netdev - [net-next V2 07/13] net/mlx5e: Fail attempt to offload e-switch TC encap flows with vlan on underlay

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Date:   Thu, 20 Dec 2018 10:04:34 -0800
From:   Saeed Mahameed <saeedm@...lanox.com>
To:     "David S. Miller" <davem@...emloft.net>
Cc:     netdev@...r.kernel.org, Eli Britstein <elibr@...lanox.com>,
        Saeed Mahameed <saeedm@...lanox.com>
Subject: [net-next V2 07/13] net/mlx5e: Fail attempt to offload e-switch TC encap flows with vlan on underlay

From: Eli Britstein <elibr@...lanox.com>

Currently we don't support nor fail attempts to offload encap flows routed
to vlan device on the underlay network. We wrongly consider a vlan underlay
device to be on the same e-switch b/c the switchdev ID is retrieved recursively.

Add explicit check for that and fail such attempts.

Also align to a more strict check for the ingress and the underlay devices
to practically be on the same eswitch.

Fixes: ce99f6b97fcd ('net/mlx5e: Support SRIOV TC encapsulation offloads for IPv6 tunnels')
Fixes: 3e621b19b0bb ('net/mlx5e: Support TC encapsulation offloads with upper devices')
Signed-off-by: Eli Britstein <elibr@...lanox.com>
Reviewed-by: Roi Dayan <roid@...lanox.com>
Signed-off-by: Saeed Mahameed <saeedm@...lanox.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun.c | 6 ++++++
 1 file changed, 6 insertions(+)

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 c90a0f9cb6e1..0d24e9648c21 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun.c
@@ -15,6 +15,10 @@ static int get_route_and_out_devs(struct mlx5e_priv *priv,
 	struct net_device *uplink_dev, *uplink_upper;
 	bool dst_is_lag_dev;
 
+	/* we currently don't offload vlan on underlay */
+	if (is_vlan_dev(dev))
+		return -EOPNOTSUPP;
+
 	uplink_dev = mlx5_eswitch_uplink_get_proto_dev(esw, REP_ETH);
 	uplink_upper = netdev_master_upper_dev_get(uplink_dev);
 	dst_is_lag_dev = (uplink_upper &&
@@ -28,6 +32,8 @@ static int get_route_and_out_devs(struct mlx5e_priv *priv,
 	if (!switchdev_port_same_parent_id(priv->netdev, dev) ||
 	    dst_is_lag_dev)
 		*out_dev = uplink_dev;
+	else if (!mlx5e_eswitch_rep(dev))
+		return -EOPNOTSUPP;
 	else
 		*out_dev = dev;
 
-- 
2.19.2