Cathy Zhou writes:
 > > Today, checksumming support is not optional, at least for partial 
 > > checksums.  
 > 
 > Why is that? Assuming a hardware does not know of any VLAN semantics, it 
 > might be able to do HW checksums for non-VLAN frames but not for VLAN frames.

Please don't make that assumption without providing the capability
bits for devices like mine to inform the system that it can handle
checksum offload just fine.  That sort of assumption coupled with no
capability bits to tell the OS otherwise is why I need to "fake" vlan
tag insertion on other OSes.

Drew
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