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1da177e4 LT |
1 | /* |
2 | * net/core/gen_stats.c | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version | |
7 | * 2 of the License, or (at your option) any later version. | |
8 | * | |
9 | * Authors: Thomas Graf <tgraf@suug.ch> | |
10 | * Jamal Hadi Salim | |
11 | * Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> | |
12 | * | |
13 | * See Documentation/networking/gen_stats.txt | |
14 | */ | |
15 | ||
16 | #include <linux/types.h> | |
17 | #include <linux/kernel.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/interrupt.h> | |
20 | #include <linux/socket.h> | |
21 | #include <linux/rtnetlink.h> | |
22 | #include <linux/gen_stats.h> | |
1e90474c | 23 | #include <net/netlink.h> |
1da177e4 LT |
24 | #include <net/gen_stats.h> |
25 | ||
26 | ||
27 | static inline int | |
28 | gnet_stats_copy(struct gnet_dump *d, int type, void *buf, int size) | |
29 | { | |
14ad6647 DM |
30 | if (nla_put(d->skb, type, size, buf)) |
31 | goto nla_put_failure; | |
1da177e4 LT |
32 | return 0; |
33 | ||
1e90474c | 34 | nla_put_failure: |
1da177e4 LT |
35 | spin_unlock_bh(d->lock); |
36 | return -1; | |
37 | } | |
38 | ||
39 | /** | |
40 | * gnet_stats_start_copy_compat - start dumping procedure in compatibility mode | |
41 | * @skb: socket buffer to put statistics TLVs into | |
42 | * @type: TLV type for top level statistic TLV | |
43 | * @tc_stats_type: TLV type for backward compatibility struct tc_stats TLV | |
44 | * @xstats_type: TLV type for backward compatibility xstats TLV | |
45 | * @lock: statistics lock | |
46 | * @d: dumping handle | |
47 | * | |
48 | * Initializes the dumping handle, grabs the statistic lock and appends | |
49 | * an empty TLV header to the socket buffer for use a container for all | |
50 | * other statistic TLVS. | |
51 | * | |
52 | * The dumping handle is marked to be in backward compatibility mode telling | |
53 | * all gnet_stats_copy_XXX() functions to fill a local copy of struct tc_stats. | |
54 | * | |
55 | * Returns 0 on success or -1 if the room in the socket buffer was not sufficient. | |
56 | */ | |
57 | int | |
58 | gnet_stats_start_copy_compat(struct sk_buff *skb, int type, int tc_stats_type, | |
59 | int xstats_type, spinlock_t *lock, struct gnet_dump *d) | |
9a429c49 | 60 | __acquires(lock) |
1da177e4 LT |
61 | { |
62 | memset(d, 0, sizeof(*d)); | |
4ec93edb | 63 | |
1da177e4 LT |
64 | spin_lock_bh(lock); |
65 | d->lock = lock; | |
66 | if (type) | |
1e90474c | 67 | d->tail = (struct nlattr *)skb_tail_pointer(skb); |
1da177e4 LT |
68 | d->skb = skb; |
69 | d->compat_tc_stats = tc_stats_type; | |
70 | d->compat_xstats = xstats_type; | |
71 | ||
72 | if (d->tail) | |
73 | return gnet_stats_copy(d, type, NULL, 0); | |
74 | ||
75 | return 0; | |
76 | } | |
9e34a5b5 | 77 | EXPORT_SYMBOL(gnet_stats_start_copy_compat); |
1da177e4 LT |
78 | |
79 | /** | |
80 | * gnet_stats_start_copy_compat - start dumping procedure in compatibility mode | |
81 | * @skb: socket buffer to put statistics TLVs into | |
82 | * @type: TLV type for top level statistic TLV | |
83 | * @lock: statistics lock | |
84 | * @d: dumping handle | |
85 | * | |
86 | * Initializes the dumping handle, grabs the statistic lock and appends | |
87 | * an empty TLV header to the socket buffer for use a container for all | |
88 | * other statistic TLVS. | |
89 | * | |
90 | * Returns 0 on success or -1 if the room in the socket buffer was not sufficient. | |
91 | */ | |
92 | int | |
93 | gnet_stats_start_copy(struct sk_buff *skb, int type, spinlock_t *lock, | |
94 | struct gnet_dump *d) | |
95 | { | |
96 | return gnet_stats_start_copy_compat(skb, type, 0, 0, lock, d); | |
97 | } | |
9e34a5b5 | 98 | EXPORT_SYMBOL(gnet_stats_start_copy); |
1da177e4 LT |
99 | |
100 | /** | |
101 | * gnet_stats_copy_basic - copy basic statistics into statistic TLV | |
102 | * @d: dumping handle | |
103 | * @b: basic statistics | |
104 | * | |
105 | * Appends the basic statistics to the top level TLV created by | |
106 | * gnet_stats_start_copy(). | |
107 | * | |
108 | * Returns 0 on success or -1 with the statistic lock released | |
109 | * if the room in the socket buffer was not sufficient. | |
110 | */ | |
111 | int | |
c1a8f1f1 | 112 | gnet_stats_copy_basic(struct gnet_dump *d, struct gnet_stats_basic_packed *b) |
1da177e4 LT |
113 | { |
114 | if (d->compat_tc_stats) { | |
115 | d->tc_stats.bytes = b->bytes; | |
116 | d->tc_stats.packets = b->packets; | |
117 | } | |
118 | ||
c1a8f1f1 ED |
119 | if (d->tail) { |
120 | struct gnet_stats_basic sb; | |
1da177e4 | 121 | |
c1a8f1f1 ED |
122 | memset(&sb, 0, sizeof(sb)); |
123 | sb.bytes = b->bytes; | |
124 | sb.packets = b->packets; | |
125 | return gnet_stats_copy(d, TCA_STATS_BASIC, &sb, sizeof(sb)); | |
126 | } | |
1da177e4 LT |
127 | return 0; |
128 | } | |
9e34a5b5 | 129 | EXPORT_SYMBOL(gnet_stats_copy_basic); |
1da177e4 LT |
130 | |
131 | /** | |
132 | * gnet_stats_copy_rate_est - copy rate estimator statistics into statistics TLV | |
133 | * @d: dumping handle | |
d250a5f9 | 134 | * @b: basic statistics |
1da177e4 LT |
135 | * @r: rate estimator statistics |
136 | * | |
137 | * Appends the rate estimator statistics to the top level TLV created by | |
138 | * gnet_stats_start_copy(). | |
139 | * | |
140 | * Returns 0 on success or -1 with the statistic lock released | |
141 | * if the room in the socket buffer was not sufficient. | |
142 | */ | |
143 | int | |
d250a5f9 ED |
144 | gnet_stats_copy_rate_est(struct gnet_dump *d, |
145 | const struct gnet_stats_basic_packed *b, | |
45203a3b | 146 | struct gnet_stats_rate_est64 *r) |
1da177e4 | 147 | { |
45203a3b ED |
148 | struct gnet_stats_rate_est est; |
149 | int res; | |
150 | ||
d250a5f9 ED |
151 | if (b && !gen_estimator_active(b, r)) |
152 | return 0; | |
153 | ||
45203a3b ED |
154 | est.bps = min_t(u64, UINT_MAX, r->bps); |
155 | /* we have some time before reaching 2^32 packets per second */ | |
156 | est.pps = r->pps; | |
157 | ||
1da177e4 | 158 | if (d->compat_tc_stats) { |
45203a3b ED |
159 | d->tc_stats.bps = est.bps; |
160 | d->tc_stats.pps = est.pps; | |
1da177e4 LT |
161 | } |
162 | ||
45203a3b ED |
163 | if (d->tail) { |
164 | res = gnet_stats_copy(d, TCA_STATS_RATE_EST, &est, sizeof(est)); | |
165 | if (res < 0 || est.bps == r->bps) | |
166 | return res; | |
167 | /* emit 64bit stats only if needed */ | |
168 | return gnet_stats_copy(d, TCA_STATS_RATE_EST64, r, sizeof(*r)); | |
169 | } | |
1da177e4 LT |
170 | |
171 | return 0; | |
172 | } | |
9e34a5b5 | 173 | EXPORT_SYMBOL(gnet_stats_copy_rate_est); |
1da177e4 LT |
174 | |
175 | /** | |
176 | * gnet_stats_copy_queue - copy queue statistics into statistics TLV | |
177 | * @d: dumping handle | |
178 | * @q: queue statistics | |
179 | * | |
180 | * Appends the queue statistics to the top level TLV created by | |
181 | * gnet_stats_start_copy(). | |
182 | * | |
183 | * Returns 0 on success or -1 with the statistic lock released | |
184 | * if the room in the socket buffer was not sufficient. | |
185 | */ | |
186 | int | |
187 | gnet_stats_copy_queue(struct gnet_dump *d, struct gnet_stats_queue *q) | |
188 | { | |
189 | if (d->compat_tc_stats) { | |
190 | d->tc_stats.drops = q->drops; | |
191 | d->tc_stats.qlen = q->qlen; | |
192 | d->tc_stats.backlog = q->backlog; | |
193 | d->tc_stats.overlimits = q->overlimits; | |
194 | } | |
195 | ||
196 | if (d->tail) | |
197 | return gnet_stats_copy(d, TCA_STATS_QUEUE, q, sizeof(*q)); | |
198 | ||
199 | return 0; | |
200 | } | |
9e34a5b5 | 201 | EXPORT_SYMBOL(gnet_stats_copy_queue); |
1da177e4 LT |
202 | |
203 | /** | |
204 | * gnet_stats_copy_app - copy application specific statistics into statistics TLV | |
205 | * @d: dumping handle | |
206 | * @st: application specific statistics data | |
207 | * @len: length of data | |
208 | * | |
209 | * Appends the application sepecific statistics to the top level TLV created by | |
210 | * gnet_stats_start_copy() and remembers the data for XSTATS if the dumping | |
211 | * handle is in backward compatibility mode. | |
212 | * | |
213 | * Returns 0 on success or -1 with the statistic lock released | |
214 | * if the room in the socket buffer was not sufficient. | |
215 | */ | |
216 | int | |
217 | gnet_stats_copy_app(struct gnet_dump *d, void *st, int len) | |
218 | { | |
219 | if (d->compat_xstats) { | |
220 | d->xstats = st; | |
221 | d->xstats_len = len; | |
222 | } | |
223 | ||
224 | if (d->tail) | |
225 | return gnet_stats_copy(d, TCA_STATS_APP, st, len); | |
226 | ||
227 | return 0; | |
228 | } | |
9e34a5b5 | 229 | EXPORT_SYMBOL(gnet_stats_copy_app); |
1da177e4 LT |
230 | |
231 | /** | |
232 | * gnet_stats_finish_copy - finish dumping procedure | |
233 | * @d: dumping handle | |
234 | * | |
235 | * Corrects the length of the top level TLV to include all TLVs added | |
236 | * by gnet_stats_copy_XXX() calls. Adds the backward compatibility TLVs | |
237 | * if gnet_stats_start_copy_compat() was used and releases the statistics | |
238 | * lock. | |
239 | * | |
240 | * Returns 0 on success or -1 with the statistic lock released | |
241 | * if the room in the socket buffer was not sufficient. | |
242 | */ | |
243 | int | |
244 | gnet_stats_finish_copy(struct gnet_dump *d) | |
245 | { | |
246 | if (d->tail) | |
1e90474c | 247 | d->tail->nla_len = skb_tail_pointer(d->skb) - (u8 *)d->tail; |
1da177e4 LT |
248 | |
249 | if (d->compat_tc_stats) | |
250 | if (gnet_stats_copy(d, d->compat_tc_stats, &d->tc_stats, | |
251 | sizeof(d->tc_stats)) < 0) | |
252 | return -1; | |
253 | ||
254 | if (d->compat_xstats && d->xstats) { | |
255 | if (gnet_stats_copy(d, d->compat_xstats, d->xstats, | |
256 | d->xstats_len) < 0) | |
257 | return -1; | |
258 | } | |
259 | ||
260 | spin_unlock_bh(d->lock); | |
261 | return 0; | |
262 | } | |
1da177e4 | 263 | EXPORT_SYMBOL(gnet_stats_finish_copy); |