netdev - [PATCH v1 net-next 0/4] tcp: Refine TFO client fallback behaviour.

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Message-ID: <20251016040159.3534435-1-kuniyu@google.com>
Date: Thu, 16 Oct 2025 04:00:32 +0000
From: Kuniyuki Iwashima <kuniyu@...gle.com>
To: Eric Dumazet <edumazet@...gle.com>, Neal Cardwell <ncardwell@...gle.com>, 
	"David S. Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>
Cc: Simon Horman <horms@...nel.org>, Yuchung Cheng <ycheng@...gle.com>, 
	Willem de Bruijn <willemb@...gle.com>, Kuniyuki Iwashima <kuniyu@...gle.com>, 
	Kuniyuki Iwashima <kuni1840@...il.com>, netdev@...r.kernel.org
Subject: [PATCH v1 net-next 0/4] tcp: Refine TFO client fallback behaviour.

Patch 1 & 3 refine weird TFO fallback behaviours that
I found while importing TFO client packetdrill tests from
google/packetdrill on GitHub.

Patch 2 & 4 import packetdrill tests to cover Patch 1 & 3
scenarios respectively.

For the imported tests, these common changes are applied:

  * Add SPDX header
  * Adjust path to default.sh
  * Adjust sysctl w/ set_sysctls.py
  * Use SOCK_NONBLOCK for socket() instead of fcntl()
  * Remove unnecessary delay (e.g. +.17 socket(...), etc)

Kuniyuki Iwashima (4):
  tcp: Make TFO client fallback behaviour consistent.
  selftest: packetdrill: Import TFO sendto tests.
  tcp: Don't acknowledge SYN+ACK payload to TFO fallback client.
  selftest: packetdrill: Import client_synack-data.pkt.

 net/ipv4/tcp_input.c                          |  17 +-
 net/ipv4/tcp_output.c                         |  39 ++---
 ...en_client_nonblocking-sendto-empty-buf.pkt |  45 ++++++
 ...topen_client_nonblocking-sendto-errnos.pkt | 125 +++++++++++++++
 .../tcp_fastopen_client_synack-data.pkt       | 150 ++++++++++++++++++
 5 files changed, 350 insertions(+), 26 deletions(-)
 create mode 100644 tools/testing/selftests/net/packetdrill/tcp_fastopen_client_nonblocking-sendto-empty-buf.pkt
 create mode 100644 tools/testing/selftests/net/packetdrill/tcp_fastopen_client_nonblocking-sendto-errnos.pkt
 create mode 100644 tools/testing/selftests/net/packetdrill/tcp_fastopen_client_synack-data.pkt

-- 
2.51.0.788.g6d19910ace-goog