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mptcp: push pending frames when subflow has free space
When multiple subflows are active, we can receive a window update on subflow with no write space available. MPTCP will try to push frames on such subflow and will fail. Pending frames will be pushed only after receiving a window update on a subflow with some wspace available. Overall the above could lead to suboptimal aggregate bandwidth usage. Instead, we should try to push pending frames as soon as the subflow reaches both conditions mentioned above. We can finally enable self-tests with asymmetric links, as the above makes them finally pass. Reviewed-by: Mat Martineau <mathew.j.martineau@linux.intel.com> Signed-off-by: Paolo Abeni <pabeni@redhat.com>
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