Merge branch 'selftest-packetdrill-import-tfo-server-tests'

Kuniyuki Iwashima says:

====================
selftest: packetdrill: Import TFO server tests.

The series imports 15 TFO server tests from google/packetdrill and
adds 2 more tests.

The repository has two versions of tests for most scenarios; one uses
the non-experimental option (34), and the other uses the experimental
option (255) with 0xF989.

Basically, we only import the non-experimental version of tests, and
for the experimental option, tcp_fastopen_server_experimental_option.pkt
is added.

The following tests are not (yet) imported:

  * icmp-baseline.pkt
  * simple1.pkt / simple2.pkt / simple3.pkt

The former is completely covered by icmp-before-accept.pkt.

The later's delta is the src/dst IP pair to generate a different
cookie, but supporting dualstack requires churn in ksft_runner.sh,
so defered to future series.  Also, sockopt-fastopen-key.pkt covers
the same function.

The following tests have the experimental version only, so converted
to the non-experimental option:

  * client-ack-dropped-then-recovery-ms-timestamps.pkt
  * sockopt-fastopen-key.pkt

For the imported tests, these common changes are applied.

  * Add SPDX header
  * Adjust path to default.sh
  * Adjust sysctl w/ set_sysctls.py
  * Use TFO_COOKIE instead of a raw hex value
  * Use SOCK_NONBLOCK for socket() not to block accept()
  * Add assertions for TCP state if commented
  * Remove unnecessary delay (e.g. +0.1 setsockopt(SO_REUSEADDR), etc)

With this series, except for simple{1,2,3}.pkt, we can remove TFO server
tests in google/packetdrill.
====================

Link: https://patch.msgid.link/20250927213022.1850048-1-kuniyu@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

1 files changed, 26 insertions, 0 deletions

diff --git a/tools/testing/selftests/net/packetdrill/tcp_fastopen_server_basic-zero-payload.pkt b/tools/testing/selftests/net/packetdrill/tcp_fastopen_server_basic-zero-payload.pkt
new file mode 100644
index 000000000000..95b1047ffdd5
--- /dev/null
+++ b/tools/testing/selftests/net/packetdrill/tcp_fastopen_server_basic-zero-payload.pkt
@@ -0,0 +1,26 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// Basic TFO server test
+//
+// Test zero-payload packet w/ valid TFO cookie - a TFO socket will
+// still be created and accepted but read() will not return until a
+// later pkt with 10 byte.
+
+`./defaults.sh`
+
+    0 socket(..., SOCK_STREAM|SOCK_NONBLOCK, IPPROTO_TCP) = 3
+   +0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
+   +0 bind(3, ..., ...) = 0
+   +0 listen(3, 1) = 0
+   +0 setsockopt(3, SOL_TCP, TCP_FASTOPEN, [1], 4) = 0
+
+   +0 < S 0:0(0) win 32792 <mss 1460,sackOK,nop,nop,FO TFO_COOKIE,nop,nop>
+   +0 > S. 0:0(0) ack 1 <mss 1460,nop,nop,sackOK>
+   +0 accept(3, ..., ...) = 4
+   +0 %{ assert (tcpi_options & TCPI_OPT_SYN_DATA) == 0, tcpi_options }%
+
+// A TFO socket is created and is writable.
+   +0 write(4, ..., 100) = 100
+   +0 > P. 1:101(100) ack 1
+   +0...0.300 read(4, ..., 512) = 10
+  +.3 < P. 1:11(10) ack 1 win 5840