/*
* Returns TCM_NO_SENSE upon success or a sense code != TCM_NO_SENSE if parsing
* fails.
*/
static sense_reason_t target_parse_xcopy_cmd(struct xcopy_op *xop)
{
struct se_cmd *se_cmd = xop->xop_se_cmd;
unsigned char *p = NULL, *seg_desc;
unsigned int list_id, list_id_usage, sdll, inline_dl;
sense_reason_t ret = TCM_INVALID_PARAMETER_LIST;
int rc;
unsigned short tdll;
p = transport_kmap_data_sg(se_cmd);
if (!p) {
pr_err("transport_kmap_data_sg() failed in target_do_xcopy\n");
return TCM_OUT_OF_RESOURCES;
}
list_id = p[0];
list_id_usage = (p[1] & 0x18) >> 3;
/*
* Determine TARGET DESCRIPTOR LIST LENGTH + SEGMENT DESCRIPTOR LIST LENGTH
*/
tdll = get_unaligned_be16(&p[2]);
sdll = get_unaligned_be32(&p[8]);
if (tdll + sdll > RCR_OP_MAX_DESC_LIST_LEN) {
pr_err("XCOPY descriptor list length %u exceeds maximum %u\n",
tdll + sdll, RCR_OP_MAX_DESC_LIST_LEN);
ret = TCM_PARAMETER_LIST_LENGTH_ERROR;
goto out;
}
inline_dl = get_unaligned_be32(&p[12]);
if (inline_dl != 0) {
pr_err("XCOPY with non zero inline data length\n");
goto out;
}
if (se_cmd->data_length < (XCOPY_HDR_LEN + tdll + sdll + inline_dl)) {
pr_err("XCOPY parameter truncation: data length %u too small "
"for tdll: %hu sdll: %u inline_dl: %u\n",
se_cmd->data_length, tdll, sdll, inline_dl);
ret = TCM_PARAMETER_LIST_LENGTH_ERROR;
goto out;
}
pr_debug("Processing XCOPY with list_id: 0x%02x list_id_usage: 0x%02x"
" tdll: %hu sdll: %u inline_dl: %u\n", list_id, list_id_usage,
tdll, sdll, inline_dl);
/*
* skip over the target descriptors until segment descriptors
* have been passed - CSCD ids are needed to determine src and dest.
*/
seg_desc = &p[16] + tdll;
rc = target_xcopy_parse_segment_descriptors(se_cmd, xop, seg_desc,
sdll, &ret);
if (rc <= 0)
goto out;
pr_debug("XCOPY: Processed %d segment descriptors, length: %u\n", rc,
rc * XCOPY_SEGMENT_DESC_LEN);
rc = target_xcopy_parse_target_descriptors(se_cmd, xop, &p[16], tdll, &ret);
if (rc <= 0)
goto out;
if (xop->src_dev->dev_attrib.block_size !=
xop->dst_dev->dev_attrib.block_size) {
pr_err("XCOPY: Non matching src_dev block_size: %u + dst_dev"
" block_size: %u currently unsupported\n",
xop->src_dev->dev_attrib.block_size,
xop->dst_dev->dev_attrib.block_size);
xcopy_pt_undepend_remotedev(xop);
ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
goto out;
}
pr_debug("XCOPY: Processed %d target descriptors, length: %u\n", rc,
rc * XCOPY_TARGET_DESC_LEN);
transport_kunmap_data_sg(se_cmd);
return TCM_NO_SENSE;
out:
if (p)
transport_kunmap_data_sg(se_cmd);
return ret;
}
static int iblock_execute_unmap(struct se_cmd *cmd)
{
struct se_device *dev = cmd->se_dev;
struct iblock_dev *ibd = dev->dev_ptr;
unsigned char *buf, *ptr = NULL;
sector_t lba;
int size;
u32 range;
int ret = 0;
int dl, bd_dl;
if (cmd->data_length < 8) {
pr_warn("UNMAP parameter list length %u too small\n",
cmd->data_length);
cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
return -EINVAL;
}
buf = transport_kmap_data_sg(cmd);
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->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count) {
cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
ret = -EINVAL;
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->se_sub_dev->se_dev_attrib.max_unmap_lba_count) {
cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
ret = -EINVAL;
goto err;
}
if (lba + range > dev->transport->get_blocks(dev) + 1) {
cmd->scsi_sense_reason = TCM_ADDRESS_OUT_OF_RANGE;
ret = -EINVAL;
goto err;
}
ret = blkdev_issue_discard(ibd->ibd_bd, lba, range,
GFP_KERNEL, 0);
if (ret < 0) {
pr_err("blkdev_issue_discard() failed: %d\n",
ret);
goto err;
}
ptr += 16;
size -= 16;
}
err:
transport_kunmap_data_sg(cmd);
if (!ret)
target_complete_cmd(cmd, GOOD);
return ret;
}
static sense_reason_t target_rcr_operating_parameters(struct se_cmd *se_cmd)
{
unsigned char *p;
p = transport_kmap_data_sg(se_cmd);
if (!p) {
pr_err("transport_kmap_data_sg failed in"
" target_rcr_operating_parameters\n");
return TCM_OUT_OF_RESOURCES;
}
if (se_cmd->data_length < 54) {
pr_err("Receive Copy Results Op Parameters length"
" too small: %u\n", se_cmd->data_length);
transport_kunmap_data_sg(se_cmd);
return TCM_INVALID_CDB_FIELD;
}
/*
* Set SNLID=1 (Supports no List ID)
*/
p[4] = 0x1;
/*
* MAXIMUM TARGET DESCRIPTOR COUNT
*/
put_unaligned_be16(RCR_OP_MAX_TARGET_DESC_COUNT, &p[8]);
/*
* MAXIMUM SEGMENT DESCRIPTOR COUNT
*/
put_unaligned_be16(RCR_OP_MAX_SG_DESC_COUNT, &p[10]);
/*
* MAXIMUM DESCRIPTOR LIST LENGTH
*/
put_unaligned_be32(RCR_OP_MAX_DESC_LIST_LEN, &p[12]);
/*
* MAXIMUM SEGMENT LENGTH
*/
put_unaligned_be32(RCR_OP_MAX_SEGMENT_LEN, &p[16]);
/*
* MAXIMUM INLINE DATA LENGTH for SA 0x04 (NOT SUPPORTED)
*/
put_unaligned_be32(0x0, &p[20]);
/*
* HELD DATA LIMIT
*/
put_unaligned_be32(0x0, &p[24]);
/*
* MAXIMUM STREAM DEVICE TRANSFER SIZE
*/
put_unaligned_be32(0x0, &p[28]);
/*
* TOTAL CONCURRENT COPIES
*/
put_unaligned_be16(RCR_OP_TOTAL_CONCURR_COPIES, &p[34]);
/*
* MAXIMUM CONCURRENT COPIES
*/
p[36] = RCR_OP_MAX_CONCURR_COPIES;
/*
* DATA SEGMENT GRANULARITY (log 2)
*/
p[37] = RCR_OP_DATA_SEG_GRAN_LOG2;
/*
* INLINE DATA GRANULARITY log 2)
*/
p[38] = RCR_OP_INLINE_DATA_GRAN_LOG2;
/*
* HELD DATA GRANULARITY
*/
p[39] = RCR_OP_HELD_DATA_GRAN_LOG2;
/*
* IMPLEMENTED DESCRIPTOR LIST LENGTH
*/
p[43] = 0x2;
/*
* List of implemented descriptor type codes (ordered)
*/
p[44] = 0x02; /* Copy Block to Block device */
p[45] = 0xe4; /* Identification descriptor target descriptor */
/*
* AVAILABLE DATA (n-3)
*/
put_unaligned_be32(42, &p[0]);
transport_kunmap_data_sg(se_cmd);
target_complete_cmd(se_cmd, GOOD);
return TCM_NO_SENSE;
}
