Merge branch 'macb-next'

Cyrille Pitchen says:

====================
net/macb: add HW features to macb driver

this series of patches adds new hardware features to macb driver. These
features can be enabled/disabled at runtime using ethtool. Depending on
hardware and design configuration, some are enabled by default whereas other
are disabled.

For instance, checksum offload features are enabled by default for gem designed
for packet buffer mode but disabled for fifo mode design or for old macb.

Besides, the scatter-gather feature is enabled and tested on macb but disabled
on sama5d3x gem. When testing this feature on sama5d3x gem, TX lockups occured
frequently.

Also, the RX checksum offload feature is enabled at GEM level only when both
IFF_PROMISC bit is clear in dev->flags and NETIF_F_RXCSUM bit is set in
dev->features.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

arch/arm/boot/dts/sama5d3_gmac.dtsi

@@ -74,7 +74,7 @@ macb0_clk: macb0_clk {
 			};
 
 			macb0: ethernet@f0028000 {
-				compatible = "cdns,pc302-gem", "cdns,gem";
+				compatible = "atmel,sama5d3-gem";
 				reg = <0xf0028000 0x100>;
 				interrupts = <34 IRQ_TYPE_LEVEL_HIGH 3>;
 				pinctrl-names = "default";

drivers/net/ethernet/cadence/macb.h

@@ -164,6 +164,8 @@
 #define GEM_CLK_SIZE				3
 #define GEM_DBW_OFFSET				21
 #define GEM_DBW_SIZE				2
+#define GEM_RXCOEN_OFFSET			24
+#define GEM_RXCOEN_SIZE				1
 
 /* Constants for data bus width. */
 #define GEM_DBW32				0
@@ -305,6 +307,12 @@
 #define GEM_DBWDEF_OFFSET			25
 #define GEM_DBWDEF_SIZE				3
 
+/* Bitfields in DCFG2. */
+#define GEM_RX_PKT_BUFF_OFFSET			20
+#define GEM_RX_PKT_BUFF_SIZE			1
+#define GEM_TX_PKT_BUFF_OFFSET			21
+#define GEM_TX_PKT_BUFF_SIZE			1
+
 /* Constants for CLK */
 #define MACB_CLK_DIV8				0
 #define MACB_CLK_DIV16				1
@@ -326,7 +334,11 @@
 #define MACB_MAN_CODE				2
 
 /* Capability mask bits */
-#define MACB_CAPS_ISR_CLEAR_ON_WRITE		0x1
+#define MACB_CAPS_ISR_CLEAR_ON_WRITE		0x00000001
+#define MACB_CAPS_FIFO_MODE			0x10000000
+#define MACB_CAPS_GIGABIT_MODE_AVAILABLE	0x20000000
+#define MACB_CAPS_SG_DISABLED			0x40000000
+#define MACB_CAPS_MACB_IS_GEM			0x80000000
 
 /* Bit manipulation macros */
 #define MACB_BIT(name)					\
@@ -442,6 +454,14 @@ struct macb_dma_desc {
 #define MACB_RX_BROADCAST_OFFSET		31
 #define MACB_RX_BROADCAST_SIZE			1
 
+/* RX checksum offload disabled: bit 24 clear in NCFGR */
+#define GEM_RX_TYPEID_MATCH_OFFSET		22
+#define GEM_RX_TYPEID_MATCH_SIZE		2
+
+/* RX checksum offload enabled: bit 24 set in NCFGR */
+#define GEM_RX_CSUM_OFFSET			22
+#define GEM_RX_CSUM_SIZE			2
+
 #define MACB_TX_FRMLEN_OFFSET			0
 #define MACB_TX_FRMLEN_SIZE			11
 #define MACB_TX_LAST_OFFSET			15
@@ -459,14 +479,32 @@ struct macb_dma_desc {
 #define MACB_TX_USED_OFFSET			31
 #define MACB_TX_USED_SIZE			1
 
+#define GEM_TX_FRMLEN_OFFSET			0
+#define GEM_TX_FRMLEN_SIZE			14
+
+/* Buffer descriptor constants */
+#define GEM_RX_CSUM_NONE			0
+#define GEM_RX_CSUM_IP_ONLY			1
+#define GEM_RX_CSUM_IP_TCP			2
+#define GEM_RX_CSUM_IP_UDP			3
+
+/* limit RX checksum offload to TCP and UDP packets */
+#define GEM_RX_CSUM_CHECKED_MASK		2
+
 /**
  * struct macb_tx_skb - data about an skb which is being transmitted
- * @skb: skb currently being transmitted
- * @mapping: DMA address of the skb's data buffer
+ * @skb: skb currently being transmitted, only set for the last buffer
+ *       of the frame
+ * @mapping: DMA address of the skb's fragment buffer
+ * @size: size of the DMA mapped buffer
+ * @mapped_as_page: true when buffer was mapped with skb_frag_dma_map(),
+ *                  false when buffer was mapped with dma_map_single()
  */
 struct macb_tx_skb {
 	struct sk_buff		*skb;
 	dma_addr_t		mapping;
+	size_t			size;
+	bool			mapped_as_page;
 };
 
 /*
@@ -554,6 +592,11 @@ struct macb_or_gem_ops {
 	int	(*mog_rx)(struct macb *bp, int budget);
 };
 
+struct macb_config {
+	u32			caps;
+	unsigned int		dma_burst_length;
+};
+
 struct macb {
 	void __iomem		*regs;
 
@@ -595,6 +638,7 @@ struct macb {
 	unsigned int 		duplex;
 
 	u32			caps;
+	unsigned int		dma_burst_length;
 
 	phy_interface_t		phy_interface;
 
@@ -602,6 +646,7 @@ struct macb {
 	struct sk_buff *skb;			/* holds skb until xmit interrupt completes */
 	dma_addr_t skb_physaddr;		/* phys addr from pci_map_single */
 	int skb_length;				/* saved skb length for pci_unmap_single */
+	unsigned int		max_tx_length;
 };
 
 extern const struct ethtool_ops macb_ethtool_ops;
@@ -615,7 +660,7 @@ void macb_get_hwaddr(struct macb *bp);
 
 static inline bool macb_is_gem(struct macb *bp)
 {
-	return MACB_BFEXT(IDNUM, macb_readl(bp, MID)) == 0x2;
+	return !!(bp->caps & MACB_CAPS_MACB_IS_GEM);
 }
 
 #endif /* _MACB_H */