Re: [Xen-devel] [PATCH v3] sndif: add ABI for Para-virtual sound

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 22.01.15 at 11:52, <oleksandr.dmytryshyn@xxxxxxxxxxxxxxx> wrote:
> On Thu, Jan 22, 2015 at 12:24 PM, Jan Beulich <JBeulich@xxxxxxxx> wrote:
>>>>> On 22.01.15 at 10:56, <oleksandr.dmytryshyn@xxxxxxxxxxxxxxx> wrote:
>>> + * Responce for all requests exept the XENSND_GET_VOLUME:
>>> + *     0    1     2     3     4     5     6     7  octet
>>> + * +-----+-----+-----+-----+-----+-----+-----+-----+
>>> + * |       stream_id       |       operation       |
>>
>> Is there a really need for echoing the operation, i.e. isn't the echoed
>> ID sufficient? Because if you'd be able to drop this, request and
>> response sizes would match up, avoiding wasted space on the
>> shared page(s).
> In our implementation there is no matter if is echoed the operation or no.
> Frontend sends one request and waits a response. So I can simply remove
> the echoed operation. But in the future if this echoed the operation
> will be needed
> it can be simply restored.

Question here is whether "stream_id" really means what its name
says. If it does, you certainly need another field with a request ID,
which then also need echoing (and then the question is whether
stream_id need echoing too).

Jan


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