Hi All: This patch implements the multiqueue support for vhost-vDPA. The most important requirement si the control virtqueue support. The virtio-net and vhost-net core are tweak to support control virtqueue as if what data queue pairs are done: a dedicated vhost_net device which is coupled with the NetClientState is intrdouced so most of the existing vhost codes could be reused with minor changes. This means the control virtqueue will bypass the Qemu. With the control virtqueue, vhost-vDPA are extend to support creating and destroying multiqueue queue pairs plus the control virtqueue.
For the future, if we want to support live migration, we can either do shadow cvq on top or introduce new interfaces for reporting device states. Tests are done via the vp_vdpa driver in L1 guest. Changes since V4: - rebase on top of Michael's pci branch Changes since V3: - fix build with vhost disabled Changes since V2: - rebase to qemu master - use "queue_pairs" instead of "qps" - typo fixes Changes since V1: - start and stop vhost devices when all queues were setup - fix the case when driver doesn't support MQ but device support - correctly set the batching capability to avoid a map/unmap storm - various other tweaks Jason Wang (10): vhost-vdpa: open device fd in net_init_vhost_vdpa() vhost-vdpa: classify one time request vhost-vdpa: prepare for the multiqueue support vhost-vdpa: let net_vhost_vdpa_init() returns NetClientState * net: introduce control client vhost-net: control virtqueue support virtio-net: use "queue_pairs" instead of "queues" when possible vhost: record the last virtqueue index for the virtio device virtio-net: vhost control virtqueue support vhost-vdpa: multiqueue support hw/net/vhost_net-stub.c | 4 +- hw/net/vhost_net.c | 55 ++++++++--- hw/net/virtio-net.c | 165 ++++++++++++++++++--------------- hw/virtio/vhost-vdpa.c | 57 ++++++++++-- include/hw/virtio/vhost-vdpa.h | 1 + include/hw/virtio/vhost.h | 2 + include/hw/virtio/virtio-net.h | 5 +- include/net/net.h | 5 + include/net/vhost_net.h | 6 +- net/net.c | 24 ++++- net/vhost-vdpa.c | 127 ++++++++++++++++++++++--- 11 files changed, 331 insertions(+), 120 deletions(-) -- 2.25.1
