Function mlx4_flow_item_check

dpdk/drivers/net/mlx4/mlx4_flow.c:529–573

* Perform basic sanity checks on a pattern item. * * @param[in] item * Item specification. * @param[in] proc * Associated item-processing object. * @param[out] error * Perform verbose error reporting if not NULL. * * @return * 0 on success, a negative errno value otherwise and rte_errno is set. */

 *   0 on success, a negative errno value otherwise and rte_errno is set.
 */
static int
mlx4_flow_item_check(const struct rte_flow_item *item,
		     const struct mlx4_flow_proc_item *proc,
		     struct rte_flow_error *error)
{
	const uint8_t *mask;
	unsigned int i;

	/* item->last and item->mask cannot exist without item->spec. */
	if (!item->spec && (item->mask || item->last))
		return rte_flow_error_set
			(error, EINVAL, RTE_FLOW_ERROR_TYPE_ITEM, item,
			 "\"mask\" or \"last\" field provided without a"
			 " corresponding \"spec\"");
	/* No spec, no mask, no problem. */
	if (!item->spec)
		return 0;
	mask = item->mask ?
		(const uint8_t *)item->mask :
		(const uint8_t *)proc->mask_default;
	MLX4_ASSERT(mask);
	/*
	 * Single-pass check to make sure that:
	 * - Mask is supported, no bits are set outside proc->mask_support.
	 * - Both item->spec and item->last are included in mask.
	 */
	for (i = 0; i != proc->mask_sz; ++i) {
		if (!mask[i])
			continue;
		if ((mask[i] | ((const uint8_t *)proc->mask_support)[i]) !=
		    ((const uint8_t *)proc->mask_support)[i])
			return rte_flow_error_set
				(error, ENOTSUP, RTE_FLOW_ERROR_TYPE_ITEM,
				 item, "unsupported field found in \"mask\"");
		if (item->last &&
		    (((const uint8_t *)item->spec)[i] & mask[i]) !=
		    (((const uint8_t *)item->last)[i] & mask[i]))
			return rte_flow_error_set
				(error, ENOTSUP, RTE_FLOW_ERROR_TYPE_ITEM,
				 item,
				 "range between \"spec\" and \"last\""
				 " is larger than \"mask\"");
	}
	return 0;
}

/** Graph of supported items and associated actions. */
static const struct mlx4_flow_proc_item mlx4_flow_proc_item_list[] = {