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 int min_sndbuf = SMC_BUF_MIN_SIZE;
  23 static int min_rcvbuf = SMC_BUF_MIN_SIZE;
  24 static int max_sndbuf = INT_MAX / 2;
  25 static int max_rcvbuf = INT_MAX / 2;
  26 static const int net_smc_wmem_init = (64 * 1024);
  27 static const int net_smc_rmem_init = (64 * 1024);
  28
  29 static struct ctl_table smc_table[] = {
  30         {
  31                 .procname       = "autocorking_size",
  32                 .data           = &init_net.smc.sysctl_autocorking_size,
  33                 .maxlen         = sizeof(unsigned int),
  34                 .mode           = 0644,
  35                 .proc_handler   = proc_douintvec,
  36         },
  37         {
  38                 .procname       = "smcr_buf_type",
  39                 .data           = &init_net.smc.sysctl_smcr_buf_type,
  40                 .maxlen         = sizeof(unsigned int),
  41                 .mode           = 0644,
  42                 .proc_handler   = proc_douintvec_minmax,
  43                 .extra1         = SYSCTL_ZERO,
  44                 .extra2         = SYSCTL_TWO,
  45         },
  46         {
  47                 .procname       = "smcr_testlink_time",
  48                 .data           = &init_net.smc.sysctl_smcr_testlink_time,
  49                 .maxlen         = sizeof(int),
  50                 .mode           = 0644,
  51                 .proc_handler   = proc_dointvec_jiffies,
  52         },
  53         {
  54                 .procname       = "wmem",
  55                 .data           = &init_net.smc.sysctl_wmem,
  56                 .maxlen         = sizeof(int),
  57                 .mode           = 0644,
  58                 .proc_handler   = proc_dointvec_minmax,
  59                 .extra1         = &min_sndbuf,
  60                 .extra2         = &max_sndbuf,
  61         },
  62         {
  63                 .procname       = "rmem",
  64                 .data           = &init_net.smc.sysctl_rmem,
  65                 .maxlen         = sizeof(int),
  66                 .mode           = 0644,
  67                 .proc_handler   = proc_dointvec_minmax,
  68                 .extra1         = &min_rcvbuf,
  69                 .extra2         = &max_rcvbuf,
  70         },
  71         {  }
  72 };
  73
  74 int __net_init smc_sysctl_net_init(struct net *net)
  75 {
  76         struct ctl_table *table;
  77
  78         table = smc_table;
  79         if (!net_eq(net, &init_net)) {
  80                 int i;
  81
  82                 table = kmemdup(table, sizeof(smc_table), GFP_KERNEL);
  83                 if (!table)
  84                         goto err_alloc;
  85
  86                 for (i = 0; i < ARRAY_SIZE(smc_table) - 1; i++)
  87                         table[i].data += (void *)net - (void *)&init_net;
  88         }
  89
  90         net->smc.smc_hdr = register_net_sysctl(net, "net/smc", table);
  91         if (!net->smc.smc_hdr)
  92                 goto err_reg;
  93
  94         net->smc.sysctl_autocorking_size = SMC_AUTOCORKING_DEFAULT_SIZE;
  95         net->smc.sysctl_smcr_buf_type = SMCR_PHYS_CONT_BUFS;
  96         net->smc.sysctl_smcr_testlink_time = SMC_LLC_TESTLINK_DEFAULT_TIME;
  97         WRITE_ONCE(net->smc.sysctl_wmem, net_smc_wmem_init);
  98         WRITE_ONCE(net->smc.sysctl_rmem, net_smc_rmem_init);
  99
 100         return 0;
 101
 102 err_reg:
 103         if (!net_eq(net, &init_net))
 104                 kfree(table);
 105 err_alloc:
 106         return -ENOMEM;
 107 }
 108
 109 void __net_exit smc_sysctl_net_exit(struct net *net)
 110 {
 111         struct ctl_table *table;
 112
 113         table = net->smc.smc_hdr->ctl_table_arg;
 114         unregister_net_sysctl_table(net->smc.smc_hdr);
 115         if (!net_eq(net, &init_net))
 116                 kfree(table);
 117 }