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
))
36 spin_unlock_bh(d
->lock
);
44 * gnet_stats_start_copy_compat - start dumping procedure in compatibility mode
45 * @skb: socket buffer to put statistics TLVs into
46 * @type: TLV type for top level statistic TLV
47 * @tc_stats_type: TLV type for backward compatibility struct tc_stats TLV
48 * @xstats_type: TLV type for backward compatibility xstats TLV
49 * @lock: statistics lock
51 * @padattr: padding attribute
53 * Initializes the dumping handle, grabs the statistic lock and appends
54 * an empty TLV header to the socket buffer for use a container for all
55 * other statistic TLVS.
57 * The dumping handle is marked to be in backward compatibility mode telling
58 * all gnet_stats_copy_XXX() functions to fill a local copy of struct tc_stats.
60 * Returns 0 on success or -1 if the room in the socket buffer was not sufficient.
63 gnet_stats_start_copy_compat(struct sk_buff
*skb
, int type
, int tc_stats_type
,
64 int xstats_type
, spinlock_t
*lock
,
65 struct gnet_dump
*d
, int padattr
)
68 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
;
81 return gnet_stats_copy(d
, type
, NULL
, 0, padattr
);
85 EXPORT_SYMBOL(gnet_stats_start_copy_compat
);
88 * gnet_stats_start_copy - start dumping procedure in compatibility mode
89 * @skb: socket buffer to put statistics TLVs into
90 * @type: TLV type for top level statistic TLV
91 * @lock: statistics lock
93 * @padattr: padding attribute
95 * Initializes the dumping handle, grabs the statistic lock and appends
96 * an empty TLV header to the socket buffer for use a container for all
97 * other statistic TLVS.
99 * Returns 0 on success or -1 if the room in the socket buffer was not sufficient.
102 gnet_stats_start_copy(struct sk_buff
*skb
, int type
, spinlock_t
*lock
,
103 struct gnet_dump
*d
, int padattr
)
105 return gnet_stats_start_copy_compat(skb
, type
, 0, 0, lock
, d
, padattr
);
107 EXPORT_SYMBOL(gnet_stats_start_copy
);
110 __gnet_stats_copy_basic_cpu(struct gnet_stats_basic_packed
*bstats
,
111 struct gnet_stats_basic_cpu __percpu
*cpu
)
115 for_each_possible_cpu(i
) {
116 struct gnet_stats_basic_cpu
*bcpu
= per_cpu_ptr(cpu
, i
);
122 start
= u64_stats_fetch_begin_irq(&bcpu
->syncp
);
123 bytes
= bcpu
->bstats
.bytes
;
124 packets
= bcpu
->bstats
.packets
;
125 } while (u64_stats_fetch_retry_irq(&bcpu
->syncp
, start
));
127 bstats
->bytes
+= bytes
;
128 bstats
->packets
+= packets
;
133 __gnet_stats_copy_basic(const seqcount_t
*running
,
134 struct gnet_stats_basic_packed
*bstats
,
135 struct gnet_stats_basic_cpu __percpu
*cpu
,
136 struct gnet_stats_basic_packed
*b
)
141 __gnet_stats_copy_basic_cpu(bstats
, cpu
);
146 seq
= read_seqcount_begin(running
);
147 bstats
->bytes
= b
->bytes
;
148 bstats
->packets
= b
->packets
;
149 } while (running
&& read_seqcount_retry(running
, seq
));
151 EXPORT_SYMBOL(__gnet_stats_copy_basic
);
154 * gnet_stats_copy_basic - copy basic statistics into statistic TLV
155 * @running: seqcount_t pointer
157 * @cpu: copy statistic per cpu
158 * @b: basic statistics
160 * Appends the basic statistics to the top level TLV created by
161 * gnet_stats_start_copy().
163 * Returns 0 on success or -1 with the statistic lock released
164 * if the room in the socket buffer was not sufficient.
167 gnet_stats_copy_basic(const seqcount_t
*running
,
169 struct gnet_stats_basic_cpu __percpu
*cpu
,
170 struct gnet_stats_basic_packed
*b
)
172 struct gnet_stats_basic_packed bstats
= {0};
174 __gnet_stats_copy_basic(running
, &bstats
, cpu
, b
);
176 if (d
->compat_tc_stats
) {
177 d
->tc_stats
.bytes
= bstats
.bytes
;
178 d
->tc_stats
.packets
= bstats
.packets
;
182 struct gnet_stats_basic sb
;
184 memset(&sb
, 0, sizeof(sb
));
185 sb
.bytes
= bstats
.bytes
;
186 sb
.packets
= bstats
.packets
;
187 return gnet_stats_copy(d
, TCA_STATS_BASIC
, &sb
, sizeof(sb
),
192 EXPORT_SYMBOL(gnet_stats_copy_basic
);
195 * gnet_stats_copy_rate_est - copy rate estimator statistics into statistics TLV
197 * @b: basic statistics
198 * @r: rate estimator statistics
200 * Appends the rate estimator statistics to the top level TLV created by
201 * gnet_stats_start_copy().
203 * Returns 0 on success or -1 with the statistic lock released
204 * if the room in the socket buffer was not sufficient.
207 gnet_stats_copy_rate_est(struct gnet_dump
*d
,
208 const struct gnet_stats_basic_packed
*b
,
209 struct gnet_stats_rate_est64
*r
)
211 struct gnet_stats_rate_est est
;
214 if (b
&& !gen_estimator_active(b
, r
))
217 est
.bps
= min_t(u64
, UINT_MAX
, r
->bps
);
218 /* we have some time before reaching 2^32 packets per second */
221 if (d
->compat_tc_stats
) {
222 d
->tc_stats
.bps
= est
.bps
;
223 d
->tc_stats
.pps
= est
.pps
;
227 res
= gnet_stats_copy(d
, TCA_STATS_RATE_EST
, &est
, sizeof(est
),
229 if (res
< 0 || est
.bps
== r
->bps
)
231 /* emit 64bit stats only if needed */
232 return gnet_stats_copy(d
, TCA_STATS_RATE_EST64
, r
, sizeof(*r
),
238 EXPORT_SYMBOL(gnet_stats_copy_rate_est
);
241 __gnet_stats_copy_queue_cpu(struct gnet_stats_queue
*qstats
,
242 const struct gnet_stats_queue __percpu
*q
)
246 for_each_possible_cpu(i
) {
247 const struct gnet_stats_queue
*qcpu
= per_cpu_ptr(q
, i
);
250 qstats
->backlog
+= qcpu
->backlog
;
251 qstats
->drops
+= qcpu
->drops
;
252 qstats
->requeues
+= qcpu
->requeues
;
253 qstats
->overlimits
+= qcpu
->overlimits
;
257 static void __gnet_stats_copy_queue(struct gnet_stats_queue
*qstats
,
258 const struct gnet_stats_queue __percpu
*cpu
,
259 const struct gnet_stats_queue
*q
,
263 __gnet_stats_copy_queue_cpu(qstats
, cpu
);
265 qstats
->qlen
= q
->qlen
;
266 qstats
->backlog
= q
->backlog
;
267 qstats
->drops
= q
->drops
;
268 qstats
->requeues
= q
->requeues
;
269 qstats
->overlimits
= q
->overlimits
;
276 * gnet_stats_copy_queue - copy queue statistics into statistics TLV
278 * @cpu_q: per cpu queue statistics
279 * @q: queue statistics
280 * @qlen: queue length statistics
282 * Appends the queue statistics to the top level TLV created by
283 * gnet_stats_start_copy(). Using per cpu queue statistics if
284 * they are available.
286 * Returns 0 on success or -1 with the statistic lock released
287 * if the room in the socket buffer was not sufficient.
290 gnet_stats_copy_queue(struct gnet_dump
*d
,
291 struct gnet_stats_queue __percpu
*cpu_q
,
292 struct gnet_stats_queue
*q
, __u32 qlen
)
294 struct gnet_stats_queue qstats
= {0};
296 __gnet_stats_copy_queue(&qstats
, cpu_q
, q
, qlen
);
298 if (d
->compat_tc_stats
) {
299 d
->tc_stats
.drops
= qstats
.drops
;
300 d
->tc_stats
.qlen
= qstats
.qlen
;
301 d
->tc_stats
.backlog
= qstats
.backlog
;
302 d
->tc_stats
.overlimits
= qstats
.overlimits
;
306 return gnet_stats_copy(d
, TCA_STATS_QUEUE
,
307 &qstats
, sizeof(qstats
),
312 EXPORT_SYMBOL(gnet_stats_copy_queue
);
315 * gnet_stats_copy_app - copy application specific statistics into statistics TLV
317 * @st: application specific statistics data
318 * @len: length of data
320 * Appends the application specific statistics to the top level TLV created by
321 * gnet_stats_start_copy() and remembers the data for XSTATS if the dumping
322 * handle is in backward compatibility mode.
324 * Returns 0 on success or -1 with the statistic lock released
325 * if the room in the socket buffer was not sufficient.
328 gnet_stats_copy_app(struct gnet_dump
*d
, void *st
, int len
)
330 if (d
->compat_xstats
) {
331 d
->xstats
= kmemdup(st
, len
, GFP_ATOMIC
);
338 return gnet_stats_copy(d
, TCA_STATS_APP
, st
, len
,
345 spin_unlock_bh(d
->lock
);
349 EXPORT_SYMBOL(gnet_stats_copy_app
);
352 * gnet_stats_finish_copy - finish dumping procedure
355 * Corrects the length of the top level TLV to include all TLVs added
356 * by gnet_stats_copy_XXX() calls. Adds the backward compatibility TLVs
357 * if gnet_stats_start_copy_compat() was used and releases the statistics
360 * Returns 0 on success or -1 with the statistic lock released
361 * if the room in the socket buffer was not sufficient.
364 gnet_stats_finish_copy(struct gnet_dump
*d
)
367 d
->tail
->nla_len
= skb_tail_pointer(d
->skb
) - (u8
*)d
->tail
;
369 if (d
->compat_tc_stats
)
370 if (gnet_stats_copy(d
, d
->compat_tc_stats
, &d
->tc_stats
,
371 sizeof(d
->tc_stats
), d
->padattr
) < 0)
374 if (d
->compat_xstats
&& d
->xstats
) {
375 if (gnet_stats_copy(d
, d
->compat_xstats
, d
->xstats
,
376 d
->xstats_len
, d
->padattr
) < 0)
381 spin_unlock_bh(d
->lock
);
387 EXPORT_SYMBOL(gnet_stats_finish_copy
);