1/*
2 * Copyright (c) 2017, Mellanox Technologies. All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses.  You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 *     Redistribution and use in source and binary forms, with or
11 *     without modification, are permitted provided that the following
12 *     conditions are met:
13 *
14 *      - Redistributions of source code must retain the above
15 *        copyright notice, this list of conditions and the following
16 *        disclaimer.
17 *
18 *      - Redistributions in binary form must reproduce the above
19 *        copyright notice, this list of conditions and the following
20 *        disclaimer in the documentation and/or other materials
21 *        provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
31 */
32
33#include <linux/etherdevice.h>
34#include <linux/mlx5/driver.h>
35#include <linux/mlx5/mlx5_ifc.h>
36#include <linux/mlx5/mpfs.h>
37#include <linux/mlx5/eswitch.h>
38#include "mlx5_core.h"
39#include "lib/mpfs.h"
40
41/* HW L2 Table (MPFS) management */
42static int set_l2table_entry_cmd(struct mlx5_core_dev *dev, u32 index, u8 *mac)
43{
44	u32 in[MLX5_ST_SZ_DW(set_l2_table_entry_in)] = {};
45	u8 *in_mac_addr;
46
47	MLX5_SET(set_l2_table_entry_in, in, opcode, MLX5_CMD_OP_SET_L2_TABLE_ENTRY);
48	MLX5_SET(set_l2_table_entry_in, in, table_index, index);
49
50	in_mac_addr = MLX5_ADDR_OF(set_l2_table_entry_in, in, mac_address);
51	ether_addr_copy(&in_mac_addr[2], mac);
52
53	return mlx5_cmd_exec_in(dev, set_l2_table_entry, in);
54}
55
56static int del_l2table_entry_cmd(struct mlx5_core_dev *dev, u32 index)
57{
58	u32 in[MLX5_ST_SZ_DW(delete_l2_table_entry_in)] = {};
59
60	MLX5_SET(delete_l2_table_entry_in, in, opcode, MLX5_CMD_OP_DELETE_L2_TABLE_ENTRY);
61	MLX5_SET(delete_l2_table_entry_in, in, table_index, index);
62	return mlx5_cmd_exec_in(dev, delete_l2_table_entry, in);
63}
64
65/* UC L2 table hash node */
66struct l2table_node {
67	struct l2addr_node node;
68	u32                index; /* index in HW l2 table */
69	int                ref_count;
70};
71
72struct mlx5_mpfs {
73	struct hlist_head    hash[MLX5_L2_ADDR_HASH_SIZE];
74	struct mutex         lock; /* Synchronize l2 table access */
75	u32                  size;
76	unsigned long        *bitmap;
77};
78
79static int alloc_l2table_index(struct mlx5_mpfs *l2table, u32 *ix)
80{
81	int err = 0;
82
83	*ix = find_first_zero_bit(l2table->bitmap, l2table->size);
84	if (*ix >= l2table->size)
85		err = -ENOSPC;
86	else
87		__set_bit(*ix, l2table->bitmap);
88
89	return err;
90}
91
92static void free_l2table_index(struct mlx5_mpfs *l2table, u32 ix)
93{
94	__clear_bit(ix, l2table->bitmap);
95}
96
97int mlx5_mpfs_init(struct mlx5_core_dev *dev)
98{
99	int l2table_size = 1 << MLX5_CAP_GEN(dev, log_max_l2_table);
100	struct mlx5_mpfs *mpfs;
101
102	if (!MLX5_ESWITCH_MANAGER(dev) || l2table_size == 1)
103		return 0;
104
105	mpfs = kzalloc(sizeof(*mpfs), GFP_KERNEL);
106	if (!mpfs)
107		return -ENOMEM;
108
109	mutex_init(&mpfs->lock);
110	mpfs->size   = l2table_size;
111	mpfs->bitmap = bitmap_zalloc(l2table_size, GFP_KERNEL);
112	if (!mpfs->bitmap) {
113		kfree(mpfs);
114		return -ENOMEM;
115	}
116
117	dev->priv.mpfs = mpfs;
118	return 0;
119}
120
121void mlx5_mpfs_cleanup(struct mlx5_core_dev *dev)
122{
123	struct mlx5_mpfs *mpfs = dev->priv.mpfs;
124
125	if (!mpfs)
126		return;
127
128	WARN_ON(!hlist_empty(mpfs->hash));
129	bitmap_free(mpfs->bitmap);
130	kfree(mpfs);
131}
132
133int mlx5_mpfs_add_mac(struct mlx5_core_dev *dev, u8 *mac)
134{
135	struct mlx5_mpfs *mpfs = dev->priv.mpfs;
136	struct l2table_node *l2addr;
137	int err = 0;
138	u32 index;
139
140	if (!mpfs)
141		return 0;
142
143	mutex_lock(&mpfs->lock);
144
145	l2addr = l2addr_hash_find(mpfs->hash, mac, struct l2table_node);
146	if (l2addr) {
147		l2addr->ref_count++;
148		goto out;
149	}
150
151	err = alloc_l2table_index(mpfs, &index);
152	if (err)
153		goto out;
154
155	l2addr = l2addr_hash_add(mpfs->hash, mac, struct l2table_node, GFP_KERNEL);
156	if (!l2addr) {
157		err = -ENOMEM;
158		goto hash_add_err;
159	}
160
161	err = set_l2table_entry_cmd(dev, index, mac);
162	if (err)
163		goto set_table_entry_err;
164
165	l2addr->index = index;
166	l2addr->ref_count = 1;
167
168	mlx5_core_dbg(dev, "MPFS mac added %pM, index (%d)\n", mac, index);
169	goto out;
170
171set_table_entry_err:
172	l2addr_hash_del(l2addr);
173hash_add_err:
174	free_l2table_index(mpfs, index);
175out:
176	mutex_unlock(&mpfs->lock);
177	return err;
178}
179EXPORT_SYMBOL(mlx5_mpfs_add_mac);
180
181int mlx5_mpfs_del_mac(struct mlx5_core_dev *dev, u8 *mac)
182{
183	struct mlx5_mpfs *mpfs = dev->priv.mpfs;
184	struct l2table_node *l2addr;
185	int err = 0;
186	u32 index;
187
188	if (!mpfs)
189		return 0;
190
191	mutex_lock(&mpfs->lock);
192
193	l2addr = l2addr_hash_find(mpfs->hash, mac, struct l2table_node);
194	if (!l2addr) {
195		err = -ENOENT;
196		goto unlock;
197	}
198
199	if (--l2addr->ref_count > 0)
200		goto unlock;
201
202	index = l2addr->index;
203	del_l2table_entry_cmd(dev, index);
204	l2addr_hash_del(l2addr);
205	free_l2table_index(mpfs, index);
206	mlx5_core_dbg(dev, "MPFS mac deleted %pM, index (%d)\n", mac, index);
207unlock:
208	mutex_unlock(&mpfs->lock);
209	return err;
210}
211EXPORT_SYMBOL(mlx5_mpfs_del_mac);
212