[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / tipc / ib_media.c

/*
 * 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 = NULL;
	struct net_device *pdev = NULL;
	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 */
	read_lock(&dev_base_lock);
	for_each_netdev(&init_net, pdev) {
		if (!strncmp(pdev->name, driver_name, IFNAMSIZ)) {
			dev = pdev;
			dev_hold(dev);
			break;
		}
	}
	read_unlock(&dev_base_lock);
	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 *dv)
{
	struct net_device *dev = (struct net_device *)dv;
	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;
}
Commit	Line	Data
a29a194a PM	1	/*
	2	* net/tipc/ib_media.c: Infiniband bearer support for TIPC
	3	*
	4	* Copyright (c) 2013 Patrick McHardy <kaber@trash.net>
	5	*
	6	* Based on eth_media.c, which carries the following copyright notice:
	7	*
	8	* Copyright (c) 2001-2007, Ericsson AB
	9	* Copyright (c) 2005-2008, 2011, Wind River Systems
	10	* All rights reserved.
	11	*
	12	* Redistribution and use in source and binary forms, with or without
	13	* modification, are permitted provided that the following conditions are met:
	14	*
	15	* 1. Redistributions of source code must retain the above copyright
	16	* notice, this list of conditions and the following disclaimer.
	17	* 2. Redistributions in binary form must reproduce the above copyright
	18	* notice, this list of conditions and the following disclaimer in the
	19	* documentation and/or other materials provided with the distribution.
	20	* 3. Neither the names of the copyright holders nor the names of its
	21	* contributors may be used to endorse or promote products derived from
	22	* this software without specific prior written permission.
	23	*
	24	* Alternatively, this software may be distributed under the terms of the
	25	* GNU General Public License ("GPL") version 2 as published by the Free
	26	* Software Foundation.
	27	*
	28	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
	29	* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	30	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	31	* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
	32	* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	33	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	34	* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
	35	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
	36	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	37	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
	38	* POSSIBILITY OF SUCH DAMAGE.
	39	*/
	40
	41	#include <linux/if_infiniband.h>
	42	#include "core.h"
	43	#include "bearer.h"
	44
	45	#define MAX_IB_BEARERS MAX_BEARERS
	46
	47	/**
	48	* struct ib_bearer - Infiniband bearer data structure
	49	* @bearer: ptr to associated "generic" bearer structure
	50	* @dev: ptr to associated Infiniband network device
	51	* @tipc_packet_type: used in binding TIPC to Infiniband driver
	52	* @cleanup: work item used when disabling bearer
	53	*/
	54
	55	struct ib_bearer {
	56	struct tipc_bearer *bearer;
	57	struct net_device *dev;
	58	struct packet_type tipc_packet_type;
	59	struct work_struct setup;
	60	struct work_struct cleanup;
	61	};
	62
	63	static struct tipc_media ib_media_info;
	64	static struct ib_bearer ib_bearers[MAX_IB_BEARERS];
65	static int ib_started;
66
67	/**
68	* ib_media_addr_set - initialize Infiniband media address structure
69	*
70	* Media-dependent "value" field stores MAC address in first 6 bytes
71	* and zeroes out the remaining bytes.
72	*/
73	static void ib_media_addr_set(const struct tipc_bearer *tb_ptr,
74	struct tipc_media_addr a, char mac)
75	{
76	BUILD_BUG_ON(sizeof(a->value) < INFINIBAND_ALEN);
77	memcpy(a->value, mac, INFINIBAND_ALEN);
78	a->media_id = TIPC_MEDIA_TYPE_IB;
79	a->broadcast = !memcmp(mac, tb_ptr->bcast_addr.value, INFINIBAND_ALEN);
80	}
81
82	/**
83	* send_msg - send a TIPC message out over an InfiniBand interface
84	*/
85	static int send_msg(struct sk_buff buf, struct tipc_bearer tb_ptr,
86	struct tipc_media_addr *dest)
87	{
88	struct sk_buff *clone;
89	struct net_device *dev;
90	int delta;
91
92	clone = skb_clone(buf, GFP_ATOMIC);
93	if (!clone)
94	return 0;
95
96	dev = ((struct ib_bearer *)(tb_ptr->usr_handle))->dev;
97	delta = dev->hard_header_len - skb_headroom(buf);
98
99	if ((delta > 0) &&
100	pskb_expand_head(clone, SKB_DATA_ALIGN(delta), 0, GFP_ATOMIC)) {
101	kfree_skb(clone);
102	return 0;
103	}
104
105	skb_reset_network_header(clone);
106	clone->dev = dev;
107	clone->protocol = htons(ETH_P_TIPC);
108	dev_hard_header(clone, dev, ETH_P_TIPC, dest->value,
109	dev->dev_addr, clone->len);
110	dev_queue_xmit(clone);
111	return 0;
112	}
113
114	/**
115	* recv_msg - handle incoming TIPC message from an InfiniBand interface
116	*
117	* Accept only packets explicitly sent to this node, or broadcast packets;
118	* ignores packets sent using InfiniBand multicast, and traffic sent to other
119	* nodes (which can happen if interface is running in promiscuous mode).
120	*/
121	static int recv_msg(struct sk_buff buf, struct net_device dev,
122	struct packet_type pt, struct net_device orig_dev)
123	{
124	struct ib_bearer ib_ptr = (struct ib_bearer )pt->af_packet_priv;
125
126	if (!net_eq(dev_net(dev), &init_net)) {
127	kfree_skb(buf);
128	return 0;
129	}
130
131	if (likely(ib_ptr->bearer)) {
132	if (likely(buf->pkt_type <= PACKET_BROADCAST)) {
133	buf->next = NULL;
134	tipc_recv_msg(buf, ib_ptr->bearer);
135	return 0;
136	}
137	}
138	kfree_skb(buf);
139	return 0;
140	}
141
142	/**
143	* setup_bearer - setup association between InfiniBand bearer and interface
144	*/
145	static void setup_bearer(struct work_struct *work)
146	{
147	struct ib_bearer *ib_ptr =
148	container_of(work, struct ib_bearer, setup);
149
150	dev_add_pack(&ib_ptr->tipc_packet_type);
151	}
152
153	/**
154	* enable_bearer - attach TIPC bearer to an InfiniBand interface
155	*/
156	static int enable_bearer(struct tipc_bearer *tb_ptr)
157	{
158	struct net_device *dev = NULL;
159	struct net_device *pdev = NULL;
160	struct ib_bearer *ib_ptr = &ib_bearers[0];
161	struct ib_bearer *stop = &ib_bearers[MAX_IB_BEARERS];
162	char driver_name = strchr((const char )tb_ptr->name, ':') + 1;
163	int pending_dev = 0;
164
165	/* Find unused InfiniBand bearer structure */
166	while (ib_ptr->dev) {
167	if (!ib_ptr->bearer)
168	pending_dev++;
169	if (++ib_ptr == stop)
170	return pending_dev ? -EAGAIN : -EDQUOT;
171	}
172
173	/* Find device with specified name */
174	read_lock(&dev_base_lock);
175	for_each_netdev(&init_net, pdev) {
176	if (!strncmp(pdev->name, driver_name, IFNAMSIZ)) {
177	dev = pdev;
178	dev_hold(dev);
179	break;
180	}
181	}
182	read_unlock(&dev_base_lock);
183	if (!dev)
184	return -ENODEV;
185
186	/* Create InfiniBand bearer for device */
187	ib_ptr->dev = dev;
188	ib_ptr->tipc_packet_type.type = htons(ETH_P_TIPC);
189	ib_ptr->tipc_packet_type.dev = dev;
190	ib_ptr->tipc_packet_type.func = recv_msg;
191	ib_ptr->tipc_packet_type.af_packet_priv = ib_ptr;
192	INIT_LIST_HEAD(&(ib_ptr->tipc_packet_type.list));
193	INIT_WORK(&ib_ptr->setup, setup_bearer);
194	schedule_work(&ib_ptr->setup);
195
196	/* Associate TIPC bearer with InfiniBand bearer */
197	ib_ptr->bearer = tb_ptr;
198	tb_ptr->usr_handle = (void *)ib_ptr;
199	memset(tb_ptr->bcast_addr.value, 0, sizeof(tb_ptr->bcast_addr.value));
200	memcpy(tb_ptr->bcast_addr.value, dev->broadcast, INFINIBAND_ALEN);
201	tb_ptr->bcast_addr.media_id = TIPC_MEDIA_TYPE_IB;
202	tb_ptr->bcast_addr.broadcast = 1;
203	tb_ptr->mtu = dev->mtu;
204	tb_ptr->blocked = 0;
205	ib_media_addr_set(tb_ptr, &tb_ptr->addr, (char *)dev->dev_addr);
206	return 0;
207	}
208
209	/**
210	* cleanup_bearer - break association between InfiniBand bearer and interface
211	*
212	* This routine must be invoked from a work queue because it can sleep.
213	*/
214	static void cleanup_bearer(struct work_struct *work)
215	{
216	struct ib_bearer *ib_ptr =
217	container_of(work, struct ib_bearer, cleanup);
218
219	dev_remove_pack(&ib_ptr->tipc_packet_type);
220	dev_put(ib_ptr->dev);
221	ib_ptr->dev = NULL;
222	}
223
224	/**
225	* disable_bearer - detach TIPC bearer from an InfiniBand interface
226	*
227	* Mark InfiniBand bearer as inactive so that incoming buffers are thrown away,
228	* then get worker thread to complete bearer cleanup. (Can't do cleanup
229	* here because cleanup code needs to sleep and caller holds spinlocks.)
230	*/
231	static void disable_bearer(struct tipc_bearer *tb_ptr)
232	{
233	struct ib_bearer ib_ptr = (struct ib_bearer )tb_ptr->usr_handle;
234
235	ib_ptr->bearer = NULL;
236	INIT_WORK(&ib_ptr->cleanup, cleanup_bearer);
237	schedule_work(&ib_ptr->cleanup);
238	}
239
240	/**
241	* recv_notification - handle device updates from OS
242	*
243	* Change the state of the InfiniBand bearer (if any) associated with the
244	* specified device.
245	*/
246	static int recv_notification(struct notifier_block *nb, unsigned long evt,
247	void *dv)
248	{
249	struct net_device dev = (struct net_device )dv;
250	struct ib_bearer *ib_ptr = &ib_bearers[0];
251	struct ib_bearer *stop = &ib_bearers[MAX_IB_BEARERS];
252
253	if (!net_eq(dev_net(dev), &init_net))
254	return NOTIFY_DONE;
255
256	while ((ib_ptr->dev != dev)) {
257	if (++ib_ptr == stop)
258	return NOTIFY_DONE; /* couldn't find device */
259	}
260	if (!ib_ptr->bearer)
261	return NOTIFY_DONE; /* bearer had been disabled */
262
263	ib_ptr->bearer->mtu = dev->mtu;
264
265	switch (evt) {
266	case NETDEV_CHANGE:
267	if (netif_carrier_ok(dev))
268	tipc_continue(ib_ptr->bearer);
269	else
270	tipc_block_bearer(ib_ptr->bearer->name);
271	break;
272	case NETDEV_UP:
273	tipc_continue(ib_ptr->bearer);
274	break;
275	case NETDEV_DOWN:
276	tipc_block_bearer(ib_ptr->bearer->name);
277	break;
278	case NETDEV_CHANGEMTU:
279	case NETDEV_CHANGEADDR:
280	tipc_block_bearer(ib_ptr->bearer->name);
281	tipc_continue(ib_ptr->bearer);
282	break;
283	case NETDEV_UNREGISTER:
284	case NETDEV_CHANGENAME:
285	tipc_disable_bearer(ib_ptr->bearer->name);
286	break;
287	}
288	return NOTIFY_OK;
289	}
290
291	static struct notifier_block notifier = {
292	.notifier_call = recv_notification,
293	.priority = 0,
294	};
295
296	/**
297	* ib_addr2str - convert InfiniBand address to string
298	*/
299	static int ib_addr2str(struct tipc_media_addr a, char str_buf, int str_size)
300	{
301	if (str_size < 60) /* 60 = 19 * strlen("xx:") + strlen("xx\0") */
302	return 1;
303
304	sprintf(str_buf, "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:"
305	"%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x",
306	a->value[0], a->value[1], a->value[2], a->value[3],
307	a->value[4], a->value[5], a->value[6], a->value[7],
308	a->value[8], a->value[9], a->value[10], a->value[11],
309	a->value[12], a->value[13], a->value[14], a->value[15],
310	a->value[16], a->value[17], a->value[18], a->value[19]);
311
312	return 0;
313	}
314
315	/**
316	* ib_addr2msg - convert InfiniBand address format to message header format
317	*/
318	static int ib_addr2msg(struct tipc_media_addr a, char msg_area)
319	{
320	memset(msg_area, 0, TIPC_MEDIA_ADDR_SIZE);
321	msg_area[TIPC_MEDIA_TYPE_OFFSET] = TIPC_MEDIA_TYPE_IB;
322	memcpy(msg_area, a->value, INFINIBAND_ALEN);
323	return 0;
324	}
325
326	/**
327	* ib_msg2addr - convert message header address format to InfiniBand format
328	*/
329	static int ib_msg2addr(const struct tipc_bearer *tb_ptr,
330	struct tipc_media_addr a, char msg_area)
331	{
332	ib_media_addr_set(tb_ptr, a, msg_area);
333	return 0;
334	}
335
336	/*
337	* InfiniBand media registration info
338	*/
339	static struct tipc_media ib_media_info = {
340	.send_msg = send_msg,
341	.enable_bearer = enable_bearer,
342	.disable_bearer = disable_bearer,
343	.addr2str = ib_addr2str,
344	.addr2msg = ib_addr2msg,
345	.msg2addr = ib_msg2addr,
346	.priority = TIPC_DEF_LINK_PRI,
347	.tolerance = TIPC_DEF_LINK_TOL,
348	.window = TIPC_DEF_LINK_WIN,
349	.type_id = TIPC_MEDIA_TYPE_IB,
350	.name = "ib"
351	};
352
353	/**
354	* tipc_ib_media_start - activate InfiniBand bearer support
355	*
356	* Register InfiniBand media type with TIPC bearer code. Also register
357	* with OS for notifications about device state changes.
358	*/
359	int tipc_ib_media_start(void)
360	{
361	int res;
362
363	if (ib_started)
364	return -EINVAL;
365
366	res = tipc_register_media(&ib_media_info);
367	if (res)
368	return res;
369
370	res = register_netdevice_notifier(&notifier);
371	if (!res)
372	ib_started = 1;
373	return res;
374	}
375
376	/**
377	* tipc_ib_media_stop - deactivate InfiniBand bearer support
378	*/
379	void tipc_ib_media_stop(void)
380	{
381	if (!ib_started)
382	return;
383
384	flush_scheduled_work();
385	unregister_netdevice_notifier(&notifier);
386	ib_started = 0;
387	}