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, 204 insertions, 0 deletions

diff --git a/kernel/include/net/dn_nsp.h b/kernel/include/net/dn_nsp.h
new file mode 100644
index 000000000..3a3e33d18
--- /dev/null
+++ b/kernel/include/net/dn_nsp.h
@@ -0,0 +1,204 @@
+#ifndef _NET_DN_NSP_H
+#define _NET_DN_NSP_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.
+*******************************************************************************/
+/* dn_nsp.c functions prototyping */
+
+void dn_nsp_send_data_ack(struct sock *sk);
+void dn_nsp_send_oth_ack(struct sock *sk);
+void dn_nsp_delayed_ack(struct sock *sk);
+void dn_send_conn_ack(struct sock *sk);
+void dn_send_conn_conf(struct sock *sk, gfp_t gfp);
+void dn_nsp_send_disc(struct sock *sk, unsigned char type,
+		      unsigned short reason, gfp_t gfp);
+void dn_nsp_return_disc(struct sk_buff *skb, unsigned char type,
+			unsigned short reason);
+void dn_nsp_send_link(struct sock *sk, unsigned char lsflags, char fcval);
+void dn_nsp_send_conninit(struct sock *sk, unsigned char flags);
+
+void dn_nsp_output(struct sock *sk);
+int dn_nsp_check_xmit_queue(struct sock *sk, struct sk_buff *skb,
+			    struct sk_buff_head *q, unsigned short acknum);
+void dn_nsp_queue_xmit(struct sock *sk, struct sk_buff *skb, gfp_t gfp,
+		       int oob);
+unsigned long dn_nsp_persist(struct sock *sk);
+int dn_nsp_xmit_timeout(struct sock *sk);
+
+int dn_nsp_rx(struct sk_buff *);
+int dn_nsp_backlog_rcv(struct sock *sk, struct sk_buff *skb);
+
+struct sk_buff *dn_alloc_skb(struct sock *sk, int size, gfp_t pri);
+struct sk_buff *dn_alloc_send_skb(struct sock *sk, size_t *size, int noblock,
+				  long timeo, int *err);
+
+#define NSP_REASON_OK 0		/* No error */
+#define NSP_REASON_NR 1		/* No resources */
+#define NSP_REASON_UN 2		/* Unrecognised node name */
+#define NSP_REASON_SD 3		/* Node shutting down */
+#define NSP_REASON_ID 4		/* Invalid destination end user */
+#define NSP_REASON_ER 5		/* End user lacks resources */
+#define NSP_REASON_OB 6		/* Object too busy */
+#define NSP_REASON_US 7		/* Unspecified error */
+#define NSP_REASON_TP 8		/* Third-Party abort */
+#define NSP_REASON_EA 9		/* End user has aborted the link */
+#define NSP_REASON_IF 10	/* Invalid node name format */
+#define NSP_REASON_LS 11	/* Local node shutdown */
+#define NSP_REASON_LL 32	/* Node lacks logical-link resources */
+#define NSP_REASON_LE 33	/* End user lacks logical-link resources */
+#define NSP_REASON_UR 34	/* Unacceptable RQSTRID or PASSWORD field */
+#define NSP_REASON_UA 36	/* Unacceptable ACCOUNT field */
+#define NSP_REASON_TM 38	/* End user timed out logical link */
+#define NSP_REASON_NU 39	/* Node unreachable */
+#define NSP_REASON_NL 41	/* No-link message */
+#define NSP_REASON_DC 42	/* Disconnect confirm */
+#define NSP_REASON_IO 43	/* Image data field overflow */
+
+#define NSP_DISCINIT 0x38
+#define NSP_DISCCONF 0x48
+
+/*------------------------- NSP - messages ------------------------------*/
+/* Data Messages */
+/*---------------*/
+
+/* Data Messages    (data segment/interrupt/link service)               */
+
+struct nsp_data_seg_msg {
+	__u8   msgflg;
+	__le16 dstaddr;
+	__le16 srcaddr;
+} __packed;
+
+struct nsp_data_opt_msg {
+	__le16 acknum;
+	__le16 segnum;
+	__le16 lsflgs;
+} __packed;
+
+struct nsp_data_opt_msg1 {
+	__le16 acknum;
+	__le16 segnum;
+} __packed;
+
+
+/* Acknowledgment Message (data/other data)                             */
+struct nsp_data_ack_msg {
+	__u8   msgflg;
+	__le16 dstaddr;
+	__le16 srcaddr;
+	__le16 acknum;
+} __packed;
+
+/* Connect Acknowledgment Message */
+struct  nsp_conn_ack_msg {
+	__u8 msgflg;
+	__le16 dstaddr;
+} __packed;
+
+
+/* Connect Initiate/Retransmit Initiate/Connect Confirm */
+struct  nsp_conn_init_msg {
+	__u8   msgflg;
+#define NSP_CI      0x18            /* Connect Initiate     */
+#define NSP_RCI     0x68            /* Retrans. Conn Init   */
+	__le16 dstaddr;
+	__le16 srcaddr;
+	__u8   services;
+#define NSP_FC_NONE   0x00            /* Flow Control None    */
+#define NSP_FC_SRC    0x04            /* Seg Req. Count       */
+#define NSP_FC_SCMC   0x08            /* Sess. Control Mess   */
+#define NSP_FC_MASK   0x0c            /* FC type mask         */
+	__u8   info;
+	__le16 segsize;
+} __packed;
+
+/* Disconnect Initiate/Disconnect Confirm */
+struct  nsp_disconn_init_msg {
+	__u8   msgflg;
+	__le16 dstaddr;
+	__le16 srcaddr;
+	__le16 reason;
+} __packed;
+
+
+
+struct  srcobj_fmt {
+	__u8   format;
+	__u8   task;
+	__le16 grpcode;
+	__le16 usrcode;
+	__u8   dlen;
+} __packed;
+
+/*
+ * A collection of functions for manipulating the sequence
+ * numbers used in NSP. Similar in operation to the functions
+ * of the same name in TCP.
+ */
+static __inline__ int dn_before(__u16 seq1, __u16 seq2)
+{
+        seq1 &= 0x0fff;
+        seq2 &= 0x0fff;
+
+        return (int)((seq1 - seq2) & 0x0fff) > 2048;
+}
+
+
+static __inline__ int dn_after(__u16 seq1, __u16 seq2)
+{
+        seq1 &= 0x0fff;
+        seq2 &= 0x0fff;
+
+        return (int)((seq2 - seq1) & 0x0fff) > 2048;
+}
+
+static __inline__ int dn_equal(__u16 seq1, __u16 seq2)
+{
+        return ((seq1 ^ seq2) & 0x0fff) == 0;
+}
+
+static __inline__ int dn_before_or_equal(__u16 seq1, __u16 seq2)
+{
+	return (dn_before(seq1, seq2) || dn_equal(seq1, seq2));
+}
+
+static __inline__ void seq_add(__u16 *seq, __u16 off)
+{
+        (*seq) += off;
+        (*seq) &= 0x0fff;
+}
+
+static __inline__ int seq_next(__u16 seq1, __u16 seq2)
+{
+	return dn_equal(seq1 + 1, seq2);
+}
+
+/*
+ * Can we delay the ack ?
+ */
+static __inline__ int sendack(__u16 seq)
+{
+        return (int)((seq & 0x1000) ? 0 : 1);
+}
+
+/*
+ * Is socket congested ?
+ */
+static __inline__ int dn_congested(struct sock *sk)
+{
+        return atomic_read(&sk->sk_rmem_alloc) > (sk->sk_rcvbuf >> 1);
+}
+
+#define DN_MAX_NSP_DATA_HEADER (11)
+
+#endif /* _NET_DN_NSP_H */