[mirror_ubuntu-zesty-kernel.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_MEDIA		MAX_BEARERS

/**
 * struct ib_media - Infiniband media 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_media {
	struct tipc_bearer *bearer;
	struct net_device *dev;
	struct packet_type tipc_packet_type;
	struct work_struct setup;
	struct work_struct cleanup;
};

static struct ib_media ib_media_array[MAX_IB_MEDIA];
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_media *)(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_media *ib_ptr = (struct ib_media *)pt->af_packet_priv;

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

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

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

	dev_add_pack(&ib_ptr->tipc_packet_type);
}

/**
 * enable_media - attach TIPC bearer to an InfiniBand interface
 */
static int enable_media(struct tipc_bearer *tb_ptr)
{
	struct net_device *dev;
	struct ib_media *ib_ptr = &ib_media_array[0];
	struct ib_media *stop = &ib_media_array[MAX_IB_MEDIA];
	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_media);
	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;
	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_media *ib_ptr =
		container_of(work, struct ib_media, cleanup);

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

/**
 * disable_media - 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_media(struct tipc_bearer *tb_ptr)
{
	struct ib_media *ib_ptr = (struct ib_media *)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_media *ib_ptr = &ib_media_array[0];
	struct ib_media *stop = &ib_media_array[MAX_IB_MEDIA];

	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))
			break;
	case NETDEV_DOWN:
	case NETDEV_CHANGEMTU:
	case NETDEV_CHANGEADDR:
		tipc_reset_bearer(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, "%20phC", a->value);

	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
 */
struct tipc_media ib_media_info = {
	.send_msg	= send_msg,
	.enable_media	= enable_media,
	.disable_media	= disable_media,
	.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 = 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
4babbaa8	45	#define MAX_IB_MEDIA MAX_BEARERS
a29a194a PM	46
a29a194a PM	47	/**
4babbaa8	48	* struct ib_media - Infiniband media data structure
a29a194a PM	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
4babbaa8	55	struct ib_media {
a29a194a PM	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
4babbaa8	63	static struct ib_media ib_media_array[MAX_IB_MEDIA];
a29a194a PM	64	static int ib_started;
	65
	66	/**
	67	* ib_media_addr_set - initialize Infiniband media address structure
	68	*
	69	* Media-dependent "value" field stores MAC address in first 6 bytes
	70	* and zeroes out the remaining bytes.
	71	*/
	72	static void ib_media_addr_set(const struct tipc_bearer *tb_ptr,
	73	struct tipc_media_addr a, char mac)
	74	{
	75	BUILD_BUG_ON(sizeof(a->value) < INFINIBAND_ALEN);
	76	memcpy(a->value, mac, INFINIBAND_ALEN);
	77	a->media_id = TIPC_MEDIA_TYPE_IB;
	78	a->broadcast = !memcmp(mac, tb_ptr->bcast_addr.value, INFINIBAND_ALEN);
	79	}
	80
	81	/**
	82	* send_msg - send a TIPC message out over an InfiniBand interface
	83	*/
	84	static int send_msg(struct sk_buff buf, struct tipc_bearer tb_ptr,
	85	struct tipc_media_addr *dest)
	86	{
	87	struct sk_buff *clone;
	88	struct net_device *dev;
	89	int delta;
	90
	91	clone = skb_clone(buf, GFP_ATOMIC);
	92	if (!clone)
	93	return 0;
	94
4babbaa8	95	dev = ((struct ib_media *)(tb_ptr->usr_handle))->dev;
a29a194a PM	96	delta = dev->hard_header_len - skb_headroom(buf);
	97
	98	if ((delta > 0) &&
	99	pskb_expand_head(clone, SKB_DATA_ALIGN(delta), 0, GFP_ATOMIC)) {
	100	kfree_skb(clone);
	101	return 0;
	102	}
	103
	104	skb_reset_network_header(clone);
	105	clone->dev = dev;
	106	clone->protocol = htons(ETH_P_TIPC);
	107	dev_hard_header(clone, dev, ETH_P_TIPC, dest->value,
	108	dev->dev_addr, clone->len);
	109	dev_queue_xmit(clone);
	110	return 0;
	111	}
	112
	113	/**
	114	* recv_msg - handle incoming TIPC message from an InfiniBand interface
	115	*
	116	* Accept only packets explicitly sent to this node, or broadcast packets;
	117	* ignores packets sent using InfiniBand multicast, and traffic sent to other
	118	* nodes (which can happen if interface is running in promiscuous mode).
	119	*/
	120	static int recv_msg(struct sk_buff buf, struct net_device dev,
	121	struct packet_type pt, struct net_device orig_dev)
	122	{
4babbaa8	123	struct ib_media ib_ptr = (struct ib_media )pt->af_packet_priv;
a29a194a PM	124
	125	if (!net_eq(dev_net(dev), &init_net)) {
	126	kfree_skb(buf);
67981583	127	return NET_RX_DROP;
a29a194a PM	128	}
	129
	130	if (likely(ib_ptr->bearer)) {
	131	if (likely(buf->pkt_type <= PACKET_BROADCAST)) {
	132	buf->next = NULL;
	133	tipc_recv_msg(buf, ib_ptr->bearer);
67981583	134	return NET_RX_SUCCESS;
a29a194a PM	135	}
	136	}
	137	kfree_skb(buf);
67981583	138	return NET_RX_DROP;
a29a194a PM	139	}
	140
	141	/**
	142	* setup_bearer - setup association between InfiniBand bearer and interface
	143	*/
4babbaa8	144	static void setup_media(struct work_struct *work)
a29a194a	145	{
4babbaa8 YX	146	struct ib_media *ib_ptr =
4babbaa8 YX	147	container_of(work, struct ib_media, setup);
a29a194a PM	148
	149	dev_add_pack(&ib_ptr->tipc_packet_type);
	150	}
	151
	152	/**
4babbaa8	153	* enable_media - attach TIPC bearer to an InfiniBand interface
a29a194a	154	*/
4babbaa8	155	static int enable_media(struct tipc_bearer *tb_ptr)
a29a194a	156	{
2537af9d	157	struct net_device *dev;
4babbaa8 YX	158	struct ib_media *ib_ptr = &ib_media_array[0];
4babbaa8 YX	159	struct ib_media *stop = &ib_media_array[MAX_IB_MEDIA];
a29a194a PM	160	char driver_name = strchr((const char )tb_ptr->name, ':') + 1;
	161	int pending_dev = 0;
	162
	163	/* Find unused InfiniBand bearer structure */
	164	while (ib_ptr->dev) {
	165	if (!ib_ptr->bearer)
	166	pending_dev++;
	167	if (++ib_ptr == stop)
	168	return pending_dev ? -EAGAIN : -EDQUOT;
	169	}
	170
	171	/* Find device with specified name */
2537af9d	172	dev = dev_get_by_name(&init_net, driver_name);
a29a194a PM	173	if (!dev)
	174	return -ENODEV;
	175
	176	/* Create InfiniBand bearer for device */
	177	ib_ptr->dev = dev;
	178	ib_ptr->tipc_packet_type.type = htons(ETH_P_TIPC);
	179	ib_ptr->tipc_packet_type.dev = dev;
	180	ib_ptr->tipc_packet_type.func = recv_msg;
	181	ib_ptr->tipc_packet_type.af_packet_priv = ib_ptr;
	182	INIT_LIST_HEAD(&(ib_ptr->tipc_packet_type.list));
4babbaa8	183	INIT_WORK(&ib_ptr->setup, setup_media);
a29a194a PM	184	schedule_work(&ib_ptr->setup);
	185
	186	/* Associate TIPC bearer with InfiniBand bearer */
	187	ib_ptr->bearer = tb_ptr;
	188	tb_ptr->usr_handle = (void *)ib_ptr;
	189	memset(tb_ptr->bcast_addr.value, 0, sizeof(tb_ptr->bcast_addr.value));
	190	memcpy(tb_ptr->bcast_addr.value, dev->broadcast, INFINIBAND_ALEN);
	191	tb_ptr->bcast_addr.media_id = TIPC_MEDIA_TYPE_IB;
	192	tb_ptr->bcast_addr.broadcast = 1;
	193	tb_ptr->mtu = dev->mtu;
a29a194a PM	194	ib_media_addr_set(tb_ptr, &tb_ptr->addr, (char *)dev->dev_addr);
	195	return 0;
	196	}
	197
	198	/**
	199	* cleanup_bearer - break association between InfiniBand bearer and interface
	200	*
	201	* This routine must be invoked from a work queue because it can sleep.
	202	*/
	203	static void cleanup_bearer(struct work_struct *work)
	204	{
4babbaa8 YX	205	struct ib_media *ib_ptr =
4babbaa8 YX	206	container_of(work, struct ib_media, cleanup);
a29a194a PM	207
	208	dev_remove_pack(&ib_ptr->tipc_packet_type);
	209	dev_put(ib_ptr->dev);
	210	ib_ptr->dev = NULL;
	211	}
	212
	213	/**
4babbaa8	214	* disable_media - detach TIPC bearer from an InfiniBand interface
a29a194a PM	215	*
	216	* Mark InfiniBand bearer as inactive so that incoming buffers are thrown away,
	217	* then get worker thread to complete bearer cleanup. (Can't do cleanup
	218	* here because cleanup code needs to sleep and caller holds spinlocks.)
	219	*/
4babbaa8	220	static void disable_media(struct tipc_bearer *tb_ptr)
a29a194a	221	{
4babbaa8	222	struct ib_media ib_ptr = (struct ib_media )tb_ptr->usr_handle;
a29a194a PM	223
	224	ib_ptr->bearer = NULL;
	225	INIT_WORK(&ib_ptr->cleanup, cleanup_bearer);
	226	schedule_work(&ib_ptr->cleanup);
	227	}
	228
	229	/**
	230	* recv_notification - handle device updates from OS
	231	*
	232	* Change the state of the InfiniBand bearer (if any) associated with the
	233	* specified device.
	234	*/
	235	static int recv_notification(struct notifier_block *nb, unsigned long evt,
351638e7	236	void *ptr)
a29a194a	237	{
351638e7	238	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
4babbaa8 YX	239	struct ib_media *ib_ptr = &ib_media_array[0];
4babbaa8 YX	240	struct ib_media *stop = &ib_media_array[MAX_IB_MEDIA];
a29a194a PM	241
	242	if (!net_eq(dev_net(dev), &init_net))
	243	return NOTIFY_DONE;
	244
	245	while ((ib_ptr->dev != dev)) {
	246	if (++ib_ptr == stop)
	247	return NOTIFY_DONE; /* couldn't find device */
	248	}
	249	if (!ib_ptr->bearer)
	250	return NOTIFY_DONE; /* bearer had been disabled */
	251
	252	ib_ptr->bearer->mtu = dev->mtu;
	253
	254	switch (evt) {
	255	case NETDEV_CHANGE:
	256	if (netif_carrier_ok(dev))
512137ee	257	break;
a29a194a	258	case NETDEV_DOWN:
a29a194a PM	259	case NETDEV_CHANGEMTU:
a29a194a PM	260	case NETDEV_CHANGEADDR:
512137ee	261	tipc_reset_bearer(ib_ptr->bearer);
a29a194a PM	262	break;
	263	case NETDEV_UNREGISTER:
	264	case NETDEV_CHANGENAME:
	265	tipc_disable_bearer(ib_ptr->bearer->name);
	266	break;
	267	}
	268	return NOTIFY_OK;
	269	}
	270
	271	static struct notifier_block notifier = {
	272	.notifier_call = recv_notification,
	273	.priority = 0,
	274	};
	275
	276	/**
	277	* ib_addr2str - convert InfiniBand address to string
	278	*/
	279	static int ib_addr2str(struct tipc_media_addr a, char str_buf, int str_size)
	280	{
	281	if (str_size < 60) /* 60 = 19 * strlen("xx:") + strlen("xx\0") */
	282	return 1;
	283
d77e41e1	284	sprintf(str_buf, "%20phC", a->value);
a29a194a PM	285
	286	return 0;
	287	}
	288
	289	/**
	290	* ib_addr2msg - convert InfiniBand address format to message header format
	291	*/
	292	static int ib_addr2msg(struct tipc_media_addr a, char msg_area)
	293	{
	294	memset(msg_area, 0, TIPC_MEDIA_ADDR_SIZE);
	295	msg_area[TIPC_MEDIA_TYPE_OFFSET] = TIPC_MEDIA_TYPE_IB;
	296	memcpy(msg_area, a->value, INFINIBAND_ALEN);
	297	return 0;
	298	}
	299
	300	/**
	301	* ib_msg2addr - convert message header address format to InfiniBand format
	302	*/
	303	static int ib_msg2addr(const struct tipc_bearer *tb_ptr,
	304	struct tipc_media_addr a, char msg_area)
	305	{
	306	ib_media_addr_set(tb_ptr, a, msg_area);
	307	return 0;
	308	}
	309
	310	/*
	311	* InfiniBand media registration info
	312	*/
5702dbab	313	struct tipc_media ib_media_info = {
a29a194a	314	.send_msg = send_msg,
4babbaa8 YX	315	.enable_media = enable_media,
4babbaa8 YX	316	.disable_media = disable_media,
a29a194a PM	317	.addr2str = ib_addr2str,
	318	.addr2msg = ib_addr2msg,
	319	.msg2addr = ib_msg2addr,
	320	.priority = TIPC_DEF_LINK_PRI,
	321	.tolerance = TIPC_DEF_LINK_TOL,
	322	.window = TIPC_DEF_LINK_WIN,
	323	.type_id = TIPC_MEDIA_TYPE_IB,
	324	.name = "ib"
	325	};
	326
	327	/**
	328	* tipc_ib_media_start - activate InfiniBand bearer support
	329	*
	330	* Register InfiniBand media type with TIPC bearer code. Also register
	331	* with OS for notifications about device state changes.
	332	*/
	333	int tipc_ib_media_start(void)
	334	{
	335	int res;
	336
	337	if (ib_started)
	338	return -EINVAL;
	339
a29a194a PM	340	res = register_netdevice_notifier(&notifier);
	341	if (!res)
	342	ib_started = 1;
	343	return res;
	344	}
	345
	346	/**
	347	* tipc_ib_media_stop - deactivate InfiniBand bearer support
	348	*/
	349	void tipc_ib_media_stop(void)
	350	{
	351	if (!ib_started)
	352	return;
	353
	354	flush_scheduled_work();
	355	unregister_netdevice_notifier(&notifier);
	356	ib_started = 0;
	357	}