This series introduces support for passt as a new network backend for
QEMU.
passt is a modern, unprivileged, user-mode networking solution that
provides guest connectivity by launching an external helper process. This
series adds the core backend and integrates it with vhost-user for
high-performance, accelerated networking.
The series is structured to first improve the general networking code
before adding the new feature. The first patch extracts from the stream
backend the functions that will be reused in the passt backend. The
following patches are a preparatory refactoring to decouple the generic
vhost layer from specific backend implementations (tap, vhost-user, etc.).
This is achieved by replacing hardcoded type checks with a callback-based
system in NetClientInfo, making the vhost infrastructure more modular and
extensible.
With the refactoring in place, subsequent patches introduce the passt
backend itself, reusing the generic stream handling logic. The final
patch adds vhost-user support to passt, which plugs cleanly into the
newly refactored vhost layer.
Some benchmarks:
Reference '-net user':
-net user,hostfwd=tcp::10001-:10001
iperf3 -c localhost -p 10001 -t 60 -4
[ ID] Interval Transfer Bitrate Retr
[ 5] 0.00-60.00 sec 14.2 GBytes 2.03 Gbits/sec 1 sender
[ 5] 0.00-60.00 sec 14.2 GBytes 2.03 Gbits/sec
receiver
New backend '-netdev passt'
-netdev passt,vhost-user=off,tcp-ports=10001
iperf3 -c localhost -p 10001 -t 60 -4
[ ID] Interval Transfer Bitrate Retr
[ 5] 0.00-60.00 sec 27.1 GBytes 3.88 Gbits/sec 0 sender
[ 5] 0.00-60.03 sec 27.1 GBytes 3.88 Gbits/sec
receiver
-netdev passt,vhost-user=on,tcp-ports=10001
iperf3 -c localhost -p 10001 -t 60 -4
[ ID] Interval Transfer Bitrate Retr
[ 5] 0.00-60.00 sec 224 GBytes 32.1 Gbits/sec 4 sender
[ 5] 0.00-60.05 sec 224 GBytes 32.0 Gbits/sec
receiver
v2:
- rebase:
fix conflict with
837b87c4c5ba ("net/stream: skip automatic zero-init of large array")
(why is this needed? A buffer on a stack is normally not initialized...)
- add path parameter to provide path of passt if it is not in PATH
- add 2 patches:
"net: Allow network backends to advertise max TX queue size"
"net: Consolidate vhost feature bits into NetClientInfo"
Thanks,
Laurent
Laurent Vivier (10):
net: Refactor stream logic for reuse in '-net passt'
net: Define net_client_set_link()
net: Introduce helper to identify vhost-user clients
net: Add get_vhost_net callback to NetClientInfo
net: Consolidate vhost feature bits into NetClientInfo
net: Add get_acked_features callback to NetClientInfo
net: Add save_acked_features callback to NetClientInfo
net: Allow network backends to advertise max TX queue size
net: Add passt network backend
net/passt: Implement vhost-user backend support
hmp-commands.hx | 3 +
hw/net/vhost_net-stub.c | 1 -
hw/net/vhost_net.c | 139 +------
hw/net/virtio-net.c | 18 +-
include/net/net.h | 14 +
include/net/tap.h | 3 -
include/net/vhost-user.h | 19 -
include/net/vhost-vdpa.h | 4 -
meson.build | 6 +
meson_options.txt | 2 +
net/clients.h | 4 +
net/hub.c | 3 +
net/meson.build | 6 +-
net/net.c | 55 ++-
net/passt.c | 768 +++++++++++++++++++++++++++++++++++++++
net/stream.c | 282 ++++----------
net/stream_data.c | 193 ++++++++++
net/stream_data.h | 31 ++
net/tap-win32.c | 5 -
net/tap.c | 39 +-
net/vhost-user-stub.c | 1 -
net/vhost-user.c | 66 +++-
net/vhost-vdpa.c | 10 +-
qapi/net.json | 124 +++++++
qemu-options.hx | 18 +
25 files changed, 1399 insertions(+), 415 deletions(-)
delete mode 100644 include/net/vhost-user.h
create mode 100644 net/passt.c
create mode 100644 net/stream_data.c
create mode 100644 net/stream_data.h
--
2.49.0
