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net: vhost-user: add QAPI events to report connection state

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The netdev reports NETDEV_VHOST_USER_CONNECTED event when
the chardev is connected, and NETDEV_VHOST_USER_DISCONNECTED
when it is disconnected.

The NETDEV_VHOST_USER_CONNECTED event includes the chardev id.

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

For instance with passt:

{ 'execute': 'qmp_capabilities' }
{ "return": { } }

[killing passt here]

{ "timestamp": { "seconds": 1739538634, "microseconds": 920450 },
  "event": "NETDEV_VHOST_USER_DISCONNECTED",
  "data": { "netdev-id": "netdev0" } }

[automatic reconnection with reconnect-ms]

{ "timestamp": { "seconds": 1739538638, "microseconds": 354181 },
  "event": "NETDEV_VHOST_USER_CONNECTED",
  "data": { "netdev-id": "netdev0", "chardev-id": "chr0" } }

Tested-by: Stefano Brivio <sbrivio@redhat.com>
Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Message-Id: <20250217092550.1172055-1-lvivier@redhat.com>
Acked-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Laurent Vivier 2025-02-17 10:25:50 +01:00 • committed by Michael S. Tsirkin
parent 131fe64e63
commit 02fd9f8aee
2 changed files with 43 additions and 0 deletions
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3
net/vhost-user.c
View file

@ -16,6 +16,7 @@
#include "chardev/char-fe.h"
#include "qapi/error.h"
#include "qapi/qapi-commands-net.h"
#include "qapi/qapi-events-net.h"
#include "qemu/config-file.h"
#include "qemu/error-report.h"
#include "qemu/option.h"
@ -271,6 +272,7 @@ static void chr_closed_bh(void *opaque)
if (err) {
error_report_err(err);
}
qapi_event_send_netdev_vhost_user_disconnected(name);
}
static void net_vhost_user_event(void *opaque, QEMUChrEvent event)
@ -300,6 +302,7 @@ static void net_vhost_user_event(void *opaque, QEMUChrEvent event)
net_vhost_user_watch, s);
qmp_set_link(name, true, &err);
s->started = true;
qapi_event_send_netdev_vhost_user_connected(name, chr->label);
break;
case CHR_EVENT_CLOSED:
/* a close event may happen during a read/write, but vhost

40
qapi/net.json
View file

@ -1031,3 +1031,43 @@
##
{ 'event': 'NETDEV_STREAM_DISCONNECTED',
'data': { 'netdev-id': 'str' } }
##
# @NETDEV_VHOST_USER_CONNECTED:
#
# Emitted when the vhost-user chardev is connected
#
# @netdev-id: QEMU netdev id that is connected
#
# @chardev-id: The character device id used by the QEMU netdev
#
# Since: 10.0
#
# .. qmp-example::
#
# <- { "timestamp": {"seconds": 1739538638, "microseconds": 354181 },
# "event": "NETDEV_VHOST_USER_CONNECTED",
# "data": { "netdev-id": "netdev0", "chardev-id": "chr0" } }
#
##
{ 'event': 'NETDEV_VHOST_USER_CONNECTED',
'data': { 'netdev-id': 'str', 'chardev-id': 'str' } }
##
# @NETDEV_VHOST_USER_DISCONNECTED:
#
# Emitted when the vhost-user chardev is disconnected
#
# @netdev-id: QEMU netdev id that is disconnected
#
# Since: 10.0
#
# .. qmp-example::
#
# <- { "timestamp": { "seconds": 1739538634, "microseconds": 920450 },
# "event": "NETDEV_VHOST_USER_DISCONNECTED",
# "data": { "netdev-id": "netdev0" } }
#
##
{ 'event': 'NETDEV_VHOST_USER_DISCONNECTED',
'data': { 'netdev-id': 'str' } }