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mm/mempolicy: correct putback method for isolate pages if failed
[linux/fpc-iii.git] / drivers / target / target_core_xcopy.c
blob6b88a9958f6126ab9267cc1c23e97dd8e59b5a57
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 if (!se_dev->dev_attrib.emulate_3pc)
86 continue;
87
88 memset(&tmp_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN);
89 target_xcopy_gen_naa_ieee(se_dev, &tmp_dev_wwn[0]);
90
91 rc = memcmp(&tmp_dev_wwn[0], dev_wwn, XCOPY_NAA_IEEE_REGEX_LEN);
92 if (rc != 0)
93 continue;
94
95 if (src == true) {
96 xop->dst_dev = se_dev;
97 pr_debug("XCOPY 0xe4: Setting xop->dst_dev: %p from located"
98 " se_dev\n", xop->dst_dev);
99 } else {
100 xop->src_dev = se_dev;
101 pr_debug("XCOPY 0xe4: Setting xop->src_dev: %p from located"
102 " se_dev\n", xop->src_dev);
103 }
104
105 rc = configfs_depend_item(subsys,
106 &se_dev->dev_group.cg_item);
107 if (rc != 0) {
108 pr_err("configfs_depend_item attempt failed:"
109 " %d for se_dev: %p\n", rc, se_dev);
110 mutex_unlock(&g_device_mutex);
111 return rc;
112 }
113
114 pr_debug("Called configfs_depend_item for subsys: %p se_dev: %p"
115 " se_dev->se_dev_group: %p\n", subsys, se_dev,
116 &se_dev->dev_group);
117
118 mutex_unlock(&g_device_mutex);
119 return 0;
120 }
121 mutex_unlock(&g_device_mutex);
122
123 pr_err("Unable to locate 0xe4 descriptor for EXTENDED_COPY\n");
124 return -EINVAL;
125 }
126
127 static int target_xcopy_parse_tiddesc_e4(struct se_cmd *se_cmd, struct xcopy_op *xop,
128 unsigned char *p, bool src)
129 {
130 unsigned char *desc = p;
131 unsigned short ript;
132 u8 desig_len;
133 /*
134 * Extract RELATIVE INITIATOR PORT IDENTIFIER
135 */
136 ript = get_unaligned_be16(&desc[2]);
137 pr_debug("XCOPY 0xe4: RELATIVE INITIATOR PORT IDENTIFIER: %hu\n", ript);
138 /*
139 * Check for supported code set, association, and designator type
140 */
141 if ((desc[4] & 0x0f) != 0x1) {
142 pr_err("XCOPY 0xe4: code set of non binary type not supported\n");
143 return -EINVAL;
144 }
145 if ((desc[5] & 0x30) != 0x00) {
146 pr_err("XCOPY 0xe4: association other than LUN not supported\n");
147 return -EINVAL;
148 }
149 if ((desc[5] & 0x0f) != 0x3) {
150 pr_err("XCOPY 0xe4: designator type unsupported: 0x%02x\n",
151 (desc[5] & 0x0f));
152 return -EINVAL;
153 }
154 /*
155 * Check for matching 16 byte length for NAA IEEE Registered Extended
156 * Assigned designator
157 */
158 desig_len = desc[7];
159 if (desig_len != 16) {
160 pr_err("XCOPY 0xe4: invalid desig_len: %d\n", (int)desig_len);
161 return -EINVAL;
162 }
163 pr_debug("XCOPY 0xe4: desig_len: %d\n", (int)desig_len);
164 /*
165 * Check for NAA IEEE Registered Extended Assigned header..
166 */
167 if ((desc[8] & 0xf0) != 0x60) {
168 pr_err("XCOPY 0xe4: Unsupported DESIGNATOR TYPE: 0x%02x\n",
169 (desc[8] & 0xf0));
170 return -EINVAL;
171 }
172
173 if (src == true) {
174 memcpy(&xop->src_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN);
175 /*
176 * Determine if the source designator matches the local device
177 */
178 if (!memcmp(&xop->local_dev_wwn[0], &xop->src_tid_wwn[0],
179 XCOPY_NAA_IEEE_REGEX_LEN)) {
180 xop->op_origin = XCOL_SOURCE_RECV_OP;
181 xop->src_dev = se_cmd->se_dev;
182 pr_debug("XCOPY 0xe4: Set xop->src_dev %p from source"
183 " received xop\n", xop->src_dev);
184 }
185 } else {
186 memcpy(&xop->dst_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN);
187 /*
188 * Determine if the destination designator matches the local device
189 */
190 if (!memcmp(&xop->local_dev_wwn[0], &xop->dst_tid_wwn[0],
191 XCOPY_NAA_IEEE_REGEX_LEN)) {
192 xop->op_origin = XCOL_DEST_RECV_OP;
193 xop->dst_dev = se_cmd->se_dev;
194 pr_debug("XCOPY 0xe4: Set xop->dst_dev: %p from destination"
195 " received xop\n", xop->dst_dev);
196 }
197 }
198
199 return 0;
200 }
201
202 static int target_xcopy_parse_target_descriptors(struct se_cmd *se_cmd,
203 struct xcopy_op *xop, unsigned char *p,
204 unsigned short tdll)
205 {
206 struct se_device *local_dev = se_cmd->se_dev;
207 unsigned char *desc = p;
208 int offset = tdll % XCOPY_TARGET_DESC_LEN, rc, ret = 0;
209 unsigned short start = 0;
210 bool src = true;
211
212 if (offset != 0) {
213 pr_err("XCOPY target descriptor list length is not"
214 " multiple of %d\n", XCOPY_TARGET_DESC_LEN);
215 return -EINVAL;
216 }
217 if (tdll > 64) {
218 pr_err("XCOPY target descriptor supports a maximum"
219 " two src/dest descriptors, tdll: %hu too large..\n", tdll);
220 return -EINVAL;
221 }
222 /*
223 * Generate an IEEE Registered Extended designator based upon the
224 * se_device the XCOPY was received upon..
225 */
226 memset(&xop->local_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN);
227 target_xcopy_gen_naa_ieee(local_dev, &xop->local_dev_wwn[0]);
228
229 while (start < tdll) {
230 /*
231 * Check target descriptor identification with 0xE4 type with
232 * use VPD 0x83 WWPN matching ..
233 */
234 switch (desc[0]) {
235 case 0xe4:
236 rc = target_xcopy_parse_tiddesc_e4(se_cmd, xop,
237 &desc[0], src);
238 if (rc != 0)
239 goto out;
240 /*
241 * Assume target descriptors are in source -> destination order..
242 */
243 if (src == true)
244 src = false;
245 else
246 src = true;
247 start += XCOPY_TARGET_DESC_LEN;
248 desc += XCOPY_TARGET_DESC_LEN;
249 ret++;
250 break;
251 default:
252 pr_err("XCOPY unsupported descriptor type code:"
253 " 0x%02x\n", desc[0]);
254 goto out;
255 }
256 }
257
258 if (xop->op_origin == XCOL_SOURCE_RECV_OP)
259 rc = target_xcopy_locate_se_dev_e4(se_cmd, xop, true);
260 else
261 rc = target_xcopy_locate_se_dev_e4(se_cmd, xop, false);
262
263 if (rc < 0)
264 goto out;
265
266 pr_debug("XCOPY TGT desc: Source dev: %p NAA IEEE WWN: 0x%16phN\n",
267 xop->src_dev, &xop->src_tid_wwn[0]);
268 pr_debug("XCOPY TGT desc: Dest dev: %p NAA IEEE WWN: 0x%16phN\n",
269 xop->dst_dev, &xop->dst_tid_wwn[0]);
270
271 return ret;
272
273 out:
274 return -EINVAL;
275 }
276
277 static int target_xcopy_parse_segdesc_02(struct se_cmd *se_cmd, struct xcopy_op *xop,
278 unsigned char *p)
279 {
280 unsigned char *desc = p;
281 int dc = (desc[1] & 0x02);
282 unsigned short desc_len;
283
284 desc_len = get_unaligned_be16(&desc[2]);
285 if (desc_len != 0x18) {
286 pr_err("XCOPY segment desc 0x02: Illegal desc_len:"
287 " %hu\n", desc_len);
288 return -EINVAL;
289 }
290
291 xop->stdi = get_unaligned_be16(&desc[4]);
292 xop->dtdi = get_unaligned_be16(&desc[6]);
293 pr_debug("XCOPY seg desc 0x02: desc_len: %hu stdi: %hu dtdi: %hu, DC: %d\n",
294 desc_len, xop->stdi, xop->dtdi, dc);
295
296 xop->nolb = get_unaligned_be16(&desc[10]);
297 xop->src_lba = get_unaligned_be64(&desc[12]);
298 xop->dst_lba = get_unaligned_be64(&desc[20]);
299 pr_debug("XCOPY seg desc 0x02: nolb: %hu src_lba: %llu dst_lba: %llu\n",
300 xop->nolb, (unsigned long long)xop->src_lba,
301 (unsigned long long)xop->dst_lba);
302
303 if (dc != 0) {
304 xop->dbl = (desc[29] & 0xff) << 16;
305 xop->dbl |= (desc[30] & 0xff) << 8;
306 xop->dbl |= desc[31] & 0xff;
307
308 pr_debug("XCOPY seg desc 0x02: DC=1 w/ dbl: %u\n", xop->dbl);
309 }
310 return 0;
311 }
312
313 static int target_xcopy_parse_segment_descriptors(struct se_cmd *se_cmd,
314 struct xcopy_op *xop, unsigned char *p,
315 unsigned int sdll)
316 {
317 unsigned char *desc = p;
318 unsigned int start = 0;
319 int offset = sdll % XCOPY_SEGMENT_DESC_LEN, rc, ret = 0;
320
321 if (offset != 0) {
322 pr_err("XCOPY segment descriptor list length is not"
323 " multiple of %d\n", XCOPY_SEGMENT_DESC_LEN);
324 return -EINVAL;
325 }
326
327 while (start < sdll) {
328 /*
329 * Check segment descriptor type code for block -> block
330 */
331 switch (desc[0]) {
332 case 0x02:
333 rc = target_xcopy_parse_segdesc_02(se_cmd, xop, desc);
334 if (rc < 0)
335 goto out;
336
337 ret++;
338 start += XCOPY_SEGMENT_DESC_LEN;
339 desc += XCOPY_SEGMENT_DESC_LEN;
340 break;
341 default:
342 pr_err("XCOPY unspported segment descriptor"
343 "type: 0x%02x\n", desc[0]);
344 goto out;
345 }
346 }
347
348 return ret;
349
350 out:
351 return -EINVAL;
352 }
353
354 /*
355 * Start xcopy_pt ops
356 */
357
358 struct xcopy_pt_cmd {
359 bool remote_port;
360 struct se_cmd se_cmd;
361 struct xcopy_op *xcopy_op;
362 struct completion xpt_passthrough_sem;
363 unsigned char sense_buffer[TRANSPORT_SENSE_BUFFER];
364 };
365
366 static struct se_port xcopy_pt_port;
367 static struct se_portal_group xcopy_pt_tpg;
368 static struct se_session xcopy_pt_sess;
369 static struct se_node_acl xcopy_pt_nacl;
370
371 static char *xcopy_pt_get_fabric_name(void)
372 {
373 return "xcopy-pt";
374 }
375
376 static u32 xcopy_pt_get_tag(struct se_cmd *se_cmd)
377 {
378 return 0;
379 }
380
381 static int xcopy_pt_get_cmd_state(struct se_cmd *se_cmd)
382 {
383 return 0;
384 }
385
386 static void xcopy_pt_undepend_remotedev(struct xcopy_op *xop)
387 {
388 struct configfs_subsystem *subsys = target_core_subsystem[0];
389 struct se_device *remote_dev;
390
391 if (xop->op_origin == XCOL_SOURCE_RECV_OP)
392 remote_dev = xop->dst_dev;
393 else
394 remote_dev = xop->src_dev;
395
396 pr_debug("Calling configfs_undepend_item for subsys: %p"
397 " remote_dev: %p remote_dev->dev_group: %p\n",
398 subsys, remote_dev, &remote_dev->dev_group.cg_item);
399
400 configfs_undepend_item(subsys, &remote_dev->dev_group.cg_item);
401 }
402
403 static void xcopy_pt_release_cmd(struct se_cmd *se_cmd)
404 {
405 struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd,
406 struct xcopy_pt_cmd, se_cmd);
407
408 kfree(xpt_cmd);
409 }
410
411 static int xcopy_pt_check_stop_free(struct se_cmd *se_cmd)
412 {
413 struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd,
414 struct xcopy_pt_cmd, se_cmd);
415
416 complete(&xpt_cmd->xpt_passthrough_sem);
417 return 0;
418 }
419
420 static int xcopy_pt_write_pending(struct se_cmd *se_cmd)
421 {
422 return 0;
423 }
424
425 static int xcopy_pt_write_pending_status(struct se_cmd *se_cmd)
426 {
427 return 0;
428 }
429
430 static int xcopy_pt_queue_data_in(struct se_cmd *se_cmd)
431 {
432 return 0;
433 }
434
435 static int xcopy_pt_queue_status(struct se_cmd *se_cmd)
436 {
437 return 0;
438 }
439
440 static struct target_core_fabric_ops xcopy_pt_tfo = {
441 .get_fabric_name = xcopy_pt_get_fabric_name,
442 .get_task_tag = xcopy_pt_get_tag,
443 .get_cmd_state = xcopy_pt_get_cmd_state,
444 .release_cmd = xcopy_pt_release_cmd,
445 .check_stop_free = xcopy_pt_check_stop_free,
446 .write_pending = xcopy_pt_write_pending,
447 .write_pending_status = xcopy_pt_write_pending_status,
448 .queue_data_in = xcopy_pt_queue_data_in,
449 .queue_status = xcopy_pt_queue_status,
450 };
451
452 /*
453 * End xcopy_pt_ops
454 */
455
456 int target_xcopy_setup_pt(void)
457 {
458 xcopy_wq = alloc_workqueue("xcopy_wq", WQ_MEM_RECLAIM, 0);
459 if (!xcopy_wq) {
460 pr_err("Unable to allocate xcopy_wq\n");
461 return -ENOMEM;
462 }
463
464 memset(&xcopy_pt_port, 0, sizeof(struct se_port));
465 INIT_LIST_HEAD(&xcopy_pt_port.sep_alua_list);
466 INIT_LIST_HEAD(&xcopy_pt_port.sep_list);
467 mutex_init(&xcopy_pt_port.sep_tg_pt_md_mutex);
468
469 memset(&xcopy_pt_tpg, 0, sizeof(struct se_portal_group));
470 INIT_LIST_HEAD(&xcopy_pt_tpg.se_tpg_node);
471 INIT_LIST_HEAD(&xcopy_pt_tpg.acl_node_list);
472 INIT_LIST_HEAD(&xcopy_pt_tpg.tpg_sess_list);
473
474 xcopy_pt_port.sep_tpg = &xcopy_pt_tpg;
475 xcopy_pt_tpg.se_tpg_tfo = &xcopy_pt_tfo;
476
477 memset(&xcopy_pt_nacl, 0, sizeof(struct se_node_acl));
478 INIT_LIST_HEAD(&xcopy_pt_nacl.acl_list);
479 INIT_LIST_HEAD(&xcopy_pt_nacl.acl_sess_list);
480 memset(&xcopy_pt_sess, 0, sizeof(struct se_session));
481 INIT_LIST_HEAD(&xcopy_pt_sess.sess_list);
482 INIT_LIST_HEAD(&xcopy_pt_sess.sess_acl_list);
483
484 xcopy_pt_nacl.se_tpg = &xcopy_pt_tpg;
485 xcopy_pt_nacl.nacl_sess = &xcopy_pt_sess;
486
487 xcopy_pt_sess.se_tpg = &xcopy_pt_tpg;
488 xcopy_pt_sess.se_node_acl = &xcopy_pt_nacl;
489
490 return 0;
491 }
492
493 void target_xcopy_release_pt(void)
494 {
495 if (xcopy_wq)
496 destroy_workqueue(xcopy_wq);
497 }
498
499 static void target_xcopy_setup_pt_port(
500 struct xcopy_pt_cmd *xpt_cmd,
501 struct xcopy_op *xop,
502 bool remote_port)
503 {
504 struct se_cmd *ec_cmd = xop->xop_se_cmd;
505 struct se_cmd *pt_cmd = &xpt_cmd->se_cmd;
506
507 if (xop->op_origin == XCOL_SOURCE_RECV_OP) {
508 /*
509 * Honor destination port reservations for X-COPY PUSH emulation
510 * when CDB is received on local source port, and READs blocks to
511 * WRITE on remote destination port.
512 */
513 if (remote_port) {
514 xpt_cmd->remote_port = remote_port;
515 pt_cmd->se_lun->lun_sep = &xcopy_pt_port;
516 pr_debug("Setup emulated remote DEST xcopy_pt_port: %p to"
517 " cmd->se_lun->lun_sep for X-COPY data PUSH\n",
518 pt_cmd->se_lun->lun_sep);
519 } else {
520 pt_cmd->se_lun = ec_cmd->se_lun;
521 pt_cmd->se_dev = ec_cmd->se_dev;
522
523 pr_debug("Honoring local SRC port from ec_cmd->se_dev:"
524 " %p\n", pt_cmd->se_dev);
525 pt_cmd->se_lun = ec_cmd->se_lun;
526 pr_debug("Honoring local SRC port from ec_cmd->se_lun: %p\n",
527 pt_cmd->se_lun);
528 }
529 } else {
530 /*
531 * Honor source port reservation for X-COPY PULL emulation
532 * when CDB is received on local desintation port, and READs
533 * blocks from the remote source port to WRITE on local
534 * destination port.
535 */
536 if (remote_port) {
537 xpt_cmd->remote_port = remote_port;
538 pt_cmd->se_lun->lun_sep = &xcopy_pt_port;
539 pr_debug("Setup emulated remote SRC xcopy_pt_port: %p to"
540 " cmd->se_lun->lun_sep for X-COPY data PULL\n",
541 pt_cmd->se_lun->lun_sep);
542 } else {
543 pt_cmd->se_lun = ec_cmd->se_lun;
544 pt_cmd->se_dev = ec_cmd->se_dev;
545
546 pr_debug("Honoring local DST port from ec_cmd->se_dev:"
547 " %p\n", pt_cmd->se_dev);
548 pt_cmd->se_lun = ec_cmd->se_lun;
549 pr_debug("Honoring local DST port from ec_cmd->se_lun: %p\n",
550 pt_cmd->se_lun);
551 }
552 }
553 }
554
555 static int target_xcopy_init_pt_lun(
556 struct xcopy_pt_cmd *xpt_cmd,
557 struct xcopy_op *xop,
558 struct se_device *se_dev,
559 struct se_cmd *pt_cmd,
560 bool remote_port)
561 {
562 /*
563 * Don't allocate + init an pt_cmd->se_lun if honoring local port for
564 * reservations. The pt_cmd->se_lun pointer will be setup from within
565 * target_xcopy_setup_pt_port()
566 */
567 if (remote_port == false) {
568 pt_cmd->se_cmd_flags |= SCF_SE_LUN_CMD | SCF_CMD_XCOPY_PASSTHROUGH;
569 return 0;
570 }
571
572 pt_cmd->se_lun = &se_dev->xcopy_lun;
573 pt_cmd->se_dev = se_dev;
574
575 pr_debug("Setup emulated se_dev: %p from se_dev\n", pt_cmd->se_dev);
576 pt_cmd->se_cmd_flags |= SCF_SE_LUN_CMD | SCF_CMD_XCOPY_PASSTHROUGH;
577
578 pr_debug("Setup emulated se_dev: %p to pt_cmd->se_lun->lun_se_dev\n",
579 pt_cmd->se_lun->lun_se_dev);
580
581 return 0;
582 }
583
584 static int target_xcopy_setup_pt_cmd(
585 struct xcopy_pt_cmd *xpt_cmd,
586 struct xcopy_op *xop,
587 struct se_device *se_dev,
588 unsigned char *cdb,
589 bool remote_port,
590 bool alloc_mem)
591 {
592 struct se_cmd *cmd = &xpt_cmd->se_cmd;
593 sense_reason_t sense_rc;
594 int ret = 0, rc;
595 /*
596 * Setup LUN+port to honor reservations based upon xop->op_origin for
597 * X-COPY PUSH or X-COPY PULL based upon where the CDB was received.
598 */
599 rc = target_xcopy_init_pt_lun(xpt_cmd, xop, se_dev, cmd, remote_port);
600 if (rc < 0) {
601 ret = rc;
602 goto out;
603 }
604 xpt_cmd->xcopy_op = xop;
605 target_xcopy_setup_pt_port(xpt_cmd, xop, remote_port);
606
607 sense_rc = target_setup_cmd_from_cdb(cmd, cdb);
608 if (sense_rc) {
609 ret = -EINVAL;
610 goto out;
611 }
612
613 if (alloc_mem) {
614 rc = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
615 cmd->data_length, false);
616 if (rc < 0) {
617 ret = rc;
618 goto out;
619 }
620 /*
621 * Set this bit so that transport_free_pages() allows the
622 * caller to release SGLs + physical memory allocated by
623 * transport_generic_get_mem()..
624 */
625 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
626 } else {
627 /*
628 * Here the previously allocated SGLs for the internal READ
629 * are mapped zero-copy to the internal WRITE.
630 */
631 sense_rc = transport_generic_map_mem_to_cmd(cmd,
632 xop->xop_data_sg, xop->xop_data_nents,
633 NULL, 0);
634 if (sense_rc) {
635 ret = -EINVAL;
636 goto out;
637 }
638
639 pr_debug("Setup PASSTHROUGH_NOALLOC t_data_sg: %p t_data_nents:"
640 " %u\n", cmd->t_data_sg, cmd->t_data_nents);
641 }
642
643 return 0;
644
645 out:
646 return ret;
647 }
648
649 static int target_xcopy_issue_pt_cmd(struct xcopy_pt_cmd *xpt_cmd)
650 {
651 struct se_cmd *se_cmd = &xpt_cmd->se_cmd;
652 sense_reason_t sense_rc;
653
654 sense_rc = transport_generic_new_cmd(se_cmd);
655 if (sense_rc)
656 return -EINVAL;
657
658 if (se_cmd->data_direction == DMA_TO_DEVICE)
659 target_execute_cmd(se_cmd);
660
661 wait_for_completion_interruptible(&xpt_cmd->xpt_passthrough_sem);
662
663 pr_debug("target_xcopy_issue_pt_cmd(): SCSI status: 0x%02x\n",
664 se_cmd->scsi_status);
665
666 return (se_cmd->scsi_status) ? -EINVAL : 0;
667 }
668
669 static int target_xcopy_read_source(
670 struct se_cmd *ec_cmd,
671 struct xcopy_op *xop,
672 struct se_device *src_dev,
673 sector_t src_lba,
674 u32 src_sectors)
675 {
676 struct xcopy_pt_cmd *xpt_cmd;
677 struct se_cmd *se_cmd;
678 u32 length = (src_sectors * src_dev->dev_attrib.block_size);
679 int rc;
680 unsigned char cdb[16];
681 bool remote_port = (xop->op_origin == XCOL_DEST_RECV_OP);
682
683 xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL);
684 if (!xpt_cmd) {
685 pr_err("Unable to allocate xcopy_pt_cmd\n");
686 return -ENOMEM;
687 }
688 init_completion(&xpt_cmd->xpt_passthrough_sem);
689 se_cmd = &xpt_cmd->se_cmd;
690
691 memset(&cdb[0], 0, 16);
692 cdb[0] = READ_16;
693 put_unaligned_be64(src_lba, &cdb[2]);
694 put_unaligned_be32(src_sectors, &cdb[10]);
695 pr_debug("XCOPY: Built READ_16: LBA: %llu Sectors: %u Length: %u\n",
696 (unsigned long long)src_lba, src_sectors, length);
697
698 transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, NULL, length,
699 DMA_FROM_DEVICE, 0, &xpt_cmd->sense_buffer[0]);
700 xop->src_pt_cmd = xpt_cmd;
701
702 rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, src_dev, &cdb[0],
703 remote_port, true);
704 if (rc < 0) {
705 transport_generic_free_cmd(se_cmd, 0);
706 return rc;
707 }
708
709 xop->xop_data_sg = se_cmd->t_data_sg;
710 xop->xop_data_nents = se_cmd->t_data_nents;
711 pr_debug("XCOPY-READ: Saved xop->xop_data_sg: %p, num: %u for READ"
712 " memory\n", xop->xop_data_sg, xop->xop_data_nents);
713
714 rc = target_xcopy_issue_pt_cmd(xpt_cmd);
715 if (rc < 0) {
716 transport_generic_free_cmd(se_cmd, 0);
717 return rc;
718 }
719 /*
720 * Clear off the allocated t_data_sg, that has been saved for
721 * zero-copy WRITE submission reuse in struct xcopy_op..
722 */
723 se_cmd->t_data_sg = NULL;
724 se_cmd->t_data_nents = 0;
725
726 return 0;
727 }
728
729 static int target_xcopy_write_destination(
730 struct se_cmd *ec_cmd,
731 struct xcopy_op *xop,
732 struct se_device *dst_dev,
733 sector_t dst_lba,
734 u32 dst_sectors)
735 {
736 struct xcopy_pt_cmd *xpt_cmd;
737 struct se_cmd *se_cmd;
738 u32 length = (dst_sectors * dst_dev->dev_attrib.block_size);
739 int rc;
740 unsigned char cdb[16];
741 bool remote_port = (xop->op_origin == XCOL_SOURCE_RECV_OP);
742
743 xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL);
744 if (!xpt_cmd) {
745 pr_err("Unable to allocate xcopy_pt_cmd\n");
746 return -ENOMEM;
747 }
748 init_completion(&xpt_cmd->xpt_passthrough_sem);
749 se_cmd = &xpt_cmd->se_cmd;
750
751 memset(&cdb[0], 0, 16);
752 cdb[0] = WRITE_16;
753 put_unaligned_be64(dst_lba, &cdb[2]);
754 put_unaligned_be32(dst_sectors, &cdb[10]);
755 pr_debug("XCOPY: Built WRITE_16: LBA: %llu Sectors: %u Length: %u\n",
756 (unsigned long long)dst_lba, dst_sectors, length);
757
758 transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, NULL, length,
759 DMA_TO_DEVICE, 0, &xpt_cmd->sense_buffer[0]);
760 xop->dst_pt_cmd = xpt_cmd;
761
762 rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, dst_dev, &cdb[0],
763 remote_port, false);
764 if (rc < 0) {
765 struct se_cmd *src_cmd = &xop->src_pt_cmd->se_cmd;
766 /*
767 * If the failure happened before the t_mem_list hand-off in
768 * target_xcopy_setup_pt_cmd(), Reset memory + clear flag so that
769 * core releases this memory on error during X-COPY WRITE I/O.
770 */
771 src_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
772 src_cmd->t_data_sg = xop->xop_data_sg;
773 src_cmd->t_data_nents = xop->xop_data_nents;
774
775 transport_generic_free_cmd(se_cmd, 0);
776 return rc;
777 }
778
779 rc = target_xcopy_issue_pt_cmd(xpt_cmd);
780 if (rc < 0) {
781 se_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
782 transport_generic_free_cmd(se_cmd, 0);
783 return rc;
784 }
785
786 return 0;
787 }
788
789 static void target_xcopy_do_work(struct work_struct *work)
790 {
791 struct xcopy_op *xop = container_of(work, struct xcopy_op, xop_work);
792 struct se_device *src_dev = xop->src_dev, *dst_dev = xop->dst_dev;
793 struct se_cmd *ec_cmd = xop->xop_se_cmd;
794 sector_t src_lba = xop->src_lba, dst_lba = xop->dst_lba, end_lba;
795 unsigned int max_sectors;
796 int rc;
797 unsigned short nolb = xop->nolb, cur_nolb, max_nolb, copied_nolb = 0;
798
799 end_lba = src_lba + nolb;
800 /*
801 * Break up XCOPY I/O into hw_max_sectors sized I/O based on the
802 * smallest max_sectors between src_dev + dev_dev, or
803 */
804 max_sectors = min(src_dev->dev_attrib.hw_max_sectors,
805 dst_dev->dev_attrib.hw_max_sectors);
806 max_sectors = min_t(u32, max_sectors, XCOPY_MAX_SECTORS);
807
808 max_nolb = min_t(u16, max_sectors, ((u16)(~0U)));
809
810 pr_debug("target_xcopy_do_work: nolb: %hu, max_nolb: %hu end_lba: %llu\n",
811 nolb, max_nolb, (unsigned long long)end_lba);
812 pr_debug("target_xcopy_do_work: Starting src_lba: %llu, dst_lba: %llu\n",
813 (unsigned long long)src_lba, (unsigned long long)dst_lba);
814
815 while (src_lba < end_lba) {
816 cur_nolb = min(nolb, max_nolb);
817
818 pr_debug("target_xcopy_do_work: Calling read src_dev: %p src_lba: %llu,"
819 " cur_nolb: %hu\n", src_dev, (unsigned long long)src_lba, cur_nolb);
820
821 rc = target_xcopy_read_source(ec_cmd, xop, src_dev, src_lba, cur_nolb);
822 if (rc < 0)
823 goto out;
824
825 src_lba += cur_nolb;
826 pr_debug("target_xcopy_do_work: Incremented READ src_lba to %llu\n",
827 (unsigned long long)src_lba);
828
829 pr_debug("target_xcopy_do_work: Calling write dst_dev: %p dst_lba: %llu,"
830 " cur_nolb: %hu\n", dst_dev, (unsigned long long)dst_lba, cur_nolb);
831
832 rc = target_xcopy_write_destination(ec_cmd, xop, dst_dev,
833 dst_lba, cur_nolb);
834 if (rc < 0) {
835 transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0);
836 goto out;
837 }
838
839 dst_lba += cur_nolb;
840 pr_debug("target_xcopy_do_work: Incremented WRITE dst_lba to %llu\n",
841 (unsigned long long)dst_lba);
842
843 copied_nolb += cur_nolb;
844 nolb -= cur_nolb;
845
846 transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0);
847 xop->dst_pt_cmd->se_cmd.se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
848
849 transport_generic_free_cmd(&xop->dst_pt_cmd->se_cmd, 0);
850 }
851
852 xcopy_pt_undepend_remotedev(xop);
853 kfree(xop);
854
855 pr_debug("target_xcopy_do_work: Final src_lba: %llu, dst_lba: %llu\n",
856 (unsigned long long)src_lba, (unsigned long long)dst_lba);
857 pr_debug("target_xcopy_do_work: Blocks copied: %hu, Bytes Copied: %u\n",
858 copied_nolb, copied_nolb * dst_dev->dev_attrib.block_size);
859
860 pr_debug("target_xcopy_do_work: Setting X-COPY GOOD status -> sending response\n");
861 target_complete_cmd(ec_cmd, SAM_STAT_GOOD);
862 return;
863
864 out:
865 xcopy_pt_undepend_remotedev(xop);
866 kfree(xop);
867
868 pr_warn("target_xcopy_do_work: Setting X-COPY CHECK_CONDITION -> sending response\n");
869 ec_cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
870 target_complete_cmd(ec_cmd, SAM_STAT_CHECK_CONDITION);
871 }
872
873 sense_reason_t target_do_xcopy(struct se_cmd *se_cmd)
874 {
875 struct se_device *dev = se_cmd->se_dev;
876 struct xcopy_op *xop = NULL;
877 unsigned char *p = NULL, *seg_desc;
878 unsigned int list_id, list_id_usage, sdll, inline_dl, sa;
879 sense_reason_t ret = TCM_INVALID_PARAMETER_LIST;
880 int rc;
881 unsigned short tdll;
882
883 if (!dev->dev_attrib.emulate_3pc) {
884 pr_err("EXTENDED_COPY operation explicitly disabled\n");
885 return TCM_UNSUPPORTED_SCSI_OPCODE;
886 }
887
888 sa = se_cmd->t_task_cdb[1] & 0x1f;
889 if (sa != 0x00) {
890 pr_err("EXTENDED_COPY(LID4) not supported\n");
891 return TCM_UNSUPPORTED_SCSI_OPCODE;
892 }
893
894 xop = kzalloc(sizeof(struct xcopy_op), GFP_KERNEL);
895 if (!xop) {
896 pr_err("Unable to allocate xcopy_op\n");
897 return TCM_OUT_OF_RESOURCES;
898 }
899 xop->xop_se_cmd = se_cmd;
900
901 p = transport_kmap_data_sg(se_cmd);
902 if (!p) {
903 pr_err("transport_kmap_data_sg() failed in target_do_xcopy\n");
904 kfree(xop);
905 return TCM_OUT_OF_RESOURCES;
906 }
907
908 list_id = p[0];
909 list_id_usage = (p[1] & 0x18) >> 3;
910
911 /*
912 * Determine TARGET DESCRIPTOR LIST LENGTH + SEGMENT DESCRIPTOR LIST LENGTH
913 */
914 tdll = get_unaligned_be16(&p[2]);
915 sdll = get_unaligned_be32(&p[8]);
916
917 inline_dl = get_unaligned_be32(&p[12]);
918 if (inline_dl != 0) {
919 pr_err("XCOPY with non zero inline data length\n");
920 goto out;
921 }
922
923 pr_debug("Processing XCOPY with list_id: 0x%02x list_id_usage: 0x%02x"
924 " tdll: %hu sdll: %u inline_dl: %u\n", list_id, list_id_usage,
925 tdll, sdll, inline_dl);
926
927 rc = target_xcopy_parse_target_descriptors(se_cmd, xop, &p[16], tdll);
928 if (rc <= 0)
929 goto out;
930
931 if (xop->src_dev->dev_attrib.block_size !=
932 xop->dst_dev->dev_attrib.block_size) {
933 pr_err("XCOPY: Non matching src_dev block_size: %u + dst_dev"
934 " block_size: %u currently unsupported\n",
935 xop->src_dev->dev_attrib.block_size,
936 xop->dst_dev->dev_attrib.block_size);
937 xcopy_pt_undepend_remotedev(xop);
938 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
939 goto out;
940 }
941
942 pr_debug("XCOPY: Processed %d target descriptors, length: %u\n", rc,
943 rc * XCOPY_TARGET_DESC_LEN);
944 seg_desc = &p[16];
945 seg_desc += (rc * XCOPY_TARGET_DESC_LEN);
946
947 rc = target_xcopy_parse_segment_descriptors(se_cmd, xop, seg_desc, sdll);
948 if (rc <= 0) {
949 xcopy_pt_undepend_remotedev(xop);
950 goto out;
951 }
952 transport_kunmap_data_sg(se_cmd);
953
954 pr_debug("XCOPY: Processed %d segment descriptors, length: %u\n", rc,
955 rc * XCOPY_SEGMENT_DESC_LEN);
956 INIT_WORK(&xop->xop_work, target_xcopy_do_work);
957 queue_work(xcopy_wq, &xop->xop_work);
958 return TCM_NO_SENSE;
959
960 out:
961 if (p)
962 transport_kunmap_data_sg(se_cmd);
963 kfree(xop);
964 return ret;
965 }
966
967 static sense_reason_t target_rcr_operating_parameters(struct se_cmd *se_cmd)
968 {
969 unsigned char *p;
970
971 p = transport_kmap_data_sg(se_cmd);
972 if (!p) {
973 pr_err("transport_kmap_data_sg failed in"
974 " target_rcr_operating_parameters\n");
975 return TCM_OUT_OF_RESOURCES;
976 }
977
978 if (se_cmd->data_length < 54) {
979 pr_err("Receive Copy Results Op Parameters length"
980 " too small: %u\n", se_cmd->data_length);
981 transport_kunmap_data_sg(se_cmd);
982 return TCM_INVALID_CDB_FIELD;
983 }
984 /*
985 * Set SNLID=1 (Supports no List ID)
986 */
987 p[4] = 0x1;
988 /*
989 * MAXIMUM TARGET DESCRIPTOR COUNT
990 */
991 put_unaligned_be16(RCR_OP_MAX_TARGET_DESC_COUNT, &p[8]);
992 /*
993 * MAXIMUM SEGMENT DESCRIPTOR COUNT
994 */
995 put_unaligned_be16(RCR_OP_MAX_SG_DESC_COUNT, &p[10]);
996 /*
997 * MAXIMUM DESCRIPTOR LIST LENGTH
998 */
999 put_unaligned_be32(RCR_OP_MAX_DESC_LIST_LEN, &p[12]);
1000 /*
1001 * MAXIMUM SEGMENT LENGTH
1002 */
1003 put_unaligned_be32(RCR_OP_MAX_SEGMENT_LEN, &p[16]);
1004 /*
1005 * MAXIMUM INLINE DATA LENGTH for SA 0x04 (NOT SUPPORTED)
1006 */
1007 put_unaligned_be32(0x0, &p[20]);
1008 /*
1009 * HELD DATA LIMIT
1010 */
1011 put_unaligned_be32(0x0, &p[24]);
1012 /*
1013 * MAXIMUM STREAM DEVICE TRANSFER SIZE
1014 */
1015 put_unaligned_be32(0x0, &p[28]);
1016 /*
1017 * TOTAL CONCURRENT COPIES
1018 */
1019 put_unaligned_be16(RCR_OP_TOTAL_CONCURR_COPIES, &p[34]);
1020 /*
1021 * MAXIMUM CONCURRENT COPIES
1022 */
1023 p[36] = RCR_OP_MAX_CONCURR_COPIES;
1024 /*
1025 * DATA SEGMENT GRANULARITY (log 2)
1026 */
1027 p[37] = RCR_OP_DATA_SEG_GRAN_LOG2;
1028 /*
1029 * INLINE DATA GRANULARITY log 2)
1030 */
1031 p[38] = RCR_OP_INLINE_DATA_GRAN_LOG2;
1032 /*
1033 * HELD DATA GRANULARITY
1034 */
1035 p[39] = RCR_OP_HELD_DATA_GRAN_LOG2;
1036 /*
1037 * IMPLEMENTED DESCRIPTOR LIST LENGTH
1038 */
1039 p[43] = 0x2;
1040 /*
1041 * List of implemented descriptor type codes (ordered)
1042 */
1043 p[44] = 0x02; /* Copy Block to Block device */
1044 p[45] = 0xe4; /* Identification descriptor target descriptor */
1045
1046 /*
1047 * AVAILABLE DATA (n-3)
1048 */
1049 put_unaligned_be32(42, &p[0]);
1050
1051 transport_kunmap_data_sg(se_cmd);
1052 target_complete_cmd(se_cmd, GOOD);
1053
1054 return TCM_NO_SENSE;
1055 }
1056
1057 sense_reason_t target_do_receive_copy_results(struct se_cmd *se_cmd)
1058 {
1059 unsigned char *cdb = &se_cmd->t_task_cdb[0];
1060 int sa = (cdb[1] & 0x1f), list_id = cdb[2];
1061 sense_reason_t rc = TCM_NO_SENSE;
1062
1063 pr_debug("Entering target_do_receive_copy_results: SA: 0x%02x, List ID:"
1064 " 0x%02x, AL: %u\n", sa, list_id, se_cmd->data_length);
1065
1066 if (list_id != 0) {
1067 pr_err("Receive Copy Results with non zero list identifier"
1068 " not supported\n");
1069 return TCM_INVALID_CDB_FIELD;
1070 }
1071
1072 switch (sa) {
1073 case RCR_SA_OPERATING_PARAMETERS:
1074 rc = target_rcr_operating_parameters(se_cmd);
1075 break;
1076 case RCR_SA_COPY_STATUS:
1077 case RCR_SA_RECEIVE_DATA:
1078 case RCR_SA_FAILED_SEGMENT_DETAILS:
1079 default:
1080 pr_err("Unsupported SA for receive copy results: 0x%02x\n", sa);
1081 return TCM_INVALID_CDB_FIELD;
1082 }
1083
1084 return rc;
1085 }
Linux with added FPC-III support