tcp_zerocopy_epoll_exclusive.pkt

 1// SPDX-License-Identifier: GPL-2.0
 2// epoll zerocopy test:
 3//
 4// EPOLLERR is known to be not edge-triggered unlike EPOLLIN and EPOLLOUT but
 5// it is not level-triggered either. this tests verify that the same behavior is
 6// maintained when we have EPOLLEXCLUSIVE.
 7//
 8// fire two sends with MSG_ZEROCOPY and receive the acks. confirm that EPOLLERR
 9// is correctly fired only once, when EPOLLET is set. send another packet with
10// MSG_ZEROCOPY. confirm that EPOLLERR is correctly fired again only once.
11
12--send_omit_free	// do not reuse send buffers with zerocopy
13
14`./defaults.sh`
15
16    0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
17   +0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
18   +0 setsockopt(3, SOL_SOCKET, SO_ZEROCOPY, [1], 4) = 0
19   +0 bind(3, ..., ...) = 0
20   +0 listen(3, 1) = 0
21
22   +0 < S 0:0(0) win 32792 <mss 1000,sackOK,nop,nop,nop,wscale 7>
23   +0 > S. 0:0(0) ack 1 <mss 1460,nop,nop,sackOK,nop,wscale 8>
24   +0 < . 1:1(0) ack 1 win 257
25
26   +0 accept(3, ..., ...) = 4
27
28   +0 fcntl(4, F_SETFL, O_RDWR|O_NONBLOCK) = 0
29   +0 epoll_create(1) = 5
30   +0 epoll_ctl(5, EPOLL_CTL_ADD, 4,
31		{events=EPOLLOUT|EPOLLET|EPOLLEXCLUSIVE, fd=4}) = 0
32   +0 epoll_wait(5, {events=EPOLLOUT, fd=4}, 1, 0) = 1
33
34   +0 send(4, ..., 4000, MSG_ZEROCOPY) = 4000
35   +0 > P. 1:4001(4000) ack 1
36   +0 < . 1:1(0) ack 4001 win 257
37
38   +0 send(4, ..., 4000, MSG_ZEROCOPY) = 4000
39   +0 > P. 4001:8001(4000) ack 1
40   +0 < . 1:1(0) ack 8001 win 257
41
42// receive only one EPOLLERR for the two sends above.
43   +0 epoll_wait(5, {events=EPOLLERR|EPOLLOUT, fd=4}, 1, 0) = 1
44   +0 epoll_wait(5, {events=0, ptr=0}, 1, 0) = 0
45
46   +0 send(4, ..., 4000, MSG_ZEROCOPY) = 4000
47   +0 > P. 8001:12001(4000) ack 1
48   +0 < . 1:1(0) ack 12001 win 257
49
50// receive only one EPOLLERR for the third send above.
51   +0 epoll_wait(5, {events=EPOLLERR|EPOLLOUT, fd=4}, 1, 0) = 1
52   +0 epoll_wait(5, {events=0, ptr=0}, 1, 0) = 0
53
54   +0 recvmsg(4, {msg_name(...)=...,
55                  msg_iov(1)=[{...,0}],
56                  msg_flags=MSG_ERRQUEUE,
57                  msg_control=[
58                        {cmsg_level=CMSG_LEVEL_IP,
59                         cmsg_type=CMSG_TYPE_RECVERR,
60                         cmsg_data={ee_errno=0,
61                                    ee_origin=SO_EE_ORIGIN_ZEROCOPY,
62                                    ee_type=0,
63                                    ee_code=SO_EE_CODE_ZEROCOPY_COPIED,
64                                    ee_info=0,
65                                    ee_data=2}}
66                   ]}, MSG_ERRQUEUE) = 0