1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause OR GPL-2.0 3 * 4 * Copyright (c) 2005 Voltaire Inc. All rights reserved. 5 * Copyright (c) 2005 Intel Corporation. All rights reserved. 6 * 7 * This software is available to you under a choice of one of two 8 * licenses. You may choose to be licensed under the terms of the GNU 9 * General Public License (GPL) Version 2, available from the file 10 * COPYING in the main directory of this source tree, or the 11 * OpenIB.org BSD license below: 12 * 13 * Redistribution and use in source and binary forms, with or 14 * without modification, are permitted provided that the following 15 * conditions are met: 16 * 17 * - Redistributions of source code must retain the above 18 * copyright notice, this list of conditions and the following 19 * disclaimer. 20 * 21 * - Redistributions in binary form must reproduce the above 22 * copyright notice, this list of conditions and the following 23 * disclaimer in the documentation and/or other materials 24 * provided with the distribution. 25 * 26 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 27 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 28 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 29 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 30 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 31 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 32 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 33 * SOFTWARE. 34 */ 35 36 #if !defined(IB_ADDR_H) 37 #define IB_ADDR_H 38 39 #include <linux/in.h> 40 #include <linux/in6.h> 41 #include <linux/if_arp.h> 42 #include <linux/netdevice.h> 43 #include <linux/inetdevice.h> 44 #include <linux/socket.h> 45 #include <linux/if_vlan.h> 46 #include <net/ipv6.h> 47 #include <net/if_inet6.h> 48 #include <net/ip.h> 49 #include <rdma/ib_verbs.h> 50 #include <rdma/ib_pack.h> 51 #include <net/ipv6.h> 52 53 struct rdma_addr_client { 54 atomic_t refcount; 55 struct completion comp; 56 }; 57 58 /** 59 * rdma_addr_register_client - Register an address client. 60 */ 61 void rdma_addr_register_client(struct rdma_addr_client *client); 62 63 /** 64 * rdma_addr_unregister_client - Deregister an address client. 65 * @client: Client object to deregister. 66 */ 67 void rdma_addr_unregister_client(struct rdma_addr_client *client); 68 69 /** 70 * struct rdma_dev_addr - Contains resolved RDMA hardware addresses 71 * @src_dev_addr: Source MAC address. 72 * @dst_dev_addr: Destination MAC address. 73 * @broadcast: Broadcast address of the device. 74 * @dev_type: The interface hardware type of the device. 75 * @bound_dev_if: An optional device interface index. 76 * @transport: The transport type used. 77 * @net: Network namespace containing the bound_dev_if net_dev. 78 */ 79 struct vnet; 80 struct rdma_dev_addr { 81 unsigned char src_dev_addr[MAX_ADDR_LEN]; 82 unsigned char dst_dev_addr[MAX_ADDR_LEN]; 83 unsigned char broadcast[MAX_ADDR_LEN]; 84 unsigned short dev_type; 85 int bound_dev_if; 86 enum rdma_transport_type transport; 87 struct vnet *net; 88 enum rdma_network_type network; 89 int hoplimit; 90 }; 91 92 /** 93 * rdma_translate_ip - Translate a local IP address to an RDMA hardware 94 * address. 95 * 96 * The dev_addr->net field must be initialized. 97 */ 98 int rdma_translate_ip(const struct sockaddr *addr, 99 struct rdma_dev_addr *dev_addr, u16 *vlan_id); 100 101 /** 102 * rdma_resolve_ip - Resolve source and destination IP addresses to 103 * RDMA hardware addresses. 104 * @client: Address client associated with request. 105 * @src_addr: An optional source address to use in the resolution. If a 106 * source address is not provided, a usable address will be returned via 107 * the callback. 108 * @dst_addr: The destination address to resolve. 109 * @addr: A reference to a data location that will receive the resolved 110 * addresses. The data location must remain valid until the callback has 111 * been invoked. The net field of the addr struct must be valid. 112 * @timeout_ms: Amount of time to wait for the address resolution to complete. 113 * @callback: Call invoked once address resolution has completed, timed out, 114 * or been canceled. A status of 0 indicates success. 115 * @context: User-specified context associated with the call. 116 */ 117 int rdma_resolve_ip(struct rdma_addr_client *client, 118 struct sockaddr *src_addr, struct sockaddr *dst_addr, 119 struct rdma_dev_addr *addr, int timeout_ms, 120 void (*callback)(int status, struct sockaddr *src_addr, 121 struct rdma_dev_addr *addr, void *context), 122 void *context); 123 124 int rdma_resolve_ip_route(struct sockaddr *src_addr, 125 const struct sockaddr *dst_addr, 126 struct rdma_dev_addr *addr); 127 128 void rdma_addr_cancel(struct rdma_dev_addr *addr); 129 130 int rdma_copy_addr(struct rdma_dev_addr *dev_addr, struct net_device *dev, 131 const unsigned char *dst_dev_addr); 132 133 int rdma_addr_size(struct sockaddr *addr); 134 135 int rdma_addr_find_smac_by_sgid(union ib_gid *sgid, u8 *smac, u16 *vlan_id); 136 int rdma_addr_find_l2_eth_by_grh(const union ib_gid *sgid, 137 const union ib_gid *dgid, 138 u8 *smac, u16 *vlan_id, int *if_index, 139 int *hoplimit); 140 141 static inline u16 ib_addr_get_pkey(struct rdma_dev_addr *dev_addr) 142 { 143 return ((u16)dev_addr->broadcast[8] << 8) | (u16)dev_addr->broadcast[9]; 144 } 145 146 static inline void ib_addr_set_pkey(struct rdma_dev_addr *dev_addr, u16 pkey) 147 { 148 dev_addr->broadcast[8] = pkey >> 8; 149 dev_addr->broadcast[9] = (unsigned char) pkey; 150 } 151 152 static inline void ib_addr_get_mgid(struct rdma_dev_addr *dev_addr, 153 union ib_gid *gid) 154 { 155 memcpy(gid, dev_addr->broadcast + 4, sizeof *gid); 156 } 157 158 static inline int rdma_addr_gid_offset(struct rdma_dev_addr *dev_addr) 159 { 160 return dev_addr->dev_type == ARPHRD_INFINIBAND ? 4 : 0; 161 } 162 163 static inline u16 rdma_vlan_dev_vlan_id(const struct net_device *dev) 164 { 165 uint16_t tag; 166 167 if (VLAN_TAG(__DECONST(struct ifnet *, dev), &tag) != 0) 168 return 0xffff; 169 return tag; 170 } 171 172 static inline int rdma_ip2gid(const struct sockaddr *addr, union ib_gid *gid) 173 { 174 switch (addr->sa_family) { 175 case AF_INET: 176 ipv6_addr_set_v4mapped(((const struct sockaddr_in *) 177 addr)->sin_addr.s_addr, 178 (struct in6_addr *)gid); 179 break; 180 case AF_INET6: 181 memcpy(gid->raw, &((const struct sockaddr_in6 *)addr)->sin6_addr, 16); 182 /* make sure scope ID gets zeroed inside GID */ 183 if (IN6_IS_SCOPE_LINKLOCAL((struct in6_addr *)gid->raw) || 184 IN6_IS_ADDR_MC_INTFACELOCAL((struct in6_addr *)gid->raw)) { 185 gid->raw[2] = 0; 186 gid->raw[3] = 0; 187 } 188 break; 189 default: 190 return -EINVAL; 191 } 192 return 0; 193 } 194 195 /* Important - sockaddr should be a union of sockaddr_in and sockaddr_in6 */ 196 static inline void rdma_gid2ip(struct sockaddr *out, const union ib_gid *gid) 197 { 198 if (ipv6_addr_v4mapped((const struct in6_addr *)gid)) { 199 struct sockaddr_in *out_in = (struct sockaddr_in *)out; 200 memset(out_in, 0, sizeof(*out_in)); 201 out_in->sin_len = sizeof(*out_in); 202 out_in->sin_family = AF_INET; 203 memcpy(&out_in->sin_addr.s_addr, gid->raw + 12, 4); 204 } else { 205 struct sockaddr_in6 *out_in = (struct sockaddr_in6 *)out; 206 memset(out_in, 0, sizeof(*out_in)); 207 out_in->sin6_len = sizeof(*out_in); 208 out_in->sin6_family = AF_INET6; 209 memcpy(&out_in->sin6_addr.s6_addr, gid->raw, 16); 210 } 211 } 212 213 static inline void iboe_addr_get_sgid(struct rdma_dev_addr *dev_addr, 214 union ib_gid *gid) 215 { 216 struct net_device *dev; 217 struct ifaddr *ifa; 218 219 dev = dev_get_by_index(&init_net, dev_addr->bound_dev_if); 220 if (dev) { 221 TAILQ_FOREACH(ifa, &dev->if_addrhead, ifa_link) { 222 if (ifa->ifa_addr == NULL || 223 ifa->ifa_addr->sa_family != AF_INET) 224 continue; 225 ipv6_addr_set_v4mapped(((struct sockaddr_in *) 226 ifa->ifa_addr)->sin_addr.s_addr, 227 (struct in6_addr *)gid); 228 break; 229 } 230 dev_put(dev); 231 } 232 } 233 234 static inline void rdma_addr_get_sgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid) 235 { 236 if (dev_addr->transport == RDMA_TRANSPORT_IB && 237 dev_addr->dev_type != ARPHRD_INFINIBAND) 238 iboe_addr_get_sgid(dev_addr, gid); 239 else 240 memcpy(gid, dev_addr->src_dev_addr + 241 rdma_addr_gid_offset(dev_addr), sizeof *gid); 242 } 243 244 static inline void rdma_addr_set_sgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid) 245 { 246 memcpy(dev_addr->src_dev_addr + rdma_addr_gid_offset(dev_addr), gid, sizeof *gid); 247 } 248 249 static inline void rdma_addr_get_dgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid) 250 { 251 memcpy(gid, dev_addr->dst_dev_addr + rdma_addr_gid_offset(dev_addr), sizeof *gid); 252 } 253 254 static inline void rdma_addr_set_dgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid) 255 { 256 memcpy(dev_addr->dst_dev_addr + rdma_addr_gid_offset(dev_addr), gid, sizeof *gid); 257 } 258 259 static inline enum ib_mtu iboe_get_mtu(int mtu) 260 { 261 /* 262 * reduce IB headers from effective IBoE MTU. 28 stands for 263 * atomic header which is the biggest possible header after BTH 264 */ 265 mtu = mtu - IB_GRH_BYTES - IB_BTH_BYTES - 28; 266 267 if (mtu >= ib_mtu_enum_to_int(IB_MTU_4096)) 268 return IB_MTU_4096; 269 else if (mtu >= ib_mtu_enum_to_int(IB_MTU_2048)) 270 return IB_MTU_2048; 271 else if (mtu >= ib_mtu_enum_to_int(IB_MTU_1024)) 272 return IB_MTU_1024; 273 else if (mtu >= ib_mtu_enum_to_int(IB_MTU_512)) 274 return IB_MTU_512; 275 else if (mtu >= ib_mtu_enum_to_int(IB_MTU_256)) 276 return IB_MTU_256; 277 else 278 return 0; 279 } 280 281 static inline int iboe_get_rate(struct net_device *dev) 282 { 283 uint64_t baudrate = dev->if_baudrate; 284 #ifdef if_baudrate_pf 285 int exp; 286 for (exp = dev->if_baudrate_pf; exp > 0; exp--) 287 baudrate *= 10; 288 #endif 289 if (baudrate >= IF_Gbps(40)) 290 return IB_RATE_40_GBPS; 291 else if (baudrate >= IF_Gbps(30)) 292 return IB_RATE_30_GBPS; 293 else if (baudrate >= IF_Gbps(20)) 294 return IB_RATE_20_GBPS; 295 else if (baudrate >= IF_Gbps(10)) 296 return IB_RATE_10_GBPS; 297 else 298 return IB_RATE_PORT_CURRENT; 299 } 300 301 static inline int rdma_link_local_addr(struct in6_addr *addr) 302 { 303 if (addr->s6_addr32[0] == htonl(0xfe800000) && 304 addr->s6_addr32[1] == 0) 305 return 1; 306 307 return 0; 308 } 309 310 static inline void rdma_get_ll_mac(struct in6_addr *addr, u8 *mac) 311 { 312 memcpy(mac, &addr->s6_addr[8], 3); 313 memcpy(mac + 3, &addr->s6_addr[13], 3); 314 mac[0] ^= 2; 315 } 316 317 static inline int rdma_is_multicast_addr(struct in6_addr *addr) 318 { 319 return addr->s6_addr[0] == 0xff; 320 } 321 322 static inline void rdma_get_mcast_mac(struct in6_addr *addr, u8 *mac) 323 { 324 int i; 325 326 mac[0] = 0x33; 327 mac[1] = 0x33; 328 for (i = 2; i < 6; ++i) 329 mac[i] = addr->s6_addr[i + 10]; 330 } 331 332 static inline u16 rdma_get_vlan_id(union ib_gid *dgid) 333 { 334 u16 vid; 335 336 vid = dgid->raw[11] << 8 | dgid->raw[12]; 337 return vid < 0x1000 ? vid : 0xffff; 338 } 339 340 static inline struct net_device *rdma_vlan_dev_real_dev(const struct net_device *dev) 341 { 342 return VLAN_TRUNKDEV(__DECONST(struct ifnet *, dev)); 343 } 344 345 #endif /* IB_ADDR_H */ 346