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Message-ID: <20231012192750.124945-6-saeed@kernel.org>
Date: Thu, 12 Oct 2023 12:27:40 -0700
From: Saeed Mahameed <saeed@...nel.org>
To: "David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
Eric Dumazet <edumazet@...gle.com>
Cc: Saeed Mahameed <saeedm@...dia.com>,
netdev@...r.kernel.org,
Tariq Toukan <tariqt@...dia.com>,
Shay Drory <shayd@...dia.com>,
Mark Bloch <mbloch@...dia.com>
Subject: [net-next V2 05/15] net/mlx5: Replace global mlx5_intf_lock with HCA devcom component lock
From: Shay Drory <shayd@...dia.com>
mlx5_intf_lock is used to sync between LAG changes and its slaves
mlx5 core dev aux devices changes, which means every time mlx5 core
dev add/remove aux devices, mlx5 is taking this global lock, even if
LAG functionality isn't supported over the core dev.
This cause a bottleneck when probing VFs/SFs in parallel.
Hence, replace mlx5_intf_lock with HCA devcom component lock, or no
lock if LAG functionality isn't supported.
Signed-off-by: Shay Drory <shayd@...dia.com>
Reviewed-by: Mark Bloch <mbloch@...dia.com>
Signed-off-by: Saeed Mahameed <saeedm@...dia.com>
---
drivers/net/ethernet/mellanox/mlx5/core/dev.c | 37 +++++--------------
.../net/ethernet/mellanox/mlx5/core/lag/lag.c | 35 +++++++++++++++---
.../net/ethernet/mellanox/mlx5/core/lag/lag.h | 1 +
.../ethernet/mellanox/mlx5/core/lag/mpesw.c | 9 ++++-
.../ethernet/mellanox/mlx5/core/lib/devcom.c | 7 ++++
.../ethernet/mellanox/mlx5/core/lib/devcom.h | 1 +
.../ethernet/mellanox/mlx5/core/mlx5_core.h | 8 ++--
7 files changed, 59 insertions(+), 39 deletions(-)
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/dev.c b/drivers/net/ethernet/mellanox/mlx5/core/dev.c
index 6e3a8c22881f..cf0477f53dc4 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/dev.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/dev.c
@@ -38,8 +38,6 @@
#include "devlink.h"
#include "lag/lag.h"
-/* intf dev list mutex */
-static DEFINE_MUTEX(mlx5_intf_mutex);
static DEFINE_IDA(mlx5_adev_ida);
static bool is_eth_rep_supported(struct mlx5_core_dev *dev)
@@ -337,9 +335,9 @@ static void del_adev(struct auxiliary_device *adev)
void mlx5_dev_set_lightweight(struct mlx5_core_dev *dev)
{
- mutex_lock(&mlx5_intf_mutex);
+ mlx5_devcom_comp_lock(dev->priv.hca_devcom_comp);
dev->priv.flags |= MLX5_PRIV_FLAGS_DISABLE_ALL_ADEV;
- mutex_unlock(&mlx5_intf_mutex);
+ mlx5_devcom_comp_unlock(dev->priv.hca_devcom_comp);
}
bool mlx5_dev_is_lightweight(struct mlx5_core_dev *dev)
@@ -355,7 +353,7 @@ int mlx5_attach_device(struct mlx5_core_dev *dev)
int ret = 0, i;
devl_assert_locked(priv_to_devlink(dev));
- mutex_lock(&mlx5_intf_mutex);
+ mlx5_devcom_comp_lock(dev->priv.hca_devcom_comp);
priv->flags &= ~MLX5_PRIV_FLAGS_DETACH;
for (i = 0; i < ARRAY_SIZE(mlx5_adev_devices); i++) {
if (!priv->adev[i]) {
@@ -400,7 +398,7 @@ int mlx5_attach_device(struct mlx5_core_dev *dev)
break;
}
}
- mutex_unlock(&mlx5_intf_mutex);
+ mlx5_devcom_comp_unlock(dev->priv.hca_devcom_comp);
return ret;
}
@@ -413,7 +411,7 @@ void mlx5_detach_device(struct mlx5_core_dev *dev, bool suspend)
int i;
devl_assert_locked(priv_to_devlink(dev));
- mutex_lock(&mlx5_intf_mutex);
+ mlx5_devcom_comp_lock(dev->priv.hca_devcom_comp);
for (i = ARRAY_SIZE(mlx5_adev_devices) - 1; i >= 0; i--) {
if (!priv->adev[i])
continue;
@@ -443,7 +441,7 @@ void mlx5_detach_device(struct mlx5_core_dev *dev, bool suspend)
priv->adev[i] = NULL;
}
priv->flags |= MLX5_PRIV_FLAGS_DETACH;
- mutex_unlock(&mlx5_intf_mutex);
+ mlx5_devcom_comp_unlock(dev->priv.hca_devcom_comp);
}
int mlx5_register_device(struct mlx5_core_dev *dev)
@@ -451,10 +449,10 @@ int mlx5_register_device(struct mlx5_core_dev *dev)
int ret;
devl_assert_locked(priv_to_devlink(dev));
- mutex_lock(&mlx5_intf_mutex);
+ mlx5_devcom_comp_lock(dev->priv.hca_devcom_comp);
dev->priv.flags &= ~MLX5_PRIV_FLAGS_DISABLE_ALL_ADEV;
ret = mlx5_rescan_drivers_locked(dev);
- mutex_unlock(&mlx5_intf_mutex);
+ mlx5_devcom_comp_unlock(dev->priv.hca_devcom_comp);
if (ret)
mlx5_unregister_device(dev);
@@ -464,10 +462,10 @@ int mlx5_register_device(struct mlx5_core_dev *dev)
void mlx5_unregister_device(struct mlx5_core_dev *dev)
{
devl_assert_locked(priv_to_devlink(dev));
- mutex_lock(&mlx5_intf_mutex);
+ mlx5_devcom_comp_lock(dev->priv.hca_devcom_comp);
dev->priv.flags = MLX5_PRIV_FLAGS_DISABLE_ALL_ADEV;
mlx5_rescan_drivers_locked(dev);
- mutex_unlock(&mlx5_intf_mutex);
+ mlx5_devcom_comp_unlock(dev->priv.hca_devcom_comp);
}
static int add_drivers(struct mlx5_core_dev *dev)
@@ -545,7 +543,6 @@ int mlx5_rescan_drivers_locked(struct mlx5_core_dev *dev)
{
struct mlx5_priv *priv = &dev->priv;
- lockdep_assert_held(&mlx5_intf_mutex);
if (priv->flags & MLX5_PRIV_FLAGS_DETACH)
return 0;
@@ -565,17 +562,3 @@ bool mlx5_same_hw_devs(struct mlx5_core_dev *dev, struct mlx5_core_dev *peer_dev
return (fsystem_guid && psystem_guid && fsystem_guid == psystem_guid);
}
-
-void mlx5_dev_list_lock(void)
-{
- mutex_lock(&mlx5_intf_mutex);
-}
-void mlx5_dev_list_unlock(void)
-{
- mutex_unlock(&mlx5_intf_mutex);
-}
-
-int mlx5_dev_list_trylock(void)
-{
- return mutex_trylock(&mlx5_intf_mutex);
-}
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lag/lag.c b/drivers/net/ethernet/mellanox/mlx5/core/lag/lag.c
index f0b57f97739f..d14459e5c04f 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/lag/lag.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lag/lag.c
@@ -943,6 +943,26 @@ static void mlx5_do_bond(struct mlx5_lag *ldev)
}
}
+/* The last mdev to unregister will destroy the workqueue before removing the
+ * devcom component, and as all the mdevs use the same devcom component we are
+ * guaranteed that the devcom is valid while the calling work is running.
+ */
+struct mlx5_devcom_comp_dev *mlx5_lag_get_devcom_comp(struct mlx5_lag *ldev)
+{
+ struct mlx5_devcom_comp_dev *devcom = NULL;
+ int i;
+
+ mutex_lock(&ldev->lock);
+ for (i = 0; i < ldev->ports; i++) {
+ if (ldev->pf[i].dev) {
+ devcom = ldev->pf[i].dev->priv.hca_devcom_comp;
+ break;
+ }
+ }
+ mutex_unlock(&ldev->lock);
+ return devcom;
+}
+
static void mlx5_queue_bond_work(struct mlx5_lag *ldev, unsigned long delay)
{
queue_delayed_work(ldev->wq, &ldev->bond_work, delay);
@@ -953,9 +973,14 @@ static void mlx5_do_bond_work(struct work_struct *work)
struct delayed_work *delayed_work = to_delayed_work(work);
struct mlx5_lag *ldev = container_of(delayed_work, struct mlx5_lag,
bond_work);
+ struct mlx5_devcom_comp_dev *devcom;
int status;
- status = mlx5_dev_list_trylock();
+ devcom = mlx5_lag_get_devcom_comp(ldev);
+ if (!devcom)
+ return;
+
+ status = mlx5_devcom_comp_trylock(devcom);
if (!status) {
mlx5_queue_bond_work(ldev, HZ);
return;
@@ -964,14 +989,14 @@ static void mlx5_do_bond_work(struct work_struct *work)
mutex_lock(&ldev->lock);
if (ldev->mode_changes_in_progress) {
mutex_unlock(&ldev->lock);
- mlx5_dev_list_unlock();
+ mlx5_devcom_comp_unlock(devcom);
mlx5_queue_bond_work(ldev, HZ);
return;
}
mlx5_do_bond(ldev);
mutex_unlock(&ldev->lock);
- mlx5_dev_list_unlock();
+ mlx5_devcom_comp_unlock(devcom);
}
static int mlx5_handle_changeupper_event(struct mlx5_lag *ldev,
@@ -1435,7 +1460,7 @@ void mlx5_lag_disable_change(struct mlx5_core_dev *dev)
if (!ldev)
return;
- mlx5_dev_list_lock();
+ mlx5_devcom_comp_lock(dev->priv.hca_devcom_comp);
mutex_lock(&ldev->lock);
ldev->mode_changes_in_progress++;
@@ -1443,7 +1468,7 @@ void mlx5_lag_disable_change(struct mlx5_core_dev *dev)
mlx5_disable_lag(ldev);
mutex_unlock(&ldev->lock);
- mlx5_dev_list_unlock();
+ mlx5_devcom_comp_unlock(dev->priv.hca_devcom_comp);
}
void mlx5_lag_enable_change(struct mlx5_core_dev *dev)
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lag/lag.h b/drivers/net/ethernet/mellanox/mlx5/core/lag/lag.h
index 481e92f39fe6..50fcb1eee574 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/lag/lag.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lag/lag.h
@@ -112,6 +112,7 @@ void mlx5_disable_lag(struct mlx5_lag *ldev);
void mlx5_lag_remove_devices(struct mlx5_lag *ldev);
int mlx5_deactivate_lag(struct mlx5_lag *ldev);
void mlx5_lag_add_devices(struct mlx5_lag *ldev);
+struct mlx5_devcom_comp_dev *mlx5_lag_get_devcom_comp(struct mlx5_lag *ldev);
static inline bool mlx5_lag_is_supported(struct mlx5_core_dev *dev)
{
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lag/mpesw.c b/drivers/net/ethernet/mellanox/mlx5/core/lag/mpesw.c
index 0857eebf4f07..82889f30506e 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/lag/mpesw.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lag/mpesw.c
@@ -129,9 +129,14 @@ static void disable_mpesw(struct mlx5_lag *ldev)
static void mlx5_mpesw_work(struct work_struct *work)
{
struct mlx5_mpesw_work_st *mpesww = container_of(work, struct mlx5_mpesw_work_st, work);
+ struct mlx5_devcom_comp_dev *devcom;
struct mlx5_lag *ldev = mpesww->lag;
- mlx5_dev_list_lock();
+ devcom = mlx5_lag_get_devcom_comp(ldev);
+ if (!devcom)
+ return;
+
+ mlx5_devcom_comp_lock(devcom);
mutex_lock(&ldev->lock);
if (ldev->mode_changes_in_progress) {
mpesww->result = -EAGAIN;
@@ -144,7 +149,7 @@ static void mlx5_mpesw_work(struct work_struct *work)
disable_mpesw(ldev);
unlock:
mutex_unlock(&ldev->lock);
- mlx5_dev_list_unlock();
+ mlx5_devcom_comp_unlock(devcom);
complete(&mpesww->comp);
}
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/devcom.c b/drivers/net/ethernet/mellanox/mlx5/core/lib/devcom.c
index f4d5c300ddd6..e8e50563e956 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/lib/devcom.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/devcom.c
@@ -401,3 +401,10 @@ void mlx5_devcom_comp_unlock(struct mlx5_devcom_comp_dev *devcom)
return;
up_write(&devcom->comp->sem);
}
+
+int mlx5_devcom_comp_trylock(struct mlx5_devcom_comp_dev *devcom)
+{
+ if (IS_ERR_OR_NULL(devcom))
+ return 0;
+ return down_write_trylock(&devcom->comp->sem);
+}
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/devcom.h b/drivers/net/ethernet/mellanox/mlx5/core/lib/devcom.h
index ed249bafd07c..1549edd19aa8 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/lib/devcom.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/devcom.h
@@ -54,5 +54,6 @@ void *mlx5_devcom_get_next_peer_data_rcu(struct mlx5_devcom_comp_dev *devcom,
void mlx5_devcom_comp_lock(struct mlx5_devcom_comp_dev *devcom);
void mlx5_devcom_comp_unlock(struct mlx5_devcom_comp_dev *devcom);
+int mlx5_devcom_comp_trylock(struct mlx5_devcom_comp_dev *devcom);
#endif /* __LIB_MLX5_DEVCOM_H__ */
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.h b/drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.h
index bbc96aa6cbcc..0b60b02518c1 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.h
@@ -41,6 +41,7 @@
#include <linux/mlx5/cq.h>
#include <linux/mlx5/fs.h>
#include <linux/mlx5/driver.h>
+#include "lib/devcom.h"
extern uint mlx5_core_debug_mask;
@@ -250,9 +251,6 @@ int mlx5_register_device(struct mlx5_core_dev *dev);
void mlx5_unregister_device(struct mlx5_core_dev *dev);
void mlx5_dev_set_lightweight(struct mlx5_core_dev *dev);
bool mlx5_dev_is_lightweight(struct mlx5_core_dev *dev);
-void mlx5_dev_list_lock(void);
-void mlx5_dev_list_unlock(void);
-int mlx5_dev_list_trylock(void);
void mlx5_fw_reporters_create(struct mlx5_core_dev *dev);
int mlx5_query_mtpps(struct mlx5_core_dev *dev, u32 *mtpps, u32 mtpps_size);
@@ -291,9 +289,9 @@ static inline int mlx5_rescan_drivers(struct mlx5_core_dev *dev)
{
int ret;
- mlx5_dev_list_lock();
+ mlx5_devcom_comp_lock(dev->priv.hca_devcom_comp);
ret = mlx5_rescan_drivers_locked(dev);
- mlx5_dev_list_unlock();
+ mlx5_devcom_comp_unlock(dev->priv.hca_devcom_comp);
return ret;
}
--
2.41.0
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