static int target_xcopy_parse_tiddesc_e4(struct se_cmd *se_cmd, struct xcopy_op *xop,
				unsigned char *p, unsigned short cscd_index)
{
	unsigned char *desc = p;
	unsigned short ript;
	u8 desig_len;
	/*
	 * Extract RELATIVE INITIATOR PORT IDENTIFIER
	 */
	ript = get_unaligned_be16(&desc[2]);
	pr_debug("XCOPY 0xe4: RELATIVE INITIATOR PORT IDENTIFIER: %hu\n", ript);
	/*
	 * Check for supported code set, association, and designator type
	 */
	if ((desc[4] & 0x0f) != 0x1) {
		pr_err("XCOPY 0xe4: code set of non binary type not supported\n");
		return -EINVAL;
	}
	if ((desc[5] & 0x30) != 0x00) {
		pr_err("XCOPY 0xe4: association other than LUN not supported\n");
		return -EINVAL;
	}
	if ((desc[5] & 0x0f) != 0x3) {
		pr_err("XCOPY 0xe4: designator type unsupported: 0x%02x\n",
				(desc[5] & 0x0f));
		return -EINVAL;
	}
	/*
	 * Check for matching 16 byte length for NAA IEEE Registered Extended
	 * Assigned designator
	 */
	desig_len = desc[7];
	if (desig_len != XCOPY_NAA_IEEE_REGEX_LEN) {
		pr_err("XCOPY 0xe4: invalid desig_len: %d\n", (int)desig_len);
		return -EINVAL;
	}
	pr_debug("XCOPY 0xe4: desig_len: %d\n", (int)desig_len);
	/*
	 * Check for NAA IEEE Registered Extended Assigned header..
	 */
	if ((desc[8] & 0xf0) != 0x60) {
		pr_err("XCOPY 0xe4: Unsupported DESIGNATOR TYPE: 0x%02x\n",
					(desc[8] & 0xf0));
		return -EINVAL;
	}

	if (cscd_index != xop->stdi && cscd_index != xop->dtdi) {
		pr_debug("XCOPY 0xe4: ignoring CSCD entry %d - neither src nor "
			 "dest\n", cscd_index);
		return 0;
	}

	if (cscd_index == xop->stdi) {
		memcpy(&xop->src_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN);
		/*
		 * Determine if the source designator matches the local device
		 */
		if (!memcmp(&xop->local_dev_wwn[0], &xop->src_tid_wwn[0],
				XCOPY_NAA_IEEE_REGEX_LEN)) {
			xop->op_origin = XCOL_SOURCE_RECV_OP;
			xop->src_dev = se_cmd->se_dev;
			pr_debug("XCOPY 0xe4: Set xop->src_dev %p from source"
					" received xop\n", xop->src_dev);
		}
	}

	if (cscd_index == xop->dtdi) {
		memcpy(&xop->dst_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN);
		/*
		 * Determine if the destination designator matches the local
		 * device. If @cscd_index corresponds to both source (stdi) and
		 * destination (dtdi), or dtdi comes after stdi, then
		 * XCOL_DEST_RECV_OP wins.
		 */
		if (!memcmp(&xop->local_dev_wwn[0], &xop->dst_tid_wwn[0],
				XCOPY_NAA_IEEE_REGEX_LEN)) {
			xop->op_origin = XCOL_DEST_RECV_OP;
			xop->dst_dev = se_cmd->se_dev;
			pr_debug("XCOPY 0xe4: Set xop->dst_dev: %p from destination"
				" received xop\n", xop->dst_dev);
		}
	}

	return 0;
}
static int target_xcopy_parse_tiddesc_e4(struct se_cmd *se_cmd, struct xcopy_op *xop,
				unsigned char *p, unsigned short cscd_index)
{
	unsigned char *desc = p;
	unsigned short ript;
	u8 desig_len;
	 
	ript = get_unaligned_be16(&desc[2]);
	pr_debug("XCOPY 0xe4: RELATIVE INITIATOR PORT IDENTIFIER: %hu\n", ript);
	 
	if ((desc[4] & 0x0f) != 0x1) {
		pr_err("XCOPY 0xe4: code set of non binary type not supported\n");
		return -EINVAL;
	}
	if ((desc[5] & 0x30) != 0x00) {
		pr_err("XCOPY 0xe4: association other than LUN not supported\n");
		return -EINVAL;
	}
	if ((desc[5] & 0x0f) != 0x3) {
		pr_err("XCOPY 0xe4: designator type unsupported: 0x%02x\n",
				(desc[5] & 0x0f));
		return -EINVAL;
	}
	 
	desig_len = desc[7];
	if (desig_len != XCOPY_NAA_IEEE_REGEX_LEN) {
		pr_err("XCOPY 0xe4: invalid desig_len: %d\n", (int)desig_len);
		return -EINVAL;
	}
	pr_debug("XCOPY 0xe4: desig_len: %d\n", (int)desig_len);
	 
	if ((desc[8] & 0xf0) != 0x60) {
		pr_err("XCOPY 0xe4: Unsupported DESIGNATOR TYPE: 0x%02x\n",
					(desc[8] & 0xf0));
		return -EINVAL;
	}

	if (cscd_index != xop->stdi && cscd_index != xop->dtdi) {
		pr_debug("XCOPY 0xe4: ignoring CSCD entry %d - neither src nor "
			 "dest\n", cscd_index);
		return 0;
	}

	if (cscd_index == xop->stdi) {
		memcpy(&xop->src_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN);
		 
		if (!memcmp(&xop->local_dev_wwn[0], &xop->src_tid_wwn[0],
				XCOPY_NAA_IEEE_REGEX_LEN)) {
			xop->op_origin = XCOL_SOURCE_RECV_OP;
			xop->src_dev = se_cmd->se_dev;
			pr_debug("XCOPY 0xe4: Set xop->src_dev %p from source"
					" received xop\n", xop->src_dev);
		}
	}

	if (cscd_index == xop->dtdi) {
		memcpy(&xop->dst_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN);
		 
		if (!memcmp(&xop->local_dev_wwn[0], &xop->dst_tid_wwn[0],
				XCOPY_NAA_IEEE_REGEX_LEN)) {
			xop->op_origin = XCOL_DEST_RECV_OP;
			xop->dst_dev = se_cmd->se_dev;
			pr_debug("XCOPY 0xe4: Set xop->dst_dev: %p from destination"
				" received xop\n", xop->dst_dev);
		}
	}

	return 0;
}