source: bootcd/isolinux/syslinux-6.03/gpxe/src/usr/ifmgmt.c

/*
 * Copyright (C) 2007 Michael Brown <mbrown@fensystems.co.uk>.
 *
 * 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 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.
 */

FILE_LICENCE ( GPL2_OR_LATER );

#include <string.h>
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <console.h>
#include <gpxe/netdevice.h>
#include <gpxe/device.h>
#include <gpxe/process.h>
#include <gpxe/keys.h>
#include <usr/ifmgmt.h>

/** @file
 *
 * Network interface management
 *
 */

/**
 * Open network device
 *
 * @v netdev            Network device
 * @ret rc              Return status code
 */
int ifopen ( struct net_device *netdev ) {
        int rc;

        if ( ( rc = netdev_open ( netdev ) ) != 0 ) {
                printf ( "Could not open %s: %s\n",
                         netdev->name, strerror ( rc ) );
                return rc;
        }

        return 0;
}

/**
 * Close network device
 *
 * @v netdev            Network device
 */
void ifclose ( struct net_device *netdev ) {
        netdev_close ( netdev );
}

/**
 * Print network device error breakdown
 *
 * @v stats             Network device statistics
 * @v prefix            Message prefix
 */
static void ifstat_errors ( struct net_device_stats *stats,
                            const char *prefix ) {
        unsigned int i;

        for ( i = 0 ; i < ( sizeof ( stats->errors ) /
                            sizeof ( stats->errors[0] ) ) ; i++ ) {
                if ( stats->errors[i].count )
                        printf ( "  [%s: %d x \"%s\"]\n", prefix,
                                 stats->errors[i].count,
                                 strerror ( stats->errors[i].rc ) );
        }
}

/**
 * Print status of network device
 *
 * @v netdev            Network device
 */
void ifstat ( struct net_device *netdev ) {
        printf ( "%s: %s on %s (%s)\n"
                 "  [Link:%s, TX:%d TXE:%d RX:%d RXE:%d]\n",
                 netdev->name, netdev_addr ( netdev ), netdev->dev->name,
                 ( ( netdev->state & NETDEV_OPEN ) ? "open" : "closed" ),
                 ( netdev_link_ok ( netdev ) ? "up" : "down" ),
                 netdev->tx_stats.good, netdev->tx_stats.bad,
                 netdev->rx_stats.good, netdev->rx_stats.bad );
        if ( ! netdev_link_ok ( netdev ) ) {
                printf ( "  [Link status: %s]\n",
                         strerror ( netdev->link_rc ) );
        }
        ifstat_errors ( &netdev->tx_stats, "TXE" );
        ifstat_errors ( &netdev->rx_stats, "RXE" );
}

/**
 * Wait for link-up, with status indication
 *
 * @v netdev            Network device
 * @v max_wait_ms       Maximum time to wait, in ms
 */
int iflinkwait ( struct net_device *netdev, unsigned int max_wait_ms ) {
        int key;
        int rc;

        if ( netdev_link_ok ( netdev ) )
                return 0;

        printf ( "Waiting for link-up on %s...", netdev->name );

        while ( 1 ) {
                if ( netdev_link_ok ( netdev ) ) {
                        rc = 0;
                        break;
                }
                if ( max_wait_ms-- == 0 ) {
                        rc = netdev->link_rc;
                        break;
                }
                step();
                if ( iskey() ) {
                        key = getchar();
                        if ( key == CTRL_C ) {
                                rc = -ECANCELED;
                                break;
                        }
                }
                mdelay ( 1 );
        }

        if ( rc == 0 ) {
                printf ( " ok\n" );
        } else {
                printf ( " failed: %s\n", strerror ( rc ) );
        }

        return rc;
}