> XDP does not allow jumbo frames due to the requirement of frameSize < pageSize. > > I'm also aware of the ongoing work related to scatter-gather > (multi-buffers) to support jumbo frames with XDP. > > I'm wondering if jumbo frames can be more simply supported by using > AF_XDP with huge pages (instead of multi-buffers)? If so, are jumbo > frames supported in both Rx and Tx directions? I assume this support > is likely driver specific? I understand the multi-buffer requirement for the general eBPF/XDP case to support jumbo frames. However, for AF_XDP if the UMEM is composed of Huge pages with frame size set to 8K or 16K and unaligned chunk flag enabled, the AF_XDP rings (RX/TX) and the NIC rings (RX/TX) should all have buffer sizes big enough for jumbo frames and direct access should work because it's all contiguous memory. I don't see a need for multi-buffers for the AF_XDP use case. What am I missing? * Is this use case a snowflake? * Are there limitations in the ethernet drivers wrt to huge pages or frame size limits? Srivats
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