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/eswitch.h>
37 #include "mlx5_core.h"
38 #include "lib/mpfs.h"
39
40 /* HW L2 Table (MPFS) management */
set_l2table_entry_cmd(struct mlx5_core_dev * dev,u32 index,u8 * mac)41 static int set_l2table_entry_cmd(struct mlx5_core_dev *dev, u32 index, u8 *mac)
42 {
43 u32 in[MLX5_ST_SZ_DW(set_l2_table_entry_in)] = {0};
44 u32 out[MLX5_ST_SZ_DW(set_l2_table_entry_out)] = {0};
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(dev, in, sizeof(in), out, sizeof(out));
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)] = {0};
59 u32 out[MLX5_ST_SZ_DW(delete_l2_table_entry_out)] = {0};
60
61 MLX5_SET(delete_l2_table_entry_in, in, opcode, MLX5_CMD_OP_DELETE_L2_TABLE_ENTRY);
62 MLX5_SET(delete_l2_table_entry_in, in, table_index, index);
63 return mlx5_cmd_exec(dev, in, sizeof(in), out, sizeof(out));
64 }
65
66 /* UC L2 table hash node */
67 struct l2table_node {
68 struct l2addr_node node;
69 u32 index; /* index in HW l2 table */
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))
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 = kcalloc(BITS_TO_LONGS(l2table_size),
112 sizeof(uintptr_t), GFP_KERNEL);
113 if (!mpfs->bitmap) {
114 kfree(mpfs);
115 return -ENOMEM;
116 }
117
118 dev->priv.mpfs = mpfs;
119 return 0;
120 }
121
mlx5_mpfs_cleanup(struct mlx5_core_dev * dev)122 void mlx5_mpfs_cleanup(struct mlx5_core_dev *dev)
123 {
124 struct mlx5_mpfs *mpfs = dev->priv.mpfs;
125
126 if (!MLX5_ESWITCH_MANAGER(dev))
127 return;
128
129 WARN_ON(!hlist_empty(mpfs->hash));
130 kfree(mpfs->bitmap);
131 kfree(mpfs);
132 }
133
mlx5_mpfs_add_mac(struct mlx5_core_dev * dev,u8 * mac)134 int mlx5_mpfs_add_mac(struct mlx5_core_dev *dev, u8 *mac)
135 {
136 struct mlx5_mpfs *mpfs = dev->priv.mpfs;
137 struct l2table_node *l2addr;
138 u32 index;
139 int err;
140
141 if (!MLX5_ESWITCH_MANAGER(dev))
142 return 0;
143
144 mutex_lock(&mpfs->lock);
145
146 l2addr = l2addr_hash_find(mpfs->hash, mac, struct l2table_node);
147 if (l2addr) {
148 err = -EEXIST;
149 goto abort;
150 }
151
152 err = alloc_l2table_index(mpfs, &index);
153 if (err)
154 goto abort;
155
156 l2addr = l2addr_hash_add(mpfs->hash, mac, struct l2table_node, GFP_KERNEL);
157 if (!l2addr) {
158 free_l2table_index(mpfs, index);
159 err = -ENOMEM;
160 goto abort;
161 }
162
163 l2addr->index = index;
164 err = set_l2table_entry_cmd(dev, index, mac);
165 if (err) {
166 l2addr_hash_del(l2addr);
167 free_l2table_index(mpfs, index);
168 }
169
170 mlx5_core_dbg(dev, "MPFS mac added %pM, index (%d)\n", mac, index);
171 abort:
172 mutex_unlock(&mpfs->lock);
173 return err;
174 }
175
mlx5_mpfs_del_mac(struct mlx5_core_dev * dev,u8 * mac)176 int mlx5_mpfs_del_mac(struct mlx5_core_dev *dev, u8 *mac)
177 {
178 struct mlx5_mpfs *mpfs = dev->priv.mpfs;
179 struct l2table_node *l2addr;
180 int err = 0;
181 u32 index;
182
183 if (!MLX5_ESWITCH_MANAGER(dev))
184 return 0;
185
186 mutex_lock(&mpfs->lock);
187
188 l2addr = l2addr_hash_find(mpfs->hash, mac, struct l2table_node);
189 if (!l2addr) {
190 err = -ENOENT;
191 goto unlock;
192 }
193
194 index = l2addr->index;
195 del_l2table_entry_cmd(dev, index);
196 l2addr_hash_del(l2addr);
197 free_l2table_index(mpfs, index);
198 mlx5_core_dbg(dev, "MPFS mac deleted %pM, index (%d)\n", mac, index);
199 unlock:
200 mutex_unlock(&mpfs->lock);
201 return err;
202 }
203
