3 * SNMP MIB entries for the IP subsystem.
5 * Alan Cox <gw4pts@gw4pts.ampr.org>
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)
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.
17 * $Id: snmp.h,v 1.19 2001/06/14 13:40:46 davem Exp $
24 #include <linux/cache.h>
25 #include <linux/snmp.h>
26 #include <linux/smp.h>
29 * Mibs are stored in array of unsigned long.
33 * - list of entries for particular API (such as /proc/net/snmp)
41 #define SNMP_MIB_ITEM(_name,_entry) { \
46 #define SNMP_MIB_SENTINEL { \
52 * We use all unsigned longs. Linux will soon be so reliable that even
53 * these will rapidly get too small 8-). Seriously consider the IpInReceives
54 * count on the 20Gb/s + networks people expect in a few years time!
58 * The rule for padding:
59 * Best is power of two because then the right structure can be found by a
60 * simple shift. The structure should be always cache line aligned.
61 * gcc needs n=alignto(cachelinesize, popcnt(sizeof(bla_mib))) shift/add
62 * instructions to emulate multiply in case it is not power-of-two.
63 * Currently n is always <=3 for all sizes so simple cache line alignment
66 * The best solution would be a global CPU local area , especially on 64
67 * and 128byte cacheline machine it makes a *lot* of sense -AK
70 #define __SNMP_MIB_ALIGN__ ____cacheline_aligned
73 #define IPSTATS_MIB_MAX __IPSTATS_MIB_MAX
75 unsigned long mibs[IPSTATS_MIB_MAX];
79 #define ICMP_MIB_DUMMY __ICMP_MIB_MAX
80 #define ICMP_MIB_MAX (__ICMP_MIB_MAX + 1)
83 unsigned long mibs[ICMP_MIB_MAX];
86 #define ICMPMSG_MIB_MAX __ICMPMSG_MIB_MAX
88 unsigned long mibs[ICMPMSG_MIB_MAX];
91 /* ICMP6 (IPv6-ICMP) */
92 #define ICMP6_MIB_MAX __ICMP6_MIB_MAX
94 unsigned long mibs[ICMP6_MIB_MAX];
97 #define ICMP6MSG_MIB_MAX __ICMP6MSG_MIB_MAX
98 struct icmpv6msg_mib {
99 unsigned long mibs[ICMP6MSG_MIB_MAX];
100 } __SNMP_MIB_ALIGN__;
104 #define TCP_MIB_MAX __TCP_MIB_MAX
106 unsigned long mibs[TCP_MIB_MAX];
107 } __SNMP_MIB_ALIGN__;
110 #define UDP_MIB_MAX __UDP_MIB_MAX
112 unsigned long mibs[UDP_MIB_MAX];
113 } __SNMP_MIB_ALIGN__;
116 #define LINUX_MIB_MAX __LINUX_MIB_MAX
118 unsigned long mibs[LINUX_MIB_MAX];
122 #define LINUX_MIB_XFRMMAX __LINUX_MIB_XFRMMAX
123 struct linux_xfrm_mib {
124 unsigned long mibs[LINUX_MIB_XFRMMAX];
128 * FIXME: On x86 and some other CPUs the split into user and softirq parts
129 * is not needed because addl $1,memory is atomic against interrupts (but
130 * atomic_inc would be overkill because of the lock cycles). Wants new
131 * nonlocked_atomic_inc() primitives -AK
133 #define DEFINE_SNMP_STAT(type, name) \
134 __typeof__(type) *name[2]
135 #define DECLARE_SNMP_STAT(type, name) \
136 extern __typeof__(type) *name[2]
138 #define SNMP_STAT_BHPTR(name) (name[0])
139 #define SNMP_STAT_USRPTR(name) (name[1])
141 #define SNMP_INC_STATS_BH(mib, field) \
142 (per_cpu_ptr(mib[0], raw_smp_processor_id())->mibs[field]++)
143 #define SNMP_INC_STATS_USER(mib, field) \
145 per_cpu_ptr(mib[1], get_cpu())->mibs[field]++; \
148 #define SNMP_INC_STATS(mib, field) \
150 per_cpu_ptr(mib[!in_softirq()], get_cpu())->mibs[field]++; \
153 #define SNMP_DEC_STATS(mib, field) \
155 per_cpu_ptr(mib[!in_softirq()], get_cpu())->mibs[field]--; \
158 #define SNMP_ADD_STATS_BH(mib, field, addend) \
159 (per_cpu_ptr(mib[0], raw_smp_processor_id())->mibs[field] += addend)
160 #define SNMP_ADD_STATS_USER(mib, field, addend) \
162 per_cpu_ptr(mib[1], get_cpu())->mibs[field] += addend; \