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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070017 */
18
19#ifndef _SNMP_H
20#define _SNMP_H
21
22#include <linux/cache.h>
23#include <linux/snmp.h>
Herbert Xud647b362007-12-20 04:13:21 -080024#include <linux/smp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070025
26/*
27 * Mibs are stored in array of unsigned long.
28 */
29/*
30 * struct snmp_mib{}
31 * - list of entries for particular API (such as /proc/net/snmp)
32 * - name of entries.
33 */
34struct snmp_mib {
Alexey Dobriyan58339292010-01-22 10:17:26 +000035 const char *name;
Linus Torvalds1da177e2005-04-16 15:20:36 -070036 int entry;
37};
38
39#define SNMP_MIB_ITEM(_name,_entry) { \
40 .name = _name, \
41 .entry = _entry, \
42}
43
44#define SNMP_MIB_SENTINEL { \
45 .name = NULL, \
46 .entry = 0, \
47}
48
49/*
50 * We use all unsigned longs. Linux will soon be so reliable that even
51 * these will rapidly get too small 8-). Seriously consider the IpInReceives
52 * count on the 20Gb/s + networks people expect in a few years time!
53 */
54
55/*
56 * The rule for padding:
57 * Best is power of two because then the right structure can be found by a
58 * simple shift. The structure should be always cache line aligned.
59 * gcc needs n=alignto(cachelinesize, popcnt(sizeof(bla_mib))) shift/add
60 * instructions to emulate multiply in case it is not power-of-two.
61 * Currently n is always <=3 for all sizes so simple cache line alignment
62 * is enough.
63 *
64 * The best solution would be a global CPU local area , especially on 64
65 * and 128byte cacheline machine it makes a *lot* of sense -AK
66 */
67
68#define __SNMP_MIB_ALIGN__ ____cacheline_aligned
69
70/* IPstats */
71#define IPSTATS_MIB_MAX __IPSTATS_MIB_MAX
72struct ipstats_mib {
73 unsigned long mibs[IPSTATS_MIB_MAX];
74} __SNMP_MIB_ALIGN__;
75
76/* ICMP */
77#define ICMP_MIB_DUMMY __ICMP_MIB_MAX
78#define ICMP_MIB_MAX (__ICMP_MIB_MAX + 1)
79
80struct icmp_mib {
81 unsigned long mibs[ICMP_MIB_MAX];
82} __SNMP_MIB_ALIGN__;
83
David L Stevens96793b42007-09-17 09:57:33 -070084#define ICMPMSG_MIB_MAX __ICMPMSG_MIB_MAX
85struct icmpmsg_mib {
86 unsigned long mibs[ICMPMSG_MIB_MAX];
87} __SNMP_MIB_ALIGN__;
88
Linus Torvalds1da177e2005-04-16 15:20:36 -070089/* ICMP6 (IPv6-ICMP) */
90#define ICMP6_MIB_MAX __ICMP6_MIB_MAX
91struct icmpv6_mib {
92 unsigned long mibs[ICMP6_MIB_MAX];
93} __SNMP_MIB_ALIGN__;
94
David L Stevens14878f72007-09-16 16:52:35 -070095#define ICMP6MSG_MIB_MAX __ICMP6MSG_MIB_MAX
96struct icmpv6msg_mib {
97 unsigned long mibs[ICMP6MSG_MIB_MAX];
98} __SNMP_MIB_ALIGN__;
99
100
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101/* TCP */
102#define TCP_MIB_MAX __TCP_MIB_MAX
103struct tcp_mib {
104 unsigned long mibs[TCP_MIB_MAX];
105} __SNMP_MIB_ALIGN__;
106
107/* UDP */
108#define UDP_MIB_MAX __UDP_MIB_MAX
109struct udp_mib {
110 unsigned long mibs[UDP_MIB_MAX];
111} __SNMP_MIB_ALIGN__;
112
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113/* Linux */
114#define LINUX_MIB_MAX __LINUX_MIB_MAX
115struct linux_mib {
116 unsigned long mibs[LINUX_MIB_MAX];
117};
118
Masahide NAKAMURA558f82e2007-12-20 20:42:57 -0800119/* Linux Xfrm */
120#define LINUX_MIB_XFRMMAX __LINUX_MIB_XFRMMAX
121struct linux_xfrm_mib {
122 unsigned long mibs[LINUX_MIB_XFRMMAX];
123};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124
125/*
126 * FIXME: On x86 and some other CPUs the split into user and softirq parts
127 * is not needed because addl $1,memory is atomic against interrupts (but
128 * atomic_inc would be overkill because of the lock cycles). Wants new
129 * nonlocked_atomic_inc() primitives -AK
130 */
131#define DEFINE_SNMP_STAT(type, name) \
Tejun Heo7d720c32010-02-16 15:20:26 +0000132 __typeof__(type) __percpu *name[2]
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133#define DECLARE_SNMP_STAT(type, name) \
Tejun Heo7d720c32010-02-16 15:20:26 +0000134 extern __typeof__(type) __percpu *name[2]
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135
136#define SNMP_STAT_BHPTR(name) (name[0])
137#define SNMP_STAT_USRPTR(name) (name[1])
138
Christoph Lameter4eb41d12009-10-03 19:48:22 +0900139#define SNMP_INC_STATS_BH(mib, field) \
140 __this_cpu_inc(mib[0]->mibs[field])
141#define SNMP_INC_STATS_USER(mib, field) \
142 this_cpu_inc(mib[1]->mibs[field])
143#define SNMP_INC_STATS(mib, field) \
144 this_cpu_inc(mib[!in_softirq()]->mibs[field])
145#define SNMP_DEC_STATS(mib, field) \
146 this_cpu_dec(mib[!in_softirq()]->mibs[field])
147#define SNMP_ADD_STATS_BH(mib, field, addend) \
148 __this_cpu_add(mib[0]->mibs[field], addend)
149#define SNMP_ADD_STATS_USER(mib, field, addend) \
150 this_cpu_add(mib[1]->mibs[field], addend)
Tejun Heo7d720c32010-02-16 15:20:26 +0000151/*
152 * Use "__typeof__(*mib[0]) *ptr" instead of "__typeof__(mib[0]) ptr"
153 * to make @ptr a non-percpu pointer.
154 */
Neil Hormanedf391f2009-04-27 02:45:02 -0700155#define SNMP_UPD_PO_STATS(mib, basefield, addend) \
156 do { \
Tejun Heo7d720c32010-02-16 15:20:26 +0000157 __typeof__(*mib[0]) *ptr; \
Christoph Lameter4eb41d12009-10-03 19:48:22 +0900158 preempt_disable(); \
159 ptr = this_cpu_ptr((mib)[!in_softirq()]); \
Neil Hormanedf391f2009-04-27 02:45:02 -0700160 ptr->mibs[basefield##PKTS]++; \
161 ptr->mibs[basefield##OCTETS] += addend;\
Christoph Lameter4eb41d12009-10-03 19:48:22 +0900162 preempt_enable(); \
Neil Hormanedf391f2009-04-27 02:45:02 -0700163 } while (0)
164#define SNMP_UPD_PO_STATS_BH(mib, basefield, addend) \
165 do { \
Tejun Heo7d720c32010-02-16 15:20:26 +0000166 __typeof__(*mib[0]) *ptr = \
Christoph Lameter4eb41d12009-10-03 19:48:22 +0900167 __this_cpu_ptr((mib)[!in_softirq()]); \
Neil Hormanedf391f2009-04-27 02:45:02 -0700168 ptr->mibs[basefield##PKTS]++; \
169 ptr->mibs[basefield##OCTETS] += addend;\
170 } while (0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171#endif