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This implements the first steps of tracking UDP packets with the flow table
rather than its own (buggy) set of port maps. Specifically we create flow
table entries for datagrams received from a socket (PIF_HOST or
PIF_SPLICE).
When splitting datagrams from sockets into batches, we group by the flow
as well as splicesrc. This may result in smaller batches, but makes things
easier down the line. We can re-optimise this later if necessary. For now
we don't do anything else with the flow, not even match reply packets to
the same flow.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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