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libertas: fix handling of command timeout, completion and interruption
[linux/fpc-iii.git] / net / sched / sch_atm.c
blob3f08158b8688e7128e9c363242eef43d99c3cfa9
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/slab.h>
7 #include <linux/init.h>
8 #include <linux/string.h>
9 #include <linux/errno.h>
10 #include <linux/skbuff.h>
11 #include <linux/atmdev.h>
12 #include <linux/atmclip.h>
13 #include <linux/rtnetlink.h>
14 #include <linux/file.h> /* for fput */
15 #include <net/netlink.h>
16 #include <net/pkt_sched.h>
17
18 extern struct socket *sockfd_lookup(int fd, int *err); /* @@@ fix this */
19
20 /*
21 * The ATM queuing discipline provides a framework for invoking classifiers
22 * (aka "filters"), which in turn select classes of this queuing discipline.
23 * Each class maps the flow(s) it is handling to a given VC. Multiple classes
24 * may share the same VC.
25 *
26 * When creating a class, VCs are specified by passing the number of the open
27 * socket descriptor by which the calling process references the VC. The kernel
28 * keeps the VC open at least until all classes using it are removed.
29 *
30 * In this file, most functions are named atm_tc_* to avoid confusion with all
31 * the atm_* in net/atm. This naming convention differs from what's used in the
32 * rest of net/sched.
33 *
34 * Known bugs:
35 * - sometimes messes up the IP stack
36 * - any manipulations besides the few operations described in the README, are
37 * untested and likely to crash the system
38 * - should lock the flow while there is data in the queue (?)
39 */
40
41 #define VCC2FLOW(vcc) ((struct atm_flow_data *) ((vcc)->user_back))
42
43 struct atm_flow_data {
44 struct Qdisc *q; /* FIFO, TBF, etc. */
45 struct tcf_proto *filter_list;
46 struct atm_vcc *vcc; /* VCC; NULL if VCC is closed */
47 void (*old_pop)(struct atm_vcc *vcc,
48 struct sk_buff *skb); /* chaining */
49 struct atm_qdisc_data *parent; /* parent qdisc */
50 struct socket *sock; /* for closing */
51 u32 classid; /* x:y type ID */
52 int ref; /* reference count */
53 struct gnet_stats_basic_packed bstats;
54 struct gnet_stats_queue qstats;
55 struct list_head list;
56 struct atm_flow_data *excess; /* flow for excess traffic;
57 NULL to set CLP instead */
58 int hdr_len;
59 unsigned char hdr[0]; /* header data; MUST BE LAST */
60 };
61
62 struct atm_qdisc_data {
63 struct atm_flow_data link; /* unclassified skbs go here */
64 struct list_head flows; /* NB: "link" is also on this
65 list */
66 struct tasklet_struct task; /* dequeue tasklet */
67 };
68
69 /* ------------------------- Class/flow operations ------------------------- */
70
71 static inline struct atm_flow_data *lookup_flow(struct Qdisc *sch, u32 classid)
72 {
73 struct atm_qdisc_data *p = qdisc_priv(sch);
74 struct atm_flow_data *flow;
75
76 list_for_each_entry(flow, &p->flows, list) {
77 if (flow->classid == classid)
78 return flow;
79 }
80 return NULL;
81 }
82
83 static int atm_tc_graft(struct Qdisc *sch, unsigned long arg,
84 struct Qdisc *new, struct Qdisc **old)
85 {
86 struct atm_qdisc_data *p = qdisc_priv(sch);
87 struct atm_flow_data *flow = (struct atm_flow_data *)arg;
88
89 pr_debug("atm_tc_graft(sch %p,[qdisc %p],flow %p,new %p,old %p)\n",
90 sch, p, flow, new, old);
91 if (list_empty(&flow->list))
92 return -EINVAL;
93 if (!new)
94 new = &noop_qdisc;
95 *old = flow->q;
96 flow->q = new;
97 if (*old)
98 qdisc_reset(*old);
99 return 0;
100 }
101
102 static struct Qdisc *atm_tc_leaf(struct Qdisc *sch, unsigned long cl)
103 {
104 struct atm_flow_data *flow = (struct atm_flow_data *)cl;
105
106 pr_debug("atm_tc_leaf(sch %p,flow %p)\n", sch, flow);
107 return flow ? flow->q : NULL;
108 }
109
110 static unsigned long atm_tc_get(struct Qdisc *sch, u32 classid)
111 {
112 struct atm_qdisc_data *p __maybe_unused = qdisc_priv(sch);
113 struct atm_flow_data *flow;
114
115 pr_debug("atm_tc_get(sch %p,[qdisc %p],classid %x)\n", sch, p, classid);
116 flow = lookup_flow(sch, classid);
117 if (flow)
118 flow->ref++;
119 pr_debug("atm_tc_get: flow %p\n", flow);
120 return (unsigned long)flow;
121 }
122
123 static unsigned long atm_tc_bind_filter(struct Qdisc *sch,
124 unsigned long parent, u32 classid)
125 {
126 return atm_tc_get(sch, classid);
127 }
128
129 /*
130 * atm_tc_put handles all destructions, including the ones that are explicitly
131 * requested (atm_tc_destroy, etc.). The assumption here is that we never drop
132 * anything that still seems to be in use.
133 */
134 static void atm_tc_put(struct Qdisc *sch, unsigned long cl)
135 {
136 struct atm_qdisc_data *p = qdisc_priv(sch);
137 struct atm_flow_data *flow = (struct atm_flow_data *)cl;
138
139 pr_debug("atm_tc_put(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
140 if (--flow->ref)
141 return;
142 pr_debug("atm_tc_put: destroying\n");
143 list_del_init(&flow->list);
144 pr_debug("atm_tc_put: qdisc %p\n", flow->q);
145 qdisc_destroy(flow->q);
146 tcf_destroy_chain(&flow->filter_list);
147 if (flow->sock) {
148 pr_debug("atm_tc_put: f_count %ld\n",
149 file_count(flow->sock->file));
150 flow->vcc->pop = flow->old_pop;
151 sockfd_put(flow->sock);
152 }
153 if (flow->excess)
154 atm_tc_put(sch, (unsigned long)flow->excess);
155 if (flow != &p->link)
156 kfree(flow);
157 /*
158 * If flow == &p->link, the qdisc no longer works at this point and
159 * needs to be removed. (By the caller of atm_tc_put.)
160 */
161 }
162
163 static void sch_atm_pop(struct atm_vcc *vcc, struct sk_buff *skb)
164 {
165 struct atm_qdisc_data *p = VCC2FLOW(vcc)->parent;
166
167 pr_debug("sch_atm_pop(vcc %p,skb %p,[qdisc %p])\n", vcc, skb, p);
168 VCC2FLOW(vcc)->old_pop(vcc, skb);
169 tasklet_schedule(&p->task);
170 }
171
172 static const u8 llc_oui_ip[] = {
173 0xaa, /* DSAP: non-ISO */
174 0xaa, /* SSAP: non-ISO */
175 0x03, /* Ctrl: Unnumbered Information Command PDU */
176 0x00, /* OUI: EtherType */
177 0x00, 0x00,
178 0x08, 0x00
179 }; /* Ethertype IP (0800) */
180
181 static const struct nla_policy atm_policy[TCA_ATM_MAX + 1] = {
182 [TCA_ATM_FD] = { .type = NLA_U32 },
183 [TCA_ATM_EXCESS] = { .type = NLA_U32 },
184 };
185
186 static int atm_tc_change(struct Qdisc *sch, u32 classid, u32 parent,
187 struct nlattr **tca, unsigned long *arg)
188 {
189 struct atm_qdisc_data *p = qdisc_priv(sch);
190 struct atm_flow_data *flow = (struct atm_flow_data *)*arg;
191 struct atm_flow_data *excess = NULL;
192 struct nlattr *opt = tca[TCA_OPTIONS];
193 struct nlattr *tb[TCA_ATM_MAX + 1];
194 struct socket *sock;
195 int fd, error, hdr_len;
196 void *hdr;
197
198 pr_debug("atm_tc_change(sch %p,[qdisc %p],classid %x,parent %x,"
199 "flow %p,opt %p)\n", sch, p, classid, parent, flow, opt);
200 /*
201 * The concept of parents doesn't apply for this qdisc.
202 */
203 if (parent && parent != TC_H_ROOT && parent != sch->handle)
204 return -EINVAL;
205 /*
206 * ATM classes cannot be changed. In order to change properties of the
207 * ATM connection, that socket needs to be modified directly (via the
208 * native ATM API. In order to send a flow to a different VC, the old
209 * class needs to be removed and a new one added. (This may be changed
210 * later.)
211 */
212 if (flow)
213 return -EBUSY;
214 if (opt == NULL)
215 return -EINVAL;
216
217 error = nla_parse_nested(tb, TCA_ATM_MAX, opt, atm_policy);
218 if (error < 0)
219 return error;
220
221 if (!tb[TCA_ATM_FD])
222 return -EINVAL;
223 fd = nla_get_u32(tb[TCA_ATM_FD]);
224 pr_debug("atm_tc_change: fd %d\n", fd);
225 if (tb[TCA_ATM_HDR]) {
226 hdr_len = nla_len(tb[TCA_ATM_HDR]);
227 hdr = nla_data(tb[TCA_ATM_HDR]);
228 } else {
229 hdr_len = RFC1483LLC_LEN;
230 hdr = NULL; /* default LLC/SNAP for IP */
231 }
232 if (!tb[TCA_ATM_EXCESS])
233 excess = NULL;
234 else {
235 excess = (struct atm_flow_data *)
236 atm_tc_get(sch, nla_get_u32(tb[TCA_ATM_EXCESS]));
237 if (!excess)
238 return -ENOENT;
239 }
240 pr_debug("atm_tc_change: type %d, payload %d, hdr_len %d\n",
241 opt->nla_type, nla_len(opt), hdr_len);
242 sock = sockfd_lookup(fd, &error);
243 if (!sock)
244 return error; /* f_count++ */
245 pr_debug("atm_tc_change: f_count %ld\n", file_count(sock->file));
246 if (sock->ops->family != PF_ATMSVC && sock->ops->family != PF_ATMPVC) {
247 error = -EPROTOTYPE;
248 goto err_out;
249 }
250 /* @@@ should check if the socket is really operational or we'll crash
251 on vcc->send */
252 if (classid) {
253 if (TC_H_MAJ(classid ^ sch->handle)) {
254 pr_debug("atm_tc_change: classid mismatch\n");
255 error = -EINVAL;
256 goto err_out;
257 }
258 } else {
259 int i;
260 unsigned long cl;
261
262 for (i = 1; i < 0x8000; i++) {
263 classid = TC_H_MAKE(sch->handle, 0x8000 | i);
264 cl = atm_tc_get(sch, classid);
265 if (!cl)
266 break;
267 atm_tc_put(sch, cl);
268 }
269 }
270 pr_debug("atm_tc_change: new id %x\n", classid);
271 flow = kzalloc(sizeof(struct atm_flow_data) + hdr_len, GFP_KERNEL);
272 pr_debug("atm_tc_change: flow %p\n", flow);
273 if (!flow) {
274 error = -ENOBUFS;
275 goto err_out;
276 }
277 flow->filter_list = NULL;
278 flow->q = qdisc_create_dflt(sch->dev_queue, &pfifo_qdisc_ops, classid);
279 if (!flow->q)
280 flow->q = &noop_qdisc;
281 pr_debug("atm_tc_change: qdisc %p\n", flow->q);
282 flow->sock = sock;
283 flow->vcc = ATM_SD(sock); /* speedup */
284 flow->vcc->user_back = flow;
285 pr_debug("atm_tc_change: vcc %p\n", flow->vcc);
286 flow->old_pop = flow->vcc->pop;
287 flow->parent = p;
288 flow->vcc->pop = sch_atm_pop;
289 flow->classid = classid;
290 flow->ref = 1;
291 flow->excess = excess;
292 list_add(&flow->list, &p->link.list);
293 flow->hdr_len = hdr_len;
294 if (hdr)
295 memcpy(flow->hdr, hdr, hdr_len);
296 else
297 memcpy(flow->hdr, llc_oui_ip, sizeof(llc_oui_ip));
298 *arg = (unsigned long)flow;
299 return 0;
300 err_out:
301 if (excess)
302 atm_tc_put(sch, (unsigned long)excess);
303 sockfd_put(sock);
304 return error;
305 }
306
307 static int atm_tc_delete(struct Qdisc *sch, unsigned long arg)
308 {
309 struct atm_qdisc_data *p = qdisc_priv(sch);
310 struct atm_flow_data *flow = (struct atm_flow_data *)arg;
311
312 pr_debug("atm_tc_delete(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
313 if (list_empty(&flow->list))
314 return -EINVAL;
315 if (flow->filter_list || flow == &p->link)
316 return -EBUSY;
317 /*
318 * Reference count must be 2: one for "keepalive" (set at class
319 * creation), and one for the reference held when calling delete.
320 */
321 if (flow->ref < 2) {
322 pr_err("atm_tc_delete: flow->ref == %d\n", flow->ref);
323 return -EINVAL;
324 }
325 if (flow->ref > 2)
326 return -EBUSY; /* catch references via excess, etc. */
327 atm_tc_put(sch, arg);
328 return 0;
329 }
330
331 static void atm_tc_walk(struct Qdisc *sch, struct qdisc_walker *walker)
332 {
333 struct atm_qdisc_data *p = qdisc_priv(sch);
334 struct atm_flow_data *flow;
335
336 pr_debug("atm_tc_walk(sch %p,[qdisc %p],walker %p)\n", sch, p, walker);
337 if (walker->stop)
338 return;
339 list_for_each_entry(flow, &p->flows, list) {
340 if (walker->count >= walker->skip &&
341 walker->fn(sch, (unsigned long)flow, walker) < 0) {
342 walker->stop = 1;
343 break;
344 }
345 walker->count++;
346 }
347 }
348
349 static struct tcf_proto **atm_tc_find_tcf(struct Qdisc *sch, unsigned long cl)
350 {
351 struct atm_qdisc_data *p = qdisc_priv(sch);
352 struct atm_flow_data *flow = (struct atm_flow_data *)cl;
353
354 pr_debug("atm_tc_find_tcf(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
355 return flow ? &flow->filter_list : &p->link.filter_list;
356 }
357
358 /* --------------------------- Qdisc operations ---------------------------- */
359
360 static int atm_tc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
361 {
362 struct atm_qdisc_data *p = qdisc_priv(sch);
363 struct atm_flow_data *flow;
364 struct tcf_result res;
365 int result;
366 int ret = NET_XMIT_POLICED;
367
368 pr_debug("atm_tc_enqueue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p);
369 result = TC_POLICE_OK; /* be nice to gcc */
370 flow = NULL;
371 if (TC_H_MAJ(skb->priority) != sch->handle ||
372 !(flow = (struct atm_flow_data *)atm_tc_get(sch, skb->priority))) {
373 list_for_each_entry(flow, &p->flows, list) {
374 if (flow->filter_list) {
375 result = tc_classify_compat(skb,
376 flow->filter_list,
377 &res);
378 if (result < 0)
379 continue;
380 flow = (struct atm_flow_data *)res.class;
381 if (!flow)
382 flow = lookup_flow(sch, res.classid);
383 goto done;
384 }
385 }
386 flow = NULL;
387 done:
388 ;
389 }
390 if (!flow) {
391 flow = &p->link;
392 } else {
393 if (flow->vcc)
394 ATM_SKB(skb)->atm_options = flow->vcc->atm_options;
395 /*@@@ looks good ... but it's not supposed to work :-) */
396 #ifdef CONFIG_NET_CLS_ACT
397 switch (result) {
398 case TC_ACT_QUEUED:
399 case TC_ACT_STOLEN:
400 kfree_skb(skb);
401 return NET_XMIT_SUCCESS | __NET_XMIT_STOLEN;
402 case TC_ACT_SHOT:
403 kfree_skb(skb);
404 goto drop;
405 case TC_POLICE_RECLASSIFY:
406 if (flow->excess)
407 flow = flow->excess;
408 else
409 ATM_SKB(skb)->atm_options |= ATM_ATMOPT_CLP;
410 break;
411 }
412 #endif
413 }
414
415 ret = qdisc_enqueue(skb, flow->q);
416 if (ret != NET_XMIT_SUCCESS) {
417 drop: __maybe_unused
418 if (net_xmit_drop_count(ret)) {
419 sch->qstats.drops++;
420 if (flow)
421 flow->qstats.drops++;
422 }
423 return ret;
424 }
425 qdisc_bstats_update(sch, skb);
426 bstats_update(&flow->bstats, skb);
427 /*
428 * Okay, this may seem weird. We pretend we've dropped the packet if
429 * it goes via ATM. The reason for this is that the outer qdisc
430 * expects to be able to q->dequeue the packet later on if we return
431 * success at this place. Also, sch->q.qdisc needs to reflect whether
432 * there is a packet egligible for dequeuing or not. Note that the
433 * statistics of the outer qdisc are necessarily wrong because of all
434 * this. There's currently no correct solution for this.
435 */
436 if (flow == &p->link) {
437 sch->q.qlen++;
438 return NET_XMIT_SUCCESS;
439 }
440 tasklet_schedule(&p->task);
441 return NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
442 }
443
444 /*
445 * Dequeue packets and send them over ATM. Note that we quite deliberately
446 * avoid checking net_device's flow control here, simply because sch_atm
447 * uses its own channels, which have nothing to do with any CLIP/LANE/or
448 * non-ATM interfaces.
449 */
450
451 static void sch_atm_dequeue(unsigned long data)
452 {
453 struct Qdisc *sch = (struct Qdisc *)data;
454 struct atm_qdisc_data *p = qdisc_priv(sch);
455 struct atm_flow_data *flow;
456 struct sk_buff *skb;
457
458 pr_debug("sch_atm_dequeue(sch %p,[qdisc %p])\n", sch, p);
459 list_for_each_entry(flow, &p->flows, list) {
460 if (flow == &p->link)
461 continue;
462 /*
463 * If traffic is properly shaped, this won't generate nasty
464 * little bursts. Otherwise, it may ... (but that's okay)
465 */
466 while ((skb = flow->q->ops->peek(flow->q))) {
467 if (!atm_may_send(flow->vcc, skb->truesize))
468 break;
469
470 skb = qdisc_dequeue_peeked(flow->q);
471 if (unlikely(!skb))
472 break;
473
474 pr_debug("atm_tc_dequeue: sending on class %p\n", flow);
475 /* remove any LL header somebody else has attached */
476 skb_pull(skb, skb_network_offset(skb));
477 if (skb_headroom(skb) < flow->hdr_len) {
478 struct sk_buff *new;
479
480 new = skb_realloc_headroom(skb, flow->hdr_len);
481 dev_kfree_skb(skb);
482 if (!new)
483 continue;
484 skb = new;
485 }
486 pr_debug("sch_atm_dequeue: ip %p, data %p\n",
487 skb_network_header(skb), skb->data);
488 ATM_SKB(skb)->vcc = flow->vcc;
489 memcpy(skb_push(skb, flow->hdr_len), flow->hdr,
490 flow->hdr_len);
491 atomic_add(skb->truesize,
492 &sk_atm(flow->vcc)->sk_wmem_alloc);
493 /* atm.atm_options are already set by atm_tc_enqueue */
494 flow->vcc->send(flow->vcc, skb);
495 }
496 }
497 }
498
499 static struct sk_buff *atm_tc_dequeue(struct Qdisc *sch)
500 {
501 struct atm_qdisc_data *p = qdisc_priv(sch);
502 struct sk_buff *skb;
503
504 pr_debug("atm_tc_dequeue(sch %p,[qdisc %p])\n", sch, p);
505 tasklet_schedule(&p->task);
506 skb = qdisc_dequeue_peeked(p->link.q);
507 if (skb)
508 sch->q.qlen--;
509 return skb;
510 }
511
512 static struct sk_buff *atm_tc_peek(struct Qdisc *sch)
513 {
514 struct atm_qdisc_data *p = qdisc_priv(sch);
515
516 pr_debug("atm_tc_peek(sch %p,[qdisc %p])\n", sch, p);
517
518 return p->link.q->ops->peek(p->link.q);
519 }
520
521 static unsigned int atm_tc_drop(struct Qdisc *sch)
522 {
523 struct atm_qdisc_data *p = qdisc_priv(sch);
524 struct atm_flow_data *flow;
525 unsigned int len;
526
527 pr_debug("atm_tc_drop(sch %p,[qdisc %p])\n", sch, p);
528 list_for_each_entry(flow, &p->flows, list) {
529 if (flow->q->ops->drop && (len = flow->q->ops->drop(flow->q)))
530 return len;
531 }
532 return 0;
533 }
534
535 static int atm_tc_init(struct Qdisc *sch, struct nlattr *opt)
536 {
537 struct atm_qdisc_data *p = qdisc_priv(sch);
538
539 pr_debug("atm_tc_init(sch %p,[qdisc %p],opt %p)\n", sch, p, opt);
540 INIT_LIST_HEAD(&p->flows);
541 INIT_LIST_HEAD(&p->link.list);
542 list_add(&p->link.list, &p->flows);
543 p->link.q = qdisc_create_dflt(sch->dev_queue,
544 &pfifo_qdisc_ops, sch->handle);
545 if (!p->link.q)
546 p->link.q = &noop_qdisc;
547 pr_debug("atm_tc_init: link (%p) qdisc %p\n", &p->link, p->link.q);
548 p->link.filter_list = NULL;
549 p->link.vcc = NULL;
550 p->link.sock = NULL;
551 p->link.classid = sch->handle;
552 p->link.ref = 1;
553 tasklet_init(&p->task, sch_atm_dequeue, (unsigned long)sch);
554 return 0;
555 }
556
557 static void atm_tc_reset(struct Qdisc *sch)
558 {
559 struct atm_qdisc_data *p = qdisc_priv(sch);
560 struct atm_flow_data *flow;
561
562 pr_debug("atm_tc_reset(sch %p,[qdisc %p])\n", sch, p);
563 list_for_each_entry(flow, &p->flows, list)
564 qdisc_reset(flow->q);
565 sch->q.qlen = 0;
566 }
567
568 static void atm_tc_destroy(struct Qdisc *sch)
569 {
570 struct atm_qdisc_data *p = qdisc_priv(sch);
571 struct atm_flow_data *flow, *tmp;
572
573 pr_debug("atm_tc_destroy(sch %p,[qdisc %p])\n", sch, p);
574 list_for_each_entry(flow, &p->flows, list)
575 tcf_destroy_chain(&flow->filter_list);
576
577 list_for_each_entry_safe(flow, tmp, &p->flows, list) {
578 if (flow->ref > 1)
579 pr_err("atm_destroy: %p->ref = %d\n", flow, flow->ref);
580 atm_tc_put(sch, (unsigned long)flow);
581 }
582 tasklet_kill(&p->task);
583 }
584
585 static int atm_tc_dump_class(struct Qdisc *sch, unsigned long cl,
586 struct sk_buff *skb, struct tcmsg *tcm)
587 {
588 struct atm_qdisc_data *p = qdisc_priv(sch);
589 struct atm_flow_data *flow = (struct atm_flow_data *)cl;
590 struct nlattr *nest;
591
592 pr_debug("atm_tc_dump_class(sch %p,[qdisc %p],flow %p,skb %p,tcm %p)\n",
593 sch, p, flow, skb, tcm);
594 if (list_empty(&flow->list))
595 return -EINVAL;
596 tcm->tcm_handle = flow->classid;
597 tcm->tcm_info = flow->q->handle;
598
599 nest = nla_nest_start(skb, TCA_OPTIONS);
600 if (nest == NULL)
601 goto nla_put_failure;
602
603 NLA_PUT(skb, TCA_ATM_HDR, flow->hdr_len, flow->hdr);
604 if (flow->vcc) {
605 struct sockaddr_atmpvc pvc;
606 int state;
607
608 pvc.sap_family = AF_ATMPVC;
609 pvc.sap_addr.itf = flow->vcc->dev ? flow->vcc->dev->number : -1;
610 pvc.sap_addr.vpi = flow->vcc->vpi;
611 pvc.sap_addr.vci = flow->vcc->vci;
612 NLA_PUT(skb, TCA_ATM_ADDR, sizeof(pvc), &pvc);
613 state = ATM_VF2VS(flow->vcc->flags);
614 NLA_PUT_U32(skb, TCA_ATM_STATE, state);
615 }
616 if (flow->excess)
617 NLA_PUT_U32(skb, TCA_ATM_EXCESS, flow->classid);
618 else
619 NLA_PUT_U32(skb, TCA_ATM_EXCESS, 0);
620
621 nla_nest_end(skb, nest);
622 return skb->len;
623
624 nla_put_failure:
625 nla_nest_cancel(skb, nest);
626 return -1;
627 }
628 static int
629 atm_tc_dump_class_stats(struct Qdisc *sch, unsigned long arg,
630 struct gnet_dump *d)
631 {
632 struct atm_flow_data *flow = (struct atm_flow_data *)arg;
633
634 flow->qstats.qlen = flow->q->q.qlen;
635
636 if (gnet_stats_copy_basic(d, &flow->bstats) < 0 ||
637 gnet_stats_copy_queue(d, &flow->qstats) < 0)
638 return -1;
639
640 return 0;
641 }
642
643 static int atm_tc_dump(struct Qdisc *sch, struct sk_buff *skb)
644 {
645 return 0;
646 }
647
648 static const struct Qdisc_class_ops atm_class_ops = {
649 .graft = atm_tc_graft,
650 .leaf = atm_tc_leaf,
651 .get = atm_tc_get,
652 .put = atm_tc_put,
653 .change = atm_tc_change,
654 .delete = atm_tc_delete,
655 .walk = atm_tc_walk,
656 .tcf_chain = atm_tc_find_tcf,
657 .bind_tcf = atm_tc_bind_filter,
658 .unbind_tcf = atm_tc_put,
659 .dump = atm_tc_dump_class,
660 .dump_stats = atm_tc_dump_class_stats,
661 };
662
663 static struct Qdisc_ops atm_qdisc_ops __read_mostly = {
664 .cl_ops = &atm_class_ops,
665 .id = "atm",
666 .priv_size = sizeof(struct atm_qdisc_data),
667 .enqueue = atm_tc_enqueue,
668 .dequeue = atm_tc_dequeue,
669 .peek = atm_tc_peek,
670 .drop = atm_tc_drop,
671 .init = atm_tc_init,
672 .reset = atm_tc_reset,
673 .destroy = atm_tc_destroy,
674 .dump = atm_tc_dump,
675 .owner = THIS_MODULE,
676 };
677
678 static int __init atm_init(void)
679 {
680 return register_qdisc(&atm_qdisc_ops);
681 }
682
683 static void __exit atm_exit(void)
684 {
685 unregister_qdisc(&atm_qdisc_ops);
686 }
687
688 module_init(atm_init)
689 module_exit(atm_exit)
690 MODULE_LICENSE("GPL");
Linux with added FPC-III support