Registrating struct_ops types from modules #5668
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Move most of code to bpf_struct_ops_init_one() that can be use to initialize new struct_ops types registered dynamically.
Provide registration functions to add/remove struct_ops types. Currently, it does linear search to find a struct_ops type. It should be fine for now since we don't have many struct_ops types. Signed-off-by: Kui-Feng Lee <thinker.li@gmail.com>
Every struct_ops type should has an associated module BTF to provide type information since we are going to allow modules to define and register new struct_ops types. New types may exist only in module itself, and the kernel BTF (vmlinux) doesn't know it at all. The attached module BTF here will be used to resolve type IDs of a struct_ops map.
The signatures may be declared in the module defining the structs type. So, we need to know which module BTF to look for type information. The later patches will make libbpf to attach module BTFs to programs. This patch tries to use the attached BTF if there is.
Ensure a module doesn't go away when a struct_ops map is still alive with a struct_ops type defined by the module. Signed-off-by: Kui-Feng Lee <thinker.li@gmail.com>
Find module BTFs for struct_ops maps and progs and pass them to the kernel. It ensures the kernel resolve type IDs from correct module BTFs.
btf_ctx_access() is needed by module to call bpf_tracing_btf_ctx_access().
Signed-off-by: Kui-Feng Lee <thinker.li@gmail.com>
Signed-off-by: Kui-Feng Lee <thinker.li@gmail.com>
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Upstream branch: 5bbb9e1 |
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At least one diff in series https://patchwork.kernel.org/project/netdevbpf/list/?series=783659 expired. Closing PR. |
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Pull request for series with
subject: Registrating struct_ops types from modules
version: 2
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=783659