include/net/snmp.h

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/*
 *
 *              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 {
        const char *name;
        int entry;
};

#define SNMP_MIB_ITEM(_name,_entry)     {       \
        .name = _name,                          \
        .entry = _entry,                        \
}

#define SNMP_MIB_SENTINEL {     \
        .name = NULL,           \
        .entry = 0,             \
}

/*
 * We use unsigned longs for most mibs but u64 for ipstats.
 */
#include <linux/u64_stats_sync.h>

/* IPstats */
#define IPSTATS_MIB_MAX __IPSTATS_MIB_MAX
struct ipstats_mib {
        /* mibs[] must be first field of struct ipstats_mib */
        u64             mibs[IPSTATS_MIB_MAX];
        struct u64_stats_sync syncp;
};

/* ICMP */
#define ICMP_MIB_MAX    __ICMP_MIB_MAX
struct icmp_mib {
        unsigned long   mibs[ICMP_MIB_MAX];
};

#define ICMPMSG_MIB_MAX __ICMPMSG_MIB_MAX
struct icmpmsg_mib {
        atomic_long_t   mibs[ICMPMSG_MIB_MAX];
};

/* ICMP6 (IPv6-ICMP) */
#define ICMP6_MIB_MAX   __ICMP6_MIB_MAX
/* per network ns counters */
struct icmpv6_mib {
        unsigned long   mibs[ICMP6_MIB_MAX];
};
/* per device counters, (shared on all cpus) */
struct icmpv6_mib_device {
        atomic_long_t   mibs[ICMP6_MIB_MAX];
};

#define ICMP6MSG_MIB_MAX  __ICMP6MSG_MIB_MAX
/* per network ns counters */
struct icmpv6msg_mib {
        atomic_long_t   mibs[ICMP6MSG_MIB_MAX];
};
/* per device counters, (shared on all cpus) */
struct icmpv6msg_mib_device {
        atomic_long_t   mibs[ICMP6MSG_MIB_MAX];
};


/* TCP */
#define TCP_MIB_MAX     __TCP_MIB_MAX
struct tcp_mib {
        unsigned long   mibs[TCP_MIB_MAX];
};

/* UDP */
#define UDP_MIB_MAX     __UDP_MIB_MAX
struct udp_mib {
        unsigned long   mibs[UDP_MIB_MAX];
};

/* 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];
};

#define DEFINE_SNMP_STAT(type, name)    \
        __typeof__(type) __percpu *name
#define DEFINE_SNMP_STAT_ATOMIC(type, name)     \
        __typeof__(type) *name
#define DECLARE_SNMP_STAT(type, name)   \
        extern __typeof__(type) __percpu *name

#define SNMP_INC_STATS_BH(mib, field)   \
                        __this_cpu_inc(mib->mibs[field])

#define SNMP_INC_STATS_USER(mib, field) \
                        this_cpu_inc(mib->mibs[field])

#define SNMP_INC_STATS_ATOMIC_LONG(mib, field)  \
                        atomic_long_inc(&mib->mibs[field])

#define SNMP_INC_STATS(mib, field)      \
                        this_cpu_inc(mib->mibs[field])

#define SNMP_DEC_STATS(mib, field)      \
                        this_cpu_dec(mib->mibs[field])

#define SNMP_ADD_STATS_BH(mib, field, addend)   \
                        __this_cpu_add(mib->mibs[field], addend)

#define SNMP_ADD_STATS_USER(mib, field, addend) \
                        this_cpu_add(mib->mibs[field], addend)

#define SNMP_ADD_STATS(mib, field, addend)      \
                        this_cpu_add(mib->mibs[field], addend)
#define SNMP_UPD_PO_STATS(mib, basefield, addend)       \
        do { \
                __typeof__((mib->mibs) + 0) ptr = mib->mibs;    \
                this_cpu_inc(ptr[basefield##PKTS]);             \
                this_cpu_add(ptr[basefield##OCTETS], addend);   \
        } while (0)
#define SNMP_UPD_PO_STATS_BH(mib, basefield, addend)    \
        do { \
                __typeof__((mib->mibs) + 0) ptr = mib->mibs;    \
                __this_cpu_inc(ptr[basefield##PKTS]);           \
                __this_cpu_add(ptr[basefield##OCTETS], addend); \
        } while (0)


#if BITS_PER_LONG==32

#define SNMP_ADD_STATS64_BH(mib, field, addend)                         \
        do {                                                            \
                __typeof__(*mib) *ptr = raw_cpu_ptr(mib);               \
                u64_stats_update_begin(&ptr->syncp);                    \
                ptr->mibs[field] += addend;                             \
                u64_stats_update_end(&ptr->syncp);                      \
        } while (0)

#define SNMP_ADD_STATS64_USER(mib, field, addend)                       \
        do {                                                            \
                local_bh_disable();                                     \
                SNMP_ADD_STATS64_BH(mib, field, addend);                \
                local_bh_enable();                                      \
        } while (0)

#define SNMP_ADD_STATS64(mib, field, addend)                            \
                SNMP_ADD_STATS64_USER(mib, field, addend)

#define SNMP_INC_STATS64_BH(mib, field) SNMP_ADD_STATS64_BH(mib, field, 1)
#define SNMP_INC_STATS64_USER(mib, field) SNMP_ADD_STATS64_USER(mib, field, 1)
#define SNMP_INC_STATS64(mib, field) SNMP_ADD_STATS64(mib, field, 1)
#define SNMP_UPD_PO_STATS64_BH(mib, basefield, addend)                  \
        do {                                                            \
                __typeof__(*mib) *ptr;                          \
                ptr = raw_cpu_ptr((mib));                               \
                u64_stats_update_begin(&ptr->syncp);                    \
                ptr->mibs[basefield##PKTS]++;                           \
                ptr->mibs[basefield##OCTETS] += addend;                 \
                u64_stats_update_end(&ptr->syncp);                      \
        } while (0)
#define SNMP_UPD_PO_STATS64(mib, basefield, addend)                     \
        do {                                                            \
                local_bh_disable();                                     \
                SNMP_UPD_PO_STATS64_BH(mib, basefield, addend);         \
                local_bh_enable();                                      \
        } while (0)
#else
#define SNMP_INC_STATS64_BH(mib, field)         SNMP_INC_STATS_BH(mib, field)
#define SNMP_INC_STATS64_USER(mib, field)       SNMP_INC_STATS_USER(mib, field)
#define SNMP_INC_STATS64(mib, field)            SNMP_INC_STATS(mib, field)
#define SNMP_DEC_STATS64(mib, field)            SNMP_DEC_STATS(mib, field)
#define SNMP_ADD_STATS64_BH(mib, field, addend) SNMP_ADD_STATS_BH(mib, field, addend)
#define SNMP_ADD_STATS64_USER(mib, field, addend) SNMP_ADD_STATS_USER(mib, field, addend)
#define SNMP_ADD_STATS64(mib, field, addend)    SNMP_ADD_STATS(mib, field, addend)
#define SNMP_UPD_PO_STATS64(mib, basefield, addend) SNMP_UPD_PO_STATS(mib, basefield, addend)
#define SNMP_UPD_PO_STATS64_BH(mib, basefield, addend) SNMP_UPD_PO_STATS_BH(mib, basefield, addend)
#endif

#endif
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root/include/net/snmp.h

INCLUDED FROM
