On Thu, Dec 30, 2021 at 08:06:56AM IST, Kumar Kartikeya Dwivedi wrote: > This series adds unstable conntrack lookup helpers using BPF kfunc support. The > patch adding the lookup helper is based off of Maxim's recent patch to aid in > rebasing their series on top of this, all adjusted to work with module kfuncs [0]. > > [0]: https://lore.kernel.org/bpf/20211019144655.3483197-8-maximmi@xxxxxxxxxx > > To enable returning a reference to struct nf_conn, the verifier is extended to > support reference tracking for PTR_TO_BTF_ID, and kfunc is extended with support > for working as acquire/release functions, similar to existing BPF helpers. kfunc > returning pointer (limited to PTR_TO_BTF_ID in the kernel) can also return a > PTR_TO_BTF_ID_OR_NULL now, typically needed when acquiring a resource can fail. > kfunc can also receive PTR_TO_CTX and PTR_TO_MEM (with some limitations) as > arguments now. There is also support for passing a mem, len pair as argument > to kfunc now. In such cases, passing pointer to unsized type (void) is also > permitted. > > Please see individual commits for details. > > Changelog: > ---------- PR [0] and [1] are needed to make BPF CI green for this set. [0]: https://github.com/kernel-patches/vmtest/pull/53 [1]: https://github.com/libbpf/libbpf/pull/429 > [...] -- Kartikeya
