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

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Message-Id: <20190303.211518.1265133811120263144.davem@davemloft.net>
Date:   Sun, 03 Mar 2019 21:15:18 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     tanhuazhong@...wei.com
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

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.