Linux Mainline

[maal]

Unfortunately this does not work for me.

Code:

[root@cep03 ~]#  uname -a
Linux cep03 4.15.0-rc6 #2 SMP PREEMPT Sat Jan 6 18:45:37 UTC 2018 aarch64 aarch64 aarch64 GNU/Linux
[root@cep03 ~]# ip link show dev eth0
3: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP mode DEFAULT group default qlen 1000
   link/ether 66:ad:ab:e3:95:a8 brd ff:ff:ff:ff:ff:ff
[root@cep03 ~]# ethtool -S eth0 | grep err
    mmc_tx_underflow_error: 0
    mmc_tx_deferred: 0
    mmc_tx_carrier_error: 0
    mmc_rx_crc_error: 4
    mmc_rx_align_error: 0
    mmc_rx_run_error: 0
    mmc_rx_jabber_error: 0
    mmc_rx_length_error: 0
    mmc_rx_watchdog_error: 0
    mmc_rx_ipv4_hderr: 0
    mmc_rx_ipv4_hderr_octets: 0
    mmc_rx_ipv6_hderr_octets: 0
    mmc_rx_ipv6_hderr: 0
    mmc_rx_udp_err: 4
    mmc_rx_tcp_err: 0
    mmc_rx_icmp_err: 0
    mmc_rx_udp_err_octets: 224
    mmc_rx_tcp_err_octets: 0
    mmc_rx_icmp_err_octets: 0
    tx_deferred: 0
    tx_payload_error: 0
    tx_ip_header_error: 0
    overflow_error: 0
    ipc_csum_error: 0
    rx_crc_errors: 0
    fatal_bus_error_irq: 0
    phy_eee_wakeup_error_n: 0
    ip_hdr_err: 0
    ip_payload_err: 0
[root@cep03 ~]# ethtool -k eth0 | grep checksumming
Cannot get device udp-fragmentation-offload settings: Operation not supported
rx-checksumming: off
tx-checksumming: off
[root@cep03 ~]# ethtool -K eth0 rx off tx off                                                                                                                                      
Cannot get device udp-fragmentation-offload settings: Operation not supported
Cannot get device udp-fragmentation-offload settings: Operation not supported
[root@cep03 ~]# ethtool -k eth0 | grep checksumming
Cannot get device udp-fragmentation-offload settings: Operation not supported
rx-checksumming: off
tx-checksumming: off
[root@cep03 ~]# iperf3 -c 192.168.11.100 -R
Connecting to host 192.168.11.100, port 5201
Reverse mode, remote host 192.168.11.100 is sending
[  4] local 192.168.11.103 port 51274 connected to 192.168.11.100 port 5201
[ ID] Interval           Transfer     Bandwidth
[  4]   0.00-1.00   sec  22.6 KBytes   185 Kbits/sec                  
[  4]   1.00-2.00   sec  0.00 Bytes  0.00 bits/sec                  
[  4]   2.00-3.00   sec  0.00 Bytes  0.00 bits/sec                  
[  4]   3.00-4.00   sec  0.00 Bytes  0.00 bits/sec                  
[  4]   4.00-5.00   sec  0.00 Bytes  0.00 bits/sec                  
[  4]   5.00-6.00   sec  0.00 Bytes  0.00 bits/sec                  
[  4]   6.00-7.00   sec  0.00 Bytes  0.00 bits/sec                  
[  4]   7.00-8.00   sec  0.00 Bytes  0.00 bits/sec                  
[  4]   8.00-9.00   sec  0.00 Bytes  0.00 bits/sec                  
[  4]   9.00-10.00  sec  0.00 Bytes  0.00 bits/sec                  
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bandwidth       Retr
[  4]   0.00-10.00  sec   109 KBytes  89.2 Kbits/sec   18             sender
[  4]   0.00-10.00  sec  22.6 KBytes  18.5 Kbits/sec                  receiver

iperf Done.
[root@cep03 ~]# ethtool -S eth0 | grep err | grep -v ": 0"
    mmc_rx_crc_error: 33
    mmc_rx_udp_err: 4
    mmc_rx_tcp_err: 29
    mmc_rx_udp_err_octets: 224
    mmc_rx_tcp_err_octets: 42920
[root@cep03 ~]# ip link set eth0 down
[root@cep03 ~]# ip link set mtu 1200 dev eth0
[root@cep03 ~]# ip link set eth0 up
[  136.029978] RTL8211F Gigabit Ethernet stmmac-0:00: attached PHY driver [RTL8211F Gigabit Ethernet] (mii_bus:phy_addr=stmmac-0:00, irq=POLL)
[  136.044509] rk_gmac-dwmac ff540000.ethernet eth0: RX IPC Checksum Offload disabled
[  136.045250] rk_gmac-dwmac ff540000.ethernet eth0: PTP not supported by HW
[root@cep03 ~]# [  139.110570] rk_gmac-dwmac ff540000.ethernet eth0: Link is Up - 1Gbps/Full - flow control rx/tx

[root@cep03 ~]# ip link show dev eth0
3: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1200 qdisc mq state UP mode DEFAULT group default qlen 1000
   link/ether 66:ad:ab:e3:95:a8 brd ff:ff:ff:ff:ff:ff
[root@cep03 ~]# iperf3 -c 192.168.11.100 -R
Connecting to host 192.168.11.100, port 5201
Reverse mode, remote host 192.168.11.100 is sending
[  4] local 192.168.11.103 port 51278 connected to 192.168.11.100 port 5201
[ ID] Interval           Transfer     Bandwidth
[  4]   0.00-1.00   sec  14.6 KBytes   119 Kbits/sec                  
[  4]   1.00-2.00   sec  0.00 Bytes  0.00 bits/sec                  
[  4]   2.00-3.00   sec  0.00 Bytes  0.00 bits/sec                  
[  4]   3.00-4.00   sec  0.00 Bytes  0.00 bits/sec                  
[  4]   4.00-5.00   sec  0.00 Bytes  0.00 bits/sec                  
[  4]   5.00-6.00   sec  0.00 Bytes  0.00 bits/sec                  
[  4]   6.00-7.00   sec  0.00 Bytes  0.00 bits/sec                  
[  4]   7.00-8.00   sec  0.00 Bytes  0.00 bits/sec                  
[  4]   8.00-9.00   sec  0.00 Bytes  0.00 bits/sec                  
[  4]   9.00-10.00  sec  0.00 Bytes  0.00 bits/sec                  
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bandwidth       Retr
[  4]   0.00-10.00  sec  42.6 KBytes  34.9 Kbits/sec   29             sender
[  4]   0.00-10.00  sec  14.6 KBytes  11.9 Kbits/sec                  receiver

iperf Done.
[root@cep03 ~]# ethtool -S eth0 | grep err | grep -v ": 0"
    mmc_rx_crc_error: 33
    mmc_rx_tcp_err: 32
    mmc_rx_icmp_err: 1
    mmc_rx_tcp_err_octets: 38060
    mmc_rx_icmp_err_octets: 72
[root@cep03 ~]#

Would you please be so kind and show your results?