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 #include <linux/smp.h> 27 28 /* 29 * Mibs are stored in array of unsigned long. 30 */ 31 /* 32 * struct snmp_mib{} 33 * - list of entries for particular API (such as /proc/net/snmp) 34 * - name of entries. 35 */ 36 struct snmp_mib { 37 char *name; 38 int entry; 39 }; 40 41 #define SNMP_MIB_ITEM(_name,_entry) { \ 42 .name = _name, \ 43 .entry = _entry, \ 44 } 45 46 #define SNMP_MIB_SENTINEL { \ 47 .name = NULL, \ 48 .entry = 0, \ 49 } 50 51 /* 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! 55 */ 56 57 /* 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 64 * is enough. 65 * 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 68 */ 69 70 #define __SNMP_MIB_ALIGN__ ____cacheline_aligned 71 72 /* IPstats */ 73 #define IPSTATS_MIB_MAX __IPSTATS_MIB_MAX 74 struct ipstats_mib { 75 unsigned long mibs[IPSTATS_MIB_MAX]; 76 } __SNMP_MIB_ALIGN__; 77 78 /* ICMP */ 79 #define ICMP_MIB_DUMMY __ICMP_MIB_MAX 80 #define ICMP_MIB_MAX (__ICMP_MIB_MAX + 1) 81 82 struct icmp_mib { 83 unsigned long mibs[ICMP_MIB_MAX]; 84 } __SNMP_MIB_ALIGN__; 85 86 #define ICMPMSG_MIB_MAX __ICMPMSG_MIB_MAX 87 struct icmpmsg_mib { 88 unsigned long mibs[ICMPMSG_MIB_MAX]; 89 } __SNMP_MIB_ALIGN__; 90 91 /* ICMP6 (IPv6-ICMP) */ 92 #define ICMP6_MIB_MAX __ICMP6_MIB_MAX 93 struct icmpv6_mib { 94 unsigned long mibs[ICMP6_MIB_MAX]; 95 } __SNMP_MIB_ALIGN__; 96 97 #define ICMP6MSG_MIB_MAX __ICMP6MSG_MIB_MAX 98 struct icmpv6msg_mib { 99 unsigned long mibs[ICMP6MSG_MIB_MAX]; 100 } __SNMP_MIB_ALIGN__; 101 102 103 /* TCP */ 104 #define TCP_MIB_MAX __TCP_MIB_MAX 105 struct tcp_mib { 106 unsigned long mibs[TCP_MIB_MAX]; 107 } __SNMP_MIB_ALIGN__; 108 109 /* UDP */ 110 #define UDP_MIB_MAX __UDP_MIB_MAX 111 struct udp_mib { 112 unsigned long mibs[UDP_MIB_MAX]; 113 } __SNMP_MIB_ALIGN__; 114 115 /* Linux */ 116 #define LINUX_MIB_MAX __LINUX_MIB_MAX 117 struct linux_mib { 118 unsigned long mibs[LINUX_MIB_MAX]; 119 }; 120 121 /* Linux Xfrm */ 122 #define LINUX_MIB_XFRMMAX __LINUX_MIB_XFRMMAX 123 struct linux_xfrm_mib { 124 unsigned long mibs[LINUX_MIB_XFRMMAX]; 125 }; 126 127 /* 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 132 */ 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] 137 138 #define SNMP_STAT_BHPTR(name) (name[0]) 139 #define SNMP_STAT_USRPTR(name) (name[1]) 140 141 #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) \ 144 do { \ 145 per_cpu_ptr(mib[1], get_cpu())->mibs[field]++; \ 146 put_cpu(); \ 147 } while (0) 148 #define SNMP_INC_STATS(mib, field) \ 149 do { \ 150 per_cpu_ptr(mib[!in_softirq()], get_cpu())->mibs[field]++; \ 151 put_cpu(); \ 152 } while (0) 153 #define SNMP_DEC_STATS(mib, field) \ 154 do { \ 155 per_cpu_ptr(mib[!in_softirq()], get_cpu())->mibs[field]--; \ 156 put_cpu(); \ 157 } while (0) 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) \ 161 do { \ 162 per_cpu_ptr(mib[1], get_cpu())->mibs[field] += addend; \ 163 put_cpu(); \ 164 } while (0) 165 166 #endif 167