linux-kernel - Re: [PATCH v4 8/8] rpmsg: Turn name service into a stand alone driver

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Date:   Wed, 4 Nov 2020 15:01:44 +0100
From:   Guennadi Liakhovetski <guennadi.liakhovetski@...ux.intel.com>
To:     Mathieu Poirier <mathieu.poirier@...aro.org>
Cc:     ohad@...ery.com, bjorn.andersson@...aro.org,
        arnaud.pouliquen@...com, linux-remoteproc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 8/8] rpmsg: Turn name service into a stand alone driver

Hi Mathieu, Arnaud,

I've tried the patch set with my VirtIO / vhost audio implementation, 
in general it worked quite well, but I did need one chamge, which 
should be improved in this patch:

On Tue, Oct 27, 2020 at 11:52:18AM -0600, Mathieu Poirier wrote:
> From: Arnaud Pouliquen <arnaud.pouliquen@...com>
> 
> Make the RPMSG name service announcement a stand alone driver so that it
> can be reused by other subsystems.  It is also the first step in making the
> functionatlity transport independent, i.e that is not tied to virtIO.
> 
> Co-developed-by: Mathieu Poirier <mathieu.poirier@...aro.org>
> Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@...com>
> ---

[snip]

> diff --git a/include/linux/rpmsg_ns.h b/include/linux/rpmsg_ns.h
> index bb479f430080..42786bb759b5 100644
> --- a/include/linux/rpmsg_ns.h
> +++ b/include/linux/rpmsg_ns.h
> @@ -39,4 +39,21 @@ enum rpmsg_ns_flags {
>  /* Address 53 is reserved for advertising remote services */
>  #define RPMSG_NS_ADDR			(53)
>  
> +/**
> + * rpmsg_ns_register_device() - register name service device based on rpdev
> + * @rpdev: prepared rpdev to be used for creating endpoints
> + *
> + * This function wraps rpmsg_register_device() preparing the rpdev for use as
> + * basis for the rpmsg name service device.
> + */
> +static inline int rpmsg_ns_register_device(struct rpmsg_device *rpdev)
> +{
> +       strcpy(rpdev->id.name, "rpmsg_ns");

you need to

#include <linux/rpmsg.h>

in this file for rpdev definition. Or you could leave this function in 
rpmsg_ns.c, then it's enough to forward-declare struct rpdev here.

Thanks
Guennadi

> +       rpdev->driver_override = "rpmsg_ns";
> +       rpdev->src = RPMSG_NS_ADDR;
> +       rpdev->dst = RPMSG_NS_ADDR;
> +
> +       return rpmsg_register_device(rpdev);
> +}
> +
>  #endif
> -- 
> 2.25.1
>