netdev - RE: [PATCH v2 08/23] RDMA/irdma: Register auxiliary driver and implement private channel OPs

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Date:   Wed, 24 Mar 2021 23:46:42 +0000
From:   "Saleem, Shiraz" <shiraz.saleem@...el.com>
To:     Jason Gunthorpe <jgg@...dia.com>, Leon Romanovsky <leon@...nel.org>
CC:     "dledford@...hat.com" <dledford@...hat.com>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "Ertman, David M" <david.m.ertman@...el.com>,
        "Nguyen, Anthony L" <anthony.l.nguyen@...el.com>,
        "Ismail, Mustafa" <mustafa.ismail@...el.com>
Subject: RE: [PATCH v2 08/23] RDMA/irdma: Register auxiliary driver and
 implement private channel OPs

> Subject: Re: [PATCH v2 08/23] RDMA/irdma: Register auxiliary driver and
> implement private channel OPs
> 
> On Wed, Mar 24, 2021 at 04:17:20PM +0200, Leon Romanovsky wrote:
> > On Wed, Mar 24, 2021 at 11:00:46AM -0300, Jason Gunthorpe wrote:
> > > On Wed, Mar 24, 2021 at 03:47:34PM +0200, Leon Romanovsky wrote:
> > > > On Tue, Mar 23, 2021 at 06:59:52PM -0500, Shiraz Saleem wrote:
> > > > > From: Mustafa Ismail <mustafa.ismail@...el.com>
> > > > >
> > > > > Register auxiliary drivers which can attach to auxiliary RDMA
> > > > > devices from Intel PCI netdev drivers i40e and ice. Implement
> > > > > the private channel ops, and register net notifiers.
> > > > >
> > > > > Signed-off-by: Mustafa Ismail <mustafa.ismail@...el.com>
> > > > > Signed-off-by: Shiraz Saleem <shiraz.saleem@...el.com>
> > > > > drivers/infiniband/hw/irdma/i40iw_if.c | 229 +++++++++++++
> > > > >  drivers/infiniband/hw/irdma/main.c     | 382 ++++++++++++++++++++++
> > > > >  drivers/infiniband/hw/irdma/main.h     | 565
> +++++++++++++++++++++++++++++++++
> > > > >  3 files changed, 1176 insertions(+)  create mode 100644
> > > > > drivers/infiniband/hw/irdma/i40iw_if.c
> > > > >  create mode 100644 drivers/infiniband/hw/irdma/main.c
> > > > >  create mode 100644 drivers/infiniband/hw/irdma/main.h
> > > >
> > > > <...>
> > > >
> > > > > +/* client interface functions */ static const struct
> > > > > +i40e_client_ops i40e_ops = {
> > > > > +	.open = i40iw_open,
> > > > > +	.close = i40iw_close,
> > > > > +	.l2_param_change = i40iw_l2param_change };
> > > > > +
> > > > > +static struct i40e_client i40iw_client = {
> > > > > +	.ops = &i40e_ops,
> > > > > +	.type = I40E_CLIENT_IWARP,
> > > > > +};
> > > > > +
> > > > > +static int i40iw_probe(struct auxiliary_device *aux_dev, const
> > > > > +struct auxiliary_device_id *id) {
> > > > > +	struct i40e_auxiliary_device *i40e_adev = container_of(aux_dev,
> > > > > +							       struct
> i40e_auxiliary_device,
> > > > > +							       aux_dev);
> > > > > +	struct i40e_info *cdev_info = i40e_adev->ldev;
> > > > > +
> > > > > +	strncpy(i40iw_client.name, "irdma", I40E_CLIENT_STR_LENGTH);
> > > > > +	cdev_info->client = &i40iw_client;
> > > > > +	cdev_info->aux_dev = aux_dev;
> > > > > +
> > > > > +	return cdev_info->ops->client_device_register(cdev_info);
> > > >
> > > > Why do we need all this indirection? I see it as leftover from
> > > > previous version where you mixed auxdev with your peer registration logic.
> > >
> > > I think I said the new stuff has to be done sanely, but the i40iw
> > > stuff is old and already like this.
> >
> > They declared this specific "ops" a couple of lines above and all the
> > functions are static. At least for the new code, in the irdma, this "ops"
> > thing is not needed.
> 
> It is the code in the 'core' i40iw driver that requries this, AFAICT
> 
 Yes.