Messages in this thread | | | Subject | Re: [PATCH bpf-next v1 7/8] bpf: Propagate bpf_per_cpu_ptr() to /tools | From | Yonghong Song <> | Date | Thu, 20 Aug 2020 10:30:35 -0700 |
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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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