Subskeleton support for BPF libraries #2695
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At least one diff in series https://patchwork.kernel.org/project/netdevbpf/list/?series=622431 expired. Closing PR. |
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Currently, libbpf considers a single routine in .text to be a program. This is particularly confusing when it comes to library objects - a single routine meant to be used as an extern will instead be considered a bpf_program. This patch hides this compatibility behavior behind the pre-existing SEC_NAME strict mode flag. Signed-off-by: Delyan Kratunov <delyank@fb.com>
For internal and user maps, look up the key and value btf types on open() and not load(), so that `bpf_map_btf_value_type_id` is usable in `bpftool gen`. Signed-off-by: Delyan Kratunov <delyank@fb.com>
In symmetry with bpf_object__open_skeleton(), bpf_object__open_subskeleton() performs the actual walking and linking of maps, progs, and globals described by bpf_*_skeleton objects. Signed-off-by: Delyan Kratunov <delyank@fb.com>
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Subskeletons are headers which require an already loaded program to operate. For example, when a BPF library is linked into a larger BPF object file, the library userspace needs a way to access its own global variables without requiring knowledge about the larger program at build time. As a result, subskeletons require a loaded bpf_object to open(). Further, they find their own symbols in the larger program by walking BTF type data at run time. At this time, programs, maps, and globals are supported through non-owning pointers. Signed-off-by: Delyan Kratunov <delyank@fb.com>
This patch changes the selftests/bpf Makefile to also generate a subskel.h for every skel.h it would have normally generated. Separately, it also introduces a new subskeleton test which tests library objects, externs, weak symbols, kconfigs, and user maps. Signed-off-by: Delyan Kratunov <delyank@fb.com>
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At least one diff in series https://patchwork.kernel.org/project/netdevbpf/list/?series=624058 irrelevant now. Closing PR. |
Pull request for series with
subject: Subskeleton support for BPF libraries
version: 2
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=622431