[PATCH v2] ethdev: support duplicating only item mask

[Dariusz Sosnowski <dsosnowski@nvidia.com>]

Extend rte_flow_conv() to support working only on item's mask.
This allows drivers to get only the mask's size when working on pattern
templates and duplicate items having only the mask in a generic way.

Signed-off-by: Dariusz Sosnowski <dsosnowski@nvidia.com>
Acked-by: Ori Kam <orika@nvidia.com>
---
v2:
- Split series 32095 into separate ethdev and mlx5 series.
- Rebased on latest commit in next-net-main.
---
 lib/ethdev/rte_flow.c | 15 +++++++++++++--
 lib/ethdev/rte_flow.h | 12 ++++++++++++
 2 files changed, 25 insertions(+), 2 deletions(-)

diff --git a/lib/ethdev/rte_flow.c b/lib/ethdev/rte_flow.c
index 7ab1100ea0..ca2f85c3fa 100644
--- a/lib/ethdev/rte_flow.c
+++ b/lib/ethdev/rte_flow.c
@@ -60,9 +60,10 @@ rte_flow_conv_copy(void *buf, const void *data, const size_t size,
 	bool rte_type = type >= 0;

 	size_t sz = rte_type ? desc[type].size : sizeof(void *);
-	if (buf == NULL || data == NULL)
+	if (data == NULL)
 		return 0;
-	rte_memcpy(buf, data, (size > sz ? sz : size));
+	if (buf != NULL)
+		rte_memcpy(buf, data, (size > sz ? sz : size));
 	if (rte_type && desc[type].desc_fn)
 		sz += desc[type].desc_fn(size > 0 ? buf : NULL, data);
 	return sz;
@@ -1090,6 +1091,7 @@ rte_flow_conv(enum rte_flow_conv_op op,

 	switch (op) {
 		const struct rte_flow_attr *attr;
+		const struct rte_flow_item *item;

 	case RTE_FLOW_CONV_OP_NONE:
 		ret = 0;
@@ -1104,6 +1106,15 @@ rte_flow_conv(enum rte_flow_conv_op op,
 	case RTE_FLOW_CONV_OP_ITEM:
 		ret = rte_flow_conv_pattern(dst, size, src, 1, error);
 		break;
+	case RTE_FLOW_CONV_OP_ITEM_MASK:
+		item = src;
+		if (item->mask == NULL) {
+			ret = rte_flow_error_set(error, EINVAL, RTE_FLOW_ERROR_TYPE_ITEM_MASK,
+						 item, "Mask not provided");
+			break;
+		}
+		ret = rte_flow_conv_item_spec(dst, size, src, RTE_FLOW_CONV_ITEM_MASK);
+		break;
 	case RTE_FLOW_CONV_OP_ACTION:
 		ret = rte_flow_conv_actions(dst, size, src, 1, error);
 		break;
diff --git a/lib/ethdev/rte_flow.h b/lib/ethdev/rte_flow.h
index fb84992b61..f864578f80 100644
--- a/lib/ethdev/rte_flow.h
+++ b/lib/ethdev/rte_flow.h
@@ -4426,6 +4426,18 @@ enum rte_flow_conv_op {
 	 */
 	RTE_FLOW_CONV_OP_ITEM,

+	/**
+	 * Convert a single item mask.
+	 *
+	 * Duplicates only @p mask.
+	 *
+	 * - @p src type:
+	 *   @code const struct rte_flow_item * @endcode
+	 * - @p dst type:
+	 *   @code struct rte_flow_item * @endcode
+	 */
+	RTE_FLOW_CONV_OP_ITEM_MASK,
+
 	/**
 	 * Convert a single action.
 	 *
--
2.39.2