380 	mac_register_t *mr;  in xnbu_attach()  local
394 	if ((mr = mac_alloc(MAC_VERSION)) == NULL) {  in xnbu_attach()
400 		mac_free(mr);  in xnbu_attach()
408 	mr->m_dip = dip;  in xnbu_attach()
409 	mr->m_driver = xnbp;  in xnbu_attach()
415 	mr->m_type_ident = MAC_PLUGIN_IDENT_ETHER;  in xnbu_attach()
416 	mr->m_src_addr = xnbp->xnb_mac_addr;  in xnbu_attach()
417 	mr->m_callbacks = &xnbu_callbacks;  in xnbu_attach()
418 	mr->m_min_sdu = 0;  in xnbu_attach()
419 	mr->m_max_sdu = XNBMAXPKT;  in xnbu_attach()
425 	mr->m_margin = PAGESIZE - XNBMAXPKT - sizeof (struct ether_header);  in xnbu_attach()
434 	err = mac_register(mr, &xnbup->u_mh);  in xnbu_attach()
435 	mac_free(mr);  in xnbu_attach()