Hi,
Currently bpftool could disassemble host jited image, for example x86_64,
using libbfd. However it couldn't disassemble offload jited image.
There are two reasons:
1. bpf_obj_get_info_by_fd/struct bpf_prog_info couldn't get the address
of jited image and image's length.
2. Even after issue 1 resolved, bpftool couldn't figure out what is the
offload arch from bpf_prog_info, therefore can't drive libbfd
disassembler correctly.
This patch set resolve issue 1 by introducing two new fields "jited_len"
and "jited_image" in bpf_dev_offload. These two fields serve as the generic
interface to communicate the jited image address and length for all offload
targets to higher level caller. For example, bpf_obj_get_info_by_fd could
use them to fill the userspace visible fields jited_prog_len and
jited_prog_insns.
This patch set resolve issue 2 by getting bfd backend name through
"ifindex", i.e network interface index.
v1:
- Deduct bfd arch name through ifindex, i.e network interface index.
First, map ifindex to devname through ifindex_to_name_ns, then get
pci id through /sys/class/dev/DEVNAME/device/vendor. (Daniel, Alexei)
Jiong Wang (3):
bpf: add new jited info fields in bpf_dev_offload and bpf_prog_info
nfp: bpf: set new jit info fields
tools: bpftool: improve architecture detection by using ifindex
drivers/net/ethernet/netronome/nfp/bpf/offload.c | 10 +++-
include/linux/bpf.h | 2 +
kernel/bpf/offload.c | 23 ++++++++
kernel/bpf/syscall.c | 31 +++++-----
tools/bpf/bpftool/common.c | 72 ++++++++++++++++++++++++
tools/bpf/bpftool/jit_disasm.c | 16 +++++-
tools/bpf/bpftool/main.h | 5 +-
tools/bpf/bpftool/prog.c | 12 +++-
8 files changed, 154 insertions(+), 17 deletions(-)
--
2.15.1
