| /* |
| * SCSI Block Commands (SBC) parsing and emulation. |
| * |
| * (c) Copyright 2002-2013 Datera, Inc. |
| * |
| * Nicholas A. Bellinger <nab@kernel.org> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/ratelimit.h> |
| #include <linux/crc-t10dif.h> |
| #include <asm/unaligned.h> |
| #include <scsi/scsi_proto.h> |
| #include <scsi/scsi_tcq.h> |
| |
| #include <target/target_core_base.h> |
| #include <target/target_core_backend.h> |
| #include <target/target_core_fabric.h> |
| |
| #include "target_core_internal.h" |
| #include "target_core_ua.h" |
| #include "target_core_alua.h" |
| |
| static sense_reason_t |
| sbc_check_prot(struct se_device *, struct se_cmd *, unsigned char *, u32, bool); |
| static sense_reason_t sbc_execute_unmap(struct se_cmd *cmd); |
| |
| static sense_reason_t |
| sbc_emulate_readcapacity(struct se_cmd *cmd) |
| { |
| struct se_device *dev = cmd->se_dev; |
| unsigned char *cdb = cmd->t_task_cdb; |
| unsigned long long blocks_long = dev->transport->get_blocks(dev); |
| unsigned char *rbuf; |
| unsigned char buf[8]; |
| u32 blocks; |
| |
| /* |
| * SBC-2 says: |
| * If the PMI bit is set to zero and the LOGICAL BLOCK |
| * ADDRESS field is not set to zero, the device server shall |
| * terminate the command with CHECK CONDITION status with |
| * the sense key set to ILLEGAL REQUEST and the additional |
| * sense code set to INVALID FIELD IN CDB. |
| * |
| * In SBC-3, these fields are obsolete, but some SCSI |
| * compliance tests actually check this, so we might as well |
| * follow SBC-2. |
| */ |
| if (!(cdb[8] & 1) && !!(cdb[2] | cdb[3] | cdb[4] | cdb[5])) |
| return TCM_INVALID_CDB_FIELD; |
| |
| if (blocks_long >= 0x00000000ffffffff) |
| blocks = 0xffffffff; |
| else |
| blocks = (u32)blocks_long; |
| |
| buf[0] = (blocks >> 24) & 0xff; |
| buf[1] = (blocks >> 16) & 0xff; |
| buf[2] = (blocks >> 8) & 0xff; |
| buf[3] = blocks & 0xff; |
| buf[4] = (dev->dev_attrib.block_size >> 24) & 0xff; |
| buf[5] = (dev->dev_attrib.block_size >> 16) & 0xff; |
| buf[6] = (dev->dev_attrib.block_size >> 8) & 0xff; |
| buf[7] = dev->dev_attrib.block_size & 0xff; |
| |
| rbuf = transport_kmap_data_sg(cmd); |
| if (rbuf) { |
| memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); |
| transport_kunmap_data_sg(cmd); |
| } |
| |
| target_complete_cmd_with_length(cmd, GOOD, 8); |
| return 0; |
| } |
| |
| static sense_reason_t |
| sbc_emulate_readcapacity_16(struct se_cmd *cmd) |
| { |
| struct se_device *dev = cmd->se_dev; |
| struct se_session *sess = cmd->se_sess; |
| int pi_prot_type = dev->dev_attrib.pi_prot_type; |
| |
| unsigned char *rbuf; |
| unsigned char buf[32]; |
| unsigned long long blocks = dev->transport->get_blocks(dev); |
| |
| memset(buf, 0, sizeof(buf)); |
| buf[0] = (blocks >> 56) & 0xff; |
| buf[1] = (blocks >> 48) & 0xff; |
| buf[2] = (blocks >> 40) & 0xff; |
| buf[3] = (blocks >> 32) & 0xff; |
| buf[4] = (blocks >> 24) & 0xff; |
| buf[5] = (blocks >> 16) & 0xff; |
| buf[6] = (blocks >> 8) & 0xff; |
| buf[7] = blocks & 0xff; |
| buf[8] = (dev->dev_attrib.block_size >> 24) & 0xff; |
| buf[9] = (dev->dev_attrib.block_size >> 16) & 0xff; |
| buf[10] = (dev->dev_attrib.block_size >> 8) & 0xff; |
| buf[11] = dev->dev_attrib.block_size & 0xff; |
| /* |
| * Set P_TYPE and PROT_EN bits for DIF support |
| */ |
| if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) { |
| /* |
| * Only override a device's pi_prot_type if no T10-PI is |
| * available, and sess_prot_type has been explicitly enabled. |
| */ |
| if (!pi_prot_type) |
| pi_prot_type = sess->sess_prot_type; |
| |
| if (pi_prot_type) |
| buf[12] = (pi_prot_type - 1) << 1 | 0x1; |
| } |
| |
| if (dev->transport->get_lbppbe) |
| buf[13] = dev->transport->get_lbppbe(dev) & 0x0f; |
| |
| if (dev->transport->get_alignment_offset_lbas) { |
| u16 lalba = dev->transport->get_alignment_offset_lbas(dev); |
| buf[14] = (lalba >> 8) & 0x3f; |
| buf[15] = lalba & 0xff; |
| } |
| |
| /* |
| * Set Thin Provisioning Enable bit following sbc3r22 in section |
| * READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled. |
| */ |
| if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws) { |
| buf[14] |= 0x80; |
| |
| /* |
| * LBPRZ signifies that zeroes will be read back from an LBA after |
| * an UNMAP or WRITE SAME w/ unmap bit (sbc3r36 5.16.2) |
| */ |
| if (dev->dev_attrib.unmap_zeroes_data) |
| buf[14] |= 0x40; |
| } |
| |
| rbuf = transport_kmap_data_sg(cmd); |
| if (rbuf) { |
| memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); |
| transport_kunmap_data_sg(cmd); |
| } |
| |
| target_complete_cmd_with_length(cmd, GOOD, 32); |
| return 0; |
| } |
| |
| static sense_reason_t |
| sbc_emulate_startstop(struct se_cmd *cmd) |
| { |
| unsigned char *cdb = cmd->t_task_cdb; |
| |
| /* |
| * See sbc3r36 section 5.25 |
| * Immediate bit should be set since there is nothing to complete |
| * POWER CONDITION MODIFIER 0h |
| */ |
| if (!(cdb[1] & 1) || cdb[2] || cdb[3]) |
| return TCM_INVALID_CDB_FIELD; |
| |
| /* |
| * See sbc3r36 section 5.25 |
| * POWER CONDITION 0h START_VALID - process START and LOEJ |
| */ |
| if (cdb[4] >> 4 & 0xf) |
| return TCM_INVALID_CDB_FIELD; |
| |
| /* |
| * See sbc3r36 section 5.25 |
| * LOEJ 0h - nothing to load or unload |
| * START 1h - we are ready |
| */ |
| if (!(cdb[4] & 1) || (cdb[4] & 2) || (cdb[4] & 4)) |
| return TCM_INVALID_CDB_FIELD; |
| |
| target_complete_cmd(cmd, SAM_STAT_GOOD); |
| return 0; |
| } |
| |
| sector_t sbc_get_write_same_sectors(struct se_cmd *cmd) |
| { |
| u32 num_blocks; |
| |
| if (cmd->t_task_cdb[0] == WRITE_SAME) |
| num_blocks = get_unaligned_be16(&cmd->t_task_cdb[7]); |
| else if (cmd->t_task_cdb[0] == WRITE_SAME_16) |
| num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]); |
| else /* WRITE_SAME_32 via VARIABLE_LENGTH_CMD */ |
| num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]); |
| |
| /* |
| * Use the explicit range when non zero is supplied, otherwise calculate |
| * the remaining range based on ->get_blocks() - starting LBA. |
| */ |
| if (num_blocks) |
| return num_blocks; |
| |
| return cmd->se_dev->transport->get_blocks(cmd->se_dev) - |
| cmd->t_task_lba + 1; |
| } |
| EXPORT_SYMBOL(sbc_get_write_same_sectors); |
| |
| static sense_reason_t |
| sbc_execute_write_same_unmap(struct se_cmd *cmd) |
| { |
| struct sbc_ops *ops = cmd->protocol_data; |
| sector_t nolb = sbc_get_write_same_sectors(cmd); |
| sense_reason_t ret; |
| |
| if (nolb) { |
| ret = ops->execute_unmap(cmd, cmd->t_task_lba, nolb); |
| if (ret) |
| return ret; |
| } |
| |
| target_complete_cmd(cmd, GOOD); |
| return 0; |
| } |
| |
| static sense_reason_t |
| sbc_emulate_noop(struct se_cmd *cmd) |
| { |
| target_complete_cmd(cmd, GOOD); |
| return 0; |
| } |
| |
| static inline u32 sbc_get_size(struct se_cmd *cmd, u32 sectors) |
| { |
| return cmd->se_dev->dev_attrib.block_size * sectors; |
| } |
| |
| static inline u32 transport_get_sectors_6(unsigned char *cdb) |
| { |
| /* |
| * Use 8-bit sector value. SBC-3 says: |
| * |
| * A TRANSFER LENGTH field set to zero specifies that 256 |
| * logical blocks shall be written. Any other value |
| * specifies the number of logical blocks that shall be |
| * written. |
| */ |
| return cdb[4] ? : 256; |
| } |
| |
| static inline u32 transport_get_sectors_10(unsigned char *cdb) |
| { |
| return (u32)(cdb[7] << 8) + cdb[8]; |
| } |
| |
| static inline u32 transport_get_sectors_12(unsigned char *cdb) |
| { |
| return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9]; |
| } |
| |
| static inline u32 transport_get_sectors_16(unsigned char *cdb) |
| { |
| return (u32)(cdb[10] << 24) + (cdb[11] << 16) + |
| (cdb[12] << 8) + cdb[13]; |
| } |
| |
| /* |
| * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants |
| */ |
| static inline u32 transport_get_sectors_32(unsigned char *cdb) |
| { |
| return (u32)(cdb[28] << 24) + (cdb[29] << 16) + |
| (cdb[30] << 8) + cdb[31]; |
| |
| } |
| |
| static inline u32 transport_lba_21(unsigned char *cdb) |
| { |
| return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3]; |
| } |
| |
| static inline u32 transport_lba_32(unsigned char *cdb) |
| { |
| return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; |
| } |
| |
| static inline unsigned long long transport_lba_64(unsigned char *cdb) |
| { |
| unsigned int __v1, __v2; |
| |
| __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; |
| __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; |
| |
| return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; |
| } |
| |
| /* |
| * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs |
| */ |
| static inline unsigned long long transport_lba_64_ext(unsigned char *cdb) |
| { |
| unsigned int __v1, __v2; |
| |
| __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15]; |
| __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19]; |
| |
| return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; |
| } |
| |
| static sense_reason_t |
| sbc_setup_write_same(struct se_cmd *cmd, unsigned char *flags, struct sbc_ops *ops) |
| { |
| struct se_device *dev = cmd->se_dev; |
| sector_t end_lba = dev->transport->get_blocks(dev) + 1; |
| unsigned int sectors = sbc_get_write_same_sectors(cmd); |
| sense_reason_t ret; |
| |
| if ((flags[0] & 0x04) || (flags[0] & 0x02)) { |
| pr_err("WRITE_SAME PBDATA and LBDATA" |
| " bits not supported for Block Discard" |
| " Emulation\n"); |
| return TCM_UNSUPPORTED_SCSI_OPCODE; |
| } |
| if (sectors > cmd->se_dev->dev_attrib.max_write_same_len) { |
| pr_warn("WRITE_SAME sectors: %u exceeds max_write_same_len: %u\n", |
| sectors, cmd->se_dev->dev_attrib.max_write_same_len); |
| return TCM_INVALID_CDB_FIELD; |
| } |
| /* |
| * Sanity check for LBA wrap and request past end of device. |
| */ |
| if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) || |
| ((cmd->t_task_lba + sectors) > end_lba)) { |
| pr_err("WRITE_SAME exceeds last lba %llu (lba %llu, sectors %u)\n", |
| (unsigned long long)end_lba, cmd->t_task_lba, sectors); |
| return TCM_ADDRESS_OUT_OF_RANGE; |
| } |
| |
| /* We always have ANC_SUP == 0 so setting ANCHOR is always an error */ |
| if (flags[0] & 0x10) { |
| pr_warn("WRITE SAME with ANCHOR not supported\n"); |
| return TCM_INVALID_CDB_FIELD; |
| } |
| /* |
| * Special case for WRITE_SAME w/ UNMAP=1 that ends up getting |
| * translated into block discard requests within backend code. |
| */ |
| if (flags[0] & 0x08) { |
| if (!ops->execute_unmap) |
| return TCM_UNSUPPORTED_SCSI_OPCODE; |
| |
| if (!dev->dev_attrib.emulate_tpws) { |
| pr_err("Got WRITE_SAME w/ UNMAP=1, but backend device" |
| " has emulate_tpws disabled\n"); |
| return TCM_UNSUPPORTED_SCSI_OPCODE; |
| } |
| cmd->execute_cmd = sbc_execute_write_same_unmap; |
| return 0; |
| } |
| if (!ops->execute_write_same) |
| return TCM_UNSUPPORTED_SCSI_OPCODE; |
| |
| ret = sbc_check_prot(dev, cmd, &cmd->t_task_cdb[0], sectors, true); |
| if (ret) |
| return ret; |
| |
| cmd->execute_cmd = ops->execute_write_same; |
| return 0; |
| } |
| |
| static sense_reason_t xdreadwrite_callback(struct se_cmd *cmd, bool success, |
| int *post_ret) |
| { |
| unsigned char *buf, *addr; |
| struct scatterlist *sg; |
| unsigned int offset; |
| sense_reason_t ret = TCM_NO_SENSE; |
| int i, count; |
| /* |
| * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command |
| * |
| * 1) read the specified logical block(s); |
| * 2) transfer logical blocks from the data-out buffer; |
| * 3) XOR the logical blocks transferred from the data-out buffer with |
| * the logical blocks read, storing the resulting XOR data in a buffer; |
| * 4) if the DISABLE WRITE bit is set to zero, then write the logical |
| * blocks transferred from the data-out buffer; and |
| * 5) transfer the resulting XOR data to the data-in buffer. |
| */ |
| buf = kmalloc(cmd->data_length, GFP_KERNEL); |
| if (!buf) { |
| pr_err("Unable to allocate xor_callback buf\n"); |
| return TCM_OUT_OF_RESOURCES; |
| } |
| /* |
| * Copy the scatterlist WRITE buffer located at cmd->t_data_sg |
| * into the locally allocated *buf |
| */ |
| sg_copy_to_buffer(cmd->t_data_sg, |
| cmd->t_data_nents, |
| buf, |
| cmd->data_length); |
| |
| /* |
| * Now perform the XOR against the BIDI read memory located at |
| * cmd->t_mem_bidi_list |
| */ |
| |
| offset = 0; |
| for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) { |
| addr = kmap_atomic(sg_page(sg)); |
| if (!addr) { |
| ret = TCM_OUT_OF_RESOURCES; |
| goto out; |
| } |
| |
| for (i = 0; i < sg->length; i++) |
| *(addr + sg->offset + i) ^= *(buf + offset + i); |
| |
| offset += sg->length; |
| kunmap_atomic(addr); |
| } |
| |
| out: |
| kfree(buf); |
| return ret; |
| } |
| |
| static sense_reason_t |
| sbc_execute_rw(struct se_cmd *cmd) |
| { |
| struct sbc_ops *ops = cmd->protocol_data; |
| |
| return ops->execute_rw(cmd, cmd->t_data_sg, cmd->t_data_nents, |
| cmd->data_direction); |
| } |
| |
| static sense_reason_t compare_and_write_post(struct se_cmd *cmd, bool success, |
| int *post_ret) |
| { |
| struct se_device *dev = cmd->se_dev; |
| |
| /* |
| * Only set SCF_COMPARE_AND_WRITE_POST to force a response fall-through |
| * within target_complete_ok_work() if the command was successfully |
| * sent to the backend driver. |
| */ |
| spin_lock_irq(&cmd->t_state_lock); |
| if ((cmd->transport_state & CMD_T_SENT) && !cmd->scsi_status) { |
| cmd->se_cmd_flags |= SCF_COMPARE_AND_WRITE_POST; |
| *post_ret = 1; |
| } |
| spin_unlock_irq(&cmd->t_state_lock); |
| |
| /* |
| * Unlock ->caw_sem originally obtained during sbc_compare_and_write() |
| * before the original READ I/O submission. |
| */ |
| up(&dev->caw_sem); |
| |
| return TCM_NO_SENSE; |
| } |
| |
| static sense_reason_t compare_and_write_callback(struct se_cmd *cmd, bool success, |
| int *post_ret) |
| { |
| struct se_device *dev = cmd->se_dev; |
| struct scatterlist *write_sg = NULL, *sg; |
| unsigned char *buf = NULL, *addr; |
| struct sg_mapping_iter m; |
| unsigned int offset = 0, len; |
| unsigned int nlbas = cmd->t_task_nolb; |
| unsigned int block_size = dev->dev_attrib.block_size; |
| unsigned int compare_len = (nlbas * block_size); |
| sense_reason_t ret = TCM_NO_SENSE; |
| int rc, 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_err("compare_and_write_callback: non zero scsi_status:" |
| " 0x%02x\n", cmd->scsi_status); |
| goto out; |
| } |
| |
| buf = kzalloc(cmd->data_length, GFP_KERNEL); |
| if (!buf) { |
| pr_err("Unable to allocate compare_and_write buf\n"); |
| ret = TCM_OUT_OF_RESOURCES; |
| goto out; |
| } |
| |
| write_sg = kmalloc(sizeof(struct scatterlist) * cmd->t_data_nents, |
| GFP_KERNEL); |
| if (!write_sg) { |
| pr_err("Unable to allocate compare_and_write sg\n"); |
| ret = TCM_OUT_OF_RESOURCES; |
| goto out; |
| } |
| sg_init_table(write_sg, cmd->t_data_nents); |
| /* |
| * Setup verify and write data payloads from total NumberLBAs. |
| */ |
| rc = sg_copy_to_buffer(cmd->t_data_sg, cmd->t_data_nents, buf, |
| cmd->data_length); |
| if (!rc) { |
| pr_err("sg_copy_to_buffer() failed for compare_and_write\n"); |
| ret = TCM_OUT_OF_RESOURCES; |
| goto out; |
| } |
| /* |
| * Compare against SCSI READ payload against verify payload |
| */ |
| for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, i) { |
| addr = (unsigned char *)kmap_atomic(sg_page(sg)); |
| if (!addr) { |
| ret = TCM_OUT_OF_RESOURCES; |
| goto out; |
| } |
| |
| len = min(sg->length, compare_len); |
| |
| if (memcmp(addr, buf + offset, len)) { |
| pr_warn("Detected MISCOMPARE for addr: %p buf: %p\n", |
| addr, buf + offset); |
| kunmap_atomic(addr); |
| goto miscompare; |
| } |
| kunmap_atomic(addr); |
| |
| offset += len; |
| compare_len -= len; |
| if (!compare_len) |
| break; |
| } |
| |
| i = 0; |
| len = cmd->t_task_nolb * block_size; |
| 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_BUSY|CMD_T_SENT; |
| spin_unlock_irq(&cmd->t_state_lock); |
| |
| __target_execute_cmd(cmd, false); |
| |
| kfree(buf); |
| return ret; |
| |
| miscompare: |
| pr_warn("Target/%s: Send MISCOMPARE check condition and sense\n", |
| dev->transport->name); |
| ret = TCM_MISCOMPARE_VERIFY; |
| 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); |
| kfree(write_sg); |
| kfree(buf); |
| 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: |
| 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: |
| 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 = (cdb[10] << 24) | (cdb[11] << 16) | |
| (cdb[12] << 8) | cdb[13]; |
| 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: |
| size = 0; |
| sectors = transport_get_sectors_10(cdb); |
| cmd->t_task_lba = transport_lba_32(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; |
| } |
| |
| 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, 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 == cpu_to_be16(0xffff)) { |
| 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->bad_sector = 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); |