[PATCH v2 0/4] 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

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 (4):
  packet: replace struct desc by struct iovec
  vhost-user: introduce virtio API
  vhost-user: introduce vhost-user API
  vhost-user: add vhost-user

 Makefile       |    4 +-
 checksum.c     |    1 -
 conf.c         |   24 +-
 iov.c          |    1 -
 isolation.c    |   15 +-
 packet.c       |   97 ++--
 packet.h       |   16 +-
 passt.c        |   16 +-
 passt.h        |   10 +
 pcap.c         |    1 -
 tap.c          |  114 ++++-
 tap.h          |    5 +-
 tcp.c          |   17 +-
 tcp_vu.c       |  560 +++++++++++++++++++++
 tcp_vu.h       |   12 +
 udp.c          |   54 +-
 udp_internal.h |   39 ++
 udp_vu.c       |  240 +++++++++
 udp_vu.h       |   11 +
 util.h         |   11 +
 vhost_user.c   | 1273 ++++++++++++++++++++++++++++++++++++++++++++++++
 vhost_user.h   |  197 ++++++++
 virtio.c       |  605 +++++++++++++++++++++++
 virtio.h       |  190 ++++++++
 24 files changed, 3392 insertions(+), 121 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