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Questions - libbpf

Unable to fetch data using bpf_map_lookup_elem()

I am trying to write a code for XDP where a user space program will populate a bpf map and then later the Kernel will look into the map. For creating the map I have added a SEC(".maps") in t...
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Rishab

ebpf

bpf

xdp-bpf

xdp-ebpf

libbpf

Votes: 0

Answers: 1

Latest Answer

Actually, I found the issue. I had to change my key definition from: struct Key { uint32_t srcIP; uint16_t srcPort; }; to: struct Key { uint32_t IP; uint32_t port; }; This has someth...
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Rishab

What is the difference between syscalls openat and sys_enter_openat?

I see for python BCC implementation the syscall __x64_sys_openat is used to attach a kprobe, however in libbpf implementation a kprobe is attached to sys_enter_openat. It seems both capture openat() s...
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phoxd

system-calls

ebpf

bcc-bpf

libbpf

Votes: 0

Answers: 1

Latest Answer

__x64_sys_openat is the name of some function in the Linux kernel, to which BCC attaches a kprobe. sys_enter_openat is the name of a tracepoint in Linux, meaning that this is a (more or less) stable i...
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Qeole

BPF lib documentation

I have created an app with BPF library(https://github.com/libbpf/libbpf). Unfortunately it does not have documentation or at least I have not found it yet. Only thing I have found is this https://libb...
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Zakys98

c

ebpf

bpf

libbpf

Votes: 0

Answers: 1

Latest Answer

You have found the GitHub mirror for the project (the “original” sources are in the Linux kernel repository) and the official API documentation. The latter is generated from the source code, in partic...
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Qeole

Error fixing up map structure, incompatible struct bpf_elf_map used?

I am trying to learn ebpf map. Compiling the code with libbpf but getting the error like "Error fixing up map structure, incompatible struct bpf_elf_map used?". Here is my ebpf code: #inclu...
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Omar Faroque Anik

ebpf

bpf

libbpf

Votes: 0

Answers: 1

Latest Answer

I think you need to declare your map according to the libbpf style: #define __uint(name, val) int(*(name))[val] #define __type(name, val) typeof(val) *(name) struct { __uint(type, BPF_MAP_TYPE_HA...
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pchaigno

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