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// SPDX-License-Identifier: GPL-2.0
// basic zerocopy test:
//
// send a packet with MSG_ZEROCOPY and receive the notification ID
// repeat and verify IDs are consecutive
--send_omit_free // do not reuse send buffers with zerocopy
`./defaults.sh`
0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
+0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
+0 setsockopt(3, SOL_SOCKET, SO_ZEROCOPY, [1], 4) = 0
+0 bind(3, ..., ...) = 0
+0 listen(3, 1) = 0
+0 < S 0:0(0) win 32792 <mss 1000,sackOK,nop,nop,nop,wscale 7>
+0 > S. 0:0(0) ack 1 <mss 1460,nop,nop,sackOK,nop,wscale 8>
+0 < . 1:1(0) ack 1 win 257
+0 accept(3, ..., ...) = 4
+0 send(4, ..., 4000, MSG_ZEROCOPY) = 4000
+0 > P. 1:4001(4000) ack 1
+0 < . 1:1(0) ack 4001 win 257
+0 recvmsg(4, {msg_name(...)=...,
msg_iov(1)=[{...,0}],
msg_flags=MSG_ERRQUEUE,
msg_control=[
{cmsg_level=CMSG_LEVEL_IP,
cmsg_type=CMSG_TYPE_RECVERR,
cmsg_data={ee_errno=0,
ee_origin=SO_EE_ORIGIN_ZEROCOPY,
ee_type=0,
ee_code=SO_EE_CODE_ZEROCOPY_COPIED,
ee_info=0,
ee_data=0}}
]}, MSG_ERRQUEUE) = 0
+0 send(4, ..., 4000, MSG_ZEROCOPY) = 4000
+0 > P. 4001:8001(4000) ack 1
+0 < . 1:1(0) ack 8001 win 257
+0 recvmsg(4, {msg_name(...)=...,
msg_iov(1)=[{...,0}],
msg_flags=MSG_ERRQUEUE,
msg_control=[
{cmsg_level=CMSG_LEVEL_IP,
cmsg_type=CMSG_TYPE_RECVERR,
cmsg_data={ee_errno=0,
ee_origin=SO_EE_ORIGIN_ZEROCOPY,
ee_type=0,
ee_code=SO_EE_CODE_ZEROCOPY_COPIED,
ee_info=1,
ee_data=1}}
]}, MSG_ERRQUEUE) = 0
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