1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
|
// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
/* Copyright (c) 2020 Mellanox Technologies Ltd */
#include <linux/mlx5/driver.h>
#include "vhca_event.h"
#include "priv.h"
#include "sf.h"
#include "mlx5_ifc_vhca_event.h"
#include "vhca_event.h"
#include "ecpf.h"
struct mlx5_sf_hw {
u32 usr_sfnum;
u8 allocated: 1;
u8 pending_delete: 1;
};
struct mlx5_sf_hw_table {
struct mlx5_core_dev *dev;
struct mlx5_sf_hw *sfs;
int max_local_functions;
u8 ecpu: 1;
struct mutex table_lock; /* Serializes sf deletion and vhca state change handler. */
struct notifier_block vhca_nb;
};
u16 mlx5_sf_sw_to_hw_id(const struct mlx5_core_dev *dev, u16 sw_id)
{
return sw_id + mlx5_sf_start_function_id(dev);
}
static u16 mlx5_sf_hw_to_sw_id(const struct mlx5_core_dev *dev, u16 hw_id)
{
return hw_id - mlx5_sf_start_function_id(dev);
}
int mlx5_sf_hw_table_sf_alloc(struct mlx5_core_dev *dev, u32 usr_sfnum)
{
struct mlx5_sf_hw_table *table = dev->priv.sf_hw_table;
int sw_id = -ENOSPC;
u16 hw_fn_id;
int err;
int i;
if (!table->max_local_functions)
return -EOPNOTSUPP;
mutex_lock(&table->table_lock);
/* Check if sf with same sfnum already exists or not. */
for (i = 0; i < table->max_local_functions; i++) {
if (table->sfs[i].allocated && table->sfs[i].usr_sfnum == usr_sfnum) {
err = -EEXIST;
goto exist_err;
}
}
/* Find the free entry and allocate the entry from the array */
for (i = 0; i < table->max_local_functions; i++) {
if (!table->sfs[i].allocated) {
table->sfs[i].usr_sfnum = usr_sfnum;
table->sfs[i].allocated = true;
sw_id = i;
break;
}
}
if (sw_id == -ENOSPC) {
err = -ENOSPC;
goto err;
}
hw_fn_id = mlx5_sf_sw_to_hw_id(table->dev, sw_id);
err = mlx5_cmd_alloc_sf(table->dev, hw_fn_id);
if (err)
goto err;
err = mlx5_modify_vhca_sw_id(dev, hw_fn_id, table->ecpu, usr_sfnum);
if (err)
goto vhca_err;
mutex_unlock(&table->table_lock);
return sw_id;
vhca_err:
mlx5_cmd_dealloc_sf(table->dev, hw_fn_id);
err:
table->sfs[i].allocated = false;
exist_err:
mutex_unlock(&table->table_lock);
return err;
}
static void _mlx5_sf_hw_id_free(struct mlx5_core_dev *dev, u16 id)
{
struct mlx5_sf_hw_table *table = dev->priv.sf_hw_table;
u16 hw_fn_id;
hw_fn_id = mlx5_sf_sw_to_hw_id(table->dev, id);
mlx5_cmd_dealloc_sf(table->dev, hw_fn_id);
table->sfs[id].allocated = false;
table->sfs[id].pending_delete = false;
}
void mlx5_sf_hw_table_sf_free(struct mlx5_core_dev *dev, u16 id)
{
struct mlx5_sf_hw_table *table = dev->priv.sf_hw_table;
mutex_lock(&table->table_lock);
_mlx5_sf_hw_id_free(dev, id);
mutex_unlock(&table->table_lock);
}
void mlx5_sf_hw_table_sf_deferred_free(struct mlx5_core_dev *dev, u16 id)
{
struct mlx5_sf_hw_table *table = dev->priv.sf_hw_table;
u32 out[MLX5_ST_SZ_DW(query_vhca_state_out)] = {};
u16 hw_fn_id;
u8 state;
int err;
hw_fn_id = mlx5_sf_sw_to_hw_id(dev, id);
mutex_lock(&table->table_lock);
err = mlx5_cmd_query_vhca_state(dev, hw_fn_id, table->ecpu, out, sizeof(out));
if (err)
goto err;
state = MLX5_GET(query_vhca_state_out, out, vhca_state_context.vhca_state);
if (state == MLX5_VHCA_STATE_ALLOCATED) {
mlx5_cmd_dealloc_sf(table->dev, hw_fn_id);
table->sfs[id].allocated = false;
} else {
table->sfs[id].pending_delete = true;
}
err:
mutex_unlock(&table->table_lock);
}
static void mlx5_sf_hw_dealloc_all(struct mlx5_sf_hw_table *table)
{
int i;
for (i = 0; i < table->max_local_functions; i++) {
if (table->sfs[i].allocated)
_mlx5_sf_hw_id_free(table->dev, i);
}
}
int mlx5_sf_hw_table_init(struct mlx5_core_dev *dev)
{
struct mlx5_sf_hw_table *table;
struct mlx5_sf_hw *sfs;
int max_functions;
if (!mlx5_sf_supported(dev) || !mlx5_vhca_event_supported(dev))
return 0;
max_functions = mlx5_sf_max_functions(dev);
table = kzalloc(sizeof(*table), GFP_KERNEL);
if (!table)
return -ENOMEM;
sfs = kcalloc(max_functions, sizeof(*sfs), GFP_KERNEL);
if (!sfs)
goto table_err;
mutex_init(&table->table_lock);
table->dev = dev;
table->sfs = sfs;
table->max_local_functions = max_functions;
table->ecpu = mlx5_read_embedded_cpu(dev);
dev->priv.sf_hw_table = table;
mlx5_core_dbg(dev, "SF HW table: max sfs = %d\n", max_functions);
return 0;
table_err:
kfree(table);
return -ENOMEM;
}
void mlx5_sf_hw_table_cleanup(struct mlx5_core_dev *dev)
{
struct mlx5_sf_hw_table *table = dev->priv.sf_hw_table;
if (!table)
return;
mutex_destroy(&table->table_lock);
kfree(table->sfs);
kfree(table);
}
static int mlx5_sf_hw_vhca_event(struct notifier_block *nb, unsigned long opcode, void *data)
{
struct mlx5_sf_hw_table *table = container_of(nb, struct mlx5_sf_hw_table, vhca_nb);
const struct mlx5_vhca_state_event *event = data;
struct mlx5_sf_hw *sf_hw;
u16 sw_id;
if (event->new_vhca_state != MLX5_VHCA_STATE_ALLOCATED)
return 0;
sw_id = mlx5_sf_hw_to_sw_id(table->dev, event->function_id);
sf_hw = &table->sfs[sw_id];
mutex_lock(&table->table_lock);
/* SF driver notified through firmware that SF is finally detached.
* Hence recycle the sf hardware id for reuse.
*/
if (sf_hw->allocated && sf_hw->pending_delete)
_mlx5_sf_hw_id_free(table->dev, sw_id);
mutex_unlock(&table->table_lock);
return 0;
}
int mlx5_sf_hw_table_create(struct mlx5_core_dev *dev)
{
struct mlx5_sf_hw_table *table = dev->priv.sf_hw_table;
if (!table)
return 0;
table->vhca_nb.notifier_call = mlx5_sf_hw_vhca_event;
return mlx5_vhca_event_notifier_register(table->dev, &table->vhca_nb);
}
void mlx5_sf_hw_table_destroy(struct mlx5_core_dev *dev)
{
struct mlx5_sf_hw_table *table = dev->priv.sf_hw_table;
if (!table)
return;
mlx5_vhca_event_notifier_unregister(table->dev, &table->vhca_nb);
/* Dealloc SFs whose firmware event has been missed. */
mlx5_sf_hw_dealloc_all(table);
}
|
