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// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
// Copyright (c) 2019 Mellanox Technologies
#include <linux/mlx5/driver.h>
#include <linux/mlx5/device.h>
#include "mlx5_core.h"
#include "lib/mlx5.h"
struct mlx5_dm {
/* protect access to icm bitmask */
spinlock_t lock;
unsigned long *steering_sw_icm_alloc_blocks;
unsigned long *header_modify_sw_icm_alloc_blocks;
};
struct mlx5_dm *mlx5_dm_create(struct mlx5_core_dev *dev)
{
u64 header_modify_icm_blocks = 0;
u64 steering_icm_blocks = 0;
struct mlx5_dm *dm;
if (!(MLX5_CAP_GEN_64(dev, general_obj_types) & MLX5_GENERAL_OBJ_TYPES_CAP_SW_ICM))
return NULL;
dm = kzalloc(sizeof(*dm), GFP_KERNEL);
if (!dm)
return ERR_PTR(-ENOMEM);
spin_lock_init(&dm->lock);
if (MLX5_CAP64_DEV_MEM(dev, steering_sw_icm_start_address)) {
steering_icm_blocks =
BIT(MLX5_CAP_DEV_MEM(dev, log_steering_sw_icm_size) -
MLX5_LOG_SW_ICM_BLOCK_SIZE(dev));
dm->steering_sw_icm_alloc_blocks =
kcalloc(BITS_TO_LONGS(steering_icm_blocks),
sizeof(unsigned long), GFP_KERNEL);
if (!dm->steering_sw_icm_alloc_blocks)
goto err_steering;
}
if (MLX5_CAP64_DEV_MEM(dev, header_modify_sw_icm_start_address)) {
header_modify_icm_blocks =
BIT(MLX5_CAP_DEV_MEM(dev, log_header_modify_sw_icm_size) -
MLX5_LOG_SW_ICM_BLOCK_SIZE(dev));
dm->header_modify_sw_icm_alloc_blocks =
kcalloc(BITS_TO_LONGS(header_modify_icm_blocks),
sizeof(unsigned long), GFP_KERNEL);
if (!dm->header_modify_sw_icm_alloc_blocks)
goto err_modify_hdr;
}
return dm;
err_modify_hdr:
kfree(dm->steering_sw_icm_alloc_blocks);
err_steering:
kfree(dm);
return ERR_PTR(-ENOMEM);
}
void mlx5_dm_cleanup(struct mlx5_core_dev *dev)
{
struct mlx5_dm *dm = dev->dm;
if (!dev->dm)
return;
if (dm->steering_sw_icm_alloc_blocks) {
WARN_ON(!bitmap_empty(dm->steering_sw_icm_alloc_blocks,
BIT(MLX5_CAP_DEV_MEM(dev, log_steering_sw_icm_size) -
MLX5_LOG_SW_ICM_BLOCK_SIZE(dev))));
kfree(dm->steering_sw_icm_alloc_blocks);
}
if (dm->header_modify_sw_icm_alloc_blocks) {
WARN_ON(!bitmap_empty(dm->header_modify_sw_icm_alloc_blocks,
BIT(MLX5_CAP_DEV_MEM(dev,
log_header_modify_sw_icm_size) -
MLX5_LOG_SW_ICM_BLOCK_SIZE(dev))));
kfree(dm->header_modify_sw_icm_alloc_blocks);
}
kfree(dm);
}
int mlx5_dm_sw_icm_alloc(struct mlx5_core_dev *dev, enum mlx5_sw_icm_type type,
u64 length, u16 uid, phys_addr_t *addr, u32 *obj_id)
{
u32 num_blocks = DIV_ROUND_UP_ULL(length, MLX5_SW_ICM_BLOCK_SIZE(dev));
u32 out[MLX5_ST_SZ_DW(general_obj_out_cmd_hdr)] = {};
u32 in[MLX5_ST_SZ_DW(create_sw_icm_in)] = {};
struct mlx5_dm *dm = dev->dm;
unsigned long *block_map;
u64 icm_start_addr;
u32 log_icm_size;
u32 max_blocks;
u64 block_idx;
void *sw_icm;
int ret;
if (!dev->dm)
return -EOPNOTSUPP;
if (!length || (length & (length - 1)) ||
length & (MLX5_SW_ICM_BLOCK_SIZE(dev) - 1))
return -EINVAL;
MLX5_SET(general_obj_in_cmd_hdr, in, opcode,
MLX5_CMD_OP_CREATE_GENERAL_OBJECT);
MLX5_SET(general_obj_in_cmd_hdr, in, obj_type, MLX5_OBJ_TYPE_SW_ICM);
MLX5_SET(general_obj_in_cmd_hdr, in, uid, uid);
switch (type) {
case MLX5_SW_ICM_TYPE_STEERING:
icm_start_addr = MLX5_CAP64_DEV_MEM(dev, steering_sw_icm_start_address);
log_icm_size = MLX5_CAP_DEV_MEM(dev, log_steering_sw_icm_size);
block_map = dm->steering_sw_icm_alloc_blocks;
break;
case MLX5_SW_ICM_TYPE_HEADER_MODIFY:
icm_start_addr = MLX5_CAP64_DEV_MEM(dev, header_modify_sw_icm_start_address);
log_icm_size = MLX5_CAP_DEV_MEM(dev,
log_header_modify_sw_icm_size);
block_map = dm->header_modify_sw_icm_alloc_blocks;
break;
default:
return -EINVAL;
}
if (!block_map)
return -EOPNOTSUPP;
max_blocks = BIT(log_icm_size - MLX5_LOG_SW_ICM_BLOCK_SIZE(dev));
spin_lock(&dm->lock);
block_idx = bitmap_find_next_zero_area(block_map,
max_blocks,
0,
num_blocks, 0);
if (block_idx < max_blocks)
bitmap_set(block_map,
block_idx, num_blocks);
spin_unlock(&dm->lock);
if (block_idx >= max_blocks)
return -ENOMEM;
sw_icm = MLX5_ADDR_OF(create_sw_icm_in, in, sw_icm);
icm_start_addr += block_idx << MLX5_LOG_SW_ICM_BLOCK_SIZE(dev);
MLX5_SET64(sw_icm, sw_icm, sw_icm_start_addr,
icm_start_addr);
MLX5_SET(sw_icm, sw_icm, log_sw_icm_size, ilog2(length));
ret = mlx5_cmd_exec(dev, in, sizeof(in), out, sizeof(out));
if (ret) {
spin_lock(&dm->lock);
bitmap_clear(block_map,
block_idx, num_blocks);
spin_unlock(&dm->lock);
return ret;
}
*addr = icm_start_addr;
*obj_id = MLX5_GET(general_obj_out_cmd_hdr, out, obj_id);
return 0;
}
EXPORT_SYMBOL_GPL(mlx5_dm_sw_icm_alloc);
int mlx5_dm_sw_icm_dealloc(struct mlx5_core_dev *dev, enum mlx5_sw_icm_type type,
u64 length, u16 uid, phys_addr_t addr, u32 obj_id)
{
u32 num_blocks = DIV_ROUND_UP_ULL(length, MLX5_SW_ICM_BLOCK_SIZE(dev));
u32 out[MLX5_ST_SZ_DW(general_obj_out_cmd_hdr)] = {};
u32 in[MLX5_ST_SZ_DW(general_obj_in_cmd_hdr)] = {};
struct mlx5_dm *dm = dev->dm;
unsigned long *block_map;
u64 icm_start_addr;
u64 start_idx;
int err;
if (!dev->dm)
return -EOPNOTSUPP;
switch (type) {
case MLX5_SW_ICM_TYPE_STEERING:
icm_start_addr = MLX5_CAP64_DEV_MEM(dev, steering_sw_icm_start_address);
block_map = dm->steering_sw_icm_alloc_blocks;
break;
case MLX5_SW_ICM_TYPE_HEADER_MODIFY:
icm_start_addr = MLX5_CAP64_DEV_MEM(dev, header_modify_sw_icm_start_address);
block_map = dm->header_modify_sw_icm_alloc_blocks;
break;
default:
return -EINVAL;
}
MLX5_SET(general_obj_in_cmd_hdr, in, opcode,
MLX5_CMD_OP_DESTROY_GENERAL_OBJECT);
MLX5_SET(general_obj_in_cmd_hdr, in, obj_type, MLX5_OBJ_TYPE_SW_ICM);
MLX5_SET(general_obj_in_cmd_hdr, in, obj_id, obj_id);
MLX5_SET(general_obj_in_cmd_hdr, in, uid, uid);
err = mlx5_cmd_exec(dev, in, sizeof(in), out, sizeof(out));
if (err)
return err;
start_idx = (addr - icm_start_addr) >> MLX5_LOG_SW_ICM_BLOCK_SIZE(dev);
spin_lock(&dm->lock);
bitmap_clear(block_map,
start_idx, num_blocks);
spin_unlock(&dm->lock);
return 0;
}
EXPORT_SYMBOL_GPL(mlx5_dm_sw_icm_dealloc);
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