linux-kernel - [RFC PATCH 0/4] eBPF RSS through QMP support.

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Date:   Wed, 29 Mar 2023 13:45:41 +0300
From:   Andrew Melnychenko <andrew@...nix.com>
To:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, mst@...hat.com, jasowang@...hat.com,
        yoshfuji@...ux-ipv6.org, dsahern@...nel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org
Cc:     yan@...nix.com, yuri.benditovich@...nix.com
Subject: [RFC PATCH 0/4] eBPF RSS through QMP support.

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.

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