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 47 struct mlx5e_accel_tx_ipsec_state { 48 struct xfrm_offload *xo; 49 struct xfrm_state *x; 50 u32 tailen; 51 u32 plen; 52 }; 53 54 #ifdef CONFIG_MLX5_EN_IPSEC 55 56 void mlx5e_ipsec_inverse_table_init(void); 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 struct mlx5_cqe64 *cqe); 70 static inline unsigned int mlx5e_ipsec_tx_ids_len(struct mlx5e_accel_tx_ipsec_state *ipsec_st) 71 { 72 return ipsec_st->tailen; 73 } 74 75 static inline bool mlx5_ipsec_is_rx_flow(struct mlx5_cqe64 *cqe) 76 { 77 return MLX5_IPSEC_METADATA_MARKER(be32_to_cpu(cqe->ft_metadata)); 78 } 79 80 static inline bool mlx5e_ipsec_eseg_meta(struct mlx5_wqe_eth_seg *eseg) 81 { 82 return eseg->flow_table_metadata & cpu_to_be32(MLX5_ETH_WQE_FT_META_IPSEC); 83 } 84 85 void mlx5e_ipsec_tx_build_eseg(struct mlx5e_priv *priv, struct sk_buff *skb, 86 struct mlx5_wqe_eth_seg *eseg); 87 88 static inline netdev_features_t 89 mlx5e_ipsec_feature_check(struct sk_buff *skb, netdev_features_t features) 90 { 91 struct xfrm_offload *xo = xfrm_offload(skb); 92 struct sec_path *sp = skb_sec_path(skb); 93 94 if (sp && sp->len && xo) { 95 struct xfrm_state *x = sp->xvec[0]; 96 97 if (!x || !x->xso.offload_handle) 98 goto out_disable; 99 100 if (xo->inner_ipproto) { 101 /* Cannot support tunnel packet over IPsec tunnel mode 102 * because we cannot offload three IP header csum 103 */ 104 if (x->props.mode == XFRM_MODE_TUNNEL) 105 goto out_disable; 106 107 /* Only support UDP or TCP L4 checksum */ 108 if (xo->inner_ipproto != IPPROTO_UDP && 109 xo->inner_ipproto != IPPROTO_TCP) 110 goto out_disable; 111 } 112 113 return features; 114 115 } 116 117 /* Disable CSUM and GSO for software IPsec */ 118 out_disable: 119 return features & ~(NETIF_F_CSUM_MASK | NETIF_F_GSO_MASK); 120 } 121 122 static inline bool 123 mlx5e_ipsec_txwqe_build_eseg_csum(struct mlx5e_txqsq *sq, struct sk_buff *skb, 124 struct mlx5_wqe_eth_seg *eseg) 125 { 126 u8 inner_ipproto; 127 128 if (!mlx5e_ipsec_eseg_meta(eseg)) 129 return false; 130 131 eseg->cs_flags = MLX5_ETH_WQE_L3_CSUM; 132 inner_ipproto = xfrm_offload(skb)->inner_ipproto; 133 if (inner_ipproto) { 134 eseg->cs_flags |= MLX5_ETH_WQE_L3_INNER_CSUM; 135 if (inner_ipproto == IPPROTO_TCP || inner_ipproto == IPPROTO_UDP) 136 eseg->cs_flags |= MLX5_ETH_WQE_L4_INNER_CSUM; 137 } else if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) { 138 eseg->cs_flags |= MLX5_ETH_WQE_L4_CSUM; 139 sq->stats->csum_partial_inner++; 140 } 141 142 return true; 143 } 144 #else 145 static inline 146 void mlx5e_ipsec_offload_handle_rx_skb(struct net_device *netdev, 147 struct sk_buff *skb, 148 struct mlx5_cqe64 *cqe) 149 {} 150 151 static inline bool mlx5e_ipsec_eseg_meta(struct mlx5_wqe_eth_seg *eseg) 152 { 153 return false; 154 } 155 156 static inline bool mlx5_ipsec_is_rx_flow(struct mlx5_cqe64 *cqe) { return false; } 157 static inline netdev_features_t 158 mlx5e_ipsec_feature_check(struct sk_buff *skb, netdev_features_t features) 159 { return features & ~(NETIF_F_CSUM_MASK | NETIF_F_GSO_MASK); } 160 161 static inline bool 162 mlx5e_ipsec_txwqe_build_eseg_csum(struct mlx5e_txqsq *sq, struct sk_buff *skb, 163 struct mlx5_wqe_eth_seg *eseg) 164 { 165 return false; 166 } 167 #endif /* CONFIG_MLX5_EN_IPSEC */ 168 169 #endif /* __MLX5E_IPSEC_RXTX_H__ */ 170