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target/sbc: Add DIF setup in sbc_check_prot + sbc_parse_cdb

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This patch adds sbc_check_prot() for performing various DIF
related CDB sanity checks, along with setting cmd->prot_type
once sanity checks have passed.

Also, add calls in sbc_parse_cdb() for READ_[10,12,16] +
WRITE_[10,12,16] to perform DIF sanity checking.

v2 changes:
  - Make sbc_check_prot defined as static (Fengguang + Wei)
  - Remove unprotected READ/WRITE warning (mkp)
  - Populate cmd->prot_type + friends (Sagi)
  - Drop SCF_PROT usage

Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Sagi Grimberg <sagig@mellanox.com>
Cc: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Nicholas Bellinger 2013-12-23 20:30:03 +00:00
parent fcc4f17b9c
commit 499bf77b01
1 changed files with 62 additions and 0 deletions
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62
drivers/target/target_core_sbc.c
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@ -563,6 +563,44 @@ 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 +621,10 @@ 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 +632,10 @@ 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 +643,10 @@ 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 +662,10 @@ 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 +675,10 @@ 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 +688,10 @@ 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;