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
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>
12 #define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__
14 #include <linux/version.h>
15 #include <linux/module.h>
16 #include <linux/kernel.h>
17 #include <linux/if_arp.h>
18 #include <linux/net.h>
19 #include <linux/netdevice.h>
20 #include <linux/skbuff.h>
21 #include <linux/sched.h>
22 #include <linux/wait.h>
23 #include <net/netns/generic.h>
24 #include <net/net_namespace.h>
25 #include <net/pkt_sched.h>
26 #include <net/caif/caif_device.h>
27 #include <net/caif/caif_dev.h>
28 #include <net/caif/caif_layer.h>
29 #include <net/caif/cfpkt.h>
30 #include <net/caif/cfcnfg.h>
32 MODULE_LICENSE("GPL");
33 #define TIMEOUT (HZ*5)
35 /* Used for local tracking of the CAIF net devices */
36 struct caif_device_entry {
38 struct list_head list;
42 struct net_device *netdev;
43 wait_queue_head_t event;
46 struct caif_device_entry_list {
47 struct list_head list;
48 /* Protects simulanous deletes in list */
53 struct caif_device_entry_list caifdevs;
56 static int caif_net_id;
57 static struct cfcnfg *cfg;
59 static struct caif_device_entry_list *caif_device_list(struct net *net)
61 struct caif_net *caifn;
63 caifn = net_generic(net, caif_net_id);
65 return &caifn->caifdevs;
68 /* Allocate new CAIF device. */
69 static struct caif_device_entry *caif_device_alloc(struct net_device *dev)
71 struct caif_device_entry_list *caifdevs;
72 struct caif_device_entry *caifd;
73 caifdevs = caif_device_list(dev_net(dev));
75 caifd = kzalloc(sizeof(*caifd), GFP_ATOMIC);
79 list_add(&caifd->list, &caifdevs->list);
80 init_waitqueue_head(&caifd->event);
84 static struct caif_device_entry *caif_get(struct net_device *dev)
86 struct caif_device_entry_list *caifdevs =
87 caif_device_list(dev_net(dev));
88 struct caif_device_entry *caifd;
90 list_for_each_entry(caifd, &caifdevs->list, list) {
91 if (caifd->netdev == dev)
97 static void caif_device_destroy(struct net_device *dev)
99 struct caif_device_entry_list *caifdevs =
100 caif_device_list(dev_net(dev));
101 struct caif_device_entry *caifd;
103 if (dev->type != ARPHRD_CAIF)
106 spin_lock_bh(&caifdevs->lock);
107 caifd = caif_get(dev);
109 spin_unlock_bh(&caifdevs->lock);
113 list_del(&caifd->list);
114 spin_unlock_bh(&caifdevs->lock);
119 static int transmit(struct cflayer *layer, struct cfpkt *pkt)
121 struct caif_device_entry *caifd =
122 container_of(layer, struct caif_device_entry, layer);
125 skb = cfpkt_tonative(pkt);
126 skb->dev = caifd->netdev;
133 static int modemcmd(struct cflayer *layr, enum caif_modemcmd ctrl)
135 struct caif_device_entry *caifd;
136 struct caif_dev_common *caifdev;
137 caifd = container_of(layr, struct caif_device_entry, layer);
138 caifdev = netdev_priv(caifd->netdev);
139 if (ctrl == _CAIF_MODEMCMD_PHYIF_USEFULL) {
140 atomic_set(&caifd->in_use, 1);
141 wake_up_interruptible(&caifd->event);
143 } else if (ctrl == _CAIF_MODEMCMD_PHYIF_USELESS) {
144 atomic_set(&caifd->in_use, 0);
145 wake_up_interruptible(&caifd->event);
151 * Stuff received packets to associated sockets.
152 * On error, returns non-zero and releases the skb.
154 static int receive(struct sk_buff *skb, struct net_device *dev,
155 struct packet_type *pkttype, struct net_device *orig_dev)
159 struct caif_device_entry *caifd;
161 pkt = cfpkt_fromnative(CAIF_DIR_IN, skb);
162 caifd = caif_get(dev);
163 if (!caifd || !caifd->layer.up || !caifd->layer.up->receive)
166 if (caifd->layer.up->receive(caifd->layer.up, pkt))
172 static struct packet_type caif_packet_type __read_mostly = {
173 .type = cpu_to_be16(ETH_P_CAIF),
177 static void dev_flowctrl(struct net_device *dev, int on)
179 struct caif_device_entry *caifd = caif_get(dev);
180 if (!caifd || !caifd->layer.up || !caifd->layer.up->ctrlcmd)
183 caifd->layer.up->ctrlcmd(caifd->layer.up,
185 _CAIF_CTRLCMD_PHYIF_FLOW_ON_IND :
186 _CAIF_CTRLCMD_PHYIF_FLOW_OFF_IND,
190 /* notify Caif of device events */
191 static int caif_device_notify(struct notifier_block *me, unsigned long what,
194 struct net_device *dev = arg;
195 struct caif_device_entry *caifd = NULL;
196 struct caif_dev_common *caifdev;
197 enum cfcnfg_phy_preference pref;
199 enum cfcnfg_phy_type phy_type;
201 if (dev->type != ARPHRD_CAIF)
205 case NETDEV_REGISTER:
206 netdev_info(dev, "register\n");
207 caifd = caif_device_alloc(dev);
210 caifdev = netdev_priv(dev);
211 caifdev->flowctrl = dev_flowctrl;
212 atomic_set(&caifd->state, what);
217 netdev_info(dev, "up\n");
218 caifd = caif_get(dev);
221 caifdev = netdev_priv(dev);
222 if (atomic_read(&caifd->state) == NETDEV_UP) {
223 netdev_info(dev, "already up\n");
226 atomic_set(&caifd->state, what);
227 caifd->layer.transmit = transmit;
228 caifd->layer.modemcmd = modemcmd;
230 if (caifdev->use_frag)
231 phy_type = CFPHYTYPE_FRAG;
233 phy_type = CFPHYTYPE_CAIF;
235 switch (caifdev->link_select) {
236 case CAIF_LINK_HIGH_BANDW:
237 pref = CFPHYPREF_HIGH_BW;
239 case CAIF_LINK_LOW_LATENCY:
240 pref = CFPHYPREF_LOW_LAT;
243 pref = CFPHYPREF_HIGH_BW;
247 cfcnfg_add_phy_layer(cfg,
255 strncpy(caifd->layer.name, dev->name,
256 sizeof(caifd->layer.name) - 1);
257 caifd->layer.name[sizeof(caifd->layer.name) - 1] = 0;
260 case NETDEV_GOING_DOWN:
261 caifd = caif_get(dev);
264 netdev_info(dev, "going down\n");
266 if (atomic_read(&caifd->state) == NETDEV_GOING_DOWN ||
267 atomic_read(&caifd->state) == NETDEV_DOWN)
270 atomic_set(&caifd->state, what);
271 if (!caifd || !caifd->layer.up || !caifd->layer.up->ctrlcmd)
273 caifd->layer.up->ctrlcmd(caifd->layer.up,
274 _CAIF_CTRLCMD_PHYIF_DOWN_IND,
277 res = wait_event_interruptible_timeout(caifd->event,
278 atomic_read(&caifd->in_use) == 0,
283 caifd = caif_get(dev);
286 netdev_info(dev, "down\n");
287 if (atomic_read(&caifd->in_use))
289 "Unregistering an active CAIF device\n");
290 cfcnfg_del_phy_layer(cfg, &caifd->layer);
292 atomic_set(&caifd->state, what);
295 case NETDEV_UNREGISTER:
296 caifd = caif_get(dev);
299 netdev_info(dev, "unregister\n");
300 atomic_set(&caifd->state, what);
301 caif_device_destroy(dev);
307 static struct notifier_block caif_device_notifier = {
308 .notifier_call = caif_device_notify,
312 int caif_connect_client(struct caif_connect_request *conn_req,
313 struct cflayer *client_layer, int *ifindex,
314 int *headroom, int *tailroom)
316 struct cfctrl_link_param param;
319 ret = caif_connect_req_to_link_param(cfg, conn_req, ¶m);
322 /* Hook up the adaptation layer. */
323 return cfcnfg_add_adaptation_layer(cfg, ¶m,
324 client_layer, ifindex,
327 EXPORT_SYMBOL(caif_connect_client);
329 int caif_disconnect_client(struct cflayer *adap_layer)
331 return cfcnfg_disconn_adapt_layer(cfg, adap_layer);
333 EXPORT_SYMBOL(caif_disconnect_client);
335 /* Per-namespace Caif devices handling */
336 static int caif_init_net(struct net *net)
338 struct caif_net *caifn = net_generic(net, caif_net_id);
339 INIT_LIST_HEAD(&caifn->caifdevs.list);
340 spin_lock_init(&caifn->caifdevs.lock);
344 static void caif_exit_net(struct net *net)
346 struct net_device *dev;
349 for_each_netdev(net, dev) {
350 if (dev->type != ARPHRD_CAIF)
352 res = dev_close(dev);
353 caif_device_destroy(dev);
358 static struct pernet_operations caif_net_ops = {
359 .init = caif_init_net,
360 .exit = caif_exit_net,
362 .size = sizeof(struct caif_net),
365 /* Initialize Caif devices list */
366 static int __init caif_device_init(void)
369 cfg = cfcnfg_create();
371 pr_warn("can't create cfcnfg\n");
372 goto err_cfcnfg_create_failed;
374 result = register_pernet_device(&caif_net_ops);
381 dev_add_pack(&caif_packet_type);
382 register_netdevice_notifier(&caif_device_notifier);
385 err_cfcnfg_create_failed:
389 static void __exit caif_device_exit(void)
391 dev_remove_pack(&caif_packet_type);
392 unregister_pernet_device(&caif_net_ops);
393 unregister_netdevice_notifier(&caif_device_notifier);
397 module_init(caif_device_init);
398 module_exit(caif_device_exit);