1// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
2/* Copyright (c) 2018 Mellanox Technologies. */
3
4#include <net/bareudp.h>
5#include <net/mpls.h>
6#include "en/tc_tun.h"
7
8static bool can_offload(struct mlx5e_priv *priv)
9{
10	return MLX5_CAP_ESW_FLOWTABLE_FDB(priv->mdev, reformat_l3_tunnel_to_l2);
11}
12
13static int calc_hlen(struct mlx5e_encap_entry *e)
14{
15	return sizeof(struct udphdr) + MPLS_HLEN;
16}
17
18static int init_encap_attr(struct net_device *tunnel_dev,
19			   struct mlx5e_priv *priv,
20			   struct mlx5e_encap_entry *e,
21			   struct netlink_ext_ack *extack)
22{
23	e->tunnel = &mplsoudp_tunnel;
24	e->reformat_type = MLX5_REFORMAT_TYPE_L2_TO_L3_TUNNEL;
25	return 0;
26}
27
28static int generate_ip_tun_hdr(char buf[],
29			       __u8 *ip_proto,
30			       struct mlx5e_encap_entry *r)
31{
32	const struct ip_tunnel_key *tun_key = &r->tun_info->key;
33	const struct mlx5e_mpls_info *mpls_info = &r->mpls_info;
34	struct udphdr *udp = (struct udphdr *)(buf);
35	struct mpls_shim_hdr *mpls;
36
37	mpls = (struct mpls_shim_hdr *)(udp + 1);
38	*ip_proto = IPPROTO_UDP;
39
40	udp->dest = tun_key->tp_dst;
41	*mpls = mpls_entry_encode(mpls_info->label, mpls_info->ttl, mpls_info->tc, mpls_info->bos);
42
43	return 0;
44}
45
46static int parse_udp_ports(struct mlx5e_priv *priv,
47			   struct mlx5_flow_spec *spec,
48			   struct flow_cls_offload *f,
49			   void *headers_c,
50			   void *headers_v)
51{
52	return mlx5e_tc_tun_parse_udp_ports(priv, spec, f, headers_c, headers_v);
53}
54
55static int parse_tunnel(struct mlx5e_priv *priv,
56			struct mlx5_flow_spec *spec,
57			struct flow_cls_offload *f,
58			void *headers_c,
59			void *headers_v)
60{
61	struct flow_rule *rule = flow_cls_offload_flow_rule(f);
62	struct flow_match_mpls match;
63	void *misc2_c;
64	void *misc2_v;
65
66	if (!MLX5_CAP_ETH(priv->mdev, tunnel_stateless_mpls_over_udp) &&
67	    !(MLX5_CAP_GEN(priv->mdev, flex_parser_protocols) & MLX5_FLEX_PROTO_CW_MPLS_UDP))
68		return -EOPNOTSUPP;
69
70	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ENC_KEYID))
71		return -EOPNOTSUPP;
72
73	if (!flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_MPLS))
74		return 0;
75
76	flow_rule_match_mpls(rule, &match);
77
78	/* Only support matching the first LSE */
79	if (match.mask->used_lses != 1)
80		return -EOPNOTSUPP;
81
82	misc2_c = MLX5_ADDR_OF(fte_match_param, spec->match_criteria,
83			       misc_parameters_2);
84	misc2_v = MLX5_ADDR_OF(fte_match_param, spec->match_value,
85			       misc_parameters_2);
86
87	MLX5_SET(fte_match_set_misc2, misc2_c,
88		 outer_first_mpls_over_udp.mpls_label,
89		 match.mask->ls[0].mpls_label);
90	MLX5_SET(fte_match_set_misc2, misc2_v,
91		 outer_first_mpls_over_udp.mpls_label,
92		 match.key->ls[0].mpls_label);
93
94	MLX5_SET(fte_match_set_misc2, misc2_c,
95		 outer_first_mpls_over_udp.mpls_exp,
96		 match.mask->ls[0].mpls_tc);
97	MLX5_SET(fte_match_set_misc2, misc2_v,
98		 outer_first_mpls_over_udp.mpls_exp, match.key->ls[0].mpls_tc);
99
100	MLX5_SET(fte_match_set_misc2, misc2_c,
101		 outer_first_mpls_over_udp.mpls_s_bos,
102		 match.mask->ls[0].mpls_bos);
103	MLX5_SET(fte_match_set_misc2, misc2_v,
104		 outer_first_mpls_over_udp.mpls_s_bos,
105		 match.key->ls[0].mpls_bos);
106
107	MLX5_SET(fte_match_set_misc2, misc2_c,
108		 outer_first_mpls_over_udp.mpls_ttl,
109		 match.mask->ls[0].mpls_ttl);
110	MLX5_SET(fte_match_set_misc2, misc2_v,
111		 outer_first_mpls_over_udp.mpls_ttl,
112		 match.key->ls[0].mpls_ttl);
113	spec->match_criteria_enable |= MLX5_MATCH_MISC_PARAMETERS_2;
114
115	return 0;
116}
117
118struct mlx5e_tc_tunnel mplsoudp_tunnel = {
119	.tunnel_type          = MLX5E_TC_TUNNEL_TYPE_MPLSOUDP,
120	.match_level          = MLX5_MATCH_L4,
121	.can_offload          = can_offload,
122	.calc_hlen            = calc_hlen,
123	.init_encap_attr      = init_encap_attr,
124	.generate_ip_tun_hdr  = generate_ip_tun_hdr,
125	.parse_udp_ports      = parse_udp_ports,
126	.parse_tunnel         = parse_tunnel,
127	.encap_info_equal     = mlx5e_tc_tun_encap_info_equal_generic,
128};
129