[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <20141213031338.GA12208@richard>
Date: Sat, 13 Dec 2014 11:13:38 +0800
From: Wei Yang <weiyang@...ux.vnet.ibm.com>
To: David Laight <David.Laight@...LAB.COM>
Cc: "'Eric Dumazet'" <eric.dumazet@...il.com>,
David Miller <davem@...emloft.net>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"gideonn@...lanox.com" <gideonn@...lanox.com>,
"edumazet@...gle.com" <edumazet@...gle.com>,
"amirv@...lanox.com" <amirv@...lanox.com>
Subject: Re: [PATCH net] net/mlx4_en: correct the endianness of doorbell_qpn
on big endian platform
On Mon, Dec 08, 2014 at 10:42:37PM +0800, Wei Yang wrote:
>On Mon, Dec 08, 2014 at 10:00:19AM +0000, David Laight wrote:
>>From: Eric Dumazet
>>> On Fri, 2014-12-05 at 21:31 -0800, David Miller wrote:
>>>
>>> > Guys, let's figure out what we are doing with this patch.
>>> > --
>>>
>>> Oh well, patch is fine, please apply it, thanks !
>>
>>I'm not to sure that the patch doesn't generate a software byteswap
>>followed by a byteswapping write on ppc - clearly not ideal.
>>It might even generate back to back software byteswaps.
>>
>>If the write to the doorbell register includes a byteswap on BE (ppc)
>>then there is no real value in keeping the value as BE.
>>
>>OTOH ppc ought to have ways of doing IO writes without the byteswap
>>(and byteswapping accesses to non-io memory for that matter).
>>
>>What happens on a BE system with BE peripherals is another matter.
>
>David
>
>Thanks for your comment.
>
>How about use __raw_writel() to replace the iowrite32()? Looks this is better,
>if so, I will make up another version for this.
>
Hi, David
If you prefer this way, I would like to send a new version for this.
Is it ok for you?
>>
>> David
>>
>
>--
>Richard Yang
>Help you, Help me
--
Richard Yang
Help you, Help me
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Powered by blists - more mailing lists