[PATCH net-next 8/9] nfp: add metadata format bit

[Jakub Kicinski]

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.kicin...@netronome.com>
---
 drivers/net/ethernet/netronome/nfp/nfp_net.h        | 2 ++
 drivers/net/ethernet/netronome/nfp/nfp_net_common.c | 4 +++-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net.h 
b/drivers/net/ethernet/netronome/nfp/nfp_net.h
index 4ad27570b6c4..34f8c439f42f 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_net.h
+++ b/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;
diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c 
b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
index 119775d4097e..2d964d030dbe 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
+++ b/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);
-- 
2.11.0