tjh.dev
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`./defaults.sh`
8
9 0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
10 +0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
11 +0 setsockopt(3, SOL_SOCKET, SO_ZEROCOPY, [1], 4) = 0
12 +0 bind(3, ..., ...) = 0
13 +0 listen(3, 1) = 0
14
15 +0 < S 0:0(0) win 32792 <mss 1000,sackOK,nop,nop,nop,wscale 7>
16 +0 > S. 0:0(0) ack 1 <mss 1460,nop,nop,sackOK,nop,wscale 8>
17 +0 < . 1:1(0) ack 1 win 257
18
19 +0 accept(3, ..., ...) = 4
20
21 +0 send(4, ..., 4000, MSG_ZEROCOPY) = 4000
22 +0 > P. 1:4001(4000) ack 1
23 +0 < . 1:1(0) ack 4001 win 257
24
25 +0 recvmsg(4, {msg_name(...)=...,
26 msg_iov(1)=[{...,0}],
27 msg_flags=MSG_ERRQUEUE,
28 msg_control=[
29 {cmsg_level=CMSG_LEVEL_IP,
30 cmsg_type=CMSG_TYPE_RECVERR,
31 cmsg_data={ee_errno=0,
32 ee_origin=SO_EE_ORIGIN_ZEROCOPY,
33 ee_type=0,
34 ee_code=SO_EE_CODE_ZEROCOPY_COPIED,
35 ee_info=0,
36 ee_data=0}}
37 ]}, MSG_ERRQUEUE) = 0
38
39 +0 send(4, ..., 4000, MSG_ZEROCOPY) = 4000
40 +0 > P. 4001:8001(4000) ack 1
41 +0 < . 1:1(0) ack 8001 win 257
42
43 +0 recvmsg(4, {msg_name(...)=...,
44 msg_iov(1)=[{...,0}],
45 msg_flags=MSG_ERRQUEUE,
46 msg_control=[
47 {cmsg_level=CMSG_LEVEL_IP,
48 cmsg_type=CMSG_TYPE_RECVERR,
49 cmsg_data={ee_errno=0,
50 ee_origin=SO_EE_ORIGIN_ZEROCOPY,
51 ee_type=0,
52 ee_code=SO_EE_CODE_ZEROCOPY_COPIED,
53 ee_info=1,
54 ee_data=1}}
55 ]}, MSG_ERRQUEUE) = 0