forked from luck/tmp_suning_uos_patched
1c0d32fde5
1) Old code was hard to maintain, due to complex lock chains. (We probably will be able to remove some kfree_rcu() in callers) 2) Using a single timer to update all estimators does not scale. 3) Code was buggy on 32bit kernel (WRITE_ONCE() on 64bit quantity is not supposed to work well) In this rewrite : - I removed the RB tree that had to be scanned in gen_estimator_active(). qdisc dumps should be much faster. - Each estimator has its own timer. - Estimations are maintained in net_rate_estimator structure, instead of dirtying the qdisc. Minor, but part of the simplification. - Reading the estimator uses RCU and a seqcount to provide proper support for 32bit kernels. - We reduce memory need when estimators are not used, since we store a pointer, instead of the bytes/packets counters. - xt_rateest_mt() no longer has to grab a spinlock. (In the future, xt_rateest_tg() could be switched to per cpu counters) Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
70 lines
2.3 KiB
C
70 lines
2.3 KiB
C
#ifndef __NET_GEN_STATS_H
|
|
#define __NET_GEN_STATS_H
|
|
|
|
#include <linux/gen_stats.h>
|
|
#include <linux/socket.h>
|
|
#include <linux/rtnetlink.h>
|
|
#include <linux/pkt_sched.h>
|
|
|
|
struct gnet_stats_basic_cpu {
|
|
struct gnet_stats_basic_packed bstats;
|
|
struct u64_stats_sync syncp;
|
|
};
|
|
|
|
struct net_rate_estimator;
|
|
|
|
struct gnet_dump {
|
|
spinlock_t * lock;
|
|
struct sk_buff * skb;
|
|
struct nlattr * tail;
|
|
|
|
/* Backward compatibility */
|
|
int compat_tc_stats;
|
|
int compat_xstats;
|
|
int padattr;
|
|
void * xstats;
|
|
int xstats_len;
|
|
struct tc_stats tc_stats;
|
|
};
|
|
|
|
int gnet_stats_start_copy(struct sk_buff *skb, int type, spinlock_t *lock,
|
|
struct gnet_dump *d, int padattr);
|
|
|
|
int gnet_stats_start_copy_compat(struct sk_buff *skb, int type,
|
|
int tc_stats_type, int xstats_type,
|
|
spinlock_t *lock, struct gnet_dump *d,
|
|
int padattr);
|
|
|
|
int gnet_stats_copy_basic(const seqcount_t *running,
|
|
struct gnet_dump *d,
|
|
struct gnet_stats_basic_cpu __percpu *cpu,
|
|
struct gnet_stats_basic_packed *b);
|
|
void __gnet_stats_copy_basic(const seqcount_t *running,
|
|
struct gnet_stats_basic_packed *bstats,
|
|
struct gnet_stats_basic_cpu __percpu *cpu,
|
|
struct gnet_stats_basic_packed *b);
|
|
int gnet_stats_copy_rate_est(struct gnet_dump *d,
|
|
struct net_rate_estimator __rcu **ptr);
|
|
int gnet_stats_copy_queue(struct gnet_dump *d,
|
|
struct gnet_stats_queue __percpu *cpu_q,
|
|
struct gnet_stats_queue *q, __u32 qlen);
|
|
int gnet_stats_copy_app(struct gnet_dump *d, void *st, int len);
|
|
|
|
int gnet_stats_finish_copy(struct gnet_dump *d);
|
|
|
|
int gen_new_estimator(struct gnet_stats_basic_packed *bstats,
|
|
struct gnet_stats_basic_cpu __percpu *cpu_bstats,
|
|
struct net_rate_estimator __rcu **rate_est,
|
|
spinlock_t *stats_lock,
|
|
seqcount_t *running, struct nlattr *opt);
|
|
void gen_kill_estimator(struct net_rate_estimator __rcu **ptr);
|
|
int gen_replace_estimator(struct gnet_stats_basic_packed *bstats,
|
|
struct gnet_stats_basic_cpu __percpu *cpu_bstats,
|
|
struct net_rate_estimator __rcu **ptr,
|
|
spinlock_t *stats_lock,
|
|
seqcount_t *running, struct nlattr *opt);
|
|
bool gen_estimator_active(struct net_rate_estimator __rcu **ptr);
|
|
bool gen_estimator_read(struct net_rate_estimator __rcu **ptr,
|
|
struct gnet_stats_rate_est64 *sample);
|
|
#endif
|