tools/net/ynl/samples/page-pool.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #define _GNU_SOURCE
   3
   4 #include <stdio.h>
   5 #include <string.h>
   6
   7 #include <ynl.h>
   8
   9 #include <net/if.h>
  10
  11 #include "netdev-user.h"
  12
  13 struct stat {
  14         unsigned int ifc;
  15
  16         struct {
  17                 unsigned int cnt;
  18                 size_t refs, bytes;
  19         } live[2];
  20
  21         size_t alloc_slow, alloc_fast, recycle_ring, recycle_cache;
  22 };
  23
  24 struct stats_array {
  25         unsigned int i, max;
  26         struct stat *s;
  27 };
  28
  29 static struct stat *find_ifc(struct stats_array *a, unsigned int ifindex)
  30 {
  31         unsigned int i;
  32
  33         for (i = 0; i < a->i; i++) {
  34                 if (a->s[i].ifc == ifindex)
  35                         return &a->s[i];
  36         }
  37
  38         a->i++;
  39         if (a->i == a->max) {
  40                 a->max *= 2;
  41                 a->s = reallocarray(a->s, a->max, sizeof(*a->s));
  42         }
  43         a->s[i].ifc = ifindex;
  44         return &a->s[i];
  45 }
  46
  47 static void count(struct stat *s, unsigned int l,
  48                   struct netdev_page_pool_get_rsp *pp)
  49 {
  50         s->live[l].cnt++;
  51         if (pp->_present.inflight)
  52                 s->live[l].refs += pp->inflight;
  53         if (pp->_present.inflight_mem)
  54                 s->live[l].bytes += pp->inflight_mem;
  55 }
  56
  57 int main(int argc, char **argv)
  58 {
  59         struct netdev_page_pool_stats_get_list *pp_stats;
  60         struct netdev_page_pool_get_list *pools;
  61         struct stats_array a = {};
  62         struct ynl_error yerr;
  63         struct ynl_sock *ys;
  64
  65         ys = ynl_sock_create(&ynl_netdev_family, &yerr);
  66         if (!ys) {
  67                 fprintf(stderr, "YNL: %s\n", yerr.msg);
  68                 return 1;
  69         }
  70
  71         a.max = 128;
  72         a.s = calloc(a.max, sizeof(*a.s));
  73         if (!a.s)
  74                 goto err_close;
  75
  76         pools = netdev_page_pool_get_dump(ys);
  77         if (!pools)
  78                 goto err_free;
  79
  80         ynl_dump_foreach(pools, pp) {
  81                 struct stat *s = find_ifc(&a, pp->ifindex);
  82
  83                 count(s, 1, pp);
  84                 if (pp->_present.detach_time)
  85                         count(s, 0, pp);
  86         }
  87         netdev_page_pool_get_list_free(pools);
  88
  89         pp_stats = netdev_page_pool_stats_get_dump(ys);
  90         if (!pp_stats)
  91                 goto err_free;
  92
  93         ynl_dump_foreach(pp_stats, pp) {
  94                 struct stat *s = find_ifc(&a, pp->info.ifindex);
  95
  96                 if (pp->_present.alloc_fast)
  97                         s->alloc_fast += pp->alloc_fast;
  98                 if (pp->_present.alloc_refill)
  99                         s->alloc_fast += pp->alloc_refill;
 100                 if (pp->_present.alloc_slow)
 101                         s->alloc_slow += pp->alloc_slow;
 102                 if (pp->_present.recycle_ring)
 103                         s->recycle_ring += pp->recycle_ring;
 104                 if (pp->_present.recycle_cached)
 105                         s->recycle_cache += pp->recycle_cached;
 106         }
 107         netdev_page_pool_stats_get_list_free(pp_stats);
 108
 109         for (unsigned int i = 0; i < a.i; i++) {
 110                 char ifname[IF_NAMESIZE];
 111                 struct stat *s = &a.s[i];
 112                 const char *name;
 113                 double recycle;
 114
 115                 if (!s->ifc) {
 116                         name = "<orphan>\t";
 117                 } else {
 118                         name = if_indextoname(s->ifc, ifname);
 119                         if (name)
 120                                 printf("%8s", name);
 121                         printf("[%u]\t", s->ifc);
 122                 }
 123
 124                 printf("page pools: %u (zombies: %u)\n",
 125                        s->live[1].cnt, s->live[0].cnt);
 126                 printf("\t\trefs: %zu bytes: %zu (refs: %zu bytes: %zu)\n",
 127                        s->live[1].refs, s->live[1].bytes,
 128                        s->live[0].refs, s->live[0].bytes);
 129
 130                 /* We don't know how many pages are sitting in cache and ring
 131                  * so we will under-count the recycling rate a bit.
 132                  */
 133                 recycle = (double)(s->recycle_ring + s->recycle_cache) /
 134                         (s->alloc_fast + s->alloc_slow) * 100;
 135                 printf("\t\trecycling: %.1lf%% (alloc: %zu:%zu recycle: %zu:%zu)\n",
 136                        recycle, s->alloc_slow, s->alloc_fast,
 137                        s->recycle_ring, s->recycle_cache);
 138         }
 139
 140         ynl_sock_destroy(ys);
 141         return 0;
 142
 143 err_free:
 144         free(a.s);
 145 err_close:
 146         fprintf(stderr, "YNL: %s\n", ys->err.msg);
 147         ynl_sock_destroy(ys);
 148         return 2;
 149 }