This patchset implements the MP_PRIO logic according to the following lines
in RFC8684:

"""
Another use of the MP_PRIO option is to set the "B" flag on a subflow to
cleanly "retire" its use before closing it and removing it with RM_ADDR.
"""

Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/51

Geliang Tang (6):
  mptcp: add the outgoing MP_PRIO support
  mptcp: add the incoming MP_PRIO support
  mptcp: add prio_changed flag
  mptcp: send out MP_PRIO before RM_ADDR
  mptcp: add the mib for MP_PRIO
  selftests: mptcp: add MP_PRIO check in chk_rm_nr

 include/net/mptcp.h                           |  1 +
 net/mptcp/mib.c                               |  1 +
 net/mptcp/mib.h                               |  1 +
 net/mptcp/options.c                           | 53 +++++++++++++++++++
 net/mptcp/pm.c                                | 11 ++++
 net/mptcp/pm_netlink.c                        | 32 +++++++++++
 net/mptcp/protocol.c                          |  4 +-
 net/mptcp/protocol.h                          | 14 +++++
 .../testing/selftests/net/mptcp/mptcp_join.sh | 34 ++++++++----
 9 files changed, 139 insertions(+), 12 deletions(-)

-- 
2.26.2