nfp: add metadata format bit

We only need FW version in the first cache line of adapter struct
because we need to know the metadata format.  To save space add a
metadata format bit.
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/netronome/nfp/nfp_net.h

@@ -440,6 +440,7 @@ struct nfp_stat_pair {
  * @is_vf:              Is the driver attached to a VF?
  * @bpf_offload_skip_sw:  Offloaded BPF program will not be rerun by cls_bpf
  * @bpf_offload_xdp:	Offloaded BPF program is XDP
+ * @chained_metadata_format:  Firemware will use new metadata format
  * @ctrl:               Local copy of the control register/word.
  * @fl_bufsz:           Currently configured size of the freelist buffers
  * @rx_offset:		Offset in the RX buffers where packet data starts
@@ -507,6 +508,7 @@ struct nfp_net {
 	unsigned is_vf:1;
 	unsigned bpf_offload_skip_sw:1;
 	unsigned bpf_offload_xdp:1;
+	unsigned chained_metadata_format:1;
 
 	u32 ctrl;
 	u32 fl_bufsz;

drivers/net/ethernet/netronome/nfp/nfp_net_common.c

@@ -1652,7 +1652,7 @@ static int nfp_net_rx(struct nfp_net_rx_ring *rx_ring, int budget)
 		skb_reserve(skb, data_off);
 		skb_put(skb, pkt_len);
 
-		if (nn->fw_ver.major <= 3) {
+		if (!nn->chained_metadata_format) {
 			nfp_net_set_hash_desc(nn->netdev, skb, rxd);
 		} else if (meta_len) {
 			void *end;
@@ -3196,6 +3196,8 @@ int nfp_net_netdev_init(struct net_device *netdev)
 	struct nfp_net *nn = netdev_priv(netdev);
 	int err;
 
+	nn->chained_metadata_format = nn->fw_ver.major > 3;
+
 	/* Get some of the read-only fields from the BAR */
 	nn->cap = nn_readl(nn, NFP_NET_CFG_CAP);
 	nn->max_mtu = nn_readl(nn, NFP_NET_CFG_MAX_MTU);