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

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Date:   Thu, 28 Jan 2021 07:41:33 +0200
From:   Leon Romanovsky <leon@...nel.org>
To:     Jason Gunthorpe <jgg@...dia.com>,
        "Saleem, Shiraz" <shiraz.saleem@...el.com>
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>
Subject: Re: [PATCH 07/22] RDMA/irdma: Register an auxiliary driver and
 implement private channel OPs

On Wed, Jan 27, 2021 at 07:16:41PM -0400, Jason Gunthorpe wrote:
> On Wed, Jan 27, 2021 at 10:17:56PM +0000, Saleem, Shiraz wrote:
>
> > Even with another core PCI driver, there still needs to be private
> > communication channel between the aux rdma driver and this PCI
> > driver to pass things like QoS updates.
>
> Data pushed from the core driver to its aux drivers should either be
> done through new callbacks in a struct device_driver or by having a
> notifier chain scheme from the core driver.

Right, and internal to driver/core device_lock will protect from
parallel probe/remove and PCI flows.

I would say that all this handmade register/unregister and peer_client
dance will be gone if driver would use properly auxbus.

Thanks

>
> Jason