include/rdma/ib_addr.h

   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 */