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Date:   Tue,  7 Jan 2020 17:52:18 +0800
From:   xiangxia.m.yue@...il.com
To:     gerlitz.or@...il.com, saeedm@....mellanox.co.il, roid@...lanox.com
Cc:     netdev@...r.kernel.org, Tonghao Zhang <xiangxia.m.yue@...il.com>
Subject: [PATCH net-next] net/mlx5e: Don't allow forwarding between uplink

From: Tonghao Zhang <xiangxia.m.yue@...il.com>

We can install forwarding packets rule between uplink
in eswitchdev 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 408954 bytes 4173 pkt (dropped 0, overlimits 0 requeues 0)
	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 |  7 ++++++-
 drivers/net/ethernet/mellanox/mlx5/core/en_rep.h |  1 +
 drivers/net/ethernet/mellanox/mlx5/core/en_tc.c  | 16 +++++++++++++---
 3 files changed, 20 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c b/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c
index f175cb2..63fad66 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c
@@ -1434,10 +1434,15 @@ 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 ||
-	    netdev->netdev_ops == &mlx5e_netdev_ops_uplink_rep)
+	    mlx5e_eswitch_uplink_rep(netdev))
 		return true;
 
 	return false;
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_rep.h b/drivers/net/ethernet/mellanox/mlx5/core/en_rep.h
index 31f83c8..282c64b 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_rep.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_rep.h
@@ -198,6 +198,7 @@ void mlx5e_rep_encap_entry_detach(struct mlx5e_priv *priv,
 
 void mlx5e_rep_queue_neigh_stats_work(struct mlx5e_priv *priv);
 
+bool mlx5e_eswitch_uplink_rep(struct net_device *netdev);
 bool mlx5e_eswitch_rep(struct net_device *netdev);
 
 #else /* CONFIG_MLX5_ESWITCH */
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
index f91e057e..b2c18fa 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
@@ -3214,6 +3214,10 @@ static int add_vlan_pop_action(struct mlx5e_priv *priv,
 bool mlx5e_is_valid_eswitch_fwd_dev(struct mlx5e_priv *priv,
 				    struct net_device *out_dev)
 {
+	if (mlx5e_eswitch_uplink_rep(priv->netdev) &&
+	    mlx5e_eswitch_uplink_rep(out_dev))
+		return false;
+
 	if (is_merged_eswitch_dev(priv, out_dev))
 		return true;
 
@@ -3339,9 +3343,15 @@ static int parse_tc_fdb_actions(struct mlx5e_priv *priv,
 
 				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");
-					pr_err("devices %s %s not on same switch HW, can't offload forwarding\n",
-					       priv->netdev->name, out_dev->name);
+							   "devices are both uplink "
+							   "or not on same switch HW, "
+							   "can't offload forwarding");
+					pr_err("devices %s %s are both uplink "
+					       "or not on same switch HW, "
+					       "can't offload forwarding\n",
+					       priv->netdev->name,
+					       out_dev->name);
+
 					return -EOPNOTSUPP;
 				}
 
-- 
1.8.3.1

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