1// SPDX-License-Identifier: GPL-2.0 2// Minimal client-side zerocopy test 3 4`./defaults.sh` 5 6 0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 4 7 +0 setsockopt(4, SOL_SOCKET, SO_ZEROCOPY, [1], 4) = 0 8 +0...0 connect(4, ..., ...) = 0 9 10 +0 > S 0:0(0) <mss 1460,sackOK,TS val 0 ecr 0,nop,wscale 8> 11 +0 < S. 0:0(0) ack 1 win 32792 <mss 1000,sackOK,nop,nop,nop,wscale 7> 12 +0 > . 1:1(0) ack 1 13 14 +0 send(4, ..., 4000, MSG_ZEROCOPY) = 4000 15 +0 > P. 1:4001(4000) ack 1 16 +0 < . 1:1(0) ack 4001 win 257 17 18 +0 recvmsg(4, {msg_name(...)=..., 19 msg_iov(1)=[{...,0}], 20 msg_flags=MSG_ERRQUEUE, 21 msg_control=[ 22 {cmsg_level=CMSG_LEVEL_IP, 23 cmsg_type=CMSG_TYPE_RECVERR, 24 cmsg_data={ee_errno=0, 25 ee_origin=SO_EE_ORIGIN_ZEROCOPY, 26 ee_type=0, 27 ee_code=SO_EE_CODE_ZEROCOPY_COPIED, 28 ee_info=0, 29 ee_data=0}} 30 ]}, MSG_ERRQUEUE) = 0 31