[PATCH v2] kvargs: fix device iterator match from arguments

[Olivier Matz]

Hi Xueming,

On Wed, Nov 24, 2021 at 06:17:40PM +0800, Xueming Li wrote:
> Device iterator RTE_DEV_FOREACH() failed to return devices from
> classifier like "class=vdpa", because matching name from empty kvargs
> returns no result. If device name not specified in kvargs, the function
> should iterate all devices.
> 
> This patch allows empty devargs or devargs without name specified.
> 
> Fixes: 6aebb942907d ("kvargs: add function to get from key and value")
> Cc: olivier.matz at 6wind.com
> 
> Signed-off-by: Xueming Li <xuemingl at nvidia.com>

I just sent a v3 with the unit test.

In case there is an issue with it, your v2 looks good to me:
Acked-by: Olivier Matz <olivier.matz at 6wind.com>

As a side note, I was wondering if we should keep
rte_kvargs_get_with_value() in kvargs api, since there
is no more user. I think there it can still be useful, let's
keep it for now.

Thanks!
Olivier

> ---
> 21.11 specific bug, no copy to stable.org
> ---
>  drivers/bus/auxiliary/auxiliary_params.c | 14 +++++++++-----
>  drivers/bus/vdev/vdev_params.c           | 14 +++++++++-----
>  2 files changed, 18 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/bus/auxiliary/auxiliary_params.c b/drivers/bus/auxiliary/auxiliary_params.c
> index a9c7853ed1d..9cbc1f7c777 100644
> --- a/drivers/bus/auxiliary/auxiliary_params.c
> +++ b/drivers/bus/auxiliary/auxiliary_params.c
> @@ -26,11 +26,15 @@ auxiliary_dev_match(const struct rte_device *dev,
>  {
>  	const struct rte_kvargs *kvlist = _kvlist;
>  	const char *key = auxiliary_params_keys[RTE_AUXILIARY_PARAM_NAME];
> -
> -	if (rte_kvargs_get_with_value(kvlist, key, dev->name) == NULL)
> -		return -1;
> -
> -	return 0;
> +	const char *name;
> +
> +	if (kvlist == NULL)
> +		return 0;
> +	name = rte_kvargs_get(kvlist, key);
> +	if (name == NULL)
> +		/* Iterate all devices if name not specified. */
> +		return 0;
> +	return strcmp(name, dev->name);
>  }
>  
>  void *
> diff --git a/drivers/bus/vdev/vdev_params.c b/drivers/bus/vdev/vdev_params.c
> index 37d95395e7a..b4baecb7c0d 100644
> --- a/drivers/bus/vdev/vdev_params.c
> +++ b/drivers/bus/vdev/vdev_params.c
> @@ -28,11 +28,15 @@ vdev_dev_match(const struct rte_device *dev,
>  {
>  	const struct rte_kvargs *kvlist = _kvlist;
>  	const char *key = vdev_params_keys[RTE_VDEV_PARAM_NAME];
> -
> -	if (rte_kvargs_get_with_value(kvlist, key, dev->name) == NULL)
> -		return -1;
> -
> -	return 0;
> +	const char *name;
> +
> +	if (kvlist == NULL)
> +		return 0;
> +	name = rte_kvargs_get(kvlist, key);
> +	if (name == NULL)
> +		/* Iterate all devices if name not specified. */
> +		return 0;
> +	return strcmp(name, dev->name);
>  }
>  
>  void *
> -- 
> 2.34.0
>