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be71530aa9
The target_xcopy_setup_pt_port() and target_xcopy_init_pt_lun() functions obfuscate what is really going on. Hence inline these two functions. This patch does not change any functionality. Cc: Mike Christie <mchristi@redhat.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Hannes Reinecke <hare@suse.com> Cc: Nicholas Bellinger <nab@linux-iscsi.org> Signed-off-by: Bart Van Assche <bvanassche@acm.org> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
1090 lines
29 KiB
C
1090 lines
29 KiB
C
/*******************************************************************************
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* Filename: target_core_xcopy.c
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*
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* This file contains support for SPC-4 Extended-Copy offload with generic
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* TCM backends.
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*
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* Copyright (c) 2011-2013 Datera, Inc. All rights reserved.
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*
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* Author:
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* Nicholas A. Bellinger <nab@daterainc.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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******************************************************************************/
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/list.h>
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#include <linux/configfs.h>
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#include <linux/ratelimit.h>
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#include <scsi/scsi_proto.h>
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#include <asm/unaligned.h>
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#include <target/target_core_base.h>
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#include <target/target_core_backend.h>
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#include <target/target_core_fabric.h>
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#include "target_core_internal.h"
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#include "target_core_pr.h"
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#include "target_core_ua.h"
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#include "target_core_xcopy.h"
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static struct workqueue_struct *xcopy_wq = NULL;
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static sense_reason_t target_parse_xcopy_cmd(struct xcopy_op *xop);
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static int target_xcopy_gen_naa_ieee(struct se_device *dev, unsigned char *buf)
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{
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int off = 0;
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buf[off++] = (0x6 << 4);
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buf[off++] = 0x01;
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buf[off++] = 0x40;
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buf[off] = (0x5 << 4);
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spc_parse_naa_6h_vendor_specific(dev, &buf[off]);
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return 0;
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}
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struct xcopy_dev_search_info {
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const unsigned char *dev_wwn;
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struct se_device *found_dev;
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};
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static int target_xcopy_locate_se_dev_e4_iter(struct se_device *se_dev,
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void *data)
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{
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struct xcopy_dev_search_info *info = data;
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unsigned char tmp_dev_wwn[XCOPY_NAA_IEEE_REGEX_LEN];
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int rc;
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if (!se_dev->dev_attrib.emulate_3pc)
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return 0;
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memset(&tmp_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN);
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target_xcopy_gen_naa_ieee(se_dev, &tmp_dev_wwn[0]);
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rc = memcmp(&tmp_dev_wwn[0], info->dev_wwn, XCOPY_NAA_IEEE_REGEX_LEN);
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if (rc != 0)
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return 0;
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info->found_dev = se_dev;
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pr_debug("XCOPY 0xe4: located se_dev: %p\n", se_dev);
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rc = target_depend_item(&se_dev->dev_group.cg_item);
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if (rc != 0) {
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pr_err("configfs_depend_item attempt failed: %d for se_dev: %p\n",
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rc, se_dev);
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return rc;
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}
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pr_debug("Called configfs_depend_item for se_dev: %p se_dev->se_dev_group: %p\n",
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se_dev, &se_dev->dev_group);
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return 1;
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}
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static int target_xcopy_locate_se_dev_e4(const unsigned char *dev_wwn,
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struct se_device **found_dev)
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{
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struct xcopy_dev_search_info info;
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int ret;
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memset(&info, 0, sizeof(info));
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info.dev_wwn = dev_wwn;
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ret = target_for_each_device(target_xcopy_locate_se_dev_e4_iter, &info);
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if (ret == 1) {
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*found_dev = info.found_dev;
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return 0;
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} else {
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pr_debug_ratelimited("Unable to locate 0xe4 descriptor for EXTENDED_COPY\n");
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return -EINVAL;
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}
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}
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static int target_xcopy_parse_tiddesc_e4(struct se_cmd *se_cmd, struct xcopy_op *xop,
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unsigned char *p, unsigned short cscd_index)
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{
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unsigned char *desc = p;
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unsigned short ript;
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u8 desig_len;
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/*
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* Extract RELATIVE INITIATOR PORT IDENTIFIER
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*/
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ript = get_unaligned_be16(&desc[2]);
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pr_debug("XCOPY 0xe4: RELATIVE INITIATOR PORT IDENTIFIER: %hu\n", ript);
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/*
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* Check for supported code set, association, and designator type
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*/
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if ((desc[4] & 0x0f) != 0x1) {
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pr_err("XCOPY 0xe4: code set of non binary type not supported\n");
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return -EINVAL;
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}
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if ((desc[5] & 0x30) != 0x00) {
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pr_err("XCOPY 0xe4: association other than LUN not supported\n");
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return -EINVAL;
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}
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if ((desc[5] & 0x0f) != 0x3) {
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pr_err("XCOPY 0xe4: designator type unsupported: 0x%02x\n",
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(desc[5] & 0x0f));
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return -EINVAL;
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}
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/*
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* Check for matching 16 byte length for NAA IEEE Registered Extended
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* Assigned designator
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*/
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desig_len = desc[7];
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if (desig_len != 16) {
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pr_err("XCOPY 0xe4: invalid desig_len: %d\n", (int)desig_len);
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return -EINVAL;
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}
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pr_debug("XCOPY 0xe4: desig_len: %d\n", (int)desig_len);
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/*
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* Check for NAA IEEE Registered Extended Assigned header..
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*/
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if ((desc[8] & 0xf0) != 0x60) {
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pr_err("XCOPY 0xe4: Unsupported DESIGNATOR TYPE: 0x%02x\n",
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(desc[8] & 0xf0));
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return -EINVAL;
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}
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if (cscd_index != xop->stdi && cscd_index != xop->dtdi) {
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pr_debug("XCOPY 0xe4: ignoring CSCD entry %d - neither src nor "
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"dest\n", cscd_index);
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return 0;
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}
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if (cscd_index == xop->stdi) {
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memcpy(&xop->src_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN);
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/*
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* Determine if the source designator matches the local device
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*/
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if (!memcmp(&xop->local_dev_wwn[0], &xop->src_tid_wwn[0],
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XCOPY_NAA_IEEE_REGEX_LEN)) {
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xop->op_origin = XCOL_SOURCE_RECV_OP;
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xop->src_dev = se_cmd->se_dev;
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pr_debug("XCOPY 0xe4: Set xop->src_dev %p from source"
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" received xop\n", xop->src_dev);
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}
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}
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if (cscd_index == xop->dtdi) {
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memcpy(&xop->dst_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN);
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/*
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* Determine if the destination designator matches the local
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* device. If @cscd_index corresponds to both source (stdi) and
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* destination (dtdi), or dtdi comes after stdi, then
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* XCOL_DEST_RECV_OP wins.
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*/
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if (!memcmp(&xop->local_dev_wwn[0], &xop->dst_tid_wwn[0],
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XCOPY_NAA_IEEE_REGEX_LEN)) {
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xop->op_origin = XCOL_DEST_RECV_OP;
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xop->dst_dev = se_cmd->se_dev;
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pr_debug("XCOPY 0xe4: Set xop->dst_dev: %p from destination"
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" received xop\n", xop->dst_dev);
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}
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}
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return 0;
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}
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static int target_xcopy_parse_target_descriptors(struct se_cmd *se_cmd,
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struct xcopy_op *xop, unsigned char *p,
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unsigned short tdll, sense_reason_t *sense_ret)
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{
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struct se_device *local_dev = se_cmd->se_dev;
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unsigned char *desc = p;
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int offset = tdll % XCOPY_TARGET_DESC_LEN, rc;
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unsigned short cscd_index = 0;
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unsigned short start = 0;
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*sense_ret = TCM_INVALID_PARAMETER_LIST;
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if (offset != 0) {
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pr_err("XCOPY target descriptor list length is not"
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" multiple of %d\n", XCOPY_TARGET_DESC_LEN);
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*sense_ret = TCM_UNSUPPORTED_TARGET_DESC_TYPE_CODE;
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return -EINVAL;
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}
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if (tdll > RCR_OP_MAX_TARGET_DESC_COUNT * XCOPY_TARGET_DESC_LEN) {
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pr_err("XCOPY target descriptor supports a maximum"
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" two src/dest descriptors, tdll: %hu too large..\n", tdll);
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/* spc4r37 6.4.3.4 CSCD DESCRIPTOR LIST LENGTH field */
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*sense_ret = TCM_TOO_MANY_TARGET_DESCS;
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return -EINVAL;
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}
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/*
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* Generate an IEEE Registered Extended designator based upon the
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* se_device the XCOPY was received upon..
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*/
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memset(&xop->local_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN);
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target_xcopy_gen_naa_ieee(local_dev, &xop->local_dev_wwn[0]);
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while (start < tdll) {
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/*
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* Check target descriptor identification with 0xE4 type, and
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* compare the current index with the CSCD descriptor IDs in
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* the segment descriptor. Use VPD 0x83 WWPN matching ..
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*/
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switch (desc[0]) {
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case 0xe4:
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rc = target_xcopy_parse_tiddesc_e4(se_cmd, xop,
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&desc[0], cscd_index);
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if (rc != 0)
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goto out;
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start += XCOPY_TARGET_DESC_LEN;
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desc += XCOPY_TARGET_DESC_LEN;
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cscd_index++;
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break;
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default:
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pr_err("XCOPY unsupported descriptor type code:"
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" 0x%02x\n", desc[0]);
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*sense_ret = TCM_UNSUPPORTED_TARGET_DESC_TYPE_CODE;
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goto out;
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}
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}
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switch (xop->op_origin) {
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case XCOL_SOURCE_RECV_OP:
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rc = target_xcopy_locate_se_dev_e4(xop->dst_tid_wwn,
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&xop->dst_dev);
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break;
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case XCOL_DEST_RECV_OP:
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rc = target_xcopy_locate_se_dev_e4(xop->src_tid_wwn,
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&xop->src_dev);
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break;
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default:
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pr_err("XCOPY CSCD descriptor IDs not found in CSCD list - "
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"stdi: %hu dtdi: %hu\n", xop->stdi, xop->dtdi);
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rc = -EINVAL;
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break;
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}
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/*
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* If a matching IEEE NAA 0x83 descriptor for the requested device
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* is not located on this node, return COPY_ABORTED with ASQ/ASQC
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* 0x0d/0x02 - COPY_TARGET_DEVICE_NOT_REACHABLE to request the
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* initiator to fall back to normal copy method.
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*/
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if (rc < 0) {
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*sense_ret = TCM_COPY_TARGET_DEVICE_NOT_REACHABLE;
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goto out;
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}
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pr_debug("XCOPY TGT desc: Source dev: %p NAA IEEE WWN: 0x%16phN\n",
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xop->src_dev, &xop->src_tid_wwn[0]);
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pr_debug("XCOPY TGT desc: Dest dev: %p NAA IEEE WWN: 0x%16phN\n",
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xop->dst_dev, &xop->dst_tid_wwn[0]);
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return cscd_index;
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out:
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return -EINVAL;
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}
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static int target_xcopy_parse_segdesc_02(struct se_cmd *se_cmd, struct xcopy_op *xop,
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unsigned char *p)
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{
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unsigned char *desc = p;
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int dc = (desc[1] & 0x02);
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unsigned short desc_len;
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desc_len = get_unaligned_be16(&desc[2]);
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if (desc_len != 0x18) {
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pr_err("XCOPY segment desc 0x02: Illegal desc_len:"
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" %hu\n", desc_len);
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return -EINVAL;
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}
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xop->stdi = get_unaligned_be16(&desc[4]);
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xop->dtdi = get_unaligned_be16(&desc[6]);
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if (xop->stdi > XCOPY_CSCD_DESC_ID_LIST_OFF_MAX ||
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xop->dtdi > XCOPY_CSCD_DESC_ID_LIST_OFF_MAX) {
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pr_err("XCOPY segment desc 0x02: unsupported CSCD ID > 0x%x; stdi: %hu dtdi: %hu\n",
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XCOPY_CSCD_DESC_ID_LIST_OFF_MAX, xop->stdi, xop->dtdi);
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return -EINVAL;
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}
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pr_debug("XCOPY seg desc 0x02: desc_len: %hu stdi: %hu dtdi: %hu, DC: %d\n",
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desc_len, xop->stdi, xop->dtdi, dc);
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xop->nolb = get_unaligned_be16(&desc[10]);
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xop->src_lba = get_unaligned_be64(&desc[12]);
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xop->dst_lba = get_unaligned_be64(&desc[20]);
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pr_debug("XCOPY seg desc 0x02: nolb: %hu src_lba: %llu dst_lba: %llu\n",
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xop->nolb, (unsigned long long)xop->src_lba,
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(unsigned long long)xop->dst_lba);
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if (dc != 0) {
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xop->dbl = get_unaligned_be24(&desc[29]);
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pr_debug("XCOPY seg desc 0x02: DC=1 w/ dbl: %u\n", xop->dbl);
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}
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return 0;
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}
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static int target_xcopy_parse_segment_descriptors(struct se_cmd *se_cmd,
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struct xcopy_op *xop, unsigned char *p,
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unsigned int sdll, sense_reason_t *sense_ret)
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{
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unsigned char *desc = p;
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unsigned int start = 0;
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int offset = sdll % XCOPY_SEGMENT_DESC_LEN, rc, ret = 0;
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*sense_ret = TCM_INVALID_PARAMETER_LIST;
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if (offset != 0) {
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pr_err("XCOPY segment descriptor list length is not"
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" multiple of %d\n", XCOPY_SEGMENT_DESC_LEN);
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*sense_ret = TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE;
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return -EINVAL;
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}
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if (sdll > RCR_OP_MAX_SG_DESC_COUNT * XCOPY_SEGMENT_DESC_LEN) {
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pr_err("XCOPY supports %u segment descriptor(s), sdll: %u too"
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" large..\n", RCR_OP_MAX_SG_DESC_COUNT, sdll);
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/* spc4r37 6.4.3.5 SEGMENT DESCRIPTOR LIST LENGTH field */
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*sense_ret = TCM_TOO_MANY_SEGMENT_DESCS;
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return -EINVAL;
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}
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while (start < sdll) {
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/*
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* Check segment descriptor type code for block -> block
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*/
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switch (desc[0]) {
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case 0x02:
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rc = target_xcopy_parse_segdesc_02(se_cmd, xop, desc);
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if (rc < 0)
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goto out;
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ret++;
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start += XCOPY_SEGMENT_DESC_LEN;
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desc += XCOPY_SEGMENT_DESC_LEN;
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break;
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default:
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pr_err("XCOPY unsupported segment descriptor"
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"type: 0x%02x\n", desc[0]);
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*sense_ret = TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE;
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goto out;
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}
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}
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return ret;
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out:
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return -EINVAL;
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}
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/*
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* Start xcopy_pt ops
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*/
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struct xcopy_pt_cmd {
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struct se_cmd se_cmd;
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struct completion xpt_passthrough_sem;
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unsigned char sense_buffer[TRANSPORT_SENSE_BUFFER];
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};
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struct se_portal_group xcopy_pt_tpg;
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static struct se_session xcopy_pt_sess;
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static struct se_node_acl xcopy_pt_nacl;
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static int xcopy_pt_get_cmd_state(struct se_cmd *se_cmd)
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{
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return 0;
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}
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static void xcopy_pt_undepend_remotedev(struct xcopy_op *xop)
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{
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struct se_device *remote_dev;
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if (xop->op_origin == XCOL_SOURCE_RECV_OP)
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remote_dev = xop->dst_dev;
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else
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remote_dev = xop->src_dev;
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pr_debug("Calling configfs_undepend_item for"
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" remote_dev: %p remote_dev->dev_group: %p\n",
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remote_dev, &remote_dev->dev_group.cg_item);
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target_undepend_item(&remote_dev->dev_group.cg_item);
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}
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|
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static void xcopy_pt_release_cmd(struct se_cmd *se_cmd)
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{
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struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd,
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struct xcopy_pt_cmd, se_cmd);
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kfree(xpt_cmd);
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}
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static int xcopy_pt_check_stop_free(struct se_cmd *se_cmd)
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{
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struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd,
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struct xcopy_pt_cmd, se_cmd);
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complete(&xpt_cmd->xpt_passthrough_sem);
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return 0;
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}
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static int xcopy_pt_write_pending(struct se_cmd *se_cmd)
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{
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return 0;
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}
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static int xcopy_pt_queue_data_in(struct se_cmd *se_cmd)
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{
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return 0;
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}
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|
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static int xcopy_pt_queue_status(struct se_cmd *se_cmd)
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{
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return 0;
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}
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|
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static const struct target_core_fabric_ops xcopy_pt_tfo = {
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.fabric_name = "xcopy-pt",
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.get_cmd_state = xcopy_pt_get_cmd_state,
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.release_cmd = xcopy_pt_release_cmd,
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|
.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);
|
|
}
|
|
|
|
/*
|
|
* target_xcopy_setup_pt_cmd - set up a pass-through command
|
|
* @xpt_cmd: Data structure to initialize.
|
|
* @xop: Describes the XCOPY operation received from an initiator.
|
|
* @se_dev: Backend device to associate with @xpt_cmd if
|
|
* @remote_port == true.
|
|
* @cdb: SCSI CDB to be copied into @xpt_cmd.
|
|
* @remote_port: If false, use the LUN through which the XCOPY command has
|
|
* been received. If true, use @se_dev->xcopy_lun.
|
|
* @alloc_mem: Whether or not to allocate an SGL list.
|
|
*
|
|
* Set up a SCSI command (READ or WRITE) that will be used to execute an
|
|
* XCOPY command.
|
|
*/
|
|
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.
|
|
*/
|
|
if (remote_port) {
|
|
cmd->se_lun = &se_dev->xcopy_lun;
|
|
cmd->se_dev = se_dev;
|
|
} else {
|
|
cmd->se_lun = xop->xop_se_cmd->se_lun;
|
|
cmd->se_dev = xop->xop_se_cmd->se_dev;
|
|
}
|
|
cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
|
|
|
|
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;
|
|
}
|