This is a follow up to the topic discussed in recent pubblic mtg.

Introduces unique id for accurate subflow stats tracking and
aggregate mptcp counters, plus some minimal self-tests.

The tests themself do not take in account support for running on
older kernel.

This is on top of "mptcp: a bunch of data race fixes".

There should be non trivial conflicts with:

"mptcp: use get_retrans wrapper".

v2 -> v3:
 - address Matttbe comments on patch 1, 2 and 5, see the indivdual
   patches changelog for the details

v1 -> v2:
 - introduce MPTCP_FULL_INFO instead of overloading a tcp_info field
 - add related self-tests
 - fix a couple of subflow_id initialization bugs

Paolo Abeni (6):
  mptcp: add subflow unique id
  mptcp: introduce MPTCP_FULL_INFO getsockopt
  mptcp: move snd_una update earlier for fallback socket.
  mptcp: track some aggregate data counters.
  selftests: mptcp: explicitly tests aggregate counters
  selftests: mptcp: add MPTCP_FULL_INFO testcase

 include/uapi/linux/mptcp.h                    |  21 ++++
 net/mptcp/options.c                           |  14 ++-
 net/mptcp/protocol.c                          |  24 ++--
 net/mptcp/protocol.h                          |   9 +-
 net/mptcp/sockopt.c                           |  97 ++++++++++++++++-
 net/mptcp/subflow.c                           |   2 +
 .../selftests/net/mptcp/mptcp_sockopt.c       | 103 +++++++++++++++++-
 7 files changed, 253 insertions(+), 17 deletions(-)

-- 
2.40.1