summaryrefslogtreecommitdiff
path: root/samples/bpf/xdp_monitor_kern.c
diff options
context:
space:
mode:
authorJesper Dangaard Brouer <brouer@redhat.com>2018-05-24 17:46:02 +0300
committerAlexei Starovoitov <ast@kernel.org>2018-05-25 04:36:15 +0300
commit9940fbf633e8714c7c885f8d3848f508b8612069 (patch)
treea8965f6a19f1ef4cc4b4bea7bd17212256093411 /samples/bpf/xdp_monitor_kern.c
parent38edddb81172e8b8decb057c0cd23271583a5fa0 (diff)
downloadlinux-9940fbf633e8714c7c885f8d3848f508b8612069.tar.xz
samples/bpf: xdp_monitor use tracepoint xdp:xdp_devmap_xmit
The xdp_monitor sample/tool is updated to use the new tracepoint xdp:xdp_devmap_xmit the previous patch just introduced. Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'samples/bpf/xdp_monitor_kern.c')
-rw-r--r--samples/bpf/xdp_monitor_kern.c39
1 files changed, 39 insertions, 0 deletions
diff --git a/samples/bpf/xdp_monitor_kern.c b/samples/bpf/xdp_monitor_kern.c
index 211db8ded0de..2854aa0665ea 100644
--- a/samples/bpf/xdp_monitor_kern.c
+++ b/samples/bpf/xdp_monitor_kern.c
@@ -208,3 +208,42 @@ int trace_xdp_cpumap_kthread(struct cpumap_kthread_ctx *ctx)
return 0;
}
+
+struct bpf_map_def SEC("maps") devmap_xmit_cnt = {
+ .type = BPF_MAP_TYPE_PERCPU_ARRAY,
+ .key_size = sizeof(u32),
+ .value_size = sizeof(struct datarec),
+ .max_entries = 1,
+};
+
+/* Tracepoint: /sys/kernel/debug/tracing/events/xdp/xdp_devmap_xmit/format
+ * Code in: kernel/include/trace/events/xdp.h
+ */
+struct devmap_xmit_ctx {
+ u64 __pad; // First 8 bytes are not accessible by bpf code
+ int map_id; // offset:8; size:4; signed:1;
+ u32 act; // offset:12; size:4; signed:0;
+ u32 map_index; // offset:16; size:4; signed:0;
+ int drops; // offset:20; size:4; signed:1;
+ int sent; // offset:24; size:4; signed:1;
+ int from_ifindex; // offset:28; size:4; signed:1;
+ int to_ifindex; // offset:32; size:4; signed:1;
+};
+
+SEC("tracepoint/xdp/xdp_devmap_xmit")
+int trace_xdp_devmap_xmit(struct devmap_xmit_ctx *ctx)
+{
+ struct datarec *rec;
+ u32 key = 0;
+
+ rec = bpf_map_lookup_elem(&devmap_xmit_cnt, &key);
+ if (!rec)
+ return 0;
+ rec->processed += ctx->sent;
+ rec->dropped += ctx->drops;
+
+ /* Record bulk events, then userspace can calc average bulk size */
+ rec->info += 1;
+
+ return 1;
+}