1 files changed, 123 insertions, 0 deletions
diff --git a/sys/dev/xen/netfront/mbufq.h b/sys/dev/xen/netfront/mbufq.h
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+++ b/sys/dev/xen/netfront/mbufq.h
@@ -0,0 +1,123 @@
+/**************************************************************************
+
+Copyright (c) 2007, Chelsio Inc.
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+ 1. Redistributions of source code must retain the above copyright notice,
+    this list of conditions and the following disclaimer.
+
+ 2. Neither the name of the Chelsio Corporation nor the names of its
+    contributors may be used to endorse or promote products derived from
+    this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+
+$FreeBSD$
+
+***************************************************************************/
+
+#ifndef CXGB_MBUFQ_H_
+#define CXGB_MBUFQ_H_
+
+struct mbuf_head {
+	struct mbuf *head;
+	struct mbuf *tail;
+	uint32_t     qlen;
+	uint32_t     qsize;
+	struct mtx   lock;
+};
+
+static __inline void
+mbufq_init(struct mbuf_head *l)
+{
+	l->head = l->tail = NULL;
+	l->qlen = l->qsize = 0;
+}
+
+static __inline int
+mbufq_empty(struct mbuf_head *l)
+{
+	return (l->head == NULL);
+}
+
+static __inline int
+mbufq_len(struct mbuf_head *l)
+{
+	return (l->qlen);
+}
+
+static __inline int
+mbufq_size(struct mbuf_head *l)
+{
+	return (l->qsize);
+}
+
+static __inline int
+mbufq_head_size(struct mbuf_head *l)
+{
+	return (l->head ? l->head->m_pkthdr.len : 0);
+}
+
+static __inline void
+mbufq_tail(struct mbuf_head *l, struct mbuf *m)
+{
+	l->qlen++;
+	if (l->head == NULL)
+		l->head = m;
+	else
+		l->tail->m_nextpkt = m;
+	l->tail = m;
+	l->qsize += m->m_pkthdr.len;
+}
+
+static __inline struct mbuf *
+mbufq_dequeue(struct mbuf_head *l)
+{
+	struct mbuf *m;
+
+	m = l->head;
+	if (m) {
+		if (m == l->tail) 
+			l->head = l->tail = NULL;
+		else
+			l->head = m->m_nextpkt;
+		m->m_nextpkt = NULL;
+		l->qlen--;
+		l->qsize -= m->m_pkthdr.len;
+	}
+
+	return (m);
+}
+
+static __inline struct mbuf *
+mbufq_peek(struct mbuf_head *l)
+{
+	return (l->head);
+}
+
+static __inline void
+mbufq_append(struct mbuf_head *a, struct mbuf_head *b)
+{
+	if (a->tail) 
+		a->tail->m_nextpkt = b->head;
+	if (b->tail)
+		a->tail = b->tail;
+	a->qlen += b->qlen;
+	a->qsize += b->qsize;
+	
+	
+}
+#endif  /* CXGB_MBUFQ_H_ */