netdev - [PATCH rfc 0/3] virtio-net: add tx-hash, rx-tstamp and tx-tstamp

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Date:   Mon, 28 Dec 2020 11:22:30 -0500
From:   Willem de Bruijn <willemdebruijn.kernel@...il.com>
To:     virtualization@...ts.linux-foundation.org
Cc:     netdev@...r.kernel.org, mst@...hat.com, jasowang@...hat.com,
        Willem de Bruijn <willemb@...gle.com>
Subject: [PATCH rfc 0/3] virtio-net: add tx-hash, rx-tstamp and tx-tstamp

From: Willem de Bruijn <willemb@...gle.com>

RFC for three new features to the virtio network device:

1. pass tx flow hash and state to host, for routing + telemetry
2. pass rx tstamp to guest, for better RTT estimation
3. pass tx tstamp to host, for accurate pacing

All three would introduce an extension to the virtio spec.
I assume this would require opening three ballots against v1.2 at
https://www.oasis-open.org/committees/ballots.php?wg_abbrev=virtio

This RFC is to informally discuss the proposals first.

The patchset is against v5.10. Evaluation additionally requires
changes to qemu and at least one back-end. I implemented preliminary
support in Linux vhost-net. Both patches available through github at

https://github.com/wdebruij/linux/tree/virtio-net-txhash-1
https://github.com/wdebruij/qemu/tree/virtio-net-txhash-1

Willem de Bruijn (3):
  virtio-net: support transmit hash report
  virtio-net: support receive timestamp
  virtio-net: support transmit timestamp

 drivers/net/virtio_net.c        | 52 +++++++++++++++++++++++++++++++--
 include/uapi/linux/virtio_net.h | 23 ++++++++++++++-
 2 files changed, 71 insertions(+), 4 deletions(-)

-- 
2.29.2.729.g45daf8777d-goog