include/rdma/ib_addr.h

   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
  46 struct rdma_addr_client {
  47         atomic_t refcount;
  48         struct completion comp;
  49 };
  50
  51 /**
  52  * rdma_addr_register_client - Register an address client.
  53  */
  54 void 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  */
  60 void rdma_addr_unregister_client(struct rdma_addr_client *client);
  61
  62 struct 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  */
  75 int 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  */
  93 int 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
 100 void rdma_addr_cancel(struct rdma_dev_addr *addr);
 101
 102 int rdma_copy_addr(struct rdma_dev_addr *dev_addr, struct net_device *dev,
 103               const unsigned char *dst_dev_addr);
 104
 105 static 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
 111 static 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
 116 static 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
 122 static 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
 128 static 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
 133 static 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
 149 static 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
 155 static 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
 170 static 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
 180 static 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
 185 static 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
 190 static 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
 195 static 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
 217 static 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
 242 static 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
 251 static 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
 258 static inline int rdma_is_multicast_addr(struct in6_addr *addr)
 259 {
 260         return addr->s6_addr[0] == 0xff;
 261 }
 262
 263 static 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
 273 static 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
 281 static 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 */