netdev - Re: [PATCH net-next 2/2] packet: account statistics only in tpacket_stats

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Date:	Thu, 25 Apr 2013 01:30:03 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	dborkman@...hat.com
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH net-next 2/2] packet: account statistics only in
 tpacket_stats_u

From: Daniel Borkmann <dborkman@...hat.com>
Date: Fri, 19 Apr 2013 18:12:29 +0200

> Currently, packet_sock has a struct tpacket_stats stats member for
> TPACKET_V1 and TPACKET_V2 statistic accounting, and with TPACKET_V3
> ``union tpacket_stats_u stats_u'' was introduced, where however only
> statistics for TPACKET_V3 are held, and when copied to user space,
> TPACKET_V3 does some hackery and access also tpacket_stats' stats,
> although everything could have been done within the union itself.
> 
> Unify accounting within the tpacket_stats_u union so that we can
> remove 8 bytes from packet_sock that are there unnecessary. Note that
> even if we switch to TPACKET_V3 and would use non mmap(2)ed option,
> this still works due to the union with same types + offsets, that are
> exposed to the user space.
> 
> Signed-off-by: Daniel Borkmann <dborkman@...hat.com>

Applied.
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