net: libwx: Add tx path to process packets

Support to transmit packets without hardware features.
Signed-off-by: Mengyuan Lou <mengyuanlou@net-swift.com>
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

@@ -1355,6 +1355,10 @@ static void wx_configure_tx_ring(struct wx *wx,
 		txdctl |= ring->count / 128 << WX_PX_TR_CFG_TR_SIZE_SHIFT;
 	txdctl |= 0x20 << WX_PX_TR_CFG_WTHRESH_SHIFT;
 
+	/* reinitialize tx_buffer_info */
+	memset(ring->tx_buffer_info, 0,
+	       sizeof(struct wx_tx_buffer) * ring->count);
+
 	/* enable queue */
 	wr32(wx, WX_PX_TR_CFG(reg_idx), txdctl);
 

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

@@ -9,6 +9,8 @@
 
 void wx_alloc_rx_buffers(struct wx_ring *rx_ring, u16 cleaned_count);
 u16 wx_desc_unused(struct wx_ring *ring);
+netdev_tx_t wx_xmit_frame(struct sk_buff *skb,
+			  struct net_device *netdev);
 void wx_napi_enable_all(struct wx *wx);
 void wx_napi_disable_all(struct wx *wx);
 void wx_reset_interrupt_capability(struct wx *wx);
@@ -21,6 +23,7 @@ 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_clean_all_tx_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,

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

@@ -312,6 +312,15 @@
 #endif
 
 #define WX_RX_BUFFER_WRITE   16      /* Must be power of 2 */
+
+#define WX_MAX_DATA_PER_TXD  BIT(14)
+/* Tx Descriptors needed, worst case */
+#define TXD_USE_COUNT(S)     DIV_ROUND_UP((S), WX_MAX_DATA_PER_TXD)
+#define DESC_NEEDED          (MAX_SKB_FRAGS + 4)
+
+/* Ether Types */
+#define WX_ETH_P_CNM                 0x22E7
+
 #define WX_CFG_PORT_ST               0x14404
 
 /******************* Receive Descriptor bit definitions **********************/
@@ -320,6 +329,14 @@
 
 #define WX_RXD_ERR_RXE               BIT(29) /* Any MAC Error */
 
+/*********************** Transmit Descriptor Config Masks ****************/
+#define WX_TXD_STAT_DD               BIT(0)  /* Descriptor Done */
+#define WX_TXD_DTYP_DATA             0       /* Adv Data Descriptor */
+#define WX_TXD_PAYLEN_SHIFT          13      /* Desc PAYLEN shift */
+#define WX_TXD_EOP                   BIT(24) /* End of Packet */
+#define WX_TXD_IFCS                  BIT(25) /* Insert FCS */
+#define WX_TXD_RS                    BIT(27) /* Report Status */
+
 /* Host Interface Command Structures */
 struct wx_hic_hdr {
 	u8 cmd;
@@ -496,6 +513,8 @@ union wx_rx_desc {
 
 #define WX_RX_DESC(R, i)     \
 	(&(((union wx_rx_desc *)((R)->desc))[i]))
+#define WX_TX_DESC(R, i)     \
+	(&(((union wx_tx_desc *)((R)->desc))[i]))
 
 /* wrapper around a pointer to a socket buffer,
  * so a DMA handle can be stored along with the buffer