<p>For the most part I imagine that this makes implementation for some devices easier and as you have shown the handling of received packets faster. However, I don't like that this requires an extra buffer and thus potentially breaks the copy-once paradigm a network stack might want to ensure. Moreover, for link layers with smaller packet sizes this might be fine, but e.g. all Ethernet devices would require an extra 1500 B of RAM with that. This is IMHO a no-go.</p>

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