net/mlx5e: Remove redundant hashtable lookup in configure flower

We will never find a flow with the same cookie as cls_flower always
allocates a new flow and the cookie is the allocated memory address.

Fixes: e3a2b7ed ("net/mlx5e: Support offload cls_flower with drop action")
Signed-off-by: Roi Dayan <roid@mellanox.com>
Reviewed-by: Hadar Hen Zion <hadarh@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlx5/core/en_tc.c

@@ -915,25 +915,17 @@ int mlx5e_configure_flower(struct mlx5e_priv *priv, __be16 protocol,
 	u32 flow_tag, action;
 	struct mlx5e_tc_flow *flow;
 	struct mlx5_flow_spec *spec;
-	struct mlx5_flow_handle *old = NULL;
-	struct mlx5_esw_flow_attr *old_attr = NULL;
 	struct mlx5_eswitch *esw = priv->mdev->priv.eswitch;
 
 	if (esw && esw->mode == SRIOV_OFFLOADS)
 		fdb_flow = true;
 
-	flow = rhashtable_lookup_fast(&tc->ht, &f->cookie,
-				      tc->ht_params);
-	if (flow) {
-		old = flow->rule;
-		old_attr = flow->attr;
-	} else {
 	if (fdb_flow)
-			flow = kzalloc(sizeof(*flow) + sizeof(struct mlx5_esw_flow_attr),
+		flow = kzalloc(sizeof(*flow) +
+			       sizeof(struct mlx5_esw_flow_attr),
 			       GFP_KERNEL);
 	else
 		flow = kzalloc(sizeof(*flow), GFP_KERNEL);
-	}
 
 	spec = mlx5_vzalloc(sizeof(*spec));
 	if (!spec || !flow) {
@@ -970,16 +962,12 @@ int mlx5e_configure_flower(struct mlx5e_priv *priv, __be16 protocol,
 	if (err)
 		goto err_del_rule;
 
-	if (old)
-		mlx5e_tc_del_flow(priv, old, old_attr);
-
 	goto out;
 
 err_del_rule:
 	mlx5_del_flow_rules(flow->rule);
 
 err_free:
-	if (!old)
 	kfree(flow);
 out:
 	kvfree(spec);