From: Jason Gunthorpe <jgg@ziepe.ca>
To: Greg KH <gregkh@linuxfoundation.org>
Cc: Jeff Kirsher <jeffrey.t.kirsher@intel.com>,
davem@davemloft.net, Dave Ertman <david.m.ertman@intel.com>,
netdev@vger.kernel.org, linux-rdma@vger.kernel.org,
nhorman@redhat.com, sassmann@redhat.com, parav@mellanox.com,
Kiran Patil <kiran.patil@intel.com>
Subject: Re: [net-next 1/1] virtual-bus: Implementation of Virtual Bus
Date: Tue, 12 Nov 2019 20:08:19 -0400 [thread overview]
Message-ID: <20191113000819.GB19615@ziepe.ca> (raw)
In-Reply-To: <20191112212826.GA1837470@kroah.com>
On Tue, Nov 12, 2019 at 10:28:26PM +0100, Greg KH wrote:
> > + */
> > +struct virtbus_device {
> > + const char *name;
> > + int id;
> > + const struct virtbus_dev_id *dev_id;
> > + struct device dev;
> > + void *data;
> > +};
> > +
> > +struct virtbus_driver {
> > + int (*probe)(struct virtbus_device *);
> > + int (*remove)(struct virtbus_device *);
> > + void (*shutdown)(struct virtbus_device *);
> > + int (*suspend)(struct virtbus_device *, pm_message_t state);
> > + int (*resume)(struct virtbus_device *);
> > + struct device_driver driver;
> > + const struct virtbus_dev_id *id_table;
> > +};
> > +
> > +#define virtbus_get_dev_id(vdev) ((vdev)->id_entry)
> > +#define virtbus_get_devdata(dev) ((dev)->devdata)
>
> What are these for?
As far as I can see, the scheme here, using the language from the most
recent discussion is:
// in core or netdev module
int mlx5_core_create()
{
struct mlx5_core_dev *core = kzalloc(..)
[..]
core->vdev = virtbus_dev_alloc("mlx5_core", core);
}
// in rdma module
static int mlx5_rdma_probe(struct virtbus_device *dev)
{
// Get the value passed to virtbus_dev_alloc()
struct mlx5_core_dev *core = virtbus_get_devdata(dev)
// Use the huge API surrounding struct mlx5_core_dev
qp = mlx5_core_create_qp(core, ...);
}
static struct virtbus_driver mlx5_rdma_driver = {
.probe = mlx5_rdma_probe,
.match = {"mlx5_core"}
}
Drivers that match "mlx5_core" know that the opaque
'virtbus_get_devdata()' is a 'struct mlx5_core_dev *' and use that
access the core driver.
A "ice_core" would know it is some 'struct ice_core_dev *' for Intel
and uses that pointer, etc.
ie it is just a way to a pass a 'void *' from one module to another
while using the driver core to manage module autoloading and binding.
Jason
next prev parent reply other threads:[~2019-11-13 0:08 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-11 19:22 [net-next 1/1] virtual-bus: Implementation of Virtual Bus Jeff Kirsher
2019-11-12 20:59 ` Jason Gunthorpe
2019-11-12 21:18 ` Ertman, David M
2019-11-12 21:28 ` Greg KH
2019-11-13 0:08 ` Jason Gunthorpe [this message]
2019-11-13 1:03 ` Parav Pandit
2019-11-13 1:10 ` Jason Gunthorpe
2019-11-13 6:44 ` Parav Pandit
2019-11-13 1:09 ` Ertman, David M
2019-11-13 7:03 ` Parav Pandit
2019-11-15 21:17 ` Ertman, David M
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