netdev - RE: [RFC PATCH v4 10/25] RDMA/irdma: Add driver framework definitions

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Date:   Thu, 20 Feb 2020 22:24:05 +0000
From:   Parav Pandit <parav@...lanox.com>
To:     "Saleem, Shiraz" <shiraz.saleem@...el.com>,
        "Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
CC:     "Ismail, Mustafa" <mustafa.ismail@...el.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "nhorman@...hat.com" <nhorman@...hat.com>,
        "sassmann@...hat.com" <sassmann@...hat.com>,
        "jgg@...pe.ca" <jgg@...pe.ca>
Subject: RE: [RFC PATCH v4 10/25] RDMA/irdma: Add driver framework definitions



> From: Saleem, Shiraz <shiraz.saleem@...el.com>
> Sent: Tuesday, February 18, 2020 2:43 PM
> To: Parav Pandit <parav@...lanox.com>; Kirsher, Jeffrey T
> <jeffrey.t.kirsher@...el.com>; davem@...emloft.net;
> gregkh@...uxfoundation.org
> Cc: Ismail, Mustafa <mustafa.ismail@...el.com>; netdev@...r.kernel.org;
> linux-rdma@...r.kernel.org; nhorman@...hat.com; sassmann@...hat.com;
> jgg@...pe.ca
> Subject: RE: [RFC PATCH v4 10/25] RDMA/irdma: Add driver framework
> definitions
> 
> [..]
> 
> > > +static int irdma_devlink_reload_up(struct devlink *devlink,
> > > +				   struct netlink_ext_ack *extack) {
> > > +	struct irdma_dl_priv *priv = devlink_priv(devlink);
> > > +	union devlink_param_value saved_value;
> > > +	const struct virtbus_dev_id *id = priv->vdev->matched_element;
> >
> > Like irdma_probe(), struct iidc_virtbus_object *vo is accesible for the given
> priv.
> > Please use struct iidc_virtbus_object for any sharing between two drivers.
> > matched_element modification inside the virtbus match() function and
> > accessing pointer to some driver data between two driver through this
> > matched_element is not appropriate.
> 
> We can possibly avoid matched_element and driver data look up here.
> But fundamentally, at probe time (see irdma_gen_probe) the irdma driver
> needs to know which generation type of vdev we bound to. i.e. i40e or ice ?
> since we support both.
> And based on it, extract the driver specific virtbus device object, i.e
> i40e_virtbus_device vs iidc_virtbus_object and init that device.
> 
> Accessing driver_data off the vdev matched entry in irdma_virtbus_id_table
> is how we know this generation info and make the decision.
> 
If there is single irdma driver for two different virtbus device types, it is better to have two instances of virtbus_register_driver() with different matching string/id.
So based on the probe(), it will be clear with virtbus device of interest got added.
This way, code will have clear separation between two device types.