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
  51 struct rdma_addr_client {
  52         atomic_t refcount;
  53         struct completion comp;
  54 };
  55
  56 /**
  57  * rdma_addr_register_client - Register an address client.
  58  */
  59 void rdma_addr_register_client(struct rdma_addr_client *client);
  60
  61 /**
  62  * rdma_addr_unregister_client - Deregister an address client.
  63  * @client: Client object to deregister.
  64  */
  65 void rdma_addr_unregister_client(struct rdma_addr_client *client);
  66
  67 struct rdma_dev_addr {
  68         unsigned char src_dev_addr[MAX_ADDR_LEN];
  69         unsigned char dst_dev_addr[MAX_ADDR_LEN];
  70         unsigned char broadcast[MAX_ADDR_LEN];
  71         unsigned short dev_type;
  72         int bound_dev_if;
  73         enum rdma_transport_type transport;
  74 };
  75
  76 /**
  77  * rdma_translate_ip - Translate a local IP address to an RDMA hardware
  78  *   address.
  79  */
  80 int rdma_translate_ip(struct sockaddr *addr, struct rdma_dev_addr *dev_addr,
  81                       u16 *vlan_id);
  82
  83 /**
  84  * rdma_resolve_ip - Resolve source and destination IP addresses to
  85  *   RDMA hardware addresses.
  86  * @client: Address client associated with request.
  87  * @src_addr: An optional source address to use in the resolution.  If a
  88  *   source address is not provided, a usable address will be returned via
  89  *   the callback.
  90  * @dst_addr: The destination address to resolve.
  91  * @addr: A reference to a data location that will receive the resolved
  92  *   addresses.  The data location must remain valid until the callback has
  93  *   been invoked.
  94  * @timeout_ms: Amount of time to wait for the address resolution to complete.
  95  * @callback: Call invoked once address resolution has completed, timed out,
  96  *   or been canceled.  A status of 0 indicates success.
  97  * @context: User-specified context associated with the call.
  98  */
  99 int rdma_resolve_ip(struct rdma_addr_client *client,
 100                     struct sockaddr *src_addr, struct sockaddr *dst_addr,
 101                     struct rdma_dev_addr *addr, int timeout_ms,
 102                     void (*callback)(int status, struct sockaddr *src_addr,
 103                                      struct rdma_dev_addr *addr, void *context),
 104                     void *context);
 105
 106 void rdma_addr_cancel(struct rdma_dev_addr *addr);
 107
 108 int rdma_copy_addr(struct rdma_dev_addr *dev_addr, struct net_device *dev,
 109               const unsigned char *dst_dev_addr);
 110
 111 int rdma_addr_size(struct sockaddr *addr);
 112
 113 int rdma_addr_find_smac_by_sgid(union ib_gid *sgid, u8 *smac, u16 *vlan_id);
 114 int rdma_addr_find_dmac_by_grh(union ib_gid *sgid, union ib_gid *dgid, u8 *smac,
 115                                u16 *vlan_id);
 116
 117 static inline u16 ib_addr_get_pkey(struct rdma_dev_addr *dev_addr)
 118 {
 119         return ((u16)dev_addr->broadcast[8] << 8) | (u16)dev_addr->broadcast[9];
 120 }
 121
 122 static inline void ib_addr_set_pkey(struct rdma_dev_addr *dev_addr, u16 pkey)
 123 {
 124         dev_addr->broadcast[8] = pkey >> 8;
 125         dev_addr->broadcast[9] = (unsigned char) pkey;
 126 }
 127
 128 static inline void ib_addr_get_mgid(struct rdma_dev_addr *dev_addr,
 129                                     union ib_gid *gid)
 130 {
 131         memcpy(gid, dev_addr->broadcast + 4, sizeof *gid);
 132 }
 133
 134 static inline int rdma_addr_gid_offset(struct rdma_dev_addr *dev_addr)
 135 {
 136         return dev_addr->dev_type == ARPHRD_INFINIBAND ? 4 : 0;
 137 }
 138
 139 static inline u16 rdma_vlan_dev_vlan_id(const struct net_device *dev)
 140 {
 141         return dev->priv_flags & IFF_802_1Q_VLAN ?
 142                 vlan_dev_vlan_id(dev) : 0xffff;
 143 }
 144
 145 static inline int rdma_ip2gid(struct sockaddr *addr, union ib_gid *gid)
 146 {
 147         switch (addr->sa_family) {
 148         case AF_INET:
 149                 ipv6_addr_set_v4mapped(((struct sockaddr_in *)
 150                                         addr)->sin_addr.s_addr,
 151                                        (struct in6_addr *)gid);
 152                 break;
 153         case AF_INET6:
 154                 memcpy(gid->raw, &((struct sockaddr_in6 *)addr)->sin6_addr, 16);
 155                 break;
 156         default:
 157                 return -EINVAL;
 158         }
 159         return 0;
 160 }
 161
 162 /* Important - sockaddr should be a union of sockaddr_in and sockaddr_in6 */
 163 static inline void rdma_gid2ip(struct sockaddr *out, union ib_gid *gid)
 164 {
 165         if (ipv6_addr_v4mapped((struct in6_addr *)gid)) {
 166                 struct sockaddr_in *out_in = (struct sockaddr_in *)out;
 167                 memset(out_in, 0, sizeof(*out_in));
 168                 out_in->sin_family = AF_INET;
 169                 memcpy(&out_in->sin_addr.s_addr, gid->raw + 12, 4);
 170         } else {
 171                 struct sockaddr_in6 *out_in = (struct sockaddr_in6 *)out;
 172                 memset(out_in, 0, sizeof(*out_in));
 173                 out_in->sin6_family = AF_INET6;
 174                 memcpy(&out_in->sin6_addr.s6_addr, gid->raw, 16);
 175         }
 176 }
 177
 178 static inline void iboe_addr_get_sgid(struct rdma_dev_addr *dev_addr,
 179                                       union ib_gid *gid)
 180 {
 181         struct net_device *dev;
 182         struct in_device *ip4;
 183
 184         dev = dev_get_by_index(&init_net, dev_addr->bound_dev_if);
 185         if (dev) {
 186                 ip4 = in_dev_get(dev);
 187                 if (ip4 && ip4->ifa_list && ip4->ifa_list->ifa_address) {
 188                         ipv6_addr_set_v4mapped(ip4->ifa_list->ifa_address,
 189                                                (struct in6_addr *)gid);
 190                         in_dev_put(ip4);
 191                 }
 192                 dev_put(dev);
 193         }
 194 }
 195
 196 static inline void rdma_addr_get_sgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid)
 197 {
 198         if (dev_addr->transport == RDMA_TRANSPORT_IB &&
 199             dev_addr->dev_type != ARPHRD_INFINIBAND)
 200                 iboe_addr_get_sgid(dev_addr, gid);
 201         else
 202                 memcpy(gid, dev_addr->src_dev_addr +
 203                        rdma_addr_gid_offset(dev_addr), sizeof *gid);
 204 }
 205
 206 static inline void rdma_addr_set_sgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid)
 207 {
 208         memcpy(dev_addr->src_dev_addr + rdma_addr_gid_offset(dev_addr), gid, sizeof *gid);
 209 }
 210
 211 static inline void rdma_addr_get_dgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid)
 212 {
 213         memcpy(gid, dev_addr->dst_dev_addr + rdma_addr_gid_offset(dev_addr), sizeof *gid);
 214 }
 215
 216 static inline void rdma_addr_set_dgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid)
 217 {
 218         memcpy(dev_addr->dst_dev_addr + rdma_addr_gid_offset(dev_addr), gid, sizeof *gid);
 219 }
 220
 221 static inline enum ib_mtu iboe_get_mtu(int mtu)
 222 {
 223         /*
 224          * reduce IB headers from effective IBoE MTU. 28 stands for
 225          * atomic header which is the biggest possible header after BTH
 226          */
 227         mtu = mtu - IB_GRH_BYTES - IB_BTH_BYTES - 28;
 228
 229         if (mtu >= ib_mtu_enum_to_int(IB_MTU_4096))
 230                 return IB_MTU_4096;
 231         else if (mtu >= ib_mtu_enum_to_int(IB_MTU_2048))
 232                 return IB_MTU_2048;
 233         else if (mtu >= ib_mtu_enum_to_int(IB_MTU_1024))
 234                 return IB_MTU_1024;
 235         else if (mtu >= ib_mtu_enum_to_int(IB_MTU_512))
 236                 return IB_MTU_512;
 237         else if (mtu >= ib_mtu_enum_to_int(IB_MTU_256))
 238                 return IB_MTU_256;
 239         else
 240                 return 0;
 241 }
 242
 243 static inline int iboe_get_rate(struct net_device *dev)
 244 {
 245         struct ethtool_cmd cmd;
 246         u32 speed;
 247         int err;
 248
 249         rtnl_lock();
 250         err = __ethtool_get_settings(dev, &cmd);
 251         rtnl_unlock();
 252         if (err)
 253                 return IB_RATE_PORT_CURRENT;
 254
 255         speed = ethtool_cmd_speed(&cmd);
 256         if (speed >= 40000)
 257                 return IB_RATE_40_GBPS;
 258         else if (speed >= 30000)
 259                 return IB_RATE_30_GBPS;
 260         else if (speed >= 20000)
 261                 return IB_RATE_20_GBPS;
 262         else if (speed >= 10000)
 263                 return IB_RATE_10_GBPS;
 264         else
 265                 return IB_RATE_PORT_CURRENT;
 266 }
 267
 268 static inline int rdma_link_local_addr(struct in6_addr *addr)
 269 {
 270         if (addr->s6_addr32[0] == htonl(0xfe800000) &&
 271             addr->s6_addr32[1] == 0)
 272                 return 1;
 273
 274         return 0;
 275 }
 276
 277 static inline void rdma_get_ll_mac(struct in6_addr *addr, u8 *mac)
 278 {
 279         memcpy(mac, &addr->s6_addr[8], 3);
 280         memcpy(mac + 3, &addr->s6_addr[13], 3);
 281         mac[0] ^= 2;
 282 }
 283
 284 static inline int rdma_is_multicast_addr(struct in6_addr *addr)
 285 {
 286         return addr->s6_addr[0] == 0xff;
 287 }
 288
 289 static inline void rdma_get_mcast_mac(struct in6_addr *addr, u8 *mac)
 290 {
 291         int i;
 292
 293         mac[0] = 0x33;
 294         mac[1] = 0x33;
 295         for (i = 2; i < 6; ++i)
 296                 mac[i] = addr->s6_addr[i + 10];
 297 }
 298
 299 static inline u16 rdma_get_vlan_id(union ib_gid *dgid)
 300 {
 301         u16 vid;
 302
 303         vid = dgid->raw[11] << 8 | dgid->raw[12];
 304         return vid < 0x1000 ? vid : 0xffff;
 305 }
 306
 307 static inline struct net_device *rdma_vlan_dev_real_dev(const struct net_device *dev)
 308 {
 309         return dev->priv_flags & IFF_802_1Q_VLAN ?
 310                 vlan_dev_real_dev(dev) : NULL;
 311 }
 312
 313 #endif /* IB_ADDR_H */