Commit e874be27 authored by Willem de Bruijn's avatar Willem de Bruijn Committed by Jakub Kicinski
Browse files

selftests/net: packetdrill: import tcp/slow_start

Same import process as previous tests.

Also add CONFIG_NET_SCH_FQ to config, as one test uses that.

Same test process as previous tests. Both with and without debug mode.
Recording the steps once:

make mrproper
vng --build \
        --config tools/testing/selftests/net/packetdrill/config \
        --config kernel/configs/debug.config
vng -v --run . --user root --cpus 4 -- \
	make -C tools/testing/selftests TARGETS=net/packetdrill run_tests

Link: https://github.com/linux-netdev/nipa/wiki/How-to-run-netdev-selftests-CI-style#how-to-build


Signed-off-by: default avatarWillem de Bruijn <willemb@google.com>
Acked-by: default avatarMatthieu Baerts (NGI0) <matttbe@kernel.org>
Link: https://patch.msgid.link/20240912005317.1253001-4-willemdebruijn.kernel@gmail.com


Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent 1e42f73f
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+1 −0
Original line number Diff line number Diff line
@@ -3,6 +3,7 @@ CONFIG_HZ_1000=y
CONFIG_HZ=1000
CONFIG_NET_NS=y
CONFIG_NET_SCH_FIFO=y
CONFIG_NET_SCH_FQ=y
CONFIG_PROC_SYSCTL=y
CONFIG_SYN_COOKIES=y
CONFIG_TCP_CONG_CUBIC=y
+56 −0
Original line number Diff line number Diff line
// SPDX-License-Identifier: GPL-2.0
// Test of slow start when not application-limited, so that
// the cwnd continues to grow.
// In this variant, the receiver ACKs every packet.

// Set up config. To keep things simple, disable the
// mechanism that defers sending in order to send bigger TSO packets.
`./defaults.sh
sysctl -q net.ipv4.tcp_tso_win_divisor=100`

    0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
   +0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
   +0 bind(3, ..., ...) = 0
   +0 listen(3, 1) = 0

  +.1 < S 0:0(0) win 32792 <mss 1000,sackOK,nop,nop,nop,wscale 7>
   +0 > S. 0:0(0) ack 1 <mss 1460,nop,nop,sackOK,nop,wscale 8>
  +.1 < . 1:1(0) ack 1 win 257
   +0 accept(3, ..., ...) = 4
   +0 setsockopt(4, SOL_SOCKET, SO_SNDBUF, [200000], 4) = 0

   +0 write(4, ..., 30000) = 30000
   +0 > P. 1:10001(10000) ack 1
   +0 %{ assert tcpi_snd_cwnd == 10, tcpi_snd_cwnd }%

+.105 < . 1:1(0) ack 1001 win 257
   +0 > P. 10001:12001(2000) ack 1

   +0 < . 1:1(0) ack 2001 win 257
   +0 > P. 12001:14001(2000) ack 1

+.005 < . 1:1(0) ack 3001 win 257
   +0 > P. 14001:16001(2000) ack 1

   +0 < . 1:1(0) ack 4001 win 257
   +0 > P. 16001:18001(2000) ack 1

+.005 < . 1:1(0) ack 5001 win 257
   +0 > P. 18001:20001(2000) ack 1

   +0 < . 1:1(0) ack 6001 win 257
   +0 > P. 20001:22001(2000) ack 1

+.005 < . 1:1(0) ack 7001 win 257
   +0 > P. 22001:24001(2000) ack 1

   +0 < . 1:1(0) ack 8001 win 257
   +0 > P. 24001:26001(2000) ack 1

+.005 < . 1:1(0) ack 9001 win 257
   +0 > P. 26001:28001(2000) ack 1

   +0 < . 1:1(0) ack 10001 win 257
   +0 > P. 28001:30001(2000) ack 1

   +0 %{ assert tcpi_snd_cwnd == 20, tcpi_snd_cwnd }%
+33 −0
Original line number Diff line number Diff line
// SPDX-License-Identifier: GPL-2.0
// Test of slow start when an outstanding flight of packets is
// less than the current cwnd, and not big enough to bump up cwnd.
//
// In this variant, the receiver ACKs every other packet,
// approximating standard delayed ACKs.

// Set up config.
`./defaults.sh`

    0 socket(..., SOCK_STREAM, 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 32792 <mss 1000,sackOK,nop,nop,nop,wscale 7>
   +0 > S. 0:0(0) ack 1 <mss 1460,nop,nop,sackOK,nop,wscale 8>
   +0 < . 1:1(0) ack 1 win 257
   +0 accept(3, ..., ...) = 4

// Only send 5 packets.
   +0 write(4, ..., 5000) = 5000
   +0 > P. 1:5001(5000) ack 1
   +0 %{ assert tcpi_snd_cwnd == 10, tcpi_snd_cwnd }%

   +0 < . 1:1(0) ack 2001 win 257
   +0 %{ assert tcpi_snd_cwnd == 10, 'cwnd=%d' % tcpi_snd_cwnd }%

   +0 < . 1:1(0) ack 4001 win 257
   +0 %{ assert tcpi_snd_cwnd == 10, 'cwnd=%d' % tcpi_snd_cwnd }%

   +0 < . 1:1(0) ack 5001 win 257
   +0 %{ assert tcpi_snd_cwnd == 10, 'cwnd=%d' % tcpi_snd_cwnd }%
+34 −0
Original line number Diff line number Diff line
// SPDX-License-Identifier: GPL-2.0
// Test of slow start when an outstanding flight of packets is
// less than the current cwnd, but still big enough that in slow
// start we want to increase our cwnd a little.
//
// In this variant, the receiver ACKs every other packet,
// approximating standard delayed ACKs.

// Set up config.
`./defaults.sh`

    0 socket(..., SOCK_STREAM, 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 32792 <mss 1000,sackOK,nop,nop,nop,wscale 7>
   +0 > S. 0:0(0) ack 1 <mss 1460,nop,nop,sackOK,nop,wscale 8>
   +0 < . 1:1(0) ack 1 win 257
   +0 accept(3, ..., ...) = 4

// Only send 6 packets.
   +0 write(4, ..., 6000) = 6000
   +0 > P. 1:6001(6000) ack 1
   +0 %{ assert tcpi_snd_cwnd == 10, tcpi_snd_cwnd }%

   +0 < . 1:1(0) ack 2001 win 257
   +0 %{ assert tcpi_snd_cwnd == 12, 'cwnd=%d' % tcpi_snd_cwnd }%

   +0 < . 1:1(0) ack 4001 win 257
   +0 %{ assert tcpi_snd_cwnd == 12, 'cwnd=%d' % tcpi_snd_cwnd }%

   +0 < . 1:1(0) ack 6001 win 257
   +0 %{ assert tcpi_snd_cwnd == 12, 'cwnd=%d' % tcpi_snd_cwnd }%
+42 −0
Original line number Diff line number Diff line
// SPDX-License-Identifier: GPL-2.0
// Test of slow start when not application-limited, so that
// the cwnd continues to grow.
// In this variant, the receiver ACKs every other packet,
// approximating standard delayed ACKs.

// Set up config. To keep things simple, disable the
// mechanism that defers sending in order to send bigger TSO packets.
`./defaults.sh
sysctl -q net.ipv4.tcp_tso_win_divisor=100`

    0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
   +0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
   +0 bind(3, ..., ...) = 0
   +0 listen(3, 1) = 0

  +.1 < S 0:0(0) win 32792 <mss 1000,sackOK,nop,nop,nop,wscale 7>
   +0 > S. 0:0(0) ack 1 <mss 1460,nop,nop,sackOK,nop,wscale 8>
  +.1 < . 1:1(0) ack 1 win 257
   +0 accept(3, ..., ...) = 4
   +0 setsockopt(4, SOL_SOCKET, SO_SNDBUF, [200000], 4) = 0

   +0 write(4, ..., 30000) = 30000
   +0 > P. 1:10001(10000) ack 1
   +0 %{ assert tcpi_snd_cwnd == 10, tcpi_snd_cwnd }%

+.105 < . 1:1(0) ack 2001 win 257
   +0 > P. 10001:14001(4000) ack 1

+.005 < . 1:1(0) ack 4001 win 257
   +0 > P. 14001:18001(4000) ack 1

+.005 < . 1:1(0) ack 6001 win 257
   +0 > P. 18001:22001(4000) ack 1

+.005 < . 1:1(0) ack 8001 win 257
   +0 > P. 22001:26001(4000) ack 1

+.005 < . 1:1(0) ack 10001 win 257
   +0 > P. 26001:30001(4000) ack 1

   +0 %{ assert tcpi_snd_cwnd == 20, tcpi_snd_cwnd }%
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