netdev - Re: [PATCH rdma-next 1/8] RDMA/core: Check if client supports IB device or not

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Date:   Mon, 5 Apr 2021 11:46:52 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Gal Pressman <galpress@...zon.com>
Cc:     Doug Ledford <dledford@...hat.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Parav Pandit <parav@...dia.com>,
        "David S. Miller" <davem@...emloft.net>,
        Dennis Dalessandro <dennis.dalessandro@...nelisnetworks.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Karsten Graul <kgraul@...ux.ibm.com>,
        linux-kernel@...r.kernel.org, linux-rdma@...r.kernel.org,
        linux-s390@...r.kernel.org,
        Mike Marciniszyn <mike.marciniszyn@...nelisnetworks.com>,
        netdev@...r.kernel.org, rds-devel@....oracle.com,
        Santosh Shilimkar <santosh.shilimkar@...cle.com>
Subject: Re: [PATCH rdma-next 1/8] RDMA/core: Check if client supports IB
 device or not

On Mon, Apr 05, 2021 at 09:20:32AM +0300, Gal Pressman wrote:
> On 05/04/2021 8:49, Leon Romanovsky wrote:
> > From: Parav Pandit <parav@...dia.com>
> > 
> > RDMA devices are of different transport(iWarp, IB, RoCE) and have
> > different attributes.
> > Not all clients are interested in all type of devices.
> > 
> > Implement a generic callback that each IB client can implement to decide
> > if client add() or remove() should be done by the IB core or not for a
> > given IB device, client combination.
> > 
> > Signed-off-by: Parav Pandit <parav@...dia.com>
> > Signed-off-by: Leon Romanovsky <leonro@...dia.com>
> > ---
> >  drivers/infiniband/core/device.c | 3 +++
> >  include/rdma/ib_verbs.h          | 9 +++++++++
> >  2 files changed, 12 insertions(+)
> > 
> > diff --git a/drivers/infiniband/core/device.c b/drivers/infiniband/core/device.c
> > index c660cef66ac6..c9af2deba8c1 100644
> > --- a/drivers/infiniband/core/device.c
> > +++ b/drivers/infiniband/core/device.c
> > @@ -691,6 +691,9 @@ static int add_client_context(struct ib_device *device,
> >  	if (!device->kverbs_provider && !client->no_kverbs_req)
> >  		return 0;
> >  
> > +	if (client->is_supported && !client->is_supported(device))
> > +		return 0;
> 
> Isn't it better to remove the kverbs_provider flag (from previous if statement)
> and unify it with this generic support check?

I thought about it, but didn't find it worth. The kverbs_provider needs
to be provided by device and all ULPs except uverbs will have the same check.

Thanks