1 // SPDX-License-Identifier: GPL-2.0 2 /* Copyright (c) 2020 Facebook */ 3 #include "bpf_iter.h" 4 #include <bpf/bpf_helpers.h> 5 6 char _license[] SEC("license") = "GPL"; 7 8 __u32 map1_id = 0, map2_id = 0; 9 __u32 map1_accessed = 0, map2_accessed = 0; 10 __u64 map1_seqnum = 0, map2_seqnum1 = 0, map2_seqnum2 = 0; 11 12 volatile const __u32 print_len; 13 volatile const __u32 ret1; 14 15 SEC("iter/bpf_map") dump_bpf_map(struct bpf_iter__bpf_map * ctx)16int dump_bpf_map(struct bpf_iter__bpf_map *ctx) 17 { 18 struct seq_file *seq = ctx->meta->seq; 19 struct bpf_map *map = ctx->map; 20 __u64 seq_num; 21 int i, ret = 0; 22 23 if (map == (void *)0) 24 return 0; 25 26 /* only dump map1_id and map2_id */ 27 if (map->id != map1_id && map->id != map2_id) 28 return 0; 29 30 seq_num = ctx->meta->seq_num; 31 if (map->id == map1_id) { 32 map1_seqnum = seq_num; 33 map1_accessed++; 34 } 35 36 if (map->id == map2_id) { 37 if (map2_accessed == 0) { 38 map2_seqnum1 = seq_num; 39 if (ret1) 40 ret = 1; 41 } else { 42 map2_seqnum2 = seq_num; 43 } 44 map2_accessed++; 45 } 46 47 /* fill seq_file buffer */ 48 for (i = 0; i < print_len; i++) 49 bpf_seq_write(seq, &seq_num, sizeof(seq_num)); 50 51 return ret; 52 } 53