netdev - Re: [patch net-next RFC v2 02/11] devlink: Add support for resource abstraction

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Date:   Sat, 18 Nov 2017 11:34:09 -0700
From:   David Ahern <dsa@...ulusnetworks.com>
To:     Jiri Pirko <jiri@...nulli.us>, netdev@...r.kernel.org
Cc:     davem@...emloft.net, mlxsw@...lanox.com, andrew@...n.ch,
        vivien.didelot@...oirfairelinux.com, f.fainelli@...il.com,
        michael.chan@...adcom.com, ganeshgr@...lsio.com,
        saeedm@...lanox.com, matanb@...lanox.com, leonro@...lanox.com,
        idosch@...lanox.com, jakub.kicinski@...ronome.com, ast@...nel.org,
        daniel@...earbox.net, simon.horman@...ronome.com,
        pieter.jansenvanvuuren@...ronome.com, john.hurley@...ronome.com,
        alexander.h.duyck@...el.com, linville@...driver.com,
        gospo@...adcom.com, steven.lin1@...adcom.com, yuvalm@...lanox.com,
        ogerlitz@...lanox.com, roopa@...ulusnetworks.com
Subject: Re: [patch net-next RFC v2 02/11] devlink: Add support for resource
 abstraction

On 11/14/17 9:18 AM, Jiri Pirko wrote:
> diff --git a/include/net/devlink.h b/include/net/devlink.h
> index 4d2c6fc..960e80a 100644
> --- a/include/net/devlink.h
> +++ b/include/net/devlink.h
...

> @@ -469,6 +523,32 @@ devlink_dpipe_match_put(struct sk_buff *skb,
>  	return 0;
>  }
>  
> +static inline int
> +devlink_resource_register(struct devlink *devlink,
> +			  const char *resource_name,
> +			  bool top_hierarchy,
> +			  bool reload_required,
> +			  u64 resource_size,
> +			  u64 resource_id,
> +			  u64 parent_resource_id,
> +			  struct devlink_resource_ops *resource_ops)
> +{
> +	return 0;
> +}
> +
> +static inline void
> +devlink_resources_unregister(struct devlink *devlink,
> +			     struct devlink_resource *resource)
> +{
> +}
> +
> +static inline int
> +devlink_resource_size_get(struct devlink *devlink, u64 resource_id,
> +			  u64 *p_resource_size)
> +{
> +	return -EINVAL;

It's compiled out so -EOPNOTSUPP seems more appropriate.



> diff --git a/net/core/devlink.c b/net/core/devlink.c
> index 0114dfc..6ae644f 100644
> --- a/net/core/devlink.c
> +++ b/net/core/devlink.c
> +static int devlink_nl_cmd_resource_set(struct sk_buff *skb,
> +				       struct genl_info *info)
> +{
> +	struct devlink *devlink = info->user_ptr[0];
> +	struct devlink_resource *resource;
> +	u64 resource_id;
> +	u64 size;
> +	int err;
> +
> +	if (!info->attrs[DEVLINK_ATTR_RESOURCE_ID] ||
> +	    !info->attrs[DEVLINK_ATTR_RESOURCE_SIZE])
> +		return -EINVAL;

several of the of the DEVLINK_ATTR_RESOURCE attributes are kernel to
user only (e.g., DEVLINK_ATTR_RESOURCE_SIZE_NEW and
DEVLINK_ATTR_RESOURCE_RELOAD_REQUIRED), so if they are given by the user
that should be an error too right?


> +	resource_id = nla_get_u64(info->attrs[DEVLINK_ATTR_RESOURCE_ID]);

I don't see where these attributes are validated for proper size.

> +
> +	resource = devlink_resource_find(devlink, NULL, resource_id);
> +	if (!resource)
> +		return -EINVAL;
> +
> +	if (!resource->resource_ops->size_validate)
> +		return -EINVAL;

genl_info has extack; please add user messages for the above failures.


> +
> +	size = nla_get_u64(info->attrs[DEVLINK_ATTR_RESOURCE_SIZE]);
> +	err = resource->resource_ops->size_validate(devlink, size,
> +						    &resource->resource_list,
> +						    info->extack);
> +	if (err)
> +		return err;
> +
> +	resource->size_new = size;
> +	return 0;
> +}
> +