Merge branch 'mptcp-selftests'

Mat Martineau says:

====================
mptcp: Some selftest improvements

Here are a couple of selftest changes for MPTCP.

Patch 1 fixes a mistake where the wrong protocol (TCP vs MPTCP) could be
requested on the listening socket in some link failure tests.

Patch 2 refactors the simulataneous flow tests to improve timing
accuracy and give more consistent results.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

tools/testing/selftests/net/mptcp/mptcp_connect.c

@@ -14,6 +14,7 @@
 #include <strings.h>
 #include <signal.h>
 #include <unistd.h>
+#include <time.h>
 
 #include <sys/poll.h>
 #include <sys/sendfile.h>
@@ -64,6 +65,7 @@ static int cfg_sndbuf;
 static int cfg_rcvbuf;
 static bool cfg_join;
 static bool cfg_remove;
+static unsigned int cfg_time;
 static unsigned int cfg_do_w;
 static int cfg_wait;
 static uint32_t cfg_mark;
@@ -78,9 +80,10 @@ static struct cfg_cmsg_types cfg_cmsg_types;
 static void die_usage(void)
 {
 	fprintf(stderr, "Usage: mptcp_connect [-6] [-u] [-s MPTCP|TCP] [-p port] [-m mode]"
-		"[-l] [-w sec] connect_address\n");
+		"[-l] [-w sec] [-t num] [-T num] connect_address\n");
 	fprintf(stderr, "\t-6 use ipv6\n");
 	fprintf(stderr, "\t-t num -- set poll timeout to num\n");
+	fprintf(stderr, "\t-T num -- set expected runtime to num ms\n");
 	fprintf(stderr, "\t-S num -- set SO_SNDBUF to num\n");
 	fprintf(stderr, "\t-R num -- set SO_RCVBUF to num\n");
 	fprintf(stderr, "\t-p num -- use port num\n");
@@ -448,7 +451,7 @@ static void set_nonblock(int fd)
 	fcntl(fd, F_SETFL, flags | O_NONBLOCK);
 }
 
-static int copyfd_io_poll(int infd, int peerfd, int outfd)
+static int copyfd_io_poll(int infd, int peerfd, int outfd, bool *in_closed_after_out)
 {
 	struct pollfd fds = {
 		.fd = peerfd,
@@ -487,9 +490,11 @@ static int copyfd_io_poll(int infd, int peerfd, int outfd)
 				 */
 				fds.events &= ~POLLIN;
 
-				if ((fds.events & POLLOUT) == 0)
+				if ((fds.events & POLLOUT) == 0) {
+					*in_closed_after_out = true;
 					/* and nothing more to send */
 					break;
+				}
 
 			/* Else, still have data to transmit */
 			} else if (len < 0) {
@@ -547,7 +552,7 @@ static int copyfd_io_poll(int infd, int peerfd, int outfd)
 	}
 
 	/* leave some time for late join/announce */
-	if (cfg_join || cfg_remove)
+	if (cfg_remove)
 		usleep(cfg_wait);
 
 	close(peerfd);
@@ -646,7 +651,7 @@ static int do_sendfile(int infd, int outfd, unsigned int count)
 }
 
 static int copyfd_io_mmap(int infd, int peerfd, int outfd,
-			  unsigned int size)
+			  unsigned int size, bool *in_closed_after_out)
 {
 	int err;
 
@@ -664,13 +669,14 @@ static int copyfd_io_mmap(int infd, int peerfd, int outfd,
 		shutdown(peerfd, SHUT_WR);
 
 		err = do_recvfile(peerfd, outfd);
+		*in_closed_after_out = true;
 	}
 
 	return err;
 }
 
 static int copyfd_io_sendfile(int infd, int peerfd, int outfd,
-			      unsigned int size)
+			      unsigned int size, bool *in_closed_after_out)
 {
 	int err;
 
@@ -685,6 +691,7 @@ static int copyfd_io_sendfile(int infd, int peerfd, int outfd,
 		if (err)
 			return err;
 		err = do_recvfile(peerfd, outfd);
+		*in_closed_after_out = true;
 	}
 
 	return err;
@@ -692,27 +699,62 @@ static int copyfd_io_sendfile(int infd, int peerfd, int outfd,
 
 static int copyfd_io(int infd, int peerfd, int outfd)
 {
+	bool in_closed_after_out = false;
+	struct timespec start, end;
 	int file_size;
+	int ret;
+
+	if (cfg_time && (clock_gettime(CLOCK_MONOTONIC, &start) < 0))
+		xerror("can not fetch start time %d", errno);
 
 	switch (cfg_mode) {
 	case CFG_MODE_POLL:
-		return copyfd_io_poll(infd, peerfd, outfd);
+		ret = copyfd_io_poll(infd, peerfd, outfd, &in_closed_after_out);
+		break;
+
 	case CFG_MODE_MMAP:
 		file_size = get_infd_size(infd);
 		if (file_size < 0)
 			return file_size;
-		return copyfd_io_mmap(infd, peerfd, outfd, file_size);
+		ret = copyfd_io_mmap(infd, peerfd, outfd, file_size, &in_closed_after_out);
+		break;
+
 	case CFG_MODE_SENDFILE:
 		file_size = get_infd_size(infd);
 		if (file_size < 0)
 			return file_size;
-		return copyfd_io_sendfile(infd, peerfd, outfd, file_size);
-	}
+		ret = copyfd_io_sendfile(infd, peerfd, outfd, file_size, &in_closed_after_out);
+		break;
 
+	default:
 		fprintf(stderr, "Invalid mode %d\n", cfg_mode);
 
 		die_usage();
 		return 1;
+	}
+
+	if (ret)
+		return ret;
+
+	if (cfg_time) {
+		unsigned int delta_ms;
+
+		if (clock_gettime(CLOCK_MONOTONIC, &end) < 0)
+			xerror("can not fetch end time %d", errno);
+		delta_ms = (end.tv_sec - start.tv_sec) * 1000 + (end.tv_nsec - start.tv_nsec) / 1000000;
+		if (delta_ms > cfg_time) {
+			xerror("transfer slower than expected! runtime %d ms, expected %d ms",
+			       delta_ms, cfg_time);
+		}
+
+		/* show the runtime only if this end shutdown(wr) before receiving the EOF,
+		 * (that is, if this end got the longer runtime)
+		 */
+		if (in_closed_after_out)
+			fprintf(stderr, "%d", delta_ms);
+	}
+
+	return 0;
 }
 
 static void check_sockaddr(int pf, struct sockaddr_storage *ss,
@@ -1005,12 +1047,11 @@ static void parse_opts(int argc, char **argv)
 {
 	int c;
 
-	while ((c = getopt(argc, argv, "6jr:lp:s:hut:m:S:R:w:M:P:c:")) != -1) {
+	while ((c = getopt(argc, argv, "6jr:lp:s:hut:T:m:S:R:w:M:P:c:")) != -1) {
 		switch (c) {
 		case 'j':
 			cfg_join = true;
 			cfg_mode = CFG_MODE_POLL;
-			cfg_wait = 400000;
 			break;
 		case 'r':
 			cfg_remove = true;
@@ -1043,6 +1084,9 @@ static void parse_opts(int argc, char **argv)
 			if (poll_timeout <= 0)
 				poll_timeout = -1;
 			break;
+		case 'T':
+			cfg_time = atoi(optarg);
+			break;
 		case 'm':
 			cfg_mode = parse_mode(optarg);
 			break;

tools/testing/selftests/net/mptcp/mptcp_join.sh

@@ -297,7 +297,7 @@ do_transfer()
 	if [ "$test_link_fail" -eq 2 ];then
 		timeout ${timeout_test} \
 			ip netns exec ${listener_ns} \
-				$mptcp_connect -t ${timeout_poll} -l -p $port -s ${cl_proto} \
+				$mptcp_connect -t ${timeout_poll} -l -p $port -s ${srv_proto} \
 					${local_addr} < "$sinfail" > "$sout" &
 	else
 		timeout ${timeout_test} \

tools/testing/selftests/net/mptcp/simult_flows.sh

@@ -51,7 +51,7 @@ setup()
 	sout=$(mktemp)
 	cout=$(mktemp)
 	capout=$(mktemp)
-	size=$((2048 * 4096))
+	size=$((2 * 2048 * 4096))
 	dd if=/dev/zero of=$small bs=4096 count=20 >/dev/null 2>&1
 	dd if=/dev/zero of=$large bs=4096 count=$((size / 4096)) >/dev/null 2>&1
 
@@ -161,17 +161,15 @@ do_transfer()
 
 	timeout ${timeout_test} \
 		ip netns exec ${ns3} \
-			./mptcp_connect -jt ${timeout_poll} -l -p $port \
+			./mptcp_connect -jt ${timeout_poll} -l -p $port -T $time \
 				0.0.0.0 < "$sin" > "$sout" &
 	local spid=$!
 
 	wait_local_port_listen "${ns3}" "${port}"
 
-	local start
-	start=$(date +%s%3N)
 	timeout ${timeout_test} \
 		ip netns exec ${ns1} \
-			./mptcp_connect -jt ${timeout_poll} -p $port \
+			./mptcp_connect -jt ${timeout_poll} -p $port -T $time \
 				10.0.3.3 < "$cin" > "$cout" &
 	local cpid=$!
 
@@ -180,27 +178,20 @@ do_transfer()
 	wait $spid
 	local rets=$?
 
-	local stop
-	stop=$(date +%s%3N)
-
 	if $capture; then
 		sleep 1
 		kill ${cappid_listener}
 		kill ${cappid_connector}
 	fi
 
-	local duration
-	duration=$((stop-start))
-
 	cmp $sin $cout > /dev/null 2>&1
 	local cmps=$?
 	cmp $cin $sout > /dev/null 2>&1
 	local cmpc=$?
 
-	printf "%16s" "$duration max $max_time "
+	printf "%-16s" " max $max_time "
 	if [ $retc -eq 0 ] && [ $rets -eq 0 ] && \
-	   [ $cmpc -eq 0 ] && [ $cmps -eq 0 ] && \
-	   [ $duration -lt $max_time ]; then
+	   [ $cmpc -eq 0 ] && [ $cmps -eq 0 ]; then
 		echo "[ OK ]"
 		cat "$capout"
 		return 0
@@ -244,23 +235,24 @@ run_test()
 	tc -n $ns2 qdisc add dev ns2eth1 root netem rate ${rate1}mbit $delay1
 	tc -n $ns2 qdisc add dev ns2eth2 root netem rate ${rate2}mbit $delay2
 
-	# time is measure in ms
-	local time=$((size * 8 * 1000 / (( $rate1 + $rate2) * 1024 *1024) ))
+	# time is measured in ms, account for transfer size, affegated link speed
+	# and header overhead (10%)
+	local time=$((size * 8 * 1000 * 10 / (( $rate1 + $rate2) * 1024 *1024 * 9) ))
 
 	# mptcp_connect will do some sleeps to allow the mp_join handshake
-	# completion
-	time=$((time + 1350))
+	# completion (see mptcp_connect): 200ms on each side, add some slack
+	time=$((time + 450))
 
-	printf "%-50s" "$msg"
-	do_transfer $small $large $((time * 11 / 10))
+	printf "%-60s" "$msg"
+	do_transfer $small $large $time
 	lret=$?
 	if [ $lret -ne 0 ]; then
 		ret=$lret
 		[ $bail -eq 0 ] || exit $ret
 	fi
 
-	printf "%-50s" "$msg - reverse direction"
-	do_transfer $large $small $((time * 11 / 10))
+	printf "%-60s" "$msg - reverse direction"
+	do_transfer $large $small $time
 	lret=$?
 	if [ $lret -ne 0 ]; then
 		ret=$lret