196 #define	IF_QFULL(ifq)		((ifq)->ifq_len >= (ifq)->ifq_maxlen)  argument
197 #define	IF_DROP(ifq)		((ifq)->ifq_drops++)  argument
198 #define	IF_ENQUEUE(ifq, m) { \  argument
200 	if ((ifq)->ifq_tail == 0) \
201 		(ifq)->ifq_head = m; \
203 		(ifq)->ifq_tail->m_act = m; \
204 	(ifq)->ifq_tail = m; \
205 	(ifq)->ifq_len++; \
207 #define	IF_PREPEND(ifq, m) { \  argument
208 	(m)->m_act = (ifq)->ifq_head; \
209 	if ((ifq)->ifq_tail == 0) \
210 		(ifq)->ifq_tail = (m); \
211 	(ifq)->ifq_head = (m); \
212 	(ifq)->ifq_len++; \
230 #define	IF_DEQUEUEIF(ifq, m, ifp) { \  argument
231 	(m) = (ifq)->ifq_head; \
233 		if (((ifq)->ifq_head = (m)->m_act) == 0) \
234 			(ifq)->ifq_tail = 0; \
236 		(ifq)->ifq_len--; \
241 #define	IF_DEQUEUE(ifq, m) { \  argument
242 	(m) = (ifq)->ifq_head; \
244 		if (((ifq)->ifq_head = (m)->m_act) == 0) \
245 			(ifq)->ifq_tail = 0; \
247 		(ifq)->ifq_len--; \