net/smc/smc_sysctl.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 /*
0003  *  Shared Memory Communications over RDMA (SMC-R) and RoCE
0004  *
0005  *  smc_sysctl.c: sysctl interface to SMC subsystem.
0006  *
0007  *  Copyright (c) 2022, Alibaba Inc.
0008  *
0009  *  Author: Tony Lu <tonylu@linux.alibaba.com>
0010  *
0011  */
0012
0013 #include <linux/init.h>
0014 #include <linux/sysctl.h>
0015 #include <net/net_namespace.h>
0016
0017 #include "smc.h"
0018 #include "smc_core.h"
0019 #include "smc_sysctl.h"
0020
0021 static struct ctl_table smc_table[] = {
0022     {
0023         .procname       = "autocorking_size",
0024         .data           = &init_net.smc.sysctl_autocorking_size,
0025         .maxlen         = sizeof(unsigned int),
0026         .mode           = 0644,
0027         .proc_handler   = proc_douintvec,
0028     },
0029     {
0030         .procname   = "smcr_buf_type",
0031         .data       = &init_net.smc.sysctl_smcr_buf_type,
0032         .maxlen     = sizeof(unsigned int),
0033         .mode       = 0644,
0034         .proc_handler   = proc_douintvec_minmax,
0035         .extra1     = SYSCTL_ZERO,
0036         .extra2     = SYSCTL_TWO,
0037     },
0038     {  }
0039 };
0040
0041 int __net_init smc_sysctl_net_init(struct net *net)
0042 {
0043     struct ctl_table *table;
0044
0045     table = smc_table;
0046     if (!net_eq(net, &init_net)) {
0047         int i;
0048
0049         table = kmemdup(table, sizeof(smc_table), GFP_KERNEL);
0050         if (!table)
0051             goto err_alloc;
0052
0053         for (i = 0; i < ARRAY_SIZE(smc_table) - 1; i++)
0054             table[i].data += (void *)net - (void *)&init_net;
0055     }
0056
0057     net->smc.smc_hdr = register_net_sysctl(net, "net/smc", table);
0058     if (!net->smc.smc_hdr)
0059         goto err_reg;
0060
0061     net->smc.sysctl_autocorking_size = SMC_AUTOCORKING_DEFAULT_SIZE;
0062     net->smc.sysctl_smcr_buf_type = SMCR_PHYS_CONT_BUFS;
0063
0064     return 0;
0065
0066 err_reg:
0067     if (!net_eq(net, &init_net))
0068         kfree(table);
0069 err_alloc:
0070     return -ENOMEM;
0071 }
0072
0073 void __net_exit smc_sysctl_net_exit(struct net *net)
0074 {
0075     struct ctl_table *table;
0076
0077     table = net->smc.smc_hdr->ctl_table_arg;
0078     unregister_net_sysctl_table(net->smc.smc_hdr);
0079     if (!net_eq(net, &init_net))
0080         kfree(table);
0081 }