linux-kernel - Re: [PATCH RFC v2 0/2] virtio-net: add flow filter for receive timestamps

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Message-ID: <willemdebruijn.kernel.279585f37ad8@gmail.com>
Date: Sun, 01 Feb 2026 16:00:07 -0500
From: Willem de Bruijn <willemdebruijn.kernel@...il.com>
To: Steffen Trumtrar <s.trumtrar@...gutronix.de>, 
 "Michael S. Tsirkin" <mst@...hat.com>, 
 Jason Wang <jasowang@...hat.com>, 
 Xuan Zhuo <xuanzhuo@...ux.alibaba.com>, 
 "David S. Miller" <davem@...emloft.net>, 
 Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, 
 Paolo Abeni <pabeni@...hat.com>, 
 Richard Cochran <richardcochran@...il.com>, 
 Willem de Bruijn <willemdebruijn.kernel@...il.com>, 
 Andrew Lunn <andrew+netdev@...n.ch>, 
 Eugenio Pérez <eperezma@...hat.com>
Cc: virtualization@...ts.linux.dev, 
 netdev@...r.kernel.org, 
 linux-kernel@...r.kernel.org, 
 Steffen Trumtrar <s.trumtrar@...gutronix.de>
Subject: Re: [PATCH RFC v2 0/2] virtio-net: add flow filter for receive
 timestamps

Steffen Trumtrar wrote:
> This series tries to pick up the work on the virtio-net timestamping
> feature from Willem de Bruijn.
> 
> Original series
>     Message-Id: 20210208185558.995292-1-willemdebruijn.kernel@...il.com
>     Subject: [PATCH RFC v2 0/4] virtio-net: add tx-hash, rx-tstamp,
>     tx-tstamp and tx-time
>     From: Willem de Bruijn <willemb@...gle.com>
> 
>     RFC for four new features to the virtio network device:
> 
>     1. pass tx flow state to host, for routing + telemetry
>     2. pass rx tstamp to guest, for better RTT estimation
>     3. pass tx tstamp to guest, idem
>     3. pass tx delivery time to host, for accurate pacing
> 
>     All would introduce an extension to the virtio spec.
> 
> The changes in this series are to the driver side. For the changes to qemu see:
>     https://github.com/strumtrar/qemu/tree/v10.2.0/virtio-rx-stamps    
> 
> Currently only virtio-net is supported. Performance was tested with
> pktgen which doesn't show a decrease in transfer speeds.
> 
> As these patches are now mostly different from the initial patchset, I removed
> the Signed-off-bys from Willem, so he mustn't be ashamed of what his work evolved to ;)

Good to see this picked up. I would also still like to see support in
virtio-net for HW timestamps pass-through for virtio-net.

> Signed-off-by: Steffen Trumtrar <s.trumtrar@...gutronix.de>
> ---
> Changes in v2:
> - rework patches to use flow filter instead of feature flag
> - Link to v1: https://lore.kernel.org/r/20231218-v6-7-topic-virtio-net-ptp-v1-0-cac92b2d8532@pengutronix.de
> 
> ---
> Steffen Trumtrar (2):
>       tun: support rx-tstamp
>       virtio-net: support receive timestamp
> 
>  drivers/net/tun.c               |  30 +++++----
>  drivers/net/virtio_net.c        | 136 ++++++++++++++++++++++++++++++++++++----
>  include/uapi/linux/virtio_net.h |   9 +++
>  3 files changed, 151 insertions(+), 24 deletions(-)
> ---
> base-commit: 8f0b4cce4481fb22653697cced8d0d04027cb1e8
> change-id: 20231218-v6-7-topic-virtio-net-ptp-3df023bc4f4d
> 
> Best regards,
> -- 
> Steffen Trumtrar <s.trumtrar@...gutronix.de>
>