1 /*
2 * Copyright (c) 2017 Mellanox Technologies. All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 *
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
17 *
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
31 *
32 */
33
34 #ifndef __MLX5E_IPSEC_RXTX_H__
35 #define __MLX5E_IPSEC_RXTX_H__
36
37 #include <linux/skbuff.h>
38 #include <net/xfrm.h>
39 #include "en.h"
40 #include "en/txrx.h"
41
42 /* Bit31: IPsec marker, Bit30: reserved, Bit29-24: IPsec syndrome, Bit23-0: IPsec obj id */
43 #define MLX5_IPSEC_METADATA_MARKER(metadata) (((metadata) >> 31) & 0x1)
44 #define MLX5_IPSEC_METADATA_SYNDROM(metadata) (((metadata) >> 24) & GENMASK(5, 0))
45 #define MLX5_IPSEC_METADATA_HANDLE(metadata) ((metadata) & GENMASK(23, 0))
46 #define MLX5_IPSEC_METADATA_CREATE(id, syndrome) ((id) | ((syndrome) << 24))
47
48 struct mlx5e_accel_tx_ipsec_state {
49 struct xfrm_offload *xo;
50 struct xfrm_state *x;
51 u32 tailen;
52 u32 plen;
53 };
54
55 #ifdef CONFIG_MLX5_EN_IPSEC
56
57 void mlx5e_ipsec_set_iv_esn(struct sk_buff *skb, struct xfrm_state *x,
58 struct xfrm_offload *xo);
59 void mlx5e_ipsec_set_iv(struct sk_buff *skb, struct xfrm_state *x,
60 struct xfrm_offload *xo);
61 bool mlx5e_ipsec_handle_tx_skb(struct net_device *netdev,
62 struct sk_buff *skb,
63 struct mlx5e_accel_tx_ipsec_state *ipsec_st);
64 void mlx5e_ipsec_handle_tx_wqe(struct mlx5e_tx_wqe *wqe,
65 struct mlx5e_accel_tx_ipsec_state *ipsec_st,
66 struct mlx5_wqe_inline_seg *inlseg);
67 void mlx5e_ipsec_offload_handle_rx_skb(struct net_device *netdev,
68 struct sk_buff *skb,
69 u32 ipsec_meta_data);
70 int mlx5_esw_ipsec_rx_make_metadata(struct mlx5e_priv *priv, u32 id, u32 *metadata);
mlx5e_ipsec_tx_ids_len(struct mlx5e_accel_tx_ipsec_state * ipsec_st)71 static inline unsigned int mlx5e_ipsec_tx_ids_len(struct mlx5e_accel_tx_ipsec_state *ipsec_st)
72 {
73 return ipsec_st->tailen;
74 }
75
mlx5_ipsec_is_rx_flow(struct mlx5_cqe64 * cqe)76 static inline bool mlx5_ipsec_is_rx_flow(struct mlx5_cqe64 *cqe)
77 {
78 return MLX5_IPSEC_METADATA_MARKER(be32_to_cpu(cqe->ft_metadata));
79 }
80
mlx5e_ipsec_eseg_meta(struct mlx5_wqe_eth_seg * eseg)81 static inline bool mlx5e_ipsec_eseg_meta(struct mlx5_wqe_eth_seg *eseg)
82 {
83 return eseg->flow_table_metadata & cpu_to_be32(MLX5_ETH_WQE_FT_META_IPSEC);
84 }
85
86 void mlx5e_ipsec_tx_build_eseg(struct mlx5e_priv *priv, struct sk_buff *skb,
87 struct mlx5_wqe_eth_seg *eseg);
88
89 static inline netdev_features_t
mlx5e_ipsec_feature_check(struct sk_buff * skb,netdev_features_t features)90 mlx5e_ipsec_feature_check(struct sk_buff *skb, netdev_features_t features)
91 {
92 struct xfrm_offload *xo = xfrm_offload(skb);
93 struct sec_path *sp = skb_sec_path(skb);
94
95 if (sp && sp->len && xo) {
96 struct xfrm_state *x = sp->xvec[0];
97
98 if (!x || !x->xso.offload_handle)
99 goto out_disable;
100
101 if (xo->inner_ipproto) {
102 /* Cannot support tunnel packet over IPsec tunnel mode
103 * because we cannot offload three IP header csum
104 */
105 if (x->props.mode == XFRM_MODE_TUNNEL)
106 goto out_disable;
107
108 /* Only support UDP or TCP L4 checksum */
109 if (xo->inner_ipproto != IPPROTO_UDP &&
110 xo->inner_ipproto != IPPROTO_TCP)
111 goto out_disable;
112 }
113
114 return features;
115
116 }
117
118 /* Disable CSUM and GSO for software IPsec */
119 out_disable:
120 return features & ~(NETIF_F_CSUM_MASK | NETIF_F_GSO_MASK);
121 }
122
123 static inline bool
mlx5e_ipsec_txwqe_build_eseg_csum(struct mlx5e_txqsq * sq,struct sk_buff * skb,struct mlx5_wqe_eth_seg * eseg)124 mlx5e_ipsec_txwqe_build_eseg_csum(struct mlx5e_txqsq *sq, struct sk_buff *skb,
125 struct mlx5_wqe_eth_seg *eseg)
126 {
127 u8 inner_ipproto;
128
129 if (!mlx5e_ipsec_eseg_meta(eseg))
130 return false;
131
132 eseg->cs_flags = MLX5_ETH_WQE_L3_CSUM;
133 inner_ipproto = xfrm_offload(skb)->inner_ipproto;
134 if (inner_ipproto) {
135 eseg->cs_flags |= MLX5_ETH_WQE_L3_INNER_CSUM;
136 if (inner_ipproto == IPPROTO_TCP || inner_ipproto == IPPROTO_UDP)
137 eseg->cs_flags |= MLX5_ETH_WQE_L4_INNER_CSUM;
138 } else if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
139 eseg->cs_flags |= MLX5_ETH_WQE_L4_CSUM;
140 sq->stats->csum_partial_inner++;
141 }
142
143 return true;
144 }
145 #else
146 static inline
mlx5e_ipsec_offload_handle_rx_skb(struct net_device * netdev,struct sk_buff * skb,u32 ipsec_meta_data)147 void mlx5e_ipsec_offload_handle_rx_skb(struct net_device *netdev,
148 struct sk_buff *skb,
149 u32 ipsec_meta_data)
150 {}
151
mlx5e_ipsec_eseg_meta(struct mlx5_wqe_eth_seg * eseg)152 static inline bool mlx5e_ipsec_eseg_meta(struct mlx5_wqe_eth_seg *eseg)
153 {
154 return false;
155 }
156
mlx5_ipsec_is_rx_flow(struct mlx5_cqe64 * cqe)157 static inline bool mlx5_ipsec_is_rx_flow(struct mlx5_cqe64 *cqe) { return false; }
158 static inline netdev_features_t
mlx5e_ipsec_feature_check(struct sk_buff * skb,netdev_features_t features)159 mlx5e_ipsec_feature_check(struct sk_buff *skb, netdev_features_t features)
160 { return features & ~(NETIF_F_CSUM_MASK | NETIF_F_GSO_MASK); }
161
162 static inline bool
mlx5e_ipsec_txwqe_build_eseg_csum(struct mlx5e_txqsq * sq,struct sk_buff * skb,struct mlx5_wqe_eth_seg * eseg)163 mlx5e_ipsec_txwqe_build_eseg_csum(struct mlx5e_txqsq *sq, struct sk_buff *skb,
164 struct mlx5_wqe_eth_seg *eseg)
165 {
166 return false;
167 }
168 #endif /* CONFIG_MLX5_EN_IPSEC */
169
170 #endif /* __MLX5E_IPSEC_RXTX_H__ */
171