* If both this and page are %NULL, the buffer slot is currently free.
* @page: The associated page buffer, if any.
* If both this and skb are %NULL, the buffer slot is currently free.
* If both this and page are %NULL, the buffer slot is currently free.
* @page: The associated page buffer, if any.
* If both this and skb are %NULL, the buffer slot is currently free.
* @len: Buffer length, in bytes.
* @is_page: Indicates if @page is valid. If false, @skb is valid.
*/
* @len: Buffer length, in bytes.
* @is_page: Indicates if @page is valid. If false, @skb is valid.
*/