[RFC PATCH mptcp-next v7 00/11] mptcp: Fast Open Mechanism

[Dmytro Shytyi <dmytro@shytyi.net>]

[PATCH v7] includes "client-server" partial support for:
1. MPTCP cookie request from client (seems OK).
2. MPTCP cookie offering from server (seems OK).
3. MPTCP SYN+DATA+COOKIE from client (seems OK).
4. subsequent write + read on the opened socket (seems OK).

===Changes between v6 and v7
- Order of commits is changed.
- Code is refactored
===Pros/Cons of v7:
- little modifications of existing TCP code in linux kernel.
- relatively decreased size of the patch (in comparison with v6)
due to reuse of some functions in tcp_fastopen.c.
===Future work:
-Adress the appearance of "MPTCP FIN" as duplicated acks. 

Signed-off-by: Dmytro Shytyi <dmytro@shytyi.net>

Dmytro Shytyi (11):
  Add separate fastopen.c file.
  add mptcp_stream_connect to protocol.h
  Initiator: MSG_FASTOPEN sendto(). request cookie
  rfree(), rmem_uncharge() prototypes to protocol.h
  Initiator: add locks() to mptcp_sendmsg_fastopen.
  add mptcp_setsockopt_fastopen
  mptfo variables for msk, options. Fix loop retrans
  Fix unxpctd val of subflow->map_seq(dscrd packet)
  Listener: Add received skb to msk
  mptcp_fastopen_add_skb() helpers (skb to msk)
  selftests: mptfo initiator/listener

 include/net/tcp.h                             |  27 ++
 net/ipv4/tcp_fastopen.c                       |  38 +-
 net/ipv4/tcp_input.c                          |  20 +-
 net/mptcp/Makefile                            |   2 +-
 net/mptcp/fastopen.c                          | 331 ++++++++++++++++++
 net/mptcp/options.c                           |   3 +
 net/mptcp/protocol.c                          |  12 +-
 net/mptcp/protocol.h                          |  56 ++-
 net/mptcp/sockopt.c                           |   3 +
 net/mptcp/subflow.c                           |   8 +-
 tools/testing/selftests/net/mptcp/mptfo.sh    |  13 +
 .../selftests/net/mptcp/mptfo_initiator.c     |  41 +++
 .../selftests/net/mptcp/mptfo_listener.c      |  98 ++++++
 13 files changed, 614 insertions(+), 38 deletions(-)
 create mode 100644 net/mptcp/fastopen.c
 create mode 100644 tools/testing/selftests/net/mptcp/mptfo.sh
 create mode 100644 tools/testing/selftests/net/mptcp/mptfo_initiator.c
 create mode 100644 tools/testing/selftests/net/mptcp/mptfo_listener.c

-- 
2.25.1