Re: [lwip-users] Data packets splitting on odd boundaries -> causes exception

[Jani Monoses]

It's not clear what the problem is
Which version of lwIP are you using?
What platform?Do data need specific alignment (2 or 4 byte)
What application?The http example in the sources?


> Hi,
> 
> I guess within the LwIP stack when large data packets
> (HTTP packets) are sent in, they get split into tiny
> packets & then get sent out. The console debug output
> what I got indicates that the splitting could happen
> on odd byte boundaries. Whereas the lwip_chksum()
> routine in inet.c file assumes the pbuf payload
> pointer address to be aligned on a half-word (16bit
> address) boundary.
> 
> 
> Console output clipping:
> -----------------------
> 
> inet_chksum_pseudo(): checksumming pbuf 8014fa1c (has
> next 0)
> PBuf Flags: 0001
> PBuf Ref Cnt: 0001
> PBuf Payload ptr: 80118513
> >[3e] <[3c] /[2f] B[42] O[4f] D[44] Y[59] >[3e] <[3c]
> /[2f] h[68] t[74] m[6d] l[6c] >[3e] [00]
> lwip_chksum(80118513, 16)
> 
> !!! Exception context !!!
> BADVADDR: 0x80118513
> CAUSE: 0x00808410
> EPC: 0x8010ab5c
> ERROREPC: 0x80102eec
> DEL exception !!!
> 
> 
> Please reply to me ASAP.
> 
> Thanks to Jani Monoses & Kieran Mansley for their
> quick responses.
> 
> Thanks a lot,
> -Mike.
> 
> 
> __________________________________________________
> Do you Yahoo!?
> Yahoo! Shopping - Send Flowers for Valentine's Day
> http://shopping.yahoo.com
> 
> 
> _______________________________________________
> lwip-users mailing list
> address@hidden
> http://mail.nongnu.org/mailman/listinfo/lwip-users