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linux-kernelorg-stable/tools/testing/selftests/net/packetdrill
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Kuniyuki Iwashima ffc56c9081 selftest: packetdrill: Add max RTO test for SYN+ACK. 
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 <mss 1460,nop,nop,sackOK>
  # actual packet:  6.107826 S. 0:0(0) ack 1 win 65535 <mss 1460,nop,nop,sackOK>
  # 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 <mss 1460,nop,nop,sackOK>
  # actual packet:  6.091841 S. 0:0(0) ack 1 win 65535 <mss 1460,nop,nop,sackOK>
  # 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 <kuniyu@google.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20251106003357.273403-7-kuniyu@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
 		2025-11-07 18:05:26 -08:00
..
Makefile selftests: net: unify the Makefile formats 2025-10-06 13:14:06 -07:00
config selftests: net: sort configs 2025-10-06 13:12:59 -07:00
defaults.sh selftest: packetdrill: Define common TCP Fast Open cookie. 2025-09-29 18:41:19 -07:00
ksft_runner.sh selftest: packetdrill: Import sockopt-fastopen-key.pkt 2025-09-29 18:41:39 -07:00
set_sysctls.py selftests/net: packetdrill: import tcp/zerocopy 2024-09-12 19:04:37 -07:00
tcp_blocking_blocking-accept.pkt selftests/net: packetdrill: import tcp/eor, tcp/splice, tcp/ts_recent, tcp/blocking 2024-12-18 10:05:33 -08:00
tcp_blocking_blocking-connect.pkt selftests/net: packetdrill: import tcp/eor, tcp/splice, tcp/ts_recent, tcp/blocking 2024-12-18 10:05:33 -08:00
tcp_blocking_blocking-read.pkt selftests/net: packetdrill: add --mss option to three tests 2025-07-11 17:01:31 -07:00
tcp_blocking_blocking-write.pkt selftests/net: packetdrill: import tcp/eor, tcp/splice, tcp/ts_recent, tcp/blocking 2024-12-18 10:05:33 -08:00
tcp_close_close-local-close-then-remote-fin.pkt selftests/net: packetdrill: import tcp/ecn, tcp/close, tcp/sack, tcp/tcp_info 2024-12-18 10:05:28 -08:00
tcp_close_close-on-syn-sent.pkt selftests/net: packetdrill: import tcp/ecn, tcp/close, tcp/sack, tcp/tcp_info 2024-12-18 10:05:28 -08:00
tcp_close_close-remote-fin-then-close.pkt selftests/net: packetdrill: import tcp/ecn, tcp/close, tcp/sack, tcp/tcp_info 2024-12-18 10:05:28 -08:00
tcp_close_no_rst.pkt selftests/net: packetdrill: add tcp_close_no_rst.pkt 2025-09-04 19:13:41 -07:00
tcp_dsack_mult.pkt selftests/net: packetdrill: add tcp_dsack_mult.pkt 2025-06-27 15:35:03 -07:00
tcp_ecn_ecn-uses-ect0.pkt selftests/net: packetdrill: import tcp/ecn, tcp/close, tcp/sack, tcp/tcp_info 2024-12-18 10:05:28 -08:00
tcp_eor_no-coalesce-large.pkt selftests/net: packetdrill: import tcp/eor, tcp/splice, tcp/ts_recent, tcp/blocking 2024-12-18 10:05:33 -08:00
tcp_eor_no-coalesce-retrans.pkt selftests/net: packetdrill: import tcp/eor, tcp/splice, tcp/ts_recent, tcp/blocking 2024-12-18 10:05:33 -08:00
tcp_eor_no-coalesce-small.pkt selftests/net: packetdrill: import tcp/eor, tcp/splice, tcp/ts_recent, tcp/blocking 2024-12-18 10:05:33 -08:00
tcp_eor_no-coalesce-subsequent.pkt selftests/net: packetdrill: import tcp/eor, tcp/splice, tcp/ts_recent, tcp/blocking 2024-12-18 10:05:33 -08:00
tcp_fast_recovery_prr-ss-10pkt-lost-1.pkt selftests/net: packetdrill: import tcp/fast_recovery, tcp/nagle, tcp/timestamping 2024-12-18 10:05:33 -08:00
tcp_fast_recovery_prr-ss-30pkt-lost-1_4-11_16.pkt selftests/net: packetdrill: import tcp/fast_recovery, tcp/nagle, tcp/timestamping 2024-12-18 10:05:33 -08:00
tcp_fast_recovery_prr-ss-30pkt-lost1_4.pkt selftests/net: packetdrill: import tcp/fast_recovery, tcp/nagle, tcp/timestamping 2024-12-18 10:05:33 -08:00
tcp_fast_recovery_prr-ss-ack-below-snd_una-cubic.pkt selftests/net: packetdrill: import tcp/fast_recovery, tcp/nagle, tcp/timestamping 2024-12-18 10:05:33 -08:00
tcp_fastopen_server_basic-cookie-not-reqd.pkt selftest: packetdrill: Import TFO server basic tests. 2025-09-29 18:41:38 -07:00
tcp_fastopen_server_basic-no-setsockopt.pkt selftest: packetdrill: Add test for TFO_SERVER_WO_SOCKOPT1. 2025-09-29 18:41:38 -07:00
tcp_fastopen_server_basic-non-tfo-listener.pkt selftest: packetdrill: Import TFO server basic tests. 2025-09-29 18:41:38 -07:00
tcp_fastopen_server_basic-pure-syn-data.pkt selftest: packetdrill: Import TFO server basic tests. 2025-09-29 18:41:38 -07:00
tcp_fastopen_server_basic-rw.pkt selftest: packetdrill: Import TFO server basic tests. 2025-09-29 18:41:38 -07:00
tcp_fastopen_server_basic-zero-payload.pkt selftest: packetdrill: Import TFO server basic tests. 2025-09-29 18:41:38 -07:00
tcp_fastopen_server_client-ack-dropped-then-recovery-ms-timestamps.pkt selftest: packetdrill: Import client-ack-dropped-then-recovery-ms-timestamps.pkt 2025-09-29 18:41:39 -07:00
tcp_fastopen_server_experimental_option.pkt selftest: packetdrill: Add test for experimental option. 2025-09-29 18:41:39 -07:00
tcp_fastopen_server_fin-close-socket.pkt selftest: packetdrill: Import opt34/fin-close-socket.pkt. 2025-09-29 18:41:39 -07:00
tcp_fastopen_server_icmp-before-accept.pkt selftest: packetdrill: Import opt34/icmp-before-accept.pkt. 2025-09-29 18:41:39 -07:00
tcp_fastopen_server_reset-after-accept.pkt selftest: packetdrill: Import opt34/reset-* tests. 2025-09-29 18:41:39 -07:00
tcp_fastopen_server_reset-before-accept.pkt selftest: packetdrill: Import opt34/reset-* tests. 2025-09-29 18:41:39 -07:00
tcp_fastopen_server_reset-close-with-unread-data.pkt selftest: packetdrill: Import opt34/reset-* tests. 2025-09-29 18:41:39 -07:00
tcp_fastopen_server_reset-non-tfo-socket.pkt selftest: packetdrill: Import opt34/reset-* tests. 2025-09-29 18:41:39 -07:00
tcp_fastopen_server_sockopt-fastopen-key.pkt selftest: packetdrill: Import sockopt-fastopen-key.pkt 2025-09-29 18:41:39 -07:00
tcp_fastopen_server_trigger-rst-listener-closed.pkt selftest: packetdrill: Import opt34/*-trigger-rst.pkt. 2025-09-29 18:41:39 -07:00
tcp_fastopen_server_trigger-rst-reconnect.pkt selftest: packetdrill: Refine tcp_fastopen_server_reset-after-disconnect.pkt. 2025-09-29 18:41:39 -07:00
tcp_fastopen_server_trigger-rst-unread-data-closed.pkt selftest: packetdrill: Import opt34/*-trigger-rst.pkt. 2025-09-29 18:41:39 -07:00
tcp_inq_client.pkt selftests/net: packetdrill: add --mss option to three tests 2025-07-11 17:01:31 -07:00
tcp_inq_server.pkt selftests/net: packetdrill: add --mss option to three tests 2025-07-11 17:01:31 -07:00
tcp_limited_transmit_limited-transmit-no-sack.pkt selftests/net: packetdrill: import tcp/user_timeout, tcp/validate, tcp/sendfile, tcp/limited-transmit, tcp/syscall_bad_arg 2024-12-18 10:05:48 -08:00
tcp_limited_transmit_limited-transmit-sack.pkt selftests/net: packetdrill: import tcp/user_timeout, tcp/validate, tcp/sendfile, tcp/limited-transmit, tcp/syscall_bad_arg 2024-12-18 10:05:48 -08:00
tcp_md5_md5-only-on-client-ack.pkt
…
tcp_nagle_https_client.pkt selftests/net: packetdrill: import tcp/fast_recovery, tcp/nagle, tcp/timestamping 2024-12-18 10:05:33 -08:00
tcp_nagle_sendmsg_msg_more.pkt selftests/net: packetdrill: import tcp/fast_recovery, tcp/nagle, tcp/timestamping 2024-12-18 10:05:33 -08:00
tcp_nagle_sockopt_cork_nodelay.pkt selftests/net: packetdrill: import tcp/fast_recovery, tcp/nagle, tcp/timestamping 2024-12-18 10:05:33 -08:00
tcp_ooo-before-and-after-accept.pkt selftests/net: packetdrill: add tcp_ooo-before-and-after-accept.pkt 2025-07-09 19:24:10 -07:00
tcp_ooo_rcv_mss.pkt selftests/net: packetdrill: add tcp_ooo_rcv_mss.pkt 2025-07-14 18:41:43 -07:00
tcp_rcv_big_endseq.pkt selftests: packetdrill: correct the expected timing in tcp_rcv_big_endseq 2025-07-16 15:05:56 -07:00
tcp_rcv_toobig.pkt selftests/net: packetdrill: add tcp_rcv_toobig.pkt 2025-07-14 18:41:43 -07:00
tcp_rto_synack_rto_max.pkt selftest: packetdrill: Add max RTO test for SYN+ACK. 2025-11-07 18:05:26 -08:00
tcp_sack_sack-route-refresh-ip-tos.pkt selftests/net: packetdrill: import tcp/ecn, tcp/close, tcp/sack, tcp/tcp_info 2024-12-18 10:05:28 -08:00
tcp_sack_sack-shift-sacked-2-6-8-3-9-nofack.pkt selftests/net: packetdrill: import tcp/ecn, tcp/close, tcp/sack, tcp/tcp_info 2024-12-18 10:05:28 -08:00
tcp_sack_sack-shift-sacked-7-3-4-8-9-fack.pkt selftests/net: packetdrill: import tcp/ecn, tcp/close, tcp/sack, tcp/tcp_info 2024-12-18 10:05:28 -08:00
tcp_sack_sack-shift-sacked-7-5-6-8-9-fack.pkt selftests/net: packetdrill: import tcp/ecn, tcp/close, tcp/sack, tcp/tcp_info 2024-12-18 10:05:28 -08:00
tcp_sendfile_sendfile-simple.pkt selftests/net: packetdrill: import tcp/user_timeout, tcp/validate, tcp/sendfile, tcp/limited-transmit, tcp/syscall_bad_arg 2024-12-18 10:05:48 -08:00
tcp_slow_start_slow-start-ack-per-1pkt.pkt selftests/net: packetdrill: import tcp/slow_start 2024-09-12 19:04:38 -07:00
tcp_slow_start_slow-start-ack-per-2pkt-send-5pkt.pkt selftests/net: packetdrill: import tcp/slow_start 2024-09-12 19:04:38 -07:00
tcp_slow_start_slow-start-ack-per-2pkt-send-6pkt.pkt selftests/net: packetdrill: import tcp/slow_start 2024-09-12 19:04:38 -07:00
tcp_slow_start_slow-start-ack-per-2pkt.pkt selftests/net: packetdrill: import tcp/slow_start 2024-09-12 19:04:38 -07:00
tcp_slow_start_slow-start-ack-per-4pkt.pkt selftests/net: packetdrill: import tcp/slow_start 2024-09-12 19:04:38 -07:00
tcp_slow_start_slow-start-after-idle.pkt selftests/net: packetdrill: import tcp/slow_start 2024-09-12 19:04:38 -07:00
tcp_slow_start_slow-start-after-win-update.pkt selftests/net: packetdrill: import tcp/slow_start 2024-09-12 19:04:38 -07:00
tcp_slow_start_slow-start-app-limited-9-packets-out.pkt selftests/net: packetdrill: import tcp/slow_start 2024-09-12 19:04:38 -07:00
tcp_slow_start_slow-start-app-limited.pkt selftests/net: packetdrill: import tcp/slow_start 2024-09-12 19:04:38 -07:00
tcp_slow_start_slow-start-fq-ack-per-2pkt.pkt selftests/net: packetdrill: import tcp/slow_start 2024-09-12 19:04:38 -07:00
tcp_splice_tcp_splice_loop_test.pkt selftests/net: packetdrill: import tcp/eor, tcp/splice, tcp/ts_recent, tcp/blocking 2024-12-18 10:05:33 -08:00
tcp_syscall_bad_arg_fastopen-invalid-buf-ptr.pkt selftests/net: packetdrill: import tcp/user_timeout, tcp/validate, tcp/sendfile, tcp/limited-transmit, tcp/syscall_bad_arg 2024-12-18 10:05:48 -08:00
tcp_syscall_bad_arg_sendmsg-empty-iov.pkt selftests/net: packetdrill: import tcp/user_timeout, tcp/validate, tcp/sendfile, tcp/limited-transmit, tcp/syscall_bad_arg 2024-12-18 10:05:48 -08:00
tcp_syscall_bad_arg_syscall-invalid-buf-ptr.pkt selftests/net: packetdrill: import tcp/user_timeout, tcp/validate, tcp/sendfile, tcp/limited-transmit, tcp/syscall_bad_arg 2024-12-18 10:05:48 -08:00
tcp_tcp_info_tcp-info-last_data_recv.pkt selftests/net: packetdrill: import tcp/ecn, tcp/close, tcp/sack, tcp/tcp_info 2024-12-18 10:05:28 -08:00
tcp_tcp_info_tcp-info-rwnd-limited.pkt selftests/net: packetdrill: import tcp/ecn, tcp/close, tcp/sack, tcp/tcp_info 2024-12-18 10:05:28 -08:00
tcp_tcp_info_tcp-info-sndbuf-limited.pkt selftests/net: packetdrill: import tcp/ecn, tcp/close, tcp/sack, tcp/tcp_info 2024-12-18 10:05:28 -08:00
tcp_timestamping_client-only-last-byte.pkt selftests/net: packetdrill: import tcp/fast_recovery, tcp/nagle, tcp/timestamping 2024-12-18 10:05:33 -08:00
tcp_timestamping_partial.pkt selftests/net: packetdrill: import tcp/fast_recovery, tcp/nagle, tcp/timestamping 2024-12-18 10:05:33 -08:00
tcp_timestamping_server.pkt selftests/net: packetdrill: import tcp/fast_recovery, tcp/nagle, tcp/timestamping 2024-12-18 10:05:33 -08:00
tcp_ts_recent_fin_tsval.pkt selftests/net: packetdrill: import tcp/eor, tcp/splice, tcp/ts_recent, tcp/blocking 2024-12-18 10:05:33 -08:00
tcp_ts_recent_invalid_ack.pkt selftests/net: packetdrill: import tcp/eor, tcp/splice, tcp/ts_recent, tcp/blocking 2024-12-18 10:05:33 -08:00
tcp_ts_recent_reset_tsval.pkt selftests/net: packetdrill: import tcp/eor, tcp/splice, tcp/ts_recent, tcp/blocking 2024-12-18 10:05:33 -08:00
tcp_user_timeout_user-timeout-probe.pkt selftests/net: packetdrill: unflake tcp_user_timeout_user-timeout-probe.pkt 2025-10-16 16:25:09 -07:00
tcp_user_timeout_user_timeout.pkt selftests/net: packetdrill: import tcp/user_timeout, tcp/validate, tcp/sendfile, tcp/limited-transmit, tcp/syscall_bad_arg 2024-12-18 10:05:48 -08:00
tcp_validate_validate-established-no-flags.pkt selftests/net: packetdrill: import tcp/user_timeout, tcp/validate, tcp/sendfile, tcp/limited-transmit, tcp/syscall_bad_arg 2024-12-18 10:05:48 -08:00
tcp_zerocopy_basic.pkt selftests/net: packetdrill: import tcp/zerocopy 2024-09-12 19:04:37 -07:00
tcp_zerocopy_batch.pkt selftests/net: packetdrill: import tcp/zerocopy 2024-09-12 19:04:37 -07:00
tcp_zerocopy_client.pkt selftests/net: packetdrill: import tcp/zerocopy 2024-09-12 19:04:37 -07:00
tcp_zerocopy_closed.pkt selftests/net: packetdrill: import tcp/zerocopy 2024-09-12 19:04:37 -07:00
tcp_zerocopy_epoll_edge.pkt selftests/net: packetdrill: import tcp/zerocopy 2024-09-12 19:04:37 -07:00
tcp_zerocopy_epoll_exclusive.pkt selftests/net: packetdrill: import tcp/zerocopy 2024-09-12 19:04:37 -07:00
tcp_zerocopy_epoll_oneshot.pkt selftests/net: packetdrill: import tcp/zerocopy 2024-09-12 19:04:37 -07:00
tcp_zerocopy_fastopen-client.pkt selftests/net: packetdrill: import tcp/zerocopy 2024-09-12 19:04:37 -07:00
tcp_zerocopy_fastopen-server.pkt selftests/net: packetdrill: import tcp/zerocopy 2024-09-12 19:04:37 -07:00
tcp_zerocopy_maxfrags.pkt selftests/net: packetdrill: import tcp/zerocopy 2024-09-12 19:04:37 -07:00
tcp_zerocopy_small.pkt selftests/net: packetdrill: import tcp/zerocopy 2024-09-12 19:04:37 -07:00