409 строки
8.4 KiB
C
409 строки
8.4 KiB
C
/*
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* net/sched/sch_prio.c Simple 3-band priority "scheduler".
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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* Fixes: 19990609: J Hadi Salim <hadi@nortelnetworks.com>:
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* Init -- EINVAL when opt undefined
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/skbuff.h>
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#include <net/netlink.h>
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#include <net/pkt_sched.h>
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struct prio_sched_data {
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int bands;
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struct tcf_proto __rcu *filter_list;
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u8 prio2band[TC_PRIO_MAX+1];
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struct Qdisc *queues[TCQ_PRIO_BANDS];
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};
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static struct Qdisc *
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prio_classify(struct sk_buff *skb, struct Qdisc *sch, int *qerr)
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{
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struct prio_sched_data *q = qdisc_priv(sch);
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u32 band = skb->priority;
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struct tcf_result res;
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struct tcf_proto *fl;
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int err;
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*qerr = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
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if (TC_H_MAJ(skb->priority) != sch->handle) {
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fl = rcu_dereference_bh(q->filter_list);
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err = tc_classify(skb, fl, &res);
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#ifdef CONFIG_NET_CLS_ACT
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switch (err) {
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case TC_ACT_STOLEN:
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case TC_ACT_QUEUED:
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*qerr = NET_XMIT_SUCCESS | __NET_XMIT_STOLEN;
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case TC_ACT_SHOT:
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return NULL;
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}
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#endif
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if (!fl || err < 0) {
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if (TC_H_MAJ(band))
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band = 0;
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return q->queues[q->prio2band[band & TC_PRIO_MAX]];
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}
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band = res.classid;
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}
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band = TC_H_MIN(band) - 1;
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if (band >= q->bands)
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return q->queues[q->prio2band[0]];
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return q->queues[band];
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}
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static int
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prio_enqueue(struct sk_buff *skb, struct Qdisc *sch)
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{
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struct Qdisc *qdisc;
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int ret;
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qdisc = prio_classify(skb, sch, &ret);
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#ifdef CONFIG_NET_CLS_ACT
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if (qdisc == NULL) {
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if (ret & __NET_XMIT_BYPASS)
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qdisc_qstats_drop(sch);
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kfree_skb(skb);
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return ret;
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}
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#endif
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ret = qdisc_enqueue(skb, qdisc);
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if (ret == NET_XMIT_SUCCESS) {
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sch->q.qlen++;
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return NET_XMIT_SUCCESS;
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}
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if (net_xmit_drop_count(ret))
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qdisc_qstats_drop(sch);
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return ret;
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}
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static struct sk_buff *prio_peek(struct Qdisc *sch)
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{
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struct prio_sched_data *q = qdisc_priv(sch);
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int prio;
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for (prio = 0; prio < q->bands; prio++) {
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struct Qdisc *qdisc = q->queues[prio];
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struct sk_buff *skb = qdisc->ops->peek(qdisc);
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if (skb)
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return skb;
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}
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return NULL;
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}
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static struct sk_buff *prio_dequeue(struct Qdisc *sch)
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{
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struct prio_sched_data *q = qdisc_priv(sch);
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int prio;
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for (prio = 0; prio < q->bands; prio++) {
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struct Qdisc *qdisc = q->queues[prio];
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struct sk_buff *skb = qdisc_dequeue_peeked(qdisc);
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if (skb) {
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qdisc_bstats_update(sch, skb);
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sch->q.qlen--;
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return skb;
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}
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}
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return NULL;
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}
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static unsigned int prio_drop(struct Qdisc *sch)
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{
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struct prio_sched_data *q = qdisc_priv(sch);
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int prio;
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unsigned int len;
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struct Qdisc *qdisc;
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for (prio = q->bands-1; prio >= 0; prio--) {
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qdisc = q->queues[prio];
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if (qdisc->ops->drop && (len = qdisc->ops->drop(qdisc)) != 0) {
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sch->q.qlen--;
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return len;
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}
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}
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return 0;
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}
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static void
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prio_reset(struct Qdisc *sch)
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{
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int prio;
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struct prio_sched_data *q = qdisc_priv(sch);
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for (prio = 0; prio < q->bands; prio++)
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qdisc_reset(q->queues[prio]);
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sch->q.qlen = 0;
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}
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static void
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prio_destroy(struct Qdisc *sch)
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{
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int prio;
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struct prio_sched_data *q = qdisc_priv(sch);
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tcf_destroy_chain(&q->filter_list);
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for (prio = 0; prio < q->bands; prio++)
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qdisc_destroy(q->queues[prio]);
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}
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static int prio_tune(struct Qdisc *sch, struct nlattr *opt)
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{
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struct prio_sched_data *q = qdisc_priv(sch);
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struct tc_prio_qopt *qopt;
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int i;
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if (nla_len(opt) < sizeof(*qopt))
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return -EINVAL;
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qopt = nla_data(opt);
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if (qopt->bands > TCQ_PRIO_BANDS || qopt->bands < 2)
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return -EINVAL;
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for (i = 0; i <= TC_PRIO_MAX; i++) {
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if (qopt->priomap[i] >= qopt->bands)
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return -EINVAL;
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}
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sch_tree_lock(sch);
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q->bands = qopt->bands;
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memcpy(q->prio2band, qopt->priomap, TC_PRIO_MAX+1);
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for (i = q->bands; i < TCQ_PRIO_BANDS; i++) {
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struct Qdisc *child = q->queues[i];
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q->queues[i] = &noop_qdisc;
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if (child != &noop_qdisc) {
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qdisc_tree_decrease_qlen(child, child->q.qlen);
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qdisc_destroy(child);
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}
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}
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sch_tree_unlock(sch);
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for (i = 0; i < q->bands; i++) {
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if (q->queues[i] == &noop_qdisc) {
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struct Qdisc *child, *old;
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child = qdisc_create_dflt(sch->dev_queue,
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&pfifo_qdisc_ops,
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TC_H_MAKE(sch->handle, i + 1));
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if (child) {
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sch_tree_lock(sch);
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old = q->queues[i];
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q->queues[i] = child;
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if (old != &noop_qdisc) {
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qdisc_tree_decrease_qlen(old,
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old->q.qlen);
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qdisc_destroy(old);
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}
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sch_tree_unlock(sch);
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}
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}
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}
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return 0;
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}
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static int prio_init(struct Qdisc *sch, struct nlattr *opt)
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{
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struct prio_sched_data *q = qdisc_priv(sch);
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int i;
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for (i = 0; i < TCQ_PRIO_BANDS; i++)
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q->queues[i] = &noop_qdisc;
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if (opt == NULL) {
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return -EINVAL;
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} else {
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int err;
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if ((err = prio_tune(sch, opt)) != 0)
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return err;
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}
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return 0;
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}
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static int prio_dump(struct Qdisc *sch, struct sk_buff *skb)
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{
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struct prio_sched_data *q = qdisc_priv(sch);
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unsigned char *b = skb_tail_pointer(skb);
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struct tc_prio_qopt opt;
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opt.bands = q->bands;
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memcpy(&opt.priomap, q->prio2band, TC_PRIO_MAX + 1);
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if (nla_put(skb, TCA_OPTIONS, sizeof(opt), &opt))
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goto nla_put_failure;
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return skb->len;
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nla_put_failure:
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nlmsg_trim(skb, b);
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return -1;
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}
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static int prio_graft(struct Qdisc *sch, unsigned long arg, struct Qdisc *new,
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struct Qdisc **old)
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{
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struct prio_sched_data *q = qdisc_priv(sch);
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unsigned long band = arg - 1;
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if (new == NULL)
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new = &noop_qdisc;
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sch_tree_lock(sch);
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*old = q->queues[band];
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q->queues[band] = new;
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qdisc_tree_decrease_qlen(*old, (*old)->q.qlen);
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qdisc_reset(*old);
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sch_tree_unlock(sch);
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return 0;
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}
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static struct Qdisc *
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prio_leaf(struct Qdisc *sch, unsigned long arg)
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{
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struct prio_sched_data *q = qdisc_priv(sch);
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unsigned long band = arg - 1;
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return q->queues[band];
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}
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static unsigned long prio_get(struct Qdisc *sch, u32 classid)
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{
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struct prio_sched_data *q = qdisc_priv(sch);
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unsigned long band = TC_H_MIN(classid);
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if (band - 1 >= q->bands)
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return 0;
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return band;
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}
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static unsigned long prio_bind(struct Qdisc *sch, unsigned long parent, u32 classid)
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{
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return prio_get(sch, classid);
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}
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static void prio_put(struct Qdisc *q, unsigned long cl)
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{
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}
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static int prio_dump_class(struct Qdisc *sch, unsigned long cl, struct sk_buff *skb,
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struct tcmsg *tcm)
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{
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struct prio_sched_data *q = qdisc_priv(sch);
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tcm->tcm_handle |= TC_H_MIN(cl);
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tcm->tcm_info = q->queues[cl-1]->handle;
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return 0;
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}
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static int prio_dump_class_stats(struct Qdisc *sch, unsigned long cl,
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struct gnet_dump *d)
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{
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struct prio_sched_data *q = qdisc_priv(sch);
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struct Qdisc *cl_q;
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cl_q = q->queues[cl - 1];
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if (gnet_stats_copy_basic(d, NULL, &cl_q->bstats) < 0 ||
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gnet_stats_copy_queue(d, NULL, &cl_q->qstats, cl_q->q.qlen) < 0)
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return -1;
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return 0;
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}
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static void prio_walk(struct Qdisc *sch, struct qdisc_walker *arg)
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{
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struct prio_sched_data *q = qdisc_priv(sch);
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int prio;
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if (arg->stop)
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return;
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for (prio = 0; prio < q->bands; prio++) {
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if (arg->count < arg->skip) {
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arg->count++;
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continue;
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}
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if (arg->fn(sch, prio + 1, arg) < 0) {
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arg->stop = 1;
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break;
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}
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arg->count++;
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}
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}
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static struct tcf_proto __rcu **prio_find_tcf(struct Qdisc *sch,
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unsigned long cl)
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{
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struct prio_sched_data *q = qdisc_priv(sch);
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if (cl)
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return NULL;
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return &q->filter_list;
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}
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static const struct Qdisc_class_ops prio_class_ops = {
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.graft = prio_graft,
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.leaf = prio_leaf,
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.get = prio_get,
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.put = prio_put,
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.walk = prio_walk,
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.tcf_chain = prio_find_tcf,
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.bind_tcf = prio_bind,
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.unbind_tcf = prio_put,
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.dump = prio_dump_class,
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.dump_stats = prio_dump_class_stats,
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};
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static struct Qdisc_ops prio_qdisc_ops __read_mostly = {
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.next = NULL,
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.cl_ops = &prio_class_ops,
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.id = "prio",
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.priv_size = sizeof(struct prio_sched_data),
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.enqueue = prio_enqueue,
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.dequeue = prio_dequeue,
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.peek = prio_peek,
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.drop = prio_drop,
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.init = prio_init,
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.reset = prio_reset,
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.destroy = prio_destroy,
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.change = prio_tune,
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.dump = prio_dump,
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.owner = THIS_MODULE,
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};
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static int __init prio_module_init(void)
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{
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return register_qdisc(&prio_qdisc_ops);
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}
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static void __exit prio_module_exit(void)
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{
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unregister_qdisc(&prio_qdisc_ops);
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}
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module_init(prio_module_init)
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module_exit(prio_module_exit)
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MODULE_LICENSE("GPL");
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