netdev - RE: [PATCH 07/22] RDMA/irdma: Register an auxiliary driver and implement private channel OPs

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Date:   Tue, 26 Jan 2021 00:39:53 +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>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.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>,
        "Keller, Jacob E" <jacob.e.keller@...el.com>,
        "jiri@...dia.com" <jiri@...dia.com>,
        "Samudrala, Sridhar" <sridhar.samudrala@...el.com>,
        "Williams, Dan J" <dan.j.williams@...el.com>
Subject: RE: [PATCH 07/22] RDMA/irdma: Register an auxiliary driver and
 implement private channel OPs

> Subject: Re: [PATCH 07/22] RDMA/irdma: Register an auxiliary driver and
> implement private channel OPs
> 
> On Sun, Jan 24, 2021 at 03:45:51PM +0200, Leon Romanovsky wrote:
> > On Fri, Jan 22, 2021 at 05:48:12PM -0600, Shiraz Saleem wrote:
> > > From: Mustafa Ismail <mustafa.ismail@...el.com>
> > >
> > > Register irdma as an auxiliary driver which can attach to auxiliary
> > > RDMA devices from Intel PCI netdev drivers i40e and ice. Implement
> > > the private channel ops, add basic devlink support in the driver and
> > > register net notifiers.
> >
> > Devlink part in "the RDMA client" is interesting thing.
> >
> > The idea behind auxiliary bus was that PCI logic will stay at one
> > place and devlink considered as the tool to manage that.
> 
> Yes, this doesn't seem right, I don't think these auxiliary bus objects should have
> devlink instances, or at least someone from devlink land should approve of the
> idea.
> 

In our model, we have one auxdev (for RDMA) per PCI device function owned by netdev driver
and one devlink instance per auxdev. Plus there is an Intel netdev driver for each HW generation.
Moving the devlink logic to the PCI netdev driver would mean duplicating the same set of RDMA
params in each Intel netdev driver. Additionally, plumbing RDMA specific params in the netdev
driver sort of seems misplaced to me.

devlink is on a per 'struct device' object right? Should we be limiting ourselves in its
usage to only the PCI driver and PCI dev? And not other devices like auxdev?

To Leon's question on number of devlink instances, I think it is going to be same if you implement it in netdev or RDMA driver in this case.

Shiraz