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3cfd886dc5
Some of these functions fail to compile when not inlined, so we should be explicit. Before deciding on this approach I tried various ways of making all these functions #[inline(never)] to save instructions but I ran into blockers: - These functions currently return Result, which is a structure. This is not permitted in BPF. - I tried inventing a newtype that is a #[repr(transparent)] wrapper of u16, and having these functions return that; however it seems that even if the object code is legal, the verifier will reject such functions because the BTF (if present, and it was in my local experiments) would indicate that the return is a structure. - I tried having these functions return a plain u16 where 0 means error, but the verifier still rejected the BTF because the receiver (even if made into &self) is considered a structure, and forbidden. We can eventually overcome these problems by "lying" in our BTF once support for it matures in the bpf-linker repo (e.g. Option<NonZeroU16> should be perfectly legal as it is guaranteed to be word-sized), but we aren't there yet, and this is the safest thing we can do for now. |
1 year ago | |
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| .. | ||
| .cargo | 1 year ago | |
| src | 1 year ago | |
| Cargo.toml | 1 year ago | |
| build.rs | 1 year ago | |
| rust-toolchain.toml | 1 year ago | |