1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 2 /* Copyright (c) 2018 Mellanox Technologies. All rights reserved */ 3 4 #include <linux/netdevice.h> 5 #include <linux/netlink.h> 6 #include <linux/random.h> 7 #include <net/vxlan.h> 8 9 #include "reg.h" 10 #include "spectrum_nve.h" 11 12 /* Eth (18B) | IPv6 (40B) | UDP (8B) | VxLAN (8B) | Eth (14B) | IPv6 (40B) 13 * 14 * In the worst case - where we have a VLAN tag on the outer Ethernet 15 * header and IPv6 in overlay and underlay - we need to parse 128 bytes 16 */ 17 #define MLXSW_SP_NVE_VXLAN_PARSING_DEPTH 128 18 #define MLXSW_SP_NVE_DEFAULT_PARSING_DEPTH 96 19 20 #define MLXSW_SP_NVE_VXLAN_SUPPORTED_FLAGS (VXLAN_F_UDP_ZERO_CSUM_TX | \ 21 VXLAN_F_LEARN) 22 23 static bool mlxsw_sp1_nve_vxlan_can_offload(const struct mlxsw_sp_nve *nve, 24 const struct net_device *dev, 25 struct netlink_ext_ack *extack) 26 { 27 struct vxlan_dev *vxlan = netdev_priv(dev); 28 struct vxlan_config *cfg = &vxlan->cfg; 29 30 if (cfg->saddr.sa.sa_family != AF_INET) { 31 NL_SET_ERR_MSG_MOD(extack, "VxLAN: Only IPv4 underlay is supported"); 32 return false; 33 } 34 35 if (vxlan_addr_multicast(&cfg->remote_ip)) { 36 NL_SET_ERR_MSG_MOD(extack, "VxLAN: Multicast destination IP is not supported"); 37 return false; 38 } 39 40 if (vxlan_addr_any(&cfg->saddr)) { 41 NL_SET_ERR_MSG_MOD(extack, "VxLAN: Source address must be specified"); 42 return false; 43 } 44 45 if (cfg->remote_ifindex) { 46 NL_SET_ERR_MSG_MOD(extack, "VxLAN: Local interface is not supported"); 47 return false; 48 } 49 50 if (cfg->port_min || cfg->port_max) { 51 NL_SET_ERR_MSG_MOD(extack, "VxLAN: Only default UDP source port range is supported"); 52 return false; 53 } 54 55 if (cfg->tos != 1) { 56 NL_SET_ERR_MSG_MOD(extack, "VxLAN: TOS must be configured to inherit"); 57 return false; 58 } 59 60 if (cfg->flags & VXLAN_F_TTL_INHERIT) { 61 NL_SET_ERR_MSG_MOD(extack, "VxLAN: TTL must not be configured to inherit"); 62 return false; 63 } 64 65 if (!(cfg->flags & VXLAN_F_UDP_ZERO_CSUM_TX)) { 66 NL_SET_ERR_MSG_MOD(extack, "VxLAN: UDP checksum is not supported"); 67 return false; 68 } 69 70 if (cfg->flags & ~MLXSW_SP_NVE_VXLAN_SUPPORTED_FLAGS) { 71 NL_SET_ERR_MSG_MOD(extack, "VxLAN: Unsupported flag"); 72 return false; 73 } 74 75 if (cfg->ttl == 0) { 76 NL_SET_ERR_MSG_MOD(extack, "VxLAN: TTL must not be configured to 0"); 77 return false; 78 } 79 80 if (cfg->label != 0) { 81 NL_SET_ERR_MSG_MOD(extack, "VxLAN: Flow label must be configured to 0"); 82 return false; 83 } 84 85 return true; 86 } 87 88 static void mlxsw_sp_nve_vxlan_config(const struct mlxsw_sp_nve *nve, 89 const struct net_device *dev, 90 struct mlxsw_sp_nve_config *config) 91 { 92 struct vxlan_dev *vxlan = netdev_priv(dev); 93 struct vxlan_config *cfg = &vxlan->cfg; 94 95 config->type = MLXSW_SP_NVE_TYPE_VXLAN; 96 config->ttl = cfg->ttl; 97 config->flowlabel = cfg->label; 98 config->learning_en = cfg->flags & VXLAN_F_LEARN ? 1 : 0; 99 config->ul_tb_id = RT_TABLE_MAIN; 100 config->ul_proto = MLXSW_SP_L3_PROTO_IPV4; 101 config->ul_sip.addr4 = cfg->saddr.sin.sin_addr.s_addr; 102 config->udp_dport = cfg->dst_port; 103 } 104 105 static int mlxsw_sp_nve_parsing_set(struct mlxsw_sp *mlxsw_sp, 106 unsigned int parsing_depth, 107 __be16 udp_dport) 108 { 109 char mprs_pl[MLXSW_REG_MPRS_LEN]; 110 111 mlxsw_reg_mprs_pack(mprs_pl, parsing_depth, be16_to_cpu(udp_dport)); 112 return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(mprs), mprs_pl); 113 } 114 115 static int 116 mlxsw_sp1_nve_vxlan_config_set(struct mlxsw_sp *mlxsw_sp, 117 const struct mlxsw_sp_nve_config *config) 118 { 119 char tngcr_pl[MLXSW_REG_TNGCR_LEN]; 120 u16 ul_vr_id; 121 u8 udp_sport; 122 int err; 123 124 err = mlxsw_sp_router_tb_id_vr_id(mlxsw_sp, config->ul_tb_id, 125 &ul_vr_id); 126 if (err) 127 return err; 128 129 mlxsw_reg_tngcr_pack(tngcr_pl, MLXSW_REG_TNGCR_TYPE_VXLAN, true, 130 config->ttl); 131 /* VxLAN driver's default UDP source port range is 32768 (0x8000) 132 * to 60999 (0xee47). Set the upper 8 bits of the UDP source port 133 * to a random number between 0x80 and 0xee 134 */ 135 get_random_bytes(&udp_sport, sizeof(udp_sport)); 136 udp_sport = (udp_sport % (0xee - 0x80 + 1)) + 0x80; 137 mlxsw_reg_tngcr_nve_udp_sport_prefix_set(tngcr_pl, udp_sport); 138 mlxsw_reg_tngcr_learn_enable_set(tngcr_pl, config->learning_en); 139 mlxsw_reg_tngcr_underlay_virtual_router_set(tngcr_pl, ul_vr_id); 140 mlxsw_reg_tngcr_usipv4_set(tngcr_pl, be32_to_cpu(config->ul_sip.addr4)); 141 142 return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(tngcr), tngcr_pl); 143 } 144 145 static void mlxsw_sp1_nve_vxlan_config_clear(struct mlxsw_sp *mlxsw_sp) 146 { 147 char tngcr_pl[MLXSW_REG_TNGCR_LEN]; 148 149 mlxsw_reg_tngcr_pack(tngcr_pl, MLXSW_REG_TNGCR_TYPE_VXLAN, false, 0); 150 151 mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(tngcr), tngcr_pl); 152 } 153 154 static int mlxsw_sp1_nve_vxlan_rtdp_set(struct mlxsw_sp *mlxsw_sp, 155 unsigned int tunnel_index) 156 { 157 char rtdp_pl[MLXSW_REG_RTDP_LEN]; 158 159 mlxsw_reg_rtdp_pack(rtdp_pl, MLXSW_REG_RTDP_TYPE_NVE, tunnel_index); 160 161 return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(rtdp), rtdp_pl); 162 } 163 164 static int mlxsw_sp1_nve_vxlan_init(struct mlxsw_sp_nve *nve, 165 const struct mlxsw_sp_nve_config *config) 166 { 167 struct mlxsw_sp *mlxsw_sp = nve->mlxsw_sp; 168 int err; 169 170 err = mlxsw_sp_nve_parsing_set(mlxsw_sp, 171 MLXSW_SP_NVE_VXLAN_PARSING_DEPTH, 172 config->udp_dport); 173 if (err) 174 return err; 175 176 err = mlxsw_sp1_nve_vxlan_config_set(mlxsw_sp, config); 177 if (err) 178 goto err_config_set; 179 180 err = mlxsw_sp1_nve_vxlan_rtdp_set(mlxsw_sp, nve->tunnel_index); 181 if (err) 182 goto err_rtdp_set; 183 184 err = mlxsw_sp_router_nve_promote_decap(mlxsw_sp, config->ul_tb_id, 185 config->ul_proto, 186 &config->ul_sip, 187 nve->tunnel_index); 188 if (err) 189 goto err_promote_decap; 190 191 return 0; 192 193 err_promote_decap: 194 err_rtdp_set: 195 mlxsw_sp1_nve_vxlan_config_clear(mlxsw_sp); 196 err_config_set: 197 mlxsw_sp_nve_parsing_set(mlxsw_sp, MLXSW_SP_NVE_DEFAULT_PARSING_DEPTH, 198 config->udp_dport); 199 return err; 200 } 201 202 static void mlxsw_sp1_nve_vxlan_fini(struct mlxsw_sp_nve *nve) 203 { 204 struct mlxsw_sp_nve_config *config = &nve->config; 205 struct mlxsw_sp *mlxsw_sp = nve->mlxsw_sp; 206 207 mlxsw_sp_router_nve_demote_decap(mlxsw_sp, config->ul_tb_id, 208 config->ul_proto, &config->ul_sip); 209 mlxsw_sp1_nve_vxlan_config_clear(mlxsw_sp); 210 mlxsw_sp_nve_parsing_set(mlxsw_sp, MLXSW_SP_NVE_DEFAULT_PARSING_DEPTH, 211 config->udp_dport); 212 } 213 214 static int 215 mlxsw_sp_nve_vxlan_fdb_replay(const struct net_device *nve_dev, __be32 vni) 216 { 217 if (WARN_ON(!netif_is_vxlan(nve_dev))) 218 return -EINVAL; 219 return vxlan_fdb_replay(nve_dev, vni, &mlxsw_sp_switchdev_notifier); 220 } 221 222 static void 223 mlxsw_sp_nve_vxlan_clear_offload(const struct net_device *nve_dev, __be32 vni) 224 { 225 if (WARN_ON(!netif_is_vxlan(nve_dev))) 226 return; 227 vxlan_fdb_clear_offload(nve_dev, vni); 228 } 229 230 const struct mlxsw_sp_nve_ops mlxsw_sp1_nve_vxlan_ops = { 231 .type = MLXSW_SP_NVE_TYPE_VXLAN, 232 .can_offload = mlxsw_sp1_nve_vxlan_can_offload, 233 .nve_config = mlxsw_sp_nve_vxlan_config, 234 .init = mlxsw_sp1_nve_vxlan_init, 235 .fini = mlxsw_sp1_nve_vxlan_fini, 236 .fdb_replay = mlxsw_sp_nve_vxlan_fdb_replay, 237 .fdb_clear_offload = mlxsw_sp_nve_vxlan_clear_offload, 238 }; 239 240 static bool mlxsw_sp2_nve_vxlan_can_offload(const struct mlxsw_sp_nve *nve, 241 const struct net_device *dev, 242 struct netlink_ext_ack *extack) 243 { 244 return false; 245 } 246 247 static int mlxsw_sp2_nve_vxlan_init(struct mlxsw_sp_nve *nve, 248 const struct mlxsw_sp_nve_config *config) 249 { 250 return -EOPNOTSUPP; 251 } 252 253 static void mlxsw_sp2_nve_vxlan_fini(struct mlxsw_sp_nve *nve) 254 { 255 } 256 257 const struct mlxsw_sp_nve_ops mlxsw_sp2_nve_vxlan_ops = { 258 .type = MLXSW_SP_NVE_TYPE_VXLAN, 259 .can_offload = mlxsw_sp2_nve_vxlan_can_offload, 260 .nve_config = mlxsw_sp_nve_vxlan_config, 261 .init = mlxsw_sp2_nve_vxlan_init, 262 .fini = mlxsw_sp2_nve_vxlan_fini, 263 .fdb_replay = mlxsw_sp_nve_vxlan_fdb_replay, 264 .fdb_clear_offload = mlxsw_sp_nve_vxlan_clear_offload, 265 }; 266