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authorArnaldo Carvalho de Melo <acme@ghostprotocols.net>2005-08-09 19:59:20 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2005-08-29 15:38:22 -0700
commit304a16180fb6d2b153b45f6fbbcec1fa814496e5 (patch)
tree3cf82b06fcf12480a49d89ead016cb60e50c36b3 /include/net/inet_hashtables.h
parent0597f2680d666a3bcf101ac0c771ba7e50016bbd (diff)
[INET]: Move the TCP ehash functions to include/net/inet_hashtables.h
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>
Diffstat (limited to 'include/net/inet_hashtables.h')
-rw-r--r--include/net/inet_hashtables.h40
1 files changed, 40 insertions, 0 deletions
diff --git a/include/net/inet_hashtables.h b/include/net/inet_hashtables.h
new file mode 100644
index 000000000000..c4c9e39f4505
--- /dev/null
+++ b/include/net/inet_hashtables.h
@@ -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 */