From mboxrd@z Thu Jan  1 00:00:00 1970
From: Grant Edwards <grante@visi.com>
To: ecos-discuss@sources.redhat.com
Subject: [ECOS] DHCP shuts down Ethernet device?
Date: Mon, 23 Apr 2001 10:38:00 -0000
Message-id: <20010423123926.A2035@visi.com>
X-SW-Source: 2001-04/msg00323.html

I just discovered that when the DHCP task fails to find a
server, it then shuts down the Ethernet driver using the code:

    // Shut down interface so it can be reinitialized
    ifr.ifr_flags &= ~(IFF_UP | IFF_RUNNING);
    if (ioctl(s, SIOCSIFFLAGS, &ifr)) { /* set ifnet flags */
        perror("SIOCSIFFLAGS down");   
        return false;
        }

This generates a call to the _stop() method in the Ethernet
driver.

I realise that if DHCP fails, the IP stack needs to be shut
down, but stopping the ethernet device entirely keeps non-IP
stuff from working.  Does the DHCP code assume that there are
no non-IP network protocols, or is the above supposed to shut
down only IP networking on the device?  The other drivers I've
looked at all seem to shut off the interface completely.

I think I'm going to have to either comment out the above call,
or make my Ethernet driver's _stop() method into a noop...

-- 
Grant Edwards
grante@visi.com