1*88395c07SSoham Chakradeo// SPDX-License-Identifier: GPL-2.0 2*88395c07SSoham Chakradeo// Test send-buffer-limited time in tcp_info for client side. 3*88395c07SSoham Chakradeo`./defaults.sh` 4*88395c07SSoham Chakradeo 5*88395c07SSoham Chakradeo// Create a socket and set it to non-blocking. 6*88395c07SSoham Chakradeo 0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 7*88395c07SSoham Chakradeo +0 fcntl(3, F_GETFL) = 0x2 (flags O_RDWR) 8*88395c07SSoham Chakradeo +0 fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0 9*88395c07SSoham Chakradeo 10*88395c07SSoham Chakradeo +0 connect(3, ..., ...) = -1 EINPROGRESS (Operation now in progress) 11*88395c07SSoham Chakradeo +0 > S 0:0(0) <mss 1460,sackOK,TS val 100 ecr 0,nop,wscale 8> 12*88395c07SSoham Chakradeo +.01 < S. 0:0(0) ack 1 win 10000 <mss 1000,sackOK,nop,nop,nop,wscale 8> 13*88395c07SSoham Chakradeo +0 > . 1:1(0) ack 1 14*88395c07SSoham Chakradeo +0 getsockopt(3, SOL_SOCKET, SO_ERROR, [0], [4]) = 0 15*88395c07SSoham Chakradeo +0 fcntl(3, F_SETFL, O_RDWR) = 0 // set back to blocking 16*88395c07SSoham Chakradeo +0 setsockopt(3, SOL_SOCKET, SO_SNDBUF, [10000], 4) = 0 17*88395c07SSoham Chakradeo +0 getsockopt(3, SOL_SOCKET, SO_SNDBUF, [20000], [4]) = 0 18*88395c07SSoham Chakradeo 19*88395c07SSoham Chakradeo +.09...0.14 write(3, ..., 150000) = 150000 20*88395c07SSoham Chakradeo 21*88395c07SSoham Chakradeo +.01 < . 1:1(0) ack 10001 win 10000 22*88395c07SSoham Chakradeo 23*88395c07SSoham Chakradeo +.01 < . 1:1(0) ack 30001 win 10000 24*88395c07SSoham Chakradeo 25*88395c07SSoham Chakradeo// cwnd goes from 40(60KB) to 80(120KB), and that we hit the tiny sndbuf limit 10KB 26*88395c07SSoham Chakradeo +.01 < . 1:1(0) ack 70001 win 10000 27*88395c07SSoham Chakradeo 28*88395c07SSoham Chakradeo +.02 < . 1:1(0) ack 95001 win 10000 29*88395c07SSoham Chakradeo +0 %{ assert 19000 <= tcpi_sndbuf_limited <= 21000, tcpi_sndbuf_limited; \ 30*88395c07SSoham Chakradeo assert 49000 <= tcpi_busy_time <= 52000, tcpi_busy_time; \ 31*88395c07SSoham Chakradeo assert 0 == tcpi_rwnd_limited, tcpi_rwnd_limited }% 32*88395c07SSoham Chakradeo 33*88395c07SSoham Chakradeo// This ack frees up enough buffer so we are no longer 34*88395c07SSoham Chakradeo// buffer limited (socket flag SOCK_NOSPACE is cleared) 35*88395c07SSoham Chakradeo +.02 < . 1:1(0) ack 150001 win 10000 36*88395c07SSoham Chakradeo +0 %{ assert 19000 <= tcpi_sndbuf_limited <= 21000, tcpi_sndbuf_limited;\ 37*88395c07SSoham Chakradeo assert 69000 <= tcpi_busy_time <= 73000, tcpi_busy_time;\ 38*88395c07SSoham Chakradeo assert 0 == tcpi_rwnd_limited, tcpi_rwnd_limited }% 39