kernel/tools/testing/selftests/net/packetdrill, branch master

selftests/net: packetdrill: restore tcp_rcv_big_endseq.pkt

2026-03-03T02:47:46Z

Commit 1cc93c48b5d7 ("selftests/net: packetdrill: remove tests for tcp_rcv_*big") removed the test for the reverted commit 1d2fbaad7cd8 ("tcp: stronger sk_rcvbuf checks") but also the one for commit 9ca48d616ed7 ("tcp: do not accept packets beyond window"). Restore the test with the necessary adaptation: expect a delayed ACK instead of an immediate one, since tcp_can_ingest() does not fail anymore for the last data packet. Signed-off-by: Simon Baatz Link: https://patch.msgid.link/20260301-tcp_rcv_big_endseq-v1-1-86ab7415ab58@gmail.com Signed-off-by: Jakub Kicinski

selftests/net: packetdrill: remove tests for tcp_rcv_*big

2026-02-28T15:55:52Z

Since commit 1d2fbaad7cd8 ("tcp: stronger sk_rcvbuf checks") has been reverted we need to remove the corresponding tests. Link: https://lore.kernel.org/20260227003359.2391017-1-kuba@kernel.org Link: https://patch.msgid.link/20260227033446.2596457-1-kuba@kernel.org Signed-off-by: Jakub Kicinski

selftests/net: packetdrill: Verify acceptance of FIN packets when RWIN is 0

2026-02-26T03:07:02Z

Add a packetdrill test that verifies we accept bare FIN packets when the advertised receive window is zero. Signed-off-by: Simon Baatz Reviewed-by: Eric Dumazet Reviewed-by: Kuniyuki Iwashima Link: https://patch.msgid.link/20260224-fix_zero_wnd_fin-v2-2-a16677ea7cea@gmail.com Signed-off-by: Jakub Kicinski

selftests/net: packetdrill: add ipv4-mapped-ipv6 tests

2026-02-19T00:45:30Z

Add ipv4-mapped-ipv6 case to ksft_runner.sh before an upcoming TCP fix in this area. Signed-off-by: Eric Dumazet Reviewed-by: Willem de Bruijn Link: https://patch.msgid.link/20260217142924.1853498-1-edumazet@google.com Signed-off-by: Jakub Kicinski

selftests/net: packetdrill: add TCP Accurate ECN cases

2026-02-03T14:13:25Z

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. The packetdrill used is commit cbe405666c9c8698ac1e72f5e8ffc551216dfa56 of repo: https://github.com/minuscat/packetdrill/tree/upstream_accecn. And corresponding patches are sent to google/packetdrill email list. Signed-off-by: Chia-Yu Chang Co-developed-by: Ilpo Järvinen Signed-off-by: Ilpo Järvinen Co-developed-by: Neal Cardwell Signed-off-by: Neal Cardwell Reviewed-by: Eric Dumazet Link: https://patch.msgid.link/20260131222515.8485-16-chia-yu.chang@nokia-bell-labs.com Signed-off-by: Paolo Abeni

selftest: packetdrill: add tcp_timestamping_tcp_tx_timestamp_bug.pkt

2026-01-29T03:35:39Z

Test tcp_tx_timestamp() behavior after ("tcp: tcp_tx_timestamp() must look at the rtx queue"). Without the fix, this new test fails like this: tcp_timestamping_tcp_tx_timestamp_bug.pkt:55: runtime error in recvmsg call: Expected result 0 but got -1 with errno 11 (Resource temporarily unavailable) Signed-off-by: Eric Dumazet Reviewed-by: Jason Xing Link: https://patch.msgid.link/20260127123828.4098577-3-edumazet@google.com Signed-off-by: Jakub Kicinski

selftests/net: packetdrill: add minimal client and server tests

2026-01-07T01:38:26Z

Introduce minimal tests. These can serve as simple illustrative examples, and as templates when writing new tests. When adding new cases, it can be easier to extend an existing base test rather than start from scratch. The existing tests all focus on real, often non-trivial, features. It is not obvious which to take as starting point, and arguably none really qualify. Add two tests - the client test performs the active open and initial close - the server test implements the passive open and final close Signed-off-by: Willem de Bruijn Link: https://patch.msgid.link/20260105172529.3514786-1-willemdebruijn.kernel@gmail.com Signed-off-by: Jakub Kicinski

selftests/net: packetdrill: pass send_omit_free to MSG_ZEROCOPY tests

2025-11-26T23:57:55Z

The --send_omit_free flag is needed for TCP zero copy tests, to ensure that packetdrill doesn't free the send() buffer after the send() call. Fixes: 1e42f73fd3c2 ("selftests/net: packetdrill: import tcp/zerocopy") Closes: https://lore.kernel.org/netdev/20251124071831.4cbbf412@kernel.org/ Suggested-by: Neal Cardwell Signed-off-by: Willem de Bruijn Link: https://patch.msgid.link/20251125234029.1320984-1-willemdebruijn.kernel@gmail.com Signed-off-by: Jakub Kicinski

selftest: packetdrill: Add max RTO test for SYN+ACK.

2025-11-08T02:05:26Z

This script sets net.ipv4.tcp_rto_max_ms to 1000 and checks if SYN+ACK RTO is capped at 1s for TFO and non-TFO. Without the previous patch, the max RTO is applied to TFO SYN+ACK only, and non-TFO SYN+ACK RTO increases exponentially. # selftests: net/packetdrill: tcp_rto_synack_rto_max.pkt # TAP version 13 # 1..2 # tcp_rto_synack_rto_max.pkt:46: error handling packet: timing error: expected outbound packet at 5.091936 sec but happened at 6.107826 sec; tolerance 0.127974 sec # script packet: 5.091936 S. 0:0(0) ack 1 # actual packet: 6.107826 S. 0:0(0) ack 1 win 65535 # not ok 1 ipv4 # tcp_rto_synack_rto_max.pkt:46: error handling packet: timing error: expected outbound packet at 5.075901 sec but happened at 6.091841 sec; tolerance 0.127976 sec # script packet: 5.075901 S. 0:0(0) ack 1 # actual packet: 6.091841 S. 0:0(0) ack 1 win 65535 # not ok 2 ipv6 # # Totals: pass:0 fail:2 xfail:0 xpass:0 skip:0 error:0 not ok 49 selftests: net/packetdrill: tcp_rto_synack_rto_max.pkt # exit=1 With the previous patch, all SYN+ACKs are retransmitted after 1s. # selftests: net/packetdrill: tcp_rto_synack_rto_max.pkt # TAP version 13 # 1..2 # ok 1 ipv4 # ok 2 ipv6 # # Totals: pass:2 fail:0 xfail:0 xpass:0 skip:0 error:0 ok 49 selftests: net/packetdrill: tcp_rto_synack_rto_max.pkt Signed-off-by: Kuniyuki Iwashima Reviewed-by: Eric Dumazet Link: https://patch.msgid.link/20251106003357.273403-7-kuniyu@google.com Signed-off-by: Jakub Kicinski

selftests/net: packetdrill: unflake tcp_user_timeout_user-timeout-probe.pkt

2025-10-16T23:25:09Z

This test fails the first time I am running it after a fresh virtme-ng boot. tcp_user_timeout_user-timeout-probe.pkt:33: runtime error in write call: Expected result -1 but got 24 with errno 2 (No such file or directory) Tweaks the timings a bit, to reduce flakiness. Signed-off-by: Eric Dumazet Cc: Soham Chakradeo Cc: Willem de Bruijn Reviewed-by: Kuniyuki Iwashima Tested-by: Jamal Hadi Salim Acked-by: Jamal Hadi Salim Link: https://patch.msgid.link/20251014171907.3554413-2-edumazet@google.com Signed-off-by: Jakub Kicinski