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[linux-rt-nao.git] / net / sched / sch_atm.c
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1 /* net/sched/sch_atm.c - ATM VC selection "queueing discipline" */
2
3 /* Written 1998-2000 by Werner Almesberger, EPFL ICA */
4
5 #include <linux/module.h>
6 #include <linux/init.h>
7 #include <linux/string.h>
8 #include <linux/errno.h>
9 #include <linux/skbuff.h>
10 #include <linux/atmdev.h>
11 #include <linux/atmclip.h>
12 #include <linux/rtnetlink.h>
13 #include <linux/file.h> /* for fput */
14 #include <net/netlink.h>
15 #include <net/pkt_sched.h>
16
17 extern struct socket *sockfd_lookup(int fd, int *err); /* @@@ fix this */
18
19 /*
20 * The ATM queuing discipline provides a framework for invoking classifiers
21 * (aka "filters"), which in turn select classes of this queuing discipline.
22 * Each class maps the flow(s) it is handling to a given VC. Multiple classes
23 * may share the same VC.
24 *
25 * When creating a class, VCs are specified by passing the number of the open
26 * socket descriptor by which the calling process references the VC. The kernel
27 * keeps the VC open at least until all classes using it are removed.
28 *
29 * In this file, most functions are named atm_tc_* to avoid confusion with all
30 * the atm_* in net/atm. This naming convention differs from what's used in the
31 * rest of net/sched.
32 *
33 * Known bugs:
34 * - sometimes messes up the IP stack
35 * - any manipulations besides the few operations described in the README, are
36 * untested and likely to crash the system
37 * - should lock the flow while there is data in the queue (?)
38 */
39
40 #define VCC2FLOW(vcc) ((struct atm_flow_data *) ((vcc)->user_back))
41
42 struct atm_flow_data {
43 struct Qdisc *q; /* FIFO, TBF, etc. */
44 struct tcf_proto *filter_list;
45 struct atm_vcc *vcc; /* VCC; NULL if VCC is closed */
46 void (*old_pop)(struct atm_vcc *vcc,
47 struct sk_buff *skb); /* chaining */
48 struct atm_qdisc_data *parent; /* parent qdisc */
49 struct socket *sock; /* for closing */
50 u32 classid; /* x:y type ID */
51 int ref; /* reference count */
52 struct gnet_stats_basic bstats;
53 struct gnet_stats_queue qstats;
54 struct atm_flow_data *next;
55 struct atm_flow_data *excess; /* flow for excess traffic;
56 NULL to set CLP instead */
57 int hdr_len;
58 unsigned char hdr[0]; /* header data; MUST BE LAST */
59 };
60
61 struct atm_qdisc_data {
62 struct atm_flow_data link; /* unclassified skbs go here */
63 struct atm_flow_data *flows; /* NB: "link" is also on this
64 list */
65 struct tasklet_struct task; /* dequeue tasklet */
66 };
67
68 /* ------------------------- Class/flow operations ------------------------- */
69
70 static int find_flow(struct atm_qdisc_data *qdisc, struct atm_flow_data *flow)
71 {
72 struct atm_flow_data *walk;
73
74 pr_debug("find_flow(qdisc %p,flow %p)\n", qdisc, flow);
75 for (walk = qdisc->flows; walk; walk = walk->next)
76 if (walk == flow)
77 return 1;
78 pr_debug("find_flow: not found\n");
79 return 0;
80 }
81
82 static inline struct atm_flow_data *lookup_flow(struct Qdisc *sch, u32 classid)
83 {
84 struct atm_qdisc_data *p = qdisc_priv(sch);
85 struct atm_flow_data *flow;
86
87 for (flow = p->flows; flow; flow = flow->next)
88 if (flow->classid == classid)
89 break;
90 return flow;
91 }
92
93 static int atm_tc_graft(struct Qdisc *sch, unsigned long arg,
94 struct Qdisc *new, struct Qdisc **old)
95 {
96 struct atm_qdisc_data *p = qdisc_priv(sch);
97 struct atm_flow_data *flow = (struct atm_flow_data *)arg;
98
99 pr_debug("atm_tc_graft(sch %p,[qdisc %p],flow %p,new %p,old %p)\n",
100 sch, p, flow, new, old);
101 if (!find_flow(p, flow))
102 return -EINVAL;
103 if (!new)
104 new = &noop_qdisc;
105 *old = flow->q;
106 flow->q = new;
107 if (*old)
108 qdisc_reset(*old);
109 return 0;
110 }
111
112 static struct Qdisc *atm_tc_leaf(struct Qdisc *sch, unsigned long cl)
113 {
114 struct atm_flow_data *flow = (struct atm_flow_data *)cl;
115
116 pr_debug("atm_tc_leaf(sch %p,flow %p)\n", sch, flow);
117 return flow ? flow->q : NULL;
118 }
119
120 static unsigned long atm_tc_get(struct Qdisc *sch, u32 classid)
121 {
122 struct atm_qdisc_data *p __maybe_unused = qdisc_priv(sch);
123 struct atm_flow_data *flow;
124
125 pr_debug("atm_tc_get(sch %p,[qdisc %p],classid %x)\n", sch, p, classid);
126 flow = lookup_flow(sch, classid);
127 if (flow)
128 flow->ref++;
129 pr_debug("atm_tc_get: flow %p\n", flow);
130 return (unsigned long)flow;
131 }
132
133 static unsigned long atm_tc_bind_filter(struct Qdisc *sch,
134 unsigned long parent, u32 classid)
135 {
136 return atm_tc_get(sch, classid);
137 }
138
139 /*
140 * atm_tc_put handles all destructions, including the ones that are explicitly
141 * requested (atm_tc_destroy, etc.). The assumption here is that we never drop
142 * anything that still seems to be in use.
143 */
144 static void atm_tc_put(struct Qdisc *sch, unsigned long cl)
145 {
146 struct atm_qdisc_data *p = qdisc_priv(sch);
147 struct atm_flow_data *flow = (struct atm_flow_data *)cl;
148 struct atm_flow_data **prev;
149
150 pr_debug("atm_tc_put(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
151 if (--flow->ref)
152 return;
153 pr_debug("atm_tc_put: destroying\n");
154 for (prev = &p->flows; *prev; prev = &(*prev)->next)
155 if (*prev == flow)
156 break;
157 if (!*prev) {
158 printk(KERN_CRIT "atm_tc_put: class %p not found\n", flow);
159 return;
160 }
161 *prev = flow->next;
162 pr_debug("atm_tc_put: qdisc %p\n", flow->q);
163 qdisc_destroy(flow->q);
164 tcf_destroy_chain(&flow->filter_list);
165 if (flow->sock) {
166 pr_debug("atm_tc_put: f_count %ld\n",
167 file_count(flow->sock->file));
168 flow->vcc->pop = flow->old_pop;
169 sockfd_put(flow->sock);
170 }
171 if (flow->excess)
172 atm_tc_put(sch, (unsigned long)flow->excess);
173 if (flow != &p->link)
174 kfree(flow);
175 /*
176 * If flow == &p->link, the qdisc no longer works at this point and
177 * needs to be removed. (By the caller of atm_tc_put.)
178 */
179 }
180
181 static void sch_atm_pop(struct atm_vcc *vcc, struct sk_buff *skb)
182 {
183 struct atm_qdisc_data *p = VCC2FLOW(vcc)->parent;
184
185 pr_debug("sch_atm_pop(vcc %p,skb %p,[qdisc %p])\n", vcc, skb, p);
186 VCC2FLOW(vcc)->old_pop(vcc, skb);
187 tasklet_schedule(&p->task);
188 }
189
190 static const u8 llc_oui_ip[] = {
191 0xaa, /* DSAP: non-ISO */
192 0xaa, /* SSAP: non-ISO */
193 0x03, /* Ctrl: Unnumbered Information Command PDU */
194 0x00, /* OUI: EtherType */
195 0x00, 0x00,
196 0x08, 0x00
197 }; /* Ethertype IP (0800) */
198
199 static const struct nla_policy atm_policy[TCA_ATM_MAX + 1] = {
200 [TCA_ATM_FD] = { .type = NLA_U32 },
201 [TCA_ATM_EXCESS] = { .type = NLA_U32 },
202 };
203
204 static int atm_tc_change(struct Qdisc *sch, u32 classid, u32 parent,
205 struct nlattr **tca, unsigned long *arg)
206 {
207 struct atm_qdisc_data *p = qdisc_priv(sch);
208 struct atm_flow_data *flow = (struct atm_flow_data *)*arg;
209 struct atm_flow_data *excess = NULL;
210 struct nlattr *opt = tca[TCA_OPTIONS];
211 struct nlattr *tb[TCA_ATM_MAX + 1];
212 struct socket *sock;
213 int fd, error, hdr_len;
214 void *hdr;
215
216 pr_debug("atm_tc_change(sch %p,[qdisc %p],classid %x,parent %x,"
217 "flow %p,opt %p)\n", sch, p, classid, parent, flow, opt);
218 /*
219 * The concept of parents doesn't apply for this qdisc.
220 */
221 if (parent && parent != TC_H_ROOT && parent != sch->handle)
222 return -EINVAL;
223 /*
224 * ATM classes cannot be changed. In order to change properties of the
225 * ATM connection, that socket needs to be modified directly (via the
226 * native ATM API. In order to send a flow to a different VC, the old
227 * class needs to be removed and a new one added. (This may be changed
228 * later.)
229 */
230 if (flow)
231 return -EBUSY;
232 if (opt == NULL)
233 return -EINVAL;
234
235 error = nla_parse_nested(tb, TCA_ATM_MAX, opt, atm_policy);
236 if (error < 0)
237 return error;
238
239 if (!tb[TCA_ATM_FD])
240 return -EINVAL;
241 fd = nla_get_u32(tb[TCA_ATM_FD]);
242 pr_debug("atm_tc_change: fd %d\n", fd);
243 if (tb[TCA_ATM_HDR]) {
244 hdr_len = nla_len(tb[TCA_ATM_HDR]);
245 hdr = nla_data(tb[TCA_ATM_HDR]);
246 } else {
247 hdr_len = RFC1483LLC_LEN;
248 hdr = NULL; /* default LLC/SNAP for IP */
249 }
250 if (!tb[TCA_ATM_EXCESS])
251 excess = NULL;
252 else {
253 excess = (struct atm_flow_data *)
254 atm_tc_get(sch, nla_get_u32(tb[TCA_ATM_EXCESS]));
255 if (!excess)
256 return -ENOENT;
257 }
258 pr_debug("atm_tc_change: type %d, payload %d, hdr_len %d\n",
259 opt->nla_type, nla_len(opt), hdr_len);
260 sock = sockfd_lookup(fd, &error);
261 if (!sock)
262 return error; /* f_count++ */
263 pr_debug("atm_tc_change: f_count %ld\n", file_count(sock->file));
264 if (sock->ops->family != PF_ATMSVC && sock->ops->family != PF_ATMPVC) {
265 error = -EPROTOTYPE;
266 goto err_out;
267 }
268 /* @@@ should check if the socket is really operational or we'll crash
269 on vcc->send */
270 if (classid) {
271 if (TC_H_MAJ(classid ^ sch->handle)) {
272 pr_debug("atm_tc_change: classid mismatch\n");
273 error = -EINVAL;
274 goto err_out;
275 }
276 if (find_flow(p, flow)) {
277 error = -EEXIST;
278 goto err_out;
279 }
280 } else {
281 int i;
282 unsigned long cl;
283
284 for (i = 1; i < 0x8000; i++) {
285 classid = TC_H_MAKE(sch->handle, 0x8000 | i);
286 cl = atm_tc_get(sch, classid);
287 if (!cl)
288 break;
289 atm_tc_put(sch, cl);
290 }
291 }
292 pr_debug("atm_tc_change: new id %x\n", classid);
293 flow = kzalloc(sizeof(struct atm_flow_data) + hdr_len, GFP_KERNEL);
294 pr_debug("atm_tc_change: flow %p\n", flow);
295 if (!flow) {
296 error = -ENOBUFS;
297 goto err_out;
298 }
299 flow->filter_list = NULL;
300 flow->q = qdisc_create_dflt(qdisc_dev(sch), sch->dev_queue,
301 &pfifo_qdisc_ops, classid);
302 if (!flow->q)
303 flow->q = &noop_qdisc;
304 pr_debug("atm_tc_change: qdisc %p\n", flow->q);
305 flow->sock = sock;
306 flow->vcc = ATM_SD(sock); /* speedup */
307 flow->vcc->user_back = flow;
308 pr_debug("atm_tc_change: vcc %p\n", flow->vcc);
309 flow->old_pop = flow->vcc->pop;
310 flow->parent = p;
311 flow->vcc->pop = sch_atm_pop;
312 flow->classid = classid;
313 flow->ref = 1;
314 flow->excess = excess;
315 flow->next = p->link.next;
316 p->link.next = flow;
317 flow->hdr_len = hdr_len;
318 if (hdr)
319 memcpy(flow->hdr, hdr, hdr_len);
320 else
321 memcpy(flow->hdr, llc_oui_ip, sizeof(llc_oui_ip));
322 *arg = (unsigned long)flow;
323 return 0;
324 err_out:
325 if (excess)
326 atm_tc_put(sch, (unsigned long)excess);
327 sockfd_put(sock);
328 return error;
329 }
330
331 static int atm_tc_delete(struct Qdisc *sch, unsigned long arg)
332 {
333 struct atm_qdisc_data *p = qdisc_priv(sch);
334 struct atm_flow_data *flow = (struct atm_flow_data *)arg;
335
336 pr_debug("atm_tc_delete(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
337 if (!find_flow(qdisc_priv(sch), flow))
338 return -EINVAL;
339 if (flow->filter_list || flow == &p->link)
340 return -EBUSY;
341 /*
342 * Reference count must be 2: one for "keepalive" (set at class
343 * creation), and one for the reference held when calling delete.
344 */
345 if (flow->ref < 2) {
346 printk(KERN_ERR "atm_tc_delete: flow->ref == %d\n", flow->ref);
347 return -EINVAL;
348 }
349 if (flow->ref > 2)
350 return -EBUSY; /* catch references via excess, etc. */
351 atm_tc_put(sch, arg);
352 return 0;
353 }
354
355 static void atm_tc_walk(struct Qdisc *sch, struct qdisc_walker *walker)
356 {
357 struct atm_qdisc_data *p = qdisc_priv(sch);
358 struct atm_flow_data *flow;
359
360 pr_debug("atm_tc_walk(sch %p,[qdisc %p],walker %p)\n", sch, p, walker);
361 if (walker->stop)
362 return;
363 for (flow = p->flows; flow; flow = flow->next) {
364 if (walker->count >= walker->skip)
365 if (walker->fn(sch, (unsigned long)flow, walker) < 0) {
366 walker->stop = 1;
367 break;
368 }
369 walker->count++;
370 }
371 }
372
373 static struct tcf_proto **atm_tc_find_tcf(struct Qdisc *sch, unsigned long cl)
374 {
375 struct atm_qdisc_data *p = qdisc_priv(sch);
376 struct atm_flow_data *flow = (struct atm_flow_data *)cl;
377
378 pr_debug("atm_tc_find_tcf(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
379 return flow ? &flow->filter_list : &p->link.filter_list;
380 }
381
382 /* --------------------------- Qdisc operations ---------------------------- */
383
384 static int atm_tc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
385 {
386 struct atm_qdisc_data *p = qdisc_priv(sch);
387 struct atm_flow_data *flow = NULL; /* @@@ */
388 struct tcf_result res;
389 int result;
390 int ret = NET_XMIT_POLICED;
391
392 pr_debug("atm_tc_enqueue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p);
393 result = TC_POLICE_OK; /* be nice to gcc */
394 if (TC_H_MAJ(skb->priority) != sch->handle ||
395 !(flow = (struct atm_flow_data *)atm_tc_get(sch, skb->priority)))
396 for (flow = p->flows; flow; flow = flow->next)
397 if (flow->filter_list) {
398 result = tc_classify_compat(skb,
399 flow->filter_list,
400 &res);
401 if (result < 0)
402 continue;
403 flow = (struct atm_flow_data *)res.class;
404 if (!flow)
405 flow = lookup_flow(sch, res.classid);
406 break;
407 }
408 if (!flow)
409 flow = &p->link;
410 else {
411 if (flow->vcc)
412 ATM_SKB(skb)->atm_options = flow->vcc->atm_options;
413 /*@@@ looks good ... but it's not supposed to work :-) */
414 #ifdef CONFIG_NET_CLS_ACT
415 switch (result) {
416 case TC_ACT_QUEUED:
417 case TC_ACT_STOLEN:
418 kfree_skb(skb);
419 return NET_XMIT_SUCCESS | __NET_XMIT_STOLEN;
420 case TC_ACT_SHOT:
421 kfree_skb(skb);
422 goto drop;
423 case TC_POLICE_RECLASSIFY:
424 if (flow->excess)
425 flow = flow->excess;
426 else
427 ATM_SKB(skb)->atm_options |= ATM_ATMOPT_CLP;
428 break;
429 }
430 #endif
431 }
432
433 ret = qdisc_enqueue(skb, flow->q);
434 if (ret != 0) {
435 drop: __maybe_unused
436 if (net_xmit_drop_count(ret)) {
437 sch->qstats.drops++;
438 if (flow)
439 flow->qstats.drops++;
440 }
441 return ret;
442 }
443 sch->bstats.bytes += qdisc_pkt_len(skb);
444 sch->bstats.packets++;
445 flow->bstats.bytes += qdisc_pkt_len(skb);
446 flow->bstats.packets++;
447 /*
448 * Okay, this may seem weird. We pretend we've dropped the packet if
449 * it goes via ATM. The reason for this is that the outer qdisc
450 * expects to be able to q->dequeue the packet later on if we return
451 * success at this place. Also, sch->q.qdisc needs to reflect whether
452 * there is a packet egligible for dequeuing or not. Note that the
453 * statistics of the outer qdisc are necessarily wrong because of all
454 * this. There's currently no correct solution for this.
455 */
456 if (flow == &p->link) {
457 sch->q.qlen++;
458 return 0;
459 }
460 tasklet_schedule(&p->task);
461 return NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
462 }
463
464 /*
465 * Dequeue packets and send them over ATM. Note that we quite deliberately
466 * avoid checking net_device's flow control here, simply because sch_atm
467 * uses its own channels, which have nothing to do with any CLIP/LANE/or
468 * non-ATM interfaces.
469 */
470
471 static void sch_atm_dequeue(unsigned long data)
472 {
473 struct Qdisc *sch = (struct Qdisc *)data;
474 struct atm_qdisc_data *p = qdisc_priv(sch);
475 struct atm_flow_data *flow;
476 struct sk_buff *skb;
477
478 pr_debug("sch_atm_dequeue(sch %p,[qdisc %p])\n", sch, p);
479 for (flow = p->link.next; flow; flow = flow->next)
480 /*
481 * If traffic is properly shaped, this won't generate nasty
482 * little bursts. Otherwise, it may ... (but that's okay)
483 */
484 while ((skb = flow->q->ops->peek(flow->q))) {
485 if (!atm_may_send(flow->vcc, skb->truesize))
486 break;
487
488 skb = qdisc_dequeue_peeked(flow->q);
489 if (unlikely(!skb))
490 break;
491
492 pr_debug("atm_tc_dequeue: sending on class %p\n", flow);
493 /* remove any LL header somebody else has attached */
494 skb_pull(skb, skb_network_offset(skb));
495 if (skb_headroom(skb) < flow->hdr_len) {
496 struct sk_buff *new;
497
498 new = skb_realloc_headroom(skb, flow->hdr_len);
499 dev_kfree_skb(skb);
500 if (!new)
501 continue;
502 skb = new;
503 }
504 pr_debug("sch_atm_dequeue: ip %p, data %p\n",
505 skb_network_header(skb), skb->data);
506 ATM_SKB(skb)->vcc = flow->vcc;
507 memcpy(skb_push(skb, flow->hdr_len), flow->hdr,
508 flow->hdr_len);
509 atomic_add(skb->truesize,
510 &sk_atm(flow->vcc)->sk_wmem_alloc);
511 /* atm.atm_options are already set by atm_tc_enqueue */
512 flow->vcc->send(flow->vcc, skb);
513 }
514 }
515
516 static struct sk_buff *atm_tc_dequeue(struct Qdisc *sch)
517 {
518 struct atm_qdisc_data *p = qdisc_priv(sch);
519 struct sk_buff *skb;
520
521 pr_debug("atm_tc_dequeue(sch %p,[qdisc %p])\n", sch, p);
522 tasklet_schedule(&p->task);
523 skb = qdisc_dequeue_peeked(p->link.q);
524 if (skb)
525 sch->q.qlen--;
526 return skb;
527 }
528
529 static struct sk_buff *atm_tc_peek(struct Qdisc *sch)
530 {
531 struct atm_qdisc_data *p = qdisc_priv(sch);
532
533 pr_debug("atm_tc_peek(sch %p,[qdisc %p])\n", sch, p);
534
535 return p->link.q->ops->peek(p->link.q);
536 }
537
538 static unsigned int atm_tc_drop(struct Qdisc *sch)
539 {
540 struct atm_qdisc_data *p = qdisc_priv(sch);
541 struct atm_flow_data *flow;
542 unsigned int len;
543
544 pr_debug("atm_tc_drop(sch %p,[qdisc %p])\n", sch, p);
545 for (flow = p->flows; flow; flow = flow->next)
546 if (flow->q->ops->drop && (len = flow->q->ops->drop(flow->q)))
547 return len;
548 return 0;
549 }
550
551 static int atm_tc_init(struct Qdisc *sch, struct nlattr *opt)
552 {
553 struct atm_qdisc_data *p = qdisc_priv(sch);
554
555 pr_debug("atm_tc_init(sch %p,[qdisc %p],opt %p)\n", sch, p, opt);
556 p->flows = &p->link;
557 p->link.q = qdisc_create_dflt(qdisc_dev(sch), sch->dev_queue,
558 &pfifo_qdisc_ops, sch->handle);
559 if (!p->link.q)
560 p->link.q = &noop_qdisc;
561 pr_debug("atm_tc_init: link (%p) qdisc %p\n", &p->link, p->link.q);
562 p->link.filter_list = NULL;
563 p->link.vcc = NULL;
564 p->link.sock = NULL;
565 p->link.classid = sch->handle;
566 p->link.ref = 1;
567 p->link.next = NULL;
568 tasklet_init(&p->task, sch_atm_dequeue, (unsigned long)sch);
569 return 0;
570 }
571
572 static void atm_tc_reset(struct Qdisc *sch)
573 {
574 struct atm_qdisc_data *p = qdisc_priv(sch);
575 struct atm_flow_data *flow;
576
577 pr_debug("atm_tc_reset(sch %p,[qdisc %p])\n", sch, p);
578 for (flow = p->flows; flow; flow = flow->next)
579 qdisc_reset(flow->q);
580 sch->q.qlen = 0;
581 }
582
583 static void atm_tc_destroy(struct Qdisc *sch)
584 {
585 struct atm_qdisc_data *p = qdisc_priv(sch);
586 struct atm_flow_data *flow;
587
588 pr_debug("atm_tc_destroy(sch %p,[qdisc %p])\n", sch, p);
589 for (flow = p->flows; flow; flow = flow->next)
590 tcf_destroy_chain(&flow->filter_list);
591
592 /* races ? */
593 while ((flow = p->flows)) {
594 if (flow->ref > 1)
595 printk(KERN_ERR "atm_destroy: %p->ref = %d\n", flow,
596 flow->ref);
597 atm_tc_put(sch, (unsigned long)flow);
598 if (p->flows == flow) {
599 printk(KERN_ERR "atm_destroy: putting flow %p didn't "
600 "kill it\n", flow);
601 p->flows = flow->next; /* brute force */
602 break;
603 }
604 }
605 tasklet_kill(&p->task);
606 }
607
608 static int atm_tc_dump_class(struct Qdisc *sch, unsigned long cl,
609 struct sk_buff *skb, struct tcmsg *tcm)
610 {
611 struct atm_qdisc_data *p = qdisc_priv(sch);
612 struct atm_flow_data *flow = (struct atm_flow_data *)cl;
613 struct nlattr *nest;
614
615 pr_debug("atm_tc_dump_class(sch %p,[qdisc %p],flow %p,skb %p,tcm %p)\n",
616 sch, p, flow, skb, tcm);
617 if (!find_flow(p, flow))
618 return -EINVAL;
619 tcm->tcm_handle = flow->classid;
620 tcm->tcm_info = flow->q->handle;
621
622 nest = nla_nest_start(skb, TCA_OPTIONS);
623 if (nest == NULL)
624 goto nla_put_failure;
625
626 NLA_PUT(skb, TCA_ATM_HDR, flow->hdr_len, flow->hdr);
627 if (flow->vcc) {
628 struct sockaddr_atmpvc pvc;
629 int state;
630
631 pvc.sap_family = AF_ATMPVC;
632 pvc.sap_addr.itf = flow->vcc->dev ? flow->vcc->dev->number : -1;
633 pvc.sap_addr.vpi = flow->vcc->vpi;
634 pvc.sap_addr.vci = flow->vcc->vci;
635 NLA_PUT(skb, TCA_ATM_ADDR, sizeof(pvc), &pvc);
636 state = ATM_VF2VS(flow->vcc->flags);
637 NLA_PUT_U32(skb, TCA_ATM_STATE, state);
638 }
639 if (flow->excess)
640 NLA_PUT_U32(skb, TCA_ATM_EXCESS, flow->classid);
641 else {
642 NLA_PUT_U32(skb, TCA_ATM_EXCESS, 0);
643 }
644
645 nla_nest_end(skb, nest);
646 return skb->len;
647
648 nla_put_failure:
649 nla_nest_cancel(skb, nest);
650 return -1;
651 }
652 static int
653 atm_tc_dump_class_stats(struct Qdisc *sch, unsigned long arg,
654 struct gnet_dump *d)
655 {
656 struct atm_flow_data *flow = (struct atm_flow_data *)arg;
657
658 flow->qstats.qlen = flow->q->q.qlen;
659
660 if (gnet_stats_copy_basic(d, &flow->bstats) < 0 ||
661 gnet_stats_copy_queue(d, &flow->qstats) < 0)
662 return -1;
663
664 return 0;
665 }
666
667 static int atm_tc_dump(struct Qdisc *sch, struct sk_buff *skb)
668 {
669 return 0;
670 }
671
672 static const struct Qdisc_class_ops atm_class_ops = {
673 .graft = atm_tc_graft,
674 .leaf = atm_tc_leaf,
675 .get = atm_tc_get,
676 .put = atm_tc_put,
677 .change = atm_tc_change,
678 .delete = atm_tc_delete,
679 .walk = atm_tc_walk,
680 .tcf_chain = atm_tc_find_tcf,
681 .bind_tcf = atm_tc_bind_filter,
682 .unbind_tcf = atm_tc_put,
683 .dump = atm_tc_dump_class,
684 .dump_stats = atm_tc_dump_class_stats,
685 };
686
687 static struct Qdisc_ops atm_qdisc_ops __read_mostly = {
688 .cl_ops = &atm_class_ops,
689 .id = "atm",
690 .priv_size = sizeof(struct atm_qdisc_data),
691 .enqueue = atm_tc_enqueue,
692 .dequeue = atm_tc_dequeue,
693 .peek = atm_tc_peek,
694 .drop = atm_tc_drop,
695 .init = atm_tc_init,
696 .reset = atm_tc_reset,
697 .destroy = atm_tc_destroy,
698 .dump = atm_tc_dump,
699 .owner = THIS_MODULE,
700 };
701
702 static int __init atm_init(void)
703 {
704 return register_qdisc(&atm_qdisc_ops);
705 }
706
707 static void __exit atm_exit(void)
708 {
709 unregister_qdisc(&atm_qdisc_ops);
710 }
711
712 module_init(atm_init)
713 module_exit(atm_exit)
714 MODULE_LICENSE("GPL");
(Inofficial) Linux kernel tree running on the Nao robot