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writeback: split writeback_inodes_wb
[linux-2.6/next.git] / net / sched / sch_atm.c
blobfcbb86a486a21ab3c9a51a63bd248f809817dbd0
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 atm_flow_data *next;
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 atm_flow_data *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 int find_flow(struct atm_qdisc_data *qdisc, struct atm_flow_data *flow)
72 {
73 struct atm_flow_data *walk;
74
75 pr_debug("find_flow(qdisc %p,flow %p)\n", qdisc, flow);
76 for (walk = qdisc->flows; walk; walk = walk->next)
77 if (walk == flow)
78 return 1;
79 pr_debug("find_flow: not found\n");
80 return 0;
81 }
82
83 static inline struct atm_flow_data *lookup_flow(struct Qdisc *sch, u32 classid)
84 {
85 struct atm_qdisc_data *p = qdisc_priv(sch);
86 struct atm_flow_data *flow;
87
88 for (flow = p->flows; flow; flow = flow->next)
89 if (flow->classid == classid)
90 break;
91 return flow;
92 }
93
94 static int atm_tc_graft(struct Qdisc *sch, unsigned long arg,
95 struct Qdisc *new, struct Qdisc **old)
96 {
97 struct atm_qdisc_data *p = qdisc_priv(sch);
98 struct atm_flow_data *flow = (struct atm_flow_data *)arg;
99
100 pr_debug("atm_tc_graft(sch %p,[qdisc %p],flow %p,new %p,old %p)\n",
101 sch, p, flow, new, old);
102 if (!find_flow(p, flow))
103 return -EINVAL;
104 if (!new)
105 new = &noop_qdisc;
106 *old = flow->q;
107 flow->q = new;
108 if (*old)
109 qdisc_reset(*old);
110 return 0;
111 }
112
113 static struct Qdisc *atm_tc_leaf(struct Qdisc *sch, unsigned long cl)
114 {
115 struct atm_flow_data *flow = (struct atm_flow_data *)cl;
116
117 pr_debug("atm_tc_leaf(sch %p,flow %p)\n", sch, flow);
118 return flow ? flow->q : NULL;
119 }
120
121 static unsigned long atm_tc_get(struct Qdisc *sch, u32 classid)
122 {
123 struct atm_qdisc_data *p __maybe_unused = qdisc_priv(sch);
124 struct atm_flow_data *flow;
125
126 pr_debug("atm_tc_get(sch %p,[qdisc %p],classid %x)\n", sch, p, classid);
127 flow = lookup_flow(sch, classid);
128 if (flow)
129 flow->ref++;
130 pr_debug("atm_tc_get: flow %p\n", flow);
131 return (unsigned long)flow;
132 }
133
134 static unsigned long atm_tc_bind_filter(struct Qdisc *sch,
135 unsigned long parent, u32 classid)
136 {
137 return atm_tc_get(sch, classid);
138 }
139
140 /*
141 * atm_tc_put handles all destructions, including the ones that are explicitly
142 * requested (atm_tc_destroy, etc.). The assumption here is that we never drop
143 * anything that still seems to be in use.
144 */
145 static void atm_tc_put(struct Qdisc *sch, unsigned long cl)
146 {
147 struct atm_qdisc_data *p = qdisc_priv(sch);
148 struct atm_flow_data *flow = (struct atm_flow_data *)cl;
149 struct atm_flow_data **prev;
150
151 pr_debug("atm_tc_put(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
152 if (--flow->ref)
153 return;
154 pr_debug("atm_tc_put: destroying\n");
155 for (prev = &p->flows; *prev; prev = &(*prev)->next)
156 if (*prev == flow)
157 break;
158 if (!*prev) {
159 printk(KERN_CRIT "atm_tc_put: class %p not found\n", flow);
160 return;
161 }
162 *prev = flow->next;
163 pr_debug("atm_tc_put: qdisc %p\n", flow->q);
164 qdisc_destroy(flow->q);
165 tcf_destroy_chain(&flow->filter_list);
166 if (flow->sock) {
167 pr_debug("atm_tc_put: f_count %ld\n",
168 file_count(flow->sock->file));
169 flow->vcc->pop = flow->old_pop;
170 sockfd_put(flow->sock);
171 }
172 if (flow->excess)
173 atm_tc_put(sch, (unsigned long)flow->excess);
174 if (flow != &p->link)
175 kfree(flow);
176 /*
177 * If flow == &p->link, the qdisc no longer works at this point and
178 * needs to be removed. (By the caller of atm_tc_put.)
179 */
180 }
181
182 static void sch_atm_pop(struct atm_vcc *vcc, struct sk_buff *skb)
183 {
184 struct atm_qdisc_data *p = VCC2FLOW(vcc)->parent;
185
186 pr_debug("sch_atm_pop(vcc %p,skb %p,[qdisc %p])\n", vcc, skb, p);
187 VCC2FLOW(vcc)->old_pop(vcc, skb);
188 tasklet_schedule(&p->task);
189 }
190
191 static const u8 llc_oui_ip[] = {
192 0xaa, /* DSAP: non-ISO */
193 0xaa, /* SSAP: non-ISO */
194 0x03, /* Ctrl: Unnumbered Information Command PDU */
195 0x00, /* OUI: EtherType */
196 0x00, 0x00,
197 0x08, 0x00
198 }; /* Ethertype IP (0800) */
199
200 static const struct nla_policy atm_policy[TCA_ATM_MAX + 1] = {
201 [TCA_ATM_FD] = { .type = NLA_U32 },
202 [TCA_ATM_EXCESS] = { .type = NLA_U32 },
203 };
204
205 static int atm_tc_change(struct Qdisc *sch, u32 classid, u32 parent,
206 struct nlattr **tca, unsigned long *arg)
207 {
208 struct atm_qdisc_data *p = qdisc_priv(sch);
209 struct atm_flow_data *flow = (struct atm_flow_data *)*arg;
210 struct atm_flow_data *excess = NULL;
211 struct nlattr *opt = tca[TCA_OPTIONS];
212 struct nlattr *tb[TCA_ATM_MAX + 1];
213 struct socket *sock;
214 int fd, error, hdr_len;
215 void *hdr;
216
217 pr_debug("atm_tc_change(sch %p,[qdisc %p],classid %x,parent %x,"
218 "flow %p,opt %p)\n", sch, p, classid, parent, flow, opt);
219 /*
220 * The concept of parents doesn't apply for this qdisc.
221 */
222 if (parent && parent != TC_H_ROOT && parent != sch->handle)
223 return -EINVAL;
224 /*
225 * ATM classes cannot be changed. In order to change properties of the
226 * ATM connection, that socket needs to be modified directly (via the
227 * native ATM API. In order to send a flow to a different VC, the old
228 * class needs to be removed and a new one added. (This may be changed
229 * later.)
230 */
231 if (flow)
232 return -EBUSY;
233 if (opt == NULL)
234 return -EINVAL;
235
236 error = nla_parse_nested(tb, TCA_ATM_MAX, opt, atm_policy);
237 if (error < 0)
238 return error;
239
240 if (!tb[TCA_ATM_FD])
241 return -EINVAL;
242 fd = nla_get_u32(tb[TCA_ATM_FD]);
243 pr_debug("atm_tc_change: fd %d\n", fd);
244 if (tb[TCA_ATM_HDR]) {
245 hdr_len = nla_len(tb[TCA_ATM_HDR]);
246 hdr = nla_data(tb[TCA_ATM_HDR]);
247 } else {
248 hdr_len = RFC1483LLC_LEN;
249 hdr = NULL; /* default LLC/SNAP for IP */
250 }
251 if (!tb[TCA_ATM_EXCESS])
252 excess = NULL;
253 else {
254 excess = (struct atm_flow_data *)
255 atm_tc_get(sch, nla_get_u32(tb[TCA_ATM_EXCESS]));
256 if (!excess)
257 return -ENOENT;
258 }
259 pr_debug("atm_tc_change: type %d, payload %d, hdr_len %d\n",
260 opt->nla_type, nla_len(opt), hdr_len);
261 sock = sockfd_lookup(fd, &error);
262 if (!sock)
263 return error; /* f_count++ */
264 pr_debug("atm_tc_change: f_count %ld\n", file_count(sock->file));
265 if (sock->ops->family != PF_ATMSVC && sock->ops->family != PF_ATMPVC) {
266 error = -EPROTOTYPE;
267 goto err_out;
268 }
269 /* @@@ should check if the socket is really operational or we'll crash
270 on vcc->send */
271 if (classid) {
272 if (TC_H_MAJ(classid ^ sch->handle)) {
273 pr_debug("atm_tc_change: classid mismatch\n");
274 error = -EINVAL;
275 goto err_out;
276 }
277 if (find_flow(p, flow)) {
278 error = -EEXIST;
279 goto err_out;
280 }
281 } else {
282 int i;
283 unsigned long cl;
284
285 for (i = 1; i < 0x8000; i++) {
286 classid = TC_H_MAKE(sch->handle, 0x8000 | i);
287 cl = atm_tc_get(sch, classid);
288 if (!cl)
289 break;
290 atm_tc_put(sch, cl);
291 }
292 }
293 pr_debug("atm_tc_change: new id %x\n", classid);
294 flow = kzalloc(sizeof(struct atm_flow_data) + hdr_len, GFP_KERNEL);
295 pr_debug("atm_tc_change: flow %p\n", flow);
296 if (!flow) {
297 error = -ENOBUFS;
298 goto err_out;
299 }
300 flow->filter_list = NULL;
301 flow->q = qdisc_create_dflt(qdisc_dev(sch), sch->dev_queue,
302 &pfifo_qdisc_ops, classid);
303 if (!flow->q)
304 flow->q = &noop_qdisc;
305 pr_debug("atm_tc_change: qdisc %p\n", flow->q);
306 flow->sock = sock;
307 flow->vcc = ATM_SD(sock); /* speedup */
308 flow->vcc->user_back = flow;
309 pr_debug("atm_tc_change: vcc %p\n", flow->vcc);
310 flow->old_pop = flow->vcc->pop;
311 flow->parent = p;
312 flow->vcc->pop = sch_atm_pop;
313 flow->classid = classid;
314 flow->ref = 1;
315 flow->excess = excess;
316 flow->next = p->link.next;
317 p->link.next = flow;
318 flow->hdr_len = hdr_len;
319 if (hdr)
320 memcpy(flow->hdr, hdr, hdr_len);
321 else
322 memcpy(flow->hdr, llc_oui_ip, sizeof(llc_oui_ip));
323 *arg = (unsigned long)flow;
324 return 0;
325 err_out:
326 if (excess)
327 atm_tc_put(sch, (unsigned long)excess);
328 sockfd_put(sock);
329 return error;
330 }
331
332 static int atm_tc_delete(struct Qdisc *sch, unsigned long arg)
333 {
334 struct atm_qdisc_data *p = qdisc_priv(sch);
335 struct atm_flow_data *flow = (struct atm_flow_data *)arg;
336
337 pr_debug("atm_tc_delete(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
338 if (!find_flow(qdisc_priv(sch), flow))
339 return -EINVAL;
340 if (flow->filter_list || flow == &p->link)
341 return -EBUSY;
342 /*
343 * Reference count must be 2: one for "keepalive" (set at class
344 * creation), and one for the reference held when calling delete.
345 */
346 if (flow->ref < 2) {
347 printk(KERN_ERR "atm_tc_delete: flow->ref == %d\n", flow->ref);
348 return -EINVAL;
349 }
350 if (flow->ref > 2)
351 return -EBUSY; /* catch references via excess, etc. */
352 atm_tc_put(sch, arg);
353 return 0;
354 }
355
356 static void atm_tc_walk(struct Qdisc *sch, struct qdisc_walker *walker)
357 {
358 struct atm_qdisc_data *p = qdisc_priv(sch);
359 struct atm_flow_data *flow;
360
361 pr_debug("atm_tc_walk(sch %p,[qdisc %p],walker %p)\n", sch, p, walker);
362 if (walker->stop)
363 return;
364 for (flow = p->flows; flow; flow = flow->next) {
365 if (walker->count >= walker->skip)
366 if (walker->fn(sch, (unsigned long)flow, walker) < 0) {
367 walker->stop = 1;
368 break;
369 }
370 walker->count++;
371 }
372 }
373
374 static struct tcf_proto **atm_tc_find_tcf(struct Qdisc *sch, unsigned long cl)
375 {
376 struct atm_qdisc_data *p = qdisc_priv(sch);
377 struct atm_flow_data *flow = (struct atm_flow_data *)cl;
378
379 pr_debug("atm_tc_find_tcf(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
380 return flow ? &flow->filter_list : &p->link.filter_list;
381 }
382
383 /* --------------------------- Qdisc operations ---------------------------- */
384
385 static int atm_tc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
386 {
387 struct atm_qdisc_data *p = qdisc_priv(sch);
388 struct atm_flow_data *flow = NULL; /* @@@ */
389 struct tcf_result res;
390 int result;
391 int ret = NET_XMIT_POLICED;
392
393 pr_debug("atm_tc_enqueue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p);
394 result = TC_POLICE_OK; /* be nice to gcc */
395 if (TC_H_MAJ(skb->priority) != sch->handle ||
396 !(flow = (struct atm_flow_data *)atm_tc_get(sch, skb->priority)))
397 for (flow = p->flows; flow; flow = flow->next)
398 if (flow->filter_list) {
399 result = tc_classify_compat(skb,
400 flow->filter_list,
401 &res);
402 if (result < 0)
403 continue;
404 flow = (struct atm_flow_data *)res.class;
405 if (!flow)
406 flow = lookup_flow(sch, res.classid);
407 break;
408 }
409 if (!flow)
410 flow = &p->link;
411 else {
412 if (flow->vcc)
413 ATM_SKB(skb)->atm_options = flow->vcc->atm_options;
414 /*@@@ looks good ... but it's not supposed to work :-) */
415 #ifdef CONFIG_NET_CLS_ACT
416 switch (result) {
417 case TC_ACT_QUEUED:
418 case TC_ACT_STOLEN:
419 kfree_skb(skb);
420 return NET_XMIT_SUCCESS | __NET_XMIT_STOLEN;
421 case TC_ACT_SHOT:
422 kfree_skb(skb);
423 goto drop;
424 case TC_POLICE_RECLASSIFY:
425 if (flow->excess)
426 flow = flow->excess;
427 else
428 ATM_SKB(skb)->atm_options |= ATM_ATMOPT_CLP;
429 break;
430 }
431 #endif
432 }
433
434 ret = qdisc_enqueue(skb, flow->q);
435 if (ret != 0) {
436 drop: __maybe_unused
437 if (net_xmit_drop_count(ret)) {
438 sch->qstats.drops++;
439 if (flow)
440 flow->qstats.drops++;
441 }
442 return ret;
443 }
444 sch->bstats.bytes += qdisc_pkt_len(skb);
445 sch->bstats.packets++;
446 flow->bstats.bytes += qdisc_pkt_len(skb);
447 flow->bstats.packets++;
448 /*
449 * Okay, this may seem weird. We pretend we've dropped the packet if
450 * it goes via ATM. The reason for this is that the outer qdisc
451 * expects to be able to q->dequeue the packet later on if we return
452 * success at this place. Also, sch->q.qdisc needs to reflect whether
453 * there is a packet egligible for dequeuing or not. Note that the
454 * statistics of the outer qdisc are necessarily wrong because of all
455 * this. There's currently no correct solution for this.
456 */
457 if (flow == &p->link) {
458 sch->q.qlen++;
459 return 0;
460 }
461 tasklet_schedule(&p->task);
462 return NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
463 }
464
465 /*
466 * Dequeue packets and send them over ATM. Note that we quite deliberately
467 * avoid checking net_device's flow control here, simply because sch_atm
468 * uses its own channels, which have nothing to do with any CLIP/LANE/or
469 * non-ATM interfaces.
470 */
471
472 static void sch_atm_dequeue(unsigned long data)
473 {
474 struct Qdisc *sch = (struct Qdisc *)data;
475 struct atm_qdisc_data *p = qdisc_priv(sch);
476 struct atm_flow_data *flow;
477 struct sk_buff *skb;
478
479 pr_debug("sch_atm_dequeue(sch %p,[qdisc %p])\n", sch, p);
480 for (flow = p->link.next; flow; flow = flow->next)
481 /*
482 * If traffic is properly shaped, this won't generate nasty
483 * little bursts. Otherwise, it may ... (but that's okay)
484 */
485 while ((skb = flow->q->ops->peek(flow->q))) {
486 if (!atm_may_send(flow->vcc, skb->truesize))
487 break;
488
489 skb = qdisc_dequeue_peeked(flow->q);
490 if (unlikely(!skb))
491 break;
492
493 pr_debug("atm_tc_dequeue: sending on class %p\n", flow);
494 /* remove any LL header somebody else has attached */
495 skb_pull(skb, skb_network_offset(skb));
496 if (skb_headroom(skb) < flow->hdr_len) {
497 struct sk_buff *new;
498
499 new = skb_realloc_headroom(skb, flow->hdr_len);
500 dev_kfree_skb(skb);
501 if (!new)
502 continue;
503 skb = new;
504 }
505 pr_debug("sch_atm_dequeue: ip %p, data %p\n",
506 skb_network_header(skb), skb->data);
507 ATM_SKB(skb)->vcc = flow->vcc;
508 memcpy(skb_push(skb, flow->hdr_len), flow->hdr,
509 flow->hdr_len);
510 atomic_add(skb->truesize,
511 &sk_atm(flow->vcc)->sk_wmem_alloc);
512 /* atm.atm_options are already set by atm_tc_enqueue */
513 flow->vcc->send(flow->vcc, skb);
514 }
515 }
516
517 static struct sk_buff *atm_tc_dequeue(struct Qdisc *sch)
518 {
519 struct atm_qdisc_data *p = qdisc_priv(sch);
520 struct sk_buff *skb;
521
522 pr_debug("atm_tc_dequeue(sch %p,[qdisc %p])\n", sch, p);
523 tasklet_schedule(&p->task);
524 skb = qdisc_dequeue_peeked(p->link.q);
525 if (skb)
526 sch->q.qlen--;
527 return skb;
528 }
529
530 static struct sk_buff *atm_tc_peek(struct Qdisc *sch)
531 {
532 struct atm_qdisc_data *p = qdisc_priv(sch);
533
534 pr_debug("atm_tc_peek(sch %p,[qdisc %p])\n", sch, p);
535
536 return p->link.q->ops->peek(p->link.q);
537 }
538
539 static unsigned int atm_tc_drop(struct Qdisc *sch)
540 {
541 struct atm_qdisc_data *p = qdisc_priv(sch);
542 struct atm_flow_data *flow;
543 unsigned int len;
544
545 pr_debug("atm_tc_drop(sch %p,[qdisc %p])\n", sch, p);
546 for (flow = p->flows; flow; flow = flow->next)
547 if (flow->q->ops->drop && (len = flow->q->ops->drop(flow->q)))
548 return len;
549 return 0;
550 }
551
552 static int atm_tc_init(struct Qdisc *sch, struct nlattr *opt)
553 {
554 struct atm_qdisc_data *p = qdisc_priv(sch);
555
556 pr_debug("atm_tc_init(sch %p,[qdisc %p],opt %p)\n", sch, p, opt);
557 p->flows = &p->link;
558 p->link.q = qdisc_create_dflt(qdisc_dev(sch), sch->dev_queue,
559 &pfifo_qdisc_ops, sch->handle);
560 if (!p->link.q)
561 p->link.q = &noop_qdisc;
562 pr_debug("atm_tc_init: link (%p) qdisc %p\n", &p->link, p->link.q);
563 p->link.filter_list = NULL;
564 p->link.vcc = NULL;
565 p->link.sock = NULL;
566 p->link.classid = sch->handle;
567 p->link.ref = 1;
568 p->link.next = NULL;
569 tasklet_init(&p->task, sch_atm_dequeue, (unsigned long)sch);
570 return 0;
571 }
572
573 static void atm_tc_reset(struct Qdisc *sch)
574 {
575 struct atm_qdisc_data *p = qdisc_priv(sch);
576 struct atm_flow_data *flow;
577
578 pr_debug("atm_tc_reset(sch %p,[qdisc %p])\n", sch, p);
579 for (flow = p->flows; flow; flow = flow->next)
580 qdisc_reset(flow->q);
581 sch->q.qlen = 0;
582 }
583
584 static void atm_tc_destroy(struct Qdisc *sch)
585 {
586 struct atm_qdisc_data *p = qdisc_priv(sch);
587 struct atm_flow_data *flow;
588
589 pr_debug("atm_tc_destroy(sch %p,[qdisc %p])\n", sch, p);
590 for (flow = p->flows; flow; flow = flow->next)
591 tcf_destroy_chain(&flow->filter_list);
592
593 /* races ? */
594 while ((flow = p->flows)) {
595 if (flow->ref > 1)
596 printk(KERN_ERR "atm_destroy: %p->ref = %d\n", flow,
597 flow->ref);
598 atm_tc_put(sch, (unsigned long)flow);
599 if (p->flows == flow) {
600 printk(KERN_ERR "atm_destroy: putting flow %p didn't "
601 "kill it\n", flow);
602 p->flows = flow->next; /* brute force */
603 break;
604 }
605 }
606 tasklet_kill(&p->task);
607 }
608
609 static int atm_tc_dump_class(struct Qdisc *sch, unsigned long cl,
610 struct sk_buff *skb, struct tcmsg *tcm)
611 {
612 struct atm_qdisc_data *p = qdisc_priv(sch);
613 struct atm_flow_data *flow = (struct atm_flow_data *)cl;
614 struct nlattr *nest;
615
616 pr_debug("atm_tc_dump_class(sch %p,[qdisc %p],flow %p,skb %p,tcm %p)\n",
617 sch, p, flow, skb, tcm);
618 if (!find_flow(p, flow))
619 return -EINVAL;
620 tcm->tcm_handle = flow->classid;
621 tcm->tcm_info = flow->q->handle;
622
623 nest = nla_nest_start(skb, TCA_OPTIONS);
624 if (nest == NULL)
625 goto nla_put_failure;
626
627 NLA_PUT(skb, TCA_ATM_HDR, flow->hdr_len, flow->hdr);
628 if (flow->vcc) {
629 struct sockaddr_atmpvc pvc;
630 int state;
631
632 pvc.sap_family = AF_ATMPVC;
633 pvc.sap_addr.itf = flow->vcc->dev ? flow->vcc->dev->number : -1;
634 pvc.sap_addr.vpi = flow->vcc->vpi;
635 pvc.sap_addr.vci = flow->vcc->vci;
636 NLA_PUT(skb, TCA_ATM_ADDR, sizeof(pvc), &pvc);
637 state = ATM_VF2VS(flow->vcc->flags);
638 NLA_PUT_U32(skb, TCA_ATM_STATE, state);
639 }
640 if (flow->excess)
641 NLA_PUT_U32(skb, TCA_ATM_EXCESS, flow->classid);
642 else {
643 NLA_PUT_U32(skb, TCA_ATM_EXCESS, 0);
644 }
645
646 nla_nest_end(skb, nest);
647 return skb->len;
648
649 nla_put_failure:
650 nla_nest_cancel(skb, nest);
651 return -1;
652 }
653 static int
654 atm_tc_dump_class_stats(struct Qdisc *sch, unsigned long arg,
655 struct gnet_dump *d)
656 {
657 struct atm_flow_data *flow = (struct atm_flow_data *)arg;
658
659 flow->qstats.qlen = flow->q->q.qlen;
660
661 if (gnet_stats_copy_basic(d, &flow->bstats) < 0 ||
662 gnet_stats_copy_queue(d, &flow->qstats) < 0)
663 return -1;
664
665 return 0;
666 }
667
668 static int atm_tc_dump(struct Qdisc *sch, struct sk_buff *skb)
669 {
670 return 0;
671 }
672
673 static const struct Qdisc_class_ops atm_class_ops = {
674 .graft = atm_tc_graft,
675 .leaf = atm_tc_leaf,
676 .get = atm_tc_get,
677 .put = atm_tc_put,
678 .change = atm_tc_change,
679 .delete = atm_tc_delete,
680 .walk = atm_tc_walk,
681 .tcf_chain = atm_tc_find_tcf,
682 .bind_tcf = atm_tc_bind_filter,
683 .unbind_tcf = atm_tc_put,
684 .dump = atm_tc_dump_class,
685 .dump_stats = atm_tc_dump_class_stats,
686 };
687
688 static struct Qdisc_ops atm_qdisc_ops __read_mostly = {
689 .cl_ops = &atm_class_ops,
690 .id = "atm",
691 .priv_size = sizeof(struct atm_qdisc_data),
692 .enqueue = atm_tc_enqueue,
693 .dequeue = atm_tc_dequeue,
694 .peek = atm_tc_peek,
695 .drop = atm_tc_drop,
696 .init = atm_tc_init,
697 .reset = atm_tc_reset,
698 .destroy = atm_tc_destroy,
699 .dump = atm_tc_dump,
700 .owner = THIS_MODULE,
701 };
702
703 static int __init atm_init(void)
704 {
705 return register_qdisc(&atm_qdisc_ops);
706 }
707
708 static void __exit atm_exit(void)
709 {
710 unregister_qdisc(&atm_qdisc_ops);
711 }
712
713 module_init(atm_init)
714 module_exit(atm_exit)
715 MODULE_LICENSE("GPL");
linux-next