2 * net/sched/sch_mq.c Classful multiqueue dummy scheduler
4 * Copyright (c) 2009 Patrick McHardy <kaber@trash.net>
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.
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>
22 struct Qdisc **qdiscs;
25 static void mq_destroy(struct Qdisc *sch)
27 struct net_device *dev = qdisc_dev(sch);
28 struct mq_sched *priv = qdisc_priv(sch);
33 for (ntx = 0; ntx < dev->num_tx_queues && priv->qdiscs[ntx]; ntx++)
34 qdisc_destroy(priv->qdiscs[ntx]);
38 static int mq_init(struct Qdisc *sch, struct nlattr *opt)
40 struct net_device *dev = qdisc_dev(sch);
41 struct mq_sched *priv = qdisc_priv(sch);
42 struct netdev_queue *dev_queue;
46 if (sch->parent != TC_H_ROOT)
49 if (!netif_is_multiqueue(dev))
52 /* pre-allocate qdiscs, attachment can't fail */
53 priv->qdiscs = kcalloc(dev->num_tx_queues, sizeof(priv->qdiscs[0]),
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, &pfifo_fast_ops,
61 TC_H_MAKE(TC_H_MAJ(sch->handle),
65 priv->qdiscs[ntx] = qdisc;
68 sch->flags |= TCQ_F_MQROOT;
72 static void mq_attach(struct Qdisc *sch)
74 struct net_device *dev = qdisc_dev(sch);
75 struct mq_sched *priv = qdisc_priv(sch);
79 for (ntx = 0; ntx < dev->num_tx_queues; ntx++) {
80 qdisc = priv->qdiscs[ntx];
81 qdisc = dev_graft_qdisc(qdisc->dev_queue, qdisc);
89 static int mq_dump(struct Qdisc *sch, struct sk_buff *skb)
91 struct net_device *dev = qdisc_dev(sch);
96 memset(&sch->bstats, 0, sizeof(sch->bstats));
97 memset(&sch->qstats, 0, sizeof(sch->qstats));
99 for (ntx = 0; ntx < dev->num_tx_queues; ntx++) {
100 qdisc = netdev_get_tx_queue(dev, ntx)->qdisc_sleeping;
101 spin_lock_bh(qdisc_lock(qdisc));
102 sch->q.qlen += qdisc->q.qlen;
103 sch->bstats.bytes += qdisc->bstats.bytes;
104 sch->bstats.packets += qdisc->bstats.packets;
105 sch->qstats.qlen += qdisc->qstats.qlen;
106 sch->qstats.backlog += qdisc->qstats.backlog;
107 sch->qstats.drops += qdisc->qstats.drops;
108 sch->qstats.requeues += qdisc->qstats.requeues;
109 sch->qstats.overlimits += qdisc->qstats.overlimits;
110 spin_unlock_bh(qdisc_lock(qdisc));
115 static struct netdev_queue *mq_queue_get(struct Qdisc *sch, unsigned long cl)
117 struct net_device *dev = qdisc_dev(sch);
118 unsigned long ntx = cl - 1;
120 if (ntx >= dev->num_tx_queues)
122 return netdev_get_tx_queue(dev, ntx);
125 static struct netdev_queue *mq_select_queue(struct Qdisc *sch,
128 unsigned int ntx = TC_H_MIN(tcm->tcm_parent);
129 struct netdev_queue *dev_queue = mq_queue_get(sch, ntx);
132 struct net_device *dev = qdisc_dev(sch);
134 return netdev_get_tx_queue(dev, 0);
139 static int mq_graft(struct Qdisc *sch, unsigned long cl, struct Qdisc *new,
142 struct netdev_queue *dev_queue = mq_queue_get(sch, cl);
143 struct net_device *dev = qdisc_dev(sch);
145 if (dev->flags & IFF_UP)
148 *old = dev_graft_qdisc(dev_queue, new);
150 if (dev->flags & IFF_UP)
155 static struct Qdisc *mq_leaf(struct Qdisc *sch, unsigned long cl)
157 struct netdev_queue *dev_queue = mq_queue_get(sch, cl);
159 return dev_queue->qdisc_sleeping;
162 static unsigned long mq_get(struct Qdisc *sch, u32 classid)
164 unsigned int ntx = TC_H_MIN(classid);
166 if (!mq_queue_get(sch, ntx))
171 static void mq_put(struct Qdisc *sch, unsigned long cl)
175 static int mq_dump_class(struct Qdisc *sch, unsigned long cl,
176 struct sk_buff *skb, struct tcmsg *tcm)
178 struct netdev_queue *dev_queue = mq_queue_get(sch, cl);
180 tcm->tcm_parent = TC_H_ROOT;
181 tcm->tcm_handle |= TC_H_MIN(cl);
182 tcm->tcm_info = dev_queue->qdisc_sleeping->handle;
186 static int mq_dump_class_stats(struct Qdisc *sch, unsigned long cl,
189 struct netdev_queue *dev_queue = mq_queue_get(sch, cl);
191 sch = dev_queue->qdisc_sleeping;
192 sch->qstats.qlen = sch->q.qlen;
193 if (gnet_stats_copy_basic(d, &sch->bstats) < 0 ||
194 gnet_stats_copy_queue(d, &sch->qstats) < 0)
199 static void mq_walk(struct Qdisc *sch, struct qdisc_walker *arg)
201 struct net_device *dev = qdisc_dev(sch);
207 arg->count = arg->skip;
208 for (ntx = arg->skip; ntx < dev->num_tx_queues; ntx++) {
209 if (arg->fn(sch, ntx + 1, arg) < 0) {
217 static const struct Qdisc_class_ops mq_class_ops = {
218 .select_queue = mq_select_queue,
224 .dump = mq_dump_class,
225 .dump_stats = mq_dump_class_stats,
228 struct Qdisc_ops mq_qdisc_ops __read_mostly = {
229 .cl_ops = &mq_class_ops,
231 .priv_size = sizeof(struct mq_sched),
233 .destroy = mq_destroy,
236 .owner = THIS_MODULE,