Re: [Qemu-devel] [PATCH v3 3/4] net/announce: Add optional ID

[Eric Blake <eblake@redhat.com>]

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On 6/10/19 1:44 PM, Dr. David Alan Gilbert (git) wrote:
> From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
> 
> Previously there was a single instance of the timer used by
> monitor triggered announces, that's OK, but when combined with the
> previous change that lets you have announces for subsets of interfaces
> it's a bit restrictive if you want to do different things to different
> interfaces.
> 
> Add an 'id' field to the announce, and maintain a list of the
> timers based on id.
> 
> This allows you to for example:
>     a) Start an announce going on interface eth0 for a long time
>     b) Start an announce going on interface eth1 for a long time
>     c) Kill the announce on eth0 while leaving eth1 going.
> 
> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
> ---

> +++ b/include/net/announce.h
> @@ -23,8 +23,12 @@ struct AnnounceTimer {
>  /* Returns: update the timer to the next time point */
>  int64_t qemu_announce_timer_step(AnnounceTimer *timer);
>  
> -/* Delete the underlying timer and other data */
> -void qemu_announce_timer_del(AnnounceTimer *timer);
> +/*
> + * Delete the underlying timer and other datas

'data' is already plural, 'datas' is not a word.

> + * If 'free_named' true and the timer is a named timer, then remove
> + * it from the list of named timers and free the AnnounceTimer itself.
> + */
> +void qemu_announce_timer_del(AnnounceTimer *timer, bool free_named);
>  

> +++ b/qapi/net.json
> @@ -702,6 +702,10 @@
>  # @interfaces: An optional list of interface names, which restrict the
>  #        announcment to the listed interfaces. (Since 4.1)
>  #
> +# @id: A name to be used to identify an instance of announce-timers
> +#        and to allow it to modified later.  Not for use as
> +#        part of the migration paramters. (Since 4.1)

parameters

> +#
>  # Since: 4.0
>  ##
>  
> @@ -710,7 +714,8 @@
>              'max': 'int',
>              'rounds': 'int',
>              'step': 'int',
> -            '*interfaces': ['str'] } }
> +            '*interfaces': ['str'],
> +            '*id' : 'str' } }
>  
>  ##
>  # @announce-self:
> @@ -725,7 +730,7 @@
>  # -> { "execute": "announce-self",
>  #      "arguments": {
>  #          "initial": 50, "max": 550, "rounds": 10, "step": 50,
> -#          "interfaces": ["vn2","vn3"] } }
> +#          "interfaces": ["vn2","vn3"], "id": "bob" } }
>  # <- { "return": {} }
>  #

Worth an example of deleting a timer by id?

>  # Since: 4.0
> diff --git a/tests/virtio-net-test.c b/tests/virtio-net-test.c
> index 163126cf07..7184e2bff4 100644
> --- a/tests/virtio-net-test.c
> +++ b/tests/virtio-net-test.c
> @@ -186,7 +186,7 @@ static void announce_self(void *obj, void *data, QGuestAllocator *t_alloc)
>      rsp = qmp("{ 'execute' : 'announce-self', "
>                    " 'arguments': {"
>                        " 'initial': 50, 'max': 550,"
> -                      " 'rounds': 10, 'step': 50 } }");
> +                      " 'rounds': 10, 'step': 50, 'id': 'bob' } }");

And here, is it worth testing that you can delete by id, rather than
just create with an id?

>      assert(!qdict_haskey(rsp, "error"));
>      qobject_unref(rsp);
>  
> 

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3226
Virtualization:  qemu.org | libvirt.org


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