blob: d730a0f68f46b43b3e8dd51cb3bb029f04cde93a [file] [log] [blame]
Sjur Braendelandc72dfae2010-03-30 13:56:25 +00001/*
2 * CAIF Interface registration.
3 * Copyright (C) ST-Ericsson AB 2010
sjur.brandeland@stericsson.com26ee65e2013-04-22 23:57:01 +00004 * Author: Sjur Brendeland
Sjur Braendelandc72dfae2010-03-30 13:56:25 +00005 * License terms: GNU General Public License (GPL) version 2
6 *
Rémi Denis-Courmont31fdc552012-06-13 22:29:03 +00007 * Borrowed heavily from file: pn_dev.c. Thanks to Remi Denis-Courmont
Sjur Braendelandc72dfae2010-03-30 13:56:25 +00008 * and Sakari Ailus <sakari.ailus@nokia.com>
9 */
10
Joe Perchesb31fa5b2010-09-05 21:31:11 +000011#define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__
12
Sjur Braendelandc72dfae2010-03-30 13:56:25 +000013#include <linux/kernel.h>
14#include <linux/if_arp.h>
15#include <linux/net.h>
16#include <linux/netdevice.h>
sjur.brandeland@stericsson.combd30ce42011-05-13 02:44:00 +000017#include <linux/mutex.h>
Paul Gortmaker3a9a2312011-05-27 09:12:25 -040018#include <linux/module.h>
sjur.brandeland@stericsson.com0e4c7d82011-12-04 11:22:54 +000019#include <linux/spinlock.h>
Sjur Braendelandc72dfae2010-03-30 13:56:25 +000020#include <net/netns/generic.h>
21#include <net/net_namespace.h>
22#include <net/pkt_sched.h>
23#include <net/caif/caif_device.h>
Sjur Braendelandc72dfae2010-03-30 13:56:25 +000024#include <net/caif/caif_layer.h>
Rashika Kheria82032742014-02-09 19:59:04 +053025#include <net/caif/caif_dev.h>
Sjur Braendelandc72dfae2010-03-30 13:56:25 +000026#include <net/caif/cfpkt.h>
27#include <net/caif/cfcnfg.h>
sjur.brandeland@stericsson.com7c18d222011-11-30 09:22:47 +000028#include <net/caif/cfserl.h>
Sjur Braendelandc72dfae2010-03-30 13:56:25 +000029
30MODULE_LICENSE("GPL");
Sjur Braendelandc72dfae2010-03-30 13:56:25 +000031
32/* Used for local tracking of the CAIF net devices */
33struct caif_device_entry {
34 struct cflayer layer;
35 struct list_head list;
Sjur Braendelandc72dfae2010-03-30 13:56:25 +000036 struct net_device *netdev;
sjur.brandeland@stericsson.combd30ce42011-05-13 02:44:00 +000037 int __percpu *pcpu_refcnt;
sjur.brandeland@stericsson.com0e4c7d82011-12-04 11:22:54 +000038 spinlock_t flow_lock;
sjur.brandeland@stericsson.com7d311302011-12-04 11:22:55 +000039 struct sk_buff *xoff_skb;
40 void (*xoff_skb_dtor)(struct sk_buff *skb);
sjur.brandeland@stericsson.com0e4c7d82011-12-04 11:22:54 +000041 bool xoff;
Sjur Braendelandc72dfae2010-03-30 13:56:25 +000042};
43
44struct caif_device_entry_list {
45 struct list_head list;
46 /* Protects simulanous deletes in list */
sjur.brandeland@stericsson.combd30ce42011-05-13 02:44:00 +000047 struct mutex lock;
Sjur Braendelandc72dfae2010-03-30 13:56:25 +000048};
49
50struct caif_net {
sjur.brandeland@stericsson.combee925d2011-05-13 02:44:05 +000051 struct cfcnfg *cfg;
Sjur Braendelandc72dfae2010-03-30 13:56:25 +000052 struct caif_device_entry_list caifdevs;
53};
54
55static int caif_net_id;
sjur.brandeland@stericsson.com0e4c7d82011-12-04 11:22:54 +000056static int q_high = 50; /* Percent */
sjur.brandeland@stericsson.combee925d2011-05-13 02:44:05 +000057
58struct cfcnfg *get_cfcnfg(struct net *net)
59{
60 struct caif_net *caifn;
sjur.brandeland@stericsson.combee925d2011-05-13 02:44:05 +000061 caifn = net_generic(net, caif_net_id);
sjur.brandeland@stericsson.combee925d2011-05-13 02:44:05 +000062 return caifn->cfg;
63}
64EXPORT_SYMBOL(get_cfcnfg);
Sjur Braendelandc72dfae2010-03-30 13:56:25 +000065
66static struct caif_device_entry_list *caif_device_list(struct net *net)
67{
68 struct caif_net *caifn;
Sjur Braendelandc72dfae2010-03-30 13:56:25 +000069 caifn = net_generic(net, caif_net_id);
Sjur Braendelandc72dfae2010-03-30 13:56:25 +000070 return &caifn->caifdevs;
71}
72
sjur.brandeland@stericsson.combd30ce42011-05-13 02:44:00 +000073static void caifd_put(struct caif_device_entry *e)
74{
Christoph Lameter933393f2011-12-22 11:58:51 -060075 this_cpu_dec(*e->pcpu_refcnt);
sjur.brandeland@stericsson.combd30ce42011-05-13 02:44:00 +000076}
77
78static void caifd_hold(struct caif_device_entry *e)
79{
Christoph Lameter933393f2011-12-22 11:58:51 -060080 this_cpu_inc(*e->pcpu_refcnt);
sjur.brandeland@stericsson.combd30ce42011-05-13 02:44:00 +000081}
82
83static int caifd_refcnt_read(struct caif_device_entry *e)
84{
85 int i, refcnt = 0;
86 for_each_possible_cpu(i)
87 refcnt += *per_cpu_ptr(e->pcpu_refcnt, i);
88 return refcnt;
89}
90
Sjur Braendelandc72dfae2010-03-30 13:56:25 +000091/* Allocate new CAIF device. */
92static struct caif_device_entry *caif_device_alloc(struct net_device *dev)
93{
Sjur Braendelandc72dfae2010-03-30 13:56:25 +000094 struct caif_device_entry *caifd;
sjur.brandeland@stericsson.combd30ce42011-05-13 02:44:00 +000095
Eric Dumazet4fb66b82011-09-02 02:19:23 +000096 caifd = kzalloc(sizeof(*caifd), GFP_KERNEL);
Sjur Braendelandc72dfae2010-03-30 13:56:25 +000097 if (!caifd)
98 return NULL;
sjur.brandeland@stericsson.combd30ce42011-05-13 02:44:00 +000099 caifd->pcpu_refcnt = alloc_percpu(int);
Eric Dumazet4fb66b82011-09-02 02:19:23 +0000100 if (!caifd->pcpu_refcnt) {
101 kfree(caifd);
102 return NULL;
103 }
Sjur Braendelandc72dfae2010-03-30 13:56:25 +0000104 caifd->netdev = dev;
sjur.brandeland@stericsson.combd30ce42011-05-13 02:44:00 +0000105 dev_hold(dev);
Sjur Braendelandc72dfae2010-03-30 13:56:25 +0000106 return caifd;
107}
108
109static struct caif_device_entry *caif_get(struct net_device *dev)
110{
111 struct caif_device_entry_list *caifdevs =
112 caif_device_list(dev_net(dev));
113 struct caif_device_entry *caifd;
sjur.brandeland@stericsson.com7c18d222011-11-30 09:22:47 +0000114
sjur.brandeland@stericsson.combd30ce42011-05-13 02:44:00 +0000115 list_for_each_entry_rcu(caifd, &caifdevs->list, list) {
Sjur Braendelandc72dfae2010-03-30 13:56:25 +0000116 if (caifd->netdev == dev)
117 return caifd;
118 }
119 return NULL;
120}
121
Silviu-Mihai Popescud6e89c02013-03-02 09:45:19 +0000122static void caif_flow_cb(struct sk_buff *skb)
sjur.brandeland@stericsson.com0e4c7d82011-12-04 11:22:54 +0000123{
124 struct caif_device_entry *caifd;
sjur.brandeland@stericsson.com7d311302011-12-04 11:22:55 +0000125 void (*dtor)(struct sk_buff *skb) = NULL;
sjur.brandeland@stericsson.com0e4c7d82011-12-04 11:22:54 +0000126 bool send_xoff;
127
128 WARN_ON(skb->dev == NULL);
129
130 rcu_read_lock();
131 caifd = caif_get(skb->dev);
Kim Lilliestierna XXc95567c2012-06-25 07:49:34 +0000132
133 WARN_ON(caifd == NULL);
134 if (caifd == NULL)
135 return;
136
sjur.brandeland@stericsson.com0e4c7d82011-12-04 11:22:54 +0000137 caifd_hold(caifd);
138 rcu_read_unlock();
139
140 spin_lock_bh(&caifd->flow_lock);
141 send_xoff = caifd->xoff;
142 caifd->xoff = 0;
sjur.brandeland@stericsson.com59f608d2012-01-17 03:03:14 +0000143 dtor = caifd->xoff_skb_dtor;
144
145 if (WARN_ON(caifd->xoff_skb != skb))
146 skb = NULL;
147
148 caifd->xoff_skb = NULL;
149 caifd->xoff_skb_dtor = NULL;
150
sjur.brandeland@stericsson.com0e4c7d82011-12-04 11:22:54 +0000151 spin_unlock_bh(&caifd->flow_lock);
152
sjur.brandeland@stericsson.com59f608d2012-01-17 03:03:14 +0000153 if (dtor && skb)
sjur.brandeland@stericsson.com7d311302011-12-04 11:22:55 +0000154 dtor(skb);
155
sjur.brandeland@stericsson.com0e4c7d82011-12-04 11:22:54 +0000156 if (send_xoff)
157 caifd->layer.up->
158 ctrlcmd(caifd->layer.up,
159 _CAIF_CTRLCMD_PHYIF_FLOW_ON_IND,
160 caifd->layer.id);
161 caifd_put(caifd);
162}
163
Sjur Braendelandc72dfae2010-03-30 13:56:25 +0000164static int transmit(struct cflayer *layer, struct cfpkt *pkt)
165{
sjur.brandeland@stericsson.com0e4c7d82011-12-04 11:22:54 +0000166 int err, high = 0, qlen = 0;
Sjur Braendelandc72dfae2010-03-30 13:56:25 +0000167 struct caif_device_entry *caifd =
168 container_of(layer, struct caif_device_entry, layer);
Sjur Brændeland4dd820c2011-04-11 10:43:51 +0000169 struct sk_buff *skb;
sjur.brandeland@stericsson.com0e4c7d82011-12-04 11:22:54 +0000170 struct netdev_queue *txq;
171
172 rcu_read_lock_bh();
Sjur Brændeland4dd820c2011-04-11 10:43:51 +0000173
Sjur Braendelandc72dfae2010-03-30 13:56:25 +0000174 skb = cfpkt_tonative(pkt);
175 skb->dev = caifd->netdev;
sjur.brandeland@stericsson.com7c18d222011-11-30 09:22:47 +0000176 skb_reset_network_header(skb);
177 skb->protocol = htons(ETH_P_CAIF);
sjur.brandeland@stericsson.com0e4c7d82011-12-04 11:22:54 +0000178
179 /* Check if we need to handle xoff */
Phil Sutter4676a152015-08-18 10:30:46 +0200180 if (likely(caifd->netdev->priv_flags & IFF_NO_QUEUE))
sjur.brandeland@stericsson.com0e4c7d82011-12-04 11:22:54 +0000181 goto noxoff;
182
183 if (unlikely(caifd->xoff))
184 goto noxoff;
185
186 if (likely(!netif_queue_stopped(caifd->netdev))) {
187 /* If we run with a TX queue, check if the queue is too long*/
188 txq = netdev_get_tx_queue(skb->dev, 0);
189 qlen = qdisc_qlen(rcu_dereference_bh(txq->qdisc));
190
191 if (likely(qlen == 0))
192 goto noxoff;
193
194 high = (caifd->netdev->tx_queue_len * q_high) / 100;
195 if (likely(qlen < high))
196 goto noxoff;
197 }
198
199 /* Hold lock while accessing xoff */
200 spin_lock_bh(&caifd->flow_lock);
201 if (caifd->xoff) {
202 spin_unlock_bh(&caifd->flow_lock);
203 goto noxoff;
204 }
205
206 /*
207 * Handle flow off, we do this by temporary hi-jacking this
208 * skb's destructor function, and replace it with our own
209 * flow-on callback. The callback will set flow-on and call
210 * the original destructor.
211 */
212
213 pr_debug("queue has stopped(%d) or is full (%d > %d)\n",
214 netif_queue_stopped(caifd->netdev),
215 qlen, high);
216 caifd->xoff = 1;
sjur.brandeland@stericsson.com7d311302011-12-04 11:22:55 +0000217 caifd->xoff_skb = skb;
218 caifd->xoff_skb_dtor = skb->destructor;
219 skb->destructor = caif_flow_cb;
sjur.brandeland@stericsson.com0e4c7d82011-12-04 11:22:54 +0000220 spin_unlock_bh(&caifd->flow_lock);
sjur.brandeland@stericsson.com0e4c7d82011-12-04 11:22:54 +0000221
222 caifd->layer.up->ctrlcmd(caifd->layer.up,
223 _CAIF_CTRLCMD_PHYIF_FLOW_OFF_IND,
224 caifd->layer.id);
225noxoff:
226 rcu_read_unlock_bh();
Sjur Braendelandc72dfae2010-03-30 13:56:25 +0000227
sjur.brandeland@stericsson.comc85c2952011-05-13 02:44:06 +0000228 err = dev_queue_xmit(skb);
229 if (err > 0)
230 err = -EIO;
Sjur Braendelandc72dfae2010-03-30 13:56:25 +0000231
sjur.brandeland@stericsson.comc85c2952011-05-13 02:44:06 +0000232 return err;
Sjur Braendelandc72dfae2010-03-30 13:56:25 +0000233}
234
Sjur Braendelandc72dfae2010-03-30 13:56:25 +0000235/*
sjur.brandeland@stericsson.combd30ce42011-05-13 02:44:00 +0000236 * Stuff received packets into the CAIF stack.
Sjur Braendelandc72dfae2010-03-30 13:56:25 +0000237 * On error, returns non-zero and releases the skb.
238 */
239static int receive(struct sk_buff *skb, struct net_device *dev,
240 struct packet_type *pkttype, struct net_device *orig_dev)
241{
Sjur Braendelandc72dfae2010-03-30 13:56:25 +0000242 struct cfpkt *pkt;
243 struct caif_device_entry *caifd;
sjur.brandeland@stericsson.com69c867c92011-05-22 11:18:54 +0000244 int err;
sjur.brandeland@stericsson.combd30ce42011-05-13 02:44:00 +0000245
Sjur Braendelandc72dfae2010-03-30 13:56:25 +0000246 pkt = cfpkt_fromnative(CAIF_DIR_IN, skb);
sjur.brandeland@stericsson.combd30ce42011-05-13 02:44:00 +0000247
248 rcu_read_lock();
Sjur Braendelandc72dfae2010-03-30 13:56:25 +0000249 caifd = caif_get(dev);
Sjur Braendelandc72dfae2010-03-30 13:56:25 +0000250
sjur.brandeland@stericsson.combd30ce42011-05-13 02:44:00 +0000251 if (!caifd || !caifd->layer.up || !caifd->layer.up->receive ||
252 !netif_oper_up(caifd->netdev)) {
253 rcu_read_unlock();
254 kfree_skb(skb);
Sjur Braendelandc72dfae2010-03-30 13:56:25 +0000255 return NET_RX_DROP;
sjur.brandeland@stericsson.combd30ce42011-05-13 02:44:00 +0000256 }
Sjur Braendelandc72dfae2010-03-30 13:56:25 +0000257
sjur.brandeland@stericsson.combd30ce42011-05-13 02:44:00 +0000258 /* Hold reference to netdevice while using CAIF stack */
259 caifd_hold(caifd);
260 rcu_read_unlock();
261
sjur.brandeland@stericsson.com69c867c92011-05-22 11:18:54 +0000262 err = caifd->layer.up->receive(caifd->layer.up, pkt);
263
264 /* For -EILSEQ the packet is not freed so so it now */
265 if (err == -EILSEQ)
266 cfpkt_destroy(pkt);
sjur.brandeland@stericsson.combd30ce42011-05-13 02:44:00 +0000267
268 /* Release reference to stack upwards */
269 caifd_put(caifd);
sjur.brandeland@stericsson.com7c18d222011-11-30 09:22:47 +0000270
271 if (err != 0)
272 err = NET_RX_DROP;
273 return err;
Sjur Braendelandc72dfae2010-03-30 13:56:25 +0000274}
275
276static struct packet_type caif_packet_type __read_mostly = {
277 .type = cpu_to_be16(ETH_P_CAIF),
278 .func = receive,
279};
280
281static void dev_flowctrl(struct net_device *dev, int on)
282{
sjur.brandeland@stericsson.combd30ce42011-05-13 02:44:00 +0000283 struct caif_device_entry *caifd;
284
285 rcu_read_lock();
286
287 caifd = caif_get(dev);
288 if (!caifd || !caifd->layer.up || !caifd->layer.up->ctrlcmd) {
289 rcu_read_unlock();
Sjur Braendelandc72dfae2010-03-30 13:56:25 +0000290 return;
sjur.brandeland@stericsson.combd30ce42011-05-13 02:44:00 +0000291 }
292
293 caifd_hold(caifd);
294 rcu_read_unlock();
Sjur Braendelandc72dfae2010-03-30 13:56:25 +0000295
296 caifd->layer.up->ctrlcmd(caifd->layer.up,
297 on ?
298 _CAIF_CTRLCMD_PHYIF_FLOW_ON_IND :
299 _CAIF_CTRLCMD_PHYIF_FLOW_OFF_IND,
300 caifd->layer.id);
sjur.brandeland@stericsson.combd30ce42011-05-13 02:44:00 +0000301 caifd_put(caifd);
Sjur Braendelandc72dfae2010-03-30 13:56:25 +0000302}
303
sjur.brandeland@stericsson.com7c18d222011-11-30 09:22:47 +0000304void caif_enroll_dev(struct net_device *dev, struct caif_dev_common *caifdev,
Silviu-Mihai Popescu3bffc472013-03-06 19:39:57 +0000305 struct cflayer *link_support, int head_room,
306 struct cflayer **layer,
307 int (**rcv_func)(struct sk_buff *, struct net_device *,
308 struct packet_type *,
309 struct net_device *))
sjur.brandeland@stericsson.com7c18d222011-11-30 09:22:47 +0000310{
311 struct caif_device_entry *caifd;
312 enum cfcnfg_phy_preference pref;
313 struct cfcnfg *cfg = get_cfcnfg(dev_net(dev));
314 struct caif_device_entry_list *caifdevs;
315
316 caifdevs = caif_device_list(dev_net(dev));
sjur.brandeland@stericsson.com7c18d222011-11-30 09:22:47 +0000317 caifd = caif_device_alloc(dev);
318 if (!caifd)
319 return;
320 *layer = &caifd->layer;
sjur.brandeland@stericsson.com0e4c7d82011-12-04 11:22:54 +0000321 spin_lock_init(&caifd->flow_lock);
sjur.brandeland@stericsson.com7c18d222011-11-30 09:22:47 +0000322
323 switch (caifdev->link_select) {
324 case CAIF_LINK_HIGH_BANDW:
325 pref = CFPHYPREF_HIGH_BW;
326 break;
327 case CAIF_LINK_LOW_LATENCY:
328 pref = CFPHYPREF_LOW_LAT;
329 break;
330 default:
331 pref = CFPHYPREF_HIGH_BW;
332 break;
333 }
334 mutex_lock(&caifdevs->lock);
335 list_add_rcu(&caifd->list, &caifdevs->list);
336
337 strncpy(caifd->layer.name, dev->name,
338 sizeof(caifd->layer.name) - 1);
339 caifd->layer.name[sizeof(caifd->layer.name) - 1] = 0;
340 caifd->layer.transmit = transmit;
341 cfcnfg_add_phy_layer(cfg,
342 dev,
343 &caifd->layer,
344 pref,
345 link_support,
346 caifdev->use_fcs,
347 head_room);
348 mutex_unlock(&caifdevs->lock);
349 if (rcv_func)
350 *rcv_func = receive;
351}
sjur.brandeland@stericsson.com7ad65bf2011-12-04 11:22:53 +0000352EXPORT_SYMBOL(caif_enroll_dev);
sjur.brandeland@stericsson.com7c18d222011-11-30 09:22:47 +0000353
Sjur Braendelandc72dfae2010-03-30 13:56:25 +0000354/* notify Caif of device events */
355static int caif_device_notify(struct notifier_block *me, unsigned long what,
Jiri Pirko351638e2013-05-28 01:30:21 +0000356 void *ptr)
Sjur Braendelandc72dfae2010-03-30 13:56:25 +0000357{
Jiri Pirko351638e2013-05-28 01:30:21 +0000358 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
Sjur Braendelandc72dfae2010-03-30 13:56:25 +0000359 struct caif_device_entry *caifd = NULL;
360 struct caif_dev_common *caifdev;
sjur.brandeland@stericsson.combee925d2011-05-13 02:44:05 +0000361 struct cfcnfg *cfg;
sjur.brandeland@stericsson.com7c18d222011-11-30 09:22:47 +0000362 struct cflayer *layer, *link_support;
363 int head_room = 0;
David Woodhouse08613e42011-10-24 21:25:21 +0000364 struct caif_device_entry_list *caifdevs;
Sjur Braendelandc72dfae2010-03-30 13:56:25 +0000365
sjur.brandeland@stericsson.combee925d2011-05-13 02:44:05 +0000366 cfg = get_cfcnfg(dev_net(dev));
sjur.brandeland@stericsson.com7c18d222011-11-30 09:22:47 +0000367 caifdevs = caif_device_list(dev_net(dev));
sjur.brandeland@stericsson.combee925d2011-05-13 02:44:05 +0000368
sjur.brandeland@stericsson.com7c18d222011-11-30 09:22:47 +0000369 caifd = caif_get(dev);
370 if (caifd == NULL && dev->type != ARPHRD_CAIF)
371 return 0;
David Woodhouse08613e42011-10-24 21:25:21 +0000372
Sjur Braendelandc72dfae2010-03-30 13:56:25 +0000373 switch (what) {
374 case NETDEV_REGISTER:
sjur.brandeland@stericsson.com7c18d222011-11-30 09:22:47 +0000375 if (caifd != NULL)
376 break;
sjur.brandeland@stericsson.combd30ce42011-05-13 02:44:00 +0000377
Sjur Braendelandc72dfae2010-03-30 13:56:25 +0000378 caifdev = netdev_priv(dev);
Sjur Braendelandc72dfae2010-03-30 13:56:25 +0000379
sjur.brandeland@stericsson.com7c18d222011-11-30 09:22:47 +0000380 link_support = NULL;
381 if (caifdev->use_frag) {
382 head_room = 1;
383 link_support = cfserl_create(dev->ifindex,
sjur.brandeland@stericsson.come977b4c2011-11-30 09:22:48 +0000384 caifdev->use_stx);
sjur.brandeland@stericsson.com7c18d222011-11-30 09:22:47 +0000385 if (!link_support) {
386 pr_warn("Out of memory\n");
387 break;
388 }
Sjur Braendelandc72dfae2010-03-30 13:56:25 +0000389 }
sjur.brandeland@stericsson.com7c18d222011-11-30 09:22:47 +0000390 caif_enroll_dev(dev, caifdev, link_support, head_room,
391 &layer, NULL);
392 caifdev->flowctrl = dev_flowctrl;
Sjur Braendelandc72dfae2010-03-30 13:56:25 +0000393 break;
394
sjur.brandeland@stericsson.combd30ce42011-05-13 02:44:00 +0000395 case NETDEV_UP:
396 rcu_read_lock();
397
Sjur Braendelandc72dfae2010-03-30 13:56:25 +0000398 caifd = caif_get(dev);
sjur.brandeland@stericsson.combd30ce42011-05-13 02:44:00 +0000399 if (caifd == NULL) {
400 rcu_read_unlock();
Sjur Braendelandc72dfae2010-03-30 13:56:25 +0000401 break;
sjur.brandeland@stericsson.combd30ce42011-05-13 02:44:00 +0000402 }
Sjur Braendelandc72dfae2010-03-30 13:56:25 +0000403
sjur.brandeland@stericsson.com0e4c7d82011-12-04 11:22:54 +0000404 caifd->xoff = 0;
sjur.brandeland@stericsson.combd30ce42011-05-13 02:44:00 +0000405 cfcnfg_set_phy_state(cfg, &caifd->layer, true);
406 rcu_read_unlock();
Sjur Braendelandc72dfae2010-03-30 13:56:25 +0000407
Sjur Braendelandc72dfae2010-03-30 13:56:25 +0000408 break;
409
410 case NETDEV_DOWN:
sjur.brandeland@stericsson.combd30ce42011-05-13 02:44:00 +0000411 rcu_read_lock();
412
Sjur Braendelandc72dfae2010-03-30 13:56:25 +0000413 caifd = caif_get(dev);
sjur.brandeland@stericsson.combd30ce42011-05-13 02:44:00 +0000414 if (!caifd || !caifd->layer.up || !caifd->layer.up->ctrlcmd) {
415 rcu_read_unlock();
416 return -EINVAL;
417 }
418
419 cfcnfg_set_phy_state(cfg, &caifd->layer, false);
420 caifd_hold(caifd);
421 rcu_read_unlock();
422
423 caifd->layer.up->ctrlcmd(caifd->layer.up,
424 _CAIF_CTRLCMD_PHYIF_DOWN_IND,
425 caifd->layer.id);
sjur.brandeland@stericsson.com7d311302011-12-04 11:22:55 +0000426
427 spin_lock_bh(&caifd->flow_lock);
428
429 /*
430 * Replace our xoff-destructor with original destructor.
431 * We trust that skb->destructor *always* is called before
432 * the skb reference is invalid. The hijacked SKB destructor
433 * takes the flow_lock so manipulating the skb->destructor here
434 * should be safe.
435 */
436 if (caifd->xoff_skb_dtor != NULL && caifd->xoff_skb != NULL)
437 caifd->xoff_skb->destructor = caifd->xoff_skb_dtor;
438
439 caifd->xoff = 0;
440 caifd->xoff_skb_dtor = NULL;
441 caifd->xoff_skb = NULL;
442
443 spin_unlock_bh(&caifd->flow_lock);
sjur.brandeland@stericsson.combd30ce42011-05-13 02:44:00 +0000444 caifd_put(caifd);
Sjur Braendelandc72dfae2010-03-30 13:56:25 +0000445 break;
446
447 case NETDEV_UNREGISTER:
sjur.brandeland@stericsson.combd30ce42011-05-13 02:44:00 +0000448 mutex_lock(&caifdevs->lock);
449
Sjur Braendelandc72dfae2010-03-30 13:56:25 +0000450 caifd = caif_get(dev);
sjur.brandeland@stericsson.combd30ce42011-05-13 02:44:00 +0000451 if (caifd == NULL) {
452 mutex_unlock(&caifdevs->lock);
André Carvalho de Matosf2527ec2010-11-01 11:52:47 +0000453 break;
sjur.brandeland@stericsson.combd30ce42011-05-13 02:44:00 +0000454 }
455 list_del_rcu(&caifd->list);
456
457 /*
458 * NETDEV_UNREGISTER is called repeatedly until all reference
459 * counts for the net-device are released. If references to
460 * caifd is taken, simply ignore NETDEV_UNREGISTER and wait for
461 * the next call to NETDEV_UNREGISTER.
462 *
463 * If any packets are in flight down the CAIF Stack,
464 * cfcnfg_del_phy_layer will return nonzero.
465 * If no packets are in flight, the CAIF Stack associated
466 * with the net-device un-registering is freed.
467 */
468
469 if (caifd_refcnt_read(caifd) != 0 ||
470 cfcnfg_del_phy_layer(cfg, &caifd->layer) != 0) {
471
472 pr_info("Wait for device inuse\n");
473 /* Enrole device if CAIF Stack is still in use */
474 list_add_rcu(&caifd->list, &caifdevs->list);
475 mutex_unlock(&caifdevs->lock);
476 break;
477 }
478
479 synchronize_rcu();
480 dev_put(caifd->netdev);
481 free_percpu(caifd->pcpu_refcnt);
482 kfree(caifd);
483
484 mutex_unlock(&caifdevs->lock);
Sjur Braendelandc72dfae2010-03-30 13:56:25 +0000485 break;
486 }
487 return 0;
488}
489
490static struct notifier_block caif_device_notifier = {
491 .notifier_call = caif_device_notify,
492 .priority = 0,
493};
494
Sjur Braendelandc72dfae2010-03-30 13:56:25 +0000495/* Per-namespace Caif devices handling */
496static int caif_init_net(struct net *net)
497{
498 struct caif_net *caifn = net_generic(net, caif_net_id);
499 INIT_LIST_HEAD(&caifn->caifdevs.list);
sjur.brandeland@stericsson.combd30ce42011-05-13 02:44:00 +0000500 mutex_init(&caifn->caifdevs.lock);
sjur.brandeland@stericsson.combee925d2011-05-13 02:44:05 +0000501
502 caifn->cfg = cfcnfg_create();
Roar Førdef84ea772011-12-06 12:15:44 +0000503 if (!caifn->cfg)
sjur.brandeland@stericsson.combee925d2011-05-13 02:44:05 +0000504 return -ENOMEM;
sjur.brandeland@stericsson.combee925d2011-05-13 02:44:05 +0000505
Sjur Braendelandc72dfae2010-03-30 13:56:25 +0000506 return 0;
507}
508
509static void caif_exit_net(struct net *net)
510{
sjur.brandeland@stericsson.combd30ce42011-05-13 02:44:00 +0000511 struct caif_device_entry *caifd, *tmp;
512 struct caif_device_entry_list *caifdevs =
513 caif_device_list(net);
sjur.brandeland@stericsson.com7c18d222011-11-30 09:22:47 +0000514 struct cfcnfg *cfg = get_cfcnfg(net);
515
Sjur Braendelandc72dfae2010-03-30 13:56:25 +0000516 rtnl_lock();
sjur.brandeland@stericsson.combd30ce42011-05-13 02:44:00 +0000517 mutex_lock(&caifdevs->lock);
518
519 list_for_each_entry_safe(caifd, tmp, &caifdevs->list, list) {
520 int i = 0;
521 list_del_rcu(&caifd->list);
522 cfcnfg_set_phy_state(cfg, &caifd->layer, false);
523
524 while (i < 10 &&
525 (caifd_refcnt_read(caifd) != 0 ||
526 cfcnfg_del_phy_layer(cfg, &caifd->layer) != 0)) {
527
528 pr_info("Wait for device inuse\n");
529 msleep(250);
530 i++;
531 }
532 synchronize_rcu();
533 dev_put(caifd->netdev);
534 free_percpu(caifd->pcpu_refcnt);
535 kfree(caifd);
Sjur Braendelandc72dfae2010-03-30 13:56:25 +0000536 }
sjur.brandeland@stericsson.combee925d2011-05-13 02:44:05 +0000537 cfcnfg_remove(cfg);
sjur.brandeland@stericsson.combd30ce42011-05-13 02:44:00 +0000538
539 mutex_unlock(&caifdevs->lock);
Sjur Braendelandc72dfae2010-03-30 13:56:25 +0000540 rtnl_unlock();
541}
542
543static struct pernet_operations caif_net_ops = {
544 .init = caif_init_net,
545 .exit = caif_exit_net,
546 .id = &caif_net_id,
547 .size = sizeof(struct caif_net),
548};
549
550/* Initialize Caif devices list */
551static int __init caif_device_init(void)
552{
553 int result;
sjur.brandeland@stericsson.combd30ce42011-05-13 02:44:00 +0000554
Eric W. Biederman8a8ee9a2012-01-26 14:04:53 +0000555 result = register_pernet_subsys(&caif_net_ops);
Sjur Braendelandc72dfae2010-03-30 13:56:25 +0000556
sjur.brandeland@stericsson.combee925d2011-05-13 02:44:05 +0000557 if (result)
Sjur Braendelandc72dfae2010-03-30 13:56:25 +0000558 return result;
sjur.brandeland@stericsson.combee925d2011-05-13 02:44:05 +0000559
Sjur Braendelandc72dfae2010-03-30 13:56:25 +0000560 register_netdevice_notifier(&caif_device_notifier);
sjur.brandeland@stericsson.combee925d2011-05-13 02:44:05 +0000561 dev_add_pack(&caif_packet_type);
Sjur Braendelandc72dfae2010-03-30 13:56:25 +0000562
563 return result;
Sjur Braendelandc72dfae2010-03-30 13:56:25 +0000564}
565
566static void __exit caif_device_exit(void)
567{
Sjur Braendelandc72dfae2010-03-30 13:56:25 +0000568 unregister_netdevice_notifier(&caif_device_notifier);
sjur.brandeland@stericsson.combee925d2011-05-13 02:44:05 +0000569 dev_remove_pack(&caif_packet_type);
Sjur Brændeland96f80d12012-07-15 10:10:14 +0000570 unregister_pernet_subsys(&caif_net_ops);
Sjur Braendelandc72dfae2010-03-30 13:56:25 +0000571}
572
573module_init(caif_device_init);
574module_exit(caif_device_exit);