---Original Message-----
From: Neal Cardwell ncardwell@google.com Sent: Friday, January 9, 2026 12:21 AM To: Chia-Yu Chang (Nokia) chia-yu.chang@nokia-bell-labs.com Cc: pabeni@redhat.com; edumazet@google.com; parav@nvidia.com; linux-doc@vger.kernel.org; corbet@lwn.net; horms@kernel.org; dsahern@kernel.org; kuniyu@google.com; bpf@vger.kernel.org; netdev@vger.kernel.org; dave.taht@gmail.com; jhs@mojatatu.com; kuba@kernel.org; stephen@networkplumber.org; xiyou.wangcong@gmail.com; jiri@resnulli.us; davem@davemloft.net; andrew+netdev@lunn.ch; donald.hunter@gmail.com; ast@fiberby.net; liuhangbin@gmail.com; shuah@kernel.org; linux-kselftest@vger.kernel.org; ij@kernel.org; Koen De Schepper (Nokia) koen.de_schepper@nokia-bell-labs.com; g.white@cablelabs.com; ingemar.s.johansson@ericsson.com; mirja.kuehlewind@ericsson.com; cheshire cheshire@apple.com; rs.ietf@gmx.at; Jason_Livingood@comcast.com; Vidhi Goel vidhi_goel@apple.com; Willem de Bruijn willemb@google.com Subject: Re: [PATCH net-next 1/1] selftests/net: Add packetdrill packetdrill cases
CAUTION: This is an external email. Please be very careful when clicking links or opening attachments. See the URL nok.it/ext for additional information.
On Thu, Jan 8, 2026 at 5:46 PM Neal Cardwell ncardwell@google.com wrote:
On Thu, Jan 8, 2026 at 10:58 AM chia-yu.chang@nokia-bell-labs.com wrote:
From: Chia-Yu Chang chia-yu.chang@nokia-bell-labs.com
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.
Oh, for that part I see you mentioned this already in the cover letter:
The used packetdrill is commit 6f2116af6b7e1936a53e80ab31b77f74abda1aaa of the branch: https://github.com/minuscat/packetdrill_accecn
Thanks! neal
Hi Neal,
You're right, I will change the tile into "selftests/net: Add AccECN packetdrill cases" And this packetdrill is forked from branch "l4s-packetdrill-2022-08-21-v1" of https://github.com/google/bbr.git
If you would like me to test on newer packetdrill, feel free to let me know.
Thanks. Chia-Yu