Subject: Re: [PATCH] marvell sky2 driver: fix so it works without unaligned accesses

From: Stephen Hemminger <[email-masked]>
Date: Tue, 3 Apr 2012 09:17:50 -0700

On Tue, 3 Apr 2012 11:13:56 -0400
Chris Metcalf <[email-masked]> 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 <[email-masked]>

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?