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

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Message-ID: <5715982A.7000801@cumulusnetworks.com>
Date:	Mon, 18 Apr 2016 19:30:02 -0700
From:	roopa <roopa@...ulusnetworks.com>
To:	David Miller <davem@...emloft.net>
CC:	eric.dumazet@...il.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 4/18/16, 5:57 PM, David Miller wrote:
> From: Eric Dumazet <eric.dumazet@...il.com>
> Date: Mon, 18 Apr 2016 14:35:56 -0700
>
>> On Mon, 2016-04-18 at 14:10 -0700, Roopa Prabhu wrote:
>>
>>> +	if (filter_mask & IFLA_STATS_FILTER_BIT(IFLA_STATS_LINK_64)) {
>>> +		struct rtnl_link_stats64 *sp;
>>> +
>>> +		attr = nla_reserve(skb, IFLA_STATS_LINK_64,
>>> +				   sizeof(struct rtnl_link_stats64));
>>> +		if (!attr)
>>> +			goto nla_put_failure;
>>> +
>>> +		sp = nla_data(attr);
>> Are you sure we have a guarantee that sp is aligned to u64 fields ?
>>
>> x86 does not care, but some arches would have a potential misalign
>> access here.
> I'll do some testing on sparc and deal with any fallout.
Thanks David. I will be happy to respin if you see problems.