | size = transport_get_size(sectors, cdb, cmd); | |
2936 | cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB; | |
2937 | ||
5bda90c8 | 2938 | if (passthrough) |
c66ac9db | 2939 | break; |
5bda90c8 | 2940 | |
c66ac9db NB |
2941 | /* |
2942 | * Check to ensure that LBA + Range does not exceed past end of | |
7abbe7f3 | 2943 | * device for IBLOCK and FILEIO ->do_sync_cache() backend calls |
c66ac9db | 2944 | */ |
7abbe7f3 NB |
2945 | if ((cmd->t_task_lba != 0) || (sectors != 0)) { |
2946 | if (transport_cmd_get_valid_sectors(cmd) < 0) | |
2947 | goto out_invalid_cdb_field; | |
2948 | } | |
5bda90c8 | 2949 | cmd->execute_task = target_emulate_synchronize_cache; |
c66ac9db NB |
2950 | break; |
2951 | case UNMAP: | |
2952 | size = get_unaligned_be16(&cdb[7]); | |
05d1c7c0 | 2953 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
5bda90c8 CH |
2954 | if (!passthrough) |
2955 | cmd->execute_task = target_emulate_unmap; | |
c66ac9db NB |
2956 | break; |
2957 | case WRITE_SAME_16: | |
2958 | sectors = transport_get_sectors_16(cdb, cmd, §or_ret); | |
2959 | if (sector_ret) | |
2960 | goto out_unsupported_cdb; | |
dd3a5ad8 | 2961 | |
6708bb27 | 2962 | if (sectors) |
12850626 | 2963 | size = transport_get_size(1, cdb, cmd); |
6708bb27 AG |
2964 | else { |
2965 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); | |
2966 | goto out_invalid_cdb_field; | |
2967 | } | |
dd3a5ad8 | 2968 | |
5db0753b | 2969 | cmd->t_task_lba = get_unaligned_be64(&cdb[2]); |
706d5860 NB |
2970 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
2971 | ||
2972 | if (target_check_write_same_discard(&cdb[1], dev) < 0) | |
67236c44 | 2973 | goto out_unsupported_cdb; |
5bda90c8 CH |
2974 | if (!passthrough) |
2975 | cmd->execute_task = target_emulate_write_same; | |
706d5860 NB |
2976 | break; |
2977 | case WRITE_SAME: | |
2978 | sectors = transport_get_sectors_10(cdb, cmd, §or_ret); | |
2979 | if (sector_ret) | |
2980 | goto out_unsupported_cdb; | |
2981 | ||
2982 | if (sectors) | |
12850626 | 2983 | size = transport_get_size(1, cdb, cmd); |
706d5860 NB |
2984 | else { |
2985 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); | |
2986 | goto out_invalid_cdb_field; | |
c66ac9db | 2987 | } |
706d5860 NB |
2988 | |
2989 | cmd->t_task_lba = get_unaligned_be32(&cdb[2]); | |
c66ac9db | 2990 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
706d5860 NB |
2991 | /* |
2992 | * Follow sbcr26 with WRITE_SAME (10) and check for the existence | |
2993 | * of byte 1 bit 3 UNMAP instead of original reserved field | |
2994 | */ | |
2995 | if (target_check_write_same_discard(&cdb[1], dev) < 0) | |
67236c44 | 2996 | goto out_unsupported_cdb; |
5bda90c8 CH |
2997 | if (!passthrough) |
2998 | cmd->execute_task = target_emulate_write_same; | |
c66ac9db NB |
2999 | break; |
3000 | case ALLOW_MEDIUM_REMOVAL: | |
c66ac9db | 3001 | case ERASE: |
c66ac9db NB |
3002 | case REZERO_UNIT: |
3003 | case SEEK_10: | |
c66ac9db NB |
3004 | case SPACE: |
3005 | case START_STOP: | |
3006 | case TEST_UNIT_READY: | |
3007 | case VERIFY: | |
3008 | case WRITE_FILEMARKS: | |
5bda90c8 CH |
3009 | cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB; |
3010 | if (!passthrough) | |
3011 | cmd->execute_task = target_emulate_noop; | |
3012 | break; | |
3013 | case GPCMD_CLOSE_TRACK: | |
3014 | case INITIALIZE_ELEMENT_STATUS: | |
3015 | case GPCMD_LOAD_UNLOAD: | |
3016 | case GPCMD_SET_SPEED: | |
c66ac9db NB |
3017 | case MOVE_MEDIUM: |
3018 | cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB; | |
3019 | break; | |
3020 | case REPORT_LUNS: | |
e76a35d6 | 3021 | cmd->execute_task = target_report_luns; |
c66ac9db NB |
3022 | size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; |
3023 | /* | |
3024 | * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS | |
3025 | * See spc4r17 section 5.3 | |
3026 | */ | |
5951146d | 3027 | if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) |
e66ecd50 | 3028 | cmd->sam_task_attr = MSG_HEAD_TAG; |
05d1c7c0 | 3029 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
3030 | break; |
3031 | default: | |
6708bb27 | 3032 | pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode" |
c66ac9db | 3033 | " 0x%02x, sending CHECK_CONDITION.\n", |
e3d6f909 | 3034 | cmd->se_tfo->get_fabric_name(), cdb[0]); |
c66ac9db NB |
3035 | goto out_unsupported_cdb; |
3036 | } | |
3037 | ||
3038 | if (size != cmd->data_length) { | |
6708bb27 | 3039 | pr_warn("TARGET_CORE[%s]: Expected Transfer Length:" |
c66ac9db | 3040 | " %u does not match SCSI CDB Length: %u for SAM Opcode:" |
e3d6f909 | 3041 | " 0x%02x\n", cmd->se_tfo->get_fabric_name(), |
c66ac9db NB |
3042 | cmd->data_length, size, cdb[0]); |
3043 | ||
3044 | cmd->cmd_spdtl = size; | |
3045 | ||
3046 | if (cmd->data_direction == DMA_TO_DEVICE) { | |
6708bb27 | 3047 | pr_err("Rejecting underflow/overflow" |
c66ac9db NB |
3048 | " WRITE data\n"); |
3049 | goto out_invalid_cdb_field; | |
3050 | } | |
3051 | /* | |
3052 | * Reject READ_* or WRITE_* with overflow/underflow for | |
3053 | * type SCF_SCSI_DATA_SG_IO_CDB. | |
3054 | */ | |
6708bb27 AG |
3055 | if (!ret && (dev->se_sub_dev->se_dev_attrib.block_size != 512)) { |
3056 | pr_err("Failing OVERFLOW/UNDERFLOW for LBA op" | |
c66ac9db | 3057 | " CDB on non 512-byte sector setup subsystem" |
e3d6f909 | 3058 | " plugin: %s\n", dev->transport->name); |
c66ac9db NB |
3059 | /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */ |
3060 | goto out_invalid_cdb_field; | |
3061 | } | |
3062 | ||
3063 | if (size > cmd->data_length) { | |
3064 | cmd->se_cmd_flags |= SCF_OVERFLOW_BIT; | |
3065 | cmd->residual_count = (size - cmd->data_length); | |
3066 | } else { | |
3067 | cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT; | |
3068 | cmd->residual_count = (cmd->data_length - size); | |
3069 | } | |
3070 | cmd->data_length = size; | |
3071 | } | |
3072 | ||
5bda90c8 CH |
3073 | /* reject any command that we don't have a handler for */ |
3074 | if (!(passthrough || cmd->execute_task || | |
3075 | (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB))) | |
3076 | goto out_unsupported_cdb; | |
3077 | ||
c66ac9db NB |
3078 | transport_set_supported_SAM_opcode(cmd); |
3079 | return ret; | |
3080 | ||
3081 | out_unsupported_cdb: | |
3082 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
3083 | cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; | |
5951146d | 3084 | return -EINVAL; |
c66ac9db NB |
3085 | out_invalid_cdb_field: |
3086 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
3087 | cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; | |
5951146d | 3088 | return -EINVAL; |
c66ac9db NB |
3089 | } |
3090 | ||
c66ac9db | 3091 | /* |
35e0e757 | 3092 | * Called from I/O completion to determine which dormant/delayed |
c66ac9db NB |
3093 | * and ordered cmds need to have their tasks added to the execution queue. |
3094 | */ | |
3095 | static void transport_complete_task_attr(struct se_cmd *cmd) | |
3096 | { | |
5951146d | 3097 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
3098 | struct se_cmd *cmd_p, *cmd_tmp; |
3099 | int new_active_tasks = 0; | |
3100 | ||
e66ecd50 | 3101 | if (cmd->sam_task_attr == MSG_SIMPLE_TAG) { |
c66ac9db NB |
3102 | atomic_dec(&dev->simple_cmds); |
3103 | smp_mb__after_atomic_dec(); | |
3104 | dev->dev_cur_ordered_id++; | |
6708bb27 | 3105 | pr_debug("Incremented dev->dev_cur_ordered_id: %u for" |
c66ac9db NB |
3106 | " SIMPLE: %u\n", dev->dev_cur_ordered_id, |
3107 | cmd->se_ordered_id); | |
e66ecd50 | 3108 | } else if (cmd->sam_task_attr == MSG_HEAD_TAG) { |
c66ac9db | 3109 | dev->dev_cur_ordered_id++; |
6708bb27 | 3110 | pr_debug("Incremented dev_cur_ordered_id: %u for" |
c66ac9db NB |
3111 | " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id, |
3112 | cmd->se_ordered_id); | |
e66ecd50 | 3113 | } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) { |
c66ac9db NB |
3114 | atomic_dec(&dev->dev_ordered_sync); |
3115 | smp_mb__after_atomic_dec(); | |
c66ac9db NB |
3116 | |
3117 | dev->dev_cur_ordered_id++; | |
6708bb27 | 3118 | pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:" |
c66ac9db NB |
3119 | " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id); |
3120 | } | |
3121 | /* | |
3122 | * Process all commands up to the last received | |
3123 | * ORDERED task attribute which requires another blocking | |
3124 | * boundary | |
3125 | */ | |
3126 | spin_lock(&dev->delayed_cmd_lock); | |
3127 | list_for_each_entry_safe(cmd_p, cmd_tmp, | |
5951146d | 3128 | &dev->delayed_cmd_list, se_delayed_node) { |
c66ac9db | 3129 | |
5951146d | 3130 | list_del(&cmd_p->se_delayed_node); |
c66ac9db NB |
3131 | spin_unlock(&dev->delayed_cmd_lock); |
3132 | ||
6708bb27 | 3133 | pr_debug("Calling add_tasks() for" |
c66ac9db NB |
3134 | " cmd_p: 0x%02x Task Attr: 0x%02x" |
3135 | " Dormant -> Active, se_ordered_id: %u\n", | |
6708bb27 | 3136 | cmd_p->t_task_cdb[0], |
c66ac9db NB |
3137 | cmd_p->sam_task_attr, cmd_p->se_ordered_id); |
3138 | ||
3139 | transport_add_tasks_from_cmd(cmd_p); | |
3140 | new_active_tasks++; | |
3141 | ||
3142 | spin_lock(&dev->delayed_cmd_lock); | |
e66ecd50 | 3143 | if (cmd_p->sam_task_attr == MSG_ORDERED_TAG) |
c66ac9db NB |
3144 | break; |
3145 | } | |
3146 | spin_unlock(&dev->delayed_cmd_lock); | |
3147 | /* | |
3148 | * If new tasks have become active, wake up the transport thread | |
3149 | * to do the processing of the Active tasks. | |
3150 | */ | |
3151 | if (new_active_tasks != 0) | |
e3d6f909 | 3152 | wake_up_interruptible(&dev->dev_queue_obj.thread_wq); |
c66ac9db NB |
3153 | } |
3154 | ||
e057f533 | 3155 | static void transport_complete_qf(struct se_cmd *cmd) |
07bde79a NB |
3156 | { |
3157 | int ret = 0; | |
3158 | ||
e057f533 CH |
3159 | if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) |
3160 | transport_complete_task_attr(cmd); | |
3161 | ||
3162 | if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) { | |
3163 | ret = cmd->se_tfo->queue_status(cmd); | |
3164 | if (ret) | |
3165 | goto out; | |
3166 | } | |
07bde79a NB |
3167 | |
3168 | switch (cmd->data_direction) { | |
3169 | case DMA_FROM_DEVICE: | |
3170 | ret = cmd->se_tfo->queue_data_in(cmd); | |
3171 | break; | |
3172 | case DMA_TO_DEVICE: | |
ec98f782 | 3173 | if (cmd->t_bidi_data_sg) { |
07bde79a NB |
3174 | ret = cmd->se_tfo->queue_data_in(cmd); |
3175 | if (ret < 0) | |
e057f533 | 3176 | break; |
07bde79a NB |
3177 | } |
3178 | /* Fall through for DMA_TO_DEVICE */ | |
3179 | case DMA_NONE: | |
3180 | ret = cmd->se_tfo->queue_status(cmd); | |
3181 | break; | |
3182 | default: | |
3183 | break; | |
3184 | } | |
3185 | ||
e057f533 CH |
3186 | out: |
3187 | if (ret < 0) { | |
3188 | transport_handle_queue_full(cmd, cmd->se_dev); | |
3189 | return; | |
3190 | } | |
3191 | transport_lun_remove_cmd(cmd); | |
3192 | transport_cmd_check_stop_to_fabric(cmd); | |
07bde79a NB |
3193 | } |
3194 | ||
3195 | static void transport_handle_queue_full( | |
3196 | struct se_cmd *cmd, | |
e057f533 | 3197 | struct se_device *dev) |
07bde79a NB |
3198 | { |
3199 | spin_lock_irq(&dev->qf_cmd_lock); | |
07bde79a NB |
3200 | list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list); |
3201 | atomic_inc(&dev->dev_qf_count); | |
3202 | smp_mb__after_atomic_inc(); | |
3203 | spin_unlock_irq(&cmd->se_dev->qf_cmd_lock); | |
3204 | ||
3205 | schedule_work(&cmd->se_dev->qf_work_queue); | |
3206 | } | |
3207 | ||
35e0e757 | 3208 | static void target_complete_ok_work(struct work_struct *work) |
c66ac9db | 3209 | { |
35e0e757 | 3210 | struct se_cmd *cmd = container_of(work, struct se_cmd, work); |
07bde79a | 3211 | int reason = 0, ret; |
35e0e757 | 3212 | |
c66ac9db NB |
3213 | /* |
3214 | * Check if we need to move delayed/dormant tasks from cmds on the | |
3215 | * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task | |
3216 | * Attribute. | |
3217 | */ | |
5951146d | 3218 | if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) |
c66ac9db | 3219 | transport_complete_task_attr(cmd); |
07bde79a NB |
3220 | /* |
3221 | * Check to schedule QUEUE_FULL work, or execute an existing | |
3222 | * cmd->transport_qf_callback() | |
3223 | */ | |
3224 | if (atomic_read(&cmd->se_dev->dev_qf_count) != 0) | |
3225 | schedule_work(&cmd->se_dev->qf_work_queue); | |
3226 | ||
c66ac9db NB |
3227 | /* |
3228 | * Check if we need to retrieve a sense buffer from | |
3229 | * the struct se_cmd in question. | |
3230 | */ | |
3231 | if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) { | |
3232 | if (transport_get_sense_data(cmd) < 0) | |
3233 | reason = TCM_NON_EXISTENT_LUN; | |
3234 | ||
3235 | /* | |
3236 | * Only set when an struct se_task->task_scsi_status returned | |
3237 | * a non GOOD status. | |
3238 | */ | |
3239 | if (cmd->scsi_status) { | |
07bde79a | 3240 | ret = transport_send_check_condition_and_sense( |
c66ac9db | 3241 | cmd, reason, 1); |
f147abb4 | 3242 | if (ret == -EAGAIN || ret == -ENOMEM) |
07bde79a NB |
3243 | goto queue_full; |
3244 | ||
c66ac9db NB |
3245 | transport_lun_remove_cmd(cmd); |
3246 | transport_cmd_check_stop_to_fabric(cmd); | |
3247 | return; | |
3248 | } | |
3249 | } | |
3250 | /* | |
25985edc | 3251 | * Check for a callback, used by amongst other things |
c66ac9db NB |
3252 | * XDWRITE_READ_10 emulation. |
3253 | */ | |
3254 | if (cmd->transport_complete_callback) | |
3255 | cmd->transport_complete_callback(cmd); | |
3256 | ||
3257 | switch (cmd->data_direction) { | |
3258 | case DMA_FROM_DEVICE: | |
3259 | spin_lock(&cmd->se_lun->lun_sep_lock); | |
e3d6f909 AG |
3260 | if (cmd->se_lun->lun_sep) { |
3261 | cmd->se_lun->lun_sep->sep_stats.tx_data_octets += | |
c66ac9db NB |
3262 | cmd->data_length; |
3263 | } | |
3264 | spin_unlock(&cmd->se_lun->lun_sep_lock); | |
c66ac9db | 3265 | |
07bde79a | 3266 | ret = cmd->se_tfo->queue_data_in(cmd); |
f147abb4 | 3267 | if (ret == -EAGAIN || ret == -ENOMEM) |
07bde79a | 3268 | goto queue_full; |
c66ac9db NB |
3269 | break; |
3270 | case DMA_TO_DEVICE: | |
3271 | spin_lock(&cmd->se_lun->lun_sep_lock); | |
e3d6f909 AG |
3272 | if (cmd->se_lun->lun_sep) { |
3273 | cmd->se_lun->lun_sep->sep_stats.rx_data_octets += | |
c66ac9db NB |
3274 | cmd->data_length; |
3275 | } | |
3276 | spin_unlock(&cmd->se_lun->lun_sep_lock); | |
3277 | /* | |
3278 | * Check if we need to send READ payload for BIDI-COMMAND | |
3279 | */ | |
ec98f782 | 3280 | if (cmd->t_bidi_data_sg) { |
c66ac9db | 3281 | spin_lock(&cmd->se_lun->lun_sep_lock); |
e3d6f909 AG |
3282 | if (cmd->se_lun->lun_sep) { |
3283 | cmd->se_lun->lun_sep->sep_stats.tx_data_octets += | |
c66ac9db NB |
3284 | cmd->data_length; |
3285 | } | |
3286 | spin_unlock(&cmd->se_lun->lun_sep_lock); | |
07bde79a | 3287 | ret = cmd->se_tfo->queue_data_in(cmd); |
f147abb4 | 3288 | if (ret == -EAGAIN || ret == -ENOMEM) |
07bde79a | 3289 | goto queue_full; |
c66ac9db NB |
3290 | break; |
3291 | } | |
3292 | /* Fall through for DMA_TO_DEVICE */ | |
3293 | case DMA_NONE: | |
07bde79a | 3294 | ret = cmd->se_tfo->queue_status(cmd); |
f147abb4 | 3295 | if (ret == -EAGAIN || ret == -ENOMEM) |
07bde79a | 3296 | goto queue_full; |
c66ac9db NB |
3297 | break; |
3298 | default: | |
3299 | break; | |
3300 | } | |
3301 | ||
3302 | transport_lun_remove_cmd(cmd); | |
3303 | transport_cmd_check_stop_to_fabric(cmd); | |
07bde79a NB |
3304 | return; |
3305 | ||
3306 | queue_full: | |
6708bb27 | 3307 | pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p," |
07bde79a | 3308 | " data_direction: %d\n", cmd, cmd->data_direction); |
e057f533 CH |
3309 | cmd->t_state = TRANSPORT_COMPLETE_QF_OK; |
3310 | transport_handle_queue_full(cmd, cmd->se_dev); | |
c66ac9db NB |
3311 | } |
3312 | ||
3313 | static void transport_free_dev_tasks(struct se_cmd *cmd) | |
3314 | { | |
3315 | struct se_task *task, *task_tmp; | |
3316 | unsigned long flags; | |
0c2cfe5f | 3317 | LIST_HEAD(dispose_list); |
c66ac9db | 3318 | |
a1d8b49a | 3319 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 3320 | list_for_each_entry_safe(task, task_tmp, |
a1d8b49a | 3321 | &cmd->t_task_list, t_list) { |
0c2cfe5f CH |
3322 | if (!(task->task_flags & TF_ACTIVE)) |
3323 | list_move_tail(&task->t_list, &dispose_list); | |
3324 | } | |
3325 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
3326 | ||
3327 | while (!list_empty(&dispose_list)) { | |
3328 | task = list_first_entry(&dispose_list, struct se_task, t_list); | |
c66ac9db | 3329 | |
af3f00c7 CH |
3330 | if (task->task_sg != cmd->t_data_sg && |
3331 | task->task_sg != cmd->t_bidi_data_sg) | |
3332 | kfree(task->task_sg); | |
c66ac9db NB |
3333 | |
3334 | list_del(&task->t_list); | |
3335 | ||
42bf829e | 3336 | cmd->se_dev->transport->free_task(task); |
c66ac9db | 3337 | } |
c66ac9db NB |
3338 | } |
3339 | ||
6708bb27 | 3340 | static inline void transport_free_sgl(struct scatterlist *sgl, int nents) |
c66ac9db | 3341 | { |
ec98f782 | 3342 | struct scatterlist *sg; |
ec98f782 | 3343 | int count; |
c66ac9db | 3344 | |
6708bb27 AG |
3345 | for_each_sg(sgl, sg, nents, count) |
3346 | __free_page(sg_page(sg)); | |
c66ac9db | 3347 | |
6708bb27 AG |
3348 | kfree(sgl); |
3349 | } | |
c66ac9db | 3350 | |
6708bb27 AG |
3351 | static inline void transport_free_pages(struct se_cmd *cmd) |
3352 | { | |
3353 | if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) | |
3354 | return; | |
3355 | ||
3356 | transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents); | |
ec98f782 AG |
3357 | cmd->t_data_sg = NULL; |
3358 | cmd->t_data_nents = 0; | |
c66ac9db | 3359 | |
6708bb27 | 3360 | transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents); |
ec98f782 AG |
3361 | cmd->t_bidi_data_sg = NULL; |
3362 | cmd->t_bidi_data_nents = 0; | |
c66ac9db NB |
3363 | } |
3364 | ||
e26d99ae CH |
3365 | /** |
3366 | * transport_release_cmd - free a command | |
3367 | * @cmd: command to free | |
3368 | * | |
3369 | * This routine unconditionally frees a command, and reference counting | |
3370 | * or list removal must be done in the caller. | |
3371 | */ | |
3372 | static void transport_release_cmd(struct se_cmd *cmd) | |
3373 | { | |
3374 | BUG_ON(!cmd->se_tfo); | |
3375 | ||
3376 | if (cmd->se_tmr_req) | |
3377 | core_tmr_release_req(cmd->se_tmr_req); | |
3378 | if (cmd->t_task_cdb != cmd->__t_task_cdb) | |
3379 | kfree(cmd->t_task_cdb); | |
3380 | /* | |
7481deb4 NB |
3381 | * If this cmd has been setup with target_get_sess_cmd(), drop |
3382 | * the kref and call ->release_cmd() in kref callback. | |
e26d99ae | 3383 | */ |
7481deb4 NB |
3384 | if (cmd->check_release != 0) { |
3385 | target_put_sess_cmd(cmd->se_sess, cmd); | |
3386 | return; | |
3387 | } | |
e26d99ae CH |
3388 | cmd->se_tfo->release_cmd(cmd); |
3389 | } | |
3390 | ||
d3df7825 CH |
3391 | /** |
3392 | * transport_put_cmd - release a reference to a command | |
3393 | * @cmd: command to release | |
3394 | * | |
3395 | * This routine releases our reference to the command and frees it if possible. | |
3396 | */ | |
39c05f32 | 3397 | static void transport_put_cmd(struct se_cmd *cmd) |
c66ac9db NB |
3398 | { |
3399 | unsigned long flags; | |
4911e3cc | 3400 | int free_tasks = 0; |
c66ac9db | 3401 | |
a1d8b49a | 3402 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
4911e3cc CH |
3403 | if (atomic_read(&cmd->t_fe_count)) { |
3404 | if (!atomic_dec_and_test(&cmd->t_fe_count)) | |
3405 | goto out_busy; | |
3406 | } | |
3407 | ||
3408 | if (atomic_read(&cmd->t_se_count)) { | |
3409 | if (!atomic_dec_and_test(&cmd->t_se_count)) | |
3410 | goto out_busy; | |
3411 | } | |
3412 | ||
7d680f3b CH |
3413 | if (cmd->transport_state & CMD_T_DEV_ACTIVE) { |
3414 | cmd->transport_state &= ~CMD_T_DEV_ACTIVE; | |
4911e3cc CH |
3415 | transport_all_task_dev_remove_state(cmd); |
3416 | free_tasks = 1; | |
c66ac9db | 3417 | } |
a1d8b49a | 3418 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 3419 | |
4911e3cc CH |
3420 | if (free_tasks != 0) |
3421 | transport_free_dev_tasks(cmd); | |
d3df7825 | 3422 | |
c66ac9db | 3423 | transport_free_pages(cmd); |
31afc39c | 3424 | transport_release_cmd(cmd); |
39c05f32 | 3425 | return; |
4911e3cc CH |
3426 | out_busy: |
3427 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
c66ac9db NB |
3428 | } |
3429 | ||
c66ac9db | 3430 | /* |
ec98f782 AG |
3431 | * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of |
3432 | * allocating in the core. | |
c66ac9db NB |
3433 | * @cmd: Associated se_cmd descriptor |
3434 | * @mem: SGL style memory for TCM WRITE / READ | |
3435 | * @sg_mem_num: Number of SGL elements | |
3436 | * @mem_bidi_in: SGL style memory for TCM BIDI READ | |
3437 | * @sg_mem_bidi_num: Number of BIDI READ SGL elements | |
3438 | * | |
3439 | * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage | |
3440 | * of parameters. | |
3441 | */ | |
3442 | int transport_generic_map_mem_to_cmd( | |
3443 | struct se_cmd *cmd, | |
5951146d AG |
3444 | struct scatterlist *sgl, |
3445 | u32 sgl_count, | |
3446 | struct scatterlist *sgl_bidi, | |
3447 | u32 sgl_bidi_count) | |
c66ac9db | 3448 | { |
5951146d | 3449 | if (!sgl || !sgl_count) |
c66ac9db | 3450 | return 0; |
c66ac9db | 3451 | |
c66ac9db NB |
3452 | if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) || |
3453 | (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) { | |
fef58a60 NB |
3454 | /* |
3455 | * Reject SCSI data overflow with map_mem_to_cmd() as incoming | |
3456 | * scatterlists already have been set to follow what the fabric | |
3457 | * passes for the original expected data transfer length. | |
3458 | */ | |
3459 | if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) { | |
3460 | pr_warn("Rejecting SCSI DATA overflow for fabric using" | |
3461 | " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n"); | |
3462 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
3463 | cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; | |
3464 | return -EINVAL; | |
3465 | } | |
c66ac9db | 3466 | |
ec98f782 AG |
3467 | cmd->t_data_sg = sgl; |
3468 | cmd->t_data_nents = sgl_count; | |
c66ac9db | 3469 | |
ec98f782 AG |
3470 | if (sgl_bidi && sgl_bidi_count) { |
3471 | cmd->t_bidi_data_sg = sgl_bidi; | |
3472 | cmd->t_bidi_data_nents = sgl_bidi_count; | |
c66ac9db NB |
3473 | } |
3474 | cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC; | |
c66ac9db NB |
3475 | } |
3476 | ||
3477 | return 0; | |
3478 | } | |
3479 | EXPORT_SYMBOL(transport_generic_map_mem_to_cmd); | |
3480 | ||
4949314c | 3481 | void *transport_kmap_data_sg(struct se_cmd *cmd) |
05d1c7c0 | 3482 | { |
ec98f782 | 3483 | struct scatterlist *sg = cmd->t_data_sg; |
4949314c AG |
3484 | struct page **pages; |
3485 | int i; | |
05d1c7c0 | 3486 | |
ec98f782 | 3487 | BUG_ON(!sg); |
05d1c7c0 | 3488 | /* |
ec98f782 AG |
3489 | * We need to take into account a possible offset here for fabrics like |
3490 | * tcm_loop who may be using a contig buffer from the SCSI midlayer for | |
3491 | * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd() | |
05d1c7c0 | 3492 | */ |
4949314c AG |
3493 | if (!cmd->t_data_nents) |
3494 | return NULL; | |
3495 | else if (cmd->t_data_nents == 1) | |
3496 | return kmap(sg_page(sg)) + sg->offset; | |
3497 | ||
3498 | /* >1 page. use vmap */ | |
3499 | pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL); | |
3500 | if (!pages) | |
3501 | return NULL; | |
3502 | ||
3503 | /* convert sg[] to pages[] */ | |
3504 | for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) { | |
3505 | pages[i] = sg_page(sg); | |
3506 | } | |
3507 | ||
3508 | cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL); | |
3509 | kfree(pages); | |
3510 | if (!cmd->t_data_vmap) | |
3511 | return NULL; | |
3512 | ||
3513 | return cmd->t_data_vmap + cmd->t_data_sg[0].offset; | |
05d1c7c0 | 3514 | } |
4949314c | 3515 | EXPORT_SYMBOL(transport_kmap_data_sg); |
05d1c7c0 | 3516 | |
4949314c | 3517 | void transport_kunmap_data_sg(struct se_cmd *cmd) |
05d1c7c0 | 3518 | { |
4949314c AG |
3519 | if (!cmd->t_data_nents) |
3520 | return; | |
3521 | else if (cmd->t_data_nents == 1) | |
3522 | kunmap(sg_page(cmd->t_data_sg)); | |
3523 | ||
3524 | vunmap(cmd->t_data_vmap); | |
3525 | cmd->t_data_vmap = NULL; | |
05d1c7c0 | 3526 | } |
4949314c | 3527 | EXPORT_SYMBOL(transport_kunmap_data_sg); |
05d1c7c0 | 3528 | |
c66ac9db | 3529 | static int |
05d1c7c0 | 3530 | transport_generic_get_mem(struct se_cmd *cmd) |
c66ac9db | 3531 | { |
ec98f782 AG |
3532 | u32 length = cmd->data_length; |
3533 | unsigned int nents; | |
3534 | struct page *page; | |
9db9da33 | 3535 | gfp_t zero_flag; |
ec98f782 | 3536 | int i = 0; |
c66ac9db | 3537 | |
ec98f782 AG |
3538 | nents = DIV_ROUND_UP(length, PAGE_SIZE); |
3539 | cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL); | |
3540 | if (!cmd->t_data_sg) | |
3541 | return -ENOMEM; | |
c66ac9db | 3542 | |
ec98f782 AG |
3543 | cmd->t_data_nents = nents; |
3544 | sg_init_table(cmd->t_data_sg, nents); | |
c66ac9db | 3545 | |
9db9da33 | 3546 | zero_flag = cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB ? 0 : __GFP_ZERO; |
3547 | ||
ec98f782 AG |
3548 | while (length) { |
3549 | u32 page_len = min_t(u32, length, PAGE_SIZE); | |
9db9da33 | 3550 | page = alloc_page(GFP_KERNEL | zero_flag); |
ec98f782 AG |
3551 | if (!page) |
3552 | goto out; | |
c66ac9db | 3553 | |
ec98f782 AG |
3554 | sg_set_page(&cmd->t_data_sg[i], page, page_len, 0); |
3555 | length -= page_len; | |
3556 | i++; | |
c66ac9db | 3557 | } |
c66ac9db | 3558 | return 0; |
c66ac9db | 3559 | |
ec98f782 AG |
3560 | out: |
3561 | while (i >= 0) { | |
3562 | __free_page(sg_page(&cmd->t_data_sg[i])); | |
3563 | i--; | |
c66ac9db | 3564 | } |
ec98f782 AG |
3565 | kfree(cmd->t_data_sg); |
3566 | cmd->t_data_sg = NULL; | |
3567 | return -ENOMEM; | |
c66ac9db NB |
3568 | } |
3569 | ||
a1d8b49a AG |
3570 | /* Reduce sectors if they are too long for the device */ |
3571 | static inline sector_t transport_limit_task_sectors( | |
c66ac9db NB |
3572 | struct se_device *dev, |
3573 | unsigned long long lba, | |
a1d8b49a | 3574 | sector_t sectors) |
c66ac9db | 3575 | { |
a1d8b49a | 3576 | sectors = min_t(sector_t, sectors, dev->se_sub_dev->se_dev_attrib.max_sectors); |
c66ac9db | 3577 | |
a1d8b49a AG |
3578 | if (dev->transport->get_device_type(dev) == TYPE_DISK) |
3579 | if ((lba + sectors) > transport_dev_end_lba(dev)) | |
3580 | sectors = ((transport_dev_end_lba(dev) - lba) + 1); | |
c66ac9db | 3581 | |
a1d8b49a | 3582 | return sectors; |
c66ac9db NB |
3583 | } |
3584 | ||
c66ac9db NB |
3585 | |
3586 | /* | |
3587 | * This function can be used by HW target mode drivers to create a linked | |
3588 | * scatterlist from all contiguously allocated struct se_task->task_sg[]. | |
3589 | * This is intended to be called during the completion path by TCM Core | |
3590 | * when struct target_core_fabric_ops->check_task_sg_chaining is enabled. | |
3591 | */ | |
3592 | void transport_do_task_sg_chain(struct se_cmd *cmd) | |
3593 | { | |
ec98f782 AG |
3594 | struct scatterlist *sg_first = NULL; |
3595 | struct scatterlist *sg_prev = NULL; | |
3596 | int sg_prev_nents = 0; | |
3597 | struct scatterlist *sg; | |
c66ac9db | 3598 | struct se_task *task; |
ec98f782 | 3599 | u32 chained_nents = 0; |
c66ac9db NB |
3600 | int i; |
3601 | ||
ec98f782 AG |
3602 | BUG_ON(!cmd->se_tfo->task_sg_chaining); |
3603 | ||
c66ac9db NB |
3604 | /* |
3605 | * Walk the struct se_task list and setup scatterlist chains | |
a1d8b49a | 3606 | * for each contiguously allocated struct se_task->task_sg[]. |
c66ac9db | 3607 | */ |
a1d8b49a | 3608 | list_for_each_entry(task, &cmd->t_task_list, t_list) { |
ec98f782 | 3609 | if (!task->task_sg) |
c66ac9db NB |
3610 | continue; |
3611 | ||
ec98f782 AG |
3612 | if (!sg_first) { |
3613 | sg_first = task->task_sg; | |
6708bb27 | 3614 | chained_nents = task->task_sg_nents; |
97868c89 | 3615 | } else { |
ec98f782 | 3616 | sg_chain(sg_prev, sg_prev_nents, task->task_sg); |
6708bb27 | 3617 | chained_nents += task->task_sg_nents; |
97868c89 | 3618 | } |
c3c74c7a NB |
3619 | /* |
3620 | * For the padded tasks, use the extra SGL vector allocated | |
3621 | * in transport_allocate_data_tasks() for the sg_prev_nents | |
04629b7b CH |
3622 | * offset into sg_chain() above. |
3623 | * | |
3624 | * We do not need the padding for the last task (or a single | |
3625 | * task), but in that case we will never use the sg_prev_nents | |
3626 | * value below which would be incorrect. | |
c3c74c7a | 3627 | */ |
04629b7b | 3628 | sg_prev_nents = (task->task_sg_nents + 1); |
ec98f782 | 3629 | sg_prev = task->task_sg; |
c66ac9db NB |
3630 | } |
3631 | /* | |
3632 | * Setup the starting pointer and total t_tasks_sg_linked_no including | |
3633 | * padding SGs for linking and to mark the end. | |
3634 | */ | |
a1d8b49a | 3635 | cmd->t_tasks_sg_chained = sg_first; |
ec98f782 | 3636 | cmd->t_tasks_sg_chained_no = chained_nents; |
c66ac9db | 3637 | |
6708bb27 | 3638 | pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and" |
a1d8b49a AG |
3639 | " t_tasks_sg_chained_no: %u\n", cmd, cmd->t_tasks_sg_chained, |
3640 | cmd->t_tasks_sg_chained_no); | |
c66ac9db | 3641 | |
a1d8b49a AG |
3642 | for_each_sg(cmd->t_tasks_sg_chained, sg, |
3643 | cmd->t_tasks_sg_chained_no, i) { | |
c66ac9db | 3644 | |
6708bb27 | 3645 | pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n", |
5951146d | 3646 | i, sg, sg_page(sg), sg->length, sg->offset); |
c66ac9db | 3647 | if (sg_is_chain(sg)) |
6708bb27 | 3648 | pr_debug("SG: %p sg_is_chain=1\n", sg); |
c66ac9db | 3649 | if (sg_is_last(sg)) |
6708bb27 | 3650 | pr_debug("SG: %p sg_is_last=1\n", sg); |
c66ac9db | 3651 | } |
c66ac9db NB |
3652 | } |
3653 | EXPORT_SYMBOL(transport_do_task_sg_chain); | |
3654 | ||
a1d8b49a AG |
3655 | /* |
3656 | * Break up cmd into chunks transport can handle | |
3657 | */ | |
38b40067 CH |
3658 | static int |
3659 | transport_allocate_data_tasks(struct se_cmd *cmd, | |
c66ac9db | 3660 | enum dma_data_direction data_direction, |
38b40067 | 3661 | struct scatterlist *cmd_sg, unsigned int sgl_nents) |
c66ac9db | 3662 | { |
5951146d | 3663 | struct se_device *dev = cmd->se_dev; |
a3eedc22 | 3664 | int task_count, i; |
38b40067 CH |
3665 | unsigned long long lba; |
3666 | sector_t sectors, dev_max_sectors; | |
3667 | u32 sector_size; | |
3668 | ||
3669 | if (transport_cmd_get_valid_sectors(cmd) < 0) | |
3670 | return -EINVAL; | |
3671 | ||
3672 | dev_max_sectors = dev->se_sub_dev->se_dev_attrib.max_sectors; | |
3673 | sector_size = dev->se_sub_dev->se_dev_attrib.block_size; | |
a1d8b49a | 3674 | |
ec98f782 | 3675 | WARN_ON(cmd->data_length % sector_size); |
38b40067 CH |
3676 | |
3677 | lba = cmd->t_task_lba; | |
ec98f782 | 3678 | sectors = DIV_ROUND_UP(cmd->data_length, sector_size); |
277c5f27 | 3679 | task_count = DIV_ROUND_UP_SECTOR_T(sectors, dev_max_sectors); |
af3f00c7 CH |
3680 | |
3681 | /* | |
3682 | * If we need just a single task reuse the SG list in the command | |
3683 | * and avoid a lot of work. | |
3684 | */ | |
3685 | if (task_count == 1) { | |
3686 | struct se_task *task; | |
3687 | unsigned long flags; | |
3688 | ||
3689 | task = transport_generic_get_task(cmd, data_direction); | |
3690 | if (!task) | |
3691 | return -ENOMEM; | |
3692 | ||
3693 | task->task_sg = cmd_sg; | |
3694 | task->task_sg_nents = sgl_nents; | |
3695 | ||
3696 | task->task_lba = lba; | |
3697 | task->task_sectors = sectors; | |
3698 | task->task_size = task->task_sectors * sector_size; | |
3699 | ||
3700 | spin_lock_irqsave(&cmd->t_state_lock, flags); | |
3701 | list_add_tail(&task->t_list, &cmd->t_task_list); | |
3702 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
3703 | ||
3704 | return task_count; | |
3705 | } | |
3706 | ||
ec98f782 | 3707 | for (i = 0; i < task_count; i++) { |
38b40067 | 3708 | struct se_task *task; |
c3c74c7a | 3709 | unsigned int task_size, task_sg_nents_padded; |
38b40067 CH |
3710 | struct scatterlist *sg; |
3711 | unsigned long flags; | |
ec98f782 | 3712 | int count; |
a1d8b49a | 3713 | |
c66ac9db | 3714 | task = transport_generic_get_task(cmd, data_direction); |
a1d8b49a | 3715 | if (!task) |
ec98f782 | 3716 | return -ENOMEM; |
c66ac9db | 3717 | |
c66ac9db | 3718 | task->task_lba = lba; |
ec98f782 AG |
3719 | task->task_sectors = min(sectors, dev_max_sectors); |
3720 | task->task_size = task->task_sectors * sector_size; | |
c66ac9db | 3721 | |
525a48a2 NB |
3722 | /* |
3723 | * This now assumes that passed sg_ents are in PAGE_SIZE chunks | |
3724 | * in order to calculate the number per task SGL entries | |
3725 | */ | |
3726 | task->task_sg_nents = DIV_ROUND_UP(task->task_size, PAGE_SIZE); | |
c66ac9db | 3727 | /* |
ec98f782 AG |
3728 | * Check if the fabric module driver is requesting that all |
3729 | * struct se_task->task_sg[] be chained together.. If so, | |
3730 | * then allocate an extra padding SG entry for linking and | |
c3c74c7a NB |
3731 | * marking the end of the chained SGL for every task except |
3732 | * the last one for (task_count > 1) operation, or skipping | |
3733 | * the extra padding for the (task_count == 1) case. | |
c66ac9db | 3734 | */ |
c3c74c7a NB |
3735 | if (cmd->se_tfo->task_sg_chaining && (i < (task_count - 1))) { |
3736 | task_sg_nents_padded = (task->task_sg_nents + 1); | |
c3c74c7a NB |
3737 | } else |
3738 | task_sg_nents_padded = task->task_sg_nents; | |
c66ac9db | 3739 | |
1d20bb61 | 3740 | task->task_sg = kmalloc(sizeof(struct scatterlist) * |
c3c74c7a | 3741 | task_sg_nents_padded, GFP_KERNEL); |
ec98f782 AG |
3742 | if (!task->task_sg) { |
3743 | cmd->se_dev->transport->free_task(task); | |
3744 | return -ENOMEM; | |
3745 | } | |
3746 | ||
c3c74c7a | 3747 | sg_init_table(task->task_sg, task_sg_nents_padded); |
c66ac9db | 3748 | |
ec98f782 AG |
3749 | task_size = task->task_size; |
3750 | ||
3751 | /* Build new sgl, only up to task_size */ | |
6708bb27 | 3752 | for_each_sg(task->task_sg, sg, task->task_sg_nents, count) { |
ec98f782 AG |
3753 | if (cmd_sg->length > task_size) |
3754 | break; | |
3755 | ||
3756 | *sg = *cmd_sg; | |
3757 | task_size -= cmd_sg->length; | |
3758 | cmd_sg = sg_next(cmd_sg); | |
c66ac9db | 3759 | } |
c66ac9db | 3760 | |
ec98f782 AG |
3761 | lba += task->task_sectors; |
3762 | sectors -= task->task_sectors; | |
c66ac9db | 3763 | |
ec98f782 AG |
3764 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
3765 | list_add_tail(&task->t_list, &cmd->t_task_list); | |
3766 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
c66ac9db NB |
3767 | } |
3768 | ||
ec98f782 | 3769 | return task_count; |
c66ac9db NB |
3770 | } |
3771 | ||
3772 | static int | |
ec98f782 | 3773 | transport_allocate_control_task(struct se_cmd *cmd) |
c66ac9db | 3774 | { |
c66ac9db | 3775 | struct se_task *task; |
ec98f782 | 3776 | unsigned long flags; |
c66ac9db | 3777 | |
91ec1d35 NB |
3778 | /* Workaround for handling zero-length control CDBs */ |
3779 | if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) && | |
3780 | !cmd->data_length) | |
3781 | return 0; | |
3782 | ||
c66ac9db NB |
3783 | task = transport_generic_get_task(cmd, cmd->data_direction); |
3784 | if (!task) | |
ec98f782 | 3785 | return -ENOMEM; |
c66ac9db | 3786 | |
af3f00c7 | 3787 | task->task_sg = cmd->t_data_sg; |
c66ac9db | 3788 | task->task_size = cmd->data_length; |
6708bb27 | 3789 | task->task_sg_nents = cmd->t_data_nents; |
c66ac9db | 3790 | |
ec98f782 AG |
3791 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
3792 | list_add_tail(&task->t_list, &cmd->t_task_list); | |
3793 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
c66ac9db | 3794 | |
6708bb27 | 3795 | /* Success! Return number of tasks allocated */ |
a3eedc22 | 3796 | return 1; |
ec98f782 AG |
3797 | } |
3798 | ||
da0f7619 CH |
3799 | /* |
3800 | * Allocate any required ressources to execute the command, and either place | |
3801 | * it on the execution queue if possible. For writes we might not have the | |
3802 | * payload yet, thus notify the fabric via a call to ->write_pending instead. | |
c66ac9db | 3803 | */ |
a1d8b49a | 3804 | int transport_generic_new_cmd(struct se_cmd *cmd) |
c66ac9db | 3805 | { |
da0f7619 | 3806 | struct se_device *dev = cmd->se_dev; |
9ac54987 | 3807 | int task_cdbs, task_cdbs_bidi = 0; |
da0f7619 | 3808 | int set_counts = 1; |
c66ac9db NB |
3809 | int ret = 0; |
3810 | ||
3811 | /* | |
3812 | * Determine is the TCM fabric module has already allocated physical | |
3813 | * memory, and is directly calling transport_generic_map_mem_to_cmd() | |
ec98f782 | 3814 | * beforehand. |
c66ac9db | 3815 | */ |
ec98f782 AG |
3816 | if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) && |
3817 | cmd->data_length) { | |
05d1c7c0 | 3818 | ret = transport_generic_get_mem(cmd); |
c66ac9db | 3819 | if (ret < 0) |
03e98c9e | 3820 | goto out_fail; |
c66ac9db | 3821 | } |
da0f7619 | 3822 | |
1d20bb61 | 3823 | /* |
38b40067 | 3824 | * For BIDI command set up the read tasks first. |
1d20bb61 | 3825 | */ |
da0f7619 | 3826 | if (cmd->t_bidi_data_sg && |
38b40067 CH |
3827 | dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) { |
3828 | BUG_ON(!(cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)); | |
3829 | ||
9ac54987 NB |
3830 | task_cdbs_bidi = transport_allocate_data_tasks(cmd, |
3831 | DMA_FROM_DEVICE, cmd->t_bidi_data_sg, | |
3832 | cmd->t_bidi_data_nents); | |
3833 | if (task_cdbs_bidi <= 0) | |
da0f7619 CH |
3834 | goto out_fail; |
3835 | ||
3836 | atomic_inc(&cmd->t_fe_count); | |
3837 | atomic_inc(&cmd->t_se_count); | |
3838 | set_counts = 0; | |
3839 | } | |
38b40067 CH |
3840 | |
3841 | if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) { | |
3842 | task_cdbs = transport_allocate_data_tasks(cmd, | |
3843 | cmd->data_direction, cmd->t_data_sg, | |
3844 | cmd->t_data_nents); | |
3845 | } else { | |
3846 | task_cdbs = transport_allocate_control_task(cmd); | |
3847 | } | |
3848 | ||
410f6702 | 3849 | if (task_cdbs < 0) |
da0f7619 | 3850 | goto out_fail; |
410f6702 | 3851 | else if (!task_cdbs && (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)) { |
7d680f3b | 3852 | spin_lock_irq(&cmd->t_state_lock); |
410f6702 | 3853 | cmd->t_state = TRANSPORT_COMPLETE; |
7d680f3b CH |
3854 | cmd->transport_state |= CMD_T_ACTIVE; |
3855 | spin_unlock_irq(&cmd->t_state_lock); | |
91ec1d35 NB |
3856 | |
3857 | if (cmd->t_task_cdb[0] == REQUEST_SENSE) { | |
3858 | u8 ua_asc = 0, ua_ascq = 0; | |
3859 | ||
3860 | core_scsi3_ua_clear_for_request_sense(cmd, | |
3861 | &ua_asc, &ua_ascq); | |
3862 | } | |
3863 | ||
410f6702 RD |
3864 | INIT_WORK(&cmd->work, target_complete_ok_work); |
3865 | queue_work(target_completion_wq, &cmd->work); | |
3866 | return 0; | |
3867 | } | |
da0f7619 CH |
3868 | |
3869 | if (set_counts) { | |
3870 | atomic_inc(&cmd->t_fe_count); | |
3871 | atomic_inc(&cmd->t_se_count); | |
3872 | } | |
3873 | ||
9ac54987 NB |
3874 | cmd->t_task_list_num = (task_cdbs + task_cdbs_bidi); |
3875 | atomic_set(&cmd->t_task_cdbs_left, cmd->t_task_list_num); | |
3876 | atomic_set(&cmd->t_task_cdbs_ex_left, cmd->t_task_list_num); | |
da0f7619 | 3877 | |
c66ac9db | 3878 | /* |
a1d8b49a | 3879 | * For WRITEs, let the fabric know its buffer is ready.. |
c66ac9db NB |
3880 | * This WRITE struct se_cmd (and all of its associated struct se_task's) |
3881 | * will be added to the struct se_device execution queue after its WRITE | |
3882 | * data has arrived. (ie: It gets handled by the transport processing | |
3883 | * thread a second time) | |
3884 | */ | |
3885 | if (cmd->data_direction == DMA_TO_DEVICE) { | |
3886 | transport_add_tasks_to_state_queue(cmd); | |
3887 | return transport_generic_write_pending(cmd); | |
3888 | } | |
3889 | /* | |
3890 | * Everything else but a WRITE, add the struct se_cmd's struct se_task's | |
3891 | * to the execution queue. | |
3892 | */ | |
3893 | transport_execute_tasks(cmd); | |
3894 | return 0; | |
da0f7619 CH |
3895 | |
3896 | out_fail: | |
3897 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
3898 | cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
3899 | return -EINVAL; | |
c66ac9db | 3900 | } |
a1d8b49a | 3901 | EXPORT_SYMBOL(transport_generic_new_cmd); |
c66ac9db NB |
3902 | |
3903 | /* transport_generic_process_write(): | |
3904 | * | |
3905 | * | |
3906 | */ | |
3907 | void transport_generic_process_write(struct se_cmd *cmd) | |
3908 | { | |
c66ac9db NB |
3909 | transport_execute_tasks(cmd); |
3910 | } | |
3911 | EXPORT_SYMBOL(transport_generic_process_write); | |
3912 | ||
e057f533 | 3913 | static void transport_write_pending_qf(struct se_cmd *cmd) |
07bde79a | 3914 | { |
f147abb4 NB |
3915 | int ret; |
3916 | ||
3917 | ret = cmd->se_tfo->write_pending(cmd); | |
3918 | if (ret == -EAGAIN || ret == -ENOMEM) { | |
e057f533 CH |
3919 | pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", |
3920 | cmd); | |
3921 | transport_handle_queue_full(cmd, cmd->se_dev); | |
3922 | } | |
07bde79a NB |
3923 | } |
3924 | ||
c66ac9db NB |
3925 | static int transport_generic_write_pending(struct se_cmd *cmd) |
3926 | { | |
3927 | unsigned long flags; | |
3928 | int ret; | |
3929 | ||
a1d8b49a | 3930 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 3931 | cmd->t_state = TRANSPORT_WRITE_PENDING; |
a1d8b49a | 3932 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
07bde79a | 3933 | |
c66ac9db NB |
3934 | /* |
3935 | * Clear the se_cmd for WRITE_PENDING status in order to set | |
7d680f3b CH |
3936 | * CMD_T_ACTIVE so that transport_generic_handle_data can be called |
3937 | * from HW target mode interrupt code. This is safe to be called | |
3938 | * with transport_off=1 before the cmd->se_tfo->write_pending | |
c66ac9db NB |
3939 | * because the se_cmd->se_lun pointer is not being cleared. |
3940 | */ | |
3941 | transport_cmd_check_stop(cmd, 1, 0); | |
3942 | ||
3943 | /* | |
3944 | * Call the fabric write_pending function here to let the | |
3945 | * frontend know that WRITE buffers are ready. | |
3946 | */ | |
e3d6f909 | 3947 | ret = cmd->se_tfo->write_pending(cmd); |
f147abb4 | 3948 | if (ret == -EAGAIN || ret == -ENOMEM) |
07bde79a NB |
3949 | goto queue_full; |
3950 | else if (ret < 0) | |
c66ac9db NB |
3951 | return ret; |
3952 | ||
03e98c9e | 3953 | return 1; |
07bde79a NB |
3954 | |
3955 | queue_full: | |
6708bb27 | 3956 | pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd); |
07bde79a | 3957 | cmd->t_state = TRANSPORT_COMPLETE_QF_WP; |
e057f533 | 3958 | transport_handle_queue_full(cmd, cmd->se_dev); |
f147abb4 | 3959 | return 0; |
c66ac9db NB |
3960 | } |
3961 | ||
39c05f32 | 3962 | void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks) |
c66ac9db | 3963 | { |
d14921d6 NB |
3964 | if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) { |
3965 | if (wait_for_tasks && cmd->se_tmr_req) | |
3966 | transport_wait_for_tasks(cmd); | |
3967 | ||
35462975 | 3968 | transport_release_cmd(cmd); |
d14921d6 NB |
3969 | } else { |
3970 | if (wait_for_tasks) | |
3971 | transport_wait_for_tasks(cmd); | |
3972 | ||
c66ac9db NB |
3973 | core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd); |
3974 | ||
82f1c8a4 | 3975 | if (cmd->se_lun) |
c66ac9db | 3976 | transport_lun_remove_cmd(cmd); |
c66ac9db | 3977 | |
f4366772 NB |
3978 | transport_free_dev_tasks(cmd); |
3979 | ||
39c05f32 | 3980 | transport_put_cmd(cmd); |
c66ac9db NB |
3981 | } |
3982 | } | |
3983 | EXPORT_SYMBOL(transport_generic_free_cmd); | |
3984 | ||
a17f091d NB |
3985 | /* target_get_sess_cmd - Add command to active ->sess_cmd_list |
3986 | * @se_sess: session to reference | |
3987 | * @se_cmd: command descriptor to add | |
a6360785 | 3988 | * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd() |
a17f091d | 3989 | */ |
a6360785 NB |
3990 | void target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd, |
3991 | bool ack_kref) | |
a17f091d NB |
3992 | { |
3993 | unsigned long flags; | |
3994 | ||
7481deb4 | 3995 | kref_init(&se_cmd->cmd_kref); |
a6360785 NB |
3996 | /* |
3997 | * Add a second kref if the fabric caller is expecting to handle | |
3998 | * fabric acknowledgement that requires two target_put_sess_cmd() | |
3999 | * invocations before se_cmd descriptor release. | |
4000 | */ | |
4001 | if (ack_kref == true) | |
4002 | kref_get(&se_cmd->cmd_kref); | |
7481deb4 | 4003 | |
a17f091d NB |
4004 | spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); |
4005 | list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list); | |
4006 | se_cmd->check_release = 1; | |
4007 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); | |
4008 | } | |
4009 | EXPORT_SYMBOL(target_get_sess_cmd); | |
4010 | ||
7481deb4 | 4011 | static void target_release_cmd_kref(struct kref *kref) |
a17f091d | 4012 | { |
7481deb4 NB |
4013 | struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref); |
4014 | struct se_session *se_sess = se_cmd->se_sess; | |
a17f091d NB |
4015 | unsigned long flags; |
4016 | ||
4017 | spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); | |
4018 | if (list_empty(&se_cmd->se_cmd_list)) { | |
4019 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); | |
4020 | WARN_ON(1); | |
7481deb4 | 4021 | return; |
a17f091d | 4022 | } |
a17f091d NB |
4023 | if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) { |
4024 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); | |
4025 | complete(&se_cmd->cmd_wait_comp); | |
7481deb4 | 4026 | return; |
a17f091d NB |
4027 | } |
4028 | list_del(&se_cmd->se_cmd_list); | |
4029 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); | |
4030 | ||
7481deb4 NB |
4031 | se_cmd->se_tfo->release_cmd(se_cmd); |
4032 | } | |
4033 | ||
4034 | /* target_put_sess_cmd - Check for active I/O shutdown via kref_put | |
4035 | * @se_sess: session to reference | |
4036 | * @se_cmd: command descriptor to drop | |
4037 | */ | |
4038 | int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd) | |
4039 | { | |
4040 | return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref); | |
a17f091d NB |
4041 | } |
4042 | EXPORT_SYMBOL(target_put_sess_cmd); | |
4043 | ||
4044 | /* target_splice_sess_cmd_list - Split active cmds into sess_wait_list | |
4045 | * @se_sess: session to split | |
4046 | */ | |
4047 | void target_splice_sess_cmd_list(struct se_session *se_sess) | |
4048 | { | |
4049 | struct se_cmd *se_cmd; | |
4050 | unsigned long flags; | |
4051 | ||
4052 | WARN_ON(!list_empty(&se_sess->sess_wait_list)); | |
4053 | INIT_LIST_HEAD(&se_sess->sess_wait_list); | |
4054 | ||
4055 | spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); | |
4056 | se_sess->sess_tearing_down = 1; | |
4057 | ||
4058 | list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list); | |
4059 | ||
4060 | list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list) | |
4061 | se_cmd->cmd_wait_set = 1; | |
4062 | ||
4063 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); | |
4064 | } | |
4065 | EXPORT_SYMBOL(target_splice_sess_cmd_list); | |
4066 | ||
4067 | /* target_wait_for_sess_cmds - Wait for outstanding descriptors | |
4068 | * @se_sess: session to wait for active I/O | |
4069 | * @wait_for_tasks: Make extra transport_wait_for_tasks call | |
4070 | */ | |
4071 | void target_wait_for_sess_cmds( | |
4072 | struct se_session *se_sess, | |
4073 | int wait_for_tasks) | |
4074 | { | |
4075 | struct se_cmd *se_cmd, *tmp_cmd; | |
4076 | bool rc = false; | |
4077 | ||
4078 | list_for_each_entry_safe(se_cmd, tmp_cmd, | |
4079 | &se_sess->sess_wait_list, se_cmd_list) { | |
4080 | list_del(&se_cmd->se_cmd_list); | |
4081 | ||
4082 | pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:" | |
4083 | " %d\n", se_cmd, se_cmd->t_state, | |
4084 | se_cmd->se_tfo->get_cmd_state(se_cmd)); | |
4085 | ||
4086 | if (wait_for_tasks) { | |
4087 | pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d," | |
4088 | " fabric state: %d\n", se_cmd, se_cmd->t_state, | |
4089 | se_cmd->se_tfo->get_cmd_state(se_cmd)); | |
4090 | ||
4091 | rc = transport_wait_for_tasks(se_cmd); | |
4092 | ||
4093 | pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d," | |
4094 | " fabric state: %d\n", se_cmd, se_cmd->t_state, | |
4095 | se_cmd->se_tfo->get_cmd_state(se_cmd)); | |
4096 | } | |
4097 | ||
4098 | if (!rc) { | |
4099 | wait_for_completion(&se_cmd->cmd_wait_comp); | |
4100 | pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d" | |
4101 | " fabric state: %d\n", se_cmd, se_cmd->t_state, | |
4102 | se_cmd->se_tfo->get_cmd_state(se_cmd)); | |
4103 | } | |
4104 | ||
4105 | se_cmd->se_tfo->release_cmd(se_cmd); | |
4106 | } | |
4107 | } | |
4108 | EXPORT_SYMBOL(target_wait_for_sess_cmds); | |
4109 | ||
c66ac9db NB |
4110 | /* transport_lun_wait_for_tasks(): |
4111 | * | |
4112 | * Called from ConfigFS context to stop the passed struct se_cmd to allow | |
4113 | * an struct se_lun to be successfully shutdown. | |
4114 | */ | |
4115 | static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun) | |
4116 | { | |
4117 | unsigned long flags; | |
4118 | int ret; | |
4119 | /* | |
4120 | * If the frontend has already requested this struct se_cmd to | |
4121 | * be stopped, we can safely ignore this struct se_cmd. | |
4122 | */ | |
a1d8b49a | 4123 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
7d680f3b CH |
4124 | if (cmd->transport_state & CMD_T_STOP) { |
4125 | cmd->transport_state &= ~CMD_T_LUN_STOP; | |
4126 | ||
4127 | pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n", | |
4128 | cmd->se_tfo->get_task_tag(cmd)); | |
a1d8b49a | 4129 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 4130 | transport_cmd_check_stop(cmd, 1, 0); |
e3d6f909 | 4131 | return -EPERM; |
c66ac9db | 4132 | } |
7d680f3b | 4133 | cmd->transport_state |= CMD_T_LUN_FE_STOP; |
a1d8b49a | 4134 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 4135 | |
5951146d | 4136 | wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq); |
c66ac9db NB |
4137 | |
4138 | ret = transport_stop_tasks_for_cmd(cmd); | |
4139 | ||
6708bb27 AG |
4140 | pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:" |
4141 | " %d\n", cmd, cmd->t_task_list_num, ret); | |
c66ac9db | 4142 | if (!ret) { |
6708bb27 | 4143 | pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n", |
e3d6f909 | 4144 | cmd->se_tfo->get_task_tag(cmd)); |
a1d8b49a | 4145 | wait_for_completion(&cmd->transport_lun_stop_comp); |
6708bb27 | 4146 | pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n", |
e3d6f909 | 4147 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 4148 | } |
3df8d40b | 4149 | transport_remove_cmd_from_queue(cmd); |
c66ac9db NB |
4150 | |
4151 | return 0; | |
4152 | } | |
4153 | ||
c66ac9db NB |
4154 | static void __transport_clear_lun_from_sessions(struct se_lun *lun) |
4155 | { | |
4156 | struct se_cmd *cmd = NULL; | |
4157 | unsigned long lun_flags, cmd_flags; | |
4158 | /* | |
4159 | * Do exception processing and return CHECK_CONDITION status to the | |
4160 | * Initiator Port. | |
4161 | */ | |
4162 | spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags); | |
5951146d AG |
4163 | while (!list_empty(&lun->lun_cmd_list)) { |
4164 | cmd = list_first_entry(&lun->lun_cmd_list, | |
4165 | struct se_cmd, se_lun_node); | |
4166 | list_del(&cmd->se_lun_node); | |
4167 | ||
a1d8b49a | 4168 | atomic_set(&cmd->transport_lun_active, 0); |
c66ac9db NB |
4169 | /* |
4170 | * This will notify iscsi_target_transport.c: | |
4171 | * transport_cmd_check_stop() that a LUN shutdown is in | |
4172 | * progress for the iscsi_cmd_t. | |
4173 | */ | |
a1d8b49a | 4174 | spin_lock(&cmd->t_state_lock); |
6708bb27 | 4175 | pr_debug("SE_LUN[%d] - Setting cmd->transport" |
c66ac9db | 4176 | "_lun_stop for ITT: 0x%08x\n", |
e3d6f909 AG |
4177 | cmd->se_lun->unpacked_lun, |
4178 | cmd->se_tfo->get_task_tag(cmd)); | |
7d680f3b | 4179 | cmd->transport_state |= CMD_T_LUN_STOP; |
a1d8b49a | 4180 | spin_unlock(&cmd->t_state_lock); |
c66ac9db NB |
4181 | |
4182 | spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags); | |
4183 | ||
6708bb27 AG |
4184 | if (!cmd->se_lun) { |
4185 | pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n", | |
e3d6f909 AG |
4186 | cmd->se_tfo->get_task_tag(cmd), |
4187 | cmd->se_tfo->get_cmd_state(cmd), cmd->t_state); | |
c66ac9db NB |
4188 | BUG(); |
4189 | } | |
4190 | /* | |
4191 | * If the Storage engine still owns the iscsi_cmd_t, determine | |
4192 | * and/or stop its context. | |
4193 | */ | |
6708bb27 | 4194 | pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport" |
e3d6f909 AG |
4195 | "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun, |
4196 | cmd->se_tfo->get_task_tag(cmd)); | |
c66ac9db | 4197 | |
e3d6f909 | 4198 | if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) { |
c66ac9db NB |
4199 | spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags); |
4200 | continue; | |
4201 | } | |
4202 | ||
6708bb27 | 4203 | pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun" |
c66ac9db | 4204 | "_wait_for_tasks(): SUCCESS\n", |
e3d6f909 AG |
4205 | cmd->se_lun->unpacked_lun, |
4206 | cmd->se_tfo->get_task_tag(cmd)); | |
c66ac9db | 4207 | |
a1d8b49a | 4208 | spin_lock_irqsave(&cmd->t_state_lock, cmd_flags); |
7d680f3b | 4209 | if (!(cmd->transport_state & CMD_T_DEV_ACTIVE)) { |
a1d8b49a | 4210 | spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags); |
c66ac9db NB |
4211 | goto check_cond; |
4212 | } | |
7d680f3b | 4213 | cmd->transport_state &= ~CMD_T_DEV_ACTIVE; |
c66ac9db | 4214 | transport_all_task_dev_remove_state(cmd); |
a1d8b49a | 4215 | spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags); |
c66ac9db NB |
4216 | |
4217 | transport_free_dev_tasks(cmd); | |
4218 | /* | |
4219 | * The Storage engine stopped this struct se_cmd before it was | |
4220 | * send to the fabric frontend for delivery back to the | |
4221 | * Initiator Node. Return this SCSI CDB back with an | |
4222 | * CHECK_CONDITION status. | |
4223 | */ | |
4224 | check_cond: | |
4225 | transport_send_check_condition_and_sense(cmd, | |
4226 | TCM_NON_EXISTENT_LUN, 0); | |
4227 | /* | |
4228 | * If the fabric frontend is waiting for this iscsi_cmd_t to | |
4229 | * be released, notify the waiting thread now that LU has | |
4230 | * finished accessing it. | |
4231 | */ | |
a1d8b49a | 4232 | spin_lock_irqsave(&cmd->t_state_lock, cmd_flags); |
7d680f3b | 4233 | if (cmd->transport_state & CMD_T_LUN_FE_STOP) { |
6708bb27 | 4234 | pr_debug("SE_LUN[%d] - Detected FE stop for" |
c66ac9db NB |
4235 | " struct se_cmd: %p ITT: 0x%08x\n", |
4236 | lun->unpacked_lun, | |
e3d6f909 | 4237 | cmd, cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 4238 | |
a1d8b49a | 4239 | spin_unlock_irqrestore(&cmd->t_state_lock, |
c66ac9db NB |
4240 | cmd_flags); |
4241 | transport_cmd_check_stop(cmd, 1, 0); | |
a1d8b49a | 4242 | complete(&cmd->transport_lun_fe_stop_comp); |
c66ac9db NB |
4243 | spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags); |
4244 | continue; | |
4245 | } | |
6708bb27 | 4246 | pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n", |
e3d6f909 | 4247 | lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 4248 | |
a1d8b49a | 4249 | spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags); |
c66ac9db NB |
4250 | spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags); |
4251 | } | |
4252 | spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags); | |
4253 | } | |
4254 | ||
4255 | static int transport_clear_lun_thread(void *p) | |
4256 | { | |
8359cf43 | 4257 | struct se_lun *lun = p; |
c66ac9db NB |
4258 | |
4259 | __transport_clear_lun_from_sessions(lun); | |
4260 | complete(&lun->lun_shutdown_comp); | |
4261 | ||
4262 | return 0; | |
4263 | } | |
4264 | ||
4265 | int transport_clear_lun_from_sessions(struct se_lun *lun) | |
4266 | { | |
4267 | struct task_struct *kt; | |
4268 | ||
5951146d | 4269 | kt = kthread_run(transport_clear_lun_thread, lun, |
c66ac9db NB |
4270 | "tcm_cl_%u", lun->unpacked_lun); |
4271 | if (IS_ERR(kt)) { | |
6708bb27 | 4272 | pr_err("Unable to start clear_lun thread\n"); |
e3d6f909 | 4273 | return PTR_ERR(kt); |
c66ac9db NB |
4274 | } |
4275 | wait_for_completion(&lun->lun_shutdown_comp); | |
4276 | ||
4277 | return 0; | |
4278 | } | |
4279 | ||
d14921d6 NB |
4280 | /** |
4281 | * transport_wait_for_tasks - wait for completion to occur | |
4282 | * @cmd: command to wait | |
c66ac9db | 4283 | * |
d14921d6 NB |
4284 | * Called from frontend fabric context to wait for storage engine |
4285 | * to pause and/or release frontend generated struct se_cmd. | |
c66ac9db | 4286 | */ |
a17f091d | 4287 | bool transport_wait_for_tasks(struct se_cmd *cmd) |
c66ac9db NB |
4288 | { |
4289 | unsigned long flags; | |
4290 | ||
a1d8b49a | 4291 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
d14921d6 NB |
4292 | if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && !(cmd->se_tmr_req)) { |
4293 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
a17f091d | 4294 | return false; |
d14921d6 NB |
4295 | } |
4296 | /* | |
4297 | * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE | |
4298 | * has been set in transport_set_supported_SAM_opcode(). | |
4299 | */ | |
4300 | if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) && !cmd->se_tmr_req) { | |
4301 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
a17f091d | 4302 | return false; |
d14921d6 | 4303 | } |
c66ac9db NB |
4304 | /* |
4305 | * If we are already stopped due to an external event (ie: LUN shutdown) | |
4306 | * sleep until the connection can have the passed struct se_cmd back. | |
a1d8b49a | 4307 | * The cmd->transport_lun_stopped_sem will be upped by |
c66ac9db NB |
4308 | * transport_clear_lun_from_sessions() once the ConfigFS context caller |
4309 | * has completed its operation on the struct se_cmd. | |
4310 | */ | |
7d680f3b | 4311 | if (cmd->transport_state & CMD_T_LUN_STOP) { |
6708bb27 | 4312 | pr_debug("wait_for_tasks: Stopping" |
e3d6f909 | 4313 | " wait_for_completion(&cmd->t_tasktransport_lun_fe" |
c66ac9db | 4314 | "_stop_comp); for ITT: 0x%08x\n", |
e3d6f909 | 4315 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db NB |
4316 | /* |
4317 | * There is a special case for WRITES where a FE exception + | |
4318 | * LUN shutdown means ConfigFS context is still sleeping on | |
4319 | * transport_lun_stop_comp in transport_lun_wait_for_tasks(). | |
4320 | * We go ahead and up transport_lun_stop_comp just to be sure | |
4321 | * here. | |
4322 | */ | |
a1d8b49a AG |
4323 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
4324 | complete(&cmd->transport_lun_stop_comp); | |
4325 | wait_for_completion(&cmd->transport_lun_fe_stop_comp); | |
4326 | spin_lock_irqsave(&cmd->t_state_lock, flags); | |
c66ac9db NB |
4327 | |
4328 | transport_all_task_dev_remove_state(cmd); | |
4329 | /* | |
4330 | * At this point, the frontend who was the originator of this | |
4331 | * struct se_cmd, now owns the structure and can be released through | |
4332 | * normal means below. | |
4333 | */ | |
6708bb27 | 4334 | pr_debug("wait_for_tasks: Stopped" |
e3d6f909 | 4335 | " wait_for_completion(&cmd->t_tasktransport_lun_fe_" |
c66ac9db | 4336 | "stop_comp); for ITT: 0x%08x\n", |
e3d6f909 | 4337 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 4338 | |
7d680f3b | 4339 | cmd->transport_state &= ~CMD_T_LUN_STOP; |
c66ac9db | 4340 | } |
7d680f3b CH |
4341 | |
4342 | if (!(cmd->transport_state & CMD_T_ACTIVE) || | |
4343 | (cmd->transport_state & CMD_T_ABORTED)) { | |
d14921d6 | 4344 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
a17f091d | 4345 | return false; |
d14921d6 | 4346 | } |
c66ac9db | 4347 | |
7d680f3b | 4348 | cmd->transport_state |= CMD_T_STOP; |
c66ac9db | 4349 | |
6708bb27 | 4350 | pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x" |
7d680f3b | 4351 | " i_state: %d, t_state: %d, CMD_T_STOP\n", |
f2da9dbd CH |
4352 | cmd, cmd->se_tfo->get_task_tag(cmd), |
4353 | cmd->se_tfo->get_cmd_state(cmd), cmd->t_state); | |
c66ac9db | 4354 | |
a1d8b49a | 4355 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 4356 | |
5951146d | 4357 | wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq); |
c66ac9db | 4358 | |
a1d8b49a | 4359 | wait_for_completion(&cmd->t_transport_stop_comp); |
c66ac9db | 4360 | |
a1d8b49a | 4361 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
7d680f3b | 4362 | cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP); |
c66ac9db | 4363 | |
6708bb27 | 4364 | pr_debug("wait_for_tasks: Stopped wait_for_compltion(" |
a1d8b49a | 4365 | "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n", |
e3d6f909 | 4366 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 4367 | |
d14921d6 | 4368 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
a17f091d NB |
4369 | |
4370 | return true; | |
c66ac9db | 4371 | } |
d14921d6 | 4372 | EXPORT_SYMBOL(transport_wait_for_tasks); |
c66ac9db NB |
4373 | |
4374 | static int transport_get_sense_codes( | |
4375 | struct se_cmd *cmd, | |
4376 | u8 *asc, | |
4377 | u8 *ascq) | |
4378 | { | |
4379 | *asc = cmd->scsi_asc; | |
4380 | *ascq = cmd->scsi_ascq; | |
4381 | ||
4382 | return 0; | |
4383 | } | |
4384 | ||
4385 | static int transport_set_sense_codes( | |
4386 | struct se_cmd *cmd, | |
4387 | u8 asc, | |
4388 | u8 ascq) | |
4389 | { | |
4390 | cmd->scsi_asc = asc; | |
4391 | cmd->scsi_ascq = ascq; | |
4392 | ||
4393 | return 0; | |
4394 | } | |
4395 | ||
4396 | int transport_send_check_condition_and_sense( | |
4397 | struct se_cmd *cmd, | |
4398 | u8 reason, | |
4399 | int from_transport) | |
4400 | { | |
4401 | unsigned char *buffer = cmd->sense_buffer; | |
4402 | unsigned long flags; | |
4403 | int offset; | |
4404 | u8 asc = 0, ascq = 0; | |
4405 | ||
a1d8b49a | 4406 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 4407 | if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) { |
a1d8b49a | 4408 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
4409 | return 0; |
4410 | } | |
4411 | cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION; | |
a1d8b49a | 4412 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
4413 | |
4414 | if (!reason && from_transport) | |
4415 | goto after_reason; | |
4416 | ||
4417 | if (!from_transport) | |
4418 | cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE; | |
4419 | /* | |
4420 | * Data Segment and SenseLength of the fabric response PDU. | |
4421 | * | |
4422 | * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE | |
4423 | * from include/scsi/scsi_cmnd.h | |
4424 | */ | |
e3d6f909 | 4425 | offset = cmd->se_tfo->set_fabric_sense_len(cmd, |
c66ac9db NB |
4426 | TRANSPORT_SENSE_BUFFER); |
4427 | /* | |
4428 | * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses | |
4429 | * SENSE KEY values from include/scsi/scsi.h | |
4430 | */ | |
4431 | switch (reason) { | |
4432 | case TCM_NON_EXISTENT_LUN: | |
eb39d340 NB |
4433 | /* CURRENT ERROR */ |
4434 | buffer[offset] = 0x70; | |
895f3022 | 4435 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
eb39d340 NB |
4436 | /* ILLEGAL REQUEST */ |
4437 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; | |
4438 | /* LOGICAL UNIT NOT SUPPORTED */ | |
4439 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25; | |
4440 | break; | |
c66ac9db NB |
4441 | case TCM_UNSUPPORTED_SCSI_OPCODE: |
4442 | case TCM_SECTOR_COUNT_TOO_MANY: | |
4443 | /* CURRENT ERROR */ | |
4444 | buffer[offset] = 0x70; | |
895f3022 | 4445 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
4446 | /* ILLEGAL REQUEST */ |
4447 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; | |
4448 | /* INVALID COMMAND OPERATION CODE */ | |
4449 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20; | |
4450 | break; | |
4451 | case TCM_UNKNOWN_MODE_PAGE: | |
4452 | /* CURRENT ERROR */ | |
4453 | buffer[offset] = 0x70; | |
895f3022 | 4454 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
4455 | /* ILLEGAL REQUEST */ |
4456 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; | |
4457 | /* INVALID FIELD IN CDB */ | |
4458 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24; | |
4459 | break; | |
4460 | case TCM_CHECK_CONDITION_ABORT_CMD: | |
4461 | /* CURRENT ERROR */ | |
4462 | buffer[offset] = 0x70; | |
895f3022 | 4463 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
4464 | /* ABORTED COMMAND */ |
4465 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; | |
4466 | /* BUS DEVICE RESET FUNCTION OCCURRED */ | |
4467 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29; | |
4468 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03; | |
4469 | break; | |
4470 | case TCM_INCORRECT_AMOUNT_OF_DATA: | |
4471 | /* CURRENT ERROR */ | |
4472 | buffer[offset] = 0x70; | |
895f3022 | 4473 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
4474 | /* ABORTED COMMAND */ |
4475 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; | |
4476 | /* WRITE ERROR */ | |
4477 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c; | |
4478 | /* NOT ENOUGH UNSOLICITED DATA */ | |
4479 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d; | |
4480 | break; | |
4481 | case TCM_INVALID_CDB_FIELD: | |
4482 | /* CURRENT ERROR */ | |
4483 | buffer[offset] = 0x70; | |
895f3022 | 4484 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
9fbc8909 RD |
4485 | /* ILLEGAL REQUEST */ |
4486 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; | |
c66ac9db NB |
4487 | /* INVALID FIELD IN CDB */ |
4488 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24; | |
4489 | break; | |
4490 | case TCM_INVALID_PARAMETER_LIST: | |
4491 | /* CURRENT ERROR */ | |
4492 | buffer[offset] = 0x70; | |
895f3022 | 4493 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
9fbc8909 RD |
4494 | /* ILLEGAL REQUEST */ |
4495 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; | |
c66ac9db NB |
4496 | /* INVALID FIELD IN PARAMETER LIST */ |
4497 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26; | |
4498 | break; | |
4499 | case TCM_UNEXPECTED_UNSOLICITED_DATA: | |
4500 | /* CURRENT ERROR */ | |
4501 | buffer[offset] = 0x70; | |
895f3022 | 4502 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
4503 | /* ABORTED COMMAND */ |
4504 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; | |
4505 | /* WRITE ERROR */ | |
4506 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c; | |
4507 | /* UNEXPECTED_UNSOLICITED_DATA */ | |
4508 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c; | |
4509 | break; | |
4510 | case TCM_SERVICE_CRC_ERROR: | |
4511 | /* CURRENT ERROR */ | |
4512 | buffer[offset] = 0x70; | |
895f3022 | 4513 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
4514 | /* ABORTED COMMAND */ |
4515 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; | |
4516 | /* PROTOCOL SERVICE CRC ERROR */ | |
4517 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47; | |
4518 | /* N/A */ | |
4519 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05; | |
4520 | break; | |
4521 | case TCM_SNACK_REJECTED: | |
4522 | /* CURRENT ERROR */ | |
4523 | buffer[offset] = 0x70; | |
895f3022 | 4524 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
4525 | /* ABORTED COMMAND */ |
4526 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; | |
4527 | /* READ ERROR */ | |
4528 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11; | |
4529 | /* FAILED RETRANSMISSION REQUEST */ | |
4530 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13; | |
4531 | break; | |
4532 | case TCM_WRITE_PROTECTED: | |
4533 | /* CURRENT ERROR */ | |
4534 | buffer[offset] = 0x70; | |
895f3022 | 4535 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
4536 | /* DATA PROTECT */ |
4537 | buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT; | |
4538 | /* WRITE PROTECTED */ | |
4539 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27; | |
4540 | break; | |
4541 | case TCM_CHECK_CONDITION_UNIT_ATTENTION: | |
4542 | /* CURRENT ERROR */ | |
4543 | buffer[offset] = 0x70; | |
895f3022 | 4544 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
4545 | /* UNIT ATTENTION */ |
4546 | buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION; | |
4547 | core_scsi3_ua_for_check_condition(cmd, &asc, &ascq); | |
4548 | buffer[offset+SPC_ASC_KEY_OFFSET] = asc; | |
4549 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq; | |
4550 | break; | |
4551 | case TCM_CHECK_CONDITION_NOT_READY: | |
4552 | /* CURRENT ERROR */ | |
4553 | buffer[offset] = 0x70; | |
895f3022 | 4554 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
4555 | /* Not Ready */ |
4556 | buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY; | |
4557 | transport_get_sense_codes(cmd, &asc, &ascq); | |
4558 | buffer[offset+SPC_ASC_KEY_OFFSET] = asc; | |
4559 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq; | |
4560 | break; | |
4561 | case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE: | |
4562 | default: | |
4563 | /* CURRENT ERROR */ | |
4564 | buffer[offset] = 0x70; | |
895f3022 | 4565 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
4566 | /* ILLEGAL REQUEST */ |
4567 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; | |
4568 | /* LOGICAL UNIT COMMUNICATION FAILURE */ | |
4569 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80; | |
4570 | break; | |
4571 | } | |
4572 | /* | |
4573 | * This code uses linux/include/scsi/scsi.h SAM status codes! | |
4574 | */ | |
4575 | cmd->scsi_status = SAM_STAT_CHECK_CONDITION; | |
4576 | /* | |
4577 | * Automatically padded, this value is encoded in the fabric's | |
4578 | * data_length response PDU containing the SCSI defined sense data. | |
4579 | */ | |
4580 | cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset; | |
4581 | ||
4582 | after_reason: | |
07bde79a | 4583 | return cmd->se_tfo->queue_status(cmd); |
c66ac9db NB |
4584 | } |
4585 | EXPORT_SYMBOL(transport_send_check_condition_and_sense); | |
4586 | ||
4587 | int transport_check_aborted_status(struct se_cmd *cmd, int send_status) | |
4588 | { | |
4589 | int ret = 0; | |
4590 | ||
7d680f3b | 4591 | if (cmd->transport_state & CMD_T_ABORTED) { |
6708bb27 | 4592 | if (!send_status || |
c66ac9db NB |
4593 | (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS)) |
4594 | return 1; | |
4595 | #if 0 | |
6708bb27 | 4596 | pr_debug("Sending delayed SAM_STAT_TASK_ABORTED" |
c66ac9db | 4597 | " status for CDB: 0x%02x ITT: 0x%08x\n", |
a1d8b49a | 4598 | cmd->t_task_cdb[0], |
e3d6f909 | 4599 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db NB |
4600 | #endif |
4601 | cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS; | |
e3d6f909 | 4602 | cmd->se_tfo->queue_status(cmd); |
c66ac9db NB |
4603 | ret = 1; |
4604 | } | |
4605 | return ret; | |
4606 | } | |
4607 | EXPORT_SYMBOL(transport_check_aborted_status); | |
4608 | ||
4609 | void transport_send_task_abort(struct se_cmd *cmd) | |
4610 | { | |
c252f003 NB |
4611 | unsigned long flags; |
4612 | ||
4613 | spin_lock_irqsave(&cmd->t_state_lock, flags); | |
4614 | if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) { | |
4615 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
4616 | return; | |
4617 | } | |
4618 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
4619 | ||
c66ac9db NB |
4620 | /* |
4621 | * If there are still expected incoming fabric WRITEs, we wait | |
4622 | * until until they have completed before sending a TASK_ABORTED | |
4623 | * response. This response with TASK_ABORTED status will be | |
4624 | * queued back to fabric module by transport_check_aborted_status(). | |
4625 | */ | |
4626 | if (cmd->data_direction == DMA_TO_DEVICE) { | |
e3d6f909 | 4627 | if (cmd->se_tfo->write_pending_status(cmd) != 0) { |
7d680f3b | 4628 | cmd->transport_state |= CMD_T_ABORTED; |
c66ac9db | 4629 | smp_mb__after_atomic_inc(); |
c66ac9db NB |
4630 | } |
4631 | } | |
4632 | cmd->scsi_status = SAM_STAT_TASK_ABORTED; | |
4633 | #if 0 | |
6708bb27 | 4634 | pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x," |
a1d8b49a | 4635 | " ITT: 0x%08x\n", cmd->t_task_cdb[0], |
e3d6f909 | 4636 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 4637 | #endif |
e3d6f909 | 4638 | cmd->se_tfo->queue_status(cmd); |
c66ac9db NB |
4639 | } |
4640 | ||
e26d99ae | 4641 | static int transport_generic_do_tmr(struct se_cmd *cmd) |
c66ac9db | 4642 | { |
5951146d | 4643 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
4644 | struct se_tmr_req *tmr = cmd->se_tmr_req; |
4645 | int ret; | |
4646 | ||
4647 | switch (tmr->function) { | |
5c6cd613 | 4648 | case TMR_ABORT_TASK: |
c66ac9db NB |
4649 | tmr->response = TMR_FUNCTION_REJECTED; |
4650 | break; | |
5c6cd613 NB |
4651 | case TMR_ABORT_TASK_SET: |
4652 | case TMR_CLEAR_ACA: | |
4653 | case TMR_CLEAR_TASK_SET: | |
c66ac9db NB |
4654 | tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED; |
4655 | break; | |
5c6cd613 | 4656 | case TMR_LUN_RESET: |
c66ac9db NB |
4657 | ret = core_tmr_lun_reset(dev, tmr, NULL, NULL); |
4658 | tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE : | |
4659 | TMR_FUNCTION_REJECTED; | |
4660 | break; | |
5c6cd613 | 4661 | case TMR_TARGET_WARM_RESET: |
c66ac9db NB |
4662 | tmr->response = TMR_FUNCTION_REJECTED; |
4663 | break; | |
5c6cd613 | 4664 | case TMR_TARGET_COLD_RESET: |
c66ac9db NB |
4665 | tmr->response = TMR_FUNCTION_REJECTED; |
4666 | break; | |
c66ac9db | 4667 | default: |
6708bb27 | 4668 | pr_err("Uknown TMR function: 0x%02x.\n", |
c66ac9db NB |
4669 | tmr->function); |
4670 | tmr->response = TMR_FUNCTION_REJECTED; | |
4671 | break; | |
4672 | } | |
4673 | ||
4674 | cmd->t_state = TRANSPORT_ISTATE_PROCESSING; | |
e3d6f909 | 4675 | cmd->se_tfo->queue_tm_rsp(cmd); |
c66ac9db | 4676 | |
b7b8bef7 | 4677 | transport_cmd_check_stop_to_fabric(cmd); |
c66ac9db NB |
4678 | return 0; |
4679 | } | |
4680 | ||
c66ac9db NB |
4681 | /* transport_processing_thread(): |
4682 | * | |
4683 | * | |
4684 | */ | |
4685 | static int transport_processing_thread(void *param) | |
4686 | { | |
5951146d | 4687 | int ret; |
c66ac9db | 4688 | struct se_cmd *cmd; |
8359cf43 | 4689 | struct se_device *dev = param; |
c66ac9db | 4690 | |
c66ac9db | 4691 | while (!kthread_should_stop()) { |
e3d6f909 AG |
4692 | ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq, |
4693 | atomic_read(&dev->dev_queue_obj.queue_cnt) || | |
c66ac9db NB |
4694 | kthread_should_stop()); |
4695 | if (ret < 0) | |
4696 | goto out; | |
4697 | ||
c66ac9db | 4698 | get_cmd: |
5951146d AG |
4699 | cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj); |
4700 | if (!cmd) | |
c66ac9db NB |
4701 | continue; |
4702 | ||
5951146d | 4703 | switch (cmd->t_state) { |
680b73c5 CH |
4704 | case TRANSPORT_NEW_CMD: |
4705 | BUG(); | |
4706 | break; | |
c66ac9db | 4707 | case TRANSPORT_NEW_CMD_MAP: |
6708bb27 AG |
4708 | if (!cmd->se_tfo->new_cmd_map) { |
4709 | pr_err("cmd->se_tfo->new_cmd_map is" | |
c66ac9db NB |
4710 | " NULL for TRANSPORT_NEW_CMD_MAP\n"); |
4711 | BUG(); | |
4712 | } | |
e3d6f909 | 4713 | ret = cmd->se_tfo->new_cmd_map(cmd); |
c66ac9db | 4714 | if (ret < 0) { |
03e98c9e | 4715 | transport_generic_request_failure(cmd); |
c66ac9db NB |
4716 | break; |
4717 | } | |
c66ac9db | 4718 | ret = transport_generic_new_cmd(cmd); |
f147abb4 | 4719 | if (ret < 0) { |
03e98c9e NB |
4720 | transport_generic_request_failure(cmd); |
4721 | break; | |
c66ac9db NB |
4722 | } |
4723 | break; | |
4724 | case TRANSPORT_PROCESS_WRITE: | |
4725 | transport_generic_process_write(cmd); | |
4726 | break; | |
c66ac9db NB |
4727 | case TRANSPORT_PROCESS_TMR: |
4728 | transport_generic_do_tmr(cmd); | |
4729 | break; | |
07bde79a | 4730 | case TRANSPORT_COMPLETE_QF_WP: |
e057f533 CH |
4731 | transport_write_pending_qf(cmd); |
4732 | break; | |
4733 | case TRANSPORT_COMPLETE_QF_OK: | |
4734 | transport_complete_qf(cmd); | |
07bde79a | 4735 | break; |
c66ac9db | 4736 | default: |
f2da9dbd CH |
4737 | pr_err("Unknown t_state: %d for ITT: 0x%08x " |
4738 | "i_state: %d on SE LUN: %u\n", | |
4739 | cmd->t_state, | |
e3d6f909 AG |
4740 | cmd->se_tfo->get_task_tag(cmd), |
4741 | cmd->se_tfo->get_cmd_state(cmd), | |
4742 | cmd->se_lun->unpacked_lun); | |
c66ac9db NB |
4743 | BUG(); |
4744 | } | |
4745 | ||
4746 | goto get_cmd; | |
4747 | } | |
4748 | ||
4749 | out: | |
ce8762f6 NB |
4750 | WARN_ON(!list_empty(&dev->state_task_list)); |
4751 | WARN_ON(!list_empty(&dev->dev_queue_obj.qobj_list)); | |
c66ac9db NB |
4752 | dev->process_thread = NULL; |
4753 | return 0; | |
4754 | } |