Message ID | 20220516024325.96067-1-xuan.ding@intel.com (mailing list archive) |
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Headers |
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Series |
vhost: support async dequeue data path
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Message
Ding, Xuan
May 16, 2022, 2:43 a.m. UTC
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 set implements vhost async dequeue data path
for split ring. The code is based on latest enqueue changes [1].
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
v6->v7:
* correct code formatting
* change some functions to inline
v5->v6:
* adjust EXPERIMENTAL header
v4->v5:
* rebase to latest DPDK
* add some checks
v3->v4:
* fix CI build warnings
* adjust some indentation
* pass vq instead of queue_id
v2->v3:
* fix mbuf not updated correctly for large packets
v1->v2:
* fix a typo
* fix a bug in desc_to_mbuf filling
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 | 5 +
doc/guides/sample_app_ug/vhost.rst | 9 +-
examples/vhost/main.c | 286 ++++++++++-----
examples/vhost/main.h | 32 +-
examples/vhost/virtio_net.c | 16 +-
lib/vhost/rte_vhost_async.h | 37 ++
lib/vhost/version.map | 2 +-
lib/vhost/vhost.h | 1 +
lib/vhost/virtio_net.c | 473 ++++++++++++++++++++++---
10 files changed, 716 insertions(+), 152 deletions(-)