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
22 static int min_sndbuf = SMC_BUF_MIN_SIZE;
23 static int min_rcvbuf = SMC_BUF_MIN_SIZE;
24 static int max_sndbuf = INT_MAX / 2;
25 static int max_rcvbuf = INT_MAX / 2;
26 static const int net_smc_wmem_init = (64 * 1024);
27 static const int net_smc_rmem_init = (64 * 1024);
28
29 static 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
smc_sysctl_net_init(struct net * net)74 int __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
103 err_reg:
104 if (!net_eq(net, &init_net))
105 kfree(table);
106 err_alloc:
107 return -ENOMEM;
108 }
109
smc_sysctl_net_exit(struct net * net)110 void __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