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

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Date:	Mon, 18 Apr 2016 23:49:55 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	roopa@...ulusnetworks.com
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

From: Roopa Prabhu <roopa@...ulusnetworks.com>
Date: Mon, 18 Apr 2016 19:40:08 -0700

> On 4/18/16, 7:22 PM, Eric Dumazet wrote:
>> On Mon, 2016-04-18 at 21:48 -0400, David Miller wrote:
>>
>>> And anyways, I get unaligned accesses without Roopa's changes :-/
>>>
>>> davem@...ience:~$ ip l l
>>> [3391066.656729] Kernel unaligned access at TPC[7d6c14] loopback_get_stats64+0x74/0xa0
>>> [3391066.672020] Kernel unaligned access at TPC[7d6c18] loopback_get_stats64+0x78/0xa0
>>> [3391066.687282] Kernel unaligned access at TPC[7d6c1c] loopback_get_stats64+0x7c/0xa0
>>> [3391066.702573] Kernel unaligned access at TPC[7d6c20] loopback_get_stats64+0x80/0xa0
>>> [3391066.717858] Kernel unaligned access at TPC[8609dc] dev_get_stats+0x3c/0xe0
>> Yes, rtnl_fill_stats() probably has the same mistake.
>>
>> commit 550bce59baf3f3059cd4ae1e268f08f2d2cb1d5c
>> Author: Roopa Prabhu <roopa@...ulusnetworks.com>
>> Date:   Fri Apr 15 20:36:25 2016 -0700
>>
>>     rtnetlink: rtnl_fill_stats: avoid an unnecssary stats copy
>>     
>>     This patch passes netlink attr data ptr directly to dev_get_stats
>>     thus elimiating a stats copy.
>>     
>>     Suggested-by: David Miller <davem@...emloft.net>
>>     Signed-off-by: Roopa Prabhu <roopa@...ulusnetworks.com>
>>     Signed-off-by: David S. Miller <davem@...emloft.net>
>>
>>
>>
> David, if you revert the one in rtnl_fill_stats, i will take care of the dev_get_stats in RTM_GETSTATS in v6.

Don't need to revert, see my idea with the IFLA_PAD attribute. :-)