veth: bpf_xdp_metadata_rx_hash add xdp rss hash type

Update API for bpf_xdp_metadata_rx_hash() with arg for xdp rss hash type.

The veth driver currently only support XDP-hints based on SKB code path.
The SKB have lost information about the RSS hash type, by compressing
the information down to a single bitfield skb->l4_hash, that only knows
if this was a L4 hash value.

In preparation for veth, the xdp_rss_hash_type have an L4 indication
bit that allow us to return a meaningful L4 indication when working
with SKB based packets.

Fixes: 306531f0249f ("veth: Support RX XDP metadata")
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Acked-by: Toke Høiland-Jørgensen <toke@redhat.com>
Acked-by: Stanislav Fomichev <sdf@google.com>
Link: https://lore.kernel.org/r/168132893055.340624.16209448340644513469.stgit@firesoul
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

diff --git a/drivers/net/veth.c b/drivers/net/veth.c
index 424e887..e1b38fb 100644 (file)
--- a/drivers/net/veth.c
+++ b/drivers/net/veth.c
@@ -1652,11 +1652,14 @@ static int veth_xdp_rx_hash(const struct xdp_md *ctx, u32 *hash,
                            enum xdp_rss_hash_type *rss_type)
 {
        struct veth_xdp_buff *_ctx = (void *)ctx;
+       struct sk_buff *skb = _ctx->skb;
 
-       if (!_ctx->skb)
+       if (!skb)
                return -ENODATA;
 
-       *hash = skb_get_hash(_ctx->skb);
+       *hash = skb_get_hash(skb);
+       *rss_type = skb->l4_hash ? XDP_RSS_TYPE_L4_ANY : XDP_RSS_TYPE_NONE;
+
        return 0;
 }