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git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - include/net/snmp.h
3 * SNMP MIB entries for the IP subsystem.
5 * Alan Cox <gw4pts@gw4pts.ampr.org>
7 * We don't chose to implement SNMP in the kernel (this would
8 * be silly as SNMP is a pain in the backside in places). We do
9 * however need to collect the MIB statistics and export them
10 * out of /proc (eventually)
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version
15 * 2 of the License, or (at your option) any later version.
22 #include <linux/cache.h>
23 #include <linux/snmp.h>
24 #include <linux/smp.h>
27 * Mibs are stored in array of unsigned long.
31 * - list of entries for particular API (such as /proc/net/snmp)
39 #define SNMP_MIB_ITEM(_name,_entry) { \
44 #define SNMP_MIB_SENTINEL { \
50 * We use all unsigned longs. Linux will soon be so reliable that even
51 * these will rapidly get too small 8-). Seriously consider the IpInReceives
52 * count on the 20Gb/s + networks people expect in a few years time!
56 * The rule for padding:
57 * Best is power of two because then the right structure can be found by a
58 * simple shift. The structure should be always cache line aligned.
59 * gcc needs n=alignto(cachelinesize, popcnt(sizeof(bla_mib))) shift/add
60 * instructions to emulate multiply in case it is not power-of-two.
61 * Currently n is always <=3 for all sizes so simple cache line alignment
64 * The best solution would be a global CPU local area , especially on 64
65 * and 128byte cacheline machine it makes a *lot* of sense -AK
68 #define __SNMP_MIB_ALIGN__ ____cacheline_aligned
71 #define IPSTATS_MIB_MAX __IPSTATS_MIB_MAX
73 unsigned long mibs
[IPSTATS_MIB_MAX
];
77 #define ICMP_MIB_DUMMY __ICMP_MIB_MAX
78 #define ICMP_MIB_MAX (__ICMP_MIB_MAX + 1)
81 unsigned long mibs
[ICMP_MIB_MAX
];
84 #define ICMPMSG_MIB_MAX __ICMPMSG_MIB_MAX
86 unsigned long mibs
[ICMPMSG_MIB_MAX
];
89 /* ICMP6 (IPv6-ICMP) */
90 #define ICMP6_MIB_MAX __ICMP6_MIB_MAX
92 unsigned long mibs
[ICMP6_MIB_MAX
];
95 #define ICMP6MSG_MIB_MAX __ICMP6MSG_MIB_MAX
96 struct icmpv6msg_mib
{
97 unsigned long mibs
[ICMP6MSG_MIB_MAX
];
102 #define TCP_MIB_MAX __TCP_MIB_MAX
104 unsigned long mibs
[TCP_MIB_MAX
];
105 } __SNMP_MIB_ALIGN__
;
108 #define UDP_MIB_MAX __UDP_MIB_MAX
110 unsigned long mibs
[UDP_MIB_MAX
];
111 } __SNMP_MIB_ALIGN__
;
114 #define LINUX_MIB_MAX __LINUX_MIB_MAX
116 unsigned long mibs
[LINUX_MIB_MAX
];
120 #define LINUX_MIB_XFRMMAX __LINUX_MIB_XFRMMAX
121 struct linux_xfrm_mib
{
122 unsigned long mibs
[LINUX_MIB_XFRMMAX
];
126 * FIXME: On x86 and some other CPUs the split into user and softirq parts
127 * is not needed because addl $1,memory is atomic against interrupts (but
128 * atomic_inc would be overkill because of the lock cycles). Wants new
129 * nonlocked_atomic_inc() primitives -AK
131 #define DEFINE_SNMP_STAT(type, name) \
132 __typeof__(type) *name[2]
133 #define DECLARE_SNMP_STAT(type, name) \
134 extern __typeof__(type) *name[2]
136 #define SNMP_STAT_BHPTR(name) (name[0])
137 #define SNMP_STAT_USRPTR(name) (name[1])
139 #define SNMP_INC_STATS_BH(mib, field) \
140 (per_cpu_ptr(mib[0], raw_smp_processor_id())->mibs[field]++)
141 #define SNMP_INC_STATS_USER(mib, field) \
143 per_cpu_ptr(mib[1], get_cpu())->mibs[field]++; \
146 #define SNMP_INC_STATS(mib, field) \
148 per_cpu_ptr(mib[!in_softirq()], get_cpu())->mibs[field]++; \
151 #define SNMP_DEC_STATS(mib, field) \
153 per_cpu_ptr(mib[!in_softirq()], get_cpu())->mibs[field]--; \
156 #define SNMP_ADD_STATS(mib, field, addend) \
158 per_cpu_ptr(mib[!in_softirq()], get_cpu())->mibs[field] += addend; \
161 #define SNMP_ADD_STATS_BH(mib, field, addend) \
162 (per_cpu_ptr(mib[0], raw_smp_processor_id())->mibs[field] += addend)
163 #define SNMP_ADD_STATS_USER(mib, field, addend) \
165 per_cpu_ptr(mib[1], get_cpu())->mibs[field] += addend; \
168 #define SNMP_UPD_PO_STATS(mib, basefield, addend) \
170 __typeof__(mib[0]) ptr = per_cpu_ptr(mib[!in_softirq()], get_cpu());\
171 ptr->mibs[basefield##PKTS]++; \
172 ptr->mibs[basefield##OCTETS] += addend;\
175 #define SNMP_UPD_PO_STATS_BH(mib, basefield, addend) \
177 __typeof__(mib[0]) ptr = per_cpu_ptr(mib[!in_softirq()], raw_smp_processor_id());\
178 ptr->mibs[basefield##PKTS]++; \
179 ptr->mibs[basefield##OCTETS] += addend;\