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https://github.com/edk2-porting/linux-next.git
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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
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#define __NET_GEN_STATS_H
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#include <linux/gen_stats.h>
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#include <linux/socket.h>
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#include <linux/rtnetlink.h>
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#include <linux/pkt_sched.h>
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struct gnet_stats_basic_cpu {
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struct gnet_stats_basic_packed bstats;
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struct u64_stats_sync syncp;
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};
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struct net_rate_estimator;
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struct gnet_dump {
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spinlock_t * lock;
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struct sk_buff * skb;
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struct nlattr * tail;
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/* Backward compatibility */
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int compat_tc_stats;
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int compat_xstats;
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int padattr;
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void * xstats;
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int xstats_len;
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struct tc_stats tc_stats;
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};
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int gnet_stats_start_copy(struct sk_buff *skb, int type, spinlock_t *lock,
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struct gnet_dump *d, int padattr);
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int gnet_stats_start_copy_compat(struct sk_buff *skb, int type,
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int tc_stats_type, int xstats_type,
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spinlock_t *lock, struct gnet_dump *d,
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int padattr);
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int gnet_stats_copy_basic(const seqcount_t *running,
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struct gnet_dump *d,
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struct gnet_stats_basic_cpu __percpu *cpu,
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struct gnet_stats_basic_packed *b);
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void __gnet_stats_copy_basic(const seqcount_t *running,
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struct gnet_stats_basic_packed *bstats,
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struct gnet_stats_basic_cpu __percpu *cpu,
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struct gnet_stats_basic_packed *b);
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int gnet_stats_copy_rate_est(struct gnet_dump *d,
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struct net_rate_estimator __rcu **ptr);
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int gnet_stats_copy_queue(struct gnet_dump *d,
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struct gnet_stats_queue __percpu *cpu_q,
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struct gnet_stats_queue *q, __u32 qlen);
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int gnet_stats_copy_app(struct gnet_dump *d, void *st, int len);
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int gnet_stats_finish_copy(struct gnet_dump *d);
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int gen_new_estimator(struct gnet_stats_basic_packed *bstats,
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struct gnet_stats_basic_cpu __percpu *cpu_bstats,
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struct net_rate_estimator __rcu **rate_est,
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spinlock_t *stats_lock,
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seqcount_t *running, struct nlattr *opt);
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void gen_kill_estimator(struct net_rate_estimator __rcu **ptr);
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int gen_replace_estimator(struct gnet_stats_basic_packed *bstats,
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struct gnet_stats_basic_cpu __percpu *cpu_bstats,
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struct net_rate_estimator __rcu **ptr,
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spinlock_t *stats_lock,
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seqcount_t *running, struct nlattr *opt);
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bool gen_estimator_active(struct net_rate_estimator __rcu **ptr);
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bool gen_estimator_read(struct net_rate_estimator __rcu **ptr,
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struct gnet_stats_rate_est64 *sample);
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#endif
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