mac_mtu_req_t
mac_mtu_req_t *prev, *cur;
cur = kmem_alloc(sizeof (mac_mtu_req_t), KM_SLEEP);
mac_mtu_req_t *cur, *prev;
kmem_free(cur, sizeof (mac_mtu_req_t));
mac_mtu_req_t *mi_mtrp;
mac_mtu_req_t *mtr_nextp;