[dpdk-dev] [PATCH v3 0/4] add support for virtio-user server mode

zhiyong.yang at intel.com zhiyong.yang at intel.com
Wed Mar 21 04:03:39 CET 2018


In a container environment if the vhost-user backend restarts, there's no way
for it to reconnect to virtio-user currently. To address this, support for
server mode is added. In this mode the socket file is created by virtio-user,
which the backend then connects to. This means that if the backend restarts,
it can reconnect to virtio-user and continue communications.

The series add support for the feature and target for 18.05 release.

Virtio-user with server mode creates socket file and then starts to wait for the
first connection from vhost user with client mode in blocking mode.

Virtio-user with server mode supports many times' vhost reconnections with the
same configurations. 

Virtio-user supports only one connection at the same time in server/client mode.

How to test?
The following scripts are as reference.

./x86_64-native-linuxapp-gcc/app/testpmd -c 0x3 -n 4 -m 256,0 --no-pci \
--file-prefix=testpmd0 --vdev=net_virtio_user0,mac=00:11:22:33:44:10, \
path=/tmp/sock0,server=1,queues=1 -- -i --rxq=1 --txq=1 --no-numa

./x86_64-native-linuxapp-gcc/app/testpmd -c 0x3e000 -n 4 --socket-mem 256,0 \
--vdev 'net_vhost0,iface=/tmp/sock0,client=1,queues=1' -- -i --rxq=1 --txq=1 \
--nb-cores=1 --no-numa

step1 : at the virtio-user side, run "start"
step2: at the vhost-user side run "start tx_first 40000"

Then you can get the numbers by running "show port stats all" at both sides.

Changes in V3:
1. use EAL epoll mechanism instead of vhost events. Cancel to export vhost
event APIs.
2. rebase the code on top of dpdk-next-virtio

Changes in V2:
1. split two patches 1/5 and 2/5 from v1 patchset to fix some existing issues
which is not strongly related to support for server mode according to Maxime's
comments.
2. move fdset related functions to librte_eal from librte_vhost exposed as
new APIs according to Thomas' comments.
3. release note is added in the patch 5/5.
4. squash data structure change patch into 4/5 according to Maxime's suggestion.

Zhiyong Yang (4):
  net/virtio: fix add pointer checking
  net/virtio: add checking for cvq
  net/virtio-user: add support for server mode
  net/vhost: add NULL pointer checking

 doc/guides/rel_notes/release_18_05.rst           |  7 ++
 drivers/net/vhost/rte_eth_vhost.c                |  9 +++
 drivers/net/virtio/virtio_ethdev.c               |  9 ++-
 drivers/net/virtio/virtio_user/vhost_user.c      | 96 ++++++++++++++++++++++--
 drivers/net/virtio/virtio_user/virtio_user_dev.c | 47 ++++++++----
 drivers/net/virtio/virtio_user/virtio_user_dev.h | 11 +++
 drivers/net/virtio/virtio_user_ethdev.c          | 83 +++++++++++++++++++-
 7 files changed, 238 insertions(+), 24 deletions(-)

-- 
2.14.3



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