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 
31 struct vnet_tx_entry {
32 	struct sk_buff		*skb;
33 	unsigned int		ncookies;
34 	struct ldc_trans_cookie	cookies[VNET_MAXCOOKIES];
35 };
36 
37 struct vnet;
38 
39 struct 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  */
58 struct 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 
93 static 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 
101 static 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 
108 struct vnet_mcast_entry {
109 	u8			addr[ETH_ALEN];
110 	u8			sent;
111 	u8			hit;
112 	struct vnet_mcast_entry	*next;
113 };
114 
115 struct 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 */
133 void sunvnet_clean_timer_expire_common(struct timer_list *t);
134 int sunvnet_open_common(struct net_device *dev);
135 int sunvnet_close_common(struct net_device *dev);
136 void sunvnet_set_rx_mode_common(struct net_device *dev, struct vnet *vp);
137 int sunvnet_set_mac_addr_common(struct net_device *dev, void *p);
138 void sunvnet_tx_timeout_common(struct net_device *dev);
139 int sunvnet_start_xmit_common(struct sk_buff *skb, struct net_device *dev,
140 			   struct vnet_port *(*vnet_tx_port)
141 			   (struct sk_buff *, struct net_device *));
142 #ifdef CONFIG_NET_POLL_CONTROLLER
143 void sunvnet_poll_controller_common(struct net_device *dev, struct vnet *vp);
144 #endif
145 void sunvnet_event_common(void *arg, int event);
146 int sunvnet_send_attr_common(struct vio_driver_state *vio);
147 int sunvnet_handle_attr_common(struct vio_driver_state *vio, void *arg);
148 void sunvnet_handshake_complete_common(struct vio_driver_state *vio);
149 int sunvnet_poll_common(struct napi_struct *napi, int budget);
150 void sunvnet_port_free_tx_bufs_common(struct vnet_port *port);
151 void vnet_port_reset(struct vnet_port *port);
152 bool sunvnet_port_is_up_common(struct vnet_port *vnet);
153 void sunvnet_port_add_txq_common(struct vnet_port *port);
154 void sunvnet_port_rm_txq_common(struct vnet_port *port);
155 
156 #endif /* _SUNVNETCOMMON_H */
157