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Diffstat (limited to 'include/net/snmp.h')
| -rw-r--r-- | include/net/snmp.h | 237 |
1 files changed, 237 insertions, 0 deletions
diff --git a/include/net/snmp.h b/include/net/snmp.h new file mode 100644 index 00000000..479083a7 --- /dev/null +++ b/include/net/snmp.h @@ -0,0 +1,237 @@ +/* + * + * 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 { + unsigned long 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 { + unsigned long 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]; +}; + +/* + * 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) __percpu *name[2] +#define DEFINE_SNMP_STAT_ATOMIC(type, name) \ + __typeof__(type) *name +#define DECLARE_SNMP_STAT(type, name) \ + extern __typeof__(type) __percpu *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_ATOMIC_LONG(mib, field) \ + atomic_long_inc(&mib->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_ADD_STATS(mib, field, addend) \ + this_cpu_add(mib[!in_softirq()]->mibs[field], addend) +/* + * Use "__typeof__(*mib[0]) *ptr" instead of "__typeof__(mib[0]) ptr" + * to make @ptr a non-percpu pointer. + */ +#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)[0]); \ + ptr->mibs[basefield##PKTS]++; \ + ptr->mibs[basefield##OCTETS] += addend;\ + } while (0) + + +#if BITS_PER_LONG==32 + +#define SNMP_ADD_STATS64_BH(mib, field, addend) \ + do { \ + __typeof__(*mib[0]) *ptr = __this_cpu_ptr((mib)[0]); \ + 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 { \ + __typeof__(*mib[0]) *ptr; \ + preempt_disable(); \ + ptr = __this_cpu_ptr((mib)[1]); \ + u64_stats_update_begin(&ptr->syncp); \ + ptr->mibs[field] += addend; \ + u64_stats_update_end(&ptr->syncp); \ + preempt_enable(); \ + } while (0) +#define SNMP_ADD_STATS64(mib, field, addend) \ + do { \ + __typeof__(*mib[0]) *ptr; \ + preempt_disable(); \ + ptr = __this_cpu_ptr((mib)[!in_softirq()]); \ + u64_stats_update_begin(&ptr->syncp); \ + ptr->mibs[field] += addend; \ + u64_stats_update_end(&ptr->syncp); \ + preempt_enable(); \ + } while (0) +#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(mib, basefield, addend) \ + do { \ + __typeof__(*mib[0]) *ptr; \ + preempt_disable(); \ + ptr = __this_cpu_ptr((mib)[!in_softirq()]); \ + u64_stats_update_begin(&ptr->syncp); \ + ptr->mibs[basefield##PKTS]++; \ + ptr->mibs[basefield##OCTETS] += addend; \ + u64_stats_update_end(&ptr->syncp); \ + preempt_enable(); \ + } while (0) +#define SNMP_UPD_PO_STATS64_BH(mib, basefield, addend) \ + do { \ + __typeof__(*mib[0]) *ptr; \ + ptr = __this_cpu_ptr((mib)[0]); \ + u64_stats_update_begin(&ptr->syncp); \ + ptr->mibs[basefield##PKTS]++; \ + ptr->mibs[basefield##OCTETS] += addend; \ + u64_stats_update_end(&ptr->syncp); \ + } 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 |