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Message-Id: <20170512115650.11635-2-saeedm@mellanox.com>
Date: Fri, 12 May 2017 14:56:45 +0300
From: Saeed Mahameed <saeedm@...lanox.com>
To: "David S. Miller" <davem@...emloft.net>
Cc: netdev@...r.kernel.org, Gal Pressman <galp@...lanox.com>,
kernel-team@...com, Saeed Mahameed <saeedm@...lanox.com>
Subject: [net 1/6] net/mlx5e: Use a spinlock to synchronize statistics
From: Gal Pressman <galp@...lanox.com>
Add a spinlock to prevent races when querying statistics, for example
querying counters in the middle of a non atomic memcpy() operation in
mlx5e_update_stats().
This RW lock should be held when accessing priv->stats, to prevent other
reads/writes.
Fixes: 9218b44dcc05 ("net/mlx5e: Statistics handling refactoring")
Signed-off-by: Gal Pressman <galp@...lanox.com>
Suggested-by: Eric Dumazet <eric.dumazet@...il.com>
Cc: kernel-team@...com
Signed-off-by: Saeed Mahameed <saeedm@...lanox.com>
---
drivers/net/ethernet/mellanox/mlx5/core/en.h | 1 +
.../net/ethernet/mellanox/mlx5/core/en_ethtool.c | 12 ++++--
drivers/net/ethernet/mellanox/mlx5/core/en_main.c | 45 ++++++++++++++++------
3 files changed, 44 insertions(+), 14 deletions(-)
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en.h b/drivers/net/ethernet/mellanox/mlx5/core/en.h
index 0099a3e397bc..c41cf7e82795 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en.h
@@ -756,6 +756,7 @@ struct mlx5e_priv {
struct mlx5_core_dev *mdev;
struct net_device *netdev;
struct mlx5e_stats stats;
+ rwlock_t stats_lock;
struct mlx5e_tstamp tstamp;
u16 q_counter;
#ifdef CONFIG_MLX5_CORE_EN_DCB
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c b/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c
index ce7b09d72ff6..0a7734761ece 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c
@@ -305,6 +305,7 @@ static void mlx5e_get_ethtool_stats(struct net_device *dev,
struct mlx5_priv *mlx5_priv;
int i, j, tc, prio, idx = 0;
unsigned long pfc_combined;
+ bool global_pause;
if (!data)
return;
@@ -313,8 +314,11 @@ static void mlx5e_get_ethtool_stats(struct net_device *dev,
if (test_bit(MLX5E_STATE_OPENED, &priv->state))
mlx5e_update_stats(priv);
channels = &priv->channels;
+ pfc_combined = mlx5e_query_pfc_combined(priv);
+ global_pause = mlx5e_query_global_pause_combined(priv);
mutex_unlock(&priv->state_lock);
+ read_lock(&priv->stats_lock);
for (i = 0; i < NUM_SW_COUNTERS; i++)
data[idx++] = MLX5E_READ_CTR64_CPU(&priv->stats.sw,
sw_stats_desc, i);
@@ -353,7 +357,6 @@ static void mlx5e_get_ethtool_stats(struct net_device *dev,
pport_per_prio_traffic_stats_desc, i);
}
- pfc_combined = mlx5e_query_pfc_combined(priv);
for_each_set_bit(prio, &pfc_combined, NUM_PPORT_PRIO) {
for (i = 0; i < NUM_PPORT_PER_PRIO_PFC_COUNTERS; i++) {
data[idx++] = MLX5E_READ_CTR64_BE(&priv->stats.pport.per_prio_counters[prio],
@@ -361,7 +364,7 @@ static void mlx5e_get_ethtool_stats(struct net_device *dev,
}
}
- if (mlx5e_query_global_pause_combined(priv)) {
+ if (global_pause) {
for (i = 0; i < NUM_PPORT_PER_PRIO_PFC_COUNTERS; i++) {
data[idx++] = MLX5E_READ_CTR64_BE(&priv->stats.pport.per_prio_counters[0],
pport_per_prio_pfc_stats_desc, i);
@@ -379,7 +382,7 @@ static void mlx5e_get_ethtool_stats(struct net_device *dev,
mlx5e_pme_error_desc, i);
if (!test_bit(MLX5E_STATE_OPENED, &priv->state))
- return;
+ goto out;
/* per channel counters */
for (i = 0; i < channels->num; i++)
@@ -393,6 +396,9 @@ static void mlx5e_get_ethtool_stats(struct net_device *dev,
for (j = 0; j < NUM_SQ_STATS; j++)
data[idx++] = MLX5E_READ_CTR64_CPU(&channels->c[i]->sq[tc].stats,
sq_stats_desc, j);
+
+out:
+ read_unlock(&priv->stats_lock);
}
static u32 mlx5e_rx_wqes_to_packets(struct mlx5e_priv *priv, int rq_wq_type,
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
index a61b71b6fff3..7ac6bcc0e227 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -166,6 +166,13 @@ static void mlx5e_tx_timeout_work(struct work_struct *work)
rtnl_unlock();
}
+#define MLX5E_STATS_WRITE(priv, name, s) \
+ do { \
+ write_lock(&(priv)->stats_lock); \
+ memcpy(&(priv)->stats.name, (s), sizeof(*(s))); \
+ write_unlock(&(priv)->stats_lock); \
+ } while (0)
+
static void mlx5e_update_sw_counters(struct mlx5e_priv *priv)
{
struct mlx5e_sw_stats temp, *s = &temp;
@@ -222,17 +229,21 @@ static void mlx5e_update_sw_counters(struct mlx5e_priv *priv)
s->tx_csum_partial = s->tx_packets - tx_offload_none - s->tx_csum_partial_inner;
s->rx_csum_unnecessary = s->rx_packets - s->rx_csum_none - s->rx_csum_complete;
+ read_lock(&priv->stats_lock);
s->link_down_events_phy = MLX5_GET(ppcnt_reg,
priv->stats.pport.phy_counters,
counter_set.phys_layer_cntrs.link_down_events);
- memcpy(&priv->stats.sw, s, sizeof(*s));
+ read_unlock(&priv->stats_lock);
+
+ MLX5E_STATS_WRITE(priv, sw, s);
}
static void mlx5e_update_vport_counters(struct mlx5e_priv *priv)
{
int outlen = MLX5_ST_SZ_BYTES(query_vport_counter_out);
- u32 *out = (u32 *)priv->stats.vport.query_vport_out;
u32 in[MLX5_ST_SZ_DW(query_vport_counter_in)] = {0};
+ struct mlx5e_vport_stats vstats;
+ u32 *out = (u32 *)vstats.query_vport_out;
struct mlx5_core_dev *mdev = priv->mdev;
MLX5_SET(query_vport_counter_in, in, opcode,
@@ -241,19 +252,22 @@ static void mlx5e_update_vport_counters(struct mlx5e_priv *priv)
MLX5_SET(query_vport_counter_in, in, other_vport, 0);
mlx5_cmd_exec(mdev, in, sizeof(in), out, outlen);
+
+ MLX5E_STATS_WRITE(priv, vport, &vstats);
}
static void mlx5e_update_pport_counters(struct mlx5e_priv *priv)
{
- struct mlx5e_pport_stats *pstats = &priv->stats.pport;
struct mlx5_core_dev *mdev = priv->mdev;
int sz = MLX5_ST_SZ_BYTES(ppcnt_reg);
- int prio;
+ struct mlx5e_pport_stats *pstats;
void *out;
+ int prio;
u32 *in;
- in = mlx5_vzalloc(sz);
- if (!in)
+ in = mlx5_vzalloc(sz);
+ pstats = mlx5_vzalloc(sizeof(*pstats));
+ if (!in || !pstats)
goto free_out;
MLX5_SET(ppcnt_reg, in, local_port, 1);
@@ -288,26 +302,31 @@ static void mlx5e_update_pport_counters(struct mlx5e_priv *priv)
MLX5_REG_PPCNT, 0, 0);
}
+ MLX5E_STATS_WRITE(priv, pport, pstats);
+
free_out:
kvfree(in);
+ kvfree(pstats);
}
static void mlx5e_update_q_counter(struct mlx5e_priv *priv)
{
- struct mlx5e_qcounter_stats *qcnt = &priv->stats.qcnt;
+ struct mlx5e_qcounter_stats qcnt;
if (!priv->q_counter)
return;
mlx5_core_query_out_of_buffer(priv->mdev, priv->q_counter,
- &qcnt->rx_out_of_buffer);
+ &qcnt.rx_out_of_buffer);
+
+ MLX5E_STATS_WRITE(priv, qcnt, &qcnt);
}
static void mlx5e_update_pcie_counters(struct mlx5e_priv *priv)
{
- struct mlx5e_pcie_stats *pcie_stats = &priv->stats.pcie;
struct mlx5_core_dev *mdev = priv->mdev;
int sz = MLX5_ST_SZ_BYTES(mpcnt_reg);
+ struct mlx5e_pcie_stats pcie_stats;
void *out;
u32 *in;
@@ -318,10 +337,12 @@ static void mlx5e_update_pcie_counters(struct mlx5e_priv *priv)
if (!in)
return;
- out = pcie_stats->pcie_perf_counters;
+ out = pcie_stats.pcie_perf_counters;
MLX5_SET(mpcnt_reg, in, grp, MLX5_PCIE_PERFORMANCE_COUNTERS_GROUP);
mlx5_core_access_reg(mdev, in, sz, out, sz, MLX5_REG_MPCNT, 0, 0);
+ MLX5E_STATS_WRITE(priv, pcie, &pcie_stats);
+
kvfree(in);
}
@@ -3030,6 +3051,7 @@ mlx5e_get_stats(struct net_device *dev, struct rtnl_link_stats64 *stats)
struct mlx5e_vport_stats *vstats = &priv->stats.vport;
struct mlx5e_pport_stats *pstats = &priv->stats.pport;
+ read_lock(&priv->stats_lock);
if (mlx5e_is_uplink_rep(priv)) {
stats->rx_packets = PPORT_802_3_GET(pstats, a_frames_received_ok);
stats->rx_bytes = PPORT_802_3_GET(pstats, a_octets_received_ok);
@@ -3064,7 +3086,7 @@ mlx5e_get_stats(struct net_device *dev, struct rtnl_link_stats64 *stats)
*/
stats->multicast =
VPORT_COUNTER_GET(vstats, received_eth_multicast.packets);
-
+ read_unlock(&priv->stats_lock);
}
static void mlx5e_set_rx_mode(struct net_device *dev)
@@ -3901,6 +3923,7 @@ static void mlx5e_build_nic_netdev_priv(struct mlx5_core_dev *mdev,
mlx5e_build_nic_params(mdev, &priv->channels.params, profile->max_nch(mdev));
mutex_init(&priv->state_lock);
+ rwlock_init(&priv->stats_lock);
INIT_WORK(&priv->update_carrier_work, mlx5e_update_carrier_work);
INIT_WORK(&priv->set_rx_mode_work, mlx5e_set_rx_mode_work);
--
2.11.0
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