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net/mlx5: SD, Implement basic query and instantiation

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Add implementation for querying the MPIR register for Socket-Direct
attributes, and instantiating a SD struct accordingly.

Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
This commit is contained in:
Tariq Toukan 2024-02-14 19:08:02 -08:00 committed by Saeed Mahameed
parent 75a543962e
commit 678eb44805
1 changed files with 109 additions and 1 deletions
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110
drivers/net/ethernet/mellanox/mlx5/core/lib/sd.c
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@ -3,6 +3,8 @@
#include "lib/sd.h"
#include "mlx5_core.h"
#include "lib/mlx5.h"
#include <linux/mlx5/vport.h>
#define sd_info(__dev, format, ...) \
dev_info((__dev)->device, "Socket-Direct: " format, ##__VA_ARGS__)
@ -10,11 +12,18 @@
dev_warn((__dev)->device, "Socket-Direct: " format, ##__VA_ARGS__)
struct mlx5_sd {
u32 group_id;
u8 host_buses;
};
static int mlx5_sd_get_host_buses(struct mlx5_core_dev *dev)
{
return 1;
struct mlx5_sd *sd = mlx5_get_sd(dev);
if (!sd)
return 1;
return sd->host_buses;
}
struct mlx5_core_dev *
@ -43,13 +52,112 @@ struct mlx5_core_dev *mlx5_sd_ch_ix_get_dev(struct mlx5_core_dev *primary, int c
return mlx5_sd_primary_get_peer(primary, mdev_idx);
}
static bool mlx5_sd_is_supported(struct mlx5_core_dev *dev, u8 host_buses)
{
/* Feature is currently implemented for PFs only */
if (!mlx5_core_is_pf(dev))
return false;
/* Honor the SW implementation limit */
if (host_buses > MLX5_SD_MAX_GROUP_SZ)
return false;
return true;
}
static int mlx5_query_sd(struct mlx5_core_dev *dev, bool *sdm,
u8 *host_buses, u8 *sd_group)
{
u32 out[MLX5_ST_SZ_DW(mpir_reg)];
int err;
err = mlx5_query_mpir_reg(dev, out);
if (err)
return err;
err = mlx5_query_nic_vport_sd_group(dev, sd_group);
if (err)
return err;
*sdm = MLX5_GET(mpir_reg, out, sdm);
*host_buses = MLX5_GET(mpir_reg, out, host_buses);
return 0;
}
static u32 mlx5_sd_group_id(struct mlx5_core_dev *dev, u8 sd_group)
{
return (u32)((MLX5_CAP_GEN(dev, native_port_num) << 8) | sd_group);
}
static int sd_init(struct mlx5_core_dev *dev)
{
u8 host_buses, sd_group;
struct mlx5_sd *sd;
u32 group_id;
bool sdm;
int err;
if (!MLX5_CAP_MCAM_REG(dev, mpir))
return 0;
err = mlx5_query_sd(dev, &sdm, &host_buses, &sd_group);
if (err)
return err;
if (!sdm)
return 0;
if (!sd_group)
return 0;
group_id = mlx5_sd_group_id(dev, sd_group);
if (!mlx5_sd_is_supported(dev, host_buses)) {
sd_warn(dev, "can't support requested netdev combining for group id 0x%x), skipping\n",
group_id);
return 0;
}
sd = kzalloc(sizeof(*sd), GFP_KERNEL);
if (!sd)
return -ENOMEM;
sd->host_buses = host_buses;
sd->group_id = group_id;
mlx5_set_sd(dev, sd);
return 0;
}
static void sd_cleanup(struct mlx5_core_dev *dev)
{
struct mlx5_sd *sd = mlx5_get_sd(dev);
mlx5_set_sd(dev, NULL);
kfree(sd);
}
int mlx5_sd_init(struct mlx5_core_dev *dev)
{
int err;
err = sd_init(dev);
if (err)
return err;
return 0;
}
void mlx5_sd_cleanup(struct mlx5_core_dev *dev)
{
struct mlx5_sd *sd = mlx5_get_sd(dev);
if (!sd)
return;
sd_cleanup(dev);
}
struct auxiliary_device *mlx5_sd_get_adev(struct mlx5_core_dev *dev,