From: Maor Dickman <maord@mellanox.com>
Date: Thu, 23 Apr 2020 15:16:17 +0300
Subject: net/mlx5e: Fix allowed tc redirect merged eswitch offload cases
Patch-mainline: v5.7-rc7
Git-commit: 321348475d544aa6705dcfac2135deeccb8dc0bb
References: jsc#SLE-15172

After changing the parent_id to be the same for both NICs of same
The cited commit wrongly allow offload of tc redirect flows from
VF to uplink and vice versa when devcies are on different eswitch,
these cases aren't supported by HW.

Disallow the above offloads when devcies are on different eswitch
and VF LAG is not configured.

Fixes: f6dc1264f1c0 ("net/mlx5e: Disallow tc redirect offload cases we don't support")
Signed-off-by: Maor Dickman <maord@mellanox.com>
Reviewed-by: Roi Dayan <roid@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/mellanox/mlx5/core/en_rep.c |    8 +---
 drivers/net/ethernet/mellanox/mlx5/core/en_rep.h |    7 +++-
 drivers/net/ethernet/mellanox/mlx5/core/en_tc.c  |   40 ++++++++++++++++++-----
 3 files changed, 41 insertions(+), 14 deletions(-)

--- a/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c
@@ -1484,13 +1484,9 @@ bool mlx5e_eswitch_uplink_rep(struct net
 	return netdev->netdev_ops == &mlx5e_netdev_ops_uplink_rep;
 }
 
-bool mlx5e_eswitch_rep(struct net_device *netdev)
+bool mlx5e_eswitch_vf_rep(struct net_device *netdev)
 {
-	if (netdev->netdev_ops == &mlx5e_netdev_ops_rep ||
-	    netdev->netdev_ops == &mlx5e_netdev_ops_uplink_rep)
-		return true;
-
-	return false;
+	return netdev->netdev_ops == &mlx5e_netdev_ops_rep;
 }
 
 static void mlx5e_build_rep_params(struct net_device *netdev)
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_rep.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_rep.h
@@ -210,8 +210,13 @@ void mlx5e_rep_encap_entry_detach(struct
 
 void mlx5e_rep_queue_neigh_stats_work(struct mlx5e_priv *priv);
 
-bool mlx5e_eswitch_rep(struct net_device *netdev);
+bool mlx5e_eswitch_vf_rep(struct net_device *netdev);
 bool mlx5e_eswitch_uplink_rep(struct net_device *netdev);
+static inline bool mlx5e_eswitch_rep(struct net_device *netdev)
+{
+	return mlx5e_eswitch_vf_rep(netdev) ||
+	       mlx5e_eswitch_uplink_rep(netdev);
+}
 
 #else /* CONFIG_MLX5_ESWITCH */
 static inline bool mlx5e_is_uplink_rep(struct mlx5e_priv *priv) { return false; }
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
@@ -3073,6 +3073,11 @@ static bool actions_match_supported(stru
 	return true;
 }
 
+static bool same_port_devs(struct mlx5e_priv *priv, struct mlx5e_priv *peer_priv)
+{
+	return priv->mdev == peer_priv->mdev;
+}
+
 static bool same_hw_devs(struct mlx5e_priv *priv, struct mlx5e_priv *peer_priv)
 {
 	struct mlx5_core_dev *fmdev, *pmdev;
@@ -3291,7 +3296,7 @@ static inline int hash_encap_info(struct
 }
 
 
-static bool is_merged_eswitch_dev(struct mlx5e_priv *priv,
+static bool is_merged_eswitch_vfs(struct mlx5e_priv *priv,
 				  struct net_device *peer_netdev)
 {
 	struct mlx5e_priv *peer_priv;
@@ -3299,13 +3304,11 @@ static bool is_merged_eswitch_dev(struct
 	peer_priv = netdev_priv(peer_netdev);
 
 	return (MLX5_CAP_ESW(priv->mdev, merged_eswitch) &&
-		mlx5e_eswitch_rep(priv->netdev) &&
-		mlx5e_eswitch_rep(peer_netdev) &&
+		mlx5e_eswitch_vf_rep(priv->netdev) &&
+		mlx5e_eswitch_vf_rep(peer_netdev) &&
 		same_hw_devs(priv, peer_priv));
 }
 
-
-
 bool mlx5e_encap_take(struct mlx5e_encap_entry *e)
 {
 	return refcount_inc_not_zero(&e->refcnt);
@@ -3575,14 +3578,37 @@ static int add_vlan_pop_action(struct ml
 	return err;
 }
 
+static bool same_hw_reps(struct mlx5e_priv *priv,
+			 struct net_device *peer_netdev)
+{
+	struct mlx5e_priv *peer_priv;
+
+	peer_priv = netdev_priv(peer_netdev);
+
+	return mlx5e_eswitch_rep(priv->netdev) &&
+	       mlx5e_eswitch_rep(peer_netdev) &&
+	       same_hw_devs(priv, peer_priv);
+}
+
+static bool is_lag_dev(struct mlx5e_priv *priv,
+		       struct net_device *peer_netdev)
+{
+	return ((mlx5_lag_is_sriov(priv->mdev) ||
+		 mlx5_lag_is_multipath(priv->mdev)) &&
+		 same_hw_reps(priv, peer_netdev));
+}
+
 bool mlx5e_is_valid_eswitch_fwd_dev(struct mlx5e_priv *priv,
 				    struct net_device *out_dev)
 {
-	if (is_merged_eswitch_dev(priv, out_dev))
+	if (is_merged_eswitch_vfs(priv, out_dev))
+		return true;
+
+	if (is_lag_dev(priv, out_dev))
 		return true;
 
 	return mlx5e_eswitch_rep(out_dev) &&
-	       same_hw_devs(priv, netdev_priv(out_dev));
+	       same_port_devs(priv, netdev_priv(out_dev));
 }
 
 static bool is_duplicated_output_device(struct net_device *dev,