Re: [lwip-users] LWIP - TCP receive assert failed

[Sylvain Rochet]

Hello Jackie,


On Fri, Jan 23, 2015 at 11:43:33PM +0800, Jackie wrote:
> Hi Sylvian,
> 
> Yeah, you are right.
> 
> If I am correct, actually LWIP provides a basic structure of PPP stack,

Well, your version, perhaps, but I must disagree, you are not correct.

lwIP provides a PPP stack with PPPoS(erial) PPPoE(thernet) and PPPoL2TP 
(Layer 2 Tunneling Protocol) support, as well as supporting PAP, CHAP, 
MSCHAPv1, MSCHAPv2, EAP, IPCP, IP6CP (IPv6), VJ Compression.

This is quite far from a "basic structure", this is a bit hard to read, 
considering the amount of time I spent on working on PPP support, but I 
know you are just reading the source code of a very very very old lwIP 
version :-)


> how to send the data down to SIO also depends on the OS currently in
> use, some special methods can be done in order to increase the
> robustness of the system. So our supplier just did some work based on
> LWIP's PPP stack, adding more optimization.

Yeah, in master, the SIO input fonction is thread safe, and of course 
the SIO output is called from the stack and usual threading care should 
be applied.


> So I think my issue is not from LWIP itself, but our supplier's code.

Or from a very old lwIP version, which is almost exactly the same from 
our point of view ;-)


Sylvain

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