netdev - [net-next v4 11/11] page_pool: Add function to batch and return stats

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Message-Id: <1643933373-6590-12-git-send-email-jdamato@fastly.com>
Date:   Thu,  3 Feb 2022 16:09:33 -0800
From:   Joe Damato <jdamato@...tly.com>
To:     netdev@...r.kernel.org, kuba@...nel.org,
        ilias.apalodimas@...aro.org, davem@...emloft.net, hawk@...nel.org,
        saeed@...nel.org, ttoukan.linux@...il.com, brouer@...hat.com
Cc:     Joe Damato <jdamato@...tly.com>
Subject: [net-next v4 11/11] page_pool: Add function to batch and return stats

Adds a function page_pool_get_stats which can be used by drivers to obtain
the batched stats for a specified page pool.

Signed-off-by: Joe Damato <jdamato@...tly.com>
---
 include/net/page_pool.h |  9 +++++++++
 net/core/page_pool.c    | 25 +++++++++++++++++++++++++
 2 files changed, 34 insertions(+)

diff --git a/include/net/page_pool.h b/include/net/page_pool.h
index bb87706..5257e46 100644
--- a/include/net/page_pool.h
+++ b/include/net/page_pool.h
@@ -153,6 +153,15 @@ struct page_pool_stats {
 		u64 waive;  /* failed refills due to numa zone mismatch */
 	} alloc;
 };
+
+/*
+ * 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 and call page_pool_get_stats to get the batched pcpu
+ * stats.
+ */
+struct page_pool_stats *page_pool_get_stats(struct page_pool *pool,
+					    struct page_pool_stats *stats);
 #endif
 
 struct page *page_pool_alloc_pages(struct page_pool *pool, gfp_t gfp);
diff --git a/net/core/page_pool.c b/net/core/page_pool.c
index 0bd084c..076593bb 100644
--- a/net/core/page_pool.c
+++ b/net/core/page_pool.c
@@ -35,6 +35,31 @@
 		struct page_pool_stats __percpu *s = pool->stats;	\
 		__this_cpu_inc(s->alloc.__stat);			\
 	} while (0)
+
+struct page_pool_stats *page_pool_get_stats(struct page_pool *pool,
+					    struct page_pool_stats *stats)
+{
+	int cpu = 0;
+
+	if (!stats)
+		return NULL;
+
+	for_each_possible_cpu(cpu) {
+		const struct page_pool_stats *pcpu =
+			per_cpu_ptr(pool->stats, cpu);
+
+		stats->alloc.fast += pcpu->alloc.fast;
+		stats->alloc.slow += pcpu->alloc.slow;
+		stats->alloc.slow_high_order +=
+			pcpu->alloc.slow_high_order;
+		stats->alloc.empty += pcpu->alloc.empty;
+		stats->alloc.refill += pcpu->alloc.refill;
+		stats->alloc.waive += pcpu->alloc.waive;
+	}
+
+	return stats;
+}
+EXPORT_SYMBOL(page_pool_get_stats);
 #else
 #define this_cpu_inc_alloc_stat(pool, __stat)
 #endif
-- 
2.7.4