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 */
set_l2table_entry_cmd(struct mlx5_core_dev * dev,u32 index,u8 * mac)42 static 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 
del_l2table_entry_cmd(struct mlx5_core_dev * dev,u32 index)56 static 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 */
66 struct l2table_node {
67 	struct l2addr_node node;
68 	u32                index; /* index in HW l2 table */
69 	int                ref_count;
70 };
71 
72 struct 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 
alloc_l2table_index(struct mlx5_mpfs * l2table,u32 * ix)79 static 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 
free_l2table_index(struct mlx5_mpfs * l2table,u32 ix)92 static void free_l2table_index(struct mlx5_mpfs *l2table, u32 ix)
93 {
94 	__clear_bit(ix, l2table->bitmap);
95 }
96 
mlx5_mpfs_init(struct mlx5_core_dev * dev)97 int 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 
mlx5_mpfs_cleanup(struct mlx5_core_dev * dev)121 void 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 
mlx5_mpfs_add_mac(struct mlx5_core_dev * dev,u8 * mac)133 int 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 
171 set_table_entry_err:
172 	l2addr_hash_del(l2addr);
173 hash_add_err:
174 	free_l2table_index(mpfs, index);
175 out:
176 	mutex_unlock(&mpfs->lock);
177 	return err;
178 }
179 EXPORT_SYMBOL(mlx5_mpfs_add_mac);
180 
mlx5_mpfs_del_mac(struct mlx5_core_dev * dev,u8 * mac)181 int 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);
207 unlock:
208 	mutex_unlock(&mpfs->lock);
209 	return err;
210 }
211 EXPORT_SYMBOL(mlx5_mpfs_del_mac);
212