1489 lines
38 KiB
C
1489 lines
38 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* SCSI Block Commands (SBC) parsing and emulation.
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*
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* (c) Copyright 2002-2013 Datera, Inc.
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*
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* Nicholas A. Bellinger <nab@kernel.org>
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/ratelimit.h>
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#include <linux/crc-t10dif.h>
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#include <linux/t10-pi.h>
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#include <asm/unaligned.h>
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#include <scsi/scsi_proto.h>
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#include <scsi/scsi_tcq.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_ua.h"
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#include "target_core_alua.h"
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static sense_reason_t
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sbc_check_prot(struct se_device *, struct se_cmd *, unsigned char *, u32, bool);
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static sense_reason_t sbc_execute_unmap(struct se_cmd *cmd);
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static sense_reason_t
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sbc_emulate_readcapacity(struct se_cmd *cmd)
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{
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struct se_device *dev = cmd->se_dev;
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unsigned char *cdb = cmd->t_task_cdb;
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unsigned long long blocks_long = dev->transport->get_blocks(dev);
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unsigned char *rbuf;
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unsigned char buf[8];
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u32 blocks;
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/*
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* SBC-2 says:
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* If the PMI bit is set to zero and the LOGICAL BLOCK
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* ADDRESS field is not set to zero, the device server shall
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* terminate the command with CHECK CONDITION status with
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* the sense key set to ILLEGAL REQUEST and the additional
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* sense code set to INVALID FIELD IN CDB.
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*
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* In SBC-3, these fields are obsolete, but some SCSI
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* compliance tests actually check this, so we might as well
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* follow SBC-2.
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*/
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if (!(cdb[8] & 1) && !!(cdb[2] | cdb[3] | cdb[4] | cdb[5]))
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return TCM_INVALID_CDB_FIELD;
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if (blocks_long >= 0x00000000ffffffff)
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blocks = 0xffffffff;
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else
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blocks = (u32)blocks_long;
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put_unaligned_be32(blocks, &buf[0]);
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put_unaligned_be32(dev->dev_attrib.block_size, &buf[4]);
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rbuf = transport_kmap_data_sg(cmd);
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if (rbuf) {
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memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
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transport_kunmap_data_sg(cmd);
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}
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target_complete_cmd_with_length(cmd, SAM_STAT_GOOD, 8);
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return 0;
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}
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static sense_reason_t
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sbc_emulate_readcapacity_16(struct se_cmd *cmd)
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{
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struct se_device *dev = cmd->se_dev;
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struct se_session *sess = cmd->se_sess;
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int pi_prot_type = dev->dev_attrib.pi_prot_type;
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unsigned char *rbuf;
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unsigned char buf[32];
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unsigned long long blocks = dev->transport->get_blocks(dev);
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memset(buf, 0, sizeof(buf));
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put_unaligned_be64(blocks, &buf[0]);
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put_unaligned_be32(dev->dev_attrib.block_size, &buf[8]);
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/*
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* Set P_TYPE and PROT_EN bits for DIF support
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*/
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if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) {
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/*
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* Only override a device's pi_prot_type if no T10-PI is
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* available, and sess_prot_type has been explicitly enabled.
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*/
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if (!pi_prot_type)
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pi_prot_type = sess->sess_prot_type;
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if (pi_prot_type)
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buf[12] = (pi_prot_type - 1) << 1 | 0x1;
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}
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if (dev->transport->get_lbppbe)
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buf[13] = dev->transport->get_lbppbe(dev) & 0x0f;
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if (dev->transport->get_alignment_offset_lbas) {
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u16 lalba = dev->transport->get_alignment_offset_lbas(dev);
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put_unaligned_be16(lalba, &buf[14]);
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}
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/*
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* Set Thin Provisioning Enable bit following sbc3r22 in section
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* READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled.
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*/
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if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws) {
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buf[14] |= 0x80;
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/*
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* LBPRZ signifies that zeroes will be read back from an LBA after
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* an UNMAP or WRITE SAME w/ unmap bit (sbc3r36 5.16.2)
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*/
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if (dev->dev_attrib.unmap_zeroes_data)
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buf[14] |= 0x40;
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}
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rbuf = transport_kmap_data_sg(cmd);
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if (rbuf) {
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memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
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transport_kunmap_data_sg(cmd);
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}
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target_complete_cmd_with_length(cmd, SAM_STAT_GOOD, 32);
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return 0;
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}
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static sense_reason_t
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sbc_emulate_startstop(struct se_cmd *cmd)
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{
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unsigned char *cdb = cmd->t_task_cdb;
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/*
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* See sbc3r36 section 5.25
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* Immediate bit should be set since there is nothing to complete
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* POWER CONDITION MODIFIER 0h
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*/
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if (!(cdb[1] & 1) || cdb[2] || cdb[3])
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return TCM_INVALID_CDB_FIELD;
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/*
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* See sbc3r36 section 5.25
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* POWER CONDITION 0h START_VALID - process START and LOEJ
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*/
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if (cdb[4] >> 4 & 0xf)
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return TCM_INVALID_CDB_FIELD;
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/*
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* See sbc3r36 section 5.25
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* LOEJ 0h - nothing to load or unload
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* START 1h - we are ready
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*/
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if (!(cdb[4] & 1) || (cdb[4] & 2) || (cdb[4] & 4))
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return TCM_INVALID_CDB_FIELD;
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target_complete_cmd(cmd, SAM_STAT_GOOD);
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return 0;
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}
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sector_t sbc_get_write_same_sectors(struct se_cmd *cmd)
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{
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u32 num_blocks;
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if (cmd->t_task_cdb[0] == WRITE_SAME)
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num_blocks = get_unaligned_be16(&cmd->t_task_cdb[7]);
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else if (cmd->t_task_cdb[0] == WRITE_SAME_16)
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num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]);
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else /* WRITE_SAME_32 via VARIABLE_LENGTH_CMD */
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num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]);
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/*
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* Use the explicit range when non zero is supplied, otherwise calculate
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* the remaining range based on ->get_blocks() - starting LBA.
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*/
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if (num_blocks)
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return num_blocks;
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return cmd->se_dev->transport->get_blocks(cmd->se_dev) -
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cmd->t_task_lba + 1;
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}
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EXPORT_SYMBOL(sbc_get_write_same_sectors);
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static sense_reason_t
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sbc_execute_write_same_unmap(struct se_cmd *cmd)
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{
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struct sbc_ops *ops = cmd->protocol_data;
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sector_t nolb = sbc_get_write_same_sectors(cmd);
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sense_reason_t ret;
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if (nolb) {
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ret = ops->execute_unmap(cmd, cmd->t_task_lba, nolb);
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if (ret)
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return ret;
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}
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target_complete_cmd(cmd, SAM_STAT_GOOD);
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return 0;
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}
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static sense_reason_t
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sbc_emulate_noop(struct se_cmd *cmd)
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{
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target_complete_cmd(cmd, SAM_STAT_GOOD);
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return 0;
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}
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static inline u32 sbc_get_size(struct se_cmd *cmd, u32 sectors)
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{
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return cmd->se_dev->dev_attrib.block_size * sectors;
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}
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static inline u32 transport_get_sectors_6(unsigned char *cdb)
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{
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/*
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* Use 8-bit sector value. SBC-3 says:
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*
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* A TRANSFER LENGTH field set to zero specifies that 256
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* logical blocks shall be written. Any other value
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* specifies the number of logical blocks that shall be
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* written.
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*/
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return cdb[4] ? : 256;
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}
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static inline u32 transport_get_sectors_10(unsigned char *cdb)
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{
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return get_unaligned_be16(&cdb[7]);
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}
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static inline u32 transport_get_sectors_12(unsigned char *cdb)
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{
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return get_unaligned_be32(&cdb[6]);
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}
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static inline u32 transport_get_sectors_16(unsigned char *cdb)
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{
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return get_unaligned_be32(&cdb[10]);
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}
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/*
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* Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
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*/
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static inline u32 transport_get_sectors_32(unsigned char *cdb)
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{
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return get_unaligned_be32(&cdb[28]);
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}
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static inline u32 transport_lba_21(unsigned char *cdb)
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{
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return get_unaligned_be24(&cdb[1]) & 0x1fffff;
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}
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static inline u32 transport_lba_32(unsigned char *cdb)
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{
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return get_unaligned_be32(&cdb[2]);
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}
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static inline unsigned long long transport_lba_64(unsigned char *cdb)
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{
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return get_unaligned_be64(&cdb[2]);
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}
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/*
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* For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
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*/
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static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
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{
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return get_unaligned_be64(&cdb[12]);
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}
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static sense_reason_t
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sbc_setup_write_same(struct se_cmd *cmd, unsigned char *flags, struct sbc_ops *ops)
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{
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struct se_device *dev = cmd->se_dev;
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sector_t end_lba = dev->transport->get_blocks(dev) + 1;
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unsigned int sectors = sbc_get_write_same_sectors(cmd);
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sense_reason_t ret;
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if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
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pr_err("WRITE_SAME PBDATA and LBDATA"
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" bits not supported for Block Discard"
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" Emulation\n");
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return TCM_UNSUPPORTED_SCSI_OPCODE;
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}
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if (sectors > cmd->se_dev->dev_attrib.max_write_same_len) {
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pr_warn("WRITE_SAME sectors: %u exceeds max_write_same_len: %u\n",
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sectors, cmd->se_dev->dev_attrib.max_write_same_len);
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return TCM_INVALID_CDB_FIELD;
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}
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/*
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* Sanity check for LBA wrap and request past end of device.
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*/
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if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) ||
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((cmd->t_task_lba + sectors) > end_lba)) {
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pr_err("WRITE_SAME exceeds last lba %llu (lba %llu, sectors %u)\n",
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(unsigned long long)end_lba, cmd->t_task_lba, sectors);
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return TCM_ADDRESS_OUT_OF_RANGE;
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}
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/* We always have ANC_SUP == 0 so setting ANCHOR is always an error */
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if (flags[0] & 0x10) {
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pr_warn("WRITE SAME with ANCHOR not supported\n");
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return TCM_INVALID_CDB_FIELD;
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}
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/*
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* Special case for WRITE_SAME w/ UNMAP=1 that ends up getting
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* translated into block discard requests within backend code.
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*/
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if (flags[0] & 0x08) {
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if (!ops->execute_unmap)
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return TCM_UNSUPPORTED_SCSI_OPCODE;
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if (!dev->dev_attrib.emulate_tpws) {
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pr_err("Got WRITE_SAME w/ UNMAP=1, but backend device"
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" has emulate_tpws disabled\n");
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return TCM_UNSUPPORTED_SCSI_OPCODE;
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}
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cmd->execute_cmd = sbc_execute_write_same_unmap;
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return 0;
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}
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if (!ops->execute_write_same)
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return TCM_UNSUPPORTED_SCSI_OPCODE;
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ret = sbc_check_prot(dev, cmd, &cmd->t_task_cdb[0], sectors, true);
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if (ret)
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return ret;
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cmd->execute_cmd = ops->execute_write_same;
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return 0;
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}
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static sense_reason_t xdreadwrite_callback(struct se_cmd *cmd, bool success,
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int *post_ret)
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{
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unsigned char *buf, *addr;
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struct scatterlist *sg;
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unsigned int offset;
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sense_reason_t ret = TCM_NO_SENSE;
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int i, count;
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if (!success)
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return 0;
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/*
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* From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
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*
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* 1) read the specified logical block(s);
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* 2) transfer logical blocks from the data-out buffer;
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* 3) XOR the logical blocks transferred from the data-out buffer with
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* the logical blocks read, storing the resulting XOR data in a buffer;
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* 4) if the DISABLE WRITE bit is set to zero, then write the logical
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* blocks transferred from the data-out buffer; and
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* 5) transfer the resulting XOR data to the data-in buffer.
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*/
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buf = kmalloc(cmd->data_length, GFP_KERNEL);
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if (!buf) {
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pr_err("Unable to allocate xor_callback buf\n");
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return TCM_OUT_OF_RESOURCES;
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}
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/*
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* Copy the scatterlist WRITE buffer located at cmd->t_data_sg
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* into the locally allocated *buf
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*/
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sg_copy_to_buffer(cmd->t_data_sg,
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cmd->t_data_nents,
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buf,
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cmd->data_length);
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/*
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* Now perform the XOR against the BIDI read memory located at
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* cmd->t_mem_bidi_list
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*/
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offset = 0;
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for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
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addr = kmap_atomic(sg_page(sg));
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if (!addr) {
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ret = TCM_OUT_OF_RESOURCES;
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goto out;
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}
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for (i = 0; i < sg->length; i++)
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*(addr + sg->offset + i) ^= *(buf + offset + i);
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offset += sg->length;
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kunmap_atomic(addr);
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}
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out:
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kfree(buf);
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return ret;
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}
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static sense_reason_t
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sbc_execute_rw(struct se_cmd *cmd)
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{
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struct sbc_ops *ops = cmd->protocol_data;
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return ops->execute_rw(cmd, cmd->t_data_sg, cmd->t_data_nents,
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cmd->data_direction);
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}
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static sense_reason_t compare_and_write_post(struct se_cmd *cmd, bool success,
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int *post_ret)
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{
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struct se_device *dev = cmd->se_dev;
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sense_reason_t ret = TCM_NO_SENSE;
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spin_lock_irq(&cmd->t_state_lock);
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if (success) {
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*post_ret = 1;
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if (cmd->scsi_status == SAM_STAT_CHECK_CONDITION)
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ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
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}
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spin_unlock_irq(&cmd->t_state_lock);
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/*
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* Unlock ->caw_sem originally obtained during sbc_compare_and_write()
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* before the original READ I/O submission.
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*/
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up(&dev->caw_sem);
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return ret;
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}
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/*
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* compare @cmp_len bytes of @read_sgl with @cmp_sgl. On miscompare, fill
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* @miscmp_off and return TCM_MISCOMPARE_VERIFY.
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*/
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static sense_reason_t
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compare_and_write_do_cmp(struct scatterlist *read_sgl, unsigned int read_nents,
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struct scatterlist *cmp_sgl, unsigned int cmp_nents,
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unsigned int cmp_len, unsigned int *miscmp_off)
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{
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unsigned char *buf = NULL;
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struct scatterlist *sg;
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sense_reason_t ret;
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unsigned int offset;
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size_t rc;
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int sg_cnt;
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buf = kzalloc(cmp_len, GFP_KERNEL);
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if (!buf) {
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ret = TCM_OUT_OF_RESOURCES;
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goto out;
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}
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rc = sg_copy_to_buffer(cmp_sgl, cmp_nents, buf, cmp_len);
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if (!rc) {
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pr_err("sg_copy_to_buffer() failed for compare_and_write\n");
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ret = TCM_OUT_OF_RESOURCES;
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goto out;
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}
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/*
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* Compare SCSI READ payload against verify payload
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*/
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offset = 0;
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ret = TCM_NO_SENSE;
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for_each_sg(read_sgl, sg, read_nents, sg_cnt) {
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unsigned int len = min(sg->length, cmp_len);
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unsigned char *addr = kmap_atomic(sg_page(sg));
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if (memcmp(addr, buf + offset, len)) {
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unsigned int i;
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for (i = 0; i < len && addr[i] == buf[offset + i]; i++)
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;
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*miscmp_off = offset + i;
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pr_warn("Detected MISCOMPARE at offset %u\n",
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*miscmp_off);
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ret = TCM_MISCOMPARE_VERIFY;
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}
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kunmap_atomic(addr);
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if (ret != TCM_NO_SENSE)
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goto out;
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offset += len;
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cmp_len -= len;
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if (!cmp_len)
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break;
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}
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pr_debug("COMPARE AND WRITE read data matches compare data\n");
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out:
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kfree(buf);
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return ret;
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}
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|
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static sense_reason_t compare_and_write_callback(struct se_cmd *cmd, bool success,
|
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int *post_ret)
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{
|
|
struct se_device *dev = cmd->se_dev;
|
|
struct sg_table write_tbl = { };
|
|
struct scatterlist *write_sg;
|
|
struct sg_mapping_iter m;
|
|
unsigned int len;
|
|
unsigned int block_size = dev->dev_attrib.block_size;
|
|
unsigned int compare_len = (cmd->t_task_nolb * block_size);
|
|
unsigned int miscmp_off = 0;
|
|
sense_reason_t ret = TCM_NO_SENSE;
|
|
int i;
|
|
|
|
/*
|
|
* Handle early failure in transport_generic_request_failure(),
|
|
* which will not have taken ->caw_sem yet..
|
|
*/
|
|
if (!success && (!cmd->t_data_sg || !cmd->t_bidi_data_sg))
|
|
return TCM_NO_SENSE;
|
|
/*
|
|
* Handle special case for zero-length COMPARE_AND_WRITE
|
|
*/
|
|
if (!cmd->data_length)
|
|
goto out;
|
|
/*
|
|
* Immediately exit + release dev->caw_sem if command has already
|
|
* been failed with a non-zero SCSI status.
|
|
*/
|
|
if (cmd->scsi_status) {
|
|
pr_debug("compare_and_write_callback: non zero scsi_status:"
|
|
" 0x%02x\n", cmd->scsi_status);
|
|
*post_ret = 1;
|
|
if (cmd->scsi_status == SAM_STAT_CHECK_CONDITION)
|
|
ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
|
goto out;
|
|
}
|
|
|
|
ret = compare_and_write_do_cmp(cmd->t_bidi_data_sg,
|
|
cmd->t_bidi_data_nents,
|
|
cmd->t_data_sg,
|
|
cmd->t_data_nents,
|
|
compare_len,
|
|
&miscmp_off);
|
|
if (ret == TCM_MISCOMPARE_VERIFY) {
|
|
/*
|
|
* SBC-4 r15: 5.3 COMPARE AND WRITE command
|
|
* In the sense data (see 4.18 and SPC-5) the offset from the
|
|
* start of the Data-Out Buffer to the first byte of data that
|
|
* was not equal shall be reported in the INFORMATION field.
|
|
*/
|
|
cmd->sense_info = miscmp_off;
|
|
goto out;
|
|
} else if (ret)
|
|
goto out;
|
|
|
|
if (sg_alloc_table(&write_tbl, cmd->t_data_nents, GFP_KERNEL) < 0) {
|
|
pr_err("Unable to allocate compare_and_write sg\n");
|
|
ret = TCM_OUT_OF_RESOURCES;
|
|
goto out;
|
|
}
|
|
write_sg = write_tbl.sgl;
|
|
|
|
i = 0;
|
|
len = compare_len;
|
|
sg_miter_start(&m, cmd->t_data_sg, cmd->t_data_nents, SG_MITER_TO_SG);
|
|
/*
|
|
* Currently assumes NoLB=1 and SGLs are PAGE_SIZE..
|
|
*/
|
|
while (len) {
|
|
sg_miter_next(&m);
|
|
|
|
if (block_size < PAGE_SIZE) {
|
|
sg_set_page(&write_sg[i], m.page, block_size,
|
|
m.piter.sg->offset + block_size);
|
|
} else {
|
|
sg_miter_next(&m);
|
|
sg_set_page(&write_sg[i], m.page, block_size,
|
|
m.piter.sg->offset);
|
|
}
|
|
len -= block_size;
|
|
i++;
|
|
}
|
|
sg_miter_stop(&m);
|
|
/*
|
|
* Save the original SGL + nents values before updating to new
|
|
* assignments, to be released in transport_free_pages() ->
|
|
* transport_reset_sgl_orig()
|
|
*/
|
|
cmd->t_data_sg_orig = cmd->t_data_sg;
|
|
cmd->t_data_sg = write_sg;
|
|
cmd->t_data_nents_orig = cmd->t_data_nents;
|
|
cmd->t_data_nents = 1;
|
|
|
|
cmd->sam_task_attr = TCM_HEAD_TAG;
|
|
cmd->transport_complete_callback = compare_and_write_post;
|
|
/*
|
|
* Now reset ->execute_cmd() to the normal sbc_execute_rw() handler
|
|
* for submitting the adjusted SGL to write instance user-data.
|
|
*/
|
|
cmd->execute_cmd = sbc_execute_rw;
|
|
|
|
spin_lock_irq(&cmd->t_state_lock);
|
|
cmd->t_state = TRANSPORT_PROCESSING;
|
|
cmd->transport_state |= CMD_T_ACTIVE | CMD_T_SENT;
|
|
spin_unlock_irq(&cmd->t_state_lock);
|
|
|
|
__target_execute_cmd(cmd, false);
|
|
|
|
return ret;
|
|
|
|
out:
|
|
/*
|
|
* In the MISCOMPARE or failure case, unlock ->caw_sem obtained in
|
|
* sbc_compare_and_write() before the original READ I/O submission.
|
|
*/
|
|
up(&dev->caw_sem);
|
|
sg_free_table(&write_tbl);
|
|
return ret;
|
|
}
|
|
|
|
static sense_reason_t
|
|
sbc_compare_and_write(struct se_cmd *cmd)
|
|
{
|
|
struct sbc_ops *ops = cmd->protocol_data;
|
|
struct se_device *dev = cmd->se_dev;
|
|
sense_reason_t ret;
|
|
int rc;
|
|
/*
|
|
* Submit the READ first for COMPARE_AND_WRITE to perform the
|
|
* comparision using SGLs at cmd->t_bidi_data_sg..
|
|
*/
|
|
rc = down_interruptible(&dev->caw_sem);
|
|
if (rc != 0) {
|
|
cmd->transport_complete_callback = NULL;
|
|
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
|
}
|
|
/*
|
|
* Reset cmd->data_length to individual block_size in order to not
|
|
* confuse backend drivers that depend on this value matching the
|
|
* size of the I/O being submitted.
|
|
*/
|
|
cmd->data_length = cmd->t_task_nolb * dev->dev_attrib.block_size;
|
|
|
|
ret = ops->execute_rw(cmd, cmd->t_bidi_data_sg, cmd->t_bidi_data_nents,
|
|
DMA_FROM_DEVICE);
|
|
if (ret) {
|
|
cmd->transport_complete_callback = NULL;
|
|
up(&dev->caw_sem);
|
|
return ret;
|
|
}
|
|
/*
|
|
* Unlock of dev->caw_sem to occur in compare_and_write_callback()
|
|
* upon MISCOMPARE, or in compare_and_write_done() upon completion
|
|
* of WRITE instance user-data.
|
|
*/
|
|
return TCM_NO_SENSE;
|
|
}
|
|
|
|
static int
|
|
sbc_set_prot_op_checks(u8 protect, bool fabric_prot, enum target_prot_type prot_type,
|
|
bool is_write, struct se_cmd *cmd)
|
|
{
|
|
if (is_write) {
|
|
cmd->prot_op = fabric_prot ? TARGET_PROT_DOUT_STRIP :
|
|
protect ? TARGET_PROT_DOUT_PASS :
|
|
TARGET_PROT_DOUT_INSERT;
|
|
switch (protect) {
|
|
case 0x0:
|
|
case 0x3:
|
|
cmd->prot_checks = 0;
|
|
break;
|
|
case 0x1:
|
|
case 0x5:
|
|
cmd->prot_checks = TARGET_DIF_CHECK_GUARD;
|
|
if (prot_type == TARGET_DIF_TYPE1_PROT)
|
|
cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG;
|
|
break;
|
|
case 0x2:
|
|
if (prot_type == TARGET_DIF_TYPE1_PROT)
|
|
cmd->prot_checks = TARGET_DIF_CHECK_REFTAG;
|
|
break;
|
|
case 0x4:
|
|
cmd->prot_checks = TARGET_DIF_CHECK_GUARD;
|
|
break;
|
|
default:
|
|
pr_err("Unsupported protect field %d\n", protect);
|
|
return -EINVAL;
|
|
}
|
|
} else {
|
|
cmd->prot_op = fabric_prot ? TARGET_PROT_DIN_INSERT :
|
|
protect ? TARGET_PROT_DIN_PASS :
|
|
TARGET_PROT_DIN_STRIP;
|
|
switch (protect) {
|
|
case 0x0:
|
|
case 0x1:
|
|
case 0x5:
|
|
cmd->prot_checks = TARGET_DIF_CHECK_GUARD;
|
|
if (prot_type == TARGET_DIF_TYPE1_PROT)
|
|
cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG;
|
|
break;
|
|
case 0x2:
|
|
if (prot_type == TARGET_DIF_TYPE1_PROT)
|
|
cmd->prot_checks = TARGET_DIF_CHECK_REFTAG;
|
|
break;
|
|
case 0x3:
|
|
cmd->prot_checks = 0;
|
|
break;
|
|
case 0x4:
|
|
cmd->prot_checks = TARGET_DIF_CHECK_GUARD;
|
|
break;
|
|
default:
|
|
pr_err("Unsupported protect field %d\n", protect);
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static sense_reason_t
|
|
sbc_check_prot(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb,
|
|
u32 sectors, bool is_write)
|
|
{
|
|
u8 protect = cdb[1] >> 5;
|
|
int sp_ops = cmd->se_sess->sup_prot_ops;
|
|
int pi_prot_type = dev->dev_attrib.pi_prot_type;
|
|
bool fabric_prot = false;
|
|
|
|
if (!cmd->t_prot_sg || !cmd->t_prot_nents) {
|
|
if (unlikely(protect &&
|
|
!dev->dev_attrib.pi_prot_type && !cmd->se_sess->sess_prot_type)) {
|
|
pr_err("CDB contains protect bit, but device + fabric does"
|
|
" not advertise PROTECT=1 feature bit\n");
|
|
return TCM_INVALID_CDB_FIELD;
|
|
}
|
|
if (cmd->prot_pto)
|
|
return TCM_NO_SENSE;
|
|
}
|
|
|
|
switch (dev->dev_attrib.pi_prot_type) {
|
|
case TARGET_DIF_TYPE3_PROT:
|
|
cmd->reftag_seed = 0xffffffff;
|
|
break;
|
|
case TARGET_DIF_TYPE2_PROT:
|
|
if (protect)
|
|
return TCM_INVALID_CDB_FIELD;
|
|
|
|
cmd->reftag_seed = cmd->t_task_lba;
|
|
break;
|
|
case TARGET_DIF_TYPE1_PROT:
|
|
cmd->reftag_seed = cmd->t_task_lba;
|
|
break;
|
|
case TARGET_DIF_TYPE0_PROT:
|
|
/*
|
|
* See if the fabric supports T10-PI, and the session has been
|
|
* configured to allow export PROTECT=1 feature bit with backend
|
|
* devices that don't support T10-PI.
|
|
*/
|
|
fabric_prot = is_write ?
|
|
!!(sp_ops & (TARGET_PROT_DOUT_PASS | TARGET_PROT_DOUT_STRIP)) :
|
|
!!(sp_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DIN_INSERT));
|
|
|
|
if (fabric_prot && cmd->se_sess->sess_prot_type) {
|
|
pi_prot_type = cmd->se_sess->sess_prot_type;
|
|
break;
|
|
}
|
|
if (!protect)
|
|
return TCM_NO_SENSE;
|
|
fallthrough;
|
|
default:
|
|
pr_err("Unable to determine pi_prot_type for CDB: 0x%02x "
|
|
"PROTECT: 0x%02x\n", cdb[0], protect);
|
|
return TCM_INVALID_CDB_FIELD;
|
|
}
|
|
|
|
if (sbc_set_prot_op_checks(protect, fabric_prot, pi_prot_type, is_write, cmd))
|
|
return TCM_INVALID_CDB_FIELD;
|
|
|
|
cmd->prot_type = pi_prot_type;
|
|
cmd->prot_length = dev->prot_length * sectors;
|
|
|
|
/**
|
|
* In case protection information exists over the wire
|
|
* we modify command data length to describe pure data.
|
|
* The actual transfer length is data length + protection
|
|
* length
|
|
**/
|
|
if (protect)
|
|
cmd->data_length = sectors * dev->dev_attrib.block_size;
|
|
|
|
pr_debug("%s: prot_type=%d, data_length=%d, prot_length=%d "
|
|
"prot_op=%d prot_checks=%d\n",
|
|
__func__, cmd->prot_type, cmd->data_length, cmd->prot_length,
|
|
cmd->prot_op, cmd->prot_checks);
|
|
|
|
return TCM_NO_SENSE;
|
|
}
|
|
|
|
static int
|
|
sbc_check_dpofua(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb)
|
|
{
|
|
if (cdb[1] & 0x10) {
|
|
/* see explanation in spc_emulate_modesense */
|
|
if (!target_check_fua(dev)) {
|
|
pr_err("Got CDB: 0x%02x with DPO bit set, but device"
|
|
" does not advertise support for DPO\n", cdb[0]);
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
if (cdb[1] & 0x8) {
|
|
if (!target_check_fua(dev)) {
|
|
pr_err("Got CDB: 0x%02x with FUA bit set, but device"
|
|
" does not advertise support for FUA write\n",
|
|
cdb[0]);
|
|
return -EINVAL;
|
|
}
|
|
cmd->se_cmd_flags |= SCF_FUA;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
sense_reason_t
|
|
sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops)
|
|
{
|
|
struct se_device *dev = cmd->se_dev;
|
|
unsigned char *cdb = cmd->t_task_cdb;
|
|
unsigned int size;
|
|
u32 sectors = 0;
|
|
sense_reason_t ret;
|
|
|
|
cmd->protocol_data = ops;
|
|
|
|
switch (cdb[0]) {
|
|
case READ_6:
|
|
sectors = transport_get_sectors_6(cdb);
|
|
cmd->t_task_lba = transport_lba_21(cdb);
|
|
cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
|
|
cmd->execute_cmd = sbc_execute_rw;
|
|
break;
|
|
case READ_10:
|
|
sectors = transport_get_sectors_10(cdb);
|
|
cmd->t_task_lba = transport_lba_32(cdb);
|
|
|
|
if (sbc_check_dpofua(dev, cmd, cdb))
|
|
return TCM_INVALID_CDB_FIELD;
|
|
|
|
ret = sbc_check_prot(dev, cmd, cdb, sectors, false);
|
|
if (ret)
|
|
return ret;
|
|
|
|
cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
|
|
cmd->execute_cmd = sbc_execute_rw;
|
|
break;
|
|
case READ_12:
|
|
sectors = transport_get_sectors_12(cdb);
|
|
cmd->t_task_lba = transport_lba_32(cdb);
|
|
|
|
if (sbc_check_dpofua(dev, cmd, cdb))
|
|
return TCM_INVALID_CDB_FIELD;
|
|
|
|
ret = sbc_check_prot(dev, cmd, cdb, sectors, false);
|
|
if (ret)
|
|
return ret;
|
|
|
|
cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
|
|
cmd->execute_cmd = sbc_execute_rw;
|
|
break;
|
|
case READ_16:
|
|
sectors = transport_get_sectors_16(cdb);
|
|
cmd->t_task_lba = transport_lba_64(cdb);
|
|
|
|
if (sbc_check_dpofua(dev, cmd, cdb))
|
|
return TCM_INVALID_CDB_FIELD;
|
|
|
|
ret = sbc_check_prot(dev, cmd, cdb, sectors, false);
|
|
if (ret)
|
|
return ret;
|
|
|
|
cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
|
|
cmd->execute_cmd = sbc_execute_rw;
|
|
break;
|
|
case WRITE_6:
|
|
sectors = transport_get_sectors_6(cdb);
|
|
cmd->t_task_lba = transport_lba_21(cdb);
|
|
cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
|
|
cmd->execute_cmd = sbc_execute_rw;
|
|
break;
|
|
case WRITE_10:
|
|
case WRITE_VERIFY:
|
|
sectors = transport_get_sectors_10(cdb);
|
|
cmd->t_task_lba = transport_lba_32(cdb);
|
|
|
|
if (sbc_check_dpofua(dev, cmd, cdb))
|
|
return TCM_INVALID_CDB_FIELD;
|
|
|
|
ret = sbc_check_prot(dev, cmd, cdb, sectors, true);
|
|
if (ret)
|
|
return ret;
|
|
|
|
cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
|
|
cmd->execute_cmd = sbc_execute_rw;
|
|
break;
|
|
case WRITE_12:
|
|
sectors = transport_get_sectors_12(cdb);
|
|
cmd->t_task_lba = transport_lba_32(cdb);
|
|
|
|
if (sbc_check_dpofua(dev, cmd, cdb))
|
|
return TCM_INVALID_CDB_FIELD;
|
|
|
|
ret = sbc_check_prot(dev, cmd, cdb, sectors, true);
|
|
if (ret)
|
|
return ret;
|
|
|
|
cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
|
|
cmd->execute_cmd = sbc_execute_rw;
|
|
break;
|
|
case WRITE_16:
|
|
case WRITE_VERIFY_16:
|
|
sectors = transport_get_sectors_16(cdb);
|
|
cmd->t_task_lba = transport_lba_64(cdb);
|
|
|
|
if (sbc_check_dpofua(dev, cmd, cdb))
|
|
return TCM_INVALID_CDB_FIELD;
|
|
|
|
ret = sbc_check_prot(dev, cmd, cdb, sectors, true);
|
|
if (ret)
|
|
return ret;
|
|
|
|
cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
|
|
cmd->execute_cmd = sbc_execute_rw;
|
|
break;
|
|
case XDWRITEREAD_10:
|
|
if (cmd->data_direction != DMA_TO_DEVICE ||
|
|
!(cmd->se_cmd_flags & SCF_BIDI))
|
|
return TCM_INVALID_CDB_FIELD;
|
|
sectors = transport_get_sectors_10(cdb);
|
|
|
|
if (sbc_check_dpofua(dev, cmd, cdb))
|
|
return TCM_INVALID_CDB_FIELD;
|
|
|
|
cmd->t_task_lba = transport_lba_32(cdb);
|
|
cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
|
|
|
|
/*
|
|
* Setup BIDI XOR callback to be run after I/O completion.
|
|
*/
|
|
cmd->execute_cmd = sbc_execute_rw;
|
|
cmd->transport_complete_callback = &xdreadwrite_callback;
|
|
break;
|
|
case VARIABLE_LENGTH_CMD:
|
|
{
|
|
u16 service_action = get_unaligned_be16(&cdb[8]);
|
|
switch (service_action) {
|
|
case XDWRITEREAD_32:
|
|
sectors = transport_get_sectors_32(cdb);
|
|
|
|
if (sbc_check_dpofua(dev, cmd, cdb))
|
|
return TCM_INVALID_CDB_FIELD;
|
|
/*
|
|
* Use WRITE_32 and READ_32 opcodes for the emulated
|
|
* XDWRITE_READ_32 logic.
|
|
*/
|
|
cmd->t_task_lba = transport_lba_64_ext(cdb);
|
|
cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
|
|
|
|
/*
|
|
* Setup BIDI XOR callback to be run during after I/O
|
|
* completion.
|
|
*/
|
|
cmd->execute_cmd = sbc_execute_rw;
|
|
cmd->transport_complete_callback = &xdreadwrite_callback;
|
|
break;
|
|
case WRITE_SAME_32:
|
|
sectors = transport_get_sectors_32(cdb);
|
|
if (!sectors) {
|
|
pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
|
|
" supported\n");
|
|
return TCM_INVALID_CDB_FIELD;
|
|
}
|
|
|
|
size = sbc_get_size(cmd, 1);
|
|
cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
|
|
|
|
ret = sbc_setup_write_same(cmd, &cdb[10], ops);
|
|
if (ret)
|
|
return ret;
|
|
break;
|
|
default:
|
|
pr_err("VARIABLE_LENGTH_CMD service action"
|
|
" 0x%04x not supported\n", service_action);
|
|
return TCM_UNSUPPORTED_SCSI_OPCODE;
|
|
}
|
|
break;
|
|
}
|
|
case COMPARE_AND_WRITE:
|
|
if (!dev->dev_attrib.emulate_caw) {
|
|
pr_err_ratelimited("se_device %s/%s (vpd_unit_serial %s) reject COMPARE_AND_WRITE\n",
|
|
dev->se_hba->backend->ops->name,
|
|
config_item_name(&dev->dev_group.cg_item),
|
|
dev->t10_wwn.unit_serial);
|
|
return TCM_UNSUPPORTED_SCSI_OPCODE;
|
|
}
|
|
sectors = cdb[13];
|
|
/*
|
|
* Currently enforce COMPARE_AND_WRITE for a single sector
|
|
*/
|
|
if (sectors > 1) {
|
|
pr_err("COMPARE_AND_WRITE contains NoLB: %u greater"
|
|
" than 1\n", sectors);
|
|
return TCM_INVALID_CDB_FIELD;
|
|
}
|
|
if (sbc_check_dpofua(dev, cmd, cdb))
|
|
return TCM_INVALID_CDB_FIELD;
|
|
|
|
/*
|
|
* Double size because we have two buffers, note that
|
|
* zero is not an error..
|
|
*/
|
|
size = 2 * sbc_get_size(cmd, sectors);
|
|
cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
|
|
cmd->t_task_nolb = sectors;
|
|
cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB | SCF_COMPARE_AND_WRITE;
|
|
cmd->execute_cmd = sbc_compare_and_write;
|
|
cmd->transport_complete_callback = compare_and_write_callback;
|
|
break;
|
|
case READ_CAPACITY:
|
|
size = READ_CAP_LEN;
|
|
cmd->execute_cmd = sbc_emulate_readcapacity;
|
|
break;
|
|
case SERVICE_ACTION_IN_16:
|
|
switch (cmd->t_task_cdb[1] & 0x1f) {
|
|
case SAI_READ_CAPACITY_16:
|
|
cmd->execute_cmd = sbc_emulate_readcapacity_16;
|
|
break;
|
|
case SAI_REPORT_REFERRALS:
|
|
cmd->execute_cmd = target_emulate_report_referrals;
|
|
break;
|
|
default:
|
|
pr_err("Unsupported SA: 0x%02x\n",
|
|
cmd->t_task_cdb[1] & 0x1f);
|
|
return TCM_INVALID_CDB_FIELD;
|
|
}
|
|
size = get_unaligned_be32(&cdb[10]);
|
|
break;
|
|
case SYNCHRONIZE_CACHE:
|
|
case SYNCHRONIZE_CACHE_16:
|
|
if (cdb[0] == SYNCHRONIZE_CACHE) {
|
|
sectors = transport_get_sectors_10(cdb);
|
|
cmd->t_task_lba = transport_lba_32(cdb);
|
|
} else {
|
|
sectors = transport_get_sectors_16(cdb);
|
|
cmd->t_task_lba = transport_lba_64(cdb);
|
|
}
|
|
if (ops->execute_sync_cache) {
|
|
cmd->execute_cmd = ops->execute_sync_cache;
|
|
goto check_lba;
|
|
}
|
|
size = 0;
|
|
cmd->execute_cmd = sbc_emulate_noop;
|
|
break;
|
|
case UNMAP:
|
|
if (!ops->execute_unmap)
|
|
return TCM_UNSUPPORTED_SCSI_OPCODE;
|
|
|
|
if (!dev->dev_attrib.emulate_tpu) {
|
|
pr_err("Got UNMAP, but backend device has"
|
|
" emulate_tpu disabled\n");
|
|
return TCM_UNSUPPORTED_SCSI_OPCODE;
|
|
}
|
|
size = get_unaligned_be16(&cdb[7]);
|
|
cmd->execute_cmd = sbc_execute_unmap;
|
|
break;
|
|
case WRITE_SAME_16:
|
|
sectors = transport_get_sectors_16(cdb);
|
|
if (!sectors) {
|
|
pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
|
|
return TCM_INVALID_CDB_FIELD;
|
|
}
|
|
|
|
size = sbc_get_size(cmd, 1);
|
|
cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
|
|
|
|
ret = sbc_setup_write_same(cmd, &cdb[1], ops);
|
|
if (ret)
|
|
return ret;
|
|
break;
|
|
case WRITE_SAME:
|
|
sectors = transport_get_sectors_10(cdb);
|
|
if (!sectors) {
|
|
pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
|
|
return TCM_INVALID_CDB_FIELD;
|
|
}
|
|
|
|
size = sbc_get_size(cmd, 1);
|
|
cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
|
|
|
|
/*
|
|
* Follow sbcr26 with WRITE_SAME (10) and check for the existence
|
|
* of byte 1 bit 3 UNMAP instead of original reserved field
|
|
*/
|
|
ret = sbc_setup_write_same(cmd, &cdb[1], ops);
|
|
if (ret)
|
|
return ret;
|
|
break;
|
|
case VERIFY:
|
|
case VERIFY_16:
|
|
size = 0;
|
|
if (cdb[0] == VERIFY) {
|
|
sectors = transport_get_sectors_10(cdb);
|
|
cmd->t_task_lba = transport_lba_32(cdb);
|
|
} else {
|
|
sectors = transport_get_sectors_16(cdb);
|
|
cmd->t_task_lba = transport_lba_64(cdb);
|
|
}
|
|
cmd->execute_cmd = sbc_emulate_noop;
|
|
goto check_lba;
|
|
case REZERO_UNIT:
|
|
case SEEK_6:
|
|
case SEEK_10:
|
|
/*
|
|
* There are still clients out there which use these old SCSI-2
|
|
* commands. This mainly happens when running VMs with legacy
|
|
* guest systems, connected via SCSI command pass-through to
|
|
* iSCSI targets. Make them happy and return status GOOD.
|
|
*/
|
|
size = 0;
|
|
cmd->execute_cmd = sbc_emulate_noop;
|
|
break;
|
|
case START_STOP:
|
|
size = 0;
|
|
cmd->execute_cmd = sbc_emulate_startstop;
|
|
break;
|
|
default:
|
|
ret = spc_parse_cdb(cmd, &size);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
/* reject any command that we don't have a handler for */
|
|
if (!cmd->execute_cmd)
|
|
return TCM_UNSUPPORTED_SCSI_OPCODE;
|
|
|
|
if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) {
|
|
unsigned long long end_lba;
|
|
check_lba:
|
|
end_lba = dev->transport->get_blocks(dev) + 1;
|
|
if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) ||
|
|
((cmd->t_task_lba + sectors) > end_lba)) {
|
|
pr_err("cmd exceeds last lba %llu "
|
|
"(lba %llu, sectors %u)\n",
|
|
end_lba, cmd->t_task_lba, sectors);
|
|
return TCM_ADDRESS_OUT_OF_RANGE;
|
|
}
|
|
|
|
if (!(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE))
|
|
size = sbc_get_size(cmd, sectors);
|
|
}
|
|
|
|
return target_cmd_size_check(cmd, size);
|
|
}
|
|
EXPORT_SYMBOL(sbc_parse_cdb);
|
|
|
|
u32 sbc_get_device_type(struct se_device *dev)
|
|
{
|
|
return TYPE_DISK;
|
|
}
|
|
EXPORT_SYMBOL(sbc_get_device_type);
|
|
|
|
static sense_reason_t
|
|
sbc_execute_unmap(struct se_cmd *cmd)
|
|
{
|
|
struct sbc_ops *ops = cmd->protocol_data;
|
|
struct se_device *dev = cmd->se_dev;
|
|
unsigned char *buf, *ptr = NULL;
|
|
sector_t lba;
|
|
int size;
|
|
u32 range;
|
|
sense_reason_t ret = 0;
|
|
int dl, bd_dl;
|
|
|
|
/* We never set ANC_SUP */
|
|
if (cmd->t_task_cdb[1])
|
|
return TCM_INVALID_CDB_FIELD;
|
|
|
|
if (cmd->data_length == 0) {
|
|
target_complete_cmd(cmd, SAM_STAT_GOOD);
|
|
return 0;
|
|
}
|
|
|
|
if (cmd->data_length < 8) {
|
|
pr_warn("UNMAP parameter list length %u too small\n",
|
|
cmd->data_length);
|
|
return TCM_PARAMETER_LIST_LENGTH_ERROR;
|
|
}
|
|
|
|
buf = transport_kmap_data_sg(cmd);
|
|
if (!buf)
|
|
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
|
|
|
dl = get_unaligned_be16(&buf[0]);
|
|
bd_dl = get_unaligned_be16(&buf[2]);
|
|
|
|
size = cmd->data_length - 8;
|
|
if (bd_dl > size)
|
|
pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n",
|
|
cmd->data_length, bd_dl);
|
|
else
|
|
size = bd_dl;
|
|
|
|
if (size / 16 > dev->dev_attrib.max_unmap_block_desc_count) {
|
|
ret = TCM_INVALID_PARAMETER_LIST;
|
|
goto err;
|
|
}
|
|
|
|
/* First UNMAP block descriptor starts at 8 byte offset */
|
|
ptr = &buf[8];
|
|
pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u"
|
|
" ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr);
|
|
|
|
while (size >= 16) {
|
|
lba = get_unaligned_be64(&ptr[0]);
|
|
range = get_unaligned_be32(&ptr[8]);
|
|
pr_debug("UNMAP: Using lba: %llu and range: %u\n",
|
|
(unsigned long long)lba, range);
|
|
|
|
if (range > dev->dev_attrib.max_unmap_lba_count) {
|
|
ret = TCM_INVALID_PARAMETER_LIST;
|
|
goto err;
|
|
}
|
|
|
|
if (lba + range > dev->transport->get_blocks(dev) + 1) {
|
|
ret = TCM_ADDRESS_OUT_OF_RANGE;
|
|
goto err;
|
|
}
|
|
|
|
if (range) {
|
|
ret = ops->execute_unmap(cmd, lba, range);
|
|
if (ret)
|
|
goto err;
|
|
}
|
|
|
|
ptr += 16;
|
|
size -= 16;
|
|
}
|
|
|
|
err:
|
|
transport_kunmap_data_sg(cmd);
|
|
if (!ret)
|
|
target_complete_cmd(cmd, SAM_STAT_GOOD);
|
|
return ret;
|
|
}
|
|
|
|
void
|
|
sbc_dif_generate(struct se_cmd *cmd)
|
|
{
|
|
struct se_device *dev = cmd->se_dev;
|
|
struct t10_pi_tuple *sdt;
|
|
struct scatterlist *dsg = cmd->t_data_sg, *psg;
|
|
sector_t sector = cmd->t_task_lba;
|
|
void *daddr, *paddr;
|
|
int i, j, offset = 0;
|
|
unsigned int block_size = dev->dev_attrib.block_size;
|
|
|
|
for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) {
|
|
paddr = kmap_atomic(sg_page(psg)) + psg->offset;
|
|
daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
|
|
|
|
for (j = 0; j < psg->length;
|
|
j += sizeof(*sdt)) {
|
|
__u16 crc;
|
|
unsigned int avail;
|
|
|
|
if (offset >= dsg->length) {
|
|
offset -= dsg->length;
|
|
kunmap_atomic(daddr - dsg->offset);
|
|
dsg = sg_next(dsg);
|
|
if (!dsg) {
|
|
kunmap_atomic(paddr - psg->offset);
|
|
return;
|
|
}
|
|
daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
|
|
}
|
|
|
|
sdt = paddr + j;
|
|
avail = min(block_size, dsg->length - offset);
|
|
crc = crc_t10dif(daddr + offset, avail);
|
|
if (avail < block_size) {
|
|
kunmap_atomic(daddr - dsg->offset);
|
|
dsg = sg_next(dsg);
|
|
if (!dsg) {
|
|
kunmap_atomic(paddr - psg->offset);
|
|
return;
|
|
}
|
|
daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
|
|
offset = block_size - avail;
|
|
crc = crc_t10dif_update(crc, daddr, offset);
|
|
} else {
|
|
offset += block_size;
|
|
}
|
|
|
|
sdt->guard_tag = cpu_to_be16(crc);
|
|
if (cmd->prot_type == TARGET_DIF_TYPE1_PROT)
|
|
sdt->ref_tag = cpu_to_be32(sector & 0xffffffff);
|
|
sdt->app_tag = 0;
|
|
|
|
pr_debug("DIF %s INSERT sector: %llu guard_tag: 0x%04x"
|
|
" app_tag: 0x%04x ref_tag: %u\n",
|
|
(cmd->data_direction == DMA_TO_DEVICE) ?
|
|
"WRITE" : "READ", (unsigned long long)sector,
|
|
sdt->guard_tag, sdt->app_tag,
|
|
be32_to_cpu(sdt->ref_tag));
|
|
|
|
sector++;
|
|
}
|
|
|
|
kunmap_atomic(daddr - dsg->offset);
|
|
kunmap_atomic(paddr - psg->offset);
|
|
}
|
|
}
|
|
|
|
static sense_reason_t
|
|
sbc_dif_v1_verify(struct se_cmd *cmd, struct t10_pi_tuple *sdt,
|
|
__u16 crc, sector_t sector, unsigned int ei_lba)
|
|
{
|
|
__be16 csum;
|
|
|
|
if (!(cmd->prot_checks & TARGET_DIF_CHECK_GUARD))
|
|
goto check_ref;
|
|
|
|
csum = cpu_to_be16(crc);
|
|
|
|
if (sdt->guard_tag != csum) {
|
|
pr_err("DIFv1 checksum failed on sector %llu guard tag 0x%04x"
|
|
" csum 0x%04x\n", (unsigned long long)sector,
|
|
be16_to_cpu(sdt->guard_tag), be16_to_cpu(csum));
|
|
return TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
|
|
}
|
|
|
|
check_ref:
|
|
if (!(cmd->prot_checks & TARGET_DIF_CHECK_REFTAG))
|
|
return 0;
|
|
|
|
if (cmd->prot_type == TARGET_DIF_TYPE1_PROT &&
|
|
be32_to_cpu(sdt->ref_tag) != (sector & 0xffffffff)) {
|
|
pr_err("DIFv1 Type 1 reference failed on sector: %llu tag: 0x%08x"
|
|
" sector MSB: 0x%08x\n", (unsigned long long)sector,
|
|
be32_to_cpu(sdt->ref_tag), (u32)(sector & 0xffffffff));
|
|
return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
|
|
}
|
|
|
|
if (cmd->prot_type == TARGET_DIF_TYPE2_PROT &&
|
|
be32_to_cpu(sdt->ref_tag) != ei_lba) {
|
|
pr_err("DIFv1 Type 2 reference failed on sector: %llu tag: 0x%08x"
|
|
" ei_lba: 0x%08x\n", (unsigned long long)sector,
|
|
be32_to_cpu(sdt->ref_tag), ei_lba);
|
|
return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void sbc_dif_copy_prot(struct se_cmd *cmd, unsigned int sectors, bool read,
|
|
struct scatterlist *sg, int sg_off)
|
|
{
|
|
struct se_device *dev = cmd->se_dev;
|
|
struct scatterlist *psg;
|
|
void *paddr, *addr;
|
|
unsigned int i, len, left;
|
|
unsigned int offset = sg_off;
|
|
|
|
if (!sg)
|
|
return;
|
|
|
|
left = sectors * dev->prot_length;
|
|
|
|
for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) {
|
|
unsigned int psg_len, copied = 0;
|
|
|
|
paddr = kmap_atomic(sg_page(psg)) + psg->offset;
|
|
psg_len = min(left, psg->length);
|
|
while (psg_len) {
|
|
len = min(psg_len, sg->length - offset);
|
|
addr = kmap_atomic(sg_page(sg)) + sg->offset + offset;
|
|
|
|
if (read)
|
|
memcpy(paddr + copied, addr, len);
|
|
else
|
|
memcpy(addr, paddr + copied, len);
|
|
|
|
left -= len;
|
|
offset += len;
|
|
copied += len;
|
|
psg_len -= len;
|
|
|
|
kunmap_atomic(addr - sg->offset - offset);
|
|
|
|
if (offset >= sg->length) {
|
|
sg = sg_next(sg);
|
|
offset = 0;
|
|
}
|
|
}
|
|
kunmap_atomic(paddr - psg->offset);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(sbc_dif_copy_prot);
|
|
|
|
sense_reason_t
|
|
sbc_dif_verify(struct se_cmd *cmd, sector_t start, unsigned int sectors,
|
|
unsigned int ei_lba, struct scatterlist *psg, int psg_off)
|
|
{
|
|
struct se_device *dev = cmd->se_dev;
|
|
struct t10_pi_tuple *sdt;
|
|
struct scatterlist *dsg = cmd->t_data_sg;
|
|
sector_t sector = start;
|
|
void *daddr, *paddr;
|
|
int i;
|
|
sense_reason_t rc;
|
|
int dsg_off = 0;
|
|
unsigned int block_size = dev->dev_attrib.block_size;
|
|
|
|
for (; psg && sector < start + sectors; psg = sg_next(psg)) {
|
|
paddr = kmap_atomic(sg_page(psg)) + psg->offset;
|
|
daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
|
|
|
|
for (i = psg_off; i < psg->length &&
|
|
sector < start + sectors;
|
|
i += sizeof(*sdt)) {
|
|
__u16 crc;
|
|
unsigned int avail;
|
|
|
|
if (dsg_off >= dsg->length) {
|
|
dsg_off -= dsg->length;
|
|
kunmap_atomic(daddr - dsg->offset);
|
|
dsg = sg_next(dsg);
|
|
if (!dsg) {
|
|
kunmap_atomic(paddr - psg->offset);
|
|
return 0;
|
|
}
|
|
daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
|
|
}
|
|
|
|
sdt = paddr + i;
|
|
|
|
pr_debug("DIF READ sector: %llu guard_tag: 0x%04x"
|
|
" app_tag: 0x%04x ref_tag: %u\n",
|
|
(unsigned long long)sector, sdt->guard_tag,
|
|
sdt->app_tag, be32_to_cpu(sdt->ref_tag));
|
|
|
|
if (sdt->app_tag == T10_PI_APP_ESCAPE) {
|
|
dsg_off += block_size;
|
|
goto next;
|
|
}
|
|
|
|
avail = min(block_size, dsg->length - dsg_off);
|
|
crc = crc_t10dif(daddr + dsg_off, avail);
|
|
if (avail < block_size) {
|
|
kunmap_atomic(daddr - dsg->offset);
|
|
dsg = sg_next(dsg);
|
|
if (!dsg) {
|
|
kunmap_atomic(paddr - psg->offset);
|
|
return 0;
|
|
}
|
|
daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
|
|
dsg_off = block_size - avail;
|
|
crc = crc_t10dif_update(crc, daddr, dsg_off);
|
|
} else {
|
|
dsg_off += block_size;
|
|
}
|
|
|
|
rc = sbc_dif_v1_verify(cmd, sdt, crc, sector, ei_lba);
|
|
if (rc) {
|
|
kunmap_atomic(daddr - dsg->offset);
|
|
kunmap_atomic(paddr - psg->offset);
|
|
cmd->sense_info = sector;
|
|
return rc;
|
|
}
|
|
next:
|
|
sector++;
|
|
ei_lba++;
|
|
}
|
|
|
|
psg_off = 0;
|
|
kunmap_atomic(daddr - dsg->offset);
|
|
kunmap_atomic(paddr - psg->offset);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(sbc_dif_verify);
|