mptcp: accurate SIOCOUTQ for fallback socket
The MPTCP SIOCOUTQ implementation is not very accurate in case of fallback: it only measures the data in the MPTCP-level write queue, but it does not take in account the subflow write queue utilization. In case of fallback the first can be empty, while the latter is not. The above produces sporadic self-tests issues and can foul legit user-space application. Fix the issue additionally querying the subflow in case of fallback. Fixes: 644807e3 ("mptcp: add SIOCINQ, OUTQ and OUTQNSD ioctls") Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/260Reported-by: NMatthieu Baerts <matthieu.baerts@tessares.net> Signed-off-by: NPaolo Abeni <pabeni@redhat.com> Signed-off-by: NMat Martineau <mathew.j.martineau@linux.intel.com> Signed-off-by: NJakub Kicinski <kuba@kernel.org>
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