mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-30 08:02:30 +00:00
ac5c66f261
This reverts commit aebe4426cc
.
Signed-off-by: Petr Machata <petrm@mellanox.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
444 lines
9.7 KiB
C
444 lines
9.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* net/sched/sch_prio.c Simple 3-band priority "scheduler".
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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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#include <net/pkt_cls.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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struct tcf_block *block;
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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 = tcf_classify(skb, fl, &res, false);
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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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case TC_ACT_TRAP:
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*qerr = NET_XMIT_SUCCESS | __NET_XMIT_STOLEN;
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fallthrough;
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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, struct sk_buff **to_free)
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{
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unsigned int len = qdisc_pkt_len(skb);
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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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__qdisc_drop(skb, to_free);
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return ret;
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}
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#endif
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ret = qdisc_enqueue(skb, qdisc, to_free);
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if (ret == NET_XMIT_SUCCESS) {
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sch->qstats.backlog += len;
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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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qdisc_qstats_backlog_dec(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 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->qstats.backlog = 0;
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sch->q.qlen = 0;
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}
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static int prio_offload(struct Qdisc *sch, struct tc_prio_qopt *qopt)
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{
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struct net_device *dev = qdisc_dev(sch);
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struct tc_prio_qopt_offload opt = {
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.handle = sch->handle,
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.parent = sch->parent,
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};
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if (!tc_can_offload(dev) || !dev->netdev_ops->ndo_setup_tc)
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return -EOPNOTSUPP;
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if (qopt) {
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opt.command = TC_PRIO_REPLACE;
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opt.replace_params.bands = qopt->bands;
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memcpy(&opt.replace_params.priomap, qopt->priomap,
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TC_PRIO_MAX + 1);
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opt.replace_params.qstats = &sch->qstats;
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} else {
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opt.command = TC_PRIO_DESTROY;
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}
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return dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_QDISC_PRIO, &opt);
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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_block_put(q->block);
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prio_offload(sch, NULL);
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for (prio = 0; prio < q->bands; prio++)
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qdisc_put(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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struct netlink_ext_ack *extack)
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{
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struct prio_sched_data *q = qdisc_priv(sch);
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struct Qdisc *queues[TCQ_PRIO_BANDS];
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int oldbands = q->bands, i;
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struct tc_prio_qopt *qopt;
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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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/* Before commit, make sure we can allocate all new qdiscs */
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for (i = oldbands; i < qopt->bands; i++) {
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queues[i] = qdisc_create_dflt(sch->dev_queue, &pfifo_qdisc_ops,
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TC_H_MAKE(sch->handle, i + 1),
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extack);
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if (!queues[i]) {
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while (i > oldbands)
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qdisc_put(queues[--i]);
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return -ENOMEM;
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}
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}
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prio_offload(sch, qopt);
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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 < oldbands; i++)
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qdisc_tree_flush_backlog(q->queues[i]);
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for (i = oldbands; i < q->bands; i++) {
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q->queues[i] = queues[i];
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if (q->queues[i] != &noop_qdisc)
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qdisc_hash_add(q->queues[i], true);
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}
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sch_tree_unlock(sch);
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for (i = q->bands; i < oldbands; i++)
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qdisc_put(q->queues[i]);
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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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struct netlink_ext_ack *extack)
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{
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struct prio_sched_data *q = qdisc_priv(sch);
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int err;
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if (!opt)
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return -EINVAL;
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err = tcf_block_get(&q->block, &q->filter_list, sch, extack);
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if (err)
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return err;
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return prio_tune(sch, opt, extack);
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}
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static int prio_dump_offload(struct Qdisc *sch)
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{
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struct tc_prio_qopt_offload hw_stats = {
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.command = TC_PRIO_STATS,
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.handle = sch->handle,
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.parent = sch->parent,
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{
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.stats = {
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.bstats = &sch->bstats,
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.qstats = &sch->qstats,
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},
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},
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};
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return qdisc_offload_dump_helper(sch, TC_SETUP_QDISC_PRIO, &hw_stats);
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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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int err;
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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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err = prio_dump_offload(sch);
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if (err)
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goto nla_put_failure;
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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, struct netlink_ext_ack *extack)
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{
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struct prio_sched_data *q = qdisc_priv(sch);
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struct tc_prio_qopt_offload graft_offload;
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unsigned long band = arg - 1;
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if (!new) {
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new = qdisc_create_dflt(sch->dev_queue, &pfifo_qdisc_ops,
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TC_H_MAKE(sch->handle, arg), extack);
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if (!new)
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new = &noop_qdisc;
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else
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qdisc_hash_add(new, true);
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}
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*old = qdisc_replace(sch, new, &q->queues[band]);
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graft_offload.handle = sch->handle;
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graft_offload.parent = sch->parent;
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graft_offload.graft_params.band = band;
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graft_offload.graft_params.child_handle = new->handle;
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graft_offload.command = TC_PRIO_GRAFT;
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qdisc_offload_graft_helper(qdisc_dev(sch), sch, new, *old,
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TC_SETUP_QDISC_PRIO, &graft_offload,
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extack);
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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_find(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_find(sch, classid);
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}
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static void prio_unbind(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(qdisc_root_sleeping_running(sch),
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d, cl_q->cpu_bstats, &cl_q->bstats) < 0 ||
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qdisc_qstats_copy(d, cl_q) < 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_block *prio_tcf_block(struct Qdisc *sch, unsigned long cl,
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struct netlink_ext_ack *extack)
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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->block;
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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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.find = prio_find,
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.walk = prio_walk,
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.tcf_block = prio_tcf_block,
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.bind_tcf = prio_bind,
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.unbind_tcf = prio_unbind,
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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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.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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