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Diffstat (limited to 'include/net/snmp.h')
| -rw-r--r-- | include/net/snmp.h | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/include/net/snmp.h b/include/net/snmp.h new file mode 100644 index 0000000..a15ab25 --- /dev/null +++ b/include/net/snmp.h @@ -0,0 +1,145 @@ +/* + * + * 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 |