Hi Song
On Tue, Jun 27, 2017 at 10:05 PM, Y Song <ys114321@xxxxxxxxx> wrote:
> 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.
>
Thanks for the quick reply! Now I'm trying xdp1_kern.c which uses
xdp_md. Now I'm getting the error:
Note: 8 bytes struct bpf_elf_map fixup performed due to size mismatch!
RTNETLINK answers: Operation not supported
Could you please advise me what is wrong here?
> 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
Thanks
Tamim
|