Added bpffs pretty print for program array map. For a particular array index, if the program array points to a valid program, the "<index>: <prog_id>" will be printed out like 0: 6 which means bpf program with id "6" is installed at index "0".
Showing the changes to kernel/bpf/arraymap.c (1 of 1 file). Show all
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| @@ -553,6 +553,29 @@ static void bpf_fd_array_map_clear(struct bpf_map *map) · 552 unmodified lines | |||
| 553 | fd_array_map_delete_elem(map, &i); | 553 | fd_array_map_delete_elem(map, &i); |
| 554 | } | 554 | } |
| 555 | 555 | ||
| 556 | static void prog_array_map_seq_show_elem(struct bpf_map *map, void *key, | ||
| 557 | struct seq_file *m) | ||
| 558 | { | ||
| 559 | void **elem, *ptr; | ||
| 560 | u32 prog_id; | ||
| 561 | |||
| 562 | rcu_read_lock(); | ||
| 563 | |||
| 564 | elem = array_map_lookup_elem(map, key); | ||
| 565 | if (elem) { | ||
| 566 | ptr = READ_ONCE(*elem); | ||
| 567 | if (ptr) { | ||
| 568 | seq_printf(m, "%u: ", *(u32 *)key); | ||
| 569 | prog_id = prog_fd_array_sys_lookup_elem(ptr); | ||
| 570 | btf_type_seq_show(map->btf, map->btf_value_type_id, | ||
| 571 | &prog_id, m); | ||
| 572 | seq_puts(m, "\n"); | ||
| 573 | } | ||
| 574 | } | ||
| 575 | |||
| 576 | rcu_read_unlock(); | ||
| 577 | } | ||
| 578 | |||
| 556 | const struct bpf_map_ops prog_array_map_ops = { | 579 | const struct bpf_map_ops prog_array_map_ops = { |
| 557 | .map_alloc_check = fd_array_map_alloc_check, | 580 | .map_alloc_check = fd_array_map_alloc_check, |
| 558 | .map_alloc = array_map_alloc, | 581 | .map_alloc = array_map_alloc, |
| @@ -564,7 +587,7 @@ const struct bpf_map_ops prog_array_map_ops = { · 5 unmodified lines | |||
| 564 | .map_fd_put_ptr = prog_fd_array_put_ptr, | 587 | .map_fd_put_ptr = prog_fd_array_put_ptr, |
| 565 | .map_fd_sys_lookup_elem = prog_fd_array_sys_lookup_elem, | 588 | .map_fd_sys_lookup_elem = prog_fd_array_sys_lookup_elem, |
| 566 | .map_release_uref = bpf_fd_array_map_clear, | 589 | .map_release_uref = bpf_fd_array_map_clear, |
| 567 | .map_check_btf = map_check_no_btf, | 590 | .map_seq_show_elem = prog_array_map_seq_show_elem, |
| 568 | }; | 591 | }; |
| 569 | 592 | ||
| 570 | static struct bpf_event_entry *bpf_event_entry_gen(struct file *perf_file, | 593 | static struct bpf_event_entry *bpf_event_entry_gen(struct file *perf_file, |