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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /net/lapb/lapb_timer.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'net/lapb/lapb_timer.c')
-rw-r--r--net/lapb/lapb_timer.c189
1 files changed, 189 insertions, 0 deletions
diff --git a/net/lapb/lapb_timer.c b/net/lapb/lapb_timer.c
new file mode 100644
index 000000000000..2c8f0f809220
--- /dev/null
+++ b/net/lapb/lapb_timer.c
@@ -0,0 +1,189 @@
+/*
+ * LAPB release 002
+ *
+ * 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
+ * LAPB 002 Jonathan Naylor New timer architecture.
+ */
+
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/kernel.h>
+#include <linux/jiffies.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_t1timer_expiry(unsigned long);
+static void lapb_t2timer_expiry(unsigned long);
+
+void lapb_start_t1timer(struct lapb_cb *lapb)
+{
+ del_timer(&lapb->t1timer);
+
+ lapb->t1timer.data = (unsigned long)lapb;
+ lapb->t1timer.function = &lapb_t1timer_expiry;
+ lapb->t1timer.expires = jiffies + lapb->t1;
+
+ add_timer(&lapb->t1timer);
+}
+
+void lapb_start_t2timer(struct lapb_cb *lapb)
+{
+ del_timer(&lapb->t2timer);
+
+ lapb->t2timer.data = (unsigned long)lapb;
+ lapb->t2timer.function = &lapb_t2timer_expiry;
+ lapb->t2timer.expires = jiffies + lapb->t2;
+
+ add_timer(&lapb->t2timer);
+}
+
+void lapb_stop_t1timer(struct lapb_cb *lapb)
+{
+ del_timer(&lapb->t1timer);
+}
+
+void lapb_stop_t2timer(struct lapb_cb *lapb)
+{
+ del_timer(&lapb->t2timer);
+}
+
+int lapb_t1timer_running(struct lapb_cb *lapb)
+{
+ return timer_pending(&lapb->t1timer);
+}
+
+static void lapb_t2timer_expiry(unsigned long param)
+{
+ struct lapb_cb *lapb = (struct lapb_cb *)param;
+
+ if (lapb->condition & LAPB_ACK_PENDING_CONDITION) {
+ lapb->condition &= ~LAPB_ACK_PENDING_CONDITION;
+ lapb_timeout_response(lapb);
+ }
+}
+
+static void lapb_t1timer_expiry(unsigned long param)
+{
+ struct lapb_cb *lapb = (struct lapb_cb *)param;
+
+ 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_disconnect_indication(lapb, LAPB_TIMEDOUT);
+#if LAPB_DEBUG > 0
+ printk(KERN_DEBUG "lapb: (%p) S1 -> S0\n", lapb->dev);
+#endif
+ return;
+ } else {
+ lapb->n2count++;
+ if (lapb->mode & LAPB_EXTENDED) {
+#if LAPB_DEBUG > 1
+ printk(KERN_DEBUG "lapb: (%p) S1 TX SABME(1)\n", lapb->dev);
+#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->dev);
+#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_disconnect_confirmation(lapb, LAPB_TIMEDOUT);
+#if LAPB_DEBUG > 0
+ printk(KERN_DEBUG "lapb: (%p) S2 -> S0\n", lapb->dev);
+#endif
+ return;
+ } else {
+ lapb->n2count++;
+#if LAPB_DEBUG > 1
+ printk(KERN_DEBUG "lapb: (%p) S2 TX DISC(1)\n", lapb->dev);
+#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_stop_t2timer(lapb);
+ lapb_disconnect_indication(lapb, LAPB_TIMEDOUT);
+#if LAPB_DEBUG > 0
+ printk(KERN_DEBUG "lapb: (%p) S3 -> S0\n", lapb->dev);
+#endif
+ return;
+ } 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_disconnect_indication(lapb, LAPB_TIMEDOUT);
+#if LAPB_DEBUG > 0
+ printk(KERN_DEBUG "lapb: (%p) S4 -> S0\n", lapb->dev);
+#endif
+ return;
+ } else {
+ lapb->n2count++;
+ lapb_transmit_frmr(lapb);
+ }
+ break;
+ }
+
+ lapb_start_t1timer(lapb);
+}

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