MT762x HW supports frame length up to 2048 (maximum length on GDM),
so allow setting MTU up to 2030.
Signed-off-by: DENG Qingfang <dqf...@gmail.com>
---
I only tested this on MT7621, no sure if it is applicable for other SoCs
especially MT7628, which has an old IP.
---
drivers/net/ethernet/mediatek/mtk_eth_soc.c | 31 ++++++++++++++++++++-
drivers/net/ethernet/mediatek/mtk_eth_soc.h | 11 ++++++--
2 files changed, 38 insertions(+), 4 deletions(-)
diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
index 6d2d60675ffd..a0c56d9be1d5 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -353,7 +353,7 @@ static void mtk_mac_config(struct phylink_config *config,
unsigned int mode,
/* Setup gmac */
mcr_cur = mtk_r32(mac->hw, MTK_MAC_MCR(mac->id));
mcr_new = mcr_cur;
- mcr_new |= MAC_MCR_MAX_RX_1536 | MAC_MCR_IPG_CFG | MAC_MCR_FORCE_MODE |
+ mcr_new |= MAC_MCR_IPG_CFG | MAC_MCR_FORCE_MODE |
MAC_MCR_BACKOFF_EN | MAC_MCR_BACKPR_EN | MAC_MCR_FORCE_LINK;
/* Only update control register when needed! */
@@ -2499,6 +2499,34 @@ static void mtk_uninit(struct net_device *dev)
mtk_rx_irq_disable(eth, ~0);
}
+static int mtk_change_mtu(struct net_device *dev, int new_mtu)
+{
+ struct mtk_mac *mac = netdev_priv(dev);
+ u32 mcr_cur, mcr_new;
+ int length;
+
+ mcr_cur = mtk_r32(mac->hw, MTK_MAC_MCR(mac->id));
+ mcr_new = mcr_cur & ~MAC_MCR_MAX_RX_LEN_MASK;
+ length = new_mtu + MTK_RX_ETH_HLEN;
+
+ if (length <= 1518)
+ mcr_new |= MAC_MCR_MAX_RX_LEN(MAC_MCR_MAX_RX_LEN_1518);
+ else if (length <= 1536)
+ mcr_new |= MAC_MCR_MAX_RX_LEN(MAC_MCR_MAX_RX_LEN_1536);
+ else if (length <= 1552)
+ mcr_new |= MAC_MCR_MAX_RX_LEN(MAC_MCR_MAX_RX_LEN_1552);
+ else
+ mcr_new |= MAC_MCR_MAX_RX_LEN(MAC_MCR_MAX_RX_LEN_2048);
+
+ /* Only update control register when needed! */
+ if (mcr_new != mcr_cur)
+ mtk_w32(mac->hw, mcr_new, MTK_MAC_MCR(mac->id));
+
+ dev->mtu = new_mtu;
+
+ return 0;
+}
+
static int mtk_do_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
{
struct mtk_mac *mac = netdev_priv(dev);
@@ -2795,6 +2823,7 @@ static const struct net_device_ops mtk_netdev_ops = {
.ndo_set_mac_address = mtk_set_mac_address,
.ndo_validate_addr = eth_validate_addr,
.ndo_do_ioctl = mtk_do_ioctl,
+ .ndo_change_mtu = mtk_change_mtu,
.ndo_tx_timeout = mtk_tx_timeout,
.ndo_get_stats64 = mtk_get_stats64,
.ndo_fix_features = mtk_fix_features,
diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.h
b/drivers/net/ethernet/mediatek/mtk_eth_soc.h
index 454cfcd465fd..cfc11654ccd6 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.h
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.h
@@ -17,12 +17,12 @@
#include <linux/phylink.h>
#define MTK_QDMA_PAGE_SIZE 2048
-#define MTK_MAX_RX_LENGTH 1536
+#define MTK_MAX_RX_LENGTH 2048
#define MTK_TX_DMA_BUF_LEN 0x3fff
#define MTK_DMA_SIZE 256
#define MTK_NAPI_WEIGHT 64
#define MTK_MAC_COUNT 2
-#define MTK_RX_ETH_HLEN (VLAN_ETH_HLEN + VLAN_HLEN +
ETH_FCS_LEN)
+#define MTK_RX_ETH_HLEN (ETH_HLEN + ETH_FCS_LEN)
#define MTK_RX_HLEN (NET_SKB_PAD + MTK_RX_ETH_HLEN + NET_IP_ALIGN)
#define MTK_DMA_DUMMY_DESC 0xffffffff
#define MTK_DEFAULT_MSG_ENABLE (NETIF_MSG_DRV | \
@@ -320,7 +320,12 @@
/* Mac control registers */
#define MTK_MAC_MCR(x) (0x10100 + (x * 0x100))
-#define MAC_MCR_MAX_RX_1536 BIT(24)
+#define MAC_MCR_MAX_RX_LEN_MASK GENMASK(25, 24)
+#define MAC_MCR_MAX_RX_LEN(_x) (MAC_MCR_MAX_RX_LEN_MASK & ((_x) << 24))
+#define MAC_MCR_MAX_RX_LEN_1518 0x0
+#define MAC_MCR_MAX_RX_LEN_1536 0x1
+#define MAC_MCR_MAX_RX_LEN_1552 0x2
+#define MAC_MCR_MAX_RX_LEN_2048 0x3
#define MAC_MCR_IPG_CFG (BIT(18) | BIT(16))
#define MAC_MCR_FORCE_MODE BIT(15)
#define MAC_MCR_TX_EN BIT(14)
--
2.25.1
