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mptcp: implement TCP_NOTSENT_LOWAT support

Paolo Abeni requested to merge pabeni/centos-stream-9:mptcp_95_partial_rebase into main

JIRA: https://issues.redhat.com/browse/RHEL-28492 Tested: LNST, Tier1, self-tests

The core feature is implement with the second to last patch and in preceded by a quite long list of pre-requisites. The pre-req themself have been selected in the most lazy and safe way, bringing the rhel mptcp core implementation on par with upstream at commit 29b5e5ef8739 ("mptcp: implement TCP_NOTSENT_LOWAT support"), with the only exception of userspace_pm changes (out of scope here), and changes depending on missing core features. The last patch is a small cleanup, from the same upstream series introducing TCP_NOTSENT_LOWAT.

Signed-off-by: Paolo Abeni pabeni@redhat.com

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