difference between lwip and lxip

[Guido Witmond]

Hi Emery,

 From the release notes 13-11 I understood that migrating from lwip to 
lxip was just a matter of reconfiguring:

 > From the application developer's point of view, the use of LXIP
 > instead of LwIP is as simple as replacing the 'libc_lwip_dhcp' 
library > with the  'libc_lxip' library.

But I ran into the bug I mentioned yesterday.

I'll give your suggestion a spin. Hopefully that gives me a working 
server with lxip.

Cheers, Guido.




On 07/16/2018 10:00 AM, Emery Hemingway wrote:
> Hello Guido,
> 
> Both the libc_lxip and libc_lwip libraries will be removed soon.
> The libc library has its own Berkly socket support that uses the
> VFS to access an IP stack. Your only option at the moment is the
> vfs_lxip plugin, but there will be a vfs_lwip plugin on staging
> soon. The benefit to you is that you will be able to test both
> using run-time rather than link-time configuration.
> 
> The following run script demonstrates how to configure the VFS:
> https://github.com/genodelabs/genode/blob/master/repos/libports/run/netty_tcp.run 
> 
> https://github.com/genodelabs/genode/blob/master/repos/libports/run/netty.inc 
> 
> 
> Cheers,
> Emery
> 
> On Monday, July 16, 2018 12:11:56 AM CEST, Guido Witmond wrote:
>> Hi All,
>>
>> I've been playing with lwip and lxip and I noticed a discrepancy 
>> between them. I made a tester-application [1] to pinpoint these 
>> differences.
>>
>> The application gets a DHCP-address, opens a berkeley socket, binds to 
>> it, sets listen mode and accepts an incoming request. Then it sends a 
>> simple string back and waits for a new request.
>>
>> With lwip it works as expected. With lxip it runs until the 
>> accept-step. There it times out after roughly 10 seconds with errno 21 
>> (EINVAL) Invalid argument.
>>
>> However if I connect to it with a client before the timeout hits, it 
>> serves a reply and resets the timer. I can keep the application alive 
>> for as long as I keep requests coming in.
>>
>> I understood that lxip was plug-in compatible with lwip but somehow 
>> lxip does not have the patience that lwip has.
>>
>> Is this a bug in lxip or is there a missing dependency for lxip?
>>
>> I've added the make run/tester_l[wx]ip log files in the repo. The lxip 
>> one has scary warning about incompatible type conversions.
>>
>> Cheers, Guido.
>>
>>
>> 1: https://github.com/gwitmond/tester
>>
> 
> 
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