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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 | * | |
440 | * 'transport_off = 1' determines if t_transport_active should be cleared. | |
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 | */ | |
a1d8b49a | 458 | if (atomic_read(&cmd->transport_lun_stop)) { |
6708bb27 | 459 | pr_debug("%s:%d atomic_read(&cmd->transport_lun_stop)" |
c66ac9db | 460 | " == TRUE for ITT: 0x%08x\n", __func__, __LINE__, |
e3d6f909 | 461 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 462 | |
a1d8b49a | 463 | atomic_set(&cmd->t_transport_active, 0); |
c66ac9db NB |
464 | if (transport_off == 2) |
465 | transport_all_task_dev_remove_state(cmd); | |
a1d8b49a | 466 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 467 | |
a1d8b49a | 468 | complete(&cmd->transport_lun_stop_comp); |
c66ac9db NB |
469 | return 1; |
470 | } | |
471 | /* | |
472 | * Determine if frontend context caller is requesting the stopping of | |
e3d6f909 | 473 | * this command for frontend exceptions. |
c66ac9db | 474 | */ |
a1d8b49a | 475 | if (atomic_read(&cmd->t_transport_stop)) { |
6708bb27 | 476 | pr_debug("%s:%d atomic_read(&cmd->t_transport_stop) ==" |
c66ac9db | 477 | " TRUE for ITT: 0x%08x\n", __func__, __LINE__, |
e3d6f909 | 478 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 479 | |
c66ac9db NB |
480 | if (transport_off == 2) |
481 | transport_all_task_dev_remove_state(cmd); | |
482 | ||
483 | /* | |
484 | * Clear struct se_cmd->se_lun before the transport_off == 2 handoff | |
485 | * to FE. | |
486 | */ | |
487 | if (transport_off == 2) | |
488 | cmd->se_lun = NULL; | |
a1d8b49a | 489 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 490 | |
a1d8b49a | 491 | complete(&cmd->t_transport_stop_comp); |
c66ac9db NB |
492 | return 1; |
493 | } | |
494 | if (transport_off) { | |
a1d8b49a | 495 | atomic_set(&cmd->t_transport_active, 0); |
c66ac9db NB |
496 | if (transport_off == 2) { |
497 | transport_all_task_dev_remove_state(cmd); | |
498 | /* | |
499 | * Clear struct se_cmd->se_lun before the transport_off == 2 | |
500 | * handoff to fabric module. | |
501 | */ | |
502 | cmd->se_lun = NULL; | |
503 | /* | |
504 | * Some fabric modules like tcm_loop can release | |
25985edc | 505 | * their internally allocated I/O reference now and |
c66ac9db | 506 | * struct se_cmd now. |
88dd9e26 NB |
507 | * |
508 | * Fabric modules are expected to return '1' here if the | |
509 | * se_cmd being passed is released at this point, | |
510 | * or zero if not being released. | |
c66ac9db | 511 | */ |
e3d6f909 | 512 | if (cmd->se_tfo->check_stop_free != NULL) { |
c66ac9db | 513 | spin_unlock_irqrestore( |
a1d8b49a | 514 | &cmd->t_state_lock, flags); |
c66ac9db | 515 | |
88dd9e26 | 516 | return cmd->se_tfo->check_stop_free(cmd); |
c66ac9db NB |
517 | } |
518 | } | |
a1d8b49a | 519 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
520 | |
521 | return 0; | |
522 | } else if (t_state) | |
523 | cmd->t_state = t_state; | |
a1d8b49a | 524 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
525 | |
526 | return 0; | |
527 | } | |
528 | ||
529 | static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd) | |
530 | { | |
531 | return transport_cmd_check_stop(cmd, 2, 0); | |
532 | } | |
533 | ||
534 | static void transport_lun_remove_cmd(struct se_cmd *cmd) | |
535 | { | |
e3d6f909 | 536 | struct se_lun *lun = cmd->se_lun; |
c66ac9db NB |
537 | unsigned long flags; |
538 | ||
539 | if (!lun) | |
540 | return; | |
541 | ||
a1d8b49a | 542 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
6708bb27 | 543 | if (!atomic_read(&cmd->transport_dev_active)) { |
a1d8b49a | 544 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
545 | goto check_lun; |
546 | } | |
a1d8b49a | 547 | atomic_set(&cmd->transport_dev_active, 0); |
c66ac9db | 548 | transport_all_task_dev_remove_state(cmd); |
a1d8b49a | 549 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 550 | |
c66ac9db NB |
551 | |
552 | check_lun: | |
553 | spin_lock_irqsave(&lun->lun_cmd_lock, flags); | |
a1d8b49a | 554 | if (atomic_read(&cmd->transport_lun_active)) { |
5951146d | 555 | list_del(&cmd->se_lun_node); |
a1d8b49a | 556 | atomic_set(&cmd->transport_lun_active, 0); |
c66ac9db | 557 | #if 0 |
6708bb27 | 558 | pr_debug("Removed ITT: 0x%08x from LUN LIST[%d]\n" |
e3d6f909 | 559 | cmd->se_tfo->get_task_tag(cmd), lun->unpacked_lun); |
c66ac9db NB |
560 | #endif |
561 | } | |
562 | spin_unlock_irqrestore(&lun->lun_cmd_lock, flags); | |
563 | } | |
564 | ||
565 | void transport_cmd_finish_abort(struct se_cmd *cmd, int remove) | |
566 | { | |
8dc52b54 NB |
567 | if (!cmd->se_tmr_req) |
568 | transport_lun_remove_cmd(cmd); | |
c66ac9db NB |
569 | |
570 | if (transport_cmd_check_stop_to_fabric(cmd)) | |
571 | return; | |
77039d1e | 572 | if (remove) { |
3df8d40b | 573 | transport_remove_cmd_from_queue(cmd); |
e6a2573f | 574 | transport_put_cmd(cmd); |
77039d1e | 575 | } |
c66ac9db NB |
576 | } |
577 | ||
f7a5cc0b CH |
578 | static void transport_add_cmd_to_queue(struct se_cmd *cmd, int t_state, |
579 | bool at_head) | |
c66ac9db NB |
580 | { |
581 | struct se_device *dev = cmd->se_dev; | |
e3d6f909 | 582 | struct se_queue_obj *qobj = &dev->dev_queue_obj; |
c66ac9db NB |
583 | unsigned long flags; |
584 | ||
c66ac9db | 585 | if (t_state) { |
a1d8b49a | 586 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 587 | cmd->t_state = t_state; |
a1d8b49a AG |
588 | atomic_set(&cmd->t_transport_active, 1); |
589 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
c66ac9db NB |
590 | } |
591 | ||
592 | spin_lock_irqsave(&qobj->cmd_queue_lock, flags); | |
79a7fef2 RD |
593 | |
594 | /* If the cmd is already on the list, remove it before we add it */ | |
595 | if (!list_empty(&cmd->se_queue_node)) | |
596 | list_del(&cmd->se_queue_node); | |
597 | else | |
598 | atomic_inc(&qobj->queue_cnt); | |
599 | ||
f7a5cc0b | 600 | if (at_head) |
07bde79a | 601 | list_add(&cmd->se_queue_node, &qobj->qobj_list); |
f7a5cc0b | 602 | else |
07bde79a | 603 | list_add_tail(&cmd->se_queue_node, &qobj->qobj_list); |
79a7fef2 | 604 | atomic_set(&cmd->t_transport_queue_active, 1); |
c66ac9db NB |
605 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); |
606 | ||
c66ac9db | 607 | wake_up_interruptible(&qobj->thread_wq); |
c66ac9db NB |
608 | } |
609 | ||
5951146d AG |
610 | static struct se_cmd * |
611 | transport_get_cmd_from_queue(struct se_queue_obj *qobj) | |
c66ac9db | 612 | { |
5951146d | 613 | struct se_cmd *cmd; |
c66ac9db NB |
614 | unsigned long flags; |
615 | ||
616 | spin_lock_irqsave(&qobj->cmd_queue_lock, flags); | |
617 | if (list_empty(&qobj->qobj_list)) { | |
618 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); | |
619 | return NULL; | |
620 | } | |
5951146d | 621 | cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node); |
c66ac9db | 622 | |
79a7fef2 | 623 | atomic_set(&cmd->t_transport_queue_active, 0); |
c66ac9db | 624 | |
79a7fef2 | 625 | list_del_init(&cmd->se_queue_node); |
c66ac9db NB |
626 | atomic_dec(&qobj->queue_cnt); |
627 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); | |
628 | ||
5951146d | 629 | return cmd; |
c66ac9db NB |
630 | } |
631 | ||
3df8d40b | 632 | static void transport_remove_cmd_from_queue(struct se_cmd *cmd) |
c66ac9db | 633 | { |
3df8d40b | 634 | struct se_queue_obj *qobj = &cmd->se_dev->dev_queue_obj; |
c66ac9db NB |
635 | unsigned long flags; |
636 | ||
637 | spin_lock_irqsave(&qobj->cmd_queue_lock, flags); | |
6708bb27 | 638 | if (!atomic_read(&cmd->t_transport_queue_active)) { |
c66ac9db NB |
639 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); |
640 | return; | |
641 | } | |
79a7fef2 RD |
642 | atomic_set(&cmd->t_transport_queue_active, 0); |
643 | atomic_dec(&qobj->queue_cnt); | |
644 | list_del_init(&cmd->se_queue_node); | |
c66ac9db NB |
645 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); |
646 | ||
a1d8b49a | 647 | if (atomic_read(&cmd->t_transport_queue_active)) { |
6708bb27 | 648 | pr_err("ITT: 0x%08x t_transport_queue_active: %d\n", |
e3d6f909 | 649 | cmd->se_tfo->get_task_tag(cmd), |
a1d8b49a | 650 | atomic_read(&cmd->t_transport_queue_active)); |
c66ac9db NB |
651 | } |
652 | } | |
653 | ||
654 | /* | |
655 | * Completion function used by TCM subsystem plugins (such as FILEIO) | |
656 | * for queueing up response from struct se_subsystem_api->do_task() | |
657 | */ | |
658 | void transport_complete_sync_cache(struct se_cmd *cmd, int good) | |
659 | { | |
a1d8b49a | 660 | struct se_task *task = list_entry(cmd->t_task_list.next, |
c66ac9db NB |
661 | struct se_task, t_list); |
662 | ||
663 | if (good) { | |
664 | cmd->scsi_status = SAM_STAT_GOOD; | |
665 | task->task_scsi_status = GOOD; | |
666 | } else { | |
667 | task->task_scsi_status = SAM_STAT_CHECK_CONDITION; | |
03e98c9e NB |
668 | task->task_se_cmd->scsi_sense_reason = |
669 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
670 | ||
c66ac9db NB |
671 | } |
672 | ||
673 | transport_complete_task(task, good); | |
674 | } | |
675 | EXPORT_SYMBOL(transport_complete_sync_cache); | |
676 | ||
35e0e757 CH |
677 | static void target_complete_failure_work(struct work_struct *work) |
678 | { | |
679 | struct se_cmd *cmd = container_of(work, struct se_cmd, work); | |
680 | ||
03e98c9e | 681 | transport_generic_request_failure(cmd); |
35e0e757 CH |
682 | } |
683 | ||
c66ac9db NB |
684 | /* transport_complete_task(): |
685 | * | |
686 | * Called from interrupt and non interrupt context depending | |
687 | * on the transport plugin. | |
688 | */ | |
689 | void transport_complete_task(struct se_task *task, int success) | |
690 | { | |
e3d6f909 | 691 | struct se_cmd *cmd = task->task_se_cmd; |
42bf829e | 692 | struct se_device *dev = cmd->se_dev; |
c66ac9db | 693 | unsigned long flags; |
c66ac9db | 694 | |
a1d8b49a | 695 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
6c76bf95 | 696 | task->task_flags &= ~TF_ACTIVE; |
c66ac9db NB |
697 | |
698 | /* | |
699 | * See if any sense data exists, if so set the TASK_SENSE flag. | |
700 | * Also check for any other post completion work that needs to be | |
701 | * done by the plugins. | |
702 | */ | |
703 | if (dev && dev->transport->transport_complete) { | |
704 | if (dev->transport->transport_complete(task) != 0) { | |
705 | cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE; | |
ef804a84 | 706 | task->task_flags |= TF_HAS_SENSE; |
c66ac9db NB |
707 | success = 1; |
708 | } | |
709 | } | |
710 | ||
711 | /* | |
712 | * See if we are waiting for outstanding struct se_task | |
713 | * to complete for an exception condition | |
714 | */ | |
6c76bf95 | 715 | if (task->task_flags & TF_REQUEST_STOP) { |
a1d8b49a | 716 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
717 | complete(&task->task_stop_comp); |
718 | return; | |
719 | } | |
2235007c CH |
720 | |
721 | if (!success) | |
722 | cmd->t_tasks_failed = 1; | |
723 | ||
c66ac9db NB |
724 | /* |
725 | * Decrement the outstanding t_task_cdbs_left count. The last | |
726 | * struct se_task from struct se_cmd will complete itself into the | |
727 | * device queue depending upon int success. | |
728 | */ | |
6708bb27 | 729 | if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) { |
a1d8b49a | 730 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
731 | return; |
732 | } | |
733 | ||
2235007c | 734 | if (cmd->t_tasks_failed) { |
41e16e98 | 735 | cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
35e0e757 | 736 | INIT_WORK(&cmd->work, target_complete_failure_work); |
c66ac9db | 737 | } else { |
a1d8b49a | 738 | atomic_set(&cmd->t_transport_complete, 1); |
35e0e757 | 739 | INIT_WORK(&cmd->work, target_complete_ok_work); |
c66ac9db | 740 | } |
35e0e757 | 741 | |
35e0e757 CH |
742 | cmd->t_state = TRANSPORT_COMPLETE; |
743 | atomic_set(&cmd->t_transport_active, 1); | |
a1d8b49a | 744 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 745 | |
35e0e757 | 746 | queue_work(target_completion_wq, &cmd->work); |
c66ac9db NB |
747 | } |
748 | EXPORT_SYMBOL(transport_complete_task); | |
749 | ||
750 | /* | |
751 | * Called by transport_add_tasks_from_cmd() once a struct se_cmd's | |
752 | * struct se_task list are ready to be added to the active execution list | |
753 | * struct se_device | |
754 | ||
755 | * Called with se_dev_t->execute_task_lock called. | |
756 | */ | |
757 | static inline int transport_add_task_check_sam_attr( | |
758 | struct se_task *task, | |
759 | struct se_task *task_prev, | |
760 | struct se_device *dev) | |
761 | { | |
762 | /* | |
763 | * No SAM Task attribute emulation enabled, add to tail of | |
764 | * execution queue | |
765 | */ | |
766 | if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) { | |
767 | list_add_tail(&task->t_execute_list, &dev->execute_task_list); | |
768 | return 0; | |
769 | } | |
770 | /* | |
771 | * HEAD_OF_QUEUE attribute for received CDB, which means | |
772 | * the first task that is associated with a struct se_cmd goes to | |
773 | * head of the struct se_device->execute_task_list, and task_prev | |
774 | * after that for each subsequent task | |
775 | */ | |
e66ecd50 | 776 | if (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG) { |
c66ac9db NB |
777 | list_add(&task->t_execute_list, |
778 | (task_prev != NULL) ? | |
779 | &task_prev->t_execute_list : | |
780 | &dev->execute_task_list); | |
781 | ||
6708bb27 | 782 | pr_debug("Set HEAD_OF_QUEUE for task CDB: 0x%02x" |
c66ac9db | 783 | " in execution queue\n", |
6708bb27 | 784 | task->task_se_cmd->t_task_cdb[0]); |
c66ac9db NB |
785 | return 1; |
786 | } | |
787 | /* | |
788 | * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been | |
789 | * transitioned from Dermant -> Active state, and are added to the end | |
790 | * of the struct se_device->execute_task_list | |
791 | */ | |
792 | list_add_tail(&task->t_execute_list, &dev->execute_task_list); | |
793 | return 0; | |
794 | } | |
795 | ||
796 | /* __transport_add_task_to_execute_queue(): | |
797 | * | |
798 | * Called with se_dev_t->execute_task_lock called. | |
799 | */ | |
800 | static void __transport_add_task_to_execute_queue( | |
801 | struct se_task *task, | |
802 | struct se_task *task_prev, | |
803 | struct se_device *dev) | |
804 | { | |
805 | int head_of_queue; | |
806 | ||
807 | head_of_queue = transport_add_task_check_sam_attr(task, task_prev, dev); | |
808 | atomic_inc(&dev->execute_tasks); | |
809 | ||
1880807a | 810 | if (task->t_state_active) |
c66ac9db NB |
811 | return; |
812 | /* | |
813 | * Determine if this task needs to go to HEAD_OF_QUEUE for the | |
814 | * state list as well. Running with SAM Task Attribute emulation | |
815 | * will always return head_of_queue == 0 here | |
816 | */ | |
817 | if (head_of_queue) | |
818 | list_add(&task->t_state_list, (task_prev) ? | |
819 | &task_prev->t_state_list : | |
820 | &dev->state_task_list); | |
821 | else | |
822 | list_add_tail(&task->t_state_list, &dev->state_task_list); | |
823 | ||
1880807a | 824 | task->t_state_active = true; |
c66ac9db | 825 | |
6708bb27 | 826 | pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n", |
e3d6f909 | 827 | task->task_se_cmd->se_tfo->get_task_tag(task->task_se_cmd), |
c66ac9db NB |
828 | task, dev); |
829 | } | |
830 | ||
831 | static void transport_add_tasks_to_state_queue(struct se_cmd *cmd) | |
832 | { | |
42bf829e | 833 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
834 | struct se_task *task; |
835 | unsigned long flags; | |
836 | ||
a1d8b49a AG |
837 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
838 | list_for_each_entry(task, &cmd->t_task_list, t_list) { | |
c66ac9db | 839 | spin_lock(&dev->execute_task_lock); |
1880807a CH |
840 | if (!task->t_state_active) { |
841 | list_add_tail(&task->t_state_list, | |
842 | &dev->state_task_list); | |
843 | task->t_state_active = true; | |
844 | ||
845 | pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n", | |
846 | task->task_se_cmd->se_tfo->get_task_tag( | |
847 | task->task_se_cmd), task, dev); | |
848 | } | |
c66ac9db NB |
849 | spin_unlock(&dev->execute_task_lock); |
850 | } | |
a1d8b49a | 851 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
852 | } |
853 | ||
4d2300cc | 854 | static void __transport_add_tasks_from_cmd(struct se_cmd *cmd) |
c66ac9db | 855 | { |
5951146d | 856 | struct se_device *dev = cmd->se_dev; |
c66ac9db | 857 | struct se_task *task, *task_prev = NULL; |
c66ac9db | 858 | |
a1d8b49a | 859 | list_for_each_entry(task, &cmd->t_task_list, t_list) { |
04629b7b | 860 | if (!list_empty(&task->t_execute_list)) |
c66ac9db NB |
861 | continue; |
862 | /* | |
863 | * __transport_add_task_to_execute_queue() handles the | |
864 | * SAM Task Attribute emulation if enabled | |
865 | */ | |
866 | __transport_add_task_to_execute_queue(task, task_prev, dev); | |
c66ac9db NB |
867 | task_prev = task; |
868 | } | |
4d2300cc NB |
869 | } |
870 | ||
871 | static void transport_add_tasks_from_cmd(struct se_cmd *cmd) | |
872 | { | |
873 | unsigned long flags; | |
874 | struct se_device *dev = cmd->se_dev; | |
875 | ||
876 | spin_lock_irqsave(&dev->execute_task_lock, flags); | |
877 | __transport_add_tasks_from_cmd(cmd); | |
c66ac9db | 878 | spin_unlock_irqrestore(&dev->execute_task_lock, flags); |
c66ac9db NB |
879 | } |
880 | ||
04629b7b CH |
881 | void __transport_remove_task_from_execute_queue(struct se_task *task, |
882 | struct se_device *dev) | |
883 | { | |
884 | list_del_init(&task->t_execute_list); | |
885 | atomic_dec(&dev->execute_tasks); | |
886 | } | |
887 | ||
e26d99ae | 888 | static void transport_remove_task_from_execute_queue( |
c66ac9db NB |
889 | struct se_task *task, |
890 | struct se_device *dev) | |
891 | { | |
892 | unsigned long flags; | |
893 | ||
04629b7b | 894 | if (WARN_ON(list_empty(&task->t_execute_list))) |
af57c3ac | 895 | return; |
af57c3ac | 896 | |
c66ac9db | 897 | spin_lock_irqsave(&dev->execute_task_lock, flags); |
04629b7b | 898 | __transport_remove_task_from_execute_queue(task, dev); |
c66ac9db NB |
899 | spin_unlock_irqrestore(&dev->execute_task_lock, flags); |
900 | } | |
901 | ||
07bde79a | 902 | /* |
f147abb4 | 903 | * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status |
07bde79a NB |
904 | */ |
905 | ||
906 | static void target_qf_do_work(struct work_struct *work) | |
907 | { | |
908 | struct se_device *dev = container_of(work, struct se_device, | |
909 | qf_work_queue); | |
bcac364a | 910 | LIST_HEAD(qf_cmd_list); |
07bde79a NB |
911 | struct se_cmd *cmd, *cmd_tmp; |
912 | ||
913 | spin_lock_irq(&dev->qf_cmd_lock); | |
bcac364a RD |
914 | list_splice_init(&dev->qf_cmd_list, &qf_cmd_list); |
915 | spin_unlock_irq(&dev->qf_cmd_lock); | |
07bde79a | 916 | |
bcac364a | 917 | list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) { |
07bde79a NB |
918 | list_del(&cmd->se_qf_node); |
919 | atomic_dec(&dev->dev_qf_count); | |
920 | smp_mb__after_atomic_dec(); | |
07bde79a | 921 | |
6708bb27 | 922 | pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue" |
07bde79a | 923 | " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd, |
e057f533 | 924 | (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" : |
07bde79a NB |
925 | (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING" |
926 | : "UNKNOWN"); | |
f7a5cc0b CH |
927 | |
928 | transport_add_cmd_to_queue(cmd, cmd->t_state, true); | |
07bde79a | 929 | } |
07bde79a NB |
930 | } |
931 | ||
c66ac9db NB |
932 | unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd) |
933 | { | |
934 | switch (cmd->data_direction) { | |
935 | case DMA_NONE: | |
936 | return "NONE"; | |
937 | case DMA_FROM_DEVICE: | |
938 | return "READ"; | |
939 | case DMA_TO_DEVICE: | |
940 | return "WRITE"; | |
941 | case DMA_BIDIRECTIONAL: | |
942 | return "BIDI"; | |
943 | default: | |
944 | break; | |
945 | } | |
946 | ||
947 | return "UNKNOWN"; | |
948 | } | |
949 | ||
950 | void transport_dump_dev_state( | |
951 | struct se_device *dev, | |
952 | char *b, | |
953 | int *bl) | |
954 | { | |
955 | *bl += sprintf(b + *bl, "Status: "); | |
956 | switch (dev->dev_status) { | |
957 | case TRANSPORT_DEVICE_ACTIVATED: | |
958 | *bl += sprintf(b + *bl, "ACTIVATED"); | |
959 | break; | |
960 | case TRANSPORT_DEVICE_DEACTIVATED: | |
961 | *bl += sprintf(b + *bl, "DEACTIVATED"); | |
962 | break; | |
963 | case TRANSPORT_DEVICE_SHUTDOWN: | |
964 | *bl += sprintf(b + *bl, "SHUTDOWN"); | |
965 | break; | |
966 | case TRANSPORT_DEVICE_OFFLINE_ACTIVATED: | |
967 | case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED: | |
968 | *bl += sprintf(b + *bl, "OFFLINE"); | |
969 | break; | |
970 | default: | |
971 | *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status); | |
972 | break; | |
973 | } | |
974 | ||
65586d51 NB |
975 | *bl += sprintf(b + *bl, " Execute/Max Queue Depth: %d/%d", |
976 | atomic_read(&dev->execute_tasks), dev->queue_depth); | |
c66ac9db | 977 | *bl += sprintf(b + *bl, " SectorSize: %u MaxSectors: %u\n", |
e3d6f909 | 978 | dev->se_sub_dev->se_dev_attrib.block_size, dev->se_sub_dev->se_dev_attrib.max_sectors); |
c66ac9db NB |
979 | *bl += sprintf(b + *bl, " "); |
980 | } | |
981 | ||
c66ac9db NB |
982 | void transport_dump_vpd_proto_id( |
983 | struct t10_vpd *vpd, | |
984 | unsigned char *p_buf, | |
985 | int p_buf_len) | |
986 | { | |
987 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
988 | int len; | |
989 | ||
990 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
991 | len = sprintf(buf, "T10 VPD Protocol Identifier: "); | |
992 | ||
993 | switch (vpd->protocol_identifier) { | |
994 | case 0x00: | |
995 | sprintf(buf+len, "Fibre Channel\n"); | |
996 | break; | |
997 | case 0x10: | |
998 | sprintf(buf+len, "Parallel SCSI\n"); | |
999 | break; | |
1000 | case 0x20: | |
1001 | sprintf(buf+len, "SSA\n"); | |
1002 | break; | |
1003 | case 0x30: | |
1004 | sprintf(buf+len, "IEEE 1394\n"); | |
1005 | break; | |
1006 | case 0x40: | |
1007 | sprintf(buf+len, "SCSI Remote Direct Memory Access" | |
1008 | " Protocol\n"); | |
1009 | break; | |
1010 | case 0x50: | |
1011 | sprintf(buf+len, "Internet SCSI (iSCSI)\n"); | |
1012 | break; | |
1013 | case 0x60: | |
1014 | sprintf(buf+len, "SAS Serial SCSI Protocol\n"); | |
1015 | break; | |
1016 | case 0x70: | |
1017 | sprintf(buf+len, "Automation/Drive Interface Transport" | |
1018 | " Protocol\n"); | |
1019 | break; | |
1020 | case 0x80: | |
1021 | sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n"); | |
1022 | break; | |
1023 | default: | |
1024 | sprintf(buf+len, "Unknown 0x%02x\n", | |
1025 | vpd->protocol_identifier); | |
1026 | break; | |
1027 | } | |
1028 | ||
1029 | if (p_buf) | |
1030 | strncpy(p_buf, buf, p_buf_len); | |
1031 | else | |
6708bb27 | 1032 | pr_debug("%s", buf); |
c66ac9db NB |
1033 | } |
1034 | ||
1035 | void | |
1036 | transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83) | |
1037 | { | |
1038 | /* | |
1039 | * Check if the Protocol Identifier Valid (PIV) bit is set.. | |
1040 | * | |
1041 | * from spc3r23.pdf section 7.5.1 | |
1042 | */ | |
1043 | if (page_83[1] & 0x80) { | |
1044 | vpd->protocol_identifier = (page_83[0] & 0xf0); | |
1045 | vpd->protocol_identifier_set = 1; | |
1046 | transport_dump_vpd_proto_id(vpd, NULL, 0); | |
1047 | } | |
1048 | } | |
1049 | EXPORT_SYMBOL(transport_set_vpd_proto_id); | |
1050 | ||
1051 | int transport_dump_vpd_assoc( | |
1052 | struct t10_vpd *vpd, | |
1053 | unsigned char *p_buf, | |
1054 | int p_buf_len) | |
1055 | { | |
1056 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
e3d6f909 AG |
1057 | int ret = 0; |
1058 | int len; | |
c66ac9db NB |
1059 | |
1060 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
1061 | len = sprintf(buf, "T10 VPD Identifier Association: "); | |
1062 | ||
1063 | switch (vpd->association) { | |
1064 | case 0x00: | |
1065 | sprintf(buf+len, "addressed logical unit\n"); | |
1066 | break; | |
1067 | case 0x10: | |
1068 | sprintf(buf+len, "target port\n"); | |
1069 | break; | |
1070 | case 0x20: | |
1071 | sprintf(buf+len, "SCSI target device\n"); | |
1072 | break; | |
1073 | default: | |
1074 | sprintf(buf+len, "Unknown 0x%02x\n", vpd->association); | |
e3d6f909 | 1075 | ret = -EINVAL; |
c66ac9db NB |
1076 | break; |
1077 | } | |
1078 | ||
1079 | if (p_buf) | |
1080 | strncpy(p_buf, buf, p_buf_len); | |
1081 | else | |
6708bb27 | 1082 | pr_debug("%s", buf); |
c66ac9db NB |
1083 | |
1084 | return ret; | |
1085 | } | |
1086 | ||
1087 | int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83) | |
1088 | { | |
1089 | /* | |
1090 | * The VPD identification association.. | |
1091 | * | |
1092 | * from spc3r23.pdf Section 7.6.3.1 Table 297 | |
1093 | */ | |
1094 | vpd->association = (page_83[1] & 0x30); | |
1095 | return transport_dump_vpd_assoc(vpd, NULL, 0); | |
1096 | } | |
1097 | EXPORT_SYMBOL(transport_set_vpd_assoc); | |
1098 | ||
1099 | int transport_dump_vpd_ident_type( | |
1100 | struct t10_vpd *vpd, | |
1101 | unsigned char *p_buf, | |
1102 | int p_buf_len) | |
1103 | { | |
1104 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
e3d6f909 AG |
1105 | int ret = 0; |
1106 | int len; | |
c66ac9db NB |
1107 | |
1108 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
1109 | len = sprintf(buf, "T10 VPD Identifier Type: "); | |
1110 | ||
1111 | switch (vpd->device_identifier_type) { | |
1112 | case 0x00: | |
1113 | sprintf(buf+len, "Vendor specific\n"); | |
1114 | break; | |
1115 | case 0x01: | |
1116 | sprintf(buf+len, "T10 Vendor ID based\n"); | |
1117 | break; | |
1118 | case 0x02: | |
1119 | sprintf(buf+len, "EUI-64 based\n"); | |
1120 | break; | |
1121 | case 0x03: | |
1122 | sprintf(buf+len, "NAA\n"); | |
1123 | break; | |
1124 | case 0x04: | |
1125 | sprintf(buf+len, "Relative target port identifier\n"); | |
1126 | break; | |
1127 | case 0x08: | |
1128 | sprintf(buf+len, "SCSI name string\n"); | |
1129 | break; | |
1130 | default: | |
1131 | sprintf(buf+len, "Unsupported: 0x%02x\n", | |
1132 | vpd->device_identifier_type); | |
e3d6f909 | 1133 | ret = -EINVAL; |
c66ac9db NB |
1134 | break; |
1135 | } | |
1136 | ||
e3d6f909 AG |
1137 | if (p_buf) { |
1138 | if (p_buf_len < strlen(buf)+1) | |
1139 | return -EINVAL; | |
c66ac9db | 1140 | strncpy(p_buf, buf, p_buf_len); |
e3d6f909 | 1141 | } else { |
6708bb27 | 1142 | pr_debug("%s", buf); |
e3d6f909 | 1143 | } |
c66ac9db NB |
1144 | |
1145 | return ret; | |
1146 | } | |
1147 | ||
1148 | int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83) | |
1149 | { | |
1150 | /* | |
1151 | * The VPD identifier type.. | |
1152 | * | |
1153 | * from spc3r23.pdf Section 7.6.3.1 Table 298 | |
1154 | */ | |
1155 | vpd->device_identifier_type = (page_83[1] & 0x0f); | |
1156 | return transport_dump_vpd_ident_type(vpd, NULL, 0); | |
1157 | } | |
1158 | EXPORT_SYMBOL(transport_set_vpd_ident_type); | |
1159 | ||
1160 | int transport_dump_vpd_ident( | |
1161 | struct t10_vpd *vpd, | |
1162 | unsigned char *p_buf, | |
1163 | int p_buf_len) | |
1164 | { | |
1165 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
1166 | int ret = 0; | |
1167 | ||
1168 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
1169 | ||
1170 | switch (vpd->device_identifier_code_set) { | |
1171 | case 0x01: /* Binary */ | |
1172 | sprintf(buf, "T10 VPD Binary Device Identifier: %s\n", | |
1173 | &vpd->device_identifier[0]); | |
1174 | break; | |
1175 | case 0x02: /* ASCII */ | |
1176 | sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n", | |
1177 | &vpd->device_identifier[0]); | |
1178 | break; | |
1179 | case 0x03: /* UTF-8 */ | |
1180 | sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n", | |
1181 | &vpd->device_identifier[0]); | |
1182 | break; | |
1183 | default: | |
1184 | sprintf(buf, "T10 VPD Device Identifier encoding unsupported:" | |
1185 | " 0x%02x", vpd->device_identifier_code_set); | |
e3d6f909 | 1186 | ret = -EINVAL; |
c66ac9db NB |
1187 | break; |
1188 | } | |
1189 | ||
1190 | if (p_buf) | |
1191 | strncpy(p_buf, buf, p_buf_len); | |
1192 | else | |
6708bb27 | 1193 | pr_debug("%s", buf); |
c66ac9db NB |
1194 | |
1195 | return ret; | |
1196 | } | |
1197 | ||
1198 | int | |
1199 | transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83) | |
1200 | { | |
1201 | static const char hex_str[] = "0123456789abcdef"; | |
1202 | int j = 0, i = 4; /* offset to start of the identifer */ | |
1203 | ||
1204 | /* | |
1205 | * The VPD Code Set (encoding) | |
1206 | * | |
1207 | * from spc3r23.pdf Section 7.6.3.1 Table 296 | |
1208 | */ | |
1209 | vpd->device_identifier_code_set = (page_83[0] & 0x0f); | |
1210 | switch (vpd->device_identifier_code_set) { | |
1211 | case 0x01: /* Binary */ | |
1212 | vpd->device_identifier[j++] = | |
1213 | hex_str[vpd->device_identifier_type]; | |
1214 | while (i < (4 + page_83[3])) { | |
1215 | vpd->device_identifier[j++] = | |
1216 | hex_str[(page_83[i] & 0xf0) >> 4]; | |
1217 | vpd->device_identifier[j++] = | |
1218 | hex_str[page_83[i] & 0x0f]; | |
1219 | i++; | |
1220 | } | |
1221 | break; | |
1222 | case 0x02: /* ASCII */ | |
1223 | case 0x03: /* UTF-8 */ | |
1224 | while (i < (4 + page_83[3])) | |
1225 | vpd->device_identifier[j++] = page_83[i++]; | |
1226 | break; | |
1227 | default: | |
1228 | break; | |
1229 | } | |
1230 | ||
1231 | return transport_dump_vpd_ident(vpd, NULL, 0); | |
1232 | } | |
1233 | EXPORT_SYMBOL(transport_set_vpd_ident); | |
1234 | ||
1235 | static void core_setup_task_attr_emulation(struct se_device *dev) | |
1236 | { | |
1237 | /* | |
1238 | * If this device is from Target_Core_Mod/pSCSI, disable the | |
1239 | * SAM Task Attribute emulation. | |
1240 | * | |
1241 | * This is currently not available in upsream Linux/SCSI Target | |
1242 | * mode code, and is assumed to be disabled while using TCM/pSCSI. | |
1243 | */ | |
e3d6f909 | 1244 | if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) { |
c66ac9db NB |
1245 | dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH; |
1246 | return; | |
1247 | } | |
1248 | ||
1249 | dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED; | |
6708bb27 | 1250 | pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x" |
e3d6f909 AG |
1251 | " device\n", dev->transport->name, |
1252 | dev->transport->get_device_rev(dev)); | |
c66ac9db NB |
1253 | } |
1254 | ||
1255 | static void scsi_dump_inquiry(struct se_device *dev) | |
1256 | { | |
e3d6f909 | 1257 | struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn; |
c66ac9db NB |
1258 | int i, device_type; |
1259 | /* | |
1260 | * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer | |
1261 | */ | |
6708bb27 | 1262 | pr_debug(" Vendor: "); |
c66ac9db NB |
1263 | for (i = 0; i < 8; i++) |
1264 | if (wwn->vendor[i] >= 0x20) | |
6708bb27 | 1265 | pr_debug("%c", wwn->vendor[i]); |
c66ac9db | 1266 | else |
6708bb27 | 1267 | pr_debug(" "); |
c66ac9db | 1268 | |
6708bb27 | 1269 | pr_debug(" Model: "); |
c66ac9db NB |
1270 | for (i = 0; i < 16; i++) |
1271 | if (wwn->model[i] >= 0x20) | |
6708bb27 | 1272 | pr_debug("%c", wwn->model[i]); |
c66ac9db | 1273 | else |
6708bb27 | 1274 | pr_debug(" "); |
c66ac9db | 1275 | |
6708bb27 | 1276 | pr_debug(" Revision: "); |
c66ac9db NB |
1277 | for (i = 0; i < 4; i++) |
1278 | if (wwn->revision[i] >= 0x20) | |
6708bb27 | 1279 | pr_debug("%c", wwn->revision[i]); |
c66ac9db | 1280 | else |
6708bb27 | 1281 | pr_debug(" "); |
c66ac9db | 1282 | |
6708bb27 | 1283 | pr_debug("\n"); |
c66ac9db | 1284 | |
e3d6f909 | 1285 | device_type = dev->transport->get_device_type(dev); |
6708bb27 AG |
1286 | pr_debug(" Type: %s ", scsi_device_type(device_type)); |
1287 | pr_debug(" ANSI SCSI revision: %02x\n", | |
e3d6f909 | 1288 | dev->transport->get_device_rev(dev)); |
c66ac9db NB |
1289 | } |
1290 | ||
1291 | struct se_device *transport_add_device_to_core_hba( | |
1292 | struct se_hba *hba, | |
1293 | struct se_subsystem_api *transport, | |
1294 | struct se_subsystem_dev *se_dev, | |
1295 | u32 device_flags, | |
1296 | void *transport_dev, | |
1297 | struct se_dev_limits *dev_limits, | |
1298 | const char *inquiry_prod, | |
1299 | const char *inquiry_rev) | |
1300 | { | |
12a18bdc | 1301 | int force_pt; |
c66ac9db NB |
1302 | struct se_device *dev; |
1303 | ||
1304 | dev = kzalloc(sizeof(struct se_device), GFP_KERNEL); | |
6708bb27 AG |
1305 | if (!dev) { |
1306 | pr_err("Unable to allocate memory for se_dev_t\n"); | |
c66ac9db NB |
1307 | return NULL; |
1308 | } | |
c66ac9db | 1309 | |
e3d6f909 | 1310 | transport_init_queue_obj(&dev->dev_queue_obj); |
c66ac9db NB |
1311 | dev->dev_flags = device_flags; |
1312 | dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED; | |
5951146d | 1313 | dev->dev_ptr = transport_dev; |
c66ac9db NB |
1314 | dev->se_hba = hba; |
1315 | dev->se_sub_dev = se_dev; | |
1316 | dev->transport = transport; | |
c66ac9db NB |
1317 | INIT_LIST_HEAD(&dev->dev_list); |
1318 | INIT_LIST_HEAD(&dev->dev_sep_list); | |
1319 | INIT_LIST_HEAD(&dev->dev_tmr_list); | |
1320 | INIT_LIST_HEAD(&dev->execute_task_list); | |
1321 | INIT_LIST_HEAD(&dev->delayed_cmd_list); | |
c66ac9db | 1322 | INIT_LIST_HEAD(&dev->state_task_list); |
07bde79a | 1323 | INIT_LIST_HEAD(&dev->qf_cmd_list); |
c66ac9db NB |
1324 | spin_lock_init(&dev->execute_task_lock); |
1325 | spin_lock_init(&dev->delayed_cmd_lock); | |
c66ac9db NB |
1326 | spin_lock_init(&dev->dev_reservation_lock); |
1327 | spin_lock_init(&dev->dev_status_lock); | |
c66ac9db NB |
1328 | spin_lock_init(&dev->se_port_lock); |
1329 | spin_lock_init(&dev->se_tmr_lock); | |
07bde79a | 1330 | spin_lock_init(&dev->qf_cmd_lock); |
c66ac9db NB |
1331 | atomic_set(&dev->dev_ordered_id, 0); |
1332 | ||
1333 | se_dev_set_default_attribs(dev, dev_limits); | |
1334 | ||
1335 | dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX); | |
1336 | dev->creation_time = get_jiffies_64(); | |
1337 | spin_lock_init(&dev->stats_lock); | |
1338 | ||
1339 | spin_lock(&hba->device_lock); | |
1340 | list_add_tail(&dev->dev_list, &hba->hba_dev_list); | |
1341 | hba->dev_count++; | |
1342 | spin_unlock(&hba->device_lock); | |
1343 | /* | |
1344 | * Setup the SAM Task Attribute emulation for struct se_device | |
1345 | */ | |
1346 | core_setup_task_attr_emulation(dev); | |
1347 | /* | |
1348 | * Force PR and ALUA passthrough emulation with internal object use. | |
1349 | */ | |
1350 | force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE); | |
1351 | /* | |
1352 | * Setup the Reservations infrastructure for struct se_device | |
1353 | */ | |
1354 | core_setup_reservations(dev, force_pt); | |
1355 | /* | |
1356 | * Setup the Asymmetric Logical Unit Assignment for struct se_device | |
1357 | */ | |
1358 | if (core_setup_alua(dev, force_pt) < 0) | |
1359 | goto out; | |
1360 | ||
1361 | /* | |
1362 | * Startup the struct se_device processing thread | |
1363 | */ | |
1364 | dev->process_thread = kthread_run(transport_processing_thread, dev, | |
e3d6f909 | 1365 | "LIO_%s", dev->transport->name); |
c66ac9db | 1366 | if (IS_ERR(dev->process_thread)) { |
6708bb27 | 1367 | pr_err("Unable to create kthread: LIO_%s\n", |
e3d6f909 | 1368 | dev->transport->name); |
c66ac9db NB |
1369 | goto out; |
1370 | } | |
07bde79a NB |
1371 | /* |
1372 | * Setup work_queue for QUEUE_FULL | |
1373 | */ | |
1374 | INIT_WORK(&dev->qf_work_queue, target_qf_do_work); | |
c66ac9db NB |
1375 | /* |
1376 | * Preload the initial INQUIRY const values if we are doing | |
1377 | * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI | |
1378 | * passthrough because this is being provided by the backend LLD. | |
1379 | * This is required so that transport_get_inquiry() copies these | |
1380 | * originals once back into DEV_T10_WWN(dev) for the virtual device | |
1381 | * setup. | |
1382 | */ | |
e3d6f909 | 1383 | if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) { |
f22c1196 | 1384 | if (!inquiry_prod || !inquiry_rev) { |
6708bb27 | 1385 | pr_err("All non TCM/pSCSI plugins require" |
c66ac9db NB |
1386 | " INQUIRY consts\n"); |
1387 | goto out; | |
1388 | } | |
1389 | ||
e3d6f909 AG |
1390 | strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8); |
1391 | strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16); | |
1392 | strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4); | |
c66ac9db NB |
1393 | } |
1394 | scsi_dump_inquiry(dev); | |
1395 | ||
12a18bdc | 1396 | return dev; |
c66ac9db | 1397 | out: |
c66ac9db NB |
1398 | kthread_stop(dev->process_thread); |
1399 | ||
1400 | spin_lock(&hba->device_lock); | |
1401 | list_del(&dev->dev_list); | |
1402 | hba->dev_count--; | |
1403 | spin_unlock(&hba->device_lock); | |
1404 | ||
1405 | se_release_vpd_for_dev(dev); | |
1406 | ||
c66ac9db NB |
1407 | kfree(dev); |
1408 | ||
1409 | return NULL; | |
1410 | } | |
1411 | EXPORT_SYMBOL(transport_add_device_to_core_hba); | |
1412 | ||
1413 | /* transport_generic_prepare_cdb(): | |
1414 | * | |
1415 | * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will | |
1416 | * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2. | |
1417 | * The point of this is since we are mapping iSCSI LUNs to | |
1418 | * SCSI Target IDs having a non-zero LUN in the CDB will throw the | |
1419 | * devices and HBAs for a loop. | |
1420 | */ | |
1421 | static inline void transport_generic_prepare_cdb( | |
1422 | unsigned char *cdb) | |
1423 | { | |
1424 | switch (cdb[0]) { | |
1425 | case READ_10: /* SBC - RDProtect */ | |
1426 | case READ_12: /* SBC - RDProtect */ | |
1427 | case READ_16: /* SBC - RDProtect */ | |
1428 | case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */ | |
1429 | case VERIFY: /* SBC - VRProtect */ | |
1430 | case VERIFY_16: /* SBC - VRProtect */ | |
1431 | case WRITE_VERIFY: /* SBC - VRProtect */ | |
1432 | case WRITE_VERIFY_12: /* SBC - VRProtect */ | |
1433 | break; | |
1434 | default: | |
1435 | cdb[1] &= 0x1f; /* clear logical unit number */ | |
1436 | break; | |
1437 | } | |
1438 | } | |
1439 | ||
1440 | static struct se_task * | |
1441 | transport_generic_get_task(struct se_cmd *cmd, | |
1442 | enum dma_data_direction data_direction) | |
1443 | { | |
1444 | struct se_task *task; | |
5951146d | 1445 | struct se_device *dev = cmd->se_dev; |
c66ac9db | 1446 | |
6708bb27 | 1447 | task = dev->transport->alloc_task(cmd->t_task_cdb); |
c66ac9db | 1448 | if (!task) { |
6708bb27 | 1449 | pr_err("Unable to allocate struct se_task\n"); |
c66ac9db NB |
1450 | return NULL; |
1451 | } | |
1452 | ||
1453 | INIT_LIST_HEAD(&task->t_list); | |
1454 | INIT_LIST_HEAD(&task->t_execute_list); | |
1455 | INIT_LIST_HEAD(&task->t_state_list); | |
1456 | init_completion(&task->task_stop_comp); | |
c66ac9db | 1457 | task->task_se_cmd = cmd; |
c66ac9db NB |
1458 | task->task_data_direction = data_direction; |
1459 | ||
c66ac9db NB |
1460 | return task; |
1461 | } | |
1462 | ||
1463 | static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *); | |
1464 | ||
c66ac9db NB |
1465 | /* |
1466 | * Used by fabric modules containing a local struct se_cmd within their | |
1467 | * fabric dependent per I/O descriptor. | |
1468 | */ | |
1469 | void transport_init_se_cmd( | |
1470 | struct se_cmd *cmd, | |
1471 | struct target_core_fabric_ops *tfo, | |
1472 | struct se_session *se_sess, | |
1473 | u32 data_length, | |
1474 | int data_direction, | |
1475 | int task_attr, | |
1476 | unsigned char *sense_buffer) | |
1477 | { | |
5951146d AG |
1478 | INIT_LIST_HEAD(&cmd->se_lun_node); |
1479 | INIT_LIST_HEAD(&cmd->se_delayed_node); | |
07bde79a | 1480 | INIT_LIST_HEAD(&cmd->se_qf_node); |
79a7fef2 | 1481 | INIT_LIST_HEAD(&cmd->se_queue_node); |
a17f091d | 1482 | INIT_LIST_HEAD(&cmd->se_cmd_list); |
a1d8b49a AG |
1483 | INIT_LIST_HEAD(&cmd->t_task_list); |
1484 | init_completion(&cmd->transport_lun_fe_stop_comp); | |
1485 | init_completion(&cmd->transport_lun_stop_comp); | |
1486 | init_completion(&cmd->t_transport_stop_comp); | |
a17f091d | 1487 | init_completion(&cmd->cmd_wait_comp); |
a1d8b49a AG |
1488 | spin_lock_init(&cmd->t_state_lock); |
1489 | atomic_set(&cmd->transport_dev_active, 1); | |
c66ac9db NB |
1490 | |
1491 | cmd->se_tfo = tfo; | |
1492 | cmd->se_sess = se_sess; | |
1493 | cmd->data_length = data_length; | |
1494 | cmd->data_direction = data_direction; | |
1495 | cmd->sam_task_attr = task_attr; | |
1496 | cmd->sense_buffer = sense_buffer; | |
1497 | } | |
1498 | EXPORT_SYMBOL(transport_init_se_cmd); | |
1499 | ||
1500 | static int transport_check_alloc_task_attr(struct se_cmd *cmd) | |
1501 | { | |
1502 | /* | |
1503 | * Check if SAM Task Attribute emulation is enabled for this | |
1504 | * struct se_device storage object | |
1505 | */ | |
5951146d | 1506 | if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) |
c66ac9db NB |
1507 | return 0; |
1508 | ||
e66ecd50 | 1509 | if (cmd->sam_task_attr == MSG_ACA_TAG) { |
6708bb27 | 1510 | pr_debug("SAM Task Attribute ACA" |
c66ac9db | 1511 | " emulation is not supported\n"); |
e3d6f909 | 1512 | return -EINVAL; |
c66ac9db NB |
1513 | } |
1514 | /* | |
1515 | * Used to determine when ORDERED commands should go from | |
1516 | * Dormant to Active status. | |
1517 | */ | |
5951146d | 1518 | cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id); |
c66ac9db | 1519 | smp_mb__after_atomic_inc(); |
6708bb27 | 1520 | pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n", |
c66ac9db | 1521 | cmd->se_ordered_id, cmd->sam_task_attr, |
6708bb27 | 1522 | cmd->se_dev->transport->name); |
c66ac9db NB |
1523 | return 0; |
1524 | } | |
1525 | ||
c66ac9db NB |
1526 | /* transport_generic_allocate_tasks(): |
1527 | * | |
1528 | * Called from fabric RX Thread. | |
1529 | */ | |
1530 | int transport_generic_allocate_tasks( | |
1531 | struct se_cmd *cmd, | |
1532 | unsigned char *cdb) | |
1533 | { | |
1534 | int ret; | |
1535 | ||
1536 | transport_generic_prepare_cdb(cdb); | |
c66ac9db NB |
1537 | /* |
1538 | * Ensure that the received CDB is less than the max (252 + 8) bytes | |
1539 | * for VARIABLE_LENGTH_CMD | |
1540 | */ | |
1541 | if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) { | |
6708bb27 | 1542 | pr_err("Received SCSI CDB with command_size: %d that" |
c66ac9db NB |
1543 | " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n", |
1544 | scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE); | |
03e98c9e NB |
1545 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; |
1546 | cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; | |
e3d6f909 | 1547 | return -EINVAL; |
c66ac9db NB |
1548 | } |
1549 | /* | |
1550 | * If the received CDB is larger than TCM_MAX_COMMAND_SIZE, | |
1551 | * allocate the additional extended CDB buffer now.. Otherwise | |
1552 | * setup the pointer from __t_task_cdb to t_task_cdb. | |
1553 | */ | |
a1d8b49a AG |
1554 | if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) { |
1555 | cmd->t_task_cdb = kzalloc(scsi_command_size(cdb), | |
c66ac9db | 1556 | GFP_KERNEL); |
6708bb27 AG |
1557 | if (!cmd->t_task_cdb) { |
1558 | pr_err("Unable to allocate cmd->t_task_cdb" | |
a1d8b49a | 1559 | " %u > sizeof(cmd->__t_task_cdb): %lu ops\n", |
c66ac9db | 1560 | scsi_command_size(cdb), |
a1d8b49a | 1561 | (unsigned long)sizeof(cmd->__t_task_cdb)); |
03e98c9e NB |
1562 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; |
1563 | cmd->scsi_sense_reason = | |
1564 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
e3d6f909 | 1565 | return -ENOMEM; |
c66ac9db NB |
1566 | } |
1567 | } else | |
a1d8b49a | 1568 | cmd->t_task_cdb = &cmd->__t_task_cdb[0]; |
c66ac9db | 1569 | /* |
a1d8b49a | 1570 | * Copy the original CDB into cmd-> |
c66ac9db | 1571 | */ |
a1d8b49a | 1572 | memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb)); |
c66ac9db NB |
1573 | /* |
1574 | * Setup the received CDB based on SCSI defined opcodes and | |
1575 | * perform unit attention, persistent reservations and ALUA | |
a1d8b49a | 1576 | * checks for virtual device backends. The cmd->t_task_cdb |
c66ac9db NB |
1577 | * pointer is expected to be setup before we reach this point. |
1578 | */ | |
1579 | ret = transport_generic_cmd_sequencer(cmd, cdb); | |
1580 | if (ret < 0) | |
1581 | return ret; | |
1582 | /* | |
1583 | * Check for SAM Task Attribute Emulation | |
1584 | */ | |
1585 | if (transport_check_alloc_task_attr(cmd) < 0) { | |
1586 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
1587 | cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; | |
5951146d | 1588 | return -EINVAL; |
c66ac9db NB |
1589 | } |
1590 | spin_lock(&cmd->se_lun->lun_sep_lock); | |
1591 | if (cmd->se_lun->lun_sep) | |
1592 | cmd->se_lun->lun_sep->sep_stats.cmd_pdus++; | |
1593 | spin_unlock(&cmd->se_lun->lun_sep_lock); | |
1594 | return 0; | |
1595 | } | |
1596 | EXPORT_SYMBOL(transport_generic_allocate_tasks); | |
1597 | ||
695434e1 NB |
1598 | /* |
1599 | * Used by fabric module frontends to queue tasks directly. | |
1600 | * Many only be used from process context only | |
1601 | */ | |
1602 | int transport_handle_cdb_direct( | |
1603 | struct se_cmd *cmd) | |
1604 | { | |
dd8ae59d NB |
1605 | int ret; |
1606 | ||
695434e1 NB |
1607 | if (!cmd->se_lun) { |
1608 | dump_stack(); | |
6708bb27 | 1609 | pr_err("cmd->se_lun is NULL\n"); |
695434e1 NB |
1610 | return -EINVAL; |
1611 | } | |
1612 | if (in_interrupt()) { | |
1613 | dump_stack(); | |
6708bb27 | 1614 | pr_err("transport_generic_handle_cdb cannot be called" |
695434e1 NB |
1615 | " from interrupt context\n"); |
1616 | return -EINVAL; | |
1617 | } | |
dd8ae59d NB |
1618 | /* |
1619 | * Set TRANSPORT_NEW_CMD state and cmd->t_transport_active=1 following | |
1620 | * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue() | |
1621 | * in existing usage to ensure that outstanding descriptors are handled | |
d14921d6 | 1622 | * correctly during shutdown via transport_wait_for_tasks() |
dd8ae59d NB |
1623 | * |
1624 | * Also, we don't take cmd->t_state_lock here as we only expect | |
1625 | * this to be called for initial descriptor submission. | |
1626 | */ | |
1627 | cmd->t_state = TRANSPORT_NEW_CMD; | |
1628 | atomic_set(&cmd->t_transport_active, 1); | |
1629 | /* | |
1630 | * transport_generic_new_cmd() is already handling QUEUE_FULL, | |
1631 | * so follow TRANSPORT_NEW_CMD processing thread context usage | |
1632 | * and call transport_generic_request_failure() if necessary.. | |
1633 | */ | |
1634 | ret = transport_generic_new_cmd(cmd); | |
03e98c9e NB |
1635 | if (ret < 0) |
1636 | transport_generic_request_failure(cmd); | |
1637 | ||
dd8ae59d | 1638 | return 0; |
695434e1 NB |
1639 | } |
1640 | EXPORT_SYMBOL(transport_handle_cdb_direct); | |
1641 | ||
a6360785 NB |
1642 | /** |
1643 | * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd | |
1644 | * | |
1645 | * @se_cmd: command descriptor to submit | |
1646 | * @se_sess: associated se_sess for endpoint | |
1647 | * @cdb: pointer to SCSI CDB | |
1648 | * @sense: pointer to SCSI sense buffer | |
1649 | * @unpacked_lun: unpacked LUN to reference for struct se_lun | |
1650 | * @data_length: fabric expected data transfer length | |
1651 | * @task_addr: SAM task attribute | |
1652 | * @data_dir: DMA data direction | |
1653 | * @flags: flags for command submission from target_sc_flags_tables | |
1654 | * | |
1655 | * This may only be called from process context, and also currently | |
1656 | * assumes internal allocation of fabric payload buffer by target-core. | |
1657 | **/ | |
1658 | int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess, | |
1659 | unsigned char *cdb, unsigned char *sense, u32 unpacked_lun, | |
1660 | u32 data_length, int task_attr, int data_dir, int flags) | |
1661 | { | |
1662 | struct se_portal_group *se_tpg; | |
1663 | int rc; | |
1664 | ||
1665 | se_tpg = se_sess->se_tpg; | |
1666 | BUG_ON(!se_tpg); | |
1667 | BUG_ON(se_cmd->se_tfo || se_cmd->se_sess); | |
1668 | BUG_ON(in_interrupt()); | |
1669 | /* | |
1670 | * Initialize se_cmd for target operation. From this point | |
1671 | * exceptions are handled by sending exception status via | |
1672 | * target_core_fabric_ops->queue_status() callback | |
1673 | */ | |
1674 | transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, | |
1675 | data_length, data_dir, task_attr, sense); | |
1676 | /* | |
1677 | * Obtain struct se_cmd->cmd_kref reference and add new cmd to | |
1678 | * se_sess->sess_cmd_list. A second kref_get here is necessary | |
1679 | * for fabrics using TARGET_SCF_ACK_KREF that expect a second | |
1680 | * kref_put() to happen during fabric packet acknowledgement. | |
1681 | */ | |
1682 | target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF)); | |
1683 | /* | |
1684 | * Signal bidirectional data payloads to target-core | |
1685 | */ | |
1686 | if (flags & TARGET_SCF_BIDI_OP) | |
1687 | se_cmd->se_cmd_flags |= SCF_BIDI; | |
1688 | /* | |
1689 | * Locate se_lun pointer and attach it to struct se_cmd | |
1690 | */ | |
1691 | if (transport_lookup_cmd_lun(se_cmd, unpacked_lun) < 0) | |
1692 | goto out_check_cond; | |
1693 | /* | |
1694 | * Sanitize CDBs via transport_generic_cmd_sequencer() and | |
1695 | * allocate the necessary tasks to complete the received CDB+data | |
1696 | */ | |
1697 | rc = transport_generic_allocate_tasks(se_cmd, cdb); | |
1698 | if (rc != 0) | |
1699 | goto out_check_cond; | |
1700 | /* | |
1701 | * Dispatch se_cmd descriptor to se_lun->lun_se_dev backend | |
1702 | * for immediate execution of READs, otherwise wait for | |
1703 | * transport_generic_handle_data() to be called for WRITEs | |
1704 | * when fabric has filled the incoming buffer. | |
1705 | */ | |
1706 | transport_handle_cdb_direct(se_cmd); | |
1707 | return 0; | |
1708 | ||
1709 | out_check_cond: | |
1710 | transport_send_check_condition_and_sense(se_cmd, | |
1711 | se_cmd->scsi_sense_reason, 0); | |
1712 | return 0; | |
1713 | } | |
1714 | EXPORT_SYMBOL(target_submit_cmd); | |
1715 | ||
c66ac9db NB |
1716 | /* |
1717 | * Used by fabric module frontends defining a TFO->new_cmd_map() caller | |
1718 | * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to | |
1719 | * complete setup in TCM process context w/ TFO->new_cmd_map(). | |
1720 | */ | |
1721 | int transport_generic_handle_cdb_map( | |
1722 | struct se_cmd *cmd) | |
1723 | { | |
e3d6f909 | 1724 | if (!cmd->se_lun) { |
c66ac9db | 1725 | dump_stack(); |
6708bb27 | 1726 | pr_err("cmd->se_lun is NULL\n"); |
e3d6f909 | 1727 | return -EINVAL; |
c66ac9db NB |
1728 | } |
1729 | ||
f7a5cc0b | 1730 | transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP, false); |
c66ac9db NB |
1731 | return 0; |
1732 | } | |
1733 | EXPORT_SYMBOL(transport_generic_handle_cdb_map); | |
1734 | ||
1735 | /* transport_generic_handle_data(): | |
1736 | * | |
1737 | * | |
1738 | */ | |
1739 | int transport_generic_handle_data( | |
1740 | struct se_cmd *cmd) | |
1741 | { | |
1742 | /* | |
1743 | * For the software fabric case, then we assume the nexus is being | |
1744 | * failed/shutdown when signals are pending from the kthread context | |
1745 | * caller, so we return a failure. For the HW target mode case running | |
1746 | * in interrupt code, the signal_pending() check is skipped. | |
1747 | */ | |
1748 | if (!in_interrupt() && signal_pending(current)) | |
e3d6f909 | 1749 | return -EPERM; |
c66ac9db NB |
1750 | /* |
1751 | * If the received CDB has aleady been ABORTED by the generic | |
1752 | * target engine, we now call transport_check_aborted_status() | |
1753 | * to queue any delated TASK_ABORTED status for the received CDB to the | |
25985edc | 1754 | * fabric module as we are expecting no further incoming DATA OUT |
c66ac9db NB |
1755 | * sequences at this point. |
1756 | */ | |
1757 | if (transport_check_aborted_status(cmd, 1) != 0) | |
1758 | return 0; | |
1759 | ||
f7a5cc0b | 1760 | transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE, false); |
c66ac9db NB |
1761 | return 0; |
1762 | } | |
1763 | EXPORT_SYMBOL(transport_generic_handle_data); | |
1764 | ||
1765 | /* transport_generic_handle_tmr(): | |
1766 | * | |
1767 | * | |
1768 | */ | |
1769 | int transport_generic_handle_tmr( | |
1770 | struct se_cmd *cmd) | |
1771 | { | |
f7a5cc0b | 1772 | transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR, false); |
c66ac9db NB |
1773 | return 0; |
1774 | } | |
1775 | EXPORT_SYMBOL(transport_generic_handle_tmr); | |
1776 | ||
cdbb70bb CH |
1777 | /* |
1778 | * If the task is active, request it to be stopped and sleep until it | |
1779 | * has completed. | |
1780 | */ | |
1781 | bool target_stop_task(struct se_task *task, unsigned long *flags) | |
1782 | { | |
1783 | struct se_cmd *cmd = task->task_se_cmd; | |
1784 | bool was_active = false; | |
1785 | ||
1786 | if (task->task_flags & TF_ACTIVE) { | |
1787 | task->task_flags |= TF_REQUEST_STOP; | |
1788 | spin_unlock_irqrestore(&cmd->t_state_lock, *flags); | |
1789 | ||
1790 | pr_debug("Task %p waiting to complete\n", task); | |
1791 | wait_for_completion(&task->task_stop_comp); | |
1792 | pr_debug("Task %p stopped successfully\n", task); | |
1793 | ||
1794 | spin_lock_irqsave(&cmd->t_state_lock, *flags); | |
1795 | atomic_dec(&cmd->t_task_cdbs_left); | |
1796 | task->task_flags &= ~(TF_ACTIVE | TF_REQUEST_STOP); | |
1797 | was_active = true; | |
1798 | } | |
1799 | ||
cdbb70bb CH |
1800 | return was_active; |
1801 | } | |
1802 | ||
c66ac9db NB |
1803 | static int transport_stop_tasks_for_cmd(struct se_cmd *cmd) |
1804 | { | |
1805 | struct se_task *task, *task_tmp; | |
1806 | unsigned long flags; | |
1807 | int ret = 0; | |
1808 | ||
6708bb27 | 1809 | pr_debug("ITT[0x%08x] - Stopping tasks\n", |
e3d6f909 | 1810 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db NB |
1811 | |
1812 | /* | |
1813 | * No tasks remain in the execution queue | |
1814 | */ | |
a1d8b49a | 1815 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 1816 | list_for_each_entry_safe(task, task_tmp, |
a1d8b49a | 1817 | &cmd->t_task_list, t_list) { |
04629b7b | 1818 | pr_debug("Processing task %p\n", task); |
c66ac9db NB |
1819 | /* |
1820 | * If the struct se_task has not been sent and is not active, | |
1821 | * remove the struct se_task from the execution queue. | |
1822 | */ | |
6c76bf95 | 1823 | if (!(task->task_flags & (TF_ACTIVE | TF_SENT))) { |
a1d8b49a | 1824 | spin_unlock_irqrestore(&cmd->t_state_lock, |
c66ac9db NB |
1825 | flags); |
1826 | transport_remove_task_from_execute_queue(task, | |
42bf829e | 1827 | cmd->se_dev); |
c66ac9db | 1828 | |
04629b7b | 1829 | pr_debug("Task %p removed from execute queue\n", task); |
a1d8b49a | 1830 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db NB |
1831 | continue; |
1832 | } | |
1833 | ||
cdbb70bb | 1834 | if (!target_stop_task(task, &flags)) { |
04629b7b | 1835 | pr_debug("Task %p - did nothing\n", task); |
c66ac9db NB |
1836 | ret++; |
1837 | } | |
c66ac9db | 1838 | } |
a1d8b49a | 1839 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
1840 | |
1841 | return ret; | |
1842 | } | |
1843 | ||
c66ac9db NB |
1844 | /* |
1845 | * Handle SAM-esque emulation for generic transport request failures. | |
1846 | */ | |
03e98c9e | 1847 | static void transport_generic_request_failure(struct se_cmd *cmd) |
c66ac9db | 1848 | { |
07bde79a NB |
1849 | int ret = 0; |
1850 | ||
6708bb27 | 1851 | pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x" |
e3d6f909 | 1852 | " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd), |
a1d8b49a | 1853 | cmd->t_task_cdb[0]); |
03e98c9e | 1854 | pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n", |
e3d6f909 | 1855 | cmd->se_tfo->get_cmd_state(cmd), |
03e98c9e | 1856 | cmd->t_state, cmd->scsi_sense_reason); |
6708bb27 | 1857 | pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d" |
c66ac9db NB |
1858 | " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --" |
1859 | " t_transport_active: %d t_transport_stop: %d" | |
6708bb27 | 1860 | " t_transport_sent: %d\n", cmd->t_task_list_num, |
a1d8b49a AG |
1861 | atomic_read(&cmd->t_task_cdbs_left), |
1862 | atomic_read(&cmd->t_task_cdbs_sent), | |
1863 | atomic_read(&cmd->t_task_cdbs_ex_left), | |
1864 | atomic_read(&cmd->t_transport_active), | |
1865 | atomic_read(&cmd->t_transport_stop), | |
1866 | atomic_read(&cmd->t_transport_sent)); | |
c66ac9db | 1867 | |
c66ac9db NB |
1868 | /* |
1869 | * For SAM Task Attribute emulation for failed struct se_cmd | |
1870 | */ | |
1871 | if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) | |
1872 | transport_complete_task_attr(cmd); | |
1873 | ||
03e98c9e NB |
1874 | switch (cmd->scsi_sense_reason) { |
1875 | case TCM_NON_EXISTENT_LUN: | |
1876 | case TCM_UNSUPPORTED_SCSI_OPCODE: | |
1877 | case TCM_INVALID_CDB_FIELD: | |
1878 | case TCM_INVALID_PARAMETER_LIST: | |
1879 | case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE: | |
1880 | case TCM_UNKNOWN_MODE_PAGE: | |
1881 | case TCM_WRITE_PROTECTED: | |
1882 | case TCM_CHECK_CONDITION_ABORT_CMD: | |
1883 | case TCM_CHECK_CONDITION_UNIT_ATTENTION: | |
1884 | case TCM_CHECK_CONDITION_NOT_READY: | |
c66ac9db | 1885 | break; |
03e98c9e | 1886 | case TCM_RESERVATION_CONFLICT: |
c66ac9db NB |
1887 | /* |
1888 | * No SENSE Data payload for this case, set SCSI Status | |
1889 | * and queue the response to $FABRIC_MOD. | |
1890 | * | |
1891 | * Uses linux/include/scsi/scsi.h SAM status codes defs | |
1892 | */ | |
1893 | cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT; | |
1894 | /* | |
1895 | * For UA Interlock Code 11b, a RESERVATION CONFLICT will | |
1896 | * establish a UNIT ATTENTION with PREVIOUS RESERVATION | |
1897 | * CONFLICT STATUS. | |
1898 | * | |
1899 | * See spc4r17, section 7.4.6 Control Mode Page, Table 349 | |
1900 | */ | |
e3d6f909 AG |
1901 | if (cmd->se_sess && |
1902 | cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2) | |
1903 | core_scsi3_ua_allocate(cmd->se_sess->se_node_acl, | |
c66ac9db NB |
1904 | cmd->orig_fe_lun, 0x2C, |
1905 | ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS); | |
1906 | ||
07bde79a | 1907 | ret = cmd->se_tfo->queue_status(cmd); |
f147abb4 | 1908 | if (ret == -EAGAIN || ret == -ENOMEM) |
07bde79a | 1909 | goto queue_full; |
c66ac9db | 1910 | goto check_stop; |
c66ac9db | 1911 | default: |
6708bb27 | 1912 | pr_err("Unknown transport error for CDB 0x%02x: %d\n", |
03e98c9e | 1913 | cmd->t_task_cdb[0], cmd->scsi_sense_reason); |
c66ac9db NB |
1914 | cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; |
1915 | break; | |
1916 | } | |
16ab8e60 NB |
1917 | /* |
1918 | * If a fabric does not define a cmd->se_tfo->new_cmd_map caller, | |
1919 | * make the call to transport_send_check_condition_and_sense() | |
1920 | * directly. Otherwise expect the fabric to make the call to | |
1921 | * transport_send_check_condition_and_sense() after handling | |
1922 | * possible unsoliticied write data payloads. | |
1923 | */ | |
03e98c9e NB |
1924 | ret = transport_send_check_condition_and_sense(cmd, |
1925 | cmd->scsi_sense_reason, 0); | |
1926 | if (ret == -EAGAIN || ret == -ENOMEM) | |
1927 | goto queue_full; | |
07bde79a | 1928 | |
c66ac9db NB |
1929 | check_stop: |
1930 | transport_lun_remove_cmd(cmd); | |
6708bb27 | 1931 | if (!transport_cmd_check_stop_to_fabric(cmd)) |
c66ac9db | 1932 | ; |
07bde79a NB |
1933 | return; |
1934 | ||
1935 | queue_full: | |
e057f533 CH |
1936 | cmd->t_state = TRANSPORT_COMPLETE_QF_OK; |
1937 | transport_handle_queue_full(cmd, cmd->se_dev); | |
c66ac9db NB |
1938 | } |
1939 | ||
c66ac9db NB |
1940 | static inline u32 transport_lba_21(unsigned char *cdb) |
1941 | { | |
1942 | return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3]; | |
1943 | } | |
1944 | ||
1945 | static inline u32 transport_lba_32(unsigned char *cdb) | |
1946 | { | |
1947 | return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; | |
1948 | } | |
1949 | ||
1950 | static inline unsigned long long transport_lba_64(unsigned char *cdb) | |
1951 | { | |
1952 | unsigned int __v1, __v2; | |
1953 | ||
1954 | __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; | |
1955 | __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; | |
1956 | ||
1957 | return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; | |
1958 | } | |
1959 | ||
1960 | /* | |
1961 | * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs | |
1962 | */ | |
1963 | static inline unsigned long long transport_lba_64_ext(unsigned char *cdb) | |
1964 | { | |
1965 | unsigned int __v1, __v2; | |
1966 | ||
1967 | __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15]; | |
1968 | __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19]; | |
1969 | ||
1970 | return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; | |
1971 | } | |
1972 | ||
1973 | static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd) | |
1974 | { | |
1975 | unsigned long flags; | |
1976 | ||
a1d8b49a | 1977 | spin_lock_irqsave(&se_cmd->t_state_lock, flags); |
c66ac9db | 1978 | se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE; |
a1d8b49a | 1979 | spin_unlock_irqrestore(&se_cmd->t_state_lock, flags); |
c66ac9db NB |
1980 | } |
1981 | ||
c66ac9db NB |
1982 | /* |
1983 | * Called from Fabric Module context from transport_execute_tasks() | |
1984 | * | |
1985 | * The return of this function determins if the tasks from struct se_cmd | |
1986 | * get added to the execution queue in transport_execute_tasks(), | |
1987 | * or are added to the delayed or ordered lists here. | |
1988 | */ | |
1989 | static inline int transport_execute_task_attr(struct se_cmd *cmd) | |
1990 | { | |
5951146d | 1991 | if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) |
c66ac9db NB |
1992 | return 1; |
1993 | /* | |
25985edc | 1994 | * Check for the existence of HEAD_OF_QUEUE, and if true return 1 |
c66ac9db NB |
1995 | * to allow the passed struct se_cmd list of tasks to the front of the list. |
1996 | */ | |
e66ecd50 | 1997 | if (cmd->sam_task_attr == MSG_HEAD_TAG) { |
6708bb27 | 1998 | pr_debug("Added HEAD_OF_QUEUE for CDB:" |
c66ac9db | 1999 | " 0x%02x, se_ordered_id: %u\n", |
6708bb27 | 2000 | cmd->t_task_cdb[0], |
c66ac9db NB |
2001 | cmd->se_ordered_id); |
2002 | return 1; | |
e66ecd50 | 2003 | } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) { |
5951146d | 2004 | atomic_inc(&cmd->se_dev->dev_ordered_sync); |
c66ac9db NB |
2005 | smp_mb__after_atomic_inc(); |
2006 | ||
6708bb27 | 2007 | pr_debug("Added ORDERED for CDB: 0x%02x to ordered" |
c66ac9db | 2008 | " list, se_ordered_id: %u\n", |
a1d8b49a | 2009 | cmd->t_task_cdb[0], |
c66ac9db NB |
2010 | cmd->se_ordered_id); |
2011 | /* | |
2012 | * Add ORDERED command to tail of execution queue if | |
2013 | * no other older commands exist that need to be | |
2014 | * completed first. | |
2015 | */ | |
6708bb27 | 2016 | if (!atomic_read(&cmd->se_dev->simple_cmds)) |
c66ac9db NB |
2017 | return 1; |
2018 | } else { | |
2019 | /* | |
2020 | * For SIMPLE and UNTAGGED Task Attribute commands | |
2021 | */ | |
5951146d | 2022 | atomic_inc(&cmd->se_dev->simple_cmds); |
c66ac9db NB |
2023 | smp_mb__after_atomic_inc(); |
2024 | } | |
2025 | /* | |
2026 | * Otherwise if one or more outstanding ORDERED task attribute exist, | |
2027 | * add the dormant task(s) built for the passed struct se_cmd to the | |
2028 | * execution queue and become in Active state for this struct se_device. | |
2029 | */ | |
5951146d | 2030 | if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) { |
c66ac9db NB |
2031 | /* |
2032 | * Otherwise, add cmd w/ tasks to delayed cmd queue that | |
25985edc | 2033 | * will be drained upon completion of HEAD_OF_QUEUE task. |
c66ac9db | 2034 | */ |
5951146d | 2035 | spin_lock(&cmd->se_dev->delayed_cmd_lock); |
c66ac9db | 2036 | cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR; |
5951146d AG |
2037 | list_add_tail(&cmd->se_delayed_node, |
2038 | &cmd->se_dev->delayed_cmd_list); | |
2039 | spin_unlock(&cmd->se_dev->delayed_cmd_lock); | |
c66ac9db | 2040 | |
6708bb27 | 2041 | pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to" |
c66ac9db | 2042 | " delayed CMD list, se_ordered_id: %u\n", |
a1d8b49a | 2043 | cmd->t_task_cdb[0], cmd->sam_task_attr, |
c66ac9db NB |
2044 | cmd->se_ordered_id); |
2045 | /* | |
2046 | * Return zero to let transport_execute_tasks() know | |
2047 | * not to add the delayed tasks to the execution list. | |
2048 | */ | |
2049 | return 0; | |
2050 | } | |
2051 | /* | |
2052 | * Otherwise, no ORDERED task attributes exist.. | |
2053 | */ | |
2054 | return 1; | |
2055 | } | |
2056 | ||
2057 | /* | |
2058 | * Called from fabric module context in transport_generic_new_cmd() and | |
2059 | * transport_generic_process_write() | |
2060 | */ | |
2061 | static int transport_execute_tasks(struct se_cmd *cmd) | |
2062 | { | |
2063 | int add_tasks; | |
40be67f4 | 2064 | struct se_device *se_dev = cmd->se_dev; |
c66ac9db NB |
2065 | /* |
2066 | * Call transport_cmd_check_stop() to see if a fabric exception | |
25985edc | 2067 | * has occurred that prevents execution. |
c66ac9db | 2068 | */ |
6708bb27 | 2069 | if (!transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING)) { |
c66ac9db NB |
2070 | /* |
2071 | * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE | |
2072 | * attribute for the tasks of the received struct se_cmd CDB | |
2073 | */ | |
2074 | add_tasks = transport_execute_task_attr(cmd); | |
e3d6f909 | 2075 | if (!add_tasks) |
c66ac9db NB |
2076 | goto execute_tasks; |
2077 | /* | |
4d2300cc NB |
2078 | * __transport_execute_tasks() -> __transport_add_tasks_from_cmd() |
2079 | * adds associated se_tasks while holding dev->execute_task_lock | |
2080 | * before I/O dispath to avoid a double spinlock access. | |
c66ac9db | 2081 | */ |
4d2300cc NB |
2082 | __transport_execute_tasks(se_dev, cmd); |
2083 | return 0; | |
c66ac9db | 2084 | } |
4d2300cc | 2085 | |
c66ac9db | 2086 | execute_tasks: |
4d2300cc | 2087 | __transport_execute_tasks(se_dev, NULL); |
c66ac9db NB |
2088 | return 0; |
2089 | } | |
2090 | ||
2091 | /* | |
2092 | * Called to check struct se_device tcq depth window, and once open pull struct se_task | |
2093 | * from struct se_device->execute_task_list and | |
2094 | * | |
2095 | * Called from transport_processing_thread() | |
2096 | */ | |
4d2300cc | 2097 | static int __transport_execute_tasks(struct se_device *dev, struct se_cmd *new_cmd) |
c66ac9db NB |
2098 | { |
2099 | int error; | |
2100 | struct se_cmd *cmd = NULL; | |
e3d6f909 | 2101 | struct se_task *task = NULL; |
c66ac9db NB |
2102 | unsigned long flags; |
2103 | ||
c66ac9db | 2104 | check_depth: |
e3d6f909 | 2105 | spin_lock_irq(&dev->execute_task_lock); |
4d2300cc NB |
2106 | if (new_cmd != NULL) |
2107 | __transport_add_tasks_from_cmd(new_cmd); | |
2108 | ||
e3d6f909 AG |
2109 | if (list_empty(&dev->execute_task_list)) { |
2110 | spin_unlock_irq(&dev->execute_task_lock); | |
c66ac9db NB |
2111 | return 0; |
2112 | } | |
e3d6f909 AG |
2113 | task = list_first_entry(&dev->execute_task_list, |
2114 | struct se_task, t_execute_list); | |
04629b7b | 2115 | __transport_remove_task_from_execute_queue(task, dev); |
e3d6f909 | 2116 | spin_unlock_irq(&dev->execute_task_lock); |
c66ac9db | 2117 | |
e3d6f909 | 2118 | cmd = task->task_se_cmd; |
a1d8b49a | 2119 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
6c76bf95 | 2120 | task->task_flags |= (TF_ACTIVE | TF_SENT); |
a1d8b49a | 2121 | atomic_inc(&cmd->t_task_cdbs_sent); |
c66ac9db | 2122 | |
a1d8b49a AG |
2123 | if (atomic_read(&cmd->t_task_cdbs_sent) == |
2124 | cmd->t_task_list_num) | |
415a090a | 2125 | atomic_set(&cmd->t_transport_sent, 1); |
c66ac9db | 2126 | |
a1d8b49a | 2127 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 2128 | |
5bda90c8 CH |
2129 | if (cmd->execute_task) |
2130 | error = cmd->execute_task(task); | |
2131 | else | |
2132 | error = dev->transport->do_task(task); | |
d29a5b6a | 2133 | if (error != 0) { |
d29a5b6a CH |
2134 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
2135 | task->task_flags &= ~TF_ACTIVE; | |
2136 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
2137 | atomic_set(&cmd->t_transport_sent, 0); | |
2138 | transport_stop_tasks_for_cmd(cmd); | |
03e98c9e | 2139 | transport_generic_request_failure(cmd); |
c66ac9db NB |
2140 | } |
2141 | ||
4d2300cc | 2142 | new_cmd = NULL; |
c66ac9db NB |
2143 | goto check_depth; |
2144 | ||
2145 | return 0; | |
2146 | } | |
2147 | ||
c66ac9db NB |
2148 | static inline u32 transport_get_sectors_6( |
2149 | unsigned char *cdb, | |
2150 | struct se_cmd *cmd, | |
2151 | int *ret) | |
2152 | { | |
5951146d | 2153 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
2154 | |
2155 | /* | |
2156 | * Assume TYPE_DISK for non struct se_device objects. | |
2157 | * Use 8-bit sector value. | |
2158 | */ | |
2159 | if (!dev) | |
2160 | goto type_disk; | |
2161 | ||
2162 | /* | |
2163 | * Use 24-bit allocation length for TYPE_TAPE. | |
2164 | */ | |
e3d6f909 | 2165 | if (dev->transport->get_device_type(dev) == TYPE_TAPE) |
c66ac9db NB |
2166 | return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4]; |
2167 | ||
2168 | /* | |
2169 | * Everything else assume TYPE_DISK Sector CDB location. | |
9b5cd7f3 RD |
2170 | * Use 8-bit sector value. SBC-3 says: |
2171 | * | |
2172 | * A TRANSFER LENGTH field set to zero specifies that 256 | |
2173 | * logical blocks shall be written. Any other value | |
2174 | * specifies the number of logical blocks that shall be | |
2175 | * written. | |
c66ac9db NB |
2176 | */ |
2177 | type_disk: | |
9b5cd7f3 | 2178 | return cdb[4] ? : 256; |
c66ac9db NB |
2179 | } |
2180 | ||
2181 | static inline u32 transport_get_sectors_10( | |
2182 | unsigned char *cdb, | |
2183 | struct se_cmd *cmd, | |
2184 | int *ret) | |
2185 | { | |
5951146d | 2186 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
2187 | |
2188 | /* | |
2189 | * Assume TYPE_DISK for non struct se_device objects. | |
2190 | * Use 16-bit sector value. | |
2191 | */ | |
2192 | if (!dev) | |
2193 | goto type_disk; | |
2194 | ||
2195 | /* | |
2196 | * XXX_10 is not defined in SSC, throw an exception | |
2197 | */ | |
e3d6f909 AG |
2198 | if (dev->transport->get_device_type(dev) == TYPE_TAPE) { |
2199 | *ret = -EINVAL; | |
c66ac9db NB |
2200 | return 0; |
2201 | } | |
2202 | ||
2203 | /* | |
2204 | * Everything else assume TYPE_DISK Sector CDB location. | |
2205 | * Use 16-bit sector value. | |
2206 | */ | |
2207 | type_disk: | |
2208 | return (u32)(cdb[7] << 8) + cdb[8]; | |
2209 | } | |
2210 | ||
2211 | static inline u32 transport_get_sectors_12( | |
2212 | unsigned char *cdb, | |
2213 | struct se_cmd *cmd, | |
2214 | int *ret) | |
2215 | { | |
5951146d | 2216 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
2217 | |
2218 | /* | |
2219 | * Assume TYPE_DISK for non struct se_device objects. | |
2220 | * Use 32-bit sector value. | |
2221 | */ | |
2222 | if (!dev) | |
2223 | goto type_disk; | |
2224 | ||
2225 | /* | |
2226 | * XXX_12 is not defined in SSC, throw an exception | |
2227 | */ | |
e3d6f909 AG |
2228 | if (dev->transport->get_device_type(dev) == TYPE_TAPE) { |
2229 | *ret = -EINVAL; | |
c66ac9db NB |
2230 | return 0; |
2231 | } | |
2232 | ||
2233 | /* | |
2234 | * Everything else assume TYPE_DISK Sector CDB location. | |
2235 | * Use 32-bit sector value. | |
2236 | */ | |
2237 | type_disk: | |
2238 | return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9]; | |
2239 | } | |
2240 | ||
2241 | static inline u32 transport_get_sectors_16( | |
2242 | unsigned char *cdb, | |
2243 | struct se_cmd *cmd, | |
2244 | int *ret) | |
2245 | { | |
5951146d | 2246 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
2247 | |
2248 | /* | |
2249 | * Assume TYPE_DISK for non struct se_device objects. | |
2250 | * Use 32-bit sector value. | |
2251 | */ | |
2252 | if (!dev) | |
2253 | goto type_disk; | |
2254 | ||
2255 | /* | |
2256 | * Use 24-bit allocation length for TYPE_TAPE. | |
2257 | */ | |
e3d6f909 | 2258 | if (dev->transport->get_device_type(dev) == TYPE_TAPE) |
c66ac9db NB |
2259 | return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14]; |
2260 | ||
2261 | type_disk: | |
2262 | return (u32)(cdb[10] << 24) + (cdb[11] << 16) + | |
2263 | (cdb[12] << 8) + cdb[13]; | |
2264 | } | |
2265 | ||
2266 | /* | |
2267 | * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants | |
2268 | */ | |
2269 | static inline u32 transport_get_sectors_32( | |
2270 | unsigned char *cdb, | |
2271 | struct se_cmd *cmd, | |
2272 | int *ret) | |
2273 | { | |
2274 | /* | |
2275 | * Assume TYPE_DISK for non struct se_device objects. | |
2276 | * Use 32-bit sector value. | |
2277 | */ | |
2278 | return (u32)(cdb[28] << 24) + (cdb[29] << 16) + | |
2279 | (cdb[30] << 8) + cdb[31]; | |
2280 | ||
2281 | } | |
2282 | ||
2283 | static inline u32 transport_get_size( | |
2284 | u32 sectors, | |
2285 | unsigned char *cdb, | |
2286 | struct se_cmd *cmd) | |
2287 | { | |
5951146d | 2288 | struct se_device *dev = cmd->se_dev; |
c66ac9db | 2289 | |
e3d6f909 | 2290 | if (dev->transport->get_device_type(dev) == TYPE_TAPE) { |
c66ac9db | 2291 | if (cdb[1] & 1) { /* sectors */ |
e3d6f909 | 2292 | return dev->se_sub_dev->se_dev_attrib.block_size * sectors; |
c66ac9db NB |
2293 | } else /* bytes */ |
2294 | return sectors; | |
2295 | } | |
2296 | #if 0 | |
6708bb27 | 2297 | pr_debug("Returning block_size: %u, sectors: %u == %u for" |
e3d6f909 AG |
2298 | " %s object\n", dev->se_sub_dev->se_dev_attrib.block_size, sectors, |
2299 | dev->se_sub_dev->se_dev_attrib.block_size * sectors, | |
2300 | dev->transport->name); | |
c66ac9db | 2301 | #endif |
e3d6f909 | 2302 | return dev->se_sub_dev->se_dev_attrib.block_size * sectors; |
c66ac9db NB |
2303 | } |
2304 | ||
c66ac9db NB |
2305 | static void transport_xor_callback(struct se_cmd *cmd) |
2306 | { | |
2307 | unsigned char *buf, *addr; | |
ec98f782 | 2308 | struct scatterlist *sg; |
c66ac9db NB |
2309 | unsigned int offset; |
2310 | int i; | |
ec98f782 | 2311 | int count; |
c66ac9db NB |
2312 | /* |
2313 | * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command | |
2314 | * | |
2315 | * 1) read the specified logical block(s); | |
2316 | * 2) transfer logical blocks from the data-out buffer; | |
2317 | * 3) XOR the logical blocks transferred from the data-out buffer with | |
2318 | * the logical blocks read, storing the resulting XOR data in a buffer; | |
2319 | * 4) if the DISABLE WRITE bit is set to zero, then write the logical | |
2320 | * blocks transferred from the data-out buffer; and | |
2321 | * 5) transfer the resulting XOR data to the data-in buffer. | |
2322 | */ | |
2323 | buf = kmalloc(cmd->data_length, GFP_KERNEL); | |
6708bb27 AG |
2324 | if (!buf) { |
2325 | pr_err("Unable to allocate xor_callback buf\n"); | |
c66ac9db NB |
2326 | return; |
2327 | } | |
2328 | /* | |
ec98f782 | 2329 | * Copy the scatterlist WRITE buffer located at cmd->t_data_sg |
c66ac9db NB |
2330 | * into the locally allocated *buf |
2331 | */ | |
ec98f782 AG |
2332 | sg_copy_to_buffer(cmd->t_data_sg, |
2333 | cmd->t_data_nents, | |
2334 | buf, | |
2335 | cmd->data_length); | |
2336 | ||
c66ac9db NB |
2337 | /* |
2338 | * Now perform the XOR against the BIDI read memory located at | |
a1d8b49a | 2339 | * cmd->t_mem_bidi_list |
c66ac9db NB |
2340 | */ |
2341 | ||
2342 | offset = 0; | |
ec98f782 AG |
2343 | for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) { |
2344 | addr = kmap_atomic(sg_page(sg), KM_USER0); | |
2345 | if (!addr) | |
c66ac9db NB |
2346 | goto out; |
2347 | ||
ec98f782 AG |
2348 | for (i = 0; i < sg->length; i++) |
2349 | *(addr + sg->offset + i) ^= *(buf + offset + i); | |
c66ac9db | 2350 | |
ec98f782 | 2351 | offset += sg->length; |
c66ac9db NB |
2352 | kunmap_atomic(addr, KM_USER0); |
2353 | } | |
ec98f782 | 2354 | |
c66ac9db NB |
2355 | out: |
2356 | kfree(buf); | |
2357 | } | |
2358 | ||
2359 | /* | |
2360 | * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd | |
2361 | */ | |
2362 | static int transport_get_sense_data(struct se_cmd *cmd) | |
2363 | { | |
2364 | unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL; | |
42bf829e | 2365 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
2366 | struct se_task *task = NULL, *task_tmp; |
2367 | unsigned long flags; | |
2368 | u32 offset = 0; | |
2369 | ||
e3d6f909 AG |
2370 | WARN_ON(!cmd->se_lun); |
2371 | ||
42bf829e CH |
2372 | if (!dev) |
2373 | return 0; | |
2374 | ||
a1d8b49a | 2375 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 2376 | if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) { |
a1d8b49a | 2377 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
2378 | return 0; |
2379 | } | |
2380 | ||
2381 | list_for_each_entry_safe(task, task_tmp, | |
a1d8b49a | 2382 | &cmd->t_task_list, t_list) { |
ef804a84 | 2383 | if (!(task->task_flags & TF_HAS_SENSE)) |
c66ac9db NB |
2384 | continue; |
2385 | ||
e3d6f909 | 2386 | if (!dev->transport->get_sense_buffer) { |
6708bb27 | 2387 | pr_err("dev->transport->get_sense_buffer" |
c66ac9db NB |
2388 | " is NULL\n"); |
2389 | continue; | |
2390 | } | |
2391 | ||
e3d6f909 | 2392 | sense_buffer = dev->transport->get_sense_buffer(task); |
6708bb27 | 2393 | if (!sense_buffer) { |
04629b7b | 2394 | pr_err("ITT[0x%08x]_TASK[%p]: Unable to locate" |
c66ac9db | 2395 | " sense buffer for task with sense\n", |
04629b7b | 2396 | cmd->se_tfo->get_task_tag(cmd), task); |
c66ac9db NB |
2397 | continue; |
2398 | } | |
a1d8b49a | 2399 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 2400 | |
e3d6f909 | 2401 | offset = cmd->se_tfo->set_fabric_sense_len(cmd, |
c66ac9db NB |
2402 | TRANSPORT_SENSE_BUFFER); |
2403 | ||
5951146d | 2404 | memcpy(&buffer[offset], sense_buffer, |
c66ac9db NB |
2405 | TRANSPORT_SENSE_BUFFER); |
2406 | cmd->scsi_status = task->task_scsi_status; | |
2407 | /* Automatically padded */ | |
2408 | cmd->scsi_sense_length = | |
2409 | (TRANSPORT_SENSE_BUFFER + offset); | |
2410 | ||
6708bb27 | 2411 | pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x" |
c66ac9db | 2412 | " and sense\n", |
e3d6f909 | 2413 | dev->se_hba->hba_id, dev->transport->name, |
c66ac9db NB |
2414 | cmd->scsi_status); |
2415 | return 0; | |
2416 | } | |
a1d8b49a | 2417 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
2418 | |
2419 | return -1; | |
2420 | } | |
2421 | ||
ec98f782 AG |
2422 | static inline long long transport_dev_end_lba(struct se_device *dev) |
2423 | { | |
2424 | return dev->transport->get_blocks(dev) + 1; | |
2425 | } | |
2426 | ||
2427 | static int transport_cmd_get_valid_sectors(struct se_cmd *cmd) | |
2428 | { | |
2429 | struct se_device *dev = cmd->se_dev; | |
2430 | u32 sectors; | |
2431 | ||
2432 | if (dev->transport->get_device_type(dev) != TYPE_DISK) | |
2433 | return 0; | |
2434 | ||
2435 | sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size); | |
2436 | ||
6708bb27 AG |
2437 | if ((cmd->t_task_lba + sectors) > transport_dev_end_lba(dev)) { |
2438 | pr_err("LBA: %llu Sectors: %u exceeds" | |
ec98f782 AG |
2439 | " transport_dev_end_lba(): %llu\n", |
2440 | cmd->t_task_lba, sectors, | |
2441 | transport_dev_end_lba(dev)); | |
7abbe7f3 | 2442 | return -EINVAL; |
ec98f782 AG |
2443 | } |
2444 | ||
7abbe7f3 | 2445 | return 0; |
ec98f782 AG |
2446 | } |
2447 | ||
706d5860 NB |
2448 | static int target_check_write_same_discard(unsigned char *flags, struct se_device *dev) |
2449 | { | |
2450 | /* | |
2451 | * Determine if the received WRITE_SAME is used to for direct | |
2452 | * passthrough into Linux/SCSI with struct request via TCM/pSCSI | |
2453 | * or we are signaling the use of internal WRITE_SAME + UNMAP=1 | |
2454 | * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code. | |
2455 | */ | |
2456 | int passthrough = (dev->transport->transport_type == | |
2457 | TRANSPORT_PLUGIN_PHBA_PDEV); | |
2458 | ||
2459 | if (!passthrough) { | |
2460 | if ((flags[0] & 0x04) || (flags[0] & 0x02)) { | |
2461 | pr_err("WRITE_SAME PBDATA and LBDATA" | |
2462 | " bits not supported for Block Discard" | |
2463 | " Emulation\n"); | |
2464 | return -ENOSYS; | |
2465 | } | |
2466 | /* | |
2467 | * Currently for the emulated case we only accept | |
2468 | * tpws with the UNMAP=1 bit set. | |
2469 | */ | |
2470 | if (!(flags[0] & 0x08)) { | |
2471 | pr_err("WRITE_SAME w/o UNMAP bit not" | |
2472 | " supported for Block Discard Emulation\n"); | |
2473 | return -ENOSYS; | |
2474 | } | |
2475 | } | |
2476 | ||
2477 | return 0; | |
2478 | } | |
2479 | ||
c66ac9db NB |
2480 | /* transport_generic_cmd_sequencer(): |
2481 | * | |
2482 | * Generic Command Sequencer that should work for most DAS transport | |
2483 | * drivers. | |
2484 | * | |
2485 | * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD | |
2486 | * RX Thread. | |
2487 | * | |
2488 | * FIXME: Need to support other SCSI OPCODES where as well. | |
2489 | */ | |
2490 | static int transport_generic_cmd_sequencer( | |
2491 | struct se_cmd *cmd, | |
2492 | unsigned char *cdb) | |
2493 | { | |
5951146d | 2494 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
2495 | struct se_subsystem_dev *su_dev = dev->se_sub_dev; |
2496 | int ret = 0, sector_ret = 0, passthrough; | |
2497 | u32 sectors = 0, size = 0, pr_reg_type = 0; | |
2498 | u16 service_action; | |
2499 | u8 alua_ascq = 0; | |
2500 | /* | |
2501 | * Check for an existing UNIT ATTENTION condition | |
2502 | */ | |
2503 | if (core_scsi3_ua_check(cmd, cdb) < 0) { | |
c66ac9db NB |
2504 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; |
2505 | cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION; | |
5951146d | 2506 | return -EINVAL; |
c66ac9db NB |
2507 | } |
2508 | /* | |
2509 | * Check status of Asymmetric Logical Unit Assignment port | |
2510 | */ | |
e3d6f909 | 2511 | ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq); |
c66ac9db | 2512 | if (ret != 0) { |
c66ac9db | 2513 | /* |
25985edc | 2514 | * Set SCSI additional sense code (ASC) to 'LUN Not Accessible'; |
c66ac9db NB |
2515 | * The ALUA additional sense code qualifier (ASCQ) is determined |
2516 | * by the ALUA primary or secondary access state.. | |
2517 | */ | |
2518 | if (ret > 0) { | |
2519 | #if 0 | |
6708bb27 | 2520 | pr_debug("[%s]: ALUA TG Port not available," |
c66ac9db | 2521 | " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n", |
e3d6f909 | 2522 | cmd->se_tfo->get_fabric_name(), alua_ascq); |
c66ac9db NB |
2523 | #endif |
2524 | transport_set_sense_codes(cmd, 0x04, alua_ascq); | |
2525 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
2526 | cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY; | |
5951146d | 2527 | return -EINVAL; |
c66ac9db NB |
2528 | } |
2529 | goto out_invalid_cdb_field; | |
2530 | } | |
2531 | /* | |
2532 | * Check status for SPC-3 Persistent Reservations | |
2533 | */ | |
e3d6f909 AG |
2534 | if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type) != 0) { |
2535 | if (su_dev->t10_pr.pr_ops.t10_seq_non_holder( | |
03e98c9e NB |
2536 | cmd, cdb, pr_reg_type) != 0) { |
2537 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
2538 | cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT; | |
2539 | cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; | |
2540 | return -EBUSY; | |
2541 | } | |
c66ac9db NB |
2542 | /* |
2543 | * This means the CDB is allowed for the SCSI Initiator port | |
2544 | * when said port is *NOT* holding the legacy SPC-2 or | |
2545 | * SPC-3 Persistent Reservation. | |
2546 | */ | |
2547 | } | |
2548 | ||
5bda90c8 CH |
2549 | /* |
2550 | * If we operate in passthrough mode we skip most CDB emulation and | |
2551 | * instead hand the commands down to the physical SCSI device. | |
2552 | */ | |
2553 | passthrough = | |
2554 | (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV); | |
2555 | ||
c66ac9db NB |
2556 | switch (cdb[0]) { |
2557 | case READ_6: | |
2558 | sectors = transport_get_sectors_6(cdb, cmd, §or_ret); | |
2559 | if (sector_ret) | |
2560 | goto out_unsupported_cdb; | |
2561 | size = transport_get_size(sectors, cdb, cmd); | |
a1d8b49a | 2562 | cmd->t_task_lba = transport_lba_21(cdb); |
c66ac9db NB |
2563 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2564 | break; | |
2565 | case READ_10: | |
2566 | sectors = transport_get_sectors_10(cdb, cmd, §or_ret); | |
2567 | if (sector_ret) | |
2568 | goto out_unsupported_cdb; | |
2569 | size = transport_get_size(sectors, cdb, cmd); | |
a1d8b49a | 2570 | cmd->t_task_lba = transport_lba_32(cdb); |
c66ac9db NB |
2571 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2572 | break; | |
2573 | case READ_12: | |
2574 | sectors = transport_get_sectors_12(cdb, cmd, §or_ret); | |
2575 | if (sector_ret) | |
2576 | goto out_unsupported_cdb; | |
2577 | size = transport_get_size(sectors, cdb, cmd); | |
a1d8b49a | 2578 | cmd->t_task_lba = transport_lba_32(cdb); |
c66ac9db NB |
2579 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2580 | break; | |
2581 | case READ_16: | |
2582 | sectors = transport_get_sectors_16(cdb, cmd, §or_ret); | |
2583 | if (sector_ret) | |
2584 | goto out_unsupported_cdb; | |
2585 | size = transport_get_size(sectors, cdb, cmd); | |
a1d8b49a | 2586 | cmd->t_task_lba = transport_lba_64(cdb); |
c66ac9db NB |
2587 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2588 | break; | |
2589 | case WRITE_6: | |
2590 | sectors = transport_get_sectors_6(cdb, cmd, §or_ret); | |
2591 | if (sector_ret) | |
2592 | goto out_unsupported_cdb; | |
2593 | size = transport_get_size(sectors, cdb, cmd); | |
a1d8b49a | 2594 | cmd->t_task_lba = transport_lba_21(cdb); |
c66ac9db NB |
2595 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2596 | break; | |
2597 | case WRITE_10: | |
2598 | sectors = transport_get_sectors_10(cdb, cmd, §or_ret); | |
2599 | if (sector_ret) | |
2600 | goto out_unsupported_cdb; | |
2601 | size = transport_get_size(sectors, cdb, cmd); | |
a1d8b49a | 2602 | cmd->t_task_lba = transport_lba_32(cdb); |
2d3a4b51 CH |
2603 | if (cdb[1] & 0x8) |
2604 | cmd->se_cmd_flags |= SCF_FUA; | |
c66ac9db NB |
2605 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2606 | break; | |
2607 | case WRITE_12: | |
2608 | sectors = transport_get_sectors_12(cdb, cmd, §or_ret); | |
2609 | if (sector_ret) | |
2610 | goto out_unsupported_cdb; | |
2611 | size = transport_get_size(sectors, cdb, cmd); | |
a1d8b49a | 2612 | cmd->t_task_lba = transport_lba_32(cdb); |
2d3a4b51 CH |
2613 | if (cdb[1] & 0x8) |
2614 | cmd->se_cmd_flags |= SCF_FUA; | |
c66ac9db NB |
2615 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2616 | break; | |
2617 | case WRITE_16: | |
2618 | sectors = transport_get_sectors_16(cdb, cmd, §or_ret); | |
2619 | if (sector_ret) | |
2620 | goto out_unsupported_cdb; | |
2621 | size = transport_get_size(sectors, cdb, cmd); | |
a1d8b49a | 2622 | cmd->t_task_lba = transport_lba_64(cdb); |
2d3a4b51 CH |
2623 | if (cdb[1] & 0x8) |
2624 | cmd->se_cmd_flags |= SCF_FUA; | |
c66ac9db NB |
2625 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2626 | break; | |
2627 | case XDWRITEREAD_10: | |
2628 | if ((cmd->data_direction != DMA_TO_DEVICE) || | |
33c3fafc | 2629 | !(cmd->se_cmd_flags & SCF_BIDI)) |
c66ac9db NB |
2630 | goto out_invalid_cdb_field; |
2631 | sectors = transport_get_sectors_10(cdb, cmd, §or_ret); | |
2632 | if (sector_ret) | |
2633 | goto out_unsupported_cdb; | |
2634 | size = transport_get_size(sectors, cdb, cmd); | |
a1d8b49a | 2635 | cmd->t_task_lba = transport_lba_32(cdb); |
c66ac9db | 2636 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
7c1c6af3 | 2637 | |
5bda90c8 CH |
2638 | /* |
2639 | * Do now allow BIDI commands for passthrough mode. | |
2640 | */ | |
2641 | if (passthrough) | |
7c1c6af3 | 2642 | goto out_unsupported_cdb; |
5bda90c8 | 2643 | |
c66ac9db | 2644 | /* |
35e0e757 | 2645 | * Setup BIDI XOR callback to be run after I/O completion. |
c66ac9db NB |
2646 | */ |
2647 | cmd->transport_complete_callback = &transport_xor_callback; | |
2d3a4b51 CH |
2648 | if (cdb[1] & 0x8) |
2649 | cmd->se_cmd_flags |= SCF_FUA; | |
c66ac9db NB |
2650 | break; |
2651 | case VARIABLE_LENGTH_CMD: | |
2652 | service_action = get_unaligned_be16(&cdb[8]); | |
c66ac9db NB |
2653 | switch (service_action) { |
2654 | case XDWRITEREAD_32: | |
2655 | sectors = transport_get_sectors_32(cdb, cmd, §or_ret); | |
2656 | if (sector_ret) | |
2657 | goto out_unsupported_cdb; | |
2658 | size = transport_get_size(sectors, cdb, cmd); | |
2659 | /* | |
2660 | * Use WRITE_32 and READ_32 opcodes for the emulated | |
2661 | * XDWRITE_READ_32 logic. | |
2662 | */ | |
a1d8b49a | 2663 | cmd->t_task_lba = transport_lba_64_ext(cdb); |
c66ac9db NB |
2664 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2665 | ||
5bda90c8 CH |
2666 | /* |
2667 | * Do now allow BIDI commands for passthrough mode. | |
2668 | */ | |
c66ac9db | 2669 | if (passthrough) |
7c1c6af3 | 2670 | goto out_unsupported_cdb; |
5bda90c8 | 2671 | |
c66ac9db | 2672 | /* |
35e0e757 CH |
2673 | * Setup BIDI XOR callback to be run during after I/O |
2674 | * completion. | |
c66ac9db NB |
2675 | */ |
2676 | cmd->transport_complete_callback = &transport_xor_callback; | |
2d3a4b51 CH |
2677 | if (cdb[1] & 0x8) |
2678 | cmd->se_cmd_flags |= SCF_FUA; | |
c66ac9db NB |
2679 | break; |
2680 | case WRITE_SAME_32: | |
2681 | sectors = transport_get_sectors_32(cdb, cmd, §or_ret); | |
2682 | if (sector_ret) | |
2683 | goto out_unsupported_cdb; | |
dd3a5ad8 | 2684 | |
6708bb27 | 2685 | if (sectors) |
12850626 | 2686 | size = transport_get_size(1, cdb, cmd); |
6708bb27 AG |
2687 | else { |
2688 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not" | |
2689 | " supported\n"); | |
2690 | goto out_invalid_cdb_field; | |
2691 | } | |
dd3a5ad8 | 2692 | |
a1d8b49a | 2693 | cmd->t_task_lba = get_unaligned_be64(&cdb[12]); |
c66ac9db NB |
2694 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
2695 | ||
706d5860 | 2696 | if (target_check_write_same_discard(&cdb[10], dev) < 0) |
c66ac9db | 2697 | goto out_invalid_cdb_field; |
5bda90c8 CH |
2698 | if (!passthrough) |
2699 | cmd->execute_task = target_emulate_write_same; | |
c66ac9db NB |
2700 | break; |
2701 | default: | |
6708bb27 | 2702 | pr_err("VARIABLE_LENGTH_CMD service action" |
c66ac9db NB |
2703 | " 0x%04x not supported\n", service_action); |
2704 | goto out_unsupported_cdb; | |
2705 | } | |
2706 | break; | |
e434f1f1 | 2707 | case MAINTENANCE_IN: |
e3d6f909 | 2708 | if (dev->transport->get_device_type(dev) != TYPE_ROM) { |
c66ac9db NB |
2709 | /* MAINTENANCE_IN from SCC-2 */ |
2710 | /* | |
2711 | * Check for emulated MI_REPORT_TARGET_PGS. | |
2712 | */ | |
e76a35d6 CH |
2713 | if (cdb[1] == MI_REPORT_TARGET_PGS && |
2714 | su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) { | |
2715 | cmd->execute_task = | |
2716 | target_emulate_report_target_port_groups; | |
c66ac9db NB |
2717 | } |
2718 | size = (cdb[6] << 24) | (cdb[7] << 16) | | |
2719 | (cdb[8] << 8) | cdb[9]; | |
2720 | } else { | |
2721 | /* GPCMD_SEND_KEY from multi media commands */ | |
2722 | size = (cdb[8] << 8) + cdb[9]; | |
2723 | } | |
05d1c7c0 | 2724 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2725 | break; |
2726 | case MODE_SELECT: | |
2727 | size = cdb[4]; | |
2728 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; | |
2729 | break; | |
2730 | case MODE_SELECT_10: | |
2731 | size = (cdb[7] << 8) + cdb[8]; | |
2732 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; | |
2733 | break; | |
2734 | case MODE_SENSE: | |
2735 | size = cdb[4]; | |
05d1c7c0 | 2736 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
5bda90c8 CH |
2737 | if (!passthrough) |
2738 | cmd->execute_task = target_emulate_modesense; | |
c66ac9db NB |
2739 | break; |
2740 | case MODE_SENSE_10: | |
5bda90c8 CH |
2741 | size = (cdb[7] << 8) + cdb[8]; |
2742 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; | |
2743 | if (!passthrough) | |
2744 | cmd->execute_task = target_emulate_modesense; | |
2745 | break; | |
c66ac9db NB |
2746 | case GPCMD_READ_BUFFER_CAPACITY: |
2747 | case GPCMD_SEND_OPC: | |
2748 | case LOG_SELECT: | |
2749 | case LOG_SENSE: | |
2750 | size = (cdb[7] << 8) + cdb[8]; | |
05d1c7c0 | 2751 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2752 | break; |
2753 | case READ_BLOCK_LIMITS: | |
2754 | size = READ_BLOCK_LEN; | |
05d1c7c0 | 2755 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2756 | break; |
2757 | case GPCMD_GET_CONFIGURATION: | |
2758 | case GPCMD_READ_FORMAT_CAPACITIES: | |
2759 | case GPCMD_READ_DISC_INFO: | |
2760 | case GPCMD_READ_TRACK_RZONE_INFO: | |
2761 | size = (cdb[7] << 8) + cdb[8]; | |
2762 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; | |
2763 | break; | |
2764 | case PERSISTENT_RESERVE_IN: | |
617c0e06 | 2765 | if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS) |
e76a35d6 | 2766 | cmd->execute_task = target_scsi3_emulate_pr_in; |
617c0e06 CH |
2767 | size = (cdb[7] << 8) + cdb[8]; |
2768 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; | |
2769 | break; | |
c66ac9db | 2770 | case PERSISTENT_RESERVE_OUT: |
617c0e06 | 2771 | if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS) |
e76a35d6 | 2772 | cmd->execute_task = target_scsi3_emulate_pr_out; |
c66ac9db | 2773 | size = (cdb[7] << 8) + cdb[8]; |
05d1c7c0 | 2774 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2775 | break; |
2776 | case GPCMD_MECHANISM_STATUS: | |
2777 | case GPCMD_READ_DVD_STRUCTURE: | |
2778 | size = (cdb[8] << 8) + cdb[9]; | |
2779 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; | |
2780 | break; | |
2781 | case READ_POSITION: | |
2782 | size = READ_POSITION_LEN; | |
05d1c7c0 | 2783 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db | 2784 | break; |
e434f1f1 | 2785 | case MAINTENANCE_OUT: |
e3d6f909 | 2786 | if (dev->transport->get_device_type(dev) != TYPE_ROM) { |
c66ac9db NB |
2787 | /* MAINTENANCE_OUT from SCC-2 |
2788 | * | |
2789 | * Check for emulated MO_SET_TARGET_PGS. | |
2790 | */ | |
e76a35d6 CH |
2791 | if (cdb[1] == MO_SET_TARGET_PGS && |
2792 | su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) { | |
2793 | cmd->execute_task = | |
2794 | target_emulate_set_target_port_groups; | |
c66ac9db NB |
2795 | } |
2796 | ||
2797 | size = (cdb[6] << 24) | (cdb[7] << 16) | | |
2798 | (cdb[8] << 8) | cdb[9]; | |
2799 | } else { | |
2800 | /* GPCMD_REPORT_KEY from multi media commands */ | |
2801 | size = (cdb[8] << 8) + cdb[9]; | |
2802 | } | |
05d1c7c0 | 2803 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2804 | break; |
2805 | case INQUIRY: | |
2806 | size = (cdb[3] << 8) + cdb[4]; | |
2807 | /* | |
2808 | * Do implict HEAD_OF_QUEUE processing for INQUIRY. | |
2809 | * See spc4r17 section 5.3 | |
2810 | */ | |
5951146d | 2811 | if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) |
e66ecd50 | 2812 | cmd->sam_task_attr = MSG_HEAD_TAG; |
05d1c7c0 | 2813 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
5bda90c8 CH |
2814 | if (!passthrough) |
2815 | cmd->execute_task = target_emulate_inquiry; | |
c66ac9db NB |
2816 | break; |
2817 | case READ_BUFFER: | |
2818 | size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8]; | |
05d1c7c0 | 2819 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2820 | break; |
2821 | case READ_CAPACITY: | |
2822 | size = READ_CAP_LEN; | |
05d1c7c0 | 2823 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
5bda90c8 CH |
2824 | if (!passthrough) |
2825 | cmd->execute_task = target_emulate_readcapacity; | |
c66ac9db NB |
2826 | break; |
2827 | case READ_MEDIA_SERIAL_NUMBER: | |
2828 | case SECURITY_PROTOCOL_IN: | |
2829 | case SECURITY_PROTOCOL_OUT: | |
2830 | size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; | |
05d1c7c0 | 2831 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2832 | break; |
2833 | case SERVICE_ACTION_IN: | |
5bda90c8 CH |
2834 | switch (cmd->t_task_cdb[1] & 0x1f) { |
2835 | case SAI_READ_CAPACITY_16: | |
2836 | if (!passthrough) | |
2837 | cmd->execute_task = | |
2838 | target_emulate_readcapacity_16; | |
2839 | break; | |
2840 | default: | |
2841 | if (passthrough) | |
2842 | break; | |
2843 | ||
2844 | pr_err("Unsupported SA: 0x%02x\n", | |
2845 | cmd->t_task_cdb[1] & 0x1f); | |
2846 | goto out_unsupported_cdb; | |
2847 | } | |
2848 | /*FALLTHROUGH*/ | |
c66ac9db NB |
2849 | case ACCESS_CONTROL_IN: |
2850 | case ACCESS_CONTROL_OUT: | |
2851 | case EXTENDED_COPY: | |
2852 | case READ_ATTRIBUTE: | |
2853 | case RECEIVE_COPY_RESULTS: | |
2854 | case WRITE_ATTRIBUTE: | |
2855 | size = (cdb[10] << 24) | (cdb[11] << 16) | | |
2856 | (cdb[12] << 8) | cdb[13]; | |
05d1c7c0 | 2857 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2858 | break; |
2859 | case RECEIVE_DIAGNOSTIC: | |
2860 | case SEND_DIAGNOSTIC: | |
2861 | size = (cdb[3] << 8) | cdb[4]; | |
05d1c7c0 | 2862 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2863 | break; |
2864 | /* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */ | |
2865 | #if 0 | |
2866 | case GPCMD_READ_CD: | |
2867 | sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8]; | |
2868 | size = (2336 * sectors); | |
05d1c7c0 | 2869 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2870 | break; |
2871 | #endif | |
2872 | case READ_TOC: | |
2873 | size = cdb[8]; | |
05d1c7c0 | 2874 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2875 | break; |
2876 | case REQUEST_SENSE: | |
2877 | size = cdb[4]; | |
05d1c7c0 | 2878 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
5bda90c8 CH |
2879 | if (!passthrough) |
2880 | cmd->execute_task = target_emulate_request_sense; | |
c66ac9db NB |
2881 | break; |
2882 | case READ_ELEMENT_STATUS: | |
2883 | size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9]; | |
05d1c7c0 | 2884 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2885 | break; |
2886 | case WRITE_BUFFER: | |
2887 | size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8]; | |
05d1c7c0 | 2888 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2889 | break; |
2890 | case RESERVE: | |
2891 | case RESERVE_10: | |
2892 | /* | |
2893 | * The SPC-2 RESERVE does not contain a size in the SCSI CDB. | |
2894 | * Assume the passthrough or $FABRIC_MOD will tell us about it. | |
2895 | */ | |
2896 | if (cdb[0] == RESERVE_10) | |
2897 | size = (cdb[7] << 8) | cdb[8]; | |
2898 | else | |
2899 | size = cmd->data_length; | |
2900 | ||
2901 | /* | |
2902 | * Setup the legacy emulated handler for SPC-2 and | |
2903 | * >= SPC-3 compatible reservation handling (CRH=1) | |
2904 | * Otherwise, we assume the underlying SCSI logic is | |
2905 | * is running in SPC_PASSTHROUGH, and wants reservations | |
2906 | * emulation disabled. | |
2907 | */ | |
e76a35d6 CH |
2908 | if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH) |
2909 | cmd->execute_task = target_scsi2_reservation_reserve; | |
c66ac9db NB |
2910 | cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB; |
2911 | break; | |
2912 | case RELEASE: | |
2913 | case RELEASE_10: | |
2914 | /* | |
2915 | * The SPC-2 RELEASE does not contain a size in the SCSI CDB. | |
2916 | * Assume the passthrough or $FABRIC_MOD will tell us about it. | |
2917 | */ | |
2918 | if (cdb[0] == RELEASE_10) | |
2919 | size = (cdb[7] << 8) | cdb[8]; | |
2920 | else | |
2921 | size = cmd->data_length; | |
2922 | ||
e76a35d6 CH |
2923 | if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH) |
2924 | cmd->execute_task = target_scsi2_reservation_release; | |
c66ac9db NB |
2925 | cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB; |
2926 | break; | |
2927 | case SYNCHRONIZE_CACHE: | |
2928 | case 0x91: /* SYNCHRONIZE_CACHE_16: */ | |
2929 | /* | |
2930 | * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE | |
2931 | */ | |
2932 | if (cdb[0] == SYNCHRONIZE_CACHE) { | |
2933 | sectors = transport_get_sectors_10(cdb, cmd, §or_ret); | |
a1d8b49a | 2934 | cmd->t_task_lba = transport_lba_32(cdb); |
c66ac9db NB |
2935 | } else { |
2936 | sectors = transport_get_sectors_16(cdb, cmd, §or_ret); | |
a1d8b49a | 2937 | cmd->t_task_lba = transport_lba_64(cdb); |
c66ac9db NB |
2938 | } |
2939 | if (sector_ret) | |
2940 | goto out_unsupported_cdb; | |
2941 | ||
2942 | size = transport_get_size(sectors, cdb, cmd); | |
2943 | cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB; | |
2944 | ||
5bda90c8 | 2945 | if (passthrough) |
c66ac9db | 2946 | break; |
5bda90c8 | 2947 | |
c66ac9db NB |
2948 | /* |
2949 | * Check to ensure that LBA + Range does not exceed past end of | |
7abbe7f3 | 2950 | * device for IBLOCK and FILEIO ->do_sync_cache() backend calls |
c66ac9db | 2951 | */ |
7abbe7f3 NB |
2952 | if ((cmd->t_task_lba != 0) || (sectors != 0)) { |
2953 | if (transport_cmd_get_valid_sectors(cmd) < 0) | |
2954 | goto out_invalid_cdb_field; | |
2955 | } | |
5bda90c8 | 2956 | cmd->execute_task = target_emulate_synchronize_cache; |
c66ac9db NB |
2957 | break; |
2958 | case UNMAP: | |
2959 | size = get_unaligned_be16(&cdb[7]); | |
05d1c7c0 | 2960 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
5bda90c8 CH |
2961 | if (!passthrough) |
2962 | cmd->execute_task = target_emulate_unmap; | |
c66ac9db NB |
2963 | break; |
2964 | case WRITE_SAME_16: | |
2965 | sectors = transport_get_sectors_16(cdb, cmd, §or_ret); | |
2966 | if (sector_ret) | |
2967 | goto out_unsupported_cdb; | |
dd3a5ad8 | 2968 | |
6708bb27 | 2969 | if (sectors) |
12850626 | 2970 | size = transport_get_size(1, cdb, cmd); |
6708bb27 AG |
2971 | else { |
2972 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); | |
2973 | goto out_invalid_cdb_field; | |
2974 | } | |
dd3a5ad8 | 2975 | |
5db0753b | 2976 | cmd->t_task_lba = get_unaligned_be64(&cdb[2]); |
706d5860 NB |
2977 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
2978 | ||
2979 | if (target_check_write_same_discard(&cdb[1], dev) < 0) | |
2980 | goto out_invalid_cdb_field; | |
5bda90c8 CH |
2981 | if (!passthrough) |
2982 | cmd->execute_task = target_emulate_write_same; | |
706d5860 NB |
2983 | break; |
2984 | case WRITE_SAME: | |
2985 | sectors = transport_get_sectors_10(cdb, cmd, §or_ret); | |
2986 | if (sector_ret) | |
2987 | goto out_unsupported_cdb; | |
2988 | ||
2989 | if (sectors) | |
12850626 | 2990 | size = transport_get_size(1, cdb, cmd); |
706d5860 NB |
2991 | else { |
2992 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); | |
2993 | goto out_invalid_cdb_field; | |
c66ac9db | 2994 | } |
706d5860 NB |
2995 | |
2996 | cmd->t_task_lba = get_unaligned_be32(&cdb[2]); | |
c66ac9db | 2997 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
706d5860 NB |
2998 | /* |
2999 | * Follow sbcr26 with WRITE_SAME (10) and check for the existence | |
3000 | * of byte 1 bit 3 UNMAP instead of original reserved field | |
3001 | */ | |
3002 | if (target_check_write_same_discard(&cdb[1], dev) < 0) | |
3003 | goto out_invalid_cdb_field; | |
5bda90c8 CH |
3004 | if (!passthrough) |
3005 | cmd->execute_task = target_emulate_write_same; | |
c66ac9db NB |
3006 | break; |
3007 | case ALLOW_MEDIUM_REMOVAL: | |
c66ac9db | 3008 | case ERASE: |
c66ac9db NB |
3009 | case REZERO_UNIT: |
3010 | case SEEK_10: | |
c66ac9db NB |
3011 | case SPACE: |
3012 | case START_STOP: | |
3013 | case TEST_UNIT_READY: | |
3014 | case VERIFY: | |
3015 | case WRITE_FILEMARKS: | |
5bda90c8 CH |
3016 | cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB; |
3017 | if (!passthrough) | |
3018 | cmd->execute_task = target_emulate_noop; | |
3019 | break; | |
3020 | case GPCMD_CLOSE_TRACK: | |
3021 | case INITIALIZE_ELEMENT_STATUS: | |
3022 | case GPCMD_LOAD_UNLOAD: | |
3023 | case GPCMD_SET_SPEED: | |
c66ac9db NB |
3024 | case MOVE_MEDIUM: |
3025 | cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB; | |
3026 | break; | |
3027 | case REPORT_LUNS: | |
e76a35d6 | 3028 | cmd->execute_task = target_report_luns; |
c66ac9db NB |
3029 | size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; |
3030 | /* | |
3031 | * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS | |
3032 | * See spc4r17 section 5.3 | |
3033 | */ | |
5951146d | 3034 | if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) |
e66ecd50 | 3035 | cmd->sam_task_attr = MSG_HEAD_TAG; |
05d1c7c0 | 3036 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
3037 | break; |
3038 | default: | |
6708bb27 | 3039 | pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode" |
c66ac9db | 3040 | " 0x%02x, sending CHECK_CONDITION.\n", |
e3d6f909 | 3041 | cmd->se_tfo->get_fabric_name(), cdb[0]); |
c66ac9db NB |
3042 | goto out_unsupported_cdb; |
3043 | } | |
3044 | ||
3045 | if (size != cmd->data_length) { | |
6708bb27 | 3046 | pr_warn("TARGET_CORE[%s]: Expected Transfer Length:" |
c66ac9db | 3047 | " %u does not match SCSI CDB Length: %u for SAM Opcode:" |
e3d6f909 | 3048 | " 0x%02x\n", cmd->se_tfo->get_fabric_name(), |
c66ac9db NB |
3049 | cmd->data_length, size, cdb[0]); |
3050 | ||
3051 | cmd->cmd_spdtl = size; | |
3052 | ||
3053 | if (cmd->data_direction == DMA_TO_DEVICE) { | |
6708bb27 | 3054 | pr_err("Rejecting underflow/overflow" |
c66ac9db NB |
3055 | " WRITE data\n"); |
3056 | goto out_invalid_cdb_field; | |
3057 | } | |
3058 | /* | |
3059 | * Reject READ_* or WRITE_* with overflow/underflow for | |
3060 | * type SCF_SCSI_DATA_SG_IO_CDB. | |
3061 | */ | |
6708bb27 AG |
3062 | if (!ret && (dev->se_sub_dev->se_dev_attrib.block_size != 512)) { |
3063 | pr_err("Failing OVERFLOW/UNDERFLOW for LBA op" | |
c66ac9db | 3064 | " CDB on non 512-byte sector setup subsystem" |
e3d6f909 | 3065 | " plugin: %s\n", dev->transport->name); |
c66ac9db NB |
3066 | /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */ |
3067 | goto out_invalid_cdb_field; | |
3068 | } | |
3069 | ||
3070 | if (size > cmd->data_length) { | |
3071 | cmd->se_cmd_flags |= SCF_OVERFLOW_BIT; | |
3072 | cmd->residual_count = (size - cmd->data_length); | |
3073 | } else { | |
3074 | cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT; | |
3075 | cmd->residual_count = (cmd->data_length - size); | |
3076 | } | |
3077 | cmd->data_length = size; | |
3078 | } | |
3079 | ||
5bda90c8 CH |
3080 | /* reject any command that we don't have a handler for */ |
3081 | if (!(passthrough || cmd->execute_task || | |
3082 | (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB))) | |
3083 | goto out_unsupported_cdb; | |
3084 | ||
d0229ae3 AG |
3085 | /* Let's limit control cdbs to a page, for simplicity's sake. */ |
3086 | if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) && | |
3087 | size > PAGE_SIZE) | |
3088 | goto out_invalid_cdb_field; | |
3089 | ||
c66ac9db NB |
3090 | transport_set_supported_SAM_opcode(cmd); |
3091 | return ret; | |
3092 | ||
3093 | out_unsupported_cdb: | |
3094 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
3095 | cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; | |
5951146d | 3096 | return -EINVAL; |
c66ac9db NB |
3097 | out_invalid_cdb_field: |
3098 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
3099 | cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; | |
5951146d | 3100 | return -EINVAL; |
c66ac9db NB |
3101 | } |
3102 | ||
c66ac9db | 3103 | /* |
35e0e757 | 3104 | * Called from I/O completion to determine which dormant/delayed |
c66ac9db NB |
3105 | * and ordered cmds need to have their tasks added to the execution queue. |
3106 | */ | |
3107 | static void transport_complete_task_attr(struct se_cmd *cmd) | |
3108 | { | |
5951146d | 3109 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
3110 | struct se_cmd *cmd_p, *cmd_tmp; |
3111 | int new_active_tasks = 0; | |
3112 | ||
e66ecd50 | 3113 | if (cmd->sam_task_attr == MSG_SIMPLE_TAG) { |
c66ac9db NB |
3114 | atomic_dec(&dev->simple_cmds); |
3115 | smp_mb__after_atomic_dec(); | |
3116 | dev->dev_cur_ordered_id++; | |
6708bb27 | 3117 | pr_debug("Incremented dev->dev_cur_ordered_id: %u for" |
c66ac9db NB |
3118 | " SIMPLE: %u\n", dev->dev_cur_ordered_id, |
3119 | cmd->se_ordered_id); | |
e66ecd50 | 3120 | } else if (cmd->sam_task_attr == MSG_HEAD_TAG) { |
c66ac9db | 3121 | dev->dev_cur_ordered_id++; |
6708bb27 | 3122 | pr_debug("Incremented dev_cur_ordered_id: %u for" |
c66ac9db NB |
3123 | " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id, |
3124 | cmd->se_ordered_id); | |
e66ecd50 | 3125 | } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) { |
c66ac9db NB |
3126 | atomic_dec(&dev->dev_ordered_sync); |
3127 | smp_mb__after_atomic_dec(); | |
c66ac9db NB |
3128 | |
3129 | dev->dev_cur_ordered_id++; | |
6708bb27 | 3130 | pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:" |
c66ac9db NB |
3131 | " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id); |
3132 | } | |
3133 | /* | |
3134 | * Process all commands up to the last received | |
3135 | * ORDERED task attribute which requires another blocking | |
3136 | * boundary | |
3137 | */ | |
3138 | spin_lock(&dev->delayed_cmd_lock); | |
3139 | list_for_each_entry_safe(cmd_p, cmd_tmp, | |
5951146d | 3140 | &dev->delayed_cmd_list, se_delayed_node) { |
c66ac9db | 3141 | |
5951146d | 3142 | list_del(&cmd_p->se_delayed_node); |
c66ac9db NB |
3143 | spin_unlock(&dev->delayed_cmd_lock); |
3144 | ||
6708bb27 | 3145 | pr_debug("Calling add_tasks() for" |
c66ac9db NB |
3146 | " cmd_p: 0x%02x Task Attr: 0x%02x" |
3147 | " Dormant -> Active, se_ordered_id: %u\n", | |
6708bb27 | 3148 | cmd_p->t_task_cdb[0], |
c66ac9db NB |
3149 | cmd_p->sam_task_attr, cmd_p->se_ordered_id); |
3150 | ||
3151 | transport_add_tasks_from_cmd(cmd_p); | |
3152 | new_active_tasks++; | |
3153 | ||
3154 | spin_lock(&dev->delayed_cmd_lock); | |
e66ecd50 | 3155 | if (cmd_p->sam_task_attr == MSG_ORDERED_TAG) |
c66ac9db NB |
3156 | break; |
3157 | } | |
3158 | spin_unlock(&dev->delayed_cmd_lock); | |
3159 | /* | |
3160 | * If new tasks have become active, wake up the transport thread | |
3161 | * to do the processing of the Active tasks. | |
3162 | */ | |
3163 | if (new_active_tasks != 0) | |
e3d6f909 | 3164 | wake_up_interruptible(&dev->dev_queue_obj.thread_wq); |
c66ac9db NB |
3165 | } |
3166 | ||
e057f533 | 3167 | static void transport_complete_qf(struct se_cmd *cmd) |
07bde79a NB |
3168 | { |
3169 | int ret = 0; | |
3170 | ||
e057f533 CH |
3171 | if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) |
3172 | transport_complete_task_attr(cmd); | |
3173 | ||
3174 | if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) { | |
3175 | ret = cmd->se_tfo->queue_status(cmd); | |
3176 | if (ret) | |
3177 | goto out; | |
3178 | } | |
07bde79a NB |
3179 | |
3180 | switch (cmd->data_direction) { | |
3181 | case DMA_FROM_DEVICE: | |
3182 | ret = cmd->se_tfo->queue_data_in(cmd); | |
3183 | break; | |
3184 | case DMA_TO_DEVICE: | |
ec98f782 | 3185 | if (cmd->t_bidi_data_sg) { |
07bde79a NB |
3186 | ret = cmd->se_tfo->queue_data_in(cmd); |
3187 | if (ret < 0) | |
e057f533 | 3188 | break; |
07bde79a NB |
3189 | } |
3190 | /* Fall through for DMA_TO_DEVICE */ | |
3191 | case DMA_NONE: | |
3192 | ret = cmd->se_tfo->queue_status(cmd); | |
3193 | break; | |
3194 | default: | |
3195 | break; | |
3196 | } | |
3197 | ||
e057f533 CH |
3198 | out: |
3199 | if (ret < 0) { | |
3200 | transport_handle_queue_full(cmd, cmd->se_dev); | |
3201 | return; | |
3202 | } | |
3203 | transport_lun_remove_cmd(cmd); | |
3204 | transport_cmd_check_stop_to_fabric(cmd); | |
07bde79a NB |
3205 | } |
3206 | ||
3207 | static void transport_handle_queue_full( | |
3208 | struct se_cmd *cmd, | |
e057f533 | 3209 | struct se_device *dev) |
07bde79a NB |
3210 | { |
3211 | spin_lock_irq(&dev->qf_cmd_lock); | |
07bde79a NB |
3212 | list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list); |
3213 | atomic_inc(&dev->dev_qf_count); | |
3214 | smp_mb__after_atomic_inc(); | |
3215 | spin_unlock_irq(&cmd->se_dev->qf_cmd_lock); | |
3216 | ||
3217 | schedule_work(&cmd->se_dev->qf_work_queue); | |
3218 | } | |
3219 | ||
35e0e757 | 3220 | static void target_complete_ok_work(struct work_struct *work) |
c66ac9db | 3221 | { |
35e0e757 | 3222 | struct se_cmd *cmd = container_of(work, struct se_cmd, work); |
07bde79a | 3223 | int reason = 0, ret; |
35e0e757 | 3224 | |
c66ac9db NB |
3225 | /* |
3226 | * Check if we need to move delayed/dormant tasks from cmds on the | |
3227 | * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task | |
3228 | * Attribute. | |
3229 | */ | |
5951146d | 3230 | if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) |
c66ac9db | 3231 | transport_complete_task_attr(cmd); |
07bde79a NB |
3232 | /* |
3233 | * Check to schedule QUEUE_FULL work, or execute an existing | |
3234 | * cmd->transport_qf_callback() | |
3235 | */ | |
3236 | if (atomic_read(&cmd->se_dev->dev_qf_count) != 0) | |
3237 | schedule_work(&cmd->se_dev->qf_work_queue); | |
3238 | ||
c66ac9db NB |
3239 | /* |
3240 | * Check if we need to retrieve a sense buffer from | |
3241 | * the struct se_cmd in question. | |
3242 | */ | |
3243 | if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) { | |
3244 | if (transport_get_sense_data(cmd) < 0) | |
3245 | reason = TCM_NON_EXISTENT_LUN; | |
3246 | ||
3247 | /* | |
3248 | * Only set when an struct se_task->task_scsi_status returned | |
3249 | * a non GOOD status. | |
3250 | */ | |
3251 | if (cmd->scsi_status) { | |
07bde79a | 3252 | ret = transport_send_check_condition_and_sense( |
c66ac9db | 3253 | cmd, reason, 1); |
f147abb4 | 3254 | if (ret == -EAGAIN || ret == -ENOMEM) |
07bde79a NB |
3255 | goto queue_full; |
3256 | ||
c66ac9db NB |
3257 | transport_lun_remove_cmd(cmd); |
3258 | transport_cmd_check_stop_to_fabric(cmd); | |
3259 | return; | |
3260 | } | |
3261 | } | |
3262 | /* | |
25985edc | 3263 | * Check for a callback, used by amongst other things |
c66ac9db NB |
3264 | * XDWRITE_READ_10 emulation. |
3265 | */ | |
3266 | if (cmd->transport_complete_callback) | |
3267 | cmd->transport_complete_callback(cmd); | |
3268 | ||
3269 | switch (cmd->data_direction) { | |
3270 | case DMA_FROM_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.tx_data_octets += | |
c66ac9db NB |
3274 | cmd->data_length; |
3275 | } | |
3276 | spin_unlock(&cmd->se_lun->lun_sep_lock); | |
c66ac9db | 3277 | |
07bde79a | 3278 | ret = cmd->se_tfo->queue_data_in(cmd); |
f147abb4 | 3279 | if (ret == -EAGAIN || ret == -ENOMEM) |
07bde79a | 3280 | goto queue_full; |
c66ac9db NB |
3281 | break; |
3282 | case DMA_TO_DEVICE: | |
3283 | spin_lock(&cmd->se_lun->lun_sep_lock); | |
e3d6f909 AG |
3284 | if (cmd->se_lun->lun_sep) { |
3285 | cmd->se_lun->lun_sep->sep_stats.rx_data_octets += | |
c66ac9db NB |
3286 | cmd->data_length; |
3287 | } | |
3288 | spin_unlock(&cmd->se_lun->lun_sep_lock); | |
3289 | /* | |
3290 | * Check if we need to send READ payload for BIDI-COMMAND | |
3291 | */ | |
ec98f782 | 3292 | if (cmd->t_bidi_data_sg) { |
c66ac9db | 3293 | spin_lock(&cmd->se_lun->lun_sep_lock); |
e3d6f909 AG |
3294 | if (cmd->se_lun->lun_sep) { |
3295 | cmd->se_lun->lun_sep->sep_stats.tx_data_octets += | |
c66ac9db NB |
3296 | cmd->data_length; |
3297 | } | |
3298 | spin_unlock(&cmd->se_lun->lun_sep_lock); | |
07bde79a | 3299 | ret = cmd->se_tfo->queue_data_in(cmd); |
f147abb4 | 3300 | if (ret == -EAGAIN || ret == -ENOMEM) |
07bde79a | 3301 | goto queue_full; |
c66ac9db NB |
3302 | break; |
3303 | } | |
3304 | /* Fall through for DMA_TO_DEVICE */ | |
3305 | case DMA_NONE: | |
07bde79a | 3306 | ret = cmd->se_tfo->queue_status(cmd); |
f147abb4 | 3307 | if (ret == -EAGAIN || ret == -ENOMEM) |
07bde79a | 3308 | goto queue_full; |
c66ac9db NB |
3309 | break; |
3310 | default: | |
3311 | break; | |
3312 | } | |
3313 | ||
3314 | transport_lun_remove_cmd(cmd); | |
3315 | transport_cmd_check_stop_to_fabric(cmd); | |
07bde79a NB |
3316 | return; |
3317 | ||
3318 | queue_full: | |
6708bb27 | 3319 | pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p," |
07bde79a | 3320 | " data_direction: %d\n", cmd, cmd->data_direction); |
e057f533 CH |
3321 | cmd->t_state = TRANSPORT_COMPLETE_QF_OK; |
3322 | transport_handle_queue_full(cmd, cmd->se_dev); | |
c66ac9db NB |
3323 | } |
3324 | ||
3325 | static void transport_free_dev_tasks(struct se_cmd *cmd) | |
3326 | { | |
3327 | struct se_task *task, *task_tmp; | |
3328 | unsigned long flags; | |
0c2cfe5f | 3329 | LIST_HEAD(dispose_list); |
c66ac9db | 3330 | |
a1d8b49a | 3331 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 3332 | list_for_each_entry_safe(task, task_tmp, |
a1d8b49a | 3333 | &cmd->t_task_list, t_list) { |
0c2cfe5f CH |
3334 | if (!(task->task_flags & TF_ACTIVE)) |
3335 | list_move_tail(&task->t_list, &dispose_list); | |
3336 | } | |
3337 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
3338 | ||
3339 | while (!list_empty(&dispose_list)) { | |
3340 | task = list_first_entry(&dispose_list, struct se_task, t_list); | |
c66ac9db | 3341 | |
af3f00c7 CH |
3342 | if (task->task_sg != cmd->t_data_sg && |
3343 | task->task_sg != cmd->t_bidi_data_sg) | |
3344 | kfree(task->task_sg); | |
c66ac9db NB |
3345 | |
3346 | list_del(&task->t_list); | |
3347 | ||
42bf829e | 3348 | cmd->se_dev->transport->free_task(task); |
c66ac9db | 3349 | } |
c66ac9db NB |
3350 | } |
3351 | ||
6708bb27 | 3352 | static inline void transport_free_sgl(struct scatterlist *sgl, int nents) |
c66ac9db | 3353 | { |
ec98f782 | 3354 | struct scatterlist *sg; |
ec98f782 | 3355 | int count; |
c66ac9db | 3356 | |
6708bb27 AG |
3357 | for_each_sg(sgl, sg, nents, count) |
3358 | __free_page(sg_page(sg)); | |
c66ac9db | 3359 | |
6708bb27 AG |
3360 | kfree(sgl); |
3361 | } | |
c66ac9db | 3362 | |
6708bb27 AG |
3363 | static inline void transport_free_pages(struct se_cmd *cmd) |
3364 | { | |
3365 | if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) | |
3366 | return; | |
3367 | ||
3368 | transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents); | |
ec98f782 AG |
3369 | cmd->t_data_sg = NULL; |
3370 | cmd->t_data_nents = 0; | |
c66ac9db | 3371 | |
6708bb27 | 3372 | transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents); |
ec98f782 AG |
3373 | cmd->t_bidi_data_sg = NULL; |
3374 | cmd->t_bidi_data_nents = 0; | |
c66ac9db NB |
3375 | } |
3376 | ||
e26d99ae CH |
3377 | /** |
3378 | * transport_release_cmd - free a command | |
3379 | * @cmd: command to free | |
3380 | * | |
3381 | * This routine unconditionally frees a command, and reference counting | |
3382 | * or list removal must be done in the caller. | |
3383 | */ | |
3384 | static void transport_release_cmd(struct se_cmd *cmd) | |
3385 | { | |
3386 | BUG_ON(!cmd->se_tfo); | |
3387 | ||
3388 | if (cmd->se_tmr_req) | |
3389 | core_tmr_release_req(cmd->se_tmr_req); | |
3390 | if (cmd->t_task_cdb != cmd->__t_task_cdb) | |
3391 | kfree(cmd->t_task_cdb); | |
3392 | /* | |
7481deb4 NB |
3393 | * If this cmd has been setup with target_get_sess_cmd(), drop |
3394 | * the kref and call ->release_cmd() in kref callback. | |
e26d99ae | 3395 | */ |
7481deb4 NB |
3396 | if (cmd->check_release != 0) { |
3397 | target_put_sess_cmd(cmd->se_sess, cmd); | |
3398 | return; | |
3399 | } | |
e26d99ae CH |
3400 | cmd->se_tfo->release_cmd(cmd); |
3401 | } | |
3402 | ||
d3df7825 CH |
3403 | /** |
3404 | * transport_put_cmd - release a reference to a command | |
3405 | * @cmd: command to release | |
3406 | * | |
3407 | * This routine releases our reference to the command and frees it if possible. | |
3408 | */ | |
39c05f32 | 3409 | static void transport_put_cmd(struct se_cmd *cmd) |
c66ac9db NB |
3410 | { |
3411 | unsigned long flags; | |
4911e3cc | 3412 | int free_tasks = 0; |
c66ac9db | 3413 | |
a1d8b49a | 3414 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
4911e3cc CH |
3415 | if (atomic_read(&cmd->t_fe_count)) { |
3416 | if (!atomic_dec_and_test(&cmd->t_fe_count)) | |
3417 | goto out_busy; | |
3418 | } | |
3419 | ||
3420 | if (atomic_read(&cmd->t_se_count)) { | |
3421 | if (!atomic_dec_and_test(&cmd->t_se_count)) | |
3422 | goto out_busy; | |
3423 | } | |
3424 | ||
3425 | if (atomic_read(&cmd->transport_dev_active)) { | |
3426 | atomic_set(&cmd->transport_dev_active, 0); | |
3427 | transport_all_task_dev_remove_state(cmd); | |
3428 | free_tasks = 1; | |
c66ac9db | 3429 | } |
a1d8b49a | 3430 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 3431 | |
4911e3cc CH |
3432 | if (free_tasks != 0) |
3433 | transport_free_dev_tasks(cmd); | |
d3df7825 | 3434 | |
c66ac9db | 3435 | transport_free_pages(cmd); |
31afc39c | 3436 | transport_release_cmd(cmd); |
39c05f32 | 3437 | return; |
4911e3cc CH |
3438 | out_busy: |
3439 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
c66ac9db NB |
3440 | } |
3441 | ||
c66ac9db | 3442 | /* |
ec98f782 AG |
3443 | * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of |
3444 | * allocating in the core. | |
c66ac9db NB |
3445 | * @cmd: Associated se_cmd descriptor |
3446 | * @mem: SGL style memory for TCM WRITE / READ | |
3447 | * @sg_mem_num: Number of SGL elements | |
3448 | * @mem_bidi_in: SGL style memory for TCM BIDI READ | |
3449 | * @sg_mem_bidi_num: Number of BIDI READ SGL elements | |
3450 | * | |
3451 | * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage | |
3452 | * of parameters. | |
3453 | */ | |
3454 | int transport_generic_map_mem_to_cmd( | |
3455 | struct se_cmd *cmd, | |
5951146d AG |
3456 | struct scatterlist *sgl, |
3457 | u32 sgl_count, | |
3458 | struct scatterlist *sgl_bidi, | |
3459 | u32 sgl_bidi_count) | |
c66ac9db | 3460 | { |
5951146d | 3461 | if (!sgl || !sgl_count) |
c66ac9db | 3462 | return 0; |
c66ac9db | 3463 | |
c66ac9db NB |
3464 | if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) || |
3465 | (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) { | |
fef58a60 NB |
3466 | /* |
3467 | * Reject SCSI data overflow with map_mem_to_cmd() as incoming | |
3468 | * scatterlists already have been set to follow what the fabric | |
3469 | * passes for the original expected data transfer length. | |
3470 | */ | |
3471 | if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) { | |
3472 | pr_warn("Rejecting SCSI DATA overflow for fabric using" | |
3473 | " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n"); | |
3474 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
3475 | cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; | |
3476 | return -EINVAL; | |
3477 | } | |
c66ac9db | 3478 | |
ec98f782 AG |
3479 | cmd->t_data_sg = sgl; |
3480 | cmd->t_data_nents = sgl_count; | |
c66ac9db | 3481 | |
ec98f782 AG |
3482 | if (sgl_bidi && sgl_bidi_count) { |
3483 | cmd->t_bidi_data_sg = sgl_bidi; | |
3484 | cmd->t_bidi_data_nents = sgl_bidi_count; | |
c66ac9db NB |
3485 | } |
3486 | cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC; | |
c66ac9db NB |
3487 | } |
3488 | ||
3489 | return 0; | |
3490 | } | |
3491 | EXPORT_SYMBOL(transport_generic_map_mem_to_cmd); | |
3492 | ||
05d1c7c0 AG |
3493 | void *transport_kmap_first_data_page(struct se_cmd *cmd) |
3494 | { | |
ec98f782 | 3495 | struct scatterlist *sg = cmd->t_data_sg; |
05d1c7c0 | 3496 | |
ec98f782 | 3497 | BUG_ON(!sg); |
05d1c7c0 | 3498 | /* |
ec98f782 AG |
3499 | * We need to take into account a possible offset here for fabrics like |
3500 | * tcm_loop who may be using a contig buffer from the SCSI midlayer for | |
3501 | * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd() | |
05d1c7c0 | 3502 | */ |
ec98f782 | 3503 | return kmap(sg_page(sg)) + sg->offset; |
05d1c7c0 AG |
3504 | } |
3505 | EXPORT_SYMBOL(transport_kmap_first_data_page); | |
3506 | ||
3507 | void transport_kunmap_first_data_page(struct se_cmd *cmd) | |
3508 | { | |
ec98f782 | 3509 | kunmap(sg_page(cmd->t_data_sg)); |
05d1c7c0 AG |
3510 | } |
3511 | EXPORT_SYMBOL(transport_kunmap_first_data_page); | |
3512 | ||
c66ac9db | 3513 | static int |
05d1c7c0 | 3514 | transport_generic_get_mem(struct se_cmd *cmd) |
c66ac9db | 3515 | { |
ec98f782 AG |
3516 | u32 length = cmd->data_length; |
3517 | unsigned int nents; | |
3518 | struct page *page; | |
9db9da33 | 3519 | gfp_t zero_flag; |
ec98f782 | 3520 | int i = 0; |
c66ac9db | 3521 | |
ec98f782 AG |
3522 | nents = DIV_ROUND_UP(length, PAGE_SIZE); |
3523 | cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL); | |
3524 | if (!cmd->t_data_sg) | |
3525 | return -ENOMEM; | |
c66ac9db | 3526 | |
ec98f782 AG |
3527 | cmd->t_data_nents = nents; |
3528 | sg_init_table(cmd->t_data_sg, nents); | |
c66ac9db | 3529 | |
9db9da33 | 3530 | zero_flag = cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB ? 0 : __GFP_ZERO; |
3531 | ||
ec98f782 AG |
3532 | while (length) { |
3533 | u32 page_len = min_t(u32, length, PAGE_SIZE); | |
9db9da33 | 3534 | page = alloc_page(GFP_KERNEL | zero_flag); |
ec98f782 AG |
3535 | if (!page) |
3536 | goto out; | |
c66ac9db | 3537 | |
ec98f782 AG |
3538 | sg_set_page(&cmd->t_data_sg[i], page, page_len, 0); |
3539 | length -= page_len; | |
3540 | i++; | |
c66ac9db | 3541 | } |
c66ac9db | 3542 | return 0; |
c66ac9db | 3543 | |
ec98f782 AG |
3544 | out: |
3545 | while (i >= 0) { | |
3546 | __free_page(sg_page(&cmd->t_data_sg[i])); | |
3547 | i--; | |
c66ac9db | 3548 | } |
ec98f782 AG |
3549 | kfree(cmd->t_data_sg); |
3550 | cmd->t_data_sg = NULL; | |
3551 | return -ENOMEM; | |
c66ac9db NB |
3552 | } |
3553 | ||
a1d8b49a AG |
3554 | /* Reduce sectors if they are too long for the device */ |
3555 | static inline sector_t transport_limit_task_sectors( | |
c66ac9db NB |
3556 | struct se_device *dev, |
3557 | unsigned long long lba, | |
a1d8b49a | 3558 | sector_t sectors) |
c66ac9db | 3559 | { |
a1d8b49a | 3560 | sectors = min_t(sector_t, sectors, dev->se_sub_dev->se_dev_attrib.max_sectors); |
c66ac9db | 3561 | |
a1d8b49a AG |
3562 | if (dev->transport->get_device_type(dev) == TYPE_DISK) |
3563 | if ((lba + sectors) > transport_dev_end_lba(dev)) | |
3564 | sectors = ((transport_dev_end_lba(dev) - lba) + 1); | |
c66ac9db | 3565 | |
a1d8b49a | 3566 | return sectors; |
c66ac9db NB |
3567 | } |
3568 | ||
c66ac9db NB |
3569 | |
3570 | /* | |
3571 | * This function can be used by HW target mode drivers to create a linked | |
3572 | * scatterlist from all contiguously allocated struct se_task->task_sg[]. | |
3573 | * This is intended to be called during the completion path by TCM Core | |
3574 | * when struct target_core_fabric_ops->check_task_sg_chaining is enabled. | |
3575 | */ | |
3576 | void transport_do_task_sg_chain(struct se_cmd *cmd) | |
3577 | { | |
ec98f782 AG |
3578 | struct scatterlist *sg_first = NULL; |
3579 | struct scatterlist *sg_prev = NULL; | |
3580 | int sg_prev_nents = 0; | |
3581 | struct scatterlist *sg; | |
c66ac9db | 3582 | struct se_task *task; |
ec98f782 | 3583 | u32 chained_nents = 0; |
c66ac9db NB |
3584 | int i; |
3585 | ||
ec98f782 AG |
3586 | BUG_ON(!cmd->se_tfo->task_sg_chaining); |
3587 | ||
c66ac9db NB |
3588 | /* |
3589 | * Walk the struct se_task list and setup scatterlist chains | |
a1d8b49a | 3590 | * for each contiguously allocated struct se_task->task_sg[]. |
c66ac9db | 3591 | */ |
a1d8b49a | 3592 | list_for_each_entry(task, &cmd->t_task_list, t_list) { |
ec98f782 | 3593 | if (!task->task_sg) |
c66ac9db NB |
3594 | continue; |
3595 | ||
ec98f782 AG |
3596 | if (!sg_first) { |
3597 | sg_first = task->task_sg; | |
6708bb27 | 3598 | chained_nents = task->task_sg_nents; |
97868c89 | 3599 | } else { |
ec98f782 | 3600 | sg_chain(sg_prev, sg_prev_nents, task->task_sg); |
6708bb27 | 3601 | chained_nents += task->task_sg_nents; |
97868c89 | 3602 | } |
c3c74c7a NB |
3603 | /* |
3604 | * For the padded tasks, use the extra SGL vector allocated | |
3605 | * in transport_allocate_data_tasks() for the sg_prev_nents | |
04629b7b CH |
3606 | * offset into sg_chain() above. |
3607 | * | |
3608 | * We do not need the padding for the last task (or a single | |
3609 | * task), but in that case we will never use the sg_prev_nents | |
3610 | * value below which would be incorrect. | |
c3c74c7a | 3611 | */ |
04629b7b | 3612 | sg_prev_nents = (task->task_sg_nents + 1); |
ec98f782 | 3613 | sg_prev = task->task_sg; |
c66ac9db NB |
3614 | } |
3615 | /* | |
3616 | * Setup the starting pointer and total t_tasks_sg_linked_no including | |
3617 | * padding SGs for linking and to mark the end. | |
3618 | */ | |
a1d8b49a | 3619 | cmd->t_tasks_sg_chained = sg_first; |
ec98f782 | 3620 | cmd->t_tasks_sg_chained_no = chained_nents; |
c66ac9db | 3621 | |
6708bb27 | 3622 | pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and" |
a1d8b49a AG |
3623 | " t_tasks_sg_chained_no: %u\n", cmd, cmd->t_tasks_sg_chained, |
3624 | cmd->t_tasks_sg_chained_no); | |
c66ac9db | 3625 | |
a1d8b49a AG |
3626 | for_each_sg(cmd->t_tasks_sg_chained, sg, |
3627 | cmd->t_tasks_sg_chained_no, i) { | |
c66ac9db | 3628 | |
6708bb27 | 3629 | pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n", |
5951146d | 3630 | i, sg, sg_page(sg), sg->length, sg->offset); |
c66ac9db | 3631 | if (sg_is_chain(sg)) |
6708bb27 | 3632 | pr_debug("SG: %p sg_is_chain=1\n", sg); |
c66ac9db | 3633 | if (sg_is_last(sg)) |
6708bb27 | 3634 | pr_debug("SG: %p sg_is_last=1\n", sg); |
c66ac9db | 3635 | } |
c66ac9db NB |
3636 | } |
3637 | EXPORT_SYMBOL(transport_do_task_sg_chain); | |
3638 | ||
a1d8b49a AG |
3639 | /* |
3640 | * Break up cmd into chunks transport can handle | |
3641 | */ | |
38b40067 CH |
3642 | static int |
3643 | transport_allocate_data_tasks(struct se_cmd *cmd, | |
c66ac9db | 3644 | enum dma_data_direction data_direction, |
38b40067 | 3645 | struct scatterlist *cmd_sg, unsigned int sgl_nents) |
c66ac9db | 3646 | { |
5951146d | 3647 | struct se_device *dev = cmd->se_dev; |
a3eedc22 | 3648 | int task_count, i; |
38b40067 CH |
3649 | unsigned long long lba; |
3650 | sector_t sectors, dev_max_sectors; | |
3651 | u32 sector_size; | |
3652 | ||
3653 | if (transport_cmd_get_valid_sectors(cmd) < 0) | |
3654 | return -EINVAL; | |
3655 | ||
3656 | dev_max_sectors = dev->se_sub_dev->se_dev_attrib.max_sectors; | |
3657 | sector_size = dev->se_sub_dev->se_dev_attrib.block_size; | |
a1d8b49a | 3658 | |
ec98f782 | 3659 | WARN_ON(cmd->data_length % sector_size); |
38b40067 CH |
3660 | |
3661 | lba = cmd->t_task_lba; | |
ec98f782 | 3662 | sectors = DIV_ROUND_UP(cmd->data_length, sector_size); |
277c5f27 | 3663 | task_count = DIV_ROUND_UP_SECTOR_T(sectors, dev_max_sectors); |
af3f00c7 CH |
3664 | |
3665 | /* | |
3666 | * If we need just a single task reuse the SG list in the command | |
3667 | * and avoid a lot of work. | |
3668 | */ | |
3669 | if (task_count == 1) { | |
3670 | struct se_task *task; | |
3671 | unsigned long flags; | |
3672 | ||
3673 | task = transport_generic_get_task(cmd, data_direction); | |
3674 | if (!task) | |
3675 | return -ENOMEM; | |
3676 | ||
3677 | task->task_sg = cmd_sg; | |
3678 | task->task_sg_nents = sgl_nents; | |
3679 | ||
3680 | task->task_lba = lba; | |
3681 | task->task_sectors = sectors; | |
3682 | task->task_size = task->task_sectors * sector_size; | |
3683 | ||
3684 | spin_lock_irqsave(&cmd->t_state_lock, flags); | |
3685 | list_add_tail(&task->t_list, &cmd->t_task_list); | |
3686 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
3687 | ||
3688 | return task_count; | |
3689 | } | |
3690 | ||
ec98f782 | 3691 | for (i = 0; i < task_count; i++) { |
38b40067 | 3692 | struct se_task *task; |
c3c74c7a | 3693 | unsigned int task_size, task_sg_nents_padded; |
38b40067 CH |
3694 | struct scatterlist *sg; |
3695 | unsigned long flags; | |
ec98f782 | 3696 | int count; |
a1d8b49a | 3697 | |
c66ac9db | 3698 | task = transport_generic_get_task(cmd, data_direction); |
a1d8b49a | 3699 | if (!task) |
ec98f782 | 3700 | return -ENOMEM; |
c66ac9db | 3701 | |
c66ac9db | 3702 | task->task_lba = lba; |
ec98f782 AG |
3703 | task->task_sectors = min(sectors, dev_max_sectors); |
3704 | task->task_size = task->task_sectors * sector_size; | |
c66ac9db | 3705 | |
525a48a2 NB |
3706 | /* |
3707 | * This now assumes that passed sg_ents are in PAGE_SIZE chunks | |
3708 | * in order to calculate the number per task SGL entries | |
3709 | */ | |
3710 | task->task_sg_nents = DIV_ROUND_UP(task->task_size, PAGE_SIZE); | |
c66ac9db | 3711 | /* |
ec98f782 AG |
3712 | * Check if the fabric module driver is requesting that all |
3713 | * struct se_task->task_sg[] be chained together.. If so, | |
3714 | * then allocate an extra padding SG entry for linking and | |
c3c74c7a NB |
3715 | * marking the end of the chained SGL for every task except |
3716 | * the last one for (task_count > 1) operation, or skipping | |
3717 | * the extra padding for the (task_count == 1) case. | |
c66ac9db | 3718 | */ |
c3c74c7a NB |
3719 | if (cmd->se_tfo->task_sg_chaining && (i < (task_count - 1))) { |
3720 | task_sg_nents_padded = (task->task_sg_nents + 1); | |
c3c74c7a NB |
3721 | } else |
3722 | task_sg_nents_padded = task->task_sg_nents; | |
c66ac9db | 3723 | |
1d20bb61 | 3724 | task->task_sg = kmalloc(sizeof(struct scatterlist) * |
c3c74c7a | 3725 | task_sg_nents_padded, GFP_KERNEL); |
ec98f782 AG |
3726 | if (!task->task_sg) { |
3727 | cmd->se_dev->transport->free_task(task); | |
3728 | return -ENOMEM; | |
3729 | } | |
3730 | ||
c3c74c7a | 3731 | sg_init_table(task->task_sg, task_sg_nents_padded); |
c66ac9db | 3732 | |
ec98f782 AG |
3733 | task_size = task->task_size; |
3734 | ||
3735 | /* Build new sgl, only up to task_size */ | |
6708bb27 | 3736 | for_each_sg(task->task_sg, sg, task->task_sg_nents, count) { |
ec98f782 AG |
3737 | if (cmd_sg->length > task_size) |
3738 | break; | |
3739 | ||
3740 | *sg = *cmd_sg; | |
3741 | task_size -= cmd_sg->length; | |
3742 | cmd_sg = sg_next(cmd_sg); | |
c66ac9db | 3743 | } |
c66ac9db | 3744 | |
ec98f782 AG |
3745 | lba += task->task_sectors; |
3746 | sectors -= task->task_sectors; | |
c66ac9db | 3747 | |
ec98f782 AG |
3748 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
3749 | list_add_tail(&task->t_list, &cmd->t_task_list); | |
3750 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
c66ac9db NB |
3751 | } |
3752 | ||
ec98f782 | 3753 | return task_count; |
c66ac9db NB |
3754 | } |
3755 | ||
3756 | static int | |
ec98f782 | 3757 | transport_allocate_control_task(struct se_cmd *cmd) |
c66ac9db | 3758 | { |
c66ac9db | 3759 | struct se_task *task; |
ec98f782 | 3760 | unsigned long flags; |
c66ac9db | 3761 | |
91ec1d35 NB |
3762 | /* Workaround for handling zero-length control CDBs */ |
3763 | if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) && | |
3764 | !cmd->data_length) | |
3765 | return 0; | |
3766 | ||
c66ac9db NB |
3767 | task = transport_generic_get_task(cmd, cmd->data_direction); |
3768 | if (!task) | |
ec98f782 | 3769 | return -ENOMEM; |
c66ac9db | 3770 | |
af3f00c7 | 3771 | task->task_sg = cmd->t_data_sg; |
c66ac9db | 3772 | task->task_size = cmd->data_length; |
6708bb27 | 3773 | task->task_sg_nents = cmd->t_data_nents; |
c66ac9db | 3774 | |
ec98f782 AG |
3775 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
3776 | list_add_tail(&task->t_list, &cmd->t_task_list); | |
3777 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
c66ac9db | 3778 | |
6708bb27 | 3779 | /* Success! Return number of tasks allocated */ |
a3eedc22 | 3780 | return 1; |
ec98f782 AG |
3781 | } |
3782 | ||
da0f7619 CH |
3783 | /* |
3784 | * Allocate any required ressources to execute the command, and either place | |
3785 | * it on the execution queue if possible. For writes we might not have the | |
3786 | * payload yet, thus notify the fabric via a call to ->write_pending instead. | |
c66ac9db | 3787 | */ |
a1d8b49a | 3788 | int transport_generic_new_cmd(struct se_cmd *cmd) |
c66ac9db | 3789 | { |
da0f7619 | 3790 | struct se_device *dev = cmd->se_dev; |
9ac54987 | 3791 | int task_cdbs, task_cdbs_bidi = 0; |
da0f7619 | 3792 | int set_counts = 1; |
c66ac9db NB |
3793 | int ret = 0; |
3794 | ||
3795 | /* | |
3796 | * Determine is the TCM fabric module has already allocated physical | |
3797 | * memory, and is directly calling transport_generic_map_mem_to_cmd() | |
ec98f782 | 3798 | * beforehand. |
c66ac9db | 3799 | */ |
ec98f782 AG |
3800 | if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) && |
3801 | cmd->data_length) { | |
05d1c7c0 | 3802 | ret = transport_generic_get_mem(cmd); |
c66ac9db | 3803 | if (ret < 0) |
03e98c9e | 3804 | goto out_fail; |
c66ac9db | 3805 | } |
da0f7619 | 3806 | |
1d20bb61 | 3807 | /* |
38b40067 | 3808 | * For BIDI command set up the read tasks first. |
1d20bb61 | 3809 | */ |
da0f7619 | 3810 | if (cmd->t_bidi_data_sg && |
38b40067 CH |
3811 | dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) { |
3812 | BUG_ON(!(cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)); | |
3813 | ||
9ac54987 NB |
3814 | task_cdbs_bidi = transport_allocate_data_tasks(cmd, |
3815 | DMA_FROM_DEVICE, cmd->t_bidi_data_sg, | |
3816 | cmd->t_bidi_data_nents); | |
3817 | if (task_cdbs_bidi <= 0) | |
da0f7619 CH |
3818 | goto out_fail; |
3819 | ||
3820 | atomic_inc(&cmd->t_fe_count); | |
3821 | atomic_inc(&cmd->t_se_count); | |
3822 | set_counts = 0; | |
3823 | } | |
38b40067 CH |
3824 | |
3825 | if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) { | |
3826 | task_cdbs = transport_allocate_data_tasks(cmd, | |
3827 | cmd->data_direction, cmd->t_data_sg, | |
3828 | cmd->t_data_nents); | |
3829 | } else { | |
3830 | task_cdbs = transport_allocate_control_task(cmd); | |
3831 | } | |
3832 | ||
410f6702 | 3833 | if (task_cdbs < 0) |
da0f7619 | 3834 | goto out_fail; |
410f6702 RD |
3835 | else if (!task_cdbs && (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)) { |
3836 | cmd->t_state = TRANSPORT_COMPLETE; | |
3837 | atomic_set(&cmd->t_transport_active, 1); | |
91ec1d35 NB |
3838 | |
3839 | if (cmd->t_task_cdb[0] == REQUEST_SENSE) { | |
3840 | u8 ua_asc = 0, ua_ascq = 0; | |
3841 | ||
3842 | core_scsi3_ua_clear_for_request_sense(cmd, | |
3843 | &ua_asc, &ua_ascq); | |
3844 | } | |
3845 | ||
410f6702 RD |
3846 | INIT_WORK(&cmd->work, target_complete_ok_work); |
3847 | queue_work(target_completion_wq, &cmd->work); | |
3848 | return 0; | |
3849 | } | |
da0f7619 CH |
3850 | |
3851 | if (set_counts) { | |
3852 | atomic_inc(&cmd->t_fe_count); | |
3853 | atomic_inc(&cmd->t_se_count); | |
3854 | } | |
3855 | ||
9ac54987 NB |
3856 | cmd->t_task_list_num = (task_cdbs + task_cdbs_bidi); |
3857 | atomic_set(&cmd->t_task_cdbs_left, cmd->t_task_list_num); | |
3858 | atomic_set(&cmd->t_task_cdbs_ex_left, cmd->t_task_list_num); | |
da0f7619 | 3859 | |
c66ac9db | 3860 | /* |
a1d8b49a | 3861 | * For WRITEs, let the fabric know its buffer is ready.. |
c66ac9db NB |
3862 | * This WRITE struct se_cmd (and all of its associated struct se_task's) |
3863 | * will be added to the struct se_device execution queue after its WRITE | |
3864 | * data has arrived. (ie: It gets handled by the transport processing | |
3865 | * thread a second time) | |
3866 | */ | |
3867 | if (cmd->data_direction == DMA_TO_DEVICE) { | |
3868 | transport_add_tasks_to_state_queue(cmd); | |
3869 | return transport_generic_write_pending(cmd); | |
3870 | } | |
3871 | /* | |
3872 | * Everything else but a WRITE, add the struct se_cmd's struct se_task's | |
3873 | * to the execution queue. | |
3874 | */ | |
3875 | transport_execute_tasks(cmd); | |
3876 | return 0; | |
da0f7619 CH |
3877 | |
3878 | out_fail: | |
3879 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
3880 | cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
3881 | return -EINVAL; | |
c66ac9db | 3882 | } |
a1d8b49a | 3883 | EXPORT_SYMBOL(transport_generic_new_cmd); |
c66ac9db NB |
3884 | |
3885 | /* transport_generic_process_write(): | |
3886 | * | |
3887 | * | |
3888 | */ | |
3889 | void transport_generic_process_write(struct se_cmd *cmd) | |
3890 | { | |
c66ac9db NB |
3891 | transport_execute_tasks(cmd); |
3892 | } | |
3893 | EXPORT_SYMBOL(transport_generic_process_write); | |
3894 | ||
e057f533 | 3895 | static void transport_write_pending_qf(struct se_cmd *cmd) |
07bde79a | 3896 | { |
f147abb4 NB |
3897 | int ret; |
3898 | ||
3899 | ret = cmd->se_tfo->write_pending(cmd); | |
3900 | if (ret == -EAGAIN || ret == -ENOMEM) { | |
e057f533 CH |
3901 | pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", |
3902 | cmd); | |
3903 | transport_handle_queue_full(cmd, cmd->se_dev); | |
3904 | } | |
07bde79a NB |
3905 | } |
3906 | ||
c66ac9db NB |
3907 | static int transport_generic_write_pending(struct se_cmd *cmd) |
3908 | { | |
3909 | unsigned long flags; | |
3910 | int ret; | |
3911 | ||
a1d8b49a | 3912 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 3913 | cmd->t_state = TRANSPORT_WRITE_PENDING; |
a1d8b49a | 3914 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
07bde79a | 3915 | |
c66ac9db NB |
3916 | /* |
3917 | * Clear the se_cmd for WRITE_PENDING status in order to set | |
a1d8b49a | 3918 | * cmd->t_transport_active=0 so that transport_generic_handle_data |
c66ac9db | 3919 | * can be called from HW target mode interrupt code. This is safe |
e3d6f909 | 3920 | * to be called with transport_off=1 before the cmd->se_tfo->write_pending |
c66ac9db NB |
3921 | * because the se_cmd->se_lun pointer is not being cleared. |
3922 | */ | |
3923 | transport_cmd_check_stop(cmd, 1, 0); | |
3924 | ||
3925 | /* | |
3926 | * Call the fabric write_pending function here to let the | |
3927 | * frontend know that WRITE buffers are ready. | |
3928 | */ | |
e3d6f909 | 3929 | ret = cmd->se_tfo->write_pending(cmd); |
f147abb4 | 3930 | if (ret == -EAGAIN || ret == -ENOMEM) |
07bde79a NB |
3931 | goto queue_full; |
3932 | else if (ret < 0) | |
c66ac9db NB |
3933 | return ret; |
3934 | ||
03e98c9e | 3935 | return 1; |
07bde79a NB |
3936 | |
3937 | queue_full: | |
6708bb27 | 3938 | pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd); |
07bde79a | 3939 | cmd->t_state = TRANSPORT_COMPLETE_QF_WP; |
e057f533 | 3940 | transport_handle_queue_full(cmd, cmd->se_dev); |
f147abb4 | 3941 | return 0; |
c66ac9db NB |
3942 | } |
3943 | ||
39c05f32 | 3944 | void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks) |
c66ac9db | 3945 | { |
d14921d6 NB |
3946 | if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) { |
3947 | if (wait_for_tasks && cmd->se_tmr_req) | |
3948 | transport_wait_for_tasks(cmd); | |
3949 | ||
35462975 | 3950 | transport_release_cmd(cmd); |
d14921d6 NB |
3951 | } else { |
3952 | if (wait_for_tasks) | |
3953 | transport_wait_for_tasks(cmd); | |
3954 | ||
c66ac9db NB |
3955 | core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd); |
3956 | ||
82f1c8a4 | 3957 | if (cmd->se_lun) |
c66ac9db | 3958 | transport_lun_remove_cmd(cmd); |
c66ac9db | 3959 | |
f4366772 NB |
3960 | transport_free_dev_tasks(cmd); |
3961 | ||
39c05f32 | 3962 | transport_put_cmd(cmd); |
c66ac9db NB |
3963 | } |
3964 | } | |
3965 | EXPORT_SYMBOL(transport_generic_free_cmd); | |
3966 | ||
a17f091d NB |
3967 | /* target_get_sess_cmd - Add command to active ->sess_cmd_list |
3968 | * @se_sess: session to reference | |
3969 | * @se_cmd: command descriptor to add | |
a6360785 | 3970 | * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd() |
a17f091d | 3971 | */ |
a6360785 NB |
3972 | void target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd, |
3973 | bool ack_kref) | |
a17f091d NB |
3974 | { |
3975 | unsigned long flags; | |
3976 | ||
7481deb4 | 3977 | kref_init(&se_cmd->cmd_kref); |
a6360785 NB |
3978 | /* |
3979 | * Add a second kref if the fabric caller is expecting to handle | |
3980 | * fabric acknowledgement that requires two target_put_sess_cmd() | |
3981 | * invocations before se_cmd descriptor release. | |
3982 | */ | |
3983 | if (ack_kref == true) | |
3984 | kref_get(&se_cmd->cmd_kref); | |
7481deb4 | 3985 | |
a17f091d NB |
3986 | spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); |
3987 | list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list); | |
3988 | se_cmd->check_release = 1; | |
3989 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); | |
3990 | } | |
3991 | EXPORT_SYMBOL(target_get_sess_cmd); | |
3992 | ||
7481deb4 | 3993 | static void target_release_cmd_kref(struct kref *kref) |
a17f091d | 3994 | { |
7481deb4 NB |
3995 | struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref); |
3996 | struct se_session *se_sess = se_cmd->se_sess; | |
a17f091d NB |
3997 | unsigned long flags; |
3998 | ||
3999 | spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); | |
4000 | if (list_empty(&se_cmd->se_cmd_list)) { | |
4001 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); | |
4002 | WARN_ON(1); | |
7481deb4 | 4003 | return; |
a17f091d | 4004 | } |
a17f091d NB |
4005 | if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) { |
4006 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); | |
4007 | complete(&se_cmd->cmd_wait_comp); | |
7481deb4 | 4008 | return; |
a17f091d NB |
4009 | } |
4010 | list_del(&se_cmd->se_cmd_list); | |
4011 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); | |
4012 | ||
7481deb4 NB |
4013 | se_cmd->se_tfo->release_cmd(se_cmd); |
4014 | } | |
4015 | ||
4016 | /* target_put_sess_cmd - Check for active I/O shutdown via kref_put | |
4017 | * @se_sess: session to reference | |
4018 | * @se_cmd: command descriptor to drop | |
4019 | */ | |
4020 | int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd) | |
4021 | { | |
4022 | return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref); | |
a17f091d NB |
4023 | } |
4024 | EXPORT_SYMBOL(target_put_sess_cmd); | |
4025 | ||
4026 | /* target_splice_sess_cmd_list - Split active cmds into sess_wait_list | |
4027 | * @se_sess: session to split | |
4028 | */ | |
4029 | void target_splice_sess_cmd_list(struct se_session *se_sess) | |
4030 | { | |
4031 | struct se_cmd *se_cmd; | |
4032 | unsigned long flags; | |
4033 | ||
4034 | WARN_ON(!list_empty(&se_sess->sess_wait_list)); | |
4035 | INIT_LIST_HEAD(&se_sess->sess_wait_list); | |
4036 | ||
4037 | spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); | |
4038 | se_sess->sess_tearing_down = 1; | |
4039 | ||
4040 | list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list); | |
4041 | ||
4042 | list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list) | |
4043 | se_cmd->cmd_wait_set = 1; | |
4044 | ||
4045 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); | |
4046 | } | |
4047 | EXPORT_SYMBOL(target_splice_sess_cmd_list); | |
4048 | ||
4049 | /* target_wait_for_sess_cmds - Wait for outstanding descriptors | |
4050 | * @se_sess: session to wait for active I/O | |
4051 | * @wait_for_tasks: Make extra transport_wait_for_tasks call | |
4052 | */ | |
4053 | void target_wait_for_sess_cmds( | |
4054 | struct se_session *se_sess, | |
4055 | int wait_for_tasks) | |
4056 | { | |
4057 | struct se_cmd *se_cmd, *tmp_cmd; | |
4058 | bool rc = false; | |
4059 | ||
4060 | list_for_each_entry_safe(se_cmd, tmp_cmd, | |
4061 | &se_sess->sess_wait_list, se_cmd_list) { | |
4062 | list_del(&se_cmd->se_cmd_list); | |
4063 | ||
4064 | pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:" | |
4065 | " %d\n", se_cmd, se_cmd->t_state, | |
4066 | se_cmd->se_tfo->get_cmd_state(se_cmd)); | |
4067 | ||
4068 | if (wait_for_tasks) { | |
4069 | pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d," | |
4070 | " fabric state: %d\n", se_cmd, se_cmd->t_state, | |
4071 | se_cmd->se_tfo->get_cmd_state(se_cmd)); | |
4072 | ||
4073 | rc = transport_wait_for_tasks(se_cmd); | |
4074 | ||
4075 | pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d," | |
4076 | " fabric state: %d\n", se_cmd, se_cmd->t_state, | |
4077 | se_cmd->se_tfo->get_cmd_state(se_cmd)); | |
4078 | } | |
4079 | ||
4080 | if (!rc) { | |
4081 | wait_for_completion(&se_cmd->cmd_wait_comp); | |
4082 | pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d" | |
4083 | " fabric state: %d\n", se_cmd, se_cmd->t_state, | |
4084 | se_cmd->se_tfo->get_cmd_state(se_cmd)); | |
4085 | } | |
4086 | ||
4087 | se_cmd->se_tfo->release_cmd(se_cmd); | |
4088 | } | |
4089 | } | |
4090 | EXPORT_SYMBOL(target_wait_for_sess_cmds); | |
4091 | ||
c66ac9db NB |
4092 | /* transport_lun_wait_for_tasks(): |
4093 | * | |
4094 | * Called from ConfigFS context to stop the passed struct se_cmd to allow | |
4095 | * an struct se_lun to be successfully shutdown. | |
4096 | */ | |
4097 | static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun) | |
4098 | { | |
4099 | unsigned long flags; | |
4100 | int ret; | |
4101 | /* | |
4102 | * If the frontend has already requested this struct se_cmd to | |
4103 | * be stopped, we can safely ignore this struct se_cmd. | |
4104 | */ | |
a1d8b49a AG |
4105 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
4106 | if (atomic_read(&cmd->t_transport_stop)) { | |
4107 | atomic_set(&cmd->transport_lun_stop, 0); | |
6708bb27 | 4108 | pr_debug("ConfigFS ITT[0x%08x] - t_transport_stop ==" |
e3d6f909 | 4109 | " TRUE, skipping\n", cmd->se_tfo->get_task_tag(cmd)); |
a1d8b49a | 4110 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 4111 | transport_cmd_check_stop(cmd, 1, 0); |
e3d6f909 | 4112 | return -EPERM; |
c66ac9db | 4113 | } |
a1d8b49a AG |
4114 | atomic_set(&cmd->transport_lun_fe_stop, 1); |
4115 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
c66ac9db | 4116 | |
5951146d | 4117 | wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq); |
c66ac9db NB |
4118 | |
4119 | ret = transport_stop_tasks_for_cmd(cmd); | |
4120 | ||
6708bb27 AG |
4121 | pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:" |
4122 | " %d\n", cmd, cmd->t_task_list_num, ret); | |
c66ac9db | 4123 | if (!ret) { |
6708bb27 | 4124 | pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n", |
e3d6f909 | 4125 | cmd->se_tfo->get_task_tag(cmd)); |
a1d8b49a | 4126 | wait_for_completion(&cmd->transport_lun_stop_comp); |
6708bb27 | 4127 | pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n", |
e3d6f909 | 4128 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 4129 | } |
3df8d40b | 4130 | transport_remove_cmd_from_queue(cmd); |
c66ac9db NB |
4131 | |
4132 | return 0; | |
4133 | } | |
4134 | ||
c66ac9db NB |
4135 | static void __transport_clear_lun_from_sessions(struct se_lun *lun) |
4136 | { | |
4137 | struct se_cmd *cmd = NULL; | |
4138 | unsigned long lun_flags, cmd_flags; | |
4139 | /* | |
4140 | * Do exception processing and return CHECK_CONDITION status to the | |
4141 | * Initiator Port. | |
4142 | */ | |
4143 | spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags); | |
5951146d AG |
4144 | while (!list_empty(&lun->lun_cmd_list)) { |
4145 | cmd = list_first_entry(&lun->lun_cmd_list, | |
4146 | struct se_cmd, se_lun_node); | |
4147 | list_del(&cmd->se_lun_node); | |
4148 | ||
a1d8b49a | 4149 | atomic_set(&cmd->transport_lun_active, 0); |
c66ac9db NB |
4150 | /* |
4151 | * This will notify iscsi_target_transport.c: | |
4152 | * transport_cmd_check_stop() that a LUN shutdown is in | |
4153 | * progress for the iscsi_cmd_t. | |
4154 | */ | |
a1d8b49a | 4155 | spin_lock(&cmd->t_state_lock); |
6708bb27 | 4156 | pr_debug("SE_LUN[%d] - Setting cmd->transport" |
c66ac9db | 4157 | "_lun_stop for ITT: 0x%08x\n", |
e3d6f909 AG |
4158 | cmd->se_lun->unpacked_lun, |
4159 | cmd->se_tfo->get_task_tag(cmd)); | |
a1d8b49a AG |
4160 | atomic_set(&cmd->transport_lun_stop, 1); |
4161 | spin_unlock(&cmd->t_state_lock); | |
c66ac9db NB |
4162 | |
4163 | spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags); | |
4164 | ||
6708bb27 AG |
4165 | if (!cmd->se_lun) { |
4166 | pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n", | |
e3d6f909 AG |
4167 | cmd->se_tfo->get_task_tag(cmd), |
4168 | cmd->se_tfo->get_cmd_state(cmd), cmd->t_state); | |
c66ac9db NB |
4169 | BUG(); |
4170 | } | |
4171 | /* | |
4172 | * If the Storage engine still owns the iscsi_cmd_t, determine | |
4173 | * and/or stop its context. | |
4174 | */ | |
6708bb27 | 4175 | pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport" |
e3d6f909 AG |
4176 | "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun, |
4177 | cmd->se_tfo->get_task_tag(cmd)); | |
c66ac9db | 4178 | |
e3d6f909 | 4179 | if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) { |
c66ac9db NB |
4180 | spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags); |
4181 | continue; | |
4182 | } | |
4183 | ||
6708bb27 | 4184 | pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun" |
c66ac9db | 4185 | "_wait_for_tasks(): SUCCESS\n", |
e3d6f909 AG |
4186 | cmd->se_lun->unpacked_lun, |
4187 | cmd->se_tfo->get_task_tag(cmd)); | |
c66ac9db | 4188 | |
a1d8b49a | 4189 | spin_lock_irqsave(&cmd->t_state_lock, cmd_flags); |
6708bb27 | 4190 | if (!atomic_read(&cmd->transport_dev_active)) { |
a1d8b49a | 4191 | spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags); |
c66ac9db NB |
4192 | goto check_cond; |
4193 | } | |
a1d8b49a | 4194 | atomic_set(&cmd->transport_dev_active, 0); |
c66ac9db | 4195 | transport_all_task_dev_remove_state(cmd); |
a1d8b49a | 4196 | spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags); |
c66ac9db NB |
4197 | |
4198 | transport_free_dev_tasks(cmd); | |
4199 | /* | |
4200 | * The Storage engine stopped this struct se_cmd before it was | |
4201 | * send to the fabric frontend for delivery back to the | |
4202 | * Initiator Node. Return this SCSI CDB back with an | |
4203 | * CHECK_CONDITION status. | |
4204 | */ | |
4205 | check_cond: | |
4206 | transport_send_check_condition_and_sense(cmd, | |
4207 | TCM_NON_EXISTENT_LUN, 0); | |
4208 | /* | |
4209 | * If the fabric frontend is waiting for this iscsi_cmd_t to | |
4210 | * be released, notify the waiting thread now that LU has | |
4211 | * finished accessing it. | |
4212 | */ | |
a1d8b49a AG |
4213 | spin_lock_irqsave(&cmd->t_state_lock, cmd_flags); |
4214 | if (atomic_read(&cmd->transport_lun_fe_stop)) { | |
6708bb27 | 4215 | pr_debug("SE_LUN[%d] - Detected FE stop for" |
c66ac9db NB |
4216 | " struct se_cmd: %p ITT: 0x%08x\n", |
4217 | lun->unpacked_lun, | |
e3d6f909 | 4218 | cmd, cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 4219 | |
a1d8b49a | 4220 | spin_unlock_irqrestore(&cmd->t_state_lock, |
c66ac9db NB |
4221 | cmd_flags); |
4222 | transport_cmd_check_stop(cmd, 1, 0); | |
a1d8b49a | 4223 | complete(&cmd->transport_lun_fe_stop_comp); |
c66ac9db NB |
4224 | spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags); |
4225 | continue; | |
4226 | } | |
6708bb27 | 4227 | pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n", |
e3d6f909 | 4228 | lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 4229 | |
a1d8b49a | 4230 | spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags); |
c66ac9db NB |
4231 | spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags); |
4232 | } | |
4233 | spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags); | |
4234 | } | |
4235 | ||
4236 | static int transport_clear_lun_thread(void *p) | |
4237 | { | |
8359cf43 | 4238 | struct se_lun *lun = p; |
c66ac9db NB |
4239 | |
4240 | __transport_clear_lun_from_sessions(lun); | |
4241 | complete(&lun->lun_shutdown_comp); | |
4242 | ||
4243 | return 0; | |
4244 | } | |
4245 | ||
4246 | int transport_clear_lun_from_sessions(struct se_lun *lun) | |
4247 | { | |
4248 | struct task_struct *kt; | |
4249 | ||
5951146d | 4250 | kt = kthread_run(transport_clear_lun_thread, lun, |
c66ac9db NB |
4251 | "tcm_cl_%u", lun->unpacked_lun); |
4252 | if (IS_ERR(kt)) { | |
6708bb27 | 4253 | pr_err("Unable to start clear_lun thread\n"); |
e3d6f909 | 4254 | return PTR_ERR(kt); |
c66ac9db NB |
4255 | } |
4256 | wait_for_completion(&lun->lun_shutdown_comp); | |
4257 | ||
4258 | return 0; | |
4259 | } | |
4260 | ||
d14921d6 NB |
4261 | /** |
4262 | * transport_wait_for_tasks - wait for completion to occur | |
4263 | * @cmd: command to wait | |
c66ac9db | 4264 | * |
d14921d6 NB |
4265 | * Called from frontend fabric context to wait for storage engine |
4266 | * to pause and/or release frontend generated struct se_cmd. | |
c66ac9db | 4267 | */ |
a17f091d | 4268 | bool transport_wait_for_tasks(struct se_cmd *cmd) |
c66ac9db NB |
4269 | { |
4270 | unsigned long flags; | |
4271 | ||
a1d8b49a | 4272 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
d14921d6 NB |
4273 | if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && !(cmd->se_tmr_req)) { |
4274 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
a17f091d | 4275 | return false; |
d14921d6 NB |
4276 | } |
4277 | /* | |
4278 | * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE | |
4279 | * has been set in transport_set_supported_SAM_opcode(). | |
4280 | */ | |
4281 | if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) && !cmd->se_tmr_req) { | |
4282 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
a17f091d | 4283 | return false; |
d14921d6 | 4284 | } |
c66ac9db NB |
4285 | /* |
4286 | * If we are already stopped due to an external event (ie: LUN shutdown) | |
4287 | * sleep until the connection can have the passed struct se_cmd back. | |
a1d8b49a | 4288 | * The cmd->transport_lun_stopped_sem will be upped by |
c66ac9db NB |
4289 | * transport_clear_lun_from_sessions() once the ConfigFS context caller |
4290 | * has completed its operation on the struct se_cmd. | |
4291 | */ | |
a1d8b49a | 4292 | if (atomic_read(&cmd->transport_lun_stop)) { |
c66ac9db | 4293 | |
6708bb27 | 4294 | pr_debug("wait_for_tasks: Stopping" |
e3d6f909 | 4295 | " wait_for_completion(&cmd->t_tasktransport_lun_fe" |
c66ac9db | 4296 | "_stop_comp); for ITT: 0x%08x\n", |
e3d6f909 | 4297 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db NB |
4298 | /* |
4299 | * There is a special case for WRITES where a FE exception + | |
4300 | * LUN shutdown means ConfigFS context is still sleeping on | |
4301 | * transport_lun_stop_comp in transport_lun_wait_for_tasks(). | |
4302 | * We go ahead and up transport_lun_stop_comp just to be sure | |
4303 | * here. | |
4304 | */ | |
a1d8b49a AG |
4305 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
4306 | complete(&cmd->transport_lun_stop_comp); | |
4307 | wait_for_completion(&cmd->transport_lun_fe_stop_comp); | |
4308 | spin_lock_irqsave(&cmd->t_state_lock, flags); | |
c66ac9db NB |
4309 | |
4310 | transport_all_task_dev_remove_state(cmd); | |
4311 | /* | |
4312 | * At this point, the frontend who was the originator of this | |
4313 | * struct se_cmd, now owns the structure and can be released through | |
4314 | * normal means below. | |
4315 | */ | |
6708bb27 | 4316 | pr_debug("wait_for_tasks: Stopped" |
e3d6f909 | 4317 | " wait_for_completion(&cmd->t_tasktransport_lun_fe_" |
c66ac9db | 4318 | "stop_comp); for ITT: 0x%08x\n", |
e3d6f909 | 4319 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 4320 | |
a1d8b49a | 4321 | atomic_set(&cmd->transport_lun_stop, 0); |
c66ac9db | 4322 | } |
a1d8b49a | 4323 | if (!atomic_read(&cmd->t_transport_active) || |
d14921d6 NB |
4324 | atomic_read(&cmd->t_transport_aborted)) { |
4325 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
a17f091d | 4326 | return false; |
d14921d6 | 4327 | } |
c66ac9db | 4328 | |
a1d8b49a | 4329 | atomic_set(&cmd->t_transport_stop, 1); |
c66ac9db | 4330 | |
6708bb27 | 4331 | pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x" |
f2da9dbd CH |
4332 | " i_state: %d, t_state: %d, t_transport_stop = TRUE\n", |
4333 | cmd, cmd->se_tfo->get_task_tag(cmd), | |
4334 | cmd->se_tfo->get_cmd_state(cmd), cmd->t_state); | |
c66ac9db | 4335 | |
a1d8b49a | 4336 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 4337 | |
5951146d | 4338 | wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq); |
c66ac9db | 4339 | |
a1d8b49a | 4340 | wait_for_completion(&cmd->t_transport_stop_comp); |
c66ac9db | 4341 | |
a1d8b49a AG |
4342 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
4343 | atomic_set(&cmd->t_transport_active, 0); | |
4344 | atomic_set(&cmd->t_transport_stop, 0); | |
c66ac9db | 4345 | |
6708bb27 | 4346 | pr_debug("wait_for_tasks: Stopped wait_for_compltion(" |
a1d8b49a | 4347 | "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n", |
e3d6f909 | 4348 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 4349 | |
d14921d6 | 4350 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
a17f091d NB |
4351 | |
4352 | return true; | |
c66ac9db | 4353 | } |
d14921d6 | 4354 | EXPORT_SYMBOL(transport_wait_for_tasks); |
c66ac9db NB |
4355 | |
4356 | static int transport_get_sense_codes( | |
4357 | struct se_cmd *cmd, | |
4358 | u8 *asc, | |
4359 | u8 *ascq) | |
4360 | { | |
4361 | *asc = cmd->scsi_asc; | |
4362 | *ascq = cmd->scsi_ascq; | |
4363 | ||
4364 | return 0; | |
4365 | } | |
4366 | ||
4367 | static int transport_set_sense_codes( | |
4368 | struct se_cmd *cmd, | |
4369 | u8 asc, | |
4370 | u8 ascq) | |
4371 | { | |
4372 | cmd->scsi_asc = asc; | |
4373 | cmd->scsi_ascq = ascq; | |
4374 | ||
4375 | return 0; | |
4376 | } | |
4377 | ||
4378 | int transport_send_check_condition_and_sense( | |
4379 | struct se_cmd *cmd, | |
4380 | u8 reason, | |
4381 | int from_transport) | |
4382 | { | |
4383 | unsigned char *buffer = cmd->sense_buffer; | |
4384 | unsigned long flags; | |
4385 | int offset; | |
4386 | u8 asc = 0, ascq = 0; | |
4387 | ||
a1d8b49a | 4388 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 4389 | if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) { |
a1d8b49a | 4390 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
4391 | return 0; |
4392 | } | |
4393 | cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION; | |
a1d8b49a | 4394 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
4395 | |
4396 | if (!reason && from_transport) | |
4397 | goto after_reason; | |
4398 | ||
4399 | if (!from_transport) | |
4400 | cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE; | |
4401 | /* | |
4402 | * Data Segment and SenseLength of the fabric response PDU. | |
4403 | * | |
4404 | * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE | |
4405 | * from include/scsi/scsi_cmnd.h | |
4406 | */ | |
e3d6f909 | 4407 | offset = cmd->se_tfo->set_fabric_sense_len(cmd, |
c66ac9db NB |
4408 | TRANSPORT_SENSE_BUFFER); |
4409 | /* | |
4410 | * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses | |
4411 | * SENSE KEY values from include/scsi/scsi.h | |
4412 | */ | |
4413 | switch (reason) { | |
4414 | case TCM_NON_EXISTENT_LUN: | |
eb39d340 NB |
4415 | /* CURRENT ERROR */ |
4416 | buffer[offset] = 0x70; | |
895f3022 | 4417 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
eb39d340 NB |
4418 | /* ILLEGAL REQUEST */ |
4419 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; | |
4420 | /* LOGICAL UNIT NOT SUPPORTED */ | |
4421 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25; | |
4422 | break; | |
c66ac9db NB |
4423 | case TCM_UNSUPPORTED_SCSI_OPCODE: |
4424 | case TCM_SECTOR_COUNT_TOO_MANY: | |
4425 | /* CURRENT ERROR */ | |
4426 | buffer[offset] = 0x70; | |
895f3022 | 4427 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
4428 | /* ILLEGAL REQUEST */ |
4429 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; | |
4430 | /* INVALID COMMAND OPERATION CODE */ | |
4431 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20; | |
4432 | break; | |
4433 | case TCM_UNKNOWN_MODE_PAGE: | |
4434 | /* CURRENT ERROR */ | |
4435 | buffer[offset] = 0x70; | |
895f3022 | 4436 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
4437 | /* ILLEGAL REQUEST */ |
4438 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; | |
4439 | /* INVALID FIELD IN CDB */ | |
4440 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24; | |
4441 | break; | |
4442 | case TCM_CHECK_CONDITION_ABORT_CMD: | |
4443 | /* CURRENT ERROR */ | |
4444 | buffer[offset] = 0x70; | |
895f3022 | 4445 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
4446 | /* ABORTED COMMAND */ |
4447 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; | |
4448 | /* BUS DEVICE RESET FUNCTION OCCURRED */ | |
4449 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29; | |
4450 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03; | |
4451 | break; | |
4452 | case TCM_INCORRECT_AMOUNT_OF_DATA: | |
4453 | /* CURRENT ERROR */ | |
4454 | buffer[offset] = 0x70; | |
895f3022 | 4455 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
4456 | /* ABORTED COMMAND */ |
4457 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; | |
4458 | /* WRITE ERROR */ | |
4459 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c; | |
4460 | /* NOT ENOUGH UNSOLICITED DATA */ | |
4461 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d; | |
4462 | break; | |
4463 | case TCM_INVALID_CDB_FIELD: | |
4464 | /* CURRENT ERROR */ | |
4465 | buffer[offset] = 0x70; | |
895f3022 | 4466 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
9fbc8909 RD |
4467 | /* ILLEGAL REQUEST */ |
4468 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; | |
c66ac9db NB |
4469 | /* INVALID FIELD IN CDB */ |
4470 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24; | |
4471 | break; | |
4472 | case TCM_INVALID_PARAMETER_LIST: | |
4473 | /* CURRENT ERROR */ | |
4474 | buffer[offset] = 0x70; | |
895f3022 | 4475 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
9fbc8909 RD |
4476 | /* ILLEGAL REQUEST */ |
4477 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; | |
c66ac9db NB |
4478 | /* INVALID FIELD IN PARAMETER LIST */ |
4479 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26; | |
4480 | break; | |
4481 | case TCM_UNEXPECTED_UNSOLICITED_DATA: | |
4482 | /* CURRENT ERROR */ | |
4483 | buffer[offset] = 0x70; | |
895f3022 | 4484 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
4485 | /* ABORTED COMMAND */ |
4486 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; | |
4487 | /* WRITE ERROR */ | |
4488 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c; | |
4489 | /* UNEXPECTED_UNSOLICITED_DATA */ | |
4490 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c; | |
4491 | break; | |
4492 | case TCM_SERVICE_CRC_ERROR: | |
4493 | /* CURRENT ERROR */ | |
4494 | buffer[offset] = 0x70; | |
895f3022 | 4495 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
4496 | /* ABORTED COMMAND */ |
4497 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; | |
4498 | /* PROTOCOL SERVICE CRC ERROR */ | |
4499 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47; | |
4500 | /* N/A */ | |
4501 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05; | |
4502 | break; | |
4503 | case TCM_SNACK_REJECTED: | |
4504 | /* CURRENT ERROR */ | |
4505 | buffer[offset] = 0x70; | |
895f3022 | 4506 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
4507 | /* ABORTED COMMAND */ |
4508 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; | |
4509 | /* READ ERROR */ | |
4510 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11; | |
4511 | /* FAILED RETRANSMISSION REQUEST */ | |
4512 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13; | |
4513 | break; | |
4514 | case TCM_WRITE_PROTECTED: | |
4515 | /* CURRENT ERROR */ | |
4516 | buffer[offset] = 0x70; | |
895f3022 | 4517 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
4518 | /* DATA PROTECT */ |
4519 | buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT; | |
4520 | /* WRITE PROTECTED */ | |
4521 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27; | |
4522 | break; | |
4523 | case TCM_CHECK_CONDITION_UNIT_ATTENTION: | |
4524 | /* CURRENT ERROR */ | |
4525 | buffer[offset] = 0x70; | |
895f3022 | 4526 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
4527 | /* UNIT ATTENTION */ |
4528 | buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION; | |
4529 | core_scsi3_ua_for_check_condition(cmd, &asc, &ascq); | |
4530 | buffer[offset+SPC_ASC_KEY_OFFSET] = asc; | |
4531 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq; | |
4532 | break; | |
4533 | case TCM_CHECK_CONDITION_NOT_READY: | |
4534 | /* CURRENT ERROR */ | |
4535 | buffer[offset] = 0x70; | |
895f3022 | 4536 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
4537 | /* Not Ready */ |
4538 | buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY; | |
4539 | transport_get_sense_codes(cmd, &asc, &ascq); | |
4540 | buffer[offset+SPC_ASC_KEY_OFFSET] = asc; | |
4541 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq; | |
4542 | break; | |
4543 | case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE: | |
4544 | default: | |
4545 | /* CURRENT ERROR */ | |
4546 | buffer[offset] = 0x70; | |
895f3022 | 4547 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
4548 | /* ILLEGAL REQUEST */ |
4549 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; | |
4550 | /* LOGICAL UNIT COMMUNICATION FAILURE */ | |
4551 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80; | |
4552 | break; | |
4553 | } | |
4554 | /* | |
4555 | * This code uses linux/include/scsi/scsi.h SAM status codes! | |
4556 | */ | |
4557 | cmd->scsi_status = SAM_STAT_CHECK_CONDITION; | |
4558 | /* | |
4559 | * Automatically padded, this value is encoded in the fabric's | |
4560 | * data_length response PDU containing the SCSI defined sense data. | |
4561 | */ | |
4562 | cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset; | |
4563 | ||
4564 | after_reason: | |
07bde79a | 4565 | return cmd->se_tfo->queue_status(cmd); |
c66ac9db NB |
4566 | } |
4567 | EXPORT_SYMBOL(transport_send_check_condition_and_sense); | |
4568 | ||
4569 | int transport_check_aborted_status(struct se_cmd *cmd, int send_status) | |
4570 | { | |
4571 | int ret = 0; | |
4572 | ||
a1d8b49a | 4573 | if (atomic_read(&cmd->t_transport_aborted) != 0) { |
6708bb27 | 4574 | if (!send_status || |
c66ac9db NB |
4575 | (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS)) |
4576 | return 1; | |
4577 | #if 0 | |
6708bb27 | 4578 | pr_debug("Sending delayed SAM_STAT_TASK_ABORTED" |
c66ac9db | 4579 | " status for CDB: 0x%02x ITT: 0x%08x\n", |
a1d8b49a | 4580 | cmd->t_task_cdb[0], |
e3d6f909 | 4581 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db NB |
4582 | #endif |
4583 | cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS; | |
e3d6f909 | 4584 | cmd->se_tfo->queue_status(cmd); |
c66ac9db NB |
4585 | ret = 1; |
4586 | } | |
4587 | return ret; | |
4588 | } | |
4589 | EXPORT_SYMBOL(transport_check_aborted_status); | |
4590 | ||
4591 | void transport_send_task_abort(struct se_cmd *cmd) | |
4592 | { | |
c252f003 NB |
4593 | unsigned long flags; |
4594 | ||
4595 | spin_lock_irqsave(&cmd->t_state_lock, flags); | |
4596 | if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) { | |
4597 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
4598 | return; | |
4599 | } | |
4600 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
4601 | ||
c66ac9db NB |
4602 | /* |
4603 | * If there are still expected incoming fabric WRITEs, we wait | |
4604 | * until until they have completed before sending a TASK_ABORTED | |
4605 | * response. This response with TASK_ABORTED status will be | |
4606 | * queued back to fabric module by transport_check_aborted_status(). | |
4607 | */ | |
4608 | if (cmd->data_direction == DMA_TO_DEVICE) { | |
e3d6f909 | 4609 | if (cmd->se_tfo->write_pending_status(cmd) != 0) { |
a1d8b49a | 4610 | atomic_inc(&cmd->t_transport_aborted); |
c66ac9db | 4611 | smp_mb__after_atomic_inc(); |
c66ac9db NB |
4612 | } |
4613 | } | |
4614 | cmd->scsi_status = SAM_STAT_TASK_ABORTED; | |
4615 | #if 0 | |
6708bb27 | 4616 | pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x," |
a1d8b49a | 4617 | " ITT: 0x%08x\n", cmd->t_task_cdb[0], |
e3d6f909 | 4618 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 4619 | #endif |
e3d6f909 | 4620 | cmd->se_tfo->queue_status(cmd); |
c66ac9db NB |
4621 | } |
4622 | ||
e26d99ae | 4623 | static int transport_generic_do_tmr(struct se_cmd *cmd) |
c66ac9db | 4624 | { |
5951146d | 4625 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
4626 | struct se_tmr_req *tmr = cmd->se_tmr_req; |
4627 | int ret; | |
4628 | ||
4629 | switch (tmr->function) { | |
5c6cd613 | 4630 | case TMR_ABORT_TASK: |
c66ac9db NB |
4631 | tmr->response = TMR_FUNCTION_REJECTED; |
4632 | break; | |
5c6cd613 NB |
4633 | case TMR_ABORT_TASK_SET: |
4634 | case TMR_CLEAR_ACA: | |
4635 | case TMR_CLEAR_TASK_SET: | |
c66ac9db NB |
4636 | tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED; |
4637 | break; | |
5c6cd613 | 4638 | case TMR_LUN_RESET: |
c66ac9db NB |
4639 | ret = core_tmr_lun_reset(dev, tmr, NULL, NULL); |
4640 | tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE : | |
4641 | TMR_FUNCTION_REJECTED; | |
4642 | break; | |
5c6cd613 | 4643 | case TMR_TARGET_WARM_RESET: |
c66ac9db NB |
4644 | tmr->response = TMR_FUNCTION_REJECTED; |
4645 | break; | |
5c6cd613 | 4646 | case TMR_TARGET_COLD_RESET: |
c66ac9db NB |
4647 | tmr->response = TMR_FUNCTION_REJECTED; |
4648 | break; | |
c66ac9db | 4649 | default: |
6708bb27 | 4650 | pr_err("Uknown TMR function: 0x%02x.\n", |
c66ac9db NB |
4651 | tmr->function); |
4652 | tmr->response = TMR_FUNCTION_REJECTED; | |
4653 | break; | |
4654 | } | |
4655 | ||
4656 | cmd->t_state = TRANSPORT_ISTATE_PROCESSING; | |
e3d6f909 | 4657 | cmd->se_tfo->queue_tm_rsp(cmd); |
c66ac9db | 4658 | |
b7b8bef7 | 4659 | transport_cmd_check_stop_to_fabric(cmd); |
c66ac9db NB |
4660 | return 0; |
4661 | } | |
4662 | ||
c66ac9db NB |
4663 | /* transport_processing_thread(): |
4664 | * | |
4665 | * | |
4666 | */ | |
4667 | static int transport_processing_thread(void *param) | |
4668 | { | |
5951146d | 4669 | int ret; |
c66ac9db | 4670 | struct se_cmd *cmd; |
8359cf43 | 4671 | struct se_device *dev = param; |
c66ac9db | 4672 | |
c66ac9db | 4673 | while (!kthread_should_stop()) { |
e3d6f909 AG |
4674 | ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq, |
4675 | atomic_read(&dev->dev_queue_obj.queue_cnt) || | |
c66ac9db NB |
4676 | kthread_should_stop()); |
4677 | if (ret < 0) | |
4678 | goto out; | |
4679 | ||
c66ac9db | 4680 | get_cmd: |
5951146d AG |
4681 | cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj); |
4682 | if (!cmd) | |
c66ac9db NB |
4683 | continue; |
4684 | ||
5951146d | 4685 | switch (cmd->t_state) { |
680b73c5 CH |
4686 | case TRANSPORT_NEW_CMD: |
4687 | BUG(); | |
4688 | break; | |
c66ac9db | 4689 | case TRANSPORT_NEW_CMD_MAP: |
6708bb27 AG |
4690 | if (!cmd->se_tfo->new_cmd_map) { |
4691 | pr_err("cmd->se_tfo->new_cmd_map is" | |
c66ac9db NB |
4692 | " NULL for TRANSPORT_NEW_CMD_MAP\n"); |
4693 | BUG(); | |
4694 | } | |
e3d6f909 | 4695 | ret = cmd->se_tfo->new_cmd_map(cmd); |
c66ac9db | 4696 | if (ret < 0) { |
03e98c9e | 4697 | transport_generic_request_failure(cmd); |
c66ac9db NB |
4698 | break; |
4699 | } | |
c66ac9db | 4700 | ret = transport_generic_new_cmd(cmd); |
f147abb4 | 4701 | if (ret < 0) { |
03e98c9e NB |
4702 | transport_generic_request_failure(cmd); |
4703 | break; | |
c66ac9db NB |
4704 | } |
4705 | break; | |
4706 | case TRANSPORT_PROCESS_WRITE: | |
4707 | transport_generic_process_write(cmd); | |
4708 | break; | |
c66ac9db NB |
4709 | case TRANSPORT_PROCESS_TMR: |
4710 | transport_generic_do_tmr(cmd); | |
4711 | break; | |
07bde79a | 4712 | case TRANSPORT_COMPLETE_QF_WP: |
e057f533 CH |
4713 | transport_write_pending_qf(cmd); |
4714 | break; | |
4715 | case TRANSPORT_COMPLETE_QF_OK: | |
4716 | transport_complete_qf(cmd); | |
07bde79a | 4717 | break; |
c66ac9db | 4718 | default: |
f2da9dbd CH |
4719 | pr_err("Unknown t_state: %d for ITT: 0x%08x " |
4720 | "i_state: %d on SE LUN: %u\n", | |
4721 | cmd->t_state, | |
e3d6f909 AG |
4722 | cmd->se_tfo->get_task_tag(cmd), |
4723 | cmd->se_tfo->get_cmd_state(cmd), | |
4724 | cmd->se_lun->unpacked_lun); | |
c66ac9db NB |
4725 | BUG(); |
4726 | } | |
4727 | ||
4728 | goto get_cmd; | |
4729 | } | |
4730 | ||
4731 | out: | |
ce8762f6 NB |
4732 | WARN_ON(!list_empty(&dev->state_task_list)); |
4733 | WARN_ON(!list_empty(&dev->dev_queue_obj.qobj_list)); | |
c66ac9db NB |
4734 | dev->process_thread = NULL; |
4735 | return 0; | |
4736 | } |