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Subject: Re: [PATCH net v2] net: mana: Ring doorbell at 4 CQ wraparounds
From: patchwork-bot+netdevbpf@kernel.org
Message-Id: 
 <177225000804.2855218.9386044687164438073.git-patchwork-notify@kernel.org>
Date: Sat, 28 Feb 2026 03:40:08 +0000
References: <20260226192833.1050807-1-longli@microsoft.com>
In-Reply-To: <20260226192833.1050807-1-longli@microsoft.com>
To: Long Li <longli@microsoft.com>
Cc: kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org,
 decui@microsoft.com, andrew+netdev@lunn.ch, davem@davemloft.net,
 edumazet@google.com, kuba@kernel.org, pabeni@redhat.com,
 shradhagupta@linux.microsoft.com, ernis@linux.microsoft.com,
 linux-hyperv@vger.kernel.org, netdev@vger.kernel.org,
 linux-kernel@vger.kernel.org, stable@vger.kernel.org

Hello:

This patch was applied to netdev/net.git (main)
by Jakub Kicinski <kuba@kernel.org>:

On Thu, 26 Feb 2026 11:28:33 -0800 you wrote:
> MANA hardware requires at least one doorbell ring every 8 wraparounds
> of the CQ. The driver rings the doorbell as a form of flow control to
> inform hardware that CQEs have been consumed.
> 
> The NAPI poll functions mana_poll_tx_cq() and mana_poll_rx_cq() can
> poll up to CQE_POLLING_BUFFER (512) completions per call. If the CQ
> has fewer than 512 entries, a single poll call can process more than
> 4 wraparounds without ringing the doorbell. The doorbell threshold
> check also uses ">" instead of ">=", delaying the ring by one extra
> CQE beyond 4 wraparounds. Combined, these issues can cause the driver
> to exceed the 8-wraparound hardware limit, leading to missed
> completions and stalled queues.
> 
> [...]

Here is the summary with links:
  - [net,v2] net: mana: Ring doorbell at 4 CQ wraparounds
    https://git.kernel.org/netdev/net/c/dabffd08545f

You are awesome, thank you!
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