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/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
  52 struct rdma_addr_client {
  53         atomic_t refcount;
  54         struct completion comp;
  55 };
  56
  57 /**
  58  * rdma_addr_register_client - Register an address client.
  59  */
  60 void 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  */
  66 void 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  */
  78 struct 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  */
  94 int 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  */
 113 int 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
 120 void rdma_addr_cancel(struct rdma_dev_addr *addr);
 121
 122 int rdma_copy_addr(struct rdma_dev_addr *dev_addr, struct net_device *dev,
 123               const unsigned char *dst_dev_addr);
 124
 125 int rdma_addr_size(struct sockaddr *addr);
 126
 127 int rdma_addr_find_smac_by_sgid(union ib_gid *sgid, u8 *smac, u16 *vlan_id);
 128 int 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
 131 static 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
 136 static 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
 142 static 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
 148 static 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
 153 static 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
 159 static 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 */
 177 static 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
 192 static 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
 208 static 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
 218 static 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
 223 static 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
 228 static 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
 233 static 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
 255 static 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
 280 static 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
 289 static 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
 296 static inline int rdma_is_multicast_addr(struct in6_addr *addr)
 297 {
 298         return addr->s6_addr[0] == 0xff;
 299 }
 300
 301 static 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
 311 static 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
 319 static 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 */