Hello all:
This seires is an update of last version of multiqueue support to add multiqueue
capability to both tap and virtio-net.
Some kinds of tap backends has (macvatp in linux) or would (tap) support
multiqueue. In such kind of tap backend, each file descriptor of a tap is a
qeueu and ioctls were prodived to attach an exist tap file descriptor to the
tun/tap device. So the patch let qemu to use this kind of backend, and let it
can transmit and receving packets through multiple file descriptors.
Patch 1 introduce a new help to get all matched options, after this patch, we
could pass multiple file descriptors to a signle netdev by:
qemu -netdev tap,id=h0,queues=2,fd=10,fd=11 ...
Patch 2 introduce generic helpers in tap to attach or detach a file descriptor
from a tap device, emulated nics could use this helper to enable/disable queues.
Patch 3 modifies the NICState to allow multiple VLANClientState to be stored in
it, with this patch, qemu has basic support of multiple capable tap backend.
Patch 4 implement 1:1 mapping of tx/rx virtqueue pairs with vhost_net backend.
Patch 5 converts virtio-net to multiqueue device, after this patch, multiqueue
virtio-net device could be specified by:
qemu -netdev tap,id=h0,queues=2 -device virtio-net-pci,netdev=h0,queues=2
Performace numbers:
I post them in the threads of RFC of multiqueue virtio-net driver:
http://www.spinics.net/lists/kvm/msg75386.html
Multiqueue with vhost shows improvemnt in TCP_RR, and degradate for small packet
transmission.
Changes from V2:
- split vhost patch from virtio-net
- add the support of queue number negotiation through control virtqueue
- hotplug, set_link and migration support
- bug fixes
Changes from V1:
- rebase to the latest
- fix memory leak in parse_netdev
- fix guest notifiers assignment/de-assignment
- changes the command lines to:
qemu -netdev tap,queues=2 -device virtio-net-pci,queues=2
References:
- V2 http://www.spinics.net/lists/kvm/msg74588.html
- V1 http://comments.gmane.org/gmane.comp.emulators.qemu/100481
Jason Wang (5):
option: introduce qemu_get_opt_all()
tap: multiqueue support
net: multiqueue support
vhost: multiqueue support
virtio-net: add multiqueue support
hw/dp8393x.c | 2 +-
hw/mcf_fec.c | 2 +-
hw/qdev-properties.c | 34 +++-
hw/qdev.h | 3 +-
hw/vhost.c | 53 ++++--
hw/vhost.h | 2 +
hw/vhost_net.c | 7 +-
hw/vhost_net.h | 2 +-
hw/virtio-net.c | 505 ++++++++++++++++++++++++++++++++++----------------
hw/virtio-net.h | 12 ++
net.c | 83 +++++++--
net.h | 16 ++-
net/tap-aix.c | 13 ++-
net/tap-bsd.c | 13 ++-
net/tap-haiku.c | 13 ++-
net/tap-linux.c | 56 ++++++-
net/tap-linux.h | 4 +
net/tap-solaris.c | 13 ++-
net/tap-win32.c | 11 +
net/tap.c | 199 +++++++++++++-------
net/tap.h | 7 +-
qemu-option.c | 19 ++
qemu-option.h | 2 +
23 files changed, 787 insertions(+), 284 deletions(-)
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