linux-kernel - Re: [PATCH 1/1] rpmsg: core: Add wildcard match for name service

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Date:   Thu, 13 Feb 2020 14:56:10 +0100
From:   Arnaud POULIQUEN <arnaud.pouliquen@...com>
To:     Mathieu Poirier <mathieu.poirier@...aro.org>,
        <bjorn.andersson@...aro.org>, <ohad@...ery.com>
CC:     <s-anna@...com>, <xiaoxiang@...omi.com>, <t-kristo@...com>,
        <loic.pallardy@...com>, <remoteproc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] rpmsg: core: Add wildcard match for name service

Hi Mathieu,

Simple and elegant :)
I tested it with my rpmsg_tty client which defines several IDs: work fine.
  
Just a question regarding the comment else
Acked-by: Arnaud Pouliquen <arnaud.pouliquen@...com>
 

On 2/12/20 10:12 PM, Mathieu Poirier wrote:
> Adding the capability to supplement the base definition published
> by an rpmsg_driver with a postfix description so that it is possible
> for several entity to use the same service.
> 
> Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>
> ---
>  drivers/rpmsg/rpmsg_core.c | 20 +++++++++++++++++++-
>  1 file changed, 19 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/rpmsg/rpmsg_core.c b/drivers/rpmsg/rpmsg_core.c
> index e330ec4dfc33..bfd25978fa35 100644
> --- a/drivers/rpmsg/rpmsg_core.c
> +++ b/drivers/rpmsg/rpmsg_core.c
> @@ -399,7 +399,25 @@ ATTRIBUTE_GROUPS(rpmsg_dev);
>  static inline int rpmsg_id_match(const struct rpmsg_device *rpdev,
>  				  const struct rpmsg_device_id *id)
>  {
> -	return strncmp(id->name, rpdev->id.name, RPMSG_NAME_SIZE) == 0;
> +	size_t len = min_t(size_t, strlen(id->name), RPMSG_NAME_SIZE);
> +
> +	/*
> +	 * Allow for wildcard matches.  For example if rpmsg_driver::id_table
> +	 * is:
> +	 *
> +	 * static struct rpmsg_device_id rpmsg_driver_sample_id_table[] = {
> +	 *      { .name = "rpmsg-client-sample" },
> +	 *      { },
> +	 * }
> +	 *
> +	 * Then it is possible to support "rpmsg-client-sample*", i.e:
> +	 *	rpmsg-client-sample
> +	 *	rpmsg-client-sample_instance0
> +	 *	rpmsg-client-sample_instance1
> +	 *	...
> +	 *	rpmsg-client-sample_instanceX
> +	 */
What about adding this as function documentation? i don't know if it makes sense
for a static volatile function...

Regards
Arnaud

> +	return strncmp(id->name, rpdev->id.name, len) == 0;
>  }
>  
>  /* match rpmsg channel and rpmsg driver */
>