[PATCH 0/5] Vhost-user: add Virtio RSS support

[Maxime Coquelin]

The goal of this series is to add support for Virtio RSS
feature to the Vhost-user backend.

First patches are preliminary reworks to support variable
RSS key and indirection table length. eBPF change only adds
checks on whether the key length is 40B, it does not add
support for longer keys.

Vhost-user implementation supports up to 52B RSS key, in
order to match with the maximum supported by physical
NICs (Intel E810). Idea is that it could be used for
application like Virtio-forwarder, by programming the
Virtio device RSS key into the physical NIC and let the
physical NIC do the packets distribution.

DPDK Vhost-user backend PoC implementing the new requests
can be found here [0], it only implements the messages
handling, it does not perform any RSS for now.

[0]: https://gitlab.com/mcoquelin/dpdk-next-virtio/-/commits/vhost_user_rss_poc/

Maxime Coquelin (5):
  ebpf: pass and check RSS key length to the loader
  virtio-net: prepare for variable RSS key and indir table lengths
  virtio-net: add RSS support for Vhost backends
  docs: introduce RSS support in Vhost-user specification
  vhost-user: add RSS support

 docs/interop/vhost-user.rst       |  57 ++++++++++++
 ebpf/ebpf_rss-stub.c              |   3 +-
 ebpf/ebpf_rss.c                   |  17 ++--
 ebpf/ebpf_rss.h                   |   3 +-
 hw/net/vhost_net-stub.c           |  10 ++
 hw/net/vhost_net.c                |  22 +++++
 hw/net/virtio-net.c               |  87 +++++++++++++-----
 hw/virtio/vhost-user.c            | 146 +++++++++++++++++++++++++++++-
 include/hw/virtio/vhost-backend.h |   7 ++
 include/hw/virtio/virtio-net.h    |  16 +++-
 include/migration/vmstate.h       |  10 ++
 include/net/vhost_net.h           |   4 +
 12 files changed, 344 insertions(+), 38 deletions(-)

-- 
2.35.1