Re: [RFC PATCH 0/4] eBPF RSS through QMP support.

[Jason Wang]

On Thu, Mar 30, 2023 at 8:33 AM Andrew Melnychenko <andrew@daynix.com> wrote:
>
> This series of patches provides the ability to retrieve eBPF program
> through qmp, so management application may load bpf blob with proper 
> capabilities.
> Now, virtio-net devices can accept eBPF programs and maps through properties
> as external file descriptors. Access to the eBPF map is direct through mmap()
> call, so it should not require additional capabilities to bpf* calls.
> eBPF file descriptors can be passed to QEMU from parent process or by unix
> socket with sendfd() qmp command.
>
> Overall, the basic scenario of using the helper looks like this:
>  * Libvirt checks for ebpf_fds property.
>  * Libvirt requests eBPF blob through QMP.
>  * Libvirt loads blob for virtio-net.
>  * Libvirt launches the QEMU with eBPF fds passed.

Is there a libvirt side draft that can be used as a reference?

Thanks

>
> Andrew Melnychenko (4):
>   ebpf: Added eBPF initialization by fds and map update.
>   virtio-net: Added property to load eBPF RSS with fds.
>   ebpf: Added declaration/initialization routines.
>   qmp: Added new command to retrieve eBPF blob.
>
>  ebpf/ebpf.c                    |  48 +++++++++++++
>  ebpf/ebpf.h                    |  25 +++++++
>  ebpf/ebpf_rss-stub.c           |   6 ++
>  ebpf/ebpf_rss.c                | 124 +++++++++++++++++++++++++++------
>  ebpf/ebpf_rss.h                |  10 +++
>  ebpf/meson.build               |   1 +
>  hw/net/virtio-net.c            |  77 ++++++++++++++++++--
>  include/hw/virtio/virtio-net.h |   1 +
>  monitor/qmp-cmds.c             |  17 +++++
>  qapi/misc.json                 |  25 +++++++
>  10 files changed, 307 insertions(+), 27 deletions(-)
>  create mode 100644 ebpf/ebpf.c
>  create mode 100644 ebpf/ebpf.h
>
> --
> 2.39.1
>