[alsa-devel] [Xen-devel] [PATCH v3 0/5] sndif: add explicit back and front synchronization

[Oleksandr Andrushchenko]

On 04/06/2018 12:13 PM, Juergen Gross wrote:
> On 19/03/18 08:22, Oleksandr Andrushchenko wrote:
>> From: Oleksandr Andrushchenko <oleksandr_andrushchenko at epam.com>
>>
>> Hello, all!
>>
>> In order to provide explicit synchronization between backend and
>> frontend the following changes are introduced in the protocol:
>>   - bump protocol version to 2
>>   - add new ring buffer for sending asynchronous events from
>>     backend to frontend to report number of bytes played by the
>>     frontend (XENSND_EVT_CUR_POS)
>>   - introduce trigger events for playback control: start/stop/pause/resume
>>   - add "req-" prefix to event-channel and ring-ref to unify naming
>>     of the Xen event channels for requests and events
>>   - add XENSND_OP_HW_PARAM_QUERY request to read/update
>>     stream configuration space: request passes desired intervals/formats for
>>     the stream parameters and the response returns allowed intervals and
>>     formats mask that can be used.
>>
>> Changes since v2:
>> 1. Konrad's r-b tag for version patch
>> 2. MAJOR: changed req/resp/evt packet sizes from 32 to 64 octets
>> 3. Reworked XENSND_OP_HW_PARAM_QUERY so it now sends all
>>     parameters at once, allowing to check all the configuration
>>     space.
>> 4. Minor documentation cleanup (added missed "reserved" fields)
>>
>> Changes since v1:
>>
>> 1. Changed protocol version definition from string to integer,
>> so it can easily be used in comparisons.
>> Konrad, I have removed your r-b tag for the reason of this change.
>>
>> 2. In order to provide explicit stream parameter negotiation between
>> backend and frontend the following changes are introduced in the protocol:
>> add XENSND_OP_HW_PARAM_QUERY request to read/update
>> configuration space for the parameter given: request passes
>> desired parameter interval (mask) and the response to this request
>> returns min/max interval (mask) for the parameter to be used.
>>
>> Parameters supported by this request/response:
>>   - format mask
>>   - sample rate interval
>>   - number of channels interval
>>   - buffer size, interval, frames
>>   - period size, interval, frames
>>
>> Oleksandr Andrushchenko (5):
>>    sndif: Introduce protocol version
>>    sndif: Fix missed "reserved" fields in comments
>>    sndif: Make requests and responses 64 octets long
>>    sndif: Add explicit back and front synchronization
>>    sndif: Add explicit back and front parameter negotiation
>>
>>   xen/include/public/io/sndif.h | 322 +++++++++++++++++++++++++++++++++++++++---
>>   1 file changed, 306 insertions(+), 16 deletions(-)
>>
> With Konrad's ack you can have my:
>
> Release-acked-by: Juergen Gross <jgross at suse.com>
Thank you
>
> even if the commit can't be done before the freeze. The header isn't
> used inside Xen so the risk for the release is zero.
This is true
>
> Juergen
Thank you,
Oleksandr