net_sched: factorize qdisc stats handling
[linux-2.6.git] / net / sched / sch_atm.c
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                 printk(KERN_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                         printk(KERN_ERR "atm_destroy: %p->ref = %d\n", flow,
580                                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
623         nla_nest_end(skb, nest);
624         return skb->len;
625
626 nla_put_failure:
627         nla_nest_cancel(skb, nest);
628         return -1;
629 }
630 static int
631 atm_tc_dump_class_stats(struct Qdisc *sch, unsigned long arg,
632                         struct gnet_dump *d)
633 {
634         struct atm_flow_data *flow = (struct atm_flow_data *)arg;
635
636         flow->qstats.qlen = flow->q->q.qlen;
637
638         if (gnet_stats_copy_basic(d, &flow->bstats) < 0 ||
639             gnet_stats_copy_queue(d, &flow->qstats) < 0)
640                 return -1;
641
642         return 0;
643 }
644
645 static int atm_tc_dump(struct Qdisc *sch, struct sk_buff *skb)
646 {
647         return 0;
648 }
649
650 static const struct Qdisc_class_ops atm_class_ops = {
651         .graft          = atm_tc_graft,
652         .leaf           = atm_tc_leaf,
653         .get            = atm_tc_get,
654         .put            = atm_tc_put,
655         .change         = atm_tc_change,
656         .delete         = atm_tc_delete,
657         .walk           = atm_tc_walk,
658         .tcf_chain      = atm_tc_find_tcf,
659         .bind_tcf       = atm_tc_bind_filter,
660         .unbind_tcf     = atm_tc_put,
661         .dump           = atm_tc_dump_class,
662         .dump_stats     = atm_tc_dump_class_stats,
663 };
664
665 static struct Qdisc_ops atm_qdisc_ops __read_mostly = {
666         .cl_ops         = &atm_class_ops,
667         .id             = "atm",
668         .priv_size      = sizeof(struct atm_qdisc_data),
669         .enqueue        = atm_tc_enqueue,
670         .dequeue        = atm_tc_dequeue,
671         .peek           = atm_tc_peek,
672         .drop           = atm_tc_drop,
673         .init           = atm_tc_init,
674         .reset          = atm_tc_reset,
675         .destroy        = atm_tc_destroy,
676         .dump           = atm_tc_dump,
677         .owner          = THIS_MODULE,
678 };
679
680 static int __init atm_init(void)
681 {
682         return register_qdisc(&atm_qdisc_ops);
683 }
684
685 static void __exit atm_exit(void)
686 {
687         unregister_qdisc(&atm_qdisc_ops);
688 }
689
690 module_init(atm_init)
691 module_exit(atm_exit)
692 MODULE_LICENSE("GPL");