netdev - Re: [PATCH] flow-dissector: Fix alignment issue in __skb_flow_get

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Date:	Fri, 10 Oct 2014 11:02:04 -0700
From:	Alexander Duyck <alexander.duyck@...il.com>
To:	David Miller <davem@...emloft.net>, alexander.h.duyck@...hat.com
CC:	eric.dumazet@...il.com, David.Laight@...LAB.COM,
	netdev@...r.kernel.org
Subject: Re: [PATCH] flow-dissector: Fix alignment issue in __skb_flow_get_ports

On 10/10/2014 10:58 AM, David Miller wrote:
> From: Alexander Duyck <alexander.h.duyck@...hat.com>
> Date: Fri, 10 Oct 2014 09:50:17 -0700
>
>> If I just use get_unaligned that is pretty easy in terms of cleanup
>> for the ports and IPv4 addresses, the IPv6 will still be a significant
>> hurdle to overcome though.
> Actually, it's not that simple.
>
> When the compiler sees things like "th->doff" it will load the 32-bit
> word that 4-bit field contains and extract the value using shifts and
> masking.
>
> So we might need to sprinkle a "attribute((packed))" here and there
> to make it work.

I'll do some digging.  I know I had this working in igb/ixgbe before so
I probably just need to add a few small tweaks to resolve the remaining
issues for v4 of the patch.

Thanks,

Alex
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