LXR linux/include/rdma/ib

   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
  52struct rdma_addr_client {
  53        atomic_t refcount;
  54        struct completion comp;
  55};
  56
  57/**
  58 * rdma_addr_register_client - Register an address client.
  59 */
  60void 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 */
  66void 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 */
  78struct 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 */
  96int 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 */
 115int 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
 122int rdma_resolve_ip_route(struct sockaddr *src_addr,
 123                          const struct sockaddr *dst_addr,
 124                          struct rdma_dev_addr *addr);
 125
 126void rdma_addr_cancel(struct rdma_dev_addr *addr);
 127
 128int rdma_copy_addr(struct rdma_dev_addr *dev_addr, struct net_device *dev,
 129              const unsigned char *dst_dev_addr);
 130
 131int rdma_addr_size(struct sockaddr *addr);
 132
 133int rdma_addr_find_smac_by_sgid(union ib_gid *sgid, u8 *smac, u16 *vlan_id);
 134int 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
 139static 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
 144static 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
 150static 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
 156static 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
 161static inline u16 rdma_vlan_dev_vlan_id(const struct net_device *dev)
 162{
 163        return is_vlan_dev(dev) ? vlan_dev_vlan_id(dev) : 0xffff;
 164}
 165
 166static inline int rdma_ip2gid(struct sockaddr *addr, union ib_gid *gid)
 167{
 168        switch (addr->sa_family) {
 169        case AF_INET:
 170                ipv6_addr_set_v4mapped(((struct sockaddr_in *)
 171                                        addr)->sin_addr.s_addr,
 172                                       (struct in6_addr *)gid);
 173                break;
 174        case AF_INET6:
 175                *(struct in6_addr *)&gid->raw =
 176                        ((struct sockaddr_in6 *)addr)->sin6_addr;
 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 */
 185static 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
 200static 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 = in_dev_get(dev);
 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
 213                if (ip4)
 214                        in_dev_put(ip4);
 215
 216                dev_put(dev);
 217        }
 218}
 219
 220static inline void rdma_addr_get_sgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid)
 221{
 222        if (dev_addr->transport == RDMA_TRANSPORT_IB &&
 223            dev_addr->dev_type != ARPHRD_INFINIBAND)
 224                iboe_addr_get_sgid(dev_addr, gid);
 225        else
 226                memcpy(gid, dev_addr->src_dev_addr +
 227                       rdma_addr_gid_offset(dev_addr), sizeof *gid);
 228}
 229
 230static inline void rdma_addr_set_sgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid)
 231{
 232        memcpy(dev_addr->src_dev_addr + rdma_addr_gid_offset(dev_addr), gid, sizeof *gid);
 233}
 234
 235static inline void rdma_addr_get_dgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid)
 236{
 237        memcpy(gid, dev_addr->dst_dev_addr + rdma_addr_gid_offset(dev_addr), sizeof *gid);
 238}
 239
 240static inline void rdma_addr_set_dgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid)
 241{
 242        memcpy(dev_addr->dst_dev_addr + rdma_addr_gid_offset(dev_addr), gid, sizeof *gid);
 243}
 244
 245static inline enum ib_mtu iboe_get_mtu(int mtu)
 246{
 247        /*
 248         * reduce IB headers from effective IBoE MTU. 28 stands for
 249         * atomic header which is the biggest possible header after BTH
 250         */
 251        mtu = mtu - IB_GRH_BYTES - IB_BTH_BYTES - 28;
 252
 253        if (mtu >= ib_mtu_enum_to_int(IB_MTU_4096))
 254                return IB_MTU_4096;
 255        else if (mtu >= ib_mtu_enum_to_int(IB_MTU_2048))
 256                return IB_MTU_2048;
 257        else if (mtu >= ib_mtu_enum_to_int(IB_MTU_1024))
 258                return IB_MTU_1024;
 259        else if (mtu >= ib_mtu_enum_to_int(IB_MTU_512))
 260                return IB_MTU_512;
 261        else if (mtu >= ib_mtu_enum_to_int(IB_MTU_256))
 262                return IB_MTU_256;
 263        else
 264                return 0;
 265}
 266
 267static inline int iboe_get_rate(struct net_device *dev)
 268{
 269        struct ethtool_link_ksettings cmd;
 270        int err;
 271
 272        rtnl_lock();
 273        err = __ethtool_get_link_ksettings(dev, &cmd);
 274        rtnl_unlock();
 275        if (err)
 276                return IB_RATE_PORT_CURRENT;
 277
 278        if (cmd.base.speed >= 40000)
 279                return IB_RATE_40_GBPS;
 280        else if (cmd.base.speed >= 30000)
 281                return IB_RATE_30_GBPS;
 282        else if (cmd.base.speed >= 20000)
 283                return IB_RATE_20_GBPS;
 284        else if (cmd.base.speed >= 10000)
 285                return IB_RATE_10_GBPS;
 286        else
 287                return IB_RATE_PORT_CURRENT;
 288}
 289
 290static inline int rdma_link_local_addr(struct in6_addr *addr)
 291{
 292        if (addr->s6_addr32[0] == htonl(0xfe800000) &&
 293            addr->s6_addr32[1] == 0)
 294                return 1;
 295
 296        return 0;
 297}
 298
 299static inline void rdma_get_ll_mac(struct in6_addr *addr, u8 *mac)
 300{
 301        memcpy(mac, &addr->s6_addr[8], 3);
 302        memcpy(mac + 3, &addr->s6_addr[13], 3);
 303        mac[0] ^= 2;
 304}
 305
 306static inline int rdma_is_multicast_addr(struct in6_addr *addr)
 307{
 308        u32 ipv4_addr;
 309
 310        if (addr->s6_addr[0] == 0xff)
 311                return 1;
 312
 313        memcpy(&ipv4_addr, addr->s6_addr + 12, 4);
 314        return (ipv6_addr_v4mapped(addr) && ipv4_is_multicast(ipv4_addr));
 315}
 316
 317static inline void rdma_get_mcast_mac(struct in6_addr *addr, u8 *mac)
 318{
 319        int i;
 320
 321        mac[0] = 0x33;
 322        mac[1] = 0x33;
 323        for (i = 2; i < 6; ++i)
 324                mac[i] = addr->s6_addr[i + 10];
 325}
 326
 327static inline u16 rdma_get_vlan_id(union ib_gid *dgid)
 328{
 329        u16 vid;
 330
 331        vid = dgid->raw[11] << 8 | dgid->raw[12];
 332        return vid < 0x1000 ? vid : 0xffff;
 333}
 334
 335static inline struct net_device *rdma_vlan_dev_real_dev(const struct net_device *dev)
 336{
 337        return is_vlan_dev(dev) ? vlan_dev_real_dev(dev) : NULL;
 338}
 339
 340#endif /* IB_ADDR_H */
 341