Note: This RFC has been sent to netdev as well as qemu-devel lists This patchset implements XDP offload feature in qemu. The successful operation of this feature depends on availability of XDP offload feature in guest, qemu and host. When this feature isn't available in qemu or host, the request from guest to offload an XDP program should fail. Patch 1/3 adds support for libbpf in configure script. Patch 2/2 enables offloading of ebpf program. Patch 3/3 enabled offloading of ebpf map. Points for improvement (TODO): - In future virtio can have feature bit for offloading capability - TUNGETFEATURES should have a flag to notify about offloading capability - Submit virtio spec patch to describe XDP offloading feature - DoS: Offloaded map uses host's memory which is other than what has been allocated for the guest. Offloading many maps of large size can be one of the DoS strategy. Hence qemu should have parameter to limit how many maps guest can offload or how much memory offloaded maps use. Note: This set directly modifies virtio_net.h header instead of importing it from existing kernel headers because relevant changes aren't present in kernel repository yet. Hence changes to virtio_net.h are for RFC purpose only. Jason Wang (2): virtio-net: add support for offloading XDP program virtio-net: add support for offloading an ebpf map Prashant Bhole (1): configure: add libbpf support configure | 23 +++ hw/net/Makefile.objs | 2 + hw/net/virtio-net.c | 157 ++++++++++++++++++++ include/net/tap.h | 2 + include/standard-headers/linux/virtio_net.h | 50 +++++++ net/Makefile.objs | 1 + net/tap-bsd.c | 5 + net/tap-linux.c | 48 ++++++ net/tap-linux.h | 1 + net/tap-solaris.c | 5 + net/tap-stub.c | 5 + net/tap.c | 7 + net/tap_int.h | 1 + 13 files changed, 307 insertions(+) -- 2.20.1
