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grspbr's avatar
grspbr
Icon for Occasional Contributor rankOccasional Contributor
3 years ago

MCDMA/PCIE max number of channels

Hi, The MCDMA/PCIE core has 11 bits of DMA channel address when using multiple logical channels on one physical interface. We planned to use 256 channels (physically) but probably only a dozen or so logical channels. However, when we try to drive it using Intel's DPDK, we seem to get corruption of the D2H DMA descriptors if we use more than 64 channels. Why are we seeing this limitation? Is it in the DPDK itself? Also, it seems we cannot use logical channels that we map to a physical channel address. I seems that the creation of channels automatically use sequential physical channel addresses starting from 0.

3 Replies

  • Wincent_Altera's avatar
    Wincent_Altera
    Icon for Regular Contributor rankRegular Contributor
    3 years ago

    Hi,


    Can I know which device and design example that you are using right now ?

    which Quartus version is it ?


    Regards,

    Wincent_Intel


  • Wincent_Altera's avatar
    Wincent_Altera
    Icon for Regular Contributor rankRegular Contributor
    3 years ago

    Hi,

    I wish to follow up with you about this case.

    Do you have any further questions on this matter ?

    ​​​​​​​Else I would like to have your permission to close this forum ticket

    Regards,

    Wincent_Intel


  • Wincent_Altera's avatar
    Wincent_Altera
    Icon for Regular Contributor rankRegular Contributor
    3 years ago

    Hi

    We have not hear from you and this Case is idling. It is not recommended to idle for too long.

    Therefore following our support policy, I have to put this case in close status. My apologies if any inconvenience cause

    Hence, This thread will be transitioned to community support.

    If you have a new question, feel free to open a new thread to get support from Intel experts.

    Otherwise, the community users will continue to help you on this thread. Thank you

    If you feel your support experience was less than a 9 or 10,

    please allow me to correct it before closing or let me know the cause so that I may improve your future support experience.

    Regards,

    Wincent_Intel