On Sat, Dec 11, 2021 at 10:43 AM Toke Høiland-Jørgensen <toke@xxxxxxxxxx> wrote: > > This adds an XDP-based traffic generator sample which uses the DO_REDIRECT > flag of bpf_prog_run(). It works by building the initial packet in > userspace and passing it to the kernel where an XDP program redirects the > packet to the target interface. The traffic generator supports two modes of > operation: one that just sends copies of the same packet as fast as it can > without touching the packet data at all, and one that rewrites the > destination port number of each packet, making the generated traffic span a > range of port numbers. > > The dynamic mode is included to demonstrate how the bpf_prog_run() facility > enables building a completely programmable packet generator using XDP. > Using the dynamic mode has about a 10% overhead compared to the static > mode, because the latter completely avoids touching the page data. > > Signed-off-by: Toke Høiland-Jørgensen <toke@xxxxxxxxxx> > --- > samples/bpf/.gitignore | 1 + > samples/bpf/Makefile | 4 + > samples/bpf/xdp_redirect.bpf.c | 34 +++ > samples/bpf/xdp_trafficgen_user.c | 421 ++++++++++++++++++++++++++++++ > 4 files changed, 460 insertions(+) > create mode 100644 samples/bpf/xdp_trafficgen_user.c I think it deserves to be in tools/bpf/ samples/bpf/ bit rots too often now. imo everything in there either needs to be converted to selftests/bpf or deleted.
