netdev - Re: [PATCH v3] net/mlx5e: Don't allow forwarding between uplink

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Date:   Wed, 22 Jan 2020 14:33:54 +0100
From:   Jiri Pirko <jiri@...nulli.us>
To:     xiangxia.m.yue@...il.com
Cc:     gerlitz.or@...il.com, roid@...lanox.com, saeedm@....mellanox.co.il,
        netdev@...r.kernel.org
Subject: Re: [PATCH v3] net/mlx5e: Don't allow forwarding between uplink

Wed, Jan 22, 2020 at 12:15:03PM CET, xiangxia.m.yue@...il.com wrote:
>From: Tonghao Zhang <xiangxia.m.yue@...il.com>
>
>We can install forwarding packets rule between uplink
>in switchdev mode, as show below. But the hardware does
>not do that as expected (mlnx_perf -i $PF1, we can't get
>the counter of the PF1). By the way, if we add the uplink
>PF0, PF1 to Open vSwitch and enable hw-offload, the rules
>can be offloaded but not work fine too. This patch add a
>check and if so return -EOPNOTSUPP.
>
>$ tc filter add dev $PF0 protocol all parent ffff: prio 1 handle 1 \
>    flower skip_sw action mirred egress redirect dev $PF1
>
>$ tc -d -s filter show dev $PF0 ingress
>    skip_sw
>    in_hw in_hw_count 1
>    action order 1: mirred (Egress Redirect to device enp130s0f1) stolen
>    ...
>    Sent hardware 408954 bytes 4173 pkt
>    ...
>
>Signed-off-by: Tonghao Zhang <xiangxia.m.yue@...il.com>
>---
> drivers/net/ethernet/mellanox/mlx5/core/en_rep.c |  5 +++++
> drivers/net/ethernet/mellanox/mlx5/core/en_rep.h |  1 +
> drivers/net/ethernet/mellanox/mlx5/core/en_tc.c  | 19 +++++++++++++++++++
> 3 files changed, 25 insertions(+)
>
>diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c b/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c
>index f175cb2..ac2a035 100644
>--- a/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c
>+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c
>@@ -1434,6 +1434,11 @@ static struct devlink_port *mlx5e_get_devlink_port(struct net_device *dev)
> 	.ndo_set_features        = mlx5e_set_features,
> };
> 
>+bool mlx5e_eswitch_uplink_rep(struct net_device *netdev)
>+{
>+	return netdev->netdev_ops == &mlx5e_netdev_ops_uplink_rep;
>+}
>+
> bool mlx5e_eswitch_rep(struct net_device *netdev)
> {
> 	if (netdev->netdev_ops == &mlx5e_netdev_ops_rep ||
>diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_rep.h b/drivers/net/ethernet/mellanox/mlx5/core/en_rep.h
>index 31f83c8..5211819 100644
>--- a/drivers/net/ethernet/mellanox/mlx5/core/en_rep.h
>+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_rep.h
>@@ -199,6 +199,7 @@ void mlx5e_rep_encap_entry_detach(struct mlx5e_priv *priv,
> void mlx5e_rep_queue_neigh_stats_work(struct mlx5e_priv *priv);
> 
> bool mlx5e_eswitch_rep(struct net_device *netdev);
>+bool mlx5e_eswitch_uplink_rep(struct net_device *netdev);
> 
> #else /* CONFIG_MLX5_ESWITCH */
> static inline bool mlx5e_is_uplink_rep(struct mlx5e_priv *priv) { return false; }
>diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
>index db614bd..35f68e4 100644
>--- a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
>+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
>@@ -3361,6 +3361,7 @@ static int parse_tc_fdb_actions(struct mlx5e_priv *priv,
> 				struct mlx5_eswitch *esw = priv->mdev->priv.eswitch;
> 				struct net_device *uplink_dev = mlx5_eswitch_uplink_get_proto_dev(esw, REP_ETH);
> 				struct net_device *uplink_upper;
>+				struct mlx5e_rep_priv *rep_priv;
> 
> 				if (is_duplicated_output_device(priv->netdev,
> 								out_dev,
>@@ -3396,6 +3397,24 @@ static int parse_tc_fdb_actions(struct mlx5e_priv *priv,
> 						return err;
> 				}
> 
>+				/* Don't allow forwarding between uplink.
>+				 *
>+				 * Input vport was stored esw_attr->in_rep.
>+				 * In LAG case, *priv* is the private data of
>+				 * uplink which may be not the input vport.
>+				 */
>+				rep_priv = mlx5e_rep_to_rep_priv(attr->in_rep);
>+				if (mlx5e_eswitch_uplink_rep(rep_priv->netdev) &&
>+				    mlx5e_eswitch_uplink_rep(out_dev)) {
>+					NL_SET_ERR_MSG_MOD(extack,
>+							   "devices are both uplink, "

Never break error messages.


>+							   "can't offload forwarding");
>+					pr_err("devices %s %s are both uplink, "

Here as well.


>+					       "can't offload forwarding\n",
>+					       priv->netdev->name, out_dev->name);
>+					return -EOPNOTSUPP;
>+				}
>+
> 				if (!mlx5e_is_valid_eswitch_fwd_dev(priv, out_dev)) {
> 					NL_SET_ERR_MSG_MOD(extack,
> 							   "devices are not on same switch HW, can't offload forwarding");
>-- 
>1.8.3.1
>