RXBDLC_OFF
#define RXBDLC(n) (((n) * 0x10) + 0x60 + RXBDLC_OFF)
len = can_cc_dlc2len(buf[RXBDLC_OFF] & RXBDLC_LEN_MASK);
if (buf[RXBDLC_OFF] & RXBDLC_RTR)
frame->len = can_cc_dlc2len(buf[RXBDLC_OFF] & RXBDLC_LEN_MASK);