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ps3fb: kill superfluous zero initializations
[pv_ops_mirror.git] / net / sched / sch_dsmark.c
blob3c6fd181263f7ac68bc2e29d30938a968479099d
1 /* net/sched/sch_dsmark.c - Differentiated Services field marker */
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/types.h>
9 #include <linux/string.h>
10 #include <linux/errno.h>
11 #include <linux/skbuff.h>
12 #include <linux/netdevice.h> /* for pkt_sched */
13 #include <linux/rtnetlink.h>
14 #include <net/pkt_sched.h>
15 #include <net/dsfield.h>
16 #include <net/inet_ecn.h>
17 #include <asm/byteorder.h>
18
19
20 #if 0 /* control */
21 #define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
22 #else
23 #define DPRINTK(format,args...)
24 #endif
25
26 #if 0 /* data */
27 #define D2PRINTK(format,args...) printk(KERN_DEBUG format,##args)
28 #else
29 #define D2PRINTK(format,args...)
30 #endif
31
32
33 #define PRIV(sch) ((struct dsmark_qdisc_data *) qdisc_priv(sch))
34
35
36 /*
37 * classid class marking
38 * ------- ----- -------
39 * n/a 0 n/a
40 * x:0 1 use entry [0]
41 * ... ... ...
42 * x:y y>0 y+1 use entry [y]
43 * ... ... ...
44 * x:indices-1 indices use entry [indices-1]
45 * ... ... ...
46 * x:y y+1 use entry [y & (indices-1)]
47 * ... ... ...
48 * 0xffff 0x10000 use entry [indices-1]
49 */
50
51
52 #define NO_DEFAULT_INDEX (1 << 16)
53
54 struct dsmark_qdisc_data {
55 struct Qdisc *q;
56 struct tcf_proto *filter_list;
57 u8 *mask; /* "owns" the array */
58 u8 *value;
59 u16 indices;
60 u32 default_index; /* index range is 0...0xffff */
61 int set_tc_index;
62 };
63
64 static inline int dsmark_valid_indices(u16 indices)
65 {
66 while (indices != 1) {
67 if (indices & 1)
68 return 0;
69 indices >>= 1;
70 }
71
72 return 1;
73 }
74
75 static inline int dsmark_valid_index(struct dsmark_qdisc_data *p, u16 index)
76 {
77 return (index <= p->indices && index > 0);
78 }
79
80 /* ------------------------- Class/flow operations ------------------------- */
81
82 static int dsmark_graft(struct Qdisc *sch, unsigned long arg,
83 struct Qdisc *new, struct Qdisc **old)
84 {
85 struct dsmark_qdisc_data *p = PRIV(sch);
86
87 DPRINTK("dsmark_graft(sch %p,[qdisc %p],new %p,old %p)\n",
88 sch, p, new, old);
89
90 if (new == NULL) {
91 new = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops,
92 sch->handle);
93 if (new == NULL)
94 new = &noop_qdisc;
95 }
96
97 sch_tree_lock(sch);
98 *old = xchg(&p->q, new);
99 qdisc_tree_decrease_qlen(*old, (*old)->q.qlen);
100 qdisc_reset(*old);
101 sch_tree_unlock(sch);
102
103 return 0;
104 }
105
106 static struct Qdisc *dsmark_leaf(struct Qdisc *sch, unsigned long arg)
107 {
108 return PRIV(sch)->q;
109 }
110
111 static unsigned long dsmark_get(struct Qdisc *sch, u32 classid)
112 {
113 DPRINTK("dsmark_get(sch %p,[qdisc %p],classid %x)\n",
114 sch, PRIV(sch), classid);
115
116 return TC_H_MIN(classid) + 1;
117 }
118
119 static unsigned long dsmark_bind_filter(struct Qdisc *sch,
120 unsigned long parent, u32 classid)
121 {
122 return dsmark_get(sch, classid);
123 }
124
125 static void dsmark_put(struct Qdisc *sch, unsigned long cl)
126 {
127 }
128
129 static int dsmark_change(struct Qdisc *sch, u32 classid, u32 parent,
130 struct rtattr **tca, unsigned long *arg)
131 {
132 struct dsmark_qdisc_data *p = PRIV(sch);
133 struct rtattr *opt = tca[TCA_OPTIONS-1];
134 struct rtattr *tb[TCA_DSMARK_MAX];
135 int err = -EINVAL;
136 u8 mask = 0;
137
138 DPRINTK("dsmark_change(sch %p,[qdisc %p],classid %x,parent %x),"
139 "arg 0x%lx\n", sch, p, classid, parent, *arg);
140
141 if (!dsmark_valid_index(p, *arg)) {
142 err = -ENOENT;
143 goto rtattr_failure;
144 }
145
146 if (!opt || rtattr_parse_nested(tb, TCA_DSMARK_MAX, opt))
147 goto rtattr_failure;
148
149 if (tb[TCA_DSMARK_MASK-1])
150 mask = RTA_GET_U8(tb[TCA_DSMARK_MASK-1]);
151
152 if (tb[TCA_DSMARK_VALUE-1])
153 p->value[*arg-1] = RTA_GET_U8(tb[TCA_DSMARK_VALUE-1]);
154
155 if (tb[TCA_DSMARK_MASK-1])
156 p->mask[*arg-1] = mask;
157
158 err = 0;
159
160 rtattr_failure:
161 return err;
162 }
163
164 static int dsmark_delete(struct Qdisc *sch, unsigned long arg)
165 {
166 struct dsmark_qdisc_data *p = PRIV(sch);
167
168 if (!dsmark_valid_index(p, arg))
169 return -EINVAL;
170
171 p->mask[arg-1] = 0xff;
172 p->value[arg-1] = 0;
173
174 return 0;
175 }
176
177 static void dsmark_walk(struct Qdisc *sch,struct qdisc_walker *walker)
178 {
179 struct dsmark_qdisc_data *p = PRIV(sch);
180 int i;
181
182 DPRINTK("dsmark_walk(sch %p,[qdisc %p],walker %p)\n", sch, p, walker);
183
184 if (walker->stop)
185 return;
186
187 for (i = 0; i < p->indices; i++) {
188 if (p->mask[i] == 0xff && !p->value[i])
189 goto ignore;
190 if (walker->count >= walker->skip) {
191 if (walker->fn(sch, i+1, walker) < 0) {
192 walker->stop = 1;
193 break;
194 }
195 }
196 ignore:
197 walker->count++;
198 }
199 }
200
201 static struct tcf_proto **dsmark_find_tcf(struct Qdisc *sch,unsigned long cl)
202 {
203 return &PRIV(sch)->filter_list;
204 }
205
206 /* --------------------------- Qdisc operations ---------------------------- */
207
208 static int dsmark_enqueue(struct sk_buff *skb,struct Qdisc *sch)
209 {
210 struct dsmark_qdisc_data *p = PRIV(sch);
211 int err;
212
213 D2PRINTK("dsmark_enqueue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p);
214
215 if (p->set_tc_index) {
216 /* FIXME: Safe with non-linear skbs? --RR */
217 switch (skb->protocol) {
218 case __constant_htons(ETH_P_IP):
219 skb->tc_index = ipv4_get_dsfield(ip_hdr(skb))
220 & ~INET_ECN_MASK;
221 break;
222 case __constant_htons(ETH_P_IPV6):
223 skb->tc_index = ipv6_get_dsfield(ipv6_hdr(skb))
224 & ~INET_ECN_MASK;
225 break;
226 default:
227 skb->tc_index = 0;
228 break;
229 }
230 }
231
232 if (TC_H_MAJ(skb->priority) == sch->handle)
233 skb->tc_index = TC_H_MIN(skb->priority);
234 else {
235 struct tcf_result res;
236 int result = tc_classify(skb, p->filter_list, &res);
237
238 D2PRINTK("result %d class 0x%04x\n", result, res.classid);
239
240 switch (result) {
241 #ifdef CONFIG_NET_CLS_POLICE
242 case TC_POLICE_SHOT:
243 kfree_skb(skb);
244 sch->qstats.drops++;
245 return NET_XMIT_POLICED;
246 #if 0
247 case TC_POLICE_RECLASSIFY:
248 /* FIXME: what to do here ??? */
249 #endif
250 #endif
251 case TC_POLICE_OK:
252 skb->tc_index = TC_H_MIN(res.classid);
253 break;
254 case TC_POLICE_UNSPEC:
255 /* fall through */
256 default:
257 if (p->default_index != NO_DEFAULT_INDEX)
258 skb->tc_index = p->default_index;
259 break;
260 }
261 }
262
263 err = p->q->enqueue(skb,p->q);
264 if (err != NET_XMIT_SUCCESS) {
265 sch->qstats.drops++;
266 return err;
267 }
268
269 sch->bstats.bytes += skb->len;
270 sch->bstats.packets++;
271 sch->q.qlen++;
272
273 return NET_XMIT_SUCCESS;
274 }
275
276 static struct sk_buff *dsmark_dequeue(struct Qdisc *sch)
277 {
278 struct dsmark_qdisc_data *p = PRIV(sch);
279 struct sk_buff *skb;
280 u32 index;
281
282 D2PRINTK("dsmark_dequeue(sch %p,[qdisc %p])\n", sch, p);
283
284 skb = p->q->ops->dequeue(p->q);
285 if (skb == NULL)
286 return NULL;
287
288 sch->q.qlen--;
289
290 index = skb->tc_index & (p->indices - 1);
291 D2PRINTK("index %d->%d\n", skb->tc_index, index);
292
293 switch (skb->protocol) {
294 case __constant_htons(ETH_P_IP):
295 ipv4_change_dsfield(ip_hdr(skb), p->mask[index],
296 p->value[index]);
297 break;
298 case __constant_htons(ETH_P_IPV6):
299 ipv6_change_dsfield(ipv6_hdr(skb), p->mask[index],
300 p->value[index]);
301 break;
302 default:
303 /*
304 * Only complain if a change was actually attempted.
305 * This way, we can send non-IP traffic through dsmark
306 * and don't need yet another qdisc as a bypass.
307 */
308 if (p->mask[index] != 0xff || p->value[index])
309 printk(KERN_WARNING "dsmark_dequeue: "
310 "unsupported protocol %d\n",
311 ntohs(skb->protocol));
312 break;
313 }
314
315 return skb;
316 }
317
318 static int dsmark_requeue(struct sk_buff *skb,struct Qdisc *sch)
319 {
320 struct dsmark_qdisc_data *p = PRIV(sch);
321 int err;
322
323 D2PRINTK("dsmark_requeue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p);
324
325 err = p->q->ops->requeue(skb, p->q);
326 if (err != NET_XMIT_SUCCESS) {
327 sch->qstats.drops++;
328 return err;
329 }
330
331 sch->q.qlen++;
332 sch->qstats.requeues++;
333
334 return NET_XMIT_SUCCESS;
335 }
336
337 static unsigned int dsmark_drop(struct Qdisc *sch)
338 {
339 struct dsmark_qdisc_data *p = PRIV(sch);
340 unsigned int len;
341
342 DPRINTK("dsmark_reset(sch %p,[qdisc %p])\n", sch, p);
343
344 if (p->q->ops->drop == NULL)
345 return 0;
346
347 len = p->q->ops->drop(p->q);
348 if (len)
349 sch->q.qlen--;
350
351 return len;
352 }
353
354 static int dsmark_init(struct Qdisc *sch, struct rtattr *opt)
355 {
356 struct dsmark_qdisc_data *p = PRIV(sch);
357 struct rtattr *tb[TCA_DSMARK_MAX];
358 int err = -EINVAL;
359 u32 default_index = NO_DEFAULT_INDEX;
360 u16 indices;
361 u8 *mask;
362
363 DPRINTK("dsmark_init(sch %p,[qdisc %p],opt %p)\n", sch, p, opt);
364
365 if (!opt || rtattr_parse_nested(tb, TCA_DSMARK_MAX, opt) < 0)
366 goto errout;
367
368 indices = RTA_GET_U16(tb[TCA_DSMARK_INDICES-1]);
369 if (!indices || !dsmark_valid_indices(indices))
370 goto errout;
371
372 if (tb[TCA_DSMARK_DEFAULT_INDEX-1])
373 default_index = RTA_GET_U16(tb[TCA_DSMARK_DEFAULT_INDEX-1]);
374
375 mask = kmalloc(indices * 2, GFP_KERNEL);
376 if (mask == NULL) {
377 err = -ENOMEM;
378 goto errout;
379 }
380
381 p->mask = mask;
382 memset(p->mask, 0xff, indices);
383
384 p->value = p->mask + indices;
385 memset(p->value, 0, indices);
386
387 p->indices = indices;
388 p->default_index = default_index;
389 p->set_tc_index = RTA_GET_FLAG(tb[TCA_DSMARK_SET_TC_INDEX-1]);
390
391 p->q = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops, sch->handle);
392 if (p->q == NULL)
393 p->q = &noop_qdisc;
394
395 DPRINTK("dsmark_init: qdisc %p\n", p->q);
396
397 err = 0;
398 errout:
399 rtattr_failure:
400 return err;
401 }
402
403 static void dsmark_reset(struct Qdisc *sch)
404 {
405 struct dsmark_qdisc_data *p = PRIV(sch);
406
407 DPRINTK("dsmark_reset(sch %p,[qdisc %p])\n", sch, p);
408 qdisc_reset(p->q);
409 sch->q.qlen = 0;
410 }
411
412 static void dsmark_destroy(struct Qdisc *sch)
413 {
414 struct dsmark_qdisc_data *p = PRIV(sch);
415
416 DPRINTK("dsmark_destroy(sch %p,[qdisc %p])\n", sch, p);
417
418 tcf_destroy_chain(p->filter_list);
419 qdisc_destroy(p->q);
420 kfree(p->mask);
421 }
422
423 static int dsmark_dump_class(struct Qdisc *sch, unsigned long cl,
424 struct sk_buff *skb, struct tcmsg *tcm)
425 {
426 struct dsmark_qdisc_data *p = PRIV(sch);
427 struct rtattr *opts = NULL;
428
429 DPRINTK("dsmark_dump_class(sch %p,[qdisc %p],class %ld\n", sch, p, cl);
430
431 if (!dsmark_valid_index(p, cl))
432 return -EINVAL;
433
434 tcm->tcm_handle = TC_H_MAKE(TC_H_MAJ(sch->handle), cl-1);
435 tcm->tcm_info = p->q->handle;
436
437 opts = RTA_NEST(skb, TCA_OPTIONS);
438 RTA_PUT_U8(skb,TCA_DSMARK_MASK, p->mask[cl-1]);
439 RTA_PUT_U8(skb,TCA_DSMARK_VALUE, p->value[cl-1]);
440
441 return RTA_NEST_END(skb, opts);
442
443 rtattr_failure:
444 return RTA_NEST_CANCEL(skb, opts);
445 }
446
447 static int dsmark_dump(struct Qdisc *sch, struct sk_buff *skb)
448 {
449 struct dsmark_qdisc_data *p = PRIV(sch);
450 struct rtattr *opts = NULL;
451
452 opts = RTA_NEST(skb, TCA_OPTIONS);
453 RTA_PUT_U16(skb, TCA_DSMARK_INDICES, p->indices);
454
455 if (p->default_index != NO_DEFAULT_INDEX)
456 RTA_PUT_U16(skb, TCA_DSMARK_DEFAULT_INDEX, p->default_index);
457
458 if (p->set_tc_index)
459 RTA_PUT_FLAG(skb, TCA_DSMARK_SET_TC_INDEX);
460
461 return RTA_NEST_END(skb, opts);
462
463 rtattr_failure:
464 return RTA_NEST_CANCEL(skb, opts);
465 }
466
467 static struct Qdisc_class_ops dsmark_class_ops = {
468 .graft = dsmark_graft,
469 .leaf = dsmark_leaf,
470 .get = dsmark_get,
471 .put = dsmark_put,
472 .change = dsmark_change,
473 .delete = dsmark_delete,
474 .walk = dsmark_walk,
475 .tcf_chain = dsmark_find_tcf,
476 .bind_tcf = dsmark_bind_filter,
477 .unbind_tcf = dsmark_put,
478 .dump = dsmark_dump_class,
479 };
480
481 static struct Qdisc_ops dsmark_qdisc_ops = {
482 .next = NULL,
483 .cl_ops = &dsmark_class_ops,
484 .id = "dsmark",
485 .priv_size = sizeof(struct dsmark_qdisc_data),
486 .enqueue = dsmark_enqueue,
487 .dequeue = dsmark_dequeue,
488 .requeue = dsmark_requeue,
489 .drop = dsmark_drop,
490 .init = dsmark_init,
491 .reset = dsmark_reset,
492 .destroy = dsmark_destroy,
493 .change = NULL,
494 .dump = dsmark_dump,
495 .owner = THIS_MODULE,
496 };
497
498 static int __init dsmark_module_init(void)
499 {
500 return register_qdisc(&dsmark_qdisc_ops);
501 }
502
503 static void __exit dsmark_module_exit(void)
504 {
505 unregister_qdisc(&dsmark_qdisc_ops);
506 }
507
508 module_init(dsmark_module_init)
509 module_exit(dsmark_module_exit)
510
511 MODULE_LICENSE("GPL");
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