Hello!
> What I actually want to do is caching of 802.3ac headers (with vlan tag,
> priority and CFI). The length of this header is 18 bytes. So it is not
> some specific fast device, it can be any ethernet device.
If 802.1q is implemented via virtual device, it does not make
much of sense to cache its header, normal (not hh_cached) path in 2.2
is not a slow path, and the difference will dissolve on background
of additional indirection.
Alexey
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