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SCSI: scsi_dh: check queuedata pointer before proceeding further
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / atm / mpc.c
blob38a6cb0863f052d5557ee4938475a576bc64b632
1 #include <linux/kernel.h>
2 #include <linux/string.h>
3 #include <linux/timer.h>
4 #include <linux/init.h>
5 #include <linux/bitops.h>
6 #include <linux/capability.h>
7 #include <linux/seq_file.h>
8
9 /* We are an ethernet device */
10 #include <linux/if_ether.h>
11 #include <linux/netdevice.h>
12 #include <linux/etherdevice.h>
13 #include <net/sock.h>
14 #include <linux/skbuff.h>
15 #include <linux/ip.h>
16 #include <asm/byteorder.h>
17 #include <asm/uaccess.h>
18 #include <net/checksum.h> /* for ip_fast_csum() */
19 #include <net/arp.h>
20 #include <net/dst.h>
21 #include <linux/proc_fs.h>
22
23 /* And atm device */
24 #include <linux/atmdev.h>
25 #include <linux/atmlec.h>
26 #include <linux/atmmpc.h>
27 /* Modular too */
28 #include <linux/module.h>
29
30 #include "lec.h"
31 #include "mpc.h"
32 #include "resources.h"
33
34 /*
35 * mpc.c: Implementation of MPOA client kernel part
36 */
37
38 #if 0
39 #define dprintk printk /* debug */
40 #else
41 #define dprintk(format,args...)
42 #endif
43
44 #if 0
45 #define ddprintk printk /* more debug */
46 #else
47 #define ddprintk(format,args...)
48 #endif
49
50
51
52 #define MPOA_TAG_LEN 4
53
54 /* mpc_daemon -> kernel */
55 static void MPOA_trigger_rcvd (struct k_message *msg, struct mpoa_client *mpc);
56 static void MPOA_res_reply_rcvd(struct k_message *msg, struct mpoa_client *mpc);
57 static void ingress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc);
58 static void egress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc);
59 static void mps_death(struct k_message *msg, struct mpoa_client *mpc);
60 static void clean_up(struct k_message *msg, struct mpoa_client *mpc, int action);
61 static void MPOA_cache_impos_rcvd(struct k_message *msg, struct mpoa_client *mpc);
62 static void set_mpc_ctrl_addr_rcvd(struct k_message *mesg, struct mpoa_client *mpc);
63 static void set_mps_mac_addr_rcvd(struct k_message *mesg, struct mpoa_client *mpc);
64
65 static const uint8_t *copy_macs(struct mpoa_client *mpc,
66 const uint8_t *router_mac,
67 const uint8_t *tlvs, uint8_t mps_macs,
68 uint8_t device_type);
69 static void purge_egress_shortcut(struct atm_vcc *vcc, eg_cache_entry *entry);
70
71 static void send_set_mps_ctrl_addr(const char *addr, struct mpoa_client *mpc);
72 static void mpoad_close(struct atm_vcc *vcc);
73 static int msg_from_mpoad(struct atm_vcc *vcc, struct sk_buff *skb);
74
75 static void mpc_push(struct atm_vcc *vcc, struct sk_buff *skb);
76 static netdev_tx_t mpc_send_packet(struct sk_buff *skb,
77 struct net_device *dev);
78 static int mpoa_event_listener(struct notifier_block *mpoa_notifier, unsigned long event, void *dev);
79 static void mpc_timer_refresh(void);
80 static void mpc_cache_check( unsigned long checking_time );
81
82 static struct llc_snap_hdr llc_snap_mpoa_ctrl = {
83 0xaa, 0xaa, 0x03,
84 {0x00, 0x00, 0x5e},
85 {0x00, 0x03} /* For MPOA control PDUs */
86 };
87 static struct llc_snap_hdr llc_snap_mpoa_data = {
88 0xaa, 0xaa, 0x03,
89 {0x00, 0x00, 0x00},
90 {0x08, 0x00} /* This is for IP PDUs only */
91 };
92 static struct llc_snap_hdr llc_snap_mpoa_data_tagged = {
93 0xaa, 0xaa, 0x03,
94 {0x00, 0x00, 0x00},
95 {0x88, 0x4c} /* This is for tagged data PDUs */
96 };
97
98 static struct notifier_block mpoa_notifier = {
99 mpoa_event_listener,
100 NULL,
101 0
102 };
103
104 struct mpoa_client *mpcs = NULL; /* FIXME */
105 static struct atm_mpoa_qos *qos_head = NULL;
106 static DEFINE_TIMER(mpc_timer, NULL, 0, 0);
107
108
109 static struct mpoa_client *find_mpc_by_itfnum(int itf)
110 {
111 struct mpoa_client *mpc;
112
113 mpc = mpcs; /* our global linked list */
114 while (mpc != NULL) {
115 if (mpc->dev_num == itf)
116 return mpc;
117 mpc = mpc->next;
118 }
119
120 return NULL; /* not found */
121 }
122
123 static struct mpoa_client *find_mpc_by_vcc(struct atm_vcc *vcc)
124 {
125 struct mpoa_client *mpc;
126
127 mpc = mpcs; /* our global linked list */
128 while (mpc != NULL) {
129 if (mpc->mpoad_vcc == vcc)
130 return mpc;
131 mpc = mpc->next;
132 }
133
134 return NULL; /* not found */
135 }
136
137 static struct mpoa_client *find_mpc_by_lec(struct net_device *dev)
138 {
139 struct mpoa_client *mpc;
140
141 mpc = mpcs; /* our global linked list */
142 while (mpc != NULL) {
143 if (mpc->dev == dev)
144 return mpc;
145 mpc = mpc->next;
146 }
147
148 return NULL; /* not found */
149 }
150
151 /*
152 * Functions for managing QoS list
153 */
154
155 /*
156 * Overwrites the old entry or makes a new one.
157 */
158 struct atm_mpoa_qos *atm_mpoa_add_qos(__be32 dst_ip, struct atm_qos *qos)
159 {
160 struct atm_mpoa_qos *entry;
161
162 entry = atm_mpoa_search_qos(dst_ip);
163 if (entry != NULL) {
164 entry->qos = *qos;
165 return entry;
166 }
167
168 entry = kmalloc(sizeof(struct atm_mpoa_qos), GFP_KERNEL);
169 if (entry == NULL) {
170 printk("mpoa: atm_mpoa_add_qos: out of memory\n");
171 return entry;
172 }
173
174 entry->ipaddr = dst_ip;
175 entry->qos = *qos;
176
177 entry->next = qos_head;
178 qos_head = entry;
179
180 return entry;
181 }
182
183 struct atm_mpoa_qos *atm_mpoa_search_qos(__be32 dst_ip)
184 {
185 struct atm_mpoa_qos *qos;
186
187 qos = qos_head;
188 while( qos != NULL ){
189 if(qos->ipaddr == dst_ip) {
190 break;
191 }
192 qos = qos->next;
193 }
194
195 return qos;
196 }
197
198 /*
199 * Returns 0 for failure
200 */
201 int atm_mpoa_delete_qos(struct atm_mpoa_qos *entry)
202 {
203
204 struct atm_mpoa_qos *curr;
205
206 if (entry == NULL) return 0;
207 if (entry == qos_head) {
208 qos_head = qos_head->next;
209 kfree(entry);
210 return 1;
211 }
212
213 curr = qos_head;
214 while (curr != NULL) {
215 if (curr->next == entry) {
216 curr->next = entry->next;
217 kfree(entry);
218 return 1;
219 }
220 curr = curr->next;
221 }
222
223 return 0;
224 }
225
226 /* this is buggered - we need locking for qos_head */
227 void atm_mpoa_disp_qos(struct seq_file *m)
228 {
229 struct atm_mpoa_qos *qos;
230
231 qos = qos_head;
232 seq_printf(m, "QoS entries for shortcuts:\n");
233 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");
234
235 while (qos != NULL) {
236 seq_printf(m, "%pI4\n %-7d %-7d %-7d %-7d %-7d\n %-7d %-7d %-7d %-7d %-7d\n",
237 &qos->ipaddr,
238 qos->qos.txtp.max_pcr, qos->qos.txtp.pcr, qos->qos.txtp.min_pcr, qos->qos.txtp.max_cdv, qos->qos.txtp.max_sdu,
239 qos->qos.rxtp.max_pcr, qos->qos.rxtp.pcr, qos->qos.rxtp.min_pcr, qos->qos.rxtp.max_cdv, qos->qos.rxtp.max_sdu);
240 qos = qos->next;
241 }
242 }
243
244 static struct net_device *find_lec_by_itfnum(int itf)
245 {
246 struct net_device *dev;
247 char name[IFNAMSIZ];
248
249 sprintf(name, "lec%d", itf);
250 dev = dev_get_by_name(&init_net, name);
251
252 return dev;
253 }
254
255 static struct mpoa_client *alloc_mpc(void)
256 {
257 struct mpoa_client *mpc;
258
259 mpc = kzalloc(sizeof (struct mpoa_client), GFP_KERNEL);
260 if (mpc == NULL)
261 return NULL;
262 rwlock_init(&mpc->ingress_lock);
263 rwlock_init(&mpc->egress_lock);
264 mpc->next = mpcs;
265 atm_mpoa_init_cache(mpc);
266
267 mpc->parameters.mpc_p1 = MPC_P1;
268 mpc->parameters.mpc_p2 = MPC_P2;
269 memset(mpc->parameters.mpc_p3,0,sizeof(mpc->parameters.mpc_p3));
270 mpc->parameters.mpc_p4 = MPC_P4;
271 mpc->parameters.mpc_p5 = MPC_P5;
272 mpc->parameters.mpc_p6 = MPC_P6;
273
274 mpcs = mpc;
275
276 return mpc;
277 }
278
279 /*
280 *
281 * start_mpc() puts the MPC on line. All the packets destined
282 * to the lec underneath us are now being monitored and
283 * shortcuts will be established.
284 *
285 */
286 static void start_mpc(struct mpoa_client *mpc, struct net_device *dev)
287 {
288
289 dprintk("mpoa: (%s) start_mpc:\n", mpc->dev->name);
290 if (!dev->netdev_ops)
291 printk("mpoa: (%s) start_mpc not starting\n", dev->name);
292 else {
293 mpc->old_ops = dev->netdev_ops;
294 mpc->new_ops = *mpc->old_ops;
295 mpc->new_ops.ndo_start_xmit = mpc_send_packet;
296 dev->netdev_ops = &mpc->new_ops;
297 }
298 }
299
300 static void stop_mpc(struct mpoa_client *mpc)
301 {
302 struct net_device *dev = mpc->dev;
303 dprintk("mpoa: (%s) stop_mpc:", mpc->dev->name);
304
305 /* Lets not nullify lec device's dev->hard_start_xmit */
306 if (dev->netdev_ops != &mpc->new_ops) {
307 dprintk(" mpc already stopped, not fatal\n");
308 return;
309 }
310 dprintk("\n");
311
312 dev->netdev_ops = mpc->old_ops;
313 mpc->old_ops = NULL;
314
315 /* close_shortcuts(mpc); ??? FIXME */
316 }
317
318 static const char *mpoa_device_type_string(char type) __attribute__ ((unused));
319
320 static const char *mpoa_device_type_string(char type)
321 {
322 switch(type) {
323 case NON_MPOA:
324 return "non-MPOA device";
325 break;
326 case MPS:
327 return "MPS";
328 break;
329 case MPC:
330 return "MPC";
331 break;
332 case MPS_AND_MPC:
333 return "both MPS and MPC";
334 break;
335 default:
336 return "unspecified (non-MPOA) device";
337 break;
338 }
339
340 return ""; /* not reached */
341 }
342
343 /*
344 * lec device calls this via its netdev_priv(dev)->lane2_ops
345 * ->associate_indicator() when it sees a TLV in LE_ARP packet.
346 * We fill in the pointer above when we see a LANE2 lec initializing
347 * See LANE2 spec 3.1.5
348 *
349 * Quite a big and ugly function but when you look at it
350 * all it does is to try to locate and parse MPOA Device
351 * Type TLV.
352 * We give our lec a pointer to this function and when the
353 * lec sees a TLV it uses the pointer to call this function.
354 *
355 */
356 static void lane2_assoc_ind(struct net_device *dev, const u8 *mac_addr,
357 const u8 *tlvs, u32 sizeoftlvs)
358 {
359 uint32_t type;
360 uint8_t length, mpoa_device_type, number_of_mps_macs;
361 const uint8_t *end_of_tlvs;
362 struct mpoa_client *mpc;
363
364 mpoa_device_type = number_of_mps_macs = 0; /* silence gcc */
365 dprintk("mpoa: (%s) lane2_assoc_ind: received TLV(s), ", dev->name);
366 dprintk("total length of all TLVs %d\n", sizeoftlvs);
367 mpc = find_mpc_by_lec(dev); /* Sampo-Fix: moved here from below */
368 if (mpc == NULL) {
369 printk("mpoa: (%s) lane2_assoc_ind: no mpc\n", dev->name);
370 return;
371 }
372 end_of_tlvs = tlvs + sizeoftlvs;
373 while (end_of_tlvs - tlvs >= 5) {
374 type = (tlvs[0] << 24) | (tlvs[1] << 16) | (tlvs[2] << 8) | tlvs[3];
375 length = tlvs[4];
376 tlvs += 5;
377 dprintk(" type 0x%x length %02x\n", type, length);
378 if (tlvs + length > end_of_tlvs) {
379 printk("TLV value extends past its buffer, aborting parse\n");
380 return;
381 }
382
383 if (type == 0) {
384 printk("mpoa: (%s) lane2_assoc_ind: TLV type was 0, returning\n", dev->name);
385 return;
386 }
387
388 if (type != TLV_MPOA_DEVICE_TYPE) {
389 tlvs += length;
390 continue; /* skip other TLVs */
391 }
392 mpoa_device_type = *tlvs++;
393 number_of_mps_macs = *tlvs++;
394 dprintk("mpoa: (%s) MPOA device type '%s', ", dev->name, mpoa_device_type_string(mpoa_device_type));
395 if (mpoa_device_type == MPS_AND_MPC &&
396 length < (42 + number_of_mps_macs*ETH_ALEN)) { /* :) */
397 printk("\nmpoa: (%s) lane2_assoc_ind: short MPOA Device Type TLV\n",
398 dev->name);
399 continue;
400 }
401 if ((mpoa_device_type == MPS || mpoa_device_type == MPC)
402 && length < 22 + number_of_mps_macs*ETH_ALEN) {
403 printk("\nmpoa: (%s) lane2_assoc_ind: short MPOA Device Type TLV\n",
404 dev->name);
405 continue;
406 }
407 if (mpoa_device_type != MPS && mpoa_device_type != MPS_AND_MPC) {
408 dprintk("ignoring non-MPS device\n");
409 if (mpoa_device_type == MPC) tlvs += 20;
410 continue; /* we are only interested in MPSs */
411 }
412 if (number_of_mps_macs == 0 && mpoa_device_type == MPS_AND_MPC) {
413 printk("\nmpoa: (%s) lane2_assoc_ind: MPS_AND_MPC has zero MACs\n", dev->name);
414 continue; /* someone should read the spec */
415 }
416 dprintk("this MPS has %d MAC addresses\n", number_of_mps_macs);
417
418 /* ok, now we can go and tell our daemon the control address of MPS */
419 send_set_mps_ctrl_addr(tlvs, mpc);
420
421 tlvs = copy_macs(mpc, mac_addr, tlvs, number_of_mps_macs, mpoa_device_type);
422 if (tlvs == NULL) return;
423 }
424 if (end_of_tlvs - tlvs != 0)
425 printk("mpoa: (%s) lane2_assoc_ind: ignoring %Zd bytes of trailing TLV carbage\n",
426 dev->name, end_of_tlvs - tlvs);
427 return;
428 }
429
430 /*
431 * Store at least advertizing router's MAC address
432 * plus the possible MAC address(es) to mpc->mps_macs.
433 * For a freshly allocated MPOA client mpc->mps_macs == 0.
434 */
435 static const uint8_t *copy_macs(struct mpoa_client *mpc,
436 const uint8_t *router_mac,
437 const uint8_t *tlvs, uint8_t mps_macs,
438 uint8_t device_type)
439 {
440 int num_macs;
441 num_macs = (mps_macs > 1) ? mps_macs : 1;
442
443 if (mpc->number_of_mps_macs != num_macs) { /* need to reallocate? */
444 if (mpc->number_of_mps_macs != 0) kfree(mpc->mps_macs);
445 mpc->number_of_mps_macs = 0;
446 mpc->mps_macs = kmalloc(num_macs*ETH_ALEN, GFP_KERNEL);
447 if (mpc->mps_macs == NULL) {
448 printk("mpoa: (%s) copy_macs: out of mem\n", mpc->dev->name);
449 return NULL;
450 }
451 }
452 memcpy(mpc->mps_macs, router_mac, ETH_ALEN);
453 tlvs += 20; if (device_type == MPS_AND_MPC) tlvs += 20;
454 if (mps_macs > 0)
455 memcpy(mpc->mps_macs, tlvs, mps_macs*ETH_ALEN);
456 tlvs += mps_macs*ETH_ALEN;
457 mpc->number_of_mps_macs = num_macs;
458
459 return tlvs;
460 }
461
462 static int send_via_shortcut(struct sk_buff *skb, struct mpoa_client *mpc)
463 {
464 in_cache_entry *entry;
465 struct iphdr *iph;
466 char *buff;
467 __be32 ipaddr = 0;
468
469 static struct {
470 struct llc_snap_hdr hdr;
471 __be32 tag;
472 } tagged_llc_snap_hdr = {
473 {0xaa, 0xaa, 0x03, {0x00, 0x00, 0x00}, {0x88, 0x4c}},
474 0
475 };
476
477 buff = skb->data + mpc->dev->hard_header_len;
478 iph = (struct iphdr *)buff;
479 ipaddr = iph->daddr;
480
481 ddprintk("mpoa: (%s) send_via_shortcut: ipaddr 0x%x\n", mpc->dev->name, ipaddr);
482
483 entry = mpc->in_ops->get(ipaddr, mpc);
484 if (entry == NULL) {
485 entry = mpc->in_ops->add_entry(ipaddr, mpc);
486 if (entry != NULL) mpc->in_ops->put(entry);
487 return 1;
488 }
489 if (mpc->in_ops->cache_hit(entry, mpc) != OPEN){ /* threshold not exceeded or VCC not ready */
490 ddprintk("mpoa: (%s) send_via_shortcut: cache_hit: returns != OPEN\n", mpc->dev->name);
491 mpc->in_ops->put(entry);
492 return 1;
493 }
494
495 ddprintk("mpoa: (%s) send_via_shortcut: using shortcut\n", mpc->dev->name);
496 /* MPOA spec A.1.4, MPOA client must decrement IP ttl at least by one */
497 if (iph->ttl <= 1) {
498 ddprintk("mpoa: (%s) send_via_shortcut: IP ttl = %u, using LANE\n", mpc->dev->name, iph->ttl);
499 mpc->in_ops->put(entry);
500 return 1;
501 }
502 iph->ttl--;
503 iph->check = 0;
504 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
505
506 if (entry->ctrl_info.tag != 0) {
507 ddprintk("mpoa: (%s) send_via_shortcut: adding tag 0x%x\n", mpc->dev->name, entry->ctrl_info.tag);
508 tagged_llc_snap_hdr.tag = entry->ctrl_info.tag;
509 skb_pull(skb, ETH_HLEN); /* get rid of Eth header */
510 skb_push(skb, sizeof(tagged_llc_snap_hdr)); /* add LLC/SNAP header */
511 skb_copy_to_linear_data(skb, &tagged_llc_snap_hdr,
512 sizeof(tagged_llc_snap_hdr));
513 } else {
514 skb_pull(skb, ETH_HLEN); /* get rid of Eth header */
515 skb_push(skb, sizeof(struct llc_snap_hdr)); /* add LLC/SNAP header + tag */
516 skb_copy_to_linear_data(skb, &llc_snap_mpoa_data,
517 sizeof(struct llc_snap_hdr));
518 }
519
520 atomic_add(skb->truesize, &sk_atm(entry->shortcut)->sk_wmem_alloc);
521 ATM_SKB(skb)->atm_options = entry->shortcut->atm_options;
522 entry->shortcut->send(entry->shortcut, skb);
523 entry->packets_fwded++;
524 mpc->in_ops->put(entry);
525
526 return 0;
527 }
528
529 /*
530 * Probably needs some error checks and locking, not sure...
531 */
532 static netdev_tx_t mpc_send_packet(struct sk_buff *skb,
533 struct net_device *dev)
534 {
535 struct mpoa_client *mpc;
536 struct ethhdr *eth;
537 int i = 0;
538
539 mpc = find_mpc_by_lec(dev); /* this should NEVER fail */
540 if(mpc == NULL) {
541 printk("mpoa: (%s) mpc_send_packet: no MPC found\n", dev->name);
542 goto non_ip;
543 }
544
545 eth = (struct ethhdr *)skb->data;
546 if (eth->h_proto != htons(ETH_P_IP))
547 goto non_ip; /* Multi-Protocol Over ATM :-) */
548
549 /* Weed out funny packets (e.g., AF_PACKET or raw). */
550 if (skb->len < ETH_HLEN + sizeof(struct iphdr))
551 goto non_ip;
552 skb_set_network_header(skb, ETH_HLEN);
553 if (skb->len < ETH_HLEN + ip_hdr(skb)->ihl * 4 || ip_hdr(skb)->ihl < 5)
554 goto non_ip;
555
556 while (i < mpc->number_of_mps_macs) {
557 if (!compare_ether_addr(eth->h_dest, (mpc->mps_macs + i*ETH_ALEN)))
558 if ( send_via_shortcut(skb, mpc) == 0 ) /* try shortcut */
559 return NETDEV_TX_OK; /* success! */
560 i++;
561 }
562
563 non_ip:
564 return mpc->old_ops->ndo_start_xmit(skb,dev);
565 }
566
567 static int atm_mpoa_vcc_attach(struct atm_vcc *vcc, void __user *arg)
568 {
569 int bytes_left;
570 struct mpoa_client *mpc;
571 struct atmmpc_ioc ioc_data;
572 in_cache_entry *in_entry;
573 __be32 ipaddr;
574
575 bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmmpc_ioc));
576 if (bytes_left != 0) {
577 printk("mpoa: mpc_vcc_attach: Short read (missed %d bytes) from userland\n", bytes_left);
578 return -EFAULT;
579 }
580 ipaddr = ioc_data.ipaddr;
581 if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF)
582 return -EINVAL;
583
584 mpc = find_mpc_by_itfnum(ioc_data.dev_num);
585 if (mpc == NULL)
586 return -EINVAL;
587
588 if (ioc_data.type == MPC_SOCKET_INGRESS) {
589 in_entry = mpc->in_ops->get(ipaddr, mpc);
590 if (in_entry == NULL || in_entry->entry_state < INGRESS_RESOLVED) {
591 printk("mpoa: (%s) mpc_vcc_attach: did not find RESOLVED entry from ingress cache\n",
592 mpc->dev->name);
593 if (in_entry != NULL) mpc->in_ops->put(in_entry);
594 return -EINVAL;
595 }
596 printk("mpoa: (%s) mpc_vcc_attach: attaching ingress SVC, entry = %pI4\n",
597 mpc->dev->name, &in_entry->ctrl_info.in_dst_ip);
598 in_entry->shortcut = vcc;
599 mpc->in_ops->put(in_entry);
600 } else {
601 printk("mpoa: (%s) mpc_vcc_attach: attaching egress SVC\n", mpc->dev->name);
602 }
603
604 vcc->proto_data = mpc->dev;
605 vcc->push = mpc_push;
606
607 return 0;
608 }
609
610 /*
611 *
612 */
613 static void mpc_vcc_close(struct atm_vcc *vcc, struct net_device *dev)
614 {
615 struct mpoa_client *mpc;
616 in_cache_entry *in_entry;
617 eg_cache_entry *eg_entry;
618
619 mpc = find_mpc_by_lec(dev);
620 if (mpc == NULL) {
621 printk("mpoa: (%s) mpc_vcc_close: close for unknown MPC\n", dev->name);
622 return;
623 }
624
625 dprintk("mpoa: (%s) mpc_vcc_close:\n", dev->name);
626 in_entry = mpc->in_ops->get_by_vcc(vcc, mpc);
627 if (in_entry) {
628 dprintk("mpoa: (%s) mpc_vcc_close: ingress SVC closed ip = %pI4\n",
629 mpc->dev->name, &in_entry->ctrl_info.in_dst_ip);
630 in_entry->shortcut = NULL;
631 mpc->in_ops->put(in_entry);
632 }
633 eg_entry = mpc->eg_ops->get_by_vcc(vcc, mpc);
634 if (eg_entry) {
635 dprintk("mpoa: (%s) mpc_vcc_close: egress SVC closed\n", mpc->dev->name);
636 eg_entry->shortcut = NULL;
637 mpc->eg_ops->put(eg_entry);
638 }
639
640 if (in_entry == NULL && eg_entry == NULL)
641 dprintk("mpoa: (%s) mpc_vcc_close: unused vcc closed\n", dev->name);
642
643 return;
644 }
645
646 static void mpc_push(struct atm_vcc *vcc, struct sk_buff *skb)
647 {
648 struct net_device *dev = (struct net_device *)vcc->proto_data;
649 struct sk_buff *new_skb;
650 eg_cache_entry *eg;
651 struct mpoa_client *mpc;
652 __be32 tag;
653 char *tmp;
654
655 ddprintk("mpoa: (%s) mpc_push:\n", dev->name);
656 if (skb == NULL) {
657 dprintk("mpoa: (%s) mpc_push: null skb, closing VCC\n", dev->name);
658 mpc_vcc_close(vcc, dev);
659 return;
660 }
661
662 skb->dev = dev;
663 if (memcmp(skb->data, &llc_snap_mpoa_ctrl, sizeof(struct llc_snap_hdr)) == 0) {
664 struct sock *sk = sk_atm(vcc);
665
666 dprintk("mpoa: (%s) mpc_push: control packet arrived\n", dev->name);
667 /* Pass control packets to daemon */
668 skb_queue_tail(&sk->sk_receive_queue, skb);
669 sk->sk_data_ready(sk, skb->len);
670 return;
671 }
672
673 /* data coming over the shortcut */
674 atm_return(vcc, skb->truesize);
675
676 mpc = find_mpc_by_lec(dev);
677 if (mpc == NULL) {
678 printk("mpoa: (%s) mpc_push: unknown MPC\n", dev->name);
679 return;
680 }
681
682 if (memcmp(skb->data, &llc_snap_mpoa_data_tagged, sizeof(struct llc_snap_hdr)) == 0) { /* MPOA tagged data */
683 ddprintk("mpoa: (%s) mpc_push: tagged data packet arrived\n", dev->name);
684
685 } else if (memcmp(skb->data, &llc_snap_mpoa_data, sizeof(struct llc_snap_hdr)) == 0) { /* MPOA data */
686 printk("mpoa: (%s) mpc_push: non-tagged data packet arrived\n", dev->name);
687 printk(" mpc_push: non-tagged data unsupported, purging\n");
688 dev_kfree_skb_any(skb);
689 return;
690 } else {
691 printk("mpoa: (%s) mpc_push: garbage arrived, purging\n", dev->name);
692 dev_kfree_skb_any(skb);
693 return;
694 }
695
696 tmp = skb->data + sizeof(struct llc_snap_hdr);
697 tag = *(__be32 *)tmp;
698
699 eg = mpc->eg_ops->get_by_tag(tag, mpc);
700 if (eg == NULL) {
701 printk("mpoa: (%s) mpc_push: Didn't find egress cache entry, tag = %u\n",
702 dev->name,tag);
703 purge_egress_shortcut(vcc, NULL);
704 dev_kfree_skb_any(skb);
705 return;
706 }
707
708 /*
709 * See if ingress MPC is using shortcut we opened as a return channel.
710 * This means we have a bi-directional vcc opened by us.
711 */
712 if (eg->shortcut == NULL) {
713 eg->shortcut = vcc;
714 printk("mpoa: (%s) mpc_push: egress SVC in use\n", dev->name);
715 }
716
717 skb_pull(skb, sizeof(struct llc_snap_hdr) + sizeof(tag)); /* get rid of LLC/SNAP header */
718 new_skb = skb_realloc_headroom(skb, eg->ctrl_info.DH_length); /* LLC/SNAP is shorter than MAC header :( */
719 dev_kfree_skb_any(skb);
720 if (new_skb == NULL){
721 mpc->eg_ops->put(eg);
722 return;
723 }
724 skb_push(new_skb, eg->ctrl_info.DH_length); /* add MAC header */
725 skb_copy_to_linear_data(new_skb, eg->ctrl_info.DLL_header,
726 eg->ctrl_info.DH_length);
727 new_skb->protocol = eth_type_trans(new_skb, dev);
728 skb_reset_network_header(new_skb);
729
730 eg->latest_ip_addr = ip_hdr(new_skb)->saddr;
731 eg->packets_rcvd++;
732 mpc->eg_ops->put(eg);
733
734 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
735 netif_rx(new_skb);
736
737 return;
738 }
739
740 static struct atmdev_ops mpc_ops = { /* only send is required */
741 .close = mpoad_close,
742 .send = msg_from_mpoad
743 };
744
745 static struct atm_dev mpc_dev = {
746 .ops = &mpc_ops,
747 .type = "mpc",
748 .number = 42,
749 .lock = __SPIN_LOCK_UNLOCKED(mpc_dev.lock)
750 /* members not explicitly initialised will be 0 */
751 };
752
753 static int atm_mpoa_mpoad_attach (struct atm_vcc *vcc, int arg)
754 {
755 struct mpoa_client *mpc;
756 struct lec_priv *priv;
757 int err;
758
759 if (mpcs == NULL) {
760 init_timer(&mpc_timer);
761 mpc_timer_refresh();
762
763 /* This lets us now how our LECs are doing */
764 err = register_netdevice_notifier(&mpoa_notifier);
765 if (err < 0) {
766 del_timer(&mpc_timer);
767 return err;
768 }
769 }
770
771 mpc = find_mpc_by_itfnum(arg);
772 if (mpc == NULL) {
773 dprintk("mpoa: mpoad_attach: allocating new mpc for itf %d\n", arg);
774 mpc = alloc_mpc();
775 if (mpc == NULL)
776 return -ENOMEM;
777 mpc->dev_num = arg;
778 mpc->dev = find_lec_by_itfnum(arg); /* NULL if there was no lec */
779 }
780 if (mpc->mpoad_vcc) {
781 printk("mpoa: mpoad_attach: mpoad is already present for itf %d\n", arg);
782 return -EADDRINUSE;
783 }
784
785 if (mpc->dev) { /* check if the lec is LANE2 capable */
786 priv = netdev_priv(mpc->dev);
787 if (priv->lane_version < 2) {
788 dev_put(mpc->dev);
789 mpc->dev = NULL;
790 } else
791 priv->lane2_ops->associate_indicator = lane2_assoc_ind;
792 }
793
794 mpc->mpoad_vcc = vcc;
795 vcc->dev = &mpc_dev;
796 vcc_insert_socket(sk_atm(vcc));
797 set_bit(ATM_VF_META,&vcc->flags);
798 set_bit(ATM_VF_READY,&vcc->flags);
799
800 if (mpc->dev) {
801 char empty[ATM_ESA_LEN];
802 memset(empty, 0, ATM_ESA_LEN);
803
804 start_mpc(mpc, mpc->dev);
805 /* set address if mpcd e.g. gets killed and restarted.
806 * If we do not do it now we have to wait for the next LE_ARP
807 */
808 if ( memcmp(mpc->mps_ctrl_addr, empty, ATM_ESA_LEN) != 0 )
809 send_set_mps_ctrl_addr(mpc->mps_ctrl_addr, mpc);
810 }
811
812 __module_get(THIS_MODULE);
813 return arg;
814 }
815
816 static void send_set_mps_ctrl_addr(const char *addr, struct mpoa_client *mpc)
817 {
818 struct k_message mesg;
819
820 memcpy (mpc->mps_ctrl_addr, addr, ATM_ESA_LEN);
821
822 mesg.type = SET_MPS_CTRL_ADDR;
823 memcpy(mesg.MPS_ctrl, addr, ATM_ESA_LEN);
824 msg_to_mpoad(&mesg, mpc);
825
826 return;
827 }
828
829 static void mpoad_close(struct atm_vcc *vcc)
830 {
831 struct mpoa_client *mpc;
832 struct sk_buff *skb;
833
834 mpc = find_mpc_by_vcc(vcc);
835 if (mpc == NULL) {
836 printk("mpoa: mpoad_close: did not find MPC\n");
837 return;
838 }
839 if (!mpc->mpoad_vcc) {
840 printk("mpoa: mpoad_close: close for non-present mpoad\n");
841 return;
842 }
843
844 mpc->mpoad_vcc = NULL;
845 if (mpc->dev) {
846 struct lec_priv *priv = netdev_priv(mpc->dev);
847 priv->lane2_ops->associate_indicator = NULL;
848 stop_mpc(mpc);
849 dev_put(mpc->dev);
850 }
851
852 mpc->in_ops->destroy_cache(mpc);
853 mpc->eg_ops->destroy_cache(mpc);
854
855 while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue))) {
856 atm_return(vcc, skb->truesize);
857 kfree_skb(skb);
858 }
859
860 printk("mpoa: (%s) going down\n",
861 (mpc->dev) ? mpc->dev->name : "<unknown>");
862 module_put(THIS_MODULE);
863
864 return;
865 }
866
867 /*
868 *
869 */
870 static int msg_from_mpoad(struct atm_vcc *vcc, struct sk_buff *skb)
871 {
872
873 struct mpoa_client *mpc = find_mpc_by_vcc(vcc);
874 struct k_message *mesg = (struct k_message*)skb->data;
875 atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
876
877 if (mpc == NULL) {
878 printk("mpoa: msg_from_mpoad: no mpc found\n");
879 return 0;
880 }
881 dprintk("mpoa: (%s) msg_from_mpoad:", (mpc->dev) ? mpc->dev->name : "<unknown>");
882 switch(mesg->type) {
883 case MPOA_RES_REPLY_RCVD:
884 dprintk(" mpoa_res_reply_rcvd\n");
885 MPOA_res_reply_rcvd(mesg, mpc);
886 break;
887 case MPOA_TRIGGER_RCVD:
888 dprintk(" mpoa_trigger_rcvd\n");
889 MPOA_trigger_rcvd(mesg, mpc);
890 break;
891 case INGRESS_PURGE_RCVD:
892 dprintk(" nhrp_purge_rcvd\n");
893 ingress_purge_rcvd(mesg, mpc);
894 break;
895 case EGRESS_PURGE_RCVD:
896 dprintk(" egress_purge_reply_rcvd\n");
897 egress_purge_rcvd(mesg, mpc);
898 break;
899 case MPS_DEATH:
900 dprintk(" mps_death\n");
901 mps_death(mesg, mpc);
902 break;
903 case CACHE_IMPOS_RCVD:
904 dprintk(" cache_impos_rcvd\n");
905 MPOA_cache_impos_rcvd(mesg, mpc);
906 break;
907 case SET_MPC_CTRL_ADDR:
908 dprintk(" set_mpc_ctrl_addr\n");
909 set_mpc_ctrl_addr_rcvd(mesg, mpc);
910 break;
911 case SET_MPS_MAC_ADDR:
912 dprintk(" set_mps_mac_addr\n");
913 set_mps_mac_addr_rcvd(mesg, mpc);
914 break;
915 case CLEAN_UP_AND_EXIT:
916 dprintk(" clean_up_and_exit\n");
917 clean_up(mesg, mpc, DIE);
918 break;
919 case RELOAD:
920 dprintk(" reload\n");
921 clean_up(mesg, mpc, RELOAD);
922 break;
923 case SET_MPC_PARAMS:
924 dprintk(" set_mpc_params\n");
925 mpc->parameters = mesg->content.params;
926 break;
927 default:
928 dprintk(" unknown message %d\n", mesg->type);
929 break;
930 }
931 kfree_skb(skb);
932
933 return 0;
934 }
935
936 /* Remember that this function may not do things that sleep */
937 int msg_to_mpoad(struct k_message *mesg, struct mpoa_client *mpc)
938 {
939 struct sk_buff *skb;
940 struct sock *sk;
941
942 if (mpc == NULL || !mpc->mpoad_vcc) {
943 printk("mpoa: msg_to_mpoad: mesg %d to a non-existent mpoad\n", mesg->type);
944 return -ENXIO;
945 }
946
947 skb = alloc_skb(sizeof(struct k_message), GFP_ATOMIC);
948 if (skb == NULL)
949 return -ENOMEM;
950 skb_put(skb, sizeof(struct k_message));
951 skb_copy_to_linear_data(skb, mesg, sizeof(*mesg));
952 atm_force_charge(mpc->mpoad_vcc, skb->truesize);
953
954 sk = sk_atm(mpc->mpoad_vcc);
955 skb_queue_tail(&sk->sk_receive_queue, skb);
956 sk->sk_data_ready(sk, skb->len);
957
958 return 0;
959 }
960
961 static int mpoa_event_listener(struct notifier_block *mpoa_notifier, unsigned long event, void *dev_ptr)
962 {
963 struct net_device *dev;
964 struct mpoa_client *mpc;
965 struct lec_priv *priv;
966
967 dev = (struct net_device *)dev_ptr;
968
969 if (!net_eq(dev_net(dev), &init_net))
970 return NOTIFY_DONE;
971
972 if (dev->name == NULL || strncmp(dev->name, "lec", 3))
973 return NOTIFY_DONE; /* we are only interested in lec:s */
974
975 switch (event) {
976 case NETDEV_REGISTER: /* a new lec device was allocated */
977 priv = netdev_priv(dev);
978 if (priv->lane_version < 2)
979 break;
980 priv->lane2_ops->associate_indicator = lane2_assoc_ind;
981 mpc = find_mpc_by_itfnum(priv->itfnum);
982 if (mpc == NULL) {
983 dprintk("mpoa: mpoa_event_listener: allocating new mpc for %s\n",
984 dev->name);
985 mpc = alloc_mpc();
986 if (mpc == NULL) {
987 printk("mpoa: mpoa_event_listener: no new mpc");
988 break;
989 }
990 }
991 mpc->dev_num = priv->itfnum;
992 mpc->dev = dev;
993 dev_hold(dev);
994 dprintk("mpoa: (%s) was initialized\n", dev->name);
995 break;
996 case NETDEV_UNREGISTER:
997 /* the lec device was deallocated */
998 mpc = find_mpc_by_lec(dev);
999 if (mpc == NULL)
1000 break;
1001 dprintk("mpoa: device (%s) was deallocated\n", dev->name);
1002 stop_mpc(mpc);
1003 dev_put(mpc->dev);
1004 mpc->dev = NULL;
1005 break;
1006 case NETDEV_UP:
1007 /* the dev was ifconfig'ed up */
1008 mpc = find_mpc_by_lec(dev);
1009 if (mpc == NULL)
1010 break;
1011 if (mpc->mpoad_vcc != NULL) {
1012 start_mpc(mpc, dev);
1013 }
1014 break;
1015 case NETDEV_DOWN:
1016 /* the dev was ifconfig'ed down */
1017 /* this means that the flow of packets from the
1018 * upper layer stops
1019 */
1020 mpc = find_mpc_by_lec(dev);
1021 if (mpc == NULL)
1022 break;
1023 if (mpc->mpoad_vcc != NULL) {
1024 stop_mpc(mpc);
1025 }
1026 break;
1027 case NETDEV_REBOOT:
1028 case NETDEV_CHANGE:
1029 case NETDEV_CHANGEMTU:
1030 case NETDEV_CHANGEADDR:
1031 case NETDEV_GOING_DOWN:
1032 break;
1033 default:
1034 break;
1035 }
1036
1037 return NOTIFY_DONE;
1038 }
1039
1040 /*
1041 * Functions which are called after a message is received from mpcd.
1042 * Msg is reused on purpose.
1043 */
1044
1045
1046 static void MPOA_trigger_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1047 {
1048 __be32 dst_ip = msg->content.in_info.in_dst_ip;
1049 in_cache_entry *entry;
1050
1051 entry = mpc->in_ops->get(dst_ip, mpc);
1052 if(entry == NULL){
1053 entry = mpc->in_ops->add_entry(dst_ip, mpc);
1054 entry->entry_state = INGRESS_RESOLVING;
1055 msg->type = SND_MPOA_RES_RQST;
1056 msg->content.in_info = entry->ctrl_info;
1057 msg_to_mpoad(msg, mpc);
1058 do_gettimeofday(&(entry->reply_wait));
1059 mpc->in_ops->put(entry);
1060 return;
1061 }
1062
1063 if(entry->entry_state == INGRESS_INVALID){
1064 entry->entry_state = INGRESS_RESOLVING;
1065 msg->type = SND_MPOA_RES_RQST;
1066 msg->content.in_info = entry->ctrl_info;
1067 msg_to_mpoad(msg, mpc);
1068 do_gettimeofday(&(entry->reply_wait));
1069 mpc->in_ops->put(entry);
1070 return;
1071 }
1072
1073 printk("mpoa: (%s) MPOA_trigger_rcvd: entry already in resolving state\n",
1074 (mpc->dev) ? mpc->dev->name : "<unknown>");
1075 mpc->in_ops->put(entry);
1076 return;
1077 }
1078
1079 /*
1080 * Things get complicated because we have to check if there's an egress
1081 * shortcut with suitable traffic parameters we could use.
1082 */
1083 static void check_qos_and_open_shortcut(struct k_message *msg, struct mpoa_client *client, in_cache_entry *entry)
1084 {
1085 __be32 dst_ip = msg->content.in_info.in_dst_ip;
1086 struct atm_mpoa_qos *qos = atm_mpoa_search_qos(dst_ip);
1087 eg_cache_entry *eg_entry = client->eg_ops->get_by_src_ip(dst_ip, client);
1088
1089 if(eg_entry && eg_entry->shortcut){
1090 if(eg_entry->shortcut->qos.txtp.traffic_class &
1091 msg->qos.txtp.traffic_class &
1092 (qos ? qos->qos.txtp.traffic_class : ATM_UBR | ATM_CBR)){
1093 if(eg_entry->shortcut->qos.txtp.traffic_class == ATM_UBR)
1094 entry->shortcut = eg_entry->shortcut;
1095 else if(eg_entry->shortcut->qos.txtp.max_pcr > 0)
1096 entry->shortcut = eg_entry->shortcut;
1097 }
1098 if(entry->shortcut){
1099 dprintk("mpoa: (%s) using egress SVC to reach %pI4\n",
1100 client->dev->name, &dst_ip);
1101 client->eg_ops->put(eg_entry);
1102 return;
1103 }
1104 }
1105 if (eg_entry != NULL)
1106 client->eg_ops->put(eg_entry);
1107
1108 /* No luck in the egress cache we must open an ingress SVC */
1109 msg->type = OPEN_INGRESS_SVC;
1110 if (qos && (qos->qos.txtp.traffic_class == msg->qos.txtp.traffic_class))
1111 {
1112 msg->qos = qos->qos;
1113 printk("mpoa: (%s) trying to get a CBR shortcut\n",client->dev->name);
1114 }
1115 else memset(&msg->qos,0,sizeof(struct atm_qos));
1116 msg_to_mpoad(msg, client);
1117 return;
1118 }
1119
1120 static void MPOA_res_reply_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1121 {
1122 __be32 dst_ip = msg->content.in_info.in_dst_ip;
1123 in_cache_entry *entry = mpc->in_ops->get(dst_ip, mpc);
1124
1125 dprintk("mpoa: (%s) MPOA_res_reply_rcvd: ip %pI4\n",
1126 mpc->dev->name, &dst_ip);
1127 ddprintk("mpoa: (%s) MPOA_res_reply_rcvd() entry = %p", mpc->dev->name, entry);
1128 if(entry == NULL){
1129 printk("\nmpoa: (%s) ARGH, received res. reply for an entry that doesn't exist.\n", mpc->dev->name);
1130 return;
1131 }
1132 ddprintk(" entry_state = %d ", entry->entry_state);
1133
1134 if (entry->entry_state == INGRESS_RESOLVED) {
1135 printk("\nmpoa: (%s) MPOA_res_reply_rcvd for RESOLVED entry!\n", mpc->dev->name);
1136 mpc->in_ops->put(entry);
1137 return;
1138 }
1139
1140 entry->ctrl_info = msg->content.in_info;
1141 do_gettimeofday(&(entry->tv));
1142 do_gettimeofday(&(entry->reply_wait)); /* Used in refreshing func from now on */
1143 entry->refresh_time = 0;
1144 ddprintk("entry->shortcut = %p\n", entry->shortcut);
1145
1146 if(entry->entry_state == INGRESS_RESOLVING && entry->shortcut != NULL){
1147 entry->entry_state = INGRESS_RESOLVED;
1148 mpc->in_ops->put(entry);
1149 return; /* Shortcut already open... */
1150 }
1151
1152 if (entry->shortcut != NULL) {
1153 printk("mpoa: (%s) MPOA_res_reply_rcvd: entry->shortcut != NULL, impossible!\n",
1154 mpc->dev->name);
1155 mpc->in_ops->put(entry);
1156 return;
1157 }
1158
1159 check_qos_and_open_shortcut(msg, mpc, entry);
1160 entry->entry_state = INGRESS_RESOLVED;
1161 mpc->in_ops->put(entry);
1162
1163 return;
1164
1165 }
1166
1167 static void ingress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1168 {
1169 __be32 dst_ip = msg->content.in_info.in_dst_ip;
1170 __be32 mask = msg->ip_mask;
1171 in_cache_entry *entry = mpc->in_ops->get_with_mask(dst_ip, mpc, mask);
1172
1173 if(entry == NULL){
1174 printk("mpoa: (%s) ingress_purge_rcvd: purge for a non-existing entry, ip = %pI4\n",
1175 mpc->dev->name, &dst_ip);
1176 return;
1177 }
1178
1179 do {
1180 dprintk("mpoa: (%s) ingress_purge_rcvd: removing an ingress entry, ip = %pI4\n",
1181 mpc->dev->name, &dst_ip);
1182 write_lock_bh(&mpc->ingress_lock);
1183 mpc->in_ops->remove_entry(entry, mpc);
1184 write_unlock_bh(&mpc->ingress_lock);
1185 mpc->in_ops->put(entry);
1186 entry = mpc->in_ops->get_with_mask(dst_ip, mpc, mask);
1187 } while (entry != NULL);
1188
1189 return;
1190 }
1191
1192 static void egress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1193 {
1194 __be32 cache_id = msg->content.eg_info.cache_id;
1195 eg_cache_entry *entry = mpc->eg_ops->get_by_cache_id(cache_id, mpc);
1196
1197 if (entry == NULL) {
1198 dprintk("mpoa: (%s) egress_purge_rcvd: purge for a non-existing entry\n", mpc->dev->name);
1199 return;
1200 }
1201
1202 write_lock_irq(&mpc->egress_lock);
1203 mpc->eg_ops->remove_entry(entry, mpc);
1204 write_unlock_irq(&mpc->egress_lock);
1205
1206 mpc->eg_ops->put(entry);
1207
1208 return;
1209 }
1210
1211 static void purge_egress_shortcut(struct atm_vcc *vcc, eg_cache_entry *entry)
1212 {
1213 struct sock *sk;
1214 struct k_message *purge_msg;
1215 struct sk_buff *skb;
1216
1217 dprintk("mpoa: purge_egress_shortcut: entering\n");
1218 if (vcc == NULL) {
1219 printk("mpoa: purge_egress_shortcut: vcc == NULL\n");
1220 return;
1221 }
1222
1223 skb = alloc_skb(sizeof(struct k_message), GFP_ATOMIC);
1224 if (skb == NULL) {
1225 printk("mpoa: purge_egress_shortcut: out of memory\n");
1226 return;
1227 }
1228
1229 skb_put(skb, sizeof(struct k_message));
1230 memset(skb->data, 0, sizeof(struct k_message));
1231 purge_msg = (struct k_message *)skb->data;
1232 purge_msg->type = DATA_PLANE_PURGE;
1233 if (entry != NULL)
1234 purge_msg->content.eg_info = entry->ctrl_info;
1235
1236 atm_force_charge(vcc, skb->truesize);
1237
1238 sk = sk_atm(vcc);
1239 skb_queue_tail(&sk->sk_receive_queue, skb);
1240 sk->sk_data_ready(sk, skb->len);
1241 dprintk("mpoa: purge_egress_shortcut: exiting:\n");
1242
1243 return;
1244 }
1245
1246 /*
1247 * Our MPS died. Tell our daemon to send NHRP data plane purge to each
1248 * of the egress shortcuts we have.
1249 */
1250 static void mps_death( struct k_message * msg, struct mpoa_client * mpc )
1251 {
1252 eg_cache_entry *entry;
1253
1254 dprintk("mpoa: (%s) mps_death:\n", mpc->dev->name);
1255
1256 if(memcmp(msg->MPS_ctrl, mpc->mps_ctrl_addr, ATM_ESA_LEN)){
1257 printk("mpoa: (%s) mps_death: wrong MPS\n", mpc->dev->name);
1258 return;
1259 }
1260
1261 /* FIXME: This knows too much of the cache structure */
1262 read_lock_irq(&mpc->egress_lock);
1263 entry = mpc->eg_cache;
1264 while (entry != NULL) {
1265 purge_egress_shortcut(entry->shortcut, entry);
1266 entry = entry->next;
1267 }
1268 read_unlock_irq(&mpc->egress_lock);
1269
1270 mpc->in_ops->destroy_cache(mpc);
1271 mpc->eg_ops->destroy_cache(mpc);
1272
1273 return;
1274 }
1275
1276 static void MPOA_cache_impos_rcvd( struct k_message * msg, struct mpoa_client * mpc)
1277 {
1278 uint16_t holding_time;
1279 eg_cache_entry *entry = mpc->eg_ops->get_by_cache_id(msg->content.eg_info.cache_id, mpc);
1280
1281 holding_time = msg->content.eg_info.holding_time;
1282 dprintk("mpoa: (%s) MPOA_cache_impos_rcvd: entry = %p, holding_time = %u\n",
1283 mpc->dev->name, entry, holding_time);
1284 if(entry == NULL && holding_time) {
1285 entry = mpc->eg_ops->add_entry(msg, mpc);
1286 mpc->eg_ops->put(entry);
1287 return;
1288 }
1289 if(holding_time){
1290 mpc->eg_ops->update(entry, holding_time);
1291 return;
1292 }
1293
1294 write_lock_irq(&mpc->egress_lock);
1295 mpc->eg_ops->remove_entry(entry, mpc);
1296 write_unlock_irq(&mpc->egress_lock);
1297
1298 mpc->eg_ops->put(entry);
1299
1300 return;
1301 }
1302
1303 static void set_mpc_ctrl_addr_rcvd(struct k_message *mesg, struct mpoa_client *mpc)
1304 {
1305 struct lec_priv *priv;
1306 int i, retval ;
1307
1308 uint8_t tlv[4 + 1 + 1 + 1 + ATM_ESA_LEN];
1309
1310 tlv[0] = 00; tlv[1] = 0xa0; tlv[2] = 0x3e; tlv[3] = 0x2a; /* type */
1311 tlv[4] = 1 + 1 + ATM_ESA_LEN; /* length */
1312 tlv[5] = 0x02; /* MPOA client */
1313 tlv[6] = 0x00; /* number of MPS MAC addresses */
1314
1315 memcpy(&tlv[7], mesg->MPS_ctrl, ATM_ESA_LEN); /* MPC ctrl ATM addr */
1316 memcpy(mpc->our_ctrl_addr, mesg->MPS_ctrl, ATM_ESA_LEN);
1317
1318 dprintk("mpoa: (%s) setting MPC ctrl ATM address to ",
1319 (mpc->dev) ? mpc->dev->name : "<unknown>");
1320 for (i = 7; i < sizeof(tlv); i++)
1321 dprintk("%02x ", tlv[i]);
1322 dprintk("\n");
1323
1324 if (mpc->dev) {
1325 priv = netdev_priv(mpc->dev);
1326 retval = priv->lane2_ops->associate_req(mpc->dev, mpc->dev->dev_addr, tlv, sizeof(tlv));
1327 if (retval == 0)
1328 printk("mpoa: (%s) MPOA device type TLV association failed\n", mpc->dev->name);
1329 retval = priv->lane2_ops->resolve(mpc->dev, NULL, 1, NULL, NULL);
1330 if (retval < 0)
1331 printk("mpoa: (%s) targetless LE_ARP request failed\n", mpc->dev->name);
1332 }
1333
1334 return;
1335 }
1336
1337 static void set_mps_mac_addr_rcvd(struct k_message *msg, struct mpoa_client *client)
1338 {
1339
1340 if(client->number_of_mps_macs)
1341 kfree(client->mps_macs);
1342 client->number_of_mps_macs = 0;
1343 client->mps_macs = kmemdup(msg->MPS_ctrl, ETH_ALEN, GFP_KERNEL);
1344 if (client->mps_macs == NULL) {
1345 printk("mpoa: set_mps_mac_addr_rcvd: out of memory\n");
1346 return;
1347 }
1348 client->number_of_mps_macs = 1;
1349
1350 return;
1351 }
1352
1353 /*
1354 * purge egress cache and tell daemon to 'action' (DIE, RELOAD)
1355 */
1356 static void clean_up(struct k_message *msg, struct mpoa_client *mpc, int action)
1357 {
1358
1359 eg_cache_entry *entry;
1360 msg->type = SND_EGRESS_PURGE;
1361
1362
1363 /* FIXME: This knows too much of the cache structure */
1364 read_lock_irq(&mpc->egress_lock);
1365 entry = mpc->eg_cache;
1366 while (entry != NULL){
1367 msg->content.eg_info = entry->ctrl_info;
1368 dprintk("mpoa: cache_id %u\n", entry->ctrl_info.cache_id);
1369 msg_to_mpoad(msg, mpc);
1370 entry = entry->next;
1371 }
1372 read_unlock_irq(&mpc->egress_lock);
1373
1374 msg->type = action;
1375 msg_to_mpoad(msg, mpc);
1376 return;
1377 }
1378
1379 static void mpc_timer_refresh(void)
1380 {
1381 mpc_timer.expires = jiffies + (MPC_P2 * HZ);
1382 mpc_timer.data = mpc_timer.expires;
1383 mpc_timer.function = mpc_cache_check;
1384 add_timer(&mpc_timer);
1385
1386 return;
1387 }
1388
1389 static void mpc_cache_check( unsigned long checking_time )
1390 {
1391 struct mpoa_client *mpc = mpcs;
1392 static unsigned long previous_resolving_check_time;
1393 static unsigned long previous_refresh_time;
1394
1395 while( mpc != NULL ){
1396 mpc->in_ops->clear_count(mpc);
1397 mpc->eg_ops->clear_expired(mpc);
1398 if(checking_time - previous_resolving_check_time > mpc->parameters.mpc_p4 * HZ ){
1399 mpc->in_ops->check_resolving(mpc);
1400 previous_resolving_check_time = checking_time;
1401 }
1402 if(checking_time - previous_refresh_time > mpc->parameters.mpc_p5 * HZ ){
1403 mpc->in_ops->refresh(mpc);
1404 previous_refresh_time = checking_time;
1405 }
1406 mpc = mpc->next;
1407 }
1408 mpc_timer_refresh();
1409
1410 return;
1411 }
1412
1413 static int atm_mpoa_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1414 {
1415 int err = 0;
1416 struct atm_vcc *vcc = ATM_SD(sock);
1417
1418 if (cmd != ATMMPC_CTRL && cmd != ATMMPC_DATA)
1419 return -ENOIOCTLCMD;
1420
1421 if (!capable(CAP_NET_ADMIN))
1422 return -EPERM;
1423
1424 switch (cmd) {
1425 case ATMMPC_CTRL:
1426 err = atm_mpoa_mpoad_attach(vcc, (int)arg);
1427 if (err >= 0)
1428 sock->state = SS_CONNECTED;
1429 break;
1430 case ATMMPC_DATA:
1431 err = atm_mpoa_vcc_attach(vcc, (void __user *)arg);
1432 break;
1433 default:
1434 break;
1435 }
1436 return err;
1437 }
1438
1439
1440 static struct atm_ioctl atm_ioctl_ops = {
1441 .owner = THIS_MODULE,
1442 .ioctl = atm_mpoa_ioctl,
1443 };
1444
1445 static __init int atm_mpoa_init(void)
1446 {
1447 register_atm_ioctl(&atm_ioctl_ops);
1448
1449 if (mpc_proc_init() != 0)
1450 printk(KERN_INFO "mpoa: failed to initialize /proc/mpoa\n");
1451
1452 printk("mpc.c: " __DATE__ " " __TIME__ " initialized\n");
1453
1454 return 0;
1455 }
1456
1457 static void __exit atm_mpoa_cleanup(void)
1458 {
1459 struct mpoa_client *mpc, *tmp;
1460 struct atm_mpoa_qos *qos, *nextqos;
1461 struct lec_priv *priv;
1462
1463 mpc_proc_clean();
1464
1465 del_timer(&mpc_timer);
1466 unregister_netdevice_notifier(&mpoa_notifier);
1467 deregister_atm_ioctl(&atm_ioctl_ops);
1468
1469 mpc = mpcs;
1470 mpcs = NULL;
1471 while (mpc != NULL) {
1472 tmp = mpc->next;
1473 if (mpc->dev != NULL) {
1474 stop_mpc(mpc);
1475 priv = netdev_priv(mpc->dev);
1476 if (priv->lane2_ops != NULL)
1477 priv->lane2_ops->associate_indicator = NULL;
1478 }
1479 ddprintk("mpoa: cleanup_module: about to clear caches\n");
1480 mpc->in_ops->destroy_cache(mpc);
1481 mpc->eg_ops->destroy_cache(mpc);
1482 ddprintk("mpoa: cleanup_module: caches cleared\n");
1483 kfree(mpc->mps_macs);
1484 memset(mpc, 0, sizeof(struct mpoa_client));
1485 ddprintk("mpoa: cleanup_module: about to kfree %p\n", mpc);
1486 kfree(mpc);
1487 ddprintk("mpoa: cleanup_module: next mpc is at %p\n", tmp);
1488 mpc = tmp;
1489 }
1490
1491 qos = qos_head;
1492 qos_head = NULL;
1493 while (qos != NULL) {
1494 nextqos = qos->next;
1495 dprintk("mpoa: cleanup_module: freeing qos entry %p\n", qos);
1496 kfree(qos);
1497 qos = nextqos;
1498 }
1499
1500 return;
1501 }
1502
1503 module_init(atm_mpoa_init);
1504 module_exit(atm_mpoa_cleanup);
1505
1506 MODULE_LICENSE("GPL");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree