This patch set is based on the patch set that supports VIRTIO_F_RING_RESET for vhost-kernel: https://lore.kernel.org/qemu-devel/cover.1662916759.git.kangjie...@linux.alibaba.com/
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 The process of virtqueue reset can be concluded as: 1. The virtqueue is disabled when VIRTIO_PCI_COMMON_Q_RESET is written. 2. Then the virtqueue can be optionally restarted(re-enabled). The detailed process is listed below: 1. VIRTIO_PCI_COMMON_Q_RESET is written [virtio-pci] -> virtio_queue_reset() [virtio] -> virtio_net_queue_reset() [virtio-net] -> vhost_net_virtqueue_reset() [vhost-net] -> vhost_virtqueue_stop() -> __virtio_queue_reset() 2. VIRTIO_PCI_COMMON_Q_ENABLE is written [virtio-pci] -> virtio_queue_enable() [virtio] -> virtio_net_queue_enable() [virtio-net] -> vhost_net_virtqueue_restart() [vhost-net] -> vhost_virtqueue_start() -> vhost_user_set_vring_enable [vhost-user] -> send VHOST_USER_SET_VRING_ENABLE to the device -> set enabled, reset status of vq. changelog: 1. Reuse the vhost_virtqueue_stop() when resetting a vq. Test environment: Qemu: QEMU emulator version 7.1.50 Guest: 5.19.0-rc3 (With vq reset support) DPDK: 22.11-rc0 (With vq reset support) Test Cmd: ethtool -g eth1; ethtool -G eth1 rx $1 tx $2; ethtool -g eth1; The drvier 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/20220801063902.129329-1-xuanz...@linux.alibaba.com/ DPDK Patch: https://github.com/middaywords/dpdk/compare/72206323a5dd3182b13f61b25a64abdddfee595c...080d9d5a6bba8ff8dce5186e2c6cb35cabef77c9 Kangjie Xu (6): net: virtio: rename vhost_set_vring_enable to vhost_set_dev_enable vhost-user: add op to enable or disable a single vring vhost-net: vhost-user: update vhost_net_virtqueue_reset() vhost-net: vhost-user: update vhost_net_virtqueue_restart() virtio-net: vhost-user: update queue_reset and queue_enable vhost: vhost-user: enable vq reset feature backends/cryptodev-vhost.c | 12 ++++++------ hw/net/vhost_net-stub.c | 2 +- hw/net/vhost_net.c | 15 +++++++++++---- hw/net/virtio-net.c | 10 ++++++---- hw/virtio/vhost-user.c | 27 +++++++++++++++++++-------- include/hw/virtio/vhost-backend.h | 5 ++++- include/net/vhost_net.h | 2 +- 7 files changed, 48 insertions(+), 25 deletions(-) -- 2.32.0