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// 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