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1// SPDX-License-Identifier: GPL-2.02// Fastopen server zerocopy test:3//4// send data with MSG_FASTOPEN | MSG_ZEROCOPY and verify that the5// kernel returns the notification ID.6 7`./defaults.sh8 ./set_sysctls.py /proc/sys/net/ipv4/tcp_fastopen=0x207`9 10// Set up a TFO server listening socket.11 0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 312 +.1 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 013 +0 bind(3, ..., ...) = 014 +0 listen(3, 1) = 015 +0 setsockopt(3, SOL_TCP, TCP_FASTOPEN, [2], 4) = 016 +0 setsockopt(3, SOL_SOCKET, SO_ZEROCOPY, [1], 4) = 017 18// Client sends a SYN with data.19 +.1 < S 0:1000(1000) win 32792 <mss 1460,sackOK,nop,nop>20 +0 > S. 0:0(0) ack 1001 <mss 1460,nop,nop,sackOK>21 22// Server accepts and replies with data.23+.005 accept(3, ..., ...) = 424 +0 read(4, ..., 1024) = 100025 +0 sendto(4, ..., 1000, MSG_ZEROCOPY, ..., ...) = 100026 +0 > P. 1:1001(1000) ack 100127 +.05 < . 1001:1001(0) ack 1001 win 3279228 29// Read from error queue: now has first zerocopy notification30 +0.1 recvmsg(4, {msg_name(...)=...,31 msg_iov(1)=[{...,0}],32 msg_flags=MSG_ERRQUEUE,33 msg_control=[34 {cmsg_level=CMSG_LEVEL_IP,35 cmsg_type=CMSG_TYPE_RECVERR,36 cmsg_data={ee_errno=0,37 ee_origin=SO_EE_ORIGIN_ZEROCOPY,38 ee_type=0,39 ee_code=SO_EE_CODE_ZEROCOPY_COPIED,40 ee_info=0,41 ee_data=0}}42 ]}, MSG_ERRQUEUE) = 043 44`/tmp/sysctl_restore_${PPID}.sh`45