iwlwifi: provide RX page order

When the pages are to be used by front-end, it may need
to know the page order, provide it.
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

drivers/net/wireless/iwlwifi/iwl-trans.h

@@ -274,6 +274,7 @@ struct iwl_rx_cmd_buffer {
 	struct page *_page;
 	int _offset;
 	bool _page_stolen;
+	u32 _rx_page_order;
 	unsigned int truesize;
 };
 
@@ -294,6 +295,11 @@ static inline struct page *rxb_steal_page(struct iwl_rx_cmd_buffer *r)
 	return r->_page;
 }
 
+static inline void iwl_free_rxb(struct iwl_rx_cmd_buffer *r)
+{
+	__free_pages(r->_page, r->_rx_page_order);
+}
+
 #define MAX_NO_RECLAIM_CMDS	6
 
 #define IWL_MASK(lo, hi) ((1 << (hi)) | ((1 << (hi)) - (1 << (lo))))

drivers/net/wireless/iwlwifi/pcie/rx.c

@@ -594,6 +594,7 @@ static void iwl_pcie_rx_handle_rb(struct iwl_trans *trans,
 		int index, cmd_index, err, len;
 		struct iwl_rx_cmd_buffer rxcb = {
 			._offset = offset,
+			._rx_page_order = trans_pcie->rx_page_order,
 			._page = rxb->page,
 			._page_stolen = false,
 			.truesize = max_len,