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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
  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 unsigned long rds_ib_sysctl_max_unsig_bytes = (16 << 20);
  53 static unsigned long rds_ib_sysctl_max_unsig_bytes_min = 1;
  54 static 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  */
  66 unsigned int rds_ib_sysctl_flow_control = 0;
  67
  68 ctl_table rds_ib_sysctl_table[] = {
  69         {
  70                 .ctl_name       = CTL_UNNUMBERED,
  71                 .procname       = "max_send_wr",
  72                 .data           = &rds_ib_sysctl_max_send_wr,
  73                 .maxlen         = sizeof(unsigned long),
  74                 .mode           = 0644,
  75                 .proc_handler   = &proc_doulongvec_minmax,
  76                 .extra1         = &rds_ib_sysctl_max_wr_min,
  77                 .extra2         = &rds_ib_sysctl_max_wr_max,
  78         },
  79         {
  80                 .ctl_name       = CTL_UNNUMBERED,
  81                 .procname       = "max_recv_wr",
  82                 .data           = &rds_ib_sysctl_max_recv_wr,
  83                 .maxlen         = sizeof(unsigned long),
  84                 .mode           = 0644,
  85                 .proc_handler   = &proc_doulongvec_minmax,
  86                 .extra1         = &rds_ib_sysctl_max_wr_min,
  87                 .extra2         = &rds_ib_sysctl_max_wr_max,
  88         },
  89         {
  90                 .ctl_name       = CTL_UNNUMBERED,
  91                 .procname       = "max_unsignaled_wr",
  92                 .data           = &rds_ib_sysctl_max_unsig_wrs,
  93                 .maxlen         = sizeof(unsigned long),
  94                 .mode           = 0644,
  95                 .proc_handler   = &proc_doulongvec_minmax,
  96                 .extra1         = &rds_ib_sysctl_max_unsig_wr_min,
  97                 .extra2         = &rds_ib_sysctl_max_unsig_wr_max,
  98         },
  99         {
 100                 .ctl_name       = CTL_UNNUMBERED,
 101                 .procname       = "max_unsignaled_bytes",
 102                 .data           = &rds_ib_sysctl_max_unsig_bytes,
 103                 .maxlen         = sizeof(unsigned long),
 104                 .mode           = 0644,
 105                 .proc_handler   = &proc_doulongvec_minmax,
 106                 .extra1         = &rds_ib_sysctl_max_unsig_bytes_min,
 107                 .extra2         = &rds_ib_sysctl_max_unsig_bytes_max,
 108         },
 109         {
 110                 .ctl_name       = CTL_UNNUMBERED,
 111                 .procname       = "max_recv_allocation",
 112                 .data           = &rds_ib_sysctl_max_recv_allocation,
 113                 .maxlen         = sizeof(unsigned long),
 114                 .mode           = 0644,
 115                 .proc_handler   = &proc_doulongvec_minmax,
 116         },
 117         {
 118                 .ctl_name       = CTL_UNNUMBERED,
 119                 .procname       = "flow_control",
 120                 .data           = &rds_ib_sysctl_flow_control,
 121                 .maxlen         = sizeof(rds_ib_sysctl_flow_control),
 122                 .mode           = 0644,
 123                 .proc_handler   = &proc_dointvec,
 124         },
 125         { .ctl_name = 0}
 126 };
 127
 128 static struct ctl_path rds_ib_sysctl_path[] = {
 129         { .procname = "net", .ctl_name = CTL_NET, },
 130         { .procname = "rds", .ctl_name = CTL_UNNUMBERED, },
 131         { .procname = "ib", .ctl_name = CTL_UNNUMBERED, },
 132         { }
 133 };
 134
 135 void rds_ib_sysctl_exit(void)
 136 {
 137         if (rds_ib_sysctl_hdr)
 138                 unregister_sysctl_table(rds_ib_sysctl_hdr);
 139 }
 140
 141 int __init rds_ib_sysctl_init(void)
 142 {
 143         rds_ib_sysctl_hdr = register_sysctl_paths(rds_ib_sysctl_path, rds_ib_sysctl_table);
 144         if (rds_ib_sysctl_hdr == NULL)
 145                 return -ENOMEM;
 146         return 0;
 147 }