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Date:	Mon, 18 Apr 2016 21:32:04 -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 Mon, 2016-04-18 at 23:41 -0400, David Miller wrote:
>  
> +	/* Add a zero length NOP attribute so that the nla_data()
> +	 * of the IFLA_STATS64 will be 64-bit aligned.
> +	 */
> +#ifndef HAVE_EFFICIENT_UNALIGNED_ACCESS
> +	attr = nla_reserve(skb, IFLA_PAD, 0);
> +	if (!attr)
> +		return -EMSGSIZE;
> +#endif

You must do this only if current skb->data alignment is not correct.

(IFLA_ALIAS for example could shift your expectations)

Also you probably want to change if_nlmsg_size() to add
 + nla_total_size(0) /* IFLA_PAD */




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