On Mon, Sep 13, 2021 at 10:44 AM Zvi Effron <zeffron@xxxxxxxxxxxxx> wrote: > > Hi all, > > We have some map-of-arrays that we use for tracking labeled metrics in > our XDP code. The inner map tracks the metrics for a given label, > which is the key in the outer map. > > Our XDP code calls several global BPF functions (freplaced, so can't > be inlined). Currently, each global function has to make a lookup to > get the inner map to record its metrics. Now that non-context pointers > can be passed to global BPF functions, is it possible to pass maps to > these global functions? The program can pass a pointer to struct bpf_map and the verifier will recognize it as PTR_TO_BTF_ID. It won't be a CONST_PTR_TO_MAP, so secondary lookup won't be allowed, but if that's the desired use case then the verifier can be extended to recognize it.
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