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Rockchip MAC TO MAC Linux Guide

文件标识：RK-KF-YF-128

发布版本：V1.0.0

日期：2020-09-21

文件密级：□绝密 □秘密 □内部资料 ■公开

免责声明

本文档按“现状”提供，瑞芯微电子股份有限公司（“本公司”，下同）不对本文档的任何陈述、信息和内容的准确性、可靠性、完整性、适销性、特定目的性和非侵权性提供任何明示或暗示的声明或保证。本文档仅作为使用指导的参考。

由于产品版本升级或其他原因，本文档将可能在未经任何通知的情况下，不定期进行更新或修改。

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瑞芯微电子股份有限公司

Rockchip Electronics Co., Ltd.

地址： 福建省福州市铜盘路软件园A区18号

网址： www.rock-chips.com

客户服务电话： +86-4007-700-590

客户服务传真： +86-591-83951833

客户服务邮箱： fae@rock-chips.com

前言

概述

本文提供一个 MAC 连接 MAC， 没有 PHY 的方案，适用于两个 AP 通过 MAC 相连， 或者 AP 的 MAC 和 SWITCH 的 MAC 相连。两个 AP 经 MAC 相连的方案，通过该方式，可以节省两个 PHY 的成本。分为 RMII 和 RGMII 两种连接方式 。

产品版本

芯片名称内核版本
所有芯片所有版本

读者对象

本文档（本指南）主要适用于以下工程师：

技术支持工程师

软件开发工程师

修订记录

版本号作者修改日期修改说明
V1.0.0吴达超2020-09-21初始版本

目录

[TOC]

RMII​

硬件连接​

RMII 直连如下所示，其中 RX_ERR 需要接地。

MAC0     --RMII--   MAC1

TXD[1:0] --------   RXD[1:0]
TX_EN    --------   RX_DV
REF_CLK  --------   REF_CLK
RXD[1:0] --------   TXD[1:0]
RX_DV    --------   TX_EN
RX_ERR   --------   GND
GND      --------   RX_ERR

软件配置​

以 PX30 和 RV1126 为例， RV1126 输出 50M 参考时钟，PX30 配置为时钟输入模式。

  • rv1126 clock output:

    该补丁为 Linux4.19 内核下的。

diff --git a/arch/arm/boot/dts/rv1126-evb-v10.dtsi b/arch/arm/boot/dts/rv1126-evb-v10.dtsi
index 396ef1516054..a384e657ebac 100644
--- a/arch/arm/boot/dts/rv1126-evb-v10.dtsi
+++ b/arch/arm/boot/dts/rv1126-evb-v10.dtsi
@@ -568,26 +568,21 @@
 };

 &gmac {
-       phy-mode = "rgmii";
-       clock_in_out = "input";
+       phy-mode = "rmii";
+       clock_in_out = "output";

-       snps,reset-gpio = <&gpio3 RK_PA0 GPIO_ACTIVE_LOW>;
-       snps,reset-active-low;
-       /* Reset time is 20ms, 100ms for rtl8211f */
-       snps,reset-delays-us = <0 20000 100000>;
-
-       assigned-clocks = <&cru CLK_GMAC_SRC>, <&cru CLK_GMAC_TX_RX>, <&cru CLK_GMAC_ETHERNET_OUT>;
-       assigned-clock-parents = <&cru CLK_GMAC_SRC_M1>, <&cru RGMII_MODE_CLK>;
-       assigned-clock-rates = <125000000>, <0>, <25000000>;
+       assigned-clocks = <&cru CLK_GMAC_SRC_M1>, <&cru CLK_GMAC_SRC>, <&cru CLK_GMAC_TX_RX>;
+       assigned-clock-rates = <0>, <50000000>;
+       assigned-clock-parents = <&cru CLK_GMAC_RGMII_M1>, <&cru CLK_GMAC_SRC_M1>, <&cru RMII_MODE_CLK>;

        pinctrl-names = "default";
-       pinctrl-0 = <&rgmiim1_pins &clk_out_ethernetm1_pins>;
-
-       tx_delay = <0x2a>;
-       rx_delay = <0x1a>;
+       pinctrl-0 = <&rmiim1_pins &gmac_clk_m1_drv_level0_pins>;

-       phy-handle = <&phy>;
        status = "okay";
+       fixed-link {
+               speed = <100>;
+               full-duplex;
+       };
 };

 &i2c0 {

  • px30 clock input:

    该改动为 Linux4.4 内核下的补丁。

diff --git a/arch/arm64/boot/dts/rockchip/px30-evb-ddr3-v10-linux.dts b/arch/arm64/boot/dts/rockchip/px30-evb-ddr3-v10-linux.dts
index 7693764a0dbe..6f548808e3ec 100644
--- a/arch/arm64/boot/dts/rockchip/px30-evb-ddr3-v10-linux.dts
+++ b/arch/arm64/boot/dts/rockchip/px30-evb-ddr3-v10-linux.dts
@@ -326,11 +326,17 @@

 &gmac {
        phy-supply = <&vcc_phy>;
-       clock_in_out = "output";
-       snps,reset-gpio = <&gpio2 13 GPIO_ACTIVE_LOW>;
-       snps,reset-active-low;
-       snps,reset-delays-us = <0 50000 50000>;
+       clock_in_out = "input";
+       assigned-clocks = <&cru SCLK_GMAC>;
+       assigned-clock-parents = <&gmac_clkin>;
+       pinctrl-names = "default";
+       pinctrl-0 = <&rmii_pins &mac_refclk>;
        status = "okay";
+
+       fixed-link {
+               speed = <100>;
+               full-duplex;
+       };
 };

 &gpu {
diff --git a/arch/arm64/configs/px30_linux_defconfig b/arch/arm64/configs/px30_linux_defconfig
index b73d05c8ad26..486e971c2d90 100644
--- a/arch/arm64/configs/px30_linux_defconfig
+++ b/arch/arm64/configs/px30_linux_defconfig
@@ -136,6 +136,7 @@ CONFIG_STMMAC_ETH=y
 # CONFIG_NET_VENDOR_VIA is not set
 # CONFIG_NET_VENDOR_WIZNET is not set
 CONFIG_ROCKCHIP_PHY=y
+CONFIG_FIXED_PHY=y
 CONFIG_USB_RTL8150=y
 CONFIG_USB_RTL8152=y
 CONFIG_USB_NET_CDC_MBIM=y

测试结果​

以 PX30 和 RV1126 为例的测试结果。

TCP 测试​

  • RV1126 -> PX30
[root@RV1126_RV1109:/]# iperf -c 192.168.1.101 -i 1 -t 10
------------------------------------------------------------
Client connecting to 192.168.1.101, TCP port 5001
TCP window size: 43.8 KByte (default)
------------------------------------------------------------
[  3] local 192.168.1.100 port 48618 connected with 192.168.1.101 port 5001
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0- 1.0 sec  11.6 MBytes  97.5 Mbits/sec
[  3]  1.0- 2.0 sec  11.0 MBytes  94.3 Mbits/sec
[  3]  2.0- 3.0 sec  11.1 MBytes  93.3 Mbits/sec
[  3]  3.0- 4.0 sec  11.3 MBytes  93.3 Mbits/sec
[  3]  4.0- 5.0 sec  11.2 MBytes  94.4 Mbits/sec
[  3]  5.0- 6.0 sec  11.3 MBytes  94.3 Mbits/sec
[  3]  6.0- 7.0 sec  11.2 MBytes  94.3 Mbits/sec
[  3]  7.0- 8.0 sec  11.3 MBytes  93.3 Mbits/sec
[  3]  8.0- 9.0 sec  11.1 MBytes  94.3 Mbits/sec
[  3]  9.0-10.0 sec  11.2 MBytes  93.3 Mbits/sec
[  3]  0.0-10.0 sec   112 MBytes  94.0 Mbits/sec
  • PX30 -> RV1126
[root@px30_64:/]# iperf -c 192.168.1.100 -i 1 -t 10
------------------------------------------------------------
Client connecting to 192.168.1.100, TCP port 5001
TCP window size: 45.0 KByte (default)
------------------------------------------------------------
[  3] local 192.168.1.101 port 52690 connected with 192.168.1.100 port 5001
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0- 1.0 sec  11.5 MBytes  96.5 Mbits/sec
[  3]  1.0- 2.0 sec  11.2 MBytes  94.4 Mbits/sec
[  3]  2.0- 3.0 sec  11.4 MBytes  95.4 Mbits/sec
[  3]  3.0- 4.0 sec  11.1 MBytes  93.3 Mbits/sec
[  3]  4.0- 5.0 sec  11.2 MBytes  94.4 Mbits/sec
[  3]  5.0- 6.0 sec  11.1 MBytes  93.3 Mbits/sec
[  3]  6.0- 7.0 sec  11.4 MBytes  95.4 Mbits/sec
[  3]  7.0- 8.0 sec  11.2 MBytes  94.4 Mbits/sec
[  3]  8.0- 9.0 sec  11.1 MBytes  93.3 Mbits/sec
[  3]  9.0-10.0 sec  11.2 MBytes  94.4 Mbits/sec
[  3]  0.0-10.0 sec   113 MBytes  94.4 Mbits/sec

UDP 测试​

  • RV1126 -> PX30
[root@RV1126_RV1109:/]# iperf -c 192.168.1.101 -i 1 -t 10 -u -b 100M
------------------------------------------------------------
Client connecting to 192.168.1.101, UDP port 5001
Sending 1470 byte datagrams, IPG target: 112.15 us (kalman adjust)
UDP buffer size:  160 KByte (default)
------------------------------------------------------------
[  3] local 192.168.1.100 port 48888 connected with 192.168.1.101 port 5001
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0- 1.0 sec  11.5 MBytes  96.3 Mbits/sec
[  3]  1.0- 2.0 sec  11.4 MBytes  95.7 Mbits/sec
[  3]  2.0- 3.0 sec  11.4 MBytes  95.9 Mbits/sec
[  3]  3.0- 4.0 sec  11.4 MBytes  95.5 Mbits/sec
[  3]  4.0- 5.0 sec  11.4 MBytes  95.6 Mbits/sec
[  3]  5.0- 6.0 sec  11.4 MBytes  95.6 Mbits/sec
[  3]  6.0- 7.0 sec  11.4 MBytes  95.6 Mbits/sec
[  3]  7.0- 8.0 sec  11.4 MBytes  96.0 Mbits/sec
[  3]  8.0- 9.0 sec  11.4 MBytes  95.7 Mbits/sec
[  3]  9.0-10.0 sec  11.4 MBytes  95.6 Mbits/sec
[  3]  0.0-10.0 sec   114 MBytes  95.7 Mbits/sec
[  3] Sent 81437 datagrams
[  3] Server Report:
[  3]  0.0-10.0 sec   114 MBytes  95.7 Mbits/sec   0.000 ms    0/81437 (0%)
  • PX30 -> RV1126
[root@px30_64:/]# iperf -c 192.168.1.100 -i 1 -t 10 -u -b 100M
------------------------------------------------------------
Client connecting to 192.168.1.100, UDP port 5001
Sending 1470 byte datagrams, IPG target: 112.15 us (kalman adjust)
UDP buffer size:  208 KByte (default)
------------------------------------------------------------
[  3] local 192.168.1.101 port 41144 connected with 192.168.1.100 port 5001
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0- 1.0 sec  11.3 MBytes  95.0 Mbits/sec
[  3]  1.0- 2.0 sec  11.4 MBytes  95.6 Mbits/sec
[  3]  2.0- 3.0 sec  11.4 MBytes  95.6 Mbits/sec
[  3]  3.0- 4.0 sec  11.3 MBytes  95.0 Mbits/sec
[  3]  4.0- 5.0 sec  11.4 MBytes  96.0 Mbits/sec
[  3]  5.0- 6.0 sec  11.2 MBytes  94.3 Mbits/sec
[  3]  6.0- 7.0 sec  11.4 MBytes  95.6 Mbits/sec
[  3]  7.0- 8.0 sec  11.4 MBytes  95.6 Mbits/sec
[  3]  8.0- 9.0 sec  11.4 MBytes  95.7 Mbits/sec
[  3]  0.0-10.0 sec   114 MBytes  95.4 Mbits/sec
[  3] Sent 81133 datagrams
[  3] Server Report:
[  3]  0.0-10.0 sec   114 MBytes  95.4 Mbits/sec   0.000 ms    0/81133 (0%)

PING 测试​

  • RV1126 -> PX30
[root@RV1126_RV1109:/]# ping -s 65500 192.168.1.101 -c 100
PING 192.168.1.101 (192.168.1.101) 65500(65528) bytes of data.
65508 bytes from 192.168.1.101: icmp_seq=1 ttl=64 time=12.5 ms
65508 bytes from 192.168.1.101: icmp_seq=2 ttl=64 time=13.1 ms
65508 bytes from 192.168.1.101: icmp_seq=3 ttl=64 time=50.8 ms
65508 bytes from 192.168.1.101: icmp_seq=4 ttl=64 time=12.5 ms
65508 bytes from 192.168.1.101: icmp_seq=5 ttl=64 time=12.6 ms
65508 bytes from 192.168.1.101: icmp_seq=6 ttl=64 time=12.5 ms
.............................................................
65508 bytes from 192.168.1.101: icmp_seq=95 ttl=64 time=12.7 ms
65508 bytes from 192.168.1.101: icmp_seq=96 ttl=64 time=12.5 ms
65508 bytes from 192.168.1.101: icmp_seq=97 ttl=64 time=12.6 ms
65508 bytes from 192.168.1.101: icmp_seq=98 ttl=64 time=14.5 ms
65508 bytes from 192.168.1.101: icmp_seq=99 ttl=64 time=46.6 ms
65508 bytes from 192.168.1.101: icmp_seq=100 ttl=64 time=12.9 ms

--- 192.168.1.101 ping statistics ---
100 packets transmitted, 100 received, 0% packet loss, time 99155ms
rtt min/avg/max/mdev = 12.369/15.634/15.890/0.572 ms
  • PX30 -> RV1126
[root@px30_64:/]# ping -s 65500 192.168.1.100 -c 100
PING 192.168.1.100 (192.168.1.100) 65500(65528) bytes of data.
65508 bytes from 192.168.1.100: icmp_seq=1 ttl=64 time=12.8 ms
65508 bytes from 192.168.1.100: icmp_seq=2 ttl=64 time=12.9 ms
65508 bytes from 192.168.1.100: icmp_seq=3 ttl=64 time=12.5 ms
65508 bytes from 192.168.1.100: icmp_seq=4 ttl=64 time=12.8 ms
65508 bytes from 192.168.1.100: icmp_seq=5 ttl=64 time=12.4 ms
65508 bytes from 192.168.1.100: icmp_seq=6 ttl=64 time=13.1 ms
65508 bytes from 192.168.1.100: icmp_seq=7 ttl=64 time=12.3 ms
65508 bytes from 192.168.1.100: icmp_seq=8 ttl=64 time=12.6 ms
.............................................................
65508 bytes from 192.168.1.100: icmp_seq=95 ttl=64 time=12.3 ms
65508 bytes from 192.168.1.100: icmp_seq=96 ttl=64 time=13.0 ms
65508 bytes from 192.168.1.100: icmp_seq=97 ttl=64 time=12.7 ms
65508 bytes from 192.168.1.100: icmp_seq=98 ttl=64 time=12.6 ms
65508 bytes from 192.168.1.100: icmp_seq=99 ttl=64 time=12.8 ms
65508 bytes from 192.168.1.100: icmp_seq=100 ttl=64 time=12.6 ms

--- 192.168.1.100 ping statistics ---
100 packets transmitted, 100 received, 0% packet loss, time 99184ms
rtt min/avg/max/mdev = 12.177/12.748/14.039/0.384 ms

RGMII​

硬件连接​

RGMII 直连如下所示。

MAC0     --RGMII--  MAC1

TXD[3:0] ---------  RXD[3:0]
TX_EN    ---------  RX_DV
TX_CLK   ---------  RX_CLK
RXD[3:0] ---------  TXD[3:0]
RX_DV    ---------  TX_EN
RX_CLK   ---------  TX_CLK

软件配置​

以两个 RK3399 直连为例， 需要能输出 125M TXC 时钟，配置为时钟输出模式。 该补丁为 Linux4.4 内核下的。

diff --git a/arch/arm64/boot/dts/rockchip/rk3399-sapphire.dtsi b/arch/arm64/boot/dts/rockchip/rk3399-sapphire.dtsi
index a4076b888f7d..27a853b48c8a 100644
--- a/arch/arm64/boot/dts/rockchip/rk3399-sapphire.dtsi
+++ b/arch/arm64/boot/dts/rockchip/rk3399-sapphire.dtsi
@@ -216,17 +216,23 @@
 &gmac {
        phy-supply = <&vcc_phy>;
        phy-mode = "rgmii";
-       clock_in_out = "input";
+       clock_in_out = "output";
        snps,reset-gpio = <&gpio3 15 GPIO_ACTIVE_LOW>;
        snps,reset-active-low;
        snps,reset-delays-us = <0 10000 50000>;
        assigned-clocks = <&cru SCLK_RMII_SRC>;
-       assigned-clock-parents = <&clkin_gmac>;
+       assigned-clock-parents = <&cru SCLK_MAC>;
+       assigned-clock-rates = <125000000>;
        pinctrl-names = "default";
        pinctrl-0 = <&rgmii_pins>;
        tx_delay = <0x28>;
        rx_delay = <0x11>;
        status = "okay";
+
+       fixed-link {
+               speed = <1000>;
+               full-duplex;
+       }
 };

Delayline 配置​

RGMII 接口需要配置 Delayline， 一般的做法是通过 PHY 来扫这个窗口， 但MAC To MAC 方式没有 PHY， 所以现在通过示波器来测量 TX 的 Delayline。 关闭两个 MAC 的 RX Delayline， 调节 TX 的 Delayline，使得 Delay 在 1.5-2ns 之间。

![1](Rockchip_Developer_Guide_Linux_MAC_TO_MAC/Ethernet RGMII TXC TXD Skew.png)