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 ChardevInfo
(label, filename and frontend_open).
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": 1739517243, "microseconds": 115081 },
"event": "NETDEV_VHOST_USER_DISCONNECTED",
"data": { "netdev-id": "netdev0" } }
[automatic reconnection with reconnect-ms]
{ "timestamp": { "seconds": 1739517290, "microseconds": 343777 },
"event": "NETDEV_VHOST_USER_CONNECTED",
"data": { "netdev-id": "netdev0",
"info": { "frontend-open": true,
"filename": "unix:",
"label": "chr0" } } }
Signed-off-by: Laurent Vivier <lviv...@redhat.com>
---
qapi/char.json | 43 +++++++++++++++++++++++++++++++++++++++++++
net/vhost-user.c | 8 ++++++++
2 files changed, 51 insertions(+)
diff --git a/qapi/char.json b/qapi/char.json
index f02b66c06b3e..a8094c86fb49 100644
--- a/qapi/char.json
+++ b/qapi/char.json
@@ -902,3 +902,46 @@
{ 'event': 'VSERPORT_CHANGE',
'data': { 'id': 'str',
'open': 'bool' } }
+
+##
+# @NETDEV_VHOST_USER_CONNECTED:
+#
+# Emitted when the vhost-user chardev is connected
+#
+# @netdev-id: QEMU netdev id that is connected
+#
+# @info: The chardev information
+#
+# Since: 10.0
+#
+# .. qmp-example::
+#
+# <- { "timestamp": { "seconds": 1739469793, "microseconds": 683713 },
+# "event": "NETDEV_VHOST_USER_CONNECTED",
+# "data": { "netdev-id": "netdev0",
+# "info": { "frontend-open": true,
+# "filename": "unix:",
+# "label": "chr0" } } }
+#
+##
+{ 'event': 'NETDEV_VHOST_USER_CONNECTED',
+ 'data': { 'netdev-id': 'str', 'info': 'ChardevInfo' } }
+
+##
+# @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": 1739469786, "microseconds": 822220 },
+# "event": "NETDEV_VHOST_USER_DISCONNECTED",
+# "data": { "netdev-id": "netdev0" } }
+#
+##
+{ 'event': 'NETDEV_VHOST_USER_DISCONNECTED',
+ 'data': { 'netdev-id': 'str' } }
diff --git a/net/vhost-user.c b/net/vhost-user.c
index 12555518e838..841b94e785a4 100644
--- a/net/vhost-user.c
+++ b/net/vhost-user.c
@@ -16,6 +16,7 @@
#include "chardev/char-fe.h"
#include "qapi/error.h"
#include "qapi/qapi-commands-net.h"
+#include "qapi/qapi-events-char.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)
@@ -278,6 +280,7 @@ static void net_vhost_user_event(void *opaque, QEMUChrEvent
event)
const char *name = opaque;
NetClientState *ncs[MAX_QUEUE_NUM];
NetVhostUserState *s;
+ ChardevInfo info;
Chardev *chr;
Error *err = NULL;
int queues;
@@ -300,6 +303,11 @@ static void net_vhost_user_event(void *opaque,
QEMUChrEvent event)
net_vhost_user_watch, s);
qmp_set_link(name, true, &err);
s->started = true;
+ info.label = chr->label;
+ info.filename = chr->filename;
+ info.frontend_open = chr->filename;
+ info.frontend_open = chr->be && chr->be->fe_is_open;
+ qapi_event_send_netdev_vhost_user_connected(name, &info);
break;
case CHR_EVENT_CLOSED:
/* a close event may happen during a read/write, but vhost
--
2.48.1
