/*
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* Copyright (c) 2017, Mellanox Technologies. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <linux/etherdevice.h>
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#include <linux/mlx5/driver.h>
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#include <linux/mlx5/mlx5_ifc.h>
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#include <linux/mlx5/mpfs.h>
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#include <linux/mlx5/eswitch.h>
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#include "mlx5_core.h"
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#include "lib/mpfs.h"
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/* HW L2 Table (MPFS) management */
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static int set_l2table_entry_cmd(struct mlx5_core_dev *dev, u32 index, u8 *mac)
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{
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u32 in[MLX5_ST_SZ_DW(set_l2_table_entry_in)] = {};
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u8 *in_mac_addr;
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MLX5_SET(set_l2_table_entry_in, in, opcode, MLX5_CMD_OP_SET_L2_TABLE_ENTRY);
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MLX5_SET(set_l2_table_entry_in, in, table_index, index);
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in_mac_addr = MLX5_ADDR_OF(set_l2_table_entry_in, in, mac_address);
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ether_addr_copy(&in_mac_addr[2], mac);
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return mlx5_cmd_exec_in(dev, set_l2_table_entry, in);
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}
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static int del_l2table_entry_cmd(struct mlx5_core_dev *dev, u32 index)
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{
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u32 in[MLX5_ST_SZ_DW(delete_l2_table_entry_in)] = {};
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MLX5_SET(delete_l2_table_entry_in, in, opcode, MLX5_CMD_OP_DELETE_L2_TABLE_ENTRY);
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MLX5_SET(delete_l2_table_entry_in, in, table_index, index);
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return mlx5_cmd_exec_in(dev, delete_l2_table_entry, in);
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}
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/* UC L2 table hash node */
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struct l2table_node {
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struct l2addr_node node;
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u32 index; /* index in HW l2 table */
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int ref_count;
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};
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struct mlx5_mpfs {
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struct hlist_head hash[MLX5_L2_ADDR_HASH_SIZE];
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struct mutex lock; /* Synchronize l2 table access */
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u32 size;
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unsigned long *bitmap;
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};
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static int alloc_l2table_index(struct mlx5_mpfs *l2table, u32 *ix)
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{
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int err = 0;
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*ix = find_first_zero_bit(l2table->bitmap, l2table->size);
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if (*ix >= l2table->size)
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err = -ENOSPC;
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else
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__set_bit(*ix, l2table->bitmap);
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return err;
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}
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static void free_l2table_index(struct mlx5_mpfs *l2table, u32 ix)
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{
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__clear_bit(ix, l2table->bitmap);
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}
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int mlx5_mpfs_init(struct mlx5_core_dev *dev)
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{
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int l2table_size = 1 << MLX5_CAP_GEN(dev, log_max_l2_table);
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struct mlx5_mpfs *mpfs;
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if (!MLX5_ESWITCH_MANAGER(dev))
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return 0;
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mpfs = kzalloc(sizeof(*mpfs), GFP_KERNEL);
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if (!mpfs)
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return -ENOMEM;
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mutex_init(&mpfs->lock);
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mpfs->size = l2table_size;
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mpfs->bitmap = bitmap_zalloc(l2table_size, GFP_KERNEL);
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if (!mpfs->bitmap) {
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kfree(mpfs);
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return -ENOMEM;
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}
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dev->priv.mpfs = mpfs;
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return 0;
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}
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void mlx5_mpfs_cleanup(struct mlx5_core_dev *dev)
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{
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struct mlx5_mpfs *mpfs = dev->priv.mpfs;
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if (!mpfs)
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return;
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WARN_ON(!hlist_empty(mpfs->hash));
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bitmap_free(mpfs->bitmap);
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kfree(mpfs);
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}
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int mlx5_mpfs_add_mac(struct mlx5_core_dev *dev, u8 *mac)
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{
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struct mlx5_mpfs *mpfs = dev->priv.mpfs;
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struct l2table_node *l2addr;
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int err = 0;
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u32 index;
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if (!mpfs)
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return 0;
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mutex_lock(&mpfs->lock);
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l2addr = l2addr_hash_find(mpfs->hash, mac, struct l2table_node);
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if (l2addr) {
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l2addr->ref_count++;
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goto out;
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}
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err = alloc_l2table_index(mpfs, &index);
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if (err)
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goto out;
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l2addr = l2addr_hash_add(mpfs->hash, mac, struct l2table_node, GFP_KERNEL);
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if (!l2addr) {
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err = -ENOMEM;
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goto hash_add_err;
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}
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err = set_l2table_entry_cmd(dev, index, mac);
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if (err)
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goto set_table_entry_err;
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l2addr->index = index;
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l2addr->ref_count = 1;
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mlx5_core_dbg(dev, "MPFS mac added %pM, index (%d)\n", mac, index);
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goto out;
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set_table_entry_err:
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l2addr_hash_del(l2addr);
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hash_add_err:
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free_l2table_index(mpfs, index);
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out:
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mutex_unlock(&mpfs->lock);
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return err;
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}
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EXPORT_SYMBOL(mlx5_mpfs_add_mac);
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int mlx5_mpfs_del_mac(struct mlx5_core_dev *dev, u8 *mac)
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{
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struct mlx5_mpfs *mpfs = dev->priv.mpfs;
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struct l2table_node *l2addr;
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int err = 0;
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u32 index;
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if (!mpfs)
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return 0;
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mutex_lock(&mpfs->lock);
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l2addr = l2addr_hash_find(mpfs->hash, mac, struct l2table_node);
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if (!l2addr) {
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err = -ENOENT;
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goto unlock;
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}
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if (--l2addr->ref_count > 0)
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goto unlock;
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index = l2addr->index;
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del_l2table_entry_cmd(dev, index);
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l2addr_hash_del(l2addr);
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free_l2table_index(mpfs, index);
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mlx5_core_dbg(dev, "MPFS mac deleted %pM, index (%d)\n", mac, index);
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unlock:
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mutex_unlock(&mpfs->lock);
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return err;
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}
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EXPORT_SYMBOL(mlx5_mpfs_del_mac);
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