linux-kernel - [PATCH iproute2-next v3 6/7] iplink_can: add CAN XL transceiver mode setting (TMS) support

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Message-Id: <20251203-canxl-netlink-v3-6-999f38fae8c2@kernel.org>
Date: Wed, 03 Dec 2025 19:24:33 +0100
From: Vincent Mailhol <mailhol@...nel.org>
To: netdev@...r.kernel.org, Stephen Hemminger <stephen@...workplumber.org>, 
 Marc Kleine-Budde <mkl@...gutronix.de>, 
 Oliver Hartkopp <socketcan@...tkopp.net>, David Ahern <dsahern@...nel.org>
Cc: Rakuram Eswaran <rakuram.e96@...il.com>, 
 Stéphane Grosjean <stephane.grosjean@...e.fr>, 
 linux-kernel@...r.kernel.org, linux-can@...r.kernel.org, 
 Vincent Mailhol <mailhol@...nel.org>
Subject: [PATCH iproute2-next v3 6/7] iplink_can: add CAN XL transceiver
 mode setting (TMS) support

This is the iproute2 counterpart of Linux kernel's commit 233134af2086
("can: netlink: add CAN_CTRLMODE_XL_TMS flag").

The Transceiver Mode Switching (TMS) indicates whether the CAN XL
controller shall use the PWM or NRZ encoding during the data phase.

The term "transceiver mode switching" is used in both ISO 11898-1 and CiA
612-2 (although only the latter one uses the abbreviation TMS). We adopt
the same naming convention here for consistency.

Add the "tms" option to iplink_can which controls the CAN_CTRLMODE_XL_TMS
flag of the CAN netlink interface.

Signed-off-by: Vincent Mailhol <mailhol@...nel.org>
---
Changelog:

v1 -> v2:

  - s/XL-TMS/TMS/g in print_ctrlmode()
  - s/matches/strcmp/g in can_parse_opt()
---
 ip/iplink_can.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/ip/iplink_can.c b/ip/iplink_can.c
index 8529a625..1cc943bb 100644
--- a/ip/iplink_can.c
+++ b/ip/iplink_can.c
@@ -49,6 +49,7 @@ static void print_usage(FILE *f)
 		"\t[ restricted { on | off } ]\n"
 		"\t[ xl { on | off } ]\n"
 		"\t[ xtdc-mode { auto | manual | off } ]\n"
+		"\t[ tms { on | off } ]\n"
 		"\n"
 		"\t[ restart-ms TIME-MS ]\n"
 		"\t[ restart ]\n"
@@ -127,6 +128,7 @@ static void print_ctrlmode(enum output_type t, __u32 flags, const char *key)
 	print_flag(t, &flags, CAN_CTRLMODE_XL, "XL");
 	print_flag(t, &flags, CAN_CTRLMODE_XL_TDC_AUTO, "XL-TDC-AUTO");
 	print_flag(t, &flags, CAN_CTRLMODE_XL_TDC_MANUAL, "XL-TDC-MANUAL");
+	print_flag(t, &flags, CAN_CTRLMODE_XL_TMS, "TMS");
 
 	if (flags)
 		print_hex(t, NULL, "%x", flags);
@@ -333,6 +335,9 @@ static int can_parse_opt(struct link_util *lu, int argc, char **argv,
 				invarg("\"xtdc-mode\" must be either of \"auto\", \"manual\" or \"off\"",
 					*argv);
 			}
+		} else if (strcmp(*argv, "tms") == 0) {
+			NEXT_ARG();
+			set_ctrlmode("tms", *argv, &cm, CAN_CTRLMODE_XL_TMS);
 		} else if (matches(*argv, "restart") == 0) {
 			__u32 val = 1;
 

-- 
2.51.2