Mandeep Sandhu wrote:
On Wed, Sep 2, 2009 at 11:45 AM, Mandeep
Sandhu<[email protected]> wrote:
You need to wait for cyg_lwip_sequential_init() to return before creating
user threads.
That should be happening since I'm calling cyg_lwip_sequential_init() before
even creating my own thread!
<snip>
cyg_lwip_sequential_init();
cyg_lwip_thread_new( "My thread", m_main, (void *)"My thread",
my_stack, 0x1000, 5 );
...
...
<snip>
I'll enable more debugs to see where it's getting stuck.
Hi Simon,
I think I've partially fixed the issue. While going through the default config
I noticed that the TCPIP thread's default priority is set to 8. Which was lower
than my threads prio - 5.
After changing it to 2, it's able to find the interface (et0) with all
the right settings.
Well, that does not really make sense. cyg_lwip_sequential_init() will
not return until the lwip stack is initialized, and initializing
ethernet device drivers is part of that. This *must* work even when the
TCPIP thread has lower priority, as long as you start your application
thread *after* the execution of cyg_lwip_sequential_init(). By starting
*after* I mean that you also have to make sure that
cyg_lwip_sequential_init() and starting your applications thread is done
in the same thread!
I hope I didn't miss the obvious here, but that's how it should work.
Now another problem has cropped up! :) Sorry.
My app's actually a DHCP server. So it receives DHCP packets with 0.0.0.0
as the src IP. However, the stack is dropping them with the following message:
ip_input: iphdr->dest 0xffffffff netif->ip_addr 0x101010b (0xffffff,
0x1010b, 0xff000000)
ip_input: packet accepted on interface et
ip_input: packet source is not valid.
I've enabled the following in my config:
* Support broadcast filter
* Receive support
Is anything else needed?
May I ask you to forward this question to the lwip mailing list, I have
no experience on that subject myself.
Just one more thing:
While tracing the path from cyg_lwip_sequential_init() to see what
all happens, I saw that
we end up calling lwip_init() twice!
Once in cyg_lwip_sequential_init() and then again in tcpip_init().
Why do we do it twice? The only function called between these 2 calls is
cyg_semaphore_init().
I think we can remove one of these. Or am I missing something?
Well, that's a bug. Thanks for spotting. I wrapped a new release you can
download from:
http://download.westlicht.ch/lwip-20090902.tar.gz
Simon
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