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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/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 /*
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_packed bstats;
53  struct gnet_stats_queue qstats;
54  struct list_head list;
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 list_head 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 inline struct atm_flow_data *lookup_flow(struct Qdisc *sch, u32 classid)
71 {
72  struct atm_qdisc_data *p = qdisc_priv(sch);
73  struct atm_flow_data *flow;
74 
75  list_for_each_entry(flow, &p->flows, list) {
76  if (flow->classid == classid)
77  return flow;
78  }
79  return NULL;
80 }
81 
82 static int atm_tc_graft(struct Qdisc *sch, unsigned long arg,
83  struct Qdisc *new, struct Qdisc **old)
84 {
85  struct atm_qdisc_data *p = qdisc_priv(sch);
86  struct atm_flow_data *flow = (struct atm_flow_data *)arg;
87 
88  pr_debug("atm_tc_graft(sch %p,[qdisc %p],flow %p,new %p,old %p)\n",
89  sch, p, flow, new, old);
90  if (list_empty(&flow->list))
91  return -EINVAL;
92  if (!new)
93  new = &noop_qdisc;
94  *old = flow->q;
95  flow->q = new;
96  if (*old)
97  qdisc_reset(*old);
98  return 0;
99 }
100 
101 static struct Qdisc *atm_tc_leaf(struct Qdisc *sch, unsigned long cl)
102 {
103  struct atm_flow_data *flow = (struct atm_flow_data *)cl;
104 
105  pr_debug("atm_tc_leaf(sch %p,flow %p)\n", sch, flow);
106  return flow ? flow->q : NULL;
107 }
108 
109 static unsigned long atm_tc_get(struct Qdisc *sch, u32 classid)
110 {
111  struct atm_qdisc_data *p __maybe_unused = qdisc_priv(sch);
112  struct atm_flow_data *flow;
113 
114  pr_debug("atm_tc_get(sch %p,[qdisc %p],classid %x)\n", sch, p, classid);
115  flow = lookup_flow(sch, classid);
116  if (flow)
117  flow->ref++;
118  pr_debug("atm_tc_get: flow %p\n", flow);
119  return (unsigned long)flow;
120 }
121 
122 static unsigned long atm_tc_bind_filter(struct Qdisc *sch,
123  unsigned long parent, u32 classid)
124 {
125  return atm_tc_get(sch, classid);
126 }
127 
128 /*
129  * atm_tc_put handles all destructions, including the ones that are explicitly
130  * requested (atm_tc_destroy, etc.). The assumption here is that we never drop
131  * anything that still seems to be in use.
132  */
133 static void atm_tc_put(struct Qdisc *sch, unsigned long cl)
134 {
135  struct atm_qdisc_data *p = qdisc_priv(sch);
136  struct atm_flow_data *flow = (struct atm_flow_data *)cl;
137 
138  pr_debug("atm_tc_put(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
139  if (--flow->ref)
140  return;
141  pr_debug("atm_tc_put: destroying\n");
142  list_del_init(&flow->list);
143  pr_debug("atm_tc_put: qdisc %p\n", flow->q);
144  qdisc_destroy(flow->q);
145  tcf_destroy_chain(&flow->filter_list);
146  if (flow->sock) {
147  pr_debug("atm_tc_put: f_count %ld\n",
148  file_count(flow->sock->file));
149  flow->vcc->pop = flow->old_pop;
150  sockfd_put(flow->sock);
151  }
152  if (flow->excess)
153  atm_tc_put(sch, (unsigned long)flow->excess);
154  if (flow != &p->link)
155  kfree(flow);
156  /*
157  * If flow == &p->link, the qdisc no longer works at this point and
158  * needs to be removed. (By the caller of atm_tc_put.)
159  */
160 }
161 
162 static void sch_atm_pop(struct atm_vcc *vcc, struct sk_buff *skb)
163 {
164  struct atm_qdisc_data *p = VCC2FLOW(vcc)->parent;
165 
166  pr_debug("sch_atm_pop(vcc %p,skb %p,[qdisc %p])\n", vcc, skb, p);
167  VCC2FLOW(vcc)->old_pop(vcc, skb);
168  tasklet_schedule(&p->task);
169 }
170 
171 static const u8 llc_oui_ip[] = {
172  0xaa, /* DSAP: non-ISO */
173  0xaa, /* SSAP: non-ISO */
174  0x03, /* Ctrl: Unnumbered Information Command PDU */
175  0x00, /* OUI: EtherType */
176  0x00, 0x00,
177  0x08, 0x00
178 }; /* Ethertype IP (0800) */
179 
180 static const struct nla_policy atm_policy[TCA_ATM_MAX + 1] = {
181  [TCA_ATM_FD] = { .type = NLA_U32 },
182  [TCA_ATM_EXCESS] = { .type = NLA_U32 },
183 };
184 
185 static int atm_tc_change(struct Qdisc *sch, u32 classid, u32 parent,
186  struct nlattr **tca, unsigned long *arg)
187 {
188  struct atm_qdisc_data *p = qdisc_priv(sch);
189  struct atm_flow_data *flow = (struct atm_flow_data *)*arg;
190  struct atm_flow_data *excess = NULL;
191  struct nlattr *opt = tca[TCA_OPTIONS];
192  struct nlattr *tb[TCA_ATM_MAX + 1];
193  struct socket *sock;
194  int fd, error, hdr_len;
195  void *hdr;
196 
197  pr_debug("atm_tc_change(sch %p,[qdisc %p],classid %x,parent %x,"
198  "flow %p,opt %p)\n", sch, p, classid, parent, flow, opt);
199  /*
200  * The concept of parents doesn't apply for this qdisc.
201  */
202  if (parent && parent != TC_H_ROOT && parent != sch->handle)
203  return -EINVAL;
204  /*
205  * ATM classes cannot be changed. In order to change properties of the
206  * ATM connection, that socket needs to be modified directly (via the
207  * native ATM API. In order to send a flow to a different VC, the old
208  * class needs to be removed and a new one added. (This may be changed
209  * later.)
210  */
211  if (flow)
212  return -EBUSY;
213  if (opt == NULL)
214  return -EINVAL;
215 
216  error = nla_parse_nested(tb, TCA_ATM_MAX, opt, atm_policy);
217  if (error < 0)
218  return error;
219 
220  if (!tb[TCA_ATM_FD])
221  return -EINVAL;
222  fd = nla_get_u32(tb[TCA_ATM_FD]);
223  pr_debug("atm_tc_change: fd %d\n", fd);
224  if (tb[TCA_ATM_HDR]) {
225  hdr_len = nla_len(tb[TCA_ATM_HDR]);
226  hdr = nla_data(tb[TCA_ATM_HDR]);
227  } else {
228  hdr_len = RFC1483LLC_LEN;
229  hdr = NULL; /* default LLC/SNAP for IP */
230  }
231  if (!tb[TCA_ATM_EXCESS])
232  excess = NULL;
233  else {
234  excess = (struct atm_flow_data *)
235  atm_tc_get(sch, nla_get_u32(tb[TCA_ATM_EXCESS]));
236  if (!excess)
237  return -ENOENT;
238  }
239  pr_debug("atm_tc_change: type %d, payload %d, hdr_len %d\n",
240  opt->nla_type, nla_len(opt), hdr_len);
241  sock = sockfd_lookup(fd, &error);
242  if (!sock)
243  return error; /* f_count++ */
244  pr_debug("atm_tc_change: f_count %ld\n", file_count(sock->file));
245  if (sock->ops->family != PF_ATMSVC && sock->ops->family != PF_ATMPVC) {
246  error = -EPROTOTYPE;
247  goto err_out;
248  }
249  /* @@@ should check if the socket is really operational or we'll crash
250  on vcc->send */
251  if (classid) {
252  if (TC_H_MAJ(classid ^ sch->handle)) {
253  pr_debug("atm_tc_change: classid mismatch\n");
254  error = -EINVAL;
255  goto err_out;
256  }
257  } else {
258  int i;
259  unsigned long cl;
260 
261  for (i = 1; i < 0x8000; i++) {
262  classid = TC_H_MAKE(sch->handle, 0x8000 | i);
263  cl = atm_tc_get(sch, classid);
264  if (!cl)
265  break;
266  atm_tc_put(sch, cl);
267  }
268  }
269  pr_debug("atm_tc_change: new id %x\n", classid);
270  flow = kzalloc(sizeof(struct atm_flow_data) + hdr_len, GFP_KERNEL);
271  pr_debug("atm_tc_change: flow %p\n", flow);
272  if (!flow) {
273  error = -ENOBUFS;
274  goto err_out;
275  }
276  flow->filter_list = NULL;
277  flow->q = qdisc_create_dflt(sch->dev_queue, &pfifo_qdisc_ops, classid);
278  if (!flow->q)
279  flow->q = &noop_qdisc;
280  pr_debug("atm_tc_change: qdisc %p\n", flow->q);
281  flow->sock = sock;
282  flow->vcc = ATM_SD(sock); /* speedup */
283  flow->vcc->user_back = flow;
284  pr_debug("atm_tc_change: vcc %p\n", flow->vcc);
285  flow->old_pop = flow->vcc->pop;
286  flow->parent = p;
287  flow->vcc->pop = sch_atm_pop;
288  flow->classid = classid;
289  flow->ref = 1;
290  flow->excess = excess;
291  list_add(&flow->list, &p->link.list);
292  flow->hdr_len = hdr_len;
293  if (hdr)
294  memcpy(flow->hdr, hdr, hdr_len);
295  else
296  memcpy(flow->hdr, llc_oui_ip, sizeof(llc_oui_ip));
297  *arg = (unsigned long)flow;
298  return 0;
299 err_out:
300  if (excess)
301  atm_tc_put(sch, (unsigned long)excess);
302  sockfd_put(sock);
303  return error;
304 }
305 
306 static int atm_tc_delete(struct Qdisc *sch, unsigned long arg)
307 {
308  struct atm_qdisc_data *p = qdisc_priv(sch);
309  struct atm_flow_data *flow = (struct atm_flow_data *)arg;
310 
311  pr_debug("atm_tc_delete(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
312  if (list_empty(&flow->list))
313  return -EINVAL;
314  if (flow->filter_list || flow == &p->link)
315  return -EBUSY;
316  /*
317  * Reference count must be 2: one for "keepalive" (set at class
318  * creation), and one for the reference held when calling delete.
319  */
320  if (flow->ref < 2) {
321  pr_err("atm_tc_delete: flow->ref == %d\n", flow->ref);
322  return -EINVAL;
323  }
324  if (flow->ref > 2)
325  return -EBUSY; /* catch references via excess, etc. */
326  atm_tc_put(sch, arg);
327  return 0;
328 }
329 
330 static void atm_tc_walk(struct Qdisc *sch, struct qdisc_walker *walker)
331 {
332  struct atm_qdisc_data *p = qdisc_priv(sch);
333  struct atm_flow_data *flow;
334 
335  pr_debug("atm_tc_walk(sch %p,[qdisc %p],walker %p)\n", sch, p, walker);
336  if (walker->stop)
337  return;
338  list_for_each_entry(flow, &p->flows, list) {
339  if (walker->count >= walker->skip &&
340  walker->fn(sch, (unsigned long)flow, walker) < 0) {
341  walker->stop = 1;
342  break;
343  }
344  walker->count++;
345  }
346 }
347 
348 static struct tcf_proto **atm_tc_find_tcf(struct Qdisc *sch, unsigned long cl)
349 {
350  struct atm_qdisc_data *p = qdisc_priv(sch);
351  struct atm_flow_data *flow = (struct atm_flow_data *)cl;
352 
353  pr_debug("atm_tc_find_tcf(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
354  return flow ? &flow->filter_list : &p->link.filter_list;
355 }
356 
357 /* --------------------------- Qdisc operations ---------------------------- */
358 
359 static int atm_tc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
360 {
361  struct atm_qdisc_data *p = qdisc_priv(sch);
362  struct atm_flow_data *flow;
363  struct tcf_result res;
364  int result;
365  int ret = NET_XMIT_POLICED;
366 
367  pr_debug("atm_tc_enqueue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p);
368  result = TC_POLICE_OK; /* be nice to gcc */
369  flow = NULL;
370  if (TC_H_MAJ(skb->priority) != sch->handle ||
371  !(flow = (struct atm_flow_data *)atm_tc_get(sch, skb->priority))) {
372  list_for_each_entry(flow, &p->flows, list) {
373  if (flow->filter_list) {
374  result = tc_classify_compat(skb,
375  flow->filter_list,
376  &res);
377  if (result < 0)
378  continue;
379  flow = (struct atm_flow_data *)res.class;
380  if (!flow)
381  flow = lookup_flow(sch, res.classid);
382  goto done;
383  }
384  }
385  flow = NULL;
386 done:
387  ;
388  }
389  if (!flow) {
390  flow = &p->link;
391  } else {
392  if (flow->vcc)
393  ATM_SKB(skb)->atm_options = flow->vcc->atm_options;
394  /*@@@ looks good ... but it's not supposed to work :-) */
395 #ifdef CONFIG_NET_CLS_ACT
396  switch (result) {
397  case TC_ACT_QUEUED:
398  case TC_ACT_STOLEN:
399  kfree_skb(skb);
400  return NET_XMIT_SUCCESS | __NET_XMIT_STOLEN;
401  case TC_ACT_SHOT:
402  kfree_skb(skb);
403  goto drop;
404  case TC_POLICE_RECLASSIFY:
405  if (flow->excess)
406  flow = flow->excess;
407  else
408  ATM_SKB(skb)->atm_options |= ATM_ATMOPT_CLP;
409  break;
410  }
411 #endif
412  }
413 
414  ret = qdisc_enqueue(skb, flow->q);
415  if (ret != NET_XMIT_SUCCESS) {
416 drop: __maybe_unused
417  if (net_xmit_drop_count(ret)) {
418  sch->qstats.drops++;
419  if (flow)
420  flow->qstats.drops++;
421  }
422  return ret;
423  }
424  /*
425  * Okay, this may seem weird. We pretend we've dropped the packet if
426  * it goes via ATM. The reason for this is that the outer qdisc
427  * expects to be able to q->dequeue the packet later on if we return
428  * success at this place. Also, sch->q.qdisc needs to reflect whether
429  * there is a packet egligible for dequeuing or not. Note that the
430  * statistics of the outer qdisc are necessarily wrong because of all
431  * this. There's currently no correct solution for this.
432  */
433  if (flow == &p->link) {
434  sch->q.qlen++;
435  return NET_XMIT_SUCCESS;
436  }
437  tasklet_schedule(&p->task);
438  return NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
439 }
440 
441 /*
442  * Dequeue packets and send them over ATM. Note that we quite deliberately
443  * avoid checking net_device's flow control here, simply because sch_atm
444  * uses its own channels, which have nothing to do with any CLIP/LANE/or
445  * non-ATM interfaces.
446  */
447 
448 static void sch_atm_dequeue(unsigned long data)
449 {
450  struct Qdisc *sch = (struct Qdisc *)data;
451  struct atm_qdisc_data *p = qdisc_priv(sch);
452  struct atm_flow_data *flow;
453  struct sk_buff *skb;
454 
455  pr_debug("sch_atm_dequeue(sch %p,[qdisc %p])\n", sch, p);
456  list_for_each_entry(flow, &p->flows, list) {
457  if (flow == &p->link)
458  continue;
459  /*
460  * If traffic is properly shaped, this won't generate nasty
461  * little bursts. Otherwise, it may ... (but that's okay)
462  */
463  while ((skb = flow->q->ops->peek(flow->q))) {
464  if (!atm_may_send(flow->vcc, skb->truesize))
465  break;
466 
467  skb = qdisc_dequeue_peeked(flow->q);
468  if (unlikely(!skb))
469  break;
470 
471  qdisc_bstats_update(sch, skb);
472  bstats_update(&flow->bstats, skb);
473  pr_debug("atm_tc_dequeue: sending on class %p\n", flow);
474  /* remove any LL header somebody else has attached */
475  skb_pull(skb, skb_network_offset(skb));
476  if (skb_headroom(skb) < flow->hdr_len) {
477  struct sk_buff *new;
478 
479  new = skb_realloc_headroom(skb, flow->hdr_len);
480  dev_kfree_skb(skb);
481  if (!new)
482  continue;
483  skb = new;
484  }
485  pr_debug("sch_atm_dequeue: ip %p, data %p\n",
486  skb_network_header(skb), skb->data);
487  ATM_SKB(skb)->vcc = flow->vcc;
488  memcpy(skb_push(skb, flow->hdr_len), flow->hdr,
489  flow->hdr_len);
490  atomic_add(skb->truesize,
491  &sk_atm(flow->vcc)->sk_wmem_alloc);
492  /* atm.atm_options are already set by atm_tc_enqueue */
493  flow->vcc->send(flow->vcc, skb);
494  }
495  }
496 }
497 
498 static struct sk_buff *atm_tc_dequeue(struct Qdisc *sch)
499 {
500  struct atm_qdisc_data *p = qdisc_priv(sch);
501  struct sk_buff *skb;
502 
503  pr_debug("atm_tc_dequeue(sch %p,[qdisc %p])\n", sch, p);
504  tasklet_schedule(&p->task);
505  skb = qdisc_dequeue_peeked(p->link.q);
506  if (skb)
507  sch->q.qlen--;
508  return skb;
509 }
510 
511 static struct sk_buff *atm_tc_peek(struct Qdisc *sch)
512 {
513  struct atm_qdisc_data *p = qdisc_priv(sch);
514 
515  pr_debug("atm_tc_peek(sch %p,[qdisc %p])\n", sch, p);
516 
517  return p->link.q->ops->peek(p->link.q);
518 }
519 
520 static unsigned int atm_tc_drop(struct Qdisc *sch)
521 {
522  struct atm_qdisc_data *p = qdisc_priv(sch);
523  struct atm_flow_data *flow;
524  unsigned int len;
525 
526  pr_debug("atm_tc_drop(sch %p,[qdisc %p])\n", sch, p);
527  list_for_each_entry(flow, &p->flows, list) {
528  if (flow->q->ops->drop && (len = flow->q->ops->drop(flow->q)))
529  return len;
530  }
531  return 0;
532 }
533 
534 static int atm_tc_init(struct Qdisc *sch, struct nlattr *opt)
535 {
536  struct atm_qdisc_data *p = qdisc_priv(sch);
537 
538  pr_debug("atm_tc_init(sch %p,[qdisc %p],opt %p)\n", sch, p, opt);
539  INIT_LIST_HEAD(&p->flows);
540  INIT_LIST_HEAD(&p->link.list);
541  list_add(&p->link.list, &p->flows);
542  p->link.q = qdisc_create_dflt(sch->dev_queue,
543  &pfifo_qdisc_ops, sch->handle);
544  if (!p->link.q)
545  p->link.q = &noop_qdisc;
546  pr_debug("atm_tc_init: link (%p) qdisc %p\n", &p->link, p->link.q);
547  p->link.filter_list = NULL;
548  p->link.vcc = NULL;
549  p->link.sock = NULL;
550  p->link.classid = sch->handle;
551  p->link.ref = 1;
552  tasklet_init(&p->task, sch_atm_dequeue, (unsigned long)sch);
553  return 0;
554 }
555 
556 static void atm_tc_reset(struct Qdisc *sch)
557 {
558  struct atm_qdisc_data *p = qdisc_priv(sch);
559  struct atm_flow_data *flow;
560 
561  pr_debug("atm_tc_reset(sch %p,[qdisc %p])\n", sch, p);
562  list_for_each_entry(flow, &p->flows, list)
563  qdisc_reset(flow->q);
564  sch->q.qlen = 0;
565 }
566 
567 static void atm_tc_destroy(struct Qdisc *sch)
568 {
569  struct atm_qdisc_data *p = qdisc_priv(sch);
570  struct atm_flow_data *flow, *tmp;
571 
572  pr_debug("atm_tc_destroy(sch %p,[qdisc %p])\n", sch, p);
573  list_for_each_entry(flow, &p->flows, list)
574  tcf_destroy_chain(&flow->filter_list);
575 
576  list_for_each_entry_safe(flow, tmp, &p->flows, list) {
577  if (flow->ref > 1)
578  pr_err("atm_destroy: %p->ref = %d\n", flow, flow->ref);
579  atm_tc_put(sch, (unsigned long)flow);
580  }
581  tasklet_kill(&p->task);
582 }
583 
584 static int atm_tc_dump_class(struct Qdisc *sch, unsigned long cl,
585  struct sk_buff *skb, struct tcmsg *tcm)
586 {
587  struct atm_qdisc_data *p = qdisc_priv(sch);
588  struct atm_flow_data *flow = (struct atm_flow_data *)cl;
589  struct nlattr *nest;
590 
591  pr_debug("atm_tc_dump_class(sch %p,[qdisc %p],flow %p,skb %p,tcm %p)\n",
592  sch, p, flow, skb, tcm);
593  if (list_empty(&flow->list))
594  return -EINVAL;
595  tcm->tcm_handle = flow->classid;
596  tcm->tcm_info = flow->q->handle;
597 
598  nest = nla_nest_start(skb, TCA_OPTIONS);
599  if (nest == NULL)
600  goto nla_put_failure;
601 
602  if (nla_put(skb, TCA_ATM_HDR, flow->hdr_len, flow->hdr))
603  goto nla_put_failure;
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  if (nla_put(skb, TCA_ATM_ADDR, sizeof(pvc), &pvc))
613  goto nla_put_failure;
614  state = ATM_VF2VS(flow->vcc->flags);
615  if (nla_put_u32(skb, TCA_ATM_STATE, state))
616  goto nla_put_failure;
617  }
618  if (flow->excess) {
619  if (nla_put_u32(skb, TCA_ATM_EXCESS, flow->classid))
620  goto nla_put_failure;
621  } else {
622  if (nla_put_u32(skb, TCA_ATM_EXCESS, 0))
623  goto nla_put_failure;
624  }
625  nla_nest_end(skb, nest);
626  return skb->len;
627 
628 nla_put_failure:
629  nla_nest_cancel(skb, nest);
630  return -1;
631 }
632 static int
633 atm_tc_dump_class_stats(struct Qdisc *sch, unsigned long arg,
634  struct gnet_dump *d)
635 {
636  struct atm_flow_data *flow = (struct atm_flow_data *)arg;
637 
638  flow->qstats.qlen = flow->q->q.qlen;
639 
640  if (gnet_stats_copy_basic(d, &flow->bstats) < 0 ||
641  gnet_stats_copy_queue(d, &flow->qstats) < 0)
642  return -1;
643 
644  return 0;
645 }
646 
647 static int atm_tc_dump(struct Qdisc *sch, struct sk_buff *skb)
648 {
649  return 0;
650 }
651 
652 static const struct Qdisc_class_ops atm_class_ops = {
653  .graft = atm_tc_graft,
654  .leaf = atm_tc_leaf,
655  .get = atm_tc_get,
656  .put = atm_tc_put,
657  .change = atm_tc_change,
658  .delete = atm_tc_delete,
659  .walk = atm_tc_walk,
660  .tcf_chain = atm_tc_find_tcf,
661  .bind_tcf = atm_tc_bind_filter,
662  .unbind_tcf = atm_tc_put,
663  .dump = atm_tc_dump_class,
664  .dump_stats = atm_tc_dump_class_stats,
665 };
666 
667 static struct Qdisc_ops atm_qdisc_ops __read_mostly = {
668  .cl_ops = &atm_class_ops,
669  .id = "atm",
670  .priv_size = sizeof(struct atm_qdisc_data),
671  .enqueue = atm_tc_enqueue,
672  .dequeue = atm_tc_dequeue,
673  .peek = atm_tc_peek,
674  .drop = atm_tc_drop,
675  .init = atm_tc_init,
676  .reset = atm_tc_reset,
677  .destroy = atm_tc_destroy,
678  .dump = atm_tc_dump,
679  .owner = THIS_MODULE,
680 };
681 
682 static int __init atm_init(void)
683 {
684  return register_qdisc(&atm_qdisc_ops);
685 }
686 
687 static void __exit atm_exit(void)
688 {
689  unregister_qdisc(&atm_qdisc_ops);
690 }
691 
692 module_init(atm_init)
693 module_exit(atm_exit)
694 MODULE_LICENSE("GPL");
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