net: libwx: Support to receive packets in NAPI

Clean all queues associated with a q_vector, to simple receive packets
without hardware features.
Signed-off-by: Jiawen Wu <jiawenwu@trustnetic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/wangxun/libwx/wx_hw.c

@@ -8,6 +8,7 @@
 #include <linux/pci.h>
 
 #include "wx_type.h"
+#include "wx_lib.h"
 #include "wx_hw.h"
 
 static void wx_intr_disable(struct wx *wx, u64 qmask)
@@ -1368,6 +1369,7 @@ static void wx_configure_rx_ring(struct wx *wx,
 				 struct wx_ring *ring)
 {
 	u16 reg_idx = ring->reg_idx;
+	union wx_rx_desc *rx_desc;
 	u64 rdba = ring->dma;
 	u32 rxdctl;
 
@@ -1393,11 +1395,20 @@ static void wx_configure_rx_ring(struct wx *wx,
 
 	wx_configure_srrctl(wx, ring);
 
+	/* initialize rx_buffer_info */
+	memset(ring->rx_buffer_info, 0,
+	       sizeof(struct wx_rx_buffer) * ring->count);
+
+	/* initialize Rx descriptor 0 */
+	rx_desc = WX_RX_DESC(ring, 0);
+	rx_desc->wb.upper.length = 0;
+
 	/* enable receive descriptor ring */
 	wr32m(wx, WX_PX_RR_CFG(reg_idx),
 	      WX_PX_RR_CFG_RR_EN, WX_PX_RR_CFG_RR_EN);
 
 	wx_enable_rx_queue(wx, ring);
+	wx_alloc_rx_buffers(ring, wx_desc_unused(ring));
 }
 
 /**

drivers/net/ethernet/wangxun/libwx/wx_lib.h

@@ -7,6 +7,10 @@
 #ifndef _WX_LIB_H_
 #define _WX_LIB_H_
 
+void wx_alloc_rx_buffers(struct wx_ring *rx_ring, u16 cleaned_count);
+u16 wx_desc_unused(struct wx_ring *ring);
+void wx_napi_enable_all(struct wx *wx);
+void wx_napi_disable_all(struct wx *wx);
 void wx_reset_interrupt_capability(struct wx *wx);
 void wx_clear_interrupt_scheme(struct wx *wx);
 int wx_init_interrupt_scheme(struct wx *wx);
@@ -16,7 +20,10 @@ int wx_setup_isb_resources(struct wx *wx);
 void wx_free_isb_resources(struct wx *wx);
 u32 wx_misc_isb(struct wx *wx, enum wx_isb_idx idx);
 void wx_configure_vectors(struct wx *wx);
+void wx_clean_all_rx_rings(struct wx *wx);
 void wx_free_resources(struct wx *wx);
 int wx_setup_resources(struct wx *wx);
+void wx_get_stats64(struct net_device *netdev,
+		    struct rtnl_link_stats64 *stats);
 
 #endif /* _NGBE_LIB_H_ */

drivers/net/ethernet/wangxun/libwx/wx_type.h

@@ -311,8 +311,15 @@
 #define WX_RX_BUFSZ      WX_RXBUFFER_2K
 #endif
 
+#define WX_RX_BUFFER_WRITE   16      /* Must be power of 2 */
 #define WX_CFG_PORT_ST               0x14404
 
+/******************* Receive Descriptor bit definitions **********************/
+#define WX_RXD_STAT_DD               BIT(0) /* Done */
+#define WX_RXD_STAT_EOP              BIT(1) /* End of Packet */
+
+#define WX_RXD_ERR_RXE               BIT(29) /* Any MAC Error */
+
 /* Host Interface Command Structures */
 struct wx_hic_hdr {
 	u8 cmd;
@@ -433,6 +440,15 @@ enum wx_reset_type {
 	WX_GLOBAL_RESET
 };
 
+struct wx_cb {
+	dma_addr_t dma;
+	u16     append_cnt;      /* number of skb's appended */
+	bool    page_released;
+	bool    dma_released;
+};
+
+#define WX_CB(skb) ((struct wx_cb *)(skb)->cb)
+
 /* Transmit Descriptor */
 union wx_tx_desc {
 	struct {
@@ -478,6 +494,9 @@ union wx_rx_desc {
 	} wb;  /* writeback */
 };
 
+#define WX_RX_DESC(R, i)     \
+	(&(((union wx_rx_desc *)((R)->desc))[i]))
+
 /* wrapper around a pointer to a socket buffer,
  * so a DMA handle can be stored along with the buffer
  */
@@ -496,6 +515,12 @@ struct wx_rx_buffer {
 	dma_addr_t page_dma;
 	struct page *page;
 	unsigned int page_offset;
+	u16 pagecnt_bias;
+};
+
+struct wx_queue_stats {
+	u64 packets;
+	u64 bytes;
 };
 
 /* iterator for handling rings in ring container */
@@ -504,6 +529,8 @@ struct wx_rx_buffer {
 
 struct wx_ring_container {
 	struct wx_ring *ring;           /* pointer to linked list of rings */
+	unsigned int total_bytes;       /* total bytes processed this int */
+	unsigned int total_packets;     /* total packets processed this int */
 	u8 count;                       /* total number of rings in vector */
 	u8 itr;                         /* current ITR setting for ring */
 };
@@ -531,6 +558,12 @@ struct wx_ring {
 					 * associated with this ring, which is
 					 * different for DCB and RSS modes
 					 */
+	u16 next_to_use;
+	u16 next_to_clean;
+	u16 next_to_alloc;
+
+	struct wx_queue_stats stats;
+	struct u64_stats_sync syncp;
 } ____cacheline_internodealigned_in_smp;
 
 struct wx_q_vector {
@@ -632,6 +665,7 @@ struct wx {
 };
 
 #define WX_INTR_ALL (~0ULL)
+#define WX_INTR_Q(i) BIT(i)
 
 /* register operations */
 #define wr32(a, reg, value)	writel((value), ((a)->hw_addr + (reg)))