[MPTCP] [RFC PATCH v2 0/8] mptcp: implement retransmit infrastructure

[Paolo Abeni <pabeni at redhat.com>]

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Note this is still early draft, only lightly tested. It builds and somtimes
it passes the selftests

In addition to the first iteration now:
- implement actual retransmission infrastructure and trigger it when MPTCP
  timer expires (patches 7,8)
- fixes several bugs in many patches - but others are still there

RFC v1:
- updates the MPTCP unacked sequence number (patches 1-3) on sendmsg()
  - also try to cope with 32 bit sequence number
- queue data (page frags) in MPTCP retransmission queue
- cleanup acked data from retransmission queue and schedule a timeout to
   update MPTCP unacked sequence number (patch 5)

Open points:
- IIRC, the RFC mandate to always retransmit even on the failing subflow (?!?)
  why? Should we preserve the original subflow seq number, so that
  retransmission there will get the same mapping as the original packet?

Paolo Abeni (8):
  mptcp: move before/after64 into the header file
  mptcp: update per subflow unacked sequence on pkt reception
  mptcp: update msk unacked sequence in sendmsg()
  mptcp: queue data for mptcp level retransmission
  mptcp: use retransmission timer to update msk una
  mptcp: implement memory accounting for mptcp rtx queue
  mptcp: rework mptcp_sendmsg_frag to accept optional dfrag
  mptcp: implement and use MPTCP-level retransmission

 net/mptcp/options.c  |  31 +++-
 net/mptcp/protocol.c | 405 +++++++++++++++++++++++++++++++++++++++----
 net/mptcp/protocol.h |  41 +++++
 3 files changed, 437 insertions(+), 40 deletions(-)

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2.21.0