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difos/target/linux/realtek/files-6.12/drivers/net/ethernet/rtl838x_eth.h
Markus Stockhausen 963ee6ac3f realtek: avoid interrupt storm on mass packet receive 
RTL83xx devices have two types of receive interrupts for each of its
8 rings. One for packet received and another for ring overflow. When
the switch is flooded with incoming packets the receive handler will
disable the packet receive notification but still keeps the overflow
notification enabled. While the receive path "slowly" processes the
received packets each new packet triggers the overflow IRQ again. The
device becomes unresponsive and eventually produces messages like:

[18441.709764] rcu: Stack dump where RCU GP kthread last ran:
[18441.727892] Sending NMI from CPU 1 to CPUs 0:
[18441.742300] NMI backtrace for cpu 0 skipped: idling at 0x8080e994
[18415.251700] rcu: INFO: rcu_sched detected stalls on CPUs/tasks:
[18415.271350] rcu:     0-...!: (0 ticks this GP) idle=d740/0/0x0 ...
[18415.303046] rcu:     (detected by 1, t=6004 jiffies, g=230925, ...
[18415.326095] Sending NMI from CPU 1 to CPUs 0:
[18415.340540] NMI backtrace for cpu 0

Fix this issue by always disabling receive and overflow interrupts at
the same time.

Test with hping3 --udp -p 5021 -d 1400 --flood 192.168.2.72

Before (3sec run):
[183260.324846] rtl838x-eth 1b00a300.ethernet eth0: RX buffer overrun: status 0x101, mask: 0x7ffeff
[183260.340524] rtl838x-eth 1b00a300.ethernet eth0: RX buffer overrun: status 0x1, mask: 0x7ffeff
[183260.345799] net_ratelimit: 489997 callbacks suppressed

After (3 sec run):
[  373.981479] rtl838x-eth 1b00a300.ethernet eth0: rx ring overrun: status 0x101, mask: 0x7fffff
[  374.031118] rtl838x-eth 1b00a300.ethernet eth0: rx ring overrun: status 0x101, mask: 0x7fffff
[  377.919996] net_ratelimit: 34 callbacks suppressed

Signed-off-by: Markus Stockhausen <markus.stockhausen@gmx.de>
Link: https://github.com/openwrt/openwrt/pull/19365
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
2025-07-18 23:52:54 +02:00

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/* SPDX-License-Identifier: GPL-2.0-only */
#ifndef _RTL838X_ETH_H
#define _RTL838X_ETH_H
/* Register definition */
/* Per port MAC control */
#define RTL838X_MAC_PORT_CTRL (0xd560)
#define RTL839X_MAC_PORT_CTRL (0x8004)
#define RTL930X_MAC_L2_PORT_CTRL (0x3268)
#define RTL930X_MAC_PORT_CTRL (0x3260)
#define RTL931X_MAC_L2_PORT_CTRL (0x6000)
#define RTL931X_MAC_PORT_CTRL (0x6004)
/* DMA interrupt control and status registers */
#define RTL838X_DMA_IF_CTRL (0x9f58)
#define RTL838X_DMA_IF_INTR_STS (0x9f54)
#define RTL838X_DMA_IF_INTR_MSK (0x9f50)
#define RTL839X_DMA_IF_CTRL (0x786c)
#define RTL839X_DMA_IF_INTR_STS (0x7868)
#define RTL839X_DMA_IF_INTR_MSK (0x7864)
#define RTL930X_DMA_IF_CTRL (0xe028)
#define RTL930X_DMA_IF_INTR_RX_RUNOUT_STS (0xe01C)
#define RTL930X_DMA_IF_INTR_RX_DONE_STS (0xe020)
#define RTL930X_DMA_IF_INTR_TX_DONE_STS (0xe024)
#define RTL930X_DMA_IF_INTR_RX_RUNOUT_MSK (0xe010)
#define RTL930X_DMA_IF_INTR_RX_DONE_MSK (0xe014)
#define RTL930X_DMA_IF_INTR_TX_DONE_MSK (0xe018)
#define RTL930X_L2_NTFY_IF_INTR_MSK (0xe04C)
#define RTL930X_L2_NTFY_IF_INTR_STS (0xe050)
/* TODO: RTL931X_DMA_IF_CTRL has different bits meanings */
#define RTL931X_DMA_IF_CTRL (0x0928)
#define RTL931X_DMA_IF_INTR_RX_RUNOUT_STS (0x091c)
#define RTL931X_DMA_IF_INTR_RX_DONE_STS (0x0920)
#define RTL931X_DMA_IF_INTR_TX_DONE_STS (0x0924)
#define RTL931X_DMA_IF_INTR_RX_RUNOUT_MSK (0x0910)
#define RTL931X_DMA_IF_INTR_RX_DONE_MSK (0x0914)
#define RTL931X_DMA_IF_INTR_TX_DONE_MSK (0x0918)
#define RTL931X_L2_NTFY_IF_INTR_MSK (0x09E4)
#define RTL931X_L2_NTFY_IF_INTR_STS (0x09E8)
#define RTL838X_MAC_FORCE_MODE_CTRL (0xa104)
#define RTL839X_MAC_FORCE_MODE_CTRL (0x02bc)
#define RTL930X_MAC_FORCE_MODE_CTRL (0xCA1C)
#define RTL931X_MAC_FORCE_MODE_CTRL (0x0dcc)
#define RTL839X_DMA_IF_INTR_NOTIFY_MASK GENMASK(22, 20)
#define RTL83XX_DMA_IF_INTR_RX_DONE_MASK GENMASK(15, 8)
#define RTL83XX_DMA_IF_INTR_RX_RUN_OUT_MASK GENMASK(7, 0)
#define RTL83XX_DMA_IF_INTR_RX_MASK(ring) (BIT(ring) | BIT(ring + 8))
/* MAC address settings */
#define RTL838X_MAC (0xa9ec)
#define RTL839X_MAC (0x02b4)
#define RTL838X_MAC_ALE (0x6b04)
#define RTL838X_MAC2 (0xa320)
#define RTL930X_MAC_L2_ADDR_CTRL (0xC714)
#define RTL931X_MAC_L2_ADDR_CTRL (0x135c)
/* Ringbuffer setup */
#define RTL838X_DMA_RX_BASE (0x9f00)
#define RTL839X_DMA_RX_BASE (0x780c)
#define RTL930X_DMA_RX_BASE (0xdf00)
#define RTL931X_DMA_RX_BASE (0x0800)
#define RTL838X_DMA_TX_BASE (0x9f40)
#define RTL839X_DMA_TX_BASE (0x784c)
#define RTL930X_DMA_TX_BASE (0xe000)
#define RTL931X_DMA_TX_BASE (0x0900)
#define RTL838X_DMA_IF_RX_RING_SIZE (0xB7E4)
#define RTL839X_DMA_IF_RX_RING_SIZE (0x6038)
#define RTL930X_DMA_IF_RX_RING_SIZE (0x7C60)
#define RTL931X_DMA_IF_RX_RING_SIZE (0x2080)
#define RTL838X_DMA_IF_RX_RING_CNTR (0xB7E8)
#define RTL839X_DMA_IF_RX_RING_CNTR (0x603c)
#define RTL930X_DMA_IF_RX_RING_CNTR (0x7C8C)
#define RTL931X_DMA_IF_RX_RING_CNTR (0x20AC)
#define RTL838X_DMA_IF_RX_CUR (0x9F20)
#define RTL839X_DMA_IF_RX_CUR (0x782c)
#define RTL930X_DMA_IF_RX_CUR (0xdf80)
#define RTL931X_DMA_IF_RX_CUR (0x0880)
#define RTL838X_DMA_IF_TX_CUR_DESC_ADDR_CTRL (0x9F48)
#define RTL930X_DMA_IF_TX_CUR_DESC_ADDR_CTRL (0xE008)
#define RTL838X_DMY_REG31 (0x3b28)
#define RTL838X_SDS_MODE_SEL (0x0028)
#define RTL838X_SDS_CFG_REG (0x0034)
#define RTL838X_INT_MODE_CTRL (0x005c)
#define RTL838X_CHIP_INFO (0x00d8)
#define RTL838X_SDS4_REG28 (0xef80)
#define RTL838X_SDS4_DUMMY0 (0xef8c)
#define RTL838X_SDS5_EXT_REG6 (0xf18c)
/* L2 features */
#define RTL839X_TBL_ACCESS_L2_CTRL (0x1180)
#define RTL839X_TBL_ACCESS_L2_DATA(idx) (0x1184 + ((idx) << 2))
#define RTL838X_TBL_ACCESS_CTRL_0 (0x6914)
#define RTL838X_TBL_ACCESS_DATA_0(idx) (0x6918 + ((idx) << 2))
/* MAC-side link state handling */
#define RTL838X_MAC_LINK_STS (0xa188)
#define RTL839X_MAC_LINK_STS (0x0390)
#define RTL930X_MAC_LINK_STS (0xCB10)
#define RTL931X_MAC_LINK_STS (0x0ec0)
#define RTL838X_MAC_LINK_SPD_STS (0xa190)
#define RTL839X_MAC_LINK_SPD_STS (0x03a0)
#define RTL930X_MAC_LINK_SPD_STS (0xCB18)
#define RTL931X_MAC_LINK_SPD_STS (0x0ed0)
#define RTL838X_MAC_LINK_DUP_STS (0xa19c)
#define RTL839X_MAC_LINK_DUP_STS (0x03b0)
#define RTL930X_MAC_LINK_DUP_STS (0xCB28)
#define RTL931X_MAC_LINK_DUP_STS (0x0ef0)
/* TODO: RTL8390_MAC_LINK_MEDIA_STS_ADDR??? */
#define RTL838X_MAC_TX_PAUSE_STS (0xa1a0)
#define RTL839X_MAC_TX_PAUSE_STS (0x03b8)
#define RTL930X_MAC_TX_PAUSE_STS (0xCB2C)
#define RTL931X_MAC_TX_PAUSE_STS (0x0ef8)
#define RTL838X_MAC_RX_PAUSE_STS (0xa1a4)
#define RTL839X_MAC_RX_PAUSE_STS (0xCB30)
#define RTL930X_MAC_RX_PAUSE_STS (0xC2F8)
#define RTL931X_MAC_RX_PAUSE_STS (0x0f00)
#define RTL838X_EEE_TX_TIMER_GIGA_CTRL (0xaa04)
#define RTL838X_EEE_TX_TIMER_GELITE_CTRL (0xaa08)
#define RTL930X_L2_UNKN_UC_FLD_PMSK (0x9064)
#define RTL931X_L2_UNKN_UC_FLD_PMSK (0xC8F4)
#define RTL839X_MAC_GLB_CTRL (0x02a8)
#define RTL839X_SCHED_LB_TICK_TKN_CTRL (0x60f8)
#define RTL838X_L2_TBL_FLUSH_CTRL (0x3370)
#define RTL839X_L2_TBL_FLUSH_CTRL (0x3ba0)
#define RTL930X_L2_TBL_FLUSH_CTRL (0x9404)
#define RTL931X_L2_TBL_FLUSH_CTRL (0xCD9C)
#define RTL930X_L2_PORT_SABLK_CTRL (0x905c)
#define RTL930X_L2_PORT_DABLK_CTRL (0x9060)
/* MAC link state bits */
#define FORCE_EN (1 << 0)
#define FORCE_LINK_EN (1 << 1)
#define NWAY_EN (1 << 2)
#define DUPLX_MODE (1 << 3)
#define TX_PAUSE_EN (1 << 6)
#define RX_PAUSE_EN (1 << 7)
/* L2 Notification DMA interface */
#define RTL839X_DMA_IF_NBUF_BASE_DESC_ADDR_CTRL (0x785C)
#define RTL839X_L2_NOTIFICATION_CTRL (0x7808)
#define RTL931X_L2_NTFY_RING_BASE_ADDR (0x09DC)
#define RTL931X_L2_NTFY_RING_CUR_ADDR (0x09E0)
#define RTL839X_L2_NOTIFICATION_CTRL (0x7808)
#define RTL931X_L2_NTFY_CTRL (0xCDC8)
#define RTL838X_L2_CTRL_0 (0x3200)
#define RTL839X_L2_CTRL_0 (0x3800)
#define RTL930X_L2_CTRL (0x8FD8)
#define RTL931X_L2_CTRL (0xC800)
/* TRAPPING to CPU-PORT */
#define RTL838X_SPCL_TRAP_IGMP_CTRL (0x6984)
#define RTL838X_RMA_CTRL_0 (0x4300)
#define RTL838X_RMA_CTRL_1 (0x4304)
#define RTL839X_RMA_CTRL_0 (0x1200)
#define RTL839X_SPCL_TRAP_IGMP_CTRL (0x1058)
#define RTL839X_RMA_CTRL_1 (0x1204)
#define RTL839X_RMA_CTRL_2 (0x1208)
#define RTL839X_RMA_CTRL_3 (0x120C)
#define RTL930X_VLAN_APP_PKT_CTRL (0xA23C)
#define RTL930X_RMA_CTRL_0 (0x9E60)
#define RTL930X_RMA_CTRL_1 (0x9E64)
#define RTL930X_RMA_CTRL_2 (0x9E68)
#define RTL931X_VLAN_APP_PKT_CTRL (0x96b0)
#define RTL931X_RMA_CTRL_0 (0x8800)
#define RTL931X_RMA_CTRL_1 (0x8804)
#define RTL931X_RMA_CTRL_2 (0x8808)
/* Advanced SMI control for clause 45 PHYs */
#define RTL930X_SMI_MAC_TYPE_CTRL (0xCA04)
#define RTL930X_SMI_PORT24_27_ADDR_CTRL (0xCB90)
#define RTL930X_SMI_PORT0_15_POLLING_SEL (0xCA08)
#define RTL930X_SMI_PORT16_27_POLLING_SEL (0xCA0C)
#define RTL930X_SMI_10GPHY_POLLING_REG0_CFG (0xCBB4)
#define RTL930X_SMI_10GPHY_POLLING_REG9_CFG (0xCBB8)
#define RTL930X_SMI_10GPHY_POLLING_REG10_CFG (0xCBBC)
#define RTL930X_SMI_PRVTE_POLLING_CTRL (0xCA10)
/* Registers of the internal Serdes of the 8390 */
#define RTL839X_SDS12_13_XSG0 (0xB800)
/* Chip configuration registers of the RTL9310 */
#define RTL931X_MEM_ENCAP_INIT (0x4854)
#define RTL931X_MEM_MIB_INIT (0x7E18)
#define RTL931X_MEM_ACL_INIT (0x40BC)
#define RTL931X_MEM_ALE_INIT_0 (0x83F0)
#define RTL931X_MEM_ALE_INIT_1 (0x83F4)
#define RTL931X_MEM_ALE_INIT_2 (0x82E4)
#define RTL931X_MDX_CTRL_RSVD (0x0fcc)
#define RTL931X_PS_SOC_CTRL (0x13f8)
#define RTL931X_SMI_10GPHY_POLLING_SEL2 (0xCF8)
#define RTL931X_SMI_10GPHY_POLLING_SEL3 (0xCFC)
#define RTL931X_SMI_10GPHY_POLLING_SEL4 (0xD00)
/* 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);
}
inline int rtl839x_mac_port_ctrl(int p)
{
return RTL839X_MAC_PORT_CTRL + (p << 7);
}
/* On the RTL931XX, the functionality of the MAC port control register is split up
* into RTL931X_MAC_L2_PORT_CTRL and RTL931X_MAC_PORT_CTRL the functionality used
* by the Ethernet driver is in the same bits now in RTL931X_MAC_L2_PORT_CTRL
*/
inline int rtl930x_mac_port_ctrl(int p)
{
return RTL930X_MAC_L2_PORT_CTRL + (p << 6);
}
inline int rtl931x_mac_port_ctrl(int p)
{
return RTL931X_MAC_L2_PORT_CTRL + (p << 7);
}
inline int rtl838x_dma_if_rx_ring_size(int i)
{
return RTL838X_DMA_IF_RX_RING_SIZE + ((i >> 3) << 2);
}
inline int rtl839x_dma_if_rx_ring_size(int i)
{
return RTL839X_DMA_IF_RX_RING_SIZE + ((i >> 3) << 2);
}
inline int rtl930x_dma_if_rx_ring_size(int i)
{
return RTL930X_DMA_IF_RX_RING_SIZE + ((i / 3) << 2);
}
inline int rtl931x_dma_if_rx_ring_size(int i)
{
return RTL931X_DMA_IF_RX_RING_SIZE + ((i / 3) << 2);
}
inline int rtl838x_dma_if_rx_ring_cntr(int i)
{
return RTL838X_DMA_IF_RX_RING_CNTR + ((i >> 3) << 2);
}
inline int rtl839x_dma_if_rx_ring_cntr(int i)
{
return RTL839X_DMA_IF_RX_RING_CNTR + ((i >> 3) << 2);
}
inline int rtl930x_dma_if_rx_ring_cntr(int i)
{
return RTL930X_DMA_IF_RX_RING_CNTR + ((i / 3) << 2);
}
inline int rtl931x_dma_if_rx_ring_cntr(int i)
{
return RTL931X_DMA_IF_RX_RING_CNTR + ((i / 3) << 2);
}
inline u32 rtl838x_get_mac_link_sts(int port)
{
return (sw_r32(RTL838X_MAC_LINK_STS) & BIT(port));
}
inline u32 rtl839x_get_mac_link_sts(int p)
{
return (sw_r32(RTL839X_MAC_LINK_STS + ((p >> 5) << 2)) & BIT(p % 32));
}
inline u32 rtl930x_get_mac_link_sts(int port)
{
u32 link = sw_r32(RTL930X_MAC_LINK_STS);
link = sw_r32(RTL930X_MAC_LINK_STS);
pr_info("%s link state is %08x\n", __func__, link);
return link & BIT(port);
}
inline u32 rtl931x_get_mac_link_sts(int p)
{
return (sw_r32(RTL931X_MAC_LINK_STS + ((p >> 5) << 2)) & BIT(p % 32));
}
inline u32 rtl838x_get_mac_link_dup_sts(int port)
{
return (sw_r32(RTL838X_MAC_LINK_DUP_STS) & BIT(port));
}
inline u32 rtl839x_get_mac_link_dup_sts(int p)
{
return (sw_r32(RTL839X_MAC_LINK_DUP_STS + ((p >> 5) << 2)) & BIT(p % 32));
}
inline u32 rtl930x_get_mac_link_dup_sts(int port)
{
return (sw_r32(RTL930X_MAC_LINK_DUP_STS) & BIT(port));
}
inline u32 rtl931x_get_mac_link_dup_sts(int p)
{
return (sw_r32(RTL931X_MAC_LINK_DUP_STS + ((p >> 5) << 2)) & BIT(p % 32));
}
inline u32 rtl838x_get_mac_link_spd_sts(int port)
{
int r = RTL838X_MAC_LINK_SPD_STS + ((port >> 4) << 2);
u32 speed = sw_r32(r);
speed >>= (port % 16) << 1;
return (speed & 0x3);
}
inline u32 rtl839x_get_mac_link_spd_sts(int port)
{
int r = RTL839X_MAC_LINK_SPD_STS + ((port >> 4) << 2);
u32 speed = sw_r32(r);
speed >>= (port % 16) << 1;
return (speed & 0x3);
}
inline u32 rtl930x_get_mac_link_spd_sts(int port)
{
int r = RTL930X_MAC_LINK_SPD_STS + ((port >> 3) << 2);
u32 speed = sw_r32(r);
speed >>= (port % 8) << 2;
return (speed & 0xf);
}
inline u32 rtl931x_get_mac_link_spd_sts(int port)
{
int r = RTL931X_MAC_LINK_SPD_STS + ((port >> 3) << 2);
u32 speed = sw_r32(r);
speed >>= (port % 8) << 2;
return (speed & 0xf);
}
inline u32 rtl838x_get_mac_rx_pause_sts(int port)
{
return (sw_r32(RTL838X_MAC_RX_PAUSE_STS) & (1 << port));
}
inline u32 rtl839x_get_mac_rx_pause_sts(int p)
{
return (sw_r32(RTL839X_MAC_RX_PAUSE_STS + ((p >> 5) << 2)) & BIT(p % 32));
}
inline u32 rtl930x_get_mac_rx_pause_sts(int port)
{
return (sw_r32(RTL930X_MAC_RX_PAUSE_STS) & (1 << port));
}
inline u32 rtl931x_get_mac_rx_pause_sts(int p)
{
return (sw_r32(RTL931X_MAC_RX_PAUSE_STS + ((p >> 5) << 2)) & BIT(p % 32));
}
inline u32 rtl838x_get_mac_tx_pause_sts(int port)
{
return (sw_r32(RTL838X_MAC_TX_PAUSE_STS) & (1 << port));
}
inline u32 rtl839x_get_mac_tx_pause_sts(int p)
{
return (sw_r32(RTL839X_MAC_TX_PAUSE_STS + ((p >> 5) << 2)) & BIT(p % 32));
}
inline u32 rtl930x_get_mac_tx_pause_sts(int port)
{
return (sw_r32(RTL930X_MAC_TX_PAUSE_STS) & (1 << port));
}
inline u32 rtl931x_get_mac_tx_pause_sts(int p)
{
return (sw_r32(RTL931X_MAC_TX_PAUSE_STS + ((p >> 5) << 2)) & BIT(p % 32));
}
struct p_hdr;
struct dsa_tag;
struct rtl838x_eth_reg {
irqreturn_t (*net_irq)(int irq, void *dev_id);
int (*mac_port_ctrl)(int port);
int dma_if_intr_sts;
int dma_if_intr_msk;
int dma_if_intr_rx_runout_sts;
int dma_if_intr_rx_done_sts;
int dma_if_intr_tx_done_sts;
int dma_if_intr_rx_runout_msk;
int dma_if_intr_rx_done_msk;
int dma_if_intr_tx_done_msk;
int l2_ntfy_if_intr_sts;
int l2_ntfy_if_intr_msk;
int dma_if_ctrl;
int mac_force_mode_ctrl;
int dma_rx_base;
int dma_tx_base;
int (*dma_if_rx_ring_size)(int ring);
int (*dma_if_rx_ring_cntr)(int ring);
int dma_if_rx_cur;
int rst_glb_ctrl;
u32 (*get_mac_link_sts)(int port);
u32 (*get_mac_link_dup_sts)(int port);
u32 (*get_mac_link_spd_sts)(int port);
u32 (*get_mac_rx_pause_sts)(int port);
u32 (*get_mac_tx_pause_sts)(int port);
int mac;
int l2_tbl_flush_ctrl;
void (*update_cntr)(int r, int work_done);
void (*create_tx_header)(struct p_hdr *h, unsigned int dest_port, int prio);
bool (*decode_tag)(struct p_hdr *h, struct dsa_tag *tag);
};
int phy_package_port_read_paged(struct phy_device *phydev, int port, int page, u32 regnum);
int phy_package_port_write_paged(struct phy_device *phydev, int port, int page, u32 regnum, u16 val);
int phy_package_read_paged(struct phy_device *phydev, int page, u32 regnum);
int phy_package_write_paged(struct phy_device *phydev, int page, u32 regnum, u16 val);
int phy_port_read_paged(struct phy_device *phydev, int port, int page, u32 regnum);
int phy_port_write_paged(struct phy_device *phydev, int port, int page, u32 regnum, u16 val);
#endif /* _RTL838X_ETH_H */
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