From: Markus Armbruster <armbru@redhat.com>
To: Laurent Vivier <lvivier@redhat.com>
Cc: qemu-devel@nongnu.org,
"Marc-André Lureau" <marcandre.lureau@redhat.com>,
"Eric Blake" <eblake@redhat.com>,
"Jason Wang" <jasowang@redhat.com>,
"Paolo Bonzini" <pbonzini@redhat.com>,
"Laine Stump" <laine@redhat.com>,
"Stefano Brivio" <sbrivio@redhat.com>,
"Michael S. Tsirkin" <mst@redhat.com>
Subject: Re: [PATCH] net: vhost-user: add QAPI events to report connection state
Date: Fri, 14 Feb 2025 11:06:01 +0100 [thread overview]
Message-ID: <871pw07sdy.fsf@pond.sub.org> (raw)
In-Reply-To: <20250214072629.1033314-1-lvivier@redhat.com> (Laurent Vivier's message of "Fri, 14 Feb 2025 08:26:25 +0100")
Laurent Vivier <lvivier@redhat.com> writes:
> 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 <lvivier@redhat.com>
Standard question for events: if a management application misses an
event, say because it restarts and reconnects, is there a way to obtain
the missed information with a query command?
next prev parent reply other threads:[~2025-02-14 10:06 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-02-14 7:26 [PATCH] net: vhost-user: add QAPI events to report connection state Laurent Vivier
2025-02-14 8:53 ` Stefano Brivio
2025-02-14 10:06 ` Markus Armbruster [this message]
2025-02-14 10:18 ` Laurent Vivier
2025-02-14 13:54 ` Markus Armbruster
2025-02-14 14:13 ` Stefano Brivio
2025-02-14 13:59 ` Daniel P. Berrangé
2025-02-14 14:18 ` Stefano Brivio
2025-02-14 14:19 ` Daniel P. Berrangé
2025-02-14 14:28 ` Stefano Brivio
2025-02-14 14:31 ` Daniel P. Berrangé
2025-02-14 14:38 ` Stefano Brivio
2025-02-17 10:22 ` Laurent Vivier
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