Re: [lwip-users] Program hangs in ip_frag()

[pekez]

I am not able to step through files that are part of BSP. Not much help 
of a debugger. I am using Xilinx SDK. So far I have been printing, and I 
found out that program get stuck inside of while (left_to_copy) loop in 
ip_frag(). left_to_copy is 1448 all the time... p->len is 0.

I am confused why ip_frag is called only sometimes. It is called from here:

if (netif->mtu && (p->tot_len > netif->mtu)) {
    return ip_frag(p, netif, dest);
  }

netif->mtu is always > 0, so that means the other argument is true as 
well. I don't get why p->tot_len is sometimes bigger than netif->mtu, 
since I am always doing the same thing from application. Can you explain 
this? I have little knowledge on how TCP works under the hood.

When program works fine, it never gets into ip_frag, so that means it 
get stuck only when this function is called.

On 2.3.2017 19:48, address@hidden wrote:
> pekez wrote:
> > I have not real clue what is going on.
>
> Me neither.
>
> You seem to have a debugger, why don't you try to find out? ;-)
> (I.e. see where/why it hangs to try to give us more information or 
> even be able to fix it yourself)
>
> Cheers,
> Simon
>
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