idpf: set the payload size before calling the async handler

Set the payload size before forwarding the reply to the async handler.
Without this, xn->reply_sz will be 0 and idpf_mac_filter_async_handler()
will never get past the size check.

Fixes: 34c21fa ("idpf: implement virtchnl transaction manager")
Cc: stable@vger.kernel.org
Signed-off-by: Emil Tantilov <emil.s.tantilov@intel.com>
Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com>
Reviewed-by: Li Li <boolli@google.com>
Acked-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Tested-by: Samuel Salin <Samuel.salin@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

Author: etantilov

drivers/net/ethernet/intel/idpf/idpf_virtchnl.c

@@ -615,6 +615,10 @@ idpf_vc_xn_forward_reply(struct idpf_adapter *adapter,
 		err = -ENXIO;
 		goto out_unlock;
 	case IDPF_VC_XN_ASYNC:
+		/* Set reply_sz from the actual payload so that async_handler
+		 * can evaluate the response.
+		 */
+		xn->reply_sz = ctlq_msg->data_len;
 		err = idpf_vc_xn_forward_async(adapter, xn, ctlq_msg);
 		idpf_vc_xn_unlock(xn);
 		return err;