?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
code style scripts/checkpatch.pl formatting round #4 (2.6.34.14)
[linux-2.6.34.14-moxart.git] / net / atm / mpc.c
blob436f2e177657e7b184c7afe5c467f97cbcc420cd
1 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
2
3 #include <linux/kernel.h>
4 #include <linux/string.h>
5 #include <linux/slab.h>
6 #include <linux/timer.h>
7 #include <linux/init.h>
8 #include <linux/bitops.h>
9 #include <linux/capability.h>
10 #include <linux/seq_file.h>
11
12 /* We are an ethernet device */
13 #include <linux/if_ether.h>
14 #include <linux/netdevice.h>
15 #include <linux/etherdevice.h>
16 #include <net/sock.h>
17 #include <linux/skbuff.h>
18 #include <linux/ip.h>
19 #include <linux/uaccess.h>
20 #include <asm/byteorder.h>
21 #include <net/checksum.h> /* for ip_fast_csum() */
22 #include <net/arp.h>
23 #include <net/dst.h>
24 #include <linux/proc_fs.h>
25
26 /* And atm device */
27 #include <linux/atmdev.h>
28 #include <linux/atmlec.h>
29 #include <linux/atmmpc.h>
30 /* Modular too */
31 #include <linux/module.h>
32
33 #include "lec.h"
34 #include "mpc.h"
35 #include "resources.h"
36
37 /*
38 * mpc.c: Implementation of MPOA client kernel part
39 */
40
41 #if 0
42 #define dprintk(format, args...) \
43 printk(KERN_DEBUG "mpoa:%s: " format, __func__, ##args)
44 #define dprintk_cont(format, args...) printk(KERN_CONT format, ##args)
45 #else
46 #define dprintk(format, args...) \
47 do { if (0) \
48 printk(KERN_DEBUG "mpoa:%s: " format, __func__, ##args);\
49 } while (0)
50 #define dprintk_cont(format, args...) \
51 do { if (0) printk(KERN_CONT format, ##args); } while (0)
52 #endif
53
54 #if 0
55 #define ddprintk(format, args...) \
56 printk(KERN_DEBUG "mpoa:%s: " format, __func__, ##args)
57 #define ddprintk_cont(format, args...) printk(KERN_CONT format, ##args)
58 #else
59 #define ddprintk(format, args...) \
60 do { if (0) \
61 printk(KERN_DEBUG "mpoa:%s: " format, __func__, ##args);\
62 } while (0)
63 #define ddprintk_cont(format, args...) \
64 do { if (0) printk(KERN_CONT format, ##args); } while (0)
65 #endif
66
67 #define MPOA_TAG_LEN 4
68
69 /* mpc_daemon -> kernel */
70 static void MPOA_trigger_rcvd(struct k_message *msg, struct mpoa_client *mpc);
71 static void MPOA_res_reply_rcvd(struct k_message *msg, struct mpoa_client *mpc);
72 static void ingress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc);
73 static void egress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc);
74 static void mps_death(struct k_message *msg, struct mpoa_client *mpc);
75 static void clean_up(struct k_message *msg, struct mpoa_client *mpc,
76 int action);
77 static void MPOA_cache_impos_rcvd(struct k_message *msg,
78 struct mpoa_client *mpc);
79 static void set_mpc_ctrl_addr_rcvd(struct k_message *mesg,
80 struct mpoa_client *mpc);
81 static void set_mps_mac_addr_rcvd(struct k_message *mesg,
82 struct mpoa_client *mpc);
83
84 static const uint8_t *copy_macs(struct mpoa_client *mpc,
85 const uint8_t *router_mac,
86 const uint8_t *tlvs, uint8_t mps_macs,
87 uint8_t device_type);
88 static void purge_egress_shortcut(struct atm_vcc *vcc, eg_cache_entry *entry);
89
90 static void send_set_mps_ctrl_addr(const char *addr, struct mpoa_client *mpc);
91 static void mpoad_close(struct atm_vcc *vcc);
92 static int msg_from_mpoad(struct atm_vcc *vcc, struct sk_buff *skb);
93
94 static void mpc_push(struct atm_vcc *vcc, struct sk_buff *skb);
95 static netdev_tx_t mpc_send_packet(struct sk_buff *skb,
96 struct net_device *dev);
97 static int mpoa_event_listener(struct notifier_block *mpoa_notifier,
98 unsigned long event, void *dev);
99 static void mpc_timer_refresh(void);
100 static void mpc_cache_check(unsigned long checking_time);
101
102 static struct llc_snap_hdr llc_snap_mpoa_ctrl = {
103 0xaa, 0xaa, 0x03,
104 {0x00, 0x00, 0x5e},
105 {0x00, 0x03} /* For MPOA control PDUs */
106 };
107 static struct llc_snap_hdr llc_snap_mpoa_data = {
108 0xaa, 0xaa, 0x03,
109 {0x00, 0x00, 0x00},
110 {0x08, 0x00} /* This is for IP PDUs only */
111 };
112 static struct llc_snap_hdr llc_snap_mpoa_data_tagged = {
113 0xaa, 0xaa, 0x03,
114 {0x00, 0x00, 0x00},
115 {0x88, 0x4c} /* This is for tagged data PDUs */
116 };
117
118 static struct notifier_block mpoa_notifier = {
119 mpoa_event_listener,
120 NULL,
121 0
122 };
123
124 struct mpoa_client *mpcs = NULL; /* FIXME */
125 static struct atm_mpoa_qos *qos_head = NULL;
126 static DEFINE_TIMER(mpc_timer, NULL, 0, 0);
127
128
129 static struct mpoa_client *find_mpc_by_itfnum(int itf)
130 {
131 struct mpoa_client *mpc;
132
133 mpc = mpcs; /* our global linked list */
134 while (mpc != NULL) {
135 if (mpc->dev_num == itf)
136 return mpc;
137 mpc = mpc->next;
138 }
139
140 return NULL; /* not found */
141 }
142
143 static struct mpoa_client *find_mpc_by_vcc(struct atm_vcc *vcc)
144 {
145 struct mpoa_client *mpc;
146
147 mpc = mpcs; /* our global linked list */
148 while (mpc != NULL) {
149 if (mpc->mpoad_vcc == vcc)
150 return mpc;
151 mpc = mpc->next;
152 }
153
154 return NULL; /* not found */
155 }
156
157 static struct mpoa_client *find_mpc_by_lec(struct net_device *dev)
158 {
159 struct mpoa_client *mpc;
160
161 mpc = mpcs; /* our global linked list */
162 while (mpc != NULL) {
163 if (mpc->dev == dev)
164 return mpc;
165 mpc = mpc->next;
166 }
167
168 return NULL; /* not found */
169 }
170
171 /*
172 * Functions for managing QoS list
173 */
174
175 /*
176 * Overwrites the old entry or makes a new one.
177 */
178 struct atm_mpoa_qos *atm_mpoa_add_qos(__be32 dst_ip, struct atm_qos *qos)
179 {
180 struct atm_mpoa_qos *entry;
181
182 entry = atm_mpoa_search_qos(dst_ip);
183 if (entry != NULL) {
184 entry->qos = *qos;
185 return entry;
186 }
187
188 entry = kmalloc(sizeof(struct atm_mpoa_qos), GFP_KERNEL);
189 if (entry == NULL) {
190 pr_info("mpoa: out of memory\n");
191 return entry;
192 }
193
194 entry->ipaddr = dst_ip;
195 entry->qos = *qos;
196
197 entry->next = qos_head;
198 qos_head = entry;
199
200 return entry;
201 }
202
203 struct atm_mpoa_qos *atm_mpoa_search_qos(__be32 dst_ip)
204 {
205 struct atm_mpoa_qos *qos;
206
207 qos = qos_head;
208 while (qos) {
209 if (qos->ipaddr == dst_ip)
210 break;
211 qos = qos->next;
212 }
213
214 return qos;
215 }
216
217 /*
218 * Returns 0 for failure
219 */
220 int atm_mpoa_delete_qos(struct atm_mpoa_qos *entry)
221 {
222 struct atm_mpoa_qos *curr;
223
224 if (entry == NULL)
225 return 0;
226 if (entry == qos_head) {
227 qos_head = qos_head->next;
228 kfree(entry);
229 return 1;
230 }
231
232 curr = qos_head;
233 while (curr != NULL) {
234 if (curr->next == entry) {
235 curr->next = entry->next;
236 kfree(entry);
237 return 1;
238 }
239 curr = curr->next;
240 }
241
242 return 0;
243 }
244
245 /* this is buggered - we need locking for qos_head */
246 void atm_mpoa_disp_qos(struct seq_file *m)
247 {
248 struct atm_mpoa_qos *qos;
249
250 qos = qos_head;
251 seq_printf(m, "QoS entries for shortcuts:\n");
252 seq_printf(m, "IP address\n TX:max_pcr pcr min_pcr max_cdv max_sdu\n RX:max_pcr pcr min_pcr max_cdv max_sdu\n");
253
254 while (qos != NULL) {
255 seq_printf(m, "%pI4\n %-7d %-7d %-7d %-7d %-7d\n %-7d %-7d %-7d %-7d %-7d\n",
256 &qos->ipaddr,
257 qos->qos.txtp.max_pcr,
258 qos->qos.txtp.pcr,
259 qos->qos.txtp.min_pcr,
260 qos->qos.txtp.max_cdv,
261 qos->qos.txtp.max_sdu,
262 qos->qos.rxtp.max_pcr,
263 qos->qos.rxtp.pcr,
264 qos->qos.rxtp.min_pcr,
265 qos->qos.rxtp.max_cdv,
266 qos->qos.rxtp.max_sdu);
267 qos = qos->next;
268 }
269 }
270
271 static struct net_device *find_lec_by_itfnum(int itf)
272 {
273 struct net_device *dev;
274 char name[IFNAMSIZ];
275
276 sprintf(name, "lec%d", itf);
277 dev = dev_get_by_name(&init_net, name);
278
279 return dev;
280 }
281
282 static struct mpoa_client *alloc_mpc(void)
283 {
284 struct mpoa_client *mpc;
285
286 mpc = kzalloc(sizeof(struct mpoa_client), GFP_KERNEL);
287 if (mpc == NULL)
288 return NULL;
289 rwlock_init(&mpc->ingress_lock);
290 rwlock_init(&mpc->egress_lock);
291 mpc->next = mpcs;
292 atm_mpoa_init_cache(mpc);
293
294 mpc->parameters.mpc_p1 = MPC_P1;
295 mpc->parameters.mpc_p2 = MPC_P2;
296 memset(mpc->parameters.mpc_p3, 0, sizeof(mpc->parameters.mpc_p3));
297 mpc->parameters.mpc_p4 = MPC_P4;
298 mpc->parameters.mpc_p5 = MPC_P5;
299 mpc->parameters.mpc_p6 = MPC_P6;
300
301 mpcs = mpc;
302
303 return mpc;
304 }
305
306 /*
307 *
308 * start_mpc() puts the MPC on line. All the packets destined
309 * to the lec underneath us are now being monitored and
310 * shortcuts will be established.
311 *
312 */
313 static void start_mpc(struct mpoa_client *mpc, struct net_device *dev)
314 {
315
316 dprintk("(%s)\n", mpc->dev->name);
317 if (!dev->netdev_ops)
318 pr_info("(%s) not starting\n", dev->name);
319 else {
320 mpc->old_ops = dev->netdev_ops;
321 mpc->new_ops = *mpc->old_ops;
322 mpc->new_ops.ndo_start_xmit = mpc_send_packet;
323 dev->netdev_ops = &mpc->new_ops;
324 }
325 }
326
327 static void stop_mpc(struct mpoa_client *mpc)
328 {
329 struct net_device *dev = mpc->dev;
330 dprintk("(%s)", mpc->dev->name);
331
332 /* Lets not nullify lec device's dev->hard_start_xmit */
333 if (dev->netdev_ops != &mpc->new_ops) {
334 dprintk_cont(" mpc already stopped, not fatal\n");
335 return;
336 }
337 dprintk_cont("\n");
338
339 dev->netdev_ops = mpc->old_ops;
340 mpc->old_ops = NULL;
341
342 /* close_shortcuts(mpc); ??? FIXME */
343 }
344
345 static const char *mpoa_device_type_string(char type) __attribute__ ((unused));
346
347 static const char *mpoa_device_type_string(char type)
348 {
349 switch (type) {
350 case NON_MPOA:
351 return "non-MPOA device";
352 case MPS:
353 return "MPS";
354 case MPC:
355 return "MPC";
356 case MPS_AND_MPC:
357 return "both MPS and MPC";
358 }
359
360 return "unspecified (non-MPOA) device";
361 }
362
363 /*
364 * lec device calls this via its netdev_priv(dev)->lane2_ops
365 * ->associate_indicator() when it sees a TLV in LE_ARP packet.
366 * We fill in the pointer above when we see a LANE2 lec initializing
367 * See LANE2 spec 3.1.5
368 *
369 * Quite a big and ugly function but when you look at it
370 * all it does is to try to locate and parse MPOA Device
371 * Type TLV.
372 * We give our lec a pointer to this function and when the
373 * lec sees a TLV it uses the pointer to call this function.
374 *
375 */
376 static void lane2_assoc_ind(struct net_device *dev, const u8 *mac_addr,
377 const u8 *tlvs, u32 sizeoftlvs)
378 {
379 uint32_t type;
380 uint8_t length, mpoa_device_type, number_of_mps_macs;
381 const uint8_t *end_of_tlvs;
382 struct mpoa_client *mpc;
383
384 mpoa_device_type = number_of_mps_macs = 0; /* silence gcc */
385 dprintk("(%s) received TLV(s), ", dev->name);
386 dprintk("total length of all TLVs %d\n", sizeoftlvs);
387 mpc = find_mpc_by_lec(dev); /* Sampo-Fix: moved here from below */
388 if (mpc == NULL) {
389 pr_info("(%s) no mpc\n", dev->name);
390 return;
391 }
392 end_of_tlvs = tlvs + sizeoftlvs;
393 while (end_of_tlvs - tlvs >= 5) {
394 type = ((tlvs[0] << 24) | (tlvs[1] << 16) |
395 (tlvs[2] << 8) | tlvs[3]);
396 length = tlvs[4];
397 tlvs += 5;
398 dprintk(" type 0x%x length %02x\n", type, length);
399 if (tlvs + length > end_of_tlvs) {
400 pr_info("TLV value extends past its buffer, aborting parse\n");
401 return;
402 }
403
404 if (type == 0) {
405 pr_info("mpoa: (%s) TLV type was 0, returning\n",
406 dev->name);
407 return;
408 }
409
410 if (type != TLV_MPOA_DEVICE_TYPE) {
411 tlvs += length;
412 continue; /* skip other TLVs */
413 }
414 mpoa_device_type = *tlvs++;
415 number_of_mps_macs = *tlvs++;
416 dprintk("(%s) MPOA device type '%s', ",
417 dev->name, mpoa_device_type_string(mpoa_device_type));
418 if (mpoa_device_type == MPS_AND_MPC &&
419 length < (42 + number_of_mps_macs*ETH_ALEN)) { /* :) */
420 pr_info("(%s) short MPOA Device Type TLV\n",
421 dev->name);
422 continue;
423 }
424 if ((mpoa_device_type == MPS || mpoa_device_type == MPC) &&
425 length < 22 + number_of_mps_macs*ETH_ALEN) {
426 pr_info("(%s) short MPOA Device Type TLV\n", dev->name);
427 continue;
428 }
429 if (mpoa_device_type != MPS &&
430 mpoa_device_type != MPS_AND_MPC) {
431 dprintk("ignoring non-MPS device ");
432 if (mpoa_device_type == MPC)
433 tlvs += 20;
434 continue; /* we are only interested in MPSs */
435 }
436 if (number_of_mps_macs == 0 &&
437 mpoa_device_type == MPS_AND_MPC) {
438 pr_info("(%s) MPS_AND_MPC has zero MACs\n", dev->name);
439 continue; /* someone should read the spec */
440 }
441 dprintk_cont("this MPS has %d MAC addresses\n",
442 number_of_mps_macs);
443
444 /*
445 * ok, now we can go and tell our daemon
446 * the control address of MPS
447 */
448 send_set_mps_ctrl_addr(tlvs, mpc);
449
450 tlvs = copy_macs(mpc, mac_addr, tlvs,
451 number_of_mps_macs, mpoa_device_type);
452 if (tlvs == NULL)
453 return;
454 }
455 if (end_of_tlvs - tlvs != 0)
456 pr_info("(%s) ignoring %Zd bytes of trailing TLV garbage\n",
457 dev->name, end_of_tlvs - tlvs);
458 return;
459 }
460
461 /*
462 * Store at least advertizing router's MAC address
463 * plus the possible MAC address(es) to mpc->mps_macs.
464 * For a freshly allocated MPOA client mpc->mps_macs == 0.
465 */
466 static const uint8_t *copy_macs(struct mpoa_client *mpc,
467 const uint8_t *router_mac,
468 const uint8_t *tlvs, uint8_t mps_macs,
469 uint8_t device_type)
470 {
471 int num_macs;
472 num_macs = (mps_macs > 1) ? mps_macs : 1;
473
474 if (mpc->number_of_mps_macs != num_macs) { /* need to reallocate? */
475 if (mpc->number_of_mps_macs != 0)
476 kfree(mpc->mps_macs);
477 mpc->number_of_mps_macs = 0;
478 mpc->mps_macs = kmalloc(num_macs * ETH_ALEN, GFP_KERNEL);
479 if (mpc->mps_macs == NULL) {
480 pr_info("(%s) out of mem\n", mpc->dev->name);
481 return NULL;
482 }
483 }
484 memcpy(mpc->mps_macs, router_mac, ETH_ALEN);
485 tlvs += 20; if (device_type == MPS_AND_MPC) tlvs += 20;
486 if (mps_macs > 0)
487 memcpy(mpc->mps_macs, tlvs, mps_macs*ETH_ALEN);
488 tlvs += mps_macs*ETH_ALEN;
489 mpc->number_of_mps_macs = num_macs;
490
491 return tlvs;
492 }
493
494 static int send_via_shortcut(struct sk_buff *skb, struct mpoa_client *mpc)
495 {
496 in_cache_entry *entry;
497 struct iphdr *iph;
498 char *buff;
499 __be32 ipaddr = 0;
500
501 static struct {
502 struct llc_snap_hdr hdr;
503 __be32 tag;
504 } tagged_llc_snap_hdr = {
505 {0xaa, 0xaa, 0x03, {0x00, 0x00, 0x00}, {0x88, 0x4c}},
506 0
507 };
508
509 buff = skb->data + mpc->dev->hard_header_len;
510 iph = (struct iphdr *)buff;
511 ipaddr = iph->daddr;
512
513 ddprintk("(%s) ipaddr 0x%x\n",
514 mpc->dev->name, ipaddr);
515
516 entry = mpc->in_ops->get(ipaddr, mpc);
517 if (entry == NULL) {
518 entry = mpc->in_ops->add_entry(ipaddr, mpc);
519 if (entry != NULL)
520 mpc->in_ops->put(entry);
521 return 1;
522 }
523 /* threshold not exceeded or VCC not ready */
524 if (mpc->in_ops->cache_hit(entry, mpc) != OPEN) {
525 ddprintk("(%s) cache_hit: returns != OPEN\n",
526 mpc->dev->name);
527 mpc->in_ops->put(entry);
528 return 1;
529 }
530
531 ddprintk("(%s) using shortcut\n",
532 mpc->dev->name);
533 /* MPOA spec A.1.4, MPOA client must decrement IP ttl at least by one */
534 if (iph->ttl <= 1) {
535 ddprintk("(%s) IP ttl = %u, using LANE\n",
536 mpc->dev->name, iph->ttl);
537 mpc->in_ops->put(entry);
538 return 1;
539 }
540 iph->ttl--;
541 iph->check = 0;
542 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
543
544 if (entry->ctrl_info.tag != 0) {
545 ddprintk("(%s) adding tag 0x%x\n",
546 mpc->dev->name, entry->ctrl_info.tag);
547 tagged_llc_snap_hdr.tag = entry->ctrl_info.tag;
548 skb_pull(skb, ETH_HLEN); /* get rid of Eth header */
549 skb_push(skb, sizeof(tagged_llc_snap_hdr));
550 /* add LLC/SNAP header */
551 skb_copy_to_linear_data(skb, &tagged_llc_snap_hdr,
552 sizeof(tagged_llc_snap_hdr));
553 } else {
554 skb_pull(skb, ETH_HLEN); /* get rid of Eth header */
555 skb_push(skb, sizeof(struct llc_snap_hdr));
556 /* add LLC/SNAP header + tag */
557 skb_copy_to_linear_data(skb, &llc_snap_mpoa_data,
558 sizeof(struct llc_snap_hdr));
559 }
560
561 atomic_add(skb->truesize, &sk_atm(entry->shortcut)->sk_wmem_alloc);
562 ATM_SKB(skb)->atm_options = entry->shortcut->atm_options;
563 entry->shortcut->send(entry->shortcut, skb);
564 entry->packets_fwded++;
565 mpc->in_ops->put(entry);
566
567 return 0;
568 }
569
570 /*
571 * Probably needs some error checks and locking, not sure...
572 */
573 static netdev_tx_t mpc_send_packet(struct sk_buff *skb,
574 struct net_device *dev)
575 {
576 struct mpoa_client *mpc;
577 struct ethhdr *eth;
578 int i = 0;
579
580 mpc = find_mpc_by_lec(dev); /* this should NEVER fail */
581 if (mpc == NULL) {
582 pr_info("(%s) no MPC found\n", dev->name);
583 goto non_ip;
584 }
585
586 eth = (struct ethhdr *)skb->data;
587 if (eth->h_proto != htons(ETH_P_IP))
588 goto non_ip; /* Multi-Protocol Over ATM :-) */
589
590 /* Weed out funny packets (e.g., AF_PACKET or raw). */
591 if (skb->len < ETH_HLEN + sizeof(struct iphdr))
592 goto non_ip;
593 skb_set_network_header(skb, ETH_HLEN);
594 if (skb->len < ETH_HLEN + ip_hdr(skb)->ihl * 4 || ip_hdr(skb)->ihl < 5)
595 goto non_ip;
596
597 while (i < mpc->number_of_mps_macs) {
598 if (!compare_ether_addr(eth->h_dest,
599 (mpc->mps_macs + i*ETH_ALEN)))
600 if (send_via_shortcut(skb, mpc) == 0) /* try shortcut */
601 return NETDEV_TX_OK;
602 i++;
603 }
604
605 non_ip:
606 return mpc->old_ops->ndo_start_xmit(skb, dev);
607 }
608
609 static int atm_mpoa_vcc_attach(struct atm_vcc *vcc, void __user *arg)
610 {
611 int bytes_left;
612 struct mpoa_client *mpc;
613 struct atmmpc_ioc ioc_data;
614 in_cache_entry *in_entry;
615 __be32 ipaddr;
616
617 bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmmpc_ioc));
618 if (bytes_left != 0) {
619 pr_info("mpoa:Short read (missed %d bytes) from userland\n",
620 bytes_left);
621 return -EFAULT;
622 }
623 ipaddr = ioc_data.ipaddr;
624 if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF)
625 return -EINVAL;
626
627 mpc = find_mpc_by_itfnum(ioc_data.dev_num);
628 if (mpc == NULL)
629 return -EINVAL;
630
631 if (ioc_data.type == MPC_SOCKET_INGRESS) {
632 in_entry = mpc->in_ops->get(ipaddr, mpc);
633 if (in_entry == NULL ||
634 in_entry->entry_state < INGRESS_RESOLVED) {
635 pr_info("(%s) did not find RESOLVED entry from ingress cache\n",
636 mpc->dev->name);
637 if (in_entry != NULL)
638 mpc->in_ops->put(in_entry);
639 return -EINVAL;
640 }
641 pr_info("(%s) attaching ingress SVC, entry = %pI4\n",
642 mpc->dev->name, &in_entry->ctrl_info.in_dst_ip);
643 in_entry->shortcut = vcc;
644 mpc->in_ops->put(in_entry);
645 } else {
646 pr_info("(%s) attaching egress SVC\n", mpc->dev->name);
647 }
648
649 vcc->proto_data = mpc->dev;
650 vcc->push = mpc_push;
651
652 return 0;
653 }
654
655 /*
656 *
657 */
658 static void mpc_vcc_close(struct atm_vcc *vcc, struct net_device *dev)
659 {
660 struct mpoa_client *mpc;
661 in_cache_entry *in_entry;
662 eg_cache_entry *eg_entry;
663
664 mpc = find_mpc_by_lec(dev);
665 if (mpc == NULL) {
666 pr_info("(%s) close for unknown MPC\n", dev->name);
667 return;
668 }
669
670 dprintk("(%s)\n", dev->name);
671 in_entry = mpc->in_ops->get_by_vcc(vcc, mpc);
672 if (in_entry) {
673 dprintk("(%s) ingress SVC closed ip = %pI4\n",
674 mpc->dev->name, &in_entry->ctrl_info.in_dst_ip);
675 in_entry->shortcut = NULL;
676 mpc->in_ops->put(in_entry);
677 }
678 eg_entry = mpc->eg_ops->get_by_vcc(vcc, mpc);
679 if (eg_entry) {
680 dprintk("(%s) egress SVC closed\n", mpc->dev->name);
681 eg_entry->shortcut = NULL;
682 mpc->eg_ops->put(eg_entry);
683 }
684
685 if (in_entry == NULL && eg_entry == NULL)
686 dprintk("(%s) unused vcc closed\n", dev->name);
687
688 return;
689 }
690
691 static void mpc_push(struct atm_vcc *vcc, struct sk_buff *skb)
692 {
693 struct net_device *dev = (struct net_device *)vcc->proto_data;
694 struct sk_buff *new_skb;
695 eg_cache_entry *eg;
696 struct mpoa_client *mpc;
697 __be32 tag;
698 char *tmp;
699
700 ddprintk("(%s)\n", dev->name);
701 if (skb == NULL) {
702 dprintk("(%s) null skb, closing VCC\n", dev->name);
703 mpc_vcc_close(vcc, dev);
704 return;
705 }
706
707 skb->dev = dev;
708 if (memcmp(skb->data, &llc_snap_mpoa_ctrl,
709 sizeof(struct llc_snap_hdr)) == 0) {
710 struct sock *sk = sk_atm(vcc);
711
712 dprintk("(%s) control packet arrived\n", dev->name);
713 /* Pass control packets to daemon */
714 skb_queue_tail(&sk->sk_receive_queue, skb);
715 sk->sk_data_ready(sk, skb->len);
716 return;
717 }
718
719 /* data coming over the shortcut */
720 atm_return(vcc, skb->truesize);
721
722 mpc = find_mpc_by_lec(dev);
723 if (mpc == NULL) {
724 pr_info("(%s) unknown MPC\n", dev->name);
725 return;
726 }
727
728 if (memcmp(skb->data, &llc_snap_mpoa_data_tagged,
729 sizeof(struct llc_snap_hdr)) == 0) { /* MPOA tagged data */
730 ddprintk("(%s) tagged data packet arrived\n", dev->name);
731
732 } else if (memcmp(skb->data, &llc_snap_mpoa_data,
733 sizeof(struct llc_snap_hdr)) == 0) { /* MPOA data */
734 pr_info("(%s) Unsupported non-tagged data packet arrived. Purging\n",
735 dev->name);
736 dev_kfree_skb_any(skb);
737 return;
738 } else {
739 pr_info("(%s) garbage arrived, purging\n", dev->name);
740 dev_kfree_skb_any(skb);
741 return;
742 }
743
744 tmp = skb->data + sizeof(struct llc_snap_hdr);
745 tag = *(__be32 *)tmp;
746
747 eg = mpc->eg_ops->get_by_tag(tag, mpc);
748 if (eg == NULL) {
749 pr_info("mpoa: (%s) Didn't find egress cache entry, tag = %u\n",
750 dev->name, tag);
751 purge_egress_shortcut(vcc, NULL);
752 dev_kfree_skb_any(skb);
753 return;
754 }
755
756 /*
757 * See if ingress MPC is using shortcut we opened as a return channel.
758 * This means we have a bi-directional vcc opened by us.
759 */
760 if (eg->shortcut == NULL) {
761 eg->shortcut = vcc;
762 pr_info("(%s) egress SVC in use\n", dev->name);
763 }
764
765 skb_pull(skb, sizeof(struct llc_snap_hdr) + sizeof(tag));
766 /* get rid of LLC/SNAP header */
767 new_skb = skb_realloc_headroom(skb, eg->ctrl_info.DH_length);
768 /* LLC/SNAP is shorter than MAC header :( */
769 dev_kfree_skb_any(skb);
770 if (new_skb == NULL) {
771 mpc->eg_ops->put(eg);
772 return;
773 }
774 skb_push(new_skb, eg->ctrl_info.DH_length); /* add MAC header */
775 skb_copy_to_linear_data(new_skb, eg->ctrl_info.DLL_header,
776 eg->ctrl_info.DH_length);
777 new_skb->protocol = eth_type_trans(new_skb, dev);
778 skb_reset_network_header(new_skb);
779
780 eg->latest_ip_addr = ip_hdr(new_skb)->saddr;
781 eg->packets_rcvd++;
782 mpc->eg_ops->put(eg);
783
784 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
785 netif_rx(new_skb);
786
787 return;
788 }
789
790 static struct atmdev_ops mpc_ops = { /* only send is required */
791 .close = mpoad_close,
792 .send = msg_from_mpoad
793 };
794
795 static struct atm_dev mpc_dev = {
796 .ops = &mpc_ops,
797 .type = "mpc",
798 .number = 42,
799 .lock = __SPIN_LOCK_UNLOCKED(mpc_dev.lock)
800 /* members not explicitly initialised will be 0 */
801 };
802
803 static int atm_mpoa_mpoad_attach(struct atm_vcc *vcc, int arg)
804 {
805 struct mpoa_client *mpc;
806 struct lec_priv *priv;
807 int err;
808
809 if (mpcs == NULL) {
810 init_timer(&mpc_timer);
811 mpc_timer_refresh();
812
813 /* This lets us now how our LECs are doing */
814 err = register_netdevice_notifier(&mpoa_notifier);
815 if (err < 0) {
816 del_timer(&mpc_timer);
817 return err;
818 }
819 }
820
821 mpc = find_mpc_by_itfnum(arg);
822 if (mpc == NULL) {
823 dprintk("allocating new mpc for itf %d\n", arg);
824 mpc = alloc_mpc();
825 if (mpc == NULL)
826 return -ENOMEM;
827 mpc->dev_num = arg;
828 mpc->dev = find_lec_by_itfnum(arg);
829 /* NULL if there was no lec */
830 }
831 if (mpc->mpoad_vcc) {
832 pr_info("mpoad is already present for itf %d\n", arg);
833 return -EADDRINUSE;
834 }
835
836 if (mpc->dev) { /* check if the lec is LANE2 capable */
837 priv = netdev_priv(mpc->dev);
838 if (priv->lane_version < 2) {
839 dev_put(mpc->dev);
840 mpc->dev = NULL;
841 } else
842 priv->lane2_ops->associate_indicator = lane2_assoc_ind;
843 }
844
845 mpc->mpoad_vcc = vcc;
846 vcc->dev = &mpc_dev;
847 vcc_insert_socket(sk_atm(vcc));
848 set_bit(ATM_VF_META, &vcc->flags);
849 set_bit(ATM_VF_READY, &vcc->flags);
850
851 if (mpc->dev) {
852 char empty[ATM_ESA_LEN];
853 memset(empty, 0, ATM_ESA_LEN);
854
855 start_mpc(mpc, mpc->dev);
856 /* set address if mpcd e.g. gets killed and restarted.
857 * If we do not do it now we have to wait for the next LE_ARP
858 */
859 if (memcmp(mpc->mps_ctrl_addr, empty, ATM_ESA_LEN) != 0)
860 send_set_mps_ctrl_addr(mpc->mps_ctrl_addr, mpc);
861 }
862
863 __module_get(THIS_MODULE);
864 return arg;
865 }
866
867 static void send_set_mps_ctrl_addr(const char *addr, struct mpoa_client *mpc)
868 {
869 struct k_message mesg;
870
871 memcpy(mpc->mps_ctrl_addr, addr, ATM_ESA_LEN);
872
873 mesg.type = SET_MPS_CTRL_ADDR;
874 memcpy(mesg.MPS_ctrl, addr, ATM_ESA_LEN);
875 msg_to_mpoad(&mesg, mpc);
876
877 return;
878 }
879
880 static void mpoad_close(struct atm_vcc *vcc)
881 {
882 struct mpoa_client *mpc;
883 struct sk_buff *skb;
884
885 mpc = find_mpc_by_vcc(vcc);
886 if (mpc == NULL) {
887 pr_info("did not find MPC\n");
888 return;
889 }
890 if (!mpc->mpoad_vcc) {
891 pr_info("close for non-present mpoad\n");
892 return;
893 }
894
895 mpc->mpoad_vcc = NULL;
896 if (mpc->dev) {
897 struct lec_priv *priv = netdev_priv(mpc->dev);
898 priv->lane2_ops->associate_indicator = NULL;
899 stop_mpc(mpc);
900 dev_put(mpc->dev);
901 }
902
903 mpc->in_ops->destroy_cache(mpc);
904 mpc->eg_ops->destroy_cache(mpc);
905
906 while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue))) {
907 atm_return(vcc, skb->truesize);
908 kfree_skb(skb);
909 }
910
911 pr_info("(%s) going down\n",
912 (mpc->dev) ? mpc->dev->name : "<unknown>");
913 module_put(THIS_MODULE);
914
915 return;
916 }
917
918 /*
919 *
920 */
921 static int msg_from_mpoad(struct atm_vcc *vcc, struct sk_buff *skb)
922 {
923
924 struct mpoa_client *mpc = find_mpc_by_vcc(vcc);
925 struct k_message *mesg = (struct k_message *)skb->data;
926 atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
927
928 if (mpc == NULL) {
929 pr_info("no mpc found\n");
930 return 0;
931 }
932 dprintk("(%s)", mpc->dev ? mpc->dev->name : "<unknown>");
933 switch (mesg->type) {
934 case MPOA_RES_REPLY_RCVD:
935 dprintk_cont("mpoa_res_reply_rcvd\n");
936 MPOA_res_reply_rcvd(mesg, mpc);
937 break;
938 case MPOA_TRIGGER_RCVD:
939 dprintk_cont("mpoa_trigger_rcvd\n");
940 MPOA_trigger_rcvd(mesg, mpc);
941 break;
942 case INGRESS_PURGE_RCVD:
943 dprintk_cont("nhrp_purge_rcvd\n");
944 ingress_purge_rcvd(mesg, mpc);
945 break;
946 case EGRESS_PURGE_RCVD:
947 dprintk_cont("egress_purge_reply_rcvd\n");
948 egress_purge_rcvd(mesg, mpc);
949 break;
950 case MPS_DEATH:
951 dprintk_cont("mps_death\n");
952 mps_death(mesg, mpc);
953 break;
954 case CACHE_IMPOS_RCVD:
955 dprintk_cont("cache_impos_rcvd\n");
956 MPOA_cache_impos_rcvd(mesg, mpc);
957 break;
958 case SET_MPC_CTRL_ADDR:
959 dprintk_cont("set_mpc_ctrl_addr\n");
960 set_mpc_ctrl_addr_rcvd(mesg, mpc);
961 break;
962 case SET_MPS_MAC_ADDR:
963 dprintk_cont("set_mps_mac_addr\n");
964 set_mps_mac_addr_rcvd(mesg, mpc);
965 break;
966 case CLEAN_UP_AND_EXIT:
967 dprintk_cont("clean_up_and_exit\n");
968 clean_up(mesg, mpc, DIE);
969 break;
970 case RELOAD:
971 dprintk_cont("reload\n");
972 clean_up(mesg, mpc, RELOAD);
973 break;
974 case SET_MPC_PARAMS:
975 dprintk_cont("set_mpc_params\n");
976 mpc->parameters = mesg->content.params;
977 break;
978 default:
979 dprintk_cont("unknown message %d\n", mesg->type);
980 break;
981 }
982 kfree_skb(skb);
983
984 return 0;
985 }
986
987 /* Remember that this function may not do things that sleep */
988 int msg_to_mpoad(struct k_message *mesg, struct mpoa_client *mpc)
989 {
990 struct sk_buff *skb;
991 struct sock *sk;
992
993 if (mpc == NULL || !mpc->mpoad_vcc) {
994 pr_info("mesg %d to a non-existent mpoad\n", mesg->type);
995 return -ENXIO;
996 }
997
998 skb = alloc_skb(sizeof(struct k_message), GFP_ATOMIC);
999 if (skb == NULL)
1000 return -ENOMEM;
1001 skb_put(skb, sizeof(struct k_message));
1002 skb_copy_to_linear_data(skb, mesg, sizeof(*mesg));
1003 atm_force_charge(mpc->mpoad_vcc, skb->truesize);
1004
1005 sk = sk_atm(mpc->mpoad_vcc);
1006 skb_queue_tail(&sk->sk_receive_queue, skb);
1007 sk->sk_data_ready(sk, skb->len);
1008
1009 return 0;
1010 }
1011
1012 static int mpoa_event_listener(struct notifier_block *mpoa_notifier,
1013 unsigned long event, void *dev_ptr)
1014 {
1015 struct net_device *dev;
1016 struct mpoa_client *mpc;
1017 struct lec_priv *priv;
1018
1019 dev = (struct net_device *)dev_ptr;
1020
1021 if (!net_eq(dev_net(dev), &init_net))
1022 return NOTIFY_DONE;
1023
1024 if (dev->name == NULL || strncmp(dev->name, "lec", 3))
1025 return NOTIFY_DONE; /* we are only interested in lec:s */
1026
1027 switch (event) {
1028 case NETDEV_REGISTER: /* a new lec device was allocated */
1029 priv = netdev_priv(dev);
1030 if (priv->lane_version < 2)
1031 break;
1032 priv->lane2_ops->associate_indicator = lane2_assoc_ind;
1033 mpc = find_mpc_by_itfnum(priv->itfnum);
1034 if (mpc == NULL) {
1035 dprintk("allocating new mpc for %s\n", dev->name);
1036 mpc = alloc_mpc();
1037 if (mpc == NULL) {
1038 pr_info("no new mpc");
1039 break;
1040 }
1041 }
1042 mpc->dev_num = priv->itfnum;
1043 mpc->dev = dev;
1044 dev_hold(dev);
1045 dprintk("(%s) was initialized\n", dev->name);
1046 break;
1047 case NETDEV_UNREGISTER:
1048 /* the lec device was deallocated */
1049 mpc = find_mpc_by_lec(dev);
1050 if (mpc == NULL)
1051 break;
1052 dprintk("device (%s) was deallocated\n", dev->name);
1053 stop_mpc(mpc);
1054 dev_put(mpc->dev);
1055 mpc->dev = NULL;
1056 break;
1057 case NETDEV_UP:
1058 /* the dev was ifconfig'ed up */
1059 mpc = find_mpc_by_lec(dev);
1060 if (mpc == NULL)
1061 break;
1062 if (mpc->mpoad_vcc != NULL)
1063 start_mpc(mpc, dev);
1064 break;
1065 case NETDEV_DOWN:
1066 /* the dev was ifconfig'ed down */
1067 /* this means that the flow of packets from the
1068 * upper layer stops
1069 */
1070 mpc = find_mpc_by_lec(dev);
1071 if (mpc == NULL)
1072 break;
1073 if (mpc->mpoad_vcc != NULL)
1074 stop_mpc(mpc);
1075 break;
1076 case NETDEV_REBOOT:
1077 case NETDEV_CHANGE:
1078 case NETDEV_CHANGEMTU:
1079 case NETDEV_CHANGEADDR:
1080 case NETDEV_GOING_DOWN:
1081 break;
1082 default:
1083 break;
1084 }
1085
1086 return NOTIFY_DONE;
1087 }
1088
1089 /*
1090 * Functions which are called after a message is received from mpcd.
1091 * Msg is reused on purpose.
1092 */
1093
1094
1095 static void MPOA_trigger_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1096 {
1097 __be32 dst_ip = msg->content.in_info.in_dst_ip;
1098 in_cache_entry *entry;
1099
1100 entry = mpc->in_ops->get(dst_ip, mpc);
1101 if (entry == NULL) {
1102 entry = mpc->in_ops->add_entry(dst_ip, mpc);
1103 entry->entry_state = INGRESS_RESOLVING;
1104 msg->type = SND_MPOA_RES_RQST;
1105 msg->content.in_info = entry->ctrl_info;
1106 msg_to_mpoad(msg, mpc);
1107 do_gettimeofday(&(entry->reply_wait));
1108 mpc->in_ops->put(entry);
1109 return;
1110 }
1111
1112 if (entry->entry_state == INGRESS_INVALID) {
1113 entry->entry_state = INGRESS_RESOLVING;
1114 msg->type = SND_MPOA_RES_RQST;
1115 msg->content.in_info = entry->ctrl_info;
1116 msg_to_mpoad(msg, mpc);
1117 do_gettimeofday(&(entry->reply_wait));
1118 mpc->in_ops->put(entry);
1119 return;
1120 }
1121
1122 pr_info("(%s) entry already in resolving state\n",
1123 (mpc->dev) ? mpc->dev->name : "<unknown>");
1124 mpc->in_ops->put(entry);
1125 return;
1126 }
1127
1128 /*
1129 * Things get complicated because we have to check if there's an egress
1130 * shortcut with suitable traffic parameters we could use.
1131 */
1132 static void check_qos_and_open_shortcut(struct k_message *msg,
1133 struct mpoa_client *client,
1134 in_cache_entry *entry)
1135 {
1136 __be32 dst_ip = msg->content.in_info.in_dst_ip;
1137 struct atm_mpoa_qos *qos = atm_mpoa_search_qos(dst_ip);
1138 eg_cache_entry *eg_entry = client->eg_ops->get_by_src_ip(dst_ip, client);
1139
1140 if (eg_entry && eg_entry->shortcut) {
1141 if (eg_entry->shortcut->qos.txtp.traffic_class &
1142 msg->qos.txtp.traffic_class &
1143 (qos ? qos->qos.txtp.traffic_class : ATM_UBR | ATM_CBR)) {
1144 if (eg_entry->shortcut->qos.txtp.traffic_class == ATM_UBR)
1145 entry->shortcut = eg_entry->shortcut;
1146 else if (eg_entry->shortcut->qos.txtp.max_pcr > 0)
1147 entry->shortcut = eg_entry->shortcut;
1148 }
1149 if (entry->shortcut) {
1150 dprintk("(%s) using egress SVC to reach %pI4\n",
1151 client->dev->name, &dst_ip);
1152 client->eg_ops->put(eg_entry);
1153 return;
1154 }
1155 }
1156 if (eg_entry != NULL)
1157 client->eg_ops->put(eg_entry);
1158
1159 /* No luck in the egress cache we must open an ingress SVC */
1160 msg->type = OPEN_INGRESS_SVC;
1161 if (qos &&
1162 (qos->qos.txtp.traffic_class == msg->qos.txtp.traffic_class)) {
1163 msg->qos = qos->qos;
1164 pr_info("(%s) trying to get a CBR shortcut\n",
1165 client->dev->name);
1166 } else
1167 memset(&msg->qos, 0, sizeof(struct atm_qos));
1168 msg_to_mpoad(msg, client);
1169 return;
1170 }
1171
1172 static void MPOA_res_reply_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1173 {
1174 __be32 dst_ip = msg->content.in_info.in_dst_ip;
1175 in_cache_entry *entry = mpc->in_ops->get(dst_ip, mpc);
1176
1177 dprintk("(%s) ip %pI4\n",
1178 mpc->dev->name, &dst_ip);
1179 ddprintk("(%s) entry = %p",
1180 mpc->dev->name, entry);
1181 if (entry == NULL) {
1182 pr_info("(%s) ARGH, received res. reply for an entry that doesn't exist.\n",
1183 mpc->dev->name);
1184 return;
1185 }
1186 ddprintk_cont(" entry_state = %d ", entry->entry_state);
1187
1188 if (entry->entry_state == INGRESS_RESOLVED) {
1189 pr_info("(%s) RESOLVED entry!\n", mpc->dev->name);
1190 mpc->in_ops->put(entry);
1191 return;
1192 }
1193
1194 entry->ctrl_info = msg->content.in_info;
1195 do_gettimeofday(&(entry->tv));
1196 do_gettimeofday(&(entry->reply_wait)); /* Used in refreshing func from now on */
1197 entry->refresh_time = 0;
1198 ddprintk_cont("entry->shortcut = %p\n", entry->shortcut);
1199
1200 if (entry->entry_state == INGRESS_RESOLVING &&
1201 entry->shortcut != NULL) {
1202 entry->entry_state = INGRESS_RESOLVED;
1203 mpc->in_ops->put(entry);
1204 return; /* Shortcut already open... */
1205 }
1206
1207 if (entry->shortcut != NULL) {
1208 pr_info("(%s) entry->shortcut != NULL, impossible!\n",
1209 mpc->dev->name);
1210 mpc->in_ops->put(entry);
1211 return;
1212 }
1213
1214 check_qos_and_open_shortcut(msg, mpc, entry);
1215 entry->entry_state = INGRESS_RESOLVED;
1216 mpc->in_ops->put(entry);
1217
1218 return;
1219
1220 }
1221
1222 static void ingress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1223 {
1224 __be32 dst_ip = msg->content.in_info.in_dst_ip;
1225 __be32 mask = msg->ip_mask;
1226 in_cache_entry *entry = mpc->in_ops->get_with_mask(dst_ip, mpc, mask);
1227
1228 if (entry == NULL) {
1229 pr_info("(%s) purge for a non-existing entry, ip = %pI4\n",
1230 mpc->dev->name, &dst_ip);
1231 return;
1232 }
1233
1234 do {
1235 dprintk("(%s) removing an ingress entry, ip = %pI4\n",
1236 mpc->dev->name, &dst_ip);
1237 write_lock_bh(&mpc->ingress_lock);
1238 mpc->in_ops->remove_entry(entry, mpc);
1239 write_unlock_bh(&mpc->ingress_lock);
1240 mpc->in_ops->put(entry);
1241 entry = mpc->in_ops->get_with_mask(dst_ip, mpc, mask);
1242 } while (entry != NULL);
1243
1244 return;
1245 }
1246
1247 static void egress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1248 {
1249 __be32 cache_id = msg->content.eg_info.cache_id;
1250 eg_cache_entry *entry = mpc->eg_ops->get_by_cache_id(cache_id, mpc);
1251
1252 if (entry == NULL) {
1253 dprintk("(%s) purge for a non-existing entry\n",
1254 mpc->dev->name);
1255 return;
1256 }
1257
1258 write_lock_irq(&mpc->egress_lock);
1259 mpc->eg_ops->remove_entry(entry, mpc);
1260 write_unlock_irq(&mpc->egress_lock);
1261
1262 mpc->eg_ops->put(entry);
1263
1264 return;
1265 }
1266
1267 static void purge_egress_shortcut(struct atm_vcc *vcc, eg_cache_entry *entry)
1268 {
1269 struct sock *sk;
1270 struct k_message *purge_msg;
1271 struct sk_buff *skb;
1272
1273 dprintk("entering\n");
1274 if (vcc == NULL) {
1275 pr_info("vcc == NULL\n");
1276 return;
1277 }
1278
1279 skb = alloc_skb(sizeof(struct k_message), GFP_ATOMIC);
1280 if (skb == NULL) {
1281 pr_info("out of memory\n");
1282 return;
1283 }
1284
1285 skb_put(skb, sizeof(struct k_message));
1286 memset(skb->data, 0, sizeof(struct k_message));
1287 purge_msg = (struct k_message *)skb->data;
1288 purge_msg->type = DATA_PLANE_PURGE;
1289 if (entry != NULL)
1290 purge_msg->content.eg_info = entry->ctrl_info;
1291
1292 atm_force_charge(vcc, skb->truesize);
1293
1294 sk = sk_atm(vcc);
1295 skb_queue_tail(&sk->sk_receive_queue, skb);
1296 sk->sk_data_ready(sk, skb->len);
1297 dprintk("exiting\n");
1298
1299 return;
1300 }
1301
1302 /*
1303 * Our MPS died. Tell our daemon to send NHRP data plane purge to each
1304 * of the egress shortcuts we have.
1305 */
1306 static void mps_death(struct k_message *msg, struct mpoa_client *mpc)
1307 {
1308 eg_cache_entry *entry;
1309
1310 dprintk("(%s)\n", mpc->dev->name);
1311
1312 if (memcmp(msg->MPS_ctrl, mpc->mps_ctrl_addr, ATM_ESA_LEN)) {
1313 pr_info("(%s) wrong MPS\n", mpc->dev->name);
1314 return;
1315 }
1316
1317 /* FIXME: This knows too much of the cache structure */
1318 read_lock_irq(&mpc->egress_lock);
1319 entry = mpc->eg_cache;
1320 while (entry != NULL) {
1321 purge_egress_shortcut(entry->shortcut, entry);
1322 entry = entry->next;
1323 }
1324 read_unlock_irq(&mpc->egress_lock);
1325
1326 mpc->in_ops->destroy_cache(mpc);
1327 mpc->eg_ops->destroy_cache(mpc);
1328
1329 return;
1330 }
1331
1332 static void MPOA_cache_impos_rcvd(struct k_message *msg,
1333 struct mpoa_client *mpc)
1334 {
1335 uint16_t holding_time;
1336 eg_cache_entry *entry = mpc->eg_ops->get_by_cache_id(msg->content.eg_info.cache_id, mpc);
1337
1338 holding_time = msg->content.eg_info.holding_time;
1339 dprintk("(%s) entry = %p, holding_time = %u\n",
1340 mpc->dev->name, entry, holding_time);
1341 if (entry == NULL && holding_time) {
1342 entry = mpc->eg_ops->add_entry(msg, mpc);
1343 mpc->eg_ops->put(entry);
1344 return;
1345 }
1346 if (holding_time) {
1347 mpc->eg_ops->update(entry, holding_time);
1348 return;
1349 }
1350
1351 write_lock_irq(&mpc->egress_lock);
1352 mpc->eg_ops->remove_entry(entry, mpc);
1353 write_unlock_irq(&mpc->egress_lock);
1354
1355 mpc->eg_ops->put(entry);
1356
1357 return;
1358 }
1359
1360 static void set_mpc_ctrl_addr_rcvd(struct k_message *mesg,
1361 struct mpoa_client *mpc)
1362 {
1363 struct lec_priv *priv;
1364 int i, retval ;
1365
1366 uint8_t tlv[4 + 1 + 1 + 1 + ATM_ESA_LEN];
1367
1368 tlv[0] = 00; tlv[1] = 0xa0; tlv[2] = 0x3e; tlv[3] = 0x2a; /* type */
1369 tlv[4] = 1 + 1 + ATM_ESA_LEN; /* length */
1370 tlv[5] = 0x02; /* MPOA client */
1371 tlv[6] = 0x00; /* number of MPS MAC addresses */
1372
1373 memcpy(&tlv[7], mesg->MPS_ctrl, ATM_ESA_LEN); /* MPC ctrl ATM addr */
1374 memcpy(mpc->our_ctrl_addr, mesg->MPS_ctrl, ATM_ESA_LEN);
1375
1376 dprintk("(%s) setting MPC ctrl ATM address to",
1377 mpc->dev ? mpc->dev->name : "<unknown>");
1378 for (i = 7; i < sizeof(tlv); i++)
1379 dprintk_cont(" %02x", tlv[i]);
1380 dprintk_cont("\n");
1381
1382 if (mpc->dev) {
1383 priv = netdev_priv(mpc->dev);
1384 retval = priv->lane2_ops->associate_req(mpc->dev,
1385 mpc->dev->dev_addr,
1386 tlv, sizeof(tlv));
1387 if (retval == 0)
1388 pr_info("(%s) MPOA device type TLV association failed\n",
1389 mpc->dev->name);
1390 retval = priv->lane2_ops->resolve(mpc->dev, NULL, 1, NULL, NULL);
1391 if (retval < 0)
1392 pr_info("(%s) targetless LE_ARP request failed\n",
1393 mpc->dev->name);
1394 }
1395
1396 return;
1397 }
1398
1399 static void set_mps_mac_addr_rcvd(struct k_message *msg,
1400 struct mpoa_client *client)
1401 {
1402
1403 if (client->number_of_mps_macs)
1404 kfree(client->mps_macs);
1405 client->number_of_mps_macs = 0;
1406 client->mps_macs = kmemdup(msg->MPS_ctrl, ETH_ALEN, GFP_KERNEL);
1407 if (client->mps_macs == NULL) {
1408 pr_info("out of memory\n");
1409 return;
1410 }
1411 client->number_of_mps_macs = 1;
1412
1413 return;
1414 }
1415
1416 /*
1417 * purge egress cache and tell daemon to 'action' (DIE, RELOAD)
1418 */
1419 static void clean_up(struct k_message *msg, struct mpoa_client *mpc, int action)
1420 {
1421
1422 eg_cache_entry *entry;
1423 msg->type = SND_EGRESS_PURGE;
1424
1425
1426 /* FIXME: This knows too much of the cache structure */
1427 read_lock_irq(&mpc->egress_lock);
1428 entry = mpc->eg_cache;
1429 while (entry != NULL) {
1430 msg->content.eg_info = entry->ctrl_info;
1431 dprintk("cache_id %u\n", entry->ctrl_info.cache_id);
1432 msg_to_mpoad(msg, mpc);
1433 entry = entry->next;
1434 }
1435 read_unlock_irq(&mpc->egress_lock);
1436
1437 msg->type = action;
1438 msg_to_mpoad(msg, mpc);
1439 return;
1440 }
1441
1442 static void mpc_timer_refresh(void)
1443 {
1444 mpc_timer.expires = jiffies + (MPC_P2 * HZ);
1445 mpc_timer.data = mpc_timer.expires;
1446 mpc_timer.function = mpc_cache_check;
1447 add_timer(&mpc_timer);
1448
1449 return;
1450 }
1451
1452 static void mpc_cache_check(unsigned long checking_time)
1453 {
1454 struct mpoa_client *mpc = mpcs;
1455 static unsigned long previous_resolving_check_time;
1456 static unsigned long previous_refresh_time;
1457
1458 while (mpc != NULL) {
1459 mpc->in_ops->clear_count(mpc);
1460 mpc->eg_ops->clear_expired(mpc);
1461 if (checking_time - previous_resolving_check_time >
1462 mpc->parameters.mpc_p4 * HZ) {
1463 mpc->in_ops->check_resolving(mpc);
1464 previous_resolving_check_time = checking_time;
1465 }
1466 if (checking_time - previous_refresh_time >
1467 mpc->parameters.mpc_p5 * HZ) {
1468 mpc->in_ops->refresh(mpc);
1469 previous_refresh_time = checking_time;
1470 }
1471 mpc = mpc->next;
1472 }
1473 mpc_timer_refresh();
1474
1475 return;
1476 }
1477
1478 static int atm_mpoa_ioctl(struct socket *sock, unsigned int cmd,
1479 unsigned long arg)
1480 {
1481 int err = 0;
1482 struct atm_vcc *vcc = ATM_SD(sock);
1483
1484 if (cmd != ATMMPC_CTRL && cmd != ATMMPC_DATA)
1485 return -ENOIOCTLCMD;
1486
1487 if (!capable(CAP_NET_ADMIN))
1488 return -EPERM;
1489
1490 switch (cmd) {
1491 case ATMMPC_CTRL:
1492 err = atm_mpoa_mpoad_attach(vcc, (int)arg);
1493 if (err >= 0)
1494 sock->state = SS_CONNECTED;
1495 break;
1496 case ATMMPC_DATA:
1497 err = atm_mpoa_vcc_attach(vcc, (void __user *)arg);
1498 break;
1499 default:
1500 break;
1501 }
1502 return err;
1503 }
1504
1505 static struct atm_ioctl atm_ioctl_ops = {
1506 .owner = THIS_MODULE,
1507 .ioctl = atm_mpoa_ioctl,
1508 };
1509
1510 static __init int atm_mpoa_init(void)
1511 {
1512 register_atm_ioctl(&atm_ioctl_ops);
1513
1514 if (mpc_proc_init() != 0)
1515 pr_info("failed to initialize /proc/mpoa\n");
1516
1517 pr_info("mpc.c: " __DATE__ " " __TIME__ " initialized\n");
1518
1519 return 0;
1520 }
1521
1522 static void __exit atm_mpoa_cleanup(void)
1523 {
1524 struct mpoa_client *mpc, *tmp;
1525 struct atm_mpoa_qos *qos, *nextqos;
1526 struct lec_priv *priv;
1527
1528 mpc_proc_clean();
1529
1530 del_timer(&mpc_timer);
1531 unregister_netdevice_notifier(&mpoa_notifier);
1532 deregister_atm_ioctl(&atm_ioctl_ops);
1533
1534 mpc = mpcs;
1535 mpcs = NULL;
1536 while (mpc != NULL) {
1537 tmp = mpc->next;
1538 if (mpc->dev != NULL) {
1539 stop_mpc(mpc);
1540 priv = netdev_priv(mpc->dev);
1541 if (priv->lane2_ops != NULL)
1542 priv->lane2_ops->associate_indicator = NULL;
1543 }
1544 ddprintk("about to clear caches\n");
1545 mpc->in_ops->destroy_cache(mpc);
1546 mpc->eg_ops->destroy_cache(mpc);
1547 ddprintk("caches cleared\n");
1548 kfree(mpc->mps_macs);
1549 memset(mpc, 0, sizeof(struct mpoa_client));
1550 ddprintk("about to kfree %p\n", mpc);
1551 kfree(mpc);
1552 ddprintk("next mpc is at %p\n", tmp);
1553 mpc = tmp;
1554 }
1555
1556 qos = qos_head;
1557 qos_head = NULL;
1558 while (qos != NULL) {
1559 nextqos = qos->next;
1560 dprintk("freeing qos entry %p\n", qos);
1561 kfree(qos);
1562 qos = nextqos;
1563 }
1564
1565 return;
1566 }
1567
1568 module_init(atm_mpoa_init);
1569 module_exit(atm_mpoa_cleanup);
1570
1571 MODULE_LICENSE("GPL");
Linux ARM platform port for MOXA ART SoC