linux/net/rds/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
  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
  52unsigned long rds_ib_sysctl_max_unsig_bytes = (16 << 20);
  53static unsigned long rds_ib_sysctl_max_unsig_bytes_min = 1;
  54static 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 */
  66unsigned int rds_ib_sysctl_flow_control = 0;
  67
  68ctl_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
 122static struct ctl_path rds_ib_sysctl_path[] = {
 123        { .procname = "net", },
 124        { .procname = "rds", },
 125        { .procname = "ib", },
 126        { }
 127};
 128
 129void rds_ib_sysctl_exit(void)
 130{
 131        if (rds_ib_sysctl_hdr)
 132                unregister_sysctl_table(rds_ib_sysctl_hdr);
 133}
 134
 135int __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}
 142