Merge branch 'dsa-deferred-xmit'

Vladimir Oltean says:

====================
Improvements to the DSA deferred xmit

After the feedback received on v1:
https://www.spinics.net/lists/netdev/msg622617.html

I've decided to move the deferred xmit implementation completely within
the sja1105 driver.

The executive summary for this series is the same as it was for v1
(better for everybody):

- For those who don't use it, thanks to one less assignment in the
  hotpath (and now also thanks to less code in the DSA core)
- For those who do, by making its scheduling more amenable and moving it
  outside the generic workqueue (since it still deals with packet
  hotpath, after all)

There are some simplification (1/3) and cosmetic (3/3) patches in the
areas next to the code touched by the main patch (2/3).
====================

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