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

tools/testing/selftests/net/packetdrill/config

+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

tools/testing/selftests/net/packetdrill/tcp_slow_start_slow-start-ack-per-1pkt.pkt

0 → 100644
+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 }%

tools/testing/selftests/net/packetdrill/tcp_slow_start_slow-start-ack-per-2pkt-send-5pkt.pkt

0 → 100644
+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 }%

tools/testing/selftests/net/packetdrill/tcp_slow_start_slow-start-ack-per-2pkt-send-6pkt.pkt

0 → 100644
+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 }%

tools/testing/selftests/net/packetdrill/tcp_slow_start_slow-start-ack-per-2pkt.pkt

0 → 100644
+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 }%