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, k;
  87         unsigned long count;
  88
  89         seq_printf(seq,
  90                 "net %u %u %u %u\n",
  91                         statp->netcnt,
  92                         statp->netudpcnt,
  93                         statp->nettcpcnt,
  94                         statp->nettcpconn);
  95         seq_printf(seq,
  96                 "rpc %u %u %u %u %u\n",
  97                         statp->rpccnt,
  98                         statp->rpcbadfmt+statp->rpcbadauth+statp->rpcbadclnt,
  99                         statp->rpcbadfmt,
 100                         statp->rpcbadauth,
 101                         statp->rpcbadclnt);
 102
 103         for (i = 0; i < prog->pg_nvers; i++) {
 104                 vers = prog->pg_vers[i];
 105                 if (!vers)
 106                         continue;
 107                 seq_printf(seq, "proc%d %u", i, vers->vs_nproc);
 108                 for (j = 0; j < vers->vs_nproc; j++) {
 109                         count = 0;
 110                         for_each_possible_cpu(k)
 111                                 count += per_cpu(vers->vs_count[j], k);
 112                         seq_printf(seq, " %lu", count);
 113                 }
 114                 seq_putc(seq, '\n');
 115         }
 116 }
 117 EXPORT_SYMBOL_GPL(svc_seq_show);
 118
 119 /**
 120  * rpc_alloc_iostats - allocate an rpc_iostats structure
 121  * @clnt: RPC program, version, and xprt
 122  *
 123  */
 124 struct rpc_iostats *rpc_alloc_iostats(struct rpc_clnt *clnt)
 125 {
 126         struct rpc_iostats *stats;
 127         int i;
 128
 129         stats = kcalloc(clnt->cl_maxproc, sizeof(*stats), GFP_KERNEL);
 130         if (stats) {
 131                 for (i = 0; i < clnt->cl_maxproc; i++)
 132                         spin_lock_init(&stats[i].om_lock);
 133         }
 134         return stats;
 135 }
 136 EXPORT_SYMBOL_GPL(rpc_alloc_iostats);
 137
 138 /**
 139  * rpc_free_iostats - release an rpc_iostats structure
 140  * @stats: doomed rpc_iostats structure
 141  *
 142  */
 143 void rpc_free_iostats(struct rpc_iostats *stats)
 144 {
 145         kfree(stats);
 146 }
 147 EXPORT_SYMBOL_GPL(rpc_free_iostats);
 148
 149 /**
 150  * rpc_count_iostats_metrics - tally up per-task stats
 151  * @task: completed rpc_task
 152  * @op_metrics: stat structure for OP that will accumulate stats from @task
 153  */
 154 void rpc_count_iostats_metrics(const struct rpc_task *task,
 155                                struct rpc_iostats *op_metrics)
 156 {
 157         struct rpc_rqst *req = task->tk_rqstp;
 158         ktime_t backlog, execute, now;
 159
 160         if (!op_metrics || !req)
 161                 return;
 162
 163         now = ktime_get();
 164         spin_lock(&op_metrics->om_lock);
 165
 166         op_metrics->om_ops++;
 167         /* kernel API: om_ops must never become larger than om_ntrans */
 168         op_metrics->om_ntrans += max(req->rq_ntrans, 1);
 169         op_metrics->om_timeouts += task->tk_timeouts;
 170
 171         op_metrics->om_bytes_sent += req->rq_xmit_bytes_sent;
 172         op_metrics->om_bytes_recv += req->rq_reply_bytes_recvd;
 173
 174         backlog = 0;
 175         if (ktime_to_ns(req->rq_xtime)) {
 176                 backlog = ktime_sub(req->rq_xtime, task->tk_start);
 177                 op_metrics->om_queue = ktime_add(op_metrics->om_queue, backlog);
 178         }
 179
 180         op_metrics->om_rtt = ktime_add(op_metrics->om_rtt, req->rq_rtt);
 181
 182         execute = ktime_sub(now, task->tk_start);
 183         op_metrics->om_execute = ktime_add(op_metrics->om_execute, execute);
 184         if (task->tk_status < 0)
 185                 op_metrics->om_error_status++;
 186
 187         spin_unlock(&op_metrics->om_lock);
 188
 189         trace_rpc_stats_latency(req->rq_task, backlog, req->rq_rtt, execute);
 190 }
 191 EXPORT_SYMBOL_GPL(rpc_count_iostats_metrics);
 192
 193 /**
 194  * rpc_count_iostats - tally up per-task stats
 195  * @task: completed rpc_task
 196  * @stats: array of stat structures
 197  *
 198  * Uses the statidx from @task
 199  */
 200 void rpc_count_iostats(const struct rpc_task *task, struct rpc_iostats *stats)
 201 {
 202         rpc_count_iostats_metrics(task,
 203                                   &stats[task->tk_msg.rpc_proc->p_statidx]);
 204 }
 205 EXPORT_SYMBOL_GPL(rpc_count_iostats);
 206
 207 static void _print_name(struct seq_file *seq, unsigned int op,
 208                         const struct rpc_procinfo *procs)
 209 {
 210         if (procs[op].p_name)
 211                 seq_printf(seq, "\t%12s: ", procs[op].p_name);
 212         else if (op == 0)
 213                 seq_printf(seq, "\t        NULL: ");
 214         else
 215                 seq_printf(seq, "\t%12u: ", op);
 216 }
 217
 218 static void _add_rpc_iostats(struct rpc_iostats *a, struct rpc_iostats *b)
 219 {
 220         a->om_ops += b->om_ops;
 221         a->om_ntrans += b->om_ntrans;
 222         a->om_timeouts += b->om_timeouts;
 223         a->om_bytes_sent += b->om_bytes_sent;
 224         a->om_bytes_recv += b->om_bytes_recv;
 225         a->om_queue = ktime_add(a->om_queue, b->om_queue);
 226         a->om_rtt = ktime_add(a->om_rtt, b->om_rtt);
 227         a->om_execute = ktime_add(a->om_execute, b->om_execute);
 228         a->om_error_status += b->om_error_status;
 229 }
 230
 231 static void _print_rpc_iostats(struct seq_file *seq, struct rpc_iostats *stats,
 232                                int op, const struct rpc_procinfo *procs)
 233 {
 234         _print_name(seq, op, procs);
 235         seq_printf(seq, "%lu %lu %lu %llu %llu %llu %llu %llu %lu\n",
 236                    stats->om_ops,
 237                    stats->om_ntrans,
 238                    stats->om_timeouts,
 239                    stats->om_bytes_sent,
 240                    stats->om_bytes_recv,
 241                    ktime_to_ms(stats->om_queue),
 242                    ktime_to_ms(stats->om_rtt),
 243                    ktime_to_ms(stats->om_execute),
 244                    stats->om_error_status);
 245 }
 246
 247 static int do_print_stats(struct rpc_clnt *clnt, struct rpc_xprt *xprt, void *seqv)
 248 {
 249         struct seq_file *seq = seqv;
 250
 251         xprt->ops->print_stats(xprt, seq);
 252         return 0;
 253 }
 254
 255 void rpc_clnt_show_stats(struct seq_file *seq, struct rpc_clnt *clnt)
 256 {
 257         unsigned int op, maxproc = clnt->cl_maxproc;
 258
 259         if (!clnt->cl_metrics)
 260                 return;
 261
 262         seq_printf(seq, "\tRPC iostats version: %s  ", RPC_IOSTATS_VERS);
 263         seq_printf(seq, "p/v: %u/%u (%s)\n",
 264                         clnt->cl_prog, clnt->cl_vers, clnt->cl_program->name);
 265
 266         rpc_clnt_iterate_for_each_xprt(clnt, do_print_stats, seq);
 267
 268         seq_printf(seq, "\tper-op statistics\n");
 269         for (op = 0; op < maxproc; op++) {
 270                 struct rpc_iostats stats = {};
 271                 struct rpc_clnt *next = clnt;
 272                 do {
 273                         _add_rpc_iostats(&stats, &next->cl_metrics[op]);
 274                         if (next == next->cl_parent)
 275                                 break;
 276                         next = next->cl_parent;
 277                 } while (next);
 278                 _print_rpc_iostats(seq, &stats, op, clnt->cl_procinfo);
 279         }
 280 }
 281 EXPORT_SYMBOL_GPL(rpc_clnt_show_stats);
 282
 283 /*
 284  * Register/unregister RPC proc files
 285  */
 286 static inline struct proc_dir_entry *
 287 do_register(struct net *net, const char *name, void *data,
 288             const struct proc_ops *proc_ops)
 289 {
 290         struct sunrpc_net *sn;
 291
 292         dprintk("RPC:       registering /proc/net/rpc/%s\n", name);
 293         sn = net_generic(net, sunrpc_net_id);
 294         return proc_create_data(name, 0, sn->proc_net_rpc, proc_ops, data);
 295 }
 296
 297 struct proc_dir_entry *
 298 rpc_proc_register(struct net *net, struct rpc_stat *statp)
 299 {
 300         return do_register(net, statp->program->name, statp, &rpc_proc_ops);
 301 }
 302 EXPORT_SYMBOL_GPL(rpc_proc_register);
 303
 304 void
 305 rpc_proc_unregister(struct net *net, const char *name)
 306 {
 307         struct sunrpc_net *sn;
 308
 309         sn = net_generic(net, sunrpc_net_id);
 310         remove_proc_entry(name, sn->proc_net_rpc);
 311 }
 312 EXPORT_SYMBOL_GPL(rpc_proc_unregister);
 313
 314 struct proc_dir_entry *
 315 svc_proc_register(struct net *net, struct svc_stat *statp, const struct proc_ops *proc_ops)
 316 {
 317         return do_register(net, statp->program->pg_name, net, proc_ops);
 318 }
 319 EXPORT_SYMBOL_GPL(svc_proc_register);
 320
 321 void
 322 svc_proc_unregister(struct net *net, const char *name)
 323 {
 324         struct sunrpc_net *sn;
 325
 326         sn = net_generic(net, sunrpc_net_id);
 327         remove_proc_entry(name, sn->proc_net_rpc);
 328 }
 329 EXPORT_SYMBOL_GPL(svc_proc_unregister);
 330
 331 int rpc_proc_init(struct net *net)
 332 {
 333         struct sunrpc_net *sn;
 334
 335         dprintk("RPC:       registering /proc/net/rpc\n");
 336         sn = net_generic(net, sunrpc_net_id);
 337         sn->proc_net_rpc = proc_mkdir("rpc", net->proc_net);
 338         if (sn->proc_net_rpc == NULL)
 339                 return -ENOMEM;
 340
 341         return 0;
 342 }
 343
 344 void rpc_proc_exit(struct net *net)
 345 {
 346         dprintk("RPC:       unregistering /proc/net/rpc\n");
 347         remove_proc_entry("rpc", net->proc_net);
 348 }