cannot access per cpu lru hash with the given xdp-filter.c example

[ouvaa]

it seems per cpu lru hash is not supported but how do i access the per cpu map with golang?

https://github.com/xdp-project/xdp-tools/blob/master/xdp-filter/xdp-filter.c

this is what i've tried. any help on this?

package main

import (
	"fmt"
	"log"
	"net"

	"github.com/cilium/ebpf"
	"github.com/cilium/ebpf/rlimit"
)

func main() {
	// Allow the current process to lock memory for eBPF resources.
	if err := rlimit.RemoveMemlock(); err != nil {
		log.Fatal(err)
	}

	// Path where the map is pinned
	pinPath := "/sys/fs/bpf/xdp-filter/filter_ipv4"

	// Load the existing pinned map
	ipMap, err := ebpf.LoadPinnedMap(pinPath, nil)
	if err != nil {
		log.Fatalf("failed to load pinned map: %v", err)
	}
	defer ipMap.Close()

	fmt.Println("Filtered IP addresses:")
	fmt.Printf("  %-15s Hit counters per CPU\n", "IP")

	// Iterate over all entries in the map using a key-value pair
	var key uint32
	possibleCPUs := ebpf.MustPossibleCPU()
	value := make([]uint64, possibleCPUs) // Allocate a slice for per-CPU values

	// Initialize the iterator over the map
	iter := ipMap.Iterate()
	for iter.Next(&key, &value) {
		ip := net.IPv4(byte(key>>24), byte(key>>16), byte(key>>8), byte(key)).String()
		fmt.Printf("  %-15s %v\n", ip, value) // Print all counters per CPU
	}
	if err := iter.Err(); err != nil {
		log.Fatalf("iterating over map failed: %v", err)
	}
}