Commit 56490b62 authored by David Ahern's avatar David Ahern Committed by David S. Miller
Browse files

selftests: Add debugging options to pmtu.sh 



pmtu.sh script runs a number of tests and dumps a summary of pass/fail.
If a test fails, it is near impossible to debug why. For example:

    TEST: ipv6: PMTU exceptions                       [FAIL]

There are a lot of commands run behind the scenes for this test. Which
one is failing?

Add a VERBOSE option to show commands that are run and any output from
those commands. Add a PAUSE_ON_FAIL option to halt the script if a test
fails allowing users to poke around with the setup in the failed state.

In the process, rename tracing to TRACING and move declaration to top
with the new variables.

Signed-off-by: default avatarDavid Ahern <dsahern@gmail.com>
Reviewed-by: default avatarStefano Brivio <sbrivio@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent bb23581b

tools/testing/selftests/net/pmtu.sh

+124 −89
Original line number Diff line number Diff line
@@ -116,6 +116,10 @@ 
# Kselftest framework requirement - SKIP code is 4.

ksft_skip=4



PAUSE_ON_FAIL=no

VERBOSE=0

TRACING=0



# Some systems don't have a ping6 binary anymore

which ping6 > /dev/null 2>&1 && ping6=$(which ping6) || ping6=$(which ping)
@@ -222,6 +226,23 @@ err_flush() { 
	err_buf=

}



run_cmd() {

	cmd="$*"



	if [ "$VERBOSE" = "1" ]; then

		printf "    COMMAND: $cmd\n"

	fi



	out="$($cmd 2>&1)"

	rc=$?

	if [ "$VERBOSE" = "1" -a -n "$out" ]; then

		echo "    $out"

		echo

	fi



	return $rc

}



# Find the auto-generated name for this namespace

nsname() {

	eval echo \$NS_$1
@@ -258,22 +279,22 @@ setup_fou_or_gue() { 
		fi

	fi



	${ns_a} ip fou add port 5555 ipproto ${ipproto} || return 2

	${ns_a} ip link add ${encap}_a type ${type} ${mode} local ${a_addr} remote ${b_addr} encap ${encap} encap-sport auto encap-dport 5556 || return 2

	run_cmd ${ns_a} ip fou add port 5555 ipproto ${ipproto} || return 2

	run_cmd ${ns_a} ip link add ${encap}_a type ${type} ${mode} local ${a_addr} remote ${b_addr} encap ${encap} encap-sport auto encap-dport 5556 || return 2



	${ns_b} ip fou add port 5556 ipproto ${ipproto}

	${ns_b} ip link add ${encap}_b type ${type} ${mode} local ${b_addr} remote ${a_addr} encap ${encap} encap-sport auto encap-dport 5555

	run_cmd ${ns_b} ip fou add port 5556 ipproto ${ipproto}

	run_cmd ${ns_b} ip link add ${encap}_b type ${type} ${mode} local ${b_addr} remote ${a_addr} encap ${encap} encap-sport auto encap-dport 5555



	if [ "${inner}" = "4" ]; then

		${ns_a} ip addr add ${tunnel4_a_addr}/${tunnel4_mask} dev ${encap}_a

		${ns_b} ip addr add ${tunnel4_b_addr}/${tunnel4_mask} dev ${encap}_b

		run_cmd ${ns_a} ip addr add ${tunnel4_a_addr}/${tunnel4_mask} dev ${encap}_a

		run_cmd ${ns_b} ip addr add ${tunnel4_b_addr}/${tunnel4_mask} dev ${encap}_b

	else

		${ns_a} ip addr add ${tunnel6_a_addr}/${tunnel6_mask} dev ${encap}_a

		${ns_b} ip addr add ${tunnel6_b_addr}/${tunnel6_mask} dev ${encap}_b

		run_cmd ${ns_a} ip addr add ${tunnel6_a_addr}/${tunnel6_mask} dev ${encap}_a

		run_cmd ${ns_b} ip addr add ${tunnel6_b_addr}/${tunnel6_mask} dev ${encap}_b

	fi



	${ns_a} ip link set ${encap}_a up

	${ns_b} ip link set ${encap}_b up

	run_cmd ${ns_a} ip link set ${encap}_a up

	run_cmd ${ns_b} ip link set ${encap}_b up

}



setup_fou44() {
@@ -319,17 +340,17 @@ setup_namespaces() { 
}



setup_veth() {

	${ns_a} ip link add veth_a type veth peer name veth_b || return 1

	${ns_a} ip link set veth_b netns ${NS_B}

	run_cmd ${ns_a} ip link add veth_a type veth peer name veth_b || return 1

	run_cmd ${ns_a} ip link set veth_b netns ${NS_B}



	${ns_a} ip addr add ${veth4_a_addr}/${veth4_mask} dev veth_a

	${ns_b} ip addr add ${veth4_b_addr}/${veth4_mask} dev veth_b

	run_cmd ${ns_a} ip addr add ${veth4_a_addr}/${veth4_mask} dev veth_a

	run_cmd ${ns_b} ip addr add ${veth4_b_addr}/${veth4_mask} dev veth_b



	${ns_a} ip addr add ${veth6_a_addr}/${veth6_mask} dev veth_a

	${ns_b} ip addr add ${veth6_b_addr}/${veth6_mask} dev veth_b

	run_cmd ${ns_a} ip addr add ${veth6_a_addr}/${veth6_mask} dev veth_a

	run_cmd ${ns_b} ip addr add ${veth6_b_addr}/${veth6_mask} dev veth_b



	${ns_a} ip link set veth_a up

	${ns_b} ip link set veth_b up

	run_cmd ${ns_a} ip link set veth_a up

	run_cmd ${ns_b} ip link set veth_b up

}



setup_vti() {
@@ -342,14 +363,14 @@ setup_vti() { 


	[ ${proto} -eq 6 ] && vti_type="vti6" || vti_type="vti"



	${ns_a} ip link add vti${proto}_a type ${vti_type} local ${veth_a_addr} remote ${veth_b_addr} key 10 || return 1

	${ns_b} ip link add vti${proto}_b type ${vti_type} local ${veth_b_addr} remote ${veth_a_addr} key 10

	run_cmd ${ns_a} ip link add vti${proto}_a type ${vti_type} local ${veth_a_addr} remote ${veth_b_addr} key 10 || return 1

	run_cmd ${ns_b} ip link add vti${proto}_b type ${vti_type} local ${veth_b_addr} remote ${veth_a_addr} key 10



	${ns_a} ip addr add ${vti_a_addr}/${vti_mask} dev vti${proto}_a

	${ns_b} ip addr add ${vti_b_addr}/${vti_mask} dev vti${proto}_b

	run_cmd ${ns_a} ip addr add ${vti_a_addr}/${vti_mask} dev vti${proto}_a

	run_cmd ${ns_b} ip addr add ${vti_b_addr}/${vti_mask} dev vti${proto}_b



	${ns_a} ip link set vti${proto}_a up

	${ns_b} ip link set vti${proto}_b up

	run_cmd ${ns_a} ip link set vti${proto}_a up

	run_cmd ${ns_b} ip link set vti${proto}_b up

}



setup_vti4() {
@@ -375,17 +396,17 @@ setup_vxlan_or_geneve() { 
		opts_b=""

	fi



	${ns_a} ip link add ${type}_a type ${type} id 1 ${opts_a} remote ${b_addr} ${opts} || return 1

	${ns_b} ip link add ${type}_b type ${type} id 1 ${opts_b} remote ${a_addr} ${opts}

	run_cmd ${ns_a} ip link add ${type}_a type ${type} id 1 ${opts_a} remote ${b_addr} ${opts} || return 1

	run_cmd ${ns_b} ip link add ${type}_b type ${type} id 1 ${opts_b} remote ${a_addr} ${opts}



	${ns_a} ip addr add ${tunnel4_a_addr}/${tunnel4_mask} dev ${type}_a

	${ns_b} ip addr add ${tunnel4_b_addr}/${tunnel4_mask} dev ${type}_b

	run_cmd ${ns_a} ip addr add ${tunnel4_a_addr}/${tunnel4_mask} dev ${type}_a

	run_cmd ${ns_b} ip addr add ${tunnel4_b_addr}/${tunnel4_mask} dev ${type}_b



	${ns_a} ip addr add ${tunnel6_a_addr}/${tunnel6_mask} dev ${type}_a

	${ns_b} ip addr add ${tunnel6_b_addr}/${tunnel6_mask} dev ${type}_b

	run_cmd ${ns_a} ip addr add ${tunnel6_a_addr}/${tunnel6_mask} dev ${type}_a

	run_cmd ${ns_b} ip addr add ${tunnel6_b_addr}/${tunnel6_mask} dev ${type}_b



	${ns_a} ip link set ${type}_a up

	${ns_b} ip link set ${type}_b up

	run_cmd ${ns_a} ip link set ${type}_a up

	run_cmd ${ns_b} ip link set ${type}_b up

}



setup_geneve4() {
@@ -409,15 +430,15 @@ setup_xfrm() { 
	veth_a_addr="${2}"

	veth_b_addr="${3}"



	${ns_a} ip -${proto} xfrm state add src ${veth_a_addr} dst ${veth_b_addr} spi 0x1000 proto esp aead "rfc4106(gcm(aes))" 0x0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f 128 mode tunnel || return 1

	${ns_a} ip -${proto} xfrm state add src ${veth_b_addr} dst ${veth_a_addr} spi 0x1001 proto esp aead "rfc4106(gcm(aes))" 0x0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f 128 mode tunnel

	${ns_a} ip -${proto} xfrm policy add dir out mark 10 tmpl src ${veth_a_addr} dst ${veth_b_addr} proto esp mode tunnel

	${ns_a} ip -${proto} xfrm policy add dir in mark 10 tmpl src ${veth_b_addr} dst ${veth_a_addr} proto esp mode tunnel

	run_cmd "${ns_a} ip -${proto} xfrm state add src ${veth_a_addr} dst ${veth_b_addr} spi 0x1000 proto esp aead 'rfc4106(gcm(aes))' 0x0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f 128 mode tunnel" || return 1

	run_cmd "${ns_a} ip -${proto} xfrm state add src ${veth_b_addr} dst ${veth_a_addr} spi 0x1001 proto esp aead 'rfc4106(gcm(aes))' 0x0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f 128 mode tunnel"

	run_cmd "${ns_a} ip -${proto} xfrm policy add dir out mark 10 tmpl src ${veth_a_addr} dst ${veth_b_addr} proto esp mode tunnel"

	run_cmd "${ns_a} ip -${proto} xfrm policy add dir in mark 10 tmpl src ${veth_b_addr} dst ${veth_a_addr} proto esp mode tunnel"



	${ns_b} ip -${proto} xfrm state add src ${veth_a_addr} dst ${veth_b_addr} spi 0x1000 proto esp aead "rfc4106(gcm(aes))" 0x0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f 128 mode tunnel

	${ns_b} ip -${proto} xfrm state add src ${veth_b_addr} dst ${veth_a_addr} spi 0x1001 proto esp aead "rfc4106(gcm(aes))" 0x0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f 128 mode tunnel

	${ns_b} ip -${proto} xfrm policy add dir out mark 10 tmpl src ${veth_b_addr} dst ${veth_a_addr} proto esp mode tunnel

	${ns_b} ip -${proto} xfrm policy add dir in mark 10 tmpl src ${veth_a_addr} dst ${veth_b_addr} proto esp mode tunnel

	run_cmd "${ns_b} ip -${proto} xfrm state add src ${veth_a_addr} dst ${veth_b_addr} spi 0x1000 proto esp aead 'rfc4106(gcm(aes))' 0x0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f 128 mode tunnel"

	run_cmd "${ns_b} ip -${proto} xfrm state add src ${veth_b_addr} dst ${veth_a_addr} spi 0x1001 proto esp aead 'rfc4106(gcm(aes))' 0x0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f 128 mode tunnel"

	run_cmd "${ns_b} ip -${proto} xfrm policy add dir out mark 10 tmpl src ${veth_b_addr} dst ${veth_a_addr} proto esp mode tunnel"

	run_cmd "${ns_b} ip -${proto} xfrm policy add dir in mark 10 tmpl src ${veth_a_addr} dst ${veth_b_addr} proto esp mode tunnel"

}



setup_xfrm4() {
@@ -481,7 +502,7 @@ setup() { 
}



trace() {

	[ $tracing -eq 0 ] && return

	[ $TRACING -eq 0 ] && return



	for arg do

		[ "${ns_cmd}" = "" ] && ns_cmd="${arg}" && continue
@@ -597,8 +618,8 @@ test_pmtu_ipvX() { 
	mtu "${ns_b}"  veth_B-R2 1500



	# Create route exceptions

	${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1800 ${dst1} > /dev/null

	${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1800 ${dst2} > /dev/null

	run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1800 ${dst1}

	run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1800 ${dst2}



	# Check that exceptions have been created with the correct PMTU

	pmtu_1="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst1})"
@@ -630,7 +651,7 @@ test_pmtu_ipvX() { 
	# Decrease remote MTU on path via R2, get new exception

	mtu "${ns_r2}" veth_R2-B 400

	mtu "${ns_b}"  veth_B-R2 400

	${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1400 ${dst2} > /dev/null

	run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1400 ${dst2}

	pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})"

	check_pmtu_value "lock 552" "${pmtu_2}" "exceeding MTU, with MTU < min_pmtu" || return 1
@@ -647,7 +668,7 @@ test_pmtu_ipvX() { 
	check_pmtu_value "1500" "${pmtu_2}" "increasing local MTU" || return 1



	# Get new exception

	${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1400 ${dst2} > /dev/null

	run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1400 ${dst2}

	pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})"

	check_pmtu_value "lock 552" "${pmtu_2}" "exceeding MTU, with MTU < min_pmtu" || return 1

}
@@ -696,7 +717,7 @@ test_pmtu_ipvX_over_vxlanY_or_geneveY_exception() { 


	mtu "${ns_a}" ${type}_a $((${ll_mtu} + 1000))

	mtu "${ns_b}" ${type}_b $((${ll_mtu} + 1000))

	${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s $((${ll_mtu} + 500)) ${dst} > /dev/null

	run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s $((${ll_mtu} + 500)) ${dst}



	# Check that exception was created

	pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst})"
@@ -776,7 +797,7 @@ test_pmtu_ipvX_over_fouY_or_gueY() { 


	mtu "${ns_a}" ${encap}_a $((${ll_mtu} + 1000))

	mtu "${ns_b}" ${encap}_b $((${ll_mtu} + 1000))

	${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s $((${ll_mtu} + 500)) ${dst} > /dev/null

	run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s $((${ll_mtu} + 500)) ${dst}



	# Check that exception was created

	pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst})"
@@ -834,13 +855,13 @@ test_pmtu_vti4_exception() { 


	# Send DF packet without exceeding link layer MTU, check that no

	# exception is created

	${ns_a} ping -q -M want -i 0.1 -w 1 -s ${ping_payload} ${tunnel4_b_addr} > /dev/null

	run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s ${ping_payload} ${tunnel4_b_addr}

	pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel4_b_addr})"

	check_pmtu_value "" "${pmtu}" "sending packet smaller than PMTU (IP payload length ${esp_payload_rfc4106})" || return 1



	# Now exceed link layer MTU by one byte, check that exception is created

	# with the right PMTU value

	${ns_a} ping -q -M want -i 0.1 -w 1 -s $((ping_payload + 1)) ${tunnel4_b_addr} > /dev/null

	run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s $((ping_payload + 1)) ${tunnel4_b_addr}

	pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel4_b_addr})"

	check_pmtu_value "${esp_payload_rfc4106}" "${pmtu}" "exceeding PMTU (IP payload length $((esp_payload_rfc4106 + 1)))"

}
@@ -856,7 +877,7 @@ test_pmtu_vti6_exception() { 
	mtu "${ns_b}" veth_b 4000

	mtu "${ns_a}" vti6_a 5000

	mtu "${ns_b}" vti6_b 5000

	${ns_a} ${ping6} -q -i 0.1 -w 1 -s 60000 ${tunnel6_b_addr} > /dev/null

	run_cmd ${ns_a} ${ping6} -q -i 0.1 -w 1 -s 60000 ${tunnel6_b_addr}



	# Check that exception was created

	pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})"
@@ -902,9 +923,9 @@ test_pmtu_vti6_default_mtu() { 
test_pmtu_vti4_link_add_mtu() {

	setup namespaces || return 2



	${ns_a} ip link add vti4_a type vti local ${veth4_a_addr} remote ${veth4_b_addr} key 10

	run_cmd ${ns_a} ip link add vti4_a type vti local ${veth4_a_addr} remote ${veth4_b_addr} key 10

	[ $? -ne 0 ] && err "  vti not supported" && return 2

	${ns_a} ip link del vti4_a

	run_cmd ${ns_a} ip link del vti4_a



	fail=0
@@ -912,7 +933,7 @@ test_pmtu_vti4_link_add_mtu() { 
	max=$((65535 - 20))

	# Check invalid values first

	for v in $((min - 1)) $((max + 1)); do

		${ns_a} ip link add vti4_a mtu ${v} type vti local ${veth4_a_addr} remote ${veth4_b_addr} key 10 2>/dev/null

		run_cmd ${ns_a} ip link add vti4_a mtu ${v} type vti local ${veth4_a_addr} remote ${veth4_b_addr} key 10

		# This can fail, or MTU can be adjusted to a proper value

		[ $? -ne 0 ] && continue

		mtu="$(link_get_mtu "${ns_a}" vti4_a)"
@@ -920,14 +941,14 @@ test_pmtu_vti4_link_add_mtu() { 
			err "  vti tunnel created with invalid MTU ${mtu}"

			fail=1

		fi

		${ns_a} ip link del vti4_a

		run_cmd ${ns_a} ip link del vti4_a

	done



	# Now check valid values

	for v in ${min} 1300 ${max}; do

		${ns_a} ip link add vti4_a mtu ${v} type vti local ${veth4_a_addr} remote ${veth4_b_addr} key 10

		run_cmd ${ns_a} ip link add vti4_a mtu ${v} type vti local ${veth4_a_addr} remote ${veth4_b_addr} key 10

		mtu="$(link_get_mtu "${ns_a}" vti4_a)"

		${ns_a} ip link del vti4_a

		run_cmd ${ns_a} ip link del vti4_a

		if [ "${mtu}" != "${v}" ]; then

			err "  vti MTU ${mtu} doesn't match configured value ${v}"

			fail=1
@@ -940,9 +961,9 @@ test_pmtu_vti4_link_add_mtu() { 
test_pmtu_vti6_link_add_mtu() {

	setup namespaces || return 2



	${ns_a} ip link add vti6_a type vti6 local ${veth6_a_addr} remote ${veth6_b_addr} key 10

	run_cmd ${ns_a} ip link add vti6_a type vti6 local ${veth6_a_addr} remote ${veth6_b_addr} key 10

	[ $? -ne 0 ] && err "  vti6 not supported" && return 2

	${ns_a} ip link del vti6_a

	run_cmd ${ns_a} ip link del vti6_a



	fail=0
@@ -950,7 +971,7 @@ test_pmtu_vti6_link_add_mtu() { 
	max=$((65535 - 40))

	# Check invalid values first

	for v in $((min - 1)) $((max + 1)); do

		${ns_a} ip link add vti6_a mtu ${v} type vti6 local ${veth6_a_addr} remote ${veth6_b_addr} key 10 2>/dev/null

		run_cmd ${ns_a} ip link add vti6_a mtu ${v} type vti6 local ${veth6_a_addr} remote ${veth6_b_addr} key 10

		# This can fail, or MTU can be adjusted to a proper value

		[ $? -ne 0 ] && continue

		mtu="$(link_get_mtu "${ns_a}" vti6_a)"
@@ -958,14 +979,14 @@ test_pmtu_vti6_link_add_mtu() { 
			err "  vti6 tunnel created with invalid MTU ${v}"

			fail=1

		fi

		${ns_a} ip link del vti6_a

		run_cmd ${ns_a} ip link del vti6_a

	done



	# Now check valid values

	for v in 68 1280 1300 $((65535 - 40)); do

		${ns_a} ip link add vti6_a mtu ${v} type vti6 local ${veth6_a_addr} remote ${veth6_b_addr} key 10

		run_cmd ${ns_a} ip link add vti6_a mtu ${v} type vti6 local ${veth6_a_addr} remote ${veth6_b_addr} key 10

		mtu="$(link_get_mtu "${ns_a}" vti6_a)"

		${ns_a} ip link del vti6_a

		run_cmd ${ns_a} ip link del vti6_a

		if [ "${mtu}" != "${v}" ]; then

			err "  vti6 MTU ${mtu} doesn't match configured value ${v}"

			fail=1
@@ -978,19 +999,19 @@ test_pmtu_vti6_link_add_mtu() { 
test_pmtu_vti6_link_change_mtu() {

	setup namespaces || return 2



	${ns_a} ip link add dummy0 mtu 1500 type dummy

	run_cmd ${ns_a} ip link add dummy0 mtu 1500 type dummy

	[ $? -ne 0 ] && err "  dummy not supported" && return 2

	${ns_a} ip link add dummy1 mtu 3000 type dummy

	${ns_a} ip link set dummy0 up

	${ns_a} ip link set dummy1 up

	run_cmd ${ns_a} ip link add dummy1 mtu 3000 type dummy

	run_cmd ${ns_a} ip link set dummy0 up

	run_cmd ${ns_a} ip link set dummy1 up



	${ns_a} ip addr add ${dummy6_0_addr}/${dummy6_mask} dev dummy0

	${ns_a} ip addr add ${dummy6_1_addr}/${dummy6_mask} dev dummy1

	run_cmd ${ns_a} ip addr add ${dummy6_0_addr}/${dummy6_mask} dev dummy0

	run_cmd ${ns_a} ip addr add ${dummy6_1_addr}/${dummy6_mask} dev dummy1



	fail=0



	# Create vti6 interface bound to device, passing MTU, check it

	${ns_a} ip link add vti6_a mtu 1300 type vti6 remote ${dummy6_0_addr} local ${dummy6_0_addr}

	run_cmd ${ns_a} ip link add vti6_a mtu 1300 type vti6 remote ${dummy6_0_addr} local ${dummy6_0_addr}

	mtu="$(link_get_mtu "${ns_a}" vti6_a)"

	if [ ${mtu} -ne 1300 ]; then

		err "  vti6 MTU ${mtu} doesn't match configured value 1300"
@@ -999,7 +1020,7 @@ test_pmtu_vti6_link_change_mtu() { 


	# Move to another device with different MTU, without passing MTU, check

	# MTU is adjusted

	${ns_a} ip link set vti6_a type vti6 remote ${dummy6_1_addr} local ${dummy6_1_addr}

	run_cmd ${ns_a} ip link set vti6_a type vti6 remote ${dummy6_1_addr} local ${dummy6_1_addr}

	mtu="$(link_get_mtu "${ns_a}" vti6_a)"

	if [ ${mtu} -ne $((3000 - 40)) ]; then

		err "  vti MTU ${mtu} is not dummy MTU 3000 minus IPv6 header length"
@@ -1007,7 +1028,7 @@ test_pmtu_vti6_link_change_mtu() { 
	fi



	# Move it back, passing MTU, check MTU is not overridden

	${ns_a} ip link set vti6_a mtu 1280 type vti6 remote ${dummy6_0_addr} local ${dummy6_0_addr}

	run_cmd ${ns_a} ip link set vti6_a mtu 1280 type vti6 remote ${dummy6_0_addr} local ${dummy6_0_addr}

	mtu="$(link_get_mtu "${ns_a}" vti6_a)"

	if [ ${mtu} -ne 1280 ]; then

		err "  vti6 MTU ${mtu} doesn't match configured value 1280"
@@ -1052,7 +1073,7 @@ test_cleanup_vxlanX_exception() { 
	# Fill exception cache for multiple CPUs (2)

	# we can always use inner IPv4 for that

	for cpu in ${cpu_list}; do

		taskset --cpu-list ${cpu} ${ns_a} ping -q -M want -i 0.1 -w 1 -s $((${ll_mtu} + 500)) ${tunnel4_b_addr} > /dev/null

		run_cmd taskset --cpu-list ${cpu} ${ns_a} ping -q -M want -i 0.1 -w 1 -s $((${ll_mtu} + 500)) ${tunnel4_b_addr}

	done



	${ns_a} ip link del dev veth_A-R1 &
@@ -1084,29 +1105,33 @@ usage() { 
	exit 1

}



################################################################################

#

exitcode=0

desc=0

IFS="	

"



tracing=0

for arg do

	if [ "${arg}" != "${arg#--*}" ]; then

		opt="${arg#--}"

		if [ "${opt}" = "trace" ]; then

			if which tcpdump > /dev/null 2>&1; then

				tracing=1

while getopts :ptv o

do

	case $o in

	p) PAUSE_ON_FAIL=yes;;

	v) VERBOSE=1;;

	t) if which tcpdump > /dev/null 2>&1; then

		TRACING=1

	   else

		echo "=== tcpdump not available, tracing disabled"

	   fi

		else

			usage

		fi

	else

		# Check first that all requested tests are available before

		# running any

	   ;;

	*) usage;;

	esac

done

shift $(($OPTIND-1))



IFS="	

"



for arg do

	# Check first that all requested tests are available before running any

	command -v > /dev/null "test_${arg}" || { echo "=== Test ${arg} not found"; usage; }

	fi

done



trap cleanup EXIT
@@ -1124,6 +1149,11 @@ for t in ${tests}; do 


	(

		unset IFS



		if [ "$VERBOSE" = "1" ]; then

			printf "\n##########################################################################\n\n"

		fi



		eval test_${name}

		ret=$?

		cleanup
@@ -1132,6 +1162,11 @@ for t in ${tests}; do 
			printf "TEST: %-60s  [ OK ]\n" "${t}"

		elif [ $ret -eq 1 ]; then

			printf "TEST: %-60s  [FAIL]\n" "${t}"

			if [ "${PAUSE_ON_FAIL}" = "yes" ]; then

				echo

				echo "Pausing. Hit enter to continue"

				read a

			fi

			err_flush

			exit 1

		elif [ $ret -eq 2 ]; then

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