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Date: Mon, 18 Apr 2022 09:42:32 +0300
From: Ido Schimmel <idosch@...dia.com>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
jiri@...dia.com, vadimp@...dia.com, petrm@...dia.com,
andrew@...n.ch, dsahern@...il.com, mlxsw@...dia.com,
Ido Schimmel <idosch@...dia.com>
Subject: [PATCH net-next 08/17] mlxsw: Narrow the critical section of devl_lock during ports creation/removal
From: Jiri Pirko <jiri@...dia.com>
No need to hold the lock for alloc and freecpu. So narrow the critical
section. Follow-up patch is going to benefit from this by adding more
code to the functions which will be out of the critical as well.
Signed-off-by: Jiri Pirko <jiri@...dia.com>
Signed-off-by: Ido Schimmel <idosch@...dia.com>
---
drivers/net/ethernet/mellanox/mlxsw/minimal.c | 13 +++++++------
drivers/net/ethernet/mellanox/mlxsw/spectrum.c | 14 +++++++-------
2 files changed, 14 insertions(+), 13 deletions(-)
diff --git a/drivers/net/ethernet/mellanox/mlxsw/minimal.c b/drivers/net/ethernet/mellanox/mlxsw/minimal.c
index eb906b73b4e2..ee1cb1b81669 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/minimal.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/minimal.c
@@ -328,6 +328,7 @@ static void mlxsw_m_port_module_unmap(struct mlxsw_m *mlxsw_m, u8 module)
static int mlxsw_m_ports_create(struct mlxsw_m *mlxsw_m)
{
unsigned int max_ports = mlxsw_core_max_ports(mlxsw_m->core);
+ struct devlink *devlink = priv_to_devlink(mlxsw_m->core);
u8 last_module = max_ports;
int i;
int err;
@@ -356,6 +357,7 @@ static int mlxsw_m_ports_create(struct mlxsw_m *mlxsw_m)
}
/* Create port objects for each valid entry */
+ devl_lock(devlink);
for (i = 0; i < mlxsw_m->max_ports; i++) {
if (mlxsw_m->module_to_port[i] > 0 &&
!mlxsw_core_port_is_xm(mlxsw_m->core, i)) {
@@ -366,6 +368,7 @@ static int mlxsw_m_ports_create(struct mlxsw_m *mlxsw_m)
goto err_module_to_port_create;
}
}
+ devl_unlock(devlink);
return 0;
@@ -375,6 +378,7 @@ static int mlxsw_m_ports_create(struct mlxsw_m *mlxsw_m)
mlxsw_m_port_remove(mlxsw_m,
mlxsw_m->module_to_port[i]);
}
+ devl_unlock(devlink);
i = max_ports;
err_module_to_port_map:
for (i--; i > 0; i--)
@@ -387,8 +391,10 @@ static int mlxsw_m_ports_create(struct mlxsw_m *mlxsw_m)
static void mlxsw_m_ports_remove(struct mlxsw_m *mlxsw_m)
{
+ struct devlink *devlink = priv_to_devlink(mlxsw_m->core);
int i;
+ devl_lock(devlink);
for (i = 0; i < mlxsw_m->max_ports; i++) {
if (mlxsw_m->module_to_port[i] > 0) {
mlxsw_m_port_remove(mlxsw_m,
@@ -396,6 +402,7 @@ static void mlxsw_m_ports_remove(struct mlxsw_m *mlxsw_m)
mlxsw_m_port_module_unmap(mlxsw_m, i);
}
}
+ devl_unlock(devlink);
kfree(mlxsw_m->module_to_port);
kfree(mlxsw_m->ports);
@@ -424,7 +431,6 @@ static int mlxsw_m_init(struct mlxsw_core *mlxsw_core,
struct netlink_ext_ack *extack)
{
struct mlxsw_m *mlxsw_m = mlxsw_core_driver_priv(mlxsw_core);
- struct devlink *devlink = priv_to_devlink(mlxsw_core);
int err;
mlxsw_m->core = mlxsw_core;
@@ -440,9 +446,7 @@ static int mlxsw_m_init(struct mlxsw_core *mlxsw_core,
return err;
}
- devl_lock(devlink);
err = mlxsw_m_ports_create(mlxsw_m);
- devl_unlock(devlink);
if (err) {
dev_err(mlxsw_m->bus_info->dev, "Failed to create ports\n");
return err;
@@ -454,11 +458,8 @@ static int mlxsw_m_init(struct mlxsw_core *mlxsw_core,
static void mlxsw_m_fini(struct mlxsw_core *mlxsw_core)
{
struct mlxsw_m *mlxsw_m = mlxsw_core_driver_priv(mlxsw_core);
- struct devlink *devlink = priv_to_devlink(mlxsw_core);
- devl_lock(devlink);
mlxsw_m_ports_remove(mlxsw_m);
- devl_unlock(devlink);
}
static const struct mlxsw_config_profile mlxsw_m_config_profile;
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
index 55b97ccafd45..c26c160744d0 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
@@ -1863,12 +1863,15 @@ static bool mlxsw_sp_port_created(struct mlxsw_sp *mlxsw_sp, u16 local_port)
static void mlxsw_sp_ports_remove(struct mlxsw_sp *mlxsw_sp)
{
+ struct devlink *devlink = priv_to_devlink(mlxsw_sp->core);
int i;
+ devl_lock(devlink);
for (i = 1; i < mlxsw_core_max_ports(mlxsw_sp->core); i++)
if (mlxsw_sp_port_created(mlxsw_sp, i))
mlxsw_sp_port_remove(mlxsw_sp, i);
mlxsw_sp_cpu_port_remove(mlxsw_sp);
+ devl_unlock(devlink);
kfree(mlxsw_sp->ports);
mlxsw_sp->ports = NULL;
}
@@ -1876,6 +1879,7 @@ static void mlxsw_sp_ports_remove(struct mlxsw_sp *mlxsw_sp)
static int mlxsw_sp_ports_create(struct mlxsw_sp *mlxsw_sp)
{
unsigned int max_ports = mlxsw_core_max_ports(mlxsw_sp->core);
+ struct devlink *devlink = priv_to_devlink(mlxsw_sp->core);
struct mlxsw_sp_port_mapping *port_mapping;
size_t alloc_size;
int i;
@@ -1886,6 +1890,7 @@ static int mlxsw_sp_ports_create(struct mlxsw_sp *mlxsw_sp)
if (!mlxsw_sp->ports)
return -ENOMEM;
+ devl_lock(devlink);
err = mlxsw_sp_cpu_port_create(mlxsw_sp);
if (err)
goto err_cpu_port_create;
@@ -1898,6 +1903,7 @@ static int mlxsw_sp_ports_create(struct mlxsw_sp *mlxsw_sp)
if (err)
goto err_port_create;
}
+ devl_unlock(devlink);
return 0;
err_port_create:
@@ -1906,6 +1912,7 @@ static int mlxsw_sp_ports_create(struct mlxsw_sp *mlxsw_sp)
mlxsw_sp_port_remove(mlxsw_sp, i);
mlxsw_sp_cpu_port_remove(mlxsw_sp);
err_cpu_port_create:
+ devl_unlock(devlink);
kfree(mlxsw_sp->ports);
mlxsw_sp->ports = NULL;
return err;
@@ -2805,7 +2812,6 @@ static int mlxsw_sp_init(struct mlxsw_core *mlxsw_core,
struct netlink_ext_ack *extack)
{
struct mlxsw_sp *mlxsw_sp = mlxsw_core_driver_priv(mlxsw_core);
- struct devlink *devlink = priv_to_devlink(mlxsw_core);
int err;
mlxsw_sp->core = mlxsw_core;
@@ -2966,9 +2972,7 @@ static int mlxsw_sp_init(struct mlxsw_core *mlxsw_core,
goto err_sample_trigger_init;
}
- devl_lock(devlink);
err = mlxsw_sp_ports_create(mlxsw_sp);
- devl_unlock(devlink);
if (err) {
dev_err(mlxsw_sp->bus_info->dev, "Failed to create ports\n");
goto err_ports_create;
@@ -3149,12 +3153,8 @@ static int mlxsw_sp4_init(struct mlxsw_core *mlxsw_core,
static void mlxsw_sp_fini(struct mlxsw_core *mlxsw_core)
{
struct mlxsw_sp *mlxsw_sp = mlxsw_core_driver_priv(mlxsw_core);
- struct devlink *devlink = priv_to_devlink(mlxsw_core);
- devl_lock(devlink);
mlxsw_sp_ports_remove(mlxsw_sp);
- devl_unlock(devlink);
-
rhashtable_destroy(&mlxsw_sp->sample_trigger_ht);
mlxsw_sp_port_module_info_fini(mlxsw_sp);
mlxsw_sp_dpipe_fini(mlxsw_sp);
--
2.33.1
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