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net/mlx5: Let user configure io_eq_size param 

Currently, each I/O EQ is taking 128KB of memory. This size
is not needed in all use cases, and is critical with large scale.
Hence, allow user to configure the size of I/O EQs.

For example, to reduce I/O EQ size to 64, execute:
$ devlink dev param set pci/0000:00:0b.0 name io_eq_size value 64 \
              cmode driverinit
$ devlink dev reload pci/0000:00:0b.0

Signed-off-by: Shay Drory <shayd@nvidia.com>
Reviewed-by: Moshe Shemesh <moshe@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
This commit is contained in:
Shay Drory 2021-12-09 12:09:25 +02:00 committed by Saeed Mahameed
parent 47402385d0
commit 0844fa5f7b
3 changed files with 35 additions and 1 deletions
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4
Documentation/networking/devlink/mlx5.rst
View File

@ -14,8 +14,12 @@ Parameters
* - Name
- Mode
- Validation
* - ``enable_roce``
- driverinit
* - ``io_eq_size``
- driverinit
- The range is between 64 and 4096.
The ``mlx5`` driver also implements the following driver-specific
parameters.

14
drivers/net/ethernet/mellanox/mlx5/core/devlink.c
View File

@ -546,6 +546,13 @@ static int mlx5_devlink_enable_remote_dev_reset_get(struct devlink *devlink, u32
return 0;
}
static int mlx5_devlink_eq_depth_validate(struct devlink *devlink, u32 id,
union devlink_param_value val,
struct netlink_ext_ack *extack)
{
return (val.vu16 >= 64 && val.vu16 <= 4096) ? 0 : -EINVAL;
}
static const struct devlink_param mlx5_devlink_params[] = {
DEVLINK_PARAM_DRIVER(MLX5_DEVLINK_PARAM_ID_FLOW_STEERING_MODE,
"flow_steering_mode", DEVLINK_PARAM_TYPE_STRING,
@ -570,6 +577,8 @@ static const struct devlink_param mlx5_devlink_params[] = {
DEVLINK_PARAM_GENERIC(ENABLE_REMOTE_DEV_RESET, BIT(DEVLINK_PARAM_CMODE_RUNTIME),
mlx5_devlink_enable_remote_dev_reset_get,
mlx5_devlink_enable_remote_dev_reset_set, NULL),
DEVLINK_PARAM_GENERIC(IO_EQ_SIZE, BIT(DEVLINK_PARAM_CMODE_DRIVERINIT),
NULL, NULL, mlx5_devlink_eq_depth_validate),
};
static void mlx5_devlink_set_params_init_values(struct devlink *devlink)
@ -608,6 +617,11 @@ static void mlx5_devlink_set_params_init_values(struct devlink *devlink)
value);
}
#endif
value.vu32 = MLX5_COMP_EQ_SIZE;
devlink_param_driverinit_value_set(devlink,
DEVLINK_PARAM_GENERIC_ID_IO_EQ_SIZE,
value);
}
static const struct devlink_param enable_eth_param =

18
drivers/net/ethernet/mellanox/mlx5/core/eq.c
View File

@ -19,6 +19,7 @@
#include "lib/clock.h"
#include "diag/fw_tracer.h"
#include "mlx5_irq.h"
#include "devlink.h"
enum {
MLX5_EQE_OWNER_INIT_VAL = 0x1,
@ -796,6 +797,21 @@ static void destroy_comp_eqs(struct mlx5_core_dev *dev)
}
}
static u16 comp_eq_depth_devlink_param_get(struct mlx5_core_dev *dev)
{
struct devlink *devlink = priv_to_devlink(dev);
union devlink_param_value val;
int err;
err = devlink_param_driverinit_value_get(devlink,
DEVLINK_PARAM_GENERIC_ID_IO_EQ_SIZE,
&val);
if (!err)
return val.vu32;
mlx5_core_dbg(dev, "Failed to get param. using default. err = %d\n", err);
return MLX5_COMP_EQ_SIZE;
}
static int create_comp_eqs(struct mlx5_core_dev *dev)
{
struct mlx5_eq_table *table = dev->priv.eq_table;
@ -807,7 +823,7 @@ static int create_comp_eqs(struct mlx5_core_dev *dev)
INIT_LIST_HEAD(&table->comp_eqs_list);
ncomp_eqs = table->num_comp_eqs;
nent = MLX5_COMP_EQ_SIZE;
nent = comp_eq_depth_devlink_param_get(dev);
for (i = 0; i < ncomp_eqs; i++) {
struct mlx5_eq_param param = {};
int vecidx = i;