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 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 static struct ctl_path rds_ib_sysctl_path[] = { 110 { .procname = "net", }, 111 { .procname = "rds", }, 112 { .procname = "ib", }, 113 { } 114 }; 115 116 void rds_ib_sysctl_exit(void) 117 { 118 if (rds_ib_sysctl_hdr) 119 unregister_sysctl_table(rds_ib_sysctl_hdr); 120 } 121 122 int rds_ib_sysctl_init(void) 123 { 124 rds_ib_sysctl_hdr = register_sysctl_paths(rds_ib_sysctl_path, rds_ib_sysctl_table); 125 if (!rds_ib_sysctl_hdr) 126 return -ENOMEM; 127 return 0; 128 } 129