xdp meta data is different:
struct xdp_md {
__u32 data;
__u32 data_end;
};
All other fields available for skb metadata won't be available in XDP.
That is way
you get verification failure.
On Tue, Jun 27, 2017 at 7:00 PM, MD I. Islam <tamim@xxxxxxxxxxx> wrote:
> 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
|