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508 lines
11 KiB
508 lines
11 KiB
// 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 <[email protected]> |
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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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unsigned int filter_cnt; |
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struct gnet_stats_basic_packed 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, |
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qdisc_root_sleeping_running(sch), |
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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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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, |
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qdisc_root_sleeping_running(sch), |
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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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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 (cl->filter_cnt > 0) |
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return -EBUSY; |
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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 != NULL) |
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cl->filter_cnt++; |
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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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cl->filter_cnt--; |
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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(qdisc_root_sleeping_running(sch), |
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d, NULL, &cl->bstats) < 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 (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, (unsigned long)cl, arg) < 0) { |
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arg->stop = 1; |
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return; |
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} |
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arg->count++; |
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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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sch->qstats.backlog = 0; |
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sch->q.qlen = 0; |
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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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