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// SPDX-License-Identifier: GPL-2.0
// Test that tx timestamping sends timestamps only for
// the last byte of each sendmsg.
`./defaults.sh
`
// Create a socket and set it to non-blocking.
0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
+0 fcntl(3, F_GETFL) = 0x2 (flags O_RDWR)
+0 fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0
// Establish connection and verify that there was no error.
+0 connect(3, ..., ...) = -1 EINPROGRESS (Operation now in progress)
+0 > S 0:0(0) <mss 1460,sackOK,TS val 100 ecr 0,nop,wscale 8>
+.01 < S. 0:0(0) ack 1 win 20000 <mss 1000,nop,nop,sackOK>
+0 > . 1:1(0) ack 1
+0 getsockopt(3, SOL_SOCKET, SO_ERROR, [0], [4]) = 0
+0 fcntl(3, F_SETFL, O_RDWR) = 0 // set back to blocking
+0 setsockopt(3, SOL_SOCKET, SO_TIMESTAMPING,
[SOF_TIMESTAMPING_TX_SCHED | SOF_TIMESTAMPING_TX_SOFTWARE |
SOF_TIMESTAMPING_TX_ACK | SOF_TIMESTAMPING_SOFTWARE |
SOF_TIMESTAMPING_OPT_ID], 4) = 0
+0 write(3, ..., 11000) = 11000
+0 > P. 1:10001(10000) ack 1
+.01 < . 1:1(0) ack 10001 win 4000
+0 > P. 10001:11001(1000) ack 1
+.01 < . 1:1(0) ack 11001 win 4000
// Make sure that internal TCP timestamps are not overwritten and we have sane
// RTT measurement.
+0 %{
assert 5000 <= tcpi_rtt <= 20000, 'srtt=%d us' % tcpi_rtt
}%
// SCM_TSTAMP_SCHED for the last byte should be received almost immediately
// once 10001 is acked at t=20ms.
// setsockopt(..., [SOF_TIMESTAMPING_SOFTWARE | SOF_TIMESTAMPING_OPT_ID], ...)
// is called after when SYN is acked. So, we expect the last byte of the first
// chunk to have a timestamp key of 10999 (i.e., 11000 - 1).
+0 recvmsg(3, {msg_name(...)=...,
msg_iov(1)=[{...,0}],
msg_flags=MSG_ERRQUEUE|MSG_TRUNC,
msg_control=[
{cmsg_level=SOL_SOCKET,
cmsg_type=SCM_TIMESTAMPING,
cmsg_data={scm_sec=0,scm_nsec=20000000}},
{cmsg_level=CMSG_LEVEL_IP,
cmsg_type=CMSG_TYPE_RECVERR,
cmsg_data={ee_errno=ENOMSG,
ee_origin=SO_EE_ORIGIN_TIMESTAMPING,
ee_type=0,
ee_code=0,
ee_info=SCM_TSTAMP_SCHED,
ee_data=10999}}
]}, MSG_ERRQUEUE) = 0
// SCM_TSTAMP_SND for the last byte should be received almost immediately
// once 10001 is acked at t=20ms.
+0 recvmsg(3, {msg_name(...)=...,
msg_iov(1)=[{...,0}],
msg_flags=MSG_ERRQUEUE|MSG_TRUNC,
msg_control=[
{cmsg_level=SOL_SOCKET,
cmsg_type=SCM_TIMESTAMPING,
cmsg_data={scm_sec=0,scm_nsec=20000000}},
{cmsg_level=CMSG_LEVEL_IP,
cmsg_type=CMSG_TYPE_RECVERR,
cmsg_data={ee_errno=ENOMSG,
ee_origin=SO_EE_ORIGIN_TIMESTAMPING,
ee_type=0,
ee_code=0,
ee_info=SCM_TSTAMP_SND,
ee_data=10999}}
]}, MSG_ERRQUEUE) = 0
// SCM_TSTAMP_ACK for the last byte should be received at t=30ms.
+0 recvmsg(3, {msg_name(...)=...,
msg_iov(1)=[{...,0}],
msg_flags=MSG_ERRQUEUE|MSG_TRUNC,
msg_control=[
{cmsg_level=SOL_SOCKET,
cmsg_type=SCM_TIMESTAMPING,
cmsg_data={scm_sec=0,scm_nsec=30000000}},
{cmsg_level=CMSG_LEVEL_IP,
cmsg_type=CMSG_TYPE_RECVERR,
cmsg_data={ee_errno=ENOMSG,
ee_origin=SO_EE_ORIGIN_TIMESTAMPING,
ee_type=0,
ee_code=0,
ee_info=SCM_TSTAMP_ACK,
ee_data=10999}}
]}, MSG_ERRQUEUE) = 0
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