netdev - af-packet tpacket_rcv - why is status flushed before the packet-payload ...

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Message-ID: <BANLkTikjntd2Da_gScrpGb3n1-jzj+04Bg@mail.gmail.com>
Date:	Fri, 24 Jun 2011 11:20:35 -0400
From:	chetan loke <loke.chetan@...il.com>
To:	netdev@...r.kernel.org
Subject: af-packet tpacket_rcv - why is status flushed before the
 packet-payload ...

Hi,

in tpacket_rcv() - this is the flushing sequence ...

1)
__packet_set_status(po, h.raw, status);

2)
smp_mb();

3)
#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
flush-the-payload
#endif

Why is it done this way?

Shouldn't we be flushing the packet_status after flushing the payload?
So 1 and 3 should be swapped, no?

Chetan Loke
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