[PATCH RESEND iproute2 5.11] iplink_can: add Classical CAN frame LEN8_DLC support

[Oliver Hartkopp <socketcan@hartkopp.net>]

The len8_dlc element is filled by the CAN interface driver and used for CAN
frame creation by the CAN driver when the CAN_CTRLMODE_CC_LEN8_DLC flag is
supported by the driver and enabled via netlink configuration interface.

Add the command line support for cc-len8-dlc for Linux 5.11+

Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
---
 ip/iplink_can.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/ip/iplink_can.c b/ip/iplink_can.c
index 735ab941..6a26f3ff 100644
--- a/ip/iplink_can.c
+++ b/ip/iplink_can.c
@@ -35,10 +35,11 @@ static void print_usage(FILE *f)
 		"\t[ one-shot { on | off } ]\n"
 		"\t[ berr-reporting { on | off } ]\n"
 		"\t[ fd { on | off } ]\n"
 		"\t[ fd-non-iso { on | off } ]\n"
 		"\t[ presume-ack { on | off } ]\n"
+		"\t[ cc-len8-dlc { on | off } ]\n"
 		"\n"
 		"\t[ restart-ms TIME-MS ]\n"
 		"\t[ restart ]\n"
 		"\n"
 		"\t[ termination { 0..65535 } ]\n"
@@ -101,10 +102,11 @@ static void print_ctrlmode(FILE *f, __u32 cm)
 	_PF(CAN_CTRLMODE_ONE_SHOT, "ONE-SHOT");
 	_PF(CAN_CTRLMODE_BERR_REPORTING, "BERR-REPORTING");
 	_PF(CAN_CTRLMODE_FD, "FD");
 	_PF(CAN_CTRLMODE_FD_NON_ISO, "FD-NON-ISO");
 	_PF(CAN_CTRLMODE_PRESUME_ACK, "PRESUME-ACK");
+	_PF(CAN_CTRLMODE_CC_LEN8_DLC, "CC-LEN8-DLC");
 #undef _PF
 	if (cm)
 		print_hex(PRINT_ANY, NULL, "%x", cm);
 	close_json_array(PRINT_ANY, "> ");
 }
@@ -209,10 +211,14 @@ static int can_parse_opt(struct link_util *lu, int argc, char **argv,
 				     CAN_CTRLMODE_FD_NON_ISO);
 		} else if (matches(*argv, "presume-ack") == 0) {
 			NEXT_ARG();
 			set_ctrlmode("presume-ack", *argv, &cm,
 				     CAN_CTRLMODE_PRESUME_ACK);
+		} else if (matches(*argv, "cc-len8-dlc") == 0) {
+			NEXT_ARG();
+			set_ctrlmode("cc-len8-dlc", *argv, &cm,
+				     CAN_CTRLMODE_CC_LEN8_DLC);
 		} else if (matches(*argv, "restart") == 0) {
 			__u32 val = 1;
 
 			addattr32(n, 1024, IFLA_CAN_RESTART, val);
 		} else if (matches(*argv, "restart-ms") == 0) {
-- 
2.29.2