1// SPDX-License-Identifier: GPL-2.0 2// Test send-buffer-limited time in tcp_info for client side. 3`./defaults.sh` 4 5// Create a socket and set it to non-blocking. 6 0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 7 +0 fcntl(3, F_GETFL) = 0x2 (flags O_RDWR) 8 +0 fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0 9 10 +0 connect(3, ..., ...) = -1 EINPROGRESS (Operation now in progress) 11 +0 > S 0:0(0) <mss 1460,sackOK,TS val 100 ecr 0,nop,wscale 8> 12 +.01 < S. 0:0(0) ack 1 win 10000 <mss 1000,sackOK,nop,nop,nop,wscale 8> 13 +0 > . 1:1(0) ack 1 14 +0 getsockopt(3, SOL_SOCKET, SO_ERROR, [0], [4]) = 0 15 +0 fcntl(3, F_SETFL, O_RDWR) = 0 // set back to blocking 16 +0 setsockopt(3, SOL_SOCKET, SO_SNDBUF, [10000], 4) = 0 17 +0 getsockopt(3, SOL_SOCKET, SO_SNDBUF, [20000], [4]) = 0 18 19 +.09...0.14 write(3, ..., 150000) = 150000 20 21 +.01 < . 1:1(0) ack 10001 win 10000 22 23 +.01 < . 1:1(0) ack 30001 win 10000 24 25// cwnd goes from 40(60KB) to 80(120KB), and that we hit the tiny sndbuf limit 10KB 26 +.01 < . 1:1(0) ack 70001 win 10000 27 28 +.02 < . 1:1(0) ack 95001 win 10000 29 +0 %{ assert 19000 <= tcpi_sndbuf_limited <= 21000, tcpi_sndbuf_limited; \ 30 assert 49000 <= tcpi_busy_time <= 52000, tcpi_busy_time; \ 31 assert 0 == tcpi_rwnd_limited, tcpi_rwnd_limited }% 32 33// This ack frees up enough buffer so we are no longer 34// buffer limited (socket flag SOCK_NOSPACE is cleared) 35 +.02 < . 1:1(0) ack 150001 win 10000 36 +0 %{ assert 19000 <= tcpi_sndbuf_limited <= 21000, tcpi_sndbuf_limited;\ 37 assert 69000 <= tcpi_busy_time <= 73000, tcpi_busy_time;\ 38 assert 0 == tcpi_rwnd_limited, tcpi_rwnd_limited }% 39