1// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause 2/* 3 * Copyright (c) 2015-2018 Oracle. All rights reserved. 4 * Copyright (c) 2005-2006 Network Appliance, Inc. All rights reserved. 5 * 6 * This software is available to you under a choice of one of two 7 * licenses. You may choose to be licensed under the terms of the GNU 8 * General Public License (GPL) Version 2, available from the file 9 * COPYING in the main directory of this source tree, or the BSD-type 10 * license below: 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 16 * Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 19 * Redistributions in binary form must reproduce the above 20 * copyright notice, this list of conditions and the following 21 * disclaimer in the documentation and/or other materials provided 22 * with the distribution. 23 * 24 * Neither the name of the Network Appliance, Inc. nor the names of 25 * its contributors may be used to endorse or promote products 26 * derived from this software without specific prior written 27 * permission. 28 * 29 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 30 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 31 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 32 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 33 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 34 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 35 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 36 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 37 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 38 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 39 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 40 * 41 * Author: Tom Tucker <tom@opengridcomputing.com> 42 */ 43 44#include <linux/slab.h> 45#include <linux/fs.h> 46#include <linux/sysctl.h> 47#include <linux/workqueue.h> 48#include <linux/sunrpc/clnt.h> 49#include <linux/sunrpc/sched.h> 50#include <linux/sunrpc/svc_rdma.h> 51 52#define RPCDBG_FACILITY RPCDBG_SVCXPRT 53 54/* RPC/RDMA parameters */ 55unsigned int svcrdma_ord = 16; /* historical default */ 56static unsigned int min_ord = 1; 57static unsigned int max_ord = 255; 58unsigned int svcrdma_max_requests = RPCRDMA_MAX_REQUESTS; 59unsigned int svcrdma_max_bc_requests = RPCRDMA_MAX_BC_REQUESTS; 60static unsigned int min_max_requests = 4; 61static unsigned int max_max_requests = 16384; 62unsigned int svcrdma_max_req_size = RPCRDMA_DEF_INLINE_THRESH; 63static unsigned int min_max_inline = RPCRDMA_DEF_INLINE_THRESH; 64static unsigned int max_max_inline = RPCRDMA_MAX_INLINE_THRESH; 65static unsigned int svcrdma_stat_unused; 66static unsigned int zero; 67 68struct percpu_counter svcrdma_stat_read; 69struct percpu_counter svcrdma_stat_recv; 70struct percpu_counter svcrdma_stat_sq_starve; 71struct percpu_counter svcrdma_stat_write; 72 73enum { 74 SVCRDMA_COUNTER_BUFSIZ = sizeof(unsigned long long), 75}; 76 77static int svcrdma_counter_handler(struct ctl_table *table, int write, 78 void *buffer, size_t *lenp, loff_t *ppos) 79{ 80 struct percpu_counter *stat = (struct percpu_counter *)table->data; 81 char tmp[SVCRDMA_COUNTER_BUFSIZ + 1]; 82 int len; 83 84 if (write) { 85 percpu_counter_set(stat, 0); 86 return 0; 87 } 88 89 len = snprintf(tmp, SVCRDMA_COUNTER_BUFSIZ, "%lld\n", 90 percpu_counter_sum_positive(stat)); 91 if (len >= SVCRDMA_COUNTER_BUFSIZ) 92 return -EFAULT; 93 len = strlen(tmp); 94 if (*ppos > len) { 95 *lenp = 0; 96 return 0; 97 } 98 len -= *ppos; 99 if (len > *lenp) 100 len = *lenp; 101 if (len) 102 memcpy(buffer, tmp, len); 103 *lenp = len; 104 *ppos += len; 105 106 return 0; 107} 108 109static struct ctl_table_header *svcrdma_table_header; 110static struct ctl_table svcrdma_parm_table[] = { 111 { 112 .procname = "max_requests", 113 .data = &svcrdma_max_requests, 114 .maxlen = sizeof(unsigned int), 115 .mode = 0644, 116 .proc_handler = proc_dointvec_minmax, 117 .extra1 = &min_max_requests, 118 .extra2 = &max_max_requests 119 }, 120 { 121 .procname = "max_req_size", 122 .data = &svcrdma_max_req_size, 123 .maxlen = sizeof(unsigned int), 124 .mode = 0644, 125 .proc_handler = proc_dointvec_minmax, 126 .extra1 = &min_max_inline, 127 .extra2 = &max_max_inline 128 }, 129 { 130 .procname = "max_outbound_read_requests", 131 .data = &svcrdma_ord, 132 .maxlen = sizeof(unsigned int), 133 .mode = 0644, 134 .proc_handler = proc_dointvec_minmax, 135 .extra1 = &min_ord, 136 .extra2 = &max_ord, 137 }, 138 139 { 140 .procname = "rdma_stat_read", 141 .data = &svcrdma_stat_read, 142 .maxlen = SVCRDMA_COUNTER_BUFSIZ, 143 .mode = 0644, 144 .proc_handler = svcrdma_counter_handler, 145 }, 146 { 147 .procname = "rdma_stat_recv", 148 .data = &svcrdma_stat_recv, 149 .maxlen = SVCRDMA_COUNTER_BUFSIZ, 150 .mode = 0644, 151 .proc_handler = svcrdma_counter_handler, 152 }, 153 { 154 .procname = "rdma_stat_write", 155 .data = &svcrdma_stat_write, 156 .maxlen = SVCRDMA_COUNTER_BUFSIZ, 157 .mode = 0644, 158 .proc_handler = svcrdma_counter_handler, 159 }, 160 { 161 .procname = "rdma_stat_sq_starve", 162 .data = &svcrdma_stat_sq_starve, 163 .maxlen = SVCRDMA_COUNTER_BUFSIZ, 164 .mode = 0644, 165 .proc_handler = svcrdma_counter_handler, 166 }, 167 { 168 .procname = "rdma_stat_rq_starve", 169 .data = &svcrdma_stat_unused, 170 .maxlen = sizeof(unsigned int), 171 .mode = 0644, 172 .proc_handler = proc_dointvec_minmax, 173 .extra1 = &zero, 174 .extra2 = &zero, 175 }, 176 { 177 .procname = "rdma_stat_rq_poll", 178 .data = &svcrdma_stat_unused, 179 .maxlen = sizeof(unsigned int), 180 .mode = 0644, 181 .proc_handler = proc_dointvec_minmax, 182 .extra1 = &zero, 183 .extra2 = &zero, 184 }, 185 { 186 .procname = "rdma_stat_rq_prod", 187 .data = &svcrdma_stat_unused, 188 .maxlen = sizeof(unsigned int), 189 .mode = 0644, 190 .proc_handler = proc_dointvec_minmax, 191 .extra1 = &zero, 192 .extra2 = &zero, 193 }, 194 { 195 .procname = "rdma_stat_sq_poll", 196 .data = &svcrdma_stat_unused, 197 .maxlen = sizeof(unsigned int), 198 .mode = 0644, 199 .proc_handler = proc_dointvec_minmax, 200 .extra1 = &zero, 201 .extra2 = &zero, 202 }, 203 { 204 .procname = "rdma_stat_sq_prod", 205 .data = &svcrdma_stat_unused, 206 .maxlen = sizeof(unsigned int), 207 .mode = 0644, 208 .proc_handler = proc_dointvec_minmax, 209 .extra1 = &zero, 210 .extra2 = &zero, 211 }, 212 { }, 213}; 214 215static void svc_rdma_proc_cleanup(void) 216{ 217 if (!svcrdma_table_header) 218 return; 219 unregister_sysctl_table(svcrdma_table_header); 220 svcrdma_table_header = NULL; 221 222 percpu_counter_destroy(&svcrdma_stat_write); 223 percpu_counter_destroy(&svcrdma_stat_sq_starve); 224 percpu_counter_destroy(&svcrdma_stat_recv); 225 percpu_counter_destroy(&svcrdma_stat_read); 226} 227 228static int svc_rdma_proc_init(void) 229{ 230 int rc; 231 232 if (svcrdma_table_header) 233 return 0; 234 235 rc = percpu_counter_init(&svcrdma_stat_read, 0, GFP_KERNEL); 236 if (rc) 237 goto out_err; 238 rc = percpu_counter_init(&svcrdma_stat_recv, 0, GFP_KERNEL); 239 if (rc) 240 goto out_err; 241 rc = percpu_counter_init(&svcrdma_stat_sq_starve, 0, GFP_KERNEL); 242 if (rc) 243 goto out_err; 244 rc = percpu_counter_init(&svcrdma_stat_write, 0, GFP_KERNEL); 245 if (rc) 246 goto out_err; 247 248 svcrdma_table_header = register_sysctl("sunrpc/svc_rdma", 249 svcrdma_parm_table); 250 return 0; 251 252out_err: 253 percpu_counter_destroy(&svcrdma_stat_sq_starve); 254 percpu_counter_destroy(&svcrdma_stat_recv); 255 percpu_counter_destroy(&svcrdma_stat_read); 256 return rc; 257} 258 259struct workqueue_struct *svcrdma_wq; 260 261void svc_rdma_cleanup(void) 262{ 263 svc_unreg_xprt_class(&svc_rdma_class); 264 svc_rdma_proc_cleanup(); 265 if (svcrdma_wq) { 266 struct workqueue_struct *wq = svcrdma_wq; 267 268 svcrdma_wq = NULL; 269 destroy_workqueue(wq); 270 } 271 272 dprintk("SVCRDMA Module Removed, deregister RPC RDMA transport\n"); 273} 274 275int svc_rdma_init(void) 276{ 277 struct workqueue_struct *wq; 278 int rc; 279 280 wq = alloc_workqueue("svcrdma", WQ_UNBOUND, 0); 281 if (!wq) 282 return -ENOMEM; 283 284 rc = svc_rdma_proc_init(); 285 if (rc) { 286 destroy_workqueue(wq); 287 return rc; 288 } 289 290 svcrdma_wq = wq; 291 svc_reg_xprt_class(&svc_rdma_class); 292 293 dprintk("SVCRDMA Module Init, register RPC RDMA transport\n"); 294 dprintk("\tsvcrdma_ord : %d\n", svcrdma_ord); 295 dprintk("\tmax_requests : %u\n", svcrdma_max_requests); 296 dprintk("\tmax_bc_requests : %u\n", svcrdma_max_bc_requests); 297 dprintk("\tmax_inline : %d\n", svcrdma_max_req_size); 298 return 0; 299} 300