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 */ 35 struct 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 73 struct 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 81 struct icmp_mib { 82 unsigned long mibs[ICMP_MIB_MAX]; 83 } __SNMP_MIB_ALIGN__; 84 85 #define ICMPMSG_MIB_MAX __ICMPMSG_MIB_MAX 86 struct icmpmsg_mib { 87 unsigned long mibs[ICMPMSG_MIB_MAX]; 88 } __SNMP_MIB_ALIGN__; 89 90 /* ICMP6 (IPv6-ICMP) */ 91 #define ICMP6_MIB_MAX __ICMP6_MIB_MAX 92 struct icmpv6_mib { 93 unsigned long mibs[ICMP6_MIB_MAX]; 94 } __SNMP_MIB_ALIGN__; 95 96 #define ICMP6MSG_MIB_MAX __ICMP6MSG_MIB_MAX 97 struct icmpv6msg_mib { 98 unsigned long mibs[ICMP6MSG_MIB_MAX]; 99 } __SNMP_MIB_ALIGN__; 100 101 102 /* TCP */ 103 #define TCP_MIB_MAX __TCP_MIB_MAX 104 struct tcp_mib { 105 unsigned long mibs[TCP_MIB_MAX]; 106 } __SNMP_MIB_ALIGN__; 107 108 /* UDP */ 109 #define UDP_MIB_MAX __UDP_MIB_MAX 110 struct udp_mib { 111 unsigned long mibs[UDP_MIB_MAX]; 112 } __SNMP_MIB_ALIGN__; 113 114 /* Linux */ 115 #define LINUX_MIB_MAX __LINUX_MIB_MAX 116 struct linux_mib { 117 unsigned long mibs[LINUX_MIB_MAX]; 118 }; 119 120 121 /* 122 * FIXME: On x86 and some other CPUs the split into user and softirq parts 123 * is not needed because addl $1,memory is atomic against interrupts (but 124 * atomic_inc would be overkill because of the lock cycles). Wants new 125 * nonlocked_atomic_inc() primitives -AK 126 */ 127 #define DEFINE_SNMP_STAT(type, name) \ 128 __typeof__(type) *name[2] 129 #define DECLARE_SNMP_STAT(type, name) \ 130 extern __typeof__(type) *name[2] 131 132 #define SNMP_STAT_BHPTR(name) (name[0]) 133 #define SNMP_STAT_USRPTR(name) (name[1]) 134 135 #define SNMP_INC_STATS_BH(mib, field) \ 136 (per_cpu_ptr(mib[0], raw_smp_processor_id())->mibs[field]++) 137 #define SNMP_INC_STATS_OFFSET_BH(mib, field, offset) \ 138 (per_cpu_ptr(mib[0], raw_smp_processor_id())->mibs[field + (offset)]++) 139 #define SNMP_INC_STATS_USER(mib, field) \ 140 (per_cpu_ptr(mib[1], raw_smp_processor_id())->mibs[field]++) 141 #define SNMP_INC_STATS(mib, field) \ 142 (per_cpu_ptr(mib[!in_softirq()], raw_smp_processor_id())->mibs[field]++) 143 #define SNMP_DEC_STATS(mib, field) \ 144 (per_cpu_ptr(mib[!in_softirq()], raw_smp_processor_id())->mibs[field]--) 145 #define SNMP_ADD_STATS_BH(mib, field, addend) \ 146 (per_cpu_ptr(mib[0], raw_smp_processor_id())->mibs[field] += addend) 147 #define SNMP_ADD_STATS_USER(mib, field, addend) \ 148 (per_cpu_ptr(mib[1], raw_smp_processor_id())->mibs[field] += addend) 149 150 #endif 151