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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 | 99 | |
22e0f8b9 JF |
100 | static void |
101 | __gnet_stats_copy_basic_cpu(struct gnet_stats_basic_packed *bstats, | |
102 | struct gnet_stats_basic_cpu __percpu *cpu) | |
103 | { | |
104 | int i; | |
105 | ||
106 | for_each_possible_cpu(i) { | |
107 | struct gnet_stats_basic_cpu *bcpu = per_cpu_ptr(cpu, i); | |
108 | unsigned int start; | |
109 | __u64 bytes; | |
110 | __u32 packets; | |
111 | ||
112 | do { | |
113 | start = u64_stats_fetch_begin_irq(&bcpu->syncp); | |
114 | bytes = bcpu->bstats.bytes; | |
115 | packets = bcpu->bstats.packets; | |
116 | } while (u64_stats_fetch_retry_irq(&bcpu->syncp, start)); | |
117 | ||
118 | bstats->bytes += bcpu->bstats.bytes; | |
119 | bstats->packets += bcpu->bstats.packets; | |
120 | } | |
121 | } | |
122 | ||
123 | void | |
124 | __gnet_stats_copy_basic(struct gnet_stats_basic_packed *bstats, | |
125 | struct gnet_stats_basic_cpu __percpu *cpu, | |
126 | struct gnet_stats_basic_packed *b) | |
127 | { | |
128 | if (cpu) { | |
129 | __gnet_stats_copy_basic_cpu(bstats, cpu); | |
130 | } else { | |
131 | bstats->bytes = b->bytes; | |
132 | bstats->packets = b->packets; | |
133 | } | |
134 | } | |
135 | EXPORT_SYMBOL(__gnet_stats_copy_basic); | |
136 | ||
1da177e4 LT |
137 | /** |
138 | * gnet_stats_copy_basic - copy basic statistics into statistic TLV | |
139 | * @d: dumping handle | |
140 | * @b: basic statistics | |
141 | * | |
142 | * Appends the basic statistics to the top level TLV created by | |
143 | * gnet_stats_start_copy(). | |
144 | * | |
145 | * Returns 0 on success or -1 with the statistic lock released | |
146 | * if the room in the socket buffer was not sufficient. | |
147 | */ | |
148 | int | |
22e0f8b9 JF |
149 | gnet_stats_copy_basic(struct gnet_dump *d, |
150 | struct gnet_stats_basic_cpu __percpu *cpu, | |
151 | struct gnet_stats_basic_packed *b) | |
1da177e4 | 152 | { |
22e0f8b9 JF |
153 | struct gnet_stats_basic_packed bstats = {0}; |
154 | ||
155 | __gnet_stats_copy_basic(&bstats, cpu, b); | |
156 | ||
1da177e4 | 157 | if (d->compat_tc_stats) { |
22e0f8b9 JF |
158 | d->tc_stats.bytes = bstats.bytes; |
159 | d->tc_stats.packets = bstats.packets; | |
1da177e4 LT |
160 | } |
161 | ||
c1a8f1f1 ED |
162 | if (d->tail) { |
163 | struct gnet_stats_basic sb; | |
1da177e4 | 164 | |
c1a8f1f1 | 165 | memset(&sb, 0, sizeof(sb)); |
22e0f8b9 JF |
166 | sb.bytes = bstats.bytes; |
167 | sb.packets = bstats.packets; | |
c1a8f1f1 ED |
168 | return gnet_stats_copy(d, TCA_STATS_BASIC, &sb, sizeof(sb)); |
169 | } | |
1da177e4 LT |
170 | return 0; |
171 | } | |
9e34a5b5 | 172 | EXPORT_SYMBOL(gnet_stats_copy_basic); |
1da177e4 LT |
173 | |
174 | /** | |
175 | * gnet_stats_copy_rate_est - copy rate estimator statistics into statistics TLV | |
176 | * @d: dumping handle | |
d250a5f9 | 177 | * @b: basic statistics |
1da177e4 LT |
178 | * @r: rate estimator statistics |
179 | * | |
180 | * Appends the rate estimator 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 | |
d250a5f9 ED |
187 | gnet_stats_copy_rate_est(struct gnet_dump *d, |
188 | const struct gnet_stats_basic_packed *b, | |
45203a3b | 189 | struct gnet_stats_rate_est64 *r) |
1da177e4 | 190 | { |
45203a3b ED |
191 | struct gnet_stats_rate_est est; |
192 | int res; | |
193 | ||
d250a5f9 ED |
194 | if (b && !gen_estimator_active(b, r)) |
195 | return 0; | |
196 | ||
45203a3b ED |
197 | est.bps = min_t(u64, UINT_MAX, r->bps); |
198 | /* we have some time before reaching 2^32 packets per second */ | |
199 | est.pps = r->pps; | |
200 | ||
1da177e4 | 201 | if (d->compat_tc_stats) { |
45203a3b ED |
202 | d->tc_stats.bps = est.bps; |
203 | d->tc_stats.pps = est.pps; | |
1da177e4 LT |
204 | } |
205 | ||
45203a3b ED |
206 | if (d->tail) { |
207 | res = gnet_stats_copy(d, TCA_STATS_RATE_EST, &est, sizeof(est)); | |
208 | if (res < 0 || est.bps == r->bps) | |
209 | return res; | |
210 | /* emit 64bit stats only if needed */ | |
211 | return gnet_stats_copy(d, TCA_STATS_RATE_EST64, r, sizeof(*r)); | |
212 | } | |
1da177e4 LT |
213 | |
214 | return 0; | |
215 | } | |
9e34a5b5 | 216 | EXPORT_SYMBOL(gnet_stats_copy_rate_est); |
1da177e4 | 217 | |
b0ab6f92 JF |
218 | static void |
219 | __gnet_stats_copy_queue_cpu(struct gnet_stats_queue *qstats, | |
220 | const struct gnet_stats_queue __percpu *q) | |
221 | { | |
222 | int i; | |
223 | ||
224 | for_each_possible_cpu(i) { | |
225 | const struct gnet_stats_queue *qcpu = per_cpu_ptr(q, i); | |
226 | ||
227 | qstats->qlen = 0; | |
228 | qstats->backlog += qcpu->backlog; | |
229 | qstats->drops += qcpu->drops; | |
230 | qstats->requeues += qcpu->requeues; | |
231 | qstats->overlimits += qcpu->overlimits; | |
232 | } | |
233 | } | |
234 | ||
235 | static void __gnet_stats_copy_queue(struct gnet_stats_queue *qstats, | |
236 | const struct gnet_stats_queue __percpu *cpu, | |
237 | const struct gnet_stats_queue *q, | |
238 | __u32 qlen) | |
239 | { | |
240 | if (cpu) { | |
241 | __gnet_stats_copy_queue_cpu(qstats, cpu); | |
242 | } else { | |
243 | qstats->qlen = q->qlen; | |
244 | qstats->backlog = q->backlog; | |
245 | qstats->drops = q->drops; | |
246 | qstats->requeues = q->requeues; | |
247 | qstats->overlimits = q->overlimits; | |
248 | } | |
249 | ||
250 | qstats->qlen = qlen; | |
251 | } | |
252 | ||
1da177e4 LT |
253 | /** |
254 | * gnet_stats_copy_queue - copy queue statistics into statistics TLV | |
255 | * @d: dumping handle | |
b0ab6f92 | 256 | * @cpu_q: per cpu queue statistics |
1da177e4 | 257 | * @q: queue statistics |
64015853 | 258 | * @qlen: queue length statistics |
1da177e4 LT |
259 | * |
260 | * Appends the queue statistics to the top level TLV created by | |
b0ab6f92 JF |
261 | * gnet_stats_start_copy(). Using per cpu queue statistics if |
262 | * they are available. | |
1da177e4 LT |
263 | * |
264 | * Returns 0 on success or -1 with the statistic lock released | |
265 | * if the room in the socket buffer was not sufficient. | |
266 | */ | |
267 | int | |
64015853 | 268 | gnet_stats_copy_queue(struct gnet_dump *d, |
b0ab6f92 | 269 | struct gnet_stats_queue __percpu *cpu_q, |
64015853 | 270 | struct gnet_stats_queue *q, __u32 qlen) |
1da177e4 | 271 | { |
b0ab6f92 JF |
272 | struct gnet_stats_queue qstats = {0}; |
273 | ||
274 | __gnet_stats_copy_queue(&qstats, cpu_q, q, qlen); | |
64015853 | 275 | |
1da177e4 | 276 | if (d->compat_tc_stats) { |
b0ab6f92 JF |
277 | d->tc_stats.drops = qstats.drops; |
278 | d->tc_stats.qlen = qstats.qlen; | |
279 | d->tc_stats.backlog = qstats.backlog; | |
280 | d->tc_stats.overlimits = qstats.overlimits; | |
1da177e4 LT |
281 | } |
282 | ||
283 | if (d->tail) | |
b0ab6f92 JF |
284 | return gnet_stats_copy(d, TCA_STATS_QUEUE, |
285 | &qstats, sizeof(qstats)); | |
1da177e4 LT |
286 | |
287 | return 0; | |
288 | } | |
9e34a5b5 | 289 | EXPORT_SYMBOL(gnet_stats_copy_queue); |
1da177e4 LT |
290 | |
291 | /** | |
292 | * gnet_stats_copy_app - copy application specific statistics into statistics TLV | |
293 | * @d: dumping handle | |
294 | * @st: application specific statistics data | |
295 | * @len: length of data | |
296 | * | |
e793c0f7 | 297 | * Appends the application specific statistics to the top level TLV created by |
1da177e4 LT |
298 | * gnet_stats_start_copy() and remembers the data for XSTATS if the dumping |
299 | * handle is in backward compatibility mode. | |
300 | * | |
301 | * Returns 0 on success or -1 with the statistic lock released | |
302 | * if the room in the socket buffer was not sufficient. | |
303 | */ | |
304 | int | |
305 | gnet_stats_copy_app(struct gnet_dump *d, void *st, int len) | |
306 | { | |
307 | if (d->compat_xstats) { | |
308 | d->xstats = st; | |
309 | d->xstats_len = len; | |
310 | } | |
311 | ||
312 | if (d->tail) | |
313 | return gnet_stats_copy(d, TCA_STATS_APP, st, len); | |
314 | ||
315 | return 0; | |
316 | } | |
9e34a5b5 | 317 | EXPORT_SYMBOL(gnet_stats_copy_app); |
1da177e4 LT |
318 | |
319 | /** | |
320 | * gnet_stats_finish_copy - finish dumping procedure | |
321 | * @d: dumping handle | |
322 | * | |
323 | * Corrects the length of the top level TLV to include all TLVs added | |
324 | * by gnet_stats_copy_XXX() calls. Adds the backward compatibility TLVs | |
325 | * if gnet_stats_start_copy_compat() was used and releases the statistics | |
326 | * lock. | |
327 | * | |
328 | * Returns 0 on success or -1 with the statistic lock released | |
329 | * if the room in the socket buffer was not sufficient. | |
330 | */ | |
331 | int | |
332 | gnet_stats_finish_copy(struct gnet_dump *d) | |
333 | { | |
334 | if (d->tail) | |
1e90474c | 335 | d->tail->nla_len = skb_tail_pointer(d->skb) - (u8 *)d->tail; |
1da177e4 LT |
336 | |
337 | if (d->compat_tc_stats) | |
338 | if (gnet_stats_copy(d, d->compat_tc_stats, &d->tc_stats, | |
339 | sizeof(d->tc_stats)) < 0) | |
340 | return -1; | |
341 | ||
342 | if (d->compat_xstats && d->xstats) { | |
343 | if (gnet_stats_copy(d, d->compat_xstats, d->xstats, | |
344 | d->xstats_len) < 0) | |
345 | return -1; | |
346 | } | |
347 | ||
348 | spin_unlock_bh(d->lock); | |
349 | return 0; | |
350 | } | |
1da177e4 | 351 | EXPORT_SYMBOL(gnet_stats_finish_copy); |