net/smc/smc_sysctl.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *  Shared Memory Communications over RDMA (SMC-R) and RoCE
   4  *
   5  *  smc_sysctl.c: sysctl interface to SMC subsystem.
   6  *
   7  *  Copyright (c) 2022, Alibaba Inc.
   8  *
   9  *  Author: Tony Lu <tonylu@linux.alibaba.com>
  10  *
  11  */
  12
  13 #include <linux/init.h>
  14 #include <linux/sysctl.h>
  15 #include <net/net_namespace.h>
  16
  17 #include "smc.h"
  18 #include "smc_core.h"
  19 #include "smc_llc.h"
  20 #include "smc_sysctl.h"
  21
  22 static struct ctl_table smc_table[] = {
  23         {
  24                 .procname       = "autocorking_size",
  25                 .data           = &init_net.smc.sysctl_autocorking_size,
  26                 .maxlen         = sizeof(unsigned int),
  27                 .mode           = 0644,
  28                 .proc_handler   = proc_douintvec,
  29         },
  30         {
  31                 .procname       = "smcr_buf_type",
  32                 .data           = &init_net.smc.sysctl_smcr_buf_type,
  33                 .maxlen         = sizeof(unsigned int),
  34                 .mode           = 0644,
  35                 .proc_handler   = proc_douintvec_minmax,
  36                 .extra1         = SYSCTL_ZERO,
  37                 .extra2         = SYSCTL_TWO,
  38         },
  39         {
  40                 .procname       = "smcr_testlink_time",
  41                 .data           = &init_net.smc.sysctl_smcr_testlink_time,
  42                 .maxlen         = sizeof(int),
  43                 .mode           = 0644,
  44                 .proc_handler   = proc_dointvec_jiffies,
  45         },
  46         {  }
  47 };
  48
  49 int __net_init smc_sysctl_net_init(struct net *net)
  50 {
  51         struct ctl_table *table;
  52
  53         table = smc_table;
  54         if (!net_eq(net, &init_net)) {
  55                 int i;
  56
  57                 table = kmemdup(table, sizeof(smc_table), GFP_KERNEL);
  58                 if (!table)
  59                         goto err_alloc;
  60
  61                 for (i = 0; i < ARRAY_SIZE(smc_table) - 1; i++)
  62                         table[i].data += (void *)net - (void *)&init_net;
  63         }
  64
  65         net->smc.smc_hdr = register_net_sysctl(net, "net/smc", table);
  66         if (!net->smc.smc_hdr)
  67                 goto err_reg;
  68
  69         net->smc.sysctl_autocorking_size = SMC_AUTOCORKING_DEFAULT_SIZE;
  70         net->smc.sysctl_smcr_buf_type = SMCR_PHYS_CONT_BUFS;
  71         net->smc.sysctl_smcr_testlink_time = SMC_LLC_TESTLINK_DEFAULT_TIME;
  72
  73         return 0;
  74
  75 err_reg:
  76         if (!net_eq(net, &init_net))
  77                 kfree(table);
  78 err_alloc:
  79         return -ENOMEM;
  80 }
  81
  82 void __net_exit smc_sysctl_net_exit(struct net *net)
  83 {
  84         struct ctl_table *table;
  85
  86         table = net->smc.smc_hdr->ctl_table_arg;
  87         unregister_net_sysctl_table(net->smc.smc_hdr);
  88         if (!net_eq(net, &init_net))
  89                 kfree(table);
  90 }