--- zzzz-none-000/linux-3.10.107/drivers/target/target_core_sbc.c 2017-06-27 09:49:32.000000000 +0000 +++ scorpion-7490-727/linux-3.10.107/drivers/target/target_core_sbc.c 2021-02-04 17:41:59.000000000 +0000 @@ -1,7 +1,7 @@ /* * SCSI Block Commands (SBC) parsing and emulation. * - * (c) Copyright 2002-2012 RisingTide Systems LLC. + * (c) Copyright 2002-2013 Datera, Inc. * * Nicholas A. Bellinger * @@ -23,8 +23,10 @@ #include #include #include +#include #include -#include +#include +#include #include #include @@ -32,17 +34,37 @@ #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 @@ -71,6 +93,9 @@ 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); @@ -89,11 +114,35 @@ 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; + buf[14] |= 0x80; rbuf = transport_kmap_data_sg(cmd); if (rbuf) { @@ -105,6 +154,38 @@ 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; @@ -129,33 +210,32 @@ EXPORT_SYMBOL(sbc_get_write_same_sectors); static sense_reason_t -sbc_emulate_noop(struct se_cmd *cmd) +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 inline u32 sbc_get_size(struct se_cmd *cmd, u32 sectors) +static sense_reason_t +sbc_emulate_noop(struct se_cmd *cmd) { - return cmd->se_dev->dev_attrib.block_size * sectors; + target_complete_cmd(cmd, GOOD); + return 0; } -static int sbc_check_valid_sectors(struct se_cmd *cmd) +static inline u32 sbc_get_size(struct se_cmd *cmd, u32 sectors) { - struct se_device *dev = cmd->se_dev; - unsigned long long end_lba; - u32 sectors; - - sectors = cmd->data_length / dev->dev_attrib.block_size; - end_lba = dev->transport->get_blocks(dev) + 1; - - if (cmd->t_task_lba + sectors > end_lba) { - pr_err("target: lba %llu, sectors %u exceeds end lba %llu\n", - cmd->t_task_lba, sectors, end_lba); - return -EINVAL; - } - - return 0; + return cmd->se_dev->dev_attrib.block_size * sectors; } static inline u32 transport_get_sectors_6(unsigned char *cdb) @@ -233,7 +313,10 @@ 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" @@ -247,30 +330,55 @@ 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_write_same_unmap) + if (!ops->execute_unmap) return TCM_UNSUPPORTED_SCSI_OPCODE; - cmd->execute_cmd = ops->execute_write_same_unmap; + 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 void xdreadwrite_callback(struct se_cmd *cmd) +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; - int i; - int count; + sense_reason_t ret = TCM_NO_SENSE; + int i, count; /* * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command * @@ -285,7 +393,7 @@ buf = kmalloc(cmd->data_length, GFP_KERNEL); if (!buf) { pr_err("Unable to allocate xor_callback buf\n"); - return; + return TCM_OUT_OF_RESOURCES; } /* * Copy the scatterlist WRITE buffer located at cmd->t_data_sg @@ -304,8 +412,10 @@ 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) + if (!addr) { + ret = TCM_OUT_OF_RESOURCES; goto out; + } for (i = 0; i < sg->length; i++) *(addr + sg->offset + i) ^= *(buf + offset + i); @@ -316,6 +426,397 @@ 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; + sense_reason_t ret = TCM_NO_SENSE; + + /* + * 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->se_cmd_flags |= SCF_COMPARE_AND_WRITE_POST; + *post_ret = 1; + + if (cmd->scsi_status == SAM_STAT_CHECK_CONDITION) + ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; + } + 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 ret; +} + +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 @@ -327,61 +828,105 @@ 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 = ops->execute_rw; + 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 = ops->execute_rw; + 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 = ops->execute_rw; + 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 = ops->execute_rw; + 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 = ops->execute_rw; + 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 (cdb[1] & 0x8) - cmd->se_cmd_flags |= SCF_FUA; + + 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 = ops->execute_rw; + 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 (cdb[1] & 0x8) - cmd->se_cmd_flags |= SCF_FUA; + + 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 = ops->execute_rw; + 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 (cdb[1] & 0x8) - cmd->se_cmd_flags |= SCF_FUA; + + 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 = ops->execute_rw; + cmd->execute_cmd = sbc_execute_rw; break; case XDWRITEREAD_10: if (cmd->data_direction != DMA_TO_DEVICE || @@ -389,16 +934,17 @@ 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 = ops->execute_rw; + cmd->execute_cmd = sbc_execute_rw; cmd->transport_complete_callback = &xdreadwrite_callback; - if (cdb[1] & 0x8) - cmd->se_cmd_flags |= SCF_FUA; break; case VARIABLE_LENGTH_CMD: { @@ -407,6 +953,8 @@ 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. @@ -418,10 +966,8 @@ * Setup BIDI XOR callback to be run during after I/O * completion. */ - cmd->execute_cmd = ops->execute_rw; + cmd->execute_cmd = sbc_execute_rw; cmd->transport_complete_callback = &xdreadwrite_callback; - if (cdb[1] & 0x8) - cmd->se_cmd_flags |= SCF_FUA; break; case WRITE_SAME_32: sectors = transport_get_sectors_32(cdb); @@ -445,15 +991,42 @@ } 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: + 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); @@ -464,15 +1037,6 @@ break; case SYNCHRONIZE_CACHE: case SYNCHRONIZE_CACHE_16: - if (!ops->execute_sync_cache) { - size = 0; - cmd->execute_cmd = sbc_emulate_noop; - break; - } - - /* - * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE - */ if (cdb[0] == SYNCHRONIZE_CACHE) { sectors = transport_get_sectors_10(cdb); cmd->t_task_lba = transport_lba_32(cdb); @@ -480,25 +1044,24 @@ sectors = transport_get_sectors_16(cdb); cmd->t_task_lba = transport_lba_64(cdb); } - - size = sbc_get_size(cmd, sectors); - - /* - * Check to ensure that LBA + Range does not exceed past end of - * device for IBLOCK and FILEIO ->do_sync_cache() backend calls - */ - if (cmd->t_task_lba || sectors) { - if (sbc_check_valid_sectors(cmd) < 0) - return TCM_ADDRESS_OUT_OF_RANGE; + if (ops->execute_sync_cache) { + cmd->execute_cmd = ops->execute_sync_cache; + goto check_lba; } - cmd->execute_cmd = ops->execute_sync_cache; + 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 = ops->execute_unmap; + cmd->execute_cmd = sbc_execute_unmap; break; case WRITE_SAME_16: sectors = transport_get_sectors_16(cdb); @@ -533,9 +1096,17 @@ 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; - break; + goto check_lba; case REZERO_UNIT: case SEEK_6: case SEEK_10: @@ -548,6 +1119,10 @@ 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) @@ -555,22 +1130,23 @@ } /* reject any command that we don't have a handler for */ - if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) && !cmd->execute_cmd) + 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_INVALID_CDB_FIELD; + return TCM_ADDRESS_OUT_OF_RANGE; } - size = sbc_get_size(cmd, sectors); + if (!(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) + size = sbc_get_size(cmd, sectors); } return target_cmd_size_check(cmd, size); @@ -583,12 +1159,10 @@ } EXPORT_SYMBOL(sbc_get_device_type); -sense_reason_t -sbc_execute_unmap(struct se_cmd *cmd, - sense_reason_t (*do_unmap_fn)(struct se_cmd *, void *, - sector_t, sector_t), - void *priv) +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; @@ -652,7 +1226,7 @@ goto err; } - ret = do_unmap_fn(cmd, priv, lba, range); + ret = ops->execute_unmap(cmd, lba, range); if (ret) goto err; @@ -666,4 +1240,241 @@ target_complete_cmd(cmd, GOOD); return ret; } -EXPORT_SYMBOL(sbc_execute_unmap); + +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);