Is there a way to guarantee headroom for the Tx packets to be used in the
Mac driver. Increasing the hard_header_len doesn't seem to be the way to go
because in the TCP processing skbuffs are allocated with MAX_HEADER_LEN and
it doesn't seem appropriate to bank on this macro. If I want to pass some
"extra" information (say, some descriptor realted) to the MAC by prepending
the packet, what is the best way to do it? I guess, one could argue that it
is no longer a true ethernet header and hence a new header should be
introduced. However, the extra information is not any mutated mac header but
is some descriptor information that needs to be passed with packet for
performance reasons. Needless to say, I'm hoping to avoid using
skb_realloc_header in the driver.
-Venu
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