nfp: add support for NFDK data path

Add new data path.  The TX is completely different, each packet
has multiple descriptor entries (between 2 and 32).  TX ring is
divided into blocks 32 descriptor, and descritors of one packet
can't cross block bounds. The RX side is the same for now.

ABI version 5 or later is required.  There is no support for
VLAN insertion on TX. XDP_TX action and AF_XDP zero-copy is not
implemented in NFDK path.

Changes to Jakub's work:
* Move statistics of hw_csum_tx after jumbo packet's segmentation.
* Set L3_CSUM flag to enable recaculating of L3 header checksum
in ipv4 case.
* Mark the case of TSO a packet with metadata prepended as
unsupported.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Xingfeng Hu <xingfeng.hu@corigine.com>
Signed-off-by: Yinjun Zhang <yinjun.zhang@corigine.com>
Signed-off-by: Dianchao Wang <dianchao.wang@corigine.com>
Signed-off-by: Fei Qin <fei.qin@corigine.com>
Signed-off-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_dp.h b/drivers/net/ethernet/netronome/nfp/nfp_net_dp.h
index 237ca1d9c886..c934cc2d3208 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_net_dp.h
+++ b/drivers/net/ethernet/netronome/nfp/nfp_net_dp.h
@@ -109,6 +109,7 @@ void nfp_net_rx_ring_reset(struct nfp_net_rx_ring *rx_ring);
 
 enum nfp_nfd_version {
 	NFP_NFD_VER_NFD3,
+	NFP_NFD_VER_NFDK,
 };
 
 /**
@@ -207,6 +208,7 @@ nfp_net_debugfs_print_tx_descs(struct seq_file *file, struct nfp_net_dp *dp,
 }
 
 extern const struct nfp_dp_ops nfp_nfd3_ops;
+extern const struct nfp_dp_ops nfp_nfdk_ops;
 
 netdev_tx_t nfp_net_tx(struct sk_buff *skb, struct net_device *netdev);