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net/mlx5e: Use hint to resolve route when in HW multipath mode

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As part of creating the tunnel headers while offloading TC encap rules,
we resolve the route and neighbour in order to get the source /
destination mac.

Since the way we offload multipath route is by having two HW rules,
one per uplink port, doing naive route lookup might get us a "wrong"
routing path which goes through the peer uplink and this will get us
eventually to create a wrong L2 header for the tunnel.

To avoid that, we use a device hint to get the correct route.

Signed-off-by: Roi Dayan <roid@mellanox.com>
Reviewed-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
This commit is contained in:
Roi Dayan 2019-02-05 09:48:38 +02:00 committed by Saeed Mahameed
parent 316d5f72b4
commit 5fb091e813
1 changed files with 12 additions and 0 deletions
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12
drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun.c
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@ -54,12 +54,24 @@ static int mlx5e_route_lookup_ipv4(struct mlx5e_priv *priv,
struct neighbour *n = NULL;
#if IS_ENABLED(CONFIG_INET)
struct mlx5_core_dev *mdev = priv->mdev;
struct net_device *uplink_dev;
int ret;
if (mlx5_lag_is_multipath(mdev)) {
struct mlx5_eswitch *esw = mdev->priv.eswitch;
uplink_dev = mlx5_eswitch_uplink_get_proto_dev(esw, REP_ETH);
fl4->flowi4_oif = uplink_dev->ifindex;
}
rt = ip_route_output_key(dev_net(mirred_dev), fl4);
ret = PTR_ERR_OR_ZERO(rt);
if (ret)
return ret;
if (mlx5_lag_is_multipath(mdev) && !rt->rt_gateway)
return -ENETUNREACH;
#else
return -EOPNOTSUPP;
#endif