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Original question:

TDA4VM: Does TDA4VM support jumbo frame?

AM68: Does TDA4VM support jumbo frame

Roman Milishchuk
Intellectual 270 points
Part Number: AM68


I've seen a question that 3 years old: https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1182410/tda4vm-does-tda4vm-support-jumbo-frame?tisearch=e2e-sitesearch&keymatch=TDA4VM%252520Processor%252520%252520SIOCSIFMTU%25253A%252520Invalid%252520argument%252522%252520for%252520values%252520above%2525201500, that jumbo frames are not supported due to cpsw. 

Could you update whether it's still true ?

Best,
Roman

  • 0
    TI__Guru** 116710 points

    Roman,

    This is internal H/W FIFO size of Ethernet Ports is limitation so can't support Jumbo frames. Please check the TRM where it mentions that the maximum frame size possible is 2020 bytes. So cpsw doesn't support jumbo frames. I have looped in networking expert to indicate if there is any SW mechanism to handle jumbo packets.

    thanks and Regards,

    Rahul 

  • 0 in reply to Rahul Prabhu
    TI__Mastermind 40290 points

    Hi Roman,

    The L3 and above applications can still work with jumbo frames as linux has mechanisms to fragment the packets and combine the packets from software in its network stack. This is something which is dependent on configuration of both sides of communication. The out-of-box PSDK linux supports it. This is not available in PSDK RTOS.

    But ultimately, its not possible to send jumbo frames on wire from CPSW hardware.

    Regards,
    Tanmay

  • 0 in reply to Tanmay Patil
    Intellectual 270 points

    Currently, I am working RealSense d555 camera, and it can only send jumbo frames, and we cannot reconfigure it. Could you advise how we can configure the Linux interface to receive the data?

    Thankfully,
    Roman 

  • +1 in reply to Roman Milishchuk
    TI__Mastermind 40290 points

    Hi Roman,

    Roman Milishchuk said:
    it can only send jumbo frames, and we cannot reconfigure it. Could you advise how we can configure the Linux interface to receive the data?

    If its not possible to send fragmented frames from the camera, it isn't possible to receive those on switch. The hardware cannot receive packets more that 2020 bytes.

    Regards,
    Tanmay