iplink_can: add Classical CAN frame LEN8_DLC support

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>
Signed-off-by: David Ahern <dsahern@kernel.org>

diff --git a/ip/iplink_can.c b/ip/iplink_can.c
index 735ab94122e0d566894c41044ba3d6e07f6386dc..6a26f3ff0739ba199ea7528403033e923999f585 100644 (file)
--- a/ip/iplink_can.c
+++ b/ip/iplink_can.c
@@ -37,6 +37,7 @@ static void print_usage(FILE *f)
                "\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"
@@ -103,6 +104,7 @@ static void print_ctrlmode(FILE *f, __u32 cm)
        _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);
@@ -211,6 +213,10 @@ static int can_parse_opt(struct link_util *lu, int argc, char **argv,
                        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;