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, 175 insertions, 0 deletions

diff --git a/kernel/net/ax25/ax25_std_timer.c b/kernel/net/ax25/ax25_std_timer.c
new file mode 100644
index 000000000..004467c9e
--- /dev/null
+++ b/kernel/net/ax25/ax25_std_timer.c
@@ -0,0 +1,175 @@
+/*
+ * 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
+ * (at your option) any later version.
+ *
+ * Copyright (C) Alan Cox GW4PTS (alan@lxorguk.ukuu.org.uk)
+ * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
+ * Copyright (C) Joerg Reuter DL1BKE (jreuter@yaina.de)
+ * Copyright (C) Frederic Rible F1OAT (frible@teaser.fr)
+ */
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/kernel.h>
+#include <linux/timer.h>
+#include <linux/string.h>
+#include <linux/sockios.h>
+#include <linux/net.h>
+#include <net/ax25.h>
+#include <linux/inet.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <net/sock.h>
+#include <net/tcp_states.h>
+#include <asm/uaccess.h>
+#include <linux/fcntl.h>
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+
+void ax25_std_heartbeat_expiry(ax25_cb *ax25)
+{
+	struct sock *sk = ax25->sk;
+
+	if (sk)
+		bh_lock_sock(sk);
+
+	switch (ax25->state) {
+	case AX25_STATE_0:
+		/* Magic here: If we listen() and a new link dies before it
+		   is accepted() it isn't 'dead' so doesn't get removed. */
+		if (!sk || sock_flag(sk, SOCK_DESTROY) ||
+		    (sk->sk_state == TCP_LISTEN &&
+		     sock_flag(sk, SOCK_DEAD))) {
+			if (sk) {
+				sock_hold(sk);
+				ax25_destroy_socket(ax25);
+				bh_unlock_sock(sk);
+				sock_put(sk);
+			} else
+				ax25_destroy_socket(ax25);
+			return;
+		}
+		break;
+
+	case AX25_STATE_3:
+	case AX25_STATE_4:
+		/*
+		 * Check the state of the receive buffer.
+		 */
+		if (sk != NULL) {
+			if (atomic_read(&sk->sk_rmem_alloc) <
+			    (sk->sk_rcvbuf >> 1) &&
+			    (ax25->condition & AX25_COND_OWN_RX_BUSY)) {
+				ax25->condition &= ~AX25_COND_OWN_RX_BUSY;
+				ax25->condition &= ~AX25_COND_ACK_PENDING;
+				ax25_send_control(ax25, AX25_RR, AX25_POLLOFF, AX25_RESPONSE);
+				break;
+			}
+		}
+	}
+
+	if (sk)
+		bh_unlock_sock(sk);
+
+	ax25_start_heartbeat(ax25);
+}
+
+void ax25_std_t2timer_expiry(ax25_cb *ax25)
+{
+	if (ax25->condition & AX25_COND_ACK_PENDING) {
+		ax25->condition &= ~AX25_COND_ACK_PENDING;
+		ax25_std_timeout_response(ax25);
+	}
+}
+
+void ax25_std_t3timer_expiry(ax25_cb *ax25)
+{
+	ax25->n2count = 0;
+	ax25_std_transmit_enquiry(ax25);
+	ax25->state   = AX25_STATE_4;
+}
+
+void ax25_std_idletimer_expiry(ax25_cb *ax25)
+{
+	ax25_clear_queues(ax25);
+
+	ax25->n2count = 0;
+	ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
+	ax25->state   = AX25_STATE_2;
+
+	ax25_calculate_t1(ax25);
+	ax25_start_t1timer(ax25);
+	ax25_stop_t2timer(ax25);
+	ax25_stop_t3timer(ax25);
+
+	if (ax25->sk != NULL) {
+		bh_lock_sock(ax25->sk);
+		ax25->sk->sk_state     = TCP_CLOSE;
+		ax25->sk->sk_err       = 0;
+		ax25->sk->sk_shutdown |= SEND_SHUTDOWN;
+		if (!sock_flag(ax25->sk, SOCK_DEAD)) {
+			ax25->sk->sk_state_change(ax25->sk);
+			sock_set_flag(ax25->sk, SOCK_DEAD);
+		}
+		bh_unlock_sock(ax25->sk);
+	}
+}
+
+void ax25_std_t1timer_expiry(ax25_cb *ax25)
+{
+	switch (ax25->state) {
+	case AX25_STATE_1:
+		if (ax25->n2count == ax25->n2) {
+			if (ax25->modulus == AX25_MODULUS) {
+				ax25_disconnect(ax25, ETIMEDOUT);
+				return;
+			} else {
+				ax25->modulus = AX25_MODULUS;
+				ax25->window  = ax25->ax25_dev->values[AX25_VALUES_WINDOW];
+				ax25->n2count = 0;
+				ax25_send_control(ax25, AX25_SABM, AX25_POLLON, AX25_COMMAND);
+			}
+		} else {
+			ax25->n2count++;
+			if (ax25->modulus == AX25_MODULUS)
+				ax25_send_control(ax25, AX25_SABM, AX25_POLLON, AX25_COMMAND);
+			else
+				ax25_send_control(ax25, AX25_SABME, AX25_POLLON, AX25_COMMAND);
+		}
+		break;
+
+	case AX25_STATE_2:
+		if (ax25->n2count == ax25->n2) {
+			ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
+			ax25_disconnect(ax25, ETIMEDOUT);
+			return;
+		} else {
+			ax25->n2count++;
+			ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
+		}
+		break;
+
+	case AX25_STATE_3:
+		ax25->n2count = 1;
+		ax25_std_transmit_enquiry(ax25);
+		ax25->state   = AX25_STATE_4;
+		break;
+
+	case AX25_STATE_4:
+		if (ax25->n2count == ax25->n2) {
+			ax25_send_control(ax25, AX25_DM, AX25_POLLON, AX25_RESPONSE);
+			ax25_disconnect(ax25, ETIMEDOUT);
+			return;
+		} else {
+			ax25->n2count++;
+			ax25_std_transmit_enquiry(ax25);
+		}
+		break;
+	}
+
+	ax25_calculate_t1(ax25);
+	ax25_start_t1timer(ax25);
+}