Merge tag 'for-linus-6.0-rc1b-tag' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux-2.6-microblaze.git] / net / smc / smc_sysctl.c
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
21 static 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
41 int __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
66 err_reg:
67         if (!net_eq(net, &init_net))
68                 kfree(table);
69 err_alloc:
70         return -ENOMEM;
71 }
72
73 void __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 }