net/funeth: probing and netdev ops

This is the first part of the Fungible ethernet driver. It deals with
device probing, net_device creation, and netdev ops.

Signed-off-by: Dimitris Michailidis <dmichail@fungible.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/fungible/funeth/funeth.h

@@ -0,0 +1,171 @@
+/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause) */
+
+#ifndef _FUNETH_H
+#define _FUNETH_H
+
+#include <uapi/linux/if_ether.h>
+#include <uapi/linux/net_tstamp.h>
+#include <linux/mutex.h>
+#include <linux/seqlock.h>
+#include <linux/xarray.h>
+#include <net/devlink.h>
+#include "fun_dev.h"
+
+#define ADMIN_SQE_SIZE SZ_128
+#define ADMIN_CQE_SIZE SZ_64
+#define ADMIN_RSP_MAX_LEN (ADMIN_CQE_SIZE - sizeof(struct fun_cqe_info))
+
+#define FUN_MAX_MTU 9024
+
+#define SQ_DEPTH 512U
+#define CQ_DEPTH 1024U
+#define RQ_DEPTH (512U / (PAGE_SIZE / 4096))
+
+#define CQ_INTCOAL_USEC 10
+#define CQ_INTCOAL_NPKT 16
+#define SQ_INTCOAL_USEC 10
+#define SQ_INTCOAL_NPKT 16
+
+#define INVALID_LPORT 0xffff
+
+#define FUN_PORT_CAP_PAUSE_MASK (FUN_PORT_CAP_TX_PAUSE | FUN_PORT_CAP_RX_PAUSE)
+
+struct fun_vport_info {
+	u8 mac[ETH_ALEN];
+	u16 vlan;
+	__be16 vlan_proto;
+	u8 qos;
+	u8 spoofchk:1;
+	u8 trusted:1;
+	unsigned int max_rate;
+};
+
+/* "subclass" of fun_dev for Ethernet functions */
+struct fun_ethdev {
+	struct fun_dev fdev;
+
+	/* the function's network ports */
+	struct net_device **netdevs;
+	unsigned int num_ports;
+
+	/* configuration for the function's virtual ports */
+	unsigned int num_vports;
+	struct fun_vport_info *vport_info;
+
+	struct mutex state_mutex; /* nests inside RTNL if both taken */
+
+	unsigned int nsqs_per_port;
+};
+
+static inline struct fun_ethdev *to_fun_ethdev(struct fun_dev *p)
+{
+	return container_of(p, struct fun_ethdev, fdev);
+}
+
+struct fun_qset {
+	struct funeth_rxq **rxqs;
+	struct funeth_txq **txqs;
+	struct funeth_txq **xdpqs;
+	unsigned int nrxqs;
+	unsigned int ntxqs;
+	unsigned int nxdpqs;
+	unsigned int rxq_start;
+	unsigned int txq_start;
+	unsigned int xdpq_start;
+	unsigned int cq_depth;
+	unsigned int rq_depth;
+	unsigned int sq_depth;
+	int state;
+};
+
+/* Per netdevice driver state, i.e., netdev_priv. */
+struct funeth_priv {
+	struct fun_dev *fdev;
+	struct pci_dev *pdev;
+	struct net_device *netdev;
+
+	struct funeth_rxq * __rcu *rxqs;
+	struct funeth_txq **txqs;
+	struct funeth_txq * __rcu *xdpqs;
+
+	struct xarray irqs;
+	unsigned int num_tx_irqs;
+	unsigned int num_rx_irqs;
+	unsigned int rx_irq_ofst;
+
+	unsigned int lane_attrs;
+	u16 lport;
+
+	/* link settings */
+	u64 port_caps;
+	u64 advertising;
+	u64 lp_advertising;
+	unsigned int link_speed;
+	u8 xcvr_type;
+	u8 active_fc;
+	u8 active_fec;
+	u8 link_down_reason;
+	seqcount_t link_seq;
+
+	u32 msg_enable;
+
+	unsigned int num_xdpqs;
+
+	/* ethtool, etc. config parameters */
+	unsigned int sq_depth;
+	unsigned int rq_depth;
+	unsigned int cq_depth;
+	unsigned int cq_irq_db;
+	u8 tx_coal_usec;
+	u8 tx_coal_count;
+	u8 rx_coal_usec;
+	u8 rx_coal_count;
+
+	struct hwtstamp_config hwtstamp_cfg;
+
+	/* cumulative queue stats from earlier queue instances */
+	u64 tx_packets;
+	u64 tx_bytes;
+	u64 tx_dropped;
+	u64 rx_packets;
+	u64 rx_bytes;
+	u64 rx_dropped;
+
+	/* RSS */
+	unsigned int rss_hw_id;
+	enum fun_eth_hash_alg hash_algo;
+	u8 rss_key[FUN_ETH_RSS_MAX_KEY_SIZE];
+	unsigned int indir_table_nentries;
+	u32 indir_table[FUN_ETH_RSS_MAX_INDIR_ENT];
+	dma_addr_t rss_dma_addr;
+	void *rss_cfg;
+
+	/* DMA area for port stats */
+	dma_addr_t stats_dma_addr;
+	__be64 *stats;
+
+	struct bpf_prog *xdp_prog;
+
+	struct devlink_port dl_port;
+
+	/* kTLS state */
+	unsigned int ktls_id;
+	atomic64_t tx_tls_add;
+	atomic64_t tx_tls_del;
+	atomic64_t tx_tls_resync;
+};
+
+void fun_set_ethtool_ops(struct net_device *netdev);
+int fun_port_write_cmd(struct funeth_priv *fp, int key, u64 data);
+int fun_port_read_cmd(struct funeth_priv *fp, int key, u64 *data);
+int fun_create_and_bind_tx(struct funeth_priv *fp, u32 sqid);
+int fun_replace_queues(struct net_device *dev, struct fun_qset *newqs,
+		       struct netlink_ext_ack *extack);
+int fun_change_num_queues(struct net_device *dev, unsigned int ntx,
+			  unsigned int nrx);
+void fun_set_ring_count(struct net_device *netdev, unsigned int ntx,
+			unsigned int nrx);
+int fun_config_rss(struct net_device *dev, int algo, const u8 *key,
+		   const u32 *qtable, u8 op);
+
+#endif /* _FUNETH_H */