netdev - Re: [PATCH net-next v2] net: clean up locking in inet_frag

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Date:	Mon, 26 Nov 2012 07:12:31 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Cong Wang <amwang@...hat.com>
Cc:	netdev@...r.kernel.org, Patrick McHardy <kaber@...sh.net>,
	Pablo Neira Ayuso <pablo@...filter.org>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH net-next v2] net: clean up locking in inet_frag_find()

On Mon, 2012-11-26 at 15:26 +0800, Cong Wang wrote:
> It is weird to take the read lock outside of inet_frag_find()
> but release it inside...  This can be improved by refactoring
> the code, that is, introducing inet{4,6}_frag_find() which call
> the their own hash function, inet{4,6}_hash_frag(), hiding the
> details from their callers.
> 
> Cc: Eric Dumazet <eric.dumazet@...il.com>
> Cc: Patrick McHardy <kaber@...sh.net>
> Cc: Pablo Neira Ayuso <pablo@...filter.org>
> Cc: David S. Miller <davem@...emloft.net>
> Signed-off-by: Cong Wang <amwang@...hat.com>
> 
> ---
>  include/net/inet_frag.h                 |   17 +++++-
>  include/net/ipv6.h                      |    3 -
>  net/ipv4/inet_fragment.c                |   82 +++++++++++++++++++++++++++++--
>  net/ipv4/ip_fragment.c                  |   16 +-----
>  net/ipv6/netfilter/nf_conntrack_reasm.c |    7 +--
>  net/ipv6/reassembly.c                   |   34 +------------
>  6 files changed, 97 insertions(+), 62 deletions(-)


Not clear to me its a win, as it adds 35 LOC. Nobody really complained
of this locking schem in the past.

Also Jesper is working on this stuff, so you dont really ease its work.



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