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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; | |
333 | if (connect_req_to_link_param(get_caif_conf(), conn_req, ¶m) == 0) | |
334 | /* Hook up the adaptation layer. */ | |
335 | return cfcnfg_add_adaptation_layer(get_caif_conf(), | |
336 | ¶m, client_layer); | |
337 | ||
338 | return -EINVAL; | |
339 | ||
340 | caif_assert(0); | |
341 | } | |
342 | EXPORT_SYMBOL(caif_connect_client); | |
343 | ||
344 | int caif_disconnect_client(struct cflayer *adap_layer) | |
345 | { | |
346 | return cfcnfg_del_adapt_layer(get_caif_conf(), adap_layer); | |
347 | } | |
348 | EXPORT_SYMBOL(caif_disconnect_client); | |
349 | ||
350 | /* Per-namespace Caif devices handling */ | |
351 | static int caif_init_net(struct net *net) | |
352 | { | |
353 | struct caif_net *caifn = net_generic(net, caif_net_id); | |
354 | INIT_LIST_HEAD(&caifn->caifdevs.list); | |
355 | spin_lock_init(&caifn->caifdevs.lock); | |
356 | return 0; | |
357 | } | |
358 | ||
359 | static void caif_exit_net(struct net *net) | |
360 | { | |
361 | struct net_device *dev; | |
362 | int res; | |
363 | rtnl_lock(); | |
364 | for_each_netdev(net, dev) { | |
365 | if (dev->type != ARPHRD_CAIF) | |
366 | continue; | |
367 | res = dev_close(dev); | |
368 | caif_device_destroy(dev); | |
369 | } | |
370 | rtnl_unlock(); | |
371 | } | |
372 | ||
373 | static struct pernet_operations caif_net_ops = { | |
374 | .init = caif_init_net, | |
375 | .exit = caif_exit_net, | |
376 | .id = &caif_net_id, | |
377 | .size = sizeof(struct caif_net), | |
378 | }; | |
379 | ||
380 | /* Initialize Caif devices list */ | |
381 | static int __init caif_device_init(void) | |
382 | { | |
383 | int result; | |
384 | cfg = cfcnfg_create(); | |
385 | if (!cfg) { | |
386 | pr_warning("CAIF: %s(): can't create cfcnfg.\n", __func__); | |
387 | goto err_cfcnfg_create_failed; | |
388 | } | |
389 | result = register_pernet_device(&caif_net_ops); | |
390 | ||
391 | if (result) { | |
392 | kfree(cfg); | |
393 | cfg = NULL; | |
394 | return result; | |
395 | } | |
396 | dev_add_pack(&caif_packet_type); | |
397 | register_netdevice_notifier(&caif_device_notifier); | |
398 | ||
399 | return result; | |
400 | err_cfcnfg_create_failed: | |
401 | return -ENODEV; | |
402 | } | |
403 | ||
404 | static void __exit caif_device_exit(void) | |
405 | { | |
406 | dev_remove_pack(&caif_packet_type); | |
407 | unregister_pernet_device(&caif_net_ops); | |
408 | unregister_netdevice_notifier(&caif_device_notifier); | |
409 | cfcnfg_remove(cfg); | |
410 | } | |
411 | ||
412 | module_init(caif_device_init); | |
413 | module_exit(caif_device_exit); |