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)
30 NLA_PUT(d->skb, type, size, buf);
37 spin_unlock_bh(d->lock);
42 * gnet_stats_start_copy_compat - start dumping procedure in compatibility mode
43 * @skb: socket buffer to put statistics TLVs into
44 * @type: TLV type for top level statistic TLV
45 * @tc_stats_type: TLV type for backward compatibility struct tc_stats TLV
46 * @xstats_type: TLV type for backward compatibility xstats TLV
47 * @lock: statistics lock
50 * Initializes the dumping handle, grabs the statistic lock and appends
51 * an empty TLV header to the socket buffer for use a container for all
52 * other statistic TLVS.
54 * The dumping handle is marked to be in backward compatibility mode telling
55 * all gnet_stats_copy_XXX() functions to fill a local copy of struct tc_stats.
57 * Returns 0 on success or -1 if the room in the socket buffer was not sufficient.
60 gnet_stats_start_copy_compat(struct sk_buff *skb, int type, int tc_stats_type,
61 int xstats_type, spinlock_t *lock, struct gnet_dump *d)
64 memset(d, 0, sizeof(*d));
69 d->tail = (struct nlattr *)skb_tail_pointer(skb);
71 d->compat_tc_stats = tc_stats_type;
72 d->compat_xstats = xstats_type;
75 return gnet_stats_copy(d, type, NULL, 0);
79 EXPORT_SYMBOL(gnet_stats_start_copy_compat);
82 * gnet_stats_start_copy_compat - start dumping procedure in compatibility mode
83 * @skb: socket buffer to put statistics TLVs into
84 * @type: TLV type for top level statistic TLV
85 * @lock: statistics lock
88 * Initializes the dumping handle, grabs the statistic lock and appends
89 * an empty TLV header to the socket buffer for use a container for all
90 * other statistic TLVS.
92 * Returns 0 on success or -1 if the room in the socket buffer was not sufficient.
95 gnet_stats_start_copy(struct sk_buff *skb, int type, spinlock_t *lock,
98 return gnet_stats_start_copy_compat(skb, type, 0, 0, lock, d);
100 EXPORT_SYMBOL(gnet_stats_start_copy);
103 * gnet_stats_copy_basic - copy basic statistics into statistic TLV
105 * @b: basic statistics
107 * Appends the basic statistics to the top level TLV created by
108 * gnet_stats_start_copy().
110 * Returns 0 on success or -1 with the statistic lock released
111 * if the room in the socket buffer was not sufficient.
114 gnet_stats_copy_basic(struct gnet_dump *d, struct gnet_stats_basic_packed *b)
116 if (d->compat_tc_stats) {
117 d->tc_stats.bytes = b->bytes;
118 d->tc_stats.packets = b->packets;
122 struct gnet_stats_basic sb;
124 memset(&sb, 0, sizeof(sb));
126 sb.packets = b->packets;
127 return gnet_stats_copy(d, TCA_STATS_BASIC, &sb, sizeof(sb));
131 EXPORT_SYMBOL(gnet_stats_copy_basic);
134 * gnet_stats_copy_rate_est - copy rate estimator statistics into statistics TLV
136 * @b: basic statistics
137 * @r: rate estimator statistics
139 * Appends the rate estimator statistics to the top level TLV created by
140 * gnet_stats_start_copy().
142 * Returns 0 on success or -1 with the statistic lock released
143 * if the room in the socket buffer was not sufficient.
146 gnet_stats_copy_rate_est(struct gnet_dump *d,
147 const struct gnet_stats_basic_packed *b,
148 struct gnet_stats_rate_est *r)
150 if (b && !gen_estimator_active(b, r))
153 if (d->compat_tc_stats) {
154 d->tc_stats.bps = r->bps;
155 d->tc_stats.pps = r->pps;
159 return gnet_stats_copy(d, TCA_STATS_RATE_EST, r, sizeof(*r));
163 EXPORT_SYMBOL(gnet_stats_copy_rate_est);
166 * gnet_stats_copy_queue - copy queue statistics into statistics TLV
168 * @q: queue statistics
170 * Appends the queue statistics to the top level TLV created by
171 * gnet_stats_start_copy().
173 * Returns 0 on success or -1 with the statistic lock released
174 * if the room in the socket buffer was not sufficient.
177 gnet_stats_copy_queue(struct gnet_dump *d, struct gnet_stats_queue *q)
179 if (d->compat_tc_stats) {
180 d->tc_stats.drops = q->drops;
181 d->tc_stats.qlen = q->qlen;
182 d->tc_stats.backlog = q->backlog;
183 d->tc_stats.overlimits = q->overlimits;
187 return gnet_stats_copy(d, TCA_STATS_QUEUE, q, sizeof(*q));
191 EXPORT_SYMBOL(gnet_stats_copy_queue);
194 * gnet_stats_copy_app - copy application specific statistics into statistics TLV
196 * @st: application specific statistics data
197 * @len: length of data
199 * Appends the application sepecific statistics to the top level TLV created by
200 * gnet_stats_start_copy() and remembers the data for XSTATS if the dumping
201 * handle is in backward compatibility mode.
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_app(struct gnet_dump *d, void *st, int len)
209 if (d->compat_xstats) {
210 d->xstats = kmemdup(st, len, GFP_ATOMIC);
217 return gnet_stats_copy(d, TCA_STATS_APP, st, len);
223 spin_unlock_bh(d->lock);
226 EXPORT_SYMBOL(gnet_stats_copy_app);
229 * gnet_stats_finish_copy - finish dumping procedure
232 * Corrects the length of the top level TLV to include all TLVs added
233 * by gnet_stats_copy_XXX() calls. Adds the backward compatibility TLVs
234 * if gnet_stats_start_copy_compat() was used and releases the statistics
237 * Returns 0 on success or -1 with the statistic lock released
238 * if the room in the socket buffer was not sufficient.
241 gnet_stats_finish_copy(struct gnet_dump *d)
244 d->tail->nla_len = skb_tail_pointer(d->skb) - (u8 *)d->tail;
246 if (d->compat_tc_stats)
247 if (gnet_stats_copy(d, d->compat_tc_stats, &d->tc_stats,
248 sizeof(d->tc_stats)) < 0)
251 if (d->compat_xstats && d->xstats) {
252 if (gnet_stats_copy(d, d->compat_xstats, d->xstats,
260 spin_unlock_bh(d->lock);
263 EXPORT_SYMBOL(gnet_stats_finish_copy);