mptcp: refine mptcp_cleanup_rbuf

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The current cleanup rbuf tries a bit too hard to avoid acquiring
the subflow socket lock. We may end-up delaying the needed ack,
or skip acking a blocked subflow.

Address the above extending the conditions used to trigger the cleanup
to reflect more closely what TCP does and invoking tcp_cleanup_rbuf()
on all the active subflows.

Note that we can't replicate the exact tests implemented in
tcp_cleanup_rbuf(), as MPTCP lacks some of the required info - e.g.
ping-pong mode.

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Paolo Abeni 2021-06-22 12:25:23 -07:00 • committed by David S. Miller

parent d8e336f77e

commit fde56eea01

2 changed files with 23 additions and 34 deletions

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56

net/mptcp/protocol.c

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1

net/mptcp/protocol.h

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