[PATCH v4 net-next 0/2] net: mvneta: add support for page_pool_get_stats

[PATCH v4 net-next 0/2] net: mvneta: add support for page_pool_get_stats

[Lorenzo Bianconi]

Introduce page_pool stats ethtool APIs in order to avoid driver duplicated
code.

Changes since v3:
- get rid of wrong for loop in page_pool_ethtool_stats_get()
- add API stubs when page_pool_stats are not compiled in

Changes since v2:
- remove enum list of page_pool stats in page_pool.h
- remove leftover change in mvneta.c for ethtool_stats array allocation

Changes since v1:
- move stats accounting to page_pool code
- move stats string management to page_pool code

Lorenzo Bianconi (2):
  net: page_pool: introduce ethtool stats
  net: mvneta: add support for page_pool_get_stats

 drivers/net/ethernet/marvell/Kconfig  |  1 +
 drivers/net/ethernet/marvell/mvneta.c | 20 ++++++++-
 include/net/page_pool.h               | 21 +++++++++
 net/core/page_pool.c                  | 63 ++++++++++++++++++++++++++-
 4 files changed, 103 insertions(+), 2 deletions(-)

-- 
2.35.1

[PATCH v4 net-next 1/2] net: page_pool: introduce ethtool stats

[Lorenzo Bianconi]

Introduce page_pool APIs to report stats through ethtool and reduce
duplicated code in each driver.

Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
---
 include/net/page_pool.h | 21 ++++++++++++++
 net/core/page_pool.c    | 63 ++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 83 insertions(+), 1 deletion(-)

diff --git a/include/net/page_pool.h b/include/net/page_pool.h
index ea5fb70e5101..813c93499f20 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, void *stats);
+
 /*
  * Drivers that wish to harvest page pool stats and report them to users
  * (perhaps via ethtool, debugfs, or another mechanism) can allocate a
@@ -124,6 +128,23 @@ struct page_pool_stats {
  */
 bool page_pool_get_stats(struct page_pool *pool,
 			 struct page_pool_stats *stats);
+#else
+
+static inline int page_pool_ethtool_stats_get_count(void)
+{
+	return 0;
+}
+
+static inline u8 *page_pool_ethtool_stats_get_strings(u8 *data)
+{
+	return data;
+}
+
+static inline u64 *page_pool_ethtool_stats_get(u64 *data, void *stats)
+{
+	return data;
+}
+
 #endif
 
 struct page_pool {
diff --git a/net/core/page_pool.c b/net/core/page_pool.c
index 4af55d28ffa3..90130f5a519e 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 +87,46 @@ 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, void *stats)
+{
+	struct page_pool_stats *pp_stats = stats;
+
+	*data++ = pp_stats->alloc_stats.fast;
+	*data++ = pp_stats->alloc_stats.slow;
+	*data++ = pp_stats->alloc_stats.slow_high_order;
+	*data++ = pp_stats->alloc_stats.empty;
+	*data++ = pp_stats->alloc_stats.refill;
+	*data++ = pp_stats->alloc_stats.waive;
+	*data++ = pp_stats->recycle_stats.cached;
+	*data++ = pp_stats->recycle_stats.cache_full;
+	*data++ = pp_stats->recycle_stats.ring;
+	*data++ = pp_stats->recycle_stats.ring_full;
+	*data++ = pp_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

[PATCH v4 net-next 2/2] net: mvneta: add support for page_pool_get_stats

[Lorenzo Bianconi]

Introduce support for the page_pool stats APIs into mvneta driver.
Report page_pool stats through ethtool.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
---
 drivers/net/ethernet/marvell/Kconfig  |  1 +
 drivers/net/ethernet/marvell/mvneta.c | 20 +++++++++++++++++++-
 2 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/marvell/Kconfig b/drivers/net/ethernet/marvell/Kconfig
index fe0989c0fc25..1240cb2dc07f 100644
--- a/drivers/net/ethernet/marvell/Kconfig
+++ b/drivers/net/ethernet/marvell/Kconfig
@@ -62,6 +62,7 @@ config MVNETA
 	select MVMDIO
 	select PHYLINK
 	select PAGE_POOL
+	select PAGE_POOL_STATS
 	help
 	  This driver supports the network interface units in the
 	  Marvell ARMADA XP, ARMADA 370, ARMADA 38x and
diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c
index 934f6dd90992..f6a54c7f0c69 100644
--- a/drivers/net/ethernet/marvell/mvneta.c
+++ b/drivers/net/ethernet/marvell/mvneta.c
@@ -4735,6 +4735,9 @@ static void mvneta_ethtool_get_strings(struct net_device *netdev, u32 sset,
 		for (i = 0; i < ARRAY_SIZE(mvneta_statistics); i++)
 			memcpy(data + i * ETH_GSTRING_LEN,
 			       mvneta_statistics[i].name, ETH_GSTRING_LEN);
+
+		data += ETH_GSTRING_LEN * ARRAY_SIZE(mvneta_statistics);
+		page_pool_ethtool_stats_get_strings(data);
 	}
 }
 
@@ -4847,6 +4850,17 @@ static void mvneta_ethtool_update_stats(struct mvneta_port *pp)
 	}
 }
 
+static void mvneta_ethtool_pp_stats(struct mvneta_port *pp, u64 *data)
+{
+	struct page_pool_stats stats = {};
+	int i;
+
+	for (i = 0; i < rxq_number; i++)
+		page_pool_get_stats(pp->rxqs[i].page_pool, &stats);
+
+	page_pool_ethtool_stats_get(data, &stats);
+}
+
 static void mvneta_ethtool_get_stats(struct net_device *dev,
 				     struct ethtool_stats *stats, u64 *data)
 {
@@ -4857,12 +4871,16 @@ static void mvneta_ethtool_get_stats(struct net_device *dev,
 
 	for (i = 0; i < ARRAY_SIZE(mvneta_statistics); i++)
 		*data++ = pp->ethtool_stats[i];
+
+	mvneta_ethtool_pp_stats(pp, data);
 }
 
 static int mvneta_ethtool_get_sset_count(struct net_device *dev, int sset)
 {
 	if (sset == ETH_SS_STATS)
-		return ARRAY_SIZE(mvneta_statistics);
+		return ARRAY_SIZE(mvneta_statistics) +
+		       page_pool_ethtool_stats_get_count();
+
 	return -EOPNOTSUPP;
 }
 
-- 
2.35.1

Re: [PATCH v4 net-next 0/2] net: mvneta: add support for page_pool_get_stats

[Jakub Kicinski]

On Mon, 11 Apr 2022 17:11:40 +0200 Lorenzo Bianconi wrote:
> Introduce page_pool stats ethtool APIs in order to avoid driver duplicated
> code.

Does not apply at the time of posting.

If series depends on other patches people post it as RFC until
dependencies are merged.

Re: [PATCH v4 net-next 0/2] net: mvneta: add support for page_pool_get_stats

[Lorenzo Bianconi]

[-- Attachment #1: Type: text/plain, Size: 595 bytes --]

> On Mon, 11 Apr 2022 17:11:40 +0200 Lorenzo Bianconi wrote:
> > Introduce page_pool stats ethtool APIs in order to avoid driver duplicated
> > code.
> 
> Does not apply at the time of posting.

Yep, sorry. This series depends on the following patch I posted:

"v2: page_pool: Add recycle stats to page_pool_put_page_bulk"
https://lore.kernel.org/netdev/CAC_iWjJZYBR2OAUJuqrUU+UxX3G17OLZ6sgchOhfaWgB=reGTw@mail.gmail.com/T/#t

I will repost when it is merged.

Regards,
Lorenzo
> 
> If series depends on other patches people post it as RFC until
> dependencies are merged.
> 

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