[PATCH 0/5] Add vhost-user support to passt. (part 3)

[Laurent Vivier <lvivier@redhat.com>]

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

Laurent Vivier (5):
  packet: replace struct desc by struct iovec
  vhost-user: introduce virtio API
  vhost-user: introduce vhost-user API
  iov: add iov_count()
  vhost-user: add vhost-user

 Makefile       |    4 +-
 checksum.c     |    1 -
 conf.c         |   18 +-
 iov.c          |   35 +-
 iov.h          |    2 +
 packet.c       |   81 ++--
 packet.h       |   16 +-
 passt.c        |   14 +-
 passt.h        |   10 +
 pcap.c         |    1 -
 tap.c          |  106 ++++-
 tap.h          |    5 +-
 tcp.c          |   17 +-
 tcp_vu.c       |  547 ++++++++++++++++++++++++
 tcp_vu.h       |    9 +
 udp.c          |   54 ++-
 udp_internal.h |   39 ++
 udp_vu.c       |  237 +++++++++++
 udp_vu.h       |    8 +
 util.h         |   11 +
 vhost_user.c   | 1077 ++++++++++++++++++++++++++++++++++++++++++++++++
 vhost_user.h   |  137 ++++++
 virtio.c       |  442 ++++++++++++++++++++
 virtio.h       |  122 ++++++
 24 files changed, 2886 insertions(+), 107 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

-- 
2.45.2