• Alexei Starovoitov's avatar
    bpf: introduce BPF_PROG_TEST_RUN command · 1cf1cae9
    Alexei Starovoitov authored
    development and testing of networking bpf programs is quite cumbersome.
    Despite availability of user space bpf interpreters the kernel is
    the ultimate authority and execution environment.
    Current test frameworks for TC include creation of netns, veth,
    qdiscs and use of various packet generators just to test functionality
    of a bpf program. XDP testing is even more complicated, since
    qemu needs to be started with gro/gso disabled and precise queue
    configuration, transferring of xdp program from host into guest,
    attaching to virtio/eth0 and generating traffic from the host
    while capturing the results from the guest.
    
    Moreover analyzing performance bottlenecks in XDP program is
    impossible in virtio environment, since cost of running the program
    is tiny comparing to the overhead of virtio packet processing,
    so performance testing can only be done on physical nic
    with another server generating traffic.
    
    Furthermore ongoing changes to user space control plane of production
    applications cannot be run on the test servers leaving bpf programs
    stubbed out for testing.
    
    Last but not least, the upstream llvm changes are validated by the bpf
    backend testsuite which has no ability to test the code generated.
    
    To improve this situation introduce BPF_PROG_TEST_RUN command
    to test and performance benchmark bpf programs.
    
    Joint work with Daniel Borkmann.
    Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
    Acked-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
    Acked-by: default avatarMartin KaFai Lau <kafai@fb.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    1cf1cae9