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selftests: fib_tests: Add multipath list receive tests
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The test uses perf stat to count the number of fib:fib_table_lookup
tracepoint hits for IPv4 and the number of fib6:fib6_table_lookup for
IPv6. The measured count is checked to be within 5% of the total number
of packets sent via veth1.

Signed-off-by: Sriram Yagnaraman <sriram.yagnaraman@est.tech>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Sriram Yagnaraman authored and David S. Miller committed Sep 1, 2023
1 parent 8423be8 commit 8ae9efb
Showing 1 changed file with 154 additions and 1 deletion.
155 changes: 154 additions & 1 deletion tools/testing/selftests/net/fib_tests.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -12,7 +12,8 @@ ksft_skip=4
TESTS="unregister down carrier nexthop suppress ipv6_notify ipv4_notify \
ipv6_rt ipv4_rt ipv6_addr_metric ipv4_addr_metric ipv6_route_metrics \
ipv4_route_metrics ipv4_route_v6_gw rp_filter ipv4_del_addr \
ipv6_del_addr ipv4_mangle ipv6_mangle ipv4_bcast_neigh fib6_gc_test"
ipv6_del_addr ipv4_mangle ipv6_mangle ipv4_bcast_neigh fib6_gc_test \
ipv4_mpath_list ipv6_mpath_list"

VERBOSE=0
PAUSE_ON_FAIL=no
Expand Down Expand Up @@ -2352,6 +2353,156 @@ ipv4_bcast_neigh_test()
cleanup
}

mpath_dep_check()
{
if [ ! -x "$(command -v mausezahn)" ]; then
echo "mausezahn command not found. Skipping test"
return 1
fi

if [ ! -x "$(command -v jq)" ]; then
echo "jq command not found. Skipping test"
return 1
fi

if [ ! -x "$(command -v bc)" ]; then
echo "bc command not found. Skipping test"
return 1
fi

if [ ! -x "$(command -v perf)" ]; then
echo "perf command not found. Skipping test"
return 1
fi

perf list fib:* | grep -q fib_table_lookup
if [ $? -ne 0 ]; then
echo "IPv4 FIB tracepoint not found. Skipping test"
return 1
fi

perf list fib6:* | grep -q fib6_table_lookup
if [ $? -ne 0 ]; then
echo "IPv6 FIB tracepoint not found. Skipping test"
return 1
fi

return 0
}

link_stats_get()
{
local ns=$1; shift
local dev=$1; shift
local dir=$1; shift
local stat=$1; shift

ip -n $ns -j -s link show dev $dev \
| jq '.[]["stats64"]["'$dir'"]["'$stat'"]'
}

list_rcv_eval()
{
local file=$1; shift
local expected=$1; shift

local count=$(tail -n 1 $file | jq '.["counter-value"] | tonumber | floor')
local ratio=$(echo "scale=2; $count / $expected" | bc -l)
local res=$(echo "$ratio >= 0.95" | bc)
[[ $res -eq 1 ]]
log_test $? 0 "Multipath route hit ratio ($ratio)"
}

ipv4_mpath_list_test()
{
echo
echo "IPv4 multipath list receive tests"

mpath_dep_check || return 1

route_setup

set -e
run_cmd "ip netns exec ns1 ethtool -K veth1 tcp-segmentation-offload off"

run_cmd "ip netns exec ns2 bash -c \"echo 20000 > /sys/class/net/veth2/gro_flush_timeout\""
run_cmd "ip netns exec ns2 bash -c \"echo 1 > /sys/class/net/veth2/napi_defer_hard_irqs\""
run_cmd "ip netns exec ns2 ethtool -K veth2 generic-receive-offload on"
run_cmd "ip -n ns2 link add name nh1 up type dummy"
run_cmd "ip -n ns2 link add name nh2 up type dummy"
run_cmd "ip -n ns2 address add 172.16.201.1/24 dev nh1"
run_cmd "ip -n ns2 address add 172.16.202.1/24 dev nh2"
run_cmd "ip -n ns2 neigh add 172.16.201.2 lladdr 00:11:22:33:44:55 nud perm dev nh1"
run_cmd "ip -n ns2 neigh add 172.16.202.2 lladdr 00:aa:bb:cc:dd:ee nud perm dev nh2"
run_cmd "ip -n ns2 route add 203.0.113.0/24
nexthop via 172.16.201.2 nexthop via 172.16.202.2"
run_cmd "ip netns exec ns2 sysctl -qw net.ipv4.fib_multipath_hash_policy=1"
set +e

local dmac=$(ip -n ns2 -j link show dev veth2 | jq -r '.[]["address"]')
local tmp_file=$(mktemp)
local cmd="ip netns exec ns1 mausezahn veth1 -a own -b $dmac
-A 172.16.101.1 -B 203.0.113.1 -t udp 'sp=12345,dp=0-65535' -q"

# Packets forwarded in a list using a multipath route must not reuse a
# cached result so that a flow always hits the same nexthop. In other
# words, the FIB lookup tracepoint needs to be triggered for every
# packet.
local t0_rx_pkts=$(link_stats_get ns2 veth2 rx packets)
run_cmd "perf stat -e fib:fib_table_lookup --filter 'err == 0' -j -o $tmp_file -- $cmd"
local t1_rx_pkts=$(link_stats_get ns2 veth2 rx packets)
local diff=$(echo $t1_rx_pkts - $t0_rx_pkts | bc -l)
list_rcv_eval $tmp_file $diff

rm $tmp_file
route_cleanup
}

ipv6_mpath_list_test()
{
echo
echo "IPv6 multipath list receive tests"

mpath_dep_check || return 1

route_setup

set -e
run_cmd "ip netns exec ns1 ethtool -K veth1 tcp-segmentation-offload off"

run_cmd "ip netns exec ns2 bash -c \"echo 20000 > /sys/class/net/veth2/gro_flush_timeout\""
run_cmd "ip netns exec ns2 bash -c \"echo 1 > /sys/class/net/veth2/napi_defer_hard_irqs\""
run_cmd "ip netns exec ns2 ethtool -K veth2 generic-receive-offload on"
run_cmd "ip -n ns2 link add name nh1 up type dummy"
run_cmd "ip -n ns2 link add name nh2 up type dummy"
run_cmd "ip -n ns2 -6 address add 2001:db8:201::1/64 dev nh1"
run_cmd "ip -n ns2 -6 address add 2001:db8:202::1/64 dev nh2"
run_cmd "ip -n ns2 -6 neigh add 2001:db8:201::2 lladdr 00:11:22:33:44:55 nud perm dev nh1"
run_cmd "ip -n ns2 -6 neigh add 2001:db8:202::2 lladdr 00:aa:bb:cc:dd:ee nud perm dev nh2"
run_cmd "ip -n ns2 -6 route add 2001:db8:301::/64
nexthop via 2001:db8:201::2 nexthop via 2001:db8:202::2"
run_cmd "ip netns exec ns2 sysctl -qw net.ipv6.fib_multipath_hash_policy=1"
set +e

local dmac=$(ip -n ns2 -j link show dev veth2 | jq -r '.[]["address"]')
local tmp_file=$(mktemp)
local cmd="ip netns exec ns1 mausezahn -6 veth1 -a own -b $dmac
-A 2001:db8:101::1 -B 2001:db8:301::1 -t udp 'sp=12345,dp=0-65535' -q"

# Packets forwarded in a list using a multipath route must not reuse a
# cached result so that a flow always hits the same nexthop. In other
# words, the FIB lookup tracepoint needs to be triggered for every
# packet.
local t0_rx_pkts=$(link_stats_get ns2 veth2 rx packets)
run_cmd "perf stat -e fib6:fib6_table_lookup --filter 'err == 0' -j -o $tmp_file -- $cmd"
local t1_rx_pkts=$(link_stats_get ns2 veth2 rx packets)
local diff=$(echo $t1_rx_pkts - $t0_rx_pkts | bc -l)
list_rcv_eval $tmp_file $diff

rm $tmp_file
route_cleanup
}

################################################################################
# usage

Expand Down Expand Up @@ -2433,6 +2584,8 @@ do
ipv6_mangle) ipv6_mangle_test;;
ipv4_bcast_neigh) ipv4_bcast_neigh_test;;
fib6_gc_test|ipv6_gc) fib6_gc_test;;
ipv4_mpath_list) ipv4_mpath_list_test;;
ipv6_mpath_list) ipv6_mpath_list_test;;

help) echo "Test names: $TESTS"; exit 0;;
esac
Expand Down

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