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authorToke Høiland-Jørgensen <toke@redhat.com>2019-07-26 18:06:55 +0200
committerAlexei Starovoitov <ast@kernel.org>2019-07-29 13:50:48 -0700
commit6f9d451ab1a33728adb72d7ff66a7b374d665176 (patch)
tree770905d84a709ad9407b82d445d4a88343f3c9c6 /include/trace
parentfca16e51078e8e5c0af839426b3d2dcd2bede135 (diff)
downloadlinux-6f9d451ab1a33728adb72d7ff66a7b374d665176.tar.bz2
xdp: Add devmap_hash map type for looking up devices by hashed index
A common pattern when using xdp_redirect_map() is to create a device map where the lookup key is simply ifindex. Because device maps are arrays, this leaves holes in the map, and the map has to be sized to fit the largest ifindex, regardless of how many devices actually are actually needed in the map. This patch adds a second type of device map where the key is looked up using a hashmap, instead of being used as an array index. This allows maps to be densely packed, so they can be smaller. Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com> Acked-by: Yonghong Song <yhs@fb.com> Acked-by: Jesper Dangaard Brouer <brouer@redhat.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'include/trace')
-rw-r--r--include/trace/events/xdp.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/include/trace/events/xdp.h b/include/trace/events/xdp.h
index 68899fdc985b..8c8420230a10 100644
--- a/include/trace/events/xdp.h
+++ b/include/trace/events/xdp.h
@@ -175,7 +175,8 @@ struct _bpf_dtab_netdev {
#endif /* __DEVMAP_OBJ_TYPE */
#define devmap_ifindex(fwd, map) \
- ((map->map_type == BPF_MAP_TYPE_DEVMAP) ? \
+ ((map->map_type == BPF_MAP_TYPE_DEVMAP || \
+ map->map_type == BPF_MAP_TYPE_DEVMAP_HASH) ? \
((struct _bpf_dtab_netdev *)fwd)->dev->ifindex : 0)
#define _trace_xdp_redirect_map(dev, xdp, fwd, map, idx) \