nomac_module.c

硬实时linux补丁rtai下的网络协议栈 最新

/***
 *
 *  rtmac/nomac/nomac_module.c
 *
 *  RTmac - real-time networking media access control subsystem
 *  Copyright (C) 2002       Marc Kleine-Budde <[e-mail]>,
 *                2003, 2004 Jan Kiszka <[e-mail]>
 *
 *  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.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */

#include <asm/semaphore.h>
#include <linux/init.h>
#include <linux/module.h>

#include <rtnet_sys.h>
#include <rtmac/rtmac_vnic.h>
#include <rtmac/nomac/nomac.h>
#include <rtmac/nomac/nomac_dev.h>
#include <rtmac/nomac/nomac_ioctl.h>
#include <rtmac/nomac/nomac_proto.h>


#ifdef CONFIG_PROC_FS
LIST_HEAD(nomac_devices);
DECLARE_MUTEX(nomac_nrt_lock);


int nomac_proc_read(char *buf, char **start, off_t offset, int count,
                    int *eof, void *data)
{
    struct nomac_priv *entry;
    RTNET_PROC_PRINT_VARS(80);


    down(&nomac_nrt_lock);

    if (!RTNET_PROC_PRINT("Interface       API Device      State\n"))
        goto done;

    list_for_each_entry(entry, &nomac_devices, list_entry) {
        if (!RTNET_PROC_PRINT("%-15s %-15s Attached\n", entry->rtdev->name,
                              entry->api_device.device_name))
            break;
    }

  done:
    up(&nomac_nrt_lock);

    RTNET_PROC_PRINT_DONE;
}
#endif /* CONFIG_PROC_FS */



int nomac_attach(struct rtnet_device *rtdev, void *priv)
{
    struct nomac_priv   *nomac = (struct nomac_priv *)priv;
    int                 ret;


    nomac->magic = NOMAC_MAGIC;
    nomac->rtdev = rtdev;

    /* ... */

    ret = nomac_dev_init(rtdev, nomac);
    if (ret < 0)
        return ret;

    RTNET_MOD_INC_USE_COUNT;

#ifdef CONFIG_PROC_FS
    down(&nomac_nrt_lock);
    list_add(&nomac->list_entry, &nomac_devices);
    up(&nomac_nrt_lock);
#endif /* CONFIG_PROC_FS */

    return 0;
}



int nomac_detach(struct rtnet_device *rtdev, void *priv)
{
    struct nomac_priv   *nomac = (struct nomac_priv *)priv;
    int                 ret;


    ret =  nomac_dev_release(nomac);
    if (ret < 0)
        return ret;

    /* ... */
    RTNET_MOD_DEC_USE_COUNT;

#ifdef CONFIG_PROC_FS
    down(&nomac_nrt_lock);
    list_del(&nomac->list_entry);
    up(&nomac_nrt_lock);
#endif /* CONFIG_PROC_FS */

    return 0;
}



#ifdef CONFIG_PROC_FS
struct rtmac_proc_entry nomac_proc_entries[] = {
    { name: "nomac", handler: nomac_proc_read },
    { name: NULL, handler: NULL }
};
#endif /* CONFIG_PROC_FS */

struct rtmac_disc nomac_disc = {
    name:           "NoMAC",
    priv_size:      sizeof(struct nomac_priv),
    disc_type:      __constant_htons(RTMAC_TYPE_NOMAC),

    packet_rx:      nomac_packet_rx,
    rt_packet_tx:   nomac_rt_packet_tx,
    nrt_packet_tx:  nomac_nrt_packet_tx,

    get_mtu:        NULL,

    vnic_xmit:      RTMAC_DEFAULT_VNIC,

    attach:         nomac_attach,
    detach:         nomac_detach,

    ioctls:         {
        service_name:   "RTmac/NoMAC",
        ioctl_type:     RTNET_IOC_TYPE_RTMAC_NOMAC,
        handler:        nomac_ioctl
    },

#ifdef CONFIG_PROC_FS
    proc_entries:   nomac_proc_entries
#endif /* CONFIG_PROC_FS */
};



int __init nomac_init(void)
{
    int ret;


    printk("RTmac/NoMAC: init void media access control mechanism\n");

    ret = nomac_proto_init();
    if (ret < 0)
        return ret;

    ret = rtmac_disc_register(&nomac_disc);
    if (ret < 0) {
        nomac_proto_cleanup();
        return ret;
    }

    return 0;
}



void nomac_release(void)
{
    rtmac_disc_deregister(&nomac_disc);
    nomac_proto_cleanup();

    printk("RTmac/NoMAC: unloaded\n");
}



module_init(nomac_init);
module_exit(nomac_release);

MODULE_AUTHOR("Jan Kiszka");
MODULE_LICENSE("GPL");