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 */
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;
65
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;
75
76 /*
77 * This function implements reading and resetting an atomic_t stat
78 * variable through read/write to a proc file. Any write to the file
79 * resets the associated statistic to zero. Any read returns it's
80 * current value.
81 */
read_reset_stat(struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)82 static int read_reset_stat(struct ctl_table *table, int write,
83 void *buffer, size_t *lenp, loff_t *ppos)
84 {
85 atomic_t *stat = (atomic_t *)table->data;
86
87 if (!stat)
88 return -EINVAL;
89
90 if (write)
91 atomic_set(stat, 0);
92 else {
93 char str_buf[32];
94 int len = snprintf(str_buf, 32, "%d\n", atomic_read(stat));
95 if (len >= 32)
96 return -EFAULT;
97 len = strlen(str_buf);
98 if (*ppos > len) {
99 *lenp = 0;
100 return 0;
101 }
102 len -= *ppos;
103 if (len > *lenp)
104 len = *lenp;
105 if (len)
106 memcpy(buffer, str_buf, len);
107 *lenp = len;
108 *ppos += len;
109 }
110 return 0;
111 }
112
113 static struct ctl_table_header *svcrdma_table_header;
114 static struct ctl_table svcrdma_parm_table[] = {
115 {
116 .procname = "max_requests",
117 .data = &svcrdma_max_requests,
118 .maxlen = sizeof(unsigned int),
119 .mode = 0644,
120 .proc_handler = proc_dointvec_minmax,
121 .extra1 = &min_max_requests,
122 .extra2 = &max_max_requests
123 },
124 {
125 .procname = "max_req_size",
126 .data = &svcrdma_max_req_size,
127 .maxlen = sizeof(unsigned int),
128 .mode = 0644,
129 .proc_handler = proc_dointvec_minmax,
130 .extra1 = &min_max_inline,
131 .extra2 = &max_max_inline
132 },
133 {
134 .procname = "max_outbound_read_requests",
135 .data = &svcrdma_ord,
136 .maxlen = sizeof(unsigned int),
137 .mode = 0644,
138 .proc_handler = proc_dointvec_minmax,
139 .extra1 = &min_ord,
140 .extra2 = &max_ord,
141 },
142
143 {
144 .procname = "rdma_stat_read",
145 .data = &rdma_stat_read,
146 .maxlen = sizeof(atomic_t),
147 .mode = 0644,
148 .proc_handler = read_reset_stat,
149 },
150 {
151 .procname = "rdma_stat_recv",
152 .data = &rdma_stat_recv,
153 .maxlen = sizeof(atomic_t),
154 .mode = 0644,
155 .proc_handler = read_reset_stat,
156 },
157 {
158 .procname = "rdma_stat_write",
159 .data = &rdma_stat_write,
160 .maxlen = sizeof(atomic_t),
161 .mode = 0644,
162 .proc_handler = read_reset_stat,
163 },
164 {
165 .procname = "rdma_stat_sq_starve",
166 .data = &rdma_stat_sq_starve,
167 .maxlen = sizeof(atomic_t),
168 .mode = 0644,
169 .proc_handler = read_reset_stat,
170 },
171 {
172 .procname = "rdma_stat_rq_starve",
173 .data = &rdma_stat_rq_starve,
174 .maxlen = sizeof(atomic_t),
175 .mode = 0644,
176 .proc_handler = read_reset_stat,
177 },
178 {
179 .procname = "rdma_stat_rq_poll",
180 .data = &rdma_stat_rq_poll,
181 .maxlen = sizeof(atomic_t),
182 .mode = 0644,
183 .proc_handler = read_reset_stat,
184 },
185 {
186 .procname = "rdma_stat_rq_prod",
187 .data = &rdma_stat_rq_prod,
188 .maxlen = sizeof(atomic_t),
189 .mode = 0644,
190 .proc_handler = read_reset_stat,
191 },
192 {
193 .procname = "rdma_stat_sq_poll",
194 .data = &rdma_stat_sq_poll,
195 .maxlen = sizeof(atomic_t),
196 .mode = 0644,
197 .proc_handler = read_reset_stat,
198 },
199 {
200 .procname = "rdma_stat_sq_prod",
201 .data = &rdma_stat_sq_prod,
202 .maxlen = sizeof(atomic_t),
203 .mode = 0644,
204 .proc_handler = read_reset_stat,
205 },
206 { },
207 };
208
209 static struct ctl_table svcrdma_table[] = {
210 {
211 .procname = "svc_rdma",
212 .mode = 0555,
213 .child = svcrdma_parm_table
214 },
215 { },
216 };
217
218 static struct ctl_table svcrdma_root_table[] = {
219 {
220 .procname = "sunrpc",
221 .mode = 0555,
222 .child = svcrdma_table
223 },
224 { },
225 };
226
svc_rdma_cleanup(void)227 void svc_rdma_cleanup(void)
228 {
229 dprintk("SVCRDMA Module Removed, deregister RPC RDMA transport\n");
230 if (svcrdma_table_header) {
231 unregister_sysctl_table(svcrdma_table_header);
232 svcrdma_table_header = NULL;
233 }
234 svc_unreg_xprt_class(&svc_rdma_class);
235 }
236
svc_rdma_init(void)237 int svc_rdma_init(void)
238 {
239 dprintk("SVCRDMA Module Init, register RPC RDMA transport\n");
240 dprintk("\tsvcrdma_ord : %d\n", svcrdma_ord);
241 dprintk("\tmax_requests : %u\n", svcrdma_max_requests);
242 dprintk("\tmax_bc_requests : %u\n", svcrdma_max_bc_requests);
243 dprintk("\tmax_inline : %d\n", svcrdma_max_req_size);
244
245 if (!svcrdma_table_header)
246 svcrdma_table_header =
247 register_sysctl_table(svcrdma_root_table);
248
249 /* Register RDMA with the SVC transport switch */
250 svc_reg_xprt_class(&svc_rdma_class);
251 return 0;
252 }
253
