net/smc/smc_netlink.c

   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_netlink.h"
  23
  24 #define SMC_CMD_MAX_ATTR 1
  25
  26 /* SMC_GENL generic netlink operation definition */
  27 static const struct genl_ops smc_gen_nl_ops[] = {
  28         {
  29                 .cmd = SMC_NETLINK_GET_SYS_INFO,
  30                 /* can be retrieved by unprivileged users */
  31                 .dumpit = smc_nl_get_sys_info,
  32         },
  33         {
  34                 .cmd = SMC_NETLINK_GET_LGR_SMCR,
  35                 /* can be retrieved by unprivileged users */
  36                 .dumpit = smcr_nl_get_lgr,
  37         },
  38         {
  39                 .cmd = SMC_NETLINK_GET_LINK_SMCR,
  40                 /* can be retrieved by unprivileged users */
  41                 .dumpit = smcr_nl_get_link,
  42         },
  43         {
  44                 .cmd = SMC_NETLINK_GET_LGR_SMCD,
  45                 /* can be retrieved by unprivileged users */
  46                 .dumpit = smcd_nl_get_lgr,
  47         },
  48         {
  49                 .cmd = SMC_NETLINK_GET_DEV_SMCD,
  50                 /* can be retrieved by unprivileged users */
  51                 .dumpit = smcd_nl_get_device,
  52         },
  53         {
  54                 .cmd = SMC_NETLINK_GET_DEV_SMCR,
  55                 /* can be retrieved by unprivileged users */
  56                 .dumpit = smcr_nl_get_device,
  57         },
  58 };
  59
  60 static const struct nla_policy smc_gen_nl_policy[2] = {
  61         [SMC_CMD_MAX_ATTR]      = { .type = NLA_REJECT, },
  62 };
  63
  64 /* SMC_GENL family definition */
  65 struct genl_family smc_gen_nl_family __ro_after_init = {
  66         .hdrsize =      0,
  67         .name =         SMC_GENL_FAMILY_NAME,
  68         .version =      SMC_GENL_FAMILY_VERSION,
  69         .maxattr =      SMC_CMD_MAX_ATTR,
  70         .policy =       smc_gen_nl_policy,
  71         .netnsok =      true,
  72         .module =       THIS_MODULE,
  73         .ops =          smc_gen_nl_ops,
  74         .n_ops =        ARRAY_SIZE(smc_gen_nl_ops)
  75 };
  76
  77 int __init smc_nl_init(void)
  78 {
  79         return genl_register_family(&smc_gen_nl_family);
  80 }
  81
  82 void smc_nl_exit(void)
  83 {
  84         genl_unregister_family(&smc_gen_nl_family);
  85 }