target/linux/generic/backport-5.15/602-v5.18-page_pool-Add-function-to-batch-and-return-stats.patch

   1 From 6b95e3388b1ea0ca63500c5a6e39162dbf828433 Mon Sep 17 00:00:00 2001
   2 From: Joe Damato <jdamato@fastly.com>
   3 Date: Tue, 1 Mar 2022 23:55:49 -0800
   4 Subject: [PATCH 3/3] page_pool: Add function to batch and return stats
   5
   6 Adds a function page_pool_get_stats which can be used by drivers to obtain
   7 stats for a specified page_pool.
   8
   9 Signed-off-by: Joe Damato <jdamato@fastly.com>
  10 Acked-by: Jesper Dangaard Brouer <brouer@redhat.com>
  11 Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
  12 Signed-off-by: David S. Miller <davem@davemloft.net>
  13 ---
  14  include/net/page_pool.h | 17 +++++++++++++++++
  15  net/core/page_pool.c    | 25 +++++++++++++++++++++++++
  16  2 files changed, 42 insertions(+)
  17
  18 --- a/include/net/page_pool.h
  19 +++ b/include/net/page_pool.h
  20 @@ -105,6 +105,23 @@ struct page_pool_recycle_stats {
  21                               * refcnt
  22                               */
  23  };
  24 +
  25 +/* This struct wraps the above stats structs so users of the
  26 + * page_pool_get_stats API can pass a single argument when requesting the
  27 + * stats for the page pool.
  28 + */
  29 +struct page_pool_stats {
  30 +       struct page_pool_alloc_stats alloc_stats;
  31 +       struct page_pool_recycle_stats recycle_stats;
  32 +};
  33 +
  34 +/*
  35 + * Drivers that wish to harvest page pool stats and report them to users
  36 + * (perhaps via ethtool, debugfs, or another mechanism) can allocate a
  37 + * struct page_pool_stats call page_pool_get_stats to get stats for the specified pool.
  38 + */
  39 +bool page_pool_get_stats(struct page_pool *pool,
  40 +                        struct page_pool_stats *stats);
  41  #endif
  42
  43  struct page_pool {
  44 --- a/net/core/page_pool.c
  45 +++ b/net/core/page_pool.c
  46 @@ -35,6 +35,31 @@
  47                 struct page_pool_recycle_stats __percpu *s = pool->recycle_stats;       \
  48                 this_cpu_inc(s->__stat);                                                \
  49         } while (0)
  50 +
  51 +bool page_pool_get_stats(struct page_pool *pool,
  52 +                        struct page_pool_stats *stats)
  53 +{
  54 +       int cpu = 0;
  55 +
  56 +       if (!stats)
  57 +               return false;
  58 +
  59 +       memcpy(&stats->alloc_stats, &pool->alloc_stats, sizeof(pool->alloc_stats));
  60 +
  61 +       for_each_possible_cpu(cpu) {
  62 +               const struct page_pool_recycle_stats *pcpu =
  63 +                       per_cpu_ptr(pool->recycle_stats, cpu);
  64 +
  65 +               stats->recycle_stats.cached += pcpu->cached;
  66 +               stats->recycle_stats.cache_full += pcpu->cache_full;
  67 +               stats->recycle_stats.ring += pcpu->ring;
  68 +               stats->recycle_stats.ring_full += pcpu->ring_full;
  69 +               stats->recycle_stats.released_refcnt += pcpu->released_refcnt;
  70 +       }
  71 +
  72 +       return true;
  73 +}
  74 +EXPORT_SYMBOL(page_pool_get_stats);
  75  #else
  76  #define alloc_stat_inc(pool, __stat)
  77  #define recycle_stat_inc(pool, __stat)