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bpf: iter_udp: Retry with a larger batch size without going back to the previous bucket

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The current logic is to use a default size 16 to batch the whole bucket.
If it is too small, it will retry with a larger batch size.

The current code accidentally does a state->bucket-- before retrying.
This goes back to retry with the previous bucket which has already
been done. This patch fixed it.

It is hard to create a selftest. I added a WARN_ON(state->bucket < 0),
forced a particular port to be hashed to the first bucket,
created >16 sockets, and observed the for-loop went back
to the "-1" bucket.

Cc: Aditi Ghag <aditi.ghag@isovalent.com>
Fixes: c96dac8d369f ("bpf: udp: Implement batching for sockets iterator")
Acked-by: Yonghong Song <yonghong.song@linux.dev>
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Reviewed-by: Aditi Ghag <aditi.ghag@isovalent.com>
Link: https://lore.kernel.org/r/20240112190530.3751661-2-martin.lau@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Martin KaFai Lau 2024-01-12 11:05:28 -08:00 committed by Alexei Starovoitov
parent 894d750831
commit 19ca0823f6
1 changed files with 0 additions and 1 deletions
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1
net/ipv4/udp.c
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@ -3213,7 +3213,6 @@ again:
/* After allocating a larger batch, retry one more time to grab
* the whole bucket.
*/
state->bucket--;
goto again;
}
done: