WRT to the previous iteration, this adds the first patch, which allow
cleaning-up the existing code and the sndbuf autotuning code more than
a bit.

Relevant bits from the previous cover letter:

There are still some sporadic self-test failures for assimetric links.
Looks like they are caused by retransmissions/receiver dropping packets
due to MPTCP level OoO check.

I'll try to address that asap, but I still consider this series for
inclusion, so that it can stage a bit in the export branch.

Note: the last patch re-introduces the workqueue usage for the datapath (yes,
it makes me feel sick, sad and tired :(. I was unable to avoid it.

There is weird and convoluted schema to possibly avoiding (again) the
workqueue usage. If you don't feel too scaring using a fake NAPI instance
to delegate actions to other mptcp subflows, I can try to cook that...

Paolo Abeni (4):
  mptcp: always graft subflow socket to parent.
  mptcp: re-enable sndbuf autotune
  mptcp: do not queue excessive data on subflows.
  mptcp: schedule work for better snd subflow selection

 net/mptcp/protocol.c | 108 ++++++++++++++++++-------------------------
 net/mptcp/protocol.h |  21 +++++++++
 net/mptcp/subflow.c  |  13 +++++-
 3 files changed, 77 insertions(+), 65 deletions(-)

-- 
2.26.2