On Sat, 31 Jan 2009 00:50:08 +0300
Evgeniy Polyakov <zbr@xxxxxxxxxxx> wrote:
> On Fri, Jan 30, 2009 at 07:41:59PM +0100, Eric Dumazet (dada1@xxxxxxxxxxxxx) wrote:
> > Reviewing commit a9d8f9110d7e953c2f2b521087a4179677843c2a
> >
> > I see use of a hashinfo->bsockets field that :
> >
> > - lacks proper lock/synchronization
>
> It should contain rough number of sockets, there is no need to be very
> precise because of this hueristic.
>
> > - suffers from cache line ping pongs on SMP
>
> I used free alignment slot so that socket structure would not be
> icreased.
>
> > Also there might be a problem at line 175
> >
> > if (sk->sk_reuse && sk->sk_state != TCP_LISTEN && --attempts >= 0) {
> > spin_unlock(&head->lock);
> > goto again;
> >
> > If we entered inet_csk_get_port() with a non null snum, we can "goto again"
> > while it was not expected.
> >
> > diff --git a/net/ipv4/inet_connection_sock.c b/net/ipv4/inet_connection_sock.c
> > index df8e72f..752c6b2 100644
> > --- a/net/ipv4/inet_connection_sock.c
> > +++ b/net/ipv4/inet_connection_sock.c
> > @@ -172,7 +172,8 @@ tb_found:
> > } else {
> > ret = 1;
> > if (inet_csk(sk)->icsk_af_ops->bind_conflict(sk, tb)) {
> > - if (sk->sk_reuse && sk->sk_state != TCP_LISTEN && --attempts >= 0) {
> > + if (sk->sk_reuse && sk->sk_state != TCP_LISTEN &&
> > + smallest_size == -1 && --attempts >= 0) {
>
> I think it should be smallest_size != -1, since we really want to goto
> to the again label when hueristic is used, which in turn changes
> smallest_size.
>
Yes, this fixes the problem, not sure who wants the honors for sending a signed off
version.
--- a/net/ipv4/inet_connection_sock.c 2009-01-31 21:18:45.433239861 -0800
+++ b/net/ipv4/inet_connection_sock.c 2009-01-31 21:30:14.720825414 -0800
@@ -172,7 +172,8 @@ tb_found:
} else {
ret = 1;
if (inet_csk(sk)->icsk_af_ops->bind_conflict(sk, tb)) {
- if (sk->sk_reuse && sk->sk_state != TCP_LISTEN && --attempts >= 0) {
+ if (sk->sk_reuse && sk->sk_state != TCP_LISTEN &&
+ smallest_size != -1 && --attempts >= 0) {
spin_unlock(&head->lock);
goto again;
}
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