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Add tests for configurable TIME-WAIT reuse delay #90

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@jsitnicki jsitnicki commented Dec 4, 2024 •
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This set of tests accompanies the kernel patch set which adds a knob for
setting the TIME-WAIT reuse delay [1], which has been merged in [2].

Tests cover connection reincarnation through TIME-WAIT reuse with the
default reuse delay (1 second) as well as with a reuse delay radically
shortened down to 1 millisecond.

We exercise both the happy and failure scenarios, where TW reuse is not
possible because the required delay period has not elapsed yet.

[1] https://lore.kernel.org/all/20241204-jakub-krn-909-poc-msec-tw-tstamp-v1-0-8b54467a0f34@cloudflare.com/
[2] https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git/commit/?id=154dee7c3265bb8c1e9e87ee63dd195497155854

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matttbe pushed a commit to multipath-tcp/mptcp_net-next that referenced this pull request Dec 12, 2024
@kuba-moo
Merge branch 'make-time-wait-reuse-delay-deterministic-and-configurable'
154dee7 
Jakub Sitnicki says:

====================
Make TIME-WAIT reuse delay deterministic and configurable

This patch set is an effort to enable faster reuse of TIME-WAIT sockets.
We have recently talked about the motivation and the idea at Plumbers [1].

Experiment in production
------------------------

We are restarting our experiment on a small set of production nodes as the
code has slightly changed since v1 [2], and there are still a few weeks of
development window to soak the changes. We will report back if we observe
any regressions.

Packetdrill tests
-----------------

The packetdrill tests for TIME-WAIT reuse [3] did not change since v1.
Although we are not touching PAWS code any more, I would still like to add
tests to cover PAWS reject after TW reuse. This, however, requires patching
packetdrill as I mentioned in the last cover letter [2].

[1] https://lpc.events/event/18/contributions/1962/
[2] https://lore.kernel.org/r/20241113-jakub-krn-909-poc-msec-tw-tstamp-v2-0-b0a335247304@cloudflare.com
[3] google/packetdrill#90

v1: https://lore.kernel.org/20241204-jakub-krn-909-poc-msec-tw-tstamp-v1-0-8b54467a0f34@cloudflare.com
RFCv2: https://lore.kernel.org/20241113-jakub-krn-909-poc-msec-tw-tstamp-v2-0-b0a335247304@cloudflare.com
RFCv1: https://lore.kernel.org/20240819-jakub-krn-909-poc-msec-tw-tstamp-v1-1-6567b5006fbe@cloudflare.com
====================

Link: https://patch.msgid.link/20241209-jakub-krn-909-poc-msec-tw-tstamp-v2-0-66aca0eed03e@cloudflare.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
@jsitnicki
Add tests for configurable TIME-WAIT reuse delay
bed43c4 
This set of tests accompanies the kernel patch set which adds a knob for
setting the TIME-WAIT reuse delay [1], which has been merged in [2].

Tests cover connection reincarnation through TIME-WAIT reuse with the
default reuse delay (1 second) as well as with a reuse delay radically
shortened down to 1 millisecond.

We exercise both the happy and failure scenarios, where TW reuse is not
possible because the required delay period has not elapsed yet.

[1] https://lore.kernel.org/all/20241204-jakub-krn-909-poc-msec-tw-tstamp-v1-0-8b54467a0f34@cloudflare.com/
[2] https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git/commit/?id=154dee7c3265bb8c1e9e87ee63dd195497155854
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jsitnicki commented Dec 13, 2024

Test run against net-next @ 154dee7c3265 ("Merge branch 'make-time-wait-reuse-delay-deterministic-and-configurable'"):

root@virtme-ng:/home/jakub/src/packetdrill/gtests/net# ./packetdrill/run_all.py -v -S -L -l tcp/ts_recent/tw_reuse/
OK   [/home/jakub/src/packetdrill/gtests/net/tcp/ts_recent/tw_reuse/fast_tw_reuse_fail_after_500usec.pkt (ipv4)]
stdout:
stderr:
OK   [/home/jakub/src/packetdrill/gtests/net/tcp/ts_recent/tw_reuse/fast_tw_reuse_fail_after_500usec.pkt (ipv4-mapped-v6)]
stdout:
stderr:
OK   [/home/jakub/src/packetdrill/gtests/net/tcp/ts_recent/tw_reuse/fast_tw_reuse_fail_after_500usec.pkt (ipv6)]
stdout:
stderr:
OK   [/home/jakub/src/packetdrill/gtests/net/tcp/ts_recent/tw_reuse/fast_tw_reuse_ok_after_1msec.pkt (ipv4)]
stdout:
stderr:
OK   [/home/jakub/src/packetdrill/gtests/net/tcp/ts_recent/tw_reuse/fast_tw_reuse_ok_after_1msec.pkt (ipv4-mapped-v6)]
stdout:
stderr:
OK   [/home/jakub/src/packetdrill/gtests/net/tcp/ts_recent/tw_reuse/fast_tw_reuse_ok_after_1msec.pkt (ipv6)]
stdout:
stderr:
OK   [/home/jakub/src/packetdrill/gtests/net/tcp/ts_recent/tw_reuse/tw_reuse_fail_after_0sec.pkt (ipv4)]
stdout:
stderr:
OK   [/home/jakub/src/packetdrill/gtests/net/tcp/ts_recent/tw_reuse/tw_reuse_fail_after_0sec.pkt (ipv4-mapped-v6)]
stdout:
stderr:
OK   [/home/jakub/src/packetdrill/gtests/net/tcp/ts_recent/tw_reuse/tw_reuse_fail_after_0sec.pkt (ipv6)]
stdout:
stderr:
OK   [/home/jakub/src/packetdrill/gtests/net/tcp/ts_recent/tw_reuse/tw_reuse_fail_after_1sec_without_tsopt.pkt (ipv4)]
stdout:
stderr:
OK   [/home/jakub/src/packetdrill/gtests/net/tcp/ts_recent/tw_reuse/tw_reuse_fail_after_1sec_without_tsopt.pkt (ipv4-mapped-v6)]
stdout:
stderr:
OK   [/home/jakub/src/packetdrill/gtests/net/tcp/ts_recent/tw_reuse/tw_reuse_fail_after_1sec_without_tsopt.pkt (ipv6)]
stdout:
stderr:
OK   [/home/jakub/src/packetdrill/gtests/net/tcp/ts_recent/tw_reuse/tw_reuse_fail_after_990msec.pkt (ipv4)]
stdout:
stderr:
OK   [/home/jakub/src/packetdrill/gtests/net/tcp/ts_recent/tw_reuse/tw_reuse_fail_after_990msec.pkt (ipv4-mapped-v6)]
stdout:
stderr:
OK   [/home/jakub/src/packetdrill/gtests/net/tcp/ts_recent/tw_reuse/tw_reuse_fail_after_990msec.pkt (ipv6)]
stdout:
stderr:
OK   [/home/jakub/src/packetdrill/gtests/net/tcp/ts_recent/tw_reuse/tw_reuse_ok_after_0sec_with_portlock.pkt (ipv4)]
stdout:
stderr:
OK   [/home/jakub/src/packetdrill/gtests/net/tcp/ts_recent/tw_reuse/tw_reuse_ok_after_0sec_with_portlock.pkt (ipv4-mapped-v6)]
stdout:
stderr:
OK   [/home/jakub/src/packetdrill/gtests/net/tcp/ts_recent/tw_reuse/tw_reuse_ok_after_0sec_with_portlock.pkt (ipv6)]
stdout:
stderr:
OK   [/home/jakub/src/packetdrill/gtests/net/tcp/ts_recent/tw_reuse/tw_reuse_ok_after_1sec.pkt (ipv4)]
stdout:
stderr:
OK   [/home/jakub/src/packetdrill/gtests/net/tcp/ts_recent/tw_reuse/tw_reuse_ok_after_1sec.pkt (ipv4-mapped-v6)]
stdout:
stderr:
OK   [/home/jakub/src/packetdrill/gtests/net/tcp/ts_recent/tw_reuse/tw_reuse_ok_after_1sec.pkt (ipv6)]
stdout:
stderr:
Ran   21 tests:   21 passing,    0 failing,    0 timed out (24.01 sec): tcp/ts_recent/tw_reuse/
root@virtme-ng:/home/jakub/src/packetdrill/gtests/net#

@jsitnicki jsitnicki marked this pull request as ready for review December 13, 2024 13:00
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