On Mon, Mar 4, 2019 at 10:45 PM Kanthi P <pavuluri.kan...@gmail.com> wrote:
>
> Thanks for that!
>
> I think those work because bcc has given utilities to do that.
>
> I am using C and we use libbpf to load programs and to do map operations.
>
> Do you know if we can achieve it in this way too?
You should be able to do the work with C as well. Just use APIs from libbpf.h,
e.g., bpf_prog_get_next_id, bpf_prog_get_fd_by_id, bpf_map_get_fd_by_id.
Yes, we may miss bpf_map_get_next_id and bpf_obj_get_info_by_fd.
You can just add prototype to bcc/src/cc/libbpf.h and the implementation
is libbpf submodule.
We can add the missing piece in bcc/src/cc/{libbpf.h, libbpf.c}.
>
> Thanks,
> Kanthi
>
> On Tue, Mar 5, 2019 at 2:21 AM Y Song <ys114...@gmail.com> wrote:
>>
>> On Mon, Mar 4, 2019 at 9:52 AM Kanthi P <pavuluri.kan...@gmail.com> wrote:
>> >
>> > Hi,
>> >
>> > I have two eBPF programs, each with its own user and kernel programs.
>> >
>> > One of the programs defines an eBPF map.
>> >
>> > How do I access this map from another eBPF kernel program?
>>
>> In examples/cpp, we have UseExternalMap.cc, which gives an example of
>> how to share maps between two processes with C++ interface.
>> Basically, if you know the ID of the map in another application (you
>> can see id use bpftool), you can get a fd for that map by ID with API
>> `bpf_map_get_fd_by_id()`, and example shows how to inject the new `fd`
>> to bcc compilation system.
>>
>> We do not have a python way to share map yet bwtween two different processes.
>>
>> Please take a look. If you feel the interface needs to improve to
>> support your use case, we can do that.
>>
>> >
>> > PS:
>> >
>> > I can pin the map and that helps me access this map from other program's
>> > user space.
>> > But looking for a direct way in which I can access this map from other
>> > programs's kernel space.
>> >
>> > Thanks!
>> >
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