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| author | Gerhard Engleder <gerhard@engleder-embedded.com> | 2022-10-13 23:09:22 +0300 |
|---|---|---|
| committer | Martin KaFai Lau <martin.lau@kernel.org> | 2022-10-19 20:56:21 +0300 |
| commit | 05ee658c654bacda03f7fecef367e62aaf8e1cfe (patch) | |
| tree | 9809d8442a0399b1b1ddd60b22d90c15619121c3 /samples | |
| parent | a526a3cc9c8d426713f8bebc18ebbe39a8495d82 (diff) | |
| download | linux-05ee658c654bacda03f7fecef367e62aaf8e1cfe.tar.xz | |
samples/bpf: Fix map iteration in xdp1_user
BPF map iteration in xdp1_user results in endless loop without any
output, because the return value of bpf_map_get_next_key() is checked
against the wrong value.
Other call locations of bpf_map_get_next_key() check for equal 0 for
continuing the iteration. xdp1_user checks against unequal -1. This is
wrong for a function which can return arbitrary negative errno values,
because a return value of e.g. -2 results in an endless loop.
With this fix xdp1_user is printing statistics again:
proto 0: 1 pkt/s
proto 0: 1 pkt/s
proto 17: 107383 pkt/s
proto 17: 881655 pkt/s
proto 17: 882083 pkt/s
proto 17: 881758 pkt/s
Fixes: bd054102a8c7 ("libbpf: enforce strict libbpf 1.0 behaviors")
Signed-off-by: Gerhard Engleder <gerhard@engleder-embedded.com>
Acked-by: Song Liu <song@kernel.org>
Link: https://lore.kernel.org/r/20221013200922.17167-1-gerhard@engleder-embedded.com
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Diffstat (limited to 'samples')
| -rw-r--r-- | samples/bpf/xdp1_user.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/samples/bpf/xdp1_user.c b/samples/bpf/xdp1_user.c index ac370e638fa3..281dc964de8d 100644 --- a/samples/bpf/xdp1_user.c +++ b/samples/bpf/xdp1_user.c @@ -51,7 +51,7 @@ static void poll_stats(int map_fd, int interval) sleep(interval); - while (bpf_map_get_next_key(map_fd, &key, &key) != -1) { + while (bpf_map_get_next_key(map_fd, &key, &key) == 0) { __u64 sum = 0; assert(bpf_map_lookup_elem(map_fd, &key, values) == 0); |