sc_mtu_to_threshold
sc_mtu_to_threshold(dd->vld[i].sc,
sc_mtu_to_threshold(dd->vld[15].sc,
sc_mtu_to_threshold(dd->kernel_send_context[scontext],
sc_mtu_to_threshold(sc, hfi1_max_mtu,
u32 sc_mtu_to_threshold(struct send_context *sc, u32 mtu, u32 hdrqentsize);