ib_addr.h revision 241697 
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#include <linux/ethtool.h>
45#include <linux/if_vlan.h>
46
47struct rdma_addr_client {
48	atomic_t refcount;
49	struct completion comp;
50};
51
52/**
53 * rdma_addr_register_client - Register an address client.
54 */
55void rdma_addr_register_client(struct rdma_addr_client *client);
56
57/**
58 * rdma_addr_unregister_client - Deregister an address client.
59 * @client: Client object to deregister.
60 */
61void rdma_addr_unregister_client(struct rdma_addr_client *client);
62
63struct rdma_dev_addr {
64	unsigned char src_dev_addr[MAX_ADDR_LEN];
65	unsigned char dst_dev_addr[MAX_ADDR_LEN];
66	unsigned char broadcast[MAX_ADDR_LEN];
67	unsigned short dev_type;
68	int bound_dev_if;
69	enum rdma_transport_type transport;
70};
71
72/**
73 * rdma_translate_ip - Translate a local IP address to an RDMA hardware
74 *   address.
75 */
76int rdma_translate_ip(struct sockaddr *addr, struct rdma_dev_addr *dev_addr);
77
78/**
79 * rdma_resolve_ip - Resolve source and destination IP addresses to
80 *   RDMA hardware addresses.
81 * @client: Address client associated with request.
82 * @src_addr: An optional source address to use in the resolution.  If a
83 *   source address is not provided, a usable address will be returned via
84 *   the callback.
85 * @dst_addr: The destination address to resolve.
86 * @addr: A reference to a data location that will receive the resolved
87 *   addresses.  The data location must remain valid until the callback has
88 *   been invoked.
89 * @timeout_ms: Amount of time to wait for the address resolution to complete.
90 * @callback: Call invoked once address resolution has completed, timed out,
91 *   or been canceled.  A status of 0 indicates success.
92 * @context: User-specified context associated with the call.
93 */
94int rdma_resolve_ip(struct rdma_addr_client *client,
95		    struct sockaddr *src_addr, struct sockaddr *dst_addr,
96		    struct rdma_dev_addr *addr, int timeout_ms,
97		    void (*callback)(int status, struct sockaddr *src_addr,
98				     struct rdma_dev_addr *addr, void *context),
99		    void *context);
100
101void rdma_addr_cancel(struct rdma_dev_addr *addr);
102
103int rdma_copy_addr(struct rdma_dev_addr *dev_addr, struct net_device *dev,
104	      const unsigned char *dst_dev_addr);
105
106static inline int ip_addr_size(struct sockaddr *addr)
107{
108	return addr->sa_family == AF_INET6 ?
109	       sizeof(struct sockaddr_in6) : sizeof(struct sockaddr_in);
110}
111
112static inline u16 ib_addr_get_pkey(struct rdma_dev_addr *dev_addr)
113{
114	return ((u16)dev_addr->broadcast[8] << 8) | (u16)dev_addr->broadcast[9];
115}
116
117static inline void ib_addr_set_pkey(struct rdma_dev_addr *dev_addr, u16 pkey)
118{
119	dev_addr->broadcast[8] = pkey >> 8;
120	dev_addr->broadcast[9] = (unsigned char) pkey;
121}
122
123static inline void ib_addr_get_mgid(struct rdma_dev_addr *dev_addr,
124				    union ib_gid *gid)
125{
126	memcpy(gid, dev_addr->broadcast + 4, sizeof *gid);
127}
128
129static inline int rdma_addr_gid_offset(struct rdma_dev_addr *dev_addr)
130{
131	return dev_addr->dev_type == ARPHRD_INFINIBAND ? 4 : 0;
132}
133
134static inline void iboe_mac_vlan_to_ll(union ib_gid *gid, u8 *mac, u16 vid)
135{
136	memset(gid->raw, 0, 16);
137	*((u32 *)gid->raw) = cpu_to_be32(0xfe800000);
138	if (vid < 0x1000) {
139		gid->raw[12] = vid & 0xff;
140		gid->raw[11] = vid >> 8;
141	} else {
142		gid->raw[12] = 0xfe;
143		gid->raw[11] = 0xff;
144	}
145
146	memcpy(gid->raw + 13, mac + 3, 3);
147	memcpy(gid->raw + 8, mac, 3);
148	gid->raw[8] ^= 2;
149}
150
151static inline u16 rdma_vlan_dev_vlan_id(const struct net_device *dev)
152{
153#ifdef __linux__
154	return dev->priv_flags & IFF_802_1Q_VLAN ?
155		vlan_dev_vlan_id(dev) : 0xffff;
156#else
157	uint16_t tag;
158
159	if (VLAN_TAG(__DECONST(struct ifnet *, dev), &tag) != 0)
160		return 0xffff;
161	return tag;
162#endif
163}
164
165static inline void iboe_addr_get_sgid(struct rdma_dev_addr *dev_addr,
166				      union ib_gid *gid)
167{
168	struct net_device *dev;
169	u16 vid = 0xffff;
170
171	dev = dev_get_by_index(&init_net, dev_addr->bound_dev_if);
172	if (dev) {
173		vid = rdma_vlan_dev_vlan_id(dev);
174		dev_put(dev);
175	}
176
177	iboe_mac_vlan_to_ll(gid, dev_addr->src_dev_addr, vid);
178}
179
180static inline void rdma_addr_get_sgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid)
181{
182	if (dev_addr->transport == RDMA_TRANSPORT_IB &&
183	    dev_addr->dev_type != ARPHRD_INFINIBAND)
184		iboe_addr_get_sgid(dev_addr, gid);
185	else
186		memcpy(gid, dev_addr->src_dev_addr +
187		       rdma_addr_gid_offset(dev_addr), sizeof *gid);
188}
189
190static inline void rdma_addr_set_sgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid)
191{
192	memcpy(dev_addr->src_dev_addr + rdma_addr_gid_offset(dev_addr), gid, sizeof *gid);
193}
194
195static inline void rdma_addr_get_dgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid)
196{
197	memcpy(gid, dev_addr->dst_dev_addr + rdma_addr_gid_offset(dev_addr), sizeof *gid);
198}
199
200static inline void rdma_addr_set_dgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid)
201{
202	memcpy(dev_addr->dst_dev_addr + rdma_addr_gid_offset(dev_addr), gid, sizeof *gid);
203}
204
205static inline enum ib_mtu iboe_get_mtu(int mtu)
206{
207	/*
208	 * reduce IB headers from effective IBoE MTU. 28 stands for
209	 * atomic header which is the biggest possible header after BTH
210	 */
211	mtu = mtu - IB_GRH_BYTES - IB_BTH_BYTES - 28;
212
213	if (mtu >= ib_mtu_enum_to_int(IB_MTU_4096))
214		return IB_MTU_4096;
215	else if (mtu >= ib_mtu_enum_to_int(IB_MTU_2048))
216		return IB_MTU_2048;
217	else if (mtu >= ib_mtu_enum_to_int(IB_MTU_1024))
218		return IB_MTU_1024;
219	else if (mtu >= ib_mtu_enum_to_int(IB_MTU_512))
220		return IB_MTU_512;
221	else if (mtu >= ib_mtu_enum_to_int(IB_MTU_256))
222		return IB_MTU_256;
223	else
224		return 0;
225}
226
227#ifdef __linux__
228static inline int iboe_get_rate(struct net_device *dev)
229{
230	struct ethtool_cmd cmd;
231
232	if (!dev->ethtool_ops || !dev->ethtool_ops->get_settings ||
233	    dev->ethtool_ops->get_settings(dev, &cmd))
234		return IB_RATE_PORT_CURRENT;
235
236	if (cmd.speed >= 40000)
237		return IB_RATE_40_GBPS;
238	else if (cmd.speed >= 30000)
239		return IB_RATE_30_GBPS;
240	else if (cmd.speed >= 20000)
241		return IB_RATE_20_GBPS;
242	else if (cmd.speed >= 10000)
243		return IB_RATE_10_GBPS;
244	else
245		return IB_RATE_PORT_CURRENT;
246}
247#else
248static inline int iboe_get_rate(struct net_device *dev)
249{
250	uintmax_t baudrate;
251	int exp;
252
253	baudrate = dev->if_baudrate;
254	for (exp = dev->if_baudrate_pf; exp > 0; exp--)
255		baudrate *= 10;
256	if (baudrate >= IF_Gbps(40))
257		return IB_RATE_40_GBPS;
258	else if (baudrate >= IF_Gbps(30))
259		return IB_RATE_30_GBPS;
260	else if (baudrate >= IF_Gbps(20))
261		return IB_RATE_20_GBPS;
262	else if (baudrate >= IF_Gbps(10))
263		return IB_RATE_10_GBPS;
264	else
265		return IB_RATE_PORT_CURRENT;
266}
267#endif
268
269static inline int rdma_link_local_addr(struct in6_addr *addr)
270{
271	if (addr->s6_addr32[0] == cpu_to_be32(0xfe800000) &&
272	    addr->s6_addr32[1] == 0)
273		return 1;
274
275	return 0;
276}
277
278static inline void rdma_get_ll_mac(struct in6_addr *addr, u8 *mac)
279{
280	memcpy(mac, &addr->s6_addr[8], 3);
281	memcpy(mac + 3, &addr->s6_addr[13], 3);
282	mac[0] ^= 2;
283}
284
285static inline int rdma_is_multicast_addr(struct in6_addr *addr)
286{
287	return addr->s6_addr[0] == 0xff;
288}
289
290static inline void rdma_get_mcast_mac(struct in6_addr *addr, u8 *mac)
291{
292	int i;
293
294	mac[0] = 0x33;
295	mac[1] = 0x33;
296	for (i = 2; i < 6; ++i)
297		mac[i] = addr->s6_addr[i + 10];
298}
299
300static inline u16 rdma_get_vlan_id(union ib_gid *dgid)
301{
302	u16 vid;
303
304	vid = dgid->raw[11] << 8 | dgid->raw[12];
305	return vid < 0x1000 ? vid  : 0xffff;
306}
307
308static inline struct net_device *rdma_vlan_dev_real_dev(const struct net_device *dev)
309{
310#ifdef __linux__
311	return dev->priv_flags & IFF_802_1Q_VLAN ?
312		vlan_dev_real_dev(dev) : 0;
313#else
314	return VLAN_TRUNKDEV(__DECONST(struct ifnet *, dev));
315#endif
316}
317
318#endif /* IB_ADDR_H */
319