xdp: Simplify __bpf_tx_xdp_map()

The explicit error checking is not needed. Simply return the error
instead.

Signed-off-by: Björn Töpel <bjorn.topel@intel.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Toke Høiland-Jørgensen <toke@redhat.com>
Link: https://lore.kernel.org/bpf/20191219061006.21980-9-bjorn.topel@gmail.com

diff --git a/net/core/filter.c b/net/core/filter.c
index d9caa3e..217af99 100644 (file)
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -3510,35 +3510,16 @@ err:
 }
 
 static int __bpf_tx_xdp_map(struct net_device *dev_rx, void *fwd,
-                           struct bpf_map *map,
-                           struct xdp_buff *xdp)
+                           struct bpf_map *map, struct xdp_buff *xdp)
 {
-       int err;
-
        switch (map->map_type) {
        case BPF_MAP_TYPE_DEVMAP:
-       case BPF_MAP_TYPE_DEVMAP_HASH: {
-               struct bpf_dtab_netdev *dst = fwd;
-
-               err = dev_map_enqueue(dst, xdp, dev_rx);
-               if (unlikely(err))
-                       return err;
-               break;
-       }
-       case BPF_MAP_TYPE_CPUMAP: {
-               struct bpf_cpu_map_entry *rcpu = fwd;
-
-               err = cpu_map_enqueue(rcpu, xdp, dev_rx);
-               if (unlikely(err))
-                       return err;
-               break;
-       }
-       case BPF_MAP_TYPE_XSKMAP: {
-               struct xdp_sock *xs = fwd;
-
-               err = __xsk_map_redirect(xs, xdp);
-               return err;
-       }
+       case BPF_MAP_TYPE_DEVMAP_HASH:
+               return dev_map_enqueue(fwd, xdp, dev_rx);
+       case BPF_MAP_TYPE_CPUMAP:
+               return cpu_map_enqueue(fwd, xdp, dev_rx);
+       case BPF_MAP_TYPE_XSKMAP:
+               return __xsk_map_redirect(fwd, xdp);
        default:
                break;
        }