| /* |
| * |
| * SNMP MIB entries for the IP subsystem. |
| * |
| * Alan Cox <gw4pts@gw4pts.ampr.org> |
| * |
| * We don't chose to implement SNMP in the kernel (this would |
| * be silly as SNMP is a pain in the backside in places). We do |
| * however need to collect the MIB statistics and export them |
| * out of /proc (eventually) |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version |
| * 2 of the License, or (at your option) any later version. |
| * |
| * $Id: snmp.h,v 1.19 2001/06/14 13:40:46 davem Exp $ |
| * |
| */ |
| |
| #ifndef _SNMP_H |
| #define _SNMP_H |
| |
| #include <linux/cache.h> |
| #include <linux/snmp.h> |
| |
| /* |
| * Mibs are stored in array of unsigned long. |
| */ |
| /* |
| * struct snmp_mib{} |
| * - list of entries for particular API (such as /proc/net/snmp) |
| * - name of entries. |
| */ |
| struct snmp_mib { |
| char *name; |
| int entry; |
| }; |
| |
| #define SNMP_MIB_ITEM(_name,_entry) { \ |
| .name = _name, \ |
| .entry = _entry, \ |
| } |
| |
| #define SNMP_MIB_SENTINEL { \ |
| .name = NULL, \ |
| .entry = 0, \ |
| } |
| |
| /* |
| * We use all unsigned longs. Linux will soon be so reliable that even |
| * these will rapidly get too small 8-). Seriously consider the IpInReceives |
| * count on the 20Gb/s + networks people expect in a few years time! |
| */ |
| |
| /* |
| * The rule for padding: |
| * Best is power of two because then the right structure can be found by a |
| * simple shift. The structure should be always cache line aligned. |
| * gcc needs n=alignto(cachelinesize, popcnt(sizeof(bla_mib))) shift/add |
| * instructions to emulate multiply in case it is not power-of-two. |
| * Currently n is always <=3 for all sizes so simple cache line alignment |
| * is enough. |
| * |
| * The best solution would be a global CPU local area , especially on 64 |
| * and 128byte cacheline machine it makes a *lot* of sense -AK |
| */ |
| |
| #define __SNMP_MIB_ALIGN__ ____cacheline_aligned |
| |
| /* IPstats */ |
| #define IPSTATS_MIB_MAX __IPSTATS_MIB_MAX |
| struct ipstats_mib { |
| unsigned long mibs[IPSTATS_MIB_MAX]; |
| } __SNMP_MIB_ALIGN__; |
| |
| /* ICMP */ |
| #define ICMP_MIB_DUMMY __ICMP_MIB_MAX |
| #define ICMP_MIB_MAX (__ICMP_MIB_MAX + 1) |
| |
| struct icmp_mib { |
| unsigned long mibs[ICMP_MIB_MAX]; |
| } __SNMP_MIB_ALIGN__; |
| |
| /* ICMP6 (IPv6-ICMP) */ |
| #define ICMP6_MIB_MAX __ICMP6_MIB_MAX |
| struct icmpv6_mib { |
| unsigned long mibs[ICMP6_MIB_MAX]; |
| } __SNMP_MIB_ALIGN__; |
| |
| /* TCP */ |
| #define TCP_MIB_MAX __TCP_MIB_MAX |
| struct tcp_mib { |
| unsigned long mibs[TCP_MIB_MAX]; |
| } __SNMP_MIB_ALIGN__; |
| |
| /* UDP */ |
| #define UDP_MIB_MAX __UDP_MIB_MAX |
| struct udp_mib { |
| unsigned long mibs[UDP_MIB_MAX]; |
| } __SNMP_MIB_ALIGN__; |
| |
| /* SCTP */ |
| #define SCTP_MIB_MAX __SCTP_MIB_MAX |
| struct sctp_mib { |
| unsigned long mibs[SCTP_MIB_MAX]; |
| } __SNMP_MIB_ALIGN__; |
| |
| /* Linux */ |
| #define LINUX_MIB_MAX __LINUX_MIB_MAX |
| struct linux_mib { |
| unsigned long mibs[LINUX_MIB_MAX]; |
| }; |
| |
| |
| /* |
| * FIXME: On x86 and some other CPUs the split into user and softirq parts |
| * is not needed because addl $1,memory is atomic against interrupts (but |
| * atomic_inc would be overkill because of the lock cycles). Wants new |
| * nonlocked_atomic_inc() primitives -AK |
| */ |
| #define DEFINE_SNMP_STAT(type, name) \ |
| __typeof__(type) *name[2] |
| #define DECLARE_SNMP_STAT(type, name) \ |
| extern __typeof__(type) *name[2] |
| |
| #define SNMP_STAT_BHPTR(name) (name[0]) |
| #define SNMP_STAT_USRPTR(name) (name[1]) |
| |
| #define SNMP_INC_STATS_BH(mib, field) \ |
| (per_cpu_ptr(mib[0], _smp_processor_id())->mibs[field]++) |
| #define SNMP_INC_STATS_OFFSET_BH(mib, field, offset) \ |
| (per_cpu_ptr(mib[0], _smp_processor_id())->mibs[field + (offset)]++) |
| #define SNMP_INC_STATS_USER(mib, field) \ |
| (per_cpu_ptr(mib[1], _smp_processor_id())->mibs[field]++) |
| #define SNMP_INC_STATS(mib, field) \ |
| (per_cpu_ptr(mib[!in_softirq()], _smp_processor_id())->mibs[field]++) |
| #define SNMP_DEC_STATS(mib, field) \ |
| (per_cpu_ptr(mib[!in_softirq()], _smp_processor_id())->mibs[field]--) |
| #define SNMP_ADD_STATS_BH(mib, field, addend) \ |
| (per_cpu_ptr(mib[0], _smp_processor_id())->mibs[field] += addend) |
| #define SNMP_ADD_STATS_USER(mib, field, addend) \ |
| (per_cpu_ptr(mib[1], _smp_processor_id())->mibs[field] += addend) |
| |
| #endif |