xref: /openbmc/linux/net/can/af_can.h (revision e23feb16)
1 /*
2  * Copyright (c) 2002-2007 Volkswagen Group Electronic Research
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  * 3. Neither the name of Volkswagen nor the names of its contributors
14  *    may be used to endorse or promote products derived from this software
15  *    without specific prior written permission.
16  *
17  * Alternatively, provided that this notice is retained in full, this
18  * software may be distributed under the terms of the GNU General
19  * Public License ("GPL") version 2, in which case the provisions of the
20  * GPL apply INSTEAD OF those given above.
21  *
22  * The provided data structures and external interfaces from this code
23  * are not restricted to be used by modules with a GPL compatible license.
24  *
25  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
26  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
27  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
28  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
29  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
30  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
31  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
32  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
33  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
35  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
36  * DAMAGE.
37  *
38  */
39 
40 #ifndef AF_CAN_H
41 #define AF_CAN_H
42 
43 #include <linux/skbuff.h>
44 #include <linux/netdevice.h>
45 #include <linux/list.h>
46 #include <linux/rcupdate.h>
47 #include <linux/can.h>
48 
49 /* af_can rx dispatcher structures */
50 
51 struct receiver {
52 	struct hlist_node list;
53 	struct rcu_head rcu;
54 	canid_t can_id;
55 	canid_t mask;
56 	unsigned long matches;
57 	void (*func)(struct sk_buff *, void *);
58 	void *data;
59 	char *ident;
60 };
61 
62 enum { RX_ERR, RX_ALL, RX_FIL, RX_INV, RX_EFF, RX_MAX };
63 
64 /* per device receive filters linked at dev->ml_priv */
65 struct dev_rcv_lists {
66 	struct hlist_head rx[RX_MAX];
67 	struct hlist_head rx_sff[0x800];
68 	int remove_on_zero_entries;
69 	int entries;
70 };
71 
72 /* statistic structures */
73 
74 /* can be reset e.g. by can_init_stats() */
75 struct s_stats {
76 	unsigned long jiffies_init;
77 
78 	unsigned long rx_frames;
79 	unsigned long tx_frames;
80 	unsigned long matches;
81 
82 	unsigned long total_rx_rate;
83 	unsigned long total_tx_rate;
84 	unsigned long total_rx_match_ratio;
85 
86 	unsigned long current_rx_rate;
87 	unsigned long current_tx_rate;
88 	unsigned long current_rx_match_ratio;
89 
90 	unsigned long max_rx_rate;
91 	unsigned long max_tx_rate;
92 	unsigned long max_rx_match_ratio;
93 
94 	unsigned long rx_frames_delta;
95 	unsigned long tx_frames_delta;
96 	unsigned long matches_delta;
97 };
98 
99 /* persistent statistics */
100 struct s_pstats {
101 	unsigned long stats_reset;
102 	unsigned long user_reset;
103 	unsigned long rcv_entries;
104 	unsigned long rcv_entries_max;
105 };
106 
107 /* receive filters subscribed for 'all' CAN devices */
108 extern struct dev_rcv_lists can_rx_alldev_list;
109 
110 /* function prototypes for the CAN networklayer procfs (proc.c) */
111 extern void can_init_proc(void);
112 extern void can_remove_proc(void);
113 extern void can_stat_update(unsigned long data);
114 
115 /* structures and variables from af_can.c needed in proc.c for reading */
116 extern struct timer_list can_stattimer;    /* timer for statistics update */
117 extern struct s_stats    can_stats;        /* packet statistics */
118 extern struct s_pstats   can_pstats;       /* receive list statistics */
119 extern struct hlist_head can_rx_dev_list;  /* rx dispatcher structures */
120 
121 #endif /* AF_CAN_H */
122