From: Alexei Starovoitov <ast@plumgrid.com>
Date: Mon, 1 Dec 2014 23:06:37 +0000 (-0800)
Subject: samples: bpf: elf_bpf file loader
X-Git-Tag: omap-for-v3.20/drop-legacy-3517~122^2~93^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=249b812d8005ec38e351ee763ceb85d56b155064;p=pandora-kernel.git

samples: bpf: elf_bpf file loader

simple .o parser and loader using BPF syscall.
.o is a standard ELF generated by LLVM backend

It parses elf file compiled by llvm .c->.o
- parses 'maps' section and creates maps via BPF syscall
- parses 'license' section and passes it to syscall
- parses elf relocations for BPF maps and adjusts BPF_LD_IMM64 insns
  by storing map_fd into insn->imm and marking such insns as BPF_PSEUDO_MAP_FD
- loads eBPF programs via BPF syscall

One ELF file can contain multiple BPF programs.

int load_bpf_file(char *path);
populates prog_fd[] and map_fd[] with FDs received from bpf syscall

bpf_helpers.h - helper functions available to eBPF programs written in C

Signed-off-by: Alexei Starovoitov <ast@plumgrid.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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