net/mlx5e: Specify out ifindex when looking up encap route

There is a use case that the local and remote VTEPs are in the same
host. Currently, the out ifindex is not specified when looking up the
encap route for offloads. So in this case, a local route is returned
and the route dev is lo.

Actual tunnel interface can be created with a parameter "dev" [1],
which specifies the physical device to use for tunnel endpoint
communication. Pass this parameter to driver when looking up encap
route for offloads. So that a unicast route will be returned.

[1] ip link add name vxlan1 type vxlan id 100 dev enp4s0f0 remote 1.1.1.1 dstport 4789

Signed-off-by: Chris Mi <cmi@nvidia.com>
Reviewed-by: Maor Dickman <maord@nvidia.com>
Reviewed-by: Roi Dayan <roid@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun.c b/drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun.c
index b4e9868..cc7d7b8 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun.c
@@ -118,6 +118,11 @@
 
 		uplink_dev = mlx5_eswitch_uplink_get_proto_dev(esw, REP_ETH);
 		attr->fl.fl4.flowi4_oif = uplink_dev->ifindex;
+	} else {
+		struct mlx5e_tc_tunnel *tunnel = mlx5e_get_tc_tun(mirred_dev);
+
+		if (tunnel && tunnel->get_remote_ifindex)
+			attr->fl.fl4.flowi4_oif = tunnel->get_remote_ifindex(mirred_dev);
 	}
 
 	rt = ip_route_output_key(dev_net(mirred_dev), &attr->fl.fl4);
@@ -435,12 +440,15 @@
 				       struct net_device *mirred_dev,
 				       struct mlx5e_tc_tun_route_attr *attr)
 {
+	struct mlx5e_tc_tunnel *tunnel = mlx5e_get_tc_tun(mirred_dev);
 	struct net_device *route_dev;
 	struct net_device *out_dev;
 	struct dst_entry *dst;
 	struct neighbour *n;
 	int ret;
 
+	if (tunnel && tunnel->get_remote_ifindex)
+		attr->fl.fl6.flowi6_oif = tunnel->get_remote_ifindex(mirred_dev);
 	dst = ipv6_stub->ipv6_dst_lookup_flow(dev_net(mirred_dev), NULL, &attr->fl.fl6,
 					      NULL);
 	if (IS_ERR(dst))
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun.h b/drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun.h
index 9350ca0..aa092ea 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun.h
@@ -51,6 +51,7 @@
 			    void *headers_v);
 	bool (*encap_info_equal)(struct mlx5e_encap_key *a,
 				 struct mlx5e_encap_key *b);
+	int (*get_remote_ifindex)(struct net_device *mirred_dev);
 };
 
 extern struct mlx5e_tc_tunnel vxlan_tunnel;
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun_vxlan.c b/drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun_vxlan.c
index 4267f3a..fd07c4c 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun_vxlan.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun_vxlan.c
@@ -141,6 +141,14 @@
 	return 0;
 }
 
+static int mlx5e_tc_tun_get_remote_ifindex(struct net_device *mirred_dev)
+{
+	const struct vxlan_dev *vxlan = netdev_priv(mirred_dev);
+	const struct vxlan_rdst *dst = &vxlan->default_dst;
+
+	return dst->remote_ifindex;
+}
+
 struct mlx5e_tc_tunnel vxlan_tunnel = {
 	.tunnel_type          = MLX5E_TC_TUNNEL_TYPE_VXLAN,
 	.match_level          = MLX5_MATCH_L4,
@@ -151,4 +159,5 @@
 	.parse_udp_ports      = mlx5e_tc_tun_parse_udp_ports_vxlan,
 	.parse_tunnel         = mlx5e_tc_tun_parse_vxlan,
 	.encap_info_equal     = mlx5e_tc_tun_encap_info_equal_generic,
+	.get_remote_ifindex   = mlx5e_tc_tun_get_remote_ifindex,
 };