| // 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 <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 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 <sack 2001:3001,nop,nop> |
| +.001 < . 1:1(0) ack 1 win 257 <sack 2001:3001 6001:7001,nop,nop> |
| +.001 < . 1:1(0) ack 1 win 257 <sack 2001:3001 6001:7001 8001:9001,nop,nop> |
| |
| // 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 <sack 2001:4001 6001:7001 8001:9001,nop,nop> |
| +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 <sack 2001:4001 6001:7001 8001:10001,nop,nop> |
| +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 <sack 2001:4001 6001:7001 8001:10001,nop,nop> |
| +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 <sack 6001:7001 8001:10001,nop,nop> |
| +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 <sack 8001:10001,nop,nop> |
| |
| // 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 |
| }% |
