From: patchwork-bot+netdevbpf@kernel.org
To: Hamza Mahfooz <hamzamahfooz@linux.microsoft.com>
Cc: netdev@vger.kernel.org, haiyangz@microsoft.com,
wei.liu@kernel.org, decui@microsoft.com, andrew+netdev@lunn.ch,
davem@davemloft.net, edumazet@kernel.org, kuba@kernel.org,
pabeni@redhat.com, kotaranov@microsoft.com, horms@kernel.org,
ast@kernel.org, daniel@iogearbox.net, hawk@kernel.org,
john.fastabend@gmail.com, sdf@fomichev.me,
linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-rdma@vger.kernel.org, bpf@vger.kernel.org
Subject: Re: [PATCH net-next v3] net: mana: add BQL support
Date: Tue, 20 Oct 2026 21:00:44 +0000 [thread overview]
Message-ID: <179253004477.208021.12583295837722282628.git-patchwork-notify@kernel.org> (raw)
In-Reply-To: <20261013214937.145312-1-hamzamahfooz@linux.microsoft.com>
Hello:
This patch was applied to netdev/net-next.git (main)
by Jakub Kicinski <kuba@kernel.org>:
On Tue, 13 Oct 2026 17:49:37 -0400 you wrote:
> MANA doesn't support byte queue limits, so each TX queue can hold 256
> WQEs by default, and up to 16384, of up to 64 KB TSO packets, before the
> qdisc layer sees any backpressure. This adds latency to all the flows
> sharing a queue, and defeats AQM qdiscs such as fq_codel, which rely on
> BQL to keep the driver queues short.
>
> Report the bytes queued and completed to BQL, except for the XDP_TX and
> XDP_REDIRECT frames. These share the SQs, but bypass the qdisc and are
> sent even when the queue is stopped, so BQL can't hold them back.
> Counting them would let sustained XDP traffic keep the queue stopped,
> starving the stack, and the TX watchdog would then either fire while the
> completions still arrive, or, if the XDP sends refreshed trans_start,
> not fire when the completions stop. The XDP SKBs are marked in their
> skb->cb, next to the WQE size, so that their completions are skipped as
> well.
>
> [...]
Here is the summary with links:
- [net-next,v3] net: mana: add BQL support
https://git.kernel.org/netdev/net-next/c/799cdeaa5c39
You are awesome, thank you!
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prev parent reply other threads:[~2026-10-20 21:00 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-13 21:49 Hamza Mahfooz
2026-10-17 23:03 ` Haiyang Zhang
2026-10-20 21:00 ` patchwork-bot+netdevbpf [this message]
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