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

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