net/sunrpc/stats.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * linux/net/sunrpc/stats.c
   4  *
   5  * procfs-based user access to generic RPC statistics. The stats files
   6  * reside in /proc/net/rpc.
   7  *
   8  * The read routines assume that the buffer passed in is just big enough.
   9  * If you implement an RPC service that has its own stats routine which
  10  * appends the generic RPC stats, make sure you don't exceed the PAGE_SIZE
  11  * limit.
  12  *
  13  * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
  14  */
  15
  16 #include <linux/module.h>
  17 #include <linux/slab.h>
  18
  19 #include <linux/init.h>
  20 #include <linux/kernel.h>
  21 #include <linux/proc_fs.h>
  22 #include <linux/seq_file.h>
  23 #include <linux/sunrpc/clnt.h>
  24 #include <linux/sunrpc/svcsock.h>
  25 #include <linux/sunrpc/metrics.h>
  26 #include <linux/rcupdate.h>
  27
  28 #include <trace/events/sunrpc.h>
  29
  30 #include "netns.h"
  31
  32 #define RPCDBG_FACILITY RPCDBG_MISC
  33
  34 /*
  35  * Get RPC client stats
  36  */
  37 static int rpc_proc_show(struct seq_file *seq, void *v) {
  38         const struct rpc_stat   *statp = seq->private;
  39         const struct rpc_program *prog = statp->program;
  40         unsigned int i, j;
  41
  42         seq_printf(seq,
  43                 "net %u %u %u %u\n",
  44                         statp->netcnt,
  45                         statp->netudpcnt,
  46                         statp->nettcpcnt,
  47                         statp->nettcpconn);
  48         seq_printf(seq,
  49                 "rpc %u %u %u\n",
  50                         statp->rpccnt,
  51                         statp->rpcretrans,
  52                         statp->rpcauthrefresh);
  53
  54         for (i = 0; i < prog->nrvers; i++) {
  55                 const struct rpc_version *vers = prog->version[i];
  56                 if (!vers)
  57                         continue;
  58                 seq_printf(seq, "proc%u %u",
  59                                         vers->number, vers->nrprocs);
  60                 for (j = 0; j < vers->nrprocs; j++)
  61                         seq_printf(seq, " %u", vers->counts[j]);
  62                 seq_putc(seq, '\n');
  63         }
  64         return 0;
  65 }
  66
  67 static int rpc_proc_open(struct inode *inode, struct file *file)
  68 {
  69         return single_open(file, rpc_proc_show, PDE_DATA(inode));
  70 }
  71
  72 static const struct proc_ops rpc_proc_ops = {
  73         .proc_open      = rpc_proc_open,
  74         .proc_read      = seq_read,
  75         .proc_lseek     = seq_lseek,
  76         .proc_release   = single_release,
  77 };
  78
  79 /*
  80  * Get RPC server stats
  81  */
  82 void svc_seq_show(struct seq_file *seq, const struct svc_stat *statp)
  83 {
  84         const struct svc_program *prog = statp->program;
  85         const struct svc_version *vers;
  86         unsigned int i, j;
  87
  88         seq_printf(seq,
  89                 "net %u %u %u %u\n",
  90                         statp->netcnt,
  91                         statp->netudpcnt,
  92                         statp->nettcpcnt,
  93                         statp->nettcpconn);
  94         seq_printf(seq,
  95                 "rpc %u %u %u %u %u\n",
  96                         statp->rpccnt,
  97                         statp->rpcbadfmt+statp->rpcbadauth+statp->rpcbadclnt,
  98                         statp->rpcbadfmt,
  99                         statp->rpcbadauth,
 100                         statp->rpcbadclnt);
 101
 102         for (i = 0; i < prog->pg_nvers; i++) {
 103                 vers = prog->pg_vers[i];
 104                 if (!vers)
 105                         continue;
 106                 seq_printf(seq, "proc%d %u", i, vers->vs_nproc);
 107                 for (j = 0; j < vers->vs_nproc; j++)
 108                         seq_printf(seq, " %u", vers->vs_count[j]);
 109                 seq_putc(seq, '\n');
 110         }
 111 }
 112 EXPORT_SYMBOL_GPL(svc_seq_show);
 113
 114 /**
 115  * rpc_alloc_iostats - allocate an rpc_iostats structure
 116  * @clnt: RPC program, version, and xprt
 117  *
 118  */
 119 struct rpc_iostats *rpc_alloc_iostats(struct rpc_clnt *clnt)
 120 {
 121         struct rpc_iostats *stats;
 122         int i;
 123
 124         stats = kcalloc(clnt->cl_maxproc, sizeof(*stats), GFP_KERNEL);
 125         if (stats) {
 126                 for (i = 0; i < clnt->cl_maxproc; i++)
 127                         spin_lock_init(&stats[i].om_lock);
 128         }
 129         return stats;
 130 }
 131 EXPORT_SYMBOL_GPL(rpc_alloc_iostats);
 132
 133 /**
 134  * rpc_free_iostats - release an rpc_iostats structure
 135  * @stats: doomed rpc_iostats structure
 136  *
 137  */
 138 void rpc_free_iostats(struct rpc_iostats *stats)
 139 {
 140         kfree(stats);
 141 }
 142 EXPORT_SYMBOL_GPL(rpc_free_iostats);
 143
 144 /**
 145  * rpc_count_iostats_metrics - tally up per-task stats
 146  * @task: completed rpc_task
 147  * @op_metrics: stat structure for OP that will accumulate stats from @task
 148  */
 149 void rpc_count_iostats_metrics(const struct rpc_task *task,
 150                                struct rpc_iostats *op_metrics)
 151 {
 152         struct rpc_rqst *req = task->tk_rqstp;
 153         ktime_t backlog, execute, now;
 154
 155         if (!op_metrics || !req)
 156                 return;
 157
 158         now = ktime_get();
 159         spin_lock(&op_metrics->om_lock);
 160
 161         op_metrics->om_ops++;
 162         /* kernel API: om_ops must never become larger than om_ntrans */
 163         op_metrics->om_ntrans += max(req->rq_ntrans, 1);
 164         op_metrics->om_timeouts += task->tk_timeouts;
 165
 166         op_metrics->om_bytes_sent += req->rq_xmit_bytes_sent;
 167         op_metrics->om_bytes_recv += req->rq_reply_bytes_recvd;
 168
 169         backlog = 0;
 170         if (ktime_to_ns(req->rq_xtime)) {
 171                 backlog = ktime_sub(req->rq_xtime, task->tk_start);
 172                 op_metrics->om_queue = ktime_add(op_metrics->om_queue, backlog);
 173         }
 174
 175         op_metrics->om_rtt = ktime_add(op_metrics->om_rtt, req->rq_rtt);
 176
 177         execute = ktime_sub(now, task->tk_start);
 178         op_metrics->om_execute = ktime_add(op_metrics->om_execute, execute);
 179         if (task->tk_status < 0)
 180                 op_metrics->om_error_status++;
 181
 182         spin_unlock(&op_metrics->om_lock);
 183
 184         trace_rpc_stats_latency(req->rq_task, backlog, req->rq_rtt, execute);
 185 }
 186 EXPORT_SYMBOL_GPL(rpc_count_iostats_metrics);
 187
 188 /**
 189  * rpc_count_iostats - tally up per-task stats
 190  * @task: completed rpc_task
 191  * @stats: array of stat structures
 192  *
 193  * Uses the statidx from @task
 194  */
 195 void rpc_count_iostats(const struct rpc_task *task, struct rpc_iostats *stats)
 196 {
 197         rpc_count_iostats_metrics(task,
 198                                   &stats[task->tk_msg.rpc_proc->p_statidx]);
 199 }
 200 EXPORT_SYMBOL_GPL(rpc_count_iostats);
 201
 202 static void _print_name(struct seq_file *seq, unsigned int op,
 203                         const struct rpc_procinfo *procs)
 204 {
 205         if (procs[op].p_name)
 206                 seq_printf(seq, "\t%12s: ", procs[op].p_name);
 207         else if (op == 0)
 208                 seq_printf(seq, "\t        NULL: ");
 209         else
 210                 seq_printf(seq, "\t%12u: ", op);
 211 }
 212
 213 static void _add_rpc_iostats(struct rpc_iostats *a, struct rpc_iostats *b)
 214 {
 215         a->om_ops += b->om_ops;
 216         a->om_ntrans += b->om_ntrans;
 217         a->om_timeouts += b->om_timeouts;
 218         a->om_bytes_sent += b->om_bytes_sent;
 219         a->om_bytes_recv += b->om_bytes_recv;
 220         a->om_queue = ktime_add(a->om_queue, b->om_queue);
 221         a->om_rtt = ktime_add(a->om_rtt, b->om_rtt);
 222         a->om_execute = ktime_add(a->om_execute, b->om_execute);
 223         a->om_error_status += b->om_error_status;
 224 }
 225
 226 static void _print_rpc_iostats(struct seq_file *seq, struct rpc_iostats *stats,
 227                                int op, const struct rpc_procinfo *procs)
 228 {
 229         _print_name(seq, op, procs);
 230         seq_printf(seq, "%lu %lu %lu %llu %llu %llu %llu %llu %lu\n",
 231                    stats->om_ops,
 232                    stats->om_ntrans,
 233                    stats->om_timeouts,
 234                    stats->om_bytes_sent,
 235                    stats->om_bytes_recv,
 236                    ktime_to_ms(stats->om_queue),
 237                    ktime_to_ms(stats->om_rtt),
 238                    ktime_to_ms(stats->om_execute),
 239                    stats->om_error_status);
 240 }
 241
 242 static int do_print_stats(struct rpc_clnt *clnt, struct rpc_xprt *xprt, void *seqv)
 243 {
 244         struct seq_file *seq = seqv;
 245
 246         xprt->ops->print_stats(xprt, seq);
 247         return 0;
 248 }
 249
 250 void rpc_clnt_show_stats(struct seq_file *seq, struct rpc_clnt *clnt)
 251 {
 252         unsigned int op, maxproc = clnt->cl_maxproc;
 253
 254         if (!clnt->cl_metrics)
 255                 return;
 256
 257         seq_printf(seq, "\tRPC iostats version: %s  ", RPC_IOSTATS_VERS);
 258         seq_printf(seq, "p/v: %u/%u (%s)\n",
 259                         clnt->cl_prog, clnt->cl_vers, clnt->cl_program->name);
 260
 261         rpc_clnt_iterate_for_each_xprt(clnt, do_print_stats, seq);
 262
 263         seq_printf(seq, "\tper-op statistics\n");
 264         for (op = 0; op < maxproc; op++) {
 265                 struct rpc_iostats stats = {};
 266                 struct rpc_clnt *next = clnt;
 267                 do {
 268                         _add_rpc_iostats(&stats, &next->cl_metrics[op]);
 269                         if (next == next->cl_parent)
 270                                 break;
 271                         next = next->cl_parent;
 272                 } while (next);
 273                 _print_rpc_iostats(seq, &stats, op, clnt->cl_procinfo);
 274         }
 275 }
 276 EXPORT_SYMBOL_GPL(rpc_clnt_show_stats);
 277
 278 /*
 279  * Register/unregister RPC proc files
 280  */
 281 static inline struct proc_dir_entry *
 282 do_register(struct net *net, const char *name, void *data,
 283             const struct proc_ops *proc_ops)
 284 {
 285         struct sunrpc_net *sn;
 286
 287         dprintk("RPC:       registering /proc/net/rpc/%s\n", name);
 288         sn = net_generic(net, sunrpc_net_id);
 289         return proc_create_data(name, 0, sn->proc_net_rpc, proc_ops, data);
 290 }
 291
 292 struct proc_dir_entry *
 293 rpc_proc_register(struct net *net, struct rpc_stat *statp)
 294 {
 295         return do_register(net, statp->program->name, statp, &rpc_proc_ops);
 296 }
 297 EXPORT_SYMBOL_GPL(rpc_proc_register);
 298
 299 void
 300 rpc_proc_unregister(struct net *net, const char *name)
 301 {
 302         struct sunrpc_net *sn;
 303
 304         sn = net_generic(net, sunrpc_net_id);
 305         remove_proc_entry(name, sn->proc_net_rpc);
 306 }
 307 EXPORT_SYMBOL_GPL(rpc_proc_unregister);
 308
 309 struct proc_dir_entry *
 310 svc_proc_register(struct net *net, struct svc_stat *statp, const struct proc_ops *proc_ops)
 311 {
 312         return do_register(net, statp->program->pg_name, statp, proc_ops);
 313 }
 314 EXPORT_SYMBOL_GPL(svc_proc_register);
 315
 316 void
 317 svc_proc_unregister(struct net *net, const char *name)
 318 {
 319         struct sunrpc_net *sn;
 320
 321         sn = net_generic(net, sunrpc_net_id);
 322         remove_proc_entry(name, sn->proc_net_rpc);
 323 }
 324 EXPORT_SYMBOL_GPL(svc_proc_unregister);
 325
 326 int rpc_proc_init(struct net *net)
 327 {
 328         struct sunrpc_net *sn;
 329
 330         dprintk("RPC:       registering /proc/net/rpc\n");
 331         sn = net_generic(net, sunrpc_net_id);
 332         sn->proc_net_rpc = proc_mkdir("rpc", net->proc_net);
 333         if (sn->proc_net_rpc == NULL)
 334                 return -ENOMEM;
 335
 336         return 0;
 337 }
 338
 339 void rpc_proc_exit(struct net *net)
 340 {
 341         dprintk("RPC:       unregistering /proc/net/rpc\n");
 342         remove_proc_entry("rpc", net->proc_net);
 343 }