Re: AF_XDP and dma

On Fri, Apr 9, 2021 at 3:50 PM Magnus Karlsson
<[email protected]> wrote:
> Then looking at user-space code will not help you :-). Take a look at
> the code in driver/net/ethernet/intel/i40e/i40e_xsk.c in the Linux
> kernel for an example on how to DMA map the umem.

Thanks, i could see that it is pinning the pages and mapping.

Using Kernel DMA api, we can map the virtual memory. But how the NIC
can write/read to the memory if it is not physically contiguous. NIC
card only understand physical addresses. Correct me.

> > > > > /Magnus