[lwip-users] IP is longer than pbuf

[Nico Sachs]

Hello,

Im on the way to port lwIP for Renesas R62N.
I get some errors in the pbuf lengths.

As i can see the pbuf is allocated correctly, but afterwards its
cutted by -16. and thats exactly the different in the size.
Sometimes i can see it works correct but sometimes not.

I use lwIP 1.41RC1


netif: input length = 60
pbuf_alloc(length=62)
pbuf_alloc: allocated pbuf 79C4
pbuf_alloc(length=62) == 79C4
pbuf_header: old 79D4 new 79D6 (-2)
pbuf_header: old 79D6 new 79D4 (2)
tcpip_thread: PACKET 7714
pbuf_header: old 79D4 new 79E4 (-16)
IP (len 52) is longer than pbuf (len 46), IP packet dropped.

Any Idea where does it comes from? / How to find the failure?





Sometimes the Error is much higher:

netif: input length = 60
pbuf_alloc(length=62)
pbuf_alloc: allocated pbuf 81E4
pbuf_alloc(length=62) == 81E4
pbuf_header: old 81F4 new 81F6 (-2)
pbuf_header: old 81F6 new 81F4 (2)
tcpip_thread: PACKET 3D14
pbuf_header: old 81F4 new 8204 (-16)
IP (len 368) is longer than pbuf (len 46), IP packet dropped.



Thanks Nico