Re: [lwip-users] a question

[Craig Graham]

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.

On Monday 08 November 2004 12:18, jack W wrote:
>  hi everyone
>
>    i have a question about the file ethernetif.c. In the  file there is a
> function low_level_input() and in the function , i must use the pbuf to
> fill the packet
>
>
>     /* We iterate over the pbuf chain until we have read the entire
>      * packet into the pbuf. */
>     for(q = p; q != NULL; q = q->next) {
>       /* Read enough bytes to fill this pbuf in the chain. The
>        * available data in the pbuf is given by the q->len
>        * variable. */
>       read data into(q->payload, q->len);
>     }
>     acknowledge that packet has been read();
>
>
> i don't understand why use p and q .
>
>
>
>
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