netdev - Re: [PATCH net v2] mlxbf_gige: fix receive packet race condition

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Date: Fri, 29 Dec 2023 22:50:24 +0000
From: patchwork-bot+netdevbpf@...nel.org
To: David Thompson <davthompson@...dia.com>
Cc: davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
 pabeni@...hat.com, tbogendoerfer@...e.de, horms@...nel.org, asmaa@...dia.com,
 netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net v2] mlxbf_gige: fix receive packet race condition

Hello:

This patch was applied to netdev/net.git (main)
by David S. Miller <davem@...emloft.net>:

On Wed, 20 Dec 2023 18:47:39 -0500 you wrote:
> Under heavy traffic, the BlueField Gigabit interface can
> become unresponsive. This is due to a possible race condition
> in the mlxbf_gige_rx_packet function, where the function exits
> with producer and consumer indices equal but there are remaining
> packet(s) to be processed. In order to prevent this situation,
> read receive consumer index *before* the HW replenish so that
> the mlxbf_gige_rx_packet function returns an accurate return
> value even if a packet is received into just-replenished buffer
> prior to exiting this routine. If the just-replenished buffer
> is received and occupies the last RX ring entry, the interface
> would not recover and instead would encounter RX packet drops
> related to internal buffer shortages since the driver RX logic
> is not being triggered to drain the RX ring. This patch will
> address and prevent this "ring full" condition.
> 
> [...]

Here is the summary with links:
  - [net,v2] mlxbf_gige: fix receive packet race condition
    https://git.kernel.org/netdev/net/c/dcea1bd45e6d

You are awesome, thank you!
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