netdev - Re: [PATCH v2 0/8] Introduce fwctl subystem

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Message-ID: <20240624161802.1b7c962d@kernel.org>
Date: Mon, 24 Jun 2024 16:18:02 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Jason Gunthorpe <jgg@...dia.com>
Cc: Jonathan Corbet <corbet@....net>, Itay Avraham <itayavr@...dia.com>,
 Leon Romanovsky <leon@...nel.org>, linux-doc@...r.kernel.org,
 linux-rdma@...r.kernel.org, netdev@...r.kernel.org, Paolo Abeni
 <pabeni@...hat.com>, Saeed Mahameed <saeedm@...dia.com>, Tariq Toukan
 <tariqt@...dia.com>, Andy Gospodarek <andrew.gospodarek@...adcom.com>, Aron
 Silverton <aron.silverton@...cle.com>, Dan Williams
 <dan.j.williams@...el.com>, David Ahern <dsahern@...nel.org>, Christoph
 Hellwig <hch@...radead.org>, Jiri Pirko <jiri@...dia.com>, Leonid Bloch
 <lbloch@...dia.com>, Leon Romanovsky <leonro@...dia.com>,
 linux-cxl@...r.kernel.org, patches@...ts.linux.dev
Subject: Re: [PATCH v2 0/8] Introduce fwctl subystem

On Mon, 24 Jun 2024 19:47:24 -0300 Jason Gunthorpe wrote:
> fwctl is a new subsystem intended to bring some common rules and order to
> the growing pattern of exposing a secure FW interface directly to
> userspace. Unlike existing places like RDMA/DRM/VFIO/uacce that are
> exposing a device for datapath operations fwctl is focused on debugging,
> configuration and provisioning of the device. It will not have the
> necessary features like interrupt delivery to support a datapath.
> 
> This concept is similar to the long standing practice in the "HW" RAID
> space of having a device specific misc device to manager the RAID
> controller FW. fwctl generalizes this notion of a companion debug and
> management interface that goes along with a dataplane implemented in an
> appropriate subsystem.
> 
> The need for this has reached a critical point as many users are moving to
> run lockdown enabled kernels. Several existing devices have had long
> standing tooling for management that relied on /sys/../resource0 or PCI
> config space access which is not permitted in lockdown. A major point of
> fwctl is to define and document the rules that a device must follow to
> expose a lockdown compatible RPC.
> 
> Based on some discussion fwctl splits the RPCs into four categories
> 
> 	FWCTL_RPC_CONFIGURATION
> 	FWCTL_RPC_DEBUG_READ_ONLY
> 	FWCTL_RPC_DEBUG_WRITE
> 	FWCTL_RPC_DEBUG_WRITE_FULL

Nacked-by: Jakub Kicinski <kuba@...nel.org>