linux-kernel - [PATCH v2 0/2] virtio: abstract virtqueue related methods

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Date:   Wed, 17 May 2023 10:54:22 +0800
From:   zhenwei pi <pizhenwei@...edance.com>
To:     stefanha@...hat.com, mst@...hat.com, jasowang@...hat.com
Cc:     xuanzhuo@...ux.alibaba.com,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, zhenwei pi <pizhenwei@...edance.com>
Subject: [PATCH v2 0/2] virtio: abstract virtqueue related methods

v1 -> v2:
- Suggested by MST, use fast path for vring based performance
sensitive API.
- Reduce changes in tools/virtio.

Add test result(no obvious change):
Before:
time ./vringh_test --parallel
Using CPUS 0 and 191
Guest: notified 10036893, pinged 68278
Host: notified 68278, pinged 3093532

real	0m14.463s
user	0m6.437s
sys	0m8.010s

After:
time ./vringh_test --parallel
Using CPUS 0 and 191
Guest: notified 10036709, pinged 68347
Host: notified 68347, pinged 3085292

real	0m14.196s
user	0m6.289s
sys	0m7.885s

v1:
Hi,

3 weeks ago, I posted a proposal 'Virtio Over Fabrics':
https://lists.oasis-open.org/archives/virtio-comment/202304/msg00442.html

Jason and Stefan pointed out that a non-vring based virtqueue has a
chance to overwrite virtqueue instead of using vring virtqueue.

Then I try to abstract virtqueue related methods in this series, the
details changes see the comment of patch 'virtio: abstract virtqueue related methods'.

Something is still remained:
- __virtqueue_break/__virtqueue_unbreak is supposed to use by internal
  virtio core, I'd like to rename them to vring_virtqueue_break
  /vring_virtqueue_unbreak. Is this reasonable?
- virtqueue_get_desc_addr/virtqueue_get_avail_addr/virtqueue_get_used_addr
  /virtqueue_get_vring is vring specific, I'd like to rename them like
  vring_virtqueue_get_desc_addr. Is this reasonable?
- there are still some functions in virtio_ring.c with prefix *virtqueue*,
  for example 'virtqueue_add_split', just keep it or rename it to
  'vring_virtqueue_add_split'?
zhenwei pi (2):
  virtio: abstract virtqueue related methods
  tools/virtio: implement virtqueue in test

 drivers/virtio/virtio_ring.c | 285 +++++-----------------
 include/linux/virtio.h       | 441 +++++++++++++++++++++++++++++++----
 include/linux/virtio_ring.h  |  26 +++
 tools/virtio/linux/virtio.h  | 355 +++++++++++++++++++++++++---
 4 files changed, 807 insertions(+), 300 deletions(-)

-- 
2.20.1