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

On Thu, Jan 8, 2026 at 5:46 PM Neal Cardwell [off-list ref] wrote:

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

quoted

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.

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