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/delay.h>
20 #include <net/sock.h> /* for struct sock */
23 #include "resources.h"
28 DEFINE_SPINLOCK(atm_dev_lock);
30 static struct atm_dev *__alloc_atm_dev(const char *type)
34 dev = kmalloc(sizeof(*dev), GFP_KERNEL);
37 memset(dev, 0, sizeof(*dev));
39 dev->signal = ATM_PHY_SIG_UNKNOWN;
40 dev->link_rate = ATM_OC3_PCR;
41 spin_lock_init(&dev->lock);
42 INIT_LIST_HEAD(&dev->local);
47 static struct atm_dev *__atm_dev_lookup(int number)
52 list_for_each(p, &atm_devs) {
53 dev = list_entry(p, struct atm_dev, dev_list);
54 if ((dev->ops) && (dev->number == number)) {
62 struct atm_dev *atm_dev_lookup(int number)
66 spin_lock(&atm_dev_lock);
67 dev = __atm_dev_lookup(number);
68 spin_unlock(&atm_dev_lock);
72 struct atm_dev *atm_dev_register(const char *type, const struct atmdev_ops *ops,
73 int number, unsigned long *flags)
75 struct atm_dev *dev, *inuse;
77 dev = __alloc_atm_dev(type);
79 printk(KERN_ERR "atm_dev_register: no space for dev %s\n",
83 spin_lock(&atm_dev_lock);
85 if ((inuse = __atm_dev_lookup(number))) {
87 spin_unlock(&atm_dev_lock);
94 while ((inuse = __atm_dev_lookup(dev->number))) {
104 memset(&dev->flags, 0, sizeof(dev->flags));
105 memset(&dev->stats, 0, sizeof(dev->stats));
106 atomic_set(&dev->refcnt, 1);
107 list_add_tail(&dev->dev_list, &atm_devs);
108 spin_unlock(&atm_dev_lock);
110 if (atm_proc_dev_register(dev) < 0) {
111 printk(KERN_ERR "atm_dev_register: "
112 "atm_proc_dev_register failed for dev %s\n",
114 spin_lock(&atm_dev_lock);
115 list_del(&dev->dev_list);
116 spin_unlock(&atm_dev_lock);
125 void atm_dev_deregister(struct atm_dev *dev)
127 unsigned long warning_time;
129 atm_proc_dev_deregister(dev);
131 spin_lock(&atm_dev_lock);
132 list_del(&dev->dev_list);
133 spin_unlock(&atm_dev_lock);
135 warning_time = jiffies;
136 while (atomic_read(&dev->refcnt) != 1) {
138 if ((jiffies - warning_time) > 10 * HZ) {
139 printk(KERN_EMERG "atm_dev_deregister: waiting for "
140 "dev %d to become free. Usage count = %d\n",
141 dev->number, atomic_read(&dev->refcnt));
142 warning_time = jiffies;
149 void shutdown_atm_dev(struct atm_dev *dev)
151 if (atomic_read(&dev->refcnt) > 1) {
152 set_bit(ATM_DF_CLOSE, &dev->flags);
155 if (dev->ops->dev_close)
156 dev->ops->dev_close(dev);
157 atm_dev_deregister(dev);
161 static void copy_aal_stats(struct k_atm_aal_stats *from,
162 struct atm_aal_stats *to)
164 #define __HANDLE_ITEM(i) to->i = atomic_read(&from->i)
170 static void subtract_aal_stats(struct k_atm_aal_stats *from,
171 struct atm_aal_stats *to)
173 #define __HANDLE_ITEM(i) atomic_sub(to->i, &from->i)
179 static int fetch_stats(struct atm_dev *dev, struct atm_dev_stats __user *arg, int zero)
181 struct atm_dev_stats tmp;
184 copy_aal_stats(&dev->stats.aal0, &tmp.aal0);
185 copy_aal_stats(&dev->stats.aal34, &tmp.aal34);
186 copy_aal_stats(&dev->stats.aal5, &tmp.aal5);
188 error = copy_to_user(arg, &tmp, sizeof(tmp));
189 if (zero && !error) {
190 subtract_aal_stats(&dev->stats.aal0, &tmp.aal0);
191 subtract_aal_stats(&dev->stats.aal34, &tmp.aal34);
192 subtract_aal_stats(&dev->stats.aal5, &tmp.aal5);
194 return error ? -EFAULT : 0;
198 int atm_dev_ioctl(unsigned int cmd, void __user *arg)
201 int error, len, number, size = 0;
204 int *tmp_buf, *tmp_p;
205 struct atm_iobuf __user *iobuf = arg;
206 struct atmif_sioc __user *sioc = arg;
209 if (get_user(buf, &iobuf->buffer))
211 if (get_user(len, &iobuf->length))
213 spin_lock(&atm_dev_lock);
214 list_for_each(p, &atm_devs)
217 spin_unlock(&atm_dev_lock);
220 tmp_buf = kmalloc(size, GFP_ATOMIC);
222 spin_unlock(&atm_dev_lock);
226 list_for_each(p, &atm_devs) {
227 dev = list_entry(p, struct atm_dev, dev_list);
228 *tmp_p++ = dev->number;
230 spin_unlock(&atm_dev_lock);
231 error = ((copy_to_user(buf, tmp_buf, size)) ||
232 put_user(size, &iobuf->length))
240 if (get_user(buf, &sioc->arg))
242 if (get_user(len, &sioc->length))
244 if (get_user(number, &sioc->number))
247 if (!(dev = atm_dev_lookup(number)))
252 size = strlen(dev->type) + 1;
253 if (copy_to_user(buf, dev->type, size)) {
260 if (copy_to_user(buf, dev->esi, size)) {
269 for (i = 0; i < ESI_LEN; i++)
278 unsigned char esi[ESI_LEN];
280 if (!capable(CAP_NET_ADMIN)) {
284 if (copy_from_user(esi, buf, ESI_LEN)) {
288 memcpy(dev->esi, esi, ESI_LEN);
293 if (!capable(CAP_NET_ADMIN)) {
299 size = sizeof(struct atm_dev_stats);
300 error = fetch_stats(dev, buf, cmd == ATM_GETSTATZ);
305 size = sizeof(struct atm_cirange);
306 if (copy_to_user(buf, &dev->ci_range, size)) {
311 case ATM_GETLINKRATE:
313 if (copy_to_user(buf, &dev->link_rate, size)) {
319 if (!capable(CAP_NET_ADMIN)) {
327 if (!capable(CAP_NET_ADMIN)) {
332 struct sockaddr_atmsvc addr;
334 if (copy_from_user(&addr, buf, sizeof(addr))) {
338 if (cmd == ATM_ADDADDR)
339 error = atm_add_addr(dev, &addr);
341 error = atm_del_addr(dev, &addr);
345 error = atm_get_addr(dev, buf, len);
349 /* may return 0, but later on size == 0 means "don't
351 error = put_user(size, &sioc->length)
355 if (__ATM_LM_XTRMT((int) (unsigned long) buf) &&
356 __ATM_LM_XTLOC((int) (unsigned long) buf) >
357 __ATM_LM_XTRMT((int) (unsigned long) buf)) {
366 case SONET_SETFRAMING:
367 if (!capable(CAP_NET_ADMIN)) {
373 if (!dev->ops->ioctl) {
377 size = dev->ops->ioctl(dev, cmd, buf);
379 error = (size == -ENOIOCTLCMD ? -EINVAL : size);
385 error = put_user(size, &sioc->length)
394 static __inline__ void *dev_get_idx(loff_t left)
398 list_for_each(p, &atm_devs) {
402 return (p != &atm_devs) ? p : NULL;
405 void *atm_dev_seq_start(struct seq_file *seq, loff_t *pos)
407 spin_lock(&atm_dev_lock);
408 return *pos ? dev_get_idx(*pos) : (void *) 1;
411 void atm_dev_seq_stop(struct seq_file *seq, void *v)
413 spin_unlock(&atm_dev_lock);
416 void *atm_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
419 v = (v == (void *)1) ? atm_devs.next : ((struct list_head *)v)->next;
420 return (v == &atm_devs) ? NULL : v;
424 EXPORT_SYMBOL(atm_dev_register);
425 EXPORT_SYMBOL(atm_dev_deregister);
426 EXPORT_SYMBOL(atm_dev_lookup);
427 EXPORT_SYMBOL(shutdown_atm_dev);