netdev - [PATCH RFC v2 0/4] virtio-net: add tx-hash, rx-tstamp, tx-tstamp and tx-time

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Message-Id: <20210208185558.995292-1-willemdebruijn.kernel@gmail.com>
Date:   Mon,  8 Feb 2021 13:55:54 -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,
        richardcochran@...il.com, Willem de Bruijn <willemb@...gle.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>

RFCv2 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.
Concurrently with code review I will write ballots to
https://www.oasis-open.org/committees/ballots.php?wg_abbrev=virtio

These changes are to the driver side. Evaluation additionally requires
achanges 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-2
https://github.com/wdebruij/qemu/tree/virtio-net-txhash-2

Changes RFC -> RFCv2
  - add transmit timestamp patch
  - see individual patches for other changes

Willem de Bruijn (4):
  virtio-net: support transmit hash report
  virtio-net: support receive timestamp
  virtio-net: support transmit timestamp
  virtio-net: support future packet transmit time

 drivers/net/virtio_net.c        | 193 +++++++++++++++++++++++++++++++-
 drivers/virtio/virtio_ring.c    |   3 +-
 include/linux/virtio.h          |   1 +
 include/uapi/linux/virtio_net.h |  24 +++-
 4 files changed, 214 insertions(+), 7 deletions(-)

-- 
2.30.0.478.g8a0d178c01-goog