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SNMP mibs use two percpu arrays, one used in BH context, another in USER context. With increasing number of cpus in machines, and fact that ipv6 uses per network device ipstats_mib, this is consuming a lot of memory if many network devices are registered. commitbe281e554e(ipv6: reduce per device ICMP mib sizes) shrinked percpu needs for ipv6, but we can reduce memory use a bit more. With recent percpu infrastructure (irqsafe_cpu_inc() ...), we no longer need this BH/USER separation since we can update counters in a single x86 instruction, regardless of the BH/USER context. Other arches than x86 might need to disable irq in their irqsafe_cpu_inc() implementation : If this happens to be a problem, we can make SNMP_ARRAY_SZ arch dependent, but a previous poll ( https://lkml.org/lkml/2011/3/17/174 ) to arch maintainers did not raise strong opposition. Only on 32bit arches, we need to disable BH for 64bit counters updates done from USER context (currently used for IP MIB) This also reduces vmlinux size : 1) x86_64 build $ size vmlinux.before vmlinux.after text data bss dec hex filename 785365012937721896448 11043870 a8841e vmlinux.before 785057812937721896448 11040798 a8781e vmlinux.after 2) i386 build $ size vmlinux.before vmlinux.afterpatch text data bss dec hex filename 6039335 635076 3670016 10344427 9dd7eb vmlinux.before 6037342 635076 3670016 10342434 9dd022 vmlinux.afterpatch Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> CC: Andi Kleen <andi@firstfloor.org> CC: Ingo Molnar <mingo@elte.hu> CC: Tejun Heo <tj@kernel.org> CC: Christoph Lameter <cl@linux-foundation.org> CC: Benjamin Herrenschmidt <benh@kernel.crashing.org CC: linux-arch@vger.kernel.org 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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unsigned long 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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unsigned long 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 SNMP_ARRAY_SZ 1
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#define DEFINE_SNMP_STAT(type, name) \
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__typeof__(type) __percpu *name[SNMP_ARRAY_SZ]
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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[SNMP_ARRAY_SZ]
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#define SNMP_INC_STATS_BH(mib, field) \
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__this_cpu_inc(mib[0]->mibs[field])
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#define SNMP_INC_STATS_USER(mib, field) \
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irqsafe_cpu_inc(mib[0]->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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irqsafe_cpu_inc(mib[0]->mibs[field])
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#define SNMP_DEC_STATS(mib, field) \
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irqsafe_cpu_dec(mib[0]->mibs[field])
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#define SNMP_ADD_STATS_BH(mib, field, addend) \
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__this_cpu_add(mib[0]->mibs[field], addend)
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#define SNMP_ADD_STATS_USER(mib, field, addend) \
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irqsafe_cpu_add(mib[0]->mibs[field], addend)
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#define SNMP_ADD_STATS(mib, field, addend) \
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irqsafe_cpu_add(mib[0]->mibs[field], addend)
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/*
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* Use "__typeof__(*mib[0]) *ptr" instead of "__typeof__(mib[0]) 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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irqsafe_cpu_inc(mib[0]->mibs[basefield##PKTS]); \
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irqsafe_cpu_add(mib[0]->mibs[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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__this_cpu_inc(mib[0]->mibs[basefield##PKTS]); \
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__this_cpu_add(mib[0]->mibs[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[0]) *ptr = __this_cpu_ptr((mib)[0]); \
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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[0]) *ptr; \
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ptr = __this_cpu_ptr((mib)[0]); \
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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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