netdev - [patch net-next 2/2] devlink: warn about existing entities during reload-reinit

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Message-ID: <20231128115255.773377-3-jiri@resnulli.us>
Date: Tue, 28 Nov 2023 12:52:55 +0100
From: Jiri Pirko <jiri@...nulli.us>
To: netdev@...r.kernel.org
Cc: kuba@...nel.org,
	pabeni@...hat.com,
	davem@...emloft.net,
	edumazet@...gle.com,
	jacob.e.keller@...el.com,
	corbet@....net,
	sachin.bahadur@...el.com,
	przemyslaw.kitszel@...el.com
Subject: [patch net-next 2/2] devlink: warn about existing entities during reload-reinit

From: Jiri Pirko <jiri@...dia.com>

During reload-reinit, all entities except for params, resources, regions
and health reporter should be removed and re-added. Add a warning to
be triggered in case the driver behaves differently.

Signed-off-by: Jiri Pirko <jiri@...dia.com>
---
 net/devlink/dev.c | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/net/devlink/dev.c b/net/devlink/dev.c
index ea6a92f2e6a2..918a0395b03e 100644
--- a/net/devlink/dev.c
+++ b/net/devlink/dev.c
@@ -425,6 +425,18 @@ static void devlink_reload_netns_change(struct devlink *devlink,
 	devlink_rel_nested_in_notify(devlink);
 }
 
+static void devlink_reload_reinit_sanity_check(struct devlink *devlink)
+{
+	WARN_ON(!list_empty(&devlink->trap_policer_list));
+	WARN_ON(!list_empty(&devlink->trap_group_list));
+	WARN_ON(!list_empty(&devlink->trap_list));
+	WARN_ON(!list_empty(&devlink->dpipe_table_list));
+	WARN_ON(!list_empty(&devlink->sb_list));
+	WARN_ON(!list_empty(&devlink->rate_list));
+	WARN_ON(!list_empty(&devlink->linecard_list));
+	WARN_ON(!xa_empty(&devlink->ports));
+}
+
 int devlink_reload(struct devlink *devlink, struct net *dest_net,
 		   enum devlink_reload_action action,
 		   enum devlink_reload_limit limit,
@@ -452,8 +464,10 @@ int devlink_reload(struct devlink *devlink, struct net *dest_net,
 	if (dest_net && !net_eq(dest_net, curr_net))
 		devlink_reload_netns_change(devlink, curr_net, dest_net);
 
-	if (action == DEVLINK_RELOAD_ACTION_DRIVER_REINIT)
+	if (action == DEVLINK_RELOAD_ACTION_DRIVER_REINIT) {
 		devlink_params_driverinit_load_new(devlink);
+		devlink_reload_reinit_sanity_check(devlink);
+	}
 
 	err = devlink->ops->reload_up(devlink, action, limit, actions_performed, extack);
 	devlink_reload_failed_set(devlink, !!err);
-- 
2.41.0