aboutsummaryrefslogtreecommitdiffstats
path: root/net/tipc/ib_media.c
blob: ad2e1ec4117e316de8a497ab7e83a7b4fe6a8eb8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
/*
 * net/tipc/ib_media.c: Infiniband bearer support for TIPC
 *
 * Copyright (c) 2013 Patrick McHardy <kaber@trash.net>
 *
 * Based on eth_media.c, which carries the following copyright notice:
 *
 * Copyright (c) 2001-2007, Ericsson AB
 * Copyright (c) 2005-2008, 2011, Wind River Systems
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the names of the copyright holders nor the names of its
 *    contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <linux/if_infiniband.h>
#include "core.h"
#include "bearer.h"

#define MAX_IB_BEARERS		MAX_BEARERS

/**
 * struct ib_bearer - Infiniband bearer data structure
 * @bearer: ptr to associated "generic" bearer structure
 * @dev: ptr to associated Infiniband network device
 * @tipc_packet_type: used in binding TIPC to Infiniband driver
 * @cleanup: work item used when disabling bearer
 */

struct ib_bearer {
	struct tipc_bearer *bearer;
	struct net_device *dev;
	struct packet_type tipc_packet_type;
	struct work_struct setup;
	struct work_struct cleanup;
};

static struct tipc_media ib_media_info;
static struct ib_bearer ib_bearers[MAX_IB_BEARERS];
static int ib_started;

/**
 * ib_media_addr_set - initialize Infiniband media address structure
 *
 * Media-dependent "value" field stores MAC address in first 6 bytes
 * and zeroes out the remaining bytes.
 */
static void ib_media_addr_set(const struct tipc_bearer *tb_ptr,
			      struct tipc_media_addr *a, char *mac)
{
	BUILD_BUG_ON(sizeof(a->value) < INFINIBAND_ALEN);
	memcpy(a->value, mac, INFINIBAND_ALEN);
	a->media_id = TIPC_MEDIA_TYPE_IB;
	a->broadcast = !memcmp(mac, tb_ptr->bcast_addr.value, INFINIBAND_ALEN);
}

/**
 * send_msg - send a TIPC message out over an InfiniBand interface
 */
static int send_msg(struct sk_buff *buf, struct tipc_bearer *tb_ptr,
		    struct tipc_media_addr *dest)
{
	struct sk_buff *clone;
	struct net_device *dev;
	int delta;

	clone = skb_clone(buf, GFP_ATOMIC);
	if (!clone)
		return 0;

	dev = ((struct ib_bearer *)(tb_ptr->usr_handle))->dev;
	delta = dev->hard_header_len - skb_headroom(buf);

	if ((delta > 0) &&
	    pskb_expand_head(clone, SKB_DATA_ALIGN(delta), 0, GFP_ATOMIC)) {
		kfree_skb(clone);
		return 0;
	}

	skb_reset_network_header(clone);
	clone->dev = dev;
	clone->protocol = htons(ETH_P_TIPC);
	dev_hard_header(clone, dev, ETH_P_TIPC, dest->value,
			dev->dev_addr, clone->len);
	dev_queue_xmit(clone);
	return 0;
}

/**
 * recv_msg - handle incoming TIPC message from an InfiniBand interface
 *
 * Accept only packets explicitly sent to this node, or broadcast packets;
 * ignores packets sent using InfiniBand multicast, and traffic sent to other
 * nodes (which can happen if interface is running in promiscuous mode).
 */
static int recv_msg(struct sk_buff *buf, struct net_device *dev,
		    struct packet_type *pt, struct net_device *orig_dev)
{
	struct ib_bearer *ib_ptr = (struct ib_bearer *)pt->af_packet_priv;

	if (!net_eq(dev_net(dev), &init_net)) {
		kfree_skb(buf);
		return 0;
	}

	if (likely(ib_ptr->bearer)) {
		if (likely(buf->pkt_type <= PACKET_BROADCAST)) {
			buf->next = NULL;
			tipc_recv_msg(buf, ib_ptr->bearer);
			return 0;
		}
	}
	kfree_skb(buf);
	return 0;
}

/**
 * setup_bearer - setup association between InfiniBand bearer and interface
 */
static void setup_bearer(struct work_struct *work)
{
	struct ib_bearer *ib_ptr =
		container_of(work, struct ib_bearer, setup);

	dev_add_pack(&ib_ptr->tipc_packet_type);
}

/**
 * enable_bearer - attach TIPC bearer to an InfiniBand interface
 */
static int enable_bearer(struct tipc_bearer *tb_ptr)
{
	struct net_device *dev;
	struct ib_bearer *ib_ptr = &ib_bearers[0];
	struct ib_bearer *stop = &ib_bearers[MAX_IB_BEARERS];
	char *driver_name = strchr((const char *)tb_ptr->name, ':') + 1;
	int pending_dev = 0;

	/* Find unused InfiniBand bearer structure */
	while (ib_ptr->dev) {
		if (!ib_ptr->bearer)
			pending_dev++;
		if (++ib_ptr == stop)
			return pending_dev ? -EAGAIN : -EDQUOT;
	}

	/* Find device with specified name */
	dev = dev_get_by_name(&init_net, driver_name);
	if (!dev)
		return -ENODEV;

	/* Create InfiniBand bearer for device */
	ib_ptr->dev = dev;
	ib_ptr->tipc_packet_type.type = htons(ETH_P_TIPC);
	ib_ptr->tipc_packet_type.dev = dev;
	ib_ptr->tipc_packet_type.func = recv_msg;
	ib_ptr->tipc_packet_type.af_packet_priv = ib_ptr;
	INIT_LIST_HEAD(&(ib_ptr->tipc_packet_type.list));
	INIT_WORK(&ib_ptr->setup, setup_bearer);
	schedule_work(&ib_ptr->setup);

	/* Associate TIPC bearer with InfiniBand bearer */
	ib_ptr->bearer = tb_ptr;
	tb_ptr->usr_handle = (void *)ib_ptr;
	memset(tb_ptr->bcast_addr.value, 0, sizeof(tb_ptr->bcast_addr.value));
	memcpy(tb_ptr->bcast_addr.value, dev->broadcast, INFINIBAND_ALEN);
	tb_ptr->bcast_addr.media_id = TIPC_MEDIA_TYPE_IB;
	tb_ptr->bcast_addr.broadcast = 1;
	tb_ptr->mtu = dev->mtu;
	tb_ptr->blocked = 0;
	ib_media_addr_set(tb_ptr, &tb_ptr->addr, (char *)dev->dev_addr);
	return 0;
}

/**
 * cleanup_bearer - break association between InfiniBand bearer and interface
 *
 * This routine must be invoked from a work queue because it can sleep.
 */
static void cleanup_bearer(struct work_struct *work)
{
	struct ib_bearer *ib_ptr =
		container_of(work, struct ib_bearer, cleanup);

	dev_remove_pack(&ib_ptr->tipc_packet_type);
	dev_put(ib_ptr->dev);
	ib_ptr->dev = NULL;
}

/**
 * disable_bearer - detach TIPC bearer from an InfiniBand interface
 *
 * Mark InfiniBand bearer as inactive so that incoming buffers are thrown away,
 * then get worker thread to complete bearer cleanup.  (Can't do cleanup
 * here because cleanup code needs to sleep and caller holds spinlocks.)
 */
static void disable_bearer(struct tipc_bearer *tb_ptr)
{
	struct ib_bearer *ib_ptr = (struct ib_bearer *)tb_ptr->usr_handle;

	ib_ptr->bearer = NULL;
	INIT_WORK(&ib_ptr->cleanup, cleanup_bearer);
	schedule_work(&ib_ptr->cleanup);
}

/**
 * recv_notification - handle device updates from OS
 *
 * Change the state of the InfiniBand bearer (if any) associated with the
 * specified device.
 */
static int recv_notification(struct notifier_block *nb, unsigned long evt,
			     void *ptr)
{
	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
	struct ib_bearer *ib_ptr = &ib_bearers[0];
	struct ib_bearer *stop = &ib_bearers[MAX_IB_BEARERS];

	if (!net_eq(dev_net(dev), &init_net))
		return NOTIFY_DONE;

	while ((ib_ptr->dev != dev)) {
		if (++ib_ptr == stop)
			return NOTIFY_DONE;	/* couldn't find device */
	}
	if (!ib_ptr->bearer)
		return NOTIFY_DONE;		/* bearer had been disabled */

	ib_ptr->bearer->mtu = dev->mtu;

	switch (evt) {
	case NETDEV_CHANGE:
		if (netif_carrier_ok(dev))
			tipc_continue(ib_ptr->bearer);
		else
			tipc_block_bearer(ib_ptr->bearer->name);
		break;
	case NETDEV_UP:
		tipc_continue(ib_ptr->bearer);
		break;
	case NETDEV_DOWN:
		tipc_block_bearer(ib_ptr->bearer->name);
		break;
	case NETDEV_CHANGEMTU:
	case NETDEV_CHANGEADDR:
		tipc_block_bearer(ib_ptr->bearer->name);
		tipc_continue(ib_ptr->bearer);
		break;
	case NETDEV_UNREGISTER:
	case NETDEV_CHANGENAME:
		tipc_disable_bearer(ib_ptr->bearer->name);
		break;
	}
	return NOTIFY_OK;
}

static struct notifier_block notifier = {
	.notifier_call	= recv_notification,
	.priority	= 0,
};

/**
 * ib_addr2str - convert InfiniBand address to string
 */
static int ib_addr2str(struct tipc_media_addr *a, char *str_buf, int str_size)
{
	if (str_size < 60)	/* 60 = 19 * strlen("xx:") + strlen("xx\0") */
		return 1;

	sprintf(str_buf, "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:"
			 "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x",
		a->value[0], a->value[1], a->value[2], a->value[3],
		a->value[4], a->value[5], a->value[6], a->value[7],
		a->value[8], a->value[9], a->value[10], a->value[11],
		a->value[12], a->value[13], a->value[14], a->value[15],
		a->value[16], a->value[17], a->value[18], a->value[19]);

	return 0;
}

/**
 * ib_addr2msg - convert InfiniBand address format to message header format
 */
static int ib_addr2msg(struct tipc_media_addr *a, char *msg_area)
{
	memset(msg_area, 0, TIPC_MEDIA_ADDR_SIZE);
	msg_area[TIPC_MEDIA_TYPE_OFFSET] = TIPC_MEDIA_TYPE_IB;
	memcpy(msg_area, a->value, INFINIBAND_ALEN);
	return 0;
}

/**
 * ib_msg2addr - convert message header address format to InfiniBand format
 */
static int ib_msg2addr(const struct tipc_bearer *tb_ptr,
		       struct tipc_media_addr *a, char *msg_area)
{
	ib_media_addr_set(tb_ptr, a, msg_area);
	return 0;
}

/*
 * InfiniBand media registration info
 */
static struct tipc_media ib_media_info = {
	.send_msg	= send_msg,
	.enable_bearer	= enable_bearer,
	.disable_bearer	= disable_bearer,
	.addr2str	= ib_addr2str,
	.addr2msg	= ib_addr2msg,
	.msg2addr	= ib_msg2addr,
	.priority	= TIPC_DEF_LINK_PRI,
	.tolerance	= TIPC_DEF_LINK_TOL,
	.window		= TIPC_DEF_LINK_WIN,
	.type_id	= TIPC_MEDIA_TYPE_IB,
	.name		= "ib"
};

/**
 * tipc_ib_media_start - activate InfiniBand bearer support
 *
 * Register InfiniBand media type with TIPC bearer code.  Also register
 * with OS for notifications about device state changes.
 */
int tipc_ib_media_start(void)
{
	int res;

	if (ib_started)
		return -EINVAL;

	res = tipc_register_media(&ib_media_info);
	if (res)
		return res;

	res = register_netdevice_notifier(&notifier);
	if (!res)
		ib_started = 1;
	return res;
}

/**
 * tipc_ib_media_stop - deactivate InfiniBand bearer support
 */
void tipc_ib_media_stop(void)
{
	if (!ib_started)
		return;

	flush_scheduled_work();
	unregister_netdevice_notifier(&notifier);
	ib_started = 0;
}

Privacy Policy