1 /* 2 * drivers/net/ethernet/mellanox/mlxsw/spectrum_ipip.c 3 * Copyright (c) 2017 Mellanox Technologies. All rights reserved. 4 * Copyright (c) 2017 Petr Machata <petrm@mellanox.com> 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions are met: 8 * 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. Neither the names of the copyright holders nor the names of its 15 * contributors may be used to endorse or promote products derived from 16 * this software without specific prior written permission. 17 * 18 * Alternatively, this software may be distributed under the terms of the 19 * GNU General Public License ("GPL") version 2 as published by the Free 20 * Software Foundation. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 23 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 26 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 32 * POSSIBILITY OF SUCH DAMAGE. 33 */ 34 35 #include <net/ip_tunnels.h> 36 37 #include "spectrum_ipip.h" 38 39 static bool 40 mlxsw_sp_ipip_netdev_has_ikey(const struct net_device *ol_dev) 41 { 42 struct ip_tunnel *tun = netdev_priv(ol_dev); 43 44 return !!(tun->parms.i_flags & TUNNEL_KEY); 45 } 46 47 static bool 48 mlxsw_sp_ipip_netdev_has_okey(const struct net_device *ol_dev) 49 { 50 struct ip_tunnel *tun = netdev_priv(ol_dev); 51 52 return !!(tun->parms.o_flags & TUNNEL_KEY); 53 } 54 55 static u32 mlxsw_sp_ipip_netdev_ikey(const struct net_device *ol_dev) 56 { 57 struct ip_tunnel *tun = netdev_priv(ol_dev); 58 59 return mlxsw_sp_ipip_netdev_has_ikey(ol_dev) ? 60 be32_to_cpu(tun->parms.i_key) : 0; 61 } 62 63 static u32 mlxsw_sp_ipip_netdev_okey(const struct net_device *ol_dev) 64 { 65 struct ip_tunnel *tun = netdev_priv(ol_dev); 66 67 return mlxsw_sp_ipip_netdev_has_okey(ol_dev) ? 68 be32_to_cpu(tun->parms.o_key) : 0; 69 } 70 71 static int 72 mlxsw_sp_ipip_nexthop_update_gre4(struct mlxsw_sp *mlxsw_sp, u32 adj_index, 73 struct mlxsw_sp_ipip_entry *ipip_entry) 74 { 75 u16 rif_index = mlxsw_sp_ipip_lb_rif_index(ipip_entry->ol_lb); 76 __be32 daddr4 = mlxsw_sp_ipip_netdev_daddr4(ipip_entry->ol_dev); 77 char ratr_pl[MLXSW_REG_RATR_LEN]; 78 79 mlxsw_reg_ratr_pack(ratr_pl, MLXSW_REG_RATR_OP_WRITE_WRITE_ENTRY, 80 true, MLXSW_REG_RATR_TYPE_IPIP, 81 adj_index, rif_index); 82 mlxsw_reg_ratr_ipip4_entry_pack(ratr_pl, be32_to_cpu(daddr4)); 83 84 return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(ratr), ratr_pl); 85 } 86 87 static int 88 mlxsw_sp_ipip_fib_entry_op_gre4_rtdp(struct mlxsw_sp *mlxsw_sp, 89 u32 tunnel_index, 90 struct mlxsw_sp_ipip_entry *ipip_entry) 91 { 92 bool has_ikey = mlxsw_sp_ipip_netdev_has_ikey(ipip_entry->ol_dev); 93 u16 rif_index = mlxsw_sp_ipip_lb_rif_index(ipip_entry->ol_lb); 94 u32 ikey = mlxsw_sp_ipip_netdev_ikey(ipip_entry->ol_dev); 95 char rtdp_pl[MLXSW_REG_RTDP_LEN]; 96 unsigned int type_check; 97 u32 daddr4; 98 99 mlxsw_reg_rtdp_pack(rtdp_pl, MLXSW_REG_RTDP_TYPE_IPIP, tunnel_index); 100 101 type_check = has_ikey ? 102 MLXSW_REG_RTDP_IPIP_TYPE_CHECK_ALLOW_GRE_KEY : 103 MLXSW_REG_RTDP_IPIP_TYPE_CHECK_ALLOW_GRE; 104 105 /* Linux demuxes tunnels based on packet SIP (which must match tunnel 106 * remote IP). Thus configure decap so that it filters out packets that 107 * are not IPv4 or have the wrong SIP. IPIP_DECAP_ERROR trap is 108 * generated for packets that fail this criterion. Linux then handles 109 * such packets in slow path and generates ICMP destination unreachable. 110 */ 111 daddr4 = be32_to_cpu(mlxsw_sp_ipip_netdev_daddr4(ipip_entry->ol_dev)); 112 mlxsw_reg_rtdp_ipip4_pack(rtdp_pl, rif_index, 113 MLXSW_REG_RTDP_IPIP_SIP_CHECK_FILTER_IPV4, 114 type_check, has_ikey, daddr4, ikey); 115 116 return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(rtdp), rtdp_pl); 117 } 118 119 static int 120 mlxsw_sp_ipip_fib_entry_op_gre4_ralue(struct mlxsw_sp *mlxsw_sp, 121 u32 dip, u8 prefix_len, u16 ul_vr_id, 122 enum mlxsw_reg_ralue_op op, 123 u32 tunnel_index) 124 { 125 char ralue_pl[MLXSW_REG_RALUE_LEN]; 126 127 mlxsw_reg_ralue_pack4(ralue_pl, MLXSW_REG_RALXX_PROTOCOL_IPV4, op, 128 ul_vr_id, prefix_len, dip); 129 mlxsw_reg_ralue_act_ip2me_tun_pack(ralue_pl, tunnel_index); 130 return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(ralue), ralue_pl); 131 } 132 133 static int mlxsw_sp_ipip_fib_entry_op_gre4(struct mlxsw_sp *mlxsw_sp, 134 struct mlxsw_sp_ipip_entry *ipip_entry, 135 enum mlxsw_reg_ralue_op op, 136 u32 tunnel_index) 137 { 138 u16 ul_vr_id = mlxsw_sp_ipip_lb_ul_vr_id(ipip_entry->ol_lb); 139 __be32 dip; 140 int err; 141 142 err = mlxsw_sp_ipip_fib_entry_op_gre4_rtdp(mlxsw_sp, tunnel_index, 143 ipip_entry); 144 if (err) 145 return err; 146 147 dip = mlxsw_sp_ipip_netdev_saddr(MLXSW_SP_L3_PROTO_IPV4, 148 ipip_entry->ol_dev).addr4; 149 return mlxsw_sp_ipip_fib_entry_op_gre4_ralue(mlxsw_sp, be32_to_cpu(dip), 150 32, ul_vr_id, op, 151 tunnel_index); 152 } 153 154 static bool mlxsw_sp_ipip_tunnel_complete(enum mlxsw_sp_l3proto proto, 155 const struct net_device *ol_dev) 156 { 157 union mlxsw_sp_l3addr saddr = mlxsw_sp_ipip_netdev_saddr(proto, ol_dev); 158 union mlxsw_sp_l3addr daddr = mlxsw_sp_ipip_netdev_daddr(proto, ol_dev); 159 union mlxsw_sp_l3addr naddr = {0}; 160 161 /* Tunnels with unset local or remote address are valid in Linux and 162 * used for lightweight tunnels (LWT) and Non-Broadcast Multi-Access 163 * (NBMA) tunnels. In principle these can be offloaded, but the driver 164 * currently doesn't support this. So punt. 165 */ 166 return memcmp(&saddr, &naddr, sizeof(naddr)) && 167 memcmp(&daddr, &naddr, sizeof(naddr)); 168 } 169 170 static bool mlxsw_sp_ipip_can_offload_gre4(const struct mlxsw_sp *mlxsw_sp, 171 const struct net_device *ol_dev, 172 enum mlxsw_sp_l3proto ol_proto) 173 { 174 struct ip_tunnel *tunnel = netdev_priv(ol_dev); 175 __be16 okflags = TUNNEL_KEY; /* We can't offload any other features. */ 176 bool inherit_ttl = tunnel->parms.iph.ttl == 0; 177 bool inherit_tos = tunnel->parms.iph.tos & 0x1; 178 179 return (tunnel->parms.i_flags & ~okflags) == 0 && 180 (tunnel->parms.o_flags & ~okflags) == 0 && 181 inherit_ttl && inherit_tos && 182 mlxsw_sp_ipip_tunnel_complete(MLXSW_SP_L3_PROTO_IPV4, ol_dev); 183 } 184 185 static struct mlxsw_sp_rif_ipip_lb_config 186 mlxsw_sp_ipip_ol_loopback_config_gre4(struct mlxsw_sp *mlxsw_sp, 187 const struct net_device *ol_dev) 188 { 189 enum mlxsw_reg_ritr_loopback_ipip_type lb_ipipt; 190 191 lb_ipipt = mlxsw_sp_ipip_netdev_has_okey(ol_dev) ? 192 MLXSW_REG_RITR_LOOPBACK_IPIP_TYPE_IP_IN_GRE_KEY_IN_IP : 193 MLXSW_REG_RITR_LOOPBACK_IPIP_TYPE_IP_IN_GRE_IN_IP; 194 return (struct mlxsw_sp_rif_ipip_lb_config){ 195 .lb_ipipt = lb_ipipt, 196 .okey = mlxsw_sp_ipip_netdev_okey(ol_dev), 197 .ul_protocol = MLXSW_SP_L3_PROTO_IPV4, 198 .saddr = mlxsw_sp_ipip_netdev_saddr(MLXSW_SP_L3_PROTO_IPV4, 199 ol_dev), 200 }; 201 } 202 203 static const struct mlxsw_sp_ipip_ops mlxsw_sp_ipip_gre4_ops = { 204 .dev_type = ARPHRD_IPGRE, 205 .ul_proto = MLXSW_SP_L3_PROTO_IPV4, 206 .nexthop_update = mlxsw_sp_ipip_nexthop_update_gre4, 207 .fib_entry_op = mlxsw_sp_ipip_fib_entry_op_gre4, 208 .can_offload = mlxsw_sp_ipip_can_offload_gre4, 209 .ol_loopback_config = mlxsw_sp_ipip_ol_loopback_config_gre4, 210 }; 211 212 const struct mlxsw_sp_ipip_ops *mlxsw_sp_ipip_ops_arr[] = { 213 [MLXSW_SP_IPIP_TYPE_GRE4] = &mlxsw_sp_ipip_gre4_ops, 214 }; 215