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 "iw.h"
 38
 39static struct ctl_table_header *rds_iw_sysctl_hdr;
 40
 41unsigned long rds_iw_sysctl_max_send_wr = RDS_IW_DEFAULT_SEND_WR;
 42unsigned long rds_iw_sysctl_max_recv_wr = RDS_IW_DEFAULT_RECV_WR;
 43unsigned long rds_iw_sysctl_max_recv_allocation = (128 * 1024 * 1024) / RDS_FRAG_SIZE;
 44static unsigned long rds_iw_sysctl_max_wr_min = 1;
 45/* hardware will fail CQ creation long before this */
 46static unsigned long rds_iw_sysctl_max_wr_max = (u32)~0;
 47
 48unsigned long rds_iw_sysctl_max_unsig_wrs = 16;
 49static unsigned long rds_iw_sysctl_max_unsig_wr_min = 1;
 50static unsigned long rds_iw_sysctl_max_unsig_wr_max = 64;
 51
 52unsigned long rds_iw_sysctl_max_unsig_bytes = (16 << 20);
 53static unsigned long rds_iw_sysctl_max_unsig_bytes_min = 1;
 54static unsigned long rds_iw_sysctl_max_unsig_bytes_max = ~0UL;
 55
 56unsigned int rds_iw_sysctl_flow_control = 1;
 57
 58static ctl_table rds_iw_sysctl_table[] = {
 59	{
 60		.procname       = "max_send_wr",
 61		.data		= &rds_iw_sysctl_max_send_wr,
 62		.maxlen         = sizeof(unsigned long),
 63		.mode           = 0644,
 64		.proc_handler   = proc_doulongvec_minmax,
 65		.extra1		= &rds_iw_sysctl_max_wr_min,
 66		.extra2		= &rds_iw_sysctl_max_wr_max,
 67	},
 68	{
 69		.procname       = "max_recv_wr",
 70		.data		= &rds_iw_sysctl_max_recv_wr,
 71		.maxlen         = sizeof(unsigned long),
 72		.mode           = 0644,
 73		.proc_handler   = proc_doulongvec_minmax,
 74		.extra1		= &rds_iw_sysctl_max_wr_min,
 75		.extra2		= &rds_iw_sysctl_max_wr_max,
 76	},
 77	{
 78		.procname       = "max_unsignaled_wr",
 79		.data		= &rds_iw_sysctl_max_unsig_wrs,
 80		.maxlen         = sizeof(unsigned long),
 81		.mode           = 0644,
 82		.proc_handler   = proc_doulongvec_minmax,
 83		.extra1		= &rds_iw_sysctl_max_unsig_wr_min,
 84		.extra2		= &rds_iw_sysctl_max_unsig_wr_max,
 85	},
 86	{
 87		.procname       = "max_unsignaled_bytes",
 88		.data		= &rds_iw_sysctl_max_unsig_bytes,
 89		.maxlen         = sizeof(unsigned long),
 90		.mode           = 0644,
 91		.proc_handler   = proc_doulongvec_minmax,
 92		.extra1		= &rds_iw_sysctl_max_unsig_bytes_min,
 93		.extra2		= &rds_iw_sysctl_max_unsig_bytes_max,
 94	},
 95	{
 96		.procname       = "max_recv_allocation",
 97		.data		= &rds_iw_sysctl_max_recv_allocation,
 98		.maxlen         = sizeof(unsigned long),
 99		.mode           = 0644,
100		.proc_handler   = proc_doulongvec_minmax,
101	},
102	{
103		.procname	= "flow_control",
104		.data		= &rds_iw_sysctl_flow_control,
105		.maxlen		= sizeof(rds_iw_sysctl_flow_control),
106		.mode		= 0644,
107		.proc_handler	= proc_dointvec,
108	},
109	{ }
110};
111
112static struct ctl_path rds_iw_sysctl_path[] = {
113	{ .procname = "net", },
114	{ .procname = "rds", },
115	{ .procname = "iw", },
116	{ }
117};
118
119void rds_iw_sysctl_exit(void)
120{
121	if (rds_iw_sysctl_hdr)
122		unregister_sysctl_table(rds_iw_sysctl_hdr);
123}
124
125int rds_iw_sysctl_init(void)
126{
127	rds_iw_sysctl_hdr = register_sysctl_paths(rds_iw_sysctl_path, rds_iw_sysctl_table);
128	if (!rds_iw_sysctl_hdr)
129		return -ENOMEM;
130	return 0;
131}