Re: [lwip-users] a question

[Leon Woestenberg]

Hello,

Craig Graham wrote:

>That's in case the packet from the ethernet is to big to fit into a single 
>pbuf, in which case you actually have a linked list of pbuf's (a chain). 'q' 
>iterates along the linked list, filling each pbuf with as much data as it 
>can, then moving on to the next pbuf in the chain until it has read the 
>entire packet from the ethernet chip.
>
>  
>
Yes, and pointer p is kept to its origin, because we might need it later
in the last part of the function:

#if ETH_PAD_SIZE
pbuf_header(p, ETH_PAD_SIZE); /* reclaim the padding word */
#endif

So, we cannot just use q to iterate over the pbuf chain.

Regards,

Leon.