16879c042SYonghong Song // SPDX-License-Identifier: GPL-2.0 26879c042SYonghong Song /* Copyright (c) 2020 Facebook */ 384544f56SYonghong Song #include "bpf_iter.h" 46879c042SYonghong Song #include <bpf/bpf_helpers.h> 56879c042SYonghong Song 66879c042SYonghong Song char _license[] SEC("license") = "GPL"; 76879c042SYonghong Song 86879c042SYonghong Song __u32 map1_id = 0, map2_id = 0; 96879c042SYonghong Song __u32 map1_accessed = 0, map2_accessed = 0; 106879c042SYonghong Song __u64 map1_seqnum = 0, map2_seqnum1 = 0, map2_seqnum2 = 0; 116879c042SYonghong Song 126879c042SYonghong Song static volatile const __u32 print_len; 136879c042SYonghong Song static volatile const __u32 ret1; 146879c042SYonghong Song 156879c042SYonghong Song SEC("iter/bpf_map") 166879c042SYonghong Song int dump_bpf_map(struct bpf_iter__bpf_map *ctx) 176879c042SYonghong Song { 186879c042SYonghong Song struct seq_file *seq = ctx->meta->seq; 196879c042SYonghong Song struct bpf_map *map = ctx->map; 206879c042SYonghong Song __u64 seq_num; 216879c042SYonghong Song int i, ret = 0; 226879c042SYonghong Song 236879c042SYonghong Song if (map == (void *)0) 246879c042SYonghong Song return 0; 256879c042SYonghong Song 266879c042SYonghong Song /* only dump map1_id and map2_id */ 276879c042SYonghong Song if (map->id != map1_id && map->id != map2_id) 286879c042SYonghong Song return 0; 296879c042SYonghong Song 306879c042SYonghong Song seq_num = ctx->meta->seq_num; 316879c042SYonghong Song if (map->id == map1_id) { 326879c042SYonghong Song map1_seqnum = seq_num; 336879c042SYonghong Song map1_accessed++; 346879c042SYonghong Song } 356879c042SYonghong Song 366879c042SYonghong Song if (map->id == map2_id) { 376879c042SYonghong Song if (map2_accessed == 0) { 386879c042SYonghong Song map2_seqnum1 = seq_num; 396879c042SYonghong Song if (ret1) 406879c042SYonghong Song ret = 1; 416879c042SYonghong Song } else { 426879c042SYonghong Song map2_seqnum2 = seq_num; 436879c042SYonghong Song } 446879c042SYonghong Song map2_accessed++; 456879c042SYonghong Song } 466879c042SYonghong Song 476879c042SYonghong Song /* fill seq_file buffer */ 486879c042SYonghong Song for (i = 0; i < print_len; i++) 496879c042SYonghong Song bpf_seq_write(seq, &seq_num, sizeof(seq_num)); 506879c042SYonghong Song 516879c042SYonghong Song return ret; 526879c042SYonghong Song } 53