[PATCH v2 0/5] vhost: introduce per-virtqueue stats API

[Maxime Coquelin <maxime.coquelin@redhat.com>]

This series introduces a new Vhost API that provides
per-virtqueue statistics to the application. It will be
generally useful, but initial motivation for this series
was to be able to get to get virtqueues stats when Virtio
RSS feature will be supported in Vhost library.

First patch is a fix that should be considered even if the
series does not make it in v22.03. Second patch introduces
the new API and generic statistics. Patch 3 makes use of
this API in Vhost PMD. The two last patches introduce more
specific counters (syscalls in DP, IOTLB cache hits and
misses).

I understand we are late in the v22.03 release cycle, and
so the series may be postponned to next release even though
it does not introduces much risks of regressions. At least
patch 1 has to be considered for this release.

Changes in v2:
=============
- Rebased on top of v22.03
- Add documentation

Maxime Coquelin (5):
  vhost: fix missing virtqueue lock protection
  vhost: add per-virtqueue statistics support
  net/vhost: move to Vhost library stats API
  vhost: add statistics for guest notifications
  vhost: add statistics for IOTLB

 doc/guides/prog_guide/vhost_lib.rst |  24 ++
 drivers/net/vhost/rte_eth_vhost.c   | 348 ++++++++++------------------
 lib/vhost/rte_vhost.h               |  99 ++++++++
 lib/vhost/socket.c                  |   4 +-
 lib/vhost/version.map               |   5 +
 lib/vhost/vhost.c                   | 124 +++++++++-
 lib/vhost/vhost.h                   |  26 ++-
 lib/vhost/virtio_net.c              |  53 +++++
 8 files changed, 450 insertions(+), 233 deletions(-)

-- 
2.35.1