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[RFC,0/4] mptcp: just another receive path refactor

Message ID cover.1621963632.git.pabeni@redhat.com
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Series mptcp: just another receive path refactor | expand

Message

Paolo Abeni May 25, 2021, 5:37 p.m. UTC 
Some recent issues outlined we have perhaps too much complexity
in the receive path and memory accounting.

After recent changes in release_cb() we can drop most such complexity
in favour of some more traditional RX/memory accounting schema.

This is the result.

The first 2 patches are actually bugfixes, even if I don't understand
why we almost never hit the condition addressed by patch 1/4 (and
the patched kernel hits hit frequently).

The 3rd patch introduces the major change, and the fouth is just
cleanup.

This could have some negative performance effects, as on average more
locking is required for each packet. I'm doing some perf test and will
report the results.

Paolo Abeni (4):
  mptcp: wake-up readers only for in sequence data.
  mptcp: don't clear MPTCP_DATA_READY in sk_wait_event()
  mptcp: move the whole rx path under msk socket lock protection
  mptcp: cleanup mem accounting.

 net/mptcp/protocol.c | 298 +++++++++----------------------------------
 net/mptcp/protocol.h |  20 +--
 net/mptcp/subflow.c  |  15 +--
 3 files changed, 68 insertions(+), 265 deletions(-)