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 /*
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 struct ctl_table rds_ib_sysctl_table[] = {
65 {
66 .procname = "max_send_wr",
67 .data = &rds_ib_sysctl_max_send_wr,
68 .maxlen = sizeof(unsigned long),
69 .mode = 0644,
70 .proc_handler = proc_doulongvec_minmax,
71 .extra1 = &rds_ib_sysctl_max_wr_min,
72 .extra2 = &rds_ib_sysctl_max_wr_max,
73 },
74 {
75 .procname = "max_recv_wr",
76 .data = &rds_ib_sysctl_max_recv_wr,
77 .maxlen = sizeof(unsigned long),
78 .mode = 0644,
79 .proc_handler = proc_doulongvec_minmax,
80 .extra1 = &rds_ib_sysctl_max_wr_min,
81 .extra2 = &rds_ib_sysctl_max_wr_max,
82 },
83 {
84 .procname = "max_unsignaled_wr",
85 .data = &rds_ib_sysctl_max_unsig_wrs,
86 .maxlen = sizeof(unsigned long),
87 .mode = 0644,
88 .proc_handler = proc_doulongvec_minmax,
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",
94 .data = &rds_ib_sysctl_max_recv_allocation,
95 .maxlen = sizeof(unsigned long),
96 .mode = 0644,
97 .proc_handler = proc_doulongvec_minmax,
98 },
99 {
100 .procname = "flow_control",
101 .data = &rds_ib_sysctl_flow_control,
102 .maxlen = sizeof(rds_ib_sysctl_flow_control),
103 .mode = 0644,
104 .proc_handler = proc_dointvec,
105 },
106 { }
107 };
108
109 void rds_ib_sysctl_exit(void)
110 {
111 if (rds_ib_sysctl_hdr)
112 unregister_net_sysctl_table(rds_ib_sysctl_hdr);
113 }
114
115 int rds_ib_sysctl_init(void)
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 }