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19#include <linux/module.h>
20#include <linux/slab.h>
21#include <linux/types.h>
22#include <linux/kernel.h>
23#include <linux/string.h>
24#include <linux/errno.h>
25#include <linux/skbuff.h>
26#include <net/netlink.h>
27#include <net/pkt_sched.h>
28
29
30struct multiq_sched_data {
31 u16 bands;
32 u16 max_bands;
33 u16 curband;
34 struct tcf_proto __rcu *filter_list;
35 struct Qdisc **queues;
36};
37
38
39static struct Qdisc *
40multiq_classify(struct sk_buff *skb, struct Qdisc *sch, int *qerr)
41{
42 struct multiq_sched_data *q = qdisc_priv(sch);
43 u32 band;
44 struct tcf_result res;
45 struct tcf_proto *fl = rcu_dereference_bh(q->filter_list);
46 int err;
47
48 *qerr = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
49 err = tc_classify(skb, fl, &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 qdisc_qstats_drop(sch);
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 qdisc_qstats_drop(sch);
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_xmit_stopped(
111 netdev_get_tx_queue(qdisc_dev(sch), q->curband))) {
112 qdisc = q->queues[q->curband];
113 skb = qdisc->dequeue(qdisc);
114 if (skb) {
115 qdisc_bstats_update(sch, skb);
116 sch->q.qlen--;
117 return skb;
118 }
119 }
120 }
121 return NULL;
122
123}
124
125static struct sk_buff *multiq_peek(struct Qdisc *sch)
126{
127 struct multiq_sched_data *q = qdisc_priv(sch);
128 unsigned int curband = q->curband;
129 struct Qdisc *qdisc;
130 struct sk_buff *skb;
131 int band;
132
133 for (band = 0; band < q->bands; band++) {
134
135 curband++;
136 if (curband >= q->bands)
137 curband = 0;
138
139
140
141
142 if (!netif_xmit_stopped(
143 netdev_get_tx_queue(qdisc_dev(sch), curband))) {
144 qdisc = q->queues[curband];
145 skb = qdisc->ops->peek(qdisc);
146 if (skb)
147 return skb;
148 }
149 }
150 return NULL;
151
152}
153
154static unsigned int multiq_drop(struct Qdisc *sch)
155{
156 struct multiq_sched_data *q = qdisc_priv(sch);
157 int band;
158 unsigned int len;
159 struct Qdisc *qdisc;
160
161 for (band = q->bands - 1; band >= 0; band--) {
162 qdisc = q->queues[band];
163 if (qdisc->ops->drop) {
164 len = qdisc->ops->drop(qdisc);
165 if (len != 0) {
166 sch->q.qlen--;
167 return len;
168 }
169 }
170 }
171 return 0;
172}
173
174
175static void
176multiq_reset(struct Qdisc *sch)
177{
178 u16 band;
179 struct multiq_sched_data *q = qdisc_priv(sch);
180
181 for (band = 0; band < q->bands; band++)
182 qdisc_reset(q->queues[band]);
183 sch->q.qlen = 0;
184 q->curband = 0;
185}
186
187static void
188multiq_destroy(struct Qdisc *sch)
189{
190 int band;
191 struct multiq_sched_data *q = qdisc_priv(sch);
192
193 tcf_destroy_chain(&q->filter_list);
194 for (band = 0; band < q->bands; band++)
195 qdisc_destroy(q->queues[band]);
196
197 kfree(q->queues);
198}
199
200static int multiq_tune(struct Qdisc *sch, struct nlattr *opt)
201{
202 struct multiq_sched_data *q = qdisc_priv(sch);
203 struct tc_multiq_qopt *qopt;
204 int i;
205
206 if (!netif_is_multiqueue(qdisc_dev(sch)))
207 return -EOPNOTSUPP;
208 if (nla_len(opt) < sizeof(*qopt))
209 return -EINVAL;
210
211 qopt = nla_data(opt);
212
213 qopt->bands = qdisc_dev(sch)->real_num_tx_queues;
214
215 sch_tree_lock(sch);
216 q->bands = qopt->bands;
217 for (i = q->bands; i < q->max_bands; i++) {
218 if (q->queues[i] != &noop_qdisc) {
219 struct Qdisc *child = q->queues[i];
220 q->queues[i] = &noop_qdisc;
221 qdisc_tree_decrease_qlen(child, child->q.qlen);
222 qdisc_destroy(child);
223 }
224 }
225
226 sch_tree_unlock(sch);
227
228 for (i = 0; i < q->bands; i++) {
229 if (q->queues[i] == &noop_qdisc) {
230 struct Qdisc *child, *old;
231 child = qdisc_create_dflt(sch->dev_queue,
232 &pfifo_qdisc_ops,
233 TC_H_MAKE(sch->handle,
234 i + 1));
235 if (child) {
236 sch_tree_lock(sch);
237 old = q->queues[i];
238 q->queues[i] = child;
239
240 if (old != &noop_qdisc) {
241 qdisc_tree_decrease_qlen(old,
242 old->q.qlen);
243 qdisc_destroy(old);
244 }
245 sch_tree_unlock(sch);
246 }
247 }
248 }
249 return 0;
250}
251
252static int multiq_init(struct Qdisc *sch, struct nlattr *opt)
253{
254 struct multiq_sched_data *q = qdisc_priv(sch);
255 int i, err;
256
257 q->queues = NULL;
258
259 if (opt == NULL)
260 return -EINVAL;
261
262 q->max_bands = qdisc_dev(sch)->num_tx_queues;
263
264 q->queues = kcalloc(q->max_bands, sizeof(struct Qdisc *), GFP_KERNEL);
265 if (!q->queues)
266 return -ENOBUFS;
267 for (i = 0; i < q->max_bands; i++)
268 q->queues[i] = &noop_qdisc;
269
270 err = multiq_tune(sch, opt);
271
272 if (err)
273 kfree(q->queues);
274
275 return err;
276}
277
278static int multiq_dump(struct Qdisc *sch, struct sk_buff *skb)
279{
280 struct multiq_sched_data *q = qdisc_priv(sch);
281 unsigned char *b = skb_tail_pointer(skb);
282 struct tc_multiq_qopt opt;
283
284 opt.bands = q->bands;
285 opt.max_bands = q->max_bands;
286
287 if (nla_put(skb, TCA_OPTIONS, sizeof(opt), &opt))
288 goto nla_put_failure;
289
290 return skb->len;
291
292nla_put_failure:
293 nlmsg_trim(skb, b);
294 return -1;
295}
296
297static int multiq_graft(struct Qdisc *sch, unsigned long arg, struct Qdisc *new,
298 struct Qdisc **old)
299{
300 struct multiq_sched_data *q = qdisc_priv(sch);
301 unsigned long band = arg - 1;
302
303 if (new == NULL)
304 new = &noop_qdisc;
305
306 sch_tree_lock(sch);
307 *old = q->queues[band];
308 q->queues[band] = new;
309 qdisc_tree_decrease_qlen(*old, (*old)->q.qlen);
310 qdisc_reset(*old);
311 sch_tree_unlock(sch);
312
313 return 0;
314}
315
316static struct Qdisc *
317multiq_leaf(struct Qdisc *sch, unsigned long arg)
318{
319 struct multiq_sched_data *q = qdisc_priv(sch);
320 unsigned long band = arg - 1;
321
322 return q->queues[band];
323}
324
325static unsigned long multiq_get(struct Qdisc *sch, u32 classid)
326{
327 struct multiq_sched_data *q = qdisc_priv(sch);
328 unsigned long band = TC_H_MIN(classid);
329
330 if (band - 1 >= q->bands)
331 return 0;
332 return band;
333}
334
335static unsigned long multiq_bind(struct Qdisc *sch, unsigned long parent,
336 u32 classid)
337{
338 return multiq_get(sch, classid);
339}
340
341
342static void multiq_put(struct Qdisc *q, unsigned long cl)
343{
344}
345
346static int multiq_dump_class(struct Qdisc *sch, unsigned long cl,
347 struct sk_buff *skb, struct tcmsg *tcm)
348{
349 struct multiq_sched_data *q = qdisc_priv(sch);
350
351 tcm->tcm_handle |= TC_H_MIN(cl);
352 tcm->tcm_info = q->queues[cl - 1]->handle;
353 return 0;
354}
355
356static int multiq_dump_class_stats(struct Qdisc *sch, unsigned long cl,
357 struct gnet_dump *d)
358{
359 struct multiq_sched_data *q = qdisc_priv(sch);
360 struct Qdisc *cl_q;
361
362 cl_q = q->queues[cl - 1];
363 if (gnet_stats_copy_basic(d, NULL, &cl_q->bstats) < 0 ||
364 gnet_stats_copy_queue(d, NULL, &cl_q->qstats, cl_q->q.qlen) < 0)
365 return -1;
366
367 return 0;
368}
369
370static void multiq_walk(struct Qdisc *sch, struct qdisc_walker *arg)
371{
372 struct multiq_sched_data *q = qdisc_priv(sch);
373 int band;
374
375 if (arg->stop)
376 return;
377
378 for (band = 0; band < q->bands; band++) {
379 if (arg->count < arg->skip) {
380 arg->count++;
381 continue;
382 }
383 if (arg->fn(sch, band + 1, arg) < 0) {
384 arg->stop = 1;
385 break;
386 }
387 arg->count++;
388 }
389}
390
391static struct tcf_proto __rcu **multiq_find_tcf(struct Qdisc *sch,
392 unsigned long cl)
393{
394 struct multiq_sched_data *q = qdisc_priv(sch);
395
396 if (cl)
397 return NULL;
398 return &q->filter_list;
399}
400
401static const struct Qdisc_class_ops multiq_class_ops = {
402 .graft = multiq_graft,
403 .leaf = multiq_leaf,
404 .get = multiq_get,
405 .put = multiq_put,
406 .walk = multiq_walk,
407 .tcf_chain = multiq_find_tcf,
408 .bind_tcf = multiq_bind,
409 .unbind_tcf = multiq_put,
410 .dump = multiq_dump_class,
411 .dump_stats = multiq_dump_class_stats,
412};
413
414static struct Qdisc_ops multiq_qdisc_ops __read_mostly = {
415 .next = NULL,
416 .cl_ops = &multiq_class_ops,
417 .id = "multiq",
418 .priv_size = sizeof(struct multiq_sched_data),
419 .enqueue = multiq_enqueue,
420 .dequeue = multiq_dequeue,
421 .peek = multiq_peek,
422 .drop = multiq_drop,
423 .init = multiq_init,
424 .reset = multiq_reset,
425 .destroy = multiq_destroy,
426 .change = multiq_tune,
427 .dump = multiq_dump,
428 .owner = THIS_MODULE,
429};
430
431static int __init multiq_module_init(void)
432{
433 return register_qdisc(&multiq_qdisc_ops);
434}
435
436static void __exit multiq_module_exit(void)
437{
438 unregister_qdisc(&multiq_qdisc_ops);
439}
440
441module_init(multiq_module_init)
442module_exit(multiq_module_exit)
443
444MODULE_LICENSE("GPL");
445
