Merge branch 'netdevsim-allow-to-test-reload-failures'

Jiri Pirko says:

====================
netdevsim: allow to test reload failures

Allow user to test devlink reload failures: Fail to reload and fail
during reload.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 46 insertions, 0 deletions

diff --git a/drivers/net/netdevsim/dev.c b/drivers/net/netdevsim/dev.c
index fbc4cdcfe551ad..31d1752c703aa5 100644
--- a/drivers/net/netdevsim/dev.c
+++ b/drivers/net/netdevsim/dev.c
@@ -90,6 +90,10 @@ static int nsim_dev_debugfs_init(struct nsim_dev *nsim_dev)
 			    &nsim_dev->test1);
 	debugfs_create_file("take_snapshot", 0200, nsim_dev->ddir, nsim_dev,
 			    &nsim_dev_take_snapshot_fops);
+	debugfs_create_bool("dont_allow_reload", 0600, nsim_dev->ddir,
+			    &nsim_dev->dont_allow_reload);
+	debugfs_create_bool("fail_reload", 0600, nsim_dev->ddir,
+			    &nsim_dev->fail_reload);
 	return 0;
 }
 
@@ -478,6 +482,14 @@ static int nsim_dev_reload_down(struct devlink *devlink, bool netns_change,
 {
 	struct nsim_dev *nsim_dev = devlink_priv(devlink);
 
+	if (nsim_dev->dont_allow_reload) {
+		/* For testing purposes, user set debugfs dont_allow_reload
+		 * value to true. So forbid it.
+		 */
+		NL_SET_ERR_MSG_MOD(extack, "User forbidded reload for testing purposes");
+		return -EOPNOTSUPP;
+	}
+
 	nsim_dev_reload_destroy(nsim_dev);
 	return 0;
 }
@@ -487,6 +499,14 @@ static int nsim_dev_reload_up(struct devlink *devlink,
 {
 	struct nsim_dev *nsim_dev = devlink_priv(devlink);
 
+	if (nsim_dev->fail_reload) {
+		/* For testing purposes, user set debugfs fail_reload
+		 * value to true. Fail right away.
+		 */
+		NL_SET_ERR_MSG_MOD(extack, "User setup the reload to fail for testing purposes");
+		return -EINVAL;
+	}
+
 	return nsim_dev_reload_create(nsim_dev, extack);
 }
 
diff --git a/drivers/net/netdevsim/netdevsim.h b/drivers/net/netdevsim/netdevsim.h
index 8168a5475fe714..24358385d869a3 100644
--- a/drivers/net/netdevsim/netdevsim.h
+++ b/drivers/net/netdevsim/netdevsim.h
@@ -161,6 +161,8 @@ struct nsim_dev {
 	bool fw_update_status;
 	u32 max_macs;
 	bool test1;
+	bool dont_allow_reload;
+	bool fail_reload;
 	struct devlink_region *dummy_region;
 };
 
diff --git a/tools/testing/selftests/drivers/net/netdevsim/devlink.sh b/tools/testing/selftests/drivers/net/netdevsim/devlink.sh
index 69af99bd562b1e..de3174431b8ead 100755
--- a/tools/testing/selftests/drivers/net/netdevsim/devlink.sh
+++ b/tools/testing/selftests/drivers/net/netdevsim/devlink.sh
@@ -150,6 +150,30 @@ reload_test()
 	devlink dev reload $DL_HANDLE
 	check_err $? "Failed to reload"
 
+	echo "y"> $DEBUGFS_DIR/fail_reload
+	check_err $? "Failed to setup devlink reload to fail"
+
+	devlink dev reload $DL_HANDLE
+	check_fail $? "Unexpected success of devlink reload"
+
+	echo "n"> $DEBUGFS_DIR/fail_reload
+	check_err $? "Failed to setup devlink reload not to fail"
+
+	devlink dev reload $DL_HANDLE
+	check_err $? "Failed to reload after set not to fail"
+
+	echo "y"> $DEBUGFS_DIR/dont_allow_reload
+	check_err $? "Failed to forbid devlink reload"
+
+	devlink dev reload $DL_HANDLE
+	check_fail $? "Unexpected success of devlink reload"
+
+	echo "n"> $DEBUGFS_DIR/dont_allow_reload
+	check_err $? "Failed to re-enable devlink reload"
+
+	devlink dev reload $DL_HANDLE
+	check_err $? "Failed to reload after re-enable"
+
 	log_test "reload test"
 }