Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / net / lapb / lapb_timer.c

diff --git a/kernel/net/lapb/lapb_timer.c b/kernel/net/lapb/lapb_timer.c
new file mode 100644 (file)
index 0000000..355cc3b
--- /dev/null
+++ b/kernel/net/lapb/lapb_timer.c
@@ -0,0 +1,179 @@
+/*
+ *     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.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#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 <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);
+                               lapb_dbg(0, "(%p) S1 -> S0\n", lapb->dev);
+                               return;
+                       } else {
+                               lapb->n2count++;
+                               if (lapb->mode & LAPB_EXTENDED) {
+                                       lapb_dbg(1, "(%p) S1 TX SABME(1)\n",
+                                                lapb->dev);
+                                       lapb_send_control(lapb, LAPB_SABME, LAPB_POLLON, LAPB_COMMAND);
+                               } else {
+                                       lapb_dbg(1, "(%p) S1 TX SABM(1)\n",
+                                                lapb->dev);
+                                       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);
+                               lapb_dbg(0, "(%p) S2 -> S0\n", lapb->dev);
+                               return;
+                       } else {
+                               lapb->n2count++;
+                               lapb_dbg(1, "(%p) S2 TX DISC(1)\n", lapb->dev);
+                               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);
+                               lapb_dbg(0, "(%p) S3 -> S0\n", lapb->dev);
+                               return;
+                       } else {
+                               lapb->n2count++;
+                               lapb_requeue_frames(lapb);
+                               lapb_kick(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);
+                               lapb_dbg(0, "(%p) S4 -> S0\n", lapb->dev);
+                               return;
+                       } else {
+                               lapb->n2count++;
+                               lapb_transmit_frmr(lapb);
+                       }
+                       break;
+       }
+
+       lapb_start_t1timer(lapb);
+}