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

["Xueming(Steven) Li" <xuemingl@nvidia.com>]

On Wed, 2021-11-24 at 12:07 +0100, Olivier Matz wrote:
> 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@6wind.com
> > 
> > Signed-off-by: Xueming Li <xuemingl@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@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.

Agree, nice to keep.

> 
> 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
> >