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
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.
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.
58 * Returns 0 on success or -1 if the room in the socket buffer was not sufficient.
61 gnet_stats_start_copy_compat(struct sk_buff *skb, int type, int tc_stats_type,
62 int xstats_type, spinlock_t *lock,
63 struct gnet_dump *d, int padattr)
66 memset(d, 0, sizeof(*d));
71 d->tail = (struct nlattr *)skb_tail_pointer(skb);
73 d->compat_tc_stats = tc_stats_type;
74 d->compat_xstats = xstats_type;
78 return gnet_stats_copy(d, type, NULL, 0, padattr);
82 EXPORT_SYMBOL(gnet_stats_start_copy_compat);
85 * gnet_stats_start_copy - start dumping procedure in compatibility mode
86 * @skb: socket buffer to put statistics TLVs into
87 * @type: TLV type for top level statistic TLV
88 * @lock: statistics lock
91 * Initializes the dumping handle, grabs the statistic lock and appends
92 * an empty TLV header to the socket buffer for use a container for all
93 * other statistic TLVS.
95 * Returns 0 on success or -1 if the room in the socket buffer was not sufficient.
98 gnet_stats_start_copy(struct sk_buff *skb, int type, spinlock_t *lock,
99 struct gnet_dump *d, int padattr)
101 return gnet_stats_start_copy_compat(skb, type, 0, 0, lock, d, padattr);
103 EXPORT_SYMBOL(gnet_stats_start_copy);
106 __gnet_stats_copy_basic_cpu(struct gnet_stats_basic_packed *bstats,
107 struct gnet_stats_basic_cpu __percpu *cpu)
111 for_each_possible_cpu(i) {
112 struct gnet_stats_basic_cpu *bcpu = per_cpu_ptr(cpu, i);
118 start = u64_stats_fetch_begin_irq(&bcpu->syncp);
119 bytes = bcpu->bstats.bytes;
120 packets = bcpu->bstats.packets;
121 } while (u64_stats_fetch_retry_irq(&bcpu->syncp, start));
123 bstats->bytes += bytes;
124 bstats->packets += packets;
129 __gnet_stats_copy_basic(struct gnet_stats_basic_packed *bstats,
130 struct gnet_stats_basic_cpu __percpu *cpu,
131 struct gnet_stats_basic_packed *b)
134 __gnet_stats_copy_basic_cpu(bstats, cpu);
136 bstats->bytes = b->bytes;
137 bstats->packets = b->packets;
140 EXPORT_SYMBOL(__gnet_stats_copy_basic);
143 * gnet_stats_copy_basic - copy basic statistics into statistic TLV
145 * @cpu: copy statistic per cpu
146 * @b: basic statistics
148 * Appends the basic statistics to the top level TLV created by
149 * gnet_stats_start_copy().
151 * Returns 0 on success or -1 with the statistic lock released
152 * if the room in the socket buffer was not sufficient.
155 gnet_stats_copy_basic(struct gnet_dump *d,
156 struct gnet_stats_basic_cpu __percpu *cpu,
157 struct gnet_stats_basic_packed *b)
159 struct gnet_stats_basic_packed bstats = {0};
161 __gnet_stats_copy_basic(&bstats, cpu, b);
163 if (d->compat_tc_stats) {
164 d->tc_stats.bytes = bstats.bytes;
165 d->tc_stats.packets = bstats.packets;
169 struct gnet_stats_basic sb;
171 memset(&sb, 0, sizeof(sb));
172 sb.bytes = bstats.bytes;
173 sb.packets = bstats.packets;
174 return gnet_stats_copy(d, TCA_STATS_BASIC, &sb, sizeof(sb),
179 EXPORT_SYMBOL(gnet_stats_copy_basic);
182 * gnet_stats_copy_rate_est - copy rate estimator statistics into statistics TLV
184 * @b: basic statistics
185 * @r: rate estimator statistics
187 * Appends the rate estimator statistics to the top level TLV created by
188 * gnet_stats_start_copy().
190 * Returns 0 on success or -1 with the statistic lock released
191 * if the room in the socket buffer was not sufficient.
194 gnet_stats_copy_rate_est(struct gnet_dump *d,
195 const struct gnet_stats_basic_packed *b,
196 struct gnet_stats_rate_est64 *r)
198 struct gnet_stats_rate_est est;
201 if (b && !gen_estimator_active(b, r))
204 est.bps = min_t(u64, UINT_MAX, r->bps);
205 /* we have some time before reaching 2^32 packets per second */
208 if (d->compat_tc_stats) {
209 d->tc_stats.bps = est.bps;
210 d->tc_stats.pps = est.pps;
214 res = gnet_stats_copy(d, TCA_STATS_RATE_EST, &est, sizeof(est),
216 if (res < 0 || est.bps == r->bps)
218 /* emit 64bit stats only if needed */
219 return gnet_stats_copy(d, TCA_STATS_RATE_EST64, r, sizeof(*r),
225 EXPORT_SYMBOL(gnet_stats_copy_rate_est);
228 __gnet_stats_copy_queue_cpu(struct gnet_stats_queue *qstats,
229 const struct gnet_stats_queue __percpu *q)
233 for_each_possible_cpu(i) {
234 const struct gnet_stats_queue *qcpu = per_cpu_ptr(q, i);
237 qstats->backlog += qcpu->backlog;
238 qstats->drops += qcpu->drops;
239 qstats->requeues += qcpu->requeues;
240 qstats->overlimits += qcpu->overlimits;
244 static void __gnet_stats_copy_queue(struct gnet_stats_queue *qstats,
245 const struct gnet_stats_queue __percpu *cpu,
246 const struct gnet_stats_queue *q,
250 __gnet_stats_copy_queue_cpu(qstats, cpu);
252 qstats->qlen = q->qlen;
253 qstats->backlog = q->backlog;
254 qstats->drops = q->drops;
255 qstats->requeues = q->requeues;
256 qstats->overlimits = q->overlimits;
263 * gnet_stats_copy_queue - copy queue statistics into statistics TLV
265 * @cpu_q: per cpu queue statistics
266 * @q: queue statistics
267 * @qlen: queue length statistics
269 * Appends the queue statistics to the top level TLV created by
270 * gnet_stats_start_copy(). Using per cpu queue statistics if
271 * they are available.
273 * Returns 0 on success or -1 with the statistic lock released
274 * if the room in the socket buffer was not sufficient.
277 gnet_stats_copy_queue(struct gnet_dump *d,
278 struct gnet_stats_queue __percpu *cpu_q,
279 struct gnet_stats_queue *q, __u32 qlen)
281 struct gnet_stats_queue qstats = {0};
283 __gnet_stats_copy_queue(&qstats, cpu_q, q, qlen);
285 if (d->compat_tc_stats) {
286 d->tc_stats.drops = qstats.drops;
287 d->tc_stats.qlen = qstats.qlen;
288 d->tc_stats.backlog = qstats.backlog;
289 d->tc_stats.overlimits = qstats.overlimits;
293 return gnet_stats_copy(d, TCA_STATS_QUEUE,
294 &qstats, sizeof(qstats),
299 EXPORT_SYMBOL(gnet_stats_copy_queue);
302 * gnet_stats_copy_app - copy application specific statistics into statistics TLV
304 * @st: application specific statistics data
305 * @len: length of data
307 * Appends the application specific statistics to the top level TLV created by
308 * gnet_stats_start_copy() and remembers the data for XSTATS if the dumping
309 * handle is in backward compatibility mode.
311 * Returns 0 on success or -1 with the statistic lock released
312 * if the room in the socket buffer was not sufficient.
315 gnet_stats_copy_app(struct gnet_dump *d, void *st, int len)
317 if (d->compat_xstats) {
318 d->xstats = kmemdup(st, len, GFP_ATOMIC);
325 return gnet_stats_copy(d, TCA_STATS_APP, st, len,
332 spin_unlock_bh(d->lock);
335 EXPORT_SYMBOL(gnet_stats_copy_app);
338 * gnet_stats_finish_copy - finish dumping procedure
341 * Corrects the length of the top level TLV to include all TLVs added
342 * by gnet_stats_copy_XXX() calls. Adds the backward compatibility TLVs
343 * if gnet_stats_start_copy_compat() was used and releases the statistics
346 * Returns 0 on success or -1 with the statistic lock released
347 * if the room in the socket buffer was not sufficient.
350 gnet_stats_finish_copy(struct gnet_dump *d)
353 d->tail->nla_len = skb_tail_pointer(d->skb) - (u8 *)d->tail;
355 if (d->compat_tc_stats)
356 if (gnet_stats_copy(d, d->compat_tc_stats, &d->tc_stats,
357 sizeof(d->tc_stats), d->padattr) < 0)
360 if (d->compat_xstats && d->xstats) {
361 if (gnet_stats_copy(d, d->compat_xstats, d->xstats,
362 d->xstats_len, d->padattr) < 0)
369 spin_unlock_bh(d->lock);
372 EXPORT_SYMBOL(gnet_stats_finish_copy);