diff options
| author | Benjamin Poirier <bpoirier@suse.com> | 2019-04-15 09:15:36 +0200 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2019-04-16 10:16:33 +0200 |
| commit | 3da6e7e408b9c229e5e5cc1ddab7445c7561afc3 (patch) | |
| tree | 9097ac7ca26c6bbd6ba77ef690824fc64dec739b /tools/bpf | |
| parent | bpftool: Use print_entry_error() in case of ENOENT when dumping (diff) | |
| download | linux-3da6e7e408b9c229e5e5cc1ddab7445c7561afc3.tar.xz linux-3da6e7e408b9c229e5e5cc1ddab7445c7561afc3.zip | |
bpftool: Improve handling of ENOSPC on reuseport_array map dumps
avoids outputting a series of
value:
No space left on device
The value itself is not wrong but bpf_fd_reuseport_array_lookup_elem() can
only return it if the map was created with value_size = 8. There's nothing
bpftool can do about it. Instead of repeating this error for every key in
the map, print an explanatory warning and a specialized error.
example before:
key: 00 00 00 00
value:
No space left on device
key: 01 00 00 00
value:
No space left on device
key: 02 00 00 00
value:
No space left on device
Found 0 elements
example after:
Warning: cannot read values from reuseport_sockarray map with value_size != 8
key: 00 00 00 00 value: <cannot read>
key: 01 00 00 00 value: <cannot read>
key: 02 00 00 00 value: <cannot read>
Found 0 elements
Signed-off-by: Benjamin Poirier <bpoirier@suse.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'tools/bpf')
| -rw-r--r-- | tools/bpf/bpftool/map.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/tools/bpf/bpftool/map.c b/tools/bpf/bpftool/map.c index df958af56b6c..44b192e87708 100644 --- a/tools/bpf/bpftool/map.c +++ b/tools/bpf/bpftool/map.c @@ -719,6 +719,9 @@ static int dump_map_elem(int fd, void *key, void *value, if (errno == ENOENT) msg = "<no entry>"; + else if (lookup_errno == ENOSPC && + map_info->type == BPF_MAP_TYPE_REUSEPORT_SOCKARRAY) + msg = "<cannot read>"; print_entry_error(map_info, key, msg ? : strerror(lookup_errno)); @@ -775,6 +778,10 @@ static int do_dump(int argc, char **argv) } } + if (info.type == BPF_MAP_TYPE_REUSEPORT_SOCKARRAY && + info.value_size != 8) + p_info("Warning: cannot read values from %s map with value_size != 8", + map_type_name[info.type]); while (true) { err = bpf_map_get_next_key(fd, prev_key, key); if (err) { |