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
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 */
62unsigned int rds_ib_sysctl_flow_control = 0;
63
64static 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
109void rds_ib_sysctl_exit(void)
110{
111	if (rds_ib_sysctl_hdr)
112		unregister_net_sysctl_table(rds_ib_sysctl_hdr);
113}
114
115int 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}
122