1 // SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
2 /* Copyright (c) 2018 Mellanox Technologies. */
3
4 #include <net/gre.h>
5 #include "en/tc_tun.h"
6
mlx5e_tc_tun_can_offload_gretap(struct mlx5e_priv * priv)7 static bool mlx5e_tc_tun_can_offload_gretap(struct mlx5e_priv *priv)
8 {
9 return !!MLX5_CAP_ESW(priv->mdev, nvgre_encap_decap);
10 }
11
mlx5e_tc_tun_calc_hlen_gretap(struct mlx5e_encap_entry * e)12 static int mlx5e_tc_tun_calc_hlen_gretap(struct mlx5e_encap_entry *e)
13 {
14 return gre_calc_hlen(e->tun_info->key.tun_flags);
15 }
16
mlx5e_tc_tun_init_encap_attr_gretap(struct net_device * tunnel_dev,struct mlx5e_priv * priv,struct mlx5e_encap_entry * e,struct netlink_ext_ack * extack)17 static int mlx5e_tc_tun_init_encap_attr_gretap(struct net_device *tunnel_dev,
18 struct mlx5e_priv *priv,
19 struct mlx5e_encap_entry *e,
20 struct netlink_ext_ack *extack)
21 {
22 e->tunnel = &gre_tunnel;
23 e->reformat_type = MLX5_REFORMAT_TYPE_L2_TO_NVGRE;
24 return 0;
25 }
26
mlx5e_gen_ip_tunnel_header_gretap(char buf[],__u8 * ip_proto,struct mlx5e_encap_entry * e)27 static int mlx5e_gen_ip_tunnel_header_gretap(char buf[],
28 __u8 *ip_proto,
29 struct mlx5e_encap_entry *e)
30 {
31 const struct ip_tunnel_key *tun_key = &e->tun_info->key;
32 struct gre_base_hdr *greh = (struct gre_base_hdr *)(buf);
33 __be32 tun_id = tunnel_id_to_key32(tun_key->tun_id);
34 int hdr_len;
35
36 *ip_proto = IPPROTO_GRE;
37
38 /* the HW does not calculate GRE csum or sequences */
39 if (tun_key->tun_flags & (TUNNEL_CSUM | TUNNEL_SEQ))
40 return -EOPNOTSUPP;
41
42 greh->protocol = htons(ETH_P_TEB);
43
44 /* GRE key */
45 hdr_len = mlx5e_tc_tun_calc_hlen_gretap(e);
46 greh->flags = gre_tnl_flags_to_gre_flags(tun_key->tun_flags);
47 if (tun_key->tun_flags & TUNNEL_KEY) {
48 __be32 *ptr = (__be32 *)(((u8 *)greh) + hdr_len - 4);
49 *ptr = tun_id;
50 }
51
52 return 0;
53 }
54
mlx5e_tc_tun_parse_gretap(struct mlx5e_priv * priv,struct mlx5_flow_spec * spec,struct flow_cls_offload * f,void * headers_c,void * headers_v)55 static int mlx5e_tc_tun_parse_gretap(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 void *misc_c = MLX5_ADDR_OF(fte_match_param, spec->match_criteria, misc_parameters);
62 void *misc_v = MLX5_ADDR_OF(fte_match_param, spec->match_value, misc_parameters);
63 struct flow_rule *rule = flow_cls_offload_flow_rule(f);
64
65 MLX5_SET_TO_ONES(fte_match_set_lyr_2_4, headers_c, ip_protocol);
66 MLX5_SET(fte_match_set_lyr_2_4, headers_v, ip_protocol, IPPROTO_GRE);
67
68 /* gre protocol */
69 MLX5_SET_TO_ONES(fte_match_set_misc, misc_c, gre_protocol);
70 MLX5_SET(fte_match_set_misc, misc_v, gre_protocol, ETH_P_TEB);
71
72 /* gre key */
73 if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ENC_KEYID)) {
74 struct flow_match_enc_keyid enc_keyid;
75
76 flow_rule_match_enc_keyid(rule, &enc_keyid);
77 MLX5_SET(fte_match_set_misc, misc_c,
78 gre_key.key, be32_to_cpu(enc_keyid.mask->keyid));
79 MLX5_SET(fte_match_set_misc, misc_v,
80 gre_key.key, be32_to_cpu(enc_keyid.key->keyid));
81 }
82
83 spec->match_criteria_enable |= MLX5_MATCH_MISC_PARAMETERS;
84
85 return 0;
86 }
87
88 struct mlx5e_tc_tunnel gre_tunnel = {
89 .tunnel_type = MLX5E_TC_TUNNEL_TYPE_GRETAP,
90 .match_level = MLX5_MATCH_L3,
91 .can_offload = mlx5e_tc_tun_can_offload_gretap,
92 .calc_hlen = mlx5e_tc_tun_calc_hlen_gretap,
93 .init_encap_attr = mlx5e_tc_tun_init_encap_attr_gretap,
94 .generate_ip_tun_hdr = mlx5e_gen_ip_tunnel_header_gretap,
95 .parse_udp_ports = NULL,
96 .parse_tunnel = mlx5e_tc_tun_parse_gretap,
97 .encap_info_equal = mlx5e_tc_tun_encap_info_equal_generic,
98 };
99