RE: [lwip-users] pbuf chain and packet queue

[Bill Auerbach]

What does a pbuf chain look like after it comes back from low_level_input?

Bill

>-----Original Message-----
>From: address@hidden
>[mailto:address@hidden On
>Behalf Of Bernhard 'Gustl' Bauer
>Sent: Wednesday, January 27, 2010 8:27 AM
>To: Mailing list for lwIP users
>Subject: [lwip-users] pbuf chain and packet queue
>
>Hi,
>
>my pbufs are large enough to contain a complete packet, so pbuf chains
>should not occur. While hunting an error I discovered a pbuf with these
>settings:
>pbuf->next    !=NULL
>pbuf->len     = 568
>pbuf->tot_len = 4948
>
>My TCP_MSS is 1460. So 4948 = 3 * TCP_MSS + 568
>
>Is this a pbuf chain, or a packet queue?
>
>The description in pbuf.c indicates the first. But in the pcap file that
>is attached I have identified them as no. 196, 75, 77, and 79. So it
>must be a packet queue, mustn't ist? But then the description in pbuf.c
>is wrong.
>
>Could someone please enlighten me.
>
>Gustl
>
>
>
>