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fs/Makefile: Stupid typo breakage of exofs inclusion
[linux-btrfs-devel.git] / net / sched / sch_atm.c
blobe25e49061a0d4370ee02f759ab37dc09f3083d03
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/interrupt.h>
9 #include <linux/string.h>
10 #include <linux/errno.h>
11 #include <linux/skbuff.h>
12 #include <linux/atmdev.h>
13 #include <linux/atmclip.h>
14 #include <linux/rtnetlink.h>
15 #include <linux/file.h> /* for fput */
16 #include <net/netlink.h>
17 #include <net/pkt_sched.h>
18
19 extern struct socket *sockfd_lookup(int fd, int *err); /* @@@ fix this */
20
21 /*
22 * The ATM queuing discipline provides a framework for invoking classifiers
23 * (aka "filters"), which in turn select classes of this queuing discipline.
24 * Each class maps the flow(s) it is handling to a given VC. Multiple classes
25 * may share the same VC.
26 *
27 * When creating a class, VCs are specified by passing the number of the open
28 * socket descriptor by which the calling process references the VC. The kernel
29 * keeps the VC open at least until all classes using it are removed.
30 *
31 * In this file, most functions are named atm_tc_* to avoid confusion with all
32 * the atm_* in net/atm. This naming convention differs from what's used in the
33 * rest of net/sched.
34 *
35 * Known bugs:
36 * - sometimes messes up the IP stack
37 * - any manipulations besides the few operations described in the README, are
38 * untested and likely to crash the system
39 * - should lock the flow while there is data in the queue (?)
40 */
41
42 #define VCC2FLOW(vcc) ((struct atm_flow_data *) ((vcc)->user_back))
43
44 struct atm_flow_data {
45 struct Qdisc *q; /* FIFO, TBF, etc. */
46 struct tcf_proto *filter_list;
47 struct atm_vcc *vcc; /* VCC; NULL if VCC is closed */
48 void (*old_pop)(struct atm_vcc *vcc,
49 struct sk_buff *skb); /* chaining */
50 struct atm_qdisc_data *parent; /* parent qdisc */
51 struct socket *sock; /* for closing */
52 u32 classid; /* x:y type ID */
53 int ref; /* reference count */
54 struct gnet_stats_basic_packed bstats;
55 struct gnet_stats_queue qstats;
56 struct list_head list;
57 struct atm_flow_data *excess; /* flow for excess traffic;
58 NULL to set CLP instead */
59 int hdr_len;
60 unsigned char hdr[0]; /* header data; MUST BE LAST */
61 };
62
63 struct atm_qdisc_data {
64 struct atm_flow_data link; /* unclassified skbs go here */
65 struct list_head flows; /* NB: "link" is also on this
66 list */
67 struct tasklet_struct task; /* dequeue tasklet */
68 };
69
70 /* ------------------------- Class/flow operations ------------------------- */
71
72 static inline struct atm_flow_data *lookup_flow(struct Qdisc *sch, u32 classid)
73 {
74 struct atm_qdisc_data *p = qdisc_priv(sch);
75 struct atm_flow_data *flow;
76
77 list_for_each_entry(flow, &p->flows, list) {
78 if (flow->classid == classid)
79 return flow;
80 }
81 return NULL;
82 }
83
84 static int atm_tc_graft(struct Qdisc *sch, unsigned long arg,
85 struct Qdisc *new, struct Qdisc **old)
86 {
87 struct atm_qdisc_data *p = qdisc_priv(sch);
88 struct atm_flow_data *flow = (struct atm_flow_data *)arg;
89
90 pr_debug("atm_tc_graft(sch %p,[qdisc %p],flow %p,new %p,old %p)\n",
91 sch, p, flow, new, old);
92 if (list_empty(&flow->list))
93 return -EINVAL;
94 if (!new)
95 new = &noop_qdisc;
96 *old = flow->q;
97 flow->q = new;
98 if (*old)
99 qdisc_reset(*old);
100 return 0;
101 }
102
103 static struct Qdisc *atm_tc_leaf(struct Qdisc *sch, unsigned long cl)
104 {
105 struct atm_flow_data *flow = (struct atm_flow_data *)cl;
106
107 pr_debug("atm_tc_leaf(sch %p,flow %p)\n", sch, flow);
108 return flow ? flow->q : NULL;
109 }
110
111 static unsigned long atm_tc_get(struct Qdisc *sch, u32 classid)
112 {
113 struct atm_qdisc_data *p __maybe_unused = qdisc_priv(sch);
114 struct atm_flow_data *flow;
115
116 pr_debug("atm_tc_get(sch %p,[qdisc %p],classid %x)\n", sch, p, classid);
117 flow = lookup_flow(sch, classid);
118 if (flow)
119 flow->ref++;
120 pr_debug("atm_tc_get: flow %p\n", flow);
121 return (unsigned long)flow;
122 }
123
124 static unsigned long atm_tc_bind_filter(struct Qdisc *sch,
125 unsigned long parent, u32 classid)
126 {
127 return atm_tc_get(sch, classid);
128 }
129
130 /*
131 * atm_tc_put handles all destructions, including the ones that are explicitly
132 * requested (atm_tc_destroy, etc.). The assumption here is that we never drop
133 * anything that still seems to be in use.
134 */
135 static void atm_tc_put(struct Qdisc *sch, unsigned long cl)
136 {
137 struct atm_qdisc_data *p = qdisc_priv(sch);
138 struct atm_flow_data *flow = (struct atm_flow_data *)cl;
139
140 pr_debug("atm_tc_put(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
141 if (--flow->ref)
142 return;
143 pr_debug("atm_tc_put: destroying\n");
144 list_del_init(&flow->list);
145 pr_debug("atm_tc_put: qdisc %p\n", flow->q);
146 qdisc_destroy(flow->q);
147 tcf_destroy_chain(&flow->filter_list);
148 if (flow->sock) {
149 pr_debug("atm_tc_put: f_count %ld\n",
150 file_count(flow->sock->file));
151 flow->vcc->pop = flow->old_pop;
152 sockfd_put(flow->sock);
153 }
154 if (flow->excess)
155 atm_tc_put(sch, (unsigned long)flow->excess);
156 if (flow != &p->link)
157 kfree(flow);
158 /*
159 * If flow == &p->link, the qdisc no longer works at this point and
160 * needs to be removed. (By the caller of atm_tc_put.)
161 */
162 }
163
164 static void sch_atm_pop(struct atm_vcc *vcc, struct sk_buff *skb)
165 {
166 struct atm_qdisc_data *p = VCC2FLOW(vcc)->parent;
167
168 pr_debug("sch_atm_pop(vcc %p,skb %p,[qdisc %p])\n", vcc, skb, p);
169 VCC2FLOW(vcc)->old_pop(vcc, skb);
170 tasklet_schedule(&p->task);
171 }
172
173 static const u8 llc_oui_ip[] = {
174 0xaa, /* DSAP: non-ISO */
175 0xaa, /* SSAP: non-ISO */
176 0x03, /* Ctrl: Unnumbered Information Command PDU */
177 0x00, /* OUI: EtherType */
178 0x00, 0x00,
179 0x08, 0x00
180 }; /* Ethertype IP (0800) */
181
182 static const struct nla_policy atm_policy[TCA_ATM_MAX + 1] = {
183 [TCA_ATM_FD] = { .type = NLA_U32 },
184 [TCA_ATM_EXCESS] = { .type = NLA_U32 },
185 };
186
187 static int atm_tc_change(struct Qdisc *sch, u32 classid, u32 parent,
188 struct nlattr **tca, unsigned long *arg)
189 {
190 struct atm_qdisc_data *p = qdisc_priv(sch);
191 struct atm_flow_data *flow = (struct atm_flow_data *)*arg;
192 struct atm_flow_data *excess = NULL;
193 struct nlattr *opt = tca[TCA_OPTIONS];
194 struct nlattr *tb[TCA_ATM_MAX + 1];
195 struct socket *sock;
196 int fd, error, hdr_len;
197 void *hdr;
198
199 pr_debug("atm_tc_change(sch %p,[qdisc %p],classid %x,parent %x,"
200 "flow %p,opt %p)\n", sch, p, classid, parent, flow, opt);
201 /*
202 * The concept of parents doesn't apply for this qdisc.
203 */
204 if (parent && parent != TC_H_ROOT && parent != sch->handle)
205 return -EINVAL;
206 /*
207 * ATM classes cannot be changed. In order to change properties of the
208 * ATM connection, that socket needs to be modified directly (via the
209 * native ATM API. In order to send a flow to a different VC, the old
210 * class needs to be removed and a new one added. (This may be changed
211 * later.)
212 */
213 if (flow)
214 return -EBUSY;
215 if (opt == NULL)
216 return -EINVAL;
217
218 error = nla_parse_nested(tb, TCA_ATM_MAX, opt, atm_policy);
219 if (error < 0)
220 return error;
221
222 if (!tb[TCA_ATM_FD])
223 return -EINVAL;
224 fd = nla_get_u32(tb[TCA_ATM_FD]);
225 pr_debug("atm_tc_change: fd %d\n", fd);
226 if (tb[TCA_ATM_HDR]) {
227 hdr_len = nla_len(tb[TCA_ATM_HDR]);
228 hdr = nla_data(tb[TCA_ATM_HDR]);
229 } else {
230 hdr_len = RFC1483LLC_LEN;
231 hdr = NULL; /* default LLC/SNAP for IP */
232 }
233 if (!tb[TCA_ATM_EXCESS])
234 excess = NULL;
235 else {
236 excess = (struct atm_flow_data *)
237 atm_tc_get(sch, nla_get_u32(tb[TCA_ATM_EXCESS]));
238 if (!excess)
239 return -ENOENT;
240 }
241 pr_debug("atm_tc_change: type %d, payload %d, hdr_len %d\n",
242 opt->nla_type, nla_len(opt), hdr_len);
243 sock = sockfd_lookup(fd, &error);
244 if (!sock)
245 return error; /* f_count++ */
246 pr_debug("atm_tc_change: f_count %ld\n", file_count(sock->file));
247 if (sock->ops->family != PF_ATMSVC && sock->ops->family != PF_ATMPVC) {
248 error = -EPROTOTYPE;
249 goto err_out;
250 }
251 /* @@@ should check if the socket is really operational or we'll crash
252 on vcc->send */
253 if (classid) {
254 if (TC_H_MAJ(classid ^ sch->handle)) {
255 pr_debug("atm_tc_change: classid mismatch\n");
256 error = -EINVAL;
257 goto err_out;
258 }
259 } else {
260 int i;
261 unsigned long cl;
262
263 for (i = 1; i < 0x8000; i++) {
264 classid = TC_H_MAKE(sch->handle, 0x8000 | i);
265 cl = atm_tc_get(sch, classid);
266 if (!cl)
267 break;
268 atm_tc_put(sch, cl);
269 }
270 }
271 pr_debug("atm_tc_change: new id %x\n", classid);
272 flow = kzalloc(sizeof(struct atm_flow_data) + hdr_len, GFP_KERNEL);
273 pr_debug("atm_tc_change: flow %p\n", flow);
274 if (!flow) {
275 error = -ENOBUFS;
276 goto err_out;
277 }
278 flow->filter_list = NULL;
279 flow->q = qdisc_create_dflt(sch->dev_queue, &pfifo_qdisc_ops, classid);
280 if (!flow->q)
281 flow->q = &noop_qdisc;
282 pr_debug("atm_tc_change: qdisc %p\n", flow->q);
283 flow->sock = sock;
284 flow->vcc = ATM_SD(sock); /* speedup */
285 flow->vcc->user_back = flow;
286 pr_debug("atm_tc_change: vcc %p\n", flow->vcc);
287 flow->old_pop = flow->vcc->pop;
288 flow->parent = p;
289 flow->vcc->pop = sch_atm_pop;
290 flow->classid = classid;
291 flow->ref = 1;
292 flow->excess = excess;
293 list_add(&flow->list, &p->link.list);
294 flow->hdr_len = hdr_len;
295 if (hdr)
296 memcpy(flow->hdr, hdr, hdr_len);
297 else
298 memcpy(flow->hdr, llc_oui_ip, sizeof(llc_oui_ip));
299 *arg = (unsigned long)flow;
300 return 0;
301 err_out:
302 if (excess)
303 atm_tc_put(sch, (unsigned long)excess);
304 sockfd_put(sock);
305 return error;
306 }
307
308 static int atm_tc_delete(struct Qdisc *sch, unsigned long arg)
309 {
310 struct atm_qdisc_data *p = qdisc_priv(sch);
311 struct atm_flow_data *flow = (struct atm_flow_data *)arg;
312
313 pr_debug("atm_tc_delete(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
314 if (list_empty(&flow->list))
315 return -EINVAL;
316 if (flow->filter_list || flow == &p->link)
317 return -EBUSY;
318 /*
319 * Reference count must be 2: one for "keepalive" (set at class
320 * creation), and one for the reference held when calling delete.
321 */
322 if (flow->ref < 2) {
323 pr_err("atm_tc_delete: flow->ref == %d\n", flow->ref);
324 return -EINVAL;
325 }
326 if (flow->ref > 2)
327 return -EBUSY; /* catch references via excess, etc. */
328 atm_tc_put(sch, arg);
329 return 0;
330 }
331
332 static void atm_tc_walk(struct Qdisc *sch, struct qdisc_walker *walker)
333 {
334 struct atm_qdisc_data *p = qdisc_priv(sch);
335 struct atm_flow_data *flow;
336
337 pr_debug("atm_tc_walk(sch %p,[qdisc %p],walker %p)\n", sch, p, walker);
338 if (walker->stop)
339 return;
340 list_for_each_entry(flow, &p->flows, list) {
341 if (walker->count >= walker->skip &&
342 walker->fn(sch, (unsigned long)flow, walker) < 0) {
343 walker->stop = 1;
344 break;
345 }
346 walker->count++;
347 }
348 }
349
350 static struct tcf_proto **atm_tc_find_tcf(struct Qdisc *sch, unsigned long cl)
351 {
352 struct atm_qdisc_data *p = qdisc_priv(sch);
353 struct atm_flow_data *flow = (struct atm_flow_data *)cl;
354
355 pr_debug("atm_tc_find_tcf(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
356 return flow ? &flow->filter_list : &p->link.filter_list;
357 }
358
359 /* --------------------------- Qdisc operations ---------------------------- */
360
361 static int atm_tc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
362 {
363 struct atm_qdisc_data *p = qdisc_priv(sch);
364 struct atm_flow_data *flow;
365 struct tcf_result res;
366 int result;
367 int ret = NET_XMIT_POLICED;
368
369 pr_debug("atm_tc_enqueue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p);
370 result = TC_POLICE_OK; /* be nice to gcc */
371 flow = NULL;
372 if (TC_H_MAJ(skb->priority) != sch->handle ||
373 !(flow = (struct atm_flow_data *)atm_tc_get(sch, skb->priority))) {
374 list_for_each_entry(flow, &p->flows, list) {
375 if (flow->filter_list) {
376 result = tc_classify_compat(skb,
377 flow->filter_list,
378 &res);
379 if (result < 0)
380 continue;
381 flow = (struct atm_flow_data *)res.class;
382 if (!flow)
383 flow = lookup_flow(sch, res.classid);
384 goto done;
385 }
386 }
387 flow = NULL;
388 done:
389 ;
390 }
391 if (!flow) {
392 flow = &p->link;
393 } else {
394 if (flow->vcc)
395 ATM_SKB(skb)->atm_options = flow->vcc->atm_options;
396 /*@@@ looks good ... but it's not supposed to work :-) */
397 #ifdef CONFIG_NET_CLS_ACT
398 switch (result) {
399 case TC_ACT_QUEUED:
400 case TC_ACT_STOLEN:
401 kfree_skb(skb);
402 return NET_XMIT_SUCCESS | __NET_XMIT_STOLEN;
403 case TC_ACT_SHOT:
404 kfree_skb(skb);
405 goto drop;
406 case TC_POLICE_RECLASSIFY:
407 if (flow->excess)
408 flow = flow->excess;
409 else
410 ATM_SKB(skb)->atm_options |= ATM_ATMOPT_CLP;
411 break;
412 }
413 #endif
414 }
415
416 ret = qdisc_enqueue(skb, flow->q);
417 if (ret != NET_XMIT_SUCCESS) {
418 drop: __maybe_unused
419 if (net_xmit_drop_count(ret)) {
420 sch->qstats.drops++;
421 if (flow)
422 flow->qstats.drops++;
423 }
424 return ret;
425 }
426 qdisc_bstats_update(sch, skb);
427 bstats_update(&flow->bstats, skb);
428 /*
429 * Okay, this may seem weird. We pretend we've dropped the packet if
430 * it goes via ATM. The reason for this is that the outer qdisc
431 * expects to be able to q->dequeue the packet later on if we return
432 * success at this place. Also, sch->q.qdisc needs to reflect whether
433 * there is a packet egligible for dequeuing or not. Note that the
434 * statistics of the outer qdisc are necessarily wrong because of all
435 * this. There's currently no correct solution for this.
436 */
437 if (flow == &p->link) {
438 sch->q.qlen++;
439 return NET_XMIT_SUCCESS;
440 }
441 tasklet_schedule(&p->task);
442 return NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
443 }
444
445 /*
446 * Dequeue packets and send them over ATM. Note that we quite deliberately
447 * avoid checking net_device's flow control here, simply because sch_atm
448 * uses its own channels, which have nothing to do with any CLIP/LANE/or
449 * non-ATM interfaces.
450 */
451
452 static void sch_atm_dequeue(unsigned long data)
453 {
454 struct Qdisc *sch = (struct Qdisc *)data;
455 struct atm_qdisc_data *p = qdisc_priv(sch);
456 struct atm_flow_data *flow;
457 struct sk_buff *skb;
458
459 pr_debug("sch_atm_dequeue(sch %p,[qdisc %p])\n", sch, p);
460 list_for_each_entry(flow, &p->flows, list) {
461 if (flow == &p->link)
462 continue;
463 /*
464 * If traffic is properly shaped, this won't generate nasty
465 * little bursts. Otherwise, it may ... (but that's okay)
466 */
467 while ((skb = flow->q->ops->peek(flow->q))) {
468 if (!atm_may_send(flow->vcc, skb->truesize))
469 break;
470
471 skb = qdisc_dequeue_peeked(flow->q);
472 if (unlikely(!skb))
473 break;
474
475 pr_debug("atm_tc_dequeue: sending on class %p\n", flow);
476 /* remove any LL header somebody else has attached */
477 skb_pull(skb, skb_network_offset(skb));
478 if (skb_headroom(skb) < flow->hdr_len) {
479 struct sk_buff *new;
480
481 new = skb_realloc_headroom(skb, flow->hdr_len);
482 dev_kfree_skb(skb);
483 if (!new)
484 continue;
485 skb = new;
486 }
487 pr_debug("sch_atm_dequeue: ip %p, data %p\n",
488 skb_network_header(skb), skb->data);
489 ATM_SKB(skb)->vcc = flow->vcc;
490 memcpy(skb_push(skb, flow->hdr_len), flow->hdr,
491 flow->hdr_len);
492 atomic_add(skb->truesize,
493 &sk_atm(flow->vcc)->sk_wmem_alloc);
494 /* atm.atm_options are already set by atm_tc_enqueue */
495 flow->vcc->send(flow->vcc, skb);
496 }
497 }
498 }
499
500 static struct sk_buff *atm_tc_dequeue(struct Qdisc *sch)
501 {
502 struct atm_qdisc_data *p = qdisc_priv(sch);
503 struct sk_buff *skb;
504
505 pr_debug("atm_tc_dequeue(sch %p,[qdisc %p])\n", sch, p);
506 tasklet_schedule(&p->task);
507 skb = qdisc_dequeue_peeked(p->link.q);
508 if (skb)
509 sch->q.qlen--;
510 return skb;
511 }
512
513 static struct sk_buff *atm_tc_peek(struct Qdisc *sch)
514 {
515 struct atm_qdisc_data *p = qdisc_priv(sch);
516
517 pr_debug("atm_tc_peek(sch %p,[qdisc %p])\n", sch, p);
518
519 return p->link.q->ops->peek(p->link.q);
520 }
521
522 static unsigned int atm_tc_drop(struct Qdisc *sch)
523 {
524 struct atm_qdisc_data *p = qdisc_priv(sch);
525 struct atm_flow_data *flow;
526 unsigned int len;
527
528 pr_debug("atm_tc_drop(sch %p,[qdisc %p])\n", sch, p);
529 list_for_each_entry(flow, &p->flows, list) {
530 if (flow->q->ops->drop && (len = flow->q->ops->drop(flow->q)))
531 return len;
532 }
533 return 0;
534 }
535
536 static int atm_tc_init(struct Qdisc *sch, struct nlattr *opt)
537 {
538 struct atm_qdisc_data *p = qdisc_priv(sch);
539
540 pr_debug("atm_tc_init(sch %p,[qdisc %p],opt %p)\n", sch, p, opt);
541 INIT_LIST_HEAD(&p->flows);
542 INIT_LIST_HEAD(&p->link.list);
543 list_add(&p->link.list, &p->flows);
544 p->link.q = qdisc_create_dflt(sch->dev_queue,
545 &pfifo_qdisc_ops, sch->handle);
546 if (!p->link.q)
547 p->link.q = &noop_qdisc;
548 pr_debug("atm_tc_init: link (%p) qdisc %p\n", &p->link, p->link.q);
549 p->link.filter_list = NULL;
550 p->link.vcc = NULL;
551 p->link.sock = NULL;
552 p->link.classid = sch->handle;
553 p->link.ref = 1;
554 tasklet_init(&p->task, sch_atm_dequeue, (unsigned long)sch);
555 return 0;
556 }
557
558 static void atm_tc_reset(struct Qdisc *sch)
559 {
560 struct atm_qdisc_data *p = qdisc_priv(sch);
561 struct atm_flow_data *flow;
562
563 pr_debug("atm_tc_reset(sch %p,[qdisc %p])\n", sch, p);
564 list_for_each_entry(flow, &p->flows, list)
565 qdisc_reset(flow->q);
566 sch->q.qlen = 0;
567 }
568
569 static void atm_tc_destroy(struct Qdisc *sch)
570 {
571 struct atm_qdisc_data *p = qdisc_priv(sch);
572 struct atm_flow_data *flow, *tmp;
573
574 pr_debug("atm_tc_destroy(sch %p,[qdisc %p])\n", sch, p);
575 list_for_each_entry(flow, &p->flows, list)
576 tcf_destroy_chain(&flow->filter_list);
577
578 list_for_each_entry_safe(flow, tmp, &p->flows, list) {
579 if (flow->ref > 1)
580 pr_err("atm_destroy: %p->ref = %d\n", flow, flow->ref);
581 atm_tc_put(sch, (unsigned long)flow);
582 }
583 tasklet_kill(&p->task);
584 }
585
586 static int atm_tc_dump_class(struct Qdisc *sch, unsigned long cl,
587 struct sk_buff *skb, struct tcmsg *tcm)
588 {
589 struct atm_qdisc_data *p = qdisc_priv(sch);
590 struct atm_flow_data *flow = (struct atm_flow_data *)cl;
591 struct nlattr *nest;
592
593 pr_debug("atm_tc_dump_class(sch %p,[qdisc %p],flow %p,skb %p,tcm %p)\n",
594 sch, p, flow, skb, tcm);
595 if (list_empty(&flow->list))
596 return -EINVAL;
597 tcm->tcm_handle = flow->classid;
598 tcm->tcm_info = flow->q->handle;
599
600 nest = nla_nest_start(skb, TCA_OPTIONS);
601 if (nest == NULL)
602 goto nla_put_failure;
603
604 NLA_PUT(skb, TCA_ATM_HDR, flow->hdr_len, flow->hdr);
605 if (flow->vcc) {
606 struct sockaddr_atmpvc pvc;
607 int state;
608
609 pvc.sap_family = AF_ATMPVC;
610 pvc.sap_addr.itf = flow->vcc->dev ? flow->vcc->dev->number : -1;
611 pvc.sap_addr.vpi = flow->vcc->vpi;
612 pvc.sap_addr.vci = flow->vcc->vci;
613 NLA_PUT(skb, TCA_ATM_ADDR, sizeof(pvc), &pvc);
614 state = ATM_VF2VS(flow->vcc->flags);
615 NLA_PUT_U32(skb, TCA_ATM_STATE, state);
616 }
617 if (flow->excess)
618 NLA_PUT_U32(skb, TCA_ATM_EXCESS, flow->classid);
619 else
620 NLA_PUT_U32(skb, TCA_ATM_EXCESS, 0);
621
622 nla_nest_end(skb, nest);
623 return skb->len;
624
625 nla_put_failure:
626 nla_nest_cancel(skb, nest);
627 return -1;
628 }
629 static int
630 atm_tc_dump_class_stats(struct Qdisc *sch, unsigned long arg,
631 struct gnet_dump *d)
632 {
633 struct atm_flow_data *flow = (struct atm_flow_data *)arg;
634
635 flow->qstats.qlen = flow->q->q.qlen;
636
637 if (gnet_stats_copy_basic(d, &flow->bstats) < 0 ||
638 gnet_stats_copy_queue(d, &flow->qstats) < 0)
639 return -1;
640
641 return 0;
642 }
643
644 static int atm_tc_dump(struct Qdisc *sch, struct sk_buff *skb)
645 {
646 return 0;
647 }
648
649 static const struct Qdisc_class_ops atm_class_ops = {
650 .graft = atm_tc_graft,
651 .leaf = atm_tc_leaf,
652 .get = atm_tc_get,
653 .put = atm_tc_put,
654 .change = atm_tc_change,
655 .delete = atm_tc_delete,
656 .walk = atm_tc_walk,
657 .tcf_chain = atm_tc_find_tcf,
658 .bind_tcf = atm_tc_bind_filter,
659 .unbind_tcf = atm_tc_put,
660 .dump = atm_tc_dump_class,
661 .dump_stats = atm_tc_dump_class_stats,
662 };
663
664 static struct Qdisc_ops atm_qdisc_ops __read_mostly = {
665 .cl_ops = &atm_class_ops,
666 .id = "atm",
667 .priv_size = sizeof(struct atm_qdisc_data),
668 .enqueue = atm_tc_enqueue,
669 .dequeue = atm_tc_dequeue,
670 .peek = atm_tc_peek,
671 .drop = atm_tc_drop,
672 .init = atm_tc_init,
673 .reset = atm_tc_reset,
674 .destroy = atm_tc_destroy,
675 .dump = atm_tc_dump,
676 .owner = THIS_MODULE,
677 };
678
679 static int __init atm_init(void)
680 {
681 return register_qdisc(&atm_qdisc_ops);
682 }
683
684 static void __exit atm_exit(void)
685 {
686 unregister_qdisc(&atm_qdisc_ops);
687 }
688
689 module_init(atm_init)
690 module_exit(atm_exit)
691 MODULE_LICENSE("GPL");
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