selftests: fib_tests: Count all trace point invocations

The tests rely on the IPv{4,6} FIB trace points being triggered once for
each forwarded packet. If receive processing is deferred to the
ksoftirqd task these invocations will not be counted and the tests will
fail. Fix by specifying the '-a' flag to avoid perf from filtering on
the mausezahn task.

Before:

 # ./fib_tests.sh -t ipv4_mpath_list

 IPv4 multipath list receive tests
     TEST: Multipath route hit ratio (.68)                               [FAIL]

 # ./fib_tests.sh -t ipv6_mpath_list

 IPv6 multipath list receive tests
     TEST: Multipath route hit ratio (.27)                               [FAIL]

After:

 # ./fib_tests.sh -t ipv4_mpath_list

 IPv4 multipath list receive tests
     TEST: Multipath route hit ratio (1.00)                              [ OK ]

 # ./fib_tests.sh -t ipv6_mpath_list

 IPv6 multipath list receive tests
     TEST: Multipath route hit ratio (.99)                               [ OK ]

Fixes: 8ae9efb859c0 ("selftests: fib_tests: Add multipath list receive tests")
Reported-by: kernel test robot <oliver.sang@intel.com>
Closes: https://lore.kernel.org/netdev/202309191658.c00d8b8-oliver.sang@intel.com/
Tested-by: kernel test robot <oliver.sang@intel.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Tested-by: Sriram Yagnaraman <sriram.yagnaraman@est.tech>
Link: https://lore.kernel.org/r/20231010132113.3014691-3-idosch@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/tools/testing/selftests/net/fib_tests.sh b/tools/testing/selftests/net/fib_tests.sh
index 0dbb26b4fa4a15fb73440e657800c7a63dba255c..66d0db7a2614d32e24e04a19d03a016a3b2d293a 100755 (executable)
--- a/tools/testing/selftests/net/fib_tests.sh
+++ b/tools/testing/selftests/net/fib_tests.sh
@@ -2452,7 +2452,7 @@ ipv4_mpath_list_test()
        # 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"
+       run_cmd "perf stat -a -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 $diff
@@ -2497,7 +2497,7 @@ ipv6_mpath_list_test()
        # words, the FIB lookup tracepoint needs to be triggered for every
        # packet.
        local t0_rx_pkts=$(link_stats_get ns2 veth2 rx packets)
-       run_cmd "perf stat -e fib6:fib6_table_lookup --filter 'err == 0' -j -o $tmp_file -- $cmd"
+       run_cmd "perf stat -a -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