drivers:misc:ti-st: remove rfkill dependency
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / core / gen_stats.c
blob0452eb27a2724dcd3782f5acb15be04e7efba47e
1 /*
2 * net/core/gen_stats.c
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>
10 * Jamal Hadi Salim
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>
27 static inline int
28 gnet_stats_copy(struct gnet_dump *d, int type, void *buf, int size)
30 NLA_PUT(d->skb, type, size, buf);
31 return 0;
33 nla_put_failure:
34 spin_unlock_bh(d->lock);
35 return -1;
38 /**
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
45 * @d: dumping handle
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.
56 int
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)
59 __acquires(lock)
61 memset(d, 0, sizeof(*d));
63 spin_lock_bh(lock);
64 d->lock = lock;
65 if (type)
66 d->tail = (struct nlattr *)skb_tail_pointer(skb);
67 d->skb = skb;
68 d->compat_tc_stats = tc_stats_type;
69 d->compat_xstats = xstats_type;
71 if (d->tail)
72 return gnet_stats_copy(d, type, NULL, 0);
74 return 0;
76 EXPORT_SYMBOL(gnet_stats_start_copy_compat);
78 /**
79 * gnet_stats_start_copy_compat - start dumping procedure in compatibility mode
80 * @skb: socket buffer to put statistics TLVs into
81 * @type: TLV type for top level statistic TLV
82 * @lock: statistics lock
83 * @d: dumping handle
85 * Initializes the dumping handle, grabs the statistic lock and appends
86 * an empty TLV header to the socket buffer for use a container for all
87 * other statistic TLVS.
89 * Returns 0 on success or -1 if the room in the socket buffer was not sufficient.
91 int
92 gnet_stats_start_copy(struct sk_buff *skb, int type, spinlock_t *lock,
93 struct gnet_dump *d)
95 return gnet_stats_start_copy_compat(skb, type, 0, 0, lock, d);
97 EXPORT_SYMBOL(gnet_stats_start_copy);
99 /**
100 * gnet_stats_copy_basic - copy basic statistics into statistic TLV
101 * @d: dumping handle
102 * @b: basic statistics
104 * Appends the basic statistics to the top level TLV created by
105 * gnet_stats_start_copy().
107 * Returns 0 on success or -1 with the statistic lock released
108 * if the room in the socket buffer was not sufficient.
111 gnet_stats_copy_basic(struct gnet_dump *d, struct gnet_stats_basic_packed *b)
113 if (d->compat_tc_stats) {
114 d->tc_stats.bytes = b->bytes;
115 d->tc_stats.packets = b->packets;
118 if (d->tail) {
119 struct gnet_stats_basic sb;
121 memset(&sb, 0, sizeof(sb));
122 sb.bytes = b->bytes;
123 sb.packets = b->packets;
124 return gnet_stats_copy(d, TCA_STATS_BASIC, &sb, sizeof(sb));
126 return 0;
128 EXPORT_SYMBOL(gnet_stats_copy_basic);
131 * gnet_stats_copy_rate_est - copy rate estimator statistics into statistics TLV
132 * @d: dumping handle
133 * @b: basic statistics
134 * @r: rate estimator statistics
136 * Appends the rate estimator statistics to the top level TLV created by
137 * gnet_stats_start_copy().
139 * Returns 0 on success or -1 with the statistic lock released
140 * if the room in the socket buffer was not sufficient.
143 gnet_stats_copy_rate_est(struct gnet_dump *d,
144 const struct gnet_stats_basic_packed *b,
145 struct gnet_stats_rate_est *r)
147 if (b && !gen_estimator_active(b, r))
148 return 0;
150 if (d->compat_tc_stats) {
151 d->tc_stats.bps = r->bps;
152 d->tc_stats.pps = r->pps;
155 if (d->tail)
156 return gnet_stats_copy(d, TCA_STATS_RATE_EST, r, sizeof(*r));
158 return 0;
160 EXPORT_SYMBOL(gnet_stats_copy_rate_est);
163 * gnet_stats_copy_queue - copy queue statistics into statistics TLV
164 * @d: dumping handle
165 * @q: queue statistics
167 * Appends the queue statistics to the top level TLV created by
168 * gnet_stats_start_copy().
170 * Returns 0 on success or -1 with the statistic lock released
171 * if the room in the socket buffer was not sufficient.
174 gnet_stats_copy_queue(struct gnet_dump *d, struct gnet_stats_queue *q)
176 if (d->compat_tc_stats) {
177 d->tc_stats.drops = q->drops;
178 d->tc_stats.qlen = q->qlen;
179 d->tc_stats.backlog = q->backlog;
180 d->tc_stats.overlimits = q->overlimits;
183 if (d->tail)
184 return gnet_stats_copy(d, TCA_STATS_QUEUE, q, sizeof(*q));
186 return 0;
188 EXPORT_SYMBOL(gnet_stats_copy_queue);
191 * gnet_stats_copy_app - copy application specific statistics into statistics TLV
192 * @d: dumping handle
193 * @st: application specific statistics data
194 * @len: length of data
196 * Appends the application sepecific statistics to the top level TLV created by
197 * gnet_stats_start_copy() and remembers the data for XSTATS if the dumping
198 * handle is in backward compatibility mode.
200 * Returns 0 on success or -1 with the statistic lock released
201 * if the room in the socket buffer was not sufficient.
204 gnet_stats_copy_app(struct gnet_dump *d, void *st, int len)
206 if (d->compat_xstats) {
207 d->xstats = st;
208 d->xstats_len = len;
211 if (d->tail)
212 return gnet_stats_copy(d, TCA_STATS_APP, st, len);
214 return 0;
216 EXPORT_SYMBOL(gnet_stats_copy_app);
219 * gnet_stats_finish_copy - finish dumping procedure
220 * @d: dumping handle
222 * Corrects the length of the top level TLV to include all TLVs added
223 * by gnet_stats_copy_XXX() calls. Adds the backward compatibility TLVs
224 * if gnet_stats_start_copy_compat() was used and releases the statistics
225 * lock.
227 * Returns 0 on success or -1 with the statistic lock released
228 * if the room in the socket buffer was not sufficient.
231 gnet_stats_finish_copy(struct gnet_dump *d)
233 if (d->tail)
234 d->tail->nla_len = skb_tail_pointer(d->skb) - (u8 *)d->tail;
236 if (d->compat_tc_stats)
237 if (gnet_stats_copy(d, d->compat_tc_stats, &d->tc_stats,
238 sizeof(d->tc_stats)) < 0)
239 return -1;
241 if (d->compat_xstats && d->xstats) {
242 if (gnet_stats_copy(d, d->compat_xstats, d->xstats,
243 d->xstats_len) < 0)
244 return -1;
247 spin_unlock_bh(d->lock);
248 return 0;
250 EXPORT_SYMBOL(gnet_stats_finish_copy);