1// SPDX-License-Identifier: GPL-2.0 2// Fastopen client zerocopy test: 3// 4// send data with MSG_FASTOPEN | MSG_ZEROCOPY and verify that the 5// kernel returns the notification ID. 6// 7// Fastopen requires a stored cookie. Create two sockets. The first 8// one will have no data in the initial send. On return 0 the 9// zerocopy notification counter is not incremented. Verify this too. 10 11--send_omit_free // do not reuse send buffers with zerocopy 12 13`./defaults.sh` 14 15// Send a FastOpen request, no cookie yet so no data in SYN 16 0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 17 +0 fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0 18 +0 setsockopt(3, SOL_SOCKET, SO_ZEROCOPY, [1], 4) = 0 19 +0 sendto(3, ..., 500, MSG_FASTOPEN|MSG_ZEROCOPY, ..., ...) = -1 EINPROGRESS (Operation now in progress) 20 +0 > S 0:0(0) <mss 1460,sackOK,TS val 1000 ecr 0,nop,wscale 8,FO,nop,nop> 21 +.01 < S. 123:123(0) ack 1 win 14600 <mss 940,TS val 2000 ecr 1000,sackOK,nop,wscale 6, FO abcd1234,nop,nop> 22 +0 > . 1:1(0) ack 1 <nop,nop,TS val 1001 ecr 2000> 23 24// Read from error queue: no zerocopy notification 25 +1 recvmsg(3, {msg_name(...)=..., 26 msg_iov(1)=[{...,0}], 27 msg_flags=MSG_ERRQUEUE, 28 msg_control=[]}, MSG_ERRQUEUE) = -1 EAGAIN (Resource temporarily unavailable) 29 30 +.01 close(3) = 0 31 +0 > F. 1:1(0) ack 1 <nop,nop,TS val 1002 ecr 2000> 32 +.01 < F. 1:1(0) ack 2 win 92 <nop,nop,TS val 2001 ecr 1002> 33 +0 > . 2:2(0) ack 2 <nop,nop,TS val 1003 ecr 2001> 34 35// Send another Fastopen request, now SYN will have data 36 +.07 `sysctl -q net.ipv4.tcp_timestamps=0` 37 +.1 socket(..., SOCK_STREAM, IPPROTO_TCP) = 5 38 +0 fcntl(5, F_SETFL, O_RDWR|O_NONBLOCK) = 0 39 +0 setsockopt(5, SOL_SOCKET, SO_ZEROCOPY, [1], 4) = 0 40 +0 sendto(5, ..., 500, MSG_FASTOPEN|MSG_ZEROCOPY, ..., ...) = 500 41 +0 > S 0:500(500) <mss 1460,nop,nop,sackOK,nop,wscale 8,FO abcd1234,nop,nop> 42 +.05 < S. 5678:5678(0) ack 501 win 14600 <mss 1460,nop,nop,sackOK,nop,wscale 6> 43 +0 > . 501:501(0) ack 1 44 45// Read from error queue: now has first zerocopy notification 46 +0.5 recvmsg(5, {msg_name(...)=..., 47 msg_iov(1)=[{...,0}], 48 msg_flags=MSG_ERRQUEUE, 49 msg_control=[ 50 {cmsg_level=CMSG_LEVEL_IP, 51 cmsg_type=CMSG_TYPE_RECVERR, 52 cmsg_data={ee_errno=0, 53 ee_origin=SO_EE_ORIGIN_ZEROCOPY, 54 ee_type=0, 55 ee_code=SO_EE_CODE_ZEROCOPY_COPIED, 56 ee_info=0, 57 ee_data=0}} 58 ]}, MSG_ERRQUEUE) = 0 59