aboutsummaryrefslogtreecommitdiffstats
path: root/include/net/snmp.h
blob: ea206bff0dc4c01e8fa6cfa5f00d82add2c96743 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
/*
 *
 *		SNMP MIB entries for the IP subsystem.
 *		
 *		Alan Cox <gw4pts@gw4pts.ampr.org>
 *
 *		We don't chose to implement SNMP in the kernel (this would
 *		be silly as SNMP is a pain in the backside in places). We do
 *		however need to collect the MIB statistics and export them
 *		out of /proc (eventually)
 *
 *		This program is free software; you can redistribute it and/or
 *		modify it under the terms of the GNU General Public License
 *		as published by the Free Software Foundation; either version
 *		2 of the License, or (at your option) any later version.
 *
 *		$Id: snmp.h,v 1.19 2001/06/14 13:40:46 davem Exp $
 *
 */
 
#ifndef _SNMP_H
#define _SNMP_H

#include <linux/cache.h>
#include <linux/snmp.h>

/*
 * Mibs are stored in array of unsigned long.
 */
/*
 * struct snmp_mib{}
 *  - list of entries for particular API (such as /proc/net/snmp)
 *  - name of entries.
 */
struct snmp_mib {
	char *name;
	int entry;
};

#define SNMP_MIB_ITEM(_name,_entry)	{	\
	.name = _name,				\
	.entry = _entry,			\
}

#define SNMP_MIB_SENTINEL {	\
	.name = NULL,		\
	.entry = 0,		\
}

/*
 * We use all unsigned longs. Linux will soon be so reliable that even 
 * these will rapidly get too small 8-). Seriously consider the IpInReceives 
 * count on the 20Gb/s + networks people expect in a few years time!
 */

/* 
 * The rule for padding: 
 * Best is power of two because then the right structure can be found by a 
 * simple shift. The structure should be always cache line aligned.
 * gcc needs n=alignto(cachelinesize, popcnt(sizeof(bla_mib))) shift/add 
 * instructions to emulate multiply in case it is not power-of-two. 
 * Currently n is always <=3 for all sizes so simple cache line alignment 
 * is enough. 
 * 
 * The best solution would be a global CPU local area , especially on 64 
 * and 128byte cacheline machine it makes a *lot* of sense -AK
 */ 

#define __SNMP_MIB_ALIGN__	____cacheline_aligned

/* IPstats */
#define IPSTATS_MIB_MAX	__IPSTATS_MIB_MAX
struct ipstats_mib {
	unsigned long	mibs[IPSTATS_MIB_MAX];
} __SNMP_MIB_ALIGN__;

/* ICMP */
#define ICMP_MIB_DUMMY	__ICMP_MIB_MAX
#define ICMP_MIB_MAX	(__ICMP_MIB_MAX + 1)

struct icmp_mib {
	unsigned long	mibs[ICMP_MIB_MAX];
} __SNMP_MIB_ALIGN__;

#define ICMPMSG_MIB_MAX	__ICMPMSG_MIB_MAX
struct icmpmsg_mib {
	unsigned long	mibs[ICMPMSG_MIB_MAX];
} __SNMP_MIB_ALIGN__;

/* ICMP6 (IPv6-ICMP) */
#define ICMP6_MIB_MAX	__ICMP6_MIB_MAX
struct icmpv6_mib {
	unsigned long	mibs[ICMP6_MIB_MAX];
} __SNMP_MIB_ALIGN__;

#define ICMP6MSG_MIB_MAX  __ICMP6MSG_MIB_MAX
struct icmpv6msg_mib {
	unsigned long	mibs[ICMP6MSG_MIB_MAX];
} __SNMP_MIB_ALIGN__;


/* TCP */
#define TCP_MIB_MAX	__TCP_MIB_MAX
struct tcp_mib {
	unsigned long	mibs[TCP_MIB_MAX];
} __SNMP_MIB_ALIGN__;

/* UDP */
#define UDP_MIB_MAX	__UDP_MIB_MAX
struct udp_mib {
	unsigned long	mibs[UDP_MIB_MAX];
} __SNMP_MIB_ALIGN__;

/* Linux */
#define LINUX_MIB_MAX	__LINUX_MIB_MAX
struct linux_mib {
	unsigned long	mibs[LINUX_MIB_MAX];
};


/* 
 * FIXME: On x86 and some other CPUs the split into user and softirq parts
 * is not needed because addl $1,memory is atomic against interrupts (but 
 * atomic_inc would be overkill because of the lock cycles). Wants new 
 * nonlocked_atomic_inc() primitives -AK
 */ 
#define DEFINE_SNMP_STAT(type, name)	\
	__typeof__(type) *name[2]
#define DECLARE_SNMP_STAT(type, name)	\
	extern __typeof__(type) *name[2]

#define SNMP_STAT_BHPTR(name)	(name[0])
#define SNMP_STAT_USRPTR(name)	(name[1])

#define SNMP_INC_STATS_BH(mib, field) 	\
	(per_cpu_ptr(mib[0], raw_smp_processor_id())->mibs[field]++)
#define SNMP_INC_STATS_OFFSET_BH(mib, field, offset)	\
	(per_cpu_ptr(mib[0], raw_smp_processor_id())->mibs[field + (offset)]++)
#define SNMP_INC_STATS_USER(mib, field) \
	(per_cpu_ptr(mib[1], raw_smp_processor_id())->mibs[field]++)
#define SNMP_INC_STATS(mib, field) 	\
	(per_cpu_ptr(mib[!in_softirq()], raw_smp_processor_id())->mibs[field]++)
#define SNMP_DEC_STATS(mib, field) 	\
	(per_cpu_ptr(mib[!in_softirq()], raw_smp_processor_id())->mibs[field]--)
#define SNMP_ADD_STATS_BH(mib, field, addend) 	\
	(per_cpu_ptr(mib[0], raw_smp_processor_id())->mibs[field] += addend)
#define SNMP_ADD_STATS_USER(mib, field, addend) 	\
	(per_cpu_ptr(mib[1], raw_smp_processor_id())->mibs[field] += addend)

#endif