889 lines
21 KiB
C
889 lines
21 KiB
C
#ifndef __NET_SCHED_GENERIC_H
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#define __NET_SCHED_GENERIC_H
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#include <linux/netdevice.h>
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#include <linux/types.h>
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#include <linux/rcupdate.h>
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#include <linux/pkt_sched.h>
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#include <linux/pkt_cls.h>
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#include <linux/percpu.h>
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#include <linux/dynamic_queue_limits.h>
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#include <linux/list.h>
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#include <linux/refcount.h>
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#include <net/gen_stats.h>
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#include <net/rtnetlink.h>
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struct Qdisc_ops;
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struct qdisc_walker;
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struct tcf_walker;
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struct module;
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struct qdisc_rate_table {
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struct tc_ratespec rate;
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u32 data[256];
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struct qdisc_rate_table *next;
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int refcnt;
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};
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enum qdisc_state_t {
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__QDISC_STATE_SCHED,
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__QDISC_STATE_DEACTIVATED,
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};
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struct qdisc_size_table {
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struct rcu_head rcu;
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struct list_head list;
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struct tc_sizespec szopts;
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int refcnt;
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u16 data[];
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};
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/* similar to sk_buff_head, but skb->prev pointer is undefined. */
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struct qdisc_skb_head {
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struct sk_buff *head;
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struct sk_buff *tail;
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__u32 qlen;
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spinlock_t lock;
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};
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struct Qdisc {
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int (*enqueue)(struct sk_buff *skb,
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struct Qdisc *sch,
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struct sk_buff **to_free);
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struct sk_buff * (*dequeue)(struct Qdisc *sch);
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unsigned int flags;
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#define TCQ_F_BUILTIN 1
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#define TCQ_F_INGRESS 2
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#define TCQ_F_CAN_BYPASS 4
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#define TCQ_F_MQROOT 8
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#define TCQ_F_ONETXQUEUE 0x10 /* dequeue_skb() can assume all skbs are for
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* q->dev_queue : It can test
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* netif_xmit_frozen_or_stopped() before
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* dequeueing next packet.
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* Its true for MQ/MQPRIO slaves, or non
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* multiqueue device.
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*/
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#define TCQ_F_WARN_NONWC (1 << 16)
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#define TCQ_F_CPUSTATS 0x20 /* run using percpu statistics */
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#define TCQ_F_NOPARENT 0x40 /* root of its hierarchy :
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* qdisc_tree_decrease_qlen() should stop.
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*/
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#define TCQ_F_INVISIBLE 0x80 /* invisible by default in dump */
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u32 limit;
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const struct Qdisc_ops *ops;
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struct qdisc_size_table __rcu *stab;
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struct hlist_node hash;
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u32 handle;
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u32 parent;
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void *u32_node;
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struct netdev_queue *dev_queue;
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struct net_rate_estimator __rcu *rate_est;
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struct gnet_stats_basic_cpu __percpu *cpu_bstats;
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struct gnet_stats_queue __percpu *cpu_qstats;
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/*
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* For performance sake on SMP, we put highly modified fields at the end
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*/
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struct sk_buff *gso_skb ____cacheline_aligned_in_smp;
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struct qdisc_skb_head q;
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struct gnet_stats_basic_packed bstats;
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seqcount_t running;
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struct gnet_stats_queue qstats;
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unsigned long state;
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struct Qdisc *next_sched;
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struct sk_buff *skb_bad_txq;
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struct rcu_head rcu_head;
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int padded;
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refcount_t refcnt;
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spinlock_t busylock ____cacheline_aligned_in_smp;
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};
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static inline bool qdisc_is_running(const struct Qdisc *qdisc)
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{
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return (raw_read_seqcount(&qdisc->running) & 1) ? true : false;
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}
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static inline bool qdisc_run_begin(struct Qdisc *qdisc)
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{
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if (qdisc_is_running(qdisc))
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return false;
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/* Variant of write_seqcount_begin() telling lockdep a trylock
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* was attempted.
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*/
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raw_write_seqcount_begin(&qdisc->running);
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seqcount_acquire(&qdisc->running.dep_map, 0, 1, _RET_IP_);
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return true;
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}
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static inline void qdisc_run_end(struct Qdisc *qdisc)
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{
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write_seqcount_end(&qdisc->running);
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}
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static inline bool qdisc_may_bulk(const struct Qdisc *qdisc)
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{
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return qdisc->flags & TCQ_F_ONETXQUEUE;
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}
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static inline int qdisc_avail_bulklimit(const struct netdev_queue *txq)
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{
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#ifdef CONFIG_BQL
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/* Non-BQL migrated drivers will return 0, too. */
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return dql_avail(&txq->dql);
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#else
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return 0;
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#endif
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}
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struct Qdisc_class_ops {
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/* Child qdisc manipulation */
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struct netdev_queue * (*select_queue)(struct Qdisc *, struct tcmsg *);
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int (*graft)(struct Qdisc *, unsigned long cl,
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struct Qdisc *, struct Qdisc **);
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struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl);
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void (*qlen_notify)(struct Qdisc *, unsigned long);
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/* Class manipulation routines */
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unsigned long (*get)(struct Qdisc *, u32 classid);
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void (*put)(struct Qdisc *, unsigned long);
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int (*change)(struct Qdisc *, u32, u32,
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struct nlattr **, unsigned long *);
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int (*delete)(struct Qdisc *, unsigned long);
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void (*walk)(struct Qdisc *, struct qdisc_walker * arg);
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/* Filter manipulation */
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struct tcf_block * (*tcf_block)(struct Qdisc *, unsigned long);
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bool (*tcf_cl_offload)(u32 classid);
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unsigned long (*bind_tcf)(struct Qdisc *, unsigned long,
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u32 classid);
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void (*unbind_tcf)(struct Qdisc *, unsigned long);
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/* rtnetlink specific */
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int (*dump)(struct Qdisc *, unsigned long,
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struct sk_buff *skb, struct tcmsg*);
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int (*dump_stats)(struct Qdisc *, unsigned long,
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struct gnet_dump *);
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};
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struct Qdisc_ops {
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struct Qdisc_ops *next;
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const struct Qdisc_class_ops *cl_ops;
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char id[IFNAMSIZ];
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int priv_size;
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int (*enqueue)(struct sk_buff *skb,
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struct Qdisc *sch,
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struct sk_buff **to_free);
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struct sk_buff * (*dequeue)(struct Qdisc *);
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struct sk_buff * (*peek)(struct Qdisc *);
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int (*init)(struct Qdisc *, struct nlattr *arg);
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void (*reset)(struct Qdisc *);
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void (*destroy)(struct Qdisc *);
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int (*change)(struct Qdisc *, struct nlattr *arg);
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void (*attach)(struct Qdisc *);
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int (*dump)(struct Qdisc *, struct sk_buff *);
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int (*dump_stats)(struct Qdisc *, struct gnet_dump *);
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struct module *owner;
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};
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struct tcf_result {
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union {
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struct {
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unsigned long class;
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u32 classid;
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};
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const struct tcf_proto *goto_tp;
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};
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};
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struct tcf_proto_ops {
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struct list_head head;
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char kind[IFNAMSIZ];
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int (*classify)(struct sk_buff *,
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const struct tcf_proto *,
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struct tcf_result *);
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int (*init)(struct tcf_proto*);
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void (*destroy)(struct tcf_proto*);
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unsigned long (*get)(struct tcf_proto*, u32 handle);
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int (*change)(struct net *net, struct sk_buff *,
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struct tcf_proto*, unsigned long,
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u32 handle, struct nlattr **,
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unsigned long *, bool);
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int (*delete)(struct tcf_proto*, unsigned long, bool*);
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void (*walk)(struct tcf_proto*, struct tcf_walker *arg);
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/* rtnetlink specific */
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int (*dump)(struct net*, struct tcf_proto*, unsigned long,
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struct sk_buff *skb, struct tcmsg*);
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struct module *owner;
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};
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struct tcf_proto {
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/* Fast access part */
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struct tcf_proto __rcu *next;
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void __rcu *root;
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int (*classify)(struct sk_buff *,
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const struct tcf_proto *,
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struct tcf_result *);
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__be16 protocol;
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/* All the rest */
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u32 prio;
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u32 classid;
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struct Qdisc *q;
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void *data;
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const struct tcf_proto_ops *ops;
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struct tcf_chain *chain;
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struct rcu_head rcu;
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};
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struct qdisc_skb_cb {
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unsigned int pkt_len;
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u16 slave_dev_queue_mapping;
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u16 tc_classid;
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#define QDISC_CB_PRIV_LEN 20
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unsigned char data[QDISC_CB_PRIV_LEN];
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};
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struct tcf_chain {
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struct tcf_proto __rcu *filter_chain;
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struct tcf_proto __rcu **p_filter_chain;
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struct list_head list;
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struct tcf_block *block;
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u32 index; /* chain index */
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unsigned int refcnt;
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};
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struct tcf_block {
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struct list_head chain_list;
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};
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static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz)
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{
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struct qdisc_skb_cb *qcb;
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BUILD_BUG_ON(sizeof(skb->cb) < offsetof(struct qdisc_skb_cb, data) + sz);
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BUILD_BUG_ON(sizeof(qcb->data) < sz);
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}
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static inline int qdisc_qlen(const struct Qdisc *q)
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{
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return q->q.qlen;
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}
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static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb)
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{
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return (struct qdisc_skb_cb *)skb->cb;
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}
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static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
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{
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return &qdisc->q.lock;
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}
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static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc)
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{
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struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc);
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return q;
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}
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static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc)
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{
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return qdisc->dev_queue->qdisc_sleeping;
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}
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/* The qdisc root lock is a mechanism by which to top level
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* of a qdisc tree can be locked from any qdisc node in the
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* forest. This allows changing the configuration of some
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* aspect of the qdisc tree while blocking out asynchronous
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* qdisc access in the packet processing paths.
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*
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* It is only legal to do this when the root will not change
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* on us. Otherwise we'll potentially lock the wrong qdisc
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* root. This is enforced by holding the RTNL semaphore, which
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* all users of this lock accessor must do.
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*/
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static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc)
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{
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struct Qdisc *root = qdisc_root(qdisc);
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ASSERT_RTNL();
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return qdisc_lock(root);
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}
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static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc)
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{
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struct Qdisc *root = qdisc_root_sleeping(qdisc);
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ASSERT_RTNL();
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return qdisc_lock(root);
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}
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static inline seqcount_t *qdisc_root_sleeping_running(const struct Qdisc *qdisc)
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{
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struct Qdisc *root = qdisc_root_sleeping(qdisc);
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ASSERT_RTNL();
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return &root->running;
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}
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static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc)
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{
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return qdisc->dev_queue->dev;
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}
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static inline void sch_tree_lock(const struct Qdisc *q)
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{
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spin_lock_bh(qdisc_root_sleeping_lock(q));
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}
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static inline void sch_tree_unlock(const struct Qdisc *q)
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{
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spin_unlock_bh(qdisc_root_sleeping_lock(q));
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}
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#define tcf_tree_lock(tp) sch_tree_lock((tp)->q)
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#define tcf_tree_unlock(tp) sch_tree_unlock((tp)->q)
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extern struct Qdisc noop_qdisc;
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extern struct Qdisc_ops noop_qdisc_ops;
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extern struct Qdisc_ops pfifo_fast_ops;
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extern struct Qdisc_ops mq_qdisc_ops;
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extern struct Qdisc_ops noqueue_qdisc_ops;
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extern const struct Qdisc_ops *default_qdisc_ops;
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static inline const struct Qdisc_ops *
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get_default_qdisc_ops(const struct net_device *dev, int ntx)
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{
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return ntx < dev->real_num_tx_queues ?
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default_qdisc_ops : &pfifo_fast_ops;
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}
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struct Qdisc_class_common {
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u32 classid;
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struct hlist_node hnode;
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};
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struct Qdisc_class_hash {
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struct hlist_head *hash;
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unsigned int hashsize;
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unsigned int hashmask;
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unsigned int hashelems;
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};
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static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
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{
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id ^= id >> 8;
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id ^= id >> 4;
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return id & mask;
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}
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static inline struct Qdisc_class_common *
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qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id)
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{
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struct Qdisc_class_common *cl;
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unsigned int h;
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h = qdisc_class_hash(id, hash->hashmask);
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hlist_for_each_entry(cl, &hash->hash[h], hnode) {
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if (cl->classid == id)
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return cl;
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}
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return NULL;
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}
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int qdisc_class_hash_init(struct Qdisc_class_hash *);
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void qdisc_class_hash_insert(struct Qdisc_class_hash *,
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struct Qdisc_class_common *);
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void qdisc_class_hash_remove(struct Qdisc_class_hash *,
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struct Qdisc_class_common *);
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void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
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void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
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void dev_init_scheduler(struct net_device *dev);
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void dev_shutdown(struct net_device *dev);
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void dev_activate(struct net_device *dev);
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void dev_deactivate(struct net_device *dev);
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void dev_deactivate_many(struct list_head *head);
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struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
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struct Qdisc *qdisc);
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void qdisc_reset(struct Qdisc *qdisc);
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void qdisc_destroy(struct Qdisc *qdisc);
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void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, unsigned int n,
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unsigned int len);
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struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
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const struct Qdisc_ops *ops);
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struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
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const struct Qdisc_ops *ops, u32 parentid);
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void __qdisc_calculate_pkt_len(struct sk_buff *skb,
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const struct qdisc_size_table *stab);
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int skb_do_redirect(struct sk_buff *);
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static inline void skb_reset_tc(struct sk_buff *skb)
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{
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#ifdef CONFIG_NET_CLS_ACT
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skb->tc_redirected = 0;
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#endif
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}
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static inline bool skb_at_tc_ingress(const struct sk_buff *skb)
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{
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#ifdef CONFIG_NET_CLS_ACT
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return skb->tc_at_ingress;
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#else
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return false;
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#endif
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}
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static inline bool skb_skip_tc_classify(struct sk_buff *skb)
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{
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#ifdef CONFIG_NET_CLS_ACT
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if (skb->tc_skip_classify) {
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skb->tc_skip_classify = 0;
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return true;
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}
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#endif
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return false;
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}
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/* Reset all TX qdiscs greater then index of a device. */
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static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
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{
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struct Qdisc *qdisc;
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for (; i < dev->num_tx_queues; i++) {
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qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc);
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if (qdisc) {
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spin_lock_bh(qdisc_lock(qdisc));
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qdisc_reset(qdisc);
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spin_unlock_bh(qdisc_lock(qdisc));
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}
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}
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}
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static inline void qdisc_reset_all_tx(struct net_device *dev)
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{
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qdisc_reset_all_tx_gt(dev, 0);
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}
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/* Are all TX queues of the device empty? */
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static inline bool qdisc_all_tx_empty(const struct net_device *dev)
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{
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unsigned int i;
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rcu_read_lock();
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for (i = 0; i < dev->num_tx_queues; i++) {
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struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
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const struct Qdisc *q = rcu_dereference(txq->qdisc);
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if (q->q.qlen) {
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rcu_read_unlock();
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return false;
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}
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}
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rcu_read_unlock();
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return true;
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}
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/* Are any of the TX qdiscs changing? */
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static inline bool qdisc_tx_changing(const struct net_device *dev)
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{
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unsigned int i;
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for (i = 0; i < dev->num_tx_queues; i++) {
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struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
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if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping)
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return true;
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}
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return false;
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}
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/* Is the device using the noop qdisc on all queues? */
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static inline bool qdisc_tx_is_noop(const struct net_device *dev)
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{
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unsigned int i;
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for (i = 0; i < dev->num_tx_queues; i++) {
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struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
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if (rcu_access_pointer(txq->qdisc) != &noop_qdisc)
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return false;
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}
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return true;
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|
}
|
|
|
|
static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
|
|
{
|
|
return qdisc_skb_cb(skb)->pkt_len;
|
|
}
|
|
|
|
/* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
|
|
enum net_xmit_qdisc_t {
|
|
__NET_XMIT_STOLEN = 0x00010000,
|
|
__NET_XMIT_BYPASS = 0x00020000,
|
|
};
|
|
|
|
#ifdef CONFIG_NET_CLS_ACT
|
|
#define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
|
|
#else
|
|
#define net_xmit_drop_count(e) (1)
|
|
#endif
|
|
|
|
static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
|
|
const struct Qdisc *sch)
|
|
{
|
|
#ifdef CONFIG_NET_SCHED
|
|
struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);
|
|
|
|
if (stab)
|
|
__qdisc_calculate_pkt_len(skb, stab);
|
|
#endif
|
|
}
|
|
|
|
static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch,
|
|
struct sk_buff **to_free)
|
|
{
|
|
qdisc_calculate_pkt_len(skb, sch);
|
|
return sch->enqueue(skb, sch, to_free);
|
|
}
|
|
|
|
static inline bool qdisc_is_percpu_stats(const struct Qdisc *q)
|
|
{
|
|
return q->flags & TCQ_F_CPUSTATS;
|
|
}
|
|
|
|
static inline void _bstats_update(struct gnet_stats_basic_packed *bstats,
|
|
__u64 bytes, __u32 packets)
|
|
{
|
|
bstats->bytes += bytes;
|
|
bstats->packets += packets;
|
|
}
|
|
|
|
static inline void bstats_update(struct gnet_stats_basic_packed *bstats,
|
|
const struct sk_buff *skb)
|
|
{
|
|
_bstats_update(bstats,
|
|
qdisc_pkt_len(skb),
|
|
skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1);
|
|
}
|
|
|
|
static inline void _bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
|
|
__u64 bytes, __u32 packets)
|
|
{
|
|
u64_stats_update_begin(&bstats->syncp);
|
|
_bstats_update(&bstats->bstats, bytes, packets);
|
|
u64_stats_update_end(&bstats->syncp);
|
|
}
|
|
|
|
static inline void bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
|
|
const struct sk_buff *skb)
|
|
{
|
|
u64_stats_update_begin(&bstats->syncp);
|
|
bstats_update(&bstats->bstats, skb);
|
|
u64_stats_update_end(&bstats->syncp);
|
|
}
|
|
|
|
static inline void qdisc_bstats_cpu_update(struct Qdisc *sch,
|
|
const struct sk_buff *skb)
|
|
{
|
|
bstats_cpu_update(this_cpu_ptr(sch->cpu_bstats), skb);
|
|
}
|
|
|
|
static inline void qdisc_bstats_update(struct Qdisc *sch,
|
|
const struct sk_buff *skb)
|
|
{
|
|
bstats_update(&sch->bstats, skb);
|
|
}
|
|
|
|
static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch,
|
|
const struct sk_buff *skb)
|
|
{
|
|
sch->qstats.backlog -= qdisc_pkt_len(skb);
|
|
}
|
|
|
|
static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch,
|
|
const struct sk_buff *skb)
|
|
{
|
|
sch->qstats.backlog += qdisc_pkt_len(skb);
|
|
}
|
|
|
|
static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count)
|
|
{
|
|
sch->qstats.drops += count;
|
|
}
|
|
|
|
static inline void qstats_drop_inc(struct gnet_stats_queue *qstats)
|
|
{
|
|
qstats->drops++;
|
|
}
|
|
|
|
static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats)
|
|
{
|
|
qstats->overlimits++;
|
|
}
|
|
|
|
static inline void qdisc_qstats_drop(struct Qdisc *sch)
|
|
{
|
|
qstats_drop_inc(&sch->qstats);
|
|
}
|
|
|
|
static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch)
|
|
{
|
|
this_cpu_inc(sch->cpu_qstats->drops);
|
|
}
|
|
|
|
static inline void qdisc_qstats_overlimit(struct Qdisc *sch)
|
|
{
|
|
sch->qstats.overlimits++;
|
|
}
|
|
|
|
static inline void qdisc_skb_head_init(struct qdisc_skb_head *qh)
|
|
{
|
|
qh->head = NULL;
|
|
qh->tail = NULL;
|
|
qh->qlen = 0;
|
|
}
|
|
|
|
static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,
|
|
struct qdisc_skb_head *qh)
|
|
{
|
|
struct sk_buff *last = qh->tail;
|
|
|
|
if (last) {
|
|
skb->next = NULL;
|
|
last->next = skb;
|
|
qh->tail = skb;
|
|
} else {
|
|
qh->tail = skb;
|
|
qh->head = skb;
|
|
}
|
|
qh->qlen++;
|
|
qdisc_qstats_backlog_inc(sch, skb);
|
|
|
|
return NET_XMIT_SUCCESS;
|
|
}
|
|
|
|
static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
|
|
{
|
|
return __qdisc_enqueue_tail(skb, sch, &sch->q);
|
|
}
|
|
|
|
static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh)
|
|
{
|
|
struct sk_buff *skb = qh->head;
|
|
|
|
if (likely(skb != NULL)) {
|
|
qh->head = skb->next;
|
|
qh->qlen--;
|
|
if (qh->head == NULL)
|
|
qh->tail = NULL;
|
|
skb->next = NULL;
|
|
}
|
|
|
|
return skb;
|
|
}
|
|
|
|
static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
|
|
{
|
|
struct sk_buff *skb = __qdisc_dequeue_head(&sch->q);
|
|
|
|
if (likely(skb != NULL)) {
|
|
qdisc_qstats_backlog_dec(sch, skb);
|
|
qdisc_bstats_update(sch, skb);
|
|
}
|
|
|
|
return skb;
|
|
}
|
|
|
|
/* Instead of calling kfree_skb() while root qdisc lock is held,
|
|
* queue the skb for future freeing at end of __dev_xmit_skb()
|
|
*/
|
|
static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free)
|
|
{
|
|
skb->next = *to_free;
|
|
*to_free = skb;
|
|
}
|
|
|
|
static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
|
|
struct qdisc_skb_head *qh,
|
|
struct sk_buff **to_free)
|
|
{
|
|
struct sk_buff *skb = __qdisc_dequeue_head(qh);
|
|
|
|
if (likely(skb != NULL)) {
|
|
unsigned int len = qdisc_pkt_len(skb);
|
|
|
|
qdisc_qstats_backlog_dec(sch, skb);
|
|
__qdisc_drop(skb, to_free);
|
|
return len;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch,
|
|
struct sk_buff **to_free)
|
|
{
|
|
return __qdisc_queue_drop_head(sch, &sch->q, to_free);
|
|
}
|
|
|
|
static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
|
|
{
|
|
const struct qdisc_skb_head *qh = &sch->q;
|
|
|
|
return qh->head;
|
|
}
|
|
|
|
/* generic pseudo peek method for non-work-conserving qdisc */
|
|
static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
|
|
{
|
|
/* we can reuse ->gso_skb because peek isn't called for root qdiscs */
|
|
if (!sch->gso_skb) {
|
|
sch->gso_skb = sch->dequeue(sch);
|
|
if (sch->gso_skb) {
|
|
/* it's still part of the queue */
|
|
qdisc_qstats_backlog_inc(sch, sch->gso_skb);
|
|
sch->q.qlen++;
|
|
}
|
|
}
|
|
|
|
return sch->gso_skb;
|
|
}
|
|
|
|
/* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
|
|
static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
|
|
{
|
|
struct sk_buff *skb = sch->gso_skb;
|
|
|
|
if (skb) {
|
|
sch->gso_skb = NULL;
|
|
qdisc_qstats_backlog_dec(sch, skb);
|
|
sch->q.qlen--;
|
|
} else {
|
|
skb = sch->dequeue(sch);
|
|
}
|
|
|
|
return skb;
|
|
}
|
|
|
|
static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh)
|
|
{
|
|
/*
|
|
* We do not know the backlog in bytes of this list, it
|
|
* is up to the caller to correct it
|
|
*/
|
|
ASSERT_RTNL();
|
|
if (qh->qlen) {
|
|
rtnl_kfree_skbs(qh->head, qh->tail);
|
|
|
|
qh->head = NULL;
|
|
qh->tail = NULL;
|
|
qh->qlen = 0;
|
|
}
|
|
}
|
|
|
|
static inline void qdisc_reset_queue(struct Qdisc *sch)
|
|
{
|
|
__qdisc_reset_queue(&sch->q);
|
|
sch->qstats.backlog = 0;
|
|
}
|
|
|
|
static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new,
|
|
struct Qdisc **pold)
|
|
{
|
|
struct Qdisc *old;
|
|
|
|
sch_tree_lock(sch);
|
|
old = *pold;
|
|
*pold = new;
|
|
if (old != NULL) {
|
|
unsigned int qlen = old->q.qlen;
|
|
unsigned int backlog = old->qstats.backlog;
|
|
|
|
qdisc_reset(old);
|
|
qdisc_tree_reduce_backlog(old, qlen, backlog);
|
|
}
|
|
sch_tree_unlock(sch);
|
|
|
|
return old;
|
|
}
|
|
|
|
static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
|
|
{
|
|
rtnl_kfree_skbs(skb, skb);
|
|
qdisc_qstats_drop(sch);
|
|
}
|
|
|
|
|
|
static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch,
|
|
struct sk_buff **to_free)
|
|
{
|
|
__qdisc_drop(skb, to_free);
|
|
qdisc_qstats_drop(sch);
|
|
|
|
return NET_XMIT_DROP;
|
|
}
|
|
|
|
/* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
|
|
long it will take to send a packet given its size.
|
|
*/
|
|
static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
|
|
{
|
|
int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
|
|
if (slot < 0)
|
|
slot = 0;
|
|
slot >>= rtab->rate.cell_log;
|
|
if (slot > 255)
|
|
return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF];
|
|
return rtab->data[slot];
|
|
}
|
|
|
|
struct psched_ratecfg {
|
|
u64 rate_bytes_ps; /* bytes per second */
|
|
u32 mult;
|
|
u16 overhead;
|
|
u8 linklayer;
|
|
u8 shift;
|
|
};
|
|
|
|
static inline u64 psched_l2t_ns(const struct psched_ratecfg *r,
|
|
unsigned int len)
|
|
{
|
|
len += r->overhead;
|
|
|
|
if (unlikely(r->linklayer == TC_LINKLAYER_ATM))
|
|
return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift;
|
|
|
|
return ((u64)len * r->mult) >> r->shift;
|
|
}
|
|
|
|
void psched_ratecfg_precompute(struct psched_ratecfg *r,
|
|
const struct tc_ratespec *conf,
|
|
u64 rate64);
|
|
|
|
static inline void psched_ratecfg_getrate(struct tc_ratespec *res,
|
|
const struct psched_ratecfg *r)
|
|
{
|
|
memset(res, 0, sizeof(*res));
|
|
|
|
/* legacy struct tc_ratespec has a 32bit @rate field
|
|
* Qdisc using 64bit rate should add new attributes
|
|
* in order to maintain compatibility.
|
|
*/
|
|
res->rate = min_t(u64, r->rate_bytes_ps, ~0U);
|
|
|
|
res->overhead = r->overhead;
|
|
res->linklayer = (r->linklayer & TC_LINKLAYER_MASK);
|
|
}
|
|
|
|
#endif
|