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};
  87
  88/**
  89 * rdma_translate_ip - Translate a local IP address to an RDMA hardware
  90 *   address.
  91 *
  92 * The dev_addr->net field must be initialized.
  93 */
  94int rdma_translate_ip(struct sockaddr *addr, struct rdma_dev_addr *dev_addr,
  95                      u16 *vlan_id);
  96
  97/**
  98 * rdma_resolve_ip - Resolve source and destination IP addresses to
  99 *   RDMA hardware addresses.
 100 * @client: Address client associated with request.
 101 * @src_addr: An optional source address to use in the resolution.  If a
 102 *   source address is not provided, a usable address will be returned via
 103 *   the callback.
 104 * @dst_addr: The destination address to resolve.
 105 * @addr: A reference to a data location that will receive the resolved
 106 *   addresses.  The data location must remain valid until the callback has
 107 *   been invoked. The net field of the addr struct must be valid.
 108 * @timeout_ms: Amount of time to wait for the address resolution to complete.
 109 * @callback: Call invoked once address resolution has completed, timed out,
 110 *   or been canceled.  A status of 0 indicates success.
 111 * @context: User-specified context associated with the call.
 112 */
 113int rdma_resolve_ip(struct rdma_addr_client *client,
 114                    struct sockaddr *src_addr, struct sockaddr *dst_addr,
 115                    struct rdma_dev_addr *addr, int timeout_ms,
 116                    void (*callback)(int status, struct sockaddr *src_addr,
 117                                     struct rdma_dev_addr *addr, void *context),
 118                    void *context);
 119
 120void rdma_addr_cancel(struct rdma_dev_addr *addr);
 121
 122int rdma_copy_addr(struct rdma_dev_addr *dev_addr, struct net_device *dev,
 123              const unsigned char *dst_dev_addr);
 124
 125int rdma_addr_size(struct sockaddr *addr);
 126
 127int rdma_addr_find_smac_by_sgid(union ib_gid *sgid, u8 *smac, u16 *vlan_id);
 128int rdma_addr_find_dmac_by_grh(const union ib_gid *sgid, const union ib_gid *dgid,
 129                               u8 *smac, u16 *vlan_id, int if_index);
 130
 131static inline u16 ib_addr_get_pkey(struct rdma_dev_addr *dev_addr)
 132{
 133        return ((u16)dev_addr->broadcast[8] << 8) | (u16)dev_addr->broadcast[9];
 134}
 135
 136static inline void ib_addr_set_pkey(struct rdma_dev_addr *dev_addr, u16 pkey)
 137{
 138        dev_addr->broadcast[8] = pkey >> 8;
 139        dev_addr->broadcast[9] = (unsigned char) pkey;
 140}
 141
 142static inline void ib_addr_get_mgid(struct rdma_dev_addr *dev_addr,
 143                                    union ib_gid *gid)
 144{
 145        memcpy(gid, dev_addr->broadcast + 4, sizeof *gid);
 146}
 147
 148static inline int rdma_addr_gid_offset(struct rdma_dev_addr *dev_addr)
 149{
 150        return dev_addr->dev_type == ARPHRD_INFINIBAND ? 4 : 0;
 151}
 152
 153static inline u16 rdma_vlan_dev_vlan_id(const struct net_device *dev)
 154{
 155        return dev->priv_flags & IFF_802_1Q_VLAN ?
 156                vlan_dev_vlan_id(dev) : 0xffff;
 157}
 158
 159static inline int rdma_ip2gid(struct sockaddr *addr, union ib_gid *gid)
 160{
 161        switch (addr->sa_family) {
 162        case AF_INET:
 163                ipv6_addr_set_v4mapped(((struct sockaddr_in *)
 164                                        addr)->sin_addr.s_addr,
 165                                       (struct in6_addr *)gid);
 166                break;
 167        case AF_INET6:
 168                memcpy(gid->raw, &((struct sockaddr_in6 *)addr)->sin6_addr, 16);
 169                break;
 170        default:
 171                return -EINVAL;
 172        }
 173        return 0;
 174}
 175
 176/* Important - sockaddr should be a union of sockaddr_in and sockaddr_in6 */
 177static inline void rdma_gid2ip(struct sockaddr *out, const union ib_gid *gid)
 178{
 179        if (ipv6_addr_v4mapped((struct in6_addr *)gid)) {
 180                struct sockaddr_in *out_in = (struct sockaddr_in *)out;
 181                memset(out_in, 0, sizeof(*out_in));
 182                out_in->sin_family = AF_INET;
 183                memcpy(&out_in->sin_addr.s_addr, gid->raw + 12, 4);
 184        } else {
 185                struct sockaddr_in6 *out_in = (struct sockaddr_in6 *)out;
 186                memset(out_in, 0, sizeof(*out_in));
 187                out_in->sin6_family = AF_INET6;
 188                memcpy(&out_in->sin6_addr.s6_addr, gid->raw, 16);
 189        }
 190}
 191
 192static inline void iboe_addr_get_sgid(struct rdma_dev_addr *dev_addr,
 193                                      union ib_gid *gid)
 194{
 195        struct net_device *dev;
 196        struct in_device *ip4;
 197
 198        dev = dev_get_by_index(&init_net, dev_addr->bound_dev_if);
 199        if (dev) {
 200                ip4 = (struct in_device *)dev->ip_ptr;
 201                if (ip4 && ip4->ifa_list && ip4->ifa_list->ifa_address)
 202                        ipv6_addr_set_v4mapped(ip4->ifa_list->ifa_address,
 203                                               (struct in6_addr *)gid);
 204                dev_put(dev);
 205        }
 206}
 207
 208static inline void rdma_addr_get_sgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid)
 209{
 210        if (dev_addr->transport == RDMA_TRANSPORT_IB &&
 211            dev_addr->dev_type != ARPHRD_INFINIBAND)
 212                iboe_addr_get_sgid(dev_addr, gid);
 213        else
 214                memcpy(gid, dev_addr->src_dev_addr +
 215                       rdma_addr_gid_offset(dev_addr), sizeof *gid);
 216}
 217
 218static inline void rdma_addr_set_sgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid)
 219{
 220        memcpy(dev_addr->src_dev_addr + rdma_addr_gid_offset(dev_addr), gid, sizeof *gid);
 221}
 222
 223static inline void rdma_addr_get_dgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid)
 224{
 225        memcpy(gid, dev_addr->dst_dev_addr + rdma_addr_gid_offset(dev_addr), sizeof *gid);
 226}
 227
 228static inline void rdma_addr_set_dgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid)
 229{
 230        memcpy(dev_addr->dst_dev_addr + rdma_addr_gid_offset(dev_addr), gid, sizeof *gid);
 231}
 232
 233static inline enum ib_mtu iboe_get_mtu(int mtu)
 234{
 235        /*
 236         * reduce IB headers from effective IBoE MTU. 28 stands for
 237         * atomic header which is the biggest possible header after BTH
 238         */
 239        mtu = mtu - IB_GRH_BYTES - IB_BTH_BYTES - 28;
 240
 241        if (mtu >= ib_mtu_enum_to_int(IB_MTU_4096))
 242                return IB_MTU_4096;
 243        else if (mtu >= ib_mtu_enum_to_int(IB_MTU_2048))
 244                return IB_MTU_2048;
 245        else if (mtu >= ib_mtu_enum_to_int(IB_MTU_1024))
 246                return IB_MTU_1024;
 247        else if (mtu >= ib_mtu_enum_to_int(IB_MTU_512))
 248                return IB_MTU_512;
 249        else if (mtu >= ib_mtu_enum_to_int(IB_MTU_256))
 250                return IB_MTU_256;
 251        else
 252                return 0;
 253}
 254
 255static inline int iboe_get_rate(struct net_device *dev)
 256{
 257        struct ethtool_cmd cmd;
 258        u32 speed;
 259        int err;
 260
 261        rtnl_lock();
 262        err = __ethtool_get_settings(dev, &cmd);
 263        rtnl_unlock();
 264        if (err)
 265                return IB_RATE_PORT_CURRENT;
 266
 267        speed = ethtool_cmd_speed(&cmd);
 268        if (speed >= 40000)
 269                return IB_RATE_40_GBPS;
 270        else if (speed >= 30000)
 271                return IB_RATE_30_GBPS;
 272        else if (speed >= 20000)
 273                return IB_RATE_20_GBPS;
 274        else if (speed >= 10000)
 275                return IB_RATE_10_GBPS;
 276        else
 277                return IB_RATE_PORT_CURRENT;
 278}
 279
 280static inline int rdma_link_local_addr(struct in6_addr *addr)
 281{
 282        if (addr->s6_addr32[0] == htonl(0xfe800000) &&
 283            addr->s6_addr32[1] == 0)
 284                return 1;
 285
 286        return 0;
 287}
 288
 289static inline void rdma_get_ll_mac(struct in6_addr *addr, u8 *mac)
 290{
 291        memcpy(mac, &addr->s6_addr[8], 3);
 292        memcpy(mac + 3, &addr->s6_addr[13], 3);
 293        mac[0] ^= 2;
 294}
 295
 296static inline int rdma_is_multicast_addr(struct in6_addr *addr)
 297{
 298        return addr->s6_addr[0] == 0xff;
 299}
 300
 301static inline void rdma_get_mcast_mac(struct in6_addr *addr, u8 *mac)
 302{
 303        int i;
 304
 305        mac[0] = 0x33;
 306        mac[1] = 0x33;
 307        for (i = 2; i < 6; ++i)
 308                mac[i] = addr->s6_addr[i + 10];
 309}
 310
 311static inline u16 rdma_get_vlan_id(union ib_gid *dgid)
 312{
 313        u16 vid;
 314
 315        vid = dgid->raw[11] << 8 | dgid->raw[12];
 316        return vid < 0x1000 ? vid : 0xffff;
 317}
 318
 319static inline struct net_device *rdma_vlan_dev_real_dev(const struct net_device *dev)
 320{
 321        return dev->priv_flags & IFF_802_1Q_VLAN ?
 322                vlan_dev_real_dev(dev) : NULL;
 323}
 324
 325#endif /* IB_ADDR_H */
 326