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selftests: pmtu: add explicit tests for PMTU exceptions cleanup

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Add a couple of new tests, explicitly checking that the kernel
timely releases PMTU exceptions on related device removal.
This is mostly a regression test vs the issue fixed by
commit f5b51fe804 ("ipv6: route: purge exception on removal")

Only 2 new test cases have been added, instead of extending all
the existing ones, because the reproducer requires executing
several commands and would slow down too much the tests otherwise.

v2 -> v3:
 - more cleanup, still from Stefano

v1 -> v2:
 - several script cleanups, as suggested by Stefano

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paolo Abeni 2019-02-25 16:08:37 +01:00 committed by David S. Miller
parent 651eb32e56
commit b3cc4f8a8a
1 changed files with 67 additions and 1 deletions
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68
tools/testing/selftests/net/pmtu.sh
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@ -103,6 +103,15 @@
# and check that configured MTU is used on link creation and changes, and
# that MTU is properly calculated instead when MTU is not configured from
# userspace
#
# - cleanup_ipv4_exception
# Similar to pmtu_ipv4_vxlan4_exception, but explicitly generate PMTU
# exceptions on multiple CPUs and check that the veth device tear-down
# happens in a timely manner
#
# - cleanup_ipv6_exception
# Same as above, but use IPv6 transport from A to B
# Kselftest framework requirement - SKIP code is 4.
ksft_skip=4
@ -135,7 +144,9 @@ tests="
pmtu_vti6_default_mtu vti6: default MTU assignment
pmtu_vti4_link_add_mtu vti4: MTU setting on link creation
pmtu_vti6_link_add_mtu vti6: MTU setting on link creation
pmtu_vti6_link_change_mtu vti6: MTU changes on link changes"
pmtu_vti6_link_change_mtu vti6: MTU changes on link changes
cleanup_ipv4_exception ipv4: cleanup of cached exceptions
cleanup_ipv6_exception ipv6: cleanup of cached exceptions"
NS_A="ns-$(mktemp -u XXXXXX)"
NS_B="ns-$(mktemp -u XXXXXX)"
@ -1006,6 +1017,61 @@ test_pmtu_vti6_link_change_mtu() {
return ${fail}
}
check_command() {
cmd=${1}
if ! which ${cmd} > /dev/null 2>&1; then
err " missing required command: '${cmd}'"
return 1
fi
return 0
}
test_cleanup_vxlanX_exception() {
outer="${1}"
encap="vxlan"
ll_mtu=4000
check_command taskset || return 2
cpu_list=$(grep -m 2 processor /proc/cpuinfo | cut -d ' ' -f 2)
setup namespaces routing ${encap}${outer} || return 2
trace "${ns_a}" ${encap}_a "${ns_b}" ${encap}_b \
"${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \
"${ns_b}" veth_B-R1 "${ns_r1}" veth_R1-B
# Create route exception by exceeding link layer MTU
mtu "${ns_a}" veth_A-R1 $((${ll_mtu} + 1000))
mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000))
mtu "${ns_b}" veth_B-R1 ${ll_mtu}
mtu "${ns_r1}" veth_R1-B ${ll_mtu}
mtu "${ns_a}" ${encap}_a $((${ll_mtu} + 1000))
mtu "${ns_b}" ${encap}_b $((${ll_mtu} + 1000))
# 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
done
${ns_a} ip link del dev veth_A-R1 &
iplink_pid=$!
sleep 1
if [ "$(cat /proc/${iplink_pid}/cmdline 2>/dev/null | tr -d '\0')" = "iplinkdeldevveth_A-R1" ]; then
err " can't delete veth device in a timely manner, PMTU dst likely leaked"
return 1
fi
}
test_cleanup_ipv6_exception() {
test_cleanup_vxlanX_exception 6
}
test_cleanup_ipv4_exception() {
test_cleanup_vxlanX_exception 4
}
usage() {
echo
echo "$0 [OPTIONS] [TEST]..."