netdev - Re: [PATCH net-next 2/6] net: hip04: use the big endian for tx and rx desc

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Message-ID: <552F55D6.1040307@huawei.com>
Date:	Thu, 16 Apr 2015 14:25:26 +0800
From:	Ding Tianhong <dingtianhong@...wei.com>
To:	Arnd Bergmann <arnd@...db.de>
CC:	<davem@...emloft.net>, <grant.likely@...aro.org>,
	<sergei.shtylyov@...entembedded.com>,
	<linux-arm-kernel@...ts.infradead.org>, <eric.dumazet@...il.com>,
	<zhangfei.gao@...aro.org>, <joe@...ches.com>,
	<netdev@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<linux@....linux.org.uk>
Subject: Re: [PATCH net-next 2/6] net: hip04: use the big endian for tx and
 rx desc

On 2015/4/15 22:13, Arnd Bergmann wrote:
> On Wednesday 15 April 2015 20:30:04 Ding Tianhong wrote:
>> The hip04 ethernet use the big endian for tx and rx, so set desc to
>> big endian and remove the unused next_addr.
> 
> I don't understand:
> 
>> diff --git a/drivers/net/ethernet/hisilicon/hip04_eth.c b/drivers/net/ethernet/hisilicon/hip04_eth.c
>> index b0a7f03..6473462 100644
>> --- a/drivers/net/ethernet/hisilicon/hip04_eth.c
>> +++ b/drivers/net/ethernet/hisilicon/hip04_eth.c
>> @@ -132,19 +132,18 @@
>>  #define HIP04_MIN_TX_COALESCE_FRAMES   1
>>  
>>  struct tx_desc {
>> -       u32 send_addr;
>> -       u32 send_size;
>> -       u32 next_addr;
>> -       u32 cfg;
>> -       u32 wb_addr;
>> +       __be32 send_addr;
>> +       __be32 send_size;
>> +       __be32 cfg;
>> +       __be32 wb_addr;
>>  } __aligned(64);
> 
> I would think this is a hardware structure, does this not break
> access to the cfg and wb_addr fields if you remove next_addr?
> 
> 	Arnd
> 
good cache, I make a mistake here, thanks.

> .
> 


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