Hi,
I'm new to eBPF and bcc and I hope this is the right platform for my
question. I have the following problem while working with a bpf program
array map:
I have a C file that contains a program map like this:
BPF_TABLE("prog", int, int, prog_array, 2);
Later on it is called with
prog_array.call(ebpf_packet, 1);
The respective part of my python file looks like this:
b = BPF(src_file="./output.c")
prog = """
int hello(struct __sk_buff* ebpf_packet) {
bpf_trace_printk("Hello, World!\\n");
return 0;
}
"""
hw = BPF(text=prog)
hello_fn = hw.load_func("hello", BPF.SCHED_CLS)
prog_array = b["prog_array"]
prog_array[ctypes.c_int(1)] = ctypes.c_int(hello_fn.fd)
print prog_array.items()
The output of the last line is just an empty array [] and the subprogram
"hello" is not called when I run the program. There is no error. I have
also hash bpf tables where I can assign key and leaf without any
problems and these tables are accessed correctly during the run.
Do you have any idea where my mistake could be?
Best regards,
Tanja
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