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selftests: netdevsim: Add FIB notification tests for nexthop objects

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Add IPv4 and IPv6 test cases that program a route that uses a nexthop
object and check that two notifications are emitted for it, with the
second one carrying the RTM_F_TRAP flag.

The new route_nexthop_check() helper follows the same pattern as the
existing route_{addition,deletion,replacement}_check() helpers.

Without "ipv6: Hold RCU when emitting route hardware flags
notification", the IPv6 test case passes, but triggers suspicious RCU
usage splats. The IPv4 test case is added for completeness.

Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Eric Dumazet <edumazet@kernel.org>
Reviewed-by: David Ahern <dsahern@kernel.org>
Link: https://patch.msgid.link/20261019140337.2886875-3-idosch@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Ido Schimmel 2026-10-19 17:03:37 +03:00 committed by Jakub Kicinski
parent 7c9cb1edaf
commit b5dc3fde8b
1 changed files with 66 additions and 0 deletions
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66
tools/testing/selftests/drivers/net/netdevsim/fib_notifications.sh
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@ -8,10 +8,12 @@ ALL_TESTS="
ipv4_route_deletion_test
ipv4_route_replacement_test
ipv4_route_offload_failed_test
ipv4_route_nexthop_test
ipv6_route_addition_test
ipv6_route_deletion_test
ipv6_route_replacement_test
ipv6_route_offload_failed_test
ipv6_route_nexthop_test
"
NETDEVSIM_PATH=/sys/bus/netdevsim/
@ -269,6 +271,50 @@ ipv4_route_offload_failed_test()
log_test "IPv4 route offload failed"
}
route_nexthop_check()
{
local ip=$1; shift
local route=$1; shift
local nhid=$1; shift
local expected_num_notifications=$1; shift
local outfile
ip netns exec testns1 sysctl -qw net.$ip.fib_notify_on_flag_change=1
outfile=$(mktemp)
$IP monitor route &> $outfile &
sleep 1
$IP route add $route nhid $nhid
sleep 1
kill_process %%
route_notify_check $outfile $expected_num_notifications
rm -f $outfile
$IP route del $route nhid $nhid
}
ipv4_route_nexthop_test()
{
RET=0
local ip="ipv4"
local route=192.0.2.0/24
local nhid=1
$IP -4 nexthop add id $nhid dev dummy1
# Make sure two notifications will be emitted for a programmed route
# that uses a nexthop object.
local expected_num_notifications=2
route_nexthop_check $ip $route $nhid $expected_num_notifications
$IP nexthop del id $nhid
log_test "IPv4 route with nexthop object"
}
ipv6_route_addition_test()
{
RET=0
@ -385,6 +431,26 @@ ipv6_route_offload_failed_test()
log_test "IPv6 route offload failed"
}
ipv6_route_nexthop_test()
{
RET=0
local ip="ipv6"
local route=2001:db8:1::/64
local nhid=1
$IP -6 nexthop add id $nhid dev dummy1
# Make sure two notifications will be emitted for a programmed route
# that uses a nexthop object.
local expected_num_notifications=2
route_nexthop_check $ip $route $nhid $expected_num_notifications
$IP nexthop del id $nhid
log_test "IPv6 route with nexthop object"
}
setup_prepare()
{
modprobe netdevsim &> /dev/null