This series of patches adds vhost-user support to passt
and then allows passt to connect to QEMU network backend using
virtqueue rather than a socket.
With QEMU, rather than using to connect:
-netdev stream,id=s,server=off,addr.type=unix,addr.path=/tmp/passt_1.socket
we will use:
-chardev socket,id=chr0,path=/tmp/passt_1.socket
-netdev vhost-user,id=netdev0,chardev=chr0
-device virtio-net,netdev=netdev0
-object memory-backend-memfd,id=memfd0,share=on,size=$RAMSIZE
-numa node,memdev=memfd0
The memory backend is needed to share data between passt and QEMU.
Performance comparison between "-netdev stream" and "-netdev
vhost-user":
$ iperf3 -c localhost -p 10001 -t 60 -6 -u -b 50G
socket:
[ 5] 0.00-60.05 sec 95.6 GBytes 13.7 Gbits/sec 0.017 ms 6998988/10132413 (69%)
receiver
vhost-user:
[ 5] 0.00-60.04 sec 237 GBytes 33.9 Gbits/sec 0.006 ms 53673/7813770 (0.69%)
receiver
$ iperf3 -c localhost -p 10001 -t 60 -4 -u -b 50G
socket:
[ 5] 0.00-60.05 sec 98.9 GBytes 14.1 Gbits/sec 0.018 ms 6260735/9501832 (66%)
receiver
vhost-user:
[ 5] 0.00-60.05 sec 235 GBytes 33.7 Gbits/sec 0.008 ms 37581/7752699 (0.48%)
receiver
$ iperf3 -c localhost -p 10001 -t 60 -6
socket:
[ 5] 0.00-60.00 sec 17.3 GBytes 2.48 Gbits/sec 0 sender
[ 5] 0.00-60.06 sec 17.3 GBytes 2.48 Gbits/sec receiver
vhost-user:
[ 5] 0.00-60.00 sec 191 GBytes 27.4 Gbits/sec 0 sender
[ 5] 0.00-60.05 sec 191 GBytes 27.3 Gbits/sec receiver
$ iperf3 -c localhost -p 10001 -t 60 -4
socket:
[ 5] 0.00-60.00 sec 15.6 GBytes 2.24 Gbits/sec 0 sender
[ 5] 0.00-60.06 sec 15.6 GBytes 2.24 Gbits/sec receiver
vhost-user:
[ 5] 0.00-60.00 sec 189 GBytes 27.1 Gbits/sec 0 sender
[ 5] 0.00-60.04 sec 189 GBytes 27.0 Gbits/sec receiver
v5:
- rebase on top of 2024_09_06.6b38f07
- rework udp_vu.c as ref.udp.v6 has been removed and we need to
know if we receive IPv4 or IPv6 frame when we prepare the
guest buffers for recvmsg()
- remove vnet->hdrlen as the size is always the same with virtio-net v1
- address comments from David and Stefano
v6:
- rebase
- extract 3 patches from "vhost-user: add vhost-user":
passt: rename tap_sock_init() to tap_backend_init()
tcp: Export headers functions
udp: Prepare udp.c to be shared with vhost-user
- introduce new functions vu_collect_one_frame(),
vu_collect(), vu_set_vnethdr(), vu_flush(), vu_send_single()
to be called from tcp_vu.c, udp_vu.c and ICMP/DHCP where vhost-user
code was duplicated.
v4:
- rebase on top of 2024_08_21.1d6142f
(rebasing on top of 620e19a1b48a ("udp: Merge udp[46]_mh_recv arrays")
introduces a regression in the measure of the latency with UDP
because I think I don't replace correctly ref.udp.v6 that is removed
by this commit)
- Addressed most of the comments from David and Stefano
(I didn't want to postpone this version to next week,
so I'll address the remaining comments in the next version).
v3:
- rebase on top of flow table
- update tcp_vu.c to look like udp_vu.c (recv()/prepare()/send_frame())
- address comments from Stefano and David on version 2
v2:
- remove PATCH 4
- rewrite PATCH 2 and 3 to follow passt coding style
- move some code from PATCH 3 to PATCH 4 (previously PATCH 5)
- partially addressed David's comment on PATCH 5
Laurent Vivier (7):
packet: replace struct desc by struct iovec
vhost-user: introduce virtio API
vhost-user: introduce vhost-user API
udp: Prepare udp.c to be shared with vhost-user
tcp: Export headers functions
passt: rename tap_sock_init() to tap_backend_init()
vhost-user: add vhost-user
Makefile | 6 +-
conf.c | 22 +-
epoll_type.h | 4 +
iov.c | 1 -
isolation.c | 15 +-
packet.c | 91 +++--
packet.h | 22 +-
passt.1 | 10 +-
passt.c | 11 +-
passt.h | 6 +
pcap.c | 1 -
tap.c | 128 ++++--
tap.h | 7 +-
tcp.c | 37 +-
tcp_internal.h | 15 +
tcp_vu.c | 476 +++++++++++++++++++++++
tcp_vu.h | 12 +
udp.c | 84 ++--
udp_internal.h | 34 ++
udp_vu.c | 332 ++++++++++++++++
udp_vu.h | 13 +
util.h | 8 +
vhost_user.c | 1005 ++++++++++++++++++++++++++++++++++++++++++++++++
vhost_user.h | 206 ++++++++++
virtio.c | 660 +++++++++++++++++++++++++++++++
virtio.h | 184 +++++++++
vu_common.c | 327 ++++++++++++++++
vu_common.h | 47 +++
28 files changed, 3626 insertions(+), 138 deletions(-)
create mode 100644 tcp_vu.c
create mode 100644 tcp_vu.h
create mode 100644 udp_internal.h
create mode 100644 udp_vu.c
create mode 100644 udp_vu.h
create mode 100644 vhost_user.c
create mode 100644 vhost_user.h
create mode 100644 virtio.c
create mode 100644 virtio.h
create mode 100644 vu_common.c
create mode 100644 vu_common.h
--
2.46.2