The virtio queue reset function has already been defined in the virtio spec 1.2.
The relevant virtio spec information is here:
https://github.com/oasis-tcs/virtio-spec/issues/124
https://github.com/oasis-tcs/virtio-spec/issues/139
This patch set is to support this function in QEMU. It consists of two parts:
virtio-net
and vhost-user. The patches 1-7 are the implementation for virtio-net and the
patches
8-16 are for vhost-user.
The process of virt queue reset can be concluded as:
1. The virtqueue is disabled when VIRTIO_PCI_COMMON_Q_RESET is written.
2. Then the virtqueue is restarted after the information of vrings is passed to
QEMU and
VIRTIO_PCI_COMMON_Q_ENABLE is written.
Test environment:
Host: 5.4.189
Qemu: QEMU emulator version 7.0.50
Guest: 5.19.0-rc3 (With vq reset support)
DPDK: 22.07-rc1 (With vq reset support)
Test Cmd: ethtool -g eth1; ethtool -G eth1 rx $1 tx $2; ethtool -g eth1;
The frontend can resize the virtio queue, then virtio queue reset function
should
be triggered.
The default is split mode, modify Qemu virtio-net to add PACKED feature to
test packed mode.
Guest Kernel Patch:
https://lore.kernel.org/bpf/20220629065656.54420-1-xuanz...@linux.alibaba.com/
DPDK Code:
https://github.com/middaywords/dpdk/commit/098c8e1dfae10b747da8dd8950a82890efca7bee
Please review. Thanks.
Kangjie Xu (9):
vhost: add op to enable or disable a single vring
vhost-user: enable/disable a single vring
vhost: extract the logic of unmapping the vrings and desc
vhost: introduce restart and release for vhost_dev's vqs
vhost-net: introduce restart and stop for vhost_net's vqs
virtio: introduce queue_enable in virtio
virtio-net: support queue_enable for vhost-user
virtio-net: support queue_reset for vhost-user
vhost-net: vq reset feature bit support
Xuan Zhuo (7):
virtio-pci: virtio_pci_common_cfg add queue_notify_data
virtio: add VIRTIO_F_RING_RESET
virtio: pci: virtio_pci_common_cfg add queue_reset
virtio: introduce __virtio_queue_reset()
virtio: introduce virtio_queue_reset()
virtio-pci: support queue reset
virtio-net: support queue reset
hw/net/vhost_net.c | 56 ++++++++++++++++++
hw/net/virtio-net.c | 40 +++++++++++++
hw/virtio/vhost-user.c | 55 +++++++++++++++---
hw/virtio/vhost.c | 49 ++++++++++++++--
hw/virtio/virtio-pci.c | 17 ++++++
hw/virtio/virtio.c | 57 +++++++++++++------
include/hw/virtio/vhost-backend.h | 4 ++
include/hw/virtio/vhost.h | 6 ++
include/hw/virtio/virtio-pci.h | 1 +
include/hw/virtio/virtio.h | 4 ++
include/net/vhost_net.h | 5 ++
.../standard-headers/linux/virtio_config.h | 5 ++
include/standard-headers/linux/virtio_pci.h | 4 ++
13 files changed, 274 insertions(+), 29 deletions(-)
--
2.32.0
