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From 4fd59792097a6b2fb949d41264386a7ecade469e Mon Sep 17 00:00:00 2001
From: DENG Qingfang <dqfext@gmail.com>
Date: Mon, 25 Jan 2021 12:20:46 +0800
Subject: [PATCH] net: ethernet: mediatek: support setting MTU
MT762x HW, except for MT7628, supports frame length up to 2048
(maximum length on GDM), so allow setting MTU up to 2030.
Also set the default frame length to the hardware default 1518.
Signed-off-by: DENG Qingfang <dqfext@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://lore.kernel.org/r/20210125042046.5599-1-dqfext@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
drivers/net/ethernet/mediatek/mtk_eth_soc.c | 43 ++++++++++++++++++---
drivers/net/ethernet/mediatek/mtk_eth_soc.h | 12 ++++--
2 files changed, 47 insertions(+), 8 deletions(-)
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -355,7 +355,7 @@ static void mtk_mac_config(struct phylin
/* 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 |
MAC_MCR_RX_FIFO_CLR_DIS;
@@ -783,8 +783,8 @@ static void mtk_get_stats64(struct net_d
static inline int mtk_max_frag_size(int mtu)
{
/* make sure buf_size will be at least MTK_MAX_RX_LENGTH */
- if (mtu + MTK_RX_ETH_HLEN < MTK_MAX_RX_LENGTH)
- mtu = MTK_MAX_RX_LENGTH - MTK_RX_ETH_HLEN;
+ if (mtu + MTK_RX_ETH_HLEN < MTK_MAX_RX_LENGTH_2K)
+ mtu = MTK_MAX_RX_LENGTH_2K - MTK_RX_ETH_HLEN;
return SKB_DATA_ALIGN(MTK_RX_HLEN + mtu) +
SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
@@ -795,7 +795,7 @@ static inline int mtk_max_buf_size(int f
int buf_size = frag_size - NET_SKB_PAD - NET_IP_ALIGN -
SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
- WARN_ON(buf_size < MTK_MAX_RX_LENGTH);
+ WARN_ON(buf_size < MTK_MAX_RX_LENGTH_2K);
return buf_size;
}
@@ -2631,6 +2631,35 @@ static void mtk_uninit(struct net_device
mtk_rx_irq_disable(eth, ~0);
}
+static int mtk_change_mtu(struct net_device *dev, int new_mtu)
+{
+ int length = new_mtu + MTK_RX_ETH_HLEN;
+ struct mtk_mac *mac = netdev_priv(dev);
+ struct mtk_eth *eth = mac->hw;
+ u32 mcr_cur, mcr_new;
+
+ if (!MTK_HAS_CAPS(eth->soc->caps, MTK_SOC_MT7628)) {
+ mcr_cur = mtk_r32(mac->hw, MTK_MAC_MCR(mac->id));
+ mcr_new = mcr_cur & ~MAC_MCR_MAX_RX_MASK;
+
+ if (length <= 1518)
+ mcr_new |= MAC_MCR_MAX_RX(MAC_MCR_MAX_RX_1518);
+ else if (length <= 1536)
+ mcr_new |= MAC_MCR_MAX_RX(MAC_MCR_MAX_RX_1536);
+ else if (length <= 1552)
+ mcr_new |= MAC_MCR_MAX_RX(MAC_MCR_MAX_RX_1552);
+ else
+ mcr_new |= MAC_MCR_MAX_RX(MAC_MCR_MAX_RX_2048);
+
+ 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);
@@ -2927,6 +2956,7 @@ static const struct net_device_ops mtk_n
.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,
@@ -3029,7 +3059,10 @@ static int mtk_add_mac(struct mtk_eth *e
eth->netdev[id]->irq = eth->irq[0];
eth->netdev[id]->dev.of_node = np;
- eth->netdev[id]->max_mtu = MTK_MAX_RX_LENGTH - MTK_RX_ETH_HLEN;
+ if (MTK_HAS_CAPS(eth->soc->caps, MTK_SOC_MT7628))
+ eth->netdev[id]->max_mtu = MTK_MAX_RX_LENGTH - MTK_RX_ETH_HLEN;
+ else
+ eth->netdev[id]->max_mtu = MTK_MAX_RX_LENGTH_2K - MTK_RX_ETH_HLEN;
return 0;
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.h
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.h
@@ -20,12 +20,13 @@
#include "mtk_ppe.h"
#define MTK_QDMA_PAGE_SIZE 2048
-#define MTK_MAX_RX_LENGTH 1536
+#define MTK_MAX_RX_LENGTH 1536
+#define MTK_MAX_RX_LENGTH_2K 2048
#define MTK_TX_DMA_BUF_LEN 0x3fff
#define MTK_DMA_SIZE 512
#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 | \
@@ -352,7 +353,12 @@
/* Mac control registers */
#define MTK_MAC_MCR(x) (0x10100 + (x * 0x100))
-#define MAC_MCR_MAX_RX_1536 BIT(24)
+#define MAC_MCR_MAX_RX_MASK GENMASK(25, 24)
+#define MAC_MCR_MAX_RX(_x) (MAC_MCR_MAX_RX_MASK & ((_x) << 24))
+#define MAC_MCR_MAX_RX_1518 0x0
+#define MAC_MCR_MAX_RX_1536 0x1
+#define MAC_MCR_MAX_RX_1552 0x2
+#define MAC_MCR_MAX_RX_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)
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