include/rdma/ib_addr.h

   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 struct rdma_addr_client {
  53         atomic_t refcount;
  54         struct completion comp;
  55 };
  56
  57 /**
  58  * rdma_addr_register_client - Register an address client.
  59  */
  60 void rdma_addr_register_client(struct rdma_addr_client *client);
  61
  62 /**
  63  * rdma_addr_unregister_client - Deregister an address client.
  64  * @client: Client object to deregister.
  65  */
  66 void rdma_addr_unregister_client(struct rdma_addr_client *client);
  67
  68 /**
  69  * struct rdma_dev_addr - Contains resolved RDMA hardware addresses
  70  * @src_dev_addr:       Source MAC address.
  71  * @dst_dev_addr:       Destination MAC address.
  72  * @broadcast:          Broadcast address of the device.
  73  * @dev_type:           The interface hardware type of the device.
  74  * @bound_dev_if:       An optional device interface index.
  75  * @transport:          The transport type used.
  76  * @net:                Network namespace containing the bound_dev_if net_dev.
  77  */
  78 struct rdma_dev_addr {
  79         unsigned char src_dev_addr[MAX_ADDR_LEN];
  80         unsigned char dst_dev_addr[MAX_ADDR_LEN];
  81         unsigned char broadcast[MAX_ADDR_LEN];
  82         unsigned short dev_type;
  83         int bound_dev_if;
  84         enum rdma_transport_type transport;
  85         struct net *net;
  86         enum rdma_network_type network;
  87         int hoplimit;
  88 };
  89
  90 /**
  91  * rdma_translate_ip - Translate a local IP address to an RDMA hardware
  92  *   address.
  93  *
  94  * The dev_addr->net field must be initialized.
  95  */
  96 int rdma_translate_ip(const struct sockaddr *addr,
  97                       struct rdma_dev_addr *dev_addr);
  98
  99 /**
 100  * rdma_resolve_ip - Resolve source and destination IP addresses to
 101  *   RDMA hardware addresses.
 102  * @client: Address client associated with request.
 103  * @src_addr: An optional source address to use in the resolution.  If a
 104  *   source address is not provided, a usable address will be returned via
 105  *   the callback.
 106  * @dst_addr: The destination address to resolve.
 107  * @addr: A reference to a data location that will receive the resolved
 108  *   addresses.  The data location must remain valid until the callback has
 109  *   been invoked. The net field of the addr struct must be valid.
 110  * @timeout_ms: Amount of time to wait for the address resolution to complete.
 111  * @callback: Call invoked once address resolution has completed, timed out,
 112  *   or been canceled.  A status of 0 indicates success.
 113  * @context: User-specified context associated with the call.
 114  */
 115 int rdma_resolve_ip(struct rdma_addr_client *client,
 116                     struct sockaddr *src_addr, struct sockaddr *dst_addr,
 117                     struct rdma_dev_addr *addr, int timeout_ms,
 118                     void (*callback)(int status, struct sockaddr *src_addr,
 119                                      struct rdma_dev_addr *addr, void *context),
 120                     void *context);
 121
 122 int rdma_resolve_ip_route(struct sockaddr *src_addr,
 123                           const struct sockaddr *dst_addr,
 124                           struct rdma_dev_addr *addr);
 125
 126 void rdma_addr_cancel(struct rdma_dev_addr *addr);
 127
 128 void rdma_copy_addr(struct rdma_dev_addr *dev_addr,
 129                     const struct net_device *dev,
 130                     const unsigned char *dst_dev_addr);
 131
 132 int rdma_addr_size(struct sockaddr *addr);
 133 int rdma_addr_size_in6(struct sockaddr_in6 *addr);
 134 int rdma_addr_size_kss(struct __kernel_sockaddr_storage *addr);
 135
 136 int rdma_addr_find_l2_eth_by_grh(const union ib_gid *sgid,
 137                                  const union ib_gid *dgid,
 138                                  u8 *dmac, const struct net_device *ndev,
 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         return is_vlan_dev(dev) ? vlan_dev_vlan_id(dev) : 0xffff;
 166 }
 167
 168 static inline int rdma_ip2gid(struct sockaddr *addr, union ib_gid *gid)
 169 {
 170         switch (addr->sa_family) {
 171         case AF_INET:
 172                 ipv6_addr_set_v4mapped(((struct sockaddr_in *)
 173                                         addr)->sin_addr.s_addr,
 174                                        (struct in6_addr *)gid);
 175                 break;
 176         case AF_INET6:
 177                 *(struct in6_addr *)&gid->raw =
 178                         ((struct sockaddr_in6 *)addr)->sin6_addr;
 179                 break;
 180         default:
 181                 return -EINVAL;
 182         }
 183         return 0;
 184 }
 185
 186 /* Important - sockaddr should be a union of sockaddr_in and sockaddr_in6 */
 187 static inline void rdma_gid2ip(struct sockaddr *out, const union ib_gid *gid)
 188 {
 189         if (ipv6_addr_v4mapped((struct in6_addr *)gid)) {
 190                 struct sockaddr_in *out_in = (struct sockaddr_in *)out;
 191                 memset(out_in, 0, sizeof(*out_in));
 192                 out_in->sin_family = AF_INET;
 193                 memcpy(&out_in->sin_addr.s_addr, gid->raw + 12, 4);
 194         } else {
 195                 struct sockaddr_in6 *out_in = (struct sockaddr_in6 *)out;
 196                 memset(out_in, 0, sizeof(*out_in));
 197                 out_in->sin6_family = AF_INET6;
 198                 memcpy(&out_in->sin6_addr.s6_addr, gid->raw, 16);
 199         }
 200 }
 201
 202 /*
 203  * rdma_get/set_sgid/dgid() APIs are applicable to IB, and iWarp.
 204  * They are not applicable to RoCE.
 205  * RoCE GIDs are derived from the IP addresses.
 206  */
 207 static inline void rdma_addr_get_sgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid)
 208 {
 209         memcpy(gid, dev_addr->src_dev_addr + rdma_addr_gid_offset(dev_addr),
 210                sizeof(*gid));
 211 }
 212
 213 static inline void rdma_addr_set_sgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid)
 214 {
 215         memcpy(dev_addr->src_dev_addr + rdma_addr_gid_offset(dev_addr), gid, sizeof *gid);
 216 }
 217
 218 static inline void rdma_addr_get_dgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid)
 219 {
 220         memcpy(gid, dev_addr->dst_dev_addr + rdma_addr_gid_offset(dev_addr), sizeof *gid);
 221 }
 222
 223 static inline void rdma_addr_set_dgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid)
 224 {
 225         memcpy(dev_addr->dst_dev_addr + rdma_addr_gid_offset(dev_addr), gid, sizeof *gid);
 226 }
 227
 228 static inline enum ib_mtu iboe_get_mtu(int mtu)
 229 {
 230         /*
 231          * Reduce IB headers from effective IBoE MTU.
 232          */
 233         mtu = mtu - (IB_GRH_BYTES + IB_UDP_BYTES + IB_BTH_BYTES +
 234                      IB_EXT_XRC_BYTES + IB_EXT_ATOMICETH_BYTES +
 235                      IB_ICRC_BYTES);
 236
 237         if (mtu >= ib_mtu_enum_to_int(IB_MTU_4096))
 238                 return IB_MTU_4096;
 239         else if (mtu >= ib_mtu_enum_to_int(IB_MTU_2048))
 240                 return IB_MTU_2048;
 241         else if (mtu >= ib_mtu_enum_to_int(IB_MTU_1024))
 242                 return IB_MTU_1024;
 243         else if (mtu >= ib_mtu_enum_to_int(IB_MTU_512))
 244                 return IB_MTU_512;
 245         else if (mtu >= ib_mtu_enum_to_int(IB_MTU_256))
 246                 return IB_MTU_256;
 247         else
 248                 return 0;
 249 }
 250
 251 static inline int iboe_get_rate(struct net_device *dev)
 252 {
 253         struct ethtool_link_ksettings cmd;
 254         int err;
 255
 256         rtnl_lock();
 257         err = __ethtool_get_link_ksettings(dev, &cmd);
 258         rtnl_unlock();
 259         if (err)
 260                 return IB_RATE_PORT_CURRENT;
 261
 262         if (cmd.base.speed >= 40000)
 263                 return IB_RATE_40_GBPS;
 264         else if (cmd.base.speed >= 30000)
 265                 return IB_RATE_30_GBPS;
 266         else if (cmd.base.speed >= 20000)
 267                 return IB_RATE_20_GBPS;
 268         else if (cmd.base.speed >= 10000)
 269                 return IB_RATE_10_GBPS;
 270         else
 271                 return IB_RATE_PORT_CURRENT;
 272 }
 273
 274 static inline int rdma_link_local_addr(struct in6_addr *addr)
 275 {
 276         if (addr->s6_addr32[0] == htonl(0xfe800000) &&
 277             addr->s6_addr32[1] == 0)
 278                 return 1;
 279
 280         return 0;
 281 }
 282
 283 static inline void rdma_get_ll_mac(struct in6_addr *addr, u8 *mac)
 284 {
 285         memcpy(mac, &addr->s6_addr[8], 3);
 286         memcpy(mac + 3, &addr->s6_addr[13], 3);
 287         mac[0] ^= 2;
 288 }
 289
 290 static inline int rdma_is_multicast_addr(struct in6_addr *addr)
 291 {
 292         __be32 ipv4_addr;
 293
 294         if (addr->s6_addr[0] == 0xff)
 295                 return 1;
 296
 297         ipv4_addr = addr->s6_addr32[3];
 298         return (ipv6_addr_v4mapped(addr) && ipv4_is_multicast(ipv4_addr));
 299 }
 300
 301 static inline void rdma_get_mcast_mac(struct in6_addr *addr, u8 *mac)
 302 {
 303         int i;
 304
 305         mac[0] = 0x33;
 306         mac[1] = 0x33;
 307         for (i = 2; i < 6; ++i)
 308                 mac[i] = addr->s6_addr[i + 10];
 309 }
 310
 311 static inline u16 rdma_get_vlan_id(union ib_gid *dgid)
 312 {
 313         u16 vid;
 314
 315         vid = dgid->raw[11] << 8 | dgid->raw[12];
 316         return vid < 0x1000 ? vid : 0xffff;
 317 }
 318
 319 static inline struct net_device *rdma_vlan_dev_real_dev(const struct net_device *dev)
 320 {
 321         return is_vlan_dev(dev) ? vlan_dev_real_dev(dev) : NULL;
 322 }
 323
 324 #endif /* IB_ADDR_H */