1
2#include <linux/types.h>
3#include <linux/atmmpc.h>
4#include <linux/slab.h>
5#include <linux/time.h>
6
7#include "mpoa_caches.h"
8#include "mpc.h"
9
10
11
12
13
14
15#if 0
16#define dprintk(format, args...) \
17 printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args)
18#else
19#define dprintk(format, args...) \
20 do { if (0) \
21 printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args);\
22 } while (0)
23#endif
24
25#if 0
26#define ddprintk(format, args...) \
27 printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args)
28#else
29#define ddprintk(format, args...) \
30 do { if (0) \
31 printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args);\
32 } while (0)
33#endif
34
35static in_cache_entry *in_cache_get(__be32 dst_ip,
36 struct mpoa_client *client)
37{
38 in_cache_entry *entry;
39
40 read_lock_bh(&client->ingress_lock);
41 entry = client->in_cache;
42 while (entry != NULL) {
43 if (entry->ctrl_info.in_dst_ip == dst_ip) {
44 refcount_inc(&entry->use);
45 read_unlock_bh(&client->ingress_lock);
46 return entry;
47 }
48 entry = entry->next;
49 }
50 read_unlock_bh(&client->ingress_lock);
51
52 return NULL;
53}
54
55static in_cache_entry *in_cache_get_with_mask(__be32 dst_ip,
56 struct mpoa_client *client,
57 __be32 mask)
58{
59 in_cache_entry *entry;
60
61 read_lock_bh(&client->ingress_lock);
62 entry = client->in_cache;
63 while (entry != NULL) {
64 if ((entry->ctrl_info.in_dst_ip & mask) == (dst_ip & mask)) {
65 refcount_inc(&entry->use);
66 read_unlock_bh(&client->ingress_lock);
67 return entry;
68 }
69 entry = entry->next;
70 }
71 read_unlock_bh(&client->ingress_lock);
72
73 return NULL;
74
75}
76
77static in_cache_entry *in_cache_get_by_vcc(struct atm_vcc *vcc,
78 struct mpoa_client *client)
79{
80 in_cache_entry *entry;
81
82 read_lock_bh(&client->ingress_lock);
83 entry = client->in_cache;
84 while (entry != NULL) {
85 if (entry->shortcut == vcc) {
86 refcount_inc(&entry->use);
87 read_unlock_bh(&client->ingress_lock);
88 return entry;
89 }
90 entry = entry->next;
91 }
92 read_unlock_bh(&client->ingress_lock);
93
94 return NULL;
95}
96
97static in_cache_entry *in_cache_add_entry(__be32 dst_ip,
98 struct mpoa_client *client)
99{
100 in_cache_entry *entry = kzalloc(sizeof(in_cache_entry), GFP_KERNEL);
101
102 if (entry == NULL) {
103 pr_info("mpoa: mpoa_caches.c: new_in_cache_entry: out of memory\n");
104 return NULL;
105 }
106
107 dprintk("adding an ingress entry, ip = %pI4\n", &dst_ip);
108
109 refcount_set(&entry->use, 1);
110 dprintk("new_in_cache_entry: about to lock\n");
111 write_lock_bh(&client->ingress_lock);
112 entry->next = client->in_cache;
113 entry->prev = NULL;
114 if (client->in_cache != NULL)
115 client->in_cache->prev = entry;
116 client->in_cache = entry;
117
118 memcpy(entry->MPS_ctrl_ATM_addr, client->mps_ctrl_addr, ATM_ESA_LEN);
119 entry->ctrl_info.in_dst_ip = dst_ip;
120 entry->time = ktime_get_seconds();
121 entry->retry_time = client->parameters.mpc_p4;
122 entry->count = 1;
123 entry->entry_state = INGRESS_INVALID;
124 entry->ctrl_info.holding_time = HOLDING_TIME_DEFAULT;
125 refcount_inc(&entry->use);
126
127 write_unlock_bh(&client->ingress_lock);
128 dprintk("new_in_cache_entry: unlocked\n");
129
130 return entry;
131}
132
133static int cache_hit(in_cache_entry *entry, struct mpoa_client *mpc)
134{
135 struct atm_mpoa_qos *qos;
136 struct k_message msg;
137
138 entry->count++;
139 if (entry->entry_state == INGRESS_RESOLVED && entry->shortcut != NULL)
140 return OPEN;
141
142 if (entry->entry_state == INGRESS_REFRESHING) {
143 if (entry->count > mpc->parameters.mpc_p1) {
144 msg.type = SND_MPOA_RES_RQST;
145 msg.content.in_info = entry->ctrl_info;
146 memcpy(msg.MPS_ctrl, mpc->mps_ctrl_addr, ATM_ESA_LEN);
147 qos = atm_mpoa_search_qos(entry->ctrl_info.in_dst_ip);
148 if (qos != NULL)
149 msg.qos = qos->qos;
150 msg_to_mpoad(&msg, mpc);
151 entry->reply_wait = ktime_get_seconds();
152 entry->entry_state = INGRESS_RESOLVING;
153 }
154 if (entry->shortcut != NULL)
155 return OPEN;
156 return CLOSED;
157 }
158
159 if (entry->entry_state == INGRESS_RESOLVING && entry->shortcut != NULL)
160 return OPEN;
161
162 if (entry->count > mpc->parameters.mpc_p1 &&
163 entry->entry_state == INGRESS_INVALID) {
164 dprintk("(%s) threshold exceeded for ip %pI4, sending MPOA res req\n",
165 mpc->dev->name, &entry->ctrl_info.in_dst_ip);
166 entry->entry_state = INGRESS_RESOLVING;
167 msg.type = SND_MPOA_RES_RQST;
168 memcpy(msg.MPS_ctrl, mpc->mps_ctrl_addr, ATM_ESA_LEN);
169 msg.content.in_info = entry->ctrl_info;
170 qos = atm_mpoa_search_qos(entry->ctrl_info.in_dst_ip);
171 if (qos != NULL)
172 msg.qos = qos->qos;
173 msg_to_mpoad(&msg, mpc);
174 entry->reply_wait = ktime_get_seconds();
175 }
176
177 return CLOSED;
178}
179
180static void in_cache_put(in_cache_entry *entry)
181{
182 if (refcount_dec_and_test(&entry->use)) {
183 memset(entry, 0, sizeof(in_cache_entry));
184 kfree(entry);
185 }
186}
187
188
189
190
191static void in_cache_remove_entry(in_cache_entry *entry,
192 struct mpoa_client *client)
193{
194 struct atm_vcc *vcc;
195 struct k_message msg;
196
197 vcc = entry->shortcut;
198 dprintk("removing an ingress entry, ip = %pI4\n",
199 &entry->ctrl_info.in_dst_ip);
200
201 if (entry->prev != NULL)
202 entry->prev->next = entry->next;
203 else
204 client->in_cache = entry->next;
205 if (entry->next != NULL)
206 entry->next->prev = entry->prev;
207 client->in_ops->put(entry);
208 if (client->in_cache == NULL && client->eg_cache == NULL) {
209 msg.type = STOP_KEEP_ALIVE_SM;
210 msg_to_mpoad(&msg, client);
211 }
212
213
214 if (vcc != NULL) {
215 eg_cache_entry *eg_entry = client->eg_ops->get_by_vcc(vcc,
216 client);
217 if (eg_entry != NULL) {
218 client->eg_ops->put(eg_entry);
219 return;
220 }
221 vcc_release_async(vcc, -EPIPE);
222 }
223}
224
225
226
227static void clear_count_and_expired(struct mpoa_client *client)
228{
229 in_cache_entry *entry, *next_entry;
230 time64_t now;
231
232 now = ktime_get_seconds();
233
234 write_lock_bh(&client->ingress_lock);
235 entry = client->in_cache;
236 while (entry != NULL) {
237 entry->count = 0;
238 next_entry = entry->next;
239 if ((now - entry->time) > entry->ctrl_info.holding_time) {
240 dprintk("holding time expired, ip = %pI4\n",
241 &entry->ctrl_info.in_dst_ip);
242 client->in_ops->remove_entry(entry, client);
243 }
244 entry = next_entry;
245 }
246 write_unlock_bh(&client->ingress_lock);
247}
248
249
250static void check_resolving_entries(struct mpoa_client *client)
251{
252
253 struct atm_mpoa_qos *qos;
254 in_cache_entry *entry;
255 time64_t now;
256 struct k_message msg;
257
258 now = ktime_get_seconds();
259
260 read_lock_bh(&client->ingress_lock);
261 entry = client->in_cache;
262 while (entry != NULL) {
263 if (entry->entry_state == INGRESS_RESOLVING) {
264
265 if ((now - entry->hold_down)
266 < client->parameters.mpc_p6) {
267 entry = entry->next;
268 continue;
269 }
270 if ((now - entry->reply_wait) > entry->retry_time) {
271 entry->retry_time = MPC_C1 * (entry->retry_time);
272
273
274
275
276 if (entry->retry_time > client->parameters.mpc_p5) {
277 entry->hold_down = ktime_get_seconds();
278 entry->retry_time = client->parameters.mpc_p4;
279 entry = entry->next;
280 continue;
281 }
282
283 memset(&entry->hold_down, 0, sizeof(time64_t));
284 msg.type = SND_MPOA_RES_RTRY;
285 memcpy(msg.MPS_ctrl, client->mps_ctrl_addr, ATM_ESA_LEN);
286 msg.content.in_info = entry->ctrl_info;
287 qos = atm_mpoa_search_qos(entry->ctrl_info.in_dst_ip);
288 if (qos != NULL)
289 msg.qos = qos->qos;
290 msg_to_mpoad(&msg, client);
291 entry->reply_wait = ktime_get_seconds();
292 }
293 }
294 entry = entry->next;
295 }
296 read_unlock_bh(&client->ingress_lock);
297}
298
299
300static void refresh_entries(struct mpoa_client *client)
301{
302 time64_t now;
303 struct in_cache_entry *entry = client->in_cache;
304
305 ddprintk("refresh_entries\n");
306 now = ktime_get_seconds();
307
308 read_lock_bh(&client->ingress_lock);
309 while (entry != NULL) {
310 if (entry->entry_state == INGRESS_RESOLVED) {
311 if (!(entry->refresh_time))
312 entry->refresh_time = (2 * (entry->ctrl_info.holding_time))/3;
313 if ((now - entry->reply_wait) >
314 entry->refresh_time) {
315 dprintk("refreshing an entry.\n");
316 entry->entry_state = INGRESS_REFRESHING;
317
318 }
319 }
320 entry = entry->next;
321 }
322 read_unlock_bh(&client->ingress_lock);
323}
324
325static void in_destroy_cache(struct mpoa_client *mpc)
326{
327 write_lock_irq(&mpc->ingress_lock);
328 while (mpc->in_cache != NULL)
329 mpc->in_ops->remove_entry(mpc->in_cache, mpc);
330 write_unlock_irq(&mpc->ingress_lock);
331}
332
333static eg_cache_entry *eg_cache_get_by_cache_id(__be32 cache_id,
334 struct mpoa_client *mpc)
335{
336 eg_cache_entry *entry;
337
338 read_lock_irq(&mpc->egress_lock);
339 entry = mpc->eg_cache;
340 while (entry != NULL) {
341 if (entry->ctrl_info.cache_id == cache_id) {
342 refcount_inc(&entry->use);
343 read_unlock_irq(&mpc->egress_lock);
344 return entry;
345 }
346 entry = entry->next;
347 }
348 read_unlock_irq(&mpc->egress_lock);
349
350 return NULL;
351}
352
353
354static eg_cache_entry *eg_cache_get_by_tag(__be32 tag, struct mpoa_client *mpc)
355{
356 unsigned long flags;
357 eg_cache_entry *entry;
358
359 read_lock_irqsave(&mpc->egress_lock, flags);
360 entry = mpc->eg_cache;
361 while (entry != NULL) {
362 if (entry->ctrl_info.tag == tag) {
363 refcount_inc(&entry->use);
364 read_unlock_irqrestore(&mpc->egress_lock, flags);
365 return entry;
366 }
367 entry = entry->next;
368 }
369 read_unlock_irqrestore(&mpc->egress_lock, flags);
370
371 return NULL;
372}
373
374
375static eg_cache_entry *eg_cache_get_by_vcc(struct atm_vcc *vcc,
376 struct mpoa_client *mpc)
377{
378 unsigned long flags;
379 eg_cache_entry *entry;
380
381 read_lock_irqsave(&mpc->egress_lock, flags);
382 entry = mpc->eg_cache;
383 while (entry != NULL) {
384 if (entry->shortcut == vcc) {
385 refcount_inc(&entry->use);
386 read_unlock_irqrestore(&mpc->egress_lock, flags);
387 return entry;
388 }
389 entry = entry->next;
390 }
391 read_unlock_irqrestore(&mpc->egress_lock, flags);
392
393 return NULL;
394}
395
396static eg_cache_entry *eg_cache_get_by_src_ip(__be32 ipaddr,
397 struct mpoa_client *mpc)
398{
399 eg_cache_entry *entry;
400
401 read_lock_irq(&mpc->egress_lock);
402 entry = mpc->eg_cache;
403 while (entry != NULL) {
404 if (entry->latest_ip_addr == ipaddr) {
405 refcount_inc(&entry->use);
406 read_unlock_irq(&mpc->egress_lock);
407 return entry;
408 }
409 entry = entry->next;
410 }
411 read_unlock_irq(&mpc->egress_lock);
412
413 return NULL;
414}
415
416static void eg_cache_put(eg_cache_entry *entry)
417{
418 if (refcount_dec_and_test(&entry->use)) {
419 memset(entry, 0, sizeof(eg_cache_entry));
420 kfree(entry);
421 }
422}
423
424
425
426
427static void eg_cache_remove_entry(eg_cache_entry *entry,
428 struct mpoa_client *client)
429{
430 struct atm_vcc *vcc;
431 struct k_message msg;
432
433 vcc = entry->shortcut;
434 dprintk("removing an egress entry.\n");
435 if (entry->prev != NULL)
436 entry->prev->next = entry->next;
437 else
438 client->eg_cache = entry->next;
439 if (entry->next != NULL)
440 entry->next->prev = entry->prev;
441 client->eg_ops->put(entry);
442 if (client->in_cache == NULL && client->eg_cache == NULL) {
443 msg.type = STOP_KEEP_ALIVE_SM;
444 msg_to_mpoad(&msg, client);
445 }
446
447
448 if (vcc != NULL) {
449 in_cache_entry *in_entry = client->in_ops->get_by_vcc(vcc, client);
450 if (in_entry != NULL) {
451 client->in_ops->put(in_entry);
452 return;
453 }
454 vcc_release_async(vcc, -EPIPE);
455 }
456}
457
458static eg_cache_entry *eg_cache_add_entry(struct k_message *msg,
459 struct mpoa_client *client)
460{
461 eg_cache_entry *entry = kzalloc(sizeof(eg_cache_entry), GFP_KERNEL);
462
463 if (entry == NULL) {
464 pr_info("out of memory\n");
465 return NULL;
466 }
467
468 dprintk("adding an egress entry, ip = %pI4, this should be our IP\n",
469 &msg->content.eg_info.eg_dst_ip);
470
471 refcount_set(&entry->use, 1);
472 dprintk("new_eg_cache_entry: about to lock\n");
473 write_lock_irq(&client->egress_lock);
474 entry->next = client->eg_cache;
475 entry->prev = NULL;
476 if (client->eg_cache != NULL)
477 client->eg_cache->prev = entry;
478 client->eg_cache = entry;
479
480 memcpy(entry->MPS_ctrl_ATM_addr, client->mps_ctrl_addr, ATM_ESA_LEN);
481 entry->ctrl_info = msg->content.eg_info;
482 entry->time = ktime_get_seconds();
483 entry->entry_state = EGRESS_RESOLVED;
484 dprintk("new_eg_cache_entry cache_id %u\n",
485 ntohl(entry->ctrl_info.cache_id));
486 dprintk("mps_ip = %pI4\n", &entry->ctrl_info.mps_ip);
487 refcount_inc(&entry->use);
488
489 write_unlock_irq(&client->egress_lock);
490 dprintk("new_eg_cache_entry: unlocked\n");
491
492 return entry;
493}
494
495static void update_eg_cache_entry(eg_cache_entry *entry, uint16_t holding_time)
496{
497 entry->time = ktime_get_seconds();
498 entry->entry_state = EGRESS_RESOLVED;
499 entry->ctrl_info.holding_time = holding_time;
500}
501
502static void clear_expired(struct mpoa_client *client)
503{
504 eg_cache_entry *entry, *next_entry;
505 time64_t now;
506 struct k_message msg;
507
508 now = ktime_get_seconds();
509
510 write_lock_irq(&client->egress_lock);
511 entry = client->eg_cache;
512 while (entry != NULL) {
513 next_entry = entry->next;
514 if ((now - entry->time) > entry->ctrl_info.holding_time) {
515 msg.type = SND_EGRESS_PURGE;
516 msg.content.eg_info = entry->ctrl_info;
517 dprintk("egress_cache: holding time expired, cache_id = %u.\n",
518 ntohl(entry->ctrl_info.cache_id));
519 msg_to_mpoad(&msg, client);
520 client->eg_ops->remove_entry(entry, client);
521 }
522 entry = next_entry;
523 }
524 write_unlock_irq(&client->egress_lock);
525}
526
527static void eg_destroy_cache(struct mpoa_client *mpc)
528{
529 write_lock_irq(&mpc->egress_lock);
530 while (mpc->eg_cache != NULL)
531 mpc->eg_ops->remove_entry(mpc->eg_cache, mpc);
532 write_unlock_irq(&mpc->egress_lock);
533}
534
535
536static const struct in_cache_ops ingress_ops = {
537 .add_entry = in_cache_add_entry,
538 .get = in_cache_get,
539 .get_with_mask = in_cache_get_with_mask,
540 .get_by_vcc = in_cache_get_by_vcc,
541 .put = in_cache_put,
542 .remove_entry = in_cache_remove_entry,
543 .cache_hit = cache_hit,
544 .clear_count = clear_count_and_expired,
545 .check_resolving = check_resolving_entries,
546 .refresh = refresh_entries,
547 .destroy_cache = in_destroy_cache
548};
549
550static const struct eg_cache_ops egress_ops = {
551 .add_entry = eg_cache_add_entry,
552 .get_by_cache_id = eg_cache_get_by_cache_id,
553 .get_by_tag = eg_cache_get_by_tag,
554 .get_by_vcc = eg_cache_get_by_vcc,
555 .get_by_src_ip = eg_cache_get_by_src_ip,
556 .put = eg_cache_put,
557 .remove_entry = eg_cache_remove_entry,
558 .update = update_eg_cache_entry,
559 .clear_expired = clear_expired,
560 .destroy_cache = eg_destroy_cache
561};
562
563void atm_mpoa_init_cache(struct mpoa_client *mpc)
564{
565 mpc->in_ops = &ingress_ops;
566 mpc->eg_ops = &egress_ops;
567}
568
