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1 | /* |
2 | * net/core/gen_stats.c |
3 | * |
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. |
8 | * |
9 | * Authors: Thomas Graf <tgraf@suug.ch> |
10 | * Jamal Hadi Salim |
11 | * Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> |
12 | * |
13 | * See Documentation/networking/gen_stats.txt |
14 | */ |
15 | |
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> |
25 | |
26 | |
27 | static inline int |
28 | gnet_stats_copy(struct gnet_dump *d, int type, void *buf, int size) |
29 | { |
30 | if (nla_put(d->skb, type, size, buf)) |
31 | goto nla_put_failure; |
32 | return 0; |
33 | |
34 | nla_put_failure: |
35 | spin_unlock_bh(d->lock); |
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 | * |
48 | * Initializes the dumping handle, grabs the statistic lock and appends |
49 | * an empty TLV header to the socket buffer for use a container for all |
50 | * other statistic TLVS. |
51 | * |
52 | * The dumping handle is marked to be in backward compatibility mode telling |
53 | * all gnet_stats_copy_XXX() functions to fill a local copy of struct tc_stats. |
54 | * |
55 | * Returns 0 on success or -1 if the room in the socket buffer was not sufficient. |
56 | */ |
57 | int |
58 | gnet_stats_start_copy_compat(struct sk_buff *skb, int type, int tc_stats_type, |
59 | int xstats_type, spinlock_t *lock, struct gnet_dump *d) |
60 | __acquires(lock) |
61 | { |
62 | memset(d, 0, sizeof(*d)); |
63 | |
64 | spin_lock_bh(lock); |
65 | d->lock = lock; |
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 | |
72 | if (d->tail) |
73 | return gnet_stats_copy(d, type, NULL, 0); |
74 | |
75 | return 0; |
76 | } |
77 | EXPORT_SYMBOL(gnet_stats_start_copy_compat); |
78 | |
79 | /** |
80 | * gnet_stats_start_copy_compat - start dumping procedure in compatibility mode |
81 | * @skb: socket buffer to put statistics TLVs into |
82 | * @type: TLV type for top level statistic TLV |
83 | * @lock: statistics lock |
84 | * @d: dumping handle |
85 | * |
86 | * Initializes the dumping handle, grabs the statistic lock and appends |
87 | * an empty TLV header to the socket buffer for use a container for all |
88 | * other statistic TLVS. |
89 | * |
90 | * Returns 0 on success or -1 if the room in the socket buffer was not sufficient. |
91 | */ |
92 | int |
93 | gnet_stats_start_copy(struct sk_buff *skb, int type, spinlock_t *lock, |
94 | struct gnet_dump *d) |
95 | { |
96 | return gnet_stats_start_copy_compat(skb, type, 0, 0, lock, d); |
97 | } |
98 | EXPORT_SYMBOL(gnet_stats_start_copy); |
99 | |
100 | /** |
101 | * gnet_stats_copy_basic - copy basic statistics into statistic TLV |
102 | * @d: dumping handle |
103 | * @b: basic statistics |
104 | * |
105 | * Appends the basic statistics to the top level TLV created by |
106 | * gnet_stats_start_copy(). |
107 | * |
108 | * Returns 0 on success or -1 with the statistic lock released |
109 | * if the room in the socket buffer was not sufficient. |
110 | */ |
111 | int |
112 | gnet_stats_copy_basic(struct gnet_dump *d, struct gnet_stats_basic_packed *b) |
113 | { |
114 | if (d->compat_tc_stats) { |
115 | d->tc_stats.bytes = b->bytes; |
116 | d->tc_stats.packets = b->packets; |
117 | } |
118 | |
119 | if (d->tail) { |
120 | struct gnet_stats_basic sb; |
121 | |
122 | memset(&sb, 0, sizeof(sb)); |
123 | sb.bytes = b->bytes; |
124 | sb.packets = b->packets; |
125 | return gnet_stats_copy(d, TCA_STATS_BASIC, &sb, sizeof(sb)); |
126 | } |
127 | return 0; |
128 | } |
129 | EXPORT_SYMBOL(gnet_stats_copy_basic); |
130 | |
131 | /** |
132 | * gnet_stats_copy_rate_est - copy rate estimator statistics into statistics TLV |
133 | * @d: dumping handle |
134 | * @b: basic statistics |
135 | * @r: rate estimator statistics |
136 | * |
137 | * Appends the rate estimator statistics to the top level TLV created by |
138 | * gnet_stats_start_copy(). |
139 | * |
140 | * Returns 0 on success or -1 with the statistic lock released |
141 | * if the room in the socket buffer was not sufficient. |
142 | */ |
143 | int |
144 | gnet_stats_copy_rate_est(struct gnet_dump *d, |
145 | const struct gnet_stats_basic_packed *b, |
146 | struct gnet_stats_rate_est64 *r) |
147 | { |
148 | struct gnet_stats_rate_est est; |
149 | int res; |
150 | |
151 | if (b && !gen_estimator_active(b, r)) |
152 | return 0; |
153 | |
154 | est.bps = min_t(u64, UINT_MAX, r->bps); |
155 | /* we have some time before reaching 2^32 packets per second */ |
156 | est.pps = r->pps; |
157 | |
158 | if (d->compat_tc_stats) { |
159 | d->tc_stats.bps = est.bps; |
160 | d->tc_stats.pps = est.pps; |
161 | } |
162 | |
163 | if (d->tail) { |
164 | res = gnet_stats_copy(d, TCA_STATS_RATE_EST, &est, sizeof(est)); |
165 | if (res < 0 || est.bps == r->bps) |
166 | return res; |
167 | /* emit 64bit stats only if needed */ |
168 | return gnet_stats_copy(d, TCA_STATS_RATE_EST64, r, sizeof(*r)); |
169 | } |
170 | |
171 | return 0; |
172 | } |
173 | EXPORT_SYMBOL(gnet_stats_copy_rate_est); |
174 | |
175 | /** |
176 | * gnet_stats_copy_queue - copy queue statistics into statistics TLV |
177 | * @d: dumping handle |
178 | * @q: queue statistics |
179 | * |
180 | * Appends the queue statistics to the top level TLV created by |
181 | * gnet_stats_start_copy(). |
182 | * |
183 | * Returns 0 on success or -1 with the statistic lock released |
184 | * if the room in the socket buffer was not sufficient. |
185 | */ |
186 | int |
187 | gnet_stats_copy_queue(struct gnet_dump *d, struct gnet_stats_queue *q) |
188 | { |
189 | if (d->compat_tc_stats) { |
190 | d->tc_stats.drops = q->drops; |
191 | d->tc_stats.qlen = q->qlen; |
192 | d->tc_stats.backlog = q->backlog; |
193 | d->tc_stats.overlimits = q->overlimits; |
194 | } |
195 | |
196 | if (d->tail) |
197 | return gnet_stats_copy(d, TCA_STATS_QUEUE, q, sizeof(*q)); |
198 | |
199 | return 0; |
200 | } |
201 | EXPORT_SYMBOL(gnet_stats_copy_queue); |
202 | |
203 | /** |
204 | * gnet_stats_copy_app - copy application specific statistics into statistics TLV |
205 | * @d: dumping handle |
206 | * @st: application specific statistics data |
207 | * @len: length of data |
208 | * |
209 | * Appends the application sepecific statistics to the top level TLV created by |
210 | * gnet_stats_start_copy() and remembers the data for XSTATS if the dumping |
211 | * handle is in backward compatibility mode. |
212 | * |
213 | * Returns 0 on success or -1 with the statistic lock released |
214 | * if the room in the socket buffer was not sufficient. |
215 | */ |
216 | int |
217 | gnet_stats_copy_app(struct gnet_dump *d, void *st, int len) |
218 | { |
219 | if (d->compat_xstats) { |
220 | d->xstats = st; |
221 | d->xstats_len = len; |
222 | } |
223 | |
224 | if (d->tail) |
225 | return gnet_stats_copy(d, TCA_STATS_APP, st, len); |
226 | |
227 | return 0; |
228 | } |
229 | EXPORT_SYMBOL(gnet_stats_copy_app); |
230 | |
231 | /** |
232 | * gnet_stats_finish_copy - finish dumping procedure |
233 | * @d: dumping handle |
234 | * |
235 | * Corrects the length of the top level TLV to include all TLVs added |
236 | * by gnet_stats_copy_XXX() calls. Adds the backward compatibility TLVs |
237 | * if gnet_stats_start_copy_compat() was used and releases the statistics |
238 | * lock. |
239 | * |
240 | * Returns 0 on success or -1 with the statistic lock released |
241 | * if the room in the socket buffer was not sufficient. |
242 | */ |
243 | int |
244 | gnet_stats_finish_copy(struct gnet_dump *d) |
245 | { |
246 | if (d->tail) |
247 | d->tail->nla_len = skb_tail_pointer(d->skb) - (u8 *)d->tail; |
248 | |
249 | if (d->compat_tc_stats) |
250 | if (gnet_stats_copy(d, d->compat_tc_stats, &d->tc_stats, |
251 | sizeof(d->tc_stats)) < 0) |
252 | return -1; |
253 | |
254 | if (d->compat_xstats && d->xstats) { |
255 | if (gnet_stats_copy(d, d->compat_xstats, d->xstats, |
256 | d->xstats_len) < 0) |
257 | return -1; |
258 | } |
259 | |
260 | spin_unlock_bh(d->lock); |
261 | return 0; |
262 | } |
263 | EXPORT_SYMBOL(gnet_stats_finish_copy); |
264 |
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