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Re: [lwip-users] Behavior of netif_set_link_down
From: |
Richner Simon |
Subject: |
Re: [lwip-users] Behavior of netif_set_link_down |
Date: |
Wed, 1 May 2013 11:31:03 +0200 |
Thanks for your help guys
@ Marshall: Yes, you can check "NETIF_FLAG_LINK_UP", but this won't stop LwIP
from sending, as <ip_route> checks "NETIF_FLAG_UP". So you must have a second
mechanisme for this like Nikolas suggests...
@ Nikolas: So if I get you right, you would not activly stop the application
from sending, but just return "ERR_CONN" in my driver send routine if the
connection was down?
Regards
Simon
-----Ursprüngliche Nachricht-----
Von: address@hidden [mailto:address@hidden Im Auftrag von Marshall Brown
Gesendet: Mittwoch, 1. Mai 2013 11:12
An: Mailing list for lwIP users
Betreff: Re: [lwip-users] Behavior of netif_set_link_down
Here's how I do mine
/* Call the PHY status update state machine once in a while
to keep the link status up-to-date */
if (lpc_phy_sts_sm(netif_eth0) != 0) {
/* Set the state of the LED to on if the ethernet link
is
active or off is disconnected. */
if (netif_eth0->flags & NETIF_FLAG_LINK_UP){
rtu_led_RequestLEDColour(LED_ALARM_PRIORITY_8,
ALARM_CLEAR); //request a low level alarm for ethernet not connected we should
be able to run without it
}
else{
rtu_led_RequestLEDColour(LED_ALARM_PRIORITY_8,
ALARM_SET); //request a low level alarm for ethernet not connected we
should be able to run without it
}
}
Courtesy of the internet somewhere
Regards
Marshall
-----Original Message-----
From: address@hidden [mailto:address@hidden On Behalf Of Nikolas Karakotas
Sent: Wednesday, 1 May 2013 9:02 p.m.
To: Mailing list for lwIP users
Subject: Re: [lwip-users] Behavior of netif_set_link_down
I believe it has to do with your ethernet driver and how it is implemented.
Even if you send data to your hardware you should control this with a
incrementer for example just like a round robin.
Regards,
Nick
-----Original Message-----
From: Richner Simon
Sent: Wednesday, May 01, 2013 6:18 PM
To: Mailing list for lwIP users
Subject: [lwip-users] Behavior of netif_set_link_down
Hi,
In my driver I call <netif_set_link_up> and <netif_set_link_down> when I detect
that a cable was connected to / removed from my device. However, I noticed,
that only setting the link up triggers <dhcp_network_changed> and not setting
link down. So when a cable gets removed, the NETIF_FLAG_UP stays true.
In my application, I send some data periodically to a predefined IP.
When now the cable gets disconnected, the application doesn't get informed
about this, neighter gets the netif set down. So my application continues to
spam my hardware and sooner or later I get a buffer overflow on my hardware!
=> What is calling <netif_set_link_down> good for, when it doesn't bring the
interface down?
=> What would be the best way to tell my application to stop streaming?
Best Regards
Simon
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