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.
Possible solution for libvirt may look like this: https://github.com/daynix/libvirt/tree/RSS_eBPF (WIP) Andrew Melnychenko (5): 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: Updated eBPF program and skeleton. ebpf/ebpf.c | 54 ++ ebpf/ebpf.h | 31 + ebpf/ebpf_rss-stub.c | 6 + ebpf/ebpf_rss.c | 124 ++- ebpf/ebpf_rss.h | 10 + ebpf/meson.build | 1 + ebpf/rss.bpf.skeleton.h | 1469 ++++++++++++++++---------------- hw/net/virtio-net.c | 96 ++- include/hw/virtio/virtio-net.h | 1 + monitor/qmp-cmds.c | 16 + qapi/misc.json | 28 + tools/ebpf/rss.bpf.c | 2 +- 12 files changed, 1079 insertions(+), 759 deletions(-) create mode 100644 ebpf/ebpf.c create mode 100644 ebpf/ebpf.h -- 2.39.1
