linux-kernel - Re: [PATCH] marvell sky2 driver: fix so it works without unaligned accesses

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Message-ID: <20120403091750.11eff45b@s6510.linuxnetplumber.net>
Date:	Tue, 3 Apr 2012 09:17:50 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Chris Metcalf <cmetcalf@...era.com>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] marvell sky2 driver: fix so it works without unaligned
 accesses

On Tue, 3 Apr 2012 11:13:56 -0400
Chris Metcalf <cmetcalf@...era.com> wrote:

> The driver uses a receive_new() routine that ends up requiring unaligned
> accesses in IP header processing.  If the architecture doesn't support
> efficient unaligned accesses, just copy all ingress packets to the bounce
> buffers instead.
> 
> This allows the driver to be used on the Tilera TILEmpower-Gx, since
> the tile architecture doesn't currently handle kernel unaligned accesses,
> just userspace.
> 
> Signed-off-by: Chris Metcalf <cmetcalf@...era.com>

There are many other encapsulation cases where IP header won't be
aligned. Why not just set copybreak module option to a very large value?
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