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 if (nla_put(d->skb, type, size, buf))
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
51 * Initializes the dumping handle, grabs the statistic lock and appends
52 * an empty TLV header to the socket buffer for use a container for all
53 * other statistic TLVS.
55 * The dumping handle is marked to be in backward compatibility mode telling
56 * all gnet_stats_copy_XXX() functions to fill a local copy of struct tc_stats.
58 * Returns 0 on success or -1 if the room in the socket buffer was not sufficient.
61 gnet_stats_start_copy_compat(struct sk_buff *skb, int type, int tc_stats_type,
62 int xstats_type, spinlock_t *lock, struct gnet_dump *d)
65 memset(d, 0, sizeof(*d));
70 d->tail = (struct nlattr *)skb_tail_pointer(skb);
72 d->compat_tc_stats = tc_stats_type;
73 d->compat_xstats = xstats_type;
76 return gnet_stats_copy(d, type, NULL, 0);
80 EXPORT_SYMBOL(gnet_stats_start_copy_compat);
83 * gnet_stats_start_copy_compat - start dumping procedure in compatibility mode
84 * @skb: socket buffer to put statistics TLVs into
85 * @type: TLV type for top level statistic TLV
86 * @lock: statistics lock
89 * Initializes the dumping handle, grabs the statistic lock and appends
90 * an empty TLV header to the socket buffer for use a container for all
91 * other statistic TLVS.
93 * Returns 0 on success or -1 if the room in the socket buffer was not sufficient.
96 gnet_stats_start_copy(struct sk_buff *skb, int type, spinlock_t *lock,
99 return gnet_stats_start_copy_compat(skb, type, 0, 0, lock, d);
101 EXPORT_SYMBOL(gnet_stats_start_copy);
104 * gnet_stats_copy_basic - copy basic statistics into statistic TLV
106 * @b: basic statistics
108 * Appends the basic statistics to the top level TLV created by
109 * gnet_stats_start_copy().
111 * Returns 0 on success or -1 with the statistic lock released
112 * if the room in the socket buffer was not sufficient.
115 gnet_stats_copy_basic(struct gnet_dump *d, struct gnet_stats_basic_packed *b)
117 if (d->compat_tc_stats) {
118 d->tc_stats.bytes = b->bytes;
119 d->tc_stats.packets = b->packets;
123 struct gnet_stats_basic sb;
125 memset(&sb, 0, sizeof(sb));
127 sb.packets = b->packets;
128 return gnet_stats_copy(d, TCA_STATS_BASIC, &sb, sizeof(sb));
132 EXPORT_SYMBOL(gnet_stats_copy_basic);
135 * gnet_stats_copy_rate_est - copy rate estimator statistics into statistics TLV
137 * @b: basic statistics
138 * @r: rate estimator statistics
140 * Appends the rate estimator statistics to the top level TLV created by
141 * gnet_stats_start_copy().
143 * Returns 0 on success or -1 with the statistic lock released
144 * if the room in the socket buffer was not sufficient.
147 gnet_stats_copy_rate_est(struct gnet_dump *d,
148 const struct gnet_stats_basic_packed *b,
149 struct gnet_stats_rate_est *r)
151 if (b && !gen_estimator_active(b, r))
154 if (d->compat_tc_stats) {
155 d->tc_stats.bps = r->bps;
156 d->tc_stats.pps = r->pps;
160 return gnet_stats_copy(d, TCA_STATS_RATE_EST, r, sizeof(*r));
164 EXPORT_SYMBOL(gnet_stats_copy_rate_est);
167 * gnet_stats_copy_queue - copy queue statistics into statistics TLV
169 * @q: queue statistics
171 * Appends the queue statistics to the top level TLV created by
172 * gnet_stats_start_copy().
174 * Returns 0 on success or -1 with the statistic lock released
175 * if the room in the socket buffer was not sufficient.
178 gnet_stats_copy_queue(struct gnet_dump *d, struct gnet_stats_queue *q)
180 if (d->compat_tc_stats) {
181 d->tc_stats.drops = q->drops;
182 d->tc_stats.qlen = q->qlen;
183 d->tc_stats.backlog = q->backlog;
184 d->tc_stats.overlimits = q->overlimits;
188 return gnet_stats_copy(d, TCA_STATS_QUEUE, q, sizeof(*q));
192 EXPORT_SYMBOL(gnet_stats_copy_queue);
195 * gnet_stats_copy_app - copy application specific statistics into statistics TLV
197 * @st: application specific statistics data
198 * @len: length of data
200 * Appends the application sepecific statistics to the top level TLV created by
201 * gnet_stats_start_copy() and remembers the data for XSTATS if the dumping
202 * handle is in backward compatibility mode.
204 * Returns 0 on success or -1 with the statistic lock released
205 * if the room in the socket buffer was not sufficient.
208 gnet_stats_copy_app(struct gnet_dump *d, void *st, int len)
210 if (d->compat_xstats) {
211 d->xstats = kmemdup(st, len, GFP_ATOMIC);
218 return gnet_stats_copy(d, TCA_STATS_APP, st, len);
224 spin_unlock_bh(d->lock);
227 EXPORT_SYMBOL(gnet_stats_copy_app);
230 * gnet_stats_finish_copy - finish dumping procedure
233 * Corrects the length of the top level TLV to include all TLVs added
234 * by gnet_stats_copy_XXX() calls. Adds the backward compatibility TLVs
235 * if gnet_stats_start_copy_compat() was used and releases the statistics
238 * Returns 0 on success or -1 with the statistic lock released
239 * if the room in the socket buffer was not sufficient.
242 gnet_stats_finish_copy(struct gnet_dump *d)
245 d->tail->nla_len = skb_tail_pointer(d->skb) - (u8 *)d->tail;
247 if (d->compat_tc_stats)
248 if (gnet_stats_copy(d, d->compat_tc_stats, &d->tc_stats,
249 sizeof(d->tc_stats)) < 0)
252 if (d->compat_xstats && d->xstats) {
253 if (gnet_stats_copy(d, d->compat_xstats, d->xstats,
261 spin_unlock_bh(d->lock);
264 EXPORT_SYMBOL(gnet_stats_finish_copy);