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@xxxxxxxxxxx> 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 >>
