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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> |
015487b8 | 40 | #include <linux/ratelimit.h> |
c66ac9db NB |
41 | #include <asm/unaligned.h> |
42 | #include <net/sock.h> | |
43 | #include <net/tcp.h> | |
44 | #include <scsi/scsi.h> | |
45 | #include <scsi/scsi_cmnd.h> | |
e66ecd50 | 46 | #include <scsi/scsi_tcq.h> |
c66ac9db NB |
47 | |
48 | #include <target/target_core_base.h> | |
c4795fb2 CH |
49 | #include <target/target_core_backend.h> |
50 | #include <target/target_core_fabric.h> | |
c66ac9db NB |
51 | #include <target/target_core_configfs.h> |
52 | ||
e26d99ae | 53 | #include "target_core_internal.h" |
c66ac9db | 54 | #include "target_core_alua.h" |
c66ac9db | 55 | #include "target_core_pr.h" |
c66ac9db NB |
56 | #include "target_core_ua.h" |
57 | ||
e3d6f909 | 58 | static int sub_api_initialized; |
c66ac9db | 59 | |
35e0e757 | 60 | static struct workqueue_struct *target_completion_wq; |
c66ac9db | 61 | static struct kmem_cache *se_sess_cache; |
c66ac9db | 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); |
35e0e757 | 80 | static void target_complete_ok_work(struct work_struct *work); |
c66ac9db | 81 | |
e3d6f909 | 82 | int init_se_kmem_caches(void) |
c66ac9db | 83 | { |
c66ac9db NB |
84 | se_sess_cache = kmem_cache_create("se_sess_cache", |
85 | sizeof(struct se_session), __alignof__(struct se_session), | |
86 | 0, NULL); | |
6708bb27 AG |
87 | if (!se_sess_cache) { |
88 | pr_err("kmem_cache_create() for struct se_session" | |
c66ac9db | 89 | " failed\n"); |
c8e31f26 | 90 | goto out; |
c66ac9db NB |
91 | } |
92 | se_ua_cache = kmem_cache_create("se_ua_cache", | |
93 | sizeof(struct se_ua), __alignof__(struct se_ua), | |
94 | 0, NULL); | |
6708bb27 AG |
95 | if (!se_ua_cache) { |
96 | pr_err("kmem_cache_create() for struct se_ua failed\n"); | |
35e0e757 | 97 | goto out_free_sess_cache; |
c66ac9db | 98 | } |
c66ac9db NB |
99 | t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache", |
100 | sizeof(struct t10_pr_registration), | |
101 | __alignof__(struct t10_pr_registration), 0, NULL); | |
6708bb27 AG |
102 | if (!t10_pr_reg_cache) { |
103 | pr_err("kmem_cache_create() for struct t10_pr_registration" | |
c66ac9db | 104 | " failed\n"); |
35e0e757 | 105 | goto out_free_ua_cache; |
c66ac9db NB |
106 | } |
107 | t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache", | |
108 | sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp), | |
109 | 0, NULL); | |
6708bb27 AG |
110 | if (!t10_alua_lu_gp_cache) { |
111 | pr_err("kmem_cache_create() for t10_alua_lu_gp_cache" | |
c66ac9db | 112 | " failed\n"); |
35e0e757 | 113 | goto out_free_pr_reg_cache; |
c66ac9db NB |
114 | } |
115 | t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache", | |
116 | sizeof(struct t10_alua_lu_gp_member), | |
117 | __alignof__(struct t10_alua_lu_gp_member), 0, NULL); | |
6708bb27 AG |
118 | if (!t10_alua_lu_gp_mem_cache) { |
119 | pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_" | |
c66ac9db | 120 | "cache failed\n"); |
35e0e757 | 121 | goto out_free_lu_gp_cache; |
c66ac9db NB |
122 | } |
123 | t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache", | |
124 | sizeof(struct t10_alua_tg_pt_gp), | |
125 | __alignof__(struct t10_alua_tg_pt_gp), 0, NULL); | |
6708bb27 AG |
126 | if (!t10_alua_tg_pt_gp_cache) { |
127 | pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_" | |
c66ac9db | 128 | "cache failed\n"); |
35e0e757 | 129 | goto out_free_lu_gp_mem_cache; |
c66ac9db NB |
130 | } |
131 | t10_alua_tg_pt_gp_mem_cache = kmem_cache_create( | |
132 | "t10_alua_tg_pt_gp_mem_cache", | |
133 | sizeof(struct t10_alua_tg_pt_gp_member), | |
134 | __alignof__(struct t10_alua_tg_pt_gp_member), | |
135 | 0, NULL); | |
6708bb27 AG |
136 | if (!t10_alua_tg_pt_gp_mem_cache) { |
137 | pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_" | |
c66ac9db | 138 | "mem_t failed\n"); |
35e0e757 | 139 | goto out_free_tg_pt_gp_cache; |
c66ac9db NB |
140 | } |
141 | ||
35e0e757 CH |
142 | target_completion_wq = alloc_workqueue("target_completion", |
143 | WQ_MEM_RECLAIM, 0); | |
144 | if (!target_completion_wq) | |
145 | goto out_free_tg_pt_gp_mem_cache; | |
146 | ||
c66ac9db | 147 | return 0; |
35e0e757 CH |
148 | |
149 | out_free_tg_pt_gp_mem_cache: | |
150 | kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache); | |
151 | out_free_tg_pt_gp_cache: | |
152 | kmem_cache_destroy(t10_alua_tg_pt_gp_cache); | |
153 | out_free_lu_gp_mem_cache: | |
154 | kmem_cache_destroy(t10_alua_lu_gp_mem_cache); | |
155 | out_free_lu_gp_cache: | |
156 | kmem_cache_destroy(t10_alua_lu_gp_cache); | |
157 | out_free_pr_reg_cache: | |
158 | kmem_cache_destroy(t10_pr_reg_cache); | |
159 | out_free_ua_cache: | |
160 | kmem_cache_destroy(se_ua_cache); | |
161 | out_free_sess_cache: | |
162 | kmem_cache_destroy(se_sess_cache); | |
c66ac9db | 163 | out: |
e3d6f909 | 164 | return -ENOMEM; |
c66ac9db NB |
165 | } |
166 | ||
e3d6f909 | 167 | void release_se_kmem_caches(void) |
c66ac9db | 168 | { |
35e0e757 | 169 | destroy_workqueue(target_completion_wq); |
c66ac9db NB |
170 | kmem_cache_destroy(se_sess_cache); |
171 | kmem_cache_destroy(se_ua_cache); | |
c66ac9db NB |
172 | kmem_cache_destroy(t10_pr_reg_cache); |
173 | kmem_cache_destroy(t10_alua_lu_gp_cache); | |
174 | kmem_cache_destroy(t10_alua_lu_gp_mem_cache); | |
175 | kmem_cache_destroy(t10_alua_tg_pt_gp_cache); | |
176 | kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache); | |
c66ac9db NB |
177 | } |
178 | ||
e3d6f909 AG |
179 | /* This code ensures unique mib indexes are handed out. */ |
180 | static DEFINE_SPINLOCK(scsi_mib_index_lock); | |
181 | static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX]; | |
e89d15ee NB |
182 | |
183 | /* | |
184 | * Allocate a new row index for the entry type specified | |
185 | */ | |
186 | u32 scsi_get_new_index(scsi_index_t type) | |
187 | { | |
188 | u32 new_index; | |
189 | ||
e3d6f909 | 190 | BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX)); |
e89d15ee | 191 | |
e3d6f909 AG |
192 | spin_lock(&scsi_mib_index_lock); |
193 | new_index = ++scsi_mib_index[type]; | |
194 | spin_unlock(&scsi_mib_index_lock); | |
e89d15ee NB |
195 | |
196 | return new_index; | |
197 | } | |
198 | ||
e26d99ae | 199 | static void transport_init_queue_obj(struct se_queue_obj *qobj) |
c66ac9db NB |
200 | { |
201 | atomic_set(&qobj->queue_cnt, 0); | |
202 | INIT_LIST_HEAD(&qobj->qobj_list); | |
203 | init_waitqueue_head(&qobj->thread_wq); | |
204 | spin_lock_init(&qobj->cmd_queue_lock); | |
205 | } | |
c66ac9db | 206 | |
dbc5623e | 207 | void transport_subsystem_check_init(void) |
c66ac9db NB |
208 | { |
209 | int ret; | |
210 | ||
dbc5623e NB |
211 | if (sub_api_initialized) |
212 | return; | |
213 | ||
c66ac9db NB |
214 | ret = request_module("target_core_iblock"); |
215 | if (ret != 0) | |
6708bb27 | 216 | pr_err("Unable to load target_core_iblock\n"); |
c66ac9db NB |
217 | |
218 | ret = request_module("target_core_file"); | |
219 | if (ret != 0) | |
6708bb27 | 220 | pr_err("Unable to load target_core_file\n"); |
c66ac9db NB |
221 | |
222 | ret = request_module("target_core_pscsi"); | |
223 | if (ret != 0) | |
6708bb27 | 224 | pr_err("Unable to load target_core_pscsi\n"); |
c66ac9db NB |
225 | |
226 | ret = request_module("target_core_stgt"); | |
227 | if (ret != 0) | |
6708bb27 | 228 | pr_err("Unable to load target_core_stgt\n"); |
c66ac9db | 229 | |
e3d6f909 | 230 | sub_api_initialized = 1; |
dbc5623e | 231 | return; |
c66ac9db NB |
232 | } |
233 | ||
234 | struct se_session *transport_init_session(void) | |
235 | { | |
236 | struct se_session *se_sess; | |
237 | ||
238 | se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL); | |
6708bb27 AG |
239 | if (!se_sess) { |
240 | pr_err("Unable to allocate struct se_session from" | |
c66ac9db NB |
241 | " se_sess_cache\n"); |
242 | return ERR_PTR(-ENOMEM); | |
243 | } | |
244 | INIT_LIST_HEAD(&se_sess->sess_list); | |
245 | INIT_LIST_HEAD(&se_sess->sess_acl_list); | |
a17f091d NB |
246 | INIT_LIST_HEAD(&se_sess->sess_cmd_list); |
247 | INIT_LIST_HEAD(&se_sess->sess_wait_list); | |
248 | spin_lock_init(&se_sess->sess_cmd_lock); | |
c66ac9db NB |
249 | |
250 | return se_sess; | |
251 | } | |
252 | EXPORT_SYMBOL(transport_init_session); | |
253 | ||
254 | /* | |
255 | * Called with spin_lock_bh(&struct se_portal_group->session_lock called. | |
256 | */ | |
257 | void __transport_register_session( | |
258 | struct se_portal_group *se_tpg, | |
259 | struct se_node_acl *se_nacl, | |
260 | struct se_session *se_sess, | |
261 | void *fabric_sess_ptr) | |
262 | { | |
263 | unsigned char buf[PR_REG_ISID_LEN]; | |
264 | ||
265 | se_sess->se_tpg = se_tpg; | |
266 | se_sess->fabric_sess_ptr = fabric_sess_ptr; | |
267 | /* | |
268 | * Used by struct se_node_acl's under ConfigFS to locate active se_session-t | |
269 | * | |
270 | * Only set for struct se_session's that will actually be moving I/O. | |
271 | * eg: *NOT* discovery sessions. | |
272 | */ | |
273 | if (se_nacl) { | |
274 | /* | |
275 | * If the fabric module supports an ISID based TransportID, | |
276 | * save this value in binary from the fabric I_T Nexus now. | |
277 | */ | |
e3d6f909 | 278 | if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { |
c66ac9db | 279 | memset(&buf[0], 0, PR_REG_ISID_LEN); |
e3d6f909 | 280 | se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, |
c66ac9db NB |
281 | &buf[0], PR_REG_ISID_LEN); |
282 | se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]); | |
283 | } | |
284 | spin_lock_irq(&se_nacl->nacl_sess_lock); | |
285 | /* | |
286 | * The se_nacl->nacl_sess pointer will be set to the | |
287 | * last active I_T Nexus for each struct se_node_acl. | |
288 | */ | |
289 | se_nacl->nacl_sess = se_sess; | |
290 | ||
291 | list_add_tail(&se_sess->sess_acl_list, | |
292 | &se_nacl->acl_sess_list); | |
293 | spin_unlock_irq(&se_nacl->nacl_sess_lock); | |
294 | } | |
295 | list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list); | |
296 | ||
6708bb27 | 297 | pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n", |
e3d6f909 | 298 | se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr); |
c66ac9db NB |
299 | } |
300 | EXPORT_SYMBOL(__transport_register_session); | |
301 | ||
302 | void transport_register_session( | |
303 | struct se_portal_group *se_tpg, | |
304 | struct se_node_acl *se_nacl, | |
305 | struct se_session *se_sess, | |
306 | void *fabric_sess_ptr) | |
307 | { | |
308 | spin_lock_bh(&se_tpg->session_lock); | |
309 | __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr); | |
310 | spin_unlock_bh(&se_tpg->session_lock); | |
311 | } | |
312 | EXPORT_SYMBOL(transport_register_session); | |
313 | ||
314 | void transport_deregister_session_configfs(struct se_session *se_sess) | |
315 | { | |
316 | struct se_node_acl *se_nacl; | |
23388864 | 317 | unsigned long flags; |
c66ac9db NB |
318 | /* |
319 | * Used by struct se_node_acl's under ConfigFS to locate active struct se_session | |
320 | */ | |
321 | se_nacl = se_sess->se_node_acl; | |
6708bb27 | 322 | if (se_nacl) { |
23388864 | 323 | spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags); |
c66ac9db NB |
324 | list_del(&se_sess->sess_acl_list); |
325 | /* | |
326 | * If the session list is empty, then clear the pointer. | |
327 | * Otherwise, set the struct se_session pointer from the tail | |
328 | * element of the per struct se_node_acl active session list. | |
329 | */ | |
330 | if (list_empty(&se_nacl->acl_sess_list)) | |
331 | se_nacl->nacl_sess = NULL; | |
332 | else { | |
333 | se_nacl->nacl_sess = container_of( | |
334 | se_nacl->acl_sess_list.prev, | |
335 | struct se_session, sess_acl_list); | |
336 | } | |
23388864 | 337 | spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags); |
c66ac9db NB |
338 | } |
339 | } | |
340 | EXPORT_SYMBOL(transport_deregister_session_configfs); | |
341 | ||
342 | void transport_free_session(struct se_session *se_sess) | |
343 | { | |
344 | kmem_cache_free(se_sess_cache, se_sess); | |
345 | } | |
346 | EXPORT_SYMBOL(transport_free_session); | |
347 | ||
348 | void transport_deregister_session(struct se_session *se_sess) | |
349 | { | |
350 | struct se_portal_group *se_tpg = se_sess->se_tpg; | |
351 | struct se_node_acl *se_nacl; | |
e63a8e19 | 352 | unsigned long flags; |
c66ac9db | 353 | |
6708bb27 | 354 | if (!se_tpg) { |
c66ac9db NB |
355 | transport_free_session(se_sess); |
356 | return; | |
357 | } | |
c66ac9db | 358 | |
e63a8e19 | 359 | spin_lock_irqsave(&se_tpg->session_lock, flags); |
c66ac9db NB |
360 | list_del(&se_sess->sess_list); |
361 | se_sess->se_tpg = NULL; | |
362 | se_sess->fabric_sess_ptr = NULL; | |
e63a8e19 | 363 | spin_unlock_irqrestore(&se_tpg->session_lock, flags); |
c66ac9db NB |
364 | |
365 | /* | |
366 | * Determine if we need to do extra work for this initiator node's | |
367 | * struct se_node_acl if it had been previously dynamically generated. | |
368 | */ | |
369 | se_nacl = se_sess->se_node_acl; | |
6708bb27 | 370 | if (se_nacl) { |
e63a8e19 | 371 | spin_lock_irqsave(&se_tpg->acl_node_lock, flags); |
c66ac9db | 372 | if (se_nacl->dynamic_node_acl) { |
6708bb27 AG |
373 | if (!se_tpg->se_tpg_tfo->tpg_check_demo_mode_cache( |
374 | se_tpg)) { | |
c66ac9db NB |
375 | list_del(&se_nacl->acl_list); |
376 | se_tpg->num_node_acls--; | |
e63a8e19 | 377 | spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags); |
c66ac9db NB |
378 | |
379 | core_tpg_wait_for_nacl_pr_ref(se_nacl); | |
c66ac9db | 380 | core_free_device_list_for_node(se_nacl, se_tpg); |
e3d6f909 | 381 | se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg, |
c66ac9db | 382 | se_nacl); |
e63a8e19 | 383 | spin_lock_irqsave(&se_tpg->acl_node_lock, flags); |
c66ac9db NB |
384 | } |
385 | } | |
e63a8e19 | 386 | spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags); |
c66ac9db NB |
387 | } |
388 | ||
389 | transport_free_session(se_sess); | |
390 | ||
6708bb27 | 391 | pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n", |
e3d6f909 | 392 | se_tpg->se_tpg_tfo->get_fabric_name()); |
c66ac9db NB |
393 | } |
394 | EXPORT_SYMBOL(transport_deregister_session); | |
395 | ||
396 | /* | |
a1d8b49a | 397 | * Called with cmd->t_state_lock held. |
c66ac9db NB |
398 | */ |
399 | static void transport_all_task_dev_remove_state(struct se_cmd *cmd) | |
400 | { | |
42bf829e | 401 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
402 | struct se_task *task; |
403 | unsigned long flags; | |
404 | ||
42bf829e CH |
405 | if (!dev) |
406 | return; | |
c66ac9db | 407 | |
42bf829e | 408 | list_for_each_entry(task, &cmd->t_task_list, t_list) { |
6c76bf95 | 409 | if (task->task_flags & TF_ACTIVE) |
c66ac9db NB |
410 | continue; |
411 | ||
c66ac9db | 412 | spin_lock_irqsave(&dev->execute_task_lock, flags); |
1880807a CH |
413 | if (task->t_state_active) { |
414 | pr_debug("Removed ITT: 0x%08x dev: %p task[%p]\n", | |
415 | cmd->se_tfo->get_task_tag(cmd), dev, task); | |
c66ac9db | 416 | |
1880807a CH |
417 | list_del(&task->t_state_list); |
418 | atomic_dec(&cmd->t_task_cdbs_ex_left); | |
419 | task->t_state_active = false; | |
420 | } | |
421 | spin_unlock_irqrestore(&dev->execute_task_lock, flags); | |
c66ac9db | 422 | } |
1880807a | 423 | |
c66ac9db NB |
424 | } |
425 | ||
426 | /* transport_cmd_check_stop(): | |
427 | * | |
7d680f3b | 428 | * 'transport_off = 1' determines if CMD_T_ACTIVE should be cleared. |
c66ac9db NB |
429 | * 'transport_off = 2' determines if task_dev_state should be removed. |
430 | * | |
431 | * A non-zero u8 t_state sets cmd->t_state. | |
432 | * Returns 1 when command is stopped, else 0. | |
433 | */ | |
434 | static int transport_cmd_check_stop( | |
435 | struct se_cmd *cmd, | |
436 | int transport_off, | |
437 | u8 t_state) | |
438 | { | |
439 | unsigned long flags; | |
440 | ||
a1d8b49a | 441 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db NB |
442 | /* |
443 | * Determine if IOCTL context caller in requesting the stopping of this | |
444 | * command for LUN shutdown purposes. | |
445 | */ | |
7d680f3b CH |
446 | if (cmd->transport_state & CMD_T_LUN_STOP) { |
447 | pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n", | |
448 | __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd)); | |
c66ac9db | 449 | |
7d680f3b | 450 | cmd->transport_state &= ~CMD_T_ACTIVE; |
c66ac9db NB |
451 | if (transport_off == 2) |
452 | transport_all_task_dev_remove_state(cmd); | |
a1d8b49a | 453 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 454 | |
a1d8b49a | 455 | complete(&cmd->transport_lun_stop_comp); |
c66ac9db NB |
456 | return 1; |
457 | } | |
458 | /* | |
459 | * Determine if frontend context caller is requesting the stopping of | |
e3d6f909 | 460 | * this command for frontend exceptions. |
c66ac9db | 461 | */ |
7d680f3b CH |
462 | if (cmd->transport_state & CMD_T_STOP) { |
463 | pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n", | |
464 | __func__, __LINE__, | |
e3d6f909 | 465 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 466 | |
c66ac9db NB |
467 | if (transport_off == 2) |
468 | transport_all_task_dev_remove_state(cmd); | |
469 | ||
470 | /* | |
471 | * Clear struct se_cmd->se_lun before the transport_off == 2 handoff | |
472 | * to FE. | |
473 | */ | |
474 | if (transport_off == 2) | |
475 | cmd->se_lun = NULL; | |
a1d8b49a | 476 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 477 | |
a1d8b49a | 478 | complete(&cmd->t_transport_stop_comp); |
c66ac9db NB |
479 | return 1; |
480 | } | |
481 | if (transport_off) { | |
7d680f3b | 482 | cmd->transport_state &= ~CMD_T_ACTIVE; |
c66ac9db NB |
483 | if (transport_off == 2) { |
484 | transport_all_task_dev_remove_state(cmd); | |
485 | /* | |
486 | * Clear struct se_cmd->se_lun before the transport_off == 2 | |
487 | * handoff to fabric module. | |
488 | */ | |
489 | cmd->se_lun = NULL; | |
490 | /* | |
491 | * Some fabric modules like tcm_loop can release | |
25985edc | 492 | * their internally allocated I/O reference now and |
c66ac9db | 493 | * struct se_cmd now. |
88dd9e26 NB |
494 | * |
495 | * Fabric modules are expected to return '1' here if the | |
496 | * se_cmd being passed is released at this point, | |
497 | * or zero if not being released. | |
c66ac9db | 498 | */ |
e3d6f909 | 499 | if (cmd->se_tfo->check_stop_free != NULL) { |
c66ac9db | 500 | spin_unlock_irqrestore( |
a1d8b49a | 501 | &cmd->t_state_lock, flags); |
c66ac9db | 502 | |
88dd9e26 | 503 | return cmd->se_tfo->check_stop_free(cmd); |
c66ac9db NB |
504 | } |
505 | } | |
a1d8b49a | 506 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
507 | |
508 | return 0; | |
509 | } else if (t_state) | |
510 | cmd->t_state = t_state; | |
a1d8b49a | 511 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
512 | |
513 | return 0; | |
514 | } | |
515 | ||
516 | static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd) | |
517 | { | |
518 | return transport_cmd_check_stop(cmd, 2, 0); | |
519 | } | |
520 | ||
521 | static void transport_lun_remove_cmd(struct se_cmd *cmd) | |
522 | { | |
e3d6f909 | 523 | struct se_lun *lun = cmd->se_lun; |
c66ac9db NB |
524 | unsigned long flags; |
525 | ||
526 | if (!lun) | |
527 | return; | |
528 | ||
a1d8b49a | 529 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
7d680f3b CH |
530 | if (cmd->transport_state & CMD_T_DEV_ACTIVE) { |
531 | cmd->transport_state &= ~CMD_T_DEV_ACTIVE; | |
532 | transport_all_task_dev_remove_state(cmd); | |
c66ac9db | 533 | } |
a1d8b49a | 534 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 535 | |
c66ac9db | 536 | spin_lock_irqsave(&lun->lun_cmd_lock, flags); |
3d26fea0 CH |
537 | if (!list_empty(&cmd->se_lun_node)) |
538 | list_del_init(&cmd->se_lun_node); | |
c66ac9db NB |
539 | spin_unlock_irqrestore(&lun->lun_cmd_lock, flags); |
540 | } | |
541 | ||
542 | void transport_cmd_finish_abort(struct se_cmd *cmd, int remove) | |
543 | { | |
c8e31f26 | 544 | if (!(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) |
8dc52b54 | 545 | transport_lun_remove_cmd(cmd); |
c66ac9db NB |
546 | |
547 | if (transport_cmd_check_stop_to_fabric(cmd)) | |
548 | return; | |
77039d1e | 549 | if (remove) { |
3df8d40b | 550 | transport_remove_cmd_from_queue(cmd); |
e6a2573f | 551 | transport_put_cmd(cmd); |
77039d1e | 552 | } |
c66ac9db NB |
553 | } |
554 | ||
f7a5cc0b CH |
555 | static void transport_add_cmd_to_queue(struct se_cmd *cmd, int t_state, |
556 | bool at_head) | |
c66ac9db NB |
557 | { |
558 | struct se_device *dev = cmd->se_dev; | |
e3d6f909 | 559 | struct se_queue_obj *qobj = &dev->dev_queue_obj; |
c66ac9db NB |
560 | unsigned long flags; |
561 | ||
c66ac9db | 562 | if (t_state) { |
a1d8b49a | 563 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 564 | cmd->t_state = t_state; |
7d680f3b | 565 | cmd->transport_state |= CMD_T_ACTIVE; |
a1d8b49a | 566 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
567 | } |
568 | ||
569 | spin_lock_irqsave(&qobj->cmd_queue_lock, flags); | |
79a7fef2 RD |
570 | |
571 | /* If the cmd is already on the list, remove it before we add it */ | |
572 | if (!list_empty(&cmd->se_queue_node)) | |
573 | list_del(&cmd->se_queue_node); | |
574 | else | |
575 | atomic_inc(&qobj->queue_cnt); | |
576 | ||
f7a5cc0b | 577 | if (at_head) |
07bde79a | 578 | list_add(&cmd->se_queue_node, &qobj->qobj_list); |
f7a5cc0b | 579 | else |
07bde79a | 580 | list_add_tail(&cmd->se_queue_node, &qobj->qobj_list); |
7d680f3b | 581 | cmd->transport_state |= CMD_T_QUEUED; |
c66ac9db NB |
582 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); |
583 | ||
c66ac9db | 584 | wake_up_interruptible(&qobj->thread_wq); |
c66ac9db NB |
585 | } |
586 | ||
5951146d AG |
587 | static struct se_cmd * |
588 | transport_get_cmd_from_queue(struct se_queue_obj *qobj) | |
c66ac9db | 589 | { |
5951146d | 590 | struct se_cmd *cmd; |
c66ac9db NB |
591 | unsigned long flags; |
592 | ||
593 | spin_lock_irqsave(&qobj->cmd_queue_lock, flags); | |
594 | if (list_empty(&qobj->qobj_list)) { | |
595 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); | |
596 | return NULL; | |
597 | } | |
5951146d | 598 | cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node); |
c66ac9db | 599 | |
7d680f3b | 600 | cmd->transport_state &= ~CMD_T_QUEUED; |
79a7fef2 | 601 | list_del_init(&cmd->se_queue_node); |
c66ac9db NB |
602 | atomic_dec(&qobj->queue_cnt); |
603 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); | |
604 | ||
5951146d | 605 | return cmd; |
c66ac9db NB |
606 | } |
607 | ||
3df8d40b | 608 | static void transport_remove_cmd_from_queue(struct se_cmd *cmd) |
c66ac9db | 609 | { |
3df8d40b | 610 | struct se_queue_obj *qobj = &cmd->se_dev->dev_queue_obj; |
c66ac9db NB |
611 | unsigned long flags; |
612 | ||
613 | spin_lock_irqsave(&qobj->cmd_queue_lock, flags); | |
7d680f3b | 614 | if (!(cmd->transport_state & CMD_T_QUEUED)) { |
c66ac9db NB |
615 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); |
616 | return; | |
617 | } | |
7d680f3b | 618 | cmd->transport_state &= ~CMD_T_QUEUED; |
79a7fef2 RD |
619 | atomic_dec(&qobj->queue_cnt); |
620 | list_del_init(&cmd->se_queue_node); | |
c66ac9db | 621 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); |
c66ac9db NB |
622 | } |
623 | ||
624 | /* | |
625 | * Completion function used by TCM subsystem plugins (such as FILEIO) | |
626 | * for queueing up response from struct se_subsystem_api->do_task() | |
627 | */ | |
628 | void transport_complete_sync_cache(struct se_cmd *cmd, int good) | |
629 | { | |
a1d8b49a | 630 | struct se_task *task = list_entry(cmd->t_task_list.next, |
c66ac9db NB |
631 | struct se_task, t_list); |
632 | ||
633 | if (good) { | |
634 | cmd->scsi_status = SAM_STAT_GOOD; | |
635 | task->task_scsi_status = GOOD; | |
636 | } else { | |
637 | task->task_scsi_status = SAM_STAT_CHECK_CONDITION; | |
03e98c9e NB |
638 | task->task_se_cmd->scsi_sense_reason = |
639 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
640 | ||
c66ac9db NB |
641 | } |
642 | ||
643 | transport_complete_task(task, good); | |
644 | } | |
645 | EXPORT_SYMBOL(transport_complete_sync_cache); | |
646 | ||
35e0e757 CH |
647 | static void target_complete_failure_work(struct work_struct *work) |
648 | { | |
649 | struct se_cmd *cmd = container_of(work, struct se_cmd, work); | |
650 | ||
03e98c9e | 651 | transport_generic_request_failure(cmd); |
35e0e757 CH |
652 | } |
653 | ||
c66ac9db NB |
654 | /* transport_complete_task(): |
655 | * | |
656 | * Called from interrupt and non interrupt context depending | |
657 | * on the transport plugin. | |
658 | */ | |
659 | void transport_complete_task(struct se_task *task, int success) | |
660 | { | |
e3d6f909 | 661 | struct se_cmd *cmd = task->task_se_cmd; |
42bf829e | 662 | struct se_device *dev = cmd->se_dev; |
c66ac9db | 663 | unsigned long flags; |
c66ac9db | 664 | |
a1d8b49a | 665 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
6c76bf95 | 666 | task->task_flags &= ~TF_ACTIVE; |
c66ac9db NB |
667 | |
668 | /* | |
669 | * See if any sense data exists, if so set the TASK_SENSE flag. | |
670 | * Also check for any other post completion work that needs to be | |
671 | * done by the plugins. | |
672 | */ | |
673 | if (dev && dev->transport->transport_complete) { | |
674 | if (dev->transport->transport_complete(task) != 0) { | |
675 | cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE; | |
ef804a84 | 676 | task->task_flags |= TF_HAS_SENSE; |
c66ac9db NB |
677 | success = 1; |
678 | } | |
679 | } | |
680 | ||
681 | /* | |
682 | * See if we are waiting for outstanding struct se_task | |
683 | * to complete for an exception condition | |
684 | */ | |
6c76bf95 | 685 | if (task->task_flags & TF_REQUEST_STOP) { |
a1d8b49a | 686 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
687 | complete(&task->task_stop_comp); |
688 | return; | |
689 | } | |
2235007c CH |
690 | |
691 | if (!success) | |
7d680f3b | 692 | cmd->transport_state |= CMD_T_FAILED; |
2235007c | 693 | |
c66ac9db NB |
694 | /* |
695 | * Decrement the outstanding t_task_cdbs_left count. The last | |
696 | * struct se_task from struct se_cmd will complete itself into the | |
697 | * device queue depending upon int success. | |
698 | */ | |
6708bb27 | 699 | if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) { |
a1d8b49a | 700 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
701 | return; |
702 | } | |
3d28934a NB |
703 | /* |
704 | * Check for case where an explict ABORT_TASK has been received | |
705 | * and transport_wait_for_tasks() will be waiting for completion.. | |
706 | */ | |
707 | if (cmd->transport_state & CMD_T_ABORTED && | |
708 | cmd->transport_state & CMD_T_STOP) { | |
709 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
710 | complete(&cmd->t_transport_stop_comp); | |
711 | return; | |
712 | } else if (cmd->transport_state & CMD_T_FAILED) { | |
41e16e98 | 713 | cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
35e0e757 | 714 | INIT_WORK(&cmd->work, target_complete_failure_work); |
c66ac9db | 715 | } else { |
35e0e757 | 716 | INIT_WORK(&cmd->work, target_complete_ok_work); |
c66ac9db | 717 | } |
35e0e757 | 718 | |
35e0e757 | 719 | cmd->t_state = TRANSPORT_COMPLETE; |
3d28934a | 720 | cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE); |
a1d8b49a | 721 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 722 | |
35e0e757 | 723 | queue_work(target_completion_wq, &cmd->work); |
c66ac9db NB |
724 | } |
725 | EXPORT_SYMBOL(transport_complete_task); | |
726 | ||
727 | /* | |
728 | * Called by transport_add_tasks_from_cmd() once a struct se_cmd's | |
729 | * struct se_task list are ready to be added to the active execution list | |
730 | * struct se_device | |
731 | ||
732 | * Called with se_dev_t->execute_task_lock called. | |
733 | */ | |
734 | static inline int transport_add_task_check_sam_attr( | |
735 | struct se_task *task, | |
736 | struct se_task *task_prev, | |
737 | struct se_device *dev) | |
738 | { | |
739 | /* | |
740 | * No SAM Task attribute emulation enabled, add to tail of | |
741 | * execution queue | |
742 | */ | |
743 | if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) { | |
744 | list_add_tail(&task->t_execute_list, &dev->execute_task_list); | |
745 | return 0; | |
746 | } | |
747 | /* | |
748 | * HEAD_OF_QUEUE attribute for received CDB, which means | |
749 | * the first task that is associated with a struct se_cmd goes to | |
750 | * head of the struct se_device->execute_task_list, and task_prev | |
751 | * after that for each subsequent task | |
752 | */ | |
e66ecd50 | 753 | if (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG) { |
c66ac9db NB |
754 | list_add(&task->t_execute_list, |
755 | (task_prev != NULL) ? | |
756 | &task_prev->t_execute_list : | |
757 | &dev->execute_task_list); | |
758 | ||
6708bb27 | 759 | pr_debug("Set HEAD_OF_QUEUE for task CDB: 0x%02x" |
c66ac9db | 760 | " in execution queue\n", |
6708bb27 | 761 | task->task_se_cmd->t_task_cdb[0]); |
c66ac9db NB |
762 | return 1; |
763 | } | |
764 | /* | |
765 | * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been | |
766 | * transitioned from Dermant -> Active state, and are added to the end | |
767 | * of the struct se_device->execute_task_list | |
768 | */ | |
769 | list_add_tail(&task->t_execute_list, &dev->execute_task_list); | |
770 | return 0; | |
771 | } | |
772 | ||
773 | /* __transport_add_task_to_execute_queue(): | |
774 | * | |
775 | * Called with se_dev_t->execute_task_lock called. | |
776 | */ | |
777 | static void __transport_add_task_to_execute_queue( | |
778 | struct se_task *task, | |
779 | struct se_task *task_prev, | |
780 | struct se_device *dev) | |
781 | { | |
782 | int head_of_queue; | |
783 | ||
784 | head_of_queue = transport_add_task_check_sam_attr(task, task_prev, dev); | |
785 | atomic_inc(&dev->execute_tasks); | |
786 | ||
1880807a | 787 | if (task->t_state_active) |
c66ac9db NB |
788 | return; |
789 | /* | |
790 | * Determine if this task needs to go to HEAD_OF_QUEUE for the | |
791 | * state list as well. Running with SAM Task Attribute emulation | |
792 | * will always return head_of_queue == 0 here | |
793 | */ | |
794 | if (head_of_queue) | |
795 | list_add(&task->t_state_list, (task_prev) ? | |
796 | &task_prev->t_state_list : | |
797 | &dev->state_task_list); | |
798 | else | |
799 | list_add_tail(&task->t_state_list, &dev->state_task_list); | |
800 | ||
1880807a | 801 | task->t_state_active = true; |
c66ac9db | 802 | |
6708bb27 | 803 | pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n", |
e3d6f909 | 804 | task->task_se_cmd->se_tfo->get_task_tag(task->task_se_cmd), |
c66ac9db NB |
805 | task, dev); |
806 | } | |
807 | ||
808 | static void transport_add_tasks_to_state_queue(struct se_cmd *cmd) | |
809 | { | |
42bf829e | 810 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
811 | struct se_task *task; |
812 | unsigned long flags; | |
813 | ||
a1d8b49a AG |
814 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
815 | list_for_each_entry(task, &cmd->t_task_list, t_list) { | |
c66ac9db | 816 | spin_lock(&dev->execute_task_lock); |
1880807a CH |
817 | if (!task->t_state_active) { |
818 | list_add_tail(&task->t_state_list, | |
819 | &dev->state_task_list); | |
820 | task->t_state_active = true; | |
821 | ||
822 | pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n", | |
823 | task->task_se_cmd->se_tfo->get_task_tag( | |
824 | task->task_se_cmd), task, dev); | |
825 | } | |
c66ac9db NB |
826 | spin_unlock(&dev->execute_task_lock); |
827 | } | |
a1d8b49a | 828 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
829 | } |
830 | ||
4d2300cc | 831 | static void __transport_add_tasks_from_cmd(struct se_cmd *cmd) |
c66ac9db | 832 | { |
5951146d | 833 | struct se_device *dev = cmd->se_dev; |
c66ac9db | 834 | struct se_task *task, *task_prev = NULL; |
c66ac9db | 835 | |
a1d8b49a | 836 | list_for_each_entry(task, &cmd->t_task_list, t_list) { |
04629b7b | 837 | if (!list_empty(&task->t_execute_list)) |
c66ac9db NB |
838 | continue; |
839 | /* | |
840 | * __transport_add_task_to_execute_queue() handles the | |
841 | * SAM Task Attribute emulation if enabled | |
842 | */ | |
843 | __transport_add_task_to_execute_queue(task, task_prev, dev); | |
c66ac9db NB |
844 | task_prev = task; |
845 | } | |
4d2300cc NB |
846 | } |
847 | ||
848 | static void transport_add_tasks_from_cmd(struct se_cmd *cmd) | |
849 | { | |
850 | unsigned long flags; | |
851 | struct se_device *dev = cmd->se_dev; | |
852 | ||
853 | spin_lock_irqsave(&dev->execute_task_lock, flags); | |
854 | __transport_add_tasks_from_cmd(cmd); | |
c66ac9db | 855 | spin_unlock_irqrestore(&dev->execute_task_lock, flags); |
c66ac9db NB |
856 | } |
857 | ||
04629b7b CH |
858 | void __transport_remove_task_from_execute_queue(struct se_task *task, |
859 | struct se_device *dev) | |
860 | { | |
861 | list_del_init(&task->t_execute_list); | |
862 | atomic_dec(&dev->execute_tasks); | |
863 | } | |
864 | ||
e26d99ae | 865 | static void transport_remove_task_from_execute_queue( |
c66ac9db NB |
866 | struct se_task *task, |
867 | struct se_device *dev) | |
868 | { | |
869 | unsigned long flags; | |
870 | ||
04629b7b | 871 | if (WARN_ON(list_empty(&task->t_execute_list))) |
af57c3ac | 872 | return; |
af57c3ac | 873 | |
c66ac9db | 874 | spin_lock_irqsave(&dev->execute_task_lock, flags); |
04629b7b | 875 | __transport_remove_task_from_execute_queue(task, dev); |
c66ac9db NB |
876 | spin_unlock_irqrestore(&dev->execute_task_lock, flags); |
877 | } | |
878 | ||
07bde79a | 879 | /* |
f147abb4 | 880 | * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status |
07bde79a NB |
881 | */ |
882 | ||
883 | static void target_qf_do_work(struct work_struct *work) | |
884 | { | |
885 | struct se_device *dev = container_of(work, struct se_device, | |
886 | qf_work_queue); | |
bcac364a | 887 | LIST_HEAD(qf_cmd_list); |
07bde79a NB |
888 | struct se_cmd *cmd, *cmd_tmp; |
889 | ||
890 | spin_lock_irq(&dev->qf_cmd_lock); | |
bcac364a RD |
891 | list_splice_init(&dev->qf_cmd_list, &qf_cmd_list); |
892 | spin_unlock_irq(&dev->qf_cmd_lock); | |
07bde79a | 893 | |
bcac364a | 894 | list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) { |
07bde79a NB |
895 | list_del(&cmd->se_qf_node); |
896 | atomic_dec(&dev->dev_qf_count); | |
897 | smp_mb__after_atomic_dec(); | |
07bde79a | 898 | |
6708bb27 | 899 | pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue" |
07bde79a | 900 | " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd, |
e057f533 | 901 | (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" : |
07bde79a NB |
902 | (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING" |
903 | : "UNKNOWN"); | |
f7a5cc0b CH |
904 | |
905 | transport_add_cmd_to_queue(cmd, cmd->t_state, true); | |
07bde79a | 906 | } |
07bde79a NB |
907 | } |
908 | ||
c66ac9db NB |
909 | unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd) |
910 | { | |
911 | switch (cmd->data_direction) { | |
912 | case DMA_NONE: | |
913 | return "NONE"; | |
914 | case DMA_FROM_DEVICE: | |
915 | return "READ"; | |
916 | case DMA_TO_DEVICE: | |
917 | return "WRITE"; | |
918 | case DMA_BIDIRECTIONAL: | |
919 | return "BIDI"; | |
920 | default: | |
921 | break; | |
922 | } | |
923 | ||
924 | return "UNKNOWN"; | |
925 | } | |
926 | ||
927 | void transport_dump_dev_state( | |
928 | struct se_device *dev, | |
929 | char *b, | |
930 | int *bl) | |
931 | { | |
932 | *bl += sprintf(b + *bl, "Status: "); | |
933 | switch (dev->dev_status) { | |
934 | case TRANSPORT_DEVICE_ACTIVATED: | |
935 | *bl += sprintf(b + *bl, "ACTIVATED"); | |
936 | break; | |
937 | case TRANSPORT_DEVICE_DEACTIVATED: | |
938 | *bl += sprintf(b + *bl, "DEACTIVATED"); | |
939 | break; | |
940 | case TRANSPORT_DEVICE_SHUTDOWN: | |
941 | *bl += sprintf(b + *bl, "SHUTDOWN"); | |
942 | break; | |
943 | case TRANSPORT_DEVICE_OFFLINE_ACTIVATED: | |
944 | case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED: | |
945 | *bl += sprintf(b + *bl, "OFFLINE"); | |
946 | break; | |
947 | default: | |
948 | *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status); | |
949 | break; | |
950 | } | |
951 | ||
65586d51 NB |
952 | *bl += sprintf(b + *bl, " Execute/Max Queue Depth: %d/%d", |
953 | atomic_read(&dev->execute_tasks), dev->queue_depth); | |
c66ac9db | 954 | *bl += sprintf(b + *bl, " SectorSize: %u MaxSectors: %u\n", |
e3d6f909 | 955 | dev->se_sub_dev->se_dev_attrib.block_size, dev->se_sub_dev->se_dev_attrib.max_sectors); |
c66ac9db NB |
956 | *bl += sprintf(b + *bl, " "); |
957 | } | |
958 | ||
c66ac9db NB |
959 | void transport_dump_vpd_proto_id( |
960 | struct t10_vpd *vpd, | |
961 | unsigned char *p_buf, | |
962 | int p_buf_len) | |
963 | { | |
964 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
965 | int len; | |
966 | ||
967 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
968 | len = sprintf(buf, "T10 VPD Protocol Identifier: "); | |
969 | ||
970 | switch (vpd->protocol_identifier) { | |
971 | case 0x00: | |
972 | sprintf(buf+len, "Fibre Channel\n"); | |
973 | break; | |
974 | case 0x10: | |
975 | sprintf(buf+len, "Parallel SCSI\n"); | |
976 | break; | |
977 | case 0x20: | |
978 | sprintf(buf+len, "SSA\n"); | |
979 | break; | |
980 | case 0x30: | |
981 | sprintf(buf+len, "IEEE 1394\n"); | |
982 | break; | |
983 | case 0x40: | |
984 | sprintf(buf+len, "SCSI Remote Direct Memory Access" | |
985 | " Protocol\n"); | |
986 | break; | |
987 | case 0x50: | |
988 | sprintf(buf+len, "Internet SCSI (iSCSI)\n"); | |
989 | break; | |
990 | case 0x60: | |
991 | sprintf(buf+len, "SAS Serial SCSI Protocol\n"); | |
992 | break; | |
993 | case 0x70: | |
994 | sprintf(buf+len, "Automation/Drive Interface Transport" | |
995 | " Protocol\n"); | |
996 | break; | |
997 | case 0x80: | |
998 | sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n"); | |
999 | break; | |
1000 | default: | |
1001 | sprintf(buf+len, "Unknown 0x%02x\n", | |
1002 | vpd->protocol_identifier); | |
1003 | break; | |
1004 | } | |
1005 | ||
1006 | if (p_buf) | |
1007 | strncpy(p_buf, buf, p_buf_len); | |
1008 | else | |
6708bb27 | 1009 | pr_debug("%s", buf); |
c66ac9db NB |
1010 | } |
1011 | ||
1012 | void | |
1013 | transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83) | |
1014 | { | |
1015 | /* | |
1016 | * Check if the Protocol Identifier Valid (PIV) bit is set.. | |
1017 | * | |
1018 | * from spc3r23.pdf section 7.5.1 | |
1019 | */ | |
1020 | if (page_83[1] & 0x80) { | |
1021 | vpd->protocol_identifier = (page_83[0] & 0xf0); | |
1022 | vpd->protocol_identifier_set = 1; | |
1023 | transport_dump_vpd_proto_id(vpd, NULL, 0); | |
1024 | } | |
1025 | } | |
1026 | EXPORT_SYMBOL(transport_set_vpd_proto_id); | |
1027 | ||
1028 | int transport_dump_vpd_assoc( | |
1029 | struct t10_vpd *vpd, | |
1030 | unsigned char *p_buf, | |
1031 | int p_buf_len) | |
1032 | { | |
1033 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
e3d6f909 AG |
1034 | int ret = 0; |
1035 | int len; | |
c66ac9db NB |
1036 | |
1037 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
1038 | len = sprintf(buf, "T10 VPD Identifier Association: "); | |
1039 | ||
1040 | switch (vpd->association) { | |
1041 | case 0x00: | |
1042 | sprintf(buf+len, "addressed logical unit\n"); | |
1043 | break; | |
1044 | case 0x10: | |
1045 | sprintf(buf+len, "target port\n"); | |
1046 | break; | |
1047 | case 0x20: | |
1048 | sprintf(buf+len, "SCSI target device\n"); | |
1049 | break; | |
1050 | default: | |
1051 | sprintf(buf+len, "Unknown 0x%02x\n", vpd->association); | |
e3d6f909 | 1052 | ret = -EINVAL; |
c66ac9db NB |
1053 | break; |
1054 | } | |
1055 | ||
1056 | if (p_buf) | |
1057 | strncpy(p_buf, buf, p_buf_len); | |
1058 | else | |
6708bb27 | 1059 | pr_debug("%s", buf); |
c66ac9db NB |
1060 | |
1061 | return ret; | |
1062 | } | |
1063 | ||
1064 | int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83) | |
1065 | { | |
1066 | /* | |
1067 | * The VPD identification association.. | |
1068 | * | |
1069 | * from spc3r23.pdf Section 7.6.3.1 Table 297 | |
1070 | */ | |
1071 | vpd->association = (page_83[1] & 0x30); | |
1072 | return transport_dump_vpd_assoc(vpd, NULL, 0); | |
1073 | } | |
1074 | EXPORT_SYMBOL(transport_set_vpd_assoc); | |
1075 | ||
1076 | int transport_dump_vpd_ident_type( | |
1077 | struct t10_vpd *vpd, | |
1078 | unsigned char *p_buf, | |
1079 | int p_buf_len) | |
1080 | { | |
1081 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
e3d6f909 AG |
1082 | int ret = 0; |
1083 | int len; | |
c66ac9db NB |
1084 | |
1085 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
1086 | len = sprintf(buf, "T10 VPD Identifier Type: "); | |
1087 | ||
1088 | switch (vpd->device_identifier_type) { | |
1089 | case 0x00: | |
1090 | sprintf(buf+len, "Vendor specific\n"); | |
1091 | break; | |
1092 | case 0x01: | |
1093 | sprintf(buf+len, "T10 Vendor ID based\n"); | |
1094 | break; | |
1095 | case 0x02: | |
1096 | sprintf(buf+len, "EUI-64 based\n"); | |
1097 | break; | |
1098 | case 0x03: | |
1099 | sprintf(buf+len, "NAA\n"); | |
1100 | break; | |
1101 | case 0x04: | |
1102 | sprintf(buf+len, "Relative target port identifier\n"); | |
1103 | break; | |
1104 | case 0x08: | |
1105 | sprintf(buf+len, "SCSI name string\n"); | |
1106 | break; | |
1107 | default: | |
1108 | sprintf(buf+len, "Unsupported: 0x%02x\n", | |
1109 | vpd->device_identifier_type); | |
e3d6f909 | 1110 | ret = -EINVAL; |
c66ac9db NB |
1111 | break; |
1112 | } | |
1113 | ||
e3d6f909 AG |
1114 | if (p_buf) { |
1115 | if (p_buf_len < strlen(buf)+1) | |
1116 | return -EINVAL; | |
c66ac9db | 1117 | strncpy(p_buf, buf, p_buf_len); |
e3d6f909 | 1118 | } else { |
6708bb27 | 1119 | pr_debug("%s", buf); |
e3d6f909 | 1120 | } |
c66ac9db NB |
1121 | |
1122 | return ret; | |
1123 | } | |
1124 | ||
1125 | int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83) | |
1126 | { | |
1127 | /* | |
1128 | * The VPD identifier type.. | |
1129 | * | |
1130 | * from spc3r23.pdf Section 7.6.3.1 Table 298 | |
1131 | */ | |
1132 | vpd->device_identifier_type = (page_83[1] & 0x0f); | |
1133 | return transport_dump_vpd_ident_type(vpd, NULL, 0); | |
1134 | } | |
1135 | EXPORT_SYMBOL(transport_set_vpd_ident_type); | |
1136 | ||
1137 | int transport_dump_vpd_ident( | |
1138 | struct t10_vpd *vpd, | |
1139 | unsigned char *p_buf, | |
1140 | int p_buf_len) | |
1141 | { | |
1142 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
1143 | int ret = 0; | |
1144 | ||
1145 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
1146 | ||
1147 | switch (vpd->device_identifier_code_set) { | |
1148 | case 0x01: /* Binary */ | |
1149 | sprintf(buf, "T10 VPD Binary Device Identifier: %s\n", | |
1150 | &vpd->device_identifier[0]); | |
1151 | break; | |
1152 | case 0x02: /* ASCII */ | |
1153 | sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n", | |
1154 | &vpd->device_identifier[0]); | |
1155 | break; | |
1156 | case 0x03: /* UTF-8 */ | |
1157 | sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n", | |
1158 | &vpd->device_identifier[0]); | |
1159 | break; | |
1160 | default: | |
1161 | sprintf(buf, "T10 VPD Device Identifier encoding unsupported:" | |
1162 | " 0x%02x", vpd->device_identifier_code_set); | |
e3d6f909 | 1163 | ret = -EINVAL; |
c66ac9db NB |
1164 | break; |
1165 | } | |
1166 | ||
1167 | if (p_buf) | |
1168 | strncpy(p_buf, buf, p_buf_len); | |
1169 | else | |
6708bb27 | 1170 | pr_debug("%s", buf); |
c66ac9db NB |
1171 | |
1172 | return ret; | |
1173 | } | |
1174 | ||
1175 | int | |
1176 | transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83) | |
1177 | { | |
1178 | static const char hex_str[] = "0123456789abcdef"; | |
1179 | int j = 0, i = 4; /* offset to start of the identifer */ | |
1180 | ||
1181 | /* | |
1182 | * The VPD Code Set (encoding) | |
1183 | * | |
1184 | * from spc3r23.pdf Section 7.6.3.1 Table 296 | |
1185 | */ | |
1186 | vpd->device_identifier_code_set = (page_83[0] & 0x0f); | |
1187 | switch (vpd->device_identifier_code_set) { | |
1188 | case 0x01: /* Binary */ | |
1189 | vpd->device_identifier[j++] = | |
1190 | hex_str[vpd->device_identifier_type]; | |
1191 | while (i < (4 + page_83[3])) { | |
1192 | vpd->device_identifier[j++] = | |
1193 | hex_str[(page_83[i] & 0xf0) >> 4]; | |
1194 | vpd->device_identifier[j++] = | |
1195 | hex_str[page_83[i] & 0x0f]; | |
1196 | i++; | |
1197 | } | |
1198 | break; | |
1199 | case 0x02: /* ASCII */ | |
1200 | case 0x03: /* UTF-8 */ | |
1201 | while (i < (4 + page_83[3])) | |
1202 | vpd->device_identifier[j++] = page_83[i++]; | |
1203 | break; | |
1204 | default: | |
1205 | break; | |
1206 | } | |
1207 | ||
1208 | return transport_dump_vpd_ident(vpd, NULL, 0); | |
1209 | } | |
1210 | EXPORT_SYMBOL(transport_set_vpd_ident); | |
1211 | ||
1212 | static void core_setup_task_attr_emulation(struct se_device *dev) | |
1213 | { | |
1214 | /* | |
1215 | * If this device is from Target_Core_Mod/pSCSI, disable the | |
1216 | * SAM Task Attribute emulation. | |
1217 | * | |
1218 | * This is currently not available in upsream Linux/SCSI Target | |
1219 | * mode code, and is assumed to be disabled while using TCM/pSCSI. | |
1220 | */ | |
e3d6f909 | 1221 | if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) { |
c66ac9db NB |
1222 | dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH; |
1223 | return; | |
1224 | } | |
1225 | ||
1226 | dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED; | |
6708bb27 | 1227 | pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x" |
e3d6f909 AG |
1228 | " device\n", dev->transport->name, |
1229 | dev->transport->get_device_rev(dev)); | |
c66ac9db NB |
1230 | } |
1231 | ||
1232 | static void scsi_dump_inquiry(struct se_device *dev) | |
1233 | { | |
e3d6f909 | 1234 | struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn; |
e59a41b6 | 1235 | char buf[17]; |
c66ac9db NB |
1236 | int i, device_type; |
1237 | /* | |
1238 | * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer | |
1239 | */ | |
c66ac9db NB |
1240 | for (i = 0; i < 8; i++) |
1241 | if (wwn->vendor[i] >= 0x20) | |
e59a41b6 | 1242 | buf[i] = wwn->vendor[i]; |
c66ac9db | 1243 | else |
e59a41b6 SAS |
1244 | buf[i] = ' '; |
1245 | buf[i] = '\0'; | |
1246 | pr_debug(" Vendor: %s\n", buf); | |
c66ac9db | 1247 | |
c66ac9db NB |
1248 | for (i = 0; i < 16; i++) |
1249 | if (wwn->model[i] >= 0x20) | |
e59a41b6 | 1250 | buf[i] = wwn->model[i]; |
c66ac9db | 1251 | else |
e59a41b6 SAS |
1252 | buf[i] = ' '; |
1253 | buf[i] = '\0'; | |
1254 | pr_debug(" Model: %s\n", buf); | |
c66ac9db | 1255 | |
c66ac9db NB |
1256 | for (i = 0; i < 4; i++) |
1257 | if (wwn->revision[i] >= 0x20) | |
e59a41b6 | 1258 | buf[i] = wwn->revision[i]; |
c66ac9db | 1259 | else |
e59a41b6 SAS |
1260 | buf[i] = ' '; |
1261 | buf[i] = '\0'; | |
1262 | pr_debug(" Revision: %s\n", buf); | |
c66ac9db | 1263 | |
e3d6f909 | 1264 | device_type = dev->transport->get_device_type(dev); |
6708bb27 AG |
1265 | pr_debug(" Type: %s ", scsi_device_type(device_type)); |
1266 | pr_debug(" ANSI SCSI revision: %02x\n", | |
e3d6f909 | 1267 | dev->transport->get_device_rev(dev)); |
c66ac9db NB |
1268 | } |
1269 | ||
1270 | struct se_device *transport_add_device_to_core_hba( | |
1271 | struct se_hba *hba, | |
1272 | struct se_subsystem_api *transport, | |
1273 | struct se_subsystem_dev *se_dev, | |
1274 | u32 device_flags, | |
1275 | void *transport_dev, | |
1276 | struct se_dev_limits *dev_limits, | |
1277 | const char *inquiry_prod, | |
1278 | const char *inquiry_rev) | |
1279 | { | |
12a18bdc | 1280 | int force_pt; |
c66ac9db NB |
1281 | struct se_device *dev; |
1282 | ||
1283 | dev = kzalloc(sizeof(struct se_device), GFP_KERNEL); | |
6708bb27 AG |
1284 | if (!dev) { |
1285 | pr_err("Unable to allocate memory for se_dev_t\n"); | |
c66ac9db NB |
1286 | return NULL; |
1287 | } | |
c66ac9db | 1288 | |
e3d6f909 | 1289 | transport_init_queue_obj(&dev->dev_queue_obj); |
c66ac9db NB |
1290 | dev->dev_flags = device_flags; |
1291 | dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED; | |
5951146d | 1292 | dev->dev_ptr = transport_dev; |
c66ac9db NB |
1293 | dev->se_hba = hba; |
1294 | dev->se_sub_dev = se_dev; | |
1295 | dev->transport = transport; | |
c66ac9db NB |
1296 | INIT_LIST_HEAD(&dev->dev_list); |
1297 | INIT_LIST_HEAD(&dev->dev_sep_list); | |
1298 | INIT_LIST_HEAD(&dev->dev_tmr_list); | |
1299 | INIT_LIST_HEAD(&dev->execute_task_list); | |
1300 | INIT_LIST_HEAD(&dev->delayed_cmd_list); | |
c66ac9db | 1301 | INIT_LIST_HEAD(&dev->state_task_list); |
07bde79a | 1302 | INIT_LIST_HEAD(&dev->qf_cmd_list); |
c66ac9db NB |
1303 | spin_lock_init(&dev->execute_task_lock); |
1304 | spin_lock_init(&dev->delayed_cmd_lock); | |
c66ac9db NB |
1305 | spin_lock_init(&dev->dev_reservation_lock); |
1306 | spin_lock_init(&dev->dev_status_lock); | |
c66ac9db NB |
1307 | spin_lock_init(&dev->se_port_lock); |
1308 | spin_lock_init(&dev->se_tmr_lock); | |
07bde79a | 1309 | spin_lock_init(&dev->qf_cmd_lock); |
c66ac9db NB |
1310 | atomic_set(&dev->dev_ordered_id, 0); |
1311 | ||
1312 | se_dev_set_default_attribs(dev, dev_limits); | |
1313 | ||
1314 | dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX); | |
1315 | dev->creation_time = get_jiffies_64(); | |
1316 | spin_lock_init(&dev->stats_lock); | |
1317 | ||
1318 | spin_lock(&hba->device_lock); | |
1319 | list_add_tail(&dev->dev_list, &hba->hba_dev_list); | |
1320 | hba->dev_count++; | |
1321 | spin_unlock(&hba->device_lock); | |
1322 | /* | |
1323 | * Setup the SAM Task Attribute emulation for struct se_device | |
1324 | */ | |
1325 | core_setup_task_attr_emulation(dev); | |
1326 | /* | |
1327 | * Force PR and ALUA passthrough emulation with internal object use. | |
1328 | */ | |
1329 | force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE); | |
1330 | /* | |
1331 | * Setup the Reservations infrastructure for struct se_device | |
1332 | */ | |
1333 | core_setup_reservations(dev, force_pt); | |
1334 | /* | |
1335 | * Setup the Asymmetric Logical Unit Assignment for struct se_device | |
1336 | */ | |
1337 | if (core_setup_alua(dev, force_pt) < 0) | |
1338 | goto out; | |
1339 | ||
1340 | /* | |
1341 | * Startup the struct se_device processing thread | |
1342 | */ | |
1343 | dev->process_thread = kthread_run(transport_processing_thread, dev, | |
e3d6f909 | 1344 | "LIO_%s", dev->transport->name); |
c66ac9db | 1345 | if (IS_ERR(dev->process_thread)) { |
6708bb27 | 1346 | pr_err("Unable to create kthread: LIO_%s\n", |
e3d6f909 | 1347 | dev->transport->name); |
c66ac9db NB |
1348 | goto out; |
1349 | } | |
07bde79a NB |
1350 | /* |
1351 | * Setup work_queue for QUEUE_FULL | |
1352 | */ | |
1353 | INIT_WORK(&dev->qf_work_queue, target_qf_do_work); | |
c66ac9db NB |
1354 | /* |
1355 | * Preload the initial INQUIRY const values if we are doing | |
1356 | * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI | |
1357 | * passthrough because this is being provided by the backend LLD. | |
1358 | * This is required so that transport_get_inquiry() copies these | |
1359 | * originals once back into DEV_T10_WWN(dev) for the virtual device | |
1360 | * setup. | |
1361 | */ | |
e3d6f909 | 1362 | if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) { |
f22c1196 | 1363 | if (!inquiry_prod || !inquiry_rev) { |
6708bb27 | 1364 | pr_err("All non TCM/pSCSI plugins require" |
c66ac9db NB |
1365 | " INQUIRY consts\n"); |
1366 | goto out; | |
1367 | } | |
1368 | ||
e3d6f909 AG |
1369 | strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8); |
1370 | strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16); | |
1371 | strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4); | |
c66ac9db NB |
1372 | } |
1373 | scsi_dump_inquiry(dev); | |
1374 | ||
12a18bdc | 1375 | return dev; |
c66ac9db | 1376 | out: |
c66ac9db NB |
1377 | kthread_stop(dev->process_thread); |
1378 | ||
1379 | spin_lock(&hba->device_lock); | |
1380 | list_del(&dev->dev_list); | |
1381 | hba->dev_count--; | |
1382 | spin_unlock(&hba->device_lock); | |
1383 | ||
1384 | se_release_vpd_for_dev(dev); | |
1385 | ||
c66ac9db NB |
1386 | kfree(dev); |
1387 | ||
1388 | return NULL; | |
1389 | } | |
1390 | EXPORT_SYMBOL(transport_add_device_to_core_hba); | |
1391 | ||
1392 | /* transport_generic_prepare_cdb(): | |
1393 | * | |
1394 | * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will | |
1395 | * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2. | |
1396 | * The point of this is since we are mapping iSCSI LUNs to | |
1397 | * SCSI Target IDs having a non-zero LUN in the CDB will throw the | |
1398 | * devices and HBAs for a loop. | |
1399 | */ | |
1400 | static inline void transport_generic_prepare_cdb( | |
1401 | unsigned char *cdb) | |
1402 | { | |
1403 | switch (cdb[0]) { | |
1404 | case READ_10: /* SBC - RDProtect */ | |
1405 | case READ_12: /* SBC - RDProtect */ | |
1406 | case READ_16: /* SBC - RDProtect */ | |
1407 | case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */ | |
1408 | case VERIFY: /* SBC - VRProtect */ | |
1409 | case VERIFY_16: /* SBC - VRProtect */ | |
1410 | case WRITE_VERIFY: /* SBC - VRProtect */ | |
1411 | case WRITE_VERIFY_12: /* SBC - VRProtect */ | |
1412 | break; | |
1413 | default: | |
1414 | cdb[1] &= 0x1f; /* clear logical unit number */ | |
1415 | break; | |
1416 | } | |
1417 | } | |
1418 | ||
1419 | static struct se_task * | |
1420 | transport_generic_get_task(struct se_cmd *cmd, | |
1421 | enum dma_data_direction data_direction) | |
1422 | { | |
1423 | struct se_task *task; | |
5951146d | 1424 | struct se_device *dev = cmd->se_dev; |
c66ac9db | 1425 | |
6708bb27 | 1426 | task = dev->transport->alloc_task(cmd->t_task_cdb); |
c66ac9db | 1427 | if (!task) { |
6708bb27 | 1428 | pr_err("Unable to allocate struct se_task\n"); |
c66ac9db NB |
1429 | return NULL; |
1430 | } | |
1431 | ||
1432 | INIT_LIST_HEAD(&task->t_list); | |
1433 | INIT_LIST_HEAD(&task->t_execute_list); | |
1434 | INIT_LIST_HEAD(&task->t_state_list); | |
1435 | init_completion(&task->task_stop_comp); | |
c66ac9db | 1436 | task->task_se_cmd = cmd; |
c66ac9db NB |
1437 | task->task_data_direction = data_direction; |
1438 | ||
c66ac9db NB |
1439 | return task; |
1440 | } | |
1441 | ||
1442 | static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *); | |
1443 | ||
c66ac9db NB |
1444 | /* |
1445 | * Used by fabric modules containing a local struct se_cmd within their | |
1446 | * fabric dependent per I/O descriptor. | |
1447 | */ | |
1448 | void transport_init_se_cmd( | |
1449 | struct se_cmd *cmd, | |
1450 | struct target_core_fabric_ops *tfo, | |
1451 | struct se_session *se_sess, | |
1452 | u32 data_length, | |
1453 | int data_direction, | |
1454 | int task_attr, | |
1455 | unsigned char *sense_buffer) | |
1456 | { | |
5951146d AG |
1457 | INIT_LIST_HEAD(&cmd->se_lun_node); |
1458 | INIT_LIST_HEAD(&cmd->se_delayed_node); | |
07bde79a | 1459 | INIT_LIST_HEAD(&cmd->se_qf_node); |
79a7fef2 | 1460 | INIT_LIST_HEAD(&cmd->se_queue_node); |
a17f091d | 1461 | INIT_LIST_HEAD(&cmd->se_cmd_list); |
a1d8b49a AG |
1462 | INIT_LIST_HEAD(&cmd->t_task_list); |
1463 | init_completion(&cmd->transport_lun_fe_stop_comp); | |
1464 | init_completion(&cmd->transport_lun_stop_comp); | |
1465 | init_completion(&cmd->t_transport_stop_comp); | |
a17f091d | 1466 | init_completion(&cmd->cmd_wait_comp); |
a1d8b49a | 1467 | spin_lock_init(&cmd->t_state_lock); |
7d680f3b | 1468 | cmd->transport_state = CMD_T_DEV_ACTIVE; |
c66ac9db NB |
1469 | |
1470 | cmd->se_tfo = tfo; | |
1471 | cmd->se_sess = se_sess; | |
1472 | cmd->data_length = data_length; | |
1473 | cmd->data_direction = data_direction; | |
1474 | cmd->sam_task_attr = task_attr; | |
1475 | cmd->sense_buffer = sense_buffer; | |
1476 | } | |
1477 | EXPORT_SYMBOL(transport_init_se_cmd); | |
1478 | ||
1479 | static int transport_check_alloc_task_attr(struct se_cmd *cmd) | |
1480 | { | |
1481 | /* | |
1482 | * Check if SAM Task Attribute emulation is enabled for this | |
1483 | * struct se_device storage object | |
1484 | */ | |
5951146d | 1485 | if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) |
c66ac9db NB |
1486 | return 0; |
1487 | ||
e66ecd50 | 1488 | if (cmd->sam_task_attr == MSG_ACA_TAG) { |
6708bb27 | 1489 | pr_debug("SAM Task Attribute ACA" |
c66ac9db | 1490 | " emulation is not supported\n"); |
e3d6f909 | 1491 | return -EINVAL; |
c66ac9db NB |
1492 | } |
1493 | /* | |
1494 | * Used to determine when ORDERED commands should go from | |
1495 | * Dormant to Active status. | |
1496 | */ | |
5951146d | 1497 | cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id); |
c66ac9db | 1498 | smp_mb__after_atomic_inc(); |
6708bb27 | 1499 | pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n", |
c66ac9db | 1500 | cmd->se_ordered_id, cmd->sam_task_attr, |
6708bb27 | 1501 | cmd->se_dev->transport->name); |
c66ac9db NB |
1502 | return 0; |
1503 | } | |
1504 | ||
c66ac9db NB |
1505 | /* transport_generic_allocate_tasks(): |
1506 | * | |
1507 | * Called from fabric RX Thread. | |
1508 | */ | |
1509 | int transport_generic_allocate_tasks( | |
1510 | struct se_cmd *cmd, | |
1511 | unsigned char *cdb) | |
1512 | { | |
1513 | int ret; | |
1514 | ||
1515 | transport_generic_prepare_cdb(cdb); | |
c66ac9db NB |
1516 | /* |
1517 | * Ensure that the received CDB is less than the max (252 + 8) bytes | |
1518 | * for VARIABLE_LENGTH_CMD | |
1519 | */ | |
1520 | if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) { | |
6708bb27 | 1521 | pr_err("Received SCSI CDB with command_size: %d that" |
c66ac9db NB |
1522 | " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n", |
1523 | scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE); | |
03e98c9e NB |
1524 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; |
1525 | cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; | |
e3d6f909 | 1526 | return -EINVAL; |
c66ac9db NB |
1527 | } |
1528 | /* | |
1529 | * If the received CDB is larger than TCM_MAX_COMMAND_SIZE, | |
1530 | * allocate the additional extended CDB buffer now.. Otherwise | |
1531 | * setup the pointer from __t_task_cdb to t_task_cdb. | |
1532 | */ | |
a1d8b49a AG |
1533 | if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) { |
1534 | cmd->t_task_cdb = kzalloc(scsi_command_size(cdb), | |
c66ac9db | 1535 | GFP_KERNEL); |
6708bb27 AG |
1536 | if (!cmd->t_task_cdb) { |
1537 | pr_err("Unable to allocate cmd->t_task_cdb" | |
a1d8b49a | 1538 | " %u > sizeof(cmd->__t_task_cdb): %lu ops\n", |
c66ac9db | 1539 | scsi_command_size(cdb), |
a1d8b49a | 1540 | (unsigned long)sizeof(cmd->__t_task_cdb)); |
03e98c9e NB |
1541 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; |
1542 | cmd->scsi_sense_reason = | |
1543 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
e3d6f909 | 1544 | return -ENOMEM; |
c66ac9db NB |
1545 | } |
1546 | } else | |
a1d8b49a | 1547 | cmd->t_task_cdb = &cmd->__t_task_cdb[0]; |
c66ac9db | 1548 | /* |
a1d8b49a | 1549 | * Copy the original CDB into cmd-> |
c66ac9db | 1550 | */ |
a1d8b49a | 1551 | memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb)); |
c66ac9db NB |
1552 | /* |
1553 | * Setup the received CDB based on SCSI defined opcodes and | |
1554 | * perform unit attention, persistent reservations and ALUA | |
a1d8b49a | 1555 | * checks for virtual device backends. The cmd->t_task_cdb |
c66ac9db NB |
1556 | * pointer is expected to be setup before we reach this point. |
1557 | */ | |
1558 | ret = transport_generic_cmd_sequencer(cmd, cdb); | |
1559 | if (ret < 0) | |
1560 | return ret; | |
1561 | /* | |
1562 | * Check for SAM Task Attribute Emulation | |
1563 | */ | |
1564 | if (transport_check_alloc_task_attr(cmd) < 0) { | |
1565 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
1566 | cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; | |
5951146d | 1567 | return -EINVAL; |
c66ac9db NB |
1568 | } |
1569 | spin_lock(&cmd->se_lun->lun_sep_lock); | |
1570 | if (cmd->se_lun->lun_sep) | |
1571 | cmd->se_lun->lun_sep->sep_stats.cmd_pdus++; | |
1572 | spin_unlock(&cmd->se_lun->lun_sep_lock); | |
1573 | return 0; | |
1574 | } | |
1575 | EXPORT_SYMBOL(transport_generic_allocate_tasks); | |
1576 | ||
695434e1 NB |
1577 | /* |
1578 | * Used by fabric module frontends to queue tasks directly. | |
1579 | * Many only be used from process context only | |
1580 | */ | |
1581 | int transport_handle_cdb_direct( | |
1582 | struct se_cmd *cmd) | |
1583 | { | |
dd8ae59d NB |
1584 | int ret; |
1585 | ||
695434e1 NB |
1586 | if (!cmd->se_lun) { |
1587 | dump_stack(); | |
6708bb27 | 1588 | pr_err("cmd->se_lun is NULL\n"); |
695434e1 NB |
1589 | return -EINVAL; |
1590 | } | |
1591 | if (in_interrupt()) { | |
1592 | dump_stack(); | |
6708bb27 | 1593 | pr_err("transport_generic_handle_cdb cannot be called" |
695434e1 NB |
1594 | " from interrupt context\n"); |
1595 | return -EINVAL; | |
1596 | } | |
dd8ae59d | 1597 | /* |
7d680f3b | 1598 | * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE following |
dd8ae59d NB |
1599 | * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue() |
1600 | * in existing usage to ensure that outstanding descriptors are handled | |
d14921d6 | 1601 | * correctly during shutdown via transport_wait_for_tasks() |
dd8ae59d NB |
1602 | * |
1603 | * Also, we don't take cmd->t_state_lock here as we only expect | |
1604 | * this to be called for initial descriptor submission. | |
1605 | */ | |
1606 | cmd->t_state = TRANSPORT_NEW_CMD; | |
7d680f3b CH |
1607 | cmd->transport_state |= CMD_T_ACTIVE; |
1608 | ||
dd8ae59d NB |
1609 | /* |
1610 | * transport_generic_new_cmd() is already handling QUEUE_FULL, | |
1611 | * so follow TRANSPORT_NEW_CMD processing thread context usage | |
1612 | * and call transport_generic_request_failure() if necessary.. | |
1613 | */ | |
1614 | ret = transport_generic_new_cmd(cmd); | |
03e98c9e NB |
1615 | if (ret < 0) |
1616 | transport_generic_request_failure(cmd); | |
1617 | ||
dd8ae59d | 1618 | return 0; |
695434e1 NB |
1619 | } |
1620 | EXPORT_SYMBOL(transport_handle_cdb_direct); | |
1621 | ||
a6360785 NB |
1622 | /** |
1623 | * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd | |
1624 | * | |
1625 | * @se_cmd: command descriptor to submit | |
1626 | * @se_sess: associated se_sess for endpoint | |
1627 | * @cdb: pointer to SCSI CDB | |
1628 | * @sense: pointer to SCSI sense buffer | |
1629 | * @unpacked_lun: unpacked LUN to reference for struct se_lun | |
1630 | * @data_length: fabric expected data transfer length | |
1631 | * @task_addr: SAM task attribute | |
1632 | * @data_dir: DMA data direction | |
1633 | * @flags: flags for command submission from target_sc_flags_tables | |
1634 | * | |
1635 | * This may only be called from process context, and also currently | |
1636 | * assumes internal allocation of fabric payload buffer by target-core. | |
1637 | **/ | |
1edcdb49 | 1638 | void target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess, |
a6360785 NB |
1639 | unsigned char *cdb, unsigned char *sense, u32 unpacked_lun, |
1640 | u32 data_length, int task_attr, int data_dir, int flags) | |
1641 | { | |
1642 | struct se_portal_group *se_tpg; | |
1643 | int rc; | |
1644 | ||
1645 | se_tpg = se_sess->se_tpg; | |
1646 | BUG_ON(!se_tpg); | |
1647 | BUG_ON(se_cmd->se_tfo || se_cmd->se_sess); | |
1648 | BUG_ON(in_interrupt()); | |
1649 | /* | |
1650 | * Initialize se_cmd for target operation. From this point | |
1651 | * exceptions are handled by sending exception status via | |
1652 | * target_core_fabric_ops->queue_status() callback | |
1653 | */ | |
1654 | transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, | |
1655 | data_length, data_dir, task_attr, sense); | |
1656 | /* | |
1657 | * Obtain struct se_cmd->cmd_kref reference and add new cmd to | |
1658 | * se_sess->sess_cmd_list. A second kref_get here is necessary | |
1659 | * for fabrics using TARGET_SCF_ACK_KREF that expect a second | |
1660 | * kref_put() to happen during fabric packet acknowledgement. | |
1661 | */ | |
1662 | target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF)); | |
1663 | /* | |
1664 | * Signal bidirectional data payloads to target-core | |
1665 | */ | |
1666 | if (flags & TARGET_SCF_BIDI_OP) | |
1667 | se_cmd->se_cmd_flags |= SCF_BIDI; | |
1668 | /* | |
1669 | * Locate se_lun pointer and attach it to struct se_cmd | |
1670 | */ | |
735703ca NB |
1671 | if (transport_lookup_cmd_lun(se_cmd, unpacked_lun) < 0) { |
1672 | transport_send_check_condition_and_sense(se_cmd, | |
1673 | se_cmd->scsi_sense_reason, 0); | |
1674 | target_put_sess_cmd(se_sess, se_cmd); | |
1675 | return; | |
1676 | } | |
a6360785 NB |
1677 | /* |
1678 | * Sanitize CDBs via transport_generic_cmd_sequencer() and | |
1679 | * allocate the necessary tasks to complete the received CDB+data | |
1680 | */ | |
1681 | rc = transport_generic_allocate_tasks(se_cmd, cdb); | |
735703ca NB |
1682 | if (rc != 0) { |
1683 | transport_generic_request_failure(se_cmd); | |
1684 | return; | |
1685 | } | |
a6360785 NB |
1686 | /* |
1687 | * Dispatch se_cmd descriptor to se_lun->lun_se_dev backend | |
1688 | * for immediate execution of READs, otherwise wait for | |
1689 | * transport_generic_handle_data() to be called for WRITEs | |
1690 | * when fabric has filled the incoming buffer. | |
1691 | */ | |
1692 | transport_handle_cdb_direct(se_cmd); | |
1edcdb49 | 1693 | return; |
a6360785 NB |
1694 | } |
1695 | EXPORT_SYMBOL(target_submit_cmd); | |
1696 | ||
9f0d05c2 NB |
1697 | static void target_complete_tmr_failure(struct work_struct *work) |
1698 | { | |
1699 | struct se_cmd *se_cmd = container_of(work, struct se_cmd, work); | |
1700 | ||
1701 | se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST; | |
1702 | se_cmd->se_tfo->queue_tm_rsp(se_cmd); | |
1703 | transport_generic_free_cmd(se_cmd, 0); | |
1704 | } | |
1705 | ||
ea98d7f9 AG |
1706 | /** |
1707 | * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd | |
1708 | * for TMR CDBs | |
1709 | * | |
1710 | * @se_cmd: command descriptor to submit | |
1711 | * @se_sess: associated se_sess for endpoint | |
1712 | * @sense: pointer to SCSI sense buffer | |
1713 | * @unpacked_lun: unpacked LUN to reference for struct se_lun | |
1714 | * @fabric_context: fabric context for TMR req | |
1715 | * @tm_type: Type of TM request | |
c0974f89 NB |
1716 | * @gfp: gfp type for caller |
1717 | * @tag: referenced task tag for TMR_ABORT_TASK | |
c7042cae | 1718 | * @flags: submit cmd flags |
ea98d7f9 AG |
1719 | * |
1720 | * Callable from all contexts. | |
1721 | **/ | |
1722 | ||
c7042cae | 1723 | int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess, |
ea98d7f9 | 1724 | unsigned char *sense, u32 unpacked_lun, |
c0974f89 NB |
1725 | void *fabric_tmr_ptr, unsigned char tm_type, |
1726 | gfp_t gfp, unsigned int tag, int flags) | |
ea98d7f9 AG |
1727 | { |
1728 | struct se_portal_group *se_tpg; | |
1729 | int ret; | |
1730 | ||
1731 | se_tpg = se_sess->se_tpg; | |
1732 | BUG_ON(!se_tpg); | |
1733 | ||
1734 | transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, | |
1735 | 0, DMA_NONE, MSG_SIMPLE_TAG, sense); | |
c7042cae NB |
1736 | /* |
1737 | * FIXME: Currently expect caller to handle se_cmd->se_tmr_req | |
1738 | * allocation failure. | |
1739 | */ | |
c0974f89 | 1740 | ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp); |
c7042cae NB |
1741 | if (ret < 0) |
1742 | return -ENOMEM; | |
ea98d7f9 | 1743 | |
c0974f89 NB |
1744 | if (tm_type == TMR_ABORT_TASK) |
1745 | se_cmd->se_tmr_req->ref_task_tag = tag; | |
1746 | ||
ea98d7f9 AG |
1747 | /* See target_submit_cmd for commentary */ |
1748 | target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF)); | |
1749 | ||
ea98d7f9 AG |
1750 | ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun); |
1751 | if (ret) { | |
9f0d05c2 NB |
1752 | /* |
1753 | * For callback during failure handling, push this work off | |
1754 | * to process context with TMR_LUN_DOES_NOT_EXIST status. | |
1755 | */ | |
1756 | INIT_WORK(&se_cmd->work, target_complete_tmr_failure); | |
1757 | schedule_work(&se_cmd->work); | |
c7042cae | 1758 | return 0; |
ea98d7f9 AG |
1759 | } |
1760 | transport_generic_handle_tmr(se_cmd); | |
c7042cae | 1761 | return 0; |
ea98d7f9 AG |
1762 | } |
1763 | EXPORT_SYMBOL(target_submit_tmr); | |
1764 | ||
c66ac9db NB |
1765 | /* |
1766 | * Used by fabric module frontends defining a TFO->new_cmd_map() caller | |
1767 | * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to | |
1768 | * complete setup in TCM process context w/ TFO->new_cmd_map(). | |
1769 | */ | |
1770 | int transport_generic_handle_cdb_map( | |
1771 | struct se_cmd *cmd) | |
1772 | { | |
e3d6f909 | 1773 | if (!cmd->se_lun) { |
c66ac9db | 1774 | dump_stack(); |
6708bb27 | 1775 | pr_err("cmd->se_lun is NULL\n"); |
e3d6f909 | 1776 | return -EINVAL; |
c66ac9db NB |
1777 | } |
1778 | ||
f7a5cc0b | 1779 | transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP, false); |
c66ac9db NB |
1780 | return 0; |
1781 | } | |
1782 | EXPORT_SYMBOL(transport_generic_handle_cdb_map); | |
1783 | ||
1784 | /* transport_generic_handle_data(): | |
1785 | * | |
1786 | * | |
1787 | */ | |
1788 | int transport_generic_handle_data( | |
1789 | struct se_cmd *cmd) | |
1790 | { | |
1791 | /* | |
1792 | * For the software fabric case, then we assume the nexus is being | |
1793 | * failed/shutdown when signals are pending from the kthread context | |
1794 | * caller, so we return a failure. For the HW target mode case running | |
1795 | * in interrupt code, the signal_pending() check is skipped. | |
1796 | */ | |
1797 | if (!in_interrupt() && signal_pending(current)) | |
e3d6f909 | 1798 | return -EPERM; |
c66ac9db NB |
1799 | /* |
1800 | * If the received CDB has aleady been ABORTED by the generic | |
1801 | * target engine, we now call transport_check_aborted_status() | |
1802 | * to queue any delated TASK_ABORTED status for the received CDB to the | |
25985edc | 1803 | * fabric module as we are expecting no further incoming DATA OUT |
c66ac9db NB |
1804 | * sequences at this point. |
1805 | */ | |
1806 | if (transport_check_aborted_status(cmd, 1) != 0) | |
1807 | return 0; | |
1808 | ||
f7a5cc0b | 1809 | transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE, false); |
c66ac9db NB |
1810 | return 0; |
1811 | } | |
1812 | EXPORT_SYMBOL(transport_generic_handle_data); | |
1813 | ||
1814 | /* transport_generic_handle_tmr(): | |
1815 | * | |
1816 | * | |
1817 | */ | |
1818 | int transport_generic_handle_tmr( | |
1819 | struct se_cmd *cmd) | |
1820 | { | |
f7a5cc0b | 1821 | transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR, false); |
c66ac9db NB |
1822 | return 0; |
1823 | } | |
1824 | EXPORT_SYMBOL(transport_generic_handle_tmr); | |
1825 | ||
cdbb70bb CH |
1826 | /* |
1827 | * If the task is active, request it to be stopped and sleep until it | |
1828 | * has completed. | |
1829 | */ | |
1830 | bool target_stop_task(struct se_task *task, unsigned long *flags) | |
1831 | { | |
1832 | struct se_cmd *cmd = task->task_se_cmd; | |
1833 | bool was_active = false; | |
1834 | ||
1835 | if (task->task_flags & TF_ACTIVE) { | |
1836 | task->task_flags |= TF_REQUEST_STOP; | |
1837 | spin_unlock_irqrestore(&cmd->t_state_lock, *flags); | |
1838 | ||
1839 | pr_debug("Task %p waiting to complete\n", task); | |
1840 | wait_for_completion(&task->task_stop_comp); | |
1841 | pr_debug("Task %p stopped successfully\n", task); | |
1842 | ||
1843 | spin_lock_irqsave(&cmd->t_state_lock, *flags); | |
1844 | atomic_dec(&cmd->t_task_cdbs_left); | |
1845 | task->task_flags &= ~(TF_ACTIVE | TF_REQUEST_STOP); | |
1846 | was_active = true; | |
1847 | } | |
1848 | ||
cdbb70bb CH |
1849 | return was_active; |
1850 | } | |
1851 | ||
c66ac9db NB |
1852 | static int transport_stop_tasks_for_cmd(struct se_cmd *cmd) |
1853 | { | |
1854 | struct se_task *task, *task_tmp; | |
1855 | unsigned long flags; | |
1856 | int ret = 0; | |
1857 | ||
6708bb27 | 1858 | pr_debug("ITT[0x%08x] - Stopping tasks\n", |
e3d6f909 | 1859 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db NB |
1860 | |
1861 | /* | |
1862 | * No tasks remain in the execution queue | |
1863 | */ | |
a1d8b49a | 1864 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 1865 | list_for_each_entry_safe(task, task_tmp, |
a1d8b49a | 1866 | &cmd->t_task_list, t_list) { |
04629b7b | 1867 | pr_debug("Processing task %p\n", task); |
c66ac9db NB |
1868 | /* |
1869 | * If the struct se_task has not been sent and is not active, | |
1870 | * remove the struct se_task from the execution queue. | |
1871 | */ | |
6c76bf95 | 1872 | if (!(task->task_flags & (TF_ACTIVE | TF_SENT))) { |
a1d8b49a | 1873 | spin_unlock_irqrestore(&cmd->t_state_lock, |
c66ac9db NB |
1874 | flags); |
1875 | transport_remove_task_from_execute_queue(task, | |
42bf829e | 1876 | cmd->se_dev); |
c66ac9db | 1877 | |
04629b7b | 1878 | pr_debug("Task %p removed from execute queue\n", task); |
a1d8b49a | 1879 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db NB |
1880 | continue; |
1881 | } | |
1882 | ||
cdbb70bb | 1883 | if (!target_stop_task(task, &flags)) { |
04629b7b | 1884 | pr_debug("Task %p - did nothing\n", task); |
c66ac9db NB |
1885 | ret++; |
1886 | } | |
c66ac9db | 1887 | } |
a1d8b49a | 1888 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
1889 | |
1890 | return ret; | |
1891 | } | |
1892 | ||
c66ac9db NB |
1893 | /* |
1894 | * Handle SAM-esque emulation for generic transport request failures. | |
1895 | */ | |
2fbff127 | 1896 | void transport_generic_request_failure(struct se_cmd *cmd) |
c66ac9db | 1897 | { |
07bde79a NB |
1898 | int ret = 0; |
1899 | ||
6708bb27 | 1900 | pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x" |
e3d6f909 | 1901 | " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd), |
a1d8b49a | 1902 | cmd->t_task_cdb[0]); |
03e98c9e | 1903 | pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n", |
e3d6f909 | 1904 | cmd->se_tfo->get_cmd_state(cmd), |
03e98c9e | 1905 | cmd->t_state, cmd->scsi_sense_reason); |
6708bb27 | 1906 | pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d" |
c66ac9db | 1907 | " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --" |
7d680f3b CH |
1908 | " CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n", |
1909 | cmd->t_task_list_num, | |
a1d8b49a AG |
1910 | atomic_read(&cmd->t_task_cdbs_left), |
1911 | atomic_read(&cmd->t_task_cdbs_sent), | |
1912 | atomic_read(&cmd->t_task_cdbs_ex_left), | |
7d680f3b CH |
1913 | (cmd->transport_state & CMD_T_ACTIVE) != 0, |
1914 | (cmd->transport_state & CMD_T_STOP) != 0, | |
1915 | (cmd->transport_state & CMD_T_SENT) != 0); | |
c66ac9db | 1916 | |
c66ac9db NB |
1917 | /* |
1918 | * For SAM Task Attribute emulation for failed struct se_cmd | |
1919 | */ | |
1920 | if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) | |
1921 | transport_complete_task_attr(cmd); | |
1922 | ||
03e98c9e NB |
1923 | switch (cmd->scsi_sense_reason) { |
1924 | case TCM_NON_EXISTENT_LUN: | |
1925 | case TCM_UNSUPPORTED_SCSI_OPCODE: | |
1926 | case TCM_INVALID_CDB_FIELD: | |
1927 | case TCM_INVALID_PARAMETER_LIST: | |
1928 | case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE: | |
1929 | case TCM_UNKNOWN_MODE_PAGE: | |
1930 | case TCM_WRITE_PROTECTED: | |
1931 | case TCM_CHECK_CONDITION_ABORT_CMD: | |
1932 | case TCM_CHECK_CONDITION_UNIT_ATTENTION: | |
1933 | case TCM_CHECK_CONDITION_NOT_READY: | |
c66ac9db | 1934 | break; |
03e98c9e | 1935 | case TCM_RESERVATION_CONFLICT: |
c66ac9db NB |
1936 | /* |
1937 | * No SENSE Data payload for this case, set SCSI Status | |
1938 | * and queue the response to $FABRIC_MOD. | |
1939 | * | |
1940 | * Uses linux/include/scsi/scsi.h SAM status codes defs | |
1941 | */ | |
1942 | cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT; | |
1943 | /* | |
1944 | * For UA Interlock Code 11b, a RESERVATION CONFLICT will | |
1945 | * establish a UNIT ATTENTION with PREVIOUS RESERVATION | |
1946 | * CONFLICT STATUS. | |
1947 | * | |
1948 | * See spc4r17, section 7.4.6 Control Mode Page, Table 349 | |
1949 | */ | |
e3d6f909 AG |
1950 | if (cmd->se_sess && |
1951 | cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2) | |
1952 | core_scsi3_ua_allocate(cmd->se_sess->se_node_acl, | |
c66ac9db NB |
1953 | cmd->orig_fe_lun, 0x2C, |
1954 | ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS); | |
1955 | ||
07bde79a | 1956 | ret = cmd->se_tfo->queue_status(cmd); |
f147abb4 | 1957 | if (ret == -EAGAIN || ret == -ENOMEM) |
07bde79a | 1958 | goto queue_full; |
c66ac9db | 1959 | goto check_stop; |
c66ac9db | 1960 | default: |
6708bb27 | 1961 | pr_err("Unknown transport error for CDB 0x%02x: %d\n", |
03e98c9e | 1962 | cmd->t_task_cdb[0], cmd->scsi_sense_reason); |
c66ac9db NB |
1963 | cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; |
1964 | break; | |
1965 | } | |
16ab8e60 NB |
1966 | /* |
1967 | * If a fabric does not define a cmd->se_tfo->new_cmd_map caller, | |
1968 | * make the call to transport_send_check_condition_and_sense() | |
1969 | * directly. Otherwise expect the fabric to make the call to | |
1970 | * transport_send_check_condition_and_sense() after handling | |
1971 | * possible unsoliticied write data payloads. | |
1972 | */ | |
03e98c9e NB |
1973 | ret = transport_send_check_condition_and_sense(cmd, |
1974 | cmd->scsi_sense_reason, 0); | |
1975 | if (ret == -EAGAIN || ret == -ENOMEM) | |
1976 | goto queue_full; | |
07bde79a | 1977 | |
c66ac9db NB |
1978 | check_stop: |
1979 | transport_lun_remove_cmd(cmd); | |
6708bb27 | 1980 | if (!transport_cmd_check_stop_to_fabric(cmd)) |
c66ac9db | 1981 | ; |
07bde79a NB |
1982 | return; |
1983 | ||
1984 | queue_full: | |
e057f533 CH |
1985 | cmd->t_state = TRANSPORT_COMPLETE_QF_OK; |
1986 | transport_handle_queue_full(cmd, cmd->se_dev); | |
c66ac9db | 1987 | } |
2fbff127 | 1988 | EXPORT_SYMBOL(transport_generic_request_failure); |
c66ac9db | 1989 | |
c66ac9db NB |
1990 | static inline u32 transport_lba_21(unsigned char *cdb) |
1991 | { | |
1992 | return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3]; | |
1993 | } | |
1994 | ||
1995 | static inline u32 transport_lba_32(unsigned char *cdb) | |
1996 | { | |
1997 | return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; | |
1998 | } | |
1999 | ||
2000 | static inline unsigned long long transport_lba_64(unsigned char *cdb) | |
2001 | { | |
2002 | unsigned int __v1, __v2; | |
2003 | ||
2004 | __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; | |
2005 | __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; | |
2006 | ||
2007 | return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; | |
2008 | } | |
2009 | ||
2010 | /* | |
2011 | * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs | |
2012 | */ | |
2013 | static inline unsigned long long transport_lba_64_ext(unsigned char *cdb) | |
2014 | { | |
2015 | unsigned int __v1, __v2; | |
2016 | ||
2017 | __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15]; | |
2018 | __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19]; | |
2019 | ||
2020 | return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; | |
2021 | } | |
2022 | ||
2023 | static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd) | |
2024 | { | |
2025 | unsigned long flags; | |
2026 | ||
a1d8b49a | 2027 | spin_lock_irqsave(&se_cmd->t_state_lock, flags); |
c66ac9db | 2028 | se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE; |
a1d8b49a | 2029 | spin_unlock_irqrestore(&se_cmd->t_state_lock, flags); |
c66ac9db NB |
2030 | } |
2031 | ||
c66ac9db NB |
2032 | /* |
2033 | * Called from Fabric Module context from transport_execute_tasks() | |
2034 | * | |
2035 | * The return of this function determins if the tasks from struct se_cmd | |
2036 | * get added to the execution queue in transport_execute_tasks(), | |
2037 | * or are added to the delayed or ordered lists here. | |
2038 | */ | |
2039 | static inline int transport_execute_task_attr(struct se_cmd *cmd) | |
2040 | { | |
5951146d | 2041 | if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) |
c66ac9db NB |
2042 | return 1; |
2043 | /* | |
25985edc | 2044 | * Check for the existence of HEAD_OF_QUEUE, and if true return 1 |
c66ac9db NB |
2045 | * to allow the passed struct se_cmd list of tasks to the front of the list. |
2046 | */ | |
e66ecd50 | 2047 | if (cmd->sam_task_attr == MSG_HEAD_TAG) { |
6708bb27 | 2048 | pr_debug("Added HEAD_OF_QUEUE for CDB:" |
c66ac9db | 2049 | " 0x%02x, se_ordered_id: %u\n", |
6708bb27 | 2050 | cmd->t_task_cdb[0], |
c66ac9db NB |
2051 | cmd->se_ordered_id); |
2052 | return 1; | |
e66ecd50 | 2053 | } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) { |
5951146d | 2054 | atomic_inc(&cmd->se_dev->dev_ordered_sync); |
c66ac9db NB |
2055 | smp_mb__after_atomic_inc(); |
2056 | ||
6708bb27 | 2057 | pr_debug("Added ORDERED for CDB: 0x%02x to ordered" |
c66ac9db | 2058 | " list, se_ordered_id: %u\n", |
a1d8b49a | 2059 | cmd->t_task_cdb[0], |
c66ac9db NB |
2060 | cmd->se_ordered_id); |
2061 | /* | |
2062 | * Add ORDERED command to tail of execution queue if | |
2063 | * no other older commands exist that need to be | |
2064 | * completed first. | |
2065 | */ | |
6708bb27 | 2066 | if (!atomic_read(&cmd->se_dev->simple_cmds)) |
c66ac9db NB |
2067 | return 1; |
2068 | } else { | |
2069 | /* | |
2070 | * For SIMPLE and UNTAGGED Task Attribute commands | |
2071 | */ | |
5951146d | 2072 | atomic_inc(&cmd->se_dev->simple_cmds); |
c66ac9db NB |
2073 | smp_mb__after_atomic_inc(); |
2074 | } | |
2075 | /* | |
2076 | * Otherwise if one or more outstanding ORDERED task attribute exist, | |
2077 | * add the dormant task(s) built for the passed struct se_cmd to the | |
2078 | * execution queue and become in Active state for this struct se_device. | |
2079 | */ | |
5951146d | 2080 | if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) { |
c66ac9db NB |
2081 | /* |
2082 | * Otherwise, add cmd w/ tasks to delayed cmd queue that | |
25985edc | 2083 | * will be drained upon completion of HEAD_OF_QUEUE task. |
c66ac9db | 2084 | */ |
5951146d | 2085 | spin_lock(&cmd->se_dev->delayed_cmd_lock); |
c66ac9db | 2086 | cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR; |
5951146d AG |
2087 | list_add_tail(&cmd->se_delayed_node, |
2088 | &cmd->se_dev->delayed_cmd_list); | |
2089 | spin_unlock(&cmd->se_dev->delayed_cmd_lock); | |
c66ac9db | 2090 | |
6708bb27 | 2091 | pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to" |
c66ac9db | 2092 | " delayed CMD list, se_ordered_id: %u\n", |
a1d8b49a | 2093 | cmd->t_task_cdb[0], cmd->sam_task_attr, |
c66ac9db NB |
2094 | cmd->se_ordered_id); |
2095 | /* | |
2096 | * Return zero to let transport_execute_tasks() know | |
2097 | * not to add the delayed tasks to the execution list. | |
2098 | */ | |
2099 | return 0; | |
2100 | } | |
2101 | /* | |
2102 | * Otherwise, no ORDERED task attributes exist.. | |
2103 | */ | |
2104 | return 1; | |
2105 | } | |
2106 | ||
2107 | /* | |
2108 | * Called from fabric module context in transport_generic_new_cmd() and | |
2109 | * transport_generic_process_write() | |
2110 | */ | |
2111 | static int transport_execute_tasks(struct se_cmd *cmd) | |
2112 | { | |
2113 | int add_tasks; | |
40be67f4 | 2114 | struct se_device *se_dev = cmd->se_dev; |
c66ac9db NB |
2115 | /* |
2116 | * Call transport_cmd_check_stop() to see if a fabric exception | |
25985edc | 2117 | * has occurred that prevents execution. |
c66ac9db | 2118 | */ |
6708bb27 | 2119 | if (!transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING)) { |
c66ac9db NB |
2120 | /* |
2121 | * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE | |
2122 | * attribute for the tasks of the received struct se_cmd CDB | |
2123 | */ | |
2124 | add_tasks = transport_execute_task_attr(cmd); | |
e3d6f909 | 2125 | if (!add_tasks) |
c66ac9db NB |
2126 | goto execute_tasks; |
2127 | /* | |
4d2300cc NB |
2128 | * __transport_execute_tasks() -> __transport_add_tasks_from_cmd() |
2129 | * adds associated se_tasks while holding dev->execute_task_lock | |
2130 | * before I/O dispath to avoid a double spinlock access. | |
c66ac9db | 2131 | */ |
4d2300cc NB |
2132 | __transport_execute_tasks(se_dev, cmd); |
2133 | return 0; | |
c66ac9db | 2134 | } |
4d2300cc | 2135 | |
c66ac9db | 2136 | execute_tasks: |
4d2300cc | 2137 | __transport_execute_tasks(se_dev, NULL); |
c66ac9db NB |
2138 | return 0; |
2139 | } | |
2140 | ||
2141 | /* | |
2142 | * Called to check struct se_device tcq depth window, and once open pull struct se_task | |
2143 | * from struct se_device->execute_task_list and | |
2144 | * | |
2145 | * Called from transport_processing_thread() | |
2146 | */ | |
4d2300cc | 2147 | static int __transport_execute_tasks(struct se_device *dev, struct se_cmd *new_cmd) |
c66ac9db NB |
2148 | { |
2149 | int error; | |
2150 | struct se_cmd *cmd = NULL; | |
e3d6f909 | 2151 | struct se_task *task = NULL; |
c66ac9db NB |
2152 | unsigned long flags; |
2153 | ||
c66ac9db | 2154 | check_depth: |
e3d6f909 | 2155 | spin_lock_irq(&dev->execute_task_lock); |
4d2300cc NB |
2156 | if (new_cmd != NULL) |
2157 | __transport_add_tasks_from_cmd(new_cmd); | |
2158 | ||
e3d6f909 AG |
2159 | if (list_empty(&dev->execute_task_list)) { |
2160 | spin_unlock_irq(&dev->execute_task_lock); | |
c66ac9db NB |
2161 | return 0; |
2162 | } | |
e3d6f909 AG |
2163 | task = list_first_entry(&dev->execute_task_list, |
2164 | struct se_task, t_execute_list); | |
04629b7b | 2165 | __transport_remove_task_from_execute_queue(task, dev); |
e3d6f909 | 2166 | spin_unlock_irq(&dev->execute_task_lock); |
c66ac9db | 2167 | |
e3d6f909 | 2168 | cmd = task->task_se_cmd; |
a1d8b49a | 2169 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
6c76bf95 | 2170 | task->task_flags |= (TF_ACTIVE | TF_SENT); |
a1d8b49a | 2171 | atomic_inc(&cmd->t_task_cdbs_sent); |
c66ac9db | 2172 | |
a1d8b49a AG |
2173 | if (atomic_read(&cmd->t_task_cdbs_sent) == |
2174 | cmd->t_task_list_num) | |
7d680f3b | 2175 | cmd->transport_state |= CMD_T_SENT; |
c66ac9db | 2176 | |
a1d8b49a | 2177 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 2178 | |
5bda90c8 CH |
2179 | if (cmd->execute_task) |
2180 | error = cmd->execute_task(task); | |
2181 | else | |
2182 | error = dev->transport->do_task(task); | |
d29a5b6a | 2183 | if (error != 0) { |
d29a5b6a CH |
2184 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
2185 | task->task_flags &= ~TF_ACTIVE; | |
7d680f3b | 2186 | cmd->transport_state &= ~CMD_T_SENT; |
d29a5b6a | 2187 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
7d680f3b | 2188 | |
d29a5b6a | 2189 | transport_stop_tasks_for_cmd(cmd); |
03e98c9e | 2190 | transport_generic_request_failure(cmd); |
c66ac9db NB |
2191 | } |
2192 | ||
4d2300cc | 2193 | new_cmd = NULL; |
c66ac9db NB |
2194 | goto check_depth; |
2195 | ||
2196 | return 0; | |
2197 | } | |
2198 | ||
c66ac9db NB |
2199 | static inline u32 transport_get_sectors_6( |
2200 | unsigned char *cdb, | |
2201 | struct se_cmd *cmd, | |
2202 | int *ret) | |
2203 | { | |
5951146d | 2204 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
2205 | |
2206 | /* | |
2207 | * Assume TYPE_DISK for non struct se_device objects. | |
2208 | * Use 8-bit sector value. | |
2209 | */ | |
2210 | if (!dev) | |
2211 | goto type_disk; | |
2212 | ||
2213 | /* | |
2214 | * Use 24-bit allocation length for TYPE_TAPE. | |
2215 | */ | |
e3d6f909 | 2216 | if (dev->transport->get_device_type(dev) == TYPE_TAPE) |
c66ac9db NB |
2217 | return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4]; |
2218 | ||
2219 | /* | |
2220 | * Everything else assume TYPE_DISK Sector CDB location. | |
9b5cd7f3 RD |
2221 | * Use 8-bit sector value. SBC-3 says: |
2222 | * | |
2223 | * A TRANSFER LENGTH field set to zero specifies that 256 | |
2224 | * logical blocks shall be written. Any other value | |
2225 | * specifies the number of logical blocks that shall be | |
2226 | * written. | |
c66ac9db NB |
2227 | */ |
2228 | type_disk: | |
9b5cd7f3 | 2229 | return cdb[4] ? : 256; |
c66ac9db NB |
2230 | } |
2231 | ||
2232 | static inline u32 transport_get_sectors_10( | |
2233 | unsigned char *cdb, | |
2234 | struct se_cmd *cmd, | |
2235 | int *ret) | |
2236 | { | |
5951146d | 2237 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
2238 | |
2239 | /* | |
2240 | * Assume TYPE_DISK for non struct se_device objects. | |
2241 | * Use 16-bit sector value. | |
2242 | */ | |
2243 | if (!dev) | |
2244 | goto type_disk; | |
2245 | ||
2246 | /* | |
2247 | * XXX_10 is not defined in SSC, throw an exception | |
2248 | */ | |
e3d6f909 AG |
2249 | if (dev->transport->get_device_type(dev) == TYPE_TAPE) { |
2250 | *ret = -EINVAL; | |
c66ac9db NB |
2251 | return 0; |
2252 | } | |
2253 | ||
2254 | /* | |
2255 | * Everything else assume TYPE_DISK Sector CDB location. | |
2256 | * Use 16-bit sector value. | |
2257 | */ | |
2258 | type_disk: | |
2259 | return (u32)(cdb[7] << 8) + cdb[8]; | |
2260 | } | |
2261 | ||
2262 | static inline u32 transport_get_sectors_12( | |
2263 | unsigned char *cdb, | |
2264 | struct se_cmd *cmd, | |
2265 | int *ret) | |
2266 | { | |
5951146d | 2267 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
2268 | |
2269 | /* | |
2270 | * Assume TYPE_DISK for non struct se_device objects. | |
2271 | * Use 32-bit sector value. | |
2272 | */ | |
2273 | if (!dev) | |
2274 | goto type_disk; | |
2275 | ||
2276 | /* | |
2277 | * XXX_12 is not defined in SSC, throw an exception | |
2278 | */ | |
e3d6f909 AG |
2279 | if (dev->transport->get_device_type(dev) == TYPE_TAPE) { |
2280 | *ret = -EINVAL; | |
c66ac9db NB |
2281 | return 0; |
2282 | } | |
2283 | ||
2284 | /* | |
2285 | * Everything else assume TYPE_DISK Sector CDB location. | |
2286 | * Use 32-bit sector value. | |
2287 | */ | |
2288 | type_disk: | |
2289 | return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9]; | |
2290 | } | |
2291 | ||
2292 | static inline u32 transport_get_sectors_16( | |
2293 | unsigned char *cdb, | |
2294 | struct se_cmd *cmd, | |
2295 | int *ret) | |
2296 | { | |
5951146d | 2297 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
2298 | |
2299 | /* | |
2300 | * Assume TYPE_DISK for non struct se_device objects. | |
2301 | * Use 32-bit sector value. | |
2302 | */ | |
2303 | if (!dev) | |
2304 | goto type_disk; | |
2305 | ||
2306 | /* | |
2307 | * Use 24-bit allocation length for TYPE_TAPE. | |
2308 | */ | |
e3d6f909 | 2309 | if (dev->transport->get_device_type(dev) == TYPE_TAPE) |
c66ac9db NB |
2310 | return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14]; |
2311 | ||
2312 | type_disk: | |
2313 | return (u32)(cdb[10] << 24) + (cdb[11] << 16) + | |
2314 | (cdb[12] << 8) + cdb[13]; | |
2315 | } | |
2316 | ||
2317 | /* | |
2318 | * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants | |
2319 | */ | |
2320 | static inline u32 transport_get_sectors_32( | |
2321 | unsigned char *cdb, | |
2322 | struct se_cmd *cmd, | |
2323 | int *ret) | |
2324 | { | |
2325 | /* | |
2326 | * Assume TYPE_DISK for non struct se_device objects. | |
2327 | * Use 32-bit sector value. | |
2328 | */ | |
2329 | return (u32)(cdb[28] << 24) + (cdb[29] << 16) + | |
2330 | (cdb[30] << 8) + cdb[31]; | |
2331 | ||
2332 | } | |
2333 | ||
2334 | static inline u32 transport_get_size( | |
2335 | u32 sectors, | |
2336 | unsigned char *cdb, | |
2337 | struct se_cmd *cmd) | |
2338 | { | |
5951146d | 2339 | struct se_device *dev = cmd->se_dev; |
c66ac9db | 2340 | |
e3d6f909 | 2341 | if (dev->transport->get_device_type(dev) == TYPE_TAPE) { |
c66ac9db | 2342 | if (cdb[1] & 1) { /* sectors */ |
e3d6f909 | 2343 | return dev->se_sub_dev->se_dev_attrib.block_size * sectors; |
c66ac9db NB |
2344 | } else /* bytes */ |
2345 | return sectors; | |
2346 | } | |
2347 | #if 0 | |
6708bb27 | 2348 | pr_debug("Returning block_size: %u, sectors: %u == %u for" |
e3d6f909 AG |
2349 | " %s object\n", dev->se_sub_dev->se_dev_attrib.block_size, sectors, |
2350 | dev->se_sub_dev->se_dev_attrib.block_size * sectors, | |
2351 | dev->transport->name); | |
c66ac9db | 2352 | #endif |
e3d6f909 | 2353 | return dev->se_sub_dev->se_dev_attrib.block_size * sectors; |
c66ac9db NB |
2354 | } |
2355 | ||
c66ac9db NB |
2356 | static void transport_xor_callback(struct se_cmd *cmd) |
2357 | { | |
2358 | unsigned char *buf, *addr; | |
ec98f782 | 2359 | struct scatterlist *sg; |
c66ac9db NB |
2360 | unsigned int offset; |
2361 | int i; | |
ec98f782 | 2362 | int count; |
c66ac9db NB |
2363 | /* |
2364 | * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command | |
2365 | * | |
2366 | * 1) read the specified logical block(s); | |
2367 | * 2) transfer logical blocks from the data-out buffer; | |
2368 | * 3) XOR the logical blocks transferred from the data-out buffer with | |
2369 | * the logical blocks read, storing the resulting XOR data in a buffer; | |
2370 | * 4) if the DISABLE WRITE bit is set to zero, then write the logical | |
2371 | * blocks transferred from the data-out buffer; and | |
2372 | * 5) transfer the resulting XOR data to the data-in buffer. | |
2373 | */ | |
2374 | buf = kmalloc(cmd->data_length, GFP_KERNEL); | |
6708bb27 AG |
2375 | if (!buf) { |
2376 | pr_err("Unable to allocate xor_callback buf\n"); | |
c66ac9db NB |
2377 | return; |
2378 | } | |
2379 | /* | |
ec98f782 | 2380 | * Copy the scatterlist WRITE buffer located at cmd->t_data_sg |
c66ac9db NB |
2381 | * into the locally allocated *buf |
2382 | */ | |
ec98f782 AG |
2383 | sg_copy_to_buffer(cmd->t_data_sg, |
2384 | cmd->t_data_nents, | |
2385 | buf, | |
2386 | cmd->data_length); | |
2387 | ||
c66ac9db NB |
2388 | /* |
2389 | * Now perform the XOR against the BIDI read memory located at | |
a1d8b49a | 2390 | * cmd->t_mem_bidi_list |
c66ac9db NB |
2391 | */ |
2392 | ||
2393 | offset = 0; | |
ec98f782 AG |
2394 | for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) { |
2395 | addr = kmap_atomic(sg_page(sg), KM_USER0); | |
2396 | if (!addr) | |
c66ac9db NB |
2397 | goto out; |
2398 | ||
ec98f782 AG |
2399 | for (i = 0; i < sg->length; i++) |
2400 | *(addr + sg->offset + i) ^= *(buf + offset + i); | |
c66ac9db | 2401 | |
ec98f782 | 2402 | offset += sg->length; |
c66ac9db NB |
2403 | kunmap_atomic(addr, KM_USER0); |
2404 | } | |
ec98f782 | 2405 | |
c66ac9db NB |
2406 | out: |
2407 | kfree(buf); | |
2408 | } | |
2409 | ||
2410 | /* | |
2411 | * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd | |
2412 | */ | |
2413 | static int transport_get_sense_data(struct se_cmd *cmd) | |
2414 | { | |
2415 | unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL; | |
42bf829e | 2416 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
2417 | struct se_task *task = NULL, *task_tmp; |
2418 | unsigned long flags; | |
2419 | u32 offset = 0; | |
2420 | ||
e3d6f909 AG |
2421 | WARN_ON(!cmd->se_lun); |
2422 | ||
42bf829e CH |
2423 | if (!dev) |
2424 | return 0; | |
2425 | ||
a1d8b49a | 2426 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 2427 | if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) { |
a1d8b49a | 2428 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
2429 | return 0; |
2430 | } | |
2431 | ||
2432 | list_for_each_entry_safe(task, task_tmp, | |
a1d8b49a | 2433 | &cmd->t_task_list, t_list) { |
ef804a84 | 2434 | if (!(task->task_flags & TF_HAS_SENSE)) |
c66ac9db NB |
2435 | continue; |
2436 | ||
e3d6f909 | 2437 | if (!dev->transport->get_sense_buffer) { |
6708bb27 | 2438 | pr_err("dev->transport->get_sense_buffer" |
c66ac9db NB |
2439 | " is NULL\n"); |
2440 | continue; | |
2441 | } | |
2442 | ||
e3d6f909 | 2443 | sense_buffer = dev->transport->get_sense_buffer(task); |
6708bb27 | 2444 | if (!sense_buffer) { |
04629b7b | 2445 | pr_err("ITT[0x%08x]_TASK[%p]: Unable to locate" |
c66ac9db | 2446 | " sense buffer for task with sense\n", |
04629b7b | 2447 | cmd->se_tfo->get_task_tag(cmd), task); |
c66ac9db NB |
2448 | continue; |
2449 | } | |
a1d8b49a | 2450 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 2451 | |
e3d6f909 | 2452 | offset = cmd->se_tfo->set_fabric_sense_len(cmd, |
c66ac9db NB |
2453 | TRANSPORT_SENSE_BUFFER); |
2454 | ||
5951146d | 2455 | memcpy(&buffer[offset], sense_buffer, |
c66ac9db NB |
2456 | TRANSPORT_SENSE_BUFFER); |
2457 | cmd->scsi_status = task->task_scsi_status; | |
2458 | /* Automatically padded */ | |
2459 | cmd->scsi_sense_length = | |
2460 | (TRANSPORT_SENSE_BUFFER + offset); | |
2461 | ||
6708bb27 | 2462 | pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x" |
c66ac9db | 2463 | " and sense\n", |
e3d6f909 | 2464 | dev->se_hba->hba_id, dev->transport->name, |
c66ac9db NB |
2465 | cmd->scsi_status); |
2466 | return 0; | |
2467 | } | |
a1d8b49a | 2468 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
2469 | |
2470 | return -1; | |
2471 | } | |
2472 | ||
ec98f782 AG |
2473 | static inline long long transport_dev_end_lba(struct se_device *dev) |
2474 | { | |
2475 | return dev->transport->get_blocks(dev) + 1; | |
2476 | } | |
2477 | ||
2478 | static int transport_cmd_get_valid_sectors(struct se_cmd *cmd) | |
2479 | { | |
2480 | struct se_device *dev = cmd->se_dev; | |
2481 | u32 sectors; | |
2482 | ||
2483 | if (dev->transport->get_device_type(dev) != TYPE_DISK) | |
2484 | return 0; | |
2485 | ||
2486 | sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size); | |
2487 | ||
6708bb27 AG |
2488 | if ((cmd->t_task_lba + sectors) > transport_dev_end_lba(dev)) { |
2489 | pr_err("LBA: %llu Sectors: %u exceeds" | |
ec98f782 AG |
2490 | " transport_dev_end_lba(): %llu\n", |
2491 | cmd->t_task_lba, sectors, | |
2492 | transport_dev_end_lba(dev)); | |
7abbe7f3 | 2493 | return -EINVAL; |
ec98f782 AG |
2494 | } |
2495 | ||
7abbe7f3 | 2496 | return 0; |
ec98f782 AG |
2497 | } |
2498 | ||
706d5860 NB |
2499 | static int target_check_write_same_discard(unsigned char *flags, struct se_device *dev) |
2500 | { | |
2501 | /* | |
2502 | * Determine if the received WRITE_SAME is used to for direct | |
2503 | * passthrough into Linux/SCSI with struct request via TCM/pSCSI | |
2504 | * or we are signaling the use of internal WRITE_SAME + UNMAP=1 | |
2505 | * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code. | |
2506 | */ | |
2507 | int passthrough = (dev->transport->transport_type == | |
2508 | TRANSPORT_PLUGIN_PHBA_PDEV); | |
2509 | ||
2510 | if (!passthrough) { | |
2511 | if ((flags[0] & 0x04) || (flags[0] & 0x02)) { | |
2512 | pr_err("WRITE_SAME PBDATA and LBDATA" | |
2513 | " bits not supported for Block Discard" | |
2514 | " Emulation\n"); | |
2515 | return -ENOSYS; | |
2516 | } | |
2517 | /* | |
2518 | * Currently for the emulated case we only accept | |
2519 | * tpws with the UNMAP=1 bit set. | |
2520 | */ | |
2521 | if (!(flags[0] & 0x08)) { | |
2522 | pr_err("WRITE_SAME w/o UNMAP bit not" | |
2523 | " supported for Block Discard Emulation\n"); | |
2524 | return -ENOSYS; | |
2525 | } | |
2526 | } | |
2527 | ||
2528 | return 0; | |
2529 | } | |
2530 | ||
c66ac9db NB |
2531 | /* transport_generic_cmd_sequencer(): |
2532 | * | |
2533 | * Generic Command Sequencer that should work for most DAS transport | |
2534 | * drivers. | |
2535 | * | |
2536 | * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD | |
2537 | * RX Thread. | |
2538 | * | |
2539 | * FIXME: Need to support other SCSI OPCODES where as well. | |
2540 | */ | |
2541 | static int transport_generic_cmd_sequencer( | |
2542 | struct se_cmd *cmd, | |
2543 | unsigned char *cdb) | |
2544 | { | |
5951146d | 2545 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
2546 | struct se_subsystem_dev *su_dev = dev->se_sub_dev; |
2547 | int ret = 0, sector_ret = 0, passthrough; | |
2548 | u32 sectors = 0, size = 0, pr_reg_type = 0; | |
2549 | u16 service_action; | |
2550 | u8 alua_ascq = 0; | |
2551 | /* | |
2552 | * Check for an existing UNIT ATTENTION condition | |
2553 | */ | |
2554 | if (core_scsi3_ua_check(cmd, cdb) < 0) { | |
c66ac9db NB |
2555 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; |
2556 | cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION; | |
5951146d | 2557 | return -EINVAL; |
c66ac9db NB |
2558 | } |
2559 | /* | |
2560 | * Check status of Asymmetric Logical Unit Assignment port | |
2561 | */ | |
e3d6f909 | 2562 | ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq); |
c66ac9db | 2563 | if (ret != 0) { |
c66ac9db | 2564 | /* |
25985edc | 2565 | * Set SCSI additional sense code (ASC) to 'LUN Not Accessible'; |
c66ac9db NB |
2566 | * The ALUA additional sense code qualifier (ASCQ) is determined |
2567 | * by the ALUA primary or secondary access state.. | |
2568 | */ | |
2569 | if (ret > 0) { | |
2570 | #if 0 | |
6708bb27 | 2571 | pr_debug("[%s]: ALUA TG Port not available," |
c66ac9db | 2572 | " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n", |
e3d6f909 | 2573 | cmd->se_tfo->get_fabric_name(), alua_ascq); |
c66ac9db NB |
2574 | #endif |
2575 | transport_set_sense_codes(cmd, 0x04, alua_ascq); | |
2576 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
2577 | cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY; | |
5951146d | 2578 | return -EINVAL; |
c66ac9db NB |
2579 | } |
2580 | goto out_invalid_cdb_field; | |
2581 | } | |
2582 | /* | |
2583 | * Check status for SPC-3 Persistent Reservations | |
2584 | */ | |
e3d6f909 AG |
2585 | if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type) != 0) { |
2586 | if (su_dev->t10_pr.pr_ops.t10_seq_non_holder( | |
03e98c9e NB |
2587 | cmd, cdb, pr_reg_type) != 0) { |
2588 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
2589 | cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT; | |
2590 | cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; | |
2591 | return -EBUSY; | |
2592 | } | |
c66ac9db NB |
2593 | /* |
2594 | * This means the CDB is allowed for the SCSI Initiator port | |
2595 | * when said port is *NOT* holding the legacy SPC-2 or | |
2596 | * SPC-3 Persistent Reservation. | |
2597 | */ | |
2598 | } | |
2599 | ||
5bda90c8 CH |
2600 | /* |
2601 | * If we operate in passthrough mode we skip most CDB emulation and | |
2602 | * instead hand the commands down to the physical SCSI device. | |
2603 | */ | |
2604 | passthrough = | |
2605 | (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV); | |
2606 | ||
c66ac9db NB |
2607 | switch (cdb[0]) { |
2608 | case READ_6: | |
2609 | sectors = transport_get_sectors_6(cdb, cmd, §or_ret); | |
2610 | if (sector_ret) | |
2611 | goto out_unsupported_cdb; | |
2612 | size = transport_get_size(sectors, cdb, cmd); | |
a1d8b49a | 2613 | cmd->t_task_lba = transport_lba_21(cdb); |
c66ac9db NB |
2614 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2615 | break; | |
2616 | case READ_10: | |
2617 | sectors = transport_get_sectors_10(cdb, cmd, §or_ret); | |
2618 | if (sector_ret) | |
2619 | goto out_unsupported_cdb; | |
2620 | size = transport_get_size(sectors, cdb, cmd); | |
a1d8b49a | 2621 | cmd->t_task_lba = transport_lba_32(cdb); |
c66ac9db NB |
2622 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2623 | break; | |
2624 | case READ_12: | |
2625 | sectors = transport_get_sectors_12(cdb, cmd, §or_ret); | |
2626 | if (sector_ret) | |
2627 | goto out_unsupported_cdb; | |
2628 | size = transport_get_size(sectors, cdb, cmd); | |
a1d8b49a | 2629 | cmd->t_task_lba = transport_lba_32(cdb); |
c66ac9db NB |
2630 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2631 | break; | |
2632 | case READ_16: | |
2633 | sectors = transport_get_sectors_16(cdb, cmd, §or_ret); | |
2634 | if (sector_ret) | |
2635 | goto out_unsupported_cdb; | |
2636 | size = transport_get_size(sectors, cdb, cmd); | |
a1d8b49a | 2637 | cmd->t_task_lba = transport_lba_64(cdb); |
c66ac9db NB |
2638 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2639 | break; | |
2640 | case WRITE_6: | |
2641 | sectors = transport_get_sectors_6(cdb, cmd, §or_ret); | |
2642 | if (sector_ret) | |
2643 | goto out_unsupported_cdb; | |
2644 | size = transport_get_size(sectors, cdb, cmd); | |
a1d8b49a | 2645 | cmd->t_task_lba = transport_lba_21(cdb); |
c66ac9db NB |
2646 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2647 | break; | |
2648 | case WRITE_10: | |
2649 | sectors = transport_get_sectors_10(cdb, cmd, §or_ret); | |
2650 | if (sector_ret) | |
2651 | goto out_unsupported_cdb; | |
2652 | size = transport_get_size(sectors, cdb, cmd); | |
a1d8b49a | 2653 | cmd->t_task_lba = transport_lba_32(cdb); |
2d3a4b51 CH |
2654 | if (cdb[1] & 0x8) |
2655 | cmd->se_cmd_flags |= SCF_FUA; | |
c66ac9db NB |
2656 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2657 | break; | |
2658 | case WRITE_12: | |
2659 | sectors = transport_get_sectors_12(cdb, cmd, §or_ret); | |
2660 | if (sector_ret) | |
2661 | goto out_unsupported_cdb; | |
2662 | size = transport_get_size(sectors, cdb, cmd); | |
a1d8b49a | 2663 | cmd->t_task_lba = transport_lba_32(cdb); |
2d3a4b51 CH |
2664 | if (cdb[1] & 0x8) |
2665 | cmd->se_cmd_flags |= SCF_FUA; | |
c66ac9db NB |
2666 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2667 | break; | |
2668 | case WRITE_16: | |
2669 | sectors = transport_get_sectors_16(cdb, cmd, §or_ret); | |
2670 | if (sector_ret) | |
2671 | goto out_unsupported_cdb; | |
2672 | size = transport_get_size(sectors, cdb, cmd); | |
a1d8b49a | 2673 | cmd->t_task_lba = transport_lba_64(cdb); |
2d3a4b51 CH |
2674 | if (cdb[1] & 0x8) |
2675 | cmd->se_cmd_flags |= SCF_FUA; | |
c66ac9db NB |
2676 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2677 | break; | |
2678 | case XDWRITEREAD_10: | |
2679 | if ((cmd->data_direction != DMA_TO_DEVICE) || | |
33c3fafc | 2680 | !(cmd->se_cmd_flags & SCF_BIDI)) |
c66ac9db NB |
2681 | goto out_invalid_cdb_field; |
2682 | sectors = transport_get_sectors_10(cdb, cmd, §or_ret); | |
2683 | if (sector_ret) | |
2684 | goto out_unsupported_cdb; | |
2685 | size = transport_get_size(sectors, cdb, cmd); | |
a1d8b49a | 2686 | cmd->t_task_lba = transport_lba_32(cdb); |
c66ac9db | 2687 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
7c1c6af3 | 2688 | |
5bda90c8 CH |
2689 | /* |
2690 | * Do now allow BIDI commands for passthrough mode. | |
2691 | */ | |
2692 | if (passthrough) | |
7c1c6af3 | 2693 | goto out_unsupported_cdb; |
5bda90c8 | 2694 | |
c66ac9db | 2695 | /* |
35e0e757 | 2696 | * Setup BIDI XOR callback to be run after I/O completion. |
c66ac9db NB |
2697 | */ |
2698 | cmd->transport_complete_callback = &transport_xor_callback; | |
2d3a4b51 CH |
2699 | if (cdb[1] & 0x8) |
2700 | cmd->se_cmd_flags |= SCF_FUA; | |
c66ac9db NB |
2701 | break; |
2702 | case VARIABLE_LENGTH_CMD: | |
2703 | service_action = get_unaligned_be16(&cdb[8]); | |
c66ac9db NB |
2704 | switch (service_action) { |
2705 | case XDWRITEREAD_32: | |
2706 | sectors = transport_get_sectors_32(cdb, cmd, §or_ret); | |
2707 | if (sector_ret) | |
2708 | goto out_unsupported_cdb; | |
2709 | size = transport_get_size(sectors, cdb, cmd); | |
2710 | /* | |
2711 | * Use WRITE_32 and READ_32 opcodes for the emulated | |
2712 | * XDWRITE_READ_32 logic. | |
2713 | */ | |
a1d8b49a | 2714 | cmd->t_task_lba = transport_lba_64_ext(cdb); |
c66ac9db NB |
2715 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2716 | ||
5bda90c8 CH |
2717 | /* |
2718 | * Do now allow BIDI commands for passthrough mode. | |
2719 | */ | |
c66ac9db | 2720 | if (passthrough) |
7c1c6af3 | 2721 | goto out_unsupported_cdb; |
5bda90c8 | 2722 | |
c66ac9db | 2723 | /* |
35e0e757 CH |
2724 | * Setup BIDI XOR callback to be run during after I/O |
2725 | * completion. | |
c66ac9db NB |
2726 | */ |
2727 | cmd->transport_complete_callback = &transport_xor_callback; | |
2d3a4b51 CH |
2728 | if (cdb[1] & 0x8) |
2729 | cmd->se_cmd_flags |= SCF_FUA; | |
c66ac9db NB |
2730 | break; |
2731 | case WRITE_SAME_32: | |
2732 | sectors = transport_get_sectors_32(cdb, cmd, §or_ret); | |
2733 | if (sector_ret) | |
2734 | goto out_unsupported_cdb; | |
dd3a5ad8 | 2735 | |
6708bb27 | 2736 | if (sectors) |
12850626 | 2737 | size = transport_get_size(1, cdb, cmd); |
6708bb27 AG |
2738 | else { |
2739 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not" | |
2740 | " supported\n"); | |
2741 | goto out_invalid_cdb_field; | |
2742 | } | |
dd3a5ad8 | 2743 | |
a1d8b49a | 2744 | cmd->t_task_lba = get_unaligned_be64(&cdb[12]); |
c66ac9db NB |
2745 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
2746 | ||
706d5860 | 2747 | if (target_check_write_same_discard(&cdb[10], dev) < 0) |
67236c44 | 2748 | goto out_unsupported_cdb; |
5bda90c8 CH |
2749 | if (!passthrough) |
2750 | cmd->execute_task = target_emulate_write_same; | |
c66ac9db NB |
2751 | break; |
2752 | default: | |
6708bb27 | 2753 | pr_err("VARIABLE_LENGTH_CMD service action" |
c66ac9db NB |
2754 | " 0x%04x not supported\n", service_action); |
2755 | goto out_unsupported_cdb; | |
2756 | } | |
2757 | break; | |
e434f1f1 | 2758 | case MAINTENANCE_IN: |
e3d6f909 | 2759 | if (dev->transport->get_device_type(dev) != TYPE_ROM) { |
c66ac9db NB |
2760 | /* MAINTENANCE_IN from SCC-2 */ |
2761 | /* | |
2762 | * Check for emulated MI_REPORT_TARGET_PGS. | |
2763 | */ | |
e76a35d6 CH |
2764 | if (cdb[1] == MI_REPORT_TARGET_PGS && |
2765 | su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) { | |
2766 | cmd->execute_task = | |
2767 | target_emulate_report_target_port_groups; | |
c66ac9db NB |
2768 | } |
2769 | size = (cdb[6] << 24) | (cdb[7] << 16) | | |
2770 | (cdb[8] << 8) | cdb[9]; | |
2771 | } else { | |
2772 | /* GPCMD_SEND_KEY from multi media commands */ | |
2773 | size = (cdb[8] << 8) + cdb[9]; | |
2774 | } | |
05d1c7c0 | 2775 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2776 | break; |
2777 | case MODE_SELECT: | |
2778 | size = cdb[4]; | |
2779 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; | |
2780 | break; | |
2781 | case MODE_SELECT_10: | |
2782 | size = (cdb[7] << 8) + cdb[8]; | |
2783 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; | |
2784 | break; | |
2785 | case MODE_SENSE: | |
2786 | size = cdb[4]; | |
05d1c7c0 | 2787 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
5bda90c8 CH |
2788 | if (!passthrough) |
2789 | cmd->execute_task = target_emulate_modesense; | |
c66ac9db NB |
2790 | break; |
2791 | case MODE_SENSE_10: | |
5bda90c8 CH |
2792 | size = (cdb[7] << 8) + cdb[8]; |
2793 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; | |
2794 | if (!passthrough) | |
2795 | cmd->execute_task = target_emulate_modesense; | |
2796 | break; | |
c66ac9db NB |
2797 | case GPCMD_READ_BUFFER_CAPACITY: |
2798 | case GPCMD_SEND_OPC: | |
2799 | case LOG_SELECT: | |
2800 | case LOG_SENSE: | |
2801 | size = (cdb[7] << 8) + cdb[8]; | |
05d1c7c0 | 2802 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2803 | break; |
2804 | case READ_BLOCK_LIMITS: | |
2805 | size = READ_BLOCK_LEN; | |
05d1c7c0 | 2806 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2807 | break; |
2808 | case GPCMD_GET_CONFIGURATION: | |
2809 | case GPCMD_READ_FORMAT_CAPACITIES: | |
2810 | case GPCMD_READ_DISC_INFO: | |
2811 | case GPCMD_READ_TRACK_RZONE_INFO: | |
2812 | size = (cdb[7] << 8) + cdb[8]; | |
2813 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; | |
2814 | break; | |
2815 | case PERSISTENT_RESERVE_IN: | |
617c0e06 | 2816 | if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS) |
e76a35d6 | 2817 | cmd->execute_task = target_scsi3_emulate_pr_in; |
617c0e06 CH |
2818 | size = (cdb[7] << 8) + cdb[8]; |
2819 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; | |
2820 | break; | |
c66ac9db | 2821 | case PERSISTENT_RESERVE_OUT: |
617c0e06 | 2822 | if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS) |
e76a35d6 | 2823 | cmd->execute_task = target_scsi3_emulate_pr_out; |
c66ac9db | 2824 | size = (cdb[7] << 8) + cdb[8]; |
05d1c7c0 | 2825 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2826 | break; |
2827 | case GPCMD_MECHANISM_STATUS: | |
2828 | case GPCMD_READ_DVD_STRUCTURE: | |
2829 | size = (cdb[8] << 8) + cdb[9]; | |
2830 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; | |
2831 | break; | |
2832 | case READ_POSITION: | |
2833 | size = READ_POSITION_LEN; | |
05d1c7c0 | 2834 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db | 2835 | break; |
e434f1f1 | 2836 | case MAINTENANCE_OUT: |
e3d6f909 | 2837 | if (dev->transport->get_device_type(dev) != TYPE_ROM) { |
c66ac9db NB |
2838 | /* MAINTENANCE_OUT from SCC-2 |
2839 | * | |
2840 | * Check for emulated MO_SET_TARGET_PGS. | |
2841 | */ | |
e76a35d6 CH |
2842 | if (cdb[1] == MO_SET_TARGET_PGS && |
2843 | su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) { | |
2844 | cmd->execute_task = | |
2845 | target_emulate_set_target_port_groups; | |
c66ac9db NB |
2846 | } |
2847 | ||
2848 | size = (cdb[6] << 24) | (cdb[7] << 16) | | |
2849 | (cdb[8] << 8) | cdb[9]; | |
2850 | } else { | |
2851 | /* GPCMD_REPORT_KEY from multi media commands */ | |
2852 | size = (cdb[8] << 8) + cdb[9]; | |
2853 | } | |
05d1c7c0 | 2854 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2855 | break; |
2856 | case INQUIRY: | |
2857 | size = (cdb[3] << 8) + cdb[4]; | |
2858 | /* | |
2859 | * Do implict HEAD_OF_QUEUE processing for INQUIRY. | |
2860 | * See spc4r17 section 5.3 | |
2861 | */ | |
5951146d | 2862 | if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) |
e66ecd50 | 2863 | cmd->sam_task_attr = MSG_HEAD_TAG; |
05d1c7c0 | 2864 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
5bda90c8 CH |
2865 | if (!passthrough) |
2866 | cmd->execute_task = target_emulate_inquiry; | |
c66ac9db NB |
2867 | break; |
2868 | case READ_BUFFER: | |
2869 | size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8]; | |
05d1c7c0 | 2870 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2871 | break; |
2872 | case READ_CAPACITY: | |
2873 | size = READ_CAP_LEN; | |
05d1c7c0 | 2874 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
5bda90c8 CH |
2875 | if (!passthrough) |
2876 | cmd->execute_task = target_emulate_readcapacity; | |
c66ac9db NB |
2877 | break; |
2878 | case READ_MEDIA_SERIAL_NUMBER: | |
2879 | case SECURITY_PROTOCOL_IN: | |
2880 | case SECURITY_PROTOCOL_OUT: | |
2881 | size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; | |
05d1c7c0 | 2882 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2883 | break; |
2884 | case SERVICE_ACTION_IN: | |
5bda90c8 CH |
2885 | switch (cmd->t_task_cdb[1] & 0x1f) { |
2886 | case SAI_READ_CAPACITY_16: | |
2887 | if (!passthrough) | |
2888 | cmd->execute_task = | |
2889 | target_emulate_readcapacity_16; | |
2890 | break; | |
2891 | default: | |
2892 | if (passthrough) | |
2893 | break; | |
2894 | ||
2895 | pr_err("Unsupported SA: 0x%02x\n", | |
2896 | cmd->t_task_cdb[1] & 0x1f); | |
2897 | goto out_unsupported_cdb; | |
2898 | } | |
2899 | /*FALLTHROUGH*/ | |
c66ac9db NB |
2900 | case ACCESS_CONTROL_IN: |
2901 | case ACCESS_CONTROL_OUT: | |
2902 | case EXTENDED_COPY: | |
2903 | case READ_ATTRIBUTE: | |
2904 | case RECEIVE_COPY_RESULTS: | |
2905 | case WRITE_ATTRIBUTE: | |
2906 | size = (cdb[10] << 24) | (cdb[11] << 16) | | |
2907 | (cdb[12] << 8) | cdb[13]; | |
05d1c7c0 | 2908 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2909 | break; |
2910 | case RECEIVE_DIAGNOSTIC: | |
2911 | case SEND_DIAGNOSTIC: | |
2912 | size = (cdb[3] << 8) | cdb[4]; | |
05d1c7c0 | 2913 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2914 | break; |
2915 | /* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */ | |
2916 | #if 0 | |
2917 | case GPCMD_READ_CD: | |
2918 | sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8]; | |
2919 | size = (2336 * sectors); | |
05d1c7c0 | 2920 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2921 | break; |
2922 | #endif | |
2923 | case READ_TOC: | |
2924 | size = cdb[8]; | |
05d1c7c0 | 2925 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2926 | break; |
2927 | case REQUEST_SENSE: | |
2928 | size = cdb[4]; | |
05d1c7c0 | 2929 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
5bda90c8 CH |
2930 | if (!passthrough) |
2931 | cmd->execute_task = target_emulate_request_sense; | |
c66ac9db NB |
2932 | break; |
2933 | case READ_ELEMENT_STATUS: | |
2934 | size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9]; | |
05d1c7c0 | 2935 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2936 | break; |
2937 | case WRITE_BUFFER: | |
2938 | size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8]; | |
05d1c7c0 | 2939 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
2940 | break; |
2941 | case RESERVE: | |
2942 | case RESERVE_10: | |
2943 | /* | |
2944 | * The SPC-2 RESERVE does not contain a size in the SCSI CDB. | |
2945 | * Assume the passthrough or $FABRIC_MOD will tell us about it. | |
2946 | */ | |
2947 | if (cdb[0] == RESERVE_10) | |
2948 | size = (cdb[7] << 8) | cdb[8]; | |
2949 | else | |
2950 | size = cmd->data_length; | |
2951 | ||
2952 | /* | |
2953 | * Setup the legacy emulated handler for SPC-2 and | |
2954 | * >= SPC-3 compatible reservation handling (CRH=1) | |
2955 | * Otherwise, we assume the underlying SCSI logic is | |
2956 | * is running in SPC_PASSTHROUGH, and wants reservations | |
2957 | * emulation disabled. | |
2958 | */ | |
e76a35d6 CH |
2959 | if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH) |
2960 | cmd->execute_task = target_scsi2_reservation_reserve; | |
c66ac9db NB |
2961 | cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB; |
2962 | break; | |
2963 | case RELEASE: | |
2964 | case RELEASE_10: | |
2965 | /* | |
2966 | * The SPC-2 RELEASE does not contain a size in the SCSI CDB. | |
2967 | * Assume the passthrough or $FABRIC_MOD will tell us about it. | |
2968 | */ | |
2969 | if (cdb[0] == RELEASE_10) | |
2970 | size = (cdb[7] << 8) | cdb[8]; | |
2971 | else | |
2972 | size = cmd->data_length; | |
2973 | ||
e76a35d6 CH |
2974 | if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH) |
2975 | cmd->execute_task = target_scsi2_reservation_release; | |
c66ac9db NB |
2976 | cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB; |
2977 | break; | |
2978 | case SYNCHRONIZE_CACHE: | |
8e94b8db | 2979 | case SYNCHRONIZE_CACHE_16: |
c66ac9db NB |
2980 | /* |
2981 | * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE | |
2982 | */ | |
2983 | if (cdb[0] == SYNCHRONIZE_CACHE) { | |
2984 | sectors = transport_get_sectors_10(cdb, cmd, §or_ret); | |
a1d8b49a | 2985 | cmd->t_task_lba = transport_lba_32(cdb); |
c66ac9db NB |
2986 | } else { |
2987 | sectors = transport_get_sectors_16(cdb, cmd, §or_ret); | |
a1d8b49a | 2988 | cmd->t_task_lba = transport_lba_64(cdb); |
c66ac9db NB |
2989 | } |
2990 | if (sector_ret) | |
2991 | goto out_unsupported_cdb; | |
2992 | ||
2993 | size = transport_get_size(sectors, cdb, cmd); | |
2994 | cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB; | |
2995 | ||
5bda90c8 | 2996 | if (passthrough) |
c66ac9db | 2997 | break; |
5bda90c8 | 2998 | |
c66ac9db NB |
2999 | /* |
3000 | * Check to ensure that LBA + Range does not exceed past end of | |
7abbe7f3 | 3001 | * device for IBLOCK and FILEIO ->do_sync_cache() backend calls |
c66ac9db | 3002 | */ |
7abbe7f3 NB |
3003 | if ((cmd->t_task_lba != 0) || (sectors != 0)) { |
3004 | if (transport_cmd_get_valid_sectors(cmd) < 0) | |
3005 | goto out_invalid_cdb_field; | |
3006 | } | |
5bda90c8 | 3007 | cmd->execute_task = target_emulate_synchronize_cache; |
c66ac9db NB |
3008 | break; |
3009 | case UNMAP: | |
3010 | size = get_unaligned_be16(&cdb[7]); | |
05d1c7c0 | 3011 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
5bda90c8 CH |
3012 | if (!passthrough) |
3013 | cmd->execute_task = target_emulate_unmap; | |
c66ac9db NB |
3014 | break; |
3015 | case WRITE_SAME_16: | |
3016 | sectors = transport_get_sectors_16(cdb, cmd, §or_ret); | |
3017 | if (sector_ret) | |
3018 | goto out_unsupported_cdb; | |
dd3a5ad8 | 3019 | |
6708bb27 | 3020 | if (sectors) |
12850626 | 3021 | size = transport_get_size(1, cdb, cmd); |
6708bb27 AG |
3022 | else { |
3023 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); | |
3024 | goto out_invalid_cdb_field; | |
3025 | } | |
dd3a5ad8 | 3026 | |
5db0753b | 3027 | cmd->t_task_lba = get_unaligned_be64(&cdb[2]); |
706d5860 NB |
3028 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
3029 | ||
3030 | if (target_check_write_same_discard(&cdb[1], dev) < 0) | |
67236c44 | 3031 | goto out_unsupported_cdb; |
5bda90c8 CH |
3032 | if (!passthrough) |
3033 | cmd->execute_task = target_emulate_write_same; | |
706d5860 NB |
3034 | break; |
3035 | case WRITE_SAME: | |
3036 | sectors = transport_get_sectors_10(cdb, cmd, §or_ret); | |
3037 | if (sector_ret) | |
3038 | goto out_unsupported_cdb; | |
3039 | ||
3040 | if (sectors) | |
12850626 | 3041 | size = transport_get_size(1, cdb, cmd); |
706d5860 NB |
3042 | else { |
3043 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); | |
3044 | goto out_invalid_cdb_field; | |
c66ac9db | 3045 | } |
706d5860 NB |
3046 | |
3047 | cmd->t_task_lba = get_unaligned_be32(&cdb[2]); | |
c66ac9db | 3048 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
706d5860 NB |
3049 | /* |
3050 | * Follow sbcr26 with WRITE_SAME (10) and check for the existence | |
3051 | * of byte 1 bit 3 UNMAP instead of original reserved field | |
3052 | */ | |
3053 | if (target_check_write_same_discard(&cdb[1], dev) < 0) | |
67236c44 | 3054 | goto out_unsupported_cdb; |
5bda90c8 CH |
3055 | if (!passthrough) |
3056 | cmd->execute_task = target_emulate_write_same; | |
c66ac9db NB |
3057 | break; |
3058 | case ALLOW_MEDIUM_REMOVAL: | |
c66ac9db | 3059 | case ERASE: |
c66ac9db NB |
3060 | case REZERO_UNIT: |
3061 | case SEEK_10: | |
c66ac9db NB |
3062 | case SPACE: |
3063 | case START_STOP: | |
3064 | case TEST_UNIT_READY: | |
3065 | case VERIFY: | |
3066 | case WRITE_FILEMARKS: | |
5bda90c8 CH |
3067 | cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB; |
3068 | if (!passthrough) | |
3069 | cmd->execute_task = target_emulate_noop; | |
3070 | break; | |
3071 | case GPCMD_CLOSE_TRACK: | |
3072 | case INITIALIZE_ELEMENT_STATUS: | |
3073 | case GPCMD_LOAD_UNLOAD: | |
3074 | case GPCMD_SET_SPEED: | |
c66ac9db NB |
3075 | case MOVE_MEDIUM: |
3076 | cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB; | |
3077 | break; | |
3078 | case REPORT_LUNS: | |
e76a35d6 | 3079 | cmd->execute_task = target_report_luns; |
c66ac9db NB |
3080 | size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; |
3081 | /* | |
3082 | * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS | |
3083 | * See spc4r17 section 5.3 | |
3084 | */ | |
5951146d | 3085 | if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) |
e66ecd50 | 3086 | cmd->sam_task_attr = MSG_HEAD_TAG; |
05d1c7c0 | 3087 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
3088 | break; |
3089 | default: | |
6708bb27 | 3090 | pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode" |
c66ac9db | 3091 | " 0x%02x, sending CHECK_CONDITION.\n", |
e3d6f909 | 3092 | cmd->se_tfo->get_fabric_name(), cdb[0]); |
c66ac9db NB |
3093 | goto out_unsupported_cdb; |
3094 | } | |
3095 | ||
3096 | if (size != cmd->data_length) { | |
6708bb27 | 3097 | pr_warn("TARGET_CORE[%s]: Expected Transfer Length:" |
c66ac9db | 3098 | " %u does not match SCSI CDB Length: %u for SAM Opcode:" |
e3d6f909 | 3099 | " 0x%02x\n", cmd->se_tfo->get_fabric_name(), |
c66ac9db NB |
3100 | cmd->data_length, size, cdb[0]); |
3101 | ||
3102 | cmd->cmd_spdtl = size; | |
3103 | ||
3104 | if (cmd->data_direction == DMA_TO_DEVICE) { | |
6708bb27 | 3105 | pr_err("Rejecting underflow/overflow" |
c66ac9db NB |
3106 | " WRITE data\n"); |
3107 | goto out_invalid_cdb_field; | |
3108 | } | |
3109 | /* | |
3110 | * Reject READ_* or WRITE_* with overflow/underflow for | |
3111 | * type SCF_SCSI_DATA_SG_IO_CDB. | |
3112 | */ | |
6708bb27 AG |
3113 | if (!ret && (dev->se_sub_dev->se_dev_attrib.block_size != 512)) { |
3114 | pr_err("Failing OVERFLOW/UNDERFLOW for LBA op" | |
c66ac9db | 3115 | " CDB on non 512-byte sector setup subsystem" |
e3d6f909 | 3116 | " plugin: %s\n", dev->transport->name); |
c66ac9db NB |
3117 | /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */ |
3118 | goto out_invalid_cdb_field; | |
3119 | } | |
3120 | ||
3121 | if (size > cmd->data_length) { | |
3122 | cmd->se_cmd_flags |= SCF_OVERFLOW_BIT; | |
3123 | cmd->residual_count = (size - cmd->data_length); | |
3124 | } else { | |
3125 | cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT; | |
3126 | cmd->residual_count = (cmd->data_length - size); | |
3127 | } | |
3128 | cmd->data_length = size; | |
3129 | } | |
3130 | ||
015487b8 RD |
3131 | if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB && |
3132 | sectors > dev->se_sub_dev->se_dev_attrib.fabric_max_sectors) { | |
3133 | printk_ratelimited(KERN_ERR "SCSI OP %02xh with too big sectors %u\n", | |
3134 | cdb[0], sectors); | |
3135 | goto out_invalid_cdb_field; | |
3136 | } | |
3137 | ||
5bda90c8 CH |
3138 | /* reject any command that we don't have a handler for */ |
3139 | if (!(passthrough || cmd->execute_task || | |
3140 | (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB))) | |
3141 | goto out_unsupported_cdb; | |
3142 | ||
c66ac9db NB |
3143 | transport_set_supported_SAM_opcode(cmd); |
3144 | return ret; | |
3145 | ||
3146 | out_unsupported_cdb: | |
3147 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
3148 | cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; | |
5951146d | 3149 | return -EINVAL; |
c66ac9db NB |
3150 | out_invalid_cdb_field: |
3151 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
3152 | cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; | |
5951146d | 3153 | return -EINVAL; |
c66ac9db NB |
3154 | } |
3155 | ||
c66ac9db | 3156 | /* |
35e0e757 | 3157 | * Called from I/O completion to determine which dormant/delayed |
c66ac9db NB |
3158 | * and ordered cmds need to have their tasks added to the execution queue. |
3159 | */ | |
3160 | static void transport_complete_task_attr(struct se_cmd *cmd) | |
3161 | { | |
5951146d | 3162 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
3163 | struct se_cmd *cmd_p, *cmd_tmp; |
3164 | int new_active_tasks = 0; | |
3165 | ||
e66ecd50 | 3166 | if (cmd->sam_task_attr == MSG_SIMPLE_TAG) { |
c66ac9db NB |
3167 | atomic_dec(&dev->simple_cmds); |
3168 | smp_mb__after_atomic_dec(); | |
3169 | dev->dev_cur_ordered_id++; | |
6708bb27 | 3170 | pr_debug("Incremented dev->dev_cur_ordered_id: %u for" |
c66ac9db NB |
3171 | " SIMPLE: %u\n", dev->dev_cur_ordered_id, |
3172 | cmd->se_ordered_id); | |
e66ecd50 | 3173 | } else if (cmd->sam_task_attr == MSG_HEAD_TAG) { |
c66ac9db | 3174 | dev->dev_cur_ordered_id++; |
6708bb27 | 3175 | pr_debug("Incremented dev_cur_ordered_id: %u for" |
c66ac9db NB |
3176 | " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id, |
3177 | cmd->se_ordered_id); | |
e66ecd50 | 3178 | } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) { |
c66ac9db NB |
3179 | atomic_dec(&dev->dev_ordered_sync); |
3180 | smp_mb__after_atomic_dec(); | |
c66ac9db NB |
3181 | |
3182 | dev->dev_cur_ordered_id++; | |
6708bb27 | 3183 | pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:" |
c66ac9db NB |
3184 | " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id); |
3185 | } | |
3186 | /* | |
3187 | * Process all commands up to the last received | |
3188 | * ORDERED task attribute which requires another blocking | |
3189 | * boundary | |
3190 | */ | |
3191 | spin_lock(&dev->delayed_cmd_lock); | |
3192 | list_for_each_entry_safe(cmd_p, cmd_tmp, | |
5951146d | 3193 | &dev->delayed_cmd_list, se_delayed_node) { |
c66ac9db | 3194 | |
5951146d | 3195 | list_del(&cmd_p->se_delayed_node); |
c66ac9db NB |
3196 | spin_unlock(&dev->delayed_cmd_lock); |
3197 | ||
6708bb27 | 3198 | pr_debug("Calling add_tasks() for" |
c66ac9db NB |
3199 | " cmd_p: 0x%02x Task Attr: 0x%02x" |
3200 | " Dormant -> Active, se_ordered_id: %u\n", | |
6708bb27 | 3201 | cmd_p->t_task_cdb[0], |
c66ac9db NB |
3202 | cmd_p->sam_task_attr, cmd_p->se_ordered_id); |
3203 | ||
3204 | transport_add_tasks_from_cmd(cmd_p); | |
3205 | new_active_tasks++; | |
3206 | ||
3207 | spin_lock(&dev->delayed_cmd_lock); | |
e66ecd50 | 3208 | if (cmd_p->sam_task_attr == MSG_ORDERED_TAG) |
c66ac9db NB |
3209 | break; |
3210 | } | |
3211 | spin_unlock(&dev->delayed_cmd_lock); | |
3212 | /* | |
3213 | * If new tasks have become active, wake up the transport thread | |
3214 | * to do the processing of the Active tasks. | |
3215 | */ | |
3216 | if (new_active_tasks != 0) | |
e3d6f909 | 3217 | wake_up_interruptible(&dev->dev_queue_obj.thread_wq); |
c66ac9db NB |
3218 | } |
3219 | ||
e057f533 | 3220 | static void transport_complete_qf(struct se_cmd *cmd) |
07bde79a NB |
3221 | { |
3222 | int ret = 0; | |
3223 | ||
e057f533 CH |
3224 | if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) |
3225 | transport_complete_task_attr(cmd); | |
3226 | ||
3227 | if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) { | |
3228 | ret = cmd->se_tfo->queue_status(cmd); | |
3229 | if (ret) | |
3230 | goto out; | |
3231 | } | |
07bde79a NB |
3232 | |
3233 | switch (cmd->data_direction) { | |
3234 | case DMA_FROM_DEVICE: | |
3235 | ret = cmd->se_tfo->queue_data_in(cmd); | |
3236 | break; | |
3237 | case DMA_TO_DEVICE: | |
ec98f782 | 3238 | if (cmd->t_bidi_data_sg) { |
07bde79a NB |
3239 | ret = cmd->se_tfo->queue_data_in(cmd); |
3240 | if (ret < 0) | |
e057f533 | 3241 | break; |
07bde79a NB |
3242 | } |
3243 | /* Fall through for DMA_TO_DEVICE */ | |
3244 | case DMA_NONE: | |
3245 | ret = cmd->se_tfo->queue_status(cmd); | |
3246 | break; | |
3247 | default: | |
3248 | break; | |
3249 | } | |
3250 | ||
e057f533 CH |
3251 | out: |
3252 | if (ret < 0) { | |
3253 | transport_handle_queue_full(cmd, cmd->se_dev); | |
3254 | return; | |
3255 | } | |
3256 | transport_lun_remove_cmd(cmd); | |
3257 | transport_cmd_check_stop_to_fabric(cmd); | |
07bde79a NB |
3258 | } |
3259 | ||
3260 | static void transport_handle_queue_full( | |
3261 | struct se_cmd *cmd, | |
e057f533 | 3262 | struct se_device *dev) |
07bde79a NB |
3263 | { |
3264 | spin_lock_irq(&dev->qf_cmd_lock); | |
07bde79a NB |
3265 | list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list); |
3266 | atomic_inc(&dev->dev_qf_count); | |
3267 | smp_mb__after_atomic_inc(); | |
3268 | spin_unlock_irq(&cmd->se_dev->qf_cmd_lock); | |
3269 | ||
3270 | schedule_work(&cmd->se_dev->qf_work_queue); | |
3271 | } | |
3272 | ||
35e0e757 | 3273 | static void target_complete_ok_work(struct work_struct *work) |
c66ac9db | 3274 | { |
35e0e757 | 3275 | struct se_cmd *cmd = container_of(work, struct se_cmd, work); |
07bde79a | 3276 | int reason = 0, ret; |
35e0e757 | 3277 | |
c66ac9db NB |
3278 | /* |
3279 | * Check if we need to move delayed/dormant tasks from cmds on the | |
3280 | * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task | |
3281 | * Attribute. | |
3282 | */ | |
5951146d | 3283 | if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) |
c66ac9db | 3284 | transport_complete_task_attr(cmd); |
07bde79a NB |
3285 | /* |
3286 | * Check to schedule QUEUE_FULL work, or execute an existing | |
3287 | * cmd->transport_qf_callback() | |
3288 | */ | |
3289 | if (atomic_read(&cmd->se_dev->dev_qf_count) != 0) | |
3290 | schedule_work(&cmd->se_dev->qf_work_queue); | |
3291 | ||
c66ac9db NB |
3292 | /* |
3293 | * Check if we need to retrieve a sense buffer from | |
3294 | * the struct se_cmd in question. | |
3295 | */ | |
3296 | if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) { | |
3297 | if (transport_get_sense_data(cmd) < 0) | |
3298 | reason = TCM_NON_EXISTENT_LUN; | |
3299 | ||
3300 | /* | |
3301 | * Only set when an struct se_task->task_scsi_status returned | |
3302 | * a non GOOD status. | |
3303 | */ | |
3304 | if (cmd->scsi_status) { | |
07bde79a | 3305 | ret = transport_send_check_condition_and_sense( |
c66ac9db | 3306 | cmd, reason, 1); |
f147abb4 | 3307 | if (ret == -EAGAIN || ret == -ENOMEM) |
07bde79a NB |
3308 | goto queue_full; |
3309 | ||
c66ac9db NB |
3310 | transport_lun_remove_cmd(cmd); |
3311 | transport_cmd_check_stop_to_fabric(cmd); | |
3312 | return; | |
3313 | } | |
3314 | } | |
3315 | /* | |
25985edc | 3316 | * Check for a callback, used by amongst other things |
c66ac9db NB |
3317 | * XDWRITE_READ_10 emulation. |
3318 | */ | |
3319 | if (cmd->transport_complete_callback) | |
3320 | cmd->transport_complete_callback(cmd); | |
3321 | ||
3322 | switch (cmd->data_direction) { | |
3323 | case DMA_FROM_DEVICE: | |
3324 | spin_lock(&cmd->se_lun->lun_sep_lock); | |
e3d6f909 AG |
3325 | if (cmd->se_lun->lun_sep) { |
3326 | cmd->se_lun->lun_sep->sep_stats.tx_data_octets += | |
c66ac9db NB |
3327 | cmd->data_length; |
3328 | } | |
3329 | spin_unlock(&cmd->se_lun->lun_sep_lock); | |
c66ac9db | 3330 | |
07bde79a | 3331 | ret = cmd->se_tfo->queue_data_in(cmd); |
f147abb4 | 3332 | if (ret == -EAGAIN || ret == -ENOMEM) |
07bde79a | 3333 | goto queue_full; |
c66ac9db NB |
3334 | break; |
3335 | case DMA_TO_DEVICE: | |
3336 | spin_lock(&cmd->se_lun->lun_sep_lock); | |
e3d6f909 AG |
3337 | if (cmd->se_lun->lun_sep) { |
3338 | cmd->se_lun->lun_sep->sep_stats.rx_data_octets += | |
c66ac9db NB |
3339 | cmd->data_length; |
3340 | } | |
3341 | spin_unlock(&cmd->se_lun->lun_sep_lock); | |
3342 | /* | |
3343 | * Check if we need to send READ payload for BIDI-COMMAND | |
3344 | */ | |
ec98f782 | 3345 | if (cmd->t_bidi_data_sg) { |
c66ac9db | 3346 | spin_lock(&cmd->se_lun->lun_sep_lock); |
e3d6f909 AG |
3347 | if (cmd->se_lun->lun_sep) { |
3348 | cmd->se_lun->lun_sep->sep_stats.tx_data_octets += | |
c66ac9db NB |
3349 | cmd->data_length; |
3350 | } | |
3351 | spin_unlock(&cmd->se_lun->lun_sep_lock); | |
07bde79a | 3352 | ret = cmd->se_tfo->queue_data_in(cmd); |
f147abb4 | 3353 | if (ret == -EAGAIN || ret == -ENOMEM) |
07bde79a | 3354 | goto queue_full; |
c66ac9db NB |
3355 | break; |
3356 | } | |
3357 | /* Fall through for DMA_TO_DEVICE */ | |
3358 | case DMA_NONE: | |
07bde79a | 3359 | ret = cmd->se_tfo->queue_status(cmd); |
f147abb4 | 3360 | if (ret == -EAGAIN || ret == -ENOMEM) |
07bde79a | 3361 | goto queue_full; |
c66ac9db NB |
3362 | break; |
3363 | default: | |
3364 | break; | |
3365 | } | |
3366 | ||
3367 | transport_lun_remove_cmd(cmd); | |
3368 | transport_cmd_check_stop_to_fabric(cmd); | |
07bde79a NB |
3369 | return; |
3370 | ||
3371 | queue_full: | |
6708bb27 | 3372 | pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p," |
07bde79a | 3373 | " data_direction: %d\n", cmd, cmd->data_direction); |
e057f533 CH |
3374 | cmd->t_state = TRANSPORT_COMPLETE_QF_OK; |
3375 | transport_handle_queue_full(cmd, cmd->se_dev); | |
c66ac9db NB |
3376 | } |
3377 | ||
3378 | static void transport_free_dev_tasks(struct se_cmd *cmd) | |
3379 | { | |
3380 | struct se_task *task, *task_tmp; | |
3381 | unsigned long flags; | |
0c2cfe5f | 3382 | LIST_HEAD(dispose_list); |
c66ac9db | 3383 | |
a1d8b49a | 3384 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 3385 | list_for_each_entry_safe(task, task_tmp, |
a1d8b49a | 3386 | &cmd->t_task_list, t_list) { |
0c2cfe5f CH |
3387 | if (!(task->task_flags & TF_ACTIVE)) |
3388 | list_move_tail(&task->t_list, &dispose_list); | |
3389 | } | |
3390 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
3391 | ||
3392 | while (!list_empty(&dispose_list)) { | |
3393 | task = list_first_entry(&dispose_list, struct se_task, t_list); | |
c66ac9db | 3394 | |
af3f00c7 CH |
3395 | if (task->task_sg != cmd->t_data_sg && |
3396 | task->task_sg != cmd->t_bidi_data_sg) | |
3397 | kfree(task->task_sg); | |
c66ac9db NB |
3398 | |
3399 | list_del(&task->t_list); | |
3400 | ||
42bf829e | 3401 | cmd->se_dev->transport->free_task(task); |
c66ac9db | 3402 | } |
c66ac9db NB |
3403 | } |
3404 | ||
6708bb27 | 3405 | static inline void transport_free_sgl(struct scatterlist *sgl, int nents) |
c66ac9db | 3406 | { |
ec98f782 | 3407 | struct scatterlist *sg; |
ec98f782 | 3408 | int count; |
c66ac9db | 3409 | |
6708bb27 AG |
3410 | for_each_sg(sgl, sg, nents, count) |
3411 | __free_page(sg_page(sg)); | |
c66ac9db | 3412 | |
6708bb27 AG |
3413 | kfree(sgl); |
3414 | } | |
c66ac9db | 3415 | |
6708bb27 AG |
3416 | static inline void transport_free_pages(struct se_cmd *cmd) |
3417 | { | |
3418 | if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) | |
3419 | return; | |
3420 | ||
3421 | transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents); | |
ec98f782 AG |
3422 | cmd->t_data_sg = NULL; |
3423 | cmd->t_data_nents = 0; | |
c66ac9db | 3424 | |
6708bb27 | 3425 | transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents); |
ec98f782 AG |
3426 | cmd->t_bidi_data_sg = NULL; |
3427 | cmd->t_bidi_data_nents = 0; | |
c66ac9db NB |
3428 | } |
3429 | ||
e26d99ae CH |
3430 | /** |
3431 | * transport_release_cmd - free a command | |
3432 | * @cmd: command to free | |
3433 | * | |
3434 | * This routine unconditionally frees a command, and reference counting | |
3435 | * or list removal must be done in the caller. | |
3436 | */ | |
3437 | static void transport_release_cmd(struct se_cmd *cmd) | |
3438 | { | |
3439 | BUG_ON(!cmd->se_tfo); | |
3440 | ||
c8e31f26 | 3441 | if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB) |
e26d99ae CH |
3442 | core_tmr_release_req(cmd->se_tmr_req); |
3443 | if (cmd->t_task_cdb != cmd->__t_task_cdb) | |
3444 | kfree(cmd->t_task_cdb); | |
3445 | /* | |
7481deb4 NB |
3446 | * If this cmd has been setup with target_get_sess_cmd(), drop |
3447 | * the kref and call ->release_cmd() in kref callback. | |
e26d99ae | 3448 | */ |
7481deb4 NB |
3449 | if (cmd->check_release != 0) { |
3450 | target_put_sess_cmd(cmd->se_sess, cmd); | |
3451 | return; | |
3452 | } | |
e26d99ae CH |
3453 | cmd->se_tfo->release_cmd(cmd); |
3454 | } | |
3455 | ||
d3df7825 CH |
3456 | /** |
3457 | * transport_put_cmd - release a reference to a command | |
3458 | * @cmd: command to release | |
3459 | * | |
3460 | * This routine releases our reference to the command and frees it if possible. | |
3461 | */ | |
39c05f32 | 3462 | static void transport_put_cmd(struct se_cmd *cmd) |
c66ac9db NB |
3463 | { |
3464 | unsigned long flags; | |
4911e3cc | 3465 | int free_tasks = 0; |
c66ac9db | 3466 | |
a1d8b49a | 3467 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
4911e3cc CH |
3468 | if (atomic_read(&cmd->t_fe_count)) { |
3469 | if (!atomic_dec_and_test(&cmd->t_fe_count)) | |
3470 | goto out_busy; | |
3471 | } | |
3472 | ||
3473 | if (atomic_read(&cmd->t_se_count)) { | |
3474 | if (!atomic_dec_and_test(&cmd->t_se_count)) | |
3475 | goto out_busy; | |
3476 | } | |
3477 | ||
7d680f3b CH |
3478 | if (cmd->transport_state & CMD_T_DEV_ACTIVE) { |
3479 | cmd->transport_state &= ~CMD_T_DEV_ACTIVE; | |
4911e3cc CH |
3480 | transport_all_task_dev_remove_state(cmd); |
3481 | free_tasks = 1; | |
c66ac9db | 3482 | } |
a1d8b49a | 3483 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 3484 | |
4911e3cc CH |
3485 | if (free_tasks != 0) |
3486 | transport_free_dev_tasks(cmd); | |
d3df7825 | 3487 | |
c66ac9db | 3488 | transport_free_pages(cmd); |
31afc39c | 3489 | transport_release_cmd(cmd); |
39c05f32 | 3490 | return; |
4911e3cc CH |
3491 | out_busy: |
3492 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
c66ac9db NB |
3493 | } |
3494 | ||
c66ac9db | 3495 | /* |
ec98f782 AG |
3496 | * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of |
3497 | * allocating in the core. | |
c66ac9db NB |
3498 | * @cmd: Associated se_cmd descriptor |
3499 | * @mem: SGL style memory for TCM WRITE / READ | |
3500 | * @sg_mem_num: Number of SGL elements | |
3501 | * @mem_bidi_in: SGL style memory for TCM BIDI READ | |
3502 | * @sg_mem_bidi_num: Number of BIDI READ SGL elements | |
3503 | * | |
3504 | * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage | |
3505 | * of parameters. | |
3506 | */ | |
3507 | int transport_generic_map_mem_to_cmd( | |
3508 | struct se_cmd *cmd, | |
5951146d AG |
3509 | struct scatterlist *sgl, |
3510 | u32 sgl_count, | |
3511 | struct scatterlist *sgl_bidi, | |
3512 | u32 sgl_bidi_count) | |
c66ac9db | 3513 | { |
5951146d | 3514 | if (!sgl || !sgl_count) |
c66ac9db | 3515 | return 0; |
c66ac9db | 3516 | |
c66ac9db NB |
3517 | if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) || |
3518 | (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) { | |
fef58a60 NB |
3519 | /* |
3520 | * Reject SCSI data overflow with map_mem_to_cmd() as incoming | |
3521 | * scatterlists already have been set to follow what the fabric | |
3522 | * passes for the original expected data transfer length. | |
3523 | */ | |
3524 | if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) { | |
3525 | pr_warn("Rejecting SCSI DATA overflow for fabric using" | |
3526 | " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n"); | |
3527 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
3528 | cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; | |
3529 | return -EINVAL; | |
3530 | } | |
c66ac9db | 3531 | |
ec98f782 AG |
3532 | cmd->t_data_sg = sgl; |
3533 | cmd->t_data_nents = sgl_count; | |
c66ac9db | 3534 | |
ec98f782 AG |
3535 | if (sgl_bidi && sgl_bidi_count) { |
3536 | cmd->t_bidi_data_sg = sgl_bidi; | |
3537 | cmd->t_bidi_data_nents = sgl_bidi_count; | |
c66ac9db NB |
3538 | } |
3539 | cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC; | |
c66ac9db NB |
3540 | } |
3541 | ||
3542 | return 0; | |
3543 | } | |
3544 | EXPORT_SYMBOL(transport_generic_map_mem_to_cmd); | |
3545 | ||
4949314c | 3546 | void *transport_kmap_data_sg(struct se_cmd *cmd) |
05d1c7c0 | 3547 | { |
ec98f782 | 3548 | struct scatterlist *sg = cmd->t_data_sg; |
4949314c AG |
3549 | struct page **pages; |
3550 | int i; | |
05d1c7c0 | 3551 | |
ec98f782 | 3552 | BUG_ON(!sg); |
05d1c7c0 | 3553 | /* |
ec98f782 AG |
3554 | * We need to take into account a possible offset here for fabrics like |
3555 | * tcm_loop who may be using a contig buffer from the SCSI midlayer for | |
3556 | * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd() | |
05d1c7c0 | 3557 | */ |
4949314c AG |
3558 | if (!cmd->t_data_nents) |
3559 | return NULL; | |
3560 | else if (cmd->t_data_nents == 1) | |
3561 | return kmap(sg_page(sg)) + sg->offset; | |
3562 | ||
3563 | /* >1 page. use vmap */ | |
3564 | pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL); | |
3565 | if (!pages) | |
3566 | return NULL; | |
3567 | ||
3568 | /* convert sg[] to pages[] */ | |
3569 | for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) { | |
3570 | pages[i] = sg_page(sg); | |
3571 | } | |
3572 | ||
3573 | cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL); | |
3574 | kfree(pages); | |
3575 | if (!cmd->t_data_vmap) | |
3576 | return NULL; | |
3577 | ||
3578 | return cmd->t_data_vmap + cmd->t_data_sg[0].offset; | |
05d1c7c0 | 3579 | } |
4949314c | 3580 | EXPORT_SYMBOL(transport_kmap_data_sg); |
05d1c7c0 | 3581 | |
4949314c | 3582 | void transport_kunmap_data_sg(struct se_cmd *cmd) |
05d1c7c0 | 3583 | { |
a1edf9cf | 3584 | if (!cmd->t_data_nents) { |
4949314c | 3585 | return; |
a1edf9cf | 3586 | } else if (cmd->t_data_nents == 1) { |
4949314c | 3587 | kunmap(sg_page(cmd->t_data_sg)); |
a1edf9cf AG |
3588 | return; |
3589 | } | |
4949314c AG |
3590 | |
3591 | vunmap(cmd->t_data_vmap); | |
3592 | cmd->t_data_vmap = NULL; | |
05d1c7c0 | 3593 | } |
4949314c | 3594 | EXPORT_SYMBOL(transport_kunmap_data_sg); |
05d1c7c0 | 3595 | |
c66ac9db | 3596 | static int |
05d1c7c0 | 3597 | transport_generic_get_mem(struct se_cmd *cmd) |
c66ac9db | 3598 | { |
ec98f782 AG |
3599 | u32 length = cmd->data_length; |
3600 | unsigned int nents; | |
3601 | struct page *page; | |
9db9da33 | 3602 | gfp_t zero_flag; |
ec98f782 | 3603 | int i = 0; |
c66ac9db | 3604 | |
ec98f782 AG |
3605 | nents = DIV_ROUND_UP(length, PAGE_SIZE); |
3606 | cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL); | |
3607 | if (!cmd->t_data_sg) | |
3608 | return -ENOMEM; | |
c66ac9db | 3609 | |
ec98f782 AG |
3610 | cmd->t_data_nents = nents; |
3611 | sg_init_table(cmd->t_data_sg, nents); | |
c66ac9db | 3612 | |
9db9da33 | 3613 | zero_flag = cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB ? 0 : __GFP_ZERO; |
3614 | ||
ec98f782 AG |
3615 | while (length) { |
3616 | u32 page_len = min_t(u32, length, PAGE_SIZE); | |
9db9da33 | 3617 | page = alloc_page(GFP_KERNEL | zero_flag); |
ec98f782 AG |
3618 | if (!page) |
3619 | goto out; | |
c66ac9db | 3620 | |
ec98f782 AG |
3621 | sg_set_page(&cmd->t_data_sg[i], page, page_len, 0); |
3622 | length -= page_len; | |
3623 | i++; | |
c66ac9db | 3624 | } |
c66ac9db | 3625 | return 0; |
c66ac9db | 3626 | |
ec98f782 AG |
3627 | out: |
3628 | while (i >= 0) { | |
3629 | __free_page(sg_page(&cmd->t_data_sg[i])); | |
3630 | i--; | |
c66ac9db | 3631 | } |
ec98f782 AG |
3632 | kfree(cmd->t_data_sg); |
3633 | cmd->t_data_sg = NULL; | |
3634 | return -ENOMEM; | |
c66ac9db NB |
3635 | } |
3636 | ||
a1d8b49a AG |
3637 | /* Reduce sectors if they are too long for the device */ |
3638 | static inline sector_t transport_limit_task_sectors( | |
c66ac9db NB |
3639 | struct se_device *dev, |
3640 | unsigned long long lba, | |
a1d8b49a | 3641 | sector_t sectors) |
c66ac9db | 3642 | { |
a1d8b49a | 3643 | sectors = min_t(sector_t, sectors, dev->se_sub_dev->se_dev_attrib.max_sectors); |
c66ac9db | 3644 | |
a1d8b49a AG |
3645 | if (dev->transport->get_device_type(dev) == TYPE_DISK) |
3646 | if ((lba + sectors) > transport_dev_end_lba(dev)) | |
3647 | sectors = ((transport_dev_end_lba(dev) - lba) + 1); | |
c66ac9db | 3648 | |
a1d8b49a | 3649 | return sectors; |
c66ac9db NB |
3650 | } |
3651 | ||
c66ac9db NB |
3652 | |
3653 | /* | |
3654 | * This function can be used by HW target mode drivers to create a linked | |
3655 | * scatterlist from all contiguously allocated struct se_task->task_sg[]. | |
3656 | * This is intended to be called during the completion path by TCM Core | |
3657 | * when struct target_core_fabric_ops->check_task_sg_chaining is enabled. | |
3658 | */ | |
3659 | void transport_do_task_sg_chain(struct se_cmd *cmd) | |
3660 | { | |
ec98f782 AG |
3661 | struct scatterlist *sg_first = NULL; |
3662 | struct scatterlist *sg_prev = NULL; | |
3663 | int sg_prev_nents = 0; | |
3664 | struct scatterlist *sg; | |
c66ac9db | 3665 | struct se_task *task; |
ec98f782 | 3666 | u32 chained_nents = 0; |
c66ac9db NB |
3667 | int i; |
3668 | ||
ec98f782 AG |
3669 | BUG_ON(!cmd->se_tfo->task_sg_chaining); |
3670 | ||
c66ac9db NB |
3671 | /* |
3672 | * Walk the struct se_task list and setup scatterlist chains | |
a1d8b49a | 3673 | * for each contiguously allocated struct se_task->task_sg[]. |
c66ac9db | 3674 | */ |
a1d8b49a | 3675 | list_for_each_entry(task, &cmd->t_task_list, t_list) { |
ec98f782 | 3676 | if (!task->task_sg) |
c66ac9db NB |
3677 | continue; |
3678 | ||
ec98f782 AG |
3679 | if (!sg_first) { |
3680 | sg_first = task->task_sg; | |
6708bb27 | 3681 | chained_nents = task->task_sg_nents; |
97868c89 | 3682 | } else { |
ec98f782 | 3683 | sg_chain(sg_prev, sg_prev_nents, task->task_sg); |
6708bb27 | 3684 | chained_nents += task->task_sg_nents; |
97868c89 | 3685 | } |
c3c74c7a NB |
3686 | /* |
3687 | * For the padded tasks, use the extra SGL vector allocated | |
3688 | * in transport_allocate_data_tasks() for the sg_prev_nents | |
04629b7b CH |
3689 | * offset into sg_chain() above. |
3690 | * | |
3691 | * We do not need the padding for the last task (or a single | |
3692 | * task), but in that case we will never use the sg_prev_nents | |
3693 | * value below which would be incorrect. | |
c3c74c7a | 3694 | */ |
04629b7b | 3695 | sg_prev_nents = (task->task_sg_nents + 1); |
ec98f782 | 3696 | sg_prev = task->task_sg; |
c66ac9db NB |
3697 | } |
3698 | /* | |
3699 | * Setup the starting pointer and total t_tasks_sg_linked_no including | |
3700 | * padding SGs for linking and to mark the end. | |
3701 | */ | |
a1d8b49a | 3702 | cmd->t_tasks_sg_chained = sg_first; |
ec98f782 | 3703 | cmd->t_tasks_sg_chained_no = chained_nents; |
c66ac9db | 3704 | |
6708bb27 | 3705 | pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and" |
a1d8b49a AG |
3706 | " t_tasks_sg_chained_no: %u\n", cmd, cmd->t_tasks_sg_chained, |
3707 | cmd->t_tasks_sg_chained_no); | |
c66ac9db | 3708 | |
a1d8b49a AG |
3709 | for_each_sg(cmd->t_tasks_sg_chained, sg, |
3710 | cmd->t_tasks_sg_chained_no, i) { | |
c66ac9db | 3711 | |
6708bb27 | 3712 | pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n", |
5951146d | 3713 | i, sg, sg_page(sg), sg->length, sg->offset); |
c66ac9db | 3714 | if (sg_is_chain(sg)) |
6708bb27 | 3715 | pr_debug("SG: %p sg_is_chain=1\n", sg); |
c66ac9db | 3716 | if (sg_is_last(sg)) |
6708bb27 | 3717 | pr_debug("SG: %p sg_is_last=1\n", sg); |
c66ac9db | 3718 | } |
c66ac9db NB |
3719 | } |
3720 | EXPORT_SYMBOL(transport_do_task_sg_chain); | |
3721 | ||
a1d8b49a AG |
3722 | /* |
3723 | * Break up cmd into chunks transport can handle | |
3724 | */ | |
38b40067 CH |
3725 | static int |
3726 | transport_allocate_data_tasks(struct se_cmd *cmd, | |
c66ac9db | 3727 | enum dma_data_direction data_direction, |
38b40067 | 3728 | struct scatterlist *cmd_sg, unsigned int sgl_nents) |
c66ac9db | 3729 | { |
5951146d | 3730 | struct se_device *dev = cmd->se_dev; |
a3eedc22 | 3731 | int task_count, i; |
38b40067 CH |
3732 | unsigned long long lba; |
3733 | sector_t sectors, dev_max_sectors; | |
3734 | u32 sector_size; | |
3735 | ||
3736 | if (transport_cmd_get_valid_sectors(cmd) < 0) | |
3737 | return -EINVAL; | |
3738 | ||
3739 | dev_max_sectors = dev->se_sub_dev->se_dev_attrib.max_sectors; | |
3740 | sector_size = dev->se_sub_dev->se_dev_attrib.block_size; | |
a1d8b49a | 3741 | |
ec98f782 | 3742 | WARN_ON(cmd->data_length % sector_size); |
38b40067 CH |
3743 | |
3744 | lba = cmd->t_task_lba; | |
ec98f782 | 3745 | sectors = DIV_ROUND_UP(cmd->data_length, sector_size); |
277c5f27 | 3746 | task_count = DIV_ROUND_UP_SECTOR_T(sectors, dev_max_sectors); |
af3f00c7 CH |
3747 | |
3748 | /* | |
3749 | * If we need just a single task reuse the SG list in the command | |
3750 | * and avoid a lot of work. | |
3751 | */ | |
3752 | if (task_count == 1) { | |
3753 | struct se_task *task; | |
3754 | unsigned long flags; | |
3755 | ||
3756 | task = transport_generic_get_task(cmd, data_direction); | |
3757 | if (!task) | |
3758 | return -ENOMEM; | |
3759 | ||
3760 | task->task_sg = cmd_sg; | |
3761 | task->task_sg_nents = sgl_nents; | |
3762 | ||
3763 | task->task_lba = lba; | |
3764 | task->task_sectors = sectors; | |
3765 | task->task_size = task->task_sectors * sector_size; | |
3766 | ||
3767 | spin_lock_irqsave(&cmd->t_state_lock, flags); | |
3768 | list_add_tail(&task->t_list, &cmd->t_task_list); | |
3769 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
3770 | ||
3771 | return task_count; | |
3772 | } | |
3773 | ||
ec98f782 | 3774 | for (i = 0; i < task_count; i++) { |
38b40067 | 3775 | struct se_task *task; |
c3c74c7a | 3776 | unsigned int task_size, task_sg_nents_padded; |
38b40067 CH |
3777 | struct scatterlist *sg; |
3778 | unsigned long flags; | |
ec98f782 | 3779 | int count; |
a1d8b49a | 3780 | |
c66ac9db | 3781 | task = transport_generic_get_task(cmd, data_direction); |
a1d8b49a | 3782 | if (!task) |
ec98f782 | 3783 | return -ENOMEM; |
c66ac9db | 3784 | |
c66ac9db | 3785 | task->task_lba = lba; |
ec98f782 AG |
3786 | task->task_sectors = min(sectors, dev_max_sectors); |
3787 | task->task_size = task->task_sectors * sector_size; | |
c66ac9db | 3788 | |
525a48a2 NB |
3789 | /* |
3790 | * This now assumes that passed sg_ents are in PAGE_SIZE chunks | |
3791 | * in order to calculate the number per task SGL entries | |
3792 | */ | |
3793 | task->task_sg_nents = DIV_ROUND_UP(task->task_size, PAGE_SIZE); | |
c66ac9db | 3794 | /* |
ec98f782 AG |
3795 | * Check if the fabric module driver is requesting that all |
3796 | * struct se_task->task_sg[] be chained together.. If so, | |
3797 | * then allocate an extra padding SG entry for linking and | |
c3c74c7a NB |
3798 | * marking the end of the chained SGL for every task except |
3799 | * the last one for (task_count > 1) operation, or skipping | |
3800 | * the extra padding for the (task_count == 1) case. | |
c66ac9db | 3801 | */ |
c3c74c7a NB |
3802 | if (cmd->se_tfo->task_sg_chaining && (i < (task_count - 1))) { |
3803 | task_sg_nents_padded = (task->task_sg_nents + 1); | |
c3c74c7a NB |
3804 | } else |
3805 | task_sg_nents_padded = task->task_sg_nents; | |
c66ac9db | 3806 | |
1d20bb61 | 3807 | task->task_sg = kmalloc(sizeof(struct scatterlist) * |
c3c74c7a | 3808 | task_sg_nents_padded, GFP_KERNEL); |
ec98f782 AG |
3809 | if (!task->task_sg) { |
3810 | cmd->se_dev->transport->free_task(task); | |
3811 | return -ENOMEM; | |
3812 | } | |
3813 | ||
c3c74c7a | 3814 | sg_init_table(task->task_sg, task_sg_nents_padded); |
c66ac9db | 3815 | |
ec98f782 AG |
3816 | task_size = task->task_size; |
3817 | ||
3818 | /* Build new sgl, only up to task_size */ | |
6708bb27 | 3819 | for_each_sg(task->task_sg, sg, task->task_sg_nents, count) { |
ec98f782 AG |
3820 | if (cmd_sg->length > task_size) |
3821 | break; | |
3822 | ||
3823 | *sg = *cmd_sg; | |
3824 | task_size -= cmd_sg->length; | |
3825 | cmd_sg = sg_next(cmd_sg); | |
c66ac9db | 3826 | } |
c66ac9db | 3827 | |
ec98f782 AG |
3828 | lba += task->task_sectors; |
3829 | sectors -= task->task_sectors; | |
c66ac9db | 3830 | |
ec98f782 AG |
3831 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
3832 | list_add_tail(&task->t_list, &cmd->t_task_list); | |
3833 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
c66ac9db NB |
3834 | } |
3835 | ||
ec98f782 | 3836 | return task_count; |
c66ac9db NB |
3837 | } |
3838 | ||
3839 | static int | |
ec98f782 | 3840 | transport_allocate_control_task(struct se_cmd *cmd) |
c66ac9db | 3841 | { |
c66ac9db | 3842 | struct se_task *task; |
ec98f782 | 3843 | unsigned long flags; |
c66ac9db | 3844 | |
91ec1d35 NB |
3845 | /* Workaround for handling zero-length control CDBs */ |
3846 | if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) && | |
3847 | !cmd->data_length) | |
3848 | return 0; | |
3849 | ||
c66ac9db NB |
3850 | task = transport_generic_get_task(cmd, cmd->data_direction); |
3851 | if (!task) | |
ec98f782 | 3852 | return -ENOMEM; |
c66ac9db | 3853 | |
af3f00c7 | 3854 | task->task_sg = cmd->t_data_sg; |
c66ac9db | 3855 | task->task_size = cmd->data_length; |
6708bb27 | 3856 | task->task_sg_nents = cmd->t_data_nents; |
c66ac9db | 3857 | |
ec98f782 AG |
3858 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
3859 | list_add_tail(&task->t_list, &cmd->t_task_list); | |
3860 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
c66ac9db | 3861 | |
6708bb27 | 3862 | /* Success! Return number of tasks allocated */ |
a3eedc22 | 3863 | return 1; |
ec98f782 AG |
3864 | } |
3865 | ||
da0f7619 CH |
3866 | /* |
3867 | * Allocate any required ressources to execute the command, and either place | |
3868 | * it on the execution queue if possible. For writes we might not have the | |
3869 | * payload yet, thus notify the fabric via a call to ->write_pending instead. | |
c66ac9db | 3870 | */ |
a1d8b49a | 3871 | int transport_generic_new_cmd(struct se_cmd *cmd) |
c66ac9db | 3872 | { |
da0f7619 | 3873 | struct se_device *dev = cmd->se_dev; |
9ac54987 | 3874 | int task_cdbs, task_cdbs_bidi = 0; |
da0f7619 | 3875 | int set_counts = 1; |
c66ac9db NB |
3876 | int ret = 0; |
3877 | ||
3878 | /* | |
3879 | * Determine is the TCM fabric module has already allocated physical | |
3880 | * memory, and is directly calling transport_generic_map_mem_to_cmd() | |
ec98f782 | 3881 | * beforehand. |
c66ac9db | 3882 | */ |
ec98f782 AG |
3883 | if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) && |
3884 | cmd->data_length) { | |
05d1c7c0 | 3885 | ret = transport_generic_get_mem(cmd); |
c66ac9db | 3886 | if (ret < 0) |
03e98c9e | 3887 | goto out_fail; |
c66ac9db | 3888 | } |
da0f7619 | 3889 | |
1d20bb61 | 3890 | /* |
38b40067 | 3891 | * For BIDI command set up the read tasks first. |
1d20bb61 | 3892 | */ |
da0f7619 | 3893 | if (cmd->t_bidi_data_sg && |
38b40067 CH |
3894 | dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) { |
3895 | BUG_ON(!(cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)); | |
3896 | ||
9ac54987 NB |
3897 | task_cdbs_bidi = transport_allocate_data_tasks(cmd, |
3898 | DMA_FROM_DEVICE, cmd->t_bidi_data_sg, | |
3899 | cmd->t_bidi_data_nents); | |
3900 | if (task_cdbs_bidi <= 0) | |
da0f7619 CH |
3901 | goto out_fail; |
3902 | ||
3903 | atomic_inc(&cmd->t_fe_count); | |
3904 | atomic_inc(&cmd->t_se_count); | |
3905 | set_counts = 0; | |
3906 | } | |
38b40067 CH |
3907 | |
3908 | if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) { | |
3909 | task_cdbs = transport_allocate_data_tasks(cmd, | |
3910 | cmd->data_direction, cmd->t_data_sg, | |
3911 | cmd->t_data_nents); | |
3912 | } else { | |
3913 | task_cdbs = transport_allocate_control_task(cmd); | |
3914 | } | |
3915 | ||
410f6702 | 3916 | if (task_cdbs < 0) |
da0f7619 | 3917 | goto out_fail; |
410f6702 | 3918 | else if (!task_cdbs && (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)) { |
7d680f3b | 3919 | spin_lock_irq(&cmd->t_state_lock); |
410f6702 | 3920 | cmd->t_state = TRANSPORT_COMPLETE; |
7d680f3b CH |
3921 | cmd->transport_state |= CMD_T_ACTIVE; |
3922 | spin_unlock_irq(&cmd->t_state_lock); | |
91ec1d35 NB |
3923 | |
3924 | if (cmd->t_task_cdb[0] == REQUEST_SENSE) { | |
3925 | u8 ua_asc = 0, ua_ascq = 0; | |
3926 | ||
3927 | core_scsi3_ua_clear_for_request_sense(cmd, | |
3928 | &ua_asc, &ua_ascq); | |
3929 | } | |
3930 | ||
410f6702 RD |
3931 | INIT_WORK(&cmd->work, target_complete_ok_work); |
3932 | queue_work(target_completion_wq, &cmd->work); | |
3933 | return 0; | |
3934 | } | |
da0f7619 CH |
3935 | |
3936 | if (set_counts) { | |
3937 | atomic_inc(&cmd->t_fe_count); | |
3938 | atomic_inc(&cmd->t_se_count); | |
3939 | } | |
3940 | ||
9ac54987 NB |
3941 | cmd->t_task_list_num = (task_cdbs + task_cdbs_bidi); |
3942 | atomic_set(&cmd->t_task_cdbs_left, cmd->t_task_list_num); | |
3943 | atomic_set(&cmd->t_task_cdbs_ex_left, cmd->t_task_list_num); | |
da0f7619 | 3944 | |
c66ac9db | 3945 | /* |
a1d8b49a | 3946 | * For WRITEs, let the fabric know its buffer is ready.. |
c66ac9db NB |
3947 | * This WRITE struct se_cmd (and all of its associated struct se_task's) |
3948 | * will be added to the struct se_device execution queue after its WRITE | |
3949 | * data has arrived. (ie: It gets handled by the transport processing | |
3950 | * thread a second time) | |
3951 | */ | |
3952 | if (cmd->data_direction == DMA_TO_DEVICE) { | |
3953 | transport_add_tasks_to_state_queue(cmd); | |
3954 | return transport_generic_write_pending(cmd); | |
3955 | } | |
3956 | /* | |
3957 | * Everything else but a WRITE, add the struct se_cmd's struct se_task's | |
3958 | * to the execution queue. | |
3959 | */ | |
3960 | transport_execute_tasks(cmd); | |
3961 | return 0; | |
da0f7619 CH |
3962 | |
3963 | out_fail: | |
3964 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
3965 | cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
3966 | return -EINVAL; | |
c66ac9db | 3967 | } |
a1d8b49a | 3968 | EXPORT_SYMBOL(transport_generic_new_cmd); |
c66ac9db NB |
3969 | |
3970 | /* transport_generic_process_write(): | |
3971 | * | |
3972 | * | |
3973 | */ | |
3974 | void transport_generic_process_write(struct se_cmd *cmd) | |
3975 | { | |
c66ac9db NB |
3976 | transport_execute_tasks(cmd); |
3977 | } | |
3978 | EXPORT_SYMBOL(transport_generic_process_write); | |
3979 | ||
e057f533 | 3980 | static void transport_write_pending_qf(struct se_cmd *cmd) |
07bde79a | 3981 | { |
f147abb4 NB |
3982 | int ret; |
3983 | ||
3984 | ret = cmd->se_tfo->write_pending(cmd); | |
3985 | if (ret == -EAGAIN || ret == -ENOMEM) { | |
e057f533 CH |
3986 | pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", |
3987 | cmd); | |
3988 | transport_handle_queue_full(cmd, cmd->se_dev); | |
3989 | } | |
07bde79a NB |
3990 | } |
3991 | ||
c66ac9db NB |
3992 | static int transport_generic_write_pending(struct se_cmd *cmd) |
3993 | { | |
3994 | unsigned long flags; | |
3995 | int ret; | |
3996 | ||
a1d8b49a | 3997 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 3998 | cmd->t_state = TRANSPORT_WRITE_PENDING; |
a1d8b49a | 3999 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
07bde79a | 4000 | |
c66ac9db NB |
4001 | /* |
4002 | * Clear the se_cmd for WRITE_PENDING status in order to set | |
7d680f3b CH |
4003 | * CMD_T_ACTIVE so that transport_generic_handle_data can be called |
4004 | * from HW target mode interrupt code. This is safe to be called | |
4005 | * with transport_off=1 before the cmd->se_tfo->write_pending | |
c66ac9db NB |
4006 | * because the se_cmd->se_lun pointer is not being cleared. |
4007 | */ | |
4008 | transport_cmd_check_stop(cmd, 1, 0); | |
4009 | ||
4010 | /* | |
4011 | * Call the fabric write_pending function here to let the | |
4012 | * frontend know that WRITE buffers are ready. | |
4013 | */ | |
e3d6f909 | 4014 | ret = cmd->se_tfo->write_pending(cmd); |
f147abb4 | 4015 | if (ret == -EAGAIN || ret == -ENOMEM) |
07bde79a NB |
4016 | goto queue_full; |
4017 | else if (ret < 0) | |
c66ac9db NB |
4018 | return ret; |
4019 | ||
03e98c9e | 4020 | return 1; |
07bde79a NB |
4021 | |
4022 | queue_full: | |
6708bb27 | 4023 | pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd); |
07bde79a | 4024 | cmd->t_state = TRANSPORT_COMPLETE_QF_WP; |
e057f533 | 4025 | transport_handle_queue_full(cmd, cmd->se_dev); |
f147abb4 | 4026 | return 0; |
c66ac9db NB |
4027 | } |
4028 | ||
39c05f32 | 4029 | void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks) |
c66ac9db | 4030 | { |
d14921d6 | 4031 | if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) { |
c8e31f26 | 4032 | if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) |
d14921d6 NB |
4033 | transport_wait_for_tasks(cmd); |
4034 | ||
35462975 | 4035 | transport_release_cmd(cmd); |
d14921d6 NB |
4036 | } else { |
4037 | if (wait_for_tasks) | |
4038 | transport_wait_for_tasks(cmd); | |
4039 | ||
c66ac9db NB |
4040 | core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd); |
4041 | ||
82f1c8a4 | 4042 | if (cmd->se_lun) |
c66ac9db | 4043 | transport_lun_remove_cmd(cmd); |
c66ac9db | 4044 | |
f4366772 NB |
4045 | transport_free_dev_tasks(cmd); |
4046 | ||
39c05f32 | 4047 | transport_put_cmd(cmd); |
c66ac9db NB |
4048 | } |
4049 | } | |
4050 | EXPORT_SYMBOL(transport_generic_free_cmd); | |
4051 | ||
a17f091d NB |
4052 | /* target_get_sess_cmd - Add command to active ->sess_cmd_list |
4053 | * @se_sess: session to reference | |
4054 | * @se_cmd: command descriptor to add | |
a6360785 | 4055 | * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd() |
a17f091d | 4056 | */ |
a6360785 NB |
4057 | void target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd, |
4058 | bool ack_kref) | |
a17f091d NB |
4059 | { |
4060 | unsigned long flags; | |
4061 | ||
7481deb4 | 4062 | kref_init(&se_cmd->cmd_kref); |
a6360785 NB |
4063 | /* |
4064 | * Add a second kref if the fabric caller is expecting to handle | |
4065 | * fabric acknowledgement that requires two target_put_sess_cmd() | |
4066 | * invocations before se_cmd descriptor release. | |
4067 | */ | |
86715569 | 4068 | if (ack_kref == true) { |
a6360785 | 4069 | kref_get(&se_cmd->cmd_kref); |
86715569 NB |
4070 | se_cmd->se_cmd_flags |= SCF_ACK_KREF; |
4071 | } | |
7481deb4 | 4072 | |
a17f091d NB |
4073 | spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); |
4074 | list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list); | |
4075 | se_cmd->check_release = 1; | |
4076 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); | |
4077 | } | |
4078 | EXPORT_SYMBOL(target_get_sess_cmd); | |
4079 | ||
7481deb4 | 4080 | static void target_release_cmd_kref(struct kref *kref) |
a17f091d | 4081 | { |
7481deb4 NB |
4082 | struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref); |
4083 | struct se_session *se_sess = se_cmd->se_sess; | |
a17f091d NB |
4084 | unsigned long flags; |
4085 | ||
4086 | spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); | |
4087 | if (list_empty(&se_cmd->se_cmd_list)) { | |
4088 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); | |
ffc32d52 | 4089 | se_cmd->se_tfo->release_cmd(se_cmd); |
7481deb4 | 4090 | return; |
a17f091d | 4091 | } |
a17f091d NB |
4092 | if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) { |
4093 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); | |
4094 | complete(&se_cmd->cmd_wait_comp); | |
7481deb4 | 4095 | return; |
a17f091d NB |
4096 | } |
4097 | list_del(&se_cmd->se_cmd_list); | |
4098 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); | |
4099 | ||
7481deb4 NB |
4100 | se_cmd->se_tfo->release_cmd(se_cmd); |
4101 | } | |
4102 | ||
4103 | /* target_put_sess_cmd - Check for active I/O shutdown via kref_put | |
4104 | * @se_sess: session to reference | |
4105 | * @se_cmd: command descriptor to drop | |
4106 | */ | |
4107 | int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd) | |
4108 | { | |
4109 | return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref); | |
a17f091d NB |
4110 | } |
4111 | EXPORT_SYMBOL(target_put_sess_cmd); | |
4112 | ||
4113 | /* target_splice_sess_cmd_list - Split active cmds into sess_wait_list | |
4114 | * @se_sess: session to split | |
4115 | */ | |
4116 | void target_splice_sess_cmd_list(struct se_session *se_sess) | |
4117 | { | |
4118 | struct se_cmd *se_cmd; | |
4119 | unsigned long flags; | |
4120 | ||
4121 | WARN_ON(!list_empty(&se_sess->sess_wait_list)); | |
4122 | INIT_LIST_HEAD(&se_sess->sess_wait_list); | |
4123 | ||
4124 | spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); | |
4125 | se_sess->sess_tearing_down = 1; | |
4126 | ||
4127 | list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list); | |
4128 | ||
4129 | list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list) | |
4130 | se_cmd->cmd_wait_set = 1; | |
4131 | ||
4132 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); | |
4133 | } | |
4134 | EXPORT_SYMBOL(target_splice_sess_cmd_list); | |
4135 | ||
4136 | /* target_wait_for_sess_cmds - Wait for outstanding descriptors | |
4137 | * @se_sess: session to wait for active I/O | |
4138 | * @wait_for_tasks: Make extra transport_wait_for_tasks call | |
4139 | */ | |
4140 | void target_wait_for_sess_cmds( | |
4141 | struct se_session *se_sess, | |
4142 | int wait_for_tasks) | |
4143 | { | |
4144 | struct se_cmd *se_cmd, *tmp_cmd; | |
4145 | bool rc = false; | |
4146 | ||
4147 | list_for_each_entry_safe(se_cmd, tmp_cmd, | |
4148 | &se_sess->sess_wait_list, se_cmd_list) { | |
4149 | list_del(&se_cmd->se_cmd_list); | |
4150 | ||
4151 | pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:" | |
4152 | " %d\n", se_cmd, se_cmd->t_state, | |
4153 | se_cmd->se_tfo->get_cmd_state(se_cmd)); | |
4154 | ||
4155 | if (wait_for_tasks) { | |
4156 | pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d," | |
4157 | " fabric state: %d\n", se_cmd, se_cmd->t_state, | |
4158 | se_cmd->se_tfo->get_cmd_state(se_cmd)); | |
4159 | ||
4160 | rc = transport_wait_for_tasks(se_cmd); | |
4161 | ||
4162 | pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d," | |
4163 | " fabric state: %d\n", se_cmd, se_cmd->t_state, | |
4164 | se_cmd->se_tfo->get_cmd_state(se_cmd)); | |
4165 | } | |
4166 | ||
4167 | if (!rc) { | |
4168 | wait_for_completion(&se_cmd->cmd_wait_comp); | |
4169 | pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d" | |
4170 | " fabric state: %d\n", se_cmd, se_cmd->t_state, | |
4171 | se_cmd->se_tfo->get_cmd_state(se_cmd)); | |
4172 | } | |
4173 | ||
4174 | se_cmd->se_tfo->release_cmd(se_cmd); | |
4175 | } | |
4176 | } | |
4177 | EXPORT_SYMBOL(target_wait_for_sess_cmds); | |
4178 | ||
c66ac9db NB |
4179 | /* transport_lun_wait_for_tasks(): |
4180 | * | |
4181 | * Called from ConfigFS context to stop the passed struct se_cmd to allow | |
4182 | * an struct se_lun to be successfully shutdown. | |
4183 | */ | |
4184 | static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun) | |
4185 | { | |
4186 | unsigned long flags; | |
4187 | int ret; | |
4188 | /* | |
4189 | * If the frontend has already requested this struct se_cmd to | |
4190 | * be stopped, we can safely ignore this struct se_cmd. | |
4191 | */ | |
a1d8b49a | 4192 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
7d680f3b CH |
4193 | if (cmd->transport_state & CMD_T_STOP) { |
4194 | cmd->transport_state &= ~CMD_T_LUN_STOP; | |
4195 | ||
4196 | pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n", | |
4197 | cmd->se_tfo->get_task_tag(cmd)); | |
a1d8b49a | 4198 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 4199 | transport_cmd_check_stop(cmd, 1, 0); |
e3d6f909 | 4200 | return -EPERM; |
c66ac9db | 4201 | } |
7d680f3b | 4202 | cmd->transport_state |= CMD_T_LUN_FE_STOP; |
a1d8b49a | 4203 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 4204 | |
5951146d | 4205 | wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq); |
c66ac9db NB |
4206 | |
4207 | ret = transport_stop_tasks_for_cmd(cmd); | |
4208 | ||
6708bb27 AG |
4209 | pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:" |
4210 | " %d\n", cmd, cmd->t_task_list_num, ret); | |
c66ac9db | 4211 | if (!ret) { |
6708bb27 | 4212 | pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n", |
e3d6f909 | 4213 | cmd->se_tfo->get_task_tag(cmd)); |
a1d8b49a | 4214 | wait_for_completion(&cmd->transport_lun_stop_comp); |
6708bb27 | 4215 | pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n", |
e3d6f909 | 4216 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 4217 | } |
3df8d40b | 4218 | transport_remove_cmd_from_queue(cmd); |
c66ac9db NB |
4219 | |
4220 | return 0; | |
4221 | } | |
4222 | ||
c66ac9db NB |
4223 | static void __transport_clear_lun_from_sessions(struct se_lun *lun) |
4224 | { | |
4225 | struct se_cmd *cmd = NULL; | |
4226 | unsigned long lun_flags, cmd_flags; | |
4227 | /* | |
4228 | * Do exception processing and return CHECK_CONDITION status to the | |
4229 | * Initiator Port. | |
4230 | */ | |
4231 | spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags); | |
5951146d AG |
4232 | while (!list_empty(&lun->lun_cmd_list)) { |
4233 | cmd = list_first_entry(&lun->lun_cmd_list, | |
4234 | struct se_cmd, se_lun_node); | |
3d26fea0 | 4235 | list_del_init(&cmd->se_lun_node); |
5951146d | 4236 | |
c66ac9db NB |
4237 | /* |
4238 | * This will notify iscsi_target_transport.c: | |
4239 | * transport_cmd_check_stop() that a LUN shutdown is in | |
4240 | * progress for the iscsi_cmd_t. | |
4241 | */ | |
a1d8b49a | 4242 | spin_lock(&cmd->t_state_lock); |
6708bb27 | 4243 | pr_debug("SE_LUN[%d] - Setting cmd->transport" |
c66ac9db | 4244 | "_lun_stop for ITT: 0x%08x\n", |
e3d6f909 AG |
4245 | cmd->se_lun->unpacked_lun, |
4246 | cmd->se_tfo->get_task_tag(cmd)); | |
7d680f3b | 4247 | cmd->transport_state |= CMD_T_LUN_STOP; |
a1d8b49a | 4248 | spin_unlock(&cmd->t_state_lock); |
c66ac9db NB |
4249 | |
4250 | spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags); | |
4251 | ||
6708bb27 AG |
4252 | if (!cmd->se_lun) { |
4253 | pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n", | |
e3d6f909 AG |
4254 | cmd->se_tfo->get_task_tag(cmd), |
4255 | cmd->se_tfo->get_cmd_state(cmd), cmd->t_state); | |
c66ac9db NB |
4256 | BUG(); |
4257 | } | |
4258 | /* | |
4259 | * If the Storage engine still owns the iscsi_cmd_t, determine | |
4260 | * and/or stop its context. | |
4261 | */ | |
6708bb27 | 4262 | pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport" |
e3d6f909 AG |
4263 | "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun, |
4264 | cmd->se_tfo->get_task_tag(cmd)); | |
c66ac9db | 4265 | |
e3d6f909 | 4266 | if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) { |
c66ac9db NB |
4267 | spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags); |
4268 | continue; | |
4269 | } | |
4270 | ||
6708bb27 | 4271 | pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun" |
c66ac9db | 4272 | "_wait_for_tasks(): SUCCESS\n", |
e3d6f909 AG |
4273 | cmd->se_lun->unpacked_lun, |
4274 | cmd->se_tfo->get_task_tag(cmd)); | |
c66ac9db | 4275 | |
a1d8b49a | 4276 | spin_lock_irqsave(&cmd->t_state_lock, cmd_flags); |
7d680f3b | 4277 | if (!(cmd->transport_state & CMD_T_DEV_ACTIVE)) { |
a1d8b49a | 4278 | spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags); |
c66ac9db NB |
4279 | goto check_cond; |
4280 | } | |
7d680f3b | 4281 | cmd->transport_state &= ~CMD_T_DEV_ACTIVE; |
c66ac9db | 4282 | transport_all_task_dev_remove_state(cmd); |
a1d8b49a | 4283 | spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags); |
c66ac9db NB |
4284 | |
4285 | transport_free_dev_tasks(cmd); | |
4286 | /* | |
4287 | * The Storage engine stopped this struct se_cmd before it was | |
4288 | * send to the fabric frontend for delivery back to the | |
4289 | * Initiator Node. Return this SCSI CDB back with an | |
4290 | * CHECK_CONDITION status. | |
4291 | */ | |
4292 | check_cond: | |
4293 | transport_send_check_condition_and_sense(cmd, | |
4294 | TCM_NON_EXISTENT_LUN, 0); | |
4295 | /* | |
4296 | * If the fabric frontend is waiting for this iscsi_cmd_t to | |
4297 | * be released, notify the waiting thread now that LU has | |
4298 | * finished accessing it. | |
4299 | */ | |
a1d8b49a | 4300 | spin_lock_irqsave(&cmd->t_state_lock, cmd_flags); |
7d680f3b | 4301 | if (cmd->transport_state & CMD_T_LUN_FE_STOP) { |
6708bb27 | 4302 | pr_debug("SE_LUN[%d] - Detected FE stop for" |
c66ac9db NB |
4303 | " struct se_cmd: %p ITT: 0x%08x\n", |
4304 | lun->unpacked_lun, | |
e3d6f909 | 4305 | cmd, cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 4306 | |
a1d8b49a | 4307 | spin_unlock_irqrestore(&cmd->t_state_lock, |
c66ac9db NB |
4308 | cmd_flags); |
4309 | transport_cmd_check_stop(cmd, 1, 0); | |
a1d8b49a | 4310 | complete(&cmd->transport_lun_fe_stop_comp); |
c66ac9db NB |
4311 | spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags); |
4312 | continue; | |
4313 | } | |
6708bb27 | 4314 | pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n", |
e3d6f909 | 4315 | lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 4316 | |
a1d8b49a | 4317 | spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags); |
c66ac9db NB |
4318 | spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags); |
4319 | } | |
4320 | spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags); | |
4321 | } | |
4322 | ||
4323 | static int transport_clear_lun_thread(void *p) | |
4324 | { | |
8359cf43 | 4325 | struct se_lun *lun = p; |
c66ac9db NB |
4326 | |
4327 | __transport_clear_lun_from_sessions(lun); | |
4328 | complete(&lun->lun_shutdown_comp); | |
4329 | ||
4330 | return 0; | |
4331 | } | |
4332 | ||
4333 | int transport_clear_lun_from_sessions(struct se_lun *lun) | |
4334 | { | |
4335 | struct task_struct *kt; | |
4336 | ||
5951146d | 4337 | kt = kthread_run(transport_clear_lun_thread, lun, |
c66ac9db NB |
4338 | "tcm_cl_%u", lun->unpacked_lun); |
4339 | if (IS_ERR(kt)) { | |
6708bb27 | 4340 | pr_err("Unable to start clear_lun thread\n"); |
e3d6f909 | 4341 | return PTR_ERR(kt); |
c66ac9db NB |
4342 | } |
4343 | wait_for_completion(&lun->lun_shutdown_comp); | |
4344 | ||
4345 | return 0; | |
4346 | } | |
4347 | ||
d14921d6 NB |
4348 | /** |
4349 | * transport_wait_for_tasks - wait for completion to occur | |
4350 | * @cmd: command to wait | |
c66ac9db | 4351 | * |
d14921d6 NB |
4352 | * Called from frontend fabric context to wait for storage engine |
4353 | * to pause and/or release frontend generated struct se_cmd. | |
c66ac9db | 4354 | */ |
a17f091d | 4355 | bool transport_wait_for_tasks(struct se_cmd *cmd) |
c66ac9db NB |
4356 | { |
4357 | unsigned long flags; | |
4358 | ||
a1d8b49a | 4359 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c8e31f26 AG |
4360 | if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && |
4361 | !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) { | |
d14921d6 | 4362 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
a17f091d | 4363 | return false; |
d14921d6 NB |
4364 | } |
4365 | /* | |
4366 | * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE | |
4367 | * has been set in transport_set_supported_SAM_opcode(). | |
4368 | */ | |
c8e31f26 AG |
4369 | if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) && |
4370 | !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) { | |
d14921d6 | 4371 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
a17f091d | 4372 | return false; |
d14921d6 | 4373 | } |
c66ac9db NB |
4374 | /* |
4375 | * If we are already stopped due to an external event (ie: LUN shutdown) | |
4376 | * sleep until the connection can have the passed struct se_cmd back. | |
a1d8b49a | 4377 | * The cmd->transport_lun_stopped_sem will be upped by |
c66ac9db NB |
4378 | * transport_clear_lun_from_sessions() once the ConfigFS context caller |
4379 | * has completed its operation on the struct se_cmd. | |
4380 | */ | |
7d680f3b | 4381 | if (cmd->transport_state & CMD_T_LUN_STOP) { |
6708bb27 | 4382 | pr_debug("wait_for_tasks: Stopping" |
e3d6f909 | 4383 | " wait_for_completion(&cmd->t_tasktransport_lun_fe" |
c66ac9db | 4384 | "_stop_comp); for ITT: 0x%08x\n", |
e3d6f909 | 4385 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db NB |
4386 | /* |
4387 | * There is a special case for WRITES where a FE exception + | |
4388 | * LUN shutdown means ConfigFS context is still sleeping on | |
4389 | * transport_lun_stop_comp in transport_lun_wait_for_tasks(). | |
4390 | * We go ahead and up transport_lun_stop_comp just to be sure | |
4391 | * here. | |
4392 | */ | |
a1d8b49a AG |
4393 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
4394 | complete(&cmd->transport_lun_stop_comp); | |
4395 | wait_for_completion(&cmd->transport_lun_fe_stop_comp); | |
4396 | spin_lock_irqsave(&cmd->t_state_lock, flags); | |
c66ac9db NB |
4397 | |
4398 | transport_all_task_dev_remove_state(cmd); | |
4399 | /* | |
4400 | * At this point, the frontend who was the originator of this | |
4401 | * struct se_cmd, now owns the structure and can be released through | |
4402 | * normal means below. | |
4403 | */ | |
6708bb27 | 4404 | pr_debug("wait_for_tasks: Stopped" |
e3d6f909 | 4405 | " wait_for_completion(&cmd->t_tasktransport_lun_fe_" |
c66ac9db | 4406 | "stop_comp); for ITT: 0x%08x\n", |
e3d6f909 | 4407 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 4408 | |
7d680f3b | 4409 | cmd->transport_state &= ~CMD_T_LUN_STOP; |
c66ac9db | 4410 | } |
7d680f3b | 4411 | |
3d28934a | 4412 | if (!(cmd->transport_state & CMD_T_ACTIVE)) { |
d14921d6 | 4413 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
a17f091d | 4414 | return false; |
d14921d6 | 4415 | } |
c66ac9db | 4416 | |
7d680f3b | 4417 | cmd->transport_state |= CMD_T_STOP; |
c66ac9db | 4418 | |
6708bb27 | 4419 | pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x" |
7d680f3b | 4420 | " i_state: %d, t_state: %d, CMD_T_STOP\n", |
f2da9dbd CH |
4421 | cmd, cmd->se_tfo->get_task_tag(cmd), |
4422 | cmd->se_tfo->get_cmd_state(cmd), cmd->t_state); | |
c66ac9db | 4423 | |
a1d8b49a | 4424 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 4425 | |
5951146d | 4426 | wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq); |
c66ac9db | 4427 | |
a1d8b49a | 4428 | wait_for_completion(&cmd->t_transport_stop_comp); |
c66ac9db | 4429 | |
a1d8b49a | 4430 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
7d680f3b | 4431 | cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP); |
c66ac9db | 4432 | |
6708bb27 | 4433 | pr_debug("wait_for_tasks: Stopped wait_for_compltion(" |
a1d8b49a | 4434 | "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n", |
e3d6f909 | 4435 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 4436 | |
d14921d6 | 4437 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
a17f091d NB |
4438 | |
4439 | return true; | |
c66ac9db | 4440 | } |
d14921d6 | 4441 | EXPORT_SYMBOL(transport_wait_for_tasks); |
c66ac9db NB |
4442 | |
4443 | static int transport_get_sense_codes( | |
4444 | struct se_cmd *cmd, | |
4445 | u8 *asc, | |
4446 | u8 *ascq) | |
4447 | { | |
4448 | *asc = cmd->scsi_asc; | |
4449 | *ascq = cmd->scsi_ascq; | |
4450 | ||
4451 | return 0; | |
4452 | } | |
4453 | ||
4454 | static int transport_set_sense_codes( | |
4455 | struct se_cmd *cmd, | |
4456 | u8 asc, | |
4457 | u8 ascq) | |
4458 | { | |
4459 | cmd->scsi_asc = asc; | |
4460 | cmd->scsi_ascq = ascq; | |
4461 | ||
4462 | return 0; | |
4463 | } | |
4464 | ||
4465 | int transport_send_check_condition_and_sense( | |
4466 | struct se_cmd *cmd, | |
4467 | u8 reason, | |
4468 | int from_transport) | |
4469 | { | |
4470 | unsigned char *buffer = cmd->sense_buffer; | |
4471 | unsigned long flags; | |
4472 | int offset; | |
4473 | u8 asc = 0, ascq = 0; | |
4474 | ||
a1d8b49a | 4475 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 4476 | if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) { |
a1d8b49a | 4477 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
4478 | return 0; |
4479 | } | |
4480 | cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION; | |
a1d8b49a | 4481 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
4482 | |
4483 | if (!reason && from_transport) | |
4484 | goto after_reason; | |
4485 | ||
4486 | if (!from_transport) | |
4487 | cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE; | |
4488 | /* | |
4489 | * Data Segment and SenseLength of the fabric response PDU. | |
4490 | * | |
4491 | * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE | |
4492 | * from include/scsi/scsi_cmnd.h | |
4493 | */ | |
e3d6f909 | 4494 | offset = cmd->se_tfo->set_fabric_sense_len(cmd, |
c66ac9db NB |
4495 | TRANSPORT_SENSE_BUFFER); |
4496 | /* | |
4497 | * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses | |
4498 | * SENSE KEY values from include/scsi/scsi.h | |
4499 | */ | |
4500 | switch (reason) { | |
4501 | case TCM_NON_EXISTENT_LUN: | |
eb39d340 NB |
4502 | /* CURRENT ERROR */ |
4503 | buffer[offset] = 0x70; | |
895f3022 | 4504 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
eb39d340 NB |
4505 | /* ILLEGAL REQUEST */ |
4506 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; | |
4507 | /* LOGICAL UNIT NOT SUPPORTED */ | |
4508 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25; | |
4509 | break; | |
c66ac9db NB |
4510 | case TCM_UNSUPPORTED_SCSI_OPCODE: |
4511 | case TCM_SECTOR_COUNT_TOO_MANY: | |
4512 | /* CURRENT ERROR */ | |
4513 | buffer[offset] = 0x70; | |
895f3022 | 4514 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
4515 | /* ILLEGAL REQUEST */ |
4516 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; | |
4517 | /* INVALID COMMAND OPERATION CODE */ | |
4518 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20; | |
4519 | break; | |
4520 | case TCM_UNKNOWN_MODE_PAGE: | |
4521 | /* CURRENT ERROR */ | |
4522 | buffer[offset] = 0x70; | |
895f3022 | 4523 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
4524 | /* ILLEGAL REQUEST */ |
4525 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; | |
4526 | /* INVALID FIELD IN CDB */ | |
4527 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24; | |
4528 | break; | |
4529 | case TCM_CHECK_CONDITION_ABORT_CMD: | |
4530 | /* CURRENT ERROR */ | |
4531 | buffer[offset] = 0x70; | |
895f3022 | 4532 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
4533 | /* ABORTED COMMAND */ |
4534 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; | |
4535 | /* BUS DEVICE RESET FUNCTION OCCURRED */ | |
4536 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29; | |
4537 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03; | |
4538 | break; | |
4539 | case TCM_INCORRECT_AMOUNT_OF_DATA: | |
4540 | /* CURRENT ERROR */ | |
4541 | buffer[offset] = 0x70; | |
895f3022 | 4542 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
4543 | /* ABORTED COMMAND */ |
4544 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; | |
4545 | /* WRITE ERROR */ | |
4546 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c; | |
4547 | /* NOT ENOUGH UNSOLICITED DATA */ | |
4548 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d; | |
4549 | break; | |
4550 | case TCM_INVALID_CDB_FIELD: | |
4551 | /* CURRENT ERROR */ | |
4552 | buffer[offset] = 0x70; | |
895f3022 | 4553 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
9fbc8909 RD |
4554 | /* ILLEGAL REQUEST */ |
4555 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; | |
c66ac9db NB |
4556 | /* INVALID FIELD IN CDB */ |
4557 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24; | |
4558 | break; | |
4559 | case TCM_INVALID_PARAMETER_LIST: | |
4560 | /* CURRENT ERROR */ | |
4561 | buffer[offset] = 0x70; | |
895f3022 | 4562 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
9fbc8909 RD |
4563 | /* ILLEGAL REQUEST */ |
4564 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; | |
c66ac9db NB |
4565 | /* INVALID FIELD IN PARAMETER LIST */ |
4566 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26; | |
4567 | break; | |
4568 | case TCM_UNEXPECTED_UNSOLICITED_DATA: | |
4569 | /* CURRENT ERROR */ | |
4570 | buffer[offset] = 0x70; | |
895f3022 | 4571 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
4572 | /* ABORTED COMMAND */ |
4573 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; | |
4574 | /* WRITE ERROR */ | |
4575 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c; | |
4576 | /* UNEXPECTED_UNSOLICITED_DATA */ | |
4577 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c; | |
4578 | break; | |
4579 | case TCM_SERVICE_CRC_ERROR: | |
4580 | /* CURRENT ERROR */ | |
4581 | buffer[offset] = 0x70; | |
895f3022 | 4582 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
4583 | /* ABORTED COMMAND */ |
4584 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; | |
4585 | /* PROTOCOL SERVICE CRC ERROR */ | |
4586 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47; | |
4587 | /* N/A */ | |
4588 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05; | |
4589 | break; | |
4590 | case TCM_SNACK_REJECTED: | |
4591 | /* CURRENT ERROR */ | |
4592 | buffer[offset] = 0x70; | |
895f3022 | 4593 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
4594 | /* ABORTED COMMAND */ |
4595 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; | |
4596 | /* READ ERROR */ | |
4597 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11; | |
4598 | /* FAILED RETRANSMISSION REQUEST */ | |
4599 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13; | |
4600 | break; | |
4601 | case TCM_WRITE_PROTECTED: | |
4602 | /* CURRENT ERROR */ | |
4603 | buffer[offset] = 0x70; | |
895f3022 | 4604 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
4605 | /* DATA PROTECT */ |
4606 | buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT; | |
4607 | /* WRITE PROTECTED */ | |
4608 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27; | |
4609 | break; | |
4610 | case TCM_CHECK_CONDITION_UNIT_ATTENTION: | |
4611 | /* CURRENT ERROR */ | |
4612 | buffer[offset] = 0x70; | |
895f3022 | 4613 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
4614 | /* UNIT ATTENTION */ |
4615 | buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION; | |
4616 | core_scsi3_ua_for_check_condition(cmd, &asc, &ascq); | |
4617 | buffer[offset+SPC_ASC_KEY_OFFSET] = asc; | |
4618 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq; | |
4619 | break; | |
4620 | case TCM_CHECK_CONDITION_NOT_READY: | |
4621 | /* CURRENT ERROR */ | |
4622 | buffer[offset] = 0x70; | |
895f3022 | 4623 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
4624 | /* Not Ready */ |
4625 | buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY; | |
4626 | transport_get_sense_codes(cmd, &asc, &ascq); | |
4627 | buffer[offset+SPC_ASC_KEY_OFFSET] = asc; | |
4628 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq; | |
4629 | break; | |
4630 | case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE: | |
4631 | default: | |
4632 | /* CURRENT ERROR */ | |
4633 | buffer[offset] = 0x70; | |
895f3022 | 4634 | buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; |
c66ac9db NB |
4635 | /* ILLEGAL REQUEST */ |
4636 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; | |
4637 | /* LOGICAL UNIT COMMUNICATION FAILURE */ | |
4638 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80; | |
4639 | break; | |
4640 | } | |
4641 | /* | |
4642 | * This code uses linux/include/scsi/scsi.h SAM status codes! | |
4643 | */ | |
4644 | cmd->scsi_status = SAM_STAT_CHECK_CONDITION; | |
4645 | /* | |
4646 | * Automatically padded, this value is encoded in the fabric's | |
4647 | * data_length response PDU containing the SCSI defined sense data. | |
4648 | */ | |
4649 | cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset; | |
4650 | ||
4651 | after_reason: | |
07bde79a | 4652 | return cmd->se_tfo->queue_status(cmd); |
c66ac9db NB |
4653 | } |
4654 | EXPORT_SYMBOL(transport_send_check_condition_and_sense); | |
4655 | ||
4656 | int transport_check_aborted_status(struct se_cmd *cmd, int send_status) | |
4657 | { | |
4658 | int ret = 0; | |
4659 | ||
7d680f3b | 4660 | if (cmd->transport_state & CMD_T_ABORTED) { |
6708bb27 | 4661 | if (!send_status || |
c66ac9db NB |
4662 | (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS)) |
4663 | return 1; | |
4664 | #if 0 | |
6708bb27 | 4665 | pr_debug("Sending delayed SAM_STAT_TASK_ABORTED" |
c66ac9db | 4666 | " status for CDB: 0x%02x ITT: 0x%08x\n", |
a1d8b49a | 4667 | cmd->t_task_cdb[0], |
e3d6f909 | 4668 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db NB |
4669 | #endif |
4670 | cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS; | |
e3d6f909 | 4671 | cmd->se_tfo->queue_status(cmd); |
c66ac9db NB |
4672 | ret = 1; |
4673 | } | |
4674 | return ret; | |
4675 | } | |
4676 | EXPORT_SYMBOL(transport_check_aborted_status); | |
4677 | ||
4678 | void transport_send_task_abort(struct se_cmd *cmd) | |
4679 | { | |
c252f003 NB |
4680 | unsigned long flags; |
4681 | ||
4682 | spin_lock_irqsave(&cmd->t_state_lock, flags); | |
4683 | if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) { | |
4684 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
4685 | return; | |
4686 | } | |
4687 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
4688 | ||
c66ac9db NB |
4689 | /* |
4690 | * If there are still expected incoming fabric WRITEs, we wait | |
4691 | * until until they have completed before sending a TASK_ABORTED | |
4692 | * response. This response with TASK_ABORTED status will be | |
4693 | * queued back to fabric module by transport_check_aborted_status(). | |
4694 | */ | |
4695 | if (cmd->data_direction == DMA_TO_DEVICE) { | |
e3d6f909 | 4696 | if (cmd->se_tfo->write_pending_status(cmd) != 0) { |
7d680f3b | 4697 | cmd->transport_state |= CMD_T_ABORTED; |
c66ac9db | 4698 | smp_mb__after_atomic_inc(); |
c66ac9db NB |
4699 | } |
4700 | } | |
4701 | cmd->scsi_status = SAM_STAT_TASK_ABORTED; | |
4702 | #if 0 | |
6708bb27 | 4703 | pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x," |
a1d8b49a | 4704 | " ITT: 0x%08x\n", cmd->t_task_cdb[0], |
e3d6f909 | 4705 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 4706 | #endif |
e3d6f909 | 4707 | cmd->se_tfo->queue_status(cmd); |
c66ac9db NB |
4708 | } |
4709 | ||
e26d99ae | 4710 | static int transport_generic_do_tmr(struct se_cmd *cmd) |
c66ac9db | 4711 | { |
5951146d | 4712 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
4713 | struct se_tmr_req *tmr = cmd->se_tmr_req; |
4714 | int ret; | |
4715 | ||
4716 | switch (tmr->function) { | |
5c6cd613 | 4717 | case TMR_ABORT_TASK: |
3d28934a | 4718 | core_tmr_abort_task(dev, tmr, cmd->se_sess); |
c66ac9db | 4719 | break; |
5c6cd613 NB |
4720 | case TMR_ABORT_TASK_SET: |
4721 | case TMR_CLEAR_ACA: | |
4722 | case TMR_CLEAR_TASK_SET: | |
c66ac9db NB |
4723 | tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED; |
4724 | break; | |
5c6cd613 | 4725 | case TMR_LUN_RESET: |
c66ac9db NB |
4726 | ret = core_tmr_lun_reset(dev, tmr, NULL, NULL); |
4727 | tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE : | |
4728 | TMR_FUNCTION_REJECTED; | |
4729 | break; | |
5c6cd613 | 4730 | case TMR_TARGET_WARM_RESET: |
c66ac9db NB |
4731 | tmr->response = TMR_FUNCTION_REJECTED; |
4732 | break; | |
5c6cd613 | 4733 | case TMR_TARGET_COLD_RESET: |
c66ac9db NB |
4734 | tmr->response = TMR_FUNCTION_REJECTED; |
4735 | break; | |
c66ac9db | 4736 | default: |
6708bb27 | 4737 | pr_err("Uknown TMR function: 0x%02x.\n", |
c66ac9db NB |
4738 | tmr->function); |
4739 | tmr->response = TMR_FUNCTION_REJECTED; | |
4740 | break; | |
4741 | } | |
4742 | ||
4743 | cmd->t_state = TRANSPORT_ISTATE_PROCESSING; | |
e3d6f909 | 4744 | cmd->se_tfo->queue_tm_rsp(cmd); |
c66ac9db | 4745 | |
b7b8bef7 | 4746 | transport_cmd_check_stop_to_fabric(cmd); |
c66ac9db NB |
4747 | return 0; |
4748 | } | |
4749 | ||
c66ac9db NB |
4750 | /* transport_processing_thread(): |
4751 | * | |
4752 | * | |
4753 | */ | |
4754 | static int transport_processing_thread(void *param) | |
4755 | { | |
5951146d | 4756 | int ret; |
c66ac9db | 4757 | struct se_cmd *cmd; |
8359cf43 | 4758 | struct se_device *dev = param; |
c66ac9db | 4759 | |
c66ac9db | 4760 | while (!kthread_should_stop()) { |
e3d6f909 AG |
4761 | ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq, |
4762 | atomic_read(&dev->dev_queue_obj.queue_cnt) || | |
c66ac9db NB |
4763 | kthread_should_stop()); |
4764 | if (ret < 0) | |
4765 | goto out; | |
4766 | ||
c66ac9db | 4767 | get_cmd: |
5951146d AG |
4768 | cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj); |
4769 | if (!cmd) | |
c66ac9db NB |
4770 | continue; |
4771 | ||
5951146d | 4772 | switch (cmd->t_state) { |
680b73c5 CH |
4773 | case TRANSPORT_NEW_CMD: |
4774 | BUG(); | |
4775 | break; | |
c66ac9db | 4776 | case TRANSPORT_NEW_CMD_MAP: |
6708bb27 AG |
4777 | if (!cmd->se_tfo->new_cmd_map) { |
4778 | pr_err("cmd->se_tfo->new_cmd_map is" | |
c66ac9db NB |
4779 | " NULL for TRANSPORT_NEW_CMD_MAP\n"); |
4780 | BUG(); | |
4781 | } | |
e3d6f909 | 4782 | ret = cmd->se_tfo->new_cmd_map(cmd); |
c66ac9db | 4783 | if (ret < 0) { |
03e98c9e | 4784 | transport_generic_request_failure(cmd); |
c66ac9db NB |
4785 | break; |
4786 | } | |
c66ac9db | 4787 | ret = transport_generic_new_cmd(cmd); |
f147abb4 | 4788 | if (ret < 0) { |
03e98c9e NB |
4789 | transport_generic_request_failure(cmd); |
4790 | break; | |
c66ac9db NB |
4791 | } |
4792 | break; | |
4793 | case TRANSPORT_PROCESS_WRITE: | |
4794 | transport_generic_process_write(cmd); | |
4795 | break; | |
c66ac9db NB |
4796 | case TRANSPORT_PROCESS_TMR: |
4797 | transport_generic_do_tmr(cmd); | |
4798 | break; | |
07bde79a | 4799 | case TRANSPORT_COMPLETE_QF_WP: |
e057f533 CH |
4800 | transport_write_pending_qf(cmd); |
4801 | break; | |
4802 | case TRANSPORT_COMPLETE_QF_OK: | |
4803 | transport_complete_qf(cmd); | |
07bde79a | 4804 | break; |
c66ac9db | 4805 | default: |
f2da9dbd CH |
4806 | pr_err("Unknown t_state: %d for ITT: 0x%08x " |
4807 | "i_state: %d on SE LUN: %u\n", | |
4808 | cmd->t_state, | |
e3d6f909 AG |
4809 | cmd->se_tfo->get_task_tag(cmd), |
4810 | cmd->se_tfo->get_cmd_state(cmd), | |
4811 | cmd->se_lun->unpacked_lun); | |
c66ac9db NB |
4812 | BUG(); |
4813 | } | |
4814 | ||
4815 | goto get_cmd; | |
4816 | } | |
4817 | ||
4818 | out: | |
ce8762f6 NB |
4819 | WARN_ON(!list_empty(&dev->state_task_list)); |
4820 | WARN_ON(!list_empty(&dev->dev_queue_obj.qobj_list)); | |
c66ac9db NB |
4821 | dev->process_thread = NULL; |
4822 | return 0; | |
4823 | } |