From f74599f7c5309b21151233b98139e9b723fd1110 Mon Sep 17 00:00:00 2001 From: Thomas Graf Date: Wed, 30 Nov 2016 17:10:11 +0100 Subject: bpf: Add tests and samples for LWT-BPF Adds a series of tests to verify the functionality of attaching BPF programs at LWT hooks. Also adds a sample which collects a histogram of packet sizes which pass through an LWT hook. $ ./lwt_len_hist.sh Starting netserver with host 'IN(6)ADDR_ANY' port '12865' and family AF_UNSPEC MIGRATED TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.253.2 () port 0 AF_INET : demo Recv Send Send Socket Socket Message Elapsed Size Size Size Time Throughput bytes bytes bytes secs. 10^6bits/sec 87380 16384 16384 10.00 39857.69 1 -> 1 : 0 | | 2 -> 3 : 0 | | 4 -> 7 : 0 | | 8 -> 15 : 0 | | 16 -> 31 : 0 | | 32 -> 63 : 22 | | 64 -> 127 : 98 | | 128 -> 255 : 213 | | 256 -> 511 : 1444251 |******** | 512 -> 1023 : 660610 |*** | 1024 -> 2047 : 535241 |** | 2048 -> 4095 : 19 | | 4096 -> 8191 : 180 | | 8192 -> 16383 : 5578023 |************************************* | 16384 -> 32767 : 632099 |*** | 32768 -> 65535 : 6575 | | Signed-off-by: Thomas Graf Acked-by: Alexei Starovoitov Signed-off-by: David S. Miller --- samples/bpf/lwt_len_hist_user.c | 76 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 76 insertions(+) create mode 100644 samples/bpf/lwt_len_hist_user.c (limited to 'samples/bpf/lwt_len_hist_user.c') diff --git a/samples/bpf/lwt_len_hist_user.c b/samples/bpf/lwt_len_hist_user.c new file mode 100644 index 000000000000..05d783fc5daf --- /dev/null +++ b/samples/bpf/lwt_len_hist_user.c @@ -0,0 +1,76 @@ +#include +#include + +#include +#include +#include +#include +#include +#include + +#include "libbpf.h" +#include "bpf_util.h" + +#define MAX_INDEX 64 +#define MAX_STARS 38 + +static void stars(char *str, long val, long max, int width) +{ + int i; + + for (i = 0; i < (width * val / max) - 1 && i < width - 1; i++) + str[i] = '*'; + if (val > max) + str[i - 1] = '+'; + str[i] = '\0'; +} + +int main(int argc, char **argv) +{ + unsigned int nr_cpus = bpf_num_possible_cpus(); + const char *map_filename = "/sys/fs/bpf/tc/globals/lwt_len_hist_map"; + uint64_t values[nr_cpus], sum, max_value = 0, data[MAX_INDEX] = {}; + uint64_t key = 0, next_key, max_key = 0; + char starstr[MAX_STARS]; + int i, map_fd; + + map_fd = bpf_obj_get(map_filename); + if (map_fd < 0) { + fprintf(stderr, "bpf_obj_get(%s): %s(%d)\n", + map_filename, strerror(errno), errno); + return -1; + } + + while (bpf_get_next_key(map_fd, &key, &next_key) == 0) { + if (next_key >= MAX_INDEX) { + fprintf(stderr, "Key %lu out of bounds\n", next_key); + continue; + } + + bpf_lookup_elem(map_fd, &next_key, values); + + sum = 0; + for (i = 0; i < nr_cpus; i++) + sum += values[i]; + + data[next_key] = sum; + if (sum && next_key > max_key) + max_key = next_key; + + if (sum > max_value) + max_value = sum; + + key = next_key; + } + + for (i = 1; i <= max_key + 1; i++) { + stars(starstr, data[i - 1], max_value, MAX_STARS); + printf("%8ld -> %-8ld : %-8ld |%-*s|\n", + (1l << i) >> 1, (1l << i) - 1, data[i - 1], + MAX_STARS, starstr); + } + + close(map_fd); + + return 0; +} -- cgit v1.2.3-55-g7522