> However, I have a use case where data used to filter perf events can > change and can > be loaded as a full map, much after the bpf program is loaded. The > map will be pinned, > but the bpf program currently has no way to access this map. Can this use case > be addressed? I'm not sure entirely how, since I have only just started playing with this map type, but I suspect a workaround is possible with BPF_TYPE_ARRAY_OF_MAPS. My suspicion is that you could store the map you want to replace at index 0 in a pinned array of maps. The XDP program would load the map out of the array to use it. To change the map, have a userspace program load the new map, then set it as index 0 in the pinned array of maps. The next time the XDP program runs, it will pull the new map from index 0. Maybe that will work for you? --Zvi
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