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
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (c) 2016 Mellanox Technologies. All rights reserved.
* Copyright (c) 2016 Jiri Pirko <jiri@mellanox.com>
*/
#include <net/genetlink.h>
#include <net/sock.h>
#include "devl_internal.h"
#define DEVLINK_NL_FLAG_NEED_PORT BIT(0)
#define DEVLINK_NL_FLAG_NEED_DEVLINK_OR_PORT BIT(1)
#define DEVLINK_NL_FLAG_NEED_DEV_LOCK BIT(2)
static const struct genl_multicast_group devlink_nl_mcgrps[] = {
[DEVLINK_MCGRP_CONFIG] = { .name = DEVLINK_GENL_MCGRP_CONFIG_NAME },
};
int devlink_nl_put_nested_handle(struct sk_buff *msg, struct net *net,
struct devlink *devlink, int attrtype)
{
struct nlattr *nested_attr;
struct net *devl_net;
nested_attr = nla_nest_start(msg, attrtype);
if (!nested_attr)
return -EMSGSIZE;
if (devlink_nl_put_handle(msg, devlink))
goto nla_put_failure;
rcu_read_lock();
devl_net = read_pnet_rcu(&devlink->_net);
if (!net_eq(net, devl_net)) {
int id = peernet2id_alloc(net, devl_net, GFP_ATOMIC);
rcu_read_unlock();
if (nla_put_s32(msg, DEVLINK_ATTR_NETNS_ID, id))
return -EMSGSIZE;
} else {
rcu_read_unlock();
}
nla_nest_end(msg, nested_attr);
return 0;
nla_put_failure:
nla_nest_cancel(msg, nested_attr);
return -EMSGSIZE;
}
int devlink_nl_msg_reply_and_new(struct sk_buff **msg, struct genl_info *info)
{
int err;
if (*msg) {
err = genlmsg_reply(*msg, info);
if (err)
return err;
}
*msg = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL);
if (!*msg)
return -ENOMEM;
return 0;
}
struct devlink *
devlink_get_from_attrs_lock(struct net *net, struct nlattr **attrs,
bool dev_lock)
{
struct devlink *devlink;
unsigned long index;
char *busname;
char *devname;
if (!attrs[DEVLINK_ATTR_BUS_NAME] || !attrs[DEVLINK_ATTR_DEV_NAME])
return ERR_PTR(-EINVAL);
busname = nla_data(attrs[DEVLINK_ATTR_BUS_NAME]);
devname = nla_data(attrs[DEVLINK_ATTR_DEV_NAME]);
devlinks_xa_for_each_registered_get(net, index, devlink) {
devl_dev_lock(devlink, dev_lock);
if (devl_is_registered(devlink) &&
strcmp(devlink->dev->bus->name, busname) == 0 &&
strcmp(dev_name(devlink->dev), devname) == 0)
return devlink;
devl_dev_unlock(devlink, dev_lock);
devlink_put(devlink);
}
return ERR_PTR(-ENODEV);
}
static int __devlink_nl_pre_doit(struct sk_buff *skb, struct genl_info *info,
u8 flags)
{
bool dev_lock = flags & DEVLINK_NL_FLAG_NEED_DEV_LOCK;
struct devlink_port *devlink_port;
struct devlink *devlink;
int err;
devlink = devlink_get_from_attrs_lock(genl_info_net(info), info->attrs,
dev_lock);
if (IS_ERR(devlink))
return PTR_ERR(devlink);
info->user_ptr[0] = devlink;
if (flags & DEVLINK_NL_FLAG_NEED_PORT) {
devlink_port = devlink_port_get_from_info(devlink, info);
if (IS_ERR(devlink_port)) {
err = PTR_ERR(devlink_port);
goto unlock;
}
info->user_ptr[1] = devlink_port;
} else if (flags & DEVLINK_NL_FLAG_NEED_DEVLINK_OR_PORT) {
devlink_port = devlink_port_get_from_info(devlink, info);
if (!IS_ERR(devlink_port))
info->user_ptr[1] = devlink_port;
}
return 0;
unlock:
devl_dev_unlock(devlink, dev_lock);
devlink_put(devlink);
return err;
}
int devlink_nl_pre_doit(const struct genl_split_ops *ops,
struct sk_buff *skb, struct genl_info *info)
{
return __devlink_nl_pre_doit(skb, info, 0);
}
int devlink_nl_pre_doit_port(const struct genl_split_ops *ops,
struct sk_buff *skb, struct genl_info *info)
{
return __devlink_nl_pre_doit(skb, info, DEVLINK_NL_FLAG_NEED_PORT);
}
int devlink_nl_pre_doit_dev_lock(const struct genl_split_ops *ops,
struct sk_buff *skb, struct genl_info *info)
{
return __devlink_nl_pre_doit(skb, info, DEVLINK_NL_FLAG_NEED_DEV_LOCK);
}
int devlink_nl_pre_doit_port_optional(const struct genl_split_ops *ops,
struct sk_buff *skb,
struct genl_info *info)
{
return __devlink_nl_pre_doit(skb, info, DEVLINK_NL_FLAG_NEED_DEVLINK_OR_PORT);
}
static void __devlink_nl_post_doit(struct sk_buff *skb, struct genl_info *info,
u8 flags)
{
bool dev_lock = flags & DEVLINK_NL_FLAG_NEED_DEV_LOCK;
struct devlink *devlink;
devlink = info->user_ptr[0];
devl_dev_unlock(devlink, dev_lock);
devlink_put(devlink);
}
void devlink_nl_post_doit(const struct genl_split_ops *ops,
struct sk_buff *skb, struct genl_info *info)
{
__devlink_nl_post_doit(skb, info, 0);
}
void
devlink_nl_post_doit_dev_lock(const struct genl_split_ops *ops,
struct sk_buff *skb, struct genl_info *info)
{
__devlink_nl_post_doit(skb, info, DEVLINK_NL_FLAG_NEED_DEV_LOCK);
}
static int devlink_nl_inst_single_dumpit(struct sk_buff *msg,
struct netlink_callback *cb, int flags,
devlink_nl_dump_one_func_t *dump_one,
struct nlattr **attrs)
{
struct devlink *devlink;
int err;
devlink = devlink_get_from_attrs_lock(sock_net(msg->sk), attrs, false);
if (IS_ERR(devlink))
return PTR_ERR(devlink);
err = dump_one(msg, devlink, cb, flags | NLM_F_DUMP_FILTERED);
devl_unlock(devlink);
devlink_put(devlink);
if (err != -EMSGSIZE)
return err;
return msg->len;
}
static int devlink_nl_inst_iter_dumpit(struct sk_buff *msg,
struct netlink_callback *cb, int flags,
devlink_nl_dump_one_func_t *dump_one)
{
struct devlink_nl_dump_state *state = devlink_dump_state(cb);
struct devlink *devlink;
int err = 0;
while ((devlink = devlinks_xa_find_get(sock_net(msg->sk),
&state->instance))) {
devl_lock(devlink);
if (devl_is_registered(devlink))
err = dump_one(msg, devlink, cb, flags);
else
err = 0;
devl_unlock(devlink);
devlink_put(devlink);
if (err)
break;
state->instance++;
/* restart sub-object walk for the next instance */
state->idx = 0;
}
if (err != -EMSGSIZE)
return err;
return msg->len;
}
int devlink_nl_dumpit(struct sk_buff *msg, struct netlink_callback *cb,
devlink_nl_dump_one_func_t *dump_one)
{
const struct genl_info *info = genl_info_dump(cb);
struct nlattr **attrs = info->attrs;
int flags = NLM_F_MULTI;
if (attrs &&
(attrs[DEVLINK_ATTR_BUS_NAME] || attrs[DEVLINK_ATTR_DEV_NAME]))
return devlink_nl_inst_single_dumpit(msg, cb, flags, dump_one,
attrs);
else
return devlink_nl_inst_iter_dumpit(msg, cb, flags, dump_one);
}
struct genl_family devlink_nl_family __ro_after_init = {
.name = DEVLINK_GENL_NAME,
.version = DEVLINK_GENL_VERSION,
.netnsok = true,
.parallel_ops = true,
.module = THIS_MODULE,
.split_ops = devlink_nl_ops,
.n_split_ops = ARRAY_SIZE(devlink_nl_ops),
.resv_start_op = DEVLINK_CMD_SELFTESTS_RUN + 1,
.mcgrps = devlink_nl_mcgrps,
.n_mcgrps = ARRAY_SIZE(devlink_nl_mcgrps),
};
|
