mac to mac connection,bandwidth 10Mbits/sec

[freescale-tomzh]

Hi,

   We are using two customized boards base on B4860. Now,we have a problem, we use "mac to mac connection" to realize the communication between the two boards.That is Fm1mac2=====backboard=====Fm1mac2.

   I change the device tree of fm1mac2 as follow:

   fm1mac2: ethernet@e2000 {
                phy-connection-type = "sgmii";
                fixed-link = <2 1 1000 0 0>;
    };

Now,two boards can communicate with each other, but the bandwidth can reach only 10Mbits/sec.

Do I need to change anything else?   thanks

[yipingwang]

Hello tom paul,

It seems that the dts file makes sense.

 A 'fixed-link' property in the Ethernet MAC node, with 5 cells, of the form <a b c d e> with the following accepted values:
  - a: emulated PHY ID, choose any but but unique to the all specified fixed-links, from 0 to 31
  - b: duplex configuration: 0 for half duplex, 1 for full duplex
  - c: link speed in Mbits/sec, accepted values are: 10, 100 and 1000
  - d: pause configuration: 0 for no pause, 1 for pause
  - e: asymmetric pause configuration: 0 for no asymmetric pause, 1 for asymmetric pause

Please use "ethtool" to check the status of this Ethernet port.

Which version Linux SDK do you use?

Have a great day,
TIC

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[freescale-tomzh]

Hello Yiping Wang,

The version of Linux SDK we use is SDK1.6;

When I use ethtool to check the status of fm1-mac2, the result is:

#ethtool fm1-mac2
Settings for fm1-mac2:
        Supported ports: [ MII ]
        Supported link modes:   1000baseT/Full
        Supported pause frame use: Symmetric Receive-only
        Supports auto-negotiation: Yes
        Advertised link modes:  1000baseT/Full
        Advertised pause frame use: Symmetric Receive-only
        Advertised auto-negotiation: Yes
        Speed: 1000Mb/s
        Duplex: Full
        Port: MII
        PHYAD: 2
        Transceiver: external
        Auto-negotiation: on
        Current message level: 0xffffffff (-1)
                               drv probe link timer ifdown ifup rx_err tx_err tx_queued intr tx_done rx_status pktdata hw wol 0xffff8000
        Link detected: yes

There seems to be no problem, but when  I test the bandwidth use iperf,it is still 10Mbits/sec.

[yipingwang · Accepted solution]

Hello tom paul,

Please check whether the attached patch has already been applied to your Kernel source.

If no, please apply it to check whether it would be helpful.

Have a great day,
TIC

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[freescale-tomzh]

Hi,YiPing Wang:

     Thank you for your help, I have resolved the problem after adding the patch to the Kernel source!