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Diffstat (limited to 'tools/testing/selftests/bpf/netcnt_prog.c')
-rw-r--r--tools/testing/selftests/bpf/netcnt_prog.c71
1 files changed, 71 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/netcnt_prog.c b/tools/testing/selftests/bpf/netcnt_prog.c
new file mode 100644
index 000000000000..1198abca1360
--- /dev/null
+++ b/tools/testing/selftests/bpf/netcnt_prog.c
@@ -0,0 +1,71 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/bpf.h>
+#include <linux/version.h>
+
+#include "bpf_helpers.h"
+#include "netcnt_common.h"
+
+#define MAX_BPS (3 * 1024 * 1024)
+
+#define REFRESH_TIME_NS 100000000
+#define NS_PER_SEC 1000000000
+
+struct bpf_map_def SEC("maps") percpu_netcnt = {
+ .type = BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE,
+ .key_size = sizeof(struct bpf_cgroup_storage_key),
+ .value_size = sizeof(struct percpu_net_cnt),
+};
+
+struct bpf_map_def SEC("maps") netcnt = {
+ .type = BPF_MAP_TYPE_CGROUP_STORAGE,
+ .key_size = sizeof(struct bpf_cgroup_storage_key),
+ .value_size = sizeof(struct net_cnt),
+};
+
+SEC("cgroup/skb")
+int bpf_nextcnt(struct __sk_buff *skb)
+{
+ struct percpu_net_cnt *percpu_cnt;
+ char fmt[] = "%d %llu %llu\n";
+ struct net_cnt *cnt;
+ __u64 ts, dt;
+ int ret;
+
+ cnt = bpf_get_local_storage(&netcnt, 0);
+ percpu_cnt = bpf_get_local_storage(&percpu_netcnt, 0);
+
+ percpu_cnt->packets++;
+ percpu_cnt->bytes += skb->len;
+
+ if (percpu_cnt->packets > MAX_PERCPU_PACKETS) {
+ __sync_fetch_and_add(&cnt->packets,
+ percpu_cnt->packets);
+ percpu_cnt->packets = 0;
+
+ __sync_fetch_and_add(&cnt->bytes,
+ percpu_cnt->bytes);
+ percpu_cnt->bytes = 0;
+ }
+
+ ts = bpf_ktime_get_ns();
+ dt = ts - percpu_cnt->prev_ts;
+
+ dt *= MAX_BPS;
+ dt /= NS_PER_SEC;
+
+ if (cnt->bytes + percpu_cnt->bytes - percpu_cnt->prev_bytes < dt)
+ ret = 1;
+ else
+ ret = 0;
+
+ if (dt > REFRESH_TIME_NS) {
+ percpu_cnt->prev_ts = ts;
+ percpu_cnt->prev_packets = cnt->packets;
+ percpu_cnt->prev_bytes = cnt->bytes;
+ }
+
+ return !!ret;
+}
+
+char _license[] SEC("license") = "GPL";
+__u32 _version SEC("version") = LINUX_VERSION_CODE;