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(const 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(fbc: stat, amount: 0);
86 return 0;
87 }
88
89 len = snprintf(buf: tmp, size: SVCRDMA_COUNTER_BUFSIZ, fmt: "%lld\n",
90 percpu_counter_sum_positive(fbc: 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
214static void svc_rdma_proc_cleanup(void)
215{
216 if (!svcrdma_table_header)
217 return;
218 unregister_sysctl_table(table: svcrdma_table_header);
219 svcrdma_table_header = NULL;
220
221 percpu_counter_destroy(fbc: &svcrdma_stat_write);
222 percpu_counter_destroy(fbc: &svcrdma_stat_sq_starve);
223 percpu_counter_destroy(fbc: &svcrdma_stat_recv);
224 percpu_counter_destroy(fbc: &svcrdma_stat_read);
225}
226
227static int svc_rdma_proc_init(void)
228{
229 int rc;
230
231 if (svcrdma_table_header)
232 return 0;
233
234 rc = percpu_counter_init(&svcrdma_stat_read, 0, GFP_KERNEL);
235 if (rc)
236 goto err;
237 rc = percpu_counter_init(&svcrdma_stat_recv, 0, GFP_KERNEL);
238 if (rc)
239 goto err_read;
240 rc = percpu_counter_init(&svcrdma_stat_sq_starve, 0, GFP_KERNEL);
241 if (rc)
242 goto err_recv;
243 rc = percpu_counter_init(&svcrdma_stat_write, 0, GFP_KERNEL);
244 if (rc)
245 goto err_sq;
246
247 svcrdma_table_header = register_sysctl("sunrpc/svc_rdma",
248 svcrdma_parm_table);
249 if (!svcrdma_table_header)
250 goto err_write;
251
252 return 0;
253
254err_write:
255 rc = -ENOMEM;
256 percpu_counter_destroy(fbc: &svcrdma_stat_write);
257err_sq:
258 percpu_counter_destroy(fbc: &svcrdma_stat_sq_starve);
259err_recv:
260 percpu_counter_destroy(fbc: &svcrdma_stat_recv);
261err_read:
262 percpu_counter_destroy(fbc: &svcrdma_stat_read);
263err:
264 return rc;
265}
266
267struct workqueue_struct *svcrdma_wq;
268
269void svc_rdma_cleanup(void)
270{
271 svc_unreg_xprt_class(&svc_rdma_class);
272 svc_rdma_proc_cleanup();
273 if (svcrdma_wq) {
274 struct workqueue_struct *wq = svcrdma_wq;
275
276 svcrdma_wq = NULL;
277 destroy_workqueue(wq);
278 }
279
280 dprintk("SVCRDMA Module Removed, deregister RPC RDMA transport\n");
281}
282
283int svc_rdma_init(void)
284{
285 struct workqueue_struct *wq;
286 int rc;
287
288 wq = alloc_workqueue("svcrdma", WQ_UNBOUND, 0);
289 if (!wq)
290 return -ENOMEM;
291
292 rc = svc_rdma_proc_init();
293 if (rc) {
294 destroy_workqueue(wq);
295 return rc;
296 }
297
298 svcrdma_wq = wq;
299 svc_reg_xprt_class(&svc_rdma_class);
300
301 dprintk("SVCRDMA Module Init, register RPC RDMA transport\n");
302 dprintk("\tsvcrdma_ord : %d\n", svcrdma_ord);
303 dprintk("\tmax_requests : %u\n", svcrdma_max_requests);
304 dprintk("\tmax_bc_requests : %u\n", svcrdma_max_bc_requests);
305 dprintk("\tmax_inline : %d\n", svcrdma_max_req_size);
306 return 0;
307}
308

source code of linux/net/sunrpc/xprtrdma/svc_rdma.c