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 } 148