1 /* 2 * Copyright (c) 2005 Voltaire Inc. All rights reserved. 3 * Copyright (c) 2005 Intel Corporation. All rights reserved. 4 * 5 * This software is available to you under a choice of one of two 6 * licenses. You may choose to be licensed under the terms of the GNU 7 * General Public License (GPL) Version 2, available from the file 8 * COPYING in the main directory of this source tree, or the 9 * OpenIB.org BSD license below: 10 * 11 * Redistribution and use in source and binary forms, with or 12 * without modification, are permitted provided that the following 13 * conditions are met: 14 * 15 * - Redistributions of source code must retain the above 16 * copyright notice, this list of conditions and the following 17 * disclaimer. 18 * 19 * - Redistributions in binary form must reproduce the above 20 * copyright notice, this list of conditions and the following 21 * disclaimer in the documentation and/or other materials 22 * provided with the distribution. 23 * 24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 31 * SOFTWARE. 32 */ 33 34 #if !defined(IB_ADDR_H) 35 #define IB_ADDR_H 36 37 #include <linux/in.h> 38 #include <linux/in6.h> 39 #include <linux/if_arp.h> 40 #include <linux/netdevice.h> 41 #include <linux/inetdevice.h> 42 #include <linux/socket.h> 43 #include <linux/if_vlan.h> 44 #include <net/ipv6.h> 45 #include <net/if_inet6.h> 46 #include <net/ip.h> 47 #include <rdma/ib_verbs.h> 48 #include <rdma/ib_pack.h> 49 #include <net/ipv6.h> 50 #include <net/net_namespace.h> 51 52 /** 53 * struct rdma_dev_addr - Contains resolved RDMA hardware addresses 54 * @src_dev_addr: Source MAC address. 55 * @dst_dev_addr: Destination MAC address. 56 * @broadcast: Broadcast address of the device. 57 * @dev_type: The interface hardware type of the device. 58 * @bound_dev_if: An optional device interface index. 59 * @transport: The transport type used. 60 * @net: Network namespace containing the bound_dev_if net_dev. 61 * @sgid_attr: GID attribute to use for identified SGID 62 */ 63 struct rdma_dev_addr { 64 unsigned char src_dev_addr[MAX_ADDR_LEN]; 65 unsigned char dst_dev_addr[MAX_ADDR_LEN]; 66 unsigned char broadcast[MAX_ADDR_LEN]; 67 unsigned short dev_type; 68 int bound_dev_if; 69 enum rdma_transport_type transport; 70 struct net *net; 71 const struct ib_gid_attr *sgid_attr; 72 enum rdma_network_type network; 73 int hoplimit; 74 }; 75 76 /** 77 * rdma_translate_ip - Translate a local IP address to an RDMA hardware 78 * address. 79 * 80 * The dev_addr->net field must be initialized. 81 */ 82 int rdma_translate_ip(const struct sockaddr *addr, 83 struct rdma_dev_addr *dev_addr); 84 85 /** 86 * rdma_resolve_ip - Resolve source and destination IP addresses to 87 * RDMA hardware addresses. 88 * @src_addr: An optional source address to use in the resolution. If a 89 * source address is not provided, a usable address will be returned via 90 * the callback. 91 * @dst_addr: The destination address to resolve. 92 * @addr: A reference to a data location that will receive the resolved 93 * addresses. The data location must remain valid until the callback has 94 * been invoked. The net field of the addr struct must be valid. 95 * @timeout_ms: Amount of time to wait for the address resolution to complete. 96 * @callback: Call invoked once address resolution has completed, timed out, 97 * or been canceled. A status of 0 indicates success. 98 * @resolve_by_gid_attr: Resolve the ip based on the GID attribute from 99 * rdma_dev_addr. 100 * @context: User-specified context associated with the call. 101 */ 102 int rdma_resolve_ip(struct sockaddr *src_addr, const struct sockaddr *dst_addr, 103 struct rdma_dev_addr *addr, int timeout_ms, 104 void (*callback)(int status, struct sockaddr *src_addr, 105 struct rdma_dev_addr *addr, void *context), 106 bool resolve_by_gid_attr, 107 void *context); 108 109 void rdma_addr_cancel(struct rdma_dev_addr *addr); 110 111 int rdma_addr_size(const struct sockaddr *addr); 112 int rdma_addr_size_in6(struct sockaddr_in6 *addr); 113 int rdma_addr_size_kss(struct __kernel_sockaddr_storage *addr); 114 115 static inline u16 ib_addr_get_pkey(struct rdma_dev_addr *dev_addr) 116 { 117 return ((u16)dev_addr->broadcast[8] << 8) | (u16)dev_addr->broadcast[9]; 118 } 119 120 static inline void ib_addr_set_pkey(struct rdma_dev_addr *dev_addr, u16 pkey) 121 { 122 dev_addr->broadcast[8] = pkey >> 8; 123 dev_addr->broadcast[9] = (unsigned char) pkey; 124 } 125 126 static inline void ib_addr_get_mgid(struct rdma_dev_addr *dev_addr, 127 union ib_gid *gid) 128 { 129 memcpy(gid, dev_addr->broadcast + 4, sizeof *gid); 130 } 131 132 static inline int rdma_addr_gid_offset(struct rdma_dev_addr *dev_addr) 133 { 134 return dev_addr->dev_type == ARPHRD_INFINIBAND ? 4 : 0; 135 } 136 137 static inline u16 rdma_vlan_dev_vlan_id(const struct net_device *dev) 138 { 139 return is_vlan_dev(dev) ? vlan_dev_vlan_id(dev) : 0xffff; 140 } 141 142 static inline int rdma_ip2gid(struct sockaddr *addr, union ib_gid *gid) 143 { 144 switch (addr->sa_family) { 145 case AF_INET: 146 ipv6_addr_set_v4mapped(((struct sockaddr_in *) 147 addr)->sin_addr.s_addr, 148 (struct in6_addr *)gid); 149 break; 150 case AF_INET6: 151 *(struct in6_addr *)&gid->raw = 152 ((struct sockaddr_in6 *)addr)->sin6_addr; 153 break; 154 default: 155 return -EINVAL; 156 } 157 return 0; 158 } 159 160 /* Important - sockaddr should be a union of sockaddr_in and sockaddr_in6 */ 161 static inline void rdma_gid2ip(struct sockaddr *out, const union ib_gid *gid) 162 { 163 if (ipv6_addr_v4mapped((struct in6_addr *)gid)) { 164 struct sockaddr_in *out_in = (struct sockaddr_in *)out; 165 memset(out_in, 0, sizeof(*out_in)); 166 out_in->sin_family = AF_INET; 167 memcpy(&out_in->sin_addr.s_addr, gid->raw + 12, 4); 168 } else { 169 struct sockaddr_in6 *out_in = (struct sockaddr_in6 *)out; 170 memset(out_in, 0, sizeof(*out_in)); 171 out_in->sin6_family = AF_INET6; 172 memcpy(&out_in->sin6_addr.s6_addr, gid->raw, 16); 173 } 174 } 175 176 /* 177 * rdma_get/set_sgid/dgid() APIs are applicable to IB, and iWarp. 178 * They are not applicable to RoCE. 179 * RoCE GIDs are derived from the IP addresses. 180 */ 181 static inline void rdma_addr_get_sgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid) 182 { 183 memcpy(gid, dev_addr->src_dev_addr + rdma_addr_gid_offset(dev_addr), 184 sizeof(*gid)); 185 } 186 187 static inline void rdma_addr_set_sgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid) 188 { 189 memcpy(dev_addr->src_dev_addr + rdma_addr_gid_offset(dev_addr), gid, sizeof *gid); 190 } 191 192 static inline void rdma_addr_get_dgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid) 193 { 194 memcpy(gid, dev_addr->dst_dev_addr + rdma_addr_gid_offset(dev_addr), sizeof *gid); 195 } 196 197 static inline void rdma_addr_set_dgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid) 198 { 199 memcpy(dev_addr->dst_dev_addr + rdma_addr_gid_offset(dev_addr), gid, sizeof *gid); 200 } 201 202 static inline enum ib_mtu iboe_get_mtu(int mtu) 203 { 204 /* 205 * Reduce IB headers from effective IBoE MTU. 206 */ 207 mtu = mtu - (IB_GRH_BYTES + IB_UDP_BYTES + IB_BTH_BYTES + 208 IB_EXT_XRC_BYTES + IB_EXT_ATOMICETH_BYTES + 209 IB_ICRC_BYTES); 210 211 if (mtu >= ib_mtu_enum_to_int(IB_MTU_4096)) 212 return IB_MTU_4096; 213 else if (mtu >= ib_mtu_enum_to_int(IB_MTU_2048)) 214 return IB_MTU_2048; 215 else if (mtu >= ib_mtu_enum_to_int(IB_MTU_1024)) 216 return IB_MTU_1024; 217 else if (mtu >= ib_mtu_enum_to_int(IB_MTU_512)) 218 return IB_MTU_512; 219 else if (mtu >= ib_mtu_enum_to_int(IB_MTU_256)) 220 return IB_MTU_256; 221 else 222 return 0; 223 } 224 225 static inline int iboe_get_rate(struct net_device *dev) 226 { 227 struct ethtool_link_ksettings cmd; 228 int err; 229 230 rtnl_lock(); 231 err = __ethtool_get_link_ksettings(dev, &cmd); 232 rtnl_unlock(); 233 if (err) 234 return IB_RATE_PORT_CURRENT; 235 236 if (cmd.base.speed >= 40000) 237 return IB_RATE_40_GBPS; 238 else if (cmd.base.speed >= 30000) 239 return IB_RATE_30_GBPS; 240 else if (cmd.base.speed >= 20000) 241 return IB_RATE_20_GBPS; 242 else if (cmd.base.speed >= 10000) 243 return IB_RATE_10_GBPS; 244 else 245 return IB_RATE_PORT_CURRENT; 246 } 247 248 static inline int rdma_link_local_addr(struct in6_addr *addr) 249 { 250 if (addr->s6_addr32[0] == htonl(0xfe800000) && 251 addr->s6_addr32[1] == 0) 252 return 1; 253 254 return 0; 255 } 256 257 static inline void rdma_get_ll_mac(struct in6_addr *addr, u8 *mac) 258 { 259 memcpy(mac, &addr->s6_addr[8], 3); 260 memcpy(mac + 3, &addr->s6_addr[13], 3); 261 mac[0] ^= 2; 262 } 263 264 static inline int rdma_is_multicast_addr(struct in6_addr *addr) 265 { 266 __be32 ipv4_addr; 267 268 if (addr->s6_addr[0] == 0xff) 269 return 1; 270 271 ipv4_addr = addr->s6_addr32[3]; 272 return (ipv6_addr_v4mapped(addr) && ipv4_is_multicast(ipv4_addr)); 273 } 274 275 static inline void rdma_get_mcast_mac(struct in6_addr *addr, u8 *mac) 276 { 277 int i; 278 279 mac[0] = 0x33; 280 mac[1] = 0x33; 281 for (i = 2; i < 6; ++i) 282 mac[i] = addr->s6_addr[i + 10]; 283 } 284 285 static inline u16 rdma_get_vlan_id(union ib_gid *dgid) 286 { 287 u16 vid; 288 289 vid = dgid->raw[11] << 8 | dgid->raw[12]; 290 return vid < 0x1000 ? vid : 0xffff; 291 } 292 293 static inline struct net_device *rdma_vlan_dev_real_dev(const struct net_device *dev) 294 { 295 return is_vlan_dev(dev) ? vlan_dev_real_dev(dev) : NULL; 296 } 297 298 #endif /* IB_ADDR_H */ 299