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offload bugs by manual padding for short IP/UDP frames. Unfortunately it seems that these workaround does not work reliably on newer PCIe variants of RealTek chips. To workaround the hardware bug, always pad short frames if Tx IP checksum offload is requested. It seems that the hardware has a bug in IP checksum offload handling. NetBSD manually pads short frames only when the length of IP frame is less than 28 bytes but I chose 60 bytes to safety. Also unconditionally set IP checksum offload bit in Tx descriptor if any TCP or UDP checksum offload is requested. This is the same way as Linux does but it's not mentioned in data sheet. Obtained from: NetBSD Tested by: remko, danger
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