dl_xid_req_t
dl_xid_req_t *xid = (dl_xid_req_t *)mp->b_rptr;
if (MBLKL(mp) < sizeof (dl_xid_req_t) ||
dl_xid_req_t xid_req;
#define DL_XID_REQ_SIZE sizeof (dl_xid_req_t)