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path: root/drivers/target/target_core_sbc.c
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Diffstat (limited to 'drivers/target/target_core_sbc.c')
-rw-r--r--drivers/target/target_core_sbc.c252
1 files changed, 251 insertions, 1 deletions
diff --git a/drivers/target/target_core_sbc.c b/drivers/target/target_core_sbc.c
index 52ae54e60105..fa3cae393e13 100644
--- a/drivers/target/target_core_sbc.c
+++ b/drivers/target/target_core_sbc.c
@@ -23,6 +23,7 @@
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/ratelimit.h>
+#include <linux/crc-t10dif.h>
#include <asm/unaligned.h>
#include <scsi/scsi.h>
#include <scsi/scsi_tcq.h>
@@ -33,7 +34,7 @@
#include "target_core_internal.h"
#include "target_core_ua.h"
-
+#include "target_core_alua.h"
static sense_reason_t
sbc_emulate_readcapacity(struct se_cmd *cmd)
@@ -105,6 +106,11 @@ sbc_emulate_readcapacity_16(struct se_cmd *cmd)
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 (dev->dev_attrib.pi_prot_type)
+ buf[12] = (dev->dev_attrib.pi_prot_type - 1) << 1 | 0x1;
if (dev->transport->get_lbppbe)
buf[13] = dev->transport->get_lbppbe(dev) & 0x0f;
@@ -563,6 +569,44 @@ sbc_compare_and_write(struct se_cmd *cmd)
return TCM_NO_SENSE;
}
+static bool
+sbc_check_prot(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb,
+ u32 sectors)
+{
+ if (!cmd->t_prot_sg || !cmd->t_prot_nents)
+ return true;
+
+ switch (dev->dev_attrib.pi_prot_type) {
+ case TARGET_DIF_TYPE3_PROT:
+ if (!(cdb[1] & 0xe0))
+ return true;
+
+ cmd->reftag_seed = 0xffffffff;
+ break;
+ case TARGET_DIF_TYPE2_PROT:
+ if (cdb[1] & 0xe0)
+ return false;
+
+ cmd->reftag_seed = cmd->t_task_lba;
+ break;
+ case TARGET_DIF_TYPE1_PROT:
+ if (!(cdb[1] & 0xe0))
+ return true;
+
+ cmd->reftag_seed = cmd->t_task_lba;
+ break;
+ case TARGET_DIF_TYPE0_PROT:
+ default:
+ return true;
+ }
+
+ cmd->prot_type = dev->dev_attrib.pi_prot_type;
+ cmd->prot_length = dev->prot_length * sectors;
+ cmd->prot_handover = PROT_SEPERATED;
+
+ return true;
+}
+
sense_reason_t
sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops)
{
@@ -583,6 +627,10 @@ sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops)
case READ_10:
sectors = transport_get_sectors_10(cdb);
cmd->t_task_lba = transport_lba_32(cdb);
+
+ if (!sbc_check_prot(dev, cmd, cdb, sectors))
+ return TCM_UNSUPPORTED_SCSI_OPCODE;
+
cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
cmd->execute_rw = ops->execute_rw;
cmd->execute_cmd = sbc_execute_rw;
@@ -590,6 +638,10 @@ sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops)
case READ_12:
sectors = transport_get_sectors_12(cdb);
cmd->t_task_lba = transport_lba_32(cdb);
+
+ if (!sbc_check_prot(dev, cmd, cdb, sectors))
+ return TCM_UNSUPPORTED_SCSI_OPCODE;
+
cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
cmd->execute_rw = ops->execute_rw;
cmd->execute_cmd = sbc_execute_rw;
@@ -597,6 +649,10 @@ sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops)
case READ_16:
sectors = transport_get_sectors_16(cdb);
cmd->t_task_lba = transport_lba_64(cdb);
+
+ if (!sbc_check_prot(dev, cmd, cdb, sectors))
+ return TCM_UNSUPPORTED_SCSI_OPCODE;
+
cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
cmd->execute_rw = ops->execute_rw;
cmd->execute_cmd = sbc_execute_rw;
@@ -612,6 +668,10 @@ sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops)
case WRITE_VERIFY:
sectors = transport_get_sectors_10(cdb);
cmd->t_task_lba = transport_lba_32(cdb);
+
+ if (!sbc_check_prot(dev, cmd, cdb, sectors))
+ return TCM_UNSUPPORTED_SCSI_OPCODE;
+
if (cdb[1] & 0x8)
cmd->se_cmd_flags |= SCF_FUA;
cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
@@ -621,6 +681,10 @@ sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops)
case WRITE_12:
sectors = transport_get_sectors_12(cdb);
cmd->t_task_lba = transport_lba_32(cdb);
+
+ if (!sbc_check_prot(dev, cmd, cdb, sectors))
+ return TCM_UNSUPPORTED_SCSI_OPCODE;
+
if (cdb[1] & 0x8)
cmd->se_cmd_flags |= SCF_FUA;
cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
@@ -630,6 +694,10 @@ sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops)
case WRITE_16:
sectors = transport_get_sectors_16(cdb);
cmd->t_task_lba = transport_lba_64(cdb);
+
+ if (!sbc_check_prot(dev, cmd, cdb, sectors))
+ return TCM_UNSUPPORTED_SCSI_OPCODE;
+
if (cdb[1] & 0x8)
cmd->se_cmd_flags |= SCF_FUA;
cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
@@ -731,6 +799,9 @@ sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops)
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);
@@ -959,3 +1030,182 @@ err:
return ret;
}
EXPORT_SYMBOL(sbc_execute_unmap);
+
+static sense_reason_t
+sbc_dif_v1_verify(struct se_device *dev, struct se_dif_v1_tuple *sdt,
+ const void *p, sector_t sector, unsigned int ei_lba)
+{
+ int block_size = dev->dev_attrib.block_size;
+ __be16 csum;
+
+ csum = cpu_to_be16(crc_t10dif(p, block_size));
+
+ 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;
+ }
+
+ if (dev->dev_attrib.pi_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 (dev->dev_attrib.pi_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;
+}
+
+static 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;
+
+ left = sectors * dev->prot_length;
+
+ for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) {
+
+ len = min(psg->length, left);
+ paddr = kmap_atomic(sg_page(psg)) + psg->offset;
+ addr = kmap_atomic(sg_page(sg)) + sg_off;
+
+ if (read)
+ memcpy(paddr, addr, len);
+ else
+ memcpy(addr, paddr, len);
+
+ left -= len;
+ kunmap_atomic(paddr);
+ kunmap_atomic(addr);
+ }
+}
+
+sense_reason_t
+sbc_dif_verify_write(struct se_cmd *cmd, sector_t start, unsigned int sectors,
+ unsigned int ei_lba, struct scatterlist *sg, int sg_off)
+{
+ struct se_device *dev = cmd->se_dev;
+ struct se_dif_v1_tuple *sdt;
+ struct scatterlist *dsg, *psg = cmd->t_prot_sg;
+ sector_t sector = start;
+ void *daddr, *paddr;
+ int i, j, offset = 0;
+ sense_reason_t rc;
+
+ for_each_sg(cmd->t_data_sg, dsg, cmd->t_data_nents, i) {
+ daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
+ paddr = kmap_atomic(sg_page(psg)) + psg->offset;
+
+ for (j = 0; j < dsg->length; j += dev->dev_attrib.block_size) {
+
+ if (offset >= psg->length) {
+ kunmap_atomic(paddr);
+ psg = sg_next(psg);
+ paddr = kmap_atomic(sg_page(psg)) + psg->offset;
+ offset = 0;
+ }
+
+ sdt = paddr + offset;
+
+ pr_debug("DIF WRITE 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));
+
+ rc = sbc_dif_v1_verify(dev, sdt, daddr + j, sector,
+ ei_lba);
+ if (rc) {
+ kunmap_atomic(paddr);
+ kunmap_atomic(daddr);
+ cmd->bad_sector = sector;
+ return rc;
+ }
+
+ sector++;
+ ei_lba++;
+ offset += sizeof(struct se_dif_v1_tuple);
+ }
+
+ kunmap_atomic(paddr);
+ kunmap_atomic(daddr);
+ }
+ sbc_dif_copy_prot(cmd, sectors, false, sg, sg_off);
+
+ return 0;
+}
+EXPORT_SYMBOL(sbc_dif_verify_write);
+
+sense_reason_t
+sbc_dif_verify_read(struct se_cmd *cmd, sector_t start, unsigned int sectors,
+ unsigned int ei_lba, struct scatterlist *sg, int sg_off)
+{
+ struct se_device *dev = cmd->se_dev;
+ struct se_dif_v1_tuple *sdt;
+ struct scatterlist *dsg;
+ sector_t sector = start;
+ void *daddr, *paddr;
+ int i, j, offset = sg_off;
+ sense_reason_t rc;
+
+ for_each_sg(cmd->t_data_sg, dsg, cmd->t_data_nents, i) {
+ daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
+ paddr = kmap_atomic(sg_page(sg)) + sg->offset;
+
+ for (j = 0; j < dsg->length; j += dev->dev_attrib.block_size) {
+
+ if (offset >= sg->length) {
+ kunmap_atomic(paddr);
+ sg = sg_next(sg);
+ paddr = kmap_atomic(sg_page(sg)) + sg->offset;
+ offset = 0;
+ }
+
+ sdt = paddr + offset;
+
+ 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)) {
+ sector++;
+ offset += sizeof(struct se_dif_v1_tuple);
+ continue;
+ }
+
+ rc = sbc_dif_v1_verify(dev, sdt, daddr + j, sector,
+ ei_lba);
+ if (rc) {
+ kunmap_atomic(paddr);
+ kunmap_atomic(daddr);
+ cmd->bad_sector = sector;
+ return rc;
+ }
+
+ sector++;
+ ei_lba++;
+ offset += sizeof(struct se_dif_v1_tuple);
+ }
+
+ kunmap_atomic(paddr);
+ kunmap_atomic(daddr);
+ }
+ sbc_dif_copy_prot(cmd, sectors, true, sg, sg_off);
+
+ return 0;
+}
+EXPORT_SYMBOL(sbc_dif_verify_read);
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-26 23:05:10 +0000