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/net_namespace.h>
  50
  51/**
  52 * struct rdma_dev_addr - Contains resolved RDMA hardware addresses
  53 * @src_dev_addr:       Source MAC address.
  54 * @dst_dev_addr:       Destination MAC address.
  55 * @broadcast:          Broadcast address of the device.
  56 * @dev_type:           The interface hardware type of the device.
  57 * @bound_dev_if:       An optional device interface index.
  58 * @transport:          The transport type used.
  59 * @net:                Network namespace containing the bound_dev_if net_dev.
  60 * @sgid_attr:          GID attribute to use for identified SGID
  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        struct net *net;
  70        const struct ib_gid_attr *sgid_attr;
  71        enum rdma_network_type network;
  72        int hoplimit;
  73};
  74
  75/**
  76 * rdma_translate_ip - Translate a local IP address to an RDMA hardware
  77 *   address.
  78 *
  79 * The dev_addr->net field must be initialized.
  80 */
  81int rdma_translate_ip(const struct sockaddr *addr,
  82                      struct rdma_dev_addr *dev_addr);
  83
  84/**
  85 * rdma_resolve_ip - Resolve source and destination IP addresses to
  86 *   RDMA hardware addresses.
  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. The net field of the addr struct must be valid.
  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 * @resolve_by_gid_attr:        Resolve the ip based on the GID attribute from
  98 *                              rdma_dev_addr.
  99 * @context: User-specified context associated with the call.
 100 */
 101int rdma_resolve_ip(struct sockaddr *src_addr, const struct sockaddr *dst_addr,
 102                    struct rdma_dev_addr *addr, unsigned long timeout_ms,
 103                    void (*callback)(int status, struct sockaddr *src_addr,
 104                                     struct rdma_dev_addr *addr, void *context),
 105                    bool resolve_by_gid_attr, void *context);
 106
 107void rdma_addr_cancel(struct rdma_dev_addr *addr);
 108
 109int rdma_addr_size(const struct sockaddr *addr);
 110int rdma_addr_size_in6(struct sockaddr_in6 *addr);
 111int rdma_addr_size_kss(struct __kernel_sockaddr_storage *addr);
 112
 113static inline u16 ib_addr_get_pkey(struct rdma_dev_addr *dev_addr)
 114{
 115        return ((u16)dev_addr->broadcast[8] << 8) | (u16)dev_addr->broadcast[9];
 116}
 117
 118static inline void ib_addr_set_pkey(struct rdma_dev_addr *dev_addr, u16 pkey)
 119{
 120        dev_addr->broadcast[8] = pkey >> 8;
 121        dev_addr->broadcast[9] = (unsigned char) pkey;
 122}
 123
 124static inline void ib_addr_get_mgid(struct rdma_dev_addr *dev_addr,
 125                                    union ib_gid *gid)
 126{
 127        memcpy(gid, dev_addr->broadcast + 4, sizeof *gid);
 128}
 129
 130static inline int rdma_addr_gid_offset(struct rdma_dev_addr *dev_addr)
 131{
 132        return dev_addr->dev_type == ARPHRD_INFINIBAND ? 4 : 0;
 133}
 134
 135static inline u16 rdma_vlan_dev_vlan_id(const struct net_device *dev)
 136{
 137        return is_vlan_dev(dev) ? vlan_dev_vlan_id(dev) : 0xffff;
 138}
 139
 140static inline int rdma_ip2gid(struct sockaddr *addr, union ib_gid *gid)
 141{
 142        switch (addr->sa_family) {
 143        case AF_INET:
 144                ipv6_addr_set_v4mapped(((struct sockaddr_in *)
 145                                        addr)->sin_addr.s_addr,
 146                                       (struct in6_addr *)gid);
 147                break;
 148        case AF_INET6:
 149                *(struct in6_addr *)&gid->raw =
 150                        ((struct sockaddr_in6 *)addr)->sin6_addr;
 151                break;
 152        default:
 153                return -EINVAL;
 154        }
 155        return 0;
 156}
 157
 158/* Important - sockaddr should be a union of sockaddr_in and sockaddr_in6 */
 159static inline void rdma_gid2ip(struct sockaddr *out, const union ib_gid *gid)
 160{
 161        if (ipv6_addr_v4mapped((struct in6_addr *)gid)) {
 162                struct sockaddr_in *out_in = (struct sockaddr_in *)out;
 163                memset(out_in, 0, sizeof(*out_in));
 164                out_in->sin_family = AF_INET;
 165                memcpy(&out_in->sin_addr.s_addr, gid->raw + 12, 4);
 166        } else {
 167                struct sockaddr_in6 *out_in = (struct sockaddr_in6 *)out;
 168                memset(out_in, 0, sizeof(*out_in));
 169                out_in->sin6_family = AF_INET6;
 170                memcpy(&out_in->sin6_addr.s6_addr, gid->raw, 16);
 171        }
 172}
 173
 174/*
 175 * rdma_get/set_sgid/dgid() APIs are applicable to IB, and iWarp.
 176 * They are not applicable to RoCE.
 177 * RoCE GIDs are derived from the IP addresses.
 178 */
 179static inline void rdma_addr_get_sgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid)
 180{
 181        memcpy(gid, dev_addr->src_dev_addr + rdma_addr_gid_offset(dev_addr),
 182               sizeof(*gid));
 183}
 184
 185static inline void rdma_addr_set_sgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid)
 186{
 187        memcpy(dev_addr->src_dev_addr + rdma_addr_gid_offset(dev_addr), gid, sizeof *gid);
 188}
 189
 190static inline void rdma_addr_get_dgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid)
 191{
 192        memcpy(gid, dev_addr->dst_dev_addr + rdma_addr_gid_offset(dev_addr), sizeof *gid);
 193}
 194
 195static inline void rdma_addr_set_dgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid)
 196{
 197        memcpy(dev_addr->dst_dev_addr + rdma_addr_gid_offset(dev_addr), gid, sizeof *gid);
 198}
 199
 200static inline enum ib_mtu iboe_get_mtu(int mtu)
 201{
 202        /*
 203         * Reduce IB headers from effective IBoE MTU.
 204         */
 205        mtu = mtu - (IB_GRH_BYTES + IB_UDP_BYTES + IB_BTH_BYTES +
 206                     IB_EXT_XRC_BYTES + IB_EXT_ATOMICETH_BYTES +
 207                     IB_ICRC_BYTES);
 208
 209        if (mtu >= ib_mtu_enum_to_int(IB_MTU_4096))
 210                return IB_MTU_4096;
 211        else if (mtu >= ib_mtu_enum_to_int(IB_MTU_2048))
 212                return IB_MTU_2048;
 213        else if (mtu >= ib_mtu_enum_to_int(IB_MTU_1024))
 214                return IB_MTU_1024;
 215        else if (mtu >= ib_mtu_enum_to_int(IB_MTU_512))
 216                return IB_MTU_512;
 217        else if (mtu >= ib_mtu_enum_to_int(IB_MTU_256))
 218                return IB_MTU_256;
 219        else
 220                return 0;
 221}
 222
 223static inline int iboe_get_rate(struct net_device *dev)
 224{
 225        struct ethtool_link_ksettings cmd;
 226        int err;
 227
 228        rtnl_lock();
 229        err = __ethtool_get_link_ksettings(dev, &cmd);
 230        rtnl_unlock();
 231        if (err)
 232                return IB_RATE_PORT_CURRENT;
 233
 234        if (cmd.base.speed >= 40000)
 235                return IB_RATE_40_GBPS;
 236        else if (cmd.base.speed >= 30000)
 237                return IB_RATE_30_GBPS;
 238        else if (cmd.base.speed >= 20000)
 239                return IB_RATE_20_GBPS;
 240        else if (cmd.base.speed >= 10000)
 241                return IB_RATE_10_GBPS;
 242        else
 243                return IB_RATE_PORT_CURRENT;
 244}
 245
 246static inline int rdma_link_local_addr(struct in6_addr *addr)
 247{
 248        if (addr->s6_addr32[0] == htonl(0xfe800000) &&
 249            addr->s6_addr32[1] == 0)
 250                return 1;
 251
 252        return 0;
 253}
 254
 255static inline void rdma_get_ll_mac(struct in6_addr *addr, u8 *mac)
 256{
 257        memcpy(mac, &addr->s6_addr[8], 3);
 258        memcpy(mac + 3, &addr->s6_addr[13], 3);
 259        mac[0] ^= 2;
 260}
 261
 262static inline int rdma_is_multicast_addr(struct in6_addr *addr)
 263{
 264        __be32 ipv4_addr;
 265
 266        if (addr->s6_addr[0] == 0xff)
 267                return 1;
 268
 269        ipv4_addr = addr->s6_addr32[3];
 270        return (ipv6_addr_v4mapped(addr) && ipv4_is_multicast(ipv4_addr));
 271}
 272
 273static inline void rdma_get_mcast_mac(struct in6_addr *addr, u8 *mac)
 274{
 275        int i;
 276
 277        mac[0] = 0x33;
 278        mac[1] = 0x33;
 279        for (i = 2; i < 6; ++i)
 280                mac[i] = addr->s6_addr[i + 10];
 281}
 282
 283static inline u16 rdma_get_vlan_id(union ib_gid *dgid)
 284{
 285        u16 vid;
 286
 287        vid = dgid->raw[11] << 8 | dgid->raw[12];
 288        return vid < 0x1000 ? vid : 0xffff;
 289}
 290
 291static inline struct net_device *rdma_vlan_dev_real_dev(const struct net_device *dev)
 292{
 293        return is_vlan_dev(dev) ? vlan_dev_real_dev(dev) : NULL;
 294}
 295
 296#endif /* IB_ADDR_H */
 297