Merge branch 'sfc-ARFS-fixes'

Edward Cree says:

====================
sfc: ARFS fixes

Three issues introduced by my recent asynchronous filter handling changes:
1. The old filter_rfs_insert would replace a matching filter of equal
   priority; we need to pass the appropriate argument to filter_insert to
   make it do the same.
2. We're lying to the kernel with our return value from ndo_rx_flow_steer,
   so we need to lie consistently when calling rps_may_expire_flow.  This
   is only a partial fix, as the lie still prevents us from steering
   multiple flows with the same ID to different queues; a proper fix that
   stops us lying at all will hopefully follow later.
3. It's possible to cause the kernel to hammer ndo_rx_flow_steer very
   hard, so make sure we don't build up too huge a backlog of workitems.

Possibly it would be better to fix #3 on the kernel side; I have a patch
 which I think does that but it's not a regression in 4.17 so isn't 'net'
 material.
There's also the issue that we come up in the bad configuration that
 triggers #3 by default, but that too is a problem for another time.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

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