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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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4eb41d10c7
SNMP statistic macros can be signficantly simplified. This will also reduce code size if the arch supports these operations in hardware. Acked-by: Tejun Heo <tj@kernel.org> Signed-off-by: Christoph Lameter <cl@linux-foundation.org> Signed-off-by: Tejun Heo <tj@kernel.org>
168 lines
4.5 KiB
C
168 lines
4.5 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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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 all unsigned longs. Linux will soon be so reliable that even
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* these will rapidly get too small 8-). Seriously consider the IpInReceives
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* count on the 20Gb/s + networks people expect in a few years time!
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*/
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/*
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* The rule for padding:
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* Best is power of two because then the right structure can be found by a
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* simple shift. The structure should be always cache line aligned.
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* gcc needs n=alignto(cachelinesize, popcnt(sizeof(bla_mib))) shift/add
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* instructions to emulate multiply in case it is not power-of-two.
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* Currently n is always <=3 for all sizes so simple cache line alignment
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* is enough.
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*
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* The best solution would be a global CPU local area , especially on 64
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* and 128byte cacheline machine it makes a *lot* of sense -AK
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*/
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#define __SNMP_MIB_ALIGN__ ____cacheline_aligned
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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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unsigned long mibs[IPSTATS_MIB_MAX];
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} __SNMP_MIB_ALIGN__;
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/* ICMP */
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#define ICMP_MIB_DUMMY __ICMP_MIB_MAX
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#define ICMP_MIB_MAX (__ICMP_MIB_MAX + 1)
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struct icmp_mib {
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unsigned long mibs[ICMP_MIB_MAX];
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} __SNMP_MIB_ALIGN__;
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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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} __SNMP_MIB_ALIGN__;
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/* ICMP6 (IPv6-ICMP) */
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#define ICMP6_MIB_MAX __ICMP6_MIB_MAX
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struct icmpv6_mib {
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unsigned long mibs[ICMP6_MIB_MAX];
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} __SNMP_MIB_ALIGN__;
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#define ICMP6MSG_MIB_MAX __ICMP6MSG_MIB_MAX
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struct icmpv6msg_mib {
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unsigned long mibs[ICMP6MSG_MIB_MAX];
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} __SNMP_MIB_ALIGN__;
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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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} __SNMP_MIB_ALIGN__;
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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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} __SNMP_MIB_ALIGN__;
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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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/*
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* FIXME: On x86 and some other CPUs the split into user and softirq parts
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* is not needed because addl $1,memory is atomic against interrupts (but
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* atomic_inc would be overkill because of the lock cycles). Wants new
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* nonlocked_atomic_inc() primitives -AK
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*/
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#define DEFINE_SNMP_STAT(type, name) \
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__typeof__(type) *name[2]
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#define DECLARE_SNMP_STAT(type, name) \
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extern __typeof__(type) *name[2]
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#define SNMP_STAT_BHPTR(name) (name[0])
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#define SNMP_STAT_USRPTR(name) (name[1])
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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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this_cpu_inc(mib[1]->mibs[field])
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#define SNMP_INC_STATS(mib, field) \
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this_cpu_inc(mib[!in_softirq()]->mibs[field])
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#define SNMP_DEC_STATS(mib, field) \
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this_cpu_dec(mib[!in_softirq()]->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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this_cpu_add(mib[1]->mibs[field], addend)
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#define SNMP_UPD_PO_STATS(mib, basefield, addend) \
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do { \
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__typeof__(mib[0]) ptr; \
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preempt_disable(); \
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ptr = this_cpu_ptr((mib)[!in_softirq()]); \
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ptr->mibs[basefield##PKTS]++; \
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ptr->mibs[basefield##OCTETS] += addend;\
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preempt_enable(); \
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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[0]) ptr = \
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__this_cpu_ptr((mib)[!in_softirq()]); \
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ptr->mibs[basefield##PKTS]++; \
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ptr->mibs[basefield##OCTETS] += addend;\
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} while (0)
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#endif
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