LXR linux/net/rds/ib

   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