[MPTCP] [RFC PATCH 0/3] mptcp: just another recvmsg refactor

[Paolo Abeni <pabeni at redhat.com>]

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This start constructing the instrucutre to support pulling data from 
multiple subflow. At the current stage uses a very simply approach, dropping
any out-of-order data and reading from any subflow with valid data.

The above should work quite nicely in active backup scenario and possibly
even with multiple subflows sending data concurrently - with a low bwidth and
a huge number of retransmissions.

This is a not_so_early draft, shared as it may pave some ground and/or
partially overlap with DATA_FIN support effort

Note that this rewrite completely the recvmsg() main loop to mirror more closely
the TCP recvmsg() main loop, likely fixing some bug in respect to signal and
error condition handling.

Paolo Abeni (3):
  mptcp: move some helper into the header file
  mptcp: flush duplicate data at data_ready() time
  mptcp: recvmsg() can drain data from multiple subflows

 net/mptcp/protocol.c | 360 +++++++++++++------------------------------
 net/mptcp/protocol.h |  31 +++-
 net/mptcp/subflow.c  | 270 +++++++++++++++++++++++++++++++-
 3 files changed, 403 insertions(+), 258 deletions(-)

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2.21.0