On Thu, Jul 29, 2021 at 01:22:58PM +0200, Jiri Pirko wrote:

Thu, Jul 29, 2021 at 10:15:25AM CEST, leon@kernel.org wrote:

quoted

From: Leon Romanovsky <leonro@nvidia.com>

<...>

quoted

diff --git a/net/core/devlink.c b/net/core/devlink.c
index b596a971b473..54e2a0375539 100644
--- a/net/core/devlink.c
+++ b/net/core/devlink.c

@@ -3801,8 +3801,9 @@ static void devlink_param_notify(struct devlink *devlink,

				 struct devlink_param_item *param_item,
				 enum devlink_command cmd);

-static void devlink_reload_netns_change(struct devlink *devlink,
-					struct net *dest_net)
+static void devlink_params_notify(struct devlink *devlink, struct net *dest_net,

Please name it differently. This function notifies not only the params,
but the devlink instance itself as well.

I'm open for suggestion. What did you have in mind?

quoted

+				  struct net *curr_net,
+				  enum devlink_command cmd)
{
	struct devlink_param_item *param_item;

@@ -3812,17 +3813,17 @@ static void devlink_reload_netns_change(struct devlink *devlink,

	 * reload process so the notifications are generated separatelly.
	 */

-	list_for_each_entry(param_item, &devlink->param_list, list)
-		devlink_param_notify(devlink, 0, param_item,
-				     DEVLINK_CMD_PARAM_DEL);
-	devlink_notify(devlink, DEVLINK_CMD_DEL);
+	if (!dest_net || net_eq(dest_net, curr_net))
+		return;

-	__devlink_net_set(devlink, dest_net);
+	if (cmd == DEVLINK_CMD_PARAM_NEW)
+		devlink_notify(devlink, DEVLINK_CMD_NEW);

This is quite odd. According to PARAMS cmd you decife devlink CMD.

Just have bool arg which would help you select both
DEVLINK_CMD_PARAM_NEW/DEL and DEVLINK_CMD_NEW/DEL

The patch is quite misleading, but the final result looks neat:

   3847 static void devlink_params_notify(struct devlink *devlink, struct net *dest_net,
   3848                                   struct net *curr_net,
   3849                                   enum devlink_command cmd)
   3850 {
   3851         struct devlink_param_item *param_item;
   3852 
   3853         /* Userspace needs to be notified about devlink objects
   3854          * removed from original and entering new network namespace.
   3855          * The rest of the devlink objects are re-created during
   3856          * reload process so the notifications are generated separatelly.
   3857          */
   3858 
   3859         if (!dest_net || net_eq(dest_net, curr_net))
   3860                 return;
   3861 
   3862         if (cmd == DEVLINK_CMD_PARAM_NEW)
   3863                 devlink_notify(devlink, DEVLINK_CMD_NEW);
   3864 
   3865         list_for_each_entry(param_item, &devlink->param_list, list)
   3866                 devlink_param_notify(devlink, 0, param_item, cmd);
   3867 
   3868         if (cmd == DEVLINK_CMD_PARAM_DEL)
   3869                 devlink_notify(devlink, DEVLINK_CMD_DEL);
   3870 }


So as you can see in line 3866, we anyway will need to provide "cmd", so
do you suggest to add extra two bool variables to the function signature
to avoid "cmd == DEVLINK_CMD_PARAM_NEW" and "cmd == DEVLINK_CMD_PARAM_DEL" ifs?

Thanks