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The main change is a move of the single line #include "iterators.lskel.h" from iterators/iterators.c to bpf_preload_kern.c. Which means that generated light skeleton can be used from user space or user mode driver like iterators.c or from the kernel module or the kernel itself. The direct use of light skeleton from the kernel module simplifies the code, since UMD is no longer necessary. The libbpf.a required user space and UMD. The CO-RE in the kernel and generated "loader bpf program" used by the light skeleton are capable to perform complex loading operations traditionally provided by libbpf. In addition UMD approach was launching UMD process every time bpffs has to be mounted. With light skeleton in the kernel the bpf_preload kernel module loads bpf iterators once and pins them multiple times into different bpffs mounts. Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Yonghong Song <yhs@fb.com> Acked-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20220209232001.27490-6-alexei.starovoitov@gmail.com
26 lines
801 B
Text
26 lines
801 B
Text
# SPDX-License-Identifier: GPL-2.0-only
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config USERMODE_DRIVER
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bool
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default n
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menuconfig BPF_PRELOAD
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bool "Preload BPF file system with kernel specific program and map iterators"
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depends on BPF
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depends on BPF_SYSCALL
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# The dependency on !COMPILE_TEST prevents it from being enabled
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# in allmodconfig or allyesconfig configurations
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depends on !COMPILE_TEST
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select USERMODE_DRIVER
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help
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This builds kernel module with several embedded BPF programs that are
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pinned into BPF FS mount point as human readable files that are
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useful in debugging and introspection of BPF programs and maps.
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if BPF_PRELOAD
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config BPF_PRELOAD_UMD
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tristate "bpf_preload kernel module"
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default m
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help
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This builds bpf_preload kernel module with embedded BPF programs for
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introspection in bpffs.
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endif
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