On Fri, Oct 18, 2019 at 11:33:40AM +0200, Magnus Karlsson wrote:

+
+   #include <linux/bpf.h>
+   #include "bpf_helpers.h"
+
+   #define MAX_SOCKS 16
+
+   struct {
+        __uint(type, BPF_MAP_TYPE_XSKMAP);
+        __uint(max_entries, MAX_SOCKS);
+        __uint(key_size, sizeof(int));
+        __uint(value_size, sizeof(int));
+   } xsks_map SEC(".maps");
+
+   struct {
+        __uint(type, BPF_MAP_TYPE_PERCPU_ARRAY);
+        __uint(max_entries, 1);
+        __type(key, int);
+        __type(value, unsigned int);
+   } rr_map SEC(".maps");

hmm. does xsks_map compile?

+
+   SEC("xdp_sock") int xdp_sock_prog(struct xdp_md *ctx)
+   {
+	int key = 0, idx;
+	unsigned int *rr;
+
+	rr = bpf_map_lookup_elem(&rr_map, &key);
+	if (!rr)
+	   return XDP_ABORTED;

could you please use global data and avoid lookup?
The run-time will be much faster.