1// SPDX-License-Identifier: GPL-2.0 2// Fastopen server zerocopy test: 3// 4// send data with MSG_FASTOPEN | MSG_ZEROCOPY and verify that the 5// kernel returns the notification ID. 6 7--send_omit_free // do not reuse send buffers with zerocopy 8 9`./defaults.sh 10 ./set_sysctls.py /proc/sys/net/ipv4/tcp_fastopen=0x207` 11 12// Set up a TFO server listening socket. 13 0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 14 +.1 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 15 +0 bind(3, ..., ...) = 0 16 +0 listen(3, 1) = 0 17 +0 setsockopt(3, SOL_TCP, TCP_FASTOPEN, [2], 4) = 0 18 +0 setsockopt(3, SOL_SOCKET, SO_ZEROCOPY, [1], 4) = 0 19 20// Client sends a SYN with data. 21 +.1 < S 0:1000(1000) win 32792 <mss 1460,sackOK,nop,nop> 22 +0 > S. 0:0(0) ack 1001 <mss 1460,nop,nop,sackOK> 23 24// Server accepts and replies with data. 25+.005 accept(3, ..., ...) = 4 26 +0 read(4, ..., 1024) = 1000 27 +0 sendto(4, ..., 1000, MSG_ZEROCOPY, ..., ...) = 1000 28 +0 > P. 1:1001(1000) ack 1001 29 +.05 < . 1001:1001(0) ack 1001 win 32792 30 31// Read from error queue: now has first zerocopy notification 32 +0.1 recvmsg(4, {msg_name(...)=..., 33 msg_iov(1)=[{...,0}], 34 msg_flags=MSG_ERRQUEUE, 35 msg_control=[ 36 {cmsg_level=CMSG_LEVEL_IP, 37 cmsg_type=CMSG_TYPE_RECVERR, 38 cmsg_data={ee_errno=0, 39 ee_origin=SO_EE_ORIGIN_ZEROCOPY, 40 ee_type=0, 41 ee_code=SO_EE_CODE_ZEROCOPY_COPIED, 42 ee_info=0, 43 ee_data=0}} 44 ]}, MSG_ERRQUEUE) = 0 45 46`/tmp/sysctl_restore_${PPID}.sh` 47