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| author | Jakub Kicinski <kuba@kernel.org> | 2025-11-08 05:05:28 +0300 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2025-11-08 05:05:28 +0300 |
| commit | 45cb3c6fbe875e1fda037a798e4c95c43b901d17 (patch) | |
| tree | 38adf672d922c05e629401d7eba63ce63ce64b35 /tools | |
| parent | c6934c4e049c8a7f2b7fab620c04bc5dfbd947c1 (diff) | |
| parent | ffc56c90819e86d3a8c4eff6f831317d1c1476b6 (diff) | |
| download | linux-45cb3c6fbe875e1fda037a798e4c95c43b901d17.tar.xz | |
Merge branch 'tcp-clean-up-syn-ack-rto-code-and-apply-max-rto'
Kuniyuki Iwashima says:
====================
tcp: Clean up SYN+ACK RTO code and apply max RTO.
Patch 1 - 4 are misc cleanup.
Patch 5 applies max RTO to non-TFO SYN+ACK.
Patch 6 adds a test for max RTO of SYN+ACK.
====================
Link: https://patch.msgid.link/20251106003357.273403-1-kuniyu@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/testing/selftests/net/packetdrill/tcp_rto_synack_rto_max.pkt | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/tools/testing/selftests/net/packetdrill/tcp_rto_synack_rto_max.pkt b/tools/testing/selftests/net/packetdrill/tcp_rto_synack_rto_max.pkt new file mode 100644 index 000000000000..47550df124ce --- /dev/null +++ b/tools/testing/selftests/net/packetdrill/tcp_rto_synack_rto_max.pkt @@ -0,0 +1,54 @@ +// SPDX-License-Identifier: GPL-2.0 +// +// Test SYN+ACK RTX with 1s RTO. +// +`./defaults.sh + ./set_sysctls.py /proc/sys/net/ipv4/tcp_rto_max_ms=1000` + +// +// Test 1: TFO SYN+ACK +// + 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 0:10(10) win 1000 <mss 1460,sackOK,nop,nop,FO TFO_COOKIE,nop,nop> + +0 > S. 0:0(0) ack 11 <mss 1460,nop,nop,sackOK> + +// RTO must be capped to 1s + +1 > S. 0:0(0) ack 11 <mss 1460,nop,nop,sackOK> + +1 > S. 0:0(0) ack 11 <mss 1460,nop,nop,sackOK> + +1 > S. 0:0(0) ack 11 <mss 1460,nop,nop,sackOK> + + +0 < . 11:11(0) ack 1 win 1000 <mss 1460,nop,nop,sackOK> + +0 accept(3, ..., ...) = 4 + +0 %{ assert (tcpi_options & TCPI_OPT_SYN_DATA) != 0, tcpi_options }% + + +0 close(4) = 0 + +0 close(3) = 0 + + +// +// Test 2: non-TFO SYN+ACK +// + +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 < S 0:0(0) win 1000 <mss 1460,sackOK,nop,nop> + +0 > S. 0:0(0) ack 1 <mss 1460,nop,nop,sackOK> + +// RTO must be capped to 1s + +1 > S. 0:0(0) ack 1 <mss 1460,nop,nop,sackOK> + +1 > S. 0:0(0) ack 1 <mss 1460,nop,nop,sackOK> + +1 > S. 0:0(0) ack 1 <mss 1460,nop,nop,sackOK> + + +0 < . 1:1(0) ack 1 win 1000 <mss 1460,nop,nop,sackOK> + +0 accept(3, ..., ...) = 4 + +0 %{ assert (tcpi_options & TCPI_OPT_SYN_DATA) == 0, tcpi_options }% + + +0 close(4) = 0 + +0 close(3) = 0 |