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, int padattr) 29 { 30 if (nla_put_64bit(d->skb, type, size, buf, padattr)) 31 goto nla_put_failure; 32 return 0; 33 34 nla_put_failure: 35 kfree(d->xstats); 36 d->xstats = NULL; 37 d->xstats_len = 0; 38 spin_unlock_bh(d->lock); 39 return -1; 40 } 41 42 /** 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 49 * @d: dumping handle 50 * @padattr: padding attribute 51 * 52 * Initializes the dumping handle, grabs the statistic lock and appends 53 * an empty TLV header to the socket buffer for use a container for all 54 * other statistic TLVS. 55 * 56 * The dumping handle is marked to be in backward compatibility mode telling 57 * all gnet_stats_copy_XXX() functions to fill a local copy of struct tc_stats. 58 * 59 * Returns 0 on success or -1 if the room in the socket buffer was not sufficient. 60 */ 61 int 62 gnet_stats_start_copy_compat(struct sk_buff *skb, int type, int tc_stats_type, 63 int xstats_type, spinlock_t *lock, 64 struct gnet_dump *d, int padattr) 65 __acquires(lock) 66 { 67 memset(d, 0, sizeof(*d)); 68 69 spin_lock_bh(lock); 70 d->lock = lock; 71 if (type) 72 d->tail = (struct nlattr *)skb_tail_pointer(skb); 73 d->skb = skb; 74 d->compat_tc_stats = tc_stats_type; 75 d->compat_xstats = xstats_type; 76 d->padattr = padattr; 77 78 if (d->tail) 79 return gnet_stats_copy(d, type, NULL, 0, padattr); 80 81 return 0; 82 } 83 EXPORT_SYMBOL(gnet_stats_start_copy_compat); 84 85 /** 86 * gnet_stats_start_copy - start dumping procedure in compatibility mode 87 * @skb: socket buffer to put statistics TLVs into 88 * @type: TLV type for top level statistic TLV 89 * @lock: statistics lock 90 * @d: dumping handle 91 * @padattr: padding attribute 92 * 93 * Initializes the dumping handle, grabs the statistic lock and appends 94 * an empty TLV header to the socket buffer for use a container for all 95 * other statistic TLVS. 96 * 97 * Returns 0 on success or -1 if the room in the socket buffer was not sufficient. 98 */ 99 int 100 gnet_stats_start_copy(struct sk_buff *skb, int type, spinlock_t *lock, 101 struct gnet_dump *d, int padattr) 102 { 103 return gnet_stats_start_copy_compat(skb, type, 0, 0, lock, d, padattr); 104 } 105 EXPORT_SYMBOL(gnet_stats_start_copy); 106 107 static void 108 __gnet_stats_copy_basic_cpu(struct gnet_stats_basic_packed *bstats, 109 struct gnet_stats_basic_cpu __percpu *cpu) 110 { 111 int i; 112 113 for_each_possible_cpu(i) { 114 struct gnet_stats_basic_cpu *bcpu = per_cpu_ptr(cpu, i); 115 unsigned int start; 116 u64 bytes; 117 u32 packets; 118 119 do { 120 start = u64_stats_fetch_begin_irq(&bcpu->syncp); 121 bytes = bcpu->bstats.bytes; 122 packets = bcpu->bstats.packets; 123 } while (u64_stats_fetch_retry_irq(&bcpu->syncp, start)); 124 125 bstats->bytes += bytes; 126 bstats->packets += packets; 127 } 128 } 129 130 void 131 __gnet_stats_copy_basic(struct gnet_stats_basic_packed *bstats, 132 struct gnet_stats_basic_cpu __percpu *cpu, 133 struct gnet_stats_basic_packed *b) 134 { 135 if (cpu) { 136 __gnet_stats_copy_basic_cpu(bstats, cpu); 137 } else { 138 bstats->bytes = b->bytes; 139 bstats->packets = b->packets; 140 } 141 } 142 EXPORT_SYMBOL(__gnet_stats_copy_basic); 143 144 /** 145 * gnet_stats_copy_basic - copy basic statistics into statistic TLV 146 * @d: dumping handle 147 * @cpu: copy statistic per cpu 148 * @b: basic statistics 149 * 150 * Appends the basic statistics to the top level TLV created by 151 * gnet_stats_start_copy(). 152 * 153 * Returns 0 on success or -1 with the statistic lock released 154 * if the room in the socket buffer was not sufficient. 155 */ 156 int 157 gnet_stats_copy_basic(struct gnet_dump *d, 158 struct gnet_stats_basic_cpu __percpu *cpu, 159 struct gnet_stats_basic_packed *b) 160 { 161 struct gnet_stats_basic_packed bstats = {0}; 162 163 __gnet_stats_copy_basic(&bstats, cpu, b); 164 165 if (d->compat_tc_stats) { 166 d->tc_stats.bytes = bstats.bytes; 167 d->tc_stats.packets = bstats.packets; 168 } 169 170 if (d->tail) { 171 struct gnet_stats_basic sb; 172 173 memset(&sb, 0, sizeof(sb)); 174 sb.bytes = bstats.bytes; 175 sb.packets = bstats.packets; 176 return gnet_stats_copy(d, TCA_STATS_BASIC, &sb, sizeof(sb), 177 TCA_STATS_PAD); 178 } 179 return 0; 180 } 181 EXPORT_SYMBOL(gnet_stats_copy_basic); 182 183 /** 184 * gnet_stats_copy_rate_est - copy rate estimator statistics into statistics TLV 185 * @d: dumping handle 186 * @b: basic statistics 187 * @r: rate estimator statistics 188 * 189 * Appends the rate estimator statistics to the top level TLV created by 190 * gnet_stats_start_copy(). 191 * 192 * Returns 0 on success or -1 with the statistic lock released 193 * if the room in the socket buffer was not sufficient. 194 */ 195 int 196 gnet_stats_copy_rate_est(struct gnet_dump *d, 197 const struct gnet_stats_basic_packed *b, 198 struct gnet_stats_rate_est64 *r) 199 { 200 struct gnet_stats_rate_est est; 201 int res; 202 203 if (b && !gen_estimator_active(b, r)) 204 return 0; 205 206 est.bps = min_t(u64, UINT_MAX, r->bps); 207 /* we have some time before reaching 2^32 packets per second */ 208 est.pps = r->pps; 209 210 if (d->compat_tc_stats) { 211 d->tc_stats.bps = est.bps; 212 d->tc_stats.pps = est.pps; 213 } 214 215 if (d->tail) { 216 res = gnet_stats_copy(d, TCA_STATS_RATE_EST, &est, sizeof(est), 217 TCA_STATS_PAD); 218 if (res < 0 || est.bps == r->bps) 219 return res; 220 /* emit 64bit stats only if needed */ 221 return gnet_stats_copy(d, TCA_STATS_RATE_EST64, r, sizeof(*r), 222 TCA_STATS_PAD); 223 } 224 225 return 0; 226 } 227 EXPORT_SYMBOL(gnet_stats_copy_rate_est); 228 229 static void 230 __gnet_stats_copy_queue_cpu(struct gnet_stats_queue *qstats, 231 const struct gnet_stats_queue __percpu *q) 232 { 233 int i; 234 235 for_each_possible_cpu(i) { 236 const struct gnet_stats_queue *qcpu = per_cpu_ptr(q, i); 237 238 qstats->qlen = 0; 239 qstats->backlog += qcpu->backlog; 240 qstats->drops += qcpu->drops; 241 qstats->requeues += qcpu->requeues; 242 qstats->overlimits += qcpu->overlimits; 243 } 244 } 245 246 static void __gnet_stats_copy_queue(struct gnet_stats_queue *qstats, 247 const struct gnet_stats_queue __percpu *cpu, 248 const struct gnet_stats_queue *q, 249 __u32 qlen) 250 { 251 if (cpu) { 252 __gnet_stats_copy_queue_cpu(qstats, cpu); 253 } else { 254 qstats->qlen = q->qlen; 255 qstats->backlog = q->backlog; 256 qstats->drops = q->drops; 257 qstats->requeues = q->requeues; 258 qstats->overlimits = q->overlimits; 259 } 260 261 qstats->qlen = qlen; 262 } 263 264 /** 265 * gnet_stats_copy_queue - copy queue statistics into statistics TLV 266 * @d: dumping handle 267 * @cpu_q: per cpu queue statistics 268 * @q: queue statistics 269 * @qlen: queue length statistics 270 * 271 * Appends the queue statistics to the top level TLV created by 272 * gnet_stats_start_copy(). Using per cpu queue statistics if 273 * they are available. 274 * 275 * Returns 0 on success or -1 with the statistic lock released 276 * if the room in the socket buffer was not sufficient. 277 */ 278 int 279 gnet_stats_copy_queue(struct gnet_dump *d, 280 struct gnet_stats_queue __percpu *cpu_q, 281 struct gnet_stats_queue *q, __u32 qlen) 282 { 283 struct gnet_stats_queue qstats = {0}; 284 285 __gnet_stats_copy_queue(&qstats, cpu_q, q, qlen); 286 287 if (d->compat_tc_stats) { 288 d->tc_stats.drops = qstats.drops; 289 d->tc_stats.qlen = qstats.qlen; 290 d->tc_stats.backlog = qstats.backlog; 291 d->tc_stats.overlimits = qstats.overlimits; 292 } 293 294 if (d->tail) 295 return gnet_stats_copy(d, TCA_STATS_QUEUE, 296 &qstats, sizeof(qstats), 297 TCA_STATS_PAD); 298 299 return 0; 300 } 301 EXPORT_SYMBOL(gnet_stats_copy_queue); 302 303 /** 304 * gnet_stats_copy_app - copy application specific statistics into statistics TLV 305 * @d: dumping handle 306 * @st: application specific statistics data 307 * @len: length of data 308 * 309 * Appends the application specific statistics to the top level TLV created by 310 * gnet_stats_start_copy() and remembers the data for XSTATS if the dumping 311 * handle is in backward compatibility mode. 312 * 313 * Returns 0 on success or -1 with the statistic lock released 314 * if the room in the socket buffer was not sufficient. 315 */ 316 int 317 gnet_stats_copy_app(struct gnet_dump *d, void *st, int len) 318 { 319 if (d->compat_xstats) { 320 d->xstats = kmemdup(st, len, GFP_ATOMIC); 321 if (!d->xstats) 322 goto err_out; 323 d->xstats_len = len; 324 } 325 326 if (d->tail) 327 return gnet_stats_copy(d, TCA_STATS_APP, st, len, 328 TCA_STATS_PAD); 329 330 return 0; 331 332 err_out: 333 d->xstats_len = 0; 334 spin_unlock_bh(d->lock); 335 return -1; 336 } 337 EXPORT_SYMBOL(gnet_stats_copy_app); 338 339 /** 340 * gnet_stats_finish_copy - finish dumping procedure 341 * @d: dumping handle 342 * 343 * Corrects the length of the top level TLV to include all TLVs added 344 * by gnet_stats_copy_XXX() calls. Adds the backward compatibility TLVs 345 * if gnet_stats_start_copy_compat() was used and releases the statistics 346 * lock. 347 * 348 * Returns 0 on success or -1 with the statistic lock released 349 * if the room in the socket buffer was not sufficient. 350 */ 351 int 352 gnet_stats_finish_copy(struct gnet_dump *d) 353 { 354 if (d->tail) 355 d->tail->nla_len = skb_tail_pointer(d->skb) - (u8 *)d->tail; 356 357 if (d->compat_tc_stats) 358 if (gnet_stats_copy(d, d->compat_tc_stats, &d->tc_stats, 359 sizeof(d->tc_stats), d->padattr) < 0) 360 return -1; 361 362 if (d->compat_xstats && d->xstats) { 363 if (gnet_stats_copy(d, d->compat_xstats, d->xstats, 364 d->xstats_len, d->padattr) < 0) 365 return -1; 366 } 367 368 kfree(d->xstats); 369 d->xstats = NULL; 370 d->xstats_len = 0; 371 spin_unlock_bh(d->lock); 372 return 0; 373 } 374 EXPORT_SYMBOL(gnet_stats_finish_copy); 375