netdev - Re: [PATCH v4 10/10] bnxt: Create an auxiliary device for fwctl

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Message-ID: <20250211075553.GF17863@unreal>
Date: Tue, 11 Feb 2025 09:55:53 +0200
From: Leon Romanovsky <leon@...nel.org>
To: Jakub Kicinski <kuba@...nel.org>, Jason Gunthorpe <jgg@...dia.com>
Cc: Saeed Mahameed <saeedm@...dia.com>,
	Andy Gospodarek <andrew.gospodarek@...adcom.com>,
	Aron Silverton <aron.silverton@...cle.com>,
	Dan Williams <dan.j.williams@...el.com>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Dave Jiang <dave.jiang@...el.com>, David Ahern <dsahern@...nel.org>,
	Andy Gospodarek <gospo@...adcom.com>,
	Christoph Hellwig <hch@...radead.org>,
	Itay Avraham <itayavr@...dia.com>, Jiri Pirko <jiri@...dia.com>,
	Jonathan Cameron <Jonathan.Cameron@...wei.com>,
	Leonid Bloch <lbloch@...dia.com>, linux-cxl@...r.kernel.org,
	linux-rdma@...r.kernel.org, netdev@...r.kernel.org,
	"Nelson, Shannon" <shannon.nelson@....com>,
	Michael Chan <michael.chan@...adcom.com>
Subject: Re: [PATCH v4 10/10] bnxt: Create an auxiliary device for fwctl_bnxt

On Mon, Feb 10, 2025 at 05:04:23PM -0800, Jakub Kicinski wrote:
> On Fri, 7 Feb 2025 21:16:47 -0400 Jason Gunthorpe wrote:
> > On Fri, Feb 07, 2025 at 01:51:11PM -0800, Jakub Kicinski wrote:
> > 
> > > But if you agree the netdev doesn't need it seems like a fairly
> > > straightforward way to unblock your progress.  
> > 
> > I'm trying to understand what you are suggesting here.
> > 
> > We have many scenarios where mlx5_core spawns all kinds of different
> > devices, including recovery cases where there is no networking at all
> > and only fwctl. So we can't just discard the aux dev or mlx5_core
> > triggered setup without breaking scenarios.
> > 
> > However, you seem to be suggesting that netdev-only configurations (ie
> > netdev loaded but no rdma loaded) should disable fwctl. Is that the
> > case? All else would remain the same. It is very ugly but I could see
> > a technical path to do it, and would consider it if that brings peace.
> 
> Yes, when RDMA driver is not loaded there should be no access to fwctl.

There are users mentioned in cover letter, which need FWCTL without RDMA.
https://lore.kernel.org/all/0-v4-0cf4ec3b8143+4995-fwctl_jgg@nvidia.com/

I want to suggest something different. What about to move all XXX_core
logic (mlx5_core, bnxt_core, e.t.c.) from netdev to some other dedicated
place?

There is no technical need to have PCI/FW logic inside networking stack.

Thanks