transmit queue 0 timed out (RGMII MAC to MAC - i.MX6Q)

weichao_li1 — Wed, 08 Jan 2020 02:11:46 GMT

hello,

我在使用i.MX6Q通过rgmii接口和sja1105通信时，遇到了transmit queue 0 timed out的问题，麻烦支持一下！谢谢！

问题描述：

1）linux内核版本4.14.98。

2）i.MX6Q通过rgmii和sja1105连接，mac to mac，固定为千兆，双工。

3）主要问题是网络不通，ping 100%丢包，过段时间以后出现NETDEV WATCHDOG: eth0 (fec): transmit queue 0 timed out，ping的过程中用示波器测量txc没有时钟信号。

设备树配置：

pinctrl_vmds_enet: vmds_enetgrp {

fsl,pins = <

MX6QDL_PAD_RGMII_TXC__RGMII_TXC 0x1b030

MX6QDL_PAD_RGMII_TD0__RGMII_TD0 0x1b030

MX6QDL_PAD_RGMII_TD1__RGMII_TD1 0x1b030

MX6QDL_PAD_RGMII_TD2__RGMII_TD2 0x1b030

MX6QDL_PAD_RGMII_TD3__RGMII_TD3 0x1b030

MX6QDL_PAD_RGMII_TX_CTL__RGMII_TX_CTL 0x1b030

MX6QDL_PAD_RGMII_RXC__RGMII_RXC 0x1b030

MX6QDL_PAD_RGMII_RD0__RGMII_RD0 0x1b030

MX6QDL_PAD_RGMII_RD1__RGMII_RD1 0x1b030

MX6QDL_PAD_RGMII_RD2__RGMII_RD2 0x1b030

MX6QDL_PAD_RGMII_RD3__RGMII_RD3 0x1b030

MX6QDL_PAD_RGMII_RX_CTL__RGMII_RX_CTL 0x1b030

MX6QDL_PAD_GPIO_16__ENET_REF_CLK 0x4001b0a8

};

&fec {

pinctrl-0 = <&pinctrl_vmds_enet>;

phy-mode = "rgmii-id";

fsl,magic-packet;

fixed-link {

speed = <1000>;

full-duplex;

};

调试过程参考：

1）启动过程信息：

Generic PHY fixed-0:00: attached PHY driver [Generic PHY] (mii_bus:phy_addr=fixed-0:00, irq=POLL)

IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready

fec 2188000.ethernet eth0: Link is Up - 1Gbps/Full - flow control off

IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready

2）ping和ping后ifconfig结果

root@imx6qvmds:~# ping 192.168.100.10

PING 192.168.100.10 (192.168.100.10): 56 data bytes

--- 192.168.100.10 ping statistics ---

9 packets transmitted, 0 packets received, 100% packet loss

root@imx6qvmds:~# ifconfig

eth0 Link encap:Ethernet HWaddr 76:D9:14:98:64:99

inet addr:192.168.100.12 Bcast:192.168.100.255 Mask:255.255.255.0

inet6 addr: fe80::74d9:14ff:fe98:6499/64 Scope:Link

UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

RX packets:0 errors:0 dropped:0 overruns:0 frame:0

TX packets:0 errors:2 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1000

RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)

lo Link encap:Local Loopback

inet addr:127.0.0.1 Mask:255.0.0.0

inet6 addr: ::1/128 Scope:Host

UP LOOPBACK RUNNING MTU:65536 Metric:1

RX packets:47200 errors:0 dropped:0 overruns:0 frame:0

TX packets:47200 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1000

RX bytes:3398720 (3.2 MiB) TX bytes:3398720 (3.2 MiB)

3）在调试fec过程中发现fec_enet_start_xmit已经被调用，但发送中断没有产生，查看bufdesc_ex的内容cbd_esc中INT（TxBD的Offset + A BIT14）设置为1

补充说明：

1）同样的内核代码在imx8qm和qxp上已经测试通过。

2）关于enet中dma的配置，我在imx8的手册上有看到ENET_DMA1CFG，当时imx6的手册上没有找到。

Re: transmit queue 0 timed out (RGMII MAC to MAC - i.MX6Q)

igorpadykov — Wed, 08 Jan 2020 23:18:56 GMT

Hi weichao

one can check solutions provided on

[PATCH] imx6q: work around fec tx-queue timeouts when SATA/SD + ethernet is active with high throughput

Best regards
igor
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Re: transmit queue 0 timed out (RGMII MAC to MAC - i.MX6Q)

weichao_li1 — Thu, 09 Jan 2020 01:40:12 GMT

Hi igorpadykov

非常感谢您的回答！

我之前看过这个补丁，但4.14.98内核的fec.h已经修改了

#define FEC_ENET_RX_PAGES 256
#define FEC_ENET_RX_FRSIZE 2048
#define FEC_ENET_RX_FRPPG (PAGE_SIZE / FEC_ENET_RX_FRSIZE)
#define RX_RING_SIZE (FEC_ENET_RX_FRPPG * FEC_ENET_RX_PAGES)
#define FEC_ENET_TX_FRSIZE 2048
#define FEC_ENET_TX_FRPPG (PAGE_SIZE / FEC_ENET_TX_FRSIZE)
#define TX_RING_SIZE 512 /* Must be power of two */
#define TX_RING_MOD_MASK 511 /* for this to work */

#define BD_ENET_RX_INT 0x00800000

Re: transmit queue 0 timed out (RGMII MAC to MAC - i.MX6Q)

aa136466 — Tue, 02 Nov 2021 08:42:02 GMT

Have you solved this problem? I also have a headache about this problem.

topic Re: transmit queue 0 timed out (RGMII MAC to MAC - i.MX6Q) in i.MX Processors

transmit queue 0 timed out (RGMII MAC to MAC - i.MX6Q)

Re: transmit queue 0 timed out (RGMII MAC to MAC - i.MX6Q)

Re: transmit queue 0 timed out (RGMII MAC to MAC - i.MX6Q)

Re: transmit queue 0 timed out (RGMII MAC to MAC - i.MX6Q)