linux-kernel - [RFC PATCH 0/2] can: add dummy_can termination and update SocketCAN docs for CAN XL

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Message-ID: <20251127191808.144723-1-rakuram.e96@gmail.com>
Date: Fri, 28 Nov 2025 00:48:06 +0530
From: Rakuram Eswaran <rakuram.e96@...il.com>
To: linux-can@...r.kernel.org
Cc: mkl@...gutronix.de,
	socketcan@...tkopp.net,
	mailhol@...nel.org,
	khalid@...nel.org,
	skhan@...uxfoundation.org,
	linux-kernel@...r.kernel.org,
	rakuram.e96@...il.com,
	david.hunter.linux@...il.com,
	linux-kernel-mentees@...ts.linux.dev
Subject: [RFC PATCH 0/2] can: add dummy_can termination and update SocketCAN docs for CAN XL

This RFC series introduces two changes related to CAN XL support:

  1. Add termination configuration support to the dummy_can driver,
     enabling termination testing with iproute2.

  2. Update the SocketCAN documentation to describe CAN XL operation,
     including MTU changes, bittiming/XBTR settings, mixed-mode
     behaviour, error signalling, and example iproute2 usage.

The goal of this RFC is to validate whether the proposed behaviour and
documentation match the expectations for the ongoing CAN XL upstream
work. Feedback from the maintainers is highly appreciated.

Base commit: 
commit 30f09200cc4a ("Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux")

For testing, this series was applied on top of the following patchsets:

  * "treewide: remove can_change_mtu()" (Vincent Mailhol)
        b4 am 20251003-remove-can_change_mtu-v1-1-337f8bc21181@...nel.org
        git am ./20251003_mailhol_can_treewide_remove_can_change_mtu.mbx

  * "can: netlink: add CAN XL support" (Marc Kleine-Budde)
        b4 am 20251126-canxl-v8-0-e7e3eb74f889@...gutronix.de
        git am ./v8_20251126_mkl_can_netlink_add_can_xl_support.mbx

Testing was performed using the iproute2-next tree (canxl-netlink branch),
which contains the required CAN XL netlink support for validating
these changes.

Rakuram Eswaran (2):
  can: dummy_can: add CAN termination support
  docs: can: update SocketCAN documentation for CAN XL

 Documentation/networking/can.rst | 470 ++++++++++++++++++++++++++++---
 drivers/net/can/dummy_can.c      |  21 ++
 2 files changed, 454 insertions(+), 37 deletions(-)

-- 
2.51.0