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698365fa18
commit8f0ea0fe3a(snmp: reduce percpu needs by 50%) reduced snmp array size to 1, so technically it doesn't have to be an array any more. What's more, after the following commit: commit933393f58fDate: Thu Dec 22 11:58:51 2011 -0600 percpu: Remove irqsafe_cpu_xxx variants We simply say that regular this_cpu use must be safe regardless of preemption and interrupt state. That has no material change for x86 and s390 implementations of this_cpu operations. However, arches that do not provide their own implementation for this_cpu operations will now get code generated that disables interrupts instead of preemption. probably no arch wants to have SNMP_ARRAY_SZ == 2. At least after almost 3 years, no one complains. So, just convert the array to a single pointer and remove snmp_mib_init() and snmp_mib_free() as well. Cc: Christoph Lameter <cl@linux.com> Cc: Eric Dumazet <eric.dumazet@gmail.com> Cc: David S. Miller <davem@davemloft.net> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
218 lines
5.9 KiB
C
218 lines
5.9 KiB
C
/*
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*
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* SNMP MIB entries for the IP subsystem.
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*
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* Alan Cox <gw4pts@gw4pts.ampr.org>
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*
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* We don't chose to implement SNMP in the kernel (this would
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* be silly as SNMP is a pain in the backside in places). We do
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* however need to collect the MIB statistics and export them
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* out of /proc (eventually)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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*/
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#ifndef _SNMP_H
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#define _SNMP_H
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#include <linux/cache.h>
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#include <linux/snmp.h>
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#include <linux/smp.h>
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/*
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* Mibs are stored in array of unsigned long.
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*/
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/*
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* struct snmp_mib{}
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* - list of entries for particular API (such as /proc/net/snmp)
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* - name of entries.
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*/
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struct snmp_mib {
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const char *name;
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int entry;
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};
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#define SNMP_MIB_ITEM(_name,_entry) { \
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.name = _name, \
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.entry = _entry, \
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}
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#define SNMP_MIB_SENTINEL { \
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.name = NULL, \
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.entry = 0, \
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}
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/*
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* We use unsigned longs for most mibs but u64 for ipstats.
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*/
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#include <linux/u64_stats_sync.h>
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/* IPstats */
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#define IPSTATS_MIB_MAX __IPSTATS_MIB_MAX
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struct ipstats_mib {
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/* mibs[] must be first field of struct ipstats_mib */
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u64 mibs[IPSTATS_MIB_MAX];
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struct u64_stats_sync syncp;
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};
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/* ICMP */
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#define ICMP_MIB_MAX __ICMP_MIB_MAX
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struct icmp_mib {
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unsigned long mibs[ICMP_MIB_MAX];
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};
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#define ICMPMSG_MIB_MAX __ICMPMSG_MIB_MAX
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struct icmpmsg_mib {
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atomic_long_t mibs[ICMPMSG_MIB_MAX];
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};
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/* ICMP6 (IPv6-ICMP) */
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#define ICMP6_MIB_MAX __ICMP6_MIB_MAX
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/* per network ns counters */
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struct icmpv6_mib {
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unsigned long mibs[ICMP6_MIB_MAX];
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};
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/* per device counters, (shared on all cpus) */
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struct icmpv6_mib_device {
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atomic_long_t mibs[ICMP6_MIB_MAX];
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};
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#define ICMP6MSG_MIB_MAX __ICMP6MSG_MIB_MAX
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/* per network ns counters */
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struct icmpv6msg_mib {
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atomic_long_t mibs[ICMP6MSG_MIB_MAX];
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};
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/* per device counters, (shared on all cpus) */
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struct icmpv6msg_mib_device {
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atomic_long_t mibs[ICMP6MSG_MIB_MAX];
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};
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/* TCP */
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#define TCP_MIB_MAX __TCP_MIB_MAX
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struct tcp_mib {
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unsigned long mibs[TCP_MIB_MAX];
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};
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/* UDP */
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#define UDP_MIB_MAX __UDP_MIB_MAX
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struct udp_mib {
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unsigned long mibs[UDP_MIB_MAX];
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};
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/* Linux */
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#define LINUX_MIB_MAX __LINUX_MIB_MAX
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struct linux_mib {
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unsigned long mibs[LINUX_MIB_MAX];
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};
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/* Linux Xfrm */
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#define LINUX_MIB_XFRMMAX __LINUX_MIB_XFRMMAX
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struct linux_xfrm_mib {
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unsigned long mibs[LINUX_MIB_XFRMMAX];
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};
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#define DEFINE_SNMP_STAT(type, name) \
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__typeof__(type) __percpu *name
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#define DEFINE_SNMP_STAT_ATOMIC(type, name) \
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__typeof__(type) *name
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#define DECLARE_SNMP_STAT(type, name) \
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extern __typeof__(type) __percpu *name
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#define SNMP_INC_STATS_BH(mib, field) \
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__this_cpu_inc(mib->mibs[field])
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#define SNMP_INC_STATS_USER(mib, field) \
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this_cpu_inc(mib->mibs[field])
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#define SNMP_INC_STATS_ATOMIC_LONG(mib, field) \
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atomic_long_inc(&mib->mibs[field])
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#define SNMP_INC_STATS(mib, field) \
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this_cpu_inc(mib->mibs[field])
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#define SNMP_DEC_STATS(mib, field) \
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this_cpu_dec(mib->mibs[field])
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#define SNMP_ADD_STATS_BH(mib, field, addend) \
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__this_cpu_add(mib->mibs[field], addend)
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#define SNMP_ADD_STATS_USER(mib, field, addend) \
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this_cpu_add(mib->mibs[field], addend)
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#define SNMP_ADD_STATS(mib, field, addend) \
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this_cpu_add(mib->mibs[field], addend)
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/*
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* Use "__typeof__(*mib) *ptr" instead of "__typeof__(mib) ptr"
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* to make @ptr a non-percpu pointer.
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*/
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#define SNMP_UPD_PO_STATS(mib, basefield, addend) \
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do { \
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__typeof__(*mib->mibs) *ptr = mib->mibs; \
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this_cpu_inc(ptr[basefield##PKTS]); \
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this_cpu_add(ptr[basefield##OCTETS], addend); \
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} while (0)
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#define SNMP_UPD_PO_STATS_BH(mib, basefield, addend) \
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do { \
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__typeof__(*mib->mibs) *ptr = mib->mibs; \
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__this_cpu_inc(ptr[basefield##PKTS]); \
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__this_cpu_add(ptr[basefield##OCTETS], addend); \
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} while (0)
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#if BITS_PER_LONG==32
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#define SNMP_ADD_STATS64_BH(mib, field, addend) \
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do { \
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__typeof__(*mib) *ptr = __this_cpu_ptr(mib); \
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u64_stats_update_begin(&ptr->syncp); \
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ptr->mibs[field] += addend; \
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u64_stats_update_end(&ptr->syncp); \
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} while (0)
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#define SNMP_ADD_STATS64_USER(mib, field, addend) \
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do { \
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local_bh_disable(); \
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SNMP_ADD_STATS64_BH(mib, field, addend); \
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local_bh_enable(); \
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} while (0)
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#define SNMP_ADD_STATS64(mib, field, addend) \
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SNMP_ADD_STATS64_USER(mib, field, addend)
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#define SNMP_INC_STATS64_BH(mib, field) SNMP_ADD_STATS64_BH(mib, field, 1)
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#define SNMP_INC_STATS64_USER(mib, field) SNMP_ADD_STATS64_USER(mib, field, 1)
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#define SNMP_INC_STATS64(mib, field) SNMP_ADD_STATS64(mib, field, 1)
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#define SNMP_UPD_PO_STATS64_BH(mib, basefield, addend) \
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do { \
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__typeof__(*mib) *ptr; \
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ptr = __this_cpu_ptr(mib); \
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u64_stats_update_begin(&ptr->syncp); \
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ptr->mibs[basefield##PKTS]++; \
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ptr->mibs[basefield##OCTETS] += addend; \
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u64_stats_update_end(&ptr->syncp); \
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} while (0)
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#define SNMP_UPD_PO_STATS64(mib, basefield, addend) \
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do { \
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local_bh_disable(); \
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SNMP_UPD_PO_STATS64_BH(mib, basefield, addend); \
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local_bh_enable(); \
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} while (0)
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#else
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#define SNMP_INC_STATS64_BH(mib, field) SNMP_INC_STATS_BH(mib, field)
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#define SNMP_INC_STATS64_USER(mib, field) SNMP_INC_STATS_USER(mib, field)
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#define SNMP_INC_STATS64(mib, field) SNMP_INC_STATS(mib, field)
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#define SNMP_DEC_STATS64(mib, field) SNMP_DEC_STATS(mib, field)
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#define SNMP_ADD_STATS64_BH(mib, field, addend) SNMP_ADD_STATS_BH(mib, field, addend)
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#define SNMP_ADD_STATS64_USER(mib, field, addend) SNMP_ADD_STATS_USER(mib, field, addend)
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#define SNMP_ADD_STATS64(mib, field, addend) SNMP_ADD_STATS(mib, field, addend)
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#define SNMP_UPD_PO_STATS64(mib, basefield, addend) SNMP_UPD_PO_STATS(mib, basefield, addend)
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#define SNMP_UPD_PO_STATS64_BH(mib, basefield, addend) SNMP_UPD_PO_STATS_BH(mib, basefield, addend)
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#endif
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#endif
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