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target: Add percpu refcounting for se_lun access
[mirror_ubuntu-artful-kernel.git] / drivers / target / target_core_xcopy.c
1 /*******************************************************************************
2 * Filename: target_core_xcopy.c
3 *
4 * This file contains support for SPC-4 Extended-Copy offload with generic
5 * TCM backends.
6 *
7 * Copyright (c) 2011-2013 Datera, Inc. All rights reserved.
8 *
9 * Author:
10 * Nicholas A. Bellinger <nab@daterainc.com>
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 *
22 ******************************************************************************/
23
24 #include <linux/slab.h>
25 #include <linux/spinlock.h>
26 #include <linux/list.h>
27 #include <linux/configfs.h>
28 #include <scsi/scsi.h>
29 #include <scsi/scsi_cmnd.h>
30 #include <asm/unaligned.h>
31
32 #include <target/target_core_base.h>
33 #include <target/target_core_backend.h>
34 #include <target/target_core_fabric.h>
35 #include <target/target_core_configfs.h>
36
37 #include "target_core_pr.h"
38 #include "target_core_ua.h"
39 #include "target_core_xcopy.h"
40
41 static struct workqueue_struct *xcopy_wq = NULL;
42 /*
43 * From target_core_spc.c
44 */
45 extern void spc_parse_naa_6h_vendor_specific(struct se_device *, unsigned char *);
46 /*
47 * From target_core_device.c
48 */
49 extern struct mutex g_device_mutex;
50 extern struct list_head g_device_list;
51 /*
52 * From target_core_configfs.c
53 */
54 extern struct configfs_subsystem *target_core_subsystem[];
55
56 static int target_xcopy_gen_naa_ieee(struct se_device *dev, unsigned char *buf)
57 {
58 int off = 0;
59
60 buf[off++] = (0x6 << 4);
61 buf[off++] = 0x01;
62 buf[off++] = 0x40;
63 buf[off] = (0x5 << 4);
64
65 spc_parse_naa_6h_vendor_specific(dev, &buf[off]);
66 return 0;
67 }
68
69 static int target_xcopy_locate_se_dev_e4(struct se_cmd *se_cmd, struct xcopy_op *xop,
70 bool src)
71 {
72 struct se_device *se_dev;
73 struct configfs_subsystem *subsys = target_core_subsystem[0];
74 unsigned char tmp_dev_wwn[XCOPY_NAA_IEEE_REGEX_LEN], *dev_wwn;
75 int rc;
76
77 if (src == true)
78 dev_wwn = &xop->dst_tid_wwn[0];
79 else
80 dev_wwn = &xop->src_tid_wwn[0];
81
82 mutex_lock(&g_device_mutex);
83 list_for_each_entry(se_dev, &g_device_list, g_dev_node) {
84
85 memset(&tmp_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN);
86 target_xcopy_gen_naa_ieee(se_dev, &tmp_dev_wwn[0]);
87
88 rc = memcmp(&tmp_dev_wwn[0], dev_wwn, XCOPY_NAA_IEEE_REGEX_LEN);
89 if (rc != 0)
90 continue;
91
92 if (src == true) {
93 xop->dst_dev = se_dev;
94 pr_debug("XCOPY 0xe4: Setting xop->dst_dev: %p from located"
95 " se_dev\n", xop->dst_dev);
96 } else {
97 xop->src_dev = se_dev;
98 pr_debug("XCOPY 0xe4: Setting xop->src_dev: %p from located"
99 " se_dev\n", xop->src_dev);
100 }
101
102 rc = configfs_depend_item(subsys,
103 &se_dev->dev_group.cg_item);
104 if (rc != 0) {
105 pr_err("configfs_depend_item attempt failed:"
106 " %d for se_dev: %p\n", rc, se_dev);
107 mutex_unlock(&g_device_mutex);
108 return rc;
109 }
110
111 pr_debug("Called configfs_depend_item for subsys: %p se_dev: %p"
112 " se_dev->se_dev_group: %p\n", subsys, se_dev,
113 &se_dev->dev_group);
114
115 mutex_unlock(&g_device_mutex);
116 return 0;
117 }
118 mutex_unlock(&g_device_mutex);
119
120 pr_err("Unable to locate 0xe4 descriptor for EXTENDED_COPY\n");
121 return -EINVAL;
122 }
123
124 static int target_xcopy_parse_tiddesc_e4(struct se_cmd *se_cmd, struct xcopy_op *xop,
125 unsigned char *p, bool src)
126 {
127 unsigned char *desc = p;
128 unsigned short ript;
129 u8 desig_len;
130 /*
131 * Extract RELATIVE INITIATOR PORT IDENTIFIER
132 */
133 ript = get_unaligned_be16(&desc[2]);
134 pr_debug("XCOPY 0xe4: RELATIVE INITIATOR PORT IDENTIFIER: %hu\n", ript);
135 /*
136 * Check for supported code set, association, and designator type
137 */
138 if ((desc[4] & 0x0f) != 0x1) {
139 pr_err("XCOPY 0xe4: code set of non binary type not supported\n");
140 return -EINVAL;
141 }
142 if ((desc[5] & 0x30) != 0x00) {
143 pr_err("XCOPY 0xe4: association other than LUN not supported\n");
144 return -EINVAL;
145 }
146 if ((desc[5] & 0x0f) != 0x3) {
147 pr_err("XCOPY 0xe4: designator type unsupported: 0x%02x\n",
148 (desc[5] & 0x0f));
149 return -EINVAL;
150 }
151 /*
152 * Check for matching 16 byte length for NAA IEEE Registered Extended
153 * Assigned designator
154 */
155 desig_len = desc[7];
156 if (desig_len != 16) {
157 pr_err("XCOPY 0xe4: invalid desig_len: %d\n", (int)desig_len);
158 return -EINVAL;
159 }
160 pr_debug("XCOPY 0xe4: desig_len: %d\n", (int)desig_len);
161 /*
162 * Check for NAA IEEE Registered Extended Assigned header..
163 */
164 if ((desc[8] & 0xf0) != 0x60) {
165 pr_err("XCOPY 0xe4: Unsupported DESIGNATOR TYPE: 0x%02x\n",
166 (desc[8] & 0xf0));
167 return -EINVAL;
168 }
169
170 if (src == true) {
171 memcpy(&xop->src_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN);
172 /*
173 * Determine if the source designator matches the local device
174 */
175 if (!memcmp(&xop->local_dev_wwn[0], &xop->src_tid_wwn[0],
176 XCOPY_NAA_IEEE_REGEX_LEN)) {
177 xop->op_origin = XCOL_SOURCE_RECV_OP;
178 xop->src_dev = se_cmd->se_dev;
179 pr_debug("XCOPY 0xe4: Set xop->src_dev %p from source"
180 " received xop\n", xop->src_dev);
181 }
182 } else {
183 memcpy(&xop->dst_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN);
184 /*
185 * Determine if the destination designator matches the local device
186 */
187 if (!memcmp(&xop->local_dev_wwn[0], &xop->dst_tid_wwn[0],
188 XCOPY_NAA_IEEE_REGEX_LEN)) {
189 xop->op_origin = XCOL_DEST_RECV_OP;
190 xop->dst_dev = se_cmd->se_dev;
191 pr_debug("XCOPY 0xe4: Set xop->dst_dev: %p from destination"
192 " received xop\n", xop->dst_dev);
193 }
194 }
195
196 return 0;
197 }
198
199 static int target_xcopy_parse_target_descriptors(struct se_cmd *se_cmd,
200 struct xcopy_op *xop, unsigned char *p,
201 unsigned short tdll)
202 {
203 struct se_device *local_dev = se_cmd->se_dev;
204 unsigned char *desc = p;
205 int offset = tdll % XCOPY_TARGET_DESC_LEN, rc, ret = 0;
206 unsigned short start = 0;
207 bool src = true;
208
209 if (offset != 0) {
210 pr_err("XCOPY target descriptor list length is not"
211 " multiple of %d\n", XCOPY_TARGET_DESC_LEN);
212 return -EINVAL;
213 }
214 if (tdll > 64) {
215 pr_err("XCOPY target descriptor supports a maximum"
216 " two src/dest descriptors, tdll: %hu too large..\n", tdll);
217 return -EINVAL;
218 }
219 /*
220 * Generate an IEEE Registered Extended designator based upon the
221 * se_device the XCOPY was received upon..
222 */
223 memset(&xop->local_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN);
224 target_xcopy_gen_naa_ieee(local_dev, &xop->local_dev_wwn[0]);
225
226 while (start < tdll) {
227 /*
228 * Check target descriptor identification with 0xE4 type with
229 * use VPD 0x83 WWPN matching ..
230 */
231 switch (desc[0]) {
232 case 0xe4:
233 rc = target_xcopy_parse_tiddesc_e4(se_cmd, xop,
234 &desc[0], src);
235 if (rc != 0)
236 goto out;
237 /*
238 * Assume target descriptors are in source -> destination order..
239 */
240 if (src == true)
241 src = false;
242 else
243 src = true;
244 start += XCOPY_TARGET_DESC_LEN;
245 desc += XCOPY_TARGET_DESC_LEN;
246 ret++;
247 break;
248 default:
249 pr_err("XCOPY unsupported descriptor type code:"
250 " 0x%02x\n", desc[0]);
251 goto out;
252 }
253 }
254
255 if (xop->op_origin == XCOL_SOURCE_RECV_OP)
256 rc = target_xcopy_locate_se_dev_e4(se_cmd, xop, true);
257 else
258 rc = target_xcopy_locate_se_dev_e4(se_cmd, xop, false);
259
260 if (rc < 0)
261 goto out;
262
263 pr_debug("XCOPY TGT desc: Source dev: %p NAA IEEE WWN: 0x%16phN\n",
264 xop->src_dev, &xop->src_tid_wwn[0]);
265 pr_debug("XCOPY TGT desc: Dest dev: %p NAA IEEE WWN: 0x%16phN\n",
266 xop->dst_dev, &xop->dst_tid_wwn[0]);
267
268 return ret;
269
270 out:
271 return -EINVAL;
272 }
273
274 static int target_xcopy_parse_segdesc_02(struct se_cmd *se_cmd, struct xcopy_op *xop,
275 unsigned char *p)
276 {
277 unsigned char *desc = p;
278 int dc = (desc[1] & 0x02);
279 unsigned short desc_len;
280
281 desc_len = get_unaligned_be16(&desc[2]);
282 if (desc_len != 0x18) {
283 pr_err("XCOPY segment desc 0x02: Illegal desc_len:"
284 " %hu\n", desc_len);
285 return -EINVAL;
286 }
287
288 xop->stdi = get_unaligned_be16(&desc[4]);
289 xop->dtdi = get_unaligned_be16(&desc[6]);
290 pr_debug("XCOPY seg desc 0x02: desc_len: %hu stdi: %hu dtdi: %hu, DC: %d\n",
291 desc_len, xop->stdi, xop->dtdi, dc);
292
293 xop->nolb = get_unaligned_be16(&desc[10]);
294 xop->src_lba = get_unaligned_be64(&desc[12]);
295 xop->dst_lba = get_unaligned_be64(&desc[20]);
296 pr_debug("XCOPY seg desc 0x02: nolb: %hu src_lba: %llu dst_lba: %llu\n",
297 xop->nolb, (unsigned long long)xop->src_lba,
298 (unsigned long long)xop->dst_lba);
299
300 if (dc != 0) {
301 xop->dbl = (desc[29] << 16) & 0xff;
302 xop->dbl |= (desc[30] << 8) & 0xff;
303 xop->dbl |= desc[31] & 0xff;
304
305 pr_debug("XCOPY seg desc 0x02: DC=1 w/ dbl: %u\n", xop->dbl);
306 }
307 return 0;
308 }
309
310 static int target_xcopy_parse_segment_descriptors(struct se_cmd *se_cmd,
311 struct xcopy_op *xop, unsigned char *p,
312 unsigned int sdll)
313 {
314 unsigned char *desc = p;
315 unsigned int start = 0;
316 int offset = sdll % XCOPY_SEGMENT_DESC_LEN, rc, ret = 0;
317
318 if (offset != 0) {
319 pr_err("XCOPY segment descriptor list length is not"
320 " multiple of %d\n", XCOPY_SEGMENT_DESC_LEN);
321 return -EINVAL;
322 }
323
324 while (start < sdll) {
325 /*
326 * Check segment descriptor type code for block -> block
327 */
328 switch (desc[0]) {
329 case 0x02:
330 rc = target_xcopy_parse_segdesc_02(se_cmd, xop, desc);
331 if (rc < 0)
332 goto out;
333
334 ret++;
335 start += XCOPY_SEGMENT_DESC_LEN;
336 desc += XCOPY_SEGMENT_DESC_LEN;
337 break;
338 default:
339 pr_err("XCOPY unspported segment descriptor"
340 "type: 0x%02x\n", desc[0]);
341 goto out;
342 }
343 }
344
345 return ret;
346
347 out:
348 return -EINVAL;
349 }
350
351 /*
352 * Start xcopy_pt ops
353 */
354
355 struct xcopy_pt_cmd {
356 bool remote_port;
357 struct se_cmd se_cmd;
358 struct xcopy_op *xcopy_op;
359 struct completion xpt_passthrough_sem;
360 };
361
362 static struct se_port xcopy_pt_port;
363 static struct se_portal_group xcopy_pt_tpg;
364 static struct se_session xcopy_pt_sess;
365 static struct se_node_acl xcopy_pt_nacl;
366
367 static char *xcopy_pt_get_fabric_name(void)
368 {
369 return "xcopy-pt";
370 }
371
372 static u32 xcopy_pt_get_tag(struct se_cmd *se_cmd)
373 {
374 return 0;
375 }
376
377 static int xcopy_pt_get_cmd_state(struct se_cmd *se_cmd)
378 {
379 return 0;
380 }
381
382 static void xcopy_pt_undepend_remotedev(struct xcopy_op *xop)
383 {
384 struct configfs_subsystem *subsys = target_core_subsystem[0];
385 struct se_device *remote_dev;
386
387 if (xop->op_origin == XCOL_SOURCE_RECV_OP)
388 remote_dev = xop->dst_dev;
389 else
390 remote_dev = xop->src_dev;
391
392 pr_debug("Calling configfs_undepend_item for subsys: %p"
393 " remote_dev: %p remote_dev->dev_group: %p\n",
394 subsys, remote_dev, &remote_dev->dev_group.cg_item);
395
396 configfs_undepend_item(subsys, &remote_dev->dev_group.cg_item);
397 }
398
399 static void xcopy_pt_release_cmd(struct se_cmd *se_cmd)
400 {
401 struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd,
402 struct xcopy_pt_cmd, se_cmd);
403
404 if (xpt_cmd->remote_port)
405 kfree(se_cmd->se_lun);
406
407 kfree(xpt_cmd);
408 }
409
410 static int xcopy_pt_check_stop_free(struct se_cmd *se_cmd)
411 {
412 struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd,
413 struct xcopy_pt_cmd, se_cmd);
414
415 complete(&xpt_cmd->xpt_passthrough_sem);
416 return 0;
417 }
418
419 static int xcopy_pt_write_pending(struct se_cmd *se_cmd)
420 {
421 return 0;
422 }
423
424 static int xcopy_pt_write_pending_status(struct se_cmd *se_cmd)
425 {
426 return 0;
427 }
428
429 static int xcopy_pt_queue_data_in(struct se_cmd *se_cmd)
430 {
431 return 0;
432 }
433
434 static int xcopy_pt_queue_status(struct se_cmd *se_cmd)
435 {
436 return 0;
437 }
438
439 static struct target_core_fabric_ops xcopy_pt_tfo = {
440 .get_fabric_name = xcopy_pt_get_fabric_name,
441 .get_task_tag = xcopy_pt_get_tag,
442 .get_cmd_state = xcopy_pt_get_cmd_state,
443 .release_cmd = xcopy_pt_release_cmd,
444 .check_stop_free = xcopy_pt_check_stop_free,
445 .write_pending = xcopy_pt_write_pending,
446 .write_pending_status = xcopy_pt_write_pending_status,
447 .queue_data_in = xcopy_pt_queue_data_in,
448 .queue_status = xcopy_pt_queue_status,
449 };
450
451 /*
452 * End xcopy_pt_ops
453 */
454
455 int target_xcopy_setup_pt(void)
456 {
457 xcopy_wq = alloc_workqueue("xcopy_wq", WQ_MEM_RECLAIM, 0);
458 if (!xcopy_wq) {
459 pr_err("Unable to allocate xcopy_wq\n");
460 return -ENOMEM;
461 }
462
463 memset(&xcopy_pt_port, 0, sizeof(struct se_port));
464 INIT_LIST_HEAD(&xcopy_pt_port.sep_alua_list);
465 INIT_LIST_HEAD(&xcopy_pt_port.sep_list);
466 mutex_init(&xcopy_pt_port.sep_tg_pt_md_mutex);
467
468 memset(&xcopy_pt_tpg, 0, sizeof(struct se_portal_group));
469 INIT_LIST_HEAD(&xcopy_pt_tpg.se_tpg_node);
470 INIT_LIST_HEAD(&xcopy_pt_tpg.acl_node_list);
471 INIT_LIST_HEAD(&xcopy_pt_tpg.tpg_sess_list);
472
473 xcopy_pt_port.sep_tpg = &xcopy_pt_tpg;
474 xcopy_pt_tpg.se_tpg_tfo = &xcopy_pt_tfo;
475
476 memset(&xcopy_pt_nacl, 0, sizeof(struct se_node_acl));
477 INIT_LIST_HEAD(&xcopy_pt_nacl.acl_list);
478 INIT_LIST_HEAD(&xcopy_pt_nacl.acl_sess_list);
479 memset(&xcopy_pt_sess, 0, sizeof(struct se_session));
480 INIT_LIST_HEAD(&xcopy_pt_sess.sess_list);
481 INIT_LIST_HEAD(&xcopy_pt_sess.sess_acl_list);
482
483 xcopy_pt_nacl.se_tpg = &xcopy_pt_tpg;
484 xcopy_pt_nacl.nacl_sess = &xcopy_pt_sess;
485
486 xcopy_pt_sess.se_tpg = &xcopy_pt_tpg;
487 xcopy_pt_sess.se_node_acl = &xcopy_pt_nacl;
488
489 return 0;
490 }
491
492 void target_xcopy_release_pt(void)
493 {
494 if (xcopy_wq)
495 destroy_workqueue(xcopy_wq);
496 }
497
498 static void target_xcopy_setup_pt_port(
499 struct xcopy_pt_cmd *xpt_cmd,
500 struct xcopy_op *xop,
501 bool remote_port)
502 {
503 struct se_cmd *ec_cmd = xop->xop_se_cmd;
504 struct se_cmd *pt_cmd = &xpt_cmd->se_cmd;
505
506 if (xop->op_origin == XCOL_SOURCE_RECV_OP) {
507 /*
508 * Honor destination port reservations for X-COPY PUSH emulation
509 * when CDB is received on local source port, and READs blocks to
510 * WRITE on remote destination port.
511 */
512 if (remote_port) {
513 xpt_cmd->remote_port = remote_port;
514 pt_cmd->se_lun->lun_sep = &xcopy_pt_port;
515 pr_debug("Setup emulated remote DEST xcopy_pt_port: %p to"
516 " cmd->se_lun->lun_sep for X-COPY data PUSH\n",
517 pt_cmd->se_lun->lun_sep);
518 } else {
519 pt_cmd->se_lun = ec_cmd->se_lun;
520 pt_cmd->se_dev = ec_cmd->se_dev;
521
522 pr_debug("Honoring local SRC port from ec_cmd->se_dev:"
523 " %p\n", pt_cmd->se_dev);
524 pt_cmd->se_lun = ec_cmd->se_lun;
525 pr_debug("Honoring local SRC port from ec_cmd->se_lun: %p\n",
526 pt_cmd->se_lun);
527 }
528 } else {
529 /*
530 * Honor source port reservation for X-COPY PULL emulation
531 * when CDB is received on local desintation port, and READs
532 * blocks from the remote source port to WRITE on local
533 * destination port.
534 */
535 if (remote_port) {
536 xpt_cmd->remote_port = remote_port;
537 pt_cmd->se_lun->lun_sep = &xcopy_pt_port;
538 pr_debug("Setup emulated remote SRC xcopy_pt_port: %p to"
539 " cmd->se_lun->lun_sep for X-COPY data PULL\n",
540 pt_cmd->se_lun->lun_sep);
541 } else {
542 pt_cmd->se_lun = ec_cmd->se_lun;
543 pt_cmd->se_dev = ec_cmd->se_dev;
544
545 pr_debug("Honoring local DST port from ec_cmd->se_dev:"
546 " %p\n", pt_cmd->se_dev);
547 pt_cmd->se_lun = ec_cmd->se_lun;
548 pr_debug("Honoring local DST port from ec_cmd->se_lun: %p\n",
549 pt_cmd->se_lun);
550 }
551 }
552 }
553
554 static int target_xcopy_init_pt_lun(
555 struct xcopy_pt_cmd *xpt_cmd,
556 struct xcopy_op *xop,
557 struct se_device *se_dev,
558 struct se_cmd *pt_cmd,
559 bool remote_port)
560 {
561 /*
562 * Don't allocate + init an pt_cmd->se_lun if honoring local port for
563 * reservations. The pt_cmd->se_lun pointer will be setup from within
564 * target_xcopy_setup_pt_port()
565 */
566 if (remote_port == false) {
567 pt_cmd->se_cmd_flags |= SCF_SE_LUN_CMD | SCF_CMD_XCOPY_PASSTHROUGH;
568 return 0;
569 }
570
571 pt_cmd->se_lun = kzalloc(sizeof(struct se_lun), GFP_KERNEL);
572 if (!pt_cmd->se_lun) {
573 pr_err("Unable to allocate pt_cmd->se_lun\n");
574 return -ENOMEM;
575 }
576 init_completion(&pt_cmd->se_lun->lun_shutdown_comp);
577 INIT_LIST_HEAD(&pt_cmd->se_lun->lun_cmd_list);
578 INIT_LIST_HEAD(&pt_cmd->se_lun->lun_acl_list);
579 spin_lock_init(&pt_cmd->se_lun->lun_acl_lock);
580 spin_lock_init(&pt_cmd->se_lun->lun_cmd_lock);
581 spin_lock_init(&pt_cmd->se_lun->lun_sep_lock);
582 init_completion(&pt_cmd->se_lun->lun_ref_comp);
583
584 pt_cmd->se_dev = se_dev;
585
586 pr_debug("Setup emulated se_dev: %p from se_dev\n", pt_cmd->se_dev);
587 pt_cmd->se_lun->lun_se_dev = se_dev;
588 pt_cmd->se_cmd_flags |= SCF_SE_LUN_CMD | SCF_CMD_XCOPY_PASSTHROUGH;
589
590 pr_debug("Setup emulated se_dev: %p to pt_cmd->se_lun->lun_se_dev\n",
591 pt_cmd->se_lun->lun_se_dev);
592
593 return 0;
594 }
595
596 static int target_xcopy_setup_pt_cmd(
597 struct xcopy_pt_cmd *xpt_cmd,
598 struct xcopy_op *xop,
599 struct se_device *se_dev,
600 unsigned char *cdb,
601 bool remote_port,
602 bool alloc_mem)
603 {
604 struct se_cmd *cmd = &xpt_cmd->se_cmd;
605 sense_reason_t sense_rc;
606 int ret = 0, rc;
607 /*
608 * Setup LUN+port to honor reservations based upon xop->op_origin for
609 * X-COPY PUSH or X-COPY PULL based upon where the CDB was received.
610 */
611 rc = target_xcopy_init_pt_lun(xpt_cmd, xop, se_dev, cmd, remote_port);
612 if (rc < 0) {
613 ret = rc;
614 goto out;
615 }
616 xpt_cmd->xcopy_op = xop;
617 target_xcopy_setup_pt_port(xpt_cmd, xop, remote_port);
618
619 sense_rc = target_setup_cmd_from_cdb(cmd, cdb);
620 if (sense_rc) {
621 ret = -EINVAL;
622 goto out;
623 }
624
625 if (alloc_mem) {
626 rc = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
627 cmd->data_length, false);
628 if (rc < 0) {
629 ret = rc;
630 goto out;
631 }
632 /*
633 * Set this bit so that transport_free_pages() allows the
634 * caller to release SGLs + physical memory allocated by
635 * transport_generic_get_mem()..
636 */
637 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
638 } else {
639 /*
640 * Here the previously allocated SGLs for the internal READ
641 * are mapped zero-copy to the internal WRITE.
642 */
643 sense_rc = transport_generic_map_mem_to_cmd(cmd,
644 xop->xop_data_sg, xop->xop_data_nents,
645 NULL, 0);
646 if (sense_rc) {
647 ret = -EINVAL;
648 goto out;
649 }
650
651 pr_debug("Setup PASSTHROUGH_NOALLOC t_data_sg: %p t_data_nents:"
652 " %u\n", cmd->t_data_sg, cmd->t_data_nents);
653 }
654
655 return 0;
656
657 out:
658 if (remote_port == true)
659 kfree(cmd->se_lun);
660 return ret;
661 }
662
663 static int target_xcopy_issue_pt_cmd(struct xcopy_pt_cmd *xpt_cmd)
664 {
665 struct se_cmd *se_cmd = &xpt_cmd->se_cmd;
666 sense_reason_t sense_rc;
667
668 sense_rc = transport_generic_new_cmd(se_cmd);
669 if (sense_rc)
670 return -EINVAL;
671
672 if (se_cmd->data_direction == DMA_TO_DEVICE)
673 target_execute_cmd(se_cmd);
674
675 wait_for_completion_interruptible(&xpt_cmd->xpt_passthrough_sem);
676
677 pr_debug("target_xcopy_issue_pt_cmd(): SCSI status: 0x%02x\n",
678 se_cmd->scsi_status);
679 return 0;
680 }
681
682 static int target_xcopy_read_source(
683 struct se_cmd *ec_cmd,
684 struct xcopy_op *xop,
685 struct se_device *src_dev,
686 sector_t src_lba,
687 u32 src_sectors)
688 {
689 struct xcopy_pt_cmd *xpt_cmd;
690 struct se_cmd *se_cmd;
691 u32 length = (src_sectors * src_dev->dev_attrib.block_size);
692 int rc;
693 unsigned char cdb[16];
694 bool remote_port = (xop->op_origin == XCOL_DEST_RECV_OP);
695
696 xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL);
697 if (!xpt_cmd) {
698 pr_err("Unable to allocate xcopy_pt_cmd\n");
699 return -ENOMEM;
700 }
701 init_completion(&xpt_cmd->xpt_passthrough_sem);
702 se_cmd = &xpt_cmd->se_cmd;
703
704 memset(&cdb[0], 0, 16);
705 cdb[0] = READ_16;
706 put_unaligned_be64(src_lba, &cdb[2]);
707 put_unaligned_be32(src_sectors, &cdb[10]);
708 pr_debug("XCOPY: Built READ_16: LBA: %llu Sectors: %u Length: %u\n",
709 (unsigned long long)src_lba, src_sectors, length);
710
711 transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, NULL, length,
712 DMA_FROM_DEVICE, 0, NULL);
713 xop->src_pt_cmd = xpt_cmd;
714
715 rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, src_dev, &cdb[0],
716 remote_port, true);
717 if (rc < 0) {
718 transport_generic_free_cmd(se_cmd, 0);
719 return rc;
720 }
721
722 xop->xop_data_sg = se_cmd->t_data_sg;
723 xop->xop_data_nents = se_cmd->t_data_nents;
724 pr_debug("XCOPY-READ: Saved xop->xop_data_sg: %p, num: %u for READ"
725 " memory\n", xop->xop_data_sg, xop->xop_data_nents);
726
727 rc = target_xcopy_issue_pt_cmd(xpt_cmd);
728 if (rc < 0) {
729 transport_generic_free_cmd(se_cmd, 0);
730 return rc;
731 }
732 /*
733 * Clear off the allocated t_data_sg, that has been saved for
734 * zero-copy WRITE submission reuse in struct xcopy_op..
735 */
736 se_cmd->t_data_sg = NULL;
737 se_cmd->t_data_nents = 0;
738
739 return 0;
740 }
741
742 static int target_xcopy_write_destination(
743 struct se_cmd *ec_cmd,
744 struct xcopy_op *xop,
745 struct se_device *dst_dev,
746 sector_t dst_lba,
747 u32 dst_sectors)
748 {
749 struct xcopy_pt_cmd *xpt_cmd;
750 struct se_cmd *se_cmd;
751 u32 length = (dst_sectors * dst_dev->dev_attrib.block_size);
752 int rc;
753 unsigned char cdb[16];
754 bool remote_port = (xop->op_origin == XCOL_SOURCE_RECV_OP);
755
756 xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL);
757 if (!xpt_cmd) {
758 pr_err("Unable to allocate xcopy_pt_cmd\n");
759 return -ENOMEM;
760 }
761 init_completion(&xpt_cmd->xpt_passthrough_sem);
762 se_cmd = &xpt_cmd->se_cmd;
763
764 memset(&cdb[0], 0, 16);
765 cdb[0] = WRITE_16;
766 put_unaligned_be64(dst_lba, &cdb[2]);
767 put_unaligned_be32(dst_sectors, &cdb[10]);
768 pr_debug("XCOPY: Built WRITE_16: LBA: %llu Sectors: %u Length: %u\n",
769 (unsigned long long)dst_lba, dst_sectors, length);
770
771 transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, NULL, length,
772 DMA_TO_DEVICE, 0, NULL);
773 xop->dst_pt_cmd = xpt_cmd;
774
775 rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, dst_dev, &cdb[0],
776 remote_port, false);
777 if (rc < 0) {
778 struct se_cmd *src_cmd = &xop->src_pt_cmd->se_cmd;
779 /*
780 * If the failure happened before the t_mem_list hand-off in
781 * target_xcopy_setup_pt_cmd(), Reset memory + clear flag so that
782 * core releases this memory on error during X-COPY WRITE I/O.
783 */
784 src_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
785 src_cmd->t_data_sg = xop->xop_data_sg;
786 src_cmd->t_data_nents = xop->xop_data_nents;
787
788 transport_generic_free_cmd(se_cmd, 0);
789 return rc;
790 }
791
792 rc = target_xcopy_issue_pt_cmd(xpt_cmd);
793 if (rc < 0) {
794 se_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
795 transport_generic_free_cmd(se_cmd, 0);
796 return rc;
797 }
798
799 return 0;
800 }
801
802 static void target_xcopy_do_work(struct work_struct *work)
803 {
804 struct xcopy_op *xop = container_of(work, struct xcopy_op, xop_work);
805 struct se_device *src_dev = xop->src_dev, *dst_dev = xop->dst_dev;
806 struct se_cmd *ec_cmd = xop->xop_se_cmd;
807 sector_t src_lba = xop->src_lba, dst_lba = xop->dst_lba, end_lba;
808 unsigned int max_sectors;
809 int rc;
810 unsigned short nolb = xop->nolb, cur_nolb, max_nolb, copied_nolb = 0;
811
812 end_lba = src_lba + nolb;
813 /*
814 * Break up XCOPY I/O into hw_max_sectors sized I/O based on the
815 * smallest max_sectors between src_dev + dev_dev, or
816 */
817 max_sectors = min(src_dev->dev_attrib.hw_max_sectors,
818 dst_dev->dev_attrib.hw_max_sectors);
819 max_sectors = min_t(u32, max_sectors, XCOPY_MAX_SECTORS);
820
821 max_nolb = min_t(u16, max_sectors, ((u16)(~0U)));
822
823 pr_debug("target_xcopy_do_work: nolb: %hu, max_nolb: %hu end_lba: %llu\n",
824 nolb, max_nolb, (unsigned long long)end_lba);
825 pr_debug("target_xcopy_do_work: Starting src_lba: %llu, dst_lba: %llu\n",
826 (unsigned long long)src_lba, (unsigned long long)dst_lba);
827
828 while (src_lba < end_lba) {
829 cur_nolb = min(nolb, max_nolb);
830
831 pr_debug("target_xcopy_do_work: Calling read src_dev: %p src_lba: %llu,"
832 " cur_nolb: %hu\n", src_dev, (unsigned long long)src_lba, cur_nolb);
833
834 rc = target_xcopy_read_source(ec_cmd, xop, src_dev, src_lba, cur_nolb);
835 if (rc < 0)
836 goto out;
837
838 src_lba += cur_nolb;
839 pr_debug("target_xcopy_do_work: Incremented READ src_lba to %llu\n",
840 (unsigned long long)src_lba);
841
842 pr_debug("target_xcopy_do_work: Calling write dst_dev: %p dst_lba: %llu,"
843 " cur_nolb: %hu\n", dst_dev, (unsigned long long)dst_lba, cur_nolb);
844
845 rc = target_xcopy_write_destination(ec_cmd, xop, dst_dev,
846 dst_lba, cur_nolb);
847 if (rc < 0) {
848 transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0);
849 goto out;
850 }
851
852 dst_lba += cur_nolb;
853 pr_debug("target_xcopy_do_work: Incremented WRITE dst_lba to %llu\n",
854 (unsigned long long)dst_lba);
855
856 copied_nolb += cur_nolb;
857 nolb -= cur_nolb;
858
859 transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0);
860 xop->dst_pt_cmd->se_cmd.se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
861
862 transport_generic_free_cmd(&xop->dst_pt_cmd->se_cmd, 0);
863 }
864
865 xcopy_pt_undepend_remotedev(xop);
866 kfree(xop);
867
868 pr_debug("target_xcopy_do_work: Final src_lba: %llu, dst_lba: %llu\n",
869 (unsigned long long)src_lba, (unsigned long long)dst_lba);
870 pr_debug("target_xcopy_do_work: Blocks copied: %hu, Bytes Copied: %u\n",
871 copied_nolb, copied_nolb * dst_dev->dev_attrib.block_size);
872
873 pr_debug("target_xcopy_do_work: Setting X-COPY GOOD status -> sending response\n");
874 target_complete_cmd(ec_cmd, SAM_STAT_GOOD);
875 return;
876
877 out:
878 xcopy_pt_undepend_remotedev(xop);
879 kfree(xop);
880
881 pr_warn("target_xcopy_do_work: Setting X-COPY CHECK_CONDITION -> sending response\n");
882 ec_cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
883 target_complete_cmd(ec_cmd, SAM_STAT_CHECK_CONDITION);
884 }
885
886 sense_reason_t target_do_xcopy(struct se_cmd *se_cmd)
887 {
888 struct xcopy_op *xop = NULL;
889 unsigned char *p = NULL, *seg_desc;
890 unsigned int list_id, list_id_usage, sdll, inline_dl, sa;
891 int rc;
892 unsigned short tdll;
893
894 sa = se_cmd->t_task_cdb[1] & 0x1f;
895 if (sa != 0x00) {
896 pr_err("EXTENDED_COPY(LID4) not supported\n");
897 return TCM_UNSUPPORTED_SCSI_OPCODE;
898 }
899
900 p = transport_kmap_data_sg(se_cmd);
901 if (!p) {
902 pr_err("transport_kmap_data_sg() failed in target_do_xcopy\n");
903 return TCM_OUT_OF_RESOURCES;
904 }
905
906 list_id = p[0];
907 if (list_id != 0x00) {
908 pr_err("XCOPY with non zero list_id: 0x%02x\n", list_id);
909 goto out;
910 }
911 list_id_usage = (p[1] & 0x18);
912 /*
913 * Determine TARGET DESCRIPTOR LIST LENGTH + SEGMENT DESCRIPTOR LIST LENGTH
914 */
915 tdll = get_unaligned_be16(&p[2]);
916 sdll = get_unaligned_be32(&p[8]);
917
918 inline_dl = get_unaligned_be32(&p[12]);
919 if (inline_dl != 0) {
920 pr_err("XCOPY with non zero inline data length\n");
921 goto out;
922 }
923
924 xop = kzalloc(sizeof(struct xcopy_op), GFP_KERNEL);
925 if (!xop) {
926 pr_err("Unable to allocate xcopy_op\n");
927 goto out;
928 }
929 xop->xop_se_cmd = se_cmd;
930
931 pr_debug("Processing XCOPY with list_id: 0x%02x list_id_usage: 0x%02x"
932 " tdll: %hu sdll: %u inline_dl: %u\n", list_id, list_id_usage,
933 tdll, sdll, inline_dl);
934
935 rc = target_xcopy_parse_target_descriptors(se_cmd, xop, &p[16], tdll);
936 if (rc <= 0)
937 goto out;
938
939 pr_debug("XCOPY: Processed %d target descriptors, length: %u\n", rc,
940 rc * XCOPY_TARGET_DESC_LEN);
941 seg_desc = &p[16];
942 seg_desc += (rc * XCOPY_TARGET_DESC_LEN);
943
944 rc = target_xcopy_parse_segment_descriptors(se_cmd, xop, seg_desc, sdll);
945 if (rc <= 0) {
946 xcopy_pt_undepend_remotedev(xop);
947 goto out;
948 }
949 transport_kunmap_data_sg(se_cmd);
950
951 pr_debug("XCOPY: Processed %d segment descriptors, length: %u\n", rc,
952 rc * XCOPY_SEGMENT_DESC_LEN);
953 INIT_WORK(&xop->xop_work, target_xcopy_do_work);
954 queue_work(xcopy_wq, &xop->xop_work);
955 return TCM_NO_SENSE;
956
957 out:
958 if (p)
959 transport_kunmap_data_sg(se_cmd);
960 kfree(xop);
961 return TCM_INVALID_CDB_FIELD;
962 }
963
964 static sense_reason_t target_rcr_operating_parameters(struct se_cmd *se_cmd)
965 {
966 unsigned char *p;
967
968 p = transport_kmap_data_sg(se_cmd);
969 if (!p) {
970 pr_err("transport_kmap_data_sg failed in"
971 " target_rcr_operating_parameters\n");
972 return TCM_OUT_OF_RESOURCES;
973 }
974
975 if (se_cmd->data_length < 54) {
976 pr_err("Receive Copy Results Op Parameters length"
977 " too small: %u\n", se_cmd->data_length);
978 transport_kunmap_data_sg(se_cmd);
979 return TCM_INVALID_CDB_FIELD;
980 }
981 /*
982 * Set SNLID=1 (Supports no List ID)
983 */
984 p[4] = 0x1;
985 /*
986 * MAXIMUM TARGET DESCRIPTOR COUNT
987 */
988 put_unaligned_be16(RCR_OP_MAX_TARGET_DESC_COUNT, &p[8]);
989 /*
990 * MAXIMUM SEGMENT DESCRIPTOR COUNT
991 */
992 put_unaligned_be16(RCR_OP_MAX_SG_DESC_COUNT, &p[10]);
993 /*
994 * MAXIMUM DESCRIPTOR LIST LENGTH
995 */
996 put_unaligned_be32(RCR_OP_MAX_DESC_LIST_LEN, &p[12]);
997 /*
998 * MAXIMUM SEGMENT LENGTH
999 */
1000 put_unaligned_be32(RCR_OP_MAX_SEGMENT_LEN, &p[16]);
1001 /*
1002 * MAXIMUM INLINE DATA LENGTH for SA 0x04 (NOT SUPPORTED)
1003 */
1004 put_unaligned_be32(0x0, &p[20]);
1005 /*
1006 * HELD DATA LIMIT
1007 */
1008 put_unaligned_be32(0x0, &p[24]);
1009 /*
1010 * MAXIMUM STREAM DEVICE TRANSFER SIZE
1011 */
1012 put_unaligned_be32(0x0, &p[28]);
1013 /*
1014 * TOTAL CONCURRENT COPIES
1015 */
1016 put_unaligned_be16(RCR_OP_TOTAL_CONCURR_COPIES, &p[34]);
1017 /*
1018 * MAXIMUM CONCURRENT COPIES
1019 */
1020 p[36] = RCR_OP_MAX_CONCURR_COPIES;
1021 /*
1022 * DATA SEGMENT GRANULARITY (log 2)
1023 */
1024 p[37] = RCR_OP_DATA_SEG_GRAN_LOG2;
1025 /*
1026 * INLINE DATA GRANULARITY log 2)
1027 */
1028 p[38] = RCR_OP_INLINE_DATA_GRAN_LOG2;
1029 /*
1030 * HELD DATA GRANULARITY
1031 */
1032 p[39] = RCR_OP_HELD_DATA_GRAN_LOG2;
1033 /*
1034 * IMPLEMENTED DESCRIPTOR LIST LENGTH
1035 */
1036 p[43] = 0x2;
1037 /*
1038 * List of implemented descriptor type codes (ordered)
1039 */
1040 p[44] = 0x02; /* Copy Block to Block device */
1041 p[45] = 0xe4; /* Identification descriptor target descriptor */
1042
1043 /*
1044 * AVAILABLE DATA (n-3)
1045 */
1046 put_unaligned_be32(42, &p[0]);
1047
1048 transport_kunmap_data_sg(se_cmd);
1049 target_complete_cmd(se_cmd, GOOD);
1050
1051 return TCM_NO_SENSE;
1052 }
1053
1054 sense_reason_t target_do_receive_copy_results(struct se_cmd *se_cmd)
1055 {
1056 unsigned char *cdb = &se_cmd->t_task_cdb[0];
1057 int sa = (cdb[1] & 0x1f), list_id = cdb[2];
1058 sense_reason_t rc = TCM_NO_SENSE;
1059
1060 pr_debug("Entering target_do_receive_copy_results: SA: 0x%02x, List ID:"
1061 " 0x%02x, AL: %u\n", sa, list_id, se_cmd->data_length);
1062
1063 if (list_id != 0) {
1064 pr_err("Receive Copy Results with non zero list identifier"
1065 " not supported\n");
1066 return TCM_INVALID_CDB_FIELD;
1067 }
1068
1069 switch (sa) {
1070 case RCR_SA_OPERATING_PARAMETERS:
1071 rc = target_rcr_operating_parameters(se_cmd);
1072 break;
1073 case RCR_SA_COPY_STATUS:
1074 case RCR_SA_RECEIVE_DATA:
1075 case RCR_SA_FAILED_SEGMENT_DETAILS:
1076 default:
1077 pr_err("Unsupported SA for receive copy results: 0x%02x\n", sa);
1078 return TCM_INVALID_CDB_FIELD;
1079 }
1080
1081 return rc;
1082 }
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