qapi: net: add stream and dgram netdevs

Copied from socket netdev file and modified to use SocketAddress
to be able to introduce new features like unix socket.

"udp" and "mcast" are squashed into dgram netdev, multicast is detected
according to the IP address type.
"listen" and "connect" modes are managed by stream netdev. An optional
parameter "server" defines the mode (off by default)

The two new types need to be parsed the modern way with -netdev, because
with the traditional way, the "type" field of netdev structure collides with
the "type" field of SocketAddress and prevents the correct evaluation of the
command line option. Moreover the traditional way doesn't allow to use
the same type (SocketAddress) several times with the -netdev option
(needed to specify "local" and "remote" addresses).

The previous commit paved the way for parsing the modern way, but
omitted one detail: how to pick modern vs. traditional, in
netdev_is_modern().

We want to pick based on the value of parameter "type".  But how to
extract it from the option argument?

Parsing the option argument, either the modern or the traditional way,
extracts it for us, but only if parsing succeeds.

If parsing fails, there is no good option.  No matter which parser we
pick, it'll be the wrong one for some arguments, and the error
reporting will be confusing.

Fortunately, the traditional parser accepts *anything* when called in
a certain way.  This maximizes our chance to extract the value of
"type", and in turn minimizes the risk of confusing error reporting.

Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: Stefano Brivio <sbrivio@redhat.com>
Acked-by: Markus Armbruster <armbru@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>

1 files changed, 64 insertions, 2 deletions

diff --git a/qapi/net.json b/qapi/net.json
index 926ecc8cca..d476d33c72 100644
--- a/qapi/net.json
+++ b/qapi/net.json
@@ -7,6 +7,7 @@
 ##
 
 { 'include': 'common.json' }
+{ 'include': 'sockets.json' }
 
 ##
 # @set_link:
@@ -577,6 +578,60 @@
   'if': 'CONFIG_VMNET' }
 
 ##
+# @NetdevStreamOptions:
+#
+# Configuration info for stream socket netdev
+#
+# @addr: socket address to listen on (server=true)
+#        or connect to (server=false)
+# @server: create server socket (default: false)
+#
+# Only SocketAddress types 'inet' and 'fd' are supported.
+#
+# Since: 7.2
+##
+{ 'struct': 'NetdevStreamOptions',
+  'data': {
+    'addr':   'SocketAddress',
+    '*server': 'bool' } }
+
+##
+# @NetdevDgramOptions:
+#
+# Configuration info for datagram socket netdev.
+#
+# @remote: remote address
+# @local: local address
+#
+# Only SocketAddress types 'inet' and 'fd' are supported.
+#
+# If remote address is present and it's a multicast address, local address
+# is optional. Otherwise local address is required and remote address is
+# optional.
+#
+# .. table:: Valid parameters combination table
+#    :widths: auto
+#
+#    =============  ========  =====
+#    remote         local     okay?
+#    =============  ========  =====
+#    absent         absent    no
+#    absent         not fd    no
+#    absent         fd        yes
+#    multicast      absent    yes
+#    multicast      present   yes
+#    not multicast  absent    no
+#    not multicast  present   yes
+#    =============  ========  =====
+#
+# Since: 7.2
+##
+{ 'struct': 'NetdevDgramOptions',
+  'data': {
+    '*local':  'SocketAddress',
+    '*remote': 'SocketAddress' } }
+
+##
 # @NetClientDriver:
 #
 # Available netdev drivers.
@@ -587,10 +642,13 @@
 #        @vmnet-host since 7.1
 #        @vmnet-shared since 7.1
 #        @vmnet-bridged since 7.1
+#        @stream since 7.2
+#        @dgram since 7.2
 ##
 { 'enum': 'NetClientDriver',
-  'data': [ 'none', 'nic', 'user', 'tap', 'l2tpv3', 'socket', 'vde',
-            'bridge', 'hubport', 'netmap', 'vhost-user', 'vhost-vdpa',
+  'data': [ 'none', 'nic', 'user', 'tap', 'l2tpv3', 'socket', 'stream',
+            'dgram', 'vde', 'bridge', 'hubport', 'netmap', 'vhost-user',
+            'vhost-vdpa',
             { 'name': 'vmnet-host', 'if': 'CONFIG_VMNET' },
             { 'name': 'vmnet-shared', 'if': 'CONFIG_VMNET' },
             { 'name': 'vmnet-bridged', 'if': 'CONFIG_VMNET' }] }
@@ -610,6 +668,8 @@
 #        'vmnet-host' - since 7.1
 #        'vmnet-shared' - since 7.1
 #        'vmnet-bridged' - since 7.1
+#        'stream' since 7.2
+#        'dgram' since 7.2
 ##
 { 'union': 'Netdev',
   'base': { 'id': 'str', 'type': 'NetClientDriver' },
@@ -620,6 +680,8 @@
     'tap':      'NetdevTapOptions',
     'l2tpv3':   'NetdevL2TPv3Options',
     'socket':   'NetdevSocketOptions',
+    'stream':   'NetdevStreamOptions',
+    'dgram':    'NetdevDgramOptions',
     'vde':      'NetdevVdeOptions',
     'bridge':   'NetdevBridgeOptions',
     'hubport':  'NetdevHubPortOptions',