SPU2_PL_LEN
data_size &= SPU2_PL_LEN;
packet_log(" Payload length %llu bytes\n", ctrl3 & SPU2_PL_LEN);
ctrl3 = payload_len & SPU2_PL_LEN;
pl_len = ctrl3 & SPU2_PL_LEN;
#define SPU2_MAX_PAYLOAD SPU2_PL_LEN