Linux Kernel  3.7.1
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ib_sysctl.c
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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 
39 static struct ctl_table_header *rds_ib_sysctl_hdr;
40 
43 unsigned long rds_ib_sysctl_max_recv_allocation = (128 * 1024 * 1024) / RDS_FRAG_SIZE;
44 static unsigned long rds_ib_sysctl_max_wr_min = 1;
45 /* hardware will fail CQ creation long before this */
46 static unsigned long rds_ib_sysctl_max_wr_max = (u32)~0;
47 
48 unsigned long rds_ib_sysctl_max_unsig_wrs = 16;
49 static unsigned long rds_ib_sysctl_max_unsig_wr_min = 1;
50 static unsigned long rds_ib_sysctl_max_unsig_wr_max = 64;
51 
52 /*
53  * This sysctl does nothing.
54  *
55  * Backwards compatibility with RDS 3.0 wire protocol
56  * disables initial FC credit exchange.
57  * If it's ever possible to drop 3.0 support,
58  * setting this to 1 and moving init/refill of send/recv
59  * rings from ib_cm_connect_complete() back into ib_setup_qp()
60  * will cause credits to be added before protocol negotiation.
61  */
62 unsigned int rds_ib_sysctl_flow_control = 0;
63 
64 static ctl_table rds_ib_sysctl_table[] = {
65  {
66  .procname = "max_send_wr",
68  .maxlen = sizeof(unsigned long),
69  .mode = 0644,
71  .extra1 = &rds_ib_sysctl_max_wr_min,
72  .extra2 = &rds_ib_sysctl_max_wr_max,
73  },
74  {
75  .procname = "max_recv_wr",
77  .maxlen = sizeof(unsigned long),
78  .mode = 0644,
80  .extra1 = &rds_ib_sysctl_max_wr_min,
81  .extra2 = &rds_ib_sysctl_max_wr_max,
82  },
83  {
84  .procname = "max_unsignaled_wr",
86  .maxlen = sizeof(unsigned long),
87  .mode = 0644,
89  .extra1 = &rds_ib_sysctl_max_unsig_wr_min,
90  .extra2 = &rds_ib_sysctl_max_unsig_wr_max,
91  },
92  {
93  .procname = "max_recv_allocation",
95  .maxlen = sizeof(unsigned long),
96  .mode = 0644,
98  },
99  {
100  .procname = "flow_control",
102  .maxlen = sizeof(rds_ib_sysctl_flow_control),
103  .mode = 0644,
105  },
106  { }
107 };
108 
110 {
111  if (rds_ib_sysctl_hdr)
112  unregister_net_sysctl_table(rds_ib_sysctl_hdr);
113 }
114 
116 {
117  rds_ib_sysctl_hdr = register_net_sysctl(&init_net, "net/rds/ib", rds_ib_sysctl_table);
118  if (!rds_ib_sysctl_hdr)
119  return -ENOMEM;
120  return 0;
121 }