Eric Lee / smarc-fsl-linux-kernel

21 Jan, 2020

1 commit

  • 7cf245a37   samples/bpf: Use consistent include paths for libbpf ... Browse Code »

    Fix all files in samples/bpf to include libbpf header files with the bpf/
    prefix, to be consistent with external users of the library. Also ensure
    that all includes of exported libbpf header files (those that are exported
    on 'make install' of the library) use bracketed includes instead of quoted.

    To make sure no new files are introduced that doesn't include the bpf/
    prefix in its include, remove tools/lib/bpf from the include path entirely,
    and use tools/lib instead.

    Fixes: 6910d7d3867a ("selftests/bpf: Ensure bpf_helper_defs.h are taken from selftests dir")
    Signed-off-by: Toke Høiland-Jørgensen
    Signed-off-by: Alexei Starovoitov
    Acked-by: Jesper Dangaard Brouer
    Acked-by: Andrii Nakryiko
    Link: https://lore.kernel.org/bpf/157952560911.1683545.8795966751309534150.stgit@toke.dk

    Toke Høiland-Jørgensen
     

18 Jan, 2018

1 commit

11 Jan, 2018

1 commit

  • 36e04a2d7   samples/bpf: xdp2skb_meta shows transferring info from XDP to SKB ... Browse Code »

    Creating a bpf sample that shows howto use the XDP 'data_meta'
    infrastructure, created by Daniel Borkmann. Very few drivers support
    this feature, but I wanted a functional sample to begin with, when
    working on adding driver support.

    XDP data_meta is about creating a communication channel between BPF
    programs. This can be XDP tail-progs, but also other SKB based BPF
    hooks, like in this case the TC clsact hook. In this sample I show
    that XDP can store info named "mark", and TC/clsact chooses to use
    this info and store it into the skb->mark.

    It is a bit annoying that XDP and TC samples uses different tools/libs
    when attaching their BPF hooks. As the XDP and TC programs need to
    cooperate and agree on a struct-layout, it is best/easiest if the two
    programs can be contained within the same BPF restricted-C file.

    As the bpf-loader, I choose to not use bpf_load.c (or libbpf), but
    instead wrote a bash shell scripted named xdp2skb_meta.sh, which
    demonstrate howto use the iproute cmdline tools 'tc' and 'ip' for
    loading BPF programs. To make it easy for first time users, the shell
    script have command line parsing, and support --verbose and --dry-run
    mode, if you just want to see/learn the tc+ip command syntax:

    # ./xdp2skb_meta.sh --dev ixgbe2 --dry-run
    # Dry-run mode: enable VERBOSE and don't call TC+IP
    tc qdisc del dev ixgbe2 clsact
    tc qdisc add dev ixgbe2 clsact
    tc filter add dev ixgbe2 ingress prio 1 handle 1 bpf da obj ./xdp2skb_meta_kern.o sec tc_mark
    # Flush XDP on device: ixgbe2
    ip link set dev ixgbe2 xdp off
    ip link set dev ixgbe2 xdp obj ./xdp2skb_meta_kern.o sec xdp_mark

    Signed-off-by: Jesper Dangaard Brouer
    Signed-off-by: Daniel Borkmann

    Jesper Dangaard Brouer