StrixOS/build_soong
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

SOONG: BPF: add libbpf_prog soong module

Browse Source 
This commit adds the libbpf_prog soong module which is heavily based on
the bpf soong module. Due to issues encountered and concerns around
compatibility and testability of mainlined bpf modules, support for
libbpf is added as a separate module.

Specifically, when changing the bpf module from
InitAndroidArchModule(... android.MultilibCommon) to MultilibFirst, the
soong apex bpfs functionality breaks. We have not identified a good
mechanism to fix this, and as we would then be creating architecture
specific bpf program binarys, additional testing and infrastructure
would be required.

It should be noted that libbpf_prog should not be used for features
which target 32bit kernel architectures at this point, as we do not
have a mechanism to identify the kernel arch at build time. I.E. 32bit
userspace could be on either 32bit or 64bit kernel arch, and we require
arch specific includes (vmlinux.h). Therefore, we default to 32bit
userspace on 64bit kernel to match the precedence set with the legacy
bpf programs.

Example use:
libbpf_prog {
    name: "xyz.o",
    srcs: ["xyz.c"],
    arch: {
        arm: {
            local_include_dirs: ["vmlinux/arm64"],
        },
        arm64: {
            local_include_dirs: ["vmlinux/arm64"],
        },
        x86: {
            local_include_dirs: ["vmlinux/x86_64"],
        },
        x86_64: {
            local_include_dirs: ["vmlinux/x86_64"],
        },
    },
}

Bug: 359646531
Test: manual
Change-Id: Ie58515d70abee061470cf4bb803228e00d496ac3
Signed-off-by: Neill Kapron <nkapron@google.com>
This commit is contained in:
Neill Kapron
2024-07-31 22:17:36 +00:00
parent a46053f612
commit 41efab77d0
4 changed files with 386 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
android/androidmk.go
View File

@@ -913,6 +913,7 @@ func translateAndroidModule(ctx SingletonContext, w io.Writer, moduleInfoJSONs *
case "*android_sdk.sdkRepoHost": // doesn't go through base_rules
case "*apex.apexBundle": // license properties written
case "*bpf.bpf": // license properties written (both for module and objs)
case "*libbpf_prog.libbpfProg": // license properties written (both for module and objs)
case "*genrule.Module": // writes non-custom before adding .phony
case "*java.SystemModules": // doesn't go through base_rules
case "*java.systemModulesImport": // doesn't go through base_rules