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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/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  */
 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         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  */
 81 int 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  */
101 int 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 
107 void rdma_addr_cancel(struct rdma_dev_addr *addr);
108 
109 int rdma_addr_size(const struct sockaddr *addr);
110 int rdma_addr_size_in6(struct sockaddr_in6 *addr);
111 int rdma_addr_size_kss(struct __kernel_sockaddr_storage *addr);
112 
113 static 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 
118 static 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 
124 static 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 
130 static 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 
135 static 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 
140 static 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 */
159 static 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  */
179 static 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 
185 static 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 
190 static 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 
195 static 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 
200 static 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 
223 static 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 
246 static 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 
255 static 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 
262 static 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 
273 static 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 
283 static 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 
291 static 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 

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