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From: xuan.ding@intel.com
To: maxime.coquelin@redhat.com,
chenbo.xia@intel.com
Cc: dev@dpdk.org, jiayu.hu@intel.com, cheng1.jiang@intel.com,
sunil.pai.g@intel.com, liangma@liangbit.com,
Xuan Ding <xuan.ding@intel.com>
Subject: [PATCH v1 0/5] vhost: support async dequeue data path
Date: Thu, 7 Apr 2022 15:25:41 +0000
Message-Id: <20220407152546.38167-1-xuan.ding@intel.com>
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From: Xuan Ding <xuan.ding@intel.com>
The presence of asynchronous path allows applications to offload
memory copies to DMA engine, so as to save CPU cycles and improve
the copy performance. This patch implements vhost async dequeue data
path for split ring.
This patch set is a new design and implementation of [2]. Since dmadev
was introduced in DPDK 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 vchan_id)
Receive packets from the guest and offloads copies to DMA
virtual channel.
[1] https://mails.dpdk.org/archives/dev/2022-February/234555.html
[2] https://mails.dpdk.org/archives/dev/2021-September/218591.html
RFC v3 -> v1:
* add sync and async path descriptor to mbuf refactoring
* add API description in docs
RFC v2 -> RFC v3:
* rebase to latest DPDK version
RFC v1 -> RFC v2:
* fix one bug in example
* rename vchan to vchan_id
* check if dma_id and vchan_id valid
* rework all the logs to new standard
Xuan Ding (5):
vhost: prepare sync for descriptor to mbuf refactoring
vhost: prepare async for descriptor to mbuf refactoring
vhost: merge sync and async descriptor to mbuf filling
vhost: support async dequeue for split ring
examples/vhost: support async dequeue data path
doc/guides/prog_guide/vhost_lib.rst | 7 +
doc/guides/rel_notes/release_22_07.rst | 4 +
doc/guides/sample_app_ug/vhost.rst | 9 +-
examples/vhost/main.c | 292 +++++++++++-----
examples/vhost/main.h | 35 +-
examples/vhost/virtio_net.c | 16 +-
lib/vhost/rte_vhost_async.h | 33 ++
lib/vhost/version.map | 3 +
lib/vhost/vhost.h | 1 +
lib/vhost/virtio_net.c | 459 ++++++++++++++++++++++---
10 files changed, 711 insertions(+), 148 deletions(-)
--
2.17.1