[PATCH bpf-next v4 06/22] samples: bpf: Add BPF support for xdp_exception tracepoint
STALE1868d
LANDED
From: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Date: 2021-08-21 00:20:41
Also in:
netdev
Subsystem:
bpf [general] (safe dynamic programs and tools), the rest, xdp (express data path) · Maintainers:
Alexei Starovoitov, Daniel Borkmann, Andrii Nakryiko, Eduard Zingerman, Kumar Kartikeya Dwivedi, Linus Torvalds, David S. Miller, Jakub Kicinski, Jesper Dangaard Brouer, John Fastabend
Revision v4 of 4 in this series; landed in mainline as 451588764e2f on 2021-08-24.
Revisions (4)
- rfc [diff vs current]
- v2 [diff vs current]
- v3 [diff vs current]
- v4 current
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> --- samples/bpf/xdp_sample.bpf.c | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+)
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; +} +
--
2.33.0