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
 22static int min_sndbuf = SMC_BUF_MIN_SIZE;
 23static int min_rcvbuf = SMC_BUF_MIN_SIZE;
 24
 25static 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
 68int __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
 96err_reg:
 97	if (!net_eq(net, &init_net))
 98		kfree(table);
 99err_alloc:
100	return -ENOMEM;
101}
102
103void __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}