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, u16 *vlan_id);
  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 int rdma_copy_addr(struct rdma_dev_addr *dev_addr, struct net_device *dev,
 129               const unsigned char *dst_dev_addr);
 130
 131 int rdma_addr_size(struct sockaddr *addr);
 132
 133 int rdma_addr_find_smac_by_sgid(union ib_gid *sgid, u8 *smac, u16 *vlan_id);
 134 int rdma_addr_find_l2_eth_by_grh(const union ib_gid *sgid,
 135                                  const union ib_gid *dgid,
 136                                  u8 *smac, u16 *vlan_id, int *if_index,
 137                                  int *hoplimit);
 138
 139 static inline u16 ib_addr_get_pkey(struct rdma_dev_addr *dev_addr)
 140 {
 141         return ((u16)dev_addr->broadcast[8] << 8) | (u16)dev_addr->broadcast[9];
 142 }
 143
 144 static inline void ib_addr_set_pkey(struct rdma_dev_addr *dev_addr, u16 pkey)
 145 {
 146         dev_addr->broadcast[8] = pkey >> 8;
 147         dev_addr->broadcast[9] = (unsigned char) pkey;
 148 }
 149
 150 static inline void ib_addr_get_mgid(struct rdma_dev_addr *dev_addr,
 151                                     union ib_gid *gid)
 152 {
 153         memcpy(gid, dev_addr->broadcast + 4, sizeof *gid);
 154 }
 155
 156 static inline int rdma_addr_gid_offset(struct rdma_dev_addr *dev_addr)
 157 {
 158         return dev_addr->dev_type == ARPHRD_INFINIBAND ? 4 : 0;
 159 }
 160
 161 static inline u16 rdma_vlan_dev_vlan_id(const struct net_device *dev)
 162 {
 163         return dev->priv_flags & IFF_802_1Q_VLAN ?
 164                 vlan_dev_vlan_id(dev) : 0xffff;
 165 }
 166
 167 static inline int rdma_ip2gid(struct sockaddr *addr, union ib_gid *gid)
 168 {
 169         switch (addr->sa_family) {
 170         case AF_INET:
 171                 ipv6_addr_set_v4mapped(((struct sockaddr_in *)
 172                                         addr)->sin_addr.s_addr,
 173                                        (struct in6_addr *)gid);
 174                 break;
 175         case AF_INET6:
 176                 memcpy(gid->raw, &((struct sockaddr_in6 *)addr)->sin6_addr, 16);
 177                 break;
 178         default:
 179                 return -EINVAL;
 180         }
 181         return 0;
 182 }
 183
 184 /* Important - sockaddr should be a union of sockaddr_in and sockaddr_in6 */
 185 static inline void rdma_gid2ip(struct sockaddr *out, const union ib_gid *gid)
 186 {
 187         if (ipv6_addr_v4mapped((struct in6_addr *)gid)) {
 188                 struct sockaddr_in *out_in = (struct sockaddr_in *)out;
 189                 memset(out_in, 0, sizeof(*out_in));
 190                 out_in->sin_family = AF_INET;
 191                 memcpy(&out_in->sin_addr.s_addr, gid->raw + 12, 4);
 192         } else {
 193                 struct sockaddr_in6 *out_in = (struct sockaddr_in6 *)out;
 194                 memset(out_in, 0, sizeof(*out_in));
 195                 out_in->sin6_family = AF_INET6;
 196                 memcpy(&out_in->sin6_addr.s6_addr, gid->raw, 16);
 197         }
 198 }
 199
 200 static inline void iboe_addr_get_sgid(struct rdma_dev_addr *dev_addr,
 201                                       union ib_gid *gid)
 202 {
 203         struct net_device *dev;
 204         struct in_device *ip4;
 205
 206         dev = dev_get_by_index(&init_net, dev_addr->bound_dev_if);
 207         if (dev) {
 208                 ip4 = (struct in_device *)dev->ip_ptr;
 209                 if (ip4 && ip4->ifa_list && ip4->ifa_list->ifa_address)
 210                         ipv6_addr_set_v4mapped(ip4->ifa_list->ifa_address,
 211                                                (struct in6_addr *)gid);
 212                 dev_put(dev);
 213         }
 214 }
 215
 216 static inline void rdma_addr_get_sgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid)
 217 {
 218         if (dev_addr->transport == RDMA_TRANSPORT_IB &&
 219             dev_addr->dev_type != ARPHRD_INFINIBAND)
 220                 iboe_addr_get_sgid(dev_addr, gid);
 221         else
 222                 memcpy(gid, dev_addr->src_dev_addr +
 223                        rdma_addr_gid_offset(dev_addr), sizeof *gid);
 224 }
 225
 226 static inline void rdma_addr_set_sgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid)
 227 {
 228         memcpy(dev_addr->src_dev_addr + rdma_addr_gid_offset(dev_addr), gid, sizeof *gid);
 229 }
 230
 231 static inline void rdma_addr_get_dgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid)
 232 {
 233         memcpy(gid, dev_addr->dst_dev_addr + rdma_addr_gid_offset(dev_addr), sizeof *gid);
 234 }
 235
 236 static inline void rdma_addr_set_dgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid)
 237 {
 238         memcpy(dev_addr->dst_dev_addr + rdma_addr_gid_offset(dev_addr), gid, sizeof *gid);
 239 }
 240
 241 static inline enum ib_mtu iboe_get_mtu(int mtu)
 242 {
 243         /*
 244          * reduce IB headers from effective IBoE MTU. 28 stands for
 245          * atomic header which is the biggest possible header after BTH
 246          */
 247         mtu = mtu - IB_GRH_BYTES - IB_BTH_BYTES - 28;
 248
 249         if (mtu >= ib_mtu_enum_to_int(IB_MTU_4096))
 250                 return IB_MTU_4096;
 251         else if (mtu >= ib_mtu_enum_to_int(IB_MTU_2048))
 252                 return IB_MTU_2048;
 253         else if (mtu >= ib_mtu_enum_to_int(IB_MTU_1024))
 254                 return IB_MTU_1024;
 255         else if (mtu >= ib_mtu_enum_to_int(IB_MTU_512))
 256                 return IB_MTU_512;
 257         else if (mtu >= ib_mtu_enum_to_int(IB_MTU_256))
 258                 return IB_MTU_256;
 259         else
 260                 return 0;
 261 }
 262
 263 static inline int iboe_get_rate(struct net_device *dev)
 264 {
 265         struct ethtool_link_ksettings cmd;
 266         int err;
 267
 268         rtnl_lock();
 269         err = __ethtool_get_link_ksettings(dev, &cmd);
 270         rtnl_unlock();
 271         if (err)
 272                 return IB_RATE_PORT_CURRENT;
 273
 274         if (cmd.base.speed >= 40000)
 275                 return IB_RATE_40_GBPS;
 276         else if (cmd.base.speed >= 30000)
 277                 return IB_RATE_30_GBPS;
 278         else if (cmd.base.speed >= 20000)
 279                 return IB_RATE_20_GBPS;
 280         else if (cmd.base.speed >= 10000)
 281                 return IB_RATE_10_GBPS;
 282         else
 283                 return IB_RATE_PORT_CURRENT;
 284 }
 285
 286 static inline int rdma_link_local_addr(struct in6_addr *addr)
 287 {
 288         if (addr->s6_addr32[0] == htonl(0xfe800000) &&
 289             addr->s6_addr32[1] == 0)
 290                 return 1;
 291
 292         return 0;
 293 }
 294
 295 static inline void rdma_get_ll_mac(struct in6_addr *addr, u8 *mac)
 296 {
 297         memcpy(mac, &addr->s6_addr[8], 3);
 298         memcpy(mac + 3, &addr->s6_addr[13], 3);
 299         mac[0] ^= 2;
 300 }
 301
 302 static inline int rdma_is_multicast_addr(struct in6_addr *addr)
 303 {
 304         return addr->s6_addr[0] == 0xff;
 305 }
 306
 307 static inline void rdma_get_mcast_mac(struct in6_addr *addr, u8 *mac)
 308 {
 309         int i;
 310
 311         mac[0] = 0x33;
 312         mac[1] = 0x33;
 313         for (i = 2; i < 6; ++i)
 314                 mac[i] = addr->s6_addr[i + 10];
 315 }
 316
 317 static inline u16 rdma_get_vlan_id(union ib_gid *dgid)
 318 {
 319         u16 vid;
 320
 321         vid = dgid->raw[11] << 8 | dgid->raw[12];
 322         return vid < 0x1000 ? vid : 0xffff;
 323 }
 324
 325 static inline struct net_device *rdma_vlan_dev_real_dev(const struct net_device *dev)
 326 {
 327         return dev->priv_flags & IFF_802_1Q_VLAN ?
 328                 vlan_dev_real_dev(dev) : NULL;
 329 }
 330
 331 #endif /* IB_ADDR_H */