Merge pull request #12057 from OpenNuvoton/nuvoton_emac_max_recv

NUC472/M487: Limit EMAC receive frame length as 1518

Author: 0xc0170

features/netsocket/emac-drivers/TARGET_NUVOTON_EMAC/TARGET_M480/m480_eth.c

@@ -262,6 +262,8 @@ void numaker_eth_init(uint8_t *mac_addr)
                     EMAC_CAMCTL_ABP_Msk;
     EMAC->CAMEN = 1;    // Enable CAM entry 0    
 
+    /* Limit the max receive frame length to 1514 + 4 */
+    EMAC->MRFL = NU_ETH_MAX_FLEN;    
     reset_phy();                    
 
     EMAC_ENABLE_RX();

features/netsocket/emac-drivers/TARGET_NUVOTON_EMAC/TARGET_M480/m480_eth.h

@@ -85,7 +85,7 @@
 #define RX_DESCRIPTOR_NUM       NU_RX_RING_LEN//4 //2    // 4: Max Number of Rx Frame Descriptors
 #define TX_DESCRIPTOR_NUM       NU_TX_RING_LEN//4 //2    // 4: Max number of Tx Frame Descriptors
 
-#define PACKET_BUFFER_SIZE      NU_ETH_MAX_FLEN//1520
+#define PACKET_BUFFER_SIZE      ( NU_ETH_MAX_FLEN + ((NU_ETH_MAX_FLEN%4) ? (4 - (NU_ETH_MAX_FLEN%4)) : 0) ) //For DMA 4 bytes alignment
 
 #define CONFIG_PHY_ADDR     1
 

features/netsocket/emac-drivers/TARGET_NUVOTON_EMAC/TARGET_NUC472/nuc472_eth.c

@@ -228,6 +228,9 @@ void numaker_eth_init(uint8_t *mac_addr)
     init_rx_desc();
 
     numaker_set_mac_addr(mac_addr);  // need to reconfigure hardware address 'cos we just RESET emc...
+
+    /* Limit the max receive frame length to 1514 + 4 */
+    EMAC->MRFL = NU_ETH_MAX_FLEN;
     reset_phy();
 
     EMAC->CTL |= EMAC_CTL_STRIPCRC_Msk | EMAC_CTL_RXON_Msk | EMAC_CTL_TXON_Msk | EMAC_CTL_RMIIEN_Msk | EMAC_CTL_RMIIRXCTL_Msk;

features/netsocket/emac-drivers/TARGET_NUVOTON_EMAC/TARGET_NUC472/nuc472_eth.h

@@ -84,7 +84,7 @@
 #define RX_DESCRIPTOR_NUM       NU_RX_RING_LEN//4 //2    // 4: Max Number of Rx Frame Descriptors
 #define TX_DESCRIPTOR_NUM       NU_TX_RING_LEN//4 //2    // 4: Max number of Tx Frame Descriptors
 
-#define PACKET_BUFFER_SIZE      NU_ETH_MAX_FLEN//1520
+#define PACKET_BUFFER_SIZE      ( NU_ETH_MAX_FLEN + ((NU_ETH_MAX_FLEN%4) ? (4 - (NU_ETH_MAX_FLEN%4)) : 0) ) //For DMA 4 bytes alignment
 
 #define CONFIG_PHY_ADDR     1
 

features/netsocket/emac-drivers/TARGET_NUVOTON_EMAC/numaker_emac.cpp

@@ -42,7 +42,7 @@
 #define NU_BUFF_ALIGNMENT       4
 #define PHY_LINKED_STATE        1
 #define PHY_UNLINKED_STATE      0
-#define PACKET_BUFFER_SIZE      NU_ETH_MAX_FLEN
+#define PACKET_BUFFER_SIZE      ( NU_ETH_MAX_FLEN + ((NU_ETH_MAX_FLEN%4) ? (4 - (NU_ETH_MAX_FLEN%4)) : 0) ) //For DMA 4 bytes alignment
 
 extern "C" void numaker_eth_rx_next(void);
 /* \brief Flags for worker thread */

features/netsocket/emac-drivers/TARGET_NUVOTON_EMAC/numaker_emac_config.h

@@ -22,7 +22,7 @@
 #define NU_RX_RING_LEN              (8)
 #define NU_TX_RING_LEN              (4)
 
-#define NU_ETH_MAX_FLEN             (1520) 
+#define NU_ETH_MAX_FLEN             (1518) 
 
 #define NU_HWADDR_SIZE              (6)