The driver I'm working on (cge) supports hw reassembly of recognized
flows (I think this might be considered LRO, but I'm not sure -- I'm
relatively new at this). Directly from the driver, you get a buffer
for each header of the packet, then the data portion for all those
packets (of the same flow) assembled into a single contiguous buffer.
The obvious thing is to create an mblk chain, with 2 fragments for
each packet (1 for the header, 1 for the data), and then pass the
entire chain up in a single mac_rx() call. Since the data is
contiguous, are the upper layers (i.e. tcp/ip) able to detect the
condition and take advantage of the situation, or does the driver need
to do more work (such as collapsing it down to a single mblk, possibly
with 2 fragments), or does it require some sort of signal/flag to
indicate such a condition?
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