From 3e753c45cd19199ef61aad805b0e29ed261577bd Mon Sep 17 00:00:00 2001 From: Harshal Gohel Date: Mon, 27 Nov 2023 17:08:04 +0100 Subject: [PATCH] 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 Signed-off-by: Harshal Gohel --- .../files-5.15/drivers/net/ethernet/rtl838x_eth.c | 15 +++++++++------ .../files-5.15/drivers/net/ethernet/rtl838x_eth.h | 3 +++ 2 files changed, 12 insertions(+), 6 deletions(-) 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 9dcb7a3b78..54e592aeaa 100644 --- 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 7a5ff678a4..47ed286aa4 100644 --- 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); -- 2.30.2