1 /*******************************************************************************
2 * Filename: target_core_alua.c
3 *
4 * This file contains SPC-3 compliant asymmetric logical unit assigntment (ALUA)
5 *
6 * (c) Copyright 2009-2012 RisingTide Systems LLC.
7 *
8 * Nicholas A. Bellinger <nab@kernel.org>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
23 *
24 ******************************************************************************/
25
26 #include <linux/slab.h>
27 #include <linux/spinlock.h>
28 #include <linux/configfs.h>
29 #include <linux/export.h>
30 #include <linux/file.h>
31 #include <scsi/scsi.h>
32 #include <scsi/scsi_cmnd.h>
33 #include <asm/unaligned.h>
34
35 #include <target/target_core_base.h>
36 #include <target/target_core_backend.h>
37 #include <target/target_core_fabric.h>
38 #include <target/target_core_configfs.h>
39
40 #include "target_core_internal.h"
41 #include "target_core_alua.h"
42 #include "target_core_ua.h"
43
44 static sense_reason_t 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
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
57 /*
58 * REPORT_TARGET_PORT_GROUPS
59 *
60 * See spc4r17 section 6.27
61 */
62 sense_reason_t
target_emulate_report_target_port_groups(struct se_cmd * cmd)63 target_emulate_report_target_port_groups(struct se_cmd *cmd)
64 {
65 struct se_device *dev = cmd->se_dev;
66 struct se_port *port;
67 struct t10_alua_tg_pt_gp *tg_pt_gp;
68 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
69 unsigned char *buf;
70 u32 rd_len = 0, off;
71 int ext_hdr = (cmd->t_task_cdb[1] & 0x20);
72
73 /*
74 * Skip over RESERVED area to first Target port group descriptor
75 * depending on the PARAMETER DATA FORMAT type..
76 */
77 if (ext_hdr != 0)
78 off = 8;
79 else
80 off = 4;
81
82 if (cmd->data_length < off) {
83 pr_warn("REPORT TARGET PORT GROUPS allocation length %u too"
84 " small for %s header\n", cmd->data_length,
85 (ext_hdr) ? "extended" : "normal");
86 return TCM_INVALID_CDB_FIELD;
87 }
88 buf = transport_kmap_data_sg(cmd);
89 if (!buf)
90 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
91
92 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
93 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
94 tg_pt_gp_list) {
95 /*
96 * Check if the Target port group and Target port descriptor list
97 * based on tg_pt_gp_members count will fit into the response payload.
98 * Otherwise, bump rd_len to let the initiator know we have exceeded
99 * the allocation length and the response is truncated.
100 */
101 if ((off + 8 + (tg_pt_gp->tg_pt_gp_members * 4)) >
102 cmd->data_length) {
103 rd_len += 8 + (tg_pt_gp->tg_pt_gp_members * 4);
104 continue;
105 }
106 /*
107 * PREF: Preferred target port bit, determine if this
108 * bit should be set for port group.
109 */
110 if (tg_pt_gp->tg_pt_gp_pref)
111 buf[off] = 0x80;
112 /*
113 * Set the ASYMMETRIC ACCESS State
114 */
115 buf[off++] |= (atomic_read(
116 &tg_pt_gp->tg_pt_gp_alua_access_state) & 0xff);
117 /*
118 * Set supported ASYMMETRIC ACCESS State bits
119 */
120 buf[off] = 0x80; /* T_SUP */
121 buf[off] |= 0x40; /* O_SUP */
122 buf[off] |= 0x8; /* U_SUP */
123 buf[off] |= 0x4; /* S_SUP */
124 buf[off] |= 0x2; /* AN_SUP */
125 buf[off++] |= 0x1; /* AO_SUP */
126 /*
127 * TARGET PORT GROUP
128 */
129 buf[off++] = ((tg_pt_gp->tg_pt_gp_id >> 8) & 0xff);
130 buf[off++] = (tg_pt_gp->tg_pt_gp_id & 0xff);
131
132 off++; /* Skip over Reserved */
133 /*
134 * STATUS CODE
135 */
136 buf[off++] = (tg_pt_gp->tg_pt_gp_alua_access_status & 0xff);
137 /*
138 * Vendor Specific field
139 */
140 buf[off++] = 0x00;
141 /*
142 * TARGET PORT COUNT
143 */
144 buf[off++] = (tg_pt_gp->tg_pt_gp_members & 0xff);
145 rd_len += 8;
146
147 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
148 list_for_each_entry(tg_pt_gp_mem, &tg_pt_gp->tg_pt_gp_mem_list,
149 tg_pt_gp_mem_list) {
150 port = tg_pt_gp_mem->tg_pt;
151 /*
152 * Start Target Port descriptor format
153 *
154 * See spc4r17 section 6.2.7 Table 247
155 */
156 off += 2; /* Skip over Obsolete */
157 /*
158 * Set RELATIVE TARGET PORT IDENTIFIER
159 */
160 buf[off++] = ((port->sep_rtpi >> 8) & 0xff);
161 buf[off++] = (port->sep_rtpi & 0xff);
162 rd_len += 4;
163 }
164 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
165 }
166 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
167 /*
168 * Set the RETURN DATA LENGTH set in the header of the DataIN Payload
169 */
170 put_unaligned_be32(rd_len, &buf[0]);
171
172 /*
173 * Fill in the Extended header parameter data format if requested
174 */
175 if (ext_hdr != 0) {
176 buf[4] = 0x10;
177 /*
178 * Set the implict transition time (in seconds) for the application
179 * client to use as a base for it's transition timeout value.
180 *
181 * Use the current tg_pt_gp_mem -> tg_pt_gp membership from the LUN
182 * this CDB was received upon to determine this value individually
183 * for ALUA target port group.
184 */
185 port = cmd->se_lun->lun_sep;
186 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
187 if (tg_pt_gp_mem) {
188 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
189 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
190 if (tg_pt_gp)
191 buf[5] = tg_pt_gp->tg_pt_gp_implict_trans_secs;
192 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
193 }
194 }
195 transport_kunmap_data_sg(cmd);
196
197 target_complete_cmd(cmd, GOOD);
198 return 0;
199 }
200
201 /*
202 * SET_TARGET_PORT_GROUPS for explict ALUA operation.
203 *
204 * See spc4r17 section 6.35
205 */
206 sense_reason_t
target_emulate_set_target_port_groups(struct se_cmd * cmd)207 target_emulate_set_target_port_groups(struct se_cmd *cmd)
208 {
209 struct se_device *dev = cmd->se_dev;
210 struct se_port *port, *l_port = cmd->se_lun->lun_sep;
211 struct se_node_acl *nacl = cmd->se_sess->se_node_acl;
212 struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *l_tg_pt_gp;
213 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *l_tg_pt_gp_mem;
214 unsigned char *buf;
215 unsigned char *ptr;
216 sense_reason_t rc = TCM_NO_SENSE;
217 u32 len = 4; /* Skip over RESERVED area in header */
218 int alua_access_state, primary = 0;
219 u16 tg_pt_id, rtpi;
220
221 if (!l_port)
222 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
223
224 if (cmd->data_length < 4) {
225 pr_warn("SET TARGET PORT GROUPS parameter list length %u too"
226 " small\n", cmd->data_length);
227 return TCM_INVALID_PARAMETER_LIST;
228 }
229
230 buf = transport_kmap_data_sg(cmd);
231 if (!buf)
232 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
233
234 /*
235 * Determine if explict ALUA via SET_TARGET_PORT_GROUPS is allowed
236 * for the local tg_pt_gp.
237 */
238 l_tg_pt_gp_mem = l_port->sep_alua_tg_pt_gp_mem;
239 if (!l_tg_pt_gp_mem) {
240 pr_err("Unable to access l_port->sep_alua_tg_pt_gp_mem\n");
241 rc = TCM_UNSUPPORTED_SCSI_OPCODE;
242 goto out;
243 }
244 spin_lock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock);
245 l_tg_pt_gp = l_tg_pt_gp_mem->tg_pt_gp;
246 if (!l_tg_pt_gp) {
247 spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock);
248 pr_err("Unable to access *l_tg_pt_gp_mem->tg_pt_gp\n");
249 rc = TCM_UNSUPPORTED_SCSI_OPCODE;
250 goto out;
251 }
252 spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock);
253
254 if (!(l_tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA)) {
255 pr_debug("Unable to process SET_TARGET_PORT_GROUPS"
256 " while TPGS_EXPLICT_ALUA is disabled\n");
257 rc = TCM_UNSUPPORTED_SCSI_OPCODE;
258 goto out;
259 }
260
261 ptr = &buf[4]; /* Skip over RESERVED area in header */
262
263 while (len < cmd->data_length) {
264 bool found = false;
265 alua_access_state = (ptr[0] & 0x0f);
266 /*
267 * Check the received ALUA access state, and determine if
268 * the state is a primary or secondary target port asymmetric
269 * access state.
270 */
271 rc = core_alua_check_transition(alua_access_state, &primary);
272 if (rc) {
273 /*
274 * If the SET TARGET PORT GROUPS attempts to establish
275 * an invalid combination of target port asymmetric
276 * access states or attempts to establish an
277 * unsupported target port asymmetric access state,
278 * then the command shall be terminated with CHECK
279 * CONDITION status, with the sense key set to ILLEGAL
280 * REQUEST, and the additional sense code set to INVALID
281 * FIELD IN PARAMETER LIST.
282 */
283 goto out;
284 }
285
286 /*
287 * If the ASYMMETRIC ACCESS STATE field (see table 267)
288 * specifies a primary target port asymmetric access state,
289 * then the TARGET PORT GROUP OR TARGET PORT field specifies
290 * a primary target port group for which the primary target
291 * port asymmetric access state shall be changed. If the
292 * ASYMMETRIC ACCESS STATE field specifies a secondary target
293 * port asymmetric access state, then the TARGET PORT GROUP OR
294 * TARGET PORT field specifies the relative target port
295 * identifier (see 3.1.120) of the target port for which the
296 * secondary target port asymmetric access state shall be
297 * changed.
298 */
299 if (primary) {
300 tg_pt_id = get_unaligned_be16(ptr + 2);
301 /*
302 * Locate the matching target port group ID from
303 * the global tg_pt_gp list
304 */
305 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
306 list_for_each_entry(tg_pt_gp,
307 &dev->t10_alua.tg_pt_gps_list,
308 tg_pt_gp_list) {
309 if (!tg_pt_gp->tg_pt_gp_valid_id)
310 continue;
311
312 if (tg_pt_id != tg_pt_gp->tg_pt_gp_id)
313 continue;
314
315 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
316 smp_mb__after_atomic_inc();
317
318 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
319
320 if (!core_alua_do_port_transition(tg_pt_gp,
321 dev, l_port, nacl,
322 alua_access_state, 1))
323 found = true;
324
325 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
326 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
327 smp_mb__after_atomic_dec();
328 break;
329 }
330 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
331 } else {
332 /*
333 * Extact the RELATIVE TARGET PORT IDENTIFIER to identify
334 * the Target Port in question for the the incoming
335 * SET_TARGET_PORT_GROUPS op.
336 */
337 rtpi = get_unaligned_be16(ptr + 2);
338 /*
339 * Locate the matching relative target port identifier
340 * for the struct se_device storage object.
341 */
342 spin_lock(&dev->se_port_lock);
343 list_for_each_entry(port, &dev->dev_sep_list,
344 sep_list) {
345 if (port->sep_rtpi != rtpi)
346 continue;
347
348 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
349
350 spin_unlock(&dev->se_port_lock);
351
352 if (!core_alua_set_tg_pt_secondary_state(
353 tg_pt_gp_mem, port, 1, 1))
354 found = true;
355
356 spin_lock(&dev->se_port_lock);
357 break;
358 }
359 spin_unlock(&dev->se_port_lock);
360 }
361
362 if (!found) {
363 rc = TCM_INVALID_PARAMETER_LIST;
364 goto out;
365 }
366
367 ptr += 4;
368 len += 4;
369 }
370
371 out:
372 transport_kunmap_data_sg(cmd);
373 if (!rc)
374 target_complete_cmd(cmd, GOOD);
375 return rc;
376 }
377
core_alua_state_nonoptimized(struct se_cmd * cmd,unsigned char * cdb,int nonop_delay_msecs,u8 * alua_ascq)378 static inline int core_alua_state_nonoptimized(
379 struct se_cmd *cmd,
380 unsigned char *cdb,
381 int nonop_delay_msecs,
382 u8 *alua_ascq)
383 {
384 /*
385 * Set SCF_ALUA_NON_OPTIMIZED here, this value will be checked
386 * later to determine if processing of this cmd needs to be
387 * temporarily delayed for the Active/NonOptimized primary access state.
388 */
389 cmd->se_cmd_flags |= SCF_ALUA_NON_OPTIMIZED;
390 cmd->alua_nonop_delay = nonop_delay_msecs;
391 return 0;
392 }
393
core_alua_state_standby(struct se_cmd * cmd,unsigned char * cdb,u8 * alua_ascq)394 static inline int core_alua_state_standby(
395 struct se_cmd *cmd,
396 unsigned char *cdb,
397 u8 *alua_ascq)
398 {
399 /*
400 * Allowed CDBs for ALUA_ACCESS_STATE_STANDBY as defined by
401 * spc4r17 section 5.9.2.4.4
402 */
403 switch (cdb[0]) {
404 case INQUIRY:
405 case LOG_SELECT:
406 case LOG_SENSE:
407 case MODE_SELECT:
408 case MODE_SENSE:
409 case REPORT_LUNS:
410 case RECEIVE_DIAGNOSTIC:
411 case SEND_DIAGNOSTIC:
412 return 0;
413 case MAINTENANCE_IN:
414 switch (cdb[1] & 0x1f) {
415 case MI_REPORT_TARGET_PGS:
416 return 0;
417 default:
418 *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY;
419 return 1;
420 }
421 case MAINTENANCE_OUT:
422 switch (cdb[1]) {
423 case MO_SET_TARGET_PGS:
424 return 0;
425 default:
426 *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY;
427 return 1;
428 }
429 case REQUEST_SENSE:
430 case PERSISTENT_RESERVE_IN:
431 case PERSISTENT_RESERVE_OUT:
432 case READ_BUFFER:
433 case WRITE_BUFFER:
434 return 0;
435 default:
436 *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY;
437 return 1;
438 }
439
440 return 0;
441 }
442
core_alua_state_unavailable(struct se_cmd * cmd,unsigned char * cdb,u8 * alua_ascq)443 static inline int core_alua_state_unavailable(
444 struct se_cmd *cmd,
445 unsigned char *cdb,
446 u8 *alua_ascq)
447 {
448 /*
449 * Allowed CDBs for ALUA_ACCESS_STATE_UNAVAILABLE as defined by
450 * spc4r17 section 5.9.2.4.5
451 */
452 switch (cdb[0]) {
453 case INQUIRY:
454 case REPORT_LUNS:
455 return 0;
456 case MAINTENANCE_IN:
457 switch (cdb[1] & 0x1f) {
458 case MI_REPORT_TARGET_PGS:
459 return 0;
460 default:
461 *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE;
462 return 1;
463 }
464 case MAINTENANCE_OUT:
465 switch (cdb[1]) {
466 case MO_SET_TARGET_PGS:
467 return 0;
468 default:
469 *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE;
470 return 1;
471 }
472 case REQUEST_SENSE:
473 case READ_BUFFER:
474 case WRITE_BUFFER:
475 return 0;
476 default:
477 *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE;
478 return 1;
479 }
480
481 return 0;
482 }
483
core_alua_state_transition(struct se_cmd * cmd,unsigned char * cdb,u8 * alua_ascq)484 static inline int core_alua_state_transition(
485 struct se_cmd *cmd,
486 unsigned char *cdb,
487 u8 *alua_ascq)
488 {
489 /*
490 * Allowed CDBs for ALUA_ACCESS_STATE_TRANSITIO as defined by
491 * spc4r17 section 5.9.2.5
492 */
493 switch (cdb[0]) {
494 case INQUIRY:
495 case REPORT_LUNS:
496 return 0;
497 case MAINTENANCE_IN:
498 switch (cdb[1] & 0x1f) {
499 case MI_REPORT_TARGET_PGS:
500 return 0;
501 default:
502 *alua_ascq = ASCQ_04H_ALUA_STATE_TRANSITION;
503 return 1;
504 }
505 case REQUEST_SENSE:
506 case READ_BUFFER:
507 case WRITE_BUFFER:
508 return 0;
509 default:
510 *alua_ascq = ASCQ_04H_ALUA_STATE_TRANSITION;
511 return 1;
512 }
513
514 return 0;
515 }
516
517 /*
518 * return 1: Is used to signal LUN not accecsable, and check condition/not ready
519 * return 0: Used to signal success
520 * reutrn -1: Used to signal failure, and invalid cdb field
521 */
522 sense_reason_t
target_alua_state_check(struct se_cmd * cmd)523 target_alua_state_check(struct se_cmd *cmd)
524 {
525 struct se_device *dev = cmd->se_dev;
526 unsigned char *cdb = cmd->t_task_cdb;
527 struct se_lun *lun = cmd->se_lun;
528 struct se_port *port = lun->lun_sep;
529 struct t10_alua_tg_pt_gp *tg_pt_gp;
530 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
531 int out_alua_state, nonop_delay_msecs;
532 u8 alua_ascq;
533 int ret;
534
535 if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)
536 return 0;
537 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
538 return 0;
539
540 if (!port)
541 return 0;
542 /*
543 * First, check for a struct se_port specific secondary ALUA target port
544 * access state: OFFLINE
545 */
546 if (atomic_read(&port->sep_tg_pt_secondary_offline)) {
547 pr_debug("ALUA: Got secondary offline status for local"
548 " target port\n");
549 alua_ascq = ASCQ_04H_ALUA_OFFLINE;
550 ret = 1;
551 goto out;
552 }
553 /*
554 * Second, obtain the struct t10_alua_tg_pt_gp_member pointer to the
555 * ALUA target port group, to obtain current ALUA access state.
556 * Otherwise look for the underlying struct se_device association with
557 * a ALUA logical unit group.
558 */
559 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
560 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
561 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
562 out_alua_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state);
563 nonop_delay_msecs = tg_pt_gp->tg_pt_gp_nonop_delay_msecs;
564 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
565 /*
566 * Process ALUA_ACCESS_STATE_ACTIVE_OPTMIZED in a separate conditional
567 * statement so the compiler knows explicitly to check this case first.
568 * For the Optimized ALUA access state case, we want to process the
569 * incoming fabric cmd ASAP..
570 */
571 if (out_alua_state == ALUA_ACCESS_STATE_ACTIVE_OPTMIZED)
572 return 0;
573
574 switch (out_alua_state) {
575 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
576 ret = core_alua_state_nonoptimized(cmd, cdb,
577 nonop_delay_msecs, &alua_ascq);
578 break;
579 case ALUA_ACCESS_STATE_STANDBY:
580 ret = core_alua_state_standby(cmd, cdb, &alua_ascq);
581 break;
582 case ALUA_ACCESS_STATE_UNAVAILABLE:
583 ret = core_alua_state_unavailable(cmd, cdb, &alua_ascq);
584 break;
585 case ALUA_ACCESS_STATE_TRANSITION:
586 ret = core_alua_state_transition(cmd, cdb, &alua_ascq);
587 break;
588 /*
589 * OFFLINE is a secondary ALUA target port group access state, that is
590 * handled above with struct se_port->sep_tg_pt_secondary_offline=1
591 */
592 case ALUA_ACCESS_STATE_OFFLINE:
593 default:
594 pr_err("Unknown ALUA access state: 0x%02x\n",
595 out_alua_state);
596 return TCM_INVALID_CDB_FIELD;
597 }
598
599 out:
600 if (ret > 0) {
601 /*
602 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
603 * The ALUA additional sense code qualifier (ASCQ) is determined
604 * by the ALUA primary or secondary access state..
605 */
606 pr_debug("[%s]: ALUA TG Port not available, "
607 "SenseKey: NOT_READY, ASC/ASCQ: "
608 "0x04/0x%02x\n",
609 cmd->se_tfo->get_fabric_name(), alua_ascq);
610
611 cmd->scsi_asc = 0x04;
612 cmd->scsi_ascq = alua_ascq;
613 return TCM_CHECK_CONDITION_NOT_READY;
614 }
615
616 return 0;
617 }
618
619 /*
620 * Check implict and explict ALUA state change request.
621 */
622 static sense_reason_t
core_alua_check_transition(int state,int * primary)623 core_alua_check_transition(int state, int *primary)
624 {
625 switch (state) {
626 case ALUA_ACCESS_STATE_ACTIVE_OPTMIZED:
627 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
628 case ALUA_ACCESS_STATE_STANDBY:
629 case ALUA_ACCESS_STATE_UNAVAILABLE:
630 /*
631 * OPTIMIZED, NON-OPTIMIZED, STANDBY and UNAVAILABLE are
632 * defined as primary target port asymmetric access states.
633 */
634 *primary = 1;
635 break;
636 case ALUA_ACCESS_STATE_OFFLINE:
637 /*
638 * OFFLINE state is defined as a secondary target port
639 * asymmetric access state.
640 */
641 *primary = 0;
642 break;
643 default:
644 pr_err("Unknown ALUA access state: 0x%02x\n", state);
645 return TCM_INVALID_PARAMETER_LIST;
646 }
647
648 return 0;
649 }
650
core_alua_dump_state(int state)651 static char *core_alua_dump_state(int state)
652 {
653 switch (state) {
654 case ALUA_ACCESS_STATE_ACTIVE_OPTMIZED:
655 return "Active/Optimized";
656 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
657 return "Active/NonOptimized";
658 case ALUA_ACCESS_STATE_STANDBY:
659 return "Standby";
660 case ALUA_ACCESS_STATE_UNAVAILABLE:
661 return "Unavailable";
662 case ALUA_ACCESS_STATE_OFFLINE:
663 return "Offline";
664 default:
665 return "Unknown";
666 }
667
668 return NULL;
669 }
670
core_alua_dump_status(int status)671 char *core_alua_dump_status(int status)
672 {
673 switch (status) {
674 case ALUA_STATUS_NONE:
675 return "None";
676 case ALUA_STATUS_ALTERED_BY_EXPLICT_STPG:
677 return "Altered by Explict STPG";
678 case ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA:
679 return "Altered by Implict ALUA";
680 default:
681 return "Unknown";
682 }
683
684 return NULL;
685 }
686
687 /*
688 * Used by fabric modules to determine when we need to delay processing
689 * for the Active/NonOptimized paths..
690 */
core_alua_check_nonop_delay(struct se_cmd * cmd)691 int core_alua_check_nonop_delay(
692 struct se_cmd *cmd)
693 {
694 if (!(cmd->se_cmd_flags & SCF_ALUA_NON_OPTIMIZED))
695 return 0;
696 if (in_interrupt())
697 return 0;
698 /*
699 * The ALUA Active/NonOptimized access state delay can be disabled
700 * in via configfs with a value of zero
701 */
702 if (!cmd->alua_nonop_delay)
703 return 0;
704 /*
705 * struct se_cmd->alua_nonop_delay gets set by a target port group
706 * defined interval in core_alua_state_nonoptimized()
707 */
708 msleep_interruptible(cmd->alua_nonop_delay);
709 return 0;
710 }
711 EXPORT_SYMBOL(core_alua_check_nonop_delay);
712
713 /*
714 * Called with tg_pt_gp->tg_pt_gp_md_mutex or tg_pt_gp_mem->sep_tg_pt_md_mutex
715 *
716 */
core_alua_write_tpg_metadata(const char * path,unsigned char * md_buf,u32 md_buf_len)717 static int core_alua_write_tpg_metadata(
718 const char *path,
719 unsigned char *md_buf,
720 u32 md_buf_len)
721 {
722 struct file *file = filp_open(path, O_RDWR | O_CREAT | O_TRUNC, 0600);
723 int ret;
724
725 if (IS_ERR(file)) {
726 pr_err("filp_open(%s) for ALUA metadata failed\n", path);
727 return -ENODEV;
728 }
729 ret = kernel_write(file, md_buf, md_buf_len, 0);
730 if (ret < 0)
731 pr_err("Error writing ALUA metadata file: %s\n", path);
732 fput(file);
733 return ret ? -EIO : 0;
734 }
735
736 /*
737 * Called with tg_pt_gp->tg_pt_gp_md_mutex held
738 */
core_alua_update_tpg_primary_metadata(struct t10_alua_tg_pt_gp * tg_pt_gp,int primary_state,unsigned char * md_buf)739 static int core_alua_update_tpg_primary_metadata(
740 struct t10_alua_tg_pt_gp *tg_pt_gp,
741 int primary_state,
742 unsigned char *md_buf)
743 {
744 struct t10_wwn *wwn = &tg_pt_gp->tg_pt_gp_dev->t10_wwn;
745 char path[ALUA_METADATA_PATH_LEN];
746 int len;
747
748 memset(path, 0, ALUA_METADATA_PATH_LEN);
749
750 len = snprintf(md_buf, tg_pt_gp->tg_pt_gp_md_buf_len,
751 "tg_pt_gp_id=%hu\n"
752 "alua_access_state=0x%02x\n"
753 "alua_access_status=0x%02x\n",
754 tg_pt_gp->tg_pt_gp_id, primary_state,
755 tg_pt_gp->tg_pt_gp_alua_access_status);
756
757 snprintf(path, ALUA_METADATA_PATH_LEN,
758 "/var/target/alua/tpgs_%s/%s", &wwn->unit_serial[0],
759 config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item));
760
761 return core_alua_write_tpg_metadata(path, md_buf, len);
762 }
763
core_alua_do_transition_tg_pt(struct t10_alua_tg_pt_gp * tg_pt_gp,struct se_port * l_port,struct se_node_acl * nacl,unsigned char * md_buf,int new_state,int explict)764 static int core_alua_do_transition_tg_pt(
765 struct t10_alua_tg_pt_gp *tg_pt_gp,
766 struct se_port *l_port,
767 struct se_node_acl *nacl,
768 unsigned char *md_buf,
769 int new_state,
770 int explict)
771 {
772 struct se_dev_entry *se_deve;
773 struct se_lun_acl *lacl;
774 struct se_port *port;
775 struct t10_alua_tg_pt_gp_member *mem;
776 int old_state = 0;
777 /*
778 * Save the old primary ALUA access state, and set the current state
779 * to ALUA_ACCESS_STATE_TRANSITION.
780 */
781 old_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state);
782 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
783 ALUA_ACCESS_STATE_TRANSITION);
784 tg_pt_gp->tg_pt_gp_alua_access_status = (explict) ?
785 ALUA_STATUS_ALTERED_BY_EXPLICT_STPG :
786 ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA;
787 /*
788 * Check for the optional ALUA primary state transition delay
789 */
790 if (tg_pt_gp->tg_pt_gp_trans_delay_msecs != 0)
791 msleep_interruptible(tg_pt_gp->tg_pt_gp_trans_delay_msecs);
792
793 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
794 list_for_each_entry(mem, &tg_pt_gp->tg_pt_gp_mem_list,
795 tg_pt_gp_mem_list) {
796 port = mem->tg_pt;
797 /*
798 * After an implicit target port asymmetric access state
799 * change, a device server shall establish a unit attention
800 * condition for the initiator port associated with every I_T
801 * nexus with the additional sense code set to ASYMMETRIC
802 * ACCESS STATE CHAGED.
803 *
804 * After an explicit target port asymmetric access state
805 * change, a device server shall establish a unit attention
806 * condition with the additional sense code set to ASYMMETRIC
807 * ACCESS STATE CHANGED for the initiator port associated with
808 * every I_T nexus other than the I_T nexus on which the SET
809 * TARGET PORT GROUPS command
810 */
811 atomic_inc(&mem->tg_pt_gp_mem_ref_cnt);
812 smp_mb__after_atomic_inc();
813 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
814
815 spin_lock_bh(&port->sep_alua_lock);
816 list_for_each_entry(se_deve, &port->sep_alua_list,
817 alua_port_list) {
818 lacl = se_deve->se_lun_acl;
819 /*
820 * se_deve->se_lun_acl pointer may be NULL for a
821 * entry created without explict Node+MappedLUN ACLs
822 */
823 if (!lacl)
824 continue;
825
826 if (explict &&
827 (nacl != NULL) && (nacl == lacl->se_lun_nacl) &&
828 (l_port != NULL) && (l_port == port))
829 continue;
830
831 core_scsi3_ua_allocate(lacl->se_lun_nacl,
832 se_deve->mapped_lun, 0x2A,
833 ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED);
834 }
835 spin_unlock_bh(&port->sep_alua_lock);
836
837 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
838 atomic_dec(&mem->tg_pt_gp_mem_ref_cnt);
839 smp_mb__after_atomic_dec();
840 }
841 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
842 /*
843 * Update the ALUA metadata buf that has been allocated in
844 * core_alua_do_port_transition(), this metadata will be written
845 * to struct file.
846 *
847 * Note that there is the case where we do not want to update the
848 * metadata when the saved metadata is being parsed in userspace
849 * when setting the existing port access state and access status.
850 *
851 * Also note that the failure to write out the ALUA metadata to
852 * struct file does NOT affect the actual ALUA transition.
853 */
854 if (tg_pt_gp->tg_pt_gp_write_metadata) {
855 mutex_lock(&tg_pt_gp->tg_pt_gp_md_mutex);
856 core_alua_update_tpg_primary_metadata(tg_pt_gp,
857 new_state, md_buf);
858 mutex_unlock(&tg_pt_gp->tg_pt_gp_md_mutex);
859 }
860 /*
861 * Set the current primary ALUA access state to the requested new state
862 */
863 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, new_state);
864
865 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
866 " from primary access state %s to %s\n", (explict) ? "explict" :
867 "implict", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
868 tg_pt_gp->tg_pt_gp_id, core_alua_dump_state(old_state),
869 core_alua_dump_state(new_state));
870
871 return 0;
872 }
873
core_alua_do_port_transition(struct t10_alua_tg_pt_gp * l_tg_pt_gp,struct se_device * l_dev,struct se_port * l_port,struct se_node_acl * l_nacl,int new_state,int explict)874 int core_alua_do_port_transition(
875 struct t10_alua_tg_pt_gp *l_tg_pt_gp,
876 struct se_device *l_dev,
877 struct se_port *l_port,
878 struct se_node_acl *l_nacl,
879 int new_state,
880 int explict)
881 {
882 struct se_device *dev;
883 struct se_port *port;
884 struct se_node_acl *nacl;
885 struct t10_alua_lu_gp *lu_gp;
886 struct t10_alua_lu_gp_member *lu_gp_mem, *local_lu_gp_mem;
887 struct t10_alua_tg_pt_gp *tg_pt_gp;
888 unsigned char *md_buf;
889 int primary;
890
891 if (core_alua_check_transition(new_state, &primary) != 0)
892 return -EINVAL;
893
894 md_buf = kzalloc(l_tg_pt_gp->tg_pt_gp_md_buf_len, GFP_KERNEL);
895 if (!md_buf) {
896 pr_err("Unable to allocate buf for ALUA metadata\n");
897 return -ENOMEM;
898 }
899
900 local_lu_gp_mem = l_dev->dev_alua_lu_gp_mem;
901 spin_lock(&local_lu_gp_mem->lu_gp_mem_lock);
902 lu_gp = local_lu_gp_mem->lu_gp;
903 atomic_inc(&lu_gp->lu_gp_ref_cnt);
904 smp_mb__after_atomic_inc();
905 spin_unlock(&local_lu_gp_mem->lu_gp_mem_lock);
906 /*
907 * For storage objects that are members of the 'default_lu_gp',
908 * we only do transition on the passed *l_tp_pt_gp, and not
909 * on all of the matching target port groups IDs in default_lu_gp.
910 */
911 if (!lu_gp->lu_gp_id) {
912 /*
913 * core_alua_do_transition_tg_pt() will always return
914 * success.
915 */
916 core_alua_do_transition_tg_pt(l_tg_pt_gp, l_port, l_nacl,
917 md_buf, new_state, explict);
918 atomic_dec(&lu_gp->lu_gp_ref_cnt);
919 smp_mb__after_atomic_dec();
920 kfree(md_buf);
921 return 0;
922 }
923 /*
924 * For all other LU groups aside from 'default_lu_gp', walk all of
925 * the associated storage objects looking for a matching target port
926 * group ID from the local target port group.
927 */
928 spin_lock(&lu_gp->lu_gp_lock);
929 list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list,
930 lu_gp_mem_list) {
931
932 dev = lu_gp_mem->lu_gp_mem_dev;
933 atomic_inc(&lu_gp_mem->lu_gp_mem_ref_cnt);
934 smp_mb__after_atomic_inc();
935 spin_unlock(&lu_gp->lu_gp_lock);
936
937 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
938 list_for_each_entry(tg_pt_gp,
939 &dev->t10_alua.tg_pt_gps_list,
940 tg_pt_gp_list) {
941
942 if (!tg_pt_gp->tg_pt_gp_valid_id)
943 continue;
944 /*
945 * If the target behavior port asymmetric access state
946 * is changed for any target port group accessiable via
947 * a logical unit within a LU group, the target port
948 * behavior group asymmetric access states for the same
949 * target port group accessible via other logical units
950 * in that LU group will also change.
951 */
952 if (l_tg_pt_gp->tg_pt_gp_id != tg_pt_gp->tg_pt_gp_id)
953 continue;
954
955 if (l_tg_pt_gp == tg_pt_gp) {
956 port = l_port;
957 nacl = l_nacl;
958 } else {
959 port = NULL;
960 nacl = NULL;
961 }
962 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
963 smp_mb__after_atomic_inc();
964 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
965 /*
966 * core_alua_do_transition_tg_pt() will always return
967 * success.
968 */
969 core_alua_do_transition_tg_pt(tg_pt_gp, port,
970 nacl, md_buf, new_state, explict);
971
972 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
973 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
974 smp_mb__after_atomic_dec();
975 }
976 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
977
978 spin_lock(&lu_gp->lu_gp_lock);
979 atomic_dec(&lu_gp_mem->lu_gp_mem_ref_cnt);
980 smp_mb__after_atomic_dec();
981 }
982 spin_unlock(&lu_gp->lu_gp_lock);
983
984 pr_debug("Successfully processed LU Group: %s all ALUA TG PT"
985 " Group IDs: %hu %s transition to primary state: %s\n",
986 config_item_name(&lu_gp->lu_gp_group.cg_item),
987 l_tg_pt_gp->tg_pt_gp_id, (explict) ? "explict" : "implict",
988 core_alua_dump_state(new_state));
989
990 atomic_dec(&lu_gp->lu_gp_ref_cnt);
991 smp_mb__after_atomic_dec();
992 kfree(md_buf);
993 return 0;
994 }
995
996 /*
997 * Called with tg_pt_gp_mem->sep_tg_pt_md_mutex held
998 */
core_alua_update_tpg_secondary_metadata(struct t10_alua_tg_pt_gp_member * tg_pt_gp_mem,struct se_port * port,unsigned char * md_buf,u32 md_buf_len)999 static int core_alua_update_tpg_secondary_metadata(
1000 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
1001 struct se_port *port,
1002 unsigned char *md_buf,
1003 u32 md_buf_len)
1004 {
1005 struct se_portal_group *se_tpg = port->sep_tpg;
1006 char path[ALUA_METADATA_PATH_LEN], wwn[ALUA_SECONDARY_METADATA_WWN_LEN];
1007 int len;
1008
1009 memset(path, 0, ALUA_METADATA_PATH_LEN);
1010 memset(wwn, 0, ALUA_SECONDARY_METADATA_WWN_LEN);
1011
1012 len = snprintf(wwn, ALUA_SECONDARY_METADATA_WWN_LEN, "%s",
1013 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg));
1014
1015 if (se_tpg->se_tpg_tfo->tpg_get_tag != NULL)
1016 snprintf(wwn+len, ALUA_SECONDARY_METADATA_WWN_LEN-len, "+%hu",
1017 se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg));
1018
1019 len = snprintf(md_buf, md_buf_len, "alua_tg_pt_offline=%d\n"
1020 "alua_tg_pt_status=0x%02x\n",
1021 atomic_read(&port->sep_tg_pt_secondary_offline),
1022 port->sep_tg_pt_secondary_stat);
1023
1024 snprintf(path, ALUA_METADATA_PATH_LEN, "/var/target/alua/%s/%s/lun_%u",
1025 se_tpg->se_tpg_tfo->get_fabric_name(), wwn,
1026 port->sep_lun->unpacked_lun);
1027
1028 return core_alua_write_tpg_metadata(path, md_buf, len);
1029 }
1030
core_alua_set_tg_pt_secondary_state(struct t10_alua_tg_pt_gp_member * tg_pt_gp_mem,struct se_port * port,int explict,int offline)1031 static int core_alua_set_tg_pt_secondary_state(
1032 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
1033 struct se_port *port,
1034 int explict,
1035 int offline)
1036 {
1037 struct t10_alua_tg_pt_gp *tg_pt_gp;
1038 unsigned char *md_buf;
1039 u32 md_buf_len;
1040 int trans_delay_msecs;
1041
1042 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1043 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
1044 if (!tg_pt_gp) {
1045 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1046 pr_err("Unable to complete secondary state"
1047 " transition\n");
1048 return -EINVAL;
1049 }
1050 trans_delay_msecs = tg_pt_gp->tg_pt_gp_trans_delay_msecs;
1051 /*
1052 * Set the secondary ALUA target port access state to OFFLINE
1053 * or release the previously secondary state for struct se_port
1054 */
1055 if (offline)
1056 atomic_set(&port->sep_tg_pt_secondary_offline, 1);
1057 else
1058 atomic_set(&port->sep_tg_pt_secondary_offline, 0);
1059
1060 md_buf_len = tg_pt_gp->tg_pt_gp_md_buf_len;
1061 port->sep_tg_pt_secondary_stat = (explict) ?
1062 ALUA_STATUS_ALTERED_BY_EXPLICT_STPG :
1063 ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA;
1064
1065 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
1066 " to secondary access state: %s\n", (explict) ? "explict" :
1067 "implict", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
1068 tg_pt_gp->tg_pt_gp_id, (offline) ? "OFFLINE" : "ONLINE");
1069
1070 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1071 /*
1072 * Do the optional transition delay after we set the secondary
1073 * ALUA access state.
1074 */
1075 if (trans_delay_msecs != 0)
1076 msleep_interruptible(trans_delay_msecs);
1077 /*
1078 * See if we need to update the ALUA fabric port metadata for
1079 * secondary state and status
1080 */
1081 if (port->sep_tg_pt_secondary_write_md) {
1082 md_buf = kzalloc(md_buf_len, GFP_KERNEL);
1083 if (!md_buf) {
1084 pr_err("Unable to allocate md_buf for"
1085 " secondary ALUA access metadata\n");
1086 return -ENOMEM;
1087 }
1088 mutex_lock(&port->sep_tg_pt_md_mutex);
1089 core_alua_update_tpg_secondary_metadata(tg_pt_gp_mem, port,
1090 md_buf, md_buf_len);
1091 mutex_unlock(&port->sep_tg_pt_md_mutex);
1092
1093 kfree(md_buf);
1094 }
1095
1096 return 0;
1097 }
1098
1099 struct t10_alua_lu_gp *
core_alua_allocate_lu_gp(const char * name,int def_group)1100 core_alua_allocate_lu_gp(const char *name, int def_group)
1101 {
1102 struct t10_alua_lu_gp *lu_gp;
1103
1104 lu_gp = kmem_cache_zalloc(t10_alua_lu_gp_cache, GFP_KERNEL);
1105 if (!lu_gp) {
1106 pr_err("Unable to allocate struct t10_alua_lu_gp\n");
1107 return ERR_PTR(-ENOMEM);
1108 }
1109 INIT_LIST_HEAD(&lu_gp->lu_gp_node);
1110 INIT_LIST_HEAD(&lu_gp->lu_gp_mem_list);
1111 spin_lock_init(&lu_gp->lu_gp_lock);
1112 atomic_set(&lu_gp->lu_gp_ref_cnt, 0);
1113
1114 if (def_group) {
1115 lu_gp->lu_gp_id = alua_lu_gps_counter++;
1116 lu_gp->lu_gp_valid_id = 1;
1117 alua_lu_gps_count++;
1118 }
1119
1120 return lu_gp;
1121 }
1122
core_alua_set_lu_gp_id(struct t10_alua_lu_gp * lu_gp,u16 lu_gp_id)1123 int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *lu_gp, u16 lu_gp_id)
1124 {
1125 struct t10_alua_lu_gp *lu_gp_tmp;
1126 u16 lu_gp_id_tmp;
1127 /*
1128 * The lu_gp->lu_gp_id may only be set once..
1129 */
1130 if (lu_gp->lu_gp_valid_id) {
1131 pr_warn("ALUA LU Group already has a valid ID,"
1132 " ignoring request\n");
1133 return -EINVAL;
1134 }
1135
1136 spin_lock(&lu_gps_lock);
1137 if (alua_lu_gps_count == 0x0000ffff) {
1138 pr_err("Maximum ALUA alua_lu_gps_count:"
1139 " 0x0000ffff reached\n");
1140 spin_unlock(&lu_gps_lock);
1141 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
1142 return -ENOSPC;
1143 }
1144 again:
1145 lu_gp_id_tmp = (lu_gp_id != 0) ? lu_gp_id :
1146 alua_lu_gps_counter++;
1147
1148 list_for_each_entry(lu_gp_tmp, &lu_gps_list, lu_gp_node) {
1149 if (lu_gp_tmp->lu_gp_id == lu_gp_id_tmp) {
1150 if (!lu_gp_id)
1151 goto again;
1152
1153 pr_warn("ALUA Logical Unit Group ID: %hu"
1154 " already exists, ignoring request\n",
1155 lu_gp_id);
1156 spin_unlock(&lu_gps_lock);
1157 return -EINVAL;
1158 }
1159 }
1160
1161 lu_gp->lu_gp_id = lu_gp_id_tmp;
1162 lu_gp->lu_gp_valid_id = 1;
1163 list_add_tail(&lu_gp->lu_gp_node, &lu_gps_list);
1164 alua_lu_gps_count++;
1165 spin_unlock(&lu_gps_lock);
1166
1167 return 0;
1168 }
1169
1170 static struct t10_alua_lu_gp_member *
core_alua_allocate_lu_gp_mem(struct se_device * dev)1171 core_alua_allocate_lu_gp_mem(struct se_device *dev)
1172 {
1173 struct t10_alua_lu_gp_member *lu_gp_mem;
1174
1175 lu_gp_mem = kmem_cache_zalloc(t10_alua_lu_gp_mem_cache, GFP_KERNEL);
1176 if (!lu_gp_mem) {
1177 pr_err("Unable to allocate struct t10_alua_lu_gp_member\n");
1178 return ERR_PTR(-ENOMEM);
1179 }
1180 INIT_LIST_HEAD(&lu_gp_mem->lu_gp_mem_list);
1181 spin_lock_init(&lu_gp_mem->lu_gp_mem_lock);
1182 atomic_set(&lu_gp_mem->lu_gp_mem_ref_cnt, 0);
1183
1184 lu_gp_mem->lu_gp_mem_dev = dev;
1185 dev->dev_alua_lu_gp_mem = lu_gp_mem;
1186
1187 return lu_gp_mem;
1188 }
1189
core_alua_free_lu_gp(struct t10_alua_lu_gp * lu_gp)1190 void core_alua_free_lu_gp(struct t10_alua_lu_gp *lu_gp)
1191 {
1192 struct t10_alua_lu_gp_member *lu_gp_mem, *lu_gp_mem_tmp;
1193 /*
1194 * Once we have reached this point, config_item_put() has
1195 * already been called from target_core_alua_drop_lu_gp().
1196 *
1197 * Here, we remove the *lu_gp from the global list so that
1198 * no associations can be made while we are releasing
1199 * struct t10_alua_lu_gp.
1200 */
1201 spin_lock(&lu_gps_lock);
1202 list_del(&lu_gp->lu_gp_node);
1203 alua_lu_gps_count--;
1204 spin_unlock(&lu_gps_lock);
1205 /*
1206 * Allow struct t10_alua_lu_gp * referenced by core_alua_get_lu_gp_by_name()
1207 * in target_core_configfs.c:target_core_store_alua_lu_gp() to be
1208 * released with core_alua_put_lu_gp_from_name()
1209 */
1210 while (atomic_read(&lu_gp->lu_gp_ref_cnt))
1211 cpu_relax();
1212 /*
1213 * Release reference to struct t10_alua_lu_gp * from all associated
1214 * struct se_device.
1215 */
1216 spin_lock(&lu_gp->lu_gp_lock);
1217 list_for_each_entry_safe(lu_gp_mem, lu_gp_mem_tmp,
1218 &lu_gp->lu_gp_mem_list, lu_gp_mem_list) {
1219 if (lu_gp_mem->lu_gp_assoc) {
1220 list_del(&lu_gp_mem->lu_gp_mem_list);
1221 lu_gp->lu_gp_members--;
1222 lu_gp_mem->lu_gp_assoc = 0;
1223 }
1224 spin_unlock(&lu_gp->lu_gp_lock);
1225 /*
1226 *
1227 * lu_gp_mem is associated with a single
1228 * struct se_device->dev_alua_lu_gp_mem, and is released when
1229 * struct se_device is released via core_alua_free_lu_gp_mem().
1230 *
1231 * If the passed lu_gp does NOT match the default_lu_gp, assume
1232 * we want to re-assocate a given lu_gp_mem with default_lu_gp.
1233 */
1234 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1235 if (lu_gp != default_lu_gp)
1236 __core_alua_attach_lu_gp_mem(lu_gp_mem,
1237 default_lu_gp);
1238 else
1239 lu_gp_mem->lu_gp = NULL;
1240 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1241
1242 spin_lock(&lu_gp->lu_gp_lock);
1243 }
1244 spin_unlock(&lu_gp->lu_gp_lock);
1245
1246 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
1247 }
1248
core_alua_free_lu_gp_mem(struct se_device * dev)1249 void core_alua_free_lu_gp_mem(struct se_device *dev)
1250 {
1251 struct t10_alua_lu_gp *lu_gp;
1252 struct t10_alua_lu_gp_member *lu_gp_mem;
1253
1254 lu_gp_mem = dev->dev_alua_lu_gp_mem;
1255 if (!lu_gp_mem)
1256 return;
1257
1258 while (atomic_read(&lu_gp_mem->lu_gp_mem_ref_cnt))
1259 cpu_relax();
1260
1261 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1262 lu_gp = lu_gp_mem->lu_gp;
1263 if (lu_gp) {
1264 spin_lock(&lu_gp->lu_gp_lock);
1265 if (lu_gp_mem->lu_gp_assoc) {
1266 list_del(&lu_gp_mem->lu_gp_mem_list);
1267 lu_gp->lu_gp_members--;
1268 lu_gp_mem->lu_gp_assoc = 0;
1269 }
1270 spin_unlock(&lu_gp->lu_gp_lock);
1271 lu_gp_mem->lu_gp = NULL;
1272 }
1273 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1274
1275 kmem_cache_free(t10_alua_lu_gp_mem_cache, lu_gp_mem);
1276 }
1277
core_alua_get_lu_gp_by_name(const char * name)1278 struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *name)
1279 {
1280 struct t10_alua_lu_gp *lu_gp;
1281 struct config_item *ci;
1282
1283 spin_lock(&lu_gps_lock);
1284 list_for_each_entry(lu_gp, &lu_gps_list, lu_gp_node) {
1285 if (!lu_gp->lu_gp_valid_id)
1286 continue;
1287 ci = &lu_gp->lu_gp_group.cg_item;
1288 if (!strcmp(config_item_name(ci), name)) {
1289 atomic_inc(&lu_gp->lu_gp_ref_cnt);
1290 spin_unlock(&lu_gps_lock);
1291 return lu_gp;
1292 }
1293 }
1294 spin_unlock(&lu_gps_lock);
1295
1296 return NULL;
1297 }
1298
core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp * lu_gp)1299 void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *lu_gp)
1300 {
1301 spin_lock(&lu_gps_lock);
1302 atomic_dec(&lu_gp->lu_gp_ref_cnt);
1303 spin_unlock(&lu_gps_lock);
1304 }
1305
1306 /*
1307 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
1308 */
__core_alua_attach_lu_gp_mem(struct t10_alua_lu_gp_member * lu_gp_mem,struct t10_alua_lu_gp * lu_gp)1309 void __core_alua_attach_lu_gp_mem(
1310 struct t10_alua_lu_gp_member *lu_gp_mem,
1311 struct t10_alua_lu_gp *lu_gp)
1312 {
1313 spin_lock(&lu_gp->lu_gp_lock);
1314 lu_gp_mem->lu_gp = lu_gp;
1315 lu_gp_mem->lu_gp_assoc = 1;
1316 list_add_tail(&lu_gp_mem->lu_gp_mem_list, &lu_gp->lu_gp_mem_list);
1317 lu_gp->lu_gp_members++;
1318 spin_unlock(&lu_gp->lu_gp_lock);
1319 }
1320
1321 /*
1322 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
1323 */
__core_alua_drop_lu_gp_mem(struct t10_alua_lu_gp_member * lu_gp_mem,struct t10_alua_lu_gp * lu_gp)1324 void __core_alua_drop_lu_gp_mem(
1325 struct t10_alua_lu_gp_member *lu_gp_mem,
1326 struct t10_alua_lu_gp *lu_gp)
1327 {
1328 spin_lock(&lu_gp->lu_gp_lock);
1329 list_del(&lu_gp_mem->lu_gp_mem_list);
1330 lu_gp_mem->lu_gp = NULL;
1331 lu_gp_mem->lu_gp_assoc = 0;
1332 lu_gp->lu_gp_members--;
1333 spin_unlock(&lu_gp->lu_gp_lock);
1334 }
1335
core_alua_allocate_tg_pt_gp(struct se_device * dev,const char * name,int def_group)1336 struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp(struct se_device *dev,
1337 const char *name, int def_group)
1338 {
1339 struct t10_alua_tg_pt_gp *tg_pt_gp;
1340
1341 tg_pt_gp = kmem_cache_zalloc(t10_alua_tg_pt_gp_cache, GFP_KERNEL);
1342 if (!tg_pt_gp) {
1343 pr_err("Unable to allocate struct t10_alua_tg_pt_gp\n");
1344 return NULL;
1345 }
1346 INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_list);
1347 INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_mem_list);
1348 mutex_init(&tg_pt_gp->tg_pt_gp_md_mutex);
1349 spin_lock_init(&tg_pt_gp->tg_pt_gp_lock);
1350 atomic_set(&tg_pt_gp->tg_pt_gp_ref_cnt, 0);
1351 tg_pt_gp->tg_pt_gp_dev = dev;
1352 tg_pt_gp->tg_pt_gp_md_buf_len = ALUA_MD_BUF_LEN;
1353 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
1354 ALUA_ACCESS_STATE_ACTIVE_OPTMIZED);
1355 /*
1356 * Enable both explict and implict ALUA support by default
1357 */
1358 tg_pt_gp->tg_pt_gp_alua_access_type =
1359 TPGS_EXPLICT_ALUA | TPGS_IMPLICT_ALUA;
1360 /*
1361 * Set the default Active/NonOptimized Delay in milliseconds
1362 */
1363 tg_pt_gp->tg_pt_gp_nonop_delay_msecs = ALUA_DEFAULT_NONOP_DELAY_MSECS;
1364 tg_pt_gp->tg_pt_gp_trans_delay_msecs = ALUA_DEFAULT_TRANS_DELAY_MSECS;
1365 tg_pt_gp->tg_pt_gp_implict_trans_secs = ALUA_DEFAULT_IMPLICT_TRANS_SECS;
1366
1367 if (def_group) {
1368 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1369 tg_pt_gp->tg_pt_gp_id =
1370 dev->t10_alua.alua_tg_pt_gps_counter++;
1371 tg_pt_gp->tg_pt_gp_valid_id = 1;
1372 dev->t10_alua.alua_tg_pt_gps_count++;
1373 list_add_tail(&tg_pt_gp->tg_pt_gp_list,
1374 &dev->t10_alua.tg_pt_gps_list);
1375 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1376 }
1377
1378 return tg_pt_gp;
1379 }
1380
core_alua_set_tg_pt_gp_id(struct t10_alua_tg_pt_gp * tg_pt_gp,u16 tg_pt_gp_id)1381 int core_alua_set_tg_pt_gp_id(
1382 struct t10_alua_tg_pt_gp *tg_pt_gp,
1383 u16 tg_pt_gp_id)
1384 {
1385 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1386 struct t10_alua_tg_pt_gp *tg_pt_gp_tmp;
1387 u16 tg_pt_gp_id_tmp;
1388
1389 /*
1390 * The tg_pt_gp->tg_pt_gp_id may only be set once..
1391 */
1392 if (tg_pt_gp->tg_pt_gp_valid_id) {
1393 pr_warn("ALUA TG PT Group already has a valid ID,"
1394 " ignoring request\n");
1395 return -EINVAL;
1396 }
1397
1398 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1399 if (dev->t10_alua.alua_tg_pt_gps_count == 0x0000ffff) {
1400 pr_err("Maximum ALUA alua_tg_pt_gps_count:"
1401 " 0x0000ffff reached\n");
1402 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1403 kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp);
1404 return -ENOSPC;
1405 }
1406 again:
1407 tg_pt_gp_id_tmp = (tg_pt_gp_id != 0) ? tg_pt_gp_id :
1408 dev->t10_alua.alua_tg_pt_gps_counter++;
1409
1410 list_for_each_entry(tg_pt_gp_tmp, &dev->t10_alua.tg_pt_gps_list,
1411 tg_pt_gp_list) {
1412 if (tg_pt_gp_tmp->tg_pt_gp_id == tg_pt_gp_id_tmp) {
1413 if (!tg_pt_gp_id)
1414 goto again;
1415
1416 pr_err("ALUA Target Port Group ID: %hu already"
1417 " exists, ignoring request\n", tg_pt_gp_id);
1418 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1419 return -EINVAL;
1420 }
1421 }
1422
1423 tg_pt_gp->tg_pt_gp_id = tg_pt_gp_id_tmp;
1424 tg_pt_gp->tg_pt_gp_valid_id = 1;
1425 list_add_tail(&tg_pt_gp->tg_pt_gp_list,
1426 &dev->t10_alua.tg_pt_gps_list);
1427 dev->t10_alua.alua_tg_pt_gps_count++;
1428 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1429
1430 return 0;
1431 }
1432
core_alua_allocate_tg_pt_gp_mem(struct se_port * port)1433 struct t10_alua_tg_pt_gp_member *core_alua_allocate_tg_pt_gp_mem(
1434 struct se_port *port)
1435 {
1436 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
1437
1438 tg_pt_gp_mem = kmem_cache_zalloc(t10_alua_tg_pt_gp_mem_cache,
1439 GFP_KERNEL);
1440 if (!tg_pt_gp_mem) {
1441 pr_err("Unable to allocate struct t10_alua_tg_pt_gp_member\n");
1442 return ERR_PTR(-ENOMEM);
1443 }
1444 INIT_LIST_HEAD(&tg_pt_gp_mem->tg_pt_gp_mem_list);
1445 spin_lock_init(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1446 atomic_set(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt, 0);
1447
1448 tg_pt_gp_mem->tg_pt = port;
1449 port->sep_alua_tg_pt_gp_mem = tg_pt_gp_mem;
1450
1451 return tg_pt_gp_mem;
1452 }
1453
core_alua_free_tg_pt_gp(struct t10_alua_tg_pt_gp * tg_pt_gp)1454 void core_alua_free_tg_pt_gp(
1455 struct t10_alua_tg_pt_gp *tg_pt_gp)
1456 {
1457 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1458 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *tg_pt_gp_mem_tmp;
1459
1460 /*
1461 * Once we have reached this point, config_item_put() has already
1462 * been called from target_core_alua_drop_tg_pt_gp().
1463 *
1464 * Here we remove *tg_pt_gp from the global list so that
1465 * no assications *OR* explict ALUA via SET_TARGET_PORT_GROUPS
1466 * can be made while we are releasing struct t10_alua_tg_pt_gp.
1467 */
1468 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1469 list_del(&tg_pt_gp->tg_pt_gp_list);
1470 dev->t10_alua.alua_tg_pt_gps_counter--;
1471 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1472
1473 /*
1474 * Allow a struct t10_alua_tg_pt_gp_member * referenced by
1475 * core_alua_get_tg_pt_gp_by_name() in
1476 * target_core_configfs.c:target_core_store_alua_tg_pt_gp()
1477 * to be released with core_alua_put_tg_pt_gp_from_name().
1478 */
1479 while (atomic_read(&tg_pt_gp->tg_pt_gp_ref_cnt))
1480 cpu_relax();
1481
1482 /*
1483 * Release reference to struct t10_alua_tg_pt_gp from all associated
1484 * struct se_port.
1485 */
1486 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1487 list_for_each_entry_safe(tg_pt_gp_mem, tg_pt_gp_mem_tmp,
1488 &tg_pt_gp->tg_pt_gp_mem_list, tg_pt_gp_mem_list) {
1489 if (tg_pt_gp_mem->tg_pt_gp_assoc) {
1490 list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list);
1491 tg_pt_gp->tg_pt_gp_members--;
1492 tg_pt_gp_mem->tg_pt_gp_assoc = 0;
1493 }
1494 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1495 /*
1496 * tg_pt_gp_mem is associated with a single
1497 * se_port->sep_alua_tg_pt_gp_mem, and is released via
1498 * core_alua_free_tg_pt_gp_mem().
1499 *
1500 * If the passed tg_pt_gp does NOT match the default_tg_pt_gp,
1501 * assume we want to re-assocate a given tg_pt_gp_mem with
1502 * default_tg_pt_gp.
1503 */
1504 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1505 if (tg_pt_gp != dev->t10_alua.default_tg_pt_gp) {
1506 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
1507 dev->t10_alua.default_tg_pt_gp);
1508 } else
1509 tg_pt_gp_mem->tg_pt_gp = NULL;
1510 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1511
1512 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1513 }
1514 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1515
1516 kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp);
1517 }
1518
core_alua_free_tg_pt_gp_mem(struct se_port * port)1519 void core_alua_free_tg_pt_gp_mem(struct se_port *port)
1520 {
1521 struct t10_alua_tg_pt_gp *tg_pt_gp;
1522 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
1523
1524 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
1525 if (!tg_pt_gp_mem)
1526 return;
1527
1528 while (atomic_read(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt))
1529 cpu_relax();
1530
1531 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1532 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
1533 if (tg_pt_gp) {
1534 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1535 if (tg_pt_gp_mem->tg_pt_gp_assoc) {
1536 list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list);
1537 tg_pt_gp->tg_pt_gp_members--;
1538 tg_pt_gp_mem->tg_pt_gp_assoc = 0;
1539 }
1540 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1541 tg_pt_gp_mem->tg_pt_gp = NULL;
1542 }
1543 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1544
1545 kmem_cache_free(t10_alua_tg_pt_gp_mem_cache, tg_pt_gp_mem);
1546 }
1547
core_alua_get_tg_pt_gp_by_name(struct se_device * dev,const char * name)1548 static struct t10_alua_tg_pt_gp *core_alua_get_tg_pt_gp_by_name(
1549 struct se_device *dev, const char *name)
1550 {
1551 struct t10_alua_tg_pt_gp *tg_pt_gp;
1552 struct config_item *ci;
1553
1554 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1555 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
1556 tg_pt_gp_list) {
1557 if (!tg_pt_gp->tg_pt_gp_valid_id)
1558 continue;
1559 ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
1560 if (!strcmp(config_item_name(ci), name)) {
1561 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
1562 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1563 return tg_pt_gp;
1564 }
1565 }
1566 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1567
1568 return NULL;
1569 }
1570
core_alua_put_tg_pt_gp_from_name(struct t10_alua_tg_pt_gp * tg_pt_gp)1571 static void core_alua_put_tg_pt_gp_from_name(
1572 struct t10_alua_tg_pt_gp *tg_pt_gp)
1573 {
1574 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1575
1576 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1577 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
1578 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1579 }
1580
1581 /*
1582 * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held
1583 */
__core_alua_attach_tg_pt_gp_mem(struct t10_alua_tg_pt_gp_member * tg_pt_gp_mem,struct t10_alua_tg_pt_gp * tg_pt_gp)1584 void __core_alua_attach_tg_pt_gp_mem(
1585 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
1586 struct t10_alua_tg_pt_gp *tg_pt_gp)
1587 {
1588 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1589 tg_pt_gp_mem->tg_pt_gp = tg_pt_gp;
1590 tg_pt_gp_mem->tg_pt_gp_assoc = 1;
1591 list_add_tail(&tg_pt_gp_mem->tg_pt_gp_mem_list,
1592 &tg_pt_gp->tg_pt_gp_mem_list);
1593 tg_pt_gp->tg_pt_gp_members++;
1594 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1595 }
1596
1597 /*
1598 * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held
1599 */
__core_alua_drop_tg_pt_gp_mem(struct t10_alua_tg_pt_gp_member * tg_pt_gp_mem,struct t10_alua_tg_pt_gp * tg_pt_gp)1600 static void __core_alua_drop_tg_pt_gp_mem(
1601 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
1602 struct t10_alua_tg_pt_gp *tg_pt_gp)
1603 {
1604 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1605 list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list);
1606 tg_pt_gp_mem->tg_pt_gp = NULL;
1607 tg_pt_gp_mem->tg_pt_gp_assoc = 0;
1608 tg_pt_gp->tg_pt_gp_members--;
1609 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1610 }
1611
core_alua_show_tg_pt_gp_info(struct se_port * port,char * page)1612 ssize_t core_alua_show_tg_pt_gp_info(struct se_port *port, char *page)
1613 {
1614 struct config_item *tg_pt_ci;
1615 struct t10_alua_tg_pt_gp *tg_pt_gp;
1616 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
1617 ssize_t len = 0;
1618
1619 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
1620 if (!tg_pt_gp_mem)
1621 return len;
1622
1623 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1624 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
1625 if (tg_pt_gp) {
1626 tg_pt_ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
1627 len += sprintf(page, "TG Port Alias: %s\nTG Port Group ID:"
1628 " %hu\nTG Port Primary Access State: %s\nTG Port "
1629 "Primary Access Status: %s\nTG Port Secondary Access"
1630 " State: %s\nTG Port Secondary Access Status: %s\n",
1631 config_item_name(tg_pt_ci), tg_pt_gp->tg_pt_gp_id,
1632 core_alua_dump_state(atomic_read(
1633 &tg_pt_gp->tg_pt_gp_alua_access_state)),
1634 core_alua_dump_status(
1635 tg_pt_gp->tg_pt_gp_alua_access_status),
1636 (atomic_read(&port->sep_tg_pt_secondary_offline)) ?
1637 "Offline" : "None",
1638 core_alua_dump_status(port->sep_tg_pt_secondary_stat));
1639 }
1640 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1641
1642 return len;
1643 }
1644
core_alua_store_tg_pt_gp_info(struct se_port * port,const char * page,size_t count)1645 ssize_t core_alua_store_tg_pt_gp_info(
1646 struct se_port *port,
1647 const char *page,
1648 size_t count)
1649 {
1650 struct se_portal_group *tpg;
1651 struct se_lun *lun;
1652 struct se_device *dev = port->sep_lun->lun_se_dev;
1653 struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *tg_pt_gp_new = NULL;
1654 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
1655 unsigned char buf[TG_PT_GROUP_NAME_BUF];
1656 int move = 0;
1657
1658 tpg = port->sep_tpg;
1659 lun = port->sep_lun;
1660
1661 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
1662 if (!tg_pt_gp_mem)
1663 return 0;
1664
1665 if (count > TG_PT_GROUP_NAME_BUF) {
1666 pr_err("ALUA Target Port Group alias too large!\n");
1667 return -EINVAL;
1668 }
1669 memset(buf, 0, TG_PT_GROUP_NAME_BUF);
1670 memcpy(buf, page, count);
1671 /*
1672 * Any ALUA target port group alias besides "NULL" means we will be
1673 * making a new group association.
1674 */
1675 if (strcmp(strstrip(buf), "NULL")) {
1676 /*
1677 * core_alua_get_tg_pt_gp_by_name() will increment reference to
1678 * struct t10_alua_tg_pt_gp. This reference is released with
1679 * core_alua_put_tg_pt_gp_from_name() below.
1680 */
1681 tg_pt_gp_new = core_alua_get_tg_pt_gp_by_name(dev,
1682 strstrip(buf));
1683 if (!tg_pt_gp_new)
1684 return -ENODEV;
1685 }
1686
1687 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1688 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
1689 if (tg_pt_gp) {
1690 /*
1691 * Clearing an existing tg_pt_gp association, and replacing
1692 * with the default_tg_pt_gp.
1693 */
1694 if (!tg_pt_gp_new) {
1695 pr_debug("Target_Core_ConfigFS: Moving"
1696 " %s/tpgt_%hu/%s from ALUA Target Port Group:"
1697 " alua/%s, ID: %hu back to"
1698 " default_tg_pt_gp\n",
1699 tpg->se_tpg_tfo->tpg_get_wwn(tpg),
1700 tpg->se_tpg_tfo->tpg_get_tag(tpg),
1701 config_item_name(&lun->lun_group.cg_item),
1702 config_item_name(
1703 &tg_pt_gp->tg_pt_gp_group.cg_item),
1704 tg_pt_gp->tg_pt_gp_id);
1705
1706 __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp);
1707 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
1708 dev->t10_alua.default_tg_pt_gp);
1709 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1710
1711 return count;
1712 }
1713 /*
1714 * Removing existing association of tg_pt_gp_mem with tg_pt_gp
1715 */
1716 __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp);
1717 move = 1;
1718 }
1719 /*
1720 * Associate tg_pt_gp_mem with tg_pt_gp_new.
1721 */
1722 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp_new);
1723 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1724 pr_debug("Target_Core_ConfigFS: %s %s/tpgt_%hu/%s to ALUA"
1725 " Target Port Group: alua/%s, ID: %hu\n", (move) ?
1726 "Moving" : "Adding", tpg->se_tpg_tfo->tpg_get_wwn(tpg),
1727 tpg->se_tpg_tfo->tpg_get_tag(tpg),
1728 config_item_name(&lun->lun_group.cg_item),
1729 config_item_name(&tg_pt_gp_new->tg_pt_gp_group.cg_item),
1730 tg_pt_gp_new->tg_pt_gp_id);
1731
1732 core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new);
1733 return count;
1734 }
1735
core_alua_show_access_type(struct t10_alua_tg_pt_gp * tg_pt_gp,char * page)1736 ssize_t core_alua_show_access_type(
1737 struct t10_alua_tg_pt_gp *tg_pt_gp,
1738 char *page)
1739 {
1740 if ((tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA) &&
1741 (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICT_ALUA))
1742 return sprintf(page, "Implict and Explict\n");
1743 else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICT_ALUA)
1744 return sprintf(page, "Implict\n");
1745 else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA)
1746 return sprintf(page, "Explict\n");
1747 else
1748 return sprintf(page, "None\n");
1749 }
1750
core_alua_store_access_type(struct t10_alua_tg_pt_gp * tg_pt_gp,const char * page,size_t count)1751 ssize_t core_alua_store_access_type(
1752 struct t10_alua_tg_pt_gp *tg_pt_gp,
1753 const char *page,
1754 size_t count)
1755 {
1756 unsigned long tmp;
1757 int ret;
1758
1759 ret = strict_strtoul(page, 0, &tmp);
1760 if (ret < 0) {
1761 pr_err("Unable to extract alua_access_type\n");
1762 return -EINVAL;
1763 }
1764 if ((tmp != 0) && (tmp != 1) && (tmp != 2) && (tmp != 3)) {
1765 pr_err("Illegal value for alua_access_type:"
1766 " %lu\n", tmp);
1767 return -EINVAL;
1768 }
1769 if (tmp == 3)
1770 tg_pt_gp->tg_pt_gp_alua_access_type =
1771 TPGS_IMPLICT_ALUA | TPGS_EXPLICT_ALUA;
1772 else if (tmp == 2)
1773 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_EXPLICT_ALUA;
1774 else if (tmp == 1)
1775 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_IMPLICT_ALUA;
1776 else
1777 tg_pt_gp->tg_pt_gp_alua_access_type = 0;
1778
1779 return count;
1780 }
1781
core_alua_show_nonop_delay_msecs(struct t10_alua_tg_pt_gp * tg_pt_gp,char * page)1782 ssize_t core_alua_show_nonop_delay_msecs(
1783 struct t10_alua_tg_pt_gp *tg_pt_gp,
1784 char *page)
1785 {
1786 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_nonop_delay_msecs);
1787 }
1788
core_alua_store_nonop_delay_msecs(struct t10_alua_tg_pt_gp * tg_pt_gp,const char * page,size_t count)1789 ssize_t core_alua_store_nonop_delay_msecs(
1790 struct t10_alua_tg_pt_gp *tg_pt_gp,
1791 const char *page,
1792 size_t count)
1793 {
1794 unsigned long tmp;
1795 int ret;
1796
1797 ret = strict_strtoul(page, 0, &tmp);
1798 if (ret < 0) {
1799 pr_err("Unable to extract nonop_delay_msecs\n");
1800 return -EINVAL;
1801 }
1802 if (tmp > ALUA_MAX_NONOP_DELAY_MSECS) {
1803 pr_err("Passed nonop_delay_msecs: %lu, exceeds"
1804 " ALUA_MAX_NONOP_DELAY_MSECS: %d\n", tmp,
1805 ALUA_MAX_NONOP_DELAY_MSECS);
1806 return -EINVAL;
1807 }
1808 tg_pt_gp->tg_pt_gp_nonop_delay_msecs = (int)tmp;
1809
1810 return count;
1811 }
1812
core_alua_show_trans_delay_msecs(struct t10_alua_tg_pt_gp * tg_pt_gp,char * page)1813 ssize_t core_alua_show_trans_delay_msecs(
1814 struct t10_alua_tg_pt_gp *tg_pt_gp,
1815 char *page)
1816 {
1817 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_trans_delay_msecs);
1818 }
1819
core_alua_store_trans_delay_msecs(struct t10_alua_tg_pt_gp * tg_pt_gp,const char * page,size_t count)1820 ssize_t core_alua_store_trans_delay_msecs(
1821 struct t10_alua_tg_pt_gp *tg_pt_gp,
1822 const char *page,
1823 size_t count)
1824 {
1825 unsigned long tmp;
1826 int ret;
1827
1828 ret = strict_strtoul(page, 0, &tmp);
1829 if (ret < 0) {
1830 pr_err("Unable to extract trans_delay_msecs\n");
1831 return -EINVAL;
1832 }
1833 if (tmp > ALUA_MAX_TRANS_DELAY_MSECS) {
1834 pr_err("Passed trans_delay_msecs: %lu, exceeds"
1835 " ALUA_MAX_TRANS_DELAY_MSECS: %d\n", tmp,
1836 ALUA_MAX_TRANS_DELAY_MSECS);
1837 return -EINVAL;
1838 }
1839 tg_pt_gp->tg_pt_gp_trans_delay_msecs = (int)tmp;
1840
1841 return count;
1842 }
1843
core_alua_show_implict_trans_secs(struct t10_alua_tg_pt_gp * tg_pt_gp,char * page)1844 ssize_t core_alua_show_implict_trans_secs(
1845 struct t10_alua_tg_pt_gp *tg_pt_gp,
1846 char *page)
1847 {
1848 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_implict_trans_secs);
1849 }
1850
core_alua_store_implict_trans_secs(struct t10_alua_tg_pt_gp * tg_pt_gp,const char * page,size_t count)1851 ssize_t core_alua_store_implict_trans_secs(
1852 struct t10_alua_tg_pt_gp *tg_pt_gp,
1853 const char *page,
1854 size_t count)
1855 {
1856 unsigned long tmp;
1857 int ret;
1858
1859 ret = strict_strtoul(page, 0, &tmp);
1860 if (ret < 0) {
1861 pr_err("Unable to extract implict_trans_secs\n");
1862 return -EINVAL;
1863 }
1864 if (tmp > ALUA_MAX_IMPLICT_TRANS_SECS) {
1865 pr_err("Passed implict_trans_secs: %lu, exceeds"
1866 " ALUA_MAX_IMPLICT_TRANS_SECS: %d\n", tmp,
1867 ALUA_MAX_IMPLICT_TRANS_SECS);
1868 return -EINVAL;
1869 }
1870 tg_pt_gp->tg_pt_gp_implict_trans_secs = (int)tmp;
1871
1872 return count;
1873 }
1874
core_alua_show_preferred_bit(struct t10_alua_tg_pt_gp * tg_pt_gp,char * page)1875 ssize_t core_alua_show_preferred_bit(
1876 struct t10_alua_tg_pt_gp *tg_pt_gp,
1877 char *page)
1878 {
1879 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_pref);
1880 }
1881
core_alua_store_preferred_bit(struct t10_alua_tg_pt_gp * tg_pt_gp,const char * page,size_t count)1882 ssize_t core_alua_store_preferred_bit(
1883 struct t10_alua_tg_pt_gp *tg_pt_gp,
1884 const char *page,
1885 size_t count)
1886 {
1887 unsigned long tmp;
1888 int ret;
1889
1890 ret = strict_strtoul(page, 0, &tmp);
1891 if (ret < 0) {
1892 pr_err("Unable to extract preferred ALUA value\n");
1893 return -EINVAL;
1894 }
1895 if ((tmp != 0) && (tmp != 1)) {
1896 pr_err("Illegal value for preferred ALUA: %lu\n", tmp);
1897 return -EINVAL;
1898 }
1899 tg_pt_gp->tg_pt_gp_pref = (int)tmp;
1900
1901 return count;
1902 }
1903
core_alua_show_offline_bit(struct se_lun * lun,char * page)1904 ssize_t core_alua_show_offline_bit(struct se_lun *lun, char *page)
1905 {
1906 if (!lun->lun_sep)
1907 return -ENODEV;
1908
1909 return sprintf(page, "%d\n",
1910 atomic_read(&lun->lun_sep->sep_tg_pt_secondary_offline));
1911 }
1912
core_alua_store_offline_bit(struct se_lun * lun,const char * page,size_t count)1913 ssize_t core_alua_store_offline_bit(
1914 struct se_lun *lun,
1915 const char *page,
1916 size_t count)
1917 {
1918 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
1919 unsigned long tmp;
1920 int ret;
1921
1922 if (!lun->lun_sep)
1923 return -ENODEV;
1924
1925 ret = strict_strtoul(page, 0, &tmp);
1926 if (ret < 0) {
1927 pr_err("Unable to extract alua_tg_pt_offline value\n");
1928 return -EINVAL;
1929 }
1930 if ((tmp != 0) && (tmp != 1)) {
1931 pr_err("Illegal value for alua_tg_pt_offline: %lu\n",
1932 tmp);
1933 return -EINVAL;
1934 }
1935 tg_pt_gp_mem = lun->lun_sep->sep_alua_tg_pt_gp_mem;
1936 if (!tg_pt_gp_mem) {
1937 pr_err("Unable to locate *tg_pt_gp_mem\n");
1938 return -EINVAL;
1939 }
1940
1941 ret = core_alua_set_tg_pt_secondary_state(tg_pt_gp_mem,
1942 lun->lun_sep, 0, (int)tmp);
1943 if (ret < 0)
1944 return -EINVAL;
1945
1946 return count;
1947 }
1948
core_alua_show_secondary_status(struct se_lun * lun,char * page)1949 ssize_t core_alua_show_secondary_status(
1950 struct se_lun *lun,
1951 char *page)
1952 {
1953 return sprintf(page, "%d\n", lun->lun_sep->sep_tg_pt_secondary_stat);
1954 }
1955
core_alua_store_secondary_status(struct se_lun * lun,const char * page,size_t count)1956 ssize_t core_alua_store_secondary_status(
1957 struct se_lun *lun,
1958 const char *page,
1959 size_t count)
1960 {
1961 unsigned long tmp;
1962 int ret;
1963
1964 ret = strict_strtoul(page, 0, &tmp);
1965 if (ret < 0) {
1966 pr_err("Unable to extract alua_tg_pt_status\n");
1967 return -EINVAL;
1968 }
1969 if ((tmp != ALUA_STATUS_NONE) &&
1970 (tmp != ALUA_STATUS_ALTERED_BY_EXPLICT_STPG) &&
1971 (tmp != ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA)) {
1972 pr_err("Illegal value for alua_tg_pt_status: %lu\n",
1973 tmp);
1974 return -EINVAL;
1975 }
1976 lun->lun_sep->sep_tg_pt_secondary_stat = (int)tmp;
1977
1978 return count;
1979 }
1980
core_alua_show_secondary_write_metadata(struct se_lun * lun,char * page)1981 ssize_t core_alua_show_secondary_write_metadata(
1982 struct se_lun *lun,
1983 char *page)
1984 {
1985 return sprintf(page, "%d\n",
1986 lun->lun_sep->sep_tg_pt_secondary_write_md);
1987 }
1988
core_alua_store_secondary_write_metadata(struct se_lun * lun,const char * page,size_t count)1989 ssize_t core_alua_store_secondary_write_metadata(
1990 struct se_lun *lun,
1991 const char *page,
1992 size_t count)
1993 {
1994 unsigned long tmp;
1995 int ret;
1996
1997 ret = strict_strtoul(page, 0, &tmp);
1998 if (ret < 0) {
1999 pr_err("Unable to extract alua_tg_pt_write_md\n");
2000 return -EINVAL;
2001 }
2002 if ((tmp != 0) && (tmp != 1)) {
2003 pr_err("Illegal value for alua_tg_pt_write_md:"
2004 " %lu\n", tmp);
2005 return -EINVAL;
2006 }
2007 lun->lun_sep->sep_tg_pt_secondary_write_md = (int)tmp;
2008
2009 return count;
2010 }
2011
core_setup_alua(struct se_device * dev)2012 int core_setup_alua(struct se_device *dev)
2013 {
2014 if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV &&
2015 !(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) {
2016 struct t10_alua_lu_gp_member *lu_gp_mem;
2017
2018 /*
2019 * Associate this struct se_device with the default ALUA
2020 * LUN Group.
2021 */
2022 lu_gp_mem = core_alua_allocate_lu_gp_mem(dev);
2023 if (IS_ERR(lu_gp_mem))
2024 return PTR_ERR(lu_gp_mem);
2025
2026 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
2027 __core_alua_attach_lu_gp_mem(lu_gp_mem,
2028 default_lu_gp);
2029 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
2030
2031 pr_debug("%s: Adding to default ALUA LU Group:"
2032 " core/alua/lu_gps/default_lu_gp\n",
2033 dev->transport->name);
2034 }
2035
2036 return 0;
2037 }
2038