[PATCH v6 mptcp-next 00/22] mptcp: data checksum support

[Paolo Abeni <pabeni@redhat.com>]

Changes from v5:
 - none really, added patch lost in previous iteration due to PEBKAC

Changes from v4:
 - cope with odd-aligned csum blocks
 - avoid re-adding multiple times the same skb bits on tx
 - fix pseudo header generation (must be in NBO)

Changes from v3:
 - included Geliang's feedback
 - hopefully fixed wrong csum computation in the rx path
   for DSS+data_fin 

Changes from v2:
 - implement RFC behavior WRT csum failure and csum mismatch
 - cope with zero win probe and re-injection
 - fix csum computation for DSS with data_fin flag set

Only some Squash-to patches has been changes WRT the previous
iteration.

There is still at least a ough edge:
- the csum computation in the tx path is very suboptimal.

Anyhow, I propose to address the above with additional squash-to patches
to avoid complex/extra long review cycles.

Geliang Tang (14):
  mptcp: add csum_enabled in mptcp_sock
  mptcp: generate the data checksum
  mptcp: add csum_reqd in mptcp_out_options
  mptcp: send out checksum for MP_CAPABLE with data
  mptcp: send out checksum for DSS
  mptcp: add sk parameter for mptcp_parse_option
  mptcp: add csum_reqd in mptcp_options_received
  mptcp: receive checksum for MP_CAPABLE with data
  mptcp: receive checksum for DSS
  mptcp: validate the data checksum
  mptcp: add the mib for data checksum
  mptcp: add a new sysctl checksum_enabled
  selftests: mptcp: enable checksum in mptcp_connect.sh
  selftests: mptcp: enable checksum in mptcp_join.sh

Paolo Abeni (8):
  Squash-to: "mptcp: generate the data checksum"
  Squash-to: "mptcp: send out checksum for MP_CAPABLE with data"
  Squash-to "mptcp: send out checksum for DSS"
  Squash-to: "mptcp: receive checksum for MP_CAPABLE with data"
  Squash-to: "mptcp: receive checksum for DSS"
  Squash-to: mptcp: validate the data checksum
  mptcp: cleanup error path in subflow_check_data_avail()
  mptcp: tune re-injections for csum enabled mode.

 Documentation/networking/mptcp-sysctl.rst     |   8 +
 include/net/mptcp.h                           |   7 +-
 include/uapi/linux/mptcp.h                    |   1 +
 net/mptcp/ctrl.c                              |  14 ++
 net/mptcp/mib.c                               |   1 +
 net/mptcp/mib.h                               |   1 +
 net/mptcp/mptcp_diag.c                        |   1 +
 net/mptcp/options.c                           | 165 +++++++++++++-----
 net/mptcp/protocol.c                          |  29 ++-
 net/mptcp/protocol.h                          |  23 ++-
 net/mptcp/subflow.c                           | 146 +++++++++++++---
 .../selftests/net/mptcp/mptcp_connect.sh      |  13 +-
 .../testing/selftests/net/mptcp/mptcp_join.sh | 107 +++++++++++-
 13 files changed, 440 insertions(+), 76 deletions(-)

-- 
2.26.2