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audit: rework audit_log_start()
[linux/fpc-iii.git] / net / sched / sch_mqprio.c
blob549c6635992444d08652b7876262aa9f69e5c99d
1 /*
2 * net/sched/sch_mqprio.c
3 *
4 * Copyright (c) 2010 John Fastabend <john.r.fastabend@intel.com>
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * version 2 as published by the Free Software Foundation.
9 */
10
11 #include <linux/types.h>
12 #include <linux/slab.h>
13 #include <linux/kernel.h>
14 #include <linux/string.h>
15 #include <linux/errno.h>
16 #include <linux/skbuff.h>
17 #include <linux/module.h>
18 #include <net/netlink.h>
19 #include <net/pkt_sched.h>
20 #include <net/sch_generic.h>
21
22 struct mqprio_sched {
23 struct Qdisc **qdiscs;
24 int hw_owned;
25 };
26
27 static void mqprio_destroy(struct Qdisc *sch)
28 {
29 struct net_device *dev = qdisc_dev(sch);
30 struct mqprio_sched *priv = qdisc_priv(sch);
31 struct tc_to_netdev tc = {.type = TC_SETUP_MQPRIO};
32 unsigned int ntx;
33
34 if (priv->qdiscs) {
35 for (ntx = 0;
36 ntx < dev->num_tx_queues && priv->qdiscs[ntx];
37 ntx++)
38 qdisc_destroy(priv->qdiscs[ntx]);
39 kfree(priv->qdiscs);
40 }
41
42 if (priv->hw_owned && dev->netdev_ops->ndo_setup_tc)
43 dev->netdev_ops->ndo_setup_tc(dev, sch->handle, 0, &tc);
44 else
45 netdev_set_num_tc(dev, 0);
46 }
47
48 static int mqprio_parse_opt(struct net_device *dev, struct tc_mqprio_qopt *qopt)
49 {
50 int i, j;
51
52 /* Verify num_tc is not out of max range */
53 if (qopt->num_tc > TC_MAX_QUEUE)
54 return -EINVAL;
55
56 /* Verify priority mapping uses valid tcs */
57 for (i = 0; i < TC_BITMASK + 1; i++) {
58 if (qopt->prio_tc_map[i] >= qopt->num_tc)
59 return -EINVAL;
60 }
61
62 /* net_device does not support requested operation */
63 if (qopt->hw && !dev->netdev_ops->ndo_setup_tc)
64 return -EINVAL;
65
66 /* if hw owned qcount and qoffset are taken from LLD so
67 * no reason to verify them here
68 */
69 if (qopt->hw)
70 return 0;
71
72 for (i = 0; i < qopt->num_tc; i++) {
73 unsigned int last = qopt->offset[i] + qopt->count[i];
74
75 /* Verify the queue count is in tx range being equal to the
76 * real_num_tx_queues indicates the last queue is in use.
77 */
78 if (qopt->offset[i] >= dev->real_num_tx_queues ||
79 !qopt->count[i] ||
80 last > dev->real_num_tx_queues)
81 return -EINVAL;
82
83 /* Verify that the offset and counts do not overlap */
84 for (j = i + 1; j < qopt->num_tc; j++) {
85 if (last > qopt->offset[j])
86 return -EINVAL;
87 }
88 }
89
90 return 0;
91 }
92
93 static int mqprio_init(struct Qdisc *sch, struct nlattr *opt)
94 {
95 struct net_device *dev = qdisc_dev(sch);
96 struct mqprio_sched *priv = qdisc_priv(sch);
97 struct netdev_queue *dev_queue;
98 struct Qdisc *qdisc;
99 int i, err = -EOPNOTSUPP;
100 struct tc_mqprio_qopt *qopt = NULL;
101
102 BUILD_BUG_ON(TC_MAX_QUEUE != TC_QOPT_MAX_QUEUE);
103 BUILD_BUG_ON(TC_BITMASK != TC_QOPT_BITMASK);
104
105 if (sch->parent != TC_H_ROOT)
106 return -EOPNOTSUPP;
107
108 if (!netif_is_multiqueue(dev))
109 return -EOPNOTSUPP;
110
111 if (!opt || nla_len(opt) < sizeof(*qopt))
112 return -EINVAL;
113
114 qopt = nla_data(opt);
115 if (mqprio_parse_opt(dev, qopt))
116 return -EINVAL;
117
118 /* pre-allocate qdisc, attachment can't fail */
119 priv->qdiscs = kcalloc(dev->num_tx_queues, sizeof(priv->qdiscs[0]),
120 GFP_KERNEL);
121 if (priv->qdiscs == NULL) {
122 err = -ENOMEM;
123 goto err;
124 }
125
126 for (i = 0; i < dev->num_tx_queues; i++) {
127 dev_queue = netdev_get_tx_queue(dev, i);
128 qdisc = qdisc_create_dflt(dev_queue,
129 get_default_qdisc_ops(dev, i),
130 TC_H_MAKE(TC_H_MAJ(sch->handle),
131 TC_H_MIN(i + 1)));
132 if (qdisc == NULL) {
133 err = -ENOMEM;
134 goto err;
135 }
136 priv->qdiscs[i] = qdisc;
137 qdisc->flags |= TCQ_F_ONETXQUEUE | TCQ_F_NOPARENT;
138 }
139
140 /* If the mqprio options indicate that hardware should own
141 * the queue mapping then run ndo_setup_tc otherwise use the
142 * supplied and verified mapping
143 */
144 if (qopt->hw) {
145 struct tc_to_netdev tc = {.type = TC_SETUP_MQPRIO,
146 { .tc = qopt->num_tc }};
147
148 priv->hw_owned = 1;
149 err = dev->netdev_ops->ndo_setup_tc(dev, sch->handle, 0, &tc);
150 if (err)
151 goto err;
152 } else {
153 netdev_set_num_tc(dev, qopt->num_tc);
154 for (i = 0; i < qopt->num_tc; i++)
155 netdev_set_tc_queue(dev, i,
156 qopt->count[i], qopt->offset[i]);
157 }
158
159 /* Always use supplied priority mappings */
160 for (i = 0; i < TC_BITMASK + 1; i++)
161 netdev_set_prio_tc_map(dev, i, qopt->prio_tc_map[i]);
162
163 sch->flags |= TCQ_F_MQROOT;
164 return 0;
165
166 err:
167 mqprio_destroy(sch);
168 return err;
169 }
170
171 static void mqprio_attach(struct Qdisc *sch)
172 {
173 struct net_device *dev = qdisc_dev(sch);
174 struct mqprio_sched *priv = qdisc_priv(sch);
175 struct Qdisc *qdisc, *old;
176 unsigned int ntx;
177
178 /* Attach underlying qdisc */
179 for (ntx = 0; ntx < dev->num_tx_queues; ntx++) {
180 qdisc = priv->qdiscs[ntx];
181 old = dev_graft_qdisc(qdisc->dev_queue, qdisc);
182 if (old)
183 qdisc_destroy(old);
184 if (ntx < dev->real_num_tx_queues)
185 qdisc_list_add(qdisc);
186 }
187 kfree(priv->qdiscs);
188 priv->qdiscs = NULL;
189 }
190
191 static struct netdev_queue *mqprio_queue_get(struct Qdisc *sch,
192 unsigned long cl)
193 {
194 struct net_device *dev = qdisc_dev(sch);
195 unsigned long ntx = cl - 1 - netdev_get_num_tc(dev);
196
197 if (ntx >= dev->num_tx_queues)
198 return NULL;
199 return netdev_get_tx_queue(dev, ntx);
200 }
201
202 static int mqprio_graft(struct Qdisc *sch, unsigned long cl, struct Qdisc *new,
203 struct Qdisc **old)
204 {
205 struct net_device *dev = qdisc_dev(sch);
206 struct netdev_queue *dev_queue = mqprio_queue_get(sch, cl);
207
208 if (!dev_queue)
209 return -EINVAL;
210
211 if (dev->flags & IFF_UP)
212 dev_deactivate(dev);
213
214 *old = dev_graft_qdisc(dev_queue, new);
215
216 if (new)
217 new->flags |= TCQ_F_ONETXQUEUE | TCQ_F_NOPARENT;
218
219 if (dev->flags & IFF_UP)
220 dev_activate(dev);
221
222 return 0;
223 }
224
225 static int mqprio_dump(struct Qdisc *sch, struct sk_buff *skb)
226 {
227 struct net_device *dev = qdisc_dev(sch);
228 struct mqprio_sched *priv = qdisc_priv(sch);
229 unsigned char *b = skb_tail_pointer(skb);
230 struct tc_mqprio_qopt opt = { 0 };
231 struct Qdisc *qdisc;
232 unsigned int i;
233
234 sch->q.qlen = 0;
235 memset(&sch->bstats, 0, sizeof(sch->bstats));
236 memset(&sch->qstats, 0, sizeof(sch->qstats));
237
238 for (i = 0; i < dev->num_tx_queues; i++) {
239 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc);
240 spin_lock_bh(qdisc_lock(qdisc));
241 sch->q.qlen += qdisc->q.qlen;
242 sch->bstats.bytes += qdisc->bstats.bytes;
243 sch->bstats.packets += qdisc->bstats.packets;
244 sch->qstats.backlog += qdisc->qstats.backlog;
245 sch->qstats.drops += qdisc->qstats.drops;
246 sch->qstats.requeues += qdisc->qstats.requeues;
247 sch->qstats.overlimits += qdisc->qstats.overlimits;
248 spin_unlock_bh(qdisc_lock(qdisc));
249 }
250
251 opt.num_tc = netdev_get_num_tc(dev);
252 memcpy(opt.prio_tc_map, dev->prio_tc_map, sizeof(opt.prio_tc_map));
253 opt.hw = priv->hw_owned;
254
255 for (i = 0; i < netdev_get_num_tc(dev); i++) {
256 opt.count[i] = dev->tc_to_txq[i].count;
257 opt.offset[i] = dev->tc_to_txq[i].offset;
258 }
259
260 if (nla_put(skb, TCA_OPTIONS, sizeof(opt), &opt))
261 goto nla_put_failure;
262
263 return skb->len;
264 nla_put_failure:
265 nlmsg_trim(skb, b);
266 return -1;
267 }
268
269 static struct Qdisc *mqprio_leaf(struct Qdisc *sch, unsigned long cl)
270 {
271 struct netdev_queue *dev_queue = mqprio_queue_get(sch, cl);
272
273 if (!dev_queue)
274 return NULL;
275
276 return dev_queue->qdisc_sleeping;
277 }
278
279 static unsigned long mqprio_get(struct Qdisc *sch, u32 classid)
280 {
281 struct net_device *dev = qdisc_dev(sch);
282 unsigned int ntx = TC_H_MIN(classid);
283
284 if (ntx > dev->num_tx_queues + netdev_get_num_tc(dev))
285 return 0;
286 return ntx;
287 }
288
289 static void mqprio_put(struct Qdisc *sch, unsigned long cl)
290 {
291 }
292
293 static int mqprio_dump_class(struct Qdisc *sch, unsigned long cl,
294 struct sk_buff *skb, struct tcmsg *tcm)
295 {
296 struct net_device *dev = qdisc_dev(sch);
297
298 if (cl <= netdev_get_num_tc(dev)) {
299 tcm->tcm_parent = TC_H_ROOT;
300 tcm->tcm_info = 0;
301 } else {
302 int i;
303 struct netdev_queue *dev_queue;
304
305 dev_queue = mqprio_queue_get(sch, cl);
306 tcm->tcm_parent = 0;
307 for (i = 0; i < netdev_get_num_tc(dev); i++) {
308 struct netdev_tc_txq tc = dev->tc_to_txq[i];
309 int q_idx = cl - netdev_get_num_tc(dev);
310
311 if (q_idx > tc.offset &&
312 q_idx <= tc.offset + tc.count) {
313 tcm->tcm_parent =
314 TC_H_MAKE(TC_H_MAJ(sch->handle),
315 TC_H_MIN(i + 1));
316 break;
317 }
318 }
319 tcm->tcm_info = dev_queue->qdisc_sleeping->handle;
320 }
321 tcm->tcm_handle |= TC_H_MIN(cl);
322 return 0;
323 }
324
325 static int mqprio_dump_class_stats(struct Qdisc *sch, unsigned long cl,
326 struct gnet_dump *d)
327 __releases(d->lock)
328 __acquires(d->lock)
329 {
330 struct net_device *dev = qdisc_dev(sch);
331
332 if (cl <= netdev_get_num_tc(dev)) {
333 int i;
334 __u32 qlen = 0;
335 struct Qdisc *qdisc;
336 struct gnet_stats_queue qstats = {0};
337 struct gnet_stats_basic_packed bstats = {0};
338 struct netdev_tc_txq tc = dev->tc_to_txq[cl - 1];
339
340 /* Drop lock here it will be reclaimed before touching
341 * statistics this is required because the d->lock we
342 * hold here is the look on dev_queue->qdisc_sleeping
343 * also acquired below.
344 */
345 if (d->lock)
346 spin_unlock_bh(d->lock);
347
348 for (i = tc.offset; i < tc.offset + tc.count; i++) {
349 struct netdev_queue *q = netdev_get_tx_queue(dev, i);
350
351 qdisc = rtnl_dereference(q->qdisc);
352 spin_lock_bh(qdisc_lock(qdisc));
353 qlen += qdisc->q.qlen;
354 bstats.bytes += qdisc->bstats.bytes;
355 bstats.packets += qdisc->bstats.packets;
356 qstats.backlog += qdisc->qstats.backlog;
357 qstats.drops += qdisc->qstats.drops;
358 qstats.requeues += qdisc->qstats.requeues;
359 qstats.overlimits += qdisc->qstats.overlimits;
360 spin_unlock_bh(qdisc_lock(qdisc));
361 }
362 /* Reclaim root sleeping lock before completing stats */
363 if (d->lock)
364 spin_lock_bh(d->lock);
365 if (gnet_stats_copy_basic(NULL, d, NULL, &bstats) < 0 ||
366 gnet_stats_copy_queue(d, NULL, &qstats, qlen) < 0)
367 return -1;
368 } else {
369 struct netdev_queue *dev_queue = mqprio_queue_get(sch, cl);
370
371 sch = dev_queue->qdisc_sleeping;
372 if (gnet_stats_copy_basic(qdisc_root_sleeping_running(sch),
373 d, NULL, &sch->bstats) < 0 ||
374 gnet_stats_copy_queue(d, NULL,
375 &sch->qstats, sch->q.qlen) < 0)
376 return -1;
377 }
378 return 0;
379 }
380
381 static void mqprio_walk(struct Qdisc *sch, struct qdisc_walker *arg)
382 {
383 struct net_device *dev = qdisc_dev(sch);
384 unsigned long ntx;
385
386 if (arg->stop)
387 return;
388
389 /* Walk hierarchy with a virtual class per tc */
390 arg->count = arg->skip;
391 for (ntx = arg->skip;
392 ntx < dev->num_tx_queues + netdev_get_num_tc(dev);
393 ntx++) {
394 if (arg->fn(sch, ntx + 1, arg) < 0) {
395 arg->stop = 1;
396 break;
397 }
398 arg->count++;
399 }
400 }
401
402 static const struct Qdisc_class_ops mqprio_class_ops = {
403 .graft = mqprio_graft,
404 .leaf = mqprio_leaf,
405 .get = mqprio_get,
406 .put = mqprio_put,
407 .walk = mqprio_walk,
408 .dump = mqprio_dump_class,
409 .dump_stats = mqprio_dump_class_stats,
410 };
411
412 static struct Qdisc_ops mqprio_qdisc_ops __read_mostly = {
413 .cl_ops = &mqprio_class_ops,
414 .id = "mqprio",
415 .priv_size = sizeof(struct mqprio_sched),
416 .init = mqprio_init,
417 .destroy = mqprio_destroy,
418 .attach = mqprio_attach,
419 .dump = mqprio_dump,
420 .owner = THIS_MODULE,
421 };
422
423 static int __init mqprio_module_init(void)
424 {
425 return register_qdisc(&mqprio_qdisc_ops);
426 }
427
428 static void __exit mqprio_module_exit(void)
429 {
430 unregister_qdisc(&mqprio_qdisc_ops);
431 }
432
433 module_init(mqprio_module_init);
434 module_exit(mqprio_module_exit);
435
436 MODULE_LICENSE("GPL");
Linux with added FPC-III support