xref: /kernel/linux/linux-6.6/net/smc/smc_sysctl.c (revision 62306a36) 
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;
24static int max_sndbuf = INT_MAX / 2;
25static int max_rcvbuf = INT_MAX / 2;
26static const int net_smc_wmem_init = (64 * 1024);
27static const int net_smc_rmem_init = (64 * 1024);
28
29static 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
74int __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_sz(net, "net/smc", table,
91						  ARRAY_SIZE(smc_table));
92	if (!net->smc.smc_hdr)
93		goto err_reg;
94
95	net->smc.sysctl_autocorking_size = SMC_AUTOCORKING_DEFAULT_SIZE;
96	net->smc.sysctl_smcr_buf_type = SMCR_PHYS_CONT_BUFS;
97	net->smc.sysctl_smcr_testlink_time = SMC_LLC_TESTLINK_DEFAULT_TIME;
98	WRITE_ONCE(net->smc.sysctl_wmem, net_smc_wmem_init);
99	WRITE_ONCE(net->smc.sysctl_rmem, net_smc_rmem_init);
100
101	return 0;
102
103err_reg:
104	if (!net_eq(net, &init_net))
105		kfree(table);
106err_alloc:
107	return -ENOMEM;
108}
109
110void __net_exit smc_sysctl_net_exit(struct net *net)
111{
112	struct ctl_table *table;
113
114	table = net->smc.smc_hdr->ctl_table_arg;
115	unregister_net_sysctl_table(net->smc.smc_hdr);
116	if (!net_eq(net, &init_net))
117		kfree(table);
118}
119