rtl838x: Enable jumbo frames by default

Increase DEFAULT_MTU and max-mtu size
Increase truncate length on rx of jumbo frame

Acked-by: Simon Wunderlich <sw@simonwunderlich.de>
Signed-off-by: Harshal Gohel <hg@simonwunderlich.de>

diff --git a/target/linux/realtek/files-5.15/drivers/net/ethernet/rtl838x_eth.c b/target/linux/realtek/files-5.15/drivers/net/ethernet/rtl838x_eth.c
index 9dcb7a3b78ed7c5d66d5abde76ea0ea4b15413bb..54e592aeaafa592037c30b6a2d701642df196002 100644 (file)
--- a/target/linux/realtek/files-5.15/drivers/net/ethernet/rtl838x_eth.c
+++ b/target/linux/realtek/files-5.15/drivers/net/ethernet/rtl838x_eth.c
@@ -43,6 +43,9 @@ extern struct rtl83xx_soc_info soc_info;
 #define RX_EN          0x4
 #define TX_EN_93XX     0x20
 #define RX_EN_93XX     0x10
+#define RX_TRUNCATE_EN_93XX BIT(6)
+#define RX_TRUNCATE_EN_83XX BIT(4)
+#define TX_PAD_EN_838X BIT(5)
 #define TX_DO          0x2
 #define WRAP           0x2
 #define MAX_PORTS      57
@@ -727,8 +730,8 @@ static void rtl838x_hw_en_rxtx(struct rtl838x_eth_priv *priv)
        /* Disable Head of Line features for all RX rings */
        sw_w32(0xffffffff, priv->r->dma_if_rx_ring_size(0));
 
-       /* Truncate RX buffer to 0x640 (1600) bytes, pad TX */
-       sw_w32(0x06400020, priv->r->dma_if_ctrl);
+       /* Truncate RX buffer to DEFAULT_MTU bytes, pad TX */
+       sw_w32((DEFAULT_MTU << 16) | RX_TRUNCATE_EN_83XX | TX_PAD_EN_838X, priv->r->dma_if_ctrl);
 
        /* Enable RX done, RX overflow and TX done interrupts */
        sw_w32(0xfffff, priv->r->dma_if_intr_msk);
@@ -752,7 +755,7 @@ static void rtl838x_hw_en_rxtx(struct rtl838x_eth_priv *priv)
 static void rtl839x_hw_en_rxtx(struct rtl838x_eth_priv *priv)
 {
        /* Setup CPU-Port: RX Buffer */
-       sw_w32(0x0000c808, priv->r->dma_if_ctrl);
+       sw_w32((DEFAULT_MTU << 5) | RX_TRUNCATE_EN_83XX, priv->r->dma_if_ctrl);
 
        /* Enable Notify, RX done, RX overflow and TX done interrupts */
        sw_w32(0x007fffff, priv->r->dma_if_intr_msk); /* Notify IRQ! */
@@ -775,8 +778,8 @@ static void rtl839x_hw_en_rxtx(struct rtl838x_eth_priv *priv)
 
 static void rtl93xx_hw_en_rxtx(struct rtl838x_eth_priv *priv)
 {
-       /* Setup CPU-Port: RX Buffer truncated at 1600 Bytes */
-       sw_w32(0x06400040, priv->r->dma_if_ctrl);
+       /* Setup CPU-Port: RX Buffer truncated at DEFAULT_MTU Bytes */
+       sw_w32((DEFAULT_MTU << 16) | RX_TRUNCATE_EN_93XX, priv->r->dma_if_ctrl);
 
        for (int i = 0; i < priv->rxrings; i++) {
                int pos = (i % 3) * 10;
@@ -2415,7 +2418,7 @@ static int __init rtl838x_eth_probe(struct platform_device *pdev)
 
        dev->ethtool_ops = &rtl838x_ethtool_ops;
        dev->min_mtu = ETH_ZLEN;
-       dev->max_mtu = 1536;
+       dev->max_mtu = DEFAULT_MTU;
        dev->features = NETIF_F_RXCSUM | NETIF_F_HW_CSUM;
        dev->hw_features = NETIF_F_RXCSUM;
 

diff --git a/target/linux/realtek/files-5.15/drivers/net/ethernet/rtl838x_eth.h b/target/linux/realtek/files-5.15/drivers/net/ethernet/rtl838x_eth.h
index 7a5ff678a4cde3ddcb583959834a9a1b919e5478..47ed286aa44731746bd922010850002d6a6bb024 100644 (file)
--- a/target/linux/realtek/files-5.15/drivers/net/ethernet/rtl838x_eth.h
+++ b/target/linux/realtek/files-5.15/drivers/net/ethernet/rtl838x_eth.h
@@ -216,6 +216,9 @@
 /* Registers of the internal Serdes of the 8380 */
 #define RTL838X_SDS4_FIB_REG0                  (0xF800)
 
+/* Default MTU with jumbo frames support */
+#define DEFAULT_MTU 9000
+
 inline int rtl838x_mac_port_ctrl(int p)
 {
        return RTL838X_MAC_PORT_CTRL + (p << 7);