[deliverable/linux.git] / net / caif / caif_dev.c

/*
 * CAIF Interface registration.
 * Copyright (C) ST-Ericsson AB 2010
 * Author:	Sjur Brendeland/sjur.brandeland@stericsson.com
 * License terms: GNU General Public License (GPL) version 2
 *
 * Borrowed heavily from file: pn_dev.c. Thanks to
 *  Remi Denis-Courmont <remi.denis-courmont@nokia.com>
 *  and Sakari Ailus <sakari.ailus@nokia.com>
 */

#include <linux/version.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/if_arp.h>
#include <linux/net.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/sched.h>
#include <linux/wait.h>
#include <net/netns/generic.h>
#include <net/net_namespace.h>
#include <net/pkt_sched.h>
#include <net/caif/caif_device.h>
#include <net/caif/caif_dev.h>
#include <net/caif/caif_layer.h>
#include <net/caif/cfpkt.h>
#include <net/caif/cfcnfg.h>

MODULE_LICENSE("GPL");
#define TIMEOUT (HZ*5)

/* Used for local tracking of the CAIF net devices */
struct caif_device_entry {
	struct cflayer layer;
	struct list_head list;
	atomic_t in_use;
	atomic_t state;
	u16 phyid;
	struct net_device *netdev;
	wait_queue_head_t event;
};

struct caif_device_entry_list {
	struct list_head list;
	/* Protects simulanous deletes in list */
	spinlock_t lock;
};

struct caif_net {
	struct caif_device_entry_list caifdevs;
};

static int caif_net_id;
static struct cfcnfg *cfg;

static struct caif_device_entry_list *caif_device_list(struct net *net)
{
	struct caif_net *caifn;
	BUG_ON(!net);
	caifn = net_generic(net, caif_net_id);
	BUG_ON(!caifn);
	return &caifn->caifdevs;
}

/* Allocate new CAIF device. */
static struct caif_device_entry *caif_device_alloc(struct net_device *dev)
{
	struct caif_device_entry_list *caifdevs;
	struct caif_device_entry *caifd;
	caifdevs = caif_device_list(dev_net(dev));
	BUG_ON(!caifdevs);
	caifd = kzalloc(sizeof(*caifd), GFP_ATOMIC);
	if (!caifd)
		return NULL;
	caifd->netdev = dev;
	list_add(&caifd->list, &caifdevs->list);
	init_waitqueue_head(&caifd->event);
	return caifd;
}

static struct caif_device_entry *caif_get(struct net_device *dev)
{
	struct caif_device_entry_list *caifdevs =
	    caif_device_list(dev_net(dev));
	struct caif_device_entry *caifd;
	BUG_ON(!caifdevs);
	list_for_each_entry(caifd, &caifdevs->list, list) {
		if (caifd->netdev == dev)
			return caifd;
	}
	return NULL;
}

static void caif_device_destroy(struct net_device *dev)
{
	struct caif_device_entry_list *caifdevs =
	    caif_device_list(dev_net(dev));
	struct caif_device_entry *caifd;
	ASSERT_RTNL();
	if (dev->type != ARPHRD_CAIF)
		return;

	spin_lock_bh(&caifdevs->lock);
	caifd = caif_get(dev);
	if (caifd == NULL) {
		spin_unlock_bh(&caifdevs->lock);
		return;
	}

	list_del(&caifd->list);
	spin_unlock_bh(&caifdevs->lock);

	kfree(caifd);
	return;
}

static int transmit(struct cflayer *layer, struct cfpkt *pkt)
{
	struct caif_device_entry *caifd =
	    container_of(layer, struct caif_device_entry, layer);
	struct sk_buff *skb, *skb2;
	int ret = -EINVAL;
	skb = cfpkt_tonative(pkt);
	skb->dev = caifd->netdev;
	/*
	 * Don't allow SKB to be destroyed upon error, but signal resend
	 * notification to clients. We can't rely on the return value as
	 * congestion (NET_XMIT_CN) sometimes drops the packet, sometimes don't.
	 */
	if (netif_queue_stopped(caifd->netdev))
		return -EAGAIN;
	skb2 = skb_get(skb);

	ret = dev_queue_xmit(skb2);

	if (!ret)
		kfree_skb(skb);
	else
		return -EAGAIN;

	return 0;
}

static int modemcmd(struct cflayer *layr, enum caif_modemcmd ctrl)
{
	struct caif_device_entry *caifd;
	struct caif_dev_common *caifdev;
	caifd = container_of(layr, struct caif_device_entry, layer);
	caifdev = netdev_priv(caifd->netdev);
	if (ctrl == _CAIF_MODEMCMD_PHYIF_USEFULL) {
		atomic_set(&caifd->in_use, 1);
		wake_up_interruptible(&caifd->event);

	} else if (ctrl == _CAIF_MODEMCMD_PHYIF_USELESS) {
		atomic_set(&caifd->in_use, 0);
		wake_up_interruptible(&caifd->event);
	}
	return 0;
}

/*
 * Stuff received packets to associated sockets.
 * On error, returns non-zero and releases the skb.
 */
static int receive(struct sk_buff *skb, struct net_device *dev,
		   struct packet_type *pkttype, struct net_device *orig_dev)
{
	struct net *net;
	struct cfpkt *pkt;
	struct caif_device_entry *caifd;
	net = dev_net(dev);
	pkt = cfpkt_fromnative(CAIF_DIR_IN, skb);
	caifd = caif_get(dev);
	if (!caifd || !caifd->layer.up || !caifd->layer.up->ctrlcmd)
		return NET_RX_DROP;

	if (caifd->layer.up->receive(caifd->layer.up, pkt))
		return NET_RX_DROP;

	return 0;
}

static struct packet_type caif_packet_type __read_mostly = {
	.type = cpu_to_be16(ETH_P_CAIF),
	.func = receive,
};

static void dev_flowctrl(struct net_device *dev, int on)
{
	struct caif_device_entry *caifd = caif_get(dev);
	if (!caifd || !caifd->layer.up || !caifd->layer.up->ctrlcmd)
		return;

	caifd->layer.up->ctrlcmd(caifd->layer.up,
				 on ?
				 _CAIF_CTRLCMD_PHYIF_FLOW_ON_IND :
				 _CAIF_CTRLCMD_PHYIF_FLOW_OFF_IND,
				 caifd->layer.id);
}

/* notify Caif of device events */
static int caif_device_notify(struct notifier_block *me, unsigned long what,
			      void *arg)
{
	struct net_device *dev = arg;
	struct caif_device_entry *caifd = NULL;
	struct caif_dev_common *caifdev;
	enum cfcnfg_phy_preference pref;
	int res = -EINVAL;
	enum cfcnfg_phy_type phy_type;

	if (dev->type != ARPHRD_CAIF)
		return 0;

	switch (what) {
	case NETDEV_REGISTER:
		pr_info("CAIF: %s():register %s\n", __func__, dev->name);
		caifd = caif_device_alloc(dev);
		if (caifd == NULL)
			break;
		caifdev = netdev_priv(dev);
		caifdev->flowctrl = dev_flowctrl;
		atomic_set(&caifd->state, what);
		res = 0;
		break;

	case NETDEV_UP:
		pr_info("CAIF: %s(): up %s\n", __func__, dev->name);
		caifd = caif_get(dev);
		if (caifd == NULL)
			break;
		caifdev = netdev_priv(dev);
		if (atomic_read(&caifd->state) == NETDEV_UP) {
			pr_info("CAIF: %s():%s already up\n",
				__func__, dev->name);
			break;
		}
		atomic_set(&caifd->state, what);
		caifd->layer.transmit = transmit;
		caifd->layer.modemcmd = modemcmd;

		if (caifdev->use_frag)
			phy_type = CFPHYTYPE_FRAG;
		else
			phy_type = CFPHYTYPE_CAIF;

		switch (caifdev->link_select) {
		case CAIF_LINK_HIGH_BANDW:
			pref = CFPHYPREF_LOW_LAT;
			break;
		case CAIF_LINK_LOW_LATENCY:
			pref = CFPHYPREF_HIGH_BW;
			break;
		default:
			pref = CFPHYPREF_HIGH_BW;
			break;
		}

		cfcnfg_add_phy_layer(get_caif_conf(),
				     phy_type,
				     dev,
				     &caifd->layer,
				     &caifd->phyid,
				     pref,
				     caifdev->use_fcs,
				     caifdev->use_stx);
		strncpy(caifd->layer.name, dev->name,
			sizeof(caifd->layer.name) - 1);
		caifd->layer.name[sizeof(caifd->layer.name) - 1] = 0;
		break;

	case NETDEV_GOING_DOWN:
		caifd = caif_get(dev);
		if (caifd == NULL)
			break;
		pr_info("CAIF: %s():going down %s\n", __func__, dev->name);

		if (atomic_read(&caifd->state) == NETDEV_GOING_DOWN ||
			atomic_read(&caifd->state) == NETDEV_DOWN)
			break;

		atomic_set(&caifd->state, what);
		if (!caifd || !caifd->layer.up || !caifd->layer.up->ctrlcmd)
			return -EINVAL;
		caifd->layer.up->ctrlcmd(caifd->layer.up,
					 _CAIF_CTRLCMD_PHYIF_DOWN_IND,
					 caifd->layer.id);
		res = wait_event_interruptible_timeout(caifd->event,
					atomic_read(&caifd->in_use) == 0,
					TIMEOUT);
		break;

	case NETDEV_DOWN:
		caifd = caif_get(dev);
		if (caifd == NULL)
			break;
		pr_info("CAIF: %s(): down %s\n", __func__, dev->name);
		if (atomic_read(&caifd->in_use))
			pr_warning("CAIF: %s(): "
				   "Unregistering an active CAIF device: %s\n",
				   __func__, dev->name);
		cfcnfg_del_phy_layer(get_caif_conf(), &caifd->layer);
		atomic_set(&caifd->state, what);
		break;

	case NETDEV_UNREGISTER:
		caifd = caif_get(dev);
		pr_info("CAIF: %s(): unregister %s\n", __func__, dev->name);
		atomic_set(&caifd->state, what);
		caif_device_destroy(dev);
		break;
	}
	return 0;
}

static struct notifier_block caif_device_notifier = {
	.notifier_call = caif_device_notify,
	.priority = 0,
};


struct cfcnfg *get_caif_conf(void)
{
	return cfg;
}
EXPORT_SYMBOL(get_caif_conf);

int caif_connect_client(struct caif_connect_request *conn_req,
			   struct cflayer *client_layer)
{
	struct cfctrl_link_param param;
	int ret;
	ret = connect_req_to_link_param(get_caif_conf(), conn_req, &param);
	if (ret)
		return ret;
	/* Hook up the adaptation layer. */
	return cfcnfg_add_adaptation_layer(get_caif_conf(),
						&param, client_layer);
}
EXPORT_SYMBOL(caif_connect_client);

int caif_disconnect_client(struct cflayer *adap_layer)
{
       return cfcnfg_disconn_adapt_layer(get_caif_conf(), adap_layer);
}
EXPORT_SYMBOL(caif_disconnect_client);

void caif_release_client(struct cflayer *adap_layer)
{
       cfcnfg_release_adap_layer(adap_layer);
}
EXPORT_SYMBOL(caif_release_client);

/* Per-namespace Caif devices handling */
static int caif_init_net(struct net *net)
{
	struct caif_net *caifn = net_generic(net, caif_net_id);
	INIT_LIST_HEAD(&caifn->caifdevs.list);
	spin_lock_init(&caifn->caifdevs.lock);
	return 0;
}

static void caif_exit_net(struct net *net)
{
	struct net_device *dev;
	int res;
	rtnl_lock();
	for_each_netdev(net, dev) {
		if (dev->type != ARPHRD_CAIF)
			continue;
		res = dev_close(dev);
		caif_device_destroy(dev);
	}
	rtnl_unlock();
}

static struct pernet_operations caif_net_ops = {
	.init = caif_init_net,
	.exit = caif_exit_net,
	.id   = &caif_net_id,
	.size = sizeof(struct caif_net),
};

/* Initialize Caif devices list */
static int __init caif_device_init(void)
{
	int result;
	cfg = cfcnfg_create();
	if (!cfg) {
		pr_warning("CAIF: %s(): can't create cfcnfg.\n", __func__);
		goto err_cfcnfg_create_failed;
	}
	result = register_pernet_device(&caif_net_ops);

	if (result) {
		kfree(cfg);
		cfg = NULL;
		return result;
	}
	dev_add_pack(&caif_packet_type);
	register_netdevice_notifier(&caif_device_notifier);

	return result;
err_cfcnfg_create_failed:
	return -ENODEV;
}

static void __exit caif_device_exit(void)
{
	dev_remove_pack(&caif_packet_type);
	unregister_pernet_device(&caif_net_ops);
	unregister_netdevice_notifier(&caif_device_notifier);
	cfcnfg_remove(cfg);
}

module_init(caif_device_init);
module_exit(caif_device_exit);
Commit	Line	Data
c72dfae2 SB	1	/*
	2	* CAIF Interface registration.
	3	* Copyright (C) ST-Ericsson AB 2010
	4	* Author: Sjur Brendeland/sjur.brandeland@stericsson.com
	5	* License terms: GNU General Public License (GPL) version 2
	6	*
	7	* Borrowed heavily from file: pn_dev.c. Thanks to
	8	* Remi Denis-Courmont <remi.denis-courmont@nokia.com>
	9	* and Sakari Ailus <sakari.ailus@nokia.com>
	10	*/
	11
	12	#include <linux/version.h>
	13	#include <linux/module.h>
	14	#include <linux/kernel.h>
	15	#include <linux/if_arp.h>
	16	#include <linux/net.h>
	17	#include <linux/netdevice.h>
	18	#include <linux/skbuff.h>
	19	#include <linux/sched.h>
	20	#include <linux/wait.h>
	21	#include <net/netns/generic.h>
	22	#include <net/net_namespace.h>
	23	#include <net/pkt_sched.h>
	24	#include <net/caif/caif_device.h>
	25	#include <net/caif/caif_dev.h>
	26	#include <net/caif/caif_layer.h>
	27	#include <net/caif/cfpkt.h>
	28	#include <net/caif/cfcnfg.h>
	29
	30	MODULE_LICENSE("GPL");
	31	#define TIMEOUT (HZ*5)
	32
	33	/* Used for local tracking of the CAIF net devices */
	34	struct caif_device_entry {
	35	struct cflayer layer;
	36	struct list_head list;
	37	atomic_t in_use;
	38	atomic_t state;
	39	u16 phyid;
	40	struct net_device *netdev;
	41	wait_queue_head_t event;
	42	};
	43
	44	struct caif_device_entry_list {
	45	struct list_head list;
	46	/* Protects simulanous deletes in list */
	47	spinlock_t lock;
	48	};
	49
	50	struct caif_net {
	51	struct caif_device_entry_list caifdevs;
	52	};
	53
	54	static int caif_net_id;
	55	static struct cfcnfg *cfg;
	56
	57	static struct caif_device_entry_list caif_device_list(struct net net)
	58	{
	59	struct caif_net *caifn;
	60	BUG_ON(!net);
	61	caifn = net_generic(net, caif_net_id);
	62	BUG_ON(!caifn);
	63	return &caifn->caifdevs;
	64	}
65
66	/* Allocate new CAIF device. */
67	static struct caif_device_entry caif_device_alloc(struct net_device dev)
68	{
69	struct caif_device_entry_list *caifdevs;
70	struct caif_device_entry *caifd;
71	caifdevs = caif_device_list(dev_net(dev));
72	BUG_ON(!caifdevs);
73	caifd = kzalloc(sizeof(*caifd), GFP_ATOMIC);
74	if (!caifd)
75	return NULL;
76	caifd->netdev = dev;
77	list_add(&caifd->list, &caifdevs->list);
78	init_waitqueue_head(&caifd->event);
79	return caifd;
80	}
81
82	static struct caif_device_entry caif_get(struct net_device dev)
83	{
84	struct caif_device_entry_list *caifdevs =
85	caif_device_list(dev_net(dev));
86	struct caif_device_entry *caifd;
87	BUG_ON(!caifdevs);
88	list_for_each_entry(caifd, &caifdevs->list, list) {
89	if (caifd->netdev == dev)
90	return caifd;
91	}
92	return NULL;
93	}
94
95	static void caif_device_destroy(struct net_device *dev)
96	{
97	struct caif_device_entry_list *caifdevs =
98	caif_device_list(dev_net(dev));
99	struct caif_device_entry *caifd;
100	ASSERT_RTNL();
101	if (dev->type != ARPHRD_CAIF)
102	return;
103
104	spin_lock_bh(&caifdevs->lock);
105	caifd = caif_get(dev);
106	if (caifd == NULL) {
107	spin_unlock_bh(&caifdevs->lock);
108	return;
109	}
110
111	list_del(&caifd->list);
112	spin_unlock_bh(&caifdevs->lock);
113
114	kfree(caifd);
115	return;
116	}
117
118	static int transmit(struct cflayer layer, struct cfpkt pkt)
119	{
120	struct caif_device_entry *caifd =
121	container_of(layer, struct caif_device_entry, layer);
122	struct sk_buff skb, skb2;
123	int ret = -EINVAL;
124	skb = cfpkt_tonative(pkt);
125	skb->dev = caifd->netdev;
126	/*
127	* Don't allow SKB to be destroyed upon error, but signal resend
128	* notification to clients. We can't rely on the return value as
129	* congestion (NET_XMIT_CN) sometimes drops the packet, sometimes don't.
130	*/
131	if (netif_queue_stopped(caifd->netdev))
132	return -EAGAIN;
133	skb2 = skb_get(skb);
134
135	ret = dev_queue_xmit(skb2);
136
137	if (!ret)
138	kfree_skb(skb);
139	else
140	return -EAGAIN;
141
142	return 0;
143	}
144
145	static int modemcmd(struct cflayer *layr, enum caif_modemcmd ctrl)
146	{
147	struct caif_device_entry *caifd;
148	struct caif_dev_common *caifdev;
149	caifd = container_of(layr, struct caif_device_entry, layer);
150	caifdev = netdev_priv(caifd->netdev);
151	if (ctrl == _CAIF_MODEMCMD_PHYIF_USEFULL) {
152	atomic_set(&caifd->in_use, 1);
153	wake_up_interruptible(&caifd->event);
154
155	} else if (ctrl == _CAIF_MODEMCMD_PHYIF_USELESS) {
156	atomic_set(&caifd->in_use, 0);
157	wake_up_interruptible(&caifd->event);
158	}
159	return 0;
160	}
161
162	/*
163	* Stuff received packets to associated sockets.
164	* On error, returns non-zero and releases the skb.
165	*/
166	static int receive(struct sk_buff skb, struct net_device dev,
167	struct packet_type pkttype, struct net_device orig_dev)
168	{
169	struct net *net;
170	struct cfpkt *pkt;
171	struct caif_device_entry *caifd;
172	net = dev_net(dev);
173	pkt = cfpkt_fromnative(CAIF_DIR_IN, skb);
174	caifd = caif_get(dev);
175	if (!caifd \|\| !caifd->layer.up \|\| !caifd->layer.up->ctrlcmd)
176	return NET_RX_DROP;
177
178	if (caifd->layer.up->receive(caifd->layer.up, pkt))
179	return NET_RX_DROP;
180
181	return 0;
182	}
183
184	static struct packet_type caif_packet_type __read_mostly = {
185	.type = cpu_to_be16(ETH_P_CAIF),
186	.func = receive,
187	};
188
189	static void dev_flowctrl(struct net_device *dev, int on)
190	{
191	struct caif_device_entry *caifd = caif_get(dev);
192	if (!caifd \|\| !caifd->layer.up \|\| !caifd->layer.up->ctrlcmd)
193	return;
194
195	caifd->layer.up->ctrlcmd(caifd->layer.up,
196	on ?
197	_CAIF_CTRLCMD_PHYIF_FLOW_ON_IND :
198	_CAIF_CTRLCMD_PHYIF_FLOW_OFF_IND,
199	caifd->layer.id);
200	}
201
202	/* notify Caif of device events */
203	static int caif_device_notify(struct notifier_block *me, unsigned long what,
204	void *arg)
205	{
206	struct net_device *dev = arg;
207	struct caif_device_entry *caifd = NULL;
208	struct caif_dev_common *caifdev;
209	enum cfcnfg_phy_preference pref;
210	int res = -EINVAL;
211	enum cfcnfg_phy_type phy_type;
212
213	if (dev->type != ARPHRD_CAIF)
214	return 0;
215
216	switch (what) {
217	case NETDEV_REGISTER:
218	pr_info("CAIF: %s():register %s\n", __func__, dev->name);
219	caifd = caif_device_alloc(dev);
220	if (caifd == NULL)
221	break;
222	caifdev = netdev_priv(dev);
223	caifdev->flowctrl = dev_flowctrl;
224	atomic_set(&caifd->state, what);
225	res = 0;
226	break;
227
228	case NETDEV_UP:
229	pr_info("CAIF: %s(): up %s\n", __func__, dev->name);
230	caifd = caif_get(dev);
231	if (caifd == NULL)
232	break;
233	caifdev = netdev_priv(dev);
234	if (atomic_read(&caifd->state) == NETDEV_UP) {
235	pr_info("CAIF: %s():%s already up\n",
236	__func__, dev->name);
237	break;
238	}
239	atomic_set(&caifd->state, what);
240	caifd->layer.transmit = transmit;
241	caifd->layer.modemcmd = modemcmd;
242
243	if (caifdev->use_frag)
244	phy_type = CFPHYTYPE_FRAG;
245	else
246	phy_type = CFPHYTYPE_CAIF;
247
248	switch (caifdev->link_select) {
249	case CAIF_LINK_HIGH_BANDW:
250	pref = CFPHYPREF_LOW_LAT;
251	break;
252	case CAIF_LINK_LOW_LATENCY:
253	pref = CFPHYPREF_HIGH_BW;
254	break;
255	default:
256	pref = CFPHYPREF_HIGH_BW;
257	break;
258	}
259
260	cfcnfg_add_phy_layer(get_caif_conf(),
261	phy_type,
262	dev,
263	&caifd->layer,
264	&caifd->phyid,
265	pref,
266	caifdev->use_fcs,
267	caifdev->use_stx);
268	strncpy(caifd->layer.name, dev->name,
269	sizeof(caifd->layer.name) - 1);
270	caifd->layer.name[sizeof(caifd->layer.name) - 1] = 0;
271	break;
272
273	case NETDEV_GOING_DOWN:
274	caifd = caif_get(dev);
275	if (caifd == NULL)
276	break;
277	pr_info("CAIF: %s():going down %s\n", __func__, dev->name);
278
279	if (atomic_read(&caifd->state) == NETDEV_GOING_DOWN \|\|
280	atomic_read(&caifd->state) == NETDEV_DOWN)
281	break;
282
283	atomic_set(&caifd->state, what);
284	if (!caifd \|\| !caifd->layer.up \|\| !caifd->layer.up->ctrlcmd)
285	return -EINVAL;
286	caifd->layer.up->ctrlcmd(caifd->layer.up,
287	_CAIF_CTRLCMD_PHYIF_DOWN_IND,
288	caifd->layer.id);
289	res = wait_event_interruptible_timeout(caifd->event,
290	atomic_read(&caifd->in_use) == 0,
291	TIMEOUT);
292	break;
293
294	case NETDEV_DOWN:
295	caifd = caif_get(dev);
296	if (caifd == NULL)
297	break;
298	pr_info("CAIF: %s(): down %s\n", __func__, dev->name);
299	if (atomic_read(&caifd->in_use))
300	pr_warning("CAIF: %s(): "
301	"Unregistering an active CAIF device: %s\n",
302	__func__, dev->name);
303	cfcnfg_del_phy_layer(get_caif_conf(), &caifd->layer);
304	atomic_set(&caifd->state, what);
305	break;
306
307	case NETDEV_UNREGISTER:
308	caifd = caif_get(dev);
309	pr_info("CAIF: %s(): unregister %s\n", __func__, dev->name);
310	atomic_set(&caifd->state, what);
311	caif_device_destroy(dev);
312	break;
313	}
314	return 0;
315	}
316
317	static struct notifier_block caif_device_notifier = {
318	.notifier_call = caif_device_notify,
319	.priority = 0,
320	};
321
322
323	struct cfcnfg *get_caif_conf(void)
324	{
325	return cfg;
326	}
327	EXPORT_SYMBOL(get_caif_conf);
328
329	int caif_connect_client(struct caif_connect_request *conn_req,
330	struct cflayer *client_layer)
331	{
332	struct cfctrl_link_param param;
e539d83c SB	333	int ret;
	334	ret = connect_req_to_link_param(get_caif_conf(), conn_req, &param);
	335	if (ret)
	336	return ret;
	337	/* Hook up the adaptation layer. */
	338	return cfcnfg_add_adaptation_layer(get_caif_conf(),
c72dfae2	339	&param, client_layer);
c72dfae2 SB	340	}
	341	EXPORT_SYMBOL(caif_connect_client);
	342
	343	int caif_disconnect_client(struct cflayer *adap_layer)
	344	{
e539d83c	345	return cfcnfg_disconn_adapt_layer(get_caif_conf(), adap_layer);
c72dfae2 SB	346	}
	347	EXPORT_SYMBOL(caif_disconnect_client);
	348
5b208656 SB	349	void caif_release_client(struct cflayer *adap_layer)
	350	{
	351	cfcnfg_release_adap_layer(adap_layer);
	352	}
	353	EXPORT_SYMBOL(caif_release_client);
	354
c72dfae2 SB	355	/* Per-namespace Caif devices handling */
	356	static int caif_init_net(struct net *net)
	357	{
	358	struct caif_net *caifn = net_generic(net, caif_net_id);
	359	INIT_LIST_HEAD(&caifn->caifdevs.list);
	360	spin_lock_init(&caifn->caifdevs.lock);
	361	return 0;
	362	}
	363
	364	static void caif_exit_net(struct net *net)
	365	{
	366	struct net_device *dev;
	367	int res;
	368	rtnl_lock();
	369	for_each_netdev(net, dev) {
	370	if (dev->type != ARPHRD_CAIF)
	371	continue;
	372	res = dev_close(dev);
	373	caif_device_destroy(dev);
	374	}
	375	rtnl_unlock();
	376	}
	377
	378	static struct pernet_operations caif_net_ops = {
	379	.init = caif_init_net,
	380	.exit = caif_exit_net,
	381	.id = &caif_net_id,
	382	.size = sizeof(struct caif_net),
	383	};
	384
	385	/* Initialize Caif devices list */
	386	static int __init caif_device_init(void)
	387	{
	388	int result;
	389	cfg = cfcnfg_create();
	390	if (!cfg) {
	391	pr_warning("CAIF: %s(): can't create cfcnfg.\n", __func__);
	392	goto err_cfcnfg_create_failed;
	393	}
	394	result = register_pernet_device(&caif_net_ops);
	395
	396	if (result) {
	397	kfree(cfg);
	398	cfg = NULL;
	399	return result;
	400	}
	401	dev_add_pack(&caif_packet_type);
	402	register_netdevice_notifier(&caif_device_notifier);
	403
	404	return result;
	405	err_cfcnfg_create_failed:
	406	return -ENODEV;
	407	}
	408
	409	static void __exit caif_device_exit(void)
	410	{
	411	dev_remove_pack(&caif_packet_type);
	412	unregister_pernet_device(&caif_net_ops);
	413	unregister_netdevice_notifier(&caif_device_notifier);
	414	cfcnfg_remove(cfg);
	415	}
	416
	417	module_init(caif_device_init);
	418	module_exit(caif_device_exit);