2005-08-12 19:19:38 +07:00
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/*
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* INET An implementation of the TCP/IP protocol suite for the LINUX
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* operating system. INET is implemented using the BSD Socket
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* interface as the means of communication with the user level.
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*
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* Authors: Lotsa people, from code originally in tcp
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifndef _INET6_HASHTABLES_H
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#define _INET6_HASHTABLES_H
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2005-08-12 19:26:18 +07:00
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2011-12-10 16:48:31 +07:00
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#if IS_ENABLED(CONFIG_IPV6)
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2005-08-12 19:26:18 +07:00
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#include <linux/in6.h>
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#include <linux/ipv6.h>
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2005-08-12 19:19:38 +07:00
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#include <linux/types.h>
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2007-03-24 01:40:27 +07:00
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#include <linux/jhash.h>
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#include <net/inet_sock.h>
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2005-08-12 19:19:38 +07:00
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2005-08-12 19:26:18 +07:00
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#include <net/ipv6.h>
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2008-06-17 07:14:11 +07:00
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#include <net/netns/hash.h>
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2005-08-12 19:26:18 +07:00
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2005-08-12 19:19:38 +07:00
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struct inet_hashinfo;
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2008-06-17 07:13:48 +07:00
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static inline unsigned int inet6_ehashfn(struct net *net,
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const struct in6_addr *laddr, const u16 lport,
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2006-11-08 15:20:00 +07:00
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const struct in6_addr *faddr, const __be16 fport)
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2005-08-12 19:26:18 +07:00
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{
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2013-02-21 19:18:52 +07:00
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u32 ports = (((u32)lport) << 16) | (__force u32)fport;
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2005-08-12 19:26:18 +07:00
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2007-03-24 01:40:27 +07:00
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return jhash_3words((__force u32)laddr->s6_addr32[3],
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2013-02-21 19:18:52 +07:00
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ipv6_addr_jhash(faddr),
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ports,
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inet_ehash_secret + net_hash_mix(net));
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2005-08-12 19:26:18 +07:00
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}
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[INET]: speedup inet (tcp/dccp) lookups
Arnaldo and I agreed it could be applied now, because I have other
pending patches depending on this one (Thank you Arnaldo)
(The other important patch moves skc_refcnt in a separate cache line,
so that the SMP/NUMA performance doesnt suffer from cache line ping pongs)
1) First some performance data :
--------------------------------
tcp_v4_rcv() wastes a *lot* of time in __inet_lookup_established()
The most time critical code is :
sk_for_each(sk, node, &head->chain) {
if (INET_MATCH(sk, acookie, saddr, daddr, ports, dif))
goto hit; /* You sunk my battleship! */
}
The sk_for_each() does use prefetch() hints but only the begining of
"struct sock" is prefetched.
As INET_MATCH first comparison uses inet_sk(__sk)->daddr, wich is far
away from the begining of "struct sock", it has to bring into CPU
cache cold cache line. Each iteration has to use at least 2 cache
lines.
This can be problematic if some chains are very long.
2) The goal
-----------
The idea I had is to change things so that INET_MATCH() may return
FALSE in 99% of cases only using the data already in the CPU cache,
using one cache line per iteration.
3) Description of the patch
---------------------------
Adds a new 'unsigned int skc_hash' field in 'struct sock_common',
filling a 32 bits hole on 64 bits platform.
struct sock_common {
unsigned short skc_family;
volatile unsigned char skc_state;
unsigned char skc_reuse;
int skc_bound_dev_if;
struct hlist_node skc_node;
struct hlist_node skc_bind_node;
atomic_t skc_refcnt;
+ unsigned int skc_hash;
struct proto *skc_prot;
};
Store in this 32 bits field the full hash, not masked by (ehash_size -
1) Using this full hash as the first comparison done in INET_MATCH
permits us immediatly skip the element without touching a second cache
line in case of a miss.
Suppress the sk_hashent/tw_hashent fields since skc_hash (aliased to
sk_hash and tw_hash) already contains the slot number if we mask with
(ehash_size - 1)
File include/net/inet_hashtables.h
64 bits platforms :
#define INET_MATCH(__sk, __hash, __cookie, __saddr, __daddr, __ports, __dif)\
(((__sk)->sk_hash == (__hash))
((*((__u64 *)&(inet_sk(__sk)->daddr)))== (__cookie)) && \
((*((__u32 *)&(inet_sk(__sk)->dport))) == (__ports)) && \
(!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
32bits platforms:
#define TCP_IPV4_MATCH(__sk, __hash, __cookie, __saddr, __daddr, __ports, __dif)\
(((__sk)->sk_hash == (__hash)) && \
(inet_sk(__sk)->daddr == (__saddr)) && \
(inet_sk(__sk)->rcv_saddr == (__daddr)) && \
(!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
- Adds a prefetch(head->chain.first) in
__inet_lookup_established()/__tcp_v4_check_established() and
__inet6_lookup_established()/__tcp_v6_check_established() and
__dccp_v4_check_established() to bring into cache the first element of the
list, before the {read|write}_lock(&head->lock);
Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Acked-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-10-04 04:13:38 +07:00
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static inline int inet6_sk_ehashfn(const struct sock *sk)
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2005-08-12 19:26:18 +07:00
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{
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const struct inet_sock *inet = inet_sk(sk);
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const struct ipv6_pinfo *np = inet6_sk(sk);
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const struct in6_addr *laddr = &np->rcv_saddr;
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const struct in6_addr *faddr = &np->daddr;
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2009-10-15 13:30:45 +07:00
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const __u16 lport = inet->inet_num;
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const __be16 fport = inet->inet_dport;
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2008-06-17 07:13:48 +07:00
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struct net *net = sock_net(sk);
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return inet6_ehashfn(net, laddr, lport, faddr, fport);
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2005-08-12 19:26:18 +07:00
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}
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2009-12-04 10:46:54 +07:00
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extern int __inet6_hash(struct sock *sk, struct inet_timewait_sock *twp);
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2005-12-14 14:15:01 +07:00
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2005-08-12 19:26:18 +07:00
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/*
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* Sockets in TCP_CLOSE state are _always_ taken out of the hash, so
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* we need not check it for TCP lookups anymore, thanks Alexey. -DaveM
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*
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* The sockhash lock must be held as a reader here.
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*/
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2008-01-31 20:07:21 +07:00
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extern struct sock *__inet6_lookup_established(struct net *net,
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struct inet_hashinfo *hashinfo,
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2005-08-12 19:26:18 +07:00
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const struct in6_addr *saddr,
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2006-11-08 15:20:00 +07:00
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const __be16 sport,
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2005-08-12 19:26:18 +07:00
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const struct in6_addr *daddr,
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const u16 hnum,
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2006-04-10 12:48:59 +07:00
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const int dif);
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2005-08-12 19:26:18 +07:00
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2008-01-31 20:07:21 +07:00
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extern struct sock *inet6_lookup_listener(struct net *net,
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struct inet_hashinfo *hashinfo,
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2013-01-22 16:50:39 +07:00
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const struct in6_addr *saddr,
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const __be16 sport,
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2005-08-12 19:26:18 +07:00
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const struct in6_addr *daddr,
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const unsigned short hnum,
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const int dif);
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2008-01-31 20:07:21 +07:00
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static inline struct sock *__inet6_lookup(struct net *net,
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struct inet_hashinfo *hashinfo,
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2005-08-12 19:26:18 +07:00
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const struct in6_addr *saddr,
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2006-11-08 15:20:00 +07:00
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const __be16 sport,
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2005-08-12 19:26:18 +07:00
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const struct in6_addr *daddr,
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const u16 hnum,
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const int dif)
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{
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2008-01-31 20:07:21 +07:00
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struct sock *sk = __inet6_lookup_established(net, hashinfo, saddr,
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sport, daddr, hnum, dif);
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2005-08-12 19:26:18 +07:00
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if (sk)
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return sk;
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2013-01-22 16:50:39 +07:00
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return inet6_lookup_listener(net, hashinfo, saddr, sport,
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daddr, hnum, dif);
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2005-08-12 19:26:18 +07:00
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}
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2008-10-08 01:41:57 +07:00
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static inline struct sock *__inet6_lookup_skb(struct inet_hashinfo *hashinfo,
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struct sk_buff *skb,
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const __be16 sport,
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const __be16 dport)
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{
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2012-07-26 19:18:11 +07:00
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struct sock *sk = skb_steal_sock(skb);
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2008-10-08 02:41:01 +07:00
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2012-07-26 19:18:11 +07:00
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if (sk)
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2008-10-08 02:41:01 +07:00
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return sk;
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2012-07-26 19:18:11 +07:00
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return __inet6_lookup(dev_net(skb_dst(skb)->dev), hashinfo,
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&ipv6_hdr(skb)->saddr, sport,
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&ipv6_hdr(skb)->daddr, ntohs(dport),
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inet6_iif(skb));
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2008-10-08 01:41:57 +07:00
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}
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2008-01-31 20:07:21 +07:00
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extern struct sock *inet6_lookup(struct net *net, struct inet_hashinfo *hashinfo,
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2006-11-08 15:20:00 +07:00
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const struct in6_addr *saddr, const __be16 sport,
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const struct in6_addr *daddr, const __be16 dport,
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2005-08-12 19:19:38 +07:00
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const int dif);
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2011-12-10 16:48:31 +07:00
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#endif /* IS_ENABLED(CONFIG_IPV6) */
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2005-08-12 19:19:38 +07:00
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#endif /* _INET6_HASHTABLES_H */
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