Rockchip MAC TO MAC Linux Guide

1. RMII

1.1 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

1.2 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:

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

1.3 测试结果

以 PX30 和 RV1126 为例的测试结果。

1.3.1 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
1.3.2 UDP 测试
RV1126 -> PX30
PX30 -> RV1126
[ 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

1.3.2 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%)

1.3.3 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.
bytes from 192.168.1.101: icmp_seq=1 ttl=64 time=12.5 ms
bytes from 192.168.1.101: icmp_seq=2 ttl=64 time=13.1 ms
bytes from 192.168.1.101: icmp_seq=3 ttl=64 time=50.8 ms
bytes from 192.168.1.101: icmp_seq=4 ttl=64 time=12.5 ms
bytes from 192.168.1.101: icmp_seq=5 ttl=64 time=12.6 ms
bytes from 192.168.1.101: icmp_seq=6 ttl=64 time=12.5 ms
.............................................................
bytes from 192.168.1.101: icmp_seq=95 ttl=64 time=12.7 ms
bytes from 192.168.1.101: icmp_seq=96 ttl=64 time=12.5 ms
bytes from 192.168.1.101: icmp_seq=97 ttl=64 time=12.6 ms
bytes from 192.168.1.101: icmp_seq=98 ttl=64 time=14.5 ms
bytes from 192.168.1.101: icmp_seq=99 ttl=64 time=46.6 ms
bytes from 192.168.1.101: icmp_seq=100 ttl=64 time=12.9 ms
--- 192.168.1.101 ping statistics ---
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.
bytes from 192.168.1.100: icmp_seq=1 ttl=64 time=12.8 ms
bytes from 192.168.1.100: icmp_seq=2 ttl=64 time=12.9 ms
bytes from 192.168.1.100: icmp_seq=3 ttl=64 time=12.5 ms
bytes from 192.168.1.100: icmp_seq=4 ttl=64 time=12.8 ms
bytes from 192.168.1.100: icmp_seq=5 ttl=64 time=12.4 ms
bytes from 192.168.1.100: icmp_seq=6 ttl=64 time=13.1 ms
bytes from 192.168.1.100: icmp_seq=7 ttl=64 time=12.3 ms
bytes from 192.168.1.100: icmp_seq=8 ttl=64 time=12.6 ms
.............................................................
bytes from 192.168.1.100: icmp_seq=95 ttl=64 time=12.3 ms
bytes from 192.168.1.100: icmp_seq=96 ttl=64 time=13.0 ms
bytes from 192.168.1.100: icmp_seq=97 ttl=64 time=12.7 ms
bytes from 192.168.1.100: icmp_seq=98 ttl=64 time=12.6 ms
bytes from 192.168.1.100: icmp_seq=99 ttl=64 time=12.8 ms
bytes from 192.168.1.100: icmp_seq=100 ttl=64 time=12.6 ms
--- 192.168.1.100 ping statistics ---
packets transmitted, 100 received, 0% packet loss, time 99184ms
rtt min/avg/max/mdev = 12.177/12.748/14.039/0.384 ms

2. RGMII

2.1. 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

2.2 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;
+ }
};

2.3 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。