1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Shared Memory Communications over RDMA (SMC-R) and RoCE
4 *
5 * Generic netlink support functions to interact with SMC module
6 *
7 * Copyright IBM Corp. 2020
8 *
9 * Author(s): Guvenc Gulce <guvenc@linux.ibm.com>
10 */
11
12 #include <linux/module.h>
13 #include <linux/list.h>
14 #include <linux/ctype.h>
15 #include <linux/mutex.h>
16 #include <linux/if.h>
17 #include <linux/smc.h>
18
19 #include "smc_core.h"
20 #include "smc_ism.h"
21 #include "smc_ib.h"
22 #include "smc_clc.h"
23 #include "smc_stats.h"
24 #include "smc_netlink.h"
25
26 const struct nla_policy
27 smc_gen_ueid_policy[SMC_NLA_EID_TABLE_MAX + 1] = {
28 [SMC_NLA_EID_TABLE_UNSPEC] = { .type = NLA_UNSPEC },
29 [SMC_NLA_EID_TABLE_ENTRY] = { .type = NLA_STRING,
30 .len = SMC_MAX_EID_LEN,
31 },
32 };
33
34 #define SMC_CMD_MAX_ATTR 1
35 /* SMC_GENL generic netlink operation definition */
36 static const struct genl_ops smc_gen_nl_ops[] = {
37 {
38 .cmd = SMC_NETLINK_GET_SYS_INFO,
39 /* can be retrieved by unprivileged users */
40 .dumpit = smc_nl_get_sys_info,
41 },
42 {
43 .cmd = SMC_NETLINK_GET_LGR_SMCR,
44 /* can be retrieved by unprivileged users */
45 .dumpit = smcr_nl_get_lgr,
46 },
47 {
48 .cmd = SMC_NETLINK_GET_LINK_SMCR,
49 /* can be retrieved by unprivileged users */
50 .dumpit = smcr_nl_get_link,
51 },
52 {
53 .cmd = SMC_NETLINK_GET_LGR_SMCD,
54 /* can be retrieved by unprivileged users */
55 .dumpit = smcd_nl_get_lgr,
56 },
57 {
58 .cmd = SMC_NETLINK_GET_DEV_SMCD,
59 /* can be retrieved by unprivileged users */
60 .dumpit = smcd_nl_get_device,
61 },
62 {
63 .cmd = SMC_NETLINK_GET_DEV_SMCR,
64 /* can be retrieved by unprivileged users */
65 .dumpit = smcr_nl_get_device,
66 },
67 {
68 .cmd = SMC_NETLINK_GET_STATS,
69 /* can be retrieved by unprivileged users */
70 .dumpit = smc_nl_get_stats,
71 },
72 {
73 .cmd = SMC_NETLINK_GET_FBACK_STATS,
74 /* can be retrieved by unprivileged users */
75 .dumpit = smc_nl_get_fback_stats,
76 },
77 {
78 .cmd = SMC_NETLINK_DUMP_UEID,
79 /* can be retrieved by unprivileged users */
80 .dumpit = smc_nl_dump_ueid,
81 },
82 {
83 .cmd = SMC_NETLINK_ADD_UEID,
84 .flags = GENL_ADMIN_PERM,
85 .doit = smc_nl_add_ueid,
86 .policy = smc_gen_ueid_policy,
87 },
88 {
89 .cmd = SMC_NETLINK_REMOVE_UEID,
90 .flags = GENL_ADMIN_PERM,
91 .doit = smc_nl_remove_ueid,
92 .policy = smc_gen_ueid_policy,
93 },
94 {
95 .cmd = SMC_NETLINK_FLUSH_UEID,
96 .flags = GENL_ADMIN_PERM,
97 .doit = smc_nl_flush_ueid,
98 },
99 {
100 .cmd = SMC_NETLINK_DUMP_SEID,
101 /* can be retrieved by unprivileged users */
102 .dumpit = smc_nl_dump_seid,
103 },
104 {
105 .cmd = SMC_NETLINK_ENABLE_SEID,
106 .flags = GENL_ADMIN_PERM,
107 .doit = smc_nl_enable_seid,
108 },
109 {
110 .cmd = SMC_NETLINK_DISABLE_SEID,
111 .flags = GENL_ADMIN_PERM,
112 .doit = smc_nl_disable_seid,
113 },
114 {
115 .cmd = SMC_NETLINK_DUMP_HS_LIMITATION,
116 /* can be retrieved by unprivileged users */
117 .dumpit = smc_nl_dump_hs_limitation,
118 },
119 {
120 .cmd = SMC_NETLINK_ENABLE_HS_LIMITATION,
121 .flags = GENL_ADMIN_PERM,
122 .doit = smc_nl_enable_hs_limitation,
123 },
124 {
125 .cmd = SMC_NETLINK_DISABLE_HS_LIMITATION,
126 .flags = GENL_ADMIN_PERM,
127 .doit = smc_nl_disable_hs_limitation,
128 },
129 };
130
131 static const struct nla_policy smc_gen_nl_policy[2] = {
132 [SMC_CMD_MAX_ATTR] = { .type = NLA_REJECT, },
133 };
134
135 /* SMC_GENL family definition */
136 struct genl_family smc_gen_nl_family __ro_after_init = {
137 .hdrsize = 0,
138 .name = SMC_GENL_FAMILY_NAME,
139 .version = SMC_GENL_FAMILY_VERSION,
140 .maxattr = SMC_CMD_MAX_ATTR,
141 .policy = smc_gen_nl_policy,
142 .netnsok = true,
143 .module = THIS_MODULE,
144 .ops = smc_gen_nl_ops,
145 .n_ops = ARRAY_SIZE(smc_gen_nl_ops),
146 .resv_start_op = SMC_NETLINK_DISABLE_HS_LIMITATION + 1,
147 };
148
smc_nl_init(void)149 int __init smc_nl_init(void)
150 {
151 return genl_register_family(&smc_gen_nl_family);
152 }
153
smc_nl_exit(void)154 void smc_nl_exit(void)
155 {
156 genl_unregister_family(&smc_gen_nl_family);
157 }
158