1 /*
2 * Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved.
3 * Copyright (c) 2015 System Fabric Works, Inc. All rights reserved.
4 *
5 * This software is available to you under a choice of one of two
6 * licenses. You may choose to be licensed under the terms of the GNU
7 * General Public License (GPL) Version 2, available from the file
8 * COPYING in the main directory of this source tree, or the
9 * OpenIB.org BSD license below:
10 *
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
13 * conditions are met:
14 *
15 * - Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
17 * disclaimer.
18 *
19 * - Redistributions in binary form must reproduce the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer in the documentation and/or other materials
22 * provided with the distribution.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
31 * SOFTWARE.
32 */
33
34 #include "rxe.h"
35 #include "rxe_net.h"
36
37 /* Copy argument and remove trailing CR. Return the new length. */
sanitize_arg(const char * val,char * intf,int intf_len)38 static int sanitize_arg(const char *val, char *intf, int intf_len)
39 {
40 int len;
41
42 if (!val)
43 return 0;
44
45 /* Remove newline. */
46 for (len = 0; len < intf_len - 1 && val[len] && val[len] != '\n'; len++)
47 intf[len] = val[len];
48 intf[len] = 0;
49
50 if (len == 0 || (val[len] != 0 && val[len] != '\n'))
51 return 0;
52
53 return len;
54 }
55
rxe_param_set_add(const char * val,const struct kernel_param * kp)56 static int rxe_param_set_add(const char *val, const struct kernel_param *kp)
57 {
58 int len;
59 int err = 0;
60 char intf[32];
61 struct net_device *ndev;
62 struct rxe_dev *exists;
63
64 if (!rxe_initialized) {
65 pr_err("Module parameters are not supported, use rdma link add or rxe_cfg\n");
66 return -EAGAIN;
67 }
68
69 len = sanitize_arg(val, intf, sizeof(intf));
70 if (!len) {
71 pr_err("add: invalid interface name\n");
72 return -EINVAL;
73 }
74
75 ndev = dev_get_by_name(&init_net, intf);
76 if (!ndev) {
77 pr_err("interface %s not found\n", intf);
78 return -EINVAL;
79 }
80
81 exists = rxe_get_dev_from_net(ndev);
82 if (exists) {
83 ib_device_put(&exists->ib_dev);
84 pr_err("already configured on %s\n", intf);
85 err = -EINVAL;
86 goto err;
87 }
88
89 err = rxe_net_add("rxe%d", ndev);
90 if (err) {
91 pr_err("failed to add %s\n", intf);
92 goto err;
93 }
94
95 err:
96 dev_put(ndev);
97 return err;
98 }
99
rxe_param_set_remove(const char * val,const struct kernel_param * kp)100 static int rxe_param_set_remove(const char *val, const struct kernel_param *kp)
101 {
102 int len;
103 char intf[32];
104 struct ib_device *ib_dev;
105
106 len = sanitize_arg(val, intf, sizeof(intf));
107 if (!len) {
108 pr_err("add: invalid interface name\n");
109 return -EINVAL;
110 }
111
112 if (strncmp("all", intf, len) == 0) {
113 pr_info("rxe_sys: remove all");
114 ib_unregister_driver(RDMA_DRIVER_RXE);
115 return 0;
116 }
117
118 ib_dev = ib_device_get_by_name(intf, RDMA_DRIVER_RXE);
119 if (!ib_dev) {
120 pr_err("not configured on %s\n", intf);
121 return -EINVAL;
122 }
123
124 ib_unregister_device_and_put(ib_dev);
125
126 return 0;
127 }
128
129 static const struct kernel_param_ops rxe_add_ops = {
130 .set = rxe_param_set_add,
131 };
132
133 static const struct kernel_param_ops rxe_remove_ops = {
134 .set = rxe_param_set_remove,
135 };
136
137 module_param_cb(add, &rxe_add_ops, NULL, 0200);
138 MODULE_PARM_DESC(add, "DEPRECATED. Create RXE device over network interface");
139 module_param_cb(remove, &rxe_remove_ops, NULL, 0200);
140 MODULE_PARM_DESC(remove, "DEPRECATED. Remove RXE device over network interface");
141