Merge branch 'page_pool-stats'

Joe Damato says:

====================
page_pool: Add stats counters

Greetings:

Welcome to v9.

This revisions adds a commit which updates the page_pool documentation to
describe the stats API, structures, and fields.

Additionally, this revision contains a minor cosmetic change suggested by
Saeed in page_pool_recycle_in_ring in commit 2: "page_pool: Add recycle
stats", which removes an unnecessary #ifdef.

There are no functional changes in this revision.

Benchmark output from the v7 cover [1] is pasted below, as it is still
relevant since no functional changes have been made in this revision:

Benchmarks have been re-run. As always, results between runs are highly
variable; you'll find results showing that stats disabled are both faster
and slower than stats enabled in back to back benchmark runs.

Raw benchmark output with stats off [2] and stats on [3] are available for
examination.

Test system:
	- 2x Intel(R) Xeon(R) Gold 6140 CPU @ 2.30GHz
	- 2 NUMA zones, with 18 cores per zone and 2 threads per core

bench_page_pool_simple results, loops=200000000
test name			stats enabled		stats disabled
				cycles	nanosec		cycles	nanosec

for_loop			0	0.335		0	0.336
atomic_inc 			14	6.106		13	6.022
lock				30	13.365		32	13.968

no-softirq-page_pool01		75	32.884		74	32.308
no-softirq-page_pool02		79	34.696		74	32.302
no-softirq-page_pool03		110	48.005		105	46.073

tasklet_page_pool01_fast_path	14	6.156		14	6.211
tasklet_page_pool02_ptr_ring	41	18.028		39	17.391
tasklet_page_pool03_slow	107	46.646		105	46.123

bench_page_pool_cross_cpu results, loops=20000000 returning_cpus=4:
test name			stats enabled		stats disabled
				cycles	nanosec		cycles	nanosec

page_pool_cross_cpu CPU(0)	3973	1731.596	4015	1750.015
page_pool_cross_cpu CPU(1)	3976	1733.217	4022	1752.864
page_pool_cross_cpu CPU(2)	3973	1731.615	4016	1750.433
page_pool_cross_cpu CPU(3)	3976	1733.218	4021	1752.806
page_pool_cross_cpu CPU(4)	994	433.305		1005	438.217

page_pool_cross_cpu average	3378	-		3415	-

bench_page_pool_cross_cpu results, loops=20000000 returning_cpus=8:
test name			stats enabled		stats disabled
				cycles	nanosec		cycles	nanosec

page_pool_cross_cpu CPU(0)	6969	3037.488	6909	3011.463
page_pool_cross_cpu CPU(1)	6974	3039.469	6913	3012.961
page_pool_cross_cpu CPU(2)	6969	3037.575	6910	3011.585
page_pool_cross_cpu CPU(3)	6974	3039.415	6913	3012.961
page_pool_cross_cpu CPU(4)	6969	3037.288	6909	3011.368
page_pool_cross_cpu CPU(5)	6972	3038.732	6913	3012.920
page_pool_cross_cpu CPU(6)	6969	3037.350	6909	3011.386
page_pool_cross_cpu CPU(7)	6973	3039.356	6913	3012.921
page_pool_cross_cpu CPU(8)	871	379.934		864	376.620

page_pool_cross_cpu average	6293	-		6239	-

Thanks.

[1]: https://lore.kernel.org/all/1645810914-35485-1-git-send-email-jdamato@fastly.com/
[2]: https://gist.githubusercontent.com/jdamato-fsly/d7c34b9fa7be1ce132a266b0f2b92aea/raw/327dcd71d11ece10238fbf19e0472afbcbf22fd4/v7_stats_disabled
[3]: https://gist.githubusercontent.com/jdamato-fsly/d7c34b9fa7be1ce132a266b0f2b92aea/raw/327dcd71d11ece10238fbf19e0472afbcbf22fd4/v7_stats_enabled

v8 -> v9:
	- Add documentation about the page_pool_get_stats API, stats
	  structures, and fields to Documentation/networking/page_pool.rst.
	- Remove unnecessary #ifdef in page_pool_recycle_in_ring.

v7 -> v8:
	- Rename mlx5 ethtool stats so that users have a better idea of
	  their meaning.

v6 -> v7:
	- stats split out into two structs one single per-page pool struct
	  for allocation path stats and one per-cpu pointer for recycle
	  path stats.
	- page_pool_get_stats updated to use a wrapper struct to gather
	  stats for allocation and recycle stats with a single argument.
	- placement of structs adjusted
	- mlx5 driver modified to use page_pool_get_stats API

v5 -> v6:
	- Per cpu page_pool_stats struct pointer is now marked as
	  ____cacheline_aligned_in_smp. Placement of the field in the
	  struct is unchanged; it is the last field.

v4 -> v5:
	- Fixed the description of the kernel option in Kconfig.
	- Squashed commits 1-10 from v4 into a single commit for easier
	  review.
	- Changed the comment style of the comment for
	  the this_cpu_inc_alloc_stat macro.
	- Changed the return type of page_pool_get_stats from struct
	  page_pool_stat * to bool.

v3 -> v4:
	- Restructured stats to be per-cpu per-pool.
	- Global stats and proc file were removed.
	- Exposed an API (page_pool_get_stats) for batching the pool stats.

v2 -> v3:
	- patch 8/10 ("Add stat tracking cache refill") fixed placement of
	  counter increment.
	- patch 10/10 ("net-procfs: Show page pool stats in proc") updated:
		- fix unused label warning from kernel test robot,
		- fixed page_pool_seq_show to only display the refill stat
		  once,
		- added a remove_proc_entry for page_pool_stat to
		  dev_proc_net_exit.

v1 -> v2:
	- A new kernel config option has been added, which defaults to N,
	   preventing this code from being compiled in by default
	- The stats structure has been converted to a per-cpu structure
	- The stats are now exported via proc (/proc/net/page_pool_stat)
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

6 files changed, 294 insertions, 7 deletions

diff --git a/Documentation/networking/page_pool.rst b/Documentation/networking/page_pool.rst
index a147591ce203..5db8c263b0c6 100644
--- a/Documentation/networking/page_pool.rst
+++ b/Documentation/networking/page_pool.rst
@@ -105,6 +105,47 @@ a page will cause no race conditions is enough.
   Please note the caller must not use data area after running
   page_pool_put_page_bulk(), as this function overwrites it.
 
+* page_pool_get_stats(): Retrieve statistics about the page_pool. This API
+  is only available if the kernel has been configured with
+  ``CONFIG_PAGE_POOL_STATS=y``. A pointer to a caller allocated ``struct
+  page_pool_stats`` structure is passed to this API which is filled in. The
+  caller can then report those stats to the user (perhaps via ethtool,
+  debugfs, etc.). See below for an example usage of this API.
+
+Stats API and structures
+------------------------
+If the kernel is configured with ``CONFIG_PAGE_POOL_STATS=y``, the API
+``page_pool_get_stats()`` and structures described below are available. It
+takes a  pointer to a ``struct page_pool`` and a pointer to a ``struct
+page_pool_stats`` allocated by the caller.
+
+The API will fill in the provided ``struct page_pool_stats`` with
+statistics about the page_pool.
+
+The stats structure has the following fields::
+
+    struct page_pool_stats {
+        struct page_pool_alloc_stats alloc_stats;
+        struct page_pool_recycle_stats recycle_stats;
+    };
+
+
+The ``struct page_pool_alloc_stats`` has the following fields:
+  * ``fast``: successful fast path allocations
+  * ``slow``: slow path order-0 allocations
+  * ``slow_high_order``: slow path high order allocations
+  * ``empty``: ptr ring is empty, so a slow path allocation was forced.
+  * ``refill``: an allocation which triggered a refill of the cache
+  * ``waive``: pages obtained from the ptr ring that cannot be added to
+    the cache due to a NUMA mismatch.
+
+The ``struct page_pool_recycle_stats`` has the following fields:
+  * ``cached``: recycling placed page in the page pool cache
+  * ``cache_full``: page pool cache was full
+  * ``ring``: page placed into the ptr ring
+  * ``ring_full``: page released from page pool because the ptr ring was full
+  * ``released_refcnt``: page released (and not recycled) because refcnt > 1
+
 Coding examples
 ===============
 
@@ -157,6 +198,21 @@ NAPI poller
         }
     }
 
+Stats
+-----
+
+.. code-block:: c
+
+	#ifdef CONFIG_PAGE_POOL_STATS
+	/* retrieve stats */
+	struct page_pool_stats stats = { 0 };
+	if (page_pool_get_stats(page_pool, &stats)) {
+		/* perhaps the driver reports statistics with ethool */
+		ethtool_print_allocation_stats(&stats.alloc_stats);
+		ethtool_print_recycle_stats(&stats.recycle_stats);
+	}
+	#endif
+
 Driver unload
 -------------
 
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_stats.c b/drivers/net/ethernet/mellanox/mlx5/core/en_stats.c
index 2afecc486f9a..336e4d04c5f2 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_stats.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_stats.c
@@ -37,6 +37,10 @@
 #include "en/ptp.h"
 #include "en/port.h"
 
+#ifdef CONFIG_PAGE_POOL_STATS
+#include <net/page_pool.h>
+#endif
+
 static unsigned int stats_grps_num(struct mlx5e_priv *priv)
 {
 	return !priv->profile->stats_grps_num ? 0 :
@@ -183,6 +187,19 @@ static const struct counter_desc sw_stats_desc[] = {
 	{ MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, rx_congst_umr) },
 	{ MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, rx_arfs_err) },
 	{ MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, rx_recover) },
+#ifdef CONFIG_PAGE_POOL_STATS
+	{ MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, rx_pp_alloc_fast) },
+	{ MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, rx_pp_alloc_slow) },
+	{ MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, rx_pp_alloc_slow_high_order) },
+	{ MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, rx_pp_alloc_empty) },
+	{ MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, rx_pp_alloc_refill) },
+	{ MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, rx_pp_alloc_waive) },
+	{ MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, rx_pp_recycle_cached) },
+	{ MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, rx_pp_recycle_cache_full) },
+	{ MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, rx_pp_recycle_ring) },
+	{ MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, rx_pp_recycle_ring_full) },
+	{ MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, rx_pp_recycle_released_ref) },
+#endif
 #ifdef CONFIG_MLX5_EN_TLS
 	{ MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, rx_tls_decrypted_packets) },
 	{ MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, rx_tls_decrypted_bytes) },
@@ -349,6 +366,19 @@ static void mlx5e_stats_grp_sw_update_stats_rq_stats(struct mlx5e_sw_stats *s,
 	s->rx_congst_umr              += rq_stats->congst_umr;
 	s->rx_arfs_err                += rq_stats->arfs_err;
 	s->rx_recover                 += rq_stats->recover;
+#ifdef CONFIG_PAGE_POOL_STATS
+	s->rx_pp_alloc_fast          += rq_stats->pp_alloc_fast;
+	s->rx_pp_alloc_slow          += rq_stats->pp_alloc_slow;
+	s->rx_pp_alloc_empty         += rq_stats->pp_alloc_empty;
+	s->rx_pp_alloc_refill        += rq_stats->pp_alloc_refill;
+	s->rx_pp_alloc_waive         += rq_stats->pp_alloc_waive;
+	s->rx_pp_alloc_slow_high_order		+= rq_stats->pp_alloc_slow_high_order;
+	s->rx_pp_recycle_cached			+= rq_stats->pp_recycle_cached;
+	s->rx_pp_recycle_cache_full		+= rq_stats->pp_recycle_cache_full;
+	s->rx_pp_recycle_ring			+= rq_stats->pp_recycle_ring;
+	s->rx_pp_recycle_ring_full		+= rq_stats->pp_recycle_ring_full;
+	s->rx_pp_recycle_released_ref		+= rq_stats->pp_recycle_released_ref;
+#endif
 #ifdef CONFIG_MLX5_EN_TLS
 	s->rx_tls_decrypted_packets   += rq_stats->tls_decrypted_packets;
 	s->rx_tls_decrypted_bytes     += rq_stats->tls_decrypted_bytes;
@@ -455,6 +485,35 @@ static void mlx5e_stats_grp_sw_update_stats_qos(struct mlx5e_priv *priv,
 	}
 }
 
+#ifdef CONFIG_PAGE_POOL_STATS
+static void mlx5e_stats_update_stats_rq_page_pool(struct mlx5e_channel *c)
+{
+	struct mlx5e_rq_stats *rq_stats = c->rq.stats;
+	struct page_pool *pool = c->rq.page_pool;
+	struct page_pool_stats stats = { 0 };
+
+	if (!page_pool_get_stats(pool, &stats))
+		return;
+
+	rq_stats->pp_alloc_fast = stats.alloc_stats.fast;
+	rq_stats->pp_alloc_slow = stats.alloc_stats.slow;
+	rq_stats->pp_alloc_slow_high_order = stats.alloc_stats.slow_high_order;
+	rq_stats->pp_alloc_empty = stats.alloc_stats.empty;
+	rq_stats->pp_alloc_waive = stats.alloc_stats.waive;
+	rq_stats->pp_alloc_refill = stats.alloc_stats.refill;
+
+	rq_stats->pp_recycle_cached = stats.recycle_stats.cached;
+	rq_stats->pp_recycle_cache_full = stats.recycle_stats.cache_full;
+	rq_stats->pp_recycle_ring = stats.recycle_stats.ring;
+	rq_stats->pp_recycle_ring_full = stats.recycle_stats.ring_full;
+	rq_stats->pp_recycle_released_ref = stats.recycle_stats.released_refcnt;
+}
+#else
+static void mlx5e_stats_update_stats_rq_page_pool(struct mlx5e_channel *c)
+{
+}
+#endif
+
 static MLX5E_DECLARE_STATS_GRP_OP_UPDATE_STATS(sw)
 {
 	struct mlx5e_sw_stats *s = &priv->stats.sw;
@@ -465,8 +524,11 @@ static MLX5E_DECLARE_STATS_GRP_OP_UPDATE_STATS(sw)
 	for (i = 0; i < priv->stats_nch; i++) {
 		struct mlx5e_channel_stats *channel_stats =
 			priv->channel_stats[i];
+
 		int j;
 
+		mlx5e_stats_update_stats_rq_page_pool(priv->channels.c[i]);
+
 		mlx5e_stats_grp_sw_update_stats_rq_stats(s, &channel_stats->rq);
 		mlx5e_stats_grp_sw_update_stats_xdpsq(s, &channel_stats->rq_xdpsq);
 		mlx5e_stats_grp_sw_update_stats_ch_stats(s, &channel_stats->ch);
@@ -1887,6 +1949,19 @@ static const struct counter_desc rq_stats_desc[] = {
 	{ MLX5E_DECLARE_RX_STAT(struct mlx5e_rq_stats, congst_umr) },
 	{ MLX5E_DECLARE_RX_STAT(struct mlx5e_rq_stats, arfs_err) },
 	{ MLX5E_DECLARE_RX_STAT(struct mlx5e_rq_stats, recover) },
+#ifdef CONFIG_PAGE_POOL_STATS
+	{ MLX5E_DECLARE_RX_STAT(struct mlx5e_rq_stats, pp_alloc_fast) },
+	{ MLX5E_DECLARE_RX_STAT(struct mlx5e_rq_stats, pp_alloc_slow) },
+	{ MLX5E_DECLARE_RX_STAT(struct mlx5e_rq_stats, pp_alloc_slow_high_order) },
+	{ MLX5E_DECLARE_RX_STAT(struct mlx5e_rq_stats, pp_alloc_empty) },
+	{ MLX5E_DECLARE_RX_STAT(struct mlx5e_rq_stats, pp_alloc_refill) },
+	{ MLX5E_DECLARE_RX_STAT(struct mlx5e_rq_stats, pp_alloc_waive) },
+	{ MLX5E_DECLARE_RX_STAT(struct mlx5e_rq_stats, pp_recycle_cached) },
+	{ MLX5E_DECLARE_RX_STAT(struct mlx5e_rq_stats, pp_recycle_cache_full) },
+	{ MLX5E_DECLARE_RX_STAT(struct mlx5e_rq_stats, pp_recycle_ring) },
+	{ MLX5E_DECLARE_RX_STAT(struct mlx5e_rq_stats, pp_recycle_ring_full) },
+	{ MLX5E_DECLARE_RX_STAT(struct mlx5e_rq_stats, pp_recycle_released_ref) },
+#endif
 #ifdef CONFIG_MLX5_EN_TLS
 	{ MLX5E_DECLARE_RX_STAT(struct mlx5e_rq_stats, tls_decrypted_packets) },
 	{ MLX5E_DECLARE_RX_STAT(struct mlx5e_rq_stats, tls_decrypted_bytes) },
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_stats.h b/drivers/net/ethernet/mellanox/mlx5/core/en_stats.h
index 14eaf923e7b3..a7a025d15c14 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_stats.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_stats.h
@@ -205,7 +205,19 @@ struct mlx5e_sw_stats {
 	u64 ch_aff_change;
 	u64 ch_force_irq;
 	u64 ch_eq_rearm;
-
+#ifdef CONFIG_PAGE_POOL_STATS
+	u64 rx_pp_alloc_fast;
+	u64 rx_pp_alloc_slow;
+	u64 rx_pp_alloc_slow_high_order;
+	u64 rx_pp_alloc_empty;
+	u64 rx_pp_alloc_refill;
+	u64 rx_pp_alloc_waive;
+	u64 rx_pp_recycle_cached;
+	u64 rx_pp_recycle_cache_full;
+	u64 rx_pp_recycle_ring;
+	u64 rx_pp_recycle_ring_full;
+	u64 rx_pp_recycle_released_ref;
+#endif
 #ifdef CONFIG_MLX5_EN_TLS
 	u64 tx_tls_encrypted_packets;
 	u64 tx_tls_encrypted_bytes;
@@ -352,6 +364,19 @@ struct mlx5e_rq_stats {
 	u64 congst_umr;
 	u64 arfs_err;
 	u64 recover;
+#ifdef CONFIG_PAGE_POOL_STATS
+	u64 pp_alloc_fast;
+	u64 pp_alloc_slow;
+	u64 pp_alloc_slow_high_order;
+	u64 pp_alloc_empty;
+	u64 pp_alloc_refill;
+	u64 pp_alloc_waive;
+	u64 pp_recycle_cached;
+	u64 pp_recycle_cache_full;
+	u64 pp_recycle_ring;
+	u64 pp_recycle_ring_full;
+	u64 pp_recycle_released_ref;
+#endif
 #ifdef CONFIG_MLX5_EN_TLS
 	u64 tls_decrypted_packets;
 	u64 tls_decrypted_bytes;
diff --git a/include/net/page_pool.h b/include/net/page_pool.h
index 97c3c19872ff..ea5fb70e5101 100644
--- a/include/net/page_pool.h
+++ b/include/net/page_pool.h
@@ -84,6 +84,48 @@ struct page_pool_params {
 	void *init_arg;
 };
 
+#ifdef CONFIG_PAGE_POOL_STATS
+struct page_pool_alloc_stats {
+	u64 fast; /* fast path allocations */
+	u64 slow; /* slow-path order 0 allocations */
+	u64 slow_high_order; /* slow-path high order allocations */
+	u64 empty; /* failed refills due to empty ptr ring, forcing
+		    * slow path allocation
+		    */
+	u64 refill; /* allocations via successful refill */
+	u64 waive;  /* failed refills due to numa zone mismatch */
+};
+
+struct page_pool_recycle_stats {
+	u64 cached;	/* recycling placed page in the cache. */
+	u64 cache_full; /* cache was full */
+	u64 ring;	/* recycling placed page back into ptr ring */
+	u64 ring_full;	/* page was released from page-pool because
+			 * PTR ring was full.
+			 */
+	u64 released_refcnt; /* page released because of elevated
+			      * refcnt
+			      */
+};
+
+/* This struct wraps the above stats structs so users of the
+ * page_pool_get_stats API can pass a single argument when requesting the
+ * stats for the page pool.
+ */
+struct page_pool_stats {
+	struct page_pool_alloc_stats alloc_stats;
+	struct page_pool_recycle_stats recycle_stats;
+};
+
+/*
+ * Drivers that wish to harvest page pool stats and report them to users
+ * (perhaps via ethtool, debugfs, or another mechanism) can allocate a
+ * struct page_pool_stats call page_pool_get_stats to get stats for the specified pool.
+ */
+bool page_pool_get_stats(struct page_pool *pool,
+			 struct page_pool_stats *stats);
+#endif
+
 struct page_pool {
 	struct page_pool_params p;
 
@@ -96,6 +138,11 @@ struct page_pool {
 	unsigned int frag_offset;
 	struct page *frag_page;
 	long frag_users;
+
+#ifdef CONFIG_PAGE_POOL_STATS
+	/* these stats are incremented while in softirq context */
+	struct page_pool_alloc_stats alloc_stats;
+#endif
 	u32 xdp_mem_id;
 
 	/*
@@ -126,6 +173,10 @@ struct page_pool {
 	 */
 	struct ptr_ring ring;
 
+#ifdef CONFIG_PAGE_POOL_STATS
+	/* recycle stats are per-cpu to avoid locking */
+	struct page_pool_recycle_stats __percpu *recycle_stats;
+#endif
 	atomic_t pages_state_release_cnt;
 
 	/* A page_pool is strictly tied to a single RX-queue being
diff --git a/net/Kconfig b/net/Kconfig
index 8a1f9d0287de..6b78f695caa6 100644
--- a/net/Kconfig
+++ b/net/Kconfig
@@ -434,6 +434,19 @@ config NET_DEVLINK
 config PAGE_POOL
 	bool
 
+config PAGE_POOL_STATS
+	default n
+	bool "Page pool stats"
+	depends on PAGE_POOL
+	help
+	  Enable page pool statistics to track page allocation and recycling
+	  in page pools. This option incurs additional CPU cost in allocation
+	  and recycle paths and additional memory cost to store the statistics.
+	  These statistics are only available if this option is enabled and if
+	  the driver using the page pool supports exporting this data.
+
+	  If unsure, say N.
+
 config FAILOVER
 	tristate "Generic failover module"
 	help
diff --git a/net/core/page_pool.c b/net/core/page_pool.c
index e25d359d84d9..1943c0f0307d 100644
--- a/net/core/page_pool.c
+++ b/net/core/page_pool.c
@@ -26,6 +26,45 @@
 
 #define BIAS_MAX	LONG_MAX
 
+#ifdef CONFIG_PAGE_POOL_STATS
+/* alloc_stat_inc is intended to be used in softirq context */
+#define alloc_stat_inc(pool, __stat)	(pool->alloc_stats.__stat++)
+/* recycle_stat_inc is safe to use when preemption is possible. */
+#define recycle_stat_inc(pool, __stat)							\
+	do {										\
+		struct page_pool_recycle_stats __percpu *s = pool->recycle_stats;	\
+		this_cpu_inc(s->__stat);						\
+	} while (0)
+
+bool page_pool_get_stats(struct page_pool *pool,
+			 struct page_pool_stats *stats)
+{
+	int cpu = 0;
+
+	if (!stats)
+		return false;
+
+	memcpy(&stats->alloc_stats, &pool->alloc_stats, sizeof(pool->alloc_stats));
+
+	for_each_possible_cpu(cpu) {
+		const struct page_pool_recycle_stats *pcpu =
+			per_cpu_ptr(pool->recycle_stats, cpu);
+
+		stats->recycle_stats.cached += pcpu->cached;
+		stats->recycle_stats.cache_full += pcpu->cache_full;
+		stats->recycle_stats.ring += pcpu->ring;
+		stats->recycle_stats.ring_full += pcpu->ring_full;
+		stats->recycle_stats.released_refcnt += pcpu->released_refcnt;
+	}
+
+	return true;
+}
+EXPORT_SYMBOL(page_pool_get_stats);
+#else
+#define alloc_stat_inc(pool, __stat)
+#define recycle_stat_inc(pool, __stat)
+#endif
+
 static int page_pool_init(struct page_pool *pool,
 			  const struct page_pool_params *params)
 {
@@ -73,6 +112,12 @@ static int page_pool_init(struct page_pool *pool,
 	    pool->p.flags & PP_FLAG_PAGE_FRAG)
 		return -EINVAL;
 
+#ifdef CONFIG_PAGE_POOL_STATS
+	pool->recycle_stats = alloc_percpu(struct page_pool_recycle_stats);
+	if (!pool->recycle_stats)
+		return -ENOMEM;
+#endif
+
 	if (ptr_ring_init(&pool->ring, ring_qsize, GFP_KERNEL) < 0)
 		return -ENOMEM;
 
@@ -117,8 +162,10 @@ static struct page *page_pool_refill_alloc_cache(struct page_pool *pool)
 	int pref_nid; /* preferred NUMA node */
 
 	/* Quicker fallback, avoid locks when ring is empty */
-	if (__ptr_ring_empty(r))
+	if (__ptr_ring_empty(r)) {
+		alloc_stat_inc(pool, empty);
 		return NULL;
+	}
 
 	/* Softirq guarantee CPU and thus NUMA node is stable. This,
 	 * assumes CPU refilling driver RX-ring will also run RX-NAPI.
@@ -145,14 +192,17 @@ static struct page *page_pool_refill_alloc_cache(struct page_pool *pool)
 			 * This limit stress on page buddy alloactor.
 			 */
 			page_pool_return_page(pool, page);
+			alloc_stat_inc(pool, waive);
 			page = NULL;
 			break;
 		}
 	} while (pool->alloc.count < PP_ALLOC_CACHE_REFILL);
 
 	/* Return last page */
-	if (likely(pool->alloc.count > 0))
+	if (likely(pool->alloc.count > 0)) {
 		page = pool->alloc.cache[--pool->alloc.count];
+		alloc_stat_inc(pool, refill);
+	}
 
 	return page;
 }
@@ -166,6 +216,7 @@ static struct page *__page_pool_get_cached(struct page_pool *pool)
 	if (likely(pool->alloc.count)) {
 		/* Fast-path */
 		page = pool->alloc.cache[--pool->alloc.count];
+		alloc_stat_inc(pool, fast);
 	} else {
 		page = page_pool_refill_alloc_cache(pool);
 	}
@@ -239,6 +290,7 @@ static struct page *__page_pool_alloc_page_order(struct page_pool *pool,
 		return NULL;
 	}
 
+	alloc_stat_inc(pool, slow_high_order);
 	page_pool_set_pp_info(pool, page);
 
 	/* Track how many pages are held 'in-flight' */
@@ -293,10 +345,12 @@ static struct page *__page_pool_alloc_pages_slow(struct page_pool *pool,
 	}
 
 	/* Return last page */
-	if (likely(pool->alloc.count > 0))
+	if (likely(pool->alloc.count > 0)) {
 		page = pool->alloc.cache[--pool->alloc.count];
-	else
+		alloc_stat_inc(pool, slow);
+	} else {
 		page = NULL;
+	}
 
 	/* When page just alloc'ed is should/must have refcnt 1. */
 	return page;
@@ -394,7 +448,12 @@ static bool page_pool_recycle_in_ring(struct page_pool *pool, struct page *page)
 	else
 		ret = ptr_ring_produce_bh(&pool->ring, page);
 
-	return (ret == 0) ? true : false;
+	if (!ret) {
+		recycle_stat_inc(pool, ring);
+		return true;
+	}
+
+	return false;
 }
 
 /* Only allow direct recycling in special circumstances, into the
@@ -405,11 +464,14 @@ static bool page_pool_recycle_in_ring(struct page_pool *pool, struct page *page)
 static bool page_pool_recycle_in_cache(struct page *page,
 				       struct page_pool *pool)
 {
-	if (unlikely(pool->alloc.count == PP_ALLOC_CACHE_SIZE))
+	if (unlikely(pool->alloc.count == PP_ALLOC_CACHE_SIZE)) {
+		recycle_stat_inc(pool, cache_full);
 		return false;
+	}
 
 	/* Caller MUST have verified/know (page_ref_count(page) == 1) */
 	pool->alloc.cache[pool->alloc.count++] = page;
+	recycle_stat_inc(pool, cached);
 	return true;
 }
 
@@ -459,6 +521,7 @@ __page_pool_put_page(struct page_pool *pool, struct page *page,
 	 * doing refcnt based recycle tricks, meaning another process
 	 * will be invoking put_page.
 	 */
+	recycle_stat_inc(pool, released_refcnt);
 	/* Do not replace this with page_pool_return_page() */
 	page_pool_release_page(pool, page);
 	put_page(page);
@@ -472,6 +535,7 @@ void page_pool_put_defragged_page(struct page_pool *pool, struct page *page,
 	page = __page_pool_put_page(pool, page, dma_sync_size, allow_direct);
 	if (page && !page_pool_recycle_in_ring(pool, page)) {
 		/* Cache full, fallback to free pages */
+		recycle_stat_inc(pool, ring_full);
 		page_pool_return_page(pool, page);
 	}
 }
@@ -620,6 +684,9 @@ static void page_pool_free(struct page_pool *pool)
 	if (pool->p.flags & PP_FLAG_DMA_MAP)
 		put_device(pool->p.dev);
 
+#ifdef CONFIG_PAGE_POOL_STATS
+	free_percpu(pool->recycle_stats);
+#endif
 	kfree(pool);
 }