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TOMOYO Linux Cross Reference
Linux/include/rdma/ib_addr.h

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  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         enum rdma_network_type network;
 87         int hoplimit;
 88 };
 89 
 90 /**
 91  * rdma_translate_ip - Translate a local IP address to an RDMA hardware
 92  *   address.
 93  *
 94  * The dev_addr->net field must be initialized.
 95  */
 96 int rdma_translate_ip(const struct sockaddr *addr,
 97                       struct rdma_dev_addr *dev_addr, u16 *vlan_id);
 98 
 99 /**
100  * rdma_resolve_ip - Resolve source and destination IP addresses to
101  *   RDMA hardware addresses.
102  * @client: Address client associated with request.
103  * @src_addr: An optional source address to use in the resolution.  If a
104  *   source address is not provided, a usable address will be returned via
105  *   the callback.
106  * @dst_addr: The destination address to resolve.
107  * @addr: A reference to a data location that will receive the resolved
108  *   addresses.  The data location must remain valid until the callback has
109  *   been invoked. The net field of the addr struct must be valid.
110  * @timeout_ms: Amount of time to wait for the address resolution to complete.
111  * @callback: Call invoked once address resolution has completed, timed out,
112  *   or been canceled.  A status of 0 indicates success.
113  * @context: User-specified context associated with the call.
114  */
115 int rdma_resolve_ip(struct rdma_addr_client *client,
116                     struct sockaddr *src_addr, struct sockaddr *dst_addr,
117                     struct rdma_dev_addr *addr, int timeout_ms,
118                     void (*callback)(int status, struct sockaddr *src_addr,
119                                      struct rdma_dev_addr *addr, void *context),
120                     void *context);
121 
122 int rdma_resolve_ip_route(struct sockaddr *src_addr,
123                           const struct sockaddr *dst_addr,
124                           struct rdma_dev_addr *addr);
125 
126 void rdma_addr_cancel(struct rdma_dev_addr *addr);
127 
128 void rdma_copy_addr(struct rdma_dev_addr *dev_addr,
129                     const struct net_device *dev,
130                     const unsigned char *dst_dev_addr);
131 
132 int rdma_addr_size(struct sockaddr *addr);
133 int rdma_addr_size_in6(struct sockaddr_in6 *addr);
134 int rdma_addr_size_kss(struct __kernel_sockaddr_storage *addr);
135 
136 int rdma_addr_find_smac_by_sgid(union ib_gid *sgid, u8 *smac, u16 *vlan_id);
137 int rdma_addr_find_l2_eth_by_grh(const union ib_gid *sgid,
138                                  const union ib_gid *dgid,
139                                  u8 *smac, u16 *vlan_id, int *if_index,
140                                  int *hoplimit);
141 
142 static inline u16 ib_addr_get_pkey(struct rdma_dev_addr *dev_addr)
143 {
144         return ((u16)dev_addr->broadcast[8] << 8) | (u16)dev_addr->broadcast[9];
145 }
146 
147 static inline void ib_addr_set_pkey(struct rdma_dev_addr *dev_addr, u16 pkey)
148 {
149         dev_addr->broadcast[8] = pkey >> 8;
150         dev_addr->broadcast[9] = (unsigned char) pkey;
151 }
152 
153 static inline void ib_addr_get_mgid(struct rdma_dev_addr *dev_addr,
154                                     union ib_gid *gid)
155 {
156         memcpy(gid, dev_addr->broadcast + 4, sizeof *gid);
157 }
158 
159 static inline int rdma_addr_gid_offset(struct rdma_dev_addr *dev_addr)
160 {
161         return dev_addr->dev_type == ARPHRD_INFINIBAND ? 4 : 0;
162 }
163 
164 static inline u16 rdma_vlan_dev_vlan_id(const struct net_device *dev)
165 {
166         return is_vlan_dev(dev) ? vlan_dev_vlan_id(dev) : 0xffff;
167 }
168 
169 static inline int rdma_ip2gid(struct sockaddr *addr, union ib_gid *gid)
170 {
171         switch (addr->sa_family) {
172         case AF_INET:
173                 ipv6_addr_set_v4mapped(((struct sockaddr_in *)
174                                         addr)->sin_addr.s_addr,
175                                        (struct in6_addr *)gid);
176                 break;
177         case AF_INET6:
178                 *(struct in6_addr *)&gid->raw =
179                         ((struct sockaddr_in6 *)addr)->sin6_addr;
180                 break;
181         default:
182                 return -EINVAL;
183         }
184         return 0;
185 }
186 
187 /* Important - sockaddr should be a union of sockaddr_in and sockaddr_in6 */
188 static inline void rdma_gid2ip(struct sockaddr *out, const union ib_gid *gid)
189 {
190         if (ipv6_addr_v4mapped((struct in6_addr *)gid)) {
191                 struct sockaddr_in *out_in = (struct sockaddr_in *)out;
192                 memset(out_in, 0, sizeof(*out_in));
193                 out_in->sin_family = AF_INET;
194                 memcpy(&out_in->sin_addr.s_addr, gid->raw + 12, 4);
195         } else {
196                 struct sockaddr_in6 *out_in = (struct sockaddr_in6 *)out;
197                 memset(out_in, 0, sizeof(*out_in));
198                 out_in->sin6_family = AF_INET6;
199                 memcpy(&out_in->sin6_addr.s6_addr, gid->raw, 16);
200         }
201 }
202 
203 static inline void iboe_addr_get_sgid(struct rdma_dev_addr *dev_addr,
204                                       union ib_gid *gid)
205 {
206         struct net_device *dev;
207         struct in_device *ip4;
208 
209         dev = dev_get_by_index(&init_net, dev_addr->bound_dev_if);
210         if (dev) {
211                 ip4 = in_dev_get(dev);
212                 if (ip4 && ip4->ifa_list && ip4->ifa_list->ifa_address)
213                         ipv6_addr_set_v4mapped(ip4->ifa_list->ifa_address,
214                                                (struct in6_addr *)gid);
215 
216                 if (ip4)
217                         in_dev_put(ip4);
218 
219                 dev_put(dev);
220         }
221 }
222 
223 static inline void rdma_addr_get_sgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid)
224 {
225         if (dev_addr->transport == RDMA_TRANSPORT_IB &&
226             dev_addr->dev_type != ARPHRD_INFINIBAND)
227                 iboe_addr_get_sgid(dev_addr, gid);
228         else
229                 memcpy(gid, dev_addr->src_dev_addr +
230                        rdma_addr_gid_offset(dev_addr), sizeof *gid);
231 }
232 
233 static inline void rdma_addr_set_sgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid)
234 {
235         memcpy(dev_addr->src_dev_addr + rdma_addr_gid_offset(dev_addr), gid, sizeof *gid);
236 }
237 
238 static inline void rdma_addr_get_dgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid)
239 {
240         memcpy(gid, dev_addr->dst_dev_addr + rdma_addr_gid_offset(dev_addr), sizeof *gid);
241 }
242 
243 static inline void rdma_addr_set_dgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid)
244 {
245         memcpy(dev_addr->dst_dev_addr + rdma_addr_gid_offset(dev_addr), gid, sizeof *gid);
246 }
247 
248 static inline enum ib_mtu iboe_get_mtu(int mtu)
249 {
250         /*
251          * Reduce IB headers from effective IBoE MTU.
252          */
253         mtu = mtu - (IB_GRH_BYTES + IB_UDP_BYTES + IB_BTH_BYTES +
254                      IB_EXT_XRC_BYTES + IB_EXT_ATOMICETH_BYTES +
255                      IB_ICRC_BYTES);
256 
257         if (mtu >= ib_mtu_enum_to_int(IB_MTU_4096))
258                 return IB_MTU_4096;
259         else if (mtu >= ib_mtu_enum_to_int(IB_MTU_2048))
260                 return IB_MTU_2048;
261         else if (mtu >= ib_mtu_enum_to_int(IB_MTU_1024))
262                 return IB_MTU_1024;
263         else if (mtu >= ib_mtu_enum_to_int(IB_MTU_512))
264                 return IB_MTU_512;
265         else if (mtu >= ib_mtu_enum_to_int(IB_MTU_256))
266                 return IB_MTU_256;
267         else
268                 return 0;
269 }
270 
271 static inline int iboe_get_rate(struct net_device *dev)
272 {
273         struct ethtool_link_ksettings cmd;
274         int err;
275 
276         rtnl_lock();
277         err = __ethtool_get_link_ksettings(dev, &cmd);
278         rtnl_unlock();
279         if (err)
280                 return IB_RATE_PORT_CURRENT;
281 
282         if (cmd.base.speed >= 40000)
283                 return IB_RATE_40_GBPS;
284         else if (cmd.base.speed >= 30000)
285                 return IB_RATE_30_GBPS;
286         else if (cmd.base.speed >= 20000)
287                 return IB_RATE_20_GBPS;
288         else if (cmd.base.speed >= 10000)
289                 return IB_RATE_10_GBPS;
290         else
291                 return IB_RATE_PORT_CURRENT;
292 }
293 
294 static inline int rdma_link_local_addr(struct in6_addr *addr)
295 {
296         if (addr->s6_addr32[0] == htonl(0xfe800000) &&
297             addr->s6_addr32[1] == 0)
298                 return 1;
299 
300         return 0;
301 }
302 
303 static inline void rdma_get_ll_mac(struct in6_addr *addr, u8 *mac)
304 {
305         memcpy(mac, &addr->s6_addr[8], 3);
306         memcpy(mac + 3, &addr->s6_addr[13], 3);
307         mac[0] ^= 2;
308 }
309 
310 static inline int rdma_is_multicast_addr(struct in6_addr *addr)
311 {
312         __be32 ipv4_addr;
313 
314         if (addr->s6_addr[0] == 0xff)
315                 return 1;
316 
317         ipv4_addr = addr->s6_addr32[3];
318         return (ipv6_addr_v4mapped(addr) && ipv4_is_multicast(ipv4_addr));
319 }
320 
321 static inline void rdma_get_mcast_mac(struct in6_addr *addr, u8 *mac)
322 {
323         int i;
324 
325         mac[0] = 0x33;
326         mac[1] = 0x33;
327         for (i = 2; i < 6; ++i)
328                 mac[i] = addr->s6_addr[i + 10];
329 }
330 
331 static inline u16 rdma_get_vlan_id(union ib_gid *dgid)
332 {
333         u16 vid;
334 
335         vid = dgid->raw[11] << 8 | dgid->raw[12];
336         return vid < 0x1000 ? vid : 0xffff;
337 }
338 
339 static inline struct net_device *rdma_vlan_dev_real_dev(const struct net_device *dev)
340 {
341         return is_vlan_dev(dev) ? vlan_dev_real_dev(dev) : NULL;
342 }
343 
344 #endif /* IB_ADDR_H */
345 

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