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Message-Id: <628c0a6d9bdbc547c93fcd4ae2e84d08af7bc8e1.1649528984.git.lorenzo@kernel.org>
Date: Sat, 9 Apr 2022 20:39:10 +0200
From: Lorenzo Bianconi <lorenzo@...nel.org>
To: netdev@...r.kernel.org
Cc: lorenzo.bianconi@...hat.com, davem@...emloft.net, kuba@...nel.org,
pabeni@...hat.com, thomas.petazzoni@...tlin.com,
linux@...linux.org.uk, jbrouer@...hat.com,
ilias.apalodimas@...aro.org, jdamato@...tly.com, andrew@...n.ch
Subject: [PATCH v3 net-next 1/2] net: page_pool: introduce ethtool stats
Introduce page_pool APIs to report stats through ethtool and reduce
duplicated code in each driver.
Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
---
include/net/page_pool.h | 4 +++
net/core/page_pool.c | 64 ++++++++++++++++++++++++++++++++++++++++-
2 files changed, 67 insertions(+), 1 deletion(-)
diff --git a/include/net/page_pool.h b/include/net/page_pool.h
index ea5fb70e5101..94b2d666db03 100644
--- a/include/net/page_pool.h
+++ b/include/net/page_pool.h
@@ -117,6 +117,10 @@ struct page_pool_stats {
struct page_pool_recycle_stats recycle_stats;
};
+int page_pool_ethtool_stats_get_count(void);
+u8 *page_pool_ethtool_stats_get_strings(u8 *data);
+u64 *page_pool_ethtool_stats_get(u64 *data, struct page_pool_stats *stats);
+
/*
* Drivers that wish to harvest page pool stats and report them to users
* (perhaps via ethtool, debugfs, or another mechanism) can allocate a
diff --git a/net/core/page_pool.c b/net/core/page_pool.c
index 4af55d28ffa3..e82b94040ed1 100644
--- a/net/core/page_pool.c
+++ b/net/core/page_pool.c
@@ -18,6 +18,7 @@
#include <linux/page-flags.h>
#include <linux/mm.h> /* for __put_page() */
#include <linux/poison.h>
+#include <linux/ethtool.h>
#include <trace/events/page_pool.h>
@@ -42,6 +43,20 @@
this_cpu_add(s->__stat, val); \
} while (0)
+static const char pp_stats[][ETH_GSTRING_LEN] = {
+ "rx_pp_alloc_fast",
+ "rx_pp_alloc_slow",
+ "rx_pp_alloc_slow_ho",
+ "rx_pp_alloc_empty",
+ "rx_pp_alloc_refill",
+ "rx_pp_alloc_waive",
+ "rx_pp_recycle_cached",
+ "rx_pp_recycle_cache_full",
+ "rx_pp_recycle_ring",
+ "rx_pp_recycle_ring_full",
+ "rx_pp_recycle_released_ref",
+};
+
bool page_pool_get_stats(struct page_pool *pool,
struct page_pool_stats *stats)
{
@@ -50,7 +65,13 @@ bool page_pool_get_stats(struct page_pool *pool,
if (!stats)
return false;
- memcpy(&stats->alloc_stats, &pool->alloc_stats, sizeof(pool->alloc_stats));
+ /* The caller is responsible to initialize stats. */
+ stats->alloc_stats.fast += pool->alloc_stats.fast;
+ stats->alloc_stats.slow += pool->alloc_stats.slow;
+ stats->alloc_stats.slow_high_order += pool->alloc_stats.slow_high_order;
+ stats->alloc_stats.empty += pool->alloc_stats.empty;
+ stats->alloc_stats.refill += pool->alloc_stats.refill;
+ stats->alloc_stats.waive += pool->alloc_stats.waive;
for_each_possible_cpu(cpu) {
const struct page_pool_recycle_stats *pcpu =
@@ -66,6 +87,47 @@ bool page_pool_get_stats(struct page_pool *pool,
return true;
}
EXPORT_SYMBOL(page_pool_get_stats);
+
+u8 *page_pool_ethtool_stats_get_strings(u8 *data)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(pp_stats); i++) {
+ memcpy(data, pp_stats[i], ETH_GSTRING_LEN);
+ data += ETH_GSTRING_LEN;
+ }
+
+ return data;
+}
+EXPORT_SYMBOL(page_pool_ethtool_stats_get_strings);
+
+int page_pool_ethtool_stats_get_count(void)
+{
+ return ARRAY_SIZE(pp_stats);
+}
+EXPORT_SYMBOL(page_pool_ethtool_stats_get_count);
+
+u64 *page_pool_ethtool_stats_get(u64 *data, struct page_pool_stats *stats)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(pp_stats); i++) {
+ *data++ = stats->alloc_stats.fast;
+ *data++ = stats->alloc_stats.slow;
+ *data++ = stats->alloc_stats.slow_high_order;
+ *data++ = stats->alloc_stats.empty;
+ *data++ = stats->alloc_stats.refill;
+ *data++ = stats->alloc_stats.waive;
+ *data++ = stats->recycle_stats.cached;
+ *data++ = stats->recycle_stats.cache_full;
+ *data++ = stats->recycle_stats.ring;
+ *data++ = stats->recycle_stats.ring_full;
+ *data++ = stats->recycle_stats.released_refcnt;
+ }
+
+ return data;
+}
+EXPORT_SYMBOL(page_pool_ethtool_stats_get);
#else
#define alloc_stat_inc(pool, __stat)
#define recycle_stat_inc(pool, __stat)
--
2.35.1
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