net/mlx5e: Use vhca id as the hairpin peer identifier

The peer vhca id spans less bits vs the ifindex and can
well serve for the hairpin hash key, move to use that.

This is a pre-step to put more info into the hairpin hash
key in downstream patch while keeping it at 32 bits.
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

drivers/net/ethernet/mellanox/mlx5/core/en_tc.c

@@ -111,7 +111,7 @@ struct mlx5e_hairpin_entry {
 	/* flows sharing the same hairpin */
 	struct list_head flows;
 
-	int peer_ifindex;
+	u16 peer_vhca_id;
 	struct mlx5e_hairpin *hp;
 };
 
@@ -334,13 +334,13 @@ static void mlx5e_hairpin_destroy(struct mlx5e_hairpin *hp)
 }
 
 static struct mlx5e_hairpin_entry *mlx5e_hairpin_get(struct mlx5e_priv *priv,
-						     int peer_ifindex)
+						     u16 peer_vhca_id)
 {
 	struct mlx5e_hairpin_entry *hpe;
 
 	hash_for_each_possible(priv->fs.tc.hairpin_tbl, hpe,
-			       hairpin_hlist, peer_ifindex) {
-		if (hpe->peer_ifindex == peer_ifindex)
+			       hairpin_hlist, peer_vhca_id) {
+		if (hpe->peer_vhca_id == peer_vhca_id)
 			return hpe;
 	}
 
@@ -353,16 +353,20 @@ static int mlx5e_hairpin_flow_add(struct mlx5e_priv *priv,
 {
 	int peer_ifindex = parse_attr->mirred_ifindex;
 	struct mlx5_hairpin_params params;
+	struct mlx5_core_dev *peer_mdev;
 	struct mlx5e_hairpin_entry *hpe;
 	struct mlx5e_hairpin *hp;
+	u16 peer_id;
 	int err;
 
-	if (!MLX5_CAP_GEN(priv->mdev, hairpin)) {
+	peer_mdev = mlx5e_hairpin_get_mdev(dev_net(priv->netdev), peer_ifindex);
+	if (!MLX5_CAP_GEN(priv->mdev, hairpin) || !MLX5_CAP_GEN(peer_mdev, hairpin)) {
 		netdev_warn(priv->netdev, "hairpin is not supported\n");
 		return -EOPNOTSUPP;
 	}
 
-	hpe = mlx5e_hairpin_get(priv, peer_ifindex);
+	peer_id = MLX5_CAP_GEN(peer_mdev, vhca_id);
+	hpe = mlx5e_hairpin_get(priv, peer_id);
 	if (hpe)
 		goto attach_flow;
 
@@ -371,7 +375,7 @@ static int mlx5e_hairpin_flow_add(struct mlx5e_priv *priv,
 		return -ENOMEM;
 
 	INIT_LIST_HEAD(&hpe->flows);
-	hpe->peer_ifindex = peer_ifindex;
+	hpe->peer_vhca_id = peer_id;
 
 	params.log_data_size = 15;
 	params.log_data_size = min_t(u8, params.log_data_size,
@@ -391,7 +395,7 @@ static int mlx5e_hairpin_flow_add(struct mlx5e_priv *priv,
 		   hp->pair->sqn, params.log_data_size);
 
 	hpe->hp = hp;
-	hash_add(priv->fs.tc.hairpin_tbl, &hpe->hairpin_hlist, peer_ifindex);
+	hash_add(priv->fs.tc.hairpin_tbl, &hpe->hairpin_hlist, peer_id);
 
 attach_flow:
 	flow->nic_attr->hairpin_tirn = hpe->hp->tirn;