[PATCH mptcp-next 0/4] mptcp: add some more diag info

[Paolo Abeni <pabeni@redhat.com>]

This is a follow up to the topic discussed in recent pubblic mtg.

Introduces unique id for accurate subflow stats tracking and
aggregate mptcp counters, plus some minimal self-tests.

The tests themself do not take in account support for running on
older kernel.

This is on top of "selftests: mptcp: centralize stats dumping" - 
that is should land not on top of the current export branch head.

That in turn will cause some non trivial conflicts with:

"mptcp: use get_retrans wrapper"

the resolution should like the following (for brevity only reporting
the lines affected by the conflict resolution)

---
@@ -2574,16 +2569,17 @@ static void mptcp_check_fastclose(struct mptcp_sock *msk)
 static void __mptcp_retrans(struct sock *sk)
 {
 	struct mptcp_sock *msk = mptcp_sk(sk);
+	struct mptcp_subflow_context *subflow;
 	struct mptcp_sendmsg_info info = {};
 	struct mptcp_data_frag *dfrag;
-	size_t copied = 0;
+	u16 already_sent, len = 0;
 	struct sock *ssk;
-	int ret;
+	int ret, err;

	// ...
@@ -2602,32 +2598,48 @@ static void __mptcp_retrans(struct sock *sk)
	// ...
 
-	release_sock(ssk);
+	already_send = max(dfrag->already_sent, len);
+	msk->bytes_retrans += already_sent - dfrag->alread_sent;
+	dfrag->already_sent = already_sent;

	// ...

Paolo Abeni (4):
  mptcp: add subflow unique id
  mptcp: move snd_una update earlier for fallback socket.
  mptcp: track some aggregate data counters.
  selftests: mptcp: explicitly tests aggregate countes

 include/uapi/linux/mptcp.h                    |  8 +++++++
 net/mptcp/options.c                           | 14 ++++++++++-
 net/mptcp/protocol.c                          | 20 ++++++++++------
 net/mptcp/protocol.h                          |  9 +++++++-
 net/mptcp/sockopt.c                           | 23 +++++++++++++++----
 .../selftests/net/mptcp/mptcp_sockopt.c       | 20 ++++++++++++++++
 6 files changed, 80 insertions(+), 14 deletions(-)

-- 
2.40.0