t4_incr_flit
flitp = t4_incr_flit(flitp, sizeof (*ulpmc));
flitp = t4_incr_flit(flitp, sizeof (*ulpsc));
flitp = t4_incr_flit(flitp, sizeof (*cpl));
flitp = t4_incr_flit(flitp, FLIT_NUM_BYTES);