MAX_QUEUED_PKT
if (serial->q_list.ml_len < MAX_QUEUED_PKT) {
if (parallel->r_tail - parallel->r_head < MAX_QUEUED_PKT) {
if (serial->q_list.ml_len < MAX_QUEUED_PKT) {
if (parallel->r_tail - parallel->r_head < MAX_QUEUED_PKT) {
struct mbuf *r_buf[MAX_QUEUED_PKT];
#define MAX_QUEUED_PKT_MASK (MAX_QUEUED_PKT - 1)