我们使用RK3568双网口，都是千兆，eth0使用了YT8511 eth1使用了rtl8211 之后内部接了一个交换机RTL8367S芯片。
现在eth0和 eth1 能ping通，eth1走交换机的丢包严重，我参考Rockchip_Developer_Guide_Linux_GMAC_RGMII_Delayline_CN.pdf 扫描delayline，扫描完后没有提示tx和rx的值，显示如下：

[root@RK356X:/sys/devices/platform/fe010000.ethernet]# echo 1000 > phy_lb_scan 
[   57.851469] Delayline scan speed set to 1000
[   58.163087] dwmac4: Master AXI performs any burst length
[   58.356004] RX(0x00):                                                                                                                                
[   58.437843] RX(0x01):              
......
[   65.260426] RX(0x68):                                                                                                                                
[   65.326104] RX(0x69):                                                                                                                                
[   65.392242] RX(0x6a):                                                                                                                                
[   65.458521] RX(0x6b):                                                                                                                                
[   65.524545] RX(0x6c):                                                                                                                                
[   65.590589] RX(0x6d):                                                                                                                                
[   65.656580] RX(0x6e):                                                                                                                                
[   65.722618] RX(0x6f):                                                                                                                                
[   65.788496] RX(0x70):                                                                                                                                
[   65.854468] RX(0x71):                                                                                                                                
[   65.920399] RX(0x72):                                                                                                                                
[   65.986654] RX(0x73):                                                                                                                                
[   66.052717] RX(0x74):                                                                                                                                
[   66.118667] RX(0x75):                                                                                                                                
[   66.184234] RX(0x76):                                                                                                                                
[   66.249642] RX(0x77):                                                                                                                                
[   66.315051] RX(0x78):                                                                                                                                
[   66.380921] RX(0x79):                                                                                                                                
[   66.446570] RX(0x7a):                                                                                                                                
[   66.512489] RX(0x7b):                                                                                                                                
[   66.577834] RX(0x7c):                                                                                                                                
[   66.643487] RX(0x7d):                                                                                                                                
[   66.709139] RX(0x7e):                                                                                                                                
[   66.774753] RX(0x7f):                                                                                                                                
[   66.840444] 
[   66.840444] Can't find suitable delayline
[   67.106551] YT8511 Gigabit Ethernet stmmac-1:00: attached PHY driver [YT8511 Gigabit Ethernet] (mii_bus:phy_addr=stmmac-1:00, irq=POLL)
[   67.122270] dwmac4: Master AXI performs any burst length
[   67.122467] rk_gmac-dwmac fe010000.ethernet eth0: No Safety Features support found
[   67.122564] rk_gmac-dwmac fe010000.ethernet eth0: IEEE 1588-2008 Advanced Timestamp supported
[   67.123557] rk_gmac-dwmac fe010000.ethernet eth0: registered PTP clock
[root@RK356X:/sys/devices/platform/fe010000.ethernet]# [   70.163315] rk_gmac-dwmac fe010000.ethernet eth0: Link is Up - 1Gbps/Full - flow control rx/tx