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![Pedro Tammela](/assets/img/avatar_default.png)
Add extack to warn that delete was rejected because the class is still in use Acked-by: Jamal Hadi Salim <jhs@mojatatu.com> Signed-off-by: Pedro Tammela <pctammela@mojatatu.com> Reviewed-by: Simon Horman <horms@kernel.org> Signed-off-by: Paolo Abeni <pabeni@redhat.com>
497 lines
11 KiB
C
497 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* net/sched/sch_drr.c Deficit Round Robin scheduler
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*
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* Copyright (c) 2008 Patrick McHardy <kaber@trash.net>
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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/init.h>
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#include <linux/errno.h>
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#include <linux/netdevice.h>
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#include <linux/pkt_sched.h>
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#include <net/sch_generic.h>
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#include <net/pkt_sched.h>
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#include <net/pkt_cls.h>
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struct drr_class {
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struct Qdisc_class_common common;
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struct gnet_stats_basic_sync bstats;
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struct gnet_stats_queue qstats;
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struct net_rate_estimator __rcu *rate_est;
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struct list_head alist;
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struct Qdisc *qdisc;
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u32 quantum;
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u32 deficit;
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};
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struct drr_sched {
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struct list_head active;
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struct tcf_proto __rcu *filter_list;
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struct tcf_block *block;
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struct Qdisc_class_hash clhash;
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};
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static struct drr_class *drr_find_class(struct Qdisc *sch, u32 classid)
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{
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struct drr_sched *q = qdisc_priv(sch);
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struct Qdisc_class_common *clc;
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clc = qdisc_class_find(&q->clhash, classid);
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if (clc == NULL)
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return NULL;
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return container_of(clc, struct drr_class, common);
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}
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static const struct nla_policy drr_policy[TCA_DRR_MAX + 1] = {
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[TCA_DRR_QUANTUM] = { .type = NLA_U32 },
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};
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static int drr_change_class(struct Qdisc *sch, u32 classid, u32 parentid,
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struct nlattr **tca, unsigned long *arg,
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struct netlink_ext_ack *extack)
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{
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struct drr_sched *q = qdisc_priv(sch);
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struct drr_class *cl = (struct drr_class *)*arg;
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struct nlattr *opt = tca[TCA_OPTIONS];
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struct nlattr *tb[TCA_DRR_MAX + 1];
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u32 quantum;
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int err;
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if (!opt) {
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NL_SET_ERR_MSG(extack, "DRR options are required for this operation");
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return -EINVAL;
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}
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err = nla_parse_nested_deprecated(tb, TCA_DRR_MAX, opt, drr_policy,
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extack);
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if (err < 0)
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return err;
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if (tb[TCA_DRR_QUANTUM]) {
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quantum = nla_get_u32(tb[TCA_DRR_QUANTUM]);
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if (quantum == 0) {
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NL_SET_ERR_MSG(extack, "Specified DRR quantum cannot be zero");
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return -EINVAL;
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}
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} else
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quantum = psched_mtu(qdisc_dev(sch));
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if (cl != NULL) {
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if (tca[TCA_RATE]) {
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err = gen_replace_estimator(&cl->bstats, NULL,
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&cl->rate_est,
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NULL, true,
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tca[TCA_RATE]);
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if (err) {
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NL_SET_ERR_MSG(extack, "Failed to replace estimator");
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return err;
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}
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}
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sch_tree_lock(sch);
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if (tb[TCA_DRR_QUANTUM])
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cl->quantum = quantum;
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sch_tree_unlock(sch);
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return 0;
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}
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cl = kzalloc(sizeof(struct drr_class), GFP_KERNEL);
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if (cl == NULL)
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return -ENOBUFS;
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gnet_stats_basic_sync_init(&cl->bstats);
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cl->common.classid = classid;
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cl->quantum = quantum;
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cl->qdisc = qdisc_create_dflt(sch->dev_queue,
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&pfifo_qdisc_ops, classid,
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NULL);
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if (cl->qdisc == NULL)
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cl->qdisc = &noop_qdisc;
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else
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qdisc_hash_add(cl->qdisc, true);
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if (tca[TCA_RATE]) {
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err = gen_replace_estimator(&cl->bstats, NULL, &cl->rate_est,
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NULL, true, tca[TCA_RATE]);
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if (err) {
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NL_SET_ERR_MSG(extack, "Failed to replace estimator");
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qdisc_put(cl->qdisc);
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kfree(cl);
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return err;
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}
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}
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sch_tree_lock(sch);
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qdisc_class_hash_insert(&q->clhash, &cl->common);
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sch_tree_unlock(sch);
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qdisc_class_hash_grow(sch, &q->clhash);
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*arg = (unsigned long)cl;
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return 0;
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}
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static void drr_destroy_class(struct Qdisc *sch, struct drr_class *cl)
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{
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gen_kill_estimator(&cl->rate_est);
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qdisc_put(cl->qdisc);
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kfree(cl);
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}
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static int drr_delete_class(struct Qdisc *sch, unsigned long arg,
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struct netlink_ext_ack *extack)
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{
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struct drr_sched *q = qdisc_priv(sch);
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struct drr_class *cl = (struct drr_class *)arg;
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if (qdisc_class_in_use(&cl->common)) {
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NL_SET_ERR_MSG(extack, "DRR class is in use");
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return -EBUSY;
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}
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sch_tree_lock(sch);
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qdisc_purge_queue(cl->qdisc);
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qdisc_class_hash_remove(&q->clhash, &cl->common);
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sch_tree_unlock(sch);
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drr_destroy_class(sch, cl);
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return 0;
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}
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static unsigned long drr_search_class(struct Qdisc *sch, u32 classid)
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{
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return (unsigned long)drr_find_class(sch, classid);
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}
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static struct tcf_block *drr_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 drr_sched *q = qdisc_priv(sch);
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if (cl) {
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NL_SET_ERR_MSG(extack, "DRR classid must be zero");
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return NULL;
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}
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return q->block;
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}
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static unsigned long drr_bind_tcf(struct Qdisc *sch, unsigned long parent,
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u32 classid)
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{
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struct drr_class *cl = drr_find_class(sch, classid);
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if (cl)
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qdisc_class_get(&cl->common);
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return (unsigned long)cl;
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}
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static void drr_unbind_tcf(struct Qdisc *sch, unsigned long arg)
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{
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struct drr_class *cl = (struct drr_class *)arg;
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qdisc_class_put(&cl->common);
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}
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static int drr_graft_class(struct Qdisc *sch, unsigned long arg,
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struct Qdisc *new, struct Qdisc **old,
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struct netlink_ext_ack *extack)
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{
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struct drr_class *cl = (struct drr_class *)arg;
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if (new == NULL) {
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new = qdisc_create_dflt(sch->dev_queue, &pfifo_qdisc_ops,
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cl->common.classid, NULL);
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if (new == NULL)
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new = &noop_qdisc;
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}
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*old = qdisc_replace(sch, new, &cl->qdisc);
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return 0;
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}
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static struct Qdisc *drr_class_leaf(struct Qdisc *sch, unsigned long arg)
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{
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struct drr_class *cl = (struct drr_class *)arg;
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return cl->qdisc;
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}
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static void drr_qlen_notify(struct Qdisc *csh, unsigned long arg)
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{
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struct drr_class *cl = (struct drr_class *)arg;
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list_del(&cl->alist);
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}
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static int drr_dump_class(struct Qdisc *sch, unsigned long arg,
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struct sk_buff *skb, struct tcmsg *tcm)
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{
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struct drr_class *cl = (struct drr_class *)arg;
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struct nlattr *nest;
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tcm->tcm_parent = TC_H_ROOT;
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tcm->tcm_handle = cl->common.classid;
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tcm->tcm_info = cl->qdisc->handle;
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nest = nla_nest_start_noflag(skb, TCA_OPTIONS);
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if (nest == NULL)
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goto nla_put_failure;
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if (nla_put_u32(skb, TCA_DRR_QUANTUM, cl->quantum))
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goto nla_put_failure;
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return nla_nest_end(skb, nest);
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nla_put_failure:
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nla_nest_cancel(skb, nest);
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return -EMSGSIZE;
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}
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static int drr_dump_class_stats(struct Qdisc *sch, unsigned long arg,
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struct gnet_dump *d)
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{
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struct drr_class *cl = (struct drr_class *)arg;
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__u32 qlen = qdisc_qlen_sum(cl->qdisc);
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struct Qdisc *cl_q = cl->qdisc;
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struct tc_drr_stats xstats;
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memset(&xstats, 0, sizeof(xstats));
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if (qlen)
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xstats.deficit = cl->deficit;
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if (gnet_stats_copy_basic(d, NULL, &cl->bstats, true) < 0 ||
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gnet_stats_copy_rate_est(d, &cl->rate_est) < 0 ||
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gnet_stats_copy_queue(d, cl_q->cpu_qstats, &cl_q->qstats, qlen) < 0)
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return -1;
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return gnet_stats_copy_app(d, &xstats, sizeof(xstats));
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}
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static void drr_walk(struct Qdisc *sch, struct qdisc_walker *arg)
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{
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struct drr_sched *q = qdisc_priv(sch);
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struct drr_class *cl;
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unsigned int i;
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if (arg->stop)
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return;
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for (i = 0; i < q->clhash.hashsize; i++) {
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hlist_for_each_entry(cl, &q->clhash.hash[i], common.hnode) {
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if (!tc_qdisc_stats_dump(sch, (unsigned long)cl, arg))
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return;
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}
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}
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}
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static struct drr_class *drr_classify(struct sk_buff *skb, struct Qdisc *sch,
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int *qerr)
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{
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struct drr_sched *q = qdisc_priv(sch);
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struct drr_class *cl;
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struct tcf_result res;
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struct tcf_proto *fl;
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int result;
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if (TC_H_MAJ(skb->priority ^ sch->handle) == 0) {
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cl = drr_find_class(sch, skb->priority);
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if (cl != NULL)
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return cl;
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}
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*qerr = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
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fl = rcu_dereference_bh(q->filter_list);
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result = tcf_classify(skb, NULL, fl, &res, false);
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if (result >= 0) {
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#ifdef CONFIG_NET_CLS_ACT
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switch (result) {
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case TC_ACT_QUEUED:
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case TC_ACT_STOLEN:
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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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cl = (struct drr_class *)res.class;
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if (cl == NULL)
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cl = drr_find_class(sch, res.classid);
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return cl;
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}
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return NULL;
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}
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static int drr_enqueue(struct sk_buff *skb, struct Qdisc *sch,
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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 drr_sched *q = qdisc_priv(sch);
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struct drr_class *cl;
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int err = 0;
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bool first;
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cl = drr_classify(skb, sch, &err);
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if (cl == NULL) {
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if (err & __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 err;
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}
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first = !cl->qdisc->q.qlen;
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err = qdisc_enqueue(skb, cl->qdisc, to_free);
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if (unlikely(err != NET_XMIT_SUCCESS)) {
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if (net_xmit_drop_count(err)) {
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cl->qstats.drops++;
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qdisc_qstats_drop(sch);
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}
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return err;
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}
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if (first) {
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list_add_tail(&cl->alist, &q->active);
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cl->deficit = cl->quantum;
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}
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sch->qstats.backlog += len;
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sch->q.qlen++;
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return err;
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}
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static struct sk_buff *drr_dequeue(struct Qdisc *sch)
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{
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struct drr_sched *q = qdisc_priv(sch);
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struct drr_class *cl;
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struct sk_buff *skb;
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unsigned int len;
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if (list_empty(&q->active))
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goto out;
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while (1) {
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cl = list_first_entry(&q->active, struct drr_class, alist);
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skb = cl->qdisc->ops->peek(cl->qdisc);
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if (skb == NULL) {
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qdisc_warn_nonwc(__func__, cl->qdisc);
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goto out;
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}
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len = qdisc_pkt_len(skb);
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if (len <= cl->deficit) {
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cl->deficit -= len;
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skb = qdisc_dequeue_peeked(cl->qdisc);
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if (unlikely(skb == NULL))
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goto out;
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if (cl->qdisc->q.qlen == 0)
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list_del(&cl->alist);
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bstats_update(&cl->bstats, 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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cl->deficit += cl->quantum;
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list_move_tail(&cl->alist, &q->active);
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}
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out:
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return NULL;
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}
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static int drr_init_qdisc(struct Qdisc *sch, struct nlattr *opt,
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struct netlink_ext_ack *extack)
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{
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struct drr_sched *q = qdisc_priv(sch);
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int err;
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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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err = qdisc_class_hash_init(&q->clhash);
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if (err < 0)
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return err;
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INIT_LIST_HEAD(&q->active);
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return 0;
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}
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static void drr_reset_qdisc(struct Qdisc *sch)
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{
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struct drr_sched *q = qdisc_priv(sch);
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struct drr_class *cl;
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unsigned int i;
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for (i = 0; i < q->clhash.hashsize; i++) {
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hlist_for_each_entry(cl, &q->clhash.hash[i], common.hnode) {
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if (cl->qdisc->q.qlen)
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list_del(&cl->alist);
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qdisc_reset(cl->qdisc);
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}
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}
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}
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static void drr_destroy_qdisc(struct Qdisc *sch)
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{
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struct drr_sched *q = qdisc_priv(sch);
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struct drr_class *cl;
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struct hlist_node *next;
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unsigned int i;
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tcf_block_put(q->block);
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for (i = 0; i < q->clhash.hashsize; i++) {
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hlist_for_each_entry_safe(cl, next, &q->clhash.hash[i],
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common.hnode)
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drr_destroy_class(sch, cl);
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}
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qdisc_class_hash_destroy(&q->clhash);
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}
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static const struct Qdisc_class_ops drr_class_ops = {
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.change = drr_change_class,
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.delete = drr_delete_class,
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.find = drr_search_class,
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.tcf_block = drr_tcf_block,
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.bind_tcf = drr_bind_tcf,
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.unbind_tcf = drr_unbind_tcf,
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.graft = drr_graft_class,
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.leaf = drr_class_leaf,
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.qlen_notify = drr_qlen_notify,
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.dump = drr_dump_class,
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.dump_stats = drr_dump_class_stats,
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.walk = drr_walk,
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};
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static struct Qdisc_ops drr_qdisc_ops __read_mostly = {
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.cl_ops = &drr_class_ops,
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.id = "drr",
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.priv_size = sizeof(struct drr_sched),
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.enqueue = drr_enqueue,
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.dequeue = drr_dequeue,
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.peek = qdisc_peek_dequeued,
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.init = drr_init_qdisc,
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.reset = drr_reset_qdisc,
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.destroy = drr_destroy_qdisc,
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.owner = THIS_MODULE,
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};
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static int __init drr_init(void)
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{
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return register_qdisc(&drr_qdisc_ops);
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}
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static void __exit drr_exit(void)
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{
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unregister_qdisc(&drr_qdisc_ops);
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}
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module_init(drr_init);
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module_exit(drr_exit);
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MODULE_LICENSE("GPL");
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