e1000: Add device IDs of blade version of the 82571 quad port
[pv_ops_mirror.git] / net / sched / sch_dsmark.c
blob60f89199e3da861f8c1af675fa402f071328c3d5
1 /* net/sched/sch_dsmark.c - Differentiated Services field marker */
3 /* Written 1998-2000 by Werner Almesberger, EPFL ICA */
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/rtnetlink.h>
13 #include <net/pkt_sched.h>
14 #include <net/dsfield.h>
15 #include <net/inet_ecn.h>
16 #include <asm/byteorder.h>
19 #if 0 /* control */
20 #define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
21 #else
22 #define DPRINTK(format,args...)
23 #endif
25 #if 0 /* data */
26 #define D2PRINTK(format,args...) printk(KERN_DEBUG format,##args)
27 #else
28 #define D2PRINTK(format,args...)
29 #endif
32 #define PRIV(sch) ((struct dsmark_qdisc_data *) qdisc_priv(sch))
36 * classid class marking
37 * ------- ----- -------
38 * n/a 0 n/a
39 * x:0 1 use entry [0]
40 * ... ... ...
41 * x:y y>0 y+1 use entry [y]
42 * ... ... ...
43 * x:indices-1 indices use entry [indices-1]
44 * ... ... ...
45 * x:y y+1 use entry [y & (indices-1)]
46 * ... ... ...
47 * 0xffff 0x10000 use entry [indices-1]
51 #define NO_DEFAULT_INDEX (1 << 16)
53 struct dsmark_qdisc_data {
54 struct Qdisc *q;
55 struct tcf_proto *filter_list;
56 u8 *mask; /* "owns" the array */
57 u8 *value;
58 u16 indices;
59 u32 default_index; /* index range is 0...0xffff */
60 int set_tc_index;
63 static inline int dsmark_valid_indices(u16 indices)
65 while (indices != 1) {
66 if (indices & 1)
67 return 0;
68 indices >>= 1;
71 return 1;
74 static inline int dsmark_valid_index(struct dsmark_qdisc_data *p, u16 index)
76 return (index <= p->indices && index > 0);
79 /* ------------------------- Class/flow operations ------------------------- */
81 static int dsmark_graft(struct Qdisc *sch, unsigned long arg,
82 struct Qdisc *new, struct Qdisc **old)
84 struct dsmark_qdisc_data *p = PRIV(sch);
86 DPRINTK("dsmark_graft(sch %p,[qdisc %p],new %p,old %p)\n",
87 sch, p, new, old);
89 if (new == NULL) {
90 new = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops,
91 sch->handle);
92 if (new == NULL)
93 new = &noop_qdisc;
96 sch_tree_lock(sch);
97 *old = xchg(&p->q, new);
98 qdisc_tree_decrease_qlen(*old, (*old)->q.qlen);
99 qdisc_reset(*old);
100 sch_tree_unlock(sch);
102 return 0;
105 static struct Qdisc *dsmark_leaf(struct Qdisc *sch, unsigned long arg)
107 return PRIV(sch)->q;
110 static unsigned long dsmark_get(struct Qdisc *sch, u32 classid)
112 DPRINTK("dsmark_get(sch %p,[qdisc %p],classid %x)\n",
113 sch, PRIV(sch), classid);
115 return TC_H_MIN(classid) + 1;
118 static unsigned long dsmark_bind_filter(struct Qdisc *sch,
119 unsigned long parent, u32 classid)
121 return dsmark_get(sch, classid);
124 static void dsmark_put(struct Qdisc *sch, unsigned long cl)
128 static int dsmark_change(struct Qdisc *sch, u32 classid, u32 parent,
129 struct rtattr **tca, unsigned long *arg)
131 struct dsmark_qdisc_data *p = PRIV(sch);
132 struct rtattr *opt = tca[TCA_OPTIONS-1];
133 struct rtattr *tb[TCA_DSMARK_MAX];
134 int err = -EINVAL;
135 u8 mask = 0;
137 DPRINTK("dsmark_change(sch %p,[qdisc %p],classid %x,parent %x),"
138 "arg 0x%lx\n", sch, p, classid, parent, *arg);
140 if (!dsmark_valid_index(p, *arg)) {
141 err = -ENOENT;
142 goto rtattr_failure;
145 if (!opt || rtattr_parse_nested(tb, TCA_DSMARK_MAX, opt))
146 goto rtattr_failure;
148 if (tb[TCA_DSMARK_MASK-1])
149 mask = RTA_GET_U8(tb[TCA_DSMARK_MASK-1]);
151 if (tb[TCA_DSMARK_VALUE-1])
152 p->value[*arg-1] = RTA_GET_U8(tb[TCA_DSMARK_VALUE-1]);
154 if (tb[TCA_DSMARK_MASK-1])
155 p->mask[*arg-1] = mask;
157 err = 0;
159 rtattr_failure:
160 return err;
163 static int dsmark_delete(struct Qdisc *sch, unsigned long arg)
165 struct dsmark_qdisc_data *p = PRIV(sch);
167 if (!dsmark_valid_index(p, arg))
168 return -EINVAL;
170 p->mask[arg-1] = 0xff;
171 p->value[arg-1] = 0;
173 return 0;
176 static void dsmark_walk(struct Qdisc *sch,struct qdisc_walker *walker)
178 struct dsmark_qdisc_data *p = PRIV(sch);
179 int i;
181 DPRINTK("dsmark_walk(sch %p,[qdisc %p],walker %p)\n", sch, p, walker);
183 if (walker->stop)
184 return;
186 for (i = 0; i < p->indices; i++) {
187 if (p->mask[i] == 0xff && !p->value[i])
188 goto ignore;
189 if (walker->count >= walker->skip) {
190 if (walker->fn(sch, i+1, walker) < 0) {
191 walker->stop = 1;
192 break;
195 ignore:
196 walker->count++;
200 static struct tcf_proto **dsmark_find_tcf(struct Qdisc *sch,unsigned long cl)
202 return &PRIV(sch)->filter_list;
205 /* --------------------------- Qdisc operations ---------------------------- */
207 static int dsmark_enqueue(struct sk_buff *skb,struct Qdisc *sch)
209 struct dsmark_qdisc_data *p = PRIV(sch);
210 int err;
212 D2PRINTK("dsmark_enqueue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p);
214 if (p->set_tc_index) {
215 /* FIXME: Safe with non-linear skbs? --RR */
216 switch (skb->protocol) {
217 case __constant_htons(ETH_P_IP):
218 skb->tc_index = ipv4_get_dsfield(ip_hdr(skb))
219 & ~INET_ECN_MASK;
220 break;
221 case __constant_htons(ETH_P_IPV6):
222 skb->tc_index = ipv6_get_dsfield(ipv6_hdr(skb))
223 & ~INET_ECN_MASK;
224 break;
225 default:
226 skb->tc_index = 0;
227 break;
231 if (TC_H_MAJ(skb->priority) == sch->handle)
232 skb->tc_index = TC_H_MIN(skb->priority);
233 else {
234 struct tcf_result res;
235 int result = tc_classify(skb, p->filter_list, &res);
237 D2PRINTK("result %d class 0x%04x\n", result, res.classid);
239 switch (result) {
240 #ifdef CONFIG_NET_CLS_ACT
241 case TC_ACT_QUEUED:
242 case TC_ACT_STOLEN:
243 kfree_skb(skb);
244 return NET_XMIT_SUCCESS;
245 case TC_ACT_SHOT:
246 kfree_skb(skb);
247 sch->qstats.drops++;
248 return NET_XMIT_BYPASS;
249 #endif
250 case TC_ACT_OK:
251 skb->tc_index = TC_H_MIN(res.classid);
252 break;
253 default:
254 if (p->default_index != NO_DEFAULT_INDEX)
255 skb->tc_index = p->default_index;
256 break;
260 err = p->q->enqueue(skb,p->q);
261 if (err != NET_XMIT_SUCCESS) {
262 sch->qstats.drops++;
263 return err;
266 sch->bstats.bytes += skb->len;
267 sch->bstats.packets++;
268 sch->q.qlen++;
270 return NET_XMIT_SUCCESS;
273 static struct sk_buff *dsmark_dequeue(struct Qdisc *sch)
275 struct dsmark_qdisc_data *p = PRIV(sch);
276 struct sk_buff *skb;
277 u32 index;
279 D2PRINTK("dsmark_dequeue(sch %p,[qdisc %p])\n", sch, p);
281 skb = p->q->ops->dequeue(p->q);
282 if (skb == NULL)
283 return NULL;
285 sch->q.qlen--;
287 index = skb->tc_index & (p->indices - 1);
288 D2PRINTK("index %d->%d\n", skb->tc_index, index);
290 switch (skb->protocol) {
291 case __constant_htons(ETH_P_IP):
292 ipv4_change_dsfield(ip_hdr(skb), p->mask[index],
293 p->value[index]);
294 break;
295 case __constant_htons(ETH_P_IPV6):
296 ipv6_change_dsfield(ipv6_hdr(skb), p->mask[index],
297 p->value[index]);
298 break;
299 default:
301 * Only complain if a change was actually attempted.
302 * This way, we can send non-IP traffic through dsmark
303 * and don't need yet another qdisc as a bypass.
305 if (p->mask[index] != 0xff || p->value[index])
306 printk(KERN_WARNING "dsmark_dequeue: "
307 "unsupported protocol %d\n",
308 ntohs(skb->protocol));
309 break;
312 return skb;
315 static int dsmark_requeue(struct sk_buff *skb,struct Qdisc *sch)
317 struct dsmark_qdisc_data *p = PRIV(sch);
318 int err;
320 D2PRINTK("dsmark_requeue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p);
322 err = p->q->ops->requeue(skb, p->q);
323 if (err != NET_XMIT_SUCCESS) {
324 sch->qstats.drops++;
325 return err;
328 sch->q.qlen++;
329 sch->qstats.requeues++;
331 return NET_XMIT_SUCCESS;
334 static unsigned int dsmark_drop(struct Qdisc *sch)
336 struct dsmark_qdisc_data *p = PRIV(sch);
337 unsigned int len;
339 DPRINTK("dsmark_reset(sch %p,[qdisc %p])\n", sch, p);
341 if (p->q->ops->drop == NULL)
342 return 0;
344 len = p->q->ops->drop(p->q);
345 if (len)
346 sch->q.qlen--;
348 return len;
351 static int dsmark_init(struct Qdisc *sch, struct rtattr *opt)
353 struct dsmark_qdisc_data *p = PRIV(sch);
354 struct rtattr *tb[TCA_DSMARK_MAX];
355 int err = -EINVAL;
356 u32 default_index = NO_DEFAULT_INDEX;
357 u16 indices;
358 u8 *mask;
360 DPRINTK("dsmark_init(sch %p,[qdisc %p],opt %p)\n", sch, p, opt);
362 if (!opt || rtattr_parse_nested(tb, TCA_DSMARK_MAX, opt) < 0)
363 goto errout;
365 indices = RTA_GET_U16(tb[TCA_DSMARK_INDICES-1]);
366 if (!indices || !dsmark_valid_indices(indices))
367 goto errout;
369 if (tb[TCA_DSMARK_DEFAULT_INDEX-1])
370 default_index = RTA_GET_U16(tb[TCA_DSMARK_DEFAULT_INDEX-1]);
372 mask = kmalloc(indices * 2, GFP_KERNEL);
373 if (mask == NULL) {
374 err = -ENOMEM;
375 goto errout;
378 p->mask = mask;
379 memset(p->mask, 0xff, indices);
381 p->value = p->mask + indices;
382 memset(p->value, 0, indices);
384 p->indices = indices;
385 p->default_index = default_index;
386 p->set_tc_index = RTA_GET_FLAG(tb[TCA_DSMARK_SET_TC_INDEX-1]);
388 p->q = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops, sch->handle);
389 if (p->q == NULL)
390 p->q = &noop_qdisc;
392 DPRINTK("dsmark_init: qdisc %p\n", p->q);
394 err = 0;
395 errout:
396 rtattr_failure:
397 return err;
400 static void dsmark_reset(struct Qdisc *sch)
402 struct dsmark_qdisc_data *p = PRIV(sch);
404 DPRINTK("dsmark_reset(sch %p,[qdisc %p])\n", sch, p);
405 qdisc_reset(p->q);
406 sch->q.qlen = 0;
409 static void dsmark_destroy(struct Qdisc *sch)
411 struct dsmark_qdisc_data *p = PRIV(sch);
413 DPRINTK("dsmark_destroy(sch %p,[qdisc %p])\n", sch, p);
415 tcf_destroy_chain(p->filter_list);
416 qdisc_destroy(p->q);
417 kfree(p->mask);
420 static int dsmark_dump_class(struct Qdisc *sch, unsigned long cl,
421 struct sk_buff *skb, struct tcmsg *tcm)
423 struct dsmark_qdisc_data *p = PRIV(sch);
424 struct rtattr *opts = NULL;
426 DPRINTK("dsmark_dump_class(sch %p,[qdisc %p],class %ld\n", sch, p, cl);
428 if (!dsmark_valid_index(p, cl))
429 return -EINVAL;
431 tcm->tcm_handle = TC_H_MAKE(TC_H_MAJ(sch->handle), cl-1);
432 tcm->tcm_info = p->q->handle;
434 opts = RTA_NEST(skb, TCA_OPTIONS);
435 RTA_PUT_U8(skb,TCA_DSMARK_MASK, p->mask[cl-1]);
436 RTA_PUT_U8(skb,TCA_DSMARK_VALUE, p->value[cl-1]);
438 return RTA_NEST_END(skb, opts);
440 rtattr_failure:
441 return RTA_NEST_CANCEL(skb, opts);
444 static int dsmark_dump(struct Qdisc *sch, struct sk_buff *skb)
446 struct dsmark_qdisc_data *p = PRIV(sch);
447 struct rtattr *opts = NULL;
449 opts = RTA_NEST(skb, TCA_OPTIONS);
450 RTA_PUT_U16(skb, TCA_DSMARK_INDICES, p->indices);
452 if (p->default_index != NO_DEFAULT_INDEX)
453 RTA_PUT_U16(skb, TCA_DSMARK_DEFAULT_INDEX, p->default_index);
455 if (p->set_tc_index)
456 RTA_PUT_FLAG(skb, TCA_DSMARK_SET_TC_INDEX);
458 return RTA_NEST_END(skb, opts);
460 rtattr_failure:
461 return RTA_NEST_CANCEL(skb, opts);
464 static struct Qdisc_class_ops dsmark_class_ops = {
465 .graft = dsmark_graft,
466 .leaf = dsmark_leaf,
467 .get = dsmark_get,
468 .put = dsmark_put,
469 .change = dsmark_change,
470 .delete = dsmark_delete,
471 .walk = dsmark_walk,
472 .tcf_chain = dsmark_find_tcf,
473 .bind_tcf = dsmark_bind_filter,
474 .unbind_tcf = dsmark_put,
475 .dump = dsmark_dump_class,
478 static struct Qdisc_ops dsmark_qdisc_ops = {
479 .next = NULL,
480 .cl_ops = &dsmark_class_ops,
481 .id = "dsmark",
482 .priv_size = sizeof(struct dsmark_qdisc_data),
483 .enqueue = dsmark_enqueue,
484 .dequeue = dsmark_dequeue,
485 .requeue = dsmark_requeue,
486 .drop = dsmark_drop,
487 .init = dsmark_init,
488 .reset = dsmark_reset,
489 .destroy = dsmark_destroy,
490 .change = NULL,
491 .dump = dsmark_dump,
492 .owner = THIS_MODULE,
495 static int __init dsmark_module_init(void)
497 return register_qdisc(&dsmark_qdisc_ops);
500 static void __exit dsmark_module_exit(void)
502 unregister_qdisc(&dsmark_qdisc_ops);
505 module_init(dsmark_module_init)
506 module_exit(dsmark_module_exit)
508 MODULE_LICENSE("GPL");