/******************************************************************************* * 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 * * 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 #include #include #include #include #include #include #include #include #include #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; } /** * target_xcopy_locate_se_dev_e4_iter - compare XCOPY NAA device identifiers * * @se_dev: device being considered for match * @dev_wwn: XCOPY requested NAA dev_wwn * @return: 1 on match, 0 on no-match */ static int target_xcopy_locate_se_dev_e4_iter(struct se_device *se_dev, const unsigned char *dev_wwn) { unsigned char tmp_dev_wwn[XCOPY_NAA_IEEE_REGEX_LEN]; int rc; if (!se_dev->dev_attrib.emulate_3pc) { pr_debug("XCOPY: emulate_3pc disabled on se_dev %p\n", se_dev); 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], dev_wwn, XCOPY_NAA_IEEE_REGEX_LEN); if (rc != 0) { pr_debug("XCOPY: skip non-matching: %*ph\n", XCOPY_NAA_IEEE_REGEX_LEN, tmp_dev_wwn); return 0; } pr_debug("XCOPY 0xe4: located se_dev: %p\n", se_dev); return 1; } static int target_xcopy_locate_se_dev_e4(struct se_session *sess, const unsigned char *dev_wwn, struct se_device **_found_dev, struct percpu_ref **_found_lun_ref) { struct se_dev_entry *deve; struct se_node_acl *nacl; struct se_lun *this_lun = NULL; struct se_device *found_dev = NULL; /* cmd with NULL sess indicates no associated $FABRIC_MOD */ if (!sess) goto err_out; pr_debug("XCOPY 0xe4: searching for: %*ph\n", XCOPY_NAA_IEEE_REGEX_LEN, dev_wwn); nacl = sess->se_node_acl; rcu_read_lock(); hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) { struct se_device *this_dev; int rc; this_lun = rcu_dereference(deve->se_lun); this_dev = rcu_dereference_raw(this_lun->lun_se_dev); rc = target_xcopy_locate_se_dev_e4_iter(this_dev, dev_wwn); if (rc) { if (percpu_ref_tryget_live(&this_lun->lun_ref)) found_dev = this_dev; break; } } rcu_read_unlock(); if (found_dev == NULL) goto err_out; pr_debug("lun_ref held for se_dev: %p se_dev->se_dev_group: %p\n", found_dev, &found_dev->dev_group); *_found_dev = found_dev; *_found_lun_ref = &this_lun->lun_ref; return 0; err_out: 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(se_cmd->se_sess, xop->dst_tid_wwn, &xop->dst_dev, &xop->remote_lun_ref); break; case XCOL_DEST_RECV_OP: rc = target_xcopy_locate_se_dev_e4(se_cmd->se_sess, xop->src_tid_wwn, &xop->src_dev, &xop->remote_lun_ref); 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 xcopy_op *xcopy_op; 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 char *xcopy_pt_get_fabric_name(void) { return "xcopy-pt"; } static int xcopy_pt_get_cmd_state(struct se_cmd *se_cmd) { return 0; } static void xcopy_pt_undepend_remotedev(struct xcopy_op *xop) { if (xop->op_origin == XCOL_SOURCE_RECV_OP) pr_debug("putting dst lun_ref for %p\n", xop->dst_dev); else pr_debug("putting src lun_ref for %p\n", xop->src_dev); percpu_ref_put(xop->remote_lun_ref); } 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_write_pending_status(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 = { .get_fabric_name = xcopy_pt_get_fabric_name, .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, .write_pending_status = xcopy_pt_write_pending_status, .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); xpt_cmd->xcopy_op = xop; 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; }