Allow bpf_user_ringbuf_drain() callbacks to return 1 #3808
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Master branch: d31ada3 |
The bpf_user_ringbuf_drain() helper function allows a BPF program to specify a callback that is invoked when draining entries from a BPF_MAP_TYPE_USER_RINGBUF ring buffer map. The API is meant to allow the callback to return 0 if it wants to continue draining samples, and 1 if it's done draining. Unfortunately, bpf_user_ringbuf_drain() landed shortly after commit 1bfe26f ("bpf: Add verifier support for custom callback return range"), which changed the default behavior of callbacks to only support returning 0. This patch corrects that oversight by allowing bpf_user_ringbuf_drain() callbacks to return 0 or 1. A follow-on patch will update the user_ringbuf selftests to also return 1 from a bpf_user_ringbuf_drain() callback to prevent this from regressing in the future. Fixes: 2057156 ("bpf: Add bpf_user_ringbuf_drain() helper") Signed-off-by: David Vernet <void@manifault.com>
In commit 1bfe26f ("bpf: Add verifier support for custom callback return range"), the verifier was updated to require callbacks to BPF helpers to explicitly specify the range of values that can be returned. bpf_user_ringbuf_drain() was merged after this in commit 2057156 ("bpf: Add bpf_user_ringbuf_drain() helper"), and this change in default behavior was missed. This patch updates the BPF_MAP_TYPE_USER_RINGBUF selftests to also return 1 from a bpf_user_ringbuf_drain() callback so as to properly test this going forward. Signed-off-by: David Vernet <void@manifault.com>
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Master branch: de9c8d8 |
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At least one diff in series https://patchwork.kernel.org/project/netdevbpf/list/?series=684940 irrelevant now. Closing PR. |
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Pull request for series with
subject: Allow bpf_user_ringbuf_drain() callbacks to return 1
version: 1
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=684940