selftests: rtnetlink.sh: remove esp4_offload after test

The esp4_offload module, loaded during IPsec offload tests, should
be reset to its default settings after testing.
Otherwise, leaving it enabled could unintentionally affect subsequence
test cases by keeping offload active.

Without this fix:
$ lsmod | grep offload; ./rtnetlink.sh -t kci_test_ipsec_offload ; lsmod | grep offload;
PASS: ipsec_offload
esp4_offload           12288  0
esp4                   32768  1 esp4_offload

With this fix:
$ lsmod | grep offload; ./rtnetlink.sh -t kci_test_ipsec_offload ; lsmod | grep offload;
PASS: ipsec_offload

Fixes: 2766a11161cc ("selftests: rtnetlink: add ipsec offload API test")
Signed-off-by: Xiumei Mu <xmu@redhat.com>
Reviewed-by: Shannon Nelson <sln@onemain.com>
Reviewed-by: Hangbin Liu <liuhangbin@gmail.com>
Link: https://patch.msgid.link/6d3a1d777c4de4eb0ca94ced9e77be8d48c5b12f.1753415428.git.xmu@redhat.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/tools/testing/selftests/net/rtnetlink.sh b/tools/testing/selftests/net/rtnetlink.sh
index 7020f988f6598d5e36b233ef4307e5989392c09c..d6c00efeb66423be75ebb6bd55f850f0623f3e97 100755 (executable)
--- a/tools/testing/selftests/net/rtnetlink.sh
+++ b/tools/testing/selftests/net/rtnetlink.sh
@@ -720,6 +720,11 @@ kci_test_ipsec_offload()
        sysfsf=$sysfsd/ipsec
        sysfsnet=/sys/bus/netdevsim/devices/netdevsim0/net/
        probed=false
+       esp4_offload_probed_default=false
+
+       if lsmod | grep -q esp4_offload; then
+               esp4_offload_probed_default=true
+       fi
 
        if ! mount | grep -q debugfs; then
                mount -t debugfs none /sys/kernel/debug/ &> /dev/null
@@ -813,6 +818,7 @@ EOF
        fi
 
        # clean up any leftovers
+       ! "$esp4_offload_probed_default" && lsmod | grep -q esp4_offload && rmmod esp4_offload
        echo 0 > /sys/bus/netdevsim/del_device
        $probed && rmmod netdevsim