[PATCH AUTOSEL 5.11 029/104] selftests/powerpc: Fix L1D flushing tests for Power10

[PATCH AUTOSEL 5.11 029/104] selftests/powerpc: Fix L1D flushing tests for Power10

[Sasha Levin]

From: Russell Currey <ruscur@russell.cc>

[ Upstream commit 3a72c94ebfb1f171eba0715998010678a09ec796 ]

The rfi_flush and entry_flush selftests work by using the PM_LD_MISS_L1
perf event to count L1D misses.  The value of this event has changed
over time:

- Power7 uses 0x400f0
- Power8 and Power9 use both 0x400f0 and 0x3e054
- Power10 uses only 0x3e054

Rather than relying on raw values, configure perf to count L1D read
misses in the most explicit way available.

This fixes the selftests to work on systems without 0x400f0 as
PM_LD_MISS_L1, and should change no behaviour for systems that the tests
already worked on.

The only potential downside is that referring to a specific perf event
requires PMU support implemented in the kernel for that platform.

Signed-off-by: Russell Currey <ruscur@russell.cc>
Acked-by: Daniel Axtens <dja@axtens.net>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210223070227.2916871-1-ruscur@russell.cc
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 tools/testing/selftests/powerpc/security/entry_flush.c | 2 +-
 tools/testing/selftests/powerpc/security/flush_utils.h | 4 ++++
 tools/testing/selftests/powerpc/security/rfi_flush.c   | 2 +-
 3 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/powerpc/security/entry_flush.c b/tools/testing/selftests/powerpc/security/entry_flush.c
index 78cf914fa321..68ce377b205e 100644
--- a/tools/testing/selftests/powerpc/security/entry_flush.c
+++ b/tools/testing/selftests/powerpc/security/entry_flush.c
@@ -53,7 +53,7 @@ int entry_flush_test(void)
 
 	entry_flush = entry_flush_orig;
 
-	fd = perf_event_open_counter(PERF_TYPE_RAW, /* L1d miss */ 0x400f0, -1);
+	fd = perf_event_open_counter(PERF_TYPE_HW_CACHE, PERF_L1D_READ_MISS_CONFIG, -1);
 	FAIL_IF(fd < 0);
 
 	p = (char *)memalign(zero_size, CACHELINE_SIZE);
diff --git a/tools/testing/selftests/powerpc/security/flush_utils.h b/tools/testing/selftests/powerpc/security/flush_utils.h
index 07a5eb301466..7a3d60292916 100644
--- a/tools/testing/selftests/powerpc/security/flush_utils.h
+++ b/tools/testing/selftests/powerpc/security/flush_utils.h
@@ -9,6 +9,10 @@
 
 #define CACHELINE_SIZE 128
 
+#define PERF_L1D_READ_MISS_CONFIG	((PERF_COUNT_HW_CACHE_L1D) | 		\
+					(PERF_COUNT_HW_CACHE_OP_READ << 8) |	\
+					(PERF_COUNT_HW_CACHE_RESULT_MISS << 16))
+
 void syscall_loop(char *p, unsigned long iterations,
 		  unsigned long zero_size);
 
diff --git a/tools/testing/selftests/powerpc/security/rfi_flush.c b/tools/testing/selftests/powerpc/security/rfi_flush.c
index 7565fd786640..f73484a6470f 100644
--- a/tools/testing/selftests/powerpc/security/rfi_flush.c
+++ b/tools/testing/selftests/powerpc/security/rfi_flush.c
@@ -54,7 +54,7 @@ int rfi_flush_test(void)
 
 	rfi_flush = rfi_flush_orig;
 
-	fd = perf_event_open_counter(PERF_TYPE_RAW, /* L1d miss */ 0x400f0, -1);
+	fd = perf_event_open_counter(PERF_TYPE_HW_CACHE, PERF_L1D_READ_MISS_CONFIG, -1);
 	FAIL_IF(fd < 0);
 
 	p = (char *)memalign(zero_size, CACHELINE_SIZE);
-- 
2.30.2

[PATCH AUTOSEL 5.11 040/104] selftests: mptcp: launch mptcp_connect with timeout

[Sasha Levin]

From: Matthieu Baerts <matthieu.baerts@tessares.net>

[ Upstream commit 5888a61cb4e00695075bbacfd86f3fa73af00413 ]

'mptcp_connect' already has a timeout for poll() but in some cases, it
is not enough.

With "timeout" tool, we will force the command to fail if it doesn't
finish on time. Thanks to that, the script will continue and display
details about the current state before marking the test as failed.
Displaying this state is very important to be able to understand the
issue. Best to have our CI reporting the issue than just "the test
hanged".

Note that in mptcp_connect.sh, we were using a long timeout to validate
the fact we cannot create a socket if a sysctl is set. We don't need
this timeout.

In diag.sh, we want to send signals to mptcp_connect instances that have
been started in the netns. But we cannot send this signal to 'timeout'
otherwise that will stop the timeout and messages telling us SIGUSR1 has
been received will be printed. Instead of trying to find the right PID
and storing them in an array, we can simply use the output of
'ip netns pids' which is all the PIDs we want to send signal to.

Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/160
Signed-off-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 tools/testing/selftests/net/mptcp/diag.sh     | 55 ++++++++++++-------
 .../selftests/net/mptcp/mptcp_connect.sh      | 15 +++--
 .../testing/selftests/net/mptcp/mptcp_join.sh | 22 ++++++--
 .../selftests/net/mptcp/simult_flows.sh       | 13 ++++-
 4 files changed, 72 insertions(+), 33 deletions(-)

diff --git a/tools/testing/selftests/net/mptcp/diag.sh b/tools/testing/selftests/net/mptcp/diag.sh
index 39edce4f541c..2674ba20d524 100755
--- a/tools/testing/selftests/net/mptcp/diag.sh
+++ b/tools/testing/selftests/net/mptcp/diag.sh
@@ -5,8 +5,9 @@ rndh=$(printf %x $sec)-$(mktemp -u XXXXXX)
 ns="ns1-$rndh"
 ksft_skip=4
 test_cnt=1
+timeout_poll=100
+timeout_test=$((timeout_poll * 2 + 1))
 ret=0
-pids=()
 
 flush_pids()
 {
@@ -14,18 +15,14 @@ flush_pids()
 	# give it some time
 	sleep 1.1
 
-	for pid in ${pids[@]}; do
-		[ -d /proc/$pid ] && kill -SIGUSR1 $pid >/dev/null 2>&1
-	done
-	pids=()
+	ip netns pids "${ns}" | xargs --no-run-if-empty kill -SIGUSR1 &>/dev/null
 }
 
 cleanup()
 {
+	ip netns pids "${ns}" | xargs --no-run-if-empty kill -SIGKILL &>/dev/null
+
 	ip netns del $ns
-	for pid in ${pids[@]}; do
-		[ -d /proc/$pid ] && kill -9 $pid >/dev/null 2>&1
-	done
 }
 
 ip -Version > /dev/null 2>&1
@@ -79,39 +76,57 @@ trap cleanup EXIT
 ip netns add $ns
 ip -n $ns link set dev lo up
 
-echo "a" | ip netns exec $ns ./mptcp_connect -p 10000 -l 0.0.0.0 -t 100 >/dev/null &
+echo "a" | \
+	timeout ${timeout_test} \
+		ip netns exec $ns \
+			./mptcp_connect -p 10000 -l -t ${timeout_poll} \
+				0.0.0.0 >/dev/null &
 sleep 0.1
-pids[0]=$!
 chk_msk_nr 0 "no msk on netns creation"
 
-echo "b" | ip netns exec $ns ./mptcp_connect -p 10000 127.0.0.1 -j -t 100 >/dev/null &
+echo "b" | \
+	timeout ${timeout_test} \
+		ip netns exec $ns \
+			./mptcp_connect -p 10000 -j -t ${timeout_poll} \
+				127.0.0.1 >/dev/null &
 sleep 0.1
-pids[1]=$!
 chk_msk_nr 2 "after MPC handshake "
 chk_msk_remote_key_nr 2 "....chk remote_key"
 chk_msk_fallback_nr 0 "....chk no fallback"
 flush_pids
 
 
-echo "a" | ip netns exec $ns ./mptcp_connect -p 10001 -s TCP -l 0.0.0.0 -t 100 >/dev/null &
-pids[0]=$!
+echo "a" | \
+	timeout ${timeout_test} \
+		ip netns exec $ns \
+			./mptcp_connect -p 10001 -l -s TCP -t ${timeout_poll} \
+				0.0.0.0 >/dev/null &
 sleep 0.1
-echo "b" | ip netns exec $ns ./mptcp_connect -p 10001 127.0.0.1 -j -t 100 >/dev/null &
-pids[1]=$!
+echo "b" | \
+	timeout ${timeout_test} \
+		ip netns exec $ns \
+			./mptcp_connect -p 10001 -j -t ${timeout_poll} \
+				127.0.0.1 >/dev/null &
 sleep 0.1
 chk_msk_fallback_nr 1 "check fallback"
 flush_pids
 
 NR_CLIENTS=100
 for I in `seq 1 $NR_CLIENTS`; do
-	echo "a" | ip netns exec $ns ./mptcp_connect -p $((I+10001)) -l 0.0.0.0 -t 100 -w 10 >/dev/null  &
-	pids[$((I*2))]=$!
+	echo "a" | \
+		timeout ${timeout_test} \
+			ip netns exec $ns \
+				./mptcp_connect -p $((I+10001)) -l -w 10 \
+					-t ${timeout_poll} 0.0.0.0 >/dev/null &
 done
 sleep 0.1
 
 for I in `seq 1 $NR_CLIENTS`; do
-	echo "b" | ip netns exec $ns ./mptcp_connect -p $((I+10001)) 127.0.0.1 -t 100 -w 10 >/dev/null &
-	pids[$((I*2 + 1))]=$!
+	echo "b" | \
+		timeout ${timeout_test} \
+			ip netns exec $ns \
+				./mptcp_connect -p $((I+10001)) -w 10 \
+					-t ${timeout_poll} 127.0.0.1 >/dev/null &
 done
 sleep 1.5
 
diff --git a/tools/testing/selftests/net/mptcp/mptcp_connect.sh b/tools/testing/selftests/net/mptcp/mptcp_connect.sh
index e927df83efb9..c37acb790bd6 100755
--- a/tools/testing/selftests/net/mptcp/mptcp_connect.sh
+++ b/tools/testing/selftests/net/mptcp/mptcp_connect.sh
@@ -11,7 +11,8 @@ cin=""
 cout=""
 ksft_skip=4
 capture=false
-timeout=30
+timeout_poll=30
+timeout_test=$((timeout_poll * 2 + 1))
 ipv6=true
 ethtool_random_on=true
 tc_delay="$((RANDOM%50))"
@@ -272,7 +273,7 @@ check_mptcp_disabled()
 	ip netns exec ${disabled_ns} sysctl -q net.mptcp.enabled=0
 
 	local err=0
-	LANG=C ip netns exec ${disabled_ns} ./mptcp_connect -t $timeout -p 10000 -s MPTCP 127.0.0.1 < "$cin" 2>&1 | \
+	LANG=C ip netns exec ${disabled_ns} ./mptcp_connect -p 10000 -s MPTCP 127.0.0.1 < "$cin" 2>&1 | \
 		grep -q "^socket: Protocol not available$" && err=1
 	ip netns delete ${disabled_ns}
 
@@ -414,14 +415,20 @@ do_transfer()
 	local stat_cookietx_last=$(ip netns exec ${listener_ns} nstat -z -a TcpExtSyncookiesSent | while read a count c rest ;do  echo $count;done)
 	local stat_cookierx_last=$(ip netns exec ${listener_ns} nstat -z -a TcpExtSyncookiesRecv | while read a count c rest ;do  echo $count;done)
 
-	ip netns exec ${listener_ns} ./mptcp_connect -t $timeout -l -p $port -s ${srv_proto} $extra_args $local_addr < "$sin" > "$sout" &
+	timeout ${timeout_test} \
+		ip netns exec ${listener_ns} \
+			./mptcp_connect -t ${timeout_poll} -l -p $port -s ${srv_proto} \
+				$extra_args $local_addr < "$sin" > "$sout" &
 	local spid=$!
 
 	wait_local_port_listen "${listener_ns}" "${port}"
 
 	local start
 	start=$(date +%s%3N)
-	ip netns exec ${connector_ns} ./mptcp_connect -t $timeout -p $port -s ${cl_proto} $extra_args $connect_addr < "$cin" > "$cout" &
+	timeout ${timeout_test} \
+		ip netns exec ${connector_ns} \
+			./mptcp_connect -t ${timeout_poll} -p $port -s ${cl_proto} \
+				$extra_args $connect_addr < "$cin" > "$cout" &
 	local cpid=$!
 
 	wait $cpid
diff --git a/tools/testing/selftests/net/mptcp/mptcp_join.sh b/tools/testing/selftests/net/mptcp/mptcp_join.sh
index 9aa9624cff97..99c5dc0eeb26 100755
--- a/tools/testing/selftests/net/mptcp/mptcp_join.sh
+++ b/tools/testing/selftests/net/mptcp/mptcp_join.sh
@@ -8,7 +8,8 @@ cin=""
 cinsent=""
 cout=""
 ksft_skip=4
-timeout=30
+timeout_poll=30
+timeout_test=$((timeout_poll * 2 + 1))
 mptcp_connect=""
 capture=0
 
@@ -249,17 +250,26 @@ do_transfer()
 		local_addr="0.0.0.0"
 	fi
 
-	ip netns exec ${listener_ns} $mptcp_connect -t $timeout -l -p $port \
-		-s ${srv_proto} ${local_addr} < "$sin" > "$sout" &
+	timeout ${timeout_test} \
+		ip netns exec ${listener_ns} \
+			$mptcp_connect -t ${timeout_poll} -l -p $port -s ${srv_proto} \
+				${local_addr} < "$sin" > "$sout" &
 	spid=$!
 
 	sleep 1
 
 	if [ "$test_link_fail" -eq 0 ];then
-		ip netns exec ${connector_ns} $mptcp_connect -t $timeout -p $port -s ${cl_proto} $connect_addr < "$cin" > "$cout" &
+		timeout ${timeout_test} \
+			ip netns exec ${connector_ns} \
+				$mptcp_connect -t ${timeout_poll} -p $port -s ${cl_proto} \
+					$connect_addr < "$cin" > "$cout" &
 	else
-		( cat "$cin" ; sleep 2; link_failure $listener_ns ; cat "$cin" ) | tee "$cinsent" | \
-		ip netns exec ${connector_ns} $mptcp_connect -t $timeout -p $port -s ${cl_proto} $connect_addr > "$cout" &
+		( cat "$cin" ; sleep 2; link_failure $listener_ns ; cat "$cin" ) | \
+			tee "$cinsent" | \
+			timeout ${timeout_test} \
+				ip netns exec ${connector_ns} \
+					$mptcp_connect -t ${timeout_poll} -p $port -s ${cl_proto} \
+						$connect_addr > "$cout" &
 	fi
 	cpid=$!
 
diff --git a/tools/testing/selftests/net/mptcp/simult_flows.sh b/tools/testing/selftests/net/mptcp/simult_flows.sh
index f039ee57eb3c..3aeef3bcb101 100755
--- a/tools/testing/selftests/net/mptcp/simult_flows.sh
+++ b/tools/testing/selftests/net/mptcp/simult_flows.sh
@@ -7,7 +7,8 @@ ns2="ns2-$rndh"
 ns3="ns3-$rndh"
 capture=false
 ksft_skip=4
-timeout=30
+timeout_poll=30
+timeout_test=$((timeout_poll * 2 + 1))
 test_cnt=1
 ret=0
 bail=0
@@ -157,14 +158,20 @@ do_transfer()
 		sleep 1
 	fi
 
-	ip netns exec ${ns3} ./mptcp_connect -jt $timeout -l -p $port 0.0.0.0 < "$sin" > "$sout" &
+	timeout ${timeout_test} \
+		ip netns exec ${ns3} \
+			./mptcp_connect -jt ${timeout_poll} -l -p $port \
+				0.0.0.0 < "$sin" > "$sout" &
 	local spid=$!
 
 	wait_local_port_listen "${ns3}" "${port}"
 
 	local start
 	start=$(date +%s%3N)
-	ip netns exec ${ns1} ./mptcp_connect -jt $timeout -p $port 10.0.3.3 < "$cin" > "$cout" &
+	timeout ${timeout_test} \
+		ip netns exec ${ns1} \
+			./mptcp_connect -jt ${timeout_poll} -p $port \
+				10.0.3.3 < "$cin" > "$cout" &
 	local cpid=$!
 
 	wait $cpid
-- 
2.30.2

[PATCH AUTOSEL 5.11 069/104] selftests: Set CC to clang in lib.mk if LLVM is set

[Sasha Levin]

From: Yonghong Song <yhs@fb.com>

[ Upstream commit 26e6dd1072763cd5696b75994c03982dde952ad9 ]

selftests/bpf/Makefile includes lib.mk. With the following command
  make -j60 LLVM=1 LLVM_IAS=1  <=== compile kernel
  make -j60 -C tools/testing/selftests/bpf LLVM=1 LLVM_IAS=1 V=1
some files are still compiled with gcc. This patch
fixed lib.mk issue which sets CC to gcc in all cases.

Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20210413153413.3027426-1-yhs@fb.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 tools/testing/selftests/lib.mk | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/testing/selftests/lib.mk b/tools/testing/selftests/lib.mk
index a5ce26d548e4..9a41d8bb9ff1 100644
--- a/tools/testing/selftests/lib.mk
+++ b/tools/testing/selftests/lib.mk
@@ -1,6 +1,10 @@
 # This mimics the top-level Makefile. We do it explicitly here so that this
 # Makefile can operate with or without the kbuild infrastructure.
+ifneq ($(LLVM),)
+CC := clang
+else
 CC := $(CROSS_COMPILE)gcc
+endif
 
 ifeq (0,$(MAKELEVEL))
     ifeq ($(OUTPUT),)
-- 
2.30.2

[PATCH AUTOSEL 5.11 096/104] selftests: mlxsw: Increase the tolerance of backlog buildup

[Sasha Levin]

From: Petr Machata <petrm@nvidia.com>

[ Upstream commit dda7f4fa55839baeb72ae040aeaf9ccf89d3e416 ]

The intention behind this test is to make sure that qdisc limit is
correctly projected to the HW. However, first, due to rounding in the
qdisc, and then in the driver, the number cannot actually be accurate. And
second, the approach to testing this is to oversubscribe the port with
traffic generated on the same switch. The actual backlog size therefore
fluctuates.

In practice, this test proved to be noisier than the rest, and spuriously
fails every now and then. Increase the tolerance to 10 % to avoid these
issues.

Signed-off-by: Petr Machata <petrm@nvidia.com>
Acked-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 tools/testing/selftests/drivers/net/mlxsw/sch_red_core.sh | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/drivers/net/mlxsw/sch_red_core.sh b/tools/testing/selftests/drivers/net/mlxsw/sch_red_core.sh
index b0cb1aaffdda..33ddd01689be 100644
--- a/tools/testing/selftests/drivers/net/mlxsw/sch_red_core.sh
+++ b/tools/testing/selftests/drivers/net/mlxsw/sch_red_core.sh
@@ -507,8 +507,8 @@ do_red_test()
 	check_err $? "backlog $backlog / $limit Got $pct% marked packets, expected == 0."
 	local diff=$((limit - backlog))
 	pct=$((100 * diff / limit))
-	((0 <= pct && pct <= 5))
-	check_err $? "backlog $backlog / $limit expected <= 5% distance"
+	((0 <= pct && pct <= 10))
+	check_err $? "backlog $backlog / $limit expected <= 10% distance"
 	log_test "TC $((vlan - 10)): RED backlog > limit"
 
 	stop_traffic
-- 
2.30.2

[PATCH AUTOSEL 5.11 097/104] selftests: mlxsw: Fix mausezahn invocation in ERSPAN scale test

[Sasha Levin]

From: Petr Machata <petrm@nvidia.com>

[ Upstream commit 1233898ab758cbcf5f6fea10b8dd16a0b2c24fab ]

The mirror_gre_scale test creates as many ERSPAN sessions as the underlying
chip supports, and tests that they all work. In order to determine that it
issues a stream of ICMP packets and checks if they are mirrored as
expected.

However, the mausezahn invocation missed the -6 flag to identify the use of
IPv6 protocol, and was sending ICMP messages over IPv6, as opposed to
ICMP6. It also didn't pass an explicit source IP address, which apparently
worked at some point in the past, but does not anymore.

To fix these issues, extend the function mirror_test() in mirror_lib by
detecting the IPv6 protocol addresses, and using a different ICMP scheme.
Fix __mirror_gre_test() in the selftest itself to pass a source IP address.

Signed-off-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 .../drivers/net/mlxsw/mirror_gre_scale.sh     |  3 ++-
 .../selftests/net/forwarding/mirror_lib.sh    | 19 +++++++++++++++++--
 2 files changed, 19 insertions(+), 3 deletions(-)

diff --git a/tools/testing/selftests/drivers/net/mlxsw/mirror_gre_scale.sh b/tools/testing/selftests/drivers/net/mlxsw/mirror_gre_scale.sh
index 6f3a70df63bc..e00435753008 100644
--- a/tools/testing/selftests/drivers/net/mlxsw/mirror_gre_scale.sh
+++ b/tools/testing/selftests/drivers/net/mlxsw/mirror_gre_scale.sh
@@ -120,12 +120,13 @@ __mirror_gre_test()
 	sleep 5
 
 	for ((i = 0; i < count; ++i)); do
+		local sip=$(mirror_gre_ipv6_addr 1 $i)::1
 		local dip=$(mirror_gre_ipv6_addr 1 $i)::2
 		local htun=h3-gt6-$i
 		local message
 
 		icmp6_capture_install $htun
-		mirror_test v$h1 "" $dip $htun 100 10
+		mirror_test v$h1 $sip $dip $htun 100 10
 		icmp6_capture_uninstall $htun
 	done
 }
diff --git a/tools/testing/selftests/net/forwarding/mirror_lib.sh b/tools/testing/selftests/net/forwarding/mirror_lib.sh
index 13db1cb50e57..6406cd76a19d 100644
--- a/tools/testing/selftests/net/forwarding/mirror_lib.sh
+++ b/tools/testing/selftests/net/forwarding/mirror_lib.sh
@@ -20,6 +20,13 @@ mirror_uninstall()
 	tc filter del dev $swp1 $direction pref 1000
 }
 
+is_ipv6()
+{
+	local addr=$1; shift
+
+	[[ -z ${addr//[0-9a-fA-F:]/} ]]
+}
+
 mirror_test()
 {
 	local vrf_name=$1; shift
@@ -29,9 +36,17 @@ mirror_test()
 	local pref=$1; shift
 	local expect=$1; shift
 
+	if is_ipv6 $dip; then
+		local proto=-6
+		local type="icmp6 type=128" # Echo request.
+	else
+		local proto=
+		local type="icmp echoreq"
+	fi
+
 	local t0=$(tc_rule_stats_get $dev $pref)
-	$MZ $vrf_name ${sip:+-A $sip} -B $dip -a own -b bc -q \
-	    -c 10 -d 100msec -t icmp type=8
+	$MZ $proto $vrf_name ${sip:+-A $sip} -B $dip -a own -b bc -q \
+	    -c 10 -d 100msec -t $type
 	sleep 0.5
 	local t1=$(tc_rule_stats_get $dev $pref)
 	local delta=$((t1 - t0))
-- 
2.30.2