linux-kernel - Re: [PATCH] net: Add default_advmss() methods to blackhole dst

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Message-ID: <1298036005.6201.58.camel@edumazet-laptop>
Date:	Fri, 18 Feb 2011 14:33:25 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Changli Gao <xiaosuo@...il.com>
Cc:	George Spelvin <linux@...izon.com>,
	David Miller <davem@...emloft.net>,
	linux-kernel@...r.kernel.org, netdev <netdev@...r.kernel.org>,
	Roland Dreier <roland@...estorage.com>
Subject: Re: [PATCH] net: Add default_advmss() methods to blackhole dst_ops

Le vendredi 18 février 2011 à 21:29 +0800, Changli Gao a écrit :
> On Fri, Feb 18, 2011 at 9:24 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> > Le vendredi 18 février 2011 à 21:16 +0800, Changli Gao a écrit :
> >
> >> I am wondering why magic number 256 is used here. Is there a special
> >> reason? Thanks.
> >>
> >
> > It really doesnt matter. SYN message will be dropped anyway.
> >
> > 256 happens to be the default value
> > of /proc/sys/net/ipv4/route/min_adv_mss
> >
> 
> Thanks for your explaining. IMHO, ip_rt_min_advmss is better than a
> magic number, here.
> 

I had this exact idea but found we need struct net pointer to get this
value, not provided in parameters, so I falled back to the 256 value.



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