[dpdk-dev] [PATCH] net/mlx5: fix: flow validation

[Nelio Laranjeiro <nelio.laranjeiro@6wind.com>]

Item spec and last are wrongly compared to the NIC capability causing a
validation failure when the mask is null.
This validation function should only verify the user is not configuring
unsupported matching fields.

Fixes: 2097d0d1e2cc ("net/mlx5: support basic flow items and actions")
Cc: stable@dpdk.org

Signed-off-by: Nelio Laranjeiro <nelio.laranjeiro@6wind.com>
---
 drivers/net/mlx5/mlx5_flow.c | 73 +++++++++++-------------------------
 1 file changed, 22 insertions(+), 51 deletions(-)

diff --git a/drivers/net/mlx5/mlx5_flow.c b/drivers/net/mlx5/mlx5_flow.c
index 129311d50..5d4995783 100644
--- a/drivers/net/mlx5/mlx5_flow.c
+++ b/drivers/net/mlx5/mlx5_flow.c
@@ -555,60 +555,31 @@ static int
 mlx5_flow_item_validate(const struct rte_flow_item *item,
 			const uint8_t *mask, unsigned int size)
 {
-	if (!item->spec && (item->mask || item->last)) {
-		rte_errno = EINVAL;
-		return -rte_errno;
-	}
-	if (item->spec && !item->mask) {
-		unsigned int i;
-		const uint8_t *spec = item->spec;
-
-		for (i = 0; i < size; ++i)
-			if ((spec[i] | mask[i]) != mask[i]) {
-				rte_errno = EINVAL;
-				return -rte_errno;
-			}
-	}
-	if (item->last && !item->mask) {
-		unsigned int i;
-		const uint8_t *spec = item->last;
-
-		for (i = 0; i < size; ++i)
-			if ((spec[i] | mask[i]) != mask[i]) {
-				rte_errno = EINVAL;
-				return -rte_errno;
-			}
-	}
-	if (item->mask) {
-		unsigned int i;
-		const uint8_t *spec = item->spec;
-
-		for (i = 0; i < size; ++i)
-			if ((spec[i] | mask[i]) != mask[i]) {
-				rte_errno = EINVAL;
-				return -rte_errno;
-			}
-	}
-	if (item->spec && item->last) {
-		uint8_t spec[size];
-		uint8_t last[size];
-		const uint8_t *apply = mask;
-		unsigned int i;
-		int ret;
+	unsigned int i;
+	const uint8_t *spec = item->spec;
+	const uint8_t *last = item->last;
+	const uint8_t *m = item->mask ? item->mask : mask;
 
-		if (item->mask)
-			apply = item->mask;
-		for (i = 0; i < size; ++i) {
-			spec[i] = ((const uint8_t *)item->spec)[i] & apply[i];
-			last[i] = ((const uint8_t *)item->last)[i] & apply[i];
-		}
-		ret = memcmp(spec, last, size);
-		if (ret != 0) {
-			rte_errno = EINVAL;
-			return -rte_errno;
-		}
+	if (!spec && (item->mask || last))
+		goto error;
+	if (!spec)
+		return 0;
+	for (i = 0; i < size; i++) {
+		if (spec)
+			if (((spec[i] & m[i]) | mask[i]) != mask[i])
+				goto error;
+		if (last)
+			if ((((last[i] & m[i]) | mask[i]) != mask[i]) ||
+			    ((spec[i] & m[i]) != (last[i] & m[i])))
+				goto error;
+		if (m)
+			if ((m[i] | mask[i]) != mask[i])
+				goto error;
 	}
 	return 0;
+error:
+	rte_errno = ENOTSUP;
+	return -rte_errno;
 }
 
 /**
-- 
2.17.0