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[INET]: Move the TCP ehash functions to include/net/inet_hashtables.h

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To be shared with DCCP (and others), this is the start of a series of patches
that will expose the already generic TCP hash table routines.

The few changes noticed when calling gcc -S before/after on a pentium4 were of
this type:

        movl    40(%esp), %edx
        cmpl    %esi, 472(%edx)
        je      .L168
-       pushl   $291
+       pushl   $272
        pushl   $.LC0
        pushl   $.LC1
        pushl   $.LC2

[acme@toy net-2.6.14]$ size net/ipv4/tcp_ipv4.before.o net/ipv4/tcp_ipv4.after.o
   text    data     bss     dec     hex filename
  17804     516     140   18460    481c net/ipv4/tcp_ipv4.before.o
  17804     516     140   18460    481c net/ipv4/tcp_ipv4.after.o

Holler if some weird architecture has issues with things like this 8)

Signed-off-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Arnaldo Carvalho de Melo
2005-08-09 19:59:20 -07:00
committed by David S. Miller
parent 0597f2680d
commit 304a16180f
2 changed files with 45 additions and 23 deletions
Download Patch File Download Diff File Expand all files Collapse all files

40
include/net/inet_hashtables.h Normal file
View File

@@ -0,0 +1,40 @@
/*
* INET An implementation of the TCP/IP protocol suite for the LINUX
* operating system. INET is implemented using the BSD Socket
* interface as the means of communication with the user level.
*
* Authors: Lotsa people, from code originally in tcp
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#ifndef _INET_HASHTABLES_H
#define _INET_HASHTABLES_H
#include <linux/types.h>
static inline int inet_ehashfn(const __u32 laddr, const __u16 lport,
const __u32 faddr, const __u16 fport,
const int ehash_size)
{
int h = (laddr ^ lport) ^ (faddr ^ fport);
h ^= h >> 16;
h ^= h >> 8;
return h & (ehash_size - 1);
}
static inline int inet_sk_ehashfn(const struct sock *sk, const int ehash_size)
{
const struct inet_sock *inet = inet_sk(sk);
const __u32 laddr = inet->rcv_saddr;
const __u16 lport = inet->num;
const __u32 faddr = inet->daddr;
const __u16 fport = inet->dport;
return inet_ehashfn(laddr, lport, faddr, fport, ehash_size);
}
#endif /* _INET_HASHTABLES_H */