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[104.199.175.148]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-218a1dbb079sm62307715ad.31.2024.12.17.10.52.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 17 Dec 2024 10:52:12 -0800 (PST) From: Soham Chakradeo To: netdev@vger.kernel.org Cc: davem@davemloft.net, kuba@kernel.org, edumazet@google.com, pabeni@redhat.com, linux-kselftest@vger.kernel.org, Soham Chakradeo , Willem de Bruijn Subject: [PATCH net-next 1/4] selftests/net: packetdrill: import tcp/ecn, tcp/close, tcp/sack, tcp/tcp_info Date: Tue, 17 Dec 2024 18:51:58 +0000 Message-ID: <20241217185203.297935-2-sohamch.kernel@gmail.com> X-Mailer: git-send-email 2.47.1.613.gc27f4b7a9f-goog In-Reply-To: <20241217185203.297935-1-sohamch.kernel@gmail.com> References: <20241217185203.297935-1-sohamch.kernel@gmail.com> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Soham Chakradeo 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 Signed-off-by: Soham Chakradeo --- ...lose_close-local-close-then-remote-fin.pkt | 23 +++++++ .../tcp_close_close-on-syn-sent.pkt | 21 ++++++ .../tcp_close_close-remote-fin-then-close.pkt | 36 ++++++++++ .../net/packetdrill/tcp_ecn_ecn-uses-ect0.pkt | 21 ++++++ .../tcp_sack_sack-route-refresh-ip-tos.pkt | 37 +++++++++++ ...ack_sack-shift-sacked-2-6-8-3-9-nofack.pkt | 64 ++++++++++++++++++ ..._sack_sack-shift-sacked-7-3-4-8-9-fack.pkt | 66 +++++++++++++++++++ ..._sack_sack-shift-sacked-7-5-6-8-9-fack.pkt | 62 +++++++++++++++++ .../tcp_tcp_info_tcp-info-last_data_recv.pkt | 21 ++++++ .../tcp_tcp_info_tcp-info-rwnd-limited.pkt | 54 +++++++++++++++ .../tcp_tcp_info_tcp-info-sndbuf-limited.pkt | 39 +++++++++++ 11 files changed, 444 insertions(+) create mode 100644 tools/testing/selftests/net/packetdrill/tcp_close_close-local-close-then-remote-fin.pkt create mode 100644 tools/testing/selftests/net/packetdrill/tcp_close_close-on-syn-sent.pkt create mode 100644 tools/testing/selftests/net/packetdrill/tcp_close_close-remote-fin-then-close.pkt create mode 100644 tools/testing/selftests/net/packetdrill/tcp_ecn_ecn-uses-ect0.pkt create mode 100644 tools/testing/selftests/net/packetdrill/tcp_sack_sack-route-refresh-ip-tos.pkt create mode 100644 tools/testing/selftests/net/packetdrill/tcp_sack_sack-shift-sacked-2-6-8-3-9-nofack.pkt create mode 100644 tools/testing/selftests/net/packetdrill/tcp_sack_sack-shift-sacked-7-3-4-8-9-fack.pkt create mode 100644 tools/testing/selftests/net/packetdrill/tcp_sack_sack-shift-sacked-7-5-6-8-9-fack.pkt create mode 100644 tools/testing/selftests/net/packetdrill/tcp_tcp_info_tcp-info-last_data_recv.pkt create mode 100644 tools/testing/selftests/net/packetdrill/tcp_tcp_info_tcp-info-rwnd-limited.pkt create mode 100644 tools/testing/selftests/net/packetdrill/tcp_tcp_info_tcp-info-sndbuf-limited.pkt diff --git a/tools/testing/selftests/net/packetdrill/tcp_close_close-local-close-then-remote-fin.pkt b/tools/testing/selftests/net/packetdrill/tcp_close_close-local-close-then-remote-fin.pkt new file mode 100644 index 000000000000..8514d6bdbb6d --- /dev/null +++ b/tools/testing/selftests/net/packetdrill/tcp_close_close-local-close-then-remote-fin.pkt @@ -0,0 +1,23 @@ +// SPDX-License-Identifier: GPL-2.0 +// Test basic connection teardown where local process closes first: +// the local process calls close() first, so we send a FIN, and receive an ACK. +// Then we receive a FIN and ACK it. + +`./defaults.sh` + + 0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 + +.01...0.011 connect(3, ..., ...) = 0 + +0 > S 0:0(0) <...> + +0 < S. 0:0(0) ack 1 win 32768 + +0 > . 1:1(0) ack 1 + + +0 write(3, ..., 1000) = 1000 + +0 > P. 1:1001(1000) ack 1 + +0 < . 1:1(0) ack 1001 win 257 + + +0 close(3) = 0 + +0 > F. 1001:1001(0) ack 1 + +0 < . 1:1(0) ack 1002 win 257 + + +0 < F. 1:1(0) ack 1002 win 257 + +0 > . 1002:1002(0) ack 2 diff --git a/tools/testing/selftests/net/packetdrill/tcp_close_close-on-syn-sent.pkt b/tools/testing/selftests/net/packetdrill/tcp_close_close-on-syn-sent.pkt new file mode 100644 index 000000000000..04103134bd99 --- /dev/null +++ b/tools/testing/selftests/net/packetdrill/tcp_close_close-on-syn-sent.pkt @@ -0,0 +1,21 @@ +// SPDX-License-Identifier: GPL-2.0 +// Test to make sure no RST is being sent when close() +// is called on a socket with SYN_SENT state. + +`./defaults.sh` + + 0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 + +0 fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0 + + +0 connect(3, ..., ...) = -1 EINPROGRESS (Operation now in progress) + +0 > S 0:0(0) <...> + +// Application decideds to close the socket in SYN_SENT state +// Make sure no RST is sent after close(). + +0 close(3) = 0 + +// Receive syn-ack to trigger the send side packet examination: +// If a RESET were sent right after close(), it would have failed with +// a mismatched timestamp. + +.1 < S. 0:0(0) ack 1 win 32000 + +0 > R 1:1(0) diff --git a/tools/testing/selftests/net/packetdrill/tcp_close_close-remote-fin-then-close.pkt b/tools/testing/selftests/net/packetdrill/tcp_close_close-remote-fin-then-close.pkt new file mode 100644 index 000000000000..5f3a2914213a --- /dev/null +++ b/tools/testing/selftests/net/packetdrill/tcp_close_close-remote-fin-then-close.pkt @@ -0,0 +1,36 @@ +// SPDX-License-Identifier: GPL-2.0 +// Verify behavior for the sequence: remote side sends FIN, then we close(). +// Since the remote side (client) closes first, we test our LAST_ACK code path. + +`./defaults.sh` + +// Initialize a server socket. + 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 + +0 > S. 0:0(0) ack 1 + +0 < . 1:1(0) ack 1 win 257 + + +0 accept(3, ..., ...) = 4 + +// Client closes first. + +.01 < F. 1:1(0) ack 1 win 257 + +0 > . 1:1(0) ack 2 + +// App notices that client closed. + +0 read(4, ..., 1000) = 0 + +// Then we close. + +.01 close(4) = 0 + +0 > F. 1:1(0) ack 2 + +// Client ACKs our FIN. + +.01 < . 2:2(0) ack 2 win 257 + +// Verify that we send RST in response to any incoming segments +// (because the kernel no longer has any record of this socket). + +.01 < . 2:2(0) ack 2 win 257 + +0 > R 2:2(0) diff --git a/tools/testing/selftests/net/packetdrill/tcp_ecn_ecn-uses-ect0.pkt b/tools/testing/selftests/net/packetdrill/tcp_ecn_ecn-uses-ect0.pkt new file mode 100644 index 000000000000..643baf3267cf --- /dev/null +++ b/tools/testing/selftests/net/packetdrill/tcp_ecn_ecn-uses-ect0.pkt @@ -0,0 +1,21 @@ +// SPDX-License-Identifier: GPL-2.0 +// Test ECN: verify that Linux TCP ECN sending code uses ECT0 (not ECT1). +// +`./defaults.sh +sysctl -q net.ipv4.tcp_ecn=1 # fully enabled +` + +// Initialize connection + 0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 4 + +// ECN handshake: send EW flags in SYN packet, E flag in SYN-ACK response ++.002 ... 0.004 connect(4, ..., ...) = 0 + + +0 > SEW 0:0(0) ++.002 < SE. 0:0(0) ack 1 win 32767 + +0 > . 1:1(0) ack 1 + +// Write 1 MSS. ++.002 write(4, ..., 1000) = 1000 +// Send 1 MSS with ect0. + +0 > [ect0] P. 1:1001(1000) ack 1 diff --git a/tools/testing/selftests/net/packetdrill/tcp_sack_sack-route-refresh-ip-tos.pkt b/tools/testing/selftests/net/packetdrill/tcp_sack_sack-route-refresh-ip-tos.pkt new file mode 100644 index 000000000000..310ef31518da --- /dev/null +++ b/tools/testing/selftests/net/packetdrill/tcp_sack_sack-route-refresh-ip-tos.pkt @@ -0,0 +1,37 @@ +// SPDX-License-Identifier: GPL-2.0 +// Verify that setsockopt calls that force a route refresh do not +// cause problems matching SACKs with packets in the write queue. +// This variant tests IP_TOS. + +`./defaults.sh` + +// Establish a connection. + 0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 + +0 setsockopt(3, SOL_IP, IP_MTU_DISCOVER, [IP_PMTUDISC_DONT], 1) = 0 + +0...0.010 connect(3, ..., ...) = 0 + + +0 > S 0:0(0) + +.01 < S. 0:0(0) ack 1 win 65535 + +0 > . 1:1(0) ack 1 + + +.01 write(3, ..., 5840) = 5840 + +0 > P. 1:5841(5840) ack 1 + +.01 < . 1:1(0) ack 5841 win 65535 + + +.01 write(3, ..., 5840) = 5840 + +0 > P. 5841:11681(5840) ack 1 + +.01 < . 1:1(0) ack 11681 win 65535 + + +.01 write(3, ..., 14600) = 14600 + +0 > P. 11681:26281(14600) ack 1 + +// Try the socket option that we know can force a route refresh. + +0 setsockopt(3, SOL_IP, IP_TOS, [4], 1) = 0 +// Then revert to avoid routing/mangling/etc implications of that setting. + +0 setsockopt(3, SOL_IP, IP_TOS, [0], 1) = 0 + +// Verify that we do not retransmit the SACKed segments. + +.01 < . 1:1(0) ack 13141 win 65535 + +0 > . 13141:16061(2920) ack 1 + +0 > P. 17521:20441(2920) ack 1 + +.01 < . 1:1(0) ack 26281 win 65535 diff --git a/tools/testing/selftests/net/packetdrill/tcp_sack_sack-shift-sacked-2-6-8-3-9-nofack.pkt b/tools/testing/selftests/net/packetdrill/tcp_sack_sack-shift-sacked-2-6-8-3-9-nofack.pkt new file mode 100644 index 000000000000..f185e1ac57ea --- /dev/null +++ b/tools/testing/selftests/net/packetdrill/tcp_sack_sack-shift-sacked-2-6-8-3-9-nofack.pkt @@ -0,0 +1,64 @@ +// SPDX-License-Identifier: GPL-2.0 +// Test shifting of newly-SACKed ranges onto the previous already-SACKed skb. +// This variant tests non-FACK SACK with SACKs coming in the order +// 2 6 8 3 9, to test what happens when we get a new SACKed range +// (for packet 3) that is on the right of an existing SACKed range +// (for packet 2). + +`./defaults.sh` + +// Establish a connection and send 10 MSS. + 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 + +0 > S. 0:0(0) ack 1 + +.1 < . 1:1(0) ack 1 win 1024 + +0 accept(3, ..., ...) = 4 + + +0 write(4, ..., 10000) = 10000 + +0 > P. 1:10001(10000) ack 1 + + +.1 < . 1:1(0) ack 1 win 257 ++.001 < . 1:1(0) ack 1 win 257 ++.001 < . 1:1(0) ack 1 win 257 + +// 3 SACKed packets, so we enter Fast Recovery. + +0 > . 1:1001(1000) ack 1 + +0 %{ assert tcpi_ca_state == TCP_CA_Recovery, tcpi_ca_state }% + +0 %{ assert tcpi_lost == 6, tcpi_lost }% + +// SACK for 3001:4001. +// This SACK for an adjacent range causes the sender to +// shift the newly-SACKed range onto the previous skb. ++.007 < . 1:1(0) ack 1 win 257 + +0 > . 1001:2001(1000) ack 1 + +0 %{ assert tcpi_lost == 5, tcpi_lost }% + +0 %{ assert tcpi_reordering == 6, tcpi_reordering }% // 8001:9001 -> 3001:4001 is 6 + +// SACK for 9001:10001. + +.01 < . 1:1(0) ack 1 win 257 + +0 %{ assert tcpi_lost == 5, tcpi_lost }% + +// ACK for 1:1001 as packets from t=0.303 arrive. ++.083 < . 1:1(0) ack 1001 win 257 + +0 %{ assert tcpi_lost == 4,tcpi_lost }% + +// ACK for 1:4001 as packets from t=0.310 arrive. ++.017 < . 1:1(0) ack 4001 win 257 + +0 %{ assert tcpi_lost == 3,tcpi_lost }% + +// ACK for 1:7001 as packets from t=0.320 arrive. + +.01 < . 1:1(0) ack 7001 win 257 + +// ACK for all data as packets from t=0.403 arrive. + +.1 < . 1:1(0) ack 10001 win 257 + +0 %{ +assert tcpi_ca_state == TCP_CA_Open, tcpi_ca_state +assert tcpi_unacked == 0, tcpi_unacked +assert tcpi_sacked == 0, tcpi_sacked +assert tcpi_lost == 0, tcpi_lost +assert tcpi_retrans == 0, tcpi_retrans +}% diff --git a/tools/testing/selftests/net/packetdrill/tcp_sack_sack-shift-sacked-7-3-4-8-9-fack.pkt b/tools/testing/selftests/net/packetdrill/tcp_sack_sack-shift-sacked-7-3-4-8-9-fack.pkt new file mode 100644 index 000000000000..0093b4973934 --- /dev/null +++ b/tools/testing/selftests/net/packetdrill/tcp_sack_sack-shift-sacked-7-3-4-8-9-fack.pkt @@ -0,0 +1,66 @@ +// SPDX-License-Identifier: GPL-2.0 +// Test shifting of newly-SACKed ranges onto the previous already-SACKed skb. +// This variant tests the case where we mark packets 0-4 lost, then +// get a SACK for 3, and then a SACK for 4. + +`./defaults.sh` + +// Establish a connection and send 10 MSS. + 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 + +0 > S. 0:0(0) ack 1 + +.1 < . 1:1(0) ack 1 win 1024 + +0 accept(3, ..., ...) = 4 + + +0 write(4, ..., 10000) = 10000 + +0 > P. 1:10001(10000) ack 1 + +// SACK for 7001:8001. Using RACK we delay the fast retransmit. + +.1 < . 1:1(0) ack 1 win 257 +// RACK reordering timer ++.027 > . 1:1001(1000) ack 1 + +0 %{ +assert tcpi_ca_state == TCP_CA_Recovery, tcpi_ca_state +assert tcpi_lost == 7, tcpi_lost # RACK thinks 1:7001 are lost +assert tcpi_reordering == 3, tcpi_reordering +}% + +// SACK for 3001:4001. ++.002 < . 1:1(0) ack 1 win 257 + +0 > . 1001:2001(1000) ack 1 + +0 %{ +assert tcpi_lost == 6, tcpi_lost # since 3001:4001 is no longer lost +assert tcpi_reordering == 5, tcpi_reordering # 7001:8001 -> 3001:4001 +}% + +// SACK for 4001:5001. +// This SACK for an adjacent range causes the sender to +// shift the newly-SACKed range onto the previous skb. +// It uses the RFC3517 algorithm to mark 1:3001 lost +// because >=3 higher-sequence packets are SACKed. ++.002 < . 1:1(0) ack 1 win 257 + +0 > . 2001:3001(1000) ack 1 + +0 %{ +assert tcpi_lost == 5,tcpi_lost # SACK/RFC3517 thinks 1:3001 are lost +}% + +// SACK for 8001:9001. ++.002 < . 1:1(0) ack 1 win 257 + +// SACK for 9001:10001. ++.002 < . 1:1(0) ack 1 win 257 + +0 > . 5001:6001(1000) ack 1 + +// To simplify clean-up, say we get an ACK for all data. + +.1 < . 1:1(0) ack 10001 win 257 + +0 %{ +assert tcpi_ca_state == TCP_CA_Open, tcpi_ca_state +assert tcpi_unacked == 0, tcpi_unacked +assert tcpi_sacked == 0, tcpi_sacked +assert tcpi_lost == 0, tcpi_lost +assert tcpi_retrans == 0, tcpi_retrans +}% diff --git a/tools/testing/selftests/net/packetdrill/tcp_sack_sack-shift-sacked-7-5-6-8-9-fack.pkt b/tools/testing/selftests/net/packetdrill/tcp_sack_sack-shift-sacked-7-5-6-8-9-fack.pkt new file mode 100644 index 000000000000..980a832dc81c --- /dev/null +++ b/tools/testing/selftests/net/packetdrill/tcp_sack_sack-shift-sacked-7-5-6-8-9-fack.pkt @@ -0,0 +1,62 @@ +// SPDX-License-Identifier: GPL-2.0 +// Test shifting of newly-SACKed ranges onto the previous already-SACKed skb. +// This variant tests the case where we mark packets 0-4 lost, then +// get a SACK for 5, and then a SACK for 6. + +`./defaults.sh` + +// Establish a connection and send 10 MSS. + 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 + +0 > S. 0:0(0) ack 1 + +.1 < . 1:1(0) ack 1 win 1024 + +0 accept(3, ..., ...) = 4 + + +0 write(4, ..., 10000) = 10000 + +0 > P. 1:10001(10000) ack 1 + +// SACK for 7001:8001. Using RACK we delay a fast retransmit. + +.1 < . 1:1(0) ack 1 win 257 ++.027 > . 1:1001(1000) ack 1 + +0 %{ +assert tcpi_ca_state == TCP_CA_Recovery, tcpi_ca_state +assert tcpi_lost == 7,tcpi_lost # RACK thinks 1:7001 are lost +assert tcpi_reordering == 3, tcpi_reordering +}% + +// SACK for 5001:6001. + +0 < . 1:1(0) ack 1 win 257 + +0 > . 1001:2001(1000) ack 1 + +0 %{ +assert tcpi_lost == 6, tcpi_lost +assert tcpi_reordering == 3, tcpi_reordering # 7001:8001 -> 5001:6001 is 3 +}% + +// SACK for 6001:7001. +// This SACK for an adjacent range causes the sender to +// shift the newly-SACKed range onto the previous skb. + +0 < . 1:1(0) ack 1 win 257 + +0 > . 2001:3001(1000) ack 1 + +0 %{ assert tcpi_lost == 5, tcpi_lost }% + +// SACK for 8001:9001. + +0 < . 1:1(0) ack 1 win 257 + +0 > . 3001:4001(1000) ack 1 + +// SACK for 9001:10001. + +0 < . 1:1(0) ack 1 win 257 + +0 > . 4001:5001(1000) ack 1 + +// To simplify clean-up, say we get an ACK for all data. + +.1 < . 1:1(0) ack 10001 win 257 + +0 %{ +assert tcpi_ca_state == TCP_CA_Open, tcpi_ca_state +assert tcpi_unacked == 0, tcpi_unacked +assert tcpi_sacked == 0, tcpi_sacked +assert tcpi_lost == 0, tcpi_lost +assert tcpi_retrans == 0, tcpi_retrans +}% diff --git a/tools/testing/selftests/net/packetdrill/tcp_tcp_info_tcp-info-last_data_recv.pkt b/tools/testing/selftests/net/packetdrill/tcp_tcp_info_tcp-info-last_data_recv.pkt new file mode 100644 index 000000000000..2e616ee00f5f --- /dev/null +++ b/tools/testing/selftests/net/packetdrill/tcp_tcp_info_tcp-info-last_data_recv.pkt @@ -0,0 +1,21 @@ +// SPDX-License-Identifier: GPL-2.0 +// Test tcpi_last_data_recv for active session +`./defaults.sh` + +// Create a socket and set it to non-blocking. ++0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 ++0 fcntl(3, F_GETFL) = 0x2 (flags O_RDWR) ++0 fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0 + ++0 connect(3, ..., ...) = -1 EINPROGRESS (Operation now in progress) ++0 > S 0:0(0) ++.030 < S. 0:0(0) ack 1 win 10000 ++0 > . 1:1(0) ack 1 + ++1 %{ assert 990 <= tcpi_last_data_recv <= 1010, tcpi_last_data_recv }% + ++0 < . 1:1001(1000) ack 1 win 300 ++0 > . 1:1(0) ack 1001 + ++0 %{ assert tcpi_last_data_recv <= 10, tcpi_last_data_recv }% + diff --git a/tools/testing/selftests/net/packetdrill/tcp_tcp_info_tcp-info-rwnd-limited.pkt b/tools/testing/selftests/net/packetdrill/tcp_tcp_info_tcp-info-rwnd-limited.pkt new file mode 100644 index 000000000000..a9bcd46f6cb6 --- /dev/null +++ b/tools/testing/selftests/net/packetdrill/tcp_tcp_info_tcp-info-rwnd-limited.pkt @@ -0,0 +1,54 @@ +// SPDX-License-Identifier: GPL-2.0 +// Test rwnd limited time in tcp_info for client side. + +`./defaults.sh` + +// Create a socket and set it to non-blocking. + 0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 + +0 fcntl(3, F_GETFL) = 0x2 (flags O_RDWR) + +0 fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0 + + +0 connect(3, ..., ...) = -1 EINPROGRESS (Operation now in progress) + +0 > S 0:0(0) + +// Server advertises 0 receive window. + +.01 < S. 0:0(0) ack 1 win 0 + + +0 > . 1:1(0) ack 1 + +0 getsockopt(3, SOL_SOCKET, SO_ERROR, [0], [4]) = 0 + +0 fcntl(3, F_SETFL, O_RDWR) = 0 // set back to blocking + +// Make sure that initial rwnd limited time is 0. + +0 %{ assert tcpi_rwnd_limited == 0, tcpi_rwnd_limited }% + +// Receive window limited time starts here. + +0 write(3, ..., 1000) = 1000 + +// Check that rwnd limited time in tcp_info is around 0.1s. + +.1 %{ assert 98000 <= tcpi_rwnd_limited <= 110000, tcpi_rwnd_limited }% + +// Server opens the receive window. + +.1 < . 1:1(0) ack 1 win 2000 + +// Check that rwnd limited time in tcp_info is around 0.2s. + +0 %{ assert 198000 <= tcpi_rwnd_limited <= 210000, tcpi_rwnd_limited }% + + +0 > P. 1:1001(1000) ack 1 + +// Server advertises a very small receive window. + +.03 < . 1:1(0) ack 1001 win 10 + +// Receive window limited time starts again. + +0 write(3, ..., 1000) = 1000 + +// Server opens the receive window again. + +.1 < . 1:1(0) ack 1001 win 2000 +// Check that rwnd limited time in tcp_info is around 0.3s +// and busy time is 0.3 + 0.03 (server opened small window temporarily). + +0 %{ assert 298000 <= tcpi_rwnd_limited <= 310000, tcpi_rwnd_limited;\ + assert 328000 <= tcpi_busy_time <= 340000, tcpi_busy_time;\ +}% + + +0 > P. 1001:2001(1000) ack 1 + +.02 < . 1:1(0) ack 2001 win 2000 + +0 %{ assert 348000 <= tcpi_busy_time <= 360000, tcpi_busy_time }% diff --git a/tools/testing/selftests/net/packetdrill/tcp_tcp_info_tcp-info-sndbuf-limited.pkt b/tools/testing/selftests/net/packetdrill/tcp_tcp_info_tcp-info-sndbuf-limited.pkt new file mode 100644 index 000000000000..47f1ba68d141 --- /dev/null +++ b/tools/testing/selftests/net/packetdrill/tcp_tcp_info_tcp-info-sndbuf-limited.pkt @@ -0,0 +1,39 @@ +// SPDX-License-Identifier: GPL-2.0 +// Test send-buffer-limited time in tcp_info for client side. +`./defaults.sh` + +// Create a socket and set it to non-blocking. + 0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 + +0 fcntl(3, F_GETFL) = 0x2 (flags O_RDWR) + +0 fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0 + + +0 connect(3, ..., ...) = -1 EINPROGRESS (Operation now in progress) + +0 > S 0:0(0) + +.01 < S. 0:0(0) ack 1 win 10000 + +0 > . 1:1(0) ack 1 + +0 getsockopt(3, SOL_SOCKET, SO_ERROR, [0], [4]) = 0 + +0 fcntl(3, F_SETFL, O_RDWR) = 0 // set back to blocking + +0 setsockopt(3, SOL_SOCKET, SO_SNDBUF, [10000], 4) = 0 + +0 getsockopt(3, SOL_SOCKET, SO_SNDBUF, [20000], [4]) = 0 + + +.09...0.14 write(3, ..., 150000) = 150000 + + +.01 < . 1:1(0) ack 10001 win 10000 + + +.01 < . 1:1(0) ack 30001 win 10000 + +// cwnd goes from 40(60KB) to 80(120KB), and that we hit the tiny sndbuf limit 10KB + +.01 < . 1:1(0) ack 70001 win 10000 + + +.02 < . 1:1(0) ack 95001 win 10000 + +0 %{ assert 19000 <= tcpi_sndbuf_limited <= 21000, tcpi_sndbuf_limited; \ + assert 49000 <= tcpi_busy_time <= 52000, tcpi_busy_time; \ + assert 0 == tcpi_rwnd_limited, tcpi_rwnd_limited }% + +// This ack frees up enough buffer so we are no longer +// buffer limited (socket flag SOCK_NOSPACE is cleared) + +.02 < . 1:1(0) ack 150001 win 10000 + +0 %{ assert 19000 <= tcpi_sndbuf_limited <= 21000, tcpi_sndbuf_limited;\ + assert 69000 <= tcpi_busy_time <= 73000, tcpi_busy_time;\ + assert 0 == tcpi_rwnd_limited, tcpi_rwnd_limited }% +