1 // SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
3 * Copyright (c) 2015-2018 Oracle. All rights reserved.
4 * Copyright (c) 2005-2006 Network Appliance, Inc. All rights reserved.
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
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
16 * Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
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.
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
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.
41 * Author: Tom Tucker <tom@opengridcomputing.com>
44 #include <linux/slab.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>
52 #define RPCDBG_FACILITY RPCDBG_SVCXPRT
54 /* RPC/RDMA parameters */
55 unsigned int svcrdma_ord = 16; /* historical default */
56 static unsigned int min_ord = 1;
57 static unsigned int max_ord = 255;
58 unsigned int svcrdma_max_requests = RPCRDMA_MAX_REQUESTS;
59 unsigned int svcrdma_max_bc_requests = RPCRDMA_MAX_BC_REQUESTS;
60 static unsigned int min_max_requests = 4;
61 static unsigned int max_max_requests = 16384;
62 unsigned int svcrdma_max_req_size = RPCRDMA_DEF_INLINE_THRESH;
63 static unsigned int min_max_inline = RPCRDMA_DEF_INLINE_THRESH;
64 static unsigned int max_max_inline = RPCRDMA_MAX_INLINE_THRESH;
66 atomic_t rdma_stat_recv;
67 atomic_t rdma_stat_read;
68 atomic_t rdma_stat_write;
69 atomic_t rdma_stat_sq_starve;
70 atomic_t rdma_stat_rq_starve;
71 atomic_t rdma_stat_rq_poll;
72 atomic_t rdma_stat_rq_prod;
73 atomic_t rdma_stat_sq_poll;
74 atomic_t rdma_stat_sq_prod;
76 struct workqueue_struct *svc_rdma_wq;
79 * This function implements reading and resetting an atomic_t stat
80 * variable through read/write to a proc file. Any write to the file
81 * resets the associated statistic to zero. Any read returns it's
84 static int read_reset_stat(struct ctl_table *table, int write,
85 void __user *buffer, size_t *lenp,
88 atomic_t *stat = (atomic_t *)table->data;
97 int len = snprintf(str_buf, 32, "%d\n", atomic_read(stat));
100 len = strlen(str_buf);
108 if (len && copy_to_user(buffer, str_buf, len))
116 static struct ctl_table_header *svcrdma_table_header;
117 static struct ctl_table svcrdma_parm_table[] = {
119 .procname = "max_requests",
120 .data = &svcrdma_max_requests,
121 .maxlen = sizeof(unsigned int),
123 .proc_handler = proc_dointvec_minmax,
124 .extra1 = &min_max_requests,
125 .extra2 = &max_max_requests
128 .procname = "max_req_size",
129 .data = &svcrdma_max_req_size,
130 .maxlen = sizeof(unsigned int),
132 .proc_handler = proc_dointvec_minmax,
133 .extra1 = &min_max_inline,
134 .extra2 = &max_max_inline
137 .procname = "max_outbound_read_requests",
138 .data = &svcrdma_ord,
139 .maxlen = sizeof(unsigned int),
141 .proc_handler = proc_dointvec_minmax,
147 .procname = "rdma_stat_read",
148 .data = &rdma_stat_read,
149 .maxlen = sizeof(atomic_t),
151 .proc_handler = read_reset_stat,
154 .procname = "rdma_stat_recv",
155 .data = &rdma_stat_recv,
156 .maxlen = sizeof(atomic_t),
158 .proc_handler = read_reset_stat,
161 .procname = "rdma_stat_write",
162 .data = &rdma_stat_write,
163 .maxlen = sizeof(atomic_t),
165 .proc_handler = read_reset_stat,
168 .procname = "rdma_stat_sq_starve",
169 .data = &rdma_stat_sq_starve,
170 .maxlen = sizeof(atomic_t),
172 .proc_handler = read_reset_stat,
175 .procname = "rdma_stat_rq_starve",
176 .data = &rdma_stat_rq_starve,
177 .maxlen = sizeof(atomic_t),
179 .proc_handler = read_reset_stat,
182 .procname = "rdma_stat_rq_poll",
183 .data = &rdma_stat_rq_poll,
184 .maxlen = sizeof(atomic_t),
186 .proc_handler = read_reset_stat,
189 .procname = "rdma_stat_rq_prod",
190 .data = &rdma_stat_rq_prod,
191 .maxlen = sizeof(atomic_t),
193 .proc_handler = read_reset_stat,
196 .procname = "rdma_stat_sq_poll",
197 .data = &rdma_stat_sq_poll,
198 .maxlen = sizeof(atomic_t),
200 .proc_handler = read_reset_stat,
203 .procname = "rdma_stat_sq_prod",
204 .data = &rdma_stat_sq_prod,
205 .maxlen = sizeof(atomic_t),
207 .proc_handler = read_reset_stat,
212 static struct ctl_table svcrdma_table[] = {
214 .procname = "svc_rdma",
216 .child = svcrdma_parm_table
221 static struct ctl_table svcrdma_root_table[] = {
223 .procname = "sunrpc",
225 .child = svcrdma_table
230 void svc_rdma_cleanup(void)
232 dprintk("SVCRDMA Module Removed, deregister RPC RDMA transport\n");
233 destroy_workqueue(svc_rdma_wq);
234 if (svcrdma_table_header) {
235 unregister_sysctl_table(svcrdma_table_header);
236 svcrdma_table_header = NULL;
238 svc_unreg_xprt_class(&svc_rdma_class);
241 int svc_rdma_init(void)
243 dprintk("SVCRDMA Module Init, register RPC RDMA transport\n");
244 dprintk("\tsvcrdma_ord : %d\n", svcrdma_ord);
245 dprintk("\tmax_requests : %u\n", svcrdma_max_requests);
246 dprintk("\tmax_bc_requests : %u\n", svcrdma_max_bc_requests);
247 dprintk("\tmax_inline : %d\n", svcrdma_max_req_size);
249 svc_rdma_wq = alloc_workqueue("svc_rdma", 0, 0);
253 if (!svcrdma_table_header)
254 svcrdma_table_header =
255 register_sysctl_table(svcrdma_root_table);
257 /* Register RDMA with the SVC transport switch */
258 svc_reg_xprt_class(&svc_rdma_class);