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[netdevice] Add a generic concept of a "blocked link"

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When Spanning Tree Protocol (STP) is used, there may be a substantial
delay (tens of seconds) from the time that the link goes up to the
time that the port starts forwarding packets.

Add a generic concept of a "blocked link" (i.e. a link which is up but
which is not expected to communicate successfully), and allow "ifstat"
to indicate when a link is blocked.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2015-06-25 16:41:39 +01:00
parent 7e7870984b
commit f3812395a2
3 changed files with 70 additions and 2 deletions
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src/usr/ifmgmt.c
+2 -1
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@@ -103,11 +103,12 @@ static void ifstat_errors ( struct net_device_stats *stats,
*/
void ifstat ( struct net_device *netdev ) {
printf ( "%s: %s using %s on %s (%s)\n"
" [Link:%s, TX:%d TXE:%d RX:%d RXE:%d]\n",
" [Link:%s%s, TX:%d TXE:%d RX:%d RXE:%d]\n",
netdev->name, netdev_addr ( netdev ),
netdev->dev->driver_name, netdev->dev->name,
( netdev_is_open ( netdev ) ? "open" : "closed" ),
( netdev_link_ok ( netdev ) ? "up" : "down" ),
( netdev_link_blocked ( netdev ) ? " (blocked)" : "" ),
netdev->tx_stats.good, netdev->tx_stats.bad,
netdev->rx_stats.good, netdev->rx_stats.bad );
if ( ! netdev_link_ok ( netdev ) ) {