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aya: add feature probing for program and map type #1063

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aya: add feature probing for program and map type #1063

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Commits on Oct 24, 2024

  1. chore: remove aya_obj -> obj alias 

    When `aya::obj` was migrated to be its own crate `aya-obj`, the `obj`
alias was created to preserve existing imports that relied on
`crate::obj`.

This resulted in 3 ways to import `aya-obj` objects:
- `use aya_obj::*`
- `use obj::*`
- `use crate::obj::*`

The `obj` alias is now removed to avoid confusion, and all `obj` imports
should now refer to `aya_obj`.
    @tyrone-wu
    tyrone-wu committed Oct 24, 2024
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  2. aya,aya-obj: add feature probing program type 

    Adds API that probes whether kernel supports a program type.

Additionally add `const fn bpf_insn::new()` so that common instructions
are not re-computed from `copy_instructions()`.

Assertions for `LircMode2` and `Lsm` are disabled because they require
certain kernel configs to be enabled, which are not by default in VM
tests.
    @tyrone-wu
    tyrone-wu committed Oct 24, 2024
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  3. aya: add feature probing for map type 

    Add API that probes whether kernel supports a map type.

Assertion for `InodeStorage` are disabled because they require
CONFIG_BPF_LSM to be enabled, which is not be default in VM tests.
    @tyrone-wu
    tyrone-wu committed Oct 24, 2024
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  4. aya,aya-obj: cache feat probed info fields 

    Cached probed for ProgramInfo fields instead of exposing it through
global FEATURE. Probing operation happens on cache miss, which happens
when first accessing the field, *and* if the field is 0. No need to
probe if non-zero.
    @tyrone-wu
    tyrone-wu committed Oct 24, 2024
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