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9952f691 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
92651940 AD |
2 | /* |
3 | * Copyright (c) 2008, Intel Corporation. | |
4 | * | |
92651940 AD |
5 | * Author: Alexander Duyck <alexander.h.duyck@intel.com> |
6 | */ | |
7 | ||
8 | #include <linux/module.h> | |
5a0e3ad6 | 9 | #include <linux/slab.h> |
92651940 AD |
10 | #include <linux/types.h> |
11 | #include <linux/kernel.h> | |
12 | #include <linux/string.h> | |
13 | #include <linux/errno.h> | |
14 | #include <linux/skbuff.h> | |
15 | #include <net/netlink.h> | |
16 | #include <net/pkt_sched.h> | |
cf1facda | 17 | #include <net/pkt_cls.h> |
92651940 AD |
18 | |
19 | struct multiq_sched_data { | |
20 | u16 bands; | |
21 | u16 max_bands; | |
22 | u16 curband; | |
25d8c0d5 | 23 | struct tcf_proto __rcu *filter_list; |
6529eaba | 24 | struct tcf_block *block; |
92651940 AD |
25 | struct Qdisc **queues; |
26 | }; | |
27 | ||
28 | ||
29 | static struct Qdisc * | |
30 | multiq_classify(struct sk_buff *skb, struct Qdisc *sch, int *qerr) | |
31 | { | |
32 | struct multiq_sched_data *q = qdisc_priv(sch); | |
33 | u32 band; | |
34 | struct tcf_result res; | |
25d8c0d5 | 35 | struct tcf_proto *fl = rcu_dereference_bh(q->filter_list); |
92651940 AD |
36 | int err; |
37 | ||
38 | *qerr = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS; | |
87d83093 | 39 | err = tcf_classify(skb, fl, &res, false); |
92651940 AD |
40 | #ifdef CONFIG_NET_CLS_ACT |
41 | switch (err) { | |
42 | case TC_ACT_STOLEN: | |
43 | case TC_ACT_QUEUED: | |
e25ea21f | 44 | case TC_ACT_TRAP: |
92651940 | 45 | *qerr = NET_XMIT_SUCCESS | __NET_XMIT_STOLEN; |
f3ae608e | 46 | /* fall through */ |
92651940 AD |
47 | case TC_ACT_SHOT: |
48 | return NULL; | |
49 | } | |
50 | #endif | |
51 | band = skb_get_queue_mapping(skb); | |
52 | ||
53 | if (band >= q->bands) | |
54 | return q->queues[0]; | |
55 | ||
56 | return q->queues[band]; | |
57 | } | |
58 | ||
59 | static int | |
520ac30f ED |
60 | multiq_enqueue(struct sk_buff *skb, struct Qdisc *sch, |
61 | struct sk_buff **to_free) | |
92651940 AD |
62 | { |
63 | struct Qdisc *qdisc; | |
64 | int ret; | |
65 | ||
66 | qdisc = multiq_classify(skb, sch, &ret); | |
67 | #ifdef CONFIG_NET_CLS_ACT | |
68 | if (qdisc == NULL) { | |
69 | ||
70 | if (ret & __NET_XMIT_BYPASS) | |
25331d6c | 71 | qdisc_qstats_drop(sch); |
520ac30f | 72 | __qdisc_drop(skb, to_free); |
92651940 AD |
73 | return ret; |
74 | } | |
75 | #endif | |
76 | ||
520ac30f | 77 | ret = qdisc_enqueue(skb, qdisc, to_free); |
92651940 | 78 | if (ret == NET_XMIT_SUCCESS) { |
92651940 AD |
79 | sch->q.qlen++; |
80 | return NET_XMIT_SUCCESS; | |
81 | } | |
82 | if (net_xmit_drop_count(ret)) | |
25331d6c | 83 | qdisc_qstats_drop(sch); |
92651940 AD |
84 | return ret; |
85 | } | |
86 | ||
92651940 AD |
87 | static struct sk_buff *multiq_dequeue(struct Qdisc *sch) |
88 | { | |
89 | struct multiq_sched_data *q = qdisc_priv(sch); | |
90 | struct Qdisc *qdisc; | |
91 | struct sk_buff *skb; | |
92 | int band; | |
93 | ||
94 | for (band = 0; band < q->bands; band++) { | |
95 | /* cycle through bands to ensure fairness */ | |
96 | q->curband++; | |
97 | if (q->curband >= q->bands) | |
98 | q->curband = 0; | |
99 | ||
100 | /* Check that target subqueue is available before | |
f30ab418 | 101 | * pulling an skb to avoid head-of-line blocking. |
92651940 | 102 | */ |
73466498 TH |
103 | if (!netif_xmit_stopped( |
104 | netdev_get_tx_queue(qdisc_dev(sch), q->curband))) { | |
92651940 AD |
105 | qdisc = q->queues[q->curband]; |
106 | skb = qdisc->dequeue(qdisc); | |
107 | if (skb) { | |
9190b3b3 | 108 | qdisc_bstats_update(sch, skb); |
92651940 AD |
109 | sch->q.qlen--; |
110 | return skb; | |
111 | } | |
112 | } | |
113 | } | |
114 | return NULL; | |
115 | ||
116 | } | |
117 | ||
8e3af978 JP |
118 | static struct sk_buff *multiq_peek(struct Qdisc *sch) |
119 | { | |
120 | struct multiq_sched_data *q = qdisc_priv(sch); | |
121 | unsigned int curband = q->curband; | |
122 | struct Qdisc *qdisc; | |
123 | struct sk_buff *skb; | |
124 | int band; | |
125 | ||
126 | for (band = 0; band < q->bands; band++) { | |
127 | /* cycle through bands to ensure fairness */ | |
128 | curband++; | |
129 | if (curband >= q->bands) | |
130 | curband = 0; | |
131 | ||
132 | /* Check that target subqueue is available before | |
f30ab418 | 133 | * pulling an skb to avoid head-of-line blocking. |
8e3af978 | 134 | */ |
73466498 TH |
135 | if (!netif_xmit_stopped( |
136 | netdev_get_tx_queue(qdisc_dev(sch), curband))) { | |
8e3af978 JP |
137 | qdisc = q->queues[curband]; |
138 | skb = qdisc->ops->peek(qdisc); | |
139 | if (skb) | |
140 | return skb; | |
141 | } | |
142 | } | |
143 | return NULL; | |
144 | ||
145 | } | |
146 | ||
92651940 AD |
147 | static void |
148 | multiq_reset(struct Qdisc *sch) | |
149 | { | |
150 | u16 band; | |
151 | struct multiq_sched_data *q = qdisc_priv(sch); | |
152 | ||
153 | for (band = 0; band < q->bands; band++) | |
154 | qdisc_reset(q->queues[band]); | |
155 | sch->q.qlen = 0; | |
156 | q->curband = 0; | |
157 | } | |
158 | ||
159 | static void | |
160 | multiq_destroy(struct Qdisc *sch) | |
161 | { | |
162 | int band; | |
163 | struct multiq_sched_data *q = qdisc_priv(sch); | |
164 | ||
6529eaba | 165 | tcf_block_put(q->block); |
92651940 | 166 | for (band = 0; band < q->bands; band++) |
86bd446b | 167 | qdisc_put(q->queues[band]); |
92651940 AD |
168 | |
169 | kfree(q->queues); | |
170 | } | |
171 | ||
2030721c AA |
172 | static int multiq_tune(struct Qdisc *sch, struct nlattr *opt, |
173 | struct netlink_ext_ack *extack) | |
92651940 AD |
174 | { |
175 | struct multiq_sched_data *q = qdisc_priv(sch); | |
176 | struct tc_multiq_qopt *qopt; | |
177 | int i; | |
178 | ||
179 | if (!netif_is_multiqueue(qdisc_dev(sch))) | |
149490f1 | 180 | return -EOPNOTSUPP; |
92651940 AD |
181 | if (nla_len(opt) < sizeof(*qopt)) |
182 | return -EINVAL; | |
183 | ||
184 | qopt = nla_data(opt); | |
185 | ||
186 | qopt->bands = qdisc_dev(sch)->real_num_tx_queues; | |
187 | ||
188 | sch_tree_lock(sch); | |
189 | q->bands = qopt->bands; | |
190 | for (i = q->bands; i < q->max_bands; i++) { | |
f07d1501 | 191 | if (q->queues[i] != &noop_qdisc) { |
b94c8afc | 192 | struct Qdisc *child = q->queues[i]; |
e5f0e8f8 | 193 | |
b94c8afc | 194 | q->queues[i] = &noop_qdisc; |
e5f0e8f8 | 195 | qdisc_tree_flush_backlog(child); |
86bd446b | 196 | qdisc_put(child); |
92651940 AD |
197 | } |
198 | } | |
199 | ||
200 | sch_tree_unlock(sch); | |
201 | ||
202 | for (i = 0; i < q->bands; i++) { | |
203 | if (q->queues[i] == &noop_qdisc) { | |
b94c8afc | 204 | struct Qdisc *child, *old; |
3511c913 | 205 | child = qdisc_create_dflt(sch->dev_queue, |
92651940 AD |
206 | &pfifo_qdisc_ops, |
207 | TC_H_MAKE(sch->handle, | |
a38a9882 | 208 | i + 1), extack); |
92651940 AD |
209 | if (child) { |
210 | sch_tree_lock(sch); | |
b94c8afc PM |
211 | old = q->queues[i]; |
212 | q->queues[i] = child; | |
49b49971 JK |
213 | if (child != &noop_qdisc) |
214 | qdisc_hash_add(child, true); | |
92651940 | 215 | |
b94c8afc | 216 | if (old != &noop_qdisc) { |
e5f0e8f8 | 217 | qdisc_tree_flush_backlog(old); |
86bd446b | 218 | qdisc_put(old); |
92651940 AD |
219 | } |
220 | sch_tree_unlock(sch); | |
221 | } | |
222 | } | |
223 | } | |
224 | return 0; | |
225 | } | |
226 | ||
e63d7dfd AA |
227 | static int multiq_init(struct Qdisc *sch, struct nlattr *opt, |
228 | struct netlink_ext_ack *extack) | |
92651940 AD |
229 | { |
230 | struct multiq_sched_data *q = qdisc_priv(sch); | |
f07d1501 | 231 | int i, err; |
92651940 AD |
232 | |
233 | q->queues = NULL; | |
234 | ||
ac8ef4ab | 235 | if (!opt) |
92651940 AD |
236 | return -EINVAL; |
237 | ||
8d1a77f9 | 238 | err = tcf_block_get(&q->block, &q->filter_list, sch, extack); |
6529eaba JP |
239 | if (err) |
240 | return err; | |
241 | ||
92651940 AD |
242 | q->max_bands = qdisc_dev(sch)->num_tx_queues; |
243 | ||
244 | q->queues = kcalloc(q->max_bands, sizeof(struct Qdisc *), GFP_KERNEL); | |
245 | if (!q->queues) | |
246 | return -ENOBUFS; | |
247 | for (i = 0; i < q->max_bands; i++) | |
248 | q->queues[i] = &noop_qdisc; | |
249 | ||
2030721c | 250 | return multiq_tune(sch, opt, extack); |
92651940 AD |
251 | } |
252 | ||
253 | static int multiq_dump(struct Qdisc *sch, struct sk_buff *skb) | |
254 | { | |
255 | struct multiq_sched_data *q = qdisc_priv(sch); | |
256 | unsigned char *b = skb_tail_pointer(skb); | |
257 | struct tc_multiq_qopt opt; | |
258 | ||
259 | opt.bands = q->bands; | |
260 | opt.max_bands = q->max_bands; | |
261 | ||
1b34ec43 DM |
262 | if (nla_put(skb, TCA_OPTIONS, sizeof(opt), &opt)) |
263 | goto nla_put_failure; | |
92651940 AD |
264 | |
265 | return skb->len; | |
266 | ||
267 | nla_put_failure: | |
268 | nlmsg_trim(skb, b); | |
269 | return -1; | |
270 | } | |
271 | ||
272 | static int multiq_graft(struct Qdisc *sch, unsigned long arg, struct Qdisc *new, | |
653d6fd6 | 273 | struct Qdisc **old, struct netlink_ext_ack *extack) |
92651940 AD |
274 | { |
275 | struct multiq_sched_data *q = qdisc_priv(sch); | |
276 | unsigned long band = arg - 1; | |
277 | ||
92651940 AD |
278 | if (new == NULL) |
279 | new = &noop_qdisc; | |
280 | ||
86a7996c | 281 | *old = qdisc_replace(sch, new, &q->queues[band]); |
92651940 AD |
282 | return 0; |
283 | } | |
284 | ||
285 | static struct Qdisc * | |
286 | multiq_leaf(struct Qdisc *sch, unsigned long arg) | |
287 | { | |
288 | struct multiq_sched_data *q = qdisc_priv(sch); | |
289 | unsigned long band = arg - 1; | |
290 | ||
92651940 AD |
291 | return q->queues[band]; |
292 | } | |
293 | ||
143976ce | 294 | static unsigned long multiq_find(struct Qdisc *sch, u32 classid) |
92651940 AD |
295 | { |
296 | struct multiq_sched_data *q = qdisc_priv(sch); | |
297 | unsigned long band = TC_H_MIN(classid); | |
298 | ||
299 | if (band - 1 >= q->bands) | |
300 | return 0; | |
301 | return band; | |
302 | } | |
303 | ||
304 | static unsigned long multiq_bind(struct Qdisc *sch, unsigned long parent, | |
305 | u32 classid) | |
306 | { | |
143976ce | 307 | return multiq_find(sch, classid); |
92651940 AD |
308 | } |
309 | ||
310 | ||
143976ce | 311 | static void multiq_unbind(struct Qdisc *q, unsigned long cl) |
92651940 | 312 | { |
92651940 AD |
313 | } |
314 | ||
92651940 AD |
315 | static int multiq_dump_class(struct Qdisc *sch, unsigned long cl, |
316 | struct sk_buff *skb, struct tcmsg *tcm) | |
317 | { | |
318 | struct multiq_sched_data *q = qdisc_priv(sch); | |
319 | ||
92651940 | 320 | tcm->tcm_handle |= TC_H_MIN(cl); |
cc7ec456 | 321 | tcm->tcm_info = q->queues[cl - 1]->handle; |
92651940 AD |
322 | return 0; |
323 | } | |
324 | ||
325 | static int multiq_dump_class_stats(struct Qdisc *sch, unsigned long cl, | |
326 | struct gnet_dump *d) | |
327 | { | |
328 | struct multiq_sched_data *q = qdisc_priv(sch); | |
329 | struct Qdisc *cl_q; | |
330 | ||
331 | cl_q = q->queues[cl - 1]; | |
edb09eb1 ED |
332 | if (gnet_stats_copy_basic(qdisc_root_sleeping_running(sch), |
333 | d, NULL, &cl_q->bstats) < 0 || | |
5dd431b6 | 334 | qdisc_qstats_copy(d, cl_q) < 0) |
92651940 AD |
335 | return -1; |
336 | ||
337 | return 0; | |
338 | } | |
339 | ||
340 | static void multiq_walk(struct Qdisc *sch, struct qdisc_walker *arg) | |
341 | { | |
342 | struct multiq_sched_data *q = qdisc_priv(sch); | |
343 | int band; | |
344 | ||
345 | if (arg->stop) | |
346 | return; | |
347 | ||
348 | for (band = 0; band < q->bands; band++) { | |
349 | if (arg->count < arg->skip) { | |
350 | arg->count++; | |
351 | continue; | |
352 | } | |
cc7ec456 | 353 | if (arg->fn(sch, band + 1, arg) < 0) { |
92651940 AD |
354 | arg->stop = 1; |
355 | break; | |
356 | } | |
357 | arg->count++; | |
358 | } | |
359 | } | |
360 | ||
cbaacc4e AA |
361 | static struct tcf_block *multiq_tcf_block(struct Qdisc *sch, unsigned long cl, |
362 | struct netlink_ext_ack *extack) | |
92651940 AD |
363 | { |
364 | struct multiq_sched_data *q = qdisc_priv(sch); | |
365 | ||
366 | if (cl) | |
367 | return NULL; | |
6529eaba | 368 | return q->block; |
92651940 AD |
369 | } |
370 | ||
371 | static const struct Qdisc_class_ops multiq_class_ops = { | |
372 | .graft = multiq_graft, | |
373 | .leaf = multiq_leaf, | |
143976ce | 374 | .find = multiq_find, |
92651940 | 375 | .walk = multiq_walk, |
6529eaba | 376 | .tcf_block = multiq_tcf_block, |
92651940 | 377 | .bind_tcf = multiq_bind, |
143976ce | 378 | .unbind_tcf = multiq_unbind, |
92651940 AD |
379 | .dump = multiq_dump_class, |
380 | .dump_stats = multiq_dump_class_stats, | |
381 | }; | |
382 | ||
383 | static struct Qdisc_ops multiq_qdisc_ops __read_mostly = { | |
384 | .next = NULL, | |
385 | .cl_ops = &multiq_class_ops, | |
386 | .id = "multiq", | |
387 | .priv_size = sizeof(struct multiq_sched_data), | |
388 | .enqueue = multiq_enqueue, | |
389 | .dequeue = multiq_dequeue, | |
8e3af978 | 390 | .peek = multiq_peek, |
92651940 AD |
391 | .init = multiq_init, |
392 | .reset = multiq_reset, | |
393 | .destroy = multiq_destroy, | |
394 | .change = multiq_tune, | |
395 | .dump = multiq_dump, | |
396 | .owner = THIS_MODULE, | |
397 | }; | |
398 | ||
399 | static int __init multiq_module_init(void) | |
400 | { | |
401 | return register_qdisc(&multiq_qdisc_ops); | |
402 | } | |
403 | ||
404 | static void __exit multiq_module_exit(void) | |
405 | { | |
406 | unregister_qdisc(&multiq_qdisc_ops); | |
407 | } | |
408 | ||
409 | module_init(multiq_module_init) | |
410 | module_exit(multiq_module_exit) | |
411 | ||
412 | MODULE_LICENSE("GPL"); |