linux-imx

/*

 *  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/timer.h>

#include <linux/string.h>

#include <linux/sockios.h>

#include <linux/net.h>

#include <linux/inet.h>

#include <linux/skbuff.h>

#include <linux/slab.h>

#include <net/sock.h>

#include <linux/uaccess.h>

#include <linux/fcntl.h>

#include <linux/mm.h>

#include <linux/interrupt.h>

#include <net/lapb.h>

​

/*

 *  This procedure is passed a buffer descriptor for an iframe. It builds

 *  the rest of the control part of the frame and then writes it out.

 */

static void lapb_send_iframe(struct lapb_cb *lapb, struct sk_buff *skb, int poll_bit)

{

    unsigned char *frame;

​

    if (!skb)

        return;

​

    if (lapb->mode & LAPB_EXTENDED) {

        frame = skb_push(skb, 2);

​

        frame[0] = LAPB_I;

        frame[0] |= lapb->vs << 1;

        frame[1] = poll_bit ? LAPB_EPF : 0;

        frame[1] |= lapb->vr << 1;

    } else {

        frame = skb_push(skb, 1);

​

        *frame = LAPB_I;

        *frame |= poll_bit ? LAPB_SPF : 0;

        *frame |= lapb->vr << 5;

        *frame |= lapb->vs << 1;

    }