Re: Re: [PATCH v2 0/2] virtio: abstract virtqueue related methods

zhenwei pi
2023-05-17T03:53:40Z

On 5/17/23 11:46, Michael S. Tsirkin wrote:
> On Wed, May 17, 2023 at 10:54:22AM +0800, zhenwei pi wrote:
>> 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?
>
> Why? These just set a flag?
>

Rename '__virtqueue_break' to 'vring_virtqueue_break', to make symbols
exported from virtio_ring.ko have unified prefix 'vring_virtqueue_xxx'.

>> - 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
>

--
zhenwei pi