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.
9 * Authors: Thomas Graf <tgraf@suug.ch>
11 * Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
13 * See Documentation/networking/gen_stats.txt
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>
23 #include <net/netlink.h>
24 #include <net/gen_stats.h>
28 gnet_stats_copy(struct gnet_dump *d, int type, void *buf, int size, int padattr)
30 if (nla_put_64bit(d->skb, type, size, buf, padattr))
38 spin_unlock_bh(d->lock);
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
50 * @padattr: padding attribute
52 * Initializes the dumping handle, grabs the statistic lock and appends
53 * an empty TLV header to the socket buffer for use a container for all
54 * other statistic TLVS.
56 * The dumping handle is marked to be in backward compatibility mode telling
57 * all gnet_stats_copy_XXX() functions to fill a local copy of struct tc_stats.
59 * Returns 0 on success or -1 if the room in the socket buffer was not sufficient.
62 gnet_stats_start_copy_compat(struct sk_buff *skb, int type, int tc_stats_type,
63 int xstats_type, spinlock_t *lock,
64 struct gnet_dump *d, int padattr)
67 memset(d, 0, sizeof(*d));
72 d->tail = (struct nlattr *)skb_tail_pointer(skb);
74 d->compat_tc_stats = tc_stats_type;
75 d->compat_xstats = xstats_type;
79 return gnet_stats_copy(d, type, NULL, 0, padattr);
83 EXPORT_SYMBOL(gnet_stats_start_copy_compat);
86 * gnet_stats_start_copy - start dumping procedure in compatibility mode
87 * @skb: socket buffer to put statistics TLVs into
88 * @type: TLV type for top level statistic TLV
89 * @lock: statistics lock
91 * @padattr: padding attribute
93 * Initializes the dumping handle, grabs the statistic lock and appends
94 * an empty TLV header to the socket buffer for use a container for all
95 * other statistic TLVS.
97 * Returns 0 on success or -1 if the room in the socket buffer was not sufficient.
100 gnet_stats_start_copy(struct sk_buff *skb, int type, spinlock_t *lock,
101 struct gnet_dump *d, int padattr)
103 return gnet_stats_start_copy_compat(skb, type, 0, 0, lock, d, padattr);
105 EXPORT_SYMBOL(gnet_stats_start_copy);
108 __gnet_stats_copy_basic_cpu(struct gnet_stats_basic_packed *bstats,
109 struct gnet_stats_basic_cpu __percpu *cpu)
113 for_each_possible_cpu(i) {
114 struct gnet_stats_basic_cpu *bcpu = per_cpu_ptr(cpu, i);
120 start = u64_stats_fetch_begin_irq(&bcpu->syncp);
121 bytes = bcpu->bstats.bytes;
122 packets = bcpu->bstats.packets;
123 } while (u64_stats_fetch_retry_irq(&bcpu->syncp, start));
125 bstats->bytes += bytes;
126 bstats->packets += packets;
131 __gnet_stats_copy_basic(struct gnet_stats_basic_packed *bstats,
132 struct gnet_stats_basic_cpu __percpu *cpu,
133 struct gnet_stats_basic_packed *b)
136 __gnet_stats_copy_basic_cpu(bstats, cpu);
138 bstats->bytes = b->bytes;
139 bstats->packets = b->packets;
142 EXPORT_SYMBOL(__gnet_stats_copy_basic);
145 * gnet_stats_copy_basic - copy basic statistics into statistic TLV
147 * @cpu: copy statistic per cpu
148 * @b: basic statistics
150 * Appends the basic statistics to the top level TLV created by
151 * gnet_stats_start_copy().
153 * Returns 0 on success or -1 with the statistic lock released
154 * if the room in the socket buffer was not sufficient.
157 gnet_stats_copy_basic(struct gnet_dump *d,
158 struct gnet_stats_basic_cpu __percpu *cpu,
159 struct gnet_stats_basic_packed *b)
161 struct gnet_stats_basic_packed bstats = {0};
163 __gnet_stats_copy_basic(&bstats, cpu, b);
165 if (d->compat_tc_stats) {
166 d->tc_stats.bytes = bstats.bytes;
167 d->tc_stats.packets = bstats.packets;
171 struct gnet_stats_basic sb;
173 memset(&sb, 0, sizeof(sb));
174 sb.bytes = bstats.bytes;
175 sb.packets = bstats.packets;
176 return gnet_stats_copy(d, TCA_STATS_BASIC, &sb, sizeof(sb),
181 EXPORT_SYMBOL(gnet_stats_copy_basic);
184 * gnet_stats_copy_rate_est - copy rate estimator statistics into statistics TLV
186 * @b: basic statistics
187 * @r: rate estimator statistics
189 * Appends the rate estimator statistics to the top level TLV created by
190 * gnet_stats_start_copy().
192 * Returns 0 on success or -1 with the statistic lock released
193 * if the room in the socket buffer was not sufficient.
196 gnet_stats_copy_rate_est(struct gnet_dump *d,
197 const struct gnet_stats_basic_packed *b,
198 struct gnet_stats_rate_est64 *r)
200 struct gnet_stats_rate_est est;
203 if (b && !gen_estimator_active(b, r))
206 est.bps = min_t(u64, UINT_MAX, r->bps);
207 /* we have some time before reaching 2^32 packets per second */
210 if (d->compat_tc_stats) {
211 d->tc_stats.bps = est.bps;
212 d->tc_stats.pps = est.pps;
216 res = gnet_stats_copy(d, TCA_STATS_RATE_EST, &est, sizeof(est),
218 if (res < 0 || est.bps == r->bps)
220 /* emit 64bit stats only if needed */
221 return gnet_stats_copy(d, TCA_STATS_RATE_EST64, r, sizeof(*r),
227 EXPORT_SYMBOL(gnet_stats_copy_rate_est);
230 __gnet_stats_copy_queue_cpu(struct gnet_stats_queue *qstats,
231 const struct gnet_stats_queue __percpu *q)
235 for_each_possible_cpu(i) {
236 const struct gnet_stats_queue *qcpu = per_cpu_ptr(q, i);
239 qstats->backlog += qcpu->backlog;
240 qstats->drops += qcpu->drops;
241 qstats->requeues += qcpu->requeues;
242 qstats->overlimits += qcpu->overlimits;
246 static void __gnet_stats_copy_queue(struct gnet_stats_queue *qstats,
247 const struct gnet_stats_queue __percpu *cpu,
248 const struct gnet_stats_queue *q,
252 __gnet_stats_copy_queue_cpu(qstats, cpu);
254 qstats->qlen = q->qlen;
255 qstats->backlog = q->backlog;
256 qstats->drops = q->drops;
257 qstats->requeues = q->requeues;
258 qstats->overlimits = q->overlimits;
265 * gnet_stats_copy_queue - copy queue statistics into statistics TLV
267 * @cpu_q: per cpu queue statistics
268 * @q: queue statistics
269 * @qlen: queue length statistics
271 * Appends the queue statistics to the top level TLV created by
272 * gnet_stats_start_copy(). Using per cpu queue statistics if
273 * they are available.
275 * Returns 0 on success or -1 with the statistic lock released
276 * if the room in the socket buffer was not sufficient.
279 gnet_stats_copy_queue(struct gnet_dump *d,
280 struct gnet_stats_queue __percpu *cpu_q,
281 struct gnet_stats_queue *q, __u32 qlen)
283 struct gnet_stats_queue qstats = {0};
285 __gnet_stats_copy_queue(&qstats, cpu_q, q, qlen);
287 if (d->compat_tc_stats) {
288 d->tc_stats.drops = qstats.drops;
289 d->tc_stats.qlen = qstats.qlen;
290 d->tc_stats.backlog = qstats.backlog;
291 d->tc_stats.overlimits = qstats.overlimits;
295 return gnet_stats_copy(d, TCA_STATS_QUEUE,
296 &qstats, sizeof(qstats),
301 EXPORT_SYMBOL(gnet_stats_copy_queue);
304 * gnet_stats_copy_app - copy application specific statistics into statistics TLV
306 * @st: application specific statistics data
307 * @len: length of data
309 * Appends the application specific statistics to the top level TLV created by
310 * gnet_stats_start_copy() and remembers the data for XSTATS if the dumping
311 * handle is in backward compatibility mode.
313 * Returns 0 on success or -1 with the statistic lock released
314 * if the room in the socket buffer was not sufficient.
317 gnet_stats_copy_app(struct gnet_dump *d, void *st, int len)
319 if (d->compat_xstats) {
320 d->xstats = kmemdup(st, len, GFP_ATOMIC);
327 return gnet_stats_copy(d, TCA_STATS_APP, st, len,
334 spin_unlock_bh(d->lock);
337 EXPORT_SYMBOL(gnet_stats_copy_app);
340 * gnet_stats_finish_copy - finish dumping procedure
343 * Corrects the length of the top level TLV to include all TLVs added
344 * by gnet_stats_copy_XXX() calls. Adds the backward compatibility TLVs
345 * if gnet_stats_start_copy_compat() was used and releases the statistics
348 * Returns 0 on success or -1 with the statistic lock released
349 * if the room in the socket buffer was not sufficient.
352 gnet_stats_finish_copy(struct gnet_dump *d)
355 d->tail->nla_len = skb_tail_pointer(d->skb) - (u8 *)d->tail;
357 if (d->compat_tc_stats)
358 if (gnet_stats_copy(d, d->compat_tc_stats, &d->tc_stats,
359 sizeof(d->tc_stats), d->padattr) < 0)
362 if (d->compat_xstats && d->xstats) {
363 if (gnet_stats_copy(d, d->compat_xstats, d->xstats,
364 d->xstats_len, d->padattr) < 0)
371 spin_unlock_bh(d->lock);
374 EXPORT_SYMBOL(gnet_stats_finish_copy);