Commit | Line | Data |
---|---|---|
b8970f0b JF |
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> | |
3a9a231d | 17 | #include <linux/module.h> |
b8970f0b JF |
18 | #include <net/netlink.h> |
19 | #include <net/pkt_sched.h> | |
20 | #include <net/sch_generic.h> | |
4e8b86c0 | 21 | #include <net/pkt_cls.h> |
b8970f0b JF |
22 | |
23 | struct mqprio_sched { | |
24 | struct Qdisc **qdiscs; | |
4e8b86c0 AN |
25 | u16 mode; |
26 | u16 shaper; | |
2026fecf | 27 | int hw_offload; |
4e8b86c0 AN |
28 | u32 flags; |
29 | u64 min_rate[TC_QOPT_MAX_QUEUE]; | |
30 | u64 max_rate[TC_QOPT_MAX_QUEUE]; | |
b8970f0b JF |
31 | }; |
32 | ||
33 | static void mqprio_destroy(struct Qdisc *sch) | |
34 | { | |
35 | struct net_device *dev = qdisc_dev(sch); | |
36 | struct mqprio_sched *priv = qdisc_priv(sch); | |
37 | unsigned int ntx; | |
38 | ||
ac7100ba BH |
39 | if (priv->qdiscs) { |
40 | for (ntx = 0; | |
41 | ntx < dev->num_tx_queues && priv->qdiscs[ntx]; | |
42 | ntx++) | |
86bd446b | 43 | qdisc_put(priv->qdiscs[ntx]); |
ac7100ba BH |
44 | kfree(priv->qdiscs); |
45 | } | |
b8970f0b | 46 | |
56f36acd | 47 | if (priv->hw_offload && dev->netdev_ops->ndo_setup_tc) { |
4e8b86c0 AN |
48 | struct tc_mqprio_qopt_offload mqprio = { { 0 } }; |
49 | ||
50 | switch (priv->mode) { | |
51 | case TC_MQPRIO_MODE_DCB: | |
52 | case TC_MQPRIO_MODE_CHANNEL: | |
575ed7d3 NF |
53 | dev->netdev_ops->ndo_setup_tc(dev, |
54 | TC_SETUP_QDISC_MQPRIO, | |
4e8b86c0 AN |
55 | &mqprio); |
56 | break; | |
57 | default: | |
58 | return; | |
59 | } | |
56f36acd | 60 | } else { |
b8970f0b | 61 | netdev_set_num_tc(dev, 0); |
56f36acd | 62 | } |
b8970f0b JF |
63 | } |
64 | ||
65 | static int mqprio_parse_opt(struct net_device *dev, struct tc_mqprio_qopt *qopt) | |
66 | { | |
67 | int i, j; | |
68 | ||
69 | /* Verify num_tc is not out of max range */ | |
70 | if (qopt->num_tc > TC_MAX_QUEUE) | |
71 | return -EINVAL; | |
72 | ||
73 | /* Verify priority mapping uses valid tcs */ | |
74 | for (i = 0; i < TC_BITMASK + 1; i++) { | |
75 | if (qopt->prio_tc_map[i] >= qopt->num_tc) | |
76 | return -EINVAL; | |
77 | } | |
78 | ||
2026fecf AD |
79 | /* Limit qopt->hw to maximum supported offload value. Drivers have |
80 | * the option of overriding this later if they don't support the a | |
81 | * given offload type. | |
82 | */ | |
83 | if (qopt->hw > TC_MQPRIO_HW_OFFLOAD_MAX) | |
84 | qopt->hw = TC_MQPRIO_HW_OFFLOAD_MAX; | |
b8970f0b | 85 | |
2026fecf AD |
86 | /* If hardware offload is requested we will leave it to the device |
87 | * to either populate the queue counts itself or to validate the | |
88 | * provided queue counts. If ndo_setup_tc is not present then | |
89 | * hardware doesn't support offload and we should return an error. | |
b8970f0b JF |
90 | */ |
91 | if (qopt->hw) | |
2026fecf | 92 | return dev->netdev_ops->ndo_setup_tc ? 0 : -EINVAL; |
b8970f0b JF |
93 | |
94 | for (i = 0; i < qopt->num_tc; i++) { | |
95 | unsigned int last = qopt->offset[i] + qopt->count[i]; | |
96 | ||
97 | /* Verify the queue count is in tx range being equal to the | |
98 | * real_num_tx_queues indicates the last queue is in use. | |
99 | */ | |
100 | if (qopt->offset[i] >= dev->real_num_tx_queues || | |
101 | !qopt->count[i] || | |
102 | last > dev->real_num_tx_queues) | |
103 | return -EINVAL; | |
104 | ||
105 | /* Verify that the offset and counts do not overlap */ | |
106 | for (j = i + 1; j < qopt->num_tc; j++) { | |
107 | if (last > qopt->offset[j]) | |
108 | return -EINVAL; | |
109 | } | |
110 | } | |
111 | ||
112 | return 0; | |
113 | } | |
114 | ||
4e8b86c0 AN |
115 | static const struct nla_policy mqprio_policy[TCA_MQPRIO_MAX + 1] = { |
116 | [TCA_MQPRIO_MODE] = { .len = sizeof(u16) }, | |
117 | [TCA_MQPRIO_SHAPER] = { .len = sizeof(u16) }, | |
118 | [TCA_MQPRIO_MIN_RATE64] = { .type = NLA_NESTED }, | |
119 | [TCA_MQPRIO_MAX_RATE64] = { .type = NLA_NESTED }, | |
120 | }; | |
121 | ||
122 | static int parse_attr(struct nlattr *tb[], int maxtype, struct nlattr *nla, | |
123 | const struct nla_policy *policy, int len) | |
124 | { | |
125 | int nested_len = nla_len(nla) - NLA_ALIGN(len); | |
126 | ||
127 | if (nested_len >= nla_attr_size(0)) | |
128 | return nla_parse(tb, maxtype, nla_data(nla) + NLA_ALIGN(len), | |
129 | nested_len, policy, NULL); | |
130 | ||
131 | memset(tb, 0, sizeof(struct nlattr *) * (maxtype + 1)); | |
132 | return 0; | |
133 | } | |
134 | ||
e63d7dfd AA |
135 | static int mqprio_init(struct Qdisc *sch, struct nlattr *opt, |
136 | struct netlink_ext_ack *extack) | |
b8970f0b JF |
137 | { |
138 | struct net_device *dev = qdisc_dev(sch); | |
139 | struct mqprio_sched *priv = qdisc_priv(sch); | |
140 | struct netdev_queue *dev_queue; | |
141 | struct Qdisc *qdisc; | |
142 | int i, err = -EOPNOTSUPP; | |
143 | struct tc_mqprio_qopt *qopt = NULL; | |
4e8b86c0 AN |
144 | struct nlattr *tb[TCA_MQPRIO_MAX + 1]; |
145 | struct nlattr *attr; | |
146 | int rem; | |
22ce97fe | 147 | int len; |
b8970f0b JF |
148 | |
149 | BUILD_BUG_ON(TC_MAX_QUEUE != TC_QOPT_MAX_QUEUE); | |
150 | BUILD_BUG_ON(TC_BITMASK != TC_QOPT_BITMASK); | |
151 | ||
152 | if (sch->parent != TC_H_ROOT) | |
153 | return -EOPNOTSUPP; | |
154 | ||
155 | if (!netif_is_multiqueue(dev)) | |
156 | return -EOPNOTSUPP; | |
157 | ||
32302902 AD |
158 | /* make certain can allocate enough classids to handle queues */ |
159 | if (dev->num_tx_queues >= TC_H_MIN_PRIORITY) | |
160 | return -ENOMEM; | |
161 | ||
7838f2ce | 162 | if (!opt || nla_len(opt) < sizeof(*qopt)) |
b8970f0b JF |
163 | return -EINVAL; |
164 | ||
165 | qopt = nla_data(opt); | |
166 | if (mqprio_parse_opt(dev, qopt)) | |
167 | return -EINVAL; | |
168 | ||
22ce97fe | 169 | len = nla_len(opt) - NLA_ALIGN(sizeof(*qopt)); |
4e8b86c0 AN |
170 | if (len > 0) { |
171 | err = parse_attr(tb, TCA_MQPRIO_MAX, opt, mqprio_policy, | |
172 | sizeof(*qopt)); | |
173 | if (err < 0) | |
174 | return err; | |
175 | ||
176 | if (!qopt->hw) | |
177 | return -EINVAL; | |
178 | ||
179 | if (tb[TCA_MQPRIO_MODE]) { | |
180 | priv->flags |= TC_MQPRIO_F_MODE; | |
181 | priv->mode = *(u16 *)nla_data(tb[TCA_MQPRIO_MODE]); | |
182 | } | |
183 | ||
184 | if (tb[TCA_MQPRIO_SHAPER]) { | |
185 | priv->flags |= TC_MQPRIO_F_SHAPER; | |
186 | priv->shaper = *(u16 *)nla_data(tb[TCA_MQPRIO_SHAPER]); | |
187 | } | |
188 | ||
189 | if (tb[TCA_MQPRIO_MIN_RATE64]) { | |
190 | if (priv->shaper != TC_MQPRIO_SHAPER_BW_RATE) | |
191 | return -EINVAL; | |
192 | i = 0; | |
193 | nla_for_each_nested(attr, tb[TCA_MQPRIO_MIN_RATE64], | |
194 | rem) { | |
195 | if (nla_type(attr) != TCA_MQPRIO_MIN_RATE64) | |
196 | return -EINVAL; | |
197 | if (i >= qopt->num_tc) | |
198 | break; | |
199 | priv->min_rate[i] = *(u64 *)nla_data(attr); | |
200 | i++; | |
201 | } | |
202 | priv->flags |= TC_MQPRIO_F_MIN_RATE; | |
203 | } | |
204 | ||
205 | if (tb[TCA_MQPRIO_MAX_RATE64]) { | |
206 | if (priv->shaper != TC_MQPRIO_SHAPER_BW_RATE) | |
207 | return -EINVAL; | |
208 | i = 0; | |
209 | nla_for_each_nested(attr, tb[TCA_MQPRIO_MAX_RATE64], | |
210 | rem) { | |
211 | if (nla_type(attr) != TCA_MQPRIO_MAX_RATE64) | |
212 | return -EINVAL; | |
213 | if (i >= qopt->num_tc) | |
214 | break; | |
215 | priv->max_rate[i] = *(u64 *)nla_data(attr); | |
216 | i++; | |
217 | } | |
218 | priv->flags |= TC_MQPRIO_F_MAX_RATE; | |
219 | } | |
220 | } | |
221 | ||
b8970f0b JF |
222 | /* pre-allocate qdisc, attachment can't fail */ |
223 | priv->qdiscs = kcalloc(dev->num_tx_queues, sizeof(priv->qdiscs[0]), | |
224 | GFP_KERNEL); | |
87b60cfa ED |
225 | if (!priv->qdiscs) |
226 | return -ENOMEM; | |
b8970f0b JF |
227 | |
228 | for (i = 0; i < dev->num_tx_queues; i++) { | |
229 | dev_queue = netdev_get_tx_queue(dev, i); | |
1f27cde3 ED |
230 | qdisc = qdisc_create_dflt(dev_queue, |
231 | get_default_qdisc_ops(dev, i), | |
b8970f0b | 232 | TC_H_MAKE(TC_H_MAJ(sch->handle), |
a38a9882 | 233 | TC_H_MIN(i + 1)), extack); |
87b60cfa ED |
234 | if (!qdisc) |
235 | return -ENOMEM; | |
236 | ||
b8970f0b | 237 | priv->qdiscs[i] = qdisc; |
4eaf3b84 | 238 | qdisc->flags |= TCQ_F_ONETXQUEUE | TCQ_F_NOPARENT; |
b8970f0b JF |
239 | } |
240 | ||
241 | /* If the mqprio options indicate that hardware should own | |
242 | * the queue mapping then run ndo_setup_tc otherwise use the | |
243 | * supplied and verified mapping | |
244 | */ | |
245 | if (qopt->hw) { | |
4e8b86c0 | 246 | struct tc_mqprio_qopt_offload mqprio = {.qopt = *qopt}; |
16e5cc64 | 247 | |
4e8b86c0 AN |
248 | switch (priv->mode) { |
249 | case TC_MQPRIO_MODE_DCB: | |
250 | if (priv->shaper != TC_MQPRIO_SHAPER_DCB) | |
251 | return -EINVAL; | |
252 | break; | |
253 | case TC_MQPRIO_MODE_CHANNEL: | |
254 | mqprio.flags = priv->flags; | |
255 | if (priv->flags & TC_MQPRIO_F_MODE) | |
256 | mqprio.mode = priv->mode; | |
257 | if (priv->flags & TC_MQPRIO_F_SHAPER) | |
258 | mqprio.shaper = priv->shaper; | |
259 | if (priv->flags & TC_MQPRIO_F_MIN_RATE) | |
260 | for (i = 0; i < mqprio.qopt.num_tc; i++) | |
261 | mqprio.min_rate[i] = priv->min_rate[i]; | |
262 | if (priv->flags & TC_MQPRIO_F_MAX_RATE) | |
263 | for (i = 0; i < mqprio.qopt.num_tc; i++) | |
264 | mqprio.max_rate[i] = priv->max_rate[i]; | |
265 | break; | |
266 | default: | |
267 | return -EINVAL; | |
268 | } | |
269 | err = dev->netdev_ops->ndo_setup_tc(dev, | |
575ed7d3 | 270 | TC_SETUP_QDISC_MQPRIO, |
de4784ca | 271 | &mqprio); |
b8970f0b | 272 | if (err) |
87b60cfa | 273 | return err; |
2026fecf | 274 | |
4e8b86c0 | 275 | priv->hw_offload = mqprio.qopt.hw; |
b8970f0b JF |
276 | } else { |
277 | netdev_set_num_tc(dev, qopt->num_tc); | |
278 | for (i = 0; i < qopt->num_tc; i++) | |
279 | netdev_set_tc_queue(dev, i, | |
280 | qopt->count[i], qopt->offset[i]); | |
281 | } | |
282 | ||
283 | /* Always use supplied priority mappings */ | |
284 | for (i = 0; i < TC_BITMASK + 1; i++) | |
285 | netdev_set_prio_tc_map(dev, i, qopt->prio_tc_map[i]); | |
286 | ||
287 | sch->flags |= TCQ_F_MQROOT; | |
288 | return 0; | |
b8970f0b JF |
289 | } |
290 | ||
291 | static void mqprio_attach(struct Qdisc *sch) | |
292 | { | |
293 | struct net_device *dev = qdisc_dev(sch); | |
294 | struct mqprio_sched *priv = qdisc_priv(sch); | |
95dc1929 | 295 | struct Qdisc *qdisc, *old; |
b8970f0b JF |
296 | unsigned int ntx; |
297 | ||
298 | /* Attach underlying qdisc */ | |
299 | for (ntx = 0; ntx < dev->num_tx_queues; ntx++) { | |
300 | qdisc = priv->qdiscs[ntx]; | |
95dc1929 ED |
301 | old = dev_graft_qdisc(qdisc->dev_queue, qdisc); |
302 | if (old) | |
86bd446b | 303 | qdisc_put(old); |
95dc1929 | 304 | if (ntx < dev->real_num_tx_queues) |
49b49971 | 305 | qdisc_hash_add(qdisc, false); |
b8970f0b JF |
306 | } |
307 | kfree(priv->qdiscs); | |
308 | priv->qdiscs = NULL; | |
309 | } | |
310 | ||
311 | static struct netdev_queue *mqprio_queue_get(struct Qdisc *sch, | |
312 | unsigned long cl) | |
313 | { | |
314 | struct net_device *dev = qdisc_dev(sch); | |
32302902 | 315 | unsigned long ntx = cl - 1; |
b8970f0b JF |
316 | |
317 | if (ntx >= dev->num_tx_queues) | |
318 | return NULL; | |
319 | return netdev_get_tx_queue(dev, ntx); | |
320 | } | |
321 | ||
322 | static int mqprio_graft(struct Qdisc *sch, unsigned long cl, struct Qdisc *new, | |
653d6fd6 | 323 | struct Qdisc **old, struct netlink_ext_ack *extack) |
b8970f0b JF |
324 | { |
325 | struct net_device *dev = qdisc_dev(sch); | |
326 | struct netdev_queue *dev_queue = mqprio_queue_get(sch, cl); | |
327 | ||
328 | if (!dev_queue) | |
329 | return -EINVAL; | |
330 | ||
331 | if (dev->flags & IFF_UP) | |
332 | dev_deactivate(dev); | |
333 | ||
334 | *old = dev_graft_qdisc(dev_queue, new); | |
335 | ||
1abbe139 | 336 | if (new) |
4eaf3b84 | 337 | new->flags |= TCQ_F_ONETXQUEUE | TCQ_F_NOPARENT; |
1abbe139 | 338 | |
b8970f0b JF |
339 | if (dev->flags & IFF_UP) |
340 | dev_activate(dev); | |
341 | ||
342 | return 0; | |
343 | } | |
344 | ||
4e8b86c0 AN |
345 | static int dump_rates(struct mqprio_sched *priv, |
346 | struct tc_mqprio_qopt *opt, struct sk_buff *skb) | |
347 | { | |
348 | struct nlattr *nest; | |
349 | int i; | |
350 | ||
351 | if (priv->flags & TC_MQPRIO_F_MIN_RATE) { | |
352 | nest = nla_nest_start(skb, TCA_MQPRIO_MIN_RATE64); | |
353 | if (!nest) | |
354 | goto nla_put_failure; | |
355 | ||
356 | for (i = 0; i < opt->num_tc; i++) { | |
357 | if (nla_put(skb, TCA_MQPRIO_MIN_RATE64, | |
358 | sizeof(priv->min_rate[i]), | |
359 | &priv->min_rate[i])) | |
360 | goto nla_put_failure; | |
361 | } | |
362 | nla_nest_end(skb, nest); | |
363 | } | |
364 | ||
365 | if (priv->flags & TC_MQPRIO_F_MAX_RATE) { | |
366 | nest = nla_nest_start(skb, TCA_MQPRIO_MAX_RATE64); | |
367 | if (!nest) | |
368 | goto nla_put_failure; | |
369 | ||
370 | for (i = 0; i < opt->num_tc; i++) { | |
371 | if (nla_put(skb, TCA_MQPRIO_MAX_RATE64, | |
372 | sizeof(priv->max_rate[i]), | |
373 | &priv->max_rate[i])) | |
374 | goto nla_put_failure; | |
375 | } | |
376 | nla_nest_end(skb, nest); | |
377 | } | |
378 | return 0; | |
379 | ||
380 | nla_put_failure: | |
381 | nla_nest_cancel(skb, nest); | |
382 | return -1; | |
383 | } | |
384 | ||
b8970f0b JF |
385 | static int mqprio_dump(struct Qdisc *sch, struct sk_buff *skb) |
386 | { | |
387 | struct net_device *dev = qdisc_dev(sch); | |
388 | struct mqprio_sched *priv = qdisc_priv(sch); | |
4e8b86c0 | 389 | struct nlattr *nla = (struct nlattr *)skb_tail_pointer(skb); |
144ce879 | 390 | struct tc_mqprio_qopt opt = { 0 }; |
b8970f0b | 391 | struct Qdisc *qdisc; |
ce679e8d | 392 | unsigned int ntx, tc; |
b8970f0b JF |
393 | |
394 | sch->q.qlen = 0; | |
395 | memset(&sch->bstats, 0, sizeof(sch->bstats)); | |
396 | memset(&sch->qstats, 0, sizeof(sch->qstats)); | |
397 | ||
ce679e8d JF |
398 | /* MQ supports lockless qdiscs. However, statistics accounting needs |
399 | * to account for all, none, or a mix of locked and unlocked child | |
400 | * qdiscs. Percpu stats are added to counters in-band and locking | |
401 | * qdisc totals are added at end. | |
402 | */ | |
403 | for (ntx = 0; ntx < dev->num_tx_queues; ntx++) { | |
404 | qdisc = netdev_get_tx_queue(dev, ntx)->qdisc_sleeping; | |
b8970f0b | 405 | spin_lock_bh(qdisc_lock(qdisc)); |
ce679e8d JF |
406 | |
407 | if (qdisc_is_percpu_stats(qdisc)) { | |
408 | __u32 qlen = qdisc_qlen_sum(qdisc); | |
409 | ||
410 | __gnet_stats_copy_basic(NULL, &sch->bstats, | |
411 | qdisc->cpu_bstats, | |
412 | &qdisc->bstats); | |
413 | __gnet_stats_copy_queue(&sch->qstats, | |
414 | qdisc->cpu_qstats, | |
415 | &qdisc->qstats, qlen); | |
416 | } else { | |
417 | sch->q.qlen += qdisc->q.qlen; | |
418 | sch->bstats.bytes += qdisc->bstats.bytes; | |
419 | sch->bstats.packets += qdisc->bstats.packets; | |
420 | sch->qstats.backlog += qdisc->qstats.backlog; | |
421 | sch->qstats.drops += qdisc->qstats.drops; | |
422 | sch->qstats.requeues += qdisc->qstats.requeues; | |
423 | sch->qstats.overlimits += qdisc->qstats.overlimits; | |
424 | } | |
425 | ||
b8970f0b JF |
426 | spin_unlock_bh(qdisc_lock(qdisc)); |
427 | } | |
428 | ||
429 | opt.num_tc = netdev_get_num_tc(dev); | |
430 | memcpy(opt.prio_tc_map, dev->prio_tc_map, sizeof(opt.prio_tc_map)); | |
2026fecf | 431 | opt.hw = priv->hw_offload; |
b8970f0b | 432 | |
ce679e8d JF |
433 | for (tc = 0; tc < netdev_get_num_tc(dev); tc++) { |
434 | opt.count[tc] = dev->tc_to_txq[tc].count; | |
435 | opt.offset[tc] = dev->tc_to_txq[tc].offset; | |
b8970f0b JF |
436 | } |
437 | ||
4e8b86c0 AN |
438 | if (nla_put(skb, TCA_OPTIONS, NLA_ALIGN(sizeof(opt)), &opt)) |
439 | goto nla_put_failure; | |
440 | ||
441 | if ((priv->flags & TC_MQPRIO_F_MODE) && | |
442 | nla_put_u16(skb, TCA_MQPRIO_MODE, priv->mode)) | |
443 | goto nla_put_failure; | |
444 | ||
445 | if ((priv->flags & TC_MQPRIO_F_SHAPER) && | |
446 | nla_put_u16(skb, TCA_MQPRIO_SHAPER, priv->shaper)) | |
447 | goto nla_put_failure; | |
448 | ||
449 | if ((priv->flags & TC_MQPRIO_F_MIN_RATE || | |
450 | priv->flags & TC_MQPRIO_F_MAX_RATE) && | |
451 | (dump_rates(priv, &opt, skb) != 0)) | |
1b34ec43 | 452 | goto nla_put_failure; |
b8970f0b | 453 | |
4e8b86c0 | 454 | return nla_nest_end(skb, nla); |
b8970f0b | 455 | nla_put_failure: |
4e8b86c0 | 456 | nlmsg_trim(skb, nla); |
b8970f0b JF |
457 | return -1; |
458 | } | |
459 | ||
460 | static struct Qdisc *mqprio_leaf(struct Qdisc *sch, unsigned long cl) | |
461 | { | |
462 | struct netdev_queue *dev_queue = mqprio_queue_get(sch, cl); | |
463 | ||
464 | if (!dev_queue) | |
465 | return NULL; | |
466 | ||
467 | return dev_queue->qdisc_sleeping; | |
468 | } | |
469 | ||
143976ce | 470 | static unsigned long mqprio_find(struct Qdisc *sch, u32 classid) |
b8970f0b JF |
471 | { |
472 | struct net_device *dev = qdisc_dev(sch); | |
473 | unsigned int ntx = TC_H_MIN(classid); | |
474 | ||
32302902 AD |
475 | /* There are essentially two regions here that have valid classid |
476 | * values. The first region will have a classid value of 1 through | |
477 | * num_tx_queues. All of these are backed by actual Qdiscs. | |
478 | */ | |
479 | if (ntx < TC_H_MIN_PRIORITY) | |
480 | return (ntx <= dev->num_tx_queues) ? ntx : 0; | |
481 | ||
482 | /* The second region represents the hardware traffic classes. These | |
483 | * are represented by classid values of TC_H_MIN_PRIORITY through | |
484 | * TC_H_MIN_PRIORITY + netdev_get_num_tc - 1 | |
485 | */ | |
486 | return ((ntx - TC_H_MIN_PRIORITY) < netdev_get_num_tc(dev)) ? ntx : 0; | |
b8970f0b JF |
487 | } |
488 | ||
b8970f0b JF |
489 | static int mqprio_dump_class(struct Qdisc *sch, unsigned long cl, |
490 | struct sk_buff *skb, struct tcmsg *tcm) | |
491 | { | |
32302902 AD |
492 | if (cl < TC_H_MIN_PRIORITY) { |
493 | struct netdev_queue *dev_queue = mqprio_queue_get(sch, cl); | |
494 | struct net_device *dev = qdisc_dev(sch); | |
495 | int tc = netdev_txq_to_tc(dev, cl - 1); | |
b8970f0b | 496 | |
32302902 AD |
497 | tcm->tcm_parent = (tc < 0) ? 0 : |
498 | TC_H_MAKE(TC_H_MAJ(sch->handle), | |
499 | TC_H_MIN(tc + TC_H_MIN_PRIORITY)); | |
500 | tcm->tcm_info = dev_queue->qdisc_sleeping->handle; | |
501 | } else { | |
b8970f0b JF |
502 | tcm->tcm_parent = TC_H_ROOT; |
503 | tcm->tcm_info = 0; | |
b8970f0b JF |
504 | } |
505 | tcm->tcm_handle |= TC_H_MIN(cl); | |
506 | return 0; | |
507 | } | |
508 | ||
509 | static int mqprio_dump_class_stats(struct Qdisc *sch, unsigned long cl, | |
ea18fd95 | 510 | struct gnet_dump *d) |
511 | __releases(d->lock) | |
512 | __acquires(d->lock) | |
b8970f0b | 513 | { |
32302902 | 514 | if (cl >= TC_H_MIN_PRIORITY) { |
b8970f0b | 515 | int i; |
64015853 | 516 | __u32 qlen = 0; |
b8970f0b JF |
517 | struct gnet_stats_queue qstats = {0}; |
518 | struct gnet_stats_basic_packed bstats = {0}; | |
32302902 AD |
519 | struct net_device *dev = qdisc_dev(sch); |
520 | struct netdev_tc_txq tc = dev->tc_to_txq[cl & TC_BITMASK]; | |
b8970f0b JF |
521 | |
522 | /* Drop lock here it will be reclaimed before touching | |
523 | * statistics this is required because the d->lock we | |
524 | * hold here is the look on dev_queue->qdisc_sleeping | |
525 | * also acquired below. | |
526 | */ | |
edb09eb1 ED |
527 | if (d->lock) |
528 | spin_unlock_bh(d->lock); | |
b8970f0b JF |
529 | |
530 | for (i = tc.offset; i < tc.offset + tc.count; i++) { | |
46e5da40 | 531 | struct netdev_queue *q = netdev_get_tx_queue(dev, i); |
ce679e8d JF |
532 | struct Qdisc *qdisc = rtnl_dereference(q->qdisc); |
533 | struct gnet_stats_basic_cpu __percpu *cpu_bstats = NULL; | |
534 | struct gnet_stats_queue __percpu *cpu_qstats = NULL; | |
46e5da40 | 535 | |
b8970f0b | 536 | spin_lock_bh(qdisc_lock(qdisc)); |
ce679e8d JF |
537 | if (qdisc_is_percpu_stats(qdisc)) { |
538 | cpu_bstats = qdisc->cpu_bstats; | |
539 | cpu_qstats = qdisc->cpu_qstats; | |
540 | } | |
541 | ||
542 | qlen = qdisc_qlen_sum(qdisc); | |
543 | __gnet_stats_copy_basic(NULL, &sch->bstats, | |
544 | cpu_bstats, &qdisc->bstats); | |
545 | __gnet_stats_copy_queue(&sch->qstats, | |
546 | cpu_qstats, | |
547 | &qdisc->qstats, | |
548 | qlen); | |
b8970f0b JF |
549 | spin_unlock_bh(qdisc_lock(qdisc)); |
550 | } | |
ce679e8d | 551 | |
b8970f0b | 552 | /* Reclaim root sleeping lock before completing stats */ |
edb09eb1 ED |
553 | if (d->lock) |
554 | spin_lock_bh(d->lock); | |
555 | if (gnet_stats_copy_basic(NULL, d, NULL, &bstats) < 0 || | |
b0ab6f92 | 556 | gnet_stats_copy_queue(d, NULL, &qstats, qlen) < 0) |
b8970f0b JF |
557 | return -1; |
558 | } else { | |
559 | struct netdev_queue *dev_queue = mqprio_queue_get(sch, cl); | |
560 | ||
561 | sch = dev_queue->qdisc_sleeping; | |
edb09eb1 ED |
562 | if (gnet_stats_copy_basic(qdisc_root_sleeping_running(sch), |
563 | d, NULL, &sch->bstats) < 0 || | |
b0ab6f92 JF |
564 | gnet_stats_copy_queue(d, NULL, |
565 | &sch->qstats, sch->q.qlen) < 0) | |
b8970f0b JF |
566 | return -1; |
567 | } | |
568 | return 0; | |
569 | } | |
570 | ||
571 | static void mqprio_walk(struct Qdisc *sch, struct qdisc_walker *arg) | |
572 | { | |
573 | struct net_device *dev = qdisc_dev(sch); | |
574 | unsigned long ntx; | |
575 | ||
576 | if (arg->stop) | |
577 | return; | |
578 | ||
579 | /* Walk hierarchy with a virtual class per tc */ | |
580 | arg->count = arg->skip; | |
32302902 AD |
581 | for (ntx = arg->skip; ntx < netdev_get_num_tc(dev); ntx++) { |
582 | if (arg->fn(sch, ntx + TC_H_MIN_PRIORITY, arg) < 0) { | |
583 | arg->stop = 1; | |
584 | return; | |
585 | } | |
586 | arg->count++; | |
587 | } | |
588 | ||
589 | /* Pad the values and skip over unused traffic classes */ | |
590 | if (ntx < TC_MAX_QUEUE) { | |
591 | arg->count = TC_MAX_QUEUE; | |
592 | ntx = TC_MAX_QUEUE; | |
593 | } | |
594 | ||
595 | /* Reset offset, sort out remaining per-queue qdiscs */ | |
596 | for (ntx -= TC_MAX_QUEUE; ntx < dev->num_tx_queues; ntx++) { | |
b8970f0b JF |
597 | if (arg->fn(sch, ntx + 1, arg) < 0) { |
598 | arg->stop = 1; | |
32302902 | 599 | return; |
b8970f0b JF |
600 | } |
601 | arg->count++; | |
602 | } | |
603 | } | |
604 | ||
0f7787b4 JSP |
605 | static struct netdev_queue *mqprio_select_queue(struct Qdisc *sch, |
606 | struct tcmsg *tcm) | |
607 | { | |
608 | return mqprio_queue_get(sch, TC_H_MIN(tcm->tcm_parent)); | |
609 | } | |
610 | ||
b8970f0b JF |
611 | static const struct Qdisc_class_ops mqprio_class_ops = { |
612 | .graft = mqprio_graft, | |
613 | .leaf = mqprio_leaf, | |
143976ce | 614 | .find = mqprio_find, |
b8970f0b JF |
615 | .walk = mqprio_walk, |
616 | .dump = mqprio_dump_class, | |
617 | .dump_stats = mqprio_dump_class_stats, | |
0f7787b4 | 618 | .select_queue = mqprio_select_queue, |
b8970f0b JF |
619 | }; |
620 | ||
ea18fd95 | 621 | static struct Qdisc_ops mqprio_qdisc_ops __read_mostly = { |
b8970f0b JF |
622 | .cl_ops = &mqprio_class_ops, |
623 | .id = "mqprio", | |
624 | .priv_size = sizeof(struct mqprio_sched), | |
625 | .init = mqprio_init, | |
626 | .destroy = mqprio_destroy, | |
627 | .attach = mqprio_attach, | |
628 | .dump = mqprio_dump, | |
629 | .owner = THIS_MODULE, | |
630 | }; | |
631 | ||
632 | static int __init mqprio_module_init(void) | |
633 | { | |
634 | return register_qdisc(&mqprio_qdisc_ops); | |
635 | } | |
636 | ||
637 | static void __exit mqprio_module_exit(void) | |
638 | { | |
639 | unregister_qdisc(&mqprio_qdisc_ops); | |
640 | } | |
641 | ||
642 | module_init(mqprio_module_init); | |
643 | module_exit(mqprio_module_exit); | |
644 | ||
645 | MODULE_LICENSE("GPL"); |