Import of Linux/MIPS 2.1.36

1 files changed, 126 insertions, 0 deletions

diff --git a/include/net/dst.h b/include/net/dst.h
new file mode 100644
index 000000000..9d2a69100
--- /dev/null
+++ b/include/net/dst.h
@@ -0,0 +1,126 @@
+/*
+ * net/dst.h	Protocol independent destination cache definitions.
+ *
+ * Authors:	Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
+ *
+ */
+
+#ifndef _NET_DST_H
+#define _NET_DST_H
+
+#include <net/neighbour.h>
+
+/*
+ * 0 - no debugging messages
+ * 1 - rare events and bugs (default)
+ * 2 - trace mode.
+ */
+#ifdef  NO_ANK_FIX
+#define RT_CACHE_DEBUG		0
+#else
+#define RT_CACHE_DEBUG		1
+#endif
+
+#define DST_GC_MIN	(1*HZ)
+#define DST_GC_INC	(5*HZ)
+#define DST_GC_MAX	(120*HZ)
+
+struct sk_buff;
+
+struct dst_entry
+{
+	struct dst_entry        *next;
+	atomic_t		refcnt;		/* tree/hash references	*/
+	atomic_t		use;		/* client references	*/
+	struct device	        *dev;
+	char			obsolete;
+	char			priority;
+	char			__pad1, __pad2;
+	unsigned long		lastuse;
+	unsigned		window;
+	unsigned		pmtu;
+	unsigned		rtt;
+	int			error;
+
+	struct neighbour	*neighbour;
+	struct hh_cache		*hh;
+
+	int			(*input)(struct sk_buff*);
+	int			(*output)(struct sk_buff*);
+
+	struct  dst_ops	        *ops;
+	
+	char			info[0];
+};
+
+
+struct dst_ops
+{
+	unsigned short		family;
+	struct dst_entry *	(*check)(struct dst_entry *, u32 cookie);
+	struct dst_entry *	(*reroute)(struct dst_entry *,
+					   struct sk_buff *);
+	void			(*destroy)(struct dst_entry *);
+};
+
+extern struct dst_entry * dst_garbage_list;
+extern atomic_t	dst_total;
+
+static __inline__
+struct dst_entry * dst_clone(struct dst_entry * dst)
+{
+	if (dst)
+		atomic_inc(&dst->use);
+	return dst;
+}
+
+static __inline__
+void dst_release(struct dst_entry * dst)
+{
+	if (dst)
+		atomic_dec(&dst->use);
+}
+
+static __inline__
+struct dst_entry * dst_check(struct dst_entry ** dst_p, u32 cookie)
+{
+	struct dst_entry * dst = *dst_p;
+	if (dst && dst->obsolete)
+		dst = dst->ops->check(dst, cookie);
+	return (*dst_p = dst);
+}
+
+static __inline__
+struct dst_entry * dst_reroute(struct dst_entry ** dst_p, struct sk_buff *skb)
+{
+	struct dst_entry * dst = *dst_p;
+	if (dst && dst->obsolete)
+		dst = dst->ops->reroute(dst, skb);
+	return (*dst_p = dst);
+}
+
+static __inline__
+void dst_destroy(struct dst_entry * dst)
+{
+	if (dst->neighbour)
+		neigh_release(dst->neighbour);
+	if (dst->ops->destroy)
+		dst->ops->destroy(dst);
+	kfree(dst);
+	atomic_dec(&dst_total);
+}
+
+extern void * dst_alloc(int size, struct dst_ops * ops);
+extern void __dst_free(struct dst_entry * dst);
+
+static __inline__
+void dst_free(struct dst_entry * dst)
+{
+	if (!atomic_read(&dst->use)) {
+		dst_destroy(dst);
+		return;
+	}
+	__dst_free(dst);
+}
+
+#endif /* _NET_DST_H */