Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6
[linux-2.6.git] / 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
39 static struct ctl_table_header *rds_ib_sysctl_hdr;
40
41 unsigned long rds_ib_sysctl_max_send_wr = RDS_IB_DEFAULT_SEND_WR;
42 unsigned long rds_ib_sysctl_max_recv_wr = RDS_IB_DEFAULT_RECV_WR;
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 unsigned long rds_ib_sysctl_max_unsig_bytes = (16 << 20);
53 static unsigned long rds_ib_sysctl_max_unsig_bytes_min = 1;
54 static 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  */
66 unsigned int rds_ib_sysctl_flow_control = 0;
67
68 ctl_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
122 static struct ctl_path rds_ib_sysctl_path[] = {
123         { .procname = "net", },
124         { .procname = "rds", },
125         { .procname = "ib", },
126         { }
127 };
128
129 void rds_ib_sysctl_exit(void)
130 {
131         if (rds_ib_sysctl_hdr)
132                 unregister_sysctl_table(rds_ib_sysctl_hdr);
133 }
134
135 int __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 }