net/mlx5: fix representor ID check for sampling

The representor definition was introduced in the latest code.
For non-representor port, like PF port, use the 0xffff instead of -1.

This patch updates the representor id checking during splitting sample
flow.

Fixes: cb95feefdd03 ("net/mlx5: support sub-function representor")
Cc: stable@dpdk.org

Signed-off-by: Jiawei Wang <jiaweiw@nvidia.com>
Acked-by: Xueming Li <xuemingl@nvidia.com>

drivers/net/mlx5/mlx5.h

@@ -1331,7 +1331,7 @@ struct mlx5_priv {
 	uint16_t vport_id; /* Associated VF vport index (if any). */
 	uint32_t vport_meta_tag; /* Used for vport index match ove VF LAG. */
 	uint32_t vport_meta_mask; /* Used for vport index field match mask. */
-	int32_t representor_id; /* -1 if not a representor. */
+	uint16_t representor_id; /* UINT16_MAX if not a representor. */
 	int32_t pf_bond; /* >=0, representor owner PF index in bonding. */
 	unsigned int if_index; /* Associated kernel network device index. */
 	/* RX/TX queues. */

drivers/net/mlx5/mlx5_flow.c

@@ -5900,8 +5900,8 @@ flow_create_split_sample(struct rte_eth_dev *dev,
 						  RTE_FLOW_ERROR_TYPE_ACTION,
 						  NULL, "no memory to split "
 						  "sample flow");
-		/* The representor_id is -1 for uplink. */
-		fdb_tx = (attr->transfer && priv->representor_id != -1);
+		/* The representor_id is UINT16_MAX for uplink. */
+		fdb_tx = (attr->transfer && priv->representor_id != UINT16_MAX);
 		/*
 		 * When reg_c_preserve is set, metadata registers Cx preserve
 		 * their value even through packet duplication.

drivers/net/mlx5/mlx5_flow_dv.c

@@ -5524,7 +5524,7 @@ flow_dv_validate_action_sample(uint64_t *action_flags,
 						  "E-Switch must has a dest "
 						  "port for mirroring");
 		if (!priv->config.hca_attr.reg_c_preserve &&
-		     priv->representor_id != -1)
+		     priv->representor_id != UINT16_MAX)
 			*fdb_mirror_limit = 1;
 	}
 	/* Continue validation for Xcap actions.*/