CAN_EFF_RCV_HASH_BITS
#define CAN_EFF_RCV_ARRAY_SZ (1 << CAN_EFF_RCV_HASH_BITS)
hash ^= can_id >> CAN_EFF_RCV_HASH_BITS;
hash ^= can_id >> (2 * CAN_EFF_RCV_HASH_BITS);
return hash & ((1 << CAN_EFF_RCV_HASH_BITS) - 1);