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1// SPDX-License-Identifier: GPL-2.02// Fastopen client zerocopy test:3//4// send data with MSG_FASTOPEN | MSG_ZEROCOPY and verify that the5// kernel returns the notification ID.6//7// Fastopen requires a stored cookie. Create two sockets. The first8// one will have no data in the initial send. On return 0 the9// zerocopy notification counter is not incremented. Verify this too.10 11`./defaults.sh`12 13// Send a FastOpen request, no cookie yet so no data in SYN14 0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 315 +0 fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 016 +0 setsockopt(3, SOL_SOCKET, SO_ZEROCOPY, [1], 4) = 017 +0 sendto(3, ..., 500, MSG_FASTOPEN|MSG_ZEROCOPY, ..., ...) = -1 EINPROGRESS (Operation now in progress)18 +0 > S 0:0(0) <mss 1460,sackOK,TS val 1000 ecr 0,nop,wscale 8,FO,nop,nop>19 +.01 < S. 123:123(0) ack 1 win 14600 <mss 940,TS val 2000 ecr 1000,sackOK,nop,wscale 6, FO abcd1234,nop,nop>20 +0 > . 1:1(0) ack 1 <nop,nop,TS val 1001 ecr 2000>21 22// Read from error queue: no zerocopy notification23 +1 recvmsg(3, {msg_name(...)=...,24 msg_iov(1)=[{...,0}],25 msg_flags=MSG_ERRQUEUE,26 msg_control=[]}, MSG_ERRQUEUE) = -1 EAGAIN (Resource temporarily unavailable)27 28 +.01 close(3) = 029 +0 > F. 1:1(0) ack 1 <nop,nop,TS val 1002 ecr 2000>30 +.01 < F. 1:1(0) ack 2 win 92 <nop,nop,TS val 2001 ecr 1002>31 +0 > . 2:2(0) ack 2 <nop,nop,TS val 1003 ecr 2001>32 33// Send another Fastopen request, now SYN will have data34 +.07 `sysctl -q net.ipv4.tcp_timestamps=0`35 +.1 socket(..., SOCK_STREAM, IPPROTO_TCP) = 536 +0 fcntl(5, F_SETFL, O_RDWR|O_NONBLOCK) = 037 +0 setsockopt(5, SOL_SOCKET, SO_ZEROCOPY, [1], 4) = 038 +0 sendto(5, ..., 500, MSG_FASTOPEN|MSG_ZEROCOPY, ..., ...) = 50039 +0 > S 0:500(500) <mss 1460,nop,nop,sackOK,nop,wscale 8,FO abcd1234,nop,nop>40 +.05 < S. 5678:5678(0) ack 501 win 14600 <mss 1460,nop,nop,sackOK,nop,wscale 6>41 +0 > . 501:501(0) ack 142 43// Read from error queue: now has first zerocopy notification44 +0.5 recvmsg(5, {msg_name(...)=...,45 msg_iov(1)=[{...,0}],46 msg_flags=MSG_ERRQUEUE,47 msg_control=[48 {cmsg_level=CMSG_LEVEL_IP,49 cmsg_type=CMSG_TYPE_RECVERR,50 cmsg_data={ee_errno=0,51 ee_origin=SO_EE_ORIGIN_ZEROCOPY,52 ee_type=0,53 ee_code=SO_EE_CODE_ZEROCOPY_COPIED,54 ee_info=0,55 ee_data=0}}56 ]}, MSG_ERRQUEUE) = 057