i40e/i40evf: save aq writeback for future inspection

Add the ability to save the AdminQ write back descriptor if a
caller supplies a buffer for it to be saved into.

Change-ID: I3d1301d26360b39a2d66dc8569e851f54133a3af
Signed-off-by: Shannon Nelson <shannon.nelson@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/i40e/i40e_adminq.c

@@ -889,6 +889,10 @@ i40e_status i40e_asq_send_command(struct i40e_hw *hw,
 		   "AQTX: desc and buffer writeback:\n");
 	i40e_debug_aq(hw, I40E_DEBUG_AQ_COMMAND, (void *)desc, buff, buff_size);
 
+	/* save writeback aq if requested */
+	if (details->wb_desc)
+		*details->wb_desc = *desc_on_ring;
+
 	/* update the error if time out occurred */
 	if ((!cmd_completed) &&
 	    (!details->async && !details->postpone)) {

drivers/net/ethernet/intel/i40e/i40e_adminq.h

@@ -69,6 +69,7 @@ struct i40e_asq_cmd_details {
 	u16 flags_dis;
 	bool async;
 	bool postpone;
+	struct i40e_aq_desc *wb_desc;
 };
 
 #define I40E_ADMINQ_DETAILS(R, i)   \

drivers/net/ethernet/intel/i40evf/i40e_adminq.c

@@ -830,6 +830,10 @@ i40e_status i40evf_asq_send_command(struct i40e_hw *hw,
 	i40evf_debug_aq(hw, I40E_DEBUG_AQ_COMMAND, (void *)desc, buff,
 			buff_size);
 
+	/* save writeback aq if requested */
+	if (details->wb_desc)
+		*details->wb_desc = *desc_on_ring;
+
 	/* update the error if time out occurred */
 	if ((!cmd_completed) &&
 	    (!details->async && !details->postpone)) {

drivers/net/ethernet/intel/i40evf/i40e_adminq.h

@@ -69,6 +69,7 @@ struct i40e_asq_cmd_details {
 	u16 flags_dis;
 	bool async;
 	bool postpone;
+	struct i40e_aq_desc *wb_desc;
 };
 
 #define I40E_ADMINQ_DETAILS(R, i)   \