| // 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) <mss 1460,sackOK,TS val 100 ecr 0,nop,wscale 8> |
| |
| // Server advertises 0 receive window. |
| +.01 < S. 0:0(0) ack 1 win 0 <mss 1000,nop,nop,sackOK> |
| |
| +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 }% |
