Root/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
46struct rdma_addr_client {
47    atomic_t refcount;
48    struct completion comp;
49};
50
51/**
52 * rdma_addr_register_client - Register an address client.
53 */
54void 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 */
60void rdma_addr_unregister_client(struct rdma_addr_client *client);
61
62struct 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 */
75int 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 */
93int 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
100void rdma_addr_cancel(struct rdma_dev_addr *addr);
101
102int rdma_copy_addr(struct rdma_dev_addr *dev_addr, struct net_device *dev,
103          const unsigned char *dst_dev_addr);
104
105static 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
111static 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
116static 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
122static 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
128static 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
133static 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
149static 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
155static 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
170static 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
180static 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
185static 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
190static 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
195static 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
217static inline int iboe_get_rate(struct net_device *dev)
218{
219    struct ethtool_cmd cmd;
220
221    if (!dev->ethtool_ops || !dev->ethtool_ops->get_settings ||
222        dev->ethtool_ops->get_settings(dev, &cmd))
223        return IB_RATE_PORT_CURRENT;
224
225    if (cmd.speed >= 40000)
226        return IB_RATE_40_GBPS;
227    else if (cmd.speed >= 30000)
228        return IB_RATE_30_GBPS;
229    else if (cmd.speed >= 20000)
230        return IB_RATE_20_GBPS;
231    else if (cmd.speed >= 10000)
232        return IB_RATE_10_GBPS;
233    else
234        return IB_RATE_PORT_CURRENT;
235}
236
237static inline int rdma_link_local_addr(struct in6_addr *addr)
238{
239    if (addr->s6_addr32[0] == htonl(0xfe800000) &&
240        addr->s6_addr32[1] == 0)
241        return 1;
242
243    return 0;
244}
245
246static inline void rdma_get_ll_mac(struct in6_addr *addr, u8 *mac)
247{
248    memcpy(mac, &addr->s6_addr[8], 3);
249    memcpy(mac + 3, &addr->s6_addr[13], 3);
250    mac[0] ^= 2;
251}
252
253static inline int rdma_is_multicast_addr(struct in6_addr *addr)
254{
255    return addr->s6_addr[0] == 0xff;
256}
257
258static inline void rdma_get_mcast_mac(struct in6_addr *addr, u8 *mac)
259{
260    int i;
261
262    mac[0] = 0x33;
263    mac[1] = 0x33;
264    for (i = 2; i < 6; ++i)
265        mac[i] = addr->s6_addr[i + 10];
266}
267
268static inline u16 rdma_get_vlan_id(union ib_gid *dgid)
269{
270    u16 vid;
271
272    vid = dgid->raw[11] << 8 | dgid->raw[12];
273    return vid < 0x1000 ? vid : 0xffff;
274}
275
276static inline struct net_device *rdma_vlan_dev_real_dev(const struct net_device *dev)
277{
278    return dev->priv_flags & IFF_802_1Q_VLAN ?
279        vlan_dev_real_dev(dev) : 0;
280}
281
282#endif /* IB_ADDR_H */
283

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