tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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_sysctl.h"
20
21static struct ctl_table smc_table[] = {
22 {
23 .procname = "autocorking_size",
24 .data = &init_net.smc.sysctl_autocorking_size,
25 .maxlen = sizeof(unsigned int),
26 .mode = 0644,
27 .proc_handler = proc_douintvec,
28 },
29 {
30 .procname = "smcr_buf_type",
31 .data = &init_net.smc.sysctl_smcr_buf_type,
32 .maxlen = sizeof(unsigned int),
33 .mode = 0644,
34 .proc_handler = proc_douintvec_minmax,
35 .extra1 = SYSCTL_ZERO,
36 .extra2 = SYSCTL_TWO,
37 },
38 { }
39};
40
41int __net_init smc_sysctl_net_init(struct net *net)
42{
43 struct ctl_table *table;
44
45 table = smc_table;
46 if (!net_eq(net, &init_net)) {
47 int i;
48
49 table = kmemdup(table, sizeof(smc_table), GFP_KERNEL);
50 if (!table)
51 goto err_alloc;
52
53 for (i = 0; i < ARRAY_SIZE(smc_table) - 1; i++)
54 table[i].data += (void *)net - (void *)&init_net;
55 }
56
57 net->smc.smc_hdr = register_net_sysctl(net, "net/smc", table);
58 if (!net->smc.smc_hdr)
59 goto err_reg;
60
61 net->smc.sysctl_autocorking_size = SMC_AUTOCORKING_DEFAULT_SIZE;
62 net->smc.sysctl_smcr_buf_type = SMCR_PHYS_CONT_BUFS;
63
64 return 0;
65
66err_reg:
67 if (!net_eq(net, &init_net))
68 kfree(table);
69err_alloc:
70 return -ENOMEM;
71}
72
73void __net_exit smc_sysctl_net_exit(struct net *net)
74{
75 struct ctl_table *table;
76
77 table = net->smc.smc_hdr->ctl_table_arg;
78 unregister_net_sysctl_table(net->smc.smc_hdr);
79 if (!net_eq(net, &init_net))
80 kfree(table);
81}