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 <[email protected]>
  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
  25 static struct ctl_table smc_table[] = {
  26         {
  27                 .procname       = "autocorking_size",
  28                 .data           = &init_net.smc.sysctl_autocorking_size,
  29                 .maxlen         = sizeof(unsigned int),
  30                 .mode           = 0644,
  31                 .proc_handler   = proc_douintvec,
  32         },
  33         {
  34                 .procname       = "smcr_buf_type",
  35                 .data           = &init_net.smc.sysctl_smcr_buf_type,
  36                 .maxlen         = sizeof(unsigned int),
  37                 .mode           = 0644,
  38                 .proc_handler   = proc_douintvec_minmax,
  39                 .extra1         = SYSCTL_ZERO,
  40                 .extra2         = SYSCTL_TWO,
  41         },
  42         {
  43                 .procname       = "smcr_testlink_time",
  44                 .data           = &init_net.smc.sysctl_smcr_testlink_time,
  45                 .maxlen         = sizeof(int),
  46                 .mode           = 0644,
  47                 .proc_handler   = proc_dointvec_jiffies,
  48         },
  49         {
  50                 .procname       = "wmem",
  51                 .data           = &init_net.smc.sysctl_wmem,
  52                 .maxlen         = sizeof(int),
  53                 .mode           = 0644,
  54                 .proc_handler   = proc_dointvec_minmax,
  55                 .extra1         = &min_sndbuf,
  56         },
  57         {
  58                 .procname       = "rmem",
  59                 .data           = &init_net.smc.sysctl_rmem,
  60                 .maxlen         = sizeof(int),
  61                 .mode           = 0644,
  62                 .proc_handler   = proc_dointvec_minmax,
  63                 .extra1         = &min_rcvbuf,
  64         },
  65         {  }
  66 };
  67
  68 int __net_init smc_sysctl_net_init(struct net *net)
  69 {
  70         struct ctl_table *table;
  71
  72         table = smc_table;
  73         if (!net_eq(net, &init_net)) {
  74                 int i;
  75
  76                 table = kmemdup(table, sizeof(smc_table), GFP_KERNEL);
  77                 if (!table)
  78                         goto err_alloc;
  79
  80                 for (i = 0; i < ARRAY_SIZE(smc_table) - 1; i++)
  81                         table[i].data += (void *)net - (void *)&init_net;
  82         }
  83
  84         net->smc.smc_hdr = register_net_sysctl(net, "net/smc", table);
  85         if (!net->smc.smc_hdr)
  86                 goto err_reg;
  87
  88         net->smc.sysctl_autocorking_size = SMC_AUTOCORKING_DEFAULT_SIZE;
  89         net->smc.sysctl_smcr_buf_type = SMCR_PHYS_CONT_BUFS;
  90         net->smc.sysctl_smcr_testlink_time = SMC_LLC_TESTLINK_DEFAULT_TIME;
  91         WRITE_ONCE(net->smc.sysctl_wmem, READ_ONCE(net->ipv4.sysctl_tcp_wmem[1]));
  92         WRITE_ONCE(net->smc.sysctl_rmem, READ_ONCE(net->ipv4.sysctl_tcp_rmem[1]));
  93
  94         return 0;
  95
  96 err_reg:
  97         if (!net_eq(net, &init_net))
  98                 kfree(table);
  99 err_alloc:
 100         return -ENOMEM;
 101 }
 102
 103 void __net_exit smc_sysctl_net_exit(struct net *net)
 104 {
 105         struct ctl_table *table;
 106
 107         table = net->smc.smc_hdr->ctl_table_arg;
 108         unregister_net_sysctl_table(net->smc.smc_hdr);
 109         if (!net_eq(net, &init_net))
 110                 kfree(table);
 111 }