mptcp: add and use mptcp_data_ready helper
allows us to schedule the work queue to drain the ssk receive queue in a followup patch. This is needed to avoid sending all-to-pessimistic mptcp-level acknowledgements. At this time, the ack_seq is what was last read by userspace instead of the highest in-sequence number queued for reading. Signed-off-by: Florian Westphal <fw@strlen.de> Reviewed-by: Mat Martineau <mathew.j.martineau@linux.intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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