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 int ret
= gnet_stats_copy(d
, type
, NULL
, 0, padattr
);
83 /* The initial attribute added in gnet_stats_copy() may be
84 * preceded by a padding attribute, in which case d->tail will
85 * end up pointing at the padding instead of the real attribute.
86 * Fix this so gnet_stats_finish_copy() adjusts the length of
87 * the right attribute.
89 if (ret
== 0 && d
->tail
->nla_type
== padattr
)
90 d
->tail
= (struct nlattr
*)((char *)d
->tail
+
91 NLA_ALIGN(d
->tail
->nla_len
));
97 EXPORT_SYMBOL(gnet_stats_start_copy_compat
);
100 * gnet_stats_start_copy - start dumping procedure in compatibility mode
101 * @skb: socket buffer to put statistics TLVs into
102 * @type: TLV type for top level statistic TLV
103 * @lock: statistics lock
105 * @padattr: padding attribute
107 * Initializes the dumping handle, grabs the statistic lock and appends
108 * an empty TLV header to the socket buffer for use a container for all
109 * other statistic TLVS.
111 * Returns 0 on success or -1 if the room in the socket buffer was not sufficient.
114 gnet_stats_start_copy(struct sk_buff
*skb
, int type
, spinlock_t
*lock
,
115 struct gnet_dump
*d
, int padattr
)
117 return gnet_stats_start_copy_compat(skb
, type
, 0, 0, lock
, d
, padattr
);
119 EXPORT_SYMBOL(gnet_stats_start_copy
);
122 __gnet_stats_copy_basic_cpu(struct gnet_stats_basic_packed
*bstats
,
123 struct gnet_stats_basic_cpu __percpu
*cpu
)
127 for_each_possible_cpu(i
) {
128 struct gnet_stats_basic_cpu
*bcpu
= per_cpu_ptr(cpu
, i
);
134 start
= u64_stats_fetch_begin_irq(&bcpu
->syncp
);
135 bytes
= bcpu
->bstats
.bytes
;
136 packets
= bcpu
->bstats
.packets
;
137 } while (u64_stats_fetch_retry_irq(&bcpu
->syncp
, start
));
139 bstats
->bytes
+= bytes
;
140 bstats
->packets
+= packets
;
145 __gnet_stats_copy_basic(const seqcount_t
*running
,
146 struct gnet_stats_basic_packed
*bstats
,
147 struct gnet_stats_basic_cpu __percpu
*cpu
,
148 struct gnet_stats_basic_packed
*b
)
153 __gnet_stats_copy_basic_cpu(bstats
, cpu
);
158 seq
= read_seqcount_begin(running
);
159 bstats
->bytes
= b
->bytes
;
160 bstats
->packets
= b
->packets
;
161 } while (running
&& read_seqcount_retry(running
, seq
));
163 EXPORT_SYMBOL(__gnet_stats_copy_basic
);
166 * gnet_stats_copy_basic - copy basic statistics into statistic TLV
167 * @running: seqcount_t pointer
169 * @cpu: copy statistic per cpu
170 * @b: basic statistics
172 * Appends the basic statistics to the top level TLV created by
173 * gnet_stats_start_copy().
175 * Returns 0 on success or -1 with the statistic lock released
176 * if the room in the socket buffer was not sufficient.
179 gnet_stats_copy_basic(const seqcount_t
*running
,
181 struct gnet_stats_basic_cpu __percpu
*cpu
,
182 struct gnet_stats_basic_packed
*b
)
184 struct gnet_stats_basic_packed bstats
= {0};
186 __gnet_stats_copy_basic(running
, &bstats
, cpu
, b
);
188 if (d
->compat_tc_stats
) {
189 d
->tc_stats
.bytes
= bstats
.bytes
;
190 d
->tc_stats
.packets
= bstats
.packets
;
194 struct gnet_stats_basic sb
;
196 memset(&sb
, 0, sizeof(sb
));
197 sb
.bytes
= bstats
.bytes
;
198 sb
.packets
= bstats
.packets
;
199 return gnet_stats_copy(d
, TCA_STATS_BASIC
, &sb
, sizeof(sb
),
204 EXPORT_SYMBOL(gnet_stats_copy_basic
);
207 * gnet_stats_copy_rate_est - copy rate estimator statistics into statistics TLV
209 * @b: basic statistics
210 * @r: rate estimator statistics
212 * Appends the rate estimator statistics to the top level TLV created by
213 * gnet_stats_start_copy().
215 * Returns 0 on success or -1 with the statistic lock released
216 * if the room in the socket buffer was not sufficient.
219 gnet_stats_copy_rate_est(struct gnet_dump
*d
,
220 const struct gnet_stats_basic_packed
*b
,
221 struct gnet_stats_rate_est64
*r
)
223 struct gnet_stats_rate_est est
;
226 if (b
&& !gen_estimator_active(b
, r
))
229 est
.bps
= min_t(u64
, UINT_MAX
, r
->bps
);
230 /* we have some time before reaching 2^32 packets per second */
233 if (d
->compat_tc_stats
) {
234 d
->tc_stats
.bps
= est
.bps
;
235 d
->tc_stats
.pps
= est
.pps
;
239 res
= gnet_stats_copy(d
, TCA_STATS_RATE_EST
, &est
, sizeof(est
),
241 if (res
< 0 || est
.bps
== r
->bps
)
243 /* emit 64bit stats only if needed */
244 return gnet_stats_copy(d
, TCA_STATS_RATE_EST64
, r
, sizeof(*r
),
250 EXPORT_SYMBOL(gnet_stats_copy_rate_est
);
253 __gnet_stats_copy_queue_cpu(struct gnet_stats_queue
*qstats
,
254 const struct gnet_stats_queue __percpu
*q
)
258 for_each_possible_cpu(i
) {
259 const struct gnet_stats_queue
*qcpu
= per_cpu_ptr(q
, i
);
262 qstats
->backlog
+= qcpu
->backlog
;
263 qstats
->drops
+= qcpu
->drops
;
264 qstats
->requeues
+= qcpu
->requeues
;
265 qstats
->overlimits
+= qcpu
->overlimits
;
269 static void __gnet_stats_copy_queue(struct gnet_stats_queue
*qstats
,
270 const struct gnet_stats_queue __percpu
*cpu
,
271 const struct gnet_stats_queue
*q
,
275 __gnet_stats_copy_queue_cpu(qstats
, cpu
);
277 qstats
->qlen
= q
->qlen
;
278 qstats
->backlog
= q
->backlog
;
279 qstats
->drops
= q
->drops
;
280 qstats
->requeues
= q
->requeues
;
281 qstats
->overlimits
= q
->overlimits
;
288 * gnet_stats_copy_queue - copy queue statistics into statistics TLV
290 * @cpu_q: per cpu queue statistics
291 * @q: queue statistics
292 * @qlen: queue length statistics
294 * Appends the queue statistics to the top level TLV created by
295 * gnet_stats_start_copy(). Using per cpu queue statistics if
296 * they are available.
298 * Returns 0 on success or -1 with the statistic lock released
299 * if the room in the socket buffer was not sufficient.
302 gnet_stats_copy_queue(struct gnet_dump
*d
,
303 struct gnet_stats_queue __percpu
*cpu_q
,
304 struct gnet_stats_queue
*q
, __u32 qlen
)
306 struct gnet_stats_queue qstats
= {0};
308 __gnet_stats_copy_queue(&qstats
, cpu_q
, q
, qlen
);
310 if (d
->compat_tc_stats
) {
311 d
->tc_stats
.drops
= qstats
.drops
;
312 d
->tc_stats
.qlen
= qstats
.qlen
;
313 d
->tc_stats
.backlog
= qstats
.backlog
;
314 d
->tc_stats
.overlimits
= qstats
.overlimits
;
318 return gnet_stats_copy(d
, TCA_STATS_QUEUE
,
319 &qstats
, sizeof(qstats
),
324 EXPORT_SYMBOL(gnet_stats_copy_queue
);
327 * gnet_stats_copy_app - copy application specific statistics into statistics TLV
329 * @st: application specific statistics data
330 * @len: length of data
332 * Appends the application specific statistics to the top level TLV created by
333 * gnet_stats_start_copy() and remembers the data for XSTATS if the dumping
334 * handle is in backward compatibility mode.
336 * Returns 0 on success or -1 with the statistic lock released
337 * if the room in the socket buffer was not sufficient.
340 gnet_stats_copy_app(struct gnet_dump
*d
, void *st
, int len
)
342 if (d
->compat_xstats
) {
343 d
->xstats
= kmemdup(st
, len
, GFP_ATOMIC
);
350 return gnet_stats_copy(d
, TCA_STATS_APP
, st
, len
,
357 spin_unlock_bh(d
->lock
);
361 EXPORT_SYMBOL(gnet_stats_copy_app
);
364 * gnet_stats_finish_copy - finish dumping procedure
367 * Corrects the length of the top level TLV to include all TLVs added
368 * by gnet_stats_copy_XXX() calls. Adds the backward compatibility TLVs
369 * if gnet_stats_start_copy_compat() was used and releases the statistics
372 * Returns 0 on success or -1 with the statistic lock released
373 * if the room in the socket buffer was not sufficient.
376 gnet_stats_finish_copy(struct gnet_dump
*d
)
379 d
->tail
->nla_len
= skb_tail_pointer(d
->skb
) - (u8
*)d
->tail
;
381 if (d
->compat_tc_stats
)
382 if (gnet_stats_copy(d
, d
->compat_tc_stats
, &d
->tc_stats
,
383 sizeof(d
->tc_stats
), d
->padattr
) < 0)
386 if (d
->compat_xstats
&& d
->xstats
) {
387 if (gnet_stats_copy(d
, d
->compat_xstats
, d
->xstats
,
388 d
->xstats_len
, d
->padattr
) < 0)
393 spin_unlock_bh(d
->lock
);
399 EXPORT_SYMBOL(gnet_stats_finish_copy
);