sfc: eliminate xdp_rxq_info_valid using XDP base API

Commit eb9a36be7f ("sfc: perform XDP processing on received packets")
use xdp_rxq_info_valid to track failures of xdp_rxq_info_reg().
However, this driver-maintained state becomes redundant since the XDP
framework already provides xdp_rxq_info_is_reg() for checking registration
status.

Signed-off-by: Fushuai Wang <wangfushuai@baidu.com>
Acked-by: Edward Cree <ecree.xilinx@gmail.com>
Reviewed-by: Larysa Zaremba <larysa.zaremba@intel.com>
Link: https://patch.msgid.link/20250628051016.51022-1-wangfushuai@baidu.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/sfc/net_driver.h

@@ -404,7 +404,6 @@ struct efx_rx_page_state {
  * @old_rx_packets: Value of @rx_packets as of last efx_init_rx_queue()
  * @old_rx_bytes: Value of @rx_bytes as of last efx_init_rx_queue()
  * @xdp_rxq_info: XDP specific RX queue information.
- * @xdp_rxq_info_valid: Is xdp_rxq_info valid data?.
  */
 struct efx_rx_queue {
 	struct efx_nic *efx;
@@ -443,7 +442,6 @@ struct efx_rx_queue {
 	unsigned long old_rx_packets;
 	unsigned long old_rx_bytes;
 	struct xdp_rxq_info xdp_rxq_info;
-	bool xdp_rxq_info_valid;
 };
 
 enum efx_sync_events_state {

drivers/net/ethernet/sfc/rx_common.c

@@ -269,8 +269,6 @@ void efx_init_rx_queue(struct efx_rx_queue *rx_queue)
 			  "Failure to initialise XDP queue information rc=%d\n",
 			  rc);
 		efx->xdp_rxq_info_failed = true;
-	} else {
-		rx_queue->xdp_rxq_info_valid = true;
 	}
 
 	/* Set up RX descriptor ring */
@@ -302,10 +300,8 @@ void efx_fini_rx_queue(struct efx_rx_queue *rx_queue)
 
 	efx_fini_rx_recycle_ring(rx_queue);
 
-	if (rx_queue->xdp_rxq_info_valid)
+	if (xdp_rxq_info_is_reg(&rx_queue->xdp_rxq_info))
 		xdp_rxq_info_unreg(&rx_queue->xdp_rxq_info);
-
-	rx_queue->xdp_rxq_info_valid = false;
 }
 
 void efx_remove_rx_queue(struct efx_rx_queue *rx_queue)