netdev - Re: [PATCH net-next 5/6] devlink: Reshuffle resource registration logic

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Date:   Wed, 17 Nov 2021 20:49:56 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Leon Romanovsky <leon@...nel.org>
Cc:     "David S . Miller" <davem@...emloft.net>,
        Leon Romanovsky <leonro@...dia.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Andrew Lunn <andrew@...n.ch>, Aya Levin <ayal@...lanox.com>,
        Claudiu Manoil <claudiu.manoil@....com>, drivers@...sando.io,
        Florian Fainelli <f.fainelli@...il.com>,
        Ido Schimmel <idosch@...dia.com>,
        intel-wired-lan@...ts.osuosl.org,
        Ioana Ciornei <ioana.ciornei@....com>,
        Jesse Brandeburg <jesse.brandeburg@...el.com>,
        Jiri Pirko <jiri@...dia.com>, linux-kernel@...r.kernel.org,
        linux-rdma@...r.kernel.org,
        Michael Chan <michael.chan@...adcom.com>,
        netdev@...r.kernel.org, oss-drivers@...igine.com,
        Saeed Mahameed <saeedm@...dia.com>,
        Shannon Nelson <snelson@...sando.io>,
        Simon Horman <simon.horman@...igine.com>,
        Taras Chornyi <tchornyi@...vell.com>,
        Tariq Toukan <tariqt@...dia.com>,
        Tony Nguyen <anthony.l.nguyen@...el.com>,
        UNGLinuxDriver@...rochip.com,
        Vivien Didelot <vivien.didelot@...il.com>,
        Vladimir Oltean <vladimir.oltean@....com>
Subject: Re: [PATCH net-next 5/6] devlink: Reshuffle resource registration
 logic

On Wed, 17 Nov 2021 20:26:21 +0200 Leon Romanovsky wrote:
> -	top_hierarchy = parent_resource_id == DEVLINK_RESOURCE_ID_PARENT_TOP;
> -
> -	mutex_lock(&devlink->lock);
> -	resource = devlink_resource_find(devlink, NULL, resource_id);
> -	if (resource) {
> -		err = -EINVAL;
> -		goto out;
> -	}
> +	WARN_ON(devlink_resource_find(devlink, NULL, resource_id));

This is not atomic with the add now.

>  	resource = kzalloc(sizeof(*resource), GFP_KERNEL);
>  	if (!resource) {
> @@ -9851,7 +9843,17 @@ int devlink_resource_register(struct devlink *devlink,
>  		goto out;
>  	}
>  
> -	if (top_hierarchy) {
> +	resource->name = resource_name;
> +	resource->size = resource_size;
> +	resource->size_new = resource_size;
> +	resource->id = resource_id;
> +	resource->size_valid = true;
> +	memcpy(&resource->size_params, size_params,
> +	       sizeof(resource->size_params));
> +	INIT_LIST_HEAD(&resource->resource_list);
> +
> +	mutex_lock(&devlink->lock);