Re: [lwip-users] Update LWIP 1.2.0 to 1.4.1

[Sylvain Rochet]

Hi,


On Wed, Jan 23, 2013 at 07:38:17AM +0100, Simon Goldschmidt wrote:
> 
> Unfortunately, we don't have documents on how-to-upgrade between 
> versions (yet?).

lwip/UPGRADING seems quite complete for me, well this is not a 
step-by-step how-to strictly speaking but should be enough for anyone 
who wrote a lwip port and so already had to give a deeper look inside 
the lwip stack.


> However, I do know that from 1.2.0 to 1.3.0, ARP handling has been 
> changed: until 1.2.0, ARP packets were passed to etharp_input() from 
> your ethernetif_input function. Since that had threading issues, ARP 
> packets now must be passed to netif->input() AND the payload pointer 
> must point to the ARP header now, not the IP header.

And most sys_arch prototypes changed from 1.3.0 to 1.4.0 from returned 
pointer to pointer passed by reference, which provides better error 
handling, like this:

from  sys_sem_t sys_sem_new(u8_t count);
to    err_t sys_sem_new(sys_sem_t *sem, u8_t count);

Well, this is not such a big deal.


Sylvain

signature.asc
Description: Digital signature