1 // SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
2 /*
3 * Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved.
4 * Copyright (c) 2015 System Fabric Works, Inc. All rights reserved.
5 */
6
7 #include "rxe.h"
8 #include "rxe_net.h"
9
10 /* Copy argument and remove trailing CR. Return the new length. */
sanitize_arg(const char * val,char * intf,int intf_len)11 static int sanitize_arg(const char *val, char *intf, int intf_len)
12 {
13 int len;
14
15 if (!val)
16 return 0;
17
18 /* Remove newline. */
19 for (len = 0; len < intf_len - 1 && val[len] && val[len] != '\n'; len++)
20 intf[len] = val[len];
21 intf[len] = 0;
22
23 if (len == 0 || (val[len] != 0 && val[len] != '\n'))
24 return 0;
25
26 return len;
27 }
28
rxe_param_set_add(const char * val,const struct kernel_param * kp)29 static int rxe_param_set_add(const char *val, const struct kernel_param *kp)
30 {
31 int len;
32 int err = 0;
33 char intf[32];
34 struct net_device *ndev;
35 struct rxe_dev *exists;
36
37 if (!rxe_initialized) {
38 pr_err("Module parameters are not supported, use rdma link add or rxe_cfg\n");
39 return -EAGAIN;
40 }
41
42 len = sanitize_arg(val, intf, sizeof(intf));
43 if (!len) {
44 pr_err("add: invalid interface name\n");
45 return -EINVAL;
46 }
47
48 ndev = dev_get_by_name(&init_net, intf);
49 if (!ndev) {
50 pr_err("interface %s not found\n", intf);
51 return -EINVAL;
52 }
53
54 if (is_vlan_dev(ndev)) {
55 pr_err("rxe creation allowed on top of a real device only\n");
56 err = -EPERM;
57 goto err;
58 }
59
60 exists = rxe_get_dev_from_net(ndev);
61 if (exists) {
62 ib_device_put(&exists->ib_dev);
63 pr_err("already configured on %s\n", intf);
64 err = -EINVAL;
65 goto err;
66 }
67
68 err = rxe_net_add("rxe%d", ndev);
69 if (err) {
70 pr_err("failed to add %s\n", intf);
71 goto err;
72 }
73
74 err:
75 dev_put(ndev);
76 return err;
77 }
78
rxe_param_set_remove(const char * val,const struct kernel_param * kp)79 static int rxe_param_set_remove(const char *val, const struct kernel_param *kp)
80 {
81 int len;
82 char intf[32];
83 struct ib_device *ib_dev;
84
85 len = sanitize_arg(val, intf, sizeof(intf));
86 if (!len) {
87 pr_err("add: invalid interface name\n");
88 return -EINVAL;
89 }
90
91 if (strncmp("all", intf, len) == 0) {
92 pr_info("rxe_sys: remove all");
93 ib_unregister_driver(RDMA_DRIVER_RXE);
94 return 0;
95 }
96
97 ib_dev = ib_device_get_by_name(intf, RDMA_DRIVER_RXE);
98 if (!ib_dev) {
99 pr_err("not configured on %s\n", intf);
100 return -EINVAL;
101 }
102
103 ib_unregister_device_and_put(ib_dev);
104
105 return 0;
106 }
107
108 static const struct kernel_param_ops rxe_add_ops = {
109 .set = rxe_param_set_add,
110 };
111
112 static const struct kernel_param_ops rxe_remove_ops = {
113 .set = rxe_param_set_remove,
114 };
115
116 module_param_cb(add, &rxe_add_ops, NULL, 0200);
117 MODULE_PARM_DESC(add, "DEPRECATED. Create RXE device over network interface");
118 module_param_cb(remove, &rxe_remove_ops, NULL, 0200);
119 MODULE_PARM_DESC(remove, "DEPRECATED. Remove RXE device over network interface");
120