Ethernet error when testing sending using iperf3

[jiez]

Running iperf3 on the board to test sending data, I got this error

[  5] 2590.01-2600.01 sec  1.10 GBytes   941 Mbits/sec    0   1.24 MBytes                                               
[  5] 2600.01-2610.01 sec  1.10 GBytes   941 Mbits/sec    0   1.24 MBytes                                               
[  5] 2610.01-2620.01 sec  1.10 GBytes   942 Mbits/sec    6    888 KBytes                                               
[  5] 2620.01-2630.01 sec  1.10 GBytes   942 Mbits/sec    0    888 KBytes                                               
[ 2792.074526] adi-dwmac 31040000.ethernet eth0: NETDEV WATCHDOG: CPU: 0: transmit queue 0 timed out 5176 ms            
[ 2792.084364] adi-dwmac 31040000.ethernet eth0: Reset adapter.                                                         
[  5] 2630.01-2640.00 sec   492 MBytes   413 Mbits/sec    1   1.41 KBytes                                               
[ 2792.593871] adi-dwmac 31040000.ethernet eth0: Timeout accessing MAC_VLAN_Tag_Filter                                  
[ 2792.601437] adi-dwmac 31040000.ethernet eth0: failed to kill vid 0081/0                                              
[ 2792.608631] adi-dwmac 31040000.ethernet eth0: Register MEM_TYPE_PAGE_POOL RxQ-0                                      
[ 2792.618293] adi-dwmac 31040000.ethernet eth0: PHY [stmmac-0:00] driver [Generic PHY] (irq=POLL)                      
[ 2792.637251] adi-dwmac 31040000.ethernet eth0: No Safety Features support found                                       
[ 2792.644333] adi-dwmac 31040000.ethernet eth0: IEEE 1588-2008 Advanced Timestamp supported                            
[ 2792.653201] adi-dwmac 31040000.ethernet eth0: registered PTP clock                                                   
[ 2792.659290] adi-dwmac 31040000.ethernet eth0: configuring for phy/rgmii-id link mode                                 
[ 2792.667626] 8021q: adding VLAN 0 to HW filter on device eth0                                                         
[ 2796.747257] adi-dwmac 31040000.ethernet eth0: Link is Up - 1Gbps/Full - flow control off                             
[  5] 2640.00-2650.01 sec   567 MBytes   475 Mbits/sec  278    650 KBytes                                               
[  5] 2650.01-2660.01 sec  1.10 GBytes   941 Mbits/sec    0    650 KBytes                                               
[  5] 2650.01-2660.01 sec  1.10 GBytes   941 Mbits/sec    0    650 KBytes