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[INET]: Generalise tcp_v4_hash & tcp_unhash

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It really just makes the existing code be a helper function that
tcp_v4_hash and tcp_unhash uses, specifying the right inet_hashinfo,
tcp_hashinfo.

One thing I'll investigate at some point is to have the inet_hashinfo
pointer in sk_prot, so that we get all the hashtable information from
the sk pointer, this can lead to some extra indirections that may well
hurt performance/code size, we'll see. Ultimate idea would be that
sk_prot would provide _all_ the information about a protocol
implementation.

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 20:08:50 -07:00 committed by David S. Miller
parent c752f0739f
commit 81849d106b
2 changed files with 36 additions and 27 deletions
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34
include/net/inet_hashtables.h
View file

@ -240,4 +240,38 @@ static inline void __inet_hash(struct inet_hashinfo *hashinfo,
if (listen_possible && sk->sk_state == TCP_LISTEN)
wake_up(&hashinfo->lhash_wait);
}
static inline void inet_hash(struct inet_hashinfo *hashinfo, struct sock *sk)
{
if (sk->sk_state != TCP_CLOSE) {
local_bh_disable();
__inet_hash(hashinfo, sk, 1);
local_bh_enable();
}
}
static inline void inet_unhash(struct inet_hashinfo *hashinfo, struct sock *sk)
{
rwlock_t *lock;
if (sk_unhashed(sk))
goto out;
if (sk->sk_state == TCP_LISTEN) {
local_bh_disable();
inet_listen_wlock(hashinfo);
lock = &hashinfo->lhash_lock;
} else {
struct inet_ehash_bucket *head = &hashinfo->ehash[sk->sk_hashent];
lock = &head->lock;
write_lock_bh(&head->lock);
}
if (__sk_del_node_init(sk))
sock_prot_dec_use(sk->sk_prot);
write_unlock_bh(lock);
out:
if (sk->sk_state == TCP_LISTEN)
wake_up(&hashinfo->lhash_wait);
}
#endif /* _INET_HASHTABLES_H */

29
net/ipv4/tcp_ipv4.c
View file

@ -230,37 +230,12 @@ fail:
static void tcp_v4_hash(struct sock *sk)
{
if (sk->sk_state != TCP_CLOSE) {
local_bh_disable();
__inet_hash(&tcp_hashinfo, sk, 1);
local_bh_enable();
}
inet_hash(&tcp_hashinfo, sk);
}
void tcp_unhash(struct sock *sk)
{
rwlock_t *lock;
if (sk_unhashed(sk))
goto ende;
if (sk->sk_state == TCP_LISTEN) {
local_bh_disable();
inet_listen_wlock(&tcp_hashinfo);
lock = &tcp_hashinfo.lhash_lock;
} else {
struct inet_ehash_bucket *head = &tcp_hashinfo.ehash[sk->sk_hashent];
lock = &head->lock;
write_lock_bh(&head->lock);
}
if (__sk_del_node_init(sk))
sock_prot_dec_use(sk->sk_prot);
write_unlock_bh(lock);
ende:
if (sk->sk_state == TCP_LISTEN)
wake_up(&tcp_hashinfo.lhash_wait);
inet_unhash(&tcp_hashinfo, sk);
}
/* Don't inline this cruft. Here are some nice properties to