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// SPDX-License-Identifier: GPL-2.0
/*
* Shared Memory Communications over RDMA (SMC-R) and RoCE
*
* smc_sysctl.c: sysctl interface to SMC subsystem.
*
* Copyright (c) 2022, Alibaba Inc.
*
* Author: Tony Lu <tonylu@linux.alibaba.com>
*
*/
#include <linux/init.h>
#include <linux/sysctl.h>
#include <net/net_namespace.h>
#include "smc.h"
#include "smc_sysctl.h"
static struct ctl_table smc_table[] = {
{
.procname = "autocorking_size",
.data = &init_net.smc.sysctl_autocorking_size,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_douintvec,
},
{ }
};
static __net_init int smc_sysctl_init_net(struct net *net)
{
struct ctl_table *table;
table = smc_table;
if (!net_eq(net, &init_net)) {
int i;
table = kmemdup(table, sizeof(smc_table), GFP_KERNEL);
if (!table)
goto err_alloc;
for (i = 0; i < ARRAY_SIZE(smc_table) - 1; i++)
table[i].data += (void *)net - (void *)&init_net;
}
net->smc.smc_hdr = register_net_sysctl(net, "net/smc", table);
if (!net->smc.smc_hdr)
goto err_reg;
net->smc.sysctl_autocorking_size = SMC_AUTOCORKING_DEFAULT_SIZE;
return 0;
err_reg:
if (!net_eq(net, &init_net))
kfree(table);
err_alloc:
return -ENOMEM;
}
static __net_exit void smc_sysctl_exit_net(struct net *net)
{
unregister_net_sysctl_table(net->smc.smc_hdr);
}
static struct pernet_operations smc_sysctl_ops __net_initdata = {
.init = smc_sysctl_init_net,
.exit = smc_sysctl_exit_net,
};
int __init smc_sysctl_init(void)
{
return register_pernet_subsys(&smc_sysctl_ops);
}
void smc_sysctl_exit(void)
{
unregister_pernet_subsys(&smc_sysctl_ops);
}
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