1// SPDX-License-Identifier: GPL-2.0 2// basic zerocopy test: 3// 4// send a packet with MSG_ZEROCOPY and receive the notification ID 5// repeat and verify IDs are consecutive 6 7--send_omit_free // do not reuse send buffers with zerocopy 8 9`./defaults.sh` 10 11 0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 12 +0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 13 +0 setsockopt(3, SOL_SOCKET, SO_ZEROCOPY, [1], 4) = 0 14 +0 bind(3, ..., ...) = 0 15 +0 listen(3, 1) = 0 16 17 +0 < S 0:0(0) win 32792 <mss 1000,sackOK,nop,nop,nop,wscale 7> 18 +0 > S. 0:0(0) ack 1 <mss 1460,nop,nop,sackOK,nop,wscale 8> 19 +0 < . 1:1(0) ack 1 win 257 20 21 +0 accept(3, ..., ...) = 4 22 23 +0 send(4, ..., 4000, MSG_ZEROCOPY) = 4000 24 +0 > P. 1:4001(4000) ack 1 25 +0 < . 1:1(0) ack 4001 win 257 26 27 +0 recvmsg(4, {msg_name(...)=..., 28 msg_iov(1)=[{...,0}], 29 msg_flags=MSG_ERRQUEUE, 30 msg_control=[ 31 {cmsg_level=CMSG_LEVEL_IP, 32 cmsg_type=CMSG_TYPE_RECVERR, 33 cmsg_data={ee_errno=0, 34 ee_origin=SO_EE_ORIGIN_ZEROCOPY, 35 ee_type=0, 36 ee_code=SO_EE_CODE_ZEROCOPY_COPIED, 37 ee_info=0, 38 ee_data=0}} 39 ]}, MSG_ERRQUEUE) = 0 40 41 +0 send(4, ..., 4000, MSG_ZEROCOPY) = 4000 42 +0 > P. 4001:8001(4000) ack 1 43 +0 < . 1:1(0) ack 8001 win 257 44 45 +0 recvmsg(4, {msg_name(...)=..., 46 msg_iov(1)=[{...,0}], 47 msg_flags=MSG_ERRQUEUE, 48 msg_control=[ 49 {cmsg_level=CMSG_LEVEL_IP, 50 cmsg_type=CMSG_TYPE_RECVERR, 51 cmsg_data={ee_errno=0, 52 ee_origin=SO_EE_ORIGIN_ZEROCOPY, 53 ee_type=0, 54 ee_code=SO_EE_CODE_ZEROCOPY_COPIED, 55 ee_info=1, 56 ee_data=1}} 57 ]}, MSG_ERRQUEUE) = 0 58