bpf: Introduce bpf_per_cpu_ptr()

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Add bpf_per_cpu_ptr() to help bpf programs access percpu vars.
bpf_per_cpu_ptr() has the same semantic as per_cpu_ptr() in the kernel
except that it may return NULL. This happens when the cpu parameter is
out of range. So the caller must check the returned value.

Signed-off-by: Hao Luo <haoluo@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/20200929235049.2533242-5-haoluo@google.com

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Hao Luo 2020-09-29 16:50:47 -07:00 • committed by Alexei Starovoitov

parent 2c2f6abeff

commit eaa6bcb71e

8 changed files with 132 additions and 13 deletions

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4

include/linux/bpf.h

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11

include/linux/btf.h

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18

include/uapi/linux/bpf.h

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