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c66ac9db NB |
1 | /******************************************************************************* |
2 | * Filename: target_core_alua.c | |
3 | * | |
4 | * This file contains SPC-3 compliant asymmetric logical unit assigntment (ALUA) | |
5 | * | |
6 | * Copyright (c) 2009-2010 Rising Tide Systems | |
7 | * Copyright (c) 2009-2010 Linux-iSCSI.org | |
8 | * | |
9 | * Nicholas A. Bellinger <nab@kernel.org> | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License as published by | |
13 | * the Free Software Foundation; either version 2 of the License, or | |
14 | * (at your option) any later version. | |
15 | * | |
16 | * This program is distributed in the hope that it will be useful, | |
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | * GNU General Public License for more details. | |
20 | * | |
21 | * You should have received a copy of the GNU General Public License | |
22 | * along with this program; if not, write to the Free Software | |
23 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
24 | * | |
25 | ******************************************************************************/ | |
26 | ||
27 | #include <linux/version.h> | |
28 | #include <linux/slab.h> | |
29 | #include <linux/spinlock.h> | |
30 | #include <linux/configfs.h> | |
31 | #include <scsi/scsi.h> | |
32 | #include <scsi/scsi_cmnd.h> | |
33 | ||
34 | #include <target/target_core_base.h> | |
35 | #include <target/target_core_device.h> | |
36 | #include <target/target_core_transport.h> | |
37 | #include <target/target_core_fabric_ops.h> | |
38 | #include <target/target_core_configfs.h> | |
39 | ||
40 | #include "target_core_alua.h" | |
41 | #include "target_core_hba.h" | |
42 | #include "target_core_ua.h" | |
43 | ||
44 | static int core_alua_check_transition(int state, int *primary); | |
45 | static int core_alua_set_tg_pt_secondary_state( | |
46 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, | |
47 | struct se_port *port, int explict, int offline); | |
48 | ||
e3d6f909 AG |
49 | static u16 alua_lu_gps_counter; |
50 | static u32 alua_lu_gps_count; | |
51 | ||
52 | static DEFINE_SPINLOCK(lu_gps_lock); | |
53 | static LIST_HEAD(lu_gps_list); | |
54 | ||
55 | struct t10_alua_lu_gp *default_lu_gp; | |
56 | ||
c66ac9db NB |
57 | /* |
58 | * REPORT_TARGET_PORT_GROUPS | |
59 | * | |
60 | * See spc4r17 section 6.27 | |
61 | */ | |
62 | int core_emulate_report_target_port_groups(struct se_cmd *cmd) | |
63 | { | |
5951146d | 64 | struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev; |
c66ac9db NB |
65 | struct se_port *port; |
66 | struct t10_alua_tg_pt_gp *tg_pt_gp; | |
67 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; | |
05d1c7c0 | 68 | unsigned char *buf; |
c66ac9db NB |
69 | u32 rd_len = 0, off = 4; /* Skip over RESERVED area to first |
70 | Target port group descriptor */ | |
71 | ||
05d1c7c0 AG |
72 | buf = transport_kmap_first_data_page(cmd); |
73 | ||
e3d6f909 AG |
74 | spin_lock(&su_dev->t10_alua.tg_pt_gps_lock); |
75 | list_for_each_entry(tg_pt_gp, &su_dev->t10_alua.tg_pt_gps_list, | |
c66ac9db NB |
76 | tg_pt_gp_list) { |
77 | /* | |
78 | * PREF: Preferred target port bit, determine if this | |
79 | * bit should be set for port group. | |
80 | */ | |
81 | if (tg_pt_gp->tg_pt_gp_pref) | |
82 | buf[off] = 0x80; | |
83 | /* | |
84 | * Set the ASYMMETRIC ACCESS State | |
85 | */ | |
86 | buf[off++] |= (atomic_read( | |
87 | &tg_pt_gp->tg_pt_gp_alua_access_state) & 0xff); | |
88 | /* | |
89 | * Set supported ASYMMETRIC ACCESS State bits | |
90 | */ | |
91 | buf[off] = 0x80; /* T_SUP */ | |
92 | buf[off] |= 0x40; /* O_SUP */ | |
93 | buf[off] |= 0x8; /* U_SUP */ | |
94 | buf[off] |= 0x4; /* S_SUP */ | |
95 | buf[off] |= 0x2; /* AN_SUP */ | |
96 | buf[off++] |= 0x1; /* AO_SUP */ | |
97 | /* | |
98 | * TARGET PORT GROUP | |
99 | */ | |
100 | buf[off++] = ((tg_pt_gp->tg_pt_gp_id >> 8) & 0xff); | |
101 | buf[off++] = (tg_pt_gp->tg_pt_gp_id & 0xff); | |
102 | ||
103 | off++; /* Skip over Reserved */ | |
104 | /* | |
105 | * STATUS CODE | |
106 | */ | |
107 | buf[off++] = (tg_pt_gp->tg_pt_gp_alua_access_status & 0xff); | |
108 | /* | |
109 | * Vendor Specific field | |
110 | */ | |
111 | buf[off++] = 0x00; | |
112 | /* | |
113 | * TARGET PORT COUNT | |
114 | */ | |
115 | buf[off++] = (tg_pt_gp->tg_pt_gp_members & 0xff); | |
116 | rd_len += 8; | |
117 | ||
118 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); | |
119 | list_for_each_entry(tg_pt_gp_mem, &tg_pt_gp->tg_pt_gp_mem_list, | |
120 | tg_pt_gp_mem_list) { | |
121 | port = tg_pt_gp_mem->tg_pt; | |
122 | /* | |
123 | * Start Target Port descriptor format | |
124 | * | |
125 | * See spc4r17 section 6.2.7 Table 247 | |
126 | */ | |
127 | off += 2; /* Skip over Obsolete */ | |
128 | /* | |
129 | * Set RELATIVE TARGET PORT IDENTIFIER | |
130 | */ | |
131 | buf[off++] = ((port->sep_rtpi >> 8) & 0xff); | |
132 | buf[off++] = (port->sep_rtpi & 0xff); | |
133 | rd_len += 4; | |
134 | } | |
135 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); | |
136 | } | |
e3d6f909 | 137 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
138 | /* |
139 | * Set the RETURN DATA LENGTH set in the header of the DataIN Payload | |
140 | */ | |
141 | buf[0] = ((rd_len >> 24) & 0xff); | |
142 | buf[1] = ((rd_len >> 16) & 0xff); | |
143 | buf[2] = ((rd_len >> 8) & 0xff); | |
144 | buf[3] = (rd_len & 0xff); | |
145 | ||
05d1c7c0 AG |
146 | transport_kunmap_first_data_page(cmd); |
147 | ||
c66ac9db NB |
148 | return 0; |
149 | } | |
150 | ||
151 | /* | |
152 | * SET_TARGET_PORT_GROUPS for explict ALUA operation. | |
153 | * | |
154 | * See spc4r17 section 6.35 | |
155 | */ | |
156 | int core_emulate_set_target_port_groups(struct se_cmd *cmd) | |
157 | { | |
5951146d | 158 | struct se_device *dev = cmd->se_dev; |
e3d6f909 AG |
159 | struct se_subsystem_dev *su_dev = dev->se_sub_dev; |
160 | struct se_port *port, *l_port = cmd->se_lun->lun_sep; | |
161 | struct se_node_acl *nacl = cmd->se_sess->se_node_acl; | |
c66ac9db NB |
162 | struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *l_tg_pt_gp; |
163 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *l_tg_pt_gp_mem; | |
05d1c7c0 AG |
164 | unsigned char *buf; |
165 | unsigned char *ptr; | |
c66ac9db NB |
166 | u32 len = 4; /* Skip over RESERVED area in header */ |
167 | int alua_access_state, primary = 0, rc; | |
168 | u16 tg_pt_id, rtpi; | |
169 | ||
6708bb27 | 170 | if (!l_port) |
c66ac9db | 171 | return PYX_TRANSPORT_LU_COMM_FAILURE; |
05d1c7c0 AG |
172 | |
173 | buf = transport_kmap_first_data_page(cmd); | |
174 | ||
c66ac9db NB |
175 | /* |
176 | * Determine if explict ALUA via SET_TARGET_PORT_GROUPS is allowed | |
177 | * for the local tg_pt_gp. | |
178 | */ | |
179 | l_tg_pt_gp_mem = l_port->sep_alua_tg_pt_gp_mem; | |
6708bb27 AG |
180 | if (!l_tg_pt_gp_mem) { |
181 | pr_err("Unable to access l_port->sep_alua_tg_pt_gp_mem\n"); | |
05d1c7c0 AG |
182 | rc = PYX_TRANSPORT_UNKNOWN_SAM_OPCODE; |
183 | goto out; | |
c66ac9db NB |
184 | } |
185 | spin_lock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
186 | l_tg_pt_gp = l_tg_pt_gp_mem->tg_pt_gp; | |
6708bb27 | 187 | if (!l_tg_pt_gp) { |
c66ac9db | 188 | spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock); |
6708bb27 | 189 | pr_err("Unable to access *l_tg_pt_gp_mem->tg_pt_gp\n"); |
05d1c7c0 AG |
190 | rc = PYX_TRANSPORT_UNKNOWN_SAM_OPCODE; |
191 | goto out; | |
c66ac9db NB |
192 | } |
193 | rc = (l_tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA); | |
194 | spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
195 | ||
6708bb27 AG |
196 | if (!rc) { |
197 | pr_debug("Unable to process SET_TARGET_PORT_GROUPS" | |
c66ac9db | 198 | " while TPGS_EXPLICT_ALUA is disabled\n"); |
05d1c7c0 AG |
199 | rc = PYX_TRANSPORT_UNKNOWN_SAM_OPCODE; |
200 | goto out; | |
c66ac9db NB |
201 | } |
202 | ||
05d1c7c0 AG |
203 | ptr = &buf[4]; /* Skip over RESERVED area in header */ |
204 | ||
c66ac9db NB |
205 | while (len < cmd->data_length) { |
206 | alua_access_state = (ptr[0] & 0x0f); | |
207 | /* | |
208 | * Check the received ALUA access state, and determine if | |
209 | * the state is a primary or secondary target port asymmetric | |
210 | * access state. | |
211 | */ | |
212 | rc = core_alua_check_transition(alua_access_state, &primary); | |
213 | if (rc != 0) { | |
214 | /* | |
215 | * If the SET TARGET PORT GROUPS attempts to establish | |
216 | * an invalid combination of target port asymmetric | |
217 | * access states or attempts to establish an | |
218 | * unsupported target port asymmetric access state, | |
219 | * then the command shall be terminated with CHECK | |
220 | * CONDITION status, with the sense key set to ILLEGAL | |
221 | * REQUEST, and the additional sense code set to INVALID | |
222 | * FIELD IN PARAMETER LIST. | |
223 | */ | |
05d1c7c0 AG |
224 | rc = PYX_TRANSPORT_INVALID_PARAMETER_LIST; |
225 | goto out; | |
c66ac9db NB |
226 | } |
227 | rc = -1; | |
228 | /* | |
229 | * If the ASYMMETRIC ACCESS STATE field (see table 267) | |
230 | * specifies a primary target port asymmetric access state, | |
231 | * then the TARGET PORT GROUP OR TARGET PORT field specifies | |
232 | * a primary target port group for which the primary target | |
233 | * port asymmetric access state shall be changed. If the | |
234 | * ASYMMETRIC ACCESS STATE field specifies a secondary target | |
235 | * port asymmetric access state, then the TARGET PORT GROUP OR | |
236 | * TARGET PORT field specifies the relative target port | |
237 | * identifier (see 3.1.120) of the target port for which the | |
238 | * secondary target port asymmetric access state shall be | |
239 | * changed. | |
240 | */ | |
241 | if (primary) { | |
242 | tg_pt_id = ((ptr[2] << 8) & 0xff); | |
243 | tg_pt_id |= (ptr[3] & 0xff); | |
244 | /* | |
245 | * Locate the matching target port group ID from | |
246 | * the global tg_pt_gp list | |
247 | */ | |
e3d6f909 | 248 | spin_lock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db | 249 | list_for_each_entry(tg_pt_gp, |
e3d6f909 | 250 | &su_dev->t10_alua.tg_pt_gps_list, |
c66ac9db | 251 | tg_pt_gp_list) { |
6708bb27 | 252 | if (!tg_pt_gp->tg_pt_gp_valid_id) |
c66ac9db NB |
253 | continue; |
254 | ||
255 | if (tg_pt_id != tg_pt_gp->tg_pt_gp_id) | |
256 | continue; | |
257 | ||
258 | atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt); | |
259 | smp_mb__after_atomic_inc(); | |
e3d6f909 | 260 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
261 | |
262 | rc = core_alua_do_port_transition(tg_pt_gp, | |
263 | dev, l_port, nacl, | |
264 | alua_access_state, 1); | |
265 | ||
e3d6f909 | 266 | spin_lock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
267 | atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt); |
268 | smp_mb__after_atomic_dec(); | |
269 | break; | |
270 | } | |
e3d6f909 | 271 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
272 | /* |
273 | * If not matching target port group ID can be located | |
274 | * throw an exception with ASCQ: INVALID_PARAMETER_LIST | |
275 | */ | |
05d1c7c0 AG |
276 | if (rc != 0) { |
277 | rc = PYX_TRANSPORT_INVALID_PARAMETER_LIST; | |
278 | goto out; | |
279 | } | |
c66ac9db NB |
280 | } else { |
281 | /* | |
282 | * Extact the RELATIVE TARGET PORT IDENTIFIER to identify | |
283 | * the Target Port in question for the the incoming | |
284 | * SET_TARGET_PORT_GROUPS op. | |
285 | */ | |
286 | rtpi = ((ptr[2] << 8) & 0xff); | |
287 | rtpi |= (ptr[3] & 0xff); | |
288 | /* | |
289 | * Locate the matching relative target port identifer | |
290 | * for the struct se_device storage object. | |
291 | */ | |
292 | spin_lock(&dev->se_port_lock); | |
293 | list_for_each_entry(port, &dev->dev_sep_list, | |
294 | sep_list) { | |
295 | if (port->sep_rtpi != rtpi) | |
296 | continue; | |
297 | ||
298 | tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; | |
299 | spin_unlock(&dev->se_port_lock); | |
300 | ||
301 | rc = core_alua_set_tg_pt_secondary_state( | |
302 | tg_pt_gp_mem, port, 1, 1); | |
303 | ||
304 | spin_lock(&dev->se_port_lock); | |
305 | break; | |
306 | } | |
307 | spin_unlock(&dev->se_port_lock); | |
308 | /* | |
309 | * If not matching relative target port identifier can | |
310 | * be located, throw an exception with ASCQ: | |
311 | * INVALID_PARAMETER_LIST | |
312 | */ | |
05d1c7c0 AG |
313 | if (rc != 0) { |
314 | rc = PYX_TRANSPORT_INVALID_PARAMETER_LIST; | |
315 | goto out; | |
316 | } | |
c66ac9db NB |
317 | } |
318 | ||
319 | ptr += 4; | |
320 | len += 4; | |
321 | } | |
322 | ||
05d1c7c0 AG |
323 | out: |
324 | transport_kunmap_first_data_page(cmd); | |
325 | ||
c66ac9db NB |
326 | return 0; |
327 | } | |
328 | ||
329 | static inline int core_alua_state_nonoptimized( | |
330 | struct se_cmd *cmd, | |
331 | unsigned char *cdb, | |
332 | int nonop_delay_msecs, | |
333 | u8 *alua_ascq) | |
334 | { | |
335 | /* | |
336 | * Set SCF_ALUA_NON_OPTIMIZED here, this value will be checked | |
337 | * later to determine if processing of this cmd needs to be | |
338 | * temporarily delayed for the Active/NonOptimized primary access state. | |
339 | */ | |
340 | cmd->se_cmd_flags |= SCF_ALUA_NON_OPTIMIZED; | |
341 | cmd->alua_nonop_delay = nonop_delay_msecs; | |
342 | return 0; | |
343 | } | |
344 | ||
345 | static inline int core_alua_state_standby( | |
346 | struct se_cmd *cmd, | |
347 | unsigned char *cdb, | |
348 | u8 *alua_ascq) | |
349 | { | |
350 | /* | |
351 | * Allowed CDBs for ALUA_ACCESS_STATE_STANDBY as defined by | |
352 | * spc4r17 section 5.9.2.4.4 | |
353 | */ | |
354 | switch (cdb[0]) { | |
355 | case INQUIRY: | |
356 | case LOG_SELECT: | |
357 | case LOG_SENSE: | |
358 | case MODE_SELECT: | |
359 | case MODE_SENSE: | |
360 | case REPORT_LUNS: | |
361 | case RECEIVE_DIAGNOSTIC: | |
362 | case SEND_DIAGNOSTIC: | |
363 | case MAINTENANCE_IN: | |
364 | switch (cdb[1]) { | |
365 | case MI_REPORT_TARGET_PGS: | |
366 | return 0; | |
367 | default: | |
368 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY; | |
369 | return 1; | |
370 | } | |
371 | case MAINTENANCE_OUT: | |
372 | switch (cdb[1]) { | |
373 | case MO_SET_TARGET_PGS: | |
374 | return 0; | |
375 | default: | |
376 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY; | |
377 | return 1; | |
378 | } | |
379 | case REQUEST_SENSE: | |
380 | case PERSISTENT_RESERVE_IN: | |
381 | case PERSISTENT_RESERVE_OUT: | |
382 | case READ_BUFFER: | |
383 | case WRITE_BUFFER: | |
384 | return 0; | |
385 | default: | |
386 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY; | |
387 | return 1; | |
388 | } | |
389 | ||
390 | return 0; | |
391 | } | |
392 | ||
393 | static inline int core_alua_state_unavailable( | |
394 | struct se_cmd *cmd, | |
395 | unsigned char *cdb, | |
396 | u8 *alua_ascq) | |
397 | { | |
398 | /* | |
399 | * Allowed CDBs for ALUA_ACCESS_STATE_UNAVAILABLE as defined by | |
400 | * spc4r17 section 5.9.2.4.5 | |
401 | */ | |
402 | switch (cdb[0]) { | |
403 | case INQUIRY: | |
404 | case REPORT_LUNS: | |
405 | case MAINTENANCE_IN: | |
406 | switch (cdb[1]) { | |
407 | case MI_REPORT_TARGET_PGS: | |
408 | return 0; | |
409 | default: | |
410 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE; | |
411 | return 1; | |
412 | } | |
413 | case MAINTENANCE_OUT: | |
414 | switch (cdb[1]) { | |
415 | case MO_SET_TARGET_PGS: | |
416 | return 0; | |
417 | default: | |
418 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE; | |
419 | return 1; | |
420 | } | |
421 | case REQUEST_SENSE: | |
422 | case READ_BUFFER: | |
423 | case WRITE_BUFFER: | |
424 | return 0; | |
425 | default: | |
426 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE; | |
427 | return 1; | |
428 | } | |
429 | ||
430 | return 0; | |
431 | } | |
432 | ||
433 | static inline int core_alua_state_transition( | |
434 | struct se_cmd *cmd, | |
435 | unsigned char *cdb, | |
436 | u8 *alua_ascq) | |
437 | { | |
438 | /* | |
439 | * Allowed CDBs for ALUA_ACCESS_STATE_TRANSITIO as defined by | |
440 | * spc4r17 section 5.9.2.5 | |
441 | */ | |
442 | switch (cdb[0]) { | |
443 | case INQUIRY: | |
444 | case REPORT_LUNS: | |
445 | case MAINTENANCE_IN: | |
446 | switch (cdb[1]) { | |
447 | case MI_REPORT_TARGET_PGS: | |
448 | return 0; | |
449 | default: | |
450 | *alua_ascq = ASCQ_04H_ALUA_STATE_TRANSITION; | |
451 | return 1; | |
452 | } | |
453 | case REQUEST_SENSE: | |
454 | case READ_BUFFER: | |
455 | case WRITE_BUFFER: | |
456 | return 0; | |
457 | default: | |
458 | *alua_ascq = ASCQ_04H_ALUA_STATE_TRANSITION; | |
459 | return 1; | |
460 | } | |
461 | ||
462 | return 0; | |
463 | } | |
464 | ||
465 | /* | |
466 | * Used for alua_type SPC_ALUA_PASSTHROUGH and SPC2_ALUA_DISABLED | |
467 | * in transport_cmd_sequencer(). This function is assigned to | |
468 | * struct t10_alua *->state_check() in core_setup_alua() | |
469 | */ | |
470 | static int core_alua_state_check_nop( | |
471 | struct se_cmd *cmd, | |
472 | unsigned char *cdb, | |
473 | u8 *alua_ascq) | |
474 | { | |
475 | return 0; | |
476 | } | |
477 | ||
478 | /* | |
479 | * Used for alua_type SPC3_ALUA_EMULATED in transport_cmd_sequencer(). | |
480 | * This function is assigned to struct t10_alua *->state_check() in | |
481 | * core_setup_alua() | |
482 | * | |
483 | * Also, this function can return three different return codes to | |
484 | * signal transport_generic_cmd_sequencer() | |
485 | * | |
486 | * return 1: Is used to signal LUN not accecsable, and check condition/not ready | |
487 | * return 0: Used to signal success | |
488 | * reutrn -1: Used to signal failure, and invalid cdb field | |
489 | */ | |
490 | static int core_alua_state_check( | |
491 | struct se_cmd *cmd, | |
492 | unsigned char *cdb, | |
493 | u8 *alua_ascq) | |
494 | { | |
e3d6f909 | 495 | struct se_lun *lun = cmd->se_lun; |
c66ac9db NB |
496 | struct se_port *port = lun->lun_sep; |
497 | struct t10_alua_tg_pt_gp *tg_pt_gp; | |
498 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; | |
499 | int out_alua_state, nonop_delay_msecs; | |
500 | ||
6708bb27 | 501 | if (!port) |
c66ac9db NB |
502 | return 0; |
503 | /* | |
504 | * First, check for a struct se_port specific secondary ALUA target port | |
505 | * access state: OFFLINE | |
506 | */ | |
507 | if (atomic_read(&port->sep_tg_pt_secondary_offline)) { | |
508 | *alua_ascq = ASCQ_04H_ALUA_OFFLINE; | |
6708bb27 | 509 | pr_debug("ALUA: Got secondary offline status for local" |
c66ac9db NB |
510 | " target port\n"); |
511 | *alua_ascq = ASCQ_04H_ALUA_OFFLINE; | |
512 | return 1; | |
513 | } | |
514 | /* | |
515 | * Second, obtain the struct t10_alua_tg_pt_gp_member pointer to the | |
516 | * ALUA target port group, to obtain current ALUA access state. | |
517 | * Otherwise look for the underlying struct se_device association with | |
518 | * a ALUA logical unit group. | |
519 | */ | |
520 | tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; | |
521 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
522 | tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; | |
523 | out_alua_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state); | |
524 | nonop_delay_msecs = tg_pt_gp->tg_pt_gp_nonop_delay_msecs; | |
525 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
526 | /* | |
25985edc LDM |
527 | * Process ALUA_ACCESS_STATE_ACTIVE_OPTMIZED in a separate conditional |
528 | * statement so the compiler knows explicitly to check this case first. | |
c66ac9db NB |
529 | * For the Optimized ALUA access state case, we want to process the |
530 | * incoming fabric cmd ASAP.. | |
531 | */ | |
532 | if (out_alua_state == ALUA_ACCESS_STATE_ACTIVE_OPTMIZED) | |
533 | return 0; | |
534 | ||
535 | switch (out_alua_state) { | |
536 | case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED: | |
537 | return core_alua_state_nonoptimized(cmd, cdb, | |
538 | nonop_delay_msecs, alua_ascq); | |
539 | case ALUA_ACCESS_STATE_STANDBY: | |
540 | return core_alua_state_standby(cmd, cdb, alua_ascq); | |
541 | case ALUA_ACCESS_STATE_UNAVAILABLE: | |
542 | return core_alua_state_unavailable(cmd, cdb, alua_ascq); | |
543 | case ALUA_ACCESS_STATE_TRANSITION: | |
544 | return core_alua_state_transition(cmd, cdb, alua_ascq); | |
545 | /* | |
546 | * OFFLINE is a secondary ALUA target port group access state, that is | |
547 | * handled above with struct se_port->sep_tg_pt_secondary_offline=1 | |
548 | */ | |
549 | case ALUA_ACCESS_STATE_OFFLINE: | |
550 | default: | |
6708bb27 | 551 | pr_err("Unknown ALUA access state: 0x%02x\n", |
c66ac9db | 552 | out_alua_state); |
e3d6f909 | 553 | return -EINVAL; |
c66ac9db NB |
554 | } |
555 | ||
556 | return 0; | |
557 | } | |
558 | ||
559 | /* | |
560 | * Check implict and explict ALUA state change request. | |
561 | */ | |
562 | static int core_alua_check_transition(int state, int *primary) | |
563 | { | |
564 | switch (state) { | |
565 | case ALUA_ACCESS_STATE_ACTIVE_OPTMIZED: | |
566 | case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED: | |
567 | case ALUA_ACCESS_STATE_STANDBY: | |
568 | case ALUA_ACCESS_STATE_UNAVAILABLE: | |
569 | /* | |
570 | * OPTIMIZED, NON-OPTIMIZED, STANDBY and UNAVAILABLE are | |
571 | * defined as primary target port asymmetric access states. | |
572 | */ | |
573 | *primary = 1; | |
574 | break; | |
575 | case ALUA_ACCESS_STATE_OFFLINE: | |
576 | /* | |
577 | * OFFLINE state is defined as a secondary target port | |
578 | * asymmetric access state. | |
579 | */ | |
580 | *primary = 0; | |
581 | break; | |
582 | default: | |
6708bb27 | 583 | pr_err("Unknown ALUA access state: 0x%02x\n", state); |
e3d6f909 | 584 | return -EINVAL; |
c66ac9db NB |
585 | } |
586 | ||
587 | return 0; | |
588 | } | |
589 | ||
590 | static char *core_alua_dump_state(int state) | |
591 | { | |
592 | switch (state) { | |
593 | case ALUA_ACCESS_STATE_ACTIVE_OPTMIZED: | |
594 | return "Active/Optimized"; | |
595 | case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED: | |
596 | return "Active/NonOptimized"; | |
597 | case ALUA_ACCESS_STATE_STANDBY: | |
598 | return "Standby"; | |
599 | case ALUA_ACCESS_STATE_UNAVAILABLE: | |
600 | return "Unavailable"; | |
601 | case ALUA_ACCESS_STATE_OFFLINE: | |
602 | return "Offline"; | |
603 | default: | |
604 | return "Unknown"; | |
605 | } | |
606 | ||
607 | return NULL; | |
608 | } | |
609 | ||
610 | char *core_alua_dump_status(int status) | |
611 | { | |
612 | switch (status) { | |
613 | case ALUA_STATUS_NONE: | |
614 | return "None"; | |
615 | case ALUA_STATUS_ALTERED_BY_EXPLICT_STPG: | |
616 | return "Altered by Explict STPG"; | |
617 | case ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA: | |
618 | return "Altered by Implict ALUA"; | |
619 | default: | |
620 | return "Unknown"; | |
621 | } | |
622 | ||
623 | return NULL; | |
624 | } | |
625 | ||
626 | /* | |
627 | * Used by fabric modules to determine when we need to delay processing | |
628 | * for the Active/NonOptimized paths.. | |
629 | */ | |
630 | int core_alua_check_nonop_delay( | |
631 | struct se_cmd *cmd) | |
632 | { | |
633 | if (!(cmd->se_cmd_flags & SCF_ALUA_NON_OPTIMIZED)) | |
634 | return 0; | |
635 | if (in_interrupt()) | |
636 | return 0; | |
637 | /* | |
638 | * The ALUA Active/NonOptimized access state delay can be disabled | |
639 | * in via configfs with a value of zero | |
640 | */ | |
6708bb27 | 641 | if (!cmd->alua_nonop_delay) |
c66ac9db NB |
642 | return 0; |
643 | /* | |
644 | * struct se_cmd->alua_nonop_delay gets set by a target port group | |
645 | * defined interval in core_alua_state_nonoptimized() | |
646 | */ | |
647 | msleep_interruptible(cmd->alua_nonop_delay); | |
648 | return 0; | |
649 | } | |
650 | EXPORT_SYMBOL(core_alua_check_nonop_delay); | |
651 | ||
652 | /* | |
653 | * Called with tg_pt_gp->tg_pt_gp_md_mutex or tg_pt_gp_mem->sep_tg_pt_md_mutex | |
654 | * | |
655 | */ | |
656 | static int core_alua_write_tpg_metadata( | |
657 | const char *path, | |
658 | unsigned char *md_buf, | |
659 | u32 md_buf_len) | |
660 | { | |
661 | mm_segment_t old_fs; | |
662 | struct file *file; | |
663 | struct iovec iov[1]; | |
664 | int flags = O_RDWR | O_CREAT | O_TRUNC, ret; | |
665 | ||
666 | memset(iov, 0, sizeof(struct iovec)); | |
667 | ||
668 | file = filp_open(path, flags, 0600); | |
669 | if (IS_ERR(file) || !file || !file->f_dentry) { | |
6708bb27 | 670 | pr_err("filp_open(%s) for ALUA metadata failed\n", |
c66ac9db NB |
671 | path); |
672 | return -ENODEV; | |
673 | } | |
674 | ||
675 | iov[0].iov_base = &md_buf[0]; | |
676 | iov[0].iov_len = md_buf_len; | |
677 | ||
678 | old_fs = get_fs(); | |
679 | set_fs(get_ds()); | |
680 | ret = vfs_writev(file, &iov[0], 1, &file->f_pos); | |
681 | set_fs(old_fs); | |
682 | ||
683 | if (ret < 0) { | |
6708bb27 | 684 | pr_err("Error writing ALUA metadata file: %s\n", path); |
c66ac9db NB |
685 | filp_close(file, NULL); |
686 | return -EIO; | |
687 | } | |
688 | filp_close(file, NULL); | |
689 | ||
690 | return 0; | |
691 | } | |
692 | ||
693 | /* | |
694 | * Called with tg_pt_gp->tg_pt_gp_md_mutex held | |
695 | */ | |
696 | static int core_alua_update_tpg_primary_metadata( | |
697 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
698 | int primary_state, | |
699 | unsigned char *md_buf) | |
700 | { | |
701 | struct se_subsystem_dev *su_dev = tg_pt_gp->tg_pt_gp_su_dev; | |
702 | struct t10_wwn *wwn = &su_dev->t10_wwn; | |
703 | char path[ALUA_METADATA_PATH_LEN]; | |
704 | int len; | |
705 | ||
706 | memset(path, 0, ALUA_METADATA_PATH_LEN); | |
707 | ||
708 | len = snprintf(md_buf, tg_pt_gp->tg_pt_gp_md_buf_len, | |
709 | "tg_pt_gp_id=%hu\n" | |
710 | "alua_access_state=0x%02x\n" | |
711 | "alua_access_status=0x%02x\n", | |
712 | tg_pt_gp->tg_pt_gp_id, primary_state, | |
713 | tg_pt_gp->tg_pt_gp_alua_access_status); | |
714 | ||
715 | snprintf(path, ALUA_METADATA_PATH_LEN, | |
716 | "/var/target/alua/tpgs_%s/%s", &wwn->unit_serial[0], | |
717 | config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item)); | |
718 | ||
719 | return core_alua_write_tpg_metadata(path, md_buf, len); | |
720 | } | |
721 | ||
722 | static int core_alua_do_transition_tg_pt( | |
723 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
724 | struct se_port *l_port, | |
725 | struct se_node_acl *nacl, | |
726 | unsigned char *md_buf, | |
727 | int new_state, | |
728 | int explict) | |
729 | { | |
730 | struct se_dev_entry *se_deve; | |
731 | struct se_lun_acl *lacl; | |
732 | struct se_port *port; | |
733 | struct t10_alua_tg_pt_gp_member *mem; | |
734 | int old_state = 0; | |
735 | /* | |
736 | * Save the old primary ALUA access state, and set the current state | |
737 | * to ALUA_ACCESS_STATE_TRANSITION. | |
738 | */ | |
739 | old_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state); | |
740 | atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, | |
741 | ALUA_ACCESS_STATE_TRANSITION); | |
742 | tg_pt_gp->tg_pt_gp_alua_access_status = (explict) ? | |
743 | ALUA_STATUS_ALTERED_BY_EXPLICT_STPG : | |
744 | ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA; | |
745 | /* | |
746 | * Check for the optional ALUA primary state transition delay | |
747 | */ | |
748 | if (tg_pt_gp->tg_pt_gp_trans_delay_msecs != 0) | |
749 | msleep_interruptible(tg_pt_gp->tg_pt_gp_trans_delay_msecs); | |
750 | ||
751 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); | |
752 | list_for_each_entry(mem, &tg_pt_gp->tg_pt_gp_mem_list, | |
753 | tg_pt_gp_mem_list) { | |
754 | port = mem->tg_pt; | |
755 | /* | |
756 | * After an implicit target port asymmetric access state | |
757 | * change, a device server shall establish a unit attention | |
758 | * condition for the initiator port associated with every I_T | |
759 | * nexus with the additional sense code set to ASYMMETRIC | |
760 | * ACCESS STATE CHAGED. | |
761 | * | |
762 | * After an explicit target port asymmetric access state | |
763 | * change, a device server shall establish a unit attention | |
764 | * condition with the additional sense code set to ASYMMETRIC | |
765 | * ACCESS STATE CHANGED for the initiator port associated with | |
766 | * every I_T nexus other than the I_T nexus on which the SET | |
767 | * TARGET PORT GROUPS command | |
768 | */ | |
769 | atomic_inc(&mem->tg_pt_gp_mem_ref_cnt); | |
770 | smp_mb__after_atomic_inc(); | |
771 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); | |
772 | ||
773 | spin_lock_bh(&port->sep_alua_lock); | |
774 | list_for_each_entry(se_deve, &port->sep_alua_list, | |
775 | alua_port_list) { | |
776 | lacl = se_deve->se_lun_acl; | |
777 | /* | |
778 | * se_deve->se_lun_acl pointer may be NULL for a | |
779 | * entry created without explict Node+MappedLUN ACLs | |
780 | */ | |
6708bb27 | 781 | if (!lacl) |
c66ac9db NB |
782 | continue; |
783 | ||
784 | if (explict && | |
785 | (nacl != NULL) && (nacl == lacl->se_lun_nacl) && | |
786 | (l_port != NULL) && (l_port == port)) | |
787 | continue; | |
788 | ||
789 | core_scsi3_ua_allocate(lacl->se_lun_nacl, | |
790 | se_deve->mapped_lun, 0x2A, | |
791 | ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED); | |
792 | } | |
793 | spin_unlock_bh(&port->sep_alua_lock); | |
794 | ||
795 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); | |
796 | atomic_dec(&mem->tg_pt_gp_mem_ref_cnt); | |
797 | smp_mb__after_atomic_dec(); | |
798 | } | |
799 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); | |
800 | /* | |
801 | * Update the ALUA metadata buf that has been allocated in | |
802 | * core_alua_do_port_transition(), this metadata will be written | |
803 | * to struct file. | |
804 | * | |
805 | * Note that there is the case where we do not want to update the | |
806 | * metadata when the saved metadata is being parsed in userspace | |
807 | * when setting the existing port access state and access status. | |
808 | * | |
809 | * Also note that the failure to write out the ALUA metadata to | |
810 | * struct file does NOT affect the actual ALUA transition. | |
811 | */ | |
812 | if (tg_pt_gp->tg_pt_gp_write_metadata) { | |
813 | mutex_lock(&tg_pt_gp->tg_pt_gp_md_mutex); | |
814 | core_alua_update_tpg_primary_metadata(tg_pt_gp, | |
815 | new_state, md_buf); | |
816 | mutex_unlock(&tg_pt_gp->tg_pt_gp_md_mutex); | |
817 | } | |
818 | /* | |
819 | * Set the current primary ALUA access state to the requested new state | |
820 | */ | |
821 | atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, new_state); | |
822 | ||
6708bb27 | 823 | pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu" |
c66ac9db NB |
824 | " from primary access state %s to %s\n", (explict) ? "explict" : |
825 | "implict", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item), | |
826 | tg_pt_gp->tg_pt_gp_id, core_alua_dump_state(old_state), | |
827 | core_alua_dump_state(new_state)); | |
828 | ||
829 | return 0; | |
830 | } | |
831 | ||
832 | int core_alua_do_port_transition( | |
833 | struct t10_alua_tg_pt_gp *l_tg_pt_gp, | |
834 | struct se_device *l_dev, | |
835 | struct se_port *l_port, | |
836 | struct se_node_acl *l_nacl, | |
837 | int new_state, | |
838 | int explict) | |
839 | { | |
840 | struct se_device *dev; | |
841 | struct se_port *port; | |
842 | struct se_subsystem_dev *su_dev; | |
843 | struct se_node_acl *nacl; | |
844 | struct t10_alua_lu_gp *lu_gp; | |
845 | struct t10_alua_lu_gp_member *lu_gp_mem, *local_lu_gp_mem; | |
846 | struct t10_alua_tg_pt_gp *tg_pt_gp; | |
847 | unsigned char *md_buf; | |
848 | int primary; | |
849 | ||
850 | if (core_alua_check_transition(new_state, &primary) != 0) | |
851 | return -EINVAL; | |
852 | ||
853 | md_buf = kzalloc(l_tg_pt_gp->tg_pt_gp_md_buf_len, GFP_KERNEL); | |
6708bb27 AG |
854 | if (!md_buf) { |
855 | pr_err("Unable to allocate buf for ALUA metadata\n"); | |
c66ac9db NB |
856 | return -ENOMEM; |
857 | } | |
858 | ||
859 | local_lu_gp_mem = l_dev->dev_alua_lu_gp_mem; | |
860 | spin_lock(&local_lu_gp_mem->lu_gp_mem_lock); | |
861 | lu_gp = local_lu_gp_mem->lu_gp; | |
862 | atomic_inc(&lu_gp->lu_gp_ref_cnt); | |
863 | smp_mb__after_atomic_inc(); | |
864 | spin_unlock(&local_lu_gp_mem->lu_gp_mem_lock); | |
865 | /* | |
866 | * For storage objects that are members of the 'default_lu_gp', | |
867 | * we only do transition on the passed *l_tp_pt_gp, and not | |
868 | * on all of the matching target port groups IDs in default_lu_gp. | |
869 | */ | |
6708bb27 | 870 | if (!lu_gp->lu_gp_id) { |
c66ac9db NB |
871 | /* |
872 | * core_alua_do_transition_tg_pt() will always return | |
873 | * success. | |
874 | */ | |
875 | core_alua_do_transition_tg_pt(l_tg_pt_gp, l_port, l_nacl, | |
876 | md_buf, new_state, explict); | |
877 | atomic_dec(&lu_gp->lu_gp_ref_cnt); | |
878 | smp_mb__after_atomic_dec(); | |
879 | kfree(md_buf); | |
880 | return 0; | |
881 | } | |
882 | /* | |
883 | * For all other LU groups aside from 'default_lu_gp', walk all of | |
884 | * the associated storage objects looking for a matching target port | |
885 | * group ID from the local target port group. | |
886 | */ | |
887 | spin_lock(&lu_gp->lu_gp_lock); | |
888 | list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list, | |
889 | lu_gp_mem_list) { | |
890 | ||
891 | dev = lu_gp_mem->lu_gp_mem_dev; | |
892 | su_dev = dev->se_sub_dev; | |
893 | atomic_inc(&lu_gp_mem->lu_gp_mem_ref_cnt); | |
894 | smp_mb__after_atomic_inc(); | |
895 | spin_unlock(&lu_gp->lu_gp_lock); | |
896 | ||
e3d6f909 | 897 | spin_lock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db | 898 | list_for_each_entry(tg_pt_gp, |
e3d6f909 | 899 | &su_dev->t10_alua.tg_pt_gps_list, |
c66ac9db NB |
900 | tg_pt_gp_list) { |
901 | ||
6708bb27 | 902 | if (!tg_pt_gp->tg_pt_gp_valid_id) |
c66ac9db NB |
903 | continue; |
904 | /* | |
905 | * If the target behavior port asymmetric access state | |
906 | * is changed for any target port group accessiable via | |
907 | * a logical unit within a LU group, the target port | |
908 | * behavior group asymmetric access states for the same | |
909 | * target port group accessible via other logical units | |
910 | * in that LU group will also change. | |
911 | */ | |
912 | if (l_tg_pt_gp->tg_pt_gp_id != tg_pt_gp->tg_pt_gp_id) | |
913 | continue; | |
914 | ||
915 | if (l_tg_pt_gp == tg_pt_gp) { | |
916 | port = l_port; | |
917 | nacl = l_nacl; | |
918 | } else { | |
919 | port = NULL; | |
920 | nacl = NULL; | |
921 | } | |
922 | atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt); | |
923 | smp_mb__after_atomic_inc(); | |
e3d6f909 | 924 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
925 | /* |
926 | * core_alua_do_transition_tg_pt() will always return | |
927 | * success. | |
928 | */ | |
929 | core_alua_do_transition_tg_pt(tg_pt_gp, port, | |
930 | nacl, md_buf, new_state, explict); | |
931 | ||
e3d6f909 | 932 | spin_lock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
933 | atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt); |
934 | smp_mb__after_atomic_dec(); | |
935 | } | |
e3d6f909 | 936 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
937 | |
938 | spin_lock(&lu_gp->lu_gp_lock); | |
939 | atomic_dec(&lu_gp_mem->lu_gp_mem_ref_cnt); | |
940 | smp_mb__after_atomic_dec(); | |
941 | } | |
942 | spin_unlock(&lu_gp->lu_gp_lock); | |
943 | ||
6708bb27 | 944 | pr_debug("Successfully processed LU Group: %s all ALUA TG PT" |
c66ac9db NB |
945 | " Group IDs: %hu %s transition to primary state: %s\n", |
946 | config_item_name(&lu_gp->lu_gp_group.cg_item), | |
947 | l_tg_pt_gp->tg_pt_gp_id, (explict) ? "explict" : "implict", | |
948 | core_alua_dump_state(new_state)); | |
949 | ||
950 | atomic_dec(&lu_gp->lu_gp_ref_cnt); | |
951 | smp_mb__after_atomic_dec(); | |
952 | kfree(md_buf); | |
953 | return 0; | |
954 | } | |
955 | ||
956 | /* | |
957 | * Called with tg_pt_gp_mem->sep_tg_pt_md_mutex held | |
958 | */ | |
959 | static int core_alua_update_tpg_secondary_metadata( | |
960 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, | |
961 | struct se_port *port, | |
962 | unsigned char *md_buf, | |
963 | u32 md_buf_len) | |
964 | { | |
965 | struct se_portal_group *se_tpg = port->sep_tpg; | |
966 | char path[ALUA_METADATA_PATH_LEN], wwn[ALUA_SECONDARY_METADATA_WWN_LEN]; | |
967 | int len; | |
968 | ||
969 | memset(path, 0, ALUA_METADATA_PATH_LEN); | |
970 | memset(wwn, 0, ALUA_SECONDARY_METADATA_WWN_LEN); | |
971 | ||
972 | len = snprintf(wwn, ALUA_SECONDARY_METADATA_WWN_LEN, "%s", | |
e3d6f909 | 973 | se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg)); |
c66ac9db | 974 | |
e3d6f909 | 975 | if (se_tpg->se_tpg_tfo->tpg_get_tag != NULL) |
c66ac9db | 976 | snprintf(wwn+len, ALUA_SECONDARY_METADATA_WWN_LEN-len, "+%hu", |
e3d6f909 | 977 | se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg)); |
c66ac9db NB |
978 | |
979 | len = snprintf(md_buf, md_buf_len, "alua_tg_pt_offline=%d\n" | |
980 | "alua_tg_pt_status=0x%02x\n", | |
981 | atomic_read(&port->sep_tg_pt_secondary_offline), | |
982 | port->sep_tg_pt_secondary_stat); | |
983 | ||
984 | snprintf(path, ALUA_METADATA_PATH_LEN, "/var/target/alua/%s/%s/lun_%u", | |
e3d6f909 | 985 | se_tpg->se_tpg_tfo->get_fabric_name(), wwn, |
c66ac9db NB |
986 | port->sep_lun->unpacked_lun); |
987 | ||
988 | return core_alua_write_tpg_metadata(path, md_buf, len); | |
989 | } | |
990 | ||
991 | static int core_alua_set_tg_pt_secondary_state( | |
992 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, | |
993 | struct se_port *port, | |
994 | int explict, | |
995 | int offline) | |
996 | { | |
997 | struct t10_alua_tg_pt_gp *tg_pt_gp; | |
998 | unsigned char *md_buf; | |
999 | u32 md_buf_len; | |
1000 | int trans_delay_msecs; | |
1001 | ||
1002 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1003 | tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; | |
6708bb27 | 1004 | if (!tg_pt_gp) { |
c66ac9db | 1005 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
6708bb27 | 1006 | pr_err("Unable to complete secondary state" |
c66ac9db | 1007 | " transition\n"); |
e3d6f909 | 1008 | return -EINVAL; |
c66ac9db NB |
1009 | } |
1010 | trans_delay_msecs = tg_pt_gp->tg_pt_gp_trans_delay_msecs; | |
1011 | /* | |
1012 | * Set the secondary ALUA target port access state to OFFLINE | |
1013 | * or release the previously secondary state for struct se_port | |
1014 | */ | |
1015 | if (offline) | |
1016 | atomic_set(&port->sep_tg_pt_secondary_offline, 1); | |
1017 | else | |
1018 | atomic_set(&port->sep_tg_pt_secondary_offline, 0); | |
1019 | ||
1020 | md_buf_len = tg_pt_gp->tg_pt_gp_md_buf_len; | |
1021 | port->sep_tg_pt_secondary_stat = (explict) ? | |
1022 | ALUA_STATUS_ALTERED_BY_EXPLICT_STPG : | |
1023 | ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA; | |
1024 | ||
6708bb27 | 1025 | pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu" |
c66ac9db NB |
1026 | " to secondary access state: %s\n", (explict) ? "explict" : |
1027 | "implict", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item), | |
1028 | tg_pt_gp->tg_pt_gp_id, (offline) ? "OFFLINE" : "ONLINE"); | |
1029 | ||
1030 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1031 | /* | |
1032 | * Do the optional transition delay after we set the secondary | |
1033 | * ALUA access state. | |
1034 | */ | |
1035 | if (trans_delay_msecs != 0) | |
1036 | msleep_interruptible(trans_delay_msecs); | |
1037 | /* | |
1038 | * See if we need to update the ALUA fabric port metadata for | |
1039 | * secondary state and status | |
1040 | */ | |
1041 | if (port->sep_tg_pt_secondary_write_md) { | |
1042 | md_buf = kzalloc(md_buf_len, GFP_KERNEL); | |
6708bb27 AG |
1043 | if (!md_buf) { |
1044 | pr_err("Unable to allocate md_buf for" | |
c66ac9db | 1045 | " secondary ALUA access metadata\n"); |
e3d6f909 | 1046 | return -ENOMEM; |
c66ac9db NB |
1047 | } |
1048 | mutex_lock(&port->sep_tg_pt_md_mutex); | |
1049 | core_alua_update_tpg_secondary_metadata(tg_pt_gp_mem, port, | |
1050 | md_buf, md_buf_len); | |
1051 | mutex_unlock(&port->sep_tg_pt_md_mutex); | |
1052 | ||
1053 | kfree(md_buf); | |
1054 | } | |
1055 | ||
1056 | return 0; | |
1057 | } | |
1058 | ||
1059 | struct t10_alua_lu_gp * | |
1060 | core_alua_allocate_lu_gp(const char *name, int def_group) | |
1061 | { | |
1062 | struct t10_alua_lu_gp *lu_gp; | |
1063 | ||
1064 | lu_gp = kmem_cache_zalloc(t10_alua_lu_gp_cache, GFP_KERNEL); | |
6708bb27 AG |
1065 | if (!lu_gp) { |
1066 | pr_err("Unable to allocate struct t10_alua_lu_gp\n"); | |
6eab04a8 | 1067 | return ERR_PTR(-ENOMEM); |
c66ac9db | 1068 | } |
e3d6f909 | 1069 | INIT_LIST_HEAD(&lu_gp->lu_gp_node); |
c66ac9db NB |
1070 | INIT_LIST_HEAD(&lu_gp->lu_gp_mem_list); |
1071 | spin_lock_init(&lu_gp->lu_gp_lock); | |
1072 | atomic_set(&lu_gp->lu_gp_ref_cnt, 0); | |
1073 | ||
1074 | if (def_group) { | |
e3d6f909 | 1075 | lu_gp->lu_gp_id = alua_lu_gps_counter++; |
c66ac9db | 1076 | lu_gp->lu_gp_valid_id = 1; |
e3d6f909 | 1077 | alua_lu_gps_count++; |
c66ac9db NB |
1078 | } |
1079 | ||
1080 | return lu_gp; | |
1081 | } | |
1082 | ||
1083 | int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *lu_gp, u16 lu_gp_id) | |
1084 | { | |
1085 | struct t10_alua_lu_gp *lu_gp_tmp; | |
1086 | u16 lu_gp_id_tmp; | |
1087 | /* | |
1088 | * The lu_gp->lu_gp_id may only be set once.. | |
1089 | */ | |
1090 | if (lu_gp->lu_gp_valid_id) { | |
6708bb27 | 1091 | pr_warn("ALUA LU Group already has a valid ID," |
c66ac9db | 1092 | " ignoring request\n"); |
e3d6f909 | 1093 | return -EINVAL; |
c66ac9db NB |
1094 | } |
1095 | ||
e3d6f909 AG |
1096 | spin_lock(&lu_gps_lock); |
1097 | if (alua_lu_gps_count == 0x0000ffff) { | |
6708bb27 | 1098 | pr_err("Maximum ALUA alua_lu_gps_count:" |
c66ac9db | 1099 | " 0x0000ffff reached\n"); |
e3d6f909 | 1100 | spin_unlock(&lu_gps_lock); |
c66ac9db | 1101 | kmem_cache_free(t10_alua_lu_gp_cache, lu_gp); |
e3d6f909 | 1102 | return -ENOSPC; |
c66ac9db NB |
1103 | } |
1104 | again: | |
1105 | lu_gp_id_tmp = (lu_gp_id != 0) ? lu_gp_id : | |
e3d6f909 | 1106 | alua_lu_gps_counter++; |
c66ac9db | 1107 | |
e3d6f909 | 1108 | list_for_each_entry(lu_gp_tmp, &lu_gps_list, lu_gp_node) { |
c66ac9db | 1109 | if (lu_gp_tmp->lu_gp_id == lu_gp_id_tmp) { |
6708bb27 | 1110 | if (!lu_gp_id) |
c66ac9db NB |
1111 | goto again; |
1112 | ||
6708bb27 | 1113 | pr_warn("ALUA Logical Unit Group ID: %hu" |
c66ac9db NB |
1114 | " already exists, ignoring request\n", |
1115 | lu_gp_id); | |
e3d6f909 AG |
1116 | spin_unlock(&lu_gps_lock); |
1117 | return -EINVAL; | |
c66ac9db NB |
1118 | } |
1119 | } | |
1120 | ||
1121 | lu_gp->lu_gp_id = lu_gp_id_tmp; | |
1122 | lu_gp->lu_gp_valid_id = 1; | |
e3d6f909 AG |
1123 | list_add_tail(&lu_gp->lu_gp_node, &lu_gps_list); |
1124 | alua_lu_gps_count++; | |
1125 | spin_unlock(&lu_gps_lock); | |
c66ac9db NB |
1126 | |
1127 | return 0; | |
1128 | } | |
1129 | ||
1130 | static struct t10_alua_lu_gp_member * | |
1131 | core_alua_allocate_lu_gp_mem(struct se_device *dev) | |
1132 | { | |
1133 | struct t10_alua_lu_gp_member *lu_gp_mem; | |
1134 | ||
1135 | lu_gp_mem = kmem_cache_zalloc(t10_alua_lu_gp_mem_cache, GFP_KERNEL); | |
6708bb27 AG |
1136 | if (!lu_gp_mem) { |
1137 | pr_err("Unable to allocate struct t10_alua_lu_gp_member\n"); | |
c66ac9db NB |
1138 | return ERR_PTR(-ENOMEM); |
1139 | } | |
1140 | INIT_LIST_HEAD(&lu_gp_mem->lu_gp_mem_list); | |
1141 | spin_lock_init(&lu_gp_mem->lu_gp_mem_lock); | |
1142 | atomic_set(&lu_gp_mem->lu_gp_mem_ref_cnt, 0); | |
1143 | ||
1144 | lu_gp_mem->lu_gp_mem_dev = dev; | |
1145 | dev->dev_alua_lu_gp_mem = lu_gp_mem; | |
1146 | ||
1147 | return lu_gp_mem; | |
1148 | } | |
1149 | ||
1150 | void core_alua_free_lu_gp(struct t10_alua_lu_gp *lu_gp) | |
1151 | { | |
1152 | struct t10_alua_lu_gp_member *lu_gp_mem, *lu_gp_mem_tmp; | |
1153 | /* | |
1154 | * Once we have reached this point, config_item_put() has | |
1155 | * already been called from target_core_alua_drop_lu_gp(). | |
1156 | * | |
1157 | * Here, we remove the *lu_gp from the global list so that | |
1158 | * no associations can be made while we are releasing | |
1159 | * struct t10_alua_lu_gp. | |
1160 | */ | |
e3d6f909 | 1161 | spin_lock(&lu_gps_lock); |
c66ac9db | 1162 | atomic_set(&lu_gp->lu_gp_shutdown, 1); |
e3d6f909 AG |
1163 | list_del(&lu_gp->lu_gp_node); |
1164 | alua_lu_gps_count--; | |
1165 | spin_unlock(&lu_gps_lock); | |
c66ac9db NB |
1166 | /* |
1167 | * Allow struct t10_alua_lu_gp * referenced by core_alua_get_lu_gp_by_name() | |
1168 | * in target_core_configfs.c:target_core_store_alua_lu_gp() to be | |
1169 | * released with core_alua_put_lu_gp_from_name() | |
1170 | */ | |
1171 | while (atomic_read(&lu_gp->lu_gp_ref_cnt)) | |
1172 | cpu_relax(); | |
1173 | /* | |
1174 | * Release reference to struct t10_alua_lu_gp * from all associated | |
1175 | * struct se_device. | |
1176 | */ | |
1177 | spin_lock(&lu_gp->lu_gp_lock); | |
1178 | list_for_each_entry_safe(lu_gp_mem, lu_gp_mem_tmp, | |
1179 | &lu_gp->lu_gp_mem_list, lu_gp_mem_list) { | |
1180 | if (lu_gp_mem->lu_gp_assoc) { | |
1181 | list_del(&lu_gp_mem->lu_gp_mem_list); | |
1182 | lu_gp->lu_gp_members--; | |
1183 | lu_gp_mem->lu_gp_assoc = 0; | |
1184 | } | |
1185 | spin_unlock(&lu_gp->lu_gp_lock); | |
1186 | /* | |
1187 | * | |
25985edc | 1188 | * lu_gp_mem is associated with a single |
c66ac9db NB |
1189 | * struct se_device->dev_alua_lu_gp_mem, and is released when |
1190 | * struct se_device is released via core_alua_free_lu_gp_mem(). | |
1191 | * | |
1192 | * If the passed lu_gp does NOT match the default_lu_gp, assume | |
1193 | * we want to re-assocate a given lu_gp_mem with default_lu_gp. | |
1194 | */ | |
1195 | spin_lock(&lu_gp_mem->lu_gp_mem_lock); | |
e3d6f909 | 1196 | if (lu_gp != default_lu_gp) |
c66ac9db | 1197 | __core_alua_attach_lu_gp_mem(lu_gp_mem, |
e3d6f909 | 1198 | default_lu_gp); |
c66ac9db NB |
1199 | else |
1200 | lu_gp_mem->lu_gp = NULL; | |
1201 | spin_unlock(&lu_gp_mem->lu_gp_mem_lock); | |
1202 | ||
1203 | spin_lock(&lu_gp->lu_gp_lock); | |
1204 | } | |
1205 | spin_unlock(&lu_gp->lu_gp_lock); | |
1206 | ||
1207 | kmem_cache_free(t10_alua_lu_gp_cache, lu_gp); | |
1208 | } | |
1209 | ||
1210 | void core_alua_free_lu_gp_mem(struct se_device *dev) | |
1211 | { | |
1212 | struct se_subsystem_dev *su_dev = dev->se_sub_dev; | |
e3d6f909 | 1213 | struct t10_alua *alua = &su_dev->t10_alua; |
c66ac9db NB |
1214 | struct t10_alua_lu_gp *lu_gp; |
1215 | struct t10_alua_lu_gp_member *lu_gp_mem; | |
1216 | ||
1217 | if (alua->alua_type != SPC3_ALUA_EMULATED) | |
1218 | return; | |
1219 | ||
1220 | lu_gp_mem = dev->dev_alua_lu_gp_mem; | |
6708bb27 | 1221 | if (!lu_gp_mem) |
c66ac9db NB |
1222 | return; |
1223 | ||
1224 | while (atomic_read(&lu_gp_mem->lu_gp_mem_ref_cnt)) | |
1225 | cpu_relax(); | |
1226 | ||
1227 | spin_lock(&lu_gp_mem->lu_gp_mem_lock); | |
1228 | lu_gp = lu_gp_mem->lu_gp; | |
6708bb27 | 1229 | if (lu_gp) { |
c66ac9db NB |
1230 | spin_lock(&lu_gp->lu_gp_lock); |
1231 | if (lu_gp_mem->lu_gp_assoc) { | |
1232 | list_del(&lu_gp_mem->lu_gp_mem_list); | |
1233 | lu_gp->lu_gp_members--; | |
1234 | lu_gp_mem->lu_gp_assoc = 0; | |
1235 | } | |
1236 | spin_unlock(&lu_gp->lu_gp_lock); | |
1237 | lu_gp_mem->lu_gp = NULL; | |
1238 | } | |
1239 | spin_unlock(&lu_gp_mem->lu_gp_mem_lock); | |
1240 | ||
1241 | kmem_cache_free(t10_alua_lu_gp_mem_cache, lu_gp_mem); | |
1242 | } | |
1243 | ||
1244 | struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *name) | |
1245 | { | |
1246 | struct t10_alua_lu_gp *lu_gp; | |
1247 | struct config_item *ci; | |
1248 | ||
e3d6f909 AG |
1249 | spin_lock(&lu_gps_lock); |
1250 | list_for_each_entry(lu_gp, &lu_gps_list, lu_gp_node) { | |
6708bb27 | 1251 | if (!lu_gp->lu_gp_valid_id) |
c66ac9db NB |
1252 | continue; |
1253 | ci = &lu_gp->lu_gp_group.cg_item; | |
6708bb27 | 1254 | if (!strcmp(config_item_name(ci), name)) { |
c66ac9db | 1255 | atomic_inc(&lu_gp->lu_gp_ref_cnt); |
e3d6f909 | 1256 | spin_unlock(&lu_gps_lock); |
c66ac9db NB |
1257 | return lu_gp; |
1258 | } | |
1259 | } | |
e3d6f909 | 1260 | spin_unlock(&lu_gps_lock); |
c66ac9db NB |
1261 | |
1262 | return NULL; | |
1263 | } | |
1264 | ||
1265 | void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *lu_gp) | |
1266 | { | |
e3d6f909 | 1267 | spin_lock(&lu_gps_lock); |
c66ac9db | 1268 | atomic_dec(&lu_gp->lu_gp_ref_cnt); |
e3d6f909 | 1269 | spin_unlock(&lu_gps_lock); |
c66ac9db NB |
1270 | } |
1271 | ||
1272 | /* | |
1273 | * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock | |
1274 | */ | |
1275 | void __core_alua_attach_lu_gp_mem( | |
1276 | struct t10_alua_lu_gp_member *lu_gp_mem, | |
1277 | struct t10_alua_lu_gp *lu_gp) | |
1278 | { | |
1279 | spin_lock(&lu_gp->lu_gp_lock); | |
1280 | lu_gp_mem->lu_gp = lu_gp; | |
1281 | lu_gp_mem->lu_gp_assoc = 1; | |
1282 | list_add_tail(&lu_gp_mem->lu_gp_mem_list, &lu_gp->lu_gp_mem_list); | |
1283 | lu_gp->lu_gp_members++; | |
1284 | spin_unlock(&lu_gp->lu_gp_lock); | |
1285 | } | |
1286 | ||
1287 | /* | |
1288 | * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock | |
1289 | */ | |
1290 | void __core_alua_drop_lu_gp_mem( | |
1291 | struct t10_alua_lu_gp_member *lu_gp_mem, | |
1292 | struct t10_alua_lu_gp *lu_gp) | |
1293 | { | |
1294 | spin_lock(&lu_gp->lu_gp_lock); | |
1295 | list_del(&lu_gp_mem->lu_gp_mem_list); | |
1296 | lu_gp_mem->lu_gp = NULL; | |
1297 | lu_gp_mem->lu_gp_assoc = 0; | |
1298 | lu_gp->lu_gp_members--; | |
1299 | spin_unlock(&lu_gp->lu_gp_lock); | |
1300 | } | |
1301 | ||
1302 | struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp( | |
1303 | struct se_subsystem_dev *su_dev, | |
1304 | const char *name, | |
1305 | int def_group) | |
1306 | { | |
1307 | struct t10_alua_tg_pt_gp *tg_pt_gp; | |
1308 | ||
1309 | tg_pt_gp = kmem_cache_zalloc(t10_alua_tg_pt_gp_cache, GFP_KERNEL); | |
6708bb27 AG |
1310 | if (!tg_pt_gp) { |
1311 | pr_err("Unable to allocate struct t10_alua_tg_pt_gp\n"); | |
c66ac9db NB |
1312 | return NULL; |
1313 | } | |
1314 | INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_list); | |
1315 | INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_mem_list); | |
1316 | mutex_init(&tg_pt_gp->tg_pt_gp_md_mutex); | |
1317 | spin_lock_init(&tg_pt_gp->tg_pt_gp_lock); | |
1318 | atomic_set(&tg_pt_gp->tg_pt_gp_ref_cnt, 0); | |
1319 | tg_pt_gp->tg_pt_gp_su_dev = su_dev; | |
1320 | tg_pt_gp->tg_pt_gp_md_buf_len = ALUA_MD_BUF_LEN; | |
1321 | atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, | |
1322 | ALUA_ACCESS_STATE_ACTIVE_OPTMIZED); | |
1323 | /* | |
1324 | * Enable both explict and implict ALUA support by default | |
1325 | */ | |
1326 | tg_pt_gp->tg_pt_gp_alua_access_type = | |
1327 | TPGS_EXPLICT_ALUA | TPGS_IMPLICT_ALUA; | |
1328 | /* | |
1329 | * Set the default Active/NonOptimized Delay in milliseconds | |
1330 | */ | |
1331 | tg_pt_gp->tg_pt_gp_nonop_delay_msecs = ALUA_DEFAULT_NONOP_DELAY_MSECS; | |
1332 | tg_pt_gp->tg_pt_gp_trans_delay_msecs = ALUA_DEFAULT_TRANS_DELAY_MSECS; | |
1333 | ||
1334 | if (def_group) { | |
e3d6f909 | 1335 | spin_lock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db | 1336 | tg_pt_gp->tg_pt_gp_id = |
e3d6f909 | 1337 | su_dev->t10_alua.alua_tg_pt_gps_counter++; |
c66ac9db | 1338 | tg_pt_gp->tg_pt_gp_valid_id = 1; |
e3d6f909 | 1339 | su_dev->t10_alua.alua_tg_pt_gps_count++; |
c66ac9db | 1340 | list_add_tail(&tg_pt_gp->tg_pt_gp_list, |
e3d6f909 AG |
1341 | &su_dev->t10_alua.tg_pt_gps_list); |
1342 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); | |
c66ac9db NB |
1343 | } |
1344 | ||
1345 | return tg_pt_gp; | |
1346 | } | |
1347 | ||
1348 | int core_alua_set_tg_pt_gp_id( | |
1349 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1350 | u16 tg_pt_gp_id) | |
1351 | { | |
1352 | struct se_subsystem_dev *su_dev = tg_pt_gp->tg_pt_gp_su_dev; | |
1353 | struct t10_alua_tg_pt_gp *tg_pt_gp_tmp; | |
1354 | u16 tg_pt_gp_id_tmp; | |
1355 | /* | |
1356 | * The tg_pt_gp->tg_pt_gp_id may only be set once.. | |
1357 | */ | |
1358 | if (tg_pt_gp->tg_pt_gp_valid_id) { | |
6708bb27 | 1359 | pr_warn("ALUA TG PT Group already has a valid ID," |
c66ac9db | 1360 | " ignoring request\n"); |
e3d6f909 | 1361 | return -EINVAL; |
c66ac9db NB |
1362 | } |
1363 | ||
e3d6f909 AG |
1364 | spin_lock(&su_dev->t10_alua.tg_pt_gps_lock); |
1365 | if (su_dev->t10_alua.alua_tg_pt_gps_count == 0x0000ffff) { | |
6708bb27 | 1366 | pr_err("Maximum ALUA alua_tg_pt_gps_count:" |
c66ac9db | 1367 | " 0x0000ffff reached\n"); |
e3d6f909 | 1368 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db | 1369 | kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp); |
e3d6f909 | 1370 | return -ENOSPC; |
c66ac9db NB |
1371 | } |
1372 | again: | |
1373 | tg_pt_gp_id_tmp = (tg_pt_gp_id != 0) ? tg_pt_gp_id : | |
e3d6f909 | 1374 | su_dev->t10_alua.alua_tg_pt_gps_counter++; |
c66ac9db | 1375 | |
e3d6f909 | 1376 | list_for_each_entry(tg_pt_gp_tmp, &su_dev->t10_alua.tg_pt_gps_list, |
c66ac9db NB |
1377 | tg_pt_gp_list) { |
1378 | if (tg_pt_gp_tmp->tg_pt_gp_id == tg_pt_gp_id_tmp) { | |
6708bb27 | 1379 | if (!tg_pt_gp_id) |
c66ac9db NB |
1380 | goto again; |
1381 | ||
6708bb27 | 1382 | pr_err("ALUA Target Port Group ID: %hu already" |
c66ac9db | 1383 | " exists, ignoring request\n", tg_pt_gp_id); |
e3d6f909 AG |
1384 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); |
1385 | return -EINVAL; | |
c66ac9db NB |
1386 | } |
1387 | } | |
1388 | ||
1389 | tg_pt_gp->tg_pt_gp_id = tg_pt_gp_id_tmp; | |
1390 | tg_pt_gp->tg_pt_gp_valid_id = 1; | |
1391 | list_add_tail(&tg_pt_gp->tg_pt_gp_list, | |
e3d6f909 AG |
1392 | &su_dev->t10_alua.tg_pt_gps_list); |
1393 | su_dev->t10_alua.alua_tg_pt_gps_count++; | |
1394 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); | |
c66ac9db NB |
1395 | |
1396 | return 0; | |
1397 | } | |
1398 | ||
1399 | struct t10_alua_tg_pt_gp_member *core_alua_allocate_tg_pt_gp_mem( | |
1400 | struct se_port *port) | |
1401 | { | |
1402 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; | |
1403 | ||
1404 | tg_pt_gp_mem = kmem_cache_zalloc(t10_alua_tg_pt_gp_mem_cache, | |
1405 | GFP_KERNEL); | |
6708bb27 AG |
1406 | if (!tg_pt_gp_mem) { |
1407 | pr_err("Unable to allocate struct t10_alua_tg_pt_gp_member\n"); | |
c66ac9db NB |
1408 | return ERR_PTR(-ENOMEM); |
1409 | } | |
1410 | INIT_LIST_HEAD(&tg_pt_gp_mem->tg_pt_gp_mem_list); | |
1411 | spin_lock_init(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1412 | atomic_set(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt, 0); | |
1413 | ||
1414 | tg_pt_gp_mem->tg_pt = port; | |
1415 | port->sep_alua_tg_pt_gp_mem = tg_pt_gp_mem; | |
1416 | atomic_set(&port->sep_tg_pt_gp_active, 1); | |
1417 | ||
1418 | return tg_pt_gp_mem; | |
1419 | } | |
1420 | ||
1421 | void core_alua_free_tg_pt_gp( | |
1422 | struct t10_alua_tg_pt_gp *tg_pt_gp) | |
1423 | { | |
1424 | struct se_subsystem_dev *su_dev = tg_pt_gp->tg_pt_gp_su_dev; | |
1425 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *tg_pt_gp_mem_tmp; | |
1426 | /* | |
1427 | * Once we have reached this point, config_item_put() has already | |
1428 | * been called from target_core_alua_drop_tg_pt_gp(). | |
1429 | * | |
1430 | * Here we remove *tg_pt_gp from the global list so that | |
1431 | * no assications *OR* explict ALUA via SET_TARGET_PORT_GROUPS | |
1432 | * can be made while we are releasing struct t10_alua_tg_pt_gp. | |
1433 | */ | |
e3d6f909 | 1434 | spin_lock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db | 1435 | list_del(&tg_pt_gp->tg_pt_gp_list); |
e3d6f909 AG |
1436 | su_dev->t10_alua.alua_tg_pt_gps_counter--; |
1437 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); | |
c66ac9db NB |
1438 | /* |
1439 | * Allow a struct t10_alua_tg_pt_gp_member * referenced by | |
1440 | * core_alua_get_tg_pt_gp_by_name() in | |
1441 | * target_core_configfs.c:target_core_store_alua_tg_pt_gp() | |
1442 | * to be released with core_alua_put_tg_pt_gp_from_name(). | |
1443 | */ | |
1444 | while (atomic_read(&tg_pt_gp->tg_pt_gp_ref_cnt)) | |
1445 | cpu_relax(); | |
1446 | /* | |
1447 | * Release reference to struct t10_alua_tg_pt_gp from all associated | |
1448 | * struct se_port. | |
1449 | */ | |
1450 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); | |
1451 | list_for_each_entry_safe(tg_pt_gp_mem, tg_pt_gp_mem_tmp, | |
1452 | &tg_pt_gp->tg_pt_gp_mem_list, tg_pt_gp_mem_list) { | |
1453 | if (tg_pt_gp_mem->tg_pt_gp_assoc) { | |
1454 | list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list); | |
1455 | tg_pt_gp->tg_pt_gp_members--; | |
1456 | tg_pt_gp_mem->tg_pt_gp_assoc = 0; | |
1457 | } | |
1458 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); | |
1459 | /* | |
25985edc | 1460 | * tg_pt_gp_mem is associated with a single |
c66ac9db NB |
1461 | * se_port->sep_alua_tg_pt_gp_mem, and is released via |
1462 | * core_alua_free_tg_pt_gp_mem(). | |
1463 | * | |
1464 | * If the passed tg_pt_gp does NOT match the default_tg_pt_gp, | |
1465 | * assume we want to re-assocate a given tg_pt_gp_mem with | |
1466 | * default_tg_pt_gp. | |
1467 | */ | |
1468 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
e3d6f909 | 1469 | if (tg_pt_gp != su_dev->t10_alua.default_tg_pt_gp) { |
c66ac9db | 1470 | __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, |
e3d6f909 | 1471 | su_dev->t10_alua.default_tg_pt_gp); |
c66ac9db NB |
1472 | } else |
1473 | tg_pt_gp_mem->tg_pt_gp = NULL; | |
1474 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1475 | ||
1476 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); | |
1477 | } | |
1478 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); | |
1479 | ||
1480 | kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp); | |
1481 | } | |
1482 | ||
1483 | void core_alua_free_tg_pt_gp_mem(struct se_port *port) | |
1484 | { | |
1485 | struct se_subsystem_dev *su_dev = port->sep_lun->lun_se_dev->se_sub_dev; | |
e3d6f909 | 1486 | struct t10_alua *alua = &su_dev->t10_alua; |
c66ac9db NB |
1487 | struct t10_alua_tg_pt_gp *tg_pt_gp; |
1488 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; | |
1489 | ||
1490 | if (alua->alua_type != SPC3_ALUA_EMULATED) | |
1491 | return; | |
1492 | ||
1493 | tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; | |
6708bb27 | 1494 | if (!tg_pt_gp_mem) |
c66ac9db NB |
1495 | return; |
1496 | ||
1497 | while (atomic_read(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt)) | |
1498 | cpu_relax(); | |
1499 | ||
1500 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1501 | tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; | |
6708bb27 | 1502 | if (tg_pt_gp) { |
c66ac9db NB |
1503 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); |
1504 | if (tg_pt_gp_mem->tg_pt_gp_assoc) { | |
1505 | list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list); | |
1506 | tg_pt_gp->tg_pt_gp_members--; | |
1507 | tg_pt_gp_mem->tg_pt_gp_assoc = 0; | |
1508 | } | |
1509 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); | |
1510 | tg_pt_gp_mem->tg_pt_gp = NULL; | |
1511 | } | |
1512 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1513 | ||
1514 | kmem_cache_free(t10_alua_tg_pt_gp_mem_cache, tg_pt_gp_mem); | |
1515 | } | |
1516 | ||
1517 | static struct t10_alua_tg_pt_gp *core_alua_get_tg_pt_gp_by_name( | |
1518 | struct se_subsystem_dev *su_dev, | |
1519 | const char *name) | |
1520 | { | |
1521 | struct t10_alua_tg_pt_gp *tg_pt_gp; | |
1522 | struct config_item *ci; | |
1523 | ||
e3d6f909 AG |
1524 | spin_lock(&su_dev->t10_alua.tg_pt_gps_lock); |
1525 | list_for_each_entry(tg_pt_gp, &su_dev->t10_alua.tg_pt_gps_list, | |
c66ac9db | 1526 | tg_pt_gp_list) { |
6708bb27 | 1527 | if (!tg_pt_gp->tg_pt_gp_valid_id) |
c66ac9db NB |
1528 | continue; |
1529 | ci = &tg_pt_gp->tg_pt_gp_group.cg_item; | |
6708bb27 | 1530 | if (!strcmp(config_item_name(ci), name)) { |
c66ac9db | 1531 | atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt); |
e3d6f909 | 1532 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
1533 | return tg_pt_gp; |
1534 | } | |
1535 | } | |
e3d6f909 | 1536 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
1537 | |
1538 | return NULL; | |
1539 | } | |
1540 | ||
1541 | static void core_alua_put_tg_pt_gp_from_name( | |
1542 | struct t10_alua_tg_pt_gp *tg_pt_gp) | |
1543 | { | |
1544 | struct se_subsystem_dev *su_dev = tg_pt_gp->tg_pt_gp_su_dev; | |
1545 | ||
e3d6f909 | 1546 | spin_lock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db | 1547 | atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt); |
e3d6f909 | 1548 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
1549 | } |
1550 | ||
1551 | /* | |
1552 | * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held | |
1553 | */ | |
1554 | void __core_alua_attach_tg_pt_gp_mem( | |
1555 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, | |
1556 | struct t10_alua_tg_pt_gp *tg_pt_gp) | |
1557 | { | |
1558 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); | |
1559 | tg_pt_gp_mem->tg_pt_gp = tg_pt_gp; | |
1560 | tg_pt_gp_mem->tg_pt_gp_assoc = 1; | |
1561 | list_add_tail(&tg_pt_gp_mem->tg_pt_gp_mem_list, | |
1562 | &tg_pt_gp->tg_pt_gp_mem_list); | |
1563 | tg_pt_gp->tg_pt_gp_members++; | |
1564 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); | |
1565 | } | |
1566 | ||
1567 | /* | |
1568 | * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held | |
1569 | */ | |
1570 | static void __core_alua_drop_tg_pt_gp_mem( | |
1571 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, | |
1572 | struct t10_alua_tg_pt_gp *tg_pt_gp) | |
1573 | { | |
1574 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); | |
1575 | list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list); | |
1576 | tg_pt_gp_mem->tg_pt_gp = NULL; | |
1577 | tg_pt_gp_mem->tg_pt_gp_assoc = 0; | |
1578 | tg_pt_gp->tg_pt_gp_members--; | |
1579 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); | |
1580 | } | |
1581 | ||
1582 | ssize_t core_alua_show_tg_pt_gp_info(struct se_port *port, char *page) | |
1583 | { | |
1584 | struct se_subsystem_dev *su_dev = port->sep_lun->lun_se_dev->se_sub_dev; | |
1585 | struct config_item *tg_pt_ci; | |
e3d6f909 | 1586 | struct t10_alua *alua = &su_dev->t10_alua; |
c66ac9db NB |
1587 | struct t10_alua_tg_pt_gp *tg_pt_gp; |
1588 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; | |
1589 | ssize_t len = 0; | |
1590 | ||
1591 | if (alua->alua_type != SPC3_ALUA_EMULATED) | |
1592 | return len; | |
1593 | ||
1594 | tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; | |
6708bb27 | 1595 | if (!tg_pt_gp_mem) |
c66ac9db NB |
1596 | return len; |
1597 | ||
1598 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1599 | tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; | |
6708bb27 | 1600 | if (tg_pt_gp) { |
c66ac9db NB |
1601 | tg_pt_ci = &tg_pt_gp->tg_pt_gp_group.cg_item; |
1602 | len += sprintf(page, "TG Port Alias: %s\nTG Port Group ID:" | |
1603 | " %hu\nTG Port Primary Access State: %s\nTG Port " | |
1604 | "Primary Access Status: %s\nTG Port Secondary Access" | |
1605 | " State: %s\nTG Port Secondary Access Status: %s\n", | |
1606 | config_item_name(tg_pt_ci), tg_pt_gp->tg_pt_gp_id, | |
1607 | core_alua_dump_state(atomic_read( | |
1608 | &tg_pt_gp->tg_pt_gp_alua_access_state)), | |
1609 | core_alua_dump_status( | |
1610 | tg_pt_gp->tg_pt_gp_alua_access_status), | |
1611 | (atomic_read(&port->sep_tg_pt_secondary_offline)) ? | |
1612 | "Offline" : "None", | |
1613 | core_alua_dump_status(port->sep_tg_pt_secondary_stat)); | |
1614 | } | |
1615 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1616 | ||
1617 | return len; | |
1618 | } | |
1619 | ||
1620 | ssize_t core_alua_store_tg_pt_gp_info( | |
1621 | struct se_port *port, | |
1622 | const char *page, | |
1623 | size_t count) | |
1624 | { | |
1625 | struct se_portal_group *tpg; | |
1626 | struct se_lun *lun; | |
1627 | struct se_subsystem_dev *su_dev = port->sep_lun->lun_se_dev->se_sub_dev; | |
1628 | struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *tg_pt_gp_new = NULL; | |
1629 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; | |
1630 | unsigned char buf[TG_PT_GROUP_NAME_BUF]; | |
1631 | int move = 0; | |
1632 | ||
1633 | tpg = port->sep_tpg; | |
1634 | lun = port->sep_lun; | |
1635 | ||
e3d6f909 | 1636 | if (su_dev->t10_alua.alua_type != SPC3_ALUA_EMULATED) { |
6708bb27 | 1637 | pr_warn("SPC3_ALUA_EMULATED not enabled for" |
e3d6f909 AG |
1638 | " %s/tpgt_%hu/%s\n", tpg->se_tpg_tfo->tpg_get_wwn(tpg), |
1639 | tpg->se_tpg_tfo->tpg_get_tag(tpg), | |
c66ac9db NB |
1640 | config_item_name(&lun->lun_group.cg_item)); |
1641 | return -EINVAL; | |
1642 | } | |
1643 | ||
1644 | if (count > TG_PT_GROUP_NAME_BUF) { | |
6708bb27 | 1645 | pr_err("ALUA Target Port Group alias too large!\n"); |
c66ac9db NB |
1646 | return -EINVAL; |
1647 | } | |
1648 | memset(buf, 0, TG_PT_GROUP_NAME_BUF); | |
1649 | memcpy(buf, page, count); | |
1650 | /* | |
1651 | * Any ALUA target port group alias besides "NULL" means we will be | |
1652 | * making a new group association. | |
1653 | */ | |
1654 | if (strcmp(strstrip(buf), "NULL")) { | |
1655 | /* | |
1656 | * core_alua_get_tg_pt_gp_by_name() will increment reference to | |
1657 | * struct t10_alua_tg_pt_gp. This reference is released with | |
1658 | * core_alua_put_tg_pt_gp_from_name() below. | |
1659 | */ | |
1660 | tg_pt_gp_new = core_alua_get_tg_pt_gp_by_name(su_dev, | |
1661 | strstrip(buf)); | |
6708bb27 | 1662 | if (!tg_pt_gp_new) |
c66ac9db NB |
1663 | return -ENODEV; |
1664 | } | |
1665 | tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; | |
6708bb27 | 1666 | if (!tg_pt_gp_mem) { |
c66ac9db NB |
1667 | if (tg_pt_gp_new) |
1668 | core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new); | |
6708bb27 | 1669 | pr_err("NULL struct se_port->sep_alua_tg_pt_gp_mem pointer\n"); |
c66ac9db NB |
1670 | return -EINVAL; |
1671 | } | |
1672 | ||
1673 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1674 | tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; | |
6708bb27 | 1675 | if (tg_pt_gp) { |
c66ac9db NB |
1676 | /* |
1677 | * Clearing an existing tg_pt_gp association, and replacing | |
1678 | * with the default_tg_pt_gp. | |
1679 | */ | |
6708bb27 AG |
1680 | if (!tg_pt_gp_new) { |
1681 | pr_debug("Target_Core_ConfigFS: Moving" | |
c66ac9db NB |
1682 | " %s/tpgt_%hu/%s from ALUA Target Port Group:" |
1683 | " alua/%s, ID: %hu back to" | |
1684 | " default_tg_pt_gp\n", | |
e3d6f909 AG |
1685 | tpg->se_tpg_tfo->tpg_get_wwn(tpg), |
1686 | tpg->se_tpg_tfo->tpg_get_tag(tpg), | |
c66ac9db NB |
1687 | config_item_name(&lun->lun_group.cg_item), |
1688 | config_item_name( | |
1689 | &tg_pt_gp->tg_pt_gp_group.cg_item), | |
1690 | tg_pt_gp->tg_pt_gp_id); | |
1691 | ||
1692 | __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp); | |
1693 | __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, | |
e3d6f909 | 1694 | su_dev->t10_alua.default_tg_pt_gp); |
c66ac9db NB |
1695 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
1696 | ||
1697 | return count; | |
1698 | } | |
1699 | /* | |
1700 | * Removing existing association of tg_pt_gp_mem with tg_pt_gp | |
1701 | */ | |
1702 | __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp); | |
1703 | move = 1; | |
1704 | } | |
1705 | /* | |
1706 | * Associate tg_pt_gp_mem with tg_pt_gp_new. | |
1707 | */ | |
1708 | __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp_new); | |
1709 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
6708bb27 | 1710 | pr_debug("Target_Core_ConfigFS: %s %s/tpgt_%hu/%s to ALUA" |
c66ac9db | 1711 | " Target Port Group: alua/%s, ID: %hu\n", (move) ? |
e3d6f909 AG |
1712 | "Moving" : "Adding", tpg->se_tpg_tfo->tpg_get_wwn(tpg), |
1713 | tpg->se_tpg_tfo->tpg_get_tag(tpg), | |
c66ac9db NB |
1714 | config_item_name(&lun->lun_group.cg_item), |
1715 | config_item_name(&tg_pt_gp_new->tg_pt_gp_group.cg_item), | |
1716 | tg_pt_gp_new->tg_pt_gp_id); | |
1717 | ||
1718 | core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new); | |
1719 | return count; | |
1720 | } | |
1721 | ||
1722 | ssize_t core_alua_show_access_type( | |
1723 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1724 | char *page) | |
1725 | { | |
1726 | if ((tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA) && | |
1727 | (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICT_ALUA)) | |
1728 | return sprintf(page, "Implict and Explict\n"); | |
1729 | else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICT_ALUA) | |
1730 | return sprintf(page, "Implict\n"); | |
1731 | else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA) | |
1732 | return sprintf(page, "Explict\n"); | |
1733 | else | |
1734 | return sprintf(page, "None\n"); | |
1735 | } | |
1736 | ||
1737 | ssize_t core_alua_store_access_type( | |
1738 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1739 | const char *page, | |
1740 | size_t count) | |
1741 | { | |
1742 | unsigned long tmp; | |
1743 | int ret; | |
1744 | ||
1745 | ret = strict_strtoul(page, 0, &tmp); | |
1746 | if (ret < 0) { | |
6708bb27 | 1747 | pr_err("Unable to extract alua_access_type\n"); |
c66ac9db NB |
1748 | return -EINVAL; |
1749 | } | |
1750 | if ((tmp != 0) && (tmp != 1) && (tmp != 2) && (tmp != 3)) { | |
6708bb27 | 1751 | pr_err("Illegal value for alua_access_type:" |
c66ac9db NB |
1752 | " %lu\n", tmp); |
1753 | return -EINVAL; | |
1754 | } | |
1755 | if (tmp == 3) | |
1756 | tg_pt_gp->tg_pt_gp_alua_access_type = | |
1757 | TPGS_IMPLICT_ALUA | TPGS_EXPLICT_ALUA; | |
1758 | else if (tmp == 2) | |
1759 | tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_EXPLICT_ALUA; | |
1760 | else if (tmp == 1) | |
1761 | tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_IMPLICT_ALUA; | |
1762 | else | |
1763 | tg_pt_gp->tg_pt_gp_alua_access_type = 0; | |
1764 | ||
1765 | return count; | |
1766 | } | |
1767 | ||
1768 | ssize_t core_alua_show_nonop_delay_msecs( | |
1769 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1770 | char *page) | |
1771 | { | |
1772 | return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_nonop_delay_msecs); | |
1773 | } | |
1774 | ||
1775 | ssize_t core_alua_store_nonop_delay_msecs( | |
1776 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1777 | const char *page, | |
1778 | size_t count) | |
1779 | { | |
1780 | unsigned long tmp; | |
1781 | int ret; | |
1782 | ||
1783 | ret = strict_strtoul(page, 0, &tmp); | |
1784 | if (ret < 0) { | |
6708bb27 | 1785 | pr_err("Unable to extract nonop_delay_msecs\n"); |
c66ac9db NB |
1786 | return -EINVAL; |
1787 | } | |
1788 | if (tmp > ALUA_MAX_NONOP_DELAY_MSECS) { | |
6708bb27 | 1789 | pr_err("Passed nonop_delay_msecs: %lu, exceeds" |
c66ac9db NB |
1790 | " ALUA_MAX_NONOP_DELAY_MSECS: %d\n", tmp, |
1791 | ALUA_MAX_NONOP_DELAY_MSECS); | |
1792 | return -EINVAL; | |
1793 | } | |
1794 | tg_pt_gp->tg_pt_gp_nonop_delay_msecs = (int)tmp; | |
1795 | ||
1796 | return count; | |
1797 | } | |
1798 | ||
1799 | ssize_t core_alua_show_trans_delay_msecs( | |
1800 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1801 | char *page) | |
1802 | { | |
1803 | return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_trans_delay_msecs); | |
1804 | } | |
1805 | ||
1806 | ssize_t core_alua_store_trans_delay_msecs( | |
1807 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1808 | const char *page, | |
1809 | size_t count) | |
1810 | { | |
1811 | unsigned long tmp; | |
1812 | int ret; | |
1813 | ||
1814 | ret = strict_strtoul(page, 0, &tmp); | |
1815 | if (ret < 0) { | |
6708bb27 | 1816 | pr_err("Unable to extract trans_delay_msecs\n"); |
c66ac9db NB |
1817 | return -EINVAL; |
1818 | } | |
1819 | if (tmp > ALUA_MAX_TRANS_DELAY_MSECS) { | |
6708bb27 | 1820 | pr_err("Passed trans_delay_msecs: %lu, exceeds" |
c66ac9db NB |
1821 | " ALUA_MAX_TRANS_DELAY_MSECS: %d\n", tmp, |
1822 | ALUA_MAX_TRANS_DELAY_MSECS); | |
1823 | return -EINVAL; | |
1824 | } | |
1825 | tg_pt_gp->tg_pt_gp_trans_delay_msecs = (int)tmp; | |
1826 | ||
1827 | return count; | |
1828 | } | |
1829 | ||
1830 | ssize_t core_alua_show_preferred_bit( | |
1831 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1832 | char *page) | |
1833 | { | |
1834 | return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_pref); | |
1835 | } | |
1836 | ||
1837 | ssize_t core_alua_store_preferred_bit( | |
1838 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1839 | const char *page, | |
1840 | size_t count) | |
1841 | { | |
1842 | unsigned long tmp; | |
1843 | int ret; | |
1844 | ||
1845 | ret = strict_strtoul(page, 0, &tmp); | |
1846 | if (ret < 0) { | |
6708bb27 | 1847 | pr_err("Unable to extract preferred ALUA value\n"); |
c66ac9db NB |
1848 | return -EINVAL; |
1849 | } | |
1850 | if ((tmp != 0) && (tmp != 1)) { | |
6708bb27 | 1851 | pr_err("Illegal value for preferred ALUA: %lu\n", tmp); |
c66ac9db NB |
1852 | return -EINVAL; |
1853 | } | |
1854 | tg_pt_gp->tg_pt_gp_pref = (int)tmp; | |
1855 | ||
1856 | return count; | |
1857 | } | |
1858 | ||
1859 | ssize_t core_alua_show_offline_bit(struct se_lun *lun, char *page) | |
1860 | { | |
6708bb27 | 1861 | if (!lun->lun_sep) |
c66ac9db NB |
1862 | return -ENODEV; |
1863 | ||
1864 | return sprintf(page, "%d\n", | |
1865 | atomic_read(&lun->lun_sep->sep_tg_pt_secondary_offline)); | |
1866 | } | |
1867 | ||
1868 | ssize_t core_alua_store_offline_bit( | |
1869 | struct se_lun *lun, | |
1870 | const char *page, | |
1871 | size_t count) | |
1872 | { | |
1873 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; | |
1874 | unsigned long tmp; | |
1875 | int ret; | |
1876 | ||
6708bb27 | 1877 | if (!lun->lun_sep) |
c66ac9db NB |
1878 | return -ENODEV; |
1879 | ||
1880 | ret = strict_strtoul(page, 0, &tmp); | |
1881 | if (ret < 0) { | |
6708bb27 | 1882 | pr_err("Unable to extract alua_tg_pt_offline value\n"); |
c66ac9db NB |
1883 | return -EINVAL; |
1884 | } | |
1885 | if ((tmp != 0) && (tmp != 1)) { | |
6708bb27 | 1886 | pr_err("Illegal value for alua_tg_pt_offline: %lu\n", |
c66ac9db NB |
1887 | tmp); |
1888 | return -EINVAL; | |
1889 | } | |
1890 | tg_pt_gp_mem = lun->lun_sep->sep_alua_tg_pt_gp_mem; | |
6708bb27 AG |
1891 | if (!tg_pt_gp_mem) { |
1892 | pr_err("Unable to locate *tg_pt_gp_mem\n"); | |
c66ac9db NB |
1893 | return -EINVAL; |
1894 | } | |
1895 | ||
1896 | ret = core_alua_set_tg_pt_secondary_state(tg_pt_gp_mem, | |
1897 | lun->lun_sep, 0, (int)tmp); | |
1898 | if (ret < 0) | |
1899 | return -EINVAL; | |
1900 | ||
1901 | return count; | |
1902 | } | |
1903 | ||
1904 | ssize_t core_alua_show_secondary_status( | |
1905 | struct se_lun *lun, | |
1906 | char *page) | |
1907 | { | |
1908 | return sprintf(page, "%d\n", lun->lun_sep->sep_tg_pt_secondary_stat); | |
1909 | } | |
1910 | ||
1911 | ssize_t core_alua_store_secondary_status( | |
1912 | struct se_lun *lun, | |
1913 | const char *page, | |
1914 | size_t count) | |
1915 | { | |
1916 | unsigned long tmp; | |
1917 | int ret; | |
1918 | ||
1919 | ret = strict_strtoul(page, 0, &tmp); | |
1920 | if (ret < 0) { | |
6708bb27 | 1921 | pr_err("Unable to extract alua_tg_pt_status\n"); |
c66ac9db NB |
1922 | return -EINVAL; |
1923 | } | |
1924 | if ((tmp != ALUA_STATUS_NONE) && | |
1925 | (tmp != ALUA_STATUS_ALTERED_BY_EXPLICT_STPG) && | |
1926 | (tmp != ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA)) { | |
6708bb27 | 1927 | pr_err("Illegal value for alua_tg_pt_status: %lu\n", |
c66ac9db NB |
1928 | tmp); |
1929 | return -EINVAL; | |
1930 | } | |
1931 | lun->lun_sep->sep_tg_pt_secondary_stat = (int)tmp; | |
1932 | ||
1933 | return count; | |
1934 | } | |
1935 | ||
1936 | ssize_t core_alua_show_secondary_write_metadata( | |
1937 | struct se_lun *lun, | |
1938 | char *page) | |
1939 | { | |
1940 | return sprintf(page, "%d\n", | |
1941 | lun->lun_sep->sep_tg_pt_secondary_write_md); | |
1942 | } | |
1943 | ||
1944 | ssize_t core_alua_store_secondary_write_metadata( | |
1945 | struct se_lun *lun, | |
1946 | const char *page, | |
1947 | size_t count) | |
1948 | { | |
1949 | unsigned long tmp; | |
1950 | int ret; | |
1951 | ||
1952 | ret = strict_strtoul(page, 0, &tmp); | |
1953 | if (ret < 0) { | |
6708bb27 | 1954 | pr_err("Unable to extract alua_tg_pt_write_md\n"); |
c66ac9db NB |
1955 | return -EINVAL; |
1956 | } | |
1957 | if ((tmp != 0) && (tmp != 1)) { | |
6708bb27 | 1958 | pr_err("Illegal value for alua_tg_pt_write_md:" |
c66ac9db NB |
1959 | " %lu\n", tmp); |
1960 | return -EINVAL; | |
1961 | } | |
1962 | lun->lun_sep->sep_tg_pt_secondary_write_md = (int)tmp; | |
1963 | ||
1964 | return count; | |
1965 | } | |
1966 | ||
1967 | int core_setup_alua(struct se_device *dev, int force_pt) | |
1968 | { | |
1969 | struct se_subsystem_dev *su_dev = dev->se_sub_dev; | |
e3d6f909 | 1970 | struct t10_alua *alua = &su_dev->t10_alua; |
c66ac9db NB |
1971 | struct t10_alua_lu_gp_member *lu_gp_mem; |
1972 | /* | |
1973 | * If this device is from Target_Core_Mod/pSCSI, use the ALUA logic | |
1974 | * of the Underlying SCSI hardware. In Linux/SCSI terms, this can | |
1975 | * cause a problem because libata and some SATA RAID HBAs appear | |
1976 | * under Linux/SCSI, but emulate SCSI logic themselves. | |
1977 | */ | |
e3d6f909 AG |
1978 | if (((dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) && |
1979 | !(dev->se_sub_dev->se_dev_attrib.emulate_alua)) || force_pt) { | |
c66ac9db NB |
1980 | alua->alua_type = SPC_ALUA_PASSTHROUGH; |
1981 | alua->alua_state_check = &core_alua_state_check_nop; | |
6708bb27 | 1982 | pr_debug("%s: Using SPC_ALUA_PASSTHROUGH, no ALUA" |
e3d6f909 | 1983 | " emulation\n", dev->transport->name); |
c66ac9db NB |
1984 | return 0; |
1985 | } | |
1986 | /* | |
1987 | * If SPC-3 or above is reported by real or emulated struct se_device, | |
1988 | * use emulated ALUA. | |
1989 | */ | |
e3d6f909 | 1990 | if (dev->transport->get_device_rev(dev) >= SCSI_3) { |
6708bb27 | 1991 | pr_debug("%s: Enabling ALUA Emulation for SPC-3" |
e3d6f909 | 1992 | " device\n", dev->transport->name); |
c66ac9db | 1993 | /* |
25985edc | 1994 | * Associate this struct se_device with the default ALUA |
c66ac9db NB |
1995 | * LUN Group. |
1996 | */ | |
1997 | lu_gp_mem = core_alua_allocate_lu_gp_mem(dev); | |
e3d6f909 AG |
1998 | if (IS_ERR(lu_gp_mem)) |
1999 | return PTR_ERR(lu_gp_mem); | |
c66ac9db NB |
2000 | |
2001 | alua->alua_type = SPC3_ALUA_EMULATED; | |
2002 | alua->alua_state_check = &core_alua_state_check; | |
2003 | spin_lock(&lu_gp_mem->lu_gp_mem_lock); | |
2004 | __core_alua_attach_lu_gp_mem(lu_gp_mem, | |
e3d6f909 | 2005 | default_lu_gp); |
c66ac9db NB |
2006 | spin_unlock(&lu_gp_mem->lu_gp_mem_lock); |
2007 | ||
6708bb27 | 2008 | pr_debug("%s: Adding to default ALUA LU Group:" |
c66ac9db | 2009 | " core/alua/lu_gps/default_lu_gp\n", |
e3d6f909 | 2010 | dev->transport->name); |
c66ac9db NB |
2011 | } else { |
2012 | alua->alua_type = SPC2_ALUA_DISABLED; | |
2013 | alua->alua_state_check = &core_alua_state_check_nop; | |
6708bb27 | 2014 | pr_debug("%s: Disabling ALUA Emulation for SPC-2" |
e3d6f909 | 2015 | " device\n", dev->transport->name); |
c66ac9db NB |
2016 | } |
2017 | ||
2018 | return 0; | |
2019 | } |