xdp-forward: Use DEVMAP_HASH map types

The DEVMAP map types used by xdp-forward prevents installing xdp-forward
on ifindexes larger than the map size, because the ifindex is also used
as the lookup key. Change to DEVMAP_HASH to avoid this.

Signed-off-by: Toke Høiland-Jørgensen <[email protected]>

Author: tohojo

xdp-forward/xdp_flowtable.bpf.c

@@ -19,7 +19,7 @@
 #define BIT(x)				(1 << (x))
 
 struct {
-	__uint(type, BPF_MAP_TYPE_DEVMAP);
+	__uint(type, BPF_MAP_TYPE_DEVMAP_HASH);
 	__uint(key_size, sizeof(int));
 	__uint(value_size, sizeof(int));
 	__uint(max_entries, 64);

xdp-forward/xdp_forward.bpf.c

@@ -13,7 +13,7 @@
 #define IPV6_FLOWINFO_MASK              bpf_htons(0x0FFFFFFF)
 
 struct {
-	__uint(type, BPF_MAP_TYPE_DEVMAP);
+	__uint(type, BPF_MAP_TYPE_DEVMAP_HASH);
 	__uint(key_size, sizeof(int));
 	__uint(value_size, sizeof(int));
 	__uint(max_entries, 64);