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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: |
1c4cff0c IG |
35 | kfree(d->xstats); |
36 | d->xstats = NULL; | |
37 | d->xstats_len = 0; | |
1da177e4 LT |
38 | spin_unlock_bh(d->lock); |
39 | return -1; | |
40 | } | |
41 | ||
42 | /** | |
43 | * gnet_stats_start_copy_compat - start dumping procedure in compatibility mode | |
44 | * @skb: socket buffer to put statistics TLVs into | |
45 | * @type: TLV type for top level statistic TLV | |
46 | * @tc_stats_type: TLV type for backward compatibility struct tc_stats TLV | |
47 | * @xstats_type: TLV type for backward compatibility xstats TLV | |
48 | * @lock: statistics lock | |
49 | * @d: dumping handle | |
50 | * | |
51 | * Initializes the dumping handle, grabs the statistic lock and appends | |
52 | * an empty TLV header to the socket buffer for use a container for all | |
53 | * other statistic TLVS. | |
54 | * | |
55 | * The dumping handle is marked to be in backward compatibility mode telling | |
56 | * all gnet_stats_copy_XXX() functions to fill a local copy of struct tc_stats. | |
57 | * | |
58 | * Returns 0 on success or -1 if the room in the socket buffer was not sufficient. | |
59 | */ | |
60 | int | |
61 | gnet_stats_start_copy_compat(struct sk_buff *skb, int type, int tc_stats_type, | |
62 | int xstats_type, spinlock_t *lock, struct gnet_dump *d) | |
9a429c49 | 63 | __acquires(lock) |
1da177e4 LT |
64 | { |
65 | memset(d, 0, sizeof(*d)); | |
4ec93edb | 66 | |
1da177e4 LT |
67 | spin_lock_bh(lock); |
68 | d->lock = lock; | |
69 | if (type) | |
1e90474c | 70 | d->tail = (struct nlattr *)skb_tail_pointer(skb); |
1da177e4 LT |
71 | d->skb = skb; |
72 | d->compat_tc_stats = tc_stats_type; | |
73 | d->compat_xstats = xstats_type; | |
74 | ||
75 | if (d->tail) | |
76 | return gnet_stats_copy(d, type, NULL, 0); | |
77 | ||
78 | return 0; | |
79 | } | |
9e34a5b5 | 80 | EXPORT_SYMBOL(gnet_stats_start_copy_compat); |
1da177e4 LT |
81 | |
82 | /** | |
83 | * gnet_stats_start_copy_compat - start dumping procedure in compatibility mode | |
84 | * @skb: socket buffer to put statistics TLVs into | |
85 | * @type: TLV type for top level statistic TLV | |
86 | * @lock: statistics lock | |
87 | * @d: dumping handle | |
88 | * | |
89 | * Initializes the dumping handle, grabs the statistic lock and appends | |
90 | * an empty TLV header to the socket buffer for use a container for all | |
91 | * other statistic TLVS. | |
92 | * | |
93 | * Returns 0 on success or -1 if the room in the socket buffer was not sufficient. | |
94 | */ | |
95 | int | |
96 | gnet_stats_start_copy(struct sk_buff *skb, int type, spinlock_t *lock, | |
97 | struct gnet_dump *d) | |
98 | { | |
99 | return gnet_stats_start_copy_compat(skb, type, 0, 0, lock, d); | |
100 | } | |
9e34a5b5 | 101 | EXPORT_SYMBOL(gnet_stats_start_copy); |
1da177e4 | 102 | |
22e0f8b9 JF |
103 | static void |
104 | __gnet_stats_copy_basic_cpu(struct gnet_stats_basic_packed *bstats, | |
105 | struct gnet_stats_basic_cpu __percpu *cpu) | |
106 | { | |
107 | int i; | |
108 | ||
109 | for_each_possible_cpu(i) { | |
110 | struct gnet_stats_basic_cpu *bcpu = per_cpu_ptr(cpu, i); | |
111 | unsigned int start; | |
02c0fc1b WC |
112 | u64 bytes; |
113 | u32 packets; | |
22e0f8b9 JF |
114 | |
115 | do { | |
116 | start = u64_stats_fetch_begin_irq(&bcpu->syncp); | |
117 | bytes = bcpu->bstats.bytes; | |
118 | packets = bcpu->bstats.packets; | |
119 | } while (u64_stats_fetch_retry_irq(&bcpu->syncp, start)); | |
120 | ||
02c0fc1b WC |
121 | bstats->bytes += bytes; |
122 | bstats->packets += packets; | |
22e0f8b9 JF |
123 | } |
124 | } | |
125 | ||
126 | void | |
127 | __gnet_stats_copy_basic(struct gnet_stats_basic_packed *bstats, | |
128 | struct gnet_stats_basic_cpu __percpu *cpu, | |
129 | struct gnet_stats_basic_packed *b) | |
130 | { | |
131 | if (cpu) { | |
132 | __gnet_stats_copy_basic_cpu(bstats, cpu); | |
133 | } else { | |
134 | bstats->bytes = b->bytes; | |
135 | bstats->packets = b->packets; | |
136 | } | |
137 | } | |
138 | EXPORT_SYMBOL(__gnet_stats_copy_basic); | |
139 | ||
1da177e4 LT |
140 | /** |
141 | * gnet_stats_copy_basic - copy basic statistics into statistic TLV | |
142 | * @d: dumping handle | |
b002fdcc | 143 | * @cpu: copy statistic per cpu |
1da177e4 LT |
144 | * @b: basic statistics |
145 | * | |
146 | * Appends the basic statistics to the top level TLV created by | |
147 | * gnet_stats_start_copy(). | |
148 | * | |
149 | * Returns 0 on success or -1 with the statistic lock released | |
150 | * if the room in the socket buffer was not sufficient. | |
151 | */ | |
152 | int | |
22e0f8b9 JF |
153 | gnet_stats_copy_basic(struct gnet_dump *d, |
154 | struct gnet_stats_basic_cpu __percpu *cpu, | |
155 | struct gnet_stats_basic_packed *b) | |
1da177e4 | 156 | { |
22e0f8b9 JF |
157 | struct gnet_stats_basic_packed bstats = {0}; |
158 | ||
159 | __gnet_stats_copy_basic(&bstats, cpu, b); | |
160 | ||
1da177e4 | 161 | if (d->compat_tc_stats) { |
22e0f8b9 JF |
162 | d->tc_stats.bytes = bstats.bytes; |
163 | d->tc_stats.packets = bstats.packets; | |
1da177e4 LT |
164 | } |
165 | ||
c1a8f1f1 ED |
166 | if (d->tail) { |
167 | struct gnet_stats_basic sb; | |
1da177e4 | 168 | |
c1a8f1f1 | 169 | memset(&sb, 0, sizeof(sb)); |
22e0f8b9 JF |
170 | sb.bytes = bstats.bytes; |
171 | sb.packets = bstats.packets; | |
c1a8f1f1 ED |
172 | return gnet_stats_copy(d, TCA_STATS_BASIC, &sb, sizeof(sb)); |
173 | } | |
1da177e4 LT |
174 | return 0; |
175 | } | |
9e34a5b5 | 176 | EXPORT_SYMBOL(gnet_stats_copy_basic); |
1da177e4 LT |
177 | |
178 | /** | |
179 | * gnet_stats_copy_rate_est - copy rate estimator statistics into statistics TLV | |
180 | * @d: dumping handle | |
d250a5f9 | 181 | * @b: basic statistics |
1da177e4 LT |
182 | * @r: rate estimator statistics |
183 | * | |
184 | * Appends the rate estimator statistics to the top level TLV created by | |
185 | * gnet_stats_start_copy(). | |
186 | * | |
187 | * Returns 0 on success or -1 with the statistic lock released | |
188 | * if the room in the socket buffer was not sufficient. | |
189 | */ | |
190 | int | |
d250a5f9 ED |
191 | gnet_stats_copy_rate_est(struct gnet_dump *d, |
192 | const struct gnet_stats_basic_packed *b, | |
45203a3b | 193 | struct gnet_stats_rate_est64 *r) |
1da177e4 | 194 | { |
45203a3b ED |
195 | struct gnet_stats_rate_est est; |
196 | int res; | |
197 | ||
d250a5f9 ED |
198 | if (b && !gen_estimator_active(b, r)) |
199 | return 0; | |
200 | ||
45203a3b ED |
201 | est.bps = min_t(u64, UINT_MAX, r->bps); |
202 | /* we have some time before reaching 2^32 packets per second */ | |
203 | est.pps = r->pps; | |
204 | ||
1da177e4 | 205 | if (d->compat_tc_stats) { |
45203a3b ED |
206 | d->tc_stats.bps = est.bps; |
207 | d->tc_stats.pps = est.pps; | |
1da177e4 LT |
208 | } |
209 | ||
45203a3b ED |
210 | if (d->tail) { |
211 | res = gnet_stats_copy(d, TCA_STATS_RATE_EST, &est, sizeof(est)); | |
212 | if (res < 0 || est.bps == r->bps) | |
213 | return res; | |
214 | /* emit 64bit stats only if needed */ | |
215 | return gnet_stats_copy(d, TCA_STATS_RATE_EST64, r, sizeof(*r)); | |
216 | } | |
1da177e4 LT |
217 | |
218 | return 0; | |
219 | } | |
9e34a5b5 | 220 | EXPORT_SYMBOL(gnet_stats_copy_rate_est); |
1da177e4 | 221 | |
b0ab6f92 JF |
222 | static void |
223 | __gnet_stats_copy_queue_cpu(struct gnet_stats_queue *qstats, | |
224 | const struct gnet_stats_queue __percpu *q) | |
225 | { | |
226 | int i; | |
227 | ||
228 | for_each_possible_cpu(i) { | |
229 | const struct gnet_stats_queue *qcpu = per_cpu_ptr(q, i); | |
230 | ||
231 | qstats->qlen = 0; | |
232 | qstats->backlog += qcpu->backlog; | |
233 | qstats->drops += qcpu->drops; | |
234 | qstats->requeues += qcpu->requeues; | |
235 | qstats->overlimits += qcpu->overlimits; | |
236 | } | |
237 | } | |
238 | ||
239 | static void __gnet_stats_copy_queue(struct gnet_stats_queue *qstats, | |
240 | const struct gnet_stats_queue __percpu *cpu, | |
241 | const struct gnet_stats_queue *q, | |
242 | __u32 qlen) | |
243 | { | |
244 | if (cpu) { | |
245 | __gnet_stats_copy_queue_cpu(qstats, cpu); | |
246 | } else { | |
247 | qstats->qlen = q->qlen; | |
248 | qstats->backlog = q->backlog; | |
249 | qstats->drops = q->drops; | |
250 | qstats->requeues = q->requeues; | |
251 | qstats->overlimits = q->overlimits; | |
252 | } | |
253 | ||
254 | qstats->qlen = qlen; | |
255 | } | |
256 | ||
1da177e4 LT |
257 | /** |
258 | * gnet_stats_copy_queue - copy queue statistics into statistics TLV | |
259 | * @d: dumping handle | |
b0ab6f92 | 260 | * @cpu_q: per cpu queue statistics |
1da177e4 | 261 | * @q: queue statistics |
64015853 | 262 | * @qlen: queue length statistics |
1da177e4 LT |
263 | * |
264 | * Appends the queue statistics to the top level TLV created by | |
b0ab6f92 JF |
265 | * gnet_stats_start_copy(). Using per cpu queue statistics if |
266 | * they are available. | |
1da177e4 LT |
267 | * |
268 | * Returns 0 on success or -1 with the statistic lock released | |
269 | * if the room in the socket buffer was not sufficient. | |
270 | */ | |
271 | int | |
64015853 | 272 | gnet_stats_copy_queue(struct gnet_dump *d, |
b0ab6f92 | 273 | struct gnet_stats_queue __percpu *cpu_q, |
64015853 | 274 | struct gnet_stats_queue *q, __u32 qlen) |
1da177e4 | 275 | { |
b0ab6f92 JF |
276 | struct gnet_stats_queue qstats = {0}; |
277 | ||
278 | __gnet_stats_copy_queue(&qstats, cpu_q, q, qlen); | |
64015853 | 279 | |
1da177e4 | 280 | if (d->compat_tc_stats) { |
b0ab6f92 JF |
281 | d->tc_stats.drops = qstats.drops; |
282 | d->tc_stats.qlen = qstats.qlen; | |
283 | d->tc_stats.backlog = qstats.backlog; | |
284 | d->tc_stats.overlimits = qstats.overlimits; | |
1da177e4 LT |
285 | } |
286 | ||
287 | if (d->tail) | |
b0ab6f92 JF |
288 | return gnet_stats_copy(d, TCA_STATS_QUEUE, |
289 | &qstats, sizeof(qstats)); | |
1da177e4 LT |
290 | |
291 | return 0; | |
292 | } | |
9e34a5b5 | 293 | EXPORT_SYMBOL(gnet_stats_copy_queue); |
1da177e4 LT |
294 | |
295 | /** | |
296 | * gnet_stats_copy_app - copy application specific statistics into statistics TLV | |
297 | * @d: dumping handle | |
298 | * @st: application specific statistics data | |
299 | * @len: length of data | |
300 | * | |
e793c0f7 | 301 | * Appends the application specific statistics to the top level TLV created by |
1da177e4 LT |
302 | * gnet_stats_start_copy() and remembers the data for XSTATS if the dumping |
303 | * handle is in backward compatibility mode. | |
304 | * | |
305 | * Returns 0 on success or -1 with the statistic lock released | |
306 | * if the room in the socket buffer was not sufficient. | |
307 | */ | |
308 | int | |
309 | gnet_stats_copy_app(struct gnet_dump *d, void *st, int len) | |
310 | { | |
311 | if (d->compat_xstats) { | |
1c4cff0c IG |
312 | d->xstats = kmemdup(st, len, GFP_ATOMIC); |
313 | if (!d->xstats) | |
314 | goto err_out; | |
1da177e4 LT |
315 | d->xstats_len = len; |
316 | } | |
317 | ||
318 | if (d->tail) | |
319 | return gnet_stats_copy(d, TCA_STATS_APP, st, len); | |
320 | ||
321 | return 0; | |
1c4cff0c IG |
322 | |
323 | err_out: | |
324 | d->xstats_len = 0; | |
325 | spin_unlock_bh(d->lock); | |
326 | return -1; | |
1da177e4 | 327 | } |
9e34a5b5 | 328 | EXPORT_SYMBOL(gnet_stats_copy_app); |
1da177e4 LT |
329 | |
330 | /** | |
331 | * gnet_stats_finish_copy - finish dumping procedure | |
332 | * @d: dumping handle | |
333 | * | |
334 | * Corrects the length of the top level TLV to include all TLVs added | |
335 | * by gnet_stats_copy_XXX() calls. Adds the backward compatibility TLVs | |
336 | * if gnet_stats_start_copy_compat() was used and releases the statistics | |
337 | * lock. | |
338 | * | |
339 | * Returns 0 on success or -1 with the statistic lock released | |
340 | * if the room in the socket buffer was not sufficient. | |
341 | */ | |
342 | int | |
343 | gnet_stats_finish_copy(struct gnet_dump *d) | |
344 | { | |
345 | if (d->tail) | |
1e90474c | 346 | d->tail->nla_len = skb_tail_pointer(d->skb) - (u8 *)d->tail; |
1da177e4 LT |
347 | |
348 | if (d->compat_tc_stats) | |
349 | if (gnet_stats_copy(d, d->compat_tc_stats, &d->tc_stats, | |
350 | sizeof(d->tc_stats)) < 0) | |
351 | return -1; | |
352 | ||
353 | if (d->compat_xstats && d->xstats) { | |
354 | if (gnet_stats_copy(d, d->compat_xstats, d->xstats, | |
355 | d->xstats_len) < 0) | |
356 | return -1; | |
357 | } | |
358 | ||
1c4cff0c IG |
359 | kfree(d->xstats); |
360 | d->xstats = NULL; | |
361 | d->xstats_len = 0; | |
1da177e4 LT |
362 | spin_unlock_bh(d->lock); |
363 | return 0; | |
364 | } | |
1da177e4 | 365 | EXPORT_SYMBOL(gnet_stats_finish_copy); |