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/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
 105int rdma_addr_size(struct sockaddr *addr);
 106
 107static inline u16 ib_addr_get_pkey(struct rdma_dev_addr *dev_addr)
 108{
 109        return ((u16)dev_addr->broadcast[8] << 8) | (u16)dev_addr->broadcast[9];
 110}
 111
 112static inline void ib_addr_set_pkey(struct rdma_dev_addr *dev_addr, u16 pkey)
 113{
 114        dev_addr->broadcast[8] = pkey >> 8;
 115        dev_addr->broadcast[9] = (unsigned char) pkey;
 116}
 117
 118static inline void ib_addr_get_mgid(struct rdma_dev_addr *dev_addr,
 119                                    union ib_gid *gid)
 120{
 121        memcpy(gid, dev_addr->broadcast + 4, sizeof *gid);
 122}
 123
 124static inline int rdma_addr_gid_offset(struct rdma_dev_addr *dev_addr)
 125{
 126        return dev_addr->dev_type == ARPHRD_INFINIBAND ? 4 : 0;
 127}
 128
 129static inline void iboe_mac_vlan_to_ll(union ib_gid *gid, u8 *mac, u16 vid)
 130{
 131        memset(gid->raw, 0, 16);
 132        *((__be32 *) gid->raw) = cpu_to_be32(0xfe800000);
 133        if (vid < 0x1000) {
 134                gid->raw[12] = vid & 0xff;
 135                gid->raw[11] = vid >> 8;
 136        } else {
 137                gid->raw[12] = 0xfe;
 138                gid->raw[11] = 0xff;
 139        }
 140        memcpy(gid->raw + 13, mac + 3, 3);
 141        memcpy(gid->raw + 8, mac, 3);
 142        gid->raw[8] ^= 2;
 143}
 144
 145static inline u16 rdma_vlan_dev_vlan_id(const struct net_device *dev)
 146{
 147        return dev->priv_flags & IFF_802_1Q_VLAN ?
 148                vlan_dev_vlan_id(dev) : 0xffff;
 149}
 150
 151static inline void iboe_addr_get_sgid(struct rdma_dev_addr *dev_addr,
 152                                      union ib_gid *gid)
 153{
 154        struct net_device *dev;
 155        u16 vid = 0xffff;
 156
 157        dev = dev_get_by_index(&init_net, dev_addr->bound_dev_if);
 158        if (dev) {
 159                vid = rdma_vlan_dev_vlan_id(dev);
 160                dev_put(dev);
 161        }
 162
 163        iboe_mac_vlan_to_ll(gid, dev_addr->src_dev_addr, vid);
 164}
 165
 166static inline void rdma_addr_get_sgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid)
 167{
 168        if (dev_addr->transport == RDMA_TRANSPORT_IB &&
 169            dev_addr->dev_type != ARPHRD_INFINIBAND)
 170                iboe_addr_get_sgid(dev_addr, gid);
 171        else
 172                memcpy(gid, dev_addr->src_dev_addr +
 173                       rdma_addr_gid_offset(dev_addr), sizeof *gid);
 174}
 175
 176static inline void rdma_addr_set_sgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid)
 177{
 178        memcpy(dev_addr->src_dev_addr + rdma_addr_gid_offset(dev_addr), gid, sizeof *gid);
 179}
 180
 181static inline void rdma_addr_get_dgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid)
 182{
 183        memcpy(gid, dev_addr->dst_dev_addr + rdma_addr_gid_offset(dev_addr), sizeof *gid);
 184}
 185
 186static inline void rdma_addr_set_dgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid)
 187{
 188        memcpy(dev_addr->dst_dev_addr + rdma_addr_gid_offset(dev_addr), gid, sizeof *gid);
 189}
 190
 191static inline enum ib_mtu iboe_get_mtu(int mtu)
 192{
 193        /*
 194         * reduce IB headers from effective IBoE MTU. 28 stands for
 195         * atomic header which is the biggest possible header after BTH
 196         */
 197        mtu = mtu - IB_GRH_BYTES - IB_BTH_BYTES - 28;
 198
 199        if (mtu >= ib_mtu_enum_to_int(IB_MTU_4096))
 200                return IB_MTU_4096;
 201        else if (mtu >= ib_mtu_enum_to_int(IB_MTU_2048))
 202                return IB_MTU_2048;
 203        else if (mtu >= ib_mtu_enum_to_int(IB_MTU_1024))
 204                return IB_MTU_1024;
 205        else if (mtu >= ib_mtu_enum_to_int(IB_MTU_512))
 206                return IB_MTU_512;
 207        else if (mtu >= ib_mtu_enum_to_int(IB_MTU_256))
 208                return IB_MTU_256;
 209        else
 210                return 0;
 211}
 212
 213static inline int iboe_get_rate(struct net_device *dev)
 214{
 215        struct ethtool_cmd cmd;
 216        u32 speed;
 217        int err;
 218
 219        rtnl_lock();
 220        err = __ethtool_get_settings(dev, &cmd);
 221        rtnl_unlock();
 222        if (err)
 223                return IB_RATE_PORT_CURRENT;
 224
 225        speed = ethtool_cmd_speed(&cmd);
 226        if (speed >= 40000)
 227                return IB_RATE_40_GBPS;
 228        else if (speed >= 30000)
 229                return IB_RATE_30_GBPS;
 230        else if (speed >= 20000)
 231                return IB_RATE_20_GBPS;
 232        else if (speed >= 10000)
 233                return IB_RATE_10_GBPS;
 234        else
 235                return IB_RATE_PORT_CURRENT;
 236}
 237
 238static inline int rdma_link_local_addr(struct in6_addr *addr)
 239{
 240        if (addr->s6_addr32[0] == htonl(0xfe800000) &&
 241            addr->s6_addr32[1] == 0)
 242                return 1;
 243
 244        return 0;
 245}
 246
 247static inline void rdma_get_ll_mac(struct in6_addr *addr, u8 *mac)
 248{
 249        memcpy(mac, &addr->s6_addr[8], 3);
 250        memcpy(mac + 3, &addr->s6_addr[13], 3);
 251        mac[0] ^= 2;
 252}
 253
 254static inline int rdma_is_multicast_addr(struct in6_addr *addr)
 255{
 256        return addr->s6_addr[0] == 0xff;
 257}
 258
 259static inline void rdma_get_mcast_mac(struct in6_addr *addr, u8 *mac)
 260{
 261        int i;
 262
 263        mac[0] = 0x33;
 264        mac[1] = 0x33;
 265        for (i = 2; i < 6; ++i)
 266                mac[i] = addr->s6_addr[i + 10];
 267}
 268
 269static inline u16 rdma_get_vlan_id(union ib_gid *dgid)
 270{
 271        u16 vid;
 272
 273        vid = dgid->raw[11] << 8 | dgid->raw[12];
 274        return vid < 0x1000 ? vid : 0xffff;
 275}
 276
 277static inline struct net_device *rdma_vlan_dev_real_dev(const struct net_device *dev)
 278{
 279        return dev->priv_flags & IFF_802_1Q_VLAN ?
 280                vlan_dev_real_dev(dev) : NULL;
 281}
 282
 283#endif /* IB_ADDR_H */
 284