From: Xuan Ding <xuan.d...@intel.com>
Hi everyone,
The presence of an asynchronous path allows applications to offload memory
copies to DMA engine, so as to save CPU cycles and improve the copy
performance. This patch set is a draft implementation for split
ring in vhost async dequeue data path. The code is based on latest
enqueue changes [1].
This patch set is a new design and implementation of [2]. Since dmadev
is introduced in 21.11, to simplify application logics, this patch
integrates dmadev in vhost. With dmadev integrated, vhost supports M:N
mapping between vrings and DMA virtual channels. Specifically, one vring
can use multiple different DMA channels and one DMA channel can be
shared by multiple vrings at the same time.
A new asynchronous dequeue function is introduced:
1) rte_vhost_async_try_dequeue_burst(int vid, uint16_t queue_id,
struct rte_mempool *mbuf_pool, struct rte_mbuf **pkts,
uint16_t count, int *nr_inflight,
uint16_t dma_id, uint16_t dma_vchan)
Receive packets from the guest and offloads copies to DMA
virtual channel.
[1] https://mails.dpdk.org/archives/dev/2021-December/231889.html.
[2] https://mails.dpdk.org/archives/dev/2021-September/218591.html.
Your comments are welcomed and appreciated!
Thanks!
Xuan
Xuan Ding (2):
vhost: support async dequeue for split ring
examples/vhost: support async dequeue data path
doc/guides/sample_app_ug/vhost.rst | 9 +-
examples/vhost/main.c | 305 ++++++++++++------
examples/vhost/main.h | 35 +-
examples/vhost/virtio_net.c | 16 +-
lib/vhost/rte_vhost_async.h | 29 ++
lib/vhost/version.map | 1 +
lib/vhost/vhost.h | 1 +
lib/vhost/virtio_net.c | 493 +++++++++++++++++++++++++++++
8 files changed, 783 insertions(+), 106 deletions(-)
--
2.17.1
