Add the rt linux 4.1.3-rt3 as base

Import the rt linux 4.1.3-rt3 as OPNFV kvm base.

It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:

commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date:   Sat Jul 25 12:13:34 2015 +0200

    Prepare v4.1.3-rt3

    Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.

Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>

1 files changed, 122 insertions, 0 deletions

diff --git a/kernel/include/net/dn_route.h b/kernel/include/net/dn_route.h
new file mode 100644
index 000000000..55df9939b
--- /dev/null
+++ b/kernel/include/net/dn_route.h
@@ -0,0 +1,122 @@
+#ifndef _NET_DN_ROUTE_H
+#define _NET_DN_ROUTE_H
+
+/******************************************************************************
+    (c) 1995-1998 E.M. Serrat		emserrat@geocities.com
+    
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+*******************************************************************************/
+
+struct sk_buff *dn_alloc_skb(struct sock *sk, int size, gfp_t pri);
+int dn_route_output_sock(struct dst_entry __rcu **pprt, struct flowidn *,
+			 struct sock *sk, int flags);
+int dn_cache_dump(struct sk_buff *skb, struct netlink_callback *cb);
+void dn_rt_cache_flush(int delay);
+int dn_route_rcv(struct sk_buff *skb, struct net_device *dev,
+		 struct packet_type *pt, struct net_device *orig_dev);
+
+/* Masks for flags field */
+#define DN_RT_F_PID 0x07 /* Mask for packet type                      */
+#define DN_RT_F_PF  0x80 /* Padding Follows                           */
+#define DN_RT_F_VER 0x40 /* Version =0 discard packet if ==1          */
+#define DN_RT_F_IE  0x20 /* Intra Ethernet, Reserved in short pkt     */
+#define DN_RT_F_RTS 0x10 /* Packet is being returned to sender        */
+#define DN_RT_F_RQR 0x08 /* Return packet to sender upon non-delivery */
+
+/* Mask for types of routing packets */
+#define DN_RT_PKT_MSK   0x06
+/* Types of routing packets */
+#define DN_RT_PKT_SHORT 0x02 /* Short routing packet */
+#define DN_RT_PKT_LONG  0x06 /* Long routing packet  */
+
+/* Mask for control/routing selection */
+#define DN_RT_PKT_CNTL  0x01 /* Set to 1 if a control packet  */
+/* Types of control packets */
+#define DN_RT_CNTL_MSK  0x0f /* Mask for control packets      */
+#define DN_RT_PKT_INIT  0x01 /* Initialisation packet         */
+#define DN_RT_PKT_VERI  0x03 /* Verification Message          */
+#define DN_RT_PKT_HELO  0x05 /* Hello and Test Message        */
+#define DN_RT_PKT_L1RT  0x07 /* Level 1 Routing Message       */
+#define DN_RT_PKT_L2RT  0x09 /* Level 2 Routing Message       */
+#define DN_RT_PKT_ERTH  0x0b /* Ethernet Router Hello         */
+#define DN_RT_PKT_EEDH  0x0d /* Ethernet EndNode Hello        */
+
+/* Values for info field in hello message */
+#define DN_RT_INFO_TYPE 0x03 /* Type mask                     */
+#define DN_RT_INFO_L1RT 0x02 /* L1 Router                     */
+#define DN_RT_INFO_L2RT 0x01 /* L2 Router                     */
+#define DN_RT_INFO_ENDN 0x03 /* EndNode                       */
+#define DN_RT_INFO_VERI 0x04 /* Verification Reqd.            */
+#define DN_RT_INFO_RJCT 0x08 /* Reject Flag, Reserved         */
+#define DN_RT_INFO_VFLD 0x10 /* Verification Failed, Reserved */
+#define DN_RT_INFO_NOML 0x20 /* No Multicast traffic accepted */
+#define DN_RT_INFO_BLKR 0x40 /* Blocking Requested            */
+
+/*
+ * The fl structure is what we used to look up the route.
+ * The rt_saddr & rt_daddr entries are the same as key.saddr & key.daddr
+ * except for local input routes, where the rt_saddr = fl.fld_dst and
+ * rt_daddr = fl.fld_src to allow the route to be used for returning
+ * packets to the originating host.
+ */
+struct dn_route {
+	struct dst_entry dst;
+
+	struct neighbour *n;
+
+	struct flowidn fld;
+
+	__le16 rt_saddr;
+	__le16 rt_daddr;
+	__le16 rt_gateway;
+	__le16 rt_local_src;	/* Source used for forwarding packets */
+	__le16 rt_src_map;
+	__le16 rt_dst_map;
+
+	unsigned int rt_flags;
+	unsigned int rt_type;
+};
+
+static inline bool dn_is_input_route(struct dn_route *rt)
+{
+	return rt->fld.flowidn_iif != 0;
+}
+
+static inline bool dn_is_output_route(struct dn_route *rt)
+{
+	return rt->fld.flowidn_iif == 0;
+}
+
+void dn_route_init(void);
+void dn_route_cleanup(void);
+
+#include <net/sock.h>
+#include <linux/if_arp.h>
+
+static inline void dn_rt_send(struct sk_buff *skb)
+{
+	dev_queue_xmit(skb);
+}
+
+static inline void dn_rt_finish_output(struct sk_buff *skb, char *dst, char *src)
+{
+	struct net_device *dev = skb->dev;
+
+	if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK))
+		dst = NULL;
+
+	if (dev_hard_header(skb, dev, ETH_P_DNA_RT, dst, src, skb->len) >= 0)
+		dn_rt_send(skb);
+	else
+		kfree_skb(skb);
+}
+
+#endif /* _NET_DN_ROUTE_H */