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net: stream: add QAPI events to report connection state 

The netdev reports NETDEV_STREAM_CONNECTED event when the backend
is connected, and NETDEV_STREAM_DISCONNECTED when it is disconnected.

The NETDEV_STREAM_CONNECTED event includes the destination address.

This allows a system manager like libvirt to detect when the server
fails.

For instance with passt:

{ 'execute': 'qmp_capabilities' }
{ "return": { } }
{ "timestamp": { "seconds": 1666341395, "microseconds": 505347 },
    "event": "NETDEV_STREAM_CONNECTED",
    "data": { "netdev-id": "netdev0",
        "addr": { "path": "/tmp/passt_1.socket", "type": "unix" } } }

[killing passt here]

{ "timestamp": { "seconds": 1666341430, "microseconds": 968694 },
    "event": "NETDEV_STREAM_DISCONNECTED",
    "data": { "netdev-id": "netdev0" } }

Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
master
Laurent Vivier 2022-10-21 11:09:22 +02:00 committed by Jason Wang
parent 1f9c890fa3
commit e506fee8b1
2 changed files with 54 additions and 0 deletions
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5
net/stream.c
View File

@ -38,6 +38,7 @@
#include "io/channel.h"
#include "io/channel-socket.h"
#include "io/net-listener.h"
#include "qapi/qapi-events-net.h"
typedef struct NetStreamState {
NetClientState nc;
@ -168,6 +169,8 @@ static gboolean net_stream_send(QIOChannel *ioc,
s->nc.link_down = true;
qemu_set_info_str(&s->nc, "");
qapi_event_send_netdev_stream_disconnected(s->nc.name);
return G_SOURCE_REMOVE;
}
buf = buf1;
@ -244,6 +247,7 @@ static void net_stream_listen(QIONetListener *listener,
uri = socket_uri(addr);
qemu_set_info_str(&s->nc, uri);
g_free(uri);
qapi_event_send_netdev_stream_connected(s->nc.name, addr);
qapi_free_SocketAddress(addr);
}
@ -335,6 +339,7 @@ static void net_stream_client_connected(QIOTask *task, gpointer opaque)
s->ioc_read_tag = qio_channel_add_watch(s->ioc, G_IO_IN, net_stream_send,
s, NULL);
s->nc.link_down = false;
qapi_event_send_netdev_stream_connected(s->nc.name, addr);
qapi_free_SocketAddress(addr);
return;

49
qapi/net.json
View File

@ -898,3 +898,52 @@
##
{ 'event': 'FAILOVER_NEGOTIATED',
'data': {'device-id': 'str'} }
##
# @NETDEV_STREAM_CONNECTED:
#
# Emitted when the netdev stream backend is connected
#
# @netdev-id: QEMU netdev id that is connected
# @addr: The destination address
#
# Since: 7.2
#
# Example:
#
# <- { "event": "NETDEV_STREAM_CONNECTED",
# "data": { "netdev-id": "netdev0",
# "addr": { "port": "47666", "ipv6": true,
# "host": "::1", "type": "inet" } },
# "timestamp": { "seconds": 1666269863, "microseconds": 311222 } }
#
# or
#
# <- { "event": "NETDEV_STREAM_CONNECTED",
# "data": { "netdev-id": "netdev0",
# "addr": { "path": "/tmp/qemu0", "type": "unix" } },
# "timestamp": { "seconds": 1666269706, "microseconds": 413651 } }
#
##
{ 'event': 'NETDEV_STREAM_CONNECTED',
'data': { 'netdev-id': 'str',
'addr': 'SocketAddress' } }
##
# @NETDEV_STREAM_DISCONNECTED:
#
# Emitted when the netdev stream backend is disconnected
#
# @netdev-id: QEMU netdev id that is disconnected
#
# Since: 7.2
#
# Example:
#
# <- { 'event': 'NETDEV_STREAM_DISCONNECTED',
# 'data': {'netdev-id': 'netdev0'},
# 'timestamp': {'seconds': 1663330937, 'microseconds': 526695} }
#
##
{ 'event': 'NETDEV_STREAM_DISCONNECTED',
'data': { 'netdev-id': 'str' } }