1 /*******************************************************************************
2 * Filename: target_core_xcopy.c
4 * This file contains support for SPC-4 Extended-Copy offload with generic
7 * Copyright (c) 2011-2013 Datera, Inc. All rights reserved.
10 * Nicholas A. Bellinger <nab@daterainc.com>
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.
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.
22 ******************************************************************************/
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>
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>
37 #include "target_core_internal.h"
38 #include "target_core_pr.h"
39 #include "target_core_ua.h"
40 #include "target_core_xcopy.h"
42 static struct workqueue_struct *xcopy_wq = NULL;
44 static int target_xcopy_gen_naa_ieee(struct se_device *dev, unsigned char *buf)
48 buf[off++] = (0x6 << 4);
51 buf[off] = (0x5 << 4);
53 spc_parse_naa_6h_vendor_specific(dev, &buf[off]);
57 static int target_xcopy_locate_se_dev_e4(struct se_cmd *se_cmd, struct xcopy_op *xop,
60 struct se_device *se_dev;
61 struct configfs_subsystem *subsys = target_core_subsystem[0];
62 unsigned char tmp_dev_wwn[XCOPY_NAA_IEEE_REGEX_LEN], *dev_wwn;
66 dev_wwn = &xop->dst_tid_wwn[0];
68 dev_wwn = &xop->src_tid_wwn[0];
70 mutex_lock(&g_device_mutex);
71 list_for_each_entry(se_dev, &g_device_list, g_dev_node) {
73 if (!se_dev->dev_attrib.emulate_3pc)
76 memset(&tmp_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN);
77 target_xcopy_gen_naa_ieee(se_dev, &tmp_dev_wwn[0]);
79 rc = memcmp(&tmp_dev_wwn[0], dev_wwn, XCOPY_NAA_IEEE_REGEX_LEN);
84 xop->dst_dev = se_dev;
85 pr_debug("XCOPY 0xe4: Setting xop->dst_dev: %p from located"
86 " se_dev\n", xop->dst_dev);
88 xop->src_dev = se_dev;
89 pr_debug("XCOPY 0xe4: Setting xop->src_dev: %p from located"
90 " se_dev\n", xop->src_dev);
93 rc = configfs_depend_item(subsys,
94 &se_dev->dev_group.cg_item);
96 pr_err("configfs_depend_item attempt failed:"
97 " %d for se_dev: %p\n", rc, se_dev);
98 mutex_unlock(&g_device_mutex);
102 pr_debug("Called configfs_depend_item for subsys: %p se_dev: %p"
103 " se_dev->se_dev_group: %p\n", subsys, se_dev,
106 mutex_unlock(&g_device_mutex);
109 mutex_unlock(&g_device_mutex);
111 pr_err("Unable to locate 0xe4 descriptor for EXTENDED_COPY\n");
115 static int target_xcopy_parse_tiddesc_e4(struct se_cmd *se_cmd, struct xcopy_op *xop,
116 unsigned char *p, bool src)
118 unsigned char *desc = p;
122 * Extract RELATIVE INITIATOR PORT IDENTIFIER
124 ript = get_unaligned_be16(&desc[2]);
125 pr_debug("XCOPY 0xe4: RELATIVE INITIATOR PORT IDENTIFIER: %hu\n", ript);
127 * Check for supported code set, association, and designator type
129 if ((desc[4] & 0x0f) != 0x1) {
130 pr_err("XCOPY 0xe4: code set of non binary type not supported\n");
133 if ((desc[5] & 0x30) != 0x00) {
134 pr_err("XCOPY 0xe4: association other than LUN not supported\n");
137 if ((desc[5] & 0x0f) != 0x3) {
138 pr_err("XCOPY 0xe4: designator type unsupported: 0x%02x\n",
143 * Check for matching 16 byte length for NAA IEEE Registered Extended
144 * Assigned designator
147 if (desig_len != 16) {
148 pr_err("XCOPY 0xe4: invalid desig_len: %d\n", (int)desig_len);
151 pr_debug("XCOPY 0xe4: desig_len: %d\n", (int)desig_len);
153 * Check for NAA IEEE Registered Extended Assigned header..
155 if ((desc[8] & 0xf0) != 0x60) {
156 pr_err("XCOPY 0xe4: Unsupported DESIGNATOR TYPE: 0x%02x\n",
162 memcpy(&xop->src_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN);
164 * Determine if the source designator matches the local device
166 if (!memcmp(&xop->local_dev_wwn[0], &xop->src_tid_wwn[0],
167 XCOPY_NAA_IEEE_REGEX_LEN)) {
168 xop->op_origin = XCOL_SOURCE_RECV_OP;
169 xop->src_dev = se_cmd->se_dev;
170 pr_debug("XCOPY 0xe4: Set xop->src_dev %p from source"
171 " received xop\n", xop->src_dev);
174 memcpy(&xop->dst_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN);
176 * Determine if the destination designator matches the local device
178 if (!memcmp(&xop->local_dev_wwn[0], &xop->dst_tid_wwn[0],
179 XCOPY_NAA_IEEE_REGEX_LEN)) {
180 xop->op_origin = XCOL_DEST_RECV_OP;
181 xop->dst_dev = se_cmd->se_dev;
182 pr_debug("XCOPY 0xe4: Set xop->dst_dev: %p from destination"
183 " received xop\n", xop->dst_dev);
190 static int target_xcopy_parse_target_descriptors(struct se_cmd *se_cmd,
191 struct xcopy_op *xop, unsigned char *p,
194 struct se_device *local_dev = se_cmd->se_dev;
195 unsigned char *desc = p;
196 int offset = tdll % XCOPY_TARGET_DESC_LEN, rc, ret = 0;
197 unsigned short start = 0;
201 pr_err("XCOPY target descriptor list length is not"
202 " multiple of %d\n", XCOPY_TARGET_DESC_LEN);
206 pr_err("XCOPY target descriptor supports a maximum"
207 " two src/dest descriptors, tdll: %hu too large..\n", tdll);
211 * Generate an IEEE Registered Extended designator based upon the
212 * se_device the XCOPY was received upon..
214 memset(&xop->local_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN);
215 target_xcopy_gen_naa_ieee(local_dev, &xop->local_dev_wwn[0]);
217 while (start < tdll) {
219 * Check target descriptor identification with 0xE4 type with
220 * use VPD 0x83 WWPN matching ..
224 rc = target_xcopy_parse_tiddesc_e4(se_cmd, xop,
229 * Assume target descriptors are in source -> destination order..
235 start += XCOPY_TARGET_DESC_LEN;
236 desc += XCOPY_TARGET_DESC_LEN;
240 pr_err("XCOPY unsupported descriptor type code:"
241 " 0x%02x\n", desc[0]);
246 if (xop->op_origin == XCOL_SOURCE_RECV_OP)
247 rc = target_xcopy_locate_se_dev_e4(se_cmd, xop, true);
249 rc = target_xcopy_locate_se_dev_e4(se_cmd, xop, false);
254 pr_debug("XCOPY TGT desc: Source dev: %p NAA IEEE WWN: 0x%16phN\n",
255 xop->src_dev, &xop->src_tid_wwn[0]);
256 pr_debug("XCOPY TGT desc: Dest dev: %p NAA IEEE WWN: 0x%16phN\n",
257 xop->dst_dev, &xop->dst_tid_wwn[0]);
265 static int target_xcopy_parse_segdesc_02(struct se_cmd *se_cmd, struct xcopy_op *xop,
268 unsigned char *desc = p;
269 int dc = (desc[1] & 0x02);
270 unsigned short desc_len;
272 desc_len = get_unaligned_be16(&desc[2]);
273 if (desc_len != 0x18) {
274 pr_err("XCOPY segment desc 0x02: Illegal desc_len:"
279 xop->stdi = get_unaligned_be16(&desc[4]);
280 xop->dtdi = get_unaligned_be16(&desc[6]);
281 pr_debug("XCOPY seg desc 0x02: desc_len: %hu stdi: %hu dtdi: %hu, DC: %d\n",
282 desc_len, xop->stdi, xop->dtdi, dc);
284 xop->nolb = get_unaligned_be16(&desc[10]);
285 xop->src_lba = get_unaligned_be64(&desc[12]);
286 xop->dst_lba = get_unaligned_be64(&desc[20]);
287 pr_debug("XCOPY seg desc 0x02: nolb: %hu src_lba: %llu dst_lba: %llu\n",
288 xop->nolb, (unsigned long long)xop->src_lba,
289 (unsigned long long)xop->dst_lba);
292 xop->dbl = (desc[29] & 0xff) << 16;
293 xop->dbl |= (desc[30] & 0xff) << 8;
294 xop->dbl |= desc[31] & 0xff;
296 pr_debug("XCOPY seg desc 0x02: DC=1 w/ dbl: %u\n", xop->dbl);
301 static int target_xcopy_parse_segment_descriptors(struct se_cmd *se_cmd,
302 struct xcopy_op *xop, unsigned char *p,
305 unsigned char *desc = p;
306 unsigned int start = 0;
307 int offset = sdll % XCOPY_SEGMENT_DESC_LEN, rc, ret = 0;
310 pr_err("XCOPY segment descriptor list length is not"
311 " multiple of %d\n", XCOPY_SEGMENT_DESC_LEN);
315 while (start < sdll) {
317 * Check segment descriptor type code for block -> block
321 rc = target_xcopy_parse_segdesc_02(se_cmd, xop, desc);
326 start += XCOPY_SEGMENT_DESC_LEN;
327 desc += XCOPY_SEGMENT_DESC_LEN;
330 pr_err("XCOPY unsupported segment descriptor"
331 "type: 0x%02x\n", desc[0]);
346 struct xcopy_pt_cmd {
348 struct se_cmd se_cmd;
349 struct xcopy_op *xcopy_op;
350 struct completion xpt_passthrough_sem;
351 unsigned char sense_buffer[TRANSPORT_SENSE_BUFFER];
354 static struct se_port xcopy_pt_port;
355 static struct se_portal_group xcopy_pt_tpg;
356 static struct se_session xcopy_pt_sess;
357 static struct se_node_acl xcopy_pt_nacl;
359 static char *xcopy_pt_get_fabric_name(void)
364 static u32 xcopy_pt_get_tag(struct se_cmd *se_cmd)
369 static int xcopy_pt_get_cmd_state(struct se_cmd *se_cmd)
374 static void xcopy_pt_undepend_remotedev(struct xcopy_op *xop)
376 struct configfs_subsystem *subsys = target_core_subsystem[0];
377 struct se_device *remote_dev;
379 if (xop->op_origin == XCOL_SOURCE_RECV_OP)
380 remote_dev = xop->dst_dev;
382 remote_dev = xop->src_dev;
384 pr_debug("Calling configfs_undepend_item for subsys: %p"
385 " remote_dev: %p remote_dev->dev_group: %p\n",
386 subsys, remote_dev, &remote_dev->dev_group.cg_item);
388 configfs_undepend_item(subsys, &remote_dev->dev_group.cg_item);
391 static void xcopy_pt_release_cmd(struct se_cmd *se_cmd)
393 struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd,
394 struct xcopy_pt_cmd, se_cmd);
399 static int xcopy_pt_check_stop_free(struct se_cmd *se_cmd)
401 struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd,
402 struct xcopy_pt_cmd, se_cmd);
404 complete(&xpt_cmd->xpt_passthrough_sem);
408 static int xcopy_pt_write_pending(struct se_cmd *se_cmd)
413 static int xcopy_pt_write_pending_status(struct se_cmd *se_cmd)
418 static int xcopy_pt_queue_data_in(struct se_cmd *se_cmd)
423 static int xcopy_pt_queue_status(struct se_cmd *se_cmd)
428 static struct target_core_fabric_ops xcopy_pt_tfo = {
429 .get_fabric_name = xcopy_pt_get_fabric_name,
430 .get_task_tag = xcopy_pt_get_tag,
431 .get_cmd_state = xcopy_pt_get_cmd_state,
432 .release_cmd = xcopy_pt_release_cmd,
433 .check_stop_free = xcopy_pt_check_stop_free,
434 .write_pending = xcopy_pt_write_pending,
435 .write_pending_status = xcopy_pt_write_pending_status,
436 .queue_data_in = xcopy_pt_queue_data_in,
437 .queue_status = xcopy_pt_queue_status,
444 int target_xcopy_setup_pt(void)
446 xcopy_wq = alloc_workqueue("xcopy_wq", WQ_MEM_RECLAIM, 0);
448 pr_err("Unable to allocate xcopy_wq\n");
452 memset(&xcopy_pt_port, 0, sizeof(struct se_port));
453 INIT_LIST_HEAD(&xcopy_pt_port.sep_alua_list);
454 INIT_LIST_HEAD(&xcopy_pt_port.sep_list);
455 mutex_init(&xcopy_pt_port.sep_tg_pt_md_mutex);
457 memset(&xcopy_pt_tpg, 0, sizeof(struct se_portal_group));
458 INIT_LIST_HEAD(&xcopy_pt_tpg.se_tpg_node);
459 INIT_LIST_HEAD(&xcopy_pt_tpg.acl_node_list);
460 INIT_LIST_HEAD(&xcopy_pt_tpg.tpg_sess_list);
462 xcopy_pt_port.sep_tpg = &xcopy_pt_tpg;
463 xcopy_pt_tpg.se_tpg_tfo = &xcopy_pt_tfo;
465 memset(&xcopy_pt_nacl, 0, sizeof(struct se_node_acl));
466 INIT_LIST_HEAD(&xcopy_pt_nacl.acl_list);
467 INIT_LIST_HEAD(&xcopy_pt_nacl.acl_sess_list);
468 memset(&xcopy_pt_sess, 0, sizeof(struct se_session));
469 INIT_LIST_HEAD(&xcopy_pt_sess.sess_list);
470 INIT_LIST_HEAD(&xcopy_pt_sess.sess_acl_list);
472 xcopy_pt_nacl.se_tpg = &xcopy_pt_tpg;
473 xcopy_pt_nacl.nacl_sess = &xcopy_pt_sess;
475 xcopy_pt_sess.se_tpg = &xcopy_pt_tpg;
476 xcopy_pt_sess.se_node_acl = &xcopy_pt_nacl;
481 void target_xcopy_release_pt(void)
484 destroy_workqueue(xcopy_wq);
487 static void target_xcopy_setup_pt_port(
488 struct xcopy_pt_cmd *xpt_cmd,
489 struct xcopy_op *xop,
492 struct se_cmd *ec_cmd = xop->xop_se_cmd;
493 struct se_cmd *pt_cmd = &xpt_cmd->se_cmd;
495 if (xop->op_origin == XCOL_SOURCE_RECV_OP) {
497 * Honor destination port reservations for X-COPY PUSH emulation
498 * when CDB is received on local source port, and READs blocks to
499 * WRITE on remote destination port.
502 xpt_cmd->remote_port = remote_port;
503 pt_cmd->se_lun->lun_sep = &xcopy_pt_port;
504 pr_debug("Setup emulated remote DEST xcopy_pt_port: %p to"
505 " cmd->se_lun->lun_sep for X-COPY data PUSH\n",
506 pt_cmd->se_lun->lun_sep);
508 pt_cmd->se_lun = ec_cmd->se_lun;
509 pt_cmd->se_dev = ec_cmd->se_dev;
511 pr_debug("Honoring local SRC port from ec_cmd->se_dev:"
512 " %p\n", pt_cmd->se_dev);
513 pt_cmd->se_lun = ec_cmd->se_lun;
514 pr_debug("Honoring local SRC port from ec_cmd->se_lun: %p\n",
519 * Honor source port reservation for X-COPY PULL emulation
520 * when CDB is received on local desintation port, and READs
521 * blocks from the remote source port to WRITE on local
525 xpt_cmd->remote_port = remote_port;
526 pt_cmd->se_lun->lun_sep = &xcopy_pt_port;
527 pr_debug("Setup emulated remote SRC xcopy_pt_port: %p to"
528 " cmd->se_lun->lun_sep for X-COPY data PULL\n",
529 pt_cmd->se_lun->lun_sep);
531 pt_cmd->se_lun = ec_cmd->se_lun;
532 pt_cmd->se_dev = ec_cmd->se_dev;
534 pr_debug("Honoring local DST port from ec_cmd->se_dev:"
535 " %p\n", pt_cmd->se_dev);
536 pt_cmd->se_lun = ec_cmd->se_lun;
537 pr_debug("Honoring local DST port from ec_cmd->se_lun: %p\n",
543 static int target_xcopy_init_pt_lun(
544 struct xcopy_pt_cmd *xpt_cmd,
545 struct xcopy_op *xop,
546 struct se_device *se_dev,
547 struct se_cmd *pt_cmd,
551 * Don't allocate + init an pt_cmd->se_lun if honoring local port for
552 * reservations. The pt_cmd->se_lun pointer will be setup from within
553 * target_xcopy_setup_pt_port()
556 pt_cmd->se_cmd_flags |= SCF_SE_LUN_CMD | SCF_CMD_XCOPY_PASSTHROUGH;
560 pt_cmd->se_lun = &se_dev->xcopy_lun;
561 pt_cmd->se_dev = se_dev;
563 pr_debug("Setup emulated se_dev: %p from se_dev\n", pt_cmd->se_dev);
564 pt_cmd->se_cmd_flags |= SCF_SE_LUN_CMD | SCF_CMD_XCOPY_PASSTHROUGH;
566 pr_debug("Setup emulated se_dev: %p to pt_cmd->se_lun->lun_se_dev\n",
567 pt_cmd->se_lun->lun_se_dev);
572 static int target_xcopy_setup_pt_cmd(
573 struct xcopy_pt_cmd *xpt_cmd,
574 struct xcopy_op *xop,
575 struct se_device *se_dev,
580 struct se_cmd *cmd = &xpt_cmd->se_cmd;
581 sense_reason_t sense_rc;
584 * Setup LUN+port to honor reservations based upon xop->op_origin for
585 * X-COPY PUSH or X-COPY PULL based upon where the CDB was received.
587 rc = target_xcopy_init_pt_lun(xpt_cmd, xop, se_dev, cmd, remote_port);
592 xpt_cmd->xcopy_op = xop;
593 target_xcopy_setup_pt_port(xpt_cmd, xop, remote_port);
595 sense_rc = target_setup_cmd_from_cdb(cmd, cdb);
602 rc = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
603 cmd->data_length, false);
609 * Set this bit so that transport_free_pages() allows the
610 * caller to release SGLs + physical memory allocated by
611 * transport_generic_get_mem()..
613 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
616 * Here the previously allocated SGLs for the internal READ
617 * are mapped zero-copy to the internal WRITE.
619 sense_rc = transport_generic_map_mem_to_cmd(cmd,
620 xop->xop_data_sg, xop->xop_data_nents,
627 pr_debug("Setup PASSTHROUGH_NOALLOC t_data_sg: %p t_data_nents:"
628 " %u\n", cmd->t_data_sg, cmd->t_data_nents);
637 static int target_xcopy_issue_pt_cmd(struct xcopy_pt_cmd *xpt_cmd)
639 struct se_cmd *se_cmd = &xpt_cmd->se_cmd;
640 sense_reason_t sense_rc;
642 sense_rc = transport_generic_new_cmd(se_cmd);
646 if (se_cmd->data_direction == DMA_TO_DEVICE)
647 target_execute_cmd(se_cmd);
649 wait_for_completion_interruptible(&xpt_cmd->xpt_passthrough_sem);
651 pr_debug("target_xcopy_issue_pt_cmd(): SCSI status: 0x%02x\n",
652 se_cmd->scsi_status);
654 return (se_cmd->scsi_status) ? -EINVAL : 0;
657 static int target_xcopy_read_source(
658 struct se_cmd *ec_cmd,
659 struct xcopy_op *xop,
660 struct se_device *src_dev,
664 struct xcopy_pt_cmd *xpt_cmd;
665 struct se_cmd *se_cmd;
666 u32 length = (src_sectors * src_dev->dev_attrib.block_size);
668 unsigned char cdb[16];
669 bool remote_port = (xop->op_origin == XCOL_DEST_RECV_OP);
671 xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL);
673 pr_err("Unable to allocate xcopy_pt_cmd\n");
676 init_completion(&xpt_cmd->xpt_passthrough_sem);
677 se_cmd = &xpt_cmd->se_cmd;
679 memset(&cdb[0], 0, 16);
681 put_unaligned_be64(src_lba, &cdb[2]);
682 put_unaligned_be32(src_sectors, &cdb[10]);
683 pr_debug("XCOPY: Built READ_16: LBA: %llu Sectors: %u Length: %u\n",
684 (unsigned long long)src_lba, src_sectors, length);
686 transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, NULL, length,
687 DMA_FROM_DEVICE, 0, &xpt_cmd->sense_buffer[0]);
688 xop->src_pt_cmd = xpt_cmd;
690 rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, src_dev, &cdb[0],
693 transport_generic_free_cmd(se_cmd, 0);
697 xop->xop_data_sg = se_cmd->t_data_sg;
698 xop->xop_data_nents = se_cmd->t_data_nents;
699 pr_debug("XCOPY-READ: Saved xop->xop_data_sg: %p, num: %u for READ"
700 " memory\n", xop->xop_data_sg, xop->xop_data_nents);
702 rc = target_xcopy_issue_pt_cmd(xpt_cmd);
704 transport_generic_free_cmd(se_cmd, 0);
708 * Clear off the allocated t_data_sg, that has been saved for
709 * zero-copy WRITE submission reuse in struct xcopy_op..
711 se_cmd->t_data_sg = NULL;
712 se_cmd->t_data_nents = 0;
717 static int target_xcopy_write_destination(
718 struct se_cmd *ec_cmd,
719 struct xcopy_op *xop,
720 struct se_device *dst_dev,
724 struct xcopy_pt_cmd *xpt_cmd;
725 struct se_cmd *se_cmd;
726 u32 length = (dst_sectors * dst_dev->dev_attrib.block_size);
728 unsigned char cdb[16];
729 bool remote_port = (xop->op_origin == XCOL_SOURCE_RECV_OP);
731 xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL);
733 pr_err("Unable to allocate xcopy_pt_cmd\n");
736 init_completion(&xpt_cmd->xpt_passthrough_sem);
737 se_cmd = &xpt_cmd->se_cmd;
739 memset(&cdb[0], 0, 16);
741 put_unaligned_be64(dst_lba, &cdb[2]);
742 put_unaligned_be32(dst_sectors, &cdb[10]);
743 pr_debug("XCOPY: Built WRITE_16: LBA: %llu Sectors: %u Length: %u\n",
744 (unsigned long long)dst_lba, dst_sectors, length);
746 transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, NULL, length,
747 DMA_TO_DEVICE, 0, &xpt_cmd->sense_buffer[0]);
748 xop->dst_pt_cmd = xpt_cmd;
750 rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, dst_dev, &cdb[0],
753 struct se_cmd *src_cmd = &xop->src_pt_cmd->se_cmd;
755 * If the failure happened before the t_mem_list hand-off in
756 * target_xcopy_setup_pt_cmd(), Reset memory + clear flag so that
757 * core releases this memory on error during X-COPY WRITE I/O.
759 src_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
760 src_cmd->t_data_sg = xop->xop_data_sg;
761 src_cmd->t_data_nents = xop->xop_data_nents;
763 transport_generic_free_cmd(se_cmd, 0);
767 rc = target_xcopy_issue_pt_cmd(xpt_cmd);
769 se_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
770 transport_generic_free_cmd(se_cmd, 0);
777 static void target_xcopy_do_work(struct work_struct *work)
779 struct xcopy_op *xop = container_of(work, struct xcopy_op, xop_work);
780 struct se_device *src_dev = xop->src_dev, *dst_dev = xop->dst_dev;
781 struct se_cmd *ec_cmd = xop->xop_se_cmd;
782 sector_t src_lba = xop->src_lba, dst_lba = xop->dst_lba, end_lba;
783 unsigned int max_sectors;
785 unsigned short nolb = xop->nolb, cur_nolb, max_nolb, copied_nolb = 0;
787 end_lba = src_lba + nolb;
789 * Break up XCOPY I/O into hw_max_sectors sized I/O based on the
790 * smallest max_sectors between src_dev + dev_dev, or
792 max_sectors = min(src_dev->dev_attrib.hw_max_sectors,
793 dst_dev->dev_attrib.hw_max_sectors);
794 max_sectors = min_t(u32, max_sectors, XCOPY_MAX_SECTORS);
796 max_nolb = min_t(u16, max_sectors, ((u16)(~0U)));
798 pr_debug("target_xcopy_do_work: nolb: %hu, max_nolb: %hu end_lba: %llu\n",
799 nolb, max_nolb, (unsigned long long)end_lba);
800 pr_debug("target_xcopy_do_work: Starting src_lba: %llu, dst_lba: %llu\n",
801 (unsigned long long)src_lba, (unsigned long long)dst_lba);
803 while (src_lba < end_lba) {
804 cur_nolb = min(nolb, max_nolb);
806 pr_debug("target_xcopy_do_work: Calling read src_dev: %p src_lba: %llu,"
807 " cur_nolb: %hu\n", src_dev, (unsigned long long)src_lba, cur_nolb);
809 rc = target_xcopy_read_source(ec_cmd, xop, src_dev, src_lba, cur_nolb);
814 pr_debug("target_xcopy_do_work: Incremented READ src_lba to %llu\n",
815 (unsigned long long)src_lba);
817 pr_debug("target_xcopy_do_work: Calling write dst_dev: %p dst_lba: %llu,"
818 " cur_nolb: %hu\n", dst_dev, (unsigned long long)dst_lba, cur_nolb);
820 rc = target_xcopy_write_destination(ec_cmd, xop, dst_dev,
823 transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0);
828 pr_debug("target_xcopy_do_work: Incremented WRITE dst_lba to %llu\n",
829 (unsigned long long)dst_lba);
831 copied_nolb += cur_nolb;
834 transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0);
835 xop->dst_pt_cmd->se_cmd.se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
837 transport_generic_free_cmd(&xop->dst_pt_cmd->se_cmd, 0);
840 xcopy_pt_undepend_remotedev(xop);
843 pr_debug("target_xcopy_do_work: Final src_lba: %llu, dst_lba: %llu\n",
844 (unsigned long long)src_lba, (unsigned long long)dst_lba);
845 pr_debug("target_xcopy_do_work: Blocks copied: %hu, Bytes Copied: %u\n",
846 copied_nolb, copied_nolb * dst_dev->dev_attrib.block_size);
848 pr_debug("target_xcopy_do_work: Setting X-COPY GOOD status -> sending response\n");
849 target_complete_cmd(ec_cmd, SAM_STAT_GOOD);
853 xcopy_pt_undepend_remotedev(xop);
856 pr_warn("target_xcopy_do_work: Setting X-COPY CHECK_CONDITION -> sending response\n");
857 ec_cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
858 target_complete_cmd(ec_cmd, SAM_STAT_CHECK_CONDITION);
861 sense_reason_t target_do_xcopy(struct se_cmd *se_cmd)
863 struct se_device *dev = se_cmd->se_dev;
864 struct xcopy_op *xop = NULL;
865 unsigned char *p = NULL, *seg_desc;
866 unsigned int list_id, list_id_usage, sdll, inline_dl, sa;
867 sense_reason_t ret = TCM_INVALID_PARAMETER_LIST;
871 if (!dev->dev_attrib.emulate_3pc) {
872 pr_err("EXTENDED_COPY operation explicitly disabled\n");
873 return TCM_UNSUPPORTED_SCSI_OPCODE;
876 sa = se_cmd->t_task_cdb[1] & 0x1f;
878 pr_err("EXTENDED_COPY(LID4) not supported\n");
879 return TCM_UNSUPPORTED_SCSI_OPCODE;
882 xop = kzalloc(sizeof(struct xcopy_op), GFP_KERNEL);
884 pr_err("Unable to allocate xcopy_op\n");
885 return TCM_OUT_OF_RESOURCES;
887 xop->xop_se_cmd = se_cmd;
889 p = transport_kmap_data_sg(se_cmd);
891 pr_err("transport_kmap_data_sg() failed in target_do_xcopy\n");
893 return TCM_OUT_OF_RESOURCES;
897 list_id_usage = (p[1] & 0x18) >> 3;
900 * Determine TARGET DESCRIPTOR LIST LENGTH + SEGMENT DESCRIPTOR LIST LENGTH
902 tdll = get_unaligned_be16(&p[2]);
903 sdll = get_unaligned_be32(&p[8]);
905 inline_dl = get_unaligned_be32(&p[12]);
906 if (inline_dl != 0) {
907 pr_err("XCOPY with non zero inline data length\n");
911 pr_debug("Processing XCOPY with list_id: 0x%02x list_id_usage: 0x%02x"
912 " tdll: %hu sdll: %u inline_dl: %u\n", list_id, list_id_usage,
913 tdll, sdll, inline_dl);
915 rc = target_xcopy_parse_target_descriptors(se_cmd, xop, &p[16], tdll);
919 if (xop->src_dev->dev_attrib.block_size !=
920 xop->dst_dev->dev_attrib.block_size) {
921 pr_err("XCOPY: Non matching src_dev block_size: %u + dst_dev"
922 " block_size: %u currently unsupported\n",
923 xop->src_dev->dev_attrib.block_size,
924 xop->dst_dev->dev_attrib.block_size);
925 xcopy_pt_undepend_remotedev(xop);
926 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
930 pr_debug("XCOPY: Processed %d target descriptors, length: %u\n", rc,
931 rc * XCOPY_TARGET_DESC_LEN);
933 seg_desc += (rc * XCOPY_TARGET_DESC_LEN);
935 rc = target_xcopy_parse_segment_descriptors(se_cmd, xop, seg_desc, sdll);
937 xcopy_pt_undepend_remotedev(xop);
940 transport_kunmap_data_sg(se_cmd);
942 pr_debug("XCOPY: Processed %d segment descriptors, length: %u\n", rc,
943 rc * XCOPY_SEGMENT_DESC_LEN);
944 INIT_WORK(&xop->xop_work, target_xcopy_do_work);
945 queue_work(xcopy_wq, &xop->xop_work);
950 transport_kunmap_data_sg(se_cmd);
955 static sense_reason_t target_rcr_operating_parameters(struct se_cmd *se_cmd)
959 p = transport_kmap_data_sg(se_cmd);
961 pr_err("transport_kmap_data_sg failed in"
962 " target_rcr_operating_parameters\n");
963 return TCM_OUT_OF_RESOURCES;
966 if (se_cmd->data_length < 54) {
967 pr_err("Receive Copy Results Op Parameters length"
968 " too small: %u\n", se_cmd->data_length);
969 transport_kunmap_data_sg(se_cmd);
970 return TCM_INVALID_CDB_FIELD;
973 * Set SNLID=1 (Supports no List ID)
977 * MAXIMUM TARGET DESCRIPTOR COUNT
979 put_unaligned_be16(RCR_OP_MAX_TARGET_DESC_COUNT, &p[8]);
981 * MAXIMUM SEGMENT DESCRIPTOR COUNT
983 put_unaligned_be16(RCR_OP_MAX_SG_DESC_COUNT, &p[10]);
985 * MAXIMUM DESCRIPTOR LIST LENGTH
987 put_unaligned_be32(RCR_OP_MAX_DESC_LIST_LEN, &p[12]);
989 * MAXIMUM SEGMENT LENGTH
991 put_unaligned_be32(RCR_OP_MAX_SEGMENT_LEN, &p[16]);
993 * MAXIMUM INLINE DATA LENGTH for SA 0x04 (NOT SUPPORTED)
995 put_unaligned_be32(0x0, &p[20]);
999 put_unaligned_be32(0x0, &p[24]);
1001 * MAXIMUM STREAM DEVICE TRANSFER SIZE
1003 put_unaligned_be32(0x0, &p[28]);
1005 * TOTAL CONCURRENT COPIES
1007 put_unaligned_be16(RCR_OP_TOTAL_CONCURR_COPIES, &p[34]);
1009 * MAXIMUM CONCURRENT COPIES
1011 p[36] = RCR_OP_MAX_CONCURR_COPIES;
1013 * DATA SEGMENT GRANULARITY (log 2)
1015 p[37] = RCR_OP_DATA_SEG_GRAN_LOG2;
1017 * INLINE DATA GRANULARITY log 2)
1019 p[38] = RCR_OP_INLINE_DATA_GRAN_LOG2;
1021 * HELD DATA GRANULARITY
1023 p[39] = RCR_OP_HELD_DATA_GRAN_LOG2;
1025 * IMPLEMENTED DESCRIPTOR LIST LENGTH
1029 * List of implemented descriptor type codes (ordered)
1031 p[44] = 0x02; /* Copy Block to Block device */
1032 p[45] = 0xe4; /* Identification descriptor target descriptor */
1035 * AVAILABLE DATA (n-3)
1037 put_unaligned_be32(42, &p[0]);
1039 transport_kunmap_data_sg(se_cmd);
1040 target_complete_cmd(se_cmd, GOOD);
1042 return TCM_NO_SENSE;
1045 sense_reason_t target_do_receive_copy_results(struct se_cmd *se_cmd)
1047 unsigned char *cdb = &se_cmd->t_task_cdb[0];
1048 int sa = (cdb[1] & 0x1f), list_id = cdb[2];
1049 sense_reason_t rc = TCM_NO_SENSE;
1051 pr_debug("Entering target_do_receive_copy_results: SA: 0x%02x, List ID:"
1052 " 0x%02x, AL: %u\n", sa, list_id, se_cmd->data_length);
1055 pr_err("Receive Copy Results with non zero list identifier"
1056 " not supported\n");
1057 return TCM_INVALID_CDB_FIELD;
1061 case RCR_SA_OPERATING_PARAMETERS:
1062 rc = target_rcr_operating_parameters(se_cmd);
1064 case RCR_SA_COPY_STATUS:
1065 case RCR_SA_RECEIVE_DATA:
1066 case RCR_SA_FAILED_SEGMENT_DETAILS:
1068 pr_err("Unsupported SA for receive copy results: 0x%02x\n", sa);
1069 return TCM_INVALID_CDB_FIELD;