netdev - Re: [PATCH net-next v5] rtnetlink: add new RTM

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Date:	Tue, 19 Apr 2016 11:45:27 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	roopa@...ulusnetworks.com, netdev@...r.kernel.org,
	jhs@...atatu.com, tgraf@...g.ch, nicolas.dichtel@...nd.com
Subject: Re: [PATCH net-next v5] rtnetlink: add new RTM_GETSTATS message to
 dump link stats

On Tue, 2016-04-19 at 14:31 -0400, David Miller wrote:

> 
> Here is the final patch I'm about to push out, thanks a lot Eric.
> 
> Roopa, please adjust your GETSTATS patch as needed (I think you need
> to adjust the SELinux table entry as well) and we can integrate that
> too.
> 
> ====================
> [PATCH] net: Align IFLA_STATS64 attributes properly on architectures that need it.
> 
> Since the nlattr header is 4 bytes in size, it can cause the netlink
> attribute payload to not be 8-byte aligned.
> 
> This is particularly troublesome for IFLA_STATS64 which contains 64-bit
> statistic values.
> 
> Solve this by creating a dummy IFLA_PAD attribute which has a payload
> which is zero bytes in size.  When HAVE_EFFICIENT_UNALIGNED_ACCESS is
> false, we insert an IFLA_PAD attribute into the netlink response when
> necessary such that the IFLA_STATS64 payload will be properly aligned.
> 
> With help and suggestions from Eric Dumazet.
> 
> Signed-off-by: David S. Miller <davem@...emloft.net>
> ---
>  include/uapi/linux/if_link.h |  1 +
>  net/core/rtnetlink.c         | 19 +++++++++++++++++++
>  2 files changed, 20 insertions(+)

LGTM, thanks David ;)