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);
34 spin_unlock_bh(d->lock);
39 * gnet_stats_start_copy_compat - start dumping procedure in compatibility mode
40 * @skb: socket buffer to put statistics TLVs into
41 * @type: TLV type for top level statistic TLV
42 * @tc_stats_type: TLV type for backward compatibility struct tc_stats TLV
43 * @xstats_type: TLV type for backward compatibility xstats TLV
44 * @lock: statistics lock
47 * Initializes the dumping handle, grabs the statistic lock and appends
48 * an empty TLV header to the socket buffer for use a container for all
49 * other statistic TLVS.
51 * The dumping handle is marked to be in backward compatibility mode telling
52 * all gnet_stats_copy_XXX() functions to fill a local copy of struct tc_stats.
54 * Returns 0 on success or -1 if the room in the socket buffer was not sufficient.
57 gnet_stats_start_copy_compat(struct sk_buff *skb, int type, int tc_stats_type,
58 int xstats_type, spinlock_t *lock, struct gnet_dump *d)
61 memset(d, 0, sizeof(*d));
66 d->tail = (struct nlattr *)skb_tail_pointer(skb);
68 d->compat_tc_stats = tc_stats_type;
69 d->compat_xstats = xstats_type;
72 return gnet_stats_copy(d, type, NULL, 0);
78 * gnet_stats_start_copy_compat - start dumping procedure in compatibility mode
79 * @skb: socket buffer to put statistics TLVs into
80 * @type: TLV type for top level statistic TLV
81 * @lock: statistics lock
84 * Initializes the dumping handle, grabs the statistic lock and appends
85 * an empty TLV header to the socket buffer for use a container for all
86 * other statistic TLVS.
88 * Returns 0 on success or -1 if the room in the socket buffer was not sufficient.
91 gnet_stats_start_copy(struct sk_buff *skb, int type, spinlock_t *lock,
94 return gnet_stats_start_copy_compat(skb, type, 0, 0, lock, d);
98 * gnet_stats_copy_basic - copy basic statistics into statistic TLV
100 * @b: basic statistics
102 * Appends the basic statistics to the top level TLV created by
103 * gnet_stats_start_copy().
105 * Returns 0 on success or -1 with the statistic lock released
106 * if the room in the socket buffer was not sufficient.
109 gnet_stats_copy_basic(struct gnet_dump *d, struct gnet_stats_basic *b)
111 if (d->compat_tc_stats) {
112 d->tc_stats.bytes = b->bytes;
113 d->tc_stats.packets = b->packets;
117 return gnet_stats_copy(d, TCA_STATS_BASIC, b, sizeof(*b));
123 * gnet_stats_copy_rate_est - copy rate estimator statistics into statistics TLV
125 * @r: rate estimator statistics
127 * Appends the rate estimator statistics to the top level TLV created by
128 * gnet_stats_start_copy().
130 * Returns 0 on success or -1 with the statistic lock released
131 * if the room in the socket buffer was not sufficient.
134 gnet_stats_copy_rate_est(struct gnet_dump *d, struct gnet_stats_rate_est *r)
136 if (d->compat_tc_stats) {
137 d->tc_stats.bps = r->bps;
138 d->tc_stats.pps = r->pps;
142 return gnet_stats_copy(d, TCA_STATS_RATE_EST, r, sizeof(*r));
148 * gnet_stats_copy_queue - copy queue statistics into statistics TLV
150 * @q: queue statistics
152 * Appends the queue statistics to the top level TLV created by
153 * gnet_stats_start_copy().
155 * Returns 0 on success or -1 with the statistic lock released
156 * if the room in the socket buffer was not sufficient.
159 gnet_stats_copy_queue(struct gnet_dump *d, struct gnet_stats_queue *q)
161 if (d->compat_tc_stats) {
162 d->tc_stats.drops = q->drops;
163 d->tc_stats.qlen = q->qlen;
164 d->tc_stats.backlog = q->backlog;
165 d->tc_stats.overlimits = q->overlimits;
169 return gnet_stats_copy(d, TCA_STATS_QUEUE, q, sizeof(*q));
175 * gnet_stats_copy_app - copy application specific statistics into statistics TLV
177 * @st: application specific statistics data
178 * @len: length of data
180 * Appends the application sepecific statistics to the top level TLV created by
181 * gnet_stats_start_copy() and remembers the data for XSTATS if the dumping
182 * handle is in backward compatibility mode.
184 * Returns 0 on success or -1 with the statistic lock released
185 * if the room in the socket buffer was not sufficient.
188 gnet_stats_copy_app(struct gnet_dump *d, void *st, int len)
190 if (d->compat_xstats) {
196 return gnet_stats_copy(d, TCA_STATS_APP, st, len);
202 * gnet_stats_finish_copy - finish dumping procedure
205 * Corrects the length of the top level TLV to include all TLVs added
206 * by gnet_stats_copy_XXX() calls. Adds the backward compatibility TLVs
207 * if gnet_stats_start_copy_compat() was used and releases the statistics
210 * Returns 0 on success or -1 with the statistic lock released
211 * if the room in the socket buffer was not sufficient.
214 gnet_stats_finish_copy(struct gnet_dump *d)
217 d->tail->nla_len = skb_tail_pointer(d->skb) - (u8 *)d->tail;
219 if (d->compat_tc_stats)
220 if (gnet_stats_copy(d, d->compat_tc_stats, &d->tc_stats,
221 sizeof(d->tc_stats)) < 0)
224 if (d->compat_xstats && d->xstats) {
225 if (gnet_stats_copy(d, d->compat_xstats, d->xstats,
230 spin_unlock_bh(d->lock);
235 EXPORT_SYMBOL(gnet_stats_start_copy);
236 EXPORT_SYMBOL(gnet_stats_start_copy_compat);
237 EXPORT_SYMBOL(gnet_stats_copy_basic);
238 EXPORT_SYMBOL(gnet_stats_copy_rate_est);
239 EXPORT_SYMBOL(gnet_stats_copy_queue);
240 EXPORT_SYMBOL(gnet_stats_copy_app);
241 EXPORT_SYMBOL(gnet_stats_finish_copy);