Import of Linux/MIPS 2.1.36

1 files changed, 208 insertions, 0 deletions

diff --git a/net/lapb/lapb_timer.c b/net/lapb/lapb_timer.c
new file mode 100644
index 000000000..2679ff514
--- /dev/null
+++ b/net/lapb/lapb_timer.c
@@ -0,0 +1,208 @@
+/*
+ *	LAPB release 001
+ *
+ *	This is ALPHA test software. This code may break your machine, randomly fail to work with new 
+ *	releases, misbehave and/or generally screw up. It might even work. 
+ *
+ *	This code REQUIRES 2.1.15 or higher/ NET3.038
+ *
+ *	This module:
+ *		This module 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.
+ *
+ *	History
+ *	LAPB 001	Jonathan Naylor	Started Coding
+ */
+
+#include <linux/config.h>
+#if defined(CONFIG_LAPB) || defined(CONFIG_LAPB_MODULE)
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/timer.h>
+#include <linux/string.h>
+#include <linux/sockios.h>
+#include <linux/net.h>
+#include <linux/inet.h>
+#include <linux/skbuff.h>
+#include <net/sock.h>
+#include <asm/uaccess.h>
+#include <asm/system.h>
+#include <linux/fcntl.h>
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+#include <net/lapb.h>
+
+static void lapb_timer(unsigned long);
+
+/*
+ *	Linux set timer
+ */
+void lapb_set_timer(lapb_cb *lapb)
+{
+	unsigned long flags;	
+
+	save_flags(flags); cli();
+	del_timer(&lapb->timer);
+	restore_flags(flags);
+
+	lapb->timer.data     = (unsigned long)lapb;
+	lapb->timer.function = &lapb_timer;
+	lapb->timer.expires  = jiffies + (HZ / 10);
+
+	add_timer(&lapb->timer);
+}
+
+/*
+ *	LAPB TIMER 
+ *
+ *	This routine is called every 100ms. Decrement timer by this
+ *	amount - if expired then process the event.
+ */
+static void lapb_timer(unsigned long param)
+{
+	lapb_cb *lapb = (lapb_cb *)param;
+	struct sk_buff *skb;
+
+	/*
+	 *	Process all packet received since the last clock tick.
+	 */
+	while ((skb = skb_dequeue(&lapb->input_queue)) != NULL)
+		lapb_data_input(lapb, skb);
+
+	/*
+	 *	If in a data transfer state, transmit any data.
+	 */
+	if (lapb->state == LAPB_STATE_3)
+		lapb_kick(lapb);
+
+	/*
+	 *	T2 expiry code.
+	 */
+	if (lapb->t2timer > 0 && --lapb->t2timer == 0) {
+		if (lapb->state == LAPB_STATE_3) {
+			if (lapb->condition & LAPB_ACK_PENDING_CONDITION) {
+				lapb->condition &= ~LAPB_ACK_PENDING_CONDITION;
+				lapb_timeout_response(lapb);
+			}
+		}
+	}
+
+	/*
+	 *	If T1 isn't running, or hasn't timed out yet, keep going.
+	 */
+	if (lapb->t1timer == 0 || --lapb->t1timer > 0) {
+		lapb_set_timer(lapb);
+		return;
+	}
+
+	/*
+	 *	T1 has expired.
+	 */
+	switch (lapb->state) {
+
+		/*
+		 *	If we are a DCE, keep going DM .. DM .. DM
+		 */
+		case LAPB_STATE_0:
+			if (lapb->mode & LAPB_DCE)
+				lapb_send_control(lapb, LAPB_DM, LAPB_POLLOFF, LAPB_RESPONSE);
+			break;
+
+		/*
+		 *	Awaiting connection state, send SABM(E), up to N2 times.
+		 */
+		case LAPB_STATE_1: 
+			if (lapb->n2count == lapb->n2) {
+				lapb_clear_queues(lapb);
+				lapb->state   = LAPB_STATE_0;
+				lapb->t2timer = 0;
+				lapb_disconnect_indication(lapb, LAPB_TIMEDOUT);
+#if LAPB_DEBUG > 0
+				printk(KERN_DEBUG "lapb: (%p) S1 -> S0\n", lapb->token);
+#endif
+			} else {
+				lapb->n2count++;
+				if (lapb->mode & LAPB_EXTENDED) {
+#if LAPB_DEBUG > 1
+					printk(KERN_DEBUG "lapb: (%p) S1 TX SABME(1)\n", lapb->token);
+#endif
+					lapb_send_control(lapb, LAPB_SABME, LAPB_POLLON, LAPB_COMMAND);
+				} else {
+#if LAPB_DEBUG > 1
+					printk(KERN_DEBUG "lapb: (%p) S1 TX SABM(1)\n", lapb->token);
+#endif
+					lapb_send_control(lapb, LAPB_SABM, LAPB_POLLON, LAPB_COMMAND);
+				}
+			}
+			break;
+
+		/*
+		 *	Awaiting disconnection state, send DISC, up to N2 times.
+		 */
+		case LAPB_STATE_2:
+			if (lapb->n2count == lapb->n2) {
+				lapb_clear_queues(lapb);
+				lapb->state   = LAPB_STATE_0;
+				lapb->t2timer = 0;
+				lapb_disconnect_confirmation(lapb, LAPB_TIMEDOUT);
+#if LAPB_DEBUG > 0
+				printk(KERN_DEBUG "lapb: (%p) S2 -> S0\n", lapb->token);
+#endif
+			} else {
+				lapb->n2count++;
+#if LAPB_DEBUG > 1
+				printk(KERN_DEBUG "lapb: (%p) S2 TX DISC(1)\n", lapb->token);
+#endif
+				lapb_send_control(lapb, LAPB_DISC, LAPB_POLLON, LAPB_COMMAND);
+			}
+			break;
+
+		/*
+		 *	Data transfer state, restransmit I frames, up to N2 times.
+		 */
+		case LAPB_STATE_3:
+			if (lapb->n2count == lapb->n2) {
+				lapb_clear_queues(lapb);
+				lapb->state   = LAPB_STATE_0;
+				lapb->t2timer = 0;
+				lapb_disconnect_indication(lapb, LAPB_TIMEDOUT);
+#if LAPB_DEBUG > 0
+				printk(KERN_DEBUG "lapb: (%p) S3 -> S0\n", lapb->token);
+#endif
+			} else {
+				lapb->n2count++;
+				lapb_requeue_frames(lapb);
+			}
+			break;
+
+		/*
+		 *	Frame reject state, restransmit FRMR frames, up to N2 times.
+		 */
+		case LAPB_STATE_4:
+			if (lapb->n2count == lapb->n2) {
+				lapb_clear_queues(lapb);
+				lapb->state   = LAPB_STATE_0;
+				lapb->t2timer = 0;
+				lapb_disconnect_indication(lapb, LAPB_TIMEDOUT);
+#if LAPB_DEBUG > 0
+				printk(KERN_DEBUG "lapb: (%p) S4 -> S0\n", lapb->token);
+#endif
+			} else {
+				lapb->n2count++;
+				lapb_transmit_frmr(lapb);
+			}
+			break;
+	}
+
+	lapb->t1timer = lapb->t1;
+
+	lapb_set_timer(lapb);
+}
+
+#endif