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1da177e4 LT |
1 | /* |
2 | * | |
3 | * SNMP MIB entries for the IP subsystem. | |
4 | * | |
5 | * Alan Cox <gw4pts@gw4pts.ampr.org> | |
6 | * | |
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) | |
11 | * | |
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. | |
16 | * | |
1da177e4 LT |
17 | */ |
18 | ||
19 | #ifndef _SNMP_H | |
20 | #define _SNMP_H | |
21 | ||
22 | #include <linux/cache.h> | |
23 | #include <linux/snmp.h> | |
d647b36a | 24 | #include <linux/smp.h> |
1da177e4 LT |
25 | |
26 | /* | |
27 | * Mibs are stored in array of unsigned long. | |
28 | */ | |
29 | /* | |
30 | * struct snmp_mib{} | |
31 | * - list of entries for particular API (such as /proc/net/snmp) | |
32 | * - name of entries. | |
33 | */ | |
34 | struct snmp_mib { | |
35 | char *name; | |
36 | int entry; | |
37 | }; | |
38 | ||
39 | #define SNMP_MIB_ITEM(_name,_entry) { \ | |
40 | .name = _name, \ | |
41 | .entry = _entry, \ | |
42 | } | |
43 | ||
44 | #define SNMP_MIB_SENTINEL { \ | |
45 | .name = NULL, \ | |
46 | .entry = 0, \ | |
47 | } | |
48 | ||
49 | /* | |
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! | |
53 | */ | |
54 | ||
55 | /* | |
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 | |
62 | * is enough. | |
63 | * | |
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 | |
66 | */ | |
67 | ||
68 | #define __SNMP_MIB_ALIGN__ ____cacheline_aligned | |
69 | ||
70 | /* IPstats */ | |
71 | #define IPSTATS_MIB_MAX __IPSTATS_MIB_MAX | |
72 | struct ipstats_mib { | |
73 | unsigned long mibs[IPSTATS_MIB_MAX]; | |
74 | } __SNMP_MIB_ALIGN__; | |
75 | ||
76 | /* ICMP */ | |
77 | #define ICMP_MIB_DUMMY __ICMP_MIB_MAX | |
78 | #define ICMP_MIB_MAX (__ICMP_MIB_MAX + 1) | |
79 | ||
80 | struct icmp_mib { | |
81 | unsigned long mibs[ICMP_MIB_MAX]; | |
82 | } __SNMP_MIB_ALIGN__; | |
83 | ||
96793b48 DS |
84 | #define ICMPMSG_MIB_MAX __ICMPMSG_MIB_MAX |
85 | struct icmpmsg_mib { | |
86 | unsigned long mibs[ICMPMSG_MIB_MAX]; | |
87 | } __SNMP_MIB_ALIGN__; | |
88 | ||
1da177e4 LT |
89 | /* ICMP6 (IPv6-ICMP) */ |
90 | #define ICMP6_MIB_MAX __ICMP6_MIB_MAX | |
91 | struct icmpv6_mib { | |
92 | unsigned long mibs[ICMP6_MIB_MAX]; | |
93 | } __SNMP_MIB_ALIGN__; | |
94 | ||
14878f75 DS |
95 | #define ICMP6MSG_MIB_MAX __ICMP6MSG_MIB_MAX |
96 | struct icmpv6msg_mib { | |
97 | unsigned long mibs[ICMP6MSG_MIB_MAX]; | |
98 | } __SNMP_MIB_ALIGN__; | |
99 | ||
100 | ||
1da177e4 LT |
101 | /* TCP */ |
102 | #define TCP_MIB_MAX __TCP_MIB_MAX | |
103 | struct tcp_mib { | |
104 | unsigned long mibs[TCP_MIB_MAX]; | |
105 | } __SNMP_MIB_ALIGN__; | |
106 | ||
107 | /* UDP */ | |
108 | #define UDP_MIB_MAX __UDP_MIB_MAX | |
109 | struct udp_mib { | |
110 | unsigned long mibs[UDP_MIB_MAX]; | |
111 | } __SNMP_MIB_ALIGN__; | |
112 | ||
1da177e4 LT |
113 | /* Linux */ |
114 | #define LINUX_MIB_MAX __LINUX_MIB_MAX | |
115 | struct linux_mib { | |
116 | unsigned long mibs[LINUX_MIB_MAX]; | |
117 | }; | |
118 | ||
558f82ef MN |
119 | /* Linux Xfrm */ |
120 | #define LINUX_MIB_XFRMMAX __LINUX_MIB_XFRMMAX | |
121 | struct linux_xfrm_mib { | |
122 | unsigned long mibs[LINUX_MIB_XFRMMAX]; | |
123 | }; | |
1da177e4 LT |
124 | |
125 | /* | |
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 | |
130 | */ | |
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] | |
135 | ||
136 | #define SNMP_STAT_BHPTR(name) (name[0]) | |
137 | #define SNMP_STAT_USRPTR(name) (name[1]) | |
138 | ||
4eb41d10 CL |
139 | #define SNMP_INC_STATS_BH(mib, field) \ |
140 | __this_cpu_inc(mib[0]->mibs[field]) | |
141 | #define SNMP_INC_STATS_USER(mib, field) \ | |
142 | this_cpu_inc(mib[1]->mibs[field]) | |
143 | #define SNMP_INC_STATS(mib, field) \ | |
144 | this_cpu_inc(mib[!in_softirq()]->mibs[field]) | |
145 | #define SNMP_DEC_STATS(mib, field) \ | |
146 | this_cpu_dec(mib[!in_softirq()]->mibs[field]) | |
147 | #define SNMP_ADD_STATS_BH(mib, field, addend) \ | |
148 | __this_cpu_add(mib[0]->mibs[field], addend) | |
149 | #define SNMP_ADD_STATS_USER(mib, field, addend) \ | |
150 | this_cpu_add(mib[1]->mibs[field], addend) | |
edf391ff NH |
151 | #define SNMP_UPD_PO_STATS(mib, basefield, addend) \ |
152 | do { \ | |
4eb41d10 CL |
153 | __typeof__(mib[0]) ptr; \ |
154 | preempt_disable(); \ | |
155 | ptr = this_cpu_ptr((mib)[!in_softirq()]); \ | |
edf391ff NH |
156 | ptr->mibs[basefield##PKTS]++; \ |
157 | ptr->mibs[basefield##OCTETS] += addend;\ | |
4eb41d10 | 158 | preempt_enable(); \ |
edf391ff NH |
159 | } while (0) |
160 | #define SNMP_UPD_PO_STATS_BH(mib, basefield, addend) \ | |
161 | do { \ | |
4eb41d10 CL |
162 | __typeof__(mib[0]) ptr = \ |
163 | __this_cpu_ptr((mib)[!in_softirq()]); \ | |
edf391ff NH |
164 | ptr->mibs[basefield##PKTS]++; \ |
165 | ptr->mibs[basefield##OCTETS] += addend;\ | |
166 | } while (0) | |
1da177e4 | 167 | #endif |