patches for DPDK stable branches
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From: Maxime Coquelin <>
To: Matan Azrad <>
Subject: Re: [dpdk-stable] [PATCH] vdpa/mlx5: fix completion queue polling
Date: Fri, 18 Sep 2020 12:33:56 +0200
Message-ID: <> (raw)
In-Reply-To: <>

On 9/10/20 9:20 AM, Matan Azrad wrote:
> The CQ polling is done in order to notify the guest about new traffic
> bursts and to release FW resources for the next bursts management.
> When HW is faster than SW, it may be that all the FW resources are busy
> in SW due to late polling.
> In this case, due to wrong WQE counter masking, the fullness
> calculation of the completions number is 0 while the queue is full.
> Change the WQE counter masking to 16-bit wideness instead of the CQ
> size mask as defined by the CQE format.
> Fixes: c5f714e50b0e ("vdpa/mlx5: optimize completion queue poll")
> Cc:
> Signed-off-by: Matan Azrad <>
> Acked-by: Xueming Li <>
> ---
>  drivers/vdpa/mlx5/mlx5_vdpa_event.c | 7 +++----
>  1 file changed, 3 insertions(+), 4 deletions(-)

Reviewed-by: Maxime Coquelin <>


  reply	other threads:[~2020-09-18 10:34 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-10  7:20 Matan Azrad
2020-09-18 10:33 ` Maxime Coquelin [this message]
2020-09-18 12:29 ` Maxime Coquelin

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