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author | Gerhard Engleder <gerhard@engleder-embedded.com> | 2022-10-13 22:09:22 +0200 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-12-31 13:32:03 +0100 |
commit | 818b68651cde02a94444d1ac56cf4afb12e6d9db (patch) | |
tree | 58f9b9e953f95333097bb4a8b9bacee5e7eae35b /samples | |
parent | 22d569b3d1a0c031c8d2f35d3558a518e42fca9d (diff) | |
download | linux-818b68651cde02a94444d1ac56cf4afb12e6d9db.tar.gz |
samples/bpf: Fix map iteration in xdp1_user
[ Upstream commit 05ee658c654bacda03f7fecef367e62aaf8e1cfe ] 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> Signed-off-by: Sasha Levin <sashal@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); |