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Date:   Fri, 12 Jan 2018 13:21:59 -0800
From:   Eric Dumazet <>
To:     Saeed Mahameed <>,
        Jason Gunthorpe <>,
        Jianchao Wang <>
Subject: Re: [PATCH] net/mlx4_en: ensure rx_desc updating reaches HW before
 prod db updating

On Fri, 2018-01-12 at 13:01 -0800, Saeed Mahameed wrote:

> which is better to grasp ?:
> update_doorbell() {
>     dma_wmb();
>     ring->db = prod;
> }

This one is IMO the most secure one (least surprise)

Considering the time it took to discover this bug, I would really play

But obviously I do not maintain mlx4.

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