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20#include <linux/module.h>
21#include <linux/slab.h>
22#include <linux/types.h>
23#include <linux/kernel.h>
24#include <linux/string.h>
25#include <linux/errno.h>
26#include <linux/skbuff.h>
27#include <net/netlink.h>
28#include <net/pkt_sched.h>
29
30
31struct multiq_sched_data {
32 u16 bands;
33 u16 max_bands;
34 u16 curband;
35 struct tcf_proto *filter_list;
36 struct Qdisc **queues;
37};
38
39
40static struct Qdisc *
41multiq_classify(struct sk_buff *skb, struct Qdisc *sch, int *qerr)
42{
43 struct multiq_sched_data *q = qdisc_priv(sch);
44 u32 band;
45 struct tcf_result res;
46 int err;
47
48 *qerr = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
49 err = tc_classify(skb, q->filter_list, &res);
50#ifdef CONFIG_NET_CLS_ACT
51 switch (err) {
52 case TC_ACT_STOLEN:
53 case TC_ACT_QUEUED:
54 *qerr = NET_XMIT_SUCCESS | __NET_XMIT_STOLEN;
55 case TC_ACT_SHOT:
56 return NULL;
57 }
58#endif
59 band = skb_get_queue_mapping(skb);
60
61 if (band >= q->bands)
62 return q->queues[0];
63
64 return q->queues[band];
65}
66
67static int
68multiq_enqueue(struct sk_buff *skb, struct Qdisc *sch)
69{
70 struct Qdisc *qdisc;
71 int ret;
72
73 qdisc = multiq_classify(skb, sch, &ret);
74#ifdef CONFIG_NET_CLS_ACT
75 if (qdisc == NULL) {
76
77 if (ret & __NET_XMIT_BYPASS)
78 sch->qstats.drops++;
79 kfree_skb(skb);
80 return ret;
81 }
82#endif
83
84 ret = qdisc_enqueue(skb, qdisc);
85 if (ret == NET_XMIT_SUCCESS) {
86 sch->q.qlen++;
87 return NET_XMIT_SUCCESS;
88 }
89 if (net_xmit_drop_count(ret))
90 sch->qstats.drops++;
91 return ret;
92}
93
94static struct sk_buff *multiq_dequeue(struct Qdisc *sch)
95{
96 struct multiq_sched_data *q = qdisc_priv(sch);
97 struct Qdisc *qdisc;
98 struct sk_buff *skb;
99 int band;
100
101 for (band = 0; band < q->bands; band++) {
102
103 q->curband++;
104 if (q->curband >= q->bands)
105 q->curband = 0;
106
107
108
109
110 if (!__netif_subqueue_stopped(qdisc_dev(sch), q->curband)) {
111 qdisc = q->queues[q->curband];
112 skb = qdisc->dequeue(qdisc);
113 if (skb) {
114 qdisc_bstats_update(sch, skb);
115 sch->q.qlen--;
116 return skb;
117 }
118 }
119 }
120 return NULL;
121
122}
123
124static struct sk_buff *multiq_peek(struct Qdisc *sch)
125{
126 struct multiq_sched_data *q = qdisc_priv(sch);
127 unsigned int curband = q->curband;
128 struct Qdisc *qdisc;
129 struct sk_buff *skb;
130 int band;
131
132 for (band = 0; band < q->bands; band++) {
133
134 curband++;
135 if (curband >= q->bands)
136 curband = 0;
137
138
139
140
141 if (!__netif_subqueue_stopped(qdisc_dev(sch), curband)) {
142 qdisc = q->queues[curband];
143 skb = qdisc->ops->peek(qdisc);
144 if (skb)
145 return skb;
146 }
147 }
148 return NULL;
149
150}
151
152static unsigned int multiq_drop(struct Qdisc *sch)
153{
154 struct multiq_sched_data *q = qdisc_priv(sch);
155 int band;
156 unsigned int len;
157 struct Qdisc *qdisc;
158
159 for (band = q->bands-1; band >= 0; band--) {
160 qdisc = q->queues[band];
161 if (qdisc->ops->drop) {
162 len = qdisc->ops->drop(qdisc);
163 if (len != 0) {
164 sch->q.qlen--;
165 return len;
166 }
167 }
168 }
169 return 0;
170}
171
172
173static void
174multiq_reset(struct Qdisc *sch)
175{
176 u16 band;
177 struct multiq_sched_data *q = qdisc_priv(sch);
178
179 for (band = 0; band < q->bands; band++)
180 qdisc_reset(q->queues[band]);
181 sch->q.qlen = 0;
182 q->curband = 0;
183}
184
185static void
186multiq_destroy(struct Qdisc *sch)
187{
188 int band;
189 struct multiq_sched_data *q = qdisc_priv(sch);
190
191 tcf_destroy_chain(&q->filter_list);
192 for (band = 0; band < q->bands; band++)
193 qdisc_destroy(q->queues[band]);
194
195 kfree(q->queues);
196}
197
198static int multiq_tune(struct Qdisc *sch, struct nlattr *opt)
199{
200 struct multiq_sched_data *q = qdisc_priv(sch);
201 struct tc_multiq_qopt *qopt;
202 int i;
203
204 if (!netif_is_multiqueue(qdisc_dev(sch)))
205 return -EOPNOTSUPP;
206 if (nla_len(opt) < sizeof(*qopt))
207 return -EINVAL;
208
209 qopt = nla_data(opt);
210
211 qopt->bands = qdisc_dev(sch)->real_num_tx_queues;
212
213 sch_tree_lock(sch);
214 q->bands = qopt->bands;
215 for (i = q->bands; i < q->max_bands; i++) {
216 if (q->queues[i] != &noop_qdisc) {
217 struct Qdisc *child = q->queues[i];
218 q->queues[i] = &noop_qdisc;
219 qdisc_tree_decrease_qlen(child, child->q.qlen);
220 qdisc_destroy(child);
221 }
222 }
223
224 sch_tree_unlock(sch);
225
226 for (i = 0; i < q->bands; i++) {
227 if (q->queues[i] == &noop_qdisc) {
228 struct Qdisc *child, *old;
229 child = qdisc_create_dflt(sch->dev_queue,
230 &pfifo_qdisc_ops,
231 TC_H_MAKE(sch->handle,
232 i + 1));
233 if (child) {
234 sch_tree_lock(sch);
235 old = q->queues[i];
236 q->queues[i] = child;
237
238 if (old != &noop_qdisc) {
239 qdisc_tree_decrease_qlen(old,
240 old->q.qlen);
241 qdisc_destroy(old);
242 }
243 sch_tree_unlock(sch);
244 }
245 }
246 }
247 return 0;
248}
249
250static int multiq_init(struct Qdisc *sch, struct nlattr *opt)
251{
252 struct multiq_sched_data *q = qdisc_priv(sch);
253 int i, err;
254
255 q->queues = NULL;
256
257 if (opt == NULL)
258 return -EINVAL;
259
260 q->max_bands = qdisc_dev(sch)->num_tx_queues;
261
262 q->queues = kcalloc(q->max_bands, sizeof(struct Qdisc *), GFP_KERNEL);
263 if (!q->queues)
264 return -ENOBUFS;
265 for (i = 0; i < q->max_bands; i++)
266 q->queues[i] = &noop_qdisc;
267
268 err = multiq_tune(sch,opt);
269
270 if (err)
271 kfree(q->queues);
272
273 return err;
274}
275
276static int multiq_dump(struct Qdisc *sch, struct sk_buff *skb)
277{
278 struct multiq_sched_data *q = qdisc_priv(sch);
279 unsigned char *b = skb_tail_pointer(skb);
280 struct tc_multiq_qopt opt;
281
282 opt.bands = q->bands;
283 opt.max_bands = q->max_bands;
284
285 NLA_PUT(skb, TCA_OPTIONS, sizeof(opt), &opt);
286
287 return skb->len;
288
289nla_put_failure:
290 nlmsg_trim(skb, b);
291 return -1;
292}
293
294static int multiq_graft(struct Qdisc *sch, unsigned long arg, struct Qdisc *new,
295 struct Qdisc **old)
296{
297 struct multiq_sched_data *q = qdisc_priv(sch);
298 unsigned long band = arg - 1;
299
300 if (new == NULL)
301 new = &noop_qdisc;
302
303 sch_tree_lock(sch);
304 *old = q->queues[band];
305 q->queues[band] = new;
306 qdisc_tree_decrease_qlen(*old, (*old)->q.qlen);
307 qdisc_reset(*old);
308 sch_tree_unlock(sch);
309
310 return 0;
311}
312
313static struct Qdisc *
314multiq_leaf(struct Qdisc *sch, unsigned long arg)
315{
316 struct multiq_sched_data *q = qdisc_priv(sch);
317 unsigned long band = arg - 1;
318
319 return q->queues[band];
320}
321
322static unsigned long multiq_get(struct Qdisc *sch, u32 classid)
323{
324 struct multiq_sched_data *q = qdisc_priv(sch);
325 unsigned long band = TC_H_MIN(classid);
326
327 if (band - 1 >= q->bands)
328 return 0;
329 return band;
330}
331
332static unsigned long multiq_bind(struct Qdisc *sch, unsigned long parent,
333 u32 classid)
334{
335 return multiq_get(sch, classid);
336}
337
338
339static void multiq_put(struct Qdisc *q, unsigned long cl)
340{
341}
342
343static int multiq_dump_class(struct Qdisc *sch, unsigned long cl,
344 struct sk_buff *skb, struct tcmsg *tcm)
345{
346 struct multiq_sched_data *q = qdisc_priv(sch);
347
348 tcm->tcm_handle |= TC_H_MIN(cl);
349 tcm->tcm_info = q->queues[cl-1]->handle;
350 return 0;
351}
352
353static int multiq_dump_class_stats(struct Qdisc *sch, unsigned long cl,
354 struct gnet_dump *d)
355{
356 struct multiq_sched_data *q = qdisc_priv(sch);
357 struct Qdisc *cl_q;
358
359 cl_q = q->queues[cl - 1];
360 cl_q->qstats.qlen = cl_q->q.qlen;
361 if (gnet_stats_copy_basic(d, &cl_q->bstats) < 0 ||
362 gnet_stats_copy_queue(d, &cl_q->qstats) < 0)
363 return -1;
364
365 return 0;
366}
367
368static void multiq_walk(struct Qdisc *sch, struct qdisc_walker *arg)
369{
370 struct multiq_sched_data *q = qdisc_priv(sch);
371 int band;
372
373 if (arg->stop)
374 return;
375
376 for (band = 0; band < q->bands; band++) {
377 if (arg->count < arg->skip) {
378 arg->count++;
379 continue;
380 }
381 if (arg->fn(sch, band+1, arg) < 0) {
382 arg->stop = 1;
383 break;
384 }
385 arg->count++;
386 }
387}
388
389static struct tcf_proto **multiq_find_tcf(struct Qdisc *sch, unsigned long cl)
390{
391 struct multiq_sched_data *q = qdisc_priv(sch);
392
393 if (cl)
394 return NULL;
395 return &q->filter_list;
396}
397
398static const struct Qdisc_class_ops multiq_class_ops = {
399 .graft = multiq_graft,
400 .leaf = multiq_leaf,
401 .get = multiq_get,
402 .put = multiq_put,
403 .walk = multiq_walk,
404 .tcf_chain = multiq_find_tcf,
405 .bind_tcf = multiq_bind,
406 .unbind_tcf = multiq_put,
407 .dump = multiq_dump_class,
408 .dump_stats = multiq_dump_class_stats,
409};
410
411static struct Qdisc_ops multiq_qdisc_ops __read_mostly = {
412 .next = NULL,
413 .cl_ops = &multiq_class_ops,
414 .id = "multiq",
415 .priv_size = sizeof(struct multiq_sched_data),
416 .enqueue = multiq_enqueue,
417 .dequeue = multiq_dequeue,
418 .peek = multiq_peek,
419 .drop = multiq_drop,
420 .init = multiq_init,
421 .reset = multiq_reset,
422 .destroy = multiq_destroy,
423 .change = multiq_tune,
424 .dump = multiq_dump,
425 .owner = THIS_MODULE,
426};
427
428static int __init multiq_module_init(void)
429{
430 return register_qdisc(&multiq_qdisc_ops);
431}
432
433static void __exit multiq_module_exit(void)
434{
435 unregister_qdisc(&multiq_qdisc_ops);
436}
437
438module_init(multiq_module_init)
439module_exit(multiq_module_exit)
440
441MODULE_LICENSE("GPL");
442
