| /******************************************************************************* |
| * Filename: target_core_xcopy.c |
| * |
| * This file contains support for SPC-4 Extended-Copy offload with generic |
| * TCM backends. |
| * |
| * Copyright (c) 2011-2013 Datera, Inc. All rights reserved. |
| * |
| * Author: |
| * Nicholas A. Bellinger <nab@daterainc.com> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| ******************************************************************************/ |
| |
| #include <linux/slab.h> |
| #include <linux/spinlock.h> |
| #include <linux/list.h> |
| #include <linux/configfs.h> |
| #include <linux/ratelimit.h> |
| #include <scsi/scsi_proto.h> |
| #include <asm/unaligned.h> |
| |
| #include <target/target_core_base.h> |
| #include <target/target_core_backend.h> |
| #include <target/target_core_fabric.h> |
| |
| #include "target_core_internal.h" |
| #include "target_core_pr.h" |
| #include "target_core_ua.h" |
| #include "target_core_xcopy.h" |
| |
| static struct workqueue_struct *xcopy_wq = NULL; |
| |
| static sense_reason_t target_parse_xcopy_cmd(struct xcopy_op *xop); |
| |
| static int target_xcopy_gen_naa_ieee(struct se_device *dev, unsigned char *buf) |
| { |
| int off = 0; |
| |
| buf[off++] = (0x6 << 4); |
| buf[off++] = 0x01; |
| buf[off++] = 0x40; |
| buf[off] = (0x5 << 4); |
| |
| spc_parse_naa_6h_vendor_specific(dev, &buf[off]); |
| return 0; |
| } |
| |
| struct xcopy_dev_search_info { |
| const unsigned char *dev_wwn; |
| struct se_device *found_dev; |
| }; |
| |
| static int target_xcopy_locate_se_dev_e4_iter(struct se_device *se_dev, |
| void *data) |
| { |
| struct xcopy_dev_search_info *info = data; |
| unsigned char tmp_dev_wwn[XCOPY_NAA_IEEE_REGEX_LEN]; |
| int rc; |
| |
| if (!se_dev->dev_attrib.emulate_3pc) |
| return 0; |
| |
| memset(&tmp_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN); |
| target_xcopy_gen_naa_ieee(se_dev, &tmp_dev_wwn[0]); |
| |
| rc = memcmp(&tmp_dev_wwn[0], info->dev_wwn, XCOPY_NAA_IEEE_REGEX_LEN); |
| if (rc != 0) |
| return 0; |
| |
| info->found_dev = se_dev; |
| pr_debug("XCOPY 0xe4: located se_dev: %p\n", se_dev); |
| |
| rc = target_depend_item(&se_dev->dev_group.cg_item); |
| if (rc != 0) { |
| pr_err("configfs_depend_item attempt failed: %d for se_dev: %p\n", |
| rc, se_dev); |
| return rc; |
| } |
| |
| pr_debug("Called configfs_depend_item for se_dev: %p se_dev->se_dev_group: %p\n", |
| se_dev, &se_dev->dev_group); |
| return 1; |
| } |
| |
| static int target_xcopy_locate_se_dev_e4(const unsigned char *dev_wwn, |
| struct se_device **found_dev) |
| { |
| struct xcopy_dev_search_info info; |
| int ret; |
| |
| memset(&info, 0, sizeof(info)); |
| info.dev_wwn = dev_wwn; |
| |
| ret = target_for_each_device(target_xcopy_locate_se_dev_e4_iter, &info); |
| if (ret == 1) { |
| *found_dev = info.found_dev; |
| return 0; |
| } else { |
| pr_debug_ratelimited("Unable to locate 0xe4 descriptor for EXTENDED_COPY\n"); |
| return -EINVAL; |
| } |
| } |
| |
| static int target_xcopy_parse_tiddesc_e4(struct se_cmd *se_cmd, struct xcopy_op *xop, |
| unsigned char *p, unsigned short cscd_index) |
| { |
| unsigned char *desc = p; |
| unsigned short ript; |
| u8 desig_len; |
| /* |
| * Extract RELATIVE INITIATOR PORT IDENTIFIER |
| */ |
| ript = get_unaligned_be16(&desc[2]); |
| pr_debug("XCOPY 0xe4: RELATIVE INITIATOR PORT IDENTIFIER: %hu\n", ript); |
| /* |
| * Check for supported code set, association, and designator type |
| */ |
| if ((desc[4] & 0x0f) != 0x1) { |
| pr_err("XCOPY 0xe4: code set of non binary type not supported\n"); |
| return -EINVAL; |
| } |
| if ((desc[5] & 0x30) != 0x00) { |
| pr_err("XCOPY 0xe4: association other than LUN not supported\n"); |
| return -EINVAL; |
| } |
| if ((desc[5] & 0x0f) != 0x3) { |
| pr_err("XCOPY 0xe4: designator type unsupported: 0x%02x\n", |
| (desc[5] & 0x0f)); |
| return -EINVAL; |
| } |
| /* |
| * Check for matching 16 byte length for NAA IEEE Registered Extended |
| * Assigned designator |
| */ |
| desig_len = desc[7]; |
| if (desig_len != 16) { |
| pr_err("XCOPY 0xe4: invalid desig_len: %d\n", (int)desig_len); |
| return -EINVAL; |
| } |
| pr_debug("XCOPY 0xe4: desig_len: %d\n", (int)desig_len); |
| /* |
| * Check for NAA IEEE Registered Extended Assigned header.. |
| */ |
| if ((desc[8] & 0xf0) != 0x60) { |
| pr_err("XCOPY 0xe4: Unsupported DESIGNATOR TYPE: 0x%02x\n", |
| (desc[8] & 0xf0)); |
| return -EINVAL; |
| } |
| |
| if (cscd_index != xop->stdi && cscd_index != xop->dtdi) { |
| pr_debug("XCOPY 0xe4: ignoring CSCD entry %d - neither src nor " |
| "dest\n", cscd_index); |
| return 0; |
| } |
| |
| if (cscd_index == xop->stdi) { |
| memcpy(&xop->src_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN); |
| /* |
| * Determine if the source designator matches the local device |
| */ |
| if (!memcmp(&xop->local_dev_wwn[0], &xop->src_tid_wwn[0], |
| XCOPY_NAA_IEEE_REGEX_LEN)) { |
| xop->op_origin = XCOL_SOURCE_RECV_OP; |
| xop->src_dev = se_cmd->se_dev; |
| pr_debug("XCOPY 0xe4: Set xop->src_dev %p from source" |
| " received xop\n", xop->src_dev); |
| } |
| } |
| |
| if (cscd_index == xop->dtdi) { |
| memcpy(&xop->dst_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN); |
| /* |
| * Determine if the destination designator matches the local |
| * device. If @cscd_index corresponds to both source (stdi) and |
| * destination (dtdi), or dtdi comes after stdi, then |
| * XCOL_DEST_RECV_OP wins. |
| */ |
| if (!memcmp(&xop->local_dev_wwn[0], &xop->dst_tid_wwn[0], |
| XCOPY_NAA_IEEE_REGEX_LEN)) { |
| xop->op_origin = XCOL_DEST_RECV_OP; |
| xop->dst_dev = se_cmd->se_dev; |
| pr_debug("XCOPY 0xe4: Set xop->dst_dev: %p from destination" |
| " received xop\n", xop->dst_dev); |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int target_xcopy_parse_target_descriptors(struct se_cmd *se_cmd, |
| struct xcopy_op *xop, unsigned char *p, |
| unsigned short tdll, sense_reason_t *sense_ret) |
| { |
| struct se_device *local_dev = se_cmd->se_dev; |
| unsigned char *desc = p; |
| int offset = tdll % XCOPY_TARGET_DESC_LEN, rc; |
| unsigned short cscd_index = 0; |
| unsigned short start = 0; |
| |
| *sense_ret = TCM_INVALID_PARAMETER_LIST; |
| |
| if (offset != 0) { |
| pr_err("XCOPY target descriptor list length is not" |
| " multiple of %d\n", XCOPY_TARGET_DESC_LEN); |
| *sense_ret = TCM_UNSUPPORTED_TARGET_DESC_TYPE_CODE; |
| return -EINVAL; |
| } |
| if (tdll > RCR_OP_MAX_TARGET_DESC_COUNT * XCOPY_TARGET_DESC_LEN) { |
| pr_err("XCOPY target descriptor supports a maximum" |
| " two src/dest descriptors, tdll: %hu too large..\n", tdll); |
| /* spc4r37 6.4.3.4 CSCD DESCRIPTOR LIST LENGTH field */ |
| *sense_ret = TCM_TOO_MANY_TARGET_DESCS; |
| return -EINVAL; |
| } |
| /* |
| * Generate an IEEE Registered Extended designator based upon the |
| * se_device the XCOPY was received upon.. |
| */ |
| memset(&xop->local_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN); |
| target_xcopy_gen_naa_ieee(local_dev, &xop->local_dev_wwn[0]); |
| |
| while (start < tdll) { |
| /* |
| * Check target descriptor identification with 0xE4 type, and |
| * compare the current index with the CSCD descriptor IDs in |
| * the segment descriptor. Use VPD 0x83 WWPN matching .. |
| */ |
| switch (desc[0]) { |
| case 0xe4: |
| rc = target_xcopy_parse_tiddesc_e4(se_cmd, xop, |
| &desc[0], cscd_index); |
| if (rc != 0) |
| goto out; |
| start += XCOPY_TARGET_DESC_LEN; |
| desc += XCOPY_TARGET_DESC_LEN; |
| cscd_index++; |
| break; |
| default: |
| pr_err("XCOPY unsupported descriptor type code:" |
| " 0x%02x\n", desc[0]); |
| *sense_ret = TCM_UNSUPPORTED_TARGET_DESC_TYPE_CODE; |
| goto out; |
| } |
| } |
| |
| switch (xop->op_origin) { |
| case XCOL_SOURCE_RECV_OP: |
| rc = target_xcopy_locate_se_dev_e4(xop->dst_tid_wwn, |
| &xop->dst_dev); |
| break; |
| case XCOL_DEST_RECV_OP: |
| rc = target_xcopy_locate_se_dev_e4(xop->src_tid_wwn, |
| &xop->src_dev); |
| break; |
| default: |
| pr_err("XCOPY CSCD descriptor IDs not found in CSCD list - " |
| "stdi: %hu dtdi: %hu\n", xop->stdi, xop->dtdi); |
| rc = -EINVAL; |
| break; |
| } |
| /* |
| * If a matching IEEE NAA 0x83 descriptor for the requested device |
| * is not located on this node, return COPY_ABORTED with ASQ/ASQC |
| * 0x0d/0x02 - COPY_TARGET_DEVICE_NOT_REACHABLE to request the |
| * initiator to fall back to normal copy method. |
| */ |
| if (rc < 0) { |
| *sense_ret = TCM_COPY_TARGET_DEVICE_NOT_REACHABLE; |
| goto out; |
| } |
| |
| pr_debug("XCOPY TGT desc: Source dev: %p NAA IEEE WWN: 0x%16phN\n", |
| xop->src_dev, &xop->src_tid_wwn[0]); |
| pr_debug("XCOPY TGT desc: Dest dev: %p NAA IEEE WWN: 0x%16phN\n", |
| xop->dst_dev, &xop->dst_tid_wwn[0]); |
| |
| return cscd_index; |
| |
| out: |
| return -EINVAL; |
| } |
| |
| static int target_xcopy_parse_segdesc_02(struct se_cmd *se_cmd, struct xcopy_op *xop, |
| unsigned char *p) |
| { |
| unsigned char *desc = p; |
| int dc = (desc[1] & 0x02); |
| unsigned short desc_len; |
| |
| desc_len = get_unaligned_be16(&desc[2]); |
| if (desc_len != 0x18) { |
| pr_err("XCOPY segment desc 0x02: Illegal desc_len:" |
| " %hu\n", desc_len); |
| return -EINVAL; |
| } |
| |
| xop->stdi = get_unaligned_be16(&desc[4]); |
| xop->dtdi = get_unaligned_be16(&desc[6]); |
| |
| if (xop->stdi > XCOPY_CSCD_DESC_ID_LIST_OFF_MAX || |
| xop->dtdi > XCOPY_CSCD_DESC_ID_LIST_OFF_MAX) { |
| pr_err("XCOPY segment desc 0x02: unsupported CSCD ID > 0x%x; stdi: %hu dtdi: %hu\n", |
| XCOPY_CSCD_DESC_ID_LIST_OFF_MAX, xop->stdi, xop->dtdi); |
| return -EINVAL; |
| } |
| |
| pr_debug("XCOPY seg desc 0x02: desc_len: %hu stdi: %hu dtdi: %hu, DC: %d\n", |
| desc_len, xop->stdi, xop->dtdi, dc); |
| |
| xop->nolb = get_unaligned_be16(&desc[10]); |
| xop->src_lba = get_unaligned_be64(&desc[12]); |
| xop->dst_lba = get_unaligned_be64(&desc[20]); |
| pr_debug("XCOPY seg desc 0x02: nolb: %hu src_lba: %llu dst_lba: %llu\n", |
| xop->nolb, (unsigned long long)xop->src_lba, |
| (unsigned long long)xop->dst_lba); |
| |
| if (dc != 0) { |
| xop->dbl = get_unaligned_be24(&desc[29]); |
| |
| pr_debug("XCOPY seg desc 0x02: DC=1 w/ dbl: %u\n", xop->dbl); |
| } |
| return 0; |
| } |
| |
| static int target_xcopy_parse_segment_descriptors(struct se_cmd *se_cmd, |
| struct xcopy_op *xop, unsigned char *p, |
| unsigned int sdll, sense_reason_t *sense_ret) |
| { |
| unsigned char *desc = p; |
| unsigned int start = 0; |
| int offset = sdll % XCOPY_SEGMENT_DESC_LEN, rc, ret = 0; |
| |
| *sense_ret = TCM_INVALID_PARAMETER_LIST; |
| |
| if (offset != 0) { |
| pr_err("XCOPY segment descriptor list length is not" |
| " multiple of %d\n", XCOPY_SEGMENT_DESC_LEN); |
| *sense_ret = TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE; |
| return -EINVAL; |
| } |
| if (sdll > RCR_OP_MAX_SG_DESC_COUNT * XCOPY_SEGMENT_DESC_LEN) { |
| pr_err("XCOPY supports %u segment descriptor(s), sdll: %u too" |
| " large..\n", RCR_OP_MAX_SG_DESC_COUNT, sdll); |
| /* spc4r37 6.4.3.5 SEGMENT DESCRIPTOR LIST LENGTH field */ |
| *sense_ret = TCM_TOO_MANY_SEGMENT_DESCS; |
| return -EINVAL; |
| } |
| |
| while (start < sdll) { |
| /* |
| * Check segment descriptor type code for block -> block |
| */ |
| switch (desc[0]) { |
| case 0x02: |
| rc = target_xcopy_parse_segdesc_02(se_cmd, xop, desc); |
| if (rc < 0) |
| goto out; |
| |
| ret++; |
| start += XCOPY_SEGMENT_DESC_LEN; |
| desc += XCOPY_SEGMENT_DESC_LEN; |
| break; |
| default: |
| pr_err("XCOPY unsupported segment descriptor" |
| "type: 0x%02x\n", desc[0]); |
| *sense_ret = TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE; |
| goto out; |
| } |
| } |
| |
| return ret; |
| |
| out: |
| return -EINVAL; |
| } |
| |
| /* |
| * Start xcopy_pt ops |
| */ |
| |
| struct xcopy_pt_cmd { |
| bool remote_port; |
| struct se_cmd se_cmd; |
| struct completion xpt_passthrough_sem; |
| unsigned char sense_buffer[TRANSPORT_SENSE_BUFFER]; |
| }; |
| |
| struct se_portal_group xcopy_pt_tpg; |
| static struct se_session xcopy_pt_sess; |
| static struct se_node_acl xcopy_pt_nacl; |
| |
| static int xcopy_pt_get_cmd_state(struct se_cmd *se_cmd) |
| { |
| return 0; |
| } |
| |
| static void xcopy_pt_undepend_remotedev(struct xcopy_op *xop) |
| { |
| struct se_device *remote_dev; |
| |
| if (xop->op_origin == XCOL_SOURCE_RECV_OP) |
| remote_dev = xop->dst_dev; |
| else |
| remote_dev = xop->src_dev; |
| |
| pr_debug("Calling configfs_undepend_item for" |
| " remote_dev: %p remote_dev->dev_group: %p\n", |
| remote_dev, &remote_dev->dev_group.cg_item); |
| |
| target_undepend_item(&remote_dev->dev_group.cg_item); |
| } |
| |
| static void xcopy_pt_release_cmd(struct se_cmd *se_cmd) |
| { |
| struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd, |
| struct xcopy_pt_cmd, se_cmd); |
| |
| kfree(xpt_cmd); |
| } |
| |
| static int xcopy_pt_check_stop_free(struct se_cmd *se_cmd) |
| { |
| struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd, |
| struct xcopy_pt_cmd, se_cmd); |
| |
| complete(&xpt_cmd->xpt_passthrough_sem); |
| return 0; |
| } |
| |
| static int xcopy_pt_write_pending(struct se_cmd *se_cmd) |
| { |
| return 0; |
| } |
| |
| static int xcopy_pt_queue_data_in(struct se_cmd *se_cmd) |
| { |
| return 0; |
| } |
| |
| static int xcopy_pt_queue_status(struct se_cmd *se_cmd) |
| { |
| return 0; |
| } |
| |
| static const struct target_core_fabric_ops xcopy_pt_tfo = { |
| .fabric_name = "xcopy-pt", |
| .get_cmd_state = xcopy_pt_get_cmd_state, |
| .release_cmd = xcopy_pt_release_cmd, |
| .check_stop_free = xcopy_pt_check_stop_free, |
| .write_pending = xcopy_pt_write_pending, |
| .queue_data_in = xcopy_pt_queue_data_in, |
| .queue_status = xcopy_pt_queue_status, |
| }; |
| |
| /* |
| * End xcopy_pt_ops |
| */ |
| |
| int target_xcopy_setup_pt(void) |
| { |
| int ret; |
| |
| xcopy_wq = alloc_workqueue("xcopy_wq", WQ_MEM_RECLAIM, 0); |
| if (!xcopy_wq) { |
| pr_err("Unable to allocate xcopy_wq\n"); |
| return -ENOMEM; |
| } |
| |
| memset(&xcopy_pt_tpg, 0, sizeof(struct se_portal_group)); |
| INIT_LIST_HEAD(&xcopy_pt_tpg.se_tpg_node); |
| INIT_LIST_HEAD(&xcopy_pt_tpg.acl_node_list); |
| INIT_LIST_HEAD(&xcopy_pt_tpg.tpg_sess_list); |
| |
| xcopy_pt_tpg.se_tpg_tfo = &xcopy_pt_tfo; |
| |
| memset(&xcopy_pt_nacl, 0, sizeof(struct se_node_acl)); |
| INIT_LIST_HEAD(&xcopy_pt_nacl.acl_list); |
| INIT_LIST_HEAD(&xcopy_pt_nacl.acl_sess_list); |
| memset(&xcopy_pt_sess, 0, sizeof(struct se_session)); |
| ret = transport_init_session(&xcopy_pt_sess); |
| if (ret < 0) |
| return ret; |
| |
| xcopy_pt_nacl.se_tpg = &xcopy_pt_tpg; |
| xcopy_pt_nacl.nacl_sess = &xcopy_pt_sess; |
| |
| xcopy_pt_sess.se_tpg = &xcopy_pt_tpg; |
| xcopy_pt_sess.se_node_acl = &xcopy_pt_nacl; |
| |
| return 0; |
| } |
| |
| void target_xcopy_release_pt(void) |
| { |
| if (xcopy_wq) |
| destroy_workqueue(xcopy_wq); |
| } |
| |
| static void target_xcopy_setup_pt_port( |
| struct xcopy_pt_cmd *xpt_cmd, |
| struct xcopy_op *xop, |
| bool remote_port) |
| { |
| struct se_cmd *ec_cmd = xop->xop_se_cmd; |
| struct se_cmd *pt_cmd = &xpt_cmd->se_cmd; |
| |
| if (xop->op_origin == XCOL_SOURCE_RECV_OP) { |
| /* |
| * Honor destination port reservations for X-COPY PUSH emulation |
| * when CDB is received on local source port, and READs blocks to |
| * WRITE on remote destination port. |
| */ |
| if (remote_port) { |
| xpt_cmd->remote_port = remote_port; |
| } else { |
| pt_cmd->se_lun = ec_cmd->se_lun; |
| pt_cmd->se_dev = ec_cmd->se_dev; |
| |
| pr_debug("Honoring local SRC port from ec_cmd->se_dev:" |
| " %p\n", pt_cmd->se_dev); |
| pt_cmd->se_lun = ec_cmd->se_lun; |
| pr_debug("Honoring local SRC port from ec_cmd->se_lun: %p\n", |
| pt_cmd->se_lun); |
| } |
| } else { |
| /* |
| * Honor source port reservation for X-COPY PULL emulation |
| * when CDB is received on local desintation port, and READs |
| * blocks from the remote source port to WRITE on local |
| * destination port. |
| */ |
| if (remote_port) { |
| xpt_cmd->remote_port = remote_port; |
| } else { |
| pt_cmd->se_lun = ec_cmd->se_lun; |
| pt_cmd->se_dev = ec_cmd->se_dev; |
| |
| pr_debug("Honoring local DST port from ec_cmd->se_dev:" |
| " %p\n", pt_cmd->se_dev); |
| pt_cmd->se_lun = ec_cmd->se_lun; |
| pr_debug("Honoring local DST port from ec_cmd->se_lun: %p\n", |
| pt_cmd->se_lun); |
| } |
| } |
| } |
| |
| static void target_xcopy_init_pt_lun(struct se_device *se_dev, |
| struct se_cmd *pt_cmd, bool remote_port) |
| { |
| /* |
| * Don't allocate + init an pt_cmd->se_lun if honoring local port for |
| * reservations. The pt_cmd->se_lun pointer will be setup from within |
| * target_xcopy_setup_pt_port() |
| */ |
| if (remote_port) { |
| pr_debug("Setup emulated se_dev: %p from se_dev\n", |
| pt_cmd->se_dev); |
| pt_cmd->se_lun = &se_dev->xcopy_lun; |
| pt_cmd->se_dev = se_dev; |
| } |
| |
| pt_cmd->se_cmd_flags |= SCF_SE_LUN_CMD; |
| } |
| |
| static int target_xcopy_setup_pt_cmd( |
| struct xcopy_pt_cmd *xpt_cmd, |
| struct xcopy_op *xop, |
| struct se_device *se_dev, |
| unsigned char *cdb, |
| bool remote_port, |
| bool alloc_mem) |
| { |
| struct se_cmd *cmd = &xpt_cmd->se_cmd; |
| sense_reason_t sense_rc; |
| int ret = 0, rc; |
| /* |
| * Setup LUN+port to honor reservations based upon xop->op_origin for |
| * X-COPY PUSH or X-COPY PULL based upon where the CDB was received. |
| */ |
| target_xcopy_init_pt_lun(se_dev, cmd, remote_port); |
| target_xcopy_setup_pt_port(xpt_cmd, xop, remote_port); |
| |
| cmd->tag = 0; |
| sense_rc = target_setup_cmd_from_cdb(cmd, cdb); |
| if (sense_rc) { |
| ret = -EINVAL; |
| goto out; |
| } |
| |
| if (alloc_mem) { |
| rc = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents, |
| cmd->data_length, false, false); |
| if (rc < 0) { |
| ret = rc; |
| goto out; |
| } |
| /* |
| * Set this bit so that transport_free_pages() allows the |
| * caller to release SGLs + physical memory allocated by |
| * transport_generic_get_mem().. |
| */ |
| cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC; |
| } else { |
| /* |
| * Here the previously allocated SGLs for the internal READ |
| * are mapped zero-copy to the internal WRITE. |
| */ |
| sense_rc = transport_generic_map_mem_to_cmd(cmd, |
| xop->xop_data_sg, xop->xop_data_nents, |
| NULL, 0); |
| if (sense_rc) { |
| ret = -EINVAL; |
| goto out; |
| } |
| |
| pr_debug("Setup PASSTHROUGH_NOALLOC t_data_sg: %p t_data_nents:" |
| " %u\n", cmd->t_data_sg, cmd->t_data_nents); |
| } |
| |
| return 0; |
| |
| out: |
| return ret; |
| } |
| |
| static int target_xcopy_issue_pt_cmd(struct xcopy_pt_cmd *xpt_cmd) |
| { |
| struct se_cmd *se_cmd = &xpt_cmd->se_cmd; |
| sense_reason_t sense_rc; |
| |
| sense_rc = transport_generic_new_cmd(se_cmd); |
| if (sense_rc) |
| return -EINVAL; |
| |
| if (se_cmd->data_direction == DMA_TO_DEVICE) |
| target_execute_cmd(se_cmd); |
| |
| wait_for_completion_interruptible(&xpt_cmd->xpt_passthrough_sem); |
| |
| pr_debug("target_xcopy_issue_pt_cmd(): SCSI status: 0x%02x\n", |
| se_cmd->scsi_status); |
| |
| return (se_cmd->scsi_status) ? -EINVAL : 0; |
| } |
| |
| static int target_xcopy_read_source( |
| struct se_cmd *ec_cmd, |
| struct xcopy_op *xop, |
| struct se_device *src_dev, |
| sector_t src_lba, |
| u32 src_sectors) |
| { |
| struct xcopy_pt_cmd *xpt_cmd; |
| struct se_cmd *se_cmd; |
| u32 length = (src_sectors * src_dev->dev_attrib.block_size); |
| int rc; |
| unsigned char cdb[16]; |
| bool remote_port = (xop->op_origin == XCOL_DEST_RECV_OP); |
| |
| xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL); |
| if (!xpt_cmd) { |
| pr_err("Unable to allocate xcopy_pt_cmd\n"); |
| return -ENOMEM; |
| } |
| init_completion(&xpt_cmd->xpt_passthrough_sem); |
| se_cmd = &xpt_cmd->se_cmd; |
| |
| memset(&cdb[0], 0, 16); |
| cdb[0] = READ_16; |
| put_unaligned_be64(src_lba, &cdb[2]); |
| put_unaligned_be32(src_sectors, &cdb[10]); |
| pr_debug("XCOPY: Built READ_16: LBA: %llu Sectors: %u Length: %u\n", |
| (unsigned long long)src_lba, src_sectors, length); |
| |
| transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, &xcopy_pt_sess, length, |
| DMA_FROM_DEVICE, 0, &xpt_cmd->sense_buffer[0]); |
| xop->src_pt_cmd = xpt_cmd; |
| |
| rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, src_dev, &cdb[0], |
| remote_port, true); |
| if (rc < 0) { |
| ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status; |
| transport_generic_free_cmd(se_cmd, 0); |
| return rc; |
| } |
| |
| xop->xop_data_sg = se_cmd->t_data_sg; |
| xop->xop_data_nents = se_cmd->t_data_nents; |
| pr_debug("XCOPY-READ: Saved xop->xop_data_sg: %p, num: %u for READ" |
| " memory\n", xop->xop_data_sg, xop->xop_data_nents); |
| |
| rc = target_xcopy_issue_pt_cmd(xpt_cmd); |
| if (rc < 0) { |
| ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status; |
| transport_generic_free_cmd(se_cmd, 0); |
| return rc; |
| } |
| /* |
| * Clear off the allocated t_data_sg, that has been saved for |
| * zero-copy WRITE submission reuse in struct xcopy_op.. |
| */ |
| se_cmd->t_data_sg = NULL; |
| se_cmd->t_data_nents = 0; |
| |
| return 0; |
| } |
| |
| static int target_xcopy_write_destination( |
| struct se_cmd *ec_cmd, |
| struct xcopy_op *xop, |
| struct se_device *dst_dev, |
| sector_t dst_lba, |
| u32 dst_sectors) |
| { |
| struct xcopy_pt_cmd *xpt_cmd; |
| struct se_cmd *se_cmd; |
| u32 length = (dst_sectors * dst_dev->dev_attrib.block_size); |
| int rc; |
| unsigned char cdb[16]; |
| bool remote_port = (xop->op_origin == XCOL_SOURCE_RECV_OP); |
| |
| xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL); |
| if (!xpt_cmd) { |
| pr_err("Unable to allocate xcopy_pt_cmd\n"); |
| return -ENOMEM; |
| } |
| init_completion(&xpt_cmd->xpt_passthrough_sem); |
| se_cmd = &xpt_cmd->se_cmd; |
| |
| memset(&cdb[0], 0, 16); |
| cdb[0] = WRITE_16; |
| put_unaligned_be64(dst_lba, &cdb[2]); |
| put_unaligned_be32(dst_sectors, &cdb[10]); |
| pr_debug("XCOPY: Built WRITE_16: LBA: %llu Sectors: %u Length: %u\n", |
| (unsigned long long)dst_lba, dst_sectors, length); |
| |
| transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, &xcopy_pt_sess, length, |
| DMA_TO_DEVICE, 0, &xpt_cmd->sense_buffer[0]); |
| xop->dst_pt_cmd = xpt_cmd; |
| |
| rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, dst_dev, &cdb[0], |
| remote_port, false); |
| if (rc < 0) { |
| struct se_cmd *src_cmd = &xop->src_pt_cmd->se_cmd; |
| ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status; |
| /* |
| * If the failure happened before the t_mem_list hand-off in |
| * target_xcopy_setup_pt_cmd(), Reset memory + clear flag so that |
| * core releases this memory on error during X-COPY WRITE I/O. |
| */ |
| src_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC; |
| src_cmd->t_data_sg = xop->xop_data_sg; |
| src_cmd->t_data_nents = xop->xop_data_nents; |
| |
| transport_generic_free_cmd(se_cmd, 0); |
| return rc; |
| } |
| |
| rc = target_xcopy_issue_pt_cmd(xpt_cmd); |
| if (rc < 0) { |
| ec_cmd->scsi_status = xpt_cmd->se_cmd.scsi_status; |
| se_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC; |
| transport_generic_free_cmd(se_cmd, 0); |
| return rc; |
| } |
| |
| return 0; |
| } |
| |
| static void target_xcopy_do_work(struct work_struct *work) |
| { |
| struct xcopy_op *xop = container_of(work, struct xcopy_op, xop_work); |
| struct se_cmd *ec_cmd = xop->xop_se_cmd; |
| struct se_device *src_dev, *dst_dev; |
| sector_t src_lba, dst_lba, end_lba; |
| unsigned int max_sectors; |
| int rc = 0; |
| unsigned short nolb, cur_nolb, max_nolb, copied_nolb = 0; |
| |
| if (target_parse_xcopy_cmd(xop) != TCM_NO_SENSE) |
| goto err_free; |
| |
| if (WARN_ON_ONCE(!xop->src_dev) || WARN_ON_ONCE(!xop->dst_dev)) |
| goto err_free; |
| |
| src_dev = xop->src_dev; |
| dst_dev = xop->dst_dev; |
| src_lba = xop->src_lba; |
| dst_lba = xop->dst_lba; |
| nolb = xop->nolb; |
| end_lba = src_lba + nolb; |
| /* |
| * Break up XCOPY I/O into hw_max_sectors sized I/O based on the |
| * smallest max_sectors between src_dev + dev_dev, or |
| */ |
| max_sectors = min(src_dev->dev_attrib.hw_max_sectors, |
| dst_dev->dev_attrib.hw_max_sectors); |
| max_sectors = min_t(u32, max_sectors, XCOPY_MAX_SECTORS); |
| |
| max_nolb = min_t(u16, max_sectors, ((u16)(~0U))); |
| |
| pr_debug("target_xcopy_do_work: nolb: %hu, max_nolb: %hu end_lba: %llu\n", |
| nolb, max_nolb, (unsigned long long)end_lba); |
| pr_debug("target_xcopy_do_work: Starting src_lba: %llu, dst_lba: %llu\n", |
| (unsigned long long)src_lba, (unsigned long long)dst_lba); |
| |
| while (src_lba < end_lba) { |
| cur_nolb = min(nolb, max_nolb); |
| |
| pr_debug("target_xcopy_do_work: Calling read src_dev: %p src_lba: %llu," |
| " cur_nolb: %hu\n", src_dev, (unsigned long long)src_lba, cur_nolb); |
| |
| rc = target_xcopy_read_source(ec_cmd, xop, src_dev, src_lba, cur_nolb); |
| if (rc < 0) |
| goto out; |
| |
| src_lba += cur_nolb; |
| pr_debug("target_xcopy_do_work: Incremented READ src_lba to %llu\n", |
| (unsigned long long)src_lba); |
| |
| pr_debug("target_xcopy_do_work: Calling write dst_dev: %p dst_lba: %llu," |
| " cur_nolb: %hu\n", dst_dev, (unsigned long long)dst_lba, cur_nolb); |
| |
| rc = target_xcopy_write_destination(ec_cmd, xop, dst_dev, |
| dst_lba, cur_nolb); |
| if (rc < 0) { |
| transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0); |
| goto out; |
| } |
| |
| dst_lba += cur_nolb; |
| pr_debug("target_xcopy_do_work: Incremented WRITE dst_lba to %llu\n", |
| (unsigned long long)dst_lba); |
| |
| copied_nolb += cur_nolb; |
| nolb -= cur_nolb; |
| |
| transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0); |
| xop->dst_pt_cmd->se_cmd.se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC; |
| |
| transport_generic_free_cmd(&xop->dst_pt_cmd->se_cmd, 0); |
| } |
| |
| xcopy_pt_undepend_remotedev(xop); |
| kfree(xop); |
| |
| pr_debug("target_xcopy_do_work: Final src_lba: %llu, dst_lba: %llu\n", |
| (unsigned long long)src_lba, (unsigned long long)dst_lba); |
| pr_debug("target_xcopy_do_work: Blocks copied: %hu, Bytes Copied: %u\n", |
| copied_nolb, copied_nolb * dst_dev->dev_attrib.block_size); |
| |
| pr_debug("target_xcopy_do_work: Setting X-COPY GOOD status -> sending response\n"); |
| target_complete_cmd(ec_cmd, SAM_STAT_GOOD); |
| return; |
| |
| out: |
| xcopy_pt_undepend_remotedev(xop); |
| |
| err_free: |
| kfree(xop); |
| /* |
| * Don't override an error scsi status if it has already been set |
| */ |
| if (ec_cmd->scsi_status == SAM_STAT_GOOD) { |
| pr_warn_ratelimited("target_xcopy_do_work: rc: %d, Setting X-COPY" |
| " CHECK_CONDITION -> sending response\n", rc); |
| ec_cmd->scsi_status = SAM_STAT_CHECK_CONDITION; |
| } |
| target_complete_cmd(ec_cmd, ec_cmd->scsi_status); |
| } |
| |
| /* |
| * Returns TCM_NO_SENSE upon success or a sense code != TCM_NO_SENSE if parsing |
| * fails. |
| */ |
| static sense_reason_t target_parse_xcopy_cmd(struct xcopy_op *xop) |
| { |
| struct se_cmd *se_cmd = xop->xop_se_cmd; |
| unsigned char *p = NULL, *seg_desc; |
| unsigned int list_id, list_id_usage, sdll, inline_dl; |
| sense_reason_t ret = TCM_INVALID_PARAMETER_LIST; |
| int rc; |
| unsigned short tdll; |
| |
| p = transport_kmap_data_sg(se_cmd); |
| if (!p) { |
| pr_err("transport_kmap_data_sg() failed in target_do_xcopy\n"); |
| return TCM_OUT_OF_RESOURCES; |
| } |
| |
| list_id = p[0]; |
| list_id_usage = (p[1] & 0x18) >> 3; |
| |
| /* |
| * Determine TARGET DESCRIPTOR LIST LENGTH + SEGMENT DESCRIPTOR LIST LENGTH |
| */ |
| tdll = get_unaligned_be16(&p[2]); |
| sdll = get_unaligned_be32(&p[8]); |
| if (tdll + sdll > RCR_OP_MAX_DESC_LIST_LEN) { |
| pr_err("XCOPY descriptor list length %u exceeds maximum %u\n", |
| tdll + sdll, RCR_OP_MAX_DESC_LIST_LEN); |
| ret = TCM_PARAMETER_LIST_LENGTH_ERROR; |
| goto out; |
| } |
| |
| inline_dl = get_unaligned_be32(&p[12]); |
| if (inline_dl != 0) { |
| pr_err("XCOPY with non zero inline data length\n"); |
| goto out; |
| } |
| |
| if (se_cmd->data_length < (XCOPY_HDR_LEN + tdll + sdll + inline_dl)) { |
| pr_err("XCOPY parameter truncation: data length %u too small " |
| "for tdll: %hu sdll: %u inline_dl: %u\n", |
| se_cmd->data_length, tdll, sdll, inline_dl); |
| ret = TCM_PARAMETER_LIST_LENGTH_ERROR; |
| goto out; |
| } |
| |
| pr_debug("Processing XCOPY with list_id: 0x%02x list_id_usage: 0x%02x" |
| " tdll: %hu sdll: %u inline_dl: %u\n", list_id, list_id_usage, |
| tdll, sdll, inline_dl); |
| |
| /* |
| * skip over the target descriptors until segment descriptors |
| * have been passed - CSCD ids are needed to determine src and dest. |
| */ |
| seg_desc = &p[16] + tdll; |
| |
| rc = target_xcopy_parse_segment_descriptors(se_cmd, xop, seg_desc, |
| sdll, &ret); |
| if (rc <= 0) |
| goto out; |
| |
| pr_debug("XCOPY: Processed %d segment descriptors, length: %u\n", rc, |
| rc * XCOPY_SEGMENT_DESC_LEN); |
| |
| rc = target_xcopy_parse_target_descriptors(se_cmd, xop, &p[16], tdll, &ret); |
| if (rc <= 0) |
| goto out; |
| |
| if (xop->src_dev->dev_attrib.block_size != |
| xop->dst_dev->dev_attrib.block_size) { |
| pr_err("XCOPY: Non matching src_dev block_size: %u + dst_dev" |
| " block_size: %u currently unsupported\n", |
| xop->src_dev->dev_attrib.block_size, |
| xop->dst_dev->dev_attrib.block_size); |
| xcopy_pt_undepend_remotedev(xop); |
| ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
| goto out; |
| } |
| |
| pr_debug("XCOPY: Processed %d target descriptors, length: %u\n", rc, |
| rc * XCOPY_TARGET_DESC_LEN); |
| transport_kunmap_data_sg(se_cmd); |
| return TCM_NO_SENSE; |
| |
| out: |
| if (p) |
| transport_kunmap_data_sg(se_cmd); |
| return ret; |
| } |
| |
| sense_reason_t target_do_xcopy(struct se_cmd *se_cmd) |
| { |
| struct se_device *dev = se_cmd->se_dev; |
| struct xcopy_op *xop; |
| unsigned int sa; |
| |
| if (!dev->dev_attrib.emulate_3pc) { |
| pr_err("EXTENDED_COPY operation explicitly disabled\n"); |
| return TCM_UNSUPPORTED_SCSI_OPCODE; |
| } |
| |
| sa = se_cmd->t_task_cdb[1] & 0x1f; |
| if (sa != 0x00) { |
| pr_err("EXTENDED_COPY(LID4) not supported\n"); |
| return TCM_UNSUPPORTED_SCSI_OPCODE; |
| } |
| |
| if (se_cmd->data_length == 0) { |
| target_complete_cmd(se_cmd, SAM_STAT_GOOD); |
| return TCM_NO_SENSE; |
| } |
| if (se_cmd->data_length < XCOPY_HDR_LEN) { |
| pr_err("XCOPY parameter truncation: length %u < hdr_len %u\n", |
| se_cmd->data_length, XCOPY_HDR_LEN); |
| return TCM_PARAMETER_LIST_LENGTH_ERROR; |
| } |
| |
| xop = kzalloc(sizeof(struct xcopy_op), GFP_KERNEL); |
| if (!xop) |
| goto err; |
| xop->xop_se_cmd = se_cmd; |
| INIT_WORK(&xop->xop_work, target_xcopy_do_work); |
| if (WARN_ON_ONCE(!queue_work(xcopy_wq, &xop->xop_work))) |
| goto free; |
| return TCM_NO_SENSE; |
| |
| free: |
| kfree(xop); |
| |
| err: |
| return TCM_OUT_OF_RESOURCES; |
| } |
| |
| static sense_reason_t target_rcr_operating_parameters(struct se_cmd *se_cmd) |
| { |
| unsigned char *p; |
| |
| p = transport_kmap_data_sg(se_cmd); |
| if (!p) { |
| pr_err("transport_kmap_data_sg failed in" |
| " target_rcr_operating_parameters\n"); |
| return TCM_OUT_OF_RESOURCES; |
| } |
| |
| if (se_cmd->data_length < 54) { |
| pr_err("Receive Copy Results Op Parameters length" |
| " too small: %u\n", se_cmd->data_length); |
| transport_kunmap_data_sg(se_cmd); |
| return TCM_INVALID_CDB_FIELD; |
| } |
| /* |
| * Set SNLID=1 (Supports no List ID) |
| */ |
| p[4] = 0x1; |
| /* |
| * MAXIMUM TARGET DESCRIPTOR COUNT |
| */ |
| put_unaligned_be16(RCR_OP_MAX_TARGET_DESC_COUNT, &p[8]); |
| /* |
| * MAXIMUM SEGMENT DESCRIPTOR COUNT |
| */ |
| put_unaligned_be16(RCR_OP_MAX_SG_DESC_COUNT, &p[10]); |
| /* |
| * MAXIMUM DESCRIPTOR LIST LENGTH |
| */ |
| put_unaligned_be32(RCR_OP_MAX_DESC_LIST_LEN, &p[12]); |
| /* |
| * MAXIMUM SEGMENT LENGTH |
| */ |
| put_unaligned_be32(RCR_OP_MAX_SEGMENT_LEN, &p[16]); |
| /* |
| * MAXIMUM INLINE DATA LENGTH for SA 0x04 (NOT SUPPORTED) |
| */ |
| put_unaligned_be32(0x0, &p[20]); |
| /* |
| * HELD DATA LIMIT |
| */ |
| put_unaligned_be32(0x0, &p[24]); |
| /* |
| * MAXIMUM STREAM DEVICE TRANSFER SIZE |
| */ |
| put_unaligned_be32(0x0, &p[28]); |
| /* |
| * TOTAL CONCURRENT COPIES |
| */ |
| put_unaligned_be16(RCR_OP_TOTAL_CONCURR_COPIES, &p[34]); |
| /* |
| * MAXIMUM CONCURRENT COPIES |
| */ |
| p[36] = RCR_OP_MAX_CONCURR_COPIES; |
| /* |
| * DATA SEGMENT GRANULARITY (log 2) |
| */ |
| p[37] = RCR_OP_DATA_SEG_GRAN_LOG2; |
| /* |
| * INLINE DATA GRANULARITY log 2) |
| */ |
| p[38] = RCR_OP_INLINE_DATA_GRAN_LOG2; |
| /* |
| * HELD DATA GRANULARITY |
| */ |
| p[39] = RCR_OP_HELD_DATA_GRAN_LOG2; |
| /* |
| * IMPLEMENTED DESCRIPTOR LIST LENGTH |
| */ |
| p[43] = 0x2; |
| /* |
| * List of implemented descriptor type codes (ordered) |
| */ |
| p[44] = 0x02; /* Copy Block to Block device */ |
| p[45] = 0xe4; /* Identification descriptor target descriptor */ |
| |
| /* |
| * AVAILABLE DATA (n-3) |
| */ |
| put_unaligned_be32(42, &p[0]); |
| |
| transport_kunmap_data_sg(se_cmd); |
| target_complete_cmd(se_cmd, GOOD); |
| |
| return TCM_NO_SENSE; |
| } |
| |
| sense_reason_t target_do_receive_copy_results(struct se_cmd *se_cmd) |
| { |
| unsigned char *cdb = &se_cmd->t_task_cdb[0]; |
| int sa = (cdb[1] & 0x1f), list_id = cdb[2]; |
| sense_reason_t rc = TCM_NO_SENSE; |
| |
| pr_debug("Entering target_do_receive_copy_results: SA: 0x%02x, List ID:" |
| " 0x%02x, AL: %u\n", sa, list_id, se_cmd->data_length); |
| |
| if (list_id != 0) { |
| pr_err("Receive Copy Results with non zero list identifier" |
| " not supported\n"); |
| return TCM_INVALID_CDB_FIELD; |
| } |
| |
| switch (sa) { |
| case RCR_SA_OPERATING_PARAMETERS: |
| rc = target_rcr_operating_parameters(se_cmd); |
| break; |
| case RCR_SA_COPY_STATUS: |
| case RCR_SA_RECEIVE_DATA: |
| case RCR_SA_FAILED_SEGMENT_DETAILS: |
| default: |
| pr_err("Unsupported SA for receive copy results: 0x%02x\n", sa); |
| return TCM_INVALID_CDB_FIELD; |
| } |
| |
| return rc; |
| } |