linux-kernel - Re: [PATCH] net/mlx4_en: ensure rx_desc updating reaches HW before prod db updating

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Date:   Sun, 14 Jan 2018 10:40:10 +0800
From:   "jianchao.wang" <jianchao.w.wang@...cle.com>
To:     Eric Dumazet <eric.dumazet@...il.com>,
        Jason Gunthorpe <jgg@...pe.ca>
Cc:     tariqt@...lanox.com, junxiao.bi@...cle.com, netdev@...r.kernel.org,
        linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
        Saeed Mahameed <saeedm@...lanox.com>
Subject: Re: [PATCH] net/mlx4_en: ensure rx_desc updating reaches HW before
 prod db updating

Dear all

Thanks for the kindly response and reviewing. That's really appreciated.

On 01/13/2018 12:46 AM, Eric Dumazet wrote:
>> Does this need to be dma_wmb(), and should it be in
>> mlx4_en_update_rx_prod_db ?
>>
> +1 on dma_wmb()
> 
> On what architecture bug was observed ?
This issue was observed on x86-64.
And I will send a new patch, in which replace wmb() with dma_wmb(), to customer
to confirm.

Thanks
Jianchao