1 #include <linux/types.h>
2 #include <linux/atmmpc.h>
3 #include <linux/time.h>
4
5 #include "mpoa_caches.h"
6 #include "mpc.h"
7
8 /*
9 * mpoa_caches.c: Implementation of ingress and egress cache
10 * handling functions
11 */
12
13 #if 0
14 #define dprintk printk /* debug */
15 #else
16 #define dprintk(format,args...)
17 #endif
18
19 #if 0
20 #define ddprintk printk /* more debug */
21 #else
22 #define ddprintk(format,args...)
23 #endif
24
25 static in_cache_entry *in_cache_get(uint32_t dst_ip,
26 struct mpoa_client *client)
27 {
28 in_cache_entry *entry;
29
30 read_lock_bh(&client->ingress_lock);
31 entry = client->in_cache;
32 while(entry != NULL){
33 if( entry->ctrl_info.in_dst_ip == dst_ip ){
34 atomic_inc(&entry->use);
35 read_unlock_bh(&client->ingress_lock);
36 return entry;
37 }
38 entry = entry->next;
39 }
40 read_unlock_bh(&client->ingress_lock);
41
42 return NULL;
43 }
44
45 static in_cache_entry *in_cache_get_with_mask(uint32_t dst_ip,
46 struct mpoa_client *client,
47 uint32_t mask)
48 {
49 in_cache_entry *entry;
50
51 read_lock_bh(&client->ingress_lock);
52 entry = client->in_cache;
53 while(entry != NULL){
54 if((entry->ctrl_info.in_dst_ip & mask) == (dst_ip & mask )){
55 atomic_inc(&entry->use);
56 read_unlock_bh(&client->ingress_lock);
57 return entry;
58 }
59 entry = entry->next;
60 }
61 read_unlock_bh(&client->ingress_lock);
62
63 return NULL;
64
65 }
66
67 static in_cache_entry *in_cache_get_by_vcc(struct atm_vcc *vcc,
68 struct mpoa_client *client )
69 {
70 in_cache_entry *entry;
71
72 read_lock_bh(&client->ingress_lock);
73 entry = client->in_cache;
74 while(entry != NULL){
75 if(entry->shortcut == vcc) {
76 atomic_inc(&entry->use);
77 read_unlock_bh(&client->ingress_lock);
78 return entry;
79 }
80 entry = entry->next;
81 }
82 read_unlock_bh(&client->ingress_lock);
83
84 return NULL;
85 }
86
87 static in_cache_entry *in_cache_add_entry(uint32_t dst_ip,
88 struct mpoa_client *client)
89 {
90 unsigned char *ip __attribute__ ((unused)) = (unsigned char *)&dst_ip;
91 in_cache_entry* entry = kmalloc(sizeof(in_cache_entry), GFP_KERNEL);
92
93 if (entry == NULL) {
94 printk("mpoa: mpoa_caches.c: new_in_cache_entry: out of memory\n");
95 return NULL;
96 }
97
98 dprintk("mpoa: mpoa_caches.c: adding an ingress entry, ip = %u.%u.%u.%u\n", ip[0], ip[1], ip[2], ip[3]);
99 memset(entry,0,sizeof(in_cache_entry));
100
101 atomic_set(&entry->use, 1);
102 dprintk("mpoa: mpoa_caches.c: new_in_cache_entry: about to lock\n");
103 write_lock_bh(&client->ingress_lock);
104 entry->next = client->in_cache;
105 entry->prev = NULL;
106 if (client->in_cache != NULL)
107 client->in_cache->prev = entry;
108 client->in_cache = entry;
109
110 memcpy(entry->MPS_ctrl_ATM_addr, client->mps_ctrl_addr, ATM_ESA_LEN);
111 entry->ctrl_info.in_dst_ip = dst_ip;
112 do_gettimeofday(&(entry->tv));
113 entry->retry_time = client->parameters.mpc_p4;
114 entry->count = 1;
115 entry->entry_state = INGRESS_INVALID;
116 entry->ctrl_info.holding_time = HOLDING_TIME_DEFAULT;
117 atomic_inc(&entry->use);
118
119 write_unlock_bh(&client->ingress_lock);
120 dprintk("mpoa: mpoa_caches.c: new_in_cache_entry: unlocked\n");
121
122 return entry;
123 }
124
125 static int cache_hit(in_cache_entry *entry, struct mpoa_client *mpc)
126 {
127 struct atm_mpoa_qos *qos;
128 struct k_message msg;
129
130 entry->count++;
131 if(entry->entry_state == INGRESS_RESOLVED && entry->shortcut != NULL)
132 return OPEN;
133
134 if(entry->entry_state == INGRESS_REFRESHING){
135 if(entry->count > mpc->parameters.mpc_p1){
136 msg.type = SND_MPOA_RES_RQST;
137 msg.content.in_info = entry->ctrl_info;
138 memcpy(msg.MPS_ctrl, mpc->mps_ctrl_addr, ATM_ESA_LEN);
139 qos = atm_mpoa_search_qos(entry->ctrl_info.in_dst_ip);
140 if (qos != NULL) msg.qos = qos->qos;
141 msg_to_mpoad(&msg, mpc);
142 do_gettimeofday(&(entry->reply_wait));
143 entry->entry_state = INGRESS_RESOLVING;
144 }
145 if(entry->shortcut != NULL)
146 return OPEN;
147 return CLOSED;
148 }
149
150 if(entry->entry_state == INGRESS_RESOLVING && entry->shortcut != NULL)
151 return OPEN;
152
153 if( entry->count > mpc->parameters.mpc_p1 &&
154 entry->entry_state == INGRESS_INVALID){
155 unsigned char *ip __attribute__ ((unused)) =
156 (unsigned char *)&entry->ctrl_info.in_dst_ip;
157
158 dprintk("mpoa: (%s) mpoa_caches.c: threshold exceeded for ip %u.%u.%u.%u, sending MPOA res req\n", mpc->dev->name, ip[0], ip[1], ip[2], ip[3]);
159 entry->entry_state = INGRESS_RESOLVING;
160 msg.type = SND_MPOA_RES_RQST;
161 memcpy(msg.MPS_ctrl, mpc->mps_ctrl_addr, ATM_ESA_LEN );
162 msg.content.in_info = entry->ctrl_info;
163 qos = atm_mpoa_search_qos(entry->ctrl_info.in_dst_ip);
164 if (qos != NULL) msg.qos = qos->qos;
165 msg_to_mpoad( &msg, mpc);
166 do_gettimeofday(&(entry->reply_wait));
167 }
168
169 return CLOSED;
170 }
171
172 static void in_cache_put(in_cache_entry *entry)
173 {
174 if (atomic_dec_and_test(&entry->use)) {
175 memset(entry, 0, sizeof(in_cache_entry));
176 kfree(entry);
177 }
178
179 return;
180 }
181
182 /*
183 * This should be called with write lock on
184 */
185 static void in_cache_remove_entry(in_cache_entry *entry,
186 struct mpoa_client *client)
187 {
188 struct atm_vcc *vcc;
189 struct k_message msg;
190 unsigned char *ip;
191
192 vcc = entry->shortcut;
193 ip = (unsigned char *)&entry->ctrl_info.in_dst_ip;
194 dprintk("mpoa: mpoa_caches.c: removing an ingress entry, ip = %u.%u.%u.%u\n",ip[0], ip[1], ip[2], ip[3]);
195
196 if (entry->prev != NULL)
197 entry->prev->next = entry->next;
198 else
199 client->in_cache = entry->next;
200 if (entry->next != NULL)
201 entry->next->prev = entry->prev;
202 client->in_ops->put(entry);
203 if(client->in_cache == NULL && client->eg_cache == NULL){
204 msg.type = STOP_KEEP_ALIVE_SM;
205 msg_to_mpoad(&msg,client);
206 }
207
208 /* Check if the egress side still uses this VCC */
209 if (vcc != NULL) {
210 eg_cache_entry *eg_entry = client->eg_ops->get_by_vcc(vcc, client);
211 if (eg_entry != NULL) {
212 client->eg_ops->put(eg_entry);
213 return;
214 }
215 vcc_release_async(vcc, -EPIPE);
216 }
217
218 return;
219 }
220
221
222 /* Call this every MPC-p2 seconds... Not exactly correct solution,
223 but an easy one... */
224 static void clear_count_and_expired(struct mpoa_client *client)
225 {
226 unsigned char *ip;
227 in_cache_entry *entry, *next_entry;
228 struct timeval now;
229
230 do_gettimeofday(&now);
231
232 write_lock_bh(&client->ingress_lock);
233 entry = client->in_cache;
234 while(entry != NULL){
235 entry->count=0;
236 next_entry = entry->next;
237 if((now.tv_sec - entry->tv.tv_sec)
238 > entry->ctrl_info.holding_time){
239 ip = (unsigned char*)&entry->ctrl_info.in_dst_ip;
240 dprintk("mpoa: mpoa_caches.c: holding time expired, ip = %u.%u.%u.%u\n", NIPQUAD(ip));
241 client->in_ops->remove_entry(entry, client);
242 }
243 entry = next_entry;
244 }
245 write_unlock_bh(&client->ingress_lock);
246
247 return;
248 }
249
250 /* Call this every MPC-p4 seconds. */
251 static void check_resolving_entries(struct mpoa_client *client)
252 {
253
254 struct atm_mpoa_qos *qos;
255 in_cache_entry *entry;
256 struct timeval now;
257 struct k_message msg;
258
259 do_gettimeofday( &now );
260
261 read_lock_bh(&client->ingress_lock);
262 entry = client->in_cache;
263 while( entry != NULL ){
264 if(entry->entry_state == INGRESS_RESOLVING){
265 if(now.tv_sec - entry->hold_down.tv_sec < client->parameters.mpc_p6){
266 entry = entry->next; /* Entry in hold down */
267 continue;
268 }
269 if( (now.tv_sec - entry->reply_wait.tv_sec) >
270 entry->retry_time ){
271 entry->retry_time = MPC_C1*( entry->retry_time );
272 if(entry->retry_time > client->parameters.mpc_p5){
273 /* Retry time maximum exceeded, put entry in hold down. */
274 do_gettimeofday(&(entry->hold_down));
275 entry->retry_time = client->parameters.mpc_p4;
276 entry = entry->next;
277 continue;
278 }
279 /* Ask daemon to send a resolution request. */
280 memset(&(entry->hold_down),0,sizeof(struct timeval));
281 msg.type = SND_MPOA_RES_RTRY;
282 memcpy(msg.MPS_ctrl, client->mps_ctrl_addr, ATM_ESA_LEN);
283 msg.content.in_info = entry->ctrl_info;
284 qos = atm_mpoa_search_qos(entry->ctrl_info.in_dst_ip);
285 if (qos != NULL) msg.qos = qos->qos;
286 msg_to_mpoad(&msg, client);
287 do_gettimeofday(&(entry->reply_wait));
288 }
289 }
290 entry = entry->next;
291 }
292 read_unlock_bh(&client->ingress_lock);
293 }
294
295 /* Call this every MPC-p5 seconds. */
296 static void refresh_entries(struct mpoa_client *client)
297 {
298 struct timeval now;
299 struct in_cache_entry *entry = client->in_cache;
300
301 ddprintk("mpoa: mpoa_caches.c: refresh_entries\n");
302 do_gettimeofday(&now);
303
304 read_lock_bh(&client->ingress_lock);
305 while( entry != NULL ){
306 if( entry->entry_state == INGRESS_RESOLVED ){
307 if(!(entry->refresh_time))
308 entry->refresh_time = (2*(entry->ctrl_info.holding_time))/3;
309 if( (now.tv_sec - entry->reply_wait.tv_sec) > entry->refresh_time ){
310 dprintk("mpoa: mpoa_caches.c: refreshing an entry.\n");
311 entry->entry_state = INGRESS_REFRESHING;
312
313 }
314 }
315 entry = entry->next;
316 }
317 read_unlock_bh(&client->ingress_lock);
318 }
319
320 static void in_destroy_cache(struct mpoa_client *mpc)
321 {
322 write_lock_irq(&mpc->ingress_lock);
323 while(mpc->in_cache != NULL)
324 mpc->in_ops->remove_entry(mpc->in_cache, mpc);
325 write_unlock_irq(&mpc->ingress_lock);
326
327 return;
328 }
329
330 static eg_cache_entry *eg_cache_get_by_cache_id(uint32_t cache_id, struct mpoa_client *mpc)
331 {
332 eg_cache_entry *entry;
333
334 read_lock_irq(&mpc->egress_lock);
335 entry = mpc->eg_cache;
336 while(entry != NULL){
337 if(entry->ctrl_info.cache_id == cache_id){
338 atomic_inc(&entry->use);
339 read_unlock_irq(&mpc->egress_lock);
340 return entry;
341 }
342 entry = entry->next;
343 }
344 read_unlock_irq(&mpc->egress_lock);
345
346 return NULL;
347 }
348
349 /* This can be called from any context since it saves CPU flags */
350 static eg_cache_entry *eg_cache_get_by_tag(uint32_t tag, struct mpoa_client *mpc)
351 {
352 unsigned long flags;
353 eg_cache_entry *entry;
354
355 read_lock_irqsave(&mpc->egress_lock, flags);
356 entry = mpc->eg_cache;
357 while (entry != NULL){
358 if (entry->ctrl_info.tag == tag) {
359 atomic_inc(&entry->use);
360 read_unlock_irqrestore(&mpc->egress_lock, flags);
361 return entry;
362 }
363 entry = entry->next;
364 }
365 read_unlock_irqrestore(&mpc->egress_lock, flags);
366
367 return NULL;
368 }
369
370 /* This can be called from any context since it saves CPU flags */
371 static eg_cache_entry *eg_cache_get_by_vcc(struct atm_vcc *vcc, struct mpoa_client *mpc)
372 {
373 unsigned long flags;
374 eg_cache_entry *entry;
375
376 read_lock_irqsave(&mpc->egress_lock, flags);
377 entry = mpc->eg_cache;
378 while (entry != NULL){
379 if (entry->shortcut == vcc) {
380 atomic_inc(&entry->use);
381 read_unlock_irqrestore(&mpc->egress_lock, flags);
382 return entry;
383 }
384 entry = entry->next;
385 }
386 read_unlock_irqrestore(&mpc->egress_lock, flags);
387
388 return NULL;
389 }
390
391 static eg_cache_entry *eg_cache_get_by_src_ip(uint32_t ipaddr, struct mpoa_client *mpc)
392 {
393 eg_cache_entry *entry;
394
395 read_lock_irq(&mpc->egress_lock);
396 entry = mpc->eg_cache;
397 while(entry != NULL){
398 if(entry->latest_ip_addr == ipaddr) {
399 atomic_inc(&entry->use);
400 read_unlock_irq(&mpc->egress_lock);
401 return entry;
402 }
403 entry = entry->next;
404 }
405 read_unlock_irq(&mpc->egress_lock);
406
407 return NULL;
408 }
409
410 static void eg_cache_put(eg_cache_entry *entry)
411 {
412 if (atomic_dec_and_test(&entry->use)) {
413 memset(entry, 0, sizeof(eg_cache_entry));
414 kfree(entry);
415 }
416
417 return;
418 }
419
420 /*
421 * This should be called with write lock on
422 */
423 static void eg_cache_remove_entry(eg_cache_entry *entry,
424 struct mpoa_client *client)
425 {
426 struct atm_vcc *vcc;
427 struct k_message msg;
428
429 vcc = entry->shortcut;
430 dprintk("mpoa: mpoa_caches.c: removing an egress entry.\n");
431 if (entry->prev != NULL)
432 entry->prev->next = entry->next;
433 else
434 client->eg_cache = entry->next;
435 if (entry->next != NULL)
436 entry->next->prev = entry->prev;
437 client->eg_ops->put(entry);
438 if(client->in_cache == NULL && client->eg_cache == NULL){
439 msg.type = STOP_KEEP_ALIVE_SM;
440 msg_to_mpoad(&msg,client);
441 }
442
443 /* Check if the ingress side still uses this VCC */
444 if (vcc != NULL) {
445 in_cache_entry *in_entry = client->in_ops->get_by_vcc(vcc, client);
446 if (in_entry != NULL) {
447 client->in_ops->put(in_entry);
448 return;
449 }
450 vcc_release_async(vcc, -EPIPE);
451 }
452
453 return;
454 }
455
456 static eg_cache_entry *eg_cache_add_entry(struct k_message *msg, struct mpoa_client *client)
457 {
458 unsigned char *ip;
459 eg_cache_entry *entry = kmalloc(sizeof(eg_cache_entry), GFP_KERNEL);
460
461 if (entry == NULL) {
462 printk("mpoa: mpoa_caches.c: new_eg_cache_entry: out of memory\n");
463 return NULL;
464 }
465
466 ip = (unsigned char *)&msg->content.eg_info.eg_dst_ip;
467 dprintk("mpoa: mpoa_caches.c: adding an egress entry, ip = %u.%u.%u.%u, this should be our IP\n", NIPQUAD(ip));
468 memset(entry, 0, sizeof(eg_cache_entry));
469
470 atomic_set(&entry->use, 1);
471 dprintk("mpoa: mpoa_caches.c: new_eg_cache_entry: about to lock\n");
472 write_lock_irq(&client->egress_lock);
473 entry->next = client->eg_cache;
474 entry->prev = NULL;
475 if (client->eg_cache != NULL)
476 client->eg_cache->prev = entry;
477 client->eg_cache = entry;
478
479 memcpy(entry->MPS_ctrl_ATM_addr, client->mps_ctrl_addr, ATM_ESA_LEN);
480 entry->ctrl_info = msg->content.eg_info;
481 do_gettimeofday(&(entry->tv));
482 entry->entry_state = EGRESS_RESOLVED;
483 dprintk("mpoa: mpoa_caches.c: new_eg_cache_entry cache_id %lu\n", ntohl(entry->ctrl_info.cache_id));
484 ip = (unsigned char *)&entry->ctrl_info.mps_ip;
485 dprintk("mpoa: mpoa_caches.c: mps_ip = %u.%u.%u.%u\n", NIPQUAD(ip));
486 atomic_inc(&entry->use);
487
488 write_unlock_irq(&client->egress_lock);
489 dprintk("mpoa: mpoa_caches.c: new_eg_cache_entry: unlocked\n");
490
491 return entry;
492 }
493
494 static void update_eg_cache_entry(eg_cache_entry * entry, uint16_t holding_time)
495 {
496 do_gettimeofday(&(entry->tv));
497 entry->entry_state = EGRESS_RESOLVED;
498 entry->ctrl_info.holding_time = holding_time;
499
500 return;
501 }
502
503 static void clear_expired(struct mpoa_client *client)
504 {
505 eg_cache_entry *entry, *next_entry;
506 struct timeval now;
507 struct k_message msg;
508
509 do_gettimeofday(&now);
510
511 write_lock_irq(&client->egress_lock);
512 entry = client->eg_cache;
513 while(entry != NULL){
514 next_entry = entry->next;
515 if((now.tv_sec - entry->tv.tv_sec)
516 > entry->ctrl_info.holding_time){
517 msg.type = SND_EGRESS_PURGE;
518 msg.content.eg_info = entry->ctrl_info;
519 dprintk("mpoa: mpoa_caches.c: egress_cache: holding time expired, cache_id = %lu.\n",ntohl(entry->ctrl_info.cache_id));
520 msg_to_mpoad(&msg, client);
521 client->eg_ops->remove_entry(entry, client);
522 }
523 entry = next_entry;
524 }
525 write_unlock_irq(&client->egress_lock);
526
527 return;
528 }
529
530 static void eg_destroy_cache(struct mpoa_client *mpc)
531 {
532 write_lock_irq(&mpc->egress_lock);
533 while(mpc->eg_cache != NULL)
534 mpc->eg_ops->remove_entry(mpc->eg_cache, mpc);
535 write_unlock_irq(&mpc->egress_lock);
536
537 return;
538 }
539
540
541
542 static struct in_cache_ops ingress_ops = {
543 in_cache_add_entry, /* add_entry */
544 in_cache_get, /* get */
545 in_cache_get_with_mask, /* get_with_mask */
546 in_cache_get_by_vcc, /* get_by_vcc */
547 in_cache_put, /* put */
548 in_cache_remove_entry, /* remove_entry */
549 cache_hit, /* cache_hit */
550 clear_count_and_expired, /* clear_count */
551 check_resolving_entries, /* check_resolving */
552 refresh_entries, /* refresh */
553 in_destroy_cache /* destroy_cache */
554 };
555
556 static struct eg_cache_ops egress_ops = {
557 eg_cache_add_entry, /* add_entry */
558 eg_cache_get_by_cache_id, /* get_by_cache_id */
559 eg_cache_get_by_tag, /* get_by_tag */
560 eg_cache_get_by_vcc, /* get_by_vcc */
561 eg_cache_get_by_src_ip, /* get_by_src_ip */
562 eg_cache_put, /* put */
563 eg_cache_remove_entry, /* remove_entry */
564 update_eg_cache_entry, /* update */
565 clear_expired, /* clear_expired */
566 eg_destroy_cache /* destroy_cache */
567 };
568
569
570 void atm_mpoa_init_cache(struct mpoa_client *mpc)
571 {
572 mpc->in_ops = &ingress_ops;
573 mpc->eg_ops = &egress_ops;
574
575 return;
576 }
577
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