Re: [PATCH net-next 00/11] net: devmem: support devmem with netkit devices

Daniel Borkmann
2026-04-29T12:08:45Z

Hi Bobby,

On 4/29/26 12:41 AM, Bobby Eshleman wrote:
> This series enables TCP devmem TX through netkit devices.
>
> Netkit now supports queue leasing. A physical NIC's RX queue can be
> leased to a netkit guest interface inside a container namespace. This
> gives the container a devmem-capable data path on the RX side (bind-rx,
> etc...). On the TX side, the container process binds to its netkit guest
> interface and sends traffic that netkit redirects (via BPF or ip
> forwarding) to the physical NIC for DMA.
[...]
Thanks for working on this, after the RX queue leasing got merged, I've
been looking into the same actually. :)

I think the NETMEM_TX_* enum approach seems reasonable.

What I have a PoC on is to build out TX queue leasing as first-class
symmetric infrastructure to complement the RX queue leasing - basically
I implemented an equivalent to the latter in netdev_nl_queue_create_doit
et al, so you can have independent RX and TX leases and per-queue
accountability, such that ynl queue-get op shows the full picture, and
lastly we could also enable AF_XDP TX-only support through this infra.

Would you be open to collab on integrating both and migrating the devmem
code to work off an TX queue object? Next week is LSF/MM/BPF, are you
there by any chance to catch up in person?

Thanks a lot,
Daniel