Re: [ECOS] ecos with lwip and 2 interfaces

[Mandeep Sandhu <mandeepsandhu dot chd at gmail dot com>]

On Wed, Sep 23, 2009 at 6:18 PM, Simon Kallweit
<simon.kallweit@intefo.ch> wrote:
> Mandeep Sandhu wrote:
>>
>> You're right Simon. Enabling the second interface there made things
>> work (to some extent).
>>
>> However, I'm facing a new problem now.
>>
>> Previously I was using only a single interface (the Linux tap0
>> device). I have implemented a DHCP server which was working fine until
>> I enabled the SECOND INTERFACE.
>>
>> Now, my socket writes on the first interface (the tap0 interface) have
>> started failing! That is, without changing _any_ code! :( The return
>> value of sendto is coming as '-1' and the error string is set to 'No
>> error'. Actually this problem starts even if I don't enable support
>> for eth1 in the lwIP config. Just enabling the second interface under
>> "Common ethernet support -> Synthetic target ethernet driver" causes
>> this problem to surface.
>>
>> Any clues as to what could be going wrong?
>
> Well, this could be a problem because the default netif was set incorrectly.
> Only one netif can be the default netif. Currently the last initialized
> ethernet device would be set as default (incorrectly). I have changed that
> in the new version, also added 'Default netif' for loopif and slipif devices
> and also expanded configurability of ethernet netifs to 4 devices
> (previously 2). Now, only the selected netif should be the default netif.
> Please test with the new version and see if that helps:

Exactly my conclusion too!

In eth_drv_init() we are setting the netif as default without checking
conf->def!

I observed another thing while debugging this issue. Even though my
Default interface is set to eth0, the option CYGDAT_LWIP_ETH0_DEFAULT
in the .ecc file is still not set! I'm using "configtool" to change my
config. Is this a GUI tool issue?

I'll test out the new release and let you know.

Thanks as always.

Regards,
-mandeep

>
> http://download.westlicht.ch/lwip-20090923.tar.gz
>
> Simon
>

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