goto.c

  1// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
  2// Copyright (c) 2021, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
  3
  4#include "act.h"
  5#include "en/tc_priv.h"
  6#include "eswitch.h"
  7
  8static int
  9validate_goto_chain(struct mlx5e_priv *priv,
 10		    struct mlx5e_tc_flow *flow,
 11		    struct mlx5_flow_attr *attr,
 12		    const struct flow_action_entry *act,
 13		    struct netlink_ext_ack *extack)
 14{
 15	struct mlx5e_tc_table *tc = mlx5e_fs_get_tc(priv->fs);
 16	bool is_esw = mlx5e_is_eswitch_flow(flow);
 17	bool ft_flow = mlx5e_is_ft_flow(flow);
 18	u32 dest_chain = act->chain_index;
 19	struct mlx5_fs_chains *chains;
 20	struct mlx5_eswitch *esw;
 21	u32 reformat_and_fwd;
 22	u32 max_chain;
 23
 24	esw = priv->mdev->priv.eswitch;
 25	chains = is_esw ? esw_chains(esw) : mlx5e_nic_chains(tc);
 26	max_chain = mlx5_chains_get_chain_range(chains);
 27	reformat_and_fwd = is_esw ?
 28			   MLX5_CAP_ESW_FLOWTABLE_FDB(priv->mdev, reformat_and_fwd_to_table) :
 29			   MLX5_CAP_FLOWTABLE_NIC_RX(priv->mdev, reformat_and_fwd_to_table);
 30
 31	if (ft_flow) {
 32		NL_SET_ERR_MSG_MOD(extack, "Goto action is not supported");
 33		return -EOPNOTSUPP;
 34	}
 35
 36	if (!mlx5_chains_backwards_supported(chains) &&
 37	    dest_chain <= attr->chain) {
 38		NL_SET_ERR_MSG_MOD(extack, "Goto lower numbered chain isn't supported");
 39		return -EOPNOTSUPP;
 40	}
 41
 42	if (dest_chain > max_chain) {
 43		NL_SET_ERR_MSG_MOD(extack,
 44				   "Requested destination chain is out of supported range");
 45		return -EOPNOTSUPP;
 46	}
 47
 48	if (attr->action & (MLX5_FLOW_CONTEXT_ACTION_PACKET_REFORMAT |
 49			    MLX5_FLOW_CONTEXT_ACTION_DECAP) &&
 50	    !reformat_and_fwd) {
 51		NL_SET_ERR_MSG_MOD(extack,
 52				   "Goto chain is not allowed if action has reformat or decap");
 53		return -EOPNOTSUPP;
 54	}
 55
 56	return 0;
 57}
 58
 59static bool
 60tc_act_can_offload_goto(struct mlx5e_tc_act_parse_state *parse_state,
 61			const struct flow_action_entry *act,
 62			int act_index,
 63			struct mlx5_flow_attr *attr)
 64{
 65	struct netlink_ext_ack *extack = parse_state->extack;
 66	struct mlx5e_tc_flow *flow = parse_state->flow;
 67
 68	if (validate_goto_chain(flow->priv, flow, attr, act, extack))
 69		return false;
 70
 71	return true;
 72}
 73
 74static int
 75tc_act_parse_goto(struct mlx5e_tc_act_parse_state *parse_state,
 76		  const struct flow_action_entry *act,
 77		  struct mlx5e_priv *priv,
 78		  struct mlx5_flow_attr *attr)
 79{
 80	attr->action |= MLX5_FLOW_CONTEXT_ACTION_FWD_DEST;
 81	attr->dest_chain = act->chain_index;
 82
 83	return 0;
 84}
 85
 86static int
 87tc_act_post_parse_goto(struct mlx5e_tc_act_parse_state *parse_state,
 88		       struct mlx5e_priv *priv,
 89		       struct mlx5_flow_attr *attr)
 90{
 91	struct mlx5e_tc_flow_parse_attr *parse_attr = attr->parse_attr;
 92	struct netlink_ext_ack *extack = parse_state->extack;
 93	struct mlx5e_tc_flow *flow = parse_state->flow;
 94
 95	if (!attr->dest_chain)
 96		return 0;
 97
 98	if (parse_state->decap) {
 99		/* It can be supported if we'll create a mapping for
100		 * the tunnel device only (without tunnel), and set
101		 * this tunnel id with this decap flow.
102		 *
103		 * On restore (miss), we'll just set this saved tunnel
104		 * device.
105		 */
106
107		NL_SET_ERR_MSG_MOD(extack, "Decap with goto isn't supported");
108		netdev_warn(priv->netdev, "Decap with goto isn't supported");
109		return -EOPNOTSUPP;
110	}
111
112	if (!mlx5e_is_eswitch_flow(flow) && parse_attr->mirred_ifindex[0]) {
113		NL_SET_ERR_MSG_MOD(extack, "Mirroring goto chain rules isn't supported");
114		return -EOPNOTSUPP;
115	}
116
117	return 0;
118}
119
120struct mlx5e_tc_act mlx5e_tc_act_goto = {
121	.can_offload = tc_act_can_offload_goto,
122	.parse_action = tc_act_parse_goto,
123	.post_parse = tc_act_post_parse_goto,
124	.is_terminating_action = true,
125};