[dpdk-dev] [PATCH v8 0/8] vhost-user multiple queues enabling
Yuanhan Liu
yuanhan.liu at linux.intel.com
Thu Oct 22 14:35:48 CEST 2015
This patch set enables vhost-user multiple queue feature.
v8:
- put SET_VRING_ENABLE() patch before the patch actually
enable mq, since that make more sense.
- don't change the kickfd reset behavior for patch 3
- move virt_queue field to the end of virtio_net struct.
- comment and type fixe
v7:
- Removed vhost-user mq examples in this patch set
Because the example leverages the hardware VMDq feature to
demonstrate the mq feature, which introduces too much
limitation, yet it's turned out to be not elegant.
- Commit log fixes
- Dropped the patch to fix RESET_OWNER handling, as I found
Jerome's solution works as well, and it makes more sense to
me:
http://dpdk.org/dev/patchwork/project/dpdk/list/?submitter=354
Overview
========
It depends on some QEMU patches that has already been merged to upstream.
Those qemu patches introduce some new vhost-user messages, for vhost-user
mq enabling negotiation. Here is the main negotiation steps (Qemu
as master, and DPDK vhost-user as slave):
- Master queries features by VHOST_USER_GET_FEATURES from slave
- Check if VHOST_USER_F_PROTOCOL_FEATURES exist. If not, mq is not
supported. (check patch 1 for why VHOST_USER_F_PROTOCOL_FEATURES
is introduced)
- Master then sends another command, VHOST_USER_GET_QUEUE_NUM, for
querying how many queues the slave supports.
Master will compare the result with the requested queue number.
Qemu exits if the former is smaller.
- Master then tries to initiate all queue pairs by sending some vhost
user commands, including VHOST_USER_SET_VRING_CALL, which will
trigger the slave to do related vring setup, such as vring allocation.
Till now, all necessary initiation and negotiation are done. And master
could send another message, VHOST_USER_SET_VRING_ENABLE, to enable/disable
a specific queue dynamically later.
Patchset
========
Patch 1-6 are all prepare works for enabling mq; they are all atomic
changes, with "do not breaking anything" beared in mind while making
them.
Patch 7 actually enables mq feature, by setting two key feature flags.
Test with OVS
=============
Marcel created a simple yet quite clear test guide with OVS at:
http://wiki.qemu.org/Features/vhost-user-ovs-dpdk
---
Changchun Ouyang (3):
vhost: rxtx: use queue id instead of constant ring index
virtio: fix deadloop due to reading virtio_net_config incorrectly
vhost: add VHOST_USER_SET_VRING_ENABLE message
Yuanhan Liu (5):
vhost-user: add protocol features support
vhost-user: add VHOST_USER_GET_QUEUE_NUM message
vhost: vring queue setup for multiple queue support
vhost-user: enable vhost-user multiple queue
doc: update release note for vhost-user mq support
doc/guides/rel_notes/release_2_2.rst | 4 +
drivers/net/virtio/virtio_ethdev.c | 16 ++-
lib/librte_vhost/rte_virtio_net.h | 13 +-
lib/librte_vhost/vhost_rxtx.c | 53 +++++---
lib/librte_vhost/vhost_user/vhost-net-user.c | 25 +++-
lib/librte_vhost/vhost_user/vhost-net-user.h | 4 +
lib/librte_vhost/vhost_user/virtio-net-user.c | 86 ++++++++++---
lib/librte_vhost/vhost_user/virtio-net-user.h | 10 ++
lib/librte_vhost/virtio-net.c | 168 ++++++++++++++++----------
9 files changed, 275 insertions(+), 104 deletions(-)
--
1.9.0
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