target: Convert DIF emulation to use cmd->prot_type

This patch changes existing DIF emulation to check the command descriptor's
prot_type, instead of what the backend device is exposing in pi_prot_type.

Since this value is already set in sbc_check_prot(), go ahead and use it to
allow protected fabrics to function with unprotected devices.

Reviewed-by: Martin Petersen <martin.petersen@oracle.com>
Reviewed-by: Sagi Grimberg <sagig@mellanox.com>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

1 files changed, 7 insertions, 6 deletions

diff --git a/drivers/target/target_core_sbc.c b/drivers/target/target_core_sbc.c
index 9a2f9d3a6e70..95a7a7444965 100644
--- a/drivers/target/target_core_sbc.c
+++ b/drivers/target/target_core_sbc.c
@@ -1167,7 +1167,7 @@ sbc_dif_generate(struct se_cmd *cmd)
                         sdt = paddr + offset;
                         sdt->guard_tag = cpu_to_be16(crc_t10dif(daddr + j,
                                                 dev->dev_attrib.block_size));
-                        if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE1_PROT)
+                        if (cmd->prot_type == TARGET_DIF_TYPE1_PROT)
                                 sdt->ref_tag = cpu_to_be32(sector & 0xffffffff);
                         sdt->app_tag = 0;
 
@@ -1186,9 +1186,10 @@ sbc_dif_generate(struct se_cmd *cmd)
 }
 
 static sense_reason_t
-sbc_dif_v1_verify(struct se_device *dev, struct se_dif_v1_tuple *sdt,
+sbc_dif_v1_verify(struct se_cmd *cmd, struct se_dif_v1_tuple *sdt,
                   const void *p, sector_t sector, unsigned int ei_lba)
 {
+        struct se_device *dev = cmd->se_dev;
         int block_size = dev->dev_attrib.block_size;
         __be16 csum;
 
@@ -1201,7 +1202,7 @@ sbc_dif_v1_verify(struct se_device *dev, struct se_dif_v1_tuple *sdt,
                 return TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
         }
 
-        if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE1_PROT &&
+        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,
@@ -1209,7 +1210,7 @@ sbc_dif_v1_verify(struct se_device *dev, struct se_dif_v1_tuple *sdt,
                 return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
         }
 
-        if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE2_PROT &&
+        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,
@@ -1293,7 +1294,7 @@ sbc_dif_verify_write(struct se_cmd *cmd, sector_t start, unsigned int sectors,
                                  (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,
+                        rc = sbc_dif_v1_verify(cmd, sdt, daddr + j, sector,
                                                ei_lba);
                         if (rc) {
                                 kunmap_atomic(paddr);
@@ -1354,7 +1355,7 @@ __sbc_dif_verify_read(struct se_cmd *cmd, sector_t start, unsigned int sectors,
                                 continue;
                         }
 
-                        rc = sbc_dif_v1_verify(dev, sdt, daddr + j, sector,
+                        rc = sbc_dif_v1_verify(cmd, sdt, daddr + j, sector,
                                                ei_lba);
                         if (rc) {
                                 kunmap_atomic(paddr);