MYX_RXSMALL_SIZE
mc.mc_data0 = htobe32(MYX_RXSMALL_SIZE - ETHER_ALIGN);
ring = (len <= (MYX_RXSMALL_SIZE - ETHER_ALIGN)) ?
m = MCLGETL(NULL, M_DONTWAIT, MYX_RXSMALL_SIZE);
m->m_len = m->m_pkthdr.len = MYX_RXSMALL_SIZE;
ifr[0].ifr_size = MYX_RXSMALL_SIZE;