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1/*
2 *
3 * SNMP MIB entries for the IP subsystem.
4 *
5 * Alan Cox <gw4pts@gw4pts.ampr.org>
6 *
7 * We don't chose to implement SNMP in the kernel (this would
8 * be silly as SNMP is a pain in the backside in places). We do
9 * however need to collect the MIB statistics and export them
10 * out of /proc (eventually)
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version
15 * 2 of the License, or (at your option) any later version.
16 *
17 * $Id: snmp.h,v 1.19 2001/06/14 13:40:46 davem Exp $
18 *
19 */
20
21#ifndef _SNMP_H
22#define _SNMP_H
23
24#include <linux/cache.h>
25#include <linux/snmp.h>
26
27/*
28 * Mibs are stored in array of unsigned long.
29 */
30/*
31 * struct snmp_mib{}
32 * - list of entries for particular API (such as /proc/net/snmp)
33 * - name of entries.
34 */
35struct snmp_mib {
36 char *name;
37 int entry;
38};
39
40#define SNMP_MIB_ITEM(_name,_entry) { \
41 .name = _name, \
42 .entry = _entry, \
43}
44
45#define SNMP_MIB_SENTINEL { \
46 .name = NULL, \
47 .entry = 0, \
48}
49
50/*
51 * We use all unsigned longs. Linux will soon be so reliable that even
52 * these will rapidly get too small 8-). Seriously consider the IpInReceives
53 * count on the 20Gb/s + networks people expect in a few years time!
54 */
55
56/*
57 * The rule for padding:
58 * Best is power of two because then the right structure can be found by a
59 * simple shift. The structure should be always cache line aligned.
60 * gcc needs n=alignto(cachelinesize, popcnt(sizeof(bla_mib))) shift/add
61 * instructions to emulate multiply in case it is not power-of-two.
62 * Currently n is always <=3 for all sizes so simple cache line alignment
63 * is enough.
64 *
65 * The best solution would be a global CPU local area , especially on 64
66 * and 128byte cacheline machine it makes a *lot* of sense -AK
67 */
68
69#define __SNMP_MIB_ALIGN__ ____cacheline_aligned
70
71/* IPstats */
72#define IPSTATS_MIB_MAX __IPSTATS_MIB_MAX
73struct ipstats_mib {
74 unsigned long mibs[IPSTATS_MIB_MAX];
75} __SNMP_MIB_ALIGN__;
76
77/* ICMP */
78#define ICMP_MIB_DUMMY __ICMP_MIB_MAX
79#define ICMP_MIB_MAX (__ICMP_MIB_MAX + 1)
80
81struct icmp_mib {
82 unsigned long mibs[ICMP_MIB_MAX];
83} __SNMP_MIB_ALIGN__;
84
85/* ICMP6 (IPv6-ICMP) */
86#define ICMP6_MIB_MAX __ICMP6_MIB_MAX
87struct icmpv6_mib {
88 unsigned long mibs[ICMP6_MIB_MAX];
89} __SNMP_MIB_ALIGN__;
90
91/* TCP */
92#define TCP_MIB_MAX __TCP_MIB_MAX
93struct tcp_mib {
94 unsigned long mibs[TCP_MIB_MAX];
95} __SNMP_MIB_ALIGN__;
96
97/* UDP */
98#define UDP_MIB_MAX __UDP_MIB_MAX
99struct udp_mib {
100 unsigned long mibs[UDP_MIB_MAX];
101} __SNMP_MIB_ALIGN__;
102
103/* Linux */
104#define LINUX_MIB_MAX __LINUX_MIB_MAX
105struct linux_mib {
106 unsigned long mibs[LINUX_MIB_MAX];
107};
108
109
110/*
111 * FIXME: On x86 and some other CPUs the split into user and softirq parts
112 * is not needed because addl $1,memory is atomic against interrupts (but
113 * atomic_inc would be overkill because of the lock cycles). Wants new
114 * nonlocked_atomic_inc() primitives -AK
115 */
116#define DEFINE_SNMP_STAT(type, name) \
117 __typeof__(type) *name[2]
118#define DECLARE_SNMP_STAT(type, name) \
119 extern __typeof__(type) *name[2]
120
121#define SNMP_STAT_BHPTR(name) (name[0])
122#define SNMP_STAT_USRPTR(name) (name[1])
123
124#define SNMP_INC_STATS_BH(mib, field) \
125 (per_cpu_ptr(mib[0], raw_smp_processor_id())->mibs[field]++)
126#define SNMP_INC_STATS_OFFSET_BH(mib, field, offset) \
127 (per_cpu_ptr(mib[0], raw_smp_processor_id())->mibs[field + (offset)]++)
128#define SNMP_INC_STATS_USER(mib, field) \
129 (per_cpu_ptr(mib[1], raw_smp_processor_id())->mibs[field]++)
130#define SNMP_INC_STATS(mib, field) \
131 (per_cpu_ptr(mib[!in_softirq()], raw_smp_processor_id())->mibs[field]++)
132#define SNMP_DEC_STATS(mib, field) \
133 (per_cpu_ptr(mib[!in_softirq()], raw_smp_processor_id())->mibs[field]--)
134#define SNMP_ADD_STATS_BH(mib, field, addend) \
135 (per_cpu_ptr(mib[0], raw_smp_processor_id())->mibs[field] += addend)
136#define SNMP_ADD_STATS_USER(mib, field, addend) \
137 (per_cpu_ptr(mib[1], raw_smp_processor_id())->mibs[field] += addend)
138
139#endif