Hi
I'm using http://lingrok.org/xref/linux-net-next/samples/bpf/parse_simple.c.
I can load the program as tc_cls using following commands:
sudo tc qdisc add dev eno1 clsact
sudo tc filter add dev eno1 ingress bpf da obj parse_simple.o sec simple
But I get error when I load the same program in XDP:
sudo ip link set dev eno1 xdp obj parse_simple.o section simple
Prog section 'simple' rejected: Permission denied (13)!
- Type: 6
- Instructions: 23 (0 over limit)
- License: GPL
Verifier analysis:
0: (b7) r0 = 0
1: (61) r2 = *(u32 *)(r1 +80)
invalid bpf_context access off=80 size=4
Error fetching program/map!
I made sure that the parse_simple.o have necessary permission. Could
you please advise what is wrong here? I'm using Kernel 4.11+. Does XDP
need any specific kernel configuration enabled? clang and LLVM
versions are as following:
clang --version
clang version 3.8.0-2ubuntu4 (tags/RELEASE_380/final)
Target: x86_64-pc-linux-gnu
llc --version
LLVM (http://llvm.org/):
LLVM version 3.8.0
Optimized build.
Built Jul 9 2016 (11:22:59).
Default target: x86_64-pc-linux-gnu
Host CPU: haswell
Registered Targets:
aarch64 - AArch64 (little endian)
aarch64_be - AArch64 (big endian)
amdgcn - AMD GCN GPUs
arm - ARM
arm64 - ARM64 (little endian)
armeb - ARM (big endian)
bpf - BPF (host endian)
bpfeb - BPF (big endian)
bpfel - BPF (little endian)
cpp - C++ backend
hexagon - Hexagon
mips - Mips
mips64 - Mips64 [experimental]
mips64el - Mips64el [experimental]
mipsel - Mipsel
msp430 - MSP430 [experimental]
nvptx - NVIDIA PTX 32-bit
nvptx64 - NVIDIA PTX 64-bit
ppc32 - PowerPC 32
ppc64 - PowerPC 64
ppc64le - PowerPC 64 LE
r600 - AMD GPUs HD2XXX-HD6XXX
sparc - Sparc
sparcel - Sparc LE
sparcv9 - Sparc V9
systemz - SystemZ
thumb - Thumb
thumbeb - Thumb (big endian)
x86 - 32-bit X86: Pentium-Pro and above
x86-64 - 64-bit X86: EM64T and AMD64
xcore - XCore
Many thanks
Tamim
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