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

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Message-ID: <6631765.x1c1LvG6uN@wuerfel>
Date:	Wed, 15 Apr 2015 16:13:37 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Ding Tianhong <dingtianhong@...wei.com>
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 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
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