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selftests/net: fix waiting time for ipv6_gc test in fib_tests.sh.

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ipv6_gc fails occasionally. According to the study, fib6_run_gc() using
jiffies_round() to round the GC interval could increase the waiting time up
to 750ms (3/4 seconds). The timer has a granularity of 512ms at the range
4s to 32s. That means a route with an expiration time E seconds can wait
for more than E * 2 + 1 seconds if the GC interval is also E seconds.

E * 2 + 2 seconds should be enough for waiting for removing routes.

Also remove a check immediately after replacing 5 routes since it is very
likely to remove some of routes before completing the last route with a
slow environment.

Signed-off-by: Kui-Feng Lee <thinker.li@gmail.com>
Link: https://lore.kernel.org/r/20240305183949.258473-1-thinker.li@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Kui-Feng Lee 2024-03-05 10:39:49 -08:00 committed by Jakub Kicinski
parent 8edbd39601
commit 4af9a0bee1
1 changed files with 7 additions and 10 deletions
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17
tools/testing/selftests/net/fib_tests.sh
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@ -789,6 +789,7 @@ fib6_gc_test()
set -e
EXPIRE=5
GC_WAIT_TIME=$((EXPIRE * 2 + 2))
# Check expiration of routes every $EXPIRE seconds (GC)
$NS_EXEC sysctl -wq net.ipv6.route.gc_interval=$EXPIRE
@ -805,7 +806,7 @@ fib6_gc_test()
$IP -6 route add 2001:20::$i \
via 2001:10::2 dev dummy_10 expires $EXPIRE
done
sleep $(($EXPIRE * 2 + 1))
sleep $GC_WAIT_TIME
$NS_EXEC sysctl -wq net.ipv6.route.flush=1
check_rt_num 0 $($IP -6 route list |grep expires|wc -l)
log_test $ret 0 "ipv6 route garbage collection"
@ -823,7 +824,8 @@ fib6_gc_test()
$IP -6 route add 2001:20::$i \
via 2001:10::2 dev dummy_10 expires $EXPIRE
done
sleep $(($EXPIRE * 2 + 1))
# Wait for GC
sleep $GC_WAIT_TIME
check_rt_num 0 $($IP -6 route list |grep expires|wc -l)
log_test $ret 0 "ipv6 route garbage collection (with permanent routes)"
@ -840,10 +842,8 @@ fib6_gc_test()
$IP -6 route replace 2001:20::$i \
via 2001:10::2 dev dummy_10 expires $EXPIRE
done
check_rt_num_clean 5 $($IP -6 route list |grep expires|wc -l) || return
# Wait for GC
sleep $(($EXPIRE * 2 + 1))
$NS_EXEC sysctl -wq net.ipv6.route.flush=1
sleep $GC_WAIT_TIME
check_rt_num 0 $($IP -6 route list |grep expires|wc -l)
log_test $ret 0 "ipv6 route garbage collection (replace with expires)"
@ -863,8 +863,7 @@ fib6_gc_test()
check_rt_num_clean 0 $($IP -6 route list |grep expires|wc -l) || return
# Wait for GC
sleep $(($EXPIRE * 2 + 1))
sleep $GC_WAIT_TIME
check_rt_num 5 $($IP -6 route list |grep -v expires|grep 2001:20::|wc -l)
log_test $ret 0 "ipv6 route garbage collection (replace with permanent)"
@ -901,9 +900,7 @@ fib6_gc_test()
check_rt_num_clean 1 $($IP -6 route list|grep expires|wc -l) || return
# Wait for GC
sleep $(($EXPIRE * 2 + 1))
$NS_EXEC sysctl -wq net.ipv6.route.flush=1
sleep $GC_WAIT_TIME
check_rt_num 0 $($IP -6 route list |grep expires|wc -l)
log_test $ret 0 "ipv6 route garbage collection (RA message)"