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77 lines
1.6 KiB
77 lines
1.6 KiB
// SPDX-License-Identifier: GPL-2.0 |
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#include <linux/unistd.h> |
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#include <linux/bpf.h> |
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#include <stdlib.h> |
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#include <stdio.h> |
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#include <unistd.h> |
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#include <string.h> |
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#include <errno.h> |
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#include <arpa/inet.h> |
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#include <bpf/bpf.h> |
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#include "bpf_util.h" |
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#define MAX_INDEX 64 |
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#define MAX_STARS 38 |
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static void stars(char *str, long val, long max, int width) |
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{ |
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int i; |
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for (i = 0; i < (width * val / max) - 1 && i < width - 1; i++) |
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str[i] = '*'; |
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if (val > max) |
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str[i - 1] = '+'; |
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str[i] = '\0'; |
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} |
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int main(int argc, char **argv) |
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{ |
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unsigned int nr_cpus = bpf_num_possible_cpus(); |
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const char *map_filename = "/sys/fs/bpf/tc/globals/lwt_len_hist_map"; |
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uint64_t values[nr_cpus], sum, max_value = 0, data[MAX_INDEX] = {}; |
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uint64_t key = 0, next_key, max_key = 0; |
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char starstr[MAX_STARS]; |
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int i, map_fd; |
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map_fd = bpf_obj_get(map_filename); |
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if (map_fd < 0) { |
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fprintf(stderr, "bpf_obj_get(%s): %s(%d)\n", |
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map_filename, strerror(errno), errno); |
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return -1; |
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} |
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while (bpf_map_get_next_key(map_fd, &key, &next_key) == 0) { |
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if (next_key >= MAX_INDEX) { |
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fprintf(stderr, "Key %lu out of bounds\n", next_key); |
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continue; |
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} |
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bpf_map_lookup_elem(map_fd, &next_key, values); |
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sum = 0; |
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for (i = 0; i < nr_cpus; i++) |
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sum += values[i]; |
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data[next_key] = sum; |
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if (sum && next_key > max_key) |
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max_key = next_key; |
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if (sum > max_value) |
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max_value = sum; |
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key = next_key; |
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} |
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for (i = 1; i <= max_key + 1; i++) { |
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stars(starstr, data[i - 1], max_value, MAX_STARS); |
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printf("%8ld -> %-8ld : %-8ld |%-*s|\n", |
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(1l << i) >> 1, (1l << i) - 1, data[i - 1], |
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MAX_STARS, starstr); |
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} |
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close(map_fd); |
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return 0; |
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}
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