linux/include/rdma/ib_addr.h
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   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/socket.h>
  42#include <linux/if_vlan.h>
  43#include <rdma/ib_verbs.h>
  44#include <rdma/ib_pack.h>
  45
  46struct rdma_addr_client {
  47        atomic_t refcount;
  48        struct completion comp;
  49};
  50
  51/**
  52 * rdma_addr_register_client - Register an address client.
  53 */
  54void rdma_addr_register_client(struct rdma_addr_client *client);
  55
  56/**
  57 * rdma_addr_unregister_client - Deregister an address client.
  58 * @client: Client object to deregister.
  59 */
  60void rdma_addr_unregister_client(struct rdma_addr_client *client);
  61
  62struct rdma_dev_addr {
  63        unsigned char src_dev_addr[MAX_ADDR_LEN];
  64        unsigned char dst_dev_addr[MAX_ADDR_LEN];
  65        unsigned char broadcast[MAX_ADDR_LEN];
  66        unsigned short dev_type;
  67        int bound_dev_if;
  68        enum rdma_transport_type transport;
  69};
  70
  71/**
  72 * rdma_translate_ip - Translate a local IP address to an RDMA hardware
  73 *   address.
  74 */
  75int rdma_translate_ip(struct sockaddr *addr, struct rdma_dev_addr *dev_addr);
  76
  77/**
  78 * rdma_resolve_ip - Resolve source and destination IP addresses to
  79 *   RDMA hardware addresses.
  80 * @client: Address client associated with request.
  81 * @src_addr: An optional source address to use in the resolution.  If a
  82 *   source address is not provided, a usable address will be returned via
  83 *   the callback.
  84 * @dst_addr: The destination address to resolve.
  85 * @addr: A reference to a data location that will receive the resolved
  86 *   addresses.  The data location must remain valid until the callback has
  87 *   been invoked.
  88 * @timeout_ms: Amount of time to wait for the address resolution to complete.
  89 * @callback: Call invoked once address resolution has completed, timed out,
  90 *   or been canceled.  A status of 0 indicates success.
  91 * @context: User-specified context associated with the call.
  92 */
  93int rdma_resolve_ip(struct rdma_addr_client *client,
  94                    struct sockaddr *src_addr, struct sockaddr *dst_addr,
  95                    struct rdma_dev_addr *addr, int timeout_ms,
  96                    void (*callback)(int status, struct sockaddr *src_addr,
  97                                     struct rdma_dev_addr *addr, void *context),
  98                    void *context);
  99
 100void rdma_addr_cancel(struct rdma_dev_addr *addr);
 101
 102int rdma_copy_addr(struct rdma_dev_addr *dev_addr, struct net_device *dev,
 103              const unsigned char *dst_dev_addr);
 104
 105static inline int ip_addr_size(struct sockaddr *addr)
 106{
 107        return addr->sa_family == AF_INET6 ?
 108               sizeof(struct sockaddr_in6) : sizeof(struct sockaddr_in);
 109}
 110
 111static inline u16 ib_addr_get_pkey(struct rdma_dev_addr *dev_addr)
 112{
 113        return ((u16)dev_addr->broadcast[8] << 8) | (u16)dev_addr->broadcast[9];
 114}
 115
 116static inline void ib_addr_set_pkey(struct rdma_dev_addr *dev_addr, u16 pkey)
 117{
 118        dev_addr->broadcast[8] = pkey >> 8;
 119        dev_addr->broadcast[9] = (unsigned char) pkey;
 120}
 121
 122static inline void ib_addr_get_mgid(struct rdma_dev_addr *dev_addr,
 123                                    union ib_gid *gid)
 124{
 125        memcpy(gid, dev_addr->broadcast + 4, sizeof *gid);
 126}
 127
 128static inline int rdma_addr_gid_offset(struct rdma_dev_addr *dev_addr)
 129{
 130        return dev_addr->dev_type == ARPHRD_INFINIBAND ? 4 : 0;
 131}
 132
 133static inline void iboe_mac_vlan_to_ll(union ib_gid *gid, u8 *mac, u16 vid)
 134{
 135        memset(gid->raw, 0, 16);
 136        *((__be32 *) gid->raw) = cpu_to_be32(0xfe800000);
 137        if (vid < 0x1000) {
 138                gid->raw[12] = vid & 0xff;
 139                gid->raw[11] = vid >> 8;
 140        } else {
 141                gid->raw[12] = 0xfe;
 142                gid->raw[11] = 0xff;
 143        }
 144        memcpy(gid->raw + 13, mac + 3, 3);
 145        memcpy(gid->raw + 8, mac, 3);
 146        gid->raw[8] ^= 2;
 147}
 148
 149static inline u16 rdma_vlan_dev_vlan_id(const struct net_device *dev)
 150{
 151        return dev->priv_flags & IFF_802_1Q_VLAN ?
 152                vlan_dev_vlan_id(dev) : 0xffff;
 153}
 154
 155static inline void iboe_addr_get_sgid(struct rdma_dev_addr *dev_addr,
 156                                      union ib_gid *gid)
 157{
 158        struct net_device *dev;
 159        u16 vid = 0xffff;
 160
 161        dev = dev_get_by_index(&init_net, dev_addr->bound_dev_if);
 162        if (dev) {
 163                vid = rdma_vlan_dev_vlan_id(dev);
 164                dev_put(dev);
 165        }
 166
 167        iboe_mac_vlan_to_ll(gid, dev_addr->src_dev_addr, vid);
 168}
 169
 170static inline void rdma_addr_get_sgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid)
 171{
 172        if (dev_addr->transport == RDMA_TRANSPORT_IB &&
 173            dev_addr->dev_type != ARPHRD_INFINIBAND)
 174                iboe_addr_get_sgid(dev_addr, gid);
 175        else
 176                memcpy(gid, dev_addr->src_dev_addr +
 177                       rdma_addr_gid_offset(dev_addr), sizeof *gid);
 178}
 179
 180static inline void rdma_addr_set_sgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid)
 181{
 182        memcpy(dev_addr->src_dev_addr + rdma_addr_gid_offset(dev_addr), gid, sizeof *gid);
 183}
 184
 185static inline void rdma_addr_get_dgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid)
 186{
 187        memcpy(gid, dev_addr->dst_dev_addr + rdma_addr_gid_offset(dev_addr), sizeof *gid);
 188}
 189
 190static inline void rdma_addr_set_dgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid)
 191{
 192        memcpy(dev_addr->dst_dev_addr + rdma_addr_gid_offset(dev_addr), gid, sizeof *gid);
 193}
 194
 195static inline enum ib_mtu iboe_get_mtu(int mtu)
 196{
 197        /*
 198         * reduce IB headers from effective IBoE MTU. 28 stands for
 199         * atomic header which is the biggest possible header after BTH
 200         */
 201        mtu = mtu - IB_GRH_BYTES - IB_BTH_BYTES - 28;
 202
 203        if (mtu >= ib_mtu_enum_to_int(IB_MTU_4096))
 204                return IB_MTU_4096;
 205        else if (mtu >= ib_mtu_enum_to_int(IB_MTU_2048))
 206                return IB_MTU_2048;
 207        else if (mtu >= ib_mtu_enum_to_int(IB_MTU_1024))
 208                return IB_MTU_1024;
 209        else if (mtu >= ib_mtu_enum_to_int(IB_MTU_512))
 210                return IB_MTU_512;
 211        else if (mtu >= ib_mtu_enum_to_int(IB_MTU_256))
 212                return IB_MTU_256;
 213        else
 214                return 0;
 215}
 216
 217static inline int iboe_get_rate(struct net_device *dev)
 218{
 219        struct ethtool_cmd cmd;
 220        u32 speed;
 221        int err;
 222
 223        rtnl_lock();
 224        err = __ethtool_get_settings(dev, &cmd);
 225        rtnl_unlock();
 226        if (err)
 227                return IB_RATE_PORT_CURRENT;
 228
 229        speed = ethtool_cmd_speed(&cmd);
 230        if (speed >= 40000)
 231                return IB_RATE_40_GBPS;
 232        else if (speed >= 30000)
 233                return IB_RATE_30_GBPS;
 234        else if (speed >= 20000)
 235                return IB_RATE_20_GBPS;
 236        else if (speed >= 10000)
 237                return IB_RATE_10_GBPS;
 238        else
 239                return IB_RATE_PORT_CURRENT;
 240}
 241
 242static inline int rdma_link_local_addr(struct in6_addr *addr)
 243{
 244        if (addr->s6_addr32[0] == htonl(0xfe800000) &&
 245            addr->s6_addr32[1] == 0)
 246                return 1;
 247
 248        return 0;
 249}
 250
 251static inline void rdma_get_ll_mac(struct in6_addr *addr, u8 *mac)
 252{
 253        memcpy(mac, &addr->s6_addr[8], 3);
 254        memcpy(mac + 3, &addr->s6_addr[13], 3);
 255        mac[0] ^= 2;
 256}
 257
 258static inline int rdma_is_multicast_addr(struct in6_addr *addr)
 259{
 260        return addr->s6_addr[0] == 0xff;
 261}
 262
 263static inline void rdma_get_mcast_mac(struct in6_addr *addr, u8 *mac)
 264{
 265        int i;
 266
 267        mac[0] = 0x33;
 268        mac[1] = 0x33;
 269        for (i = 2; i < 6; ++i)
 270                mac[i] = addr->s6_addr[i + 10];
 271}
 272
 273static inline u16 rdma_get_vlan_id(union ib_gid *dgid)
 274{
 275        u16 vid;
 276
 277        vid = dgid->raw[11] << 8 | dgid->raw[12];
 278        return vid < 0x1000 ? vid : 0xffff;
 279}
 280
 281static inline struct net_device *rdma_vlan_dev_real_dev(const struct net_device *dev)
 282{
 283        return dev->priv_flags & IFF_802_1Q_VLAN ?
 284                vlan_dev_real_dev(dev) : NULL;
 285}
 286
 287#endif /* IB_ADDR_H */
 288
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