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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); |
c66ac9db NB |
85 | static void transport_remove_cmd_from_queue(struct se_cmd *cmd, |
86 | struct se_queue_obj *qobj); | |
87 | static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq); | |
88 | static void transport_stop_all_task_timers(struct se_cmd *cmd); | |
89 | ||
e3d6f909 | 90 | int init_se_kmem_caches(void) |
c66ac9db | 91 | { |
c66ac9db NB |
92 | se_cmd_cache = kmem_cache_create("se_cmd_cache", |
93 | sizeof(struct se_cmd), __alignof__(struct se_cmd), 0, NULL); | |
6708bb27 AG |
94 | if (!se_cmd_cache) { |
95 | pr_err("kmem_cache_create for struct se_cmd failed\n"); | |
c66ac9db NB |
96 | goto out; |
97 | } | |
98 | se_tmr_req_cache = kmem_cache_create("se_tmr_cache", | |
99 | sizeof(struct se_tmr_req), __alignof__(struct se_tmr_req), | |
100 | 0, NULL); | |
6708bb27 AG |
101 | if (!se_tmr_req_cache) { |
102 | pr_err("kmem_cache_create() for struct se_tmr_req" | |
c66ac9db NB |
103 | " failed\n"); |
104 | goto out; | |
105 | } | |
106 | se_sess_cache = kmem_cache_create("se_sess_cache", | |
107 | sizeof(struct se_session), __alignof__(struct se_session), | |
108 | 0, NULL); | |
6708bb27 AG |
109 | if (!se_sess_cache) { |
110 | pr_err("kmem_cache_create() for struct se_session" | |
c66ac9db NB |
111 | " failed\n"); |
112 | goto out; | |
113 | } | |
114 | se_ua_cache = kmem_cache_create("se_ua_cache", | |
115 | sizeof(struct se_ua), __alignof__(struct se_ua), | |
116 | 0, NULL); | |
6708bb27 AG |
117 | if (!se_ua_cache) { |
118 | pr_err("kmem_cache_create() for struct se_ua failed\n"); | |
c66ac9db NB |
119 | goto out; |
120 | } | |
c66ac9db NB |
121 | t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache", |
122 | sizeof(struct t10_pr_registration), | |
123 | __alignof__(struct t10_pr_registration), 0, NULL); | |
6708bb27 AG |
124 | if (!t10_pr_reg_cache) { |
125 | pr_err("kmem_cache_create() for struct t10_pr_registration" | |
c66ac9db NB |
126 | " failed\n"); |
127 | goto out; | |
128 | } | |
129 | t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache", | |
130 | sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp), | |
131 | 0, NULL); | |
6708bb27 AG |
132 | if (!t10_alua_lu_gp_cache) { |
133 | pr_err("kmem_cache_create() for t10_alua_lu_gp_cache" | |
c66ac9db NB |
134 | " failed\n"); |
135 | goto out; | |
136 | } | |
137 | t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache", | |
138 | sizeof(struct t10_alua_lu_gp_member), | |
139 | __alignof__(struct t10_alua_lu_gp_member), 0, NULL); | |
6708bb27 AG |
140 | if (!t10_alua_lu_gp_mem_cache) { |
141 | pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_" | |
c66ac9db NB |
142 | "cache failed\n"); |
143 | goto out; | |
144 | } | |
145 | t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache", | |
146 | sizeof(struct t10_alua_tg_pt_gp), | |
147 | __alignof__(struct t10_alua_tg_pt_gp), 0, NULL); | |
6708bb27 AG |
148 | if (!t10_alua_tg_pt_gp_cache) { |
149 | pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_" | |
c66ac9db NB |
150 | "cache failed\n"); |
151 | goto out; | |
152 | } | |
153 | t10_alua_tg_pt_gp_mem_cache = kmem_cache_create( | |
154 | "t10_alua_tg_pt_gp_mem_cache", | |
155 | sizeof(struct t10_alua_tg_pt_gp_member), | |
156 | __alignof__(struct t10_alua_tg_pt_gp_member), | |
157 | 0, NULL); | |
6708bb27 AG |
158 | if (!t10_alua_tg_pt_gp_mem_cache) { |
159 | pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_" | |
c66ac9db NB |
160 | "mem_t failed\n"); |
161 | goto out; | |
162 | } | |
163 | ||
c66ac9db NB |
164 | return 0; |
165 | out: | |
166 | if (se_cmd_cache) | |
167 | kmem_cache_destroy(se_cmd_cache); | |
168 | if (se_tmr_req_cache) | |
169 | kmem_cache_destroy(se_tmr_req_cache); | |
170 | if (se_sess_cache) | |
171 | kmem_cache_destroy(se_sess_cache); | |
172 | if (se_ua_cache) | |
173 | kmem_cache_destroy(se_ua_cache); | |
c66ac9db NB |
174 | if (t10_pr_reg_cache) |
175 | kmem_cache_destroy(t10_pr_reg_cache); | |
176 | if (t10_alua_lu_gp_cache) | |
177 | kmem_cache_destroy(t10_alua_lu_gp_cache); | |
178 | if (t10_alua_lu_gp_mem_cache) | |
179 | kmem_cache_destroy(t10_alua_lu_gp_mem_cache); | |
180 | if (t10_alua_tg_pt_gp_cache) | |
181 | kmem_cache_destroy(t10_alua_tg_pt_gp_cache); | |
182 | if (t10_alua_tg_pt_gp_mem_cache) | |
183 | kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache); | |
e3d6f909 | 184 | return -ENOMEM; |
c66ac9db NB |
185 | } |
186 | ||
e3d6f909 | 187 | void release_se_kmem_caches(void) |
c66ac9db | 188 | { |
c66ac9db NB |
189 | kmem_cache_destroy(se_cmd_cache); |
190 | kmem_cache_destroy(se_tmr_req_cache); | |
191 | kmem_cache_destroy(se_sess_cache); | |
192 | kmem_cache_destroy(se_ua_cache); | |
c66ac9db NB |
193 | kmem_cache_destroy(t10_pr_reg_cache); |
194 | kmem_cache_destroy(t10_alua_lu_gp_cache); | |
195 | kmem_cache_destroy(t10_alua_lu_gp_mem_cache); | |
196 | kmem_cache_destroy(t10_alua_tg_pt_gp_cache); | |
197 | kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache); | |
c66ac9db NB |
198 | } |
199 | ||
e3d6f909 AG |
200 | /* This code ensures unique mib indexes are handed out. */ |
201 | static DEFINE_SPINLOCK(scsi_mib_index_lock); | |
202 | static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX]; | |
e89d15ee NB |
203 | |
204 | /* | |
205 | * Allocate a new row index for the entry type specified | |
206 | */ | |
207 | u32 scsi_get_new_index(scsi_index_t type) | |
208 | { | |
209 | u32 new_index; | |
210 | ||
e3d6f909 | 211 | BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX)); |
e89d15ee | 212 | |
e3d6f909 AG |
213 | spin_lock(&scsi_mib_index_lock); |
214 | new_index = ++scsi_mib_index[type]; | |
215 | spin_unlock(&scsi_mib_index_lock); | |
e89d15ee NB |
216 | |
217 | return new_index; | |
218 | } | |
219 | ||
c66ac9db NB |
220 | void transport_init_queue_obj(struct se_queue_obj *qobj) |
221 | { | |
222 | atomic_set(&qobj->queue_cnt, 0); | |
223 | INIT_LIST_HEAD(&qobj->qobj_list); | |
224 | init_waitqueue_head(&qobj->thread_wq); | |
225 | spin_lock_init(&qobj->cmd_queue_lock); | |
226 | } | |
227 | EXPORT_SYMBOL(transport_init_queue_obj); | |
228 | ||
229 | static int transport_subsystem_reqmods(void) | |
230 | { | |
231 | int ret; | |
232 | ||
233 | ret = request_module("target_core_iblock"); | |
234 | if (ret != 0) | |
6708bb27 | 235 | pr_err("Unable to load target_core_iblock\n"); |
c66ac9db NB |
236 | |
237 | ret = request_module("target_core_file"); | |
238 | if (ret != 0) | |
6708bb27 | 239 | pr_err("Unable to load target_core_file\n"); |
c66ac9db NB |
240 | |
241 | ret = request_module("target_core_pscsi"); | |
242 | if (ret != 0) | |
6708bb27 | 243 | pr_err("Unable to load target_core_pscsi\n"); |
c66ac9db NB |
244 | |
245 | ret = request_module("target_core_stgt"); | |
246 | if (ret != 0) | |
6708bb27 | 247 | pr_err("Unable to load target_core_stgt\n"); |
c66ac9db NB |
248 | |
249 | return 0; | |
250 | } | |
251 | ||
252 | int transport_subsystem_check_init(void) | |
253 | { | |
e3d6f909 AG |
254 | int ret; |
255 | ||
256 | if (sub_api_initialized) | |
c66ac9db NB |
257 | return 0; |
258 | /* | |
259 | * Request the loading of known TCM subsystem plugins.. | |
260 | */ | |
e3d6f909 AG |
261 | ret = transport_subsystem_reqmods(); |
262 | if (ret < 0) | |
263 | return ret; | |
c66ac9db | 264 | |
e3d6f909 | 265 | sub_api_initialized = 1; |
c66ac9db NB |
266 | return 0; |
267 | } | |
268 | ||
269 | struct se_session *transport_init_session(void) | |
270 | { | |
271 | struct se_session *se_sess; | |
272 | ||
273 | se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL); | |
6708bb27 AG |
274 | if (!se_sess) { |
275 | pr_err("Unable to allocate struct se_session from" | |
c66ac9db NB |
276 | " se_sess_cache\n"); |
277 | return ERR_PTR(-ENOMEM); | |
278 | } | |
279 | INIT_LIST_HEAD(&se_sess->sess_list); | |
280 | INIT_LIST_HEAD(&se_sess->sess_acl_list); | |
c66ac9db NB |
281 | |
282 | return se_sess; | |
283 | } | |
284 | EXPORT_SYMBOL(transport_init_session); | |
285 | ||
286 | /* | |
287 | * Called with spin_lock_bh(&struct se_portal_group->session_lock called. | |
288 | */ | |
289 | void __transport_register_session( | |
290 | struct se_portal_group *se_tpg, | |
291 | struct se_node_acl *se_nacl, | |
292 | struct se_session *se_sess, | |
293 | void *fabric_sess_ptr) | |
294 | { | |
295 | unsigned char buf[PR_REG_ISID_LEN]; | |
296 | ||
297 | se_sess->se_tpg = se_tpg; | |
298 | se_sess->fabric_sess_ptr = fabric_sess_ptr; | |
299 | /* | |
300 | * Used by struct se_node_acl's under ConfigFS to locate active se_session-t | |
301 | * | |
302 | * Only set for struct se_session's that will actually be moving I/O. | |
303 | * eg: *NOT* discovery sessions. | |
304 | */ | |
305 | if (se_nacl) { | |
306 | /* | |
307 | * If the fabric module supports an ISID based TransportID, | |
308 | * save this value in binary from the fabric I_T Nexus now. | |
309 | */ | |
e3d6f909 | 310 | if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { |
c66ac9db | 311 | memset(&buf[0], 0, PR_REG_ISID_LEN); |
e3d6f909 | 312 | se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, |
c66ac9db NB |
313 | &buf[0], PR_REG_ISID_LEN); |
314 | se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]); | |
315 | } | |
316 | spin_lock_irq(&se_nacl->nacl_sess_lock); | |
317 | /* | |
318 | * The se_nacl->nacl_sess pointer will be set to the | |
319 | * last active I_T Nexus for each struct se_node_acl. | |
320 | */ | |
321 | se_nacl->nacl_sess = se_sess; | |
322 | ||
323 | list_add_tail(&se_sess->sess_acl_list, | |
324 | &se_nacl->acl_sess_list); | |
325 | spin_unlock_irq(&se_nacl->nacl_sess_lock); | |
326 | } | |
327 | list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list); | |
328 | ||
6708bb27 | 329 | pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n", |
e3d6f909 | 330 | se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr); |
c66ac9db NB |
331 | } |
332 | EXPORT_SYMBOL(__transport_register_session); | |
333 | ||
334 | void transport_register_session( | |
335 | struct se_portal_group *se_tpg, | |
336 | struct se_node_acl *se_nacl, | |
337 | struct se_session *se_sess, | |
338 | void *fabric_sess_ptr) | |
339 | { | |
340 | spin_lock_bh(&se_tpg->session_lock); | |
341 | __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr); | |
342 | spin_unlock_bh(&se_tpg->session_lock); | |
343 | } | |
344 | EXPORT_SYMBOL(transport_register_session); | |
345 | ||
346 | void transport_deregister_session_configfs(struct se_session *se_sess) | |
347 | { | |
348 | struct se_node_acl *se_nacl; | |
23388864 | 349 | unsigned long flags; |
c66ac9db NB |
350 | /* |
351 | * Used by struct se_node_acl's under ConfigFS to locate active struct se_session | |
352 | */ | |
353 | se_nacl = se_sess->se_node_acl; | |
6708bb27 | 354 | if (se_nacl) { |
23388864 | 355 | spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags); |
c66ac9db NB |
356 | list_del(&se_sess->sess_acl_list); |
357 | /* | |
358 | * If the session list is empty, then clear the pointer. | |
359 | * Otherwise, set the struct se_session pointer from the tail | |
360 | * element of the per struct se_node_acl active session list. | |
361 | */ | |
362 | if (list_empty(&se_nacl->acl_sess_list)) | |
363 | se_nacl->nacl_sess = NULL; | |
364 | else { | |
365 | se_nacl->nacl_sess = container_of( | |
366 | se_nacl->acl_sess_list.prev, | |
367 | struct se_session, sess_acl_list); | |
368 | } | |
23388864 | 369 | spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags); |
c66ac9db NB |
370 | } |
371 | } | |
372 | EXPORT_SYMBOL(transport_deregister_session_configfs); | |
373 | ||
374 | void transport_free_session(struct se_session *se_sess) | |
375 | { | |
376 | kmem_cache_free(se_sess_cache, se_sess); | |
377 | } | |
378 | EXPORT_SYMBOL(transport_free_session); | |
379 | ||
380 | void transport_deregister_session(struct se_session *se_sess) | |
381 | { | |
382 | struct se_portal_group *se_tpg = se_sess->se_tpg; | |
383 | struct se_node_acl *se_nacl; | |
e63a8e19 | 384 | unsigned long flags; |
c66ac9db | 385 | |
6708bb27 | 386 | if (!se_tpg) { |
c66ac9db NB |
387 | transport_free_session(se_sess); |
388 | return; | |
389 | } | |
c66ac9db | 390 | |
e63a8e19 | 391 | spin_lock_irqsave(&se_tpg->session_lock, flags); |
c66ac9db NB |
392 | list_del(&se_sess->sess_list); |
393 | se_sess->se_tpg = NULL; | |
394 | se_sess->fabric_sess_ptr = NULL; | |
e63a8e19 | 395 | spin_unlock_irqrestore(&se_tpg->session_lock, flags); |
c66ac9db NB |
396 | |
397 | /* | |
398 | * Determine if we need to do extra work for this initiator node's | |
399 | * struct se_node_acl if it had been previously dynamically generated. | |
400 | */ | |
401 | se_nacl = se_sess->se_node_acl; | |
6708bb27 | 402 | if (se_nacl) { |
e63a8e19 | 403 | spin_lock_irqsave(&se_tpg->acl_node_lock, flags); |
c66ac9db | 404 | if (se_nacl->dynamic_node_acl) { |
6708bb27 AG |
405 | if (!se_tpg->se_tpg_tfo->tpg_check_demo_mode_cache( |
406 | se_tpg)) { | |
c66ac9db NB |
407 | list_del(&se_nacl->acl_list); |
408 | se_tpg->num_node_acls--; | |
e63a8e19 | 409 | spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags); |
c66ac9db NB |
410 | |
411 | core_tpg_wait_for_nacl_pr_ref(se_nacl); | |
c66ac9db | 412 | core_free_device_list_for_node(se_nacl, se_tpg); |
e3d6f909 | 413 | se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg, |
c66ac9db | 414 | se_nacl); |
e63a8e19 | 415 | spin_lock_irqsave(&se_tpg->acl_node_lock, flags); |
c66ac9db NB |
416 | } |
417 | } | |
e63a8e19 | 418 | spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags); |
c66ac9db NB |
419 | } |
420 | ||
421 | transport_free_session(se_sess); | |
422 | ||
6708bb27 | 423 | pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n", |
e3d6f909 | 424 | se_tpg->se_tpg_tfo->get_fabric_name()); |
c66ac9db NB |
425 | } |
426 | EXPORT_SYMBOL(transport_deregister_session); | |
427 | ||
428 | /* | |
a1d8b49a | 429 | * Called with cmd->t_state_lock held. |
c66ac9db NB |
430 | */ |
431 | static void transport_all_task_dev_remove_state(struct se_cmd *cmd) | |
432 | { | |
42bf829e | 433 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
434 | struct se_task *task; |
435 | unsigned long flags; | |
436 | ||
42bf829e CH |
437 | if (!dev) |
438 | return; | |
c66ac9db | 439 | |
42bf829e | 440 | list_for_each_entry(task, &cmd->t_task_list, t_list) { |
6c76bf95 | 441 | if (task->task_flags & TF_ACTIVE) |
c66ac9db NB |
442 | continue; |
443 | ||
6708bb27 | 444 | if (!atomic_read(&task->task_state_active)) |
c66ac9db NB |
445 | continue; |
446 | ||
447 | spin_lock_irqsave(&dev->execute_task_lock, flags); | |
448 | list_del(&task->t_state_list); | |
6708bb27 AG |
449 | pr_debug("Removed ITT: 0x%08x dev: %p task[%p]\n", |
450 | cmd->se_tfo->get_task_tag(cmd), dev, task); | |
c66ac9db NB |
451 | spin_unlock_irqrestore(&dev->execute_task_lock, flags); |
452 | ||
453 | atomic_set(&task->task_state_active, 0); | |
a1d8b49a | 454 | atomic_dec(&cmd->t_task_cdbs_ex_left); |
c66ac9db NB |
455 | } |
456 | } | |
457 | ||
458 | /* transport_cmd_check_stop(): | |
459 | * | |
460 | * 'transport_off = 1' determines if t_transport_active should be cleared. | |
461 | * 'transport_off = 2' determines if task_dev_state should be removed. | |
462 | * | |
463 | * A non-zero u8 t_state sets cmd->t_state. | |
464 | * Returns 1 when command is stopped, else 0. | |
465 | */ | |
466 | static int transport_cmd_check_stop( | |
467 | struct se_cmd *cmd, | |
468 | int transport_off, | |
469 | u8 t_state) | |
470 | { | |
471 | unsigned long flags; | |
472 | ||
a1d8b49a | 473 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db NB |
474 | /* |
475 | * Determine if IOCTL context caller in requesting the stopping of this | |
476 | * command for LUN shutdown purposes. | |
477 | */ | |
a1d8b49a | 478 | if (atomic_read(&cmd->transport_lun_stop)) { |
6708bb27 | 479 | pr_debug("%s:%d atomic_read(&cmd->transport_lun_stop)" |
c66ac9db | 480 | " == TRUE for ITT: 0x%08x\n", __func__, __LINE__, |
e3d6f909 | 481 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db NB |
482 | |
483 | cmd->deferred_t_state = cmd->t_state; | |
484 | cmd->t_state = TRANSPORT_DEFERRED_CMD; | |
a1d8b49a | 485 | atomic_set(&cmd->t_transport_active, 0); |
c66ac9db NB |
486 | if (transport_off == 2) |
487 | transport_all_task_dev_remove_state(cmd); | |
a1d8b49a | 488 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 489 | |
a1d8b49a | 490 | complete(&cmd->transport_lun_stop_comp); |
c66ac9db NB |
491 | return 1; |
492 | } | |
493 | /* | |
494 | * Determine if frontend context caller is requesting the stopping of | |
e3d6f909 | 495 | * this command for frontend exceptions. |
c66ac9db | 496 | */ |
a1d8b49a | 497 | if (atomic_read(&cmd->t_transport_stop)) { |
6708bb27 | 498 | pr_debug("%s:%d atomic_read(&cmd->t_transport_stop) ==" |
c66ac9db | 499 | " TRUE for ITT: 0x%08x\n", __func__, __LINE__, |
e3d6f909 | 500 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db NB |
501 | |
502 | cmd->deferred_t_state = cmd->t_state; | |
503 | cmd->t_state = TRANSPORT_DEFERRED_CMD; | |
504 | if (transport_off == 2) | |
505 | transport_all_task_dev_remove_state(cmd); | |
506 | ||
507 | /* | |
508 | * Clear struct se_cmd->se_lun before the transport_off == 2 handoff | |
509 | * to FE. | |
510 | */ | |
511 | if (transport_off == 2) | |
512 | cmd->se_lun = NULL; | |
a1d8b49a | 513 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 514 | |
a1d8b49a | 515 | complete(&cmd->t_transport_stop_comp); |
c66ac9db NB |
516 | return 1; |
517 | } | |
518 | if (transport_off) { | |
a1d8b49a | 519 | atomic_set(&cmd->t_transport_active, 0); |
c66ac9db NB |
520 | if (transport_off == 2) { |
521 | transport_all_task_dev_remove_state(cmd); | |
522 | /* | |
523 | * Clear struct se_cmd->se_lun before the transport_off == 2 | |
524 | * handoff to fabric module. | |
525 | */ | |
526 | cmd->se_lun = NULL; | |
527 | /* | |
528 | * Some fabric modules like tcm_loop can release | |
25985edc | 529 | * their internally allocated I/O reference now and |
c66ac9db NB |
530 | * struct se_cmd now. |
531 | */ | |
e3d6f909 | 532 | if (cmd->se_tfo->check_stop_free != NULL) { |
c66ac9db | 533 | spin_unlock_irqrestore( |
a1d8b49a | 534 | &cmd->t_state_lock, flags); |
c66ac9db | 535 | |
e3d6f909 | 536 | cmd->se_tfo->check_stop_free(cmd); |
c66ac9db NB |
537 | return 1; |
538 | } | |
539 | } | |
a1d8b49a | 540 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
541 | |
542 | return 0; | |
543 | } else if (t_state) | |
544 | cmd->t_state = t_state; | |
a1d8b49a | 545 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
546 | |
547 | return 0; | |
548 | } | |
549 | ||
550 | static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd) | |
551 | { | |
552 | return transport_cmd_check_stop(cmd, 2, 0); | |
553 | } | |
554 | ||
555 | static void transport_lun_remove_cmd(struct se_cmd *cmd) | |
556 | { | |
e3d6f909 | 557 | struct se_lun *lun = cmd->se_lun; |
c66ac9db NB |
558 | unsigned long flags; |
559 | ||
560 | if (!lun) | |
561 | return; | |
562 | ||
a1d8b49a | 563 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
6708bb27 | 564 | if (!atomic_read(&cmd->transport_dev_active)) { |
a1d8b49a | 565 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
566 | goto check_lun; |
567 | } | |
a1d8b49a | 568 | atomic_set(&cmd->transport_dev_active, 0); |
c66ac9db | 569 | transport_all_task_dev_remove_state(cmd); |
a1d8b49a | 570 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 571 | |
c66ac9db NB |
572 | |
573 | check_lun: | |
574 | spin_lock_irqsave(&lun->lun_cmd_lock, flags); | |
a1d8b49a | 575 | if (atomic_read(&cmd->transport_lun_active)) { |
5951146d | 576 | list_del(&cmd->se_lun_node); |
a1d8b49a | 577 | atomic_set(&cmd->transport_lun_active, 0); |
c66ac9db | 578 | #if 0 |
6708bb27 | 579 | pr_debug("Removed ITT: 0x%08x from LUN LIST[%d]\n" |
e3d6f909 | 580 | cmd->se_tfo->get_task_tag(cmd), lun->unpacked_lun); |
c66ac9db NB |
581 | #endif |
582 | } | |
583 | spin_unlock_irqrestore(&lun->lun_cmd_lock, flags); | |
584 | } | |
585 | ||
586 | void transport_cmd_finish_abort(struct se_cmd *cmd, int remove) | |
587 | { | |
8dc52b54 NB |
588 | if (!cmd->se_tmr_req) |
589 | transport_lun_remove_cmd(cmd); | |
c66ac9db NB |
590 | |
591 | if (transport_cmd_check_stop_to_fabric(cmd)) | |
592 | return; | |
77039d1e NB |
593 | if (remove) { |
594 | transport_remove_cmd_from_queue(cmd, &cmd->se_dev->dev_queue_obj); | |
e6a2573f | 595 | transport_put_cmd(cmd); |
77039d1e | 596 | } |
c66ac9db NB |
597 | } |
598 | ||
5951146d | 599 | static void transport_add_cmd_to_queue( |
c66ac9db NB |
600 | struct se_cmd *cmd, |
601 | int t_state) | |
602 | { | |
603 | struct se_device *dev = cmd->se_dev; | |
e3d6f909 | 604 | struct se_queue_obj *qobj = &dev->dev_queue_obj; |
c66ac9db NB |
605 | unsigned long flags; |
606 | ||
c66ac9db | 607 | if (t_state) { |
a1d8b49a | 608 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 609 | cmd->t_state = t_state; |
a1d8b49a AG |
610 | atomic_set(&cmd->t_transport_active, 1); |
611 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
c66ac9db NB |
612 | } |
613 | ||
614 | spin_lock_irqsave(&qobj->cmd_queue_lock, flags); | |
79a7fef2 RD |
615 | |
616 | /* If the cmd is already on the list, remove it before we add it */ | |
617 | if (!list_empty(&cmd->se_queue_node)) | |
618 | list_del(&cmd->se_queue_node); | |
619 | else | |
620 | atomic_inc(&qobj->queue_cnt); | |
621 | ||
07bde79a NB |
622 | if (cmd->se_cmd_flags & SCF_EMULATE_QUEUE_FULL) { |
623 | cmd->se_cmd_flags &= ~SCF_EMULATE_QUEUE_FULL; | |
624 | list_add(&cmd->se_queue_node, &qobj->qobj_list); | |
625 | } else | |
626 | list_add_tail(&cmd->se_queue_node, &qobj->qobj_list); | |
79a7fef2 | 627 | atomic_set(&cmd->t_transport_queue_active, 1); |
c66ac9db NB |
628 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); |
629 | ||
c66ac9db | 630 | wake_up_interruptible(&qobj->thread_wq); |
c66ac9db NB |
631 | } |
632 | ||
5951146d AG |
633 | static struct se_cmd * |
634 | transport_get_cmd_from_queue(struct se_queue_obj *qobj) | |
c66ac9db | 635 | { |
5951146d | 636 | struct se_cmd *cmd; |
c66ac9db NB |
637 | unsigned long flags; |
638 | ||
639 | spin_lock_irqsave(&qobj->cmd_queue_lock, flags); | |
640 | if (list_empty(&qobj->qobj_list)) { | |
641 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); | |
642 | return NULL; | |
643 | } | |
5951146d | 644 | cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node); |
c66ac9db | 645 | |
79a7fef2 | 646 | atomic_set(&cmd->t_transport_queue_active, 0); |
c66ac9db | 647 | |
79a7fef2 | 648 | list_del_init(&cmd->se_queue_node); |
c66ac9db NB |
649 | atomic_dec(&qobj->queue_cnt); |
650 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); | |
651 | ||
5951146d | 652 | return cmd; |
c66ac9db NB |
653 | } |
654 | ||
655 | static void transport_remove_cmd_from_queue(struct se_cmd *cmd, | |
656 | struct se_queue_obj *qobj) | |
657 | { | |
c66ac9db NB |
658 | unsigned long flags; |
659 | ||
660 | spin_lock_irqsave(&qobj->cmd_queue_lock, flags); | |
6708bb27 | 661 | if (!atomic_read(&cmd->t_transport_queue_active)) { |
c66ac9db NB |
662 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); |
663 | return; | |
664 | } | |
79a7fef2 RD |
665 | atomic_set(&cmd->t_transport_queue_active, 0); |
666 | atomic_dec(&qobj->queue_cnt); | |
667 | list_del_init(&cmd->se_queue_node); | |
c66ac9db NB |
668 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); |
669 | ||
a1d8b49a | 670 | if (atomic_read(&cmd->t_transport_queue_active)) { |
6708bb27 | 671 | pr_err("ITT: 0x%08x t_transport_queue_active: %d\n", |
e3d6f909 | 672 | cmd->se_tfo->get_task_tag(cmd), |
a1d8b49a | 673 | atomic_read(&cmd->t_transport_queue_active)); |
c66ac9db NB |
674 | } |
675 | } | |
676 | ||
677 | /* | |
678 | * Completion function used by TCM subsystem plugins (such as FILEIO) | |
679 | * for queueing up response from struct se_subsystem_api->do_task() | |
680 | */ | |
681 | void transport_complete_sync_cache(struct se_cmd *cmd, int good) | |
682 | { | |
a1d8b49a | 683 | struct se_task *task = list_entry(cmd->t_task_list.next, |
c66ac9db NB |
684 | struct se_task, t_list); |
685 | ||
686 | if (good) { | |
687 | cmd->scsi_status = SAM_STAT_GOOD; | |
688 | task->task_scsi_status = GOOD; | |
689 | } else { | |
690 | task->task_scsi_status = SAM_STAT_CHECK_CONDITION; | |
691 | task->task_error_status = PYX_TRANSPORT_ILLEGAL_REQUEST; | |
e3d6f909 | 692 | task->task_se_cmd->transport_error_status = |
c66ac9db NB |
693 | PYX_TRANSPORT_ILLEGAL_REQUEST; |
694 | } | |
695 | ||
696 | transport_complete_task(task, good); | |
697 | } | |
698 | EXPORT_SYMBOL(transport_complete_sync_cache); | |
699 | ||
700 | /* transport_complete_task(): | |
701 | * | |
702 | * Called from interrupt and non interrupt context depending | |
703 | * on the transport plugin. | |
704 | */ | |
705 | void transport_complete_task(struct se_task *task, int success) | |
706 | { | |
e3d6f909 | 707 | struct se_cmd *cmd = task->task_se_cmd; |
42bf829e | 708 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
709 | int t_state; |
710 | unsigned long flags; | |
711 | #if 0 | |
6708bb27 | 712 | pr_debug("task: %p CDB: 0x%02x obj_ptr: %p\n", task, |
a1d8b49a | 713 | cmd->t_task_cdb[0], dev); |
c66ac9db | 714 | #endif |
e3d6f909 | 715 | if (dev) |
c66ac9db | 716 | atomic_inc(&dev->depth_left); |
c66ac9db | 717 | |
a1d8b49a | 718 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
6c76bf95 | 719 | task->task_flags &= ~TF_ACTIVE; |
c66ac9db NB |
720 | |
721 | /* | |
722 | * See if any sense data exists, if so set the TASK_SENSE flag. | |
723 | * Also check for any other post completion work that needs to be | |
724 | * done by the plugins. | |
725 | */ | |
726 | if (dev && dev->transport->transport_complete) { | |
727 | if (dev->transport->transport_complete(task) != 0) { | |
728 | cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE; | |
729 | task->task_sense = 1; | |
730 | success = 1; | |
731 | } | |
732 | } | |
733 | ||
734 | /* | |
735 | * See if we are waiting for outstanding struct se_task | |
736 | * to complete for an exception condition | |
737 | */ | |
6c76bf95 | 738 | if (task->task_flags & TF_REQUEST_STOP) { |
c66ac9db | 739 | /* |
a1d8b49a | 740 | * Decrement cmd->t_se_count if this task had |
c66ac9db NB |
741 | * previously thrown its timeout exception handler. |
742 | */ | |
6c76bf95 | 743 | if (task->task_flags & TF_TIMEOUT) { |
a1d8b49a | 744 | atomic_dec(&cmd->t_se_count); |
6c76bf95 | 745 | task->task_flags &= ~TF_TIMEOUT; |
c66ac9db | 746 | } |
a1d8b49a | 747 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
748 | |
749 | complete(&task->task_stop_comp); | |
750 | return; | |
751 | } | |
752 | /* | |
753 | * If the task's timeout handler has fired, use the t_task_cdbs_timeout | |
754 | * left counter to determine when the struct se_cmd is ready to be queued to | |
755 | * the processing thread. | |
756 | */ | |
6c76bf95 | 757 | if (task->task_flags & TF_TIMEOUT) { |
6708bb27 AG |
758 | if (!atomic_dec_and_test( |
759 | &cmd->t_task_cdbs_timeout_left)) { | |
a1d8b49a | 760 | spin_unlock_irqrestore(&cmd->t_state_lock, |
c66ac9db NB |
761 | flags); |
762 | return; | |
763 | } | |
764 | t_state = TRANSPORT_COMPLETE_TIMEOUT; | |
a1d8b49a | 765 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
766 | |
767 | transport_add_cmd_to_queue(cmd, t_state); | |
768 | return; | |
769 | } | |
a1d8b49a | 770 | atomic_dec(&cmd->t_task_cdbs_timeout_left); |
c66ac9db NB |
771 | |
772 | /* | |
773 | * Decrement the outstanding t_task_cdbs_left count. The last | |
774 | * struct se_task from struct se_cmd will complete itself into the | |
775 | * device queue depending upon int success. | |
776 | */ | |
6708bb27 | 777 | if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) { |
c66ac9db | 778 | if (!success) |
a1d8b49a | 779 | cmd->t_tasks_failed = 1; |
c66ac9db | 780 | |
a1d8b49a | 781 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
782 | return; |
783 | } | |
784 | ||
a1d8b49a | 785 | if (!success || cmd->t_tasks_failed) { |
c66ac9db NB |
786 | t_state = TRANSPORT_COMPLETE_FAILURE; |
787 | if (!task->task_error_status) { | |
788 | task->task_error_status = | |
789 | PYX_TRANSPORT_UNKNOWN_SAM_OPCODE; | |
790 | cmd->transport_error_status = | |
791 | PYX_TRANSPORT_UNKNOWN_SAM_OPCODE; | |
792 | } | |
793 | } else { | |
a1d8b49a | 794 | atomic_set(&cmd->t_transport_complete, 1); |
c66ac9db NB |
795 | t_state = TRANSPORT_COMPLETE_OK; |
796 | } | |
a1d8b49a | 797 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
798 | |
799 | transport_add_cmd_to_queue(cmd, t_state); | |
800 | } | |
801 | EXPORT_SYMBOL(transport_complete_task); | |
802 | ||
803 | /* | |
804 | * Called by transport_add_tasks_from_cmd() once a struct se_cmd's | |
805 | * struct se_task list are ready to be added to the active execution list | |
806 | * struct se_device | |
807 | ||
808 | * Called with se_dev_t->execute_task_lock called. | |
809 | */ | |
810 | static inline int transport_add_task_check_sam_attr( | |
811 | struct se_task *task, | |
812 | struct se_task *task_prev, | |
813 | struct se_device *dev) | |
814 | { | |
815 | /* | |
816 | * No SAM Task attribute emulation enabled, add to tail of | |
817 | * execution queue | |
818 | */ | |
819 | if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) { | |
820 | list_add_tail(&task->t_execute_list, &dev->execute_task_list); | |
821 | return 0; | |
822 | } | |
823 | /* | |
824 | * HEAD_OF_QUEUE attribute for received CDB, which means | |
825 | * the first task that is associated with a struct se_cmd goes to | |
826 | * head of the struct se_device->execute_task_list, and task_prev | |
827 | * after that for each subsequent task | |
828 | */ | |
e66ecd50 | 829 | if (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG) { |
c66ac9db NB |
830 | list_add(&task->t_execute_list, |
831 | (task_prev != NULL) ? | |
832 | &task_prev->t_execute_list : | |
833 | &dev->execute_task_list); | |
834 | ||
6708bb27 | 835 | pr_debug("Set HEAD_OF_QUEUE for task CDB: 0x%02x" |
c66ac9db | 836 | " in execution queue\n", |
6708bb27 | 837 | task->task_se_cmd->t_task_cdb[0]); |
c66ac9db NB |
838 | return 1; |
839 | } | |
840 | /* | |
841 | * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been | |
842 | * transitioned from Dermant -> Active state, and are added to the end | |
843 | * of the struct se_device->execute_task_list | |
844 | */ | |
845 | list_add_tail(&task->t_execute_list, &dev->execute_task_list); | |
846 | return 0; | |
847 | } | |
848 | ||
849 | /* __transport_add_task_to_execute_queue(): | |
850 | * | |
851 | * Called with se_dev_t->execute_task_lock called. | |
852 | */ | |
853 | static void __transport_add_task_to_execute_queue( | |
854 | struct se_task *task, | |
855 | struct se_task *task_prev, | |
856 | struct se_device *dev) | |
857 | { | |
858 | int head_of_queue; | |
859 | ||
860 | head_of_queue = transport_add_task_check_sam_attr(task, task_prev, dev); | |
861 | atomic_inc(&dev->execute_tasks); | |
862 | ||
863 | if (atomic_read(&task->task_state_active)) | |
864 | return; | |
865 | /* | |
866 | * Determine if this task needs to go to HEAD_OF_QUEUE for the | |
867 | * state list as well. Running with SAM Task Attribute emulation | |
868 | * will always return head_of_queue == 0 here | |
869 | */ | |
870 | if (head_of_queue) | |
871 | list_add(&task->t_state_list, (task_prev) ? | |
872 | &task_prev->t_state_list : | |
873 | &dev->state_task_list); | |
874 | else | |
875 | list_add_tail(&task->t_state_list, &dev->state_task_list); | |
876 | ||
877 | atomic_set(&task->task_state_active, 1); | |
878 | ||
6708bb27 | 879 | pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n", |
e3d6f909 | 880 | task->task_se_cmd->se_tfo->get_task_tag(task->task_se_cmd), |
c66ac9db NB |
881 | task, dev); |
882 | } | |
883 | ||
884 | static void transport_add_tasks_to_state_queue(struct se_cmd *cmd) | |
885 | { | |
42bf829e | 886 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
887 | struct se_task *task; |
888 | unsigned long flags; | |
889 | ||
a1d8b49a AG |
890 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
891 | list_for_each_entry(task, &cmd->t_task_list, t_list) { | |
c66ac9db NB |
892 | if (atomic_read(&task->task_state_active)) |
893 | continue; | |
894 | ||
895 | spin_lock(&dev->execute_task_lock); | |
896 | list_add_tail(&task->t_state_list, &dev->state_task_list); | |
897 | atomic_set(&task->task_state_active, 1); | |
898 | ||
6708bb27 AG |
899 | pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n", |
900 | task->task_se_cmd->se_tfo->get_task_tag( | |
c66ac9db NB |
901 | task->task_se_cmd), task, dev); |
902 | ||
903 | spin_unlock(&dev->execute_task_lock); | |
904 | } | |
a1d8b49a | 905 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
906 | } |
907 | ||
908 | static void transport_add_tasks_from_cmd(struct se_cmd *cmd) | |
909 | { | |
5951146d | 910 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
911 | struct se_task *task, *task_prev = NULL; |
912 | unsigned long flags; | |
913 | ||
914 | spin_lock_irqsave(&dev->execute_task_lock, flags); | |
a1d8b49a | 915 | list_for_each_entry(task, &cmd->t_task_list, t_list) { |
04629b7b | 916 | if (!list_empty(&task->t_execute_list)) |
c66ac9db NB |
917 | continue; |
918 | /* | |
919 | * __transport_add_task_to_execute_queue() handles the | |
920 | * SAM Task Attribute emulation if enabled | |
921 | */ | |
922 | __transport_add_task_to_execute_queue(task, task_prev, dev); | |
c66ac9db NB |
923 | task_prev = task; |
924 | } | |
925 | spin_unlock_irqrestore(&dev->execute_task_lock, flags); | |
c66ac9db NB |
926 | } |
927 | ||
04629b7b CH |
928 | void __transport_remove_task_from_execute_queue(struct se_task *task, |
929 | struct se_device *dev) | |
930 | { | |
931 | list_del_init(&task->t_execute_list); | |
932 | atomic_dec(&dev->execute_tasks); | |
933 | } | |
934 | ||
52208ae3 | 935 | void transport_remove_task_from_execute_queue( |
c66ac9db NB |
936 | struct se_task *task, |
937 | struct se_device *dev) | |
938 | { | |
939 | unsigned long flags; | |
940 | ||
04629b7b | 941 | if (WARN_ON(list_empty(&task->t_execute_list))) |
af57c3ac | 942 | return; |
af57c3ac | 943 | |
c66ac9db | 944 | spin_lock_irqsave(&dev->execute_task_lock, flags); |
04629b7b | 945 | __transport_remove_task_from_execute_queue(task, dev); |
c66ac9db NB |
946 | spin_unlock_irqrestore(&dev->execute_task_lock, flags); |
947 | } | |
948 | ||
07bde79a NB |
949 | /* |
950 | * Handle QUEUE_FULL / -EAGAIN status | |
951 | */ | |
952 | ||
953 | static void target_qf_do_work(struct work_struct *work) | |
954 | { | |
955 | struct se_device *dev = container_of(work, struct se_device, | |
956 | qf_work_queue); | |
bcac364a | 957 | LIST_HEAD(qf_cmd_list); |
07bde79a NB |
958 | struct se_cmd *cmd, *cmd_tmp; |
959 | ||
960 | spin_lock_irq(&dev->qf_cmd_lock); | |
bcac364a RD |
961 | list_splice_init(&dev->qf_cmd_list, &qf_cmd_list); |
962 | spin_unlock_irq(&dev->qf_cmd_lock); | |
07bde79a | 963 | |
bcac364a | 964 | list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) { |
07bde79a NB |
965 | list_del(&cmd->se_qf_node); |
966 | atomic_dec(&dev->dev_qf_count); | |
967 | smp_mb__after_atomic_dec(); | |
07bde79a | 968 | |
6708bb27 | 969 | pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue" |
07bde79a | 970 | " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd, |
e057f533 | 971 | (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" : |
07bde79a NB |
972 | (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING" |
973 | : "UNKNOWN"); | |
974 | /* | |
975 | * The SCF_EMULATE_QUEUE_FULL flag will be cleared once se_cmd | |
976 | * has been added to head of queue | |
977 | */ | |
978 | transport_add_cmd_to_queue(cmd, cmd->t_state); | |
07bde79a | 979 | } |
07bde79a NB |
980 | } |
981 | ||
c66ac9db NB |
982 | unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd) |
983 | { | |
984 | switch (cmd->data_direction) { | |
985 | case DMA_NONE: | |
986 | return "NONE"; | |
987 | case DMA_FROM_DEVICE: | |
988 | return "READ"; | |
989 | case DMA_TO_DEVICE: | |
990 | return "WRITE"; | |
991 | case DMA_BIDIRECTIONAL: | |
992 | return "BIDI"; | |
993 | default: | |
994 | break; | |
995 | } | |
996 | ||
997 | return "UNKNOWN"; | |
998 | } | |
999 | ||
1000 | void transport_dump_dev_state( | |
1001 | struct se_device *dev, | |
1002 | char *b, | |
1003 | int *bl) | |
1004 | { | |
1005 | *bl += sprintf(b + *bl, "Status: "); | |
1006 | switch (dev->dev_status) { | |
1007 | case TRANSPORT_DEVICE_ACTIVATED: | |
1008 | *bl += sprintf(b + *bl, "ACTIVATED"); | |
1009 | break; | |
1010 | case TRANSPORT_DEVICE_DEACTIVATED: | |
1011 | *bl += sprintf(b + *bl, "DEACTIVATED"); | |
1012 | break; | |
1013 | case TRANSPORT_DEVICE_SHUTDOWN: | |
1014 | *bl += sprintf(b + *bl, "SHUTDOWN"); | |
1015 | break; | |
1016 | case TRANSPORT_DEVICE_OFFLINE_ACTIVATED: | |
1017 | case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED: | |
1018 | *bl += sprintf(b + *bl, "OFFLINE"); | |
1019 | break; | |
1020 | default: | |
1021 | *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status); | |
1022 | break; | |
1023 | } | |
1024 | ||
1025 | *bl += sprintf(b + *bl, " Execute/Left/Max Queue Depth: %d/%d/%d", | |
1026 | atomic_read(&dev->execute_tasks), atomic_read(&dev->depth_left), | |
1027 | dev->queue_depth); | |
1028 | *bl += sprintf(b + *bl, " SectorSize: %u MaxSectors: %u\n", | |
e3d6f909 | 1029 | dev->se_sub_dev->se_dev_attrib.block_size, dev->se_sub_dev->se_dev_attrib.max_sectors); |
c66ac9db NB |
1030 | *bl += sprintf(b + *bl, " "); |
1031 | } | |
1032 | ||
c66ac9db NB |
1033 | void transport_dump_vpd_proto_id( |
1034 | struct t10_vpd *vpd, | |
1035 | unsigned char *p_buf, | |
1036 | int p_buf_len) | |
1037 | { | |
1038 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
1039 | int len; | |
1040 | ||
1041 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
1042 | len = sprintf(buf, "T10 VPD Protocol Identifier: "); | |
1043 | ||
1044 | switch (vpd->protocol_identifier) { | |
1045 | case 0x00: | |
1046 | sprintf(buf+len, "Fibre Channel\n"); | |
1047 | break; | |
1048 | case 0x10: | |
1049 | sprintf(buf+len, "Parallel SCSI\n"); | |
1050 | break; | |
1051 | case 0x20: | |
1052 | sprintf(buf+len, "SSA\n"); | |
1053 | break; | |
1054 | case 0x30: | |
1055 | sprintf(buf+len, "IEEE 1394\n"); | |
1056 | break; | |
1057 | case 0x40: | |
1058 | sprintf(buf+len, "SCSI Remote Direct Memory Access" | |
1059 | " Protocol\n"); | |
1060 | break; | |
1061 | case 0x50: | |
1062 | sprintf(buf+len, "Internet SCSI (iSCSI)\n"); | |
1063 | break; | |
1064 | case 0x60: | |
1065 | sprintf(buf+len, "SAS Serial SCSI Protocol\n"); | |
1066 | break; | |
1067 | case 0x70: | |
1068 | sprintf(buf+len, "Automation/Drive Interface Transport" | |
1069 | " Protocol\n"); | |
1070 | break; | |
1071 | case 0x80: | |
1072 | sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n"); | |
1073 | break; | |
1074 | default: | |
1075 | sprintf(buf+len, "Unknown 0x%02x\n", | |
1076 | vpd->protocol_identifier); | |
1077 | break; | |
1078 | } | |
1079 | ||
1080 | if (p_buf) | |
1081 | strncpy(p_buf, buf, p_buf_len); | |
1082 | else | |
6708bb27 | 1083 | pr_debug("%s", buf); |
c66ac9db NB |
1084 | } |
1085 | ||
1086 | void | |
1087 | transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83) | |
1088 | { | |
1089 | /* | |
1090 | * Check if the Protocol Identifier Valid (PIV) bit is set.. | |
1091 | * | |
1092 | * from spc3r23.pdf section 7.5.1 | |
1093 | */ | |
1094 | if (page_83[1] & 0x80) { | |
1095 | vpd->protocol_identifier = (page_83[0] & 0xf0); | |
1096 | vpd->protocol_identifier_set = 1; | |
1097 | transport_dump_vpd_proto_id(vpd, NULL, 0); | |
1098 | } | |
1099 | } | |
1100 | EXPORT_SYMBOL(transport_set_vpd_proto_id); | |
1101 | ||
1102 | int transport_dump_vpd_assoc( | |
1103 | struct t10_vpd *vpd, | |
1104 | unsigned char *p_buf, | |
1105 | int p_buf_len) | |
1106 | { | |
1107 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
e3d6f909 AG |
1108 | int ret = 0; |
1109 | int len; | |
c66ac9db NB |
1110 | |
1111 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
1112 | len = sprintf(buf, "T10 VPD Identifier Association: "); | |
1113 | ||
1114 | switch (vpd->association) { | |
1115 | case 0x00: | |
1116 | sprintf(buf+len, "addressed logical unit\n"); | |
1117 | break; | |
1118 | case 0x10: | |
1119 | sprintf(buf+len, "target port\n"); | |
1120 | break; | |
1121 | case 0x20: | |
1122 | sprintf(buf+len, "SCSI target device\n"); | |
1123 | break; | |
1124 | default: | |
1125 | sprintf(buf+len, "Unknown 0x%02x\n", vpd->association); | |
e3d6f909 | 1126 | ret = -EINVAL; |
c66ac9db NB |
1127 | break; |
1128 | } | |
1129 | ||
1130 | if (p_buf) | |
1131 | strncpy(p_buf, buf, p_buf_len); | |
1132 | else | |
6708bb27 | 1133 | pr_debug("%s", buf); |
c66ac9db NB |
1134 | |
1135 | return ret; | |
1136 | } | |
1137 | ||
1138 | int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83) | |
1139 | { | |
1140 | /* | |
1141 | * The VPD identification association.. | |
1142 | * | |
1143 | * from spc3r23.pdf Section 7.6.3.1 Table 297 | |
1144 | */ | |
1145 | vpd->association = (page_83[1] & 0x30); | |
1146 | return transport_dump_vpd_assoc(vpd, NULL, 0); | |
1147 | } | |
1148 | EXPORT_SYMBOL(transport_set_vpd_assoc); | |
1149 | ||
1150 | int transport_dump_vpd_ident_type( | |
1151 | struct t10_vpd *vpd, | |
1152 | unsigned char *p_buf, | |
1153 | int p_buf_len) | |
1154 | { | |
1155 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
e3d6f909 AG |
1156 | int ret = 0; |
1157 | int len; | |
c66ac9db NB |
1158 | |
1159 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
1160 | len = sprintf(buf, "T10 VPD Identifier Type: "); | |
1161 | ||
1162 | switch (vpd->device_identifier_type) { | |
1163 | case 0x00: | |
1164 | sprintf(buf+len, "Vendor specific\n"); | |
1165 | break; | |
1166 | case 0x01: | |
1167 | sprintf(buf+len, "T10 Vendor ID based\n"); | |
1168 | break; | |
1169 | case 0x02: | |
1170 | sprintf(buf+len, "EUI-64 based\n"); | |
1171 | break; | |
1172 | case 0x03: | |
1173 | sprintf(buf+len, "NAA\n"); | |
1174 | break; | |
1175 | case 0x04: | |
1176 | sprintf(buf+len, "Relative target port identifier\n"); | |
1177 | break; | |
1178 | case 0x08: | |
1179 | sprintf(buf+len, "SCSI name string\n"); | |
1180 | break; | |
1181 | default: | |
1182 | sprintf(buf+len, "Unsupported: 0x%02x\n", | |
1183 | vpd->device_identifier_type); | |
e3d6f909 | 1184 | ret = -EINVAL; |
c66ac9db NB |
1185 | break; |
1186 | } | |
1187 | ||
e3d6f909 AG |
1188 | if (p_buf) { |
1189 | if (p_buf_len < strlen(buf)+1) | |
1190 | return -EINVAL; | |
c66ac9db | 1191 | strncpy(p_buf, buf, p_buf_len); |
e3d6f909 | 1192 | } else { |
6708bb27 | 1193 | pr_debug("%s", buf); |
e3d6f909 | 1194 | } |
c66ac9db NB |
1195 | |
1196 | return ret; | |
1197 | } | |
1198 | ||
1199 | int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83) | |
1200 | { | |
1201 | /* | |
1202 | * The VPD identifier type.. | |
1203 | * | |
1204 | * from spc3r23.pdf Section 7.6.3.1 Table 298 | |
1205 | */ | |
1206 | vpd->device_identifier_type = (page_83[1] & 0x0f); | |
1207 | return transport_dump_vpd_ident_type(vpd, NULL, 0); | |
1208 | } | |
1209 | EXPORT_SYMBOL(transport_set_vpd_ident_type); | |
1210 | ||
1211 | int transport_dump_vpd_ident( | |
1212 | struct t10_vpd *vpd, | |
1213 | unsigned char *p_buf, | |
1214 | int p_buf_len) | |
1215 | { | |
1216 | unsigned char buf[VPD_TMP_BUF_SIZE]; | |
1217 | int ret = 0; | |
1218 | ||
1219 | memset(buf, 0, VPD_TMP_BUF_SIZE); | |
1220 | ||
1221 | switch (vpd->device_identifier_code_set) { | |
1222 | case 0x01: /* Binary */ | |
1223 | sprintf(buf, "T10 VPD Binary Device Identifier: %s\n", | |
1224 | &vpd->device_identifier[0]); | |
1225 | break; | |
1226 | case 0x02: /* ASCII */ | |
1227 | sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n", | |
1228 | &vpd->device_identifier[0]); | |
1229 | break; | |
1230 | case 0x03: /* UTF-8 */ | |
1231 | sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n", | |
1232 | &vpd->device_identifier[0]); | |
1233 | break; | |
1234 | default: | |
1235 | sprintf(buf, "T10 VPD Device Identifier encoding unsupported:" | |
1236 | " 0x%02x", vpd->device_identifier_code_set); | |
e3d6f909 | 1237 | ret = -EINVAL; |
c66ac9db NB |
1238 | break; |
1239 | } | |
1240 | ||
1241 | if (p_buf) | |
1242 | strncpy(p_buf, buf, p_buf_len); | |
1243 | else | |
6708bb27 | 1244 | pr_debug("%s", buf); |
c66ac9db NB |
1245 | |
1246 | return ret; | |
1247 | } | |
1248 | ||
1249 | int | |
1250 | transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83) | |
1251 | { | |
1252 | static const char hex_str[] = "0123456789abcdef"; | |
1253 | int j = 0, i = 4; /* offset to start of the identifer */ | |
1254 | ||
1255 | /* | |
1256 | * The VPD Code Set (encoding) | |
1257 | * | |
1258 | * from spc3r23.pdf Section 7.6.3.1 Table 296 | |
1259 | */ | |
1260 | vpd->device_identifier_code_set = (page_83[0] & 0x0f); | |
1261 | switch (vpd->device_identifier_code_set) { | |
1262 | case 0x01: /* Binary */ | |
1263 | vpd->device_identifier[j++] = | |
1264 | hex_str[vpd->device_identifier_type]; | |
1265 | while (i < (4 + page_83[3])) { | |
1266 | vpd->device_identifier[j++] = | |
1267 | hex_str[(page_83[i] & 0xf0) >> 4]; | |
1268 | vpd->device_identifier[j++] = | |
1269 | hex_str[page_83[i] & 0x0f]; | |
1270 | i++; | |
1271 | } | |
1272 | break; | |
1273 | case 0x02: /* ASCII */ | |
1274 | case 0x03: /* UTF-8 */ | |
1275 | while (i < (4 + page_83[3])) | |
1276 | vpd->device_identifier[j++] = page_83[i++]; | |
1277 | break; | |
1278 | default: | |
1279 | break; | |
1280 | } | |
1281 | ||
1282 | return transport_dump_vpd_ident(vpd, NULL, 0); | |
1283 | } | |
1284 | EXPORT_SYMBOL(transport_set_vpd_ident); | |
1285 | ||
1286 | static void core_setup_task_attr_emulation(struct se_device *dev) | |
1287 | { | |
1288 | /* | |
1289 | * If this device is from Target_Core_Mod/pSCSI, disable the | |
1290 | * SAM Task Attribute emulation. | |
1291 | * | |
1292 | * This is currently not available in upsream Linux/SCSI Target | |
1293 | * mode code, and is assumed to be disabled while using TCM/pSCSI. | |
1294 | */ | |
e3d6f909 | 1295 | if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) { |
c66ac9db NB |
1296 | dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH; |
1297 | return; | |
1298 | } | |
1299 | ||
1300 | dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED; | |
6708bb27 | 1301 | pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x" |
e3d6f909 AG |
1302 | " device\n", dev->transport->name, |
1303 | dev->transport->get_device_rev(dev)); | |
c66ac9db NB |
1304 | } |
1305 | ||
1306 | static void scsi_dump_inquiry(struct se_device *dev) | |
1307 | { | |
e3d6f909 | 1308 | struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn; |
c66ac9db NB |
1309 | int i, device_type; |
1310 | /* | |
1311 | * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer | |
1312 | */ | |
6708bb27 | 1313 | pr_debug(" Vendor: "); |
c66ac9db NB |
1314 | for (i = 0; i < 8; i++) |
1315 | if (wwn->vendor[i] >= 0x20) | |
6708bb27 | 1316 | pr_debug("%c", wwn->vendor[i]); |
c66ac9db | 1317 | else |
6708bb27 | 1318 | pr_debug(" "); |
c66ac9db | 1319 | |
6708bb27 | 1320 | pr_debug(" Model: "); |
c66ac9db NB |
1321 | for (i = 0; i < 16; i++) |
1322 | if (wwn->model[i] >= 0x20) | |
6708bb27 | 1323 | pr_debug("%c", wwn->model[i]); |
c66ac9db | 1324 | else |
6708bb27 | 1325 | pr_debug(" "); |
c66ac9db | 1326 | |
6708bb27 | 1327 | pr_debug(" Revision: "); |
c66ac9db NB |
1328 | for (i = 0; i < 4; i++) |
1329 | if (wwn->revision[i] >= 0x20) | |
6708bb27 | 1330 | pr_debug("%c", wwn->revision[i]); |
c66ac9db | 1331 | else |
6708bb27 | 1332 | pr_debug(" "); |
c66ac9db | 1333 | |
6708bb27 | 1334 | pr_debug("\n"); |
c66ac9db | 1335 | |
e3d6f909 | 1336 | device_type = dev->transport->get_device_type(dev); |
6708bb27 AG |
1337 | pr_debug(" Type: %s ", scsi_device_type(device_type)); |
1338 | pr_debug(" ANSI SCSI revision: %02x\n", | |
e3d6f909 | 1339 | dev->transport->get_device_rev(dev)); |
c66ac9db NB |
1340 | } |
1341 | ||
1342 | struct se_device *transport_add_device_to_core_hba( | |
1343 | struct se_hba *hba, | |
1344 | struct se_subsystem_api *transport, | |
1345 | struct se_subsystem_dev *se_dev, | |
1346 | u32 device_flags, | |
1347 | void *transport_dev, | |
1348 | struct se_dev_limits *dev_limits, | |
1349 | const char *inquiry_prod, | |
1350 | const char *inquiry_rev) | |
1351 | { | |
12a18bdc | 1352 | int force_pt; |
c66ac9db NB |
1353 | struct se_device *dev; |
1354 | ||
1355 | dev = kzalloc(sizeof(struct se_device), GFP_KERNEL); | |
6708bb27 AG |
1356 | if (!dev) { |
1357 | pr_err("Unable to allocate memory for se_dev_t\n"); | |
c66ac9db NB |
1358 | return NULL; |
1359 | } | |
c66ac9db | 1360 | |
e3d6f909 | 1361 | transport_init_queue_obj(&dev->dev_queue_obj); |
c66ac9db NB |
1362 | dev->dev_flags = device_flags; |
1363 | dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED; | |
5951146d | 1364 | dev->dev_ptr = transport_dev; |
c66ac9db NB |
1365 | dev->se_hba = hba; |
1366 | dev->se_sub_dev = se_dev; | |
1367 | dev->transport = transport; | |
1368 | atomic_set(&dev->active_cmds, 0); | |
1369 | INIT_LIST_HEAD(&dev->dev_list); | |
1370 | INIT_LIST_HEAD(&dev->dev_sep_list); | |
1371 | INIT_LIST_HEAD(&dev->dev_tmr_list); | |
1372 | INIT_LIST_HEAD(&dev->execute_task_list); | |
1373 | INIT_LIST_HEAD(&dev->delayed_cmd_list); | |
1374 | INIT_LIST_HEAD(&dev->ordered_cmd_list); | |
1375 | INIT_LIST_HEAD(&dev->state_task_list); | |
07bde79a | 1376 | INIT_LIST_HEAD(&dev->qf_cmd_list); |
c66ac9db NB |
1377 | spin_lock_init(&dev->execute_task_lock); |
1378 | spin_lock_init(&dev->delayed_cmd_lock); | |
1379 | spin_lock_init(&dev->ordered_cmd_lock); | |
1380 | spin_lock_init(&dev->state_task_lock); | |
1381 | spin_lock_init(&dev->dev_alua_lock); | |
1382 | spin_lock_init(&dev->dev_reservation_lock); | |
1383 | spin_lock_init(&dev->dev_status_lock); | |
1384 | spin_lock_init(&dev->dev_status_thr_lock); | |
1385 | spin_lock_init(&dev->se_port_lock); | |
1386 | spin_lock_init(&dev->se_tmr_lock); | |
07bde79a | 1387 | spin_lock_init(&dev->qf_cmd_lock); |
c66ac9db NB |
1388 | |
1389 | dev->queue_depth = dev_limits->queue_depth; | |
1390 | atomic_set(&dev->depth_left, dev->queue_depth); | |
1391 | atomic_set(&dev->dev_ordered_id, 0); | |
1392 | ||
1393 | se_dev_set_default_attribs(dev, dev_limits); | |
1394 | ||
1395 | dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX); | |
1396 | dev->creation_time = get_jiffies_64(); | |
1397 | spin_lock_init(&dev->stats_lock); | |
1398 | ||
1399 | spin_lock(&hba->device_lock); | |
1400 | list_add_tail(&dev->dev_list, &hba->hba_dev_list); | |
1401 | hba->dev_count++; | |
1402 | spin_unlock(&hba->device_lock); | |
1403 | /* | |
1404 | * Setup the SAM Task Attribute emulation for struct se_device | |
1405 | */ | |
1406 | core_setup_task_attr_emulation(dev); | |
1407 | /* | |
1408 | * Force PR and ALUA passthrough emulation with internal object use. | |
1409 | */ | |
1410 | force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE); | |
1411 | /* | |
1412 | * Setup the Reservations infrastructure for struct se_device | |
1413 | */ | |
1414 | core_setup_reservations(dev, force_pt); | |
1415 | /* | |
1416 | * Setup the Asymmetric Logical Unit Assignment for struct se_device | |
1417 | */ | |
1418 | if (core_setup_alua(dev, force_pt) < 0) | |
1419 | goto out; | |
1420 | ||
1421 | /* | |
1422 | * Startup the struct se_device processing thread | |
1423 | */ | |
1424 | dev->process_thread = kthread_run(transport_processing_thread, dev, | |
e3d6f909 | 1425 | "LIO_%s", dev->transport->name); |
c66ac9db | 1426 | if (IS_ERR(dev->process_thread)) { |
6708bb27 | 1427 | pr_err("Unable to create kthread: LIO_%s\n", |
e3d6f909 | 1428 | dev->transport->name); |
c66ac9db NB |
1429 | goto out; |
1430 | } | |
07bde79a NB |
1431 | /* |
1432 | * Setup work_queue for QUEUE_FULL | |
1433 | */ | |
1434 | INIT_WORK(&dev->qf_work_queue, target_qf_do_work); | |
c66ac9db NB |
1435 | /* |
1436 | * Preload the initial INQUIRY const values if we are doing | |
1437 | * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI | |
1438 | * passthrough because this is being provided by the backend LLD. | |
1439 | * This is required so that transport_get_inquiry() copies these | |
1440 | * originals once back into DEV_T10_WWN(dev) for the virtual device | |
1441 | * setup. | |
1442 | */ | |
e3d6f909 | 1443 | if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) { |
f22c1196 | 1444 | if (!inquiry_prod || !inquiry_rev) { |
6708bb27 | 1445 | pr_err("All non TCM/pSCSI plugins require" |
c66ac9db NB |
1446 | " INQUIRY consts\n"); |
1447 | goto out; | |
1448 | } | |
1449 | ||
e3d6f909 AG |
1450 | strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8); |
1451 | strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16); | |
1452 | strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4); | |
c66ac9db NB |
1453 | } |
1454 | scsi_dump_inquiry(dev); | |
1455 | ||
12a18bdc | 1456 | return dev; |
c66ac9db | 1457 | out: |
c66ac9db NB |
1458 | kthread_stop(dev->process_thread); |
1459 | ||
1460 | spin_lock(&hba->device_lock); | |
1461 | list_del(&dev->dev_list); | |
1462 | hba->dev_count--; | |
1463 | spin_unlock(&hba->device_lock); | |
1464 | ||
1465 | se_release_vpd_for_dev(dev); | |
1466 | ||
c66ac9db NB |
1467 | kfree(dev); |
1468 | ||
1469 | return NULL; | |
1470 | } | |
1471 | EXPORT_SYMBOL(transport_add_device_to_core_hba); | |
1472 | ||
1473 | /* transport_generic_prepare_cdb(): | |
1474 | * | |
1475 | * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will | |
1476 | * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2. | |
1477 | * The point of this is since we are mapping iSCSI LUNs to | |
1478 | * SCSI Target IDs having a non-zero LUN in the CDB will throw the | |
1479 | * devices and HBAs for a loop. | |
1480 | */ | |
1481 | static inline void transport_generic_prepare_cdb( | |
1482 | unsigned char *cdb) | |
1483 | { | |
1484 | switch (cdb[0]) { | |
1485 | case READ_10: /* SBC - RDProtect */ | |
1486 | case READ_12: /* SBC - RDProtect */ | |
1487 | case READ_16: /* SBC - RDProtect */ | |
1488 | case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */ | |
1489 | case VERIFY: /* SBC - VRProtect */ | |
1490 | case VERIFY_16: /* SBC - VRProtect */ | |
1491 | case WRITE_VERIFY: /* SBC - VRProtect */ | |
1492 | case WRITE_VERIFY_12: /* SBC - VRProtect */ | |
1493 | break; | |
1494 | default: | |
1495 | cdb[1] &= 0x1f; /* clear logical unit number */ | |
1496 | break; | |
1497 | } | |
1498 | } | |
1499 | ||
1500 | static struct se_task * | |
1501 | transport_generic_get_task(struct se_cmd *cmd, | |
1502 | enum dma_data_direction data_direction) | |
1503 | { | |
1504 | struct se_task *task; | |
5951146d | 1505 | struct se_device *dev = cmd->se_dev; |
c66ac9db | 1506 | |
6708bb27 | 1507 | task = dev->transport->alloc_task(cmd->t_task_cdb); |
c66ac9db | 1508 | if (!task) { |
6708bb27 | 1509 | pr_err("Unable to allocate struct se_task\n"); |
c66ac9db NB |
1510 | return NULL; |
1511 | } | |
1512 | ||
1513 | INIT_LIST_HEAD(&task->t_list); | |
1514 | INIT_LIST_HEAD(&task->t_execute_list); | |
1515 | INIT_LIST_HEAD(&task->t_state_list); | |
1516 | init_completion(&task->task_stop_comp); | |
c66ac9db | 1517 | task->task_se_cmd = cmd; |
c66ac9db NB |
1518 | task->task_data_direction = data_direction; |
1519 | ||
c66ac9db NB |
1520 | return task; |
1521 | } | |
1522 | ||
1523 | static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *); | |
1524 | ||
c66ac9db NB |
1525 | /* |
1526 | * Used by fabric modules containing a local struct se_cmd within their | |
1527 | * fabric dependent per I/O descriptor. | |
1528 | */ | |
1529 | void transport_init_se_cmd( | |
1530 | struct se_cmd *cmd, | |
1531 | struct target_core_fabric_ops *tfo, | |
1532 | struct se_session *se_sess, | |
1533 | u32 data_length, | |
1534 | int data_direction, | |
1535 | int task_attr, | |
1536 | unsigned char *sense_buffer) | |
1537 | { | |
5951146d AG |
1538 | INIT_LIST_HEAD(&cmd->se_lun_node); |
1539 | INIT_LIST_HEAD(&cmd->se_delayed_node); | |
1540 | INIT_LIST_HEAD(&cmd->se_ordered_node); | |
07bde79a | 1541 | INIT_LIST_HEAD(&cmd->se_qf_node); |
79a7fef2 | 1542 | INIT_LIST_HEAD(&cmd->se_queue_node); |
c66ac9db | 1543 | |
a1d8b49a AG |
1544 | INIT_LIST_HEAD(&cmd->t_task_list); |
1545 | init_completion(&cmd->transport_lun_fe_stop_comp); | |
1546 | init_completion(&cmd->transport_lun_stop_comp); | |
1547 | init_completion(&cmd->t_transport_stop_comp); | |
1548 | spin_lock_init(&cmd->t_state_lock); | |
1549 | atomic_set(&cmd->transport_dev_active, 1); | |
c66ac9db NB |
1550 | |
1551 | cmd->se_tfo = tfo; | |
1552 | cmd->se_sess = se_sess; | |
1553 | cmd->data_length = data_length; | |
1554 | cmd->data_direction = data_direction; | |
1555 | cmd->sam_task_attr = task_attr; | |
1556 | cmd->sense_buffer = sense_buffer; | |
1557 | } | |
1558 | EXPORT_SYMBOL(transport_init_se_cmd); | |
1559 | ||
1560 | static int transport_check_alloc_task_attr(struct se_cmd *cmd) | |
1561 | { | |
1562 | /* | |
1563 | * Check if SAM Task Attribute emulation is enabled for this | |
1564 | * struct se_device storage object | |
1565 | */ | |
5951146d | 1566 | if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) |
c66ac9db NB |
1567 | return 0; |
1568 | ||
e66ecd50 | 1569 | if (cmd->sam_task_attr == MSG_ACA_TAG) { |
6708bb27 | 1570 | pr_debug("SAM Task Attribute ACA" |
c66ac9db | 1571 | " emulation is not supported\n"); |
e3d6f909 | 1572 | return -EINVAL; |
c66ac9db NB |
1573 | } |
1574 | /* | |
1575 | * Used to determine when ORDERED commands should go from | |
1576 | * Dormant to Active status. | |
1577 | */ | |
5951146d | 1578 | cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id); |
c66ac9db | 1579 | smp_mb__after_atomic_inc(); |
6708bb27 | 1580 | pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n", |
c66ac9db | 1581 | cmd->se_ordered_id, cmd->sam_task_attr, |
6708bb27 | 1582 | cmd->se_dev->transport->name); |
c66ac9db NB |
1583 | return 0; |
1584 | } | |
1585 | ||
c66ac9db NB |
1586 | /* transport_generic_allocate_tasks(): |
1587 | * | |
1588 | * Called from fabric RX Thread. | |
1589 | */ | |
1590 | int transport_generic_allocate_tasks( | |
1591 | struct se_cmd *cmd, | |
1592 | unsigned char *cdb) | |
1593 | { | |
1594 | int ret; | |
1595 | ||
1596 | transport_generic_prepare_cdb(cdb); | |
c66ac9db NB |
1597 | /* |
1598 | * Ensure that the received CDB is less than the max (252 + 8) bytes | |
1599 | * for VARIABLE_LENGTH_CMD | |
1600 | */ | |
1601 | if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) { | |
6708bb27 | 1602 | pr_err("Received SCSI CDB with command_size: %d that" |
c66ac9db NB |
1603 | " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n", |
1604 | scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE); | |
e3d6f909 | 1605 | return -EINVAL; |
c66ac9db NB |
1606 | } |
1607 | /* | |
1608 | * If the received CDB is larger than TCM_MAX_COMMAND_SIZE, | |
1609 | * allocate the additional extended CDB buffer now.. Otherwise | |
1610 | * setup the pointer from __t_task_cdb to t_task_cdb. | |
1611 | */ | |
a1d8b49a AG |
1612 | if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) { |
1613 | cmd->t_task_cdb = kzalloc(scsi_command_size(cdb), | |
c66ac9db | 1614 | GFP_KERNEL); |
6708bb27 AG |
1615 | if (!cmd->t_task_cdb) { |
1616 | pr_err("Unable to allocate cmd->t_task_cdb" | |
a1d8b49a | 1617 | " %u > sizeof(cmd->__t_task_cdb): %lu ops\n", |
c66ac9db | 1618 | scsi_command_size(cdb), |
a1d8b49a | 1619 | (unsigned long)sizeof(cmd->__t_task_cdb)); |
e3d6f909 | 1620 | return -ENOMEM; |
c66ac9db NB |
1621 | } |
1622 | } else | |
a1d8b49a | 1623 | cmd->t_task_cdb = &cmd->__t_task_cdb[0]; |
c66ac9db | 1624 | /* |
a1d8b49a | 1625 | * Copy the original CDB into cmd-> |
c66ac9db | 1626 | */ |
a1d8b49a | 1627 | memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb)); |
c66ac9db NB |
1628 | /* |
1629 | * Setup the received CDB based on SCSI defined opcodes and | |
1630 | * perform unit attention, persistent reservations and ALUA | |
a1d8b49a | 1631 | * checks for virtual device backends. The cmd->t_task_cdb |
c66ac9db NB |
1632 | * pointer is expected to be setup before we reach this point. |
1633 | */ | |
1634 | ret = transport_generic_cmd_sequencer(cmd, cdb); | |
1635 | if (ret < 0) | |
1636 | return ret; | |
1637 | /* | |
1638 | * Check for SAM Task Attribute Emulation | |
1639 | */ | |
1640 | if (transport_check_alloc_task_attr(cmd) < 0) { | |
1641 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
1642 | cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; | |
5951146d | 1643 | return -EINVAL; |
c66ac9db NB |
1644 | } |
1645 | spin_lock(&cmd->se_lun->lun_sep_lock); | |
1646 | if (cmd->se_lun->lun_sep) | |
1647 | cmd->se_lun->lun_sep->sep_stats.cmd_pdus++; | |
1648 | spin_unlock(&cmd->se_lun->lun_sep_lock); | |
1649 | return 0; | |
1650 | } | |
1651 | EXPORT_SYMBOL(transport_generic_allocate_tasks); | |
1652 | ||
dd8ae59d NB |
1653 | static void transport_generic_request_failure(struct se_cmd *, |
1654 | struct se_device *, int, int); | |
695434e1 NB |
1655 | /* |
1656 | * Used by fabric module frontends to queue tasks directly. | |
1657 | * Many only be used from process context only | |
1658 | */ | |
1659 | int transport_handle_cdb_direct( | |
1660 | struct se_cmd *cmd) | |
1661 | { | |
dd8ae59d NB |
1662 | int ret; |
1663 | ||
695434e1 NB |
1664 | if (!cmd->se_lun) { |
1665 | dump_stack(); | |
6708bb27 | 1666 | pr_err("cmd->se_lun is NULL\n"); |
695434e1 NB |
1667 | return -EINVAL; |
1668 | } | |
1669 | if (in_interrupt()) { | |
1670 | dump_stack(); | |
6708bb27 | 1671 | pr_err("transport_generic_handle_cdb cannot be called" |
695434e1 NB |
1672 | " from interrupt context\n"); |
1673 | return -EINVAL; | |
1674 | } | |
dd8ae59d NB |
1675 | /* |
1676 | * Set TRANSPORT_NEW_CMD state and cmd->t_transport_active=1 following | |
1677 | * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue() | |
1678 | * in existing usage to ensure that outstanding descriptors are handled | |
d14921d6 | 1679 | * correctly during shutdown via transport_wait_for_tasks() |
dd8ae59d NB |
1680 | * |
1681 | * Also, we don't take cmd->t_state_lock here as we only expect | |
1682 | * this to be called for initial descriptor submission. | |
1683 | */ | |
1684 | cmd->t_state = TRANSPORT_NEW_CMD; | |
1685 | atomic_set(&cmd->t_transport_active, 1); | |
1686 | /* | |
1687 | * transport_generic_new_cmd() is already handling QUEUE_FULL, | |
1688 | * so follow TRANSPORT_NEW_CMD processing thread context usage | |
1689 | * and call transport_generic_request_failure() if necessary.. | |
1690 | */ | |
1691 | ret = transport_generic_new_cmd(cmd); | |
1692 | if (ret == -EAGAIN) | |
1693 | return 0; | |
1694 | else if (ret < 0) { | |
1695 | cmd->transport_error_status = ret; | |
1696 | transport_generic_request_failure(cmd, NULL, 0, | |
1697 | (cmd->data_direction != DMA_TO_DEVICE)); | |
1698 | } | |
1699 | return 0; | |
695434e1 NB |
1700 | } |
1701 | EXPORT_SYMBOL(transport_handle_cdb_direct); | |
1702 | ||
c66ac9db NB |
1703 | /* |
1704 | * Used by fabric module frontends defining a TFO->new_cmd_map() caller | |
1705 | * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to | |
1706 | * complete setup in TCM process context w/ TFO->new_cmd_map(). | |
1707 | */ | |
1708 | int transport_generic_handle_cdb_map( | |
1709 | struct se_cmd *cmd) | |
1710 | { | |
e3d6f909 | 1711 | if (!cmd->se_lun) { |
c66ac9db | 1712 | dump_stack(); |
6708bb27 | 1713 | pr_err("cmd->se_lun is NULL\n"); |
e3d6f909 | 1714 | return -EINVAL; |
c66ac9db NB |
1715 | } |
1716 | ||
1717 | transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP); | |
1718 | return 0; | |
1719 | } | |
1720 | EXPORT_SYMBOL(transport_generic_handle_cdb_map); | |
1721 | ||
1722 | /* transport_generic_handle_data(): | |
1723 | * | |
1724 | * | |
1725 | */ | |
1726 | int transport_generic_handle_data( | |
1727 | struct se_cmd *cmd) | |
1728 | { | |
1729 | /* | |
1730 | * For the software fabric case, then we assume the nexus is being | |
1731 | * failed/shutdown when signals are pending from the kthread context | |
1732 | * caller, so we return a failure. For the HW target mode case running | |
1733 | * in interrupt code, the signal_pending() check is skipped. | |
1734 | */ | |
1735 | if (!in_interrupt() && signal_pending(current)) | |
e3d6f909 | 1736 | return -EPERM; |
c66ac9db NB |
1737 | /* |
1738 | * If the received CDB has aleady been ABORTED by the generic | |
1739 | * target engine, we now call transport_check_aborted_status() | |
1740 | * to queue any delated TASK_ABORTED status for the received CDB to the | |
25985edc | 1741 | * fabric module as we are expecting no further incoming DATA OUT |
c66ac9db NB |
1742 | * sequences at this point. |
1743 | */ | |
1744 | if (transport_check_aborted_status(cmd, 1) != 0) | |
1745 | return 0; | |
1746 | ||
1747 | transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE); | |
1748 | return 0; | |
1749 | } | |
1750 | EXPORT_SYMBOL(transport_generic_handle_data); | |
1751 | ||
1752 | /* transport_generic_handle_tmr(): | |
1753 | * | |
1754 | * | |
1755 | */ | |
1756 | int transport_generic_handle_tmr( | |
1757 | struct se_cmd *cmd) | |
1758 | { | |
c66ac9db NB |
1759 | transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR); |
1760 | return 0; | |
1761 | } | |
1762 | EXPORT_SYMBOL(transport_generic_handle_tmr); | |
1763 | ||
f4366772 NB |
1764 | void transport_generic_free_cmd_intr( |
1765 | struct se_cmd *cmd) | |
1766 | { | |
1767 | transport_add_cmd_to_queue(cmd, TRANSPORT_FREE_CMD_INTR); | |
1768 | } | |
1769 | EXPORT_SYMBOL(transport_generic_free_cmd_intr); | |
1770 | ||
c66ac9db NB |
1771 | static int transport_stop_tasks_for_cmd(struct se_cmd *cmd) |
1772 | { | |
1773 | struct se_task *task, *task_tmp; | |
1774 | unsigned long flags; | |
1775 | int ret = 0; | |
1776 | ||
6708bb27 | 1777 | pr_debug("ITT[0x%08x] - Stopping tasks\n", |
e3d6f909 | 1778 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db NB |
1779 | |
1780 | /* | |
1781 | * No tasks remain in the execution queue | |
1782 | */ | |
a1d8b49a | 1783 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 1784 | list_for_each_entry_safe(task, task_tmp, |
a1d8b49a | 1785 | &cmd->t_task_list, t_list) { |
04629b7b | 1786 | pr_debug("Processing task %p\n", task); |
c66ac9db NB |
1787 | /* |
1788 | * If the struct se_task has not been sent and is not active, | |
1789 | * remove the struct se_task from the execution queue. | |
1790 | */ | |
6c76bf95 | 1791 | if (!(task->task_flags & (TF_ACTIVE | TF_SENT))) { |
a1d8b49a | 1792 | spin_unlock_irqrestore(&cmd->t_state_lock, |
c66ac9db NB |
1793 | flags); |
1794 | transport_remove_task_from_execute_queue(task, | |
42bf829e | 1795 | cmd->se_dev); |
c66ac9db | 1796 | |
04629b7b | 1797 | pr_debug("Task %p removed from execute queue\n", task); |
a1d8b49a | 1798 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db NB |
1799 | continue; |
1800 | } | |
1801 | ||
1802 | /* | |
1803 | * If the struct se_task is active, sleep until it is returned | |
1804 | * from the plugin. | |
1805 | */ | |
6c76bf95 CH |
1806 | if (task->task_flags & TF_ACTIVE) { |
1807 | task->task_flags |= TF_REQUEST_STOP; | |
a1d8b49a | 1808 | spin_unlock_irqrestore(&cmd->t_state_lock, |
c66ac9db NB |
1809 | flags); |
1810 | ||
04629b7b | 1811 | pr_debug("Task %p waiting to complete\n", task); |
c66ac9db | 1812 | wait_for_completion(&task->task_stop_comp); |
04629b7b | 1813 | pr_debug("Task %p stopped successfully\n", task); |
c66ac9db | 1814 | |
a1d8b49a AG |
1815 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
1816 | atomic_dec(&cmd->t_task_cdbs_left); | |
6c76bf95 | 1817 | task->task_flags &= ~(TF_ACTIVE | TF_REQUEST_STOP); |
c66ac9db | 1818 | } else { |
04629b7b | 1819 | pr_debug("Task %p - did nothing\n", task); |
c66ac9db NB |
1820 | ret++; |
1821 | } | |
1822 | ||
1823 | __transport_stop_task_timer(task, &flags); | |
1824 | } | |
a1d8b49a | 1825 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
1826 | |
1827 | return ret; | |
1828 | } | |
1829 | ||
c66ac9db NB |
1830 | /* |
1831 | * Handle SAM-esque emulation for generic transport request failures. | |
1832 | */ | |
1833 | static void transport_generic_request_failure( | |
1834 | struct se_cmd *cmd, | |
1835 | struct se_device *dev, | |
1836 | int complete, | |
1837 | int sc) | |
1838 | { | |
07bde79a NB |
1839 | int ret = 0; |
1840 | ||
6708bb27 | 1841 | pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x" |
e3d6f909 | 1842 | " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd), |
a1d8b49a | 1843 | cmd->t_task_cdb[0]); |
6708bb27 | 1844 | pr_debug("-----[ i_state: %d t_state/def_t_state:" |
c66ac9db | 1845 | " %d/%d transport_error_status: %d\n", |
e3d6f909 | 1846 | cmd->se_tfo->get_cmd_state(cmd), |
c66ac9db NB |
1847 | cmd->t_state, cmd->deferred_t_state, |
1848 | cmd->transport_error_status); | |
6708bb27 | 1849 | pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d" |
c66ac9db NB |
1850 | " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --" |
1851 | " t_transport_active: %d t_transport_stop: %d" | |
6708bb27 | 1852 | " t_transport_sent: %d\n", cmd->t_task_list_num, |
a1d8b49a AG |
1853 | atomic_read(&cmd->t_task_cdbs_left), |
1854 | atomic_read(&cmd->t_task_cdbs_sent), | |
1855 | atomic_read(&cmd->t_task_cdbs_ex_left), | |
1856 | atomic_read(&cmd->t_transport_active), | |
1857 | atomic_read(&cmd->t_transport_stop), | |
1858 | atomic_read(&cmd->t_transport_sent)); | |
c66ac9db NB |
1859 | |
1860 | transport_stop_all_task_timers(cmd); | |
1861 | ||
1862 | if (dev) | |
e3d6f909 | 1863 | atomic_inc(&dev->depth_left); |
c66ac9db NB |
1864 | /* |
1865 | * For SAM Task Attribute emulation for failed struct se_cmd | |
1866 | */ | |
1867 | if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) | |
1868 | transport_complete_task_attr(cmd); | |
1869 | ||
1870 | if (complete) { | |
1871 | transport_direct_request_timeout(cmd); | |
1872 | cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE; | |
1873 | } | |
1874 | ||
1875 | switch (cmd->transport_error_status) { | |
1876 | case PYX_TRANSPORT_UNKNOWN_SAM_OPCODE: | |
1877 | cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; | |
1878 | break; | |
1879 | case PYX_TRANSPORT_REQ_TOO_MANY_SECTORS: | |
1880 | cmd->scsi_sense_reason = TCM_SECTOR_COUNT_TOO_MANY; | |
1881 | break; | |
1882 | case PYX_TRANSPORT_INVALID_CDB_FIELD: | |
1883 | cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; | |
1884 | break; | |
1885 | case PYX_TRANSPORT_INVALID_PARAMETER_LIST: | |
1886 | cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; | |
1887 | break; | |
1888 | case PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES: | |
1889 | if (!sc) | |
1890 | transport_new_cmd_failure(cmd); | |
1891 | /* | |
1892 | * Currently for PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES, | |
1893 | * we force this session to fall back to session | |
1894 | * recovery. | |
1895 | */ | |
e3d6f909 AG |
1896 | cmd->se_tfo->fall_back_to_erl0(cmd->se_sess); |
1897 | cmd->se_tfo->stop_session(cmd->se_sess, 0, 0); | |
c66ac9db NB |
1898 | |
1899 | goto check_stop; | |
1900 | case PYX_TRANSPORT_LU_COMM_FAILURE: | |
1901 | case PYX_TRANSPORT_ILLEGAL_REQUEST: | |
1902 | cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
1903 | break; | |
1904 | case PYX_TRANSPORT_UNKNOWN_MODE_PAGE: | |
1905 | cmd->scsi_sense_reason = TCM_UNKNOWN_MODE_PAGE; | |
1906 | break; | |
1907 | case PYX_TRANSPORT_WRITE_PROTECTED: | |
1908 | cmd->scsi_sense_reason = TCM_WRITE_PROTECTED; | |
1909 | break; | |
1910 | case PYX_TRANSPORT_RESERVATION_CONFLICT: | |
1911 | /* | |
1912 | * No SENSE Data payload for this case, set SCSI Status | |
1913 | * and queue the response to $FABRIC_MOD. | |
1914 | * | |
1915 | * Uses linux/include/scsi/scsi.h SAM status codes defs | |
1916 | */ | |
1917 | cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT; | |
1918 | /* | |
1919 | * For UA Interlock Code 11b, a RESERVATION CONFLICT will | |
1920 | * establish a UNIT ATTENTION with PREVIOUS RESERVATION | |
1921 | * CONFLICT STATUS. | |
1922 | * | |
1923 | * See spc4r17, section 7.4.6 Control Mode Page, Table 349 | |
1924 | */ | |
e3d6f909 AG |
1925 | if (cmd->se_sess && |
1926 | cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2) | |
1927 | core_scsi3_ua_allocate(cmd->se_sess->se_node_acl, | |
c66ac9db NB |
1928 | cmd->orig_fe_lun, 0x2C, |
1929 | ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS); | |
1930 | ||
07bde79a NB |
1931 | ret = cmd->se_tfo->queue_status(cmd); |
1932 | if (ret == -EAGAIN) | |
1933 | goto queue_full; | |
c66ac9db NB |
1934 | goto check_stop; |
1935 | case PYX_TRANSPORT_USE_SENSE_REASON: | |
1936 | /* | |
1937 | * struct se_cmd->scsi_sense_reason already set | |
1938 | */ | |
1939 | break; | |
1940 | default: | |
6708bb27 | 1941 | pr_err("Unknown transport error for CDB 0x%02x: %d\n", |
a1d8b49a | 1942 | cmd->t_task_cdb[0], |
c66ac9db NB |
1943 | cmd->transport_error_status); |
1944 | cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; | |
1945 | break; | |
1946 | } | |
16ab8e60 NB |
1947 | /* |
1948 | * If a fabric does not define a cmd->se_tfo->new_cmd_map caller, | |
1949 | * make the call to transport_send_check_condition_and_sense() | |
1950 | * directly. Otherwise expect the fabric to make the call to | |
1951 | * transport_send_check_condition_and_sense() after handling | |
1952 | * possible unsoliticied write data payloads. | |
1953 | */ | |
1954 | if (!sc && !cmd->se_tfo->new_cmd_map) | |
c66ac9db | 1955 | transport_new_cmd_failure(cmd); |
07bde79a NB |
1956 | else { |
1957 | ret = transport_send_check_condition_and_sense(cmd, | |
1958 | cmd->scsi_sense_reason, 0); | |
1959 | if (ret == -EAGAIN) | |
1960 | goto queue_full; | |
1961 | } | |
1962 | ||
c66ac9db NB |
1963 | check_stop: |
1964 | transport_lun_remove_cmd(cmd); | |
6708bb27 | 1965 | if (!transport_cmd_check_stop_to_fabric(cmd)) |
c66ac9db | 1966 | ; |
07bde79a NB |
1967 | return; |
1968 | ||
1969 | queue_full: | |
e057f533 CH |
1970 | cmd->t_state = TRANSPORT_COMPLETE_QF_OK; |
1971 | transport_handle_queue_full(cmd, cmd->se_dev); | |
c66ac9db NB |
1972 | } |
1973 | ||
1974 | static void transport_direct_request_timeout(struct se_cmd *cmd) | |
1975 | { | |
1976 | unsigned long flags; | |
1977 | ||
a1d8b49a | 1978 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
6708bb27 | 1979 | if (!atomic_read(&cmd->t_transport_timeout)) { |
a1d8b49a | 1980 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
1981 | return; |
1982 | } | |
a1d8b49a AG |
1983 | if (atomic_read(&cmd->t_task_cdbs_timeout_left)) { |
1984 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
c66ac9db NB |
1985 | return; |
1986 | } | |
1987 | ||
a1d8b49a AG |
1988 | atomic_sub(atomic_read(&cmd->t_transport_timeout), |
1989 | &cmd->t_se_count); | |
1990 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
c66ac9db NB |
1991 | } |
1992 | ||
1993 | static void transport_generic_request_timeout(struct se_cmd *cmd) | |
1994 | { | |
1995 | unsigned long flags; | |
1996 | ||
1997 | /* | |
e6a2573f | 1998 | * Reset cmd->t_se_count to allow transport_put_cmd() |
c66ac9db NB |
1999 | * to allow last call to free memory resources. |
2000 | */ | |
a1d8b49a AG |
2001 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
2002 | if (atomic_read(&cmd->t_transport_timeout) > 1) { | |
2003 | int tmp = (atomic_read(&cmd->t_transport_timeout) - 1); | |
c66ac9db | 2004 | |
a1d8b49a | 2005 | atomic_sub(tmp, &cmd->t_se_count); |
c66ac9db | 2006 | } |
a1d8b49a | 2007 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 2008 | |
e6a2573f | 2009 | transport_put_cmd(cmd); |
c66ac9db NB |
2010 | } |
2011 | ||
c66ac9db NB |
2012 | static inline u32 transport_lba_21(unsigned char *cdb) |
2013 | { | |
2014 | return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3]; | |
2015 | } | |
2016 | ||
2017 | static inline u32 transport_lba_32(unsigned char *cdb) | |
2018 | { | |
2019 | return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; | |
2020 | } | |
2021 | ||
2022 | static inline unsigned long long transport_lba_64(unsigned char *cdb) | |
2023 | { | |
2024 | unsigned int __v1, __v2; | |
2025 | ||
2026 | __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; | |
2027 | __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; | |
2028 | ||
2029 | return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; | |
2030 | } | |
2031 | ||
2032 | /* | |
2033 | * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs | |
2034 | */ | |
2035 | static inline unsigned long long transport_lba_64_ext(unsigned char *cdb) | |
2036 | { | |
2037 | unsigned int __v1, __v2; | |
2038 | ||
2039 | __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15]; | |
2040 | __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19]; | |
2041 | ||
2042 | return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; | |
2043 | } | |
2044 | ||
2045 | static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd) | |
2046 | { | |
2047 | unsigned long flags; | |
2048 | ||
a1d8b49a | 2049 | spin_lock_irqsave(&se_cmd->t_state_lock, flags); |
c66ac9db | 2050 | se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE; |
a1d8b49a | 2051 | spin_unlock_irqrestore(&se_cmd->t_state_lock, flags); |
c66ac9db NB |
2052 | } |
2053 | ||
2054 | /* | |
2055 | * Called from interrupt context. | |
2056 | */ | |
2057 | static void transport_task_timeout_handler(unsigned long data) | |
2058 | { | |
2059 | struct se_task *task = (struct se_task *)data; | |
e3d6f909 | 2060 | struct se_cmd *cmd = task->task_se_cmd; |
c66ac9db NB |
2061 | unsigned long flags; |
2062 | ||
6708bb27 | 2063 | pr_debug("transport task timeout fired! task: %p cmd: %p\n", task, cmd); |
c66ac9db | 2064 | |
a1d8b49a | 2065 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
6c76bf95 | 2066 | if (task->task_flags & TF_TIMER_STOP) { |
a1d8b49a | 2067 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
2068 | return; |
2069 | } | |
6c76bf95 | 2070 | task->task_flags &= ~TF_TIMER_RUNNING; |
c66ac9db NB |
2071 | |
2072 | /* | |
2073 | * Determine if transport_complete_task() has already been called. | |
2074 | */ | |
6c76bf95 CH |
2075 | if (!(task->task_flags & TF_ACTIVE)) { |
2076 | pr_debug("transport task: %p cmd: %p timeout !TF_ACTIVE\n", | |
2077 | task, cmd); | |
a1d8b49a | 2078 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
2079 | return; |
2080 | } | |
2081 | ||
a1d8b49a AG |
2082 | atomic_inc(&cmd->t_se_count); |
2083 | atomic_inc(&cmd->t_transport_timeout); | |
2084 | cmd->t_tasks_failed = 1; | |
c66ac9db | 2085 | |
6c76bf95 | 2086 | task->task_flags |= TF_TIMEOUT; |
c66ac9db NB |
2087 | task->task_error_status = PYX_TRANSPORT_TASK_TIMEOUT; |
2088 | task->task_scsi_status = 1; | |
2089 | ||
6c76bf95 CH |
2090 | if (task->task_flags & TF_REQUEST_STOP) { |
2091 | pr_debug("transport task: %p cmd: %p timeout TF_REQUEST_STOP" | |
c66ac9db | 2092 | " == 1\n", task, cmd); |
a1d8b49a | 2093 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
2094 | complete(&task->task_stop_comp); |
2095 | return; | |
2096 | } | |
2097 | ||
6708bb27 AG |
2098 | if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) { |
2099 | pr_debug("transport task: %p cmd: %p timeout non zero" | |
c66ac9db | 2100 | " t_task_cdbs_left\n", task, cmd); |
a1d8b49a | 2101 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
2102 | return; |
2103 | } | |
6708bb27 | 2104 | pr_debug("transport task: %p cmd: %p timeout ZERO t_task_cdbs_left\n", |
c66ac9db NB |
2105 | task, cmd); |
2106 | ||
2107 | cmd->t_state = TRANSPORT_COMPLETE_FAILURE; | |
a1d8b49a | 2108 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
2109 | |
2110 | transport_add_cmd_to_queue(cmd, TRANSPORT_COMPLETE_FAILURE); | |
2111 | } | |
2112 | ||
2113 | /* | |
a1d8b49a | 2114 | * Called with cmd->t_state_lock held. |
c66ac9db NB |
2115 | */ |
2116 | static void transport_start_task_timer(struct se_task *task) | |
2117 | { | |
42bf829e | 2118 | struct se_device *dev = task->task_se_cmd->se_dev; |
c66ac9db NB |
2119 | int timeout; |
2120 | ||
6c76bf95 | 2121 | if (task->task_flags & TF_TIMER_RUNNING) |
c66ac9db NB |
2122 | return; |
2123 | /* | |
2124 | * If the task_timeout is disabled, exit now. | |
2125 | */ | |
e3d6f909 | 2126 | timeout = dev->se_sub_dev->se_dev_attrib.task_timeout; |
6708bb27 | 2127 | if (!timeout) |
c66ac9db NB |
2128 | return; |
2129 | ||
2130 | init_timer(&task->task_timer); | |
2131 | task->task_timer.expires = (get_jiffies_64() + timeout * HZ); | |
2132 | task->task_timer.data = (unsigned long) task; | |
2133 | task->task_timer.function = transport_task_timeout_handler; | |
2134 | ||
6c76bf95 | 2135 | task->task_flags |= TF_TIMER_RUNNING; |
c66ac9db NB |
2136 | add_timer(&task->task_timer); |
2137 | #if 0 | |
6708bb27 | 2138 | pr_debug("Starting task timer for cmd: %p task: %p seconds:" |
c66ac9db NB |
2139 | " %d\n", task->task_se_cmd, task, timeout); |
2140 | #endif | |
2141 | } | |
2142 | ||
2143 | /* | |
a1d8b49a | 2144 | * Called with spin_lock_irq(&cmd->t_state_lock) held. |
c66ac9db NB |
2145 | */ |
2146 | void __transport_stop_task_timer(struct se_task *task, unsigned long *flags) | |
2147 | { | |
e3d6f909 | 2148 | struct se_cmd *cmd = task->task_se_cmd; |
c66ac9db | 2149 | |
6c76bf95 | 2150 | if (!(task->task_flags & TF_TIMER_RUNNING)) |
c66ac9db NB |
2151 | return; |
2152 | ||
6c76bf95 | 2153 | task->task_flags |= TF_TIMER_STOP; |
a1d8b49a | 2154 | spin_unlock_irqrestore(&cmd->t_state_lock, *flags); |
c66ac9db NB |
2155 | |
2156 | del_timer_sync(&task->task_timer); | |
2157 | ||
a1d8b49a | 2158 | spin_lock_irqsave(&cmd->t_state_lock, *flags); |
6c76bf95 CH |
2159 | task->task_flags &= ~TF_TIMER_RUNNING; |
2160 | task->task_flags &= ~TF_TIMER_STOP; | |
c66ac9db NB |
2161 | } |
2162 | ||
2163 | static void transport_stop_all_task_timers(struct se_cmd *cmd) | |
2164 | { | |
2165 | struct se_task *task = NULL, *task_tmp; | |
2166 | unsigned long flags; | |
2167 | ||
a1d8b49a | 2168 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 2169 | list_for_each_entry_safe(task, task_tmp, |
a1d8b49a | 2170 | &cmd->t_task_list, t_list) |
c66ac9db | 2171 | __transport_stop_task_timer(task, &flags); |
a1d8b49a | 2172 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
2173 | } |
2174 | ||
2175 | static inline int transport_tcq_window_closed(struct se_device *dev) | |
2176 | { | |
2177 | if (dev->dev_tcq_window_closed++ < | |
2178 | PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD) { | |
2179 | msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT); | |
2180 | } else | |
2181 | msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG); | |
2182 | ||
e3d6f909 | 2183 | wake_up_interruptible(&dev->dev_queue_obj.thread_wq); |
c66ac9db NB |
2184 | return 0; |
2185 | } | |
2186 | ||
2187 | /* | |
2188 | * Called from Fabric Module context from transport_execute_tasks() | |
2189 | * | |
2190 | * The return of this function determins if the tasks from struct se_cmd | |
2191 | * get added to the execution queue in transport_execute_tasks(), | |
2192 | * or are added to the delayed or ordered lists here. | |
2193 | */ | |
2194 | static inline int transport_execute_task_attr(struct se_cmd *cmd) | |
2195 | { | |
5951146d | 2196 | if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) |
c66ac9db NB |
2197 | return 1; |
2198 | /* | |
25985edc | 2199 | * Check for the existence of HEAD_OF_QUEUE, and if true return 1 |
c66ac9db NB |
2200 | * to allow the passed struct se_cmd list of tasks to the front of the list. |
2201 | */ | |
e66ecd50 | 2202 | if (cmd->sam_task_attr == MSG_HEAD_TAG) { |
5951146d | 2203 | atomic_inc(&cmd->se_dev->dev_hoq_count); |
c66ac9db | 2204 | smp_mb__after_atomic_inc(); |
6708bb27 | 2205 | pr_debug("Added HEAD_OF_QUEUE for CDB:" |
c66ac9db | 2206 | " 0x%02x, se_ordered_id: %u\n", |
6708bb27 | 2207 | cmd->t_task_cdb[0], |
c66ac9db NB |
2208 | cmd->se_ordered_id); |
2209 | return 1; | |
e66ecd50 | 2210 | } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) { |
5951146d AG |
2211 | spin_lock(&cmd->se_dev->ordered_cmd_lock); |
2212 | list_add_tail(&cmd->se_ordered_node, | |
2213 | &cmd->se_dev->ordered_cmd_list); | |
2214 | spin_unlock(&cmd->se_dev->ordered_cmd_lock); | |
c66ac9db | 2215 | |
5951146d | 2216 | atomic_inc(&cmd->se_dev->dev_ordered_sync); |
c66ac9db NB |
2217 | smp_mb__after_atomic_inc(); |
2218 | ||
6708bb27 | 2219 | pr_debug("Added ORDERED for CDB: 0x%02x to ordered" |
c66ac9db | 2220 | " list, se_ordered_id: %u\n", |
a1d8b49a | 2221 | cmd->t_task_cdb[0], |
c66ac9db NB |
2222 | cmd->se_ordered_id); |
2223 | /* | |
2224 | * Add ORDERED command to tail of execution queue if | |
2225 | * no other older commands exist that need to be | |
2226 | * completed first. | |
2227 | */ | |
6708bb27 | 2228 | if (!atomic_read(&cmd->se_dev->simple_cmds)) |
c66ac9db NB |
2229 | return 1; |
2230 | } else { | |
2231 | /* | |
2232 | * For SIMPLE and UNTAGGED Task Attribute commands | |
2233 | */ | |
5951146d | 2234 | atomic_inc(&cmd->se_dev->simple_cmds); |
c66ac9db NB |
2235 | smp_mb__after_atomic_inc(); |
2236 | } | |
2237 | /* | |
2238 | * Otherwise if one or more outstanding ORDERED task attribute exist, | |
2239 | * add the dormant task(s) built for the passed struct se_cmd to the | |
2240 | * execution queue and become in Active state for this struct se_device. | |
2241 | */ | |
5951146d | 2242 | if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) { |
c66ac9db NB |
2243 | /* |
2244 | * Otherwise, add cmd w/ tasks to delayed cmd queue that | |
25985edc | 2245 | * will be drained upon completion of HEAD_OF_QUEUE task. |
c66ac9db | 2246 | */ |
5951146d | 2247 | spin_lock(&cmd->se_dev->delayed_cmd_lock); |
c66ac9db | 2248 | cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR; |
5951146d AG |
2249 | list_add_tail(&cmd->se_delayed_node, |
2250 | &cmd->se_dev->delayed_cmd_list); | |
2251 | spin_unlock(&cmd->se_dev->delayed_cmd_lock); | |
c66ac9db | 2252 | |
6708bb27 | 2253 | pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to" |
c66ac9db | 2254 | " delayed CMD list, se_ordered_id: %u\n", |
a1d8b49a | 2255 | cmd->t_task_cdb[0], cmd->sam_task_attr, |
c66ac9db NB |
2256 | cmd->se_ordered_id); |
2257 | /* | |
2258 | * Return zero to let transport_execute_tasks() know | |
2259 | * not to add the delayed tasks to the execution list. | |
2260 | */ | |
2261 | return 0; | |
2262 | } | |
2263 | /* | |
2264 | * Otherwise, no ORDERED task attributes exist.. | |
2265 | */ | |
2266 | return 1; | |
2267 | } | |
2268 | ||
2269 | /* | |
2270 | * Called from fabric module context in transport_generic_new_cmd() and | |
2271 | * transport_generic_process_write() | |
2272 | */ | |
2273 | static int transport_execute_tasks(struct se_cmd *cmd) | |
2274 | { | |
2275 | int add_tasks; | |
2276 | ||
db1620a2 CH |
2277 | if (se_dev_check_online(cmd->se_orig_obj_ptr) != 0) { |
2278 | cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE; | |
2279 | transport_generic_request_failure(cmd, NULL, 0, 1); | |
2280 | return 0; | |
c66ac9db | 2281 | } |
db1620a2 | 2282 | |
c66ac9db NB |
2283 | /* |
2284 | * Call transport_cmd_check_stop() to see if a fabric exception | |
25985edc | 2285 | * has occurred that prevents execution. |
c66ac9db | 2286 | */ |
6708bb27 | 2287 | if (!transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING)) { |
c66ac9db NB |
2288 | /* |
2289 | * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE | |
2290 | * attribute for the tasks of the received struct se_cmd CDB | |
2291 | */ | |
2292 | add_tasks = transport_execute_task_attr(cmd); | |
e3d6f909 | 2293 | if (!add_tasks) |
c66ac9db NB |
2294 | goto execute_tasks; |
2295 | /* | |
2296 | * This calls transport_add_tasks_from_cmd() to handle | |
2297 | * HEAD_OF_QUEUE ordering for SAM Task Attribute emulation | |
2298 | * (if enabled) in __transport_add_task_to_execute_queue() and | |
2299 | * transport_add_task_check_sam_attr(). | |
2300 | */ | |
2301 | transport_add_tasks_from_cmd(cmd); | |
2302 | } | |
2303 | /* | |
2304 | * Kick the execution queue for the cmd associated struct se_device | |
2305 | * storage object. | |
2306 | */ | |
2307 | execute_tasks: | |
5951146d | 2308 | __transport_execute_tasks(cmd->se_dev); |
c66ac9db NB |
2309 | return 0; |
2310 | } | |
2311 | ||
2312 | /* | |
2313 | * Called to check struct se_device tcq depth window, and once open pull struct se_task | |
2314 | * from struct se_device->execute_task_list and | |
2315 | * | |
2316 | * Called from transport_processing_thread() | |
2317 | */ | |
2318 | static int __transport_execute_tasks(struct se_device *dev) | |
2319 | { | |
2320 | int error; | |
2321 | struct se_cmd *cmd = NULL; | |
e3d6f909 | 2322 | struct se_task *task = NULL; |
c66ac9db NB |
2323 | unsigned long flags; |
2324 | ||
2325 | /* | |
2326 | * Check if there is enough room in the device and HBA queue to send | |
a1d8b49a | 2327 | * struct se_tasks to the selected transport. |
c66ac9db NB |
2328 | */ |
2329 | check_depth: | |
e3d6f909 | 2330 | if (!atomic_read(&dev->depth_left)) |
c66ac9db | 2331 | return transport_tcq_window_closed(dev); |
c66ac9db | 2332 | |
e3d6f909 | 2333 | dev->dev_tcq_window_closed = 0; |
c66ac9db | 2334 | |
e3d6f909 AG |
2335 | spin_lock_irq(&dev->execute_task_lock); |
2336 | if (list_empty(&dev->execute_task_list)) { | |
2337 | spin_unlock_irq(&dev->execute_task_lock); | |
c66ac9db NB |
2338 | return 0; |
2339 | } | |
e3d6f909 AG |
2340 | task = list_first_entry(&dev->execute_task_list, |
2341 | struct se_task, t_execute_list); | |
04629b7b | 2342 | __transport_remove_task_from_execute_queue(task, dev); |
e3d6f909 | 2343 | spin_unlock_irq(&dev->execute_task_lock); |
c66ac9db NB |
2344 | |
2345 | atomic_dec(&dev->depth_left); | |
c66ac9db | 2346 | |
e3d6f909 | 2347 | cmd = task->task_se_cmd; |
c66ac9db | 2348 | |
a1d8b49a | 2349 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
6c76bf95 | 2350 | task->task_flags |= (TF_ACTIVE | TF_SENT); |
a1d8b49a | 2351 | atomic_inc(&cmd->t_task_cdbs_sent); |
c66ac9db | 2352 | |
a1d8b49a AG |
2353 | if (atomic_read(&cmd->t_task_cdbs_sent) == |
2354 | cmd->t_task_list_num) | |
c66ac9db NB |
2355 | atomic_set(&cmd->transport_sent, 1); |
2356 | ||
2357 | transport_start_task_timer(task); | |
a1d8b49a | 2358 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
2359 | /* |
2360 | * The struct se_cmd->transport_emulate_cdb() function pointer is used | |
e3d6f909 | 2361 | * to grab REPORT_LUNS and other CDBs we want to handle before they hit the |
c66ac9db NB |
2362 | * struct se_subsystem_api->do_task() caller below. |
2363 | */ | |
2364 | if (cmd->transport_emulate_cdb) { | |
2365 | error = cmd->transport_emulate_cdb(cmd); | |
2366 | if (error != 0) { | |
2367 | cmd->transport_error_status = error; | |
6c76bf95 CH |
2368 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
2369 | task->task_flags &= ~TF_ACTIVE; | |
2370 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
c66ac9db NB |
2371 | atomic_set(&cmd->transport_sent, 0); |
2372 | transport_stop_tasks_for_cmd(cmd); | |
2373 | transport_generic_request_failure(cmd, dev, 0, 1); | |
2374 | goto check_depth; | |
2375 | } | |
2376 | /* | |
2377 | * Handle the successful completion for transport_emulate_cdb() | |
2378 | * for synchronous operation, following SCF_EMULATE_CDB_ASYNC | |
2379 | * Otherwise the caller is expected to complete the task with | |
2380 | * proper status. | |
2381 | */ | |
2382 | if (!(cmd->se_cmd_flags & SCF_EMULATE_CDB_ASYNC)) { | |
2383 | cmd->scsi_status = SAM_STAT_GOOD; | |
2384 | task->task_scsi_status = GOOD; | |
2385 | transport_complete_task(task, 1); | |
2386 | } | |
2387 | } else { | |
2388 | /* | |
2389 | * Currently for all virtual TCM plugins including IBLOCK, FILEIO and | |
2390 | * RAMDISK we use the internal transport_emulate_control_cdb() logic | |
2391 | * with struct se_subsystem_api callers for the primary SPC-3 TYPE_DISK | |
2392 | * LUN emulation code. | |
2393 | * | |
2394 | * For TCM/pSCSI and all other SCF_SCSI_DATA_SG_IO_CDB I/O tasks we | |
2395 | * call ->do_task() directly and let the underlying TCM subsystem plugin | |
2396 | * code handle the CDB emulation. | |
2397 | */ | |
e3d6f909 AG |
2398 | if ((dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) && |
2399 | (!(task->task_se_cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB))) | |
c66ac9db NB |
2400 | error = transport_emulate_control_cdb(task); |
2401 | else | |
e3d6f909 | 2402 | error = dev->transport->do_task(task); |
c66ac9db NB |
2403 | |
2404 | if (error != 0) { | |
2405 | cmd->transport_error_status = error; | |
6c76bf95 CH |
2406 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
2407 | task->task_flags &= ~TF_ACTIVE; | |
2408 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
c66ac9db NB |
2409 | atomic_set(&cmd->transport_sent, 0); |
2410 | transport_stop_tasks_for_cmd(cmd); | |
2411 | transport_generic_request_failure(cmd, dev, 0, 1); | |
2412 | } | |
2413 | } | |
2414 | ||
2415 | goto check_depth; | |
2416 | ||
2417 | return 0; | |
2418 | } | |
2419 | ||
2420 | void transport_new_cmd_failure(struct se_cmd *se_cmd) | |
2421 | { | |
2422 | unsigned long flags; | |
2423 | /* | |
2424 | * Any unsolicited data will get dumped for failed command inside of | |
2425 | * the fabric plugin | |
2426 | */ | |
a1d8b49a | 2427 | spin_lock_irqsave(&se_cmd->t_state_lock, flags); |
c66ac9db NB |
2428 | se_cmd->se_cmd_flags |= SCF_SE_CMD_FAILED; |
2429 | se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
a1d8b49a | 2430 | spin_unlock_irqrestore(&se_cmd->t_state_lock, flags); |
c66ac9db NB |
2431 | } |
2432 | ||
c66ac9db NB |
2433 | static inline u32 transport_get_sectors_6( |
2434 | unsigned char *cdb, | |
2435 | struct se_cmd *cmd, | |
2436 | int *ret) | |
2437 | { | |
5951146d | 2438 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
2439 | |
2440 | /* | |
2441 | * Assume TYPE_DISK for non struct se_device objects. | |
2442 | * Use 8-bit sector value. | |
2443 | */ | |
2444 | if (!dev) | |
2445 | goto type_disk; | |
2446 | ||
2447 | /* | |
2448 | * Use 24-bit allocation length for TYPE_TAPE. | |
2449 | */ | |
e3d6f909 | 2450 | if (dev->transport->get_device_type(dev) == TYPE_TAPE) |
c66ac9db NB |
2451 | return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4]; |
2452 | ||
2453 | /* | |
2454 | * Everything else assume TYPE_DISK Sector CDB location. | |
2455 | * Use 8-bit sector value. | |
2456 | */ | |
2457 | type_disk: | |
2458 | return (u32)cdb[4]; | |
2459 | } | |
2460 | ||
2461 | static inline u32 transport_get_sectors_10( | |
2462 | unsigned char *cdb, | |
2463 | struct se_cmd *cmd, | |
2464 | int *ret) | |
2465 | { | |
5951146d | 2466 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
2467 | |
2468 | /* | |
2469 | * Assume TYPE_DISK for non struct se_device objects. | |
2470 | * Use 16-bit sector value. | |
2471 | */ | |
2472 | if (!dev) | |
2473 | goto type_disk; | |
2474 | ||
2475 | /* | |
2476 | * XXX_10 is not defined in SSC, throw an exception | |
2477 | */ | |
e3d6f909 AG |
2478 | if (dev->transport->get_device_type(dev) == TYPE_TAPE) { |
2479 | *ret = -EINVAL; | |
c66ac9db NB |
2480 | return 0; |
2481 | } | |
2482 | ||
2483 | /* | |
2484 | * Everything else assume TYPE_DISK Sector CDB location. | |
2485 | * Use 16-bit sector value. | |
2486 | */ | |
2487 | type_disk: | |
2488 | return (u32)(cdb[7] << 8) + cdb[8]; | |
2489 | } | |
2490 | ||
2491 | static inline u32 transport_get_sectors_12( | |
2492 | unsigned char *cdb, | |
2493 | struct se_cmd *cmd, | |
2494 | int *ret) | |
2495 | { | |
5951146d | 2496 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
2497 | |
2498 | /* | |
2499 | * Assume TYPE_DISK for non struct se_device objects. | |
2500 | * Use 32-bit sector value. | |
2501 | */ | |
2502 | if (!dev) | |
2503 | goto type_disk; | |
2504 | ||
2505 | /* | |
2506 | * XXX_12 is not defined in SSC, throw an exception | |
2507 | */ | |
e3d6f909 AG |
2508 | if (dev->transport->get_device_type(dev) == TYPE_TAPE) { |
2509 | *ret = -EINVAL; | |
c66ac9db NB |
2510 | return 0; |
2511 | } | |
2512 | ||
2513 | /* | |
2514 | * Everything else assume TYPE_DISK Sector CDB location. | |
2515 | * Use 32-bit sector value. | |
2516 | */ | |
2517 | type_disk: | |
2518 | return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9]; | |
2519 | } | |
2520 | ||
2521 | static inline u32 transport_get_sectors_16( | |
2522 | unsigned char *cdb, | |
2523 | struct se_cmd *cmd, | |
2524 | int *ret) | |
2525 | { | |
5951146d | 2526 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
2527 | |
2528 | /* | |
2529 | * Assume TYPE_DISK for non struct se_device objects. | |
2530 | * Use 32-bit sector value. | |
2531 | */ | |
2532 | if (!dev) | |
2533 | goto type_disk; | |
2534 | ||
2535 | /* | |
2536 | * Use 24-bit allocation length for TYPE_TAPE. | |
2537 | */ | |
e3d6f909 | 2538 | if (dev->transport->get_device_type(dev) == TYPE_TAPE) |
c66ac9db NB |
2539 | return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14]; |
2540 | ||
2541 | type_disk: | |
2542 | return (u32)(cdb[10] << 24) + (cdb[11] << 16) + | |
2543 | (cdb[12] << 8) + cdb[13]; | |
2544 | } | |
2545 | ||
2546 | /* | |
2547 | * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants | |
2548 | */ | |
2549 | static inline u32 transport_get_sectors_32( | |
2550 | unsigned char *cdb, | |
2551 | struct se_cmd *cmd, | |
2552 | int *ret) | |
2553 | { | |
2554 | /* | |
2555 | * Assume TYPE_DISK for non struct se_device objects. | |
2556 | * Use 32-bit sector value. | |
2557 | */ | |
2558 | return (u32)(cdb[28] << 24) + (cdb[29] << 16) + | |
2559 | (cdb[30] << 8) + cdb[31]; | |
2560 | ||
2561 | } | |
2562 | ||
2563 | static inline u32 transport_get_size( | |
2564 | u32 sectors, | |
2565 | unsigned char *cdb, | |
2566 | struct se_cmd *cmd) | |
2567 | { | |
5951146d | 2568 | struct se_device *dev = cmd->se_dev; |
c66ac9db | 2569 | |
e3d6f909 | 2570 | if (dev->transport->get_device_type(dev) == TYPE_TAPE) { |
c66ac9db | 2571 | if (cdb[1] & 1) { /* sectors */ |
e3d6f909 | 2572 | return dev->se_sub_dev->se_dev_attrib.block_size * sectors; |
c66ac9db NB |
2573 | } else /* bytes */ |
2574 | return sectors; | |
2575 | } | |
2576 | #if 0 | |
6708bb27 | 2577 | pr_debug("Returning block_size: %u, sectors: %u == %u for" |
e3d6f909 AG |
2578 | " %s object\n", dev->se_sub_dev->se_dev_attrib.block_size, sectors, |
2579 | dev->se_sub_dev->se_dev_attrib.block_size * sectors, | |
2580 | dev->transport->name); | |
c66ac9db | 2581 | #endif |
e3d6f909 | 2582 | return dev->se_sub_dev->se_dev_attrib.block_size * sectors; |
c66ac9db NB |
2583 | } |
2584 | ||
c66ac9db NB |
2585 | static void transport_xor_callback(struct se_cmd *cmd) |
2586 | { | |
2587 | unsigned char *buf, *addr; | |
ec98f782 | 2588 | struct scatterlist *sg; |
c66ac9db NB |
2589 | unsigned int offset; |
2590 | int i; | |
ec98f782 | 2591 | int count; |
c66ac9db NB |
2592 | /* |
2593 | * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command | |
2594 | * | |
2595 | * 1) read the specified logical block(s); | |
2596 | * 2) transfer logical blocks from the data-out buffer; | |
2597 | * 3) XOR the logical blocks transferred from the data-out buffer with | |
2598 | * the logical blocks read, storing the resulting XOR data in a buffer; | |
2599 | * 4) if the DISABLE WRITE bit is set to zero, then write the logical | |
2600 | * blocks transferred from the data-out buffer; and | |
2601 | * 5) transfer the resulting XOR data to the data-in buffer. | |
2602 | */ | |
2603 | buf = kmalloc(cmd->data_length, GFP_KERNEL); | |
6708bb27 AG |
2604 | if (!buf) { |
2605 | pr_err("Unable to allocate xor_callback buf\n"); | |
c66ac9db NB |
2606 | return; |
2607 | } | |
2608 | /* | |
ec98f782 | 2609 | * Copy the scatterlist WRITE buffer located at cmd->t_data_sg |
c66ac9db NB |
2610 | * into the locally allocated *buf |
2611 | */ | |
ec98f782 AG |
2612 | sg_copy_to_buffer(cmd->t_data_sg, |
2613 | cmd->t_data_nents, | |
2614 | buf, | |
2615 | cmd->data_length); | |
2616 | ||
c66ac9db NB |
2617 | /* |
2618 | * Now perform the XOR against the BIDI read memory located at | |
a1d8b49a | 2619 | * cmd->t_mem_bidi_list |
c66ac9db NB |
2620 | */ |
2621 | ||
2622 | offset = 0; | |
ec98f782 AG |
2623 | for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) { |
2624 | addr = kmap_atomic(sg_page(sg), KM_USER0); | |
2625 | if (!addr) | |
c66ac9db NB |
2626 | goto out; |
2627 | ||
ec98f782 AG |
2628 | for (i = 0; i < sg->length; i++) |
2629 | *(addr + sg->offset + i) ^= *(buf + offset + i); | |
c66ac9db | 2630 | |
ec98f782 | 2631 | offset += sg->length; |
c66ac9db NB |
2632 | kunmap_atomic(addr, KM_USER0); |
2633 | } | |
ec98f782 | 2634 | |
c66ac9db NB |
2635 | out: |
2636 | kfree(buf); | |
2637 | } | |
2638 | ||
2639 | /* | |
2640 | * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd | |
2641 | */ | |
2642 | static int transport_get_sense_data(struct se_cmd *cmd) | |
2643 | { | |
2644 | unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL; | |
42bf829e | 2645 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
2646 | struct se_task *task = NULL, *task_tmp; |
2647 | unsigned long flags; | |
2648 | u32 offset = 0; | |
2649 | ||
e3d6f909 AG |
2650 | WARN_ON(!cmd->se_lun); |
2651 | ||
42bf829e CH |
2652 | if (!dev) |
2653 | return 0; | |
2654 | ||
a1d8b49a | 2655 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 2656 | if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) { |
a1d8b49a | 2657 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
2658 | return 0; |
2659 | } | |
2660 | ||
2661 | list_for_each_entry_safe(task, task_tmp, | |
a1d8b49a | 2662 | &cmd->t_task_list, t_list) { |
c66ac9db NB |
2663 | if (!task->task_sense) |
2664 | continue; | |
2665 | ||
e3d6f909 | 2666 | if (!dev->transport->get_sense_buffer) { |
6708bb27 | 2667 | pr_err("dev->transport->get_sense_buffer" |
c66ac9db NB |
2668 | " is NULL\n"); |
2669 | continue; | |
2670 | } | |
2671 | ||
e3d6f909 | 2672 | sense_buffer = dev->transport->get_sense_buffer(task); |
6708bb27 | 2673 | if (!sense_buffer) { |
04629b7b | 2674 | pr_err("ITT[0x%08x]_TASK[%p]: Unable to locate" |
c66ac9db | 2675 | " sense buffer for task with sense\n", |
04629b7b | 2676 | cmd->se_tfo->get_task_tag(cmd), task); |
c66ac9db NB |
2677 | continue; |
2678 | } | |
a1d8b49a | 2679 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 2680 | |
e3d6f909 | 2681 | offset = cmd->se_tfo->set_fabric_sense_len(cmd, |
c66ac9db NB |
2682 | TRANSPORT_SENSE_BUFFER); |
2683 | ||
5951146d | 2684 | memcpy(&buffer[offset], sense_buffer, |
c66ac9db NB |
2685 | TRANSPORT_SENSE_BUFFER); |
2686 | cmd->scsi_status = task->task_scsi_status; | |
2687 | /* Automatically padded */ | |
2688 | cmd->scsi_sense_length = | |
2689 | (TRANSPORT_SENSE_BUFFER + offset); | |
2690 | ||
6708bb27 | 2691 | pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x" |
c66ac9db | 2692 | " and sense\n", |
e3d6f909 | 2693 | dev->se_hba->hba_id, dev->transport->name, |
c66ac9db NB |
2694 | cmd->scsi_status); |
2695 | return 0; | |
2696 | } | |
a1d8b49a | 2697 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
2698 | |
2699 | return -1; | |
2700 | } | |
2701 | ||
c66ac9db NB |
2702 | static int |
2703 | transport_handle_reservation_conflict(struct se_cmd *cmd) | |
2704 | { | |
c66ac9db NB |
2705 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; |
2706 | cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT; | |
2707 | cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT; | |
2708 | /* | |
2709 | * For UA Interlock Code 11b, a RESERVATION CONFLICT will | |
2710 | * establish a UNIT ATTENTION with PREVIOUS RESERVATION | |
2711 | * CONFLICT STATUS. | |
2712 | * | |
2713 | * See spc4r17, section 7.4.6 Control Mode Page, Table 349 | |
2714 | */ | |
e3d6f909 AG |
2715 | if (cmd->se_sess && |
2716 | cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2) | |
2717 | core_scsi3_ua_allocate(cmd->se_sess->se_node_acl, | |
c66ac9db NB |
2718 | cmd->orig_fe_lun, 0x2C, |
2719 | ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS); | |
5951146d | 2720 | return -EINVAL; |
c66ac9db NB |
2721 | } |
2722 | ||
ec98f782 AG |
2723 | static inline long long transport_dev_end_lba(struct se_device *dev) |
2724 | { | |
2725 | return dev->transport->get_blocks(dev) + 1; | |
2726 | } | |
2727 | ||
2728 | static int transport_cmd_get_valid_sectors(struct se_cmd *cmd) | |
2729 | { | |
2730 | struct se_device *dev = cmd->se_dev; | |
2731 | u32 sectors; | |
2732 | ||
2733 | if (dev->transport->get_device_type(dev) != TYPE_DISK) | |
2734 | return 0; | |
2735 | ||
2736 | sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size); | |
2737 | ||
6708bb27 AG |
2738 | if ((cmd->t_task_lba + sectors) > transport_dev_end_lba(dev)) { |
2739 | pr_err("LBA: %llu Sectors: %u exceeds" | |
ec98f782 AG |
2740 | " transport_dev_end_lba(): %llu\n", |
2741 | cmd->t_task_lba, sectors, | |
2742 | transport_dev_end_lba(dev)); | |
7abbe7f3 | 2743 | return -EINVAL; |
ec98f782 AG |
2744 | } |
2745 | ||
7abbe7f3 | 2746 | return 0; |
ec98f782 AG |
2747 | } |
2748 | ||
706d5860 NB |
2749 | static int target_check_write_same_discard(unsigned char *flags, struct se_device *dev) |
2750 | { | |
2751 | /* | |
2752 | * Determine if the received WRITE_SAME is used to for direct | |
2753 | * passthrough into Linux/SCSI with struct request via TCM/pSCSI | |
2754 | * or we are signaling the use of internal WRITE_SAME + UNMAP=1 | |
2755 | * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code. | |
2756 | */ | |
2757 | int passthrough = (dev->transport->transport_type == | |
2758 | TRANSPORT_PLUGIN_PHBA_PDEV); | |
2759 | ||
2760 | if (!passthrough) { | |
2761 | if ((flags[0] & 0x04) || (flags[0] & 0x02)) { | |
2762 | pr_err("WRITE_SAME PBDATA and LBDATA" | |
2763 | " bits not supported for Block Discard" | |
2764 | " Emulation\n"); | |
2765 | return -ENOSYS; | |
2766 | } | |
2767 | /* | |
2768 | * Currently for the emulated case we only accept | |
2769 | * tpws with the UNMAP=1 bit set. | |
2770 | */ | |
2771 | if (!(flags[0] & 0x08)) { | |
2772 | pr_err("WRITE_SAME w/o UNMAP bit not" | |
2773 | " supported for Block Discard Emulation\n"); | |
2774 | return -ENOSYS; | |
2775 | } | |
2776 | } | |
2777 | ||
2778 | return 0; | |
2779 | } | |
2780 | ||
c66ac9db NB |
2781 | /* transport_generic_cmd_sequencer(): |
2782 | * | |
2783 | * Generic Command Sequencer that should work for most DAS transport | |
2784 | * drivers. | |
2785 | * | |
2786 | * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD | |
2787 | * RX Thread. | |
2788 | * | |
2789 | * FIXME: Need to support other SCSI OPCODES where as well. | |
2790 | */ | |
2791 | static int transport_generic_cmd_sequencer( | |
2792 | struct se_cmd *cmd, | |
2793 | unsigned char *cdb) | |
2794 | { | |
5951146d | 2795 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
2796 | struct se_subsystem_dev *su_dev = dev->se_sub_dev; |
2797 | int ret = 0, sector_ret = 0, passthrough; | |
2798 | u32 sectors = 0, size = 0, pr_reg_type = 0; | |
2799 | u16 service_action; | |
2800 | u8 alua_ascq = 0; | |
2801 | /* | |
2802 | * Check for an existing UNIT ATTENTION condition | |
2803 | */ | |
2804 | if (core_scsi3_ua_check(cmd, cdb) < 0) { | |
c66ac9db NB |
2805 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; |
2806 | cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION; | |
5951146d | 2807 | return -EINVAL; |
c66ac9db NB |
2808 | } |
2809 | /* | |
2810 | * Check status of Asymmetric Logical Unit Assignment port | |
2811 | */ | |
e3d6f909 | 2812 | ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq); |
c66ac9db | 2813 | if (ret != 0) { |
c66ac9db | 2814 | /* |
25985edc | 2815 | * Set SCSI additional sense code (ASC) to 'LUN Not Accessible'; |
c66ac9db NB |
2816 | * The ALUA additional sense code qualifier (ASCQ) is determined |
2817 | * by the ALUA primary or secondary access state.. | |
2818 | */ | |
2819 | if (ret > 0) { | |
2820 | #if 0 | |
6708bb27 | 2821 | pr_debug("[%s]: ALUA TG Port not available," |
c66ac9db | 2822 | " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n", |
e3d6f909 | 2823 | cmd->se_tfo->get_fabric_name(), alua_ascq); |
c66ac9db NB |
2824 | #endif |
2825 | transport_set_sense_codes(cmd, 0x04, alua_ascq); | |
2826 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
2827 | cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY; | |
5951146d | 2828 | return -EINVAL; |
c66ac9db NB |
2829 | } |
2830 | goto out_invalid_cdb_field; | |
2831 | } | |
2832 | /* | |
2833 | * Check status for SPC-3 Persistent Reservations | |
2834 | */ | |
e3d6f909 AG |
2835 | if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type) != 0) { |
2836 | if (su_dev->t10_pr.pr_ops.t10_seq_non_holder( | |
c66ac9db NB |
2837 | cmd, cdb, pr_reg_type) != 0) |
2838 | return transport_handle_reservation_conflict(cmd); | |
2839 | /* | |
2840 | * This means the CDB is allowed for the SCSI Initiator port | |
2841 | * when said port is *NOT* holding the legacy SPC-2 or | |
2842 | * SPC-3 Persistent Reservation. | |
2843 | */ | |
2844 | } | |
2845 | ||
2846 | switch (cdb[0]) { | |
2847 | case READ_6: | |
2848 | sectors = transport_get_sectors_6(cdb, cmd, §or_ret); | |
2849 | if (sector_ret) | |
2850 | goto out_unsupported_cdb; | |
2851 | size = transport_get_size(sectors, cdb, cmd); | |
a1d8b49a | 2852 | cmd->t_task_lba = transport_lba_21(cdb); |
c66ac9db NB |
2853 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2854 | break; | |
2855 | case READ_10: | |
2856 | sectors = transport_get_sectors_10(cdb, cmd, §or_ret); | |
2857 | if (sector_ret) | |
2858 | goto out_unsupported_cdb; | |
2859 | size = transport_get_size(sectors, cdb, cmd); | |
a1d8b49a | 2860 | cmd->t_task_lba = transport_lba_32(cdb); |
c66ac9db NB |
2861 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2862 | break; | |
2863 | case READ_12: | |
2864 | sectors = transport_get_sectors_12(cdb, cmd, §or_ret); | |
2865 | if (sector_ret) | |
2866 | goto out_unsupported_cdb; | |
2867 | size = transport_get_size(sectors, cdb, cmd); | |
a1d8b49a | 2868 | cmd->t_task_lba = transport_lba_32(cdb); |
c66ac9db NB |
2869 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2870 | break; | |
2871 | case READ_16: | |
2872 | sectors = transport_get_sectors_16(cdb, cmd, §or_ret); | |
2873 | if (sector_ret) | |
2874 | goto out_unsupported_cdb; | |
2875 | size = transport_get_size(sectors, cdb, cmd); | |
a1d8b49a | 2876 | cmd->t_task_lba = transport_lba_64(cdb); |
c66ac9db NB |
2877 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2878 | break; | |
2879 | case WRITE_6: | |
2880 | sectors = transport_get_sectors_6(cdb, cmd, §or_ret); | |
2881 | if (sector_ret) | |
2882 | goto out_unsupported_cdb; | |
2883 | size = transport_get_size(sectors, cdb, cmd); | |
a1d8b49a | 2884 | cmd->t_task_lba = transport_lba_21(cdb); |
c66ac9db NB |
2885 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2886 | break; | |
2887 | case WRITE_10: | |
2888 | sectors = transport_get_sectors_10(cdb, cmd, §or_ret); | |
2889 | if (sector_ret) | |
2890 | goto out_unsupported_cdb; | |
2891 | size = transport_get_size(sectors, cdb, cmd); | |
a1d8b49a AG |
2892 | cmd->t_task_lba = transport_lba_32(cdb); |
2893 | cmd->t_tasks_fua = (cdb[1] & 0x8); | |
c66ac9db NB |
2894 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2895 | break; | |
2896 | case WRITE_12: | |
2897 | sectors = transport_get_sectors_12(cdb, cmd, §or_ret); | |
2898 | if (sector_ret) | |
2899 | goto out_unsupported_cdb; | |
2900 | size = transport_get_size(sectors, cdb, cmd); | |
a1d8b49a AG |
2901 | cmd->t_task_lba = transport_lba_32(cdb); |
2902 | cmd->t_tasks_fua = (cdb[1] & 0x8); | |
c66ac9db NB |
2903 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2904 | break; | |
2905 | case WRITE_16: | |
2906 | sectors = transport_get_sectors_16(cdb, cmd, §or_ret); | |
2907 | if (sector_ret) | |
2908 | goto out_unsupported_cdb; | |
2909 | size = transport_get_size(sectors, cdb, cmd); | |
a1d8b49a AG |
2910 | cmd->t_task_lba = transport_lba_64(cdb); |
2911 | cmd->t_tasks_fua = (cdb[1] & 0x8); | |
c66ac9db NB |
2912 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2913 | break; | |
2914 | case XDWRITEREAD_10: | |
2915 | if ((cmd->data_direction != DMA_TO_DEVICE) || | |
a1d8b49a | 2916 | !(cmd->t_tasks_bidi)) |
c66ac9db NB |
2917 | goto out_invalid_cdb_field; |
2918 | sectors = transport_get_sectors_10(cdb, cmd, §or_ret); | |
2919 | if (sector_ret) | |
2920 | goto out_unsupported_cdb; | |
2921 | size = transport_get_size(sectors, cdb, cmd); | |
a1d8b49a | 2922 | cmd->t_task_lba = transport_lba_32(cdb); |
c66ac9db | 2923 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
e3d6f909 | 2924 | passthrough = (dev->transport->transport_type == |
c66ac9db NB |
2925 | TRANSPORT_PLUGIN_PHBA_PDEV); |
2926 | /* | |
2927 | * Skip the remaining assignments for TCM/PSCSI passthrough | |
2928 | */ | |
2929 | if (passthrough) | |
2930 | break; | |
2931 | /* | |
2932 | * Setup BIDI XOR callback to be run during transport_generic_complete_ok() | |
2933 | */ | |
2934 | cmd->transport_complete_callback = &transport_xor_callback; | |
a1d8b49a | 2935 | cmd->t_tasks_fua = (cdb[1] & 0x8); |
c66ac9db NB |
2936 | break; |
2937 | case VARIABLE_LENGTH_CMD: | |
2938 | service_action = get_unaligned_be16(&cdb[8]); | |
2939 | /* | |
2940 | * Determine if this is TCM/PSCSI device and we should disable | |
2941 | * internal emulation for this CDB. | |
2942 | */ | |
e3d6f909 | 2943 | passthrough = (dev->transport->transport_type == |
c66ac9db NB |
2944 | TRANSPORT_PLUGIN_PHBA_PDEV); |
2945 | ||
2946 | switch (service_action) { | |
2947 | case XDWRITEREAD_32: | |
2948 | sectors = transport_get_sectors_32(cdb, cmd, §or_ret); | |
2949 | if (sector_ret) | |
2950 | goto out_unsupported_cdb; | |
2951 | size = transport_get_size(sectors, cdb, cmd); | |
2952 | /* | |
2953 | * Use WRITE_32 and READ_32 opcodes for the emulated | |
2954 | * XDWRITE_READ_32 logic. | |
2955 | */ | |
a1d8b49a | 2956 | cmd->t_task_lba = transport_lba_64_ext(cdb); |
c66ac9db NB |
2957 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
2958 | ||
2959 | /* | |
2960 | * Skip the remaining assignments for TCM/PSCSI passthrough | |
2961 | */ | |
2962 | if (passthrough) | |
2963 | break; | |
2964 | ||
2965 | /* | |
2966 | * Setup BIDI XOR callback to be run during | |
2967 | * transport_generic_complete_ok() | |
2968 | */ | |
2969 | cmd->transport_complete_callback = &transport_xor_callback; | |
a1d8b49a | 2970 | cmd->t_tasks_fua = (cdb[10] & 0x8); |
c66ac9db NB |
2971 | break; |
2972 | case WRITE_SAME_32: | |
2973 | sectors = transport_get_sectors_32(cdb, cmd, §or_ret); | |
2974 | if (sector_ret) | |
2975 | goto out_unsupported_cdb; | |
dd3a5ad8 | 2976 | |
6708bb27 | 2977 | if (sectors) |
12850626 | 2978 | size = transport_get_size(1, cdb, cmd); |
6708bb27 AG |
2979 | else { |
2980 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not" | |
2981 | " supported\n"); | |
2982 | goto out_invalid_cdb_field; | |
2983 | } | |
dd3a5ad8 | 2984 | |
a1d8b49a | 2985 | cmd->t_task_lba = get_unaligned_be64(&cdb[12]); |
c66ac9db NB |
2986 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
2987 | ||
706d5860 | 2988 | if (target_check_write_same_discard(&cdb[10], dev) < 0) |
c66ac9db | 2989 | goto out_invalid_cdb_field; |
706d5860 | 2990 | |
c66ac9db NB |
2991 | break; |
2992 | default: | |
6708bb27 | 2993 | pr_err("VARIABLE_LENGTH_CMD service action" |
c66ac9db NB |
2994 | " 0x%04x not supported\n", service_action); |
2995 | goto out_unsupported_cdb; | |
2996 | } | |
2997 | break; | |
e434f1f1 | 2998 | case MAINTENANCE_IN: |
e3d6f909 | 2999 | if (dev->transport->get_device_type(dev) != TYPE_ROM) { |
c66ac9db NB |
3000 | /* MAINTENANCE_IN from SCC-2 */ |
3001 | /* | |
3002 | * Check for emulated MI_REPORT_TARGET_PGS. | |
3003 | */ | |
3004 | if (cdb[1] == MI_REPORT_TARGET_PGS) { | |
3005 | cmd->transport_emulate_cdb = | |
e3d6f909 | 3006 | (su_dev->t10_alua.alua_type == |
c66ac9db | 3007 | SPC3_ALUA_EMULATED) ? |
e3d6f909 | 3008 | core_emulate_report_target_port_groups : |
c66ac9db NB |
3009 | NULL; |
3010 | } | |
3011 | size = (cdb[6] << 24) | (cdb[7] << 16) | | |
3012 | (cdb[8] << 8) | cdb[9]; | |
3013 | } else { | |
3014 | /* GPCMD_SEND_KEY from multi media commands */ | |
3015 | size = (cdb[8] << 8) + cdb[9]; | |
3016 | } | |
05d1c7c0 | 3017 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
3018 | break; |
3019 | case MODE_SELECT: | |
3020 | size = cdb[4]; | |
3021 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; | |
3022 | break; | |
3023 | case MODE_SELECT_10: | |
3024 | size = (cdb[7] << 8) + cdb[8]; | |
3025 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; | |
3026 | break; | |
3027 | case MODE_SENSE: | |
3028 | size = cdb[4]; | |
05d1c7c0 | 3029 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
3030 | break; |
3031 | case MODE_SENSE_10: | |
3032 | case GPCMD_READ_BUFFER_CAPACITY: | |
3033 | case GPCMD_SEND_OPC: | |
3034 | case LOG_SELECT: | |
3035 | case LOG_SENSE: | |
3036 | size = (cdb[7] << 8) + cdb[8]; | |
05d1c7c0 | 3037 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
3038 | break; |
3039 | case READ_BLOCK_LIMITS: | |
3040 | size = READ_BLOCK_LEN; | |
05d1c7c0 | 3041 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
3042 | break; |
3043 | case GPCMD_GET_CONFIGURATION: | |
3044 | case GPCMD_READ_FORMAT_CAPACITIES: | |
3045 | case GPCMD_READ_DISC_INFO: | |
3046 | case GPCMD_READ_TRACK_RZONE_INFO: | |
3047 | size = (cdb[7] << 8) + cdb[8]; | |
3048 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; | |
3049 | break; | |
3050 | case PERSISTENT_RESERVE_IN: | |
3051 | case PERSISTENT_RESERVE_OUT: | |
3052 | cmd->transport_emulate_cdb = | |
e3d6f909 | 3053 | (su_dev->t10_pr.res_type == |
c66ac9db | 3054 | SPC3_PERSISTENT_RESERVATIONS) ? |
e3d6f909 | 3055 | core_scsi3_emulate_pr : NULL; |
c66ac9db | 3056 | size = (cdb[7] << 8) + cdb[8]; |
05d1c7c0 | 3057 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
3058 | break; |
3059 | case GPCMD_MECHANISM_STATUS: | |
3060 | case GPCMD_READ_DVD_STRUCTURE: | |
3061 | size = (cdb[8] << 8) + cdb[9]; | |
3062 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; | |
3063 | break; | |
3064 | case READ_POSITION: | |
3065 | size = READ_POSITION_LEN; | |
05d1c7c0 | 3066 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db | 3067 | break; |
e434f1f1 | 3068 | case MAINTENANCE_OUT: |
e3d6f909 | 3069 | if (dev->transport->get_device_type(dev) != TYPE_ROM) { |
c66ac9db NB |
3070 | /* MAINTENANCE_OUT from SCC-2 |
3071 | * | |
3072 | * Check for emulated MO_SET_TARGET_PGS. | |
3073 | */ | |
3074 | if (cdb[1] == MO_SET_TARGET_PGS) { | |
3075 | cmd->transport_emulate_cdb = | |
e3d6f909 | 3076 | (su_dev->t10_alua.alua_type == |
c66ac9db | 3077 | SPC3_ALUA_EMULATED) ? |
e3d6f909 | 3078 | core_emulate_set_target_port_groups : |
c66ac9db NB |
3079 | NULL; |
3080 | } | |
3081 | ||
3082 | size = (cdb[6] << 24) | (cdb[7] << 16) | | |
3083 | (cdb[8] << 8) | cdb[9]; | |
3084 | } else { | |
3085 | /* GPCMD_REPORT_KEY from multi media commands */ | |
3086 | size = (cdb[8] << 8) + cdb[9]; | |
3087 | } | |
05d1c7c0 | 3088 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
3089 | break; |
3090 | case INQUIRY: | |
3091 | size = (cdb[3] << 8) + cdb[4]; | |
3092 | /* | |
3093 | * Do implict HEAD_OF_QUEUE processing for INQUIRY. | |
3094 | * See spc4r17 section 5.3 | |
3095 | */ | |
5951146d | 3096 | if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) |
e66ecd50 | 3097 | cmd->sam_task_attr = MSG_HEAD_TAG; |
05d1c7c0 | 3098 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
3099 | break; |
3100 | case READ_BUFFER: | |
3101 | size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8]; | |
05d1c7c0 | 3102 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
3103 | break; |
3104 | case READ_CAPACITY: | |
3105 | size = READ_CAP_LEN; | |
05d1c7c0 | 3106 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
3107 | break; |
3108 | case READ_MEDIA_SERIAL_NUMBER: | |
3109 | case SECURITY_PROTOCOL_IN: | |
3110 | case SECURITY_PROTOCOL_OUT: | |
3111 | size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; | |
05d1c7c0 | 3112 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
3113 | break; |
3114 | case SERVICE_ACTION_IN: | |
3115 | case ACCESS_CONTROL_IN: | |
3116 | case ACCESS_CONTROL_OUT: | |
3117 | case EXTENDED_COPY: | |
3118 | case READ_ATTRIBUTE: | |
3119 | case RECEIVE_COPY_RESULTS: | |
3120 | case WRITE_ATTRIBUTE: | |
3121 | size = (cdb[10] << 24) | (cdb[11] << 16) | | |
3122 | (cdb[12] << 8) | cdb[13]; | |
05d1c7c0 | 3123 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
3124 | break; |
3125 | case RECEIVE_DIAGNOSTIC: | |
3126 | case SEND_DIAGNOSTIC: | |
3127 | size = (cdb[3] << 8) | cdb[4]; | |
05d1c7c0 | 3128 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
3129 | break; |
3130 | /* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */ | |
3131 | #if 0 | |
3132 | case GPCMD_READ_CD: | |
3133 | sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8]; | |
3134 | size = (2336 * sectors); | |
05d1c7c0 | 3135 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
3136 | break; |
3137 | #endif | |
3138 | case READ_TOC: | |
3139 | size = cdb[8]; | |
05d1c7c0 | 3140 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
3141 | break; |
3142 | case REQUEST_SENSE: | |
3143 | size = cdb[4]; | |
05d1c7c0 | 3144 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
3145 | break; |
3146 | case READ_ELEMENT_STATUS: | |
3147 | size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9]; | |
05d1c7c0 | 3148 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
3149 | break; |
3150 | case WRITE_BUFFER: | |
3151 | size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8]; | |
05d1c7c0 | 3152 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
3153 | break; |
3154 | case RESERVE: | |
3155 | case RESERVE_10: | |
3156 | /* | |
3157 | * The SPC-2 RESERVE does not contain a size in the SCSI CDB. | |
3158 | * Assume the passthrough or $FABRIC_MOD will tell us about it. | |
3159 | */ | |
3160 | if (cdb[0] == RESERVE_10) | |
3161 | size = (cdb[7] << 8) | cdb[8]; | |
3162 | else | |
3163 | size = cmd->data_length; | |
3164 | ||
3165 | /* | |
3166 | * Setup the legacy emulated handler for SPC-2 and | |
3167 | * >= SPC-3 compatible reservation handling (CRH=1) | |
3168 | * Otherwise, we assume the underlying SCSI logic is | |
3169 | * is running in SPC_PASSTHROUGH, and wants reservations | |
3170 | * emulation disabled. | |
3171 | */ | |
3172 | cmd->transport_emulate_cdb = | |
e3d6f909 | 3173 | (su_dev->t10_pr.res_type != |
c66ac9db | 3174 | SPC_PASSTHROUGH) ? |
e3d6f909 | 3175 | core_scsi2_emulate_crh : NULL; |
c66ac9db NB |
3176 | cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB; |
3177 | break; | |
3178 | case RELEASE: | |
3179 | case RELEASE_10: | |
3180 | /* | |
3181 | * The SPC-2 RELEASE does not contain a size in the SCSI CDB. | |
3182 | * Assume the passthrough or $FABRIC_MOD will tell us about it. | |
3183 | */ | |
3184 | if (cdb[0] == RELEASE_10) | |
3185 | size = (cdb[7] << 8) | cdb[8]; | |
3186 | else | |
3187 | size = cmd->data_length; | |
3188 | ||
3189 | cmd->transport_emulate_cdb = | |
e3d6f909 | 3190 | (su_dev->t10_pr.res_type != |
c66ac9db | 3191 | SPC_PASSTHROUGH) ? |
e3d6f909 | 3192 | core_scsi2_emulate_crh : NULL; |
c66ac9db NB |
3193 | cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB; |
3194 | break; | |
3195 | case SYNCHRONIZE_CACHE: | |
3196 | case 0x91: /* SYNCHRONIZE_CACHE_16: */ | |
3197 | /* | |
3198 | * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE | |
3199 | */ | |
3200 | if (cdb[0] == SYNCHRONIZE_CACHE) { | |
3201 | sectors = transport_get_sectors_10(cdb, cmd, §or_ret); | |
a1d8b49a | 3202 | cmd->t_task_lba = transport_lba_32(cdb); |
c66ac9db NB |
3203 | } else { |
3204 | sectors = transport_get_sectors_16(cdb, cmd, §or_ret); | |
a1d8b49a | 3205 | cmd->t_task_lba = transport_lba_64(cdb); |
c66ac9db NB |
3206 | } |
3207 | if (sector_ret) | |
3208 | goto out_unsupported_cdb; | |
3209 | ||
3210 | size = transport_get_size(sectors, cdb, cmd); | |
3211 | cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB; | |
3212 | ||
3213 | /* | |
3214 | * For TCM/pSCSI passthrough, skip cmd->transport_emulate_cdb() | |
3215 | */ | |
e3d6f909 | 3216 | if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) |
c66ac9db NB |
3217 | break; |
3218 | /* | |
3219 | * Set SCF_EMULATE_CDB_ASYNC to ensure asynchronous operation | |
3220 | * for SYNCHRONIZE_CACHE* Immed=1 case in __transport_execute_tasks() | |
3221 | */ | |
3222 | cmd->se_cmd_flags |= SCF_EMULATE_CDB_ASYNC; | |
3223 | /* | |
3224 | * Check to ensure that LBA + Range does not exceed past end of | |
7abbe7f3 | 3225 | * device for IBLOCK and FILEIO ->do_sync_cache() backend calls |
c66ac9db | 3226 | */ |
7abbe7f3 NB |
3227 | if ((cmd->t_task_lba != 0) || (sectors != 0)) { |
3228 | if (transport_cmd_get_valid_sectors(cmd) < 0) | |
3229 | goto out_invalid_cdb_field; | |
3230 | } | |
c66ac9db NB |
3231 | break; |
3232 | case UNMAP: | |
3233 | size = get_unaligned_be16(&cdb[7]); | |
05d1c7c0 | 3234 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
3235 | break; |
3236 | case WRITE_SAME_16: | |
3237 | sectors = transport_get_sectors_16(cdb, cmd, §or_ret); | |
3238 | if (sector_ret) | |
3239 | goto out_unsupported_cdb; | |
dd3a5ad8 | 3240 | |
6708bb27 | 3241 | if (sectors) |
12850626 | 3242 | size = transport_get_size(1, cdb, cmd); |
6708bb27 AG |
3243 | else { |
3244 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); | |
3245 | goto out_invalid_cdb_field; | |
3246 | } | |
dd3a5ad8 | 3247 | |
5db0753b | 3248 | cmd->t_task_lba = get_unaligned_be64(&cdb[2]); |
706d5860 NB |
3249 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
3250 | ||
3251 | if (target_check_write_same_discard(&cdb[1], dev) < 0) | |
3252 | goto out_invalid_cdb_field; | |
3253 | break; | |
3254 | case WRITE_SAME: | |
3255 | sectors = transport_get_sectors_10(cdb, cmd, §or_ret); | |
3256 | if (sector_ret) | |
3257 | goto out_unsupported_cdb; | |
3258 | ||
3259 | if (sectors) | |
12850626 | 3260 | size = transport_get_size(1, cdb, cmd); |
706d5860 NB |
3261 | else { |
3262 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); | |
3263 | goto out_invalid_cdb_field; | |
c66ac9db | 3264 | } |
706d5860 NB |
3265 | |
3266 | cmd->t_task_lba = get_unaligned_be32(&cdb[2]); | |
c66ac9db | 3267 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
706d5860 NB |
3268 | /* |
3269 | * Follow sbcr26 with WRITE_SAME (10) and check for the existence | |
3270 | * of byte 1 bit 3 UNMAP instead of original reserved field | |
3271 | */ | |
3272 | if (target_check_write_same_discard(&cdb[1], dev) < 0) | |
3273 | goto out_invalid_cdb_field; | |
c66ac9db NB |
3274 | break; |
3275 | case ALLOW_MEDIUM_REMOVAL: | |
3276 | case GPCMD_CLOSE_TRACK: | |
3277 | case ERASE: | |
3278 | case INITIALIZE_ELEMENT_STATUS: | |
3279 | case GPCMD_LOAD_UNLOAD: | |
3280 | case REZERO_UNIT: | |
3281 | case SEEK_10: | |
3282 | case GPCMD_SET_SPEED: | |
3283 | case SPACE: | |
3284 | case START_STOP: | |
3285 | case TEST_UNIT_READY: | |
3286 | case VERIFY: | |
3287 | case WRITE_FILEMARKS: | |
3288 | case MOVE_MEDIUM: | |
3289 | cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB; | |
3290 | break; | |
3291 | case REPORT_LUNS: | |
3292 | cmd->transport_emulate_cdb = | |
e3d6f909 | 3293 | transport_core_report_lun_response; |
c66ac9db NB |
3294 | size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; |
3295 | /* | |
3296 | * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS | |
3297 | * See spc4r17 section 5.3 | |
3298 | */ | |
5951146d | 3299 | if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) |
e66ecd50 | 3300 | cmd->sam_task_attr = MSG_HEAD_TAG; |
05d1c7c0 | 3301 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
c66ac9db NB |
3302 | break; |
3303 | default: | |
6708bb27 | 3304 | pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode" |
c66ac9db | 3305 | " 0x%02x, sending CHECK_CONDITION.\n", |
e3d6f909 | 3306 | cmd->se_tfo->get_fabric_name(), cdb[0]); |
c66ac9db NB |
3307 | goto out_unsupported_cdb; |
3308 | } | |
3309 | ||
3310 | if (size != cmd->data_length) { | |
6708bb27 | 3311 | pr_warn("TARGET_CORE[%s]: Expected Transfer Length:" |
c66ac9db | 3312 | " %u does not match SCSI CDB Length: %u for SAM Opcode:" |
e3d6f909 | 3313 | " 0x%02x\n", cmd->se_tfo->get_fabric_name(), |
c66ac9db NB |
3314 | cmd->data_length, size, cdb[0]); |
3315 | ||
3316 | cmd->cmd_spdtl = size; | |
3317 | ||
3318 | if (cmd->data_direction == DMA_TO_DEVICE) { | |
6708bb27 | 3319 | pr_err("Rejecting underflow/overflow" |
c66ac9db NB |
3320 | " WRITE data\n"); |
3321 | goto out_invalid_cdb_field; | |
3322 | } | |
3323 | /* | |
3324 | * Reject READ_* or WRITE_* with overflow/underflow for | |
3325 | * type SCF_SCSI_DATA_SG_IO_CDB. | |
3326 | */ | |
6708bb27 AG |
3327 | if (!ret && (dev->se_sub_dev->se_dev_attrib.block_size != 512)) { |
3328 | pr_err("Failing OVERFLOW/UNDERFLOW for LBA op" | |
c66ac9db | 3329 | " CDB on non 512-byte sector setup subsystem" |
e3d6f909 | 3330 | " plugin: %s\n", dev->transport->name); |
c66ac9db NB |
3331 | /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */ |
3332 | goto out_invalid_cdb_field; | |
3333 | } | |
3334 | ||
3335 | if (size > cmd->data_length) { | |
3336 | cmd->se_cmd_flags |= SCF_OVERFLOW_BIT; | |
3337 | cmd->residual_count = (size - cmd->data_length); | |
3338 | } else { | |
3339 | cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT; | |
3340 | cmd->residual_count = (cmd->data_length - size); | |
3341 | } | |
3342 | cmd->data_length = size; | |
3343 | } | |
3344 | ||
d0229ae3 AG |
3345 | /* Let's limit control cdbs to a page, for simplicity's sake. */ |
3346 | if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) && | |
3347 | size > PAGE_SIZE) | |
3348 | goto out_invalid_cdb_field; | |
3349 | ||
c66ac9db NB |
3350 | transport_set_supported_SAM_opcode(cmd); |
3351 | return ret; | |
3352 | ||
3353 | out_unsupported_cdb: | |
3354 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
3355 | cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; | |
5951146d | 3356 | return -EINVAL; |
c66ac9db NB |
3357 | out_invalid_cdb_field: |
3358 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
3359 | cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; | |
5951146d | 3360 | return -EINVAL; |
c66ac9db NB |
3361 | } |
3362 | ||
c66ac9db NB |
3363 | /* |
3364 | * Called from transport_generic_complete_ok() and | |
3365 | * transport_generic_request_failure() to determine which dormant/delayed | |
3366 | * and ordered cmds need to have their tasks added to the execution queue. | |
3367 | */ | |
3368 | static void transport_complete_task_attr(struct se_cmd *cmd) | |
3369 | { | |
5951146d | 3370 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
3371 | struct se_cmd *cmd_p, *cmd_tmp; |
3372 | int new_active_tasks = 0; | |
3373 | ||
e66ecd50 | 3374 | if (cmd->sam_task_attr == MSG_SIMPLE_TAG) { |
c66ac9db NB |
3375 | atomic_dec(&dev->simple_cmds); |
3376 | smp_mb__after_atomic_dec(); | |
3377 | dev->dev_cur_ordered_id++; | |
6708bb27 | 3378 | pr_debug("Incremented dev->dev_cur_ordered_id: %u for" |
c66ac9db NB |
3379 | " SIMPLE: %u\n", dev->dev_cur_ordered_id, |
3380 | cmd->se_ordered_id); | |
e66ecd50 | 3381 | } else if (cmd->sam_task_attr == MSG_HEAD_TAG) { |
c66ac9db NB |
3382 | atomic_dec(&dev->dev_hoq_count); |
3383 | smp_mb__after_atomic_dec(); | |
3384 | dev->dev_cur_ordered_id++; | |
6708bb27 | 3385 | pr_debug("Incremented dev_cur_ordered_id: %u for" |
c66ac9db NB |
3386 | " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id, |
3387 | cmd->se_ordered_id); | |
e66ecd50 | 3388 | } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) { |
c66ac9db | 3389 | spin_lock(&dev->ordered_cmd_lock); |
5951146d | 3390 | list_del(&cmd->se_ordered_node); |
c66ac9db NB |
3391 | atomic_dec(&dev->dev_ordered_sync); |
3392 | smp_mb__after_atomic_dec(); | |
3393 | spin_unlock(&dev->ordered_cmd_lock); | |
3394 | ||
3395 | dev->dev_cur_ordered_id++; | |
6708bb27 | 3396 | pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:" |
c66ac9db NB |
3397 | " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id); |
3398 | } | |
3399 | /* | |
3400 | * Process all commands up to the last received | |
3401 | * ORDERED task attribute which requires another blocking | |
3402 | * boundary | |
3403 | */ | |
3404 | spin_lock(&dev->delayed_cmd_lock); | |
3405 | list_for_each_entry_safe(cmd_p, cmd_tmp, | |
5951146d | 3406 | &dev->delayed_cmd_list, se_delayed_node) { |
c66ac9db | 3407 | |
5951146d | 3408 | list_del(&cmd_p->se_delayed_node); |
c66ac9db NB |
3409 | spin_unlock(&dev->delayed_cmd_lock); |
3410 | ||
6708bb27 | 3411 | pr_debug("Calling add_tasks() for" |
c66ac9db NB |
3412 | " cmd_p: 0x%02x Task Attr: 0x%02x" |
3413 | " Dormant -> Active, se_ordered_id: %u\n", | |
6708bb27 | 3414 | cmd_p->t_task_cdb[0], |
c66ac9db NB |
3415 | cmd_p->sam_task_attr, cmd_p->se_ordered_id); |
3416 | ||
3417 | transport_add_tasks_from_cmd(cmd_p); | |
3418 | new_active_tasks++; | |
3419 | ||
3420 | spin_lock(&dev->delayed_cmd_lock); | |
e66ecd50 | 3421 | if (cmd_p->sam_task_attr == MSG_ORDERED_TAG) |
c66ac9db NB |
3422 | break; |
3423 | } | |
3424 | spin_unlock(&dev->delayed_cmd_lock); | |
3425 | /* | |
3426 | * If new tasks have become active, wake up the transport thread | |
3427 | * to do the processing of the Active tasks. | |
3428 | */ | |
3429 | if (new_active_tasks != 0) | |
e3d6f909 | 3430 | wake_up_interruptible(&dev->dev_queue_obj.thread_wq); |
c66ac9db NB |
3431 | } |
3432 | ||
e057f533 | 3433 | static void transport_complete_qf(struct se_cmd *cmd) |
07bde79a NB |
3434 | { |
3435 | int ret = 0; | |
3436 | ||
e057f533 CH |
3437 | transport_stop_all_task_timers(cmd); |
3438 | if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) | |
3439 | transport_complete_task_attr(cmd); | |
3440 | ||
3441 | if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) { | |
3442 | ret = cmd->se_tfo->queue_status(cmd); | |
3443 | if (ret) | |
3444 | goto out; | |
3445 | } | |
07bde79a NB |
3446 | |
3447 | switch (cmd->data_direction) { | |
3448 | case DMA_FROM_DEVICE: | |
3449 | ret = cmd->se_tfo->queue_data_in(cmd); | |
3450 | break; | |
3451 | case DMA_TO_DEVICE: | |
ec98f782 | 3452 | if (cmd->t_bidi_data_sg) { |
07bde79a NB |
3453 | ret = cmd->se_tfo->queue_data_in(cmd); |
3454 | if (ret < 0) | |
e057f533 | 3455 | break; |
07bde79a NB |
3456 | } |
3457 | /* Fall through for DMA_TO_DEVICE */ | |
3458 | case DMA_NONE: | |
3459 | ret = cmd->se_tfo->queue_status(cmd); | |
3460 | break; | |
3461 | default: | |
3462 | break; | |
3463 | } | |
3464 | ||
e057f533 CH |
3465 | out: |
3466 | if (ret < 0) { | |
3467 | transport_handle_queue_full(cmd, cmd->se_dev); | |
3468 | return; | |
3469 | } | |
3470 | transport_lun_remove_cmd(cmd); | |
3471 | transport_cmd_check_stop_to_fabric(cmd); | |
07bde79a NB |
3472 | } |
3473 | ||
3474 | static void transport_handle_queue_full( | |
3475 | struct se_cmd *cmd, | |
e057f533 | 3476 | struct se_device *dev) |
07bde79a NB |
3477 | { |
3478 | spin_lock_irq(&dev->qf_cmd_lock); | |
3479 | cmd->se_cmd_flags |= SCF_EMULATE_QUEUE_FULL; | |
07bde79a NB |
3480 | list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list); |
3481 | atomic_inc(&dev->dev_qf_count); | |
3482 | smp_mb__after_atomic_inc(); | |
3483 | spin_unlock_irq(&cmd->se_dev->qf_cmd_lock); | |
3484 | ||
3485 | schedule_work(&cmd->se_dev->qf_work_queue); | |
3486 | } | |
3487 | ||
c66ac9db NB |
3488 | static void transport_generic_complete_ok(struct se_cmd *cmd) |
3489 | { | |
07bde79a | 3490 | int reason = 0, ret; |
c66ac9db NB |
3491 | /* |
3492 | * Check if we need to move delayed/dormant tasks from cmds on the | |
3493 | * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task | |
3494 | * Attribute. | |
3495 | */ | |
5951146d | 3496 | if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) |
c66ac9db | 3497 | transport_complete_task_attr(cmd); |
07bde79a NB |
3498 | /* |
3499 | * Check to schedule QUEUE_FULL work, or execute an existing | |
3500 | * cmd->transport_qf_callback() | |
3501 | */ | |
3502 | if (atomic_read(&cmd->se_dev->dev_qf_count) != 0) | |
3503 | schedule_work(&cmd->se_dev->qf_work_queue); | |
3504 | ||
c66ac9db NB |
3505 | /* |
3506 | * Check if we need to retrieve a sense buffer from | |
3507 | * the struct se_cmd in question. | |
3508 | */ | |
3509 | if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) { | |
3510 | if (transport_get_sense_data(cmd) < 0) | |
3511 | reason = TCM_NON_EXISTENT_LUN; | |
3512 | ||
3513 | /* | |
3514 | * Only set when an struct se_task->task_scsi_status returned | |
3515 | * a non GOOD status. | |
3516 | */ | |
3517 | if (cmd->scsi_status) { | |
07bde79a | 3518 | ret = transport_send_check_condition_and_sense( |
c66ac9db | 3519 | cmd, reason, 1); |
07bde79a NB |
3520 | if (ret == -EAGAIN) |
3521 | goto queue_full; | |
3522 | ||
c66ac9db NB |
3523 | transport_lun_remove_cmd(cmd); |
3524 | transport_cmd_check_stop_to_fabric(cmd); | |
3525 | return; | |
3526 | } | |
3527 | } | |
3528 | /* | |
25985edc | 3529 | * Check for a callback, used by amongst other things |
c66ac9db NB |
3530 | * XDWRITE_READ_10 emulation. |
3531 | */ | |
3532 | if (cmd->transport_complete_callback) | |
3533 | cmd->transport_complete_callback(cmd); | |
3534 | ||
3535 | switch (cmd->data_direction) { | |
3536 | case DMA_FROM_DEVICE: | |
3537 | spin_lock(&cmd->se_lun->lun_sep_lock); | |
e3d6f909 AG |
3538 | if (cmd->se_lun->lun_sep) { |
3539 | cmd->se_lun->lun_sep->sep_stats.tx_data_octets += | |
c66ac9db NB |
3540 | cmd->data_length; |
3541 | } | |
3542 | spin_unlock(&cmd->se_lun->lun_sep_lock); | |
c66ac9db | 3543 | |
07bde79a NB |
3544 | ret = cmd->se_tfo->queue_data_in(cmd); |
3545 | if (ret == -EAGAIN) | |
3546 | goto queue_full; | |
c66ac9db NB |
3547 | break; |
3548 | case DMA_TO_DEVICE: | |
3549 | spin_lock(&cmd->se_lun->lun_sep_lock); | |
e3d6f909 AG |
3550 | if (cmd->se_lun->lun_sep) { |
3551 | cmd->se_lun->lun_sep->sep_stats.rx_data_octets += | |
c66ac9db NB |
3552 | cmd->data_length; |
3553 | } | |
3554 | spin_unlock(&cmd->se_lun->lun_sep_lock); | |
3555 | /* | |
3556 | * Check if we need to send READ payload for BIDI-COMMAND | |
3557 | */ | |
ec98f782 | 3558 | if (cmd->t_bidi_data_sg) { |
c66ac9db | 3559 | spin_lock(&cmd->se_lun->lun_sep_lock); |
e3d6f909 AG |
3560 | if (cmd->se_lun->lun_sep) { |
3561 | cmd->se_lun->lun_sep->sep_stats.tx_data_octets += | |
c66ac9db NB |
3562 | cmd->data_length; |
3563 | } | |
3564 | spin_unlock(&cmd->se_lun->lun_sep_lock); | |
07bde79a NB |
3565 | ret = cmd->se_tfo->queue_data_in(cmd); |
3566 | if (ret == -EAGAIN) | |
3567 | goto queue_full; | |
c66ac9db NB |
3568 | break; |
3569 | } | |
3570 | /* Fall through for DMA_TO_DEVICE */ | |
3571 | case DMA_NONE: | |
07bde79a NB |
3572 | ret = cmd->se_tfo->queue_status(cmd); |
3573 | if (ret == -EAGAIN) | |
3574 | goto queue_full; | |
c66ac9db NB |
3575 | break; |
3576 | default: | |
3577 | break; | |
3578 | } | |
3579 | ||
3580 | transport_lun_remove_cmd(cmd); | |
3581 | transport_cmd_check_stop_to_fabric(cmd); | |
07bde79a NB |
3582 | return; |
3583 | ||
3584 | queue_full: | |
6708bb27 | 3585 | pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p," |
07bde79a | 3586 | " data_direction: %d\n", cmd, cmd->data_direction); |
e057f533 CH |
3587 | cmd->t_state = TRANSPORT_COMPLETE_QF_OK; |
3588 | transport_handle_queue_full(cmd, cmd->se_dev); | |
c66ac9db NB |
3589 | } |
3590 | ||
3591 | static void transport_free_dev_tasks(struct se_cmd *cmd) | |
3592 | { | |
3593 | struct se_task *task, *task_tmp; | |
3594 | unsigned long flags; | |
3595 | ||
a1d8b49a | 3596 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 3597 | list_for_each_entry_safe(task, task_tmp, |
a1d8b49a | 3598 | &cmd->t_task_list, t_list) { |
6c76bf95 | 3599 | if (task->task_flags & TF_ACTIVE) |
c66ac9db NB |
3600 | continue; |
3601 | ||
3602 | kfree(task->task_sg_bidi); | |
3603 | kfree(task->task_sg); | |
3604 | ||
3605 | list_del(&task->t_list); | |
3606 | ||
a1d8b49a | 3607 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
42bf829e | 3608 | cmd->se_dev->transport->free_task(task); |
a1d8b49a | 3609 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 3610 | } |
a1d8b49a | 3611 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
3612 | } |
3613 | ||
6708bb27 | 3614 | static inline void transport_free_sgl(struct scatterlist *sgl, int nents) |
c66ac9db | 3615 | { |
ec98f782 | 3616 | struct scatterlist *sg; |
ec98f782 | 3617 | int count; |
c66ac9db | 3618 | |
6708bb27 AG |
3619 | for_each_sg(sgl, sg, nents, count) |
3620 | __free_page(sg_page(sg)); | |
c66ac9db | 3621 | |
6708bb27 AG |
3622 | kfree(sgl); |
3623 | } | |
c66ac9db | 3624 | |
6708bb27 AG |
3625 | static inline void transport_free_pages(struct se_cmd *cmd) |
3626 | { | |
3627 | if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) | |
3628 | return; | |
3629 | ||
3630 | transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents); | |
ec98f782 AG |
3631 | cmd->t_data_sg = NULL; |
3632 | cmd->t_data_nents = 0; | |
c66ac9db | 3633 | |
6708bb27 | 3634 | transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents); |
ec98f782 AG |
3635 | cmd->t_bidi_data_sg = NULL; |
3636 | cmd->t_bidi_data_nents = 0; | |
c66ac9db NB |
3637 | } |
3638 | ||
d3df7825 CH |
3639 | /** |
3640 | * transport_put_cmd - release a reference to a command | |
3641 | * @cmd: command to release | |
3642 | * | |
3643 | * This routine releases our reference to the command and frees it if possible. | |
3644 | */ | |
39c05f32 | 3645 | static void transport_put_cmd(struct se_cmd *cmd) |
c66ac9db NB |
3646 | { |
3647 | unsigned long flags; | |
4911e3cc | 3648 | int free_tasks = 0; |
c66ac9db | 3649 | |
a1d8b49a | 3650 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
4911e3cc CH |
3651 | if (atomic_read(&cmd->t_fe_count)) { |
3652 | if (!atomic_dec_and_test(&cmd->t_fe_count)) | |
3653 | goto out_busy; | |
3654 | } | |
3655 | ||
3656 | if (atomic_read(&cmd->t_se_count)) { | |
3657 | if (!atomic_dec_and_test(&cmd->t_se_count)) | |
3658 | goto out_busy; | |
3659 | } | |
3660 | ||
3661 | if (atomic_read(&cmd->transport_dev_active)) { | |
3662 | atomic_set(&cmd->transport_dev_active, 0); | |
3663 | transport_all_task_dev_remove_state(cmd); | |
3664 | free_tasks = 1; | |
c66ac9db | 3665 | } |
a1d8b49a | 3666 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 3667 | |
4911e3cc CH |
3668 | if (free_tasks != 0) |
3669 | transport_free_dev_tasks(cmd); | |
d3df7825 | 3670 | |
c66ac9db | 3671 | transport_free_pages(cmd); |
31afc39c | 3672 | transport_release_cmd(cmd); |
39c05f32 | 3673 | return; |
4911e3cc CH |
3674 | out_busy: |
3675 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
c66ac9db NB |
3676 | } |
3677 | ||
c66ac9db | 3678 | /* |
ec98f782 AG |
3679 | * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of |
3680 | * allocating in the core. | |
c66ac9db NB |
3681 | * @cmd: Associated se_cmd descriptor |
3682 | * @mem: SGL style memory for TCM WRITE / READ | |
3683 | * @sg_mem_num: Number of SGL elements | |
3684 | * @mem_bidi_in: SGL style memory for TCM BIDI READ | |
3685 | * @sg_mem_bidi_num: Number of BIDI READ SGL elements | |
3686 | * | |
3687 | * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage | |
3688 | * of parameters. | |
3689 | */ | |
3690 | int transport_generic_map_mem_to_cmd( | |
3691 | struct se_cmd *cmd, | |
5951146d AG |
3692 | struct scatterlist *sgl, |
3693 | u32 sgl_count, | |
3694 | struct scatterlist *sgl_bidi, | |
3695 | u32 sgl_bidi_count) | |
c66ac9db | 3696 | { |
5951146d | 3697 | if (!sgl || !sgl_count) |
c66ac9db | 3698 | return 0; |
c66ac9db | 3699 | |
c66ac9db NB |
3700 | if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) || |
3701 | (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) { | |
c66ac9db | 3702 | |
ec98f782 AG |
3703 | cmd->t_data_sg = sgl; |
3704 | cmd->t_data_nents = sgl_count; | |
c66ac9db | 3705 | |
ec98f782 AG |
3706 | if (sgl_bidi && sgl_bidi_count) { |
3707 | cmd->t_bidi_data_sg = sgl_bidi; | |
3708 | cmd->t_bidi_data_nents = sgl_bidi_count; | |
c66ac9db NB |
3709 | } |
3710 | cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC; | |
c66ac9db NB |
3711 | } |
3712 | ||
3713 | return 0; | |
3714 | } | |
3715 | EXPORT_SYMBOL(transport_generic_map_mem_to_cmd); | |
3716 | ||
c66ac9db NB |
3717 | static int transport_new_cmd_obj(struct se_cmd *cmd) |
3718 | { | |
5951146d | 3719 | struct se_device *dev = cmd->se_dev; |
01cde4d5 | 3720 | int set_counts = 1, rc, task_cdbs; |
c66ac9db | 3721 | |
ec98f782 AG |
3722 | /* |
3723 | * Setup any BIDI READ tasks and memory from | |
3724 | * cmd->t_mem_bidi_list so the READ struct se_tasks | |
3725 | * are queued first for the non pSCSI passthrough case. | |
3726 | */ | |
3727 | if (cmd->t_bidi_data_sg && | |
3728 | (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV)) { | |
3729 | rc = transport_allocate_tasks(cmd, | |
3730 | cmd->t_task_lba, | |
3731 | DMA_FROM_DEVICE, | |
3732 | cmd->t_bidi_data_sg, | |
3733 | cmd->t_bidi_data_nents); | |
6708bb27 | 3734 | if (rc <= 0) { |
c66ac9db NB |
3735 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; |
3736 | cmd->scsi_sense_reason = | |
ec98f782 | 3737 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
01cde4d5 | 3738 | return -EINVAL; |
c66ac9db | 3739 | } |
ec98f782 AG |
3740 | atomic_inc(&cmd->t_fe_count); |
3741 | atomic_inc(&cmd->t_se_count); | |
3742 | set_counts = 0; | |
3743 | } | |
3744 | /* | |
3745 | * Setup the tasks and memory from cmd->t_mem_list | |
3746 | * Note for BIDI transfers this will contain the WRITE payload | |
3747 | */ | |
3748 | task_cdbs = transport_allocate_tasks(cmd, | |
3749 | cmd->t_task_lba, | |
3750 | cmd->data_direction, | |
3751 | cmd->t_data_sg, | |
3752 | cmd->t_data_nents); | |
6708bb27 | 3753 | if (task_cdbs <= 0) { |
ec98f782 AG |
3754 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; |
3755 | cmd->scsi_sense_reason = | |
3756 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
01cde4d5 | 3757 | return -EINVAL; |
ec98f782 | 3758 | } |
c66ac9db | 3759 | |
ec98f782 AG |
3760 | if (set_counts) { |
3761 | atomic_inc(&cmd->t_fe_count); | |
3762 | atomic_inc(&cmd->t_se_count); | |
c66ac9db NB |
3763 | } |
3764 | ||
ec98f782 AG |
3765 | cmd->t_task_list_num = task_cdbs; |
3766 | ||
a1d8b49a AG |
3767 | atomic_set(&cmd->t_task_cdbs_left, task_cdbs); |
3768 | atomic_set(&cmd->t_task_cdbs_ex_left, task_cdbs); | |
3769 | atomic_set(&cmd->t_task_cdbs_timeout_left, task_cdbs); | |
c66ac9db NB |
3770 | return 0; |
3771 | } | |
3772 | ||
05d1c7c0 AG |
3773 | void *transport_kmap_first_data_page(struct se_cmd *cmd) |
3774 | { | |
ec98f782 | 3775 | struct scatterlist *sg = cmd->t_data_sg; |
05d1c7c0 | 3776 | |
ec98f782 | 3777 | BUG_ON(!sg); |
05d1c7c0 | 3778 | /* |
ec98f782 AG |
3779 | * We need to take into account a possible offset here for fabrics like |
3780 | * tcm_loop who may be using a contig buffer from the SCSI midlayer for | |
3781 | * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd() | |
05d1c7c0 | 3782 | */ |
ec98f782 | 3783 | return kmap(sg_page(sg)) + sg->offset; |
05d1c7c0 AG |
3784 | } |
3785 | EXPORT_SYMBOL(transport_kmap_first_data_page); | |
3786 | ||
3787 | void transport_kunmap_first_data_page(struct se_cmd *cmd) | |
3788 | { | |
ec98f782 | 3789 | kunmap(sg_page(cmd->t_data_sg)); |
05d1c7c0 AG |
3790 | } |
3791 | EXPORT_SYMBOL(transport_kunmap_first_data_page); | |
3792 | ||
c66ac9db | 3793 | static int |
05d1c7c0 | 3794 | transport_generic_get_mem(struct se_cmd *cmd) |
c66ac9db | 3795 | { |
ec98f782 AG |
3796 | u32 length = cmd->data_length; |
3797 | unsigned int nents; | |
3798 | struct page *page; | |
3799 | int i = 0; | |
c66ac9db | 3800 | |
ec98f782 AG |
3801 | nents = DIV_ROUND_UP(length, PAGE_SIZE); |
3802 | cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL); | |
3803 | if (!cmd->t_data_sg) | |
3804 | return -ENOMEM; | |
c66ac9db | 3805 | |
ec98f782 AG |
3806 | cmd->t_data_nents = nents; |
3807 | sg_init_table(cmd->t_data_sg, nents); | |
c66ac9db | 3808 | |
ec98f782 AG |
3809 | while (length) { |
3810 | u32 page_len = min_t(u32, length, PAGE_SIZE); | |
3811 | page = alloc_page(GFP_KERNEL | __GFP_ZERO); | |
3812 | if (!page) | |
3813 | goto out; | |
c66ac9db | 3814 | |
ec98f782 AG |
3815 | sg_set_page(&cmd->t_data_sg[i], page, page_len, 0); |
3816 | length -= page_len; | |
3817 | i++; | |
c66ac9db | 3818 | } |
c66ac9db | 3819 | return 0; |
c66ac9db | 3820 | |
ec98f782 AG |
3821 | out: |
3822 | while (i >= 0) { | |
3823 | __free_page(sg_page(&cmd->t_data_sg[i])); | |
3824 | i--; | |
c66ac9db | 3825 | } |
ec98f782 AG |
3826 | kfree(cmd->t_data_sg); |
3827 | cmd->t_data_sg = NULL; | |
3828 | return -ENOMEM; | |
c66ac9db NB |
3829 | } |
3830 | ||
a1d8b49a AG |
3831 | /* Reduce sectors if they are too long for the device */ |
3832 | static inline sector_t transport_limit_task_sectors( | |
c66ac9db NB |
3833 | struct se_device *dev, |
3834 | unsigned long long lba, | |
a1d8b49a | 3835 | sector_t sectors) |
c66ac9db | 3836 | { |
a1d8b49a | 3837 | sectors = min_t(sector_t, sectors, dev->se_sub_dev->se_dev_attrib.max_sectors); |
c66ac9db | 3838 | |
a1d8b49a AG |
3839 | if (dev->transport->get_device_type(dev) == TYPE_DISK) |
3840 | if ((lba + sectors) > transport_dev_end_lba(dev)) | |
3841 | sectors = ((transport_dev_end_lba(dev) - lba) + 1); | |
c66ac9db | 3842 | |
a1d8b49a | 3843 | return sectors; |
c66ac9db NB |
3844 | } |
3845 | ||
c66ac9db NB |
3846 | |
3847 | /* | |
3848 | * This function can be used by HW target mode drivers to create a linked | |
3849 | * scatterlist from all contiguously allocated struct se_task->task_sg[]. | |
3850 | * This is intended to be called during the completion path by TCM Core | |
3851 | * when struct target_core_fabric_ops->check_task_sg_chaining is enabled. | |
3852 | */ | |
3853 | void transport_do_task_sg_chain(struct se_cmd *cmd) | |
3854 | { | |
ec98f782 AG |
3855 | struct scatterlist *sg_first = NULL; |
3856 | struct scatterlist *sg_prev = NULL; | |
3857 | int sg_prev_nents = 0; | |
3858 | struct scatterlist *sg; | |
c66ac9db | 3859 | struct se_task *task; |
ec98f782 | 3860 | u32 chained_nents = 0; |
c66ac9db NB |
3861 | int i; |
3862 | ||
ec98f782 AG |
3863 | BUG_ON(!cmd->se_tfo->task_sg_chaining); |
3864 | ||
c66ac9db NB |
3865 | /* |
3866 | * Walk the struct se_task list and setup scatterlist chains | |
a1d8b49a | 3867 | * for each contiguously allocated struct se_task->task_sg[]. |
c66ac9db | 3868 | */ |
a1d8b49a | 3869 | list_for_each_entry(task, &cmd->t_task_list, t_list) { |
ec98f782 | 3870 | if (!task->task_sg) |
c66ac9db NB |
3871 | continue; |
3872 | ||
ec98f782 AG |
3873 | if (!sg_first) { |
3874 | sg_first = task->task_sg; | |
6708bb27 | 3875 | chained_nents = task->task_sg_nents; |
97868c89 | 3876 | } else { |
ec98f782 | 3877 | sg_chain(sg_prev, sg_prev_nents, task->task_sg); |
6708bb27 | 3878 | chained_nents += task->task_sg_nents; |
97868c89 | 3879 | } |
c3c74c7a NB |
3880 | /* |
3881 | * For the padded tasks, use the extra SGL vector allocated | |
3882 | * in transport_allocate_data_tasks() for the sg_prev_nents | |
04629b7b CH |
3883 | * offset into sg_chain() above. |
3884 | * | |
3885 | * We do not need the padding for the last task (or a single | |
3886 | * task), but in that case we will never use the sg_prev_nents | |
3887 | * value below which would be incorrect. | |
c3c74c7a | 3888 | */ |
04629b7b | 3889 | sg_prev_nents = (task->task_sg_nents + 1); |
ec98f782 | 3890 | sg_prev = task->task_sg; |
c66ac9db NB |
3891 | } |
3892 | /* | |
3893 | * Setup the starting pointer and total t_tasks_sg_linked_no including | |
3894 | * padding SGs for linking and to mark the end. | |
3895 | */ | |
a1d8b49a | 3896 | cmd->t_tasks_sg_chained = sg_first; |
ec98f782 | 3897 | cmd->t_tasks_sg_chained_no = chained_nents; |
c66ac9db | 3898 | |
6708bb27 | 3899 | pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and" |
a1d8b49a AG |
3900 | " t_tasks_sg_chained_no: %u\n", cmd, cmd->t_tasks_sg_chained, |
3901 | cmd->t_tasks_sg_chained_no); | |
c66ac9db | 3902 | |
a1d8b49a AG |
3903 | for_each_sg(cmd->t_tasks_sg_chained, sg, |
3904 | cmd->t_tasks_sg_chained_no, i) { | |
c66ac9db | 3905 | |
6708bb27 | 3906 | pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n", |
5951146d | 3907 | i, sg, sg_page(sg), sg->length, sg->offset); |
c66ac9db | 3908 | if (sg_is_chain(sg)) |
6708bb27 | 3909 | pr_debug("SG: %p sg_is_chain=1\n", sg); |
c66ac9db | 3910 | if (sg_is_last(sg)) |
6708bb27 | 3911 | pr_debug("SG: %p sg_is_last=1\n", sg); |
c66ac9db | 3912 | } |
c66ac9db NB |
3913 | } |
3914 | EXPORT_SYMBOL(transport_do_task_sg_chain); | |
3915 | ||
a1d8b49a AG |
3916 | /* |
3917 | * Break up cmd into chunks transport can handle | |
3918 | */ | |
ec98f782 | 3919 | static int transport_allocate_data_tasks( |
c66ac9db NB |
3920 | struct se_cmd *cmd, |
3921 | unsigned long long lba, | |
c66ac9db | 3922 | enum dma_data_direction data_direction, |
ec98f782 AG |
3923 | struct scatterlist *sgl, |
3924 | unsigned int sgl_nents) | |
c66ac9db | 3925 | { |
c66ac9db | 3926 | struct se_task *task; |
5951146d | 3927 | struct se_device *dev = cmd->se_dev; |
ec98f782 | 3928 | unsigned long flags; |
a3eedc22 | 3929 | int task_count, i; |
277c5f27 | 3930 | sector_t sectors, dev_max_sectors = dev->se_sub_dev->se_dev_attrib.max_sectors; |
ec98f782 AG |
3931 | u32 sector_size = dev->se_sub_dev->se_dev_attrib.block_size; |
3932 | struct scatterlist *sg; | |
3933 | struct scatterlist *cmd_sg; | |
a1d8b49a | 3934 | |
ec98f782 AG |
3935 | WARN_ON(cmd->data_length % sector_size); |
3936 | sectors = DIV_ROUND_UP(cmd->data_length, sector_size); | |
277c5f27 NB |
3937 | task_count = DIV_ROUND_UP_SECTOR_T(sectors, dev_max_sectors); |
3938 | ||
ec98f782 AG |
3939 | cmd_sg = sgl; |
3940 | for (i = 0; i < task_count; i++) { | |
c3c74c7a | 3941 | unsigned int task_size, task_sg_nents_padded; |
ec98f782 | 3942 | int count; |
a1d8b49a | 3943 | |
c66ac9db | 3944 | task = transport_generic_get_task(cmd, data_direction); |
a1d8b49a | 3945 | if (!task) |
ec98f782 | 3946 | return -ENOMEM; |
c66ac9db | 3947 | |
c66ac9db | 3948 | task->task_lba = lba; |
ec98f782 AG |
3949 | task->task_sectors = min(sectors, dev_max_sectors); |
3950 | task->task_size = task->task_sectors * sector_size; | |
c66ac9db | 3951 | |
525a48a2 NB |
3952 | /* |
3953 | * This now assumes that passed sg_ents are in PAGE_SIZE chunks | |
3954 | * in order to calculate the number per task SGL entries | |
3955 | */ | |
3956 | task->task_sg_nents = DIV_ROUND_UP(task->task_size, PAGE_SIZE); | |
c66ac9db | 3957 | /* |
ec98f782 AG |
3958 | * Check if the fabric module driver is requesting that all |
3959 | * struct se_task->task_sg[] be chained together.. If so, | |
3960 | * then allocate an extra padding SG entry for linking and | |
c3c74c7a NB |
3961 | * marking the end of the chained SGL for every task except |
3962 | * the last one for (task_count > 1) operation, or skipping | |
3963 | * the extra padding for the (task_count == 1) case. | |
c66ac9db | 3964 | */ |
c3c74c7a NB |
3965 | if (cmd->se_tfo->task_sg_chaining && (i < (task_count - 1))) { |
3966 | task_sg_nents_padded = (task->task_sg_nents + 1); | |
c3c74c7a NB |
3967 | } else |
3968 | task_sg_nents_padded = task->task_sg_nents; | |
c66ac9db | 3969 | |
1d20bb61 | 3970 | task->task_sg = kmalloc(sizeof(struct scatterlist) * |
c3c74c7a | 3971 | task_sg_nents_padded, GFP_KERNEL); |
ec98f782 AG |
3972 | if (!task->task_sg) { |
3973 | cmd->se_dev->transport->free_task(task); | |
3974 | return -ENOMEM; | |
3975 | } | |
3976 | ||
c3c74c7a | 3977 | sg_init_table(task->task_sg, task_sg_nents_padded); |
c66ac9db | 3978 | |
ec98f782 AG |
3979 | task_size = task->task_size; |
3980 | ||
3981 | /* Build new sgl, only up to task_size */ | |
6708bb27 | 3982 | for_each_sg(task->task_sg, sg, task->task_sg_nents, count) { |
ec98f782 AG |
3983 | if (cmd_sg->length > task_size) |
3984 | break; | |
3985 | ||
3986 | *sg = *cmd_sg; | |
3987 | task_size -= cmd_sg->length; | |
3988 | cmd_sg = sg_next(cmd_sg); | |
c66ac9db | 3989 | } |
c66ac9db | 3990 | |
ec98f782 AG |
3991 | lba += task->task_sectors; |
3992 | sectors -= task->task_sectors; | |
c66ac9db | 3993 | |
ec98f782 AG |
3994 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
3995 | list_add_tail(&task->t_list, &cmd->t_task_list); | |
3996 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
c66ac9db NB |
3997 | } |
3998 | ||
ec98f782 | 3999 | return task_count; |
c66ac9db NB |
4000 | } |
4001 | ||
4002 | static int | |
ec98f782 | 4003 | transport_allocate_control_task(struct se_cmd *cmd) |
c66ac9db | 4004 | { |
c66ac9db | 4005 | struct se_task *task; |
ec98f782 | 4006 | unsigned long flags; |
c66ac9db NB |
4007 | |
4008 | task = transport_generic_get_task(cmd, cmd->data_direction); | |
4009 | if (!task) | |
ec98f782 | 4010 | return -ENOMEM; |
c66ac9db | 4011 | |
ec98f782 AG |
4012 | task->task_sg = kmalloc(sizeof(struct scatterlist) * cmd->t_data_nents, |
4013 | GFP_KERNEL); | |
4014 | if (!task->task_sg) { | |
4015 | cmd->se_dev->transport->free_task(task); | |
4016 | return -ENOMEM; | |
4017 | } | |
4018 | ||
4019 | memcpy(task->task_sg, cmd->t_data_sg, | |
4020 | sizeof(struct scatterlist) * cmd->t_data_nents); | |
c66ac9db | 4021 | task->task_size = cmd->data_length; |
6708bb27 | 4022 | task->task_sg_nents = cmd->t_data_nents; |
c66ac9db | 4023 | |
ec98f782 AG |
4024 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
4025 | list_add_tail(&task->t_list, &cmd->t_task_list); | |
4026 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
c66ac9db | 4027 | |
6708bb27 | 4028 | /* Success! Return number of tasks allocated */ |
a3eedc22 | 4029 | return 1; |
ec98f782 AG |
4030 | } |
4031 | ||
4032 | static u32 transport_allocate_tasks( | |
4033 | struct se_cmd *cmd, | |
4034 | unsigned long long lba, | |
4035 | enum dma_data_direction data_direction, | |
4036 | struct scatterlist *sgl, | |
4037 | unsigned int sgl_nents) | |
4038 | { | |
01cde4d5 NB |
4039 | if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) { |
4040 | if (transport_cmd_get_valid_sectors(cmd) < 0) | |
4041 | return -EINVAL; | |
4042 | ||
ec98f782 AG |
4043 | return transport_allocate_data_tasks(cmd, lba, data_direction, |
4044 | sgl, sgl_nents); | |
01cde4d5 | 4045 | } else |
6708bb27 AG |
4046 | return transport_allocate_control_task(cmd); |
4047 | ||
c66ac9db NB |
4048 | } |
4049 | ||
ec98f782 | 4050 | |
c66ac9db NB |
4051 | /* transport_generic_new_cmd(): Called from transport_processing_thread() |
4052 | * | |
4053 | * Allocate storage transport resources from a set of values predefined | |
4054 | * by transport_generic_cmd_sequencer() from the iSCSI Target RX process. | |
4055 | * Any non zero return here is treated as an "out of resource' op here. | |
4056 | */ | |
4057 | /* | |
4058 | * Generate struct se_task(s) and/or their payloads for this CDB. | |
4059 | */ | |
a1d8b49a | 4060 | int transport_generic_new_cmd(struct se_cmd *cmd) |
c66ac9db | 4061 | { |
c66ac9db NB |
4062 | int ret = 0; |
4063 | ||
4064 | /* | |
4065 | * Determine is the TCM fabric module has already allocated physical | |
4066 | * memory, and is directly calling transport_generic_map_mem_to_cmd() | |
ec98f782 | 4067 | * beforehand. |
c66ac9db | 4068 | */ |
ec98f782 AG |
4069 | if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) && |
4070 | cmd->data_length) { | |
05d1c7c0 | 4071 | ret = transport_generic_get_mem(cmd); |
c66ac9db NB |
4072 | if (ret < 0) |
4073 | return ret; | |
4074 | } | |
1d20bb61 NB |
4075 | /* |
4076 | * Call transport_new_cmd_obj() to invoke transport_allocate_tasks() for | |
4077 | * control or data CDB types, and perform the map to backend subsystem | |
4078 | * code from SGL memory allocated here by transport_generic_get_mem(), or | |
4079 | * via pre-existing SGL memory setup explictly by fabric module code with | |
4080 | * transport_generic_map_mem_to_cmd(). | |
4081 | */ | |
c66ac9db NB |
4082 | ret = transport_new_cmd_obj(cmd); |
4083 | if (ret < 0) | |
4084 | return ret; | |
c66ac9db | 4085 | /* |
a1d8b49a | 4086 | * For WRITEs, let the fabric know its buffer is ready.. |
c66ac9db NB |
4087 | * This WRITE struct se_cmd (and all of its associated struct se_task's) |
4088 | * will be added to the struct se_device execution queue after its WRITE | |
4089 | * data has arrived. (ie: It gets handled by the transport processing | |
4090 | * thread a second time) | |
4091 | */ | |
4092 | if (cmd->data_direction == DMA_TO_DEVICE) { | |
4093 | transport_add_tasks_to_state_queue(cmd); | |
4094 | return transport_generic_write_pending(cmd); | |
4095 | } | |
4096 | /* | |
4097 | * Everything else but a WRITE, add the struct se_cmd's struct se_task's | |
4098 | * to the execution queue. | |
4099 | */ | |
4100 | transport_execute_tasks(cmd); | |
4101 | return 0; | |
4102 | } | |
a1d8b49a | 4103 | EXPORT_SYMBOL(transport_generic_new_cmd); |
c66ac9db NB |
4104 | |
4105 | /* transport_generic_process_write(): | |
4106 | * | |
4107 | * | |
4108 | */ | |
4109 | void transport_generic_process_write(struct se_cmd *cmd) | |
4110 | { | |
c66ac9db NB |
4111 | transport_execute_tasks(cmd); |
4112 | } | |
4113 | EXPORT_SYMBOL(transport_generic_process_write); | |
4114 | ||
e057f533 | 4115 | static void transport_write_pending_qf(struct se_cmd *cmd) |
07bde79a | 4116 | { |
e057f533 CH |
4117 | if (cmd->se_tfo->write_pending(cmd) == -EAGAIN) { |
4118 | pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", | |
4119 | cmd); | |
4120 | transport_handle_queue_full(cmd, cmd->se_dev); | |
4121 | } | |
07bde79a NB |
4122 | } |
4123 | ||
c66ac9db NB |
4124 | static int transport_generic_write_pending(struct se_cmd *cmd) |
4125 | { | |
4126 | unsigned long flags; | |
4127 | int ret; | |
4128 | ||
a1d8b49a | 4129 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 4130 | cmd->t_state = TRANSPORT_WRITE_PENDING; |
a1d8b49a | 4131 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
07bde79a | 4132 | |
c66ac9db NB |
4133 | /* |
4134 | * Clear the se_cmd for WRITE_PENDING status in order to set | |
a1d8b49a | 4135 | * cmd->t_transport_active=0 so that transport_generic_handle_data |
c66ac9db | 4136 | * can be called from HW target mode interrupt code. This is safe |
e3d6f909 | 4137 | * to be called with transport_off=1 before the cmd->se_tfo->write_pending |
c66ac9db NB |
4138 | * because the se_cmd->se_lun pointer is not being cleared. |
4139 | */ | |
4140 | transport_cmd_check_stop(cmd, 1, 0); | |
4141 | ||
4142 | /* | |
4143 | * Call the fabric write_pending function here to let the | |
4144 | * frontend know that WRITE buffers are ready. | |
4145 | */ | |
e3d6f909 | 4146 | ret = cmd->se_tfo->write_pending(cmd); |
07bde79a NB |
4147 | if (ret == -EAGAIN) |
4148 | goto queue_full; | |
4149 | else if (ret < 0) | |
c66ac9db NB |
4150 | return ret; |
4151 | ||
4152 | return PYX_TRANSPORT_WRITE_PENDING; | |
07bde79a NB |
4153 | |
4154 | queue_full: | |
6708bb27 | 4155 | pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd); |
07bde79a | 4156 | cmd->t_state = TRANSPORT_COMPLETE_QF_WP; |
e057f533 | 4157 | transport_handle_queue_full(cmd, cmd->se_dev); |
07bde79a | 4158 | return ret; |
c66ac9db NB |
4159 | } |
4160 | ||
2dbc43d2 CH |
4161 | /** |
4162 | * transport_release_cmd - free a command | |
4163 | * @cmd: command to free | |
4164 | * | |
4165 | * This routine unconditionally frees a command, and reference counting | |
4166 | * or list removal must be done in the caller. | |
4167 | */ | |
35462975 | 4168 | void transport_release_cmd(struct se_cmd *cmd) |
c66ac9db | 4169 | { |
e3d6f909 | 4170 | BUG_ON(!cmd->se_tfo); |
c66ac9db | 4171 | |
2dbc43d2 CH |
4172 | if (cmd->se_tmr_req) |
4173 | core_tmr_release_req(cmd->se_tmr_req); | |
4174 | if (cmd->t_task_cdb != cmd->__t_task_cdb) | |
4175 | kfree(cmd->t_task_cdb); | |
35462975 | 4176 | cmd->se_tfo->release_cmd(cmd); |
c66ac9db | 4177 | } |
35462975 | 4178 | EXPORT_SYMBOL(transport_release_cmd); |
c66ac9db | 4179 | |
39c05f32 | 4180 | void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks) |
c66ac9db | 4181 | { |
d14921d6 NB |
4182 | if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) { |
4183 | if (wait_for_tasks && cmd->se_tmr_req) | |
4184 | transport_wait_for_tasks(cmd); | |
4185 | ||
35462975 | 4186 | transport_release_cmd(cmd); |
d14921d6 NB |
4187 | } else { |
4188 | if (wait_for_tasks) | |
4189 | transport_wait_for_tasks(cmd); | |
4190 | ||
c66ac9db NB |
4191 | core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd); |
4192 | ||
82f1c8a4 | 4193 | if (cmd->se_lun) |
c66ac9db | 4194 | transport_lun_remove_cmd(cmd); |
c66ac9db | 4195 | |
f4366772 NB |
4196 | transport_free_dev_tasks(cmd); |
4197 | ||
39c05f32 | 4198 | transport_put_cmd(cmd); |
c66ac9db NB |
4199 | } |
4200 | } | |
4201 | EXPORT_SYMBOL(transport_generic_free_cmd); | |
4202 | ||
c66ac9db NB |
4203 | /* transport_lun_wait_for_tasks(): |
4204 | * | |
4205 | * Called from ConfigFS context to stop the passed struct se_cmd to allow | |
4206 | * an struct se_lun to be successfully shutdown. | |
4207 | */ | |
4208 | static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun) | |
4209 | { | |
4210 | unsigned long flags; | |
4211 | int ret; | |
4212 | /* | |
4213 | * If the frontend has already requested this struct se_cmd to | |
4214 | * be stopped, we can safely ignore this struct se_cmd. | |
4215 | */ | |
a1d8b49a AG |
4216 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
4217 | if (atomic_read(&cmd->t_transport_stop)) { | |
4218 | atomic_set(&cmd->transport_lun_stop, 0); | |
6708bb27 | 4219 | pr_debug("ConfigFS ITT[0x%08x] - t_transport_stop ==" |
e3d6f909 | 4220 | " TRUE, skipping\n", cmd->se_tfo->get_task_tag(cmd)); |
a1d8b49a | 4221 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 4222 | transport_cmd_check_stop(cmd, 1, 0); |
e3d6f909 | 4223 | return -EPERM; |
c66ac9db | 4224 | } |
a1d8b49a AG |
4225 | atomic_set(&cmd->transport_lun_fe_stop, 1); |
4226 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
c66ac9db | 4227 | |
5951146d | 4228 | wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq); |
c66ac9db NB |
4229 | |
4230 | ret = transport_stop_tasks_for_cmd(cmd); | |
4231 | ||
6708bb27 AG |
4232 | pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:" |
4233 | " %d\n", cmd, cmd->t_task_list_num, ret); | |
c66ac9db | 4234 | if (!ret) { |
6708bb27 | 4235 | pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n", |
e3d6f909 | 4236 | cmd->se_tfo->get_task_tag(cmd)); |
a1d8b49a | 4237 | wait_for_completion(&cmd->transport_lun_stop_comp); |
6708bb27 | 4238 | pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n", |
e3d6f909 | 4239 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 4240 | } |
5951146d | 4241 | transport_remove_cmd_from_queue(cmd, &cmd->se_dev->dev_queue_obj); |
c66ac9db NB |
4242 | |
4243 | return 0; | |
4244 | } | |
4245 | ||
c66ac9db NB |
4246 | static void __transport_clear_lun_from_sessions(struct se_lun *lun) |
4247 | { | |
4248 | struct se_cmd *cmd = NULL; | |
4249 | unsigned long lun_flags, cmd_flags; | |
4250 | /* | |
4251 | * Do exception processing and return CHECK_CONDITION status to the | |
4252 | * Initiator Port. | |
4253 | */ | |
4254 | spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags); | |
5951146d AG |
4255 | while (!list_empty(&lun->lun_cmd_list)) { |
4256 | cmd = list_first_entry(&lun->lun_cmd_list, | |
4257 | struct se_cmd, se_lun_node); | |
4258 | list_del(&cmd->se_lun_node); | |
4259 | ||
a1d8b49a | 4260 | atomic_set(&cmd->transport_lun_active, 0); |
c66ac9db NB |
4261 | /* |
4262 | * This will notify iscsi_target_transport.c: | |
4263 | * transport_cmd_check_stop() that a LUN shutdown is in | |
4264 | * progress for the iscsi_cmd_t. | |
4265 | */ | |
a1d8b49a | 4266 | spin_lock(&cmd->t_state_lock); |
6708bb27 | 4267 | pr_debug("SE_LUN[%d] - Setting cmd->transport" |
c66ac9db | 4268 | "_lun_stop for ITT: 0x%08x\n", |
e3d6f909 AG |
4269 | cmd->se_lun->unpacked_lun, |
4270 | cmd->se_tfo->get_task_tag(cmd)); | |
a1d8b49a AG |
4271 | atomic_set(&cmd->transport_lun_stop, 1); |
4272 | spin_unlock(&cmd->t_state_lock); | |
c66ac9db NB |
4273 | |
4274 | spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags); | |
4275 | ||
6708bb27 AG |
4276 | if (!cmd->se_lun) { |
4277 | pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n", | |
e3d6f909 AG |
4278 | cmd->se_tfo->get_task_tag(cmd), |
4279 | cmd->se_tfo->get_cmd_state(cmd), cmd->t_state); | |
c66ac9db NB |
4280 | BUG(); |
4281 | } | |
4282 | /* | |
4283 | * If the Storage engine still owns the iscsi_cmd_t, determine | |
4284 | * and/or stop its context. | |
4285 | */ | |
6708bb27 | 4286 | pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport" |
e3d6f909 AG |
4287 | "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun, |
4288 | cmd->se_tfo->get_task_tag(cmd)); | |
c66ac9db | 4289 | |
e3d6f909 | 4290 | if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) { |
c66ac9db NB |
4291 | spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags); |
4292 | continue; | |
4293 | } | |
4294 | ||
6708bb27 | 4295 | pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun" |
c66ac9db | 4296 | "_wait_for_tasks(): SUCCESS\n", |
e3d6f909 AG |
4297 | cmd->se_lun->unpacked_lun, |
4298 | cmd->se_tfo->get_task_tag(cmd)); | |
c66ac9db | 4299 | |
a1d8b49a | 4300 | spin_lock_irqsave(&cmd->t_state_lock, cmd_flags); |
6708bb27 | 4301 | if (!atomic_read(&cmd->transport_dev_active)) { |
a1d8b49a | 4302 | spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags); |
c66ac9db NB |
4303 | goto check_cond; |
4304 | } | |
a1d8b49a | 4305 | atomic_set(&cmd->transport_dev_active, 0); |
c66ac9db | 4306 | transport_all_task_dev_remove_state(cmd); |
a1d8b49a | 4307 | spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags); |
c66ac9db NB |
4308 | |
4309 | transport_free_dev_tasks(cmd); | |
4310 | /* | |
4311 | * The Storage engine stopped this struct se_cmd before it was | |
4312 | * send to the fabric frontend for delivery back to the | |
4313 | * Initiator Node. Return this SCSI CDB back with an | |
4314 | * CHECK_CONDITION status. | |
4315 | */ | |
4316 | check_cond: | |
4317 | transport_send_check_condition_and_sense(cmd, | |
4318 | TCM_NON_EXISTENT_LUN, 0); | |
4319 | /* | |
4320 | * If the fabric frontend is waiting for this iscsi_cmd_t to | |
4321 | * be released, notify the waiting thread now that LU has | |
4322 | * finished accessing it. | |
4323 | */ | |
a1d8b49a AG |
4324 | spin_lock_irqsave(&cmd->t_state_lock, cmd_flags); |
4325 | if (atomic_read(&cmd->transport_lun_fe_stop)) { | |
6708bb27 | 4326 | pr_debug("SE_LUN[%d] - Detected FE stop for" |
c66ac9db NB |
4327 | " struct se_cmd: %p ITT: 0x%08x\n", |
4328 | lun->unpacked_lun, | |
e3d6f909 | 4329 | cmd, cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 4330 | |
a1d8b49a | 4331 | spin_unlock_irqrestore(&cmd->t_state_lock, |
c66ac9db NB |
4332 | cmd_flags); |
4333 | transport_cmd_check_stop(cmd, 1, 0); | |
a1d8b49a | 4334 | complete(&cmd->transport_lun_fe_stop_comp); |
c66ac9db NB |
4335 | spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags); |
4336 | continue; | |
4337 | } | |
6708bb27 | 4338 | pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n", |
e3d6f909 | 4339 | lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 4340 | |
a1d8b49a | 4341 | spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags); |
c66ac9db NB |
4342 | spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags); |
4343 | } | |
4344 | spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags); | |
4345 | } | |
4346 | ||
4347 | static int transport_clear_lun_thread(void *p) | |
4348 | { | |
4349 | struct se_lun *lun = (struct se_lun *)p; | |
4350 | ||
4351 | __transport_clear_lun_from_sessions(lun); | |
4352 | complete(&lun->lun_shutdown_comp); | |
4353 | ||
4354 | return 0; | |
4355 | } | |
4356 | ||
4357 | int transport_clear_lun_from_sessions(struct se_lun *lun) | |
4358 | { | |
4359 | struct task_struct *kt; | |
4360 | ||
5951146d | 4361 | kt = kthread_run(transport_clear_lun_thread, lun, |
c66ac9db NB |
4362 | "tcm_cl_%u", lun->unpacked_lun); |
4363 | if (IS_ERR(kt)) { | |
6708bb27 | 4364 | pr_err("Unable to start clear_lun thread\n"); |
e3d6f909 | 4365 | return PTR_ERR(kt); |
c66ac9db NB |
4366 | } |
4367 | wait_for_completion(&lun->lun_shutdown_comp); | |
4368 | ||
4369 | return 0; | |
4370 | } | |
4371 | ||
d14921d6 NB |
4372 | /** |
4373 | * transport_wait_for_tasks - wait for completion to occur | |
4374 | * @cmd: command to wait | |
c66ac9db | 4375 | * |
d14921d6 NB |
4376 | * Called from frontend fabric context to wait for storage engine |
4377 | * to pause and/or release frontend generated struct se_cmd. | |
c66ac9db | 4378 | */ |
d14921d6 | 4379 | void transport_wait_for_tasks(struct se_cmd *cmd) |
c66ac9db NB |
4380 | { |
4381 | unsigned long flags; | |
4382 | ||
a1d8b49a | 4383 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
d14921d6 NB |
4384 | if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && !(cmd->se_tmr_req)) { |
4385 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
4386 | return; | |
4387 | } | |
4388 | /* | |
4389 | * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE | |
4390 | * has been set in transport_set_supported_SAM_opcode(). | |
4391 | */ | |
4392 | if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) && !cmd->se_tmr_req) { | |
4393 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
4394 | return; | |
4395 | } | |
c66ac9db NB |
4396 | /* |
4397 | * If we are already stopped due to an external event (ie: LUN shutdown) | |
4398 | * sleep until the connection can have the passed struct se_cmd back. | |
a1d8b49a | 4399 | * The cmd->transport_lun_stopped_sem will be upped by |
c66ac9db NB |
4400 | * transport_clear_lun_from_sessions() once the ConfigFS context caller |
4401 | * has completed its operation on the struct se_cmd. | |
4402 | */ | |
a1d8b49a | 4403 | if (atomic_read(&cmd->transport_lun_stop)) { |
c66ac9db | 4404 | |
6708bb27 | 4405 | pr_debug("wait_for_tasks: Stopping" |
e3d6f909 | 4406 | " wait_for_completion(&cmd->t_tasktransport_lun_fe" |
c66ac9db | 4407 | "_stop_comp); for ITT: 0x%08x\n", |
e3d6f909 | 4408 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db NB |
4409 | /* |
4410 | * There is a special case for WRITES where a FE exception + | |
4411 | * LUN shutdown means ConfigFS context is still sleeping on | |
4412 | * transport_lun_stop_comp in transport_lun_wait_for_tasks(). | |
4413 | * We go ahead and up transport_lun_stop_comp just to be sure | |
4414 | * here. | |
4415 | */ | |
a1d8b49a AG |
4416 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
4417 | complete(&cmd->transport_lun_stop_comp); | |
4418 | wait_for_completion(&cmd->transport_lun_fe_stop_comp); | |
4419 | spin_lock_irqsave(&cmd->t_state_lock, flags); | |
c66ac9db NB |
4420 | |
4421 | transport_all_task_dev_remove_state(cmd); | |
4422 | /* | |
4423 | * At this point, the frontend who was the originator of this | |
4424 | * struct se_cmd, now owns the structure and can be released through | |
4425 | * normal means below. | |
4426 | */ | |
6708bb27 | 4427 | pr_debug("wait_for_tasks: Stopped" |
e3d6f909 | 4428 | " wait_for_completion(&cmd->t_tasktransport_lun_fe_" |
c66ac9db | 4429 | "stop_comp); for ITT: 0x%08x\n", |
e3d6f909 | 4430 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 4431 | |
a1d8b49a | 4432 | atomic_set(&cmd->transport_lun_stop, 0); |
c66ac9db | 4433 | } |
a1d8b49a | 4434 | if (!atomic_read(&cmd->t_transport_active) || |
d14921d6 NB |
4435 | atomic_read(&cmd->t_transport_aborted)) { |
4436 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
4437 | return; | |
4438 | } | |
c66ac9db | 4439 | |
a1d8b49a | 4440 | atomic_set(&cmd->t_transport_stop, 1); |
c66ac9db | 4441 | |
6708bb27 | 4442 | pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x" |
c66ac9db | 4443 | " i_state: %d, t_state/def_t_state: %d/%d, t_transport_stop" |
e3d6f909 AG |
4444 | " = TRUE\n", cmd, cmd->se_tfo->get_task_tag(cmd), |
4445 | cmd->se_tfo->get_cmd_state(cmd), cmd->t_state, | |
c66ac9db NB |
4446 | cmd->deferred_t_state); |
4447 | ||
a1d8b49a | 4448 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 4449 | |
5951146d | 4450 | wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq); |
c66ac9db | 4451 | |
a1d8b49a | 4452 | wait_for_completion(&cmd->t_transport_stop_comp); |
c66ac9db | 4453 | |
a1d8b49a AG |
4454 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
4455 | atomic_set(&cmd->t_transport_active, 0); | |
4456 | atomic_set(&cmd->t_transport_stop, 0); | |
c66ac9db | 4457 | |
6708bb27 | 4458 | pr_debug("wait_for_tasks: Stopped wait_for_compltion(" |
a1d8b49a | 4459 | "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n", |
e3d6f909 | 4460 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 4461 | |
d14921d6 | 4462 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db | 4463 | } |
d14921d6 | 4464 | EXPORT_SYMBOL(transport_wait_for_tasks); |
c66ac9db NB |
4465 | |
4466 | static int transport_get_sense_codes( | |
4467 | struct se_cmd *cmd, | |
4468 | u8 *asc, | |
4469 | u8 *ascq) | |
4470 | { | |
4471 | *asc = cmd->scsi_asc; | |
4472 | *ascq = cmd->scsi_ascq; | |
4473 | ||
4474 | return 0; | |
4475 | } | |
4476 | ||
4477 | static int transport_set_sense_codes( | |
4478 | struct se_cmd *cmd, | |
4479 | u8 asc, | |
4480 | u8 ascq) | |
4481 | { | |
4482 | cmd->scsi_asc = asc; | |
4483 | cmd->scsi_ascq = ascq; | |
4484 | ||
4485 | return 0; | |
4486 | } | |
4487 | ||
4488 | int transport_send_check_condition_and_sense( | |
4489 | struct se_cmd *cmd, | |
4490 | u8 reason, | |
4491 | int from_transport) | |
4492 | { | |
4493 | unsigned char *buffer = cmd->sense_buffer; | |
4494 | unsigned long flags; | |
4495 | int offset; | |
4496 | u8 asc = 0, ascq = 0; | |
4497 | ||
a1d8b49a | 4498 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
c66ac9db | 4499 | if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) { |
a1d8b49a | 4500 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
4501 | return 0; |
4502 | } | |
4503 | cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION; | |
a1d8b49a | 4504 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
c66ac9db NB |
4505 | |
4506 | if (!reason && from_transport) | |
4507 | goto after_reason; | |
4508 | ||
4509 | if (!from_transport) | |
4510 | cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE; | |
4511 | /* | |
4512 | * Data Segment and SenseLength of the fabric response PDU. | |
4513 | * | |
4514 | * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE | |
4515 | * from include/scsi/scsi_cmnd.h | |
4516 | */ | |
e3d6f909 | 4517 | offset = cmd->se_tfo->set_fabric_sense_len(cmd, |
c66ac9db NB |
4518 | TRANSPORT_SENSE_BUFFER); |
4519 | /* | |
4520 | * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses | |
4521 | * SENSE KEY values from include/scsi/scsi.h | |
4522 | */ | |
4523 | switch (reason) { | |
4524 | case TCM_NON_EXISTENT_LUN: | |
eb39d340 NB |
4525 | /* CURRENT ERROR */ |
4526 | buffer[offset] = 0x70; | |
4527 | /* ILLEGAL REQUEST */ | |
4528 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; | |
4529 | /* LOGICAL UNIT NOT SUPPORTED */ | |
4530 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25; | |
4531 | break; | |
c66ac9db NB |
4532 | case TCM_UNSUPPORTED_SCSI_OPCODE: |
4533 | case TCM_SECTOR_COUNT_TOO_MANY: | |
4534 | /* CURRENT ERROR */ | |
4535 | buffer[offset] = 0x70; | |
4536 | /* ILLEGAL REQUEST */ | |
4537 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; | |
4538 | /* INVALID COMMAND OPERATION CODE */ | |
4539 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20; | |
4540 | break; | |
4541 | case TCM_UNKNOWN_MODE_PAGE: | |
4542 | /* CURRENT ERROR */ | |
4543 | buffer[offset] = 0x70; | |
4544 | /* ILLEGAL REQUEST */ | |
4545 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; | |
4546 | /* INVALID FIELD IN CDB */ | |
4547 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24; | |
4548 | break; | |
4549 | case TCM_CHECK_CONDITION_ABORT_CMD: | |
4550 | /* CURRENT ERROR */ | |
4551 | buffer[offset] = 0x70; | |
4552 | /* ABORTED COMMAND */ | |
4553 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; | |
4554 | /* BUS DEVICE RESET FUNCTION OCCURRED */ | |
4555 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29; | |
4556 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03; | |
4557 | break; | |
4558 | case TCM_INCORRECT_AMOUNT_OF_DATA: | |
4559 | /* CURRENT ERROR */ | |
4560 | buffer[offset] = 0x70; | |
4561 | /* ABORTED COMMAND */ | |
4562 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; | |
4563 | /* WRITE ERROR */ | |
4564 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c; | |
4565 | /* NOT ENOUGH UNSOLICITED DATA */ | |
4566 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d; | |
4567 | break; | |
4568 | case TCM_INVALID_CDB_FIELD: | |
4569 | /* CURRENT ERROR */ | |
4570 | buffer[offset] = 0x70; | |
4571 | /* ABORTED COMMAND */ | |
4572 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; | |
4573 | /* INVALID FIELD IN CDB */ | |
4574 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24; | |
4575 | break; | |
4576 | case TCM_INVALID_PARAMETER_LIST: | |
4577 | /* CURRENT ERROR */ | |
4578 | buffer[offset] = 0x70; | |
4579 | /* ABORTED COMMAND */ | |
4580 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; | |
4581 | /* INVALID FIELD IN PARAMETER LIST */ | |
4582 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26; | |
4583 | break; | |
4584 | case TCM_UNEXPECTED_UNSOLICITED_DATA: | |
4585 | /* CURRENT ERROR */ | |
4586 | buffer[offset] = 0x70; | |
4587 | /* ABORTED COMMAND */ | |
4588 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; | |
4589 | /* WRITE ERROR */ | |
4590 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c; | |
4591 | /* UNEXPECTED_UNSOLICITED_DATA */ | |
4592 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c; | |
4593 | break; | |
4594 | case TCM_SERVICE_CRC_ERROR: | |
4595 | /* CURRENT ERROR */ | |
4596 | buffer[offset] = 0x70; | |
4597 | /* ABORTED COMMAND */ | |
4598 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; | |
4599 | /* PROTOCOL SERVICE CRC ERROR */ | |
4600 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47; | |
4601 | /* N/A */ | |
4602 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05; | |
4603 | break; | |
4604 | case TCM_SNACK_REJECTED: | |
4605 | /* CURRENT ERROR */ | |
4606 | buffer[offset] = 0x70; | |
4607 | /* ABORTED COMMAND */ | |
4608 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; | |
4609 | /* READ ERROR */ | |
4610 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11; | |
4611 | /* FAILED RETRANSMISSION REQUEST */ | |
4612 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13; | |
4613 | break; | |
4614 | case TCM_WRITE_PROTECTED: | |
4615 | /* CURRENT ERROR */ | |
4616 | buffer[offset] = 0x70; | |
4617 | /* DATA PROTECT */ | |
4618 | buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT; | |
4619 | /* WRITE PROTECTED */ | |
4620 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27; | |
4621 | break; | |
4622 | case TCM_CHECK_CONDITION_UNIT_ATTENTION: | |
4623 | /* CURRENT ERROR */ | |
4624 | buffer[offset] = 0x70; | |
4625 | /* UNIT ATTENTION */ | |
4626 | buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION; | |
4627 | core_scsi3_ua_for_check_condition(cmd, &asc, &ascq); | |
4628 | buffer[offset+SPC_ASC_KEY_OFFSET] = asc; | |
4629 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq; | |
4630 | break; | |
4631 | case TCM_CHECK_CONDITION_NOT_READY: | |
4632 | /* CURRENT ERROR */ | |
4633 | buffer[offset] = 0x70; | |
4634 | /* Not Ready */ | |
4635 | buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY; | |
4636 | transport_get_sense_codes(cmd, &asc, &ascq); | |
4637 | buffer[offset+SPC_ASC_KEY_OFFSET] = asc; | |
4638 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq; | |
4639 | break; | |
4640 | case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE: | |
4641 | default: | |
4642 | /* CURRENT ERROR */ | |
4643 | buffer[offset] = 0x70; | |
4644 | /* ILLEGAL REQUEST */ | |
4645 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; | |
4646 | /* LOGICAL UNIT COMMUNICATION FAILURE */ | |
4647 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80; | |
4648 | break; | |
4649 | } | |
4650 | /* | |
4651 | * This code uses linux/include/scsi/scsi.h SAM status codes! | |
4652 | */ | |
4653 | cmd->scsi_status = SAM_STAT_CHECK_CONDITION; | |
4654 | /* | |
4655 | * Automatically padded, this value is encoded in the fabric's | |
4656 | * data_length response PDU containing the SCSI defined sense data. | |
4657 | */ | |
4658 | cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset; | |
4659 | ||
4660 | after_reason: | |
07bde79a | 4661 | return cmd->se_tfo->queue_status(cmd); |
c66ac9db NB |
4662 | } |
4663 | EXPORT_SYMBOL(transport_send_check_condition_and_sense); | |
4664 | ||
4665 | int transport_check_aborted_status(struct se_cmd *cmd, int send_status) | |
4666 | { | |
4667 | int ret = 0; | |
4668 | ||
a1d8b49a | 4669 | if (atomic_read(&cmd->t_transport_aborted) != 0) { |
6708bb27 | 4670 | if (!send_status || |
c66ac9db NB |
4671 | (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS)) |
4672 | return 1; | |
4673 | #if 0 | |
6708bb27 | 4674 | pr_debug("Sending delayed SAM_STAT_TASK_ABORTED" |
c66ac9db | 4675 | " status for CDB: 0x%02x ITT: 0x%08x\n", |
a1d8b49a | 4676 | cmd->t_task_cdb[0], |
e3d6f909 | 4677 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db NB |
4678 | #endif |
4679 | cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS; | |
e3d6f909 | 4680 | cmd->se_tfo->queue_status(cmd); |
c66ac9db NB |
4681 | ret = 1; |
4682 | } | |
4683 | return ret; | |
4684 | } | |
4685 | EXPORT_SYMBOL(transport_check_aborted_status); | |
4686 | ||
4687 | void transport_send_task_abort(struct se_cmd *cmd) | |
4688 | { | |
c252f003 NB |
4689 | unsigned long flags; |
4690 | ||
4691 | spin_lock_irqsave(&cmd->t_state_lock, flags); | |
4692 | if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) { | |
4693 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
4694 | return; | |
4695 | } | |
4696 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); | |
4697 | ||
c66ac9db NB |
4698 | /* |
4699 | * If there are still expected incoming fabric WRITEs, we wait | |
4700 | * until until they have completed before sending a TASK_ABORTED | |
4701 | * response. This response with TASK_ABORTED status will be | |
4702 | * queued back to fabric module by transport_check_aborted_status(). | |
4703 | */ | |
4704 | if (cmd->data_direction == DMA_TO_DEVICE) { | |
e3d6f909 | 4705 | if (cmd->se_tfo->write_pending_status(cmd) != 0) { |
a1d8b49a | 4706 | atomic_inc(&cmd->t_transport_aborted); |
c66ac9db NB |
4707 | smp_mb__after_atomic_inc(); |
4708 | cmd->scsi_status = SAM_STAT_TASK_ABORTED; | |
4709 | transport_new_cmd_failure(cmd); | |
4710 | return; | |
4711 | } | |
4712 | } | |
4713 | cmd->scsi_status = SAM_STAT_TASK_ABORTED; | |
4714 | #if 0 | |
6708bb27 | 4715 | pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x," |
a1d8b49a | 4716 | " ITT: 0x%08x\n", cmd->t_task_cdb[0], |
e3d6f909 | 4717 | cmd->se_tfo->get_task_tag(cmd)); |
c66ac9db | 4718 | #endif |
e3d6f909 | 4719 | cmd->se_tfo->queue_status(cmd); |
c66ac9db NB |
4720 | } |
4721 | ||
4722 | /* transport_generic_do_tmr(): | |
4723 | * | |
4724 | * | |
4725 | */ | |
4726 | int transport_generic_do_tmr(struct se_cmd *cmd) | |
4727 | { | |
5951146d | 4728 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
4729 | struct se_tmr_req *tmr = cmd->se_tmr_req; |
4730 | int ret; | |
4731 | ||
4732 | switch (tmr->function) { | |
5c6cd613 | 4733 | case TMR_ABORT_TASK: |
c66ac9db NB |
4734 | tmr->response = TMR_FUNCTION_REJECTED; |
4735 | break; | |
5c6cd613 NB |
4736 | case TMR_ABORT_TASK_SET: |
4737 | case TMR_CLEAR_ACA: | |
4738 | case TMR_CLEAR_TASK_SET: | |
c66ac9db NB |
4739 | tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED; |
4740 | break; | |
5c6cd613 | 4741 | case TMR_LUN_RESET: |
c66ac9db NB |
4742 | ret = core_tmr_lun_reset(dev, tmr, NULL, NULL); |
4743 | tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE : | |
4744 | TMR_FUNCTION_REJECTED; | |
4745 | break; | |
5c6cd613 | 4746 | case TMR_TARGET_WARM_RESET: |
c66ac9db NB |
4747 | tmr->response = TMR_FUNCTION_REJECTED; |
4748 | break; | |
5c6cd613 | 4749 | case TMR_TARGET_COLD_RESET: |
c66ac9db NB |
4750 | tmr->response = TMR_FUNCTION_REJECTED; |
4751 | break; | |
c66ac9db | 4752 | default: |
6708bb27 | 4753 | pr_err("Uknown TMR function: 0x%02x.\n", |
c66ac9db NB |
4754 | tmr->function); |
4755 | tmr->response = TMR_FUNCTION_REJECTED; | |
4756 | break; | |
4757 | } | |
4758 | ||
4759 | cmd->t_state = TRANSPORT_ISTATE_PROCESSING; | |
e3d6f909 | 4760 | cmd->se_tfo->queue_tm_rsp(cmd); |
c66ac9db NB |
4761 | |
4762 | transport_cmd_check_stop(cmd, 2, 0); | |
4763 | return 0; | |
4764 | } | |
4765 | ||
c66ac9db NB |
4766 | /* transport_processing_thread(): |
4767 | * | |
4768 | * | |
4769 | */ | |
4770 | static int transport_processing_thread(void *param) | |
4771 | { | |
5951146d | 4772 | int ret; |
c66ac9db NB |
4773 | struct se_cmd *cmd; |
4774 | struct se_device *dev = (struct se_device *) param; | |
c66ac9db NB |
4775 | |
4776 | set_user_nice(current, -20); | |
4777 | ||
4778 | while (!kthread_should_stop()) { | |
e3d6f909 AG |
4779 | ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq, |
4780 | atomic_read(&dev->dev_queue_obj.queue_cnt) || | |
c66ac9db NB |
4781 | kthread_should_stop()); |
4782 | if (ret < 0) | |
4783 | goto out; | |
4784 | ||
c66ac9db NB |
4785 | get_cmd: |
4786 | __transport_execute_tasks(dev); | |
4787 | ||
5951146d AG |
4788 | cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj); |
4789 | if (!cmd) | |
c66ac9db NB |
4790 | continue; |
4791 | ||
5951146d | 4792 | switch (cmd->t_state) { |
680b73c5 CH |
4793 | case TRANSPORT_NEW_CMD: |
4794 | BUG(); | |
4795 | break; | |
c66ac9db | 4796 | case TRANSPORT_NEW_CMD_MAP: |
6708bb27 AG |
4797 | if (!cmd->se_tfo->new_cmd_map) { |
4798 | pr_err("cmd->se_tfo->new_cmd_map is" | |
c66ac9db NB |
4799 | " NULL for TRANSPORT_NEW_CMD_MAP\n"); |
4800 | BUG(); | |
4801 | } | |
e3d6f909 | 4802 | ret = cmd->se_tfo->new_cmd_map(cmd); |
c66ac9db NB |
4803 | if (ret < 0) { |
4804 | cmd->transport_error_status = ret; | |
4805 | transport_generic_request_failure(cmd, NULL, | |
4806 | 0, (cmd->data_direction != | |
4807 | DMA_TO_DEVICE)); | |
4808 | break; | |
4809 | } | |
c66ac9db | 4810 | ret = transport_generic_new_cmd(cmd); |
07bde79a NB |
4811 | if (ret == -EAGAIN) |
4812 | break; | |
4813 | else if (ret < 0) { | |
c66ac9db NB |
4814 | cmd->transport_error_status = ret; |
4815 | transport_generic_request_failure(cmd, NULL, | |
4816 | 0, (cmd->data_direction != | |
4817 | DMA_TO_DEVICE)); | |
4818 | } | |
4819 | break; | |
4820 | case TRANSPORT_PROCESS_WRITE: | |
4821 | transport_generic_process_write(cmd); | |
4822 | break; | |
4823 | case TRANSPORT_COMPLETE_OK: | |
4824 | transport_stop_all_task_timers(cmd); | |
4825 | transport_generic_complete_ok(cmd); | |
4826 | break; | |
4827 | case TRANSPORT_REMOVE: | |
e6a2573f | 4828 | transport_put_cmd(cmd); |
c66ac9db | 4829 | break; |
f4366772 | 4830 | case TRANSPORT_FREE_CMD_INTR: |
82f1c8a4 | 4831 | transport_generic_free_cmd(cmd, 0); |
f4366772 | 4832 | break; |
c66ac9db NB |
4833 | case TRANSPORT_PROCESS_TMR: |
4834 | transport_generic_do_tmr(cmd); | |
4835 | break; | |
4836 | case TRANSPORT_COMPLETE_FAILURE: | |
4837 | transport_generic_request_failure(cmd, NULL, 1, 1); | |
4838 | break; | |
4839 | case TRANSPORT_COMPLETE_TIMEOUT: | |
4840 | transport_stop_all_task_timers(cmd); | |
4841 | transport_generic_request_timeout(cmd); | |
4842 | break; | |
07bde79a | 4843 | case TRANSPORT_COMPLETE_QF_WP: |
e057f533 CH |
4844 | transport_write_pending_qf(cmd); |
4845 | break; | |
4846 | case TRANSPORT_COMPLETE_QF_OK: | |
4847 | transport_complete_qf(cmd); | |
07bde79a | 4848 | break; |
c66ac9db | 4849 | default: |
6708bb27 | 4850 | pr_err("Unknown t_state: %d deferred_t_state:" |
c66ac9db | 4851 | " %d for ITT: 0x%08x i_state: %d on SE LUN:" |
5951146d | 4852 | " %u\n", cmd->t_state, cmd->deferred_t_state, |
e3d6f909 AG |
4853 | cmd->se_tfo->get_task_tag(cmd), |
4854 | cmd->se_tfo->get_cmd_state(cmd), | |
4855 | cmd->se_lun->unpacked_lun); | |
c66ac9db NB |
4856 | BUG(); |
4857 | } | |
4858 | ||
4859 | goto get_cmd; | |
4860 | } | |
4861 | ||
4862 | out: | |
ce8762f6 NB |
4863 | WARN_ON(!list_empty(&dev->state_task_list)); |
4864 | WARN_ON(!list_empty(&dev->dev_queue_obj.qobj_list)); | |
c66ac9db NB |
4865 | dev->process_thread = NULL; |
4866 | return 0; | |
4867 | } |