Re: [PATCH net-next 1/1] selftests/net: Add packetdrill packetdrill cases

On Thu, Jan 8, 2026 at 10:58 AM [off-list ref] wrote:

From: Chia-Yu Chang <redacted>

Linux Accurate ECN test sets using ACE counters and AccECN options to
cover several scenarios: Connection teardown, different ACK conditions,
counter wrapping, SACK space grabbing, fallback schemes, negotiation
retransmission/reorder/loss, AccECN option drop/loss, different
handshake reflectors, data with marking, and different sysctl values.

Co-developed-by: Ilpo Järvinen <ij@kernel.org>
Signed-off-by: Ilpo Järvinen <ij@kernel.org>
Co-developed-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: Neal Cardwell <ncardwell@google.com>
---

Chia-Yu, thank you for posting the packetdrill tests.

A couple thoughts:

(1) These tests are using the experimental AccECN packetdrill support
that is not in mainline packetdrill yet. Can you please share the
github URL for the version of packetdrill you used? I will work on
merging the appropriate experimental AccECN packetdrill support into
the Google packetdrill mainline branch.

(2) The last I heard, the tools/testing/selftests/net/packetdrill/
infrastructure does not run tests in subdirectories of that
packetdrill/ directory, and that is why all the tests in
tools/testing/selftests/net/packetdrill/ are in a single directory.
When you run these tests, do all the tests actually get run? Just
wanted to check this. :-)

Thanks!
neal