[PATCH mptcp-next 0/3] mptcp: improve subflow creation on errors

[Paolo Abeni <pabeni@redhat.com>]

Currently when a subflow connection fails - either the TCP
connection is reset by the peer, or the MPJ handshake never
completes - the in kernel PM don't perform any further action.
Notably no additional subflow creation is attempted.

This series is aimed at improving the in-kernel path manager
behavior in the above scenario: on failure we try to move
to the next subflow, if any.

The first patch is minor cleanup, the feature is implemented
by patch 2/3. The last patch adds a specific self-tests.

This should possibly address/close:
https://github.com/multipath-tcp/mptcp_net-next/issues/235
https://github.com/multipath-tcp/mptcp_net-next/issues/242

@Phil: could you please have a spin in your testbed and
see if this is enough to fit you?

Paolo Abeni (3):
  mptcp: clean-up MPJ option writing.
  mptcp: do not block subflows creation on errors
  selftests: mptcp: add tests for subflow creation failure

 net/mptcp/options.c                           | 63 ++++++++++++-------
 net/mptcp/protocol.h                          |  1 +
 net/mptcp/subflow.c                           | 12 +++-
 .../testing/selftests/net/mptcp/mptcp_join.sh | 10 +++
 4 files changed, 61 insertions(+), 25 deletions(-)

-- 
2.33.1