1 /* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */ 2 /* 3 * Copyright (c) 2005 Voltaire Inc. All rights reserved. 4 * Copyright (c) 2005 Intel Corporation. All rights reserved. 5 */ 6 7 #ifndef IB_ADDR_H 8 #define IB_ADDR_H 9 10 #include <linux/in.h> 11 #include <linux/in6.h> 12 #include <linux/if_arp.h> 13 #include <linux/netdevice.h> 14 #include <linux/inetdevice.h> 15 #include <linux/socket.h> 16 #include <linux/if_vlan.h> 17 #include <net/ipv6.h> 18 #include <net/if_inet6.h> 19 #include <net/ip.h> 20 #include <rdma/ib_verbs.h> 21 #include <rdma/ib_pack.h> 22 #include <net/net_namespace.h> 23 24 /** 25 * struct rdma_dev_addr - Contains resolved RDMA hardware addresses 26 * @src_dev_addr: Source MAC address. 27 * @dst_dev_addr: Destination MAC address. 28 * @broadcast: Broadcast address of the device. 29 * @dev_type: The interface hardware type of the device. 30 * @bound_dev_if: An optional device interface index. 31 * @transport: The transport type used. 32 * @net: Network namespace containing the bound_dev_if net_dev. 33 * @sgid_attr: GID attribute to use for identified SGID 34 */ 35 struct rdma_dev_addr { 36 unsigned char src_dev_addr[MAX_ADDR_LEN]; 37 unsigned char dst_dev_addr[MAX_ADDR_LEN]; 38 unsigned char broadcast[MAX_ADDR_LEN]; 39 unsigned short dev_type; 40 int bound_dev_if; 41 enum rdma_transport_type transport; 42 struct net *net; 43 const struct ib_gid_attr *sgid_attr; 44 enum rdma_network_type network; 45 int hoplimit; 46 }; 47 48 /** 49 * rdma_translate_ip - Translate a local IP address to an RDMA hardware 50 * address. 51 * 52 * The dev_addr->net field must be initialized. 53 */ 54 int rdma_translate_ip(const struct sockaddr *addr, 55 struct rdma_dev_addr *dev_addr); 56 57 /** 58 * rdma_resolve_ip - Resolve source and destination IP addresses to 59 * RDMA hardware addresses. 60 * @src_addr: An optional source address to use in the resolution. If a 61 * source address is not provided, a usable address will be returned via 62 * the callback. 63 * @dst_addr: The destination address to resolve. 64 * @addr: A reference to a data location that will receive the resolved 65 * addresses. The data location must remain valid until the callback has 66 * been invoked. The net field of the addr struct must be valid. 67 * @timeout_ms: Amount of time to wait for the address resolution to complete. 68 * @callback: Call invoked once address resolution has completed, timed out, 69 * or been canceled. A status of 0 indicates success. 70 * @resolve_by_gid_attr: Resolve the ip based on the GID attribute from 71 * rdma_dev_addr. 72 * @context: User-specified context associated with the call. 73 */ 74 int rdma_resolve_ip(struct sockaddr *src_addr, const struct sockaddr *dst_addr, 75 struct rdma_dev_addr *addr, unsigned long timeout_ms, 76 void (*callback)(int status, struct sockaddr *src_addr, 77 struct rdma_dev_addr *addr, void *context), 78 bool resolve_by_gid_attr, void *context); 79 80 void rdma_addr_cancel(struct rdma_dev_addr *addr); 81 82 int rdma_addr_size(const struct sockaddr *addr); 83 int rdma_addr_size_in6(struct sockaddr_in6 *addr); 84 int rdma_addr_size_kss(struct __kernel_sockaddr_storage *addr); 85 86 static inline u16 ib_addr_get_pkey(struct rdma_dev_addr *dev_addr) 87 { 88 return ((u16)dev_addr->broadcast[8] << 8) | (u16)dev_addr->broadcast[9]; 89 } 90 91 static inline void ib_addr_set_pkey(struct rdma_dev_addr *dev_addr, u16 pkey) 92 { 93 dev_addr->broadcast[8] = pkey >> 8; 94 dev_addr->broadcast[9] = (unsigned char) pkey; 95 } 96 97 static inline void ib_addr_get_mgid(struct rdma_dev_addr *dev_addr, 98 union ib_gid *gid) 99 { 100 memcpy(gid, dev_addr->broadcast + 4, sizeof *gid); 101 } 102 103 static inline int rdma_addr_gid_offset(struct rdma_dev_addr *dev_addr) 104 { 105 return dev_addr->dev_type == ARPHRD_INFINIBAND ? 4 : 0; 106 } 107 108 static inline u16 rdma_vlan_dev_vlan_id(const struct net_device *dev) 109 { 110 return is_vlan_dev(dev) ? vlan_dev_vlan_id(dev) : 0xffff; 111 } 112 113 static inline int rdma_ip2gid(struct sockaddr *addr, union ib_gid *gid) 114 { 115 switch (addr->sa_family) { 116 case AF_INET: 117 ipv6_addr_set_v4mapped(((struct sockaddr_in *) 118 addr)->sin_addr.s_addr, 119 (struct in6_addr *)gid); 120 break; 121 case AF_INET6: 122 *(struct in6_addr *)&gid->raw = 123 ((struct sockaddr_in6 *)addr)->sin6_addr; 124 break; 125 default: 126 return -EINVAL; 127 } 128 return 0; 129 } 130 131 /* Important - sockaddr should be a union of sockaddr_in and sockaddr_in6 */ 132 static inline void rdma_gid2ip(struct sockaddr *out, const union ib_gid *gid) 133 { 134 if (ipv6_addr_v4mapped((struct in6_addr *)gid)) { 135 struct sockaddr_in *out_in = (struct sockaddr_in *)out; 136 memset(out_in, 0, sizeof(*out_in)); 137 out_in->sin_family = AF_INET; 138 memcpy(&out_in->sin_addr.s_addr, gid->raw + 12, 4); 139 } else { 140 struct sockaddr_in6 *out_in = (struct sockaddr_in6 *)out; 141 memset(out_in, 0, sizeof(*out_in)); 142 out_in->sin6_family = AF_INET6; 143 memcpy(&out_in->sin6_addr.s6_addr, gid->raw, 16); 144 } 145 } 146 147 /* 148 * rdma_get/set_sgid/dgid() APIs are applicable to IB, and iWarp. 149 * They are not applicable to RoCE. 150 * RoCE GIDs are derived from the IP addresses. 151 */ 152 static inline void rdma_addr_get_sgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid) 153 { 154 memcpy(gid, dev_addr->src_dev_addr + rdma_addr_gid_offset(dev_addr), 155 sizeof(*gid)); 156 } 157 158 static inline void rdma_addr_set_sgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid) 159 { 160 memcpy(dev_addr->src_dev_addr + rdma_addr_gid_offset(dev_addr), gid, sizeof *gid); 161 } 162 163 static inline void rdma_addr_get_dgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid) 164 { 165 memcpy(gid, dev_addr->dst_dev_addr + rdma_addr_gid_offset(dev_addr), sizeof *gid); 166 } 167 168 static inline void rdma_addr_set_dgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid) 169 { 170 memcpy(dev_addr->dst_dev_addr + rdma_addr_gid_offset(dev_addr), gid, sizeof *gid); 171 } 172 173 static inline enum ib_mtu iboe_get_mtu(int mtu) 174 { 175 /* 176 * Reduce IB headers from effective IBoE MTU. 177 */ 178 mtu = mtu - (IB_GRH_BYTES + IB_UDP_BYTES + IB_BTH_BYTES + 179 IB_EXT_XRC_BYTES + IB_EXT_ATOMICETH_BYTES + 180 IB_ICRC_BYTES); 181 182 if (mtu >= ib_mtu_enum_to_int(IB_MTU_4096)) 183 return IB_MTU_4096; 184 else if (mtu >= ib_mtu_enum_to_int(IB_MTU_2048)) 185 return IB_MTU_2048; 186 else if (mtu >= ib_mtu_enum_to_int(IB_MTU_1024)) 187 return IB_MTU_1024; 188 else if (mtu >= ib_mtu_enum_to_int(IB_MTU_512)) 189 return IB_MTU_512; 190 else if (mtu >= ib_mtu_enum_to_int(IB_MTU_256)) 191 return IB_MTU_256; 192 else 193 return 0; 194 } 195 196 static inline int iboe_get_rate(struct net_device *dev) 197 { 198 struct ethtool_link_ksettings cmd; 199 int err; 200 201 rtnl_lock(); 202 err = __ethtool_get_link_ksettings(dev, &cmd); 203 rtnl_unlock(); 204 if (err) 205 return IB_RATE_PORT_CURRENT; 206 207 if (cmd.base.speed >= 40000) 208 return IB_RATE_40_GBPS; 209 else if (cmd.base.speed >= 30000) 210 return IB_RATE_30_GBPS; 211 else if (cmd.base.speed >= 20000) 212 return IB_RATE_20_GBPS; 213 else if (cmd.base.speed >= 10000) 214 return IB_RATE_10_GBPS; 215 else 216 return IB_RATE_PORT_CURRENT; 217 } 218 219 static inline int rdma_link_local_addr(struct in6_addr *addr) 220 { 221 if (addr->s6_addr32[0] == htonl(0xfe800000) && 222 addr->s6_addr32[1] == 0) 223 return 1; 224 225 return 0; 226 } 227 228 static inline void rdma_get_ll_mac(struct in6_addr *addr, u8 *mac) 229 { 230 memcpy(mac, &addr->s6_addr[8], 3); 231 memcpy(mac + 3, &addr->s6_addr[13], 3); 232 mac[0] ^= 2; 233 } 234 235 static inline int rdma_is_multicast_addr(struct in6_addr *addr) 236 { 237 __be32 ipv4_addr; 238 239 if (addr->s6_addr[0] == 0xff) 240 return 1; 241 242 ipv4_addr = addr->s6_addr32[3]; 243 return (ipv6_addr_v4mapped(addr) && ipv4_is_multicast(ipv4_addr)); 244 } 245 246 static inline void rdma_get_mcast_mac(struct in6_addr *addr, u8 *mac) 247 { 248 int i; 249 250 mac[0] = 0x33; 251 mac[1] = 0x33; 252 for (i = 2; i < 6; ++i) 253 mac[i] = addr->s6_addr[i + 10]; 254 } 255 256 static inline u16 rdma_get_vlan_id(union ib_gid *dgid) 257 { 258 u16 vid; 259 260 vid = dgid->raw[11] << 8 | dgid->raw[12]; 261 return vid < 0x1000 ? vid : 0xffff; 262 } 263 264 static inline struct net_device *rdma_vlan_dev_real_dev(const struct net_device *dev) 265 { 266 return is_vlan_dev(dev) ? vlan_dev_real_dev(dev) : NULL; 267 } 268 269 #endif /* IB_ADDR_H */ 270