168 lines
4.5 KiB
C
168 lines
4.5 KiB
C
/*
|
|
*
|
|
* 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.
|
|
*
|
|
*/
|
|
|
|
#ifndef _SNMP_H
|
|
#define _SNMP_H
|
|
|
|
#include <linux/cache.h>
|
|
#include <linux/snmp.h>
|
|
#include <linux/smp.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__;
|
|
|
|
#define ICMPMSG_MIB_MAX __ICMPMSG_MIB_MAX
|
|
struct icmpmsg_mib {
|
|
unsigned long mibs[ICMPMSG_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__;
|
|
|
|
#define ICMP6MSG_MIB_MAX __ICMP6MSG_MIB_MAX
|
|
struct icmpv6msg_mib {
|
|
unsigned long mibs[ICMP6MSG_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__;
|
|
|
|
/* Linux */
|
|
#define LINUX_MIB_MAX __LINUX_MIB_MAX
|
|
struct linux_mib {
|
|
unsigned long mibs[LINUX_MIB_MAX];
|
|
};
|
|
|
|
/* Linux Xfrm */
|
|
#define LINUX_MIB_XFRMMAX __LINUX_MIB_XFRMMAX
|
|
struct linux_xfrm_mib {
|
|
unsigned long mibs[LINUX_MIB_XFRMMAX];
|
|
};
|
|
|
|
/*
|
|
* 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) \
|
|
__this_cpu_inc(mib[0]->mibs[field])
|
|
#define SNMP_INC_STATS_USER(mib, field) \
|
|
this_cpu_inc(mib[1]->mibs[field])
|
|
#define SNMP_INC_STATS(mib, field) \
|
|
this_cpu_inc(mib[!in_softirq()]->mibs[field])
|
|
#define SNMP_DEC_STATS(mib, field) \
|
|
this_cpu_dec(mib[!in_softirq()]->mibs[field])
|
|
#define SNMP_ADD_STATS_BH(mib, field, addend) \
|
|
__this_cpu_add(mib[0]->mibs[field], addend)
|
|
#define SNMP_ADD_STATS_USER(mib, field, addend) \
|
|
this_cpu_add(mib[1]->mibs[field], addend)
|
|
#define SNMP_UPD_PO_STATS(mib, basefield, addend) \
|
|
do { \
|
|
__typeof__(mib[0]) ptr; \
|
|
preempt_disable(); \
|
|
ptr = this_cpu_ptr((mib)[!in_softirq()]); \
|
|
ptr->mibs[basefield##PKTS]++; \
|
|
ptr->mibs[basefield##OCTETS] += addend;\
|
|
preempt_enable(); \
|
|
} while (0)
|
|
#define SNMP_UPD_PO_STATS_BH(mib, basefield, addend) \
|
|
do { \
|
|
__typeof__(mib[0]) ptr = \
|
|
__this_cpu_ptr((mib)[!in_softirq()]); \
|
|
ptr->mibs[basefield##PKTS]++; \
|
|
ptr->mibs[basefield##OCTETS] += addend;\
|
|
} while (0)
|
|
#endif
|