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1/*
2 * net/sched/sch_mq.c Classful multiqueue dummy scheduler
3 *
4 * Copyright (c) 2009 Patrick McHardy <kaber@trash.net>
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/export.h>
15#include <linux/string.h>
16#include <linux/errno.h>
17#include <linux/skbuff.h>
18#include <net/netlink.h>
19#include <net/pkt_sched.h>
20
21struct mq_sched {
22 struct Qdisc **qdiscs;
23};
24
25static void mq_destroy(struct Qdisc *sch)
26{
27 struct net_device *dev = qdisc_dev(sch);
28 struct mq_sched *priv = qdisc_priv(sch);
29 unsigned int ntx;
30
31 if (!priv->qdiscs)
32 return;
33 for (ntx = 0; ntx < dev->num_tx_queues && priv->qdiscs[ntx]; ntx++)
34 qdisc_destroy(priv->qdiscs[ntx]);
35 kfree(priv->qdiscs);
36}
37
38static int mq_init(struct Qdisc *sch, struct nlattr *opt)
39{
40 struct net_device *dev = qdisc_dev(sch);
41 struct mq_sched *priv = qdisc_priv(sch);
42 struct netdev_queue *dev_queue;
43 struct Qdisc *qdisc;
44 unsigned int ntx;
45
46 if (sch->parent != TC_H_ROOT)
47 return -EOPNOTSUPP;
48
49 if (!netif_is_multiqueue(dev))
50 return -EOPNOTSUPP;
51
52 /* pre-allocate qdiscs, attachment can't fail */
53 priv->qdiscs = kcalloc(dev->num_tx_queues, sizeof(priv->qdiscs[0]),
54 GFP_KERNEL);
55 if (priv->qdiscs == NULL)
56 return -ENOMEM;
57
58 for (ntx = 0; ntx < dev->num_tx_queues; ntx++) {
59 dev_queue = netdev_get_tx_queue(dev, ntx);
60 qdisc = qdisc_create_dflt(dev_queue, default_qdisc_ops,
61 TC_H_MAKE(TC_H_MAJ(sch->handle),
62 TC_H_MIN(ntx + 1)));
63 if (qdisc == NULL)
64 goto err;
65 priv->qdiscs[ntx] = qdisc;
66 qdisc->flags |= TCQ_F_ONETXQUEUE;
67 }
68
69 sch->flags |= TCQ_F_MQROOT;
70 return 0;
71
72err:
73 mq_destroy(sch);
74 return -ENOMEM;
75}
76
77static void mq_attach(struct Qdisc *sch)
78{
79 struct net_device *dev = qdisc_dev(sch);
80 struct mq_sched *priv = qdisc_priv(sch);
81 struct Qdisc *qdisc, *old;
82 unsigned int ntx;
83
84 for (ntx = 0; ntx < dev->num_tx_queues; ntx++) {
85 qdisc = priv->qdiscs[ntx];
86 old = dev_graft_qdisc(qdisc->dev_queue, qdisc);
87 if (old)
88 qdisc_destroy(old);
89#ifdef CONFIG_NET_SCHED
90 if (ntx < dev->real_num_tx_queues)
91 qdisc_list_add(qdisc);
92#endif
93
94 }
95 kfree(priv->qdiscs);
96 priv->qdiscs = NULL;
97}
98
99static int mq_dump(struct Qdisc *sch, struct sk_buff *skb)
100{
101 struct net_device *dev = qdisc_dev(sch);
102 struct Qdisc *qdisc;
103 unsigned int ntx;
104
105 sch->q.qlen = 0;
106 memset(&sch->bstats, 0, sizeof(sch->bstats));
107 memset(&sch->qstats, 0, sizeof(sch->qstats));
108
109 for (ntx = 0; ntx < dev->num_tx_queues; ntx++) {
110 qdisc = netdev_get_tx_queue(dev, ntx)->qdisc_sleeping;
111 spin_lock_bh(qdisc_lock(qdisc));
112 sch->q.qlen += qdisc->q.qlen;
113 sch->bstats.bytes += qdisc->bstats.bytes;
114 sch->bstats.packets += qdisc->bstats.packets;
115 sch->qstats.qlen += qdisc->qstats.qlen;
116 sch->qstats.backlog += qdisc->qstats.backlog;
117 sch->qstats.drops += qdisc->qstats.drops;
118 sch->qstats.requeues += qdisc->qstats.requeues;
119 sch->qstats.overlimits += qdisc->qstats.overlimits;
120 spin_unlock_bh(qdisc_lock(qdisc));
121 }
122 return 0;
123}
124
125static struct netdev_queue *mq_queue_get(struct Qdisc *sch, unsigned long cl)
126{
127 struct net_device *dev = qdisc_dev(sch);
128 unsigned long ntx = cl - 1;
129
130 if (ntx >= dev->num_tx_queues)
131 return NULL;
132 return netdev_get_tx_queue(dev, ntx);
133}
134
135static struct netdev_queue *mq_select_queue(struct Qdisc *sch,
136 struct tcmsg *tcm)
137{
138 unsigned int ntx = TC_H_MIN(tcm->tcm_parent);
139 struct netdev_queue *dev_queue = mq_queue_get(sch, ntx);
140
141 if (!dev_queue) {
142 struct net_device *dev = qdisc_dev(sch);
143
144 return netdev_get_tx_queue(dev, 0);
145 }
146 return dev_queue;
147}
148
149static int mq_graft(struct Qdisc *sch, unsigned long cl, struct Qdisc *new,
150 struct Qdisc **old)
151{
152 struct netdev_queue *dev_queue = mq_queue_get(sch, cl);
153 struct net_device *dev = qdisc_dev(sch);
154
155 if (dev->flags & IFF_UP)
156 dev_deactivate(dev);
157
158 *old = dev_graft_qdisc(dev_queue, new);
159 if (new)
160 new->flags |= TCQ_F_ONETXQUEUE;
161 if (dev->flags & IFF_UP)
162 dev_activate(dev);
163 return 0;
164}
165
166static struct Qdisc *mq_leaf(struct Qdisc *sch, unsigned long cl)
167{
168 struct netdev_queue *dev_queue = mq_queue_get(sch, cl);
169
170 return dev_queue->qdisc_sleeping;
171}
172
173static unsigned long mq_get(struct Qdisc *sch, u32 classid)
174{
175 unsigned int ntx = TC_H_MIN(classid);
176
177 if (!mq_queue_get(sch, ntx))
178 return 0;
179 return ntx;
180}
181
182static void mq_put(struct Qdisc *sch, unsigned long cl)
183{
184}
185
186static int mq_dump_class(struct Qdisc *sch, unsigned long cl,
187 struct sk_buff *skb, struct tcmsg *tcm)
188{
189 struct netdev_queue *dev_queue = mq_queue_get(sch, cl);
190
191 tcm->tcm_parent = TC_H_ROOT;
192 tcm->tcm_handle |= TC_H_MIN(cl);
193 tcm->tcm_info = dev_queue->qdisc_sleeping->handle;
194 return 0;
195}
196
197static int mq_dump_class_stats(struct Qdisc *sch, unsigned long cl,
198 struct gnet_dump *d)
199{
200 struct netdev_queue *dev_queue = mq_queue_get(sch, cl);
201
202 sch = dev_queue->qdisc_sleeping;
203 sch->qstats.qlen = sch->q.qlen;
204 if (gnet_stats_copy_basic(d, &sch->bstats) < 0 ||
205 gnet_stats_copy_queue(d, &sch->qstats) < 0)
206 return -1;
207 return 0;
208}
209
210static void mq_walk(struct Qdisc *sch, struct qdisc_walker *arg)
211{
212 struct net_device *dev = qdisc_dev(sch);
213 unsigned int ntx;
214
215 if (arg->stop)
216 return;
217
218 arg->count = arg->skip;
219 for (ntx = arg->skip; ntx < dev->num_tx_queues; ntx++) {
220 if (arg->fn(sch, ntx + 1, arg) < 0) {
221 arg->stop = 1;
222 break;
223 }
224 arg->count++;
225 }
226}
227
228static const struct Qdisc_class_ops mq_class_ops = {
229 .select_queue = mq_select_queue,
230 .graft = mq_graft,
231 .leaf = mq_leaf,
232 .get = mq_get,
233 .put = mq_put,
234 .walk = mq_walk,
235 .dump = mq_dump_class,
236 .dump_stats = mq_dump_class_stats,
237};
238
239struct Qdisc_ops mq_qdisc_ops __read_mostly = {
240 .cl_ops = &mq_class_ops,
241 .id = "mq",
242 .priv_size = sizeof(struct mq_sched),
243 .init = mq_init,
244 .destroy = mq_destroy,
245 .attach = mq_attach,
246 .dump = mq_dump,
247 .owner = THIS_MODULE,
248};
1/*
2 * net/sched/sch_mq.c Classful multiqueue dummy scheduler
3 *
4 * Copyright (c) 2009 Patrick McHardy <kaber@trash.net>
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 <net/netlink.h>
18#include <net/pkt_sched.h>
19
20struct mq_sched {
21 struct Qdisc **qdiscs;
22};
23
24static void mq_destroy(struct Qdisc *sch)
25{
26 struct net_device *dev = qdisc_dev(sch);
27 struct mq_sched *priv = qdisc_priv(sch);
28 unsigned int ntx;
29
30 if (!priv->qdiscs)
31 return;
32 for (ntx = 0; ntx < dev->num_tx_queues && priv->qdiscs[ntx]; ntx++)
33 qdisc_destroy(priv->qdiscs[ntx]);
34 kfree(priv->qdiscs);
35}
36
37static int mq_init(struct Qdisc *sch, struct nlattr *opt)
38{
39 struct net_device *dev = qdisc_dev(sch);
40 struct mq_sched *priv = qdisc_priv(sch);
41 struct netdev_queue *dev_queue;
42 struct Qdisc *qdisc;
43 unsigned int ntx;
44
45 if (sch->parent != TC_H_ROOT)
46 return -EOPNOTSUPP;
47
48 if (!netif_is_multiqueue(dev))
49 return -EOPNOTSUPP;
50
51 /* pre-allocate qdiscs, attachment can't fail */
52 priv->qdiscs = kcalloc(dev->num_tx_queues, sizeof(priv->qdiscs[0]),
53 GFP_KERNEL);
54 if (priv->qdiscs == NULL)
55 return -ENOMEM;
56
57 for (ntx = 0; ntx < dev->num_tx_queues; ntx++) {
58 dev_queue = netdev_get_tx_queue(dev, ntx);
59 qdisc = qdisc_create_dflt(dev_queue, &pfifo_fast_ops,
60 TC_H_MAKE(TC_H_MAJ(sch->handle),
61 TC_H_MIN(ntx + 1)));
62 if (qdisc == NULL)
63 goto err;
64 priv->qdiscs[ntx] = qdisc;
65 }
66
67 sch->flags |= TCQ_F_MQROOT;
68 return 0;
69
70err:
71 mq_destroy(sch);
72 return -ENOMEM;
73}
74
75static void mq_attach(struct Qdisc *sch)
76{
77 struct net_device *dev = qdisc_dev(sch);
78 struct mq_sched *priv = qdisc_priv(sch);
79 struct Qdisc *qdisc;
80 unsigned int ntx;
81
82 for (ntx = 0; ntx < dev->num_tx_queues; ntx++) {
83 qdisc = priv->qdiscs[ntx];
84 qdisc = dev_graft_qdisc(qdisc->dev_queue, qdisc);
85 if (qdisc)
86 qdisc_destroy(qdisc);
87 }
88 kfree(priv->qdiscs);
89 priv->qdiscs = NULL;
90}
91
92static int mq_dump(struct Qdisc *sch, struct sk_buff *skb)
93{
94 struct net_device *dev = qdisc_dev(sch);
95 struct Qdisc *qdisc;
96 unsigned int ntx;
97
98 sch->q.qlen = 0;
99 memset(&sch->bstats, 0, sizeof(sch->bstats));
100 memset(&sch->qstats, 0, sizeof(sch->qstats));
101
102 for (ntx = 0; ntx < dev->num_tx_queues; ntx++) {
103 qdisc = netdev_get_tx_queue(dev, ntx)->qdisc_sleeping;
104 spin_lock_bh(qdisc_lock(qdisc));
105 sch->q.qlen += qdisc->q.qlen;
106 sch->bstats.bytes += qdisc->bstats.bytes;
107 sch->bstats.packets += qdisc->bstats.packets;
108 sch->qstats.qlen += qdisc->qstats.qlen;
109 sch->qstats.backlog += qdisc->qstats.backlog;
110 sch->qstats.drops += qdisc->qstats.drops;
111 sch->qstats.requeues += qdisc->qstats.requeues;
112 sch->qstats.overlimits += qdisc->qstats.overlimits;
113 spin_unlock_bh(qdisc_lock(qdisc));
114 }
115 return 0;
116}
117
118static struct netdev_queue *mq_queue_get(struct Qdisc *sch, unsigned long cl)
119{
120 struct net_device *dev = qdisc_dev(sch);
121 unsigned long ntx = cl - 1;
122
123 if (ntx >= dev->num_tx_queues)
124 return NULL;
125 return netdev_get_tx_queue(dev, ntx);
126}
127
128static struct netdev_queue *mq_select_queue(struct Qdisc *sch,
129 struct tcmsg *tcm)
130{
131 unsigned int ntx = TC_H_MIN(tcm->tcm_parent);
132 struct netdev_queue *dev_queue = mq_queue_get(sch, ntx);
133
134 if (!dev_queue) {
135 struct net_device *dev = qdisc_dev(sch);
136
137 return netdev_get_tx_queue(dev, 0);
138 }
139 return dev_queue;
140}
141
142static int mq_graft(struct Qdisc *sch, unsigned long cl, struct Qdisc *new,
143 struct Qdisc **old)
144{
145 struct netdev_queue *dev_queue = mq_queue_get(sch, cl);
146 struct net_device *dev = qdisc_dev(sch);
147
148 if (dev->flags & IFF_UP)
149 dev_deactivate(dev);
150
151 *old = dev_graft_qdisc(dev_queue, new);
152
153 if (dev->flags & IFF_UP)
154 dev_activate(dev);
155 return 0;
156}
157
158static struct Qdisc *mq_leaf(struct Qdisc *sch, unsigned long cl)
159{
160 struct netdev_queue *dev_queue = mq_queue_get(sch, cl);
161
162 return dev_queue->qdisc_sleeping;
163}
164
165static unsigned long mq_get(struct Qdisc *sch, u32 classid)
166{
167 unsigned int ntx = TC_H_MIN(classid);
168
169 if (!mq_queue_get(sch, ntx))
170 return 0;
171 return ntx;
172}
173
174static void mq_put(struct Qdisc *sch, unsigned long cl)
175{
176}
177
178static int mq_dump_class(struct Qdisc *sch, unsigned long cl,
179 struct sk_buff *skb, struct tcmsg *tcm)
180{
181 struct netdev_queue *dev_queue = mq_queue_get(sch, cl);
182
183 tcm->tcm_parent = TC_H_ROOT;
184 tcm->tcm_handle |= TC_H_MIN(cl);
185 tcm->tcm_info = dev_queue->qdisc_sleeping->handle;
186 return 0;
187}
188
189static int mq_dump_class_stats(struct Qdisc *sch, unsigned long cl,
190 struct gnet_dump *d)
191{
192 struct netdev_queue *dev_queue = mq_queue_get(sch, cl);
193
194 sch = dev_queue->qdisc_sleeping;
195 sch->qstats.qlen = sch->q.qlen;
196 if (gnet_stats_copy_basic(d, &sch->bstats) < 0 ||
197 gnet_stats_copy_queue(d, &sch->qstats) < 0)
198 return -1;
199 return 0;
200}
201
202static void mq_walk(struct Qdisc *sch, struct qdisc_walker *arg)
203{
204 struct net_device *dev = qdisc_dev(sch);
205 unsigned int ntx;
206
207 if (arg->stop)
208 return;
209
210 arg->count = arg->skip;
211 for (ntx = arg->skip; ntx < dev->num_tx_queues; ntx++) {
212 if (arg->fn(sch, ntx + 1, arg) < 0) {
213 arg->stop = 1;
214 break;
215 }
216 arg->count++;
217 }
218}
219
220static const struct Qdisc_class_ops mq_class_ops = {
221 .select_queue = mq_select_queue,
222 .graft = mq_graft,
223 .leaf = mq_leaf,
224 .get = mq_get,
225 .put = mq_put,
226 .walk = mq_walk,
227 .dump = mq_dump_class,
228 .dump_stats = mq_dump_class_stats,
229};
230
231struct Qdisc_ops mq_qdisc_ops __read_mostly = {
232 .cl_ops = &mq_class_ops,
233 .id = "mq",
234 .priv_size = sizeof(struct mq_sched),
235 .init = mq_init,
236 .destroy = mq_destroy,
237 .attach = mq_attach,
238 .dump = mq_dump,
239 .owner = THIS_MODULE,
240};