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 void __free_atm_dev(struct atm_dev
*dev
)
52 static struct atm_dev
*__atm_dev_lookup(int number
)
57 list_for_each(p
, &atm_devs
) {
58 dev
= list_entry(p
, struct atm_dev
, dev_list
);
59 if ((dev
->ops
) && (dev
->number
== number
)) {
67 struct atm_dev
*atm_dev_lookup(int number
)
71 spin_lock(&atm_dev_lock
);
72 dev
= __atm_dev_lookup(number
);
73 spin_unlock(&atm_dev_lock
);
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 spin_lock(&atm_dev_lock
);
90 if ((inuse
= __atm_dev_lookup(number
))) {
92 spin_unlock(&atm_dev_lock
);
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);
112 list_add_tail(&dev
->dev_list
, &atm_devs
);
113 spin_unlock(&atm_dev_lock
);
115 if (atm_proc_dev_register(dev
) < 0) {
116 printk(KERN_ERR
"atm_dev_register: "
117 "atm_proc_dev_register failed for dev %s\n",
119 spin_lock(&atm_dev_lock
);
120 list_del(&dev
->dev_list
);
121 spin_unlock(&atm_dev_lock
);
130 void atm_dev_deregister(struct atm_dev
*dev
)
132 unsigned long warning_time
;
134 atm_proc_dev_deregister(dev
);
136 spin_lock(&atm_dev_lock
);
137 list_del(&dev
->dev_list
);
138 spin_unlock(&atm_dev_lock
);
140 warning_time
= jiffies
;
141 while (atomic_read(&dev
->refcnt
) != 1) {
143 if ((jiffies
- warning_time
) > 10 * HZ
) {
144 printk(KERN_EMERG
"atm_dev_deregister: waiting for "
145 "dev %d to become free. Usage count = %d\n",
146 dev
->number
, atomic_read(&dev
->refcnt
));
147 warning_time
= jiffies
;
154 void shutdown_atm_dev(struct atm_dev
*dev
)
156 if (atomic_read(&dev
->refcnt
) > 1) {
157 set_bit(ATM_DF_CLOSE
, &dev
->flags
);
160 if (dev
->ops
->dev_close
)
161 dev
->ops
->dev_close(dev
);
162 atm_dev_deregister(dev
);
166 static void copy_aal_stats(struct k_atm_aal_stats
*from
,
167 struct atm_aal_stats
*to
)
169 #define __HANDLE_ITEM(i) to->i = atomic_read(&from->i)
175 static void subtract_aal_stats(struct k_atm_aal_stats
*from
,
176 struct atm_aal_stats
*to
)
178 #define __HANDLE_ITEM(i) atomic_sub(to->i, &from->i)
184 static int fetch_stats(struct atm_dev
*dev
, struct atm_dev_stats __user
*arg
, int zero
)
186 struct atm_dev_stats tmp
;
189 copy_aal_stats(&dev
->stats
.aal0
, &tmp
.aal0
);
190 copy_aal_stats(&dev
->stats
.aal34
, &tmp
.aal34
);
191 copy_aal_stats(&dev
->stats
.aal5
, &tmp
.aal5
);
193 error
= copy_to_user(arg
, &tmp
, sizeof(tmp
));
194 if (zero
&& !error
) {
195 subtract_aal_stats(&dev
->stats
.aal0
, &tmp
.aal0
);
196 subtract_aal_stats(&dev
->stats
.aal34
, &tmp
.aal34
);
197 subtract_aal_stats(&dev
->stats
.aal5
, &tmp
.aal5
);
199 return error
? -EFAULT
: 0;
203 int atm_dev_ioctl(unsigned int cmd
, void __user
*arg
)
206 int error
, len
, number
, size
= 0;
209 int *tmp_buf
, *tmp_p
;
210 struct atm_iobuf __user
*iobuf
= arg
;
211 struct atmif_sioc __user
*sioc
= arg
;
214 if (get_user(buf
, &iobuf
->buffer
))
216 if (get_user(len
, &iobuf
->length
))
218 spin_lock(&atm_dev_lock
);
219 list_for_each(p
, &atm_devs
)
222 spin_unlock(&atm_dev_lock
);
225 tmp_buf
= kmalloc(size
, GFP_ATOMIC
);
227 spin_unlock(&atm_dev_lock
);
231 list_for_each(p
, &atm_devs
) {
232 dev
= list_entry(p
, struct atm_dev
, dev_list
);
233 *tmp_p
++ = dev
->number
;
235 spin_unlock(&atm_dev_lock
);
236 error
= ((copy_to_user(buf
, tmp_buf
, size
)) ||
237 put_user(size
, &iobuf
->length
))
245 if (get_user(buf
, &sioc
->arg
))
247 if (get_user(len
, &sioc
->length
))
249 if (get_user(number
, &sioc
->number
))
252 if (!(dev
= atm_dev_lookup(number
)))
257 size
= strlen(dev
->type
) + 1;
258 if (copy_to_user(buf
, dev
->type
, size
)) {
265 if (copy_to_user(buf
, dev
->esi
, size
)) {
274 for (i
= 0; i
< ESI_LEN
; i
++)
283 unsigned char esi
[ESI_LEN
];
285 if (!capable(CAP_NET_ADMIN
)) {
289 if (copy_from_user(esi
, buf
, ESI_LEN
)) {
293 memcpy(dev
->esi
, esi
, ESI_LEN
);
298 if (!capable(CAP_NET_ADMIN
)) {
304 size
= sizeof(struct atm_dev_stats
);
305 error
= fetch_stats(dev
, buf
, cmd
== ATM_GETSTATZ
);
310 size
= sizeof(struct atm_cirange
);
311 if (copy_to_user(buf
, &dev
->ci_range
, size
)) {
316 case ATM_GETLINKRATE
:
318 if (copy_to_user(buf
, &dev
->link_rate
, size
)) {
324 if (!capable(CAP_NET_ADMIN
)) {
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
)
344 error
= atm_add_addr(dev
, &addr
);
346 error
= atm_del_addr(dev
, &addr
);
350 error
= atm_get_addr(dev
, buf
, len
);
354 /* may return 0, but later on size == 0 means "don't
356 error
= put_user(size
, &sioc
->length
)
360 if (__ATM_LM_XTRMT((int) (unsigned long) buf
) &&
361 __ATM_LM_XTLOC((int) (unsigned long) buf
) >
362 __ATM_LM_XTRMT((int) (unsigned long) buf
)) {
371 case SONET_SETFRAMING
:
372 if (!capable(CAP_NET_ADMIN
)) {
378 if (!dev
->ops
->ioctl
) {
382 size
= dev
->ops
->ioctl(dev
, cmd
, buf
);
384 error
= (size
== -ENOIOCTLCMD
? -EINVAL
: size
);
390 error
= put_user(size
, &sioc
->length
)
399 static __inline__
void *dev_get_idx(loff_t left
)
403 list_for_each(p
, &atm_devs
) {
407 return (p
!= &atm_devs
) ? p
: NULL
;
410 void *atm_dev_seq_start(struct seq_file
*seq
, loff_t
*pos
)
412 spin_lock(&atm_dev_lock
);
413 return *pos
? dev_get_idx(*pos
) : (void *) 1;
416 void atm_dev_seq_stop(struct seq_file
*seq
, void *v
)
418 spin_unlock(&atm_dev_lock
);
421 void *atm_dev_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
424 v
= (v
== (void *)1) ? atm_devs
.next
: ((struct list_head
*)v
)->next
;
425 return (v
== &atm_devs
) ? NULL
: v
;
429 EXPORT_SYMBOL(atm_dev_register
);
430 EXPORT_SYMBOL(atm_dev_deregister
);
431 EXPORT_SYMBOL(atm_dev_lookup
);
432 EXPORT_SYMBOL(shutdown_atm_dev
);