baca8743c12ba78a70dc2f08b9acc8cfd33babea
[linux-3.10.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
6 #include <linux/module.h>
7 #include <linux/init.h>
8 #include <linux/string.h>
9 #include <linux/errno.h>
10 #include <linux/skbuff.h>
11 #include <linux/interrupt.h>
12 #include <linux/atmdev.h>
13 #include <linux/atmclip.h>
14 #include <linux/netdevice.h>
15 #include <linux/rtnetlink.h>
16 #include <linux/file.h> /* for fput */
17 #include <net/pkt_sched.h>
18 #include <net/sock.h>
19
20
21 extern struct socket *sockfd_lookup(int fd, int *err); /* @@@ fix this */
22
23 #if 0 /* control */
24 #define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
25 #else
26 #define DPRINTK(format,args...)
27 #endif
28
29 #if 0 /* data */
30 #define D2PRINTK(format,args...) printk(KERN_DEBUG format,##args)
31 #else
32 #define D2PRINTK(format,args...)
33 #endif
34
35
36 /*
37  * The ATM queuing discipline provides a framework for invoking classifiers
38  * (aka "filters"), which in turn select classes of this queuing discipline.
39  * Each class maps the flow(s) it is handling to a given VC. Multiple classes
40  * may share the same VC.
41  *
42  * When creating a class, VCs are specified by passing the number of the open
43  * socket descriptor by which the calling process references the VC. The kernel
44  * keeps the VC open at least until all classes using it are removed.
45  *
46  * In this file, most functions are named atm_tc_* to avoid confusion with all
47  * the atm_* in net/atm. This naming convention differs from what's used in the
48  * rest of net/sched.
49  *
50  * Known bugs:
51  *  - sometimes messes up the IP stack
52  *  - any manipulations besides the few operations described in the README, are
53  *    untested and likely to crash the system
54  *  - should lock the flow while there is data in the queue (?)
55  */
56
57
58 #define PRIV(sch) qdisc_priv(sch)
59 #define VCC2FLOW(vcc) ((struct atm_flow_data *) ((vcc)->user_back))
60
61
62 struct atm_flow_data {
63         struct Qdisc            *q;             /* FIFO, TBF, etc. */
64         struct tcf_proto        *filter_list;
65         struct atm_vcc          *vcc;           /* VCC; NULL if VCC is closed */
66         void (*old_pop)(struct atm_vcc *vcc,struct sk_buff *skb); /* chaining */
67         struct atm_qdisc_data   *parent;        /* parent qdisc */
68         struct socket           *sock;          /* for closing */
69         u32                     classid;        /* x:y type ID */
70         int                     ref;            /* reference count */
71         struct gnet_stats_basic bstats;
72         struct gnet_stats_queue qstats;
73         spinlock_t              *stats_lock;
74         struct atm_flow_data    *next;
75         struct atm_flow_data    *excess;        /* flow for excess traffic;
76                                                    NULL to set CLP instead */
77         int                     hdr_len;
78         unsigned char           hdr[0];         /* header data; MUST BE LAST */
79 };
80
81 struct atm_qdisc_data {
82         struct atm_flow_data    link;           /* unclassified skbs go here */
83         struct atm_flow_data    *flows;         /* NB: "link" is also on this
84                                                    list */
85         struct tasklet_struct   task;           /* requeue tasklet */
86 };
87
88
89 /* ------------------------- Class/flow operations ------------------------- */
90
91
92 static int find_flow(struct atm_qdisc_data *qdisc,struct atm_flow_data *flow)
93 {
94         struct atm_flow_data *walk;
95
96         DPRINTK("find_flow(qdisc %p,flow %p)\n",qdisc,flow);
97         for (walk = qdisc->flows; walk; walk = walk->next)
98                 if (walk == flow) return 1;
99         DPRINTK("find_flow: not found\n");
100         return 0;
101 }
102
103
104 static __inline__ struct atm_flow_data *lookup_flow(struct Qdisc *sch,
105     u32 classid)
106 {
107         struct atm_qdisc_data *p = PRIV(sch);
108         struct atm_flow_data *flow;
109
110         for (flow = p->flows; flow; flow = flow->next)
111                 if (flow->classid == classid) break;
112         return flow;
113 }
114
115
116 static int atm_tc_graft(struct Qdisc *sch,unsigned long arg,
117     struct Qdisc *new,struct Qdisc **old)
118 {
119         struct atm_qdisc_data *p = PRIV(sch);
120         struct atm_flow_data *flow = (struct atm_flow_data *) arg;
121
122         DPRINTK("atm_tc_graft(sch %p,[qdisc %p],flow %p,new %p,old %p)\n",sch,
123             p,flow,new,old);
124         if (!find_flow(p,flow)) return -EINVAL;
125         if (!new) new = &noop_qdisc;
126         *old = xchg(&flow->q,new);
127         if (*old) qdisc_reset(*old);
128         return 0;
129 }
130
131
132 static struct Qdisc *atm_tc_leaf(struct Qdisc *sch,unsigned long cl)
133 {
134         struct atm_flow_data *flow = (struct atm_flow_data *) cl;
135
136         DPRINTK("atm_tc_leaf(sch %p,flow %p)\n",sch,flow);
137         return flow ? flow->q : NULL;
138 }
139
140
141 static unsigned long atm_tc_get(struct Qdisc *sch,u32 classid)
142 {
143         struct atm_qdisc_data *p __attribute__((unused)) = PRIV(sch);
144         struct atm_flow_data *flow;
145
146         DPRINTK("atm_tc_get(sch %p,[qdisc %p],classid %x)\n",sch,p,classid);
147         flow = lookup_flow(sch,classid);
148         if (flow) flow->ref++;
149         DPRINTK("atm_tc_get: flow %p\n",flow);
150         return (unsigned long) flow;
151 }
152
153
154 static unsigned long atm_tc_bind_filter(struct Qdisc *sch,
155     unsigned long parent, u32 classid)
156 {
157         return atm_tc_get(sch,classid);
158 }
159
160
161 static void destroy_filters(struct atm_flow_data *flow)
162 {
163         struct tcf_proto *filter;
164
165         while ((filter = flow->filter_list)) {
166                 DPRINTK("destroy_filters: destroying filter %p\n",filter);
167                 flow->filter_list = filter->next;
168                 tcf_destroy(filter);
169         }
170 }
171
172
173 /*
174  * atm_tc_put handles all destructions, including the ones that are explicitly
175  * requested (atm_tc_destroy, etc.). The assumption here is that we never drop
176  * anything that still seems to be in use.
177  */
178
179 static void atm_tc_put(struct Qdisc *sch, unsigned long cl)
180 {
181         struct atm_qdisc_data *p = PRIV(sch);
182         struct atm_flow_data *flow = (struct atm_flow_data *) cl;
183         struct atm_flow_data **prev;
184
185         DPRINTK("atm_tc_put(sch %p,[qdisc %p],flow %p)\n",sch,p,flow);
186         if (--flow->ref) return;
187         DPRINTK("atm_tc_put: destroying\n");
188         for (prev = &p->flows; *prev; prev = &(*prev)->next)
189                 if (*prev == flow) break;
190         if (!*prev) {
191                 printk(KERN_CRIT "atm_tc_put: class %p not found\n",flow);
192                 return;
193         }
194         *prev = flow->next;
195         DPRINTK("atm_tc_put: qdisc %p\n",flow->q);
196         qdisc_destroy(flow->q);
197         destroy_filters(flow);
198         if (flow->sock) {
199                 DPRINTK("atm_tc_put: f_count %d\n",
200                     file_count(flow->sock->file));
201                 flow->vcc->pop = flow->old_pop;
202                 sockfd_put(flow->sock);
203         }
204         if (flow->excess) atm_tc_put(sch,(unsigned long) flow->excess);
205         if (flow != &p->link) kfree(flow);
206         /*
207          * If flow == &p->link, the qdisc no longer works at this point and
208          * needs to be removed. (By the caller of atm_tc_put.)
209          */
210 }
211
212
213 static void sch_atm_pop(struct atm_vcc *vcc,struct sk_buff *skb)
214 {
215         struct atm_qdisc_data *p = VCC2FLOW(vcc)->parent;
216
217         D2PRINTK("sch_atm_pop(vcc %p,skb %p,[qdisc %p])\n",vcc,skb,p);
218         VCC2FLOW(vcc)->old_pop(vcc,skb);
219         tasklet_schedule(&p->task);
220 }
221
222 static const u8 llc_oui_ip[] = {
223         0xaa,           /* DSAP: non-ISO */
224         0xaa,           /* SSAP: non-ISO */
225         0x03,           /* Ctrl: Unnumbered Information Command PDU */
226         0x00,           /* OUI: EtherType */
227         0x00, 0x00,
228         0x08, 0x00 };   /* Ethertype IP (0800) */
229
230 static int atm_tc_change(struct Qdisc *sch, u32 classid, u32 parent,
231     struct rtattr **tca, unsigned long *arg)
232 {
233         struct atm_qdisc_data *p = PRIV(sch);
234         struct atm_flow_data *flow = (struct atm_flow_data *) *arg;
235         struct atm_flow_data *excess = NULL;
236         struct rtattr *opt = tca[TCA_OPTIONS-1];
237         struct rtattr *tb[TCA_ATM_MAX];
238         struct socket *sock;
239         int fd,error,hdr_len;
240         void *hdr;
241
242         DPRINTK("atm_tc_change(sch %p,[qdisc %p],classid %x,parent %x,"
243             "flow %p,opt %p)\n",sch,p,classid,parent,flow,opt);
244         /*
245          * The concept of parents doesn't apply for this qdisc.
246          */
247         if (parent && parent != TC_H_ROOT && parent != sch->handle)
248                 return -EINVAL;
249         /*
250          * ATM classes cannot be changed. In order to change properties of the
251          * ATM connection, that socket needs to be modified directly (via the
252          * native ATM API. In order to send a flow to a different VC, the old
253          * class needs to be removed and a new one added. (This may be changed
254          * later.)
255          */
256         if (flow) return -EBUSY;
257         if (opt == NULL || rtattr_parse_nested(tb, TCA_ATM_MAX, opt))
258                 return -EINVAL;
259         if (!tb[TCA_ATM_FD-1] || RTA_PAYLOAD(tb[TCA_ATM_FD-1]) < sizeof(fd))
260                 return -EINVAL;
261         fd = *(int *) RTA_DATA(tb[TCA_ATM_FD-1]);
262         DPRINTK("atm_tc_change: fd %d\n",fd);
263         if (tb[TCA_ATM_HDR-1]) {
264                 hdr_len = RTA_PAYLOAD(tb[TCA_ATM_HDR-1]);
265                 hdr = RTA_DATA(tb[TCA_ATM_HDR-1]);
266         }
267         else {
268                 hdr_len = RFC1483LLC_LEN;
269                 hdr = NULL; /* default LLC/SNAP for IP */
270         }
271         if (!tb[TCA_ATM_EXCESS-1]) excess = NULL;
272         else {
273                 if (RTA_PAYLOAD(tb[TCA_ATM_EXCESS-1]) != sizeof(u32))
274                         return -EINVAL;
275                 excess = (struct atm_flow_data *) atm_tc_get(sch,
276                     *(u32 *) RTA_DATA(tb[TCA_ATM_EXCESS-1]));
277                 if (!excess) return -ENOENT;
278         }
279         DPRINTK("atm_tc_change: type %d, payload %d, hdr_len %d\n",
280             opt->rta_type,RTA_PAYLOAD(opt),hdr_len);
281         if (!(sock = sockfd_lookup(fd,&error))) return error; /* f_count++ */
282         DPRINTK("atm_tc_change: f_count %d\n",file_count(sock->file));
283         if (sock->ops->family != PF_ATMSVC && sock->ops->family != PF_ATMPVC) {
284                 error = -EPROTOTYPE;
285                 goto err_out;
286         }
287         /* @@@ should check if the socket is really operational or we'll crash
288            on vcc->send */
289         if (classid) {
290                 if (TC_H_MAJ(classid ^ sch->handle)) {
291                         DPRINTK("atm_tc_change: classid mismatch\n");
292                         error = -EINVAL;
293                         goto err_out;
294                 }
295                 if (find_flow(p,flow)) {
296                         error = -EEXIST;
297                         goto err_out;
298                 }
299         }
300         else {
301                 int i;
302                 unsigned long cl;
303
304                 for (i = 1; i < 0x8000; i++) {
305                         classid = TC_H_MAKE(sch->handle,0x8000 | i);
306                         if (!(cl = atm_tc_get(sch,classid))) break;
307                         atm_tc_put(sch,cl);
308                 }
309         }
310         DPRINTK("atm_tc_change: new id %x\n",classid);
311         flow = kmalloc(sizeof(struct atm_flow_data)+hdr_len,GFP_KERNEL);
312         DPRINTK("atm_tc_change: flow %p\n",flow);
313         if (!flow) {
314                 error = -ENOBUFS;
315                 goto err_out;
316         }
317         memset(flow,0,sizeof(*flow));
318         flow->filter_list = NULL;
319         if (!(flow->q = qdisc_create_dflt(sch->dev,&pfifo_qdisc_ops,classid)))
320                 flow->q = &noop_qdisc;
321         DPRINTK("atm_tc_change: qdisc %p\n",flow->q);
322         flow->sock = sock;
323         flow->vcc = ATM_SD(sock); /* speedup */
324         flow->vcc->user_back = flow;
325         DPRINTK("atm_tc_change: vcc %p\n",flow->vcc);
326         flow->old_pop = flow->vcc->pop;
327         flow->parent = p;
328         flow->vcc->pop = sch_atm_pop;
329         flow->classid = classid;
330         flow->ref = 1;
331         flow->excess = excess;
332         flow->next = p->link.next;
333         p->link.next = flow;
334         flow->hdr_len = hdr_len;
335         if (hdr)
336                 memcpy(flow->hdr,hdr,hdr_len);
337         else
338                 memcpy(flow->hdr,llc_oui_ip,sizeof(llc_oui_ip));
339         *arg = (unsigned long) flow;
340         return 0;
341 err_out:
342         if (excess) atm_tc_put(sch,(unsigned long) excess);
343         sockfd_put(sock);
344         return error;
345 }
346
347
348 static int atm_tc_delete(struct Qdisc *sch,unsigned long arg)
349 {
350         struct atm_qdisc_data *p = PRIV(sch);
351         struct atm_flow_data *flow = (struct atm_flow_data *) arg;
352
353         DPRINTK("atm_tc_delete(sch %p,[qdisc %p],flow %p)\n",sch,p,flow);
354         if (!find_flow(PRIV(sch),flow)) return -EINVAL;
355         if (flow->filter_list || flow == &p->link) return -EBUSY;
356         /*
357          * Reference count must be 2: one for "keepalive" (set at class
358          * creation), and one for the reference held when calling delete.
359          */
360         if (flow->ref < 2) {
361                 printk(KERN_ERR "atm_tc_delete: flow->ref == %d\n",flow->ref);
362                 return -EINVAL;
363         }
364         if (flow->ref > 2) return -EBUSY; /* catch references via excess, etc.*/
365         atm_tc_put(sch,arg);
366         return 0;
367 }
368
369
370 static void atm_tc_walk(struct Qdisc *sch,struct qdisc_walker *walker)
371 {
372         struct atm_qdisc_data *p = PRIV(sch);
373         struct atm_flow_data *flow;
374
375         DPRINTK("atm_tc_walk(sch %p,[qdisc %p],walker %p)\n",sch,p,walker);
376         if (walker->stop) return;
377         for (flow = p->flows; flow; flow = flow->next) {
378                 if (walker->count >= walker->skip)
379                         if (walker->fn(sch,(unsigned long) flow,walker) < 0) {
380                                 walker->stop = 1;
381                                 break;
382                         }
383                 walker->count++;
384         }
385 }
386
387
388 static struct tcf_proto **atm_tc_find_tcf(struct Qdisc *sch,unsigned long cl)
389 {
390         struct atm_qdisc_data *p = PRIV(sch);
391         struct atm_flow_data *flow = (struct atm_flow_data *) cl;
392
393         DPRINTK("atm_tc_find_tcf(sch %p,[qdisc %p],flow %p)\n",sch,p,flow);
394         return flow ? &flow->filter_list : &p->link.filter_list;
395 }
396
397
398 /* --------------------------- Qdisc operations ---------------------------- */
399
400
401 static int atm_tc_enqueue(struct sk_buff *skb,struct Qdisc *sch)
402 {
403         struct atm_qdisc_data *p = PRIV(sch);
404         struct atm_flow_data *flow = NULL ; /* @@@ */
405         struct tcf_result res;
406         int result;
407         int ret = NET_XMIT_POLICED;
408
409         D2PRINTK("atm_tc_enqueue(skb %p,sch %p,[qdisc %p])\n",skb,sch,p);
410         result = TC_POLICE_OK; /* be nice to gcc */
411         if (TC_H_MAJ(skb->priority) != sch->handle ||
412             !(flow = (struct atm_flow_data *) atm_tc_get(sch,skb->priority)))
413                 for (flow = p->flows; flow; flow = flow->next)
414                         if (flow->filter_list) {
415                                 result = tc_classify(skb,flow->filter_list,
416                                     &res);
417                                 if (result < 0) continue;
418                                 flow = (struct atm_flow_data *) res.class;
419                                 if (!flow) flow = lookup_flow(sch,res.classid);
420                                 break;
421                         }
422         if (!flow) flow = &p->link;
423         else {
424                 if (flow->vcc)
425                         ATM_SKB(skb)->atm_options = flow->vcc->atm_options;
426                         /*@@@ looks good ... but it's not supposed to work :-)*/
427 #ifdef CONFIG_NET_CLS_POLICE
428                 switch (result) {
429                         case TC_POLICE_SHOT:
430                                 kfree_skb(skb);
431                                 break;
432                         case TC_POLICE_RECLASSIFY:
433                                 if (flow->excess) flow = flow->excess;
434                                 else {
435                                         ATM_SKB(skb)->atm_options |=
436                                             ATM_ATMOPT_CLP;
437                                         break;
438                                 }
439                                 /* fall through */
440                         case TC_POLICE_OK:
441                                 /* fall through */
442                         default:
443                                 break;
444                 }
445 #endif
446         }
447         if (
448 #ifdef CONFIG_NET_CLS_POLICE
449             result == TC_POLICE_SHOT ||
450 #endif
451             (ret = flow->q->enqueue(skb,flow->q)) != 0) {
452                 sch->qstats.drops++;
453                 if (flow) flow->qstats.drops++;
454                 return ret;
455         }
456         sch->bstats.bytes += skb->len;
457         sch->bstats.packets++;
458         flow->bstats.bytes += skb->len;
459         flow->bstats.packets++;
460         /*
461          * Okay, this may seem weird. We pretend we've dropped the packet if
462          * it goes via ATM. The reason for this is that the outer qdisc
463          * expects to be able to q->dequeue the packet later on if we return
464          * success at this place. Also, sch->q.qdisc needs to reflect whether
465          * there is a packet egligible for dequeuing or not. Note that the
466          * statistics of the outer qdisc are necessarily wrong because of all
467          * this. There's currently no correct solution for this.
468          */
469         if (flow == &p->link) {
470                 sch->q.qlen++;
471                 return 0;
472         }
473         tasklet_schedule(&p->task);
474         return NET_XMIT_BYPASS;
475 }
476
477
478 /*
479  * Dequeue packets and send them over ATM. Note that we quite deliberately
480  * avoid checking net_device's flow control here, simply because sch_atm
481  * uses its own channels, which have nothing to do with any CLIP/LANE/or
482  * non-ATM interfaces.
483  */
484
485
486 static void sch_atm_dequeue(unsigned long data)
487 {
488         struct Qdisc *sch = (struct Qdisc *) data;
489         struct atm_qdisc_data *p = PRIV(sch);
490         struct atm_flow_data *flow;
491         struct sk_buff *skb;
492
493         D2PRINTK("sch_atm_dequeue(sch %p,[qdisc %p])\n",sch,p);
494         for (flow = p->link.next; flow; flow = flow->next)
495                 /*
496                  * If traffic is properly shaped, this won't generate nasty
497                  * little bursts. Otherwise, it may ... (but that's okay)
498                  */
499                 while ((skb = flow->q->dequeue(flow->q))) {
500                         if (!atm_may_send(flow->vcc,skb->truesize)) {
501                                 (void) flow->q->ops->requeue(skb,flow->q);
502                                 break;
503                         }
504                         D2PRINTK("atm_tc_dequeue: sending on class %p\n",flow);
505                         /* remove any LL header somebody else has attached */
506                         skb_pull(skb, skb_network_offset(skb));
507                         if (skb_headroom(skb) < flow->hdr_len) {
508                                 struct sk_buff *new;
509
510                                 new = skb_realloc_headroom(skb,flow->hdr_len);
511                                 dev_kfree_skb(skb);
512                                 if (!new) continue;
513                                 skb = new;
514                         }
515                         D2PRINTK("sch_atm_dequeue: ip %p, data %p\n",
516                                  skb_network_header(skb), skb->data);
517                         ATM_SKB(skb)->vcc = flow->vcc;
518                         memcpy(skb_push(skb,flow->hdr_len),flow->hdr,
519                             flow->hdr_len);
520                         atomic_add(skb->truesize,
521                                    &sk_atm(flow->vcc)->sk_wmem_alloc);
522                         /* atm.atm_options are already set by atm_tc_enqueue */
523                         (void) flow->vcc->send(flow->vcc,skb);
524                 }
525 }
526
527
528 static struct sk_buff *atm_tc_dequeue(struct Qdisc *sch)
529 {
530         struct atm_qdisc_data *p = PRIV(sch);
531         struct sk_buff *skb;
532
533         D2PRINTK("atm_tc_dequeue(sch %p,[qdisc %p])\n",sch,p);
534         tasklet_schedule(&p->task);
535         skb = p->link.q->dequeue(p->link.q);
536         if (skb) sch->q.qlen--;
537         return skb;
538 }
539
540
541 static int atm_tc_requeue(struct sk_buff *skb,struct Qdisc *sch)
542 {
543         struct atm_qdisc_data *p = PRIV(sch);
544         int ret;
545
546         D2PRINTK("atm_tc_requeue(skb %p,sch %p,[qdisc %p])\n",skb,sch,p);
547         ret = p->link.q->ops->requeue(skb,p->link.q);
548         if (!ret) {
549         sch->q.qlen++;
550         sch->qstats.requeues++;
551     } else {
552                 sch->qstats.drops++;
553                 p->link.qstats.drops++;
554         }
555         return ret;
556 }
557
558
559 static unsigned int atm_tc_drop(struct Qdisc *sch)
560 {
561         struct atm_qdisc_data *p = PRIV(sch);
562         struct atm_flow_data *flow;
563         unsigned int len;
564
565         DPRINTK("atm_tc_drop(sch %p,[qdisc %p])\n",sch,p);
566         for (flow = p->flows; flow; flow = flow->next)
567                 if (flow->q->ops->drop && (len = flow->q->ops->drop(flow->q)))
568                         return len;
569         return 0;
570 }
571
572
573 static int atm_tc_init(struct Qdisc *sch,struct rtattr *opt)
574 {
575         struct atm_qdisc_data *p = PRIV(sch);
576
577         DPRINTK("atm_tc_init(sch %p,[qdisc %p],opt %p)\n",sch,p,opt);
578         p->flows = &p->link;
579         if(!(p->link.q = qdisc_create_dflt(sch->dev,&pfifo_qdisc_ops,
580                                            sch->handle)))
581                 p->link.q = &noop_qdisc;
582         DPRINTK("atm_tc_init: link (%p) qdisc %p\n",&p->link,p->link.q);
583         p->link.filter_list = NULL;
584         p->link.vcc = NULL;
585         p->link.sock = NULL;
586         p->link.classid = sch->handle;
587         p->link.ref = 1;
588         p->link.next = NULL;
589         tasklet_init(&p->task,sch_atm_dequeue,(unsigned long) sch);
590         return 0;
591 }
592
593
594 static void atm_tc_reset(struct Qdisc *sch)
595 {
596         struct atm_qdisc_data *p = PRIV(sch);
597         struct atm_flow_data *flow;
598
599         DPRINTK("atm_tc_reset(sch %p,[qdisc %p])\n",sch,p);
600         for (flow = p->flows; flow; flow = flow->next) qdisc_reset(flow->q);
601         sch->q.qlen = 0;
602 }
603
604
605 static void atm_tc_destroy(struct Qdisc *sch)
606 {
607         struct atm_qdisc_data *p = PRIV(sch);
608         struct atm_flow_data *flow;
609
610         DPRINTK("atm_tc_destroy(sch %p,[qdisc %p])\n",sch,p);
611         /* races ? */
612         while ((flow = p->flows)) {
613                 destroy_filters(flow);
614                 if (flow->ref > 1)
615                         printk(KERN_ERR "atm_destroy: %p->ref = %d\n",flow,
616                             flow->ref);
617                 atm_tc_put(sch,(unsigned long) flow);
618                 if (p->flows == flow) {
619                         printk(KERN_ERR "atm_destroy: putting flow %p didn't "
620                             "kill it\n",flow);
621                         p->flows = flow->next; /* brute force */
622                         break;
623                 }
624         }
625         tasklet_kill(&p->task);
626 }
627
628
629 static int atm_tc_dump_class(struct Qdisc *sch, unsigned long cl,
630     struct sk_buff *skb, struct tcmsg *tcm)
631 {
632         struct atm_qdisc_data *p = PRIV(sch);
633         struct atm_flow_data *flow = (struct atm_flow_data *) cl;
634         unsigned char *b = skb->tail;
635         struct rtattr *rta;
636
637         DPRINTK("atm_tc_dump_class(sch %p,[qdisc %p],flow %p,skb %p,tcm %p)\n",
638             sch,p,flow,skb,tcm);
639         if (!find_flow(p,flow)) return -EINVAL;
640         tcm->tcm_handle = flow->classid;
641         tcm->tcm_info = flow->q->handle;
642         rta = (struct rtattr *) b;
643         RTA_PUT(skb,TCA_OPTIONS,0,NULL);
644         RTA_PUT(skb,TCA_ATM_HDR,flow->hdr_len,flow->hdr);
645         if (flow->vcc) {
646                 struct sockaddr_atmpvc pvc;
647                 int state;
648
649                 pvc.sap_family = AF_ATMPVC;
650                 pvc.sap_addr.itf = flow->vcc->dev ? flow->vcc->dev->number : -1;
651                 pvc.sap_addr.vpi = flow->vcc->vpi;
652                 pvc.sap_addr.vci = flow->vcc->vci;
653                 RTA_PUT(skb,TCA_ATM_ADDR,sizeof(pvc),&pvc);
654                 state = ATM_VF2VS(flow->vcc->flags);
655                 RTA_PUT(skb,TCA_ATM_STATE,sizeof(state),&state);
656         }
657         if (flow->excess)
658                 RTA_PUT(skb,TCA_ATM_EXCESS,sizeof(u32),&flow->classid);
659         else {
660                 static u32 zero;
661
662                 RTA_PUT(skb,TCA_ATM_EXCESS,sizeof(zero),&zero);
663         }
664         rta->rta_len = skb->tail-b;
665         return skb->len;
666
667 rtattr_failure:
668         skb_trim(skb,b-skb->data);
669         return -1;
670 }
671 static int
672 atm_tc_dump_class_stats(struct Qdisc *sch, unsigned long arg,
673         struct gnet_dump *d)
674 {
675         struct atm_flow_data *flow = (struct atm_flow_data *) arg;
676
677         flow->qstats.qlen = flow->q->q.qlen;
678
679         if (gnet_stats_copy_basic(d, &flow->bstats) < 0 ||
680             gnet_stats_copy_queue(d, &flow->qstats) < 0)
681                 return -1;
682
683         return 0;
684 }
685
686 static int atm_tc_dump(struct Qdisc *sch, struct sk_buff *skb)
687 {
688         return 0;
689 }
690
691 static struct Qdisc_class_ops atm_class_ops = {
692         .graft          =       atm_tc_graft,
693         .leaf           =       atm_tc_leaf,
694         .get            =       atm_tc_get,
695         .put            =       atm_tc_put,
696         .change         =       atm_tc_change,
697         .delete         =       atm_tc_delete,
698         .walk           =       atm_tc_walk,
699         .tcf_chain      =       atm_tc_find_tcf,
700         .bind_tcf       =       atm_tc_bind_filter,
701         .unbind_tcf     =       atm_tc_put,
702         .dump           =       atm_tc_dump_class,
703         .dump_stats     =       atm_tc_dump_class_stats,
704 };
705
706 static struct Qdisc_ops atm_qdisc_ops = {
707         .next           =       NULL,
708         .cl_ops         =       &atm_class_ops,
709         .id             =       "atm",
710         .priv_size      =       sizeof(struct atm_qdisc_data),
711         .enqueue        =       atm_tc_enqueue,
712         .dequeue        =       atm_tc_dequeue,
713         .requeue        =       atm_tc_requeue,
714         .drop           =       atm_tc_drop,
715         .init           =       atm_tc_init,
716         .reset          =       atm_tc_reset,
717         .destroy        =       atm_tc_destroy,
718         .change         =       NULL,
719         .dump           =       atm_tc_dump,
720         .owner          =       THIS_MODULE,
721 };
722
723
724 static int __init atm_init(void)
725 {
726         return register_qdisc(&atm_qdisc_ops);
727 }
728
729 static void __exit atm_exit(void)
730 {
731         unregister_qdisc(&atm_qdisc_ops);
732 }
733
734 module_init(atm_init)
735 module_exit(atm_exit)
736 MODULE_LICENSE("GPL");