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 52unsigned long rds_ib_sysctl_max_unsig_bytes = (16 << 20); 53static unsigned long rds_ib_sysctl_max_unsig_bytes_min = 1; 54static 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 */ 66unsigned int rds_ib_sysctl_flow_control = 0; 67 68ctl_table rds_ib_sysctl_table[] = { 69 { 70 .procname = "max_send_wr", 71 .data = &rds_ib_sysctl_max_send_wr, 72 .maxlen = sizeof(unsigned long), 73 .mode = 0644, 74 .proc_handler = proc_doulongvec_minmax, 75 .extra1 = &rds_ib_sysctl_max_wr_min, 76 .extra2 = &rds_ib_sysctl_max_wr_max, 77 }, 78 { 79 .procname = "max_recv_wr", 80 .data = &rds_ib_sysctl_max_recv_wr, 81 .maxlen = sizeof(unsigned long), 82 .mode = 0644, 83 .proc_handler = proc_doulongvec_minmax, 84 .extra1 = &rds_ib_sysctl_max_wr_min, 85 .extra2 = &rds_ib_sysctl_max_wr_max, 86 }, 87 { 88 .procname = "max_unsignaled_wr", 89 .data = &rds_ib_sysctl_max_unsig_wrs, 90 .maxlen = sizeof(unsigned long), 91 .mode = 0644, 92 .proc_handler = proc_doulongvec_minmax, 93 .extra1 = &rds_ib_sysctl_max_unsig_wr_min, 94 .extra2 = &rds_ib_sysctl_max_unsig_wr_max, 95 }, 96 { 97 .procname = "max_unsignaled_bytes", 98 .data = &rds_ib_sysctl_max_unsig_bytes, 99 .maxlen = sizeof(unsigned long), 100 .mode = 0644, 101 .proc_handler = proc_doulongvec_minmax, 102 .extra1 = &rds_ib_sysctl_max_unsig_bytes_min, 103 .extra2 = &rds_ib_sysctl_max_unsig_bytes_max, 104 }, 105 { 106 .procname = "max_recv_allocation", 107 .data = &rds_ib_sysctl_max_recv_allocation, 108 .maxlen = sizeof(unsigned long), 109 .mode = 0644, 110 .proc_handler = proc_doulongvec_minmax, 111 }, 112 { 113 .procname = "flow_control", 114 .data = &rds_ib_sysctl_flow_control, 115 .maxlen = sizeof(rds_ib_sysctl_flow_control), 116 .mode = 0644, 117 .proc_handler = proc_dointvec, 118 }, 119 { } 120}; 121 122static struct ctl_path rds_ib_sysctl_path[] = { 123 { .procname = "net", }, 124 { .procname = "rds", }, 125 { .procname = "ib", }, 126 { } 127}; 128 129void rds_ib_sysctl_exit(void) 130{ 131 if (rds_ib_sysctl_hdr) 132 unregister_sysctl_table(rds_ib_sysctl_hdr); 133} 134 135int __init rds_ib_sysctl_init(void) 136{ 137 rds_ib_sysctl_hdr = register_sysctl_paths(rds_ib_sysctl_path, rds_ib_sysctl_table); 138 if (rds_ib_sysctl_hdr == NULL) 139 return -ENOMEM; 140 return 0; 141} 142