linux-kernel - Re: [RFC PATCH 00/10] Introduction of rpmsg flow control service

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Date:   Wed, 25 May 2022 10:57:06 +0200
From:   Arnaud POULIQUEN <arnaud.pouliquen@...s.st.com>
To:     Mathieu Poirier <mathieu.poirier@...aro.org>
CC:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        <linux-remoteproc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        Deepak Kumar Singh <quic_deesin@...cinc.com>,
        Chris Lew <quic_clew@...cinc.com>,
        Xiang Xiao <xiaoxiang@...omi.com>
Subject: Re: [RFC PATCH 00/10] Introduction of rpmsg flow control service

Hi Mathieu,

On 5/24/22 17:34, Mathieu Poirier wrote:
> Hi Arnaud,
> 
> I added your patchset to my review list.  Unfortunately it sits behind
> a sizable backlog and as such I won't be able to get to it for some
> time.

No worries, I hope to get some feedbacks and to have discussion on the
topic from some other people as well 
FYI, as a similar Pull request exists on OpenAMP github, I requsted in the
OpenAMP PR to centralize all the discussions around the design choice in this
thread. The aim is that we have a single discussion thread to find a consensus
on the way of implementing such service on virtio backend.

Creating a specific rpmsg service is one approach, some other can exist...

Regards,
Arnaud


> 
> Thanks,
> Mathieu
> 
> On Fri, 20 May 2022 at 02:30, Arnaud Pouliquen
> <arnaud.pouliquen@...s.st.com> wrote:
>>
>> This series proposes an implementation for the rpmsg virtio transport
>> backend, of the signaling API proposed by Deepak Kumar Singh:
>> "rpmsg and glink signaling API support" [1]
>>
>> The aim of the series is to offer the possibility for an endpoint to inform
>> a remote endpoint about its state, based on a software flow control[2].
>>
>> For this a new rpmsg service( with a fixed address 64) is proposed.
>> It is responsible for:
>> - transmitting local endpoint flow control information to the remote side,
>> - informing a local endpoint about a remote endpoint flow control.
>>
>> For the rpmsg virtio transport layer the service is negotiated thanks to the
>> virtio feature flag: VIRTIO_RPMSG_F_FC
>>
>> Notice that this pull request introduces new feature in the rpmsg protocol,
>> So it has to be aligned with OpenAMP implementation.
>> Pending OpenAMP pull request is available here:
>> https://github.com/OpenAMP/open-amp/pull/394
>>
>>
>> [1]https://lkml.org/lkml/2022/1/18/867
>> [2]https://en.wikipedia.org/wiki/Software_flow_control
>>
>> Arnaud Pouliquen (8):
>>   rpmsg: core: Add rpmsg device remote flow control announcement ops
>>   rpmsg: virtio: Implement the announce_remote_fc ops
>>   rpmsg: Introduce flow control channel driver
>>   rpmsg: virtio: Add support of the VIRTIO_RPMSG_F_FC feature
>>   rpmsg: virtio: Implement the set_flow_control ops
>>   rpmsg: Add the destination address in rpmsg_set_flow_control
>>   rpmsg: tty : Add the support of the flow control
>>   rpmsg: virtio: Set default dst address on flow control
>>
>> Deepak Kumar Singh (2):
>>   rpmsg: core: Add signal API support
>>   rpmsg: char: Add TIOCMGET/TIOCMSET ioctl support
>>
>>  drivers/rpmsg/Kconfig            |  11 +++
>>  drivers/rpmsg/Makefile           |   1 +
>>  drivers/rpmsg/rpmsg_char.c       |  56 +++++++++++++--
>>  drivers/rpmsg/rpmsg_core.c       |  47 +++++++++++++
>>  drivers/rpmsg/rpmsg_fc.c         | 113 +++++++++++++++++++++++++++++++
>>  drivers/rpmsg/rpmsg_internal.h   |   9 +++
>>  drivers/rpmsg/virtio_rpmsg_bus.c | 111 +++++++++++++++++++++++++++++-
>>  drivers/tty/rpmsg_tty.c          |  50 ++++++++++++++
>>  include/linux/rpmsg.h            |  15 ++++
>>  include/linux/rpmsg/fc.h         |  51 ++++++++++++++
>>  10 files changed, 456 insertions(+), 8 deletions(-)
>>  create mode 100644 drivers/rpmsg/rpmsg_fc.c
>>  create mode 100644 include/linux/rpmsg/fc.h
>>
>> --
>> 2.25.1
>>