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