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Date: Thu, 01 Dec 2016 08:08:37 -0800
From: Eric Dumazet <eric.dumazet@...il.com>
To: Saeed Mahameed <saeedm@....mellanox.co.il>
Cc: Jesper Dangaard Brouer <brouer@...hat.com>,
David Miller <davem@...emloft.net>,
netdev <netdev@...r.kernel.org>,
Tariq Toukan <tariqt@...lanox.com>
Subject: Re: Regression: [PATCH] mlx4: give precise rx/tx bytes/packets
counters
On Thu, 2016-12-01 at 07:55 -0800, Eric Dumazet wrote:
> So removing the spinlock is doable, but needs to add a new parameter
> to mlx4_en_fold_software_stats() and call netdev_stats_to_stats64()
> before mlx4_en_fold_software_stats(dev)
Untested patch would be :
drivers/net/ethernet/mellanox/mlx4/en_ethtool.c | 2 -
drivers/net/ethernet/mellanox/mlx4/en_netdev.c | 10 +----
drivers/net/ethernet/mellanox/mlx4/en_port.c | 24 +++++++++-----
drivers/net/ethernet/mellanox/mlx4/mlx4_en.h | 3 +
4 files changed, 23 insertions(+), 16 deletions(-)
diff --git a/drivers/net/ethernet/mellanox/mlx4/en_ethtool.c b/drivers/net/ethernet/mellanox/mlx4/en_ethtool.c
index d9c9f86a30df953fa555934c5406057dcaf28960..676050e352703cebe7fcaa5202a06496f7a5a0df 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_ethtool.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_ethtool.c
@@ -367,7 +367,7 @@ static void mlx4_en_get_ethtool_stats(struct net_device *dev,
spin_lock_bh(&priv->stats_lock);
- mlx4_en_fold_software_stats(dev);
+ mlx4_en_fold_software_stats(dev, NULL);
for (i = 0; i < NUM_MAIN_STATS; i++, bitmap_iterator_inc(&it))
if (bitmap_iterator_test(&it))
diff --git a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
index 091b904262bc7932d3edf99cf850affb23b9ce6e..6ee9e31e59c392cb88faedf9c541b3bc6d195228 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
@@ -1321,13 +1321,9 @@ static void mlx4_en_tx_timeout(struct net_device *dev)
static struct rtnl_link_stats64 *
mlx4_en_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
{
- struct mlx4_en_priv *priv = netdev_priv(dev);
-
- spin_lock_bh(&priv->stats_lock);
- mlx4_en_fold_software_stats(dev);
netdev_stats_to_stats64(stats, &dev->stats);
- spin_unlock_bh(&priv->stats_lock);
-
+ /* Must be called after netdev_stats_to_stats64() */
+ mlx4_en_fold_software_stats(dev, stats);
return stats;
}
@@ -1810,7 +1806,7 @@ void mlx4_en_stop_port(struct net_device *dev, int detach)
netif_tx_disable(dev);
spin_lock_bh(&priv->stats_lock);
- mlx4_en_fold_software_stats(dev);
+ mlx4_en_fold_software_stats(dev, NULL);
/* Set port as not active */
priv->port_up = false;
spin_unlock_bh(&priv->stats_lock);
diff --git a/drivers/net/ethernet/mellanox/mlx4/en_port.c b/drivers/net/ethernet/mellanox/mlx4/en_port.c
index 9166d90e732858610b1407fe85cbf6cbe27f5e0b..eea042a18e3cfba62745ece4ca673c2db967b9aa 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_port.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_port.c
@@ -147,7 +147,8 @@ static unsigned long en_stats_adder(__be64 *start, __be64 *next, int num)
return ret;
}
-void mlx4_en_fold_software_stats(struct net_device *dev)
+void mlx4_en_fold_software_stats(struct net_device *dev,
+ struct rtnl_link_stats64 *stats)
{
struct mlx4_en_priv *priv = netdev_priv(dev);
struct mlx4_en_dev *mdev = priv->mdev;
@@ -165,9 +166,13 @@ void mlx4_en_fold_software_stats(struct net_device *dev)
packets += READ_ONCE(ring->packets);
bytes += READ_ONCE(ring->bytes);
}
- dev->stats.rx_packets = packets;
- dev->stats.rx_bytes = bytes;
-
+ if (stats) {
+ stats->rx_packets = packets;
+ stats->rx_bytes = bytes;
+ } else {
+ dev->stats.rx_packets = packets;
+ dev->stats.rx_bytes = bytes;
+ }
packets = 0;
bytes = 0;
for (i = 0; i < priv->tx_ring_num[TX]; i++) {
@@ -176,8 +181,13 @@ void mlx4_en_fold_software_stats(struct net_device *dev)
packets += READ_ONCE(ring->packets);
bytes += READ_ONCE(ring->bytes);
}
- dev->stats.tx_packets = packets;
- dev->stats.tx_bytes = bytes;
+ if (stats) {
+ stats->tx_packets = packets;
+ stats->tx_bytes = bytes;
+ } else {
+ dev->stats.tx_packets = packets;
+ dev->stats.tx_bytes = bytes;
+ }
}
int mlx4_en_DUMP_ETH_STATS(struct mlx4_en_dev *mdev, u8 port, u8 reset)
@@ -208,7 +218,7 @@ int mlx4_en_DUMP_ETH_STATS(struct mlx4_en_dev *mdev, u8 port, u8 reset)
spin_lock_bh(&priv->stats_lock);
- mlx4_en_fold_software_stats(dev);
+ mlx4_en_fold_software_stats(dev, NULL);
priv->port_stats.rx_chksum_good = 0;
priv->port_stats.rx_chksum_none = 0;
diff --git a/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h b/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
index 20a936428f4a44c8ca0a7161855da310f9166b50..92dbb41f425b282e9ab7c8d534f091da0ba661c3 100644
--- a/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
+++ b/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
@@ -755,7 +755,8 @@ void mlx4_en_rx_irq(struct mlx4_cq *mcq);
int mlx4_SET_MCAST_FLTR(struct mlx4_dev *dev, u8 port, u64 mac, u64 clear, u8 mode);
int mlx4_SET_VLAN_FLTR(struct mlx4_dev *dev, struct mlx4_en_priv *priv);
-void mlx4_en_fold_software_stats(struct net_device *dev);
+void mlx4_en_fold_software_stats(struct net_device *dev,
+ struct rtnl_link_stats64 *stats);
int mlx4_en_DUMP_ETH_STATS(struct mlx4_en_dev *mdev, u8 port, u8 reset);
int mlx4_en_QUERY_PORT(struct mlx4_en_dev *mdev, u8 port);
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