Merge branch 'macb-napi-improvements'

Robert Hancock says:

====================
MACB NAPI improvements

Simplify the logic in the Cadence MACB/GEM driver for determining
when to reschedule NAPI processing, and update it to use NAPI for the
TX path as well as the RX path.

Changes since v1: Changed to use separate TX and RX NAPI instances and
poll functions to avoid unnecessary checks of the other ring (TX/RX)
states during polling and to use budget handling for both RX and TX.
Fixed locking to protect against concurrent access to TX ring on
TX transmit and TX poll paths.
====================

Link: https://lore.kernel.org/r/20220509194635.3094080-1-robert.hancock@calian.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/cadence/macb.h

@@ -1204,11 +1204,15 @@ struct macb_queue {
 	unsigned int		RBQP;
 	unsigned int		RBQPH;
 
+	/* Lock to protect tx_head and tx_tail */
+	spinlock_t		tx_ptr_lock;
 	unsigned int		tx_head, tx_tail;
 	struct macb_dma_desc	*tx_ring;
 	struct macb_tx_skb	*tx_skb;
 	dma_addr_t		tx_ring_dma;
 	struct work_struct	tx_error_task;
+	bool			txubr_pending;
+	struct napi_struct	napi_tx;
 
 	dma_addr_t		rx_ring_dma;
 	dma_addr_t		rx_buffers_dma;
@@ -1217,7 +1221,7 @@ struct macb_queue {
 	struct macb_dma_desc	*rx_ring;
 	struct sk_buff		**rx_skbuff;
 	void			*rx_buffers;
-	struct napi_struct	napi;
+	struct napi_struct	napi_rx;
 	struct queue_stats stats;
 
 #ifdef CONFIG_MACB_USE_HWSTAMP