[dpdk-dev] [PATCH 00/14] implement packed virtqueues
Jens Freimann
jfreimann at redhat.com
Mon Jan 29 15:11:29 CET 2018
This is a basic implementation of packed virtqueues as specified in the
Virtio 1.1 draft. A compiled version of the current draft is available
at https://github.com/oasis-tcs/virtio-docs.git (or as .pdf at
https://github.com/oasis-tcs/virtio-docs/blob/master/virtio-v1.1-packed-wd07.pdf
It does not implement yet indirect descriptors and checksum offloading.
VIRTIO_F_IN_ORER is not implemented, as well as support for mergeable buffers
with packed queues. Patches for this will follow soon.
A packed virtqueue is different from a split virtqueue in that it
consists of only a single descriptor ring that replaces available and
used ring, index and descriptor buffer.
Each descriptor is readable and writable and has a flags field. These flags
will mark if a descriptor is available or used. To detect new available descriptors
even after the ring has wrapped, device and driver each have a
single-bit wrap counter that is flipped from 0 to 1 and vice versa every time
the last descriptor in the ring is used/made available.
The idea behind this is to 1. improve performance by avoiding cache misses
and 2. be easier for devices to implement.
Regarding performance: with these patches I get 21.13 Mpps on my system
as compared to 18.8 Mpps with the virtio 1.0 code. Packet size was 64
bytes, 0.05% acceptable loss. Test setup is described as in
http://dpdk.org/doc/guides/howto/pvp_reference_benchmark.html
Packet generator:
MoonGen
Intel(R) Xeon(R) CPU E5-2665 0 @ 2.40GHz
Intel X710 NIC
RHEL 7.4
Device under test:
Intel(R) Xeon(R) CPU E5-2667 v4 @ 3.20GHz
Intel X710 NIC
RHEL 7.4
VM on DuT: RHEL7.4
I plan to do more performance test with bigger frame sizes.
This patch series is based on a prototype implemented by Yuanhan Liu and
Tiwei Bie.
regards,
Jens Freimann (10):
net/virtio: vring init for packed queues
net/virtio: don't call virtio_disable_intr() for packed queues
net/virtio: add virtio 1.1 defines
net/virtio: add packed virtqueue helpers
net/virtio: don't dump split virtqueue data
net/virtio: implement transmit path for packed queues
vhost: add virtio 1.1 defines
vhost: add helpers for packed virtqueues
vhost: dequeue for packed queues
vhost: packed queue enqueue path
Yuanhan Liu (4):
net/virtio-user: add option to use packed queues
net/virtio: implement receive path for packed queues
vhost: vring address setup for packed queues
vhost: enable packed virtqueues
drivers/net/virtio/Makefile | 1 +
drivers/net/virtio/virtio_ethdev.c | 50 ++--
drivers/net/virtio/virtio_ethdev.h | 5 +
drivers/net/virtio/virtio_pci.h | 8 +
drivers/net/virtio/virtio_ring.h | 63 ++++-
drivers/net/virtio/virtio_rxtx.c | 141 +++++++++-
drivers/net/virtio/virtio_rxtx_1.1.c | 161 ++++++++++++
drivers/net/virtio/virtio_user/virtio_user_dev.c | 12 +-
drivers/net/virtio/virtio_user/virtio_user_dev.h | 3 +-
drivers/net/virtio/virtio_user_ethdev.c | 15 +-
drivers/net/virtio/virtqueue.c | 3 +
drivers/net/virtio/virtqueue.h | 14 +-
lib/librte_vhost/vhost.c | 5 +
lib/librte_vhost/vhost.h | 7 +-
lib/librte_vhost/vhost_user.c | 17 +-
lib/librte_vhost/virtio-1.1.h | 63 +++++
lib/librte_vhost/virtio_net.c | 321 ++++++++++++++++++++++-
17 files changed, 859 insertions(+), 30 deletions(-)
create mode 100644 drivers/net/virtio/virtio_rxtx_1.1.c
create mode 100644 lib/librte_vhost/virtio-1.1.h
--
2.14.3
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