1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _SUNVNETCOMMON_H
3#define _SUNVNETCOMMON_H
4
5#include <linux/interrupt.h>
6
7/* length of time (or less) we expect pending descriptors to be marked
8 * as VIO_DESC_DONE and skbs ready to be freed
9 */
10#define	VNET_CLEAN_TIMEOUT		((HZ / 100) + 1)
11
12#define VNET_MAXPACKET			(65535ULL + ETH_HLEN + VLAN_HLEN)
13#define VNET_TX_RING_SIZE		512
14#define VNET_TX_WAKEUP_THRESH(dr)	((dr)->pending / 4)
15
16#define	VNET_MINTSO	 2048	/* VIO protocol's minimum TSO len */
17#define	VNET_MAXTSO	65535	/* VIO protocol's maximum TSO len */
18
19#define VNET_MAX_MTU	65535
20
21/* VNET packets are sent in buffers with the first 6 bytes skipped
22 * so that after the ethernet header the IPv4/IPv6 headers are aligned
23 * properly.
24 */
25#define VNET_PACKET_SKIP		6
26
27#define	VNET_MAXCOOKIES			(VNET_MAXPACKET / PAGE_SIZE + 1)
28
29#define	VNET_MAX_TXQS		16
30
31struct vnet_tx_entry {
32	struct sk_buff		*skb;
33	unsigned int		ncookies;
34	struct ldc_trans_cookie	cookies[VNET_MAXCOOKIES];
35};
36
37struct vnet;
38
39struct vnet_port_stats {
40	/* keep them all the same size */
41	u32 rx_bytes;
42	u32 tx_bytes;
43	u32 rx_packets;
44	u32 tx_packets;
45	u32 event_up;
46	u32 event_reset;
47	u32 q_placeholder;
48};
49
50#define NUM_VNET_PORT_STATS  (sizeof(struct vnet_port_stats) / sizeof(u32))
51
52/* Structure to describe a vnet-port or vsw-port in the MD.
53 * If the vsw bit is set, this structure represents a vswitch
54 * port, and the net_device can be found from ->dev. If the
55 * vsw bit is not set, the net_device is available from ->vp->dev.
56 * See the VNET_PORT_TO_NET_DEVICE macro below.
57 */
58struct vnet_port {
59	struct vio_driver_state	vio;
60
61	struct vnet_port_stats stats;
62
63	struct hlist_node	hash;
64	u8			raddr[ETH_ALEN];
65	unsigned		switch_port:1;
66	unsigned		tso:1;
67	unsigned		vsw:1;
68	unsigned		__pad:13;
69
70	struct vnet		*vp;
71	struct net_device	*dev;
72
73	struct vnet_tx_entry	tx_bufs[VNET_TX_RING_SIZE];
74
75	struct list_head	list;
76
77	u32			stop_rx_idx;
78	bool			stop_rx;
79	bool			start_cons;
80
81	struct timer_list	clean_timer;
82
83	u64			rmtu;
84	u16			tsolen;
85
86	struct napi_struct	napi;
87	u32			napi_stop_idx;
88	bool			napi_resume;
89	int			rx_event;
90	u16			q_index;
91};
92
93static inline struct vnet_port *to_vnet_port(struct vio_driver_state *vio)
94{
95	return container_of(vio, struct vnet_port, vio);
96}
97
98#define VNET_PORT_HASH_SIZE	16
99#define VNET_PORT_HASH_MASK	(VNET_PORT_HASH_SIZE - 1)
100
101static inline unsigned int vnet_hashfn(u8 *mac)
102{
103	unsigned int val = mac[4] ^ mac[5];
104
105	return val & (VNET_PORT_HASH_MASK);
106}
107
108struct vnet_mcast_entry {
109	u8			addr[ETH_ALEN];
110	u8			sent;
111	u8			hit;
112	struct vnet_mcast_entry	*next;
113};
114
115struct vnet {
116	spinlock_t		lock; /* Protects port_list and port_hash.  */
117	struct net_device	*dev;
118	u32			msg_enable;
119	u8			q_used[VNET_MAX_TXQS];
120	struct list_head	port_list;
121	struct hlist_head	port_hash[VNET_PORT_HASH_SIZE];
122	struct vnet_mcast_entry	*mcast_list;
123	struct list_head	list;
124	u64			local_mac;
125	int			nports;
126};
127
128/* Def used by common code to get the net_device from the proper location */
129#define VNET_PORT_TO_NET_DEVICE(__port) \
130	((__port)->vsw ? (__port)->dev : (__port)->vp->dev)
131
132/* Common funcs */
133void sunvnet_clean_timer_expire_common(struct timer_list *t);
134int sunvnet_open_common(struct net_device *dev);
135int sunvnet_close_common(struct net_device *dev);
136void sunvnet_set_rx_mode_common(struct net_device *dev, struct vnet *vp);
137int sunvnet_set_mac_addr_common(struct net_device *dev, void *p);
138void sunvnet_tx_timeout_common(struct net_device *dev, unsigned int txqueue);
139netdev_tx_t
140sunvnet_start_xmit_common(struct sk_buff *skb, struct net_device *dev,
141			  struct vnet_port *(*vnet_tx_port)
142			  (struct sk_buff *, struct net_device *));
143#ifdef CONFIG_NET_POLL_CONTROLLER
144void sunvnet_poll_controller_common(struct net_device *dev, struct vnet *vp);
145#endif
146void sunvnet_event_common(void *arg, int event);
147int sunvnet_send_attr_common(struct vio_driver_state *vio);
148int sunvnet_handle_attr_common(struct vio_driver_state *vio, void *arg);
149void sunvnet_handshake_complete_common(struct vio_driver_state *vio);
150int sunvnet_poll_common(struct napi_struct *napi, int budget);
151void sunvnet_port_free_tx_bufs_common(struct vnet_port *port);
152void vnet_port_reset(struct vnet_port *port);
153bool sunvnet_port_is_up_common(struct vnet_port *vnet);
154void sunvnet_port_add_txq_common(struct vnet_port *port);
155void sunvnet_port_rm_txq_common(struct vnet_port *port);
156
157#endif /* _SUNVNETCOMMON_H */
158