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Linux/net/core/gen_stats.c

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  1 // SPDX-License-Identifier: GPL-2.0-or-later
  2 /*
  3  * net/core/gen_stats.c
  4  *
  5  * Authors:  Thomas Graf <tgraf@suug.ch>
  6  *           Jamal Hadi Salim
  7  *           Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
  8  *
  9  * See Documentation/networking/gen_stats.txt
 10  */
 11 
 12 #include <linux/types.h>
 13 #include <linux/kernel.h>
 14 #include <linux/module.h>
 15 #include <linux/interrupt.h>
 16 #include <linux/socket.h>
 17 #include <linux/rtnetlink.h>
 18 #include <linux/gen_stats.h>
 19 #include <net/netlink.h>
 20 #include <net/gen_stats.h>
 21 
 22 
 23 static inline int
 24 gnet_stats_copy(struct gnet_dump *d, int type, void *buf, int size, int padattr)
 25 {
 26         if (nla_put_64bit(d->skb, type, size, buf, padattr))
 27                 goto nla_put_failure;
 28         return 0;
 29 
 30 nla_put_failure:
 31         if (d->lock)
 32                 spin_unlock_bh(d->lock);
 33         kfree(d->xstats);
 34         d->xstats = NULL;
 35         d->xstats_len = 0;
 36         return -1;
 37 }
 38 
 39 /**
 40  * gnet_stats_start_copy_compat - start dumping procedure in compatibility mode
 41  * @skb: socket buffer to put statistics TLVs into
 42  * @type: TLV type for top level statistic TLV
 43  * @tc_stats_type: TLV type for backward compatibility struct tc_stats TLV
 44  * @xstats_type: TLV type for backward compatibility xstats TLV
 45  * @lock: statistics lock
 46  * @d: dumping handle
 47  * @padattr: padding attribute
 48  *
 49  * Initializes the dumping handle, grabs the statistic lock and appends
 50  * an empty TLV header to the socket buffer for use a container for all
 51  * other statistic TLVS.
 52  *
 53  * The dumping handle is marked to be in backward compatibility mode telling
 54  * all gnet_stats_copy_XXX() functions to fill a local copy of struct tc_stats.
 55  *
 56  * Returns 0 on success or -1 if the room in the socket buffer was not sufficient.
 57  */
 58 int
 59 gnet_stats_start_copy_compat(struct sk_buff *skb, int type, int tc_stats_type,
 60                              int xstats_type, spinlock_t *lock,
 61                              struct gnet_dump *d, int padattr)
 62         __acquires(lock)
 63 {
 64         memset(d, 0, sizeof(*d));
 65 
 66         if (type)
 67                 d->tail = (struct nlattr *)skb_tail_pointer(skb);
 68         d->skb = skb;
 69         d->compat_tc_stats = tc_stats_type;
 70         d->compat_xstats = xstats_type;
 71         d->padattr = padattr;
 72         if (lock) {
 73                 d->lock = lock;
 74                 spin_lock_bh(lock);
 75         }
 76         if (d->tail) {
 77                 int ret = gnet_stats_copy(d, type, NULL, 0, padattr);
 78 
 79                 /* The initial attribute added in gnet_stats_copy() may be
 80                  * preceded by a padding attribute, in which case d->tail will
 81                  * end up pointing at the padding instead of the real attribute.
 82                  * Fix this so gnet_stats_finish_copy() adjusts the length of
 83                  * the right attribute.
 84                  */
 85                 if (ret == 0 && d->tail->nla_type == padattr)
 86                         d->tail = (struct nlattr *)((char *)d->tail +
 87                                                     NLA_ALIGN(d->tail->nla_len));
 88                 return ret;
 89         }
 90 
 91         return 0;
 92 }
 93 EXPORT_SYMBOL(gnet_stats_start_copy_compat);
 94 
 95 /**
 96  * gnet_stats_start_copy - start dumping procedure in compatibility mode
 97  * @skb: socket buffer to put statistics TLVs into
 98  * @type: TLV type for top level statistic TLV
 99  * @lock: statistics lock
100  * @d: dumping handle
101  * @padattr: padding attribute
102  *
103  * Initializes the dumping handle, grabs the statistic lock and appends
104  * an empty TLV header to the socket buffer for use a container for all
105  * other statistic TLVS.
106  *
107  * Returns 0 on success or -1 if the room in the socket buffer was not sufficient.
108  */
109 int
110 gnet_stats_start_copy(struct sk_buff *skb, int type, spinlock_t *lock,
111                       struct gnet_dump *d, int padattr)
112 {
113         return gnet_stats_start_copy_compat(skb, type, 0, 0, lock, d, padattr);
114 }
115 EXPORT_SYMBOL(gnet_stats_start_copy);
116 
117 static void
118 __gnet_stats_copy_basic_cpu(struct gnet_stats_basic_packed *bstats,
119                             struct gnet_stats_basic_cpu __percpu *cpu)
120 {
121         int i;
122 
123         for_each_possible_cpu(i) {
124                 struct gnet_stats_basic_cpu *bcpu = per_cpu_ptr(cpu, i);
125                 unsigned int start;
126                 u64 bytes;
127                 u32 packets;
128 
129                 do {
130                         start = u64_stats_fetch_begin_irq(&bcpu->syncp);
131                         bytes = bcpu->bstats.bytes;
132                         packets = bcpu->bstats.packets;
133                 } while (u64_stats_fetch_retry_irq(&bcpu->syncp, start));
134 
135                 bstats->bytes += bytes;
136                 bstats->packets += packets;
137         }
138 }
139 
140 void
141 __gnet_stats_copy_basic(const seqcount_t *running,
142                         struct gnet_stats_basic_packed *bstats,
143                         struct gnet_stats_basic_cpu __percpu *cpu,
144                         struct gnet_stats_basic_packed *b)
145 {
146         unsigned int seq;
147 
148         if (cpu) {
149                 __gnet_stats_copy_basic_cpu(bstats, cpu);
150                 return;
151         }
152         do {
153                 if (running)
154                         seq = read_seqcount_begin(running);
155                 bstats->bytes = b->bytes;
156                 bstats->packets = b->packets;
157         } while (running && read_seqcount_retry(running, seq));
158 }
159 EXPORT_SYMBOL(__gnet_stats_copy_basic);
160 
161 static int
162 ___gnet_stats_copy_basic(const seqcount_t *running,
163                          struct gnet_dump *d,
164                          struct gnet_stats_basic_cpu __percpu *cpu,
165                          struct gnet_stats_basic_packed *b,
166                          int type)
167 {
168         struct gnet_stats_basic_packed bstats = {0};
169 
170         __gnet_stats_copy_basic(running, &bstats, cpu, b);
171 
172         if (d->compat_tc_stats && type == TCA_STATS_BASIC) {
173                 d->tc_stats.bytes = bstats.bytes;
174                 d->tc_stats.packets = bstats.packets;
175         }
176 
177         if (d->tail) {
178                 struct gnet_stats_basic sb;
179 
180                 memset(&sb, 0, sizeof(sb));
181                 sb.bytes = bstats.bytes;
182                 sb.packets = bstats.packets;
183                 return gnet_stats_copy(d, type, &sb, sizeof(sb),
184                                        TCA_STATS_PAD);
185         }
186         return 0;
187 }
188 
189 /**
190  * gnet_stats_copy_basic - copy basic statistics into statistic TLV
191  * @running: seqcount_t pointer
192  * @d: dumping handle
193  * @cpu: copy statistic per cpu
194  * @b: basic statistics
195  *
196  * Appends the basic statistics to the top level TLV created by
197  * gnet_stats_start_copy().
198  *
199  * Returns 0 on success or -1 with the statistic lock released
200  * if the room in the socket buffer was not sufficient.
201  */
202 int
203 gnet_stats_copy_basic(const seqcount_t *running,
204                       struct gnet_dump *d,
205                       struct gnet_stats_basic_cpu __percpu *cpu,
206                       struct gnet_stats_basic_packed *b)
207 {
208         return ___gnet_stats_copy_basic(running, d, cpu, b,
209                                         TCA_STATS_BASIC);
210 }
211 EXPORT_SYMBOL(gnet_stats_copy_basic);
212 
213 /**
214  * gnet_stats_copy_basic_hw - copy basic hw statistics into statistic TLV
215  * @running: seqcount_t pointer
216  * @d: dumping handle
217  * @cpu: copy statistic per cpu
218  * @b: basic statistics
219  *
220  * Appends the basic statistics to the top level TLV created by
221  * gnet_stats_start_copy().
222  *
223  * Returns 0 on success or -1 with the statistic lock released
224  * if the room in the socket buffer was not sufficient.
225  */
226 int
227 gnet_stats_copy_basic_hw(const seqcount_t *running,
228                          struct gnet_dump *d,
229                          struct gnet_stats_basic_cpu __percpu *cpu,
230                          struct gnet_stats_basic_packed *b)
231 {
232         return ___gnet_stats_copy_basic(running, d, cpu, b,
233                                         TCA_STATS_BASIC_HW);
234 }
235 EXPORT_SYMBOL(gnet_stats_copy_basic_hw);
236 
237 /**
238  * gnet_stats_copy_rate_est - copy rate estimator statistics into statistics TLV
239  * @d: dumping handle
240  * @rate_est: rate estimator
241  *
242  * Appends the rate estimator statistics to the top level TLV created by
243  * gnet_stats_start_copy().
244  *
245  * Returns 0 on success or -1 with the statistic lock released
246  * if the room in the socket buffer was not sufficient.
247  */
248 int
249 gnet_stats_copy_rate_est(struct gnet_dump *d,
250                          struct net_rate_estimator __rcu **rate_est)
251 {
252         struct gnet_stats_rate_est64 sample;
253         struct gnet_stats_rate_est est;
254         int res;
255 
256         if (!gen_estimator_read(rate_est, &sample))
257                 return 0;
258         est.bps = min_t(u64, UINT_MAX, sample.bps);
259         /* we have some time before reaching 2^32 packets per second */
260         est.pps = sample.pps;
261 
262         if (d->compat_tc_stats) {
263                 d->tc_stats.bps = est.bps;
264                 d->tc_stats.pps = est.pps;
265         }
266 
267         if (d->tail) {
268                 res = gnet_stats_copy(d, TCA_STATS_RATE_EST, &est, sizeof(est),
269                                       TCA_STATS_PAD);
270                 if (res < 0 || est.bps == sample.bps)
271                         return res;
272                 /* emit 64bit stats only if needed */
273                 return gnet_stats_copy(d, TCA_STATS_RATE_EST64, &sample,
274                                        sizeof(sample), TCA_STATS_PAD);
275         }
276 
277         return 0;
278 }
279 EXPORT_SYMBOL(gnet_stats_copy_rate_est);
280 
281 static void
282 __gnet_stats_copy_queue_cpu(struct gnet_stats_queue *qstats,
283                             const struct gnet_stats_queue __percpu *q)
284 {
285         int i;
286 
287         for_each_possible_cpu(i) {
288                 const struct gnet_stats_queue *qcpu = per_cpu_ptr(q, i);
289 
290                 qstats->qlen = 0;
291                 qstats->backlog += qcpu->backlog;
292                 qstats->drops += qcpu->drops;
293                 qstats->requeues += qcpu->requeues;
294                 qstats->overlimits += qcpu->overlimits;
295         }
296 }
297 
298 void __gnet_stats_copy_queue(struct gnet_stats_queue *qstats,
299                              const struct gnet_stats_queue __percpu *cpu,
300                              const struct gnet_stats_queue *q,
301                              __u32 qlen)
302 {
303         if (cpu) {
304                 __gnet_stats_copy_queue_cpu(qstats, cpu);
305         } else {
306                 qstats->qlen = q->qlen;
307                 qstats->backlog = q->backlog;
308                 qstats->drops = q->drops;
309                 qstats->requeues = q->requeues;
310                 qstats->overlimits = q->overlimits;
311         }
312 
313         qstats->qlen = qlen;
314 }
315 EXPORT_SYMBOL(__gnet_stats_copy_queue);
316 
317 /**
318  * gnet_stats_copy_queue - copy queue statistics into statistics TLV
319  * @d: dumping handle
320  * @cpu_q: per cpu queue statistics
321  * @q: queue statistics
322  * @qlen: queue length statistics
323  *
324  * Appends the queue statistics to the top level TLV created by
325  * gnet_stats_start_copy(). Using per cpu queue statistics if
326  * they are available.
327  *
328  * Returns 0 on success or -1 with the statistic lock released
329  * if the room in the socket buffer was not sufficient.
330  */
331 int
332 gnet_stats_copy_queue(struct gnet_dump *d,
333                       struct gnet_stats_queue __percpu *cpu_q,
334                       struct gnet_stats_queue *q, __u32 qlen)
335 {
336         struct gnet_stats_queue qstats = {0};
337 
338         __gnet_stats_copy_queue(&qstats, cpu_q, q, qlen);
339 
340         if (d->compat_tc_stats) {
341                 d->tc_stats.drops = qstats.drops;
342                 d->tc_stats.qlen = qstats.qlen;
343                 d->tc_stats.backlog = qstats.backlog;
344                 d->tc_stats.overlimits = qstats.overlimits;
345         }
346 
347         if (d->tail)
348                 return gnet_stats_copy(d, TCA_STATS_QUEUE,
349                                        &qstats, sizeof(qstats),
350                                        TCA_STATS_PAD);
351 
352         return 0;
353 }
354 EXPORT_SYMBOL(gnet_stats_copy_queue);
355 
356 /**
357  * gnet_stats_copy_app - copy application specific statistics into statistics TLV
358  * @d: dumping handle
359  * @st: application specific statistics data
360  * @len: length of data
361  *
362  * Appends the application specific statistics to the top level TLV created by
363  * gnet_stats_start_copy() and remembers the data for XSTATS if the dumping
364  * handle is in backward compatibility mode.
365  *
366  * Returns 0 on success or -1 with the statistic lock released
367  * if the room in the socket buffer was not sufficient.
368  */
369 int
370 gnet_stats_copy_app(struct gnet_dump *d, void *st, int len)
371 {
372         if (d->compat_xstats) {
373                 d->xstats = kmemdup(st, len, GFP_ATOMIC);
374                 if (!d->xstats)
375                         goto err_out;
376                 d->xstats_len = len;
377         }
378 
379         if (d->tail)
380                 return gnet_stats_copy(d, TCA_STATS_APP, st, len,
381                                        TCA_STATS_PAD);
382 
383         return 0;
384 
385 err_out:
386         if (d->lock)
387                 spin_unlock_bh(d->lock);
388         d->xstats_len = 0;
389         return -1;
390 }
391 EXPORT_SYMBOL(gnet_stats_copy_app);
392 
393 /**
394  * gnet_stats_finish_copy - finish dumping procedure
395  * @d: dumping handle
396  *
397  * Corrects the length of the top level TLV to include all TLVs added
398  * by gnet_stats_copy_XXX() calls. Adds the backward compatibility TLVs
399  * if gnet_stats_start_copy_compat() was used and releases the statistics
400  * lock.
401  *
402  * Returns 0 on success or -1 with the statistic lock released
403  * if the room in the socket buffer was not sufficient.
404  */
405 int
406 gnet_stats_finish_copy(struct gnet_dump *d)
407 {
408         if (d->tail)
409                 d->tail->nla_len = skb_tail_pointer(d->skb) - (u8 *)d->tail;
410 
411         if (d->compat_tc_stats)
412                 if (gnet_stats_copy(d, d->compat_tc_stats, &d->tc_stats,
413                                     sizeof(d->tc_stats), d->padattr) < 0)
414                         return -1;
415 
416         if (d->compat_xstats && d->xstats) {
417                 if (gnet_stats_copy(d, d->compat_xstats, d->xstats,
418                                     d->xstats_len, d->padattr) < 0)
419                         return -1;
420         }
421 
422         if (d->lock)
423                 spin_unlock_bh(d->lock);
424         kfree(d->xstats);
425         d->xstats = NULL;
426         d->xstats_len = 0;
427         return 0;
428 }
429 EXPORT_SYMBOL(gnet_stats_finish_copy);
430 

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