Re: [PATCH bpf-next v1 7/8] bpf: Propagate bpf_per_cpu_ptr() to /tools

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