Re: [RFC PATCH v3 00/11] qapi: net: add unix socket type support to netdev backend

["Dr. David Alan Gilbert" <dgilbert@redhat.com>]

* Laurent Vivier (lvivier@redhat.com) wrote:
> "-netdev socket" only supports inet sockets.
> 
> It's not a complex task to add support for unix sockets, but
> the socket netdev parameters are not defined to manage well unix
> socket parameters.
> 
> As discussed in:
> 
>   "socket.c added support for unix domain socket datagram transport"
>   https://lore.kernel.org/qemu-devel/1C0E1BC5-904F-46B0-8044-68E43E67BE60@gmail.com/
> 
> This series adds support of unix socket type using SocketAddress QAPI structure.
> 
> Two new netdev backends, "stream" and "dgram" are added, that are barely a copy of "socket"
> backend but they use the SocketAddress QAPI to provide socket parameters.
> And then they also implement unix sockets (TCP and UDP).

Had you considered a -netdev chardev?

Dave

> Some examples of CLI syntax:
> 
>   for TCP:
> 
>   -netdev stream,id=socket0,addr.type=inet,addr.host=localhost,addr.port=1234
>   -netdev stream,id=socket0,server=off,addr.type=inet,addr.host=localhost,addr.port=1234
> 
>   -netdev dgram,id=socket0,\
>           local.type=inet,local.host=localhost,local.port=1234,\
>           remote.type=inet,remote.host=localhost,remote.port=1235
> 
>   for UNIX:
> 
>   -netdev stream,id=socket0,addr.type=unix,addr.path=/tmp/qemu0
>   -netdev stream,id=socket0,server=off,addr.type=unix,addr.path=/tmp/qemu0
> 
>   -netdev dgram,id=socket0,\
>           local.type=unix,local.path=/tmp/qemu0,\
>           remote.type=unix,remote.path=/tmp/qemu1
> 
>   for FD:
> 
>   -netdev stream,id=socket0,addr.type=fd,addr.str=4
>   -netdev stream,id=socket0,server=off,addr.type=fd,addr.str=5
> 
>   -netdev dgram,id=socket0,local.type=fd,addr.str=4
> 
> v3:
>   - remove support of "-net" for dgram and stream. They are only
>     supported with "-netdev" option.
>   - use &error_fatal directly in net_client_inits()
>   - update qemu-options.hx
>   - move to QIO for stream socket
> 
> v2:
>   - use "stream" and "dgram" rather than "socket-ng,mode=stream"
>     and ""socket-ng,mode=dgram"
>   - extract code to bypass qemu_opts_parse_noisily() to
>     a new patch
>   - do not ignore EINVAL (Stefano)
>   - fix "-net" option
> 
> CC: Ralph Schmieder <ralph.schmieder@gmail.com>
> CC: Stefano Brivio <sbrivio@redhat.com>
> CC: Daniel P. Berrangé <berrange@redhat.com>
> CC: Markus Armbruster <armbru@redhat.com>
> 
> Laurent Vivier (10):
>   net: introduce convert_host_port()
>   net: remove the @errp argument of net_client_inits()
>   qapi: net: introduce a way to bypass qemu_opts_parse_noisily()
>   qapi: net: add stream and dgram netdevs
>   net: stream: add unix socket
>   net: dgram: make dgram_dst generic
>   net: dgram: move mcast specific code from net_socket_fd_init_dgram()
>   net: dgram: add unix socket
>   qemu-sockets: introduce socket_uri()
>   net: stream: move to QIO
> 
> Stefano Brivio (1):
>   net: stream: Don't ignore EINVAL on netdev socket connection
> 
>  hmp-commands.hx        |   2 +-
>  include/net/net.h      |   3 +-
>  include/qemu/sockets.h |   4 +-
>  monitor/hmp-cmds.c     |  23 +-
>  net/clients.h          |   6 +
>  net/dgram.c            | 706 +++++++++++++++++++++++++++++++++++++++++
>  net/hub.c              |   2 +
>  net/meson.build        |   2 +
>  net/net.c              | 149 ++++++---
>  net/stream.c           | 371 ++++++++++++++++++++++
>  qapi/net.json          |  40 ++-
>  qemu-options.hx        |  12 +
>  softmmu/vl.c           |   5 +-
>  util/qemu-sockets.c    |  20 ++
>  14 files changed, 1277 insertions(+), 68 deletions(-)
>  create mode 100644 net/dgram.c
>  create mode 100644 net/stream.c
> 
> -- 
> 2.36.1
> 
-- 
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK