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1047 lines
28 KiB
1047 lines
28 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/******************************************************************************* |
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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 <[email protected]> |
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* |
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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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|
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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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|
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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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|
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static struct workqueue_struct *xcopy_wq = NULL; |
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|
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static sense_reason_t target_parse_xcopy_cmd(struct xcopy_op *xop); |
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|
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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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|
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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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|
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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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|
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/** |
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* target_xcopy_locate_se_dev_e4_iter - compare XCOPY NAA device identifiers |
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* |
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* @se_dev: device being considered for match |
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* @dev_wwn: XCOPY requested NAA dev_wwn |
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* @return: 1 on match, 0 on no-match |
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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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const unsigned char *dev_wwn) |
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{ |
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unsigned char tmp_dev_wwn[XCOPY_NAA_IEEE_REGEX_LEN]; |
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int rc; |
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|
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if (!se_dev->dev_attrib.emulate_3pc) { |
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pr_debug("XCOPY: emulate_3pc disabled on se_dev %p\n", se_dev); |
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return 0; |
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} |
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|
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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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|
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rc = memcmp(&tmp_dev_wwn[0], dev_wwn, XCOPY_NAA_IEEE_REGEX_LEN); |
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if (rc != 0) { |
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pr_debug("XCOPY: skip non-matching: %*ph\n", |
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XCOPY_NAA_IEEE_REGEX_LEN, tmp_dev_wwn); |
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return 0; |
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} |
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pr_debug("XCOPY 0xe4: located se_dev: %p\n", se_dev); |
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|
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return 1; |
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} |
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|
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static int target_xcopy_locate_se_dev_e4(struct se_session *sess, |
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const unsigned char *dev_wwn, |
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struct se_device **_found_dev, |
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struct percpu_ref **_found_lun_ref) |
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{ |
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struct se_dev_entry *deve; |
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struct se_node_acl *nacl; |
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struct se_lun *this_lun = NULL; |
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struct se_device *found_dev = NULL; |
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|
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/* cmd with NULL sess indicates no associated $FABRIC_MOD */ |
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if (!sess) |
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goto err_out; |
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pr_debug("XCOPY 0xe4: searching for: %*ph\n", |
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XCOPY_NAA_IEEE_REGEX_LEN, dev_wwn); |
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|
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nacl = sess->se_node_acl; |
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rcu_read_lock(); |
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hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) { |
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struct se_device *this_dev; |
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int rc; |
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|
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this_lun = rcu_dereference(deve->se_lun); |
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this_dev = rcu_dereference_raw(this_lun->lun_se_dev); |
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|
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rc = target_xcopy_locate_se_dev_e4_iter(this_dev, dev_wwn); |
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if (rc) { |
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if (percpu_ref_tryget_live(&this_lun->lun_ref)) |
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found_dev = this_dev; |
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break; |
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} |
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} |
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rcu_read_unlock(); |
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if (found_dev == NULL) |
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goto err_out; |
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|
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pr_debug("lun_ref held for se_dev: %p se_dev->se_dev_group: %p\n", |
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found_dev, &found_dev->dev_group); |
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*_found_dev = found_dev; |
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*_found_lun_ref = &this_lun->lun_ref; |
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return 0; |
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err_out: |
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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 != XCOPY_NAA_IEEE_REGEX_LEN) { |
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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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|
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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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|
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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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|
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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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|
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return 0; |
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} |
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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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|
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*sense_ret = TCM_INVALID_PARAMETER_LIST; |
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|
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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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|
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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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|
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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(se_cmd->se_sess, |
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xop->dst_tid_wwn, |
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&xop->dst_dev, |
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&xop->remote_lun_ref); |
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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(se_cmd->se_sess, |
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xop->src_tid_wwn, |
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&xop->src_dev, |
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&xop->remote_lun_ref); |
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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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|
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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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|
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return cscd_index; |
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|
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out: |
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return -EINVAL; |
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} |
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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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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; |
|
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" |
|
" multiple of %d\n", XCOPY_SEGMENT_DESC_LEN); |
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*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); |
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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; |
|
} |
|
|
|
while (start < sdll) { |
|
/* |
|
* Check segment descriptor type code for block -> block |
|
*/ |
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switch (desc[0]) { |
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case 0x02: |
|
rc = target_xcopy_parse_segdesc_02(se_cmd, xop, desc); |
|
if (rc < 0) |
|
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; |
|
default: |
|
pr_err("XCOPY unsupported segment descriptor" |
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"type: 0x%02x\n", desc[0]); |
|
*sense_ret = TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE; |
|
goto out; |
|
} |
|
} |
|
|
|
return ret; |
|
|
|
out: |
|
return -EINVAL; |
|
} |
|
|
|
/* |
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* Start xcopy_pt ops |
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*/ |
|
|
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struct xcopy_pt_cmd { |
|
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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struct se_portal_group xcopy_pt_tpg; |
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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) |
|
{ |
|
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); |
|
|
|
/* xpt_cmd is on the stack, nothing to free here */ |
|
pr_debug("xpt_cmd done: %p\n", 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", |
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.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.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) |
|
goto destroy_wq; |
|
|
|
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; |
|
|
|
destroy_wq: |
|
destroy_workqueue(xcopy_wq); |
|
xcopy_wq = NULL; |
|
return ret; |
|
} |
|
|
|
void target_xcopy_release_pt(void) |
|
{ |
|
if (xcopy_wq) { |
|
destroy_workqueue(xcopy_wq); |
|
transport_uninit_session(&xcopy_pt_sess); |
|
} |
|
} |
|
|
|
/* |
|
* 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. |
|
* |
|
* 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) |
|
{ |
|
struct se_cmd *cmd = &xpt_cmd->se_cmd; |
|
|
|
/* |
|
* 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; |
|
|
|
if (target_cmd_init_cdb(cmd, cdb)) |
|
return -EINVAL; |
|
|
|
cmd->tag = 0; |
|
if (target_cmd_parse_cdb(cmd)) |
|
return -EINVAL; |
|
|
|
if (transport_generic_map_mem_to_cmd(cmd, xop->xop_data_sg, |
|
xop->xop_data_nents, NULL, 0)) |
|
return -EINVAL; |
|
|
|
pr_debug("Setup PASSTHROUGH_NOALLOC t_data_sg: %p t_data_nents:" |
|
" %u\n", cmd->t_data_sg, cmd->t_data_nents); |
|
|
|
return 0; |
|
} |
|
|
|
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 = &xpt_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); |
|
|
|
memset(&xpt_cmd, 0, sizeof(xpt_cmd)); |
|
init_completion(&xpt_cmd.xpt_passthrough_sem); |
|
|
|
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], 0); |
|
|
|
rc = target_xcopy_setup_pt_cmd(&xpt_cmd, xop, src_dev, &cdb[0], |
|
remote_port); |
|
if (rc < 0) { |
|
ec_cmd->scsi_status = se_cmd->scsi_status; |
|
goto out; |
|
} |
|
|
|
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 = se_cmd->scsi_status; |
|
out: |
|
transport_generic_free_cmd(se_cmd, 0); |
|
return rc; |
|
} |
|
|
|
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 = &xpt_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); |
|
|
|
memset(&xpt_cmd, 0, sizeof(xpt_cmd)); |
|
init_completion(&xpt_cmd.xpt_passthrough_sem); |
|
|
|
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], 0); |
|
|
|
rc = target_xcopy_setup_pt_cmd(&xpt_cmd, xop, dst_dev, &cdb[0], |
|
remote_port); |
|
if (rc < 0) { |
|
ec_cmd->scsi_status = se_cmd->scsi_status; |
|
goto out; |
|
} |
|
|
|
rc = target_xcopy_issue_pt_cmd(&xpt_cmd); |
|
if (rc < 0) |
|
ec_cmd->scsi_status = se_cmd->scsi_status; |
|
out: |
|
transport_generic_free_cmd(se_cmd, 0); |
|
return rc; |
|
} |
|
|
|
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, 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) { |
|
unsigned short cur_nolb = min(nolb, max_nolb); |
|
u32 cur_bytes = cur_nolb * src_dev->dev_attrib.block_size; |
|
|
|
if (cur_bytes != xop->xop_data_bytes) { |
|
/* |
|
* (Re)allocate a buffer large enough to hold the XCOPY |
|
* I/O size, which can be reused each read / write loop. |
|
*/ |
|
target_free_sgl(xop->xop_data_sg, xop->xop_data_nents); |
|
rc = target_alloc_sgl(&xop->xop_data_sg, |
|
&xop->xop_data_nents, |
|
cur_bytes, |
|
false, false); |
|
if (rc < 0) |
|
goto out; |
|
xop->xop_data_bytes = cur_bytes; |
|
} |
|
|
|
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) |
|
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; |
|
} |
|
|
|
xcopy_pt_undepend_remotedev(xop); |
|
target_free_sgl(xop->xop_data_sg, xop->xop_data_nents); |
|
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); |
|
target_free_sgl(xop->xop_data_sg, xop->xop_data_nents); |
|
|
|
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; |
|
}
|
|
|