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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
41static struct workqueue_struct *xcopy_wq = NULL;
42/*
43 * From target_core_device.c
44 */
45extern struct mutex g_device_mutex;
46extern struct list_head g_device_list;
47/*
48 * From target_core_configfs.c
49 */
50extern struct configfs_subsystem *target_core_subsystem[];
51
52static int target_xcopy_gen_naa_ieee(struct se_device *dev, unsigned char *buf)
53{
54 int off = 0;
55
56 buf[off++] = (0x6 << 4);
57 buf[off++] = 0x01;
58 buf[off++] = 0x40;
59 buf[off] = (0x5 << 4);
60
61 spc_parse_naa_6h_vendor_specific(dev, &buf[off]);
62 return 0;
63}
64
65static int target_xcopy_locate_se_dev_e4(struct se_cmd *se_cmd, struct xcopy_op *xop,
66 bool src)
67{
68 struct se_device *se_dev;
69 struct configfs_subsystem *subsys = target_core_subsystem[0];
70 unsigned char tmp_dev_wwn[XCOPY_NAA_IEEE_REGEX_LEN], *dev_wwn;
71 int rc;
72
73 if (src == true)
74 dev_wwn = &xop->dst_tid_wwn[0];
75 else
76 dev_wwn = &xop->src_tid_wwn[0];
77
78 mutex_lock(&g_device_mutex);
79 list_for_each_entry(se_dev, &g_device_list, g_dev_node) {
80
81 if (!se_dev->dev_attrib.emulate_3pc)
82 continue;
83
84 memset(&tmp_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN);
85 target_xcopy_gen_naa_ieee(se_dev, &tmp_dev_wwn[0]);
86
87 rc = memcmp(&tmp_dev_wwn[0], dev_wwn, XCOPY_NAA_IEEE_REGEX_LEN);
88 if (rc != 0)
89 continue;
90
91 if (src == true) {
92 xop->dst_dev = se_dev;
93 pr_debug("XCOPY 0xe4: Setting xop->dst_dev: %p from located"
94 " se_dev\n", xop->dst_dev);
95 } else {
96 xop->src_dev = se_dev;
97 pr_debug("XCOPY 0xe4: Setting xop->src_dev: %p from located"
98 " se_dev\n", xop->src_dev);
99 }
100
101 rc = configfs_depend_item(subsys,
102 &se_dev->dev_group.cg_item);
103 if (rc != 0) {
104 pr_err("configfs_depend_item attempt failed:"
105 " %d for se_dev: %p\n", rc, se_dev);
106 mutex_unlock(&g_device_mutex);
107 return rc;
108 }
109
110 pr_debug("Called configfs_depend_item for subsys: %p se_dev: %p"
111 " se_dev->se_dev_group: %p\n", subsys, se_dev,
112 &se_dev->dev_group);
113
114 mutex_unlock(&g_device_mutex);
115 return 0;
116 }
117 mutex_unlock(&g_device_mutex);
118
119 pr_err("Unable to locate 0xe4 descriptor for EXTENDED_COPY\n");
120 return -EINVAL;
121}
122
123static int target_xcopy_parse_tiddesc_e4(struct se_cmd *se_cmd, struct xcopy_op *xop,
124 unsigned char *p, bool src)
125{
126 unsigned char *desc = p;
127 unsigned short ript;
128 u8 desig_len;
129 /*
130 * Extract RELATIVE INITIATOR PORT IDENTIFIER
131 */
132 ript = get_unaligned_be16(&desc[2]);
133 pr_debug("XCOPY 0xe4: RELATIVE INITIATOR PORT IDENTIFIER: %hu\n", ript);
134 /*
135 * Check for supported code set, association, and designator type
136 */
137 if ((desc[4] & 0x0f) != 0x1) {
138 pr_err("XCOPY 0xe4: code set of non binary type not supported\n");
139 return -EINVAL;
140 }
141 if ((desc[5] & 0x30) != 0x00) {
142 pr_err("XCOPY 0xe4: association other than LUN not supported\n");
143 return -EINVAL;
144 }
145 if ((desc[5] & 0x0f) != 0x3) {
146 pr_err("XCOPY 0xe4: designator type unsupported: 0x%02x\n",
147 (desc[5] & 0x0f));
148 return -EINVAL;
149 }
150 /*
151 * Check for matching 16 byte length for NAA IEEE Registered Extended
152 * Assigned designator
153 */
154 desig_len = desc[7];
155 if (desig_len != 16) {
156 pr_err("XCOPY 0xe4: invalid desig_len: %d\n", (int)desig_len);
157 return -EINVAL;
158 }
159 pr_debug("XCOPY 0xe4: desig_len: %d\n", (int)desig_len);
160 /*
161 * Check for NAA IEEE Registered Extended Assigned header..
162 */
163 if ((desc[8] & 0xf0) != 0x60) {
164 pr_err("XCOPY 0xe4: Unsupported DESIGNATOR TYPE: 0x%02x\n",
165 (desc[8] & 0xf0));
166 return -EINVAL;
167 }
168
169 if (src == true) {
170 memcpy(&xop->src_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN);
171 /*
172 * Determine if the source designator matches the local device
173 */
174 if (!memcmp(&xop->local_dev_wwn[0], &xop->src_tid_wwn[0],
175 XCOPY_NAA_IEEE_REGEX_LEN)) {
176 xop->op_origin = XCOL_SOURCE_RECV_OP;
177 xop->src_dev = se_cmd->se_dev;
178 pr_debug("XCOPY 0xe4: Set xop->src_dev %p from source"
179 " received xop\n", xop->src_dev);
180 }
181 } else {
182 memcpy(&xop->dst_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN);
183 /*
184 * Determine if the destination designator matches the local device
185 */
186 if (!memcmp(&xop->local_dev_wwn[0], &xop->dst_tid_wwn[0],
187 XCOPY_NAA_IEEE_REGEX_LEN)) {
188 xop->op_origin = XCOL_DEST_RECV_OP;
189 xop->dst_dev = se_cmd->se_dev;
190 pr_debug("XCOPY 0xe4: Set xop->dst_dev: %p from destination"
191 " received xop\n", xop->dst_dev);
192 }
193 }
194
195 return 0;
196}
197
198static int target_xcopy_parse_target_descriptors(struct se_cmd *se_cmd,
199 struct xcopy_op *xop, unsigned char *p,
200 unsigned short tdll)
201{
202 struct se_device *local_dev = se_cmd->se_dev;
203 unsigned char *desc = p;
204 int offset = tdll % XCOPY_TARGET_DESC_LEN, rc, ret = 0;
205 unsigned short start = 0;
206 bool src = true;
207
208 if (offset != 0) {
209 pr_err("XCOPY target descriptor list length is not"
210 " multiple of %d\n", XCOPY_TARGET_DESC_LEN);
211 return -EINVAL;
212 }
213 if (tdll > 64) {
214 pr_err("XCOPY target descriptor supports a maximum"
215 " two src/dest descriptors, tdll: %hu too large..\n", tdll);
216 return -EINVAL;
217 }
218 /*
219 * Generate an IEEE Registered Extended designator based upon the
220 * se_device the XCOPY was received upon..
221 */
222 memset(&xop->local_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN);
223 target_xcopy_gen_naa_ieee(local_dev, &xop->local_dev_wwn[0]);
224
225 while (start < tdll) {
226 /*
227 * Check target descriptor identification with 0xE4 type with
228 * use VPD 0x83 WWPN matching ..
229 */
230 switch (desc[0]) {
231 case 0xe4:
232 rc = target_xcopy_parse_tiddesc_e4(se_cmd, xop,
233 &desc[0], src);
234 if (rc != 0)
235 goto out;
236 /*
237 * Assume target descriptors are in source -> destination order..
238 */
239 if (src == true)
240 src = false;
241 else
242 src = true;
243 start += XCOPY_TARGET_DESC_LEN;
244 desc += XCOPY_TARGET_DESC_LEN;
245 ret++;
246 break;
247 default:
248 pr_err("XCOPY unsupported descriptor type code:"
249 " 0x%02x\n", desc[0]);
250 goto out;
251 }
252 }
253
254 if (xop->op_origin == XCOL_SOURCE_RECV_OP)
255 rc = target_xcopy_locate_se_dev_e4(se_cmd, xop, true);
256 else
257 rc = target_xcopy_locate_se_dev_e4(se_cmd, xop, false);
258
259 if (rc < 0)
260 goto out;
261
262 pr_debug("XCOPY TGT desc: Source dev: %p NAA IEEE WWN: 0x%16phN\n",
263 xop->src_dev, &xop->src_tid_wwn[0]);
264 pr_debug("XCOPY TGT desc: Dest dev: %p NAA IEEE WWN: 0x%16phN\n",
265 xop->dst_dev, &xop->dst_tid_wwn[0]);
266
267 return ret;
268
269out:
270 return -EINVAL;
271}
272
273static int target_xcopy_parse_segdesc_02(struct se_cmd *se_cmd, struct xcopy_op *xop,
274 unsigned char *p)
275{
276 unsigned char *desc = p;
277 int dc = (desc[1] & 0x02);
278 unsigned short desc_len;
279
280 desc_len = get_unaligned_be16(&desc[2]);
281 if (desc_len != 0x18) {
282 pr_err("XCOPY segment desc 0x02: Illegal desc_len:"
283 " %hu\n", desc_len);
284 return -EINVAL;
285 }
286
287 xop->stdi = get_unaligned_be16(&desc[4]);
288 xop->dtdi = get_unaligned_be16(&desc[6]);
289 pr_debug("XCOPY seg desc 0x02: desc_len: %hu stdi: %hu dtdi: %hu, DC: %d\n",
290 desc_len, xop->stdi, xop->dtdi, dc);
291
292 xop->nolb = get_unaligned_be16(&desc[10]);
293 xop->src_lba = get_unaligned_be64(&desc[12]);
294 xop->dst_lba = get_unaligned_be64(&desc[20]);
295 pr_debug("XCOPY seg desc 0x02: nolb: %hu src_lba: %llu dst_lba: %llu\n",
296 xop->nolb, (unsigned long long)xop->src_lba,
297 (unsigned long long)xop->dst_lba);
298
299 if (dc != 0) {
300 xop->dbl = (desc[29] & 0xff) << 16;
301 xop->dbl |= (desc[30] & 0xff) << 8;
302 xop->dbl |= desc[31] & 0xff;
303
304 pr_debug("XCOPY seg desc 0x02: DC=1 w/ dbl: %u\n", xop->dbl);
305 }
306 return 0;
307}
308
309static int target_xcopy_parse_segment_descriptors(struct se_cmd *se_cmd,
310 struct xcopy_op *xop, unsigned char *p,
311 unsigned int sdll)
312{
313 unsigned char *desc = p;
314 unsigned int start = 0;
315 int offset = sdll % XCOPY_SEGMENT_DESC_LEN, rc, ret = 0;
316
317 if (offset != 0) {
318 pr_err("XCOPY segment descriptor list length is not"
319 " multiple of %d\n", XCOPY_SEGMENT_DESC_LEN);
320 return -EINVAL;
321 }
322
323 while (start < sdll) {
324 /*
325 * Check segment descriptor type code for block -> block
326 */
327 switch (desc[0]) {
328 case 0x02:
329 rc = target_xcopy_parse_segdesc_02(se_cmd, xop, desc);
330 if (rc < 0)
331 goto out;
332
333 ret++;
334 start += XCOPY_SEGMENT_DESC_LEN;
335 desc += XCOPY_SEGMENT_DESC_LEN;
336 break;
337 default:
338 pr_err("XCOPY unspported segment descriptor"
339 "type: 0x%02x\n", desc[0]);
340 goto out;
341 }
342 }
343
344 return ret;
345
346out:
347 return -EINVAL;
348}
349
350/*
351 * Start xcopy_pt ops
352 */
353
354struct xcopy_pt_cmd {
355 bool remote_port;
356 struct se_cmd se_cmd;
357 struct xcopy_op *xcopy_op;
358 struct completion xpt_passthrough_sem;
359 unsigned char sense_buffer[TRANSPORT_SENSE_BUFFER];
360};
361
362static struct se_port xcopy_pt_port;
363static struct se_portal_group xcopy_pt_tpg;
364static struct se_session xcopy_pt_sess;
365static struct se_node_acl xcopy_pt_nacl;
366
367static char *xcopy_pt_get_fabric_name(void)
368{
369 return "xcopy-pt";
370}
371
372static u32 xcopy_pt_get_tag(struct se_cmd *se_cmd)
373{
374 return 0;
375}
376
377static int xcopy_pt_get_cmd_state(struct se_cmd *se_cmd)
378{
379 return 0;
380}
381
382static 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
399static 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 kfree(xpt_cmd);
405}
406
407static int xcopy_pt_check_stop_free(struct se_cmd *se_cmd)
408{
409 struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd,
410 struct xcopy_pt_cmd, se_cmd);
411
412 complete(&xpt_cmd->xpt_passthrough_sem);
413 return 0;
414}
415
416static int xcopy_pt_write_pending(struct se_cmd *se_cmd)
417{
418 return 0;
419}
420
421static int xcopy_pt_write_pending_status(struct se_cmd *se_cmd)
422{
423 return 0;
424}
425
426static int xcopy_pt_queue_data_in(struct se_cmd *se_cmd)
427{
428 return 0;
429}
430
431static int xcopy_pt_queue_status(struct se_cmd *se_cmd)
432{
433 return 0;
434}
435
436static struct target_core_fabric_ops xcopy_pt_tfo = {
437 .get_fabric_name = xcopy_pt_get_fabric_name,
438 .get_task_tag = xcopy_pt_get_tag,
439 .get_cmd_state = xcopy_pt_get_cmd_state,
440 .release_cmd = xcopy_pt_release_cmd,
441 .check_stop_free = xcopy_pt_check_stop_free,
442 .write_pending = xcopy_pt_write_pending,
443 .write_pending_status = xcopy_pt_write_pending_status,
444 .queue_data_in = xcopy_pt_queue_data_in,
445 .queue_status = xcopy_pt_queue_status,
446};
447
448/*
449 * End xcopy_pt_ops
450 */
451
452int target_xcopy_setup_pt(void)
453{
454 xcopy_wq = alloc_workqueue("xcopy_wq", WQ_MEM_RECLAIM, 0);
455 if (!xcopy_wq) {
456 pr_err("Unable to allocate xcopy_wq\n");
457 return -ENOMEM;
458 }
459
460 memset(&xcopy_pt_port, 0, sizeof(struct se_port));
461 INIT_LIST_HEAD(&xcopy_pt_port.sep_alua_list);
462 INIT_LIST_HEAD(&xcopy_pt_port.sep_list);
463 mutex_init(&xcopy_pt_port.sep_tg_pt_md_mutex);
464
465 memset(&xcopy_pt_tpg, 0, sizeof(struct se_portal_group));
466 INIT_LIST_HEAD(&xcopy_pt_tpg.se_tpg_node);
467 INIT_LIST_HEAD(&xcopy_pt_tpg.acl_node_list);
468 INIT_LIST_HEAD(&xcopy_pt_tpg.tpg_sess_list);
469
470 xcopy_pt_port.sep_tpg = &xcopy_pt_tpg;
471 xcopy_pt_tpg.se_tpg_tfo = &xcopy_pt_tfo;
472
473 memset(&xcopy_pt_nacl, 0, sizeof(struct se_node_acl));
474 INIT_LIST_HEAD(&xcopy_pt_nacl.acl_list);
475 INIT_LIST_HEAD(&xcopy_pt_nacl.acl_sess_list);
476 memset(&xcopy_pt_sess, 0, sizeof(struct se_session));
477 INIT_LIST_HEAD(&xcopy_pt_sess.sess_list);
478 INIT_LIST_HEAD(&xcopy_pt_sess.sess_acl_list);
479
480 xcopy_pt_nacl.se_tpg = &xcopy_pt_tpg;
481 xcopy_pt_nacl.nacl_sess = &xcopy_pt_sess;
482
483 xcopy_pt_sess.se_tpg = &xcopy_pt_tpg;
484 xcopy_pt_sess.se_node_acl = &xcopy_pt_nacl;
485
486 return 0;
487}
488
489void target_xcopy_release_pt(void)
490{
491 if (xcopy_wq)
492 destroy_workqueue(xcopy_wq);
493}
494
495static void target_xcopy_setup_pt_port(
496 struct xcopy_pt_cmd *xpt_cmd,
497 struct xcopy_op *xop,
498 bool remote_port)
499{
500 struct se_cmd *ec_cmd = xop->xop_se_cmd;
501 struct se_cmd *pt_cmd = &xpt_cmd->se_cmd;
502
503 if (xop->op_origin == XCOL_SOURCE_RECV_OP) {
504 /*
505 * Honor destination port reservations for X-COPY PUSH emulation
506 * when CDB is received on local source port, and READs blocks to
507 * WRITE on remote destination port.
508 */
509 if (remote_port) {
510 xpt_cmd->remote_port = remote_port;
511 pt_cmd->se_lun->lun_sep = &xcopy_pt_port;
512 pr_debug("Setup emulated remote DEST xcopy_pt_port: %p to"
513 " cmd->se_lun->lun_sep for X-COPY data PUSH\n",
514 pt_cmd->se_lun->lun_sep);
515 } else {
516 pt_cmd->se_lun = ec_cmd->se_lun;
517 pt_cmd->se_dev = ec_cmd->se_dev;
518
519 pr_debug("Honoring local SRC port from ec_cmd->se_dev:"
520 " %p\n", pt_cmd->se_dev);
521 pt_cmd->se_lun = ec_cmd->se_lun;
522 pr_debug("Honoring local SRC port from ec_cmd->se_lun: %p\n",
523 pt_cmd->se_lun);
524 }
525 } else {
526 /*
527 * Honor source port reservation for X-COPY PULL emulation
528 * when CDB is received on local desintation port, and READs
529 * blocks from the remote source port to WRITE on local
530 * destination port.
531 */
532 if (remote_port) {
533 xpt_cmd->remote_port = remote_port;
534 pt_cmd->se_lun->lun_sep = &xcopy_pt_port;
535 pr_debug("Setup emulated remote SRC xcopy_pt_port: %p to"
536 " cmd->se_lun->lun_sep for X-COPY data PULL\n",
537 pt_cmd->se_lun->lun_sep);
538 } else {
539 pt_cmd->se_lun = ec_cmd->se_lun;
540 pt_cmd->se_dev = ec_cmd->se_dev;
541
542 pr_debug("Honoring local DST port from ec_cmd->se_dev:"
543 " %p\n", pt_cmd->se_dev);
544 pt_cmd->se_lun = ec_cmd->se_lun;
545 pr_debug("Honoring local DST port from ec_cmd->se_lun: %p\n",
546 pt_cmd->se_lun);
547 }
548 }
549}
550
551static int target_xcopy_init_pt_lun(
552 struct xcopy_pt_cmd *xpt_cmd,
553 struct xcopy_op *xop,
554 struct se_device *se_dev,
555 struct se_cmd *pt_cmd,
556 bool remote_port)
557{
558 /*
559 * Don't allocate + init an pt_cmd->se_lun if honoring local port for
560 * reservations. The pt_cmd->se_lun pointer will be setup from within
561 * target_xcopy_setup_pt_port()
562 */
563 if (remote_port == false) {
564 pt_cmd->se_cmd_flags |= SCF_SE_LUN_CMD | SCF_CMD_XCOPY_PASSTHROUGH;
565 return 0;
566 }
567
568 pt_cmd->se_lun = &se_dev->xcopy_lun;
569 pt_cmd->se_dev = se_dev;
570
571 pr_debug("Setup emulated se_dev: %p from se_dev\n", pt_cmd->se_dev);
572 pt_cmd->se_cmd_flags |= SCF_SE_LUN_CMD | SCF_CMD_XCOPY_PASSTHROUGH;
573
574 pr_debug("Setup emulated se_dev: %p to pt_cmd->se_lun->lun_se_dev\n",
575 pt_cmd->se_lun->lun_se_dev);
576
577 return 0;
578}
579
580static int target_xcopy_setup_pt_cmd(
581 struct xcopy_pt_cmd *xpt_cmd,
582 struct xcopy_op *xop,
583 struct se_device *se_dev,
584 unsigned char *cdb,
585 bool remote_port,
586 bool alloc_mem)
587{
588 struct se_cmd *cmd = &xpt_cmd->se_cmd;
589 sense_reason_t sense_rc;
590 int ret = 0, rc;
591 /*
592 * Setup LUN+port to honor reservations based upon xop->op_origin for
593 * X-COPY PUSH or X-COPY PULL based upon where the CDB was received.
594 */
595 rc = target_xcopy_init_pt_lun(xpt_cmd, xop, se_dev, cmd, remote_port);
596 if (rc < 0) {
597 ret = rc;
598 goto out;
599 }
600 xpt_cmd->xcopy_op = xop;
601 target_xcopy_setup_pt_port(xpt_cmd, xop, remote_port);
602
603 sense_rc = target_setup_cmd_from_cdb(cmd, cdb);
604 if (sense_rc) {
605 ret = -EINVAL;
606 goto out;
607 }
608
609 if (alloc_mem) {
610 rc = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
611 cmd->data_length, false);
612 if (rc < 0) {
613 ret = rc;
614 goto out;
615 }
616 /*
617 * Set this bit so that transport_free_pages() allows the
618 * caller to release SGLs + physical memory allocated by
619 * transport_generic_get_mem()..
620 */
621 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
622 } else {
623 /*
624 * Here the previously allocated SGLs for the internal READ
625 * are mapped zero-copy to the internal WRITE.
626 */
627 sense_rc = transport_generic_map_mem_to_cmd(cmd,
628 xop->xop_data_sg, xop->xop_data_nents,
629 NULL, 0);
630 if (sense_rc) {
631 ret = -EINVAL;
632 goto out;
633 }
634
635 pr_debug("Setup PASSTHROUGH_NOALLOC t_data_sg: %p t_data_nents:"
636 " %u\n", cmd->t_data_sg, cmd->t_data_nents);
637 }
638
639 return 0;
640
641out:
642 return ret;
643}
644
645static int target_xcopy_issue_pt_cmd(struct xcopy_pt_cmd *xpt_cmd)
646{
647 struct se_cmd *se_cmd = &xpt_cmd->se_cmd;
648 sense_reason_t sense_rc;
649
650 sense_rc = transport_generic_new_cmd(se_cmd);
651 if (sense_rc)
652 return -EINVAL;
653
654 if (se_cmd->data_direction == DMA_TO_DEVICE)
655 target_execute_cmd(se_cmd);
656
657 wait_for_completion_interruptible(&xpt_cmd->xpt_passthrough_sem);
658
659 pr_debug("target_xcopy_issue_pt_cmd(): SCSI status: 0x%02x\n",
660 se_cmd->scsi_status);
661
662 return (se_cmd->scsi_status) ? -EINVAL : 0;
663}
664
665static int target_xcopy_read_source(
666 struct se_cmd *ec_cmd,
667 struct xcopy_op *xop,
668 struct se_device *src_dev,
669 sector_t src_lba,
670 u32 src_sectors)
671{
672 struct xcopy_pt_cmd *xpt_cmd;
673 struct se_cmd *se_cmd;
674 u32 length = (src_sectors * src_dev->dev_attrib.block_size);
675 int rc;
676 unsigned char cdb[16];
677 bool remote_port = (xop->op_origin == XCOL_DEST_RECV_OP);
678
679 xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL);
680 if (!xpt_cmd) {
681 pr_err("Unable to allocate xcopy_pt_cmd\n");
682 return -ENOMEM;
683 }
684 init_completion(&xpt_cmd->xpt_passthrough_sem);
685 se_cmd = &xpt_cmd->se_cmd;
686
687 memset(&cdb[0], 0, 16);
688 cdb[0] = READ_16;
689 put_unaligned_be64(src_lba, &cdb[2]);
690 put_unaligned_be32(src_sectors, &cdb[10]);
691 pr_debug("XCOPY: Built READ_16: LBA: %llu Sectors: %u Length: %u\n",
692 (unsigned long long)src_lba, src_sectors, length);
693
694 transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, NULL, length,
695 DMA_FROM_DEVICE, 0, &xpt_cmd->sense_buffer[0]);
696 xop->src_pt_cmd = xpt_cmd;
697
698 rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, src_dev, &cdb[0],
699 remote_port, true);
700 if (rc < 0) {
701 transport_generic_free_cmd(se_cmd, 0);
702 return rc;
703 }
704
705 xop->xop_data_sg = se_cmd->t_data_sg;
706 xop->xop_data_nents = se_cmd->t_data_nents;
707 pr_debug("XCOPY-READ: Saved xop->xop_data_sg: %p, num: %u for READ"
708 " memory\n", xop->xop_data_sg, xop->xop_data_nents);
709
710 rc = target_xcopy_issue_pt_cmd(xpt_cmd);
711 if (rc < 0) {
712 transport_generic_free_cmd(se_cmd, 0);
713 return rc;
714 }
715 /*
716 * Clear off the allocated t_data_sg, that has been saved for
717 * zero-copy WRITE submission reuse in struct xcopy_op..
718 */
719 se_cmd->t_data_sg = NULL;
720 se_cmd->t_data_nents = 0;
721
722 return 0;
723}
724
725static int target_xcopy_write_destination(
726 struct se_cmd *ec_cmd,
727 struct xcopy_op *xop,
728 struct se_device *dst_dev,
729 sector_t dst_lba,
730 u32 dst_sectors)
731{
732 struct xcopy_pt_cmd *xpt_cmd;
733 struct se_cmd *se_cmd;
734 u32 length = (dst_sectors * dst_dev->dev_attrib.block_size);
735 int rc;
736 unsigned char cdb[16];
737 bool remote_port = (xop->op_origin == XCOL_SOURCE_RECV_OP);
738
739 xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL);
740 if (!xpt_cmd) {
741 pr_err("Unable to allocate xcopy_pt_cmd\n");
742 return -ENOMEM;
743 }
744 init_completion(&xpt_cmd->xpt_passthrough_sem);
745 se_cmd = &xpt_cmd->se_cmd;
746
747 memset(&cdb[0], 0, 16);
748 cdb[0] = WRITE_16;
749 put_unaligned_be64(dst_lba, &cdb[2]);
750 put_unaligned_be32(dst_sectors, &cdb[10]);
751 pr_debug("XCOPY: Built WRITE_16: LBA: %llu Sectors: %u Length: %u\n",
752 (unsigned long long)dst_lba, dst_sectors, length);
753
754 transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, NULL, length,
755 DMA_TO_DEVICE, 0, &xpt_cmd->sense_buffer[0]);
756 xop->dst_pt_cmd = xpt_cmd;
757
758 rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, dst_dev, &cdb[0],
759 remote_port, false);
760 if (rc < 0) {
761 struct se_cmd *src_cmd = &xop->src_pt_cmd->se_cmd;
762 /*
763 * If the failure happened before the t_mem_list hand-off in
764 * target_xcopy_setup_pt_cmd(), Reset memory + clear flag so that
765 * core releases this memory on error during X-COPY WRITE I/O.
766 */
767 src_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
768 src_cmd->t_data_sg = xop->xop_data_sg;
769 src_cmd->t_data_nents = xop->xop_data_nents;
770
771 transport_generic_free_cmd(se_cmd, 0);
772 return rc;
773 }
774
775 rc = target_xcopy_issue_pt_cmd(xpt_cmd);
776 if (rc < 0) {
777 se_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
778 transport_generic_free_cmd(se_cmd, 0);
779 return rc;
780 }
781
782 return 0;
783}
784
785static void target_xcopy_do_work(struct work_struct *work)
786{
787 struct xcopy_op *xop = container_of(work, struct xcopy_op, xop_work);
788 struct se_device *src_dev = xop->src_dev, *dst_dev = xop->dst_dev;
789 struct se_cmd *ec_cmd = xop->xop_se_cmd;
790 sector_t src_lba = xop->src_lba, dst_lba = xop->dst_lba, end_lba;
791 unsigned int max_sectors;
792 int rc;
793 unsigned short nolb = xop->nolb, cur_nolb, max_nolb, copied_nolb = 0;
794
795 end_lba = src_lba + nolb;
796 /*
797 * Break up XCOPY I/O into hw_max_sectors sized I/O based on the
798 * smallest max_sectors between src_dev + dev_dev, or
799 */
800 max_sectors = min(src_dev->dev_attrib.hw_max_sectors,
801 dst_dev->dev_attrib.hw_max_sectors);
802 max_sectors = min_t(u32, max_sectors, XCOPY_MAX_SECTORS);
803
804 max_nolb = min_t(u16, max_sectors, ((u16)(~0U)));
805
806 pr_debug("target_xcopy_do_work: nolb: %hu, max_nolb: %hu end_lba: %llu\n",
807 nolb, max_nolb, (unsigned long long)end_lba);
808 pr_debug("target_xcopy_do_work: Starting src_lba: %llu, dst_lba: %llu\n",
809 (unsigned long long)src_lba, (unsigned long long)dst_lba);
810
811 while (src_lba < end_lba) {
812 cur_nolb = min(nolb, max_nolb);
813
814 pr_debug("target_xcopy_do_work: Calling read src_dev: %p src_lba: %llu,"
815 " cur_nolb: %hu\n", src_dev, (unsigned long long)src_lba, cur_nolb);
816
817 rc = target_xcopy_read_source(ec_cmd, xop, src_dev, src_lba, cur_nolb);
818 if (rc < 0)
819 goto out;
820
821 src_lba += cur_nolb;
822 pr_debug("target_xcopy_do_work: Incremented READ src_lba to %llu\n",
823 (unsigned long long)src_lba);
824
825 pr_debug("target_xcopy_do_work: Calling write dst_dev: %p dst_lba: %llu,"
826 " cur_nolb: %hu\n", dst_dev, (unsigned long long)dst_lba, cur_nolb);
827
828 rc = target_xcopy_write_destination(ec_cmd, xop, dst_dev,
829 dst_lba, cur_nolb);
830 if (rc < 0) {
831 transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0);
832 goto out;
833 }
834
835 dst_lba += cur_nolb;
836 pr_debug("target_xcopy_do_work: Incremented WRITE dst_lba to %llu\n",
837 (unsigned long long)dst_lba);
838
839 copied_nolb += cur_nolb;
840 nolb -= cur_nolb;
841
842 transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0);
843 xop->dst_pt_cmd->se_cmd.se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
844
845 transport_generic_free_cmd(&xop->dst_pt_cmd->se_cmd, 0);
846 }
847
848 xcopy_pt_undepend_remotedev(xop);
849 kfree(xop);
850
851 pr_debug("target_xcopy_do_work: Final src_lba: %llu, dst_lba: %llu\n",
852 (unsigned long long)src_lba, (unsigned long long)dst_lba);
853 pr_debug("target_xcopy_do_work: Blocks copied: %hu, Bytes Copied: %u\n",
854 copied_nolb, copied_nolb * dst_dev->dev_attrib.block_size);
855
856 pr_debug("target_xcopy_do_work: Setting X-COPY GOOD status -> sending response\n");
857 target_complete_cmd(ec_cmd, SAM_STAT_GOOD);
858 return;
859
860out:
861 xcopy_pt_undepend_remotedev(xop);
862 kfree(xop);
863
864 pr_warn("target_xcopy_do_work: Setting X-COPY CHECK_CONDITION -> sending response\n");
865 ec_cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
866 target_complete_cmd(ec_cmd, SAM_STAT_CHECK_CONDITION);
867}
868
869sense_reason_t target_do_xcopy(struct se_cmd *se_cmd)
870{
871 struct se_device *dev = se_cmd->se_dev;
872 struct xcopy_op *xop = NULL;
873 unsigned char *p = NULL, *seg_desc;
874 unsigned int list_id, list_id_usage, sdll, inline_dl, sa;
875 sense_reason_t ret = TCM_INVALID_PARAMETER_LIST;
876 int rc;
877 unsigned short tdll;
878
879 if (!dev->dev_attrib.emulate_3pc) {
880 pr_err("EXTENDED_COPY operation explicitly disabled\n");
881 return TCM_UNSUPPORTED_SCSI_OPCODE;
882 }
883
884 sa = se_cmd->t_task_cdb[1] & 0x1f;
885 if (sa != 0x00) {
886 pr_err("EXTENDED_COPY(LID4) not supported\n");
887 return TCM_UNSUPPORTED_SCSI_OPCODE;
888 }
889
890 xop = kzalloc(sizeof(struct xcopy_op), GFP_KERNEL);
891 if (!xop) {
892 pr_err("Unable to allocate xcopy_op\n");
893 return TCM_OUT_OF_RESOURCES;
894 }
895 xop->xop_se_cmd = se_cmd;
896
897 p = transport_kmap_data_sg(se_cmd);
898 if (!p) {
899 pr_err("transport_kmap_data_sg() failed in target_do_xcopy\n");
900 kfree(xop);
901 return TCM_OUT_OF_RESOURCES;
902 }
903
904 list_id = p[0];
905 list_id_usage = (p[1] & 0x18) >> 3;
906
907 /*
908 * Determine TARGET DESCRIPTOR LIST LENGTH + SEGMENT DESCRIPTOR LIST LENGTH
909 */
910 tdll = get_unaligned_be16(&p[2]);
911 sdll = get_unaligned_be32(&p[8]);
912
913 inline_dl = get_unaligned_be32(&p[12]);
914 if (inline_dl != 0) {
915 pr_err("XCOPY with non zero inline data length\n");
916 goto out;
917 }
918
919 pr_debug("Processing XCOPY with list_id: 0x%02x list_id_usage: 0x%02x"
920 " tdll: %hu sdll: %u inline_dl: %u\n", list_id, list_id_usage,
921 tdll, sdll, inline_dl);
922
923 rc = target_xcopy_parse_target_descriptors(se_cmd, xop, &p[16], tdll);
924 if (rc <= 0)
925 goto out;
926
927 if (xop->src_dev->dev_attrib.block_size !=
928 xop->dst_dev->dev_attrib.block_size) {
929 pr_err("XCOPY: Non matching src_dev block_size: %u + dst_dev"
930 " block_size: %u currently unsupported\n",
931 xop->src_dev->dev_attrib.block_size,
932 xop->dst_dev->dev_attrib.block_size);
933 xcopy_pt_undepend_remotedev(xop);
934 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
935 goto out;
936 }
937
938 pr_debug("XCOPY: Processed %d target descriptors, length: %u\n", rc,
939 rc * XCOPY_TARGET_DESC_LEN);
940 seg_desc = &p[16];
941 seg_desc += (rc * XCOPY_TARGET_DESC_LEN);
942
943 rc = target_xcopy_parse_segment_descriptors(se_cmd, xop, seg_desc, sdll);
944 if (rc <= 0) {
945 xcopy_pt_undepend_remotedev(xop);
946 goto out;
947 }
948 transport_kunmap_data_sg(se_cmd);
949
950 pr_debug("XCOPY: Processed %d segment descriptors, length: %u\n", rc,
951 rc * XCOPY_SEGMENT_DESC_LEN);
952 INIT_WORK(&xop->xop_work, target_xcopy_do_work);
953 queue_work(xcopy_wq, &xop->xop_work);
954 return TCM_NO_SENSE;
955
956out:
957 if (p)
958 transport_kunmap_data_sg(se_cmd);
959 kfree(xop);
960 return ret;
961}
962
963static sense_reason_t target_rcr_operating_parameters(struct se_cmd *se_cmd)
964{
965 unsigned char *p;
966
967 p = transport_kmap_data_sg(se_cmd);
968 if (!p) {
969 pr_err("transport_kmap_data_sg failed in"
970 " target_rcr_operating_parameters\n");
971 return TCM_OUT_OF_RESOURCES;
972 }
973
974 if (se_cmd->data_length < 54) {
975 pr_err("Receive Copy Results Op Parameters length"
976 " too small: %u\n", se_cmd->data_length);
977 transport_kunmap_data_sg(se_cmd);
978 return TCM_INVALID_CDB_FIELD;
979 }
980 /*
981 * Set SNLID=1 (Supports no List ID)
982 */
983 p[4] = 0x1;
984 /*
985 * MAXIMUM TARGET DESCRIPTOR COUNT
986 */
987 put_unaligned_be16(RCR_OP_MAX_TARGET_DESC_COUNT, &p[8]);
988 /*
989 * MAXIMUM SEGMENT DESCRIPTOR COUNT
990 */
991 put_unaligned_be16(RCR_OP_MAX_SG_DESC_COUNT, &p[10]);
992 /*
993 * MAXIMUM DESCRIPTOR LIST LENGTH
994 */
995 put_unaligned_be32(RCR_OP_MAX_DESC_LIST_LEN, &p[12]);
996 /*
997 * MAXIMUM SEGMENT LENGTH
998 */
999 put_unaligned_be32(RCR_OP_MAX_SEGMENT_LEN, &p[16]);
1000 /*
1001 * MAXIMUM INLINE DATA LENGTH for SA 0x04 (NOT SUPPORTED)
1002 */
1003 put_unaligned_be32(0x0, &p[20]);
1004 /*
1005 * HELD DATA LIMIT
1006 */
1007 put_unaligned_be32(0x0, &p[24]);
1008 /*
1009 * MAXIMUM STREAM DEVICE TRANSFER SIZE
1010 */
1011 put_unaligned_be32(0x0, &p[28]);
1012 /*
1013 * TOTAL CONCURRENT COPIES
1014 */
1015 put_unaligned_be16(RCR_OP_TOTAL_CONCURR_COPIES, &p[34]);
1016 /*
1017 * MAXIMUM CONCURRENT COPIES
1018 */
1019 p[36] = RCR_OP_MAX_CONCURR_COPIES;
1020 /*
1021 * DATA SEGMENT GRANULARITY (log 2)
1022 */
1023 p[37] = RCR_OP_DATA_SEG_GRAN_LOG2;
1024 /*
1025 * INLINE DATA GRANULARITY log 2)
1026 */
1027 p[38] = RCR_OP_INLINE_DATA_GRAN_LOG2;
1028 /*
1029 * HELD DATA GRANULARITY
1030 */
1031 p[39] = RCR_OP_HELD_DATA_GRAN_LOG2;
1032 /*
1033 * IMPLEMENTED DESCRIPTOR LIST LENGTH
1034 */
1035 p[43] = 0x2;
1036 /*
1037 * List of implemented descriptor type codes (ordered)
1038 */
1039 p[44] = 0x02; /* Copy Block to Block device */
1040 p[45] = 0xe4; /* Identification descriptor target descriptor */
1041
1042 /*
1043 * AVAILABLE DATA (n-3)
1044 */
1045 put_unaligned_be32(42, &p[0]);
1046
1047 transport_kunmap_data_sg(se_cmd);
1048 target_complete_cmd(se_cmd, GOOD);
1049
1050 return TCM_NO_SENSE;
1051}
1052
1053sense_reason_t target_do_receive_copy_results(struct se_cmd *se_cmd)
1054{
1055 unsigned char *cdb = &se_cmd->t_task_cdb[0];
1056 int sa = (cdb[1] & 0x1f), list_id = cdb[2];
1057 sense_reason_t rc = TCM_NO_SENSE;
1058
1059 pr_debug("Entering target_do_receive_copy_results: SA: 0x%02x, List ID:"
1060 " 0x%02x, AL: %u\n", sa, list_id, se_cmd->data_length);
1061
1062 if (list_id != 0) {
1063 pr_err("Receive Copy Results with non zero list identifier"
1064 " not supported\n");
1065 return TCM_INVALID_CDB_FIELD;
1066 }
1067
1068 switch (sa) {
1069 case RCR_SA_OPERATING_PARAMETERS:
1070 rc = target_rcr_operating_parameters(se_cmd);
1071 break;
1072 case RCR_SA_COPY_STATUS:
1073 case RCR_SA_RECEIVE_DATA:
1074 case RCR_SA_FAILED_SEGMENT_DETAILS:
1075 default:
1076 pr_err("Unsupported SA for receive copy results: 0x%02x\n", sa);
1077 return TCM_INVALID_CDB_FIELD;
1078 }
1079
1080 return rc;
1081}