net/mlx5e: Ignore attempts to offload multiple times a TC flow

For VF->VF and uplink->VF rules, the TC core (cls_api) attempts
to offload the same flow multiple times into the driver, b/c we
registered to the egdev callback.

Use the flow cookie to ignore attempts to add such flows, we can't
reject them (return error), b/c this will fail the offload attempt,
so we ignore that. We indentify wrong stat/del calls using the flow
ingress/egress flags, here we do return error to the core.

Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Reviewed-by: Paul Blakey <paulb@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
index 05c90b4f8a31f8f6045bde29951b4af394f0e2a7..674f1d7d273785ad6ba72fbee3404738982bd89d 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
@@ -2666,6 +2666,12 @@ int mlx5e_configure_flower(struct mlx5e_priv *priv,
 
        get_flags(flags, &flow_flags);
 
+       flow = rhashtable_lookup_fast(tc_ht, &f->cookie, tc_ht_params);
+       if (flow) {
+               netdev_warn_once(priv->netdev, "flow cookie %lx already exists, ignoring\n", f->cookie);
+               return 0;
+       }
+
        if (esw && esw->mode == SRIOV_OFFLOADS) {
                flow_flags |= MLX5E_TC_FLOW_ESWITCH;
                attr_size  = sizeof(struct mlx5_esw_flow_attr);
@@ -2728,6 +2734,17 @@ err_free:
        return err;
 }
 
+#define DIRECTION_MASK (MLX5E_TC_INGRESS | MLX5E_TC_EGRESS)
+#define FLOW_DIRECTION_MASK (MLX5E_TC_FLOW_INGRESS | MLX5E_TC_FLOW_EGRESS)
+
+static bool same_flow_direction(struct mlx5e_tc_flow *flow, int flags)
+{
+       if ((flow->flags & FLOW_DIRECTION_MASK) == (flags & DIRECTION_MASK))
+               return true;
+
+       return false;
+}
+
 int mlx5e_delete_flower(struct mlx5e_priv *priv,
                        struct tc_cls_flower_offload *f, int flags)
 {
@@ -2735,7 +2752,7 @@ int mlx5e_delete_flower(struct mlx5e_priv *priv,
        struct mlx5e_tc_flow *flow;
 
        flow = rhashtable_lookup_fast(tc_ht, &f->cookie, tc_ht_params);
-       if (!flow)
+       if (!flow || !same_flow_direction(flow, flags))
                return -EINVAL;
 
        rhashtable_remove_fast(tc_ht, &flow->node, tc_ht_params);
@@ -2758,7 +2775,7 @@ int mlx5e_stats_flower(struct mlx5e_priv *priv,
        u64 lastuse;
 
        flow = rhashtable_lookup_fast(tc_ht, &f->cookie, tc_ht_params);
-       if (!flow)
+       if (!flow || !same_flow_direction(flow, flags))
                return -EINVAL;
 
        if (!(flow->flags & MLX5E_TC_FLOW_OFFLOADED))