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
);