| Message ID | 20200819224030.1615203-8-haoluo@google.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | bpf: BTF support for ksyms | expand |
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 >
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
Sync tools/include/linux/uapi/bpf.h with include/linux/uapi/bpf.h Signed-off-by: Hao Luo <haoluo@google.com> --- tools/include/uapi/linux/bpf.h | 15 +++++++++++++++ 1 file changed, 15 insertions(+)