Push to bpf map stack type

Question

I'm looking for a method to send data from userspace to bpf program in Linux. I use libbpf in userspace and bpf_helpers in bpf program in kernel. I now can send data from kernel to user by ringbuf and other. but I want to use stack and queue for this. I can't find function that handles queue or stack in userspace and I still confused. My question is: how can I send data from userspace to bpf program using stack or queue and get it in my bpf program, as what we do in bcc with bpf['queue'].push in userspace for example and queue.peek(&val); in bpf program.

thank you for any help!

Answer 1

You should use the usual bpf_map_update_elem and bpf_map_lookup_elem functions for BPF_MAP_TYPE_QUEUE and BPF_MAP_TYPE_STACK maps.

You can find several examples in the kernel source code:

• Stack example with push and peek
• Queue example with push and peek
• Example handling both stack and queue maps