1 files changed, 78 insertions, 0 deletions
diff --git a/sys/dev/netmap/netmap_mbq.h b/sys/dev/netmap/netmap_mbq.h
new file mode 100644
index 0000000..d273d8a
--- /dev/null
+++ b/sys/dev/netmap/netmap_mbq.h
@@ -0,0 +1,78 @@
+/*
+ * Copyright (C) 2013-2014 Vincenzo Maffione. 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. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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 __NETMAP_MBQ_H__
+#define __NETMAP_MBQ_H__
+
+/*
+ * These function implement an mbuf tailq with an optional lock.
+ * The base functions act ONLY ON THE QUEUE, whereas the "safe"
+ * variants (mbq_safe_*) also handle the lock.
+ */
+
+/* XXX probably rely on a previous definition of SPINLOCK_T */
+#ifdef linux
+#define SPINLOCK_T  safe_spinlock_t
+#else
+#define SPINLOCK_T  struct mtx
+#endif
+
+/* A FIFO queue of mbufs with an optional lock. */
+struct mbq {
+    struct mbuf *head;
+    struct mbuf *tail;
+    int count;
+    SPINLOCK_T lock;
+};
+
+/* XXX "destroy" does not match "init" as a name.
+ * We should also clarify whether init can be used while
+ * holding a lock, and whether mbq_safe_destroy() is a NOP.
+ */
+void mbq_init(struct mbq *q);
+void mbq_destroy(struct mbq *q);
+void mbq_enqueue(struct mbq *q, struct mbuf *m);
+struct mbuf *mbq_dequeue(struct mbq *q);
+void mbq_purge(struct mbq *q);
+
+/* XXX missing mbq_lock() and mbq_unlock */
+
+void mbq_safe_init(struct mbq *q);
+void mbq_safe_destroy(struct mbq *q);
+void mbq_safe_enqueue(struct mbq *q, struct mbuf *m);
+struct mbuf *mbq_safe_dequeue(struct mbq *q);
+void mbq_safe_purge(struct mbq *q);
+
+static inline unsigned int mbq_len(struct mbq *q)
+{
+    return q->count;
+}
+
+#endif /* __NETMAP_MBQ_H_ */