Merge branch 'net-renesas-rswitch-improve-tx-timestamp-accuracy'

Yoshihiro Shimoda says:

====================
net: renesas: rswitch: Improve TX timestamp accuracy

The patch [[123]/4] are minor refacoring for readability.
The patch [4/4] is for improving TX timestamp accuracy.
To improve the accuracy, it requires refactoring so that this is not
a fixed patch.

v2: https://lore.kernel.org/all/20230208235721.2336249-1-yoshihiro.shimoda.uh@renesas.com/
v1: https://lore.kernel.org/all/20230208073445.2317192-1-yoshihiro.shimoda.uh@renesas.com/
====================

Link: https://lore.kernel.org/r/20230209081741.2536034-1-yoshihiro.shimoda.uh@renesas.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/renesas/rswitch.h

@@ -27,6 +27,7 @@
 
 #define TX_RING_SIZE		1024
 #define RX_RING_SIZE		1024
+#define TS_RING_SIZE		(TX_RING_SIZE * RSWITCH_NUM_PORTS)
 
 #define PKT_BUF_SZ		1584
 #define RSWITCH_ALIGN		128
@@ -49,6 +50,10 @@
 #define AGENT_INDEX_GWCA	3
 #define GWRO			RSWITCH_GWCA0_OFFSET
 
+#define GWCA_TS_IRQ_RESOURCE_NAME	"gwca0_rxts0"
+#define GWCA_TS_IRQ_NAME		"rswitch: gwca0_rxts0"
+#define GWCA_TS_IRQ_BIT			BIT(0)
+
 #define FWRO	0
 #define TPRO	RSWITCH_TOP_OFFSET
 #define CARO	RSWITCH_COMA_OFFSET
@@ -831,7 +836,7 @@ enum DIE_DT {
 	DT_FSINGLE	= 0x80,
 	DT_FSTART	= 0x90,
 	DT_FMID		= 0xa0,
-	DT_FEND		= 0xb8,
+	DT_FEND		= 0xb0,
 
 	/* Chain control */
 	DT_LEMPTY	= 0xc0,
@@ -843,7 +848,7 @@ enum DIE_DT {
 	DT_FEMPTY	= 0x40,
 	DT_FEMPTY_IS	= 0x10,
 	DT_FEMPTY_IC	= 0x20,
-	DT_FEMPTY_ND	= 0x38,
+	DT_FEMPTY_ND	= 0x30,
 	DT_FEMPTY_START	= 0x50,
 	DT_FEMPTY_MID	= 0x60,
 	DT_FEMPTY_END	= 0x70,
@@ -865,6 +870,12 @@ enum DIE_DT {
 /* For reception */
 #define INFO1_SPN(port)		((u64)(port) << 36ULL)
 
+/* For timestamp descriptor in dptrl (Byte 4 to 7) */
+#define TS_DESC_TSUN(dptrl)	((dptrl) & GENMASK(7, 0))
+#define TS_DESC_SPN(dptrl)	(((dptrl) & GENMASK(10, 8)) >> 8)
+#define TS_DESC_DPN(dptrl)	(((dptrl) & GENMASK(17, 16)) >> 16)
+#define TS_DESC_TN(dptrl)	((dptrl) & BIT(24))
+
 struct rswitch_desc {
 	__le16 info_ds;	/* Descriptor size */
 	u8 die_dt;	/* Descriptor interrupt enable and type */
@@ -911,27 +922,43 @@ struct rswitch_etha {
  * name, this driver calls "queue".
  */
 struct rswitch_gwca_queue {
-	int index;
-	bool dir_tx;
-	bool gptp;
 	union {
-		struct rswitch_ext_desc *ring;
-		struct rswitch_ext_ts_desc *ts_ring;
+		struct rswitch_ext_desc *tx_ring;
+		struct rswitch_ext_ts_desc *rx_ring;
+		struct rswitch_ts_desc *ts_ring;
 	};
+
+	/* Common */
 	dma_addr_t ring_dma;
 	int ring_size;
 	int cur;
 	int dirty;
-	struct sk_buff **skbs;
 
+	/* For [rt]_ring */
+	int index;
+	bool dir_tx;
+	struct sk_buff **skbs;
 	struct net_device *ndev;	/* queue to ndev for irq */
 };
 
+struct rswitch_gwca_ts_info {
+	struct sk_buff *skb;
+	struct list_head list;
+
+	int port;
+	u8 tag;
+};
+
 #define RSWITCH_NUM_IRQ_REGS	(RSWITCH_MAX_NUM_QUEUES / BITS_PER_TYPE(u32))
 struct rswitch_gwca {
 	int index;
+	struct rswitch_desc *linkfix_table;
+	dma_addr_t linkfix_table_dma;
+	u32 linkfix_table_size;
 	struct rswitch_gwca_queue *queues;
 	int num_queues;
+	struct rswitch_gwca_queue ts_queue;
+	struct list_head ts_info_list;
 	DECLARE_BITMAP(used, RSWITCH_MAX_NUM_QUEUES);
 	u32 tx_irq_bits[RSWITCH_NUM_IRQ_REGS];
 	u32 rx_irq_bits[RSWITCH_NUM_IRQ_REGS];
@@ -969,9 +996,6 @@ struct rswitch_private {
 	struct platform_device *pdev;
 	void __iomem *addr;
 	struct rcar_gen4_ptp_private *ptp_priv;
-	struct rswitch_desc *linkfix_table;
-	dma_addr_t linkfix_table_dma;
-	u32 linkfix_table_size;
 
 	struct rswitch_device *rdev[RSWITCH_NUM_PORTS];