netdev - Re: [PATCH net V2] virtio_net: fix alignment for virtio_net_hdr_v1

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Message-Id: 
 <176230621499.3052151.14134188371623590372.git-patchwork-notify@kernel.org>
Date: Wed, 05 Nov 2025 01:30:14 +0000
From: patchwork-bot+netdevbpf@...nel.org
To: Jason Wang <jasowang@...hat.com>
Cc: mst@...hat.com, xuanzhuo@...ux.alibaba.com, eperezma@...hat.com,
 andrew+netdev@...n.ch, davem@...emloft.net, edumazet@...gle.com,
 kuba@...nel.org, pabeni@...hat.com, virtualization@...ts.linux.dev,
 netdev@...r.kernel.org, linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH net V2] virtio_net: fix alignment for
 virtio_net_hdr_v1_hash

Hello:

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

On Fri, 31 Oct 2025 14:05:51 +0800 you wrote:
> From: "Michael S. Tsirkin" <mst@...hat.com>
> 
> Changing alignment of header would mean it's no longer safe to cast a
> 2 byte aligned pointer between formats. Use two 16 bit fields to make
> it 2 byte aligned as previously.
> 
> This fixes the performance regression since
> commit ("virtio_net: enable gso over UDP tunnel support.") as it uses
> virtio_net_hdr_v1_hash_tunnel which embeds
> virtio_net_hdr_v1_hash. Pktgen in guest + XDP_DROP on TAP + vhost_net
> shows the TX PPS is recovered from 2.4Mpps to 4.45Mpps.
> 
> [...]

Here is the summary with links:
  - [net,V2] virtio_net: fix alignment for virtio_net_hdr_v1_hash
    https://git.kernel.org/netdev/net/c/c3838262b824

You are awesome, thank you!
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