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/*
* Copyright (c) 2017, Mellanox Technologies. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <linux/etherdevice.h>
#include <linux/mlx5/driver.h>
#include <linux/mlx5/mlx5_ifc.h>
#include <linux/mlx5/eswitch.h>
#include "mlx5_core.h"
#include "lib/mpfs.h"
/* HW L2 Table (MPFS) management */
static int set_l2table_entry_cmd(struct mlx5_core_dev *dev, u32 index, u8 *mac)
{
u32 in[MLX5_ST_SZ_DW(set_l2_table_entry_in)] = {0};
u32 out[MLX5_ST_SZ_DW(set_l2_table_entry_out)] = {0};
u8 *in_mac_addr;
MLX5_SET(set_l2_table_entry_in, in, opcode, MLX5_CMD_OP_SET_L2_TABLE_ENTRY);
MLX5_SET(set_l2_table_entry_in, in, table_index, index);
in_mac_addr = MLX5_ADDR_OF(set_l2_table_entry_in, in, mac_address);
ether_addr_copy(&in_mac_addr[2], mac);
return mlx5_cmd_exec(dev, in, sizeof(in), out, sizeof(out));
}
static int del_l2table_entry_cmd(struct mlx5_core_dev *dev, u32 index)
{
u32 in[MLX5_ST_SZ_DW(delete_l2_table_entry_in)] = {0};
u32 out[MLX5_ST_SZ_DW(delete_l2_table_entry_out)] = {0};
MLX5_SET(delete_l2_table_entry_in, in, opcode, MLX5_CMD_OP_DELETE_L2_TABLE_ENTRY);
MLX5_SET(delete_l2_table_entry_in, in, table_index, index);
return mlx5_cmd_exec(dev, in, sizeof(in), out, sizeof(out));
}
/* UC L2 table hash node */
struct l2table_node {
struct l2addr_node node;
u32 index; /* index in HW l2 table */
};
struct mlx5_mpfs {
struct hlist_head hash[MLX5_L2_ADDR_HASH_SIZE];
struct mutex lock; /* Synchronize l2 table access */
u32 size;
unsigned long *bitmap;
};
static int alloc_l2table_index(struct mlx5_mpfs *l2table, u32 *ix)
{
int err = 0;
*ix = find_first_zero_bit(l2table->bitmap, l2table->size);
if (*ix >= l2table->size)
err = -ENOSPC;
else
__set_bit(*ix, l2table->bitmap);
return err;
}
static void free_l2table_index(struct mlx5_mpfs *l2table, u32 ix)
{
__clear_bit(ix, l2table->bitmap);
}
int mlx5_mpfs_init(struct mlx5_core_dev *dev)
{
int l2table_size = 1 << MLX5_CAP_GEN(dev, log_max_l2_table);
struct mlx5_mpfs *mpfs;
if (!MLX5_ESWITCH_MANAGER(dev))
return 0;
mpfs = kzalloc(sizeof(*mpfs), GFP_KERNEL);
if (!mpfs)
return -ENOMEM;
mutex_init(&mpfs->lock);
mpfs->size = l2table_size;
mpfs->bitmap = kcalloc(BITS_TO_LONGS(l2table_size),
sizeof(uintptr_t), GFP_KERNEL);
if (!mpfs->bitmap) {
kfree(mpfs);
return -ENOMEM;
}
dev->priv.mpfs = mpfs;
return 0;
}
void mlx5_mpfs_cleanup(struct mlx5_core_dev *dev)
{
struct mlx5_mpfs *mpfs = dev->priv.mpfs;
if (!MLX5_ESWITCH_MANAGER(dev))
return;
WARN_ON(!hlist_empty(mpfs->hash));
kfree(mpfs->bitmap);
kfree(mpfs);
}
int mlx5_mpfs_add_mac(struct mlx5_core_dev *dev, u8 *mac)
{
struct mlx5_mpfs *mpfs = dev->priv.mpfs;
struct l2table_node *l2addr;
u32 index;
int err;
if (!MLX5_ESWITCH_MANAGER(dev))
return 0;
mutex_lock(&mpfs->lock);
l2addr = l2addr_hash_find(mpfs->hash, mac, struct l2table_node);
if (l2addr) {
err = -EEXIST;
goto abort;
}
err = alloc_l2table_index(mpfs, &index);
if (err)
goto abort;
l2addr = l2addr_hash_add(mpfs->hash, mac, struct l2table_node, GFP_KERNEL);
if (!l2addr) {
free_l2table_index(mpfs, index);
err = -ENOMEM;
goto abort;
}
l2addr->index = index;
err = set_l2table_entry_cmd(dev, index, mac);
if (err) {
l2addr_hash_del(l2addr);
free_l2table_index(mpfs, index);
}
mlx5_core_dbg(dev, "MPFS mac added %pM, index (%d)\n", mac, index);
abort:
mutex_unlock(&mpfs->lock);
return err;
}
int mlx5_mpfs_del_mac(struct mlx5_core_dev *dev, u8 *mac)
{
struct mlx5_mpfs *mpfs = dev->priv.mpfs;
struct l2table_node *l2addr;
int err = 0;
u32 index;
if (!MLX5_ESWITCH_MANAGER(dev))
return 0;
mutex_lock(&mpfs->lock);
l2addr = l2addr_hash_find(mpfs->hash, mac, struct l2table_node);
if (!l2addr) {
err = -ENOENT;
goto unlock;
}
index = l2addr->index;
del_l2table_entry_cmd(dev, index);
l2addr_hash_del(l2addr);
free_l2table_index(mpfs, index);
mlx5_core_dbg(dev, "MPFS mac deleted %pM, index (%d)\n", mac, index);
unlock:
mutex_unlock(&mpfs->lock);
return err;
}
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