netdev - Re: IP fragmentation broken in 3.6-rc ?

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Date:	Wed, 22 Aug 2012 00:07:16 +0300 (EEST)
From:	Julian Anastasov <ja@....bg>
To:	Eric Dumazet <eric.dumazet@...il.com>
cc:	Sylvain Munaut <s.munaut@...tever-company.com>,
	netdev@...r.kernel.org
Subject: Re: IP fragmentation broken in 3.6-rc ?


	Hello,

On Tue, 21 Aug 2012, Eric Dumazet wrote:

> > 	dst_update_expires will be like dst_set_expires
> > but with this difference (time_after):
> > 
> > 	if (dst->expires == 0 || time_after(expires, dst->expires) ||
> > 	    !timeout)
> 
> Hmm, all these tests are not really needed, what about :
> 
> diff --git a/net/ipv4/route.c b/net/ipv4/route.c
> index e4ba974..8d6d320 100644
> --- a/net/ipv4/route.c
> +++ b/net/ipv4/route.c
> @@ -956,7 +956,7 @@ static void ip_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
>  		dst->obsolete = DST_OBSOLETE_KILL;
>  	} else {
>  		rt->rt_pmtu = mtu;
> -		dst_set_expires(&rt->dst, ip_rt_mtu_expires);
> +		rt->dst.expires = max(1UL, jiffies + ip_rt_mtu_expires);

	The best solution, I think.

>  	}
>  }

Regards

--
Julian Anastasov <ja@....bg>
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