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88395c071f
Same as initial tests, import verbatim from github.com/google/packetdrill, aside from: - update `source ./defaults.sh` path to adjust for flat dir - add SPDX headers - remove author statements if any - drop blank lines at EOF 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 Signed-off-by: Willem de Bruijn <willemb@google.com> Signed-off-by: Soham Chakradeo <sohamch@google.com> Link: https://patch.msgid.link/20241217185203.297935-2-sohamch.kernel@gmail.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
63 lines
2.0 KiB
Plaintext
63 lines
2.0 KiB
Plaintext
// SPDX-License-Identifier: GPL-2.0
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// Test shifting of newly-SACKed ranges onto the previous already-SACKed skb.
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// This variant tests the case where we mark packets 0-4 lost, then
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// get a SACK for 5, and then a SACK for 6.
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`./defaults.sh`
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// Establish a connection and send 10 MSS.
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0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
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+0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
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+0 bind(3, ..., ...) = 0
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+0 listen(3, 1) = 0
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+0 < S 0:0(0) win 32792 <mss 1000,sackOK,nop,nop,nop,wscale 7>
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+0 > S. 0:0(0) ack 1 <mss 1460,nop,nop,sackOK,nop,wscale 8>
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+.1 < . 1:1(0) ack 1 win 1024
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+0 accept(3, ..., ...) = 4
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+0 write(4, ..., 10000) = 10000
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+0 > P. 1:10001(10000) ack 1
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// SACK for 7001:8001. Using RACK we delay a fast retransmit.
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+.1 < . 1:1(0) ack 1 win 257 <sack 7001:8001,nop,nop>
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+.027 > . 1:1001(1000) ack 1
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+0 %{
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assert tcpi_ca_state == TCP_CA_Recovery, tcpi_ca_state
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assert tcpi_lost == 7,tcpi_lost # RACK thinks 1:7001 are lost
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assert tcpi_reordering == 3, tcpi_reordering
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}%
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// SACK for 5001:6001.
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+0 < . 1:1(0) ack 1 win 257 <sack 5001:6001 7001:8001,nop,nop>
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+0 > . 1001:2001(1000) ack 1
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+0 %{
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assert tcpi_lost == 6, tcpi_lost
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assert tcpi_reordering == 3, tcpi_reordering # 7001:8001 -> 5001:6001 is 3
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}%
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// SACK for 6001:7001.
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// This SACK for an adjacent range causes the sender to
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// shift the newly-SACKed range onto the previous skb.
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+0 < . 1:1(0) ack 1 win 257 <sack 5001:8001,nop,nop>
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+0 > . 2001:3001(1000) ack 1
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+0 %{ assert tcpi_lost == 5, tcpi_lost }%
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// SACK for 8001:9001.
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+0 < . 1:1(0) ack 1 win 257 <sack 5001:9001,nop,nop>
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+0 > . 3001:4001(1000) ack 1
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// SACK for 9001:10001.
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+0 < . 1:1(0) ack 1 win 257 <sack 5001:10001,nop,nop>
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+0 > . 4001:5001(1000) ack 1
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// To simplify clean-up, say we get an ACK for all data.
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+.1 < . 1:1(0) ack 10001 win 257
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+0 %{
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assert tcpi_ca_state == TCP_CA_Open, tcpi_ca_state
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assert tcpi_unacked == 0, tcpi_unacked
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assert tcpi_sacked == 0, tcpi_sacked
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assert tcpi_lost == 0, tcpi_lost
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assert tcpi_retrans == 0, tcpi_retrans
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}%
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