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Date: Tue, 7 Oct 2008 09:36:26 -0300
From: Arnaldo Carvalho de Melo <acme@...hat.com>
To: KOVACS Krisztian <hidden@....bme.hu>
Cc: David Miller <davem@...emloft.net>, kaber@...sh.net,
netdev@...r.kernel.org, netfilter-devel@...r.kernel.org
Subject: Re: [net-next PATCH] Don't lookup the socket if there's a socket
attached to the skb (was: Re: [net-next PATCH 10/16] Don't lookup
the socket if there's a socket attached to the skb)
Em Tue, Oct 07, 2008 at 09:59:29AM +0200, KOVACS Krisztian escreveu:
> Hi,
>
> On Fri, 2008-10-03 at 10:47 -0300, Arnaldo Carvalho de Melo wrote:
> > > Those functions don't have access to the skb so unless we change the
> > > signature they won't be able to steal the reference.
> >
> > Indeed, but we should try to have the main TCP code flow clean, ditto for
> > DCCP, free of such details, so after this activitity settles down I'll
> > submit something like the patch below.
> >
> > If Dave agrees and you feel like merging it on your current patchset,
> > feel free to do it.
>
> And here's the modified use-cached-sk-if-present patch built on top of
> the previous two x_lookup_skb() helper patches.
>
> --
> KOVACS Krisztian
>
>
> Don't lookup the socket if there's a socket attached to the skb
>
> Use the socket cached in the skb if it's present.
>
> Signed-off-by: KOVACS Krisztian <hidden@....bme.hu>
> ---
>
> include/net/inet6_hashtables.h | 12 ++++++++----
> include/net/inet_hashtables.h | 9 ++++++---
> include/net/sock.h | 12 ++++++++++++
> net/ipv4/udp.c | 9 ++++++---
> net/ipv6/udp.c | 9 ++++++---
> 5 files changed, 38 insertions(+), 13 deletions(-)
>
>
> diff --git a/include/net/inet6_hashtables.h b/include/net/inet6_hashtables.h
> index 995efbb..f74665d 100644
> --- a/include/net/inet6_hashtables.h
> +++ b/include/net/inet6_hashtables.h
> @@ -96,10 +96,14 @@ static inline struct sock *__inet6_lookup_skb(struct inet_hashinfo *hashinfo,
> const __be16 sport,
> const __be16 dport)
> {
> - return __inet6_lookup(dev_net(skb->dst->dev), hashinfo,
> - &ipv6_hdr(skb)->saddr, sport,
> - &ipv6_hdr(skb)->daddr, ntohs(dport),
> - inet6_iif(skb));
> + struct sock *sk;
> +
> + if (unlikely(sk = skb_steal_sock(skb)))
> + return sk;
> + else return __inet6_lookup(dev_net(skb->dst->dev), hashinfo,
> + &ipv6_hdr(skb)->saddr, sport,
> + &ipv6_hdr(skb)->daddr, ntohs(dport),
> + inet6_iif(skb));
> }
>
> extern struct sock *inet6_lookup(struct net *net, struct inet_hashinfo *hashinfo,
> diff --git a/include/net/inet_hashtables.h b/include/net/inet_hashtables.h
> index 3522bbc..72b9ba5 100644
> --- a/include/net/inet_hashtables.h
> +++ b/include/net/inet_hashtables.h
> @@ -378,11 +378,14 @@ static inline struct sock *__inet_lookup_skb(struct inet_hashinfo *hashinfo,
> const __be16 sport,
> const __be16 dport)
> {
> + struct sock *sk;
> const struct iphdr *iph = ip_hdr(skb);
>
> - return __inet_lookup(dev_net(skb->dst->dev), hashinfo,
> - iph->saddr, sport,
> - iph->daddr, dport, inet_iif(skb));
> + if (unlikely(sk = skb_steal_sock(skb)))
> + return sk;
> + else return __inet_lookup(dev_net(skb->dst->dev), hashinfo,
> + iph->saddr, sport,
> + iph->daddr, dport, inet_iif(skb));
return on a different line, please:
else
return
> }
>
> extern int __inet_hash_connect(struct inet_timewait_death_row *death_row,
> diff --git a/include/net/sock.h b/include/net/sock.h
> index 75a312d..18f9670 100644
> --- a/include/net/sock.h
> +++ b/include/net/sock.h
> @@ -1324,6 +1324,18 @@ static inline void sk_change_net(struct sock *sk, struct net *net)
> sock_net_set(sk, hold_net(net));
> }
>
> +static inline struct sock *skb_steal_sock(struct sk_buff *skb)
> +{
> + if (unlikely(skb->sk)) {
> + struct sock *sk = skb->sk;
> +
> + skb->destructor = NULL;
> + skb->sk = NULL;
> + return sk;
> + }
> + return NULL;
> +}
> +
> extern void sock_enable_timestamp(struct sock *sk);
> extern int sock_get_timestamp(struct sock *, struct timeval __user *);
> extern int sock_get_timestampns(struct sock *, struct timespec __user *);
> diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
> index 8369f4d..219a4aa 100644
> --- a/net/ipv4/udp.c
> +++ b/net/ipv4/udp.c
> @@ -306,11 +306,14 @@ static inline struct sock *__udp4_lib_lookup_skb(struct sk_buff *skb,
> __be16 sport, __be16 dport,
> struct hlist_head udptable[])
> {
> + struct sock *sk;
> const struct iphdr *iph = ip_hdr(skb);
>
> - return __udp4_lib_lookup(dev_net(skb->dst->dev), iph->saddr, sport,
> - iph->daddr, dport, inet_iif(skb),
> - udptable);
> + if (unlikely(sk = skb_steal_sock(skb)))
> + return sk;
> + else return __udp4_lib_lookup(dev_net(skb->dst->dev), iph->saddr, sport,
> + iph->daddr, dport, inet_iif(skb),
> + udptable);
ditto
> }
>
> struct sock *udp4_lib_lookup(struct net *net, __be32 saddr, __be16 sport,
> diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
> index ce26c41..95a2b56 100644
> --- a/net/ipv6/udp.c
> +++ b/net/ipv6/udp.c
> @@ -111,11 +111,14 @@ static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb,
> __be16 sport, __be16 dport,
> struct hlist_head udptable[])
> {
> + struct sock *sk;
> struct ipv6hdr *iph = ipv6_hdr(skb);
>
> - return __udp6_lib_lookup(dev_net(skb->dst->dev), &iph->saddr, sport,
> - &iph->daddr, dport, inet6_iif(skb),
> - udptable);
> + if (unlikely(sk = skb_steal_sock(skb)))
> + return sk;
> + else return __udp6_lib_lookup(dev_net(skb->dst->dev), &iph->saddr, sport,
> + &iph->daddr, dport, inet6_iif(skb),
> + udptable);
ditto
After you fix this up, please add:
Acked-by: Arnaldo Carvalho de Melo <acme@...hat.com>
--
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