net/mlx5: Accept flow rules without match

Allow passing NULL spec when creating a flow rule. Such rules will act
as "catch all" flow rules.
Signed-off-by: Mark Bloch <markb@mellanox.com>
Reviewed-by: Maor Gottlieb <maorg@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

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

@@ -175,28 +175,20 @@ static int arfs_add_default_rule(struct mlx5e_priv *priv,
 	struct mlx5e_tir *tir = priv->indir_tir;
 	struct mlx5_flow_destination dest = {};
 	MLX5_DECLARE_FLOW_ACT(flow_act);
-	struct mlx5_flow_spec *spec;
 	enum mlx5e_traffic_types tt;
 	int err = 0;
 
-	spec = kvzalloc(sizeof(*spec), GFP_KERNEL);
-	if (!spec) {
-		err = -ENOMEM;
-		goto out;
-	}
-
 	dest.type = MLX5_FLOW_DESTINATION_TYPE_TIR;
 	tt = arfs_get_tt(type);
 	if (tt == -EINVAL) {
 		netdev_err(priv->netdev, "%s: bad arfs_type: %d\n",
 			   __func__, type);
-		err = -EINVAL;
-		goto out;
+		return -EINVAL;
 	}
 
 	dest.tir_num = tir[tt].tirn;
 
-	arfs_t->default_rule = mlx5_add_flow_rules(arfs_t->ft.t, spec,
+	arfs_t->default_rule = mlx5_add_flow_rules(arfs_t->ft.t, NULL,
 						   &flow_act,
 						   &dest, 1);
 	if (IS_ERR(arfs_t->default_rule)) {
@@ -205,8 +197,7 @@ static int arfs_add_default_rule(struct mlx5e_priv *priv,
 		netdev_err(priv->netdev, "%s: add rule failed, arfs type=%d\n",
 			   __func__, type);
 	}
-out:
-	kvfree(spec);
+
 	return err;
 }
 

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

@@ -1334,7 +1334,6 @@ static int esw_vport_ingress_config(struct mlx5_eswitch *esw,
 		goto out;
 	}
 
-	memset(spec, 0, sizeof(*spec));
 	flow_act.action = MLX5_FLOW_CONTEXT_ACTION_DROP;
 
 	/* Attach drop flow counter */
@@ -1346,7 +1345,7 @@ static int esw_vport_ingress_config(struct mlx5_eswitch *esw,
 		dest_num++;
 	}
 	vport->ingress.legacy.drop_rule =
-		mlx5_add_flow_rules(vport->ingress.acl, spec,
+		mlx5_add_flow_rules(vport->ingress.acl, NULL,
 				    &flow_act, dst, dest_num);
 	if (IS_ERR(vport->ingress.legacy.drop_rule)) {
 		err = PTR_ERR(vport->ingress.legacy.drop_rule);
@@ -1409,7 +1408,6 @@ static int esw_vport_egress_config(struct mlx5_eswitch *esw,
 	struct mlx5_flow_destination drop_ctr_dst = {0};
 	struct mlx5_flow_destination *dst = NULL;
 	struct mlx5_flow_act flow_act = {0};
-	struct mlx5_flow_spec *spec;
 	int dest_num = 0;
 	int err = 0;
 
@@ -1438,11 +1436,6 @@ static int esw_vport_egress_config(struct mlx5_eswitch *esw,
 	if (err)
 		return err;
 
-	/* Drop others rule (star rule) */
-	spec = kvzalloc(sizeof(*spec), GFP_KERNEL);
-	if (!spec)
-		goto out;
-
 	flow_act.action = MLX5_FLOW_CONTEXT_ACTION_DROP;
 
 	/* Attach egress drop flow counter */
@@ -1454,7 +1447,7 @@ static int esw_vport_egress_config(struct mlx5_eswitch *esw,
 		dest_num++;
 	}
 	vport->egress.legacy.drop_rule =
-		mlx5_add_flow_rules(vport->egress.acl, spec,
+		mlx5_add_flow_rules(vport->egress.acl, NULL,
 				    &flow_act, dst, dest_num);
 	if (IS_ERR(vport->egress.legacy.drop_rule)) {
 		err = PTR_ERR(vport->egress.legacy.drop_rule);
@@ -1463,8 +1456,7 @@ static int esw_vport_egress_config(struct mlx5_eswitch *esw,
 			 vport->vport, err);
 		vport->egress.legacy.drop_rule = NULL;
 	}
-out:
-	kvfree(spec);
+
 	return err;
 }
 
@@ -2481,12 +2473,11 @@ static int _mlx5_eswitch_set_vepa_locked(struct mlx5_eswitch *esw,
 	}
 
 	/* Star rule to forward all traffic to uplink vport */
-	memset(spec, 0, sizeof(*spec));
 	memset(&dest, 0, sizeof(dest));
 	dest.type = MLX5_FLOW_DESTINATION_TYPE_VPORT;
 	dest.vport.num = MLX5_VPORT_UPLINK;
 	flow_act.action = MLX5_FLOW_CONTEXT_ACTION_FWD_DEST;
-	flow_rule = mlx5_add_flow_rules(esw->fdb_table.legacy.vepa_fdb, spec,
+	flow_rule = mlx5_add_flow_rules(esw->fdb_table.legacy.vepa_fdb, NULL,
 					&flow_act, &dest, 1);
 	if (IS_ERR(flow_rule)) {
 		err = PTR_ERR(flow_rule);

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

@@ -1881,7 +1881,6 @@ static int esw_vport_add_ingress_acl_modify_metadata(struct mlx5_eswitch *esw,
 						     struct mlx5_vport *vport)
 {
 	u8 action[MLX5_UN_SZ_BYTES(set_action_in_add_action_in_auto)] = {};
-	static const struct mlx5_flow_spec spec = {};
 	struct mlx5_flow_act flow_act = {};
 	int err = 0;
 	u32 key;
@@ -1913,7 +1912,7 @@ static int esw_vport_add_ingress_acl_modify_metadata(struct mlx5_eswitch *esw,
 	flow_act.modify_hdr = vport->ingress.offloads.modify_metadata;
 	vport->ingress.offloads.modify_metadata_rule =
 				mlx5_add_flow_rules(vport->ingress.acl,
-						    &spec, &flow_act, NULL, 0);
+						    NULL, &flow_act, NULL, 0);
 	if (IS_ERR(vport->ingress.offloads.modify_metadata_rule)) {
 		err = PTR_ERR(vport->ingress.offloads.modify_metadata_rule);
 		esw_warn(esw->dev,

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

@@ -410,7 +410,6 @@ mlx5_esw_chains_add_miss_rule(struct fdb_chain *fdb_chain,
 			      struct mlx5_flow_table *fdb,
 			      struct mlx5_flow_table *next_fdb)
 {
-	static const struct mlx5_flow_spec spec = {};
 	struct mlx5_eswitch *esw = fdb_chain->esw;
 	struct mlx5_flow_destination dest = {};
 	struct mlx5_flow_act act = {};
@@ -425,7 +424,7 @@ mlx5_esw_chains_add_miss_rule(struct fdb_chain *fdb_chain,
 		act.action |= MLX5_FLOW_CONTEXT_ACTION_MOD_HDR;
 	}
 
-	return mlx5_add_flow_rules(fdb, &spec, &act, &dest, 1);
+	return mlx5_add_flow_rules(fdb, NULL, &act, &dest, 1);
 }
 
 static int

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

@@ -49,7 +49,6 @@ mlx5_eswitch_termtbl_create(struct mlx5_core_dev *dev,
 			    struct mlx5_termtbl_handle *tt,
 			    struct mlx5_flow_act *flow_act)
 {
-	static const struct mlx5_flow_spec spec = {};
 	struct mlx5_flow_table_attr ft_attr = {};
 	struct mlx5_flow_namespace *root_ns;
 	int err;
@@ -73,7 +72,7 @@ mlx5_eswitch_termtbl_create(struct mlx5_core_dev *dev,
 		return -EOPNOTSUPP;
 	}
 
-	tt->rule = mlx5_add_flow_rules(tt->termtbl, &spec, flow_act,
+	tt->rule = mlx5_add_flow_rules(tt->termtbl, NULL, flow_act,
 				       &tt->dest, 1);
 
 	if (IS_ERR(tt->rule)) {

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

@@ -1892,12 +1892,16 @@ mlx5_add_flow_rules(struct mlx5_flow_table *ft,
 		    int num_dest)
 {
 	struct mlx5_flow_root_namespace *root = find_root(&ft->node);
+	static const struct mlx5_flow_spec zero_spec = {};
 	struct mlx5_flow_destination gen_dest = {};
 	struct mlx5_flow_table *next_ft = NULL;
 	struct mlx5_flow_handle *handle = NULL;
 	u32 sw_action = flow_act->action;
 	struct fs_prio *prio;
 
+	if (!spec)
+		spec = &zero_spec;
+
 	fs_get_obj(prio, ft->node.parent);
 	if (flow_act->action == MLX5_FLOW_CONTEXT_ACTION_FWD_NEXT_PRIO) {
 		if (!fwd_next_prio_supported(ft))