[PATCH v2 mptcp-next 0/7] mptcp: autotune related improvement

[Paolo Abeni <pabeni@redhat.com>]

This series collects a few follow-up for the backlog refactor, with some
of them posing as fixes just to confuse the enemy (or feel the season
mood)

Targeting net-next as the issues addressed are very old, the change
is quite invasive and, as mentioned, based on the BL refactor.

Only patch 2/7 could be considered for net, but still included because
somewhat related to the others and to keep my life easy.

Overall this:
- introduces a tracepoint similar to tcp useful to track down the issues
  addressed here
- avoid rx drop in corner case scenarios, improving tput stability and
  peak tput over fast link
- refactor the rcv space and rtt estimator, overall making DRS more
  correct and avoiding rcv buffer drifting to tcp_rmem[2], which in
  turn makes the tput more stable and less bursty
---
v1 -> v2:
  - new patch 1/7
  - old patch 2/4 has been split in 3: 3/7, 4/7 and 5/7
  - refactor both the rcv space init and rtt estimator

Paolo Abeni (7):
  trace: mptcp: add mptcp_rcvbuf_grow tracepoint
  mptcp: avoid unneeded subflow-level drops.
  mptcp: fix receive space timestamp initialization.
  mptcp: consolidate rcv space init
  mptcp: better rcv space initialization
  mptcp: better mptcp-level rtt estimator
  mptcp: add receive queue awareness in tcp_rcv_space_adjust()

 include/trace/events/mptcp.h |  74 +++++++++++++++++
 net/mptcp/options.c          |  31 +++++++
 net/mptcp/protocol.c         | 154 ++++++++++++++++++++++-------------
 net/mptcp/protocol.h         |  44 +++++++++-
 net/mptcp/subflow.c          |   5 +-
 5 files changed, 247 insertions(+), 61 deletions(-)

-- 
2.51.0