set_hwid
set_hwid(md2, hwid);
set_hwid(&md->u.md2, nla_get_u8(attr));
set_hwid(&opts->u.erspan.u.md2, hwid);
set_hwid(&md->u.md2, nla_get_u8(nla));
set_hwid(&md->u.md2, 0xff);
set_hwid(&md->u.md2, nla_get_u8(nla));