On 2012-07-19 18:28:57 (+0530), Murali Annamneni <a.murali@xxxxxxx> wrote: > Hi All, > > I have written a kernel module using netfilter framework. In my code I'll do some modifications to the header & payload parts of UDP packet in pre & post hooks. > After modifying the udp packet, I'm computing ip & udp checksum. This computation is consuming some cpu cycles. > Now, I want to offload this computation to the Ethernet device. For this I have commented the checksum computation in my code and enabled the checksum offload parameters of my Ethernet device. > While testing, I found that kernel is dropping the packets because of invalid checksums for ip & udp packets. > I have few doubts regarding checksum offload > Wild guess: try setting the checksum to zero before sending the packet. It's possible that the offload engine won't recompute checksums unless they're zero (i.e. it might assume non-zero checksums are already correct). Regards, Kristof _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
