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author | John Fastabend <john.fastabend@gmail.com> | 2017-07-17 18:28:56 +0200 |
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committer | David S. Miller <davem@davemloft.net> | 2017-07-17 18:48:06 +0200 |
commit | 546ac1ffb70d25b56c1126940e5ec639c4dd7413 (patch) | |
tree | ee72376133d162b6bacd60cc6c061458a76be88c /tools | |
parent | xdp: add trace event for xdp redirect (diff) | |
download | linux-546ac1ffb70d25b56c1126940e5ec639c4dd7413.tar.xz linux-546ac1ffb70d25b56c1126940e5ec639c4dd7413.zip |
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')
-rw-r--r-- | tools/testing/selftests/bpf/test_maps.c | 15 |
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) close(fd); } +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) |