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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> | |
39 | #include <asm/unaligned.h> | |
40 | #include <net/sock.h> | |
41 | #include <net/tcp.h> | |
42 | #include <scsi/scsi.h> | |
43 | #include <scsi/scsi_cmnd.h> | |
e66ecd50 | 44 | #include <scsi/scsi_tcq.h> |
c66ac9db NB |
45 | |
46 | #include <target/target_core_base.h> | |
47 | #include <target/target_core_device.h> | |
48 | #include <target/target_core_tmr.h> | |
49 | #include <target/target_core_tpg.h> | |
50 | #include <target/target_core_transport.h> | |
51 | #include <target/target_core_fabric_ops.h> | |
52 | #include <target/target_core_configfs.h> | |
53 | ||
54 | #include "target_core_alua.h" | |
55 | #include "target_core_hba.h" | |
56 | #include "target_core_pr.h" | |
c66ac9db NB |
57 | #include "target_core_ua.h" |
58 | ||
e3d6f909 | 59 | static int sub_api_initialized; |
c66ac9db NB |
60 | |
61 | static struct kmem_cache *se_cmd_cache; | |
62 | static struct kmem_cache *se_sess_cache; | |
63 | struct kmem_cache *se_tmr_req_cache; | |
64 | struct kmem_cache *se_ua_cache; | |
c66ac9db NB |
65 | struct kmem_cache *t10_pr_reg_cache; |
66 | struct kmem_cache *t10_alua_lu_gp_cache; | |
67 | struct kmem_cache *t10_alua_lu_gp_mem_cache; | |
68 | struct kmem_cache *t10_alua_tg_pt_gp_cache; | |
69 | struct kmem_cache *t10_alua_tg_pt_gp_mem_cache; | |
70 | ||
c66ac9db | 71 | static int transport_generic_write_pending(struct se_cmd *); |
5951146d | 72 | static int transport_processing_thread(void *param); |
c66ac9db NB |
73 | static int __transport_execute_tasks(struct se_device *dev); |
74 | static void transport_complete_task_attr(struct se_cmd *cmd); | |
07bde79a | 75 | static void transport_handle_queue_full(struct se_cmd *cmd, |
e057f533 | 76 | struct se_device *dev); |
c66ac9db NB |
77 | static void transport_direct_request_timeout(struct se_cmd *cmd); |
78 | static void transport_free_dev_tasks(struct se_cmd *cmd); | |
a1d8b49a | 79 | static u32 transport_allocate_tasks(struct se_cmd *cmd, |
ec98f782 | 80 | unsigned long long starting_lba, |
c66ac9db | 81 | enum dma_data_direction data_direction, |
ec98f782 | 82 | struct scatterlist *sgl, unsigned int nents); |
05d1c7c0 | 83 | static int transport_generic_get_mem(struct se_cmd *cmd); |
39c05f32 | 84 | static void transport_put_cmd(struct se_cmd *cmd); |
3df8d40b | 85 | static void transport_remove_cmd_from_queue(struct se_cmd *cmd); |
c66ac9db NB |
86 | static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq); |
87 | static void transport_stop_all_task_timers(struct se_cmd *cmd); | |
88 | ||
e3d6f909 | 89 | int init_se_kmem_caches(void) |
c66ac9db | 90 | { |
c66ac9db NB |
91 | se_cmd_cache = kmem_cache_create("se_cmd_cache", |
92 | sizeof(struct se_cmd), __alignof__(struct se_cmd), 0, NULL); | |
6708bb27 AG |
93 | if (!se_cmd_cache) { |
94 | pr_err("kmem_cache_create for struct se_cmd failed\n"); | |
c66ac9db NB |
95 | goto out; |
96 | } | |
97 | se_tmr_req_cache = kmem_cache_create("se_tmr_cache", | |
98 | sizeof(struct se_tmr_req), __alignof__(struct se_tmr_req), | |
99 | 0, NULL); | |
6708bb27 AG |
100 | if (!se_tmr_req_cache) { |
101 | pr_err("kmem_cache_create() for struct se_tmr_req" | |
c66ac9db NB |
102 | " failed\n"); |
103 | goto out; | |
104 | } | |
105 | se_sess_cache = kmem_cache_create("se_sess_cache", | |
106 | sizeof(struct se_session), __alignof__(struct se_session), | |
107 | 0, NULL); | |
6708bb27 AG |
108 | if (!se_sess_cache) { |
109 | pr_err("kmem_cache_create() for struct se_session" | |
c66ac9db NB |
110 | " failed\n"); |
111 | goto out; | |
112 | } | |
113 | se_ua_cache = kmem_cache_create("se_ua_cache", | |
114 | sizeof(struct se_ua), __alignof__(struct se_ua), | |
115 | 0, NULL); | |
6708bb27 AG |
116 | if (!se_ua_cache) { |
117 | pr_err("kmem_cache_create() for struct se_ua failed\n"); | |
c66ac9db NB |
118 | goto out; |
119 | } | |
c66ac9db NB |
120 | t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache", |
121 | sizeof(struct t10_pr_registration), | |
122 | __alignof__(struct t10_pr_registration), 0, NULL); | |
6708bb27 AG |
123 | if (!t10_pr_reg_cache) { |
124 | pr_err("kmem_cache_create() for struct t10_pr_registration" | |
c66ac9db NB |
125 | " failed\n"); |
126 | goto out; | |
127 | } | |
128 | t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache", | |
129 | sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp), | |
130 | 0, NULL); | |
6708bb27 AG |
131 | if (!t10_alua_lu_gp_cache) { |
132 | pr_err("kmem_cache_create() for t10_alua_lu_gp_cache" | |
c66ac9db NB |
133 | " failed\n"); |
134 | goto out; | |
135 | } | |
136 | t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache", | |
137 | sizeof(struct t10_alua_lu_gp_member), | |
138 | __alignof__(struct t10_alua_lu_gp_member), 0, NULL); | |
6708bb27 AG |
139 | if (!t10_alua_lu_gp_mem_cache) { |
140 | pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_" | |
c66ac9db NB |
141 | "cache failed\n"); |
142 | goto out; | |
143 | } | |
144 | t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache", | |
145 | sizeof(struct t10_alua_tg_pt_gp), | |
146 | __alignof__(struct t10_alua_tg_pt_gp), 0, NULL); | |
6708bb27 AG |
147 | if (!t10_alua_tg_pt_gp_cache) { |
148 | pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_" | |
c66ac9db NB |
149 | "cache failed\n"); |
150 | goto out; | |
151 | } | |
152 | t10_alua_tg_pt_gp_mem_cache = kmem_cache_create( | |
153 | "t10_alua_tg_pt_gp_mem_cache", | |
154 | sizeof(struct t10_alua_tg_pt_gp_member), | |
155 | __alignof__(struct t10_alua_tg_pt_gp_member), | |
156 | 0, NULL); | |
6708bb27 AG |
157 | if (!t10_alua_tg_pt_gp_mem_cache) { |
158 | pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_" | |
c66ac9db NB |
159 | "mem_t failed\n"); |
160 | goto out; | |
161 | } | |
162 | ||
c66ac9db NB |
163 | return 0; |
164 | out: | |
165 | if (se_cmd_cache) | |
166 | kmem_cache_destroy(se_cmd_cache); | |
167 | if (se_tmr_req_cache) | |
168 | kmem_cache_destroy(se_tmr_req_cache); | |
169 | if (se_sess_cache) | |
170 | kmem_cache_destroy(se_sess_cache); | |
171 | if (se_ua_cache) | |
172 | kmem_cache_destroy(se_ua_cache); | |
c66ac9db NB |
173 | if (t10_pr_reg_cache) |
174 | kmem_cache_destroy(t10_pr_reg_cache); | |
175 | if (t10_alua_lu_gp_cache) | |
176 | kmem_cache_destroy(t10_alua_lu_gp_cache); | |
177 | if (t10_alua_lu_gp_mem_cache) | |
178 | kmem_cache_destroy(t10_alua_lu_gp_mem_cache); | |
179 | if (t10_alua_tg_pt_gp_cache) | |
180 | kmem_cache_destroy(t10_alua_tg_pt_gp_cache); | |
181 | if (t10_alua_tg_pt_gp_mem_cache) | |
182 | kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache); | |
e3d6f909 | 183 | return -ENOMEM; |
c66ac9db NB |
184 | } |
185 | ||
e3d6f909 | 186 | void release_se_kmem_caches(void) |
c66ac9db | 187 | { |
c66ac9db NB |
188 | kmem_cache_destroy(se_cmd_cache); |
189 | kmem_cache_destroy(se_tmr_req_cache); | |
190 | kmem_cache_destroy(se_sess_cache); | |
191 | kmem_cache_destroy(se_ua_cache); | |
c66ac9db NB |
192 | kmem_cache_destroy(t10_pr_reg_cache); |
193 | kmem_cache_destroy(t10_alua_lu_gp_cache); | |
194 | kmem_cache_destroy(t10_alua_lu_gp_mem_cache); | |
195 | kmem_cache_destroy(t10_alua_tg_pt_gp_cache); | |
196 | kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache); | |
c66ac9db NB |
197 | } |
198 | ||
e3d6f909 AG |
199 | /* This code ensures unique mib indexes are handed out. */ |
200 | static DEFINE_SPINLOCK(scsi_mib_index_lock); | |
201 | static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX]; | |
e89d15ee NB |
202 | |
203 | /* | |
204 | * Allocate a new row index for the entry type specified | |
205 | */ | |
206 | u32 scsi_get_new_index(scsi_index_t type) | |
207 | { | |
208 | u32 new_index; | |
209 | ||
e3d6f909 | 210 | BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX)); |
e89d15ee | 211 | |
e3d6f909 AG |
212 | spin_lock(&scsi_mib_index_lock); |
213 | new_index = ++scsi_mib_index[type]; | |
214 | spin_unlock(&scsi_mib_index_lock); | |
e89d15ee NB |
215 | |
216 | return new_index; | |
217 | } | |
218 | ||
c66ac9db NB |
219 | void transport_init_queue_obj(struct se_queue_obj *qobj) |
220 | { | |
221 | atomic_set(&qobj->queue_cnt, 0); | |
222 | INIT_LIST_HEAD(&qobj->qobj_list); | |
223 | init_waitqueue_head(&qobj->thread_wq); | |
224 | spin_lock_init(&qobj->cmd_queue_lock); | |
225 | } | |
226 | EXPORT_SYMBOL(transport_init_queue_obj); | |
227 | ||
228 | static int transport_subsystem_reqmods(void) | |
229 | { | |
230 | int ret; | |
231 | ||
232 | ret = request_module("target_core_iblock"); | |
233 | if (ret != 0) | |
6708bb27 | 234 | pr_err("Unable to load target_core_iblock\n"); |
c66ac9db NB |
235 | |
236 | ret = request_module("target_core_file"); | |
237 | if (ret != 0) | |
6708bb27 | 238 | pr_err("Unable to load target_core_file\n"); |
c66ac9db NB |
239 | |
240 | ret = request_module("target_core_pscsi"); | |
241 | if (ret != 0) | |
6708bb27 | 242 | pr_err("Unable to load target_core_pscsi\n"); |
c66ac9db NB |
243 | |
244 | ret = request_module("target_core_stgt"); | |
245 | if (ret != 0) | |
6708bb27 | 246 | pr_err("Unable to load target_core_stgt\n"); |
c66ac9db NB |
247 | |
248 | return 0; | |
249 | } | |
250 | ||
251 | int transport_subsystem_check_init(void) | |
252 | { | |
e3d6f909 AG |
253 | int ret; |
254 | ||
255 | if (sub_api_initialized) | |
c66ac9db NB |
256 | return 0; |
257 | /* | |
258 | * Request the loading of known TCM subsystem plugins.. | |
259 | */ | |
e3d6f909 AG |
260 | ret = transport_subsystem_reqmods(); |
261 | if (ret < 0) | |
262 | return ret; | |
c66ac9db | 263 | |
e3d6f909 | 264 | sub_api_initialized = 1; |
c66ac9db NB |
265 | return 0; |
266 | } | |
267 | ||
268 | struct se_session *transport_init_session(void) | |
269 | { | |
270 | struct se_session *se_sess; | |
271 | ||
272 | se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL); | |
6708bb27 AG |
273 | if (!se_sess) { |
274 | pr_err("Unable to allocate struct se_session from" | |
c66ac9db NB |
275 | " se_sess_cache\n"); |
276 | return ERR_PTR(-ENOMEM); | |
277 | } | |
278 | INIT_LIST_HEAD(&se_sess->sess_list); | |
279 | INIT_LIST_HEAD(&se_sess->sess_acl_list); | |
c66ac9db NB |
280 | |
281 | return se_sess; | |
282 | } | |
283 | EXPORT_SYMBOL(transport_init_session); | |
284 | ||
285 | /* | |
286 | * Called with spin_lock_bh(&struct se_portal_group->session_lock called. | |
287 | */ | |
288 | void __transport_register_session( | |
289 | struct se_portal_group *se_tpg, | |
290 | struct se_node_acl *se_nacl, | |
291 | struct se_session *se_sess, | |
292 | void *fabric_sess_ptr) | |
293 | { | |
294 | unsigned char buf[PR_REG_ISID_LEN]; | |
295 | ||
296 | se_sess->se_tpg = se_tpg; | |
297 | se_sess->fabric_sess_ptr = fabric_sess_ptr; | |
298 | /* | |
299 | * Used by struct se_node_acl's under ConfigFS to locate active se_session-t | |
300 | * | |
301 | * Only set for struct se_session's that will actually be moving I/O. | |
302 | * eg: *NOT* discovery sessions. | |
303 | */ | |
304 | if (se_nacl) { | |
305 | /* | |
306 | * If the fabric module supports an ISID based TransportID, | |
307 | * save this value in binary from the fabric I_T Nexus now. | |
308 | */ | |
e3d6f909 | 309 | if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { |
c66ac9db | 310 | memset(&buf[0], 0, PR_REG_ISID_LEN); |
e3d6f909 | 311 | se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, |
c66ac9db NB |
312 | &buf[0], PR_REG_ISID_LEN); |
313 | se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]); | |
314 | } | |
315 | spin_lock_irq(&se_nacl->nacl_sess_lock); | |
316 | /* | |
317 | * The se_nacl->nacl_sess pointer will be set to the | |
318 | * last active I_T Nexus for each struct se_node_acl. | |
319 | */ | |
320 | se_nacl->nacl_sess = se_sess; | |
321 | ||
322 | list_add_tail(&se_sess->sess_acl_list, | |
323 | &se_nacl->acl_sess_list); | |
324 | spin_unlock_irq(&se_nacl->nacl_sess_lock); | |
325 | } | |
326 | list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list); | |
327 | ||
6708bb27 | 328 | pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n", |
e3d6f909 | 329 | se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr); |
c66ac9db NB |
330 | } |
331 | EXPORT_SYMBOL(__transport_register_session); | |
332 | ||
333 | void transport_register_session( | |
334 | struct se_portal_group *se_tpg, | |
335 | struct se_node_acl *se_nacl, | |
336 | struct se_session *se_sess, | |
337 | void *fabric_sess_ptr) | |
338 | { | |
339 | spin_lock_bh(&se_tpg->session_lock); | |
340 | __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr); | |
341 | spin_unlock_bh(&se_tpg->session_lock); | |
342 | } | |
343 | EXPORT_SYMBOL(transport_register_session); | |
344 | ||
345 | void transport_deregister_session_configfs(struct se_session *se_sess) | |
346 | { | |
347 | struct se_node_acl *se_nacl; | |
23388864 | 348 | unsigned long flags; |
c66ac9db NB |
349 | /* |
350 | * Used by struct se_node_acl's under ConfigFS to locate active struct se_session | |
351 | */ | |
352 | se_nacl = se_sess->se_node_acl; | |
6708bb27 | 353 | if (se_nacl) { |
23388864 | 354 | spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags); |
c66ac9db NB |
355 | list_del(&se_sess->sess_acl_list); |
356 | /* | |
357 | * If the session list is empty, then clear the pointer. | |
358 | * Otherwise, set the struct se_session pointer from the tail | |
359 | * element of the per struct se_node_acl active session list. | |
360 | */ | |
361 | if (list_empty(&se_nacl->acl_sess_list)) | |
362 | se_nacl->nacl_sess = NULL; | |
363 | else { | |
364 | se_nacl->nacl_sess = container_of( | |
365 | se_nacl->acl_sess_list.prev, | |
366 | struct se_session, sess_acl_list); | |
367 | } | |
23388864 | 368 | spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags); |
c66ac9db NB |
369 | } |
370 | } | |
371 | EXPORT_SYMBOL(transport_deregister_session_configfs); | |
372 | ||
373 | void transport_free_session(struct se_session *se_sess) | |
374 | { | |
375 | kmem_cache_free(se_sess_cache, se_sess); | |
376 | } | |
377 | EXPORT_SYMBOL(transport_free_session); | |
378 | ||
379 | void transport_deregister_session(struct se_session *se_sess) | |
380 | { | |
381 | struct se_portal_group *se_tpg = se_sess->se_tpg; | |
382 | struct se_node_acl *se_nacl; | |
e63a8e19 | 383 | unsigned long flags; |
c66ac9db | 384 | |
6708bb27 | 385 | if (!se_tpg) { |
c66ac9db NB |
386 | transport_free_session(se_sess); |
387 | return; | |
388 | } | |
c66ac9db | 389 | |
e63a8e19 | 390 | spin_lock_irqsave(&se_tpg->session_lock, flags); |
c66ac9db NB |
391 | list_del(&se_sess->sess_list); |
392 | se_sess->se_tpg = NULL; | |
393 | se_sess->fabric_sess_ptr = NULL; | |
e63a8e19 | 394 | spin_unlock_irqrestore(&se_tpg->session_lock, flags); |
c66ac9db NB |
395 | |
396 | /* | |
397 | * Determine if we need to do extra work for this initiator node's | |
398 | * struct se_node_acl if it had been previously dynamically generated. | |
399 | */ | |
400 | se_nacl = se_sess->se_node_acl; | |
6708bb27 | 401 | if (se_nacl) { |
e63a8e19 | 402 | spin_lock_irqsave(&se_tpg->acl_node_lock, flags); |
c66ac9db | 403 | if (se_nacl->dynamic_node_acl) { |
6708bb27 AG |
404 | if (!se_tpg->se_tpg_tfo->tpg_check_demo_mode_cache( |
405 | se_tpg)) { | |
c66ac9db NB |
406 | list_del(&se_nacl->acl_list); |
407 | se_tpg->num_node_acls--; | |
e63a8e19 | 408 | spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags); |
c66ac9db NB |
409 | |
410 | core_tpg_wait_for_nacl_pr_ref(se_nacl); | |
c66ac9db | 411 | core_free_device_list_for_node(se_nacl, se_tpg); |
e3d6f909 | 412 | se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg, |
c66ac9db | 413 | se_nacl); |
e63a8e19 | 414 | spin_lock_irqsave(&se_tpg->acl_node_lock, flags); |
c66ac9db NB |
415 | } |
416 | } | |
e63a8e19 | 417 | spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags); |
c66ac9db NB |
418 | } |
419 | ||
420 | transport_free_session(se_sess); | |
421 | ||
6708bb27 | 422 | pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n", |
e3d6f909 | 423 | se_tpg->se_tpg_tfo->get_fabric_name()); |
c66ac9db NB |
424 | } |
425 | EXPORT_SYMBOL(transport_deregister_session); | |
426 | ||
427 | /* | |
a1d8b49a | 428 | * Called with cmd->t_state_lock held. |
c66ac9db NB |
429 | */ |
430 | static void transport_all_task_dev_remove_state(struct se_cmd *cmd) | |
431 | { | |
42bf829e | 432 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
433 | struct se_task *task; |
434 | unsigned long flags; | |
435 | ||
42bf829e CH |
436 | if (!dev) |
437 | return; | |
c66ac9db | 438 | |
42bf829e | 439 | list_for_each_entry(task, &cmd->t_task_list, t_list) { |
6c76bf95 | 440 | if (task->task_flags & TF_ACTIVE) |
c66ac9db NB |
441 | continue; |
442 | ||
6708bb27 | 443 | if (!atomic_read(&task->task_state_active)) |
c66ac9db NB |
444 | continue; |
445 | ||
446 | spin_lock_irqsave(&dev->execute_task_lock, flags); | |
447 | list_del(&task->t_state_list); | |
6708bb27 AG |
448 | pr_debug("Removed ITT: 0x%08x dev: %p task[%p]\n", |
449 | cmd->se_tfo->get_task_tag(cmd), dev, task); | |
c66ac9db NB |
450 | spin_unlock_irqrestore(&dev->execute_task_lock, flags); |
451 | ||
452 | atomic_set(&task->task_state_active, 0); | |
a1d8b49a | 453 | atomic_dec(&cmd->t_task_cdbs_ex_left); |
c66ac9db NB |
454 | } |
455 | } | |
456 | ||
457 | /* transport_cmd_check_stop(): | |
458 | * | |
459 | * 'transport_off = 1' determines if t_transport_active should be cleared. | |
460 | * 'transport_off = 2' determines if task_dev_state should be removed. | |
461 | * | |
462 | * A non-zero u8 t_state sets cmd->t_state. | |
463 | * Returns 1 when command is stopped, else 0. | |
464 | */ | |
465 | static int transport_cmd_check_stop( | |
466 | struct se_cmd *cmd, | |
467 | int transport_off, | |
468 | u8 t_state) | |
469 | { | |
470 | unsigned long flags; | |
471 | ||
a1d8b49a | 472 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db NB |
473 | /* |
474 | * Determine if IOCTL context caller in requesting the stopping of this | |
475 | * command for LUN shutdown purposes. | |
476 | */ | |
a1d8b49a | 477 | if (atomic_read(&cmd->transport_lun_stop)) { |
6708bb27 | 478 | pr_debug("%s:%d atomic_read(&cmd->transport_lun_stop)" |
c66ac9db | 479 | " == TRUE for ITT: 0x%08x\n", __func__, __LINE__, |
e3d6f909 | 480 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db NB |
481 | |
482 | cmd->deferred_t_state = cmd->t_state; | |
483 | cmd->t_state = TRANSPORT_DEFERRED_CMD; | |
a1d8b49a | 484 | atomic_set(&cmd->t_transport_active, 0); |
c66ac9db NB |
485 | if (transport_off == 2) |
486 | transport_all_task_dev_remove_state(cmd); | |
a1d8b49a | 487 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 488 | |
a1d8b49a | 489 | complete(&cmd->transport_lun_stop_comp); |
c66ac9db NB |
490 | return 1; |
491 | } | |
492 | /* | |
493 | * Determine if frontend context caller is requesting the stopping of | |
e3d6f909 | 494 | * this command for frontend exceptions. |
c66ac9db | 495 | */ |
a1d8b49a | 496 | if (atomic_read(&cmd->t_transport_stop)) { |
6708bb27 | 497 | pr_debug("%s:%d atomic_read(&cmd->t_transport_stop) ==" |
c66ac9db | 498 | " TRUE for ITT: 0x%08x\n", __func__, __LINE__, |
e3d6f909 | 499 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db NB |
500 | |
501 | cmd->deferred_t_state = cmd->t_state; | |
502 | cmd->t_state = TRANSPORT_DEFERRED_CMD; | |
503 | if (transport_off == 2) | |
504 | transport_all_task_dev_remove_state(cmd); | |
505 | ||
506 | /* | |
507 | * Clear struct se_cmd->se_lun before the transport_off == 2 handoff | |
508 | * to FE. | |
509 | */ | |
510 | if (transport_off == 2) | |
511 | cmd->se_lun = NULL; | |
a1d8b49a | 512 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 513 | |
a1d8b49a | 514 | complete(&cmd->t_transport_stop_comp); |
c66ac9db NB |
515 | return 1; |
516 | } | |
517 | if (transport_off) { | |
a1d8b49a | 518 | atomic_set(&cmd->t_transport_active, 0); |
c66ac9db NB |
519 | if (transport_off == 2) { |
520 | transport_all_task_dev_remove_state(cmd); | |
521 | /* | |
522 | * Clear struct se_cmd->se_lun before the transport_off == 2 | |
523 | * handoff to fabric module. | |
524 | */ | |
525 | cmd->se_lun = NULL; | |
526 | /* | |
527 | * Some fabric modules like tcm_loop can release | |
25985edc | 528 | * their internally allocated I/O reference now and |
c66ac9db NB |
529 | * struct se_cmd now. |
530 | */ | |
e3d6f909 | 531 | if (cmd->se_tfo->check_stop_free != NULL) { |
c66ac9db | 532 | spin_unlock_irqrestore( |
a1d8b49a | 533 | &cmd->t_state_lock, flags); |
c66ac9db | 534 | |
e3d6f909 | 535 | cmd->se_tfo->check_stop_free(cmd); |
c66ac9db NB |
536 | return 1; |
537 | } | |
538 | } | |
a1d8b49a | 539 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
540 | |
541 | return 0; | |
542 | } else if (t_state) | |
543 | cmd->t_state = t_state; | |
a1d8b49a | 544 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
545 | |
546 | return 0; | |
547 | } | |
548 | ||
549 | static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd) | |
550 | { | |
551 | return transport_cmd_check_stop(cmd, 2, 0); | |
552 | } | |
553 | ||
554 | static void transport_lun_remove_cmd(struct se_cmd *cmd) | |
555 | { | |
e3d6f909 | 556 | struct se_lun *lun = cmd->se_lun; |
c66ac9db NB |
557 | unsigned long flags; |
558 | ||
559 | if (!lun) | |
560 | return; | |
561 | ||
a1d8b49a | 562 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
6708bb27 | 563 | if (!atomic_read(&cmd->transport_dev_active)) { |
a1d8b49a | 564 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
565 | goto check_lun; |
566 | } | |
a1d8b49a | 567 | atomic_set(&cmd->transport_dev_active, 0); |
c66ac9db | 568 | transport_all_task_dev_remove_state(cmd); |
a1d8b49a | 569 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 570 | |
c66ac9db NB |
571 | |
572 | check_lun: | |
573 | spin_lock_irqsave(&lun->lun_cmd_lock, flags); | |
a1d8b49a | 574 | if (atomic_read(&cmd->transport_lun_active)) { |
5951146d | 575 | list_del(&cmd->se_lun_node); |
a1d8b49a | 576 | atomic_set(&cmd->transport_lun_active, 0); |
c66ac9db | 577 | #if 0 |
6708bb27 | 578 | pr_debug("Removed ITT: 0x%08x from LUN LIST[%d]\n" |
e3d6f909 | 579 | cmd->se_tfo->get_task_tag(cmd), lun->unpacked_lun); |
c66ac9db NB |
580 | #endif |
581 | } | |
582 | spin_unlock_irqrestore(&lun->lun_cmd_lock, flags); | |
583 | } | |
584 | ||
585 | void transport_cmd_finish_abort(struct se_cmd *cmd, int remove) | |
586 | { | |
8dc52b54 NB |
587 | if (!cmd->se_tmr_req) |
588 | transport_lun_remove_cmd(cmd); | |
c66ac9db NB |
589 | |
590 | if (transport_cmd_check_stop_to_fabric(cmd)) | |
591 | return; | |
77039d1e | 592 | if (remove) { |
3df8d40b | 593 | transport_remove_cmd_from_queue(cmd); |
e6a2573f | 594 | transport_put_cmd(cmd); |
77039d1e | 595 | } |
c66ac9db NB |
596 | } |
597 | ||
f7a5cc0b CH |
598 | static void transport_add_cmd_to_queue(struct se_cmd *cmd, int t_state, |
599 | bool at_head) | |
c66ac9db NB |
600 | { |
601 | struct se_device *dev = cmd->se_dev; | |
e3d6f909 | 602 | struct se_queue_obj *qobj = &dev->dev_queue_obj; |
c66ac9db NB |
603 | unsigned long flags; |
604 | ||
c66ac9db | 605 | if (t_state) { |
a1d8b49a | 606 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 607 | cmd->t_state = t_state; |
a1d8b49a AG |
608 | atomic_set(&cmd->t_transport_active, 1); |
609 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
c66ac9db NB |
610 | } |
611 | ||
612 | spin_lock_irqsave(&qobj->cmd_queue_lock, flags); | |
79a7fef2 RD |
613 | |
614 | /* If the cmd is already on the list, remove it before we add it */ | |
615 | if (!list_empty(&cmd->se_queue_node)) | |
616 | list_del(&cmd->se_queue_node); | |
617 | else | |
618 | atomic_inc(&qobj->queue_cnt); | |
619 | ||
f7a5cc0b | 620 | if (at_head) |
07bde79a | 621 | list_add(&cmd->se_queue_node, &qobj->qobj_list); |
f7a5cc0b | 622 | else |
07bde79a | 623 | list_add_tail(&cmd->se_queue_node, &qobj->qobj_list); |
79a7fef2 | 624 | atomic_set(&cmd->t_transport_queue_active, 1); |
c66ac9db NB |
625 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); |
626 | ||
c66ac9db | 627 | wake_up_interruptible(&qobj->thread_wq); |
c66ac9db NB |
628 | } |
629 | ||
5951146d AG |
630 | static struct se_cmd * |
631 | transport_get_cmd_from_queue(struct se_queue_obj *qobj) | |
c66ac9db | 632 | { |
5951146d | 633 | struct se_cmd *cmd; |
c66ac9db NB |
634 | unsigned long flags; |
635 | ||
636 | spin_lock_irqsave(&qobj->cmd_queue_lock, flags); | |
637 | if (list_empty(&qobj->qobj_list)) { | |
638 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); | |
639 | return NULL; | |
640 | } | |
5951146d | 641 | cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node); |
c66ac9db | 642 | |
79a7fef2 | 643 | atomic_set(&cmd->t_transport_queue_active, 0); |
c66ac9db | 644 | |
79a7fef2 | 645 | list_del_init(&cmd->se_queue_node); |
c66ac9db NB |
646 | atomic_dec(&qobj->queue_cnt); |
647 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); | |
648 | ||
5951146d | 649 | return cmd; |
c66ac9db NB |
650 | } |
651 | ||
3df8d40b | 652 | static void transport_remove_cmd_from_queue(struct se_cmd *cmd) |
c66ac9db | 653 | { |
3df8d40b | 654 | struct se_queue_obj *qobj = &cmd->se_dev->dev_queue_obj; |
c66ac9db NB |
655 | unsigned long flags; |
656 | ||
657 | spin_lock_irqsave(&qobj->cmd_queue_lock, flags); | |
6708bb27 | 658 | if (!atomic_read(&cmd->t_transport_queue_active)) { |
c66ac9db NB |
659 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); |
660 | return; | |
661 | } | |
79a7fef2 RD |
662 | atomic_set(&cmd->t_transport_queue_active, 0); |
663 | atomic_dec(&qobj->queue_cnt); | |
664 | list_del_init(&cmd->se_queue_node); | |
c66ac9db NB |
665 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); |
666 | ||
a1d8b49a | 667 | if (atomic_read(&cmd->t_transport_queue_active)) { |
6708bb27 | 668 | pr_err("ITT: 0x%08x t_transport_queue_active: %d\n", |
e3d6f909 | 669 | cmd->se_tfo->get_task_tag(cmd), |
a1d8b49a | 670 | atomic_read(&cmd->t_transport_queue_active)); |
c66ac9db NB |
671 | } |
672 | } | |
673 | ||
674 | /* | |
675 | * Completion function used by TCM subsystem plugins (such as FILEIO) | |
676 | * for queueing up response from struct se_subsystem_api->do_task() | |
677 | */ | |
678 | void transport_complete_sync_cache(struct se_cmd *cmd, int good) | |
679 | { | |
a1d8b49a | 680 | struct se_task *task = list_entry(cmd->t_task_list.next, |
c66ac9db NB |
681 | struct se_task, t_list); |
682 | ||
683 | if (good) { | |
684 | cmd->scsi_status = SAM_STAT_GOOD; | |
685 | task->task_scsi_status = GOOD; | |
686 | } else { | |
687 | task->task_scsi_status = SAM_STAT_CHECK_CONDITION; | |
688 | task->task_error_status = PYX_TRANSPORT_ILLEGAL_REQUEST; | |
e3d6f909 | 689 | task->task_se_cmd->transport_error_status = |
c66ac9db NB |
690 | PYX_TRANSPORT_ILLEGAL_REQUEST; |
691 | } | |
692 | ||
693 | transport_complete_task(task, good); | |
694 | } | |
695 | EXPORT_SYMBOL(transport_complete_sync_cache); | |
696 | ||
697 | /* transport_complete_task(): | |
698 | * | |
699 | * Called from interrupt and non interrupt context depending | |
700 | * on the transport plugin. | |
701 | */ | |
702 | void transport_complete_task(struct se_task *task, int success) | |
703 | { | |
e3d6f909 | 704 | struct se_cmd *cmd = task->task_se_cmd; |
42bf829e | 705 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
706 | int t_state; |
707 | unsigned long flags; | |
708 | #if 0 | |
6708bb27 | 709 | pr_debug("task: %p CDB: 0x%02x obj_ptr: %p\n", task, |
a1d8b49a | 710 | cmd->t_task_cdb[0], dev); |
c66ac9db | 711 | #endif |
e3d6f909 | 712 | if (dev) |
c66ac9db | 713 | atomic_inc(&dev->depth_left); |
c66ac9db | 714 | |
a1d8b49a | 715 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
6c76bf95 | 716 | task->task_flags &= ~TF_ACTIVE; |
c66ac9db NB |
717 | |
718 | /* | |
719 | * See if any sense data exists, if so set the TASK_SENSE flag. | |
720 | * Also check for any other post completion work that needs to be | |
721 | * done by the plugins. | |
722 | */ | |
723 | if (dev && dev->transport->transport_complete) { | |
724 | if (dev->transport->transport_complete(task) != 0) { | |
725 | cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE; | |
726 | task->task_sense = 1; | |
727 | success = 1; | |
728 | } | |
729 | } | |
730 | ||
731 | /* | |
732 | * See if we are waiting for outstanding struct se_task | |
733 | * to complete for an exception condition | |
734 | */ | |
6c76bf95 | 735 | if (task->task_flags & TF_REQUEST_STOP) { |
c66ac9db | 736 | /* |
a1d8b49a | 737 | * Decrement cmd->t_se_count if this task had |
c66ac9db NB |
738 | * previously thrown its timeout exception handler. |
739 | */ | |
6c76bf95 | 740 | if (task->task_flags & TF_TIMEOUT) { |
a1d8b49a | 741 | atomic_dec(&cmd->t_se_count); |
6c76bf95 | 742 | task->task_flags &= ~TF_TIMEOUT; |
c66ac9db | 743 | } |
a1d8b49a | 744 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
745 | |
746 | complete(&task->task_stop_comp); | |
747 | return; | |
748 | } | |
749 | /* | |
750 | * If the task's timeout handler has fired, use the t_task_cdbs_timeout | |
751 | * left counter to determine when the struct se_cmd is ready to be queued to | |
752 | * the processing thread. | |
753 | */ | |
6c76bf95 | 754 | if (task->task_flags & TF_TIMEOUT) { |
6708bb27 AG |
755 | if (!atomic_dec_and_test( |
756 | &cmd->t_task_cdbs_timeout_left)) { | |
a1d8b49a | 757 | spin_unlock_irqrestore(&cmd->t_state_lock, |
c66ac9db NB |
758 | flags); |
759 | return; | |
760 | } | |
761 | t_state = TRANSPORT_COMPLETE_TIMEOUT; | |
a1d8b49a | 762 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 763 | |
f7a5cc0b | 764 | transport_add_cmd_to_queue(cmd, t_state, false); |
c66ac9db NB |
765 | return; |
766 | } | |
a1d8b49a | 767 | atomic_dec(&cmd->t_task_cdbs_timeout_left); |
c66ac9db NB |
768 | |
769 | /* | |
770 | * Decrement the outstanding t_task_cdbs_left count. The last | |
771 | * struct se_task from struct se_cmd will complete itself into the | |
772 | * device queue depending upon int success. | |
773 | */ | |
6708bb27 | 774 | if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) { |
c66ac9db | 775 | if (!success) |
a1d8b49a | 776 | cmd->t_tasks_failed = 1; |
c66ac9db | 777 | |
a1d8b49a | 778 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
779 | return; |
780 | } | |
781 | ||
a1d8b49a | 782 | if (!success || cmd->t_tasks_failed) { |
c66ac9db NB |
783 | t_state = TRANSPORT_COMPLETE_FAILURE; |
784 | if (!task->task_error_status) { | |
785 | task->task_error_status = | |
786 | PYX_TRANSPORT_UNKNOWN_SAM_OPCODE; | |
787 | cmd->transport_error_status = | |
788 | PYX_TRANSPORT_UNKNOWN_SAM_OPCODE; | |
789 | } | |
790 | } else { | |
a1d8b49a | 791 | atomic_set(&cmd->t_transport_complete, 1); |
c66ac9db NB |
792 | t_state = TRANSPORT_COMPLETE_OK; |
793 | } | |
a1d8b49a | 794 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 795 | |
f7a5cc0b | 796 | transport_add_cmd_to_queue(cmd, t_state, false); |
c66ac9db NB |
797 | } |
798 | EXPORT_SYMBOL(transport_complete_task); | |
799 | ||
800 | /* | |
801 | * Called by transport_add_tasks_from_cmd() once a struct se_cmd's | |
802 | * struct se_task list are ready to be added to the active execution list | |
803 | * struct se_device | |
804 | ||
805 | * Called with se_dev_t->execute_task_lock called. | |
806 | */ | |
807 | static inline int transport_add_task_check_sam_attr( | |
808 | struct se_task *task, | |
809 | struct se_task *task_prev, | |
810 | struct se_device *dev) | |
811 | { | |
812 | /* | |
813 | * No SAM Task attribute emulation enabled, add to tail of | |
814 | * execution queue | |
815 | */ | |
816 | if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) { | |
817 | list_add_tail(&task->t_execute_list, &dev->execute_task_list); | |
818 | return 0; | |
819 | } | |
820 | /* | |
821 | * HEAD_OF_QUEUE attribute for received CDB, which means | |
822 | * the first task that is associated with a struct se_cmd goes to | |
823 | * head of the struct se_device->execute_task_list, and task_prev | |
824 | * after that for each subsequent task | |
825 | */ | |
e66ecd50 | 826 | if (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG) { |
c66ac9db NB |
827 | list_add(&task->t_execute_list, |
828 | (task_prev != NULL) ? | |
829 | &task_prev->t_execute_list : | |
830 | &dev->execute_task_list); | |
831 | ||
6708bb27 | 832 | pr_debug("Set HEAD_OF_QUEUE for task CDB: 0x%02x" |
c66ac9db | 833 | " in execution queue\n", |
6708bb27 | 834 | task->task_se_cmd->t_task_cdb[0]); |
c66ac9db NB |
835 | return 1; |
836 | } | |
837 | /* | |
838 | * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been | |
839 | * transitioned from Dermant -> Active state, and are added to the end | |
840 | * of the struct se_device->execute_task_list | |
841 | */ | |
842 | list_add_tail(&task->t_execute_list, &dev->execute_task_list); | |
843 | return 0; | |
844 | } | |
845 | ||
846 | /* __transport_add_task_to_execute_queue(): | |
847 | * | |
848 | * Called with se_dev_t->execute_task_lock called. | |
849 | */ | |
850 | static void __transport_add_task_to_execute_queue( | |
851 | struct se_task *task, | |
852 | struct se_task *task_prev, | |
853 | struct se_device *dev) | |
854 | { | |
855 | int head_of_queue; | |
856 | ||
857 | head_of_queue = transport_add_task_check_sam_attr(task, task_prev, dev); | |
858 | atomic_inc(&dev->execute_tasks); | |
859 | ||
860 | if (atomic_read(&task->task_state_active)) | |
861 | return; | |
862 | /* | |
863 | * Determine if this task needs to go to HEAD_OF_QUEUE for the | |
864 | * state list as well. Running with SAM Task Attribute emulation | |
865 | * will always return head_of_queue == 0 here | |
866 | */ | |
867 | if (head_of_queue) | |
868 | list_add(&task->t_state_list, (task_prev) ? | |
869 | &task_prev->t_state_list : | |
870 | &dev->state_task_list); | |
871 | else | |
872 | list_add_tail(&task->t_state_list, &dev->state_task_list); | |
873 | ||
874 | atomic_set(&task->task_state_active, 1); | |
875 | ||
6708bb27 | 876 | pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n", |
e3d6f909 | 877 | task->task_se_cmd->se_tfo->get_task_tag(task->task_se_cmd), |
c66ac9db NB |
878 | task, dev); |
879 | } | |
880 | ||
881 | static void transport_add_tasks_to_state_queue(struct se_cmd *cmd) | |
882 | { | |
42bf829e | 883 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
884 | struct se_task *task; |
885 | unsigned long flags; | |
886 | ||
a1d8b49a AG |
887 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
888 | list_for_each_entry(task, &cmd->t_task_list, t_list) { | |
c66ac9db NB |
889 | if (atomic_read(&task->task_state_active)) |
890 | continue; | |
891 | ||
892 | spin_lock(&dev->execute_task_lock); | |
893 | list_add_tail(&task->t_state_list, &dev->state_task_list); | |
894 | atomic_set(&task->task_state_active, 1); | |
895 | ||
6708bb27 AG |
896 | pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n", |
897 | task->task_se_cmd->se_tfo->get_task_tag( | |
c66ac9db NB |
898 | task->task_se_cmd), task, dev); |
899 | ||
900 | spin_unlock(&dev->execute_task_lock); | |
901 | } | |
a1d8b49a | 902 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
903 | } |
904 | ||
905 | static void transport_add_tasks_from_cmd(struct se_cmd *cmd) | |
906 | { | |
5951146d | 907 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
908 | struct se_task *task, *task_prev = NULL; |
909 | unsigned long flags; | |
910 | ||
911 | spin_lock_irqsave(&dev->execute_task_lock, flags); | |
a1d8b49a | 912 | list_for_each_entry(task, &cmd->t_task_list, t_list) { |
04629b7b | 913 | if (!list_empty(&task->t_execute_list)) |
c66ac9db NB |
914 | continue; |
915 | /* | |
916 | * __transport_add_task_to_execute_queue() handles the | |
917 | * SAM Task Attribute emulation if enabled | |
918 | */ | |
919 | __transport_add_task_to_execute_queue(task, task_prev, dev); | |
c66ac9db NB |
920 | task_prev = task; |
921 | } | |
922 | spin_unlock_irqrestore(&dev->execute_task_lock, flags); | |
c66ac9db NB |
923 | } |
924 | ||
04629b7b CH |
925 | void __transport_remove_task_from_execute_queue(struct se_task *task, |
926 | struct se_device *dev) | |
927 | { | |
928 | list_del_init(&task->t_execute_list); | |
929 | atomic_dec(&dev->execute_tasks); | |
930 | } | |
931 | ||
52208ae3 | 932 | void transport_remove_task_from_execute_queue( |
c66ac9db NB |
933 | struct se_task *task, |
934 | struct se_device *dev) | |
935 | { | |
936 | unsigned long flags; | |
937 | ||
04629b7b | 938 | if (WARN_ON(list_empty(&task->t_execute_list))) |
af57c3ac | 939 | return; |
af57c3ac | 940 | |
c66ac9db | 941 | spin_lock_irqsave(&dev->execute_task_lock, flags); |
04629b7b | 942 | __transport_remove_task_from_execute_queue(task, dev); |
c66ac9db NB |
943 | spin_unlock_irqrestore(&dev->execute_task_lock, flags); |
944 | } | |
945 | ||
07bde79a NB |
946 | /* |
947 | * Handle QUEUE_FULL / -EAGAIN status | |
948 | */ | |
949 | ||
950 | static void target_qf_do_work(struct work_struct *work) | |
951 | { | |
952 | struct se_device *dev = container_of(work, struct se_device, | |
953 | qf_work_queue); | |
bcac364a | 954 | LIST_HEAD(qf_cmd_list); |
07bde79a NB |
955 | struct se_cmd *cmd, *cmd_tmp; |
956 | ||
957 | spin_lock_irq(&dev->qf_cmd_lock); | |
bcac364a RD |
958 | list_splice_init(&dev->qf_cmd_list, &qf_cmd_list); |
959 | spin_unlock_irq(&dev->qf_cmd_lock); | |
07bde79a | 960 | |
bcac364a | 961 | list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) { |
07bde79a NB |
962 | list_del(&cmd->se_qf_node); |
963 | atomic_dec(&dev->dev_qf_count); | |
964 | smp_mb__after_atomic_dec(); | |
07bde79a | 965 | |
6708bb27 | 966 | pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue" |
07bde79a | 967 | " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd, |
e057f533 | 968 | (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" : |
07bde79a NB |
969 | (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING" |
970 | : "UNKNOWN"); | |
f7a5cc0b CH |
971 | |
972 | transport_add_cmd_to_queue(cmd, cmd->t_state, true); | |
07bde79a | 973 | } |
07bde79a NB |
974 | } |
975 | ||
c66ac9db NB |
976 | unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd) |
977 | { | |
978 | switch (cmd->data_direction) { | |
979 | case DMA_NONE: | |
980 | return "NONE"; | |
981 | case DMA_FROM_DEVICE: | |
982 | return "READ"; | |
983 | case DMA_TO_DEVICE: | |
984 | return "WRITE"; | |
985 | case DMA_BIDIRECTIONAL: | |
986 | return "BIDI"; | |
987 | default: | |
988 | break; | |
989 | } | |
990 | ||
991 | return "UNKNOWN"; | |
992 | } | |
993 | ||
994 | void transport_dump_dev_state( | |
995 | struct se_device *dev, | |
996 | char *b, | |
997 | int *bl) | |
998 | { | |
999 | *bl += sprintf(b + *bl, "Status: "); | |
1000 | switch (dev->dev_status) { | |
1001 | case TRANSPORT_DEVICE_ACTIVATED: | |
1002 | *bl += sprintf(b + *bl, "ACTIVATED"); | |
1003 | break; | |
1004 | case TRANSPORT_DEVICE_DEACTIVATED: | |
1005 | *bl += sprintf(b + *bl, "DEACTIVATED"); | |
1006 | break; | |
1007 | case TRANSPORT_DEVICE_SHUTDOWN: | |
1008 | *bl += sprintf(b + *bl, "SHUTDOWN"); | |
1009 | break; | |
1010 | case TRANSPORT_DEVICE_OFFLINE_ACTIVATED: | |
1011 | case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED: | |
1012 | *bl += sprintf(b + *bl, "OFFLINE"); | |
1013 | break; | |
1014 | default: | |
1015 | *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status); | |
1016 | break; | |
1017 | } | |
1018 | ||
1019 | *bl += sprintf(b + *bl, " Execute/Left/Max Queue Depth: %d/%d/%d", | |
1020 | atomic_read(&dev->execute_tasks), atomic_read(&dev->depth_left), | |
1021 | dev->queue_depth); | |
1022 | *bl += sprintf(b + *bl, " SectorSize: %u MaxSectors: %u\n", | |
e3d6f909 | 1023 | dev->se_sub_dev->se_dev_attrib.block_size, dev->se_sub_dev->se_dev_attrib.max_sectors); |
c66ac9db NB |
1024 | *bl += sprintf(b + *bl, " "); |
1025 | } | |
1026 | ||
c66ac9db NB |
1027 | void transport_dump_vpd_proto_id( |
1028 | struct t10_vpd *vpd, | |
1029 | unsigned char *p_buf, | |
1030 | int p_buf_len) | |
1031 | { | |
1032 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
1033 | int len; | |
1034 | ||
1035 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
1036 | len = sprintf(buf, "T10 VPD Protocol Identifier: "); | |
1037 | ||
1038 | switch (vpd->protocol_identifier) { | |
1039 | case 0x00: | |
1040 | sprintf(buf+len, "Fibre Channel\n"); | |
1041 | break; | |
1042 | case 0x10: | |
1043 | sprintf(buf+len, "Parallel SCSI\n"); | |
1044 | break; | |
1045 | case 0x20: | |
1046 | sprintf(buf+len, "SSA\n"); | |
1047 | break; | |
1048 | case 0x30: | |
1049 | sprintf(buf+len, "IEEE 1394\n"); | |
1050 | break; | |
1051 | case 0x40: | |
1052 | sprintf(buf+len, "SCSI Remote Direct Memory Access" | |
1053 | " Protocol\n"); | |
1054 | break; | |
1055 | case 0x50: | |
1056 | sprintf(buf+len, "Internet SCSI (iSCSI)\n"); | |
1057 | break; | |
1058 | case 0x60: | |
1059 | sprintf(buf+len, "SAS Serial SCSI Protocol\n"); | |
1060 | break; | |
1061 | case 0x70: | |
1062 | sprintf(buf+len, "Automation/Drive Interface Transport" | |
1063 | " Protocol\n"); | |
1064 | break; | |
1065 | case 0x80: | |
1066 | sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n"); | |
1067 | break; | |
1068 | default: | |
1069 | sprintf(buf+len, "Unknown 0x%02x\n", | |
1070 | vpd->protocol_identifier); | |
1071 | break; | |
1072 | } | |
1073 | ||
1074 | if (p_buf) | |
1075 | strncpy(p_buf, buf, p_buf_len); | |
1076 | else | |
6708bb27 | 1077 | pr_debug("%s", buf); |
c66ac9db NB |
1078 | } |
1079 | ||
1080 | void | |
1081 | transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83) | |
1082 | { | |
1083 | /* | |
1084 | * Check if the Protocol Identifier Valid (PIV) bit is set.. | |
1085 | * | |
1086 | * from spc3r23.pdf section 7.5.1 | |
1087 | */ | |
1088 | if (page_83[1] & 0x80) { | |
1089 | vpd->protocol_identifier = (page_83[0] & 0xf0); | |
1090 | vpd->protocol_identifier_set = 1; | |
1091 | transport_dump_vpd_proto_id(vpd, NULL, 0); | |
1092 | } | |
1093 | } | |
1094 | EXPORT_SYMBOL(transport_set_vpd_proto_id); | |
1095 | ||
1096 | int transport_dump_vpd_assoc( | |
1097 | struct t10_vpd *vpd, | |
1098 | unsigned char *p_buf, | |
1099 | int p_buf_len) | |
1100 | { | |
1101 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
e3d6f909 AG |
1102 | int ret = 0; |
1103 | int len; | |
c66ac9db NB |
1104 | |
1105 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
1106 | len = sprintf(buf, "T10 VPD Identifier Association: "); | |
1107 | ||
1108 | switch (vpd->association) { | |
1109 | case 0x00: | |
1110 | sprintf(buf+len, "addressed logical unit\n"); | |
1111 | break; | |
1112 | case 0x10: | |
1113 | sprintf(buf+len, "target port\n"); | |
1114 | break; | |
1115 | case 0x20: | |
1116 | sprintf(buf+len, "SCSI target device\n"); | |
1117 | break; | |
1118 | default: | |
1119 | sprintf(buf+len, "Unknown 0x%02x\n", vpd->association); | |
e3d6f909 | 1120 | ret = -EINVAL; |
c66ac9db NB |
1121 | break; |
1122 | } | |
1123 | ||
1124 | if (p_buf) | |
1125 | strncpy(p_buf, buf, p_buf_len); | |
1126 | else | |
6708bb27 | 1127 | pr_debug("%s", buf); |
c66ac9db NB |
1128 | |
1129 | return ret; | |
1130 | } | |
1131 | ||
1132 | int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83) | |
1133 | { | |
1134 | /* | |
1135 | * The VPD identification association.. | |
1136 | * | |
1137 | * from spc3r23.pdf Section 7.6.3.1 Table 297 | |
1138 | */ | |
1139 | vpd->association = (page_83[1] & 0x30); | |
1140 | return transport_dump_vpd_assoc(vpd, NULL, 0); | |
1141 | } | |
1142 | EXPORT_SYMBOL(transport_set_vpd_assoc); | |
1143 | ||
1144 | int transport_dump_vpd_ident_type( | |
1145 | struct t10_vpd *vpd, | |
1146 | unsigned char *p_buf, | |
1147 | int p_buf_len) | |
1148 | { | |
1149 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
e3d6f909 AG |
1150 | int ret = 0; |
1151 | int len; | |
c66ac9db NB |
1152 | |
1153 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
1154 | len = sprintf(buf, "T10 VPD Identifier Type: "); | |
1155 | ||
1156 | switch (vpd->device_identifier_type) { | |
1157 | case 0x00: | |
1158 | sprintf(buf+len, "Vendor specific\n"); | |
1159 | break; | |
1160 | case 0x01: | |
1161 | sprintf(buf+len, "T10 Vendor ID based\n"); | |
1162 | break; | |
1163 | case 0x02: | |
1164 | sprintf(buf+len, "EUI-64 based\n"); | |
1165 | break; | |
1166 | case 0x03: | |
1167 | sprintf(buf+len, "NAA\n"); | |
1168 | break; | |
1169 | case 0x04: | |
1170 | sprintf(buf+len, "Relative target port identifier\n"); | |
1171 | break; | |
1172 | case 0x08: | |
1173 | sprintf(buf+len, "SCSI name string\n"); | |
1174 | break; | |
1175 | default: | |
1176 | sprintf(buf+len, "Unsupported: 0x%02x\n", | |
1177 | vpd->device_identifier_type); | |
e3d6f909 | 1178 | ret = -EINVAL; |
c66ac9db NB |
1179 | break; |
1180 | } | |
1181 | ||
e3d6f909 AG |
1182 | if (p_buf) { |
1183 | if (p_buf_len < strlen(buf)+1) | |
1184 | return -EINVAL; | |
c66ac9db | 1185 | strncpy(p_buf, buf, p_buf_len); |
e3d6f909 | 1186 | } else { |
6708bb27 | 1187 | pr_debug("%s", buf); |
e3d6f909 | 1188 | } |
c66ac9db NB |
1189 | |
1190 | return ret; | |
1191 | } | |
1192 | ||
1193 | int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83) | |
1194 | { | |
1195 | /* | |
1196 | * The VPD identifier type.. | |
1197 | * | |
1198 | * from spc3r23.pdf Section 7.6.3.1 Table 298 | |
1199 | */ | |
1200 | vpd->device_identifier_type = (page_83[1] & 0x0f); | |
1201 | return transport_dump_vpd_ident_type(vpd, NULL, 0); | |
1202 | } | |
1203 | EXPORT_SYMBOL(transport_set_vpd_ident_type); | |
1204 | ||
1205 | int transport_dump_vpd_ident( | |
1206 | struct t10_vpd *vpd, | |
1207 | unsigned char *p_buf, | |
1208 | int p_buf_len) | |
1209 | { | |
1210 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
1211 | int ret = 0; | |
1212 | ||
1213 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
1214 | ||
1215 | switch (vpd->device_identifier_code_set) { | |
1216 | case 0x01: /* Binary */ | |
1217 | sprintf(buf, "T10 VPD Binary Device Identifier: %s\n", | |
1218 | &vpd->device_identifier[0]); | |
1219 | break; | |
1220 | case 0x02: /* ASCII */ | |
1221 | sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n", | |
1222 | &vpd->device_identifier[0]); | |
1223 | break; | |
1224 | case 0x03: /* UTF-8 */ | |
1225 | sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n", | |
1226 | &vpd->device_identifier[0]); | |
1227 | break; | |
1228 | default: | |
1229 | sprintf(buf, "T10 VPD Device Identifier encoding unsupported:" | |
1230 | " 0x%02x", vpd->device_identifier_code_set); | |
e3d6f909 | 1231 | ret = -EINVAL; |
c66ac9db NB |
1232 | break; |
1233 | } | |
1234 | ||
1235 | if (p_buf) | |
1236 | strncpy(p_buf, buf, p_buf_len); | |
1237 | else | |
6708bb27 | 1238 | pr_debug("%s", buf); |
c66ac9db NB |
1239 | |
1240 | return ret; | |
1241 | } | |
1242 | ||
1243 | int | |
1244 | transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83) | |
1245 | { | |
1246 | static const char hex_str[] = "0123456789abcdef"; | |
1247 | int j = 0, i = 4; /* offset to start of the identifer */ | |
1248 | ||
1249 | /* | |
1250 | * The VPD Code Set (encoding) | |
1251 | * | |
1252 | * from spc3r23.pdf Section 7.6.3.1 Table 296 | |
1253 | */ | |
1254 | vpd->device_identifier_code_set = (page_83[0] & 0x0f); | |
1255 | switch (vpd->device_identifier_code_set) { | |
1256 | case 0x01: /* Binary */ | |
1257 | vpd->device_identifier[j++] = | |
1258 | hex_str[vpd->device_identifier_type]; | |
1259 | while (i < (4 + page_83[3])) { | |
1260 | vpd->device_identifier[j++] = | |
1261 | hex_str[(page_83[i] & 0xf0) >> 4]; | |
1262 | vpd->device_identifier[j++] = | |
1263 | hex_str[page_83[i] & 0x0f]; | |
1264 | i++; | |
1265 | } | |
1266 | break; | |
1267 | case 0x02: /* ASCII */ | |
1268 | case 0x03: /* UTF-8 */ | |
1269 | while (i < (4 + page_83[3])) | |
1270 | vpd->device_identifier[j++] = page_83[i++]; | |
1271 | break; | |
1272 | default: | |
1273 | break; | |
1274 | } | |
1275 | ||
1276 | return transport_dump_vpd_ident(vpd, NULL, 0); | |
1277 | } | |
1278 | EXPORT_SYMBOL(transport_set_vpd_ident); | |
1279 | ||
1280 | static void core_setup_task_attr_emulation(struct se_device *dev) | |
1281 | { | |
1282 | /* | |
1283 | * If this device is from Target_Core_Mod/pSCSI, disable the | |
1284 | * SAM Task Attribute emulation. | |
1285 | * | |
1286 | * This is currently not available in upsream Linux/SCSI Target | |
1287 | * mode code, and is assumed to be disabled while using TCM/pSCSI. | |
1288 | */ | |
e3d6f909 | 1289 | if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) { |
c66ac9db NB |
1290 | dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH; |
1291 | return; | |
1292 | } | |
1293 | ||
1294 | dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED; | |
6708bb27 | 1295 | pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x" |
e3d6f909 AG |
1296 | " device\n", dev->transport->name, |
1297 | dev->transport->get_device_rev(dev)); | |
c66ac9db NB |
1298 | } |
1299 | ||
1300 | static void scsi_dump_inquiry(struct se_device *dev) | |
1301 | { | |
e3d6f909 | 1302 | struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn; |
c66ac9db NB |
1303 | int i, device_type; |
1304 | /* | |
1305 | * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer | |
1306 | */ | |
6708bb27 | 1307 | pr_debug(" Vendor: "); |
c66ac9db NB |
1308 | for (i = 0; i < 8; i++) |
1309 | if (wwn->vendor[i] >= 0x20) | |
6708bb27 | 1310 | pr_debug("%c", wwn->vendor[i]); |
c66ac9db | 1311 | else |
6708bb27 | 1312 | pr_debug(" "); |
c66ac9db | 1313 | |
6708bb27 | 1314 | pr_debug(" Model: "); |
c66ac9db NB |
1315 | for (i = 0; i < 16; i++) |
1316 | if (wwn->model[i] >= 0x20) | |
6708bb27 | 1317 | pr_debug("%c", wwn->model[i]); |
c66ac9db | 1318 | else |
6708bb27 | 1319 | pr_debug(" "); |
c66ac9db | 1320 | |
6708bb27 | 1321 | pr_debug(" Revision: "); |
c66ac9db NB |
1322 | for (i = 0; i < 4; i++) |
1323 | if (wwn->revision[i] >= 0x20) | |
6708bb27 | 1324 | pr_debug("%c", wwn->revision[i]); |
c66ac9db | 1325 | else |
6708bb27 | 1326 | pr_debug(" "); |
c66ac9db | 1327 | |
6708bb27 | 1328 | pr_debug("\n"); |
c66ac9db | 1329 | |
e3d6f909 | 1330 | device_type = dev->transport->get_device_type(dev); |
6708bb27 AG |
1331 | pr_debug(" Type: %s ", scsi_device_type(device_type)); |
1332 | pr_debug(" ANSI SCSI revision: %02x\n", | |
e3d6f909 | 1333 | dev->transport->get_device_rev(dev)); |
c66ac9db NB |
1334 | } |
1335 | ||
1336 | struct se_device *transport_add_device_to_core_hba( | |
1337 | struct se_hba *hba, | |
1338 | struct se_subsystem_api *transport, | |
1339 | struct se_subsystem_dev *se_dev, | |
1340 | u32 device_flags, | |
1341 | void *transport_dev, | |
1342 | struct se_dev_limits *dev_limits, | |
1343 | const char *inquiry_prod, | |
1344 | const char *inquiry_rev) | |
1345 | { | |
12a18bdc | 1346 | int force_pt; |
c66ac9db NB |
1347 | struct se_device *dev; |
1348 | ||
1349 | dev = kzalloc(sizeof(struct se_device), GFP_KERNEL); | |
6708bb27 AG |
1350 | if (!dev) { |
1351 | pr_err("Unable to allocate memory for se_dev_t\n"); | |
c66ac9db NB |
1352 | return NULL; |
1353 | } | |
c66ac9db | 1354 | |
e3d6f909 | 1355 | transport_init_queue_obj(&dev->dev_queue_obj); |
c66ac9db NB |
1356 | dev->dev_flags = device_flags; |
1357 | dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED; | |
5951146d | 1358 | dev->dev_ptr = transport_dev; |
c66ac9db NB |
1359 | dev->se_hba = hba; |
1360 | dev->se_sub_dev = se_dev; | |
1361 | dev->transport = transport; | |
1362 | atomic_set(&dev->active_cmds, 0); | |
1363 | INIT_LIST_HEAD(&dev->dev_list); | |
1364 | INIT_LIST_HEAD(&dev->dev_sep_list); | |
1365 | INIT_LIST_HEAD(&dev->dev_tmr_list); | |
1366 | INIT_LIST_HEAD(&dev->execute_task_list); | |
1367 | INIT_LIST_HEAD(&dev->delayed_cmd_list); | |
1368 | INIT_LIST_HEAD(&dev->ordered_cmd_list); | |
1369 | INIT_LIST_HEAD(&dev->state_task_list); | |
07bde79a | 1370 | INIT_LIST_HEAD(&dev->qf_cmd_list); |
c66ac9db NB |
1371 | spin_lock_init(&dev->execute_task_lock); |
1372 | spin_lock_init(&dev->delayed_cmd_lock); | |
1373 | spin_lock_init(&dev->ordered_cmd_lock); | |
1374 | spin_lock_init(&dev->state_task_lock); | |
1375 | spin_lock_init(&dev->dev_alua_lock); | |
1376 | spin_lock_init(&dev->dev_reservation_lock); | |
1377 | spin_lock_init(&dev->dev_status_lock); | |
1378 | spin_lock_init(&dev->dev_status_thr_lock); | |
1379 | spin_lock_init(&dev->se_port_lock); | |
1380 | spin_lock_init(&dev->se_tmr_lock); | |
07bde79a | 1381 | spin_lock_init(&dev->qf_cmd_lock); |
c66ac9db NB |
1382 | |
1383 | dev->queue_depth = dev_limits->queue_depth; | |
1384 | atomic_set(&dev->depth_left, dev->queue_depth); | |
1385 | atomic_set(&dev->dev_ordered_id, 0); | |
1386 | ||
1387 | se_dev_set_default_attribs(dev, dev_limits); | |
1388 | ||
1389 | dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX); | |
1390 | dev->creation_time = get_jiffies_64(); | |
1391 | spin_lock_init(&dev->stats_lock); | |
1392 | ||
1393 | spin_lock(&hba->device_lock); | |
1394 | list_add_tail(&dev->dev_list, &hba->hba_dev_list); | |
1395 | hba->dev_count++; | |
1396 | spin_unlock(&hba->device_lock); | |
1397 | /* | |
1398 | * Setup the SAM Task Attribute emulation for struct se_device | |
1399 | */ | |
1400 | core_setup_task_attr_emulation(dev); | |
1401 | /* | |
1402 | * Force PR and ALUA passthrough emulation with internal object use. | |
1403 | */ | |
1404 | force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE); | |
1405 | /* | |
1406 | * Setup the Reservations infrastructure for struct se_device | |
1407 | */ | |
1408 | core_setup_reservations(dev, force_pt); | |
1409 | /* | |
1410 | * Setup the Asymmetric Logical Unit Assignment for struct se_device | |
1411 | */ | |
1412 | if (core_setup_alua(dev, force_pt) < 0) | |
1413 | goto out; | |
1414 | ||
1415 | /* | |
1416 | * Startup the struct se_device processing thread | |
1417 | */ | |
1418 | dev->process_thread = kthread_run(transport_processing_thread, dev, | |
e3d6f909 | 1419 | "LIO_%s", dev->transport->name); |
c66ac9db | 1420 | if (IS_ERR(dev->process_thread)) { |
6708bb27 | 1421 | pr_err("Unable to create kthread: LIO_%s\n", |
e3d6f909 | 1422 | dev->transport->name); |
c66ac9db NB |
1423 | goto out; |
1424 | } | |
07bde79a NB |
1425 | /* |
1426 | * Setup work_queue for QUEUE_FULL | |
1427 | */ | |
1428 | INIT_WORK(&dev->qf_work_queue, target_qf_do_work); | |
c66ac9db NB |
1429 | /* |
1430 | * Preload the initial INQUIRY const values if we are doing | |
1431 | * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI | |
1432 | * passthrough because this is being provided by the backend LLD. | |
1433 | * This is required so that transport_get_inquiry() copies these | |
1434 | * originals once back into DEV_T10_WWN(dev) for the virtual device | |
1435 | * setup. | |
1436 | */ | |
e3d6f909 | 1437 | if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) { |
f22c1196 | 1438 | if (!inquiry_prod || !inquiry_rev) { |
6708bb27 | 1439 | pr_err("All non TCM/pSCSI plugins require" |
c66ac9db NB |
1440 | " INQUIRY consts\n"); |
1441 | goto out; | |
1442 | } | |
1443 | ||
e3d6f909 AG |
1444 | strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8); |
1445 | strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16); | |
1446 | strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4); | |
c66ac9db NB |
1447 | } |
1448 | scsi_dump_inquiry(dev); | |
1449 | ||
12a18bdc | 1450 | return dev; |
c66ac9db | 1451 | out: |
c66ac9db NB |
1452 | kthread_stop(dev->process_thread); |
1453 | ||
1454 | spin_lock(&hba->device_lock); | |
1455 | list_del(&dev->dev_list); | |
1456 | hba->dev_count--; | |
1457 | spin_unlock(&hba->device_lock); | |
1458 | ||
1459 | se_release_vpd_for_dev(dev); | |
1460 | ||
c66ac9db NB |
1461 | kfree(dev); |
1462 | ||
1463 | return NULL; | |
1464 | } | |
1465 | EXPORT_SYMBOL(transport_add_device_to_core_hba); | |
1466 | ||
1467 | /* transport_generic_prepare_cdb(): | |
1468 | * | |
1469 | * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will | |
1470 | * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2. | |
1471 | * The point of this is since we are mapping iSCSI LUNs to | |
1472 | * SCSI Target IDs having a non-zero LUN in the CDB will throw the | |
1473 | * devices and HBAs for a loop. | |
1474 | */ | |
1475 | static inline void transport_generic_prepare_cdb( | |
1476 | unsigned char *cdb) | |
1477 | { | |
1478 | switch (cdb[0]) { | |
1479 | case READ_10: /* SBC - RDProtect */ | |
1480 | case READ_12: /* SBC - RDProtect */ | |
1481 | case READ_16: /* SBC - RDProtect */ | |
1482 | case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */ | |
1483 | case VERIFY: /* SBC - VRProtect */ | |
1484 | case VERIFY_16: /* SBC - VRProtect */ | |
1485 | case WRITE_VERIFY: /* SBC - VRProtect */ | |
1486 | case WRITE_VERIFY_12: /* SBC - VRProtect */ | |
1487 | break; | |
1488 | default: | |
1489 | cdb[1] &= 0x1f; /* clear logical unit number */ | |
1490 | break; | |
1491 | } | |
1492 | } | |
1493 | ||
1494 | static struct se_task * | |
1495 | transport_generic_get_task(struct se_cmd *cmd, | |
1496 | enum dma_data_direction data_direction) | |
1497 | { | |
1498 | struct se_task *task; | |
5951146d | 1499 | struct se_device *dev = cmd->se_dev; |
c66ac9db | 1500 | |
6708bb27 | 1501 | task = dev->transport->alloc_task(cmd->t_task_cdb); |
c66ac9db | 1502 | if (!task) { |
6708bb27 | 1503 | pr_err("Unable to allocate struct se_task\n"); |
c66ac9db NB |
1504 | return NULL; |
1505 | } | |
1506 | ||
1507 | INIT_LIST_HEAD(&task->t_list); | |
1508 | INIT_LIST_HEAD(&task->t_execute_list); | |
1509 | INIT_LIST_HEAD(&task->t_state_list); | |
1510 | init_completion(&task->task_stop_comp); | |
c66ac9db | 1511 | task->task_se_cmd = cmd; |
c66ac9db NB |
1512 | task->task_data_direction = data_direction; |
1513 | ||
c66ac9db NB |
1514 | return task; |
1515 | } | |
1516 | ||
1517 | static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *); | |
1518 | ||
c66ac9db NB |
1519 | /* |
1520 | * Used by fabric modules containing a local struct se_cmd within their | |
1521 | * fabric dependent per I/O descriptor. | |
1522 | */ | |
1523 | void transport_init_se_cmd( | |
1524 | struct se_cmd *cmd, | |
1525 | struct target_core_fabric_ops *tfo, | |
1526 | struct se_session *se_sess, | |
1527 | u32 data_length, | |
1528 | int data_direction, | |
1529 | int task_attr, | |
1530 | unsigned char *sense_buffer) | |
1531 | { | |
5951146d AG |
1532 | INIT_LIST_HEAD(&cmd->se_lun_node); |
1533 | INIT_LIST_HEAD(&cmd->se_delayed_node); | |
1534 | INIT_LIST_HEAD(&cmd->se_ordered_node); | |
07bde79a | 1535 | INIT_LIST_HEAD(&cmd->se_qf_node); |
79a7fef2 | 1536 | INIT_LIST_HEAD(&cmd->se_queue_node); |
c66ac9db | 1537 | |
a1d8b49a AG |
1538 | INIT_LIST_HEAD(&cmd->t_task_list); |
1539 | init_completion(&cmd->transport_lun_fe_stop_comp); | |
1540 | init_completion(&cmd->transport_lun_stop_comp); | |
1541 | init_completion(&cmd->t_transport_stop_comp); | |
1542 | spin_lock_init(&cmd->t_state_lock); | |
1543 | atomic_set(&cmd->transport_dev_active, 1); | |
c66ac9db NB |
1544 | |
1545 | cmd->se_tfo = tfo; | |
1546 | cmd->se_sess = se_sess; | |
1547 | cmd->data_length = data_length; | |
1548 | cmd->data_direction = data_direction; | |
1549 | cmd->sam_task_attr = task_attr; | |
1550 | cmd->sense_buffer = sense_buffer; | |
1551 | } | |
1552 | EXPORT_SYMBOL(transport_init_se_cmd); | |
1553 | ||
1554 | static int transport_check_alloc_task_attr(struct se_cmd *cmd) | |
1555 | { | |
1556 | /* | |
1557 | * Check if SAM Task Attribute emulation is enabled for this | |
1558 | * struct se_device storage object | |
1559 | */ | |
5951146d | 1560 | if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) |
c66ac9db NB |
1561 | return 0; |
1562 | ||
e66ecd50 | 1563 | if (cmd->sam_task_attr == MSG_ACA_TAG) { |
6708bb27 | 1564 | pr_debug("SAM Task Attribute ACA" |
c66ac9db | 1565 | " emulation is not supported\n"); |
e3d6f909 | 1566 | return -EINVAL; |
c66ac9db NB |
1567 | } |
1568 | /* | |
1569 | * Used to determine when ORDERED commands should go from | |
1570 | * Dormant to Active status. | |
1571 | */ | |
5951146d | 1572 | cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id); |
c66ac9db | 1573 | smp_mb__after_atomic_inc(); |
6708bb27 | 1574 | pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n", |
c66ac9db | 1575 | cmd->se_ordered_id, cmd->sam_task_attr, |
6708bb27 | 1576 | cmd->se_dev->transport->name); |
c66ac9db NB |
1577 | return 0; |
1578 | } | |
1579 | ||
c66ac9db NB |
1580 | /* transport_generic_allocate_tasks(): |
1581 | * | |
1582 | * Called from fabric RX Thread. | |
1583 | */ | |
1584 | int transport_generic_allocate_tasks( | |
1585 | struct se_cmd *cmd, | |
1586 | unsigned char *cdb) | |
1587 | { | |
1588 | int ret; | |
1589 | ||
1590 | transport_generic_prepare_cdb(cdb); | |
c66ac9db NB |
1591 | /* |
1592 | * Ensure that the received CDB is less than the max (252 + 8) bytes | |
1593 | * for VARIABLE_LENGTH_CMD | |
1594 | */ | |
1595 | if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) { | |
6708bb27 | 1596 | pr_err("Received SCSI CDB with command_size: %d that" |
c66ac9db NB |
1597 | " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n", |
1598 | scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE); | |
e3d6f909 | 1599 | return -EINVAL; |
c66ac9db NB |
1600 | } |
1601 | /* | |
1602 | * If the received CDB is larger than TCM_MAX_COMMAND_SIZE, | |
1603 | * allocate the additional extended CDB buffer now.. Otherwise | |
1604 | * setup the pointer from __t_task_cdb to t_task_cdb. | |
1605 | */ | |
a1d8b49a AG |
1606 | if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) { |
1607 | cmd->t_task_cdb = kzalloc(scsi_command_size(cdb), | |
c66ac9db | 1608 | GFP_KERNEL); |
6708bb27 AG |
1609 | if (!cmd->t_task_cdb) { |
1610 | pr_err("Unable to allocate cmd->t_task_cdb" | |
a1d8b49a | 1611 | " %u > sizeof(cmd->__t_task_cdb): %lu ops\n", |
c66ac9db | 1612 | scsi_command_size(cdb), |
a1d8b49a | 1613 | (unsigned long)sizeof(cmd->__t_task_cdb)); |
e3d6f909 | 1614 | return -ENOMEM; |
c66ac9db NB |
1615 | } |
1616 | } else | |
a1d8b49a | 1617 | cmd->t_task_cdb = &cmd->__t_task_cdb[0]; |
c66ac9db | 1618 | /* |
a1d8b49a | 1619 | * Copy the original CDB into cmd-> |
c66ac9db | 1620 | */ |
a1d8b49a | 1621 | memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb)); |
c66ac9db NB |
1622 | /* |
1623 | * Setup the received CDB based on SCSI defined opcodes and | |
1624 | * perform unit attention, persistent reservations and ALUA | |
a1d8b49a | 1625 | * checks for virtual device backends. The cmd->t_task_cdb |
c66ac9db NB |
1626 | * pointer is expected to be setup before we reach this point. |
1627 | */ | |
1628 | ret = transport_generic_cmd_sequencer(cmd, cdb); | |
1629 | if (ret < 0) | |
1630 | return ret; | |
1631 | /* | |
1632 | * Check for SAM Task Attribute Emulation | |
1633 | */ | |
1634 | if (transport_check_alloc_task_attr(cmd) < 0) { | |
1635 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
1636 | cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; | |
5951146d | 1637 | return -EINVAL; |
c66ac9db NB |
1638 | } |
1639 | spin_lock(&cmd->se_lun->lun_sep_lock); | |
1640 | if (cmd->se_lun->lun_sep) | |
1641 | cmd->se_lun->lun_sep->sep_stats.cmd_pdus++; | |
1642 | spin_unlock(&cmd->se_lun->lun_sep_lock); | |
1643 | return 0; | |
1644 | } | |
1645 | EXPORT_SYMBOL(transport_generic_allocate_tasks); | |
1646 | ||
dd8ae59d NB |
1647 | static void transport_generic_request_failure(struct se_cmd *, |
1648 | struct se_device *, int, int); | |
695434e1 NB |
1649 | /* |
1650 | * Used by fabric module frontends to queue tasks directly. | |
1651 | * Many only be used from process context only | |
1652 | */ | |
1653 | int transport_handle_cdb_direct( | |
1654 | struct se_cmd *cmd) | |
1655 | { | |
dd8ae59d NB |
1656 | int ret; |
1657 | ||
695434e1 NB |
1658 | if (!cmd->se_lun) { |
1659 | dump_stack(); | |
6708bb27 | 1660 | pr_err("cmd->se_lun is NULL\n"); |
695434e1 NB |
1661 | return -EINVAL; |
1662 | } | |
1663 | if (in_interrupt()) { | |
1664 | dump_stack(); | |
6708bb27 | 1665 | pr_err("transport_generic_handle_cdb cannot be called" |
695434e1 NB |
1666 | " from interrupt context\n"); |
1667 | return -EINVAL; | |
1668 | } | |
dd8ae59d NB |
1669 | /* |
1670 | * Set TRANSPORT_NEW_CMD state and cmd->t_transport_active=1 following | |
1671 | * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue() | |
1672 | * in existing usage to ensure that outstanding descriptors are handled | |
d14921d6 | 1673 | * correctly during shutdown via transport_wait_for_tasks() |
dd8ae59d NB |
1674 | * |
1675 | * Also, we don't take cmd->t_state_lock here as we only expect | |
1676 | * this to be called for initial descriptor submission. | |
1677 | */ | |
1678 | cmd->t_state = TRANSPORT_NEW_CMD; | |
1679 | atomic_set(&cmd->t_transport_active, 1); | |
1680 | /* | |
1681 | * transport_generic_new_cmd() is already handling QUEUE_FULL, | |
1682 | * so follow TRANSPORT_NEW_CMD processing thread context usage | |
1683 | * and call transport_generic_request_failure() if necessary.. | |
1684 | */ | |
1685 | ret = transport_generic_new_cmd(cmd); | |
1686 | if (ret == -EAGAIN) | |
1687 | return 0; | |
1688 | else if (ret < 0) { | |
1689 | cmd->transport_error_status = ret; | |
1690 | transport_generic_request_failure(cmd, NULL, 0, | |
1691 | (cmd->data_direction != DMA_TO_DEVICE)); | |
1692 | } | |
1693 | return 0; | |
695434e1 NB |
1694 | } |
1695 | EXPORT_SYMBOL(transport_handle_cdb_direct); | |
1696 | ||
c66ac9db NB |
1697 | /* |
1698 | * Used by fabric module frontends defining a TFO->new_cmd_map() caller | |
1699 | * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to | |
1700 | * complete setup in TCM process context w/ TFO->new_cmd_map(). | |
1701 | */ | |
1702 | int transport_generic_handle_cdb_map( | |
1703 | struct se_cmd *cmd) | |
1704 | { | |
e3d6f909 | 1705 | if (!cmd->se_lun) { |
c66ac9db | 1706 | dump_stack(); |
6708bb27 | 1707 | pr_err("cmd->se_lun is NULL\n"); |
e3d6f909 | 1708 | return -EINVAL; |
c66ac9db NB |
1709 | } |
1710 | ||
f7a5cc0b | 1711 | transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP, false); |
c66ac9db NB |
1712 | return 0; |
1713 | } | |
1714 | EXPORT_SYMBOL(transport_generic_handle_cdb_map); | |
1715 | ||
1716 | /* transport_generic_handle_data(): | |
1717 | * | |
1718 | * | |
1719 | */ | |
1720 | int transport_generic_handle_data( | |
1721 | struct se_cmd *cmd) | |
1722 | { | |
1723 | /* | |
1724 | * For the software fabric case, then we assume the nexus is being | |
1725 | * failed/shutdown when signals are pending from the kthread context | |
1726 | * caller, so we return a failure. For the HW target mode case running | |
1727 | * in interrupt code, the signal_pending() check is skipped. | |
1728 | */ | |
1729 | if (!in_interrupt() && signal_pending(current)) | |
e3d6f909 | 1730 | return -EPERM; |
c66ac9db NB |
1731 | /* |
1732 | * If the received CDB has aleady been ABORTED by the generic | |
1733 | * target engine, we now call transport_check_aborted_status() | |
1734 | * to queue any delated TASK_ABORTED status for the received CDB to the | |
25985edc | 1735 | * fabric module as we are expecting no further incoming DATA OUT |
c66ac9db NB |
1736 | * sequences at this point. |
1737 | */ | |
1738 | if (transport_check_aborted_status(cmd, 1) != 0) | |
1739 | return 0; | |
1740 | ||
f7a5cc0b | 1741 | transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE, false); |
c66ac9db NB |
1742 | return 0; |
1743 | } | |
1744 | EXPORT_SYMBOL(transport_generic_handle_data); | |
1745 | ||
1746 | /* transport_generic_handle_tmr(): | |
1747 | * | |
1748 | * | |
1749 | */ | |
1750 | int transport_generic_handle_tmr( | |
1751 | struct se_cmd *cmd) | |
1752 | { | |
f7a5cc0b | 1753 | transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR, false); |
c66ac9db NB |
1754 | return 0; |
1755 | } | |
1756 | EXPORT_SYMBOL(transport_generic_handle_tmr); | |
1757 | ||
f4366772 NB |
1758 | void transport_generic_free_cmd_intr( |
1759 | struct se_cmd *cmd) | |
1760 | { | |
f7a5cc0b | 1761 | transport_add_cmd_to_queue(cmd, TRANSPORT_FREE_CMD_INTR, false); |
f4366772 NB |
1762 | } |
1763 | EXPORT_SYMBOL(transport_generic_free_cmd_intr); | |
1764 | ||
c66ac9db NB |
1765 | static int transport_stop_tasks_for_cmd(struct se_cmd *cmd) |
1766 | { | |
1767 | struct se_task *task, *task_tmp; | |
1768 | unsigned long flags; | |
1769 | int ret = 0; | |
1770 | ||
6708bb27 | 1771 | pr_debug("ITT[0x%08x] - Stopping tasks\n", |
e3d6f909 | 1772 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db NB |
1773 | |
1774 | /* | |
1775 | * No tasks remain in the execution queue | |
1776 | */ | |
a1d8b49a | 1777 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 1778 | list_for_each_entry_safe(task, task_tmp, |
a1d8b49a | 1779 | &cmd->t_task_list, t_list) { |
04629b7b | 1780 | pr_debug("Processing task %p\n", task); |
c66ac9db NB |
1781 | /* |
1782 | * If the struct se_task has not been sent and is not active, | |
1783 | * remove the struct se_task from the execution queue. | |
1784 | */ | |
6c76bf95 | 1785 | if (!(task->task_flags & (TF_ACTIVE | TF_SENT))) { |
a1d8b49a | 1786 | spin_unlock_irqrestore(&cmd->t_state_lock, |
c66ac9db NB |
1787 | flags); |
1788 | transport_remove_task_from_execute_queue(task, | |
42bf829e | 1789 | cmd->se_dev); |
c66ac9db | 1790 | |
04629b7b | 1791 | pr_debug("Task %p removed from execute queue\n", task); |
a1d8b49a | 1792 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db NB |
1793 | continue; |
1794 | } | |
1795 | ||
1796 | /* | |
1797 | * If the struct se_task is active, sleep until it is returned | |
1798 | * from the plugin. | |
1799 | */ | |
6c76bf95 CH |
1800 | if (task->task_flags & TF_ACTIVE) { |
1801 | task->task_flags |= TF_REQUEST_STOP; | |
a1d8b49a | 1802 | spin_unlock_irqrestore(&cmd->t_state_lock, |
c66ac9db NB |
1803 | flags); |
1804 | ||
04629b7b | 1805 | pr_debug("Task %p waiting to complete\n", task); |
c66ac9db | 1806 | wait_for_completion(&task->task_stop_comp); |
04629b7b | 1807 | pr_debug("Task %p stopped successfully\n", task); |
c66ac9db | 1808 | |
a1d8b49a AG |
1809 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
1810 | atomic_dec(&cmd->t_task_cdbs_left); | |
6c76bf95 | 1811 | task->task_flags &= ~(TF_ACTIVE | TF_REQUEST_STOP); |
c66ac9db | 1812 | } else { |
04629b7b | 1813 | pr_debug("Task %p - did nothing\n", task); |
c66ac9db NB |
1814 | ret++; |
1815 | } | |
1816 | ||
1817 | __transport_stop_task_timer(task, &flags); | |
1818 | } | |
a1d8b49a | 1819 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
1820 | |
1821 | return ret; | |
1822 | } | |
1823 | ||
c66ac9db NB |
1824 | /* |
1825 | * Handle SAM-esque emulation for generic transport request failures. | |
1826 | */ | |
1827 | static void transport_generic_request_failure( | |
1828 | struct se_cmd *cmd, | |
1829 | struct se_device *dev, | |
1830 | int complete, | |
1831 | int sc) | |
1832 | { | |
07bde79a NB |
1833 | int ret = 0; |
1834 | ||
6708bb27 | 1835 | pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x" |
e3d6f909 | 1836 | " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd), |
a1d8b49a | 1837 | cmd->t_task_cdb[0]); |
6708bb27 | 1838 | pr_debug("-----[ i_state: %d t_state/def_t_state:" |
c66ac9db | 1839 | " %d/%d transport_error_status: %d\n", |
e3d6f909 | 1840 | cmd->se_tfo->get_cmd_state(cmd), |
c66ac9db NB |
1841 | cmd->t_state, cmd->deferred_t_state, |
1842 | cmd->transport_error_status); | |
6708bb27 | 1843 | pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d" |
c66ac9db NB |
1844 | " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --" |
1845 | " t_transport_active: %d t_transport_stop: %d" | |
6708bb27 | 1846 | " t_transport_sent: %d\n", cmd->t_task_list_num, |
a1d8b49a AG |
1847 | atomic_read(&cmd->t_task_cdbs_left), |
1848 | atomic_read(&cmd->t_task_cdbs_sent), | |
1849 | atomic_read(&cmd->t_task_cdbs_ex_left), | |
1850 | atomic_read(&cmd->t_transport_active), | |
1851 | atomic_read(&cmd->t_transport_stop), | |
1852 | atomic_read(&cmd->t_transport_sent)); | |
c66ac9db NB |
1853 | |
1854 | transport_stop_all_task_timers(cmd); | |
1855 | ||
1856 | if (dev) | |
e3d6f909 | 1857 | atomic_inc(&dev->depth_left); |
c66ac9db NB |
1858 | /* |
1859 | * For SAM Task Attribute emulation for failed struct se_cmd | |
1860 | */ | |
1861 | if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) | |
1862 | transport_complete_task_attr(cmd); | |
1863 | ||
1864 | if (complete) { | |
1865 | transport_direct_request_timeout(cmd); | |
1866 | cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE; | |
1867 | } | |
1868 | ||
1869 | switch (cmd->transport_error_status) { | |
1870 | case PYX_TRANSPORT_UNKNOWN_SAM_OPCODE: | |
1871 | cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; | |
1872 | break; | |
1873 | case PYX_TRANSPORT_REQ_TOO_MANY_SECTORS: | |
1874 | cmd->scsi_sense_reason = TCM_SECTOR_COUNT_TOO_MANY; | |
1875 | break; | |
1876 | case PYX_TRANSPORT_INVALID_CDB_FIELD: | |
1877 | cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; | |
1878 | break; | |
1879 | case PYX_TRANSPORT_INVALID_PARAMETER_LIST: | |
1880 | cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; | |
1881 | break; | |
1882 | case PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES: | |
1883 | if (!sc) | |
1884 | transport_new_cmd_failure(cmd); | |
1885 | /* | |
1886 | * Currently for PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES, | |
1887 | * we force this session to fall back to session | |
1888 | * recovery. | |
1889 | */ | |
e3d6f909 AG |
1890 | cmd->se_tfo->fall_back_to_erl0(cmd->se_sess); |
1891 | cmd->se_tfo->stop_session(cmd->se_sess, 0, 0); | |
c66ac9db NB |
1892 | |
1893 | goto check_stop; | |
1894 | case PYX_TRANSPORT_LU_COMM_FAILURE: | |
1895 | case PYX_TRANSPORT_ILLEGAL_REQUEST: | |
1896 | cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
1897 | break; | |
1898 | case PYX_TRANSPORT_UNKNOWN_MODE_PAGE: | |
1899 | cmd->scsi_sense_reason = TCM_UNKNOWN_MODE_PAGE; | |
1900 | break; | |
1901 | case PYX_TRANSPORT_WRITE_PROTECTED: | |
1902 | cmd->scsi_sense_reason = TCM_WRITE_PROTECTED; | |
1903 | break; | |
1904 | case PYX_TRANSPORT_RESERVATION_CONFLICT: | |
1905 | /* | |
1906 | * No SENSE Data payload for this case, set SCSI Status | |
1907 | * and queue the response to $FABRIC_MOD. | |
1908 | * | |
1909 | * Uses linux/include/scsi/scsi.h SAM status codes defs | |
1910 | */ | |
1911 | cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT; | |
1912 | /* | |
1913 | * For UA Interlock Code 11b, a RESERVATION CONFLICT will | |
1914 | * establish a UNIT ATTENTION with PREVIOUS RESERVATION | |
1915 | * CONFLICT STATUS. | |
1916 | * | |
1917 | * See spc4r17, section 7.4.6 Control Mode Page, Table 349 | |
1918 | */ | |
e3d6f909 AG |
1919 | if (cmd->se_sess && |
1920 | cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2) | |
1921 | core_scsi3_ua_allocate(cmd->se_sess->se_node_acl, | |
c66ac9db NB |
1922 | cmd->orig_fe_lun, 0x2C, |
1923 | ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS); | |
1924 | ||
07bde79a NB |
1925 | ret = cmd->se_tfo->queue_status(cmd); |
1926 | if (ret == -EAGAIN) | |
1927 | goto queue_full; | |
c66ac9db NB |
1928 | goto check_stop; |
1929 | case PYX_TRANSPORT_USE_SENSE_REASON: | |
1930 | /* | |
1931 | * struct se_cmd->scsi_sense_reason already set | |
1932 | */ | |
1933 | break; | |
1934 | default: | |
6708bb27 | 1935 | pr_err("Unknown transport error for CDB 0x%02x: %d\n", |
a1d8b49a | 1936 | cmd->t_task_cdb[0], |
c66ac9db NB |
1937 | cmd->transport_error_status); |
1938 | cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; | |
1939 | break; | |
1940 | } | |
16ab8e60 NB |
1941 | /* |
1942 | * If a fabric does not define a cmd->se_tfo->new_cmd_map caller, | |
1943 | * make the call to transport_send_check_condition_and_sense() | |
1944 | * directly. Otherwise expect the fabric to make the call to | |
1945 | * transport_send_check_condition_and_sense() after handling | |
1946 | * possible unsoliticied write data payloads. | |
1947 | */ | |
1948 | if (!sc && !cmd->se_tfo->new_cmd_map) | |
c66ac9db | 1949 | transport_new_cmd_failure(cmd); |
07bde79a NB |
1950 | else { |
1951 | ret = transport_send_check_condition_and_sense(cmd, | |
1952 | cmd->scsi_sense_reason, 0); | |
1953 | if (ret == -EAGAIN) | |
1954 | goto queue_full; | |
1955 | } | |
1956 | ||
c66ac9db NB |
1957 | check_stop: |
1958 | transport_lun_remove_cmd(cmd); | |
6708bb27 | 1959 | if (!transport_cmd_check_stop_to_fabric(cmd)) |
c66ac9db | 1960 | ; |
07bde79a NB |
1961 | return; |
1962 | ||
1963 | queue_full: | |
e057f533 CH |
1964 | cmd->t_state = TRANSPORT_COMPLETE_QF_OK; |
1965 | transport_handle_queue_full(cmd, cmd->se_dev); | |
c66ac9db NB |
1966 | } |
1967 | ||
1968 | static void transport_direct_request_timeout(struct se_cmd *cmd) | |
1969 | { | |
1970 | unsigned long flags; | |
1971 | ||
a1d8b49a | 1972 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
6708bb27 | 1973 | if (!atomic_read(&cmd->t_transport_timeout)) { |
a1d8b49a | 1974 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
1975 | return; |
1976 | } | |
a1d8b49a AG |
1977 | if (atomic_read(&cmd->t_task_cdbs_timeout_left)) { |
1978 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
c66ac9db NB |
1979 | return; |
1980 | } | |
1981 | ||
a1d8b49a AG |
1982 | atomic_sub(atomic_read(&cmd->t_transport_timeout), |
1983 | &cmd->t_se_count); | |
1984 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
c66ac9db NB |
1985 | } |
1986 | ||
1987 | static void transport_generic_request_timeout(struct se_cmd *cmd) | |
1988 | { | |
1989 | unsigned long flags; | |
1990 | ||
1991 | /* | |
e6a2573f | 1992 | * Reset cmd->t_se_count to allow transport_put_cmd() |
c66ac9db NB |
1993 | * to allow last call to free memory resources. |
1994 | */ | |
a1d8b49a AG |
1995 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
1996 | if (atomic_read(&cmd->t_transport_timeout) > 1) { | |
1997 | int tmp = (atomic_read(&cmd->t_transport_timeout) - 1); | |
c66ac9db | 1998 | |
a1d8b49a | 1999 | atomic_sub(tmp, &cmd->t_se_count); |
c66ac9db | 2000 | } |
a1d8b49a | 2001 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 2002 | |
e6a2573f | 2003 | transport_put_cmd(cmd); |
c66ac9db NB |
2004 | } |
2005 | ||
c66ac9db NB |
2006 | static inline u32 transport_lba_21(unsigned char *cdb) |
2007 | { | |
2008 | return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3]; | |
2009 | } | |
2010 | ||
2011 | static inline u32 transport_lba_32(unsigned char *cdb) | |
2012 | { | |
2013 | return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; | |
2014 | } | |
2015 | ||
2016 | static inline unsigned long long transport_lba_64(unsigned char *cdb) | |
2017 | { | |
2018 | unsigned int __v1, __v2; | |
2019 | ||
2020 | __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; | |
2021 | __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; | |
2022 | ||
2023 | return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; | |
2024 | } | |
2025 | ||
2026 | /* | |
2027 | * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs | |
2028 | */ | |
2029 | static inline unsigned long long transport_lba_64_ext(unsigned char *cdb) | |
2030 | { | |
2031 | unsigned int __v1, __v2; | |
2032 | ||
2033 | __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15]; | |
2034 | __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19]; | |
2035 | ||
2036 | return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; | |
2037 | } | |
2038 | ||
2039 | static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd) | |
2040 | { | |
2041 | unsigned long flags; | |
2042 | ||
a1d8b49a | 2043 | spin_lock_irqsave(&se_cmd->t_state_lock, flags); |
c66ac9db | 2044 | se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE; |
a1d8b49a | 2045 | spin_unlock_irqrestore(&se_cmd->t_state_lock, flags); |
c66ac9db NB |
2046 | } |
2047 | ||
2048 | /* | |
2049 | * Called from interrupt context. | |
2050 | */ | |
2051 | static void transport_task_timeout_handler(unsigned long data) | |
2052 | { | |
2053 | struct se_task *task = (struct se_task *)data; | |
e3d6f909 | 2054 | struct se_cmd *cmd = task->task_se_cmd; |
c66ac9db NB |
2055 | unsigned long flags; |
2056 | ||
6708bb27 | 2057 | pr_debug("transport task timeout fired! task: %p cmd: %p\n", task, cmd); |
c66ac9db | 2058 | |
a1d8b49a | 2059 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
6c76bf95 | 2060 | if (task->task_flags & TF_TIMER_STOP) { |
a1d8b49a | 2061 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
2062 | return; |
2063 | } | |
6c76bf95 | 2064 | task->task_flags &= ~TF_TIMER_RUNNING; |
c66ac9db NB |
2065 | |
2066 | /* | |
2067 | * Determine if transport_complete_task() has already been called. | |
2068 | */ | |
6c76bf95 CH |
2069 | if (!(task->task_flags & TF_ACTIVE)) { |
2070 | pr_debug("transport task: %p cmd: %p timeout !TF_ACTIVE\n", | |
2071 | task, cmd); | |
a1d8b49a | 2072 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
2073 | return; |
2074 | } | |
2075 | ||
a1d8b49a AG |
2076 | atomic_inc(&cmd->t_se_count); |
2077 | atomic_inc(&cmd->t_transport_timeout); | |
2078 | cmd->t_tasks_failed = 1; | |
c66ac9db | 2079 | |
6c76bf95 | 2080 | task->task_flags |= TF_TIMEOUT; |
c66ac9db NB |
2081 | task->task_error_status = PYX_TRANSPORT_TASK_TIMEOUT; |
2082 | task->task_scsi_status = 1; | |
2083 | ||
6c76bf95 CH |
2084 | if (task->task_flags & TF_REQUEST_STOP) { |
2085 | pr_debug("transport task: %p cmd: %p timeout TF_REQUEST_STOP" | |
c66ac9db | 2086 | " == 1\n", task, cmd); |
a1d8b49a | 2087 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
2088 | complete(&task->task_stop_comp); |
2089 | return; | |
2090 | } | |
2091 | ||
6708bb27 AG |
2092 | if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) { |
2093 | pr_debug("transport task: %p cmd: %p timeout non zero" | |
c66ac9db | 2094 | " t_task_cdbs_left\n", task, cmd); |
a1d8b49a | 2095 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
2096 | return; |
2097 | } | |
6708bb27 | 2098 | pr_debug("transport task: %p cmd: %p timeout ZERO t_task_cdbs_left\n", |
c66ac9db NB |
2099 | task, cmd); |
2100 | ||
2101 | cmd->t_state = TRANSPORT_COMPLETE_FAILURE; | |
a1d8b49a | 2102 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 2103 | |
f7a5cc0b | 2104 | transport_add_cmd_to_queue(cmd, TRANSPORT_COMPLETE_FAILURE, false); |
c66ac9db NB |
2105 | } |
2106 | ||
2107 | /* | |
a1d8b49a | 2108 | * Called with cmd->t_state_lock held. |
c66ac9db NB |
2109 | */ |
2110 | static void transport_start_task_timer(struct se_task *task) | |
2111 | { | |
42bf829e | 2112 | struct se_device *dev = task->task_se_cmd->se_dev; |
c66ac9db NB |
2113 | int timeout; |
2114 | ||
6c76bf95 | 2115 | if (task->task_flags & TF_TIMER_RUNNING) |
c66ac9db NB |
2116 | return; |
2117 | /* | |
2118 | * If the task_timeout is disabled, exit now. | |
2119 | */ | |
e3d6f909 | 2120 | timeout = dev->se_sub_dev->se_dev_attrib.task_timeout; |
6708bb27 | 2121 | if (!timeout) |
c66ac9db NB |
2122 | return; |
2123 | ||
2124 | init_timer(&task->task_timer); | |
2125 | task->task_timer.expires = (get_jiffies_64() + timeout * HZ); | |
2126 | task->task_timer.data = (unsigned long) task; | |
2127 | task->task_timer.function = transport_task_timeout_handler; | |
2128 | ||
6c76bf95 | 2129 | task->task_flags |= TF_TIMER_RUNNING; |
c66ac9db NB |
2130 | add_timer(&task->task_timer); |
2131 | #if 0 | |
6708bb27 | 2132 | pr_debug("Starting task timer for cmd: %p task: %p seconds:" |
c66ac9db NB |
2133 | " %d\n", task->task_se_cmd, task, timeout); |
2134 | #endif | |
2135 | } | |
2136 | ||
2137 | /* | |
a1d8b49a | 2138 | * Called with spin_lock_irq(&cmd->t_state_lock) held. |
c66ac9db NB |
2139 | */ |
2140 | void __transport_stop_task_timer(struct se_task *task, unsigned long *flags) | |
2141 | { | |
e3d6f909 | 2142 | struct se_cmd *cmd = task->task_se_cmd; |
c66ac9db | 2143 | |
6c76bf95 | 2144 | if (!(task->task_flags & TF_TIMER_RUNNING)) |
c66ac9db NB |
2145 | return; |
2146 | ||
6c76bf95 | 2147 | task->task_flags |= TF_TIMER_STOP; |
a1d8b49a | 2148 | spin_unlock_irqrestore(&cmd->t_state_lock, *flags); |
c66ac9db NB |
2149 | |
2150 | del_timer_sync(&task->task_timer); | |
2151 | ||
a1d8b49a | 2152 | spin_lock_irqsave(&cmd->t_state_lock, *flags); |
6c76bf95 CH |
2153 | task->task_flags &= ~TF_TIMER_RUNNING; |
2154 | task->task_flags &= ~TF_TIMER_STOP; | |
c66ac9db NB |
2155 | } |
2156 | ||
2157 | static void transport_stop_all_task_timers(struct se_cmd *cmd) | |
2158 | { | |
2159 | struct se_task *task = NULL, *task_tmp; | |
2160 | unsigned long flags; | |
2161 | ||
a1d8b49a | 2162 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 2163 | list_for_each_entry_safe(task, task_tmp, |
a1d8b49a | 2164 | &cmd->t_task_list, t_list) |
c66ac9db | 2165 | __transport_stop_task_timer(task, &flags); |
a1d8b49a | 2166 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
2167 | } |
2168 | ||
2169 | static inline int transport_tcq_window_closed(struct se_device *dev) | |
2170 | { | |
2171 | if (dev->dev_tcq_window_closed++ < | |
2172 | PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD) { | |
2173 | msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT); | |
2174 | } else | |
2175 | msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG); | |
2176 | ||
e3d6f909 | 2177 | wake_up_interruptible(&dev->dev_queue_obj.thread_wq); |
c66ac9db NB |
2178 | return 0; |
2179 | } | |
2180 | ||
2181 | /* | |
2182 | * Called from Fabric Module context from transport_execute_tasks() | |
2183 | * | |
2184 | * The return of this function determins if the tasks from struct se_cmd | |
2185 | * get added to the execution queue in transport_execute_tasks(), | |
2186 | * or are added to the delayed or ordered lists here. | |
2187 | */ | |
2188 | static inline int transport_execute_task_attr(struct se_cmd *cmd) | |
2189 | { | |
5951146d | 2190 | if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) |
c66ac9db NB |
2191 | return 1; |
2192 | /* | |
25985edc | 2193 | * Check for the existence of HEAD_OF_QUEUE, and if true return 1 |
c66ac9db NB |
2194 | * to allow the passed struct se_cmd list of tasks to the front of the list. |
2195 | */ | |
e66ecd50 | 2196 | if (cmd->sam_task_attr == MSG_HEAD_TAG) { |
5951146d | 2197 | atomic_inc(&cmd->se_dev->dev_hoq_count); |
c66ac9db | 2198 | smp_mb__after_atomic_inc(); |
6708bb27 | 2199 | pr_debug("Added HEAD_OF_QUEUE for CDB:" |
c66ac9db | 2200 | " 0x%02x, se_ordered_id: %u\n", |
6708bb27 | 2201 | cmd->t_task_cdb[0], |
c66ac9db NB |
2202 | cmd->se_ordered_id); |
2203 | return 1; | |
e66ecd50 | 2204 | } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) { |
5951146d AG |
2205 | spin_lock(&cmd->se_dev->ordered_cmd_lock); |
2206 | list_add_tail(&cmd->se_ordered_node, | |
2207 | &cmd->se_dev->ordered_cmd_list); | |
2208 | spin_unlock(&cmd->se_dev->ordered_cmd_lock); | |
c66ac9db | 2209 | |
5951146d | 2210 | atomic_inc(&cmd->se_dev->dev_ordered_sync); |
c66ac9db NB |
2211 | smp_mb__after_atomic_inc(); |
2212 | ||
6708bb27 | 2213 | pr_debug("Added ORDERED for CDB: 0x%02x to ordered" |
c66ac9db | 2214 | " list, se_ordered_id: %u\n", |
a1d8b49a | 2215 | cmd->t_task_cdb[0], |
c66ac9db NB |
2216 | cmd->se_ordered_id); |
2217 | /* | |
2218 | * Add ORDERED command to tail of execution queue if | |
2219 | * no other older commands exist that need to be | |
2220 | * completed first. | |
2221 | */ | |
6708bb27 | 2222 | if (!atomic_read(&cmd->se_dev->simple_cmds)) |
c66ac9db NB |
2223 | return 1; |
2224 | } else { | |
2225 | /* | |
2226 | * For SIMPLE and UNTAGGED Task Attribute commands | |
2227 | */ | |
5951146d | 2228 | atomic_inc(&cmd->se_dev->simple_cmds); |
c66ac9db NB |
2229 | smp_mb__after_atomic_inc(); |
2230 | } | |
2231 | /* | |
2232 | * Otherwise if one or more outstanding ORDERED task attribute exist, | |
2233 | * add the dormant task(s) built for the passed struct se_cmd to the | |
2234 | * execution queue and become in Active state for this struct se_device. | |
2235 | */ | |
5951146d | 2236 | if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) { |
c66ac9db NB |
2237 | /* |
2238 | * Otherwise, add cmd w/ tasks to delayed cmd queue that | |
25985edc | 2239 | * will be drained upon completion of HEAD_OF_QUEUE task. |
c66ac9db | 2240 | */ |
5951146d | 2241 | spin_lock(&cmd->se_dev->delayed_cmd_lock); |
c66ac9db | 2242 | cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR; |
5951146d AG |
2243 | list_add_tail(&cmd->se_delayed_node, |
2244 | &cmd->se_dev->delayed_cmd_list); | |
2245 | spin_unlock(&cmd->se_dev->delayed_cmd_lock); | |
c66ac9db | 2246 | |
6708bb27 | 2247 | pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to" |
c66ac9db | 2248 | " delayed CMD list, se_ordered_id: %u\n", |
a1d8b49a | 2249 | cmd->t_task_cdb[0], cmd->sam_task_attr, |
c66ac9db NB |
2250 | cmd->se_ordered_id); |
2251 | /* | |
2252 | * Return zero to let transport_execute_tasks() know | |
2253 | * not to add the delayed tasks to the execution list. | |
2254 | */ | |
2255 | return 0; | |
2256 | } | |
2257 | /* | |
2258 | * Otherwise, no ORDERED task attributes exist.. | |
2259 | */ | |
2260 | return 1; | |
2261 | } | |
2262 | ||
2263 | /* | |
2264 | * Called from fabric module context in transport_generic_new_cmd() and | |
2265 | * transport_generic_process_write() | |
2266 | */ | |
2267 | static int transport_execute_tasks(struct se_cmd *cmd) | |
2268 | { | |
2269 | int add_tasks; | |
2270 | ||
db1620a2 CH |
2271 | if (se_dev_check_online(cmd->se_orig_obj_ptr) != 0) { |
2272 | cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE; | |
2273 | transport_generic_request_failure(cmd, NULL, 0, 1); | |
2274 | return 0; | |
c66ac9db | 2275 | } |
db1620a2 | 2276 | |
c66ac9db NB |
2277 | /* |
2278 | * Call transport_cmd_check_stop() to see if a fabric exception | |
25985edc | 2279 | * has occurred that prevents execution. |
c66ac9db | 2280 | */ |
6708bb27 | 2281 | if (!transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING)) { |
c66ac9db NB |
2282 | /* |
2283 | * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE | |
2284 | * attribute for the tasks of the received struct se_cmd CDB | |
2285 | */ | |
2286 | add_tasks = transport_execute_task_attr(cmd); | |
e3d6f909 | 2287 | if (!add_tasks) |
c66ac9db NB |
2288 | goto execute_tasks; |
2289 | /* | |
2290 | * This calls transport_add_tasks_from_cmd() to handle | |
2291 | * HEAD_OF_QUEUE ordering for SAM Task Attribute emulation | |
2292 | * (if enabled) in __transport_add_task_to_execute_queue() and | |
2293 | * transport_add_task_check_sam_attr(). | |
2294 | */ | |
2295 | transport_add_tasks_from_cmd(cmd); | |
2296 | } | |
2297 | /* | |
2298 | * Kick the execution queue for the cmd associated struct se_device | |
2299 | * storage object. | |
2300 | */ | |
2301 | execute_tasks: | |
5951146d | 2302 | __transport_execute_tasks(cmd->se_dev); |
c66ac9db NB |
2303 | return 0; |
2304 | } | |
2305 | ||
2306 | /* | |
2307 | * Called to check struct se_device tcq depth window, and once open pull struct se_task | |
2308 | * from struct se_device->execute_task_list and | |
2309 | * | |
2310 | * Called from transport_processing_thread() | |
2311 | */ | |
2312 | static int __transport_execute_tasks(struct se_device *dev) | |
2313 | { | |
2314 | int error; | |
2315 | struct se_cmd *cmd = NULL; | |
e3d6f909 | 2316 | struct se_task *task = NULL; |
c66ac9db NB |
2317 | unsigned long flags; |
2318 | ||
2319 | /* | |
2320 | * Check if there is enough room in the device and HBA queue to send | |
a1d8b49a | 2321 | * struct se_tasks to the selected transport. |
c66ac9db NB |
2322 | */ |
2323 | check_depth: | |
e3d6f909 | 2324 | if (!atomic_read(&dev->depth_left)) |
c66ac9db | 2325 | return transport_tcq_window_closed(dev); |
c66ac9db | 2326 | |
e3d6f909 | 2327 | dev->dev_tcq_window_closed = 0; |
c66ac9db | 2328 | |
e3d6f909 AG |
2329 | spin_lock_irq(&dev->execute_task_lock); |
2330 | if (list_empty(&dev->execute_task_list)) { | |
2331 | spin_unlock_irq(&dev->execute_task_lock); | |
c66ac9db NB |
2332 | return 0; |
2333 | } | |
e3d6f909 AG |
2334 | task = list_first_entry(&dev->execute_task_list, |
2335 | struct se_task, t_execute_list); | |
04629b7b | 2336 | __transport_remove_task_from_execute_queue(task, dev); |
e3d6f909 | 2337 | spin_unlock_irq(&dev->execute_task_lock); |
c66ac9db NB |
2338 | |
2339 | atomic_dec(&dev->depth_left); | |
c66ac9db | 2340 | |
e3d6f909 | 2341 | cmd = task->task_se_cmd; |
c66ac9db | 2342 | |
a1d8b49a | 2343 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
6c76bf95 | 2344 | task->task_flags |= (TF_ACTIVE | TF_SENT); |
a1d8b49a | 2345 | atomic_inc(&cmd->t_task_cdbs_sent); |
c66ac9db | 2346 | |
a1d8b49a AG |
2347 | if (atomic_read(&cmd->t_task_cdbs_sent) == |
2348 | cmd->t_task_list_num) | |
c66ac9db NB |
2349 | atomic_set(&cmd->transport_sent, 1); |
2350 | ||
2351 | transport_start_task_timer(task); | |
a1d8b49a | 2352 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
2353 | /* |
2354 | * The struct se_cmd->transport_emulate_cdb() function pointer is used | |
e3d6f909 | 2355 | * to grab REPORT_LUNS and other CDBs we want to handle before they hit the |
c66ac9db NB |
2356 | * struct se_subsystem_api->do_task() caller below. |
2357 | */ | |
2358 | if (cmd->transport_emulate_cdb) { | |
2359 | error = cmd->transport_emulate_cdb(cmd); | |
2360 | if (error != 0) { | |
2361 | cmd->transport_error_status = error; | |
6c76bf95 CH |
2362 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
2363 | task->task_flags &= ~TF_ACTIVE; | |
2364 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
c66ac9db NB |
2365 | atomic_set(&cmd->transport_sent, 0); |
2366 | transport_stop_tasks_for_cmd(cmd); | |
2367 | transport_generic_request_failure(cmd, dev, 0, 1); | |
2368 | goto check_depth; | |
2369 | } | |
2370 | /* | |
2371 | * Handle the successful completion for transport_emulate_cdb() | |
2372 | * for synchronous operation, following SCF_EMULATE_CDB_ASYNC | |
2373 | * Otherwise the caller is expected to complete the task with | |
2374 | * proper status. | |
2375 | */ | |
2376 | if (!(cmd->se_cmd_flags & SCF_EMULATE_CDB_ASYNC)) { | |
2377 | cmd->scsi_status = SAM_STAT_GOOD; | |
2378 | task->task_scsi_status = GOOD; | |
2379 | transport_complete_task(task, 1); | |
2380 | } | |
2381 | } else { | |
2382 | /* | |
2383 | * Currently for all virtual TCM plugins including IBLOCK, FILEIO and | |
2384 | * RAMDISK we use the internal transport_emulate_control_cdb() logic | |
2385 | * with struct se_subsystem_api callers for the primary SPC-3 TYPE_DISK | |
2386 | * LUN emulation code. | |
2387 | * | |
2388 | * For TCM/pSCSI and all other SCF_SCSI_DATA_SG_IO_CDB I/O tasks we | |
2389 | * call ->do_task() directly and let the underlying TCM subsystem plugin | |
2390 | * code handle the CDB emulation. | |
2391 | */ | |
e3d6f909 AG |
2392 | if ((dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) && |
2393 | (!(task->task_se_cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB))) | |
c66ac9db NB |
2394 | error = transport_emulate_control_cdb(task); |
2395 | else | |
e3d6f909 | 2396 | error = dev->transport->do_task(task); |
c66ac9db NB |
2397 | |
2398 | if (error != 0) { | |
2399 | cmd->transport_error_status = error; | |
6c76bf95 CH |
2400 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
2401 | task->task_flags &= ~TF_ACTIVE; | |
2402 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
c66ac9db NB |
2403 | atomic_set(&cmd->transport_sent, 0); |
2404 | transport_stop_tasks_for_cmd(cmd); | |
2405 | transport_generic_request_failure(cmd, dev, 0, 1); | |
2406 | } | |
2407 | } | |
2408 | ||
2409 | goto check_depth; | |
2410 | ||
2411 | return 0; | |
2412 | } | |
2413 | ||
2414 | void transport_new_cmd_failure(struct se_cmd *se_cmd) | |
2415 | { | |
2416 | unsigned long flags; | |
2417 | /* | |
2418 | * Any unsolicited data will get dumped for failed command inside of | |
2419 | * the fabric plugin | |
2420 | */ | |
a1d8b49a | 2421 | spin_lock_irqsave(&se_cmd->t_state_lock, flags); |
c66ac9db NB |
2422 | se_cmd->se_cmd_flags |= SCF_SE_CMD_FAILED; |
2423 | se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
a1d8b49a | 2424 | spin_unlock_irqrestore(&se_cmd->t_state_lock, flags); |
c66ac9db NB |
2425 | } |
2426 | ||
c66ac9db NB |
2427 | static inline u32 transport_get_sectors_6( |
2428 | unsigned char *cdb, | |
2429 | struct se_cmd *cmd, | |
2430 | int *ret) | |
2431 | { | |
5951146d | 2432 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
2433 | |
2434 | /* | |
2435 | * Assume TYPE_DISK for non struct se_device objects. | |
2436 | * Use 8-bit sector value. | |
2437 | */ | |
2438 | if (!dev) | |
2439 | goto type_disk; | |
2440 | ||
2441 | /* | |
2442 | * Use 24-bit allocation length for TYPE_TAPE. | |
2443 | */ | |
e3d6f909 | 2444 | if (dev->transport->get_device_type(dev) == TYPE_TAPE) |
c66ac9db NB |
2445 | return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4]; |
2446 | ||
2447 | /* | |
2448 | * Everything else assume TYPE_DISK Sector CDB location. | |
2449 | * Use 8-bit sector value. | |
2450 | */ | |
2451 | type_disk: | |
2452 | return (u32)cdb[4]; | |
2453 | } | |
2454 | ||
2455 | static inline u32 transport_get_sectors_10( | |
2456 | unsigned char *cdb, | |
2457 | struct se_cmd *cmd, | |
2458 | int *ret) | |
2459 | { | |
5951146d | 2460 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
2461 | |
2462 | /* | |
2463 | * Assume TYPE_DISK for non struct se_device objects. | |
2464 | * Use 16-bit sector value. | |
2465 | */ | |
2466 | if (!dev) | |
2467 | goto type_disk; | |
2468 | ||
2469 | /* | |
2470 | * XXX_10 is not defined in SSC, throw an exception | |
2471 | */ | |
e3d6f909 AG |
2472 | if (dev->transport->get_device_type(dev) == TYPE_TAPE) { |
2473 | *ret = -EINVAL; | |
c66ac9db NB |
2474 | return 0; |
2475 | } | |
2476 | ||
2477 | /* | |
2478 | * Everything else assume TYPE_DISK Sector CDB location. | |
2479 | * Use 16-bit sector value. | |
2480 | */ | |
2481 | type_disk: | |
2482 | return (u32)(cdb[7] << 8) + cdb[8]; | |
2483 | } | |
2484 | ||
2485 | static inline u32 transport_get_sectors_12( | |
2486 | unsigned char *cdb, | |
2487 | struct se_cmd *cmd, | |
2488 | int *ret) | |
2489 | { | |
5951146d | 2490 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
2491 | |
2492 | /* | |
2493 | * Assume TYPE_DISK for non struct se_device objects. | |
2494 | * Use 32-bit sector value. | |
2495 | */ | |
2496 | if (!dev) | |
2497 | goto type_disk; | |
2498 | ||
2499 | /* | |
2500 | * XXX_12 is not defined in SSC, throw an exception | |
2501 | */ | |
e3d6f909 AG |
2502 | if (dev->transport->get_device_type(dev) == TYPE_TAPE) { |
2503 | *ret = -EINVAL; | |
c66ac9db NB |
2504 | return 0; |
2505 | } | |
2506 | ||
2507 | /* | |
2508 | * Everything else assume TYPE_DISK Sector CDB location. | |
2509 | * Use 32-bit sector value. | |
2510 | */ | |
2511 | type_disk: | |
2512 | return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9]; | |
2513 | } | |
2514 | ||
2515 | static inline u32 transport_get_sectors_16( | |
2516 | unsigned char *cdb, | |
2517 | struct se_cmd *cmd, | |
2518 | int *ret) | |
2519 | { | |
5951146d | 2520 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
2521 | |
2522 | /* | |
2523 | * Assume TYPE_DISK for non struct se_device objects. | |
2524 | * Use 32-bit sector value. | |
2525 | */ | |
2526 | if (!dev) | |
2527 | goto type_disk; | |
2528 | ||
2529 | /* | |
2530 | * Use 24-bit allocation length for TYPE_TAPE. | |
2531 | */ | |
e3d6f909 | 2532 | if (dev->transport->get_device_type(dev) == TYPE_TAPE) |
c66ac9db NB |
2533 | return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14]; |
2534 | ||
2535 | type_disk: | |
2536 | return (u32)(cdb[10] << 24) + (cdb[11] << 16) + | |
2537 | (cdb[12] << 8) + cdb[13]; | |
2538 | } | |
2539 | ||
2540 | /* | |
2541 | * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants | |
2542 | */ | |
2543 | static inline u32 transport_get_sectors_32( | |
2544 | unsigned char *cdb, | |
2545 | struct se_cmd *cmd, | |
2546 | int *ret) | |
2547 | { | |
2548 | /* | |
2549 | * Assume TYPE_DISK for non struct se_device objects. | |
2550 | * Use 32-bit sector value. | |
2551 | */ | |
2552 | return (u32)(cdb[28] << 24) + (cdb[29] << 16) + | |
2553 | (cdb[30] << 8) + cdb[31]; | |
2554 | ||
2555 | } | |
2556 | ||
2557 | static inline u32 transport_get_size( | |
2558 | u32 sectors, | |
2559 | unsigned char *cdb, | |
2560 | struct se_cmd *cmd) | |
2561 | { | |
5951146d | 2562 | struct se_device *dev = cmd->se_dev; |
c66ac9db | 2563 | |
e3d6f909 | 2564 | if (dev->transport->get_device_type(dev) == TYPE_TAPE) { |
c66ac9db | 2565 | if (cdb[1] & 1) { /* sectors */ |
e3d6f909 | 2566 | return dev->se_sub_dev->se_dev_attrib.block_size * sectors; |
c66ac9db NB |
2567 | } else /* bytes */ |
2568 | return sectors; | |
2569 | } | |
2570 | #if 0 | |
6708bb27 | 2571 | pr_debug("Returning block_size: %u, sectors: %u == %u for" |
e3d6f909 AG |
2572 | " %s object\n", dev->se_sub_dev->se_dev_attrib.block_size, sectors, |
2573 | dev->se_sub_dev->se_dev_attrib.block_size * sectors, | |
2574 | dev->transport->name); | |
c66ac9db | 2575 | #endif |
e3d6f909 | 2576 | return dev->se_sub_dev->se_dev_attrib.block_size * sectors; |
c66ac9db NB |
2577 | } |
2578 | ||
c66ac9db NB |
2579 | static void transport_xor_callback(struct se_cmd *cmd) |
2580 | { | |
2581 | unsigned char *buf, *addr; | |
ec98f782 | 2582 | struct scatterlist *sg; |
c66ac9db NB |
2583 | unsigned int offset; |
2584 | int i; | |
ec98f782 | 2585 | int count; |
c66ac9db NB |
2586 | /* |
2587 | * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command | |
2588 | * | |
2589 | * 1) read the specified logical block(s); | |
2590 | * 2) transfer logical blocks from the data-out buffer; | |
2591 | * 3) XOR the logical blocks transferred from the data-out buffer with | |
2592 | * the logical blocks read, storing the resulting XOR data in a buffer; | |
2593 | * 4) if the DISABLE WRITE bit is set to zero, then write the logical | |
2594 | * blocks transferred from the data-out buffer; and | |
2595 | * 5) transfer the resulting XOR data to the data-in buffer. | |
2596 | */ | |
2597 | buf = kmalloc(cmd->data_length, GFP_KERNEL); | |
6708bb27 AG |
2598 | if (!buf) { |
2599 | pr_err("Unable to allocate xor_callback buf\n"); | |
c66ac9db NB |
2600 | return; |
2601 | } | |
2602 | /* | |
ec98f782 | 2603 | * Copy the scatterlist WRITE buffer located at cmd->t_data_sg |
c66ac9db NB |
2604 | * into the locally allocated *buf |
2605 | */ | |
ec98f782 AG |
2606 | sg_copy_to_buffer(cmd->t_data_sg, |
2607 | cmd->t_data_nents, | |
2608 | buf, | |
2609 | cmd->data_length); | |
2610 | ||
c66ac9db NB |
2611 | /* |
2612 | * Now perform the XOR against the BIDI read memory located at | |
a1d8b49a | 2613 | * cmd->t_mem_bidi_list |
c66ac9db NB |
2614 | */ |
2615 | ||
2616 | offset = 0; | |
ec98f782 AG |
2617 | for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) { |
2618 | addr = kmap_atomic(sg_page(sg), KM_USER0); | |
2619 | if (!addr) | |
c66ac9db NB |
2620 | goto out; |
2621 | ||
ec98f782 AG |
2622 | for (i = 0; i < sg->length; i++) |
2623 | *(addr + sg->offset + i) ^= *(buf + offset + i); | |
c66ac9db | 2624 | |
ec98f782 | 2625 | offset += sg->length; |
c66ac9db NB |
2626 | kunmap_atomic(addr, KM_USER0); |
2627 | } | |
ec98f782 | 2628 | |
c66ac9db NB |
2629 | out: |
2630 | kfree(buf); | |
2631 | } | |
2632 | ||
2633 | /* | |
2634 | * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd | |
2635 | */ | |
2636 | static int transport_get_sense_data(struct se_cmd *cmd) | |
2637 | { | |
2638 | unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL; | |
42bf829e | 2639 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
2640 | struct se_task *task = NULL, *task_tmp; |
2641 | unsigned long flags; | |
2642 | u32 offset = 0; | |
2643 | ||
e3d6f909 AG |
2644 | WARN_ON(!cmd->se_lun); |
2645 | ||
42bf829e CH |
2646 | if (!dev) |
2647 | return 0; | |
2648 | ||
a1d8b49a | 2649 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 2650 | if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) { |
a1d8b49a | 2651 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
2652 | return 0; |
2653 | } | |
2654 | ||
2655 | list_for_each_entry_safe(task, task_tmp, | |
a1d8b49a | 2656 | &cmd->t_task_list, t_list) { |
c66ac9db NB |
2657 | if (!task->task_sense) |
2658 | continue; | |
2659 | ||
e3d6f909 | 2660 | if (!dev->transport->get_sense_buffer) { |
6708bb27 | 2661 | pr_err("dev->transport->get_sense_buffer" |
c66ac9db NB |
2662 | " is NULL\n"); |
2663 | continue; | |
2664 | } | |
2665 | ||
e3d6f909 | 2666 | sense_buffer = dev->transport->get_sense_buffer(task); |
6708bb27 | 2667 | if (!sense_buffer) { |
04629b7b | 2668 | pr_err("ITT[0x%08x]_TASK[%p]: Unable to locate" |
c66ac9db | 2669 | " sense buffer for task with sense\n", |
04629b7b | 2670 | cmd->se_tfo->get_task_tag(cmd), task); |
c66ac9db NB |
2671 | continue; |
2672 | } | |
a1d8b49a | 2673 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 2674 | |
e3d6f909 | 2675 | offset = cmd->se_tfo->set_fabric_sense_len(cmd, |
c66ac9db NB |
2676 | TRANSPORT_SENSE_BUFFER); |
2677 | ||
5951146d | 2678 | memcpy(&buffer[offset], sense_buffer, |
c66ac9db NB |
2679 | TRANSPORT_SENSE_BUFFER); |
2680 | cmd->scsi_status = task->task_scsi_status; | |
2681 | /* Automatically padded */ | |
2682 | cmd->scsi_sense_length = | |
2683 | (TRANSPORT_SENSE_BUFFER + offset); | |
2684 | ||
6708bb27 | 2685 | pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x" |
c66ac9db | 2686 | " and sense\n", |
e3d6f909 | 2687 | dev->se_hba->hba_id, dev->transport->name, |
c66ac9db NB |
2688 | cmd->scsi_status); |
2689 | return 0; | |
2690 | } | |
a1d8b49a | 2691 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
2692 | |
2693 | return -1; | |
2694 | } | |
2695 | ||
c66ac9db NB |
2696 | static int |
2697 | transport_handle_reservation_conflict(struct se_cmd *cmd) | |
2698 | { | |
c66ac9db NB |
2699 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; |
2700 | cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT; | |
2701 | cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT; | |
2702 | /* | |
2703 | * For UA Interlock Code 11b, a RESERVATION CONFLICT will | |
2704 | * establish a UNIT ATTENTION with PREVIOUS RESERVATION | |
2705 | * CONFLICT STATUS. | |
2706 | * | |
2707 | * See spc4r17, section 7.4.6 Control Mode Page, Table 349 | |
2708 | */ | |
e3d6f909 AG |
2709 | if (cmd->se_sess && |
2710 | cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2) | |
2711 | core_scsi3_ua_allocate(cmd->se_sess->se_node_acl, | |
c66ac9db NB |
2712 | cmd->orig_fe_lun, 0x2C, |
2713 | ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS); | |
5951146d | 2714 | return -EINVAL; |
c66ac9db NB |
2715 | } |
2716 | ||
ec98f782 AG |
2717 | static inline long long transport_dev_end_lba(struct se_device *dev) |
2718 | { | |
2719 | return dev->transport->get_blocks(dev) + 1; | |
2720 | } | |
2721 | ||
2722 | static int transport_cmd_get_valid_sectors(struct se_cmd *cmd) | |
2723 | { | |
2724 | struct se_device *dev = cmd->se_dev; | |
2725 | u32 sectors; | |
2726 | ||
2727 | if (dev->transport->get_device_type(dev) != TYPE_DISK) | |
2728 | return 0; | |
2729 | ||
2730 | sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size); | |
2731 | ||
6708bb27 AG |
2732 | if ((cmd->t_task_lba + sectors) > transport_dev_end_lba(dev)) { |
2733 | pr_err("LBA: %llu Sectors: %u exceeds" | |
ec98f782 AG |
2734 | " transport_dev_end_lba(): %llu\n", |
2735 | cmd->t_task_lba, sectors, | |
2736 | transport_dev_end_lba(dev)); | |
7abbe7f3 | 2737 | return -EINVAL; |
ec98f782 AG |
2738 | } |
2739 | ||
7abbe7f3 | 2740 | return 0; |
ec98f782 AG |
2741 | } |
2742 | ||
706d5860 NB |
2743 | static int target_check_write_same_discard(unsigned char *flags, struct se_device *dev) |
2744 | { | |
2745 | /* | |
2746 | * Determine if the received WRITE_SAME is used to for direct | |
2747 | * passthrough into Linux/SCSI with struct request via TCM/pSCSI | |
2748 | * or we are signaling the use of internal WRITE_SAME + UNMAP=1 | |
2749 | * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code. | |
2750 | */ | |
2751 | int passthrough = (dev->transport->transport_type == | |
2752 | TRANSPORT_PLUGIN_PHBA_PDEV); | |
2753 | ||
2754 | if (!passthrough) { | |
2755 | if ((flags[0] & 0x04) || (flags[0] & 0x02)) { | |
2756 | pr_err("WRITE_SAME PBDATA and LBDATA" | |
2757 | " bits not supported for Block Discard" | |
2758 | " Emulation\n"); | |
2759 | return -ENOSYS; | |
2760 | } | |
2761 | /* | |
2762 | * Currently for the emulated case we only accept | |
2763 | * tpws with the UNMAP=1 bit set. | |
2764 | */ | |
2765 | if (!(flags[0] & 0x08)) { | |
2766 | pr_err("WRITE_SAME w/o UNMAP bit not" | |
2767 | " supported for Block Discard Emulation\n"); | |
2768 | return -ENOSYS; | |
2769 | } | |
2770 | } | |
2771 | ||
2772 | return 0; | |
2773 | } | |
2774 | ||
c66ac9db NB |
2775 | /* transport_generic_cmd_sequencer(): |
2776 | * | |
2777 | * Generic Command Sequencer that should work for most DAS transport | |
2778 | * drivers. | |
2779 | * | |
2780 | * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD | |
2781 | * RX Thread. | |
2782 | * | |
2783 | * FIXME: Need to support other SCSI OPCODES where as well. | |
2784 | */ | |
2785 | static int transport_generic_cmd_sequencer( | |
2786 | struct se_cmd *cmd, | |
2787 | unsigned char *cdb) | |
2788 | { | |
5951146d | 2789 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
2790 | struct se_subsystem_dev *su_dev = dev->se_sub_dev; |
2791 | int ret = 0, sector_ret = 0, passthrough; | |
2792 | u32 sectors = 0, size = 0, pr_reg_type = 0; | |
2793 | u16 service_action; | |
2794 | u8 alua_ascq = 0; | |
2795 | /* | |
2796 | * Check for an existing UNIT ATTENTION condition | |
2797 | */ | |
2798 | if (core_scsi3_ua_check(cmd, cdb) < 0) { | |
c66ac9db NB |
2799 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; |
2800 | cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION; | |
5951146d | 2801 | return -EINVAL; |
c66ac9db NB |
2802 | } |
2803 | /* | |
2804 | * Check status of Asymmetric Logical Unit Assignment port | |
2805 | */ | |
e3d6f909 | 2806 | ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq); |
c66ac9db | 2807 | if (ret != 0) { |
c66ac9db | 2808 | /* |
25985edc | 2809 | * Set SCSI additional sense code (ASC) to 'LUN Not Accessible'; |
c66ac9db NB |
2810 | * The ALUA additional sense code qualifier (ASCQ) is determined |
2811 | * by the ALUA primary or secondary access state.. | |
2812 | */ | |
2813 | if (ret > 0) { | |
2814 | #if 0 | |
6708bb27 | 2815 | pr_debug("[%s]: ALUA TG Port not available," |
c66ac9db | 2816 | " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n", |
e3d6f909 | 2817 | cmd->se_tfo->get_fabric_name(), alua_ascq); |
c66ac9db NB |
2818 | #endif |
2819 | transport_set_sense_codes(cmd, 0x04, alua_ascq); | |
2820 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
2821 | cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY; | |
5951146d | 2822 | return -EINVAL; |
c66ac9db NB |
2823 | } |
2824 | goto out_invalid_cdb_field; | |
2825 | } | |
2826 | /* | |
2827 | * Check status for SPC-3 Persistent Reservations | |
2828 | */ | |
e3d6f909 AG |
2829 | if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type) != 0) { |
2830 | if (su_dev->t10_pr.pr_ops.t10_seq_non_holder( | |
c66ac9db NB |
2831 | cmd, cdb, pr_reg_type) != 0) |
2832 | return transport_handle_reservation_conflict(cmd); | |
2833 | /* | |
2834 | * This means the CDB is allowed for the SCSI Initiator port | |
2835 | * when said port is *NOT* holding the legacy SPC-2 or | |
2836 | * SPC-3 Persistent Reservation. | |
2837 | */ | |
2838 | } | |
2839 | ||
2840 | switch (cdb[0]) { | |
2841 | case READ_6: | |
2842 | sectors = transport_get_sectors_6(cdb, cmd, §or_ret); | |
2843 | if (sector_ret) | |
2844 | goto out_unsupported_cdb; | |
2845 | size = transport_get_size(sectors, cdb, cmd); | |
a1d8b49a | 2846 | cmd->t_task_lba = transport_lba_21(cdb); |
c66ac9db NB |
2847 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2848 | break; | |
2849 | case READ_10: | |
2850 | sectors = transport_get_sectors_10(cdb, cmd, §or_ret); | |
2851 | if (sector_ret) | |
2852 | goto out_unsupported_cdb; | |
2853 | size = transport_get_size(sectors, cdb, cmd); | |
a1d8b49a | 2854 | cmd->t_task_lba = transport_lba_32(cdb); |
c66ac9db NB |
2855 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2856 | break; | |
2857 | case READ_12: | |
2858 | sectors = transport_get_sectors_12(cdb, cmd, §or_ret); | |
2859 | if (sector_ret) | |
2860 | goto out_unsupported_cdb; | |
2861 | size = transport_get_size(sectors, cdb, cmd); | |
a1d8b49a | 2862 | cmd->t_task_lba = transport_lba_32(cdb); |
c66ac9db NB |
2863 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2864 | break; | |
2865 | case READ_16: | |
2866 | sectors = transport_get_sectors_16(cdb, cmd, §or_ret); | |
2867 | if (sector_ret) | |
2868 | goto out_unsupported_cdb; | |
2869 | size = transport_get_size(sectors, cdb, cmd); | |
a1d8b49a | 2870 | cmd->t_task_lba = transport_lba_64(cdb); |
c66ac9db NB |
2871 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2872 | break; | |
2873 | case WRITE_6: | |
2874 | sectors = transport_get_sectors_6(cdb, cmd, §or_ret); | |
2875 | if (sector_ret) | |
2876 | goto out_unsupported_cdb; | |
2877 | size = transport_get_size(sectors, cdb, cmd); | |
a1d8b49a | 2878 | cmd->t_task_lba = transport_lba_21(cdb); |
c66ac9db NB |
2879 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2880 | break; | |
2881 | case WRITE_10: | |
2882 | sectors = transport_get_sectors_10(cdb, cmd, §or_ret); | |
2883 | if (sector_ret) | |
2884 | goto out_unsupported_cdb; | |
2885 | size = transport_get_size(sectors, cdb, cmd); | |
a1d8b49a AG |
2886 | cmd->t_task_lba = transport_lba_32(cdb); |
2887 | cmd->t_tasks_fua = (cdb[1] & 0x8); | |
c66ac9db NB |
2888 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2889 | break; | |
2890 | case WRITE_12: | |
2891 | sectors = transport_get_sectors_12(cdb, cmd, §or_ret); | |
2892 | if (sector_ret) | |
2893 | goto out_unsupported_cdb; | |
2894 | size = transport_get_size(sectors, cdb, cmd); | |
a1d8b49a AG |
2895 | cmd->t_task_lba = transport_lba_32(cdb); |
2896 | cmd->t_tasks_fua = (cdb[1] & 0x8); | |
c66ac9db NB |
2897 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2898 | break; | |
2899 | case WRITE_16: | |
2900 | sectors = transport_get_sectors_16(cdb, cmd, §or_ret); | |
2901 | if (sector_ret) | |
2902 | goto out_unsupported_cdb; | |
2903 | size = transport_get_size(sectors, cdb, cmd); | |
a1d8b49a AG |
2904 | cmd->t_task_lba = transport_lba_64(cdb); |
2905 | cmd->t_tasks_fua = (cdb[1] & 0x8); | |
c66ac9db NB |
2906 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2907 | break; | |
2908 | case XDWRITEREAD_10: | |
2909 | if ((cmd->data_direction != DMA_TO_DEVICE) || | |
a1d8b49a | 2910 | !(cmd->t_tasks_bidi)) |
c66ac9db NB |
2911 | goto out_invalid_cdb_field; |
2912 | sectors = transport_get_sectors_10(cdb, cmd, §or_ret); | |
2913 | if (sector_ret) | |
2914 | goto out_unsupported_cdb; | |
2915 | size = transport_get_size(sectors, cdb, cmd); | |
a1d8b49a | 2916 | cmd->t_task_lba = transport_lba_32(cdb); |
c66ac9db | 2917 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
e3d6f909 | 2918 | passthrough = (dev->transport->transport_type == |
c66ac9db NB |
2919 | TRANSPORT_PLUGIN_PHBA_PDEV); |
2920 | /* | |
2921 | * Skip the remaining assignments for TCM/PSCSI passthrough | |
2922 | */ | |
2923 | if (passthrough) | |
2924 | break; | |
2925 | /* | |
2926 | * Setup BIDI XOR callback to be run during transport_generic_complete_ok() | |
2927 | */ | |
2928 | cmd->transport_complete_callback = &transport_xor_callback; | |
a1d8b49a | 2929 | cmd->t_tasks_fua = (cdb[1] & 0x8); |
c66ac9db NB |
2930 | break; |
2931 | case VARIABLE_LENGTH_CMD: | |
2932 | service_action = get_unaligned_be16(&cdb[8]); | |
2933 | /* | |
2934 | * Determine if this is TCM/PSCSI device and we should disable | |
2935 | * internal emulation for this CDB. | |
2936 | */ | |
e3d6f909 | 2937 | passthrough = (dev->transport->transport_type == |
c66ac9db NB |
2938 | TRANSPORT_PLUGIN_PHBA_PDEV); |
2939 | ||
2940 | switch (service_action) { | |
2941 | case XDWRITEREAD_32: | |
2942 | sectors = transport_get_sectors_32(cdb, cmd, §or_ret); | |
2943 | if (sector_ret) | |
2944 | goto out_unsupported_cdb; | |
2945 | size = transport_get_size(sectors, cdb, cmd); | |
2946 | /* | |
2947 | * Use WRITE_32 and READ_32 opcodes for the emulated | |
2948 | * XDWRITE_READ_32 logic. | |
2949 | */ | |
a1d8b49a | 2950 | cmd->t_task_lba = transport_lba_64_ext(cdb); |
c66ac9db NB |
2951 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2952 | ||
2953 | /* | |
2954 | * Skip the remaining assignments for TCM/PSCSI passthrough | |
2955 | */ | |
2956 | if (passthrough) | |
2957 | break; | |
2958 | ||
2959 | /* | |
2960 | * Setup BIDI XOR callback to be run during | |
2961 | * transport_generic_complete_ok() | |
2962 | */ | |
2963 | cmd->transport_complete_callback = &transport_xor_callback; | |
a1d8b49a | 2964 | cmd->t_tasks_fua = (cdb[10] & 0x8); |
c66ac9db NB |
2965 | break; |
2966 | case WRITE_SAME_32: | |
2967 | sectors = transport_get_sectors_32(cdb, cmd, §or_ret); | |
2968 | if (sector_ret) | |
2969 | goto out_unsupported_cdb; | |
dd3a5ad8 | 2970 | |
6708bb27 | 2971 | if (sectors) |
12850626 | 2972 | size = transport_get_size(1, cdb, cmd); |
6708bb27 AG |
2973 | else { |
2974 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not" | |
2975 | " supported\n"); | |
2976 | goto out_invalid_cdb_field; | |
2977 | } | |
dd3a5ad8 | 2978 | |
a1d8b49a | 2979 | cmd->t_task_lba = get_unaligned_be64(&cdb[12]); |
c66ac9db NB |
2980 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
2981 | ||
706d5860 | 2982 | if (target_check_write_same_discard(&cdb[10], dev) < 0) |
c66ac9db | 2983 | goto out_invalid_cdb_field; |
706d5860 | 2984 | |
c66ac9db NB |
2985 | break; |
2986 | default: | |
6708bb27 | 2987 | pr_err("VARIABLE_LENGTH_CMD service action" |
c66ac9db NB |
2988 | " 0x%04x not supported\n", service_action); |
2989 | goto out_unsupported_cdb; | |
2990 | } | |
2991 | break; | |
e434f1f1 | 2992 | case MAINTENANCE_IN: |
e3d6f909 | 2993 | if (dev->transport->get_device_type(dev) != TYPE_ROM) { |
c66ac9db NB |
2994 | /* MAINTENANCE_IN from SCC-2 */ |
2995 | /* | |
2996 | * Check for emulated MI_REPORT_TARGET_PGS. | |
2997 | */ | |
2998 | if (cdb[1] == MI_REPORT_TARGET_PGS) { | |
2999 | cmd->transport_emulate_cdb = | |
e3d6f909 | 3000 | (su_dev->t10_alua.alua_type == |
c66ac9db | 3001 | SPC3_ALUA_EMULATED) ? |
e3d6f909 | 3002 | core_emulate_report_target_port_groups : |
c66ac9db NB |
3003 | NULL; |
3004 | } | |
3005 | size = (cdb[6] << 24) | (cdb[7] << 16) | | |
3006 | (cdb[8] << 8) | cdb[9]; | |
3007 | } else { | |
3008 | /* GPCMD_SEND_KEY from multi media commands */ | |
3009 | size = (cdb[8] << 8) + cdb[9]; | |
3010 | } | |
05d1c7c0 | 3011 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
3012 | break; |
3013 | case MODE_SELECT: | |
3014 | size = cdb[4]; | |
3015 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; | |
3016 | break; | |
3017 | case MODE_SELECT_10: | |
3018 | size = (cdb[7] << 8) + cdb[8]; | |
3019 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; | |
3020 | break; | |
3021 | case MODE_SENSE: | |
3022 | size = cdb[4]; | |
05d1c7c0 | 3023 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
3024 | break; |
3025 | case MODE_SENSE_10: | |
3026 | case GPCMD_READ_BUFFER_CAPACITY: | |
3027 | case GPCMD_SEND_OPC: | |
3028 | case LOG_SELECT: | |
3029 | case LOG_SENSE: | |
3030 | size = (cdb[7] << 8) + cdb[8]; | |
05d1c7c0 | 3031 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
3032 | break; |
3033 | case READ_BLOCK_LIMITS: | |
3034 | size = READ_BLOCK_LEN; | |
05d1c7c0 | 3035 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
3036 | break; |
3037 | case GPCMD_GET_CONFIGURATION: | |
3038 | case GPCMD_READ_FORMAT_CAPACITIES: | |
3039 | case GPCMD_READ_DISC_INFO: | |
3040 | case GPCMD_READ_TRACK_RZONE_INFO: | |
3041 | size = (cdb[7] << 8) + cdb[8]; | |
3042 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; | |
3043 | break; | |
3044 | case PERSISTENT_RESERVE_IN: | |
3045 | case PERSISTENT_RESERVE_OUT: | |
3046 | cmd->transport_emulate_cdb = | |
e3d6f909 | 3047 | (su_dev->t10_pr.res_type == |
c66ac9db | 3048 | SPC3_PERSISTENT_RESERVATIONS) ? |
e3d6f909 | 3049 | core_scsi3_emulate_pr : NULL; |
c66ac9db | 3050 | size = (cdb[7] << 8) + cdb[8]; |
05d1c7c0 | 3051 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
3052 | break; |
3053 | case GPCMD_MECHANISM_STATUS: | |
3054 | case GPCMD_READ_DVD_STRUCTURE: | |
3055 | size = (cdb[8] << 8) + cdb[9]; | |
3056 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; | |
3057 | break; | |
3058 | case READ_POSITION: | |
3059 | size = READ_POSITION_LEN; | |
05d1c7c0 | 3060 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db | 3061 | break; |
e434f1f1 | 3062 | case MAINTENANCE_OUT: |
e3d6f909 | 3063 | if (dev->transport->get_device_type(dev) != TYPE_ROM) { |
c66ac9db NB |
3064 | /* MAINTENANCE_OUT from SCC-2 |
3065 | * | |
3066 | * Check for emulated MO_SET_TARGET_PGS. | |
3067 | */ | |
3068 | if (cdb[1] == MO_SET_TARGET_PGS) { | |
3069 | cmd->transport_emulate_cdb = | |
e3d6f909 | 3070 | (su_dev->t10_alua.alua_type == |
c66ac9db | 3071 | SPC3_ALUA_EMULATED) ? |
e3d6f909 | 3072 | core_emulate_set_target_port_groups : |
c66ac9db NB |
3073 | NULL; |
3074 | } | |
3075 | ||
3076 | size = (cdb[6] << 24) | (cdb[7] << 16) | | |
3077 | (cdb[8] << 8) | cdb[9]; | |
3078 | } else { | |
3079 | /* GPCMD_REPORT_KEY from multi media commands */ | |
3080 | size = (cdb[8] << 8) + cdb[9]; | |
3081 | } | |
05d1c7c0 | 3082 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
3083 | break; |
3084 | case INQUIRY: | |
3085 | size = (cdb[3] << 8) + cdb[4]; | |
3086 | /* | |
3087 | * Do implict HEAD_OF_QUEUE processing for INQUIRY. | |
3088 | * See spc4r17 section 5.3 | |
3089 | */ | |
5951146d | 3090 | if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) |
e66ecd50 | 3091 | cmd->sam_task_attr = MSG_HEAD_TAG; |
05d1c7c0 | 3092 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
3093 | break; |
3094 | case READ_BUFFER: | |
3095 | size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8]; | |
05d1c7c0 | 3096 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
3097 | break; |
3098 | case READ_CAPACITY: | |
3099 | size = READ_CAP_LEN; | |
05d1c7c0 | 3100 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
3101 | break; |
3102 | case READ_MEDIA_SERIAL_NUMBER: | |
3103 | case SECURITY_PROTOCOL_IN: | |
3104 | case SECURITY_PROTOCOL_OUT: | |
3105 | size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; | |
05d1c7c0 | 3106 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
3107 | break; |
3108 | case SERVICE_ACTION_IN: | |
3109 | case ACCESS_CONTROL_IN: | |
3110 | case ACCESS_CONTROL_OUT: | |
3111 | case EXTENDED_COPY: | |
3112 | case READ_ATTRIBUTE: | |
3113 | case RECEIVE_COPY_RESULTS: | |
3114 | case WRITE_ATTRIBUTE: | |
3115 | size = (cdb[10] << 24) | (cdb[11] << 16) | | |
3116 | (cdb[12] << 8) | cdb[13]; | |
05d1c7c0 | 3117 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
3118 | break; |
3119 | case RECEIVE_DIAGNOSTIC: | |
3120 | case SEND_DIAGNOSTIC: | |
3121 | size = (cdb[3] << 8) | cdb[4]; | |
05d1c7c0 | 3122 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
3123 | break; |
3124 | /* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */ | |
3125 | #if 0 | |
3126 | case GPCMD_READ_CD: | |
3127 | sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8]; | |
3128 | size = (2336 * sectors); | |
05d1c7c0 | 3129 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
3130 | break; |
3131 | #endif | |
3132 | case READ_TOC: | |
3133 | size = cdb[8]; | |
05d1c7c0 | 3134 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
3135 | break; |
3136 | case REQUEST_SENSE: | |
3137 | size = cdb[4]; | |
05d1c7c0 | 3138 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
3139 | break; |
3140 | case READ_ELEMENT_STATUS: | |
3141 | size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9]; | |
05d1c7c0 | 3142 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
3143 | break; |
3144 | case WRITE_BUFFER: | |
3145 | size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8]; | |
05d1c7c0 | 3146 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
3147 | break; |
3148 | case RESERVE: | |
3149 | case RESERVE_10: | |
3150 | /* | |
3151 | * The SPC-2 RESERVE does not contain a size in the SCSI CDB. | |
3152 | * Assume the passthrough or $FABRIC_MOD will tell us about it. | |
3153 | */ | |
3154 | if (cdb[0] == RESERVE_10) | |
3155 | size = (cdb[7] << 8) | cdb[8]; | |
3156 | else | |
3157 | size = cmd->data_length; | |
3158 | ||
3159 | /* | |
3160 | * Setup the legacy emulated handler for SPC-2 and | |
3161 | * >= SPC-3 compatible reservation handling (CRH=1) | |
3162 | * Otherwise, we assume the underlying SCSI logic is | |
3163 | * is running in SPC_PASSTHROUGH, and wants reservations | |
3164 | * emulation disabled. | |
3165 | */ | |
3166 | cmd->transport_emulate_cdb = | |
e3d6f909 | 3167 | (su_dev->t10_pr.res_type != |
c66ac9db | 3168 | SPC_PASSTHROUGH) ? |
e3d6f909 | 3169 | core_scsi2_emulate_crh : NULL; |
c66ac9db NB |
3170 | cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB; |
3171 | break; | |
3172 | case RELEASE: | |
3173 | case RELEASE_10: | |
3174 | /* | |
3175 | * The SPC-2 RELEASE does not contain a size in the SCSI CDB. | |
3176 | * Assume the passthrough or $FABRIC_MOD will tell us about it. | |
3177 | */ | |
3178 | if (cdb[0] == RELEASE_10) | |
3179 | size = (cdb[7] << 8) | cdb[8]; | |
3180 | else | |
3181 | size = cmd->data_length; | |
3182 | ||
3183 | cmd->transport_emulate_cdb = | |
e3d6f909 | 3184 | (su_dev->t10_pr.res_type != |
c66ac9db | 3185 | SPC_PASSTHROUGH) ? |
e3d6f909 | 3186 | core_scsi2_emulate_crh : NULL; |
c66ac9db NB |
3187 | cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB; |
3188 | break; | |
3189 | case SYNCHRONIZE_CACHE: | |
3190 | case 0x91: /* SYNCHRONIZE_CACHE_16: */ | |
3191 | /* | |
3192 | * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE | |
3193 | */ | |
3194 | if (cdb[0] == SYNCHRONIZE_CACHE) { | |
3195 | sectors = transport_get_sectors_10(cdb, cmd, §or_ret); | |
a1d8b49a | 3196 | cmd->t_task_lba = transport_lba_32(cdb); |
c66ac9db NB |
3197 | } else { |
3198 | sectors = transport_get_sectors_16(cdb, cmd, §or_ret); | |
a1d8b49a | 3199 | cmd->t_task_lba = transport_lba_64(cdb); |
c66ac9db NB |
3200 | } |
3201 | if (sector_ret) | |
3202 | goto out_unsupported_cdb; | |
3203 | ||
3204 | size = transport_get_size(sectors, cdb, cmd); | |
3205 | cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB; | |
3206 | ||
3207 | /* | |
3208 | * For TCM/pSCSI passthrough, skip cmd->transport_emulate_cdb() | |
3209 | */ | |
e3d6f909 | 3210 | if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) |
c66ac9db NB |
3211 | break; |
3212 | /* | |
3213 | * Set SCF_EMULATE_CDB_ASYNC to ensure asynchronous operation | |
3214 | * for SYNCHRONIZE_CACHE* Immed=1 case in __transport_execute_tasks() | |
3215 | */ | |
3216 | cmd->se_cmd_flags |= SCF_EMULATE_CDB_ASYNC; | |
3217 | /* | |
3218 | * Check to ensure that LBA + Range does not exceed past end of | |
7abbe7f3 | 3219 | * device for IBLOCK and FILEIO ->do_sync_cache() backend calls |
c66ac9db | 3220 | */ |
7abbe7f3 NB |
3221 | if ((cmd->t_task_lba != 0) || (sectors != 0)) { |
3222 | if (transport_cmd_get_valid_sectors(cmd) < 0) | |
3223 | goto out_invalid_cdb_field; | |
3224 | } | |
c66ac9db NB |
3225 | break; |
3226 | case UNMAP: | |
3227 | size = get_unaligned_be16(&cdb[7]); | |
05d1c7c0 | 3228 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
3229 | break; |
3230 | case WRITE_SAME_16: | |
3231 | sectors = transport_get_sectors_16(cdb, cmd, §or_ret); | |
3232 | if (sector_ret) | |
3233 | goto out_unsupported_cdb; | |
dd3a5ad8 | 3234 | |
6708bb27 | 3235 | if (sectors) |
12850626 | 3236 | size = transport_get_size(1, cdb, cmd); |
6708bb27 AG |
3237 | else { |
3238 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); | |
3239 | goto out_invalid_cdb_field; | |
3240 | } | |
dd3a5ad8 | 3241 | |
5db0753b | 3242 | cmd->t_task_lba = get_unaligned_be64(&cdb[2]); |
706d5860 NB |
3243 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
3244 | ||
3245 | if (target_check_write_same_discard(&cdb[1], dev) < 0) | |
3246 | goto out_invalid_cdb_field; | |
3247 | break; | |
3248 | case WRITE_SAME: | |
3249 | sectors = transport_get_sectors_10(cdb, cmd, §or_ret); | |
3250 | if (sector_ret) | |
3251 | goto out_unsupported_cdb; | |
3252 | ||
3253 | if (sectors) | |
12850626 | 3254 | size = transport_get_size(1, cdb, cmd); |
706d5860 NB |
3255 | else { |
3256 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); | |
3257 | goto out_invalid_cdb_field; | |
c66ac9db | 3258 | } |
706d5860 NB |
3259 | |
3260 | cmd->t_task_lba = get_unaligned_be32(&cdb[2]); | |
c66ac9db | 3261 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
706d5860 NB |
3262 | /* |
3263 | * Follow sbcr26 with WRITE_SAME (10) and check for the existence | |
3264 | * of byte 1 bit 3 UNMAP instead of original reserved field | |
3265 | */ | |
3266 | if (target_check_write_same_discard(&cdb[1], dev) < 0) | |
3267 | goto out_invalid_cdb_field; | |
c66ac9db NB |
3268 | break; |
3269 | case ALLOW_MEDIUM_REMOVAL: | |
3270 | case GPCMD_CLOSE_TRACK: | |
3271 | case ERASE: | |
3272 | case INITIALIZE_ELEMENT_STATUS: | |
3273 | case GPCMD_LOAD_UNLOAD: | |
3274 | case REZERO_UNIT: | |
3275 | case SEEK_10: | |
3276 | case GPCMD_SET_SPEED: | |
3277 | case SPACE: | |
3278 | case START_STOP: | |
3279 | case TEST_UNIT_READY: | |
3280 | case VERIFY: | |
3281 | case WRITE_FILEMARKS: | |
3282 | case MOVE_MEDIUM: | |
3283 | cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB; | |
3284 | break; | |
3285 | case REPORT_LUNS: | |
3286 | cmd->transport_emulate_cdb = | |
e3d6f909 | 3287 | transport_core_report_lun_response; |
c66ac9db NB |
3288 | size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; |
3289 | /* | |
3290 | * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS | |
3291 | * See spc4r17 section 5.3 | |
3292 | */ | |
5951146d | 3293 | if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) |
e66ecd50 | 3294 | cmd->sam_task_attr = MSG_HEAD_TAG; |
05d1c7c0 | 3295 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
3296 | break; |
3297 | default: | |
6708bb27 | 3298 | pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode" |
c66ac9db | 3299 | " 0x%02x, sending CHECK_CONDITION.\n", |
e3d6f909 | 3300 | cmd->se_tfo->get_fabric_name(), cdb[0]); |
c66ac9db NB |
3301 | goto out_unsupported_cdb; |
3302 | } | |
3303 | ||
3304 | if (size != cmd->data_length) { | |
6708bb27 | 3305 | pr_warn("TARGET_CORE[%s]: Expected Transfer Length:" |
c66ac9db | 3306 | " %u does not match SCSI CDB Length: %u for SAM Opcode:" |
e3d6f909 | 3307 | " 0x%02x\n", cmd->se_tfo->get_fabric_name(), |
c66ac9db NB |
3308 | cmd->data_length, size, cdb[0]); |
3309 | ||
3310 | cmd->cmd_spdtl = size; | |
3311 | ||
3312 | if (cmd->data_direction == DMA_TO_DEVICE) { | |
6708bb27 | 3313 | pr_err("Rejecting underflow/overflow" |
c66ac9db NB |
3314 | " WRITE data\n"); |
3315 | goto out_invalid_cdb_field; | |
3316 | } | |
3317 | /* | |
3318 | * Reject READ_* or WRITE_* with overflow/underflow for | |
3319 | * type SCF_SCSI_DATA_SG_IO_CDB. | |
3320 | */ | |
6708bb27 AG |
3321 | if (!ret && (dev->se_sub_dev->se_dev_attrib.block_size != 512)) { |
3322 | pr_err("Failing OVERFLOW/UNDERFLOW for LBA op" | |
c66ac9db | 3323 | " CDB on non 512-byte sector setup subsystem" |
e3d6f909 | 3324 | " plugin: %s\n", dev->transport->name); |
c66ac9db NB |
3325 | /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */ |
3326 | goto out_invalid_cdb_field; | |
3327 | } | |
3328 | ||
3329 | if (size > cmd->data_length) { | |
3330 | cmd->se_cmd_flags |= SCF_OVERFLOW_BIT; | |
3331 | cmd->residual_count = (size - cmd->data_length); | |
3332 | } else { | |
3333 | cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT; | |
3334 | cmd->residual_count = (cmd->data_length - size); | |
3335 | } | |
3336 | cmd->data_length = size; | |
3337 | } | |
3338 | ||
d0229ae3 AG |
3339 | /* Let's limit control cdbs to a page, for simplicity's sake. */ |
3340 | if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) && | |
3341 | size > PAGE_SIZE) | |
3342 | goto out_invalid_cdb_field; | |
3343 | ||
c66ac9db NB |
3344 | transport_set_supported_SAM_opcode(cmd); |
3345 | return ret; | |
3346 | ||
3347 | out_unsupported_cdb: | |
3348 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
3349 | cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; | |
5951146d | 3350 | return -EINVAL; |
c66ac9db NB |
3351 | out_invalid_cdb_field: |
3352 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
3353 | cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; | |
5951146d | 3354 | return -EINVAL; |
c66ac9db NB |
3355 | } |
3356 | ||
c66ac9db NB |
3357 | /* |
3358 | * Called from transport_generic_complete_ok() and | |
3359 | * transport_generic_request_failure() to determine which dormant/delayed | |
3360 | * and ordered cmds need to have their tasks added to the execution queue. | |
3361 | */ | |
3362 | static void transport_complete_task_attr(struct se_cmd *cmd) | |
3363 | { | |
5951146d | 3364 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
3365 | struct se_cmd *cmd_p, *cmd_tmp; |
3366 | int new_active_tasks = 0; | |
3367 | ||
e66ecd50 | 3368 | if (cmd->sam_task_attr == MSG_SIMPLE_TAG) { |
c66ac9db NB |
3369 | atomic_dec(&dev->simple_cmds); |
3370 | smp_mb__after_atomic_dec(); | |
3371 | dev->dev_cur_ordered_id++; | |
6708bb27 | 3372 | pr_debug("Incremented dev->dev_cur_ordered_id: %u for" |
c66ac9db NB |
3373 | " SIMPLE: %u\n", dev->dev_cur_ordered_id, |
3374 | cmd->se_ordered_id); | |
e66ecd50 | 3375 | } else if (cmd->sam_task_attr == MSG_HEAD_TAG) { |
c66ac9db NB |
3376 | atomic_dec(&dev->dev_hoq_count); |
3377 | smp_mb__after_atomic_dec(); | |
3378 | dev->dev_cur_ordered_id++; | |
6708bb27 | 3379 | pr_debug("Incremented dev_cur_ordered_id: %u for" |
c66ac9db NB |
3380 | " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id, |
3381 | cmd->se_ordered_id); | |
e66ecd50 | 3382 | } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) { |
c66ac9db | 3383 | spin_lock(&dev->ordered_cmd_lock); |
5951146d | 3384 | list_del(&cmd->se_ordered_node); |
c66ac9db NB |
3385 | atomic_dec(&dev->dev_ordered_sync); |
3386 | smp_mb__after_atomic_dec(); | |
3387 | spin_unlock(&dev->ordered_cmd_lock); | |
3388 | ||
3389 | dev->dev_cur_ordered_id++; | |
6708bb27 | 3390 | pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:" |
c66ac9db NB |
3391 | " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id); |
3392 | } | |
3393 | /* | |
3394 | * Process all commands up to the last received | |
3395 | * ORDERED task attribute which requires another blocking | |
3396 | * boundary | |
3397 | */ | |
3398 | spin_lock(&dev->delayed_cmd_lock); | |
3399 | list_for_each_entry_safe(cmd_p, cmd_tmp, | |
5951146d | 3400 | &dev->delayed_cmd_list, se_delayed_node) { |
c66ac9db | 3401 | |
5951146d | 3402 | list_del(&cmd_p->se_delayed_node); |
c66ac9db NB |
3403 | spin_unlock(&dev->delayed_cmd_lock); |
3404 | ||
6708bb27 | 3405 | pr_debug("Calling add_tasks() for" |
c66ac9db NB |
3406 | " cmd_p: 0x%02x Task Attr: 0x%02x" |
3407 | " Dormant -> Active, se_ordered_id: %u\n", | |
6708bb27 | 3408 | cmd_p->t_task_cdb[0], |
c66ac9db NB |
3409 | cmd_p->sam_task_attr, cmd_p->se_ordered_id); |
3410 | ||
3411 | transport_add_tasks_from_cmd(cmd_p); | |
3412 | new_active_tasks++; | |
3413 | ||
3414 | spin_lock(&dev->delayed_cmd_lock); | |
e66ecd50 | 3415 | if (cmd_p->sam_task_attr == MSG_ORDERED_TAG) |
c66ac9db NB |
3416 | break; |
3417 | } | |
3418 | spin_unlock(&dev->delayed_cmd_lock); | |
3419 | /* | |
3420 | * If new tasks have become active, wake up the transport thread | |
3421 | * to do the processing of the Active tasks. | |
3422 | */ | |
3423 | if (new_active_tasks != 0) | |
e3d6f909 | 3424 | wake_up_interruptible(&dev->dev_queue_obj.thread_wq); |
c66ac9db NB |
3425 | } |
3426 | ||
e057f533 | 3427 | static void transport_complete_qf(struct se_cmd *cmd) |
07bde79a NB |
3428 | { |
3429 | int ret = 0; | |
3430 | ||
e057f533 CH |
3431 | transport_stop_all_task_timers(cmd); |
3432 | if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) | |
3433 | transport_complete_task_attr(cmd); | |
3434 | ||
3435 | if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) { | |
3436 | ret = cmd->se_tfo->queue_status(cmd); | |
3437 | if (ret) | |
3438 | goto out; | |
3439 | } | |
07bde79a NB |
3440 | |
3441 | switch (cmd->data_direction) { | |
3442 | case DMA_FROM_DEVICE: | |
3443 | ret = cmd->se_tfo->queue_data_in(cmd); | |
3444 | break; | |
3445 | case DMA_TO_DEVICE: | |
ec98f782 | 3446 | if (cmd->t_bidi_data_sg) { |
07bde79a NB |
3447 | ret = cmd->se_tfo->queue_data_in(cmd); |
3448 | if (ret < 0) | |
e057f533 | 3449 | break; |
07bde79a NB |
3450 | } |
3451 | /* Fall through for DMA_TO_DEVICE */ | |
3452 | case DMA_NONE: | |
3453 | ret = cmd->se_tfo->queue_status(cmd); | |
3454 | break; | |
3455 | default: | |
3456 | break; | |
3457 | } | |
3458 | ||
e057f533 CH |
3459 | out: |
3460 | if (ret < 0) { | |
3461 | transport_handle_queue_full(cmd, cmd->se_dev); | |
3462 | return; | |
3463 | } | |
3464 | transport_lun_remove_cmd(cmd); | |
3465 | transport_cmd_check_stop_to_fabric(cmd); | |
07bde79a NB |
3466 | } |
3467 | ||
3468 | static void transport_handle_queue_full( | |
3469 | struct se_cmd *cmd, | |
e057f533 | 3470 | struct se_device *dev) |
07bde79a NB |
3471 | { |
3472 | spin_lock_irq(&dev->qf_cmd_lock); | |
07bde79a NB |
3473 | list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list); |
3474 | atomic_inc(&dev->dev_qf_count); | |
3475 | smp_mb__after_atomic_inc(); | |
3476 | spin_unlock_irq(&cmd->se_dev->qf_cmd_lock); | |
3477 | ||
3478 | schedule_work(&cmd->se_dev->qf_work_queue); | |
3479 | } | |
3480 | ||
c66ac9db NB |
3481 | static void transport_generic_complete_ok(struct se_cmd *cmd) |
3482 | { | |
07bde79a | 3483 | int reason = 0, ret; |
c66ac9db NB |
3484 | /* |
3485 | * Check if we need to move delayed/dormant tasks from cmds on the | |
3486 | * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task | |
3487 | * Attribute. | |
3488 | */ | |
5951146d | 3489 | if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) |
c66ac9db | 3490 | transport_complete_task_attr(cmd); |
07bde79a NB |
3491 | /* |
3492 | * Check to schedule QUEUE_FULL work, or execute an existing | |
3493 | * cmd->transport_qf_callback() | |
3494 | */ | |
3495 | if (atomic_read(&cmd->se_dev->dev_qf_count) != 0) | |
3496 | schedule_work(&cmd->se_dev->qf_work_queue); | |
3497 | ||
c66ac9db NB |
3498 | /* |
3499 | * Check if we need to retrieve a sense buffer from | |
3500 | * the struct se_cmd in question. | |
3501 | */ | |
3502 | if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) { | |
3503 | if (transport_get_sense_data(cmd) < 0) | |
3504 | reason = TCM_NON_EXISTENT_LUN; | |
3505 | ||
3506 | /* | |
3507 | * Only set when an struct se_task->task_scsi_status returned | |
3508 | * a non GOOD status. | |
3509 | */ | |
3510 | if (cmd->scsi_status) { | |
07bde79a | 3511 | ret = transport_send_check_condition_and_sense( |
c66ac9db | 3512 | cmd, reason, 1); |
07bde79a NB |
3513 | if (ret == -EAGAIN) |
3514 | goto queue_full; | |
3515 | ||
c66ac9db NB |
3516 | transport_lun_remove_cmd(cmd); |
3517 | transport_cmd_check_stop_to_fabric(cmd); | |
3518 | return; | |
3519 | } | |
3520 | } | |
3521 | /* | |
25985edc | 3522 | * Check for a callback, used by amongst other things |
c66ac9db NB |
3523 | * XDWRITE_READ_10 emulation. |
3524 | */ | |
3525 | if (cmd->transport_complete_callback) | |
3526 | cmd->transport_complete_callback(cmd); | |
3527 | ||
3528 | switch (cmd->data_direction) { | |
3529 | case DMA_FROM_DEVICE: | |
3530 | spin_lock(&cmd->se_lun->lun_sep_lock); | |
e3d6f909 AG |
3531 | if (cmd->se_lun->lun_sep) { |
3532 | cmd->se_lun->lun_sep->sep_stats.tx_data_octets += | |
c66ac9db NB |
3533 | cmd->data_length; |
3534 | } | |
3535 | spin_unlock(&cmd->se_lun->lun_sep_lock); | |
c66ac9db | 3536 | |
07bde79a NB |
3537 | ret = cmd->se_tfo->queue_data_in(cmd); |
3538 | if (ret == -EAGAIN) | |
3539 | goto queue_full; | |
c66ac9db NB |
3540 | break; |
3541 | case DMA_TO_DEVICE: | |
3542 | spin_lock(&cmd->se_lun->lun_sep_lock); | |
e3d6f909 AG |
3543 | if (cmd->se_lun->lun_sep) { |
3544 | cmd->se_lun->lun_sep->sep_stats.rx_data_octets += | |
c66ac9db NB |
3545 | cmd->data_length; |
3546 | } | |
3547 | spin_unlock(&cmd->se_lun->lun_sep_lock); | |
3548 | /* | |
3549 | * Check if we need to send READ payload for BIDI-COMMAND | |
3550 | */ | |
ec98f782 | 3551 | if (cmd->t_bidi_data_sg) { |
c66ac9db | 3552 | spin_lock(&cmd->se_lun->lun_sep_lock); |
e3d6f909 AG |
3553 | if (cmd->se_lun->lun_sep) { |
3554 | cmd->se_lun->lun_sep->sep_stats.tx_data_octets += | |
c66ac9db NB |
3555 | cmd->data_length; |
3556 | } | |
3557 | spin_unlock(&cmd->se_lun->lun_sep_lock); | |
07bde79a NB |
3558 | ret = cmd->se_tfo->queue_data_in(cmd); |
3559 | if (ret == -EAGAIN) | |
3560 | goto queue_full; | |
c66ac9db NB |
3561 | break; |
3562 | } | |
3563 | /* Fall through for DMA_TO_DEVICE */ | |
3564 | case DMA_NONE: | |
07bde79a NB |
3565 | ret = cmd->se_tfo->queue_status(cmd); |
3566 | if (ret == -EAGAIN) | |
3567 | goto queue_full; | |
c66ac9db NB |
3568 | break; |
3569 | default: | |
3570 | break; | |
3571 | } | |
3572 | ||
3573 | transport_lun_remove_cmd(cmd); | |
3574 | transport_cmd_check_stop_to_fabric(cmd); | |
07bde79a NB |
3575 | return; |
3576 | ||
3577 | queue_full: | |
6708bb27 | 3578 | pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p," |
07bde79a | 3579 | " data_direction: %d\n", cmd, cmd->data_direction); |
e057f533 CH |
3580 | cmd->t_state = TRANSPORT_COMPLETE_QF_OK; |
3581 | transport_handle_queue_full(cmd, cmd->se_dev); | |
c66ac9db NB |
3582 | } |
3583 | ||
3584 | static void transport_free_dev_tasks(struct se_cmd *cmd) | |
3585 | { | |
3586 | struct se_task *task, *task_tmp; | |
3587 | unsigned long flags; | |
3588 | ||
a1d8b49a | 3589 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 3590 | list_for_each_entry_safe(task, task_tmp, |
a1d8b49a | 3591 | &cmd->t_task_list, t_list) { |
6c76bf95 | 3592 | if (task->task_flags & TF_ACTIVE) |
c66ac9db NB |
3593 | continue; |
3594 | ||
3595 | kfree(task->task_sg_bidi); | |
3596 | kfree(task->task_sg); | |
3597 | ||
3598 | list_del(&task->t_list); | |
3599 | ||
a1d8b49a | 3600 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
42bf829e | 3601 | cmd->se_dev->transport->free_task(task); |
a1d8b49a | 3602 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 3603 | } |
a1d8b49a | 3604 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
3605 | } |
3606 | ||
6708bb27 | 3607 | static inline void transport_free_sgl(struct scatterlist *sgl, int nents) |
c66ac9db | 3608 | { |
ec98f782 | 3609 | struct scatterlist *sg; |
ec98f782 | 3610 | int count; |
c66ac9db | 3611 | |
6708bb27 AG |
3612 | for_each_sg(sgl, sg, nents, count) |
3613 | __free_page(sg_page(sg)); | |
c66ac9db | 3614 | |
6708bb27 AG |
3615 | kfree(sgl); |
3616 | } | |
c66ac9db | 3617 | |
6708bb27 AG |
3618 | static inline void transport_free_pages(struct se_cmd *cmd) |
3619 | { | |
3620 | if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) | |
3621 | return; | |
3622 | ||
3623 | transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents); | |
ec98f782 AG |
3624 | cmd->t_data_sg = NULL; |
3625 | cmd->t_data_nents = 0; | |
c66ac9db | 3626 | |
6708bb27 | 3627 | transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents); |
ec98f782 AG |
3628 | cmd->t_bidi_data_sg = NULL; |
3629 | cmd->t_bidi_data_nents = 0; | |
c66ac9db NB |
3630 | } |
3631 | ||
d3df7825 CH |
3632 | /** |
3633 | * transport_put_cmd - release a reference to a command | |
3634 | * @cmd: command to release | |
3635 | * | |
3636 | * This routine releases our reference to the command and frees it if possible. | |
3637 | */ | |
39c05f32 | 3638 | static void transport_put_cmd(struct se_cmd *cmd) |
c66ac9db NB |
3639 | { |
3640 | unsigned long flags; | |
4911e3cc | 3641 | int free_tasks = 0; |
c66ac9db | 3642 | |
a1d8b49a | 3643 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
4911e3cc CH |
3644 | if (atomic_read(&cmd->t_fe_count)) { |
3645 | if (!atomic_dec_and_test(&cmd->t_fe_count)) | |
3646 | goto out_busy; | |
3647 | } | |
3648 | ||
3649 | if (atomic_read(&cmd->t_se_count)) { | |
3650 | if (!atomic_dec_and_test(&cmd->t_se_count)) | |
3651 | goto out_busy; | |
3652 | } | |
3653 | ||
3654 | if (atomic_read(&cmd->transport_dev_active)) { | |
3655 | atomic_set(&cmd->transport_dev_active, 0); | |
3656 | transport_all_task_dev_remove_state(cmd); | |
3657 | free_tasks = 1; | |
c66ac9db | 3658 | } |
a1d8b49a | 3659 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 3660 | |
4911e3cc CH |
3661 | if (free_tasks != 0) |
3662 | transport_free_dev_tasks(cmd); | |
d3df7825 | 3663 | |
c66ac9db | 3664 | transport_free_pages(cmd); |
31afc39c | 3665 | transport_release_cmd(cmd); |
39c05f32 | 3666 | return; |
4911e3cc CH |
3667 | out_busy: |
3668 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
c66ac9db NB |
3669 | } |
3670 | ||
c66ac9db | 3671 | /* |
ec98f782 AG |
3672 | * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of |
3673 | * allocating in the core. | |
c66ac9db NB |
3674 | * @cmd: Associated se_cmd descriptor |
3675 | * @mem: SGL style memory for TCM WRITE / READ | |
3676 | * @sg_mem_num: Number of SGL elements | |
3677 | * @mem_bidi_in: SGL style memory for TCM BIDI READ | |
3678 | * @sg_mem_bidi_num: Number of BIDI READ SGL elements | |
3679 | * | |
3680 | * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage | |
3681 | * of parameters. | |
3682 | */ | |
3683 | int transport_generic_map_mem_to_cmd( | |
3684 | struct se_cmd *cmd, | |
5951146d AG |
3685 | struct scatterlist *sgl, |
3686 | u32 sgl_count, | |
3687 | struct scatterlist *sgl_bidi, | |
3688 | u32 sgl_bidi_count) | |
c66ac9db | 3689 | { |
5951146d | 3690 | if (!sgl || !sgl_count) |
c66ac9db | 3691 | return 0; |
c66ac9db | 3692 | |
c66ac9db NB |
3693 | if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) || |
3694 | (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) { | |
c66ac9db | 3695 | |
ec98f782 AG |
3696 | cmd->t_data_sg = sgl; |
3697 | cmd->t_data_nents = sgl_count; | |
c66ac9db | 3698 | |
ec98f782 AG |
3699 | if (sgl_bidi && sgl_bidi_count) { |
3700 | cmd->t_bidi_data_sg = sgl_bidi; | |
3701 | cmd->t_bidi_data_nents = sgl_bidi_count; | |
c66ac9db NB |
3702 | } |
3703 | cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC; | |
c66ac9db NB |
3704 | } |
3705 | ||
3706 | return 0; | |
3707 | } | |
3708 | EXPORT_SYMBOL(transport_generic_map_mem_to_cmd); | |
3709 | ||
c66ac9db NB |
3710 | static int transport_new_cmd_obj(struct se_cmd *cmd) |
3711 | { | |
5951146d | 3712 | struct se_device *dev = cmd->se_dev; |
01cde4d5 | 3713 | int set_counts = 1, rc, task_cdbs; |
c66ac9db | 3714 | |
ec98f782 AG |
3715 | /* |
3716 | * Setup any BIDI READ tasks and memory from | |
3717 | * cmd->t_mem_bidi_list so the READ struct se_tasks | |
3718 | * are queued first for the non pSCSI passthrough case. | |
3719 | */ | |
3720 | if (cmd->t_bidi_data_sg && | |
3721 | (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV)) { | |
3722 | rc = transport_allocate_tasks(cmd, | |
3723 | cmd->t_task_lba, | |
3724 | DMA_FROM_DEVICE, | |
3725 | cmd->t_bidi_data_sg, | |
3726 | cmd->t_bidi_data_nents); | |
6708bb27 | 3727 | if (rc <= 0) { |
c66ac9db NB |
3728 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; |
3729 | cmd->scsi_sense_reason = | |
ec98f782 | 3730 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
01cde4d5 | 3731 | return -EINVAL; |
c66ac9db | 3732 | } |
ec98f782 AG |
3733 | atomic_inc(&cmd->t_fe_count); |
3734 | atomic_inc(&cmd->t_se_count); | |
3735 | set_counts = 0; | |
3736 | } | |
3737 | /* | |
3738 | * Setup the tasks and memory from cmd->t_mem_list | |
3739 | * Note for BIDI transfers this will contain the WRITE payload | |
3740 | */ | |
3741 | task_cdbs = transport_allocate_tasks(cmd, | |
3742 | cmd->t_task_lba, | |
3743 | cmd->data_direction, | |
3744 | cmd->t_data_sg, | |
3745 | cmd->t_data_nents); | |
6708bb27 | 3746 | if (task_cdbs <= 0) { |
ec98f782 AG |
3747 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; |
3748 | cmd->scsi_sense_reason = | |
3749 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
01cde4d5 | 3750 | return -EINVAL; |
ec98f782 | 3751 | } |
c66ac9db | 3752 | |
ec98f782 AG |
3753 | if (set_counts) { |
3754 | atomic_inc(&cmd->t_fe_count); | |
3755 | atomic_inc(&cmd->t_se_count); | |
c66ac9db NB |
3756 | } |
3757 | ||
ec98f782 AG |
3758 | cmd->t_task_list_num = task_cdbs; |
3759 | ||
a1d8b49a AG |
3760 | atomic_set(&cmd->t_task_cdbs_left, task_cdbs); |
3761 | atomic_set(&cmd->t_task_cdbs_ex_left, task_cdbs); | |
3762 | atomic_set(&cmd->t_task_cdbs_timeout_left, task_cdbs); | |
c66ac9db NB |
3763 | return 0; |
3764 | } | |
3765 | ||
05d1c7c0 AG |
3766 | void *transport_kmap_first_data_page(struct se_cmd *cmd) |
3767 | { | |
ec98f782 | 3768 | struct scatterlist *sg = cmd->t_data_sg; |
05d1c7c0 | 3769 | |
ec98f782 | 3770 | BUG_ON(!sg); |
05d1c7c0 | 3771 | /* |
ec98f782 AG |
3772 | * We need to take into account a possible offset here for fabrics like |
3773 | * tcm_loop who may be using a contig buffer from the SCSI midlayer for | |
3774 | * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd() | |
05d1c7c0 | 3775 | */ |
ec98f782 | 3776 | return kmap(sg_page(sg)) + sg->offset; |
05d1c7c0 AG |
3777 | } |
3778 | EXPORT_SYMBOL(transport_kmap_first_data_page); | |
3779 | ||
3780 | void transport_kunmap_first_data_page(struct se_cmd *cmd) | |
3781 | { | |
ec98f782 | 3782 | kunmap(sg_page(cmd->t_data_sg)); |
05d1c7c0 AG |
3783 | } |
3784 | EXPORT_SYMBOL(transport_kunmap_first_data_page); | |
3785 | ||
c66ac9db | 3786 | static int |
05d1c7c0 | 3787 | transport_generic_get_mem(struct se_cmd *cmd) |
c66ac9db | 3788 | { |
ec98f782 AG |
3789 | u32 length = cmd->data_length; |
3790 | unsigned int nents; | |
3791 | struct page *page; | |
3792 | int i = 0; | |
c66ac9db | 3793 | |
ec98f782 AG |
3794 | nents = DIV_ROUND_UP(length, PAGE_SIZE); |
3795 | cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL); | |
3796 | if (!cmd->t_data_sg) | |
3797 | return -ENOMEM; | |
c66ac9db | 3798 | |
ec98f782 AG |
3799 | cmd->t_data_nents = nents; |
3800 | sg_init_table(cmd->t_data_sg, nents); | |
c66ac9db | 3801 | |
ec98f782 AG |
3802 | while (length) { |
3803 | u32 page_len = min_t(u32, length, PAGE_SIZE); | |
3804 | page = alloc_page(GFP_KERNEL | __GFP_ZERO); | |
3805 | if (!page) | |
3806 | goto out; | |
c66ac9db | 3807 | |
ec98f782 AG |
3808 | sg_set_page(&cmd->t_data_sg[i], page, page_len, 0); |
3809 | length -= page_len; | |
3810 | i++; | |
c66ac9db | 3811 | } |
c66ac9db | 3812 | return 0; |
c66ac9db | 3813 | |
ec98f782 AG |
3814 | out: |
3815 | while (i >= 0) { | |
3816 | __free_page(sg_page(&cmd->t_data_sg[i])); | |
3817 | i--; | |
c66ac9db | 3818 | } |
ec98f782 AG |
3819 | kfree(cmd->t_data_sg); |
3820 | cmd->t_data_sg = NULL; | |
3821 | return -ENOMEM; | |
c66ac9db NB |
3822 | } |
3823 | ||
a1d8b49a AG |
3824 | /* Reduce sectors if they are too long for the device */ |
3825 | static inline sector_t transport_limit_task_sectors( | |
c66ac9db NB |
3826 | struct se_device *dev, |
3827 | unsigned long long lba, | |
a1d8b49a | 3828 | sector_t sectors) |
c66ac9db | 3829 | { |
a1d8b49a | 3830 | sectors = min_t(sector_t, sectors, dev->se_sub_dev->se_dev_attrib.max_sectors); |
c66ac9db | 3831 | |
a1d8b49a AG |
3832 | if (dev->transport->get_device_type(dev) == TYPE_DISK) |
3833 | if ((lba + sectors) > transport_dev_end_lba(dev)) | |
3834 | sectors = ((transport_dev_end_lba(dev) - lba) + 1); | |
c66ac9db | 3835 | |
a1d8b49a | 3836 | return sectors; |
c66ac9db NB |
3837 | } |
3838 | ||
c66ac9db NB |
3839 | |
3840 | /* | |
3841 | * This function can be used by HW target mode drivers to create a linked | |
3842 | * scatterlist from all contiguously allocated struct se_task->task_sg[]. | |
3843 | * This is intended to be called during the completion path by TCM Core | |
3844 | * when struct target_core_fabric_ops->check_task_sg_chaining is enabled. | |
3845 | */ | |
3846 | void transport_do_task_sg_chain(struct se_cmd *cmd) | |
3847 | { | |
ec98f782 AG |
3848 | struct scatterlist *sg_first = NULL; |
3849 | struct scatterlist *sg_prev = NULL; | |
3850 | int sg_prev_nents = 0; | |
3851 | struct scatterlist *sg; | |
c66ac9db | 3852 | struct se_task *task; |
ec98f782 | 3853 | u32 chained_nents = 0; |
c66ac9db NB |
3854 | int i; |
3855 | ||
ec98f782 AG |
3856 | BUG_ON(!cmd->se_tfo->task_sg_chaining); |
3857 | ||
c66ac9db NB |
3858 | /* |
3859 | * Walk the struct se_task list and setup scatterlist chains | |
a1d8b49a | 3860 | * for each contiguously allocated struct se_task->task_sg[]. |
c66ac9db | 3861 | */ |
a1d8b49a | 3862 | list_for_each_entry(task, &cmd->t_task_list, t_list) { |
ec98f782 | 3863 | if (!task->task_sg) |
c66ac9db NB |
3864 | continue; |
3865 | ||
ec98f782 AG |
3866 | if (!sg_first) { |
3867 | sg_first = task->task_sg; | |
6708bb27 | 3868 | chained_nents = task->task_sg_nents; |
97868c89 | 3869 | } else { |
ec98f782 | 3870 | sg_chain(sg_prev, sg_prev_nents, task->task_sg); |
6708bb27 | 3871 | chained_nents += task->task_sg_nents; |
97868c89 | 3872 | } |
c3c74c7a NB |
3873 | /* |
3874 | * For the padded tasks, use the extra SGL vector allocated | |
3875 | * in transport_allocate_data_tasks() for the sg_prev_nents | |
04629b7b CH |
3876 | * offset into sg_chain() above. |
3877 | * | |
3878 | * We do not need the padding for the last task (or a single | |
3879 | * task), but in that case we will never use the sg_prev_nents | |
3880 | * value below which would be incorrect. | |
c3c74c7a | 3881 | */ |
04629b7b | 3882 | sg_prev_nents = (task->task_sg_nents + 1); |
ec98f782 | 3883 | sg_prev = task->task_sg; |
c66ac9db NB |
3884 | } |
3885 | /* | |
3886 | * Setup the starting pointer and total t_tasks_sg_linked_no including | |
3887 | * padding SGs for linking and to mark the end. | |
3888 | */ | |
a1d8b49a | 3889 | cmd->t_tasks_sg_chained = sg_first; |
ec98f782 | 3890 | cmd->t_tasks_sg_chained_no = chained_nents; |
c66ac9db | 3891 | |
6708bb27 | 3892 | pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and" |
a1d8b49a AG |
3893 | " t_tasks_sg_chained_no: %u\n", cmd, cmd->t_tasks_sg_chained, |
3894 | cmd->t_tasks_sg_chained_no); | |
c66ac9db | 3895 | |
a1d8b49a AG |
3896 | for_each_sg(cmd->t_tasks_sg_chained, sg, |
3897 | cmd->t_tasks_sg_chained_no, i) { | |
c66ac9db | 3898 | |
6708bb27 | 3899 | pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n", |
5951146d | 3900 | i, sg, sg_page(sg), sg->length, sg->offset); |
c66ac9db | 3901 | if (sg_is_chain(sg)) |
6708bb27 | 3902 | pr_debug("SG: %p sg_is_chain=1\n", sg); |
c66ac9db | 3903 | if (sg_is_last(sg)) |
6708bb27 | 3904 | pr_debug("SG: %p sg_is_last=1\n", sg); |
c66ac9db | 3905 | } |
c66ac9db NB |
3906 | } |
3907 | EXPORT_SYMBOL(transport_do_task_sg_chain); | |
3908 | ||
a1d8b49a AG |
3909 | /* |
3910 | * Break up cmd into chunks transport can handle | |
3911 | */ | |
ec98f782 | 3912 | static int transport_allocate_data_tasks( |
c66ac9db NB |
3913 | struct se_cmd *cmd, |
3914 | unsigned long long lba, | |
c66ac9db | 3915 | enum dma_data_direction data_direction, |
ec98f782 AG |
3916 | struct scatterlist *sgl, |
3917 | unsigned int sgl_nents) | |
c66ac9db | 3918 | { |
c66ac9db | 3919 | struct se_task *task; |
5951146d | 3920 | struct se_device *dev = cmd->se_dev; |
ec98f782 | 3921 | unsigned long flags; |
a3eedc22 | 3922 | int task_count, i; |
277c5f27 | 3923 | sector_t sectors, dev_max_sectors = dev->se_sub_dev->se_dev_attrib.max_sectors; |
ec98f782 AG |
3924 | u32 sector_size = dev->se_sub_dev->se_dev_attrib.block_size; |
3925 | struct scatterlist *sg; | |
3926 | struct scatterlist *cmd_sg; | |
a1d8b49a | 3927 | |
ec98f782 AG |
3928 | WARN_ON(cmd->data_length % sector_size); |
3929 | sectors = DIV_ROUND_UP(cmd->data_length, sector_size); | |
277c5f27 NB |
3930 | task_count = DIV_ROUND_UP_SECTOR_T(sectors, dev_max_sectors); |
3931 | ||
ec98f782 AG |
3932 | cmd_sg = sgl; |
3933 | for (i = 0; i < task_count; i++) { | |
c3c74c7a | 3934 | unsigned int task_size, task_sg_nents_padded; |
ec98f782 | 3935 | int count; |
a1d8b49a | 3936 | |
c66ac9db | 3937 | task = transport_generic_get_task(cmd, data_direction); |
a1d8b49a | 3938 | if (!task) |
ec98f782 | 3939 | return -ENOMEM; |
c66ac9db | 3940 | |
c66ac9db | 3941 | task->task_lba = lba; |
ec98f782 AG |
3942 | task->task_sectors = min(sectors, dev_max_sectors); |
3943 | task->task_size = task->task_sectors * sector_size; | |
c66ac9db | 3944 | |
525a48a2 NB |
3945 | /* |
3946 | * This now assumes that passed sg_ents are in PAGE_SIZE chunks | |
3947 | * in order to calculate the number per task SGL entries | |
3948 | */ | |
3949 | task->task_sg_nents = DIV_ROUND_UP(task->task_size, PAGE_SIZE); | |
c66ac9db | 3950 | /* |
ec98f782 AG |
3951 | * Check if the fabric module driver is requesting that all |
3952 | * struct se_task->task_sg[] be chained together.. If so, | |
3953 | * then allocate an extra padding SG entry for linking and | |
c3c74c7a NB |
3954 | * marking the end of the chained SGL for every task except |
3955 | * the last one for (task_count > 1) operation, or skipping | |
3956 | * the extra padding for the (task_count == 1) case. | |
c66ac9db | 3957 | */ |
c3c74c7a NB |
3958 | if (cmd->se_tfo->task_sg_chaining && (i < (task_count - 1))) { |
3959 | task_sg_nents_padded = (task->task_sg_nents + 1); | |
c3c74c7a NB |
3960 | } else |
3961 | task_sg_nents_padded = task->task_sg_nents; | |
c66ac9db | 3962 | |
1d20bb61 | 3963 | task->task_sg = kmalloc(sizeof(struct scatterlist) * |
c3c74c7a | 3964 | task_sg_nents_padded, GFP_KERNEL); |
ec98f782 AG |
3965 | if (!task->task_sg) { |
3966 | cmd->se_dev->transport->free_task(task); | |
3967 | return -ENOMEM; | |
3968 | } | |
3969 | ||
c3c74c7a | 3970 | sg_init_table(task->task_sg, task_sg_nents_padded); |
c66ac9db | 3971 | |
ec98f782 AG |
3972 | task_size = task->task_size; |
3973 | ||
3974 | /* Build new sgl, only up to task_size */ | |
6708bb27 | 3975 | for_each_sg(task->task_sg, sg, task->task_sg_nents, count) { |
ec98f782 AG |
3976 | if (cmd_sg->length > task_size) |
3977 | break; | |
3978 | ||
3979 | *sg = *cmd_sg; | |
3980 | task_size -= cmd_sg->length; | |
3981 | cmd_sg = sg_next(cmd_sg); | |
c66ac9db | 3982 | } |
c66ac9db | 3983 | |
ec98f782 AG |
3984 | lba += task->task_sectors; |
3985 | sectors -= task->task_sectors; | |
c66ac9db | 3986 | |
ec98f782 AG |
3987 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
3988 | list_add_tail(&task->t_list, &cmd->t_task_list); | |
3989 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
c66ac9db NB |
3990 | } |
3991 | ||
ec98f782 | 3992 | return task_count; |
c66ac9db NB |
3993 | } |
3994 | ||
3995 | static int | |
ec98f782 | 3996 | transport_allocate_control_task(struct se_cmd *cmd) |
c66ac9db | 3997 | { |
c66ac9db | 3998 | struct se_task *task; |
ec98f782 | 3999 | unsigned long flags; |
c66ac9db NB |
4000 | |
4001 | task = transport_generic_get_task(cmd, cmd->data_direction); | |
4002 | if (!task) | |
ec98f782 | 4003 | return -ENOMEM; |
c66ac9db | 4004 | |
ec98f782 AG |
4005 | task->task_sg = kmalloc(sizeof(struct scatterlist) * cmd->t_data_nents, |
4006 | GFP_KERNEL); | |
4007 | if (!task->task_sg) { | |
4008 | cmd->se_dev->transport->free_task(task); | |
4009 | return -ENOMEM; | |
4010 | } | |
4011 | ||
4012 | memcpy(task->task_sg, cmd->t_data_sg, | |
4013 | sizeof(struct scatterlist) * cmd->t_data_nents); | |
c66ac9db | 4014 | task->task_size = cmd->data_length; |
6708bb27 | 4015 | task->task_sg_nents = cmd->t_data_nents; |
c66ac9db | 4016 | |
ec98f782 AG |
4017 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
4018 | list_add_tail(&task->t_list, &cmd->t_task_list); | |
4019 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
c66ac9db | 4020 | |
6708bb27 | 4021 | /* Success! Return number of tasks allocated */ |
a3eedc22 | 4022 | return 1; |
ec98f782 AG |
4023 | } |
4024 | ||
4025 | static u32 transport_allocate_tasks( | |
4026 | struct se_cmd *cmd, | |
4027 | unsigned long long lba, | |
4028 | enum dma_data_direction data_direction, | |
4029 | struct scatterlist *sgl, | |
4030 | unsigned int sgl_nents) | |
4031 | { | |
01cde4d5 NB |
4032 | if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) { |
4033 | if (transport_cmd_get_valid_sectors(cmd) < 0) | |
4034 | return -EINVAL; | |
4035 | ||
ec98f782 AG |
4036 | return transport_allocate_data_tasks(cmd, lba, data_direction, |
4037 | sgl, sgl_nents); | |
01cde4d5 | 4038 | } else |
6708bb27 AG |
4039 | return transport_allocate_control_task(cmd); |
4040 | ||
c66ac9db NB |
4041 | } |
4042 | ||
ec98f782 | 4043 | |
c66ac9db NB |
4044 | /* transport_generic_new_cmd(): Called from transport_processing_thread() |
4045 | * | |
4046 | * Allocate storage transport resources from a set of values predefined | |
4047 | * by transport_generic_cmd_sequencer() from the iSCSI Target RX process. | |
4048 | * Any non zero return here is treated as an "out of resource' op here. | |
4049 | */ | |
4050 | /* | |
4051 | * Generate struct se_task(s) and/or their payloads for this CDB. | |
4052 | */ | |
a1d8b49a | 4053 | int transport_generic_new_cmd(struct se_cmd *cmd) |
c66ac9db | 4054 | { |
c66ac9db NB |
4055 | int ret = 0; |
4056 | ||
4057 | /* | |
4058 | * Determine is the TCM fabric module has already allocated physical | |
4059 | * memory, and is directly calling transport_generic_map_mem_to_cmd() | |
ec98f782 | 4060 | * beforehand. |
c66ac9db | 4061 | */ |
ec98f782 AG |
4062 | if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) && |
4063 | cmd->data_length) { | |
05d1c7c0 | 4064 | ret = transport_generic_get_mem(cmd); |
c66ac9db NB |
4065 | if (ret < 0) |
4066 | return ret; | |
4067 | } | |
1d20bb61 NB |
4068 | /* |
4069 | * Call transport_new_cmd_obj() to invoke transport_allocate_tasks() for | |
4070 | * control or data CDB types, and perform the map to backend subsystem | |
4071 | * code from SGL memory allocated here by transport_generic_get_mem(), or | |
4072 | * via pre-existing SGL memory setup explictly by fabric module code with | |
4073 | * transport_generic_map_mem_to_cmd(). | |
4074 | */ | |
c66ac9db NB |
4075 | ret = transport_new_cmd_obj(cmd); |
4076 | if (ret < 0) | |
4077 | return ret; | |
c66ac9db | 4078 | /* |
a1d8b49a | 4079 | * For WRITEs, let the fabric know its buffer is ready.. |
c66ac9db NB |
4080 | * This WRITE struct se_cmd (and all of its associated struct se_task's) |
4081 | * will be added to the struct se_device execution queue after its WRITE | |
4082 | * data has arrived. (ie: It gets handled by the transport processing | |
4083 | * thread a second time) | |
4084 | */ | |
4085 | if (cmd->data_direction == DMA_TO_DEVICE) { | |
4086 | transport_add_tasks_to_state_queue(cmd); | |
4087 | return transport_generic_write_pending(cmd); | |
4088 | } | |
4089 | /* | |
4090 | * Everything else but a WRITE, add the struct se_cmd's struct se_task's | |
4091 | * to the execution queue. | |
4092 | */ | |
4093 | transport_execute_tasks(cmd); | |
4094 | return 0; | |
4095 | } | |
a1d8b49a | 4096 | EXPORT_SYMBOL(transport_generic_new_cmd); |
c66ac9db NB |
4097 | |
4098 | /* transport_generic_process_write(): | |
4099 | * | |
4100 | * | |
4101 | */ | |
4102 | void transport_generic_process_write(struct se_cmd *cmd) | |
4103 | { | |
c66ac9db NB |
4104 | transport_execute_tasks(cmd); |
4105 | } | |
4106 | EXPORT_SYMBOL(transport_generic_process_write); | |
4107 | ||
e057f533 | 4108 | static void transport_write_pending_qf(struct se_cmd *cmd) |
07bde79a | 4109 | { |
e057f533 CH |
4110 | if (cmd->se_tfo->write_pending(cmd) == -EAGAIN) { |
4111 | pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", | |
4112 | cmd); | |
4113 | transport_handle_queue_full(cmd, cmd->se_dev); | |
4114 | } | |
07bde79a NB |
4115 | } |
4116 | ||
c66ac9db NB |
4117 | static int transport_generic_write_pending(struct se_cmd *cmd) |
4118 | { | |
4119 | unsigned long flags; | |
4120 | int ret; | |
4121 | ||
a1d8b49a | 4122 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 4123 | cmd->t_state = TRANSPORT_WRITE_PENDING; |
a1d8b49a | 4124 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
07bde79a | 4125 | |
c66ac9db NB |
4126 | /* |
4127 | * Clear the se_cmd for WRITE_PENDING status in order to set | |
a1d8b49a | 4128 | * cmd->t_transport_active=0 so that transport_generic_handle_data |
c66ac9db | 4129 | * can be called from HW target mode interrupt code. This is safe |
e3d6f909 | 4130 | * to be called with transport_off=1 before the cmd->se_tfo->write_pending |
c66ac9db NB |
4131 | * because the se_cmd->se_lun pointer is not being cleared. |
4132 | */ | |
4133 | transport_cmd_check_stop(cmd, 1, 0); | |
4134 | ||
4135 | /* | |
4136 | * Call the fabric write_pending function here to let the | |
4137 | * frontend know that WRITE buffers are ready. | |
4138 | */ | |
e3d6f909 | 4139 | ret = cmd->se_tfo->write_pending(cmd); |
07bde79a NB |
4140 | if (ret == -EAGAIN) |
4141 | goto queue_full; | |
4142 | else if (ret < 0) | |
c66ac9db NB |
4143 | return ret; |
4144 | ||
4145 | return PYX_TRANSPORT_WRITE_PENDING; | |
07bde79a NB |
4146 | |
4147 | queue_full: | |
6708bb27 | 4148 | pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd); |
07bde79a | 4149 | cmd->t_state = TRANSPORT_COMPLETE_QF_WP; |
e057f533 | 4150 | transport_handle_queue_full(cmd, cmd->se_dev); |
07bde79a | 4151 | return ret; |
c66ac9db NB |
4152 | } |
4153 | ||
2dbc43d2 CH |
4154 | /** |
4155 | * transport_release_cmd - free a command | |
4156 | * @cmd: command to free | |
4157 | * | |
4158 | * This routine unconditionally frees a command, and reference counting | |
4159 | * or list removal must be done in the caller. | |
4160 | */ | |
35462975 | 4161 | void transport_release_cmd(struct se_cmd *cmd) |
c66ac9db | 4162 | { |
e3d6f909 | 4163 | BUG_ON(!cmd->se_tfo); |
c66ac9db | 4164 | |
2dbc43d2 CH |
4165 | if (cmd->se_tmr_req) |
4166 | core_tmr_release_req(cmd->se_tmr_req); | |
4167 | if (cmd->t_task_cdb != cmd->__t_task_cdb) | |
4168 | kfree(cmd->t_task_cdb); | |
35462975 | 4169 | cmd->se_tfo->release_cmd(cmd); |
c66ac9db | 4170 | } |
35462975 | 4171 | EXPORT_SYMBOL(transport_release_cmd); |
c66ac9db | 4172 | |
39c05f32 | 4173 | void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks) |
c66ac9db | 4174 | { |
d14921d6 NB |
4175 | if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) { |
4176 | if (wait_for_tasks && cmd->se_tmr_req) | |
4177 | transport_wait_for_tasks(cmd); | |
4178 | ||
35462975 | 4179 | transport_release_cmd(cmd); |
d14921d6 NB |
4180 | } else { |
4181 | if (wait_for_tasks) | |
4182 | transport_wait_for_tasks(cmd); | |
4183 | ||
c66ac9db NB |
4184 | core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd); |
4185 | ||
82f1c8a4 | 4186 | if (cmd->se_lun) |
c66ac9db | 4187 | transport_lun_remove_cmd(cmd); |
c66ac9db | 4188 | |
f4366772 NB |
4189 | transport_free_dev_tasks(cmd); |
4190 | ||
39c05f32 | 4191 | transport_put_cmd(cmd); |
c66ac9db NB |
4192 | } |
4193 | } | |
4194 | EXPORT_SYMBOL(transport_generic_free_cmd); | |
4195 | ||
c66ac9db NB |
4196 | /* transport_lun_wait_for_tasks(): |
4197 | * | |
4198 | * Called from ConfigFS context to stop the passed struct se_cmd to allow | |
4199 | * an struct se_lun to be successfully shutdown. | |
4200 | */ | |
4201 | static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun) | |
4202 | { | |
4203 | unsigned long flags; | |
4204 | int ret; | |
4205 | /* | |
4206 | * If the frontend has already requested this struct se_cmd to | |
4207 | * be stopped, we can safely ignore this struct se_cmd. | |
4208 | */ | |
a1d8b49a AG |
4209 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
4210 | if (atomic_read(&cmd->t_transport_stop)) { | |
4211 | atomic_set(&cmd->transport_lun_stop, 0); | |
6708bb27 | 4212 | pr_debug("ConfigFS ITT[0x%08x] - t_transport_stop ==" |
e3d6f909 | 4213 | " TRUE, skipping\n", cmd->se_tfo->get_task_tag(cmd)); |
a1d8b49a | 4214 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 4215 | transport_cmd_check_stop(cmd, 1, 0); |
e3d6f909 | 4216 | return -EPERM; |
c66ac9db | 4217 | } |
a1d8b49a AG |
4218 | atomic_set(&cmd->transport_lun_fe_stop, 1); |
4219 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
c66ac9db | 4220 | |
5951146d | 4221 | wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq); |
c66ac9db NB |
4222 | |
4223 | ret = transport_stop_tasks_for_cmd(cmd); | |
4224 | ||
6708bb27 AG |
4225 | pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:" |
4226 | " %d\n", cmd, cmd->t_task_list_num, ret); | |
c66ac9db | 4227 | if (!ret) { |
6708bb27 | 4228 | pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n", |
e3d6f909 | 4229 | cmd->se_tfo->get_task_tag(cmd)); |
a1d8b49a | 4230 | wait_for_completion(&cmd->transport_lun_stop_comp); |
6708bb27 | 4231 | pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n", |
e3d6f909 | 4232 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 4233 | } |
3df8d40b | 4234 | transport_remove_cmd_from_queue(cmd); |
c66ac9db NB |
4235 | |
4236 | return 0; | |
4237 | } | |
4238 | ||
c66ac9db NB |
4239 | static void __transport_clear_lun_from_sessions(struct se_lun *lun) |
4240 | { | |
4241 | struct se_cmd *cmd = NULL; | |
4242 | unsigned long lun_flags, cmd_flags; | |
4243 | /* | |
4244 | * Do exception processing and return CHECK_CONDITION status to the | |
4245 | * Initiator Port. | |
4246 | */ | |
4247 | spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags); | |
5951146d AG |
4248 | while (!list_empty(&lun->lun_cmd_list)) { |
4249 | cmd = list_first_entry(&lun->lun_cmd_list, | |
4250 | struct se_cmd, se_lun_node); | |
4251 | list_del(&cmd->se_lun_node); | |
4252 | ||
a1d8b49a | 4253 | atomic_set(&cmd->transport_lun_active, 0); |
c66ac9db NB |
4254 | /* |
4255 | * This will notify iscsi_target_transport.c: | |
4256 | * transport_cmd_check_stop() that a LUN shutdown is in | |
4257 | * progress for the iscsi_cmd_t. | |
4258 | */ | |
a1d8b49a | 4259 | spin_lock(&cmd->t_state_lock); |
6708bb27 | 4260 | pr_debug("SE_LUN[%d] - Setting cmd->transport" |
c66ac9db | 4261 | "_lun_stop for ITT: 0x%08x\n", |
e3d6f909 AG |
4262 | cmd->se_lun->unpacked_lun, |
4263 | cmd->se_tfo->get_task_tag(cmd)); | |
a1d8b49a AG |
4264 | atomic_set(&cmd->transport_lun_stop, 1); |
4265 | spin_unlock(&cmd->t_state_lock); | |
c66ac9db NB |
4266 | |
4267 | spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags); | |
4268 | ||
6708bb27 AG |
4269 | if (!cmd->se_lun) { |
4270 | pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n", | |
e3d6f909 AG |
4271 | cmd->se_tfo->get_task_tag(cmd), |
4272 | cmd->se_tfo->get_cmd_state(cmd), cmd->t_state); | |
c66ac9db NB |
4273 | BUG(); |
4274 | } | |
4275 | /* | |
4276 | * If the Storage engine still owns the iscsi_cmd_t, determine | |
4277 | * and/or stop its context. | |
4278 | */ | |
6708bb27 | 4279 | pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport" |
e3d6f909 AG |
4280 | "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun, |
4281 | cmd->se_tfo->get_task_tag(cmd)); | |
c66ac9db | 4282 | |
e3d6f909 | 4283 | if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) { |
c66ac9db NB |
4284 | spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags); |
4285 | continue; | |
4286 | } | |
4287 | ||
6708bb27 | 4288 | pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun" |
c66ac9db | 4289 | "_wait_for_tasks(): SUCCESS\n", |
e3d6f909 AG |
4290 | cmd->se_lun->unpacked_lun, |
4291 | cmd->se_tfo->get_task_tag(cmd)); | |
c66ac9db | 4292 | |
a1d8b49a | 4293 | spin_lock_irqsave(&cmd->t_state_lock, cmd_flags); |
6708bb27 | 4294 | if (!atomic_read(&cmd->transport_dev_active)) { |
a1d8b49a | 4295 | spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags); |
c66ac9db NB |
4296 | goto check_cond; |
4297 | } | |
a1d8b49a | 4298 | atomic_set(&cmd->transport_dev_active, 0); |
c66ac9db | 4299 | transport_all_task_dev_remove_state(cmd); |
a1d8b49a | 4300 | spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags); |
c66ac9db NB |
4301 | |
4302 | transport_free_dev_tasks(cmd); | |
4303 | /* | |
4304 | * The Storage engine stopped this struct se_cmd before it was | |
4305 | * send to the fabric frontend for delivery back to the | |
4306 | * Initiator Node. Return this SCSI CDB back with an | |
4307 | * CHECK_CONDITION status. | |
4308 | */ | |
4309 | check_cond: | |
4310 | transport_send_check_condition_and_sense(cmd, | |
4311 | TCM_NON_EXISTENT_LUN, 0); | |
4312 | /* | |
4313 | * If the fabric frontend is waiting for this iscsi_cmd_t to | |
4314 | * be released, notify the waiting thread now that LU has | |
4315 | * finished accessing it. | |
4316 | */ | |
a1d8b49a AG |
4317 | spin_lock_irqsave(&cmd->t_state_lock, cmd_flags); |
4318 | if (atomic_read(&cmd->transport_lun_fe_stop)) { | |
6708bb27 | 4319 | pr_debug("SE_LUN[%d] - Detected FE stop for" |
c66ac9db NB |
4320 | " struct se_cmd: %p ITT: 0x%08x\n", |
4321 | lun->unpacked_lun, | |
e3d6f909 | 4322 | cmd, cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 4323 | |
a1d8b49a | 4324 | spin_unlock_irqrestore(&cmd->t_state_lock, |
c66ac9db NB |
4325 | cmd_flags); |
4326 | transport_cmd_check_stop(cmd, 1, 0); | |
a1d8b49a | 4327 | complete(&cmd->transport_lun_fe_stop_comp); |
c66ac9db NB |
4328 | spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags); |
4329 | continue; | |
4330 | } | |
6708bb27 | 4331 | pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n", |
e3d6f909 | 4332 | lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 4333 | |
a1d8b49a | 4334 | spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags); |
c66ac9db NB |
4335 | spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags); |
4336 | } | |
4337 | spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags); | |
4338 | } | |
4339 | ||
4340 | static int transport_clear_lun_thread(void *p) | |
4341 | { | |
4342 | struct se_lun *lun = (struct se_lun *)p; | |
4343 | ||
4344 | __transport_clear_lun_from_sessions(lun); | |
4345 | complete(&lun->lun_shutdown_comp); | |
4346 | ||
4347 | return 0; | |
4348 | } | |
4349 | ||
4350 | int transport_clear_lun_from_sessions(struct se_lun *lun) | |
4351 | { | |
4352 | struct task_struct *kt; | |
4353 | ||
5951146d | 4354 | kt = kthread_run(transport_clear_lun_thread, lun, |
c66ac9db NB |
4355 | "tcm_cl_%u", lun->unpacked_lun); |
4356 | if (IS_ERR(kt)) { | |
6708bb27 | 4357 | pr_err("Unable to start clear_lun thread\n"); |
e3d6f909 | 4358 | return PTR_ERR(kt); |
c66ac9db NB |
4359 | } |
4360 | wait_for_completion(&lun->lun_shutdown_comp); | |
4361 | ||
4362 | return 0; | |
4363 | } | |
4364 | ||
d14921d6 NB |
4365 | /** |
4366 | * transport_wait_for_tasks - wait for completion to occur | |
4367 | * @cmd: command to wait | |
c66ac9db | 4368 | * |
d14921d6 NB |
4369 | * Called from frontend fabric context to wait for storage engine |
4370 | * to pause and/or release frontend generated struct se_cmd. | |
c66ac9db | 4371 | */ |
d14921d6 | 4372 | void transport_wait_for_tasks(struct se_cmd *cmd) |
c66ac9db NB |
4373 | { |
4374 | unsigned long flags; | |
4375 | ||
a1d8b49a | 4376 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
d14921d6 NB |
4377 | if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && !(cmd->se_tmr_req)) { |
4378 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
4379 | return; | |
4380 | } | |
4381 | /* | |
4382 | * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE | |
4383 | * has been set in transport_set_supported_SAM_opcode(). | |
4384 | */ | |
4385 | if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) && !cmd->se_tmr_req) { | |
4386 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
4387 | return; | |
4388 | } | |
c66ac9db NB |
4389 | /* |
4390 | * If we are already stopped due to an external event (ie: LUN shutdown) | |
4391 | * sleep until the connection can have the passed struct se_cmd back. | |
a1d8b49a | 4392 | * The cmd->transport_lun_stopped_sem will be upped by |
c66ac9db NB |
4393 | * transport_clear_lun_from_sessions() once the ConfigFS context caller |
4394 | * has completed its operation on the struct se_cmd. | |
4395 | */ | |
a1d8b49a | 4396 | if (atomic_read(&cmd->transport_lun_stop)) { |
c66ac9db | 4397 | |
6708bb27 | 4398 | pr_debug("wait_for_tasks: Stopping" |
e3d6f909 | 4399 | " wait_for_completion(&cmd->t_tasktransport_lun_fe" |
c66ac9db | 4400 | "_stop_comp); for ITT: 0x%08x\n", |
e3d6f909 | 4401 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db NB |
4402 | /* |
4403 | * There is a special case for WRITES where a FE exception + | |
4404 | * LUN shutdown means ConfigFS context is still sleeping on | |
4405 | * transport_lun_stop_comp in transport_lun_wait_for_tasks(). | |
4406 | * We go ahead and up transport_lun_stop_comp just to be sure | |
4407 | * here. | |
4408 | */ | |
a1d8b49a AG |
4409 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
4410 | complete(&cmd->transport_lun_stop_comp); | |
4411 | wait_for_completion(&cmd->transport_lun_fe_stop_comp); | |
4412 | spin_lock_irqsave(&cmd->t_state_lock, flags); | |
c66ac9db NB |
4413 | |
4414 | transport_all_task_dev_remove_state(cmd); | |
4415 | /* | |
4416 | * At this point, the frontend who was the originator of this | |
4417 | * struct se_cmd, now owns the structure and can be released through | |
4418 | * normal means below. | |
4419 | */ | |
6708bb27 | 4420 | pr_debug("wait_for_tasks: Stopped" |
e3d6f909 | 4421 | " wait_for_completion(&cmd->t_tasktransport_lun_fe_" |
c66ac9db | 4422 | "stop_comp); for ITT: 0x%08x\n", |
e3d6f909 | 4423 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 4424 | |
a1d8b49a | 4425 | atomic_set(&cmd->transport_lun_stop, 0); |
c66ac9db | 4426 | } |
a1d8b49a | 4427 | if (!atomic_read(&cmd->t_transport_active) || |
d14921d6 NB |
4428 | atomic_read(&cmd->t_transport_aborted)) { |
4429 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
4430 | return; | |
4431 | } | |
c66ac9db | 4432 | |
a1d8b49a | 4433 | atomic_set(&cmd->t_transport_stop, 1); |
c66ac9db | 4434 | |
6708bb27 | 4435 | pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x" |
c66ac9db | 4436 | " i_state: %d, t_state/def_t_state: %d/%d, t_transport_stop" |
e3d6f909 AG |
4437 | " = TRUE\n", cmd, cmd->se_tfo->get_task_tag(cmd), |
4438 | cmd->se_tfo->get_cmd_state(cmd), cmd->t_state, | |
c66ac9db NB |
4439 | cmd->deferred_t_state); |
4440 | ||
a1d8b49a | 4441 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 4442 | |
5951146d | 4443 | wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq); |
c66ac9db | 4444 | |
a1d8b49a | 4445 | wait_for_completion(&cmd->t_transport_stop_comp); |
c66ac9db | 4446 | |
a1d8b49a AG |
4447 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
4448 | atomic_set(&cmd->t_transport_active, 0); | |
4449 | atomic_set(&cmd->t_transport_stop, 0); | |
c66ac9db | 4450 | |
6708bb27 | 4451 | pr_debug("wait_for_tasks: Stopped wait_for_compltion(" |
a1d8b49a | 4452 | "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n", |
e3d6f909 | 4453 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 4454 | |
d14921d6 | 4455 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 4456 | } |
d14921d6 | 4457 | EXPORT_SYMBOL(transport_wait_for_tasks); |
c66ac9db NB |
4458 | |
4459 | static int transport_get_sense_codes( | |
4460 | struct se_cmd *cmd, | |
4461 | u8 *asc, | |
4462 | u8 *ascq) | |
4463 | { | |
4464 | *asc = cmd->scsi_asc; | |
4465 | *ascq = cmd->scsi_ascq; | |
4466 | ||
4467 | return 0; | |
4468 | } | |
4469 | ||
4470 | static int transport_set_sense_codes( | |
4471 | struct se_cmd *cmd, | |
4472 | u8 asc, | |
4473 | u8 ascq) | |
4474 | { | |
4475 | cmd->scsi_asc = asc; | |
4476 | cmd->scsi_ascq = ascq; | |
4477 | ||
4478 | return 0; | |
4479 | } | |
4480 | ||
4481 | int transport_send_check_condition_and_sense( | |
4482 | struct se_cmd *cmd, | |
4483 | u8 reason, | |
4484 | int from_transport) | |
4485 | { | |
4486 | unsigned char *buffer = cmd->sense_buffer; | |
4487 | unsigned long flags; | |
4488 | int offset; | |
4489 | u8 asc = 0, ascq = 0; | |
4490 | ||
a1d8b49a | 4491 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 4492 | if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) { |
a1d8b49a | 4493 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
4494 | return 0; |
4495 | } | |
4496 | cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION; | |
a1d8b49a | 4497 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
4498 | |
4499 | if (!reason && from_transport) | |
4500 | goto after_reason; | |
4501 | ||
4502 | if (!from_transport) | |
4503 | cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE; | |
4504 | /* | |
4505 | * Data Segment and SenseLength of the fabric response PDU. | |
4506 | * | |
4507 | * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE | |
4508 | * from include/scsi/scsi_cmnd.h | |
4509 | */ | |
e3d6f909 | 4510 | offset = cmd->se_tfo->set_fabric_sense_len(cmd, |
c66ac9db NB |
4511 | TRANSPORT_SENSE_BUFFER); |
4512 | /* | |
4513 | * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses | |
4514 | * SENSE KEY values from include/scsi/scsi.h | |
4515 | */ | |
4516 | switch (reason) { | |
4517 | case TCM_NON_EXISTENT_LUN: | |
eb39d340 NB |
4518 | /* CURRENT ERROR */ |
4519 | buffer[offset] = 0x70; | |
4520 | /* ILLEGAL REQUEST */ | |
4521 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; | |
4522 | /* LOGICAL UNIT NOT SUPPORTED */ | |
4523 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25; | |
4524 | break; | |
c66ac9db NB |
4525 | case TCM_UNSUPPORTED_SCSI_OPCODE: |
4526 | case TCM_SECTOR_COUNT_TOO_MANY: | |
4527 | /* CURRENT ERROR */ | |
4528 | buffer[offset] = 0x70; | |
4529 | /* ILLEGAL REQUEST */ | |
4530 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; | |
4531 | /* INVALID COMMAND OPERATION CODE */ | |
4532 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20; | |
4533 | break; | |
4534 | case TCM_UNKNOWN_MODE_PAGE: | |
4535 | /* CURRENT ERROR */ | |
4536 | buffer[offset] = 0x70; | |
4537 | /* ILLEGAL REQUEST */ | |
4538 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; | |
4539 | /* INVALID FIELD IN CDB */ | |
4540 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24; | |
4541 | break; | |
4542 | case TCM_CHECK_CONDITION_ABORT_CMD: | |
4543 | /* CURRENT ERROR */ | |
4544 | buffer[offset] = 0x70; | |
4545 | /* ABORTED COMMAND */ | |
4546 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; | |
4547 | /* BUS DEVICE RESET FUNCTION OCCURRED */ | |
4548 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29; | |
4549 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03; | |
4550 | break; | |
4551 | case TCM_INCORRECT_AMOUNT_OF_DATA: | |
4552 | /* CURRENT ERROR */ | |
4553 | buffer[offset] = 0x70; | |
4554 | /* ABORTED COMMAND */ | |
4555 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; | |
4556 | /* WRITE ERROR */ | |
4557 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c; | |
4558 | /* NOT ENOUGH UNSOLICITED DATA */ | |
4559 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d; | |
4560 | break; | |
4561 | case TCM_INVALID_CDB_FIELD: | |
4562 | /* CURRENT ERROR */ | |
4563 | buffer[offset] = 0x70; | |
4564 | /* ABORTED COMMAND */ | |
4565 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; | |
4566 | /* INVALID FIELD IN CDB */ | |
4567 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24; | |
4568 | break; | |
4569 | case TCM_INVALID_PARAMETER_LIST: | |
4570 | /* CURRENT ERROR */ | |
4571 | buffer[offset] = 0x70; | |
4572 | /* ABORTED COMMAND */ | |
4573 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; | |
4574 | /* INVALID FIELD IN PARAMETER LIST */ | |
4575 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26; | |
4576 | break; | |
4577 | case TCM_UNEXPECTED_UNSOLICITED_DATA: | |
4578 | /* CURRENT ERROR */ | |
4579 | buffer[offset] = 0x70; | |
4580 | /* ABORTED COMMAND */ | |
4581 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; | |
4582 | /* WRITE ERROR */ | |
4583 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c; | |
4584 | /* UNEXPECTED_UNSOLICITED_DATA */ | |
4585 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c; | |
4586 | break; | |
4587 | case TCM_SERVICE_CRC_ERROR: | |
4588 | /* CURRENT ERROR */ | |
4589 | buffer[offset] = 0x70; | |
4590 | /* ABORTED COMMAND */ | |
4591 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; | |
4592 | /* PROTOCOL SERVICE CRC ERROR */ | |
4593 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47; | |
4594 | /* N/A */ | |
4595 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05; | |
4596 | break; | |
4597 | case TCM_SNACK_REJECTED: | |
4598 | /* CURRENT ERROR */ | |
4599 | buffer[offset] = 0x70; | |
4600 | /* ABORTED COMMAND */ | |
4601 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; | |
4602 | /* READ ERROR */ | |
4603 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11; | |
4604 | /* FAILED RETRANSMISSION REQUEST */ | |
4605 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13; | |
4606 | break; | |
4607 | case TCM_WRITE_PROTECTED: | |
4608 | /* CURRENT ERROR */ | |
4609 | buffer[offset] = 0x70; | |
4610 | /* DATA PROTECT */ | |
4611 | buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT; | |
4612 | /* WRITE PROTECTED */ | |
4613 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27; | |
4614 | break; | |
4615 | case TCM_CHECK_CONDITION_UNIT_ATTENTION: | |
4616 | /* CURRENT ERROR */ | |
4617 | buffer[offset] = 0x70; | |
4618 | /* UNIT ATTENTION */ | |
4619 | buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION; | |
4620 | core_scsi3_ua_for_check_condition(cmd, &asc, &ascq); | |
4621 | buffer[offset+SPC_ASC_KEY_OFFSET] = asc; | |
4622 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq; | |
4623 | break; | |
4624 | case TCM_CHECK_CONDITION_NOT_READY: | |
4625 | /* CURRENT ERROR */ | |
4626 | buffer[offset] = 0x70; | |
4627 | /* Not Ready */ | |
4628 | buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY; | |
4629 | transport_get_sense_codes(cmd, &asc, &ascq); | |
4630 | buffer[offset+SPC_ASC_KEY_OFFSET] = asc; | |
4631 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq; | |
4632 | break; | |
4633 | case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE: | |
4634 | default: | |
4635 | /* CURRENT ERROR */ | |
4636 | buffer[offset] = 0x70; | |
4637 | /* ILLEGAL REQUEST */ | |
4638 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; | |
4639 | /* LOGICAL UNIT COMMUNICATION FAILURE */ | |
4640 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80; | |
4641 | break; | |
4642 | } | |
4643 | /* | |
4644 | * This code uses linux/include/scsi/scsi.h SAM status codes! | |
4645 | */ | |
4646 | cmd->scsi_status = SAM_STAT_CHECK_CONDITION; | |
4647 | /* | |
4648 | * Automatically padded, this value is encoded in the fabric's | |
4649 | * data_length response PDU containing the SCSI defined sense data. | |
4650 | */ | |
4651 | cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset; | |
4652 | ||
4653 | after_reason: | |
07bde79a | 4654 | return cmd->se_tfo->queue_status(cmd); |
c66ac9db NB |
4655 | } |
4656 | EXPORT_SYMBOL(transport_send_check_condition_and_sense); | |
4657 | ||
4658 | int transport_check_aborted_status(struct se_cmd *cmd, int send_status) | |
4659 | { | |
4660 | int ret = 0; | |
4661 | ||
a1d8b49a | 4662 | if (atomic_read(&cmd->t_transport_aborted) != 0) { |
6708bb27 | 4663 | if (!send_status || |
c66ac9db NB |
4664 | (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS)) |
4665 | return 1; | |
4666 | #if 0 | |
6708bb27 | 4667 | pr_debug("Sending delayed SAM_STAT_TASK_ABORTED" |
c66ac9db | 4668 | " status for CDB: 0x%02x ITT: 0x%08x\n", |
a1d8b49a | 4669 | cmd->t_task_cdb[0], |
e3d6f909 | 4670 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db NB |
4671 | #endif |
4672 | cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS; | |
e3d6f909 | 4673 | cmd->se_tfo->queue_status(cmd); |
c66ac9db NB |
4674 | ret = 1; |
4675 | } | |
4676 | return ret; | |
4677 | } | |
4678 | EXPORT_SYMBOL(transport_check_aborted_status); | |
4679 | ||
4680 | void transport_send_task_abort(struct se_cmd *cmd) | |
4681 | { | |
c252f003 NB |
4682 | unsigned long flags; |
4683 | ||
4684 | spin_lock_irqsave(&cmd->t_state_lock, flags); | |
4685 | if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) { | |
4686 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
4687 | return; | |
4688 | } | |
4689 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
4690 | ||
c66ac9db NB |
4691 | /* |
4692 | * If there are still expected incoming fabric WRITEs, we wait | |
4693 | * until until they have completed before sending a TASK_ABORTED | |
4694 | * response. This response with TASK_ABORTED status will be | |
4695 | * queued back to fabric module by transport_check_aborted_status(). | |
4696 | */ | |
4697 | if (cmd->data_direction == DMA_TO_DEVICE) { | |
e3d6f909 | 4698 | if (cmd->se_tfo->write_pending_status(cmd) != 0) { |
a1d8b49a | 4699 | atomic_inc(&cmd->t_transport_aborted); |
c66ac9db NB |
4700 | smp_mb__after_atomic_inc(); |
4701 | cmd->scsi_status = SAM_STAT_TASK_ABORTED; | |
4702 | transport_new_cmd_failure(cmd); | |
4703 | return; | |
4704 | } | |
4705 | } | |
4706 | cmd->scsi_status = SAM_STAT_TASK_ABORTED; | |
4707 | #if 0 | |
6708bb27 | 4708 | pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x," |
a1d8b49a | 4709 | " ITT: 0x%08x\n", cmd->t_task_cdb[0], |
e3d6f909 | 4710 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 4711 | #endif |
e3d6f909 | 4712 | cmd->se_tfo->queue_status(cmd); |
c66ac9db NB |
4713 | } |
4714 | ||
4715 | /* transport_generic_do_tmr(): | |
4716 | * | |
4717 | * | |
4718 | */ | |
4719 | int transport_generic_do_tmr(struct se_cmd *cmd) | |
4720 | { | |
5951146d | 4721 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
4722 | struct se_tmr_req *tmr = cmd->se_tmr_req; |
4723 | int ret; | |
4724 | ||
4725 | switch (tmr->function) { | |
5c6cd613 | 4726 | case TMR_ABORT_TASK: |
c66ac9db NB |
4727 | tmr->response = TMR_FUNCTION_REJECTED; |
4728 | break; | |
5c6cd613 NB |
4729 | case TMR_ABORT_TASK_SET: |
4730 | case TMR_CLEAR_ACA: | |
4731 | case TMR_CLEAR_TASK_SET: | |
c66ac9db NB |
4732 | tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED; |
4733 | break; | |
5c6cd613 | 4734 | case TMR_LUN_RESET: |
c66ac9db NB |
4735 | ret = core_tmr_lun_reset(dev, tmr, NULL, NULL); |
4736 | tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE : | |
4737 | TMR_FUNCTION_REJECTED; | |
4738 | break; | |
5c6cd613 | 4739 | case TMR_TARGET_WARM_RESET: |
c66ac9db NB |
4740 | tmr->response = TMR_FUNCTION_REJECTED; |
4741 | break; | |
5c6cd613 | 4742 | case TMR_TARGET_COLD_RESET: |
c66ac9db NB |
4743 | tmr->response = TMR_FUNCTION_REJECTED; |
4744 | break; | |
c66ac9db | 4745 | default: |
6708bb27 | 4746 | pr_err("Uknown TMR function: 0x%02x.\n", |
c66ac9db NB |
4747 | tmr->function); |
4748 | tmr->response = TMR_FUNCTION_REJECTED; | |
4749 | break; | |
4750 | } | |
4751 | ||
4752 | cmd->t_state = TRANSPORT_ISTATE_PROCESSING; | |
e3d6f909 | 4753 | cmd->se_tfo->queue_tm_rsp(cmd); |
c66ac9db NB |
4754 | |
4755 | transport_cmd_check_stop(cmd, 2, 0); | |
4756 | return 0; | |
4757 | } | |
4758 | ||
c66ac9db NB |
4759 | /* transport_processing_thread(): |
4760 | * | |
4761 | * | |
4762 | */ | |
4763 | static int transport_processing_thread(void *param) | |
4764 | { | |
5951146d | 4765 | int ret; |
c66ac9db NB |
4766 | struct se_cmd *cmd; |
4767 | struct se_device *dev = (struct se_device *) param; | |
c66ac9db NB |
4768 | |
4769 | set_user_nice(current, -20); | |
4770 | ||
4771 | while (!kthread_should_stop()) { | |
e3d6f909 AG |
4772 | ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq, |
4773 | atomic_read(&dev->dev_queue_obj.queue_cnt) || | |
c66ac9db NB |
4774 | kthread_should_stop()); |
4775 | if (ret < 0) | |
4776 | goto out; | |
4777 | ||
c66ac9db NB |
4778 | get_cmd: |
4779 | __transport_execute_tasks(dev); | |
4780 | ||
5951146d AG |
4781 | cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj); |
4782 | if (!cmd) | |
c66ac9db NB |
4783 | continue; |
4784 | ||
5951146d | 4785 | switch (cmd->t_state) { |
680b73c5 CH |
4786 | case TRANSPORT_NEW_CMD: |
4787 | BUG(); | |
4788 | break; | |
c66ac9db | 4789 | case TRANSPORT_NEW_CMD_MAP: |
6708bb27 AG |
4790 | if (!cmd->se_tfo->new_cmd_map) { |
4791 | pr_err("cmd->se_tfo->new_cmd_map is" | |
c66ac9db NB |
4792 | " NULL for TRANSPORT_NEW_CMD_MAP\n"); |
4793 | BUG(); | |
4794 | } | |
e3d6f909 | 4795 | ret = cmd->se_tfo->new_cmd_map(cmd); |
c66ac9db NB |
4796 | if (ret < 0) { |
4797 | cmd->transport_error_status = ret; | |
4798 | transport_generic_request_failure(cmd, NULL, | |
4799 | 0, (cmd->data_direction != | |
4800 | DMA_TO_DEVICE)); | |
4801 | break; | |
4802 | } | |
c66ac9db | 4803 | ret = transport_generic_new_cmd(cmd); |
07bde79a NB |
4804 | if (ret == -EAGAIN) |
4805 | break; | |
4806 | else if (ret < 0) { | |
c66ac9db NB |
4807 | cmd->transport_error_status = ret; |
4808 | transport_generic_request_failure(cmd, NULL, | |
4809 | 0, (cmd->data_direction != | |
4810 | DMA_TO_DEVICE)); | |
4811 | } | |
4812 | break; | |
4813 | case TRANSPORT_PROCESS_WRITE: | |
4814 | transport_generic_process_write(cmd); | |
4815 | break; | |
4816 | case TRANSPORT_COMPLETE_OK: | |
4817 | transport_stop_all_task_timers(cmd); | |
4818 | transport_generic_complete_ok(cmd); | |
4819 | break; | |
4820 | case TRANSPORT_REMOVE: | |
e6a2573f | 4821 | transport_put_cmd(cmd); |
c66ac9db | 4822 | break; |
f4366772 | 4823 | case TRANSPORT_FREE_CMD_INTR: |
82f1c8a4 | 4824 | transport_generic_free_cmd(cmd, 0); |
f4366772 | 4825 | break; |
c66ac9db NB |
4826 | case TRANSPORT_PROCESS_TMR: |
4827 | transport_generic_do_tmr(cmd); | |
4828 | break; | |
4829 | case TRANSPORT_COMPLETE_FAILURE: | |
4830 | transport_generic_request_failure(cmd, NULL, 1, 1); | |
4831 | break; | |
4832 | case TRANSPORT_COMPLETE_TIMEOUT: | |
4833 | transport_stop_all_task_timers(cmd); | |
4834 | transport_generic_request_timeout(cmd); | |
4835 | break; | |
07bde79a | 4836 | case TRANSPORT_COMPLETE_QF_WP: |
e057f533 CH |
4837 | transport_write_pending_qf(cmd); |
4838 | break; | |
4839 | case TRANSPORT_COMPLETE_QF_OK: | |
4840 | transport_complete_qf(cmd); | |
07bde79a | 4841 | break; |
c66ac9db | 4842 | default: |
6708bb27 | 4843 | pr_err("Unknown t_state: %d deferred_t_state:" |
c66ac9db | 4844 | " %d for ITT: 0x%08x i_state: %d on SE LUN:" |
5951146d | 4845 | " %u\n", cmd->t_state, cmd->deferred_t_state, |
e3d6f909 AG |
4846 | cmd->se_tfo->get_task_tag(cmd), |
4847 | cmd->se_tfo->get_cmd_state(cmd), | |
4848 | cmd->se_lun->unpacked_lun); | |
c66ac9db NB |
4849 | BUG(); |
4850 | } | |
4851 | ||
4852 | goto get_cmd; | |
4853 | } | |
4854 | ||
4855 | out: | |
ce8762f6 NB |
4856 | WARN_ON(!list_empty(&dev->state_task_list)); |
4857 | WARN_ON(!list_empty(&dev->dev_queue_obj.qobj_list)); | |
c66ac9db NB |
4858 | dev->process_thread = NULL; |
4859 | return 0; | |
4860 | } |