On Tue, 15 Nov 2011 18:28:55 +0800 "Yan, Zheng" <zheng.z.yan@xxxxxxxxx> wrote: > I re-tested the checksum code, both CHECKSUM_NONE and CHECKSUM_COMPLETE > cases are OK. Maybe the bug is related to sky2. > > Regards > Yan, Zheng There are three types of receive checksumming: 1. Hardware does not do checksumming (CHECKSUM_NONE) 2. Hardware validates checksum (CHECKSUM_UNNECESSARY) 3. Hardware computes sum of bytes in skb (CHECKSUM_COMPLETE) Most hardware does #2, but sky2 uses #3. For the second case, the hardware does not look at headers but only reports the one's complement value in ip_summed. It is up to the protocol layers to adjust accordingly. This means if data is removed or added the checksum needs to be adjusted. _______________________________________________ Bridge mailing list Bridge@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/bridge
