From 5a1647c391ba543a77a400dddf89053ec5c2b7a4 Mon Sep 17 00:00:00 2001 From: Eran Ben Elisha Date: Wed, 13 Dec 2017 18:12:11 +0200 Subject: [PATCH] net/mlx4_en: Fill all counters under one call of stats lock Before this patch, the stats_lock was acquired twice. In between the locks Driver sent command to gather some more statistics (per priority and counter statistics). If the stats lock was acquired by get statistics NDO in between we would have report out of sync counters. Fix this by collecting all stats from Firmware in advance and then fill the Software structs under one lock. Fixes: 0b131561a7d6 ("net/mlx4_en: Add Flow control statistics display via ethtool") Signed-off-by: Eran Ben Elisha Signed-off-by: Tariq Toukan Signed-off-by: David S. Miller --- drivers/net/ethernet/mellanox/mlx4/en_port.c | 57 +++++++++++--------- 1 file changed, 31 insertions(+), 26 deletions(-) diff --git a/drivers/net/ethernet/mellanox/mlx4/en_port.c b/drivers/net/ethernet/mellanox/mlx4/en_port.c index e0eb695318e6..1fa4849a6f56 100644 --- a/drivers/net/ethernet/mellanox/mlx4/en_port.c +++ b/drivers/net/ethernet/mellanox/mlx4/en_port.c @@ -188,7 +188,7 @@ int mlx4_en_DUMP_ETH_STATS(struct mlx4_en_dev *mdev, u8 port, u8 reset) struct net_device *dev = mdev->pndev[port]; struct mlx4_en_priv *priv = netdev_priv(dev); struct net_device_stats *stats = &dev->stats; - struct mlx4_cmd_mailbox *mailbox; + struct mlx4_cmd_mailbox *mailbox, *mailbox_priority; u64 in_mod = reset << 8 | port; int err; int i, counter_index; @@ -198,6 +198,13 @@ int mlx4_en_DUMP_ETH_STATS(struct mlx4_en_dev *mdev, u8 port, u8 reset) mailbox = mlx4_alloc_cmd_mailbox(mdev->dev); if (IS_ERR(mailbox)) return PTR_ERR(mailbox); + + mailbox_priority = mlx4_alloc_cmd_mailbox(mdev->dev); + if (IS_ERR(mailbox_priority)) { + mlx4_free_cmd_mailbox(mdev->dev, mailbox); + return PTR_ERR(mailbox_priority); + } + err = mlx4_cmd_box(mdev->dev, 0, mailbox->dma, in_mod, 0, MLX4_CMD_DUMP_ETH_STATS, MLX4_CMD_TIME_CLASS_B, MLX4_CMD_NATIVE); @@ -206,6 +213,28 @@ int mlx4_en_DUMP_ETH_STATS(struct mlx4_en_dev *mdev, u8 port, u8 reset) mlx4_en_stats = mailbox->buf; + memset(&tmp_counter_stats, 0, sizeof(tmp_counter_stats)); + counter_index = mlx4_get_default_counter_index(mdev->dev, port); + err = mlx4_get_counter_stats(mdev->dev, counter_index, + &tmp_counter_stats, reset); + + /* 0xffs indicates invalid value */ + memset(mailbox_priority->buf, 0xff, + sizeof(*flowstats) * MLX4_NUM_PRIORITIES); + + if (mdev->dev->caps.flags2 & MLX4_DEV_CAP_FLAG2_FLOWSTATS_EN) { + memset(mailbox_priority->buf, 0, + sizeof(*flowstats) * MLX4_NUM_PRIORITIES); + err = mlx4_cmd_box(mdev->dev, 0, mailbox_priority->dma, + in_mod | MLX4_DUMP_ETH_STATS_FLOW_CONTROL, + 0, MLX4_CMD_DUMP_ETH_STATS, + MLX4_CMD_TIME_CLASS_B, MLX4_CMD_NATIVE); + if (err) + goto out; + } + + flowstats = mailbox_priority->buf; + spin_lock_bh(&priv->stats_lock); mlx4_en_fold_software_stats(dev); @@ -345,31 +374,6 @@ int mlx4_en_DUMP_ETH_STATS(struct mlx4_en_dev *mdev, u8 port, u8 reset) priv->pkstats.tx_prio[8][0] = be64_to_cpu(mlx4_en_stats->TTOT_novlan); priv->pkstats.tx_prio[8][1] = be64_to_cpu(mlx4_en_stats->TOCT_novlan); - spin_unlock_bh(&priv->stats_lock); - - memset(&tmp_counter_stats, 0, sizeof(tmp_counter_stats)); - counter_index = mlx4_get_default_counter_index(mdev->dev, port); - err = mlx4_get_counter_stats(mdev->dev, counter_index, - &tmp_counter_stats, reset); - - /* 0xffs indicates invalid value */ - memset(mailbox->buf, 0xff, sizeof(*flowstats) * MLX4_NUM_PRIORITIES); - - if (mdev->dev->caps.flags2 & MLX4_DEV_CAP_FLAG2_FLOWSTATS_EN) { - memset(mailbox->buf, 0, - sizeof(*flowstats) * MLX4_NUM_PRIORITIES); - err = mlx4_cmd_box(mdev->dev, 0, mailbox->dma, - in_mod | MLX4_DUMP_ETH_STATS_FLOW_CONTROL, - 0, MLX4_CMD_DUMP_ETH_STATS, - MLX4_CMD_TIME_CLASS_B, MLX4_CMD_NATIVE); - if (err) - goto out; - } - - flowstats = mailbox->buf; - - spin_lock_bh(&priv->stats_lock); - if (tmp_counter_stats.counter_mode == 0) { priv->pf_stats.rx_bytes = be64_to_cpu(tmp_counter_stats.rx_bytes); priv->pf_stats.tx_bytes = be64_to_cpu(tmp_counter_stats.tx_bytes); @@ -410,6 +414,7 @@ int mlx4_en_DUMP_ETH_STATS(struct mlx4_en_dev *mdev, u8 port, u8 reset) out: mlx4_free_cmd_mailbox(mdev->dev, mailbox); + mlx4_free_cmd_mailbox(mdev->dev, mailbox_priority); return err; }