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authorMatteo Croce <mcroce@redhat.com>2018-12-01 01:23:05 +0100
committerAlexei Starovoitov <ast@kernel.org>2018-11-30 22:06:41 -0800
commitd606ee5c1d9a9bc4d1bba3c36fae615447f9851c (patch)
tree23e38205c206765e3920061f596c2e9bd241860f /samples
parent9ffd05d9b78a2fb393d31936886c320b1d6e438f (diff)
downloadlinux-stericsson-d606ee5c1d9a9bc4d1bba3c36fae615447f9851c.tar.gz
samples: bpf: improve xdp1 example
Store only the total packet count for every protocol, instead of the whole per-cpu array. Use bpf_map_get_next_key() to iterate the map, instead of looking up all the protocols. Signed-off-by: Matteo Croce <mcroce@redhat.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'samples')
-rw-r--r--samples/bpf/xdp1_user.c18
1 files changed, 8 insertions, 10 deletions
diff --git a/samples/bpf/xdp1_user.c b/samples/bpf/xdp1_user.c
index b02c531510ed..4f3d824fc044 100644
--- a/samples/bpf/xdp1_user.c
+++ b/samples/bpf/xdp1_user.c
@@ -34,26 +34,24 @@ static void int_exit(int sig)
static void poll_stats(int map_fd, int interval)
{
unsigned int nr_cpus = bpf_num_possible_cpus();
- const unsigned int nr_keys = 256;
- __u64 values[nr_cpus], prev[nr_keys][nr_cpus];
- __u32 key;
+ __u64 values[nr_cpus], prev[UINT8_MAX] = { 0 };
int i;
- memset(prev, 0, sizeof(prev));
-
while (1) {
+ __u32 key = UINT32_MAX;
+
sleep(interval);
- for (key = 0; key < nr_keys; key++) {
+ while (bpf_map_get_next_key(map_fd, &key, &key) != -1) {
__u64 sum = 0;
assert(bpf_map_lookup_elem(map_fd, &key, values) == 0);
for (i = 0; i < nr_cpus; i++)
- sum += (values[i] - prev[key][i]);
- if (sum)
+ sum += values[i];
+ if (sum > prev[key])
printf("proto %u: %10llu pkt/s\n",
- key, sum / interval);
- memcpy(prev[key], values, sizeof(values));
+ key, (sum - prev[key]) / interval);
+ prev[key] = sum;
}
}
}