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 unsigned longs for most mibs but u64 for ipstats.
52 #include <linux/u64_stats_sync.h>
55 #define IPSTATS_MIB_MAX __IPSTATS_MIB_MAX
57 /* mibs[] must be first field of struct ipstats_mib */
58 u64 mibs[IPSTATS_MIB_MAX];
59 struct u64_stats_sync syncp;
63 #define ICMP_MIB_DUMMY __ICMP_MIB_MAX
64 #define ICMP_MIB_MAX __ICMP_MIB_MAX
66 unsigned long mibs[ICMP_MIB_MAX];
69 #define ICMPMSG_MIB_MAX __ICMPMSG_MIB_MAX
71 unsigned long mibs[ICMPMSG_MIB_MAX];
74 /* ICMP6 (IPv6-ICMP) */
75 #define ICMP6_MIB_MAX __ICMP6_MIB_MAX
77 unsigned long mibs[ICMP6_MIB_MAX];
80 #define ICMP6MSG_MIB_MAX __ICMP6MSG_MIB_MAX
81 struct icmpv6msg_mib {
82 unsigned long mibs[ICMP6MSG_MIB_MAX];
87 #define TCP_MIB_MAX __TCP_MIB_MAX
89 unsigned long mibs[TCP_MIB_MAX];
93 #define UDP_MIB_MAX __UDP_MIB_MAX
95 unsigned long mibs[UDP_MIB_MAX];
99 #define LINUX_MIB_MAX __LINUX_MIB_MAX
101 unsigned long mibs[LINUX_MIB_MAX];
105 #define LINUX_MIB_XFRMMAX __LINUX_MIB_XFRMMAX
106 struct linux_xfrm_mib {
107 unsigned long mibs[LINUX_MIB_XFRMMAX];
111 * FIXME: On x86 and some other CPUs the split into user and softirq parts
112 * is not needed because addl $1,memory is atomic against interrupts (but
113 * atomic_inc would be overkill because of the lock cycles). Wants new
114 * nonlocked_atomic_inc() primitives -AK
116 #define DEFINE_SNMP_STAT(type, name) \
117 __typeof__(type) __percpu *name[2]
118 #define DECLARE_SNMP_STAT(type, name) \
119 extern __typeof__(type) __percpu *name[2]
121 #define SNMP_STAT_BHPTR(name) (name[0])
122 #define SNMP_STAT_USRPTR(name) (name[1])
124 #define SNMP_INC_STATS_BH(mib, field) \
125 __this_cpu_inc(mib[0]->mibs[field])
126 #define SNMP_INC_STATS_USER(mib, field) \
127 this_cpu_inc(mib[1]->mibs[field])
128 #define SNMP_INC_STATS(mib, field) \
129 this_cpu_inc(mib[!in_softirq()]->mibs[field])
130 #define SNMP_DEC_STATS(mib, field) \
131 this_cpu_dec(mib[!in_softirq()]->mibs[field])
132 #define SNMP_ADD_STATS_BH(mib, field, addend) \
133 __this_cpu_add(mib[0]->mibs[field], addend)
134 #define SNMP_ADD_STATS_USER(mib, field, addend) \
135 this_cpu_add(mib[1]->mibs[field], addend)
136 #define SNMP_ADD_STATS(mib, field, addend) \
137 this_cpu_add(mib[!in_softirq()]->mibs[field], addend)
139 * Use "__typeof__(*mib[0]) *ptr" instead of "__typeof__(mib[0]) ptr"
140 * to make @ptr a non-percpu pointer.
142 #define SNMP_UPD_PO_STATS(mib, basefield, addend) \
144 __typeof__(*mib[0]) *ptr; \
146 ptr = this_cpu_ptr((mib)[!in_softirq()]); \
147 ptr->mibs[basefield##PKTS]++; \
148 ptr->mibs[basefield##OCTETS] += addend;\
151 #define SNMP_UPD_PO_STATS_BH(mib, basefield, addend) \
153 __typeof__(*mib[0]) *ptr = \
154 __this_cpu_ptr((mib)[!in_softirq()]); \
155 ptr->mibs[basefield##PKTS]++; \
156 ptr->mibs[basefield##OCTETS] += addend;\
160 #if BITS_PER_LONG==32
162 #define SNMP_ADD_STATS64_BH(mib, field, addend) \
164 __typeof__(*mib[0]) *ptr = __this_cpu_ptr((mib)[0]); \
165 u64_stats_update_begin(&ptr->syncp); \
166 ptr->mibs[field] += addend; \
167 u64_stats_update_end(&ptr->syncp); \
169 #define SNMP_ADD_STATS64_USER(mib, field, addend) \
171 __typeof__(*mib[0]) *ptr; \
173 ptr = __this_cpu_ptr((mib)[1]); \
174 u64_stats_update_begin(&ptr->syncp); \
175 ptr->mibs[field] += addend; \
176 u64_stats_update_end(&ptr->syncp); \
179 #define SNMP_ADD_STATS64(mib, field, addend) \
181 __typeof__(*mib[0]) *ptr; \
183 ptr = __this_cpu_ptr((mib)[!in_softirq()]); \
184 u64_stats_update_begin(&ptr->syncp); \
185 ptr->mibs[field] += addend; \
186 u64_stats_update_end(&ptr->syncp); \
189 #define SNMP_INC_STATS64_BH(mib, field) SNMP_ADD_STATS64_BH(mib, field, 1)
190 #define SNMP_INC_STATS64_USER(mib, field) SNMP_ADD_STATS64_USER(mib, field, 1)
191 #define SNMP_INC_STATS64(mib, field) SNMP_ADD_STATS64(mib, field, 1)
192 #define SNMP_UPD_PO_STATS64(mib, basefield, addend) \
194 __typeof__(*mib[0]) *ptr; \
196 ptr = __this_cpu_ptr((mib)[!in_softirq()]); \
197 u64_stats_update_begin(&ptr->syncp); \
198 ptr->mibs[basefield##PKTS]++; \
199 ptr->mibs[basefield##OCTETS] += addend; \
200 u64_stats_update_end(&ptr->syncp); \
203 #define SNMP_UPD_PO_STATS64_BH(mib, basefield, addend) \
205 __typeof__(*mib[0]) *ptr; \
206 ptr = __this_cpu_ptr((mib)[!in_softirq()]); \
207 u64_stats_update_begin(&ptr->syncp); \
208 ptr->mibs[basefield##PKTS]++; \
209 ptr->mibs[basefield##OCTETS] += addend; \
210 u64_stats_update_end(&ptr->syncp); \
213 #define SNMP_INC_STATS64_BH(mib, field) SNMP_INC_STATS_BH(mib, field)
214 #define SNMP_INC_STATS64_USER(mib, field) SNMP_INC_STATS_USER(mib, field)
215 #define SNMP_INC_STATS64(mib, field) SNMP_INC_STATS(mib, field)
216 #define SNMP_DEC_STATS64(mib, field) SNMP_DEC_STATS(mib, field)
217 #define SNMP_ADD_STATS64_BH(mib, field, addend) SNMP_ADD_STATS_BH(mib, field, addend)
218 #define SNMP_ADD_STATS64_USER(mib, field, addend) SNMP_ADD_STATS_USER(mib, field, addend)
219 #define SNMP_ADD_STATS64(mib, field, addend) SNMP_ADD_STATS(mib, field, addend)
220 #define SNMP_UPD_PO_STATS64(mib, basefield, addend) SNMP_UPD_PO_STATS(mib, basefield, addend)
221 #define SNMP_UPD_PO_STATS64_BH(mib, basefield, addend) SNMP_UPD_PO_STATS_BH(mib, basefield, addend)