path: root/tools/testing/selftests/bpf/test_maps.c
diff options
authorJohn Fastabend <john.fastabend@gmail.com>2017-07-17 09:28:56 -0700
committerDavid S. Miller <davem@davemloft.net>2017-07-17 09:48:06 -0700
commit546ac1ffb70d25b56c1126940e5ec639c4dd7413 (patch)
treeee72376133d162b6bacd60cc6c061458a76be88c /tools/testing/selftests/bpf/test_maps.c
parentxdp: add trace event for xdp redirect (diff)
bpf: add devmap, a map for storing net device references
Device map (devmap) is a BPF map, primarily useful for networking applications, that uses a key to lookup a reference to a netdevice. The map provides a clean way for BPF programs to build virtual port to physical port maps. Additionally, it provides a scoping function for the redirect action itself allowing multiple optimizations. Future patches will leverage the map to provide batching at the XDP layer. Another optimization/feature, that is not yet implemented, would be to support multiple netdevices per key to support efficient multicast and broadcast support. Signed-off-by: John Fastabend <john.fastabend@gmail.com> Acked-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Jesper Dangaard Brouer <brouer@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'tools/testing/selftests/bpf/test_maps.c')
1 files changed, 15 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/test_maps.c b/tools/testing/selftests/bpf/test_maps.c
index 79601c81e169..36d6ac3f0c1c 100644
--- a/tools/testing/selftests/bpf/test_maps.c
+++ b/tools/testing/selftests/bpf/test_maps.c
@@ -438,6 +438,21 @@ static void test_arraymap_percpu_many_keys(void)
+static void test_devmap(int task, void *data)
+ int next_key, fd;
+ __u32 key, value;
+ fd = bpf_create_map(BPF_MAP_TYPE_DEVMAP, sizeof(key), sizeof(value),
+ 2, 0);
+ if (fd < 0) {
+ printf("Failed to create arraymap '%s'!\n", strerror(errno));
+ exit(1);
+ }
+ close(fd);
#define MAP_SIZE (32 * 1024)
static void test_map_large(void)