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| author | Gerhard Engleder <gerhard@engleder-embedded.com> | 2022-10-13 23:09:22 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-12-31 15:32:03 +0300 |
| commit | 818b68651cde02a94444d1ac56cf4afb12e6d9db (patch) | |
| tree | 58f9b9e953f95333097bb4a8b9bacee5e7eae35b /samples/bpf/xdp1_kern.c | |
| parent | 22d569b3d1a0c031c8d2f35d3558a518e42fca9d (diff) | |
| download | linux-818b68651cde02a94444d1ac56cf4afb12e6d9db.tar.xz | |
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/bpf/xdp1_kern.c')
0 files changed, 0 insertions, 0 deletions