xref: /linux/tools/testing/selftests/net/packetdrill/tcp_timestamping_client-only-last-byte.pkt (revision 0ad9617c78acbc71373fb341a6f75d4012b01d69)

// 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