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
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
|
/* SPDX-License-Identifier: BSD-3-Clause
* Copyright 2016 6WIND S.A.
* Copyright 2016 Mellanox Technologies, Ltd
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/stat.h>
#include "mlx5.h"
#include "mlx5_utils.h"
/**
* Initialise the socket to communicate with the secondary process
*
* @param[in] dev
* Pointer to Ethernet device.
*
* @return
* 0 on success, a negative errno value otherwise and rte_errno is set.
*/
int
mlx5_socket_init(struct rte_eth_dev *dev)
{
struct priv *priv = dev->data->dev_private;
struct sockaddr_un sun = {
.sun_family = AF_UNIX,
};
int ret;
int flags;
/*
* Close the last socket that was used to communicate
* with the secondary process
*/
if (priv->primary_socket)
mlx5_socket_uninit(dev);
/*
* Initialise the socket to communicate with the secondary
* process.
*/
ret = socket(AF_UNIX, SOCK_STREAM, 0);
if (ret < 0) {
rte_errno = errno;
DRV_LOG(WARNING, "port %u secondary process not supported: %s",
dev->data->port_id, strerror(errno));
goto error;
}
priv->primary_socket = ret;
flags = fcntl(priv->primary_socket, F_GETFL, 0);
if (flags == -1) {
rte_errno = errno;
goto error;
}
ret = fcntl(priv->primary_socket, F_SETFL, flags | O_NONBLOCK);
if (ret < 0) {
rte_errno = errno;
goto error;
}
snprintf(sun.sun_path, sizeof(sun.sun_path), "/var/tmp/%s_%d",
MLX5_DRIVER_NAME, priv->primary_socket);
remove(sun.sun_path);
ret = bind(priv->primary_socket, (const struct sockaddr *)&sun,
sizeof(sun));
if (ret < 0) {
rte_errno = errno;
DRV_LOG(WARNING,
"port %u cannot bind socket, secondary process not"
" supported: %s",
dev->data->port_id, strerror(errno));
goto close;
}
ret = listen(priv->primary_socket, 0);
if (ret < 0) {
rte_errno = errno;
DRV_LOG(WARNING, "port %u secondary process not supported: %s",
dev->data->port_id, strerror(errno));
goto close;
}
return 0;
close:
remove(sun.sun_path);
error:
claim_zero(close(priv->primary_socket));
priv->primary_socket = 0;
return -rte_errno;
}
/**
* Un-Initialise the socket to communicate with the secondary process
*
* @param[in] dev
*/
void
mlx5_socket_uninit(struct rte_eth_dev *dev)
{
struct priv *priv = dev->data->dev_private;
MKSTR(path, "/var/tmp/%s_%d", MLX5_DRIVER_NAME, priv->primary_socket);
claim_zero(close(priv->primary_socket));
priv->primary_socket = 0;
claim_zero(remove(path));
}
/**
* Handle socket interrupts.
*
* @param dev
* Pointer to Ethernet device.
*/
void
mlx5_socket_handle(struct rte_eth_dev *dev)
{
struct priv *priv = dev->data->dev_private;
int conn_sock;
int ret = 0;
struct cmsghdr *cmsg = NULL;
struct ucred *cred = NULL;
char buf[CMSG_SPACE(sizeof(struct ucred))] = { 0 };
char vbuf[1024] = { 0 };
struct iovec io = {
.iov_base = vbuf,
.iov_len = sizeof(*vbuf),
};
struct msghdr msg = {
.msg_iov = &io,
.msg_iovlen = 1,
.msg_control = buf,
.msg_controllen = sizeof(buf),
};
int *fd;
/* Accept the connection from the client. */
conn_sock = accept(priv->primary_socket, NULL, NULL);
if (conn_sock < 0) {
DRV_LOG(WARNING, "port %u connection failed: %s",
dev->data->port_id, strerror(errno));
return;
}
ret = setsockopt(conn_sock, SOL_SOCKET, SO_PASSCRED, &(int){1},
sizeof(int));
if (ret < 0) {
ret = errno;
DRV_LOG(WARNING, "port %u cannot change socket options: %s",
dev->data->port_id, strerror(rte_errno));
goto error;
}
ret = recvmsg(conn_sock, &msg, MSG_WAITALL);
if (ret < 0) {
ret = errno;
DRV_LOG(WARNING, "port %u received an empty message: %s",
dev->data->port_id, strerror(rte_errno));
goto error;
}
/* Expect to receive credentials only. */
cmsg = CMSG_FIRSTHDR(&msg);
if (cmsg == NULL) {
DRV_LOG(WARNING, "port %u no message", dev->data->port_id);
goto error;
}
if ((cmsg->cmsg_type == SCM_CREDENTIALS) &&
(cmsg->cmsg_len >= sizeof(*cred))) {
cred = (struct ucred *)CMSG_DATA(cmsg);
assert(cred != NULL);
}
cmsg = CMSG_NXTHDR(&msg, cmsg);
if (cmsg != NULL) {
DRV_LOG(WARNING, "port %u message wrongly formatted",
dev->data->port_id);
goto error;
}
/* Make sure all the ancillary data was received and valid. */
if ((cred == NULL) || (cred->uid != getuid()) ||
(cred->gid != getgid())) {
DRV_LOG(WARNING, "port %u wrong credentials",
dev->data->port_id);
goto error;
}
/* Set-up the ancillary data. */
cmsg = CMSG_FIRSTHDR(&msg);
assert(cmsg != NULL);
cmsg->cmsg_level = SOL_SOCKET;
cmsg->cmsg_type = SCM_RIGHTS;
cmsg->cmsg_len = CMSG_LEN(sizeof(priv->ctx->cmd_fd));
fd = (int *)CMSG_DATA(cmsg);
*fd = priv->ctx->cmd_fd;
ret = sendmsg(conn_sock, &msg, 0);
if (ret < 0)
DRV_LOG(WARNING, "port %u cannot send response",
dev->data->port_id);
error:
close(conn_sock);
}
/**
* Connect to the primary process.
*
* @param[in] dev
* Pointer to Ethernet structure.
*
* @return
* fd on success, negative errno value otherwise and rte_errno is set.
*/
int
mlx5_socket_connect(struct rte_eth_dev *dev)
{
struct priv *priv = dev->data->dev_private;
struct sockaddr_un sun = {
.sun_family = AF_UNIX,
};
int socket_fd = -1;
int *fd = NULL;
int ret;
struct ucred *cred;
char buf[CMSG_SPACE(sizeof(*cred))] = { 0 };
char vbuf[1024] = { 0 };
struct iovec io = {
.iov_base = vbuf,
.iov_len = sizeof(*vbuf),
};
struct msghdr msg = {
.msg_control = buf,
.msg_controllen = sizeof(buf),
.msg_iov = &io,
.msg_iovlen = 1,
};
struct cmsghdr *cmsg;
ret = socket(AF_UNIX, SOCK_STREAM, 0);
if (ret < 0) {
rte_errno = errno;
DRV_LOG(WARNING, "port %u cannot connect to primary",
dev->data->port_id);
goto error;
}
socket_fd = ret;
snprintf(sun.sun_path, sizeof(sun.sun_path), "/var/tmp/%s_%d",
MLX5_DRIVER_NAME, priv->primary_socket);
ret = connect(socket_fd, (const struct sockaddr *)&sun, sizeof(sun));
if (ret < 0) {
rte_errno = errno;
DRV_LOG(WARNING, "port %u cannot connect to primary",
dev->data->port_id);
goto error;
}
cmsg = CMSG_FIRSTHDR(&msg);
if (cmsg == NULL) {
rte_errno = EINVAL;
DRV_LOG(DEBUG, "port %u cannot get first message",
dev->data->port_id);
goto error;
}
cmsg->cmsg_level = SOL_SOCKET;
cmsg->cmsg_type = SCM_CREDENTIALS;
cmsg->cmsg_len = CMSG_LEN(sizeof(*cred));
cred = (struct ucred *)CMSG_DATA(cmsg);
if (cred == NULL) {
rte_errno = EINVAL;
DRV_LOG(DEBUG, "port %u no credentials received",
dev->data->port_id);
goto error;
}
cred->pid = getpid();
cred->uid = getuid();
cred->gid = getgid();
ret = sendmsg(socket_fd, &msg, MSG_DONTWAIT);
if (ret < 0) {
rte_errno = errno;
DRV_LOG(WARNING,
"port %u cannot send credentials to primary: %s",
dev->data->port_id, strerror(errno));
goto error;
}
ret = recvmsg(socket_fd, &msg, MSG_WAITALL);
if (ret <= 0) {
rte_errno = errno;
DRV_LOG(WARNING, "port %u no message from primary: %s",
dev->data->port_id, strerror(errno));
goto error;
}
cmsg = CMSG_FIRSTHDR(&msg);
if (cmsg == NULL) {
rte_errno = EINVAL;
DRV_LOG(WARNING, "port %u no file descriptor received",
dev->data->port_id);
goto error;
}
fd = (int *)CMSG_DATA(cmsg);
if (*fd < 0) {
DRV_LOG(WARNING, "port %u no file descriptor received: %s",
dev->data->port_id, strerror(errno));
rte_errno = *fd;
goto error;
}
ret = *fd;
close(socket_fd);
return ret;
error:
if (socket_fd != -1)
close(socket_fd);
return -rte_errno;
}
|
