Root/net/rds/ib_sysctl.c

1/*
2 * Copyright (c) 2006 Oracle. All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 *
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
17 *
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
31 *
32 */
33#include <linux/kernel.h>
34#include <linux/sysctl.h>
35#include <linux/proc_fs.h>
36
37#include "ib.h"
38
39static struct ctl_table_header *rds_ib_sysctl_hdr;
40
41unsigned long rds_ib_sysctl_max_send_wr = RDS_IB_DEFAULT_SEND_WR;
42unsigned long rds_ib_sysctl_max_recv_wr = RDS_IB_DEFAULT_RECV_WR;
43unsigned long rds_ib_sysctl_max_recv_allocation = (128 * 1024 * 1024) / RDS_FRAG_SIZE;
44static unsigned long rds_ib_sysctl_max_wr_min = 1;
45/* hardware will fail CQ creation long before this */
46static unsigned long rds_ib_sysctl_max_wr_max = (u32)~0;
47
48unsigned long rds_ib_sysctl_max_unsig_wrs = 16;
49static unsigned long rds_ib_sysctl_max_unsig_wr_min = 1;
50static unsigned long rds_ib_sysctl_max_unsig_wr_max = 64;
51
52unsigned long rds_ib_sysctl_max_unsig_bytes = (16 << 20);
53static unsigned long rds_ib_sysctl_max_unsig_bytes_min = 1;
54static unsigned long rds_ib_sysctl_max_unsig_bytes_max = ~0UL;
55
56/*
57 * This sysctl does nothing.
58 *
59 * Backwards compatibility with RDS 3.0 wire protocol
60 * disables initial FC credit exchange.
61 * If it's ever possible to drop 3.0 support,
62 * setting this to 1 and moving init/refill of send/recv
63 * rings from ib_cm_connect_complete() back into ib_setup_qp()
64 * will cause credits to be added before protocol negotiation.
65 */
66unsigned int rds_ib_sysctl_flow_control = 0;
67
68ctl_table rds_ib_sysctl_table[] = {
69    {
70        .procname = "max_send_wr",
71        .data = &rds_ib_sysctl_max_send_wr,
72        .maxlen = sizeof(unsigned long),
73        .mode = 0644,
74        .proc_handler = proc_doulongvec_minmax,
75        .extra1 = &rds_ib_sysctl_max_wr_min,
76        .extra2 = &rds_ib_sysctl_max_wr_max,
77    },
78    {
79        .procname = "max_recv_wr",
80        .data = &rds_ib_sysctl_max_recv_wr,
81        .maxlen = sizeof(unsigned long),
82        .mode = 0644,
83        .proc_handler = proc_doulongvec_minmax,
84        .extra1 = &rds_ib_sysctl_max_wr_min,
85        .extra2 = &rds_ib_sysctl_max_wr_max,
86    },
87    {
88        .procname = "max_unsignaled_wr",
89        .data = &rds_ib_sysctl_max_unsig_wrs,
90        .maxlen = sizeof(unsigned long),
91        .mode = 0644,
92        .proc_handler = proc_doulongvec_minmax,
93        .extra1 = &rds_ib_sysctl_max_unsig_wr_min,
94        .extra2 = &rds_ib_sysctl_max_unsig_wr_max,
95    },
96    {
97        .procname = "max_unsignaled_bytes",
98        .data = &rds_ib_sysctl_max_unsig_bytes,
99        .maxlen = sizeof(unsigned long),
100        .mode = 0644,
101        .proc_handler = proc_doulongvec_minmax,
102        .extra1 = &rds_ib_sysctl_max_unsig_bytes_min,
103        .extra2 = &rds_ib_sysctl_max_unsig_bytes_max,
104    },
105    {
106        .procname = "max_recv_allocation",
107        .data = &rds_ib_sysctl_max_recv_allocation,
108        .maxlen = sizeof(unsigned long),
109        .mode = 0644,
110        .proc_handler = proc_doulongvec_minmax,
111    },
112    {
113        .procname = "flow_control",
114        .data = &rds_ib_sysctl_flow_control,
115        .maxlen = sizeof(rds_ib_sysctl_flow_control),
116        .mode = 0644,
117        .proc_handler = proc_dointvec,
118    },
119    { }
120};
121
122static struct ctl_path rds_ib_sysctl_path[] = {
123    { .procname = "net", },
124    { .procname = "rds", },
125    { .procname = "ib", },
126    { }
127};
128
129void rds_ib_sysctl_exit(void)
130{
131    if (rds_ib_sysctl_hdr)
132        unregister_sysctl_table(rds_ib_sysctl_hdr);
133}
134
135int __init rds_ib_sysctl_init(void)
136{
137    rds_ib_sysctl_hdr = register_sysctl_paths(rds_ib_sysctl_path, rds_ib_sysctl_table);
138    if (rds_ib_sysctl_hdr == NULL)
139        return -ENOMEM;
140    return 0;
141}
142

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