netdev - Re: [PATCH net] net: hns3: add rmb() for rx description

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Date:   Tue, 5 Mar 2019 09:04:07 +0800
From:   tanhuazhong <tanhuazhong@...wei.com>
To:     David Miller <davem@...emloft.net>
CC:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <salil.mehta@...wei.com>, <yisen.zhuang@...wei.com>,
        <linuxarm@...wei.com>, <shenjian15@...wei.com>
Subject: Re: [PATCH net] net: hns3: add rmb() for rx description



On 2019/3/4 13:15, David Miller wrote:
> From: Huazhong Tan <tanhuazhong@...wei.com>
> Date: Sat, 2 Mar 2019 16:49:30 +0800
> 
>> From: Jian Shen <shenjian15@...wei.com>
>>
>> HW can not guarantee complete write desc->rx.size, even though
>> HNS3_RXD_VLD_B has been set. Driver needs to add rmb() instruction
>> to make sure desc->rx.size is always valid.
>>
>> Fixes: e55970950556 ("net: hns3: Add handling of GRO Pkts not fully RX'ed in NAPI poll")
>> Signed-off-by: Jian Shen <shenjian15@...wei.com>
>> Signed-off-by: Huazhong Tan <tanhuazhong@...wei.com>
> 
> dma_rmb() is more appropriate here and more efficient.
> 

Thanks, will send V2  to fix it.

> .
>