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SubjectRe: [PATCH bpf-next v1 7/8] bpf: Propagate bpf_per_cpu_ptr() to /tools
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On 8/19/20 3:40 PM, Hao Luo wrote:
> Sync tools/include/linux/uapi/bpf.h with include/linux/uapi/bpf.h

This can be folded into the previous patch.

>
> Signed-off-by: Hao Luo <haoluo@google.com>
> ---
> tools/include/uapi/linux/bpf.h | 15 +++++++++++++++
> 1 file changed, 15 insertions(+)
>
> diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h
> index 468376f2910b..7e3dfb2bbb86 100644
> --- a/tools/include/uapi/linux/bpf.h
> +++ b/tools/include/uapi/linux/bpf.h
> @@ -3415,6 +3415,20 @@ union bpf_attr {
> * A non-negative value equal to or less than *size* on success,
> * or a negative error in case of failure.
> *
> + * void *bpf_per_cpu_ptr(const void *ptr, u32 cpu)
> + * Description
> + * Take the address of a percpu ksym and return a pointer pointing
> + * to the variable on *cpu*. A ksym is an extern variable decorated
> + * with '__ksym'. A ksym is percpu if there is a global percpu var
> + * (either static or global) defined of the same name in the kernel.
> + *
> + * bpf_per_cpu_ptr() has the same semantic as per_cpu_ptr() in the
> + * kernel, except that bpf_per_cpu_ptr() may return NULL. This
> + * happens if *cpu* is larger than nr_cpu_ids. The caller of
> + * bpf_per_cpu_ptr() must check the returned value.
> + * Return
> + * A generic pointer pointing to the variable on *cpu*.
> + *
> */
> #define __BPF_FUNC_MAPPER(FN) \
> FN(unspec), \
> @@ -3559,6 +3573,7 @@ union bpf_attr {
> FN(skc_to_tcp_request_sock), \
> FN(skc_to_udp6_sock), \
> FN(get_task_stack), \
> + FN(bpf_per_cpu_ptr), \
> /* */
>
> /* integer value in 'imm' field of BPF_CALL instruction selects which helper
>

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