Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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