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