Commit | Line | Data |
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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 | ||
b31fa5ba JP |
12 | #define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__ |
13 | ||
c72dfae2 SB |
14 | #include <linux/kernel.h> |
15 | #include <linux/if_arp.h> | |
16 | #include <linux/net.h> | |
17 | #include <linux/netdevice.h> | |
bd30ce4b | 18 | #include <linux/mutex.h> |
3a9a231d | 19 | #include <linux/module.h> |
0e4c7d85 | 20 | #include <linux/spinlock.h> |
c72dfae2 SB |
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> | |
c72dfae2 SB |
25 | #include <net/caif/caif_layer.h> |
26 | #include <net/caif/cfpkt.h> | |
27 | #include <net/caif/cfcnfg.h> | |
7c18d220 | 28 | #include <net/caif/cfserl.h> |
c72dfae2 SB |
29 | |
30 | MODULE_LICENSE("GPL"); | |
c72dfae2 SB |
31 | |
32 | /* Used for local tracking of the CAIF net devices */ | |
33 | struct caif_device_entry { | |
34 | struct cflayer layer; | |
35 | struct list_head list; | |
c72dfae2 | 36 | struct net_device *netdev; |
bd30ce4b | 37 | int __percpu *pcpu_refcnt; |
0e4c7d85 | 38 | spinlock_t flow_lock; |
7d311304 | 39 | struct sk_buff *xoff_skb; |
40 | void (*xoff_skb_dtor)(struct sk_buff *skb); | |
0e4c7d85 | 41 | bool xoff; |
c72dfae2 SB |
42 | }; |
43 | ||
44 | struct caif_device_entry_list { | |
45 | struct list_head list; | |
46 | /* Protects simulanous deletes in list */ | |
bd30ce4b | 47 | struct mutex lock; |
c72dfae2 SB |
48 | }; |
49 | ||
50 | struct caif_net { | |
bee925db | 51 | struct cfcnfg *cfg; |
c72dfae2 SB |
52 | struct caif_device_entry_list caifdevs; |
53 | }; | |
54 | ||
55 | static int caif_net_id; | |
0e4c7d85 | 56 | static int q_high = 50; /* Percent */ |
bee925db | 57 | |
58 | struct cfcnfg *get_cfcnfg(struct net *net) | |
59 | { | |
60 | struct caif_net *caifn; | |
61 | BUG_ON(!net); | |
62 | caifn = net_generic(net, caif_net_id); | |
7c18d220 | 63 | if (!caifn) |
64 | return NULL; | |
bee925db | 65 | return caifn->cfg; |
66 | } | |
67 | EXPORT_SYMBOL(get_cfcnfg); | |
c72dfae2 SB |
68 | |
69 | static struct caif_device_entry_list *caif_device_list(struct net *net) | |
70 | { | |
71 | struct caif_net *caifn; | |
72 | BUG_ON(!net); | |
73 | caifn = net_generic(net, caif_net_id); | |
7c18d220 | 74 | if (!caifn) |
75 | return NULL; | |
c72dfae2 SB |
76 | return &caifn->caifdevs; |
77 | } | |
78 | ||
bd30ce4b | 79 | static void caifd_put(struct caif_device_entry *e) |
80 | { | |
81 | irqsafe_cpu_dec(*e->pcpu_refcnt); | |
82 | } | |
83 | ||
84 | static void caifd_hold(struct caif_device_entry *e) | |
85 | { | |
86 | irqsafe_cpu_inc(*e->pcpu_refcnt); | |
87 | } | |
88 | ||
89 | static int caifd_refcnt_read(struct caif_device_entry *e) | |
90 | { | |
91 | int i, refcnt = 0; | |
92 | for_each_possible_cpu(i) | |
93 | refcnt += *per_cpu_ptr(e->pcpu_refcnt, i); | |
94 | return refcnt; | |
95 | } | |
96 | ||
c72dfae2 SB |
97 | /* Allocate new CAIF device. */ |
98 | static struct caif_device_entry *caif_device_alloc(struct net_device *dev) | |
99 | { | |
100 | struct caif_device_entry_list *caifdevs; | |
101 | struct caif_device_entry *caifd; | |
bd30ce4b | 102 | |
c72dfae2 | 103 | caifdevs = caif_device_list(dev_net(dev)); |
7c18d220 | 104 | if (!caifdevs) |
105 | return NULL; | |
bd30ce4b | 106 | |
4fb66b82 | 107 | caifd = kzalloc(sizeof(*caifd), GFP_KERNEL); |
c72dfae2 SB |
108 | if (!caifd) |
109 | return NULL; | |
bd30ce4b | 110 | caifd->pcpu_refcnt = alloc_percpu(int); |
4fb66b82 ED |
111 | if (!caifd->pcpu_refcnt) { |
112 | kfree(caifd); | |
113 | return NULL; | |
114 | } | |
c72dfae2 | 115 | caifd->netdev = dev; |
bd30ce4b | 116 | dev_hold(dev); |
c72dfae2 SB |
117 | return caifd; |
118 | } | |
119 | ||
120 | static struct caif_device_entry *caif_get(struct net_device *dev) | |
121 | { | |
122 | struct caif_device_entry_list *caifdevs = | |
123 | caif_device_list(dev_net(dev)); | |
124 | struct caif_device_entry *caifd; | |
7c18d220 | 125 | if (!caifdevs) |
126 | return NULL; | |
127 | ||
bd30ce4b | 128 | list_for_each_entry_rcu(caifd, &caifdevs->list, list) { |
c72dfae2 SB |
129 | if (caifd->netdev == dev) |
130 | return caifd; | |
131 | } | |
132 | return NULL; | |
133 | } | |
134 | ||
0e4c7d85 | 135 | void caif_flow_cb(struct sk_buff *skb) |
136 | { | |
137 | struct caif_device_entry *caifd; | |
7d311304 | 138 | void (*dtor)(struct sk_buff *skb) = NULL; |
0e4c7d85 | 139 | bool send_xoff; |
140 | ||
141 | WARN_ON(skb->dev == NULL); | |
142 | ||
143 | rcu_read_lock(); | |
144 | caifd = caif_get(skb->dev); | |
145 | caifd_hold(caifd); | |
146 | rcu_read_unlock(); | |
147 | ||
148 | spin_lock_bh(&caifd->flow_lock); | |
149 | send_xoff = caifd->xoff; | |
150 | caifd->xoff = 0; | |
7d311304 | 151 | if (!WARN_ON(caifd->xoff_skb_dtor == NULL)) { |
152 | WARN_ON(caifd->xoff_skb != skb); | |
153 | dtor = caifd->xoff_skb_dtor; | |
154 | caifd->xoff_skb = NULL; | |
155 | caifd->xoff_skb_dtor = NULL; | |
156 | } | |
0e4c7d85 | 157 | spin_unlock_bh(&caifd->flow_lock); |
158 | ||
7d311304 | 159 | if (dtor) |
160 | dtor(skb); | |
161 | ||
0e4c7d85 | 162 | if (send_xoff) |
163 | caifd->layer.up-> | |
164 | ctrlcmd(caifd->layer.up, | |
165 | _CAIF_CTRLCMD_PHYIF_FLOW_ON_IND, | |
166 | caifd->layer.id); | |
167 | caifd_put(caifd); | |
168 | } | |
169 | ||
c72dfae2 SB |
170 | static int transmit(struct cflayer *layer, struct cfpkt *pkt) |
171 | { | |
0e4c7d85 | 172 | int err, high = 0, qlen = 0; |
173 | struct caif_dev_common *caifdev; | |
c72dfae2 SB |
174 | struct caif_device_entry *caifd = |
175 | container_of(layer, struct caif_device_entry, layer); | |
4dd820c0 | 176 | struct sk_buff *skb; |
0e4c7d85 | 177 | struct netdev_queue *txq; |
178 | ||
179 | rcu_read_lock_bh(); | |
4dd820c0 | 180 | |
c72dfae2 SB |
181 | skb = cfpkt_tonative(pkt); |
182 | skb->dev = caifd->netdev; | |
7c18d220 | 183 | skb_reset_network_header(skb); |
184 | skb->protocol = htons(ETH_P_CAIF); | |
0e4c7d85 | 185 | caifdev = netdev_priv(caifd->netdev); |
186 | ||
187 | /* Check if we need to handle xoff */ | |
188 | if (likely(caifd->netdev->tx_queue_len == 0)) | |
189 | goto noxoff; | |
190 | ||
191 | if (unlikely(caifd->xoff)) | |
192 | goto noxoff; | |
193 | ||
194 | if (likely(!netif_queue_stopped(caifd->netdev))) { | |
195 | /* If we run with a TX queue, check if the queue is too long*/ | |
196 | txq = netdev_get_tx_queue(skb->dev, 0); | |
197 | qlen = qdisc_qlen(rcu_dereference_bh(txq->qdisc)); | |
198 | ||
199 | if (likely(qlen == 0)) | |
200 | goto noxoff; | |
201 | ||
202 | high = (caifd->netdev->tx_queue_len * q_high) / 100; | |
203 | if (likely(qlen < high)) | |
204 | goto noxoff; | |
205 | } | |
206 | ||
207 | /* Hold lock while accessing xoff */ | |
208 | spin_lock_bh(&caifd->flow_lock); | |
209 | if (caifd->xoff) { | |
210 | spin_unlock_bh(&caifd->flow_lock); | |
211 | goto noxoff; | |
212 | } | |
213 | ||
214 | /* | |
215 | * Handle flow off, we do this by temporary hi-jacking this | |
216 | * skb's destructor function, and replace it with our own | |
217 | * flow-on callback. The callback will set flow-on and call | |
218 | * the original destructor. | |
219 | */ | |
220 | ||
221 | pr_debug("queue has stopped(%d) or is full (%d > %d)\n", | |
222 | netif_queue_stopped(caifd->netdev), | |
223 | qlen, high); | |
224 | caifd->xoff = 1; | |
7d311304 | 225 | caifd->xoff_skb = skb; |
226 | caifd->xoff_skb_dtor = skb->destructor; | |
227 | skb->destructor = caif_flow_cb; | |
0e4c7d85 | 228 | spin_unlock_bh(&caifd->flow_lock); |
0e4c7d85 | 229 | |
230 | caifd->layer.up->ctrlcmd(caifd->layer.up, | |
231 | _CAIF_CTRLCMD_PHYIF_FLOW_OFF_IND, | |
232 | caifd->layer.id); | |
233 | noxoff: | |
234 | rcu_read_unlock_bh(); | |
4dd820c0 | 235 | |
c85c2951 | 236 | err = dev_queue_xmit(skb); |
237 | if (err > 0) | |
238 | err = -EIO; | |
c72dfae2 | 239 | |
c85c2951 | 240 | return err; |
c72dfae2 SB |
241 | } |
242 | ||
c72dfae2 | 243 | /* |
bd30ce4b | 244 | * Stuff received packets into the CAIF stack. |
c72dfae2 SB |
245 | * On error, returns non-zero and releases the skb. |
246 | */ | |
247 | static int receive(struct sk_buff *skb, struct net_device *dev, | |
248 | struct packet_type *pkttype, struct net_device *orig_dev) | |
249 | { | |
c72dfae2 SB |
250 | struct cfpkt *pkt; |
251 | struct caif_device_entry *caifd; | |
69c867c9 | 252 | int err; |
bd30ce4b | 253 | |
c72dfae2 | 254 | pkt = cfpkt_fromnative(CAIF_DIR_IN, skb); |
bd30ce4b | 255 | |
256 | rcu_read_lock(); | |
c72dfae2 | 257 | caifd = caif_get(dev); |
c72dfae2 | 258 | |
bd30ce4b | 259 | if (!caifd || !caifd->layer.up || !caifd->layer.up->receive || |
260 | !netif_oper_up(caifd->netdev)) { | |
261 | rcu_read_unlock(); | |
262 | kfree_skb(skb); | |
c72dfae2 | 263 | return NET_RX_DROP; |
bd30ce4b | 264 | } |
265 | ||
266 | /* Hold reference to netdevice while using CAIF stack */ | |
267 | caifd_hold(caifd); | |
268 | rcu_read_unlock(); | |
c72dfae2 | 269 | |
69c867c9 | 270 | err = caifd->layer.up->receive(caifd->layer.up, pkt); |
271 | ||
272 | /* For -EILSEQ the packet is not freed so so it now */ | |
273 | if (err == -EILSEQ) | |
274 | cfpkt_destroy(pkt); | |
bd30ce4b | 275 | |
276 | /* Release reference to stack upwards */ | |
277 | caifd_put(caifd); | |
7c18d220 | 278 | |
279 | if (err != 0) | |
280 | err = NET_RX_DROP; | |
281 | return err; | |
c72dfae2 SB |
282 | } |
283 | ||
284 | static struct packet_type caif_packet_type __read_mostly = { | |
285 | .type = cpu_to_be16(ETH_P_CAIF), | |
286 | .func = receive, | |
287 | }; | |
288 | ||
289 | static void dev_flowctrl(struct net_device *dev, int on) | |
290 | { | |
bd30ce4b | 291 | struct caif_device_entry *caifd; |
292 | ||
293 | rcu_read_lock(); | |
294 | ||
295 | caifd = caif_get(dev); | |
296 | if (!caifd || !caifd->layer.up || !caifd->layer.up->ctrlcmd) { | |
297 | rcu_read_unlock(); | |
c72dfae2 | 298 | return; |
bd30ce4b | 299 | } |
300 | ||
301 | caifd_hold(caifd); | |
302 | rcu_read_unlock(); | |
c72dfae2 SB |
303 | |
304 | caifd->layer.up->ctrlcmd(caifd->layer.up, | |
305 | on ? | |
306 | _CAIF_CTRLCMD_PHYIF_FLOW_ON_IND : | |
307 | _CAIF_CTRLCMD_PHYIF_FLOW_OFF_IND, | |
308 | caifd->layer.id); | |
bd30ce4b | 309 | caifd_put(caifd); |
c72dfae2 SB |
310 | } |
311 | ||
7c18d220 | 312 | void caif_enroll_dev(struct net_device *dev, struct caif_dev_common *caifdev, |
313 | struct cflayer *link_support, int head_room, | |
314 | struct cflayer **layer, int (**rcv_func)( | |
315 | struct sk_buff *, struct net_device *, | |
316 | struct packet_type *, struct net_device *)) | |
317 | { | |
318 | struct caif_device_entry *caifd; | |
319 | enum cfcnfg_phy_preference pref; | |
320 | struct cfcnfg *cfg = get_cfcnfg(dev_net(dev)); | |
321 | struct caif_device_entry_list *caifdevs; | |
322 | ||
323 | caifdevs = caif_device_list(dev_net(dev)); | |
324 | if (!cfg || !caifdevs) | |
325 | return; | |
326 | caifd = caif_device_alloc(dev); | |
327 | if (!caifd) | |
328 | return; | |
329 | *layer = &caifd->layer; | |
0e4c7d85 | 330 | spin_lock_init(&caifd->flow_lock); |
7c18d220 | 331 | |
332 | switch (caifdev->link_select) { | |
333 | case CAIF_LINK_HIGH_BANDW: | |
334 | pref = CFPHYPREF_HIGH_BW; | |
335 | break; | |
336 | case CAIF_LINK_LOW_LATENCY: | |
337 | pref = CFPHYPREF_LOW_LAT; | |
338 | break; | |
339 | default: | |
340 | pref = CFPHYPREF_HIGH_BW; | |
341 | break; | |
342 | } | |
343 | mutex_lock(&caifdevs->lock); | |
344 | list_add_rcu(&caifd->list, &caifdevs->list); | |
345 | ||
346 | strncpy(caifd->layer.name, dev->name, | |
347 | sizeof(caifd->layer.name) - 1); | |
348 | caifd->layer.name[sizeof(caifd->layer.name) - 1] = 0; | |
349 | caifd->layer.transmit = transmit; | |
350 | cfcnfg_add_phy_layer(cfg, | |
351 | dev, | |
352 | &caifd->layer, | |
353 | pref, | |
354 | link_support, | |
355 | caifdev->use_fcs, | |
356 | head_room); | |
357 | mutex_unlock(&caifdevs->lock); | |
358 | if (rcv_func) | |
359 | *rcv_func = receive; | |
360 | } | |
7ad65bf6 | 361 | EXPORT_SYMBOL(caif_enroll_dev); |
7c18d220 | 362 | |
c72dfae2 SB |
363 | /* notify Caif of device events */ |
364 | static int caif_device_notify(struct notifier_block *me, unsigned long what, | |
365 | void *arg) | |
366 | { | |
367 | struct net_device *dev = arg; | |
368 | struct caif_device_entry *caifd = NULL; | |
369 | struct caif_dev_common *caifdev; | |
bee925db | 370 | struct cfcnfg *cfg; |
7c18d220 | 371 | struct cflayer *layer, *link_support; |
372 | int head_room = 0; | |
08613e46 | 373 | struct caif_device_entry_list *caifdevs; |
c72dfae2 | 374 | |
bee925db | 375 | cfg = get_cfcnfg(dev_net(dev)); |
7c18d220 | 376 | caifdevs = caif_device_list(dev_net(dev)); |
377 | if (!cfg || !caifdevs) | |
bee925db | 378 | return 0; |
379 | ||
7c18d220 | 380 | caifd = caif_get(dev); |
381 | if (caifd == NULL && dev->type != ARPHRD_CAIF) | |
382 | return 0; | |
08613e46 | 383 | |
c72dfae2 SB |
384 | switch (what) { |
385 | case NETDEV_REGISTER: | |
7c18d220 | 386 | if (caifd != NULL) |
387 | break; | |
bd30ce4b | 388 | |
c72dfae2 | 389 | caifdev = netdev_priv(dev); |
c72dfae2 | 390 | |
7c18d220 | 391 | link_support = NULL; |
392 | if (caifdev->use_frag) { | |
393 | head_room = 1; | |
394 | link_support = cfserl_create(dev->ifindex, | |
e977b4cf | 395 | caifdev->use_stx); |
7c18d220 | 396 | if (!link_support) { |
397 | pr_warn("Out of memory\n"); | |
398 | break; | |
399 | } | |
c72dfae2 | 400 | } |
7c18d220 | 401 | caif_enroll_dev(dev, caifdev, link_support, head_room, |
402 | &layer, NULL); | |
403 | caifdev->flowctrl = dev_flowctrl; | |
c72dfae2 SB |
404 | break; |
405 | ||
bd30ce4b | 406 | case NETDEV_UP: |
407 | rcu_read_lock(); | |
408 | ||
c72dfae2 | 409 | caifd = caif_get(dev); |
bd30ce4b | 410 | if (caifd == NULL) { |
411 | rcu_read_unlock(); | |
c72dfae2 | 412 | break; |
bd30ce4b | 413 | } |
c72dfae2 | 414 | |
0e4c7d85 | 415 | caifd->xoff = 0; |
bd30ce4b | 416 | cfcnfg_set_phy_state(cfg, &caifd->layer, true); |
417 | rcu_read_unlock(); | |
c72dfae2 | 418 | |
c72dfae2 SB |
419 | break; |
420 | ||
421 | case NETDEV_DOWN: | |
bd30ce4b | 422 | rcu_read_lock(); |
423 | ||
c72dfae2 | 424 | caifd = caif_get(dev); |
bd30ce4b | 425 | if (!caifd || !caifd->layer.up || !caifd->layer.up->ctrlcmd) { |
426 | rcu_read_unlock(); | |
427 | return -EINVAL; | |
428 | } | |
429 | ||
430 | cfcnfg_set_phy_state(cfg, &caifd->layer, false); | |
431 | caifd_hold(caifd); | |
432 | rcu_read_unlock(); | |
433 | ||
434 | caifd->layer.up->ctrlcmd(caifd->layer.up, | |
435 | _CAIF_CTRLCMD_PHYIF_DOWN_IND, | |
436 | caifd->layer.id); | |
7d311304 | 437 | |
438 | spin_lock_bh(&caifd->flow_lock); | |
439 | ||
440 | /* | |
441 | * Replace our xoff-destructor with original destructor. | |
442 | * We trust that skb->destructor *always* is called before | |
443 | * the skb reference is invalid. The hijacked SKB destructor | |
444 | * takes the flow_lock so manipulating the skb->destructor here | |
445 | * should be safe. | |
446 | */ | |
447 | if (caifd->xoff_skb_dtor != NULL && caifd->xoff_skb != NULL) | |
448 | caifd->xoff_skb->destructor = caifd->xoff_skb_dtor; | |
449 | ||
450 | caifd->xoff = 0; | |
451 | caifd->xoff_skb_dtor = NULL; | |
452 | caifd->xoff_skb = NULL; | |
453 | ||
454 | spin_unlock_bh(&caifd->flow_lock); | |
bd30ce4b | 455 | caifd_put(caifd); |
c72dfae2 SB |
456 | break; |
457 | ||
458 | case NETDEV_UNREGISTER: | |
bd30ce4b | 459 | mutex_lock(&caifdevs->lock); |
460 | ||
c72dfae2 | 461 | caifd = caif_get(dev); |
bd30ce4b | 462 | if (caifd == NULL) { |
463 | mutex_unlock(&caifdevs->lock); | |
f2527ec4 | 464 | break; |
bd30ce4b | 465 | } |
466 | list_del_rcu(&caifd->list); | |
467 | ||
468 | /* | |
469 | * NETDEV_UNREGISTER is called repeatedly until all reference | |
470 | * counts for the net-device are released. If references to | |
471 | * caifd is taken, simply ignore NETDEV_UNREGISTER and wait for | |
472 | * the next call to NETDEV_UNREGISTER. | |
473 | * | |
474 | * If any packets are in flight down the CAIF Stack, | |
475 | * cfcnfg_del_phy_layer will return nonzero. | |
476 | * If no packets are in flight, the CAIF Stack associated | |
477 | * with the net-device un-registering is freed. | |
478 | */ | |
479 | ||
480 | if (caifd_refcnt_read(caifd) != 0 || | |
481 | cfcnfg_del_phy_layer(cfg, &caifd->layer) != 0) { | |
482 | ||
483 | pr_info("Wait for device inuse\n"); | |
484 | /* Enrole device if CAIF Stack is still in use */ | |
485 | list_add_rcu(&caifd->list, &caifdevs->list); | |
486 | mutex_unlock(&caifdevs->lock); | |
487 | break; | |
488 | } | |
489 | ||
490 | synchronize_rcu(); | |
491 | dev_put(caifd->netdev); | |
492 | free_percpu(caifd->pcpu_refcnt); | |
493 | kfree(caifd); | |
494 | ||
495 | mutex_unlock(&caifdevs->lock); | |
c72dfae2 SB |
496 | break; |
497 | } | |
498 | return 0; | |
499 | } | |
500 | ||
501 | static struct notifier_block caif_device_notifier = { | |
502 | .notifier_call = caif_device_notify, | |
503 | .priority = 0, | |
504 | }; | |
505 | ||
c72dfae2 SB |
506 | /* Per-namespace Caif devices handling */ |
507 | static int caif_init_net(struct net *net) | |
508 | { | |
509 | struct caif_net *caifn = net_generic(net, caif_net_id); | |
bee925db | 510 | BUG_ON(!caifn); |
c72dfae2 | 511 | INIT_LIST_HEAD(&caifn->caifdevs.list); |
bd30ce4b | 512 | mutex_init(&caifn->caifdevs.lock); |
bee925db | 513 | |
514 | caifn->cfg = cfcnfg_create(); | |
515 | if (!caifn->cfg) { | |
516 | pr_warn("can't create cfcnfg\n"); | |
517 | return -ENOMEM; | |
518 | } | |
519 | ||
c72dfae2 SB |
520 | return 0; |
521 | } | |
522 | ||
523 | static void caif_exit_net(struct net *net) | |
524 | { | |
bd30ce4b | 525 | struct caif_device_entry *caifd, *tmp; |
526 | struct caif_device_entry_list *caifdevs = | |
527 | caif_device_list(net); | |
7c18d220 | 528 | struct cfcnfg *cfg = get_cfcnfg(net); |
529 | ||
530 | if (!cfg || !caifdevs) | |
531 | return; | |
bd30ce4b | 532 | |
c72dfae2 | 533 | rtnl_lock(); |
bd30ce4b | 534 | mutex_lock(&caifdevs->lock); |
535 | ||
536 | list_for_each_entry_safe(caifd, tmp, &caifdevs->list, list) { | |
537 | int i = 0; | |
538 | list_del_rcu(&caifd->list); | |
539 | cfcnfg_set_phy_state(cfg, &caifd->layer, false); | |
540 | ||
541 | while (i < 10 && | |
542 | (caifd_refcnt_read(caifd) != 0 || | |
543 | cfcnfg_del_phy_layer(cfg, &caifd->layer) != 0)) { | |
544 | ||
545 | pr_info("Wait for device inuse\n"); | |
546 | msleep(250); | |
547 | i++; | |
548 | } | |
549 | synchronize_rcu(); | |
550 | dev_put(caifd->netdev); | |
551 | free_percpu(caifd->pcpu_refcnt); | |
552 | kfree(caifd); | |
c72dfae2 | 553 | } |
bee925db | 554 | cfcnfg_remove(cfg); |
bd30ce4b | 555 | |
556 | mutex_unlock(&caifdevs->lock); | |
c72dfae2 SB |
557 | rtnl_unlock(); |
558 | } | |
559 | ||
560 | static struct pernet_operations caif_net_ops = { | |
561 | .init = caif_init_net, | |
562 | .exit = caif_exit_net, | |
563 | .id = &caif_net_id, | |
564 | .size = sizeof(struct caif_net), | |
565 | }; | |
566 | ||
567 | /* Initialize Caif devices list */ | |
568 | static int __init caif_device_init(void) | |
569 | { | |
570 | int result; | |
bd30ce4b | 571 | |
c72dfae2 SB |
572 | result = register_pernet_device(&caif_net_ops); |
573 | ||
bee925db | 574 | if (result) |
c72dfae2 | 575 | return result; |
bee925db | 576 | |
c72dfae2 | 577 | register_netdevice_notifier(&caif_device_notifier); |
bee925db | 578 | dev_add_pack(&caif_packet_type); |
c72dfae2 SB |
579 | |
580 | return result; | |
c72dfae2 SB |
581 | } |
582 | ||
583 | static void __exit caif_device_exit(void) | |
584 | { | |
c72dfae2 SB |
585 | unregister_pernet_device(&caif_net_ops); |
586 | unregister_netdevice_notifier(&caif_device_notifier); | |
bee925db | 587 | dev_remove_pack(&caif_packet_type); |
c72dfae2 SB |
588 | } |
589 | ||
590 | module_init(caif_device_init); | |
591 | module_exit(caif_device_exit); |