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| author | Kumar Kartikeya Dwivedi <memxor@gmail.com> | 2021-08-21 05:49:54 +0530 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2021-08-24 14:48:40 -0700 |
| commit | 451588764e2f3e3ab197b23c7958f750707e2a24 (patch) | |
| tree | 11c70ba9f2093a55625d8d6b30329c0a2c67c6c1 /samples/bpf | |
| parent | 1d930fd2cdbf5e156c32c73ea7f3d5b12bdc41d7 (diff) | |
| download | lwn-451588764e2f3e3ab197b23c7958f750707e2a24.tar.gz lwn-451588764e2f3e3ab197b23c7958f750707e2a24.zip | |
samples: bpf: Add BPF support for xdp_exception tracepoint
This would allow us to store stats for each XDP action, including their
per-CPU counts. Consolidating this here allows all redirect samples to
detect xdp_exception events.
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20210821002010.845777-7-memxor@gmail.com
Diffstat (limited to 'samples/bpf')
| -rw-r--r-- | samples/bpf/xdp_sample.bpf.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/samples/bpf/xdp_sample.bpf.c b/samples/bpf/xdp_sample.bpf.c index e22f2a97a988..53ab5a972405 100644 --- a/samples/bpf/xdp_sample.bpf.c +++ b/samples/bpf/xdp_sample.bpf.c @@ -8,6 +8,7 @@ array_map rx_cnt SEC(".maps"); array_map redir_err_cnt SEC(".maps"); +array_map exception_cnt SEC(".maps"); const volatile int nr_cpus = 0; @@ -110,3 +111,29 @@ int BPF_PROG(tp_xdp_redirect_map, const struct net_device *dev, { return xdp_redirect_collect_stat(dev->ifindex, err); } + +SEC("tp_btf/xdp_exception") +int BPF_PROG(tp_xdp_exception, const struct net_device *dev, + const struct bpf_prog *xdp, u32 act) +{ + u32 cpu = bpf_get_smp_processor_id(); + struct datarec *rec; + u32 key = act, idx; + + if (!IN_SET(from_match, dev->ifindex)) + return 0; + if (!IN_SET(to_match, dev->ifindex)) + return 0; + + if (key > XDP_REDIRECT) + key = XDP_REDIRECT + 1; + + idx = key * nr_cpus + cpu; + rec = bpf_map_lookup_elem(&exception_cnt, &idx); + if (!rec) + return 0; + NO_TEAR_INC(rec->dropped); + + return 0; +} + |