[Qemu-devel] [PATCH 0/5] Add netmap backend offloadings support

[Vincenzo Maffione <v.maffione@gmail.com>]

The purpose of this patch series is to add offloadings support
(TSO/UFO/CSUM) to the netmap network backend, and make it possible
for the paravirtual network frontends (virtio-net and vmxnet3) to
use it.
In order to achieve this, these patches extend the existing
net.h interface to add abstract operations through which a network
frontend can manipulate backend offloading features, instead of
directly calling TAP-specific functions.

Guest-to-guest performance before this patches for virtio-net + netmap:

    TCP_STREAM                  5.0 Gbps
    TCP_RR                      12.7 Gbps
    UDP_STREAM (64-bytes)       790 Kpps

Guest-to-guest performance after this patches for virtio-net + netmap:

    TCP_STREAM                  21.4 Gbps
    TCP_RR                      12.7 Gbps
    UDP_STREAM (64-bytes)       790 Kpps

Experiment details:
    - Processor: Intel i7-3770K CPU @ 3.50GHz (8 cores)
    - Memory @ 1333 MHz
    - Host O.S.: Archlinux with Linux 3.11
    - Guest O.S.: Archlinux with Linux 3.11

    - QEMU command line:
        qemu-system-x86_64 archdisk.qcow -snapshot -enable-kvm -device virtio-net-pci,ioeventfd=on,mac=00:AA:BB:CC:DD:01,netdev=mynet -netdev netmap,ifname=vale0:01,id=mynet -smp 2 -vga std -m 3G


Vincenzo Maffione (5):
  net: extend NetClientInfo for offloading manipulations
  net: TAP uses NetClientInfo offloading callbacks
  net: virtio-net and vmxnet3 use offloading API
  net: add offloadings support to netmap backend
  net: virtio-net and vmxnet3 can use netmap offloadings

 hw/net/virtio-net.c | 16 +++++---------
 hw/net/vmxnet3.c    | 12 +++++-----
 include/net/net.h   | 19 ++++++++++++++++
 net/net.c           | 55 +++++++++++++++++++++++++++++++++++++++++++++
 net/netmap.c        | 64 ++++++++++++++++++++++++++++++++++++++++++++++++++++-
 net/tap.c           |  6 +++++
 6 files changed, 154 insertions(+), 18 deletions(-)

-- 
1.8.5.1