From: Jakub Kicinski <kuba@xxxxxxxxxx>
Date: Tue, 27 May 2025 19:03:09 -0700
> On Tue, 20 May 2025 13:59:04 -0700 Tony Nguyen wrote:
>> + if (sinfo || !netmem_is_net_iov(netmem)) {
>> + const struct page_pool *pp = __netmem_get_pp(netmem);
>> +
>> + dma_sync_single_for_device(pp->p.dev, desc.addr, desc.len,
>> + DMA_BIDIRECTIONAL);
>> + }
>
> How can we get an unreadable netmem into the XDP Tx path?
For now, it's not allowed. This is future proof. I have plans to allow
XDP and devmem to co-exist when the XDP program doesn't want to access
frags, only headers. In that case, why forbid?
Thanks,
Olek
