1 /* net/atm/resources.c - Statically allocated resources */
3 /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
6 * Arnaldo Carvalho de Melo <acme@conectiva.com.br>
7 * 2002/01 - don't free the whole struct sock on sk->destruct time,
8 * use the default destruct function initialized by sock_init_data */
11 #include <linux/config.h>
12 #include <linux/ctype.h>
13 #include <linux/string.h>
14 #include <linux/atmdev.h>
15 #include <linux/sonet.h>
16 #include <linux/kernel.h> /* for barrier */
17 #include <linux/module.h>
18 #include <linux/bitops.h>
19 #include <linux/capability.h>
20 #include <linux/delay.h>
21 #include <linux/mutex.h>
23 #include <net/sock.h> /* for struct sock */
26 #include "resources.h"
31 DEFINE_MUTEX(atm_dev_mutex);
33 static struct atm_dev *__alloc_atm_dev(const char *type)
37 dev = kmalloc(sizeof(*dev), GFP_KERNEL);
40 memset(dev, 0, sizeof(*dev));
42 dev->signal = ATM_PHY_SIG_UNKNOWN;
43 dev->link_rate = ATM_OC3_PCR;
44 spin_lock_init(&dev->lock);
45 INIT_LIST_HEAD(&dev->local);
46 INIT_LIST_HEAD(&dev->lecs);
51 static struct atm_dev *__atm_dev_lookup(int number)
56 list_for_each(p, &atm_devs) {
57 dev = list_entry(p, struct atm_dev, dev_list);
58 if (dev->number == number) {
66 struct atm_dev *atm_dev_lookup(int number)
70 mutex_lock(&atm_dev_mutex);
71 dev = __atm_dev_lookup(number);
72 mutex_unlock(&atm_dev_mutex);
77 struct atm_dev *atm_dev_register(const char *type, const struct atmdev_ops *ops,
78 int number, unsigned long *flags)
80 struct atm_dev *dev, *inuse;
82 dev = __alloc_atm_dev(type);
84 printk(KERN_ERR "atm_dev_register: no space for dev %s\n",
88 mutex_lock(&atm_dev_mutex);
90 if ((inuse = __atm_dev_lookup(number))) {
92 mutex_unlock(&atm_dev_mutex);
99 while ((inuse = __atm_dev_lookup(dev->number))) {
109 memset(&dev->flags, 0, sizeof(dev->flags));
110 memset(&dev->stats, 0, sizeof(dev->stats));
111 atomic_set(&dev->refcnt, 1);
113 if (atm_proc_dev_register(dev) < 0) {
114 printk(KERN_ERR "atm_dev_register: "
115 "atm_proc_dev_register failed for dev %s\n",
120 if (atm_register_sysfs(dev) < 0) {
121 printk(KERN_ERR "atm_dev_register: "
122 "atm_register_sysfs failed for dev %s\n",
124 atm_proc_dev_deregister(dev);
128 list_add_tail(&dev->dev_list, &atm_devs);
131 mutex_unlock(&atm_dev_mutex);
141 void atm_dev_deregister(struct atm_dev *dev)
143 BUG_ON(test_bit(ATM_DF_REMOVED, &dev->flags));
144 set_bit(ATM_DF_REMOVED, &dev->flags);
147 * if we remove current device from atm_devs list, new device
148 * with same number can appear, such we need deregister proc,
149 * release async all vccs and remove them from vccs list too
151 mutex_lock(&atm_dev_mutex);
152 list_del(&dev->dev_list);
153 mutex_unlock(&atm_dev_mutex);
155 atm_dev_release_vccs(dev);
156 atm_unregister_sysfs(dev);
157 atm_proc_dev_deregister(dev);
163 static void copy_aal_stats(struct k_atm_aal_stats *from,
164 struct atm_aal_stats *to)
166 #define __HANDLE_ITEM(i) to->i = atomic_read(&from->i)
172 static void subtract_aal_stats(struct k_atm_aal_stats *from,
173 struct atm_aal_stats *to)
175 #define __HANDLE_ITEM(i) atomic_sub(to->i, &from->i)
181 static int fetch_stats(struct atm_dev *dev, struct atm_dev_stats __user *arg, int zero)
183 struct atm_dev_stats tmp;
186 copy_aal_stats(&dev->stats.aal0, &tmp.aal0);
187 copy_aal_stats(&dev->stats.aal34, &tmp.aal34);
188 copy_aal_stats(&dev->stats.aal5, &tmp.aal5);
190 error = copy_to_user(arg, &tmp, sizeof(tmp));
191 if (zero && !error) {
192 subtract_aal_stats(&dev->stats.aal0, &tmp.aal0);
193 subtract_aal_stats(&dev->stats.aal34, &tmp.aal34);
194 subtract_aal_stats(&dev->stats.aal5, &tmp.aal5);
196 return error ? -EFAULT : 0;
200 int atm_dev_ioctl(unsigned int cmd, void __user *arg)
203 int error, len, number, size = 0;
206 int *tmp_buf, *tmp_p;
207 struct atm_iobuf __user *iobuf = arg;
208 struct atmif_sioc __user *sioc = arg;
211 if (get_user(buf, &iobuf->buffer))
213 if (get_user(len, &iobuf->length))
215 mutex_lock(&atm_dev_mutex);
216 list_for_each(p, &atm_devs)
219 mutex_unlock(&atm_dev_mutex);
222 tmp_buf = kmalloc(size, GFP_ATOMIC);
224 mutex_unlock(&atm_dev_mutex);
228 list_for_each(p, &atm_devs) {
229 dev = list_entry(p, struct atm_dev, dev_list);
230 *tmp_p++ = dev->number;
232 mutex_unlock(&atm_dev_mutex);
233 error = ((copy_to_user(buf, tmp_buf, size)) ||
234 put_user(size, &iobuf->length))
242 if (get_user(buf, &sioc->arg))
244 if (get_user(len, &sioc->length))
246 if (get_user(number, &sioc->number))
249 if (!(dev = try_then_request_module(atm_dev_lookup(number),
250 "atm-device-%d", number)))
255 size = strlen(dev->type) + 1;
256 if (copy_to_user(buf, dev->type, size)) {
263 if (copy_to_user(buf, dev->esi, size)) {
272 for (i = 0; i < ESI_LEN; i++)
281 unsigned char esi[ESI_LEN];
283 if (!capable(CAP_NET_ADMIN)) {
287 if (copy_from_user(esi, buf, ESI_LEN)) {
291 memcpy(dev->esi, esi, ESI_LEN);
296 if (!capable(CAP_NET_ADMIN)) {
302 size = sizeof(struct atm_dev_stats);
303 error = fetch_stats(dev, buf, cmd == ATM_GETSTATZ);
308 size = sizeof(struct atm_cirange);
309 if (copy_to_user(buf, &dev->ci_range, size)) {
314 case ATM_GETLINKRATE:
316 if (copy_to_user(buf, &dev->link_rate, size)) {
322 if (!capable(CAP_NET_ADMIN)) {
326 atm_reset_addr(dev, ATM_ADDR_LOCAL);
330 case ATM_ADDLECSADDR:
331 case ATM_DELLECSADDR:
332 if (!capable(CAP_NET_ADMIN)) {
337 struct sockaddr_atmsvc addr;
339 if (copy_from_user(&addr, buf, sizeof(addr))) {
343 if (cmd == ATM_ADDADDR || cmd == ATM_ADDLECSADDR)
344 error = atm_add_addr(dev, &addr,
345 (cmd == ATM_ADDADDR ?
346 ATM_ADDR_LOCAL : ATM_ADDR_LECS));
348 error = atm_del_addr(dev, &addr,
349 (cmd == ATM_DELADDR ?
350 ATM_ADDR_LOCAL : ATM_ADDR_LECS));
354 case ATM_GETLECSADDR:
355 error = atm_get_addr(dev, buf, len,
356 (cmd == ATM_GETADDR ?
357 ATM_ADDR_LOCAL : ATM_ADDR_LECS));
361 /* may return 0, but later on size == 0 means "don't
363 error = put_user(size, &sioc->length)
367 if (__ATM_LM_XTRMT((int) (unsigned long) buf) &&
368 __ATM_LM_XTLOC((int) (unsigned long) buf) >
369 __ATM_LM_XTRMT((int) (unsigned long) buf)) {
378 case SONET_SETFRAMING:
379 if (!capable(CAP_NET_ADMIN)) {
385 if (!dev->ops->ioctl) {
389 size = dev->ops->ioctl(dev, cmd, buf);
391 error = (size == -ENOIOCTLCMD ? -EINVAL : size);
397 error = put_user(size, &sioc->length)
406 static __inline__ void *dev_get_idx(loff_t left)
410 list_for_each(p, &atm_devs) {
414 return (p != &atm_devs) ? p : NULL;
417 void *atm_dev_seq_start(struct seq_file *seq, loff_t *pos)
419 mutex_lock(&atm_dev_mutex);
420 return *pos ? dev_get_idx(*pos) : (void *) 1;
423 void atm_dev_seq_stop(struct seq_file *seq, void *v)
425 mutex_unlock(&atm_dev_mutex);
428 void *atm_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
431 v = (v == (void *)1) ? atm_devs.next : ((struct list_head *)v)->next;
432 return (v == &atm_devs) ? NULL : v;
436 EXPORT_SYMBOL(atm_dev_register);
437 EXPORT_SYMBOL(atm_dev_deregister);
438 EXPORT_SYMBOL(atm_dev_lookup);